Preparation method of sensor module, sensor module and monitoring system

Abstract

The invention relates to the technical field of health monitoring, in particular to a preparation method of a sensor module, the sensor module and a monitoring system. The invention provides a preparation method of a sensor module. The preparation method comprises the following steps: providing butanediol, lactic acid, sebacic acid and itaconic acid as raw materials; mixing and reacting the raw materials to obtain a prefabricated elastomer; the method comprises the following steps: dissolving a prefabricated elastomer by using chlorinated hydrocarbon, and sequentially carrying out drying treatment and cross-linking treatment to obtain the piezoelectric elastomer, providing a plurality of pasting layers, dividing the piezoelectric elastomer into a plurality of piezoelectric layers corresponding to the pasting layers, and arranging the piezoelectric layers in the pasting layers; providing signal lines, and arranging the signal lines on the pasting layer to obtain a plurality of sensor modules; a plurality of sensor modules are electrically connected to obtain a sensor module. The invention provides a method for preparing the sensor which can relatively completely collect the motion data of the whole body and is relatively light.

Description

[Technical field]

[0001] The present invention relates to the technical field of health monitoring, and in particular to a method for preparing a sensor module, a sensor module and a monitoring system. [Background technology]

[0002] With the development of economy and the progress of society, people are paying more and more attention to their physical health. The rehabilitation industry is developing rapidly. New technologies such as exoskeleton robots, rehabilitation gloves, and AI rehabilitation are emerging in an endless stream. Among them, sensors for collecting rehabilitation data are the core of rehabilitation equipment. Usually, such rehabilitation sensors are used in conjunction with exoskeleton machines or some rigid mechanical structures. The overall equipment is bulky and the measurement site is relatively single, and it is impossible to collect almost complete movement data of the whole body.

[0003] When monitoring human joints, existing monitors are bulky and heavy, so it is particularly important to find a way to prepare a sensor that can collect the whole body's motion data more completely and is relatively lightweight. [Summary of the invention]

[0004] In order to provide a method for preparing a sensor that can relatively completely collect whole-body motion data and is relatively lightweight, the present invention provides a method for preparing a sensor module, a sensor module and a monitoring system.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for preparing a sensor module, comprising the following steps:

[0006] providing butanediol, lactic acid, sebacic acid and itaconic acid as raw materials;

[0007] The raw materials are mixed and reacted to obtain a preformed elastomer;

[0008] The prefabricated elastomer is dissolved by chlorinated hydrocarbon, and then dried and cross-linked to obtain the piezoelectric elastomer;

[0009] Providing a plurality of coating layers, dividing the piezoelectric elastic body into a plurality of piezoelectric layers corresponding to the coating layers, and arranging the piezoelectric layers in the coating layers;

[0010] Providing signal lines, and arranging the signal lines on the coating layer to obtain a plurality of sensor modules;

[0011] Multiple sensor modules are connected in parallel to obtain a sensor module.

[0012] Preferably, the molar ratio of lactic acid:butanediol:sebacic acid:itaconic acid in the preformed elastomer is in the range of (22-23):(16-17):

[0013] (10-12):(2~3).

[0014] Preferably, the molar content of itaconic acid in the preformed elastomer is 30% to 50% of the preformed elastomer.

[0015] Preferably, mixing the raw materials comprises:

[0016] The raw materials are stirred and mixed under a protective gas atmosphere;

[0017] After mixing, heating for the first time to a first temperature and reacting for a first time;

[0018] Continue heating for the second time to the second temperature and react for the second time,

[0019] Continue heating for a third time to a third temperature, and add a catalyst to carry out a reduced pressure treatment reaction for a third time to obtain a prefabricated elastomer;

[0020] Among them, the first temperature is 130℃~135℃, the second temperature is 175℃~180℃, and the third temperature is 220℃~225℃;

[0021] The first time is 50 to 60 minutes, the second time is 110 to 120 minutes, and the third time is 7.9 to 8 hours.

[0022] Preferably, the drying process specifically includes:

[0023] Excess methanol is added to the solution after the prefabricated elastomer is dissolved, and then the solution is allowed to stand and filtered in sequence to obtain a precipitated sample, and the precipitated sample is dried at 50-60° C. to obtain an amorphous elastomer.

[0024] Preferably, the cross-linking treatment specifically includes:

[0025] Providing dicumyl peroxide, mixing an amorphous elastomer and dicumyl peroxide in a mass ratio of 1000:1, and performing a banburying treatment at 80-82° C. for 110-120 minutes;

[0026] After kneading, the mixture is cross-linked at 160-162° C. for 10-12 minutes to obtain a piezoelectric elastomer.

