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Liquid silicone rubber and preparation method thereof

A technology of liquid silicone rubber and base rubber, which is applied in the field of silicone rubber, can solve the problems of low transparency and use of liquid fluorosilicone rubber, and achieve good oil resistance and wide application fields

Active Publication Date: 2020-02-04
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The F atom in the trifluoropropyl group has a greater electron-withdrawing effect, and the bond length of the C-F bond is shorter, which can form a better shielding effect on the C-C bond, greatly improving the oil resistance and solvent resistance of rubber, making it resistant to high temperatures. It is resistant to media such as aviation fuel, hydraulic oil, petroleum series and chemical reagents. It is an elastomer with good resistance to non-polar media at -68 ° C ~ 232 ° C. Liquid fluorosilicone rubber is mainly used in automobile manufacturing and aviation. Industry. At present, the application of liquid fluorosilicone rubber is further extended to consumer goods and medical care. However, conventional liquid fluorosilicone rubber has low transparency and is difficult to use in areas with high light transmission requirements.

Method used

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  • Liquid silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Liquid silicone rubber formula: It consists of the following raw material components in parts by weight: α, ω-divinylpolymethyltrifluoropropylsiloxane 100g, methylphenyl hydrogen silicone oil 5g, side chain vinyl copolymer Vinyl trifluoropropylsiloxane 10g, fumed silica 30g, processing aid 1g, catalyst 1g, inhibitor 0.1g.

[0029] α, ω-divinylpolymethyltrifluoropropylsiloxane has a viscosity of 4000mPa.s and a fluorine content of 30%.

[0030] The viscosity of methylphenyl hydrogen silicone oil is 150mPa.s.

[0031] The molar ratio of vinyl content to silicon-hydrogen bond content in the system is 1:1.1.

[0032] The specific surface area of ​​fumed silica is 300m 2 / g.

[0033] Processing aid hexamethyldisilazane.

[0034] The catalyst is a chloroplatinic acid-isopropanol complex with a platinum content of 3000ppm.

[0035] The inhibitor is acetylene alcohol.

[0036] The preparation method steps are as follows:

[0037] (1) Prepare base rubber: add 100gα,ω-divi...

Embodiment 2

[0042] Liquid silicone rubber formula: It consists of the following raw material components in parts by weight: α, ω-divinylpolymethyltrifluoropropylsiloxane 100g, methylphenyl hydrogen-containing silicone oil 2g, side chain vinyl copolymer Vinyl trifluoropropylsiloxane 20g, fumed silica 40g, processing aid 2g, catalyst 0.7g, inhibitor 0.07g.

[0043] α, ω-divinylpolymethyltrifluoropropylsiloxane has a viscosity of 6000mPa.s and a fluorine content of 50%.

[0044] The viscosity of methyl phenyl hydrogen silicone oil is 100mPa.s.

[0045] The molar ratio of vinyl content to silicon-hydrogen bond content in the system is 1:1.2.

[0046] The specific surface area of ​​fumed silica is 200m 2 / g.

[0047] Processing aid hexamethyldisilazane.

[0048] The catalyst is chloroplatinic acid-divinyltetramethyldisiloxane complex, and the platinum content is 3000ppm.

[0049] The inhibitor is acetylene alcohol.

[0050] The preparation method steps are as follows:

[0051] (1) Prepa...

Embodiment 3

[0056] Liquid silicone rubber formula: It consists of the following raw material components in parts by weight: α, ω-divinylpolymethyltrifluoropropylsiloxane 100g, methylphenyl hydrogen-containing silicone oil 1g, side chain vinyl copolymer Vinyl trifluoropropyl siloxane 5g, fumed silica 35g, processing aid 1.8g, catalyst 0.5g, inhibitor 0.05g.

[0057] α, ω-divinylpolymethyltrifluoropropylsiloxane has a viscosity of 10000mPa.s and a fluorine content of 80%.

[0058] The viscosity of methylphenyl hydrogen silicone oil is 100mPa.s.

[0059] The molar ratio of vinyl content to silicon-hydrogen bond content in the system is 1:1.3.

[0060] The specific surface area of ​​fumed silica is 250m 2 / g.

[0061] Processing aid hexamethyldisilazane.

[0062] The catalyst is a chloroplatinic acid-divinyltetramethyldisiloxane complex with a platinum content of 4000ppm.

[0063] The inhibitor is acetylene alcohol.

[0064] The preparation method steps are as follows:

[0065] (1) Prepa...

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Abstract

The invention provides liquid silicone rubber and a preparation method thereof. The liquid silicone rubber is prepared by mixing the following raw material components in parts by weight: 100 parts ofalpha,omega-divinyl polymethyltrifluoropropylsiloxane, 1-5 parts of methylphenyl polyhydrosiloxanes, 5-20 parts of side chain vinyl copolymethyl vinyl trifluoropropylsiloxane, 20-40 parts of fumed silica, 1-2 parts of processing aids, 0.5-1 part of catalyst and 0.01-0.1 part of an inhibitor. Compared with conventional addition liquid silicone rubber, the liquid silicone rubber is given with good oil resistance, corrosion resistance and low temperature resistance by introducing fluorine-containing groups; the liquid silicone rubber is given with good high and low temperature, damping, radiationresistance, physiological inertia, electrical performance and optical performance by introducing phenyl groups; and vinyl polymethyltrifluoropropylsiloxane and the methylphenyl polyhydrosiloxanes arecrosslinked and cured by hydrosilylation reaction under the action of a platinum catalyst to form a material with composite performance, so that the liquid silicone rubber has a wider application field.

Description

technical field [0001] The invention relates to the field of silicone rubber, in particular to a liquid silicone rubber and a preparation method thereof. Background technique [0002] In recent years, new energy vehicles have shown explosive growth. Silicone rubber is mainly used in special parts such as sealing, shock absorption, rubber hose, filling and coating, etc. With the development of sharing, the application of silicone rubber in automobiles will further increase, especially the increase of liquid silicone rubber is the most obvious. However, conventional liquid silicone rubber has problems such as poor oil resistance, poor solvent resistance, and poor light transmission performance. [0003] Fluorine-containing materials are widely used in cutting-edge science and technology such as aerospace, rockets, missiles, atomic energy, aviation, military industry, chemical industry, Machinery, electronic appliances, textiles, transportation, construction, medical care and...

Claims

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Application Information

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IPC IPC(8): C08L83/08C08L83/10C08K3/36C08G77/44
CPCC08L83/08C08G77/44C08L2205/025C08L2205/03C08L2201/08C08L2312/00C08L83/10C08K3/36
Inventor 李书兵陈泽雨孙刚李岩松
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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