WO2015034070A1 - Pressure-sensing material, method for producing same, and pressure-sensing paint - Google Patents

Pressure-sensing material, method for producing same, and pressure-sensing paint Download PDF

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Publication number
WO2015034070A1
WO2015034070A1 PCT/JP2014/073588 JP2014073588W WO2015034070A1 WO 2015034070 A1 WO2015034070 A1 WO 2015034070A1 JP 2014073588 W JP2014073588 W JP 2014073588W WO 2015034070 A1 WO2015034070 A1 WO 2015034070A1
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Prior art keywords
pressure
compound
fluorescent
sensing material
pressure sensing
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PCT/JP2014/073588
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French (fr)
Japanese (ja)
Inventor
川俣 純
康孝 鈴木
松尾 英明
富永 亮
亮 綱島
Original Assignee
国立大学法人山口大学
日産化学工業株式会社
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Priority to JP2015535538A priority Critical patent/JP6341545B2/en
Publication of WO2015034070A1 publication Critical patent/WO2015034070A1/en

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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K9/00Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy
    • C09K9/02Organic tenebrescent materials
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/24Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • G01L1/24Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • G01L1/241Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet by photoelastic stress analysis

Definitions

  • the present invention relates to a pressure sensing material that emits fluorescence upon sensing pressure, a manufacturing method thereof, and a pressure sensing paint.
  • the stress applied to structures is from a wide range of industrial fields including automobiles and aircraft. For example, by measuring the stress applied to the structure, it is possible to prevent damage to the structure due to external or internal loads, and to develop new materials that can withstand such loads, and to design without waste. Become.
  • the stress applied to the structure can be determined by identifying the fragile parts of aircraft wings, car engines, etc., identifying deteriorated parts of concrete structures, identifying aging parts of bridge girders, wind turbine blades, etc.
  • pressure-sensitive materials that emit fluorescence by receiving stress from the outside are known as sensors that detect pressure.
  • the pressure (stress) applied to the surface of the structure has been measured using a surface pressure measuring device or the like.
  • the pressure applied to the surface of the structure can be measured using a pressure sensitive material.
  • the pressure sensitive material is applied to the surface of the structure and measured.
  • the pressure-sensitive material applied to the surface emits fluorescence or the fluorescence wavelength changes. This fluorescence is very convenient for the user because it is visible or can be imaged and analyzed with an imaging device.
  • Fluorescent materials used for such pressure-sensitive materials include many materials in which a high molecular compound is the main component and the fluorescent compound is chemically bonded to the high molecular compound, or a material in which the fluorescent compound is simply dispersed in the high molecular compound. . This is based on the principle of changing the color tone when a mechanical force is applied to the material from the outside.
  • the polymer-doped type pressure-sensitive material utilizes a phenomenon in which the distance between molecules of the fluorescent compound is changed by pulling.
  • pressure-sensitive paints there are those that detect pressure using a fluorescent material such as platinum porphyrin, ruthenium bipyridine complex, and pyrene derivative.
  • the principle of detection is detecting quenching of the fluorescent material by oxygen. Such sensing based on oxygen concentration is mainly used for aircraft stress sensing.
  • a low-oxygen containing a pressure-sensitive dye having luminescence characteristics corresponding to the oxygen pressure and polytrimethylsilylpropyne (PTMSP) as a binder Pressure-sensitive paint for pressure is known and used for wind tunnel tests and the like (Patent Document 1).
  • PTMSP polytrimethylsilylpropyne
  • Patent Document 1 the creation of mechanochromic materials whose emission color changes when mechanically stimulated, such as rubbing the surface, has been performed.
  • a mechanochromic material containing an organic gold complex (C 6 F 5 Au) 2 ( ⁇ -1,4-diisocyanobenzene) emits blue light when irradiated with ultraviolet light, and turns yellow when mechanically stimulated.
  • a stimulus such as writing with a soldering iron set at a high temperature
  • Non-Patent Document 1 and Patent Document 3 Polymer materials that optically detect pressure changes by combining an elastomer selected from polyurethane, polyacrylate, and silicon with a photochemical system are known (see Non-Patent Document 1 and Patent Document 3).
  • This elastomer synthesis and photochemical system forms an excited charge transfer complex when the pressure increases, and reduces the formation of the charge transfer complex when the pressure decreases. In other words, there is an effect that it can respond to the pressing force in addition to the pulling.
  • a polymer binder type pressure-sensitive paint is known (see Non-Patent Document 2).
  • This material uses PtTFPP, which is a kind of porphyrin, as a pressure sensitive dye, and a silicon-based polymer GP197 and glass polymer Poly (TMSP) as a binder.
  • TMSP silicon-based polymer GP197 and glass polymer Poly
  • a pressure-sensitive material that can directly measure the pressure applied to the structure has been developed in principle as described above, but has not reached a level that can be used as a paint. Further, even if the pressure-sensitive paint described above is applied to a structure and the pressure applied to the structure is measured, the location where the stress is applied cannot be stored and retained for a long time. In addition, it is difficult to sense the pressing force on the surface, and the accuracy has not reached a practically usable level.
  • the present invention has been made based on the technical background as described above, and achieves the following objects.
  • the objective of this invention provides the pressure sensing material which can directly measure the pressure concerning a structure, and a stress, its manufacturing method, and a pressure sensing coating material.
  • An object of the present invention is to provide a pressure-sensitive material that can be easily adjusted and is easy to use, a manufacturing method thereof, and a pressure-sensitive paint.
  • the pressure sensing material of the present invention comprises: A layered compound consisting of a fine particle layer of a compound derived from a clay mineral; One or more fluorescent compounds sandwiched between a plurality of the layers; A pressure sensing material filled between the layers and comprising a binder having a molecular size larger than that of the fine particles, The fluorescent compound emits fluorescence when the layer is deformed by a mechanical force applied from the outside.
  • the present invention 2 is the pressure sensing material of the present invention 1, wherein the fluorescent compound is an organic fluorescent compound having a biphenylene structure.
  • Invention 3 is characterized in that, in the pressure sensing material of Invention 1 or 2, the size of the fluorescent compound particles is smaller than that of the fine particles.
  • the present invention 4 is the pressure sensing material of the present invention 1 or 2, wherein the pressure sensing material comprises one or more compounds selected from a colorant, a filler, a temperature sensitive agent, a temperature sensitive dye, and a plasticizer. It is characterized by having.
  • the pressure sensitive paint of the present invention 5 contains the pressure sensitive material described in the pressure sensitive material of the present invention 1 to 4.
  • the manufacturing method of the pressure sensing material of the present invention 6 comprises: One or more fluorescent compounds; A layered compound consisting of a fine particle layer of a compound derived from a clay mineral; A method for producing a pressure sensing material comprising a binder filled between the layers and having a molecular size larger than that of the fine particles, Obtaining a solution of the fluorescent compound; A step of dispersing the fine particles in water to obtain a clay water dispersion; Mixing the solution of the fluorescent compound obtained in the step, the clay aqueous dispersion, and the binder to obtain a mixed solution; and And concentrating the liquid mixture to obtain the pressure sensitive material.
