KR102328087B1 - Non-buried piezoelectric energy harvesting system, construction method thereof, and piezoelectric energy harvesting method using the same - Google Patents

Abstract

The present invention relates to a piezoelectric energy harvesting system constructed on a surface of a road in an unburied type without road excavation. The piezoelectric energy harvesting system is installed on a surface of a road in an unburied type without road excavation. The present invention relates to the unburied type piezoelectric energy harvesting system comprising a fluorine-based piezoelectric polymer layer manufactured from a piezoelectric paint composition including a fluorine-based piezoelectric polymer, an inorganic filler, a pigment and a solvent, a piezoelectric-based energy harvesting method for harvesting electrical energy from the same, and an installation method of the unburied type piezoelectric energy harvesting system.

Description

Non-buried piezoelectric energy harvesting system, construction method thereof, and piezoelectric energy harvesting method using the same, and piezoelectric energy harvesting method using same }

The present invention relates to an unburied piezoelectric energy harvesting system constructed using a paint composition, a construction method thereof, and a piezoelectric-based energy harvesting method using the same.

Energy harvesting refers to a technology for harvesting energy generated from natural energy sources such as sunlight, vibration, heat, and wind power by converting it into electrical energy.

Among them, the piezoelectric energy harvester proposed based on the piezoelectric effect is a mechanical energy harvester, such as vibration, bending, and load, generated by minute movements even when external renewable energy sources such as wind and sun are not provided. It is attracting attention as a next-generation energy generating device that can convert energy into electrical energy.

In particular, research to apply the technology to roads where it is advantageous to secure an energy source due to the movement of a fixed number of vehicles is increasing recently.

On the other hand, a representative ceramic piezoelectric material is Pb(ZrTi)O ₃ (PZT), and the polymer piezoelectric material is PVDF (Poly-vinylidene difluoride).

The mechanical-electrical coupling coefficient of the ceramic piezoelectric material, PZT, k = 0.5, which is greater than k = 0.2 of PVDF, but it is harder than polymer, so energy cannot be generated by little vibration, and it is easily broken and cannot be used for large deformation. There are disadvantages.

On the other hand, polymers are flexible and can be used for large displacements, but there is a disadvantage in that the electro-mechanical coupling coefficient is small.

Accordingly, it is necessary to review the optimal conditions for increasing the efficiency of converting mechanical energy into electrical energy from the material side and the mechanical device side, and most importantly, the amount of deformation (traffic load such as impact load) that occurs when applied to the road. ), and the material durability against extreme environmental changes (temperature and humidity changes) along the road should be reviewed first.

On the other hand, as a similar prior literature thereto, Korean Patent No. 10-1757109 has been proposed.

Republic of Korea Patent Publication No. 10-1757109 (2017.07.05)

An object of the present invention is to provide an unburied piezoelectric energy harvesting system that does not require road excavation and a construction method thereof.

One aspect of the present invention for achieving the above object is a piezoelectric energy harvesting system constructed on the surface of a road in an unburied type without road excavation, wherein the piezoelectric energy harvesting system includes a fluorine-based piezoelectric polymer, an inorganic filler, a pigment and a solvent. It relates to a non-buried piezoelectric energy harvesting system, characterized in that it comprises a fluorine-based piezoelectric polymer layer prepared from a piezoelectric coating composition comprising a.

In one aspect, the fluorine-based piezoelectric polymer layer may be prepared by coating a piezoelectric paint composition on an electrode during construction of a piezoelectric energy harvesting system and then drying it.

In one aspect, the fluorine-based piezoelectric polymer layer may be prepared by coating and drying a piezoelectric coating composition on a substrate to form a film, and then adhering a fluorine-based piezoelectric polymer film on an electrode.

In the above aspect, the electrode may be manufactured by applying a coating composition for an electrode on a road and drying the coating composition for a piezoelectric energy harvesting system during construction.

In the above aspect, the electrode may be a thin-film electrode bonded to the road.

In one aspect, the inorganic filler may be a ceramic filler, a carbon-based conductive filler, or a mixture thereof.

In addition, another aspect of the present invention relates to a piezoelectric-based energy harvesting method for harvesting electrical energy using the above-described non-buried piezoelectric energy harvesting system.

