摘要
在高温熔融及氧气环境下,聚苯硫醚(PPS)易氧化交联,流动性降低;0.89 dtex细旦纤维纺丝过程中纤维比表面积急剧增大导致丝束快速结晶,纤维牵伸性能恶化。为解决PPS树脂高温易氧化及结晶速率过快等难题,采用间接法纺制0.89 dtex细旦纤维,生产全过程氮气保护。研究了在造粒过程中氮气对氧化交联的影响,结晶温度对原丝初始拉伸张力1.5倍时伸长率(EYS1.5)的影响,熔体流动性能对纺丝成形的影响以及后道牵伸倍率和定型温度对纤维耐化学性能的影响。结果表明,PPS氮气保护下切片在傅里叶变换红外光谱图上未出现砜基及亚砜基峰,未氮气保护切片出现明显的砜基及亚砜基峰。当结晶温度在215~220℃时,初生纤维EYS1.5为150%~160%,拉伸性能最佳。组件海砂粒径及过滤网组合孔径分别为250μm,830/58/42/270μm时,断丝次数在2次/h,组件压力控制在12 MPa,生产稳定。总牵伸倍率在3.8,第二段倍率分配85%,纤维断裂强度和断裂伸长率为5.02 cN/dtex和30.1%。紧张及松弛定型温度分别在185℃及135℃,耐酸性及碱性强力保持率在97.5%及97.9%,纤维收缩率控制在4.5%以下,具有较高的织布尺寸稳定性。制成的细旦纤维与2.22 dtex粗旦纤维混纺,细旦纤维质量分数由0%增至100%时,织布透气率由160 L/(dm^(2)·min)下降到90 L/(dm^(2)·min),滤袋过滤性能提升明显。本研究为0.89 dtex细旦纤维熔体可纺性、力学性能、耐化学性及收缩率等性能指标控制提供了可行的工艺方案。
Under high-temperature melting and oxygen environments,polyphenylene sulfide(PPS)is prone to oxidative cross-linking,leading to reduced fluidity;during the spinning of 0.89 dtex fine-denier fibers,the rapid increase in the specific surface area of the fibers results in accelerated crystallization of the filament bundle,worsening the fiber drawability.To address these challenges of PPS resin's susceptibility to oxidation at high temperatures and excessively fast crystallization rates,the entire production process was conducted under nitrogen protection,and 0.89 dtex fine-denier fibers of PPS were produced using an indirect spinning method.The study investigated the effect of nitrogen on oxidative cross-linking during pelletization,the influence of crystallization temperature on the elongation at 1.5 times the initial tensile load(EYS1.5),the impact of melt fluidity on spinnability,and the effects of the post-draw ratio and heat-setting temperature on chemical resistance.The results show that PPS chips protected by nitrogen show no peaks for sulfone or sulfoxide groups in the FTIR spectrum,whereas unprotected chips exhibit distinct peaks for these groups.At a crystallization temperature of 215-220℃,the elongation of EYS1.5 of the as-spun fibers reached 150%-160%,indicating optimal drawability.With a sand filter particle size of 250μm and a filter screen combination aperture(830,58,42μm and 270μm),filament breakage is limited to 2 times/h and the pack pressure was controlled at 12 MPa,ensuring stable production.With a total draw ratio of 3.8 and 85%allocation to the second stage,the fiber exhibited a tenacity of 5.02 cN/dtex and an elongation of 30.1%.With tension and relaxation heat-setting temperatures of 185℃and 135℃,respectively,the fiber exhibited acid and alkali resistance strength retention rates of 97.5%and 97.9%,shrinkage controlled belows 4.5%,indicating high dimensional stability in fabrics.When the produced fine-denier fibers are blended with 2.22 dtex coarse-denier fibers,increasing the mass ratio of the fine-denier fibers from 0%to 100%reduced the fabric air permeability from 160 L/(dm^(2)·min)to 90 L/(dm^(2)·min),significantly enhancing the filtration performance of the filter bag.This study provides a feasible technical pathway for controlling the key performance indica‐tors of 0.89 dtex fine-denier PPS fibers,including melt spinnability,mechanical properties,chemical resistance,and shrinkage.
作者
俞孟飞
黄平
陈小锋
YU Mengfei;HUANG Ping;CHEN Xiaofeng(Shaoxing Yuchen New Materials Co.,Ltd.,Shaoxing 312000,China)
出处
《工程塑料应用》
北大核心
2025年第11期33-40,共8页
Engineering Plastics Application
关键词
细旦
EYS1.5
透气率
氮气保护
结晶温度
fine denier
EYS1.5
air permeability
nitrogen protection
crystallization temperature
