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Method for preparing solar selective heat-absorbing coating with spinel pigment as light-absorbing agent

A spinel-type, heat-absorbing coating technology, which is applied in the direction of radiation-absorbing coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of not examining the influence of powder structure and performance, affecting product structure and optical properties, etc. Achieve the effect of improving light-to-heat conversion efficiency, good mechanical properties, and simple and controllable process

Active Publication Date: 2011-12-21
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The four composite oxides involved in this paper were all synthesized in one step by sol-gel self-propagating combustion method, and the effect of calcination at different temperatures on the structure and properties of the powder was not investigated.
However, we found during the experiment that not all spinel-type transition metal oxides can be directly obtained by the sol-gel self-propagating combustion method. Calcining the burned powder at a certain temperature is very important for the synthesis of some spinel. It is necessary for transition metal oxides, and the difference in calcination temperature will directly affect the structure and optical properties of the product

Method used

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  • Method for preparing solar selective heat-absorbing coating with spinel pigment as light-absorbing agent
  • Method for preparing solar selective heat-absorbing coating with spinel pigment as light-absorbing agent
  • Method for preparing solar selective heat-absorbing coating with spinel pigment as light-absorbing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of nano-scale spinel pigments: Dissolve 0.01mol cobalt nitrate, 0.03mol manganese nitrate, 0.03mol copper nitrate and 0.05mol citric acid in 60ml deionized water, fully stir to dissolve and add 0.008mol polyethylene Alcohol 200, and adjust the pH of the solution to neutral with ammonia; heat the above solution at 80°C, and after the sol is formed, heat it in an oven at 130°C to form a dry gel; use ethanol as an ignition agent in the air It is ignited in a medium temperature and burned violently to obtain a light black powder; the powder is calcined in a muffle furnace at 500℃ for 2h to obtain a black nano-level spinel CoCuMnO x Powder, powder particle size is 23nm.

[0044] (2) Preparation of paint:

[0045] Formula: Combine 10 parts of CoCuMnO x Powder, 45 parts of epoxy modified polyurethane resin, 5 parts of additives (mixed with 1 part of leveling agent, 1 part of wetting agent, and 3 parts of defoamer) and 30 parts of anhydrous xylene. Method to dispers...

Embodiment 2

[0049] (1) Preparation of nano-scale spinel pigments: Dissolve 0.05mol chromium nitrate, 0.15mol manganese nitrate, 0.1mol copper nitrate and 0.25mol citric acid in 150ml ionized water, mix well and add 0.05mol dispersant after dissolving Polyethylene glycol 200, and adjust the pH of the solution to neutral with ammonia; heat the above solution at 70°C, and heat it in an oven at 150°C to form a dry gel after forming a sol; use a few drops of ethanol to make the dry gel The igniter is ignited in the air to make it fully burned to obtain a light black powder; the powder is calcined in a muffle furnace at 700°C for 1 hour to obtain a black nano-scale spinel CuCr 0.5 Mn 1.5 O 4 Powder, powder particle size is 35nm.

[0050] (2) Preparation of paint: add 9 parts of CuCr 0.5 Mn 1.5 O 4 Powder, 40 parts of acrylic modified polyurethane resin, 6 parts of additives (mixed by 2 parts of leveling agent, 1 part of wetting agent, and 3 parts of defoamer) and 35 parts of anhydrous xylene and a...

Embodiment 3

[0054] (1) Preparation of nano-scale spinel pigments: 0.1mol copper nitrate, 0.2mol chromium nitrate and 0.3mol citric acid are dissolved in 120ml ionized water, stirred and dissolved, and then 0.04mol dispersant polyethylene glycol 200 is added. , And adjust the pH value of the solution to neutral with ammonia; heat the above solution at 85°C, and heat it in an oven at 120°C to form a dry gel after the sol is formed; use a few drops of ethanol as an igniting agent in the air It is ignited in a medium temperature to fully burn to obtain a light black powder; the powder is calcined in a muffle furnace at 700°C for 2 hours to obtain a black nano-grade spinel CuCr 2 O 4 Powder, the particle size of the powder is 29nm.

[0055] (2) Preparation of paint: add 7 parts of CuCr 2 O 4 Mixture of powder, 45 parts of acrylic modified polyurethane resin, 8 parts of additives (a mixture of 2 parts of leveling agent, 3 parts of wetting agent, 3 parts of defoamer) and 29 parts of anhydrous xylene...

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Abstract

The invention relates to a method for preparing a solar selective heat absorbing paint by using a spinel type pigment as a light absorbent, which belongs to the field of solar heat utilization. The method comprises the steps of uniformly dispersing a nanoscale spinel type pigment as well as resin, a solvent and auxiliaries by using a ball milling method; and then adding a curing agent to obtain the solar selective heat absorbing paint. It is shown in the experiment that the paint is uniformly coated on a metal substrate by using a spraying method; and the solar selective heat absorbing paint obtained after being cured at room temperature shows higher solar energy absorption rate (0.93-0.95) and lower emissivity (0.18-0.30); and the photothermal conversion efficiency of a solar heat collector can be effectively improved; moreover, the coating has the advantages of good mechanical property, stronger weather resistance and service life of more than 45 years.

Description

technical field [0001] The invention relates to a solar selective heat-absorbing paint with a spinel pigment as a light-absorbing agent and a preparation method thereof, belonging to the field of solar heat utilization. Background technique [0002] The deterioration of the human living environment and the increasing shortage of energy are two major problems facing the world today. The use of new renewable energy is the fundamental way to solve the above problems. Among them, solar energy is clean, inexhaustible and inexhaustible. Become the first choice for new energy. The solar selective absorbing coating has a high absorption rate (α) for the radiation in the visible and near-infrared range of the sun, while its own infrared radiation rate is low, that is, it has a low emissivity (ε), which is the key to solar thermal utilization technology technology, which is crucial to improving collector efficiency. [0003] Selective endothermic coatings can be prepared by a variet...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/32C04B35/626
Inventor 刘刚耿庆芬赵鑫高祥虎杨生荣
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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