王云红,罗 贤,张宝林,雷军庆

高流动抗冲共聚聚丙烯专用料的结构与性能分析

王云红1,罗 贤2,张宝林1,雷军庆1

(1.中国石油独山子石化分公司研究院,新疆独山子833600;2.北京理工大学材料学院,北京100081)

采用核磁共振、动态力学分析、差示扫描量热、流变性能等测试方法对国内外几种高流动抗冲共聚聚丙烯的力学性能与加工性能进行了分析。结果表明,1#样品具有较高的乙烯含量,等规度较高,二甲苯可溶物较低,均聚相与共聚相具有较好的相容性,具有最好的综合力学性能。3#样品的PE结点含量和乙烯含量均较高,因而具有最高的冲击强度。4#、5#样品具有较宽的相对分子质量分布,在高剪切速率下具有较好的加工性能。高流动抗冲共聚聚丙烯专用树脂中应含有较多的乙丙橡胶链段,均聚相要具有较高的等规指数,两相相容性要好,且相对分子质量分布要稍宽,这样才能具有良好的加工性能,同时可以提高成型制品的尺寸稳定性。

共聚聚丙烯;高流动性;高抗冲;结构;性能

Abstract:Several propylene copolymers with high impact and high flowability were characterized using nuclear magnetic resonance,dynamic mechanical analysis,differential scanning calorimeter,and rheological properties.Sample 1#had higher ethylene content,higher isotacticity and lower xylene solubility,the homopolymer and copolymer phases showed good compatibility,and provided the best comprehensive mechanical properties.Sample 3#had higher content of PE nodes and ethylene,so it possessed the highest impact strength.Sample 4#and 5#had a wide molecular weight distribution and displayed good processing property at high shear rates.The comparison showed that propylene copolymers with high impact strength and high flowability should contain a high fraction of ethylene-propylene rubber segments,a high isotactic index in the homopolymer phase,and a good compatibility between the two phases.Molecular weight distribution should be moderately wide,so that good processing behavior could be obtained,and dimensional stability of the products could be increased.

Key words:propylene copolymer;high flowability;high impact strength;structure;property

0 前言

高流动抗冲共聚聚丙烯是近年来国内开发的一种新型高分子材料,适合注射成型薄壁制品,具有冲击强度高、表面性能好的特点,一般由共聚反应获得,也可通过共混改性制得。该类树脂成型收缩率调节范围宽,可直接在丙烯腈-丁二烯-苯乙烯共聚物或高抗冲聚苯乙烯使用的模具上注射成型,制品表面可以进行消光、珠光或直接喷涂处理。产品主要应用于纤维、涂覆、洗衣机零部件、汽车零部件、家电外壳等。……