  • the pressure sensing material manufacturing method of the present invention 7 is characterized in that in the pressure sensing material manufacturing method of the present invention 6, the binder is a polymer compound.
  • the pressure sensing material manufacturing method of the present invention 8 is characterized in that, in the pressure sensing material manufacturing method of the present invention 6 or 7, the fluorescent compound is an organic molecule having a biphenylene structure.
  • the pressure sensing material manufacturing method of the present invention 9 is the pressure sensing material manufacturing method of the present invention 6 to 8, wherein the fluorescent compound has a rod-like shape with a size of 0.5 to 5 nm, The fine particles have a size of 20 to 100 nm.
  • the pressure sensing material manufacturing method of the present invention 10 is characterized in that, in the pressure sensing material manufacturing method of the present invention 9, the pressure sensing material is a gel-like material and is applied to the surface of a structure. To do.
  • the method for producing a pressure sensing material of the present invention 11 includes the step of heating before mixing the fluorescent compound solution, the clay aqueous dispersion and the binder in the pressure sensing material production method of the present invention 6 or 7. It is characterized by having.
  • the pressure-sensitive material and pressure-sensitive paint of the present invention do not require a high degree of expertise when used, and are easier to use than before.
  • the pressure-sensitive paint of the present invention can be used simply by being applied to the structure, and the pressure applied to the structure can be directly measured.
  • the pressure sensitive paint of the present invention when applied to a structure and subjected to stress, the fluorescent color changes and long-term fluorescence can be maintained. Furthermore, the pressure-sensitive material and pressure-sensitive paint of the present invention have made it possible to sense the pressing force, which has been difficult in the past, and to store the location where the stress is applied.
  • FIG. 1 is a conceptual diagram showing a process for manufacturing the pressure sensitive paint of the present invention.
  • FIG. 2 is a flowchart showing an example of use of the pressure sensitive paint of the present invention.
  • FIG. 3 is a conceptual diagram illustrating a mechanism in which the pressure sensing material of the present invention emits fluorescence.
  • FIG. 4 is a photograph showing a state in which a portion where the substrate coated with the pressure sensitive paint of the present invention is gripped with tweezers emits fluorescence.
  • FIG. 5 is a photograph showing a state in which a character is drawn by cutting with a cutter on a substrate coated with the pressure sensitive paint of the present invention.
  • FIG. 6 is a graph showing the results of an experiment in which the pressure sensitive paint of the present invention is heated and returned to its original state.
  • FIG. 7 shows the measurement results when a rigid molecule is used as the fluorescent compound.
  • the pressure sensing material of the present embodiment is obtained by inserting a solution in which a fluorescent compound and a polymer compound are heated and dissolved between layers of a layered compound derived from clay mineral, and then allowing to cool and solidifying.
  • mechanical pressure stress
  • the layered compound is deformed such that the layer of the layered compound is bent or broken
  • the fluorescent compound in the layer emits fluorescence. That is, when mechanical pressure is applied from the outside, the layer of the layered compound bends, the molecular structure of the polymer compound changes and rearranges, and the layers of the layered compound change, and the structure of the fluorescent compound therein Is considered to change the fluorescent color. Even when the layer of the layered compound is destroyed, it is considered that the structure of the fluorescent compound is changed and the fluorescent color is similarly changed.
  • the pressure sensing material of the present embodiment basically comprises a layered compound, a binder such as a polymer compound, and a fluorescent compound.
  • This layered compound is fine particles of the order of several tens of nm derived from clay minerals, and the fine particles are adjacent to each other to form a layer.
  • the pressure-sensitive material is composed of a plurality of layered compounds, and a fluorescent compound is sandwiched between these layers. The layered compound and the fluorescent compound are dispersed in a binder.
  • the layered compound is derived from a clay mineral, it can be called a clay compound.
  • a polymer compound is filled between the layers of the clay compound, and serves as a binder between the layers of the layered compound derived from the clay mineral.
  • a polymer compound is preferably used.
  • any high molecular compound can be used as long as it is a water-soluble polymer.
  • a thermoplastic polymer compound is more preferable, for example, a water-soluble polymer or a polymer having high solubility in a polar solvent compatible with water such as dimethylformamide (DMF) is particularly preferable.
  • the layered compound is dispersed in the coating medium while maintaining the structure and composition of the binder and the fluorescent compound.
  • FIG. 1 is a conceptual diagram showing a process for manufacturing the pressure sensitive paint of the present invention.
  • a process of manufacturing the pressure sensitive material or pressure sensitive paint of the present invention will be described with reference to FIG.
  • a fluorescent compound and a layered clay compound are prepared.
  • a fluorescent compound such as a fluorescent dye is dissolved in a solvent miscible with water to obtain an aqueous solution (first step).
  • grains of a clay compound are disperse
  • the first step and the second step can be performed in parallel or in reverse order.
  • an aqueous solution of the fluorescent compound is added to the clay aqueous dispersion to obtain a clay compound dispersion in which the fluorescent compound is adsorbed on the surface (third step).
  • the ratio of the fluorescent compound to the clay aqueous dispersion is 0.1 to 1% by weight.
  • the dispersion is heated at a temperature of 70 to 90 ° C. (fourth step).
  • the polymer compound (polymer polymer) is heated at the same temperature as in the fourth step (fifth step).
  • the fourth step and the fifth step can be performed in parallel, or the order of the steps can be reversed.
  • any known heating means such as a water bath, an oil bath, a sand bath, an oven or the like is used.
  • the solution When stirring, the solution is heated uniformly when stirred.
  • the heated dispersion and the polymer compound are mixed (sixth step). At this time, the mixing ratio of the clay compound and the polymer compound is about 5: 2 by weight.
  • the mixture When mixing the clay compound and the polymer compound, the mixture is sufficiently stirred to be uniform.
  • the solution mixed in the sixth step is concentrated to obtain a clay gel (hereinafter referred to as clay gel) (seventh step).
  • the environment for concentration is normal temperature and normal pressure. In order to concentrate this solution quickly, a method of concentrating the concentrated environment under reduced pressure and high temperature may be used.
  • FIG. 2 is a flowchart showing an example of using the obtained clay gel, and an example of using the clay gel will be described with reference to this flowchart.
  • the obtained clay gel is applied to the surface of an object such as a substrate or a structure such as a structure (also referred to as an “object to be applied”) (reference number 1).
  • the structure to which the clay gel is applied is dried (reference number 2).
  • This drying environment can be performed at normal temperature and normal pressure, but when it is in a high temperature environment, it dries quickly.
  • the adjustment and manufacture of the components of the pressure sensitive paint of the present invention are simple.
  • the pressure-sensitive paint of the present invention is a semi-solid gel substance and can be used regardless of the shape of the surface of the object to be coated.
  • the pressure sensitive paint of the present invention can be applied to a surface of any shape.
  • it can also be used as a general paint.
