TWI734927B - Intelligent moisture absorption and detecting material and applications thereof - Google Patents

Abstract

Present invention is related to an intelligent moisture absorption and detecting material and moisture controlling system thereof. The intelligent moisture absorbing and detecting material has a substrate with flexible, tensile, and compression functions and at least two conductive lines adhering to a surface of the substrate. The conductive line is made of numerous conductive units to make the conductive line being non-solid but still keep electrical conductive state. By structural/ pattern design, the present invention is able to overcome the bad extensibility, easy to crack, higher material cost, extend storage and usage time of the conventional method without affecting the conductivity. Furthermore, reducing the amount of conductive silver paste, taking into account the electrical conductivity and material cost effect, is an innovative and practical invention.

Description

Intelligent moisture sensing material and its application

A moisture absorption sensing material, especially an intelligent moisture absorption sensing material with humidity management function.

The blood and suppuration on the wound can cause further deterioration, which may cause ulcers to rot, and even risk of amputation or septic shock; poor patients and urinary incontinence silver-haired people should change their diapers regularly. Bed sores, skin allergies, or uncomfortable feelings. Nursing staff should always pay attention to the dressings of the patient, the injured, or the diaper status of the poor patients and urinary incontinence silver-haired people, and change the dressings and diapers in time to avoid them. The above situation happened.

However, in the current situation of serious imbalance in the medical-to-health ratio and insufficient medical staff, it is difficult to always pay attention to the status of each patient, resulting in medical disputes and aggravation of the disease. It is also because of the lack of medical staff and overtime work. Significantly reduce the quality of medical care.

At present, the industry has proposed solutions to this problem. For example, a sensing line made of conductive silver glue is set on the dressing and diapers to sense the humidity state of the dressing, and then a warning signal is issued by the change of the humidity state. Remind the medical staff to replace the dressing and diapers, but the existing sensing lines are all solid printed, and the conductive silver glue has poor extensibility. As the dressing is flexed or stretched, cracks may occur, resulting in a decrease in the electrical conduction effect , It affects the quality of sensing, and the solid printed sensing line uses more materials, which is expensive and difficult to store.

In order to improve the current medical staff’s serious imbalance due to the medical-to-illness ratio, they cannot always pay attention to the wound or diaper status of each injury and patient, as well as the existing dressings and diapers with sensing functions. The sensing line cannot follow the flexure of the dressing or diaper Or the degree of stretching may lead to cracks and then affect the quality of sensing. The present invention provides an intelligent moisture-absorbing sensor material, which comprises: a substrate with flexible, tensile or compressive properties; and At least two conductive strips are arranged at intervals and attached to the surface of the substrate, and each conductive strip is composed of a plurality of electrically conductive units, so that the conductive strips are attached to the surface of the substrate in a non-solid but continuously electrically conductive state.

Wherein, the electrical conduction unit has tensile properties in the length, width or thickness direction of the conductive strip.

Wherein, the electrical conduction unit is a grid or a totem, where: the grid includes a square grid, an oblique square grid, a double-strand spiral grid, a zigzag staggered grid, or a square wave staggered grid; and the totem includes a single strand Spiral, zigzag or square wave.

Wherein, the substrate is a polymer film, sheet, woven fabric, knitted fabric or non-woven fabric; and the material of the electrical conduction unit includes conductive silver glue, conductive copper glue, conductive carbon nanotube (CNT) glue, and conductive graphite Vinyl glue, conductive carbon black glue or conductive polymer, the electrical conduction unit is attached to the surface of the substrate by printing, physical sputtering (PVD), chemical sputtering (CVD) or 3D printing.

Wherein, the line width of the conductive strip is more than 0.15mm, and the spacing between the conductive strips is more than 0.1mm; and the wire diameter of the electrically conductive unit is more than 100nm.

Wherein, the conductive strips are arc, zigzag, concentric or curved and arranged on the surface of the substrate.

