CN116617001A - Novel porous breathable sandwich structure intelligent bandage with electromagnetic shielding, electric heating, impact resistance and sensing performances - Google Patents
Novel porous breathable sandwich structure intelligent bandage with electromagnetic shielding, electric heating, impact resistance and sensing performances Download PDFInfo
- Publication number
- CN116617001A CN116617001A CN202310600177.4A CN202310600177A CN116617001A CN 116617001 A CN116617001 A CN 116617001A CN 202310600177 A CN202310600177 A CN 202310600177A CN 116617001 A CN116617001 A CN 116617001A
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- CN
- China
- Prior art keywords
- polyborosiloxane
- porous
- conductive
- elastomer
- woven fabric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- A61F2013/00272—Wound bandages protection of the body or articulation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F2013/00361—Plasters
- A61F2013/00544—Plasters form or structure
- A61F2013/00604—Multilayer
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
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- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
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Abstract
The invention discloses a novel porous breathable sandwich-structured intelligent bandage with electromagnetic shielding, electric heating, impact resistance and sensing performances, which is of a sandwich structure and comprises a conductive non-woven fabric layer serving as a middle interlayer and porous polyborosiloxane elastomers arranged on the inner side and the outer side of the conductive non-woven fabric layer. The intelligent bandage integrates magnetic shielding, electric heating, impact resistance and sensing performance, can be widely applied to the fields of human health monitoring, sports protection and personal medical care, can realize monitoring of electric signals generated by human activities, has the electric heating performance, can perform hot compress to relieve muscle tension, and can provide multiple protection for human bodies.
Description
Technical Field
The invention relates to the technical field of human health monitoring and sports protection, in particular to a novel porous breathable sandwich structure intelligent bandage with electromagnetic shielding, electric heating, impact resistance and sensing performances.
Background
Sports bandages are used to prevent sports injuries from occurring and to protect joints and muscles, and play a vital role in daily life. With the development of flexible wearable intelligent bandages, the intelligent bandages with the motion monitoring function can measure electric signals generated by human activities, including joint motion monitoring, body temperature measurement and the like, and can provide new opportunities for human activity monitoring, motion protection and personal medical care.
Smart bandages with high sensitivity, wide range, fast response and recovery time have been intensively developed and widely used for monitoring physiological signals such as heart rate, respiratory activity and muscle tone. The patent with publication number CN215534394U discloses a lumbar joint activity monitoring device, which comprises a controller, two longitudinal patches and two transverse patches, and can measure the activity of actions such as lumbar forward flexion, backward extension, lateral flexion, rotation and the like.
In addition to sensitive performance, the high wearing comfort of smart bandages is also indispensable because long-term and continuous data collection is required in many practical scenarios. However, the sensing modules in most smart bandages still rely on conventional stretchable flexible substrates such as Polydimethylsiloxane (PDMS), polyester (PET), and the like. They are often bulky and sealed, which reduces the thermal wet comfort of the skin, further impeding their long-term usability. Breathable flexible sensing modules based on nanofiber membranes or textiles have been developed in order not to affect the original breathability of the bandages. Therefore, as a key research topic in the next generation of medical electronics, there is an urgent need to develop an easy method of preparing a breathable, comfortable and washable strain sensing module. The patent with publication number CN115855323A discloses a high-performance waterproof breathable full-flexible piezoelectric touch intelligent bandage which is used for preparing intelligent skin, has high pressure sensing sensitivity and does not generate discomfort after being contacted with human skin for a long time.
In addition, the functions of multiple protection, multifunctional sensing, multi-mode sensing, diagnosis and treatment combination and the like are combined with the bandage, so that the application scene can be widened, the intelligent bandage is more portable and combined to be functionalized, and new opportunities for human activity monitoring and personal medical care can be provided. The patent with the publication number of CN215385074U provides a multifunctional vest integrating cooling, heart rate and body temperature monitoring and protection, which has the advantages of low cost, strong usability, high reliability and light structure, effectively integrates the prior art, is easy to use and comfortable, and can be more suitable for field training.
