CN114960210B - Flame-retardant conductive cotton fabric and preparation method and application thereof - Google Patents
Flame-retardant conductive cotton fabric and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a flame-retardant conductive cotton fabric and a preparation method and application thereof. The preparation method of the flame-retardant conductive cotton fabric comprises the following steps: the preparation method comprises the steps of sequentially dipping a cotton fabric by using a branched polyethyleneimine modified halloysite powder aqueous solution, a phytic acid aqueous solution and a graphene oxide aqueous solution, washing and drying the dipped cotton fabric, circularly carrying out dipping treatment, washing and drying for multiple times, and carrying out thermal reduction on the cotton fabric to obtain the flame-retardant conductive cotton fabric. The flame-retardant conductive cotton fabric has excellent flame-retardant performance and excellent conductive performance, is simple to prepare, high-efficiency and low in cost, can effectively avoid or inhibit fire accidents caused by short circuit, overload, overheating and the like when being used for the piezoresistive pressure sensor, has good pressure circulation stability, can be used for detecting various human body movements, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of flame-retardant conductive materials, in particular to a flame-retardant conductive cotton fabric and a preparation method and application thereof.
Background
In recent years, with the development of wearable devices, wearable sensors for detecting human body motion have attracted extensive attention in academia and industry. Most of the existing wearable sensors adopt flexible polymer materials as flexible substrates, and although the requirements of flexible wearable sensors can be met, the flexible polymer materials are poor in air permeability and not beneficial to skin breathing. The cotton fabric has the excellent characteristics of light weight, environmental protection, flexibility, low price, easy acquisition, easy processing and the like, and is considered as an ideal base material of wearable electronic products. However, the limit oxygen index of cotton fabric is only 18%, the cotton fabric is very easy to ignite in the daily use process to cause fire, and when the cotton fabric is used as a flexible substrate of a wearable sensor, fire accidents can be caused when the sensor is subjected to short circuit, overload, overheating and the like, and the safety of lives and properties of people is greatly threatened.
Therefore, the development of the flame-retardant conductive cotton fabric with excellent flame-retardant performance and excellent conductive performance has very important significance.
Disclosure of Invention
The invention aims to provide a flame-retardant conductive cotton fabric and a preparation method and application thereof.
The technical scheme adopted by the invention is as follows:
the preparation method of the flame-retardant conductive cotton fabric comprises the following steps: the preparation method comprises the steps of sequentially dipping a cotton fabric with a branched polyethyleneimine modified halloysite powder aqueous solution, a phytic acid aqueous solution and a graphene oxide aqueous solution, washing and drying the dipped cotton fabric, circularly carrying out dipping treatment, washing (removing substances which are not firmly attached) and drying for multiple times, and carrying out thermal reduction (converting graphene oxide into reduced graphene oxide) on the cotton fabric to obtain the flame-retardant conductive cotton fabric.
Preferably, the cotton fabric is subjected to an oxygen plasma treatment prior to use.
Preferably, the time of the oxygen plasma treatment is 2min to 10min.
Preferably, the branched polyethyleneimine modified halloysite aqueous solution is prepared by the following method: adding water into halloysite powder and branched polyethyleneimine for ultrasonic dispersion to obtain a branched polyethyleneimine modified halloysite powder aqueous solution.
Preferably, the weight ratio of the halloysite powder to the branched polyethyleneimine is 1-10.
Preferably, the phytic acid in the phytic acid aqueous solution accounts for 3-5% by mass.
Preferably, the concentration of the graphene oxide in the graphene oxide aqueous solution is 1 mg/mL-5 mg/mL.
Preferably, the drying is carried out at 50-80 ℃ for 0.5-1.5 h.
Preferably, the number of cycles is 2 to 8.
Preferably, the thermal reduction is carried out at 160-180 ℃, and the thermal reduction time is 2-4 h.
A flame-retardant conductive cotton fabric is prepared by the preparation method.
A piezoresistive pressure sensor comprises the flame-retardant conductive cotton fabric.
A piezoresistive pressure sensor for detecting human body movement comprises the flame-retardant conductive cotton fabric.
Preferably, the body motion is at least one of pulse, finger bending, wrist bending, elbow bending, knee bending, swallowing, speaking, walking, running.
