Mask type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities

Abstract

The invention discloses a mask type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities. The mask type temperature sensor comprises a temperature sensor main body which is composed of four parts including an antibacterial non-woven film substrate, a temperature sensing unit, an electrode and a packaging layer; the temperature sensing unit is fixed on the surface of the antibacterial non-woven film; the electrodes are respectively compounded on the upper and lower sides of the temperature sensitive unit; the packaging layer is located on the outermost side of the sensor body and completely wraps the antibacterial non-woven film substrate, the temperature sensing unit and the electrodes. The nose clip is fixed to the outer side of the packaging layer and used for enabling the mask to be tightly attached to the face; the mask belts are arranged on the two sides of the packaging layer and used for fixing the mask to the ears of the user. The mask type temperature sensor can generate active oxygen under natural illumination, and has a broad-spectrum killing effect on bacteria in contact with the mask; in the wearing process, the user breathes to change the temperature of the mask, so that the resistance of the temperature sensing unit is changed, and the breathing monitoring purpose can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of flexible electronic devices, and in particular relates to a mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities. Background Art

[0002] Temperature sensors based on negative temperature coefficient thermistors have the advantages of short response / recovery time and high sensitivity. They have been widely used in smart homes, industrial Internet, new energy and other fields. Their main working principle relies on the special temperature sensitivity of semiconductors: when the ambient temperature changes, the number of carriers in semiconductor materials increases, resulting in a decrease in resistance. If smart masks can be prepared based on negative temperature coefficient thermistors, they can capture the slight temperature changes produced during breathing with their high sensitivity, thereby achieving the purpose of health detection.

[0003] However, masks have extremely high requirements for breathability and antibacterial properties. In order to ensure breathability, current commercial masks are usually composed of a three-layer stacked structure of spunbond fabric-meltblown fabric-spunbond fabric, in which each layer of material has an extremely high porosity. In order to ensure antibacterial properties, masks are usually treated with electrets during production so that their surfaces carry a charge for a long time, which plays a bactericidal role. If a negative temperature coefficient thermistor is directly integrated into a commercial mask, its breathability will inevitably be affected. If any layer of the spunbond fabric and the meltblown fabric is removed in order to maintain breathability, its antibacterial properties will be affected.

[0004] Therefore, how to achieve the temperature sensing performance of the mask without affecting its breathability and antibacterial properties remains a challenge so far. Summary of the invention

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities; without sacrificing the breathability and antibacterial properties of the mask, the temperature changes caused by the user's breathing are monitored in real time through negative temperature coefficient thermistor materials, thereby helping to understand the user's physiological information.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities, comprising: a temperature sensor body, a nose clip, and a mask strap; the temperature sensor body is composed of four parts, including an antibacterial non-woven membrane substrate, a temperature sensitive unit, an electrode, and a packaging layer; the nose clip is fixed to the outside of the packaging layer; the mask strap is arranged on both sides of the packaging layer.

[0007] Furthermore, in the temperature sensor body, there are two electrodes, which are respectively compounded on both sides of the temperature sensitive unit; the temperature sensitive unit compounded with the electrode is fixed on the surface of one side of the antibacterial non-woven membrane substrate; the encapsulation layer is located on the outermost side of the temperature sensor body, and completely covers the antibacterial non-woven membrane substrate, the temperature sensitive unit and the electrode.

[0008] Furthermore, the electrode and the temperature sensitive unit partially overlap; one side of the electrode close to the antibacterial non-woven membrane substrate is in close contact with the antibacterial non-woven membrane substrate; The temperature sensitive unit after being combined with the electrode is fixed to the surface of one side of the antibacterial non-woven membrane substrate (11) and arranged in the middle thereof.

[0009] Furthermore, the nose clip is fixed to the outside of the packaging layer to make the mask fit closely to the face.

[0010] Furthermore, the mask straps are arranged on both sides of the packaging layer to fix the mask on the ears of the user.