From the presently disclosed patent, intelligent bandages with motion monitoring function have high potential in human health monitoring. But the development of novel intelligent bandages which simultaneously meet the requirements of intellectualization, comfort, multifunction and protection is very little. Obviously, the novel porous breathable sandwich-structured intelligent bandage with electromagnetic shielding, electric heating, impact resistance and sensing performances has a very high application prospect in actual human health detection and medical care.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a novel porous breathable sandwich structure intelligent bandage and a preparation method thereof.
Specifically, the invention is realized by the following technical scheme:
the utility model provides a novel porous ventilative sandwich structure intelligent bandage with electromagnetic shield, electrical heating, shock resistance and sensing performance, intelligent bandage is sandwich structure, is including as the conductive non-woven fabrics layer of intermediate layer and setting are in the porous polyborosiloxane elastomer of conductive non-woven fabrics in-situ and outside both sides. The conductive non-woven fabric layer is used as a conductive function interlayer and has electromagnetic shielding, electric heating and sensing performances; the porous polyborosiloxane elastomer is an inner layer and an outer layer with a protective function, and can resist external impact; silver paste and copper foil are used as electrodes, so that the electrode is soft, skin friendly and comfortable; the three layers of the sandwich structure intelligent bandage are all flexible porous materials, breathable and conformal.
Further: the conductive nonwoven fabric is formed with a conductive layer on the surface of the nonwoven fabric by dipping in a conductive material solution and drying. The non-woven fabrics are common non-woven fabrics, including but not limited to TPU non-woven fabrics, PU non-woven fabrics, terylene non-woven fabrics and PE non-woven fabrics, and are subjected to ethanol ultrasonic treatment to remove surface oil stains and impurities. The conductive materials are MXene and AgNWs, and the nanoscale conductive material has large specific surface area and high conductivity.
Further: the conductive layer was formed on the surface of the nonwoven fabric by alternately immersing the AgNWs solution and the MXene solution and drying. The structure of AgNWs intercalated MXene reduces the MXene layer-to-layer contact resistance to improve the conductivity of the conductive fabric. The times of impregnation are 1-9 times; the AgNWs solution and the MXene impregnation sequence include, but are not limited to, one AgNWs followed by MXene, one MXene followed by AgNWs, two AgNWs followed by MXene, two MXene followed by AgNWs, … …, and so on; the drying temperature is 40-90 ℃.
Further: the porous polyborosiloxane elastomer is formed by vulcanizing polyborosiloxane and methyl vinyl silicone rubber in a hot press by taking benzoyl peroxide as a cross-linking agent. The polyborosiloxane resists external impact due to the rate-related effect, and the methyl vinyl silicone rubber has good shape retention after vulcanization, and the polyborosiloxane elastomer has stable shape and impact resistance after the polyborosiloxane elastomer and the methyl vinyl silicone rubber are mixed. Preferably, the mass ratio of the polyborosiloxane to the methyl vinyl silicone rubber is 30% -70%: 70% -30%; preferably, the amount of the cross-linking agent is 4-10% of the total mass of the polyborosiloxane and the methyl vinyl silicone rubber; preferably, the hot pressing temperature of the vulcanization is 90-100 ℃, the vulcanization pressure is 9-20kPa, and the vulcanization time is 9-15min.
Further: the thickness of the porous polyborosiloxane elastomer is 0.5-2mm, the porous polyborosiloxane elastomer is provided with a hole array, the aperture is 0.01-1mm, and the distance between two hole centers is 0.02-2mm. The hole arrangement forms include, but are not limited to, square, trapezoid, triangle, circle, etc. The drilling mode of the porous polyborosiloxane elastomer comprises, but is not limited to, mechanical drilling, laser etching and the like, and the drilling method is simple and efficient, and the prepared holes are uniform in distribution and good in air permeability.
Further: the polyborosiloxane is formed by crosslinking silicone oil and boric acid at 160-200 ℃ according to the mass ratio of 20-30:1.
