A kind of preparation method of kaolinite nano sheet

A technology of kaolinite and nanosheets, which is applied in the field of nanomaterials, can solve the problems of inconsistent intercalation rate and effect, large changes in particle size and shape, and difficulty in control, so as to achieve product morphology with intact sheet structure and simple process , The effect of improving chemical activity

Active Publication Date: 2018-09-18
无锡菲勒高性能材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some kaolinite sheets are peeled off by repeated intercalation, but this method generally causes the kaolinite sheets to curl to form kaolinite tubes, and it is difficult to obtain kaolinite nanosheets
The intercalation rate and effect of this method are different, the particle size and shape of the product change greatly, it is difficult to control, the recovery of intercalated organic matter is difficult, the production cost is high, and the cycle is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A1. Calcining and activation treatment. The kaolinite powder is placed in a muffle furnace and calcined at 600°C for 1.5 hours. After cooling down, the activated kaolinite powder is collected and prepared.

[0016] A2. Disperse the activated kaolinite powder obtained from A1 in a mixed solution of ethanol and water (mass ratio of ethanol to water 2:10) as a particle morphology control agent at a mass ratio of 1:12, and stir to make slurry , The slurry is transferred into the high-pressure reaction vessel, and the reaction is carried out under 200°C with magnetic stirring for 24 hours. After centrifugal solid-liquid separation, the slurry is dried and broken up at 100°C to prepare kaolinite nanosheets. The obtained kaolinite nanosheets have an average thickness of 36 nanometers and an average diameter of 170 nanometers.

Embodiment 2

[0018] A1. Calcining and activation treatment. The kaolinite powder is placed in a muffle furnace and calcined at 700°C for 1 hour. After cooling down, the activated kaolinite powder is collected and prepared.

[0019] A2. Disperse the activated kaolinite powder obtained from A1 in a mixed solution of dimethyl sulfoxide and water as a particle morphology regulator at a mass ratio of 1:10 (the mass ratio of dimethyl sulfoxide to water is 3 : 10), stirring the slurry, transfer the slurry into the autoclave, at 180 ℃, magnetic stirring reaction for 36 hours, after centrifugal solid-liquid separation, drying at 100 ℃, break up, make high Lingshi nanosheets. The obtained kaolinite nanosheets have an average thickness of 30 nanometers and an average diameter of 140 nm.

Embodiment 3

[0021] A1. Calcining and activation treatment. The kaolinite powder is placed in a muffle furnace and calcined at 600°C for 2 hours. After cooling down, the activated kaolinite powder is collected and prepared.

[0022] A2. Disperse the activated kaolinite powder obtained from A1 in the mixed solution of lithium chloride and water (the mass ratio of lithium chloride to water 3:10) as the particle morphology control agent at a mass ratio of 1:8 , Stir the slurry, transfer the slurry into the high-pressure reactor, and react with magnetic stirring for 48 hours at 210°C. After centrifugal solid-liquid separation, dry and break up at 100°C to prepare kaolinite nanosheets. . The obtained kaolinite nanosheet has an average thickness of 20 nanometers and an average diameter of 120 nm.

[0023] The invention is characterized in that it adopts calcination activation and shape control technology to prepare kaolinite nano-sheets through one hydrothermal reaction. The process is simple, the r...

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Abstract

The invention discloses a preparation method of kaolinite nanosheets. The method comprises the following steps: A1. calcination activating treatment: calcining kaolinite at the high temperature of 500-800 DEG C for 1-4 hours, and cooling to obtain calcined kaolinite; A2. carrying out ultrasonic or mechanical stirring on the calcined kaolinite obtained by the step A1 so that the calcined kaolinite is dispersed in a mixed solution of ethanol, dimethylsulfoxide or lithium chloride and water as a granular morphological control agent, wherein the mass ratio of the control agent to water is (1-6):10, and the mass ratio of the calcined kaolinite to the mixed solution is 1:(5-20); and stirring to react at 180-240 DEG C in a pressure reaction kettle for 12-48 hours, cooling, carrying out solid-liquid separation by using a centrifuge, drying, and dispersing to finally obtain the kaolinite nanosheets. The kaolinite nanosheets have regular sheet shape and uniform sheet size, and do not have the phenomenon of tubes formed by coiling.

Description

Technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a preparation method of kaolinite nanosheets. Background technique [0002] Kaolinite is a 1:1 type layered silicate mineral. It generally has a regular hexagonal lamella stacking structure. Its basic lamella unit is composed of a silicon-anion tetrahedron and an aluminum oxide octahedron. The layers are connected by interlayer hydrogen bonds and have a natural nanosheet structure. It has a wide range of applications in traditional papermaking, fillers, ceramics and other fields. Because nano materials have surface effects, small size effects, quantum size effects and macro quantum tunnel effects, etc., and their new characteristics and application effects. The research and preparation of nano-kaolinite has attracted widespread attention at home and abroad, and it has broad application prospects in polymer functional fillers, drug carriers, chemical catalysis, and bioelectrode...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01B33/40B82Y40/00
CPCC01B33/40C01P2004/62
Inventor张乾陈俊涛张白梅朱晓波陆银平张玉德
Owner无锡菲勒高性能材料有限公司