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Support layer, preparation method thereof, composite membrane and application thereof

A technology of supporting layer and casting liquid, applied in the field of composite membrane, supporting layer and its preparation, can solve the problems of poor composite ability of supporting layer and thin film, poor permeability of supporting layer, complicated transfer process, etc., achieving controllable thickness and cost. Low, simple process effect

Active Publication Date: 2020-12-04
BEIJING GRAPHENE INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] A main purpose of the present invention is to overcome at least one defect of the above-mentioned prior art, to provide a support layer and its preparation method, as well as the application of the composite film and the application of the composite film to solve the problem of existing two-dimensional materials. The transfer process of the film is complex and the yield is poor, it cannot be self-supporting, the composite ability of the support layer and the film is poor, and the permeability of the support layer is poor

Method used

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  • Support layer, preparation method thereof, composite membrane and application thereof
  • Support layer, preparation method thereof, composite membrane and application thereof
  • Support layer, preparation method thereof, composite membrane and application thereof

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preparation example Construction

[0046] figure 1 Show the preparation process flowchart of the support layer of an embodiment of the present invention; figure 1 As shown, the preparation method of the support layer includes: dissolving the polymer in a solvent to obtain a casting solution; coating the casting solution on the surface of a two-dimensional material film to obtain a pretreatment structure; and curing the pretreatment structure , forming a support layer on the surface of the two-dimensional material thin film.

[0047] According to the present invention, the transfer and support technology of the two-dimensional material film has always restricted its development and application. Taking single-layer or few-layer graphene as an example, traditional methods generally use mechanical pressing and polymethyl methacrylate (PMMA) to transfer it to the support layer. The transfer process is complicated and the resulting separation membrane has many impurities, many defects, The composite ability of the ...

Embodiment 1

[0069]1) The copper foil was electrochemically polished for 20 minutes, and after polishing, the copper foil was cleaned with deionized water and ethanol, and finally dried with nitrogen gas. The polished copper foil was placed in a CVD tube furnace, evacuated to a vacuum, 400 sccm of hydrogen was introduced and the temperature was raised, and the temperature was raised to 1025° C. in 1.5 hours, and kept for 1 hour for annealing. Pass into 4sccm methane then, keep 2 hours and carry out graphene growth. After the growth, the tube furnace was moved out of the high-temperature zone to cool down quickly, and the flow rate of hydrogen and methane was kept constant. After the tube furnace was cooled to room temperature, the graphene was taken out.

[0070] 2) After drying 8g of PVDF with a weight average molecular weight of 534,000, it was dissolved in 32g of N,N-dimethylacetamide at 80°C to form a uniform casting solution. After the casting solution is degassed, the casting solut...

Embodiment 2

[0077] 1) The copper foil was electrochemically polished for 20 minutes, and after polishing, the copper foil was cleaned with deionized water and ethanol, and finally dried with nitrogen gas. The polished copper foil was placed in a CVD tube furnace, evacuated to a vacuum, 400 sccm of hydrogen was introduced and the temperature was raised, and the temperature was raised to 1025° C. in 1.5 hours, and kept for 1 hour for annealing. Pass into 4sccm methane then, keep 2 hours and carry out graphene growth. After the growth, the tube furnace was moved out of the high-temperature zone to cool down quickly, and the flow rate of hydrogen and methane was kept constant. After the tube furnace was cooled to room temperature, the graphene was taken out.

[0078] 2) After drying 8g of PVDF with a weight average molecular weight of 534,000, it was dissolved in 32g of N,N-dimethylacetamide at 80°C to form a uniform casting solution. After the casting solution is degassed, the casting solu...

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Abstract

The invention provides a support layer, a preparation method thereof, a composite membrane applying the support layer and application of the composite membrane. The preparation method of the support layer comprises the steps of dissolving a polymer in a solvent to obtain a membrane casting solution; coating the surface of a two-dimensional material film with the membrane casting solution to obtaina pretreated structure; and carrying out curing treatment on the pretreated structure to form a support layer on the surface of the two-dimensional material film. According to the method, the poroussupport layer is directly formed on the two-dimensional material film by utilizing a phase inversion method, so that the problems of a two-dimensional material film transfer and support technology canbe effectively solved. The obtained composite membrane is thin in support layer and controllable in thickness, is of a high-porosity porous structure, has very good permeability, is high in mechanical strength and stable in chemical property, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a support layer and its preparation method, a composite membrane and its application. Background technique [0002] With the increasing demand for separation products and processes in medical, electronics, environmental protection, chemical and other industries, membrane separation technology has attracted much attention as an energy-saving and environmentally friendly membrane separation technology. The selectivity and permeability of traditional separation membranes are mutually restricted, the durability of engineering applications is poor, and the import of raw materials is controlled, which limits the application of membrane separation technology in high-end fields. Two-dimensional material film, because of its ultra-thin and potential to prepare controllable nanoporous graphene film, provides a new solution to break through the technical barriers of membrane se...

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D69/12
CPCB01D69/10B01D69/105B01D69/12
Inventor 王路达张东旭侯丹丹张盛萍姚阿艳孙佳月王文轩
Owner BEIJING GRAPHENE INST
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