KR20100098249A - Paint for measuring deformation of structure, tape comprising the same and deformation measuring method of structure using the same - Google Patents

Abstract

PURPOSE: Paint for measuring the deformation of a structure, tape comprising the same and a deformation measuring method of a structure using the same are provided to enable to be visually recognized the deformation of various industrial structures without a complex electric device simply. CONSTITUTION: Paint for measuring the deformation of a structure comprises optical crystal. The optical crystal is made through the arrangement of a first dielectric unit and a second dielectric unit according to a grid pattern. The second dielectric unit has a relative permittivity different from that of the first dielectric unit. The average particle diameter of the first dielectric unit is 80-200 nm. The first dielectric unit is polymer or polysiloxane induced to one or more monomers selected from a group consisting of styrene, (meta) esther acrylate and (meta) acrylamide. The first dielectric unit is amphipathic polystyrene/methacrylate block copolymer.

Description

Paint for measuring the deformation of a structure, a tape comprising the same and a method for measuring the deformation of the structure using the same {Paint for measuring deformation of structure, tape comprising the same and deformation measuring method of structure using the same}

The present invention relates to a paint for structural deformation measurement, a tape comprising the same and a method for measuring deformation of a structure using the same.

The structure is deformed due to the working load during use. These deformations are caused by various loads and combinations of loads. Measuring the deformation caused by the loads that the structure is currently receiving is a very important basis in determining the state of the structure.

Until recently, the development of a method for measuring the deformation of such a structure has been continuously studied, but conventionally, the method of measuring the deformation of such a structure is measured by using an electrical device. Since the deformation of the structure had to be measured by introduction, it was difficult to deal with the deformation of the structure immediately and was troublesome.

That is, conventionally, since the deformation of the structure was measured using a foil-type deformation measuring device mainly using a change in electrical resistance, it was not immediately possible to identify the deformation, and by periodically measuring by using a complicated electric device. Since the deformation was confirmed, there was an inadequate aspect in preventing safety accidents caused by the deformation of the structure.

Therefore, there is a demand for the development of a technology capable of easily and easily measuring the deformation of a structure without using a complicated electric device.

The present invention was created to meet the necessity of the above-described technology development, and the object of the present invention is to provide a structural deformation measurement paint that can visually determine whether the deformation from the outside in response to the deformation of the structure occurs. .

In addition, another object of the present invention is to provide a tape including the paint as described above, by being attached to the surface of the structure to measure the deformation to easily determine whether or not the deformation of the structure.

In addition, another object of the present invention is to provide a method for measuring deformation of a structure for measuring whether the structure is deformed using the paint as described above.

The present invention provides a paint for structural deformation measurement comprising a photonic crystal in which a first dielectric and a second dielectric having a different dielectric constant different from that of the first dielectric are regularly arranged according to a lattice pattern. do.

In addition, the present invention is another means for solving the above problems, the base material; And a coating layer formed on the surface of the substrate and including a coating layer containing the paint of the present invention.

In addition, the present invention is another means for solving the above problems, the first step of forming a paint according to the invention on the surface of the substrate; A second step of disposing the substrate on which the paint is formed on the surface of the deformation measurement structure; And a third step of measuring whether the structural color of the paint changes.

According to the present invention, it is not only possible to visually check the deformation of various industrial structures more easily and conveniently without using complicated electric devices, but also to prevent safety accidents due to the deformation of the structure in advance. Can be applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be water and variations.

Hereinafter, the paint for structural deformation measurement and the method for measuring deformation of a structure using the same according to an embodiment of the present invention will be described with reference to FIGS. 1 to 2.

As described above, the paint for structural deformation measurement includes a photonic crystal in which a first dielectric and a second dielectric having a different dielectric constant different from that of the first dielectric are constantly arranged according to a lattice pattern.

Here, the photonic crystal refers to a material having a structure that can utilize the optical properties of the material or made to have a structure. That is, the photonic crystal forms a lattice structure composed of two or more dielectrics that are spatially repeated with a periodicity of about half the wavelength of light.

