Cellulose/layered boron nitride high-dielectric nano-composite film and preparation method thereof

A nano-composite and boron nitride technology, applied in the field of composite materials, can solve the problems of complex preparation process and poor dielectric properties of composite films, and achieve the effects of low pollution, good optical properties and reduced dielectric loss

Active Publication Date: 2018-10-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current application of biomaterials in dielectrics is complicated on the one hand, and the composite film prepared on the other hand has poor dielectric properties.

Method used

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  • Cellulose/layered boron nitride high-dielectric nano-composite film and preparation method thereof
  • Cellulose/layered boron nitride high-dielectric nano-composite film and preparation method thereof
  • Cellulose/layered boron nitride high-dielectric nano-composite film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Preparation of cellulose / layered boron nitride composite film, the steps are as follows:

[0046] 1) Strip boron nitride and prepare boron nitride dispersion: take 12g of urea, 7g of sodium hydroxide, and 81g of deionized water, add 0.44g of boron nitride, stir mechanically at room temperature for 3 hours, and then ultrasonically disperse in an ice-water bath 1h, the ultrasonic power is 119W (340W×35%), so that the boron nitride can be completely stripped and dispersed, and the boron nitride dispersion is obtained;

[0047] 2) Preparation of cellulose / boron nitride mixture: cool down the boron nitride dispersion to -12°C, add 4g of cellulose, stir rapidly at a speed of 1700rpm / min, and then centrifuge at a speed of 5000rpm / min to obtain cellulose / boron nitride mixture;

[0048] 3) Preparation of hydrogel: spread the obtained cellulose / boron nitride mixture on a glass plate to form a specific thickness, then soak in acetone for regeneration for 30 minutes to obtain a ce...

Embodiment 2

[0054] Preparation of cellulose / layered boron nitride composite film, the steps are as follows:

[0055] 1) Strip boron nitride and prepare boron nitride dispersion: mix 12g of urea, 7g of sodium hydroxide, and 81g of deionized water, add 0.45g of boron nitride, and ultrasonically disperse in an ice-water bath for 2 hours, with ultrasonic power of 119W (340W× 35%), so that the boron nitride can be completely stripped and dispersed to obtain a boron nitride dispersion;

[0056] 2) Preparation of cellulose / boron nitride mixture: cool down the boron nitride dispersion to -11°C, add 4g of cellulose, stir rapidly at a speed of 1700rpm / min, and then centrifuge at a speed of 5000rpm / min to obtain cellulose / boron nitride mixture;

[0057] 3) Preparation of hydrogel: spread the obtained cellulose / boron nitride mixture on a glass plate by simple casting method, and form a specific thickness by controlling the casting force and the distance from the glass plate, and then soak in Rege...

Embodiment 3

[0061] Preparation of cellulose / layered boron nitride composite film, the steps are as follows:

[0062] 1) Strip boron nitride and prepare boron nitride dispersion: take 12g of urea, 7g of sodium hydroxide, and 81g of deionized water, add 0.42g of boron nitride, and ultrasonically disperse in an ice-water bath for 1.5h. The ultrasonic power is 119W (340W ×35%), so that the boron nitride can be completely stripped and dispersed to obtain a boron nitride dispersion;

[0063] 2) Preparation of cellulose / boron nitride mixture: cool down the boron nitride dispersion to -12°C, add 4g of cellulose, stir rapidly at a speed of 1800rpm / min, and then centrifuge at a speed of 5000rpm / min to obtain cellulose / boron nitride mixture;

[0064] 3) Preparation of hydrogel: spread the obtained cellulose / boron nitride mixture on a glass plate by simple casting method, and form a specific thickness by controlling the casting force and the distance from the glass plate, and then soak in 5%H 2 ...

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Abstract

The invention relates to a cellulose/layered boron nitride high-dielectric nano-composite film and preparation method of the cellulose/layered boron nitride high-dielectric nano-composite film. The cellulose/layered boron nitride high-dielectric nano-composite film has an obvious layered structure and comprises cellulose and boron nitride nanosheet layers uniformly dispersed in the cellulose. Thepreparation comprises the following steps: 1) preparing a boron nitride peeling layer dispersion liquid; 2) preparing a cellulose/boron nitride composite liquid: cooling the boron nitride peeling layer dispersion liquid obtained in the step 1) to below 0 DEG C, adding the cellulose according to the mass ratio of the boron nitride and the cellulose of (5: 95) to (15: 85), rapidly stirring and dissolving, performing centrifugation to remove impurities, thereby obtaining the cellulose/boron nitride composite liquid; 3) carrying out film formation on the prepared cellulose/boron nitride compositeliquid prepared in the step 2) in a coagulation bath to obtain the cellulose/layered boron nitride high-dielectric nano-composite film. The composite material provided by the invention has the layeredstructure and very high dielectric properties and high thermal conductivity (the breakdown voltage reaches 300 to 450 MVm<-1>, and the energy storage density is as high as 4 Jcm<-3> about, the thermal conductivity is about 2Wm<-1>K<-1>), and the cellulose/layered boron nitride high-dielectric nano-composite film has broad application prospects in the field of photovoltaic energy storage materials.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a cellulose / layered boron nitride high dielectric nanocomposite film and a preparation method thereof. Background technique [0002] At present, BOPP film (biaxially oriented polypropylene film) is the most used commercially, and its energy storage density is about 2J / cm 3 , the energy storage density needs to be improved; the raw material cost of PVDF dielectric film prepared by laboratory research is too high, the preparation process is complicated, and it is not renewable and cannot be recycled. This is a relatively large waste of scarce resources. In line with sustainable development. [0003] In addition, the current white pollution such as plastics is becoming more and more serious, and it is also necessary to develop renewable materials to replace traditional petrochemical products. Therefore, biomass raw materials are becoming more and more impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08K9/04C08K7/00C08K3/38C08J5/18
CPCC08J5/18C08J2301/02C08K7/00C08K9/04C08K2003/385C08K2201/011
Inventor 杨全岭张铖钢劳家萍石竹群熊传溪
Owner WUHAN UNIV OF TECH
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