原位反应生成的甲基丙烯酸镁对混炼型聚氨酯补强的研究

在混炼型聚氨酯（MPU）（过氧化物作硫化剂）混炼过程中，氧化镁（MgO）与甲基丙烯酸（MAA）原位反应生成甲基丙烯酸镁（MDMA），研究其对MPU的补强作用。结果表明：当MDMA理论生成量为30份时，随着MgO/MAA物质的量比的增大，MPU硫化胶的拉伸强度先增大后减小，在MgO/MAA物质的量比为0.6时，拉伸强度达到最大值，综合物理性能最佳；当MgO/MAA物质的量比为0.6时，随着MDMA理论生成量增大，混炼胶的Fmax－FL显著提高，MPU硫化胶的拉伸强度先增大后减小，玻璃化温度向低温移动，耐低温性能提高，在MDMA用量为30份时，拉伸强度达到最大值，填料网络结构较稳固。;Magnesium methacrylate（MDMA）was synthesized by in situ reaction of magnesium oxide （MgO）and methacrylic acid（MAA）in the mixing process of millable polyurethane（MPU）（peroxide as vulcanizing agent），and its reinforcing effect on MPU was investigated.The results showed that：When the theoretical amount of MDMA was 30 phr，with the increase of MgO/MAA moral ratio，the tensile strength of MPU vulcanizate increased first and then decreased.When the moral ratio of MgO/MAA was 0.6，the tensile strength reached the maximum value and the comprehensive physical properties were the best.When the moral ratio of MgO/MAA was 0.6，with the increase of the theoretical production of MDMA，the Fmax－FL of the blend increased significantly，the tensile strength of MPU vulcanizate increased first and then decreased，the glass transition temperature moved to low temperature and the low temperature resistance of vulcanizate was improved.When the amount of MDMA was 30 phr, the tensile strength reached the maximum value and the filler network structure was stable