Ethylene-vinyl acetate copolymer White granular solid EVA 14-2 Oriental Organic

Ethylene-vinyl acetate copolymer (EVA), is a general-purpose polymer, the molecular formula is (C2H4)x.(C4H6O2)y, flammable, non-irritating burning smell

Ethylene and vinyl acetate copolymer is the most important product of ethylene copolymer, which is generally referred to as EVA abroad. But in our country, people divide ethylene and vinyl acetate copolymers into EVA resin, EVA rubber and EVA emulsion according to the difference of vinyl acetate content. Products with a vinyl acetate content of less than 40% are EVA resins; products with a vinyl acetate content of 40% to 70% are very flexible; full of elastic characteristics, EVA resins with this content range are sometimes called EVA rubber; vinyl acetate content is 70%. It is usually in an emulsion state in the range of ~95%, called EVA emulsion. The appearance of EVA emulsion is milky white or slightly yellow.

Water resistance: closed cell structure, non-absorbent, moisture-proof, good water resistance.
Corrosion resistance: Resistant to seawater, grease, acid, alkali and other chemicals, antibacterial, non-toxic, odorless, and pollution-free.
Processability: no joints, and easy to process such as hot pressing, cutting, gluing, laminating, etc.
Anti-vibration: high resilience and tensile strength, high toughness, good shock-proof and cushioning performance.
Thermal insulation: excellent thermal insulation, thermal insulation and cold protection and low temperature performance, can withstand severe cold and exposure.
Sound insulation: closed cells, good sound insulation.

When the content of vinyl acetate in EVA is less than 20%, it can be used as plastic. EVA has good low temperature resistance, and its thermal decomposition temperature is low, about 230 ℃. With the increase of molecular weight, the softening point of EVA increases, the processability and surface gloss of plastic parts decrease, but the strength increases and the impact The toughness and environmental stress cracking resistance are improved. The chemical resistance and oil resistance of EVA are slightly worse than PE (polyethylene) and PVC (polyvinyl chloride), and the change is more obvious with the increase of vinyl acetate content.
Compared with PE, the performance of EVA is improved, mainly in terms of elasticity, flexibility, gloss, air permeability, etc. In addition, its resistance to environmental stress cracking has been improved, and the tolerance of fillers has increased, and more reinforcing fillers can be added. Methods to avoid or reduce the decline of EVA mechanical properties than PE.

EVA resin is an ethylene-vinyl acetate copolymer, and the general vinyl acetate (VA) content is 5% to 40%. Compared with polyethylene, EVA is widely used in foam shoes due to the introduction of vinyl acetate monomer into the molecular chain, which reduces high crystallinity and improves flexibility, impact resistance, filler compatibility and heat sealing performance. 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.
1. Foam shoe material
Shoe material is the most important 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 the properties of softness, good elasticity and chemical corrosion resistance, they are widely used in the soles and interior materials of middle and high-end travel shoes, hiking shoes, slippers and sandals. In addition, this material is used in the fields of sound insulation boards, gymnastics mats and sealing materials.
2. Film
The main use of EVA film is to produce functional shed film. Functional shed film has high weather resistance, anti-fog droplet and thermal insulation properties. Since polyethylene is not polar, even if a certain amount of anti-fog droplet agent is added, its anti-fog droplet performance can only be maintained for about 2 months; The shed film made of adding a certain amount of EVA resin not only has a high light transmittance, but also has a great improvement in the anti-fog droplet performance, which generally lasts for more than 4 months. In addition, EVA can also be used to produce packaging films, medical films, lamination films, casting films, etc.
3. Wire and cable
With the continuous development of computer and network engineering, people use more and more halogen-free flame retardant cables and silane cross-linked cables for the safety of computer rooms. Because EVA resin has good filler inclusion and cross-linkability, it is widely used 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 some special cable jackets. In the EVA resin used in wire and cable, the vinyl acetate content is generally 12% to 24%.
4. Toys
EVA resin also has many applications in toys, such as children's wheels, seat cushions, etc.
5. Hot melt adhesive
The hot melt adhesive with EVA resin as the main component is very suitable for automatic assembly line production because it does not contain solvent, does not pollute the environment and has high safety, so it is widely used in book binding, furniture edge banding, automobiles and household appliances. assembly, footwear, carpet coating and anti-corrosion coating of metal.
It can be used to make refrigerator pipes, gas pipes, civil engineering plates, containers and daily necessities, etc. It can also be used to make packaging films, gaskets, medical equipment, and can also be used as hot melt adhesives, cable insulation layers, etc.