[0027] In order to solve the above technical problems, the present invention provides another technical solution as follows: a sensor module is prepared by the above sensor module preparation method, the sensor module comprises: a plurality of sensor modules, connecting wires and a detection module;

[0028] The sensor module comprises a coating layer, a piezoelectric layer is arranged in the coating layer, and a signal line electrically connected to the piezoelectric layer is arranged on the coating layer;

[0029] The detection module is electrically connected to the signal line through the connecting line.

[0030] Preferably, the sensor module is any one or more combinations of a pressure sensor module, a velocity sensor module, a displacement sensor module or an acceleration sensor module.

[0031] Preferably, the area of ​​the coating layer is larger than the area of ​​the piezoelectric layer.

[0032] In order to solve the above technical problems, the present invention provides another technical solution as follows: a monitoring system, comprising a sensor module prepared by the above sensor module preparation method, a storage module and an analysis module, wherein the sensor module is electrically connected to the storage module and the analysis module respectively.

[0033] Compared with the prior art, the sensor module preparation method, sensor module and monitoring system provided by the present invention have the following beneficial effects:

[0034] 1. A method for preparing a sensor module provided by an embodiment of the present invention comprises the following steps:

[0035] providing butanediol, lactic acid, sebacic acid and itaconic acid as raw materials;

[0036] The raw materials are mixed and reacted to obtain a preformed elastomer;

[0037] The prefabricated elastomer is dissolved by chlorinated hydrocarbon, and then dried and cross-linked to obtain the piezoelectric elastomer;

[0038] Providing a plurality of coating layers, dividing the piezoelectric elastic body into a plurality of piezoelectric layers corresponding to the coating layers, and arranging the piezoelectric layers in the coating layers;

[0039] Providing signal lines, and arranging the signal lines on the coating layer to obtain a plurality of sensor modules;

[0040] Multiple sensor modules are connected in parallel to obtain a sensor module.

[0041] In this embodiment, butanediol, lactic acid, sebacic acid and itaconic acid are cleverly used as raw materials to prepare a piezoelectric elastomer that is light in size, has a low elastic modulus and good piezoelectric properties. The sensor module in this embodiment solves the problem that the existing sensors are relatively bulky. A piezoelectric elastomer that is light in size and has good piezoelectric properties is used as the piezoelectric layer. In the sensor module, the deformation of the piezoelectric layer is caused by the deformation of the coating layer, which can respond to generate an electrical signal. Since both the coating layer and the piezoelectric layer are relatively light, the piezoelectric module has the characteristics of being light in size, and the piezoelectric response of the piezoelectric layer is good, so the data acquisition accuracy of the piezoelectric module is high. In addition, the piezoelectric layer has a good self-healing ability, so the service life of the piezoelectric module is long.

[0042] 2. The molar ratio of lactic acid: butanediol: sebacic acid: itaconic acid in the prefabricated elastomer of the embodiment of the present invention is in the range of (22-23): (16-17): (10-12): (2-3). This embodiment limits the ratio of raw materials so that the prepared piezoelectric elastomer has not only a lower elastic modulus but also better piezoelectric performance.

[0043] 3. The molar ratio of itaconic acid in the prefabricated elastomer of the embodiment of the present invention accounts for 30% to 50% of the prefabricated elastomer. By controlling the proportion of itaconic acid in the prefabricated elastomer, the mobility of the chain formed by the final copolymerization of the prefabricated elastomer can be enhanced, and the accumulation of the chain can be promoted, the chain flexibility effect can be enhanced, and the glass transition temperature can be reduced and crystallization can be inhibited, thereby optimizing the preparation process.

[0044] 4. In the embodiment of the present invention, the raw materials are mixed and reacted, including:

[0045] The raw materials are stirred and mixed under a protective gas atmosphere;

[0046] After mixing, heating for the first time to a first temperature and reacting for a first time;

[0047] Continue heating for the second time to the second temperature and react for the second time,

[0048] Continue heating for a third time to a third temperature, and add a catalyst to carry out a reduced pressure treatment reaction for a third time to obtain a prefabricated elastomer;

[0049] Among them, the first temperature is 130℃~135℃, the second temperature is 175℃~180℃, and the third temperature is 220℃~225℃;

[0050] The first time is 50 to 60 minutes, the second time is 110 to 120 minutes, and the third time is 7.9 to 8 hours. The temperature increase before adding the catalyst avoids the occurrence of homopolymerization. The third temperature increase after adding the catalyst increases the reaction speed, thereby completing the copolymerization of the raw materials as soon as possible to prepare the prefabricated elastomer.