Hereinafter, the photonic crystal according to the present invention will be described in more detail.

In general, the color of an object can be said to be the color of the wavelength of light reflected from visible light reaching the object. Visible light is a bright and transparent index when light of all wavelengths is present. The reason for this interference is that light is a particle and at the same time a wave.

At this time, the light of the wavelength causing the offset interference is extinguished and the light of the wavelength causing the constructive interference is reflected. If the reflected light is blue, it appears blue even though blue does not exist.

The structural color that is colored by physical phenomena such as diffraction, interference, and scattering of light is called a structural color. The color of the structural color is not caused by a real pigment but appears due to interference due to reflection of a thin film of soap bubbles. Can be.

Among the materials with a structural color, there is a case where a regular array appears when magnified with an electron microscope. When light is emitted to the material, only light of a specific wavelength is reflected and the rest passes. Such a geometrical structure is called a photonic structure, and a state in which the optical structure is unfolded in three dimensions with a regular arrangement is called a photonic crystal.

In the present invention, in the photonic crystal, a first dielectric and a second dielectric having a different dielectric constant different from that of the first dielectric are constantly arranged according to the lattice pattern.

Herein, a form in which the first dielectric and the second dielectric are uniformly arranged according to the lattice pattern will be described with reference to FIG. 1. As shown in FIG. 1A, the first dielectric and the second dielectric are formed of D1. It means a structure arranged at regular intervals.

That is, the first dielectrics included in the paint are arranged at regular intervals, and the second dielectrics are arranged in a lattice pattern in the gaps of the first dielectrics. Thus, the dielectrics alternately form lattice patterns. In addition, since the refractive index varies according to a certain periodicity, the regularly arranged photonic crystal exhibits a structure color by reflecting light of a specific wavelength.

Therefore, as shown in (b) of FIG. 1, when a deformation occurs at a specific portion of the paint to change the particle spacing between the first dielectric and the second dielectric to D2, the photonic crystal structure is constantly arranged so that the specific wavelength is changed. Can not reflect the light, the reflected light of the portion where the deformation of the photonic crystal structure is affected.

Therefore, the arrangement interval of the photonic crystal structure is changed, and thus the gap between the first dielectric material and the second dielectric material constituting the photonic crystal structure is also changed, resulting in an optical change. As a result, reflected light of a specific wavelength that causes reinforcement interference before deformation occurs. It reflects light of different wavelengths.

Therefore, in the portion where the deformation occurs, the light of different wavelengths is reflected according to the characteristics of the photonic crystal, and thus the color is different from the previous structure color.

The paint for structural deformation measurement according to the present invention uses the characteristics of the photonic crystal, and when the principle of the photonic crystal is explained in more detail, electromagnetic waves (or light) are angular frequency (ω = 2π f ) and wave number in free space. (wave number, k = 2πλ ₀ ) may have a relationship as shown in Equation 1 below, which is referred to as " photon dispersion relation " in the present invention.

[Equation 1]

ω = ck

Where c is the speed of light.

Referring to FIG. 2, in the material A having a refractive index n, (c / n) is used instead of the speed c of Equation 1, the frequency f always has a linear function relationship with respect to the wavelength of light. To have.

However, the linear functional relationship is broken in the material (B) having a non-uniform refractive index according to the deformation of the gap. When the dielectric constant or refractive index of the material is periodically changed as shown in FIG. 2, the relationship between two physical quantities is no longer linear. It can't be maintained and will be converted into a nonlinear function relationship.

Here, the specific angular velocity region G does not have a one-to-one correspondence with the wave number, and thus becomes a discontinuous function. The light in the discontinuous frequency region does not have a functional relationship with any wave number on the x-axis in the material of the structure.

Therefore, when light having a frequency corresponding to the discontinuous region is incident on the plate having a constant refractive index in the vertical direction, no wave can exist and thus cannot be penetrated into the inside and is completely reflected. This angular velocity (or frequency) region is called the photonic band gap, and the photonic crystal is a material having such an optical band gap.

The position of the optical band gap is changed depending on the difference in refractive index or the period of the photonic crystal.

