▎ 摘　　要

NOVELTY - Heat-conducting coating with synergistic effect of three kinds of fillers, formed by mixing dispersion liquid A and dispersion liquid B, adding curing agent while using and uniformly coating on metal heat conducting device. The dispersion liquid A is obtained by stirring and mixing 20-35 pts. wt. boron nitride, 2-3 pts. wt. modifier and 30-50 pts. wt. water, filtering and washing, redispersing the filter residue in first organic solvent, adding 50-150 pts. wt. epoxy resin, and stirring. The dispersion liquid B is obtained by mixing 5-9 pts. wt. graphene, 0.6-3 pts. wt. carbon tubes and 15-40 pts. wt. second organic solvent, and treat ultrasonically . The boron nitride is hexagonal boron nitride has long axis length of 150-450 nm, and elliptical disk shape. When the hexagonal boron nitride long axis length is 250-350 and 350-450 nm, the particle size of graphene is 2.7-3 and 3.0-3.5 microm, and carbon tubes length is 1-2.5, and 2.3-3.5 microm respectively. USE - The heat-conducting coating is useful for steam generator (claimed). ADVANTAGE - The heat-conducting coating: has heat conductivity greater than or equal to2.5 W.(m-1K-1); can withstand high temperature of 1000degrees Celsius and withstand water for up to 30 days; has excellent adhesion, and is resistant to acid and alkali; and can be applied to steam generators in nuclear power plants to meet the needs of rapid heat dissipation, high temperature resistance and water resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing heat-conducting coating with synergistic effect of three kinds of fillers, comprising (1) stirring and mixing boron nitride, modifier and water, filtering and washing, redispersing the filter residue in first organic solvent, adding epoxy resin, and stirring to obtain dispersion liquid A, (2) mixing graphene, carbon tube, and second organic solvent, and ultrasonically treating to obtain dispersion liquid B, (3) adding dispersion B into dispersion A under low-speed stirring to obtain thermally conductive coating.