阅读说明：本技术 一种可拉伸柔性复合织物基传感器及其应用 (Stretchable flexible composite fabric-based sensor and application thereof ) 是由 刘蓉 董城赫 武新波 于 2020-11-13 设计创作，主要内容包括：本发明涉及柔性传感器技术领域,尤其涉及一种可拉伸柔性复合织物基传感器及其应用。本发明弹性织物/导电膜复合材料制备方法中粘合剂的加入,有利于导电粒子固定在弹性织物基体上；表面活性剂和导电增强剂的加入则适当调整和改善了聚合物导电分散液的均一度和导电性,从而可均匀涂覆到弹性织物基体表面甚至内部,避免在拉伸过程中因织物结构发生形变进而导致导电基体的大距离位移,并使得导电膜复合材料的导电性能稳定；聚合物膜对导电复合材料的包覆可有效阻隔空气中湿度的影响,提高传感器的稳定性和测试精确性。本发明提供的织物基传感器制备方法简单,易操作,制备成本低,可和信息采集系统相连监测物体体积,形态或周长变化。(The invention relates to the technical field of flexible sensors, in particular to a stretchable flexible composite fabric-based sensor and application thereof. The addition of the adhesive in the preparation method of the elastic fabric/conductive film composite material is beneficial to fixing the conductive particles on the elastic fabric substrate; the addition of the surfactant and the conductive reinforcing agent properly adjusts and improves the uniformity and the conductivity of the polymer conductive dispersion liquid, so that the polymer conductive dispersion liquid can be uniformly coated on the surface or even inside of an elastic fabric substrate, the large-distance displacement of the conductive substrate caused by the deformation of a fabric structure in the stretching process is avoided, and the conductivity of the conductive film composite material is stable; the polymer film can effectively block the influence of humidity in the air by coating the conductive composite material, and the stability and the test accuracy of the sensor are improved. The fabric-based sensor provided by the invention has the advantages of simple preparation method, easiness in operation and low preparation cost, and can be connected with an information acquisition system to monitor the volume, form or perimeter change of an object.)

1. The preparation method of the elastic fabric/conductive film composite material is characterized by comprising the following steps of:

step 1: mixing and homogenizing poly (3, 4-vinyl dioxythiophene), poly (styrene sulfonate) aqueous phase dispersion liquid, a surfactant, a conductive reinforcing agent and a binder to obtain conductive matrix dispersion liquid;

step 2: and soaking the elastic fabric in the conductive matrix dispersion liquid, then squeezing to remove excessive solution on the elastic fabric, and drying to obtain the elastic fabric/conductive film composite material.

2. The method of claim 1, wherein the surfactant is selected from dodecylbenzene sulfonic acid or sodium dodecyl sulfate;

the adhesive is a waterborne polyurethane adhesive, the solid content is 30-60%, and the viscosity is 1000-3000 mpa.s;

the conductivity enhancer is selected from dimethyl sulfoxide or ethylene glycol.

3. The production method according to claim 1, wherein the mass ratio of the poly (3, 4-ethylenedioxythiophene): poly (styrenesulfonate) aqueous dispersion, the surfactant, the conductivity enhancer, and the binder is (90 to 95): (0.5-1.5) 5: (0-5);

the solid content of the poly (3, 4-vinyl dioxythiophene) and poly (styrene sulfonate) aqueous phase dispersion liquid is 1.0-1.5 wt%.

4. The production method according to claim 1, wherein the mass ratio of the conductive matrix dispersion liquid to the elastic fabric in step 2 is (3:1) to (10: 1);

the soaking time is 5-15 mins.

5. The method according to claim 1, further comprising, before the drying in step 2: and repeating the soaking and the extruding for 1-10 times.

6. The method of claim 1, wherein the elastic fabric is selected from cotton, modal or interlocked brocade and cotton fabric.

