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Preparation method of ultralow-viscosity vinyl silicone oil

A technology of vinyl silicone oil and ultra-low viscosity, which is applied in the field of preparation of ultra-low viscosity vinyl silicone oil, which can solve problems such as difficult to achieve, and achieve the effect of meeting synthesis requirements, stable storage, and wide application

Inactive Publication Date: 2021-01-29
RUNHE ORGANICSILICONE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-viscosity silicone oil disclosed in this patent is hydroxyl-terminated, and there are some vinyl silicone oils on the side chain, but it is difficult to achieve vinyl-terminated silicone oil.

Method used

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  • Preparation method of ultralow-viscosity vinyl silicone oil
  • Preparation method of ultralow-viscosity vinyl silicone oil
  • Preparation method of ultralow-viscosity vinyl silicone oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 2500g of dimethylsiloxane mixed ring body to the flask, vacuumize at 75°C for 1 hour, then add 330g of tetramethyldivinyldisiloxane at room temperature, then add 1.25g of acid catalyst, start to heat up, 40 Stir and react at a constant temperature for 12 hours, then add 4g of sodium bicarbonate to neutralize and react for 2 hours, filter with negative pressure medium-speed filter paper to obtain a colorless transparent liquid, and finally remove the components at a constant temperature of 150°C for 2 hours to obtain ultra-low viscosity vinyl Silicone oil A.

Embodiment 2

[0027] Add 2500g of dimethylsiloxane mixed ring body to the flask, vacuumize at 75°C for 1 hour, drop to room temperature, add 330g of tetramethyldivinyldisiloxane, then add 1.25g of acidic catalyst, and start to heat up to 80°C ℃, stirred at constant temperature for 5 hours, then added 4g of sodium bicarbonate to neutralize and reacted for 1 hour, then filtered through negative pressure medium-speed filter paper to obtain a colorless transparent liquid, and finally removed components at a constant temperature of 150°C for 3 hours to obtain ultra-low viscosity ethylene base silicone oil B.

Embodiment 3

[0029] Add 2500g of dimethylsiloxane mixed ring body to the flask, vacuumize at 75°C for 1 hour, drop to room temperature, add 477g of tetramethyldivinyldisiloxane, then add 95g of cation exchange resin, and start to heat up to 80 React at ~100°C for 12 hours. After the reaction is completed, filter out the cation exchange resin (reusable) to obtain a colorless transparent liquid, and then raise the temperature to 180°C with nitrogen gas to remove components at a constant temperature for 1 hour to obtain ultra-low viscosity vinyl silicone oil C. .

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Abstract

The invention relates to a preparation method of ultralow-viscosity vinyl silicone oil. The method comprises the following steps: reacting a dimethylsiloxane mixed ring body with tetramethyldivinyldisiloxane in the presence of an acidic catalyst, and neutralizing the acidic catalyst by using an alkali or alkali salt to prepare the ultralow-viscosity vinyl silicone oil. The viscosity of the vinyl silicone oil obtained by the method is lower than 50mm<2> / s and can be lower than 20mm<2> / s at most. The product is stable in storage, simple in production operation and easy to produce. The application range in the liquid glue is wider, and the synthesis requirements of other organic silicon modification can also be met.

Description

technical field [0001] The application relates to a preparation method of ultra-low viscosity vinyl silicone oil. Background technique [0002] Vinyl silicone oil is the main raw material for the preparation of addition-type liquid silicone rubber, silicone potting glue, etc. At present, the most commonly used structure in the market is vinyl-terminated polydimethylsiloxane, and the viscosity of vinyl silicone oil with this structure is concentrated It ranges from 1 million to 100,000, and products with different viscosities will be selected according to the requirements of operation and performance of silica gel. When preparing some liquid glues that require fluidity, products with lower viscosity will be required. [0003] There are many ways to synthesize vinyl silicone oil, but the conventional acid-base catalyzed ring-opening equilibrium preparation of vinyl silicone oil can only achieve a minimum of 50mm 2 / s, lower viscosity vinyl silicone oil is difficult to do. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/20C08G77/08C08G77/06
CPCC08G77/20C08G77/08C08G77/06
Inventor 李童成叶星晨孙云梅易有彬许银根
Owner RUNHE ORGANICSILICONE NEW MATERIAL
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