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Cationic waterborne polyurethane and preparation method thereof

A water-based polyurethane and cationic technology, applied in polyurea/polyurethane coatings, coatings, etc., to achieve strong permeability, avoid bleeding, and fast drying

Active Publication Date: 2011-06-15
安徽好思家涂料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a cationic water-based polyurethane and its preparation method, to solve the bleeding phenomenon in the coating of water-based wood coatings, and to overcome the safety and environmental protection problems in the use of two-component polyurethane wood sealing primers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1), a cationic water-based polyurethane for water-based wood sealing primer, which is prepared from the following raw materials in parts by weight: polyether N220: 140.89, toluene diisocyanate (TDI): 103.35, trimethylol Propane (TMP): 6.08, 1,4-butanediol (BDO): 24.52, N-methyldiethanolamine (MDEA): 14.89, acetone: 4-5, acetic acid (Ac): 7.51, deionized water: 694.78.

[0022] (2), preparation method:

[0023] a. Add polyether N220 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, add toluene diisocyanate, and heat up to React at 75-80°C for 2-3 hours to obtain a reaction solution;

[0024] b. Add the mixed trimethylolpropane and 1,4-butanediol mixed liquid into the reaction solution in parts by weight, control the temperature and react at 20°C for 2 hours, add acetone during the reaction, reduce the viscosity of the reaction system, a...

Embodiment 2

[0027] (1), a cationic water-based polyurethane for water-based wood sealing primer, which is prepared from the following raw materials in parts by weight: polyether N220: 158.05, toluene diisocyanate (TDI): 98.19, trimethylol Propane (TMP): 5.96, 1,4-butanediol (BDO): 24.03, N-methyldiethanolamine (MDEA): 11.93, acetone: 4-5, acetic acid (Ac): 6.01, deionized water: 695.82.

[0028] Step (2) is the same as in Example 1.

[0029] Black walnut veneer: Use a water-based wood fiber brush to apply two coats of water-based wood sealing primer. After 3 hours of drying, apply 2-3 coats of water-based wood white primer. After smoothing, apply 2 coats of water-based wood white primer paint. Severe bleeding occurred when the sealing primer was not applied, but no bleeding was observed after painting.

Embodiment 3

[0031] (1), a cationic water-based polyurethane for water-based wood sealing primer, which is prepared from the following raw materials in parts by weight: polyether N220: 140.05, toluene diisocyanate (TDI): 109.49, trimethylol Propane (TMP): 6.96, 1,4-butanediol (BDO): 28.03, N-methyldiethanolamine (MDEA): 9.574, acetone: 4-5, acetic acid (Ac): 6.76, deionized water: 695.30.

[0032] Step (2) is the same as in Example 1.

[0033] Dark high-density board: apply two coats of water-based wood sealing primer with a water-based wood fiber brush, 3 hours after drying, apply 2-3 coats of water-based wood white primer, and after smoothing, apply 2 coats of water-based wood white primer top coat. Severe bleeding occurred when the sealing primer was not applied, but no bleeding was observed after painting.

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PUM

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Abstract

The invention discloses cationic waterborne polyurethane and a preparation method thereof. The waterborne polyurethane is prepared from the following raw materials in parts by weight: 140-160 parts of polyether N220, 90-110 parts of toluene diisocynate, 5-7 parts of trimethylolpropane, 22-30 parts of 1,4-butanediol, 8-16 parts of N-methyldiethanolamine, 4-5 parts of acetone, 5-8 parts of acetic acid and 690-700 parts of deionized water. By adopting the woodware sealing primer prepared from the waterborne polyurethane resin of the invention, the bleeding phenomenon can be efficiently solved during the coating of the waterborne woodware paint; and the sealing primer is safe, environmentally friendly, nonpoisonous and tasteless and can meet the requirements of full hydration and environmental protection in the coating process of the woodware paint.

Description

technical field [0001] The invention relates to the technical field of water-based wood sealing primer, in particular to a cationic water-based polyurethane and a preparation method thereof. Background technique [0002] As people pay more and more attention to home air quality, water-based wood coatings are safe and environmentally friendly. They do not contain chemical organic solvents and toxic substances such as benzene series, ketones, and formaldehyde, and completely avoid harmful substances in general grease paints and polyester paints. , Gradually get people's acceptance and recognition. However, the dark-colored boards used in home decoration are often repaired with water-based colorants before leaving the factory to make the color of the boards uniform. Some wooden boards contain chemical substances such as tannic acid. When the wood is painted, there will be a phenomenon of colorant floating or bleeding, which cannot be covered by multiple coats. The two-compone...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C09D175/08
Inventor 王奇
Owner 安徽好思家涂料股份有限公司
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