Vinyl alcohol copolymer for plastic sheet
DATE：2021/4/26 9:03:32 / READ： / SOURCE：This station
Vinyl alcohol copolymer for plastic sheet
Plastic sheet production line www.handern.com
Kuraray company is a company established by water-soluble resin polyvinyl alcohol. Therefore, it is very natural to develop modified polyvinyl alcohol. The biggest characteristic of polyvinyl alcohol is good gas resistance, but poor processability. Therefore, ethylene is used to improve the processability and moisture resistance of polyvinyl alcohol. The gas resistance of Eval is related to the content of ethylene in the molecule. With the increase of ethylene content, the gas resistance decreases, the moisture resistance increases and the formability increases. Eval is not obtained by copolymerization of ethylene and vinyl alcohol, but by hydrolysis of EVA. EVA resin was prepared by reaction of EVA with methanol and catalyst. Plastic sheet production line www.handern.com
1. Basic characteristics
① Eval has excellent oxygen resistance, good transparency, non-toxic, and can be directly used in contact with food and drugs;
② It has good oil resistance and can be used to package edible oil and various oil-bearing foods. It can also be used for packing industrial oil products, such as diesel, gasoline and lubricating oil. It has excellent fragrance retention;
③ The tensile strength of Eval with high degree of saponification is twice that of PE (4) good weather and UV resistance.
In high humidity air, the barrier property of Eval decreases. Therefore, Eval resin is often used as the intermediate layer of composites, which can give full play to the barrier property of eval.
EVAL EP K102 is made by Kuraray company of Japan, containing 38% ethylene ( The results show that the resin can be compatible with PP, and they can be coextruded. In solid state molding, the draw ratio is high. EVAL 4% for E and B ( Eval has wide temperature range, large drawing ratio and 2 times higher barrier property after drawing XEP Type 40 can be coextruded with hips. The tensile property can be improved. Plastic sheet production line www.handern.com
Evalepl is a high barrier grade with ethylene content of 27% ( Mole fraction). MFR ( 10 min, melting point 191c, The permeability of O 8mL. . um/ ( m d. MPO can overcome the disadvantage of poor processability when B-field content is the lowest: high barrier eval The ethylene content of ep-f is 32% mol, MFR (190c-1-3 / min), melting point 181c, oxygen permeability 142ml . pm/ ( m2.d. MPa)。 Eval can be extruded, injected and bonded. Eval is obtained by hydrolysis of EVA with high VA content. Generally, the content of ethylene in Eval is 30% ~ 45%. Compared with PVDC, PVDC can be extruded, but the molding temperature is narrow, while Eval has a wide range of molding temperature, so its formability is greater than PVDC; The density is only 1.2g/cm3 It is much smaller than PVDC, so the packaging area or volume (yield) is larger; PVDC is easy to be aged in the same environment, and chlorine in waste is not easy to be treated, which leads to environmental problems, while Eval is chlorine free and has little environmental problems; Eval can be sandwiched in the middle of multi-layer plastics to maintain the low humidity environment of Eval, so as to obtain high barrier.
Eval resin can be used to produce non stretch film F (12 μ m、15 μ m、20 μ M thick), E-type (15 μ m、20 μ m. In addition, it can also produce biaxially oriented Eval film XL (12um fifteen μ M thick). Using pp480p μ M / adhesive resin / Eval / pp120 μ m ( It can be used at 120c for 30min High temperature cooking. Plastic sheet production line www.handern.com
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