Temperature change measurement sensor

Abstract

The present invention relates to a temperature change sensor. In one aspect, the present invention provides a temperature change sensor including: a first composite material layer including a polymer whose volume changes in response to a temperature change; an electrode layer provided on one side of the first composite material layer and capable of indicating the temperature change as a change in resistance; and a second composite material layer at least a portion of which is provided on the upper side of the first composite material layer and includes at least one of carbon nanotubes (CNTs), boron nitride nanotubes (BNNTs), and graphene and polydimethylsiloxane (PDMS), or a thermoplastic polyurethane elastomer (TPU) to transmit a temperature change occurring on one side to the other side.

Description

[Technical field]

[0001] The present invention relates to a temperature change measuring sensor. [Background technology]

[0002] Recently, there has been an increasing demand for cosmetics that have a texture that suits one's preference (stickiness, refreshing feeling, diffusibility, etc.).

[0003] In response to this demand for cosmetics, most cosmetic companies are developing new products and implementing emotional marketing strategies through analysis of the feel of cosmetics (stickiness, refreshing feeling, spreadability, etc.), and they employ and operate personnel who specialize in measuring the feel of cosmetics.

[0004] Thus, while specialized personnel are being employed and various research is being carried out to measure the usability of cosmetics, there is a problem in that it is difficult to quantify the usability.

[0005] In particular, there is currently no device that can quantitatively measure the cooling sensation that accompanies the evaporation of cosmetics, and in order to produce a cooling sensation, it is necessary to rely on the experience of specialized personnel, which makes it difficult to quickly measure the cooling sensation of a large amount of cosmetics.

[0006] In addition, since such a professional is affected by the physical condition, outside temperature, humidity, etc. on the day of measurement, there is a problem that the degree of cool sensation cannot be measured accurately. Summary of the Invention [Problem to be solved by the invention]

[0007] The embodiments of the present invention have been proposed to solve the above problems, and provide a temperature change measurement sensor that can quantitatively measure the degree of refreshing sensation caused by the evaporation of a cosmetic material. [Means for solving the problem]

[0008] In one embodiment of the present invention, a temperature change measurement sensor may be provided, the temperature change measurement sensor including: a first composite material layer including a polymer whose volume changes in response to a temperature change; an electrode layer provided on one side of the first composite material layer and capable of indicating the temperature change as a change in resistance; and a second composite material layer, at least a portion of which is provided on an upper side of the first composite material layer and includes at least one of carbon nanotubes (CNTs), boron nitride nanotubes (BNNTs), and graphene, and polydimethylsiloxane (PDMS), or includes a thermoplastic polyurethane elastomer (Thermoplastic PolyUrethane, TPU), so as to transmit a temperature change occurring on one side to the other side.

[0009] In addition, the temperature change measuring sensor may be provided such that the second composite material layer has a thickness of 1 μm to 30 μm.

[0010] In addition, the second composite material layer may be formed of carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS), and a temperature change measuring sensor having a weight ratio of the carbon nanotubes (CNTs) of 15% to 20% may be provided.

[0011] In addition, the second composite material layer may be formed of a thermoplastic polyurethane elastomer (Thermoplastic Polyurethane, TPU), and the second composite material layer may have a thickness of 1 μm to 10 μm.

[0012] In addition, a temperature change measuring sensor may be provided in which the electrode layer includes a first electrode disposed on one upper side of the first composite material layer and a second electrode spaced apart from the first electrode, and the first electrode and the second electrode are disposed on the same plane.

[0013] In addition, a temperature change measuring sensor may be provided in which the first electrode includes a first vertical electrode arranged in one direction and a plurality of first horizontal electrodes extending from the first vertical electrode at a predetermined angle, and the second electrode includes a second vertical electrode arranged in one direction and a plurality of second horizontal electrodes extending from the second vertical electrode at a predetermined angle, and the plurality of first horizontal electrodes and the plurality of second horizontal electrodes are alternately arranged and parallel to each other.

[0014] The second composite material layer may also be in contact with the first electrode and the second electrode, and a temperature change measuring sensor may be provided in contact with the first composite material layer between the first electrode and the second electrode.

[0015] A temperature change measuring sensor may also be provided in which the upper surface of the second composite material layer is flat and the lower surface of the second composite material layer is provided with a protrusion that fills the gap between the first electrode and the second electrode.

[0016] In addition, a temperature change measurement sensor may be provided in which the first composite material layer includes polyvinylidene fluoride (PVDF), graphene oxide (rGO), and a semi-crystalline polymer mixed with polyvinylidene fluoride (PVDF) and graphene oxide (rGO).

[0017] Also, there may be provided a temperature change measuring sensor, in which the semi-crystalline polymer is polyethylene oxide (PEO).

[0018] In another embodiment of the present invention, a matching system may be provided that includes a server capable of converting the change in resistance measured by a temperature change measuring sensor into a pre-set first value related to coolness, and the server may compare and display a second value related to coolness inputted from a panel terminal with the first value.

