Self-cleaning reflective thermal insulation coating and preparation method thereof

The invention discloses a self-cleaning reflective thermal insulation coating and a preparation method thereof. The coating is prepared from the following raw materials in percentage by weight: 35 to60 percent of a silicone-acrylic copolymer emulsion, 10 to 30 percent of nanometer hollow glass beads, 2 to 5 percent of nano-titania, 1.4 to 5.0 percent of an assistant, 4 to 6 percent of a coalescing agent, 0.2 to 0.5 percent of a pH regulator and the balance of water. The self-cleaning reflective thermal insulation coating disclosed by the invention is modified by applying a nanomaterial, so that mechanical properties of the coating can be greatly improved, and other properties such as washability and acid and alkali resistance can be improved; the nano-titania is used as a self-cleaning assistant and undergoes light-catalyzed reaction under sunniness for decomposing pollutants on the wall surface; in addition, photoinduction generates a superhydrophilic effect, so that the pollutants on the surface of the oute