The present invention further provides a humidity management system for an intelligent moisture absorption sensing material, which comprises the aforementioned intelligent moisture absorption sensing material and a humidity management module electrically connected to the intelligent moisture absorption sensing material, wherein the humidity management The modules include mutually electrically connected: a receiving interface unit, the receiving interface unit Receiving the resistance value of at least two conductive strips of the smart moisture absorption sensor material and outputting a signal; a micro central processing unit (MCU), the micro central processing unit receiving the resistance value output signal from the receiving interface unit, And judge; and an output interface unit, the micro central processing unit makes the output interface unit output response.

Wherein, the humidity management module is electrically connected to at least two conductive strips of the intelligent moisture absorption sensing material by using adhesive, button-type connectors or clip-type connectors.

Among them, the output response of the output interface unit includes activating an LED light, vibration, buzzer, or generating an electronic signal.

Among them, the electronic signal generated by the output interface unit includes output methods such as Wi-Fi or Bluetooth.

Further, the present invention provides a smart dressing, smart diapers, smart diapers, and smart diapers, which include the aforementioned smart moisture-absorption sensing material.

According to the above description, the present invention has the following advantages:

1. The present invention can sense the humidity status of intelligent moisture absorption materials, such as dressings and diapers, and feed it back to medical staff, so that medical staff do not need to spend a lot of effort to look after the state of different patients, which can not only reduce medical disputes and avoid The problem of aggravated illness can reduce the workload of medical staff, improve the comfort of patients, increase the quality of medical care, and even greatly enhance the comfort and respect of patients.

2. The feature of the present invention is that the conductive strip is attached to the surface of the substrate in a state of non-solid but continuous electrical conduction, and the conductive strip has tensile, bending and compressive properties in the length, width or thickness direction, using the structure / Graphic design to overcome the problems of poor elongation, easy cracking and high material cost of conductive silver glue, and without affecting the conductivity, further reduce the amount of conductive silver glue and extend the storage and use time, taking into account the conductivity And cost effect, it is an invention and creation of innovation and optimization.

10: Intelligent moisture absorption sensing material

11: Substrate

12: Conductive strip

121: electrical conduction unit

20: Humidity Management Module

21: Accept the interface unit

22: Micro Central Processing Unit (MCU)

23: output interface unit

FIG. 1 is a schematic diagram of the first preferred embodiment of the intelligent moisture absorption sensing material of the present invention.

Figures 2a to 2j are schematic diagrams of a preferred embodiment of the electrical conduction unit.

Fig. 3 is a schematic diagram of the humidity management system of the intelligent moisture absorption sensing material of the present invention.

Fig. 4 is a graph showing the change of the resistance change rate and the diffusion area generated by the dripping water in the 50ml dripping test of the present invention.

Fig. 5 is a graph showing the change of resistance value caused by stretching according to the present invention.

Please refer to FIG. 1, which is a preferred embodiment of the smart moisture absorption sensor 10 of the present invention, which includes a substrate 11 and at least two conductive strips 12 arranged at intervals and attached to the surface of the substrate 11. The substrate 11 has the characteristics of being flexible, stretchable or compressible. The conductive strip 12 is composed of a plurality of electrically conductive units 121, so that the conductive strip 12 is attached to the surface of the substrate 11 in a non-solid but continuously electrically conductive state .

