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Preparation method of high-solid star-shaped acrylic polyurethane dispersion for varnish

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

Active Publication Date: 2020-04-24
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

AI Technical Summary

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 star-shaped acrylic polyurethane dispersion for varnish
  • Preparation method of high-solid star-shaped acrylic polyurethane dispersion for varnish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0032] (2) React 21g of A1 with 24g of hydroxyethyl acrylate at 60-80°C until the NCO content is <0.1%, to obtain 45g of A2;

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

[0034] (4) Heat 90g A3 to 120-140°C, then mix uniformly 10g of acrylic acid, 50g of n-butyl acrylate, 10g of isobornyl acrylate, 15g of methyl methacrylate and 3g of initiator dicumyl peroxide , added dropwise to A3 at a uniform speed within 3 hours, and kept warm for 1 hour after dropping to obtain 178g A4;

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

[0036] (6) Cool 145g of A5 to 60°C, add 12g of neutralizing agent dimethylethanolamine dropwise at a constant speed within 0.5h, keep stirring for 1...

Embodiment 2

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

[0040] (2) React 21g of A1 with 28g of hydroxyethyl acrylate at 60-80°C until the NCO content is <0.1%, to obtain 54.1g of A2;

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

[0042] (4) Heat 99.1g of A3 to 120-140°C, then mix uniformly 10g of acrylic acid, 40g of n-butyl acrylate, 10g of isobornyl acrylate, 20g of methyl methacrylate and initiator tert-butyl peroxide 2.4g, added dropwise to A3 at a constant speed within 3 hours, and kept warm for 1 hour after dropping, to obtain 181.5g A4;

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

[0044] (6) Cool 149g of A5 to 60°C, add 12g of neutralizing agent dimethylethanolamine dropwise at a constant speed w...

Embodiment 3

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

[0048] (2) 21g of A1 was reacted with 30g of hydroxypropyl acrylate at 60-80°C until the NCO content was <0.1%, and 56.1g of A2 was obtained;

[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 of A3 to 120-140°C, then mix uniformly 9g of acrylic acid, 40g of n-butyl acrylate, 9g of isobornyl acrylate, 20g of methyl methacrylate and initiator tert-butyl peroxide 2.4g, added dropwise to A3 at a constant speed within 3 hours, and kept warm for 1 hour after dropping, to obtain 181.5g A4;

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

[0052] (6) Cool 149g of A5 to 60°C, add 12g of neutralizing agent dimethylethanolamine dropwise at ...

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Abstract

The invention discloses a method for preparing a high-solid star-shaped acrylic polyurethane dispersion used for varnishes, and relates to the technical field of varnishes, using isocyanate trimer and trimethylolpropane to synthesize star cores containing NCO groups A1, star core A1 reacts with hydroxyl-terminated acrylic acid monomer to synthesize star core A2 containing double bonds, add organic solvent to star core A2 to dilute to obtain A3, then add acrylic acid monomer, functional acrylic monomer, and initiator dropwise to A3 to synthesize Star-shaped acrylic polyurethane A4, and then remove the solvent, and after neutralization, add deionized water to disperse at high speed to obtain a high-solid star-shaped acrylic polyurethane dispersion. The acrylic polyurethane dispersion prepared in the present invention can form a highly weather-resistant varnish coating film with extremely high fullness and a gloss of more than 98 by coordinating with amino resin; and the solvent content is lower than 5%, and the solid content is higher than 60%, which is environmentally friendly and pollution-free .

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-shaped acrylic polyurethane dispersion used for varnishes. Background technique: [0002] The existing varnish is mainly oily acrylic resin, the disadvantage is that the solvent content is between 50-70%, and the advantage is that the paint film is full, the gloss is high, and the weather resistance is good. 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%, and the fullness is poor. The advantage is good weather resistance and high gloss. The disadvantage of water-soluble polyester is that the solvent content is between 10-30%, and the weather resistance is poor. The advantage is fullness and high gloss. [0003] Patent CN201110100557.9 discloses an anti-sagging and anti-foaming overglaze varnish for automobile coating a...

Claims

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Application Information

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Patent Type & Authority Patents(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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