Polyvinyl Alcohol (PVA) Comprehensive Product Technical Manual (Polyvinyl Alcohol (PVA) Comprehensive Product Technical Manual ( Building 1788/2488 Series) Building 1788/2488 Series)

1. Basic introduction 1. Basic introduction

Polyvinyl alcohol (PVA) is one of the most widely used and technically mature water-soluble polymers in the world. It belongs to environmentally friendly functional fine chemical materials. Its preparation process is based on vinyl acetate monomer as the basic raw material, through free radical polymerization to generate polyvinyl acetate intermediates, and then through alcoholysis, hydrolysis, refining, crushing and screening and other processes, and finally form a white powder solid finished product. The overall properties of polyvinyl alcohol are stable, non-toxic, tasteless, green and environmentally friendly. It does not belong to flammable and explosive dangerous products. At the same time, it has excellent water solubility, film formation, adhesion and chemical stability. It is an indispensable core auxiliary raw material in the fields of building materials, fine chemicals, textile and papermaking, and daily chemical coatings. Polyvinyl alcohol (PVA) is one of the most widely used and mature water-soluble polymers in the world, and it belongs to environmentally friendly functional fine chemical materials. Its preparation process is based on vinyl acetate monomer as the basic raw material, through free radical polymerization to generate polyvinyl acetate intermediates, and then through alcoholysis, hydrolysis, refining, crushing and screening and other processes, and finally form a white powder solid finished product. The overall properties of polyvinyl alcohol are stable, non-toxic, tasteless, green and environmentally friendly. It does not belong to flammable and explosive dangerous products. At the same time, it has excellent water solubility, film formation, adhesion and chemical stability. It is an indispensable core auxiliary material in the fields of building materials, fine chemicals, textile and papermaking, and daily chemical coatings.

From the perspective of molecular structure, polyvinyl alcohol belongs to a linear polymer with uniform distribution on the molecular chain. From the perspective of molecular structure, polyvinyl alcohol belongs to a linear polymer with uniform distribution of hydrophilic hydroxyl (-OH) hydrophilic hydroxyl (-OH) and hydrophobic ester group hydrophobic ester group on the molecular chain. This amphiphilic structure endows it with unique interfacial activity, making it have multiple functions of emulsification, dispersion, suspension, thickening, film formation, and bonding. It can not only be used as a polymer protective colloid for emulsion polymerization production, but also as a functional additive to improve the comprehensive properties of powder building materials. Compared with traditional chemical additives, PVA has no free formaldehyde and no heavy metal residues. It is suitable for the current industry development trend of green building materials and environmentally friendly coatings, and has outstanding compliance and safety advantages. Two functional groups, this dual-parent structure gives it unique interfacial activity, making it have multiple functions of emulsification, dispersion, suspension, thickening, film formation and bonding. It can not only be used as a polymer protective colloid for emulsion polymerization production, but also as a functional additive to improve the comprehensive performance of powder building materials. Compared with traditional chemical additives, PVA has no free formaldehyde and no heavy metal residues. It is suitable for the current industry development trend of green building materials and environmentally friendly coatings, and has outstanding compliance and safety advantages.

In the field of building dry powder building materials subdivision, polyvinyl alcohol powder in the field of building dry powder building materials subdivision, the mesh fineness and model specification of polyvinyl alcohol powder mesh fineness and model specification are the core selection indicators that determine the construction effect and finished product performance. The industry has formed a standardized selection specification to adapt to the differentiated needs of different construction scenarios. Among them is the core selection index that determines the construction effect and finished product performance. The industry has formed a standardized selection specification to adapt to the differentiated needs of different construction scenarios. Among them, 80-120 mesh 80-120 mesh coarse and medium-fineness powder has strong pore adaptability and moderate dispersion speed. It is specially used for thick-layer dry powder systems such as various types of thermal insulation mortars, masonry mortars, leveling mortars, and tile bonding mortars. The fineness powder is not easy to agglomerate during dry mixing and mixing, and can be evenly dispersed in sand, gravel, and cement powder. It dissolves slowly after encountering water, and gradually exerts the functions of bonding, toughening, and water retention. It is perfectly suitable for the working conditions of high-strength and thick coating of mortars. Coarse and medium-fineness powder, with strong pore adaptability and moderate dispersion speed, is specially used for thick-layer dry powder systems such as various thermal insulation mortars, masonry mortars, leveling mortars, and ceramic tile bonding mortars. The fineness powder is not easy to agglomerate during dry mixing and mixing, and can be evenly dispersed in sand, gravel, and cement powder. It dissolves slowly after encountering water, and gradually exerts the functions of bonding, toughening, and water retention. It is perfectly adapted to the working conditions of high-strength and thick-coating mortars.

