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Pigment dispersion resin for cathode electrophoresis paint and its pigment paste

A cathodic electrophoretic coating and pigment dispersion technology, applied in the direction of electrophoretic coatings, etc., can solve the problems of increasing the load of coating equipment, poor storage stability of the bath solution, and difficulty in fully reacting, etc., to achieve increased wet film resistance, excellent permeability, and improved electrophoresis. Penetration effect

Active Publication Date: 2004-05-05
CNOOC CHANGZHOU EP COATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this pigment dispersing resin has improved the dispersing performance of the pigment, when the semi-blocked aromatic diisocyanate reacts with the tertiary amine aminating agent containing -OH, it is difficult to fully react at a lower temperature, and it is difficult to fully react at a higher temperature. Temperature, the tertiary amino group in the tertiary amine aminating agent containing -OH, and the catalytic self-polymerization reaction of isocyanate, so the quality and performance are difficult to be stable and consistent
Therefore, the storage period of the pigment slurry made of this pigment dispersion resin is still relatively short. After the pigment slurry is formulated with the resin emulsion of cathodic electrophoretic coating into the electrophoretic bath, precipitation is easy to form, and the storage stability of the bath is relatively low. Poor, which in turn increases the load on the coating equipment

Method used

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  • Pigment dispersion resin for cathode electrophoresis paint and its pigment paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] components

[0020] In a dry and clean reaction kettle equipped with a thermometer, agitator, reflux condenser and high level tank, etc., add 2,4-toluene diisocyanate and butanone, add isooctyl alcohol and dimethylaminoethanol dropwise, and control the temperature at 35 ~50°C, after the dropwise addition, keep warm at about 50°C for 2 hours, add diethylaminopropylamine dropwise after the heat preservation, control the temperature at 35~50°C, after the dropwise addition, raise the temperature to 80~90°C for 2.5 hours, keep warm After the end, add ethylene glycol monobutyl ether and lower the temperature to 75°C, add acetic acid solution, stir evenly, then cool down and discharge the material, which is the quaternizing agent A and set aside.

[0021] components

[0022] Add ethylene glycol monobutyl ether into a dry and clean reaction kettle equipped with a thermometer, agitator, reflux condenser, and high-level tank, raise the temperature to 80°C, ad...

Embodiment 2

[0024] components

[0025] Except that the above-mentioned raw materials and dosages were used instead, all the others were prepared according to the conditions of Example 1 to prepare quaternizing agent B for future use.

[0026] components

[0027] Except that the above-mentioned raw materials and dosages were used instead, the conditions of Example 1 were followed to prepare pigment dispersion resin B with a solid content of 60.0%.

Embodiment 3

[0029] components

[0030] Except that the above-mentioned raw materials and dosage were used instead, all the others were prepared according to the conditions of Example 1 to prepare quaternizing agent C for future use.

[0031] components

[0032] Except that the above-mentioned raw materials and dosages were used instead, the conditions of Example 1 were followed to prepare pigment dispersion resin C with a solid content of 60.0%.

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Abstract

A pigment dispersed resin for cathode electrophoretic paint is a cationic resin containing urea group and quaternary ammonium salt group and prepared by reaction between quaternary aminating agent and epoxy resin. Saaid quaternary aminating agent is prepared from aromatic polyisocyanate, alcohol and / or ether, and primary amine through addition and neutralizing by organic acid. Said epoxy resin is the biphenol A or F and glycide ether type one. A pigment slurry is prepared from said pigment dispersed resin, conventional pigment, catalyst and deionized water.

Description

technical field [0001] The invention relates to a pigment dispersion resin for cathodic electrophoretic paint and its pigment paste. Background technique [0002] Cathodic electrophoretic coating is a new type of anti-corrosion coating developed in the mid-1970s and quickly obtained industrial application. With the continuous development of technology and the continuous expansion of application fields, cathodic electrophoretic coatings are no longer limited to pure anti-corrosion functions, but also take into account the decorative functions of materials. Cathodic electrophoretic coatings with decorative functions, such as transparent paints and color paints of various colors, must contain pigments (including coloring pigments and extender pigments). Therefore, the dispersibility of pigments in cathodic electrophoretic coatings and their baths is particularly important. Usually, the pigment is dispersed or ground into the pigment dispersing resin to make a pigment slurry f...

Claims

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Application Information

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IPC IPC(8): C09D5/44
Inventor 方基祥熊挽志陈卫东缪蕾
Owner CNOOC CHANGZHOU EP COATING
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