Polyvinyl alcohol (088-03)
Key words:
Polyvinyl alcohol
Biodegradable plastic
Forbidden plastic
Technical standards:
Classification:
Product Description
Products to vinyl acetate as the main raw material, the polymerization, alcoholysis and other processes to get a water-soluble environmentally friendly polymer compounds, its chemical name is polyvinyl alcohol resin (PVA), the appearance of white or yellowish flake, granular, powdery solid, the aqueous solution of high viscosity, good initial viscosity, very suitable for building coatings and adhesives production.
Executive standard: Q/OWAL001-2023
Product specification code description
It is also customary to have the following representation
Quality Performance Requirements
|
Specifications |
Project |
|||||
|
Degree of alcoholysis/[% (Mol/mol)] |
Viscosity/(mPa · s) |
Volatile /%,≤ |
pH |
Ash /%,≤ |
Purity /%,≥ |
|
|
100-27 |
≥ 99.0 |
22～31 |
5.0 |
5 to 7 |
0.7 |
93.5 |
|
100-35 |
≥ 99.0 |
32～50 |
5.0 |
5 to 7 |
0.7 |
93.5 |
|
100-60 |
≥ 99.0 |
51～63 |
5.0 |
5 to 7 |
0.7 |
93.5 |
|
100-70 |
≥ 99.0 |
64～73 |
5.0 |
5 to 7 |
0.7 |
93.5 |
|
100-80 |
≥ 99.0 |
74～84 |
5.0 |
5 to 7 |
0.7 |
93.5 |
|
100-88 |
≥ 99.0 |
≥85 |
5.0 |
5 to 7 |
0.7 |
93.5 |
Main characteristics
1 High purity, strong initial adhesion of aqueous solution, good adhesion, high glue rate.
2 The film has good water resistance and excellent film-forming properties.
3. Oil resistance, acid and alkali resistance is good.
4. good storage stability, long time storage does not deteriorate.
5. Good biodegradation performance.
Physical and chemical properties
Formula:-(C2H4O)n-
Specific gravity: 1.26-1.31g/cm3
False specific gravity: 0.47-0.57g/cm3
has good thermal stability
No change occurs below 140 ℃, yellowing begins at 160 ℃, intermolecular dehydration occurs at 170-200 ℃, intramolecular dehydration occurs above 200 ℃, and complete decomposition occurs above 300 ℃.
Easily soluble in water
Aqueous solution has good adhesion, such as fiber, wood paper and other porous materials adhesive performance is very good, but the aqueous solution at low temperature easy gel.
It is easy to form a film, the film is colorless and transparent, has good mechanical strength, the surface is smooth and not sticky, water vapor can pass through the film, but the transmittance of ammonia, oxygen and carbon dioxide is very low, and the influence of external temperature change on the film is small.
good blending
The product can be miscible with starch, gum, synthetic resin, cellulose derivatives and various surfactants with good stability.
Products and their membranes are resistant to most organic solvents such as oils, lubricants and hydrocarbons.
At room temperature, the pH value of the aqueous solution is generally 5-7, and the viscosity is stable. It is hardly affected by weak acids, weak bases or organic solvents (esters, ketones, higher alcohols, hydrocarbons), but it can be degraded by strong oxidants such as peroxides.
With long chain polyol esterification, etherification and acetalization and other chemical properties
The product can be modified to further improve the initial viscosity of the product and the storage stability of the aqueous solution of the product by using the aldol condensation reaction with the aldehyde under acidic conditions, and a variety of adhesives can be prepared.
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Dissolve fast in water, low dissolution temperature. At 88-95 ℃,30-60 minutes time completely dissolved, at the same time do not need special kettle type dissolution equipment for dissolution, easy to use, energy saving.
Dissolve fast in water, low dissolution temperature. At 88-95 ℃,30-60 minutes time completely dissolved, at the same time do not need special kettle type dissolution equipment for dissolution, easy to use, energy saving.
Dissolve fast in water, low dissolution temperature. At 88-95 ℃,30-60 minutes time completely dissolved, at the same time do not need special kettle type dissolution equipment for dissolution, easy to use, energy saving.
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