In other words, if the cycle of the photonic crystal is repeated even in the case of finding the optical bandgap or optical dispersion relationship for a material having a complicated structure, the Maxwell equation for explaining the macroscopic behavior of electromagnetic waves is solved. By calculating the frequency of the eigen mode obtained through the wave vector function in the propagation direction, the light dispersion relation of a given material can be obtained.

Therefore, the structural deformation measurement paint of the present invention includes a photonic crystal having a first dielectric and a second dielectric arranged in a lattice pattern at regular intervals to reflect light of a specific wavelength, so that the coating material is uniformly applied to the surface of the structure. When deformation occurs in a part of the structure, since the structure color is different depending on the characteristics of the photonic crystal, it is possible to immediately check whether the structure is deformed.

The size of the first dielectric is not particularly limited, and particle sizes that may be commonly applied to form photonic crystals in this field may be applied depending on the intended use, and are not particularly limited. It may be 80 to 200 nm.

Here, the kind of the material used as the first dielectric may include all of the materials capable of forming the photonic crystal as described above, but the kind thereof is not particularly limited, but for example, styrene or (meth) acrylic acid ester And (meth) acrylamide may be used a polymer or polysiloxane derived from one or more monomers selected from the group consisting of.

For example, the first dielectric may be polystyrene, polyalphamethylstyrene, polyacrylate, polymethylmethacrylate, polybenzyl methacrylate, polyphenylmethacrylate, poly-1-methacyclohexyl methacrylate. , Polycyclohexyl methacrylate, polychlorobenzyl methacrylate, poly-1-phenylethyl methacrylate, poly-1,2-diphenylethyl methacrylate, polydiphenylmethyl methacrylate, polyperfuryl methacrylate At least one selected from the group consisting of acrylate, poly-1-phenylcyclohexyl methacrylate, polypentachlorophenyl methacrylate, polypentabromophenyl methacrylate, polydimethylsiloxane and poly-N-isopropylacrylamide And preferably polystyrene.

Polystyrene has a glass transition temperature that changes the physical properties of the polymer is 95 ℃, so it is not affected by changes in ambient temperature and can be used universally. It can be preferably used as a material contained in the coating to be coated to measure the.

Furthermore, more preferably, the first dielectric may be an amphiphilic polystyrene / methylacrylate block copolymer.

The polystyrene / methylacrylate block copolymer synthesized by reacting polystyrene with methyl acrylate is excellent in strength and, when applied to the surface of the structure in the form of a paint or an adhesive, can provide more durability. Amphiphilic polystyrene / methylacrylate block copolymer can be obtained by hydrolyzing the polystyrene / methylacrylate block copolymer synthesized by mobile radical polymerization.

The amphipathic polystyrene / methyl acrylate block copolymer may contain 5 parts by weight to 50 parts by weight of methyl acrylate based on 100 parts by weight of polystyrene, preferably 10 parts by weight of methyl acrylate based on 100 parts by weight of polystyrene. It may contain 12 to 12 parts by weight.

When the methyl acrylate is contained less than 5 parts by weight with respect to 100 parts by weight of the polystyrene, the repulsive force of the negatively charged particle surface may be reduced, making it difficult to arrange in the form of photonic crystals, when contained in more than 50 parts by weight If the chain is too long, there is a risk of entanglement.

On the other hand, the molecular weight of the polystyrene / methyl acrylate block copolymer is not particularly limited, but is preferably 20,000 to 30,000.

When the molecular weight is less than 20,000, it is difficult to make nanoparticles having a diameter of 80 nm or more, and thus the utility thereof may be degraded. When the molecular weight exceeds 30,000, nanoparticles having a diameter of 300 nm or more may be prepared, and thus may not be suitable in terms of their effectiveness. .

On the other hand, the second dielectric is a material having a relative dielectric constant different from that of the first dielectric, and may include all particles capable of forming a photonic crystal structure, like the first dielectric described above, and the kind thereof is particularly limited. no.

In addition, the content, molecular weight, and average particle diameter of the material used as the second dielectric may be appropriately selected and employed as those exemplified for the first dielectric, and are not particularly limited.