In addition, another aspect of the present invention relates to a method of constructing a non-buried piezoelectric energy harvesting system comprising the step of constructing the above-described non-buried piezoelectric energy harvesting system on a road.

In another aspect, the non-buried piezoelectric energy harvesting system may be constructed in a school zone or a weak power supply section.

The non-buried piezoelectric energy harvesting system according to the present invention may not damage the road as it can be constructed on the road surface without road excavation. In addition, it is good to reduce the time and cost for road excavation.

In addition, the fluorine-based piezoelectric polymer layer prepared from the piezoelectric paint composition according to the present invention has excellent impact resistance and high durability as it uses a fluorine-based piezoelectric polymer as a main component, unlike the conventional piezoelectric energy harvester for roads using ceramic as a main component, so it is not easily damaged. There is an advantage that energy can be harvested for a long period of time.

In addition, the method of forming the fluorine-based piezoelectric polymer layer and the electrode layer can be varied as needed. During construction, the piezoelectric coating composition is applied directly on the electrode and cured to form a fluorine-based piezoelectric polymer layer, or the electrode coating composition is applied on the road. The piezoelectric harvesting system construction can be very simple because it can be applied directly to the surface and dried to form an electrode.

Furthermore, as the non-buried piezoelectric energy harvesting system can be easily constructed in places where power supply is weak, such as curved roads, it is possible to voluntarily supply power to traffic signs, street lights, or indicator lights, thereby promoting traffic safety, It has the advantage that it can be used as a disaster safety detection device because it can detect cracks and damage on roads due to natural disasters by using electrical connections.

1 is an exemplary diagram of an unburied piezoelectric energy harvesting system according to an example of the present invention.
2 is another exemplary diagram of an unburied piezoelectric energy harvesting system according to an embodiment of the present invention.
3 is another exemplary diagram of an unburied piezoelectric energy harvesting system according to an embodiment of the present invention.

Hereinafter, an unburied piezoelectric energy harvesting system constructed using the coating composition according to the present invention, a construction method thereof, and a piezoelectric-based energy harvesting method using the same will be described in detail. The drawings introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be exaggerated to clarify the spirit of the present invention. At this time, if there is no other definition in the technical terms and scientific terms used, it has the meaning commonly understood by those of ordinary skill in the technical field to which this invention belongs, and the gist of the present invention in the following description and accompanying drawings Descriptions of known functions and configurations that may be unnecessarily obscure will be omitted.

Existing piezoelectric energy harvesters for roads were constructed by excavating a predetermined area of the road surface and then embedding the elements in that location.

This method has the disadvantage that it is necessary to damage the road as the road surface needs to be excavated, and a lot of time and money are required for excavation and construction. In addition, there was a problem in that it was difficult to construct a curved road, so that it was difficult to reclaim in a section where the power supply was weak.

Accordingly, the present inventors have devised an unburied piezoelectric energy harvesting system after repeated research to develop a piezoelectric energy harvester that is easier to construct and can be constructed even in a weak power supply section.

In detail, an aspect of the present invention is a piezoelectric energy harvesting system constructed on the surface of a road in an unburied type without road excavation, wherein the piezoelectric energy harvesting system includes a fluorine-based piezoelectric polymer, an inorganic filler, a pigment and a solvent. It relates to a non-buried piezoelectric energy harvesting system comprising a fluorine-based piezoelectric polymer layer prepared from a piezoelectric coating composition.

As such, the non-buried piezoelectric energy harvesting system according to the present invention may not damage the road as it can be constructed on the road surface without road excavation. In addition, it is good to reduce the time and cost for road excavation.

In addition, the fluorine-based piezoelectric polymer layer prepared from the piezoelectric paint composition according to the present invention has excellent impact resistance and high durability as it uses a fluorine-based piezoelectric polymer as a main component, unlike the conventional piezoelectric energy harvester for roads using ceramic as a main component, so it is not easily damaged. There is an advantage that energy can be harvested for a long period of time.

Furthermore, as the non-buried piezoelectric energy harvesting system can be easily constructed in places where power supply is weak, such as curved roads, it is possible to voluntarily supply power to traffic signs, street lights, or indicator lights, thereby promoting traffic safety, It has the advantage that it can be used as a disaster safety detection device because it can detect cracks and damage on roads due to natural disasters by using electrical connections.

