Preparation method of high-solid-content star acrylate polyurethane dispersion for coating varnish

A technology of acrylic polyurethane and varnish, which is applied in the direction of coating, etc., and can solve problems such as environmental pollution

Active Publication Date: 2018-10-19
安徽匠星联创新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent aims to improve the anti-sagging and anti-foaming properties of the varnish through its raw material formula. Since xylene, butyl acetate, and ethylene glycol ethyl ether acetate are used as mixed solvents, the prepared varnish is a solvent Type varnish still has the problem of environmental pollution caused by the volatilization of organic solvents when the paint film is cured

Method used

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  • Preparation method of high-solid-content star acrylate polyurethane dispersion for coating varnish
  • Preparation method of high-solid-content star acrylate polyurethane dispersion for coating varnish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Heat 20g of hexamethylene isocyanate trimer and 1g of trimethylolpropane in a reaction kettle to 50-60°C, and react until the NCO content is 13.3% to obtain 21g of A1;

[0032] (2) React 21g A1 and 24g hydroxyethyl acrylate to NCO content at 60-80℃ <0.1%, 45gA2 is obtained;

[0033] (3) Add 45 g of propylene glycol methyl ether to 45 g of A2 to obtain 90 g of A3;

[0034] (4) Heat 90g A3 to 120-140℃, then mix the uniformly mixed acrylic acid 10g, n-butyl acrylate 50g, isobornyl acrylate 10g, methyl methacrylate 15g and initiator dicumyl peroxide 3g , Add dropwise to A3 at a constant speed within 3h, keep for 1h after dripping, to obtain 178g A4;

[0035] (5) Cool 178g A4 to 100°C, and extract 33g propylene glycol methyl ether under a negative pressure of 0.08MPa to obtain 145g A5;

[0036] (6) Cool 145g A5 to 60°C, add 12g neutralizer dimethylethanolamine dropwise at a constant speed within 0.5h, keep the temperature and stir for 15min to obtain 167g A6;

[0037] (7) Add 54 g...

Embodiment 2

[0039] (1) Heat 25 g of hexamethylene isocyanate trimer and 1.1 g of trimethylolpropane in a reaction kettle to 50-60° C., and react until the NCO content is 16.5% to obtain 26.1 g of A1;

[0040] (2) React 21g A1 with 28g hydroxyethyl acrylate to NCO content at 60-80℃ <0.1% to obtain 54.1gA2;

[0041] (3) Add 45 g of propylene glycol butyl ether to 54.1 g of A2 to obtain 99.1 g of A3;

[0042] (4) Heat 99.1g A3 to 120-140℃, and then mix the uniformly mixed 10g acrylic acid, 40g n-butyl acrylate, 10g isobornyl acrylate, 20g methyl methacrylate and initiator tert-butyl peroxide 2.4g, added dropwise to A3 at a constant rate within 3h, keep it for 1h after dripping, to obtain 181.5g A4;

[0043] (5) Cool 181.5g A4 to 100°C, and extract 32.5g propylene glycol butyl ether under a negative pressure of 0.08MPa to obtain 149g A5;

[0044] (6) Cool 149g of A5 to 60°C, add 12g of neutralizing agent dimethylethanolamine dropwise at a constant speed within 0.5h, keep the temperature and stir for 1...

Embodiment 3

[0047] (1) Heat 25 g of hexamethylene isocyanate trimer and 1.1 g of trimethylolpropane in a reaction kettle to 50-60° C., and react until the NCO content is 16.5% to obtain 26.1 g of A1;

[0048] (2) 21g A1 and 30g hydroxypropyl acrylate are reacted to NCO content at 60-80℃ <0.1% to obtain 56.1gA2;

[0049] (3) Add 45 g of propylene glycol butyl ether to 56.1 g of A2 to obtain 101.1 g of A3;

[0050] (4) Heat 101.1g A3 to 120-140℃, and then mix uniformly 9g acrylic acid, 40g n-butyl acrylate, 9g isobornyl acrylate, 20g methyl methacrylate and initiator tert-butyl peroxide. 2.4g, added dropwise to A3 at a constant rate within 3h, keep it for 1h after dripping, to obtain 181.5g A4;

[0051] (5) Cool 181.5g A4 to 100°C, and extract 32.5g propylene glycol butyl ether under a negative pressure of 0.08MPa to obtain 149g A5;

[0052] (6) Cool 149g of A5 to 60°C, add 12g of neutralizing agent dimethylethanolamine dropwise at a constant speed within 0.5h, keep the temperature and stir for 15mi...

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Abstract

The invention discloses a preparation method of a high-solid-content star acrylate polyurethane dispersion for coating varnish, and relates to the technical field of coating varnish. The preparation method comprises the steps of synthesizing an NCO group-containing star core A1 by using an isocyanate trimer and trimethylolpropane; synthesizing a double bond-containing star core A2 by reaction between the star core A1 and a hydroxyl-terminated acrylic monomer; adding an organic solvent into the star core A2 for diluting to obtain an A3; dropwise adding an acrylic monomer, a functional acrylic monomer and an initiator into the A3 to synthesize star acrylate polyurethane A4; then removing the solvent; neutralizing and adding deionized water for high speed dispersing, so as to prepare the high-solid-content star acrylate polyurethane dispersion. The acrylate polyurethane dispersion prepared by the method provided by the invention can form a high weather-proof coating film with high fullness and glossiness of 98 or more by matching with amino resin; the solvent content is less than 5%, the solid content is higher than 60%, and the effects of environment protection and no pollution are realized.

Description

Technical field: [0001] The invention relates to the technical field of varnishes, in particular to a method for preparing a high-solid content star acrylic polyurethane dispersion for varnishes. Background technique: [0002] The existing varnishes are mainly oil-based acrylic resins, and the disadvantage is that the solvent content is between 50-70%, and the advantages are plump paint film, high gloss and good weather resistance. The water-based varnishes are mainly water-soluble acrylic and polyester. The disadvantage of water-soluble acrylic is that the solvent content is between 20-40%, the fullness is poor, and the advantages are good weather resistance and high gloss. The disadvantage of water-soluble polyester is that the solvent content is between 10-30%, the weather resistance is poor, and the advantage is fullness and high gloss. [0003] Patent CN201110100557.9 discloses an anti-sagging and anti-blistering varnish for automobile coating and its preparation method and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/06C08F220/14C08F220/18C08F212/08C08G18/32C08G18/67C09D151/08
CPCC09D151/08C08F283/008C08G18/3206C08G18/672C08F220/1808C08F220/1804
Inventor 刘明星周静静梁亚平孙学武
Owner 安徽匠星联创新材料科技有限公司
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