A kind of low-viscosity vinyl silicone oil and preparation method thereof

A vinyl silicone oil, low viscosity technology, applied in the direction of adhesives, etc., can solve the problems of low molecular weight, influence efficiency, excessive viscosity, etc., and achieve the effect of good leveling effect, low production cost and suitable hardness

Active Publication Date: 2019-06-25
新亚制程(浙江)股份有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the viscosity of low-viscosity vinyl silicone oil on the market is mainly concentrated in the range of 200-300cps. When making two-component addition-type liquid encapsulants, problems such as excessive viscosity and poor fluidity are prone to occur, and the yield is low. Many low molecular weights affect benefits

Method used

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  • A kind of low-viscosity vinyl silicone oil and preparation method thereof
  • A kind of low-viscosity vinyl silicone oil and preparation method thereof

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preparation example Construction

[0018] A preparation method of low-viscosity vinyl silicone oil, comprising the following steps:

[0019] 1) Vacuumize the mixed ring body of dimethylsiloxane, and then add acid for pretreatment;

[0020] 2) Add the basic catalyst and tetramethyldivinyldisiloxane to fully react;

[0021] 3) The product of step 2) is deintermediated, the basic catalyst is removed, and then vacuumized to obtain a low-viscosity vinyl silicone oil.

[0022] Preferably, the ratio of the mixed rings of dimethylsiloxane, acid, basic catalyst, and tetramethyldivinyldisiloxane is 1L: (2-10) g: (2-10) g: (8-30) g.

[0023] Preferably, the acid is at least one of sulfuric acid, hydrochloric acid, oxalic acid and acetic acid.

[0024] Further preferably, the acid is oxalic acid.

[0025] Preferably, the basic catalyst is prepared by the following method: dimethylsiloxane mixed ring body, methanol solution of inorganic base and methanol solution of tetramethylammonium hydroxide in a mass ratio of 1:(0....

Embodiment 1

[0032] Add 2.5L dimethylsiloxane mixed ring body to the reaction kettle, vacuumize at 80°C for 1 hour, add 10g oxalic acid for pretreatment, then add 10g basic catalyst, add 50g tetramethyldivinyl di Siloxane, stirred and reacted at a constant temperature of 120°C for 3 hours, then removed the medium at a constant temperature of 140°C for 1 hour, and finally de-lowered at a constant temperature of 180°C for 3 hours to obtain a low-viscosity vinyl silicone oil.

Embodiment 2

[0034] Add 3L dimethylsiloxane mixed ring body to the reaction kettle, vacuumize at 80°C for 0.5h, add 6g oxalic acid for pretreatment, then add 6g basic catalyst, add 24g tetramethyldivinyl di Siloxane, stirred and reacted at a constant temperature of 80°C for 2h, then removed the medium at a constant temperature of 140°C for 0.5h, and finally de-lowered at a constant temperature of 180°C for 1h to obtain a low-viscosity vinyl silicone oil.

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Abstract

The invention discloses low-viscosity vinyl silicone oil and a preparation method thereof. The preparation method of the low-viscosity vinyl silicone oil comprises the following steps that 1, a dimethyl siloxane hybrid ring is subjected to vacuumizing devolatiligation and then pretreated by adding acid; 2, a basic catalyst and 1,3-divinyltetramethyldisiloxane are added, and full reacting is conducted; 3, a product obtained in the step 2 is subjected to medium removal to remove the basic catalyst and then subjected to vacuumizing devolatiligation, and the low-viscosity vinyl silicone oil is obtained. The low-viscosity vinyl silicone oil is colorless and transparent, the viscosity is only 80-90 cps, the product yield reaches 93% or above, the storage stability is good, and a two-component pouring sealant prepared from the low-viscosity vinyl silicone oil has the advantages of being low in viscosity, good in leveling effect, appropriate in hardness and the like. The preparation method has the advantages that operation is easy, the production cost is low, and industrialized production is easy to achieve.

Description

technical field [0001] The invention relates to a low-viscosity vinyl silicone oil and a preparation method thereof. Background technique [0002] Low-viscosity vinyl silicone oil has stable properties and low volatile content, and is the main raw material for the preparation of addition-type liquid silicone rubber, silicone potting materials, silicone rubber, etc. At present, the viscosity of low-viscosity vinyl silicone oil on the market is mainly concentrated in the range of 200-300cps. When making two-component addition-type liquid encapsulants, problems such as excessive viscosity and poor fluidity are prone to occur, and the yield is low. Many low molecular weights will affect the benefits. [0003] Therefore, it is necessary to develop a vinyl silicone oil with lower viscosity. Contents of the invention [0004] The object of the present invention is to provide a kind of low viscosity vinyl silicone oil and preparation method thereof. [0005] The technical schem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/20C08G77/08C08G77/34C09J183/07
CPCC08G77/08C08G77/20C08G77/34C09J183/04
Inventor 闻明吴伟鹏李良
Owner 新亚制程(浙江)股份有限公司
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