The invention relates to preparation of paint, and aims at providing a preparation method for hydrophobic nanometer modified
resin composite paint used for an LED base plate. The method comprises: firstly uniformly dispersing nanometer alpha-Al2O3 and
butanol; then adding a
silane coupling agent KH560 and
ageing, so as to obtain a modified alpha-Al2O3
sol, and performing concentration
distillation; uniformly mixing 1H,1H,2H,2H-perfluorooctyltriethoxysilane, n-
butanol and
formic acid, then adding deionized water, and
ageing to obtain a
silicon fluoride oligomer sol; and dispersing the former two products, an
epoxy resin
monomer, 2-
butanone,
xylene and 2,2,4-trimethyl-1,3-pentanediolmono(2-methylpropanoate), so as to obtain the paint. By introducing alpha-Al2O3 nano-particle into a conventional
epoxy resin coating, the heat
conductivity of resin is improved, also the excellent
coating property and the workability of resin are maximumly kept, and the price is relatively appropriate. The hydrophobicity is substantially improved, and the
short circuit problem caused by air moist is reduced. The prepared hydrophobic nanometer modified
resin composite paint is suitable for production
processing on a conventional
production line, and is beneficial improvement on the basis of a conventional
epoxy-resin-coated
aluminium base plate.