EVA is plastic raw material, the English abbreviation: EVA, refers to the ethylene/vinyl acetate copolymer.
The main purpose
EVA resin is vinyl - vinyl acetate copolymer, the general vinyl acetate (VA) content in 5% ~ 40%.Compared with polyethylene, EVA due to the introduction of vinyl acetate monomer in the molecular chain, which reduces the high crystallinity, improve the flexibility, impact resistance, heat intermiscibility of filling and sealing performance, are widely used in foaming shoe materials, functional films, packaging film, hot melt adhesive, wire and cable and toys, and other fields.Generally speaking, the performance of EVA resin depends on the content of vinyl acetate on the molecular chain.
(1) blister material
Eva sole material is the main application field of EVA resin in China.In the EVA resin used in Eva molded insoles, the content of vinyl acetate is generally between 15% and 22%.Because the EVA resin blend foam products has soft, good elasticity, resistance to chemical corrosion, such as performance, therefore they are widely used in high-grade sports shoes, mountaineering shoes, slippers, sandals, sole and Eva rubber sole.
(2) thin film
The main purpose of EVA film is to produce functional membrane.Functional films with high weather resistance, prevent droplets and heat preservation performance, because of polyethylene has no polarity, even add a certain amount of droplets remover, the droplets prevention performance also can only be maintained for 2 months or so;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 performance of anti-fog drops, which can generally exceed 4 months.In addition, EVA can also be used to produce packaging film, medical film, laminated film, casting film, etc.
(3) wire and cable
With the continuous development of computer and network engineering, more and more halogen-free flame-retardant cables and silane crosslinking cables are used for the safety of machine rooms.Because EVA resin has good packing tolerance and crosslinking property, it is widely used in halogen-free flame-retardant cable, semiconductor shielding cable and two-step silane crosslinking cable.
(4) hot melt adhesive
EVA resin as the main ingredient of hot melt adhesive, because do not contain solvents, no pollution and high security, is very suitable for automated assembly line production, therefore they are widely used in wireless binding books, furniture edge banding, cars and home appliances assembly, shoemaking, carpets coating and metal anticorrosion coating.