eva EVA resin, plastic name: ethylene - vinyl acetate English name: Ethylene-vinyl acetate copolymer English Name: Poly (ethylene-co-vinyl acetate) ethylene - vinyl acetate copolymer referred to as EVA, typically vinyl acetate (VA) containing 5 % to 40%. Compared with polyethylene, EVA [1] Since the introduction of the molecular chain of vinyl acetate monomer, which reduces the high crystallinity, improved flexibility, impact resistance, and thermal compatibility packing sealing performance, are widely used Foam shoe materials, functional films, packaging films, adhesives, wire and cable and toys and other fields. EVA resins are characterized by good flexibility, rubber-like elastic, despite the -50 ℃ to have good flexibility, transparency and surface gloss, good chemical stability, anti-aging and ozone resistance strength good, non-toxic. Mixing with the filler is good, good coloring and forming. EVA resin is widely used. In general, vinyl acetate content of 5% or less of the EVA, its main products are thin film, wire and cable, LDPE modifier, adhesive, etc.; vinyl acetate content of 5% to 10% of the EVA film and other flexible products; acetate content of 20 ~ 28% of EVA, is mainly used for hot-melt adhesives and coating products; vinyl acetate content of 5% to 45%, the main products for film (including agricultural film) and sheets, injection molding, molded products, foam products, hot melt adhesives. Such as: (1) films, sheets and laminated products: a seal, adhesion, flexibility, strength and toughness, tight, suitable for flexible packaging film, shrink film, agricultural film, food packaging films, laminated films, polyolefin laminated film can be used to make the middle layer. (2) General supplies: a flexible, anti-environmental stress cracking resistance, and good climate advantages for industrial use of electric wire insulation material bags, household accessories, window sealing materials. (3), groceries class of sporting goods, toys, cushions, straps, sealed container lid, EVA rubber football. (4) auto parts are shock absorbers, fenders, car accessories, such as internal and external decoration. (5) foam products: foamed with pressurized foam slippers, sandals and construction materials. Foam injection molding a variety of industrial parts, female soles, hot melt adhesives. Ethylene - vinyl acetate copolymer EVA can be injection molding process, extrusion, blow molding, calendering, rotational vacuum thermoforming, foaming, coating, sealing, welding, forming. Ethylene - vinyl acetate copolymer (EVA) EVA resin, ethylene - vinyl acetate copolymer, vinyl acetate generally (VA) content of 5% to 40%. Compared with polyethylene, EVA molecular chain due to the introduction of vinyl acetate monomer, which reduces the high crystallinity, improved flexibility, impact resistance, and thermal compatibility packing sealing performance, are widely used in foam shoes materials, functional films, packaging films, adhesives, wire and cable and toys and other fields. 
 EVA resins are ethylene - vinyl acetate copolymer, vinyl acetate generally (VA) content of 5% to 40%. Compared with polyethylene, EVA molecular chain due to the introduction of vinyl acetate monomer, which reduces the high crystallinity, improved flexibility, impact resistance, and thermal compatibility packing sealing performance, are widely used in foam shoes materials, functional films, packaging films, adhesives, wire and cable and toys and other fields. In general, EVA resin performance depends primarily on the molecular chain of vinyl acetate content. EVA resin 2001 market consumption of about 290 kt. With the development of China's footwear industry and the increase in the amount of functional films, EVA resin demand in China will be on the increase every year. (1) of EVA foam resin shoe shoe is the most important applications. Shoes used in the EVA resin, vinyl acetate content is generally 15% to 22%. EVA foam products resin blends as a soft, flexible, and resistant to chemical corrosion and other properties, is widely used in high-end shoes, hiking shoes, slippers, sandals, shoes and interior materials. In addition, this material is also used for noise barriers, the field of gymnastics mats and sealing materials. China Guangdong Shunde, Zhongshan, Fujian Jinjiang, Quanzhou and Zhejiang Wenzhou is the major shoe production base in China, annual consumption of a large number of EVA resin. 