HA/TiO 2 composite coating were fabricated via adding TiO 2 powder in the electrolyte by electrodeposition.The influence of current dens ity and deposition time on the content of TiO 2 in the coating,the influence of ...HA/TiO 2 composite coating were fabricated via adding TiO 2 powder in the electrolyte by electrodeposition.The influence of current dens ity and deposition time on the content of TiO 2 in the coating,the influence of the content of TiO 2 in the coating on the bonding strength of coating and the influence of sinte ring temperature on the structure and the bonding strength of coating were inves tigated.The experiment results show that the content of TiO 2 in the coating increase with reducing the current density and prolonging the deposition time,the bonding strength improve with increasing the content of TiO 2 in the coating,which can obtain18.7MPa when the weight percent TiO 2 in the coating attain72.2%.The addition of TiO 2 in the coating reduces the thermal expansion co - efficient of the coating,improves the bonding strength of coating and change s the fracture mechanism of the coat - ing from adhesion failure to cohesive failure.HA in the composite coatings i s decomposed by the catalysis reac - tion of TiO 2 at the temperature of sinter850 ℃ .Differential scanning calorimetry and X - ray diffractometry analy - ses showed that the chemical reaction between HA and TiO 2 lead to the product are α- TCP and CaTiO 3 at the temperature of sinter1200 ℃ .In order to prevent the coating from decomposing and attain hign bonding st rength,the sintering temperature should be less than820 ℃ .展开更多
目的探讨利乐包装废弃物/高密度聚乙烯阻燃木塑材料的热重动力学。方法以利乐包装废弃物和高密度聚乙烯为原材料,以马来酸酐接枝聚乙烯、硬脂酸金属皂和聚磷酸铵及三聚氰胺分别为耦联剂、润滑剂和阻燃剂,增强材料为玄武岩纤维;采用挤出...目的探讨利乐包装废弃物/高密度聚乙烯阻燃木塑材料的热重动力学。方法以利乐包装废弃物和高密度聚乙烯为原材料,以马来酸酐接枝聚乙烯、硬脂酸金属皂和聚磷酸铵及三聚氰胺分别为耦联剂、润滑剂和阻燃剂,增强材料为玄武岩纤维;采用挤出法和注塑法制备阻燃性TPP/HDPE木塑复合材料,并采用热重分析方法,在升温速率为5,10,20℃/min的条件下,探讨TPP/HDPE复合材料在20~700℃的热降解动力学行为。结果 Kissinger法研究结果显示,与仅采用聚磷酸铵和三聚氰胺作为阻燃剂的TPP/HDPE复合材料相比,采用聚磷酸铵、三聚氰胺和玄武岩纤维作为复合阻燃剂,可以提高木塑复合材料的活化能,添加玄武岩纤维可进一步提高利乐包装/聚乙烯复合材料的热稳定性;采用Coats-Redfern方法计算聚磷酸铵、三聚氰胺和玄武岩纤维作为复合阻燃剂的TPP/HDPE复合材料的动力学参数表明,复合材料热解反应第1阶段和第2阶段的表观活化能分别为35.26,171.16 k J/mol。结论研究结果为解决纸/铝/塑包装废弃物污染的回收综合利用探索了一条新的途径,研制的复合材料具有良好的力学和防火性能,可用于地板、墙板等建筑领域及包装领域。展开更多
文摘HA/TiO 2 composite coating were fabricated via adding TiO 2 powder in the electrolyte by electrodeposition.The influence of current dens ity and deposition time on the content of TiO 2 in the coating,the influence of the content of TiO 2 in the coating on the bonding strength of coating and the influence of sinte ring temperature on the structure and the bonding strength of coating were inves tigated.The experiment results show that the content of TiO 2 in the coating increase with reducing the current density and prolonging the deposition time,the bonding strength improve with increasing the content of TiO 2 in the coating,which can obtain18.7MPa when the weight percent TiO 2 in the coating attain72.2%.The addition of TiO 2 in the coating reduces the thermal expansion co - efficient of the coating,improves the bonding strength of coating and change s the fracture mechanism of the coat - ing from adhesion failure to cohesive failure.HA in the composite coatings i s decomposed by the catalysis reac - tion of TiO 2 at the temperature of sinter850 ℃ .Differential scanning calorimetry and X - ray diffractometry analy - ses showed that the chemical reaction between HA and TiO 2 lead to the product are α- TCP and CaTiO 3 at the temperature of sinter1200 ℃ .In order to prevent the coating from decomposing and attain hign bonding st rength,the sintering temperature should be less than820 ℃ .
基金State Scholarship Foundation of China(201406215002)Chinese National S&T Major Project(ZX06901)Tsinghua University Initiative Scientific Research Program(20121088038)~~
文摘目的探讨利乐包装废弃物/高密度聚乙烯阻燃木塑材料的热重动力学。方法以利乐包装废弃物和高密度聚乙烯为原材料,以马来酸酐接枝聚乙烯、硬脂酸金属皂和聚磷酸铵及三聚氰胺分别为耦联剂、润滑剂和阻燃剂,增强材料为玄武岩纤维;采用挤出法和注塑法制备阻燃性TPP/HDPE木塑复合材料,并采用热重分析方法,在升温速率为5,10,20℃/min的条件下,探讨TPP/HDPE复合材料在20~700℃的热降解动力学行为。结果 Kissinger法研究结果显示,与仅采用聚磷酸铵和三聚氰胺作为阻燃剂的TPP/HDPE复合材料相比,采用聚磷酸铵、三聚氰胺和玄武岩纤维作为复合阻燃剂,可以提高木塑复合材料的活化能,添加玄武岩纤维可进一步提高利乐包装/聚乙烯复合材料的热稳定性;采用Coats-Redfern方法计算聚磷酸铵、三聚氰胺和玄武岩纤维作为复合阻燃剂的TPP/HDPE复合材料的动力学参数表明,复合材料热解反应第1阶段和第2阶段的表观活化能分别为35.26,171.16 k J/mol。结论研究结果为解决纸/铝/塑包装废弃物污染的回收综合利用探索了一条新的途径,研制的复合材料具有良好的力学和防火性能,可用于地板、墙板等建筑领域及包装领域。