[0051] 5. The drying process of the embodiment of the present invention specifically includes:

[0052] Adding excess methanol to the solution after the prefabricated elastomer is dissolved, the solution is allowed to stand and filtered in sequence to obtain a precipitated sample, and the precipitated sample is dried at 50-60° C. to obtain an amorphous elastomer. The operation is simple.

[0053] 6. The cross-linking treatment in the embodiment of the present invention specifically includes:

[0054] Providing dicumyl peroxide, mixing an amorphous elastomer and dicumyl peroxide in a mass ratio of 1000:1, and performing a banburying treatment at 80-82° C. for 110-120 minutes;

[0055] After kneading, the piezoelectric elastomer is cross-linked at 160-162° C. for 10-12 minutes to obtain the piezoelectric elastomer. After cross-linking, the piezoelectric elastomer has a certain strength.

[0056] 7. The embodiment of the present invention further provides a sensor module, which has the same beneficial effects as the preparation method of the above-mentioned sensor module, and will not be described in detail here.

[0057] 8. The embodiment of the present invention also provides a monitoring system, which has the same beneficial effects as the above-mentioned method for preparing a sensor module, and will not be described in detail here.

Brief Description of the Drawings

[0058] Figure 1 It is a schematic flow chart of a method for preparing a sensor module provided in the first embodiment of the present invention.

[0059] Figure 2a This is a piezoelectric response diagram of the sensor module of the present invention when it is attached to a finger.

[0060] Figure 2b This is a piezoelectric response diagram of the sensor module of the present invention attached to the elbow.

[0061] Figure 2c This is a piezoelectric response diagram of the sensor module of the present invention applied to the knee joint.

[0062] Figure 3 It is a schematic diagram of the structure of a sensor module provided by the second embodiment of the present invention.

[0063] Figure 4 yes Figure 3 Enlarged schematic diagram of some areas.

[0064] Figure 5 is a cross-sectional view of a sensor module in a sensor module according to a second embodiment of the present invention.

[0065] Figure 6 Schematic diagram of the structure of the monitoring system in the third embodiment of the present invention.

[0066] Description of the accompanying drawings:

[0067] 10. Sensor module; 20. Monitoring system;

[0068] 1. Sensor module; 2. Connecting wire; 3. Detection module;

[0069] 11. Paste layer; 12. Piezoelectric layer; 13. Signal line;

[0070] 201. Storage module; 202. Analysis module. [Specific implementation method]

[0071] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0072] In the embodiments provided by the present invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0073] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present invention.

[0074] In various embodiments of the present invention, it should be understood that the size of the serial numbers of the above-mentioned processes does not mean the necessary order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0075] The flow chart and block diagram in the accompanying drawings of the present invention illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a sequence different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which is determined based on the functions involved. It should be particularly noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs a specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0076] With the development of economy and the progress of society, people are paying more and more attention to their physical health. The rehabilitation industry is developing rapidly. New technologies such as exoskeleton robots, rehabilitation gloves, and AI rehabilitation are emerging in an endless stream. Among them, sensors for collecting rehabilitation data are the core of rehabilitation equipment. Usually, such rehabilitation sensors are used in conjunction with exoskeleton machines or some rigid mechanical structures. The overall equipment is bulky and the measurement site is relatively single, and it is impossible to collect almost complete movement data of the whole body.

[0077] When monitoring human joints, existing monitors have the problem of being bulky and heavy as a whole and not lightweight.

[0078] In order to find a way to prepare a relatively lightweight sensor that can collect full-body motion data, it is particularly important. Figure 1 The first embodiment of the present invention provides a method for preparing a sensor module, comprising the following steps:

[0079] S1, providing butanediol, lactic acid, sebacic acid and itaconic acid as raw materials;

[0080] S2, mixing and reacting the raw materials to obtain a prefabricated elastomer;

[0081] S3, dissolving the prefabricated elastomer with chlorinated hydrocarbon, and then drying and cross-linking the prefabricated elastomer to obtain a piezoelectric elastomer;

[0082] S4, providing a plurality of coating layers, dividing the piezoelectric elastic body into a plurality of piezoelectric layers corresponding to the coating layers, and disposing the piezoelectric layers in the coating layers;

[0083] S5, providing a signal line, and arranging the signal line on the coating layer to obtain a plurality of sensor modules;

[0084] S6, connecting a plurality of sensor modules in parallel to obtain a sensor module.