The invention also provides a preparation method of the porous breathable sandwich structure intelligent bandage, which comprises the following steps:
step 1, preparation of a porous polyborosiloxane elastomer
Uniformly mixing silicone oil and boric acid in a mass ratio of 20-30:1, then placing the mixture into an oven, performing heat treatment at 160-200 ℃ until the system is solid, adding n-octanoic acid, and continuing to react for 20-30 min to obtain polyborosiloxane;
the mass ratio is 30% -70%: uniformly mixing 70% -30% of polyborosiloxane and methyl vinyl silicone rubber with benzoyl peroxide which is a vulcanizing agent and accounts for 4% -10% of the total mass of the polyborosiloxane and the methyl vinyl silicone rubber through a rubber mixing mill, filling the mixture into a die with the inner layer thickness of 0.5-2mm, then placing the die into a hot press, setting the hot press temperature to be 90-100 ℃, setting the vulcanizing pressure to be 9-20kPa, and setting the vulcanizing time to be 9-15min, thus obtaining the polyborosiloxane elastomer;
making the polyborosiloxane elastomer into a hole array with the aperture size of 0.01-1mm by using a silica gel puncher or a laser etching machine, wherein the distance between the centers of two holes is 0.02-2mm, and thus obtaining the porous polyborosiloxane elastomer;
step 2, preparation of the conductive non-woven fabric layer
Removing impurities and greasy dirt on the surface of the non-woven fabric by ethanol ultrasonic treatment, and then alternately dipping AgNWs solution and MXene solution and drying at 40-90 ℃ to obtain a conductive non-woven fabric layer;
setting up an electrode on the surface of the conductive non-woven fabric through silver paste and copper foil to form a conductive path;
step 3, preparation of intelligent bandage
And adhering the conductive non-woven fabric layer between two layers of porous polyborosiloxane elastomers by using the adhesiveness of the porous polyborosiloxane elastomers to obtain the porous breathable intelligent bandage with the sandwich structure.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention designs the novel porous breathable sandwich-structured intelligent bandage, integrates magnetic shielding, electric heating, impact resistance and sensing performance, can be widely applied to the fields of human health monitoring, sports protection and personal medical care, can realize monitoring of electric signals generated by human activities, has electric heating performance, can perform hot compress to relieve muscle tension, and simultaneously can provide multiple protection for human bodies.
(2) The invention designs a conductive fabric with electromagnetic shielding, electric heating and sensing performances by adopting a preparation mode of alternately impregnating MXene and AgNWs conductive materials on the surface of non-woven fabric fibers.
(3) According to the invention, the porous polyborosiloxane elastomer is drilled by adopting mechanical drilling or laser etching and other modes, the drilling method is simple and efficient, the holes are uniformly distributed, and the porous polyborosiloxane elastomer can resist external impact while meeting the air permeability.
Drawings
Fig. 1 is an optical photograph of an intelligent bandage with a porous and breathable sandwich structure (fig. 1 (a)) and an optical photograph of the intelligent bandage attached and torn off on human skin (fig. 1 (b) and (c)).
Fig. 2 is an optical microscope photograph of a porous polyborosiloxane elastomer.
FIG. 3 is a comparison of the appearance of a polyborosiloxane elastomer and polyborosiloxane for 4 weeks.
Fig. 4 is a graph of the rheological properties of a polyborosiloxane elastomer.
Fig. 5 shows the electrical conductivity of the conductive nonwoven with different alternating impregnation sequences.
Fig. 6 shows the electromagnetic shielding properties of the conductive nonwoven fabrics with different alternating impregnation sequences.
FIG. 7 shows the electrothermal properties of a porous breathable sandwich structured smart bandage.
FIG. 8 shows drop impact resistance of a porous breathable sandwich structured smart bandage and a conductive nonwoven.
Fig. 9 shows the water vapor permeability of the porous breathable sandwich structured smart bandage and the conductive nonwoven fabric.
FIG. 10 is a plot of the sensitivity of a porous breathable sandwich structured smart bandage.
FIG. 11 shows the sensing performance of a porous breathable sandwich structured smart bandage at 5%, 15%, 25%, 30% tensile strain.
FIG. 12 shows the sensing performance of the porous breathable sandwich structured smart bandage at tensile frequencies of 0.5Hz, 1Hz, 1.5Hz, and 2 Hz.
FIG. 13 is a schematic structural view of the porous breathable sandwich structured intelligent bandage of the present invention.
