氮化硼基导热/阻燃水性涂料的制备  

Preparation of Boron Nitride Based Thermal Conductive Flame Retardant Waterborne Coatings

作　　者：李安妹 刘厚周 屈贞财 LI Anmei;LIU Houzhou;QU Zhencai(China Chemical Economic and Technological Development Center,Beijing 100029,China;Heshan Vocational and Technical School,Jiangmen,Guangdong 529700,China)

机构地区：[1]中国化工经济技术发展中心,北京100029 [2]鹤山市职业技术学校,广东江门529700

出　　处：《涂料工业》2024年第11期57-62,共6页Paint & Coatings Industry

摘　　要：为提升电子元器件用涂料的导热和阻燃性能,以氮化硼纳米片(BNNS)为导热基元,采用三聚氰胺-甲醛树脂(MF)包埋BNNS制备了兼具导热和阻燃性能的纳米填料(MF@BNNS),辅以水性聚氨酯树脂、多异氰酸酯和相关助剂制得了导热/阻燃水性涂料。通过扫描电子显微镜(SEM)观测了BNNS、MF@BNNS和炭化层的微观形貌,用傅立叶变换红外光谱仪(FT-IR)表征了BNNS和MF@BNNS的结构,利用热线法导热仪和锥形量热仪(MCC)分别测试涂料的导热系数和阻燃抑烟性能。结果表明:MF修饰后的BNNS可有效提高BNNS在涂料中的导热能力和阻燃能力。当MF@BNNS占涂料甲组分总质量的2.0%时,涂层导热系数提升至0.212 W/(m·K),比空白样和PCB电路板分别提升了35.90%和11.58%;同时,涂层的峰值热释放速率(PHRR)、总释放热(THR)、产烟率(SPR)和总产烟量(TSP)与空白样相比,分别下降了15.21%、25.91%、45.07%和88.94%。研制的产品既解决了传统填料性能单一的问题,又克服了氮化硼纳米片在高分子涂料中分散难、易团聚的问题,在电子电器领域具有良好的应用前景。In order to improve the thermal conductivity and flame retardancy of coatings for electronic components,a nano filler(MF@BNNS)with both thermal conductivity and flame retardancy was prepared by using boron nitride nanosheets(BNNS)as thermal conductive unit and melamine formaldehyde resin(MF)as embedding agent.Thermal conductivity and flame retardant waterborne coatings was prepared by using MF@BNNS,waterborne polyurethane resin,poly-isocyanates and related additives.The microscopic morphologies of BNNS,MF@BNNS and char layer were investigated using scanning electron microscopy(SEM).The structures of BNNS and MF@BNNS were characterized by Fourier transform infrared spectroscopy(FT-IR).The thermal conductivity and flame retard as well as smoke suppression properties of the coating were studied by a hot wire thermal conductivity meter and a cone calorimeter(MCC).The results showed that BNNS modified by MF could effectively enhance the thermal conductivity and flame retardancy.When MF@BNNS accounted for 2.0%of the total amount of component A,the thermal conductivity increased to 0.212 W/(m·K),which was 35.90%and 11.58%higher than that of the blank sample and PCB.Meanwhile,the peak heat release rate(PHRR),total heat release rate(THR),peak smoke release rate(SPR)and total smoke release rate(TSP)of the coating decreased by 15.21%,25.91%,45.07%and 88.94%,respectively.The developed product not only solved the problem of single performance of traditional fillers,but also overcome the problems of difficult dispersion and easy aggregation of BN nanoplates in polymer coatings,which had greatly promoted its application in the field of electrical and electronic heat management.

关 键 词：阻燃导热涂料 氮化硼纳米片 三聚氰胺 甲醛 包埋 聚氨酯 

分 类 号：TQ637[化学工程—精细化工]