Preparation of alginate-chitosan phase change heat storage microcapsules

Both alginate and chitosan are cheap and environmental friendly natural polymers,which have bright prospects for development and application. Phase change heat storage microcapsules were prepared with binary fatty alcohol as the core and sodium alginate chitosan as shell by emulsification-gelation,thus solving the problem of leaking of fatty alcohol during-phase changing. The effect of dosages of core materials and CaCO3,emulsifier and concentrations of chitosan on the properties of the microcapsules was investigated. The microcapsules were characterized by DSC,SEM,laser particle size analyzer and temperature-time curves. The results showed that the prepared microcapsules have the phase change temperature 37. 9 ℃,temperature adjustment range 37. 9 ~ 40. 8 ℃,latent heat 52. 8 J/g,and binary fatty alcohol encapsulation efficiency 44. 7%.