以二氧化钛(Ti02)为消光剂,采用钛系催化剂STiC-01或锑系催化剂乙二醇锑,在2L间歇式聚合反应釜中制备半消光PET切片.根据PET切片的特性黏数和色度(L值及b值),比较了催化剂的催化活性,并研究了催化活性的影响因素.结果表明:在相同的聚合工艺条件下,STiC-01的钛用量为5μg/g(相对于PET质量)时的催化活性与乙二醇锑的锑用量为250 μg/g(相对于PET质量)时的相当,PET切片的特性黏数达0.676 dL/g,钛系PET切片的L值高于锑系PET的,b值相当；磷化合物和镁化合物的用量应适当控制；催化剂在酯化前加入,TiO2在酯化后加入,STiC- 01的催化活性不受TiO2的影响；相比乙二醇锑,STiC-01的催化活性受原料质量的影响小.%Using titanium catalyst STiC-01 or an antimony catalyst of ethylene glycol antimony, a semi-dull PET chip was produced on a 2 L batch polymerization reactor with titanium dioxide ( TiO2 ) as a flatting agent. The catalytic activity of these two catalysts were compared according to polyester chips with different intrinsic viscosity and brightness ( Lvalue and b value). The influential factors on the catalytic activity were studied. The results showed that the catalytic activity of STiC- 01 with 5 jlg/g titanium based on polyester mass was equal to that of ethylene glycol antimony with 250 u,g/g antimony based on polyester mass under the same polymerization conditions, the intrinsic viscosity of polyester chips reached 0. 676 dlVg, and titanium catalyst contributed higher L value and equal b value as compared with antimony catalyst; the amount of phosphorus and magnesium compounds should be rationally controlled; the catalysts should be added before esterification, but TiO2 after esteification, and the catalytic activity of STiC-01 was not influenced by TiO2; as compared with ethylene glycol antimony, STiC-01 had the catalytic activity less affected by raw material quality.
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