7. An elastic fabric/conductive film composite material, characterized by being produced by the production method according to any one of claims 1 to 6.

8. Use of the elastic fabric/conductive film composite of claim 7 in a stretchable flexible sensor.

9. A stretchable flexible composite fabric-based sensor, wherein the stretchable flexible composite fabric-based sensor is prepared by the steps of:

connecting conducting wires at two ends of the elastic fabric/conducting film composite material of claim 7, coating silver paste at the connecting points, and then performing hot-pressing sealing on the elastic fabric/conducting film composite material by using a high-elasticity polymer film to obtain the stretchable flexible composite fabric-based sensor.

10. A stretchable flexible composite fabric-based sensor according to claim 9, wherein said highly elastic polymer film is a thermoplastic polyurethane film;

the thickness of the thermoplastic polyurethane film is 0.01-0.05 mm;

the hot-pressing sealing time is 20-40 s, the temperature is 140-150 ℃, and the pressure is 6 MPa.

11. An information acquisition system, characterized in that the stretchable flexible composite fabric-based sensor according to claim 9 or 10 is connected with a data acquisition system, and is connected with a mobile unit application program or a computer through a bluetooth module of the data acquisition system, and the mobile unit or the computer is provided with display software for displaying analyzed data.

Technical Field

The invention relates to the technical field of flexible sensors, in particular to a stretchable flexible composite fabric-based sensor and application thereof.

Background

With the development of science and technology and the promotion of people to the health concern, wearable sensors are increasingly important in the fields of motion analysis, biomedicine, human monitoring and the like. Conventional sensors are mainly prepared based on materials such as metal and silicon, such as surface sensors [ patent application publication No.: CN102782700A, and integrated circuit devices having windows for exposing integrated circuit chips [ patent application publication No.: CN1163477A, etc., which are highly sensitive and can monitor fine volume and motion changes, but due to poor elasticity and softness of metal and silicon, the conventional sensors have limitations in application in wearable electronics field, for example, they cannot monitor significant displacement and volume changes, and have high manufacturing cost, complex process, heavy weight, etc. In recent years, flexible wearable stretching sensors have attracted much attention due to their high sensitivity and flexibility, for example, they can monitor and sense the change of the motion state, the form change or the change of physiological parameters (such as heartbeat) of the human body at any time.

The sensing mechanism of the flexible sensor for wearable monitoring mainly comprises modes such as piezoresistance, piezoelectricity, resistance strain type and the like, and according to different mechanisms, the flexible sensor can generate different electric signals according to the mechanical deformation of materials. Among various types of flexible conductive sensor parts, the resistance strain type sensor part is relatively simple to manufacture, is easy to obtain electric signals, is low in manufacturing cost, and can be used as a substrate by using high-elastic textiles to achieve the purposes of being wearable, monitoring the electric signals in real time and the like. However, the flexible sensor manufactured at present has the problems that the bonding force between the conductive material in the sensor and the surface of the fabric is not strong, the conductive material is not uniformly distributed on the surface of the fabric substrate, and the like.

Disclosure of Invention

In view of the above, the invention provides a stretchable flexible composite fabric-based sensor and an application thereof, the preparation method of the elastic fabric/conductive film composite material in the stretchable flexible composite fabric-based sensor is simple, and the conductive matrix in the prepared elastic fabric/conductive film composite material is uniformly distributed on the surface of the fabric matrix and has good bonding force.

The specific technical scheme is as follows:

the invention provides a preparation method of an elastic fabric/conductive film composite material, which comprises the following steps:

step 1: mixing and homogenizing poly (3, 4-vinyl dioxythiophene), poly (styrene sulfonate) aqueous phase dispersion liquid, a surfactant, a binder and a conductive reinforcing agent to obtain conductive matrix dispersion liquid;

step 2: and soaking the elastic fabric in the conductive matrix dispersion liquid, extruding out excessive solution on the elastic fabric, and drying to obtain the elastic fabric/conductive film composite material.