  • the pressure-sensitive material of the present invention is not limited to the fluorescent compounds used in the examples described in detail below, and the color tone can be adjusted by using various fluorescent compounds. Stress is applied to the dried structure by applying a pressing force or bending it (reference number 3). At this time, the pressure sensing material on the surface of the structure emits fluorescence (reference number 4).
  • the color or tone of the fluorescence emitted from the pressure sensing material on the surface of the structure changes (reference number 4).
  • the pressure-sensitive material of the present invention maintains the color tone for a long period of time, for example, close to January, after the stress or pressure load once applied is released (reference number 5).
  • changes in color tone due to pressure can be stored.
  • Similar conventional sensing paints are used for visual inspection of fragile parts such as aircraft wings / turbine fans, automobile engines, wind power generation fans, etc., but memorize changes in color due to pressure (stress) The period is not as long as that of the present invention.
  • the fluorescent color After removing the stress or pressure applied to the structure and pressure sensing material, the fluorescent color returns to its original state when heated (reference numbers 6 and 7). At this time, the period until the original color tone is restored depends on the heating period, the heating temperature and the like. When the heating temperature is 70 to 90 ° C., the original color tone is quickly restored. For example, when hot air of 70 to 90 ° C. is blown to the surface of the pressure sensing material and heated with a hot air machine, the fluorescent color returns to the original state.
  • the pressure-sensitive material of the present invention produced as described above can be applied to the surface of an object and used as a paint.
  • a temperature sensitive material etc. can be mixed with the pressure sensing material of this invention, and it can be used also as a coating material with a temperature / pressure sensor function.
  • a moisture sensitive paint it can also be used as a paint having a humidity / pressure sensor function.
  • a temperature sensitive paint and a moisture sensitive paint it is also possible to provide a combined function of a temperature sensor, a humidity sensor, and a pressure sensor.
  • the polymer compound and the clay mineral constituting the pressure sensing material of the present invention are bonded to each other, and the polymer compound serves as a binder for increasing the strength of the pressure sensing paint of the present invention.
  • the layered compound of the pressure sensing material of this embodiment forms a space containing a fluorescent compound, and is a clay mineral.
  • the main component of clay mineral is a kind of inorganic layered compound composed of oxides of silicon and aluminum.
  • the clay mineral has a negative charge on the surface, and has a cation such as sodium or calcium between the layers of the clay mineral in order to compensate for the negative charge.
  • the cationic molecules are adsorbed on the surface thereof. Molecules thus incorporated are forced into a planar structure between layers of clay minerals.
  • the fluorescent compound has a cationic property, and this cation is adsorbed on the clay mineral. Therefore, it is considered that the fluorescent compound is adsorbed on the clay mineral layer, and the fluorescent compound has a planar structure along the clay mineral layer. When the three-dimensional structure between this layer of clay minerals changes, the fluorescent compound in it fluoresces.
  • Fluorescent compounds exhibit different characteristics depending on the degree to which this three-dimensional structure changes.
  • the pressure sensing material of the present invention changes the fluorescent color depending on the degree of external pressure (stress).
  • the clay compound and the fluorescent compound are dispersed in a polymer compound to improve workability. I am trying.
  • the inventors of the present invention have succeeded for the first time in creating a system in which a clay mineral adsorbed with a fluorescent compound, a water-soluble compound and water are uniformly mixed.
  • the inventors of the present invention have succeeded for the first time in producing or producing a pressure-sensitive material that responds to pressure using a clay mineral, a polymer compound, and a fluorescent compound.
  • concentrating such a system it succeeded in making it a gel-like substance. This gel material could be uniformly applied to the surface of the object.
  • the pressure-sensitive paint of the present invention may contain an alkali metal ion originally contained in the clay mineral, a counter anion of the fluorescent compound, a counter anion possessed by the polymer compound, etc. as subcomponents contained in the main component. .
  • the counter anion of the fluorescent compound is not limited to this component, but examples thereof include iodine ions. Although the counter anion which a high molecular compound has is not limited to this, a sodium ion etc. can be illustrated.
  • the pressure sensitive paint can respond to pressing force, and its heat return is smaller than that of a conventional polymer type material.
  • FIG. 3 is a conceptual diagram illustrating the mechanism by which the pressure sensing material of the present invention emits fluorescence.
  • FIG. 3 shows a plate-like clay mineral, a fluorescent compound in which two thin hexagonal columns are connected, and a long-line polymer compound. Clay minerals are minute clay particles of the order of nm, and these clay particles are thought to have a flat plate-like structure, clogging adjacent to each other without any gaps.
  • the pressure sensing material of the present invention is composed of a plurality of plate-like layers made of plate-like clay minerals.
  • FIG. 3 shows only two examples.
  • the polymer compound and the fluorescent compound are uniformly dispersed between the clay mineral layers.
  • the layers of clay mineral are parallel to each other.
  • the two hexagonal column parts of the molecular structure of the fluorescent compound are coplanar and parallel to the clay mineral layer.
  • the length of the polymer compound is usually very long, such as several hundred nm to several mm, and is much longer than the particle size of the clay mineral, so it is considered to exist between the layers of the plurality of clay minerals.
  • the deflection of the polymer compound works to increase the thickness of the clay mineral layer or to change the parallel plane between layers.
  • the state of the clay mineral layer changes in this way, the molecular structure between them, in particular, the two hexagonal columnar parts disappear from the plane, so that the hexagonal column part exhibits fluorescence different from the coplanar state.
  • the compound having a biphenyl moiety changes the dihedral angle of the biphenyl moiety by changing the size of the gap between the clay layers, and the size of the ⁇ electron system. Changes the fluorescent color.
  • any fluorescent compound can be used as long as it is an organic compound having a biphenyl moiety.
  • the following formula 1 is an example of an organic molecule having a biphenylene structure.
  • the fluorescent compound has a structure in which a plurality of phenyl groups are adjacent to each other, and the adjacent phenyl groups can rotate.
  • the fluorescent compound can be used in a rod shape or a plate shape. With such a rod-like or plate-like shape, the biphenyl moiety of the fluorescent compound is arranged in a plane.
  • biphenyl compound used by this invention is a biphenyl compound of the following (Formula 1) and the following (Formula 2).
  • the pressure sensitive material of the present invention has the following advantages over the conventional material.
  • the pressure sensing material of the present invention can be used simply by applying it to a structure or the like that is an object to be measured. Therefore, it is not necessary to have special expertise and advanced skills when preparing the paint having the pressure sensing material of the present invention, and it is easier to use than the conventional pressure sensing paint. Became high. Furthermore, even if the pressure change is temporarily applied to the pressure sensitive paint having the pressure sensitive material of the present invention, the fluorescent color change is maintained for a long time of several days to several weeks even if the pressure (stress) is released and cannot be applied. Is done.
  • the cross-sectional area of the layered clay compound is very small, for example, about 100 molecules of the fluorescent compound, so that the structure and composition of the polymer compound and the fluorescent compound are maintained in the coating medium. Can be distributed.
  • the pressure-sensitive paint can respond to pressing force. The heat return is smaller than that of the conventional compound type material.