[0019] In addition, a matching system may be provided that includes a database storing a correlation between the amount of change in resistance and the first numerical value, and the server can update the correlation between the amount of change in resistance and the first numerical value. Effect of the Invention

[0020] The temperature change measuring sensor according to an embodiment of the present invention has an advantage in that it can quantitatively measure the degree of cool sensation caused by evaporation of a cosmetic material. [Brief description of the drawings]

[0021] [Figure 1] 2 is a schematic diagram illustrating a temperature change measuring sensor viewed from above in accordance with an embodiment of the present invention; [Diagram 2] 2 is a cross-sectional view of the temperature change measuring sensor of FIG. 1 taken along line AA'. [Diagram 3] 1 is a conceptual diagram showing the configuration of a first composite material layer before the temperature increases. [Figure 4] 4 is a conceptual diagram illustrating the configuration of the first composite material layer of FIG. 3 after the first composite material layer has been heated. [Diagram 5] 2 is a graph showing the degree of cool sensation felt by a user over time, measured as a change in resistance after a cosmetic product is applied to the temperature change measuring sensor of FIG. 1. [Figure 6] 2 is a graph showing the change in resistance measured when an external force (pressure) is applied to the temperature change measuring sensor of FIG. 1. [Figure 7] 2 is a diagram illustrating a matching system capable of comparing a value relating to a cooling sensation measured by the temperature change measuring sensor of FIG. 1 with a value relating to a cooling sensation measured by an expert panel. [Figure 8] 2 is a graph showing a comparison between the cooling sensation measured by the temperature change measuring sensor of FIG. 1 and the cooling sensation sensed by an expert panel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] In the following, specific embodiments of the present invention will be described in detail with reference to the drawings. In the description of the present invention, if it is determined that a detailed description of related known configurations or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0023] FIG. 1 is a diagram showing a schematic view of a temperature change measuring sensor according to one embodiment of the present invention viewed from above, and FIG. 2 is a cross-sectional view of the temperature change measuring sensor 1 of FIG. 1 cut along line A-A'.

[0024] Referring to Figures 1 and 2, a temperature change measuring sensor 1 according to one embodiment of the present invention may include a first composite material layer 10 capable of sensing a temperature change, an electrode layer 20 capable of expressing the temperature change as a change in resistance, and a second composite material layer 30 made of a material with excellent thermal conductivity.

[0025] The temperature change measuring sensor 1 of this embodiment can sensitively detect temperature changes in real time. For example, a cosmetic sample is placed on the upper surface of the second composite material layer 30 of the temperature change measuring sensor 1, and the temperature change corresponding to the heat of evaporation as the cosmetic evaporates can be measured as a change in resistance.

[0026] Such a temperature change measuring sensor 1 can be understood as a sensor that can quantitatively (numerically) measure the refreshing sensation felt by a user as the cosmetic evaporates after the user applies the cosmetic to the skin.

[0027] For convenience of explanation, this embodiment will be described by defining the x-axis direction in FIG. 1 as the horizontal direction and the y-axis direction as the vertical direction.

[0028] The first composite material layer 10 may be a plate having a preset thickness t1. For example, the thickness t1 of the first composite material layer 10 may be 10 μm to 100 μm. Preferably, the thickness t1 of the first composite material layer 10 may be 20 μm to 50 μm. More preferably, the thickness t1 of the first composite material layer 10 may be 30 μm.

[0029] In addition, the first composite material layer 10 may be made of a composite material that can sense small temperature changes in the order of 0.1°C.

[0030] The first composite layer 10 may be made of a material having excellent temperature sensitivity. For example, the first composite layer 10 may be a composite material in which polyvinylidene fluoride (PVDF), graphene oxide (rGO), and a semi-crystalline polymer (e.g., polyethylene oxide (PEO)) are mixed.

[0031] Here, the volume of a semi-crystalline polymer (e.g., polyethylene oxide (PEO)) can change depending on the temperature, and when the semi-crystalline polymer applies pressure to the surrounding material, the electrical properties (electrical conductivity) of the first composite material layer 10 changes, and the change in electrical conductivity in the first composite material layer 10 can be sensed by the electrode layer 20. That is, the temperature change caused by the evaporation of the cosmetic on the upper surface of the second composite material layer 30 is transmitted to the first composite material layer 10 containing the semi-crystalline polymer, and by measuring the change in electrical conductivity of the first composite material layer 10, the temperature change occurring on the upper surface of the second composite material layer 30 can be quantitatively measured.

[0032] This will be explained in more detail below.

[0033] An electrode layer 20 may be provided on the top side of the first composite layer 10 and may convert a change in temperature of the first composite layer 10 into a change in resistance to indicate this.

[0034] The electrode layer 20 may have a preset thickness t2 and may include a pair of electrodes 210, 220 spaced apart from each other. For example, the electrode layer 20 may include a first electrode 210 disposed on one side of the upper side of the first composite material layer 10 and a second electrode 220 spaced apart from the first electrode 210, and the first electrode 210 and the second electrode 220 may be disposed on the same plane. Also, the electrode layer 20 may be provided by a metal having thermal conductivity.