The invention has the beneficial effects that: the flame-retardant conductive cotton fabric has excellent flame-retardant performance and excellent conductive performance, is simple to prepare, high-efficiency and low in cost, can effectively avoid or inhibit fire accidents caused by short circuit, overload, overheating and the like when being used for the piezoresistive pressure sensor, has good pressure circulation stability, can be used for detecting various human body movements, and has wide application prospect.
Specifically, the method comprises the following steps:
1) The flame-retardant conductive cotton fabric has excellent flame-retardant property and excellent conductive property, is simple to prepare, high-efficiency and low in cost, can effectively avoid or inhibit fire accidents caused by short circuit, overload, overheating and the like when being used for the piezoresistive pressure sensor, increases the use safety, has the advantages of strong repeatability, high response speed, good cycle stability and the like, and can be applied to the field of human body motion detection;
2) The flame-retardant conductive cotton fabric is prepared by a layer-by-layer assembly method, and the preparation process has the advantages of simplicity, high efficiency, environmental protection, low cost, easiness in production and the like, and is suitable for large-scale industrial production.
Drawings
Fig. 1 is an SEM image of the flame retardant conductive cotton fabric of example 1.
FIG. 2 is a micro calorimetry test result chart for the pretreated cotton fabric and the flame-retardant conductive cotton fabric of example 1.
Fig. 3 is a real-time resistance change curve of the piezoresistive pressure sensor of example 1 for 3000 load-unload cycles.
Fig. 4 is a real-time resistance variation curve of the piezoresistive pressure sensor in example 1 for testing the pulse beat behavior of a human body.
Fig. 5 is a real-time resistance change curve of the piezoresistive pressure sensor of example 1 for testing the bending behavior of a human finger.
Fig. 6 is a real-time resistance variation curve of the piezoresistive pressure sensor of example 1 for testing the bending behavior of the wrist of a human body.
Fig. 7 is a real-time resistance change curve of the piezoresistive pressure sensor according to the embodiment 1 for testing the bending behavior of the human elbow.
Fig. 8 is a real-time resistance change curve of the piezoresistive pressure sensor of example 1 for testing the bending behavior of the knee of a human body.
Fig. 9 is a graph showing the real-time resistance change of the piezoresistive pressure sensor according to example 1 in the measurement of swallowing in a human body.
Fig. 10 is a real-time resistance change curve of the piezoresistive pressure sensor of embodiment 1 for testing the facial movements of a human body.
Fig. 11 is a real-time resistance change curve of the piezoresistive pressure sensor for testing the walking action of the human body in embodiment 1.
Fig. 12 is a real-time resistance variation curve of the piezoresistive pressure sensor testing the running motion of the human body in the embodiment 1.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
a flame-retardant conductive cotton fabric and a preparation method thereof comprise the following steps:
1) Cotton fabric (size specification of 9cm multiplied by 30cm, surface density of 127 g/m) 2 ) With plasma of power 160WTreating with oxygen plasma at 0.2mbar for 5min to obtain pretreated cotton fabric (VT-R3, sun June, china);
2) Adding 2g of halloysite powder and 0.4g of branched polyethyleneimine into 397.6g of deionized water, and carrying out ultrasonic treatment (ultrasonic power is 0.3 kW) for 30min to obtain a branched polyethyleneimine modified halloysite powder aqueous solution;
3) Sequentially dipping the pretreated cotton fabric in the step 1) by using the branched polyethyleneimine modified halloysite powder aqueous solution, a phytic acid aqueous solution with the mass fraction of 5% and a graphene oxide aqueous solution with the concentration of 3mg/mL in the step 2), soaking the dipped cotton fabric for 1min by using deionized water, putting the cotton fabric into an oven, drying for 0.5h at 80 ℃, circularly performing dipping treatment, washing and drying for 6 times, putting the cotton fabric into the oven, and drying for 4h at 160 ℃ to obtain the flame-retardant conductive cotton fabric.
A piezoresistive pressure sensor is made of the flame-retardant conductive cotton fabric of the embodiment, and electrodes are attached to two ends of the flame-retardant conductive cotton fabric.
