CN115787286A - Preparation method of conductive cotton fabric for electromagnetic shielding - Google Patents
Preparation method of conductive cotton fabric for electromagnetic shielding Download PDFInfo
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- CN115787286A CN115787286A CN202211423850.3A CN202211423850A CN115787286A CN 115787286 A CN115787286 A CN 115787286A CN 202211423850 A CN202211423850 A CN 202211423850A CN 115787286 A CN115787286 A CN 115787286A
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- cotton fabric
- electromagnetic shielding
- carbon nanotube
- preparing
- polydopamine
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 93
- 239000004744 fabric Substances 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 229920001690 polydopamine Polymers 0.000 claims abstract description 58
- 239000002109 single walled nanotube Substances 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims description 29
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 19
- QKNYBSVHEMOAJP-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydron;chloride Chemical compound Cl.OCC(N)(CO)CO QKNYBSVHEMOAJP-UHFFFAOYSA-N 0.000 claims description 16
- 239000007853 buffer solution Substances 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 238000002791 soaking Methods 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 13
- 229910021641 deionized water Inorganic materials 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- IZXGZAJMDLJLMF-UHFFFAOYSA-N methylaminomethanol Chemical compound CNCO IZXGZAJMDLJLMF-UHFFFAOYSA-N 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hcl hcl Chemical compound Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to the technical field of electromagnetic shielding, in particular to a preparation method of a conductive cotton fabric for electromagnetic shielding, which comprises the following steps: preparing polydopamine cotton fabric and single-walled carbon nanotube ink, and immersing the polydopamine cotton fabric into the single-walled carbon nanotube ink to obtain the conductive cotton fabric. The method adopted by the invention overcomes the problems of difficult processing, high cost and poor electromagnetic shielding effect in the preparation of the electromagnetic shielding material in the prior art, has the advantages of simple processing, high efficiency and low cost, and the obtained material has good electromagnetic shielding effect and good practicability.
Description
Technical Field
The invention relates to the technical field of electromagnetic shielding, in particular to a preparation method of a conductive cotton fabric for electromagnetic shielding.
Background
The electromagnetic shield is used for protecting the electronic equipment and the working space from being interfered by electromagnetic radiation emitted by other electronic equipment and communication instruments, and has important significance for normal work of precision electronic equipment and the working space. At present, the most common electromagnetic shielding method is to adopt permalloy to process into a suitable metal cover and obtain the electromagnetic shielding cover for electromagnetic shielding through high-temperature annealing treatment, and the problems of difficult processing and high cost exist. Compared with metal electromagnetic shielding, the electromagnetic shielding material based on the conductive fabric can cover and protect objects such as electric wires, electronic equipment and the like which are suitable for the shapes and the sizes of the objects, and the preparation method of the conductive fabric can refer to Chinese invention patent with the application number of CN202010483825.9 and the name of electromagnetic shielding and hydrophobic functional fabric with high absorption characteristics and the preparation method thereof. At present, conductive fabrics generally have the problems of complex processing and poor electromagnetic shielding effect.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the preparation method of the conductive cotton fabric for electromagnetic shielding is good in electromagnetic shielding effect and low in cost.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a conductive cotton fabric for electromagnetic shielding comprises the following steps: preparing polydopamine cotton fabric and single-walled carbon nanotube ink, and immersing the polydopamine cotton fabric into the single-walled carbon nanotube ink to obtain the conductive cotton fabric.
Further, the method specifically comprises the following steps of S1:
preparing a 1M Tris-HCl buffer solution, mixing the 1M Tris-HCl buffer solution and 3-hydroxytyrosamine hydrochloride to prepare a polydopamine solution, and coating the polydopamine solution on cotton fibers to obtain the polydopamine cotton fabric.
Further, the step S1 specifically includes a step S11:
preparing (hydroxymethyl) aminomethane and deionized water into a solution according to the proportion of 0.24-0.3g/mL, and adding hydrochloric acid with the same volume as the deionized water into the solution to obtain a 1M Tris-HCl buffer solution.
Further, the step S1 specifically includes a step S12:
mixing 3-hydroxytyrosamine hydrochloride and 1M Tris-HCl buffer solution according to the volume ratio of 1: 4-5 to obtain the polydopamine solution.
Further, the step S1 specifically includes the step S13:
and immersing the cotton fabric into the polydopamine solution at room temperature for 1-2 days to obtain the cotton fabric coated with the polydopamine solution.