The inner and outer wall putty powder belongs to a thin-layer fine coating system, which requires extremely high surface flatness, fineness and abrasiveness. It must be selected. The inner and outer wall putty powder belongs to a thin-layer fine coating system, which requires extremely high surface flatness, fineness and abrasiveness. It must be selected 120 mesh or more high uniformity ultra-fine powder 120 mesh or more high uniformity ultra-fine powder . If the fineness is insufficient and the particles are uneven, it is easy to cause fine particles and sand spots on the surface after the putty batch scraping, and there are concave and convex defects after grinding, which will affect the coating effect of the topcoat. At the same time, it will cause insufficient local dissolution, uneven bonding force, and cracking of the paint film. Therefore, the requirements of PVA powder for putty for powder uniformity, no impurities, and no coarse particles are much higher than those of ordinary mortar materials... If the fineness is insufficient and the particles are uneven, it is easy to cause fine particles and sand spots on the surface of the putty batch after scraping, and there are concave and convex defects after grinding, which affects the coating effect of the topcoat. At the same time, it will cause quality problems such as insufficient local dissolution, uneven bonding force, and peeling and cracking of the paint film. Therefore, the requirements of PVA powder for putty for powder uniformity, no impurities, and no coarse particles are much higher than those of ordinary mortar materials.

The current mainstream application models in the field of building materials are 1788 type 1788 type and 2488 type 2488 type two systems, the alcoholysis of the two is the same (86% - 90%), both are cold water instant modified polyvinyl alcohol, suitable for dry powder building materials dry mixing production process, but the performance and cost performance are significantly different. Among them, the 2488 model has higher polymerization degree, longer molecular chain, significantly higher solution viscosity, and better film-forming toughness and bonding strength, but the raw material cost is expensive, and it is only suitable for niche high-end scenarios such as high-end special building materials, high-toughness coatings, and precision adhesives. The 1788 model has moderate viscosity, good fluidity, light construction feel, and high cost performance. It can fully meet the production and use needs of most mortars, putties, and ordinary adhesives. It is the general main model in the field of civil building materials. It is also the PVA specification with the highest market penetration and the strongest practicability. The two systems have the same alcoholysis degree (86% -90%), both of which are cold water instant modified polyvinyl alcohol, suitable for dry powder building materials dry mixing production process, but the performance and cost performance are significantly different. Among them, the 2488 model has higher polymerization degree, longer molecular chain, significantly higher solution viscosity, and better film-forming toughness and bonding strength, but the raw material cost is expensive, and it is only suitable for niche high-end scenarios such as high-end special building materials, high-toughness coatings, and precision adhesives. The 1788 model has moderate viscosity, good fluidity, light construction feel, and high cost performance. It can fully meet the production and use needs of most mortars, putty, and ordinary adhesives. It is a general-purpose main model in the field of civil building materials. It is also the PVA specification with the highest market penetration and the strongest practicality.

2. Core physical and chemical properties (physical + chemical depth analysis) 2. Core physical and chemical properties (physical + chemical depth analysis)

2.1 Physical Properties 2.1 Physical Properties

(1) Solubility (1) Solubility : The polyvinyl alcohol 88 series (1788/2488) is typical: The polyvinyl alcohol 88 series (1788/2488) is a typical cold water instant type cold water instant type product, which can be quickly dispersed and dissolved in a room temperature water environment without high temperature boiling. It is suitable for the process requirements of dry powder building materials on-site mixing with water and factory automation dry mixing production. Unlike the 99 series complete alcoholysis PVA (which requires high temperature hot water to dissolve), the 88 series effectively reduces the dissolution threshold due to the retention of an appropriate amount of hydrophobic ester groups. After dissolving, a uniform, stable and transparent polymer colloidal solution can be formed, without flocculent precipitation, layered agglomeration, colloidal stability is extremely strong, and it is not easy to break the emulsion and fail when left standing for a long time. At the same time, PVA is insoluble in organic solvents such as ethanol, acetone, and grease, and has strong solvent selectivity. It is suitable for various aqueous system formulations. The product can be quickly dispersed and dissolved in a room temperature water environment without high temperature boiling. It is suitable for the process requirements of dry powder building materials on-site mixing with water and factory automation dry mixing production. Unlike the 99 series fully alcoholyzed PVA (which requires high temperature hot water to dissolve), the 88 series effectively reduces the dissolution threshold due to the retention of an appropriate amount of hydrophobic ester groups. After dissolving, a uniform, stable and transparent polymer colloidal solution can be formed, without flocculent precipitation, layered agglomeration, colloidal stability is extremely strong, and it is not easy to break the emulsion and fail when left standing for a long time. At the same time, PVA is insoluble in organic solvents such as ethanol, acetone, and grease, and has strong solvent selectivity. It is suitable for various aqueous system formulations.

