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Powder coating compound for coating thermal sensitive substrate and coating method

A technology for heat-sensitive substrates and powder coatings, applied in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of affecting surface effects, impact, high melt viscosity, etc.

Inactive Publication Date: 2012-09-26
TIANCHANG YINHU PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The low-temperature curing technology of powder coatings is very difficult. Powder coatings are a low-temperature latent curing system. Epoxy resin and curing agent are both solids with high softening point. They have high melt viscosity at low temperature and are difficult to level when cured at low temperature, which will affect the surface effect. Using resin and curing agent with low softening point can reduce the viscosity of the system. Melt viscosity, but the storage stability of the powder becomes poor, and it needs to be stored in low temperature refrigeration, which brings a lot of inconvenience to use; it can be seen that the key problem of powder coating ultra-low temperature curing technology is to find a combination of storage stability, melting, fluidity and A system with a good balance between curing properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A powder coating composition for coating heat-sensitive substrates, the components of the composition and parts by weight are: (a) 15 parts by weight of polyester resin, the glass transition temperature of which is 32°C;

[0057] (b) the curing agent of 1 weight part;

[0058] (c) the talc of 38 parts by weight and the barium carbonate of 2 parts by weight;

[0059] (d) 13 parts by weight of zinc stearate whose melting temperature is 125°C.

[0060] The preparation method: the above ingredients → premixing → segmented warm melt extrusion → tablet pressing → pulverization → sieving to obtain a powder coating composition for coating heat-sensitive substrates.

[0061] coating the coating composition on the surface of the substrate; heating the coated substrate so that the coating composition melts and flows at a temperature of 60-120°C; by radiation and / or Thermal energy solidifies in a molten state.

Embodiment 2

[0063] A powder coating composition for coating heat-sensitive substrates, the components of the composition and parts by weight are: (a) 86 parts by weight of epoxy-siloxane resin, the glass transition temperature of which is 75°C ;

[0064] (b) the curing agent of 26 parts by weight;

[0065] (c) 2.5 parts by weight of talc and 2.5 parts by weight of titanium dioxide;

[0066] (d) 1 part by weight of polyamide wax whose melting temperature is 155°C.

[0067] Its preparation method and coating method are the same as in Example 1.

Embodiment 3

[0069] A powder coating composition for coating heat-sensitive substrates, the components of the composition and parts by weight are: (a) 20 parts by weight of polyurethane resin and 10 parts by weight of (meth)acrylic resin, the glass The transformation temperature is 45°C;

[0070] (b) the curing agent of 3 parts by weight;

[0071] (c) the talc of 26 parts by weight and the magnesium carbonate of 6 parts by weight;

[0072] (d) 10 parts by weight of polyethylene wax having a melting temperature of 140°C.

[0073] Its preparation method and coating method are the same as in Example 1.

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Abstract

The invention relates to a powder coating compound for coating a thermal sensitive substrate and a coating method. The powder coating compound comprises the following components by weight part: (a) 15-86 weight parts of resin adhesives, (b) 1-26 weight parts of curing agents, (c) 5-40 weight parts of padding mixtures, and (d) 1-13 weight parts of wax additives. The coating method comprises the following steps of: coating the powder coating compound on the surface of the substrate; heating the coated substrate, so as to cause the powder coating compound to be molten and flow under a temperature at 60-120 DEG C; and curing the powder coating compound under the molten state through radiation and / or heat energy. The invention provides the powder coating compound which can be stably stored. A (high) flexibly polymer substrate can be supplied by the powder coating compound and the powder coating compound can flow and can be cured under low temperature, so that the powder coating compound can be coated on the thermal sensitive substrate.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a powder coating composition for coating heat-sensitive substrates and a coating method. Background technique [0002] Powder coating is a coating that is applied in powder form. The biggest difference between it and general solvent-based and water-based coatings is that it does not use solvent or water as a dispersion medium. Because of the recyclable and reused spraying material in the coating process, no solvent volatilization, safe production and construction, easy automation of coating, and improved productivity, it has become a new coating product with rapid development. The application range of powder coatings has gradually penetrated from the initial field of household appliances to various industries, and expanded to petrochemical, electromechanical instruments, ships, electronic devices, construction, transportation, machinery, automobiles, containers, packagin...

Claims

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Application Information

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IPC IPC(8): C09D167/00C09D163/00C09D183/04C09D175/04C09D133/00C09D5/03
Inventor 管伟
Owner TIANCHANG YINHU PAINT
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