固相法低氯含量氯化聚乙烯的合成与性能研究

本工作采用搅拌式固相法两段氯化研究了氯含量为8～25％的氯化聚乙烯的性能。结果表明:氯含量相同时,两段氯化程度比值减小,结晶度降低,断裂伸长率上升,撕裂强度下降,熔体指数增大;拉伸强度随两段氯化程度比的改变,都出现高峰值和最低值,出现峰值时的两段氯化比值取决于产物氯含量;第二段氯化程度高,溶解剩余值变小,热分解温度增高,透光性能变优。两段氯化程度比不变。总氯含量增高,产物的结晶度、断裂伸长率、撕裂强度、熔体指数、溶解剩余值和热分解温度降低,透光率提高;拉伸强度则随氯含量增加出现最低值,然后上升出现高峰值,此值不同,出现最低值时的氟含量不同,两段氯化比值为9的氯含量为20％的LCPE,其拉伸强度最高。

低氯含量清净分散剂研究新进展

介绍了近几年国内外对降低润滑油添加剂中氯含量的研究进展,详细描述了Lewis酸、无机酸及pKa大于2的有机酸法、碘和溴离子法和硫化法及其除氯效果,并介绍了清净分散剂无氯生产的新工艺。针对我国添加剂生产现状和未来发展趋势提出了建议。

高热稳定性低氯聚苯砜树脂合成及表征

结合缩聚方法和封端修饰方法合成苯酚封端的聚苯砜(PPSU)树脂,利用离子色谱方法对PPSU树脂的氯端基含量进行定量测试,并采用毛细管流变仪和高温注塑等方法对比评估了不同氯端基含量PPSU树脂的热稳定性和颜色。结果表明,通过苯酚封端,PPSU树脂的氯端基含量可由3000 mg/kg以上降至700 mg/kg以下,氯端基含量取代比例可达80.6%,同时PPSU树脂的力学性能未发生明显变化,拉伸强度、屈服点伸长率、弯曲强度和缺口冲击强度分别保持在73 MPa,89%,114 MPa和50 kJ/m^(2)左右,并且PPSU树脂的热稳定性得到一定程度提高,颜色等级有所改善。

Oligomerization of 1-Decene: Catalyzation by Immobilized AlCl_3/γ-Al_2O_3 Catalyst in Fixed-bed Reactor

1-Decene was oligomerized over the supported AlCl3/γ-Al2O3 catalyst in a fixed-bed reactor. The effects of temperature and LHSV on oligomerization of 1-decene were investigated and the synthetic PAO was characterized with GC technique. Furthermore, the life of immobilized catalyst was tested and the mechanism of catalyst deactivation was discussed. The results showed that with an increasing temperature, the PAO yield increased and the kinematic viscosity of oil decreased. The GC results indicated that the synthesized PAO was a mixture consisting of dimers, trimers, tetramers and pentamers. The results of chloride content measurements and BET tests showed that catalyst deactivation could be mainly attributed to the loss of active components.