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Internal crosslinking type self-extinction waterborne polyurethane dispersion and preparation method thereof

A water-based polyurethane, self-extinguishing technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of unsatisfactory cross-linking efficiency and low cross-linking degree, and achieve a stable and controllable reaction process, simple process and dangerous. Low coefficient effect

Active Publication Date: 2021-11-12
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

Most of the self-dulling water-based polyurethane emulsions reported by internal cross-linking modification adopt macromolecular dibasic alcohols as soft segments, and the trifunctional cross-linking agent TMP (such as patent CN110951039A, CN110669197A, CN110407996A, CN110041493A .
The present invention selects trifunctional polyols as the soft segment, and can obtain polyurethane emulsion with internal cross-linking properties without adding a cross-linking agent, with high cross-linking degree and simple process flow; and the internal cross-linking self- Matting water-based polyurethane is rarely reported

Method used

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Examples

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preparation example Construction

[0048] The second aspect of the present invention provides a kind of preparation method of internal crosslinking type self-dulling aqueous polyurethane dispersion, and specific preparation steps comprise:

[0049] S1. react macromolecular polyol and diisocyanate to obtain prepolymer A;

[0050] S2. Adding the hydrophilic chain extender and the polyol chain extender to the prepolymer A to react to obtain the prepolymer B;

[0051] S3. aliphatic ketone and neutralizing agent are added in prepolymer B, react to obtain intermediate product;

[0052] S4. Add the intermediate product into water, then add the post-chain extender, stir, and distill to obtain the product.

[0053] In some preferred embodiments, the reaction temperature of the S1 step is 60-95° C., and the reaction time is 1-3 h.

[0054] In some preferred embodiments, the reaction temperature of the step S2 is 58-85°C, and the reaction time is 2-5h.

[0055] In some preferred embodiments, the reaction temperature of...

Embodiment 1

[0061] This embodiment provides an internal cross-linking type self-dulling aqueous polyurethane dispersion. According to weight percentage, its raw materials include macromolecular polyol 15%, diisocyanate 11%, hydrophilic chain extender 0.7%, polyol chain extender 2.2% neutralizer, 0.4% neutralizer, 1% post-chain extender, 8% aliphatic ketone, and water to supplement the balance.

[0062] The macromolecular polyol is polycaprolactone trihydric alcohol with an average molecular weight of 3000; purchased from Shenzhen Guanghua Weiye Co., Ltd.

[0063] The diisocyanate is isophorone diisocyanate.

[0064] The hydrophilic chain extender is dimethylol butyric acid; the polyhydric alcohol chain extender is 1,4-butanediol.

[0065] Described neutralizing agent is triethylamine.

[0066] The post-chain extender is ethylenediamine.

[0067] The aliphatic ketone is dimethyl ketone.

[0068] The preparation steps of described internal crosslinking type self-extinction aqueous polyu...

Embodiment 2

[0074] This embodiment provides an internal cross-linking type self-dulling aqueous polyurethane dispersion. According to weight percentage, its raw materials include macromolecular polyol 14%, diisocyanate 12%, hydrophilic chain extender 1%, polyol chain extender 0.3% neutralizer, 1% neutralizer, 0.3% post-chain extender, 10% aliphatic ketone, and water to make up the balance.

[0075] The macromolecular polyol is polyoxypropylene triol with an average molecular weight of 1000; purchased from Shandong Bluestar Dongda Co., Ltd.

[0076] The diisocyanate is isophorone diisocyanate.

[0077] The hydrophilic chain extender is dimethylol butyric acid; the polyhydric alcohol chain extender is diethylene glycol.

[0078] Described neutralizing agent is triethylamine.

[0079] The post-chain extender is ethylenediamine.

[0080] The aliphatic ketone is methyl ethyl ketone.

[0081] The preparation steps of described internal crosslinking type self-extinction aqueous polyurethane ...

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Abstract

The invention relates to the technical field of waterborne polyurethane resin, in particular to an internal crosslinking type self-extinction waterborne polyurethane dispersion and a preparation method thereof. The internal crosslinking type self-extinction waterborne polyurethane dispersion comprises the following raw materials in percentage by weight: 7-40% of macromolecular polyol, 5-30% of diisocyanate, 0.4-2.0% of a hydrophilic chain extender, 0.1-5% of a polyol chain extender, 0.05-2% of a neutralizer, 0.1-5% of a post chain extender, 5-25% of aliphatic ketone and the balance of water. According to the invention, macromolecular trihydric alcohol is used as a soft segment, so that the polyurethane emulsion with internal crosslinking property can be obtained without adding a crosslinking agent; the preparation method is high in crosslinking degree and simple in technological process, has a better matting effect and is suitable for products such as leather, paper and films needing matt surfaces.

Description

technical field [0001] The invention relates to the technical field of waterborne polyurethane resins, in particular to an internal crosslinking type self-dulling waterborne polyurethane dispersion and a preparation method thereof. Background technique [0002] The vibrant color of high-gloss waterborne polyurethane coatings has long been a favorite with consumers. However, while high-gloss coatings bring high gloss, there are also many shortcomings. First of all, high-gloss coatings will produce reflections after film formation, which will cause damage to human eyes; second, when there are some defects on the glossy surface, such as slight scratches, grease pollution, dust accumulation and fingerprint retention, etc., it will seriously affect the appearance; With the change of people's aesthetics, products with matting as surface decoration are becoming more and more popular. Matte coatings on leather, paper, fabrics, etc. produce a soft, natural, elegant appearance and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/32C08G18/34C09D175/06C09D175/08
CPCC08G18/6659C08G18/4277C08G18/3206C08G18/348C08G18/6692C08G18/4829C09D175/06C09D175/08
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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