PVA-vinyl alcohol

Chinese name: polyvinyl alcohol, ethylene) alcohol polymer, polyvinyl alcohol, referred to as PVA

CAS Number: 9002-89-5

Molecular formula: [C2H4O]n

Properties: PVA and solubility in water, the water temperature has good solubility, but the solubility and solubility cannot be dissolved in high solubility of PVA. The alcohol dissolves completely and the high degree of polymerization PVA dissolves slowly. Formable PVA is easy to be formed into materials, and its mechanical properties are excellent, and the hydrolyzed film of the alcohol-dissolved film increases with the higher degree of polymerization. Generally, the degree of alcoholysis, the stronger the adhesion.

Thermal stability: When the PVA powder is heated to about 100 ℃, the appearance changes. Part of PVA begins to dissolve at around 190°C, and at around 200°C. Complete alcoholysis of PVA occurs at about 230 °C and begins to melt, and decreases rapidly at 240 °C. Low alcohol experiment: the higher the degree of polymerization, the better; the typical degree of solution, the shorter the time.

Can Vinyl Alcohol Uses and Applications and Uses: Polyvinyl alcohol (PVA for short) has a white powder appearance, is a polymer polymer with a wide range of uses, is a polymer, and is in between, its performance is fiber And polymer fibers have non-stick uses. In addition to being used as fiber raw materials, it is widely used in mass production, improvement and use, paper processing agents, food additives, spreading and other films, application scope auxiliaries, pharmaceuticals, textiles, external processing, papermaking, product performance: industrial polyvinyl alcohol External oil and iron and steel products are white solids, branched and powdery in series; non-toxic, odorless, non-polluting, soluble in water at 80--90 °C. The aqueous solution has good adhesion and film-forming properties; it can resist various organic solvents such as oils, lubricants and hydrocarbons; it has long-chain polyacidification, etherification, and acetalization. Product use: mainly warp yarn size, fabric preparation 107 Adhesives, auxiliaries, auxiliaries, adhesives, textile wall acrylates, resins, resins; butylacetonitrile used in the paper industry; agricultural land, shrinkage and synergistic polymers Vinyl alcohol; used in adhesives and high-frequency quenching agents.

How to use: The solubility of different solvent series products of different alcohols can be below 95 ℃, but due to the degree of polymerization, the solubility is different in time, temperature, etc. , it is necessary to deploy and participate in the time of the available convenient side to provide support, in the case of convenient and fast deployment, deployment and dissolution, it is convenient to use the convenient time for deployment and deployment, convenient and fast deployment and dissolution (widely used cold water out of the oven). Do not directly dissolve in water above 0°C. After adding the granular dissolving product (0), the dissolution phenomenon and skin phenomenon will occur in about 4 hours, but dissolve within 9°C and keep the temperature for 2 to 2.5 until the solution no longer contains tiny particles. The stirring speed of the particles is 70 to 1000 rpm, and the time is long. Direct heating methods such as a water bath can be used, and steam heating can be used; however, it cannot be directly heated by an open flame. The solvent that dissolves directly is usually carried out in the direction of the line direction if there is no stirrer when the alcohol is superheated and the operation is carried out. The aqueous solution of the series of glycerol products is 112-14%; the concentration of the aqueous solution of the low-soluble alcohol solvent resin product can generally be around. If the test-like transparency can be dissolved according to the method: 0% dissolved, such as 1 to 2 drops of liquid, such as blue clumps, the color can be evenly distributed. Diffusion, indicating complete dissolution.