Preferably, the surfactant is selected from dodecylbenzene sulfonic acid or sodium dodecyl sulfate;

the adhesive is a water-based polyurethane adhesive, the solid content is 30-60%, and the viscosity is 1000-3000 mpa.s;

the conductivity enhancer is selected from dimethyl sulfoxide or ethylene glycol;

preferably, the mass ratio of the poly (3, 4-ethylenedioxythiophene) to the poly (styrene sulfonate) aqueous phase dispersion to the surfactant to the conductivity enhancer to the binder is (90-95): (0.5-1.5) 5: (0-5);

the solid content of the poly (3, 4-vinyl dioxythiophene) and poly (styrene sulfonate) aqueous phase dispersion liquid is 1.0-1.5%.

Preferably, the mass ratio of the conductive matrix solution to the elastic fabric in the step 2 is (3:1) - (10: 1);

the soaking time is 5-15 mins.

Preferably, step 2 further comprises, before drying: and repeating the soaking and the extruding for 1-10 times.

Preferably, the elastic fabric is selected from cotton, modal or interlocked brocade cotton fabric.

The invention also provides an elastic fabric/conductive film composite material prepared by the preparation method.

The invention also provides the application of the elastic fabric/conductive film composite material in a stretchable flexible sensor.

The invention also provides a stretchable flexible composite fabric-based sensor, which is prepared by the following steps:

connecting two ends of the elastic fabric/conductive film composite material with leads, coating silver paste at the connecting points, and then carrying out hot-pressing sealing on the elastic fabric/conductive film composite material by adopting a high-elasticity polymer film to obtain the stretchable flexible composite fabric-based sensor.

Preferably, the high-elasticity polymer film is a thermoplastic polyurethane film;

the thickness of the thermoplastic polyurethane film is 0.01-0.05 mm;

the hot-pressing sealing time is 20-40 s, the temperature is 140-150 ℃, and the pressure is 6 MPa.

The invention also provides an information acquisition system, wherein the stretchable flexible composite fabric-based sensor is connected with the data acquisition system, and is connected with a mobile unit application program through a Bluetooth module of the data acquisition system, and display software is installed on a mobile unit or a computer to display analyzed data.

According to the technical scheme, the invention has the following advantages:

the invention provides a preparation method of an elastic fabric/conductive film composite material, wherein the addition of an adhesive in the preparation method is beneficial to fixing conductive particles poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) on an elastic fabric substrate; the surfactant and the conductive reinforcing agent can properly adjust and improve the uniformity and the conductivity of the poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) conductive particles in the dispersion liquid, so that the poly (styrene sulfonate) conductive particles can be uniformly coated on the surface and even the inside of an elastic fabric substrate, the large-distance displacement of the conductive substrate caused by the deformation of the elastic fabric structure in the stretching process is avoided, and the conductive performance of the conductive film composite material is stable; in addition, the conductive matrix is a uniform dispersion liquid, and has good dipping effect on the elastic fabric. The preparation method of the elastic fabric/conductive film composite material provided by the invention is simple, easy to operate and low in preparation cost.

The elastic fabric/conductive film composite material provided by the invention can be applied to a stretchable flexible composite fabric-based sensor, the changes of the volume and the action frequency of an object can be monitored by utilizing an electric signal generated by the elastic fabric in the stretching process (the length change rate is within 0-200%), the electric signal can be collected by a data acquisition system through calibration and verification, and the movement amplitude, the frequency or the state change of the object can be monitored at any time through connecting a Bluetooth module arranged in the data acquisition system with a mobile unit.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a flow chart illustrating the fabrication of a stretchable flexible composite fabric-based sensor according to an embodiment of the present invention;

FIG. 2 is a scanning electron microscope image of the elastic fabric/conductive film composite prepared in example 3 of the present invention;

FIG. 3 is a schematic structural diagram of a stretchable flexible composite fabric-based sensor manufactured in example 4 of the present invention;

FIG. 4 is a graph showing the relationship between the stretching deformation and the electrical signal of the stretchable flexible composite fabric-based sensor manufactured in example 4 of the present invention;

FIG. 5 is a graph showing the repeated stability test of the stretchable flexible composite fabric-based sensor prepared in example 4 of the present invention after being pre-stretched;

FIG. 6 is a graph showing the effect of the stretchable flexible composite fabric-based sensor according to example 4 of the present invention on the resistance to moisture.