  • the pressure sensing material of the present invention is characterized in that a change in dihedral angle of biphenyl is used for stress sensing in the mechanism of pressure sensitivity.
  • the pressure-sensitive paint of the present invention contains a clay mineral, a polymer compound, and biphenyl molecules, which are thinly applied to the surface of the structure and dried. Thus, a thin film is obtained on the surface of the structure. This thin film produces fluorescence derived from biphenyl molecules.
  • the characteristic of this thin film compared to a thin film that is only doped with normal fluorescent molecules is that the fluorescent color changes only at the part where pressure and scratches are present.
  • the pressure-sensitive paint of the present invention can be used as a sensor paint for pressure and scratches that can be visually observed due to the difference in fluorescent color emitted from the part that is under load when applied to a structure such as a machine. Is possible.
  • the fluorescent compound an elongated rod-shaped one is used.
  • the size of the fluorescent compound is preferably shorter than the size of the clay mineral.
  • the size of the fluorescent compound is practically preferably 10 nm or less. If the size of the fluorescent compound is too small, it does not generate fluorescence with visible light, and therefore, it is practically preferable that the size is 0.5 nm or more in the major axis direction.
  • the size of the fluorescent compound is preferably 5 nm or less in the major axis direction.
  • the particles of the clay compound are fine plate-like particles having a size of 20 to 100 nm in the major axis direction and a thickness of 0.5 to 10 nm.
  • the layered clay compound is a laminate of many clay compound particles, and its cross-sectional area is much larger than that of the fluorescent compound particles, for example, 500 to 5000.
  • Example 1 for producing the pressure sensitive paint of the present invention will be described.
  • a fluorescent organic molecule biphenyl derivative BP was used as the fluorescent compound.
  • Sodium polyacrylate (hereinafter referred to as SPA) was used as the polymer compound.
  • SST Sumecton ST (hereinafter referred to as SST), which is a synthetic inorganic material manufactured by Kunimine Industry Co., Ltd. (head office: Chiyoda-ku, Tokyo, Japan), was used.
  • a method for producing a polymer hybrid membrane is described in detail in Japanese Patent No. 3855004.
  • the fluorescent compound was dissolved in a solvent miscible with water at a concentration of 2 ⁇ 10 ⁇ 5 M (2 ⁇ 10 ⁇ 5 mol / dm 3 ) to obtain 7 ml of an aqueous solution of the fluorescent compound.
  • the clay compound was dispersed in water at a concentration of 10 g / l or less to obtain 5 ml of a clay water dispersion.
  • An aqueous solution of a fluorescent compound was added to the clay aqueous dispersion to obtain a clay dispersion in which the fluorescent compound was adsorbed on the surface.
  • the doping amount of biphenyl derivative BP to SST in other words, the weight ratio of biphenyl derivative BP to SST was set to 0.1%.
  • the dispersion was heated to 80 ° C. To this heated dispersion, 11 ml of a 2 g / l water-soluble polymer compound heated to 80 ° C. was added. SST and SPA were 7: 3 by weight. The clay compound was 50 mg and the polymer compound was 22 mg. In this way, a mixture of all the solutions was dried at 80 ° C. for 30 minutes in a reduced pressure of about 200 torr (about 0.0267 MPa) to obtain a clay gel. The gel was applied to the surface of the substrate, and dried for 24 hours in an environment of 70 ° C. under normal pressure, whereby a surface coating of a pressure sensing material composed of a fluorescent compound, a clay compound, and a polymer compound was completed.
  • a polypropylene film was used in this example.
  • This surface coating was transparent to some extent with respect to visible light.
  • the reduced pressure of about 200 torr (about 0.0267 MPa) and the temperature of 80 ° C. are for drying the surface coating quickly.
  • the fluorescent compound used was an elongated rod.
  • the size of the fluorescent compound was 0.4 nm in the minor axis direction and about 2 nm in the major axis direction.
  • the size of the clay mineral used was about 1 nm in thickness and about 40 nm in length from end to end of the flat plate.
  • the substrate coated with the pressure sensitive paint of the present invention has a fluorescent color change in the bent part, the part gripped by tweezers, the part cut by the cutter, and the part where pressure (pressing force) is applied by the tip of the ballpoint pen. It has been confirmed that the occurrence is so visible.
  • FIG. 4 is a photograph showing a state in which a portion where the substrate is held with tweezers emits fluorescence.
  • FIG. 5A is a photograph showing a state in which a character is drawn by making a cut on the substrate with a cutter.
  • Fig. 5 (b) is an enlarged photograph of a part of Fig. 5 (a).
  • the structural change of the substrate was such that the fluorescence did not return to the original state even after a period of one and a half months (45 days), and the fluorescence was generated to the extent that it can be visually observed. It was confirmed that such a change in the fluorescent color returned to the original state when the changed portion was heated.
  • the hot air of 80 ° C. was sent to the substrate coated with the pressure sensitive paint by the dryer and heated, the fluorescent color could be restored to the original state.
  • FIG. 6 is a graph showing how the pressure sensitive paint of the present invention that emits fluorescence is heated and returned to its original state.
  • the vertical axis of the graph in FIG. 6 indicates the fluorescence intensity as a relative value, and the horizontal axis indicates the wavelength of the fluorescence.
  • the graph showing the fluorescence spectrum when the pressure sensitive paint of the present invention is applied is a circle ( ⁇ )
  • the fluorescence spectrum when stress is applied is a square ( ⁇ )
  • when cooled after heating. Is indicated by a triangle ( ⁇ ).
  • the substrate that is fluorescent by applying the pressure sensitive paint of the present invention and applying stress was peeled and heated in an oven set at 100 ° C. for 1 day after peeling.
  • FIG. 6 it can be seen that the shoulder of the fluorescence spectrum decreases during heating and when allowed to cool.
  • the graph when the pressure-sensitive paint of the present invention is applied and the graph when allowed to cool after heating substantially overlap, and it is demonstrated that the fluorescence color is restored to the original by heating.
  • FIG. 7 shows the measurement results when a rigid molecule is used as the fluorescent compound.
  • a molecule with a rigid skeleton is used, mechanochronism in which the fluorescence color changes due to refraction or tension does not occur.
  • the production process is exactly the same as that of the biphenyl molecule described in Example 1 above.
  • detailed conditions of this manufacturing process will be described.
  • the fluorescent compound was dissolved in a solvent mixed with water at a concentration of 2 ⁇ 10 ⁇ 5 M to obtain 7 ml of a fluorescent compound solution.
  • clay was dispersed in water at a concentration of 10 g / l or less to obtain 5 ml of a clay water dispersion.
  • a solution of the fluorescent compound was added to the clay aqueous dispersion to obtain a clay dispersion in which the fluorescent compound was adsorbed on the surface.
  • the fluorescent compound was a fluorene compound of the following formula 3, which is a rigid skeleton molecule.
  • This dispersion was heated to 80 ° C., and 11 ml of a 2 g / l water-soluble polymer compound heated to 80 ° C. was added to the dispersion.