[0035] When the first electrode 210 and the second electrode 220 are arranged on the same plane, the amount of temperature change occurring in the temperature change measuring sensor 1 can be measured regardless of the force (pressure) applied to the temperature change measuring sensor 1. This will be described in more detail later with reference to FIG.

[0036] The electrode layer 20, including the first electrode 210 and the second electrode 220, can cover 50% or more of the area of ​​the upper surface of the first composite layer 10. Preferably, the electrode layer 20 can cover 80% or more of the area of ​​the upper surface of the first composite layer 10. More preferably, the electrode layer 20 can cover 95% or more of the area of ​​the upper surface of the first composite layer 10.

[0037] Specifically, the first electrodes 210 and the second electrodes 220 have a structure in which at least a portion of them alternate with each other, so that the electrode layer 20 can cover a large area across the entire upper surface of the first composite material layer 10.

[0038] The first electrode 210 may include a first vertical electrode 212 arranged in one direction and a plurality of first horizontal electrodes 214 extending at a predetermined angle from the first vertical electrode 212. Here, the angle between the first vertical electrode 212 and the first horizontal electrode 214 may be 90°.

[0039] The second electrode 220 may include a second vertical electrode 222 arranged in one direction and a plurality of second horizontal electrodes 224 extending at a predetermined angle from the second vertical electrode 222. Here, the angle between the second vertical electrode 222 and the second horizontal electrode 224 may be 90°.

[0040] The second horizontal electrodes 224 and the first horizontal electrodes 214 may be arranged alternately and parallel to each other. For example, the first horizontal electrode 214a of the first horizontal electrodes 214 may be arranged, the first second horizontal electrode 224a of the second horizontal electrodes 224 may be arranged, the second first horizontal electrode 214b of the first horizontal electrodes 214 may be arranged, the second second horizontal electrode 224b of the second horizontal electrodes 224 may be arranged, the third first horizontal electrode 214c of the first horizontal electrodes 214 may be arranged, and the third second horizontal electrode 224c of the second horizontal electrodes 224 may be arranged.

[0041] In this embodiment, an example will be described in which there are three first horizontal electrodes 214 and three second horizontal electrodes 224, but the numbers of the first horizontal electrodes 214 and second horizontal electrodes 224 are not limited and may vary depending on the proportion of the upper surface of the first composite material layer 10 that can be covered. By realizing a structure in which the first horizontal electrodes 214 of the first electrode 210 and the second horizontal electrodes 224 of the second electrode 220 are alternately arranged in this manner, the electrode layer 20 can cover a large area over the upper surface of the first composite material layer 10, and the temperature change occurring in the entire temperature change measurement sensor 1 can be accurately measured.

[0042] Furthermore, the width W1 by which the first electrode 210 and the second electrode 220 are separated in the horizontal direction may be 0.1 mm to 1.0 mm, and the width W2 by which the first electrode 210 and the second electrode 220 are separated in the vertical direction may be 0.1 mm to 1.0 mm. However, the width by which the first electrode 210 and the second electrode 220 are separated may be changed depending on the size of the temperature change measuring sensor 1.

[0043] Furthermore, the electrode layer 20 may be provided with a thickness t2 of 10 nm to 100 nm. Preferably, the electrode layer 20 may be provided with a thickness t2 of 20 nm to 80 nm. More preferably, the electrode layer 20 may be provided with a thickness t2 of 50 nm. By providing the electrode layer 20 with a thin thickness in this manner, the temperature change that occurs on the surface of the second composite material layer 30 due to evaporation of the cosmetic can be easily transmitted through the electrode layer 20 to the first composite material layer 10.

[0044] A second composite layer 30 may be provided on top of the first composite layer 10 and the electrode layer 20 .

[0045] The second composite layer 30 can cover the first electrode 210 and the second electrode 220, and at the same time cover the first composite layer 10. Specifically, the upper surface of the second composite layer 30 can be provided in the form of a flat plate, and the lower surface of the second composite layer 30 can contact the upper surfaces of the first electrode 210 and the second electrode 220, and can also contact at least a portion of the upper surface of the first composite layer 10.

[0046] A protrusion 32 for filling the gap S between the first electrode 210 and the second electrode 220 may be provided on the underside of the second composite material layer 30. Here, the protrusion 32 is provided between the first electrode 210 and the second electrode 220, and may have a convex shape on the lower side with respect to a plane contacting the first electrode 210 and the second electrode 220.

[0047] In this way, by providing the protrusion 32, the second composite material layer 30 and the first composite material layer 10 can be in direct contact with each other, so that temperature changes occurring in the second composite material layer 30 can be more accurately transmitted to the first composite material layer 10.

