-
The one upstairs in the encyclopedia should not engage in plagiarism.
-
EVA is a plastic material composed of ethylene (E) and vinyl acetate (VA). The higher the content of vinyl acetate, the higher the transparency, softness and toughness.
EVA and PEVA are characterized by:
1. Biodegradable: It will not cause harm to the environment when discarded or burned.
2. Similar to PVC**: EVA** is more expensive than toxic PVC, but it is cheaper than phthalate-free PVC.
3. Light weight: The density of EVA is between to, while PVC is.
4. No odor: EVA does not contain organic odors like Ammonia or other organic odors.
5. No re-ignition volt metal: in line with relevant international toy regulations (EN-71 Part 3 and ASTM-F963).
6. Phthalate-free: suitable for children's toys and will not produce plasticizer release hazards.
7. High transparency, softness and toughness: the application range is very broad.
8. Super low temperature resistance (-70C): suitable for icing environment.
9. Resistance to water, salt and other substances: it can be stable in the case of large applications.
10. High heat paste: It can be firmly attached to nylon, polyester, canvas and other fabrics.
11. Low lamination temperature: it can speed up production.
-
Take a plastic. then perturbation.
It is formed by the copolymerization of ethylene and acetic acid, and due to the introduction of vinyl acetate monomer in the molecular chain, the high crystallinity is reduced, and the toughness, impact resistance, packing compatibility and heat sealing performance are improved.
It is widely used in foam shoe materials, functional shed films, packaging molds, hot melt adhesives, wires and cables and toys, especially in the footwear industry, and is used in the soles and interior materials of medium and high-end tourist shoes, hiking shoes, slippers and sandals.
Classification: 1. EVA with vinyl acetate content below 5%, its main products are films, wires and cables, LDPE modifiers, adhesives, etc.;
2. EVA products with vinyl acetate content of 5% and 10% are elastic films, etc.;
3. EVA with vinyl acetate content of 20-28% is mainly used for hot-melt adhesives and coating products.
-
What is EVA, what are the characteristics and application scope of shoe materials?
The Lantern Festival, also known as the Shangyuan Festival, the Little New Year, the Yuan Xi Festival or the Lantern Festival, is the first major festival after the Spring Festival and is one of the traditional festivals of the Chinese people in China and the Chinese diaspora. The first lunar month is the first month of the lunar calendar, and the ancients called the night "xiao", so the fifteenth day of the first full moon night of the year is called the Lantern Festival. [1][2] >>>More
The Air Force University has the following:
1.Air Force Command College (Beijing). >>>More
The main use of carbon fiber is in the manufacture of high-tech equipment such as aerospace, and in the manufacture of advanced composite materials. Carbon fiber refers to high-strength and high-modulus fibers with a carbon content of more than 90%, and its high temperature resistance ranks first among all chemical fibers. It is made of acrylic fiber and viscose fiber, which is oxidized and carbonized at high temperature, and has the characteristics of high temperature resistance, friction resistance, electrical conductivity, thermal conductivity and corrosion resistance. >>>More
The author of "Border City" is Shen Congwen. "Border City" is a novella written by Shen Congwen**, first published in 1934. >>>More
BMW's young and fashionable team 1 Series, 3 Series Coupe and X1 will lead the challengers from the Tianma Mountain Circuit to Shanghai through Ningbo Yuyao Hemudu Culture and Wenzhou Ouyue Culture. As the world's only compact premium rear-wheel drive hatchback, the BMW 1 Series is the best "athlete" in its class, not only perfectly inheriting the BMW sports DNA, but also interpreting the agile handling of a light sedan. The new BMW 3 Series Coupe and Convertible Coupe have been carefully designed to combine sporty, elegant looks, efficient engines and innovative features to deliver an even better driving experience. >>>More