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Preparation method of dealcoholized silicone sealant resistant to -110°C low temperature

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, material hardening and brittleness, etc., achieving long service life, eliminating low temperature resistance and eliminating crystallization temperature. Effect

Active Publication Date: 2016-05-18
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 silicone sealant resistant to -110°C low temperature
  • Preparation method of dealcoholized silicone sealant resistant to -110°C low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing a dealcoholized silicone O-ring with low temperature resistance of -110°C, the steps are as follows:

[0042] A. Put 80 parts by weight of α, ω-terminated hydroxyl polydiethyldimethylsiloxane (the molar content of diethylsiloxane chain unit is 17%) 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 12 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 －4 Pa, stirring at a s...

Embodiment 2

[0051] A method for preparing a dealcoholized silicone gasket resistant to low temperatures of -110°C, the steps are as follows:

[0052] A. Put 73 parts by weight of α, ω-terminated hydroxyl polydiethyldimethylsiloxane (the molar content of diethylsiloxane chain unit is 24%) 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;

[0053] 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;

[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 minut...

Embodiment 3

[0060] A method for preparing a dealcoholized silicone sealing block resistant to low temperatures of -110°C, the steps are as follows:

[0061] A. Put 66 parts by weight of α, ω-terminated hydroxyl polydiethyldimethylsiloxane (the molar content of diethylsiloxane chains is 30%) into the container, and stir at a speed of 50 rpm Next, add 0.3 parts by weight of hexamethyldisilazane as a water absorbent, and stir and mix for 15 minutes to prepare a mixed solution a;

[0062] 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;

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

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Abstract

The invention relates to a preparation method for a dealcoholization type organosilicon sealing element resisting -110DEG C low temperature. The steps includes: A. adding a moisture absorbent into alpha, omega-hydroxyl-terminated polydiethyl dimethyl siloxane, and conducting stirring mixing to obtain a mixed solution a; B. adding a reinforcing agent into the mixed solution a and performing stirring to obtain a mixed solution b; C. adding the mixed solution b into a planetary mixer, carrying out vacuum pumping and stirring to obtain a mixed solution c; D. under a vacuum condition, adding a dealcoholization type silane coupling agent into the mixed solution c, then adding a catalyst, and further performing stirring to obtain a pouring raw material; and E. adding the pouring raw material into a die loaded flat vulcanizing machine, conducting open placing under room temperature, then closing the die and performing room temperature vulcanization, thus obtaining the dealcoholization type organosilicon sealing element resisting -110DEG C low temperature, which has a glass-transition temperature Tg of -118DEG C and has no crystallization temperature.

Description

technical field [0001] The invention relates to a method for preparing a dealcoholized organic silicon sealing member capable of withstanding a low temperature of -110°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 co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/06C08K13/06C08K9/06C08K3/36C08K5/5445C08K5/29B29C35/02
Inventor 刘少杰李磊赵玉萍贾明岳冯圣玉
Owner 山东宝龙达实业集团有限公司
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