FIG. 7 is a schematic perspective view of a stretchable flexible composite fabric-based sensor manufactured in example 4 of the present invention;

fig. 8-1 is a view of an application scene of the stretchable flexible composite fabric-based sensor manufactured in example 4 of the present invention worn on an ankle;

FIG. 8-2 is a view showing an application of the stretchable flexible composite fabric-based sensor manufactured in example 4 of the present invention to an ankle by being coupled to a counter;

fig. 8-3 are views of the application scene of the stretchable flexible composite fabric-based sensor according to example 4 of the present invention worn on the chest;

8-4 are application scene diagrams of the stretchable flexible composite fabric-based sensor manufactured in example 4 of the present invention worn on the leg and arm;

FIG. 9 is a schematic diagram of a main interface in embodiment 5 of the present invention;

fig. 10 is a schematic view of a setting interface and an application mode interface in embodiment 5 of the present invention;

fig. 11 is a schematic diagram of a real-time data real-time display interface in embodiment 5 of the present invention;

FIG. 12 is a schematic diagram of a user information interface in embodiment 5 of the present invention;

fig. 13 is a schematic diagram of a history recording interface in embodiment 5 of the present invention.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it should be apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a preparation method of an elastic fabric/conductive film composite material, which comprises the following steps:

step 1: mixing and homogenizing poly (3, 4-vinyl dioxythiophene), poly (styrene sulfonate) aqueous phase dispersion liquid, a surfactant, a binder and a conductive reinforcing agent to obtain conductive matrix dispersion liquid;

step 2: and soaking the elastic fabric in the conductive matrix dispersion liquid, then squeezing to remove excessive solution on the elastic fabric, and drying to obtain the elastic fabric/conductive film composite material.

The addition of the adhesive is beneficial to fixing the conductive particles of poly (3, 4-ethylenedioxythiophene) (poly (styrene sulfonate)) on the elastic fabric substrate; the surfactant and the conductive reinforcing agent are used for adjusting and improving the uniformity and the conductivity of the poly (3, 4-ethylenedioxythiophene) and poly (styrene sulfonate) conductive particles in the dispersion liquid, so that the poly (styrene sulfonate) conductive particles can be uniformly coated on the surface or even the inside of an elastic fabric substrate, the large-distance displacement of the conductive substrate caused by the structure transformation of the elastic fabric in the stretching process is avoided, and the conductivity of the elastic fabric/conductive film composite material is kept stable; in addition, the conductive matrix is a uniform dispersion liquid, and has good dipping effect on the elastic fabric. The preparation method of the elastic fabric/conductive film composite material provided by the invention is simple, easy to operate and low in preparation cost.

In step 1 of the present invention, poly (3, 4-ethylenedioxythiophene), the aqueous dispersion of poly (styrenesulfonate), the surfactant and the conductivity enhancer are preferably mixed by using a syringe and allowed to stand; stirring for 15mins at 400r/min by using a magnetic stirrer preferably, standing to remove bubbles generated in the stirring process, and preferably standing for 12 h;

the surfactant is selected from dodecyl benzene sulfonic acid or sodium dodecyl sulfate, preferably dodecyl benzene sulfonic acid, and the purity is 95%;

the conductivity enhancer is selected from dimethyl sulfoxide or ethylene glycol, preferably dimethyl sulfoxide, and the purity is 99.7%;

