使用六亚甲基-1,6-二异氰酸酯(HMDI)、邻苯二甲酸酐(PA)、苯乙烯-甲基丙烯酸甲酯与甲基丙烯酸缩水甘油酯共聚物(KL-E4370)、巴斯夫扩链剂Joncryl?(ADR-4468)、环氧扩链剂、端基环氧基硅油对聚对苯二甲酸乙二醇酯回收料(R-PET)进行扩链改性。研究了单一扩链剂的种类、用量对R-PET的特性黏度、端羧基含量、熔指、结构、结晶性能的影响。结果表明:水分对特性黏度有一定的影响,R-PET经真空干燥后,特性黏度增加了6.54%～12.01%;筛选出ADR-4468为最优扩链剂,当添加质量分数为1.0%时,R-PET的特性黏度由0.48dL/g上升到0.69dL/g,端羧基含量显著降低。
Hexamethylene-1,6-diisocyanate (HMDI),phthalic anhydride (PA),terminal epoxy-based silicone oil,styrene-methyl methacrylate and glycidyl methacrylate copolymer (KL-E4370),ADR-4468 and purchased chain extender were used for the chain extension modification polyethylene terephthalate recycled material(R-PET).The effects of the type and amount of chain extender on the intrinsic viscosity,terminal carboxyl group content melt index,structure and crystallization properties of R-PET were studied.The results shown that water had a certain influence on the intrinsic viscosity.After vacuum drying of R-PET,the intrinsic viscosity increased by 6.54%～12.01%.ADR-4468 was selected as the optimal chain extender.When the addition amount was 1.0%,the intrinsic viscosity of R-PET increased from 0.48dL/g to 0.69dL/g,and the terminal carboxyl group content decreased significantly.
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