[0048] The second composite material layer 30 protects the electrode layer 20 from the outside, thereby preventing deterioration in performance of the temperature change measuring sensor 1 due to repeated use. Here, the second composite material layer 30 can be understood as a protective layer.

[0049] The second composite material layer 30 may be formed of a material having high thermal conductivity and wear resistance, for example, the second composite material layer 30 may include at least one of carbon nanotubes (CNTs), boron nitride nanotubes (BNNTs), and graphene, and polydimethylsiloxane (PDMS).

[0050] For example, the second composite material layer 30 can be formed with a weight ratio of 5% to 15% carbon nanotubes (CNTs), 5% to 15% boron nitride nanotubes (BNNTs), 1% to 5% graphene, and 85% to 99% polydimethylsiloxane (PDMS).

[0051] For example, the second composite material layer 30 can be formed of carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS) with the weight ratio of carbon nanotubes (CNTs) being 5% to 15%. In this case, the thermal conductivity of the second composite material layer 30 can be increased.

[0052] The second composite material layer 30 may also be formed from a thermoplastic polyurethane elastomer (Thermoplastic Polyurethane (TPU)).

[0053] By forming the second composite material layer 30 from a material with high thermal conductivity, when a cosmetic is applied to the upper side of the second composite material layer 30, the degree of temperature change that occurs as the cosmetic evaporates can be quickly transmitted to the first composite material layer 10.

[0054] More specifically, the temperature change on the upper side of the second composite material layer 30 is transmitted to the first composite material layer 10, the electrical conductivity of the first composite material layer 10 may change in response to the temperature change in the first composite material layer 10, and the change in electrical conductivity in the first composite material layer 10 is sensed by the electrode layer 20, thereby quantitatively indicating the temperature change on the upper side of the second composite material layer 30. A detailed description of the change in electrical conductivity associated with temperature change in the first composite material layer 10 will be provided later.

[0055] In other words, by providing the second composite material layer 30 from a material with high thermal conductivity, the temperature change associated with the evaporation of the cosmetic on the upper surface of the second composite material layer 30 can be efficiently transmitted to the first composite material layer 10.

[0056] The thickness t3 of the second composite material layer 30 may be 1 μm to 30 μm. Preferably, the thickness t3 of the second composite material layer 30 may be 1 μm to 10 μm. By providing the second composite material layer 30 with such a small thickness, it is possible to effectively transmit the temperature change accompanying the evaporation of the cosmetic.

[0057] Furthermore, when the second composite material layer 30 is made of a thermoplastic polyurethane elastomer (TPU), the thickness of the second composite material layer 30 may be 1 μm to 10 μm.

[0058] In addition, the second composite material layer 30 can cover the first electrode 210 and the second electrode 220, while also covering the first composite material layer 10 exposed through the gap S between the first electrode 210 and the second electrode 220.

[0059] When the second composite material layer 30 is viewed based on the A-A' cross section, the upper surface of the second composite material layer 30 is flat, but the lower surface of the second composite material layer 30 may include a protrusion 32 that fills the gap S between the first electrode 210 and the second electrode 220.

[0060] As described above, by providing the protrusion 32, the second composite material layer 30 and the first composite material layer 10 can be in direct contact with each other, so that temperature changes occurring in the second composite material layer 30 can be directly transmitted to the first composite material layer 10.

[0061] In the above embodiment, an example has been described in which the first composite material layer 10, the electrode layer 20 and the second composite material layer 30 are stacked, but the first composite material layer 10 may further include a substrate layer (not shown) made of PDMS underneath.

[0062] In addition, a heating layer (not shown) may be further included under the substrate layer, which can maintain the temperature at 33° C. to 37° C., which is approximately the same as the temperature of human skin.

[0063] FIG. 3 is a conceptual diagram showing the configuration of the first composite material layer 10 before the temperature is increased, and FIG. 4 is a conceptual diagram showing the configuration of the first composite material layer 10 after the first composite material layer 10 of FIG. 3 has been heated.

[0064] In the following, the first composite material layer 10 will be explained in more detail with reference to FIGS.

[0065] The first composite layer 10 may be provided with a composite material that may change electrical conductivity in response to a change in temperature. For example, the first composite layer 10 may include a polymer matrix 12, an electrically conductive filler 14, and a semi-crystalline polymer 16.

[0066] In this embodiment, the polymer matrix 12 is polyvinylidene fluoride (PVDF), the conductive filler 14 is graphene oxide (rGO), and the semi-crystalline polymer 16 is polyethylene oxide (PEO) as an example. However, the present invention is not limited to this, and the first composite material layer 10 may be provided with other composite materials whose electrical conductivity can be changed according to a change in temperature.

[0067] The first composite material layer 10 may have a structure in which graphene oxide (rGO) 14 and polyethylene oxide (PEO) 16 are distributed within polyvinylidene fluoride (PVDF) 12.

