十二烷基硫酸钠/硼酸复合改性水滑石阻燃剂的制备及其在聚丙烯中的应用  

Preparation of LDH flame retardant modified by sodium dodecyl sulfate/boric acid and its application in polypropylene

作　　者：张坤 张官铭 张睿 何涛 蔡玉荣[1] 姚菊明[1] ZHANG Kun;ZHANG Guanming;ZHANG Rui;HE Tao;CAI Yurong;YAO Juming(School of Materials Science&,Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang Lianyang New Material Co.,Ltd.,Jiaxing 314511,China)

机构地区：[1]浙江理工大学材料科学与工程学院,杭州310018 [2]浙江联洋新材料股份有限公司,浙江嘉兴314511

出　　处：《浙江理工大学学报（自然科学版）》2022年第6期814-820,共7页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：浙江省国际科技合作项目-双边产业联合研发计划项目(2022C04027)。

摘　　要：为改善水滑石(LDH)与聚合物基体相容性差、阻燃效率低的问题,利用离子交换法制备了十二烷基硫酸钠(SDS)和硼酸复合改性的水滑石,并将其作为阻燃剂,经熔融共混法制得PP/LDH复合材料。采用红外、XRD、SEM和TGA对改性水滑石的结构、形貌和性能进行分析,利用极限氧指数仪和锥形量热仪对PP/LDH复合材料的阻燃性能进行分析。结果表明:复合改性方法有效扩大了水滑石的层间距,改善了其与PP基体间相容性,有利于LDH阻燃剂在PP中的均匀分散。复合改性LDH的添加大大提升了PP/LDH复合材料的阻燃性能;当向PP中添加质量分数为20.0%的阻燃剂时,该材料的极限氧指数值由纯PP的18.0%提升至30.9%,热释放速率峰值由纯PP的1215.84 kW/m^(2)下降至50.70 kW/m^(2),烟释放总量由纯PP的12.66 m^(2)下降至6.15 m^(2)。该研究为高阻燃性能聚丙烯的制备及应用提供了策略支撑。In order to solve the problems of poor compatibility between layered double hydroxide(LDH) and polymer matrix and low flame retardant efficiency, LDH modified by sodium dodecyl sulfate and boric acid was prepared by means of ion exchange, and it was used as a flame retardant to prepare the PP/LDH composite through melt blending. The structure, morphology and properties of the modified LDH were characterized by FT-IR, XRD, SEM and TGA. The flame retardancy of the PP/LDH composite was analyzed by limiting oxygen index meter and cone calorimeter. The results showed that the method of compound modification effectively enlarged the interlayer spacing of LDH, improved its compatibility with PP matrix and was conducive to the uniform dispersion of LDH flame retardant in PP matrix. The addition of the modified LDH greatly improved the flame retardancy of PP/LDH composite. When flame retardant with a mass fraction of 20.0% was added to PP, the limiting oxygen index of this composite increased from 18.0% for pure PP to 30.9%. The peak heat release rate decreased from 1215.84 kW/m^(2) for pure PP to 50.70 kW/m^(2) and the total smoke emission decreased from 12.66 m^(2) for pure PP to 6.15 m^(2). Our study provides strategic support for the preparation and application of polypropylene with high flame retardancy.

关 键 词：水滑石 聚丙烯 十二烷基硫酸钠 硼酸 阻燃性能 

分 类 号：TB332[一般工业技术—材料科学与工程]