High-electrical-insulating-property heat-conductive silicon rubber thermal interface material for LED and preparation method

Abstract

The invention discloses a high-electrical-insulating-property heat-conductive silicon rubber thermal interface material for an LED. The material is prepared from, by weight, 45-65 parts of silicon rubber matrix, 20-30 parts of butadiene-acrylonitrile rubber, 18-26 parts of aluminum nitride, 14-24 parts of dopamine, 20-35 parts of 20 mmol / L silver nitrate solution, 1-3 parts of hydroxyl silicone oil, 2-5 parts of DBPH, a proper amount of deionized water, a proper amount of Tris-HCl buffer solution, 1-3 parts of anti-ageing agent RD and 1.5-2 parts of magnesium carbonate. Dopamine is used for forming a compact attached polydopamine layer on the surface of aluminum nitride through oxidative polymerization, silver nanoparticles are loaded on the surface of the polydopamine layer wrapping the aluminum nitrode, silcion rubber is compounded and filled, high heat conductivity and cooling performance of the silicon rubber thermal interface material are improved, and the material has good smoothness, tear strength and electric insulation property.

Description

technical field [0001] The invention belongs to the field of thermal interface materials, and in particular relates to a thermal interface material of high electrical insulation and heat conduction silicon rubber for LEDs and a preparation method. Background technique [0002] With the continuous improvement of LED manufacturing and packaging technology, the power of LED is getting bigger and bigger. At present, the input power of commercialized high-power LEDs is generally above 1W, the chip area is 1mm×1mm, and the heat flux is 100W / cm 2 Above, heat dissipation requirements are very high. The heat transfer from the chip to the external environment has to pass through several interfaces. The gap between the interfaces and the warpage of the substrate will affect the bonding and local heat dissipation, forming interface thermal resistance. With the development of high-power and high-brightness LEDs, interface thermal resistance has become one of the problems in the LED ind...

AI Technical Summary

Problems solved by technology

Among them, the theoretical thermal conductivity of aluminum nitride high-purity single crystal can reach 320W / (m K), which has reliable electrical insulation performance, low dielectric loss and dielectric constant, and is an ideal thermal conductive filler. After absorbing moisture, it will undergo hydrolysis reaction with water to produce Al(OH) 3 It will interrupt the thermal conduction path, which will affect the transmission of phonons. Therefore, the thermal conductivity of the finished product is low. Even if the surface is treated with a silane coupling agent, it cannot guarantee that the filler surface is 100% covered.