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Blended fluorinated silicone rubber composition and preparation method thereof

A technology of fluorosilicone rubber and composition, which is applied in the field of fluorosilicone rubber, can solve the problems of lower production efficiency, different costs, blending failure, etc., and achieve the effects of good mechanical properties, good vulcanization effect, and convenient processing

Active Publication Date: 2020-04-10
福建拓烯新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this method has the following disadvantages: different applications have different requirements for the oil resistance of the material, and the acceptable cost is also different
However, in the application, we found that if the blended fluorosilicone rubber obtained by this method is not vulcanized after the blending process, it is placed at room temperature for about 2 days, and the phase separation of the silicone rubber and the fluorosilicone rubber occurs again, resulting in blending failure.
In actual production, due to factors such as order arrangement, accidents in production, and holidays, the blended fluorosilicone rubber must be placed for more than 2 days after blending, and the blended fluorosilicone rubber must be re-mixed and processed, reducing the Productivity

Method used

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  • Blended fluorinated silicone rubber composition and preparation method thereof
  • Blended fluorinated silicone rubber composition and preparation method thereof
  • Blended fluorinated silicone rubber composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Put 100 parts of fluorosilicone rubber, 100 parts of silicone rubber and 10 parts of polytrifluoropropylsiloxane-b-polydimethylsiloxane block copolymer with a viscosity of 3000mPa.s on the three-roll machine, and pass it three times , at 170°C, 250Kgf / cm 2 Vulcanized under pressure for 10 minutes, and then secondary vulcanized in an oven at 200°C for 4 hours to obtain blended fluorosilicone rubber 1.

Embodiment 2

[0042] Put 100 parts of fluorosilicone rubber, 70 parts of silicone rubber and 7 parts of polytrifluoropropylsiloxane-b-polydimethylsiloxane block copolymer with a viscosity of 4560mPa.s on the three-roll machine, and pass it three times , at 170°C, 250Kgf / cm 2Vulcanized under pressure for 10 minutes, and then secondary vulcanized in an oven at 200°C for 4 hours to obtain blended fluorosilicone rubber 2.

Embodiment 3

[0044] Put 100 parts of fluorosilicone rubber, 50 parts of silicone rubber and 6 parts of polytrifluoropropylsiloxane-b-polydimethylsiloxane block copolymer with a viscosity of 6220mPa.s on the three-roll machine, and pass it three times , at 170°C, 250Kgf / cm 2 Vulcanized under pressure for 10 minutes, and then secondary vulcanized in an oven at 200°C for 4 hours to obtain blended fluorosilicone rubber 3.

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Abstract

The invention relates to the field of fluorinated silicone rubber, and in particular, relates to a blended fluorinated silicone rubber composition and a preparation method thereof. The fluorinated silicone rubber disclosed by the invention is composed of the components in parts by mass: 100 parts of fluorinated silicone rubber, 20 to 100 parts of silicone rubber and 5 to 10 parts of a polytrifluoropropyl siloxane-b-polydimethylsiloxane block copolymer. The polytrifluoropropyl siloxane-b-polydimethylsiloxane block copolymer is used as an interface agent of the fluorinated silicone rubber and the silicone rubber; the compatibility of the fluorinated silicone rubber and the silicone rubber in a microcosmic region during mixing is improved, the fluorinated silicone rubber and silicone rubber blend shows the characteristic of uniform blending after vulcanization, and the blending effect is stable for a long time.

Description

technical field [0001] The invention relates to the field of fluorosilicone rubber, in particular to a blended fluorosilicone rubber composition and a preparation method. Background technique [0002] Fluorosilicone rubber has excellent properties such as oil resistance, high and low temperature resistance, and good processability, but its price is relatively high, and it is only used in some special occasions. Silicone rubber has high and low temperature resistance and good processability, and its price is low, but its oil resistance is poor. Therefore, copolymerized fluorosilicone rubber can be used in some occasions that require high and low temperature resistance but low oil resistance. Copolymerized fluorosilicone rubber is mainly processed by copolyfluorosilicone raw rubber and fumed silica as reinforcing fillers and with some additives. The content of trifluoropropyl methylsiloxane chain link in copolyfluorosilicone raw rubber determines the oil resistance of copoly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/08C08L83/04C08L83/10
CPCC08L83/08C08L83/04C08L2205/03C08L2205/08C08L83/10
Inventor 翁朝阳
Owner 福建拓烯新材料科技有限公司
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