[0068] Polyvinylidene fluoride (PVDF) 12 is a resin in which hydrogen atoms in the molecular structure of aliphatic hydrocarbons are partially replaced with fluorine atoms. It has excellent chemical resistance, mechanical, thermal and electrical properties of fluororesin, and has high crystallinity and excellent mechanical strength among fluororesins, so it can impart excellent physical properties to composite materials.

[0069] Graphene oxide (rGO) 14 can realize high voltage strength while having excellent thermal and electrical conductivity properties. Graphene oxide (rGO) 14 can show high compatibility in thermosetting resins and can be used as a conductive material and a temperature sensing material by being added to a polymer matrix.

[0070] A composite material consisting of polyvinylidene fluoride (PVDF) 12 and graphene oxide (rGO) 14 has NTC properties and can be used as a temperature sensing material.

[0071] A composite material consisting of only polyvinylidene fluoride (PVDF) 12 and graphene oxide (rGO) 14 has poor temperature sensitivity because the change in resistance value due to temperature is not large, making it difficult to apply to a highly accurate temperature sensor. In this embodiment, to solve this problem, a first composite material layer 10 is formed by mixing polyethylene oxide (PEO) 16 with polyvinylidene fluoride (PVDF) 12 and graphene oxide (rGO) 14.

[0072] Polyethylene oxide (PEO) 16 is a semi-crystalline polymer that has the property of expanding or contracting in volume depending on temperature.

[0073] The polyethylene oxide (PEO) 16 is uniformly distributed within the material consisting of the polyvinylidene fluoride (PVDF) 12 and the graphene oxide (rGO) 14, and this distribution can improve the temperature sensing sensitivity of the first composite material layer 10 consisting of the polyvinylidene fluoride (PVDF) 12, the graphene oxide (rGO) 14, and the polyethylene oxide (PEO) 16. The temperature sensing sensitivity of the first composite material layer 10 can be 0.1°C.

[0074] FIG. 3 shows the polyethylene oxide (PEO) 16 before the volume increase before the temperature is increased, and FIG. 4 shows the polyethylene oxide (PEO) 16 after the temperature is increased and the volume increase.

[0075] The characteristics of the temperature change sensed by the first composite material layer 10 will be described below.

[0076] When the first composite layer 10 is heated, the particles of polyethylene oxide (PEO) 16 expand as the temperature increases, and the expanded polyethylene oxide (PEO) 16 applies pressure to the polyvinylidene fluoride (PVDF) 12 and the graphene oxide (rGO) 14, increasing the contact area between the graphene oxide (rGO) 14 and potentially changing the electrical properties (electrical conductivity) of the first composite layer 10.

[0077] Such a change in the electrical property (electrical conductivity) of the first composite material layer 10 due to a change in temperature can be sensed by the electrode layer 20 and represented as a change in resistance.

[0078] In the following, a process for placing a cosmetic (sample) on the temperature change measuring sensor 1 and then measuring the degree of cool feeling as the cosmetic evaporates will be described.

[0079] For the purpose of the experiment, the lower part of the temperature change measuring sensor 1 can be heated and set to the same temperature conditions as the skin.

[0080] When a cosmetic (sample) is spread flat over a wide area on the top of the second composite material layer 30, the cosmetic evaporates over time. As a result, the temperature of the surface of the second composite material layer 30 drops, and the temperature change is transmitted to the bottom of the second composite material layer 30, so that the temperature change can be sensed by the first composite material layer 10. The degree of this temperature change can be digitized and converted into a resistance change through the electrode layer 20.

[0081] Conventionally, there was a problem that the degree of cool sensation felt when the cosmetic evaporates after being applied to the skin had to be determined by human senses, but the degree of cool sensation can be quantitatively measured using the temperature change measuring sensor 1. Such a temperature change measuring sensor 1 can be used not only by cosmetic companies that manufacture cosmetics, but also has the advantage of being able to digitize and show consumers the degree of cool sensation felt by using the cosmetic.

[0082] FIG. 5 is a graph showing the degree of cool sensation felt over time measured by the change in resistance after a cosmetic material was applied to the temperature change measuring sensor 1.

[0083] Referring to FIG. 5, in the graph, k indicates an experimental example in which carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS) were used as the materials for the second composite material layer 30, and j indicates a comparative example in which only polydimethylsiloxane (PDMS) was used as the material for the second composite material layer 30.

[0084] In the graph, the x-axis represents time, and the y-axis represents the temperature change expressed as the resistance change. The peak value on the y-axis can be understood to represent the degree of cool sensation felt by a person.

[0085] In this embodiment, the temperature change measuring sensor 1 is formed of a second composite material layer 30 made of the above-mentioned material, thereby increasing the thermal conductivity and enabling the temperature change to be measured in units of seconds (s).