  • a mixture of all the solutions was dried in a reduced pressure of about 200 torr (about 0.0267 MPa) at 80 ° C. for 30 minutes to obtain a clay gel. This gel was applied to the surface of an object and dried in an environment of 70 ° C. and normal pressure for 24 hours.
  • the following formula 3 is a chemical formula showing a molecular structure as a comparative example. When this Formula 3 is compared with Formula 1 and Formula 2, there is no phenyl group which can rotate.
  • FIG. 7 is a graph showing the fluorescence spectrum of the comparative example.
  • the vertical axis of the graph in FIG. 7 indicates the fluorescence intensity as a relative value, and the horizontal axis indicates the wavelength of the fluorescence.
  • the graph showing the fluorescence spectrum when the gel of the comparative example is applied is a circle ( ⁇ ), and the fluorescence spectrum when stress is applied to the circle is shown by a square ( ⁇ ). These two graphs are almost overlapped, and it can be seen that there is almost no change in the fluorescent color.
  • the present invention may be used in the field of measuring pressure (stress) on the surface of a structure.
  • stress may be used for destructive inspection, durability inspection, and the like of structures such as building structures, aircraft bodies, automobile bodies, and civil engineering machinery bodies.
  • sport equipment which receives a hit

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Abstract

The purpose of the present invention is to provide a pressure-sensing material capable of directly measuring the pressure (stress) acting on a structure, a method for producing the same, and a pressure-sensing paint. The present invention involves: preparing an aqueous solution by dissolving a fluorescent compound in a solvent which mixes with water; preparing a clay-water dispersion by dispersing clay compound particles in water; obtaining a dispersion in which the fluorescent compound adheres to the surface of the clay compound particles; and mixing this heated dispersion with a polymer compound, condensing the product thereof, and obtaining a gel-like pressure-sensing material. The gel-like pressure-sensing material may be used to coat the surface of a structure. When the surface of the structure warps due to stress, the pressure-sensing material emits fluorescent light, and this fluorescent light is retained for a long period of time.

Description

圧力感知材料、その製造方法、及び圧力感知塗料Pressure sensitive material, method for producing the same, and pressure sensitive paint
 本発明は、圧力を感知して蛍光を発する圧力感知材料、その製造方法、及び圧力感知塗料に関する。 The present invention relates to a pressure sensing material that emits fluorescence upon sensing pressure, a manufacturing method thereof, and a pressure sensing paint.
 構造体に掛かる応力を簡易に測定したいという要請は、自動車、航空機等を始め幅広い産業分野からある。例えば、構造体に掛かる応力を測定することにより、外部ないし内部からの荷重による構造体の破壊を未然に防ぎ、また、その荷重に耐えられる新材料の開発、無駄のない正確な設計が可能になる。特に、構造体に掛かる応力の測定は、航空機の翼、車のエンジン等の破断しやすい部位の特定、コンクリート構造物の劣化部分の特定、橋桁の老朽化部分の特定、風力発電機の羽根等の折損事故の予防的測定、発電所のタービンの劣化部分の予防的測定、ゴルフヘッド等のスポーツ用の道具への利用等のように、求められている機能とその用途は幅広い。 Demand to easily measure the stress applied to structures is from a wide range of industrial fields including automobiles and aircraft. For example, by measuring the stress applied to the structure, it is possible to prevent damage to the structure due to external or internal loads, and to develop new materials that can withstand such loads, and to design without waste. Become. In particular, the stress applied to the structure can be determined by identifying the fragile parts of aircraft wings, car engines, etc., identifying deteriorated parts of concrete structures, identifying aging parts of bridge girders, wind turbine blades, etc. There are a wide range of required functions and applications, such as preventive measurement of breakage accidents, preventive measurement of deteriorated parts of power plant turbines, and use for sports tools such as golf heads.
 従来は、圧力を感知するセンサーとしては、外部から応力を受けて蛍光を発する感圧材料が知られている。構造体の表面に掛かる圧力(応力)は、従来から、表面圧計測機器等を用いて測定している。また、構造体の表面に掛かる圧力の測定は、感圧材料を用いて行うことができる。この感圧材料を構造体の表面に塗布して測定する。その表面が応力等によって歪むと、表面に塗布された感圧材料が蛍光を発するか、蛍光波長が変化する。この蛍光は、目視でき、又は、撮像装置でその蛍光を撮像して分析できるため、利用者にとっては非常に便利である。 Conventionally, pressure-sensitive materials that emit fluorescence by receiving stress from the outside are known as sensors that detect pressure. Conventionally, the pressure (stress) applied to the surface of the structure has been measured using a surface pressure measuring device or the like. The pressure applied to the surface of the structure can be measured using a pressure sensitive material. The pressure sensitive material is applied to the surface of the structure and measured. When the surface is distorted by stress or the like, the pressure-sensitive material applied to the surface emits fluorescence or the fluorescence wavelength changes. This fluorescence is very convenient for the user because it is visible or can be imaged and analyzed with an imaging device.
 更に、構造体に感圧材料を塗布するだけで、構造体の表面に係る圧力を測定することができるので、高価な表面圧計測機器が不要となるという利点がある。このような感圧材料に用いる蛍光材料は、高分子化合物が主成分で、蛍光化合物が高分子化合物と化学的に結合したものや、高分子化合物に蛍光化合物を単純に分散させた材料が多い。このような材料に外部から機械的な力が加わると変化し色調を変える原理となっている。 Furthermore, since the pressure on the surface of the structure can be measured simply by applying a pressure sensitive material to the structure, there is an advantage that an expensive surface pressure measuring device is not required. Fluorescent materials used for such pressure-sensitive materials include many materials in which a high molecular compound is the main component and the fluorescent compound is chemically bonded to the high molecular compound, or a material in which the fluorescent compound is simply dispersed in the high molecular compound. . This is based on the principle of changing the color tone when a mechanical force is applied to the material from the outside.
 また、高分子化合物に蛍光化合物を分散した溶液の組成や濃度等の調製、出来上った材料を構造体に塗布する過程等においては、専門的な知識や熟練した技術が要求される。ポリマードープ型の感圧材料は蛍光化合物の分子間の距離が引っぱりによって変化する現象を利用している。感圧塗料としては、白金ポルフィリン、ルテニウムビピリジン錯体、ピレン誘導体等の蛍光材料を用いて圧力を検知するものがある。検知の原理は、酸素による蛍光材料の消光を検知している。このような、酸素の濃度によるセンシングは、航空機の応力センシングが主な用途である。 Also, in the process of preparing the composition and concentration of a solution in which a fluorescent compound is dispersed in a polymer compound, and in the process of applying the resulting material to a structure, specialized knowledge and skill are required. The polymer-doped type pressure-sensitive material utilizes a phenomenon in which the distance between molecules of the fluorescent compound is changed by pulling. As pressure-sensitive paints, there are those that detect pressure using a fluorescent material such as platinum porphyrin, ruthenium bipyridine complex, and pyrene derivative. The principle of detection is detecting quenching of the fluorescent material by oxygen. Such sensing based on oxygen concentration is mainly used for aircraft stress sensing.
