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Micro-arc oxidation composite aqueous fire retardant coating and preparation method thereof

A technology of micro-arc oxidation and fire-resistant coating, applied in fire-resistant coatings, coatings, devices for coating liquids on surfaces, etc. High magnification effect

Active Publication Date: 2018-03-20
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing fire retardant coatings are mainly suitable for fire protection of steel structures, wood, plastics, etc., and there are very few studies on fire protection of valve metals such as aluminum, magnesium, titanium and their alloys

Method used

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  • Micro-arc oxidation composite aqueous fire retardant coating and preparation method thereof
  • Micro-arc oxidation composite aqueous fire retardant coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The base material is 6063 aluminum alloy; the composition of the electrolyte used in the micro-arc oxidation method is: 10g / L Na 2 SiO 3 , 10g / LNa 3 PO 4 , 5g / L (NaPO 3 ) 6 , 2g / L NaF, the solvent is deionized water; the content of water-based fireproof coating components (in parts by weight): 35 parts of water; 20 parts of base material, 25 parts of dehydration carbon catalyst, 15 parts of carbon former, foaming 15 parts of agent, 8 parts of pigments and fillers, 1 part of auxiliary agent, 0.01 parts of graphene oxide.

[0021] Preparation of the micro-arc oxidation film layer: polish the 6063 aluminum alloy plate until the surface is smooth and clean with acetone ultrasonic for 5 minutes, then put it in the electrolyte, use aluminum alloy as anode and stainless steel as cathode; micro-arc oxidation parameter setting: frequency is 500Hz , The micro-arc time is 30min, the duty ratio is 10%, the voltage is 480V, the electrolyte temperature is 20-50℃, and the operating temper...

Embodiment 2

[0029] The base material is 6063 aluminum alloy; the composition of the electrolyte used in the micro-arc oxidation method is: 10g / L Na 2 SiO 3 , 10g / LNa 3 PO 4 , 5g / L (NaPO 3 ) 6 , 2g / L NaF, the solvent is deionized water. The content of water-based fireproof coating components (in parts by weight): 25 parts of water; 30 parts of base material, 25 parts of dehydration carbon catalyst, 11 parts of carbon former, 12 parts of foaming agent, 5 parts of pigments and fillers, and 0.8 parts of additives Parts, 0.001 parts of graphene oxide.

[0030] Preparation of the micro-arc oxidation film layer: polish the 6063 aluminum alloy plate until the surface is smooth and clean with acetone ultrasonic for 5 minutes, then put it in the electrolyte, use aluminum alloy as anode and stainless steel as cathode; micro-arc oxidation parameter setting: frequency is 500Hz , The micro-arc time is 30min, the duty ratio is 10%, the voltage is 480V, the electrolyte temperature is 20~50℃, and the operati...

Embodiment 3

[0038] In order to compare the fireproof and heat insulation performance of the micro-arc oxidation composite water-based fire-retardant coating prepared by the present invention and a single water-based fire-retardant coating, this Example 3 did not perform micro-arc oxidation on the aluminum alloy in advance, but directly brushed the water-based fire-retardant coating. The coating method is applied to the aluminum alloy substrate, and a single water-based fire-resistant coating is prepared after drying; the water-based fire-resistant coating composition is the same as the preparation method and Example 2, as a comparison.

[0039] Refer to the requirements of the national standard GB / T15442.2-1995 "Classification and Test Method for Fire Resistance of Finished Fireproof Coatings and Large Plate Fuel Method", simulate the large plate combustion method, conduct a combustion test on the prepared sample, and record the aluminum alloy during the test The temperature change curve of t...

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Abstract

The invention discloses a micro-arc oxidation composite aqueous fire retardant coating and a preparation method thereof. A micro-arc oxidization film layer is formed on the surface of a valve metallicmatrix by using a micro-arc oxidation method by adopting alkaline electrolyte, and then an aqueous fire retardant coating is compounded on the surface of the micro-arc oxidization film layer, whereinthe coating takes ammonium polyphosphate, pentaerythritol and melamine as a flame-retardant system, titanium dioxide as a pigment filler, and water as a solvent. When meeting fire, the flame-retardant system of the aqueous fire retardant coating on the outer layer achieves concerted reaction to form a dense spongy expanded carbonaceous layer, a two-dimensional lamellar structure of graphene oxideundergoes multilayer stacking in the carbonaceous layer to form a dense physically blocked layer so as to isolate transfer of outside heat to the inner layer, while the heat conductivity of the micro-arc oxidization film layer on the inner layer is low, so as to further isolate transfer of the heat to the matrix. The micro-arc oxidation composite aqueous fire retardant coating has excellent fireretardant and heat insulating performances, is applicable to valve metals of aluminum, magnesium, titanium and the like, and is strong in binding force, simple and environment-friendly in processing technology and low in cost.

Description

Technical field [0001] The invention relates to the technical field of fireproof coatings, in particular to a micro-arc oxidation composite water-based fireproof coating and a preparation method thereof. Background technique [0002] Valve metals such as aluminum, titanium, magnesium and their alloys have the advantages of low density, high specific strength and specific rigidity, and good plasticity. They are widely used in the fields of machinery, aerospace, and ships. In order to improve the comprehensive performance of aluminum, titanium, magnesium and other metals, and meet the strict service requirements under high temperature, high pressure, high speed and corrosive media environment, it must be strengthened by surface treatment. Micro-arc oxidation is one of the most promising surface technologies for valve metals. The prepared oxide ceramic layer has strong bonding force with the substrate, high hardness, and good wear resistance. However, there are many pores and crack...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/04C09D5/18C09D7/63C09D7/61C09D7/65B05D5/00B05D7/14B05D7/24
Inventor 李伟洲杨海娟陈泉志谷凤媚陆珊柔蒋智秋黄德宇
Owner GUANGXI UNIV
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