In addition, the present invention; And a coating layer formed on the surface of the substrate and comprising a coating layer containing the coating material of the present invention.

The tape may include all conventional tapes that can be used for structure measurement, and is not particularly limited, but may preferably be a stress-sensitive tape.

That is, the tape is uniformly coated on one surface, and the other surface is attached to the surface of the structure, so that when the deformation occurs in the structure, the tape is sensitively deformed and deformed together with the structure so that the first dielectric and the agent contained in the paint It is preferable to use a tape which causes a change in the spacing between the particles of the dielectric material, whereby the structural color of the portion where the deformation is changed is changed.

When the structure deformation measuring tape is attached to structures of various industries and used to measure the deformation of the structure, it is easier and easier to measure the deformation of the structure.

Here, the thickness of the coating layer formed on the surface of the substrate is not particularly limited, and may be formed in various thicknesses within a range capable of identifying the structural color, but may be preferably formed in a thickness of 5 to 10 μm.

If the thickness of the coating layer is less than 5 ㎛ may not be observed as strong enough to exhibit the characteristics of the photonic crystal, if it exceeds 10 ㎛ may affect the sensitivity of the photonic crystal may not exhibit the characteristics of the photonic crystal. .

In addition, the present invention also comprises a first step of forming a coating according to the invention on the surface of the substrate; A second step of disposing the substrate on which the paint is formed on the surface of the deformation measurement structure; And a third step of measuring whether or not the structural color of the paint changes.

According to the deformation measurement method of a structure according to an embodiment of the present invention, first, a paint including the photonic crystal as described above is prepared, and the paint is formed on the surface of the substrate.

The photonic crystal may be prepared by arranging particles constituting the same at regular intervals through a method known in the art, and the manufacturing method of the photonic crystal is not particularly limited.

For example, in the case of the one-dimensional photonic crystal structure, the first dielectric material and the second dielectric material having different relative dielectric constants can be easily formed by stacking layers in a lattice pattern, and other methods of forming two-dimensional and three-dimensional photonic crystal structures are also available. Methods known in the art can be appropriately employed and implemented. In particular, a silica sphere method may be used as an example of a method of manufacturing a three-dimensional photonic crystal structure.

On the other hand, the type of the substrate is not particularly limited, and may be a variety of materials that can be used to attach to the structure, such as tape. Therefore, in the first step of the present invention, the paint can be uniformly applied onto the substrate.

Subsequently, the second step may attach the substrate to the surface of the deformation measurement structure.

Here, the deformation measurement target structure means a target structure to measure the deformation.

As such, when the substrate is attached to the surface of the structure, it is possible to determine whether the structure is deformed by measuring a change in the color of the structure of the paint, which changes according to the deformation of the structure.

Hereinafter, a method of manufacturing the first dielectric constituting the photonic crystal included in the coating for structural deformation measurement according to an embodiment of the present invention will be described in detail with reference to the following preparation example.

Preparation Example 1 Preparation of First Dielectric

In 20 ml of tetrahydrofuran (THF) solvent, 10.46 ml of polystyrene and 0.07 ml of methyl arcrate were reacted by maintaining the temperature at 85 ° C. in a reactor where nitrogen gas was refluxed and stirring for 6 hours with a magnetic stirrer. Subsequently, the obtained polymer was precipitated in excess methanol, filtered and dried to synthesize a polystyrene / methylacrylate block copolymer.

The synthesized polystyrene / methylacrylate block copolymer was obtained and dissolved in 20 ml of methylene chloride, and 10 ml of trifluoroacetic acid (TFA) was added thereto while maintaining the reaction at 0 ° C. for 24 hours.

Then, the amphiphilic polystyrene / methylacrylate block copolymer was synthesized by precipitating the obtained block copolymer in 500 ml of normal hexane (n-Hexane) through vigorous stirring.

1 is a schematic diagram showing a state in which the spacing between particles changes as deformation occurs in the tape to which the coating material for structural deformation measurement according to an embodiment of the present invention is applied,

2 is a graph showing the light dispersion relation between the material A and the photonic crystal material B having uniform refractive indices, respectively.

