以液体硅酸钠和硫酸为原料,在室温下反应合成沉淀白炭黑,并用三甲基氯硅烷(TMCS)对其进行表面改性。采用正交实验设计法研究改性剂的用量、改性时间、改性温度、异丙醇的加入量等因素对改性效果的影响,得出适宜工艺为:改性剂用量为20%(...以液体硅酸钠和硫酸为原料,在室温下反应合成沉淀白炭黑,并用三甲基氯硅烷(TMCS)对其进行表面改性。采用正交实验设计法研究改性剂的用量、改性时间、改性温度、异丙醇的加入量等因素对改性效果的影响,得出适宜工艺为:改性剂用量为20%(质量分数),改性时间为90 m in,异丙醇用量为15 mL,改性温度为98℃。在此条件下,改性产品亲油化度超过30%,得到疏水性良好的二氧化硅产品。展开更多
Hydrophobic magnesium hydroxide(MH) nanoparticles were prepared by a one-step synthesis method in a high-gravity environment generated by a novel impinging stream–rotating packed bed(IS-RPB) reactor. The reactant sol...Hydrophobic magnesium hydroxide(MH) nanoparticles were prepared by a one-step synthesis method in a high-gravity environment generated by a novel impinging stream–rotating packed bed(IS-RPB) reactor. The reactant solutions were simultaneously and continuously pumped into the IS-RPB reactor, and then Tween80 was added as a surface modifier. The morphology, structure, and properties of blank and hydrophobic MH were characterized. The effects of MH nanoparticles on the flame retardancy, thermal stability, and mechanical properties of PP/MH composites were also studied. We found that the obtained MH nanoparticles exhibited hexagonal lamella with a mean size of 30 nm, excellent hydrophobic properties(e.g., high water contact angle of 112°), and improved thermal stability of MH. The limiting oxygen index(LOI) further showed that increased MH loading can significantly improve flame-retardant performance, which reached 29.3% for PP/MH composites with 30 wt% hydrophobic samples. The thermal stability and mechanical properties of the PP/MH composites with hydrophobic samples were also much higher than those of PP/MH composites with blank MH. Results showed that the one-step synthesis had high potential application in the large-scale production of hydrophobic MH nanoparticles.展开更多
文摘以液体硅酸钠和硫酸为原料,在室温下反应合成沉淀白炭黑,并用三甲基氯硅烷(TMCS)对其进行表面改性。采用正交实验设计法研究改性剂的用量、改性时间、改性温度、异丙醇的加入量等因素对改性效果的影响,得出适宜工艺为:改性剂用量为20%(质量分数),改性时间为90 m in,异丙醇用量为15 mL,改性温度为98℃。在此条件下,改性产品亲油化度超过30%,得到疏水性良好的二氧化硅产品。
基金Supported by the National Natural Science Foundation of China(21376229)the Science and Technology of Shanxi Province(2015031019-5)the Natural Science Foundation for Young Scientists of Shanxi Province(2015021033)
文摘Hydrophobic magnesium hydroxide(MH) nanoparticles were prepared by a one-step synthesis method in a high-gravity environment generated by a novel impinging stream–rotating packed bed(IS-RPB) reactor. The reactant solutions were simultaneously and continuously pumped into the IS-RPB reactor, and then Tween80 was added as a surface modifier. The morphology, structure, and properties of blank and hydrophobic MH were characterized. The effects of MH nanoparticles on the flame retardancy, thermal stability, and mechanical properties of PP/MH composites were also studied. We found that the obtained MH nanoparticles exhibited hexagonal lamella with a mean size of 30 nm, excellent hydrophobic properties(e.g., high water contact angle of 112°), and improved thermal stability of MH. The limiting oxygen index(LOI) further showed that increased MH loading can significantly improve flame-retardant performance, which reached 29.3% for PP/MH composites with 30 wt% hydrophobic samples. The thermal stability and mechanical properties of the PP/MH composites with hydrophobic samples were also much higher than those of PP/MH composites with blank MH. Results showed that the one-step synthesis had high potential application in the large-scale production of hydrophobic MH nanoparticles.
