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High-strength and high-hardness fluorinated silicone rubber composition and preparation method thereof

A fluorosilicone rubber and high hardness technology, applied in the field of high-strength and high-hardness fluorosilicone rubber composition and its preparation, can solve the problems of decreased elasticity, increased viscosity of mixed rubber, decreased processing performance, etc.

Inactive Publication Date: 2017-01-04
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple selection of high molecular weight fluorosilicone rubber cannot meet the requirements of high strength and high hardness at the same time, and the addition of silicone oil type release agent will affect the shearing and mixing effect of the rubber material, resulting in uneven mixing
[0006] The Chinese journal "Development of High-Strength Fluorosilicone Rubber Compounds" mentions that in order to improve the strength of fluorosilicone rubber vulcanizates, fluorosilicone rubber with a raw rubber molecular weight of 900,000-1.2 million is selected, and white rubber with a large surface area and high activity is used. Carbon black, and the use of processing aids that can promote crosslinking can increase the strength of fluorosilicone rubber vulcanizates, but the elasticity decreases, the viscosity of the compound increases, and the processing performance decreases
[0007] In the Chinese journal "Structure and Mechanical Properties of Nano-Silicon Oxide Reinforced Fluorosilicone Rubber", the melt compounding method is used to prepare nano-silica-reinforced copolymerized fluorosilicone rubber. This method is used to improve the strength of fluorosilicone rubber and the dispersion of silica. And the specific surface area requirements are high, and in order to improve the dispersion effect, it is necessary to increase the hydroxyl fluorosilicone oil, which will have a negative impact on the final strength

Method used

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  • High-strength and high-hardness fluorinated silicone rubber composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of fluorosilicone raw rubber, the steps are as follows:

[0033] In the 500mL reactor, add 100g tetramethyltetravinyl cyclotetrasiloxane, then add 100g silanolate potassium salt catalyst (it is potassium hydroxide and methyl trifluoropropyl cyclotrisiloxane by mass ratio 2 :80 reaction), dehydration, stirring reaction under nitrogen protection, and reaction at a polymerization temperature of 120°C for 0.25h to obtain a prepolymer. Add 200g of the obtained prepolymer and methyltrifluoropropylcyclotrisiloxane into the reactor at a mass ratio of 3kg, dehydrate, replace with nitrogen, and carry out stirring reaction under the protection of nitrogen, at a polymerization temperature of 110°C React at low temperature for 2 hours, raise the temperature to 120°C, evacuate for 30 minutes, remove small molecular substances in the material, cool down and discharge the material. Obtain colorless and transparent fluorosilicone rubber raw rubber, sample and analyze af...

Embodiment 2

[0036] The preparation of fluorosilicone raw rubber is as described in Example 1, except that the amount of tetramethyltetravinylcyclotetrasiloxane is 200g, the polymerization temperature is 100°C, and the time is 2h. The obtained prepolymer The amount is 300g and methyltrifluoropropylcyclotrisiloxane is added to the reactor at a mass ratio of 3kg to react, the polymerization temperature is 100°C, the reaction time is 3h, and the evacuation temperature is 130°C. The performance indicators of fluorosilicone raw rubber are shown in Table 1.

Embodiment 3

[0038] The preparation of fluorosilicone raw rubber is as described in Example 1, except that the amount of tetramethyltetravinylcyclotetrasiloxane is 50 g, the polymerization temperature is 110 ° C, and the time is 1 h. The obtained prepolymer The amount is 150g and methyltrifluoropropylcyclotrisiloxane is added to the reactor at a mass ratio of 3kg to react, the polymerization temperature is 90°C, the reaction time is 4h, and the evacuation temperature is 125°C. The performance indicators of fluorosilicone raw rubber are shown in Table 1.

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Abstract

The invention relates to a high-strength and high-hardness fluorinated silicone rubber composition and a preparation method thereof, and belongs to the technical field of rubber. The high-strength and high-hardness fluorinated silicone rubber composition comprises the following raw materials in parts by mass: 100 parts of raw fluorinated silicone rubber, 35 to 65 parts of fumed silica, 3 to 7 parts of a heat-resistant additive, 0.5 to 2.0 parts of vulcanizing agents and 5 to 8 parts of a structure controlling agent. In the mixing process, a vinylsiloxane rubber vulcanizing agent and a universal silicone rubber vulcanizing agent are used simultaneously, and the vulcanization reaction degree of the fluorinated silicone rubber is increased under the synergistic effect of the vinylsiloxane rubber vulcanizing agent and the universal silicone rubber vulcanizing agent; heat treatment and segmental vulcanization methods are adopted in the processing process, so that the micromolecule content of the fluorinated silicone rubber composition is reduced, the cross-linking degree of the whole system is increased, and the high-strength and high-hardness fluorinated silicone rubber composition is obtained.

Description

technical field [0001] The invention relates to a high-strength and high-hardness fluorosilicone rubber composition and a preparation method thereof, belonging to the technical field of rubber. Background technique [0002] Fluorosilicone rubber is a special synthetic rubber material whose main chain is siloxane structure, and the side chain is fluorine-containing alkyl group, fluorine-containing aryl group, methyl group and vinyl structure. It not only has the superior heat resistance of siloxane , weather resistance, hydrophobicity and mold release, and has the advantages of excellent oil resistance and solvent resistance of fluorine-containing compounds, and can be widely used in important sectors such as automobiles, aerospace, petrochemicals, machinery, and national defense, transportation, electronics, etc. Electrical and other fields. [0003] However, the strength of unreinforced fluorosilicone rubber is extremely low and has no practical value, so fluorosilicone ru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/08C08K13/02C08K5/14C08K3/36C08K3/22C08G77/385C08G77/08B29C35/02B29B7/72B29B7/28
CPCB29B7/28B29B7/72B29C35/02C08G77/08C08G77/385C08K2201/006C08K2201/014C08L83/08C08L2205/025C08K13/02C08K5/14C08K3/36C08K2003/2272
Inventor 王汉利岳广孟祥青徐丽娟张伟曹兵
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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