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Preparation method of environment-friendly cataphoresis coating emulsion and using method thereof

A cationic electrophoresis and cathodic electrophoresis coating technology, applied in electrophoretic coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of energy saving, time saving without obvious improvement, unenvironmental manufacturing, and time increase, etc., and achieve excellent flexibility. Flexibility, system viscosity reduction, low viscosity effect

Active Publication Date: 2019-08-13
浙江铭孚金属涂装科技有限公司
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  • Abstract
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Problems solved by technology

[0011] Chinese patent CN109021809A discloses a kind of environment-friendly cationic electrophoresis water-based resin and its preparation method and application. Although a manufacturing process different from the prior art is proposed, the dripping time of epoxy resin is as long as more than 6 hours, and there is another period after that. The reflux reaction time is as high as more than 9 hours. Although the reaction temperature is much lower than the existing technology, the time is increased by several hours, and there is no obvious improvement in energy saving and time saving.
[0012] Therefore, although electrophoretic coatings are the leader in water-based coatings, there are still some unenvironmental and energy-saving processes in their manufacturing.

Method used

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  • Preparation method of environment-friendly cataphoresis coating emulsion and using method thereof
  • Preparation method of environment-friendly cataphoresis coating emulsion and using method thereof

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preparation example Construction

[0032] A preparation method of an environment-friendly cationic electrophoretic paint emulsion, comprising the steps of:

[0033] (1). The ring-opening reaction between polyether amine and the epoxy functional group at the end of the epoxy resin to obtain the modified epoxy resin with terminal amino group polyether amine: add polyether amine to the reactor, stir and heat up to 70- 90°C, after the temperature reaches, add epoxy resin in batches, the molar ratio of polyetheramine to epoxy resin is 2.0-2.2:1.0; when all the epoxy resin is added, keep warm at 90-100°C for 1-2 hours , during the period with Fourier transform infrared spectrometer (FTIR) identification until the epoxy functional group absorption peak disappears completely; Obtain the polyetheramine modified epoxy resin of solvent-free solid content 100%; The polyetheramine of described == is molecular weight at 230- Polyether amine compounds between 4000. More preferred is a diamine polyetheramine compound with a m...

Embodiment 1-a

87.42

[0047] Note 1 Polyetheramine, Arcoli Company; Note 2 Epoxy Resin, Nan Ya Plastic Company

[0048] Add polyetheramine MA-2000 into a 1L separate glass reaction vessel equipped with a stirrer, reflux condenser and temperature controller, stir and raise the temperature to 90°C. After the temperature is reached, add epoxy resin NPES-301 in batches. When all the epoxy resin is added and mixed evenly, keep warm at 90°C for 1-2 hours. During this period, use Fourier transform infrared spectrometer (FTIR) to identify the absorption peak of epoxy functional group , until the epoxy absorption peak disappears completely. A solvent-free polyetheramine-modified epoxy resin (1-a) was prepared.

Embodiment 1-b

87.42

[0051] Note 3 Polyetheramine, Huntsman Company; Note 4 Epoxy Resin, Changchun Resin Company

[0052]Reaction steps are identical with embodiment 1-a. A solvent-free polyetheramine-modified epoxy resin (1-b) was prepared.

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Abstract

The invention relates to a preparation method of an environment-friendly cataphoresis coating emulsion and a using method thereof. In the technology, solid bisphenol A type epoxy resin is adopted as the backbone, high molecular weight polyether amine is adopted for performing a loop opening lamination reaction on an epoxy functional group, and closed polyisocyanate is adopted as a curing agent. When the agent is dispersed into pure water, the cataphoresis coating emulsion can be obtained. The electrophoretic paint is used for performing electrophoresis on a phosphorization cold rolling steel plate for coating of a film, after thermocuring is performed, the thickness of the paint film is 18-20 micrometers, and the neutral slat fog can reach 1,000 h or longer; in addition, different from traditional preparation technologies, the preparation technology has the advantages of saving energy, reducing waste and shortening work hours.

Description

technical field [0001] The invention relates to the technical field of electrophoretic coating, in particular to a method for preparing an environment-friendly cationic electrophoretic coating emulsion and a method for using it, which not only reduces the manufacturing time but also reduces the amount of solvent used. Background technique [0002] The traditional cathodic epoxy electrophoretic coating emulsion is composed of aminated epoxy resin and polyisocyanate curing agent, and then dispersed in the water phase to form an emulsion. Its typical production process is liquid epoxy resin, bisphenol A and chain extender, and in the presence of a catalyst, conduct chain extension reaction to form a modified epoxy resin with an epoxy equivalent of 900-1200. The reaction conditions are that the temperature must be above 130°C, and the reaction time needs 2-3 hours. [0003] When the epoxy equivalent reaches the set value and the chain extension reaction is completed, the temper...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/44C08G18/58
CPCC08G18/58C09D5/4465C09D5/4476C09D5/4496C09D175/04Y02P20/10
Inventor 顾丽萍丁志扬
Owner 浙江铭孚金属涂装科技有限公司
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