Reactive type inhibitor and preparation method thereof, silicone rubber composition, silicone rubber and preparation method thereof

A silicone rubber composition and inhibitor technology, applied in the field of silicone rubber, can solve the problems of long time for noble metal catalysts to reactivate, pollute silicone rubber products, and easy phase separation, so as to promote rapid progress and enhance compatibility , the effect of not easy phase separation

Inactive Publication Date: 2021-06-11
INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, traditional inhibitors such as acetylenic alcohol compounds, maleic acid esters or fumaric acid esters have the following disadvantages: first, they are not sensitive to temperature, and it takes a long time for the noble metal catalyst to reactivate after heating; The solubility in the composition is poor, and phase separation is prone to occur, which affects the use effect; third, after the silicone rubber composition is cross-linked to form a silicone rubber product, it is easy to migrate out of the silicone rubber product and contaminate the silicone rubber product

Method used

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  • Reactive type inhibitor and preparation method thereof, silicone rubber composition, silicone rubber and preparation method thereof
  • Reactive type inhibitor and preparation method thereof, silicone rubber composition, silicone rubber and preparation method thereof
  • Reactive type inhibitor and preparation method thereof, silicone rubber composition, silicone rubber and preparation method thereof

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preparation example Construction

[0032] The present invention also provides a preparation method for the above-mentioned reactive inhibitor, comprising the following steps:

[0033] (1) Provide hydroxypolysiloxane containing olefin group;

[0034] (2) Mix the olefin-containing hydroxypolysiloxane with the first raw material or the second raw material, and react to obtain a reaction-type inhibitor; wherein, the first raw material includes maleic acid chloride and fumaryl chloride At least one of, the second raw material includes at least one of maleic anhydride, maleic acid, and fumaric acid.

[0035] In step (1), the olefin-containing hydroxypolysiloxane is preferably a vinyl-containing hydroxypolysiloxane, more preferably a vinyl-containing dihydroxypolysiloxane.

[0036] In step (2), when the olefin-containing hydroxypolysiloxane is mixed with the first raw material, the molar ratio of the olefin-containing hydroxypolysiloxane to the first raw material is 0.9: 1-2:1.

[0037] Since the hydroxypolysiloxan...

Embodiment 1

[0077] Dissolve 100g of hydroxyl-terminated polysiloxane containing vinyl groups in the side chain (hydroxyl content 2.5wt%, vinyl content 3.1%, viscosity 70cp) in 500mL of toluene, add 11g of pyridine to stir, and place in a 2L three-necked glass flask , slowly added 11.3 g of fumaryl chloride dropwise, and the dropwise addition was completed in 30 minutes, then slowly raised the temperature to 50° C., and stirred overnight. The precipitate was removed by filtration. The filtrate was washed three times with 200mL and 5% aqueous sodium carbonate solution, three times with 200mL water, and three times with 200mL saturated NaCl solution, dried by adding anhydrous magnesium sulfate, filtered, and the solvent was distilled off to obtain a reaction-type inhibitor with the following structural formula: Agent, reactive inhibitor viscosity is 4600cp.

[0078]

[0079]100 parts by weight of vinylpolysiloxane with a viscosity of 335Pa·s at 25°C, 10 parts by weight of organohydrogenp...

Embodiment 2

[0082] 100g of vinyl dimethylol polysiloxane (hydroxyl content 0.5wt%, vinyl content 1.6wt%, viscosity 80cp) was dissolved in 500mL toluene, and 1.44g maleic anhydride and 0.5g p-toluenesulfonic acid were added as The catalyst was placed in a 2L three-necked glass flask, heated to reflux of toluene, and the water generated by the reaction was removed through a water separator, and refluxed until no more water was generated. Wash with 200mL, 5% sodium carbonate aqueous solution three times, 200mL water three times, 200mL saturated NaCl solution, add anhydrous magnesium sulfate to dry, filter, distill off the solvent to obtain the reaction type inhibitor shown in the following formula , Reactive inhibitor viscosity is 6700cp.

[0083]

[0084] 100 parts by weight of vinylpolysiloxane with a viscosity of 740 Pa·s at 25°C, 20 parts by weight of organohydrogenpolysiloxane with a viscosity of 0.5mPa·s at 25°C, and 0.12 parts by weight of platinum are 1000ppm of castel platinum c...

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Abstract

The invention relates to a reaction type inhibitor and a preparation method thereof, the structural formula of the reaction type inhibitor is shown in the following formula (1), R1 comprises at least one of alkane, cycloalkane and aryl, R2 is alkylene, R3 is -(CH2) n-, n is an integer of 0-4, R4 is one of -(CH2)n-, x and y are integers, and the sum of x and y is less than or equal to 20000. The invention also relates to a silicone rubber composition, silicone rubber and a preparation method thereof. The reactive inhibitor is mainly used in the silicone rubber composition, so that the activity of a noble metal catalyst is reduced, the controllability of hydrosilylation reaction is enhanced, and the operable time of the silicone rubber composition is prolonged; and in addition, the reactive inhibitor can also form a uniform molecular cross-linked network structure with the silicone rubber to become a part of the silicone rubber, so that the reactive inhibitor cannot migrate out of the silicone rubber to pollute a silicone rubber product.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a reaction inhibitor and a preparation method thereof, a silicone rubber composition, silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber composition (also known as liquid silicone rubber) is generally prepared into silicone rubber by hydrosilylation under the action of platinum, rhodium, palladium and other precious metal catalysts. However, noble metal catalysts have strong activity and can catalyze the hydrosilylation reaction at room temperature, which makes the storage and use of the silicone rubber composition very inconvenient. Therefore, it is necessary to add an inhibitor to the silicone rubber composition to make it stable at room temperature, and the reaction can only occur after the temperature is raised. At present, the commonly used inhibitors in the industry mainly include acetylenic alcohol compounds, maleic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/20C08G77/38C08L83/07C08L83/05
CPCC08G77/20C08G77/38C08L83/04C08L2205/025C08L2205/03
Inventor 张成裕陆明松侯国辉苏红宏
Owner INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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