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Fluorosilicone rubber composition and preparation method

A technology of fluorosilicone rubber and composition, applied in the field of fluorosilicone rubber composition and preparation, can solve the problems of affecting hydrocarbon solvent resistance and oil resistance, serious roller sticking, affecting production efficiency and safety, etc. performance and high temperature resistance, improve mechanical properties, improve production efficiency

Active Publication Date: 2020-04-10
JIANGMEN SHENGPENG CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At the same time, pure fluorosilicone rubber (that is, the fluorosilicone raw rubber polymer chain used in fluorosilicone rubber only contains methyl (trifluoropropyl) siloxane chains and a small amount of methyl vinyl siloxane chains, and does not contain dimethyl Silicone-based silicone chain link) is more serious when the roller is mixed on the three-roller, which affects production efficiency and safety. For this reason, it is necessary to add a small amount (about 5% by weight) of silicone rubber, but it will affect the resistance to hydrocarbon solvents and oil resistance

Method used

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  • Fluorosilicone rubber composition and preparation method
  • Fluorosilicone rubber composition and preparation method
  • Fluorosilicone rubber composition and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0043] Preparation of cage polysilsesquioxane dialkoxysilanes

[0044] Preparation of Cage Polysilsesquioxane Methyldimethoxysilane

[0045] Add 10 parts of hepta(3,3,3-trifluoropropyl)vinyl cage polysilsesquioxane and 2 parts of methyldimethoxysilane into 20 parts of toluene, heat up to 90°C under stirring, and pass Into nitrogen protection, add Karstedt catalyst (according to Pt calculation, accounting for 5ppm of the total mass of reaction raw materials), continue to heat up to 120 ° C, react for 3 hours, and distill toluene and unreacted methyldimethoxysilane under reduced pressure to obtain cage Type polysilsesquioxane methyldimethoxysilane.

[0046] FT-IR analysis compares seven (3,3,3-trifluoropropyl) vinyl cage polysilsesquioxane and product cage polysilsesquioxane methyldimethoxysilane, at 1604cm -1 There is no absorption peak nearby, indicating that the vinyl reaction is relatively complete.

[0047] Preparation of Cage Polysilsesquioxane Methyldiethoxysilane

[...

preparation approach 3

[0052] Preparation scheme three: Accurately weigh each raw material, D 3 F and D 4 Vi Pre-dehydration treatment, 10 parts of cage polysilsesquioxane methyldimethoxysilane, 9 parts of D 3 F and 0.08 parts D 4 Vi Mix evenly, add alkali gel (calculated as sodium hydroxide, accounting for 0.01% of the weight of all reaction raw materials), stir and mix evenly, fill the whole reaction process with nitrogen protection, heat up to 140 ° C for 20 minutes, add the remaining 29 parts of D 3 F , continue to heat up to 150°C until the stirring bar cannot rotate, keep the temperature at 145-150°C for 1 hour, cool down, and release the glue to obtain fluorine-containing cage polysilsesquioxane modified fluorosilicone raw rubber 2-3 (abbreviated as fluorine Silicone Gum II-3).

preparation approach 4

[0053] Preparation scheme four: Accurately weigh each raw material, D 3 F and D 4 Vi Pre-dehydration treatment, 10 parts of cage polysilsesquioxane methyldiethoxysilane, 12 parts of D 3 F and 0.06 parts D 4 Vi Mix evenly, add alkali gel (calculated as sodium hydroxide, accounting for 0.01% of the weight of all reaction raw materials), stir and mix evenly, fill the whole reaction process with nitrogen protection, heat up to 140 ° C for 30 minutes, add the remaining 7 parts of D 3 F , continue to raise the temperature to 150°C until the stirring rod cannot rotate, keep the temperature at 145-150°C for 1 hour, cool down, and produce glue to obtain fluorine-containing cage polysilsesquioxane modified fluorosilicone raw rubber 2-4 (abbreviated as fluorine Silica gel II-4).

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Abstract

The invention relates to the technical field of rubber, in particular to a fluorosilicone rubber composition and a preparation method. The composition includes 0-100 parts of first raw fluorosiliconerubber, 100 parts of second raw fluorosilicone rubber modified by fluorine-containing polyhedral oligomeric silsesquioxane, 30-120 parts of fumed silica, 5-20 parts of hydroxyfluorosilicone oil the viscosity of which (at 25 DEG C) is 90-120 mPa.s, 0-10 parts of high-vinyl-content fluorosilicone oil, 1-3 parts of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane and 0-1 part of pigment, wherein the sidechain of polymer chains of the second raw fluorosilicone rubber modified by fluorine-containing polyhedral oligomeric silsesquioxane is trifluoropropyl polyhedral oligomeric silsesquioxane. The composition is not bonded to rollers during mixing in a three-roller machine, and has good mechanical strength, resistance to high temperature, resistance to fuel oil and good comprehensive performance after vulcanization.

Description

technical field [0001] The invention relates to the technical field of rubber, in particular to a fluorosilicone rubber composition and a preparation method. Background technique [0002] Fluorosilicone rubber, which introduces fluorine-containing groups on the side chain of the Si-O main chain, combines the heat resistance, cold resistance, and weathering resistance of silicone materials with the hydrocarbon solvent and oil resistance of organic fluorine materials. It is the only elastomer that is resistant to non-polar media at -68°C to 232°C, especially suitable for applications that require high temperature resistance and fuel resistance, such as seals, hoses, rubber pads and impregnated products, etc. , has a wide range of applications in the automotive industry, aerospace industry, petrochemical industry and other fields. [0003] However, compared with silicone rubber, fluorosilicone rubber has slightly poorer high temperature resistance and lower mechanical strength...

Claims

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Application Information

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IPC IPC(8): C08L83/08C08K7/26
CPCC08L83/08C08L2205/035C08L2205/025C08L2201/08C08K7/26
Inventor 陈志强
Owner JIANGMEN SHENGPENG CHEM IND CO LTD
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