| Hydrothermal Method synthesizing Magnesium Hydroxide Sulfate Whiskers and flake MgSO4·5Mg(OH)2·2H2O powders using MgSO4 and Mg(OH)2 were described. The as-prepared samples were analyzed by chemical analysis and characterized by XRD, SEM and FT-IR spectra and so on. The mechanical and flame resistance properties of the whiskers added into high-density polyethylene(HDPE) were also studied in this paper.Based on the morphology and crystal structure of Magnesium Hydroxide Sulfate Whiskers, the different experiment conditions of hydrothermal synthesizing exercise different influence on synthesizing process. And the best technological conditions for preparing the Magnesium Hydroxide Sulfate Whiskers were put forward as : the concentration of MgSO4 is 1.28 mol·L-1; the mol rate of MgSO4 to Mg(OH)2 is 1～4; the reaction temperature is 200℃; the stir intensity is 450r/ min,and the reaction time is 6h.The nice morphology MgSO4·5Mg(OH)2·2H2O whiskers of about 20～45μm/ long and about 31 rate of long to diameter is obtained .Besides considering the hydrothermal conditions,adding additives(citric acid,phosphate) into the autoclave were investigated.The result showed that flake white powers were synthesized.According to processes of investigating whiskers,the flake powers were studied correlatively.The SEM shows that the morphology of the powder is flake,sector and samdwich,and long /2μm, thickness/0.052μm. Its molecular formulais MgSO4·5Mg(OH)2·2H2O.The optimal reactive synthesizing conditions for synthesizing the flake powers were brought forward as :MgSO4 :1.00mol·L-1;MgSO4 to Mg(OH)2 :0.65:0.25;200℃; 200r/min;5h.The results of tensile and flame tests of compound material showed the HDPE containing as-prepared whiskers had better overall properties,excessing the properties of HDPE/ Mg(OH)2.
|
PDF Full Text Request