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Low-infrared-emissivity composite pigment and preparation method thereof

A technology with low infrared emission and infrared emissivity, which is applied in the field of energy-saving and environmentally friendly coating materials, low infrared emissivity composite pigments and its preparation, can solve the problems of poisonous metal oxides, easy pollution of the environment, and corrosion of aluminum powder. Achieve the effect of little harm to the human body, good thermal stability, and no pollution to the environment

Inactive Publication Date: 2015-11-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the infrared emissivity of these materials is relatively high, and some of the metal oxides are toxic and easy to pollute the environment. There are few reports on the use of bismuth oxide, which has a relatively low infrared emissivity and is non-toxic and environmentally friendly, as coated particles.
Because in the water phase environment, not only the aluminum powder will be corroded, but also the bismuth salt is easily hydrolyzed, so it is difficult to use the water phase reaction environment to realize the coating of bismuth oxide on the aluminum sheet
In the oil phase reaction environment, the preparation process and reaction device are complicated and the cost is high

Method used

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  • Low-infrared-emissivity composite pigment and preparation method thereof
  • Low-infrared-emissivity composite pigment and preparation method thereof
  • Low-infrared-emissivity composite pigment and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Bi(NO) 3． 5H 2 O as the solute, ethylene glycol as the solvent, formulated into Bi 3+ A bismuth nitrate solution with a concentration of 0.20 mol / L, to which a dispersant and aluminum powder are added, and the dispersant is sodium lauryl sulfate. The dispersant that adds in every liter of solvent is 0.5g, and the mol ratio of described solute and aluminum powder is 0.1:1, and the weak base solution that pH is 9 is added dropwise at a constant speed with the drip rate of 1.5ml / min after ultrasonic dispersion makes Bi in the reaction solution 3+ All precipitation; the alkaline solution is ammonia water, and the constant temperature of the reaction system is controlled at 30 degrees.

[0035] (2) Suction filtration after the reaction is completed, the filter residue is dried, and the precursor powder is obtained after grinding;

[0036] (3) Put the obtained precursor powder into a muffle furnace for calcination at 400° C. for 2 h, and obtain a low-infrared emissivi...

Embodiment 2

[0040] (1) Bi(NO) 3． 5H2O as the solute, ethylene glycol as the solvent, prepared Bi 3+ Concentration is the bismuth nitrate solution of 0.05mol / L, adds dispersing agent, aluminum powder wherein, the dispersing agent added in every liter of solvent is 0.7g, and described dispersing agent is sodium lauryl sulfate. The mol ratio of described solute and aluminum powder is 0.4:1, after ultrasonic dispersion, the weak base solution that pH value is 9 is added dropwise at a constant speed with the drip rate of 0.2ml / min to make the Bi in the reaction solution 3+ All precipitated; the alkaline solution is sodium hydroxide solution. In the step (1), the constant temperature of the reaction system is controlled at 60 degrees.

[0041] (2) Suction filtration after the reaction is completed, the filter residue is dried, and the precursor powder is obtained after grinding;

[0042] (3) Put the obtained precursor powder into a muffle furnace for calcination at 450° C. for 3 h, and obtai...

Embodiment 3

[0046] (1) Bi(NO) 3． 5H 2 O as the solute, ethylene glycol as the solvent, formulated into Bi 3+ Concentration is the bismuth nitrate solution of 0.1mol / L, adds dispersant, aluminum powder wherein, the dispersant that adds in every liter of solvent is 0.6g, and described dispersant is sodium lauryl sulfate. The mol ratio of described solute and aluminum powder is 0.2:1, after ultrasonic dispersion, the weak base solution that pH value is 8 is added dropwise at a constant speed with the drip rate of 0.5ml / min to make the Bi in the reaction solution 3+ All precipitated; the alkaline solution is ammonia water. The temperature of the reaction system was controlled at 40°C.

[0047] (2) Suction filtration after the reaction is completed, the filter residue is dried, and the precursor powder is obtained after grinding;

[0048] (3) Put the obtained precursor powder into a muffle furnace for calcination at 400° C. for 2 h, and obtain a low-infrared emissivity composite pigment af...

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Abstract

The invention provides a low-infrared-emissivity composite pigment and a preparation method thereof. The method comprises the following steps: preparing a bismuth nitrate solution by using Bi(NO)3.5H2O as a solute and ethylene glycol as a solvent, adding a dispersing agent and aluminum powder, carrying out ultrasonic dispersion, and dropwisely adding a weak alkali solution at uniform speed; after the reaction finishes, collecting the precipitate, drying, and grinding to obtain precursor powder; and calcining the precursor powder, and carrying out furnace cooling to obtain the low-infrared-emissivity composite pigment. The pigment is a flake aluminum powder pigment coated with bismuth oxide on the surface. The low-infrared-emissivity composite pigment prepared by the method has yellow appearance and low metallic gloss, and the average infrared emissivity is 0.43 under the optimal formula and technological conditions, thereby satisfying the technical requirements of the colored energy-saving coating and disguise application. The color is yellow, the b* value is up to 33.8, and the brightness is 65.8; and thus, the low-infrared-emissivity composite pigment can be used for optical characteristic regulation on the low-emissivity coating. The low-infrared-emissivity composite pigment is subjected to calcining treatment, and thus, has favorable heat stability. The low-infrared-emissivity composite pigment is nontoxic, has small hazards to the human body in the preparation process, and does not generate environment pollution.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to energy-saving and environment-friendly coating material technology, in particular to a composite pigment with low infrared emissivity composed of flake aluminum powder and a bismuth oxide layer coated on its outside and a preparation method thereof. Background technique [0002] Low infrared emissivity coatings have low heat radiation and heat shielding functions, and have broad application prospects in many national economic fields such as thermal control, energy saving, stealth and camouflage. Low infrared radiation emissivity coatings are usually composed of infrared reflective pigments, coloring pigments and binders, wherein infrared reflective pigments are the main functional medium, carrying the high infrared reflection (low infrared radiation) function of the coating; metallic pigments are currently the most widely used Mature and common infrared reflective pigm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/64C09C3/06
CPCY02P20/10
Inventor 徐聪翁小龙刘勇黄刚
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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