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Preparation method of matting leather water-based polyurethane coating agent

A water-based polyurethane self-dulling technology, applied in polyurea/polyurethane coatings, leather surface treatment, small raw leather/big raw leather/leather/fur treatment, etc., can solve problems such as insufficient color brightness, air pollution, poor compatibility, etc. , to achieve the effect of solving the problem of storage stability, good light stability, and good compatibility

Active Publication Date: 2014-04-23
SICHUAN DOWELL SCI & TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the 1960s, solvent-based polyurethane has been widely used. However, the use of organic solvents causes air pollution and is more or less toxic. In recent years, people's awareness of environmental protection has continued to increase, which has promoted the development of water-based polyurethane materials.
[0006] Because the material structure of these matting agents is quite different from that of polyurethane molecules, their compatibility is poor, and delamination is prone to occur during storage.
In addition, due to the large difference in the refractive index between the matting agent and the polyurethane resin, it is easy to have poor film-forming permeability after coating, and the color brightness after coating is not enough, and the phenomenon of "gray and white" appears

Method used

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  • Preparation method of matting leather water-based polyurethane coating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of self-dulling type leather waterborne polyurethane finishing agent, preparation method is as follows:

[0038] A Preparation of Polyurethane Component A

[0039] a) Mix isocyanate trimer, diisocyanate, small molecule hydrophilic monomer, macromolecular diol monomer and catalyst, and react at 60°C for 8 hours;

[0040] b) The temperature of the reaction solution was lowered to 30°C, and triethylamine was added, and reacted for 30 minutes;

[0041] c) Add deionized water, stir and disperse for 2 hours to obtain water-based polyurethane component A emulsion;

[0042] B Preparation of Polyurethane Component B

[0043] a) Mix aliphatic diisocyanate, small molecule hydrophilic monomer, macromolecular diol monomer and catalyst, and react at 60°C for 8 hours;

[0044] b) The temperature of the reaction solution was lowered to 30°C, and triethylamine was added, and reacted for 30 minutes;

[0045] c) Add deionized water, stir and disperse for 2 hours...

Embodiment 2

[0049] The preparation method of self-dulling type leather waterborne polyurethane finishing agent, preparation method is as follows:

[0050] A Preparation of Polyurethane Component A

[0051] a) Mix isocyanate trimer, diisocyanate, small molecule hydrophilic monomer, macromolecular diol monomer and catalyst, and react at 90°C for 2 hours;

[0052] b) The temperature of the reaction solution was lowered to 50°C, and triethylamine was added, and reacted for 10 minutes;

[0053] c) Add deionized water, stir and disperse for 0.5 hour to obtain water-based polyurethane component A emulsion;

[0054] The molecular segment structure of component A is as follows:

[0055]

[0056] Wherein, R is a linear alkyl group.

[0057]

[0058] B Preparation of Polyurethane Component B

[0059] a) Mix aliphatic diisocyanate, small molecule hydrophilic monomer, macromolecular diol monomer and catalyst, and react at 90°C for 2 hours;

[0060] b) The temperature of the reaction solution ...

Embodiment 3

[0067] The preparation method of self-dulling type leather waterborne polyurethane finishing agent, preparation method is as follows:

[0068] A Preparation of Polyurethane Component A

[0069] a) Mix isocyanate trimer, diisocyanate, small molecule hydrophilic monomer, macromolecular diol monomer and catalyst, and react at 70°C for 3 hours;

[0070] b) The temperature of the reaction solution was lowered to 40°C, triethylamine was added, and the reaction was carried out for 20 minutes;

[0071] c) Add deionized water, stir and disperse for 1 hour to obtain water-based polyurethane component A emulsion;

[0072] B Preparation of Polyurethane Component B

[0073] a) Mix aliphatic diisocyanate, small molecule hydrophilic monomer, macromolecular diol monomer and catalyst, and react at 75°C for 4 hours;

[0074] b) The temperature of the reaction solution was lowered to 45°C, triethylamine was added, and the reaction was carried out for 20 minutes;

[0075] c) Add deionized wat...

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Abstract

The invention provides a preparation method of a matting leather water-based polyurethane coating agent. According to the preparation method, a polyurethane A component with a cross-linked structure and a large particle size is synthesized, and is mixed with a B component with a small particle size. The A component possesses many molecular branched chains, size of micellar particles is relatively large, and specific gravity of the A component is less than that of the component B; so that the A component will float on film surface, roughness of the film surface is relatively high, delustering effect is achieved, no delustering agent is needed, excellent transparency is obtained after coating, and no influence on leather substances is caused as the delustering effect is achieved.

Description

technical field [0001] The invention belongs to the field of leather chemical industry, and in particular relates to a preparation method of a self-dulling leather water-based polyurethane finishing agent. Background technique [0002] Waterborne polyurethane refers to a polyurethane emulsion formed by dissolving or dispersing polyurethane in water. Since the 1960s, solvent-based polyurethane has been widely used. However, the use of organic solvents causes air pollution and is more or less toxic. In recent years, people's awareness of environmental protection has continued to increase, which has promoted the development of water-based polyurethane materials. Waterborne polyurethane uses water as the basic medium, has the advantages of no pollution to the environment, energy saving, convenient operation and processing, etc., and has attracted people's attention. [0003] Matting water-based polyurethane finishing agent is an important product in leather finishing agents...

Claims

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Application Information

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IPC IPC(8): C09D175/04D06M15/564C14C11/00C08G18/73C08G18/75C08G18/66C08G18/48C08G18/42C08G18/44C08G18/34C08G18/32
Inventor 赵旭忠曾晓林
Owner SICHUAN DOWELL SCI & TECH INC
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