Nano cermet solar heat-absorption coating material and preparation method thereof

Abstract

The invention relates to a nano cermet solar heat-absorption coating material and a preparation method thereof. The coating material is prepared from the following components in parts by weight: 40-50 parts of organic silicon resin, 2-7 parts of curing agent, 11-12 parts of absorbent, 2-4 parts of absorbing enhancer, 33-45 parts of aid, 13-17 parts of cermet material and 7-13 parts of heat-conducting material. The absorbent is doping-modified nano titanium dioxide. The preparation method sequentially comprises the following steps: constant-temperature pressurization reaction, reflux reaction and reduced pressure distillation reaction. Compared with the prior art, the doping-modified nano titanium dioxide is used as the absorbent and matched with the absorbing enhancer, so that the coating material has excellent solar absorptivity. The cermet material and heat-conducting material with photocatalytic mobility are adopted to widen the solar absorption range and enhance the heat-conducting property of the coating material, so that the coating material has the advantages of longer service life, mild technological conditions for reaction and low production cost, and can easily implement industrial production.

Description

technical field [0001] The invention belongs to the technical field of solar heat utilization, and relates to a nanoscale cermet solar heat absorbing coating material and a preparation method thereof. Background technique [0002] Solar thermal utilization is an important form of solar energy utilization, which refers to the process of collecting solar radiation energy with solar collectors and converting it into thermal energy through the interaction with substances for utilization. As the problem of energy shortage becomes more and more serious, the country invests more and more in energy saving and emission reduction measures, which makes people's research on solar thermal utilization more and more extensive and in-depth, and solar thermal utilization will have a broader development prospect. [0003] Solar heat absorbing coating is the core functional part of the solar light absorbing system for absorbing light energy, and is usually used in solar heat collecting element...

AI Technical Summary

Problems solved by technology

At present, black organic coatings, such as black fluorocarbon resin, black epoxy resin, black polyurethane resin, etc., are sprayed on the heat-absorbing plate core of flat-plate collectors in the market. As a binder, ordinary carbon black or black pigment is used as a color body, so there are the following problems: 1. The coating is not weather-resistant, easy to premature chalking and fading; 2. There is no spectral selectivity, so that the coating emits High efficiency, resulting in low thermal efficiency of solar panel collectors

[0004] In addition, in the preparation of existing solar heat-absorbing coating materials, aluminum is mostly selected as the sputtering cathode, which reacts with nitrogen to form a film in the form of a gradient film. This film is only suitable for use in a low-temperature vacuum environment, and has poor baking resistance. The baking resistance of the film prepared by the interference film is better than that of the film prepared by the gradient film, but the optical constant and thickness of each layer are required to be precisely controlled during the preparation, so the preparation process is complicated and the raw material is expensive