MTS有机改性白炭黑及其性能表征
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摘要
以甲基三氯硅烷(MTS)为改性剂,甲苯为溶剂,采用单因素轮换法对沉淀法白炭黑粉体进行有机改性,以提高其分散性和疏水性能。主要考察了反应温度、时间、MTS浓度对沉淀法制白炭黑的物化结构和性能的影响。使用X射线衍射仪、傅里叶红外光谱仪、热失重分析仪、BET比表面积和孔径分析仪等分析设备对改性前后白炭黑的结构形貌及其性能进行表征。结果表明:在反应温度为75℃、时间为90 min、改性剂MTS浓度为0.20 mol/L时,获得的改性白炭黑的分散性最好。MTS接枝后白炭黑物相结构仍为无定形结构,且孔径分布集中,孔径变窄为3~4nm,热稳定性增强,疏水性增强。
To improve the dispersivity and hydrophobicity,the precipitated silica powder was organically modified by methyltrichlorosilane( MTS) using as a solvent. The single factor rotation method was used to determine the best modification conditions. The effects of reaction temperature, time and MTS concentration on the physicochemical structure and properties of silica were investigated. The structure morphology and property of silica before and after modification were characterized by X-ray diffraction,Fourier transform infrared analysis, thermogravimetry, the pore structure was tested on a physical adsorption analyze. The results showed that the modified silica has the best dispersibility when the reaction temperature is 75 ℃,the time is 90 min,and the modifier MTS concentration is 0. 20 mol/L.The modified silica is still noncrystalline, and its phase structure had no change. The pore size distribution of silica was narrowed to 3 ~ 4 nm,and the thermal stability of the samples was enhanced,and the hydrophobicity is dramatically enhanced.
To improve the dispersivity and hydrophobicity,the precipitated silica powder was organically modified by methyltrichlorosilane( MTS) using as a solvent. The single factor rotation method was used to determine the best modification conditions. The effects of reaction temperature, time and MTS concentration on the physicochemical structure and properties of silica were investigated. The structure morphology and property of silica before and after modification were characterized by X-ray diffraction,Fourier transform infrared analysis, thermogravimetry, the pore structure was tested on a physical adsorption analyze. The results showed that the modified silica has the best dispersibility when the reaction temperature is 75 ℃,the time is 90 min,and the modifier MTS concentration is 0. 20 mol/L.The modified silica is still noncrystalline, and its phase structure had no change. The pore size distribution of silica was narrowed to 3 ~ 4 nm,and the thermal stability of the samples was enhanced,and the hydrophobicity is dramatically enhanced.
引文
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[2]TBYERS J.Silane coupling agents for enhanced silica performance[J].Rubber World,1998,218(9):37-38.
[3]Yan Y Y,Gao N,Barthlott W.Mimicking natural superhydrophobic surfaces and grasping the wetting process:a review on recent progress in preparing superhydrophobic surfaces[J].Advances in Colloid&Interface Science,2011,169(2):80-105.
[4]BR HWILER D.Postsynthetic functionalization of mesoporous silica[J].Nanoscale,2010,2(6):887-892.
[5]Li Y,Zeng H.A new surface modification method to improve the dispersity of nano-silica in organic solvents[J].Journal of Sol-Gel Science and Technology,2011,58(1):290-295.
[6]EL-WAKIL E A,BARAKAT M A.Study of the effect of natural rubber-graft-o-aminophenol on the thermal stability and mechanical properties of nitrile rubber[J].Journal of Applied Polymer Science,2010,119(4):2461-2467.
[7]Wong J X H,Asanuma H,Yu H Z.Simple and reproducible method of preparing transparent superhydrophobic glass[J].Thin Solid Films,2012,522(522):159-163.
[8]崔凌峰,熊玉竹,李鑫,等.Si69有机湿法改性白炭黑及其性能表征[J].人工晶体学报,2016,45(6):1664-1669.
[9]何星星.超(亚)临界水热活化联合盐酸酸浸提取煤矸石中硅、铝的研究[D].太原:太原理工大学,2017.
[10]宋英泽,宋丽贤,卢忠远,等.超声辅助沉淀法制备疏水性纳米Si O2[J].人工晶体学报,2012,41(2):474-478.
[11]石从云,欧廷雄,钱凡,等.光棒废料中提取的白炭黑的疏水化改性[J].中国粉体技术,2016,22(6):50-53.
[12]DUBOIS L H,ZEGARSKI B R.Reaction of alkoxysilane coupling agents with dehydroxylated silica surfaces[J].Journal of the American Chemical Society,1993,115(3):1190-1191.
[13]王兵辉,熊玉竹,吴胜学,等.离子液体改性白炭黑及性能表征[J].人工晶体学报,2017,46(9):1851-1857.