High-solid-content self-extinction waterborne polyurethane dispersion and preparation method thereof

A water-based polyurethane, high solid content technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor adhesion, easy to break and fall off, and the coating is brittle, so as to achieve low production, storage and transportation costs, The effect of fast drying and simple process

Active Publication Date: 2021-11-23
厦门威亮光学涂层技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] By providing a high solid content self-dulling water-based polyurethane dispersion, the present invention solves the problems that traditional matting agents cause the coating to be brittle, poor in hand feeling, poor in adhesion, easy to break and fall off, etc., and the solid content of self-dulling polyurethane Low defect, realizes a water-based polyurethane with high solid content, strong matting, and strong workability

Method used

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  • High-solid-content self-extinction waterborne polyurethane dispersion and preparation method thereof

Examples

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preparation example Construction

[0053] The second aspect of the present invention provides a kind of preparation method of high solid content self-delustering aqueous polyurethane dispersion, and specific preparation steps comprise:

[0054] S1. Add polymer polyol and isocyanate in the reactor, and react to generate the first prepolymer;

[0055] S2. Add a first chain extender, an organic solvent, and a catalyst to the first prepolymer, and react to obtain a second prepolymer;

[0056] S3. Transfer the second prepolymer to a high-speed emulsifier, add water, and stir to obtain the finished product;

[0057] The second chain extender is added in at least one step of S1, S2, and S3.

[0058] In some preferred embodiments, the reaction temperature of the S1 step is 60-95° C., and the reaction time is 1-3 h.

[0059] Further preferably, the reaction temperature of the S1 step is 90° C., and the reaction time is 2 hours.

[0060] In some preferred embodiments, the reaction temperature of the step S2 is 30-80°C...

Embodiment 1

[0069] This embodiment provides a high solid content self-dulling aqueous polyurethane dispersion. According to weight percentage, its raw materials include: polymer polyol 26%, isocyanate 16%, first chain extender 1%, second chain extender 1%, catalyst 0.1%, organic solvent 17%, water to make up the balance;

[0070] The first chain extender is 1,2-dihydroxy-propanesulfonic acid triethylamine salt, which comes from Xiamen Weiliang Optical Coating Technology Co., Ltd.

[0071] The polymer polyol is polybutylene adipate diol with an average molecular weight of 1000, purchased from Dongguan Suguang Plastic Raw Materials Co., Ltd.

[0072] The isocyanate is isophorone diisocyanate.

[0073] The second chain extender is a polyhydric alcohol, specifically trimethylolpropane.

[0074] The catalyst is an organic tin catalyst, specifically dibutyltin dilaurate.

[0075] The organic solvent is acetone with a boiling point of 56.3°C.

[0076] The preparation method of described high...

Embodiment 2

[0081] This embodiment provides a high solid content self-dulling aqueous polyurethane dispersion. According to weight percentage, its raw materials include: polymer polyol 21%, isocyanate 16%, first chain extender 1%, second chain extender 3.4%, catalyst 0.1%, organic solvent 18%, water to make up the balance;

[0082] The first chain extender is 1,2-dihydroxy-propanesulfonic acid triethylamine salt, which comes from Xiamen Weiliang Optical Coating Technology Co., Ltd.

[0083] The polymer polyol is polyoxypropylene triol with an average molecular weight of 3000, purchased from Chengdu Bright Chemical Technology Co., Ltd.

[0084] The isocyanate is isophorone diisocyanate.

[0085] The second chain extender is a polyol and a polyamine; the polyol is specifically dimethylol butyric acid and diethylene glycol, and the polyamine is specifically ethylenediamine; the dimethylol butyrate The weight ratio of acid, diethylene glycol and ethylenediamine is 1:2:0.4.

[0086] The cat...

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Abstract

The invention relates to the technical field of waterborne polyurethane resin, in particular to a high-solid-content self-extinction waterborne polyurethane dispersion and a preparation method thereof. The high-solid-content self-extinction waterborne polyurethane dispersion comprises the following raw materials in percentage by weight: 15-40% of polymer polyol, 10-30% of isocyanate, 0.1-3% of a first chain extender, 0.3-15% of a second chain extender, 0.01-0.2% of a catalyst, 5-30% of an organic solvent and the balance of water, wherein the first chain extender is a dihydroxy sulfonic acid amine salt compound. According to the invention, 1, 2-dihydroxy-propanesulfonic acid amine salt is adopted as a preparation raw material of polyurethane, and acts together with substances such as specific polymer polyol, so that the solid content of the waterborne polyurethane is remarkably increased, and the production, storage and transportation costs are low; and the low-boiling-point organic solvent is adopted for smooth reaction, the problems of high danger coefficient and the like caused by introduction of a high-boiling-point solvent are avoided, the whole process is simple and convenient, the reaction process is safe, and the high-solid-content self-extinction waterborne polyurethane dispersion is suitable for being widely popularized in the field of waterborne polyurethane.

Description

technical field [0001] The invention relates to the technical field of water-based polyurethane resins, in particular to a high-solid-content self-dulling water-based polyurethane dispersion and a preparation method thereof. Background technique [0002] The traditional matting resin is prepared by dispersing the matting agent into the base emulsion under the action of shear force, supplemented with additives with functions such as anti-sedimentation and thickening; after film formation, it can form a surface with high roughness The material diffuses and scatters light to achieve a matting effect. Common matting agents can be divided into two categories: organic matting agents and inorganic matting agents; organic matting agents mainly include metal soaps, waxes and tung oil; inorganic matting agents mainly include diatomaceous earth, kaolin, talc and silica. This kind of matting resin has obvious matting effect, but the addition of matting agent will cause problems such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G18/08C08G18/48C08G18/34C09D175/06C09D175/08
CPCC08G18/6644C08G18/4238C08G18/3206C08G18/3855C08G18/08C08G18/4829C08G18/6692C08G18/348C09D175/06C09D175/08
Inventor 姚红涛司园精吴后胜张崇照
Owner 厦门威亮光学涂层技术有限公司
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