High-temperature resistant silicone rubber and preparation method thereof

A high temperature resistant silicone rubber and rubber technology, applied in the field of materials, can solve the problems of loss of mechanical properties and insulating properties, and achieve the effect of excellent heat resistance

Inactive Publication Date: 2014-09-17
WUXI XINTENG EAST CABLE ACCESSORIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the silicone rubber changes from a highly elastic state to a viscous flow state, and its mechanical and insulating properties are lost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The formula of a kind of high temperature resistant silicone rubber of the present invention is as follows:

[0016] Methyl vinyl silicone rubber raw rubber 100kg, polymetallic organosiloxane solid powder (particle size 1000 mesh) 72kg, alkoxy-terminated polysiloxane 24kg, dimethyldiethoxysilane 5.5kg, silanization Treat 21kg of hydrophobic fumed silica, 4.5kg of hydroxyl silicone oil, 2.5kg of low-hydrogen methyl silicone oil, 7kg of quartz powder, 1.5kg of diatomaceous earth, 1.5kg of barium silicate, and 0.25kg of calcium stearate;

[0017] Wherein, the methyl vinyl silicone rubber raw rubber includes 68 parts of methyl vinyl silicone rubber raw rubber with a vinyl content of 0.08%, 32 parts of methyl vinyl silicone rubber raw rubber with a vinyl content of 0.16%, and both The number average molecular weight is between 600,000 and 620,000.

[0018] The metal element of the polymetalloorganosiloxane is cerium.

[0019] The molecular formula of alkoxy-terminated poly...

Embodiment 2

[0023] The formula of a kind of high temperature resistant silicone rubber of the present invention is as follows:

[0024] Methyl vinyl silicone rubber raw rubber 100kg, polymetallic organosiloxane solid powder (particle size 1100 mesh) 70kg, alkoxy-terminated polysiloxane 23kg, dimethyldiethoxysilane 6kg, silanization treatment Hydrophobic fumed silica 22kg, hydroxy silicone oil 4kg, low hydrogen methyl silicone oil 2kg, quartz powder 8kg, diatomite 2kg, barium silicate 1kg, calcium stearate 0.20kg;

[0025] Wherein, the methyl vinyl silicone rubber raw rubber includes 66 parts of methyl vinyl silicone rubber raw rubber with a vinyl content of 0.07%, 34 parts of methyl vinyl silicone rubber raw rubber with a vinyl content of 0.17%, and both The number average molecular weight is between 600,000 and 620,000.

[0026] Among them, the metal element of the polymetallic organosiloxane is cerium.

[0027] The molecular formula of alkoxy-terminated polysiloxane is ROSi(CH 3 ) 2...

Embodiment 3

[0031] The formula of a kind of high temperature resistant silicon rubber of the present invention is as follows:

[0032] Methyl vinyl silicone rubber raw rubber 100kg, polymetallic organosiloxane solid powder (particle size 1050 mesh) 75kg, alkoxy-terminated polysiloxane 26kg, dimethyldiethoxysilane 5kg, silanization treatment Hydrophobic fumed silica 20kg, hydroxyl silicone oil 5kg, low hydrogen methyl silicone oil 3kg, quartz powder 6kg, diatomite 1kg, barium silicate 2kg, calcium stearate 0.30kg;

[0033] Wherein, the methyl vinyl silicone rubber raw rubber includes 70 parts of methyl vinyl silicone rubber raw rubber with a vinyl content of 0.09%, 30 parts of methyl vinyl silicone rubber raw rubber with a vinyl content of 0.15%, and the mixture of the two The number average molecular weight is between 600,000 and 620,000.

[0034] Among them, the metal element of the polymetallic organosiloxane is cerium.

[0035] The molecular formula of alkoxy-terminated polysiloxane ...

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Abstract

The invention provides high-temperature resistant silicone rubber. The high-temperature resistant silicone rubber is prepared from the following ingredients in parts by mass: 100 parts of methylvinyl silicone raw rubber, 70-75 parts of polyorganometallosiloxane, 23-26 parts of alkoxy-terminated polysiloxane, 5-6 parts of dimethyl diethoxy silane, 20-22 parts of gaseous white carbon black, 4-5 parts of hydroxy silicone oil, 2-3 parts of methyl silicone oil with low hydrogen content, 6-8 parts of quartz powder, 1-2 parts of diatomite, 1-2 parts of barium silicate and 0.20-0.30 part of calcium stearate, wherein the methylvinyl silicone raw rubber contains 68+/-2 parts (by weight) of methylvinyl silicone raw rubber with the vinyl content of 0.07-0.09% and 32+/-2 parts (by weight) of methylvinyl silicone raw rubber with the vinyl content of 0.15-0.17%, and the number-average molecular weight of the methylvinyl silicone raw rubber with the vinyl content of 0.07-0.09% and the methylvinyl silicone raw rubber with the vinyl content of 0.15-0.17% is between 600,000 and 620,000. The silicone rubber provided by the invention has excellent heat resistance.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a high-temperature-resistant silicone rubber. Background technique [0002] Silicone rubber is an elastic copolymer prepared by ring-opening polymerization of cyclic organosiloxanes or copolymerization with different siloxanes. During long-term operation, high temperature will promote the aging of silicone rubber. When the ambient temperature rises, the molecular chain of silicone rubber continuously gains energy, and when the temperature reaches its viscous fluidization temperature, the entire molecular chain moves freely and becomes a flowing mucus. At this time, the silicone rubber changes from a highly elastic state to a viscous flow state, and its mechanical and insulating properties are lost. Modern industry puts forward higher requirements on the heat resistance of silicone rubber, such as automotive hoses, electronic seals, wires and cables, hot stamping a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08L83/05C08L83/14C08K13/06C08K9/06C08K3/36C08K3/34C08K5/098C08K5/5419
Inventor 钱元平
Owner WUXI XINTENG EAST CABLE ACCESSORIES
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