PPR管材专用料的结构与性能研究  

Study on Correlation between Structure and Properties PPR Pipe Special Resins

作　　者：陈锬 CHEN Tan(National Engineering Laboratory for Plastic Modi cation and Processing,Kingfa Science and Technology Co.,Ltd.,Guangdong Guangzhou 510663,China)

机构地区：[1]金发科技股份有限公司,塑料改性与加工国家工程实验室,广东广州510663

出　　处：《广州化工》2023年第14期63-66,共4页GuangZhou Chemical Industry

摘　　要：深入研究了三种商用无规共聚聚丙烯(PPR)管材专用料的分子链结构与力学性能之间的关系。通过高温凝胶色谱、差示扫描量热仪、连续自成核退火热分级以及扫描电子显微镜等测试方法对PPR分子链结构进行了详细表征,并利用拉伸和冲击测试评价管材料的力学性能。研究发现分子量和共聚单体分布都会显著影响PPR管材的力学性能。鸿基石化早期生产的R025P分子量较低,其利用共聚单体的均匀分布以提高晶片间连接链的含量;但是由于其形成的晶片较薄,管材刚性不佳。燕山石化C4220的分子量最高,晶片间传导应力的连接链含量高、力学性能优异。工艺调整后R025P的分子量明显提高、力学性能得到显著改善。由此可见,分子量是影响PPR管材力学性能的最关键因素。The relationship between the molecular chain structure and mechanical properties of three commercial random copolymer polypropylene(PPR)pipe specialty resins was studied in depth.The molecular chain structure of PPR was characterized in detail by high temperature gel permeation chromatography,differential scanning calorimetry,successive self-nucleation and annealing and electron scanning microscopy,and tensile and impact tests were used to evaluate the mechanical properties of pipe materials.It was found that both molecular weight and comonomer distribution significantly affected the mechanical properties of PPR pipes.The molecular weight of R025P produced by Hongji Petrochemical in the early period was low,and the content of the connection chain between the lamellar was improved by the uniform distribution of comonomers.However,because of the thin lamellar,the rigidity of the pipe was not enough.C4220 produced by Yanshan Petrochemical had high molecular weight and high content of the connection chain of conducting stress between lamellar,so it had excellent mechanical properties.The molecular weight and mechanical properties of R025P were improved obviously after process adjustment.Therefore,molecular weight and distribution were the most critical factors affecting the mechanical properties of PPR pipe.

关 键 词：无规共聚聚丙烯 分子量 共聚单体 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]