[0011] Furthermore, the porosity of the antibacterial nonwoven membrane substrate is greater than 30% and is adjustable, and the material used to prepare the antibacterial nonwoven membrane substrate is a polymer with porphyrin side chains; further, the polymer structure in the polymer with porphyrin groups can be any one of polyurethane and polymethyl methacrylate.

[0012] According to an embodiment of the present invention, the antibacterial non-woven membrane substrate is prepared by electrospinning porphyrin-grafted polymethyl methacrylate, and the electrospinning conditions are as follows: the spinning solution solute is porphyrin-grafted polymethyl methacrylate, the spinning solution solvent is tetrahydrofuran, the spinning solution concentration is 30%, the spinning voltage is 16 kV, the injection rate is 1 ml / h, and the collection distance is 20 cm.

[0013] According to an embodiment of the present invention, the size of the antibacterial non-woven membrane substrate is a rectangle of 15 cm×8 cm.

[0014] Furthermore, the temperature sensitive unit is fixed on the surface of the antibacterial non-woven membrane, and the material used to prepare the temperature sensitive unit is a polymer doped with a negative temperature coefficient metal oxide; The negative temperature coefficient metal oxide may be one or more of nickel oxide, copper oxide, zinc oxide, manganese oxide, cobalt oxide, and iron oxide; The polymer structure may be any one of polyurethane, polymethyl methacrylate, polyimide, and polydimethylsiloxane.

[0015] The mass ratio of the negative temperature coefficient metal oxide to the polymer may be 1:1-4:1, specifically 2:1.

[0016] According to an embodiment of the present invention, the size of the temperature sensitive unit is: 1 cm×1 cm square, 50 μm thick; the temperature sensitive unit is made of nickel oxide-doped polyimide, and the mass ratio of nickel oxide to polyimide is 2:1.

[0017] Furthermore, the electrodes are respectively compounded on both sides of the temperature sensitive unit, and the material for preparing the electrodes can be a polymer doped with nanosilver; The nanosilver may be one or more of silver nanoparticles, silver nanosheets, and silver nanowires; The polymer may be any one of polyurethane, polymethyl methacrylate, styrene-butadiene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, and epoxy resin; The mass ratio of the nanosilver to the polymer may be 2:1-10:1, specifically 3:1.

[0018] According to an embodiment of the present invention, the electrode has a size of 0.5 cm×3 cm in a rectangle and is composed of styrene-butadiene-styrene block copolymer doped with silver nanoparticles; the mass ratio of the silver nanoparticles to the styrene-butadiene-styrene block copolymer is 3:1.

[0019] Furthermore, the encapsulation layer is a translucent non-woven film, which is located on the outermost side of the sensor body and completely covers the antibacterial non-woven film substrate, the temperature sensitive unit and the electrode. The material for preparing the encapsulation layer can be any one of polyurethane, polymethyl methacrylate, styrene-butadiene-styrene block copolymer, and styrene-ethylene-butylene-styrene block copolymer.

[0020] The encapsulation layer has a visible light transmittance of greater than 10% in the 540nm band.

[0021] According to an embodiment of the present invention, the encapsulation layer is prepared by electrospinning polyurethane, and the electrospinning conditions are as follows: the spinning solution solvent is tetrahydrofuran, the spinning solution concentration is 25%, the spinning voltage is 18kV, the injection rate is 1ml / h, and the collection distance is 20cm. By controlling the spinning time, the thickness of the encapsulation layer can be adjusted, thereby adjusting its transmittance that can be monitored in the 540nm band. If the spinning time is 1h, the transmittance of the encapsulation layer can reach 32%.

[0022] Furthermore, the nose clip is fixed to the outside of the packaging layer and has ductility. The material for preparing the nose clip can be any one of aluminum alloy, polypropylene, polyethylene terephthalate, and polyurethane.

[0023] Furthermore, the mask strap is arranged on both sides of the encapsulation layer, and the material for preparing the mask strap can be any one of spandex, polyester, styrene-butadiene-styrene block copolymer, and styrene-ethylene-butylene-styrene block copolymer.

