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Anti-thick coating pinhole, excellent acid and alkali resistance powder coating and preparation method thereof

A technology of acid and alkali resistance and powder coating, which is applied in the direction of powder coating, polyether coating, anti-corrosion coating, etc. It can solve the problems of unsatisfactory acid and alkali resistance and high cost of polyester resin, and overcome the poor acid and alkali resistance , reduce consumption and reduce cost

Active Publication Date: 2021-11-30
安徽鑫友高分子新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Most acid and alkali resistant powder coatings use epoxy resin or polyester resin as raw material, but the acid and alkali resistance of polyester resin is not ideal, or the cost is high

Method used

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  • Anti-thick coating pinhole, excellent acid and alkali resistance powder coating and preparation method thereof
  • Anti-thick coating pinhole, excellent acid and alkali resistance powder coating and preparation method thereof
  • Anti-thick coating pinhole, excellent acid and alkali resistance powder coating and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The preparation method of the powder coating with anti-thick coating pinhole and excellent acid and alkali resistance comprises the following steps:

[0057] S1: Weigh the material into the high-speed mixer according to the following formula, start the mixing device, and mix at high speed for 10-25 minutes;

[0058] S2: After the materials in S1 are mixed evenly, put them into a twin-screw extruder for melt extrusion, the temperature of the extrusion section is 130-140°C, and the screw speed is 360-380rpm;

[0059] S3: Use a twin-screw extruder to melt the material extruded in S2, and then use a tablet press with a tap water cooling system to tablet the melted material and roughly break it into granules;

[0060] S4: The coarse particles are further ground through the mill, and the particles with a particle size of 160-180 mesh are screened and collected through the air induction system of the mill to obtain the finished powder coating.

[0061] Wherein, the hydroxyl p...

Embodiment 5

[0079] Coating coating preparation: Spray the prepared powder coating on the surface-treated tinplate substrate with an electrostatic spray gun, with a film thickness of about 150 μm, and fully cure at 175°C / 15min to obtain the coating coating.

[0080] Coating index detection is based on GB / T 21776-2008 "Guidelines for Testing Standards of Powder Coatings and Coatings"; coating film leveling level testing is based on JB / T 3998-1999 "Determination of Coating Leveling and Scratching"; attached The level of stress is based on GB / T9286-1998 "Cross-cut test of paint and varnish film"; the acid and alkali corrosion resistance is in accordance with the standard of GB / T 9274-1988 "Determination of resistance to liquid media of paint and varnish" Soaking method) is carried out, test according to the acid-base concentration of commonly used industrial cleaning, adopt respectively the hydrochloric acid solution of 5% mass concentration, the phosphoric acid solution of 10% mass concentrat...

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Abstract

The invention belongs to the technical field of powder coatings, and in particular relates to a powder coating with excellent pinhole resistance and acid and alkali resistance and a preparation method thereof. The parts by weight of the main raw materials of the powder coating of the present invention are: 530-550 parts of hydroxyl polyether resin, 40-50 parts of B1530 curing agent, 150-200 parts of talcum powder, 120-150 parts of barium sulfate, 8-12 parts of brightening agent Parts, 7-10 parts of leveling agent; Hydroxy polyether resin is prepared by polycondensation of materials with the following molar fractions: the molar fractions of each component are: 1,4-cyclohexanedimethanol 4-8 , 1,6-hexanediol 3-6, resorcinol diglycidyl ether 5-10, propylene oxide 30-45, triglycidyl isocyanurate 4-8, octyl glycidyl ether 6-13 . The present invention uses high-functionality hydroxyl polyether resin as the raw material, the hydroxyl value is 15-20mgKOH / g, the amount of B1530 curing agent required for curing is small, the cost of powder coating is low, and it can be cured at 175°C / 15min at low temperature, and The prepared coating film has good resistance to pinholes in thick coating, and the high-functionality polyether has excellent acid and alkali resistance, and can be used for coating metal facilities in industrial cleaning places.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, and in particular relates to a powder coating with excellent pinhole resistance and acid and alkali resistance and a preparation method thereof. Background technique [0002] Powder coatings are widely used in the surface coating of household appliances, automobile industry, chemical tanks and other fields due to their advantages of no pollution, saving energy and resources, high mechanical strength of the coating film and complete recovery of excess coating. [0003] In the process of industrial cleaning, the metal is generally pickled, alkali washed and washed before electroplating, and the edges of the pickling pool and the alkali washing pool are generally painted with powder coating. When the workpiece is taken out, there will generally be The acid or lye is taken out of the pool and falls on the powder coating. Since the polyester powder coating is a coating film obtained by curing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D171/02C09D5/03C09D5/08C08G65/28
CPCC08G65/2606C08G65/2609C08K2003/3045C09D5/033C09D5/08C09D171/02C08K13/02C08K3/34C08K3/30
Inventor 陈君徐友楼鲍文鑫吴有军
Owner 安徽鑫友高分子新材料科技有限公司
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