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A kind of low hardness two-component addition type liquid fluorosilicone rubber and its preparation method

A liquid fluorosilicon, addition molding technology, applied in the field of rubber materials, can solve the problem of reducing the yield of base rubber, and achieve the effect of improving reactivity, excellent physical and mechanical properties, and ensuring cross-linking activity

Active Publication Date: 2022-03-11
威海新元新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the different ring-opening activities of the reaction raw materials, the tetramethylammonium hydroxide alkali gel catalyst will play a balancing role in the reaction during the polymerization process, resulting in a decrease in the yield of the base rubber

Method used

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  • A kind of low hardness two-component addition type liquid fluorosilicone rubber and its preparation method
  • A kind of low hardness two-component addition type liquid fluorosilicone rubber and its preparation method
  • A kind of low hardness two-component addition type liquid fluorosilicone rubber and its preparation method

Examples

Experimental program
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preparation example Construction

[0050] 1. Preparation of Fluorosilicone Base Rubber 1

[0051] Add 5000g of trimethyltris(3,3,3-trifluoropropyl)cyclotrisiloxane to the reaction kettle equipped with stirring and thermometer, and carry out dehydration treatment under the conditions of 60-80℃ and -0.099MPa for 2h ; After the dehydration was completed, adopt high-purity nitrogen to recover the pressure, and add 55g 1-vinyl-3-hydroxyl-1,1,3,3-tetramethyldisiloxane (purity 96%) and 4.2 g sodium fluorosiliconate catalyst (NaOH content 3.95%), turn on the heating, raise the temperature to 120-130°C for polymerization reaction, after the reaction starts, vacuumize to -0.05MPa and keep stirring for 3h; then, add 70g of 1-vinyl -3-Acetoxy-1,1,3,3-tetramethyldisiloxane (purity 98%) was neutralized and capped, and kept stirring for 8 hours; under the pressure of -0.099MPa, the system was heated to 200-220°C, remove small molecules with low boiling points, and cool down to obtain fluorosilicone base rubber 1, the structu...

Embodiment 1

[0068] The preparation of low-hardness two-component addition type liquid fluorosilicone rubber comprises the following steps:

[0069] (1) Add 1000g of fluorosilicone base rubber 1 (viscosity 30800cp, vinyl mass fraction 0.20%) into the vacuum kneader, and add 300g of fumed silica (hexamethyldisilazane hydrophobically modified , specific surface area 220m 2 / g, carbon content 3.05%) were added sequentially, and kneaded for 0.5h after each addition, then heated up to 180°C and kneaded for 1h, vacuumed to a pressure of -0.098MPa, continued kneading for 2h, and then lowered to room temperature;

[0070] (2) Take out the rubber material after kneading treatment, and use a three-roller grinder to pass it 3-5 times until the rubber material is uniform and fine, and there are no visible agglomerated particles;

[0071] (3) Take out 100g of the fully ground rubber material and place it on a three-roller grinder, add 0.7g of platinum catalyst (3000ppm of platinum content), 1g of ceri...

Embodiment 2

[0079] The preparation of low-hardness two-component addition type liquid fluorosilicone rubber comprises the following steps:

[0080] (1) Add 1000g of fluorosilicone base rubber 1 (viscosity 30800cp, vinyl mass fraction 0.20%) into the vacuum kneader, and add 300g of fumed silica (hexamethyldisilazane hydrophobically modified , specific surface area 220m 2 / g, carbon content 3.05%) were added sequentially, and kneaded for 0.5h after each addition, then heated up to 180°C and kneaded for 1h, vacuumed to a pressure of -0.098MPa, continued kneading for 2h, and then lowered to room temperature;

[0081] (2) Take out the rubber material after kneading treatment, and use a three-roller grinder to pass it 3-5 times until the rubber material is uniform and fine, and there are no visible agglomerated particles;

[0082] (3) Take out 100g of the fully ground rubber material and place it on a three-roller grinder, add 1g of platinum catalyst (3000ppm of platinum content), 1.5g of cerium...

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Abstract

The invention relates to a low-hardness two-component addition type liquid fluorosilicone rubber and a preparation method thereof. The rubber is formed by mixing two components A and B according to a mass ratio of 1:1, and component A includes: 85-90 parts Fluorosilicone base rubber, 15-25 parts of fumed silica, 0.5-1.5 parts of platinum catalyst, 0.5-1.5 parts of heat-resistant additive; component B includes: 70-75 parts of fluoro-silicon base rubber, 15-20 parts of gas phase method Silica, 15-20 parts of fluorosilicone crosslinking agent, 0.1-0.5 parts of inhibitor, 0.5-1.5 parts of heat-resistant additive. The present invention also provides a preparation method of the above-mentioned fluorosilicone rubber. The fluorosilicone base rubber used in the present invention not only ensures the crosslinking activity of vinyl but also does not damage the oil resistance of fluorosilicone rubber. The fluorosilicone crosslinking agent used has good compatibility with the base rubber, and greatly improves the silicone Due to the reactivity of hydrogen, the prepared fluorosilicone rubber has good fluidity, low shrinkage rate and excellent tensile strength. The preparation method is simple and easy, the cost is low, and it can be produced on a large scale.

Description

technical field [0001] The invention relates to the technical field of rubber materials, in particular to a low-hardness two-component addition type liquid fluorosilicone rubber and a preparation method thereof. Background technique [0002] Addition-type liquid fluorosilicone rubber is a liquid polymer material that undergoes an addition reaction between silicon vinyl in the fluorosilicone base rubber and silicon hydrogen in the fluorosilicone crosslinking agent. It is a higher-grade variety of fluorosilicone rubber. It has excellent processing performance, short processing cycle, controllable operation time, allows a large number of continuous operation construction, low scrap rate, high production efficiency, easy to use, wide application, various types, small product shrinkage, deep vulcanization, and On-site molding and other advantages, and also has excellent oil resistance, the application prospect is very broad. [0003] At present, the structure of the addition-typ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/08C08K13/06C08K9/06C08K7/26C08K3/22
CPCC08L83/08C08L2205/025C08L2312/00C08K2201/006C08K2003/2213C08K13/06C08K9/06C08K7/26C08K3/22
Inventor 于鹏飞解乐福田志钢侯志伟夏子祥丛洋王华杰
Owner 威海新元新材料有限公司
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