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Preparation method of heteromultimeric solar modified silica sol selective heat absorbing coating

A technology of heat-absorbing coatings and silica sol, which is applied in the direction of radiation-absorbing coatings, coatings, metal-free paints, etc., can solve the problems of poor weather resistance, large environmental pollution, and high cost, and achieve good heat absorption effect, Small convection and radiation heat loss, good weather resistance and water resistance

Inactive Publication Date: 2013-10-23
余历军 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently used solar selective coating materials are generally black nickel, black chromium, aluminum anodized coatings, etc. The preparation of such coatings causes great environmental pollution, high cost, and poor weather resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The preparation method of a heteromeric solar energy modified silica sol selective heat-absorbing coating described in this example, take 100ml of water glass with a modulus of 2.2, add 100ml of water and stir at 100°C, add the concentration in 3 times 200g of 20% active silicic acid, heat and stir for 1.5h to obtain 300ml of silica sol, add 40ml of modifier emulsion, stir and mix to obtain a film-forming base material. Use 60% film-forming base material and 40% iron powder with a particle size of 1 μm to grind into a uniform dispersion system to obtain a solar heat-absorbing coating. The coating is coated on a quartz plate and cured in 1 hour.

[0014] The prepared quartz film sees through under the ultraviolet light and visible light of 300nm, 320nm, 500nm and 1000nm, and the transmittance is 0; under the infrared light of 1000-2600nm, the transmittance is 5-40%, and the film is selective. absorb.

Embodiment 2

[0016] The preparation method of a heteromeric solar energy modified silica sol selective heat-absorbing coating described in this example, take 80ml of water glass with a modulus of 2.2, add 100ml of water and stir at 80°C, add the concentration in 5 times Prepare 180g of 20% active silicic acid, heat and stir for 1 hour to prepare silica sol, add 60ml modifier emulsion, stir and mix to obtain film-forming base material. Use 70% film-forming base material and 30% iron powder with a particle size of 1 μm to grind into a uniform dispersion system to obtain a solar heat-absorbing coating. The coating is coated on an aluminum plate and cured in 1 hour.

[0017] The diffuse reflection test of the prepared aluminum plate film shows that the reflectance in the visible light region is very low, about 0.06, and gradually increases in the near infrared region. According to the transmittance of the aluminum plate film is 0, the absorptivity in the visible light region can be regarded as ...

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Abstract

The invention discloses a preparation method of a heteromultimeric solar modified silica sol selective heat absorbing coating and aims to solve the technical problems of serious preparation environment pollution, higher cost and poor weather resistance of the current solar selective heat absorbing coating. The preparation method is characterized by comprising the following steps of: weighting 80-100ml of water glass, adding 80-100ml of water, stirring the mixture at the temperature of 80-100 DEG C, adding 180-200g of 20% active silicic acid in 3-6 times, preserving the heat and stirring for 1-1.5 hours to prepare silica sol, then, adding 40-60ml of modifying agent emulsion, stirring and mixing all the components to obtain a film forming base material; and grinding 60-70% of the film forming base material and 30-40% of iron powder to form a uniform dispersion system, namely the heat absorbing coating. The preparation method is safe, reliable, environment friendly and efficient in the preparation process; the prepared coating has a certain spectral selectivity, is good in heat absorbing effect and small in convection current and radiating heat loss when being applied to a heat collector and is better in weather resistance and water resistance.

Description

technical field [0001] The invention relates to the technical field of heat-absorbing coatings, in particular to a method for preparing a selective heat-absorbing coating of heteropolymeric solar energy modified silica sol. Background technique [0002] At present, coatings that selectively absorb solar energy are widely used. For example, the heat collector of a solar heat collection system can convert solar radiation energy into heat of the working medium. In order to improve the efficiency of solar thermal collectors, the most effective way is to minimize its convective and radiative heat loss while maintaining maximum solar energy collection. The use of high-quality selective absorption coating materials and high-transmittance cover materials is an important way to meet the above requirements. Currently used solar selective coating materials are generally black nickel, black chromium, aluminum anodized coatings, etc. The preparation of such coatings causes great environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/38C09D5/32
Inventor 余历军唐玉敏
Owner 余历军
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