基于醇解-酯交换法再生PET的固相缩聚  

Solid-state polycondensation of regenerated PET based on the alcoholysis-ester exchange method

作　　者：朱子旭 陈斌杰 官军 吕维扬 王秀华[1] 姚玉元[1,2] ZHU Zixu;CHEN Binjie;GUAN Jun;LU Weiyang;WANG Xiuhua;YAO Yuyuan(National Engineering Lab for Textile Fiber Materials and Processing Technology,Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang Provincial Innovation Center of Advanced Textile Technology,Shaoxing 312030,China;Zhejiang Jiaren New Material Co.,Ltd.,Shaoxing 312000,China)

机构地区：[1]浙江理工大学纺织纤维材料与加工技术国家地方联合工程实验室,杭州310018 [2]浙江省现代纺织技术创新中心,浙江绍兴312030 [3]浙江佳人新材料有限公司,浙江绍兴312000

出　　处：《现代纺织技术》2024年第9期38-47,共10页Advanced Textile Technology

基　　金：浙江省“尖兵”“领雁”研发攻关计划项目(2022C01197);浙江省“尖兵”“领雁”研发攻关计划项目(2023C01203)。

摘　　要：为研究再生聚对苯二甲酸乙二醇酯(CRPET)固相缩聚反应规律及影响因素,在真空条件下,对比分析原生对苯二甲酸乙二醇酯(vPET)和CRPET的固相缩聚反应特征,探究不同端甲基含量和不同尺寸CRPET的固相缩聚反应规律;通过改变反应氛围,在真空和氮气两种反应氛围下分别考察了真空度、氮气流速以及预结晶温度对CRPET特性黏度的影响,对比分析了固相缩聚前后CRPET性能的变化。结果表明:在相同反应条件下,vPET的固相缩聚反应速率大于CRPET;端甲基的存在会阻碍CRPET固相缩聚反应正向进行,但随着温度的升高,这种阻碍逐渐减弱;减小CRPET尺寸或升高反应温度均会提高特性黏度增长速率;CRPET特性黏度在真空条件下比氮气条件下的增量更大;固相缩聚反应在较高氮气流速和真空度下更容易进行;预结晶温度上升会促使固相缩聚反应正向进行,但过高结晶温度会阻碍CRPET内部小分子的扩散逸出,导致特性黏度增长减缓;固相缩聚反应能够提升CRPET的结晶性能,对其热性能影响微弱。High molecular weight(high intrinsic viscosity)polyethylene terephthalate(PET)has excellent mechanical properties,and is an important raw material for the production of high-strength industrial silk,engineering plastics,reinforcement materials and other products.At present,the molecular weight of PET is mainly improved by solid-state polycondensation(SSP)process,which is:the low-molecular weight polymer is heated to above the glass transition temperature and below the melting point,and glycol,water molecules,acealdehyde and other by-products are removed by vacuuming or injecting nitrogen,so that it continues to carry out chain growth reaction in the amorphous region.However,as the production of PET products continues to increase,a large amount of oil resources are consumed.To solve this problem,the researchers carried out research on the regeneration methods of PET,among which,the chemical regeneration of PET(CRPET)based on glycol alcohololysis and methanol transesterification process can meet the requirements of high-quality regeneration.Nowadays,CRPET has been industrialized in the field of flame-retardant modification,cationic dyeing and other civil grade fibers,but there are few reports on the preparation of CRPET with high molecular weight(high intrinsic viscosity).In order to achieve the preparation of high molecular weight CRPET,solid-state polycondensation process was used to increase the viscosity of CRPET.Under vacuum conditions,the solid-state polycondensation reaction characteristics of vPET and CRPET were compared.The intrinsic viscosity of CRPET during solid-state polycondensation was investigated by changing the methyl group content,size,reaction atmosphere,vacuum,nitrogen flow rate and pre-crystallization temperature.The results show that under the same reaction conditions,the solid-state polycondensation rate of vPET is higher than that of CRPET.The presence of terminal methyl group can affect the rate of CRPET solid-state polycondensation,but this effect gradually decreases with the increase of

关 键 词：再生PET 化学法再生 固相缩聚 特性黏度 反应条件 端甲基 

分 类 号：TQ342.21[化学工程—化纤工业]