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农膜的应用

      光稳定剂在塑料制品中应用最重要的领域是农用塑料,例如农用棚膜、地膜、饲草膜、养殖膜、灌溉塑料管、节水塑料器材等。中国农用薄膜产 量居世界首位,是其他所有国家总和的1. 6倍,全国拥有大小规模不等农膜生 产企业1000多家,生产能力达200万t以上其中年生产能力超过万吨的约 s0家,其生产能力和产量均占全国总量的s0%a全国农膜年消费量已达120 万t,其中地膜55万a,地膜覆盖而积2. 2亿亩以上;拥膜年耗用量已达65万吨,棚膜覆盖面积达2500万亩。在农用塑料和农用薄膜中,光稳定剂消费最多 的是农用棚膜,农用棚膜光稳定剂消费量占市场消费总量40%左右。

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      20世纪70年代我国即开始使用HALS光稳定剂体系耐老化PVC棚膜,主要是GW-540体系,并发现其光稳定作用不亚于二苯甲酮等紫外线吸收剂 (见表3-6 ) e 20世纪80年代我国采用GW-54。和镍络合物碎灭剂2002组成的耐老化体系显著提高了LDPE棚膜耐老化性能,在有效使用期内高温季节骨架处无棚膜断裂现象。例如添加。. 4%GW-540和。.1 00/a 2002的LDPE/EVA 三层复合棚膜,厚度为。. 12mm,经三年五个月连续覆盖使用效果良好(见表 3-7)。口前我国棚膜以LDPE膜为主,PVC棚膜只在吉林省等东北地区应用。

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