Heat conduction flame-proof liquid silicon rubber for electron and method of producing the same

A liquid silicone rubber and electronic technology, used in rubber insulators, organic insulators, etc., can solve the problems of high vulcanization temperature, power consumption, affecting production environment, etc., and achieve the effects of good storage stability, low energy consumption and high thermal conductivity.

Active Publication Date: 2009-04-08
兆舜科技(广东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using the above method to prepare thermally conductive silicone rubber, due to the high price of raw rubber, is not conducive to reducing costs, and the fillers, oil, antioxidants, and resins in the rubber component may consume free radicals under certain conditions, and strict matching is required; The rubber products made by peroxide vulcanization method have low tensile and tear strength, and the vulcanization time is not easy to adjust. During vulcanization, peroxide will release irritating gas, which will affect the production environment. The vulcanization temperature is high and consumes a lot of electric energy. The high viscosity is not easy to operate, and because it is a polymer material, it is flammable and has a large amount of smoke, sometimes it is the direct fuse of a fire
The above products can no longer meet the comprehensive performance requirements of electrical components for high thermal conductivity, insulation and flame retardancy of heat dissipation materials

Method used

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  • Heat conduction flame-proof liquid silicon rubber for electron and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: A heat-conducting flame-retardant liquid silicone rubber for electronics, its preparation steps are as follows:

[0043]a) Add 10Kg of vinyl-terminated polydimethylsiloxane with a polymerization viscosity of 500-5000mPa.s and 10Kg of vinyl-terminated polydimethylsiloxane with a polymerization viscosity of 10000-50000mPa.s into the kneader at 25°C base siloxane, 2Kg hexamethyldisilazane, 0.5Kg distilled water and 0.01Kg white powder, knead evenly;

[0044] b), mixing 20Kg surface hydrophobic Al 2 o 3 Mix powder with MgO and 10Kg Al(OH) with a particle size of 2μm 3 Powder, Al in mixed powder 2 o 3 MgO and MgO particle sizes are 5 μm and 2 μm respectively, add to the kneader in batches, with an interval of no less than 5 minutes each time, and continue to knead at room temperature for 1 hour after kneading into agglomerates;

[0045] c), heating up to 150°C and kneading at a constant temperature for 1 hour;

[0046] d) Vacuum at 150°C and knead for 2 h...

Embodiment 2

[0048] Embodiment 2: A kind of heat-conducting flame-retardant liquid silicone rubber for electronics, its preparation steps are as follows:

[0049] a) Add 40Kg of vinyl-terminated polydiethylsiloxane with a polymerization viscosity of 500 to 5000mPa.s and 40Kg of vinyl-terminated polypropylene with a polymerization viscosity of 10000 to 50000mPa.s into a kneader at 25°C base siloxane, 5Kg hexamethyldisilazane, 2Kg distilled water and 0.02Kg yellow paste, knead evenly;

[0050] b) Mix 50KgAl 2 o 3 Mixed powder with MgO and 50Kg of Al(OH) with a particle size of 10μm 3 Powder, Al in mixed powder 2 o 3 MgO and MgO particle sizes are 5 μm and 2 μm respectively, add to the kneader in batches, with an interval of no less than 5 minutes each time, and continue to knead at room temperature for 1 hour after kneading into agglomerates;

[0051] c), heating up to 150°C and kneading at a constant temperature for 1 hour;

[0052] d) Vacuum at 150°C and knead for 2 hours at a gauge ...

Embodiment 3

[0054] Embodiment 3: A kind of heat-conducting flame-retardant liquid silicone rubber for electronics, its preparation steps are as follows:

[0055] a) Add 25Kg of vinyl-terminated polydimethylsiloxane with a polymerization viscosity of 500-5000mPa.s and 25Kg of vinyl-terminated polydimethylsiloxane with a polymerization viscosity of 10000-50000mPa.s into the kneader at 25°C base siloxane, 3.5Kg hexamethyldisilazane, 1Kg distilled water and 0.01Kg yellow paste, knead evenly;

[0056] b) Mix 30KgAl 2 o 3 Mix powder with MgO and 25Kg Al(OH) with a particle size of 5μm 3 Powder, Al in mixed powder 2 o 3 MgO and MgO particle sizes are 5 μm and 2 μm respectively, add to the kneader in batches, with an interval of no less than 5 minutes each time, and continue to knead at room temperature for 1 hour after kneading into agglomerates;

[0057] c), heating up to 150°C and kneading at a constant temperature for 1 hour;

[0058] d) Vacuum at 150°C and knead for 2 hours at a gauge ...

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Abstract

The invention discloses a heat-conductive anti-flaming liquid silicone rubber used for electrons, which comprises the components with the following parts by weight: ethylene group dead-end organic polysiloxane which has polymer viscosity of 500 to 5000mPa.s and 10000 to 50000mPa.s when reaching 25 DEG C and has a general formula R2SiO(SiRR'O)nSiR2; hydric polysiloxane which has a general formula R'R2SiO(SiR HO)nSiR2R'; alkyldisilazane which has a general formula R3SiNHSiR3; a mixed-powder of Al2O3 and MgO with the surface hydrophobic particle size being respectively 5 Mum and 2 Mum and with the ratio of 4:1between Al2O3 and MgO; an Al(OH)3 powder which has an average particle size of 2 to 10 Mum; an additive solidified catalyst; an alkynol solidified inhibitor; and distilled water. The silicone rubber generates no toxic substance or irritative gas and has no side product and high efficiency; the product obtained is characterized by high thermal conductivity, good storage stability, moderate viscosity and good operability, and can integrate heat conduction, insulation and anti-flaming properties together, thereby meeting higher requirements of electrical appliances industry and having high cost performance.

Description

technical field [0001] The invention relates to a new type of rubber material, in particular to a heat-conducting silicone rubber material used for heat dissipation of heating components such as CPUs, motherboards, printers, etc. in electronic and electrical products. Background technique [0002] In order to solve the problem of timely heat dissipation of high-heating electrical components during work to ensure their stable operation, the heat is transferred to the metal heat sink through the material attached to the surface of the heating element to achieve the purpose of heat dissipation. This requires heat-conducting materials to have good heat conduction and insulation performance. [0003] Thermally conductive and flame-retardant silicone rubber materials for electronics are a typical polymer composite material, which plays an important role in thermally conductive materials. Its thermal conductivity is mainly determined by the type of thermal conductive filler and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08K13/02C08K3/22C08K5/05B29B7/28C08J3/24H01B3/28C08L83/05
Inventor 陈芳
Owner 兆舜科技(广东)有限公司
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