And (3) performance testing:
1) The flame-retardant conductive cotton fabric prepared in this example was fixed on a sample stage with a conductive adhesive for metal spraying, and then subjected to microscopic morphology testing (magnification of 200 times) with an EVO 18 scanning electron microscope of Carl Zeiss Jena, germany, to obtain a Scanning Electron Microscope (SEM) image as shown in fig. 1.
As can be seen from fig. 1: each bundle of fibers on the surface of the flame-retardant conductive cotton fabric is firmly covered by the halloysite and the reduced graphene oxide layer, so that a continuous and compact physical covering layer is formed.
2) The micro calorimetric tests of the pretreated cotton fabric (unmodified) and the flame-retardant conductive cotton fabric in this example were carried out, and the test results are shown in fig. 2.
As can be seen from fig. 2: compared with a pretreated cotton fabric (unmodified), the Total Heat Release (THR) of the flame-retardant conductive cotton fabric is sharply reduced from 12.5kJ/g to 2.3kJ/g, and the Peak Heat Release Rate (PHRR) is sharply reduced from 260.8W/g to 59.1W/g, so that the use safety of the cotton fabric is greatly improved in the modification process (the damage to people wearing the modified cotton product can be reduced due to lower heat release in the combustion process, and substances below the cotton fabric can be protected from the influence of heat).
3) Human motion detection:
a) 3000 times of loading-unloading cycles are carried out on the piezoresistive pressure sensor prepared in the embodiment by using an ESM303 (Mark-10, USA) universal testing machine, resistance change of the piezoresistive pressure sensor in the stretching process is recorded in real time by using a DMM6500 universal meter (Keithley, USA), and an obtained real-time resistance change curve is shown in FIG. 3;
b) The piezoresistive pressure sensor prepared in the embodiment is fixed at the wrist pulse part of a tester by using the medical adhesive tape, the resistance change of the pulse beating behavior of a human body is tested, and the obtained real-time resistance change curve is shown in fig. 4;
c) The piezoresistive pressure sensor prepared in the embodiment is fixed at the second joint of the index finger of a tester by using the medical adhesive tape, the tester repeatedly bends the finger to 90 degrees, the resistance change of the bending behavior of the finger of a human body is tested, and the obtained real-time resistance change curve is shown in fig. 5;
d) The piezoresistive pressure sensor prepared in this embodiment is fixed at the wrist joint of a tester by using a medical adhesive tape, the tester repeatedly bends the wrist to test the resistance change of the bending behavior of the wrist of the human body, and the obtained real-time resistance change curve is shown in fig. 6;
e) The piezoresistive pressure sensor prepared in this embodiment is fixed to the elbow joint of a tester with a medical adhesive tape, the tester repeatedly bends the elbow and tests the resistance change of the bending behavior of the human elbow, and the obtained real-time resistance change curve is shown in fig. 7;
f) The piezoresistive pressure sensor prepared in this embodiment is fixed at the knee joint of a tester by using a medical adhesive tape, the tester repeatedly bends the knee, and the resistance change of the bending behavior of the knee of the human body is tested, so that the obtained real-time resistance change curve is shown in fig. 8;
g) The piezoresistive pressure sensor prepared in the embodiment is fixed at the throat of a tester by using a medical adhesive tape, the tester finishes swallowing repeatedly, the resistance change of the swallowing behavior of a human body is tested, and the obtained real-time resistance change curve is shown in fig. 9;
h) The piezoresistive Pressure sensor prepared in this embodiment is fixed on the face of a tester by a medical adhesive tape, the tester repeatedly speaks the word "Pressure" to test the resistance change of the human facial behavior, and the obtained real-time resistance change curve is shown in fig. 10;
i) The piezoresistive pressure sensor prepared in this embodiment is fixed to the bottom of the heel of the insole of a tester by using a medical adhesive tape, and the resistance change of a human body when walking is tested, so that the obtained real-time resistance change curve is shown in fig. 11;
j) The piezoresistive pressure sensor prepared in this example was fixed to the bottom of the heel of the insole of a human subject with a medical tape, and the resistance change of the human subject during running was measured, and the obtained real-time resistance change curve is shown in fig. 12.
As can be seen from fig. 3 to 12: the piezoresistive pressure sensor of the embodiment has excellent cycling stability, has good responsiveness and repeatability to actions of different parts of a human body, and shows that the piezoresistive pressure sensor can be applied to human body movement detection.