(2) Thermal stability (2) Thermal stability : Polyvinyl alcohol has excellent room temperature stability and controllable high temperature pyrolysis characteristics, with a clear temperature tolerance range. In a room temperature environment of 40 ° C and below, the molecular structure is stable, the appearance, performance, and viscosity do not change significantly, and long-term storage is not easy to deteriorate; when the temperature rises to the range of 100-150 ° C, the colloidal water evaporates rapidly, and gradually forms a tough transparent film. The strength of the film increases steadily with drying and curing; when the temperature exceeds 160 ° C and continues to heat for a long time, the molecular chain gradually oxidizes and discolours, and the product slightly yellows; when the temperature reaches above 220 ° C, the polyvinyl alcohol undergoes complete thermal decomposition. The decomposition products are mainly harmless small molecule substances such as water, acetic acid, acetaldehyde, and butenal. There is no generation of toxic and harmful residual gases. The thermal decomposition is environmentally friendly and safe, and meets the environmental protection testing standards for building materials.: Polyvinyl alcohol has excellent room temperature stability and controllable high temperature pyrolysis characteristics, and the temperature tolerance range is clear. In a room temperature environment of 40 ° C and below, the molecular structure is stable, the appearance, performance, and viscosity do not change significantly, and long-term storage is not easy to deteriorate; when the temperature rises to the range of 100-150 ° C, the colloidal water evaporates rapidly, and gradually forms a tough transparent film. The strength of the film increases steadily with drying and curing; when the temperature exceeds 160 ° C and continues to heat for a long time, the molecular chain gradually oxidizes and discolours, and the product slightly yellows; when the temperature reaches above 220 ° C, the polyvinyl alcohol undergoes complete thermal decomposition, and the decomposition products are mainly harmless small molecule substances such as water, acetic acid, acetaldehyde, and butenaldehyde. There is no toxic and harmful residual gas generation. Thermal decomposition is environmentally friendly and safe, and meets the environmental

(3) Chemical resistance and weather resistance (3) Chemical resistance and weather resistance : PVA polymer structure is compact and stable, and has excellent acid and alkali resistance, solvent resistance, and grease resistance. It is almost immune to the erosion and damage of weak acids, weak bases, and conventional organic solvents at room temperature, and will not dissolve, degrade, and fail. It is suitable for long-term use of cement-based alkaline systems (cement mortar, putty powder). At the same time, it has extremely strong oil resistance, which can resist the corrosion of wall oil and atmospheric pollutants, and effectively improve the anti-aging and anti-pollution properties of finished building materials. In the natural atmospheric environment, PVA film has outstanding weather resistance, is not easy to pulverize, not easy to crack, not easy to fall off, and can maintain stable bonding and protection performance for a long time.: PVA polymer structure is compact and stable, and has excellent acid and alkali resistance, solvent resistance, and grease resistance. It is almost immune to the erosion and damage of weak acid, weak alkali, and conventional organic solvents at room temperature, and will not dissolve, degrade, or fail. It is suitable for long-term use of cement-based alkaline systems (cement mortar, putty powder). At the same time, it has strong oil resistance, which can resist the corrosion of wall oil and atmospheric pollutants, and effectively improve the anti-aging and anti-pollution properties of finished building materials. In the natural atmosphere, PVA film has outstanding weather resistance, is not easy to pulverize, crack, or fall off, and can maintain stable bonding and protective properties for a long time.

(4) Film-forming and mechanical properties (4) Film-forming and mechanical properties : Polyvinyl alcohol is one of the most excellent film-forming properties in polymer materials. After being dissolved and cured in water, it can form a colorless, transparent, uniform, dense, flexible and tough polymer film. The film has extremely high tensile strength, tear resistance, wear resistance, and excellent oxygen barrier, which can effectively isolate air and water vapor penetration and protect the substrate from erosion. The adhesive film has strong adhesion and can closely fit cement, wall, paper, fabric, metal and other substrates. It is suitable for multi-scene applications such as architectural bonding, paint film formation, paper coating, textile sizing, etc.: Polyvinyl alcohol is one of the most excellent film-forming properties in polymer materials. After being dissolved and cured in contact with water, it can form a colorless, transparent, uniform, dense, flexible and tough polymer film. The film has extremely high tensile strength, tear resistance, wear resistance, and excellent oxygen barrier, which can effectively isolate air and water vapor penetration and protect the substrate from erosion. The adhesive film has strong adhesion and can closely fit various substrates such as cement, wall, paper, fabric, metal, etc. It is suitable for multi-scene applications such as architectural bonding, paint film formation, paper coating, and textile sizing.