Hereinafter, an unburied piezoelectric energy harvesting system according to an example of the present invention will be described in more detail.

First, a fluorine-based piezoelectric polymer layer, which is a key component of the present invention, will be described.

The fluorine-based piezoelectric polymer layer provides a piezoelectric effect capable of converting mechanical energy such as vibration, bending, or load into electrical energy, and as described above, a piezoelectric coating composition comprising a fluorine-based piezoelectric polymer, an inorganic filler, a pigment and a solvent It may be prepared from The fluorine-based piezoelectric polymer layer prepared from the piezoelectric paint composition has excellent impact resistance and high durability as it uses a fluorine-based piezoelectric polymer as a main component, unlike the conventional piezoelectric energy harvesters for roads that use ceramic as a main component, so it can not be easily damaged and can not be easily damaged for a long time. It has the advantage of being able to harvest energy.

In an example of the present invention, the fluorine-based piezoelectric polymer may be used without particular limitation as long as it is commonly used in the art, and may be, for example, a vinylidene fluoride (PVDF)-based polymer. The PVDF-based polymer has four types of crystal structures: α, β, γ, and δ. In this case, it is preferable to use a PVDF-based polymer having a β-phase crystal structure in order to improve the piezoelectric effect. As a more specific example, the PVDF-based polymer is a homopolymer of vinylidene fluoride (VDF), or VDF and trifluoroethylene (TrFE, trifluoroethylene), chlorotrifluoroethylene (CTFE, chlorotrifluoroethylene) and hexafluoro It may be a copolymer obtained by copolymerizing at least one selected from the group consisting of propylene (HEP, hexafluoropropylene) and the like. As a more specific example, PVDF, P (VDF-co-TrFE), P (VDF-co-CTFE), P (VDF-co-HEP) and P (VDF-TrFE-CTFE) selected from the group consisting of It may be any one or two or more.

In an example of the present invention, the inorganic filler is added to further improve the piezoelectric effect, and may be a ceramic filler, CNT, a carbon-based conductive filler, or a mixture thereof. As a more specific example, the ceramic filler is It may be any one or two or more selected from lead zirconate titanate (PZT), ZnO, MgO, CdO, BaTiO ₃ , PbTiO ₃ and PbZrO _{3 ,} and the carbon-based filler is carbon nanotube (CNT), graphene (Gr), It may be any one or two or more selected from graphene oxide (GO) and reduced graphene oxide (rGO).

The inorganic filler may be added in an amount of 0.001 to 10 parts by weight based on 100 parts by weight of the fluorine-based piezoelectric polymer, but is not limited thereto.

In one embodiment of the present invention, the pigment is for expressing the color of the fluorine-based piezoelectric polymer layer as desired, and as long as it is commonly used in the art, it may be used without particular limitation.

The pigment may be added in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the fluorine-based piezoelectric polymer, but is not limited thereto.

In an example of the present invention, the solvent is for dissolving the fluorine-based piezoelectric polymer, and as long as it does not cause a chemical reaction while effectively dissolving the fluorine-based piezoelectric polymer, it can be used without particular limitation. As a specific example, the solvent is It may be any one or a mixed solvent of two or more selected from the group consisting of N-methyl-2-pyrrolidone (NMP), dimethylformamide (DMF), methyl ethyl ketone (MEK) and 1,4-dioxane. .

The solvent is sufficient enough to sufficiently dissolve the fluorine-based piezoelectric polymer and to easily apply the piezoelectric coating composition, for example, 50 to 1000 parts by weight based on 100 parts by weight of the fluorine-based piezoelectric polymer. It is not limited thereto, and may be adjusted according to the type of solvent used.

The fluorine-based piezoelectric polymer layer may be formed by using the piezoelectric coating composition as described above, and the fluorine-based piezoelectric polymer layer may be formed through two construction methods, if necessary, as described below.

