A functionalized boride-filled silicone rubber-based thermally conductive material and preparation method thereof

Abstract

The invention discloses a functionalized boride-filled silicone rubber-based heat-conducting material and a preparation method thereof. In parts by weight, the formula comprises: 100 parts of silicone rubber base material, 15-23 parts of hydroxyl silicone oil compound, functionalized boride 128 to 174 parts, 0.5 to 1 part of superfine silicon carbide, and 0 to 1 part of nano-tungsten oxide. The present invention uses silicone rubber as the matrix, mixes cubic boron nitride and hexagonal boron nitride with different particle sizes, combines and grinds the boron simple substance, and then disperses the functionalized boride as a heat-conducting filler, and then passes through gamma radiation. Combined, a functionalized boride-filled silicone rubber-based thermally conductive material with excellent performance can be obtained; the composite material not only has excellent thermal conductivity, but also has good mechanical and thermal properties, and can be customized according to actual use scenarios. Tailoring of the shape to batch manufacture complex shapes of thermally conductive device underlayers.

Description

technical field [0001] The invention belongs to the technical field of special rubber materials and advanced composite materials, and in particular relates to a silicone rubber-based heat-conducting material filled with functionalized borides and a preparation method thereof. Background technique [0002] As a special rubber, silicone rubber has a series of excellent properties such as chemical stability, high elasticity, high and low temperature resistance, and weather resistance. It is often used as a filling cushion for shock absorption of precision components. With the technological development trend of integration, miniaturization, and high power, the heat dissipation problem of electronic devices and other micro-precision components during the service period needs to be solved urgently, otherwise it will cause a sharp shortening of the life of the device and even the paralysis of the control system. This requires that the shock-absorbing filling material has suitable m...

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Problems solved by technology

[0004] In recent years, silicone rubber materials with certain thermal conductivity have been reported (Chen Weiyan, Zhang Haiyan, Li Liping. A method for preparing a filled thermally conductive silicone rubber composite material. CN 101597430 A, 2009. Guo Xueqing. A thermally conductive silicone rubber composite material Its preparation method. CN 102757648 A, 2011. Li Qiuying, Wang Jibin, Wu Chifei. A method for preparing high thermal conductivity silicone rubber composite material. CN 102827480 A, 2012. Chai H, Tang X B, Ni M X, Preparation and properties of flexible flame -retardant neutron shielding material based on methyl vinyl silicone rubber,Journal of Nuclear Materials,2015,464:210-215. Zhang Weiming. A thermally conductive silicone rubber composite material and its preparation method. CN 106810869 A, 2017. Xu Weibing, Zhou Ran, Yang Zizheng. A self-reinforced thermally conductive insulating silicone rubber material filled with cross-linked functional thermally conductive powder and its preparation method. CN 108822553 A, 2018.), but the introduction of a large amount of high specific gravity thermally conductive powder will cause the interface of the bulk phase components of the material to fuse Difficulty, apparent density, and sharp increase in permanent deformation rate. Organotin catalysts are not only toxic but also released during long-term use, causing potential safety risks or corrosion hazards to surrounding components. Residues of peroxide vulcanizing agents not only The finished product has obvious odor and will cause the degradation and breakage of the silicone rubber chain structure, which is unfavorable for the filling cushion used as a shock-absorbing micro-precision component