2.2 Chemical Properties 2.2 Chemical Properties

Polyvinyl alcohol can be defined as polyvinyl alcohol can be defined as Linear polymer with a large number of secondary hydroxyl groups Linear polymer with a large number of secondary hydroxyl groups , the molecular chain is regular, the functional group is evenly distributed, the chemical activity is mild and controllable, no strong oxidation, no strong corrosion, and the chemical properties are stable at room temperature. The hydroxyl groups in the molecule have weak activity and can associate with cement hydration products, cellulose ethers, inorganic fillers, etc., which greatly improves the molecular bonding force within the system and strengthens the bonding strength and overall toughness of building materials., The molecular chain is regular, the functional group is evenly distributed, the chemical activity is mild and controllable, no strong oxidation, no strong corrosion, and the chemical properties are stable at room temperature. The hydroxyl groups in the molecule have weak activity and can associate with cement hydration products, cellulose ethers, inorganic fillers, etc., which greatly improves the molecular bonding force within the system and strengthens the bonding strength and overall toughness of building materials.

At the same time, the hydroxyl group can be crosslinked with an appropriate amount of crosslinking agent and curing agent to further improve the water resistance, compactness and stability of the film; while the small amount of ester group retained in the molecule gives it excellent interfacial activity and emulsifying dispersion ability, which can reduce the surface tension of the system, improve the uniformity of powder dispersion, and avoid agglomeration, delamination and precipitation of dry powder. The overall reaction is mild, no by-products, and no harmful substances are generated, which is suitable for green building materials production standards. At the same time, the hydroxyl group can be crosslinked with an appropriate amount of crosslinking agent and curing agent to further improve the water resistance, compactness and stability of the film; while the small amount of ester groups retained in the molecule endows it with excellent interfacial activity and emulsifying dispersion ability, which can reduce the surface tension of the system, improve the uniformity of powder dispersion, and avoid dry powder agglomeration, delamination and precipitation. The overall reaction is mild, no by-products, and no harmful substances are generated, which is suitable for green building materials production standards.

3. Core technical indicators (1788/2488 dual model comparison) 3. Core technical indicators (1788/2488 dual model comparison)

Polyvinyl alcohol 1788 and 2488 are two mainstream models with the same alcoholysis degree and different polymerization degrees. The alcoholysis degree is unified at 86.0% -90.0%. They belong to the instant series of medium alcoholysis cold water and are suitable for dry powder building materials systems. However, the polymerization degree, molecular weight and viscosity of the two are significantly different, which directly determines the construction feel, finished product performance and applicable scenarios. The following are the industry's general high-standard technical parameters, distinguishing between ordinary grade and high-purity superior product indicators. The data are in line with the measured standards of industrial production, and can be directly used as the basis for procurement, formula debugging, and quality inspection. Polyvinyl alcohols 1788 and 2488 are two mainstream models with the same alcoholysis degree and different polymerization degrees. The alcoholysis degree is unified at 86.0% -90.0%. They belong to the instant series of medium alcoholysis cold water and are suitable for dry powder building materials systems. However, the polymerization degree, molecular weight and viscosity of the two are significantly different, which directly determines the construction feel, finished product performance and applicable scenarios. The following are the industry's general high-standard technical parameters, distinguishing between ordinary grade and high-purity excellent product indicators. The data are in line with the measured standards of industrial production, and can be directly used as the basis for procurement, formulation debugging, and quality inspection.

Inspection Items	PVA 1788 (General Building Grade)	PVA 2488 (High End High Viscosity Grade)
Viscosity (mpa.s, 4% aqueous solution at 20 ° C)	20.0~ 26.5	44~ 50
Alcoholysis [% (mol/mol) ]	86.0~ 90.0	86.0~ 90.0
Volatile matter (%)		7.0	<5.0
Sodium acetate residue (%)	≤ 2.8	≤ 2.8
Ash content (%)		≤ 1.0	<0.5
PH value (aqueous solution)	5~ 7	5~ 7
Degree of polymerization	1650~ 1850	2400~ 2500
Average molecular weight	72600~ 81400	118000~ 124000

Parameter depth analysis: 2488 model relies on higher degree of polymerization and molecular weight, longer molecular chains and tighter entanglements, so the solution viscosity is greatly improved, and the film toughness, tensile strength and cracking resistance are better than 1788, but too high viscosity will lead to large scratch resistance, heavy feel and poor sanding of putty batches, making it unsuitable for large-area thin-layer coating construction. 1788 has moderate viscosity, better dispersion, smooth construction, and controllable ash and volatile matter. It fully meets the performance requirements of ordinary mortar, putty and adhesive, and has significant cost-effectiveness advantages. At the same time, 2488 has lower volatile matter and ash content and higher purity. It is suitable for high-end low-odor, high-clean building materials products. Parameter depth analysis: 2488 model with higher degree of polymerization and molecular weight, longer molecular chain, more tightly entangled, so the solution viscosity is greatly improved, film toughness, tensile strength, anti-cracking performance is better than 1788, but high viscosity will lead to putty batch scraping resistance, heavy feel, poor sanding, not suitable for large-scale thin layer coating construction. And 1788 moderate viscosity, better dispersion, smooth construction, ash and volatile matter controllable, fully meet the performance requirements of ordinary mortar, putty, adhesive, cost-effective advantages. At the same time, 2488 volatile matter, ash content is lower, higher purity, suitable for high-end low-odor, high-clean building materials products.

