EVA resin is an ethylene-vinyl acetate copolymer, and the content of vinyl acetate (VA) is generally 5% to 40%. Compared with polyethylene, EVA has introduced vinyl acetate monomer in the molecular chain, thereby reducing the high crystallinity of EVA foam, improving flexibility, impact resistance, filler compatibility and heat sealing performance. EVA processing is widely used. Used in foam shoe materials, functional shed film, packaging film, hot melt adhesive, wire and cable, toys and other fields. Generally speaking, the performance of EVA resin mainly depends on the content of vinyl acetate in the molecular chain. The market consumption of EVA resin in my country in 2001 was about 290 kt. With the development of my country's shoe industry and the increase in the amount of functional greenhouse film, my country's demand for EVA resin will also increase year by year.

     (1) Foam shoe material

    Shoe material is the main application field of EVA resin in my country. In the EVA resin used in shoe materials, the vinyl acetate content is generally 15% to 22%. Because EVA resin blended foam products have softness, good elasticity, and chemical resistance, they are widely used in the soles and interior materials of travel shoes, hiking shoes, slippers, and sandals. In addition, this material is also used in the fields of sound insulation boards, gymnastics mats and sealing materials. Shunde and Zhongshan in Guangdong, Jinjiang and Quanzhou in Fujian and Wenzhou in Zhejiang are the main production bases of my country's footwear industry, which consume a large amount of EVA resin products every year. In 1999, my country consumed about 150 kt of EVA resin in foamed shoe materials and shock absorption.

     (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 heat preservation performance. Because polyethylene is not polar, even if a certain amount of anti-fogging agent is added, its anti-fogging performance can only be maintained for about 2 months; and The greenhouse film made by adding a certain amount of EVA resin not only has a higher light transmittance, but also has a great improvement in anti-fogging performance, which can generally exceed 4 months. In addition, EVA can also be used to produce packaging films, medical films, laminated films, casting films, etc.

    In 1999, there were more than 50 companies using EVA resin to process films in my country. In 1999, my country produced a total of 800 kt of greenhouse film, of which 220 kt of functional greenhouse film, consumption of about 30 kt of EVA resin, plus packaging film, medical film and other fields, my country consumed 37 kt of EVA resin in the field of film.

    (3) Wire and cable

    With the continuous development of computer and network engineering, people are increasingly using halogen-free flame-retardant cables and silane cross-linked cables for the safety of computer rooms. Because EVA resin has good filler tolerance and crosslinkability, it is used more in halogen-free flame-retardant cables, semiconductor shielded cables and two-step silane cross-linked cables. In addition, EVA resin is also used to make sheaths for some special cables. EVA resin used in wire and cable, the vinyl acetate content is generally 12% to 24%. In 1999, the wire and cable industry consumed about 6 000 tons of EVA.

    (4) Toys

    EVA resin also has many applications in toys, such as children's wheels and seat cushions. In recent years, my country's toy processing industry has developed rapidly. Production is mostly concentrated in coastal areas such as Dongguan, Shenzhen, and Shantou, mainly for export and foreign processing. According to analysis, these manufacturers consume about 5,000 tons of EVA resin each year, and the grades used are basically the same as the shoe materials.   

    (5) Hot melt adhesive

    The hot melt adhesive with EVA resin as the main component, because it does not contain solvents, does not pollute the environment and has high safety, it is very suitable for automated assembly line production. Therefore, EVA foundry resin is widely used in book binding, furniture edge banding, On the assembly of automobiles and household appliances, shoemaking, carpet coating and metal anticorrosive coating.

    Hot melt adhesives mainly use varieties with a vinyl acetate content of 25% to 40%. Although there are products of this brand in China, production has not been arranged for a long time, so they are all occupied by imported materials. In 1999, my country's hot melt adhesive field was estimated to consume 17 kt of EVA resin.

    (6) Other

    EVA resin is also widely used in the fields of inks, bags, wine bottle cushions, etc. It is estimated that the consumption of EVA resin in these areas is no less than 15 kt.