Polyvinyl alcohol (PVA for short) is a white powder in appearance. It is a water-soluble polymer with a wide range of uses. Its performance is between plastic and rubber. Its uses can be divided into two major uses: fiber and non-fiber.

Because PVA has unique strong adhesion, film flexibility, smoothness, oil resistance, solvent resistance, protective colloid, gas barrier, abrasion resistance and water resistance after special treatment, in addition to being used as a fiber raw material, It is also widely used in the production of coatings, adhesives, paper processing agents, emulsifiers, dispersants, films and other products, which are used in textiles, food, medicine, construction, wood processing, paper, printing, agriculture, polymer chemical industry and other industries.

Product performance: The polyvinyl alcohol resin series products are white solid, and the appearance is divided into three types: flocculent, granular and powdery; non-toxic, tasteless, non-polluting, and can be dissolved in water at 80-90 °C. Its aqueous solution has good adhesion and film-forming properties; it is resistant to most organic solvents such as oils, lubricants and hydrocarbons; it has chemical properties such as esterification, etherification, and acetalization of long-chain polyols.

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Product use: mainly used for warp yarn size, fabric finishing agent, vinylon fiber raw material in the textile industry; 107 glue, interior and exterior wall coatings, adhesives in the building and decoration industry; used as a polymer emulsifier, dispersant and polyvinyl alcohol condensation agent in the chemical industry formaldehyde, acetal, butyral resin; used as paper adhesive in paper industry; used as soil conditioner, pesticide adhesion synergist and polyvinyl alcohol film in agriculture; also used in daily cosmetics and high frequency quenching agent, etc.

How to use: The polyvinyl alcohol resin series products can be dissolved in hot water below 95℃, but due to the difference in the degree of polymerization, alcoholysis degree, and alcoholysis methods, there are certain differences in dissolution time and temperature. When using different brands of polyvinyl alcohol resin, the dissolution method and time need to be explored. When dissolving, this product can be slowly added into cold water at about 20℃ while stirring to fully swell, disperse and escape of volatile substances (do not add this product to water above 40℃ for direct dissolution to avoid the occurrence of clumps.) Then the temperature is raised to about 95 °C to accelerate the dissolution, and the temperature is maintained for 2 to 2.5 hours until the solution no longer contains tiny particles. After filtering impurities, it can be used for later use.

The stirring speed is 70~100 rpm. When heating up, indirect heating methods such as water bath can be used, or direct heating with water vapor can be used. However, direct heating cannot be used with an open flame to avoid overheating and decomposition. If there is no mixer, it can be dissolved by blowing steam in a tangential direction.

The aqueous solution concentration of polyvinyl alcohol resin series products is generally below 12~14%; the aqueous solution concentration of low alcoholysis degree polyvinyl alcohol resin products can generally be around 20%.

The method to check whether this product is completely dissolved: take out a small amount of solution, add 1~2 drops of iodine solution, if there is a blue mass transparent body, it means that it has not been completely dissolved, if the color can spread evenly, it means that it has been completely dissolved.

Storage of the solution:

Preservative: If stored for a long time, the water in the aqueous solution will be corrupt, but it will not affect the performance of this product. At this time, 0.01-0.05% (based on PVA) formaldehyde, salicylic acid or other preservatives should be added.

Anti-rust: When storing with iron, a small amount of weak alkali should be added, and when using copper, 0.02-0.05% (based on PVA) sodium nitrite should be added, preferably stainless steel or plastic containers.

Addition of antifoaming agent: When preparing an aqueous solution, this product is not easy to foam, but when the solution concentration is high and the rotation speed is fast, a small amount of foam will also be generated. based on octanol, tributyl phosphate or 0.2-0.5% (based on PVA) silicone emulsion.

Storage and transportation: Store in a ventilated, cool and dry place, away from fire. It should be handled with care during transportation to prevent damage to the package.