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。

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

Abstract: 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 effectivelyenhance 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 ofsingle performance of traditional fillers，but also overcome the problems of difficult dispersionand easy aggregation of BN nanoplates in polymer coatings，which had greatly promoted itsapplication in the field of electrical and electronic heat management.

Key words: flame retardant thermal conductive coatings, boron nitride nanoplates, melamine, formaldehyde, embedding, polyurethane

中图分类号: 

• TQ637