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High-strength high wear resistance solvent-based nano automotive topcoat

An automotive topcoat, solvent-based technology, used in polyurea/polyurethane coatings, fibrous fillers, dyed low-molecular-weight organic compounds, etc. problem, to achieve the effect of low cost, good compactness and good stain resistance

Inactive Publication Date: 2012-06-20
TIANJIN KAIMEI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 1011255311A discloses a preparation method of wear-resistant paint main agent, including polyurethane prepolymer, polar organic solvent, silicon oxide, aluminum oxide; in this invention, ketones with high toxicity are used as organic solvents, and are resistant to Abrasiveness is not obvious
Patent CN100554352C discloses a preparation method of water-based nano-coating, adding 5-15% of nano-powder to the water-based film-forming base material, and the scratch resistance reaches 96-99%, but the steps are relatively complicated and various additives are required , compared with the present invention, the amount of nano-powder added to achieve the same wear resistance is larger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Under stirring at room temperature, add 0.25g of stearic acid to 25mL of absolute ethanol, stir until completely dissolved, and name the resulting solution A; add 1.0g of nanometer γ-Al 2 o 3 , added to absolute ethanol, and ultrasonically treated at an ultrasonic frequency of 40KHz for 60min to disperse the nano-alumina particles evenly, and the obtained solution was named B. Then A solution and B solution were mixed, and the resulting mixture was simultaneously refluxed and stirred at 120°C for 4 hours. After cooling to room temperature, the solid product was centrifuged and dried at 80°C for 2 hours to obtain hydrophobic nano-γ-Al 2 o 3 ;

[0020] (2) Under stirring at room temperature, 0.6g (addition amount is 1.0wt% of solvent-based polyurethane) hydrophobic nano-γ-Al 2 o 3 Add to 30g of isobutanol while stirring for 5min; ultrasonically treat the above mixture for 40min at an ultrasonic frequency of 40KHz, and then obtain a uniformly dispersed nano-slurry;...

Embodiment 2

[0024] The preparation process is the same as in Example 1, only changing the hydrophobic nano-γ-Al 2 o 3 The amount of is 6.0g (addition amount is 10.0wt% of solvent-based polyurethane), and other conditions are constant, after this solvent-based nano car topcoat spray paint film, dry at 140 ℃, the gained sample is named as b.

Embodiment 3

[0026] The preparation process is the same as in Example 1, only changing the hydrophobic nano-γ-Al 2 o 3 The amount of is 3.0g (addition amount is 5.0wt% of solvent-based polyurethane), other conditions are constant, after this solvent-based nano car topcoat spray paint film, dry at 140 ℃, the gained sample is named as c.

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PUM

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Abstract

The invention relates to the field of chemistry painting. The invention provides a high-strength high wear resistance solvent-based nano automotive topcoat. According to the invention, the high-end automotive nano topcoat which has high hardness, wear resistance, impact resistance, strong film adhesion, good weather resistance and good glossiness is prepared by utilizing stearic acid to modify nano gamma-Al2O3 particles to change the hydrophilic nano gamma-Al2O3 particles into the hydrophobic nano gamma-Al2O3 particles and then dispersing the hydrophobic nano gamma-Al2O3 particles serving as fillings for bearing a load into polyurethane.

Description

technical field [0001] The invention proposes a method for preparing a high-strength, high-abrasion solvent-based nanometer automobile topcoat. The technology combines nanometer γ-Al 2 o 3 Applied to solvent-based polyurethane, it can significantly improve the wear resistance and hardness of the paint film. Background technique [0002] Automobile coating is a variety with high technology content and high added value in industrial coatings, which represents the technical level of a country's coatings industry. With the improvement of automobile manufacturing technology and the increasing requirements for automobile appearance, further development of wear-resistant, corrosion-resistant, heat-insulating, beautiful and colorful multi-functional automobile coatings has become a new task for paint workers. [0003] Because the surface of the car body is often scratched by hard objects such as metals and branches and impacted by various splashing stones and debris, scratches an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/12C09C1/40C09C3/08
Inventor 李伟王晖王寰付斌韩冲
Owner TIANJIN KAIMEI TECH
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