the mass ratio of the poly (3, 4-vinyl dioxythiophene), the poly (styrene sulfonate) aqueous phase dispersion liquid, the surfactant, the conductivity enhancer and the adhesive is (90-95): (0.5-1.5): 5, preferably 95:1: 5;

the solid content of the poly (3, 4-vinyl dioxythiophene) poly (styrene sulfonate) aqueous phase dispersion liquid is 1-1.5 wt%, preferably 1.3 wt%, and the content of the surfactant in the dispersion liquid is preferably 1 wt%;

after standing, preferably, a binder is dropped into the mixture by using a syringe for mixing, and the mixture is homogenized to obtain a conductive matrix dispersion liquid; mixing, preferably using a magnetic stirrer, for 30mins at 1000r/min to homogenize, to obtain a uniform and pasty dispersion of the conductive matrix; then standing for 12h for later use.

The selected adhesive is a waterborne polyurethane adhesive, the solid content is 30-60%, and the viscosity is 1000-3000 mpa.s;

the mass ratio of the poly (3, 4-vinyl dioxythiophene) to the poly (styrene sulfonate) dispersion to the adhesive is (90-95): (0 to 5), preferably 95: 2. as the amount of binder is decreased, the amount of poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) is increased proportionally, resulting in a corresponding decrease in viscosity.

Before step 2, the method further comprises the following steps: pretreating the elastic fabric;

the pretreatment specifically comprises the following steps: washing the elastic fabric with distilled water, then putting the elastic fabric into an ethanol solution, carrying out ultrasonic treatment at room temperature to thoroughly clean the elastic fabric, and then drying the elastic fabric after ultrasonic treatment to obtain a clean elastic fabric;

the elastic fabric is preferably cut into rectangular cloth pieces with the length of 70 mm and the width of 25 mm; the temperature of the ultrasonic treatment is preferably room temperature, the time is preferably 15mins, and the power is preferably 100W.

The invention can obviously increase the binding force between the fabric and the conductive layer by pretreating the elastic fabric.

In step 2 of the invention, the elastic fabric is soaked in the conductive matrix dispersion liquid, so that the conductive matrix dispersion liquid soaks the elastic fabric;

the elastic fabric is selected from cotton cloth, modal or nylon-cotton fabric with an interlocking structure, and is preferably nylon-cotton fabric with an interlocking structure. The sensor with different performances in the radial direction and the weft direction can be prepared by adopting an interlocking fabric structure and compounding the conductive polymers, and can meet the requirement of multidirectional use.

The mass ratio of the conductive matrix dispersion liquid to the elastic fabric is 3: 1-10: 1, preferably 5: 1;

the soaking time is 5-15 mins, preferably 15 mins;

then, preferably, a padding machine is adopted to squeeze and remove redundant solution on the elastic fabric, and after padding for 1-10 times, the elastic fabric/conductive film composite material is obtained after drying; the fabric is damaged by padding for 1-10 times, so that the fabric achieves the best conductivity, and the fabric cannot be damaged.

The temperature for drying is preferably 80 ℃ and the time is preferably 30 mins.

The present invention further enables the conductive matrix to be uniformly distributed on the surface of the fibers within the elastomeric fabric using a padding process.

The invention also provides an elastic fabric/conductive film composite material prepared by the preparation method.

According to the invention, the elastic fabric/conductive film composite material comprises an elastic fabric and a conductive substrate coated on the fiber surface of the elastic fabric, wherein the conductive substrate is in a film structure.

The elastic fabric/conductive film composite material provided by the invention has conductivity and flexibility, and therefore, the invention also provides application of the elastic fabric/conductive film composite material in a stretchable flexible sensor.

