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A kind of self-oil-penetrating low permanent compression deformation liquid silicone rubber and preparation method thereof

A permanent compression deformation, liquid silicone rubber technology, applied in the field of silicone rubber, can solve the problems of poor permanent compression deformation, loss of use value, reduction of compression set rate, etc.

Active Publication Date: 2021-09-10
SHENZHEN CITY SQUARE SILICONE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The thermal aging of silicone rubber is mainly manifested in two aspects: when oxidized in air at high temperature, due to the oxidation of side methyl groups, alkyl radicals are formed, and the performance of silicone rubber is reduced due to free radical coupling
When heated in a high-temperature airtight anaerobic system, the main chain network breaks and the hydroxyl group causes thermal rearrangement and degradation of the main chain, that is, a depolymerization reaction occurs, making the product soft, resulting in loss of mechanical strength and use value
At present, metal oxides (cerium oxide, iron oxide) are often added to prevent the oxidation of side methyl groups to reduce the compression set rate, but the products are colored and opaque. Poor permanent compression deformation, unable to meet the working requirements of self-seeping oil glue in a relatively anaerobic environment

Method used

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  • A kind of self-oil-penetrating low permanent compression deformation liquid silicone rubber and preparation method thereof
  • A kind of self-oil-penetrating low permanent compression deformation liquid silicone rubber and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] This embodiment provides a self-bleeding liquid silicone rubber composition with low permanent compression deformation and a preparation method thereof. The self-bleeding low permanent compression deformation liquid silicone rubber composition includes the following components in parts by mass:

[0027] The mass fraction of vinyl is 0.4% vinyl polydimethylsiloxane with rotational viscosity of 60000mPa.s (25°C): 33 parts; the mass fraction of vinyl is 0.4% of ethylene with rotational viscosity of 20000mPa.s (25°C) Vinyl polydimethylsiloxane: 33 parts; vinyl polydimethylsiloxane with a mass fraction of 1.5% and a rotational viscosity of 20000mPa.s (25°C): 8 parts; fumed silica: 28 Parts; fumed silica surface treatment agent: 6 parts; low pressure change control agent compound: 0.5 parts; catalyst with platinum metal content of 2000ppm: 1.0 part; hydrogen content of 1.0% hydrogen-containing silicone oil crosslinking agent: 2 parts; Oil seepage agent: 3 parts; Inhibitor: 0...

Embodiment 2

[0036] This embodiment provides a self-bleeding liquid silicone rubber composition with low permanent compression deformation and a preparation method thereof. The self-bleeding low permanent compression deformation liquid silicone rubber composition includes the following components in parts by mass:

[0037] The mass fraction of vinyl is 0.4% vinyl polydimethylsiloxane with rotational viscosity of 20000mPa.s (25°C): 69 parts; the mass fraction of vinyl is 1.5% of ethylene with rotational viscosity of 20000mPa.s (25°C) Vinyl polydimethylsiloxane: 4 parts; vinyl polydimethylsiloxane with a mass fraction of 0.8% and a rotational viscosity of 20000mPa.s (25°C): 2 parts; fumed silica: 27 Parts; Fumed silica surface treatment agent: 5 parts; Low pressure deformation control agent compound: 0.7 parts; Catalyst with platinum metal content of 2000ppm: 1.0 part; Hydrogen content of 0.4% hydrogen-containing silicone oil crosslinking agent: 2 parts; Oil seepage agent: 4 parts; Inhibito...

Embodiment 3

[0046] This embodiment provides a self-bleeding liquid silicone rubber composition with low permanent compression deformation and a preparation method thereof. The self-bleeding low permanent compression deformation liquid silicone rubber composition includes the following components in parts by mass:

[0047] The mass fraction of vinyl is 0.4% vinyl polydimethylsiloxane with rotational viscosity of 20000mPa.s (25°C): 74 parts; the mass fraction of vinyl is 1.5% of ethylene with rotational viscosity of 20000mPa.s (25°C) base polydimethylsiloxane: 4 parts; white carbon black: 27 parts; fumed silica surface treatment agent: 5 parts; low pressure change control agent compound: 0.3 parts; parts; hydrogen content of 0.4% hydrogen-containing silicone oil crosslinking agent: 1.5 parts; oil penetration agent: 5 parts; inhibitor: 0.05 parts.

[0048] Preparation of low-pressure deformation control agent compound and base rubber:

[0049] Under the condition of blowing nitrogen, 2136 ...

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Abstract

The invention provides a liquid silicone rubber with self-bleeding oil and low permanent compression deformation and a preparation method thereof. In parts by weight, the silicone rubber comprises the following components: 60-80 parts of vinyl polydimethylsiloxane, gas phase 20-40 parts of French silica, 1-10 parts of fumed silica treatment agent, 1-10 parts of oil bleeding agent, 1-10 parts of structural control agent, 1-10 parts of cross-linking agent, low pressure deformation control agent Compound 0.01-1 part, platinum catalyst 0.1-10 part, inhibitor 0.001-1 part. The oil seepage seal made of the self-oil seepage silicone rubber has a transparent appearance, and can maintain a low compression set rate under high-temperature aerobic conditions and anaerobic conditions.

Description

technical field [0001] The invention belongs to the technical field of silicone rubber, and relates to a liquid silicone rubber and a preparation method thereof, in particular to a self-seepage oil low permanent compression deformation liquid silicone rubber and a preparation method thereof. Background technique [0002] Due to its excellent physical properties and safety performance, silicone rubber is gradually showing its advantages in automobile manufacturing, and it is used more and more in auto parts, especially in gaskets and seals of automobiles. Automobiles require that the sealing ring used has self-lubricating effect, and more importantly, the compression deformation rate of the sealing ring should be low. The compression deformation rate of the sealing ring determines the safety of the car. [0003] The thermal aging of silicone rubber is mainly manifested in two aspects: when oxidized in air at high temperature, due to the oxidation of side methyl groups, alkyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/04C08L83/05C08K13/02C08K3/36C08K5/3472C08K5/5465
CPCC08L83/04C08L2201/08C08L2201/10C08L2205/025C08L2205/035C08K13/02C08K3/36C08K5/3472C08K5/5465
Inventor 李彦民张艳叶宁
Owner SHENZHEN CITY SQUARE SILICONE MATERIALS