KR101592950B1

KR101592950B1 - Paint for measuring deformation of structure having the magnetic material tape comprising the same and deformation rate measuring method of structure using the same

Info

Publication number: KR101592950B1
Application number: KR1020090017316A
Authority: KR
Inventors: 함승주; 임윤묵; 임윤철; 박요셉
Original assignee: 연세대학교 산학협력단; (주)기술과가치
Priority date: 2009-02-27
Filing date: 2009-02-27
Publication date: 2016-02-11
Also published as: KR20100098250A

Abstract

The present invention relates to a paint for measuring the strain of a structure, a tape including the same, and a method for measuring a strain of the structure using the same. More specifically, the paint for measuring strain of the structure of the present invention includes magnetic materials arranged at regular intervals.

When the various industrial structures are deformed by the use load or the like, the accurate strain of the structure can be measured by measuring the magnetic flux of the paint according to the present invention formed directly on the surface of the structure or attached using a tape or the like. It is possible to prevent a safety accident from occurring due to excessive deformation of the structure.

Magnetic body, cluster, hydrophilic material, structure, strain, magnetic flux

Description

TECHNICAL FIELD [0001] The present invention relates to a strain-measuring paint for a structure containing a magnetic material, a tape including the same, and a method for measuring a strain of the structure using the same,

The present invention relates to a coating material for deformation measurement, a tape including the same, and a method for measuring a strain of the structure using the same.

Structures that are widely used in construction, civil engineering, and machinery fields are deformed due to the use load during public use. This kind of deformation is caused by the combination of various loads. Measuring the degree of deformation of the structure under the existing load is a very important basis for judging the state of the structure.

Recently, the development of methods for measuring the degree of deformation of such structures has been continuously studied. However, in order to measure the deformation of the structure, various complicated electric devices have been introduced to measure deformation, , There is a problem that the operation is cumbersome.

That is, in the method of measuring the strain of the conventional structure, deformation of the structure was measured by measuring the deformation of the foil type using the change of electrical resistance. Such an electric device is expensive, inconvenient and complicated to use, It is necessary to develop a strain measurement method of a structure that can accurately measure the strain of the structure accurately.

An object of the present invention is to provide a coating material for deformation measurement of a structure which is made to meet the above-mentioned necessity of technology development and which can more easily measure the strain of the structure more accurately.

Another object of the present invention is to provide a tape for measuring the strain of a structure which can be used for easily measuring strain of a structure attached to a surface of a structure to be measured, .

It is still another object of the present invention to provide a strain measuring method of a structure including the paint as described above to more easily measure the strain of the structure.

As a means for solving the above-mentioned problems, the present invention provides a paint for strain measurement of a structure including a magnetic body arranged at regular intervals.

Further, as another means for solving the above-mentioned problems of the present invention, there is provided a substrate comprising: a substrate; And a coating layer formed on the surface of the substrate and containing the coating material of the present invention.

In addition, the present invention provides, as yet another means for solving the above-mentioned problems, a process for producing a coating material according to the present invention, A second step of forming the substrate on the deformation target structure; And a third step of measuring a magnetic flux change of the magnetic body.

According to the present invention,

First, even when a complicated electric device is not used, the composition including the magnetic material is uniformly applied to the surface of various industrial structures, so that the strain of the structure can be easily and easily confirmed.

Second, since the deformation of the structure can be accurately measured by the magnetic flux change of the magnetic body, it is possible to accurately grasp the degree of deformation that is the basis of the repair work, thereby preventing the occurrence of safety accidents due to excessive deformation of the structure.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

Hereinafter, a paint for measuring the strain of a structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

The coating material for strain measurement of a structure according to an embodiment of the present invention includes magnetic materials arranged at regular intervals.

In the present invention, the magnetic body means a material through which a magnetic flux representing the magnetic flow flows.

Here, when a defect occurs in the path (magnetic path) through which the magnetic flux flows, the magnetic flux is deformed so as to avoid defects. As shown in FIG. 1, the surface of the ferromagnetic material uniformly arranged at regular intervals The magnetic flux in the shallow surface layer leaks into the space above the surface of the ferromagnetic body.