The invention also provides a stretchable flexible composite fabric-based sensor which is prepared by the following steps:

connecting two ends of the elastic fabric/conductive film composite material with leads, brushing silver paste at the connecting points, and then carrying out hot-pressing sealing on the elastic fabric/conductive film composite material by adopting a high-elasticity polymer to obtain the stretchable flexible composite fabric-based sensor.

According to the invention, the stretchable flexible composite fabric-based sensor is subjected to pre-stretching treatment under application conditions, so that the influence of microscopic flaws of the fabric or conductive particles among fabric fibers on the conductive performance in the repeated stretching process is removed.

The resistance of the stretchable flexible composite fabric-based sensor is 300-50000 ohms, and the conductivity is proper.

In the present invention, in order to obtain good electrical contact, electrodes are preferably connected to both ends of the conductive film composite through silver paste, and the electrodes are preferably conductive yarns.

The invention only adopts the high-elasticity polymer film to carry out double-sided hot pressing on the conductive film composite material under the condition of not using an adhesive, thereby not only avoiding the problem that a high-molecular flexible device is influenced by the environmental humidity, but also keeping good flexibility and compliance, and ensuring that the sensor has stable performance. Moreover, the stretchable flexible composite fabric-based sensor has good strength, flexibility and conductivity, and the shape can be customized. The preparation method is simple, easy to operate and low in preparation cost. The stretchable flexible composite fabric-based sensor can detect the volume and form change of an object in real time, is suitable for various application fields of wearable devices (clothes, shoes and the like), and is particularly suitable for monitoring the change of human bodies such as action frequency, limb states or motion amplitude and the like so as to monitor and analyze the posture, gait, motion efficiency, health state and the like of the human bodies.

In the invention, the high-elasticity polymer film is a thermoplastic polyurethane film;

too thin a thickness of the thermoplastic polyurethane film results in a film that is not scratch resistant and is susceptible to cracking after being subjected to abrasion. Too thick a thickness may result in poor elasticity. Therefore, the thickness of the thermoplastic polyurethane film is 0.01-0.05 mm, preferably 0.02mm, and the hardness is preferably 85A;

the hot-pressing sealing time is 20-40 s, the temperature is 140-150 ℃, and the pressure is 6 MPa.

In the invention, the stretchable flexible composite fabric-based sensor is connected with a data acquisition system and is connected with a mobile unit or a computer through a Bluetooth module of the data acquisition system, and display software is installed on the mobile unit or the computer and is used for displaying analyzed data.

The stretchable flexible composite fabric-based sensing sensor can monitor the motion frequency and state change of an object by utilizing an electric signal generated by an elastic fabric in a stretching process (the length change rate is within 0-100%), the electric signal can be collected by a data acquisition system through calibration and verification, and the electric signal is connected with a mobile unit through a Bluetooth module installed in the data acquisition system so as to monitor the volume, the shape or the perimeter change of the object at any time.

The data acquisition system provided by the invention uses a minimum system circuit with 12-bit AD data acquisition of an STM32 singlechip as a core, calibrates the precision and the measurement range of the data acquisition system through a standard resistor, calibrates the sensor reference, and can repeatedly carry out measurement verification.

In the present invention, the room temperature is 25 ℃. + -. 5 ℃.

For a further understanding of the invention, reference will now be made in detail to the following examples.

In the examples of the present invention, the raw materials and reagents were all commercially available.

Example 1

This example was carried out for the preparation of a conductive base (see FIG. 1)

95 parts of poly (3, 4-vinyldioxythiophene): poly (styrenesulfonate) dispersion (solid content 1.3mg/ml), 1 part of dodecylbenzenesulfonic acid (purity 95 wt%), and 5 parts of dimethyl sulfoxide (purity 99.7 wt%) were first mixed using a syringe, stirred with a magnetic stirrer at 400r/min for 15mins, and allowed to stand for 12 hours. Then, 2 parts of an aqueous polyurethane binder (40% in terms of solid content) solution was slowly dropped using a syringe while the above mixture was stirred with a magnetic stirrer at 1000r/min, and homogenization was performed with continuous stirring for 30mins to obtain a uniform paste-like electroconductive base dispersion, which was then allowed to stand for 12 hours.

