▎ 摘　　要

NOVELTY - Preparing a flame-retardant photothermal conversion polymer foam involves soaking and cleaning polymer foam with water to remove impurities attached to the surface, and drying the cleaned polymer foam. The one or more of in-situ co-precipitation method, in-situ polymerization method and dip coating method are adopted to combine flame-retardant photothermal conversion coating on dried polymer foam to obtain polymer foam with flame-retardant light-to-heat conversion performance. The obtained foam is hydrophobized by steam reduction method or dip coating method to obtain final product. USE - Method for preparing a flame-retardant photothermal conversion polymer foam. ADVANTAGE - The method enables to prepare a flame-retardant photothermal conversion polymer foam, which converts solar energy into heat energy, reduces viscosity by heating oils with higher viscosity to achieve purpose of adsorbing high-viscosity oil, and solves problem that high-viscosity oils are difficult to process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for using a flame-retardant photothermal conversion polymer foam, which involves: (A) putting foam into low-viscosity oil products to realize efficient recycling of low-viscosity oil products, where low-viscosity oil product is one or more of toluene, n-hexane, gasoline, and chloroform; and (B) putting flame-retardant light-heat conversion polymer foam into high-viscosity oil product, and using sunlight to achieve efficient recycling of high-viscosity oil product, where high-viscosity oil product is one or more of heavy oil, crude oil, and asphalt, and oil absorption of flame-retardant light-heat conversion polymer foam is 10-3000g.g1, and oil absorption flux is 100-10000g.m-2 per minute.