FIG. 14 is a flow chart showing the implementation of the preparation method of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. The following is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar thereto, by those skilled in the art, without departing from the principles of the invention or beyond the scope of the appended claims.
The samples prepared in the following examples were tested for performance parameters according to the following test methods, wherein the conductive nonwoven layers for the intelligent bandages were MA 1/1 ：
A. The specific mode for measuring the electrical characteristics of the conductive non-woven fabric layer in the porous breathable sandwich structure intelligent bandage is as follows:
the conductive nonwoven was connected with a copper foil as an electrode using silver paste, and electrical properties were measured using an impedance meter test system (Solartron Analytical, AMETEK Advanced Measurement Technology, inc.).
B. The specific way to measure the rheological properties of the polyborosiloxane elastomer is as follows:
the polyborosiloxane elastomer was formed into a film 1mm thick and 20mm in diameter using a die and then characterized for its shear hardening properties using a commercial rheometer (Physica MCR 302,Anton Paar Co, austria).
C. The specific mode for measuring the electric heating performance of the porous breathable sandwich structure intelligent bandage is as follows:
the samples were placed on a printed sample holder and temperature signals were collected using an automatic range DC power supply (IT 8500, edex electronics Inc.) and thermocouple (DT-3891G, shenzhen Co., ltd.).
D. The specific mode for measuring the protective performance of the porous breathable sandwich structure intelligent bandage under low-speed impact is as follows:
the sample was placed on a force sensor (KD 3005C, dulcimer, kov) and a 0.55kg hammer head was released from different heights using a drop hammer impact device (ZCJ 1302-a, meitesi industry) and after the sample was impacted, the force sensor amplified the signal by a charge amplifier (YE 5853, eastern test) and finally data was collected by a digital oscilloscope (Tektronix DPO 2014B).
E. The specific mode for measuring the electromagnetic shielding performance of the novel porous breathable sandwich structure intelligent bandage is as follows:
the samples were cut to 3 x 3cm size, loaded into a vector network analyzer (AV 3672, chinese electronic technology instruments, inc.) and tested for electromagnetic interference shielding performance in the 8-12GHz region (x-band).
F. The specific mode for measuring the water vapor permeability of the novel porous breathable sandwich structure intelligent bandage is as follows:
the sample was cut to a size of 2 x 2cm, covered on a mouth of a glass bottle (capacity 10 mL) filled with 10mL of water, a contact portion of the bottle with the sample was fastened with a rubber band, and an edge portion was sealed with paraffin to prevent air leakage. The device is placed in a constant temperature oven at 30 ℃, the weight of the whole device is weighed every day, and the weight reduction is the weight of water vapor evaporation.
G. The specific mode for measuring the sensing performance (including sensitivity, different strain stability and different frequency stability) of the novel porous breathable sandwich structure intelligent bandage is as follows:
the tensile sensing uses a 1.5cm by 3cm sample, the sensing test is controlled by a dynamic mechanical analyzer (DMA 3200), strain and frequency are recorded at two ends of the tensile sample by a chuck of the dynamic mechanical analyzer, and resistance signals are collected by an impedance tester (ModuLab XM MTS) in real time.
Example 1
The porous breathable sandwich-structured intelligent bandage is prepared according to the following steps:
step 1, preparation of a porous polyborosiloxane elastomer
Uniformly mixing silicone oil and boric acid in a mass ratio of 30:1, then placing the mixture into an oven for heat treatment at 180 ℃ until the system is solid, then adding n-octanoic acid (silicone oil: n-octanoic acid=100 g:250 mu L) and continuing to react for 30min to obtain the polyborosiloxane. The mass ratio is 30 percent: mixing 70% of polyborosiloxane and methyl vinyl silicone rubber with benzoyl peroxide which is a vulcanizing agent accounting for 4% of the total mass of the polyborosiloxane and the methyl vinyl silicone rubber uniformly by a rubber mixing machine, filling the mixture into a die with the inner layer thickness of 0.5mm, and then placing the die into a hot press, wherein the hot press temperature is set to 90 ℃, the vulcanizing pressure is set to 18kPa, and the vulcanizing time is set to 15 minutes, so that the polyborosiloxane elastomer is obtained.
