釜内聚合法制备β晶型聚丙烯  

Preparation of β-polypropylene in a polymerization reactor

作　　者：姚日远[1,2] 刁国旺[2] 徐东炘 

机构地区：[1]扬州石化有限责任公司,江苏省扬州市225000 [2]扬州大学化学化工学院,江苏省扬州市225009

出　　处：《合成树脂及塑料》2013年第1期6-9,共4页China Synthetic Resin and Plastics

摘　　要：利用小本体聚丙烯(PP)聚合装置及技术,将β成核剂于丙烯聚合前加入聚合釜中,实现了具有较高β晶含量PP的釜内在线制备。当β成核剂含量较低时,催化剂活性无显著降低,PP的相对分子质量及其分布也变化不大。当成核剂质量分数在0.08%～0.12%时,利用广角X射线衍射测试的PP中β晶的相对含量可达85%。差示扫描量热法分析及力学性能测试表明:β晶型PP的结晶速率明显高于不含β成核剂的普通PP,且具有良好的韧性。Polypropylene（PP） containing high content of β-crystal（β-PP） was prepared with small scale bulk PP process in a polymerization reactor by introducing the β-nucleating agent into the reactor prior to propylene polymerization.Adding small amounts of β-nucleating agent did not decrease the activity of the catalyst greatly,and did not cause substantial effect on the relative molecular mass and its distribution of the PP product.The relative content of β-crystal in the β-PP product could reach over 85% when the mass fraction of the nucleating agent was 0.08%-0.12% according to the results of wide angle X-ray diffraction（WAXD）.Differential scanning calorimetry（DSC） analysis and mechanical properties test revealed that the crystallization rate of the β-PP was much higher than that of conventional PP without β-nucleating agent,and the β-PP had excellent toughness.

关 键 词：聚丙烯 Β晶型 成核剂 釜内聚合 结晶 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]