WO2024122748A1 - Ion conductor, comprising ion liquid, for pressure sensor and pressure sensor comprising same - Google Patents

Abstract

The present invention relates to an ion conductor, comprising an ion liquid, for a pressure sensor and a pressure sensor comprising same. More specifically, the ion conductor comprises an appropriate content of an ion liquid, so that a pressure sensor comprising same has superior performance.

Description

Ion conductor for pressure sensor containing ionic liquid and pressure sensor containing same

The present invention relates to an ion conductor for a pressure sensor containing an ionic liquid and a pressure sensor containing the same. More specifically, the ion conductor contains an appropriate amount of ionic liquid, so that a pressure sensor containing the same has excellent performance. There is something special about having it.

The human skin is a collection of various sensory organs that sense various external stimuli such as mechanical, chemical, and thermal, and allow humans to perceive them. A flexible, lightweight electronic device that can mimic and replace the functions of skin is called electronic skin, and it consists of various types of sensors such as pressure sensors, chemical sensors, strain sensors, and temperature sensors. In particular, electronic skin pressure sensors are a field that is receiving a lot of attention as they can be applied to fields such as prosthetics, robots, and health monitoring. Depending on the operating principle, it can be classified into capacitive, resistive, optical, and piezoelectric.

Through consistent research, domestic researchers have succeeded in implementing a flexible and lightweight pressure sensor. This is a resistive pressure sensor that produces a fine hemispherical pattern using a composite of flexible elastomers and carbon nanotubes, and interlocks them so that the contact area between the two electrodes changes depending on the pressure (ACS Nano 2014, 8, 4689). In addition, a resistive pressure sensor coated with PEDOT:PSS composite, a conductive polymer, on the surface of a flexible elastomer in a fine pyramid pattern has been reported (Adv. Mater. 2014, 26, 3451-3458).

Meanwhile, numerous studies are being conducted to implement various capacitive, resistive, optical, and piezoelectric sensors described above. Accordingly, while researching for the above implementation, the present inventors derived the appropriate content of the ionic liquid contained in the ion conductor for the pressure sensor and the plasticizer contained in the dielectric, so that the pressure sensor containing it was a capacitive sensor and a resistance sensor. The present invention was completed by discovering that it can be used as an optical sensor and a dual-mode sensor.

The present invention provides an ion conductor for a pressure sensor containing an ionic liquid.

Additionally, the present invention provides a pressure sensor including the ion conductor for the pressure sensor.

Additionally, the present invention provides a method for manufacturing the pressure sensor.

As a technical means for achieving the above-described technical problem, one aspect of the present invention is,

An ion conductor for a pressure sensor comprising a polymer resin, a plasticizer, and an ionic liquid is provided.

The polymer resins include polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), polyurethane (PU), polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), polyvinyl alcohol (PVA), and polyvinyl chloride (PVC). It may contain a polymer resin selected from the group consisting of vinylpyrrolidone (PVP), polyethylene oxide (PEO), polyimide (PI), polyethylene terephthalate (PET), and combinations thereof.

The plasticizer may include a plasticizer selected from the group consisting of ester plasticizer, phthalate plasticizer, and combinations thereof.

The ester plasticizers include dibutyl adipate (DBA), di-2-ethylhexyl adipate (DOA), diisobutyl adipate (DIBA), adipic acid ester, adipic acid polyester, and tri-2-ethyl. It may contain a plasticizer selected from the group consisting of hexyl trimellitate (TOTM), triisononyl trimellitate (TINTM), and combinations thereof.

The phthalate-based plasticizer is a plasticizer selected from the group consisting of di-2-ethylhexyl phthalate (DOP), dibutyl phthalate (DBP), diheptyl phthalate (DHP), diisodecyl phthalate (DIDP), and combinations thereof. It may include

The ionic liquid may include an ionic liquid selected from the group consisting of a neutral liquid, anionic liquid, cationic liquid, and combinations thereof.

