第 5 期叶圣涛等.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337 Study on Reinforcement of Millable Polyurethane by Magnesium Methacrylate
Prepared by In-Situ Reaction
YE Shengtao1,CEN Lan1,ZHOU Yanhao1;OUYANG Lunwei2
(1.Guangdong University of Technology,Guangzhou 510006,China;2.Guangzhou Shunli Polyurethane Technology Co.,Ltd,Guangzhou 510006,China)
Abstract: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) cured by peroxide,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 amount of MDMA,the F max-F L 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 the 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.
Key words:millable polyurethane;magnesium dimethacrylate;reinforce;in-situ reaction
●国内外动态●
BKT在德国展出规格为33.00R51的EarthMax SR 46轮胎 美国《现代轮胎经销商》(www. moderntiredealer)2019年3月4日报道:BKT公司在德国慕尼黑的2019年Bauma展上展示两个规格轮胎。
Bauma展是一个国际工程机械、建筑材料机械、采矿机械、施工车辆和施工设备交易会,本次展会于2019年4月8—14日举行。BKT在展会上推出规格为33.00R51的Earthmax SR 46轮胎(见图1),其直径超过3 m、质量不小于2 400 kg,是BKT 有史以来生产的最大规格轮胎。BKT一直在制造轮辋直径为1 244.6 mm(49英寸)的Earthmax SR 46轮胎。
该公司表示,EarthMax SR 46轮胎被设计为“在矿山和大坝等恶劣岩石环境以及大型建筑工地运行的刚性自卸车的创新解决方案”。这款轮胎特别适合运输重物。
美国轮胎此外,由于具有钢丝带束胎体,
EarthMax SR 46
图1 33.00R51 Earthmax SR 46轮胎
轮胎将冲击的影响以及机械应力和刺扎等的损伤程度降至最低,这有效地延长了使用寿命,并最大限度地提高了生产效率。
EarthMax SR 46轮胎的另一个显著特征是特殊的胎面设计,块状胎面花纹有周向花纹沟,可减少外部磨损,同时赋予轮胎出的转弯性能。
BKT非常清楚,轮胎作为机械系统的基本组成部分,能够显著提高其功能和性能。因此,BKT 与大型机械制造商并肩合作,以提供前沿性的解决方案。
(赵 敏摘译 吴秀兰校)
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