First, the fluorine-based piezoelectric polymer layer may be prepared by applying a piezoelectric paint composition on an electrode during construction of a piezoelectric energy harvesting system and then drying it. As this method is a method of forming a fluorine-based piezoelectric polymer layer by applying a piezoelectric paint composition to the construction section of the piezoelectric energy harvesting system, it is not limited by the shape of the road at all. It has the advantage that it can be installed very easily.

Alternatively, the fluorine-based piezoelectric polymer layer may be prepared by coating and drying a piezoelectric coating composition on a substrate to form a film, and then adhering a fluorine-based piezoelectric polymer film on an electrode. In this case, it is preferable to use a substrate from which the fluorine-based piezoelectric polymer film can be easily peeled off, and film formation may be performed by a conventional method.

Meanwhile, the non-buried piezoelectric energy harvesting system may further include an electrode, and as described above, a fluorine-based piezoelectric polymer layer may be formed on the electrode.

The electrode is to electrically connect the piezoelectric energy harvesting system to deliver the power generated from the fluorine-based piezoelectric polymer layer to a necessary device or to a power storage unit such as a battery. can be formed.

First, the electrode may be manufactured by applying a paint composition for an electrode on a road during construction of a piezoelectric energy harvesting system and then drying it. In this case, the coating composition for an electrode may include a carbon compound, an electrode forming material that is a metal particle or a mixture thereof, a polymer binder, and a dispersion medium.

For example, the carbon compound may be any one or two or more selected from the group consisting of carbon nanotubes (CNT), graphene (Gr), graphene oxide (GO), and reduced graphene oxide (rGO). In addition, the metal particles may be any one or two or more selected from the group consisting of gold (Au), silver (Ag), platinum (Pt), copper (Cu) and aluminum (Al).

The polymer binder may be used without particular limitation as long as it is commonly used in the art, and as a specific example, it may be an acryl-urethane copolymer or the like.

The solvent is methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, acetone, methyl ethyl ketone, cyclohexanone, hexane, diethylamine, triethylamine, octadecyl amine, Cyclohexane, ethyl acetate, acetone, dimethylformamide, dimethylacetamide, methylene chloride, chloroform, carbon tetrachloride, dimethyl sulfoxide, dioxin, nitromethane, toluene, xylene, dichlorobenzene, dimethylbenzene, trimethylbenzene, methylnaphthalene, tetra Any one or two selected from the group consisting of hydrofuran, N-methyl-2-pyrrolidone, pyridine, acrylonitrile, aniline, sorbitol, carbitol, carbitol acetate, methyl cellosolve and ethyl cellosolve It may be a mixed solvent of the above, but is not necessarily limited thereto.

Alternatively, the electrode may be a thin-film electrode attached to a road. In this case, the thin-film electrode may be used without particular limitation as long as it is commonly used in the art, and specific examples thereof include gold (Au), silver (Ag), platinum (Pt), copper (Cu) and aluminum (Al). It may include any one or two or more selected from the group consisting of. Preferably, the metal electrode may be gold (Au) or platinum (Pt) having high electrical conductivity and thermal stability at high temperature.

As shown in FIG. 1 , the thin-film electrode may be adhered to the road using a road-electrode adhesive, and the road-electrode adhesive may be used without particular limitation as long as it is commonly used in the art.

In addition, when forming a fluorine-based piezoelectric polymer layer with a fluorine-based piezoelectric polymer film, an adhesive for bonding the electrode and the fluorine-based piezoelectric polymer layer is required. It is preferable to do

As an example, the conductive adhesive may be a conductive carbon adhesive including a carbon compound, a conductive polymer, and a solvent.

As a more specific example, the carbon compound may be any one or two or more selected from the group consisting of carbon nanotubes (CNT), graphene (Gr), graphene oxide (GO), and reduced graphene oxide (rGO). can

The conductive polymer may be any one or two or more selected from the group consisting of polyaniline, polypyrrole, polythiophene, polyacetylene and polysulfonitride.

The solvent is methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, acetone, methyl ethyl ketone, cyclohexanone, hexane, diethylamine, triethylamine, octadecyl amine, Cyclohexane, ethyl acetate, acetone, dimethylformamide, dimethylacetamide, methylene chloride, chloroform, carbon tetrachloride, dimethyl sulfoxide, dioxin, nitromethane, toluene, xylene, dichlorobenzene, dimethylbenzene, trimethylbenzene, methylnaphthalene, tetra Any one or two selected from the group consisting of hydrofuran, N-methyl-2-pyrrolidone, pyridine, acrylonitrile, aniline, sorbitol, carbitol, carbitol acetate, methyl cellosolve and ethyl cellosolve It may be a mixed solvent of the above, but is not necessarily limited thereto.

