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Modified epoxy resin, preparation method thereof, and prepared electrophoretic coating

A technology of epoxy resin and electrophoretic coating, which is applied in the field of coatings. It can solve the problems that the range of application and performance of electrophoretic coatings cannot meet the quality requirements of coating products, affect the anti-corrosion performance of electrophoretic coatings, and poor ability of uniform paint film, etc., and achieve product appearance. And anti-corrosion performance improvement, excellent anti-aging performance, high throwing power effect

Active Publication Date: 2020-05-08
KEDE CHEM IND SHUNDE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the continuous progress of society, the scope and performance of current electrophoretic coatings can no longer meet the higher quality requirements of painted products.
For example, the existing electrophoretic coatings have insufficient throwing power, poor uniform paint film ability on the surface of the object to be coated, and the paint film surface may be rough and wrinkled on the part where the paint film is too thick, and even sagging after baking in severe cases. Phenomenon, and seriously affect the anti-corrosion performance of electrophoretic coatings

Method used

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  • Modified epoxy resin, preparation method thereof, and prepared electrophoretic coating
  • Modified epoxy resin, preparation method thereof, and prepared electrophoretic coating
  • Modified epoxy resin, preparation method thereof, and prepared electrophoretic coating

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The preparation method that the modified epoxy resin of embodiment 1 adopts comprises the steps:

[0053] Add epoxy resin, organic phosphorus containing phosphorus and oxygen double bonds, acid and 120g deionized water into a removable flask equipped with a stirrer, thermometer, nitrogen conduit and reflux condenser, heat up to 75°C, and react for 5h. After the acid value was determined to be no more than 5, 140 g of deionized water was added, and the solid content was determined to be 70.2%, to obtain the modified epoxy resin aqueous solution.

[0054] The preparation method that the modified epoxy resin of embodiment 2-5 adopts comprises the steps:

[0055] Add epoxy resin and carbon-carbon unsaturated bond compound to a detachable flask equipped with a stirrer, thermometer, nitrogen conduit and reflux condenser, heat the mixture to 130°C, and react for 3h. After the acid value dropped to 0, the mixture was cooled to 80°C, and organic phosphorus containing phosphorus...

Embodiment 6

[0056] The preparation method that the modified epoxy resin of embodiment 6 adopts comprises the steps:

[0057] Add epoxy resin and carbon-carbon unsaturated bond compound to a removable flask equipped with a stirrer, thermometer, nitrogen conduit and reflux condenser, heat the mixture to 110°C, and react for 6h. After the acid value dropped to 0, the mixture was cooled to 60°C, and organic phosphorus containing phosphorus-oxygen double bonds, acid and 400g deionized water were added, and reacted for 10h. After the acid value was determined to be no more than 5, 300 g of deionized water was added to make the solid content 73%, so as to obtain the modified epoxy resin aqueous solution.

Embodiment 7

[0058] The preparation method that the modified epoxy resin of embodiment 7 adopts comprises the steps:

[0059] Add epoxy resin and carbon-carbon unsaturated bond compound to a removable flask equipped with a stirrer, thermometer, nitrogen conduit and reflux condenser, heat the mixture to 150°C, and react for 1 h. After the acid value was determined to drop to 0, the mixture was cooled to 90°C, and organic phosphorus containing phosphorus-oxygen double bonds, acid and 260 g of deionized water were added and reacted for 3 hours. After the acid value was determined to be no more than 5, 270 g of deionized water was added to make the solid content 70% to obtain the modified epoxy resin aqueous solution.

[0060] The physical and chemical indicators of the modified epoxy resin provided in the above examples were tested, and the results are shown in Table 2.

[0061] The physical and chemical properties of the modified epoxy resin of table 2 embodiment of the present invention 1-...

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Abstract

The invention relates to the technical field of coatings, in particular to a modified epoxy resin, a preparation method thereof, and an electrophoretic coating prepared. The molecular chain of the modified epoxy resin includes phosphorus groups. The phosphorus base has a tertiary ion state, and the ionization constant of each ion is different. The tertiary ion state of the phosphorus base can promote the step-by-step sedimentation of the paint film during the electrophoretic deposition of the electrophoretic coating prepared as a base resin, and the paint film density is uniform. Good stability and accumulation shape, so that the appearance and anti-corrosion performance of the prepared product are greatly improved. And the dispersion of phosphorus-based hydrated ions in the emulsion state is more stable. Phosphorus-based groups are introduced into the epoxy resin as the base resin of the electrophoretic coating. When the phosphorus-based group is electrolytically reduced, the ionic group disappears to form a phosphide and becomes an insulator, which effectively improves the electrophoretic coating's throwing power.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a modified epoxy resin, a preparation method thereof, and an electrophoretic coating prepared. Background technique [0002] Electrophoretic coating has high coating utilization rate, easy to realize coating automation, low content of volatile organic compounds and harmful air pollutants, and little environmental pollution. Moreover, electrophoretic coatings have excellent corrosion resistance, high penetration rate, high leveling, and high decorative properties. They are widely used in the motor vehicle industry, and are widely used in building materials, light industry, household appliances and other industrial fields, as well as hardware and handicrafts. Surface anti-corrosion and decoration. [0003] However, with the continuous progress of society, the scope and performance of current electrophoretic coatings can no longer meet the higher quality requirements of painted pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/14C08G59/17C08G59/16C09D163/00C09D163/10C09D5/44
CPCC08G59/1444C08G59/1455C08G59/1466C08G59/1488C09D5/4434C09D5/4442
Inventor 李文庄严卓华高睿邓仲明
Owner KEDE CHEM IND SHUNDE