4) The flame-retardant conductive cotton fabric prepared in this example was subjected to a vertical burning test, and the test results are shown in table 1:
as can be seen from Table 1: the flame-retardant conductive cotton fabric can realize self-extinguishing after being exposed in flame for only 3 seconds, has no obvious smoldering phenomenon, has the carbon residue length of only 3.8cm, and shows excellent actual flame-retardant effect.
5) The flame-retardant conductive cotton fabric prepared in this example was subjected to limiting oxygen index and thermogravimetric tests, and the test results are shown in table 2:
as can be seen from Table 2: the flame-retardant conductive cotton fabric has the advantages that the limiting oxygen index is 32.1%, the maximum weight loss rate is 1.0%/° c, the carbon residue rate is 45.3%, and the flame-retardant conductive cotton fabric has excellent flame retardant performance.
In conclusion, the flame-retardant conductive cotton fabric prepared by the embodiment has excellent flame-retardant performance, and the piezoresistive pressure sensor prepared by the flame-retardant conductive cotton fabric has good pressure cycle stability, shows stable and repeatable electrical response signals, can be successfully applied to detection of various human movements, and has huge application prospects in the field of intelligent wearing.
Example 2:
a flame-retardant conductive cotton fabric is prepared by the following steps:
1) Cotton fabric (size specification of 9cm multiplied by 30cm, surface density of 127 g/m) 2 ) Treating with 160W plasma machine (VT-R3, sun June, china) at 0.2mbar with oxygen plasma for 2min to obtain pretreated cotton fabric;
2) Adding 1g of halloysite powder and 1g of branched polyethyleneimine into 398g of deionized water, and carrying out ultrasonic treatment (ultrasonic power is 0.3 kW) for 30min to obtain a branched polyethyleneimine modified halloysite powder aqueous solution;
3) Sequentially dipping the pretreated cotton fabric in the step 1) by using the branched polyethyleneimine modified halloysite powder aqueous solution, a phytic acid aqueous solution with the mass fraction of 5% and a graphene oxide aqueous solution with the concentration of 1mg/mL in the step 2), soaking the dipped cotton fabric for 1min by using deionized water, putting the cotton fabric into an oven, drying for 1.5h at 50 ℃, circularly performing dipping treatment, washing and drying for 8 times, putting the cotton fabric into the oven, and drying for 4h at 160 ℃ to obtain the flame-retardant conductive cotton fabric.
A piezoresistive pressure sensor is made of a flame-retardant conductive cotton fabric with electrodes attached to two ends.
And (3) performance testing:
1) Human motion detection (test method as in example 1): the response curves of the piezoresistive pressure sensor prepared in the embodiment for different human body movements are similar to those of fig. 3 to 12, which shows that the sensor has good pressure cycling stability, shows stable and repeatable electrical response signals, and can be successfully applied to detecting various human body movements.
2) The flame-retardant conductive cotton fabric prepared in this example was subjected to a vertical burning test, and the test results are shown in table 1:
as can be seen from Table 1: the flame-retardant conductive cotton fabric can realize self-extinguishing after being exposed in flame for only 3 seconds, has no obvious smoldering phenomenon, has the carbon residue length of only 4.0cm, and shows excellent actual flame-retardant effect.
3) The flame-retardant conductive cotton fabric prepared in this example was subjected to limiting oxygen index and thermogravimetric tests, and the test results are shown in table 2:
as can be seen from Table 2: the flame-retardant conductive cotton fabric has the advantages that the limiting oxygen index is 32.0%, the maximum weight loss rate is 1.1%/DEG C, the carbon residue rate is 40.1%, and the flame-retardant conductive cotton fabric shows excellent flame retardant performance.
In conclusion, the flame-retardant conductive cotton fabric prepared by the embodiment has excellent flame retardant property, the piezoresistive pressure sensor prepared by the flame-retardant conductive cotton fabric has good pressure circulation stability, shows stable and repeatable electrical response signals, can be successfully applied to detection of various human body movements, and has great application prospect in the field of intelligent wearing.