 例えば、低温風洞等の低酸素環境において、安定した圧力測定を可能にするために、酸素圧力に応じた発光特性を有する感圧色素と、バインダーとしてポリトリメチルシリルプロピン(PTMSP)を含有する低酸素圧用感圧塗料が知られており、風洞試験等に利用されている(特許文献1)。また、その表面を擦る等のように力学的に刺激すると発光色が変化するメカノクロミック材料の創出が行われている。 For example, in order to enable stable pressure measurement in a low-oxygen environment such as a low-temperature wind tunnel, a low-oxygen containing a pressure-sensitive dye having luminescence characteristics corresponding to the oxygen pressure and polytrimethylsilylpropyne (PTMSP) as a binder Pressure-sensitive paint for pressure is known and used for wind tunnel tests and the like (Patent Document 1). In addition, the creation of mechanochromic materials whose emission color changes when mechanically stimulated, such as rubbing the surface, has been performed.
 例えば、有機金錯体(C65Au)2(μ-1,4-diisocyanobenzene)を含有するメカノクロミック材料は、紫外線を照射すると青色の発光を示し、力学的刺激を加えると黄色へと変化する。また、有機金錯体(C65Au)2(μ-1,4-diisocyanobenzene)に柔軟なトリエチレングリコールモノメチルエーテル鎖、又はジエチレングリコールモノメチルエーテル鎖を導入したメカノクロミック材料は、100℃のように高温に設定したハンダごてで書き込む等の刺激を与えると、黄色で発色し、しばらく放置しておくと、発色の黄色から緑色に変色していき、ほとんど見えなくなる(特許文献2)。 For example, a mechanochromic material containing an organic gold complex (C 6 F 5 Au) 2 (μ-1,4-diisocyanobenzene) emits blue light when irradiated with ultraviolet light, and turns yellow when mechanically stimulated. To do. A mechanochromic material in which a flexible triethylene glycol monomethyl ether chain or diethylene glycol monomethyl ether chain is introduced into an organic gold complex (C 6 F 5 Au) 2 (μ-1,4-diisocyanobenzene) When a stimulus such as writing with a soldering iron set at a high temperature is given, the color develops in yellow, and when left for a while, the color changes from yellow to green and becomes almost invisible (Patent Document 2).
 ポリウレタン、ポリアクリレート、及びシリコンから選ばれるエラストマーを、光化学システムと組み合わせ、圧力の変化を光学的に検知する高分子材料が知られている(非特許文献1、特許文献3を参照。)。このエラストマーの合成と光化学システムは、圧力の増大時に励起した電荷移動錯体を形成し、圧力の減少時には電荷移動錯体の形成が減少する。言い換えると、引っ張りに加えて押圧力にも応答できるという効果がある。また、ポリマーバインダー型感圧塗料が知られている(非特許文献2を参照。)。この材料は、感圧色素としてポルフィリンの一種であるPtTFPPを、バインダーとしてシリコン系ポリマーGP197、ガラスポリマーPoly(TMSP)を用いる。 Polymer materials that optically detect pressure changes by combining an elastomer selected from polyurethane, polyacrylate, and silicon with a photochemical system are known (see Non-Patent Document 1 and Patent Document 3). This elastomer synthesis and photochemical system forms an excited charge transfer complex when the pressure increases, and reduces the formation of the charge transfer complex when the pressure decreases. In other words, there is an effect that it can respond to the pressing force in addition to the pulling. Further, a polymer binder type pressure-sensitive paint is known (see Non-Patent Document 2). This material uses PtTFPP, which is a kind of porphyrin, as a pressure sensitive dye, and a silicon-based polymer GP197 and glass polymer Poly (TMSP) as a binder.
特開2005-105160号公報JP-A-2005-105160 特開2012-158678号公報JP 2012-158678 A 特表2006-508205号公報Special table 2006-508205 gazette
 しかしながら、従来の感圧塗料は、酸素の分圧等を介してセンシングしているため、構造体にかかる圧力を間接的に測定する。構造体にかかる圧力を直接測定できる感圧材料が求められている。上述の感圧材料ないし感圧塗料は、温度依存性が大きく、その改善が求められている。 However, since the conventional pressure-sensitive paint senses through the partial pressure of oxygen or the like, the pressure applied to the structure is indirectly measured. There is a need for a pressure sensitive material that can directly measure the pressure applied to the structure. The pressure-sensitive materials or pressure-sensitive paints described above are highly temperature dependent, and improvements are required.
 また、構造体にかかる圧力を直接測定できる感圧材料が上述の通り原理的に開発されているが、塗料として使えるレベルに達していない。また、上述の感圧塗料は、構造体に塗布しそれに掛かる圧力を測定しても、応力が作用した箇所が長時間記憶し保持できない。また、その表面に押圧力をセンシングすることが難しく、精度が実用に利用できるレベルに達していない。 Also, a pressure-sensitive material that can directly measure the pressure applied to the structure has been developed in principle as described above, but has not reached a level that can be used as a paint. Further, even if the pressure-sensitive paint described above is applied to a structure and the pressure applied to the structure is measured, the location where the stress is applied cannot be stored and retained for a long time. In addition, it is difficult to sense the pressing force on the surface, and the accuracy has not reached a practically usable level.
 本発明は上述のような技術背景のもとになされたものであり、下記の目的を達成する。
 本発明の目的は、構造体にかかる圧力、応力を直接測定できる圧力感知材料、その製造方法、及び圧力感知塗料を提供する。
 本発明の目的は、簡便に調整ができ、使い易い圧力感知材料、その製造方法、及び圧力感知塗料を提供する。
The present invention has been made based on the technical background as described above, and achieves the following objects.
The objective of this invention provides the pressure sensing material which can directly measure the pressure concerning a structure, and a stress, its manufacturing method, and a pressure sensing coating material.
An object of the present invention is to provide a pressure-sensitive material that can be easily adjusted and is easy to use, a manufacturing method thereof, and a pressure-sensitive paint.
 本発明1は、前記目的を達成するため、次の手段を採る。
 本発明の圧力感知材料は、
 粘土鉱物に由来する化合物の微粒子の層からなる層状化合物と、
 複数の前記層の間に挟まれた1種類以上の蛍光化合物と、
 前記層間に充填されたもので、前記微粒子より大きな分子大きさを有するバインダーと
 からなる圧力感知材料であって、
 外部から加えられた機械的な力によって前記層が変形すると、前記蛍光化合物が蛍光を発する
 ことを特徴とする。
In order to achieve the above object, the present invention 1 employs the following means.
The pressure sensing material of the present invention comprises:
A layered compound consisting of a fine particle layer of a compound derived from a clay mineral;
One or more fluorescent compounds sandwiched between a plurality of the layers;
A pressure sensing material filled between the layers and comprising a binder having a molecular size larger than that of the fine particles,
The fluorescent compound emits fluorescence when the layer is deformed by a mechanical force applied from the outside.
