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Preparation method of deoxime-type silicone sealant resistant to low temperature of -120°C

A deoximation type, silicone technology, applied in the direction of chemical instruments and methods, other chemical processes, etc., can solve the problems of application range and field limitations, material hardening and brittleness, loss of sealing effect, etc., to achieve long service life, eliminate Crystallization temperature, eliminating the effect of low temperature resistance

Active Publication Date: 2015-10-21
山东宝龙达新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many types of silicone sealants in use in China, most of which are produced using α, ω-terminated hydroxyl polydimethylsiloxane as the basic raw material. The side chains in its molecular structure are all methyl groups, which are unconventional. When the ambient temperature reaches -50°C, crystallization will occur, causing the material to become hard and brittle, losing the sealing effect, and the application range and field are limited.

Method used

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  • Preparation method of deoxime-type silicone sealant resistant to low temperature of -120°C
  • Preparation method of deoxime-type silicone sealant resistant to low temperature of -120°C

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A method for preparing a -120°C low-temperature-resistant deoximated silicone O-ring, the steps of which are as follows:

[0043] A. Put 80 parts by weight of α, ω-terminated hydroxyl polydiethyldimethylsiloxane (the molar content of diethylsiloxane chain unit is 15%) into the container, and stir at a speed of 50 rpm , adding 0.2 parts by weight of hexamethyldisilazane as a moisture absorber, stirring and mixing for 30 minutes to prepare a mixed solution a;

[0044] B. The surface of 12 parts by weight is hydrophobically modified with hexamethyldisilazane, and the specific surface area is 150m 2 / g of fumed white carbon black was slowly added to the mixed solution a prepared in step A under stirring conditions, and stirred for 2 hours at a stirring speed of 50 rpm to prepare mixed solution b, which was left to stand for subsequent use;

[0045] C. Add the mixed liquid b prepared in step B into the planetary mixer, and evacuate to 1×10 －3 ~10－4 Pa, stirring at a speed ...

Embodiment 2

[0052] A method for preparing a -120°C low-temperature-resistant deoximated silicone gasket, the steps are as follows:

[0053] A. Put 73 parts by weight of α, ω-terminated hydroxyl polydiethyldimethylsiloxane (the molar content of diethylsiloxane chain unit is 20%) into the container, and stir at a speed of 50 rpm , adding 0.2 parts by weight of isocyanate as a moisture absorber, stirring and mixing for 15 minutes to prepare a mixed solution a;

[0054] B, 19 parts by weight surface has been D 4 Hydrophobically modified, with a specific surface area of ​​150m 2 / g of fumed white carbon black was slowly added to the mixed solution a prepared in step A under stirring conditions, and stirred for 3.5 hours at a stirring speed of 30 rpm to prepare the mixed solution b, which was left to stand for subsequent use;

[0055] C. Add the mixed liquid b prepared in step B into the planetary mixer, and evacuate to 1×10 －3 ~10 －4 Pa, stirring at a speed of 30 rpm for 30 minutes, degass...

Embodiment 3

[0061] A method for preparing a -120°C low-temperature-resistant deoximated silicone sealing block, the steps are as follows:

[0062] A. Put 66 parts by weight of α, ω-terminated hydroxyl polydiethyldimethylsiloxane (the molar content of diethylsiloxane chains is 25%) into the container, and stir at a speed of 50 rpm , adding 0.3 parts by weight of hexamethyldisilazane as a moisture absorber, stirring and mixing for 15 minutes to prepare a mixed solution a;

[0063] B. The surface of 25 parts by weight has been hydrophobically modified with dimethyldichlorosilane, and the specific surface area is 120m 2 / g of fumed white carbon black was slowly added to the mixed solution a prepared in step A under stirring conditions, and stirred for 3 hours at a stirring speed of 30 rpm to prepare mixed solution b, which was left to stand for subsequent use;

[0064] C. Add the mixed liquid b prepared in step B into the planetary mixer, and evacuate to 1×10 －3 ~10 －4 Pa, stirring at a sp...

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Abstract

The invention relates to a preparation method of an oxime-removing type organic silicon sealing component capable of resisting low temperature of 120 DEG C below zero. The method comprises the following steps: A, adding a moisture absorbent into alpha, omega-hydroxyl-terminated poly-diethyl dimethyl siloxane, and stirring and mixing to prepare mixed liquid a; B, adding a reinforcing agent into the mixed liquid a and stirring to prepare mixed liquid b; adding the mixed liquid b into a planetary mixer, vacuumizing and stirring to prepare mixed liquid c; D, adding an oxime-removing type silane coupling agent mixture, stirring, adding a catalyst and continuously stirring to prepare a pouring raw material; E, adding the pouring raw material into a flat vulcanizing machine with a mould, placing at the room temperature in an opening manner, closing the mould and vulcanizing at the room temperature to prepare the oxime-removing type organic silicon sealing component capable of resisting low temperature of 120 DEG C below zero. According to the oxime-removing type organic silicon sealing component capable of resisting low temperature of 120 DEG C below zero, the glass transition temperature Tg is equal to 124 DEG C below zero and crystallization temperature is avoided.

Description

technical field [0001] The invention relates to a method for preparing a deoxime-type organic silicon sealing member capable of withstanding a low temperature of -120°C, and belongs to the technical field of fine chemicals. Background technique [0002] Silicone rubber has good elasticity, insulation and aging resistance. Due to its special molecular structure, it has excellent sealing effect and is widely used. Ordinary silicone rubber has a reliable sealing effect in the temperature range of -50°C to 280°C. However, under low temperature conditions, due to the reduction of molecular thermal movement in the silicone sealant material, the molecular segments will become stiff or even frozen, making the silicone rubber lose its elasticity, resulting in poor sealing effect or even loss of sealing effect. Therefore, when sealing materials are applied to equipment and areas such as spacecraft, aircraft, ultra-low temperature refrigerators, construction machinery in extremely col...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/06C08K13/06C08K9/06C08K5/5465C08K5/5445C08K5/29C08K3/36C09K3/10
Inventor 刘少杰赵玉萍李磊贾明岳冯圣玉
Owner 山东宝龙达新材料有限公司
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