Ethylene-vinyl alcohol copolymer (EVA
DATE：2019/12/4 8:53:24 / READ： / SOURCE：This station
Section 12 Ethylene-vinyl alcohol copolymer (EVA
Ethylene-vinyl alcohol copolymer is a high-barrier resin produced in 1972 by the Japanese company Kuraray.
EVAL resin was first used in multi-layer coextrusion to produce composite high-barrier bottles. It was used to fill lettuce oil and egg yolk sauce as inflatable packaging materials. Due to the diversification of packaging forms and packaging contents, the advancement of packaging technology, and the role of barrier EVAL resin have been more and more valued by people, so it has developed rapidly.
Since Kuraray is a company established as a water-soluble resin, polyvinyl alcohol, it has developed
Vinyl alcohol is a very natural thing. The biggest feature of polyvinyl alcohol is that it has excellent gas barrier properties but poor processability. For this reason, ethylene is used to improve the processability and moisture resistance of polyvinyl alcohol. The gas barrier properties of EVAL are related to the ethylene content in the molecule. As the ethylene content increases, the gas barrier properties decrease, the moisture barrier properties increase, and the moldability improves. EVAL is not obtained by copolymerization of ethylene and vinyl alcohol. It is obtained by hydrolysis of EVA. The EVA is reacted with methanol and a catalyst to obtain an EVAL resin.
(A0)
1. Basic characteristics
① EVAL has excellent oxygen resistance, good transparency, non-toxic, and can be directly used in contact with food and medicine
② Has good oil resistance, can package edible oil and various oily foods. Can also be used for industrial oil products, such as: diesel gasoline, lubricants packaging. Has excellent fragrance retention;
③ EVAL has good mechanical properties. EVAL with high saponification degree has a tensile fracture strength twice that of PE
④ Good weather resistance and UV resistance.
EVAL in high-humidity air has reduced barrier properties. For this reason, EVAL resin is often used as an intermediate layer of composite materials, so that the barrier properties of EVAL can be fully exerted.
Tetrahydrogenation
EVAL EP-K102 is a 38% (mole fraction) ethylene resin produced by Japan's Kuraray Company.
Compatible, both can be co-extruded, and have a higher stretch ratio during solid phase molding. EVAL E contains 44% (mole fraction) of ethylene, wide molding temperature range, large stretch ratio, and the barrier property can be doubled after stretching. EVAL XEP-40 can be co-extruded with HPS to improve stretchability. EVAL EP-H201 contains 38% (mole fraction) of ethylene and can be co-extruded with nylon with high processing temperature. EVAL with low ethylene content can be improved by blending with 8% to 10% (mass fraction)
Ethylene-vinyl alcohol copolymer is a high-barrier resin produced in 1972 by the Japanese company Kuraray.
EVAL resin was first used in multi-layer coextrusion to produce composite high-barrier bottles. It was used to fill lettuce oil and egg yolk sauce as inflatable packaging materials. Due to the diversification of packaging forms and packaging contents, the advancement of packaging technology, and the role of barrier EVAL resin have been more and more valued by people, so it has developed rapidly.
Since Kuraray is a company established as a water-soluble resin, polyvinyl alcohol, it has developed
Vinyl alcohol is a very natural thing. The biggest feature of polyvinyl alcohol is that it has excellent gas barrier properties but poor processability. For this reason, ethylene is used to improve the processability and moisture resistance of polyvinyl alcohol. The gas barrier properties of EVAL are related to the ethylene content in the molecule. As the ethylene content increases, the gas barrier properties decrease, the moisture barrier properties increase, and the moldability improves. EVAL is not obtained by copolymerization of ethylene and vinyl alcohol. It is obtained by hydrolysis of EVA. The EVA is reacted with methanol and a catalyst to obtain an EVAL resin.
(A0)
1. Basic characteristics
① EVAL has excellent oxygen resistance, good transparency, non-toxic, and can be directly used in contact with food and medicine
② Has good oil resistance, can package edible oil and various oily foods. Can also be used for industrial oil products, such as: diesel gasoline, lubricants packaging. Has excellent fragrance retention;
③ EVAL has good mechanical properties. EVAL with high saponification degree has a tensile fracture strength twice that of PE
④ Good weather resistance and UV resistance.
EVAL in high-humidity air has reduced barrier properties. For this reason, EVAL resin is often used as an intermediate layer of composite materials, so that the barrier properties of EVAL can be fully exerted.
Tetrahydrogenation
EVAL EP-K102 is a 38% (mole fraction) ethylene resin produced by Japan's Kuraray Company.
Compatible, both can be co-extruded, and have a higher stretch ratio during solid phase molding. EVAL E contains 44% (mole fraction) of ethylene, wide molding temperature range, large stretch ratio, and the barrier property can be doubled after stretching. EVAL XEP-40 can be co-extruded with HPS to improve stretchability. EVAL EP-H201 contains 38% (mole fraction) of ethylene and can be co-extruded with nylon with high processing temperature. EVAL with low ethylene content can be improved by blending with 8% to 10% (mass fraction)
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