▎ 摘　　要

NOVELTY - Janus structure program temperature control elastic material comprises Janus double-layer structure. The Janus double-layer structure includes a first structural layer and a second structural layer stacked on top of each other. The first structural layer has an adjustable solar light transmittance, and the visible light transmittance is 3-95%. The second structural layer has the function of high-efficiency light-to-heat absorption and conversion, and the light-to-heat conversion efficiency is 20-98%. USE - The elastic material is used in field of solar passive heating, passive cooling or infrared anti-counterfeiting (claimed). ADVANTAGE - The method uses the black photothermal absorption conversion elastomer as base to absorb the energy of sunlight to convert it into heat, the energy of the transmitted visible light is controlled by adjusting the visible light transmittance of the elastic body with different visible light transmittances, can precisely control the light-to-heat conversion efficiency to achieve temperature regulation, and has great application potential in multiple fields e.g. passive heating by sunlight, passive cooling and infrared anti-counterfeiting. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing the elastic material, comprising (1) providing elastomer precursors with different transmittances comprising nanoparticles, first polymer hydrogel precursor solution and crosslinking agent, (2) crosslinking the mixed system comprising the photothermal absorption conversion component, the second polymer hydrogel precursor solution and the crosslinking agent to generate a photothermal absorption conversion elastomer, and (3) applying the elastomer precursors with different transmittances to the light-to-heat absorption conversion elastomer, through chemical or physical crosslinking to prepare Janus structure program temperature control elastic material; and Janus structure program temperature control elastic material prepared by the above preparation method.