Nanometer substrate solar heat-absorbing coating and preparation method thereof

Abstract

The invention discloses a nanometer substrate solar heat-absorbing coating which is characterized by comprising the following raw materials in parts by weight: 25-35 parts of acrylate modified composite emulsion, 2-8 parts of nanometer powder pigment, 7-12 parts of polyvinyl alcohol, 3-15 parts of phenoxyethanol, 2-6 parts of nickel salt, 4-10 parts of glycol phenylate, 2-6 parts of n-butyl acetate, 4-8 parts of superfine graphite powder, 5-10 parts of a coalescing agent, 3-7 parts of triethanolamine, 0.2-0.4 part of a dispersing agent, 0.5-0.7 part of a thickening agent and 0.3-3.5 parts of nanometer silicon dioxide. The nanometer substrate solar heat-absorbing coating provided by the invention takes the nanometer powder pigment as a raw material, so that the coating material has high heat efficiency and excellent properties of high spectral selectivity and visible light absorptivity and low emissivity.

Description

technical field [0001] The invention belongs to the field of heat-absorbing coatings, in particular to a nano-matrix solar heat-absorbing coating and a preparation method thereof. Background technique [0002] At present, it is generally used in the market to spray black organic coatings on the heat-absorbing plate core of the flat collector, such as black fluorocarbon resin, black epoxy resin, black polyurethane resin, etc., because ordinary resin materials are used as adhesives. 2. Since ordinary carbon black or black pigments are used as the color body, there will be no spectrum Selectivity, so its coating emissivity is very high, which results in low thermal efficiency of solar panel collectors. [0003] The selective absorbing layer is the core functional part of the light absorbing system for absorbing light energy, and is usually used in solar heat collecting elements or solar selective absorbing coating systems. The structure of the solar selective absorption coati...

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Problems solved by technology

[0004] The key to preparing an excellent selective absorbing coating lies in the selection of materials and preparation processes with better solar spectrum selectivity. The current coatings mostly choose aluminum as the sputtering cathode, which reacts with nitrogen to form a film in the form of a gradient film. This kind of film is suitable for low-temperature vacuum use, and its baking resistance is poor; the baking resistance of the film prepared by interference film is better than that of gradient film, but the optical constants and thickness of each layer must be precisely controlled during preparation. The process is complex and the materials involved are relatively expensive