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Composite coating layer for eliminating heavy metal chromium and VOCs pollution from source, and preparation method thereof

A composite coating, source technology, applied in the direction of metal material coating process, coating, powder coating, etc., can solve the problem that the performance of aluminum and aluminum alloy materials cannot meet the application requirements, the thickness of fluorocarbon powder is high, and the leveling performance Bad etc.

Active Publication Date: 2020-06-02
GUANGDONG PROVINCIAL ACAD OF BUILDING RES GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application CN106833165A uses FEVE fluorocarbon resin as the base material to prepare a super weather-resistant pure fluorocarbon powder coating on aluminum surface. By combining with traditional chromate conversion coating, it can improve the weather resistance of the coating and overcome the fluorocarbon Poor adhesion and impact resistance of powder coatings
Chinese patent application CN107502081A discloses a high-performance FEVE fluorocarbon powder coating and its preparation method. It is electrostatically sprayed on the surface of the traditional chromate conversion film, which ensures excellent weather resistance and overcomes the high thickness requirements of fluorocarbon powder. Defects of poor leveling performance
[0016] ①Choose traditional chromate conversion coating for pretreatment, powder fluorocarbon coating and chromate conversion coating show good compatibility, but this method will bring pollution problems of chromium-containing wastewater;
[0017] ② Coating a layer of acrylic resin as a "primer" on the surface of the film formed by "chrome-free" pretreatment, and then spraying powder-type fluorocarbon coating, but this method not only complicates the coating process, but also makes the fluorocarbon coating The performance is greatly reduced;
[0018] ③Traditional solvent-based fluorocarbon coatings are used, but this method is accompanied by the pollution of VOCs
[0019] The above compromise methods may require sacrificing the performance of the coating, so that the performance of aluminum and aluminum alloy materials cannot meet the application requirements; or generate chromium wastewater / or VOCs that pollute the environment, so that the chromium-containing wastewater can be eliminated from the source at the same time. The ideal effect of eliminating VOCs cannot be achieved

Method used

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  • Composite coating layer for eliminating heavy metal chromium and VOCs pollution from source, and preparation method thereof
  • Composite coating layer for eliminating heavy metal chromium and VOCs pollution from source, and preparation method thereof
  • Composite coating layer for eliminating heavy metal chromium and VOCs pollution from source, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Composite coatings were prepared using the following methods:

[0094] (1) Etching treatment is carried out on the metal surface to be treated, and the etching amount is 1.2g / m 2 ;

[0095] (2) Spray the surface pretreatment liquid evenly on the surface of the metal to be treated, the spray pressure is 0.03MPa, and the treatment time is 20s to form a conversion film layer. The surface pretreatment liquid includes the following components by weight percentage: 2, 4,6-trihydroxybenzoic acid 0.3mmol / L, sodium fluorozirconate 0.5mmol / L, dilute sulfuric acid solution of manganese fluoride dihydrate 0.1mmol / L, potassium fluoride 0.1mmol / L, maleic acid di Sodium isooctyl sulfonate 6×10 -6 mmol / L, adjust the pH to 4.2;

[0096] (3) Carry out drying treatment on the conversion coating layer, the temperature is controlled at 80° C., and dried for 20 minutes;

[0097] (4) With the conversion film layer as the transition layer, use the method of electrostatic spraying to spray ...

Embodiment 2

[0100] Composite coatings were prepared using the following methods:

[0101] (1) Etching treatment is carried out on the metal surface to be treated, and the etching amount is 1.5g / m 2 ;

[0102] (2) Soak the metal to be treated in the surface pretreatment solution for 12 minutes to form a conversion film layer. The surface pretreatment solution includes the following components by weight percentage: 1.0mmol / L of 3,4,5-trihydroxybenzoic acid, fluorine Titanic acid 0.3mmol / L, dilute sulfuric acid solution of manganese fluoride dihydrate 0.5mmol / L, potassium sulfate 0.2mmol / L, diisooctyl ammonium maleate 2×10 -6 mmol / L, adjust the pH to 2.6;

[0103] (3) Carry out drying treatment on the conversion coating layer, the temperature is controlled at 100° C., and dried for 10 minutes;

[0104] (4) With the conversion film layer as the transition layer, spray fluorocarbon powder coating with 80% FEVE resin content on its surface by electrostatic spraying method to form the coating...

Embodiment 3

[0107] Composite coatings were prepared using the following methods:

[0108] (1) Etching treatment is carried out on the metal surface to be treated, and the etching amount is 1.3g / m 2 ;

[0109] (2) The surface pretreatment liquid is evenly coated on the surface of the metal to be treated, and the treatment time is 20s to form a conversion film layer. The surface pretreatment liquid includes the following components by weight percentage: 3,4,5-trihydroxybenzene Formaldehyde 0.2mmol / L, ammonium fluorozirconate 0.1mmol / L, dilute sulfuric acid solution of manganese fluoride dihydrate 0.3mmol / L, potassium hexafluorochlorate 0.5mmol / L, diisooctyl maleate sodium sulfonate 4 ×10 -6 mmol / L, adjust the pH to 3.0;

[0110] (3) Carry out drying treatment on the conversion coating layer, the temperature is controlled at 120° C., and dried for 15 minutes;

[0111] (4) With the conversion film layer as the transition layer, use the method of electrostatic spraying to spray fluorocarbo...

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Abstract

The invention discloses a composite coating layer for eliminating chromium and VOCs pollution from the source. The composite coating layer comprises a conversion film layer and a coating surface layer; the conversion film layer is prepared from a surface pretreatment solution, and the surface pretreatment solution comprises: an organic compound A with an aromatic ring and at least two phenolic hydroxyl groups in molecules, or a hydrate thereof; an ionic compound B containing zirconium and / or titanium and fluorine elements; a mixed solution C containing manganese fluoride; and an inorganic saltD containing potassium ions or sodium ions; and the coating surface layer is an FEVE type fluorocarbon powder coating layer. The composite coating layer has excellent impact resistance, weather resistance and chemical reagent resistance, the pollution problem of heavy metal chromium and VOCs is eliminated from the source at the same time, and the composite coating layer is green and environmentally friendly. The invention further discloses a preparation method of the composite coating layer.

Description

technical field [0001] The invention belongs to the scientific and technical field of heavy metal and air pollution control, and specifically relates to a composite coating and a preparation method for eliminating heavy metal chromium and VOCs pollution from the source. Background technique [0002] Heavy metal chromium, especially hexavalent chromium, is a highly toxic pollutant. The National Poison Administration of the United States has concluded through experiments that drinking water containing hexavalent chromium can cause cancer in experimental mice. Another study also showed that: ① workers who have been exposed to hexavalent chromium for a long time are more likely to suffer from gastric cancer; More serious hazards; ③ Inhalation of hexavalent chromium in the air can lead to lung cancer. Because hexavalent chromium is extremely harmful, it has aroused great attention to the control of chromium pollution all over the world. [0003] At present, the treatment metho...

Claims

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Application Information

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IPC IPC(8): C09D127/12C09D5/03C09D5/08C09D1/00C09D7/63C23C26/00
CPCC09D127/12C09D5/03C09D5/08C09D1/00C09D7/63C23C26/00B05D1/06B05D3/0254B05D3/102B05D7/14B05D2202/25B05D2506/10C23C22/34C23C22/78C23C22/83
Inventor 张凯杨仕超马扬
Owner GUANGDONG PROVINCIAL ACAD OF BUILDING RES GRP CO LTD
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