[0086] For example, when the second composite layer 30 is made of carbon nanotubes (CNT) and polydimethylsiloxane (PDMS), and a cosmetic sample to be applied to the second composite layer 30 is measured using a mixture of water, thickener, and polyol in a preset ratio, the degree of cool sensation measured by the temperature change sensor 1 is 1.047 (R / R 0 5, the range of 0 to 70 seconds (s) is the time it takes for the temperature change measuring sensor 1 to stabilize, and it can be understood that the cosmetic sample is applied to the upper part of the temperature change measuring sensor 1 at the time it reaches 70 seconds (s) when the temperature change measuring sensor 1 stabilizes. In other words, after the cosmetic sample is evenly applied to the upper part of the temperature change measuring sensor 1, the peak value of 1.047 (R / R 0It can be understood that the time required for the cool sensation to reach R / R is 10 seconds (s). In addition, when the experiment was conducted under the same conditions but using only PDMS as the material of the second composite material layer 30, the degree of cool sensation was 1.045 (R / R 0 ) can be shown.

[0087] That is, when carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS) are used as the material of the second composite material layer 30, the temperature change can be sensed more sensitively than when only PDMS is used.

[0088] FIG. 6 is a graph showing the change in resistance measured when an external force (pressure) is applied to the temperature change amount measuring sensor 1 of FIG.

[0089] FIG. 6m is a graph of an embodiment showing a change in resistance with a change in external force when the first electrode 210 and the second electrode 220 are arranged on the same plane as in FIG.

[0090] FIG. 6n is a graph of a comparative example showing the change in resistance associated with a change in external force when two electrodes are arranged on different planes (when laminated between first composite material layers 10).

[0091] While a user is applying a cosmetic to the temperature change measuring sensor 1, a pressure change may occur when the user touches the temperature change measuring sensor 1. However, in this embodiment, the first electrode 210 and the second electrode 220 are arranged on the same plane, so that the temperature change measuring sensor 1 can measure only the temperature change regardless of the pressure change. This result can be confirmed from the experimental result in graph m of FIG. 6, where the resistance value is constant regardless of the pressure change.

[0092] FIG. 7 illustrates a schematic diagram of a matching system 1000 that can compare values ​​relating to coolness measured by the temperature change measuring sensor 1 of FIG. 1 with values ​​relating to coolness measured by an expert panel, and FIG. 8 is a graph showing a comparison between values ​​relating to coolness measured by the temperature change measuring sensor 1 of FIG. 1 and values ​​relating to coolness sensed by an expert panel.

[0093] 7 and 8, the matching system 1000 may include a temperature change measuring sensor 1 capable of indicating a temperature change amount as a change amount of resistance, a server 3 capable of comparing a value relating to coolness measured by the temperature change measuring sensor 1 with a value relating to coolness input from a panel terminal 2, and a panel terminal 2 into which a value relating to coolness measured by an expert panel is input and transmitted to the server 3. Here, the temperature change measuring sensor 1, the server 3, and the panel terminal 2 may transmit and receive data by wirelessly or wiredly communicating with each other through a communication network.

[0094] The server 3 can convert the amount of change in resistance measured by the temperature change measuring sensor 1 into a first numerical value related to the cool feeling that has already been set.

[0095] The server 3 can compare the second value relating to the cool feeling input from the panel terminal 2 with the first value converted from the amount of change in resistance measured by the temperature change measuring sensor 1 and display the result.

[0096] The matching system 1000 may also include a database 4 that stores a correlation between the amount of change in resistance and the first value. For example, the amount of change in resistance (R / R 0 ) may indicate a range between 1.00 and 1.50, and the first numerical value, which is the corresponding degree of coolness, may be quantified as 5.0 to 10.0 and stored in the database 4. Here, the first numerical value may be set to correspond to existing evaluation standards for coolness.

[0097] In addition, the server 3 may update the data stored in the database 4 regarding the correlation between the amount of change in resistance and the first value. Here, the server 3 may update the data regarding the amount of change in resistance (R / R 0 ) can be analyzed through machine learning, and the data stored in database 4 can be updated to reflect the results of such analysis.

[0098] The process of matching and comparing the result value regarding the cool sensation measured by the temperature change measuring sensor 1 and the result value regarding the cool sensation input from the panel terminal 2 through the matching system 1000 of this embodiment will be described as follows.

[0099] The degree of cool sensation caused by evaporation of the cosmetic can be measured by the temperature change amount measuring sensor 1 as the change amount of resistance, and the change amount of resistance can be transmitted to the server 3. Thereafter, the server 3 calculates the change amount of resistance (for example, 1.2(R / R 0 )) can be converted to a cooling sensation result value (e.g., 7.0).

[0100] The resultant value of the cooling sensation measured by the expert panel (e.g., 7.0(R / R 0 )) may be input to the panel terminal 2, and the result value of the coolness sensation input to the panel terminal 2 may be transmitted to the server 3.

[0101] Thereafter, the server 3 may compare and display the degree of coolness measured by the temperature change measuring sensor 1 and the degree of coolness input from the panel terminal 2. In this case, the matching system 1000 may further include a display device (not shown) capable of visually comparing and displaying the two values.

