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Heat-conducting silicone rubber with high electric dielectric strength and preparation method of heat-conducting silicone rubber

A heat-conducting silicone rubber and insulation strength technology, applied in the field of silicone rubber, can solve the problems of poor insulation performance, not enough to meet the requirements of electronic appliances, and the decline of electrical insulation performance of silicone rubber, so as to achieve good product quality and avoid electrical insulation performance Decrease and improve the effect of electrical insulation performance

Inactive Publication Date: 2016-05-04
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ordinary dealcoholized one-component room temperature curing silicone rubber itself has good electrical insulation properties. When adding thermally conductive fillers to improve its thermal conductivity, on the one hand, the insulation performance of the filler itself is not good. On the other hand, the filler’s Adding it will also induce the formation of electrical branches inside the silicone rubber, which will significantly reduce the electrical insulation performance of the prepared silicone rubber, which is not enough to meet the requirements of some electronic appliances.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 100 parts (mass, the same below) of α, ω-terminated hydroxyl polydimethylsiloxane with a hydrogen content of 0.12%, 20 parts of magnesium oxide with an average particle size of 10 μm, and 40 parts of aluminum nitride and 40 parts of alumina with an average particle size of 15 μm were added to the disperser and mixed in the disperser for 0.6 hours. After dehydration and drying, under the condition of ensuring anhydrous, add methyl trimethyl 6 parts of oxysilane, 0.3 parts of bis(ethyl acetoacetate) diisopropoxy titanate, 5 parts of zinc oxide with an average particle size of 1 μm, and mix them uniformly to obtain component A for later use;

[0030] Weigh 100 parts of α,ω-vinyl polydimethylsiloxane with a number average molecular weight of 186 and 3 parts of chloroplatinic acid-tetramethyldivinyldisiloxane complex, and mix them uniformly to obtain Group B spare;

[0031] Weigh component A and component B with a mass ratio of 1:0.13, mix them uniformly under anhydro...

Embodiment 2

[0034] Weigh 100 parts (mass, the same below) of α, ω-terminated hydroxyl polydimethylsiloxane with a hydrogen content of 0.37%, 20 parts of magnesium oxide with an average particle size of 10 μm, and 75 parts of aluminum nitride and 45 parts of alumina with an average particle size of 15 μm were added to the disperser and mixed in the disperser for 0.8 hours. After dehydration and drying, under the condition of ensuring anhydrous, orthosilicic acid was added to the disperser 10 parts of ethyl ester, 0.25 parts of 2-ethylhexyloxy titanate, 5 parts of zinc oxide with an average particle size of 1 μm, and 3 parts of nano-titanium dioxide are mixed uniformly to obtain component A for later use;

[0035] Weigh 100 parts of α,ω-vinyl polydimethylsiloxane with a number average molecular weight of 186 and 3.5 parts of chloroplatinic acid-tetramethyldivinyldisiloxane complex, and mix them uniformly to obtain Group B spare;

[0036] Weigh component A and component B with a mass ratio ...

Embodiment 3

[0039] Weigh 100 parts (mass, the same below) of α, ω-terminated hydroxyl hydrogen-containing polydimethylsiloxane with a hydrogen content of 0.59%, and weigh 20 parts of magnesium oxide with an average particle size of 10 μm and an average particle size of 120 parts of aluminum nitride of 3 μm and 60 parts of alumina with an average particle size of 15 μm were added to the disperser and mixed in the disperser for 1 hour. After dehydration and drying, under anhydrous conditions, add tetramethyl 6 parts of oxysilane, 0.4 parts of bis(acetylacetonate) isopropoxy titanate, 6 parts of zinc oxide with an average particle size of 1 μm, 2 parts of nano-alumina, and 2 parts of nano-titanium dioxide, and mix them uniformly to obtain Group A spare;

[0040] Weigh 100 parts of α,ω-vinylpolydimethylsiloxane with a number average molecular weight of 1888 and 3.7 parts of chloroplatinic acid-tetramethyldivinyldisiloxane complex, and mix them uniformly to obtain Group B spare;

[0041] Wei...

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Abstract

The invention discloses heat-conducting silicone rubber with high electric dielectric strength, belonging to the technical field of silicone rubber. The heat-conducting silicone rubber comprises a component A and a component B in a mass ratio of (1 to 0.1)-(1 to 15), wherein the component A comprises the following components in parts by weight: 100 parts of alpha-omega-terminal hydroxyl hydrogen-containing polydimethylsiloxane, 5-15 parts of a silane coupling agent, 0.05-5 parts of a catalyst I, 100-200 parts of a heat-conducting insulating filling and 5-15 parts of an anti-sedimentation agent; and the component B comprises the following components in parts by weight: 100 parts of low-molecular-weight alpha-omega-vinyl polydimethylsiloxane and 0.5-5 parts of a catalyst II. The invention further provides a preparation method of the heat-conducting silicone rubber with high electric dielectric strength. The preparation method comprises the following steps: (1) preparing the component A; (2) preparing the component B; and (C) preparing the silicone rubber. The silicone rubber has good heat-conducting property and high electric dielectric strength, and the degrading of the electric dielectric performance caused by the introduction of the heat-conducting filling is avoided.

Description

technical field [0001] The invention relates to a silicone rubber, in particular to a heat-conducting silicone rubber with high electrical insulation strength and a preparation method thereof, belonging to the technical field of silicone rubber. Background technique [0002] As a special rubber, silicone rubber belongs to synthetic rubber. Silicone rubber has a structure in which silicon atoms and oxygen atoms are alternately arranged as the main chain, which makes it much more stable to heat and oxygen than ordinary organic polymers. Compared with ordinary rubber, silicone rubber has the following advantages: it has excellent properties such as high and low temperature resistance, electrical insulation, ozone resistance, radiation resistance, flame retardant, water repellency, corrosion resistance, non-toxic and tasteless, and physiological inertia. Due to these excellent properties, silicone rubber plays an irreplaceable role in high-tech fields such as aerospace, electron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08K13/02C08K3/28C08K3/22C08K3/36
CPCC08L83/06C08K2201/011C08K2201/014C08L83/04C08K13/02C08K2003/222C08K2003/282C08K2003/2227C08K2003/2296C08K2003/2241C08K3/36
Inventor 周正发刘晓航曹聪徐卫兵马海红任凤梅
Owner HEFEI UNIV OF TECH
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