Therefore, in the case of measuring the magnetic flux leaking into the space of the defective portion where the deformation occurs, the amount of change of the magnetic flux can be confirmed. That is, when the magnetic material arranged at regular intervals changes in spacing due to a certain deformation, the degree of deformation can be accurately measured by measuring the amount of change in magnetic flux at the corresponding portion.

Accordingly, in the case of measuring the strain of a structure using a coating material including magnetic materials arranged at regular intervals as in the present invention, the degree of deformation of the structure can be easily and accurately measured by using a simple magnetic force detector or the like.

Here, the average particle diameter of the magnetic material is not particularly limited, and may be appropriately selected depending on the intended use, but may be preferably 80 nm to 200 nm.

The intergranular spacing of the magnetic material is not particularly limited, but may be, for example, 1 nm to 2 nm.

If the distance between the magnetic bodies is out of the above range, it may become difficult to fill the magnetic material between the magnetic material (eg, polydimethylsiloxane) and the degree of change of the structure.

Here, the magnetic material may include all of the particles exhibiting magnetism and is not particularly limited, but may be at least one selected from a magnetic material or a magnetic alloy, for example.

The magnetic material or magnetic alloy is if the material exhibiting magnetism is that the type is not particularly limited, for example, as the magnetic material is a Co, Mn, Fe, Ni, Gd, Mo, MM _'2 O ₄ and MxOy M and M 'each independently represents Co, Fe, Ni, Mn, Zn, Gd or Cr, and 0 <x? 3 and 0 <y? 5, .

Examples of the magnetic alloy include at least one selected from the group consisting of CoCu, CoPt, FePt, CoSm, NiFe, and NiFeCo

In addition, the magnetic body may be formed by coating a cluster-type ferromagnetic nanoparticle with a hydrophilic material.

When the magnetic body is formed of a cluster-like aggregate, the magnetic efficiency can be further improved and the change of the magnetic flux can be made easier than the measurement. When the hydrophilic substance is coated on the cluster type ferromagnetic nanoparticles, So that it is easy to arrange them at regular intervals.

On the other hand, the ferromagnetic nanoparticles may include at least one selected from the group consisting of iron, manganese, and cobalt, although the ferromagnetic nanoparticles may include any magnetic material particularly strong among the magnetic materials and are not particularly limited.

The ferromagnetic nanoparticles are obtained by thermally decomposing the initial magnetic nanoparticle seeds using a solvent having a high boiling point, and can exhibit high crystallinity and magnetic properties.

The ferromagnetic nanoparticles may be obtained by mixing a magnetic nanoparticle seed and a nanoparticle precursor in a solvent.

Here, the solvent is not particularly limited, and solvents known in this field can include all solvents that can be used for preparing the ferromagnetic nanoparticles, and include, but are not limited to, organic surface stabilizers The nanoparticle precursor may be injected to coordinate the organic surface stabilizer on the surface of the nanoparticles and may have a high boiling point close to the pyrolysis temperature of the complex having the organic surface stabilizer coordinated on the surface of the nanoparticles.

As the organic surface stabilizer, various materials known in this field can be used, and examples thereof include alkyl trimethyl halide and the like.

More specifically, the solvent may be an ether compound such as octyl ether, butyl ether, hexyl ether, decyl ether or phenyl ether, a heterocyclic compound such as pyridine or tetrahydrofuran (THF), a toluene, xylene, mesitylene , Or aromatic compounds such as benzene: sulfoxide compounds such as dimethylsulfoxide (DMSO); Amide compounds such as dimethylformamide (DMF); Octyl alcohol, or an alcohol such as decanol; Hydrocarbons having 1 to 20 carbon atoms such as pentane, hexane, heptane, octane, nonane, decane, dodecane, tridecane, tetradecane, pentadecane or hexadecane, Dimethylformamide, tetrahydrofuran, and the like.

For example, the magnetic nanoparticle seeds may include FePt (an alloy of iron and platinum), Co, and the like. The magnetic nanoparticle seed may include any material that can be used as a magnetic nanoparticle seed, Mn, Fe, Ni, Gd and Mo may be used.

