β成核剂对PPR管材专用树脂性能的影响

Effect of β nucleating agent on properties of special PPR resin for pipes

制备了β晶型无规共聚聚丙烯(PPR)管材专用树脂,并研究了5种不同β成核剂对β晶型PPR性能的影响。结果表明:β晶型PPR的性能与β成核剂的种类和加入量相关。当β成核剂E的质量分数为0.20%时,β晶型PPR的β晶含量达80%以上,简支梁缺口冲击强度达100 k J/m2。β成核剂C对β晶型PPR负荷变形温度影响最大,能使其升至76℃左右。分别加入β成核剂A,B,C,D,则β晶型PPR断裂伸长率均增加20%。综合考虑,加入β成核剂E能满足β晶型PPR对抗冲击性能和耐热性能的要求。

Polypropylene random copolymer （PPR） for pipes with β crystal form structure was prepared and the influences of five different β nucleating agents on properties of the β crystal form PPR were studied. The results indicate that properties of the β crystal form PPR depend on the type and amount of β nucleating agents. The content of β crystal form structure is over 80% and the Charpy notched impact strength reaches 100 kJ/m2 when the mass percentage of E nucleating agent is 0.20%. C nucleating agent has the greatest impact on the distortion temperature under load of the β crystal form PPR, and the distortion temperature under load increases to about 76 ℃ with C nucleating agent. The tensile elongation at break is increased by 20% when A, B, C or D nucleating agent is added respectively. The addition of E nucleating agent is thought to be suitable to satisfy the requirements of impact and heat resistance of the β crystal form PPR after overall consideration.