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POLYETHYLENE RESIN COMPOSITION FOR HIGH PRESSURE PIPE COMPRISING METALLOCENE-BASED POLYETHYLENE, COMPATIBILIZER AND LOW MOLECULAR WEIGHT POLYMER
POLYETHYLENE RESIN COMPOSITION FOR HIGH PRESSURE PIPE COMPRISING METALLOCENE-BASED POLYETHYLENE, COMPATIBILIZER AND LOW MOLECULAR WEIGHT POLYMER
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机译:包含金属茂基聚乙烯,相容剂和低分子量聚合物的高压管用聚乙烯树脂组合物
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摘要
PURPOSE: Provided is a polyethylene resin composition for high pressure pipe which has excellent environmental stress cracking resistance and strength against external pressure, thereby reducing the thickness of a pipe produced therefrom. CONSTITUTION: The polyethylene resin composition comprises (A) 100 parts by weight of metallocene-based polyethylene; (B) 0.1-10 parts by weight of organically modified montmorillonite; (C) 0.5-30 parts by weight of a compatibilizer, wherein ethylenically unsaturated carboxylic acid, ethylenically unsaturated carboxylic acid ester or ethylenically unsaturated carboxylic acid anhydride is grafted into a main chain of polyethylene; and (D) 0.01-5 parts by weight of Ziegler-Natta system polyethylene having a molecular weight of 3000 or less. Particularly, the metallocene-based polyethylene has a melt index of 0.1-5g/10min as measured at a load of 5 kg and at a temperature of 190 deg.C by ASTM D 1238 and a density of 940 g/cm3 or more. The composition may further comprise an acid resistant, an antioxidant and/or processing aids.
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机译:用途:提供一种用于高压管的聚乙烯树脂组合物,该组合物具有优异的耐环境应力开裂性和抗外部压力的强度,从而减小了由其制成的管的厚度。组成:聚乙烯树脂组合物包含:(A)100重量份的茂金属基聚乙烯; (B)0.1-10重量份的有机改性的蒙脱石; (C)0.5-30重量份的增容剂,其中烯键式不饱和羧酸,烯键式不饱和羧酸酯或烯键式不饱和羧酸酐被接枝到聚乙烯的主链上; (D)0.01-5重量份的分子量为3000以下的齐格勒-纳塔体系聚乙烯。特别地,根据ASTM D 1238在5kg的负载和190℃的温度下测得的基于茂金属的聚乙烯的熔体指数为0.1-5g / 10min,并且密度为940g / cm 3或更高。该组合物可以进一步包含耐酸,抗氧化剂和/或加工助剂。
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