The neutral liquid is 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (Emim TFSI), 1-butyl-3-methyl Imidazolium bis(trifluoromethylsulfonyl)imide (1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, Bmim TFSI), 1-Butyl-3-methylimidazolium hexafluorophosphate (1-Butyl -3-methylimidazolium hexafluorophosphate, Bmim PF ₆ ), 1-Ethyl-3-methylimidazolium tetrafluoroborate, Emim BF ₄ ), 1-methyl-3-propylimidazolium Iodide (1-methyl-3-propylimidazolium iodide, MPII), 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITf), 1-ethyl-3 -Methylimidazolium hydrogen sulfate (1-ethyl-3-methylimidazolium hydrogensulfate, EMIHSO ₄ ), N-methyl-N-butylpyrrolidinium bis(trifluoromethanesulfonyl) imide (N-methyl-N- It may contain a neutral liquid selected from the group consisting of butylpyrrolidinium bis(trifluoromethanesulfonyl) imide, PYRTFSI) and combinations thereof.

The anionic liquid includes trifluoroacetate ([tfa] ^- ), trifluoromethanesulfonate ([CF ₃ SO ₃ ] ^- ), and bis (fluorosulfonyl)imide (bis ( fluorosulfonyl)imide)([N(SO ₂ F) ₂ ] ^- ), bis(trifluoromethanesulfonyl)imide ([N(SO ₂ CF ₃ ) ₂ ] ^- ), DC Dicyanamide ([N(CN) ₂ ] ^- ), tetracyanoborate ([B(CN) ₄ ] ^- ), dihydrogenphosphate ([H ₂ PO ₄ ] ^- ) , hydrogen sulfate ([HSO ₄ ] ^- ), and combinations thereof.

The cationic liquid includes a cationic liquid selected from the group consisting of imidazolium, pyrrolidinium, piperidinium, alkylmethylimidazolium, and combinations thereof. It may be.

The content of the ionic liquid may be 20 to 240 parts by weight based on 100 parts by weight of the polymer resin.

The content of the ionic liquid may be 60 to 160 parts by weight based on 100 parts by weight of the polymer resin.

In addition, another aspect of the present invention is,

A conductive layer including an ion conductor for the pressure sensor; and a dielectric layer; wherein the conductive layer includes a first conductive layer and a second conductive layer, and the dielectric layer is interposed between the first conductive layer and the second conductive layer. Provides a pressure sensor.

The dielectric layer may include a polymer resin and a plasticizer.

The content of the plasticizer may be 100 to 2,000 parts by weight based on 100 parts by weight of the polymer resin.

In addition, another aspect of the present invention is,

A method of manufacturing the pressure sensor, comprising: interposing a dielectric layer between the first conductive layer and the second conductive layer; and bonding the surface of the dielectric layer to the first conductive layer and the second conductive layer by treating the surface of the dielectric layer with a solvent.

Since the ion conductor for a pressure sensor according to the present invention as described above has excellent ionic conductivity by containing an ionic liquid, it can be utilized as an electrode layer (conductive layer) of a pressure sensor.

In addition, the dielectric according to the present invention has an excellent dielectric constant value by including a plasticizer, so it can be used as a dielectric layer of a pressure sensor.

In addition, the pressure sensor including the electrode layer and the dielectric layer can be used as a capacitive pressure sensor because the change in capacitance is large as the pressure increases, and the resistance because the thickness and surface area change as the pressure increases. It may also be used as a piezo-resistive pressure sensor.

1 is a schematic diagram showing a method of manufacturing an ion conductor for a pressure sensor according to an embodiment of the present invention.

Figure 2 is a schematic diagram showing a method of manufacturing a pressure sensor according to an embodiment of the present invention.

Figure 3 is a graph showing the ionic conductivity of an ion conductor for a pressure sensor according to an embodiment of the present invention.

Figure 4 is a graph showing the dielectric constant value of a dielectric according to an embodiment of the present invention.

5 to 8 are graphs showing the characteristics of a pressure sensor according to an embodiment of the present invention, respectively.

Hereinafter, the present invention will be described in more detail. However, the present invention can be implemented in various different forms, and the present invention is not limited to the embodiments described herein, and the present invention is only defined by the claims to be described later.

In addition, the terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In the entire specification of the present invention, 'including' a certain element means that other elements may be further included rather than excluding other elements, unless specifically stated to the contrary.

The first aspect of the present application is,

An ion conductor for a pressure sensor comprising a polymer resin, a plasticizer, and an ionic liquid is provided.

Hereinafter, the ion conductor for a pressure sensor according to the first aspect of the present application will be described in detail.

