Preparation method of phase-change solar heat-absorption coating with high heat absorption rate

Abstract

The invention discloses a preparation method of phase-change solar heat-absorption coating with a high heat absorption rate and belongs to the technical field of preparation of coating. According to the preparation method, after an emulsifier OP-10, liquid paraffin and hydrochloric acid are acidified and dissolved, a mixture is homogenized and emulsified under a heating state to obtain oil-in-water emulsion; outer holes of organic dispersion carbon nanotubes are blocked through black absorbents including a manganese ferrite black spinel pigment, carbon black, copper oxide powder and the like;on one hand, added titanium white has a light extinction effect; on the other hand, titanium dioxide is used as a photo-thermal absorption catalyst and can be compounded with silicon dioxide in thermal phase-change microcapsules, so that adjustable phase change temperature, shaping and phase change energy storage, and high energy storage density of a material are realized; polyethylene glycol 10000 with high latent heat and the liquid paraffin which easily has phase change at room temperature are utilized, so that the energy storage efficiency of the phase change material is improved; the surface of a carbon nanotube material is modified by utilizing p-nitroaniline diazonium salt; the distribution of a phase change substance in the phase change material is more uniform through high heat conductivity and high specific surface area of the carbon nanotube material, and convection and heat dissipation of the coating are reduced, so that the preparation method has a wide application prospect.

Description

technical field [0001] The invention discloses a preparation method of a high heat absorption rate internal phase change solar heat absorbing paint, which belongs to the technical field of paint preparation. Background technique [0002] Solar heat-absorbing coatings have a good effect on improving solar energy absorption. By coating heat-absorbing coatings on low-emissivity materials such as aluminum, copper, and stainless steel, solar heat-absorbing coatings are used in solar collectors, solar collector panels, etc., using Atomizing injector can spray 4 square coating films per kilogram of paint. Solar heat-absorbing paint has good temperature resistance. The paint is directly painted on the surface of the heat-absorbing body to help the substrate absorb the heat of the sun. Anti-corrosion, waterproof, acid and alkali resistance, and convenient construction. [0003] With the change of energy form, the reserves of conventional energy are decreasing day by day. It is the p...

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is aimed at the defects that the current solar heat-absorbing coatings have low light absorption capacity for long-wave bands, resulting in low heat absorption efficiency, and after heat absorption, the coatings are easy to dissipate heat through thermal radiation and convection, which reduces the energy storage efficiency. , providing a method for preparing internal phase-change solar heat absorbing coatings with high heat absorptivity