Polytetrafluoroethylene modified chromium-free Dacromet paint and preparation method of composite coating thereof

A polytetrafluoroethylene, modified technology, applied in coatings, anti-corrosion coatings, devices for coating liquid on the surface, etc., can solve the problems of poor corrosion resistance of coatings, environmental and human hazards, and inability to effectively protect substrates. Material and other issues, to achieve excellent corrosion resistance and thermal shock resistance, stable coating performance

Inactive Publication Date: 2015-11-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The binder in the traditional Dacromet coating solution is chromic anhydride or chromate, and the Dacromet coating solution contains 2% to 5% Cr 6+ , even after high temperature sintering, there is still a small amount of soluble Cr 6+ stay in the coating, Cr 6+ It is highly toxic and carcinogenic, and has certain harm to the environment and human body. It is a dangerous environmental pollutant
[0009] At present, some researchers use sodium molybdate, phosphate, organic resin and other substances instead of chromic anhydride to prepare chromium-free dacromet coating liquid, but the corrosion resistance of the coating prepared by these chromium-free dacromet coating liquid is not good. Does not effectively protect substrates at high temperatures

Method used

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  • Polytetrafluoroethylene modified chromium-free Dacromet paint and preparation method of composite coating thereof
  • Polytetrafluoroethylene modified chromium-free Dacromet paint and preparation method of composite coating thereof
  • Polytetrafluoroethylene modified chromium-free Dacromet paint and preparation method of composite coating thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Ingredients: Take 8.0 kg of metal paste [which contains 33% flake zinc powder, 33% flake aluminum powder, 34% magnesium powder, a total of 4.0 kg, and an equivalent amount of polyethylene glycol 400 (ie 4.0 kg)] . Take 1.0 kg of chromium-free passivation agent [which contains 40% ammonium molybdate, 15% citric acid, 15% boric acid, 10% silane coupling agent (KH-560), 20% rare earth material (terbium oxide)], take water Add 6.6 kg into the weighed chromium-free passivating agent and stir to obtain the chromium-free passivating solution. Pour the metal slurry and chromium-free passivation solution into a polyethylene bucket and mix evenly, then stir at a constant speed, add 100 grams of HEC thickener (hydroxymethyl cellulose), 1.4 kilograms of polytetrafluoroethylene suspension [such as : JF-4DC polytetrafluoroethylene suspension produced by Zhejiang Juhua Group] and 80 grams of dispersant (sodium dodecylbenzene sulfonate) and 50 grams of ethylene glycol (related additiv...

Embodiment 2

[0058] Ingredients: Take 7.2 kg of metal paste [which contains 20% flake zinc powder, 40% flake aluminum powder, 40% magnesium powder, a total of 3.6 kg, and an equivalent amount of polyethylene glycol 400 (ie 3.6 kg)] . Take 1.3 kg of chromium-free passivation agent [which contains 38% ammonium molybdate, 15% citric acid, 16% boric acid, 6% silane coupling agent (KH-560), 25% rare earth material (cerium oxide)], take water 7.0 kg was poured into the weighed chromium-free passivation agent and stirred to obtain the chromium-free passivation solution. Pour the metal paste and chromium-free passivation solution into polyethylene barrels and mix evenly, then stir at a constant speed, add 90 grams of HEC thickener (hydroxymethyl cellulose), 2.0 kilograms of polytetrafluoroethylene suspension and 75 gram dispersant (sodium dodecylbenzene sulfonate) and 50 gram ethylene glycol (related auxiliary). Stir rapidly at room temperature for 7 hours. During this continuous stirring proces...

Embodiment 3

[0063] Ingredients: take 8.6 kg of metal paste [among them, the weight of flake zinc powder, flake aluminum powder, and magnesium powder each accounts for 1 / 3, a total of 4.3 kg; and the same amount of polyethylene glycol 400 (ie 4.3 kg) 】. Get 1.4 kg of chromium-free passivating agent [which contains 35% ammonium molybdate, 15% citric acid, 15% boric acid, 12% silane coupling agent (KH-560), 23% rare earth material (lanthanum nitrate)], take Pour 6.8 kg of water into the weighed chromium-free passivation agent and stir to obtain the chromium-free passivation solution. Pour the metal slurry and chromium-free passivation solution into polyethylene barrels and mix them evenly, then stir at a constant speed, add 95 grams of HEC thickener (hydroxymethyl cellulose), 1.5 kilograms of polytetrafluoroethylene suspension and 80 gram of dispersant (sodium dodecylbenzenesulfonate) and 55 grams of ethylene glycol (associated additives). Stir rapidly at room temperature for 7.5 hours. Du...

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Abstract

The invention relates to a polytetrafluoroethylene modified chromium-free Dacromet paint and preparation of composite coating thereof. The paint is characterized by comprising the following components in percentage by weight: 20 to 30% of metal powder, 20 to 30% of wetting agent, 5 to 10% of chromium-free passivating agent, 33 to 49% of water, 5 to 11.3% of polytetrafluoroethylene suspension, and 1 to 2% related auxiliary agents; wherein the metal powder and wetting agent form metal slurry. The surface of composite coating is protected by SiO2 sol / gel modified polytetrafluoroethylene suspension. The provided paint is more stable than common chromium-free Dacromet paints, and the composite coating has an excellent corrosion resistant and thermal shock resistant performance.

Description

technical field [0001] The invention relates to the preparation of a polytetrafluoroethylene-modified chromium-free dacromet coating and the preparation of the composite coating. Background technique [0002] Dacromet technology was developed by Dayang Company of the United States in 1963. Dacromet coating raw materials are composed of flake zinc powder, flake aluminum powder, chromic anhydride, wetting agent, dispersant, reducing agent, deionized water and The mixed solution composed of other additives is stirred evenly to obtain the coating solution, which is applied to the surface of the workpiece, and after baking at about 300 ° C, a layer of excellent corrosion resistance coating is formed on the surface of the metal substrate. Dacromet coating is mainly composed of flaky zinc powder and aluminum powder in the coating liquid, which are regularly superimposed on the surface of the fastener to form a film. The chromic acid in the coating liquid and the reducing agent unde...

Claims

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Application Information

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IPC IPC(8): C09D127/18C09D5/10C09D7/12B05D7/24B05D3/02
Inventor 程旭东李邦
Owner WUHAN UNIV OF TECH
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