Special absorbing coating for solar vacuum tube and preparation method thereof

Abstract

The invention discloses a special absorbing coating for a solar vacuum tube and a preparation method thereof. A composite absorption film in the absorbing coating is made of the following components by weight: 10-15 parts of aluminum nitride, 15-27 parts of graphene, 20-28 parts of acrylic resin, 2-8 parts of aluminum powder, 5-8 parts of cobalt powder, 12-18 parts of aluminum foam, 1-3 parts of amaleic acid grafting agent, 1-3 parts of plant extract and 20-28 parts of a hydrophilic polymer compound. The preparation method comprises the following steps: step 1, mixing all the above components, putting the obtained mixture into a ball mill for grinding, carrying out blending to obtain slurry and performing film drawing to form the composite absorption film; and step 2, sequentially covering the surface of the inner glass tube of the pretreated solar vacuum tube with a reflection film, the composite absorption film and an anti-reflection film in a film pulling manner and carrying out curing to obtain the absorbing coating. The special absorbing coating for the solar vacuum tube in the invention is prepared from a three-layer structure, and the composite absorption film has wide-spectrum infrared absorption and a high conversion rate at low temperature.

Description

technical field [0001] The invention relates to the technical field of solar vacuum tube preparation, in particular to a special absorption coating for solar vacuum tubes and a preparation method thereof. Background technique [0002] With the continuous popularization of green buildings and building energy conservation, the development and utilization of solar collectors have been paid more and more attention. The performance of the solar integrator is reflected in the vacuum tube. Existing solar vacuum tubes are made of two double-layer coaxial glass tubes. The outer surface of the inner glass tube is coated with an absorbing layer that absorbs solar radiation energy, thereby converting light energy into heat energy and obtaining new energy. [0003] Application number 201610736114.1 discloses a solar vacuum tube, which includes a cover glass tube and an inner glass tube, and the outer surface of the inner glass tube is coated with an absorbing layer; the absorbing layer ...

AI Technical Summary

Problems solved by technology

Although the present invention changes the absorbed absorbing paint so that the absorbing paint does not use an absorbent, it also has higher absorbency, and at the same time makes the absorbing paint have high strength, weather resistance, water resistance, and gloss and color retention, so that it can be The solar vacuum tube can absorb solar radiation energy to the greatest extent, and at the same time improve the service life of the solar vacuum tube, but the mechanical properties of the coating are poor, and the low-temperature absorption rate is low