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Scrape-wearable nanometer aqueous automobile paint preparation method

A water-based paint, scratch-resistant technology, applied in polyester paint, polyurea/polyurethane paint, coating, etc., to achieve excellent scratch resistance, easy to use, and low VOC content

Active Publication Date: 2009-10-28
BASF COATINGS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to overcome the defects of existing automotive coatings, to provide a scratch-resistant, stone-resistant water-based nano-auto coating and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Firstly, the composition formula of the selected automotive coating, wherein: the coating film-forming base material polyurethane acrylate consumption is 70%, the nano-powder titanium dioxide consumption is 8%, the solvent deionized water consumption is 21%, and the additive consumption is 1%.

[0022] Put titanium dioxide with an average particle size of 40nm in a container, then add dispersant TENLO 70, antifoaming agent polydimethylsiloxane, a certain amount of solvent deionized water, and pre-disperse it with a high-speed mixer for 10 minutes, then use Vibrated by a high-speed oscillator for 1 hour to obtain a nano-powder dispersion; add the nano-powder dispersion slurry to the coating film-forming base material polyurethane acrylate, and then add the film-forming aid Texanol alcohol ester and part of the remaining disinfectant Foaming agent polydimethylsiloxane was mixed, and then dispersed with a high-speed mixer for 30 minutes to obtain a nanocomposite emulsion; t...

Embodiment 2

[0025] The composition formula of selected coating in the present embodiment is basically the same as above-mentioned embodiment 1. But the nanometer powder adopts the titanium dioxide of 60nm, its consumption is 12wt%, and the consumption of film-forming base material urethane acrylate is 66wt%. The preparation process and steps of this example are completely the same as those of Example 1 above.

[0026] Spray the final prepared coating evenly on the tinplate with a film thickness of 25±5μm, and bake it at 60°C for 30 minutes to obtain the pre-coated plate sample B, which is reserved for performance evaluation test.

Embodiment 3

[0028] First, select the composition formula of the automotive coating, in which: the coating film-forming base material urethane acrylate dosage is 70%, the nano-powder silica dosage is 8%, the solvent deionized water dosage is 21%, and the additive dosage is 1 %.

[0029] Put silicon dioxide with an average particle size of 40nm in a container, then add dispersant TENLO 70, antifoaming agent polydimethylsiloxane, and a certain amount of solvent deionized water, and pre-disperse it with a high-speed mixer for 10 minutes, then Vibrate with a high-speed oscillator for 1 hour to obtain a nano-powder dispersion; add the nano-powder dispersion slurry to the coating film-forming base material polyurethane acrylate, then add the film-forming aid Texanol alcohol ester and part of the remaining The antifoaming agent polydimethylsiloxane was mixed, and then dispersed with a high-speed mixer for 30 minutes to obtain a nanocomposite emulsion; then the crosslinking agent butylated melamin...

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Abstract

The invention relates to a preparation method of a scratch-resistant and stone-shock-resistant water-based nanometer automotive coating, which belongs to the technical field of chemical coating preparation technology. The invention combines the environmental protection characteristic of low VOC of the water-based paint with the properties of the small size effect and the surface effect of the nano-particles to prepare the scratch-resistant water-based paint. The water-based paint of the present invention has the following composition and weight percentage: paint film-forming base material 60-70%, nano-powder 5-15%, solvent water 20-25%, additive 0.5-1.0%; additive has thickening agent, dispersant, defoamer, and film-forming aid; in addition, a cross-linking agent is used, the amount of which is based on the nanocomposite emulsion, and the ratio is 0.9:1 to 1:1; the cross-linking agent is mainly a melamine-based chemical substance . The scratch resistance index of the paint coating can reach 96-99% (expressed by the gloss retention rate).

Description

technical field [0001] The invention relates to a preparation method of a scratch-resistant nanometer water-based automobile paint, which belongs to the technical field of chemical paint preparation technology. Background technique [0002] The car body is coated with a layer of paint film for protection and decoration, but during use, the car body often collides with hard objects. For example, when the car is running, it is hit by gravel on the road; when the car body is washed, impurities in the water wash away the paint film; it is also scratched by metal, branches and other objects, which affects the appearance of the car body. [0003] At the same time, as automotive coatings are becoming more environmentally friendly, water-based coatings with low VOC will become one of the mainstream automotive coatings in the future. Therefore, the development of water-based coatings with excellent scratch resistance and stone chip resistance has become an important topic for automo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/14C09D133/14C09D167/00C09D5/02B05D7/14
Inventor 施利毅张清涛张震宇杭建忠徐夏章
Owner BASF COATINGS GMBH
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