Ethylene-Vinyl Acetate Copolymer (EVA) Used in Foaming Shoe Material, Functional Shed Film,

Basic Info

Product Description

ethylene-vinyl acetate copolymer
EVA for short
Relative density 0.92~0.98[1]
The refractive index of 1.480 ~ 1.510
Brittleness temperature < A 50 ºC
The thermal decomposition temperature is 230~250ºC
Stability: with good chemical stability, aging resistance, ozone resistance.
Molecular formula: (C2H4) X.(C4H6O2) Y
Molecular Weight: 2000(average)
Health hazard: Irrating to eyes and skin.
Risk of ignition and explosion: This product is flammable and irritant.
Skin contact: remove contaminated clothing and rinse with running water.
Eye contact: Lift eyelids and rinse with running water or normal saline. Go to a doctor.
Inhalation: away from the scene to fresh air. Go to a doctor.
Intake: drink enough warm water to induce vomiting. Go to a doctor.
The characteristics of
Water resistance: closed bubble structure, non-absorbent, moistureproof, good water resistance.
Corrosion resistance: sea water, oil, acid, alkali and other chemical corrosion, antibacterial, non-toxic, tasteless, no pollution.
Machinability: no joint, and easy to hot pressing, cutting, gluing, laminating and other processing.
Shockproof: high resilience and tension resistance, high toughness, with good shockproof, buffer performance.
Thermal insulation: excellent heat insulation, cold insulation and low temperature performance, can withstand cold and insolation.
Sound insulation: airtight bubble hole, good sound insulation effect. Commonly used features

The main purpose

EVA resin is ethylene - vinyl acetate copolymer, generally vinyl acetate (VA) content in 5%~40%. Compared with polyethylene, EVA, due to the introduction of vinyl acetate monomer in the molecular chain, thereby reducing the high crystallinity, improve the flexibility, impact resistance, filler solubility and thermal sealing performance, is widely used in the foamy shoe material, functional shed film, packaging film, hot melt adhesive, wire and cable and toys and other fields. In general, the performance of EVA resins depends mainly 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 of the amount of functional shed film, China's demand for EVA resin will increase year by year.

(1) foamed shoe material

Shoe material is the main application field of EVA resin in China. In the EVA resin used in footwear, the content of vinyl acetate is generally 15%~22%. Due to its soft, elastic and chemical corrosion resistance, EVA resin blends and foams are widely used in the soles and interior materials of middle and high grade traveling shoes, hiking shoes, slippers and sandals. In addition, this material is also used in the field of sound insulation board, gymnastics mat and sealing material. Shunde and Zhongshan in Guangdong, Jinjiang and Quanzhou in Fujian and Wenzhou in Zhejiang are the main production bases of China's shoe industry, which consume a large amount of EVA resin products every year. In 1999, about 150 kt EVA resin was consumed in the field of foamed footwear materials and shock absorption.

(2) thin film

The main use of EVA film is the production of functional shed film. Functional shed film has high weather resistance, anti-fogging and thermal insulation performance, because polyethylene does not have polarity, even if the addition of a certain amount of anti-fogging agent, its anti-fogging 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 higher light transmittance, but also has a greater improvement in anti-fogging performance, which can generally exceed 4 months. In addition, EVA can also be used in the production of packaging film, medical film, laminated film, casting film, etc.

In 1999, China's use of EVA resin processing film enterprises have more than 50. In 1999, China produced a total of 800 kt shed film, of which functional shed film 220 kt, the consumption of EVA resin about 30 kt, plus packaging film, medical film and other fields, China in the film field of total consumption of EVA resin 37 kt.

(3) Wire and cable

With the development of computer and network engineering, more and more halogen-free flame retardant cables and silane crosslinked cables are used for the safety of computer room. EVA resin is widely used in halogen-free flame retardant cables, semiconductor shielded cables and two-step silane crosslinked cables due to its good packing inclusion and crosslinking. In addition, EVA resin is also used to make some special cable sheath. EVA resin used in wire and cable, the content of vinyl acetate is generally 12%~24%. In 1999, the electric wire and cable industry consumed about 6 000 t of EVA.

(4) toys

EVA resin also has more applications in toys, such as children's wheels, seat cushion and so on. China's toy processing industry is developing rapidly, production is concentrated in the coastal Dongguan, Shenzhen, Shantou and other places, mainly to export and external processing. According to the analysis, these manufacturers consume about 5 000 t of EVA resin every year, and the brand is basically the same as the material used for shoes.

(5) hot melt adhesive

With EVA resin as the main component of hot melt adhesive, because it does not contain solvents, does not pollute the environment and has high safety, it is very suitable for automatic assembly line production, so it is widely used in books wireless binding, furniture edge sealing, automobile and household appliances assembly, shoes, carpet coating and metal anticorrosive coating.

Xingtai Qianjie Technology is a high-tech enterprise specializing in the production, development and export of chemical products in Hebei Province. We are experienced in the production of high quality titanium dioxide, HPMC, HEC and pharmaceutical intermediates, food additives, etc. Our products are widely used in coating industry, construction, daily chemical, food, pharmaceutical, cosmetics, oil drilling, paper, textile, ceramics and other industries.
Our products can meet the needs of different levels of customers. It has been exported to many parts of the world, such as North America, Europe, the Middle East and Southeast Asia. Products in the domestic and foreign markets enjoy a good reputation.