IV. Core Functions and Mechanisms (Building Materials Field) IV. Core Functions and Mechanisms (Building Materials Field)

As the core functional additive of building dry powder system, polyvinyl alcohol powder is often used in combination with methyl cellulose ether (HPMC, HEMC) water retaining agent. The two form a functional complementary system to optimize the comprehensive performance of cement mortar and putty from multiple dimensions such as water retention, toughening, bonding, crack resistance, and constructability. It is a key additive to improve the quality of finished building materials. Its core function and mechanism are as follows: As the core functional additive of building dry powder system, polyvinyl alcohol powder is often used in combination with methyl cellulose ether (HPMC, HEMC) water retaining agent. The two form a functional complementary system to optimize the comprehensive performance of cement mortar and putty from multiple dimensions such as water retention, toughening, bonding, crack resistance, and constructability. It is a key additive to improve the quality of finished building materials. Its core function and mechanism are as follows:

1. Super bond anchorage 1. Super bond anchorage : PVA forms a highly active polymer colloid after being dissolved in water, which can evenly wrap cement, talc, heavy calcium, quartz sand and other powder particles, and improve the bonding force between the powder and the wall substrate through hydrogen bond adsorption. Effectively solve the common quality problems such as insufficient bonding force of ordinary mortar, wall hollowing, falling off, peeling, etc., and greatly improve the adhesion and bonding strength of ceramic tile binder, wall putty, and leveling mortar.: PVA forms a highly active polymer colloid after being dissolved in water, which can evenly wrap cement, talc, heavy calcium, quartz sand and other powder particles, and improve the bonding force between powders and between powders and wall substrates through hydrogen bond adsorption. Effectively solve the common quality problems such as insufficient bonding force of ordinary mortar, wall hollowing, falling off, and peeling, and greatly improve the adhesion and bonding strength of ceramic tile binder, wall putty, and leveling mortar.

2. Flexible toughening, anti-cracking and anti-seepage effect 2. Flexible toughening, anti-cracking and anti-seepage effect : Pure cement mortar is brittle and easy to dry shrink and crack after curing, while the flexible film formed by PVA curing can be interspersed in the cement hydration hardening skeleton to construct a "rigid cement + flexible polymer" composite structure, which effectively offsets the dry shrinkage stress and temperature stress during the curing process of the mortar, significantly improves the flexibility, crack resistance and deformation resistance of the finished product, avoids fine cracks in the wall and mortar layer, and improves the overall anti-seepage and waterproof performance.: Pure cement mortar is brittle and easy to dry shrink and crack after curing, while the flexible film formed by PVA curing can be interspersed in the cement hydration hardening skeleton to construct a "rigid cement + flexible polymer" composite structure, which effectively offsets the dry shrinkage during the curing process of the mortar Stress and temperature stress can significantly improve the flexibility, crack resistance and deformation resistance of the finished product, avoid subtle cracks in the wall and mortar layer, and improve the overall anti-seepage and waterproof performance.

3. Long-term water retention, optimized hydration reaction 3. Long-term water retention, optimized hydration reaction : When used with cellulose ether, PVA can assist in improving the water retention performance of the system, locking the free moisture inside the mortar, slowing down the rate of moisture volatilization, and ensuring the full hydration reaction of the cement. Avoid the problems of incomplete curing, insufficient strength, sanding and powdering caused by rapid water loss, effectively improve the later strength and durability of the mortar, and adapt to harsh construction environments such as high temperature, dryness, and strong wind.: When used with cellulose ether, PVA can assist in improving the water retention performance of the system, locking the free moisture inside the mortar, slowing down the rate of moisture volatilization, and ensuring the full hydration reaction of the cement. Avoid incomplete curing, insufficient strength, sanding and powdering problems caused by rapid water loss, effectively improve the later strength and durability of the mortar, and adapt to harsh construction environments such as high temperature, dryness, and strong wind.

