CAJ | 학술논문

哈齐高速铁路穿越高寒地区，铁路扣件保持轨距的能力对于运营安全和运营成本非常重要。铁路扣件绝缘轨距块以玻璃纤维(33%含量)增强聚酰胺66体系( PA66-GF33体系)作为原材料，在原材料中添加增韧剂来改善绝缘轨距块低温下的力学性能。本文研究增韧剂(马来酸酐接枝三元乙丙橡胶)含量变化对 PA66-GF33体系在常温下力学性能的影响，及其在－30℃和－50℃环境下缺口冲击强度的变化。研究结果表明：原材料中增韧剂含量由3%增加到12%时，缺口冲击强度增大，拉伸强度、弯曲强度和熔融指数降低，扫描电镜分析显示缺口冲击试验的样条断面由脆性断裂逐渐表现为韧性断裂；当增韧剂含量为6%时，PA66-GF33体系同时具有较好的低温韧性和优良的加工性能，选择增韧剂含量为6%的 PA66-GF33体系作为绝缘轨距块原材料，采用注塑工艺制备的绝缘轨距块剖面无内部空隙，并且在－45℃环境下冲击强度试验合格。
합제고속철로천월고한지구，철로구건보지궤거적능력대우운영안전화운영성본비상중요。철로구건절연궤거괴이파리섬유(33%함량)증강취선알66체계( PA66-GF33체계)작위원재료，재원재료중첨가증인제래개선절연궤거괴저온하적역학성능。본문연구증인제(마래산항접지삼원을병상효)함량변화대 PA66-GF33체계재상온하역학성능적영향，급기재－30℃화－50℃배경하결구충격강도적변화。연구결과표명：원재료중증인제함량유3%증가도12%시，결구충격강도증대，랍신강도、만곡강도화용융지수강저，소묘전경분석현시결구충격시험적양조단면유취성단렬축점표현위인성단렬；당증인제함량위6%시，PA66-GF33체계동시구유교호적저온인성화우량적가공성능，선택증인제함량위6%적 PA66-GF33체계작위절연궤거괴원재료，채용주소공예제비적절연궤거괴부면무내부공극，병차재－45℃배경하충격강도시험합격。
Harbin-Qiqihar high speed railway crosses through the frigid area and the track gauge of railway fasteners is important to railway operation safety and cost. T he insulation gauge block material of railway fasteners is glass fiber reinforced polyamide 66 ( Glassfiber content:33%) and addition of toughening agent in the raw material would improve the mechanical properties of insulation gauge block in low-temperature. T his paper studied the influence of toughening agent ( EPDM-g-MAH,maleic anhydride grafted Ethylene-Propylene-Diene Monomer) content on mechanical properties of PA66-GF33 under normal temperature and changes of notched impact strength under-30 ~ -50 ℃ condition. T he results showed that notched impact strength increases and the tensile strength,bending strength and melt index decreases when the EPDM-g-M AH content is from 3% to 12%,the scanning electron microscope ( SEM ) observation indicates that sample piece cross section is from brittle fracture to ductile fracture gradually in notch impact test,PA66-GF33 exhibits good low temperature toughness and excellent processing performance with 6% EPDM-g-M AH content,PA66-GF33 as raw materials of insulation gauge block with 6%EPDM-g-M AH content,insulation gauge block section of which has no internal voids by injection molding processing,is qualified by impact strength test under -45 ℃ environment.