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Powder spraying process

A process and powder technology, which is applied in the field of powder spraying process, can solve the problems of low adhesion rate of base powder and flour, rework repair, unevenness, etc., and achieve the effect of reducing orange peel, increasing adhesion, and improving adhesion

Active Publication Date: 2021-08-17
江苏耀坤液压股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional coating process adopts the method of two coats and two bakes. The two coats and two bakes process can improve the corrosion resistance of the coating, but the energy consumption is large, and the operation is complicated and affects the production efficiency.
It is now replaced by the two-coating and one-baking process to improve the production efficiency of coating, but there are still the following defects: the pass rate of adhesion between the base powder and the flour is low, and the appearance is prone to orange peel and other uneven phenomena during the curing and baking process. Not meet the customer's requirements, most of them need to be reworked and repaired

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The powder spraying process includes base powder and flour. In terms of parts by mass, the composition of the base powder is 30 parts of epoxy resin, 30 parts of polyurethane resin, 0.2 parts of sanding agent, 1 part of bentonite, 0.5 parts of polyethylene wax, and 20 parts of barium sulfate. , 18 parts of titanium dioxide and 0.3 parts of pigment; the composition of flour is 50 parts of polyurethane resin, 0.5 part of sanding agent, 1.5 parts of bentonite, 2.5 parts of polyethylene wax, 25 parts of barium sulfate, 20 parts of titanium dioxide and 0.5 part of pigment.

[0026] The grade of the base powder is PCFC90673-JY from PPG Industrial Coatings Suzhou Co., Ltd.; the grade of the flour is H419083C25J from Akzo Nobel Coatings Co., Ltd.

[0027] The particle size of the base powder is 38 μm, and the particle size of the flour is 40 μm.

[0028] The powder coating process includes the following steps:

[0029] S1: Spray the primer on the surface of the workpiece to ob...

Embodiment 2

[0037] Embodiment 2 is based on embodiment 1, and the difference is that the spraying of flour is 2 passes, the spraying directions of the front spraying and the back spraying are criss-cross, the spraying powder output of flour is 360g / min, and the flour coating thickness is 72 μ m.

Embodiment 3

[0039] Embodiment 3 is based on embodiment 2, and the difference is that there are 2 sprayings of flour, the spraying directions of the front spraying and the back spraying are crisscross, the spraying powder output of flour is 240g / min, and the flour coating thickness is 48 μm.

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Abstract

The invention discloses a powder spraying process which comprises the following steps: S1, spraying bottom powder on the surface of a workpiece to obtain a bottom powder coating; s2, spraying surface powder on the surface of the bottom powder coating in the S1; and s3, baking the surface of the workpiece obtained through spraying in the S2, and solidifying the base powder and the surface powder; the base powder mainly comprises epoxy resin, polyurethane resin, a sand texture agent and an auxiliary agent; the surface powder mainly comprises polyurethane resin, a sand streak agent and an auxiliary agent; and the percentage content of the sand streak agent in the bottom powder in the total mass of the bottom powder is smaller than the percentage content of the sand streak agent in the surface powder in the total mass of the surface powder. The base powder and the surface powder both contain the sand streak agent, the sand streak agent in the surface powder accounts for a large percentage content of the total mass of the surface powder, the surface powder coating is firstly heated and cured, convex and concave sand streaks are formed on the interface of the surface powder and the base powder, and the interface area of the base powder and the surface powder is larger than the coating area, so that the adhesive force between the base powder coating and the surface powder coating is increased; and the adhesion between the coatings is tighter, and meanwhile, the orange peel phenomenon is reduced.

Description

technical field [0001] The invention relates to the technical field of painting, in particular to a powder spraying process. Background technique [0002] In the manufacture of sheet metal products, spraying technology is one of the main key process technologies of sheet metal manufacturing. At the same time, the quality of product coating is an important indicator for evaluating the quality of sheet metal. It must not only achieve good anti-corrosion performance, but also require superior outdoor durability. performance. [0003] At present, the conventional coating process adopts the method of two coats and two bakes. The two coats and two bakes process can improve the corrosion resistance of the coating, but the energy consumption is large, and the operation is complicated and affects the production efficiency. It is now replaced by the two-coating and one-baking process to improve the production efficiency of coating, but there are still the following defects: the pass ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D163/00C09D5/03B05D7/24B05D1/12
CPCC09D175/04C09D163/00C09D5/032C09D5/033B05D1/12B05D7/542B05D7/24C08L23/06C08K3/346C08L63/00C08L75/04
Inventor 丁攀孙艳
Owner 江苏耀坤液压股份有限公司
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