[0085] It can be understood that in this embodiment, butanediol, lactic acid, sebacic acid and itaconic acid are selected as raw materials, and the mixture is copolymerized to prepare the prefabricated elastomer. The prefabricated elastomer is then dissolved by chlorinated hydrocarbons, and the piezoelectric elastomer is obtained after drying and cross-linking. Specifically, lactic acid and itaconic acid can provide C=O double bonds to enhance the piezoelectric properties of the piezoelectric elastomer. In addition, the participation of lactic acid and itaconic acid in the copolymerization reaction makes the piezoelectric effect of the piezoelectric elastomer even better. It should be noted that if lactic acid is directly used for polymerization to form polylactic acid, although it has good piezoelectric properties, the modulus of its copolymer is high, and the final product prepared cannot obtain a lower elastic modulus. Further, sebacic acid and butanediol in this example can provide a long straight carbon chain, that is, a long flexible chain segment, which helps to reduce the glass transition temperature of the product to reduce the elastic modulus of the piezoelectric elastomer, so that the piezoelectric elastomer can have a good deformation ability, so that when the piezoelectric elastomer is subjected to an external force, the piezoelectric elastomer can deform in response to the force. The C=C double bond in itaconic acid can provide a curing crosslinking site for the piezoelectric elastomer during the copolymerization process, thereby making it easier to form a piezoelectric elastomer during the subsequent crosslinking treatment.

[0086] It can be understood that the piezoelectric elastomer prepared in this embodiment has a low elastic modulus and good piezoelectric performance in addition to being light in weight. The good piezoelectric performance ensures that it can respond well to deformation when it is deformed, and the low elastic modulus ensures that it has the ability to self-heal when it is deformed, that is, the piezoelectric elastomer can quickly return to the state before deformation after deformation.

[0087] Furthermore, multiple coating layers are provided, and the coating layers are specifically flexible printed circuits (FPC for short). The coating layers can be fixed on the surface of human skin by gluing or fixing with straps. Multiple coating layers can be applied to different parts of the human body, which is convenient for the sensor module to monitor multiple parts of the human body. Furthermore, since the piezoelectric elastomer is light in weight, it is not as large and heavy as the existing sensors. Therefore, the piezoelectric elastomer can be divided into multiple piezoelectric layers corresponding to the coating layer, and then the piezoelectric layer is set in the coating layer. When the coating layer is applied to the surface of the human body, once the coating layer is deformed, it will cause the piezoelectric layer to deform. After the piezoelectric deformation, a piezoelectric response can be generated, and an electrical signal is generated. Furthermore, the piezoelectric layer is electrically connected to the signal line on the coating layer, so the electrical signal can be transmitted through the signal line.

[0088] It should be understood that in this embodiment, butanediol, lactic acid, sebacic acid and itaconic acid are cleverly used as raw materials to prepare a piezoelectric elastomer that is lightweight, has a low elastic modulus and good piezoelectric properties. The sensor module in this embodiment solves the problem that the existing sensors are relatively bulky. A piezoelectric elastomer that is lightweight and has good piezoelectric properties is used as the piezoelectric layer. In the sensor module, the deformation of the piezoelectric layer is caused by the deformation of the coating layer, which can respond to generate an electrical signal. Since both the coating layer and the piezoelectric layer are relatively light, the piezoelectric module has the characteristics of being lightweight, and the piezoelectric response of the piezoelectric layer is good, so the data acquisition accuracy of the piezoelectric module is high. In addition, the piezoelectric layer has a good self-healing ability, so the service life of the piezoelectric module is long.

[0089] For example, in order to better observe the data of human joints in motion, the patch layer can be applied to the elbow, and then a strap can be wrapped around the patch layer to fix the patch layer on the elbow. When the elbow moves, part of the patch layer deforms, and the piezoelectric layer is deformed together. After the piezoelectric layer is deformed, an electrical signal is generated and transmitted to the outside through the signal line, which is simple and convenient.

