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A kind of high temperature resistant and high compatibility trapezoidal silicone resin and its preparation method and application

A compatible and high-temperature-resistant technology, applied in adhesives and other directions, can solve the problems of poor controllability of molecular structure and achieve good reaction specificity

Active Publication Date: 2022-07-22
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent uses the T chain link and the D chain link bridging base to form an intermediate through one-step condensation reaction. In the case of the main chain polycondensation reaction, the controllability of the molecular structure is poor
Patent CN 108003348 A discloses a siloxane bridging ladder polysiloxane. Although the types of bridging groups are increased, the siloxane bridging ladder polysiloxane homopolymer used in its co-condensation still has the above-mentioned problems

Method used

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  • A kind of high temperature resistant and high compatibility trapezoidal silicone resin and its preparation method and application
  • A kind of high temperature resistant and high compatibility trapezoidal silicone resin and its preparation method and application
  • A kind of high temperature resistant and high compatibility trapezoidal silicone resin and its preparation method and application

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Embodiment 1

[0045] The preparation method of a high temperature resistant and high compatibility trapezoidal silicone resin of the present embodiment, the specific preparation steps are as follows:

[0046] (1) Preparation of Methylpolysiloxane Ladder Prepolymer:

[0047] In a four-necked flask equipped with a constant-pressure dropping funnel, a reflux condenser, a thermometer and an electric mixer, add vinyl-terminated tetramethyldisiloxane (vinyl double-capped head, a=0, M n =186)) and isopropanol solvent, stirring and dissolving uniformly, heating and warming up to 80 ℃ under nitrogen protection, adding the chloroplatinic acid catalyst of calculated amount to the four-necked flask, making the platinum content in the system 25ppm, opening the constant pressure subsequently The dropping funnel slowly added methyldimethoxysilane (the molar ratio of vinyl to hydrogen was 1:1.1) into the four-necked flask, and the temperature was controlled to be 80°C to carry out reflux reaction for 2h. ...

Embodiment 2

[0054] The preparation method of a high temperature resistant and high compatibility trapezoidal silicone resin of the present embodiment, the specific preparation steps are as follows:

[0055] (1) Preparation of Methylpolysiloxane Ladder Prepolymer:

[0056] In a four-necked flask equipped with a constant-pressure dropping funnel, a reflux condenser, a thermometer and an electric mixer, add vinyl-terminated polydimethylsiloxane (a=8, average molecular weight M n 800) and ethylene glycol monoethyl ether solvent, stir and dissolve evenly, heat up to 80°C under nitrogen protection, add the calculated amount of 1,3-divinyl-1,1,3,3-tetramethyldisiloxane Alkyl platinum (0) catalyst is placed in a four-necked flask, so that the platinum content in the system is 10ppm, then the constant pressure dropping funnel is opened and methyldimethoxysilane (by the mol ratio of vinyl and hydrogen is 1:1.05) ) was slowly added to the four-necked flask, and the control temperature was 100°C to ...

Embodiment 3

[0062] The preparation method of a high temperature resistant and high compatibility trapezoidal silicone resin of the present embodiment, the specific preparation steps are as follows:

[0063] (1) Preparation of Methylpolysiloxane Ladder Prepolymer:

[0064] In a four-necked flask equipped with a constant-pressure dropping funnel, a reflux condenser, a thermometer and an electric mixer, add vinyl-terminated polydimethylsiloxane (a=15, average molecular weight M n 1300), and a mixed solvent of isopropanol and ethylene glycol monoethyl ether, stir and dissolve evenly, heat up to 80°C under nitrogen protection, add the calculated amount of 1,3-divinyl-1,1,3,3- The tetramethyldisiloxane platinum (0) catalyst was placed in a four-necked bottle, so that the platinum content in the system was 50 ppm, then the constant pressure dropping funnel was opened and methyldimethoxysilane (by moles of vinyl and hydrogen) was added. The ratio is 1:1.1 feeding) slowly added to the four-necked...

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Abstract

The invention belongs to the technical field of silicone rubber, and discloses a high-temperature-resistant and high-compatibility trapezoidal silicone resin and a preparation method and application thereof. The vinyl-terminated polydimethylsiloxane and vinyl-terminated polyphenylmethylsiloxane and methyldimethoxysilane are respectively prepared by hydrosilylation to obtain methyl polysiloxane. The laddered prepolymer and the phenyl polysiloxane laddered prepolymer are then subjected to a co-hydrolysis reaction under the condition of an acid solution, and after the reaction is completed, trimethylchlorosilane is added to cap the terminal to obtain a high temperature resistant and high compatibility ladder silicone resin. The preparation method of the invention has good reaction specificity and high degree of structural control. The obtained trapezoidal silicone resin can be applied to the silicone pressure-sensitive adhesive and can simultaneously achieve obvious effects of compatibilization, enhancement, high temperature resistance and high transparency.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a high-temperature-resistant and high-compatibility trapezoidal silicone resin and a preparation method and application thereof. Background technique [0002] Ladder polysiloxane (R-LPS) is a polysiloxane with double-chain or multi-chain and ladder-like molecular structure. Compared with the corresponding single-chain polysiloxane polymer, it has more excellent properties. High temperature resistance, radiation resistance, weather resistance, high strength, high air tightness, etc. [0003] The currently known ladder-type silicone polymers can be divided into three categories according to the types of ladder members: oxygen-bridged ladder-type polysilsesquioxane, organo-bridged ladder-type polysiloxane, and siloxane-bridged ladder-type polysiloxane alkyl. Generally, oxygen-bridged ladder polysilsesquioxane exhibits more inorganic properties of polysiloxane, such as ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/44C09J183/04
CPCC08G77/44C09J183/04
Inventor 李泽勇柳晨醒姚坤满何海郑贵明曾祥雷
Owner GUANGZHOU TINCI MATERIALS TECH
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