Further, the step S1 specifically includes the step S14:
and rinsing the cotton fabric coated with the polydopamine solution in deionized water for 30-40 minutes, and drying for 1 day at room temperature to obtain the polydopamine cotton fabric.
Further, the method specifically comprises the step S2:
and (3) matching the single-walled carbon nanotube with N, N-dimethylformamide to obtain the single-walled carbon nanotube ink.
Further, the step S2 specifically includes:
the single-walled carbon nanotube and N, N-Dimethylformamide (DMF) are proportioned according to the proportion of 0.1 weight percent, and then the single-walled carbon nanotube is dispersed for 2 to 3 hours by a minitype ultrasonic homogenizer to obtain the single-walled carbon nanotube ink.
Further, the method specifically comprises the step S3:
and soaking the poly-dopamine cotton fabric and the single-walled carbon nanotube ink in a bath type ultrasonic instrument for a preset time, taking out the poly-dopamine cotton fabric, drying, and repeating the soaking and drying steps for a preset number of times to obtain the conductive cotton fabric.
Further, the step S3 specifically includes:
and (2) putting the single-wall carbon nanotube ink into a bath type ultrasonic instrument with the temperature set to be 15-20 ℃, then soaking the poly-dopamine cotton fabric into the single-wall carbon nanotube ink in the bath type ultrasonic instrument for 20-30 minutes, taking out the poly-dopamine cotton fabric for drying, and repeating the soaking and drying steps for three times to obtain the conductive cotton fabric.
The invention has the beneficial effects that: the method for preparing the conductive cotton fabric for electromagnetic shielding has the advantages that the poly-dopamine cotton fabric is immersed into the single-walled carbon nanotube ink to obtain the conductive cotton fabric, the electromagnetic shielding efficiency is measured to be about-30 dB, the electromagnetic shielding effect is improved, and the problems of difficult processing, high cost and poor electromagnetic shielding effect in the preparation of electromagnetic shielding materials in the prior art are solved.
Drawings
FIG. 1 is a schematic flow diagram of the preparation method of the conductive cotton fabric of the present invention.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The invention provides a preparation method of a conductive cotton fabric, which is used for electromagnetic shielding.
Referring to fig. 1, a method for preparing an electromagnetic shielding conductive cotton fabric includes the steps of: preparing polydopamine cotton fabric and single-walled carbon nanotube ink, and immersing the polydopamine cotton fabric into the single-walled carbon nanotube ink to obtain the conductive cotton fabric.
From the above description, the beneficial effects of the present invention are: the method for preparing the conductive cotton fabric for electromagnetic shielding has the advantages that the poly-dopamine cotton fabric is immersed into the single-walled carbon nanotube ink to obtain the conductive cotton fabric, the electromagnetic shielding efficiency is measured to be about-30 dB, the electromagnetic shielding effect is improved, and the problems of difficult processing, high cost and poor electromagnetic shielding effect in the preparation of electromagnetic shielding materials in the prior art are solved.
In an alternative embodiment, the method specifically includes step S1:
preparing a 1M Tris-HCl buffer solution, mixing the 1M Tris-HCl buffer solution and 3-hydroxytyrosamine hydrochloride to prepare a polydopamine solution, and coating the polydopamine solution on cotton fibers to obtain the polydopamine cotton fabric.
In an alternative embodiment, the step S1 specifically includes the step S11:
preparing (hydroxymethyl) aminomethane and deionized water into a solution according to the proportion of 0.24-0.3g/mL, and adding hydrochloric acid with the same volume as the deionized water into the solution to obtain a 1M Tris-HCl buffer solution.
In an alternative embodiment, the step S1 specifically includes a step S12:
mixing 3-hydroxytyrosamine hydrochloride and 1M Tris-HCl buffer solution according to the volume ratio of 1: 4-5 to obtain polydopamine solution.
In an alternative embodiment, the step S1 specifically includes the step S13:
and immersing the cotton fabric into the polydopamine solution at room temperature for 1-2 days to obtain the cotton fabric coated with the polydopamine solution.
In an alternative embodiment, the step S1 specifically includes a step S14:
and rinsing the cotton fabric coated with the polydopamine solution in deionized water for 30-40 minutes, and drying for 1 day at room temperature to obtain the polydopamine cotton fabric.
