聚丙烯纤维料树脂对无纺布性能的影响研究

目的 研究聚丙烯原料对无纺布的力学和加工性能的影响规律，从而制备出力学性能高、纺丝性能好的无纺布。方法 以不同熔融指数的聚丙烯粉料为基础树脂，使用不同的过氧化物与其进行共混熔融挤出造粒，然后采用气相色谱、高温凝胶渗透色谱、拉伸等测试手段对样品的基础物性、分子结构、气味、VOC、残留物和无纺布的力学性能及加工稳定性等方面进行表征与分析。结果 以熔融指数8 g/10 min(GB/T 3682.1—2018)的粉料为基础树脂，加入少量的3,6,9-三甲基-1,4,7-三过氧壬烷，挤出造粒制备出的4号树脂原料样品。该样品具有高的熔体流动性(MFR为35~40 g/10 min)、窄的分子量分布(3~5)、低灰分和鱼眼数、低气味、低残留的过氧化物等性能，从而制成拉伸强度高、纺丝效率高且加工稳定的无纺布成品。结论 基础聚丙烯树脂的分子量设计、原料的配方体系、工艺路线都对无纺布制品的力学性能和可纺性产生重要影响。

Effect of Polypropylene Fiber Resin on the Properties of Non-woven Fabrics

The work aims to study the effect of polypropylene raw materials on the mechanical and processing properties of non-woven fabrics, so as to prepare non-woven fabrics with high mechanical properties and good spinning properties. Polypropylene powder with different melt indexes was used as the base resin and mixed with different peroxides for melt extrusion granulation. The basic physical properties, molecular structure, odor, VOC, residue and mechanical properties and processing stability of the samples were characterized and analyzed by gas chromatography, high temperature gel permeation chromatography, tensile test, etc. No. 4 resin raw material sample prepared by extrusion granulation with a small amount of 3,6,9-trimethyl-1,4,7-triperoxynonane in the powder with a melt index of 8 g/10 min (GB/T 3682.1-2018) had high melt fluidity (MFR of 35-40 g/10 min), narrow molecular weight distribution (3-5), low ash content and fish eye count, low odor, and low residual peroxides, resulting in non-woven fabric products with high tensile strength, high spinning efficiency and stable processing. The molecular weight design of basic polypropylene resin, the formulation system of raw materials, and the process route all have a significant effect on the mechanical properties and spinnability of non-woven fabric products.