聚苯乙烯包覆硝酸铵改善吸湿性的研究

采用相分离法制备了聚苯乙烯(PS)包覆硝酸铵(AN),研究了甲苯和正己烷体积比、聚苯乙烯与硝酸铵质量比、混合溶剂与硝酸铵配比、沉淀剂加入速度等因素对聚苯乙烯包覆硝酸铵性能的影响。用吸湿降低率评价聚苯乙烯对硝酸铵包覆程度。结果表明,聚苯乙烯包覆硝酸铵的较佳工艺条件为甲苯与正己烷体积比为1∶3,混合溶剂/AN=3.5 mL/g,室温,沉淀剂滴速10滴/min。包覆60目硝酸铵,PS质量分数为1.54%,包覆AN吸湿降低率75%。硝酸铵目数增大,达到相同吸湿降低率,PS用量显著增大。

Study on hygroscopicity of ammonium nitrate particle coated by polystyrene

The phase separation method was used in preparation of the ammonium nitrate particles with polystyrene.The effects of the volume ratio of toluene and n-hexane,the mass ratio of polystyrene and ammonium nitrate,the ratio of ammonium nitrate and mixed solvent and the precipitating agent addition rate on the covering situations of ammonium nitrate particles were investigated.The results showed that the ammonium nitrate process conditions of polystyrene-coated ammonium nitrate are 1：3 of volume ratio of toluene and n-hexane,3.5 ml/g of ratio of mixed solvent and ammonium nitrate,room temperature,and 6 sec/drop of addition rate of precipitating agent.When the 60 mesh ammonium nitrate was coated with polystyrene and the mass ratio of polystyrene and ammonium nitrate was 1.54%,the reduction of moisture rate was 75%.When the mesh number of ammonium nitrate was increased and the reduction of moisture rate was equal,the required polystyrene amount was significantly increased