In one embodiment of the present application, the ion conductor for a pressure sensor may include a polymer resin. At this time, the polymer resin may be a non-aqueous based polymer, and accordingly, the ion conductor for the pressure sensor may have long-term stability without change in weight or volume.

In one embodiment of the present application, the polymer resin can be plasticized without a solvent, and includes polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), polyurethane (PU), and polymethyl methacrylate (PMMA). ), polydimethylsiloxane (PDMS), polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyimide (PI), polyethylene terephthalate (PET), and combinations thereof. It may contain a polymer resin selected from the group, and preferably may contain polyvinyl chloride (PVC).

In one embodiment of the present application, the plasticizer is a substance that plasticizes the polymer resin at a constant temperature and may have a flash point of 200°C or higher. This allows polymer resins and plasticizers to be stably melted without solvents.

In one embodiment of the present application, the plasticizer may include a plasticizer selected from the group consisting of an ester plasticizer, a phthalate plasticizer, and combinations thereof.

At this time, the ester plasticizer is dibutyl adipate (DBA), di-2-ethylhexyl adipate (DOA), diisobutyl adipate (DIBA), adipic acid ester, adipic acid polyester, and tri-2. -It may contain a plasticizer selected from the group consisting of ethylhexyl trimellitate (TOTM), triisononyl trimellitate (TINTM), and combinations thereof. In addition, the phthalate-based plasticizer is selected from the group consisting of di-2-ethylhexyl phthalate (DOP), dibutyl phthalate (DBP), diheptyl phthalate (DHP), diisodecyl phthalate (DIDP), and combinations thereof. It may contain a plasticizer. Meanwhile, the plasticizer may preferably be an ester plasticizer, and more preferably dibutyl adipate (DBA).

Meanwhile, according to one embodiment of the present invention, the plasticizer may be di-butyl adipate (DBA), and the dibutyl adipate may be represented by the following formula (1).

[Formula 1]

In one embodiment of the present application, the ionic liquid refers to a liquid containing ions, and may include, for example, a neutral liquid, anionic liquid, or cationic liquid.

In one embodiment of the present application, the neutral liquid is 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (Emim TFSI). , 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (Bmim TFSI), 1-Butyl-3-methylimidazolium Hexafluorophosphate (1-Butyl-3-methylimidazolium hexafluorophosphate, Bmim PF ₆ ), 1-Ethyl-3-methylimidazolium tetrafluoroborate (Emim BF ₄ ), 1- 1-methyl-3-propylimidazolium iodide (MPII), 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, EMITf), 1-ethyl-3-methylimidazolium hydrogensulfate (EMIHSO ₄ ), N-methyl-N-butylpyrrolidinium bis(trifluoromethanesulfonyl) already It may contain a neutral liquid selected from the group consisting of (N-methyl-N-butylpyrrolidinium bis(trifluoromethanesulfonyl) imide, PYRTFSI) and combinations thereof, preferably 1-ethyl-3-methylimidazolium. 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, Emim TFSI, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, Bmim TFSI), 1-Butyl-3-methylimidazolium hexafluorophosphate, Bmim PF ₆ ) or 1-ethyl -3-Methylimidazolium tetrafluoroborate (1-Ethyl-3-methylimidazolium tetrafluoroborate, Emim BF ₄ ) may be used.

In one embodiment of the present application, the anionic liquid is trifluoroacetate ([tfa] ^- ), trifluoromethanesulfonate ([CF ₃ SO ₃ ] ^- ), bis (fluoro Sulfonyl)imide (bis(fluorosulfonyl)imide)([N(SO ₂ F) ₂ ] ^- ), bis(trifluoromethanesulfonyl)imide)([N(SO ₂ CF ₃ ) ₂ ] ^- ), Dicyanamide ([N(CN) ₂ ] ^- ), tetracyanoborate ([B(CN) ₄ ] ^- ), dihydrogenphosphate ( It may include an anionic liquid selected from the group consisting of [H ₂ PO ₄ ] ^- ), hydrogen sulfate ([HSO ₄ ] ^- ), and combinations thereof.

In one embodiment of the present application, the cationic liquid is a group consisting of imidazolium, pyrrolidinium, piperidinium, alkylmethylimidazolium, and combinations thereof. It may contain a cationic liquid selected from.

Meanwhile, according to one embodiment of the present invention, the ionic liquid is 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, Emim TFSI), which may be represented by the following formula (2).

