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Hydrosol for preparing solar photo-thermal conversion absorption film

A technology for absorbing thin films and hydrosols, applied in solid-state chemical plating, metal material coating technology, coatings, etc., can solve problems such as the difficulty of sols, and achieve simple and easy preparation methods, simple preparation processes, and low equipment requirements Effect

Inactive Publication Date: 2012-02-22
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with organic alcohol solvents, it is more difficult to form a sol with aqueous solutions, and no relevant reports have been seen so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] best practice

[0020] 1. Add 21.0g of citric acid and 29.1g of nickel nitrate hexahydrate into 50mL of water in turn under stirring, and continue stirring until a clear Ni sol is obtained.

[0021] 2. Add 21.0g of citric acid and 37.5g of aluminum nitrate nonahydrate into 50mL of water in turn under stirring, and continue stirring until a clear Al 2 o 3 Sol.

[0022] 3. Combine Ni sol and Al 2 o 3 The sol was mixed according to Ni:Al molar ratio = 80:20 and 1 wt% fatty alcohol polyoxyethylene ether AEO-9 was added. After stirring evenly, a Ni-Al with a nickel content of 80% and suitable wetting properties was obtained. 2 o 3 Mixed sol.

[0023] Ni-Al 2 o 3 The mixed sol is formed into a film on an aluminum substrate, and after heat treatment, Ni-Al with a nickel molar content of 80% is obtained 2 o 3 film. The surface of the film is uniform in color and has no microcracks. Its absorption rate of solar energy can reach 0.86, and its emissivity is only 0.03....

Embodiment 2

[0025] 1. Add 21.0g of citric acid and 29.1g of nickel nitrate hexahydrate into 50mL of water, heat up to 90°C under stirring and reflux, and then add 24.8g of ethylene glycol until a clear Ni sol is obtained.

[0026] 2. Add 21.0g of citric acid and 37.5g of aluminum nitrate hexahydrate into 50mL of water, heat up to 90°C under stirring and reflux, and then add 24.8g of ethylene glycol until a clear Al 2 o 3 Sol.

[0027] 3. Combine Ni sol and Al 2 o 3 The sol was mixed according to the molar ratio of Ni:Al=90:10 and 0.5 wt% of phenolic polyoxyethylene ether TX-100 was added. After stirring evenly, a Ni-Al with a nickel content of 90% and suitable wetting properties was obtained. 2 o 3 Sol.

[0028] Ni-Al 2 o 3 The mixed sol forms a film on an aluminum substrate, and after heat treatment, Ni-Al with a nickel molar content of 90% is obtained 2 o 3 film. The surface of the film is uniform in color and has no microcracks. Its absorption rate of solar energy can reach 0...

Embodiment 3

[0030] 1. Add 21.9g of ethylenediaminetetraacetic acid and 14.6g of nickel nitrate hexahydrate into 50mL of water in sequence under stirring, then add ammonia water to it until the pH of the solution is approximately equal to 10, to obtain a clear Ni sol.

[0031] 2. Add 21.9g of ethylenediaminetetraacetic acid and 18.8g of aluminum nitrate hexahydrate into 50mL of water in turn under stirring, then add ammonia water to it until the pH of the solution is approximately equal to 10 to obtain a clear Al 2 o 3 Sol.

[0032] 3. Combine Ni sol and Al 2 o 3The sol was mixed according to the molar ratio of Ni:Al=70:30, and 0.1 wt% of silicone surfactant polyether modified heptamethyltrisiloxane was added. After stirring evenly, a nickel molar content of 70% and a suitable wet Wet Properties Ni-Al 2 o 3 Sol.

[0033] Ni-Al 2 o 3 The mixed sol is formed into a film on an aluminum substrate, and after heat treatment, Ni-Al with a nickel content of 70% is obtained 2 o 3 film. T...

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Abstract

The invention provides a hydrosol for preparing a solar photo-thermal conversion absorption film. Water is used as a solvent in the hydrosol; a transition metallic M salt, an aluminum salt and a chelating agent are used as raw materials; the transition metallic M salt and the aluminum salt are respectively prepared into an M sol and an Al2O3 sol together with the chelating agent; and the M sol and the Al2O3 sol are mixed and added with a wetting agent to form an M-Al2O3 mixed sol, namely the hydrosol. The M-Al2O3 mixed sol for preparing the absorption film is prepared by using the environment-friendly water as the solvent; the sol preparation method is simple, feasible, easily obtainable in raw materials and low in cost; after the M-Al2O3 mixed sol added with the wetting agent forms a film on a metal substrate, an M-Al2O3 absorption layer can be directly obtained by thermal treatment under inert atmosphere; the film preparation process is simple, convenient and low in equipment requirement, and has no pollution to the environment; and the solar absorption rate of the prepared single-layer M-Al2O3 film can reach 0.86, and the emissivity of the film is only 0.03.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a hydrosol used for preparing solar light-to-heat conversion absorbing films. Background technique [0002] The solar thermal conversion absorbing film is the most important and core part of the solar collector, and plays a key role in the field of solar thermal utilization. Its manufacturing cost and performance directly affect the promotion of solar thermal utilization. M-Al 2 o 3 Composite thin film is a cermet thin film with excellent optical properties and stability, which is widely used as the surface of solar collectors. At present, common thin film preparation methods include physical vapor deposition such as vacuum evaporation, sputtering film formation and ion plating, and electrochemical deposition such as electroplating and anodic oxidation. However, the electrochemical method uses a large amount of harmful substances such as phosphate and cyanide, caus...

Claims

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Application Information

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IPC IPC(8): B22F9/16C23C20/08
Inventor 赵剑曦李镇祥
Owner FUZHOU UNIV
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