Solar selective heat-absorbing coating

Abstract

The invention discloses a solar selective heat-absorbing coating. A light absorbing agent, a film forming agent, a solvent and an aid are evenly dispersed with a ball-milling method, a coalescing agent is added, and the solar selective heat-absorbing coating can be obtained after mixing. The coating is prepared from raw materials in parts by weight as follows: 50-100 parts of the film forming agent, 10-30 parts of the coalescing agent, 35-55 parts of the light absorbing agent, 20-50 parts of the solvent and 10-30 parts of the aid; the coalescing agent is propylene glycol butyl ether, propylene glycol monomethyl ether acetate and the like; a preparation method of the film forming agent comprises steps as follows: casein and gelatin are mixed in the weight ratio being (5-10):(2-3), water is added, the mixture is soaked at 15-22 DEG C and then transferred to a normal-temperature environment, a mixture of methyl acrylate and hexamethyldisiloxane in the weight ratio being (1-2):)(1-3) is added, the mixture is stirred and then irradiated under ultraviolet light for 10-15 min, and then modified casein-gelatin is obtained. The film forming agent is modified to be used as an important raw material for preparing the coating, the prepared coating has good weather resistance and waterproofness outdoors, the preparation process is simple and easy to understand, and the heat absorption efficiency of the heat-absorbing coating is guaranteed.

Description

technical field [0001] The invention relates to heat-absorbing materials, in particular to a solar selective heat-absorbing paint. Background technique [0002] Energy utilization plays a pivotal role in the development of human society, but the excessive development of resources and inefficient resource utilization make human beings face a severe test. As we all know, solar energy is the most abundant and widely available renewable energy, which plays a major role in solving energy crisis and environmental problems. , making it a hot research topic in various countries. Our country is rich in solar energy resources and has broad prospects for solar energy utilization. At present, it is the first user and producer of solar water heaters in the world. [0003] Solar thermal application is one of the simplest, most direct, and most effective ways for human beings to utilize solar energy. However, due to the small and discontinuous energy density of solar energy after reachin...

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Problems solved by technology

[0005] The current solar heat-absorbing coatings are full of researches specifically aimed at the weather resistance and water resistance of solar energy coatings. Nowadays, nano-materials are used as raw materials for heat-absorbing materials, which can improve the weather resistance and heat-absorbing efficiency of coatings. For example, Chinese patent CN102286243A , but the cost is extremely high; there are also changes in the formulation of pigments to improve the weather resistance of the prepared coatings, such as Chinese patent CN102134428B, but its preparation process is complicated and requires high

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