Electrostatic self-assembly method for preparing halloysite-white carbon black hybrid filler

A technology of electrostatic self-assembly and white carbon black, which is applied in the field of preparation of new hybrid materials, achieves the effect of simple molding process, high specific surface area, and large-scale industrial application

Active Publication Date: 2016-09-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hybrid fillers prepared by using the two fillers of halloysite nanotubes and silica particles have not been reported yet.

Method used

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  • Electrostatic self-assembly method for preparing halloysite-white carbon black hybrid filler
  • Electrostatic self-assembly method for preparing halloysite-white carbon black hybrid filler
  • Electrostatic self-assembly method for preparing halloysite-white carbon black hybrid filler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a 250ml beaker, add a mixture of 100ml absolute ethanol, 5ml deionized water and 4.5g of 25wt% ammonia water, stir for 0.5 hour, then dropwise add 4.5g of tetraethyl orthosilicate to the mixture, after the dropwise addition, Stir for 12 hours to obtain white carbon black, then wash and dry the prepared white carbon black with water, take 3g and disperse it in 100ml of ethanol, add 1g of γ-aminopropyltriethoxysilane, and stir and react at 60°C for 10 hours , the product was centrifuged and washed three times with ethanol, and dried in a vacuum oven at 80°C to obtain modified white carbon black. figure 1 It is the infrared spectrogram of silica and modified silica, which shows that at 2924cm -1 and 2849cm -1 A distinct CH is generated at 2 Vibration peak, which indicates that the silane coupling agent has been successfully grafted to the surface of silica. figure 2 It is the Zeta potential diagram of modified silica and halloysite nanotubes. It can be seen from the...

Embodiment 2

[0035] Disperse 10g of industrial-grade precipitated silica into 150ml of absolute ethanol, add 2g of γ-aminopropyltrimethoxysilane, react at 70°C for 10h, centrifuge the obtained modified silica, and wash with absolute ethanol Washed 3 times to obtain modified silica. image 3 is a thermogravimetric graph of silica and modified silica, and the thermogravimetric data of this graph shows that the grafting rate of the silane coupling agent is 3.6%. Get 2g of modified silicon dioxide and disperse it into 100ml deionized water. In addition, prepare 100ml concentration of 30wt% halloysite nanotube water dispersion, then add the modified silicon dioxide dispersion to the halloysite nanotube In the dispersion liquid, let it stand for 1h to obtain a hybrid filler, such as Figure 4 It can be seen from the figure that the halloysite surface is covered by a layer of nano-protrusions of silica, forming a unique structure, and the halloysite tubes and silica particles do not undergo self...

Embodiment 3

[0037] Disperse 5g of halloysite nanotubes in 100ml of 95% ethanol solution, add 1g of N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, and react at 70°C for 12 hours, Centrifugal washing three times, adjusting the pH value to 7, and then drying in a vacuum oven at 80°C for 10 hours to obtain modified halloysite nanotubes; Figure 5 It is the infrared spectrum of halloysite and modified halloysite. It can be seen from the figure that the coupling agent is successfully grafted to the surface of the nanotube. Take 3g of modified halloysite nanotubes and disperse them into 100ml of deionized water. At the same time, the same quality of white carbon black is also dispersed into 100ml of deionized water, ultrasonically disperse for 30min, and then drop the modified halloysite nanotube solution Add it to the dispersion of silica and let it stand for 2 hours. The positively charged halloysite nanotubes and the negatively charged precipitation silica will settle by electrostatic a...

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Abstract

The invention discloses an electrostatic self-assembly method for preparing a halloysite-white carbon black hybrid filler. The method comprises the following steps: dispersing an inorganic filler A into a solvent, adding a silane coupling agent which accounts for 10-30 wt% of the inorganic filler, stirring to react at 50-100 DEG C for 5-20 hours, carrying out centrifugal filtration, washing and drying to obtain a modified filler A; and dispersing the modified filler A into a solvent to prepare a suspension with the solid content of 1-50%, mixing the suspension with an inorganic filler B suspension, standing for 1-3 hours, and pouring out the supernate to obtain the hybrid filler. The hybrid filler can effectively lower the phenomenon of respective aggregation of the fillers, and has a favorable interface binding action with the polymer matrix. Besides, the white carbon black nano bulges on the halloysite surface provide more active surfaces, thereby providing more reactive groups for the functional filler. Thus, the hybrid filler has wide application prospects in the field of high-performance multifunctional composite materials.

Description

technical field [0001] The invention relates to the technical field of preparation of novel hybrid materials, in particular to a method for preparing halloysite-white carbon black hybrid fillers by electrostatic self-assembly. Background technique [0002] The development of polymer composites is inseparable from the wide application of inorganic fillers. The addition of inorganic fillers to the polymer matrix can endow the composite with excellent mechanical properties, flame retardancy, thermal stability, etc. However, due to the presence of hydroxyl groups on the surface of inorganic fillers, these nanofillers are very easy to agglomerate together, and it is difficult to achieve uniform dispersion in the polymer matrix, which seriously deteriorates many properties of composite materials. With the continuous improvement of people's requirements for high performance and functionalization of composite materials, the preparation of new fillers has become particularly importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/06C08K3/36C08K7/00C08K3/34
CPCC08K3/34C08K3/36C08K7/00C08K9/06C08K2201/011
Inventor 贾志欣胡德超钟邦超罗远芳贾德民
Owner SOUTH CHINA UNIV OF TECH
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