Furthermore, in the non-buried piezoelectric energy harvesting system according to an embodiment of the present invention, electrodes may be formed not only on the lower portion of the fluorine-based piezoelectric polymer layer but also on the upper portion.

In addition, the non-buried piezoelectric energy harvesting system according to an embodiment of the present invention may be provided with a non-slip packaging material layer on the uppermost layer.

The non-slip packaging material layer is to prevent the piezoelectric energy harvesting system from being damaged while transmitting external pressure to the lower layer and at the same time to prevent slipping of automobiles, etc. may be added.

In one embodiment, the non-slip pavement layer may be formed from the paint composition for road pavement of Patent Registration No. 10-2138777 registered by the same applicant. More specifically, the anti-slip packaging material layer is a silane-modified acrylic resin having a weight average molecular weight of 35,000 ~ 50,000 g / mol and a glass transition temperature (Tg) of 35 ~ 50 ℃, and a weight average molecular weight of 30,000 ~ 100,000 g / mol 50 to 90 wt% of a resin mixture comprising a fluorine-modified acrylic resin having 5 to 40% by weight of a modified filler comprising ground calcium carbonate, barium sulfate, potassium oxide, magnesium silicate, fine ceramics and pigment; 1 to 20% by weight of an antifreeze comprising 70 to 90% by weight of sodium chloride, 1 to 20% by weight of calcium chloride, and 3 to 20% by weight of a siliconate-based compound based on the total weight of the antifreeze; and 0.1 to 5 wt% of a curing agent; may be formed from a paint composition for road pavement comprising.

In another embodiment, the non-slip packaging material layer may be formed from the coating composition of Patent Application No. 10-2020-0090312 filed by the same applicant. More specifically, the anti-slip packaging material layer is 30-60 wt% of a performance-improving binder comprising a fluorine-modified acrylic resin having a weight average molecular weight of 30,000 to 100,000 g/mol, an acrylate-based monomer, silica sand, a pigment, and a curing accelerator; 10 to 50% by weight of a modified filler comprising ground calcium carbonate, barium sulfate, potassium oxide, magnesium silicate, fine ceramics and a pigment; 10-20 wt% of an anti-icing agent comprising 70-90 wt% of sodium chloride, 1-20 wt% of calcium chloride and 3-20 wt% of a siliconate-based compound based on the total weight of the anti-icing agent; 0.5 to 3% by weight of an initiator; and 2 to 10 wt% of a curing agent; may be formed from a coating composition comprising a.

In addition, another aspect of the present invention relates to a piezoelectric-based energy harvesting method for harvesting electrical energy using the above-described non-buried piezoelectric energy harvesting system. That is, it relates to a method of harvesting power generated from the fluorine-based piezoelectric polymer layer of the above-described non-buried piezoelectric energy harvesting system, wherein the fluorine-based piezoelectric polymer layer converts mechanical energy such as vibration, bending or load into electrical energy, , it is possible to harvest electrical energy by storing it in a power storage unit such as a battery through an electrode.

On the other hand, another aspect of the present invention relates to a construction method of the non-buried piezoelectric energy harvesting system comprising; constructing the above-described non-buried piezoelectric energy harvesting system on a road.

At this time, the components and contents of each component of the non-buried piezoelectric energy harvesting system are the same as described above, and thus a redundant description is omitted, and as shown in FIGS. 1 to 3, the upper and lower electrodes and/or the fluorine-based piezoelectric polymer layer are It may be formed by using a preformed product (a fluorine-based piezoelectric polymer film, a thin-film electrode) or by applying a coating composition (a piezoelectric coating composition, a coating composition for an electrode).

The non-buried piezoelectric energy harvesting system may be constructed in a school zone or a section with weak power supply, and the section with weak power supply may mean a road section in which it is difficult to construct an electric power system, such as a curved road.

