Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Modified bentonite ultralow-shrinkage cement-based nano-porous material and preparation method thereof
The invention relates to the technical field of shrinkage control of cement-based nano-porous materials, and discloses a modified bentonite ultralow-shrinkage cement-based nano-porous material and a preparation method thereof. Bentonite is modified with an organic ammonium salt with a hydrophobic group or a derivative of hydrocarbon with a hydrophobic chain at one end and a hydroxyl, carboxyl or aldehyde group at the other end, the organic ammonium salt with hydrophobic groups and cations of the bentonite are subjected to cation exchange, or hydrophilic hydroxyl, carboxyl or aldehyde groups are adsorbed and grafted on a bentonite sheet layer, and the hydrophobic groups can enable the surface of the bentonite to be changed from hydrophilicity to lipophilicity, and can also play a role in blocking or filling interlayer pore channels, so that the interlayer spacing of the montmorillonite is increased, and the shrinkage caused by the change of the pore channel is reduced. Moreover, water molecules cannot enter interlayer pore channels, and shrinkage caused by water loss in the pores can be reduced.
本发明涉及水泥基纳米多孔材料收缩控制技术领域，公开了改性膨润土超低收缩水泥基纳米多孔材料及其制备方法，采用带有疏水基团的有机铵盐或一端有憎水链另一端含有羟基、羧基或醛基的烃的衍生物对膨润土改性，带有疏水基团的有机铵盐与膨润土的阳离子发生阳离子交换，或具有亲水性的羟基、羧基或醛基吸附、接枝在膨润土片层上，疏水基团能够使膨润土表面由亲水性变为亲油性，还能起到阻塞或填充层间孔道的作用，增大蒙脱石层间距，进而减少孔道变化引起的收缩；而且水分子也无法进入层间孔道内，还能降低由于孔中水分散失引起的收缩。
Modified bentonite ultralow-shrinkage cement-based nano-porous material and preparation method thereof
The invention relates to the technical field of shrinkage control of cement-based nano-porous materials, and discloses a modified bentonite ultralow-shrinkage cement-based nano-porous material and a preparation method thereof. Bentonite is modified with an organic ammonium salt with a hydrophobic group or a derivative of hydrocarbon with a hydrophobic chain at one end and a hydroxyl, carboxyl or aldehyde group at the other end, the organic ammonium salt with hydrophobic groups and cations of the bentonite are subjected to cation exchange, or hydrophilic hydroxyl, carboxyl or aldehyde groups are adsorbed and grafted on a bentonite sheet layer, and the hydrophobic groups can enable the surface of the bentonite to be changed from hydrophilicity to lipophilicity, and can also play a role in blocking or filling interlayer pore channels, so that the interlayer spacing of the montmorillonite is increased, and the shrinkage caused by the change of the pore channel is reduced. Moreover, water molecules cannot enter interlayer pore channels, and shrinkage caused by water loss in the pores can be reduced.
本发明涉及水泥基纳米多孔材料收缩控制技术领域，公开了改性膨润土超低收缩水泥基纳米多孔材料及其制备方法，采用带有疏水基团的有机铵盐或一端有憎水链另一端含有羟基、羧基或醛基的烃的衍生物对膨润土改性，带有疏水基团的有机铵盐与膨润土的阳离子发生阳离子交换，或具有亲水性的羟基、羧基或醛基吸附、接枝在膨润土片层上，疏水基团能够使膨润土表面由亲水性变为亲油性，还能起到阻塞或填充层间孔道的作用，增大蒙脱石层间距，进而减少孔道变化引起的收缩；而且水分子也无法进入层间孔道内，还能降低由于孔中水分散失引起的收缩。
Modified bentonite ultralow-shrinkage cement-based nano-porous material and preparation method thereof
改性膨润土超低收缩水泥基纳米多孔材料及其制备方法
JIANG JUN (Autor:in) / LI JUN (Autor:in) / LU ZHONGYUAN (Autor:in) / YANG YING (Autor:in)
05.11.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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