What is VAE latex powder?
Release Time:
2016-08-15
Source:
What is VAE latex powder?
Chinese name of chemical: Ethylene-Vinyl Acetate Copolymer
Chemical English name: ethylene-vinyl acetate copolymer
English abbreviation: EVA
Technical Manual Code: 1314
CAS No.: 24937-78-8
Molecular formula: (C2H4)x.(C4H6O2)y
Molecular weight: 2000 (average)
EVA classification: Ethylene–vinyl acetate copolymer is the most important product among ethylene copolymers and is generally referred to as EVA internationally. However, in China, based on the varying vinyl acetate content, ethylene–vinyl acetate copolymers are categorized into EVA resin, EVA rubber, and VAE emulsion. Products with a vinyl acetate content of less than 40% are classified as EVA resin; those with a vinyl acetate content of 40% to 70% exhibit high flexibility and elasticity, leading some to refer to this range of EVA resin as EVA rubber; and when the vinyl acetate content falls within the 70% to 95% range, the material typically exists in an emulsified state and is known as VAE emulsion. VAE emulsion has a milky white or slightly yellowish appearance.
Based on the varying VA content, EVA is classified into the following three categories:
⑴ EVA resin: With a vinyl acetate content of no more than 40%, it is synthesized via the high-pressure bulk polymerization process and can be produced using equipment designed for high-pressure polyethylene. The most commonly used grades have vinyl acetate contents of 18% and 28%. Its properties are similar to those of resins, and it is primarily used in plastics and modified materials, suitable for manufacturing injection-molded products, cables, films, and foamed shoe soles, among others.
(2) EVA elastomer: Synthesized via the medium-pressure solution process with a VA content ranging from 40% to 70%. This type of material is soft and exhibits rubber-like elasticity, with low tensile strength but high elongation; it is primarily used as an elastomer, a PVC toughening agent, and in automotive components.
(3) EVA emulsion: With a vinyl acetate content ranging from 70% to 95%, it is synthesized via the emulsion polymerization method and is essentially a modified variant of polyvinyl acetate (PVAC). The product is in emulsion form and is primarily used in adhesives, coatings, and other applications.
