PTT合成放大实验及其纺丝性能研究

PTT synthesis scale-up experimentation and spinning property characterization

在聚对苯二甲酸丙二醇酯(PTT)合成的小试研究基础上,进行了在20 L熔融缩聚反应釜中合成PTT的放大实验,并进行了PTT纺丝实验。结果表明:合成得到的PTT特性黏数为0.89 dL/g,端羧基含量为48μmol/g,3,3-氧基二丙醇质量分数为0.46%,玻璃化转变温度为45℃,熔点为228℃。PTT初步达到纤维级别的要求,在400 m/min的速度下能够顺利纺丝,经过2.5倍拉伸后,纤维线密度为96.7 dtex,断裂强度为1.3 cN/dtex,断裂伸长率为97.35%,模量为2.7 cN/dtex。

The scale-up experimentation of polytrimethylene terephthalate（FIT） synthesis was carried out in a 20-L melting polycondensation reactor based on the small-scale experimentation. The spinning experiment was also conducted for FI＇T. The results showed that the obtained PTT possessed the intrinsic viscosity of 0.89 dL/g, terminal carboxyl group content 48 μmol/g, 3, 3-dipropylene glycol mass fraction of 0.46%, glass transition temperature 45 ℃ and melting point 228 ℃ ; and the obtained PTT basically satisfied the fiber-grade requirement, which can be spun at 400 m/min and drawn at 2.5 time to produce the fibers with the linear density 96.7 dtex, breaking strength 1.3 cN/dtex, elongation at break 97.35% and modulus 2.7 cN/dtex.