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Silicone rubber composition and preparation method of silicone rubber

A technology of silicone rubber composition and silicone rubber, which is applied in the field of preparation of silicone rubber composition and silicone rubber, and can solve problems such as poor heat resistance and thermal conductivity, difficulty in preparing materials with stable performance, and easy aging and yellowing of materials

Active Publication Date: 2011-11-09
宁海县集美特电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems that the silicone rubber composition in the prior art has poor heat resistance and thermal conductivity, it is difficult to prepare a material with stable performance, and the material is easy to age and turn yellow, it provides a high temperature resistance, high thermal conductivity and stable performance. Vulcanized silicone rubber composition with strong binding properties, strong anti-yellowing performance, and easy preparation and storage

Method used

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  • Silicone rubber composition and preparation method of silicone rubber

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preparation example Construction

[0023] The present invention improves the preparation method of silicone rubber at the same time, and the steps include: S1: adding zinc salt into the solution containing titanium oxide to obtain a mixed solution, and then adding an alkaline solution to react until the pH value of the mixed solution is 9-10, and the bag is obtained. Titanium oxide composite material coated with zinc hydroxide;

[0024] Then add silane coupling agent 70-135 to react to prepare thermally conductive composite material;

[0025] S2: Mix the polyorganosiloxane and the thermally conductive composite material obtained in step S1 at a vacuum degree of -0.095 to -0.1Mpa and a temperature of 110-155°C;

[0026] Add silane cross-linking agent and polyether and mix under vacuum degree -0.095~-0.1Mpa, temperature 80-120°C to prepare silicone rubber. The preparation method is simple and easy to implement, easy to process and practical.

[0027]Various control methods known to those skilled in the art can b...

Embodiment 1

[0035] Add 150Kg of zinc sulfate to 300Kg of nano-titanium dioxide (average particle size about 50nm) ethanol slurry, stir evenly, and add sodium hydroxide to adjust the pH value = 9.5, so that the zinc will be in the form of Zn(OH) 2 The form is precipitated on the surface of titanium dioxide particles, and the average particle size is about 250nm, which is coated with Zn(OH) 2 Titanium dioxide, then add 20Kg coupling agent KH-550 (r-aminopropyltriethoxysilane), stir and react at 70°C for 3h, then filter and dry to obtain a modified thermally conductive composite material.

[0036] Put 100Kg of 107 glue (hydroxyl-terminated polydimethylsiloxane, 50000), 29.8Kg of fumed silica (50nm), and 12.5Kg of the modified thermally conductive composite material prepared above into the planetary mixer, and vacuumize to -0.098MPa, Stir at 150°C for 2 hours; add 5.2Kg polyphenylene ether (5000), 5.2Kg vinyl tributylketoxime silane, vacuum to -0.098MPa, stir at 120°C for 1 hour; add 0.1Kg di...

Embodiment 2

[0038] Silicone rubber was prepared by the same method as in Example 1, except that the amount of thermally conductive composite material added when preparing the silicone rubber was 5.2Kg.

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Abstract

The invention provides a silicone rubber composition comprising, a heat conductive composite material, a silane cross-linking agent, and polyether. The heat conductive composite material comprises a silane coupling agent, and titanium oxide coated with zinc hydroxide. The invention also relates to a preparation method of silicone rubber. The silicone rubber composition provided by the invention is easy to prepare and to store. Prepared silicone rubber has advantages of high-temperature resistance, high heat conductivity, stable performance, and good anti-yellowing performance. With the technical schemes provided by the invention, application environment of the silicone rubber composition is extended. Materials manufactured with the silicone rubber composition have good mechanical properties and improved mechanical strengths. With good adhesion of the silicone rubber, sealing performances of manufactured materials are improved. Comprehensive property of the silicone rubber is excellent. With the silicone rubber composition and the preparation method provided by the invention, a basis is established for further development of silicone rubber.

Description

technical field [0001] The invention relates to a silicone rubber composition and a preparation method of the silicone rubber. Background technique [0002] Due to its good heat resistance, cold resistance and excellent electrical insulation properties, room temperature vulcanized silicone rubber can be cured in situ without heating or pressure at room temperature, so it is extremely convenient to use. One-component deketoxime silicone rubber in silicone rubber has excellent electrical insulation properties such as large volume resistance, high breakdown strength and good corona resistance due to its wide temperature range (60-250 ° C), and excellent At the same time, it has excellent properties such as water resistance, corrosion resistance, radiation resistance, and atmospheric aging resistance. It is widely used in the positioning, bonding, sealing and filling of components in electronic products and electrical equipment. Dustproof, moistureproof, corrosionproof and shoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08L71/00C08L81/06C08L71/08C08K9/06C08K9/10C08K3/22C08K3/36
Inventor 姚云江张日清周勇
Owner 宁海县集美特电器有限公司
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