Solar selective absorbing coating and preparation method thereof

Abstract

The invention provides a solar selective absorbing coating and a preparation method thereof. The solar selective absorbing coating is prepared from the following raw materials: a light absorbing agent, a heat conducting aid, diisocyanate, polyether polyol, a chain extender, a dispersing agent, a solvent, other aids and the like. According to the solar selective absorbing coating provided by the invention, the adopted light absorbing agent is spinel type ternary transition metal oxide, the solar selective efficiency is high, the photo-thermal conversion efficiency is high, the polymer is a single-component polyurethane system, the solvent is environment-friendly, and the product is good in mechanical strength and excellent in toughness; and especially, the coating has excellent aging resistance, high and low temperature resistance, water resistance, freezing resistance and the like, is a single component, does not need to be blended on site, and is convenient for construction.

Description

technical field [0001] The invention relates to the field of solar photothermal technology, in particular to a solar selective absorption coating and a preparation method thereof. Background technique [0002] The deterioration of the human living environment and the increasing shortage of energy are two major problems facing the world today. The use of new renewable energy is the fundamental way to solve this problem. Among them, solar energy is clean, inexhaustible and inexhaustible. Advantages become the first choice for new energy. How to efficiently and rationally utilize solar energy is the focus of domestic and foreign scholars' research in recent years. [0003] The coating method is a relatively convenient method for preparing solar selective absorption coatings. Usually, the fuel and the adhesive are mixed to form a coating, and then the coating is applied to the substrate by spraying, dipping, rolling, etc., and finally dried. Or drying, due to the convenience o...

AI Technical Summary

Problems solved by technology

The technology center for the preparation of solar selective absorbing coatings by the existing coating method mainly uses epoxy resin or acrylic resin as the adhesive. Among them, epoxy resin is usually two-component, and the construction is relatively complicated, and its texture is hard and brittle. Poor aging resistance, easy cracking and powdering when used outdoors for a long time have always been the shortcomings of epoxy resin that are difficult to overcome; while acrylic resins have good aging resistance, but their mechanical properties are insufficient, and their application fields are limited.

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