Silicone rubber composition, silicone rubber and preparation method therefor

A technology of silicone rubber composition and silicone rubber, which is applied in the field of silicone rubber, can solve the problems of poor controllability, long operation time, and increased curing time of silicone rubber composition, and achieve the effect of excellent heat resistance

Active Publication Date: 2019-05-07
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 main inhibitors commonly used in the industry often need to be added in a relatively large amount (generally 20 to 100 times that of the noble metal catalyst) to achieve a better inhibitory effect, which leads to an increase in the curing time of the silicone rubber composition, which is controllable. Poor sex
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 therefor
  • Silicone rubber composition, silicone rubber and preparation method therefor
  • Silicone rubber composition, silicone rubber and preparation method therefor

Examples

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preparation example Construction

[0029] Specifically, the preparation method of the inhibitor comprises the following steps:

[0030] (1) Provide dihydroxyalkyl polysiloxane;

[0031] (2) Mix the dihydroxyalkyl polysiloxane with raw material A or raw material B, and react to obtain an inhibitor; wherein, the raw material A includes one of maleic acid chloride and fumaryl chloride, and the The raw material B includes one of maleic anhydride, maleic acid and fumaric acid.

[0032] In step (2), when the dihydroxyalkyl polysiloxane is mixed with the raw material A, the molar ratio of the dihydroxyalkyl polysiloxane to the raw material A is 0.9:1 to 2: 1.

[0033] Since the dihydroxyalkyl polysiloxane reacts with the raw material A to generate hydrochloric acid, during the reaction process between the dihydroxyalkyl polysiloxane and the raw material A, triethylamine, pyridine, Acid-binding agents such as sodium hydroxide. The acid-binding agent can react with hydrochloric acid to improve the reaction efficienc...

Embodiment 1

[0078] Dissolve 100g (73.5mmol) dihydroxyethyl polydimethylsiloxane (hydroxyl silicone oil, hydroxyl content 2.5wt%, viscosity 50cp~120cp) in 500mL toluene, add 11g pyridine and stir, place in a 2L three-mouth glass Into the flask, 11.3g (73.5mmol) of fumaryl chloride was slowly added dropwise, and the dropwise addition was completed in 30 minutes, then the temperature was slowly raised to 50°C, and stirred 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 three times with 200 mL saturated NaCl solution, dried by adding anhydrous magnesium sulfate, filtered, and distilled to remove the solvent to obtain the inhibitor. The inhibitor is a fumaric acid ester with polysiloxane long-chain structure, the viscosity is 5000cp, and the structural formula is as follows:

[0079]

[0080] 100 parts by weight of vinyl-containing polysiloxane with a viscosity...

Embodiment 2

[0083] Dissolve 100g (14.7mmol) dimethylolpolymethylethylsiloxane (hydroxyl silicone oil, hydroxyl content 0.5wt%) in 500mL toluene, add 1.44g (14.7mmol) maleic anhydride, 0.5mg p-toluene Sulfonic acid is used as a catalyst, placed in a 2L three-necked glass flask, heated to reflux of toluene, and the water generated by the reaction is removed through a water separator, and refluxed until no more water is 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, and distill off the solvent to obtain the inhibitor, which is polysiloxane Maleic acid ester with long chain structure, viscosity 12000cp. The structural formula is as follows:

[0084]

[0085]100 parts by weight of vinyl-containing polysiloxane 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, 0.12 parts of polysiloxa...

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Abstract

The invention relates to a silicone rubber composition, silicone rubber and a preparation method therefor. The silicone rubber composition comprises crude rubber, a cross-linker, a noble metal catalyst and an inhibitor, wherein the inhibitor has a structural formula represented by a formula (1) shown in the description, wherein both R1 and R2 are one of methyl, ethyl, phenyl and -CH2CH2CF3, R3 is-(CH2)n-, n is an integer of 1 to 4, R4 is either a formula shown in the description or a formula shown in the description, both x and y are integers, and x and y meet a relationship: x+y= 1 to 20,000. The inhibitor disclosed by the invention can better lower the activity of the noble metal catalyst at room temperature, is sensitive to temperatures and can restore the activity of the noble metal catalyst after being heated, the silicone rubber composition is rapidly catalyzed to be cured into the silicone rubber, and the storage stability and process adaptability of the silicone rubber composition are guaranteed. Meanwhile, the inhibitor contains a polysiloxane long-chain group and has good compatibility with the silicone rubber composition, and thus, the inhibitor cannot be migrated fromthe silicone rubber to pollute products.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a silicone rubber composition, silicone rubber and a preparation method thereof. Background technique [0002] Existing silicone rubber compositions (also known as liquid silicone rubber) include raw rubber, precious metal catalysts and crosslinking 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 not conducive 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 to reduce the rate of crosslinking of raw rubber in the silicone rubber composition into silicone rubber under certain condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K3/36C08J3/24C08G77/38
Inventor 张成裕苏红宏
Owner INST OF FLEXIBLE ELECTRONICS TECH OF THU ZHEJIANG
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