Low-temperature curing polyester type powder coating and preparation method thereof

The invention discloses a low-temperature curing polyester type powder coating and a preparation method thereof, and belongs to the technical field of coating compositions. The unsaturated polyester resin-modified epoxy resin composite material is prepared from the following raw materials in parts by weight: 36 to 45 parts of unsaturated polyester resin, 6.2 to 9.5 parts of modified epoxy compound, 17.5 to 25 parts of filler, 6.8 to 8.9 parts of pigment, 0.75 to 1 part of epoxy curing agent T31, 2 to 4.2 parts of unsaturated polyester resin curing agent and 0.1 to 0.4 part of dispersing agent. The coating of the low-temperature curing polyester type powder coating is good in flexibility and hydrophobicity, and hydrolysis and aging caused by the fact that water enters the coating can be prevented; the powder coating shows excellent flowability in the curing and melting stage, the leveling property of the product is improved, and the effect that the surface of the coating is glossy and free of pores can be achi