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Powder electrostatic spraying process for metal parts

An electrostatic spraying, metal parts technology, applied in the coating, the device for coating liquid on the surface, the surface pretreatment, etc., can solve the problems of excessive thickness of the coating film, uneven curing temperature, incomplete treatment, etc. The effect of strong layer adhesion, uniform surface coating and uniform color

Inactive Publication Date: 2017-11-28
苏州盈腾五金制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electrostatic powder spraying process can obtain aluminum with rich colors, there are the following defects in the current electrostatic powder spraying process: 1) uneven curing temperature, which makes the curing time of different racks inconsistent and does not lead to color difference in the same type of aluminum; 2 ) The amount of powder sprayed and the spraying time are unevenly controlled, resulting in too thick or too thin a coating film; 3) The coating film after spraying is prone to orange peel or bubbling; 4) The surface pretreatment is not complete enough, and the coating film after spraying Circular or oval pits are formed on the surface of the aluminum material; 5) Part of the coating on the surface of the aluminum material is easy to fall off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A powder electrostatic spraying process for metal parts, comprising the following steps:

[0019] (1) Surface pretreatment: the surface of the workpiece is chromized or sandblasted;

[0020] (2) Covering: If some parts of the workpiece do not require coating, they can be covered with protective glue before preheating to avoid spraying paint;

[0021] (3) Preheating: the workpiece can be preheated to 180-200°C;

[0022] (4) Spraying: Under the high-voltage electrostatic field, connect the powder spray gun to the negative pole, and the workpiece is grounded as the positive pole to form a circuit. The powder is sprayed from the spray gun with the help of compressed air, which has a negative charge, and is sprayed on the workpiece according to the principle of opposite sex attraction;

[0023] (5) Curing: After spraying, the workpiece is sent to the drying room for heating, and a certain constant temperature is reserved for the complete curing of the powder;

[0024] (6) ...

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PUM

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Abstract

The invention discloses a powder electrostatic spraying process for metal parts. The powder electrostatic spraying process for the metal parts comprises the steps of pretreatment, electrostatic spraying and high-temperature curing. According to the process, the coating prepared by the process is uniform in surface, free of bubbling, free of pits, high in adhesion, not prone to fall off and uniform in color and luster.

Description

technical field [0001] The invention relates to a powder electrostatic spraying process for metal parts. Background technique [0002] Since the 1980s, with the rise of high-rise buildings, luxurious halls and bustling commercial streets in my country, the aluminum profile industry has developed rapidly with the introduction of production lines as the backbone. The anodizing and electrolytic coloring process of aluminum profiles has been developed rapidly as a surface treatment technology for construction and decoration. However, the electrolytic coloring of the anodized film can only be obtained from champagne wine color to light / deep bronze color to black, and the color is monotonous, which cannot meet people's needs for color. Subsequent processes such as electrophoretic painting, liquid spray painting, composite coloring (combination of electrolytic coloring and dyeing) and electrostatic powder spraying can obtain colorful aluminum materials. Among them, electrostatic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/14B05D1/06B05D3/00B05D3/10B05D1/32B05D3/02
CPCB05D1/06B05D1/32B05D3/002B05D3/0218B05D3/0254B05D3/102B05D7/14
Inventor 胡兴男
Owner 苏州盈腾五金制品有限公司
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