| Customization: | Available |
|---|---|
| Feature: | Poly(Vinyl Alcohol) |
| CAS No.: | 9002-89-5 |
|
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|
Item |
PVA17-88 |
|
|
Hydrolysis%(mol/mol) |
87.0-89.0 |
|
|
Viscosity mpa.s |
20.0-26.0 |
|
|
Volatile(%) |
≤ |
5.0 |
|
Ash (%) |
≤ |
0.5 |
|
pH value |
5-7 |
|
|
Purity (%) |
≥ |
93.5 |
|
mesh |
20-200 mesh |
Introduction :Polyvinyl alcohol is a solid that can be in the form of white powder, flakes, or flocs. The glass transition temperature is 60-85 ºC. Polyvinyl alcohol contains many alcohol groups, is polar, and can form hydrogen bonds with water, making it soluble in polar water. Polyvinyl alcohol is also soluble in hot hydroxyl containing solvents such as glycerol and phenol, but insoluble in general organic solvents such as methanol, benzene, acetone, and gasoline. According to the degree of polymerization, it can be classified into ultra-high degree of polymerization (molecular weight 250000 to 300000), high degree of polymerization (molecular weight 170000 to 220000), medium degree of polymerization (molecular weight 120000 to 150000), and low degree of polymerization (molecular weight 25000 to 35000). There are generally three types of alcoholysis degrees: complete alcoholysis (alcoholysis degree 98-100%), partial alcoholysis (alcoholysis degree 87-89%), and alcoholysis degree 78%. In product grades, the thousands and hundreds digits of the degree of polymerization are generally placed at the beginning, followed by the degree of alcoholysis. For example, in chemical books, polyvinyl alcohol 17-99 indicates a degree of polymerization of 1.7k and a degree of alcoholysis of 99%. Polyvinyl alcohol (PVA) is a widely used water-soluble polymer. PVA can quickly dissolve in water to form stable colloids, with properties between plastics and rubber. 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. Its application range covers industries such as textiles, food, medicine, construction, wood processing, papermaking, printing, agriculture, steel, and polymer chemicals. PVA polymer powder is particularly suitable for use as an additive in building mortar. When used in combination with methyl cellulose ether based water retaining agents, it can improve the flexibility, water retention, and bonding properties of cement mortar. In addition, it can also reduce the friction of mortar, thereby enhancing work efficiency and quality.
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