▎ 摘　　要

NOVELTY - Improving visible near infrared band solar absorption ratio comprises adding gas phase silica and low-dimensional carbon nanomaterial into the film-forming raw materials when preparing the spray coating solution for the absorption layer, spraying liquid forming the absorption layer, and using a sol-gel method to deposit a porous titanium dioxide and/or silica composite film with nano-scale protrusions on the surface of the absorption layer. USE - The method is useful for improving visible near infrared band solar absorption ratio. ADVANTAGE - The method utilizes synergistic mechanism of the anti-reflection layer and the absorption layer, and improves the solar absorption ratio of the absorbing coating. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing material with high visible near infrared band solar absorption ratio, comprising (i) stirring and mixing the low-dimensional carbon nano-absorbent material, fumed silica and silicone resin binder, adding the catalyst tetrabutyl titanate to the above system and continuously stirring to obtain a spraying liquid; (ii) applying the spraying liquid prepared in step (i) to form an absorption coating on the substrate; (iii) preparing silica sol solution; (iv) soaking absorbing coating prepared in step (ii) in the silica sol solution in step (iii), and preparing a thin film of silica microspheres on the surface of the absorbing coating; (v) preparing titanium dioxide precursor solution; (vi) processing the coating into the titanium dioxide precursor solution prepared in step (v), removing the pore-forming agent to obtain coating material with high visible near infrared band solar absorption ratio.