[0090] Further, the molar ratio of lactic acid: butanediol: sebacic acid: itaconic acid in the preformed elastomer is in the range of (22-23): (16-17): (10-12): (2-3). It should be understood that in this embodiment, through a large number of experiments, the molar ratio of lactic acid: butanediol: sebacic acid: itaconic acid in the preformed elastomer is in the range of (22-23): (16-17): (10-12): (2-3). Optionally, the molar ratio of lactic acid: butanediol: sebacic acid: itaconic acid is 22:17:12:2. The molar ratio of lactic acid: butanediol: sebacic acid: itaconic acid is 23:17:12:3. The molar ratio of lactic acid: butanediol: sebacic acid: itaconic acid is 23:16:10:2. The molar ratio of lactic acid: butanediol: sebacic acid: itaconic acid is 23:17:12:3. Under this molar ratio, the prepared piezoelectric elastomer not only has a lower elastic modulus but also has better piezoelectric properties.

[0091] Specifically, the molar ratio of itaconic acid in the preformed elastomer accounts for 30% to 50% of the preformed elastomer. It should be understood that the molar ratio of itaconic acid in the present embodiment must be less than 50% so that the short repeating monomer does not dominate the polymer structure. Preferably, the molar ratio of itaconic acid in the preformed elastomer accounts for 40% to 50% of the preformed elastomer. It should be understood that controlling the molar ratio of itaconic acid in the preformed elastomer to 40-50% can enhance the mobility of the chain of the final copolymerization to form the preformed elastomer, promote the stacking of the chain, enhance the chain flexibility effect, while reducing the glass transition temperature (Tg) and inhibiting crystallization, optimizing the preparation process.

[0092] For example, when the molar ratio of itaconic acid in the prefabricated elastomer accounts for 40% of the prefabricated elastomer, due to the itaconic acid being at this content, the glass transition temperature of the piezoelectric elastomer prepared subsequently is less than -45°C, the crystallinity is low, and the crosslinking density is low, so that the piezoelectric elastomer has high fluidity at room temperature, which is conducive to the rapid recovery of the structure and the maintenance of the piezoelectric performance. At this time, the elastic modulus of the piezoelectric elastomer is 0.3±0.01MPa.

[0093] Further, in step S2, mixing the raw materials comprises:

[0094] S21, stirring and mixing the raw materials under a protective gas atmosphere;

[0095] S22, heating the mixture to a first temperature for a first time to react for a first time;

[0096] S23, continue heating for a second time to a second temperature for a second time,

[0097] S24, continue heating for a third time to a third temperature, and add a catalyst to carry out a reduced pressure treatment reaction for a third time to obtain a prefabricated elastomer.

[0098] Among them, the first temperature is 130℃~135℃, the second temperature is 175℃~180℃, and the third temperature is 220℃~225℃; the first time is 50~60 minutes, the second time is 110~120 minutes, and the third time is 7.9~8 hours.

[0099] Exemplarily, the protective gas may be nitrogen. It should be noted that the room temperature is 25°C. Specifically, the mixture is stirred and mixed at room temperature under a nitrogen atmosphere, and then heated to 130°C for a first time for reaction for 1 hour, and then heated to 180°C for a second time for reaction for 2 hours. Then,

[0100] A catalyst, such as tetrabutyl titanate (TBT) and a polymerization inhibitor (Tri-(4-hydroxy-TEMPO) phosphate) are added. Further, the mixture is heated to 220°C for the third time and subjected to a decompression treatment until the pressure is reduced to 300 Pa, and the reaction is continued for 8 hours to prepare a prefabricated elastomer. The tetrabutyl titanate and the polymerization inhibitor each account for 0.1% of the mass of the prefabricated elastomer.

[0101] It should be understood that the purpose of heating before adding the catalyst is that after the raw materials are mixed, the monomers in the raw materials will undergo homopolymerization, resulting in poor copolymerization effect. After the temperature increase treatment, the monomers undergoing homopolymerization can be decomposed back to the monomer state, preventing the homopolymerization from proceeding, thereby avoiding the occurrence of homopolymerization. The third temperature increase after adding the catalyst is to increase the speed of the copolymerization reaction, thereby completing the copolymerization of the raw materials as soon as possible to prepare the prefabricated elastomer.

[0102] Furthermore, the drying process specifically includes:

[0103] After adding excess methanol to the solution after the prefabricated elastomer is dissolved, the solution is allowed to stand and filtered in turn to obtain a precipitated sample, and the precipitated sample is dried at 50-60°C to obtain an amorphous elastomer. It is understandable that after the prefabricated elastomer is prepared, the prefabricated elastomer can be dissolved in a solution, wherein the solution is a chlorinated hydrocarbon solution. For example, the solution can be a dichloromethane or trichloromethane solution. It should be understood that the solution can fully dissolve the prefabricated elastomer, which is convenient for removing the raw material monomers and oligomers that are not involved in the polymerization in the prefabricated elastomer. Further, after dissolution, excess methanol can be added to the solution, and the solution is allowed to stand and precipitate first, and the precipitated sample can be obtained by filtering after precipitation. Further, the precipitated sample is dried at 50-60°C to obtain an uncrosslinked amorphous elastomer, which is simple to operate.

