摘要
以硝酸镁和硝酸铝为原料,采用共沉淀法制备了Mg/Al-CO_3-LDHs前体,然后通过阴离子交换法制备了衣康酸插层、钛酸酯偶联剂NDZ-201附着的复合改性水滑石(ITA-LDHs)。通过熔融共混法制备了阻燃性能和力学性能较好的ITA-LDHs改性的聚丙烯(PP)复合材料。通过FTIR、XRD、TGA和SEM对ITA-LDHs进行了表征。结果表明:衣康酸已经插入到水滑石层间,钛酸酯偶联剂已经附着在水滑石表面。对复合材料的极限氧指数(LOI)、垂直燃烧实验(UL-94)、热重曲线、热释放速率(HRR)、总热释放速率(THR)和质量损失率进行了测定,结果表明:随着水滑石添加量的增多,无论是未改性还是改性的水滑石都能对PP起到阻燃效果,且改性后的水滑石(LDHs)的LOI值、抗熔滴时间、热稳定性、成炭率均显著提高。当水滑石的添加量为30%(以聚丙烯的质量为基准,下同)时,ITA-LDHs改性PP的LOI达到27.5%,明显优于添加未改性LDHs PP的25.5%;UL-94等级达到V0级,优于未改性LDHs的V1级;通过测试材料的弯曲强度和拉伸强度可知,与未改性的水滑石相比,改性后的水滑石力学性能明显改善。
Mg/Al-CO3-LDHs precursor was prepared by coprecipitation from magnesium nitrate and aluminium nitrate.And then composite modified hydrotalcite(ITA-LDHs)with itaconic acid intercalation and titanate coupling agent NDZ-201 was prepared by anion exchange method.Subsequently,polypropylene(PP)composites with good flame retardancy and good mechanical properties were prepared by melt blending.ITA-LDHs was characterized by FTIR,XRD,TGA and SEM.The results showed that itaconic acid was inserted into the interlayer of hydrotalcite,and titanate coupling agent was attached to the surface of hydrotalcite.The prepared composites were evaluated by limit oxygen index(LOI),vertical burning test(UL-94),TGA and cone calorimeter.The results indicated that with the increase of the addition of hydrotalcite,both unmodified and modified LDHs played flame-resistant effect on PP.The LOI value,anti-dripping time,thermal stability and carbonization rate of the composites containing modified LDHs were better than those of the composites containing unmodified LDHs.When the addition of ITA-LDHs in PP was 30%(based on the mass of PP,the same below),the LOI value reached 27.5%and the UL-94 grade reached V0 level,both were better than those of the composites adding unmodified hydrotalcite.By testing the bending strength and tensile strength of the composites,it was found that the addition of ITA-LDHs improved obviously the mechanical properties of the composites.
作者
王松林
董合贺
邢仁卫
崔鲁青
王飞
杨旭旭
WANG Song-lin;DONG He-he;XING Ren-wei;CUI Lu-qing;WANG Fei;YANG Xu-xu(School of Marine Science and Bioengineering,Qingdao University of Science&Technology,Qingdao 266000,Shandong,China;Key Laboratory of Pulp and Paper Science&Technology of Ministry of Education/Shandong Province,Qilu University of Technology,Jinan 250353,Shandong,China;Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization,Weifang University of Science and Technology,Shouguang 262700,Shandong,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2019年第5期813-819,827,共8页
Fine Chemicals
基金
教育部制浆造纸科技重点实验室基金会资助(山东省)(KF201706)~~
关键词
复合改性
水滑石
聚丙烯
阻燃剂
力学性能
功能材料
composite modification
hydrotalcite
polypropylene
flame-retardant agent
mechanical property
functional materials