Example 3:
a flame-retardant conductive cotton fabric is prepared by the following steps:
1) Cotton fabric (size specification of 9cm multiplied by 30cm, surface density of 127 g/m) 2 ) Treating with oxygen plasma with 40W plasma machine (VT-R3, sun June, china) at 0.2mbar for 10min to obtain pretreated cotton fabric;
2) Adding 2g of halloysite powder and 0.4g of branched polyethyleneimine into 397.6g of deionized water, and carrying out ultrasonic treatment (ultrasonic power is 0.3 kW) for 30min to obtain a branched polyethyleneimine modified halloysite powder aqueous solution;
3) Sequentially dipping the pretreated cotton fabric in the step 1) by using the branched polyethyleneimine modified halloysite powder aqueous solution, the phytic acid aqueous solution with the mass fraction of 3% and the graphene oxide aqueous solution with the concentration of 3mg/mL in the step 2), soaking the dipped cotton fabric for 1min by using deionized water, putting the cotton fabric into an oven, drying for 0.5h at 80 ℃, circularly performing dipping treatment, washing and drying for 6 times, putting the cotton fabric into the oven, and drying for 2h at 180 ℃ to obtain the flame-retardant conductive cotton fabric.
A piezoresistive pressure sensor is made of a flame-retardant conductive cotton fabric with electrodes attached to two ends.
And (3) performance testing:
1) Human body movement detection (test method same as example 1): the response curves of the piezoresistive pressure sensor prepared in the embodiment to different human body movements are similar to those of fig. 3 to 12, which shows that the sensor has good pressure cycling stability, shows stable and repeatable electrical response signals, and can be successfully applied to detecting various human body movements.
2) The flame-retardant conductive cotton fabric prepared in this example was subjected to a vertical burning test, and the test results are shown in table 1:
as can be seen from Table 1: the flame-retardant conductive cotton fabric can realize self-extinguishing after being exposed in flame for only 5 seconds, has no obvious smoldering phenomenon, has the carbon residue length of only 6.2cm, and shows excellent actual flame-retardant effect.
3) The flame-retardant conductive cotton fabric prepared in this example was subjected to limiting oxygen index and thermogravimetric tests, and the test results are shown in table 2:
as can be seen from Table 2: the flame-retardant conductive cotton fabric has the advantages that the limiting oxygen index is 30.2%, the maximum weight loss rate is 1.3%/DEG C, the carbon residue rate is 39.8%, and the flame-retardant conductive cotton fabric shows excellent flame retardant performance.
In conclusion, the flame-retardant conductive cotton fabric prepared by the embodiment has excellent flame retardant property, the piezoresistive pressure sensor prepared by the flame-retardant conductive cotton fabric has good pressure circulation stability, shows stable and repeatable electrical response signals, can be successfully applied to detection of various human body movements, and has great application prospect in the field of intelligent wearing.
Example 4:
a flame-retardant conductive cotton fabric is prepared by the following steps:
1) Cotton fabric (size specification of 9cm multiplied by 30cm, surface density of 127 g/m) 2 ) Treating with plasma machine (VT-R3, sun June, china) with power of 160W under 0.2mbar for 5min to obtain pretreated cotton fabric;
2) Adding 4g of halloysite powder and 0.4g of branched polyethyleneimine into 395.6g of deionized water, and carrying out ultrasonic treatment (the ultrasonic power is 0.3 kW) for 30min to obtain a branched polyethyleneimine modified halloysite powder aqueous solution;
3) Sequentially impregnating the pretreated cotton fabric in the step 1) with the branched polyethyleneimine modified halloysite powder aqueous solution, a phytic acid aqueous solution with the mass fraction of 5% and a graphene oxide aqueous solution with the concentration of 5mg/mL in the step 2), soaking the impregnated cotton fabric in deionized water for 1min, putting the cotton fabric into an oven, drying the cotton fabric at 80 ℃ for 0.5h, circularly performing impregnation treatment, washing and drying for 2 times, putting the cotton fabric into the oven, and drying the cotton fabric at 160 ℃ for 4h to obtain the flame-retardant conductive cotton fabric.
A piezoresistive pressure sensor is made of a flame-retardant conductive cotton fabric with electrodes attached to two ends.
And (3) performance testing:
1) Human body movement detection (test method same as example 1): the response curves of the piezoresistive pressure sensor prepared in the embodiment to different human body movements are similar to those of fig. 3 to 12, which shows that the sensor has good pressure cycling stability, shows stable and repeatable electrical response signals, and can be successfully applied to detecting various human body movements.
