Low-contraction high-temperature-resistant thermocured organic impregnant and preparation method thereof

The invention discloses a low-contraction high-temperature-resistant thermocured organic impregnant, and relates to the technical field of an impregnant. The impregnant comprises the following components, by mass part, 100 parts of (methyl) acrylic-acid-terminated polysiloxane, 10-30 parts of a (methyl) acrylate monomer, 0.02-1 part of a polymerization inhibitor, 2-10 parts of a washable modifier, and 0.01-0.5 part of a free-radical polymerization heat initiator. The impregnant takes (methyl) acrylic-acid-terminated polysiloxane as a main monomer, and a cured product of the monomer has certain elasticity, so that the risk problem of secondary leakage due to great contraction in a polymerization process of a conventional (methyl) acrylate monomer is overcome, and the temperature resistance of the cured product is greatly improved. Through addition of the novel washable modifier, the washability of the organic impregnant is greatly improved, and the problem of residual adhesive left on the surface of an impregn