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Mechanical stripping method of functionalized boron nitride nanosheet

A technology of mechanical exfoliation and boron nitride, applied in the direction of chemical instruments and methods, nitrogen compounds, nanotechnology, etc., can solve the problems of pollution, waste of raw materials, low crystallinity of BNNSs, etc., and achieve energy saving, production cost reduction, crystallization The effect of high degree of degree and functionalization

Active Publication Date: 2020-09-29
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low crystallinity of prepared BNNSs, waste of raw materials and easy environmental pollution, the present invention provides an efficient, safe and green synthesis method of BNNSs with high crystallinity

Method used

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  • Mechanical stripping method of functionalized boron nitride nanosheet
  • Mechanical stripping method of functionalized boron nitride nanosheet
  • Mechanical stripping method of functionalized boron nitride nanosheet

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Step (1): 80 g of boric acid and 10 g of commercial hexagonal boron nitride block (Bulk h-BN) were uniformly ground, put into an autoclave, and treated at 220° C. for 12 hours to obtain a hard white solid A. After the sample A was repeatedly washed with deionized water to remove free boric acid, an intermediate product of BO-h-BN was obtained, which was used for performance testing of pretreated samples.

[0032] Step (2): Put the product A obtained in the step (1) into a ball mill jar, and process it for 6 hours at 580 rpm to obtain product B.

[0033] Step (3): The product B obtained in step (2) is washed with deionized water to remove free boric acid components in the liquid to obtain a high-concentration and stable BNNSs dispersion product; or the wet product obtained by centrifugal cleaning is extracted by freezing Dry to obtain the powder product of functionalized BNNSs.

[0034] Step (4): The supernatant obtained by centrifugal washing in step (3) is processed b...

Embodiment 2、3、4、5

[0038] Change the consumption of boric acid and commercial hexagonal boron nitride into 72g and 18g respectively in embodiment 1 step (1); 75g and 12.5g; 80g and 8g; :1; 6:1; 10:1; 12:1). Other operations are the same as in Example 1, and high crystallinity and functionalized BNNSs dispersion products or powder products can also be prepared. High-quality functionalized BNNSs products could also be prepared by further increasing the amount of boric acid added, but the relative yield decreased.

Embodiment 6、7、8、9、10、11、12、13、14、15

[0040] The autoclave treatment temperature in step (1) in Examples 1-5 was changed to 200° C. and 240° C. respectively. Other operations are the same as in Example 1, and high crystallinity and functionalized BNNSs dispersion products or powder products can also be prepared. The temperature above 200 ° C can realize boric acid dehydration and change into corrosive boron oxide. Purpose of etching and fixing commercial blocks of hexagonal boron nitride.

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Abstract

The invention relates to a mechanical stripping method of a functionalized boron nitride nanosheet. The method adopts boric acid and commercial bulk hexagonal boron nitride as raw materials, and comprises the following three steps: uniformly mixing boric acid and commercial hexagonal boron nitride in a mortar, and carrying out high-temperature pretreatment to make the commercial bulk hexagonal boron nitride eroded by dehydrated boric acid and fixed by boron oxide in order to obtain a uniformly reacted solid mixture; roughly grinding the solid mixture obtained after the reaction, putting the ground solid mixture into a ball milling tank, and carrying out mechanical ball milling treatment; and dissolving and dispersing white powder obtained after ball milling into deionized water, and carrying out repeated washing multiple times to ensure that free boric acid is completely washed away so as to obtain a functionalized boron nitride nanosheet dispersion liquid product; or drying a productobtained by centrifugal washing to obtain a functionalized boron nitride nanosheet powder product. The method is simple to operate, harsh experimental conditions are not needed, boric acid and deionized water can be recycled, and the obtained products are high in crystallinity and functionalization degree.

Description

technical field [0001] The invention relates to an efficient mechanical stripping method for preparing functionalized boron nitride nanosheets with abundant functional groups. Background technique [0002] As an important multifunctional two-dimensional material, boron nitride nanosheets (BNNSs) have very similar lattice constants to graphene, and the lattice difference between them is only 2%. In addition, BNNSs has mechanical properties, thermal conductivity, and high specific surface area comparable to graphene, and compared with graphene, BNNSs has higher thermal stability, stronger oxidation resistance, and better corrosion resistance. Excellent properties such as resistance and electrical insulation. Therefore, it has broad application prospects in the fields of ceramics, electronics, petroleum, nuclear industry, aerospace, machinery, polymers, metals, optical glass and cosmetics. Among them, BNNSs is added to the polymer matrix as an inorganic filler to prepare poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064B82Y40/00
CPCB82Y40/00C01B21/0648C01P2004/24C01P2004/62C01P2004/64C01P2006/22
Inventor 薛彦明杨靖文曹超超唐成春
Owner HEBEI UNIV OF TECH
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