CAJ | 학술논문

聚合物原料的高温拉伸过程是塑料土工格栅生产的关键环节,高温拉伸工艺参数的选取对土工格栅制品的使用性能有重要影响.通过“高温室温两步拉伸”试验方法,对塑料土工格栅用聚丙烯原料先进行高温拉伸,冷却至室温后再测试其室温拉伸性能,得到高温时拉伸温度、拉伸速率和拉伸比等参数对聚合物高温和室温拉伸性能的影响规律.结果表明：随着拉伸温度的升高和拉伸速率的降低,聚丙烯原料高温流变应力明显下降,而拉伸比对高温应力应变曲线影响较小；聚丙烯原料经高温拉伸处理后,在室温下断裂伸长率随高温拉伸时的温度升高而明显增加,而受高温拉伸速率的影响不大；高温拉伸时的温度、速率和拉伸比均存在一个合理区间,在该试验条件下,高温拉伸温度为110~130℃,拉伸速率为100~250 mm.min－1,拉伸比为8~13时,聚合物材料呈现最佳室温拉伸性能.
취합물원료적고온랍신과정시소료토공격책생산적관건배절,고온랍신공예삼수적선취대토공격책제품적사용성능유중요영향.통과“고온실온량보랍신”시험방법,대소료토공격책용취병희원료선진행고온랍신,냉각지실온후재측시기실온랍신성능,득도고온시랍신온도、랍신속솔화랍신비등삼수대취합물고온화실온랍신성능적영향규률.결과표명：수착랍신온도적승고화랍신속솔적강저,취병희원료고온류변응력명현하강,이랍신비대고온응력응변곡선영향교소；취병희원료경고온랍신처리후,재실온하단렬신장솔수고온랍신시적온도승고이명현증가,이수고온랍신속솔적영향불대；고온랍신시적온도、속솔화랍신비균존재일개합리구간,재해시험조건하,고온랍신온도위110~130℃,랍신속솔위100~250 mm.min－1,랍신비위8~13시,취합물재료정현최가실온랍신성능.
The high temperature stretching process of polymers is a crucial portion in the production of plastic geogrid,and the high temperature tensile parameters have important effects on the operation performances of plastic geogrid.By using high temperature and room temperature two-step tensile method,the polypropylene was firstly stretched at elevated temperature,and then the room temperature mechanical properties of the gained polypropylene samples were tested when they were cooled.The effects of tensile temperature,tensile rate,and tensile ratio at elevated temperature on high temperature and room temperature mechanical properties of polypropylene were studied.The results show that the high temperature stress decreased obviously with the increase of tensile temperature and decrease of tensile rate.However,the influence of tensile ratio was not evident.The percentage elongation after fracture at room temperature increased as the tensile temperature increased,while there was no notable variation with different tensile rates at elevated temperature.There were proper ranges for high temperature tensile temperature (1 10-130 ℃),tensile rate (100-250 mm.min-1 )and tensile ratio (8~13)in order to make the polypropylene present excellent performances.