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Transparency-enhanced condensed type room-temperature vulcanized silicone rubber as well as preparation method and application thereof

A room temperature vulcanization and condensation type technology, which is applied in the field of transparency enhanced condensation type room temperature vulcanization silicone rubber and its preparation, can solve the problems of poor storage stability, difficulty in accurately controlling the content of silanol, polycondensation of resin molecules, etc., to achieve improved mechanical properties, good Enhanced effect, effect of good storage stability

Inactive Publication Date: 2014-12-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this MQ resin with residual silanol has two defects. One is that the content of silanol is difficult to control accurately; the other is that there is a possibility of further polycondensation between resin molecules, resulting in poor storage stability.

Method used

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  • Transparency-enhanced condensed type room-temperature vulcanized silicone rubber as well as preparation method and application thereof
  • Transparency-enhanced condensed type room-temperature vulcanized silicone rubber as well as preparation method and application thereof
  • Transparency-enhanced condensed type room-temperature vulcanized silicone rubber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A kind of transparency enhancement condensation type room temperature vulcanization silicone rubber, its preparation method comprises the steps:

[0054] (1) Preparation of methoxy MQ resin: Add 200 g of vinyl MQ resin (vinyl content is 1.04%), 9.6 g of trimethoxysilane, 30 g of toluene, and 0.06 g of platinum catalyst into a 500 ml three-necked flask respectively, and stir under magnetic force Heat up to 80°C, continue to stir and react for 4 hours to obtain the mixture; distill the resulting mixture at 90°C for 30min under reduced pressure to obtain a colorless transparent liquid, which is methoxy MQ resin (methoxyl content 2.03%, number average The molecular weight Mn is 1185.7);

[0055] (2) Weigh 20g of the methoxy MQ resin prepared above, add 80g of α,ω-dihydroxypolydimethylsiloxane (molar mass: 1000g / mol) into a 150ml flask, stir for 10min, and then Remove the toluene by rotary evaporation at low temperature; then add 0.5 g of dibutyltin dilaurate to the system,...

Embodiment 2

[0057] A kind of transparency enhancement condensation type room temperature vulcanization silicone rubber, its preparation method comprises the steps:

[0058] (1) Preparation of methoxy MQ resin: Add 200 g of vinyl MQ resin (vinyl content is 1.04%), 9.6 g of trimethoxysilane, 30 g of toluene, and 0.06 g of platinum catalyst into a 500 ml three-necked flask respectively, and stir under magnetic force Heat up to 80°C, continue to stir and react for 4 hours to obtain the mixture; distill the resulting mixture at 90°C for 30min under reduced pressure to obtain a colorless transparent liquid, which is methoxy MQ resin (methoxyl content 2.03%, number average The molecular weight Mn is 1185.7).

[0059] (2) Weigh 40g of the above-prepared methoxy MQ resin, add 60g of α,ω-dihydroxy polydimethylsiloxane (molar mass: 2000g / mol) into a 150ml flask, stir for 10min, and then refrigerate at 110°C Remove the toluene by rotary evaporation at low temperature; then add 1.5 g of dibutyltin di...

Embodiment 3

[0061] A kind of transparency enhancement condensation type room temperature vulcanization silicone rubber, its preparation method comprises the steps:

[0062] (1) Preparation of methoxy MQ resin: Add 200 g of vinyl MQ resin (vinyl content is 1.04%), 9.6 g of trimethoxysilane, 30 g of toluene, and 0.06 g of platinum catalyst into a 500 ml three-necked flask respectively, and stir under magnetic force Heat up to 80°C, continue to stir and react for 4 hours to obtain the mixture; distill the resulting mixture at 90°C for 30min under reduced pressure to obtain a colorless transparent liquid, which is methoxy MQ resin (methoxyl content 2.03%, number average The molecular weight Mn is 1185.7);

[0063] (2) Weigh 10g of the above-prepared methoxy MQ resin, add 90g of α,ω-dihydroxypolydimethylsiloxane (molar mass: 2000g / mol) into a 150ml flask, stir for 10min, and then Remove the toluene by rotary evaporation at low temperature; then add 1.5 g of dibutyltin dilaurate to the system,...

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Abstract

The invention belongs to the field of room temperature vulcanized silicone rubbers and discloses a transparency-enhanced condensed type room-temperature vulcanized silicone rubber as well as a preparation method and application thereof. The transparency-enhanced condensed type room-temperature vulcanized silicone rubber comprises the following components in parts by weight: 50-90 parts of alpha,omega-dyhydroxyl polydimethylsiloxane, 10-50 parts of methoxyl MQ resin and 0.2-1 part of catalyst. A preparation method for the transparency-enhanced condensed type room-temperature vulcanized silicone rubber comprises the following steps: mixing and uniformly mixing the alpha,omega-dyhydroxyl polydimethylsiloxane with the methoxyl MQ resin, then adding an appropriate amount of catalyst, further uniformly stirring, and placing the mixture into a vacuum drying oven to remove air bubbles; placing the transparent liquid at a room temperature for curing, wherein the obtained rubber strips are transparency-enhanced condensed type room-temperature vulcanized silicone rubbers. The transparency-enhanced condensed type room-temperature vulcanized silicone rubber disclosed by the invention has very good construction mobility, transparency and strength, and can be used for electronic component encapsulating, road gap sealing, glass adhesive antifouling paint, and the like.

Description

technical field [0001] The invention belongs to the field of room temperature vulcanized silicone rubber, and in particular relates to a transparency-enhancing condensation type room temperature vulcanized silicone rubber, a preparation method and application thereof. Background technique [0002] Condensed room temperature vulcanized silicone rubber is often used for potting of electronic and electrical components operating in high temperature, high pressure or insulating environments because of its good heat resistance, cold resistance, weather resistance, hydrophobicity and electrical insulation. , bonding, fixing or coating protection; sealing of gaps in buildings, roads and airport runways; bonding and sealing of glass and anti-pollution flashover coatings, etc. However, pure condensation-type room temperature vulcanization silicone rubber has small intermolecular forces, low tensile strength, and poor mechanical properties, which are difficult to meet the requirements ...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G77/14
Inventor 姜宏伟赵念林俊辉
Owner SOUTH CHINA UNIV OF TECH
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