Name: Ethylene - copolymer of acetic acid ethylene
English name: Ethylene-vinyl Acetate Copolymer
English alias: Poly(ethylene-co-vinyl Acetate)
Ethylene - EVA of abbreviation of copolymer of acetic acid ethylene, ethylene of general acetic acid (VA) content is in 5% ～ 40% . Compare with polyethylene photograph, because EVA introduced monomer of acetic acid ethylene in molecular catenary, reduced tall crystallization to spend thereby, raised sex of dissolve of photograph of flexibility, impact resistance, filling and hot sealing can, be applied extensively at the domain such as cable of glue of the film of canopy of sex of epispastic shoe makings, function, film that pack, hot frit, wire and toy.
Generally speaking, EVA resinous function basically depends on the content of ethylene of the acetic acid on molecular catenary. Consumption of market of resinous of our country EVA was 290 Kt about 2001. As the addition of the development of industry of our country shoemaking and dosage of functional canopy film, our country still increases year after year to EVA resinous demand.
(Material of 1) epispastic shoe
Shoe material is the applied field with the mainest colophony of our country EVA. In the EVA resin that uses in shoe material, content of acetic acid ethylene is in commonly 15% ～ 22% . Because EVA colophony mixes epispastic goods to have soft, flexibility in all good, be able to bear or endure chemistry is corroded wait for function, because this is applied extensively,the sole of shoe of travel of Yu Zhonggao archives, climbing boot, slipper, sandal is mixed in interior trim material. Additional, this kind of material still is used at sound insulation board, gymnastic mat and sealed material domain. The suitable heart of our country Guangdong, Zhongshan, the main production base that the Wen Zhou of city of the Jin Jiang of Fujian, spring and Zhejiang is line of business of our country shoe, consume many EVA colophony product every year. Material of our country epispastic shoe and damping domain used up EVA colophony to make an appointment with 150 Kt in all 1999.
(2) film
The main use of EVA film is film of canopy of manufacturing function sex. Film of functional sex canopy is had taller be able to bear or endure await, defend droplet and heat preservation performance, because polyethylene does not have polarity, although add what measure certainly to prevent droplet agent, its prevent droplet function to also can maintain 2 months left and right sides only; And the canopy film that adds colophony of certain amount EVA to be made, have taller light transmittance not only, and prevent droplet function to also have bigger rise, can exceed 4 months commonly. Additional, EVA still can be used at production to pack film, medical film, lamination film, cast film to wait.
1999, our country uses EVA colophony to machine filmy enterprise to have more than 50. 1999, our country accrete produces canopy film 800 Kt, among them 220 Kt of film of functional sex canopy, use up left and right sides of EVA colophony 30 Kt, plus the film that pack, medical the domain such as film, our country uses up EVA colophony 37 Kt in all in filmy domain.
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