无纺布专用聚酯切片生产工艺探讨

Production process of special polyester chip for nonwovens

在200kt／a常规聚酯生产装置上，转产高黏度无纺布专用聚酯切片，探讨了其生产工艺条件。结果表明：在常规聚酯生产工艺基础上，控制原料质量，提高锑系催化剂浓度20～30μg／g，控制预过滤器压差为0．1MPa，适当提高酯化温度、酯化压力、乙二醇摩尔比，以及缩聚温度和缩聚搅拌转速，生产的无纺布专用料特性黏数达0．702dL／g，相比常规聚酯，色度L值降低1．5～2．0，b值升高1．0～1．5，二甘醇质量分数升高0．1％，但仍达到优等品质量要求；专用料经用户试用，明显改善针刺工艺无纺布质量。

The process conditions for high-viscosity polyester chip for nonwovens were discussed on a 200 kt/a conventional polyester plant. The results showed that the special polyester chip for nonwovens can be produced with the intrinsic viscosity up to 0. 702 dL/g by strictly controlling the raw material quality, increasing the concentration of antimony-containing catalyst by 20 - 30 μg/g, controlling the pre-fiher pressure difference as 0.1 MPa and properly increasing the esterification temperature and pressure, glycol mole ratio, polycondensation temperature and stirring speed based on the conventional polyester production process ; as compared with traditional polyester chip, the special polyester chip for nonwovens had a decrease of L value of chroma by 1.5 - 2.0, an increase of b value by 1.0 - 1.5 and a growth of 0.1% in diethylene glycol mass fraction, but still satisfied the top-quality standard; and the produced special polyester chip was proved to be beneficial to bettering the quality of needlepunched nonwovnes by trial application.