摘要
研究了液相增黏熔体直纺技术中,高黏聚酯熔体可纺性能。研究表明,对于降膜式液相增黏反应器,传质的速率、传热的均匀性以及熔体热历史的一致性是影响聚酯可纺性以及物性指标的重要因素。分子量的增大使得聚酯分子链难以展开和伸直,甚至不完全取向,运动黏度剧增,熔体输送困难,在经过管道时的温升、降解严重。聚酯分子的分子量分布越窄,低相对分子量组分含量越低,越有利于纺丝。在降膜式液相增黏反应器中,由于成膜表面更新速率,以及熔体沿管壁下降的速率分布不均,导致PET分子量分布变宽,端羧基含量增大。液相增黏熔体直纺过程,是PET熔体在热量和应力的作用下,结晶和取向的过程。取向使聚酯分子产生强度,而结晶则使已取向的分子更稳定,降低体系的熵值。
The spinnability of high-viscosity polyester prepared by liquid tackifying technology was studied. Study show that for the dropping film liquid tackifying actor, mass transfer rate, heat Transfer uniformity and heat history consistency have important effect on spinnability and the properties of yarn. With the molecular weight increasing, it is difficult to straighten for molecular chain, kinematic viscosity augment a lot, melt fluidity became bad, melt temperature raised and the melt degraded when it through the pipeline. MWD is narrower, its spinnability was better. MWD became wider and the end carboxyl content increased during the tackifying process since the differences of refreshing rate of film forming and the dropping rate of the melt. In the direct-spiIming process, crystallization and orientation occur. The transformations improve fiber＇s strength and stability respectively. The entropy decrease.
出处
《广东化工》
CAS
2014年第7期82-83,共2页
Guangdong Chemical Industry
关键词
液相增黏
高黏聚酯熔体
可纺性
liquid tackifying： high-viscosity polyester melt： spinnability
