Water-soluble polyurethane for wood lacquer and preparation method thereof

A water-based polyurethane and wood paint technology, applied in the field of coatings, can solve the problems of poor solvent resistance and low hardness, and achieve the effects of solving low hardness, increasing cross-linking density, improving hardness and water resistance

Active Publication Date: 2011-05-25
安徽好思家涂料股份有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a water-based polyurethane for wood ware and its preparation method, to solve the problems of water resistance, poor solvent resistan

Method used

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Embodiment Construction

[0021] (1) Water-based polyurethane for wood lacquer, consisting of the following raw materials in parts by weight:

[0022] Polycarbonate diol 170.46

[0023] Isophorone diisocyanate 131.56

[0024] Catalyst stannous octoate 0.57

[0025] Dimethylolpropionic acid 17.05

[0026] Dihydroxyacetone 2.84

[0027] 1,4-Butanediol 19.01

[0028] Acetone 4-5

[0029] Triethylamine 12.86

[0030] Ethylenediamine 6.56

[0031] Deionized water 633.55

[0032] Adipic acid dihydrazide 5.54.

[0033] (2), the preparation method of wood lacquer water-based polyurethane:

[0034] a. Add polycarbonate diol in parts by weight to a four-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser, vacuumize and dehydrate at 110°C for 1 hour, then cool down to 60°C, and add in parts by weight Isophorone diisocyanate, dimethylolpropionic acid and catalyst stannous octoate are heated to 75-80°C for 2-3 hours to obtain a reaction solution;

[0035] b. Add dihydrox...

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Abstract

The invention discloses water-soluble polyurethane for the wood lacquer and a preparation method thereof. The water-soluble polyurethane comprises the following raw materials in parts by weight: 165-175 parts of polycarbonate diol, 131-132 parts of isophorone diisocyanate, 0.4-0.6 part of catalyst, 16.5-17.5 parts of dihydromethyl propionic acid, 2.7-3 parts of dihydroxyacetone, 18.5-19.5 parts of 1,4-butanediol, 4-5 parts of acetone, 12.5-13 parts of triethylamine, 6-7 parts of ethylenediamine, 628-638 parts of deionized water and 5-6 parts of adipic acid dihydrazide. The preparation method adopts the preparation technology combining the acetone method with pre-polymer dispersion method, thus effectively reducing the dosage of acetone and increasing the molecular weight of the generated polyurethane; and when the prepared water-soluble polyurethane dispersion forms a film, with the volatilization of water and the reduction of the pH value, the self-crosslinking reactions of ketonic carbonyl and hydrazide group can be performed, thus the after crosslinking density of the film can be increased and the hardness and water resistance of the the film can be increased.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to water-based polyurethane for wood ware and a preparation method thereof. Background technique [0002] With the enhancement of social environmental protection awareness, a series of environmental protection measures such as low-carbon economy, green environmental protection, energy saving and emission reduction have been put forward one after another, and the coating industry is also developing in the direction of low-VOC water-based coatings. Polyurethane resin has attracted widespread attention from all walks of life because of its good physical and mechanical properties, certain water resistance, and excellent low-temperature flexibility. Solvent-based polyurethane coatings are more and more restricted due to their high VOC emissions, which seriously pollute the ecological environment. Water-based polyurethane coatings not only have the performance of solvent-based polyureth...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/44C09D175/04
Inventor 朱宗奎刘长明
Owner 安徽好思家涂料股份有限公司
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