Thermal-conductive silicone grease with high thermal conductivity and high temperature resistance and preparation method thereof

Abstract

Disclosed is a thermal-conductive silicone grease with high thermal conductivity and high temperature resistance. The silicone grease comprises, by weight, 60 to 80% of nano modified conductive filler, 15% to 30% of polysiloxane, 1% to 20% of silicone oil and 1% to 5% of additives. The nano modified conductive filler is an inorganic filler through silver powder surface modification treatment; the polysiloxane is an active silicone oil compound; the silicone oil is one or two of dimethyl modified silicone oil and benzyl modified silicone oil; and the additives are one or more of sodium hexametaphosphate, trisodium phosphate and sodium tripolyphosphate. According to the thermal-conductive silicone grease with high thermal conductivity and high temperature resistance, oanoscale conductive filler coated silver powder is the filler, and the prepared thermal-conductive silicone grease with high thermal conductivity and high temperature resistance is not dried, hardened or melted at a temperature of 300 DEG C or even more than 320 DEG C for a long time, had no flavor or odor, and has no corrosiveness to metals of iron, copper, aluminum and the like. The thermal-conductive silicone grease with high thermal conductivity and high temperature resistance has the advantages of being capable of prolonging the service life, being insulating, shockproof, radiation aging resistant and the like, and accelerating the heat conduction speed of electrical devices and improving radiation efficiency.

Description

【Technical field】 [0001] The invention relates to a high thermal conductivity, high temperature resistant thermal conductive silicone grease and a preparation method thereof. 【Background technique】 [0002] With the development of modern technology, electronic products are becoming more dense, miniaturized and efficient. Because it generates a lot of heat energy during use (that is, heat accumulation problem) will directly affect its reliability and service life. Using a heat sink with better thermal conductivity can reduce the thermal resistance to the environment and keep the internal temperature from being much higher than the ambient temperature, but this requires a higher cost. In addition, the unavoidable problem is that when the heat sink is used for a period of time, dust is deposited on the heat sink of the lamp body shell, and the dielectric layer connected to the copper layer substrate on the aluminum alloy-based copper-clad plate is aged and debonded, which will...

AI Technical Summary

Problems solved by technology

[0003] For two-component thermal conductive silicone grease, since the base oil used is a reactive base oil, because it is a two-component package, it must be prepared and used immediately, and it is often cross-linked and cured in a short time after coating. It brings a lot of inconvenience to the site construction and later maintenance

[0004] For the one-component thermal conductive silicone grease, since the base oil used is non-reactive base oil, the viscosity is generally low, the molecular chain is short and the diffusion rate is large, and the crawling phenomenon is serious. During long-term use, the base oil and Thermally conductive fillers often separate, and the direct result is pulverization, cracking and poor thermal conductivity of the thermally conductive silicone grease coating; while using high-viscosity base oils, it is difficult to add thermally conductive fillers with high solid content, and the thermal conductivity of the product is relatively poor, and , domestic and foreign thermal grease products have great differences in performance and price, that is, domestic products have relatively low thermal conductivity and cannot effectively solve the problem of heat accumulation, while foreign products have better thermal conductivity, but the price is high