[Formula 2]

In one embodiment of the present application, relative to 100 parts by weight of the polymer resin, the content of the ionic liquid is 20 parts by weight to 240 parts by weight, and the content of the plasticizer is 100 parts by weight to 2,000 parts by weight, preferably 300 parts by weight. parts by weight to 1,500 parts by weight, and preferably, the content of the ionic liquid is 60 parts by weight to 160 parts by weight, and the content of the plasticizer may be 500 parts by weight to 900 parts by weight.

Meanwhile, according to one embodiment of the present invention, the weight mixing ratio of the polymer resin, plasticizer, and ionic liquid may be 1:9:0.6 to 1.6. If the content of the ionic liquid is less than 20 parts by weight compared to 100 parts by weight of the polymer resin, the problem of lowering ionic conductivity may occur because the content of the ionic liquid is too small, and if it exceeds 240 parts by weight, more specifically, 160 parts by weight. If it exceeds this level, leakage may occur when used as an electrode layer (conductive layer) of a pressure sensor, which may cause a problem of deterioration of mechanical properties.

The second aspect of the present application is,

A conductive layer including an ion conductor for a pressure sensor according to the first aspect of the present application; and a dielectric layer; wherein the conductive layer includes a first conductive layer and a second conductive layer, and the dielectric layer is interposed between the first conductive layer and the second conductive layer. Provides a pressure sensor.

Detailed description of parts overlapping with the first aspect of the present application has been omitted, but the content described in the first aspect of the present application can be applied equally even if the description is omitted in the second aspect.

Hereinafter, the pressure sensor according to the second aspect of the present application will be described in detail.

In one embodiment of the present application, the pressure sensor may include a first conductive layer and a second conductive layer, and the first conductive layer and the second conductive layer may be used as electrode layers, respectively.

In one embodiment of the present application, the first conductive layer and the second conductive layer including the ion conductor for a pressure sensor according to the first aspect of the present application are positioned to face each other, and the dielectric layer includes the first conductive layer and the second conductive layer. It may be interposed between the second conductive layers. At this time, the dielectric layer may include a dielectric, and the dielectric may include a polymer resin and a plasticizer.

In one embodiment of the present application, the polymer resin can be plasticized without a solvent, and includes polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), polyurethane (PU), and polymethyl methacrylate (PMMA). ), polydimethylsiloxane (PDMS), polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), polyimide (PI), polyethylene terephthalate (PET), and combinations thereof. It may contain a polymer resin selected from the group, and preferably may contain polyvinyl chloride (PVC).

In one embodiment of the present application, the plasticizer is a substance that plasticizes the polymer resin at a constant temperature and may have a flash point of 200°C or higher. Meanwhile, the polymer resin and plasticizer may be mixed using a solvent such as tetrahydrofuran (THF).

In one embodiment of the present application, the plasticizer may include a plasticizer selected from the group consisting of ester plasticizer, phthalate plasticizer, and combinations thereof, and according to one embodiment of the present invention, dibutyl adipate ( It may contain dibutyl adipate (DBA).

In one embodiment of the present application, the content of the plasticizer included in the dielectric may be 100 parts by weight to 2,000 parts by weight, preferably 500 parts by weight to 900 parts by weight, based on 100 parts by weight of the polymer resin. If the content of the plasticizer is less than 100 parts by weight relative to 100 parts by weight of the polymer resin, a problem may occur in which the dielectric constant value is lowered, and if it exceeds 2,000 parts by weight, more specifically, if it exceeds 900 parts by weight, when pressure is applied , problems with deterioration of mechanical properties may occur.

In one embodiment of the present application, the pressure sensor can be used as a capacitive pressure sensor because the change in capacitance is large as the pressure increases, and the thickness and surface area change as the pressure increases, so the pressure sensor can be used as a capacitive pressure sensor. It may also be used as a piezo-resistive pressure sensor.

The third aspect of the present application is,

A method of manufacturing a pressure sensor according to the second aspect of the present application, comprising: interposing a dielectric layer between the first conductive layer and the second conductive layer; and bonding the surface of the dielectric layer to the first conductive layer and the second conductive layer by treating the surface of the dielectric layer with a solvent.

Detailed description of parts overlapping with the first and second aspects of the present application has been omitted, but the content described in the first and second aspects of the present application can be applied equally even if the description is omitted in the third aspect. .

