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Organic montmorillonite modified polyurethane acrylic electrophoretic resin and electrophoretic paint

A technology of organic montmorillonite and polyurethane resin, which is applied in the field of coatings, can solve the problems of shrinkage, air bubbles, and impact on the coating surface, and achieve the effects of improving bonding strength, high industrial value, and low cost

Active Publication Date: 2015-11-18
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current cathodic electrophoretic coating is often affected by various adverse factors, causing defects such as shrinkage cavities, impurities, air bubbles, and pinholes on the coating surface, which seriously affects its practical application and production.

Method used

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  • Organic montmorillonite modified polyurethane acrylic electrophoretic resin and electrophoretic paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 18.29g of N-methyldiethanolamine and 1.25g of trimethylolpropane, carry out dehydration treatment at 100°C for 1h, in the presence of solvent 1,4-dioxane, then add 21.55g of isocyanate dropwise at 30°C After reacting for 4 hours, 9.24 g of glacial acetic acid was added dropwise to carry out neutralization reaction for 1 hour, and finally a hydroxyl-terminated cationic polyurethane was obtained.

[0039] Then take 60g of the above-mentioned hydroxyl-terminated cationic polyurethane, disperse it with an appropriate amount of water, then take 12g of sodium-based montmorillonite and add a certain amount of deionized water to disperse, heat at 80°C for 1h, and add the above-mentioned montmorillonite dispersion liquid dropwise to the polyurethane emulsion At the same time, shake in ultrasonic for 4h. Then it was filtered and washed with suction, and then dried in vacuum for 6 hours at a temperature of 100°C. The product was then ground to 320 mesh.

[0040] Take 9.27g ...

Embodiment 2

[0044]Take 20g of N-methyldiethanolamine and 1.2g of trimethylolpropane, dehydrate at 100°C for 1h, in the presence of the solvent 1,4-dioxane, then add 21.55g of isocyanate dropwise and react at 30°C After 4 hours, 10.05 g of glacial acetic acid was added dropwise to carry out neutralization reaction for 1 hour, and finally a hydroxyl-terminated cationic polyurethane was obtained.

[0045] Then take 60g of the above-mentioned hydroxyl-terminated cationic polyurethane, disperse it with an appropriate amount of water, then take 12g of sodium-based montmorillonite and add a certain amount of deionized water to disperse, heat at 80°C for 1h, and add the above-mentioned montmorillonite dispersion liquid dropwise to the polyurethane emulsion At the same time, shake in ultrasonic for 4h. Then it was filtered and washed with suction, and then dried in vacuum for 6 hours at a temperature of 100°C. The product was then ground to 320 mesh.

[0046] Take 18.53g of polyol ether with a m...

Embodiment 3

[0050] Take 18.43g of N-methyldiethanolamine and 1.15g of trimethylolpropane, carry out dehydration treatment at 100°C for 1h, in the presence of solvent 1,4-dioxane, then drop 21.55g of isocyanate at 30°C After reacting for 4 hours, 9.27 g of glacial acetic acid was added dropwise to carry out neutralization reaction for 1 hour, and finally a hydroxyl-terminated cationic polyurethane was obtained.

[0051] Then take 60g of the above-mentioned hydroxyl-terminated cationic polyurethane, disperse it with an appropriate amount of water, then take 12g of sodium-based montmorillonite and add a certain amount of deionized water to disperse, heat at 80°C for 1h, and add the above-mentioned montmorillonite dispersion liquid dropwise to the polyurethane emulsion At the same time, shake in ultrasonic for 4h. Then it was filtered and washed with suction, and then dried in vacuum for 6 hours at a temperature of 100°C. The product was then ground to 320 mesh.

[0052] Take 9.27g of polyo...

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Abstract

The invention relates to the field of paint, in particular to an organic montmorillonite modified polyurethane acrylic electrophoretic resin and electrophoretic paint. Hydroxy-terminated cation waterborne polyurethane resin is prepared, and is in exchange reaction with Na-montmorillonite cation to obtain organic montmorillonite, the generated organic montmorillonite and polyether polyol are in melt intercalation, and then are in step-by-step polymerization reaction with isocyanate and a chain extender, generated polymer macromolecules effectively enlarge the interlayer spacing of the montmorillonite, and is in a nanoscale disperse state in polymer substrate, and after the reaction is finished, acid is added to neutralize nitrogen atoms on a polyurethane molecule main chain to generate ammonium ions so as to obtain the polyurethane nano hybrid resin. The prepared polyurethane nano hybrid resin is mixed with terminal blocked type HDI tripolymer, the mixture is subjected to strong shearing and emulsification to be dispersed in water so as to obtain the water-based polyurethane electrophoretic paint; the water-based polyurethane electrophoretic paint is formed into film through an electrophoretic process. The brightness fullness of the electrophoretic paint is greater than 90, the hardness is greater than 4H, the water resistance is greater than 1,000 h, and the acid resistance is greater than 30 h.

Description

technical field [0001] The invention relates to the field of coatings, in particular to an organic montmorillonite modified polyurethane electrophoretic resin and an electrophoretic paint. Background technique [0002] With the enhancement of human environmental protection awareness, solvent-based coatings are gradually restricted, and the development of coatings that meet environmental protection requirements is the general trend. Water-based and solvent-free coatings are the future development direction. However, the residual emulsifier in water-based coatings has a great influence on the anti-corrosion performance of the paint film, and solvent-free epoxy coatings have obvious advantages as heavy-duty anti-corrosion applications. [0003] In recent years, the emergence of nanomaterials and the development of nanotechnology have provided a new way for the modification of polymers. Inorganic nanomaterials have been more and more used in the research of polymer modification...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/44C09D7/12C08G18/65C08G18/32C08G18/58C08G18/64C08K9/04C08K3/34
Inventor 李再峰李再亮李翠苹李再胜
Owner QINGDAO UNIV OF SCI & TECH
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