A preparation method of PVDC emulsion for medicine package was introduced,and the optimal formulation and process of the PVDC emulsion were screened.The followings were studied using the method of controlling variables:The effect of the type and content of comonomers on the toughness and barrier properties of PVC/PVDC hard sheets,the effect of initiator content on the toughness and barrier properties of PVC/PVDC hard sheets,and the effect of emulsifier content on particle size and viscosity of emulsion and on oxygen permeability of PVC/PVDC hard sheets.The result showed:when the VDC mass fraction was between 89％and 91％,the VDC/MA system could achieve a balance between the barrier properties and damage rate of PVC/PVDC hard sheets;on the premise that the monomer react completely,it was best to use fewer initiators to ensure the breakage rate of the hard sheet;when the mass fraction of emulsifier is 1.8％-2.0％,the lower viscosity of emulsion and the better oxygen resistance of PVC/PVDC hard sheet could be balanced.
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