Hereinafter, the manufacturing method of the pressure sensor according to the third aspect of the present application will be described in detail.

First, in one embodiment of the present application, the method of manufacturing the pressure sensor may include interposing a dielectric layer between the first conductive layer and the second conductive layer.

In one embodiment of the present application, as shown in FIG. 2, the dielectric layer may be interposed between the first conductive layer and the second conductive layer, and has an excellent dielectric constant value and thus a capacitance value. It can also be excellent. Meanwhile, the first conductive layer and the second conductive layer may be used as electrode layers because they have excellent ionic conductivity.

Next, in one embodiment of the present application, the method of manufacturing the pressure sensor may include bonding the surface of the dielectric layer to the first conductive layer and the second conductive layer by treating the surface of the dielectric layer with a solvent.

In one embodiment of the present application, the conductive layer and the dielectric layer may each have a gel form, and by treating the surface of the dielectric layer with a solvent, the gel surface of the dielectric layer is melted and bonded to the conductive layer. It could be. At this time, the type of solvent is not greatly limited, but for example, tetrahydrofuran (THF) may be used.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement it. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

Preparation Example 1. Preparation of ion conductor

As shown in Figure 1, polyvinyl chloride (PVC) was added and dissolved in 25 mL of tetrahydrofuran (THF), which was stirred at 400 rpm with a magnetic bar. Dibutyl adipate (DBA), a plasticizer, and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (Emim TFSI), an ionic liquid, were added to the solution and incubated for 12 hours. It was stirred sufficiently for a while. Afterwards, the solution was poured into a Petri dish and dried sufficiently at room temperature for 48 hours to prepare an ion conductor.

At this time, the weight mixing ratio of PVC, DBA, and Emim TFSI was 1: 9: 0.6.

Preparation Example 2. Preparation of ion conductor

An ion conductor was manufactured in the same manner as in Preparation Example 1, except that the weight mixing ratio of PVC, DBA, and Emim TFSI was changed to 1: 9: 1.0.

Preparation Example 3. Preparation of ion conductor

An ion conductor was manufactured in the same manner as in Preparation Example 1, except that the weight mixing ratio of PVC, DBA, and Emim TFSI was changed to 1: 9: 1.2.

Preparation Example 4. Preparation of ion conductor

An ion conductor was manufactured in the same manner as in Preparation Example 1 except that the weight mixing ratio of PVC, DBA, and Emim TFSI was changed to 1: 9: 1.4.

Preparation Example 5. Preparation of ion conductor

An ion conductor was manufactured in the same manner as in Preparation Example 1 except that the weight mixing ratio of PVC, DBA, and Emim TFSI was changed to 1: 9: 1.6.

Preparation Example 6. Preparation of ion conductor

An ion conductor was manufactured in the same manner as in Preparation Example 1 except that the weight mixing ratio of PVC, DBA, and Emim TFSI was changed to 1: 9: 1.8.

Preparation Example 7. Preparation of dielectric

In Preparation Example 1, without adding the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (Emim TFSI), the weight mixing ratio of PVC and DBA was 1: A dielectric was manufactured using 1.

Preparation Example 8. Preparation of dielectric

The dielectric was manufactured in the same manner as in Preparation Example 7 except that the weight mixing ratio of PVC and DBA was changed to 1:2.

Preparation Example 9. Preparation of dielectric

The dielectric was manufactured in the same manner as in Preparation Example 7 except that the weight mixing ratio of PVC and DBA was changed to 1:3.

Preparation Example 10. Preparation of dielectric

The dielectric was manufactured in the same manner as in Preparation Example 7 except that the weight mixing ratio of PVC and DBA was changed to 1:5.

Preparation Example 11. Preparation of dielectric

The dielectric was manufactured in the same manner as in Preparation Example 7 except that the weight mixing ratio of PVC and DBA was changed to 1:7.

Preparation Example 12. Preparation of dielectric

The dielectric was manufactured in the same manner as in Preparation Example 7 except that the weight mixing ratio of PVC and DBA was changed to 1:9.

Example 1. Manufacturing of pressure sensor (DBA5/IL0.6)

As shown in Figure 2, the conductive layer containing the ion conductor prepared in Preparation Example 1 is placed at the top and bottom, respectively, and the dielectric layer containing the dielectric prepared in Preparation Example 10 is placed in the center, and then The dielectric layer was bonded to the conductive layer by lightly melting it with THF.

