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Preparation method of novel hot-vulcanized liquid silicone rubber

A liquid silicone rubber, thermal vulcanization technology, used in chemical instruments and methods, adhesives, other chemical processes, etc., can solve problems such as unfavorable product control applications, high energy consumption, etc.

Active Publication Date: 2017-05-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used moisture-cured and low-temperature vulcanized liquid silicone rubber is easily cured in advance during use due to the influence of moisture in the air and seasonal temperature, which is not conducive to the control application of the product in some occasions; and the high-temperature vulcanized liquid silicone rubber is due to The temperature is very high during vulcanization, and catalysts are used at the same time, so its application is sometimes limited. In addition, too high vulcanization temperature also means higher energy consumption

Method used

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  • Preparation method of novel hot-vulcanized liquid silicone rubber
  • Preparation method of novel hot-vulcanized liquid silicone rubber
  • Preparation method of novel hot-vulcanized liquid silicone rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of preparation method of novel thermal vulcanization liquid silicone rubber, comprises steps as follows:

[0041] (1) Add 200g D 4 and 20.2 g of 1,3-bis(3-aminopropyl)-1,1,3,3,-tetramethyldisiloxane were added to a reactor equipped with stirring, nitrogen conduit, thermometer and decompression device , adding 1% of the mass of the total reaction mass of the organic catalyst alkali glue, driving out the air, and raising the temperature to 100° C. for continuous reaction for 36 hours. Then raise the system temperature to 150°C to destroy the organic catalyst, and finally remove the low boilers under reduced pressure to obtain low molecular weight aminopropyl-terminated polydimethylsiloxane as the end-capping agent.

[0042] Weigh 200g D 4 Add 14g of end-capping agent into the reactor equipped with stirring, thermometer and decompression device, add the alkali gum of 2% of the total reaction material mass, react at 110°C for 8h, and then destroy the alkali glue at...

Embodiment 2

[0046] A kind of preparation method of novel thermal vulcanization liquid silicone rubber, comprises steps as follows:

[0047] (1), (2) are with embodiment 1;

[0048] (3) Weigh 40g of base rubber into a beaker, add 4g of fumed silica and stir evenly, then put it into an oven for heat treatment at 100°C for 40min. Then take out the sample, add 2.0g of low-molecular-weight silicone resin as a cross-linking agent, stir evenly, put it in a vacuum dryer at room temperature to remove air bubbles in a vacuum, take out the sample and pour it into a PTFE mold, and put it in an oven for curing at 100°C for 2 hours , That is, a new heat vulcanized liquid silicone rubber. Its mechanical properties are listed in Table 2.

Embodiment 3

[0050] A kind of preparation method of novel thermal vulcanization liquid silicone rubber, comprises steps as follows:

[0051] (1), (2) are with embodiment 1;

[0052] (3) Weigh 40g of base rubber into a beaker, add 2g of fumed silica and stir evenly, then add 2g of precipitated silica and stir evenly, then put it in an oven for heat treatment at 100°C for 40min. Then take out the sample, add 2.0g of low-molecular-weight silicone resin as a cross-linking agent, stir evenly, put it in a vacuum dryer at room temperature to remove air bubbles in a vacuum, take out the sample and pour it into a polytetrafluoroethylene mold, and let it stand for 20 minutes until the surface flows smoothly. Then put it in an oven and cure it at 100°C for 2 hours to obtain a new type of thermally vulcanized liquid silicone rubber. Its mechanical properties are listed in Table 1.

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Abstract

The invention relates to a preparation method of novel hot-vulcanized liquid silicone rubber. The preparation method comprises the following steps: (1) enabling D4 (octamethylcyclotetrasiloxane) to have a polymerization reaction with an end-capping reagent in presence of a catalyst to obtain base rubber; (2) adding a monomer A and a monomer B into an organic solvent to obtain a monomer mixture; adding the monomer mixture into a hydrolysis medium, and carrying out a hydrolysis reaction in presence of a hydrolysis catalyst to obtain silicon resin as a cross-linking agent, wherein the obtained silicon resin has different electrophilic group contents and has fluidity; (3) evenly mixing the base rubber, the cross-linking agent and filler, and then curing to obtain the novel hot-vulcanized liquid silicone rubber. The liquid silicone rubber prepared by the method is different from the condensed type, peroxide-crosslinking and hydrosilylation crosslinking systems of the traditional organic silicon rubber, and has a crosslinking mechanism of an amine ene reaction; the product is prepared from one component, can be cured when being heated at medium temperature, and can be stably stored at room temperature; the product with fluidity or thixotropy can be obtained by controlling the ratio of the filler, and can be used as a bonding agent or a sealant.

Description

technical field [0001] The invention relates to a preparation method of a novel thermally vulcanized liquid silicone rubber, which belongs to the technical field of silicone rubber. Background technique [0002] Silicone rubber has excellent performance and various varieties. As an excellent special rubber, silicone rubber has good heat resistance, low temperature resistance, insulation, shock resistance, compression resistance, wear resistance and good biological characteristics, making it widely used. Applications, such as construction, transportation, electronics, chemicals, biomaterials, and aerospace materials. Since it came out in the 1940s, research has developed rapidly, and two categories of high-temperature vulcanization and room temperature vulcanization have been formed, with tens of thousands of products. [0003] In recent years, the research focus of silicone rubber is mainly focused on how to improve the synthesis process to prepare high-performance silicone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/08C09J183/06C09J11/06C08L83/08C08L83/06C08K3/36C08G77/26C08G77/14C09K3/10
CPCC08G77/14C08G77/26C08L83/08C08L2205/02C08L2205/05C08L2312/00C09J11/06C09J183/08C09K3/10C08L83/06C08K3/36
Inventor 冯圣玉李晓晓封玲珑张洁
Owner SHANDONG UNIV
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