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Powder coating capable of being thin coated and preparation process thereof

A powder coating and thin coating technology, applied in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of low surface gloss, poor leveling, and poor surface leveling of the coating film, and achieve pigment hiding power. Good results

Inactive Publication Date: 2009-09-02
黄山华佳表面科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lucarelli et al. use the method of adding 0.1-2% fluidization enhancer agent (USP6228927), but the surface gloss of the coating film is low, and the leveling is still not good
Guo Lixiao and others chose a special process to add a flow promoter (CN 1706891) to solve the problem of too thick coating and poor surface leveling, but the equipment and process involved are complicated, which greatly limits its application
In addition, when using the current electrostatic spraying equipment to spray ultra-fine powder, it will have an enveloping effect on the workpiece, so that both sides of the workpiece are coated with powder, which is not conducive to the coating of the workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The production process of powder coatings includes the following steps in sequence:

[0049] a) Mixing process: Weigh 60 parts by weight of polyester resin, TGIC of 4.5 parts by weight, dispersive flow control agent of 1 part by weight, Resiflow P67 of 1 part by weight, benzoin of 0.4 parts by weight, R706 of 30 parts by weight, The Blanefix of 10 parts by weight is mixed for 1min using a high-speed mixer (Zhangjiagang Songyou Machinery Co., Ltd.);

[0050] b) Melt extrusion process: use the co-rotating twin-screw extruder for the mixed materials in the mixing process, and control the extrusion temperature to 50°C;

[0051] c) Fine crushing process: the extruded material is crushed using an air classification (ACM) mill, the speed of the grinding disc is controlled at 3500-4500rpm, and the speed of the classifier is controlled at 1800-2500rpm;

[0052] d) Micropowder removal process: use a cyclone separator to remove the micropowder in the pulverized material;

[0053...

Embodiment 2

[0055] The production process of powder coatings includes the following steps in sequence:

[0056] a) Mixing process: Weigh 55 parts by weight of polyester resin, TGIC of 4.2 parts by weight, dispersed flow control agent of 1.2 parts by weight, Resiflow P67 of 1 part by weight, benzoin of 0.3 parts by weight, R706 of 20 parts by weight, 20 parts by weight of Blanefix, mixed for 2 minutes using a high-speed mixer;

[0057] b) Melt extrusion process: use a co-rotating twin-screw extruder for the mixed materials in the mixing process, and control the extrusion temperature to 80°C;

[0058] c) Fine crushing process: the extruded material is crushed using an air classification (ACM) mill, the speed of the grinding disc is controlled at 3500-4500rpm, and the speed of the classifier is controlled at 1800-2500rpm;

[0059] d) Micropowder removal process: use a cyclone separator to remove the micropowder in the pulverized material;

[0060] e) Sieving process: use a rotary sieve with ...

Embodiment 3

[0062] The production process of powder coatings includes the following steps in sequence:

[0063] a) Mixing process: Weigh 70 parts by weight of polyester resin, 4.6 parts by weight of TGIC, 1.2 parts by weight of dispersed flow control agent, 0.9 parts by weight of Resiflow P67, 0.5 parts by weight of benzoin, 0.6 parts by weight of BP- 120, the Blanefix of 20 weight parts, the stearic acid of 1 weight part, use high-speed mixer to mix 4min;

[0064] b) Melt extrusion process: use the co-rotating twin-screw extruder for the mixed materials in the mixing process, and control the extrusion temperature to 100°C;

[0065] c) Fine crushing process: the extruded material is crushed using an air classification (ACM) mill, the speed of the mill is controlled at 3500-4500rpm, and the speed of the classifier is controlled at 1800-2500rpm;

[0066] d) Micropowder removal process: use a cyclone separator to remove the micropowder in the pulverized material;

[0067] e) Sieving proces...

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Abstract

The invention discloses a powder coating capable of being thin coated and a preparation process thereof. The powder coating comprises 50 to 95 weight parts of binder, 0 to 2 weight parts of dispersed flowing control agent, 0 to 3 weight parts of addition agent, 0 to 45 weight parts of tinting pigment and 0 to 20 weight parts of filling, and the binder is the gross of resin and a relative firming agent. The preparation process comprises a mixing working procedure, a melting extrusion working procedure, a finely pulverizing working procedure, a fine powder removing working procedure and a screening working procedure. Compared with the prior art, the high surface property powder coating capable of being thin coated can be prepared by the selection of the binder and the dispersed flowing control agent and the easy and practical production process, not only can obtain a neat smooth high-performance coating with the surface thickness of 40 microns to 50 microns and good color covering power, but also is beneficial to the electrostatic coating of working pieces.

Description

technical field [0001] The invention relates to a coating and its preparation process, in particular to a powder coating capable of thin coating and the preparation process of the coating. Background technique [0002] As a new type of environmentally friendly coating material, powder coating is expanding its application field. The use of powder coatings instead of solvent-based coatings is a trend in the future. But at present, compared with solvent-based coatings, powder coatings still have some limitations in their application fields. For example, in order to ensure the surface leveling and color hiding power of the coating film, the powder coating must make the coating film reach a certain thickness, so it cannot be used like a solvent. High-performance coating surfaces can be obtained at thinner coating thicknesses like type coatings. It is generally believed that this defect of powder coatings is caused by the particle size of powder coatings being too large. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/03C09D167/00C09D163/00C09D133/02C09D175/04C09D7/12
Inventor 潘向东郑德宝汪鹏陈小艳代孟元
Owner 黄山华佳表面科技有限公司
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