滚塑成型材料粉末流动性的影响因素

Influencing factors of powder flowability of rotational molding materials

基于标准GB/T 40934—2021的制订要求,对影响滚塑成型材料粉末流动性测试影响因素进行了研究,并给出了滚塑成型用粉末的精密度数据和质量判断准则。结果表明,影响粉末流动性测试的敏感性因素为,流出口直径>>样品温度=取样量≈含水率>>状态条件时间,其中流出口直径是影响测试准确性的最主要因素;粉末流动性数值越大,对测试条件变化的敏感性越强,表现为变异系数增大;表观密度和粉体流动性之间仅存在较弱的负相关关系。

Based on the requirements of GB/T 40934—2021,the influencing factors for the powder flowability test of ro⁃tational molding materials were investigated,and the precision data and quality judgment criteria of powders for rotational molding were presented.The results indicated that the influencing factors for the sensitivity of powder fluidity test were obtained by an order of outlet diameter>>sample temperature=sampling amount≈moisture content>>state con⁃dition time.In these factors,the outlet diameter was the most important factor for the accuracy of test.The greater the value of powder fluidity,the stronger was the sensitivity to the change of test conditions,indicating an increase in the co⁃efficient of variation.There was only a weak negative correlation between the apparent density and powder fluidity.