高相对分子质量PET降解速率研究

从涤纶工业丝纺丝装置上在线取样 ,研究不同温度下PET特性粘数与停留时间的关系。通过对实验值的拟合 ,给出了描述PET特性粘数与停留时间的关系的数学模型和以特性粘数表征的降解速率方程。结果表明 ,相对分子质量越大 ,温度越高 ,降解越快。根据数学模型得出的熔体允许停留时间 ,可以确定相匹配的产品规格与设备参数 ,在纺丝过程中应分段控制温度。

Study on degradation rate of high-relative molecular mass PET

The relationship between intrinsic viscosity and residence time of PET taken on-line from a PET industrial yarn spinning plant was studied at different temperatures. The mathematical model simulating the relationship between intrinsic viscosity and residence time of PET and the degradation rate equations characterized by intrinsic viscosity were obtained by experimental data fitting. The results showed that the higher relative molecular mass and the temperature were,the higher degradation rate of high-relative molecular mass PET was. The product specification and equipment parameters can be determined according to the melt residence time allowance obtained from the mathematical model. The temperature should be controlled by steps during spinning.