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Method for preparing formed liquid silicone rubber with low permanent compression deformation

A permanent compression deformation, liquid silicone rubber technology, applied in the field of silicone rubber materials, can solve the problems of poor compression resistance, large permanent compression deformation, short compression time, etc., to achieve high tensile strength and tear strength, permanent The effect of small compression deformation and wide application prospects

Active Publication Date: 2016-06-15
东莞新东方科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, silicone products on the market have poor compressive performance, short compressive time, and large compression deformation. For example, the component rollers made of silicone rubber used in printing equipment have large permanent compression deformation, which reduces the use of equipment. years, increasing the cost of maintenance and updating of instruments and equipment, silicone rubber with low permanent compression set has become an urgent demand in the industry

Method used

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  • Method for preparing formed liquid silicone rubber with low permanent compression deformation
  • Method for preparing formed liquid silicone rubber with low permanent compression deformation
  • Method for preparing formed liquid silicone rubber with low permanent compression deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of vinyl silicone oil:

[0037] In parts by weight, 100 parts of octamethylcyclotetrasiloxane are dehydrated, then 0.6 parts of vinyl double-caps and 2 parts of vinyl rings are added, and 0.3 parts of tetramethylammonium hydroxide is used as a catalyst. Equilibrium reaction at 120°C for 3 hours, then heated to 150°C to vacuumize and filter to remove small molecules to obtain vinyl silicone oil.

[0038] Preparation of liquid silicone rubber:

[0039] Mix 100 parts of vinyl silicone oil, 1.5 parts of tetramethyltetravinyl cyclotetrasiloxane and 2.5 parts of dimethyldiethoxysilane in parts by weight, add 20 parts of fumed silica, 45 parts of precipitated White carbon black, 25 parts of hexamethyldisilazane and 15 parts of water are kneaded in a kneader at a temperature of 55°C for 6 hours at the same time, and then heated to 130°C and vacuumed, the vacuum degree is above -0.09Mpa, Prepare the base rubber; the base rubber adopts a viscosity of 10000mpa s afte...

Embodiment 2

[0041] Preparation of vinyl silicone oil:

[0042] In parts by weight, 100 parts of octamethylcyclotetrasiloxane are dehydrated, then 0.6 parts of vinyl double-caps and 2 parts of vinyl rings are added, and 0.3 parts of tetramethylammonium hydroxide is used as a catalyst. Equilibrium reaction at 120°C for 3 hours, then heated to 150°C to vacuumize and filter to remove small molecules to obtain vinyl silicone oil.

[0043] Preparation of liquid silicone rubber:

[0044] Mix 100 parts of vinyl silicone oil, 0.3 parts of tetramethyltetravinylcyclotetrasiloxane and 0.45 parts of dimethyldiethoxysilane in parts by weight, add 11 parts of fumed silica, 23 parts of precipitated White carbon black, 10 parts of water and 20 parts of hexamethyldisilazane are kneaded and dispersed in a kneader at a temperature of 55°C for 6 hours at the same time, and then heated to 140°C and vacuumed, the vacuum degree is above -0.09Mpa , to obtain the base glue; the base glue is diluted with vinyl si...

Embodiment 3

[0046] Preparation of vinyl silicone oil:

[0047] In parts by weight, dehydrate 100 parts of octamethylcyclotetrasiloxane, then add 0.6 parts of vinyl double head and 2 parts of vinyl ring body, use 0.3 parts of potassium hydroxide as catalyst, at 120 °C After catalytic reaction for 3 hours, a crude product was obtained. Add 0.6 parts of glacial acetic acid to the crude product, heat up to 150°C, vacuumize, and filter to remove small molecules to obtain vinyl silicone oil.

[0048] Preparation of liquid silicone rubber:

[0049] Mix 100 parts of vinyl silicone oil, 3 parts of tetramethyltetravinylcyclotetrasiloxane and 4.5 parts of dimethyldiethoxysilane in parts by weight, add 35 parts of fumed silica, 70 parts of precipitated White carbon black, 20 parts of water and 30 parts of hexamethyldisilazane are kept at a temperature of 60°C for 4 hours, then heated to 150°C and vacuumed, and the vacuum degree is above -0.09Mpa to prepare the base glue; After the glue is diluted w...

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Abstract

The invention discloses a method for preparing formed liquid silicone rubber with low permanent compression deformation. The method is characterized in that the formed liquid silicone rubber is made of base rubber, silicone oil and 1-acetenyl cyclohexanol, and the liquid silicone rubber is prepared under the effects of platinum catalysts; the base rubber comprises vinyl silicone oil, 2, 4, 6, 8-tetravinyl-2, 4, 6, 8-tetramethylcyclotetrasiloxane, diethoxydimethylsilane, white carbon black, hexamethyl disilazane and water. The base rubber is made of the vinyl silicone oil, the 2, 4, 6, 8-tetravinyl-2, 4, 6, 8-tetramethylcyclotetrasiloxane, the diethoxydimethylsilane, the white carbon black, the hexamethyl disilazane and the water, the base rubber, the silicone oil and the 1-acetenyl cyclohexanol are mixed with one another, and accordingly the liquid silicone rubber with the low permanent compression deformation can be prepared under the effects of the platinum catalysts. Compared with the prior art, the method has the advantages that the liquid silicone rubber is high in tensile strength and tear strength, low in permanent compression deformation and long in service life, and accordingly the method has a broad application prospect.

Description

technical field [0001] The invention relates to the field of silicone rubber materials, in particular to a preparation method of low permanent compression deformation addition type liquid silicone rubber. Background technique [0002] At present, silicone products on the market have poor compressive performance, short compressive time, and large compression deformation. For example, the component rollers made of silicone rubber used in printing equipment have large permanent compression deformation, which reduces the use of equipment. The service life increases the cost of maintenance and renewal of instruments and equipment, and silicone rubber with low permanent compression set has become an urgent demand in the industry. Contents of the invention [0003] In view of the deficiencies in the prior art, one of the objectives of the present invention is to provide a method for preparing addition-type liquid silicone rubber with low permanent compression deformation, which c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08L83/04C08K13/02C08K3/36C08K5/5445C08K5/05
CPCC08K2201/014C08L83/04C08L2205/025C08L2205/03C08K13/02C08K3/36C08K5/5455C08K5/05
Inventor 王文明田玉文朱麟才
Owner 东莞新东方科技有限公司
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