大型中空容器级高密度聚乙烯树脂的合成与性能

Synthesis and properties of high density polyethylene resin used for large hollow container

采用单釜淤浆聚合工艺合成出大型中空容器用高密度聚乙烯(HDPE)专用树脂,并对聚合物的力学性能、结晶性能及相对分子质量分布进行了分析表征。结果表明,氢气分压由0.4 MPa增加到0.8 MPa时,HDPE的熔体流动速率由0.141 8 g/min升高至2.008 8 g/min;1-己烯质量分数由1%增加到3%时,HDPE的密度由951.8 kg/m3降至916.9 kg/m3,熔点由134.90℃降至133.54℃;使用催化剂J可制得重均相对分子质量与数均相对分子质量之比值较大(18.40～46.05)且呈单峰或双峰分布的HDPE。

A large hollow container grade high density polyethylene （ HDPE ） resin was synthesized by single reactor - slurry polymerization, and the me- chanical properties, crystallinity and molecular weight distribution of the resin were characterized. The results showed that with increasing the hydrogen partial pressure from 0.4 MPa to 0.8 MPa, the melt flow rate of the product increased from 0.14 g/rain to 2.01 g/min. When the mass fraction of 1 - hexene in-creased from 1% to 3%, the density of the product decreased from 951.8 kg/m3 to 916.9 kg/m3, and melting point from 134.90 ℃ to 133.54 ℃. HDPE which had wide unimodal or bimodal molecular weight distribution （ 18.40 - 46.05 ） could be ob- tained using self - made catalyst J.