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Polyether modified organosilicon coating leveling agent and preparation method thereof

A technology of silicone leveling agent and silicone coating, applied in the direction of coating, etc., can solve problems such as poor leveling, difference in surface tension gradient, and different volatilization speed

Pending Publication Date: 2022-04-05
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the actual construction process of coatings, due to poor leveling, brush marks appear when brushing, roller marks appear when coating and orange peel appears when spraying, and shrinkage cavities, pinholes and sags often appear during drying. These defects The production reduces the decorative and protective function of the coating
During the curing process of most coatings, the surface tension gradient is different due to factors such as the different volatilization speeds of the coating film surface and internal solvents, insoluble colloidal particles in the coating, and pollutants in the coating environment, which eventually lead to surface defects of the coating film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1. Preparation of polyether:

[0013] Add 2 mass parts of allyl alcohol and 0.1 part of self-made catalyst in the autoclave, nitrogen replacement three times, control the pressure in the kettle not to exceed 1M Pa and control the temperature in the kettle at 150-160 °C, respectively feed 15 parts of ethylene oxide and 20 parts of propylene oxide, neutralized with acetic acid after the reaction, decolorized with hydrogen peroxide and vacuum dehydrated to obtain a colorless viscous liquid, which is the finished product of allyl alcohol polyether.

[0014] 2. Preparation of polyether modified silicone:

[0015] Add 45 parts of toluene, 5 parts of hydrogen-containing silicone oil and 1 part of auxiliary materials into the reaction kettle, and then add 1 part of 1% chloroplatinic acid-isopropanol solution under stirring at room temperature for 1 hour, then add 1 part of 1% chloroplatinic acid-isopropanol solution, raise the temperature to 60 ° C and maintain the temperature ...

Embodiment 2

[0017] 1. Preparation of polyether:

[0018] Add 2 mass parts of allyl alcohol and 0.1 part of self-made catalyst in the autoclave, nitrogen replacement three times, control the pressure in the kettle not to exceed 1M Pa and control the temperature in the kettle at 150-160 °C, respectively feed 15 parts of ethylene oxide and 30 parts of propylene oxide, after the reaction is completed, dilute alkali solution neutralization, hydrogen peroxide decolorization and vacuum dehydration can obtain a colorless viscous liquid, which is the finished polyether; use acetic anhydride to treat the hydroxyl group of the obtained allyl alcohol polyether Capped.

[0019] 2. Preparation of polyether-modified silicone (acetyl-terminated): Add 45 parts of xylene, 5 parts of hydrosilane and 1 part of auxiliary materials into the reaction kettle, and then add 1 part of 1% platinum chloride after stirring at room temperature for 1 hour. Acid-isopropanol solution, heat up to 60°C and maintain the tem...

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PUM

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Abstract

The invention relates to a preparation method of a polyether modified organic silicon coating leveling agent. The polyether modified organic silicon leveling agent has the functions of a wetting agent, a dispersing agent and a defoaming agent. The method comprises the following steps: reacting allyl alcohol with different amounts of ethylene oxide and propylene oxide under the action of a catalyst to obtain allyl alcohol polyethers with different molecular weights, wherein polyether hydroxyl can be terminated by adopting acetic anhydride; toluene or xylene is used as a solvent, polyether reacts with hydrogen-containing silicone oil under the catalysis of chloroplatinic acid, colorless and transparent polyether modified organic silicon is obtained through diatomite filter pressing after addition reaction, and the solvent does not need to be evaporated out and is directly used as a commercial flatting agent.

Description

technical field [0001] The invention relates to the field of coating additive synthesis, in particular to a polyether modified silicone coating leveling agent and a preparation method thereof. Background technique [0002] In the actual construction process of coatings, due to poor leveling, brush marks appear when brushing, roller marks appear when coating and orange peel appears when spraying, and shrinkage cavities, pinholes and sags often appear during drying. These defects The production of the paint reduces the decorative and protective functions of the paint. During the curing process of most coatings, the surface tension gradient is different due to factors such as the different volatilization rates of the surface and internal solvents of the coating film, insoluble colloidal particles in the coating, and pollutants in the coating environment, which eventually lead to surface defects of the coating film. The function of the leveling agent is to reduce the difference...

Claims

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Application Information

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IPC IPC(8): C08G77/46C09D7/47
Inventor 祁世波
Owner TIANJIN POLYTECHNIC UNIV