[0102] P shown in Fig. 8 indicates the result value of coolness sensation of 7 input from the panel terminal 2 and the result value of coolness sensation of 7 measured by the temperature change measuring sensor 1. Also, Q shown in Fig. 8 indicates the result value of coolness sensation of 9.4 input from the panel terminal 2 and the result value of coolness sensation of 9.3 measured by the temperature change measuring sensor 1. Thus, referring to Fig. 8, it can be seen that the degree of coolness sensation measured by the temperature change measuring sensor 1 and the degree of coolness sensation measured by the expert panel are almost the same.

[0103] Therefore, in the embodiment of the present invention, it is possible to obtain a result of a cool feeling that meets the existing evaluation criteria by matching the degree of cool feeling measured by the temperature change measuring sensor 1 with the degree of cool feeling measured by the expert panel through the matching system 1000. Hereinafter, the effect of the temperature change measuring sensor 1 according to the embodiment of the present invention will be described.

[0104] Conventionally, there was a problem that the degree of cool sensation caused by evaporation of a cosmetic after application to the skin had to be dependent on human senses, but the degree of cool sensation can be quantitatively measured using the temperature change measuring sensor 1 of this embodiment. Such a temperature change measuring sensor 1 can be used not only by cosmetic companies that manufacture cosmetics, but also has the advantage of being able to digitize and show the degree of cool sensation felt by consumers when using the cosmetic.

[0105] In addition, when the degree of refreshing sensation of various cosmetic ingredients is quantified using the temperature change amount measuring sensor 1, a database on refreshing sensation can be constructed.

[0106] Furthermore, by forming the second composite material layer 30 of the temperature change measuring sensor 1 from a composite material with high thermal conductivity, when a cosmetic material is applied to the upper side of the second composite material layer 30, the degree of temperature change associated with the evaporation of the cosmetic material can be quickly transmitted to the first composite material layer 10.

[0107] In other words, by providing the second composite material layer 30 with a composite material having high thermal conductivity, the degree of cool sensation caused by the evaporation of the cosmetic can be effectively transmitted.

[0108] Furthermore, by forming the second composite material layer 30 to have a small thickness, the temperature change caused by the evaporation of the cosmetic material can be effectively transmitted.

[0109] In addition, by arranging the first electrode 210 and the second electrode 220 of the electrode layer 20 on the same plane, the temperature change occurring in the temperature change measurement sensor 1 can be measured regardless of the force (pressure) applied to the temperature change measurement sensor 1.

[0110] The first horizontal electrodes 214 and the second horizontal electrodes 224 are arranged alternately with each other, so that the amount of temperature change occurring in the entire temperature change measuring sensor 1 can be measured more precisely.

[0111] In addition, when the second composite material layer 30 is formed of carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS) with the weight ratio of carbon nanotubes (CNTs) being 15% to 20%, there is an advantage that the thermal conductivity of the second composite material layer 30 can be further increased.

[0112] The following is a description of an embodiment of the present invention.

[0113] Item 1 may provide a temperature change measurement sensor including: a first composite material layer including a polymer whose volume changes in response to a temperature change; an electrode layer provided on one side of the first composite material layer and capable of indicating the temperature change by a change in resistance; and a second composite material layer, at least a portion of which is provided on an upper side of the first composite material layer and includes at least one of carbon nanotubes (CNTs), boron nitride nanotubes (BNNTs), and graphene, and polydimethylsiloxane (PDMS), or includes a thermoplastic polyurethane elastomer (Thermoplastic PolyUrethane, TPU), so as to transmit a temperature change occurring on one side to the other side.

[0114] Item 2 may provide the temperature change measuring sensor of item 1, wherein the second composite material layer has a thickness of 1 μm to 30 μm.

[0115] Item 3 provides the temperature change measurement sensor of items 1 and 2, wherein the second composite material layer is formed of carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS), and the weight ratio of the carbon nanotubes (CNTs) is 15% to 20%.

[0116] Item 4 may provide the temperature change measurement sensor of Items 1 to 3, in which the second composite material layer is formed of a thermoplastic polyurethane elastomer (Thermoplastic PolyUrethane, TPU) and has a thickness of 1 μm to 10 μm.

[0117] Item 5 provides a temperature change measuring sensor according to Items 1 to 4, in which the electrode layer includes a first electrode arranged on one upper side of the first composite material layer and a second electrode spaced apart from the first electrode, and the first electrode and the second electrode are arranged on the same plane.

[0118] Item 6 may provide a temperature change measurement sensor according to items 1 to 5, in which the first electrode includes a first vertical electrode arranged in one direction and a plurality of first horizontal electrodes extending from the first vertical electrode at a predetermined angle, the second electrode includes a second vertical electrode arranged in one direction and a plurality of second horizontal electrodes extending from the second vertical electrode at a predetermined angle, and the plurality of first horizontal electrodes and the plurality of second horizontal electrodes are arranged alternately and parallel to each other.

