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Self-crosslinked oxidation and high-efficient dispersion with water polyurethane and production thereof

The technology of water-based polyurethane and polyurethane prepolymer is applied in the coating and preparation field of high-efficiency oxidative self-crosslinking water-based polyurethane dispersion, and can solve the problems of low non-volatile content, long drying time, low hardness of paint film, etc. Achieving good market prospects and improving the overall performance of the coating film

Active Publication Date: 2006-08-16
广东天银实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-volatile content is low, and because water-based polyurethane uses water with a large latent heat of evaporation as the dispersion medium, it has the disadvantages of long drying time and low paint film hardness when used as a finishing agent for plastic, wood, metal and other substrates.
The solution is to add a certain amount of cross-linking agent to the water-based system to increase the drying speed of the coating film, but after adding these substances, the storage stability of the system will be affected to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, the synthesis of polyester polyol resin (A-1).

[0028] (1) Synthetic formula:

[0029] Raw material name Dosage (parts by weight):

[0030] Adipic acid 260;

[0031] Hexahydrophthalic anhydride 300;

[0032] Neopentyl glycol 360;

[0033] Hexylene glycol 120;

[0034] Organotins 1.12.

[0035] (2) Synthesis process:

[0036] Add adipic acid, hexahydrophthalic anhydride, neopentyl glycol, hexanediol and a catalyst into a reactor equipped with a stirrer, a thermometer, a fractionating column and a nitrogen conduit; take 1.5 hours to raise the temperature of the kettle to 160°C for esterification At the beginning of the reaction, water will distill out, reduce the heating rate to make the reaction proceed smoothly, control the temperature of the kettle at about 160-200°C, and keep the temperature at the upper part of the fractionation column at 105°C for 3-4 hours. When the temperature starts to drop, slowly raise the temperature to 220°C, keep warm u...

Embodiment 2

[0037] Embodiment 2, the synthesis of polyester polyol resin (A-2).

[0038] (1) Synthetic formula:

[0039] Raw material name Dosage (parts by weight):

[0040] Adipic acid 371;

[0041] Maleic anhydride 249;

[0042] Trimethylolpropane 10.6;

[0043] Neopentyl glycol 187;

[0044] 1,4-Cyclohexanedimethanol 284;

[0045] Butanediol 179;

[0046] Organotins 1.6.

[0047] (2) The synthesis process is the same as in Example 1. Resin hydroxyl value: 78mgKOH / g (resin), recorded as A-2.

Embodiment 3

[0048] Embodiment 3, the synthesis of polyester polyol resin (A-3).

[0049] (1) Synthetic formula:

[0050] Raw material name Dosage (parts by weight):

[0051] Adipic acid 378;

[0052] 1,4-Cyclohexanedicarboxylic acid 443;

[0053] Trimethylolpropane 16.5;

[0054] Neopentyl glycol 187;

[0055] 1,2-propanediol 150;

[0056] 2-Ethyl-2-butyl-1,3-propanediol 318;

[0057] Organotins 2.2.

[0058] (2) Synthesis process is the same as example 1. Resin hydroxyl value: 50mgKOH / g (resin), recorded as A-3.

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Abstract

A high-efficient and oxide self-cross-linking disperser of water-based polyurethane and its production are disclosed. The disperser consists of polyester polybasic alcohol (A) containing at least two hydroxyl groups, drying oil long oil alkyd resin (B) containing at least one hydroxyl group, vulcabond containing at least one aromatic or fatty group and water-based functional monomer. It has better coating comprehensive performance and costs low. It can be used for plastic, wood and metal.

Description

Technical field: [0001] The invention relates to a high-efficiency oxidative self-crosslinking type water-based polyurethane dispersion coating for plastic, wood, metal and other substrates and a preparation method thereof. Background technique: [0002] Polyurethane has excellent physical and chemical properties, such as: chemical stability, friction resistance, toughness, elasticity, as a coating, it has been widely used in the coating of plastic, wood, metal and other substrates. Traditional polyurethane coatings are solvent-based, and the system contains some organic solvents. These solvents evaporate into the air during the film-forming process, causing environmental pollution. Volatile organic solvents not only pollute the environment, but also increase the cost. A feasible way to solve this problem is to replace the organic solvent with water as the dispersed phase of the system. Methods for dispersing water-insoluble polymers in the water phase include forced exter...

Claims

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Application Information

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IPC IPC(8): C08G18/40C08G18/72C08G18/10C08J3/03
Inventor 闫福安蔡明生吕任扬陈潮汉
Owner 广东天银实业有限公司
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