Polyvinylidene chloride (PVDC) copolymer latex for medicine packaging as well as preparation method and application thereof

The invention relates to latex for medicine packaging, in particular to polyvinylidene chloride (PVDC) copolymer latex for aqueous medicine packaging and a preparation method thereof. The polyvinylidene chloride (PVDC) copolymer latex for the medicine packaging is prepared by copolymerizing a mixed monomer, an emulsifier, an initiator, a pH modifier, an auxiliary agent and nanometer materials, wherein the polyvinylidene chloride (PVDC) copolymer latex comprises the following components by the total weight percent of the mixed monomer: 70-96 percent of vinylidene chloride, 3-25 percent of acrylate monomer and 2-5 percent of acrylonitrile; and the weight percentage of the emulsifier, the initiator, the pH modifier, the auxiliary agent and the nanometer materials is as follows respectively accounting for the total weight of the latex: 0.5-5 percent of unsaturated aliphatic acid, 0.5-2 percent of the emulsifier, 0.02-0.2 percent of the initiator, 0.005-0.02 percent of the pH modifier, 0.002-0.01 percent of the auxiliary agent and 0.003-0.02 percent of the nanometer materials. The polyvinylidene chloride (PVDC) copolymer latex for the medicine packaging has low latex viscosity, good softness, high barrier property and no crystallization point.