PVA powder is used in construction mortar additive, which can improve the mortar flexibility, water-retaining property and cohesiveness. It can reduce mortar friction and increase efficiency and quality. Moreover, it can protect plaster layer from cracking, dropping and enhance the adhesive strength and flatness.
PVA Powder Property and Application
Physical and Chemical Indicators
|
Item |
24－88 |
17－88 |
|
Average degree of polymerization |
2400-2500 |
1700-1800 |
|
Molecular weight
|
118000-124000 |
84000-89000 |
|
Viscosity |
44-50 |
21-26 |
|
Alkalisation degree |
86-89 |
86-89 |
|
Volatile matter content |
＜ 5 |
＜ 5 |
|
Ash content |
＜ 0.5 |
＜ 0.5 |
|
PH |
5-7 |
5-7 |
|
Fineness(mesh) |
＞ 120 |
＞ 120 |
|
Main Applications |
Interior wall putty powder |
Cement additives |
Physical Property
Appearance: white powder, tasteless, with fluidity.
Solubility: PVA powder belongs to alcoholysis type and can be dissolved in room temperature water.
Heat stability: heating can soften PVA. It will no changes below 40℃ and will gradually change color under long heating over 160℃. Above 220℃, it will decompose to be water, acetic acid, ethanal and butenal.
Chemical resistance: almost can not be effected by weak acid, weak base or organic solvent, with high oil resistance.
Stocking stability: PVA is a kind of low viscosity polymer. Its water solution is stable and can not have metamorphism.
Film-forming property: it is easy to film form because of PVA molecules’ high adhesiveness. The thin film is colorless and transparent with great strength, clean and bright surface, not sticky and great dissolution resistance.
Application
PVA powder is used as an additive in construction material, like different putty powder, dry mixed mortar, tile adhesive, gypsum plaster, etc.. It can effectively strengthen the cement and gray mortar adhesion, mobility and reduce the cement drying time. So that it will enhance the adaptation and stop cement coating cracking. It is also fit for whitewashing wall and ceiling and tile adhesiveness. The using way is simple and has great effects.
PVA powder uses composite bag packing with 25kg/bag. During transportation, the tools should be moisture-poof, rainproof, sun-proof and handle with care for protecting from scraping or breaking. PVA powder should put in a dry, ventilated indoor place with 5-30℃. Strictly prohibit stocking with volatile chemicals together to avoid its quality changing.
