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Aqueous coating combination and automobile intermediate coating thereof

A technology for water-based coatings and compositions, applied in coatings, polyester coatings, etc., can solve the problems of not finding the inventor's instructions for use, poor stone chip resistance, and high baking temperature

Active Publication Date: 2011-06-08
NIPPON PAINT CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN 1306055A, CN1306056A uses saturated polyester resin and isocyanate resin as the invention of the matrix to obtain water-based coatings that can be used for auto parts, but no instructions on the use of the car body by the inventor have been found
For water-based coatings with high stone chip performance requirements, the general use of water-based isocyanate will intensify the cost pressure
[0007] 2. Poor stone impact resistance
[0009] 3. The baking temperature is too high
[0010] The domestic water-based intermediate coating generally adopts a baking temperature of 150°C, which is higher than that of solvent-based coatings, which leads to an increase in energy consumption

Method used

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  • Aqueous coating combination and automobile intermediate coating thereof
  • Aqueous coating combination and automobile intermediate coating thereof
  • Aqueous coating combination and automobile intermediate coating thereof

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0062]

[0063]

[0064] Automotive Intermediate Coating

[0065] The present invention also provides an automotive intermediate coating obtained by coating the aqueous coating composition.

[0066] The composition obtained by the invention has better stability, and various performances can reach the performances required by the current solvent-based coatings. Compared with the water-based automobile intermediate coating currently used in the market, the baking temperature of the coating obtained by applying the water-based paint composition can be reduced by 10°C. Stone chip resistance and solvent resistance are superior to similar products in the market.

[0067] The coating method can adopt a method in the art. Usually, water-soluble polyester resin and water-soluble additives are uniformly stirred; sand milling; then add emulsion polyester resin, high imine amino resin and water-dispersible additives, and then adjust the pH with amine neutralizer; The coating is...

preparation Embodiment 1

[0098] (1) Mix the following components (the following components are all in parts by weight):

[0099]

[0100] The above components are dispersed at a high speed to a dispersion with a fineness of 15um.

[0101] (2) Add the following components:

[0102]

[0103]

[0104] The pH value is 8.2 and the viscosity is 60s.

preparation Embodiment 2

[0106] (1) Mix the following components (the following components are all in parts by weight):

[0107]

[0108] The above components are dispersed at a high speed to a dispersion with a fineness of 15um.

[0109] (2) Add the following components:

[0110]

[0111] The pH value is 8.2 and the viscosity is 60s.

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Abstract

The invention provides an aqueous coating combination, which comprises the following ingredients: (a) base materials, containing, by weight, 3 to 10 parts of water-soluble polyester resin, 20 to 45 parts of emulsive polyester resin, 7 to 15 parts of preimino amino resin and 1 to 2 parts of premethylate amino resin or combination thereof; (b) 10 to 60 parts by weight of pigments and filling materials; and (c) polymer science acceptable paint auxiliary agents. The invention also provides the automobile intermediate coating containing the aqueous coating combination. The invention provides an aqueous coating combination which has the advantages of high stone-beating resistant performance, lower baking temperature, lower cost and environmental protection, and an automobile intermediate coating.

Description

technical field [0001] The invention relates to a coating composition, in particular to a water-based coating composition. Background technique [0002] At present, the following steps are required for general automobile painting: pre-treatment, electrophoresis, mid-coat (usually surfacer), top coat and clear coat. In addition to the pre-treatment and electrophoresis, the coatings used in the current automobile painting (especially domestic automobile manufacturers) are basically water-based, and the other coatings are also solvent-based coatings. The large amount of solvent emissions caused by the solvent contained in solvent-based coatings will cause serious environmental pollution. When all aspects are concerned about VOC emissions, automotive coatings must be water-based. [0003] Chinese patents CN 1306055A and CN1306056A use saturated polyester resin and isocyanate resin as the invention of the matrix to obtain water-based coatings that can be used for auto parts, bu...

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D161/28C09D5/00
Inventor 刘炳权吴广士方黎明
Owner NIPPON PAINT CHINA
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