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Aqueous polyurethane anticorrosive metal primer paint and preparation method thereof

A water-based polyurethane and polyurethane technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve problems such as lack of self-healing ability, uneven dispersion of anti-corrosion agents, anti-corrosion failure, etc., to achieve good self-healing ability, Good and long-lasting anti-corrosion effect, long-lasting effect of anti-corrosion performance

Inactive Publication Date: 2019-03-26
SHAOGUAN HEZHONG CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In order to protect the metal surface and prolong the service life of the metal workpiece, the metal surface needs to be treated in the actual production process. In the prior art, the paint protection effect is better, but the existing metal primer and metal substrate or coated on The bonding performance of the metal paint outside the metal primer is average, and the water resistance is poor, and it is easy to cause corrosion failure after long-term use
[0003] At present, solvent-based anti-corrosion coatings are mostly used in metal anti-corrosion. General industrial anti-corrosion still uses oily alkyd paint, blending paint, thermoplastic acrylic paint, alkyd enamel and other products. The characteristics of these products are: low price, poor adhesion, anti-corrosion performance Poor, low construction technology requirements, etc. At the same time, the fatal flaws are: polluting the environment (toxic and harmful gases), poor weather resistance, no self-repair ability, and can only be used as a temporary or low anti-corrosion coating system.
[0009] The above inventions all use external anti-corrosion agents, but the anti-corrosion agents have disadvantages such as uneven dispersion, easy degradation, and easy falling off. Therefore, it is particularly important to develop a water-based anti-corrosion primer that is environmentally friendly and does not require external anti-corrosion agents.

Method used

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  • Aqueous polyurethane anticorrosive metal primer paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of polyurethane aqueous resin X containing Schiff base structure, its preparation process is as follows:

[0035] a. In a four-port reaction kettle equipped with a thermometer and an agitator, add 1.8 parts of butanediol, 2.0 parts of trimethylolpropane, 8.2 parts of polytetrahydrofuran polyol and dimethylol propionic acid in order according to the weight of the formula 2.5 parts, heat up to 90-105°C for vacuum dehydration for 1.5-2.0 hours;

[0036] b. Cool down to 65-70°C, install a condenser tube, add 10.4 parts of isophorone diisocyanate and 0.4 parts of dibutyltin dilaurate in the formula, feed nitrogen, keep warm for 1.0h, and then heat up to 80-82°C React for 2.0-2.5 hours, add 11.0 parts of acetone to adjust the viscosity, then raise the temperature to 85-88 ° C, slowly add 3.6 parts of salicylaldehyde Schiff base, add for 3-3.5 hours, then continue the heat preservation reaction for 1-1.5 hours, and detect , when the NCO value is consistent with the des...

Embodiment 2

[0039] A kind of polyurethane aqueous resin Y containing Schiff base structure, its preparation process is as follows:

[0040]a. In a four-port reaction kettle equipped with a thermometer and an agitator, add 2.2 parts of neopentyl glycol, 1.3 parts of glycerin, 10.0 parts of polyether glycol and 2.8 parts of dimethylol propionic acid in sequence according to the weight of the formula , heated to 90-105°C for vacuum dehydration for 1.5-2.0 hours;

[0041] b. Cool down to 65-70°C, install a condenser tube, add 13.5 parts of isophorone diisocyanate and 0.5 part of dibutyltin dilaurate in the formula, feed nitrogen, keep warm for 1.0h, and then heat up to 80-82°C React for 2.0-2.5 hours, add 12.0 parts of acetone to adjust the viscosity, then raise the temperature to 85-88 ° C, slowly add 4.2 parts of salicylaldehyde Schiff base, the addition time is 3-3.5 hours, and then continue the heat preservation reaction for 1-1.5 hours, Detection, when the NCO value is consistent with t...

Embodiment 3

[0044] A kind of waterborne polyurethane anticorrosion metal primer, its preparation steps are as follows:

[0045] A. According to the set weight parts, mix and stir 8.5 parts of deionized water, 0.3 parts of wetting agent, 0.8 parts of dispersant, and 0.2 parts of defoamer evenly, add 6.0 parts of fumed silica, 12.0 parts of mica powder, and use 1500 ~2000rpm high-speed stirring and dispersing for 0.5h to obtain a uniform aqueous dispersion;

[0046] B. Add 40.0 parts of polyurethane antibacterial water-based resin containing Schiff base structure X and 20.0 parts of nanometer water-based acrylic resin to the above-mentioned water-based dispersion under stirring at 600-800 rpm, and then add 3.5 parts of film-forming aids and 0.3 parts of leveling agent 0.1 part of defoaming agent, 0.2 part of thickening and anti-settling agent, 0.3 part of pH regulator, stir and disperse evenly;

[0047] C. Add 5.8 parts of deionized water and 2.0 parts of triethylamine, and stir evenly to ...

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Abstract

The invention relates to aqueous polyurethane anticorrosive metal primer paint. A basic formula of the aqueous polyurethane anticorrosive metal primer paint comprises the components in part by weight:35.0-55.0 parts of schiff base structure-containing polyurethane aqueous resin, 15.0-25.0 parts of nano aqueous acrylic resin, 10.0-30.0 parts of nanofiller, 1.5-4.0 parts of triethylamine, 4.0-10.0parts of auxiliary agent and 10.0-25.0 parts of deionized water, wherein the schiff base structure-containing polyurethane aqueous resin is prepared by reacting polyisocyanate, polyol, a salicylaldehyde schiff base, oligomer polyol, dimethylolpropionic acid, and a neutralizing agent. The aqueous polyurethane anticorrosive metal primer paint prepared by the invention combines the characteristics ofthe schiff base structure and polyurethane resin, the anticorrosive agent and the bactericide do not need to be added, the anti-corrosive effect is excellent, the primer paint can adapt to various different environments, the nano-aqueous acrylic resin and the nano-filler are added so that the anticorrosive coating have good self-repairing capability.

Description

technical field [0001] The invention relates to a water-based coating, and further relates to a water-based polyurethane anticorrosion metal primer, which belongs to the technical field of water-based functional coatings. Background technique [0002] In order to protect the metal surface and prolong the service life of the metal workpiece, the metal surface needs to be treated in the actual production process. In the prior art, the paint protection effect is better, but the existing metal primer and metal substrate or coated on The bonding performance of the metal coating outside the metal primer is average, and the water resistance is poor, and it is easy to cause corrosion failure after long-term use. [0003] At present, solvent-based anti-corrosion coatings are mostly used in metal anti-corrosion. General industrial anti-corrosion still uses oily alkyd paint, blending paint, thermoplastic acrylic paint, alkyd enamel and other products. The characteristics of these produ...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D133/00C09D5/08C09D7/61
CPCC09D5/08C09D7/61C09D175/08C08L33/00C08K3/36C08K3/34C08K3/346
Inventor 张武许钧强康伦国姚东生阳京辉
Owner SHAOGUAN HEZHONG CHEM CO LTD
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