Afterwards, to connect the LCR meter, the wire was inserted all the way into each of the upper and lower conductive layers, and the LCR meter was connected.

Example 2. Manufacturing of pressure sensor (DBA9/IL0.6)

A pressure sensor was manufactured in the same manner as in Example 1, except that the dielectric prepared in Preparation Example 12 was used as the dielectric.

Example 3. Manufacturing of pressure sensor (DBA5/IL1.2)

A pressure sensor was manufactured in the same manner as in Example 1, except that the ion conductor prepared in Preparation Example 3 was used as the ion conductor.

Example 4. Manufacturing of pressure sensor (DBA9/IL1.2)

A pressure sensor was manufactured in the same manner as in Example 3, except that the dielectric prepared in Preparation Example 12 was used as the dielectric.

Example 5. Manufacturing of pressure sensor (DBA5/IL1.6)

A pressure sensor was manufactured in the same manner as in Example 1, except that the ion conductor prepared in Preparation Example 5 was used as the ion conductor.

Example 6. Manufacturing of pressure sensor (DBA9/IL1.6)

A pressure sensor was manufactured in the same manner as in Example 5, except that the dielectric prepared in Preparation Example 12 was used as the dielectric.

Experimental Example 1. Confirmation of characteristics of ion conductor

The ionic conductivity of the ion conductors prepared in Preparation Examples 1 to 6 was measured, and the results are shown in FIG. 3.

As shown in Figure 3, it was confirmed that ionic conductivity increased as the content of ionic liquid increased, and thus it was confirmed that it could be used as an electrode layer of a pressure sensor.

However, in the case of Preparation Example 6, where the content of the ionic liquid was the highest, it was confirmed that if the content of the ionic liquid was increased beyond the composition, the mechanical properties could be greatly reduced, so problems could arise when using it as an electrode layer of a pressure sensor.

Experimental Example 2. Confirmation of dielectric properties

The dielectric constants of the dielectrics prepared in Preparation Examples 7 to 12 were measured, and the results are shown in FIG. 4.

As shown in Figure 4, it was confirmed that the dielectric constant value increased as the content of DBA, a plasticizer, increased. In addition, as the dielectric constant value increases, the capacitance value also increases, so it was confirmed that the composition of Preparation Example 12 is the optimal composition as a pressure sensor.

However, it was confirmed that if the content of the plasticizer increases beyond the composition of Preparation Example 12, the mechanical properties are greatly reduced when pressure is applied, which may cause problems when used as a pressure sensor.

Experimental Example 3. Checking the characteristics of the pressure sensor

The performance of the pressure sensors manufactured in Examples 1 to 6 was measured, and the results are shown in Figures 5 to 8, respectively.

As shown in Figures 5 to 8, as the pressure increases, the amount of change in capacitance is large, confirming that it can be used as a capacitive pressure sensor.

In addition, it was confirmed that it can be used as a piezo-resistive pressure sensor because the thickness and surface area change as pressure increases.

Above, the present invention has been described in detail along with preferred embodiments with reference to the drawings, but the scope of the technical idea of the present invention is not limited to these drawings and examples. Accordingly, various modifications or equivalent embodiments may exist within the scope of the technical idea of the present invention. Therefore, the scope of rights of the technical idea according to the present invention should be interpreted in accordance with the claims, and technical ideas within the scope equivalent or equivalent thereto should be interpreted as falling within the scope of the rights of the present invention.

Claims (15)

1. Ion conductor for pressure sensor containing polymer resin, plasticizer and ionic liquid.
2. According to paragraph 1,

   The polymer resins include polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), polyurethane (PU), polymethyl methacrylate (PMMA), polydimethylsiloxane (PDMS), polyvinyl alcohol (PVA), and polyvinyl chloride (PVC). An ion conductor for a pressure sensor comprising a polymer resin selected from the group consisting of vinylpyrrolidone (PVP), polyethylene oxide (PEO), polyimide (PI), polyethylene terephthalate (PET), and combinations thereof.
3. According to paragraph 1,

   The plasticizer is an ion conductor for a pressure sensor comprising a plasticizer selected from the group consisting of ester plasticizer, phthalate plasticizer, and combinations thereof.
4. According to paragraph 3,

