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Method for producing watersoluble floating coat paint suitable for original factory of vehicle and repair

A technology for automobiles and coatings, used in vehicle maintenance/repair, polyurea/polyurethane coatings, coatings, etc., can solve problems that have not been mentioned, and achieve the effects of excellent flexibility, environmental friendliness, and good physical and mechanical properties

Inactive Publication Date: 2008-10-29
朱斌 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no reference to the literature on the research of general-purpose primer coatings for automotive repairs

Method used

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Examples

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preparation example Construction

[0021] The present invention is a kind of preparation method that is suitable for the water-based intermediate coating coating that automobile original factory and repairing use, it comprises following steps and process condition:

[0022] 1) Synthesis of water-dispersed resin: Add polypolyol, dimethylolpropionic acid (DMPA), and a small amount of N-methylpyrrolidone (NMP) into the reaction kettle, heat up to 60-160°C and stir to mix evenly. Then add isocyanate to react for 1 to 4 hours, cool down to room temperature, add acrylic acid monomer, neutralize the mixture with triethylamine (TEA), stir for 0.5 to 1 hour, add water to disperse it in water, and then add free radicals to initiate agent, heated to 50-130°C and reacted for 1-4 hours, and finally slowly added chain extender, reacted at 50-130°C for 0.5-1 hour to obtain a water-dispersible resin with good dispersibility;

[0023] 2) It is the modification of hydrophilic blocked polyisocyanate. Add 40% to 70% (parts by weig...

Embodiment 1

[0031] Step 1, the making of synthetic water-dispersed resin: in the reaction still equipped with agitator, thermometer, condenser, water separator and nitrogen device, add 40% polyester diol, 2% DMPA, a small amount of NMP, Introduce nitrogen, stir and heat up to 80°C, then add HDI with a ratio of isocyanate to polypolyol (ie, mol ratio) of 1 to react for 2 hours, cool down to room temperature, add 20% MMA, use TEA Neutralize the mixture, stir for 1 hour, add water to disperse it in water, then add AIBN, heat up to 120°C for 2 hours, and finally slowly add polyhydroxymethylalkanoic acid, react for 1 hour at 120°C to prepare A water-dispersible resin with good dispersibility can be obtained.

[0032] Step 2, the preparation of hydrophilic blocked polyisocyanate: add 40% HDI monomer to the reaction kettle equipped with stirrer, thermometer, condenser, water separator and nitrogen device, stir and heat up, Add an appropriate amount of organic tin catalyst, the reaction temperat...

Embodiment 2

[0041] Step 1, synthesizing water-dispersed resin: in the reaction kettle equipped with agitator, thermometer, condenser, water separator and nitrogen device, add 50% polyethylene adipate, 2% DMPA, a small amount of NMP , feed nitrogen, stir and heat up to 100°C, then add IPDI with a ratio of isocyanate to polypolyol (i.e. mol ratio) of 1 to react for 1 hour, drop to room temperature, add 30% BA, use TEA neutralizes the mixture, stirs for 1 hour, adds water to disperse it, then adds K 2 S 2 o 3 , the temperature was raised to 110°C for 3 hours, and finally polyhydroxymethylalkanoic acid was slowly added, and reacted at 110°C for 1 hour to obtain a water-dispersible resin with good dispersibility.

[0042] Step 2, synthesizing hydrophilic blocked polyisocyanate: add 30% IPDI monomer to the reaction kettle equipped with stirrer, thermometer, condenser, water separator and nitrogen device, stir and heat up, add Appropriate amount of organic tin catalyst, the reaction temperatu...

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Abstract

The invention provides the preparation method of a water intermediate coating suitable for automobile factories and repair. The coating prepared by the method is universally suitable for automobile factories and repair. The preparation method comprises the following steps and process conditions: (1) synthesizing water-dispersible resin; (2) modifying hydrophilic polyisocyanate; (3) preparing the intermediate coating for automobile factories and repair; and (4) mixing the intermediate coating prepared in step (3) with the hydrophilic end-terminated polyisocyanate synthesized in step (2) to obtain the final product. The prepared intermediate coating has high applicability and is suitable for factory manufacturing and for repair. The intermediate coating is very friendly to the environment and greatly reduces the use of and the dependence on organic solvent, thus effectively conserving the energy resources. Additionally, the coating has the advantages of excellent flexibility, particularly high chip resistance and water resistance, smooth and fine coating surface and excellent interlayer adhesive force with the prime coat and the top coat.

Description

【Technical field】 [0001] The invention relates to a method for preparing a coating, in particular to a method for preparing a water-based intermediate coating suitable for both original and repaired automobiles. 【Background technique】 [0002] The middle coating is also called the intermediate coating, which is the coating between the primer and the topcoat, and the coating used is called the middle coating. The main function of the middle coating is to fill and cover the defects such as blisters, sand marks, pinholes, and pitting on the surface of the putty and paint film, to further improve the vividness and fullness of the topcoat coating, improve the decorativeness, and increase the coating quality. Thickness for improved water resistance. At present, solvent-based polyester is widely used in the coatings used in automobiles, and its organic solvent content is high, about 50%, which does not meet the requirements of environmental protection regulations, while water-base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/02B05D7/14B60S5/00
Inventor 朱斌汤汉良向弘尹诗衡匡同春
Owner 朱斌
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