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Organic silicon resin conformal coating capable of being cured at room temperature and preparation method thereof

A room temperature curing, silicone technology, applied in the direction of fireproof coatings, coatings, etc., can solve the problems of large steric hindrance, affecting product performance, and large steric hindrance of phenyl silicone resin, to achieve increased toughness, simple preparation process, The effect of easy response

Active Publication Date: 2020-07-28
重庆中弗聚新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical route has the following defects: due to the existence of the benzene ring in the phenyl silicone resin, the steric hindrance of the phenyl silicone resin becomes larger, which leads to harsher reaction conditions when the phenyl silicone resin is polymerized in a linear polymer , For example, reaction conditions in CN102304323A need nitrogen (inert gas), react 5-7 hours (reaction time is long), add toluene (need solvent in addition), decompression distill out solvent (process step is long); Added Pt catalyst and Dibutyltin dilaurate (two kinds of catalysts), adding toluene (another solvent is required), vacuum delowering (long process steps)
In addition, due to the large steric hindrance of phenyl silicone resin, it is easy to cause uneven structure of the product and affect the performance of the product.

Method used

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  • Organic silicon resin conformal coating capable of being cured at room temperature and preparation method thereof
  • Organic silicon resin conformal coating capable of being cured at room temperature and preparation method thereof
  • Organic silicon resin conformal coating capable of being cured at room temperature and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of hydroxymethyl silicone resin: Put 80g of ethyl orthosilicate, 20g of methyltrimethoxysilane and 140g of toluene into the reaction kettle, add 2g of concentrated HCl+20g of distilled water dropwise at room temperature, after the addition is complete, heat up to 60 Reflux reaction at ℃ for 5 hours, heat up to 70-80℃ to distill methanol and water produced in the reaction, then raise the temperature to 110℃ and reflux for 8 hours, then cool down to 60℃ and add 3g of hexamethyldisilazane to neutralize HCl, Then heat up to 110°C and concentrate to a resin solution with a solid content of 50%, and cool down for later use;

[0040] The prepared hydroxymethyl silicone resin structure is as follows:

[0041]

[0042]Preparation of alkoxy-terminated phenyl silicone oil: mix 100g octamethylcyclotetrasiloxane with 40g octaphenylcyclotetrasiloxane, 2g 1,3-dimethoxy-1,1,3,3-tetramethyl base disiloxane, 2g of alkali glue, mixed evenly, then reacted at 150°C for 5 hou...

Embodiment 2

[0050] Preparation of hydroxymethyl silicone resin: Put 70g of ethyl orthosilicate, 10g of dimethyldimethoxysilane and 120g of xylene into the reaction kettle, add 1g of concentrated HCl+8g of distilled water dropwise at room temperature, and the addition is complete , heat up to 60°C for reflux reaction for 5 hours, heat up to 70-80°C to evaporate the methanol and water produced in the reaction, then raise the temperature to 110°C for 8 hours, then cool down to 60°C and add 3g of hexamethyldisilazane Neutralize HCl, then heat up to 110°C and concentrate to a resin solution with a solid content of 50%, cool down for later use;

[0051] Preparation of alkoxy-terminated phenyl silicone oil: mix 140g octamethylcyclotetrasiloxane with 40g octaphenylcyclotetrasiloxane, 6g 1,3-dimethoxy-1,1,3,3-tetramethyl 1.5g base disiloxane and 1.5g of alkali glue were mixed evenly, then reacted at 150°C for 5 hours, heated to 180°C for 30min, and then vacuumed at this temperature for 8 hours to ...

Embodiment 3

[0054] Preparation of hydroxymethyl silicone resin: put the mixture of 100g ethyl orthosilicate and 150g toluene into the reaction kettle, add 3g concentrated HCl+15g distilled water dropwise at room temperature, after the addition is completed, heat up to 60°C for reflux reaction for 5 hours, then heat up to Distill the methanol and water produced by the reaction at 70-80°C, then raise the temperature to 110°C and reflux for 8 hours, then cool down to 60°C and add 3g of hexamethyldisilazane to neutralize HCl, then raise the temperature to 110°C and concentrate to solid The resin liquid with a content of 50% is cooled for later use;

[0055] Preparation of alkoxy-terminated phenyl silicone oil: mix 140g octamethylcyclotetrasiloxane with 80g octaphenylcyclotetrasiloxane, 2g 1,3-dimethoxy-1,1,3,3-tetramethyl base disiloxane and 4g of alkali gel were mixed evenly, then reacted at 150°C for 5 hours, heated to 180°C for 30min, and then vacuumed at this temperature for 8 hours to ob...

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Abstract

The invention discloses an organic silicon resin conformal coating capable of being cured at room temperature and a preparation method thereof. The organic silicon resin conformal coating capable of being cured at room temperature is mainly prepared from the following raw materials: hydroxymethyl organic silicon resin, alkoxy-terminated phenyl silicone oil, a cross-linking agent and a catalyst. The organic silicon resin is modified in the invention to obtain the organic silicon resin conformal coating introduced with a bifunctional chain link, so the toughness of the silicon resin is improved;and the organic silicon resin conformal coating contains the tin catalyst, so the curing of the coating at room temperature is realized.

Description

technical field [0001] The invention relates to the field of silicone resin materials, in particular to a room-temperature-curable silicone resin conformal coating and a preparation method thereof. Background technique [0002] Silicone material is a polysiloxane composed of a unique structure of silicon-oxygen bond (-Si-O-Si-), which has the properties of both inorganic and organic materials, and has basic properties such as good weather resistance, high and low temperature resistance, and has Excellent properties such as electrical insulation, oxidation resistance stability, water repellency, corrosion resistance, non-toxic, tasteless and physiological inertness. It is not only used in special industries such as aerospace and military, but also widely used in various industries such as organic synthesis, building materials, lighting, daily chemicals, household appliances, textile finishing, automobiles, machinery manufacturing, papermaking and pharmaceutical engineering, e...

Claims

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Application Information

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IPC IPC(8): C09D183/10C09D5/18C08G77/44
CPCC08G77/44C08G77/80C09D5/18C09D183/10
Inventor 曲艳斌吴念钟成
Owner 重庆中弗聚新材料科技有限公司
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