Difluoroalkyl ester polymer fabric finishing agent and its preparation method

The invention discloses a difluoroalkyl ester polymer fabric finishing agent and its preparation method. The ester polymer fabric finishing agent having a good stability is obtained through the utilization of ammonium persulfate to initiate radical copolymerization of mixed monomers of difluoroalkyl itaconic acid, butyl acrylate, methyl methacrylate and acrylamide under the action of a complex formulation emulsifier. The short-fluorocarbon-chain polymer type water and oil resistant finishing agent is obtained through the free radical emulsion copolymerization by treating the difluoroalkyl itaconic acid as a fluorine-containing functional monomer, and can provide an excellent water and oil resistant effect when the finishing agent is applied in the cotton fabric finishing; and the preparation method has the advantages of simple technology, mild reaction condition, and suitableness for the industrialized production.