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Method for preparing organic silicon modified epoxy electrophoretic coating emulsion

A technology of electrophoretic coating and silicone, applied in the direction of electrophoretic coating, epoxy resin coating, coating, etc., can solve the problems of poor weather resistance and achieve the effects of improving mechanical properties, good water resistance, and increasing flexibility

Active Publication Date: 2015-07-15
HAOLISEN COATING SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to improve the shortcomings of poor weather resistance of traditional epoxy electrophoretic coatings, and at the same time improve the performance of traditional epoxy electrophoretic coatings such as water resistance, impact resistance and high temperature resistance, the present invention provides a method for preparing silicone-modified epoxy electrophoretic coating emulsion, specifically It is a preparation method of silicone graft modified epoxy electrophoretic coating emulsion, wherein the silicone is used as the side chain of cationic resin

Method used

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  • Method for preparing organic silicon modified epoxy electrophoretic coating emulsion
  • Method for preparing organic silicon modified epoxy electrophoretic coating emulsion
  • Method for preparing organic silicon modified epoxy electrophoretic coating emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Preparation of silicone modified epoxy resin (EEW=1140, silicone content=15%)

[0028]

[0029]

[0030] * Prepared by the reaction of diethylenetriamine and methyl isobutyl ketone according to the molar ratio of 1:2, the solid content of the final product is: 100%

[0031] In a reaction flask equipped with a thermometer, a stirrer and a reflux condenser, sequentially add the epoxy resin, single-end-blocked bis-epoxy silicone, bisphenol A and the first part of methyl isobutyl ketone; , start stirring and raise the temperature of the reaction system to 120°C and keep it warm. After the raw materials are completely dissolved and mixed uniformly, add N,N-dimethylbenzylamine and raise the temperature to 150°C, and continue the reaction at this temperature for 1 hour. When the epoxy equivalent of the reaction system reaches the theoretical value, stop heating; when the temperature of the system drops below 90°C, add N-methylethanolamine and ketimine to the reaction ...

Embodiment 2

[0043] 1. Preparation of silicone modified epoxy resin (EEW=900, silicone content=10%)

[0044]

[0045]

[0046] In a reaction flask equipped with a thermometer, a stirrer and a reflux condenser, sequentially add the epoxy resin, single-end-blocked bis-epoxy silicone, bisphenol A and the first part of methyl isobutyl ketone; , start stirring and raise the temperature of the reaction system to 120°C and keep it warm. After the raw materials are completely dissolved and mixed uniformly, add N,N-dimethylbenzylamine and raise the temperature to 150°C, and continue the reaction at this temperature for 1 hour. When the epoxy equivalent of the reaction system reaches the theoretical value, stop heating; when the temperature of the system drops below 70°C, add triethylphosphine, 2,2-dimethylol propionic acid and deionized water into the reaction system, Raise the temperature to 80°C again, continue the reaction at this temperature for 2 hours, take samples to detect the remaini...

Embodiment 3

[0055] 1. Preparation of silicone modified epoxy resin (EEW=2000, silicone content=16%)

[0056]

[0057] In a reaction flask equipped with a thermometer, a stirrer and a reflux condenser, sequentially add the epoxy resin, single-end-blocked bis-epoxy silicone, bisphenol A and the first part of methyl isobutyl ketone; , start stirring and raise the temperature of the reaction system to 120°C and keep it warm. After the raw materials are completely dissolved and mixed uniformly, add N,N-dimethylbenzylamine and raise the temperature to 150°C, and continue the reaction at this temperature for 3 hours. When the epoxy equivalent of the reaction system reaches the theoretical value, stop heating; when the system temperature drops below 70°C, add diphenyl sulfide and butyric acid to the reaction system, raise the temperature to 80°C again, and continue at this temperature React for 2 hours, take a sample to detect the remaining acid value of the reaction system (the initial theore...

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Abstract

The invention discloses a method for preparing organic silicon modified epoxy electrophoretic coating emulsion. The organic silicon serves as a side chain of a cationic resin. The preparation process of the electrophoretic coating emulsion comprises the following steps: performing a stepwise polymerization reaction on an epoxy resin, a single-blocking bisepoxy organic silicon and a chain extender, thus obtaining an organic silicon grafting modified epoxy resin; ionizing an organic amine compound (or an organic phosphorus compound and an organic sulfur compound) with organic acid, adding a totally closed isocyanate crosslinking agent, and finally, emulsifying and dispersing to prepare the organic silicon modified epoxy electrophoretic coating emulsion which takes the organic silicon as the side chain of the cationic resin in an aqueous medium. The organic silicon is introduced into the epoxy resin through a chemical reaction, so that the coating has high water resistance, weather resistance, high-temperature resistance and ultraviolet light resistance; and due to the addition of the organic silicon, the glass transition temperature of the modified epoxy resin is reduced, and the flexibility of the resin is improved, so that the mechanical property of the coating is improved.

Description

[technical field] [0001] The invention discloses a method for preparing an organosilicon-modified epoxy electrophoretic paint emulsion, specifically a method for preparing an organosilicon graft modified epoxy electrophoretic paint emulsion, wherein the organosilicon is used as a cationic resin side chain. [Background technique] [0002] Since the 1970s, cathodic electrophoretic coatings have been used more and more in many industries due to their own advantages. Because epoxy resin has the advantages of excellent mechanical properties, electrical properties, chemical corrosion resistance, bonding performance, easy processing and low cost, etc., the resin used in traditional electrophoretic coatings often chooses epoxy resin, but due to the toughness of epoxy resin Poor, high surface energy, easy degradation at high temperature, and insufficient hydrophobicity make epoxy resins only suitable for primers. With the continuous development and progress of electrophoretic coati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/14C09D163/00C09D5/44C09D7/12
Inventor 周贤张萌刘薇薇郭辉史动李书谱康佳
Owner HAOLISEN COATING SHANGHAI