Example 2

This example carried out pretreatment of the elastic fabric substrate

The elastic fabric is cut into rectangular cloth pieces with the length of 70 mm and the width of 25 mm, the cloth pieces are washed with distilled water for three times and then placed into a beaker with the volume of 100 ml and containing 60 ml of ethanol, and the beaker is treated by ultrasonic waves (the ultrasonic power is 100W) for 10mins under the room temperature condition, so that the elastic fabric is thoroughly cleaned. The above-sonicated samples were then dried in an oven at 80 degrees for 30mins to obtain a clean, pre-treated elastic fabric substrate.

Example 3

This example is the preparation of an elastic fabric/conductive film composite (see FIG. 1)

20 ml of the conductive matrix dispersion prepared in example 1 was removed and placed in a 100 ml beaker, and then the pretreated elastic fabric substrate (size 70.0 mm. times.25.0 mm) obtained in example 2 was added, wherein the mass ratio of the conductive dispersion to the elastic fabric substrate was 5: 1. Stirring and soaking with a glass rod at room temperature for 15min to thoroughly soak the conductive matrix into the fabric substrate, and squeezing excess conductive matrix solution from the elastic fabric substrate with a pad mangle (pad mangle pressure value set to 2 kg/cm)²) And after padding for three times, drying the sample in an oven at 80 ℃ for 30mins to obtain the conductive film composite material. Taking the prepared elastic fabric/conductive composite material out of the oven, and directly sealing and storing in a sample bag. The elastic fabric/conductive film composite material prepared in example 3 was examined by using a microscopic scanning electron microscope, and a scanning electron microscope photograph thereof is shown in fig. 2. From fig. 2 it can be seen that the surface morphology of the elastic fabric/conductive film composite and the film-like structure of the conductive polymer matrix and the conductive polymer matrix are uniformly coated on the fabric.

Example 4

This example is the preparation of a stretchable flexible composite fabric-based sensor (see FIG. 1)

Taking the elastic fabric/conductive film composite material prepared in the embodiment 3 out of the sealing bag, drying the elastic fabric/conductive film composite material in an oven at 80 ℃ for 60mins, connecting wires at two ends of the conductive film composite material, coating silver paste at connecting points to enhance conductivity, taking a thermoplastic polyurethane film with the thickness of 0.02mm, and sealing the elastic fabric/conductive film composite material prepared in the embodiment 3 through hot pressing, wherein the hot pressing time is 25 seconds, the pressure is 6MPa, and the hot pressing temperature is 140 ℃. The coated elastic fabric/conductive film composite material obtained after hot pressing is the stretchable flexible composite fabric-based sensor. The stretchable flexible composite fabric-based sensor is subjected to a pre-stretching process under an application condition, so that the influence of microscopic flaws of the fabric or conductive particles among fabric fibers on the conductive performance in a repeated stretching process is removed.

It was determined that the stretchable flexible composite fabric-based sensor sample of selected dimensions prepared in this example had an initial value of resistance of about 1100 ohms in the length direction (both ends in the length direction test), an initial value of resistance of about 5700 ohms after pre-stretching, and an initial value of resistance of about 7800 ohms when the stretched length was 50%, with appropriate changes in conductivity before and after stretching.

Fig. 3 is a schematic structural diagram of a stretchable flexible composite fabric-based sensor manufactured in example 4 of the present invention. It can be seen from fig. 3 that the conductive film composite is encased within a thermoplastic polyurethane film.

