异氰酸酯改性蒙脱土的制备及其对铸型尼龙6性能的影响  

Preparation of montmorillonite modified by isocyanate and it's effects on properties of monomer casting nylon 6

作　　者：赖登旺[1,2] 李笃信[1] 杨金[2] 杨军[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]株洲时代新材料科技股份有限公司,株洲412007

出　　处：《复合材料学报》2016年第1期27-33,共7页Acta Materiae Compositae Sinica

摘　　要：通过二苯基甲烷-4,4′-二异氰酸酯(MDI)改性钠基蒙脱土(Na-MMT),使Na-MMT呈纳米级剥离态分散,制得MDI改性Na-MMT(M-MMT)。将M-MMT加入至铸型尼龙6体系中原位聚合成型,以解决有机蒙脱土在铸型尼龙6体系中热降解的问题,提高复合材料的耐热性。利用FITR、GC-MS、XRD和TEM研究了改性机理和Na-MMT的分散情况。通过TG、维卡软化、热变形温度测试、力学性能测试和SEM观察,研究了M-MMT/铸型尼龙6复合材料的耐热性、力学性能和微观形貌。结果表明:MDI能与Na-MMT层间的羟基以及水反应使M-MMT呈剥离态分散。虽然在铸型尼龙6体系引发剂定量的情况下,MDI消耗体系引发剂,引起M-MMT/铸型尼龙6复合材料分子量的下降,导致各项力学性能有所下降,但M-MMT的纳米级效应使复合材料的耐热性得到提高,维卡软化点提高至224℃,在1.82 MPa负荷条件下,热变形温度提高至96℃。Na-montmorillonite （Na-MMT） which was modified by diphenyl methane-4,4＇-diisocyanate （MDI） was exfoliated in nanoseale, MDI modified Na-MMT （M MMT） was prepared. And then add M-MMT into monomer casting nylon 6 system to solve the thermal degradation problem that organic montmorillonite has presented in mono- mer casting nylon 6 system and improve the heat resisting property of the composites. The modification mechanism and dispersion of Na-MMT were investigated using FITR, GC-MS, XRD and TEM. Heat resisting, mechanical properties and the microstructure of M MMT/monomer casting nylon 6 composites were investigated by TG, vicar softening, thermal deformation temperature test, mechanical property test and SEM observation. The results show that M-MMT is exfoliated by MDI, which is attributed to the reactions between MDI and the hydroxyl or the water in Na-MMT layers. In the monomer casting nylon 6 system, due to the mensurable initiator and those consumptions by MDI, the molecular mass of the M-MMT/monomer casting nylon 6 cmposites decreases, which leads to the de- clining mechanical properties, while the heat resisting of the cmposites improve because of the nanoscale effect of M- MMT. The vicat softening temperature increases up to 224 ℃, and the thermal deformation temperature increases up to 96 ℃, under loading condition of 1.82 MPa.

关 键 词：异氰酸酯 蒙脱土 剥离 铸型尼龙6 复合材料 

分 类 号：TQ327[化学工程—合成树脂塑料工业]