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A method and equipment for preparing polyvinyl alcohol/graphene conductive hybrid fibers based on wet-spinning magnetic field-induced migration technology

A polyvinyl alcohol and hybrid fiber technology, applied in the field of fiber materials, can solve the problems of loss of electrical conductivity, low concentration of addition, increase of modulus, etc., and achieve the effect of high electrical conductivity, easy operation, and simple method

Active Publication Date: 2020-01-14
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composite filled conductive fiber materials using graphene as conductive filler have been widely studied and reported, but the conductivity of the obtained conductive fibers is not high, and the existing bottleneck problems are mainly poor dispersion and low concentration.
Although it is reported in the literature that after chemical modification or in-situ polymerization, the addition solubility is slightly improved, but it is far lower than the addition amount of carbon black conductive composite materials (about 40%)
Moreover, the original SP of graphene after treatment 2 The hybrid structure is destroyed, and the electrical conductivity is greatly lost
After physical treatment (adding surfactants, etc.), although the amount added has also increased, the residual dispersion stabilizer affects the electrical conductivity of the matrix. At the same time, the method of increasing the amount added by purely physical methods makes the mechanical properties of the material brittle and the modulus is greatly increased. , affecting the performance of fiber materials

Method used

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  • A method and equipment for preparing polyvinyl alcohol/graphene conductive hybrid fibers based on wet-spinning magnetic field-induced migration technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] like figure 1 As shown, this embodiment provides a kind of equipment based on wet spinning magnetic field induced migration technology to prepare polyvinyl alcohol / graphene conductive hybrid fiber, comprising spinning liquid material tank 1 and metering pump 11, candle filter in turn through pipeline 12 connection, the candle filter 12 is connected with the capillary shear field offset channel 3 through the pipeline, the electromagnet 2 and the excitation coil 4 are arranged below the capillary shear field offset channel 3, and the coagulation bath 6 is connected with the capillary tube through the godet roller 5 The shear field offset channel 3 is connected to receive the fine flow in the capillary shear field offset channel 3, the coagulation bath 6 is equipped with a godet roller 5, and the coagulation bath 6 is connected to the winder 7 through the godet roller 5 .

Embodiment 2

[0025] (1) Dissolve 6g KH-550 in 200ml water, hydrolyze in 80℃ water bath for 2h, add 4g nano Fe 3 o 4 , continue to react for 2h, get nano-Fe 3 o 4 / KH-550 solution, then add 2 g of graphene powder, react at 80° C. for 2 h, and wash with deionized water and ethanol three times in sequence to obtain a magnetic nano-transfer unit.

[0026] (2) Dissolve 2.04g of the magnetic nano-transfer unit and 57g of polyvinyl alcohol PVA in step (1) in 300ml of water to obtain PVA / graphene-Fe in one pot 3 o 4 The spinning solution is put into the spinning solution material tank 1, and is transported to the capillary shear field offset channel 3 by the metering pump 11 and the candle filter 12, at N 2 Under the environment, the capillary shear magnetic field is offset, the capillary length-to-diameter ratio is 80, the capillary aperture is 0.2mm, and the magnetic field is an electric excitation field. The silk roll 5 is squeezed into the coagulation bath 6, coagulated, washed with water...

Embodiment 3

[0028] (1) Dissolve 2g KH-550 in 200ml water, hydrolyze in 80℃ water bath for 2h, add 2g nano Fe 3 o 4 , continue to react for 2h, get nano-Fe 3 o 4 / KH-550 solution, and then add 2 g of graphene powder, react at 90°C for 4 hours, and wash with deionized water and ethanol three times in sequence to obtain a magnetic nano-transfer unit.

[0029] (2) Dissolve 1.14g of the magnetic nano-transfer unit and 57g of polyvinyl alcohol PVA in step (1) in 300ml of water to obtain PVA / graphene-Fe in one pot 3 o 4 The spinning solution is put into the spinning solution material tank 1, and is transported to the capillary shear field offset channel 3 by the metering pump 11 and the candle filter 12, at N 2 Under the environment, the capillary shear magnetic field is offset, the capillary aspect ratio is 190, the capillary aperture is 0.8mm, the magnetic field is an electric excitation magnetic field, and the magnetic field strength is controlled by adjusting the current to 1T, and the i...

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Abstract

The invention relates to a method for preparing polyvinyl alcohol / graphene conductive hybrid fiber based on a wet spinning magnetic field induced migration technology. The method comprises the wet spinning technical processes of synthesis of silane coupling agent-modified nanometer Fe3O4, synthesis of magnetic nanometer migration unit, preparation of the polyvinyl alcohol / graphene conductive hybrid fiber by magnetic field induced migration. The method provided by the invention is simple, easy to operate, and the polyvinyl alcohol / graphene conductive hybrid fiber with low graphene content and high conductivity can be obtained through a method of inducing offset by a magnetic field in shear flow; the obtained polyvinyl alcohol / graphene conductive hybrid fiber overcomes the phenomenon that ahigh-concentration material is crisp, and has high conductivity; an effective method for preparing a high-conductivity hybrid fiber material is provided, wherein the concentration of graphene lamellais in radial gradient distribution, so that the performance of the material shows anisotropic properties, and has wide application in the aspects of sensing, intelligence and braking.

Description

technical field [0001] The invention belongs to the field of fiber materials, in particular to a method and equipment for preparing polyvinyl alcohol / graphene conductive hybrid fibers based on wet spinning magnetic field induced migration technology. Background technique [0002] With the development of society and the progress of science and technology, more and more electronic products appear in our daily life. While these high-tech electronic products bring convenience to human life, they also make the electromagnetic radiation in our living and working environments more and more serious. Seriously, it has had a serious impact on our physical health. In order to prevent the interference of static electricity and electromagnetic radiation, various electromagnetic shielding and antistatic materials have been developed since the middle of the 20th century, among which conductive fiber materials are considered to be one of the most promising materials in the field of electrom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/50D01F1/09D01D5/06
Inventor 朱美芳杨利军汤宇泽翁巍相恒学梁云霞
Owner DONGHUA UNIV
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