Fig. 4 is a graph showing the relationship between the stretching deformation and the electrical signal of the stretchable flexible composite fabric-based sensor manufactured in example 4 of the present invention. The results show that the stretching rate and the electric signals of the stretchable flexible composite fabric-based sensor prepared in the embodiment are changed in an increasing way in a given small stretching range, and the stretchable flexible composite fabric-based sensor can be used for measuring the change of the structure size of a human body. And the change of the action frequency and the motion amplitude can be accurately measured in a large stretching range.

Fig. 5 is a graph showing repeated stability tests of the stretchable flexible composite fabric-based sensor manufactured in example 4 of the present invention after being pre-stretched. The results of 500 times of tensile tests show that the tensile flexible composite fabric-based sensor has stable electric signal change range and can be used for signal monitoring.

FIG. 6 is a graph showing the effect of humidity on the stretchable flexible composite fabric-based sensor according to example 4 of the present invention. The method is to compare the resistance measured after samples of the same size are placed under different humidity conditions for 20 mins. It can be seen from fig. 6 that the elastic fabric/conductive composite is encapsulated in the sealed thermoplastic polyurethane film to avoid the effect of humidity.

Example 5

The embodiment is an application embodiment of the stretchable flexible composite fabric-based sensor for monitoring the state and the change of the human body.

The stretchable flexible composite fabric-based sensor is connected with the data acquisition module, the data acquisition module acquires data monitored by the sensor in real time, the data acquisition system is connected with the mobile phone through the Bluetooth module, and the mobile phone can display the data acquired by the sensor in real time or display the data after analyzing the data acquired in real time.

Fig. 8 is a schematic perspective view of a stretchable flexible composite fabric-based sensor manufactured according to example 4 of the present invention. Fig. 8-1 is a view of an application scenario of the stretchable flexible composite fabric-based sensor according to example 4 of the present invention worn on an ankle. Fig. 8-2 are views showing the application of the stretchable flexible composite fabric-based sensor according to example 4 of the present invention to the ankle by connecting to the counter (the counter wire and the stretchable flexible composite fabric-based sensor may be connected by two metal snaps). Fig. 8-3 and 8-4 are views of the application scene of the stretchable flexible composite fabric-based sensor worn on the chest and the legs, which is prepared by the embodiment of the invention, and schematic diagrams. As can be seen from fig. 8-1 and 8-2, the stretchable flexible composite fabric-based sensor is worn or fixed on the ankle as a wearable device, monitoring swelling of the ankle or a change in the movement state in real time. As can be seen from fig. 8-3 and 8-4, the stretchable flexible composite fabric-based sensor can be worn on the chest to monitor changes in the frequency of chest breathing and also on the legs and arms to monitor changes in the form of the local limb during flexion movements.

Displaying an interface on the mobile phone, the interface comprising:

referring to fig. 9, fig. 9 is a schematic diagram of a main interface of the present embodiment. The display interface is a home page, all pages of states, settings, queries and the like are imported through the page, and the page is returned to after the completion. Including the options: status-state; Setting-Setting; Data-Data monitoring interface; user Information-User Information; History-History. The options of the main interface can be modified according to the needs;

referring to fig. 10, fig. 10 is a schematic diagram of a setting interface and an application mode interface of the present embodiment. Clicking the Setting button of the Setting page of fig. 9 to enter an application mode interface: Setting-Setting page: mode-application Mode selection page;

referring to fig. 11, fig. 11 is a schematic diagram of a real-time data real-time display interface according to the embodiment. Page entered after clicking on the Data option of fig. 9: Max-Max; Min-Min; Current-Current; the data format and the curve format can be displayed in real time.

Referring to fig. 12, fig. 12 is a schematic view of a user information interface according to the present embodiment. Clicking the User option of FIG. 9 enters the User information page: according to the selection of user data information and the selection of treatment date, monitoring data records can be inquired by the old user and the newly added user.

Referring to fig. 13, fig. 13 is a schematic diagram of a history recording interface according to the embodiment. Click on the page entered after the History option of FIG. 9: specific dates, application modes and times may be selected to query the monitored data records.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.