Ionic curing agent and preparation method thereof

A curing agent and ionic technology, which is applied in the field of preparation of ionic curing agent, can solve the problems affecting the final performance of electrophoretic coatings, and achieve the effects of easy process control, difficult precipitation and stratification, and reduced heat release

Active Publication Date: 2016-01-20
HAOLISEN COATING SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once scaled up to industrial production, these side reactions will inevitably bring many negative problems to the production process of the curing agent and the performance of the final product, and will also affect the final performance of the electrophoretic coating

Method used

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  • Ionic curing agent and preparation method thereof
  • Ionic curing agent and preparation method thereof
  • Ionic curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Component A (the molar ratio of epoxy group, polyhydroxy sulfide and monobasic organic acid in polyepoxide is 1:1:1)

[0032] In a 500 mL three-neck flask equipped with a stirrer and a thermometer, 101 g of butanediol diglycidyl ether (epoxy equivalent weight: 101), 122 g of bis(2-hydroxyethyl) sulfide and 60 g of acetic acid were successively added. Start stirring after the addition is complete. When the reaction system is evenly stirred, the temperature of the reaction system is raised to 80°C. During the heating process, there is an obvious exothermic phenomenon. The reaction system was maintained at 80°C for 1 hour, and the residual acid value of the reaction system was detected by sampling (initial theoretical acid value of the reaction system: 198 mgKOH / g). When the acid value was less than 10, the reaction was stopped.

[0033] Component B (the molar ratio of isocyanate group in polyisocyanate to compound containing active hydrogen: 1:0.5)

[0034] 522 g of tolu...

Embodiment 2

[0041] Component A (the molar ratio of epoxy group, polyhydroxy sulfide and monobasic organic acid in polyepoxide is 1:1.5:1)

[0042] In a 500 mL three-necked flask equipped with a stirrer and a thermometer, 101 g of butanediol diglycidyl ether (epoxy equivalent weight: 101), 183 g of bis(2-hydroxyethyl) sulfide and 60 g of acetic acid were sequentially added. Start stirring after the addition is complete. When the reaction system is evenly stirred, the temperature of the reaction system is raised to 80°C. During the heating process, there is an obvious exothermic phenomenon. The reaction system was maintained at 80°C for 1 hour, and the residual acid value of the reaction system was detected by sampling (initial theoretical acid value of the reaction system: 163 mgKOH / g). When the acid value was less than 8, the reaction was stopped.

[0043] Component B (the molar ratio of isocyanate group in polyisocyanate to compound containing active hydrogen: 1:0.65)

[0044] Add 522 g...

Embodiment 3

[0048] Change the polyepoxy compound in the component A of Example 1 into trimethylolpropane triglycidyl ether, and the polyhydroxy sulfide into 4-(3-hydroxypropylthio)-1-butanol, monobasic organic The acid is changed to butyric acid, the reaction temperature is changed to 60°C, and the reaction time is changed to 3h; the polyisocyanate in component B of Example 1 is changed to isophorone diisocyanate, and the compound containing active hydrogen is changed to ethylene glycol mono Butyl ether, the reaction temperature was changed to 50°C, and the reaction time was changed to 5h; the molar ratio of the hydroxyl group in component A and the isocyanate group in component B in Example 1 was changed to 1:0.7, and the reaction temperature was changed to 50°C, The reaction time was changed to 2 hours, and other reaction conditions were as described in Example 1, and finally an ionic curing agent different from Example 1 was obtained.

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Abstract

The invention relates to an ionic curing agent and a preparation method thereof. The general formula (I) of the ionic curing agent is as shown in the specification; the ionic curing agent obtains an ionic structure through polyhydroxy sulfide and avoids the application of traditional compounds containing tertiary nitrogen atoms; the ionic curing agent is free of the tertiary nitrogen atoms in the molecules, thereby reducing the unfavorable factors of violent heat release and increased side reactions in the preparation process of the ionic curing agent, ensuring easier process control and facilitating industrial production; and the curing agent is cationic, thereby capable of being compatible to a traditional cationic electrophoretic coating; the curing agent carries charges per se, thereby capable of being dispersed into water without assistance of cation exchange resin and greatly improving the stability of liquid in an electrophoresis bath; and furthermore, the curing agent is unlikely to precipitate or stratify.

Description

[technical field] [0001] The invention relates to an ionic curing agent and a preparation method thereof, in particular to a preparation method of an ionic curing agent which is positively charged, capable of electrophoresis, and does not contain tertiary nitrogen atoms. [Background technique] [0002] Cationic electrophoretic coating is a kind of coating developed for electrophoretic coating process. It is mainly composed of cationic resin, with appropriate amount of co-solvent, curing agent, pigment and other components, and obtained by self-emulsification with water as solvent. At present, most of the most commonly used curing agents for electrophoretic coatings are water-insoluble blocked isocyanates. The process of introducing them into electrophoretic coatings usually adopts the method of mechanical blending, that is, the curing agent and ionic resin are physically mixed by stirring or dispersing. When the mixed product is dispersed in water, the non-water-soluble curi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/78C08G18/32C08G18/58C08G59/14C09D5/44
Inventor 周贤张萌刘薇薇郭辉史动李书谱康佳
Owner HAOLISEN COATING SHANGHAI
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