▎ 摘　　要

NOVELTY - Polyurethane having far infrared spectrum efficacy comprises 30-70 pts. wt. aqueous polyurethane, 20-60 pts. wt. spectrum powder, 2-5 pts. wt. crosslinking agent, 1-3 pts. wt. leveling agent, 1-3 pts. wt. dispersant and 0.2-1 pts. wt. anti-settling agent. The spectrum powder comprises at least one of ceramic powder, carbon powder, silicate mineral powder. The ceramic powder comprises chromium oxide green, aluminum oxide, titanium oxide and zirconium oxide. USE - The polyurethane having far infrared spectrum efficacy is useful in preparing leather (claimed). ADVANTAGE - The polyurethane has excellent far infrared performance, excellent mechanical property and surface gloss. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing polyurethane having far infrared spectrum efficacy comprising (i) heating aqueous polyurethane to 45-55 degrees C, maintaining temperature unchanged, adding spectrum powder, crosslinking agent, leveling agent, dispersing agent and anti-settling agent, adding material while stirring, stirring for 3-5 hours to obtain substance A, and (ii) grinding the substance A till the grain diameter is not greater than 2 mu m to obtain polyurethane having far infrared spectrum efficacy; and (2) use of polyurethane having far infrared spectrum efficacy in preparing leather comprising (i) taking release paper as bottom layer, coating layer of polyurethane having far infrared spectrum efficacy, controlling the thickness of polyurethane coating after coating is 170-190 m, baking at 140-160 degrees C, forming film 70-90 mu m, entering the next process, (ii) coating layer of polyurethane with far infrared spectrum effect on basis of step (i), controlling thickness of polyurethane coating after coating is 240-260 m, baking at 160-180 degrees C, forming film 100-120 m, entering the next process, (iii) coating a layer of polyurethane with far infrared spectrum effect on the basis of the step (ii), controlling the thickness of polyurethane coating after coating is 340-360 mu m, the baking temperature is 140-160 degrees C, forming film 150-170 mu m and entering the next process, and (iv) covering a layer of polyurethane base cloth on the basis of the step (iii), baking at 180-200 degrees C and finally separating the release paper to obtain leather.