Method for enhancing surface property of montmorillonite by freeze-drying technology

A surface performance, montmorillonite technology, applied in the field of chemical materials, can solve the problems of uneven ball milling, fragmentation and deformation of montmorillonite sheets, and achieve the effects of simple method, improved dispersion performance and high efficiency

Pending Publication Date: 2019-05-31
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the ball milling process, as the ball milling time increases, it will cause the fragmentation and deformation of some montmorillonite sheets (Applied Clay Science, 2010, 47(3-4): 0-202), and it is easy to produce sample sticky balls and make the The ball milling effect is not uniform, and some montmorillonite treated by dry ball milling failed to maintain the stripping effect brought about by the modification of montmorillonite

Method used

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  • Method for enhancing surface property of montmorillonite by freeze-drying technology
  • Method for enhancing surface property of montmorillonite by freeze-drying technology
  • Method for enhancing surface property of montmorillonite by freeze-drying technology

Examples

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Effect test

Embodiment 1

[0036] Preparation of lyophilized Na-MMT:

[0037]Evenly disperse 3gNa-MMT in 300ml deionized water at high speed (the concentration of Na-MMT is 0.01g / ml), the dispersion speed is 6000rpm, remove the particles in the lower layer after standing, and take the upper layer suspension; the suspension is concentrated by rotary evaporation, rotated The temperature of the constant temperature pot of the evaporator is 65°C, and the rotation speed is 150rpm; continue to carry out ultrasonic dispersion to obtain a suspension of montmorillonite; pre-freeze the suspension of montmorillonite, the pre-freezing temperature is -20°C, and the pre-freezing time is 6h. Fully freeze the suspension; vacuum freeze-dry the pre-frozen montmorillonite suspension to obtain freeze-dried Na-MMT.

[0038] figure 1 It is the morphological figure of the freeze-dried Na-MMT obtained in this embodiment. It can be seen from the figure that Na-MMT is in the form of powder, while the freeze-dried Na-MMT is in t...

Embodiment 2

[0041] Preparation of lyophilized Ca-MMT:

[0042] Evenly disperse 3g Ca-MMT in 300ml deionized water at high speed (the concentration of Ca-MMT is 0.01g / ml), the dispersion speed is 6000rpm, remove the lower layer of particles after standing, take the upper layer suspension; concentrate the suspension by rotary evaporation, The temperature of the constant temperature pot of the rotary evaporator is 65 ° C, and the rotation speed is 150 rpm; continue to carry out ultrasonic dispersion to obtain a suspension of montmorillonite; pre-freeze the suspension of montmorillonite at -20 ° C, and the pre-freezing time is 6 hours , to fully freeze the suspension; vacuum freeze-dry the pre-frozen montmorillonite suspension to obtain freeze-dried Ca-MMT.

[0043] image 3 It is the appearance diagram of the freeze-dried Ca-MMT obtained in this embodiment. It can be seen from the figure that the Ca-MMT is in the form of powder, while the freeze-dried Ca-MMT is in the form of loose sheets. ...

Embodiment 3

[0046] Lyophilized OMMT preparation

[0047] Evenly disperse 3gOMMT in 300ml deionized water at high speed (the concentration of OMMT is 0.01g / ml), the dispersion speed is 6000rpm, remove the lower layer of particles after standing, and take the upper suspension; the suspension is concentrated by rotary evaporation, and the constant temperature of the rotary evaporator is The temperature of the pot is 65°C, and the rotation speed is 150rpm; continue to carry out ultrasonic dispersion to obtain a suspension of montmorillonite; pre-freeze the suspension of montmorillonite at -20°C, and the pre-freezing time is 6 hours, so that the suspension is fully Freeze; vacuum freeze-dry the pre-frozen montmorillonite suspension to obtain freeze-dried OMMT.

[0048] Figure 5 It is the appearance figure of the freeze-dried OMMT obtained in this embodiment. It can be seen from the figure that the OMMT is in the form of powder, while the freeze-dried OMMT is in the form of loose floc.

[00...

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Abstract

The invention discloses a method for enhancing the surface property of montmorillonite by a freeze-drying technology. According to the method, the dispersing property of the montmorillonite is improved by utilizing the freeze-drying technology, and then surface modification is carried out to enhance the surface property of the layered montmorillonite. The montmorillonite with good dispersibility is obtained by vacuum freeze-drying. The freeze-dried montmorillonite dispersed under optimized conditions is obtained by controlling the stirring speed, the dispersing degree and the freeze-drying time of the montmorillonite in water. The freeze-dried montmorillonite is subjected to dopamine surface modification to obtain modified montmorillonite. The method disclosed by the invention has the characteristics of simplicity in operation, good test reproducibility, high efficiency and the like; the layered montmorillonite with functional groups on the surface can be obtained, and a new way for solving the dispersibility and functionalization of inorganic montmorillonite and improving the compatibility of the montmorillonite and organic matters is provided.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and in particular relates to a method for enhancing the surface performance of montmorillonite by freeze-drying technology. Background technique [0002] Layered clay minerals have become a hotspot in the field of materials science and mineralogy because of their two-dimensional structure and unique interlayer domain environment. The study found that it is of great value to exfoliate such layered material sheets into nanosheets (Science , 2013, 340(6139):1226419). After the layered clay minerals are peeled off, their specific surface area and cation exchange capacity are greatly increased (Advances in Colloid & Interface Science, 1999, 82(1–3):43), which can realize material assembly and preparation of inorganic non-metallic substrates. new material. Exfoliated layered clays are widely used in the paper industry, flame retardants, polymer nanocomposites and other fields. [0003] Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40B82Y40/00
Inventor 梁波石凯梁缘郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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