Water resistance: closed cell structure, non-absorbent, moisture-proof, good water resistance.
Corrosion resistance: Resistant to seawater, grease, acid, alkali and other chemicals, antibacterial, non-toxic, odorless, and pollution-free.
Processability: no joints, and easy to process such as hot pressing, cutting, gluing, laminating, etc.
Anti-vibration: high resilience and tensile strength, high toughness, good shock-proof and cushioning performance.
Thermal insulation: excellent thermal insulation, thermal insulation and cold protection and low temperature performance, can withstand severe cold and exposure.
Sound insulation: closed cells, good sound insulation.

When the content of vinyl acetate in EVA is less than 20%, it can be used as plastic. EVA has good low temperature resistance, and its thermal decomposition temperature is low, about 230 ℃. With the increase of molecular weight, the softening point of EVA increases, the processability and surface gloss of plastic parts decrease, but the strength increases and the impact The toughness and environmental stress cracking resistance are improved. The chemical resistance and oil resistance of EVA are slightly worse than PE (polyethylene) and PVC (polyvinyl chloride), and the change is more obvious with the increase of vinyl acetate content.
Compared with PE, the performance of EVA is improved, mainly in terms of elasticity, flexibility, gloss, air permeability, etc. In addition, its resistance to environmental stress cracking has been improved, and the tolerance of fillers has increased, and more reinforcing fillers can be added. Methods to avoid or reduce the decline of EVA mechanical properties than PE.

EVA resin is an ethylene-vinyl acetate copolymer, and the general vinyl acetate (VA) content is 5% to 40%. Compared with polyethylene, EVA is widely used in foam shoes due to the introduction of vinyl acetate monomer into the molecular chain, which reduces high crystallinity and improves flexibility, impact resistance, filler compatibility and heat sealing performance. 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.
1. Foam shoe material
Shoe material is the most important 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 the properties of softness, good elasticity and chemical corrosion resistance, they are widely used in the soles and interior materials of middle and high-end travel shoes, hiking shoes, slippers and sandals. In addition, this material is used in the fields of sound insulation boards, gymnastics mats and sealing materials.
2. Film
The main use of EVA film is to produce functional shed film. Functional shed film has high weather resistance, anti-fog droplet and thermal insulation properties. Since polyethylene is not polar, even if a certain amount of anti-fog droplet agent is added, its anti-fog droplet performance can only be maintained for about 2 months; The shed film made of adding a certain amount of EVA resin not only has a high light transmittance, but also has a great improvement in the anti-fog droplet performance, which generally lasts for more than 4 months. In addition, EVA can also be used to produce packaging films, medical films, lamination films, casting films, etc.
3. Wire and cable
With the continuous development of computer and network engineering, people use more and more halogen-free flame retardant cables and silane cross-linked cables for the safety of computer rooms. Because EVA resin has good filler inclusion and cross-linkability, it is widely used 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 some special cable jackets. In the EVA resin used in wire and cable, the vinyl acetate content is generally 12% to 24%.
4. Toys
EVA resin also has many applications in toys, such as children's wheels, seat cushions, etc.
5. Hot melt adhesive
The hot melt adhesive with EVA resin as the main component is very suitable for automatic assembly line production because it does not contain solvent, does not pollute the environment and has high safety, so it is widely used in book binding, furniture edge banding, automobiles and household appliances. assembly, footwear, carpet coating and anti-corrosion coating of metal.
It can be used to make refrigerator pipes, gas pipes, civil engineering plates, containers and daily necessities, etc. It can also be used to make packaging films, gaskets, medical equipment, and can also be used as hot melt adhesives, cable insulation layers, etc.