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Preparation method of dealcoholized organic silicon sealing element capable of resisting low temperature of -100 DEG C

A dealcoholized, silicone technology, applied in the field of fine chemicals, can solve the problems of application scope and field limitation, loss of sealing effect, hardening and brittle materials, etc. The effect of exhaust emissions

Active Publication Date: 2014-03-05
山东宝龙达实业集团有限公司
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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 dealcoholized organic silicon sealing element capable of resisting low temperature of -100 DEG C
  • Preparation method of dealcoholized organic silicon sealing element capable of resisting low temperature of -100 DEG C

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A method for preparing a -100°C low temperature resistant dealcoholized silicone O-ring, the steps are as follows:

[0042] A. Put 78 parts by weight of α, ω-terminated hydroxyl polydiphenyldimethylsiloxane (the molar content of diphenylsiloxane chains is 9.3%) 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;

[0043] B. The surface of 14 parts by weight is hydrophobically modified with hexamethyldisilazane, and the specific surface area is 200m 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;

[0044] C. Add the mixed liquid b prepared in step B into the planetary mixer, and evacuate to 1×10 －3 ~10 －4Pa, stirring at a speed of 30 ...

Embodiment 2

[0051] A method for preparing a dealcoholized silicone dense pad resistant to -100°C low temperature, the steps are as follows:

[0052] A. Put 72 parts by weight of α, ω-terminated hydroxyl polydiphenyldimethylsiloxane (the molar content of diphenylsiloxane chains is 9.7%) into the container, and stir at a speed of 50 rpm , adding 0.2 parts by weight of isocyanate as a moisture absorbing agent, stirring and mixing for 15 minutes to prepare a mixed solution a;

[0053] B, 20 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;

[0054] 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 ...

Embodiment 3

[0060] A method for preparing a dealcoholized silicone sealing block resistant to -100°C low temperature, the steps are as follows:

[0061] A. Put 66 parts by weight of α, ω-terminated hydroxyl polydiphenyldimethylsiloxane (the molar content of diphenylsiloxane chains is 10.2%) 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;

[0062] B. The surface of 24 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;

[0063] C. Add the mixed liquid b prepared in step B into the planetary mixer, and evacuate to 1×10 －3 ~10 －4 Pa, stirri...

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Abstract

The invention relates to a preparation method of a dealcoholized organic silicon sealing element capable of resisting the low temperature of -100 DEG C. The preparation method comprises the following steps of: A, adding a moisture absorbent to alpha, omega-hydroxy-terminated diphenyl dimethicone, and stirring and mixing to obtain a mixed solution a; B, adding a reinforcing agent to the mixed solution a, and stirring to obtain a mixed solution b; c, adding the mixed solution b to a planetary mixer, vacuumizing, and stirring to obtain a mixed solution c; D, adding a silane coupling agent to the mixed solution c under a vacuum condition, stirring, and then adding a catalyst, and continuing stirring to obtain a pouring raw material; E, adding the pouring raw material to a press vulcanizer in which a mold is loaded previously, placing open at the room temperature, and then closing the mold and vulcanizing at the room temperature to obtain the dealcoholized organic silicon sealing element. The dealcoholized organic silicon sealing element capable of resisting the low temperature of -100 DEG C prepared by the method provided by the invention can be vitrified at a temperature Tg=-104 DEG C; a crystallization temperature is avoided.

Description

technical field [0001] The invention relates to a preparation method of a dealcoholized silicone sealing member resistant to -100°C low temperature, belonging 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 cold regions, and high-spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08K5/5445C08K5/29C08K9/06C08K3/36
Inventor 曾庆铭李磊赵玉萍刘建萍贾明岳刘少杰
Owner 山东宝龙达实业集团有限公司