Views:756 Author:Site Editor Publish Time: 2021-05-13 Origin:Site
EVA hot melt adhesive is a solvent-free, moisture-free, 100% solid meltable polymer. It is a solid at room temperature, and it is heated and melted to a certain extent to become a fluid and viscous liquid adhesive. Agent, after melting, it will be light brown translucent body or natural white. The main component of the hot melt adhesive, that is, the basic resin is copolymerized with ethylene and vinyl acetate under high pressure, and then mixed with tackifiers, viscosity regulators, antioxidants, etc. to make hot melt adhesives.
EVA is a plastic material composed of ethylene (E) and vinyl acetate (VA). The ratio of these two chemicals can be adjusted to meet the needs of different applications. The higher the content of VA content, the higher the transparency, softness and toughness. Ethylene/Vinyl Acetate Copolymer (EVA)
Ethylene-vinyl acetate copolymer (also known as ethylene-vinyl acetate copolymer) is made by copolymerizing ethylene (E) and vinyl acetate (VA). The English name is; Ethylene Viny Acetate, abbreviated as EVA, or E/ VAC. The polymerization method uses high-pressure bulk polymerization (for plastics) and solution polymerization (PVC processing aids). Emulsion polymerization (adhesive), suspension polymerization. Emulsion polymerization is used when the content of vinyl acetate (VA) is higher than 30%, and high-pressure bulk polymerization is used when the content of vinyl acetate is low. EVA has a wide range of uses. Under normal circumstances, the main products of EVA with vinyl acetate content of less than 5% are films, wire and cable LDPE modifiers, adhesives, etc.; EVA products with vinyl acetate content of 5%-10% are elastic films, etc.; vinyl acetate EVA with a content of 20%-28% is mainly used for hot melt adhesives and coating products; vinyl acetate is 5%-45%, and the main products are films (including agricultural films) and sheets, injection molding and molding products , Foam products, hot melt adhesives, etc. It is widely used in foaming shoe materials, functional shed films, packaging molds, hot melt adhesives, wires and cables, toys and other fields.
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