In addition, the nanoparticle precursor may include any material that can be used as a precursor of the nanoparticles, and the kind thereof is not particularly limited, but may be selected from the group consisting of a metal, -CO, -NO, -C ₅ H ₅ , an alkoxide or a ligand And a metal carbonyl compound such as iron pentacarbonyl, Fe (CO) ₅ , ferrocene or manganese carbonyl (Mn ₂ (CO) ₁₀ ) , Metal acetylacetonate compounds such as iron acetylacetonate (Fe (acac) ₃ ), metal salts including metals and metal ions combined with anions such as Cl ^- or NO ₃ ^- can be used have.

Preferably, the nanoparticle precursor is selected from the group consisting of iron pentacarbonyl, ferrocene, manganese carbonyl, iron acetylacetonate, iron trihydrochloride (FeCl ₃ ), iron chloride (FeCl ₂ ), iron nitrate NO ₃ ) ₃ ).

The ferromagnetic nanoparticles as described above can be synthesized through various methods known in the art and are not particularly limited. For example, the ferromagnetic nanoparticles can be synthesized by thermal decomposition.

In addition, the hydrophilic material may include any substance that is negatively charged or positively charged and can generate a repulsive force between the particles, and the kind thereof is not particularly limited. For example, silica, polyalkylene glycol, polyetherimide , Polyvinylpyrrolidone, a hydrophilic polyamino acid, and a hydrophilic vinyl-based polymer resin.

When such a hydrophilic substance is coated on the ferromagnetic nanoparticles, the arrangement of the magnetic substances can be made easier.

Referring to FIG. 1, when deformation occurs in the intervals of the uniformly arranged magnetic bodies, the magnetic flux in the shallow surface layer leaks into the space above the surface of the ferromagnetic body. As the magnetic flux leaking into the space of the defect portion increases, the change of the magnetic flux is observed, and it is possible to measure the defect using this.

Therefore, when a deformation of a part of a structure coated with a coating material for deformation measurement including a magnetic body according to an embodiment of the present invention occurs, a magnetic flux leaking from the deformed part to a space is changed, By measuring, the strain of the structure can be measured easily.

On the other hand, the present invention also relates to a substrate; And a tape for measuring strain of a structure formed on the surface of the substrate and including a coating layer containing the coating material of the present invention.

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

That is, the tape is uniformly coated with the paint on one surface, and the other surface is attached to the surface of the structure. When the deformation occurs in the structure, the tape reacts sensitively and deforms with the structure to change the gap between the magnetic bodies As a result, the degree of deformation of the structure can be measured.

When the tape for measuring the strain of such a structure is attached to the structures of various industrial fields and used for measuring the strain of the structure, the degree of deformation of the structure can be easily and easily measured.

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

In addition, the present invention also relates to a process for producing a coating composition, comprising: a first step of forming a coating material according to the present invention on a surface of a substrate; A second step of forming the substrate on the deformation target structure; And a third step of measuring a magnetic flux change of the magnetic body.

The method of measuring a strain of a structure according to the present invention comprises the steps of preparing a coating material containing a magnetic material arranged at regular intervals as described above, and then forming the coating material on the surface of the base material.

The method of arranging the magnetic body can be manufactured through a known arrangement method (magnetic field alignment characteristic of the magnetic body is used to align the magnetic field at a certain distance by the magnetic field) 10-2005-0007731, 10-2006-0054115, 10-2006-0107325, 10-2007-0112429, 10-2008-0006478, 10-2008-0013366).

On the other hand, the kind of the substrate is not particularly limited, and various materials that can be used by attaching to a structure such as a tape can be used. Therefore, in the first step of the present invention, the coating material can be applied uniformly on the substrate.

Then, the second step can adhere the substrate to the surface of the strain measurement structure.

Here, the strain measurement target structure means a target structure for which the degree of strain is to be measured.

Thus, when the base material is attached to the surface of the structure, the strain of the structure can be measured by measuring the magnetic flux that changes according to the degree of deformation of the structure.

Hereinafter, a method of preparing the ferromagnetic nanoparticles included in the strain-measuring paint of the structure of the present invention will be described in detail with reference to the following Production Examples.

