PLA/PCL@EBS超细纤维贴肤材料的熔喷制备工艺及其柔软性

Preparation of the PLA/PCL@EBS Microfibrous Skin Cover Microfibrous via Melt Blowing Process and Softness

为开发新型聚乳酸(PLA)基可降解贴肤用超细纤维材料,采用聚乙二醇(PEG)和乙撑双硬脂酸酰胺(EBS)对PLA/聚己内酯(PCL)体系进行共混改性。通过熔喷工艺制备出PLA/PCL@EBS超细纤维材料,并对共混聚合物的热力学特性、样品形貌和柔软性等进行实验分析。结果表明,加入PCL和EBS能够削弱PLA大分子间作用力,提高分子链运动能力,提升材料柔韧性能。此外,当模头温度为216℃时,材料纵向最大拉伸强度为64.42 N,较204℃时增加216%,断裂伸长率提高67%,力学性能大大提高。接收距离(DCD)增大,则提升了材料透气性能,当DCD最大为32 cm时,材料孔隙率与透气率分别为92.4%和327.4 mm/s。最后,模头温度和DCD对柔软度得分的影响规律进行响应面分析,为提高PLA/PCL@EBS熔喷非织造材料在贴肤领域应用提供思路。

In order to develop new biodegradable microfibers based on poly(lactic acid)(PLA)with a skin cover property,PLA/polycaprolactone(PCL)system was modified by blending with polyethylene glycol(PEG)and ethylene bis(stearate)amide(EBS).The PLA/PCL@EBS microfibers were prepared by melt blown,and then the thermomechanical properties,sample morphology,and softness of the blended polymers were experimentally analyzed.The results reveal that the addition of PCL and EBS weakens the intermolecular forces of PLA macromolecules,improves the movement ability of molecular chains,and enhances the flexibility of the microfibers.Moreover,when the die head temperature is 216℃,the microfibers exhibit a maximum longitudinal breaking strength of 64.42 N,which increases 216%comparing to 204℃,as well as the elongation at break increases 67%.Furthermore,increasing the die-to-collector distance(DCD)could improve the permeability of the microfibers.When the maximum of DCD is 32 cm,the porosity and permeability could achieve 92.4%and 327.4 mm/s,respectively.Finally,the effects of die head temperature and DCD on the softness score are analyzed by response surface analysis,which provide insights for enhancing the application of PLA/PCL@EBS meltblown nonwoven materials in the field of skin cover.