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Polyvinyl Alcohol(PVA)-1788/2488

Polyvinyl alcohol (PVA) is made by alcoholysis and polymerization of vinyl acetate. It is a white, powdery, stable, and non-toxic water-soluble polymer that can quickly dissolve in room temperature water to form stable colloids. Water is a good solvent for polyvinyl alcohol. Polyvinyl alcohol has good film-forming properties, forming films with excellent adhesion, solvent resistance, friction resistance, tensile strength, and oxygen barrier properties. Polyvinyl alcohol has both hydrophilic and hydrophobic functional groups, making it a substance with interfacial activity. Therefore, polyvinyl alcohol can be used as a protective colloid during polymer emulsification and suspension polymerization reactions.

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Polyvinyl Alcohol(PVA)-2488

PVA

Physical properties

A. Solubility: Polyvinyl alcohol powder can dissolve in water at room temperature.

B, Thermal stability: Polyvinyl alcohol softens when heated and does not show significant changes below 40 ℃. Over 160 ℃, it gradually colors after prolonged heating, and decomposes above 220 ℃ to produce water, acetic acid, acetaldehyde, and butenal.

C, Chemical resistance: PVA is almost unaffected by weak acids, weak bases, or organic solvents, and has high oil resistance.

D, Film forming property: PVA is easy to form a film, and the resulting thin film is colorless and transparent, with good mechanical strength,

2. Chemical properties: PVA can be regarded as a linear polymer with secondary hydroxyl groups.

Technical indicators

Specification	17-88	24-88
Viscosity (mpa. s)	20.0~26.5	44-50
Acid hydrolysis degree [% (mol/mol)]	86.0-90.0	86.0-90.0
Volatile matter (%)	≤ 7.0	≤ 7.0
Sodium acetate (%)	1.8	1.8
Ash content (%)	0.7	0.7
PH value	5-7	5-7
Aggregation degree	1650-1850	2400-2500
Molecular weight	72600~81400	118000-124000

In the field of mortar application, polyvinyl alcohol powder with a fineness of 80-120 mesh can be used, while in the field of putty, uniform powder with a fineness of over 120 mesh must be used. 2488 has a high viscosity, but the price is relatively expensive. Generally, the 1788 model can fully meet the needs.

main function

PVA polymer powder is particularly suitable as an additive for 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.

Suggested dosage: 0.2-1.2% of the total amount of the mixture

Dissolution method: Mix polyvinyl alcohol powder with other powdered ingredients through dry mixing to fully disperse, and then dissolve in water

Packaging, transportation, and storage: 25kg/bag, packaged in paper plastic composite bags. Store in a dry, well ventilated room at a temperature of 5-30 ℃.

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