 本発明2は、本発明1の圧力感知材料において、前記蛍光化合物は、ビフェニレン構造を有する有機蛍光化合物であることを特徴とする。
 本発明3は、本発明1又は2の圧力感知材料において、前記蛍光化合物の粒子の大きさは、前記微粒子より小さいことを特徴とする。
The present invention 2 is the pressure sensing material of the present invention 1, wherein the fluorescent compound is an organic fluorescent compound having a biphenylene structure.
Invention 3 is characterized in that, in the pressure sensing material of Invention 1 or 2, the size of the fluorescent compound particles is smaller than that of the fine particles.
 本発明4は、本発明1又は2の圧力感知材料において、前記圧力感知材料は、着色剤、充填剤、感温剤、感温色素、及び可塑剤の中から選択される1以上の化合物を有することを特徴とする。
 本発明5の圧力感知塗料は、本発明1ないし4の圧力感知材料に記載の圧力感知材料を含有するものである。
The present invention 4 is the pressure sensing material of the present invention 1 or 2, wherein the pressure sensing material comprises one or more compounds selected from a colorant, a filler, a temperature sensitive agent, a temperature sensitive dye, and a plasticizer. It is characterized by having.
The pressure sensitive paint of the present invention 5 contains the pressure sensitive material described in the pressure sensitive material of the present invention 1 to 4.
 本発明6の圧力感知材料の製造方法は、
 1種類以上の蛍光化合物と、
 粘土鉱物に由来する化合物の微粒子の層からなる層状化合物と、
 前記層間に充填されたもので、前記微粒子より大きな分子大きさを有するバインダーと
 からなる圧力感知材料の製造方法であって、
 前記蛍光化合物の溶液を得る工程と、
 前記微粒子を水分散し粘土水分散液を得る工程と、
 前記工程で得られた前記蛍光化合物の溶液と、前記粘土水分散液と、前記バインダーとを混合して混合液を得る工程と、及び、
 前記混合液を濃縮して前記圧力感知材料を得る工程と
 からなることを特徴とする。
The manufacturing method of the pressure sensing material of the present invention 6 comprises:
One or more fluorescent compounds;
A layered compound consisting of a fine particle layer of a compound derived from a clay mineral;
A method for producing a pressure sensing material comprising a binder filled between the layers and having a molecular size larger than that of the fine particles,
Obtaining a solution of the fluorescent compound;
A step of dispersing the fine particles in water to obtain a clay water dispersion;
Mixing the solution of the fluorescent compound obtained in the step, the clay aqueous dispersion, and the binder to obtain a mixed solution; and
And concentrating the liquid mixture to obtain the pressure sensitive material.
 本発明7の圧力感知材料の製造方法は、本発明6の圧力感知材料の製造方法において、前記バインダーは、高分子化合物であることを特徴とする。
 本発明8の圧力感知材料の製造方法は、本発明6又は7の圧力感知材料の製造方法において、前記蛍光化合物は、ビフェニレン構造を有する有機分子であることを特徴とする。
The pressure sensing material manufacturing method of the present invention 7 is characterized in that in the pressure sensing material manufacturing method of the present invention 6, the binder is a polymer compound.
The pressure sensing material manufacturing method of the present invention 8 is characterized in that, in the pressure sensing material manufacturing method of the present invention 6 or 7, the fluorescent compound is an organic molecule having a biphenylene structure.
 本発明9の圧力感知材料の製造方法は、本発明6ないし8の圧力感知材料の製造方法において、前記蛍光化合物は、サイズが0.5~5nmの棒状形状を有し、前記層状化合物の前記微粒子はサイズが20~100nmであることを特徴とする。
 本発明10の圧力感知材料の製造方法は、本発明9の圧力感知材料の製造方法において、前記圧力感知材料はゲル状物であり、構造体の表面に塗布して使用されることを特徴とする。
The pressure sensing material manufacturing method of the present invention 9 is the pressure sensing material manufacturing method of the present invention 6 to 8, wherein the fluorescent compound has a rod-like shape with a size of 0.5 to 5 nm, The fine particles have a size of 20 to 100 nm.
The pressure sensing material manufacturing method of the present invention 10 is characterized in that, in the pressure sensing material manufacturing method of the present invention 9, the pressure sensing material is a gel-like material and is applied to the surface of a structure. To do.
 本発明11の圧力感知材料の製造方法は、本発明6又は7の圧力感知材料の製造方法において、前記蛍光化合物の溶液、前記粘土水分散液及び前記バインダーを混合する前に、加熱する工程を有することを特徴とする。 The method for producing a pressure sensing material of the present invention 11 includes the step of heating before mixing the fluorescent compound solution, the clay aqueous dispersion and the binder in the pressure sensing material production method of the present invention 6 or 7. It is characterized by having.
 本発明によると、次の効果が奏される。
 本発明の圧力感知材料、及び圧力感知塗料は、使用するとき高度な専門知識が必要なく、従来より使い易くなった。
 また、本発明によると、本発明の圧力感知塗料は、構造体に塗布するだけで利用でき、構造体にかかる圧力を直接測定できるようになった。
According to the present invention, the following effects can be obtained.
The pressure-sensitive material and pressure-sensitive paint of the present invention do not require a high degree of expertise when used, and are easier to use than before.
In addition, according to the present invention, the pressure-sensitive paint of the present invention can be used simply by being applied to the structure, and the pressure applied to the structure can be directly measured.
 更に、本発明の圧力感知塗料は、構造体に塗布し応力を掛けると蛍光色が変化し長時間の蛍光を保持できる。
 更に、本発明の圧力感知材料、及び圧力感知塗料は、従来は難しかった押圧力のセンシング、及び応力が作用した箇所を記憶することが可能になった。
Furthermore, when the pressure sensitive paint of the present invention is applied to a structure and subjected to stress, the fluorescent color changes and long-term fluorescence can be maintained.
Furthermore, the pressure-sensitive material and pressure-sensitive paint of the present invention have made it possible to sense the pressing force, which has been difficult in the past, and to store the location where the stress is applied.
図1は、本発明の圧力感知塗料を製造する工程を示す概念図である。FIG. 1 is a conceptual diagram showing a process for manufacturing the pressure sensitive paint of the present invention. 図2は、本発明の圧力感知塗料の使用例を示すフローチャートである。FIG. 2 is a flowchart showing an example of use of the pressure sensitive paint of the present invention. 図3は、本発明の圧力感知材料が蛍光を発するメカニズムについて図示した概念図である。FIG. 3 is a conceptual diagram illustrating a mechanism in which the pressure sensing material of the present invention emits fluorescence. 図4は、本発明の圧力感知塗料を塗られた基板をピンセットで掴んでいた部分が蛍光を発する様子を示す写真である。FIG. 4 is a photograph showing a state in which a portion where the substrate coated with the pressure sensitive paint of the present invention is gripped with tweezers emits fluorescence. 図5は、本発明の圧力感知塗料を塗られた基板上にカッターで切り込みを入れて字を描いた様子を示す写真である。FIG. 5 is a photograph showing a state in which a character is drawn by cutting with a cutter on a substrate coated with the pressure sensitive paint of the present invention. 図6は、本発明の圧力感知塗料を加熱して元に戻す実験結果を示すグラフである。FIG. 6 is a graph showing the results of an experiment in which the pressure sensitive paint of the present invention is heated and returned to its original state. 図7は、蛍光化合物に剛直な分子を用いた場合の測定結果を図示している。FIG. 7 shows the measurement results when a rigid molecule is used as the fluorescent compound.
