EVA Resin is an ethylene-vinyl acetate copolymer, and the general vinyl acetate (VA) content is 5% to 40%. Compared with polyethylene, EVA is widely used in foam shoes due to the introduction of vinyl acetate monomer into the molecular chain, which reduces high crystallinity and improves flexibility, impact resistance, filler compatibility and heat sealing performance. Materials, functional shed film, packaging film, hot melt adhesive, wire and cable and toys and other fields. Generally speaking, the performance of EVA resin mainly depends on the content of vinyl acetate on the molecular chain.
Main purpose:
1. It is widely used in the fields of foamed shoe materials, functional shed films, packaging molds, hot melt adhesives, wires and cables and toys.
2. EVA products with vinyl acetate content of 5% ~ 10% are elastic films;
3. EVA with vinyl acetate content of 20-28% is mainly used for hot melt adhesive and coating products;
4. The content of vinyl acetate is 5% ~ 45%, and the main products are films (including agricultural films) and sheets, injection molding, molding products, foaming products, hot-melt adhesives, etc.
(1) Foamed shoe material. Shoe material is the main application field of EVA resin in China. In the EVA resin used for shoe materials, the content of vinyl acetate is generally 15% ~ 22%. Because EVA resin blended foamed products have soft, good elasticity, chemical corrosion resistance and other properties, they are widely used in the soles and interior materials of middle and high-end travel shoes, mountaineering shoes, slippers and sandals. In addition, this material is also used in the fields of soundproof panels, gymnastic pads and sealing materials.
(2) Film. The main purpose of EVA film is to produce functional greenhouse film. The functional shed film has high weather resistance, anti fogging and thermal insulation performance. Because polyethylene has no polarity, even if a certain amount of anti fogging agent is added, its anti fogging performance can only be maintained for about 2 months; The shed film made by adding a certain amount of EVA resin not only has a high light transmittance, but also has a great improvement in the anti fog drop performance, generally more than 4 months. In addition, EVA can also be used to produce packaging film, medical film, laminated film, casting film, etc.
(3) Wires and cables. With the continuous development of computer and network engineering, halogen-free flame retardant cables and silane crosslinked cables are more and more used for the safety of computer rooms. EVA resin is widely used in halogen-free flame retardant cables, semiconductor shielded cables and two-step silane crosslinked cables due to its good filler inclusion and crosslinkability. In addition, EVA resin is also used to make the sheath of some special cables. The content of EVA resin used in wires and cables is generally 12% ~ 24%.
(4) Toys. EVA resin is also widely used in toys, such as children's wheels and seat cushions.
(5) Hot melt adhesive. The hot melt adhesive with EVA resin as the main component is very suitable for automatic assembly line production because it does not contain solvent, does not pollute the environment and has high safety. Therefore, it is widely used in wireless book binding, furniture edge sealing, automobile and household appliance assembly, shoe making, carpet coating and metal anti-corrosion coating.
(6) Others. EVA resin is also widely used in ink, luggage, wine bottle cushion cover and other fields. It is estimated that the consumption of EVA resin in these areas is not less than 15 kt.
