... 虽然无毒，价廉，但抗冲击强度差，作为供水管材不理想，通过共聚合的方式使聚丙烯改性，提高了管材的抗冲击强度等性能。改性聚丙烯管有三种，即均聚共聚聚丙烯管(PP-H) 、嵌段共聚聚丙烯管(PP-B) 、无规共聚聚丙烯管(PP-R) ...
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This paper studied the structure and properties of propylene-ethylene block copolymer (PP-B) as speciality resin for tubing.
研究了乙丙嵌段共聚聚丙烯(PP - B)管材专用树脂的结构与性能。
Non-poisonous, good light-resistant and heat-resistant color was used for manufacture of the color master batch applied for PP-R, PP-B pipe materials.
采用无毒、耐候性好、热稳定性高的颜料制得PP-R、PP-B管材料专用色母粒，考察了色母粒对PP-R、PP-B管材料力学性能、耐热性、耐光性、卫生安全性的影响。
For Group B, the vitalight lamp radiation and steaming of methanal plus PP were used in combined air sterilization.
紫外线灯照射与甲醛加PP熏蒸联合空气消毒为B组。
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