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Low infrared emittance sheet-like pigment and method for preparing same

A low-emissivity, infrared technology, applied in fibrous fillers, inorganic pigment treatment, chemical instruments and methods, etc., can solve the problems of unfavorable visible light invisibility, poor oxidation resistance of aluminum flakes, limitations of metal aluminum powder, etc., and achieve good multi-band Stealth compatible foundation, low emissivity, good oxidation resistance

Inactive Publication Date: 2009-08-05
SHANGHAI HUAMING HI TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of aluminum flakes, the reflection of the coating on visible light is enhanced, and it is difficult to integrate with the background, which is not conducive to invisible light stealth; at the same time, the oxidation resistance of aluminum flakes is poor, and it is easy to oxidize when exposed to air for a long time. Greatly increased, the existence of these unfavorable factors has greatly restricted the practical application of metal aluminum powder

Method used

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  • Low infrared emittance sheet-like pigment and method for preparing same

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Effect test

Embodiment 1

[0028] Weigh 13.9gFeSO 4 ·7H 2 O, dissolved in water and diluted to 1L, weighed 4gNaOH dissolved in water and diluted to 500ml; 4 Pour the solution into a 2L reaction kettle, then put 20g of flake aluminum powder into it, stir, and heat the reaction kettle with a hot water jacket; The peristaltic pump controls the dropping rate of the NaOH solution to keep the pH value of the reaction solution at 5; when the pH value reaches 3.5, use an air compressor to feed air, and the air flow rate is controlled at 500ml / min; during the reaction, every hour Take a sample once, titrate and measure Fe with potassium dichromate standard solution 2+ The concentration of Fe 2+ When the concentration is less than 0.003mol / L, adjust the pH to 6.0 and stop feeding air. Suction filtration, washing, and drying at 115° C. to obtain about 40 g of flaky aluminum powder coated with iron yellow on the surface.

[0029] The color is khaki, dull, using the IR-1 infrared emissivity tester produced by t...

Embodiment 2

[0031] Weigh 69.5gFeSO 4 ·7H 2 O, dissolved in water and diluted to 1L, prepare 500ml of aqueous ammonia solution with a concentration of 1.0mol / L for subsequent use; FeSO 4 Pour the solution into a 2L reaction kettle, then put in 30g of flake aluminum powder with an average particle size of 40μm, stir, and heat the reaction kettle with a constant temperature tank water bath; when the temperature rises to the set temperature of 50°C, add a molar concentration of 1.0mol / L Aqueous ammonia solution, control the drip rate of aqueous ammonia solution with peristaltic pump, make the pH value of reaction solution remain on 4.5; When pH value reaches 3.5, pass into air with air compressor, air flow is controlled at 500ml / min; , take a sample every one hour, titrate and measure Fe with potassium dichromate standard solution 2+ The concentration of Fe 2+ When the concentration is less than 0.003mol / L, adjust the pH to 6.0 and stop feeding air. Suction filtration, washing, and drying...

Embodiment 3

[0033] Weigh 20gFeCl 2 4H 2 O, dissolved in water and diluted to 1L, weighed 53gNa 2 CO 3 Dissolve and dilute to 500mL with water; FeCl 2 Pour the solution into a 2L reaction kettle, then put in 20g of flake aluminum powder with an average particle size of 20μm, stir, and heat the reaction kettle with a constant temperature tank water bath; when the temperature rises to the set temperature of 40°C, add carbonic acid with a mass concentration of 10.6 Sodium aqueous solution, control Na with peristaltic pump 2CO 3 The drop rate of the aqueous solution keeps the pH value of the reaction solution at 4; when the pH value of the reaction solution reaches 4, air is introduced with an air compressor, and the air flow rate is controlled at 500mL / min; during the reaction, samples are taken every hour Once, measure Fe by titration with potassium dichromate standard solution 2+ The concentration of Fe 2+ When the concentration is less than 0.003mol / L, adjust the pH to 6 and stop fe...

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Abstract

The invention discloses a flaky aluminum powder pigment whose surface is coated with hydrated iron oxide (iron yellow) and has a low emissivity in the infrared band and a preparation method thereof. The surface-coated iron yellow flaky aluminum powder with low emissivity in the infrared wave band of the present invention has an average particle diameter of 1-100 μm, is dull, earthy yellow, and has excellent oxidation resistance. The average emissivity of the infrared band (wavelength 8-14 μm) is 0.50-0.60, which can be widely used in the field of infrared camouflage and photoelectric stealth engineering of weapons and equipment.

Description

technical field [0001] The invention relates to a flaky pigment with low infrared emissivity and a preparation method thereof, in particular to a pigment composed of flaky aluminum powder and a coating of monohydrated ferric oxide wrapped outside it. Background technique [0002] Infrared stealth technology is an infrared target control technology developed for infrared imaging, infrared guidance and infrared reconnaissance. [0003] Infrared stealth material is a high-tech military material that emerged in the middle and late 20th century. It is used to make infrared stealth coatings or infrared camouflage stealth barriers with different infrared emissivity, which can be used for military targets to achieve stealth. [0004] Optical studies have shown that the higher the reflectivity of opaque objects, the lower the emissivity, so metals with higher reflectivity are the most important pigment types in infrared stealth paints. In fact, the most widely used is metal aluminum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/06C09C1/40
Inventor 於定华马新胜李福清吴秋芳汪中进
Owner SHANGHAI HUAMING HI TECH GRP
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