Polyvinyl alcohol-based micro-crosslinking humidity-controlling material, preparation method thereof and application of polyvinyl alcohol-based micro-crosslinking humidity-controlling material in cigarette case

The invention discloses a polyvinyl alcohol-based micro-crosslinking humidity-controlling material, a preparation method thereof and application of the polyvinyl alcohol-based micro-crosslinking humidity-controlling material in a cigarette case. Stirring diatomite, a polyvinyl alcohol solution and a defoaming agent to form an emulsion; and adding citric acid into the emulsion to carry out esterification cross-linking reaction to obtain emulsion containing a reticular structure PVA/CA/diatomite compound, and uniformly mixing the emulsion with a calcium chloride solution and an emulsifier to obtain the polyvinyl alcohol-based micro-cross-linked humidity-controlling material. The humidity adjusting material has the effect of adjusting the environment humidity after being dried, can absorb moisture in the air in a humid environment, and can release the moisture adsorbed by the humidity adjusting material in a dry environment, so that the humidity in the cigarette case is buffered, the environment is in a relative