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Aliphatic chain grafted hexagonal boron nitride nanocomposite material and preparation method thereof

A nanocomposite material, hexagonal boron nitride technology, applied in chemical instruments and methods, preparation of organic compounds, nanotechnology for materials and surface science, etc., can solve harsh modification conditions, low grafting rate, dispersion The problem of not improving the performance is not very good, to achieve the effect of improving the interaction force and improving the dispersibility

Inactive Publication Date: 2018-03-23
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have achieved the improvement of its different functions by grafting the surface of hexagonal boron nitride to varying degrees, the grafting rate is low (less than 10%), the modification conditions are harsh, and high temperature and pressure are required. And the reaction cycle is long, it needs 48h, and other shortcomings make it limited in further application, especially when it is compounded with polymers, its dispersibility is not improved very well, and the improvement in the improvement of neutron absorption performance is not obvious

Method used

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  • Aliphatic chain grafted hexagonal boron nitride nanocomposite material and preparation method thereof
  • Aliphatic chain grafted hexagonal boron nitride nanocomposite material and preparation method thereof
  • Aliphatic chain grafted hexagonal boron nitride nanocomposite material and preparation method thereof

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Effect test

Embodiment 1

[0073] (1) Weigh 2.8g of sodium hydroxide and 2.2g of potassium hydroxide, add 1g of hexagonal boron nitride nanosheets, grind them into fine powder in a mortar, and mix well. The mixed powder was reacted in a crucible at 180° C. for 3 h, and cooled to room temperature. The mixed powder treated by the solid phase method was dispersed in a certain amount of water, the mixed solution was treated with an ultrasonic cell pulverizer for 2 hours, and then the supernatant was removed by centrifugation. Washing with distilled water 3 times until the pH of the solution is neutral to obtain pre-hydroxylated hexagonal boron nitride.

[0074] (2) In an ice bath, dissolve 5.4 g of p-phenylenediamine in 4 mL of 98% concentrated sulfuric acid and 32 mL of deionized water, and stir until the p-phenylenediamine is completely dissolved. Add 30% sodium nitrite solution dropwise from the liquid surface to the above solution to prepare the corresponding sulfated diazonium salt solution.

[0075]...

Embodiment 2

[0078] (1) Weigh 2.8g of sodium hydroxide and 2.2g of potassium hydroxide, add 1g of hexagonal boron nitride nanosheets, grind them into fine powder in a mortar, and mix well. Transfer the mixed powder into a 100mL hydrothermal reaction kettle, add 70mL of pure water, react at 180°C for 6h, cool to room temperature, use an ultrasonic cell pulverizer to treat the mixture for 2h, and then centrifuge to remove the supernatant, the lower layer Washing with distilled water for 3 times until the pH of the solution is neutral to obtain pre-hydroxylated hexagonal boron nitride.

[0079] (2) In an ice bath, dissolve 5.4 g of p-phenylenediamine in 4 mL of 98% concentrated sulfuric acid and 32 mL of deionized water, and stir until the p-phenylenediamine is completely dissolved. Add 30% sodium nitrite solution dropwise from the liquid surface to the above solution to prepare the corresponding sulfated diazonium salt solution.

[0080] (3) Disperse the pre-hydroxylated hexagonal boron nit...

Embodiment 3

[0083] (1) Weigh 2.8g of sodium hydroxide and 2.2g of potassium hydroxide, add 1g of hexagonal boron nitride nanosheets, grind them into fine powder in a mortar, and mix well. First react the mixed powder in a crucible at 180°C for 3h, then transfer the mixed powder into a 100mL hydrothermal reaction kettle, add 70mL of pure water, and react at 180°C for 6h. After cooling to room temperature, the mixture was treated with an ultrasonic cell disruptor for 2 hours, and then the supernatant was removed by centrifugation, and the lower layer was washed with distilled water three times until the pH of the solution was neutral to obtain pre-hydroxylated hexagonal boron nitride.

[0084] (2) In an ice bath, dissolve 5.4 g of p-phenylenediamine in 4 mL of 98% concentrated sulfuric acid and 32 mL of deionized water, and stir until the p-phenylenediamine is completely dissolved. Add 30% sodium nitrite solution dropwise from the liquid surface to the above solution to prepare the correspo...

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Abstract

The invention discloses an aliphatic chain grafted hexagonal boron nitride nanocomposite material and a preparation method thereof. According to the preparation process, a hexagonal boron nitride nanomaterial is subjected to pre-hydroxylation treatment, then an acid solution is added, the mixed solution reacts with a substituted phenylamino acidized diazonium salt, aniline modified hexagonal boronnitride is obtained, and finally, aniline modified hexagonal boron nitride is dispersed in an organic solvent under the action of an acid-binding agent for further reaction with acyl chloride. A nanocomposite material can be prepared from different parts by mass of aliphatic chain grafted nanocomposite materials prepared with the method as well as high-density polyethylene with a blending and forming technology. With adoption of the mild and efficient diazonium salt high-temperature reaction method for surface modification of hexagonal boron nitride, the defects of strict reaction condition,long reaction period, low grafting rate and the like of the traditional method are overcome. Therefore, the prepared aliphatic chain grafted hexagonal boron nitride nanocomposite material containing short-branched-chain aliphatic chains has good dispersity in high-density polyethylene.

Description

technical field [0001] The present invention involves a new type of fat -nitride composite material and its preparation methods. Background technique [0002] With the progress of nuclear energy development, traditional radiation protection materials can no longer meet the protection requirements of my country's nuclear power industry, such as the traditional radiation protection material - lead, which is highly toxic and has poor neutron shielding effect. Lead-containing concrete Disadvantages such as large and difficult to move. Therefore, in order to meet the resulting challenges, it has become an important aspect of material research and development to develop new radiation-proof materials that are non-toxic, low-density, good shielding effect, and excellent physical properties. At present, there are many types of absorbers used in neutron absorption materials. Among them, the hexagonal boron nitride is 10 B isotope has good neutron absorption ability, and nano-scale he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/07C07C231/02C07C209/68C07C211/46C07C245/20B82Y30/00G21F1/10
Inventor 王竹君郑水蓉李化毅
Owner NORTHWESTERN POLYTECHNICAL UNIV
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