Dimethyl diphenyl room-temperature vulcanized silicone rubber as well as production process and application thereof

A dimethyl diphenyl, room temperature vulcanization technology, applied in chemical instruments and methods, other chemical processes, coatings, etc., can solve the problems of very high raw material purity requirements, many steps, and reduced catalytic activity, and achieve outstanding durability Hot air aging performance, excellent comprehensive performance, and simple polymerization process

Inactive Publication Date: 2010-10-06
上海爱世博有机硅材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new compound described by this patented method simplifies its production processes while also improving their quality control compared to previous methods that required expensive starting ingredients like benzene or naphtha. It achieves these technical benefits through controllable addition of specific chemical substances during reaction between two types of molecules called reactants: vinylidrene monomer(BM)-styrenated polysiloxane resin(RTV). These reactions result in various forms of polydimethyldiphenylsilicon hydride (PDMS)). Overall, it provides an improved way to produce specialty plastic compositions containing PDMS without requiring costly extra steps from other sources.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the quality and yield of thermally cured silica gel compositions containing unsaturated organopolysils called monoorganophylls due to their unique chemical characteristics. These compounds contain multiple esters bondings between different atoms within each other, making it challenging to separate these components from each other without contaminants during manufacturing processes like forming blister packaging. Additionally, they cannot meet all three important qualities simultaneout against certain standards set forth in industry practice.

Method used

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  • Dimethyl diphenyl room-temperature vulcanized silicone rubber as well as production process and application thereof
  • Dimethyl diphenyl room-temperature vulcanized silicone rubber as well as production process and application thereof
  • Dimethyl diphenyl room-temperature vulcanized silicone rubber as well as production process and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Weigh the dimethyl diphenyl mixed ring body [(CH 3 ) 2 SiO] m [(C 6 h 5 ) 2 SiO] n ] m+n=4 (component I) 1225 g, dimethylcyclosiloxane (DMC) (component II) 2345 g and tetramethylammonium hydroxide aqueous solution 1.2 g (component III). Add the raw materials of the three components into the reaction pot, start stirring, turn on the vacuum pump, pass in dried nitrogen, adjust the vacuum degree, keep the residual pressure at 10-20mmHg, and start heating, when the temperature in the reactor reaches 60°C After dehydration at 60-70°C / 10-20mmHg for 20 minutes, reduce the vacuum until the residual pressure is around 200mmHg. When the temperature starts to rise to 100°C, keep it at 100-105°C for 2.0 hours, then remove the vacuum and start normal When the pressure drops to 90°C, add 7.0g of deionized water. When the temperature rises to 115°C, stir at 115-117°C under normal pressure for 1.0 hour, then raise the temperature to 180°C under normal pressure, maintain at 180-18...

Embodiment 2

[0056] Weigh respectively 980g of dimethyl diphenyl mixed ring body (component I), 2590g of dimethylcyclosiloxane (DMC) (component II) and 1.8g of tetramethylammonium hydroxide aqueous solution (component III) , 5.4 g of deionized water (component IV) was added to the reactor (the addition procedure was the same as in Example 1). Except that the formula is different, all other operations are carried out according to the steps of Example 1, and the viscosity of the final product obtained (η 25 ) is 12000mPa.s, phenyl content 16.4%, the surface vulcanization time (25°C) is 2.8 hours, and the volatile content is 1.32%.

Embodiment 3

[0058] Weigh respectively 910g of dimethyl diphenyl mixed ring body (component I), 2660g of dimethylcyclosiloxane (DMC) (component II) and 1.6g of tetramethylammonium hydroxide aqueous solution (component III) , deionized water (component IV) 14.2g was added to the reactor (the order of addition was the same as in Example 1). Except that the formula is different, all other operations are carried out according to the steps of Example 1, and the viscosity of the final product obtained (η 25 ) is 3500mPa.s, phenyl content 12.2%, the surface vulcanization time (25°C) is 2.5 hours, and the volatile content is 2.2%.

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Abstract

The invention relates to the technical field of new materials and fine chemical industries (special macromolecule materials), in particular to high-temperature resistant dimethyl diphenyl room-temperature vulcanized silicone rubber as well as a production process and application thereof. The high-temperature resistant dimethyl diphenyl room-temperature vulcanized silicone rubber is characterized by being synthesized through adopting the following four raw materials in percentage by weight: 20.0-34.0 percent of liquid dimethyl diphenyl mixing cyclosiloxane, 65.58-79.89 percent of dimethyl cyclosiloxane, 0.10-0.40 percent of water and 0.008-0.015 percent of tetramethylammonium hydroxide. Compared with the prior art, the invention has simple and convenient polymerization process and outstanding hot air aging resistance, is applied to the seal of an artificial satellite solar battery, a seal coating of a part of high and low temperature resistance, ablating resistance, ageing resistance and radiation resistance for an aviation industry, a vacuum system, electronic equipment and the insulation, seal, moisture prevention and vibration prevention of electrical elements and meets the harsh requirement of a space-grade product on a sealing material due to the alternating synergy of high vacuum and high and low temperature.

Description

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Claims

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Application Information

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Owner 上海爱世博有机硅材料有限公司
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