Low-temperature curing powder coating

The invention discloses a low-temperature curing powder coating, which is prepared from the following raw materials in parts by weight: 70-80 parts of 193 unsaturated polyester resin, 3-5 parts of bisphenol A-diglycidyl ether, 2-3 parts of closed sulfonic acid catalyst (AC32-18A), 10-12 parts of blocked isocyanates TS280, 4-6 parts of aluminium nitride, 2-3 parts of n-dodecanol ester, 2.8-3.2 parts of nanometer titanium dioxide, 4-6 parts of superfine barium sulfate, 1-2 parts of molybdenum oxide, 1-3 parts of titanium oxide, 0.8-3 parts of titanium yellow, 0.5-1 part of cobalt blue, and 12-20 parts of composite filler. The powder coating disclosed by the invention is low in curing temperature and wide in application, and can be applied to the fields such as timbers, engineering plastics, metal alloy materials and the like; the production cost is saved.