Cathode electrophoresis paint with combined bottom surfaces and preparation method and application method thereof

A cathodic electrophoretic coating, bottom surface technology, applied in electrophoretic coatings, polyurea/polyurethane coatings, coatings, etc., can solve problems such as technical difficulties and no mature products.

Active Publication Date: 2013-10-02
GUANGDONG KODEST EP SC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many researchers in this area, but it is still in the developmen

Method used

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  • Cathode electrophoresis paint with combined bottom surfaces and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example one

[0040] A preparation method of cathode electrophoretic paint with one bottom surface, including the following steps:

[0041] (1) Preparation of curing agent

[0042] It is prepared by mixing trimethylolpropane and alcohol ether solvents and heating, adding isocyanate dropwise before the temperature reaches 60°C, and then holding it at 60°C for 1 hour, then heating to 70°C, and holding it at 70°C for 2 hours. Curing agent, wherein the molar ratio of isocyanate, alcohol ether solvent and trimethylolpropane is 2:1:1;

[0043] (2) Preparation of main resin

[0044] (1) Take a low molecular weight epoxy resin with a molar ratio of 7:4:1, bisphenol A and isooctanoic acid to react at 120°C for 3 hours to prepare a medium molecular weight epoxy resin with a resin average molecular weight of 1000;

[0045] (2) Take the middle molecular weight epoxy resin, N-methylethanolamine and ketimine with a molar ratio of 4:4:1 under the conditions of 110°C for a reaction time of 2 hou...

Example Embodiment

[0075] Example 2

[0076] A preparation method of cathode electrophoretic paint with one bottom surface, including the following steps:

[0077] (1) Preparation of curing agent

[0078] It is prepared by mixing trimethylolpropane and alcohol ether solvents and heating, adding isocyanate dropwise before the temperature reaches 60°C, then keeping it at 60°C for 2 hours, heating it to 70°C, and keeping it at 70°C for 2 hours. Curing agent, wherein the molar ratio of isocyanate, alcohol ether solvent and trimethylolpropane is 2.5:2:1.5;

[0079] (2) Preparation of main resin

[0080] (1) Take a low molecular weight epoxy resin with a molar ratio of 9:4:1, bisphenol A and isooctanoic acid to react at 130°C for 4 hours to prepare a medium molecular weight epoxy resin with a resin average molecular weight of 2000;

[0081] (2) Take the medium molecular weight epoxy resin, N-methylethanolamine and ketimine with a molar ratio of 5:5:1 and react at 20°C for 3 hours to prepare the main resin;

[...

Example Embodiment

[0102] Example three

[0103] A preparation method of cathode electrophoretic paint with one bottom surface, including the following steps:

[0104] (1) Preparation of curing agent

[0105] It is prepared by mixing trimethylolpropane and alcohol ether solvents and heating, adding isocyanate dropwise before the temperature reaches 60°C, and then holding at 60°C for 1.5 hours, then heating to 70°C, and holding at 70°C for 2 hours. Curing agent, wherein the molar ratio of isocyanate, alcohol ether solvent and trimethylolpropane is 2.3:1.5:1.2;

[0106] (2) Preparation of main resin

[0107] (1) A low molecular weight epoxy resin with a molar ratio of 8:4:1, bisphenol A and isooctanoic acid were reacted at 125°C for 3.5 hours to prepare a medium molecular weight epoxy resin with a resin average molecular weight of 1500;

[0108] (2) Take the middle molecular weight epoxy resin, N-methylethanolamine and ketimine with a molar ratio of 4.5:4.6:1 at 115°C for a reaction time of 2.5 hours to pre...

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Abstract

The invention relates to a preparation method for cathode electrophoresis paint with combined bottom surfaces. The preparation method comprises the following steps of preparing a curing agent, matrix resin, dispersion resin, positive ion acrylic resin, an emulsion I, a positive ion acrylic emulsion, and mill base sequentially, then mixing the mill base, the emulsion I, the positive ion acrylic emulsion and deionized water according to the proportion of 1:(1-2):(3-5):(6-7), regulating the solid content of a paint working solution to be 15%-30%, after 48 hours of circulation, coating through electrophoresis so as to prepare the cathode electrophoresis paint with the combined bottom surfaces. When the cathode electrophoresis paint with the combined bottom surfaces is baked, the epoxy component with strong surface tension is deposited at the under layer, and the crylic acid component with little surface tension is on the surface layer, so that the coating with good corrosion resistance and weather resistance is formed.

Description

Technical field [0001] The present invention involves a type of electro -sword paint, especially a cathode electrophoretic coatings and preparation methods and methods of use. Background technique [0002] Cathode electrophoretic coatings are usually based on epoxy resins with good corrosion resistance.Epoxy resin is mostly bisphenol A. Because it has high adhesion and excellent anti -corrosion performance, it is often used as primer and anticorrosive paint.Although its corrosion resistance is excellent, the weather resistance is not good enough.Acrylic resin is rich in weather tolerance and good color, lighting, and abundant sources of monomer, so it is widely used.It is generally used as the bottom layer of coating. The top paint still uses acrylic resin paint to ensure weather resistance and plumpness.By using the use of the bottom surface -colored type of cathode electrophoretic coating, the performance of epoxy resin coatings and acrylic coatings is comprehensively applied t...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D7/12C09D5/44C08G18/58C08G18/62C08F220/18C08F220/28C08F220/14C08F220/32C08F212/08
Inventor 李文庄高睿何愿文陈立志黄小勇梁卫南
Owner GUANGDONG KODEST EP SC CO LTD
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