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Waterborne polyester polyurethane finish paint and preparation method thereof

A technology of polyurethane topcoat and water-based polyester, applied in polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc., can solve problems such as poor stability and decline in paint film performance, and achieve excellent water resistance

Active Publication Date: 2021-04-09
上海奇想青晨新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional water-based polyester is easy to hydrolyze the ester bond under alkaline conditions, resulting in the decline of various properties of the paint film. Therefore, the storage time of the current water-based polyester polyurethane topcoat is less than 3 months, and the stability is poor.

Method used

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  • Waterborne polyester polyurethane finish paint and preparation method thereof
  • Waterborne polyester polyurethane finish paint and preparation method thereof
  • Waterborne polyester polyurethane finish paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Waterborne polyester polyurethane topcoat, component A includes the following components and their mass percentages:

[0045]

[0046] Component B is isophorone diisocyanate.

[0047] The preparation process is as follows: add deionized water into the pulling cylinder, then add BYK-190 dispersant and stir evenly, add titanium dioxide and precipitated barium sulfate in sequence under stirring, disperse at high speed for 30 minutes, and then use a horizontal sand mill to grind the paper When the fineness reaches 20 μm, dipropylene glycol dibutyl ether, N,N-dimethylethanolamine, BYK-024 and BYK-346 are added in sequence, and stirred for 45 minutes. Finally, WT105A is added to thicken and stirred for 60 minutes to obtain the water-based polymer of this embodiment. Ester polyurethane finish.

[0048] The nano-modified water-based polyester resin is composed of the following:

[0049] The polymer solution includes the following components and mass percentages:

[0050] ...

Embodiment 2

[0059] Waterborne polyester polyurethane topcoat, component A includes the following components and their mass percentages:

[0060]

[0061] Component B is the commercially available product Bayhydur 2655.

[0062] The preparation process is as follows: adding deionized water into the pulling cylinder, then adding TEGO715W dispersant and stirring evenly. Add titanium dioxide, carbon black, and precipitated barium sulfate in sequence under stirring, disperse at high speed for 45 minutes, and then use a horizontal sand mill to grind the paper to a fineness of 20 μm. Add propylene glycol dibutyl ether, triethylamine, BYK-028 and BYK-333 in turn, and stir for 30min. Finally, BYK-425 was added to thicken, and stirred for 45 minutes to obtain the water-based polyester polyurethane topcoat of this example.

[0063] Preparation of polymer solutions:

[0064]

[0065] Polymerization process: add isophthalic acid, trimethylolpropane and tall oil acid to the reaction kettle, an...

Embodiment 3

[0071] Waterborne polyester polyurethane topcoat, component A includes the following components and their mass percentages:

[0072]

[0073] The B component is the commercially available product Aquolin 270.

[0074] The preparation process is as follows: adding deionized water into a pulling cylinder, then adding BYK-191 dispersant and stirring evenly. Add titanium dioxide, phthalocyanine blue, and talc in sequence under stirring, disperse at high speed for 60 minutes, and then use a horizontal sand mill to grind the paper to a fineness of 20 μm. Diethylene glycol dibutyl ether, 2-amino-2-methyl-1-propanol, TEGO902W and TEGO450 were sequentially added, and stirred for 60 min. Finally, WT105A was added to thicken and stirred for 60 minutes to obtain the water-based polyester polyurethane topcoat of this example.

[0075] Preparation of polymer solutions:

[0076]

[0077] Polymerization process: add trimethylolpropane, diethylene glycol, isophthalic acid, phthalic an...

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Abstract

The invention discloses waterborne polyester polyurethane finish paint and a preparation method thereof. The waterborne polyester polyurethane finish paint is composed of a component A and a component B. The component A is prepared from, by mass, 50-70% of nano-modified waterborne polyester resin, 2-4% of a coalescing agent; 0.5-5% of a pH regulator; 1-4% of a dispersant; 0.1-0.4% of a defoaming agent; 10-25% of a pigment; 10-25% of a filler; 0.1-0.5% of a wetting leveling agent; 0.1-0.5% of a thickening agent; and 8-15% of deionized water. The component B is an isocyanate curing agent. The water-based polyester polyurethane finish paint prepared by the invention has excellent water resistance, chemical resistance and weather resistance, and can be used as finish paint in the field of industrial corrosion prevention.

Description

technical field [0001] The invention belongs to the field of water-based coatings, in particular to a water-based polyester polyurethane topcoat and a preparation method thereof. Background technique [0002] Waterborne polyester resin is a polyhydroxy component, and the film-forming material composed of isocyanate has excellent mechanical properties, gloss and fullness. However, the conventional water-based polyester is easy to hydrolyze the ester bond under alkaline conditions, resulting in the decline of various properties of the paint film. Therefore, the storage time of the current water-based polyester polyurethane topcoat is less than 3 months, and the stability is poor. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to solve the above problems and provide a water-based polyester polyurethane topcoat and a preparation method thereof, which have excellent water resistance, chemical resistance and weather resistance, and can be used as a top...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D175/06C09D5/08C09D7/61
CPCC09D175/14C09D175/06C09D5/08C09D7/61C08K2003/3045C08K2201/011C08K3/30C08K3/34
Inventor 赵蔚菡李超孙涛薛鹏
Owner 上海奇想青晨新材料科技股份有限公司