Hereinafter, an unburied piezoelectric energy harvesting system constructed using the coating composition according to the present invention, a construction method thereof, and a piezoelectric-based energy harvesting method using the same will be described in more detail below through examples. However, the following examples are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Also, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of effectively describing particular embodiments only and is not intended to limit the invention. In addition, the unit of additives not specifically described in the specification may be weight %.

[Production Example]

a) Conductive Carbon Adhesive:

After dissolving polyaniline in N-methyl-2-pyrrolidone (NMP) at a concentration of 10% by weight, 200 parts by weight of a carbon compound relative to 100 parts by weight of polyaniline was mixed to prepare a conductive carbon adhesive. In this case, the carbon compound was used by mixing carbon nanotubes (CNT): reduced graphene oxide (rGO) in a weight ratio of 4:6.

b) piezoelectric paint composition:

By dissolving vinylidene fluoride/trifluoroethylene copolymer (P(VDF-co-TrFE), TrFE/VDF = 20/80) in methyl ethyl ketone (MEK) to prepare a solution having a solid content of 20% by weight, the copolymer A piezoelectric coating composition was prepared by mixing 0.1 parts by weight of carbon nanotubes (CNT) and 12 parts by weight of titanium dioxide as a pigment based on 100 parts by weight and uniformly mixing.

c) Fluorine-based piezoelectric polymer film:

The piezoelectric paint composition was applied on a polyethylene terephthalate (PET) substrate, dried to form a film, and peeled to prepare a fluorine-based piezoelectric polymer film.

d) Paint composition for electrode:

After dissolving polyaniline in N-methyl-2-pyrrolidone (NMP) at a concentration of 10% by weight, 80 parts by weight of platinum (Pt) nanoparticles were mixed with 100 parts by weight of polyaniline to prepare a coating composition for an electrode.

e) anti-slip paint composition:

The coating composition of Patent Application No. 10-2020-0090312 filed by the same applicant was used.

Specifically, 59% by weight of the performance-improving binder, 30% by weight of the modified filler, 10% by weight of the anti-freezing agent and 1% by weight of benzoyl peroxide (hardener) were stirred with a forced mixer for 3 minutes to prepare an anti-slip coating composition.

At this time, the performance-improving binder is 60% by weight of fluorine-modified acrylic resin, 19% by weight of 2-ethylhexyl acrylate (2-EHA), 20% by weight of artificial silica sand No. 6, 0.5% by weight of titanium dioxide and nn-dimethyl aniline (DMA) , curing accelerator) was prepared by mixing 0.5 wt%, and the fluorine-modified acrylic resin was prepared and used by the following method.

Methyl methacrylate monomer (MMA) 430 g (4.294 mol), n-butyl acrylate monomer (n-BA) 100 g (0.78 mol), tetrahydrofurfuryl methacrylate monomer (THFMA) 180 g (1.058 mol) , 2-hydroxyethyl methacrylate (2-HEMA) 100 g (0.768 mol) and trifluoroethyl methacrylate (TFEMA) 65 g (0.387 mol) were mixed, and in this mixture n-dodecyl mercaptan ( n-DDM) 10 g was added, and the temperature was raised to 80 ~ 85 °C. Then, 2% by weight of 2,2'-azobis(2,4-dimethylvaleronitrile) (V-65) is added in small portions based on the total amount of the mixture and polymerized between 80 and 95°C, paying attention to the exothermic temperature not exceeding 95°C. synthesize After completion of the reaction, 0.1% by weight of 2,6-di-t-butyl-4-methyl phenol (BHT) based on the total amount of the mixture was added and cooled to obtain a fluorine-modified acrylic resin. It was confirmed that the prepared fluorine-modified acrylic resin had a weight average molecular weight of 58,000 g/mol.

In addition, the modified filler is heavy calcium carbonate 65% by weight, barium sulfate 5% by weight, potassium oxide 5% by weight, magnesium silicofluoride 5% by weight, fine ceramic 5% by weight, artificial silica sand No. 6 10% by weight and titanium dioxide 5% by weight % was prepared by mixing.

