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A kind of micro-arc oxidation composite water-based fireproof coating and its preparation method

A technology of micro-arc oxidation and fireproof coating, which is applied in the direction of fireproof coatings, coatings, and devices for coating liquid on the surface. It can solve the problems of few researches on fire protection, achieve low production costs, high expansion ratio The effect of simple processing technology

Active Publication Date: 2019-09-06
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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  • A kind of micro-arc oxidation composite water-based fireproof coating and its preparation method
  • A kind of micro-arc oxidation composite water-based fireproof coating and its preparation method

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; water-based fire retardant coating component content (by weight): 35 parts of water; 20 parts of base material, 25 parts of dehydration carbon-forming catalyst, 15 parts of char-forming agent, foaming 15 parts of additives, 8 parts of pigments and fillers, 1 part of additives, and 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 smooth, then ultrasonically clean it with acetone for 5 minutes, then put it into the electrolyte, use the aluminum alloy as the anode, and stainless steel as the cathode; the micro-arc oxidation parameter setting: the frequency is 500Hz , the micro-arc oxidation reaction is carried out under the conditions that the mic...

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. Component content of water-based fireproof coating (by weight): 25 parts of water; 30 parts of base material, 25 parts of dehydration carbon-forming catalyst, 11 parts of char-forming agent, 12 parts of foaming agent, 5 parts of pigment and filler, and 0.8 parts of auxiliary agent part, 0.001 part of graphene oxide.

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

Embodiment 3

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

[0039] Refer to the requirements of the national standard GB / T15442.2-1995 "Fireproof Performance Classification and Test Method of Facing Fireproof Coatings Large Slab Fuel Method", simulate the large slab combustion method, carry out the combustion test on the prepared samples, and record the test time. The temperature change curve o...

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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 stiffness, and good plasticity, and are widely used in machinery, aerospace, ships and other fields. In order to improve the comprehensive properties of aluminum, titanium, magnesium and other metals and meet the strict service requirements in high temperature, high pressure, high speed and corrosive medium environments, surface treatment must be strengthened. Micro-arc oxidation is one of the most promising surface technologies for valve metals. The prepared oxidized ceramic layer has strong bonding force with the substrate, high hardness and good wear resistance. However, there are many pores and cracks o...

Claims

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Application Information

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Patent Type & Authority Patents(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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