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Plastic powder coating process for anti-spotting of surfaces under wet conditions

A technology of surface spots and conditions, which is applied to the device for coating liquid on the surface, the pretreatment surface, the coating and other directions, which can solve the problems affecting the spraying effect of the workpiece, spots, etc.

Active Publication Date: 2018-03-16
NINGBO VIOLET LIGHTING ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are some deficiencies in the existing plastic powder spraying process in practical application: the current plastic powder spraying process is used under dry continental climate conditions, which can make the surface of the workpiece achieve a good spraying effect, but these existing plastic powder Once the spraying process is used in humid conditions such as the subtropical humid marine monsoon climate, even if the same workpiece is sprayed with the same equipment, the same air pressure, the same high-voltage static electricity and the same conveying speed, it will still be affected by changes in the salt and moisture in the air. , and spot-like defects appear on the surface of the workpiece from time to time, which seriously affects the spraying effect of the workpiece

Method used

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  • Plastic powder coating process for anti-spotting of surfaces under wet conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) The first degreasing step of the degreasing agent: under the condition that the pH value is 12 and the temperature is 40°C, the workpiece to be sprayed is degreased with a degreasing agent, and the degreasing process lasts for 10 minutes; the degreasing step is used to remove the oil and impurities;

[0024] (2) Cleaning step: under the condition that the pH value is 7, utilize clear water to clean the workpiece to be sprayed after the degreasing process, and the cleaning process lasts for 3 minutes; Clean the workpiece to be sprayed to wash off the remaining degreasing agent on the workpiece to be sprayed;

[0025] (3) Secondary degreasing step of soda ash: under the condition that the pH value is 9 and the temperature is 20°C, use soda ash to degrease the cleaned workpiece to be sprayed, and the degreasing process lasts for 3 minutes;

[0026] (4) The surface conditioning step of the workpiece to be sprayed: under the conditions of pH value 8 and temperature 20°C...

Embodiment 2

[0039] (1) One-time degreasing step of degreasing agent: under the condition of pH value of 13 and temperature of 45°C, the workpiece to be sprayed is degreased with a degreasing agent, and the degreasing process lasts for 12.5 minutes; oil and impurities;

[0040] (2) Cleaning step: under the condition that the pH value is 7.5, utilize clear water to clean the workpiece to be sprayed after the degreasing process, and the cleaning process lasts for 4 minutes; Clean the workpiece to be sprayed to wash off the remaining degreasing agent on the workpiece to be sprayed;

[0041] (3) Secondary degreasing step of soda ash: under the condition of pH value of 9.5 and temperature of 25°C, use soda ash to degrease the cleaned workpiece to be sprayed, and the degreasing process lasts for 4 minutes;

[0042] (4) The surface conditioning step of the workpiece to be sprayed: under the conditions of pH value 8.5 and temperature 25°C, the surface of the workpiece to be sprayed is treated wit...

Embodiment 3

[0055] (1) The first degreasing step of the degreasing agent: under the condition that the pH value is 14 and the temperature is 50°C, the workpiece to be sprayed is degreased with a degreasing agent, and the degreasing process lasts for 15 minutes; the degreasing step is used to remove the oil and impurities;

[0056] (2) Cleaning step: under the condition that the pH value is 8, utilize clear water to clean the workpiece to be sprayed after the degreasing process, and the cleaning process lasts for 5 minutes; Clean the workpiece to be sprayed to wash off the remaining degreasing agent on the workpiece to be sprayed;

[0057] (3) Secondary degreasing step of soda ash: under the condition that the pH value is 10 and the temperature is 30° C., use soda ash to degrease the cleaned workpiece to be sprayed, and the degreasing process lasts for 5 minutes;

[0058] (4) Surface conditioning step of the workpiece to be sprayed: under the conditions of pH value 9 and temperature 30°C,...

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Abstract

The invention relates to a surface-spot-preventing plastic powder spraying process suitable for the moistening condition. A to-be-sprayed workpiece is subject to primary degreasing through a degreasing agent, washing, secondary degreasing with sodium carbonate, surface tempering, phosphating, secondary washing, passivating treatment, air drying and workpiece hanging treatment in sequence, and only an anticorrosive protection film is arranged on the surface of the to-be-sprayed workpiece; the humidity keeps to range from 40%RH to 50%RH, the static voltage ranging from 55 KV to 60 KV and the static current ranging from 5 uA to 10 uA are applied to a spraying gun, plastic powder sprayed through the spraying gun carries static and is attracted to the surface of the to-be-sprayed workpiece, the steps of solidification leveling and cooling are executed, and therefore the workpiece with the poor phenomenon like spots on the surface can be avoided under the moistening condition; and the problem that application of an existing plastic powder spraying process is limited to air humidity is solved.

Description

technical field [0001] The invention relates to the field of plastic powder spraying, in particular to a plastic powder spraying process suitable for preventing surface spots under wet conditions. Background technique [0002] Plastic powder spraying refers to the use of static electricity to absorb plastic powder on the surface of the workpiece to be sprayed and then heat it through the drying tunnel to heat the plastic powder to a molten state, allowing the melted plastic powder to level off and solidify on the surface of the workpiece to be sprayed. A process of coating. [0003] There are some deficiencies in the existing plastic powder spraying process in practical application: the current plastic powder spraying process is used under dry continental climate conditions, which can make the surface of the workpiece obtain a good spraying effect, but these existing plastic powder Once the spraying process is used in humid conditions such as the subtropical humid marine mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D1/06B05D3/10B05D3/12B05D3/04
CPCB05D1/06B05D3/002B05D3/007B05D3/0426B05D3/10B05D3/108B05D3/12B05D2350/30
Inventor 孙继国姚发春陈越华
Owner NINGBO VIOLET LIGHTING ELECTRIC
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