And engraving a positioning template (the hollow circle d=1 mm, the distance between the centers of two adjacent circles is 3 mm) on the PET film by using a laser engraving machine, then adhering the polyborosiloxane elastomer film on the perforated PET film, and finally stamping holes from the polyborosiloxane elastomer direction to the PET direction by using a silica gel punching machine to obtain the porous polyborosiloxane elastomer.
Step 2, the MXene/AgNWs alternately impregnates the non-woven fabrics to prepare the conductive non-woven fabrics layer
Alternate leaching of MXene solution and AgNWs solution: firstly, immersing non-woven fabrics with ethanol ultrasonic to wash out impurities in an MXene solution with the concentration of 5mg/mL for 5s, and drying at 90 ℃ in an oven; then immersing in AgNWs solution with the concentration of 5mg/mL for 5s, and drying in an oven at 90 ℃.
The steps of the above-mentioned "alternate impregnation with MXene solution and AgNWs solution" were repeated a total of 4 times to obtain an alternate impregnation conductive nonwoven fabric layer of MXene and AgNWs (designated MA 1/1 )。
And constructing an electrode on the surface of the conductive non-woven fabric through silver paste and copper foil to form a conductive path.
Step 3, preparation of intelligent bandage
A conductive nonwoven layer is placed between two layers of porous polyborosiloxane elastomer. The sizes of the upper and lower porous polyborosiloxane elastomers are slightly larger than those of the conductive non-woven fabric layers, and the conductive non-woven fabric layers can be successfully wrapped in the middle due to the viscosity of the porous polyborosiloxane elastomer polymers, so that the porous breathable intelligent bandage with the sandwich structure is manufactured.
Example 2
The porous breathable sandwich-structured intelligent bandage is prepared according to the following steps:
step 1, preparation of a porous polyborosiloxane elastomer
The same as in example 1.
Step 2, the MXene/AgNWs alternately impregnates the non-woven fabrics to prepare the conductive non-woven fabrics layer
Alternate dips 2 MXene and 1 AgNWs: firstly, immersing non-woven fabrics with ethanol ultrasonic to wash out impurities in an MXene solution with the concentration of 5mg/mL for 5s, and drying at 90 ℃ in an oven; immersing the mixture into an MXene solution with the concentration of 5mg/mL for 5s, and drying the mixture in an oven at 90 ℃; then immersing in AgNWs solution with the concentration of 5mg/mL for 5s, and drying in an oven at 90 ℃.
The steps of the above-mentioned "alternate impregnation with MXene and 1 AgNWs" were repeated 3 times in total to obtain an alternate impregnation conductive nonwoven fabric layer (named MA 2/1) 。
And constructing an electrode on the surface of the conductive non-woven fabric through silver paste and copper foil to form a conductive path.
Step 3, preparation of intelligent bandage
The same as in example 1.
Example 3
The porous breathable sandwich-structured intelligent bandage is prepared according to the following steps:
step 1, preparation of a porous polyborosiloxane elastomer
The same as in example 1.
Step 2, the MXene/AgNWs alternately impregnates the non-woven fabrics to prepare the conductive non-woven fabrics layer
Alternate dips 1 MXene and 2 AgNWs: firstly, immersing non-woven fabrics with ethanol ultrasonic to wash out impurities in an MXene solution with the concentration of 5mg/mL for 5s, and drying at 90 ℃ in an oven; then immersing in AgNWs solution with the concentration of 5mg/mL for 5s, and drying in an oven at 90 ℃; immersing the mixture into AgNWs solution with the concentration of 5mg/mL for 5s, and drying the mixture in an oven at 90 ℃.
The steps of the above-mentioned "alternate impregnation with MXene and 2 AgNWs" were repeated 3 times in total to obtain an alternate impregnation conductive nonwoven fabric layer (named MA 1/2 )。
And constructing an electrode on the surface of the conductive non-woven fabric through silver paste and copper foil to form a conductive path.
Step 3, preparation of intelligent bandage
The same as in example 1.