[0104] Further, the cross-linking treatment specifically includes:

[0105] Providing dicumyl peroxide, mixing an amorphous elastomer and dicumyl peroxide in a mass ratio of 1000:1, and performing a banburying treatment at 80-82° C. for 110-120 minutes;

[0106] After kneading, the mixture is cross-linked at 160-162° C. for 10-12 minutes to obtain a piezoelectric elastomer.

[0107] It should be understood that in order to obtain a piezoelectric elastomer, the amorphous elastomer needs to be cross-linked. For example, the amorphous elastomer and dicumyl peroxide are mixed and placed in an internal mixer, and then taken out after internal mixing at 80°C for 2 hours. Then the amorphous elastomer / dicumyl peroxide mixture is placed in a flat vulcanizer and cured at 160°C and 10 MPa for 10 minutes to form a cross-linked piezoelectric elastomer.

[0108] It can be understood that the sensor module prepared in this embodiment has a lower elastic modulus and a higher piezoelectric performance. Exemplarily, vinylidene fluoride and trifluoroethylene are selected as raw materials, and vinylidene fluoride-trifluoroethylene piezoelectric material is prepared by vinylidene fluoride and trifluoroethylene.

[0109] Experiment 1: Take out the piezoelectric layer (piezoelectric elastomer) of the sensor module, cut the piezoelectric layer and the vinylidene fluoride-trifluoroethylene piezoelectric material to form two test samples of the same size. Perform a tensile test on the two test samples.

[0110] Table 1, tensile test table

[0111]

[0112] It can be seen from Table 1 that the piezoelectric elastomer of this embodiment has a lower elastic modulus, so it can withstand a tensile deformation of up to 4.39 times after being stretched.

[0113] Experiment 2: Take out the piezoelectric layer of the sensor module, cut the piezoelectric layer and the vinylidene fluoride-trifluoroethylene piezoelectric elastomer to form two test samples of the same size. Perform a high-voltage short-circuit current density test on the two test samples.

[0114] Table 2, Piezoelectric performance test table

[0115]

[0116] It can be seen from Table 1 that the piezoelectric elastomer of this embodiment has a higher piezoelectric performance, and the high-voltage short-circuit current density it generates is 4.21 times that of the vinylidene fluoride-trifluoroethylene piezoelectric material.

[0117] Please also read Figure 2a , Figure 2a This is the piezoelectric response diagram of the sensor module attached to the finger. It can be seen that when the user's finger is not moving, the piezoelectric voltage is 2V. When the finger is bent, the piezoelectric layer in the sensor module generates a piezoelectric voltage of 2 to 5.8V.

[0118] Please also read Figure 2b , Figure 2b This is the piezoelectric response diagram of the sensor module attached to the elbow. It can be seen that when the user's elbow does not move, the piezoelectric voltage is 2V. When the elbow is bent, the piezoelectric layer in the sensor module generates a piezoelectric voltage of 2 to 5.8V.

[0119] Please also read Figure 2c , Figure 2c This is the piezoelectric response diagram of the sensor module attached to the knee joint. It can be seen that when the user's knee joint does not move, the piezoelectric voltage is 2V. When the knee joint bends, the piezoelectric layer in the sensor module generates a piezoelectric voltage of 2 to 5.8V.

[0120] Please combine Figure 3 and Figure 4The second embodiment of the present invention further provides a sensor module 10, which is prepared by the preparation method of the above-mentioned sensor module 10, and the sensor module 10 includes: a plurality of sensor modules 1, a connecting line 2 and a detection module 3; the sensor module 1 includes a coating layer 11, a piezoelectric layer 12 is arranged in the coating layer 11, and a signal line 13 electrically connected to the piezoelectric layer 12 is arranged on the coating layer 11. Specifically, the signal line 13 can be arranged outside the coating layer 11 or inside the coating layer 11, and the signal line 13 can also be at least partially accommodated in the coating layer 11, and the specific setting position of the signal line 13 is not limited. The detection module 3 is electrically connected to the signal line 13 through the connecting line 2.

