Preparation and application methods of water-resistant polyurethane coating material

A polyurethane coating and coating material technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor water absorption, improve hardness and adhesion, and improve water absorption.

Inactive Publication Date: 2019-08-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the disadvantage of poor water absorption of polyurethane itself, the present invention proposes a preparation method of maleic anhydride polybutadiene and its derivatives modified polyurethane composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 14.5g of polyurethane whose main component is isocyanate in a beaker, add 5g of diluent to dissolve and stir evenly. Take 2g of curing agent in a beaker, add 2.5g of diluent to dissolve and stir evenly. Add the curing agent solution dropwise to the isocyanate and stir thoroughly for 10 minutes. Take 0.15g of maleic anhydride polybutadiene and add 1.5g of diluent to dissolve it, then add it dropwise into the isocyanate solution, and stir for 20 minutes. The liquid was brushed on carbon steel and left at room temperature for 2 days to obtain a coating with a thickness of 20 microns. The hardness of the coating is 4H, the water absorption rate is 0.94%, soaked in 3.5% NaCl solution for 5 days, the impedance value is 10 5 , The salt spray test time can reach 792 hours.

Embodiment 2

[0023] Take 14.5g of polyurethane whose main component is isocyanate in a beaker, add 5g of diluent to dissolve and stir evenly. Take 2g of curing agent in a beaker, add 2.5g of diluent to dissolve and stir evenly. Add the curing agent solution dropwise to the isocyanate and stir thoroughly for 10 minutes. Take 1.6g of maleic anhydride polybutadiene and add 1.5g of diluent to dissolve it, then add it dropwise into the isocyanate solution, and stir for 20 minutes. The liquid was brushed on carbon steel and left at room temperature for 2 days to obtain a coating with a thickness of 20 microns. The hardness of the coating is 4H, the water absorption rate is 1.51%, soaked in 3.5% NaCl solution for 5 days, the impedance value is 10 4 , The salt spray test time can reach 720 hours.

Embodiment 3

[0025] Take 14.5g of polyurethane whose main component is isocyanate in a beaker, add 5g of diluent to dissolve and stir evenly. Take 2g of curing agent in a beaker, add 2.5g of diluent to dissolve and stir evenly. Add the curing agent solution dropwise to the isocyanate and stir thoroughly for 10 minutes. Take 0.15g of monoaminated maleic anhydride polybutadiene and add 1.5g of diluent to dissolve it, then add it dropwise into the isocyanate solution and stir for 20 minutes. The liquid was brushed on carbon steel and left at room temperature for 2 days to obtain a coating with a thickness of 20 microns. The hardness of the coating is 4H, the water absorption rate is 1.42%, soaked in 3.5% NaCl solution for 5 days, the impedance value is 10 6 , The salt spray test time can reach 816 hours.

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Abstract

The invention belongs to the field of modified polyurethane in chemical engineering and relates to preparation and application methods of a water-resistant polyurethane coating material. During preparation, firstly, polyurethane, a diluent and a curing agent are added, polyurethane is dissolved in the diluent, and a polyurethane solution is prepared; maleic anhydride polybutadiene or a derivativeof maleic anhydride polybutadiene is added, and a polyurethane coating solution is obtained. In the polyurethane coating solution, the concentration of the maleic anhydride polybutadiene or the derivative of maleic anhydride polybutadiene is 30%-70%, and the acid value is 50-215 mg / gKOH. During application, the prepared polyurethane coating solution is applied to the surface of a matrix through brush coating. The coating can realize surface drying at 35 DEG C for 30 min and can be completely dried within 2 d. The corrosion resistance, hardness and adhesion of the coating are improved while thewater absorption of the coating is improved.

Description

technical field [0001] The invention relates to the technical field of modified polyurethane in chemical engineering, and to a preparation method of organic synthesis reaction. Background technique [0002] Polyurethane coatings have excellent wear resistance and oil resistance, strong adhesion, excellent low-temperature curing performance, high decoration, performance diversity and adjustability, and can be widely used in the fields of metal anti-corrosion protection and decoration. However, it is toxic, odorous, flammable, and easy to cause air pollution, and its water resistance is poorer than epoxy resin, which limits its application. Therefore, people modify polyurethane by different methods to improve the comprehensive performance of polyurethane. [0003] For example, in the publication number CN108676481A, it is proposed that the beans are crushed into slurry and added to the polyurethane coating, so that the water resistance of the coating, the mechanical properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D135/00C09D147/00C09D7/65
CPCC09D7/65C09D175/04C08L35/00C08L47/00
Inventor 王金伟刘江涛张达威
Owner UNIV OF SCI & TECH BEIJING
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