Production Example 1 Production of ferromagnetic nanoparticles

First, 10.8 g of iron chloride (Sigma-Aldrich) and 36.5 g of sodium oleate (Sigma-Aldrich) were dissolved in a mixed solvent (80 mL of ethanol, 60 mL of distilled water and 140 mL of hexane). The mixture was then heated to 70 DEG C and allowed to react for 4 hours to produce an iron-oleate complex.

After completion of the reaction, the upper organic layer containing the iron-olate complex was washed three times with distilled water (30 mL) in a separating funnel. After washing, the hexane was evaporated to give the iron-olate complex as a waxy solid form.

Then, 36 g of the synthesized complex and 5.7 g of oleic acid (Sigma-Aldrich) were dissolved in 1-octadecene at room temperature. The mixture was then heated to 320 DEG C at a constant heating rate (3.3 DEG C / min) and held for 30 minutes.

Then, the solution containing the magnetic nanoparticles was cooled to room temperature, and ethanol (500 mL) was added. The prepared magnetic nanoparticles were purified through centrifugation (15,000 rpm).

Accordingly, iron oxide (Fe ₃ O ₄ ) magnetic nanoparticles were synthesized.

1 is a graph showing optical wavelengths according to a change in inter-particle distance of a magnetic material included in a coating material for strain measurement of a structure according to an embodiment of the present invention,

2 is a transmission electron micrograph showing a magnetic body (a), a cluster-type magnetic body (b) and a magnetic body (c) encapsulated by silica contained in the composition for strain measurement of a structure according to an embodiment of the present invention .

Claims

A first step of forming a coating material on a surface of a base material, the coating material including a magnetic material arranged at intervals of 1 nm to 2 nm;

A second step of forming the substrate on the deformation target structure; And

And a third step of measuring a magnetic flux change of the magnetic body.

The method according to claim 1,

Wherein the magnetic body has a diameter of 80 nm to 200 nm.

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The method according to claim 1,

Wherein the magnetic body is at least one selected from a magnetic material or a magnetic alloy.

5. The method of claim 4,

The magnetic material is at least one selected from the group consisting of Co, Mn, Fe, Ni, Gd, Mo, MM ' ₂ O ₄ and MxOy,

Wherein M and M 'each independently represent Co, Fe, Ni, Mn, Zn, Gd or Cr, and 0 < x? 3 and 0 < y? 5.

5. The method of claim 4,

Wherein the magnetic alloy is at least one selected from the group consisting of CoCu, CoPt, FePt, CoSm, NiFe, and NiFeCo.

The method according to claim 1,

Wherein the ferromagnetic nanoparticles are coated with a hydrophilic material in the form of a cluster.

8. The method of claim 7,

Wherein the ferromagnetic nanoparticles comprise at least one selected from the group consisting of iron, manganese, and cobalt.

8. The method of claim 7,

Wherein the ferromagnetic nanoparticles are obtained by mixing a magnetic nanoparticle seed and a nanoparticle precursor in a solvent.

10. The method of claim 9,

Wherein the solvent comprises an organic surface stabilizer.

10. The method of claim 9,

Wherein the solvent is at least one selected from the group consisting of ether compounds, heterocyclic compounds, aromatic compounds, sulfoxide compounds, amide compounds, alcohols, hydrocarbons having 1 to 20 carbon atoms, and water.

10. The method of claim 9,

Wherein the solvent is phenyl ether, tetrahydrofuran or dimethylformamide.

10. The method of claim 9,

Wherein the magnetic nanoparticle seeds are at least one selected from the group consisting of FePt, Co, Mn, Fe, Ni and Gd.

10. The method of claim 9,

Wherein the nanoparticle precursor is at least one selected from the group consisting of iron pentacarbonyl, ferrocene, manganese carbonyl, iron acetylacetonate, iron pyrophosphate, ferric chloride, and iron nitrate.

10. The method of claim 9,

Wherein the hydrophilic material is at least one selected from the group consisting of silica, polyalkylene glycol, polyetherimide, polyvinylpyrrolidone, hydrophilic polyamino acid, and hydrophilic vinyl-based polymer resin.

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