The conductivities of the conductive non-woven fabric layers in the porous breathable sandwich-structured intelligent bandages prepared in examples 1-3 were tested respectively, and the test results were as follows according to the "A, the specific mode for measuring the electrical properties of the intelligent bandages" in the foregoing test methods:
| sequence of alternate impregnation of AgNWs and MXene | MA 1/1 | MA 2/1 | MA 1/2 |
| Conductivity (S/mm) 2 ) | 7.66 | 3.77 | 6.57 |
FIG. 1 is an optical photograph of a porous breathable sandwich structured smart bandage, illustrating its porous breathability, softness, skin-friendliness, adhesion and conformability. The polyborosiloxane elastomer is made of transparent silica gel, and the conductive non-woven fabric is black.
Fig. 2 is an optical microscope image of a porous polyborosiloxane elastomer illustrating that the porous polyborosiloxane elastomer obtained by mechanical drilling has flat hole cuts and regular hole arrangement.
FIG. 3 is a comparative view of the appearance of a polyborosiloxane elastomer and polyborosiloxane for 4 weeks, illustrating that polyborosiloxane elastomers have better shape retention than polyborosiloxanes and cold flow occurs upon placement.
Fig. 4 is a graph of the rheological properties of a polyborosiloxane elastomer illustrating that the polyborosiloxane elastomer has shear hardening rate related characteristics that allow force protection.
FIG. 5 shows the conductivities of the conductive nonwovens in different alternate impregnation sequences, illustrating that alternate impregnation of MXene and AgNWs can achieve higher conductivities for the smart bandages, which is beneficial to achieving electrothermal performance and electromagnetic shielding performance for the smart bandages.
Fig. 6 shows the electromagnetic shielding properties of the conductive nonwoven fabrics with different alternating impregnation sequences, illustrating that alternating impregnation of MXene and AgNWs can achieve a high electromagnetic shielding effect for the smart bandage.
FIG. 7 shows the electrothermal properties of a porous breathable sandwich structured smart bandage, illustrating that alternate impregnation of MXene and AgNWs can achieve a high electrothermal effect for the smart bandage.
FIG. 8 is a drop impact resistance of a porous breathable sandwich structured smart bandage and a conductive nonwoven fabric, illustrating that a porous polyborosiloxane elastomer may provide the smart bandage with force protection.
Fig. 9 is a graph showing the vapor transmission performance of the porous breathable sandwich structured smart bandage and the conductive nonwoven fabric, showing that the smart bandage is porous and breathable, and has good thermal and wet comfort during the wearing process.
FIG. 10 is a graph showing the sensing sensitivity of a porous breathable sandwich structured smart bandage, illustrating that alternate impregnation of MXene and AgNWs can result in a smart bandage that achieves high sensitivity.
FIG. 11 shows the sensing performance of a porous breathable sandwich structured smart bandage at 5%, 15%, 25%, 30% tensile strain, demonstrating that alternate impregnation of MXene and AgNWs can result in a smart bandage with high sensing stability.
FIG. 12 shows the sensing performance of the porous breathable sandwich structured smart bandage at tensile frequencies of 0.5Hz, 1Hz, 1.5Hz, and 2Hz, demonstrating that alternate impregnation of MXene and AgNWs can result in a high sensing stability of the smart bandage.
FIG. 13 is a schematic structural view of an intelligent bandage with a porous and breathable sandwich structure, specifically, a conductive fabric sandwich is encapsulated by two layers of porous polyborosiloxane elastomer, the top layer and the bottom layer are porous polyborosiloxane elastomer from a side view, and the inner layer is a conductive fabric; the pores of the top layer porous polyborosiloxane elastomer are ordered from a top view.
Fig. 14 is a flow chart of the implementation of the preparation method of the present invention: on the one hand, immersing the non-woven fabric in an MXene solution, and drying; soaking in AgNWs solution, and oven drying. Repeating the steps to obtain the conductive non-woven fabric. On the other hand, the polyborosiloxane and the methyl vinyl silicone rubber are mixed and vulcanized to obtain the polyborosiloxane elastomer, and then the porous polyborosiloxane elastomer with orderly arranged holes is obtained by adopting a mechanical drilling method. And finally, compounding the porous polyborosiloxane elastomer with the conductive fabric, and preparing the porous breathable intelligent bandage with the sandwich structure by utilizing the self adhesion of the porous polyborosiloxane elastomer.
Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (9)
1. Novel porous ventilative sandwich structure intelligent bandage with electromagnetic shield, electrical heating, shock resistance and sensing performance, its characterized in that: the intelligent bandage is of a sandwich structure and comprises a conductive non-woven fabric layer serving as a middle interlayer and porous polyborosiloxane elastomers arranged on the inner side and the outer side of the conductive non-woven fabric layer.
2. The intelligent bandage according to claim 1, characterized in that: the conductive nonwoven fabric is formed with a conductive layer on the surface of the nonwoven fabric by dipping in a conductive material solution and drying.
3. The intelligent bandage according to claim 2, characterized in that: the conductive materials are MXene and AgNWs.
4. A smart bandage according to claim 3, characterized in that: the conductive layer was formed on the surface of the nonwoven fabric by alternately immersing the AgNWs solution and the MXene solution and drying.
5. The intelligent bandage according to claim 1, characterized in that: the porous polyborosiloxane elastomer is formed by vulcanizing polyborosiloxane and methyl vinyl silicone rubber in a hot press by taking benzoyl peroxide as a cross-linking agent; the mass ratio of the polyborosiloxane to the methyl vinyl silicone rubber is 30% -70%: 70% -30%; the dosage of the cross-linking agent is 4-10% of the total mass of the polyborosiloxane and the methyl vinyl silicone rubber; the hot pressing temperature of the vulcanization is 90-100 ℃, the vulcanization pressure is 9-20kPa, and the vulcanization time is 9-15min.
6. The intelligent bandage according to claim 1 or 5, characterized in that: the thickness of the porous polyborosiloxane elastomer is 0.5-2mm, the porous polyborosiloxane elastomer is provided with a hole array, the aperture is 0.01-1mm, and the distance between two hole centers is 0.02-2mm.
7. The intelligent bandage according to claim 5, wherein: the polyborosiloxane is formed by crosslinking silicone oil and boric acid at 160-200 ℃ according to the mass ratio of 20-30:1.
8. The intelligent bandage according to claim 2, characterized in that: and an electrode is built on the surface of the conductive non-woven fabric through silver paste and copper foil to form a conductive path.
9. A method for preparing an intelligent bandage with a porous and breathable sandwich structure according to any one of claims 1-8, comprising the steps of:
step 1, preparation of a porous polyborosiloxane elastomer
Uniformly mixing silicone oil and boric acid in a mass ratio of 20-30:1, putting the mixture into an oven, performing heat treatment at 160-200 ℃ until the system is solid, then adding n-octanoic acid, and continuing to react for 20-30 min to obtain polyborosiloxane;
the mass ratio is 30% -70%: uniformly mixing 70% -30% of polyborosiloxane and methyl vinyl silicone rubber with benzoyl peroxide which is a vulcanizing agent and accounts for 4% -10% of the total mass of the polyborosiloxane and the methyl vinyl silicone rubber through a rubber mixing mill, filling the mixture into a die with the inner layer thickness of 0.5-2mm, then placing the die into a hot press, setting the hot press temperature to be 90-100 ℃, setting the vulcanizing pressure to be 9-20kPa, and setting the vulcanizing time to be 9-15min, thus obtaining the polyborosiloxane elastomer;
making the polyborosiloxane elastomer into a hole array with the aperture size of 0.01-1mm by using a silica gel puncher or a laser etching machine, wherein the distance between the centers of two holes is 0.02-2mm, and thus obtaining the porous polyborosiloxane elastomer;
step 2, preparation of the conductive non-woven fabric layer
Removing impurities and greasy dirt on the surface of the non-woven fabric by ethanol ultrasonic treatment, and then alternately dipping AgNWs solution and MXene solution and drying at 40-90 ℃ to obtain a conductive non-woven fabric layer;
setting up an electrode on the surface of the conductive non-woven fabric layer through silver paste and copper foil to form a conductive path;
step 3, preparation of intelligent bandage
And adhering the conductive non-woven fabric layer between two layers of porous polyborosiloxane elastomers by using the adhesiveness of the porous polyborosiloxane elastomers to obtain the porous breathable intelligent bandage with the sandwich structure.
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