The aforementioned non-solid means that a plurality of the electrically conductive units 121 of the conductive strip 12 may be presented in the form of grids or totems, and the grid or totem formed by the electrically conductive units 121 is preferably in the conductive strip 12 At least the length, width and/or thickness directions have tensile properties. Please refer to FIG. 2. When the electrical conduction unit 121 is in the form of a grid, the aspect may include a square grid (Figure 2a), a rhombic grid (2b), a double-strand spiral grid (Figure 2c, Figure 2i), Zigzag staggered grid (Figure 2d) or square wave staggered grid (Figure 2e, Figure 2j), etc., and when the electrical conduction unit 121 is in the form of a totem, the pattern can include a single spiral (Figure 2f), a sawtooth (Figure 2f), etc. 2g) or square wave (Figure 2h) and so on. The aforementioned form of the electrical conduction unit 121 is only a preferred embodiment of the present invention, and is not intended to limit the present invention to only be presented in the form of the aforementioned grid or totem. For example, the conductive strip 12 is non-solid and continuously electrically conductive. As well as the state in which the length, width, and/or thickness directions have properties of stretching, extension, bending, or compression, they all fall within the scope of the present invention. In addition, due to the moisture diffusion trajectory, the at least two conductive strips 12 of the present invention are preferably arranged on the surface of the substrate 11 in the form of arcs, zigzags, concentric circles or curves to achieve the most suitable sensing effect.

Wherein, the substrate 11 is a polymer film, sheet, fabric or non-woven fabric, the fabric may include woven fabric, knitted fabric, and the material of the electrical conduction unit 121 includes conductive silver glue, conductive copper glue, and conductive carbon nanotube glue. (CNT), conductive graphene glue, conductive carbon black glue or conductive polymer, preferably attached to the surface of the substrate 11 by printing, physical sputtering (PVD), chemical sputtering (CVD) or 3D printing , And the aforementioned printing methods include screen printing.

The width of the conductive strip 12 composed of a plurality of the conductive units 121 is preferably 0.15mm or more or more than 0.3mm, and the distance between the conductive wires 12 is preferably 0.1mm or more; and the conductive unit The wire diameter of 121 depends on the manufacturing process, and is preferably above 100nm (physical sputtering, chemical sputtering or 3D printing) or above 0.1mm (printing).

Please refer to FIG. 3, the intelligent moisture absorption sensing material 10 of the present invention is further electrically connected to a humidity management module 20. The humidity management module 20 includes a receiving interface unit 21 and a micro processing unit (MCU) that are electrically connected to each other. 22 and an output interface unit 23. The receiving interface unit 21 receives the resistance values of at least two of the conductive strips 12 of the smart moisture absorption sensing material 10 and transmits them to the micro central processing unit 22. The micro central processing unit 22 determines When the change of the resistance value reaches a certain threshold (Threshold), the output interface unit 23 is made to output a response.

The humidity management module 20 of the present invention senses its moisture state through at least two conductive strips 12 of the intelligent moisture absorption sensing material 10. Taking application in a diaper as an example, when the diaper is in a dry state, the at least two conductive strips 12 The measured resistance value is infinite because there is no conductive loop, and when the diaper absorbs water to a certain extent, the resistance value ^{rises from 10 4} Ω to about 5*10 ⁴ kΩ (as shown in Figure 4) Since the resistance value of high-quality tap water is about 10 ⁴ to 10 ⁵ Ω, the receiving interface unit 21 receives the signal that the resistance value increases, and transmits it to the micro central processing unit 22 to make the output interface unit 23 output a response.

Wherein, the way of electrically connecting the intelligent moisture absorption sensing material 10 and the humidity management module 20 can use general existing technology, such as adhesive, button type connector or clip type connector, and connect to the humidity by a conductive wire. Management module 20. When using a button-type connector, the female buckle part must be fixed to the guide On the electric bar 12, the male buckle part also needs to be welded to one end of the conductive wire, and the other end of the conductive wire is connected to the humidity management module 20; the clip connector can be directly clamped on the conductive bar 12, and then The humidity management module 20 is connected through conductive wires.

The output response of the output interface unit 23 can include activating LED lights, vibration, buzzer, or generating an electronic signal to directly indicate the need to replace the dressing material, or generating an electronic signal to be monitored and managed by a micro-control unit (MCU) After communicating with WI-FI or Bluetooth communication mechanism, it is sent to nursing station, doctor's mobile phone, family mobile phone, specific caregiver or professional caregiver, so as to monitor the humidity state of the smart moisture sensor 10 or the diaper in real time for timely replacement.