[0119] Item 7 is a temperature change measuring sensor according to any one of Items 1 to 6, in which the second composite material layer contacts the first electrode and the second electrode, and also contacts the first composite material layer between the first electrode and the second electrode.

[0120] Item 8 can provide a temperature change measurement sensor according to Items 1 to 7, in which an upper surface of the second composite material layer is flat, and a lower surface of the second composite material layer is provided with a protrusion that fills the gap between the first electrode and the second electrode.

[0121] Item 9 may provide the temperature change measurement sensor according to Items 1 to 8, wherein the first composite material layer includes polyvinylidene fluoride (PVDF), graphene oxide (rGO), and a semi-crystalline polymer mixed with polyvinylidene fluoride (PVDF) and graphene oxide (rGO).

[0122] Item 10 can provide the temperature change measurement sensor according to Items 1 to 9, wherein the semi-crystalline polymer is polyethylene oxide (PEO).

[0123] Item 11 may provide a matching system including a server capable of converting the resistance change measured by the temperature change measuring sensor of items 1 to 10 into a first preset value related to cool sensation, and the server may compare and display a second value related to cool sensation input from a panel terminal with the first value.

[0124] Item 12 may provide the matching system of item 11, wherein the matching system includes a database storing a correlation between the amount of change in resistance and the first numerical value, and the correlation between the amount of change in resistance and the first numerical value can be updated by the server.

[0125] Although the temperature change measurement sensor according to the embodiment of the present invention has been described above using a specific embodiment, this is merely an example, and the present invention is not limited thereto, and should be interpreted as having the widest scope based on the basic idea disclosed in this specification. Those skilled in the art may combine and replace the disclosed embodiments to implement embodiments not shown, but this also does not deviate from the scope of the present invention. In addition, those skilled in the art may easily modify or change the embodiments disclosed based on this specification, and it is clear that such modifications and changes also fall within the scope of the present invention. [Industrial Applicability]

[0126] The present invention can be used in the field of sensors for measuring temperature change amounts.

Claims

1. a first composite material layer including a polymer that changes volume in response to a change in temperature; an electrode layer provided on one side of the first composite material layer, the electrode layer being capable of indicating the temperature change by a change in resistance; a second composite layer, at least a portion of which is provided on the upper side of the first composite layer, and which includes at least one of carbon nanotubes (CNTs), boron nitride nanotubes (BNNTs), and graphene, and polydimethylsiloxane (PDMS), or includes thermoplastic polyurethane elastomer (Thermoplastic PolyUrethane, TPU), so as to transmit a temperature change occurring on one side to the other side; The second composite material layer is It is made of carbon nanotubes (CNTs) and polydimethylsiloxane (PDMS), The weight ratio of the carbon nanotubes (CNTs) is 15% to 20%.

2. The temperature change measuring sensor according to claim 1 , wherein the second composite material layer has a thickness of 1 μm to 30 μm.

3. The second composite material layer is 2. The temperature change measurement sensor according to claim 1, wherein the second composite material layer is made of a thermoplastic polyurethane (TPU) and has a thickness of 1 μm to 10 μm.

4. The electrode layer is a first electrode disposed on one side of an upper portion of the first composite material layer; a second electrode spaced apart from the first electrode, The temperature change measuring sensor according to claim 1 , wherein the first electrode and the second electrode are disposed on the same plane.

5. The first electrode is A first vertical electrode arranged in one direction; a plurality of first horizontal electrodes extending at a predetermined angle from the first vertical electrodes; The second electrode is A second vertical electrode arranged in one direction; a plurality of second horizontal electrodes extending at a predetermined angle from the second vertical electrodes; 5. The temperature change measurement sensor according to claim 4, wherein the first horizontal electrodes and the second horizontal electrodes are alternately arranged and parallel to each other.

6. The second composite material layer is The temperature change measuring sensor of claim 4 , in contact with the first electrode and the second electrode, and in contact with the first composite layer between the first electrode and the second electrode.

7. the top surface of the second composite material layer is planar; The temperature change measuring sensor according to claim 4 , wherein a lower surface of the second composite material layer is provided with a protrusion that fills a gap between the first electrode and the second electrode.

8. The first composite material layer comprises:

10. The temperature change sensor of claim 1, comprising polyvinylidene fluoride (PVDF), graphene oxide (rGO), and a semi-crystalline polymer mixed with polyvinylidene fluoride (PVDF) and graphene oxide (rGO).

9. 9. The temperature change measuring sensor according to claim 8, wherein the semi-crystalline polymer is polyethylene oxide (PEO).

10. a server capable of converting the amount of change in resistance measured by the temperature change measuring sensor according to claim 1 into a first value related to a feeling of freshness that has already been set; The server, A matching system capable of comparing a second value relating to a refreshing sensation inputted from a panel terminal with the first value and displaying the result.

11. The matching system includes: a database storing a correlation between the amount of change in resistance and the first value; The matching system of claim 10 , wherein the server is capable of updating the correlation between the amount of change in resistance and the first numerical value.

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