1999 China Shoes and shock absorption foam EVA resin, consuming a total area of about 150 kt. (2) EVA thin films are mainly used for production of functional films. Functional films with a high weather, anti-mist, and thermal insulation properties, the polyethylene does not have polarity, even add a certain amount of fog drops its anti-mist properties only for 2 months or so; and Add a certain amount of films made of EVA resin, not only has high light transmission rate, and anti-mist properties has improved greatly, and can be more than four months. In addition, EVA can also be used to produce packaging film, medical film, laminated film, cast film. In 1999, using the EVA resin processing enterprises have more than 50 films. In 1999, total production of films 800 kt, in which the function of the films 220 kt, 30 kt consume about EVA resin, along with packaging film, medical film field, China's total consumption in the field of EVA resin film 37 kt. (3) wire and cable with the computer and the continuous development of network engineering, out of the engine room security considerations, it is the increasing use of halogen-free flame retardant cables and silane crosslinked cable. The EVA resin has good filler inclusive and can be cross-linked nature, and therefore non-halogen flame retardant cable, shielded cable and two-step semiconductor silane crosslinked cable to use more. In addition, EVA resins are also used in making some special cable sheath. Wire and cable used in the EVA resin, vinyl acetate content is generally 12% -24%. In 1999, EVA wire and cable industry consume about 6 000 t. (4) Toys EVA resin in toys have more applications, such as child wheels, upholstery and so on. In recent years, the rapid development of China's toy processing industry, producing more concentrated in coastal areas of Dongguan, Shenzhen, Shantou and other places, mainly in export and foreign processing. According to analysis, the annual consumption of EVA resin manufacturers about 5 000 t, using the grade with the same shoe materials. (5) hot melt adhesive resin as the main component of the EVA hot melt, as solvent, no pollution and high security, ideally suited for automated production lines, so it is widely used in wireless binding books, furniture cover edge, cars and household appliances assembly, footwear, carpet coatings and metal corrosion coatings. Vinyl acetate content of the main use of hot melt at 25% to 40% of the species. Although the grade of domestic products, but not long-term arrangements for the production, the share of imported materials have all been there. In 1999, estimated consumption of the field of EVA hot melt adhesive resin 17 kt; melt production process by adding 1-3% of the closed curing agent w-8035/W-8235. Can significantly improve the water resistance, wear resistance, adhesive strength of overall performance. (6) Other EVA resin in the ink, bags, cushion covers and other areas of the bottle also has a more widely used, EVA resin consumption in these areas is estimated less than 15 kt. Phenolic resin (BAKELITE) the condensation product of phenols and aldehydes known as phenolic resin, often refers to generally by the condensation reaction of phenol and formaldehyde derived from synthetic resin, it is the first synthesis of a class of thermosetting resins. While the phenolic resin is the oldest of a class of thermosetting resins, but because of its easy to get raw materials, synthetic convenience, and the phenolic resin has good mechanical strength and heat resistance, in particular, the instantaneous high temperature ablation of outstanding performance, and resin itself broad room for modification, so the current is still widely used in the manufacture of phenolic resin, glass fiber reinforced plastics, carbon fiber reinforced plastic and other composite materials. Phenolic resin composite materials especially in the aerospace industry (space vehicles, rockets, missiles, etc.) as the instantaneous temperature and ablation of the structural material has a very important purpose. Phenolic resin and the curing process in full compliance with the law of condensation reaction size. Control of different synthetic conditions (such as the ratio of phenol and formaldehyde, the type of catalyst used, etc.), can be two different types of phenolic resin: a class called thermosetting phenolic resin, it is a further reaction with active hydroxymethyl group of the resin, synthetic melon if unchecked, will make the body to form a condensation reaction has been carried out without melting, the insoluble network structure with three-curing resin, so this kind of resin, resin, also known as the first order; another known as the thermoplastic resin, it is linear resin, the synthesis process will not form three-network structure of the curing process in the further curing agent must be added to such resins, also known as second resin. These two types of resin and curing are not the same principle, resin molecular structure is different.