How does polyvinyl alcohol dissolve?
Polyethylene 2113 alcohol is soluble in water. In order to completely dissolve it is necessary to heat 5261 to 65～75℃. Slightly soluble in 4102 dimethyl 1653 sulfoxide. It is soluble in glycerin at 120～150℃, but it becomes jelly when cooled to room temperature.
To dissolve polyvinyl alcohol, the material should be added to room temperature water with stirring. After dispersing evenly, increase the temperature to accelerate the dissolution, which can prevent agglomeration and affect the dissolution rate. The aqueous solution of polyvinyl alcohol (5%) is very sensitive to borax and boric acid, and it is easy to cause gelation. When borax reaches 1% of the solution mass, irreversible gelation will occur.
Chromate, dichromate, and permanganate can also make polyvinyl alcohol gel. The PVA 17-88 aqueous solution gradually increases in viscosity at room temperature with time. However, the viscosity at 8% concentration is absolutely stable, regardless of time. The special phenomenon c polyvinyl alcohol has good film-forming properties and is highly uncomfortable for many gases except water vapor and ammonia.
Good light resistance, not affected by light. It can burn when there is an open fire and has a special smell. When the aqueous solution is stored, it sometimes becomes toxic. Non-toxic, non-irritating to human skin.
Extended data
Polyvinyl alcohol is insoluble in gasoline, kerosene, vegetable oil, benzene, toluene, dichloroethane, carbon tetrachloride, acetone, ethyl acetate, methanol, ethylene glycol, etc. Slightly soluble in dimethyl sulfoxide. 120～l50℃ soluble in glycerin. But when it is cooled to room temperature, it becomes jelly.
Polyvinyl alcohol can be used as an emulsion stabilizer for emulsion polymerization of polyvinyl acetate. Used in the manufacture of water-soluble adhesives. Used as a modifier of starch adhesives. It can also be used to prepare photosensitive adhesive and benzene solvent-resistant sealant. Also used as release agent, dispersant, etc. Store in a cool, dry warehouse. Moistureproof and fireproof.
In addition, it can be used to manufacture polyvinyl acetal, gasoline-resistant pipes and vinylon synthetic fibers, fabric treatment agents, emulsifiers, paper coatings, adhesives, etc.
Reference source: Baidu Encyclopedia-Polyvinyl Alcohol
2 comments
It is estimated that you have never been in the chemical 2113 industry.
Polyvinyl alcohol is a kind of material 4102 which is relatively easy to dissolve in 5261. Mainly depends on the particle size and alcoholysis of your 1653 material. If the alcoholysis degree is 50-70, the cold water dissolves, generally 88, and it can be heated to 80 degrees. The particles are stirred a little longer, and the powder is dissolved when heated to 80 degrees. Cold water feeding can be used. If it is 99, the required temperature is about 85 degrees or the holding time is longer.
We offer patented full biodegradable film and PVA bag, all products are made by casting equipment, It is different from traditional blow molding products, all blow molding products are non full biodegradable. We can produce pva films and bags in full transparent and various colors. and the PVA film is more smooth than the traditional blow molding products.
we also offer organic material full biodegradable film and bags with patented raw material and production Process.
For more PVA film and bags products please visit us:
http://www.joyful-printing.net/pva-bag/
http://www.joyful-printing.com/pva-bag/