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A method for preparing polydopamine-modified montmorillonite nanomaterials by mechanical ball milling

A technology of mechanical ball milling and polydopamine, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of increasing the surface area of ​​montmorillonite, achieve obvious modification effect, universal applicability, and avoid waste liquid Effect

Active Publication Date: 2021-03-16
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the current situation that the existing solution modification method cannot mass-produce multifunctional nano-montmorillonite materials, and the deficiency of dopamine deposited by the solution method, the purpose of the present invention is to provide a method for preparing polydopamine-modified montmorillonite nano-materials by mechanical ball milling. The method uses the mechanical force of the ball mill to increase the surface area of ​​the montmorillonite, while physically modifying the montmorillonite, and at the same time chemically modifies the montmorillonite nanomaterials with dopamine to generate Reactive functional groups to improve the surface activity of montmorillonite nanomaterials

Method used

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  • A method for preparing polydopamine-modified montmorillonite nanomaterials by mechanical ball milling
  • A method for preparing polydopamine-modified montmorillonite nanomaterials by mechanical ball milling
  • A method for preparing polydopamine-modified montmorillonite nanomaterials by mechanical ball milling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Ball milling method:

[0048] Disperse 4g of montmorillonite (MMT) in 200ml of aqueous solution, stir rapidly, concentrate and take out for later use; take 4g of dopamine hydrochloride and add it to the buffer solution, add 8wt% hydrogen peroxide (oxidant) to the dopamine hydrochloride solution, Prepare dopamine hydrochloride solution, adjust the pH value, and add the concentrated MMT solution to the ball mill jar at the same time for ball milling; the diameter of the balls includes 2mm zirconia balls, 5mm zirconia balls, 10mm zirconia balls and 15mm zirconia balls , the mass ratio of the balls of each diameter is 4:8:20:5, the selected ball-to-material ratio is 30:1, the ball milling speed is 400r / min, after 30min, the MMT modified by dopamine hydrochloride is taken out, and after ultrasonic centrifugal cleaning, freeze-drying is carried out. The freeze-drying temperature is -40°C~-50°C, and the freeze-drying time is 48h, and the polydopamine-modified MMT (Bal-MMT30min...

Embodiment 2

[0055] Disperse 4g of MMT in 200ml of aqueous solution, stir quickly, concentrate and take out for later use; take 4g of dopamine hydrochloride and add it to the buffer solution, add 8wt% hydrogen peroxide to the dopamine hydrochloride solution, prepare dopamine hydrochloride solution, and adjust the pH value , and the concentrated MMT solution is added to the ball milling tank at the same time for ball milling; the diameter of the balls includes 2mm zirconia balls, 5mm zirconia balls, 10mm zirconia balls and 15mm zirconia balls, the mass ratio of the balls of each diameter 4:8:20:5, the ratio of ball to material is 20:1, the ball milling speed is 400r / min, after 60min, the MMT modified with dopamine hydrochloride is taken out, cleaned by ultrasonic centrifugation and then freeze-dried, the freeze-drying temperature is -40℃~ -50 ℃, lyophilization time of 48h, prepared polydopamine-modified MMT (Bal-MMT60min).

[0056] Image 6 It is the XRD diffraction spectrum of the Bal-MMT...

Embodiment 3

[0058] Disperse 4g of MMT in 200ml of aqueous solution, stir quickly, concentrate and take out for later use; take 4g of dopamine hydrochloride and add it to the buffer solution, add 8wt% hydrogen peroxide to the dopamine hydrochloride solution, prepare dopamine hydrochloride solution, and adjust the pH value , and the concentrated MMT solution is added to the ball milling tank at the same time for ball milling; the diameter of the balls includes 2mm zirconia balls, 5mm zirconia balls, 10mm zirconia balls and 15mm zirconia balls, the mass ratio of the balls of each diameter 4:8:20:5, the ball-to-material ratio was selected as 20:1, the ball milling speed was 400r / min, the MMT modified with dopamine hydrochloride was taken out after 90min, and then freeze-dried after ultrasonic centrifugal cleaning, and the freeze-drying temperature was -40°C~ The polydopamine-modified MMT (Bal-MMT90min) was prepared at -50°C and lyophilized for 48 hours.

[0059] Figure 7 It is the XRD diffr...

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Abstract

The invention discloses a method for preparing polydopamine-modified montmorillonite nanomaterials by a mechanical ball milling method, which comprises the following steps: (1) fully dispersing the prepared montmorillonite material in an aqueous solution, stirring rapidly, concentrating and taking it out for use; ( 2) adjust the pH value of the buffer solution, get dopamine hydrochloride and join in the buffer solution, prepare the dopamine hydrochloride solution, the concentration range of the dopamine hydrochloride solution is 0.2~1g / ml; (3) mix the dopamine hydrochloride solution with the concentrated montmorillonite solution At the same time, add it to the ball milling tank for ball milling. After ball milling for 0.3 to 6 hours, pour the mixed solution out of the ball milling tank, centrifuge to separate the solid and liquid, and then wash the solid product with deionized water for 3 to 6 times, and then remove the water in the product. Instantly. The present invention is based on the simultaneous physical modification of nanomaterials by ball milling and the chemical modification of dopamine on nanomaterials, and can quickly prepare dopamine-modified nanomaterials; the mechanical ball milling method involved in the present invention has universal applicability for surface modification of nanomaterials .

Description

technical field [0001] The invention belongs to the technical field of modification of nanometer materials, and in particular relates to a method for preparing polydopamine-modified montmorillonite nanomaterials by a mechanical ball milling method. Background technique [0002] In the field of modern material science research, in order to improve the application performance of materials, people often use the method of surface modification of materials to give new properties to the surface of materials. At present, the methods for surface modification of materials mainly include surface grafting, layer-by-layer self-assembly, and plasma treatment, etc., which can achieve the purpose of multifunctionalizing the surface of materials. The adhesion performance between the modified material and the substrate obtained by surface grafting treatment is limited; the layer-by-layer self-assembly wastes a lot of reagents in the experimental process; the effect of plasma treatment is mor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40C01B33/44B82Y30/00
CPCC01B33/40C01B33/44B82Y30/00C08K9/04C08K3/346C08K2201/011C08G61/12C08G2261/11C08G2261/3241C08G2261/43C08G73/026
Inventor 梁波石凯郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY