EVA is a kind of plastic material (E) and ethylene vinyl acetate (VA). These two chemicals ratio can be adjusted so as to meet different application needs, higher content of vinyl acetate (VA) content, its transparency, softness and toughness will increase.
The characteristics of EVA and PEVA are:
1, biodegradable: discarded or burned without damage to the environment.
2, and PVC prices are similar: the price of EVA is more expensive than the toxic PVC, but relatively does not contain the PVC of phthalate two is cheap.
3, the weight is light: the density of EVA is between 0.91 and 0.93, while the PVC is 1.32.
4, no odor: EVA does not contain like ammonia (ammonia) or other organic smell.
5, does not contain heavy metal: in line with the relevant international toy regulations (Part EN-71 3 and ASTM-F963).
6, does not contain adjacent benzene two formic acid salt: suitable for children's toys and will not produce plasticizer from danger.
7, high transparent, soft and tough: the scope of application is very broad.
8, super low temperature (-70C): suitable for icing environment.
9, water resistance, salt and other substances: application in a can.
10, high fever: can be firmly affixed to nylon, polyester, canvas and other fabrics.
11, low bonding temperature: can speed up the production rate. Keep stable.
12, can be silk screen printing and offset printing: can be used for more beautiful products (but must use EVA type of ink).
Main use:
(1) foam material is material application field of EVA resin in China the most important.
In the use of EVA resin material, the vinyl acetate content in 15% ~ 22%.
Because of the soft, elastic, chemical resistance and other properties of EVA resin blend foam products, it is widely used in the middle and top grade tourism shoes, mountaineering shoes, slippers, sandals, shoes and the interior materials.
In addition, the material is also used in the field of sound insulation board, gymnastic mat and sealing material.
(1) EVA also can be used in the production of packaging film, medical film, laminated film, cast film.
(2) with the development of computer and network engineering, more and more people are using non halogen flame retardant cable and silane crosslinking cable, for the safety of computer room.
As the EVA resin has good filler compatibility and compatibility, so it is widely used in halogen free flame retardant cable, semi conductor shielded cable and two step silane crosslinking cable.
In addition, EVA resin is also used in the production of some special cable sheath. In the wire and cable in the use of EVA resin, vinyl acetate content in general in 12% ~ 24%. 1999, wire and cable industry consumes about 6000 t EVA.
(3) EVA resin toys also have many applications in toys, such as children's wheel, seat cushion.
(4) hot melt adhesive with EVA resin as the main component of the hot melt adhesive, because it does not contain solvents, does not pollute the environment and the safety is high, very suitable for automated assembly line production. So it is widely used in book binding wireless, furniture edge banding, cars and household appliances assembly, shoes, carpet coating and metal anticorrosion coating. The main use of hot melt adhesive vinyl acetate content in 25% ~ 40% varieties. Although there is this brand of products, but not for a long time to arrange production, so all of the imported materials. In 1999, China's consumption of hot melt adhesive field estimation EVA resin 17 kt.
(5) other EVA resins are widely used in the fields such as ink, bags, bottle cap, and so on. It is estimated that the consumption of EVA resin is not less than 15 kt.