4. Improve construction workability and reduce frictional resistance 4. Improve construction workability and reduce frictional resistance : PVA colloid has excellent lubrication and dispersion, which can reduce the internal friction between dry powder particles, make mortar and putty easier to mix evenly, batch scraping smooth, smooth application, greatly reduce construction resistance and improve construction efficiency. At the same time, it can reduce system bubbles, improve surface flatness, and make the finished product look more delicate and full.: PVA colloid has excellent lubrication and dispersion, which can reduce the internal friction between dry powder particles, make mortar and putty easier to mix evenly, batch scraping smooth, smooth application, greatly reduce construction resistance and improve construction efficiency. At the same time, it can reduce system bubbles, improve surface flatness, and make the finished product feel more delicate and full.

5. Wear and weather resistance, anti-aging protection 5. Wear and weather resistance, anti-aging protection : PVA film after film formation is dense and wear-resistant, strong barrier, can effectively resist atmospheric oxidation, rain initialization, ultraviolet aging, improve the wear resistance, weather resistance and service life of finished building materials, long-term use is not easy to powder, crack, fall off.: PVA film after film formation is dense and wear-resistant, strong barrier, can effectively resist atmospheric oxidation, rain initialization, ultraviolet aging, improve the wear resistance, weather resistance and service life of finished building materials, long-term use is not easy to powder, crack, fall off.

5. Subdivision uses in all fields 5. Subdivision uses in all fields

Relying on excellent water solubility, film formation, adhesion, emulsification and stability, polyvinyl alcohol is widely used in building materials, fine chemicals, textile and papermaking, daily chemical coatings, electronic printing and other industries, covering the whole scene of industrial production and civil manufacturing. The core sub-uses are as follows: Relying on excellent water solubility, film formation, adhesion, emulsification and stability, polyvinyl alcohol is widely used in building materials, fine chemicals, textile and papermaking, daily chemical coatings, electronic printing and other industries, covering the whole scene of industrial production and civil manufacturing. The core sub-uses are as follows:

1. Core areas of building materials 1. Core areas of building materials : water-resistant putty powder for inner and outer walls, thermal insulation and anti-cracking mortar, bonding mortar, leveling mortar, tile binder, stone binder, thin-layer flexible adhesive, cement-based waterproof additive, interface agent, plugging mortar, dry powder floor materials, etc., are the general core additives for dry powder building materials systems.: water-resistant putty powder for inner and outer walls, thermal insulation and anti-cracking mortar, bonding mortar, leveling mortar, tile binder, stone binder, thin-layer flexible adhesive, cement-based waterproof additive, interface agent, plugging mortar, dry powder floor materials, etc., are the general core additives for dry powder building materials systems.

2. Field of coatings and adhesives 2. Field of coatings and adhesives : Waterborne interior wall coatings, latex paint binders, waterborne primers, PVC latex additives, rewettability adhesives, architectural glues, solid adhesives, industrial dextrins, office pastes for affairs, which can improve coating film formation, adhesion and storage stability.: Waterborne interior wall coatings, latex paint binders, waterborne primers, PVC latex additives, rewettability adhesives, architectural glues, solid adhesives, industrial dextrins, office pastes for affairs, which can improve coating film formation, adhesion and storage stability.

3. Textile and Paper Industry 3. Textile and Paper Industry : Long Fiber Yarn Sizing Agent, Fabric Finishing Agent, Paper Surface Sizing Agent, Coated Paper Coating Adhesive, Paper Reinforcing Agent to Improve Fabric Wear Resistance and Flatness, Enhance Paper Strength, Smoothness and Oil Resistance.: Long Fiber Yarn Sizing Agent, Fabric Finishing Agent, Paper Surface Sizing Agent, Coated Paper Coating Adhesive, Paper Reinforcing Agent to Improve Fabric Wear Resistance and Flatness, Enhance Paper Strength, Smoothness and Oil Resistance.

4. Printing and Photosensitive Materials 4. Printing and Photosensitive Materials : Screen photosensitive film, zinc plate printing photosensitive substrate, printing plate making auxiliary, using its film formation uniformity and strong adhesion characteristics to improve the accuracy and stability of photosensitive materials.: Screen photosensitive film, zinc plate printing photosensitive substrate, printing plate making auxiliary, using its film formation uniformity and strong adhesion characteristics to improve the accuracy and stability of photosensitive materials.

5. Daily chemical and fine chemical 5. Daily chemical and fine chemical : Cosmetic emulsion stabilizer, cream thickening aid, environmentally friendly cleaning raw materials, with non-toxic, mild and stable characteristics, suitable for the safety standards of daily chemical products; at the same time, it can be used as emulsion polymerization protection colloid for VAE, PVAc emulsion production.: Cosmetic emulsion stabilizer, cream thickening aid, environmentally friendly cleaning raw materials, with non-toxic, mild and stable characteristics, suitable for the safety standards of daily chemical products; at the same time, it can be used as emulsion polymerization protection colloid for VAE, PVAc emulsion production.

