The invention relates to a dissolvent-free
polyurethane weather-proof anticorrosive
coating for a
storage tank. The
coating is composed of a component A and a component B, wherein the component A comprises the following components by weight percentage: 20-60 percent of
hydroxide radical, 0.3-1.0 percent of dispersant, 0.5-2.0 percent of antifoamer, 0.2-0.6 percent of leveling agent, 2.0-5.0 percent of dehydrator, 0.5-1.0 percent of anti-
settling agent, 0.1-1.0 percent of curing accelerator, 1.0-3.0 percent of
ultraviolet absorbefacient, 0.5-2.0 percent of photostabilizer, 0.2-1.0 percent of
antioxidant, 5.0-20 percent of aluminum dihydrogen tripolyphosphate, 10-25 percent of
titanium dioxide, 10-20 percent of
barium sulfate and 4.0-6.0 percent of
zeolite power, wherein the component
hydroxide radical is
polyester polyether polylol obtained by chemically modifying
castor oil; the component B is a
hexamethylene diisocyanate curing agent; the weight ratio of the component A to the component B is 100:25-100:50. Via the selection of the terminal hydroxyl compound and the curing agent in the component A, bubbles in the anticorrosive
coating are reduced. The coating has good anticorrosive performance, and besides, the super-high performance of UV
aging resistance and salt and
fog resistance is suitable for the outer wall construction of the
storage tank.