The intelligent moisture absorption sensing material 10 of the present invention can be a gauze dressing covering wounds, or a dressing material for receiving and absorbing body fluids such as diapers, diapers, diapers, sanitary napkins, or pads. When the present invention is used as dressings, diapers, diapers, sanitary napkins, diapers or pads, it can be further laminated with other absorbent materials or covering materials according to requirements, which is not limited here.

Next, in order to verify that the conductive strip 12 with non-solid and continuous electrical conduction of the present invention does have the claimed effect, the following provides a preferred implementation example and provides related data diagrams for testing.

[Example 1]

Substrate 11: polymer non-woven fabric; conductive silver glue: silver particles D50=2.5μm, solid content=58±2%.

Two conductive strips 12: plural of the screen printing wire diameter of the electrical conduction unit 121 = 0.5mm, line spacing = 0.5mm, 250Mesh screen, after screen printing, it is dried and heat treated at 150℃ for 3-5 minutes, using infrared heating The furnace performs surface drying.

The test of the resistance change rate and diffusion area of the present invention found that the resistance value and diffusion area tend to increase with the increase of time, as shown in FIG. 4. Furthermore, it was found in the sensitivity test that the present invention can display the LED warning signal within 1.0 second, and has high sensitivity.

Please refer to FIG. 5, which is a graph of the resistance value of the present invention. According to the invention, during the stretching process of the substrate 11, although the resistance value of the invention increases slightly (between 3.5-6.0Ω), it still maintains a stable state.

The foregoing descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of rights claimed by the present invention. All other equivalent changes or modifications completed without departing from the spirit disclosed by the present invention should be included in the present invention. Within the scope of patent application.

10: Intelligent moisture absorption sensing material

11: Substrate

12: Conductive strip

121: electrical conduction unit

Claims (8)

An intelligent moisture-absorbing sensor material, comprising: a substrate, the substrate has the characteristics of flexibility, stretching or compression; at least two conductive strips are arranged at intervals and attached to the surface of the substrate, and each conductive strip is in plural The conductive strip is composed of a conductive unit, so that the conductive strip is attached to the surface of the substrate in a non-solid but continuous electrically conductive state; wherein: the width of the conductive strip is more than 0.15mm, and the spacing between the conductive strips is more than 0.1mm. The conductive strips are arranged on the surface of the substrate in the form of arcs, zigzag lines, concentric circles or curves; and the wire diameter of the electrical conduction unit is more than 100nm. The material of the electrical conduction unit includes conductive silver glue, conductive copper glue, and conductive nanometer. Carbon tube glue, conductive graphene glue or conductive carbon black glue, the electrical conduction unit is formed by printing, physical sputtering, chemical sputtering, or 3D printing to form a grid or totem attached to the surface of the substrate. For example, the intelligent moisture absorption sensing material of item 1 in the scope of patent application, the electrical conduction unit has tensile, bending and/or compressive properties in the length, width or thickness direction of the conductive strip. For example, the intelligent moisture absorption sensing material of item 1 or 2 of the scope of patent application, the electrical conduction unit is a grid or a totem, where: the grid includes a square grid, an oblique square grid, a double-strand spiral grid, and a zigzag staggered grid. Grid or square wave staggered grid; and the totem contains a single spiral, zigzag, or square wave. For example, the intelligent moisture absorption sensing material of the first item in the scope of patent application, wherein: the substrate is a polymer film, sheet, fabric or non-woven fabric; and the fabric includes a woven fabric or a knitted fabric. An intelligent dressing material, which includes the intelligent moisture absorption sensing material of item 1, 2, 3, or 4 in the scope of patent application. A smart diaper, which contains the smart moisture-absorbing sensing material of items 1, 2, or 3, and 4 in the scope of patent application. A smart diaper, which contains the smart moisture-absorption sensing material of items 1, 2, 3, or 4 in the scope of patent application. A smart diaper, which contains the smart moisture-absorbing sensing material of item 1, 2, 3, or 4 in the scope of patent application.

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