[0121] Understandably, please combine Figure 5 , in order to better observe the data of human joints during movement. Multiple application layers 11 can be applied to different parts of the human body, such as elbows, fingers, necks, ankles or knees. Then wrap a strap around the outside of the application layer 11 to fix the application layer 11 on the human skin. When a person is exercising, part of the application layer 11 is deformed, and the piezoelectric layer 12 is deformed together. After the piezoelectric layer 12 is deformed, an electrical signal is generated and transmitted to the connecting line 2 through the signal line 13. The connecting line 2 further transmits the electrical signal to the detection module 3. The detection module 3 can be wirelessly connected or wired to an external device, and the electrical signal can be sent to the external device for the user to analyze the human body's movement state. Exemplarily, the detection module 3 can convert the electrical signal into a digital signal, and a Bluetooth module is provided in the detection module 3. The Bluetooth module is used to transmit the digital signal to the outside world, which is simple and convenient.

[0122] Specifically, the area of ​​the application layer 11 is larger than the area of ​​the piezoelectric layer 12. It should be understood that the application layer 11 is used to directly contact the human skin, while the piezoelectric layer 12 needs to be accurately applied to the part that the user wants to monitor. Therefore, the area of ​​the application layer 11 is larger than the area of ​​the piezoelectric layer 12, so that the application layer 11 can be stably applied to the human body.

[0123] Specifically, the sensor module 1 is any one or more combinations of a pressure sensor module 1, a velocity sensor module 1, a displacement sensor module 1 or an acceleration sensor module 1. It should be understood that the sensor module 1 can monitor different parts of the human body, so its specific detection data is varied.

[0124] For example, in one embodiment, the pressure sensor is placed at the joint (such as the elbow joint, knee joint, etc.) or the sole of the foot, because the inside of the elbow and the knee pit are places where the body is subjected to greater pressure and torsional force due to joint movement during exercise, so placing the pressure sensor here can collect information such as body joint load and movement range, and the sole of the foot is the part that supports the whole body when a person moves, so placing the pressure sensor here can perform gait detection, providing an effective basis for judging walking posture and leg diseases;

[0125] In one embodiment, the acceleration sensor is placed at the wrist or ankle to measure more accurate motion acceleration, because the wrist is located at the edge of the hand and foot, which is the part most affected by the change of acceleration during movement. Placing the sensor here can collect information such as movement speed and amplitude, and can also capture the overall dynamics of whole-body movement, including walking, running, arm swinging, etc.;

[0126] In one embodiment, the displacement sensor is placed at the connection between the pressure sensor and the acceleration sensor (such as the arm, calf, etc.), because this place is less affected by pressure and acceleration than the joints and wrists, and can more smoothly measure the six-directional movement of the object in the three-dimensional space and calculate the body movement trajectory and position change. At the same time, this place connects the joints and the wrist, which can better realize the integration of wearable devices;

[0127] In one embodiment, different sensor modules 1 can also be placed in combination on the human body surface to monitor multiple data. For example, a pressure sensor is placed on the front, back, left, and right sides of the neck, and an angular velocity sensor is placed on the back of the neck. Unlike hand and leg movements, the neck is cylindrical and will be subjected to pressure on all sides during movement. In order to better measure the deflection amplitude of the neck during movement, a flexible pressure sensor needs to be placed on all sides. At the same time, due to the limited space for neck movement, a flexible angular velocity sensor is placed separately at the cervical spine to measure the speed and deflection direction of the neck during movement, so as to realize the collection of neck rehabilitation data.

[0128] It should be understood that the sensor module 1 can be attached to the patient through its internal patch to ensure that its position is stable and fits. The sensors for measuring various parts are independent of each other and are distributed in the neck, hands, legs and feet of the human body, so that almost the whole body's sports rehabilitation data can be collected, such as the range of hand lifting and lowering, neck rotation range, leg acceleration, plantar gait detection, etc. Patients can also wear the sensors required for relevant parts according to their rehabilitation needs, without having to wear full-body equipment.

[0129] Specifically, when the patient is undergoing rehabilitation training, the sensor module 1 can accurately measure various rehabilitation data, such as pressure, acceleration, displacement, etc. Through reasonable layout and distribution, the sensor module 1 can comprehensively and accurately capture the patient's motion state and changes in body parameters, and generate the motion state and changes in body parameters into electrical signals, which are then transmitted to the detection module 3 through the connecting line 2 and converted into data by the electrical signals. The detection module 3 can be connected to an external device, so that the data on the detection module 3 can be transmitted to the external device for analysis and evaluation, providing a scientific basis and guidance for rehabilitation training.