Claims (16)

A first dielectric; And a photonic crystal in which a second dielectric having a relative dielectric constant different from that of the first dielectric is uniformly arranged according to a lattice pattern. The method of claim 1, The first dielectric material has a structure having a mean particle size of 80 to 200 nm, the deformation coating material. The method of claim 1, The first dielectric material is a structural deformation measurement paint, characterized in that the polymer or polysiloxane derived from at least one monomer selected from the group consisting of styrene, (meth) acrylic acid ester and (meth) acrylamide. The method of claim 1, The first dielectric material is polystyrene, polyalphamethylstyrene, polyacrylate, polymethyl methacrylate, polybenzyl methacrylate, polyphenyl methacrylate, poly-1-methacyclohexyl methacrylate, polycyclohexyl methacrylate , Polychlorobenzyl methacrylate, poly-1-phenylethyl methacrylate, poly-1,2-diphenylethyl methacrylate, polydiphenylmethyl methacrylate, polyperfuryl methacrylate, poly-1- Structural modifications characterized in that it is at least one selected from the group consisting of phenylcyclohexyl methacrylate, polypentachlorophenylmethacrylate, polypentabromophenylmethacrylate, polydimethylsiloxane and poly-N-isopropylacrylamide Measuring paints. The method of claim 1, The first dielectric is an amphipathic polystyrene / methacrylate block copolymer, characterized in that the coating material for structural deformation measurement. The method of claim 5, The amphiphilic polystyrene / methacrylate block copolymer contains 5 to 50 parts by weight of methyl acrylate based on 100 parts by weight of polystyrene. The method of claim 5, Amphiphilic polystyrene / methylacrylate block copolymer is a structural deformation measurement paint, characterized in that the molecular weight of 20,000 to 30,000. materials; And A first dielectric formed on the surface of the substrate; And a coating layer containing a paint including a photonic crystal in which a second dielectric having a relative dielectric constant different from that of the first dielectric is uniformly arranged according to a lattice pattern. The method of claim 8, The first dielectric has an average particle diameter of 80 to 200 nm, the structure deformation measuring tape. The method of claim 8, The first dielectric is a tape for structural deformation measurement, characterized in that the polymer or polysiloxane derived from at least one monomer selected from the group consisting of styrene, (meth) acrylic acid ester and (meth) acrylamide. The method of claim 8, The first dielectric material is polystyrene, polyalphamethylstyrene, polyacrylate, polymethyl methacrylate, polybenzyl methacrylate, polyphenyl methacrylate, poly-1-methacyclohexyl methacrylate, polycyclohexyl methacrylate , Polychlorobenzyl methacrylate, poly-1-phenylethyl methacrylate, poly-1,2-diphenylethyl methacrylate, polydiphenylmethyl methacrylate, polyperfuryl methacrylate, poly-1- Determination of structural deformation, characterized in that at least one selected from the group consisting of phenylcyclohexyl methacrylate, polypentachlorophenyl methacrylate, polypentabromophenyl methacrylate, polydimethylsiloxane and poly-N-isopropylacrylamide Tape. The method of claim 8, The first dielectric is an amphipathic polystyrene / methacrylate block copolymer, characterized in that the tape for measuring the deformation of the structure. The method of claim 12, The amphipathic polystyrene / methacrylate block copolymer contains 5 parts by weight to 50 parts by weight of methyl acrylate based on 100 parts by weight of polystyrene. The method of claim 12, Amphipathic polystyrene / methylacrylate block copolymer has a molecular weight of 20,000 to 30,000 tape for structural deformation measurement. The method of claim 8, The coating layer is a tape for measuring the structure deformation, characterized in that the thickness of 5 to 10 ㎛. A first step of forming a coating according to any one of claims 1 to 7 on the surface of the substrate; A second step of disposing the substrate on which the paint is formed on the surface of the deformation measurement structure; And Deformation measuring method of a structure comprising a third step of measuring whether the structural color change of the paint.

Images