VI. Standard dosage and scientific ratio specification VI. Standard dosage and scientific ratio specification

In the building dry powder building materials system, polyvinyl alcohol powder is not the higher the amount of addition, the better the performance. Excessive addition will lead to high viscosity, slower curing speed, and higher cost of the system. If the dosage is insufficient, the toughening, bonding, and anti-cracking effects cannot be exerted. The industry standard for dosage is that in the building dry powder building materials system, the higher the amount of polyvinyl alcohol powder is not added, the better the performance. Excessive addition will lead to high viscosity, slower curing speed, and higher cost of the system. If the dosage is insufficient, the toughening, bonding, and anti-cracking effects cannot be exerted. The industry standard is 0.2% - 1.2% of the total mass of the powder mixture 0.2% - 1.2% of the total mass of the powder mixture . The accurate proportions of different scenarios are as follows:, The accurate proportions of different scenarios are as follows:

Ordinary interior wall putty: 0.2% - 0.4% to meet the basic bonding, fineness and abrasion requirements; exterior wall water-resistant putty and high crack-resistant putty: 0.4% - 0.6% to improve water resistance, crack resistance and outdoor weather resistance; ordinary thermal insulation mortar, leveling mortar: 0.3% - 0.5%; tile binder, flexible crack-resistant mortar: 0.6% - 1.0% to strengthen bond strength and flexibility; high-end special flexible building materials: 1.0% - 1.2%. In actual production, the dosage can be fine-tuned according to the formula system, construction environment, and performance requirements to ensure a balance between cost performance and finished product performance. Ordinary interior wall putty: 0.2% - 0.4%, to meet the basic bonding, fineness and abrasion requirements; exterior wall water-resistant putty, high crack-resistant putty: 0.4% - 0.6%, to improve water resistance, crack resistance and outdoor weather resistance; ordinary thermal insulation mortar, leveling mortar: 0.3% - 0.5%; tile binder, flexible crack-resistant mortar: 0.6% - 1.0%, to strengthen bonding strength and flexibility; high-end special flexible building materials: 1.0% - 1.2%. In actual production, the dosage can be fine-tuned according to the formula system, construction environment, and performance requirements to ensure a balance between cost performance and finished product performance.

7. Standardized dissolution and use process 7. Standardized dissolution and use process

Polyvinyl alcohol powder is very easy to agglomerate and agglomerate in contact with water, and directly add water to dissolve the micelles that are prone to external dissolution and internal dryness, which seriously affects the use effect. Therefore, the dry powder system must use polyvinyl alcohol powder, which is very easy to agglomerate and agglomerate in contact with water, and directly add water to dissolve the micelles that are prone to external dissolution and internal dryness, which seriously affects the use effect. Therefore, the dry powder system must adopt the standardized construction process of dry mixing first, then water dissolution first, and then water dissolution , which is the key to ensuring the performance of the product.

1. Dry Mix Dispersion: Fully mix PVA powder with cement, talc, heavy calcium, cellulose ether and other powdery ingredients, dry mix through mechanical stirring for 5-10 minutes, use the friction between the powders to completely disperse the PVA powder, break the fine particle agglomeration state, to ensure uniform mixing of the powder. 1. Dry Mix Dispersion: Fully mix PVA powder with cement, talc, heavy calcium, cellulose ether and other powdery ingredients, dry mix through mechanical stirring for 5-10 minutes, use the friction between the powders to completely disperse the PVA powder, break the fine particle agglomeration state, and ensure uniform mixing of the powder.

2. Add water and stir: After dry mixing, slowly add metered water, continue to stir for 3-5 minutes, let stand for 3-5 minutes, and stir again for 1-2 minutes to form a uniform, agglomerate-free and excellent fluidity slurry. This process can completely avoid PVA agglomeration, ensure that each powder can be fully dissolved, and evenly play the role of bonding, toughening, and water retention. 2. Add water and stir: After dry mixing, slowly add metered water, continue to stir for 3-5 minutes, let stand for 3-5 minutes, and stir again for 1-2 minutes to form a uniform, agglomerate-free and excellent fluidity slurry. This process can completely avoid PVA agglomeration, ensure that each powder can be fully dissolved, and evenly exert the functions of bonding, toughening and water retention.

It should be noted that PVA powder is strictly prohibited from being directly put into water to dissolve, otherwise it will quickly absorb water and clump together, forming hard rubber particles that are difficult to break up, resulting in unequal quality defects of particles, spots and bonds in the finished product. It should be noted that PVA powder is strictly prohibited from being directly put into water to dissolve, otherwise it will quickly absorb water and clump together, forming hard rubber particles that are difficult to break up, resulting in unequal quality defects of particles, spots and bonds in the finished product.