[0024] When using the above-mentioned mask-type temperature sensor for respiratory monitoring, you need to first wear the sensor on your face in the form of a mask, fix the mask strap behind your ears, and press the nose clip to make the mask fit tightly to your face. Use leads to connect the two electrodes to the positive and negative electrodes of the resistance testing device. During the user's breathing, the temperature of the mask changes with the exhaled gas, causing the resistance of the thermistor in the equivalent circuit to change. The relationship between its resistance and temperature can be described by the following formula:

[0025] Among them, R t is the resistance value at temperature T, R n T n The nominal resistance at the temperature, B is the temperature coefficient. The temperature coefficient and nominal resistance are obtained by calibration before the device is used. t By using the frequency and amplitude of numerical changes in the data, we can calculate the user’s breathing temperature, breathing frequency and other information.

[0026] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities, which realizes high-sensitivity temperature detection by built-in negative temperature coefficient metal oxide semiconductor, so as to detect the slight temperature change caused by breathing during the user's wearing process. Based on the porphyrin-modified polymer to construct a non-woven membrane, as a temperature-sensitive unit substrate, and replace the melt-blown layer in the traditional mask, it can be ensured that the mask has excellent antibacterial properties. By regulating the preparation conditions of the non-woven membrane substrate, its porosity can be regulated to ensure the air permeability of the mask. Finally, combining the above strategies, a smart mask with air permeability, antibacterial properties and respiratory monitoring functions can be realized. When the user wearing the mask exhales, the temperature in the mask rises slightly, resulting in a significant increase in the carrier concentration of the negative temperature coefficient metal oxide semiconductor, thereby reducing its resistance. When the user's health and exercise conditions change, the temperature change amplitude and period generated by breathing change accordingly, thereby changing the resistance signal, so that the purposes of exercise monitoring and health detection can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the figures required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 A schematic diagram of the synthesis of a polymer with a porphyrin side chain, which is a base material of a mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities proposed by the present invention; Figure 2 This is a structural schematic diagram of a mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities proposed by the present invention; wherein, 1, temperature sensor body; 2, nose clip; 3, mask strap; 11, antibacterial non-woven membrane substrate; 12, temperature sensitive unit; 13, electrode; 14, packaging layer; Figure 3 The signal changes of a mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities proposed by the present invention when worn at rest and after strenuous exercise; Figure 4 The signal change of a mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities proposed by the present invention when worn on the face of a user with fever; Figure 5 This is a schematic diagram comparing the antibacterial performance of a mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities under natural light proposed by the present invention. DETAILED DESCRIPTION

[0029] Here, exemplary embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application.

[0030] It should be understood that the present invention can be implemented in many different forms and should not be considered to be limited to the embodiments described herein. On the contrary, these embodiments are provided to make the present invention transparent and complete, and will fully convey the scope of the present invention to those skilled in the art. In addition, the technical features involved in each embodiment described below can be combined with each other as long as they do not conflict with each other.

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] The porphyrin-grafted polymethyl methacrylate used in the following examples can be prepared according to Figure 1 The prepared porphyrin-grafted polymethyl methacrylate has a molecular weight greater than or equal to 10w.

[0033] The present invention discloses a mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities, and its structural schematic diagram is shown in FIG. Figure 1 , including: a temperature sensor body 1, the temperature sensor body is composed of four parts, including an antibacterial non-woven membrane substrate 11, a temperature sensitive unit 12, two electrodes 13, and a packaging layer 14; the temperature sensitive unit 12 is fixed on the surface of the antibacterial non-woven membrane 11; the electrodes 13 are respectively compounded on the upper and lower sides of the temperature sensitive unit 12; the packaging layer 14 is located at the outermost side of the sensor body, and completely covers the antibacterial non-woven membrane substrate 11, the temperature sensitive unit 12 and the electrodes 13; the nose clip 2 is fixed on the outside of the packaging layer, and is used to make the mask and the face fit tightly. The mask strap 3 is arranged on both sides of the packaging layer, and is used to fix the mask on the user's ears.