   The ester plasticizers include dibutyl adipate (DBA), di-2-ethylhexyl adipate (DOA), diisobutyl adipate (DIBA), adipic acid ester, adipic acid polyester, and tri-2-ethyl. An ion conductor for a pressure sensor comprising a plasticizer selected from the group consisting of hexyl trimellitate (TOTM), triisononyl trimellitate (TINTM), and combinations thereof.
5. According to paragraph 3,

   The phthalate-based plasticizer is a plasticizer selected from the group consisting of di-2-ethylhexyl phthalate (DOP), dibutyl phthalate (DBP), diheptyl phthalate (DHP), diisodecyl phthalate (DIDP), and combinations thereof. An ion conductor for a pressure sensor, including:
6. According to paragraph 1,

   The ionic liquid is an ion conductor for a pressure sensor comprising an ionic liquid selected from the group consisting of a neutral liquid, anionic liquid, cationic liquid, and combinations thereof.
7. According to clause 6,

   The neutral liquid is 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (Emim TFSI), 1-butyl-3-methyl Imidazolium bis(trifluoromethylsulfonyl)imide (1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, Bmim TFSI), 1-Butyl-3-methylimidazolium hexafluorophosphate (1-Butyl -3-methylimidazolium hexafluorophosphate, Bmim PF ₆ ), 1-Ethyl-3-methylimidazolium tetrafluoroborate, Emim BF ₄ ), 1-methyl-3-propylimidazolium Iodide (1-methyl-3-propylimidazolium iodide, MPII), 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITf), 1-ethyl-3 -Methylimidazolium hydrogen sulfate (1-ethyl-3-methylimidazolium hydrogensulfate, EMIHSO ₄ ), N-methyl-N-butylpyrrolidinium bis(trifluoromethanesulfonyl) imide (N-methyl-N- An ion conductor for a pressure sensor comprising a neutral liquid selected from the group consisting of butylpyrrolidinium bis(trifluoromethanesulfonyl) imide, PYRTFSI) and combinations thereof.
8. According to clause 6,

   The anionic liquid includes trifluoroacetate ([tfa] ^- ), trifluoromethanesulfonate ([CF ₃ SO ₃ ] ^- ), and bis (fluorosulfonyl)imide (bis ( fluorosulfonyl)imide)([N(SO ₂ F) ₂ ] ^- ), bis(trifluoromethanesulfonyl)imide ([N(SO ₂ CF ₃ ) ₂ ] ^- ), DC Dicyanamide ([N(CN) ₂ ] ^- ), tetracyanoborate ([B(CN) ₄ ] ^- ), dihydrogenphosphate ([H ₂ PO ₄ ] ^- ) , hydrogen sulfate ([HSO ₄ ] ^- ), and combinations thereof. An ion conductor for a pressure sensor comprising an anionic liquid selected from the group consisting of.
9. According to clause 6,

   The cationic liquid includes a cationic liquid selected from the group consisting of imidazolium, pyrrolidinium, piperidinium, alkylmethylimidazolium, and combinations thereof. An ion conductor for a pressure sensor.
10. According to paragraph 1,

    The ionic liquid content is 20 to 240 parts by weight based on 100 parts by weight of the polymer resin.
11. According to paragraph 1,

    The ionic liquid content is 60 to 160 parts by weight based on 100 parts by weight of the polymer resin.
12. A conductive layer containing an ion conductor for a pressure sensor according to claim 1; and

    dielectric layer;

    Including,

    The conductive layer includes a first conductive layer and a second conductive layer,

    A pressure sensor wherein the dielectric layer is interposed between the first conductive layer and the second conductive layer.
13. According to clause 12,

    A pressure sensor wherein the dielectric layer includes a polymer resin and a plasticizer.
14. According to clause 13,

    A pressure sensor wherein the content of the plasticizer is 100 to 2,000 parts by weight based on 100 parts by weight of the polymer resin.
15. A method of manufacturing a pressure sensor according to paragraph 12,

    interposing a dielectric layer between the first conductive layer and the second conductive layer; and

    bonding the surface of the dielectric layer to the first conductive layer and the second conductive layer by treating the surface of the dielectric layer with a solvent;

    A method of manufacturing a pressure sensor comprising.

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