[0130] Please combine Figure 3 and Figure 6 A monitoring system 20 is also provided in the third embodiment of the present invention, including a sensor module 10 prepared by the preparation method of the sensor module 10, a storage module 201 and an analysis module 202, and the sensor module 10 is electrically connected to the storage module 201 and the analysis module 202 respectively.

[0131] It should be understood that the sensor module 1 in the sensor module 10 can comprehensively and accurately capture the patient's movement state and body parameter changes, and generate the movement state and body parameter changes into electrical signals, which are then transmitted to the detection module 3 through the connecting line 2 and converted into data by the electrical signals. The detection module 3 can be electrically connected to the analysis module 202, so that the analysis module 202 receives the data transmitted by the detection module 3. In addition, the data can be stored in the storage module 201 for the user to continue using it next time.

[0132] The above is a detailed introduction to a preparation method of a sensor module, a sensor module and a monitoring system disclosed in an embodiment of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a sensor module, characterized in that: The following steps are involved: providing butanediol, lactic acid, sebacic acid and itaconic acid as raw materials; The raw materials are mixed and reacted to obtain a preformed elastomer; The prefabricated elastomer is dissolved by chlorinated hydrocarbon, and then dried and cross-linked to obtain the piezoelectric elastomer; Providing a plurality of coating layers, dividing the piezoelectric elastic body into a plurality of piezoelectric layers corresponding to the coating layers, and arranging the piezoelectric layers in the coating layers; Providing signal lines, and arranging the signal lines on the coating layer to obtain a plurality of sensor modules; Multiple sensor modules are connected in parallel to obtain a sensor module.

2. The method for preparing a sensor module according to claim 1, wherein: The molar ratio of lactic acid:butanediol:sebacic acid:itaconic acid in the preformed elastomer is in the range of (22-23):(16-17):(10-12):(2-3).

3. The method for preparing the sensor module according to claim 1, wherein: The molar ratio of itaconic acid in the prefabricated elastomer accounts for 30% to 50% of the prefabricated elastomer.

4. The method for preparing a sensor module according to claim 1, wherein: The raw materials are mixed and reacted including: The raw materials are stirred and mixed under a protective gas atmosphere; After mixing, heating for the first time to a first temperature and reacting for a first time; Continue heating for the second time to the second temperature and react for the second time, Continue heating for a third time to a third temperature, and add a catalyst to carry out a reduced pressure treatment reaction for a third time to obtain a prefabricated elastomer; Among them, the first temperature is 130℃~135℃, the second temperature is 175℃~180℃, and the third temperature is 220℃~225℃; The first time is 50 to 60 minutes, the second time is 110 to 120 minutes, and the third time is 7.9 to 8 hours.

5. The method for preparing a sensor module according to claim 1, wherein: Drying treatment specifically includes: Excess methanol is added to the solution after the prefabricated elastomer is dissolved, and then the solution is allowed to stand and filtered in sequence to obtain a precipitated sample, and the precipitated sample is dried at 50-60° C. to obtain an amorphous elastomer.

6. The method for preparing the sensor module according to claim 5, characterized in that: The cross-linking treatment specifically includes: Providing dicumyl peroxide, mixing an amorphous elastomer and dicumyl peroxide in a mass ratio of 1000:1, and performing a banburying treatment at 80-82° C. for 110-120 minutes; After kneading, the mixture is cross-linked at 160-162° C. for 10-12 minutes to obtain a piezoelectric elastomer.

7. A sensor module, prepared by the method for preparing a sensor module according to any one of claims 1 to 8, characterized in that: The sensor module comprises: a plurality of sensor modules, connecting wires and a detection module; The sensor module comprises a coating layer, a piezoelectric layer is arranged in the coating layer, and a signal line electrically connected to the piezoelectric layer is arranged on the coating layer; The detection module is electrically connected to the signal line through the connecting line.

8. The sensor module according to claim 7, wherein: The sensor module is any one or more combinations of a pressure sensor module, a velocity sensor module, a displacement sensor module or an acceleration sensor module.

9. The sensor module according to claim 7, wherein: The area of ​​the coating layer is larger than the area of ​​the piezoelectric layer.

10. A monitoring system, characterized in that: It comprises a sensor module, a storage module and an analysis module prepared by the preparation method of the sensor module according to any one of claims 1 to 6, wherein the sensor module is electrically connected to the storage module and the analysis module respectively.

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