Preparation method of modified melamine impregnated paper

The invention relates to the technical field of impregnated paper, and discloses a preparation method of modified melamine impregnated paper, which comprises the following steps: by taking heptyl-1, 6-diene-4-ol, 3, 5-diaminobenzoic acid, mercaptopropyl silane modified titanium dioxide, dicyandiamide and the like as raw materials, reacting to obtain a biguanidyl-containing bititanium dioxide silane intermediate; and carrying out high-temperature thermal polycondensation reaction on the hyperbranched double titanium dioxide silane biguanidyl hydrochloride and polyamidoamine to obtain the hyperbranched double titanium dioxide silane biguanidyl hydrochloride. And adding the hyperbranched double titanium dioxide silane biguanidyl hydrochloride into the melamine formaldehyde resin, and uniformly stirring to obtain the modified melamine formaldehyde resin. And finally, soaking the raw paper in the modified melamine formaldehyde resin, taking out, and airing to obtain the modified melamine impregnated paper. The mod