2) The flame-retardant conductive cotton fabric prepared in this example was subjected to a vertical burning test, and the test results are shown in table 1:
as can be seen from Table 1: the flame-retardant conductive cotton fabric can realize self-extinguishing after being exposed in flame for only 5 seconds, has no obvious smoldering phenomenon, has the carbon residue length of only 13.0cm, and shows excellent actual flame-retardant effect.
3) The flame-retardant conductive cotton fabric prepared in this example was subjected to limiting oxygen index and thermogravimetric tests, and the test results are shown in table 2:
as can be seen from Table 2: the flame-retardant conductive cotton fabric has the advantages that the limiting oxygen index is 27.8%, the maximum weight loss rate is 1.5%/DEG C, the carbon residue rate is 28.8%, and the flame-retardant conductive cotton fabric shows excellent flame retardant performance.
In conclusion, the flame-retardant conductive cotton fabric prepared by the embodiment has excellent flame retardant property, the piezoresistive pressure sensor prepared by the flame-retardant conductive cotton fabric has good pressure circulation stability, shows stable and repeatable electrical response signals, can be successfully applied to detection of various human body movements, and has great application prospect in the field of intelligent wearing.
Attached table:
table 1 vertical burning test results of the flame-retardant conductive cotton fabric of examples 1 to 4
Note: referring to GB/T5455-2014 measurement of damage length, smoldering and afterflame time of textile in the vertical direction of combustion performance, a CZF-3 horizontal vertical combustion instrument (Jianning analytical instruments, inc. of Nanjing, china) is adopted to carry out a vertical combustion test.
Table 2 limiting oxygen index and thermogravimetric test results of the flame-retardant conductive cotton fabrics of examples 1 to 4
Note:
limiting Oxygen Index (LOI): according to the 'ASTM D2863-09', the oxygen index instrument is tested by a JF-3 oxygen index instrument (China Nanjing Jiangning analytical instrument);
maximum weight loss rate: the test was carried out using a thermogravimetric analyzer TG 209F 1 (Netzsch, germany) under a nitrogen atmosphere.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A preparation method of a flame-retardant conductive cotton fabric is characterized by comprising the following steps: sequentially carrying out impregnation treatment on the cotton fabric by using a branched polyethyleneimine modified halloysite powder aqueous solution, a phytic acid aqueous solution and a graphene oxide aqueous solution, washing and drying the cotton fabric subjected to the impregnation treatment, circularly carrying out multiple times of impregnation treatment, washing and drying, and carrying out thermal reduction on the cotton fabric to obtain the flame-retardant conductive cotton fabric.
2. The method for preparing flame-retardant conductive cotton fabric according to claim 1, characterized in that: the cotton fabric was treated with oxygen plasma prior to use.
3. The method for preparing flame-retardant conductive cotton fabric according to claim 1, characterized in that: the branched polyethyleneimine modified halloysite aqueous solution is prepared by the following method: adding water into halloysite powder and branched polyethyleneimine for ultrasonic dispersion to obtain a branched polyethyleneimine modified halloysite powder aqueous solution.
4. A method for preparing a flame-retardant conductive cotton fabric according to claim 3, characterized in that: the weight ratio of the halloysite powder to the branched polyethyleneimine is 1-10.
5. The method for preparing a flame-retardant conductive cotton fabric according to any one of claims 1 to 4, which is characterized in that: the mass fraction of the phytic acid in the phytic acid aqueous solution is 3-5%.
6. The method for preparing a flame retardant conductive cotton fabric according to any one of claims 1 to 4, characterized in that: the concentration of the graphene oxide in the graphene oxide aqueous solution is 1 mg/mL-5 mg/mL.
7. The method for preparing a flame retardant conductive cotton fabric according to any one of claims 1 to 4, characterized in that: the thermal reduction is carried out at 160-180 ℃, and the thermal reduction time is 2-4 h.
8. A flame-retardant conductive cotton fabric characterized by being produced by the production method according to any one of claims 1 to 7.
9. A piezoresistive pressure sensor, characterized in that the composition comprises a flame-retardant conductive cotton fabric according to claim 8.
10. Use of the piezoresistive pressure sensor according to claim 9 for human movement detection.
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