EVA樹脂是乙烯-醋酸乙（yǐ）烯共（gòng）聚物，一般醋酸乙烯（VA）含量在5%～40%。與聚乙烯相比，EVA由於在分子鏈中引入了醋酸乙（yǐ）烯單體，從而降低了高結晶度，提高了柔韌性、抗衝（chōng）擊性、填料相（xiàng）溶性（xìng）和熱密封性能，被廣泛應用於發泡鞋料、功（gōng）能性棚膜（mó）、包裝膜、熱（rè）熔膠、電線電纜及玩具等領域。一般來說，EVA樹脂的性能主要取決於分（fèn）子鏈上醋（cù）酸乙烯的含量。

發泡鞋材

鞋材是（shì）我國EVA樹脂（zhī）最主要的應用領域。在鞋材使（shǐ）用（yòng）的EVA樹脂中，醋酸乙烯（xī）含量一般在15%～22%。由於EVA樹脂共混發泡製品具有柔軟、彈性好、耐化學腐（fǔ）蝕等（děng）性能，因此被（bèi）廣泛應用於（yú）中高檔旅遊鞋、登山鞋、拖鞋、涼鞋的（de）鞋底和內飾（shì）材料中（zhōng）。另外，這種材料還用（yòng）於隔音板、體操墊和密封材領域。

薄（báo）膜

EVA薄膜的（de）主要用途是（shì）生產功能性棚（péng）膜。功能（néng）性棚膜具有較高的耐候、防霧滴和保溫性能，由於聚乙烯不（bú）具有極性，即使添加一定量的防霧滴劑（jì），其防霧滴性能也隻能維持2個月左右；而添加一定量EVA樹脂製成的棚（péng）膜，不（bú）僅具（jù）有較高的透光率，而且防霧滴性（xìng）能也有較大提（tí）高，一般（bān）可超（chāo）過4個月。另外，EVA還可用（yòng）於生產包裝膜、醫用膜（mó）、層壓膜、鑄（zhù）造膜等。

電線電纜

隨（suí）著計算機（jī）及網絡工程的不（bú）斷發展，出於對機房安全的考慮，人們越來越多地使用無鹵阻燃電纜和（hé）矽烷交聯電纜。由（yóu）於EVA樹脂具有良好的填料（liào）包容性和可交聯性，因此（cǐ）在（zài）無鹵阻燃電纜、半導體（tǐ）屏蔽電纜和二步法矽烷（wán）交（jiāo）聯電纜中使用較多。另外，EVA樹脂還被應用於製作（zuò）一些特殊（shū）電（diàn）纜的護套。在電線電纜中使用的EVA 樹脂，醋酸乙烯含量一般在12%～24%。

EVA resin is ethylene-vinyl acetate copolymer, generally vinyl acetate (VA) content is 5%~40%.Compared with polyethylene, EVA is widely used in foamed shoe materials, functional shed films, packaging films, hot melt adhesives, wires and cables and toys due to the introduction of vinyl acetate monomer in the molecular chain, thereby reducing high crystallinity, improving flexibility, impact resistance, filler compatibility and heat sealing performance.In general, the performance of EVA resin mainly depends on the content of vinyl acetate on the molecular chain.

Foamed shoe material:

Shoe material is the most important application field of EVA resin in China.In the EVA resin used in shoe materials, the content of vinyl acetate is generally 15%~22%.Because EVA resin blended foam products have softness, good elasticity, chemical corrosion resistance and other properties, they are widely used in the sole and interior materials of medium and high-end tourist shoes, hiking shoes, slippers  and sandals.The material is also used in acoustic panels, gymnastics mats and sealants.

Membrane:

The main use of EVA film is the production of functional shed film.Functional shed film has high weather resistance, anti-fog droplet and heat preservation performance, because polyethylene does not have polarity, even if a certain amount of anti-fog drop agent is added, its anti-fog drop 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 greatly improves the anti-fog droplet performance, generally more than 4 months.In addition, EVA can also be used to produce packaging film, medical film, laminated film, casting film, etc.

Wire and cable:

With the continuous development of computer and network engineering, halogen-free flame retardant cables and silane cross-linked cables are increasingly used for the safety of computer rooms.Because EVA resin has good filler inclusiveness and crosslinkability, it is widely used in halogen-free flame retardant cables, semiconductor shielded cables and two-step silane crosslinked cables.In addition, EVA resin is also used to make some special cable sheaths. EVA resin used in wire and cable, vinyl acetate content is generally 12%~24%.

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