In this case,
2, EVA is ethylene and acetic acid copolymerization, the Chinese Chemical Name: ethylene - vinyl acetate copolymer (ethylene - vinyl acetate copolymer), English Chemical Name: Ethylene Vinyl Acetate Copolymer. EVA is widely used in the field of China's annual market consumption are constantly increasing, especially in the footwear industry, is used in high-end travel shoes, hiking shoes, slippers, sandals and interior materials in the soles. In this case,
Ethylene [ '?θ?, lin] [Vinyl [vinyl]
EVA is characterized by good flexibility, rubber - like elasticity, at - 50 ℃ still has a relatively low molecular weight, high molecular weight, low molecular weight. Good flexibility, transparency and surface gloss, good chemical stability, anti-aging and ozone-resistant strength, non-toxic. And the filler blending, coloring and molding processability. In this case,
The polarity of the acetate increases elasticity and viscosity, decreases crystallinity and electrical properties, and is soluble in hydrocarbons and oils. In this case,
3, Polypropylene (PP plastic) Polypropylene is the second after the development of nylon resin is a good variety, it is a high density, no side chain, high crystallization will be a linear polymer, with excellent overall performance. Not colored when the white translucent, waxy; lighter than polyethylene. Transparency is also better than polyethylene, rigid than polyethylene. In this case,
Common products: pots, barrels, furniture, film, woven bags, caps, car bumpers and so on. In this case,
PP plastic is a polypropylene plastic, is non-toxic, no harm to the human body. Polypropylene production of the cup is non-toxic, the manufacture of the processing temperature (℃) 180 ~ 240. So boiling water will not break it down. So there is no need to worry about the toxicity of food appliances. In this case,
Chemical stability: Polypropylene chemical stability is very good, in addition to concentrated sulfuric acid, concentrated nitric acid erosion, the other various chemical reagents are relatively stable, but low molecular weight aliphatic hydrocarbons, aromatic hydrocarbons and chlorinated hydrocarbons can make PP softening and swelling, while its chemical stability increases with the degree of crystallinity has also increased