The anti-freezing agent was prepared and used as follows. First, 80% by weight of sodium chloride, 10% by weight of calcium chloride and 10% by weight of sodium methyl silicate (Na-MS) were mixed, and then 20 g of the mixture was dissolved in 250 ml of water to prepare a mixed solution. Acetic acid was added to the mixed solution to adjust the acidity to pH 4, and then stirred for 8 hours to react. After completion of the reaction, the water was dried to obtain an anti-freeze agent.

[Example 1]

After applying a urethane adhesive on an asphalt road specimen, a thin-film platinum (Pt) (lower electrode) was adhered, a conductive carbon adhesive was applied thereon, and then a fluorine-based piezoelectric polymer film was adhered. Similarly, a conductive carbon adhesive was applied on the fluorine-based piezoelectric polymer film, and then thin-film platinum (Pt) (upper electrode) was adhered. A piezoelectric-based energy harvesting system sample of the form shown in FIG. 1 was prepared by applying an anti-slip coating composition thereon and drying it.

[Example 2]

After coating the electrode coating composition on the asphalt road specimen and drying it to form a lower electrode, the piezoelectric coating composition was applied thereon and then dried to form a fluorine-based piezoelectric polymer layer. After coating the coating composition for electrodes on the piezoelectric polymer layer and drying it to form an upper electrode, an anti-slip coating composition was applied to the top and dried to prepare a sample of a piezoelectric-based energy harvesting system as shown in FIG. 2 .

[Example 3]

After coating the electrode paint composition (for lower electrode) on the asphalt road specimen, a fluorine-based piezoelectric polymer film was adhered. After coating the coating composition for electrodes on the piezoelectric polymer layer and drying it to form an upper electrode, an anti-slip coating composition was applied upward and then dried to prepare a sample of a piezoelectric-based energy harvesting system as shown in FIG. 3 . .

Electrical properties were evaluated by applying a pressure above a certain level to each of the piezoelectric-based energy harvesting system samples prepared above. As a result, it was confirmed that a voltage of 100 V or more was generated without any other power supply to the sample of the piezoelectric-based energy harvesting system.

Although the present invention has been described through the specific matters and limited examples as described above, these are provided only to help a more general understanding of the present invention, and the present invention is not limited to the above examples, and the present invention pertains to Various modifications and variations are possible from these descriptions by those of ordinary skill in the art.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

Claims (9)

It is a piezoelectric energy harvesting system that is built on the surface of the road without road excavation.
The piezoelectric energy harvesting system is a fluorine-based piezoelectric polymer prepared from a piezoelectric coating composition comprising 0.001 to 10 parts by weight of an inorganic filler, 0.01 to 10 parts by weight of a pigment, and 50 to less than 1000 parts by weight of a solvent based on 100 parts by weight of the fluorine-based piezoelectric polymer. An unburied piezoelectric energy harvesting system, characterized in that it comprises a layer.
The method of claim 1,
The fluorine-based piezoelectric polymer layer is a piezoelectric energy harvesting system, which is manufactured by applying a piezoelectric paint composition on an electrode during construction of the piezoelectric energy harvesting system and drying it.
The method of claim 1,
The fluorine-based piezoelectric polymer layer is prepared by coating and drying a piezoelectric coating composition on a substrate to form a film, and then adhering a fluorine-based piezoelectric polymer film on an electrode.
4. The method of claim 2 or 3,
The electrode is a non-buried piezoelectric energy harvesting system that is manufactured by applying a coating composition for an electrode on a road during construction of the piezoelectric energy harvesting system and drying it.
4. The method of claim 2 or 3,
The electrode is an unburied piezoelectric energy harvesting system that is a thin film electrode attached to the road.
The method of claim 1,
The inorganic filler is a ceramic filler, a carbon-based conductive filler, or a mixture thereof, an unembedded piezoelectric energy harvesting system.
A piezoelectric-based energy harvesting method for harvesting electrical energy using the piezoelectric energy harvesting system of claim 1 .
The construction method of a non-buried piezoelectric energy harvesting system comprising; constructing the non-buried piezoelectric energy harvesting system of claim 1 on a road.
9. The method of claim 8,
The non-buried piezoelectric energy harvesting system is a construction method of a non-buried piezoelectric energy harvesting system to be constructed in a school zone or a weak power supply section.

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