Concrete hydrophobing agent prepared through crosslinking modification of polycarboxylic acid as well as preparation method and application of concrete hydrophobing agent

The invention belongs to the technical field of preparation of additives, and discloses a concrete hydrophobing agent prepared by crosslinking modification of polycarboxylic acid and a preparation method and application thereof. The concrete hydrophobing agent prepared through polycarboxylic acid crosslinking modification is finally obtained through ATRP initiator functional modification, ATRP hydrophilic segment polymerization, ATRP hydrophobic segment polymerization, hydrolysis, macromolecular 1-chain amidation reaction, macromolecular 1-chain free radical polymerization, macromolecular 2-chain Schiff base reaction, macromolecular 2-chain free radical polymerization and Diels-Alder reaction. The concrete hydrophobing agent prepared through crosslinking modification of polycarboxylic acid can significantly enhance the hydrophobic capacity, erosion resistance and durability of concrete, can solve the problems of existing concrete hydrophobing agents, and is suitable for large-scale popularization and applicat