车用多层共挤尼龙管含水率对机械性能的影响  

Effects of Water Content of Vehicle Multi-layer Co-extrusion Nylon Pipe on Mechanical Properties

作　　者：朱建 薛长鸣 罗英哲 张宸睿 ZHU Jian;XUE Changming;LUO Yingzhe;ZHANG Chenrui(Shanghai Chinaust Automotive Plastic Co.,Ltd.,Shanghai 201708,China)

机构地区：[1]上海亚大汽车塑料制品有限公司,上海201708

出　　处：《汽车零部件》2022年第5期50-53,共4页Automobile Parts

摘　　要：尼龙材料易吸湿,吸湿后尼龙材料抗冲击性能提高,但是强度指标会衰减。本文对某款外层PA612多层共挤5层尼龙管的机械性能进行试验分析。结果表明:室温爆破强度随多层尼龙管含水率升高而下降;当含水率小于0.6%,耐压性能基本不受影响;多层尼龙管存在吸湿滞后性,放湿到含水率平衡的含水率数值要高于吸湿到含水率平衡数值;外层低吸水率PA612多层尼龙管的每层层厚设计时,常温吸湿耐压值的安全系数取1.8~2。Nylon material is easy to absorb moisture.After moisture absorption,the impact resistance of nylon material is improved,but the strength index is decline.The mechanical properties of co-extrusion five-layer pipe with PA612 out layer was analyzed.The results show that room temperature burst pressure decreases with increased water content of multi-layer nylon pipe.When the water content is less than 0.6%,the pressure resistance performance is basically not affected.Multi-layer nylon tube has hygroscopic hysteresis,and the water content value of moisture releasing to water content equilibrium is higher than that of moisture absorption to water content equilibrium.When the thickness of each layer of PA612 multilayer nylon pipe with low water absorption of outer layer is designed,the safety coefficient of pressure resistance value of moisture absorption is 1.8~2 under ambient temperature.

关 键 词：多层尼龙管 含水率 耐压强度 

分 类 号：U465.4[一般工业技术—材料科学与工程]