Spraying process of ultrafine powder paint

An ultra-fine powder and coating technology, which is applied to the device, coating, and pretreatment surface of the surface coating liquid, etc., can solve the problem of less fluorocarbon coating, and achieve less sediment, smooth and uniform coating, and stable quality. Effect

Inactive Publication Date: 2018-08-17
WUHU XIECHENG METAL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most powder spraying methods use high-energy spraying methods such as electrostatic spraying, fluidized bed coating, electrostatic fluidized bed, electrostatic oscillation, powder electrophoresis, and flame spraying. The equipment used for different processes is also different. The electrostatic spraying method is the mainstream method in China. The powder electrostatic spraying process is generally divided into three steps, namely pretreatment, electrostatic spraying and curing. Electrostatic spraying is the core, but the quality of the pretreatment also directly affects the quality of electrostatic spraying. The powder coatings for electrostatic spraying are mostly polyester conventional powders, and there are few applications for fluorocarbon coatings with high weather resistance and high corrosion resistance. Therefore, the research on the electrostatic spraying of ultrafine fluorocarbon powder coatings, It has the function of expanding the application field of ultrafine fluorocarbon powder coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The spraying process of superfine powder coating in the present embodiment, concrete steps are as follows:

[0025] 1) Water washing: firmly fix the sheet metal stamping parts to be sprayed on the cleaning rack, and keep the fixing direction consistent, and then use a high-pressure water gun with a water outlet diameter of 3cm to wash the sheet metal stamping parts under a pressure of 8MPa. The pressure is high, the distance between the outlet of the high-pressure water gun and the workpiece is kept at 0.5m, and the dust and impurities on the surface of the sheet metal stamping parts are removed by washing for 2 minutes;

[0026] 2) Ultrasonic acid corrosion: Place the washed sheet metal stamping parts in a citric acid solution tank equipped with an ultrasonic transmitter, and then add a citric acid solution with a pH of 5 and a temperature of 40°C. According to the principle of heating, turn on the ultrasonic transmitter at the same time and set the ultrasonic power to...

Embodiment 2

[0032] This example is the same as Example 1, except that the pH of the citric acid solution in the ultrasonic acid corrosion in this example is 4.5, the ultrasonic power is 150w, the frequency is 20Hz, the corrosion time is 5min, the temperature is 35°C, and the vitrified zirconium fluoride The pH of the acid potting solution is 5.5, the potting time is 100s, and the potting point is 5 points.

Embodiment 3

[0034] This embodiment is the same as Embodiment 1, except that the atomization pressure of electrostatic spraying in this embodiment is 0.3MPa, the powder supply pressure is 0.1MPa, the high voltage electrostatic is 85kV, the output current is 10μA, the ambient temperature is 40°C, and the humidity is 45%.

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Abstract

The invention discloses a spraying process of ultrafine powder paint, and relates to the technical field of paint spraying. The spraying process selects metal plate punching parts and fluorine carbonultrafine powder paint with a particle size of 15-25 microns for surface treatment by adopting high-pressure fresh water flushing, ultrasonic acid corrosion and vitrification; then, a vacuum electrostatic spraying method is used for spraying; and a temperature of 220-250 DEG C is used for baking and curing. The spraying process adopts ultrasonic auxiliary citric acid for surface corrosion of workpieces to achieve an effect of activating the surfaces of the workpieces, adopts vitrification to replace traditional phosphating to realize no-phosphorus treatment, reduces emission of waste slag andwaste water, reduces such costs as manpower and equipment maintenance, adopts the vacuum electrostatic spraying process, has the advantages of low energy consumption and environmental protection, is higher in atomization effect and more smooth and uniform in coating, and generates no water spot and gas spot.

Description

technical field [0001] The invention belongs to the technical field of paint, relates to the technical field of paint spraying, in particular to a spraying process of superfine powder paint. Background technique [0002] Powder coating is a kind of solid powder coating, which has the advantages of no solvent, recycling rate as high as 99%, easy automatic production, good appearance, corrosion resistance and outdoor durability, etc. It meets the requirements of environmental protection and is a good environmental protection type. For the performance of powder coatings, the particle size is the main factor affecting its related performance parameters, such as coating characteristics, leveling, powdering rate and recovery rate, etc. The average particle size of ultrafine powder coatings is 25- 28μm, the molecular shape of the ultrafine powder coating is angular, and by changing the chargeability of the molecules, the powder is arranged in a single molecular layer when it is glu...

Claims

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Application Information

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IPC IPC(8): B05D1/06B05D3/12B05D3/10B05D3/02
CPCB05D1/06B05D3/0254B05D3/102B05D3/12B05D2202/00B05D2350/63
Inventor 冯友兵陈之群
Owner WUHU XIECHENG METAL PROD
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