| In this paper, nano-scale Ca(OH)2 was synthesized by the method of liquid-control-precipitation. The particle sizes and properties of nano-scale Ca(OH)2 were characterized by TEM, IR, TG-DTA, XRDT and BET etc. The relationship of reaction conditions and particle size, shape and yield were discussed, and the efficient of agglomeration-preventing by various drying methods were investigated, nano-scale Ca(OH)2-LDPE complex films were prepared and treated by artificial accelerated aging test and soaked in 0.1 M HAc solution.The results indicated that, using CaCl2 and NaOH solution as raw materials, nano-scale Ca(OH)2 can be prepared by liquid-control-precipitation method. Ultrasonic bath can prevent agglomeration of particles and increase yield. The shape of the particles varied with the variety polymers and their concentrations, which suggested that the particles were templated by the polymers, among which PVA124 had a distinguished affect. Different drying method were used to treat the Ca(OH)2 wet gel. The results showed that the size of particles readily increased with the use of direct drying method, however, the agglomeration of the particles was effectively prevented with the use of solvent exchange, freeze-drying, especially heterogeneous azeotropic distillation. TEM and XRD indicated that the size of the primary particles were smaller than 50 nm when treated with heterogeneous azeotropic distillation. Compared with current PE film, nano-scale Ca(OH)2-LDPE complex film has extinguish mechanical properties and degradable abilities.
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