In an alternative embodiment, the method specifically includes step S2:
and (3) matching the single-walled carbon nanotube with N, N-dimethylformamide to obtain the single-walled carbon nanotube ink.
In an optional embodiment, the step S2 specifically includes:
the single-walled carbon nanotube and N, N-Dimethylformamide (DMF) are mixed according to the proportion of 0.1 weight percent, and then the single-walled carbon nanotube is dispersed for 2 to 3 hours by a miniature ultrasonic homogenizer to obtain the single-walled carbon nanotube ink.
In an alternative embodiment, the method specifically includes step S3:
and soaking the poly-dopamine cotton fabric and the single-walled carbon nanotube ink in a bath type ultrasonic instrument for a preset time, taking out the poly-dopamine cotton fabric, drying, and repeating the soaking and drying steps for a preset number of times to obtain the conductive cotton fabric.
In an optional embodiment, the step S3 specifically includes:
and (2) putting the single-wall carbon nanotube ink into a bath type ultrasonic instrument with the temperature set to be 15-20 ℃, then soaking the poly-dopamine cotton fabric into the single-wall carbon nanotube ink in the bath type ultrasonic instrument for 20-30 minutes, taking out the poly-dopamine cotton fabric for drying, and repeating the soaking and drying steps for three times to obtain the conductive cotton fabric.
Referring to fig. 1, a first embodiment of the present invention is:
a preparation method of a conductive cotton fabric for electromagnetic shielding comprises the following steps:
s1, preparing a Polydopamine (PDA) cotton fabric;
s2, preparing single-walled carbon nanotube (SWCNT) ink;
and S3, preparing the conductive cotton fabric.
The specific operation of step S1 is:
s101, preparing a 1M Tris-HCl buffer solution, wherein the specific method comprises the following steps: dissolving (hydroxymethyl) aminomethane (Tris) and deionized water into the deionized water according to the proportion of 0.24-0.3g/mL, and adding hydrochloric acid (HCl) with the same volume as the deionized water into the solution to prepare 1M Tris-HCl buffer solution;
the pH value of the prepared 1M Tris-HCl buffer solution is 8-8.5;
s102, preparing a Polydopamine (PDA) solution, wherein the specific method comprises the following steps: 3-hydroxytyrosamine hydrochloride and the 1M Tris-HCl buffer solution prepared in the step S101 are proportioned and mixed according to the volume ratio of 1:5-1:4 to prepare a PDA solution;
s103, coating the PDA solution prepared in the step S102 on the cotton fiber, wherein the specific method comprises the following steps: immersing the cotton fabric in the PDA solution for 1-2 days at room temperature to coat PDA on the surface; then, rinsing the cotton fabric coated with the PDA in deionized water for 30-40 minutes, and drying for 1 day at room temperature to obtain a PDA cotton fabric;
the thickness of the cotton fiber is 0.15-0.25mm, and the component is 100% cotton;
the specific operation of step S2 is: proportioning a single-walled carbon nanotube (SWCNT) and N, N-Dimethylformamide (DMF) according to 0.1wt%, putting the SWCNT into the DMF, and then dispersing the SWCNT for 2-3 hours by using a miniature ultrasonic homogenizer to obtain SWCNT ink;
the specific operation of step S3 is: putting the SWCNT ink obtained in the step S2 into a bath type ultrasonic instrument, setting the temperature to be 15-20 ℃, and then soaking the PDA cotton fabric obtained in the step S1 into the SWCNT ink in the bath type ultrasonic instrument for 20-30 minutes; taking out the PDA cotton fabric, drying for 10-20 minutes, putting into an oven, and drying at 160-180 ℃ for 20-30 minutes; repeating the soaking and drying processes for three times to obtain the conductive cotton fabric coated with the SWCNT;
PDA's function to let SWCNTs adhere more tightly to cotton fabric;
the conductivity of the prepared conductive cotton fabric is realized by SWCNT;
the prepared conductive cotton fabric has conductivity, so that the electromagnetic shielding function is realized.
According to the conductive cotton fabric prepared by the embodiment, the electromagnetic shielding efficiency of the obtained conductive cotton fabric is measured in two frequency ranges (4-6 GHz and 8-12 GHz) by using a waveguide and Vector Network Analyzer (VNA), the measured electromagnetic shielding efficiency is about-30 dB, the actual electromagnetic shielding requirement (the actual electromagnetic shielding requirement of electronic equipment is-20 dB) is met, and the superiority of the method provided by the invention is verified.
