Silica sol, preparation method of silica sol, acrylic resin and acrylic dual-component polyurethane coating

A silica sol, tetraethyl orthosilicate technology, applied in polyurea/polyurethane coatings, chemical instruments and methods, coatings, etc., can solve the problem of difficult choice of comonomers, low temperature resistance of acrylic resin, poor water resistance and air permeability, Affect the stable progress of emulsion polymerization and other problems, and achieve the effects of excellent comprehensive physical and mechanical properties, improved coating performance, and outstanding super weather resistance.

Active Publication Date: 2017-05-31
SHANGHAI ZHENGOU IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the research status at home and abroad, there are still some problems: as due to the existence of water in the emulsion polymerization, the hydrolysis and condensation reaction of the alkoxy group occurs, which seriously affects the stable progress of the emulsion polymerization; There is a huge gap in molecular structure and polarity, different degrees of phase separation will occur due to compatibility problems, and it is difficult to choose comonomers, etc.
However, due to the poor temperature resistance, water resistance and air permeability of acrylic resin, its application is limited.

Method used

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  • Silica sol, preparation method of silica sol, acrylic resin and acrylic dual-component polyurethane coating
  • Silica sol, preparation method of silica sol, acrylic resin and acrylic dual-component polyurethane coating

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 182g of tetraethyl orthosilicate (TEOS) and 146g of absolute ethanol into a three-necked flask, oil bath at 35°C, stir evenly, then add a drop of hydrochloric acid, react for 1 hour, continue to add 73g of absolute ethanol, and then dropwise add 218g of silane Coupling agent (γ-(methacryloyloxy)propyltrimethoxysilane, KH570), dropwise for 35 minutes, after dropping, raise the temperature to 50°C for reflux reaction for 3 hours, and finally age at room temperature for 3 days to obtain silica sol .

Embodiment 2

[0024] Add 189g of tetraethyl orthosilicate (TEOS) and 180g of absolute ethanol into a three-necked flask, put in an oil bath at 40°C, stir evenly, then add a drop of hydrochloric acid, react for 1.5h, then continue to add 90g of absolute ethanol, and then dropwise add 240g Silane coupling agent (γ-(methacryloyloxy)propyltrimethoxysilane, KH570), dropwise for 35 minutes, after dropping, raise the temperature to 60°C for reflux reaction for 3.5 hours, and finally age at room temperature for 4 days to obtain Silica sol.

Embodiment 3

[0026] Add 218g of tetraethyl orthosilicate (TEOS) and 170g of absolute ethanol into a three-necked flask, put an oil bath at 35°C, stir evenly, then add a drop of hydrochloric acid, react for 1 hour, continue to add 85g of absolute ethanol, and then dropwise add 290g of silane Coupling agent (γ-(methacryloyloxy)propyltrimethoxysilane, KH570), dropwise for 40 minutes, after dropping, raise the temperature to 55°C for reflux reaction for 4 hours, and finally age at room temperature for 3.5 days to obtain silica sol .

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Abstract

The invention provides silica sol, a preparation method of the silica sol, acrylic resin and acrylic dual-component polyurethane coating and is used for solving the problem that existing acrylic dual-component polyurethane coating has poor performance of hardness, wear resistance, impact resistance, adhesion and the like. The preparation method of the silica sol provided by the invention comprises the following steps: the step 1) reacting tetraethoxysilane with absolute ethyl alcohol under acid condition to form intermediate reaction solution; the step 2) adding the absolution ethyl alcohol and a silane coupling agent (gamma-(methylacryloyl oxy) propyl trimethoxy silane) into the intermediate reaction solution to react and aging to obtain the silica sol. Furthermore, the silica sol can be applied to modify the acrylic resin, the modified acrylic resin can be applied to the acrylic dual-component polyurethane coating to obtain the acrylic dual-component polyurethane coating containing silica sol modified acrylic resin, and the obtained acrylic dual-component polyurethane coating has excellent performance of hardness, wear resistance, impact resistance and adhesion.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a silica sol and a preparation method thereof, an acrylic resin, and an acrylic two-component polyurethane coating. Background technique [0002] Acrylic resin is a high-molecular material with strong adhesion and high film-forming properties. Strong adhesion, with the characteristics of self-drying at room temperature, and rich sources of raw materials, easy to implement production. However, the structure of acrylic resin is generally a chain-like linear structure, which is extremely sensitive to temperature, and will gradually become soft and sticky as the temperature rises; in addition, the film formed by acrylic resin is not resistant to the action of organic solvents, and the film will be affected by the action of organic solvents. Swelling will occur, causing the coating to fall off. The main purpose of the modification of acrylic resin is to overcome the shor...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/06C08F220/28C08F220/18C08F212/08C08K3/36C09D175/04C09D7/12C08G18/62C01B33/145
CPCC01B33/145C08F220/14C08G18/6229C08K3/04C08K3/22C08K3/30C08K3/34C08K3/36C08K3/40C09D7/61C09D175/04C08F220/06C08F220/281C08F220/18C08F212/08C08F220/1804
Inventor 张韧宗正新赵建芳朱正斌许韬刘庆陈凯
Owner SHANGHAI ZHENGOU IND
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