[0034] In this embodiment, the antibacterial non-woven membrane substrate (substrate size specification: 15 cm × 8 cm rectangle) is prepared by electrospinning porphyrin-grafted polymethyl methacrylate, the spinning solution solute is porphyrin-grafted polymethyl methacrylate, the spinning solution solvent is tetrahydrofuran, the spinning solution concentration is 30%, the spinning voltage is 16 kV, the injection rate is 1 ml / h, and the collection distance is 20 cm.

[0035] In this embodiment, the temperature sensitive unit is fixed on the surface of one side of the antibacterial non-woven membrane, and its size is a 1 cm×1 cm square with a thickness of 50 μm. Its composition is nickel oxide-doped polyimide, and the mass ratio of nickel oxide to polyimide is 2:1.

[0036] In this embodiment, the electrodes (size: 0.5 cm×3 cm rectangle) are respectively compounded on the upper and lower sides of the temperature sensitive unit, and their composition is styrene-butadiene-styrene block copolymer doped with silver nanoparticles; the mass ratio of silver nanoparticles to styrene-butadiene-styrene block copolymer is 3:1.

[0037] In this embodiment, the encapsulation layer is a translucent non-woven membrane, which is located at the outermost side of the sensor body and completely covers the antibacterial non-woven membrane substrate, the temperature sensitive unit and the electrode. The encapsulation layer is prepared by electrostatic spinning of polyurethane, the spinning solution solute is polyurethane, the spinning solution solvent is tetrahydrofuran, the spinning solution concentration is 25%, the spinning voltage is 18kV, the injection rate is 1ml / h, and the collection distance is 20cm. By controlling the spinning time, the thickness of the encapsulation layer can be adjusted, thereby adjusting its transmittance that can be supervised in the 540nm band. In this embodiment, a spinning time of 1h is used, and the transmittance of the obtained encapsulation layer is 32%.

[0038] In this embodiment, the nose clip is fixed to the outside of the packaging layer, and its composition may be aluminum alloy, which has good ductility and aging resistance, and can ensure that the mask fits tightly to the face.

[0039] In this embodiment, the mask straps are arranged on both sides of the packaging layer to fix the mask on the ears of the user, and the components thereof may be spandex fibers.

[0040] When using the above-mentioned mask-type temperature sensor for respiratory monitoring, you need to first wear the sensor on your face in the form of a mask, fix the mask strap behind your ears, and press the nose clip to make the mask fit tightly to your face. Use leads to connect the two electrodes to the positive and negative electrodes of the resistance testing device. During the user's breathing, the temperature of the mask changes with the exhaled gas, causing the resistance of the thermistor in the equivalent circuit to change. The relationship between its resistance and temperature can be described by the following formula:

[0041] Among them, R t is the resistance value at temperature T, R n T n The nominal resistance at the temperature, B is the temperature coefficient. The temperature coefficient and nominal resistance are obtained by calibration before the device is used. t By using the frequency and amplitude of numerical changes in the data, we can calculate the user’s breathing temperature, breathing frequency and other information.

[0042] Reference Figure 2-4 According to the respiratory monitoring results, when the user wears the mask in a healthy and resting state, the device resistance fluctuates between X and Y, with a fluctuation frequency of Z seconds. When the user wears the mask after strenuous exercise, the device resistance fluctuation amplitude becomes smaller and the frequency becomes higher. When the user is in a state of body heating, the device resistance decreases significantly.

[0043] Reference Figure 5Schematic diagram of the mask-type temperature sensor generating active oxygen under 540nm wavelength light. In this embodiment, under normal wearing and use conditions, the mask can generate active oxygen with strong oxidizing ability when exposed to natural light, and kill bacteria through redox reactions. Therefore, the mask-type temperature sensor of this embodiment has a broad-spectrum bactericidal function.

