Emulsion for cathodic electrophoretic paint and preparation method thereof, cathodic electrophoretic paint and preparation method thereof

A cathodic electrophoretic paint and emulsion technology, which is applied in the field of paint, can solve the problems of low reaction efficiency between alcohol hydroxyl groups and epoxy groups, high charge density of cathodic electrophoretic paint, and further improvement in throwing power, so as to achieve a smooth and smooth appearance of the paint film. Easy to operate on a large scale and improve the effect of throwing power

Active Publication Date: 2021-09-03
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] People such as Cai Haopeng adopt polyester and polyether glycol to directly modify epoxy resin (Cai Haopeng, Wang Jun, Sun Lanlan, research on hydroxyl-terminated polyether modified epoxy resin [J], Colloid and Polymer, 2007,25(1 ):25-27), but the reaction efficiency of alcohol hydroxyl group and epoxy group is low, and the grafting efficiency is poor
Jin Ke and others adopt the reaction of acid anhydride and polyol to produce carboxyl group, and the method of carboxyl group reacting with epoxy resin to generate epoxy ester is modified to epoxy (Jin Ke, Liu Lizhu, Zhang Xiaorui, etc., straight-chain carboxyl-terminated polyester amide Resin toughening modified epoxy resin[J], Polymer Materials Science and Engineering, 2015,31(7):17-21), this modification has better toughening effect, but the corrosion resistance of epoxy ester The effect has been affected
[0005] The Chinese invention patent with the application publication number CN103342943A discloses a method for preparing a high-charge-density cathodic electrophoretic coating, which includes the following steps: taking epoxy resin, carboxyl-terminated cationic polyurethane resin, chain extender and organic amine compound as raw materials, through Stepwise polymerization and ring-opening reaction to obtain aminated cationic polyurethane modified epoxy resin, the resin is then blended with a fully blocked isocyanate crosslinking agent, and after blending, an organic acid is added for neutralization; finally, it is emulsified and dispersed in an aqueous medium A cathodic electrophoretic coating with high charge density is obtained. The cathodic electrophoretic coating obtained by using the preparation method disclosed in this patent has a high charge density, but its throwing power still needs to be further improved

Method used

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  • Emulsion for cathodic electrophoretic paint and preparation method thereof, cathodic electrophoretic paint and preparation method thereof
  • Emulsion for cathodic electrophoretic paint and preparation method thereof, cathodic electrophoretic paint and preparation method thereof
  • Emulsion for cathodic electrophoretic paint and preparation method thereof, cathodic electrophoretic paint and preparation method thereof

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Effect test

Embodiment 1

[0058] The preparation method of the cathodic electrophoretic coating emulsion of the present embodiment, such as figure 1 shown, including the following steps:

[0059] 1) Preparation of chain extender

[0060]

[0061] Drop into 360 parts of bisphenol A type polyoxyethylene ether (average molecular weight 450), 106 parts of thiolactic acid, 160 parts of di Toluene, control the speed of the stirring device to 400rpm, heat to 100°C; after mixing evenly, add 0.5 parts of dibutyltin oxide catalyst, 0.5 parts of SO 4 2- / TiO 2 Solid super acid catalyst, heat up to 160°C and start to reflux, continue to heat up to 170°C, and keep it at 170°C for 7 hours; cool down to 160°C and feed nitrogen to remove the remaining xylene, keep it at 160°C for 1 hour, and then continue Feed nitrogen to cool down. When the temperature drops below 140°C, stop feeding nitrogen and continue to cool down. When the acid value is less than 10mgKOH / g, the reaction is complete and the chain extender ...

Embodiment 2

[0079] The preparation method of the cathodic electrophoretic coating emulsion of the present embodiment may further comprise the steps:

[0080] 1) Drop into 530 parts of polycaprolactone glycol (PCL-205), 284 parts of 3-mercaptoisobutyric acid, 150 parts of xylene, control the speed of the stirring device at 600rpm, heat to 100°C; after mixing evenly, add 0.5 parts of tetraphenyltin catalyst and 0.5 parts of SO 4 2- / ZrO 2 Solid super acid catalyst, heat up to 170°C and start to reflux, continue to heat up to 200°C, and keep it at 200°C for 8 hours; cool down to 150°C and feed nitrogen to remove the remaining xylene, keep it at 150°C for 2 hours, and then continue Feed nitrogen to cool down. When the temperature drops below 140°C, stop feeding nitrogen and continue to cool down. When the acid value is less than 10mgKOH / g, the reaction is complete and the chain extender is obtained;

[0081] 2) Under nitrogen protection, put 203 parts of chain extender and 475 parts of epo...

Embodiment 3

[0088] The preparation method of the cathodic electrophoretic coating emulsion of the present embodiment may further comprise the steps:

[0089] 1) Drop into 850 parts of polytetrahydrofuran diol (average molecular weight 850), 310 parts of 2-mercaptonicotinic acid, 150 parts of dimethylformin in the reactor with heating and stirring device, water separating device, condensation reflux device and inert gas protection device Dibutyltin dilaurate catalyst and 0.5 part of SO 4 2- / Fe 2 o 3 Solid superacid catalyst, heat up to 170°C and start reflux, continue to heat up to 190°C, keep at 190°C for 7 hours; cool down to 160°C, blow nitrogen to remove the remaining dimethylformamide, and keep at 160°C for 1 hour , and then continue to feed nitrogen to cool down. When the temperature drops below 140°C, stop feeding nitrogen and continue to cool down. When the acid value is less than 10mgKOH / g, the reaction is complete and a chain extender is obtained;

[0090] 2) Under the prote...

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Abstract

The invention relates to an emulsion for cathodic electrophoretic paint and a preparation method thereof, cathodic electrophoretic paint and a preparation method thereof, and belongs to the technical field of paint. In the preparation method of the present invention, a mercapto compound is reacted with a polyol at 160-200°C, and then an inert gas is introduced and kept at 150-160°C for 1-2 hours to obtain a chain extender; the chain extender and epoxy resin are mixed in Add tertiary amine catalyst after 100-110°C and keep warm at 130-140°C for 0.5-1h, then keep warm at 90-100°C for 1-2h to obtain modified resin; mix modified resin with alcohol ether solvent and add organic amine , and keep warm at 100-120°C for 2-4h, then add cross-linking agent and mix at 70-110°C for 1-2h, then add acid and mix at 80-90°C for 1-2h to obtain product A, mix well with water have to. The emulsion obtained by the invention significantly improves the throwing power of the cathodic electrophoretic paint.

Description

technical field [0001] The invention relates to an emulsion for cathodic electrophoretic paint and a preparation method thereof, cathodic electrophoretic paint and a preparation method thereof, and belongs to the technical field of paint. Background technique [0002] Electrophoretic coatings usually refer to a water-based coating in which the film-forming substances in the coating are deposited on the substrate under the action of an electric field, and finally baked to form a film. After decades of development, electrophoretic coatings have become more and more important in the coatings industry, which is mainly due to the high utilization rate of coatings, strong corrosion resistance, and good environmental performance. [0003] The automotive industry is one of the most important application fields of cathodic electrophoretic coatings, and cathodic electrophoretic coatings used in this field usually use epoxy resin as the main resin. The hydroxyl groups on the epoxy res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D5/44C09D7/61C08G59/66
CPCC08G59/66C09D5/4442C09D5/4453C09D5/4457C09D163/00C08K3/04
Inventor 胡东波陈卫东方基祥李涛陈兴兰孙家娣
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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