Silicone rubber composition, silicone rubber and preparation method of silicone rubber

A silicone rubber composition and raw rubber technology, applied in the field of silicone rubber, can solve the problems of increased curing time, long operating time, and poor controllability of silicone rubber compositions

Active Publication Date: 2019-05-03
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] At present, the inhibitors commonly used in the industry often need to be added in a relatively large amount to achieve a better inhibitory effect, which leads to an increase in the curing time of the silicone rubber composition and poor controllability
Moreover, when some temperature-sensitive device packages are used, such as when the curing temperature is required to be lower than 100°C, or even lower than 80°C, the operating time is longer

Method used

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  • Silicone rubber composition, silicone rubber and preparation method of silicone rubber
  • Silicone rubber composition, silicone rubber and preparation method of silicone rubber
  • Silicone rubber composition, silicone rubber and preparation method of silicone rubber

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preparation example Construction

[0069] The present invention also provides a preparation method of silicone rubber, comprising the following steps:

[0070] (1) provide the above-mentioned silicone rubber composition;

[0071] (2) heating the silicone rubber composition, under the catalysis of the noble metal catalyst, the raw rubber and the crosslinking agent undergo a curing reaction to obtain silicone rubber.

[0072] Specifically, the heating temperature in step (2) is greater than or equal to 50°C, preferably, the heating temperature is 50°C to 150°C, more preferably 60°C to 150°C.

[0073] The present invention also provides a silicone rubber obtained by the above preparation method, wherein the silicone rubber has a network structure.

[0074] The silicone rubber of the present invention has properties such as heat resistance, cold resistance, dielectric property, ozone resistance and atmospheric aging resistance, and can be used for a long time at -60°C to 250°C. Therefore, it can be widely used in ...

Embodiment 1

[0077] Preparation of long-chain branched fumarate (taking di-n-octyl fumarate as an example).

[0078] Dissolve 260g of n-octanol in 1000g of cyclohexane, add 110g of sodium carbonate and stir, place in a 2L three-necked glass flask, slowly add 160g of fumaric acid chloride dropwise, complete the dropwise addition in 30 minutes, slowly heat up to 50°C, and stir overnight . The precipitate was removed by filtration. The filtrate was washed three times with 200 mL and 5% aqueous sodium carbonate solution, three times with 200 mL water, and 200 mL saturated NaCl solution, dried over anhydrous magnesium sulfate, filtered, and the solvent was distilled off to obtain a crude product. Under reduced pressure distillation, 310 g of di-n-octyl fumarate was obtained, and the yield was 90%.

[0079] By this method, the corresponding long-chain branched fumaric acid diesters can be obtained by reacting different alcohols with fumaric acid chlorides.

[0080] For the reaction of fatty a...

Embodiment 2

[0082] Preparation of cyclic fumarate (take cyclic dodecyl fumarate as an example).

[0083]Dissolve 20 g of dodecyl glycol in 500 mL of cyclohexane, and dissolve 15.3 g of fumaric acid chloride in 500 mL of cyclohexane, respectively, place them in two 1000 mL round-bottomed flasks, mix 12 g of anhydrous sodium carbonate and 500 mL of cyclohexane. Placed in a 2L three-necked flask. At the same time, dodecyl glycol and fumaric acid chloride cyclohexane solution were added dropwise to the 2L round-bottomed flask, and the dropping rate was controlled at about 1 mL / min, and the dropping was completed in 8 hours. Continue stirring overnight. The precipitate was removed by filtration. The filtrate was washed three times with 200 mL and 5% aqueous sodium carbonate solution, three times with 200 mL water, and 200 mL saturated NaCl solution, dried over anhydrous magnesium sulfate, filtered, and the solvent was distilled off to obtain a crude product. Under reduced pressure distillat...

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Abstract

The present invention relates to a silicone rubber composition, silicone rubber and a preparation method of the silicone rubber. The silicone rubber composition includes raw rubber, a crosslinking agent, a noble metal catalyst and an inhibitor; and the inhibitor includes at least one selected from the group consisting of long-chain branched fumarate having a structural formula represented by a formula (1) shown in the description, cyclic fumarate having a structural formula represented by a formula (2) shown in the description, polyfumarate having a structural formula represented by a formula(3) shown in the description, a long-chain branched maleate having a structural formula represented by a formula (4) shown in the description, cyclic maleate having a structural formula represented bya formula (5) shown in the description, and polymaleate having a structural formula represented by a formula (6) shown in the description, wherein R1 and R2 are separately one selected from an aliphatic alkane group or an aryl group having C8 or more, and R3 and R4 are separately one selected from an aliphatic alkane group having C2 or more. The silicone rubber composition provided by the invention has good storage stability at room temperature and is sensitive to temperature, and can be better applied to the field of packaging of temperature-sensitive electronic devices.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to an inhibitor, a preparation method thereof, and related applications. Background technique [0002] Existing silicone rubber compositions (also known as liquid silicone rubbers) include raw rubber, precious metal catalysts, and cross-linking agents. Raw rubber is generally prepared into silicone rubber by hydrosilation reaction under the action of platinum, rhodium, palladium and other precious metal catalysts. However, noble metal catalysts have strong activity and can catalyze raw rubber to obtain finished silicone rubber at room temperature. This is detrimental to the storage and use of the silicone rubber composition. Therefore, it is necessary to add an inhibitor to the silicone rubber composition. The function of the inhibitor is: inhibiting at room temperature and reducing the activity of the precious metal catalyst; under conditions such as heating or light, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08L67/06C08K5/11C08K5/156
Inventor 张成裕苏红宏
Owner INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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