Method for preparing solar selective heat absorbing paint by using spinel type pigment as light absorbent

A spinel-type, endothermic coating technology, applied in 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 photothermal conversion efficiency, good mechanical properties, simple and controllable process

Active Publication Date: 2012-10-03
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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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 paint by using spinel type pigment as light absorbent
  • Method for preparing solar selective heat absorbing paint by using spinel type pigment as light absorbent
  • Method for preparing solar selective heat absorbing paint by using spinel type pigment as light absorbent

Examples

Experimental program
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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, stir well and add 0.008mol polyethylene glycol Alcohol 200, and use ammonia water to adjust the pH value of the solution to neutral; heat the above solution at 80°C, and after forming a sol, heat it in an oven at 130°C until a xerogel is formed; Ignite it in a medium and burn it violently to get a light black powder; place the powder in a muffle furnace at 500°C for 2 hours to get black nanoscale spinel CoCuMnO x Powder, the powder particle size is 23nm.

[0044] (2) Preparation of paint:

[0045] Recipe: 10 parts of CoCuMnO x Powder, 45 parts of epoxy-modified polyurethane resin, 5 parts of additives (mixed by 1 part of leveling agent, 1 part of wetting agent, and 3 parts of defoamer) and 30 parts of anhydrous xylene are mixed, and the The method is to disperse evenly, and then add 10 parts...

Embodiment 2

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

[0050] (2) Preparation of paint: 9 parts of CuCr 0.5 mn 1.5 o 4 Powder, 40 parts of acrylic modified polyurethane resin, 6 parts of additives (mixed from 2 parts of leveling agent, 1 part of wetting agent, and 3 parts of defoamer) and 35 par...

Embodiment 3

[0054] (1) Preparation of nanoscale spinel pigments: Dissolve 0.1mol copper nitrate, 0.2mol chromium nitrate and 0.3mol citric acid in 120ml deionized water, stir and dissolve in the medium, then add 0.04mol dispersant polyethylene glycol 200 , and adjust the pH value of the solution to neutral with ammonia water; heat the above solution at 85°C, and heat it in an oven at 120°C to form a xerogel after forming a sol; use a few drops of ethanol as an ignition agent for the xerogel in the air Light black powder was obtained by medium ignition to make it fully burnt; the powder was calcined in a muffle furnace at 700°C for 2 hours to obtain black nano-scale spinel CuCr 2 o 4 Powder, the powder particle size is 29nm.

[0055] (2) Preparation of paint: 7 parts of CuCr 2 o 4 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, and 3 parts of defoamer) and a mixture of 29 parts of anhydrous ...

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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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Patent Type & Authority Patents(China)
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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