EVA material:
The EVA material is obtained by copolymerization of ethylene (E) and vinyl acetate (VA). The EVA foamed sheet has good flexibility and elasticity, and the surface gloss and chemical stability are also very good. The closed cell structure, Eva The material has anti-aging, odor-resistant, non-toxic, soft shock absorption and biodegradable, so it has a wide range of uses.
First, the characteristics
EVA resin is characterized by good flexibility, rubber-like elasticity, good flexibility under 0 ° C, good transparency and surface gloss, good chemical stability, good anti-aging, and ozone resistance. , non-toxic. It has good blending property with filler and has good coloring and molding processability. It has a great relationship with vinyl acetate content and molecular weight, and melt index. When the melt index (MI) is constant and the vinyl acetate (VA) content is increased, the elasticity, flexibility, compatibility, transparency, and the like are also improved. When the VA content is reduced, the performance is close to that of polyethylene, the rigidity is increased, and the wear resistance and electrical insulation are improved. If the VA content is constant, the melt index increases, the softening point decreases, and the workability and surface gloss are improved but the strength is lowered. Otherwise, the molecular weight increases as the MI decreases and the impact performance and the environmental stress crack resistance are improved. The polarity of the acetate increases the elasticity and viscosity, decreases the crystallinity and electrical properties, and dissolves in hydrocarbon solvents and oils.
Second, use
EVA resins are used in a wide range of applications. Its main products are film, wire and cable, LDPE modifier, sheet, foamed products, injection molded products, coated products, hot melt adhesives and so on. Such as:
1. The film, sheet, and laminate: seal, adhesive, softness, toughness, shrinkage, suitable for flexible packaging film, heat shrinkable film, agricultural film, food packaging film, laminated film, can be used The intermediate layer of the polyolefin laminate film is made.
2. General supplies: It has the advantages of flexibility, environmental stress cracks resistance and good weather resistance. It is suitable for industrial materials such as electric wire insulation sheath, household appliance parts, window sealing materials, etc.
3. Daily groceries include sporting goods, toys, cushions, drawstrings, sealed container lids, EVA rubber football, etc.
4. Auto parts have shock absorbers, fenders, interior, and exterior decorative parts.
5. Foamed products: foamed plastic slippers, sandals, building materials, etc.; injection molding foam has various industrial parts, women’s soles and so on.
6. Adhesive, hot melt adhesive, ink, laminating adhesive.
7. Modified additives: asphalt, crude oil, rubber, and plastic raw materials.
8. E/VA/CO and E/Nba/CO are used to modify PVC, PP, ABS, PA, hot melt adhesive, etc.

 

EVA sole:
EVA sole is characterized by good softness, rubber-like elasticity, good flexibility under 0 °C, good transparency and surface gloss, good chemical stability, good anti-aging and ozone resistance. , non-toxic. It has good blending property with filler and has good coloring and molding processability.
It has a great relationship with vinyl acetate content and molecular weight, and melt index. When the melt index (MI) is constant and the vinyl acetate (VA) content is increased, the elasticity, flexibility, compatibility, transparency, and the like are also improved. When the VA content is reduced, the performance is close to that of polyethylene, the rigidity is increased, and the wear resistance and electrical insulation are improved.
If the VA content is constant, the melt index increases, the softening point decreases, and the workability and surface gloss are improved but the strength is lowered. Otherwise, the molecular weight increases as the MI decreases and the impact performance and the environmental stress crack resistance are improved. The polarity of the acetate increases the elasticity and viscosity, decreases the crystallinity and electrical properties, and dissolves in hydrocarbon solvents and oils.