EVA sole material analysis

Time:

2019-11-13

The material used in EVA soles is ethylene/vinyl acetate copolymer (also known as ethylene-vinyl acetate copolymer), which is made of ethylene (E) and vinyl acetate (VA) copolymerization, English full name: EthyleneVinyl Acetate. Referred to as EVA, the content is 5%~40%.

Compared with polyethylene, EVA is widely used in foamed shoe materials, functional shed films, packaging films, hot melt adhesives, wires and cables and toys due to the introduction of vinyl acetate monomer in the molecular chain, thereby reducing high crystallinity, improving flexibility, impact resistance, filler compatibility and heat sealing performance.

Features of EVA sole:

EVA sole is characterized by good softness, rubber-like elasticity, good flexibility below 0 °C, good transparency and surface gloss, good chemical stability, good anti-aging and ozone resistance, and non-toxicity. It has good mixing with fillers, good coloring and molding processability.

It has a lot to do with vinyl acetate content, molecular weight and melt index. When the melting index (MI) is certain and the content of vinyl acetate (VA) increases, its elasticity, flexibility, compatibility, transparency, etc. also increase. 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, the processability and surface gloss improve but the strength decreases, otherwise, with the decrease of MI, the molecular weight increases, and the impact performance and environmental stress cracking resistance increase. The polarity of acetate increases elasticity and viscosity, decreases crystallinity and electrical properties, and is soluble in hydrocarbon solvents and oils.

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