[0044] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

[0045] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0046] The present invention has been described in detail above. It will be apparent to those skilled in the art that the present invention may be implemented in a wide range under equivalent parameters, concentrations and conditions without departing from the spirit and scope of the present invention and without the need for unnecessary experimentation. Although the present invention provides specific embodiments, it should be understood that further improvements may be made to the present invention. In short, according to the principles of the present invention, this application intends to include any changes, uses or improvements to the present invention, including changes made by conventional techniques known in the art that depart from the scope disclosed in this application. Applications of some of the basic features may be made within the scope of the following appended claims.

Claims

1. A mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities, characterized in that: The mask-type temperature sensor comprises a temperature sensor body (1), a nose clip (2), and a mask strap (3); the temperature sensor body comprises an antibacterial non-woven membrane substrate (11), a temperature sensitive unit (12), an electrode (13), and a packaging layer (14); the nose clip (2) is fixed to the outside of the packaging layer; and the mask strap (3) is arranged on both sides of the packaging layer.

2. The mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities according to claim 1, characterized in that: In the temperature sensor body, there are two electrodes (13), which are respectively compounded on both sides of the temperature sensitive unit (12); the temperature sensitive unit compounded with the electrode is fixed on the surface of one side of the antibacterial non-woven membrane substrate (11); the packaging layer is located on the outermost side of the temperature sensor body and completely covers the antibacterial non-woven membrane substrate (11), the temperature sensitive unit (12), and the electrode (13).

3. The mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities according to claim 2, characterized in that: The electrode (13) and the temperature sensitive unit (12) partially overlap each other; one side of the electrode (13) close to the antibacterial non-woven membrane substrate (11) is in close contact with the antibacterial non-woven membrane substrate (11); And / or, the temperature sensitive unit after being combined with the electrode is fixed to the surface of one side of the antibacterial non-woven membrane substrate (11) and arranged in the middle thereof.

4. The mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities according to any one of claims 1 to 3, characterized in that: The porosity of the antibacterial nonwoven membrane substrate is greater than 30% and the porosity is adjustable. The material used to prepare the antibacterial nonwoven membrane substrate is a polymer with porphyrin side chains; preferably, the polymer structure in the polymer with porphyrin side chains is any one of polyurethane and polymethyl methacrylate.

5. The mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities according to any one of claims 1 to 4, characterized in that: The temperature sensitive unit is fixed on the surface of the antibacterial non-woven membrane, and the material used to prepare the temperature sensitive unit is a polymer doped with a negative temperature coefficient metal oxide; Preferably, the mass ratio of the negative temperature coefficient metal oxide to the polymer is 1:1-4:

1.

6. The mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities according to claim 5, characterized in that: The negative temperature coefficient metal oxide is one or more of nickel oxide, copper oxide, zinc oxide, manganese oxide, cobalt oxide, and iron oxide; And / or, the polymer structure is any one of polyurethane, polymethyl methacrylate, polyimide, and polydimethylsiloxane.

7. The mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities according to any one of claims 1 to 6, characterized in that: The material for preparing the electrode is a polymer doped with nano-silver.

8. The mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities according to claim 7, characterized in that: The nanosilver is one or more of silver nanoparticles, silver nanosheets, and silver nanowires; And / or, the polymer is any one of polyurethane, polymethyl methacrylate, styrene-butadiene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, and epoxy resin; And / or, the mass ratio of the nanosilver to the polymer is 2:1-10:

1.

9. The mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities according to any one of claims 1 to 8, characterized in that: The encapsulation layer is a translucent non-woven film, and the material for preparing the encapsulation layer is any one of polyurethane, polymethyl methacrylate, styrene-butadiene-styrene block copolymer, and styrene-ethylene-butylene-styrene block copolymer; And / or, the transmittance of the encapsulation layer to visible light in the 540nm band is greater than 10%.

10. The mask-type temperature sensor with broad-spectrum antibacterial and respiratory monitoring capabilities according to any one of claims 1 to 9, characterized in that: The material for making the nose clip is any one of aluminum alloy, polypropylene, polyethylene terephthalate, and polyurethane; And / or, the material for preparing the mask strap is any one of spandex, polyester, styrene-butadiene-styrene block copolymer, and styrene-ethylene-butylene-styrene block copolymer.

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