双氧水/抗坏血酸引发甲基丙烯酸甲酯接枝改性锦纶6织物及其性能

针对长时间光照下锦纶6织物白度下降的问题,采用双氧水/抗坏血酸(H₂O₂/H₂A)引发甲基丙烯酸甲酯(MMA)接枝改性锦纶6,研究了接枝时间、接枝温度、引发剂质量分数和单体浓度对接枝率的影响,并对接枝改性前后织物的微观形貌、化学结构、白度和服用性能进行表征。结果表明:最佳接枝工艺为接枝温度70 ℃,接枝时间60 min,引发剂H₂O₂/H₂A质量分数30%,MMA浓度1.5 mol/L;接枝改性后锦纶6织物表面变得粗糙,附有小颗粒状物质;在紫外光下照射8 h后,接枝改性锦纶6织物的白度由未改性的58.6提高至70.53,表现出优良的耐光性能,且硬挺度由10.7增加至23.6,光滑度由71.7增加至80.3,可保持良好的服用性能。

Grafting modification of polyamide 6 fabric with methyl methacrylate initiated by hydrogen peroxide/ascorbic acid and its properties

In order to tackle the whiteness declination of polyamide 6 fabric after prolonged light exposure, methyl methacrylate (MMA) was grafted onto polyamide 6 (PA6) via hydrogen peroxide/ascorbic acid(H₂O₂/H₂A) as initiator. The effects of grafting time, grafting temperature, initiator and monomer concentration on grafting rate were studied, and the micro morphology, chemical structure, whiteness and wearability of the grafted fabric were characterized. The optimal process conditions were identified as follows: grafting temperature 70 ℃, grafting time 60 min, initiator H₂O₂/H₂A mass fraction 30%, MMA concentration 1.5 mol/L. The fabric surface became rough after grafting with small granular materials. The whiteness index of the modified fabric increased from the previous 58.6 to 70.53 after UV irradiation for 8 h, showing excellent light resistance. The stiffness index of the modified fabric increased from 10.7 to 23.6, and the smoothness increased from 71.7 to 80.3, both contributing to good wearability.