化工新型材料

化工新型材料 ›› 2024, Vol. 52 ›› Issue (5) : 120-124. DOI: 10.19817/j.cnki.issn1006-3536.2024.05.028

新材料与新技术

改性氮化硼/水性聚氨酯导热复合材料的制备与表征

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Preparation and characterization of modified boron nitride/waterborne polyurethane thermal conductive composites

Xue Yaozong¹, Zhao Yujin¹, Wu Shuying¹, Wu Zhimin²

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文章历史 +

Received		Published
2023-02-14		2024-05-20
Issue Date	Revised Date
2024-05-28	2023-02-14

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摘要

以氮化硼为原料,用γ-氨丙基三乙氧基硅烷对其进行氨基化改性,利用水解产生的硅羟基和氮化硼烯表面的含氧官能团进行缩合反应后,得到改性导热填料。将其与水性聚氨酯乳液原位聚合,制备改性氮化硼/水性聚氨酯复合乳液,室温干燥成膜后得到胶膜样品。分析了填料含量对复合胶膜结构、机械性能、导热性能和热稳定性等性能的影响,并分析其作为热界面材料的散热效果。结果表明:改性后的胶膜拉伸强度、断裂伸长率、导热性能和热稳定性都能得到明显的提升。当填料质量分数为15%时,复合胶膜较纯胶膜热源温度降低了2.2℃,界面间传热效率得到提高。

Abstract

Boron nitride was modified with γ-Aminopropyl triethoxysilane for amination,and after condensation reaction between the silicon hydroxyl group produced by hydrolysis and the oxygen-containing functional group on the surface of boron nitride,the modified thermal conductive fillers were obtained.The modified boron nitride/waterborne polyurethane composite emulsion was prepared by in-situ polymerization of the thermal conductive fillers and the waterborne polyurethane emulsion.The emulsion was dried to form film samples at room temperature.The effects of the filler content on the microstructure,mechanical properties,thermal conductivity and thermal stability of the composite films were analyzed.Meanwhile,its heat dissipation effect as a thermal interface material was discussed.The results showed that the tensile strength,breaking elongation,thermal conductivity and thermal stability of the modified films were significantly improved.When the mass fraction of filler was 15%,the heat source temperature of the composite film was 2.2℃ lower than that of pure film,and the thermal transfer efficiency between interfaces was improved.

关键词

氮化硼 / 水性聚氨酯 / 导热性能 / 机械性能 / 散热

Key words

boron nitride / waterborne polyurethane / thermal conductivity / mechanical property / heat dissipation

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改性氮化硼/水性聚氨酯导热复合材料的制备与表征[J]. 化工新型材料, 2024, 52(5): 120-124 DOI:10.19817/j.cnki.issn1006-3536.2024.05.028

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