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Coating technology of water-based coating for thick steel plate

A coating process, water-based paint technology, applied in the direction of surface coating liquid devices, coatings, pre-treated surfaces, etc., can solve the problems of inapplicability, and achieve the effects of cost saving, pollution reduction, and low energy consumption

Inactive Publication Date: 2020-06-09
CHINA RAILWAY CONSTR HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a kind of water-based paint coating process for thick steel plates, which can effectively solve the inapplicability of the water-based paint coating process for ordinary steel plates in the prior art. Problems with thick plate steel structures

Method used

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  • Coating technology of water-based coating for thick steel plate
  • Coating technology of water-based coating for thick steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, the water-based coating process of thick steel plate comprises the following steps:

[0043] S11: Perform mechanical surface treatment on the substrate and clean it with a solvent to remove dust, oil, rust, scale, water-soluble salt, welding residue, flash and burrs on the surface of the substrate.

[0044] S12: Preheat at 60-80°C for 30 minutes.

[0045] S13: Under the condition that the construction environment temperature is 10°C and the relative humidity is 85%, spray the primer on the pretreated substrate, the spraying method is air spraying, the diameter of the spray gun is 2.0mm, and the distance between the nozzle of the spray gun and the substrate 300mm, span 1 / 3, gun speed 500mm / s, gun pressure 0.35MPa. Leveling for 5 minutes after spraying, and then drying at 60°C for 45 minutes, with a dry film thickness of 50 μm.

[0046] S13: Spray the topcoat after the primer paint film is dry. The spraying method is air spraying. The diameter of the...

Embodiment 2

[0048] In this embodiment, the water-based coating process of thick steel plate comprises the following steps:

[0049] S21: Perform mechanical surface treatment on the substrate and clean it with a solvent to remove dust, oil, rust, scale, water-soluble salt, welding residue, flash and burrs on the surface of the substrate.

[0050] S22: Preheat at 60-80°C for 30 minutes.

[0051] S23: Under the condition that the construction environment temperature is 40°C and the relative humidity is 50%, spray the primer on the pretreated substrate, the spraying method is air spraying, the diameter of the spray gun is 2.0mm, and the distance between the nozzle of the spray gun and the substrate 200mm, span 1 / 2, gun speed 300mm / s, gun pressure 0.55MPa. The surface paint film was leveled for 10 minutes after spraying, and then dried at 80°C for 30 minutes, and the dry film thickness was 80 μm.

[0052] S24: Spray the topcoat after the primer paint film is dry. The spraying method is air s...

Embodiment 3

[0054] In this embodiment, the water-based coating process of thick steel plate comprises the following steps:

[0055] S31: Perform mechanical surface treatment on the substrate and clean it with a solvent to remove dust, oil, rust, scale, water-soluble salt, welding residues, flash burrs, etc. on the surface of the substrate.

[0056] S32: Preheat at 60-80°C for 30 minutes.

[0057] S33: Under the condition that the construction environment temperature is 10°C and the relative humidity is 85%, spray the primer on the pretreated substrate. The spraying method adopts high-pressure airless spraying, the diameter of the spray gun is 2.5mm, and the distance between the nozzle of the spray gun and the substrate The minimum distance is 300mm, the span is 1 / 3, the gun speed is 500mm / s, and the spray gun pressure is 15MPa. Leveling for 5 minutes after spraying, and then drying at 60°C for 45 minutes, with a dry film thickness of 50 μm.

[0058] S34: Spray the topcoat after the prim...

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Abstract

The invention discloses a coating technology of a water-based coating. The technology comprises the steps that first, the surface of a base material is pre-processed; then, the base material is pre-heated, wherein the pre-heating temperature range is 60-80 DEG C; primer is sprayed after pre-heating is performed, and levelling and drying are performed, wherein the thickness of a dry film of the primer is 50-80 microns, the levelling temperature is the normal temperature, and the levelling time is 5-10 minutes; and after the primer is dried, finish paint is sprayed, and levelling and drying arepreformed again, wherein the thickness of a dry film of the finish paint is 40-60 microns, the levelling temperature is the normal temperature, and the levelling time is 5-10 minutes. By adopting thecoating technology of the water-based coating, by setting reasonable technical parameters, a thick steel plate structure is coated with the water-based coating, the technology is simple and easy to implement, the demand for the construction condition and energy consumption are low, the construction time is shortened, the production efficiency is improved, the product does not have the obvious defect of a paint film, the demand for the oil paint performance of the product such as wear resistance and weather resistance is met, and the cost is effectively lowered for enterprises.

Description

technical field [0001] The invention relates to the technical field of coating technology, more specifically, to a water-based paint coating process for thick steel plates. Background technique [0002] Because construction machinery is generally used in harsh environments, it has high requirements for corrosion resistance and weather resistance. The requirements of corrosion resistance and weather resistance can be met by spraying paint on the metal surface of construction machinery. At present, almost all construction machinery adopts traditional solvent-based protective coatings. Although the construction performance is good and the construction window is large, organic solvents are flammable and explosive, and the emissions seriously exceed the standard, which cannot meet the requirements of the new environmental protection law. Water-based coatings refer to replacing most of the organic solvents in the coatings with water. The coatings use water as the solvent or dispe...

Claims

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Application Information

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IPC IPC(8): B05D7/14B05D7/00B05D3/02B05D3/12
CPCB05D3/0218B05D3/0254B05D3/12B05D7/14B05D7/546B05D2202/10B05D2401/20B05D2451/00B05D2503/00B05D2504/00B05D2420/01B05D2425/02B05D2425/01B05D2420/02
Inventor 张静刘汉平谭亮高世文雷惊天杨力强吕加鹏梅延滨
Owner CHINA RAILWAY CONSTR HEAVY IND
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