Insulating heat-conducting rubber composite material and preparation method thereof

Abstract

The invention discloses an insulating heat-conducting rubber composite material which is prepared from the following components in parts by weight: 20-30 parts of amino-terminated hyperbranched polysiloxane HPSi-NH2, 50-70 parts of epoxy nitrile rubber, 15-25 parts of epichlorohydrin rubber, 5-8 parts of N, N', N''-tri-(tetra-(hexadecyl) melamine ethyl)-melamine, 4-7 parts of aluminum oxide nanotubes, 2-4 parts of silicon boride nano powder, 3-7 parts of silicon carbide fibers, 100-150 parts of inorganic filler and 3-5 parts of a negatively charged coupling agent. The invention also provides a preparation method of the insulating heat-conducting rubber composite material. The insulating heat-conducting rubber composite material is good in comprehensive performance and performance stability, remarkable in insulating and heat-conducting effect and good in mechanical property and aging resistance.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to an insulating and heat-conducting rubber composite material and a preparation method thereof. Background technique [0002] With the rapid development of microelectronics integration and assembly technology, the circuit design of electronic products is becoming more and more complex, showing a trend of densification and miniaturization. The volume of electronic components and logic circuits shrinks tens of millions of times, while the operating frequency increases sharply. At this time, the heat generated by electronic equipment accumulates and increases rapidly, and the temperature of the working environment also changes rapidly to high temperatures. If the heat cannot be discharged in time If accumulated to a certain extent, it will inevitably cause damage to the components of electronic appliances and the equipment itself. Therefore, it is imperative to develop hi...

AI Technical Summary

Problems solved by technology

Rubber itself is insulating, but thermally conductive filler materials often affect its insulating properties

Such as metal powder, graphite, carbon fiber, carbon nanotube, carbon fiber and other non-insulating fillers can improve the thermal conductivity of rubber materials, but it will also lead to a significant decrease in the insulation of rubber materials, and even transform them into conductive materials.

Existing insulating and heat-conducting rubber composite materials have more or less thermal conductivity, physical properties and insulation properties that cannot be taken into account at the same time, poor mechanical properties, poor weather resistance and ultraviolet resistance, short lifespan, easy to be damaged, and high preparation cost. High, comprehensive performance and performance stability needs to be further improved

[0004] The application number is 201310372003.3, and the Chinese patent application titled "A High Thermal Conductivity Insulation Thermal Conductive Silicone Gasket and Its Preparation Method" contains the following raw materials in parts by weight: spherical alumina 600-1000 parts, methyl vinyl silicone rubber 5-15 parts, 30-70 parts of dimethyl silicone oil, 2-15 parts of hydrogen-containing silicone oil, and 0.5-1.5 parts of catalyst. Although it has good insulation and thermal conductivity, due to the large proportion of The simethicone oil will cause the silicone gasket to be easily precipitated during use, resulting in cracking and hardening of the silicone products.