Main USES of Eva material
EVA material is ethylene - vinyl acetate copolymer, general vinyl acetate (VA) content in 5% ~ 40%.Compared with polyethylene, EVA because of the introduction of vinyl acetate monomer in the molecular chain, thereby reducing the high crystallinity, improve the flexibility, impact resistance, compatibility and heat sealing properties of packing, is widely used in foaming shoe materials, functional shed film, packaging film, hot melt adhesive, wire and cable and toys and other fields.
Generally speaking, the performance of EVA resin mainly depends on the content of vinyl acetate on the molecular chain.In 2001, the market consumption of EVA resin in China was about 290 kt.With the development of China's shoe industry and the increase in the use of functional membrane, China's demand for EVA resin will increase year by year.
1. Foaming shoe material
Shoe material is our country EVA material the mainest application domain.In the EVA material that shoe material USES, acetic acid ethylene content is in 15% ~ 22% commonly.Due to the soft, elastic and chemical corrosion resistant properties of EVA resin blended foam products, they are widely used in the sole and interior decoration materials of high-end tourist shoes, mountaineering shoes, slippers and sandals.
In addition, the material is also used in the field of soundproof panels, gym MATS and sealing materials.China's guangdong shunde, zhongshan, fujian jinjiang, quanzhou and zhejiang wenzhou are the main production base of China's shoe industry, a large number of EVA resin products are consumed every year.In 1999, the total consumption of EVA resin in the field of foaming shoe materials and shock absorption was about 150kt.
The main purpose of EVA film is to produce functional membrane.The functional membrane has high weather resistance, antifogging and heat preservation performance. Because polyethylene does not have polarity, its antifogging performance can only be maintained for about 2 months even if a certain amount of antifogging agent is added.However, the membrane made by adding a certain amount of EVA resin not only has a higher light transmittance, but also has a greater improvement in the anti-fog droplet performance, generally more than 4 months.In addition, EVA can also be used to produce packaging film, medical film, laminating film, casting film, etc.
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In 1999, there were more than 50 enterprises using EVA resin to process film in China.In 1999, China produced 800 kt of shed film, among which 220 kt of functional shed film and 30 kt of EVA material were consumed. In addition, packaging film, medical film and other fields, China consumed 37 kt of EVA resin in the field of thin film.
3) wire and cable
With the continuous development of computer and network engineering, people use halogen-free flame retardant cable and silane crosslinked cable more and more for the sake of the safety of computer room.Due to the good packing inclusions and crosslinking properties of EVA resin, it is widely used in halogen-free flame retardant cables, semiconductor shielded cables and two-step silane crosslinked cables.
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In addition, EVA resin is also used to make some special cable sheath.EVA resin used in electric wire and cable, the content of vinyl acetate is generally 12% ~ 24%.In 1999, the wire and cable industry consumed about 6 000 t of EVA.
4, EVA resin toys in toys also have more applications, such as children's wheels, seat cushion.Our country toy processing industry develops rapidly, the production mainly concentrates in the coastal dongguan, shenzhen, shantou and other places, mainly to export and foreign processing.According to the analysis, these manufacturers consume about 5,000 t of EVA resin every year, using the same brand as the material used for shoes.
5, hot melt adhesive with EVA material as the main component of hot melt adhesive, because do not contain solvents, no pollution and high security, is very suitable for automated assembly line production, therefore they are widely used in wireless binding books, furniture edge banding, cars and home appliances assembly, shoemaking, carpets coating and metal anticorrosion coating.