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Preparation method of alkylated modified graphene

A technology of alkylation modification and graphene, which is applied in graphene, chemical instruments and methods, inorganic chemistry, etc. It can solve problems such as difficulty in dispersing, failure to fully exert the excellent properties of graphene, and affecting interfacial binding force, etc.

Active Publication Date: 2016-11-16
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the van der Waals force between graphene sheets, the sheets are easy to stack and difficult to disperse
The traditional melt blending method uses the direct feeding of graphene powder. Since graphene is wrapped by molten high-viscosity polymer, the effective dispersion of graphene cannot be guaranteed, so that the excellent performance of graphene cannot be fully utilized.
Graphene is an inorganic material, which has poor interface compatibility with polymers, which affects the interfacial bonding force between it and polymers, and makes its mechanical properties fail to be effectively improved.
Patent CN201210078324 and patent CN201510165000 use silane coupling agent to modify graphene to improve its dispersion and compatibility, but the reduced graphene surface active groups are less, grafting is difficult, and graphene powder that has been agglomerated It is difficult to carry out secondary dispersion, which has a great impact on material properties

Method used

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  • Preparation method of alkylated modified graphene

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Experimental program
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Effect test

Embodiment 1

[0030] A kind of preparation method of alkylation modified graphene, comprises the steps:

[0031] 1) Cleavage of graphite oxide while introducing alkyl chains

[0032] Dissolve 100g of PSS, 10g of BYK and 100g of octadecylamine in a mixed solvent of 9700g of ethanol + water (ethanol: water = 5: 1), then add 100g of graphite oxide to obtain a suspension of graphite oxide, and place the suspension in Graphite oxide is mechanically exfoliated in a high-shear emulsifier. The emulsifier is stirred for 40 minutes at a speed of 10,000 rpm. While graphite oxide is exfoliated and cleaved, octadecylamine is grafted to the oxygen-containing groups of graphite oxide to form a graft Graphene oxide dispersion with octadecylamine;

[0033] 2) Low temperature reduction

[0034] First, the graphene oxide solution grafted with octadecylamine obtained in step 1) is suction-filtered, the suction-filtration time is determined according to the viscosity of the actual graphene oxide solution, gen...

Embodiment 2

[0037] A kind of preparation method of alkylation modified graphene, comprises the steps:

[0038] 1) Cleavage of graphite oxide while introducing alkyl chains

[0039]Dissolve 80g of SDBS, 20g of AFCONA5000, and 100g of octadecylamine in a mixed solvent of 9000g of ethanol+water (ethanol:water=2:1), then add 33g of graphite oxide to obtain a suspension of graphite oxide, and then place the suspension in Graphite oxide is mechanically exfoliated in a high-shear emulsifier. The emulsifier is stirred for 40 minutes at a speed of 10,000 rpm. While graphite oxide is exfoliated and cleaved, octadecylamine is grafted to the oxygen-containing groups of graphite oxide to form a graft Graphene oxide dispersion with octadecylamine;

[0040] 2) Low temperature reduction

[0041] First, the graphene oxide dispersion grafted with octadecylamine obtained in step 1) is suction-filtered to obtain a graphene oxide filter cake, and the suction filtration time is determined according to the vi...

Embodiment 3

[0044] A kind of preparation method of alkylation modified graphene, comprises the steps:

[0045] 1) Cleavage of graphite oxide while introducing alkyl chains

[0046] Dissolve SDS 150g, AFCONA5000 2g, and silane coupling agent KH560 100g in a mixed solvent of 10kg ethanol+water (ethanol:water=10:1), then add 142g of graphite oxide powder to obtain a suspension of graphite oxide, and then The suspension is placed in a high-shear emulsifier to mechanically peel off the graphite oxide. The emulsifier is stirred for 40 minutes at a speed of 10,000 rpm. While the graphite oxide is peeling and cleaved, the silane coupling agent is grafted to the oxygen-containing groups of the graphite oxide. , forming a graphene oxide dispersion grafted with silane chains;

[0047] 2) Low temperature reduction

[0048] First, suction filter the graphene oxide dispersion grafted with a silane coupling agent obtained in step 1) to obtain a graphene oxide filter cake. The suction filtration time d...

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Abstract

The invention discloses a preparation method of alkylated modified graphene. Graphite oxide is used as a raw material, in the process of preparation of graphene with a reduction method, graphene oxide obtained through cleavage is subjected to graft modification by the aid of a modifier containing an alkyl chain in a molecular chain and then is reduced, and alkylated modified graphene is obtained. According to the preparation method of alkylated modified graphene, graphite oxide is used as the raw material, the alkyl chain is grafted during peeling, and then an alkylated modified graphene product with the high grafting rate is obtained through reduction. For example, if octadecylamine is used as the modifier, the grafting rate is deduced according to the content of N, and the content of N can be up to 1.5wt%; if a silane coupling agent KH560 is used as the modifier, the grafting rate is deduced according to the content of Si, and the content of Si can be up to 2.9wt%; if a silane coupling agent KH560 is used as the modifier, the grafting rate is deduced according to the content of Si, and the content of Si can be up to 2.8wt%.

Description

technical field [0001] The invention relates to a method for carrying out alkylation modification on the basis of graphene prepared by a reduction method, and belongs to the field of graphene preparation. Background technique [0002] Graphene has a single layer of sp 2 The hexagonal lattice honeycomb two-dimensional structure composed of hybrid carbon atoms has excellent mechanical strength (strength: 130GPa, Young's modulus: 1TPa), and is widely used in the field of reinforcement and toughening of composite materials. In addition, graphene is known as the lightest material in the world, with a specific surface area as high as 2630m 2 / g, which meets the design requirements of lightweight composite materials. Due to the van der Waals force between graphene sheets, the sheets are easy to stack and difficult to disperse. The traditional melt blending method uses the direct feeding of graphene powder. Since the graphene is wrapped by the molten high-viscosity polymer, the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B2204/04C01B2204/20C01B2204/32
Inventor 孙丹萍丁怀东徐阳瞿研
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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