▎ 摘　　要

NOVELTY - A superhydrophobic heat-resistant coating comprises superhydrophobic material (A) comprising 45-50 parts mass graphene, 2.5-6 parts mass ethyl silicate, 5-12 parts mass silane coupling agent, 55-75 parts mass absolute ethanol, 0.8-2 parts mass aqueous ammonia and 8-15 parts mass deionized water, and coating component (B) comprising 20-30 parts mass lignin, 20-30 parts mass starch, 16-18 parts mass diatomaceous earth mud, 10-12 parts mass calcium ash, 10-15 parts mass heavy calcium, 0.5-1 part mass defoamer, 0.8-1 part mass dispersant and 15-30 parts mass deionized water. USE - Superhydrophobic heat-resistant coating (claimed). ADVANTAGE - The superhydrophobic heat-resistant coating has excellent comprehensive air permeability due to the presence of starch, lignin and diatomaceous earth, waterproof performance and thermal conductivity, and high specific surface area. DETAILED DESCRIPTION - A superhydrophobic heat-resistant coating comprises superhydrophobic material (A) comprising 45-50 parts mass graphene, 2.5-6 parts mass ethyl silicate, 5-12 parts mass silane coupling agent, 55-75 parts mass absolute ethanol, 0.8-2 parts mass aqueous ammonia and 8-15 parts mass deionized water, and coating component (B) comprising 20-30 parts mass lignin, 20-30 parts mass starch, 16-18 parts mass diatomaceous earth mud, 10-12 parts mass calcium ash, 10-15 parts mass heavy calcium, 0.5-1 part mass defoamer, 0.8-1 part mass dispersant and 15-30 parts mass deionized water. Also claimed is preparation of superhydrophobic heat-resistant coating, which involves preparing component (A) by ultrasonically-cleaning graphene with deionized water for 25-40 minutes, drying at 45-80 degrees C for 4.5-6 hours, obtaining a homogeneous solution (a1) by mixing aqueous ammonia, deionized water and 3/4 portion of absolute ethanol and stirring, mixing ethyl silicate and remaining anhydrous ethanol, stirring, obtaining a homogeneous solution (a2), adding liquid (a2) to liquid (a1), adding silane coupling with stirring to obtain a treatment liquid, adding graphene to the treatment solution at 20-35 degrees C for 4.5-6 hours, taking out the graphene, washing with absolute ethanol to a pH of 6.8-7.2, drying, preparing component (B) by adding lignin to starch polished to a particle size of 800-900 mesh, stirring, adding heavy calcium, calcium ash, dispersant and deionized water to diatomaceous earth, adding the mixture of starch and lignin and defoamer to resultant product and mechanically stirring, leaving still the component (B) for 10-15 minutes, mechanically-stirring for 0.5-1.5 minutes, adding component (A), stirring, obtaining a preliminary mixture, placing in an ultrasonic disperser, dispersing under ultrasonic power of 300 W at 18-25 degrees C for 8-12 minutes, taking out the mixture and leaving still at room temperature for 35-45 minutes.