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A kind of polyurethane polyol dispersion of two-component water-based wood paint and preparation method thereof

A technology of polyurethane polyol and water-based wood lacquer is applied in the field of polyurethane polyol dispersion and its preparation, which can solve the problems of complex production process and high cost, and achieve the advantages of increasing water resistance, high chemical resistance and excellent light stability. Effect

Active Publication Date: 2016-04-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-based polyurethane coating provided by the invention has high hardness, good water resistance and no pollution, but the production process is relatively complicated and the cost is relatively high

Method used

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  • A kind of polyurethane polyol dispersion of two-component water-based wood paint and preparation method thereof
  • A kind of polyurethane polyol dispersion of two-component water-based wood paint and preparation method thereof
  • A kind of polyurethane polyol dispersion of two-component water-based wood paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example example 1

[0038] In a 500ml four-necked flask equipped with a stirring device, a reflux condenser and a thermometer, add 200g of polyoxyethylene glycol with a molecular weight of 1000, add 6g of dibutyltin dilaurate dropwise, and start to add dropwise at a temperature of 65°C in an oil bath. 104.8g of dicyclohexylmethane diisocyanate, after the dropwise addition, react for one hour, then raise the temperature to 80°C, react for one hour, and then raise the temperature to 95°C for reaction. Then measure the content of the -NCO group once every half hour, when the content of the -NCO group reaches the theoretical value, the polyurethane prepolymer is obtained, and then in the polyurethane prepolymer, add the N- Methylpyrrolidone solution, 15.9g diethylene glycol and 13.4g trimethylolpropane, reacted for several hours, during which the content of the -NCO group was measured, and when the -NCO group was no longer present in the reaction, a hydroxyl-containing polyurethane was obtained The p...

Embodiment 2

[0040] Referring to formula 2 in Table 1, the polyoxypropylene diol with a molecular weight of 2000 is selected as the oligomer polyol, and the preparation method is the same as in Example 1. The properties and film-forming mechanical properties of the obtained polyurethane polyol dispersion are shown in Table 2.

Embodiment 3

[0042] Referring to formula 3 in Table 1, polyoxyethylene diol with a molecular weight of 600 is selected as the oligomer polyol, and the preparation method is the same as in Example 1. The properties and film-forming mechanical properties of the obtained polyurethane polyol dispersion are shown in Table 2.

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Abstract

The invention discloses polyol polyurethane dispersions of two-component waterborne wood lacquer and a preparation method of the polyol polyurethane dispersions. The preparation method of the polyol polyurethane dispersions includes the following steps: step 1, oligomeric polyols and a hydrophilic chain extender are dried for more than eight hours in a vacuum state; step 2, the oligomeric polyols and a catalytic agent are added into polyisocyanates in proportion and are heated at the temperature of 65-95 DEG C in a stepwise heating mode for a reaction, and after the number of an isocyanate (-NCO) group reaches a theoretical value in the reaction, polyurethane prepolymers are obtained; step 3, the hydrophilic chain extender, a small-molecular dihydric alcohol chain extender and a cross-linking agent are added into the polyurethane prepolymers for a reaction for multiple hours, the content of the -NCO group is enabled to reach a theoretical end point, and then hydroxyl group-containing polyurethane prepolymers are obtained; and step 4, the hydroxyl group-containing polyurethane prepolymers are cooled to the temperature of 45 DEG C, a neutralizing agent is added into the hydroxyl group-containing polyurethane prepolymers and stirred for more than 30 minutes, then the hydroxyl group-containing polyurethane prepolymers are cooled to the room temperature, and deionized water is added for emulsification at a high speed. The two-component waterborne wood lacquer prepared with the obtained polyol polyurethane dispersions is good in coating performance and has excellent mechanical properties, a water resistance property, a yellowing resistance property and high hardness.

Description

technical field [0001] The invention relates to a polyurethane polyol dispersion and a preparation method thereof, in particular to a polyurethane polyol dispersion synthesized from alicyclic isocyanate and a preparation method thereof. Background technique [0002] Polyurethane has the advantages of high strength, good wear resistance, strong adhesion, good chemical resistance, high temperature resistance, good gloss, etc. It is widely used in coatings, adhesives, water-based leather finishing agents, fabric finishing agents, etc. . In the direction of synthetic coatings, the biggest advantage of water-based polyurethane coatings is that the amount of organic volatile solvents (VOC) is greatly reduced or organic solvents are basically eliminated, and they have good low temperature resistance, strong adhesion, non-combustibility, non-toxicity, and no environmental pollution. , saving energy and so on. [0003] Water-based polyurethane is divided into one-component and two-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/44C08G18/32C08G18/34C09D175/06C09D175/08
Inventor 戴李宗潘尹银程玲罗伟昂吴锦添许延利刘李许一婷曾碧榕刘新瑜何凯斌
Owner XIAMEN UNIV