In conclusion, the invention provides a preparation method of a conductive cotton fabric for electromagnetic shielding, which is characterized in that the conductive cotton fabric is obtained by immersing poly dopamine cotton fabric into single-walled carbon nanotube ink, the electromagnetic shielding efficiency is measured to be about-30 dB, the electromagnetic shielding effect is improved, and the problems of difficult processing, high cost and poor electromagnetic shielding effect in the preparation of electromagnetic shielding materials in the prior art are solved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A preparation method of a conductive cotton fabric for electromagnetic shielding is characterized by comprising the following steps: preparing polydopamine cotton fabric and single-walled carbon nanotube ink, and immersing the polydopamine cotton fabric into the single-walled carbon nanotube ink to obtain the conductive cotton fabric.
2. The method for preparing a conductive cotton fabric for electromagnetic shielding according to claim 1, which specifically comprises the steps of S1:
preparing a 1M Tris-HCl buffer solution, mixing the 1M Tris-HCl buffer solution and 3-hydroxytyrosamine hydrochloride to prepare a polydopamine solution, and coating the polydopamine solution on cotton fibers to obtain the polydopamine cotton fabric.
3. The method for preparing a conductive cotton fabric for electromagnetic shielding according to claim 2, wherein the step S1 specifically comprises the step S11:
the (hydroxymethyl) aminomethane and deionized water are used as a solution according to the proportion of 0.24-0.3g/mL, and hydrochloric acid with the same volume as the deionized water is added into the solution to obtain 1M Tris-HCl buffer solution.
4. The method for preparing a conductive cotton fabric for electromagnetic shielding according to claim 3, wherein the step S1 specifically comprises the step S12:
mixing 3-hydroxytyrosamine hydrochloride and 1M Tris-HCl buffer solution according to the volume ratio of 1: 4-5 to obtain polydopamine solution.
5. The method for preparing the conductive cotton fabric for electromagnetic shielding according to claim 4, wherein the step S1 specifically comprises the step S13:
and immersing the cotton fabric into the polydopamine solution at room temperature for 1-2 days to obtain the cotton fabric coated with the polydopamine solution.
6. The method for preparing a conductive cotton fabric for electromagnetic shielding according to claim 5, wherein the step S1 specifically comprises the step S14:
and rinsing the cotton fabric coated with the polydopamine solution in deionized water for 30-40 minutes, and drying for 1 day at room temperature to obtain the polydopamine cotton fabric.
7. The method for preparing a conductive cotton fabric for electromagnetic shielding according to claim 1, which specifically comprises the step S2:
and (3) matching the single-walled carbon nanotube with N, N-dimethylformamide to obtain the single-walled carbon nanotube ink.
8. The method for preparing a conductive cotton fabric for electromagnetic shielding according to claim 7, wherein the step S2 is specifically:
the single-walled carbon nanotube and N, N-Dimethylformamide (DMF) are proportioned according to the proportion of 0.1 weight percent, and then the single-walled carbon nanotube is dispersed for 2 to 3 hours by a minitype ultrasonic homogenizer to obtain the single-walled carbon nanotube ink.
9. The method for preparing a conductive cotton fabric for electromagnetic shielding according to claim 1, which specifically comprises the step S3:
and soaking the poly-dopamine cotton fabric and the single-walled carbon nanotube ink in a bath type ultrasonic instrument for a preset time, taking out the poly-dopamine cotton fabric, drying, and repeating the soaking and drying steps for a preset number of times to obtain the conductive cotton fabric.
10. The method for preparing a conductive cotton fabric for electromagnetic shielding according to claim 9, wherein the step S3 specifically comprises:
and (2) putting the single-wall carbon nanotube ink into a bath type ultrasonic instrument with the temperature set to be 15-20 ℃, then soaking the poly-dopamine cotton fabric into the single-wall carbon nanotube ink in the bath type ultrasonic instrument for 20-30 minutes, taking out the poly-dopamine cotton fabric for drying, and repeating the soaking and drying steps for three times to obtain the conductive cotton fabric.
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| CN202211423850.3A CN115787286A (en) | 2022-11-14 | 2022-11-14 | Preparation method of conductive cotton fabric for electromagnetic shielding |
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