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A kind of flame retardant coating and preparation method thereof

A flame-retardant coating and inorganic film-forming technology, applied in coatings, fire-retardant coatings, devices for coating liquids on surfaces, etc. Low, delayed burn effect

Active Publication Date: 2018-03-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a flame-retardant coating and its preparation method, which can solve the problems of high flammability of magnesium alloys, and can be used as a decorative fire-resistant coating on metal surfaces.

Method used

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Examples

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preparation example Construction

[0025] The preparation method of described flame retardant coating, comprises the following steps:

[0026] (1) Prepare the inorganic film-forming substance, inorganic filler powder and water according to the mass ratio, water accounts for 10-30% of the total mass of the inorganic film-forming substance and inorganic filler powder, add appropriate additives as required, and fully stir and mix to form Uniform slurry;

[0027] (2) Adjust the slurry viscosity to 15s ~ 45s (coat 4 cups);

[0028] (3) Prepare a coating on the surface of metal (light alloys such as aluminum and magnesium) by dipping, brushing or spraying;

[0029] (4) Put it in an oven at 60-120°C for 2-4 hours to cure the coating, and the dry film thickness of the coating is 50-200 μm.

Embodiment 1

[0032] Mix phosphoric acid with a concentration of 50wt% and aluminum hydroxide at a mass ratio of 2:5, put it in a water bath at 80°C, and stir until the solution is completely transparent to form a phosphate adhesive for later use. Weigh and mix magnesium oxide, zinc oxide, aluminum oxide, sodium hydroxide, and boric acid in a mass ratio of 3:4:8:4:1, put them in a crucible and keep them warm at 1000°C for 3 hours, crush them after cooling, and grind them into powders. 400-mesh sieve to prepare inorganic filler powder. Weigh the phosphate adhesive, inorganic filler powder, and water in a mass ratio of 1:1:0.2, stir on a planetary ball mill for 1 hour, pour it out through a 400-mesh sieve, and add 0.2% of the total mass of inorganic film-forming substances and inorganic filler powders Antifoaming agent (such as: BYK055 inorganic silicon defoaming agent), adjust the viscosity of the emulsion to 25s with water (coat 4 cups). The coating was prepared by spraying, dried in the s...

Embodiment 2

[0034] Mix phosphoric acid with a concentration of 50wt% and aluminum hydroxide at a mass ratio of 2:3, put it in a water bath at 80°C, and stir until the solution is completely transparent to form a phosphate adhesive for later use. Weigh and mix magnesium oxide, zinc oxide, aluminum oxide, sodium hydroxide, and boric acid according to the mass ratio of 2:2:2:2:1, put them in a crucible and keep them warm at 1000°C for 3 hours, crush them after cooling, and grind them into powders, pass A 400 mesh sieve was prepared into a powder. Weigh the phosphate adhesive, inorganic filler powder, and water in a mass ratio of 1:1:0.5, stir on a planetary ball mill for 1 hour, pour it out through a 400-mesh sieve, and add 0.3% of the total mass of inorganic film-forming substances and inorganic filler powders Antifoaming agent (such as: BYK055 inorganic silicon defoaming agent), adjust the viscosity of the emulsion to 25s (coat 4 cups). The coating was prepared by spraying, dried in the s...

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PUM

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Abstract

The invention relates to the field of flame retardant coating layers, and in particular, relates to a flame retardant coating layer applicable to the surface of a magnesium alloy and other lightweight alloys and a preparation method thereof. The flame retardant coating layer comprises the main components: an inorganic film-forming substance and an inorganic filler; the mass ratio of the inorganic film-forming substance to the inorganic filler is (35-65) to (35-65), the inorganic film-forming substance is a phosphate adhesive, and the inorganic filler is composed of a metal oxide, an alkali metal hydroxide and boric acid according to the mass ratio of (55-75) to (20-35) to (5-10). The flame retardant coating layer adopts the inorganic film-forming substance and the non-combustible filler, a proper auxiliary agent is added, and a reactive principle is applied, so that the coating layer can form a non-combustible dense inorganic 'glaze film layer' under a condition of flame or high temperature, and the effect of isolating oxygen gas is achieved. The flame retardant coating layer has the advantages of low film-forming temperature and good heat resistance, cannot be burnt when meeting fire, and can form the dense 'glaze film layer'; the surface of the magnesium alloy is coated with the flame retardant coating layer, and thus the flame retardancy of the magnesium alloy can be improved.

Description

technical field [0001] The invention relates to the field of flame-retardant coatings, in particular to a flame-retardant coating suitable for the surface of light alloys such as magnesium alloys and a preparation method thereof. Background technique [0002] Magnesium alloy, as the lightest structural material, has received more and more attention, and its applications in the fields of automobiles, aerospace, and electronic communications are increasing. A breakthrough achievement in its own structure. However, in order for magnesium alloys to replace aluminum alloys and gain greater application in the aerospace field, in addition to improving some mechanical properties, the corrosion resistance and high flammability of magnesium alloys must also be solved. The flammability of magnesium alloy is much higher than that of aluminum alloy. It emits dazzling white light when burning, and the flame temperature can be as high as 3900 ° C. The development of flame-retardant magnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D7/61C09D5/18B05D7/14B05D3/02
Inventor 赵焕李庆鹏张博刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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