Heat-conducting anti-flaming liquid silicon rubber and preparation method thereof

A technology of liquid silicone rubber and polysiloxane, which is applied in the direction of chemical instruments and methods, heat exchange materials, etc., can solve the problems of high vulcanization temperature, large smoke generation, power consumption, etc., and achieve good storage stability and vulcanization The effect of high speed and low energy consumption

Inactive Publication Date: 2008-04-30
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-conducting anti-flaming liquid silicon rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: A kind of heat-conducting flame-retardant liquid silicone rubber, 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 of Al with a particle size of 5 microns 2 o 3 Powder and 10Kg of Al(OH) with a particle size of 5 microns 3 Powder, add to the kneader in batches, with an interval of no less than 5 minutes each time, knead into a dough and continue kneading at room temperature for 1 hour;

[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 hours at a gauge pressure of 0.08Mpa, stop the vacuum, cool down to 120°C and knead evenly to pre...

Embodiment 2

[0048] Embodiment 2: a kind of heat-conducting flame-retardant liquid silicone rubber, 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), mixing 50Kg of Al with a particle size of 20 microns 2 o 3 Powder and 50Kg of Al(OH) with a particle size of 20 microns 3 Powder, add to the kneader in batches, with an interval of no less than 5 minutes each time, knead into a dough and continue kneading at room temperature for 1 hour;

[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 pressure of 0.08Mpa, stop the vacuum, cool down to 120°C and knead evenly to prepa...

Embodiment 3

[0054] Embodiment 3: a kind of heat-conducting flame-retardant liquid silicone rubber, 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), mixing 30Kg of Al with a particle size of 10 microns 2 o 3 Powder and 25Kg of Al(OH) with a particle size of 10 microns 3 Powder, add to the kneader in batches, with an interval of no less than 5 minutes each time, knead into a dough and continue kneading at room temperature for 1 hour;

[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 pressure of 0.08Mpa, stop the vacuum, cool down to 120°C and knead evenly to...

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Abstract

The invention discloses heat conduction flame retardant liquid silica gel, which comprises components with the following parts by weight: 10 to 40 parts of vinyl end organopolysiloxane with 500 to 5000 mPa.s polymeric viscosity in 25 DEG C, 10 to 40 parts of vinyl end organopolysiloxane with 10000 to 50000 mPa.s in 25 DEG C, and 1 to 5 parts of hydrogen-containing polymethylsiloxane, 2 to 8 parts of alkyl disilazane, 20 to 50 parts of surface hydrophobicity Al2O3 powder with average particle diameter of 5 to 20 microns, 10 to 50 parts of Al(OH)3 powder with average particle diameter of 5 to 20 microns, 0.3 to 2 parts of addition solidification catalyst, 0.01 to 0.06 part of alkynol depressant and 0.5 to 2 parts of distilled water, wherein, R is methyl, ethyl, propyl or butyl. The invention is prepared by the way of addition type heat vulcanization, toxic substance or irritant gas is not produced in the production process, the vulcanization rate is quick, and the energy saving, the consumption decreasing and the environmental protection requirements are conformed. The storage stability of the product is good, the viscosity is moderate, the operability is good, the product integrates the heat conduction, insulation and flame retardant performances into a whole, and the performance-price ratio is high.

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. 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 silicone rubber material is 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 the distribution of thermal conductive filler in the silicone rubber matrix. Metal fillers (such as Al, Ag, etc.) have h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08K5/544C09K5/10C09K21/14C08L83/05C08K3/22C08K5/05
Inventor 陈芳
Owner 兆舜科技(广东)有限公司
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