Ultra-light hydrogel as well as preparation method and application thereof

Abstract

The invention discloses an ultra-light hydrogel as well as a preparation method and application thereof. The ultra-light hydrogel comprises a hydrogel matrix with a hydrogel network and foaming microspheres distributed in the hydrogel network, and the foaming microspheres are of closed pore structures. The preparation method comprises the following steps: carrying out a high-temperature polymerization reaction on a hydrogel monomer and a foaming microsphere, so that the foaming microsphere is foamed, and meanwhile, the crosslinking of the hydrogel monomer is realized, and the ultra-light hydrogel is prepared. The ultra-light hydrogel provided by the invention has the advantages of low density (0.010-0.385 g.cm <-3 >), 0-degree water contact angle, high elasticity (more than or equal to 80% of compressive strain), low thermal conductivity (less than or equal to 0.034 W.m <-1 >. K <-1 >) and water content of more than or equal to 50 wt%, also shows excellent heat insulation performance, excellent solar reflectivity and infrared emissivity, and can effectively reflect sunlight and dissipate heat in sunlight, so that radiation cooling is realized, and the ultra-light hydrogel has a good application prospect. The cooling range reaches 5-10 DEG C;

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