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Synthesis process for air-drying waterborne polyurethane and dispersion thereof

A water-based polyurethane and synthetic process technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems that are rarely reported, and achieve the effects of accelerating moisture volatilization, wide sources, and easy industrial production

Inactive Publication Date: 2014-11-05
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the preparation of air-drying water-based polyurethane dispersions suitable for industrial production.

Method used

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  • Synthesis process for air-drying waterborne polyurethane and dispersion thereof
  • Synthesis process for air-drying waterborne polyurethane and dispersion thereof
  • Synthesis process for air-drying waterborne polyurethane and dispersion thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a four-necked reaction flask equipped with a stirrer, thermometer, water separator and nitrogen inlet, add linoleic acid and trimethylolpropane, the molar ratio of linoleic acid and trimethylolpropane is 3:2, toluene Reflux, react at 100-120°C under nitrogen gas for 5 hours, and dehydrate the obtained solution at a temperature of 110°C and a vacuum of 0.9 MPa for 2 hours to obtain a chain extender B containing a dry oil structure. In addition, add 50 grams of polyε-caprolactone diol with a molecular weight of 2000 and 20 grams of isophorone diisocyanate into a three-necked reaction flask equipped with a thermometer, a stirrer, and a reflux condenser, stir evenly, and gradually heat up to 90°C React for 2 hours, cool down to 60°C, add 4 grams of hydrophilic chain extender A, namely dimethylolpropionic acid, and 15 grams of chain extender B containing dry oil structure, keep warm for 5 hours, and gradually increase the viscosity as the reaction progresses. Add acetone ...

Embodiment 2

[0025] The synthesis process was the same as in Example 1, except that the poly(epsilon)-caprolactone diol with a molecular weight of 2000 was replaced with polytetrahydrofuran diol with a molecular weight of 2000, and the obtained product was a 42% air-drying water-based polyurethane dispersion.

Embodiment 3

[0027] The synthesis process was the same as in Example 1, except that the poly(ε-caprolactone) diol with a molecular weight of 2000 was replaced with polyoxyethylene diol with a molecular weight of 2000, and the obtained product was a 42% air-drying water-based polyurethane dispersion.

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Abstract

The invention discloses a synthesis process for air-drying waterborne polyurethane and dispersion thereof. The process comprises the following steps: (1) mixing diisocyanate and polymer polyol to react to obtain a polyurethane prepolymer; (2) controlling the temperature to 60-80DEG C, dripping hydrophilic chain extender A and chain extender B into the polyurethane prepolymer; carrying out reflux reaction for 1-5 hours; then adding alkali to form salt; and adding water to disperse and emulsify; and adding catalyst to obtain the air-drying waterborne polyurethane dispersion. The synthesis process is characterized in that dry oil grease structure containing active methylene is introduced in the polyurethane structure to synthesize air-drying waterborne polyurethane dispersion with good self-drying performance and water tolerance. The air-drying waterborne polyurethane dispersion can carry out self cross linking in the air after drying catalyst is added so as to quicken moisture to volatilize, and the drying rate is obviously improved. The air-drying waterborne polyurethane dispersion has the advantages of abundant raw material resource, simple synthesis technology and wide application prospect in the building coating field, is cheap and easy to obtain and is easy for industrial production.

Description

technical field [0001] The invention relates to a synthesis process of air-drying water-based polyurethane and its dispersion liquid, belonging to the field of new chemical material preparation. Background technique [0002] Because water-based polyurethane dispersion uses water as the dispersion medium of the dispersion, only water volatilizes into the atmosphere during use, and has no adverse effects on the environment. It is an excellent green environmental protection material and has been widely recognized by many foreign scholars in recent years. focus on. The patent US5004779 (1991) published by Bayer company Blum H adopts isophthalic acid, phthalic anhydride, pentaerythritol, cyclohexyl dimethanol, etc. to mix, and synthesize alkyd resin at 140 ° C under the action of a catalyst. This alkyd resin Diisocyanate and DMPA react to obtain a polyurethane prepolymer, and triethylamine neutralizes and disperses with water to obtain a so-called water-based urethane oil. PAJE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/66C08G18/10C08J3/03C09D175/14
Inventor 杨建军吴庆云张建安吴明元周亭亭
Owner ANHUI UNIVERSITY
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