氢氧化镁表面改性及在EVA中的应用  

Surface Modification of Magnesium Hydroxide and Its Application in EVA

作　　者：刘伟强 马亚丽 衣思敏 张金帅 郑强 贾松岩 樊君玲 李雪 LIU Weiqiang;MA Yali;YI Simin;ZHANG Jinshuai;ZHENG Qiang;JIA Songyan;FAN Junling;LI Xue(School of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Liaoning Engineering Research Center of Magnesium and Calcium Inorganic Functional Materials,Shenyang 110142,China;Shenyang Key Laboratory of Magnesium and Calcium Resources Utilization,Shenyang 110142,China;Liaoning Dong'an Safety Technology Consulting Service Co.,Ltd.,Shenyang 110004,China)

机构地区：[1]沈阳化工大学化学工程学院,辽宁沈阳110142 [2]辽宁省镁钙无机功能材料工程研究中心,辽宁沈阳110142 [3]沈阳市镁钙资源利用技术重点实验室,辽宁沈阳110142 [4]辽宁东安安全技术咨询服务有限公司,辽宁沈阳110004

出　　处：《塑料工业》2023年第7期107-114,共8页China Plastics Industry

基　　金：2020-2022年辽宁省普通本科高等学校校际合作项目(辽教发【2020】28号文件),2021-2023年辽宁省科技厅,创新能力提升联合基金(2021-NLTS-12-04),辽宁省自然科学基金计划项目(2022-BS-210)。

摘　　要：以轻烧粉蒸氨-沉镁制得的氢氧化镁(MH)粉末为研究对象,采用油酸和硬脂酸作为MH表面改性剂,通过对比MH改性前后的吸油值和活化指数发现油酸和硬脂酸的最佳改性工艺条件分别为:油酸用量4%(相对MH粉末质量),改性时间为50 min,改性温度为70℃;硬脂酸用量4%(相对MH粉末质量),改性时间为40 min,改性温度为50℃。通过利用改性前后MH的傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)和热重分析(TG-DTG)、扫描电子显微镜(SEM)、水接触角等表征手段及改性MH在乙烯-醋酸乙烯酯共聚物(EVA)中的添加效果分析对比,结果发现用油酸和硬脂酸对MH改性后添加到EVA中,复合材料的氧指数分别提高了0.7%和1.5%,拉伸强度分别提高了2.3 MPa和1.9 MPa,断裂伸长率分别提高了37.8%和31.1%。由此可以说明改性MH可以有效提高EVA的阻燃性能和力学性能。Magnesium hydroxide powder prepared by ammonia evaporation and magnesium sedimentation was studied.Oleic acid and stearic acid were used as surface modifiers for magnesium hydroxide.By comparing the oil absorption value and activation index of magnesium hydroxide before and after modification,it was found that the optimal modification conditions of oleic acid and stearic acid were as follows:the dosage of oleic acid was 4%(relative mass of magnesium hydroxide powder),the modification time was 50 mim,and the modification temperature was 70℃.The dosage of stearic acid was 4%(relative to the mass of magnesium hydroxide powder),the modification time was 40 min,and the modification temperature was 50℃.By using the test of oil absorption value and activation index of magnesium hydroxide before and after modification,Fourier transform infrared spectrum(FTIR),X-ray diffraction(XRD),thermogravimetric analysis(TG-DTG),electron scanning electron microscope(SEM),water contact angle and other characterization methods,as well as the analysis and comparison of the effect of later addition in ethylene-vinyl acetate copolymer(EVA).The results show when magnesium hydroxide is modified with oleic acid and stearic acid and added to EVA,the oxygen index of the composite is increased by 0.7%and 1.5%,the tensile strength is increased by 2.3 MPa and 1.9 MPa,and the elongation at break is increased by 37.8%and 31.1%,respectively.Therefore,it could be shown that adding magnesium hydroxide modified to ethylene-vinyl acetate copolymer could improve the flame retardant and mechanical properties of composite materials.

关 键 词：轻烧粉 氢氧化镁 表面改性 油酸 硬脂酸 乙烯-醋酸乙烯酯共聚物 

分 类 号：TQ325.5[化学工程—合成树脂塑料工业]