8. Packaging, transportation and warehousing specifications 8. Packaging, transportation and warehousing specifications

1. Standard packaging 1. Standard packaging : Industrial general packaging is 25kg/bag, sealed packaging with thickened paper-plastic composite bag, built-in moisture-proof inner film, dust-proof, moisture-proof, anti-damage, tight and firm packaging, suitable for mass storage and long-distance transportation, in line with chemical building materials general packaging standards.: Industrial general packaging is 25kg/bag, sealed packaging with thickened paper-plastic composite bag, built-in moisture-proof inner film, dust-proof, moisture-proof, anti-damage, tight and firm packaging, suitable for mass storage and long-distance transportation, in line with chemical building materials general packaging standards.

2. Storage conditions 2. Storage conditions : Polyvinyl alcohol powder has strong moisture absorption, and the storage core focuses on moisture-proof, dry, dark, and constant temperature. It needs to be stored in a dry, ventilated and clean indoor warehouse. The ambient temperature is controlled at 5 ° C - 30 ° C to avoid high temperature exposure, low temperature freezing, and wet rain. The warehouse needs to be kept away from water sources, acid and alkali materials, and strong oxidants. The ground should be piled up high to prevent the moisture return on the ground from causing the product to absorb moisture, agglomerate, and deteriorate and fail. When the seal is intact, the shelf life of the product can reach more than 12 months.: Polyvinyl alcohol powder has strong moisture absorption, and the storage core focuses on moisture-proof, dry, dark, and constant temperature. It needs to be stored in a dry, ventilated and clean indoor warehouse with an ambient temperature of 5 ° C to 30 ° C to avoid high temperature exposure, low temperature freezing, and humid rain. The warehouse needs to be kept away from water sources, acid and alkali materials, and strong oxidants, and the ground should be piled up to prevent the product from absorbing moisture, agglomeration, deterioration and failure due to moisture return on the ground. When the seal is intact, the shelf life of the product can reach more than 12 months.

3. Transportation Requirements 3. Transportation Requirements : Rainproof, moisture-proof and damage-proof protection is required during transportation to avoid damage to packaging bags, spilling of materials, and agglomeration by moisture. This product is an ordinary chemical raw material, non-dangerous goods, no flammable, explosive, no corrosive and toxic properties, low transportation threshold, safe and convenient. Avoid heavy pressure and sharp object puncture during transportation and stacking to ensure complete packaging, and put it into storage and sealed storage in time after arrival.: Rainproof, moisture-proof and damage-proof protection is required during transportation to avoid damage to packaging bags, material spilling, and moisture agglomeration. This product is an ordinary chemical raw material, non-dangerous goods, no flammable, explosive, no corrosive and toxic properties, low transportation threshold, safe and convenient. Avoid heavy pressure and sharp objects piercing during transportation and stacking, ensure that the packaging is complete, and put it into storage and sealed in time after arrival.

Nine, 1788 and 2488 model selection summary and industry recommendations Nine, 1788 and 2488 model selection summary and industry recommendations

Comprehensive performance, workability, and cost-effectiveness are three dimensions. In the field of civil building materials, comprehensive performance, workability, and cost-effectiveness are preferred. In the field of civil building materials, 1788-type polyvinyl alcohol 1788-type polyvinyl alcohol is preferred. With ultra-fine uniform powder above 120 mesh, it is suitable for putty, ordinary mortar, and conventional adhesive production. The construction feels light, has good sanding performance, no particle defects, and is very cost-effective. It fully meets the performance requirements of national standard building materials. Type 2488 is only recommended for niche high-end scenarios such as high-end flexible coatings, special waterproof building materials, and high-bonding precision adhesives due to its high viscosity and high cost characteristics. It is not recommended to use civilian general materials in large quantities to avoid problems such as cost waste and poor construction feel. At the same time, it strictly follows the fineness selection standard of "80-120 mesh for mortar and 120 mesh for putty", which can avoid most wall construction quality problems from the raw material side and ensure the stable quality of finished products., with ultra-fine uniform powder above 120 mesh, it is suitable for putty, ordinary mortar, and conventional adhesive production. The construction feels light, has good sanding performance, no particle defects, and is very cost-effective. It fully meets the performance requirements of national standard building materials. Due to its high viscosity and high cost characteristics, Type 2488 is only recommended for niche and high-end scenarios such as high-end flexible coatings, special waterproof building materials, and high-bonding precision adhesives. It is not recommended to use civilian general materials in large quantities to avoid cost waste and poor construction feel. At the same time, it strictly follows the fineness selection standard of "80-120 mesh for mortar and 120 mesh for putty", which can avoid most wall construction quality problems from the raw material side and ensure the stable quality of finished products.

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