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Preparation method of graphene/polyolefin elastomer microspheres with near-zero dielectric constant

A polyolefin elastomer and dielectric constant technology, which is applied in the preparation of microspheres, microcapsule preparations, coatings, etc., can solve the problems of easy agglomeration of filling structures, difficulty in the same stacking form, and easy bending and folding of two-dimensional sheets. , to achieve the effect of efficient preparation method

Active Publication Date: 2022-04-05
TONGJI UNIV
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Problems solved by technology

[0004] In the above-mentioned patent, polydopamine is coated on the surface of two-dimensional graphene oxide grafted with antioxidants, and then the functionalized two-dimensional graphene oxide nanosheets are used as fillers and hot-pressed with polyolefin matrix. The quality of graphene and the matrix is ​​quite different, and the dispersion of the filler in the matrix is ​​difficult to ensure uniformity, while the functionalized two-dimensional sheet is easy to bend and fold, so the filling structure is easy to agglomerate, and the accumulation form is difficult to be the same

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  • Preparation method of graphene/polyolefin elastomer microspheres with near-zero dielectric constant

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preparation example Construction

[0022] A preparation method of graphene / polyolefin elastomer microspheres with near-zero dielectric constant, the specific steps are as follows:

[0023] (1) Preparation of dispersion A: Measure 10-150ml of concentrated sulfuric acid, 0.5-1.5g of graphite and 0.2-0.75g of sodium nitrate, place in an ice bath environment, stir magnetically until the dispersion is uniform, then slowly add 1.0-4.5g of high manganese Potassium acid. Then keep the mixture in a 25-55°C water bath with magnetic stirring, and at the same time slowly add 1.0-4.5g of potassium permanganate to control the reaction temperature at 25-35°C; pour the reaction mixture into a 20-200ml ice water In the beaker, add 30% hydrogen peroxide dropwise while stirring, filter while hot, wash with dilute hydrochloric acid solution and deionized water successively until neutral, centrifuge at 8000r / min for 10-50min, then ultrasonically disperse at a frequency of 10-70KHz 10-30min; Weigh 0.1-1g of the above solution, dry ...

Embodiment 1

[0029] This embodiment is a preparation method of graphene / polyolefin elastomer microspheres with a near-zero dielectric constant, which is carried out according to the following steps.

[0030](1) Preparation of dispersion A: Measure 138ml of concentrated sulfuric acid, 1.5g of graphite and 0.75g of sodium nitrate, place in an ice bath environment, magnetically stir until uniformly dispersed, then slowly add 4.5g of potassium permanganate. Then the mixture was kept under magnetic stirring in a 35°C water bath, and at the same time, 4.5g of potassium permanganate was slowly added to control the reaction temperature at 35°C; the reaction mixture was poured into a beaker with 200ml of ice water, and added dropwise 30% hydrogen peroxide, filtered while hot, washed with dilute hydrochloric acid solution and deionized water successively until neutral, centrifuged at 8000r / min for 10min, then ultrasonicated at 10KHz for 30min; weigh 0.2g of the above solution after drying and grindin...

Embodiment 2

[0035] This embodiment is a preparation method of graphene / polyolefin elastomer microspheres with a near-zero dielectric constant, which is carried out according to the following steps.

[0036] (1) Preparation of dispersion A: Measure 138ml of concentrated sulfuric acid, 1.5g of graphite and 0.75g of sodium nitrate, place in an ice bath environment, magnetically stir until uniformly dispersed, then slowly add 4.5g of potassium permanganate. Then the mixture was kept under magnetic stirring in a 35°C water bath, and at the same time, 4.5g of potassium permanganate was slowly added to control the reaction temperature at 35°C; the reaction mixture was poured into a beaker with 200ml of ice water, and added dropwise 30% hydrogen peroxide, filtered while hot, washed with dilute hydrochloric acid solution and deionized water successively until neutral, centrifuged at 8000r / min for 10min, then ultrasonicated at 20KHz for 30min; weigh 0.2g of the above solution after drying and grindi...

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Abstract

The invention relates to a method for preparing graphene / polyolefin elastomer microspheres with a near-zero dielectric constant. Concentrated sulfuric acid, graphite, and sodium nitrate are uniformly mixed at low temperature, then potassium permanganate is added, hydrogen peroxide is added dropwise, filtered, and washed to medium After dispersing, the obtained powder is added to water for secondary dispersion to obtain a dispersion liquid, which is added to an acidic solution and then heated to obtain a graphene foam, which is freeze-dried and ground into a graphene powder; toluene is added dropwise to the polyolefin elastomer particles Stir after swelling, add graphene powder and mix evenly, let stand and dry to obtain graphene / polyolefin elastomer microspheres. Compared with the prior art, the dielectric constant of the graphene / polyolefin elastomer microsphere composite material prepared by the present invention is close to zero in a specific frequency band, which broadens the research scope of the current metamaterial experience, which is special to the natural material system The dielectric constant can further promote the development of chemically controllable materials with electromagnetic properties.

Description

technical field [0001] The invention relates to a preparation method of a near-zero dielectric constant material, in particular to a preparation method of a graphene / polyolefin elastomer microsphere with a near-zero dielectric constant. Background technique [0002] Near-zero dielectric constant materials are a kind of artificial special electromagnetic materials that are currently researched more popularly. In 1998, Pendry et al. proposed that the use of periodically arranged wire arrays can achieve a lower equivalent plasma frequency. Based on this, in 2002, researchers from the Fresnel Institute in France selected to change the structure size and operating frequency. The copper sheet structure obtains an equivalent dielectric constant close to 0, so that the electromagnetic wave passes through this structure to generate beam convergence, and realizes high directivity of the dipole. But few researchers have investigated synthetic materials with near-zero dielectric consta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/06C08J7/06C08L23/00C08K7/24C08K3/04
CPCB01J13/06C08J7/06C08J2323/00C08K7/24C08K3/042
Inventor 邱军戴吉
Owner TONGJI UNIV