 以下、本発明の実施の形態を説明する。本実施の形態の圧力感知材料は、粘土鉱物に由来の層状化合物の層間に、蛍光化合物と高分子化合物とを加熱溶解させた溶液を挿入させ、その後放冷して固めたものである。外部から、機械的な圧力(応力)が付加された場合に、層状化合物の層がたわむ、又は破壊される等のように変形すると、その層間の中の蛍光化合物が蛍光を発する。すなわち、外部から機械的な圧力がかかると、層状化合物の層がたわみ、高分子化合物の分子構造が変化して、再配列すると共に、層状化合物の層間が変化し、その中の蛍光化合物の構造が変化して蛍光色を変化させるものと考えられる。層状化合物の層が破壊された場合にも、蛍光化合物の構造が変化し、同様に蛍光色を変化させるものと考えられる。 Hereinafter, embodiments of the present invention will be described. The pressure sensing material of the present embodiment is obtained by inserting a solution in which a fluorescent compound and a polymer compound are heated and dissolved between layers of a layered compound derived from clay mineral, and then allowing to cool and solidifying. When mechanical pressure (stress) is applied from the outside and the layered compound is deformed such that the layer of the layered compound is bent or broken, the fluorescent compound in the layer emits fluorescence. That is, when mechanical pressure is applied from the outside, the layer of the layered compound bends, the molecular structure of the polymer compound changes and rearranges, and the layers of the layered compound change, and the structure of the fluorescent compound therein Is considered to change the fluorescent color. Even when the layer of the layered compound is destroyed, it is considered that the structure of the fluorescent compound is changed and the fluorescent color is similarly changed.
 〔構成成分〕
 本実施の形態の圧力感知材料は、基本的に、層状化合物と、高分子化合物のようなバインダーと、蛍光化合物からなる。この層状化合物は、粘土鉱物に由来する数十nmオーダーの微粒子で、微粒子同士が隣接して層を形成する。圧力感知材料は複数の層の層状化合物からなり、これらの層間に、蛍光化合物を挟む。層状化合物と蛍光化合物は、バインダーに分散される。
〔Structural component〕
The pressure sensing material of the present embodiment basically comprises a layered compound, a binder such as a polymer compound, and a fluorescent compound. This layered compound is fine particles of the order of several tens of nm derived from clay minerals, and the fine particles are adjacent to each other to form a layer. The pressure-sensitive material is composed of a plurality of layered compounds, and a fluorescent compound is sandwiched between these layers. The layered compound and the fluorescent compound are dispersed in a binder.
 層状化合物は、粘土鉱物に由来するため粘土化合物ということができる。別の言い方をすると、粘土化合物の層間には、例えば高分子化合物が充填され、粘土鉱物に由来する層状化合物の層と層の間にバインダーとしての役割をする。バインダーとしては、高分子化合物が好適に利用される。バインダーとしては、水溶性のポリマーであれば任意の高分子化合物を使用することができる。バインダーとしては、熱可塑性の高分子化合物がより好ましく、例えば、水溶性のポリマーやジメチルホルムアミド(DMF)のような水と相溶性のある極性溶媒に溶解性が高いポリマーが特に好ましい。層状化合物は、バインダーと蛍光化合物の構造と組成を保持したまま塗料の媒質に分散している。 Since the layered compound is derived from a clay mineral, it can be called a clay compound. In other words, for example, a polymer compound is filled between the layers of the clay compound, and serves as a binder between the layers of the layered compound derived from the clay mineral. As the binder, a polymer compound is preferably used. As the binder, any high molecular compound can be used as long as it is a water-soluble polymer. As the binder, a thermoplastic polymer compound is more preferable, for example, a water-soluble polymer or a polymer having high solubility in a polar solvent compatible with water such as dimethylformamide (DMF) is particularly preferable. The layered compound is dispersed in the coating medium while maintaining the structure and composition of the binder and the fluorescent compound.
 〔製造工程〕
 図1は、本発明の圧力感知塗料を製造する工程を示す概念図である。本発明の圧力感知材料ないし圧力感知塗料を製造する工程を、図1を参照しながら、説明する。まず、蛍光化合物と層状の粘土化合物を用意する。蛍光色素等の蛍光化合物を水に混和する溶媒に溶解し水溶液を得る(第1工程)。そして、粘土化合物の粒子を水に分散し、粘土水分散液を得る(第2工程)。この第1工程と第2工程は、平行して行うことも、工程の順序を逆にして行うこともできる。
〔Manufacturing process〕
FIG. 1 is a conceptual diagram showing a process for manufacturing the pressure sensitive paint of the present invention. A process of manufacturing the pressure sensitive material or pressure sensitive paint of the present invention will be described with reference to FIG. First, a fluorescent compound and a layered clay compound are prepared. A fluorescent compound such as a fluorescent dye is dissolved in a solvent miscible with water to obtain an aqueous solution (first step). And the particle | grains of a clay compound are disperse | distributed to water and a clay water dispersion liquid is obtained (2nd process). The first step and the second step can be performed in parallel or in reverse order.
 次に、粘土水分散液に、蛍光化合物の水溶液を加え、蛍光化合物が表面に吸着した粘土化合物の分散液を得る(第3工程)。このとき、粘土水分散液に対する蛍光化合物の割合は、重量比で、0.1~1%である。その後、この分散液を70~90℃の温度で加熱する(第4工程)。高分子化合物(高分子ポリマー)を第4工程と同じ温度で加熱する(第5工程)。この第4工程と第5工程は、平行して行われることも、工程の順序を逆に行うこともできる。この加熱時の加熱手段は、水浴、油浴、砂浴、オーブン等のように、公知の任意の加熱手段を利用する。 Next, an aqueous solution of the fluorescent compound is added to the clay aqueous dispersion to obtain a clay compound dispersion in which the fluorescent compound is adsorbed on the surface (third step). At this time, the ratio of the fluorescent compound to the clay aqueous dispersion is 0.1 to 1% by weight. Thereafter, the dispersion is heated at a temperature of 70 to 90 ° C. (fourth step). The polymer compound (polymer polymer) is heated at the same temperature as in the fourth step (fifth step). The fourth step and the fifth step can be performed in parallel, or the order of the steps can be reversed. As the heating means at the time of heating, any known heating means such as a water bath, an oil bath, a sand bath, an oven or the like is used.
 加熱時に、撹拌すると溶液が均一に加熱される。加熱された分散液と高分子化合物を混合する(第6工程)。このとき、粘土化合物と高分子化合物の混合比は、重量比で約5:2である。粘土化合物と高分子化合物を混合するとき、均一になるように充分に撹拌する。第6工程で混合された溶液を濃縮させて粘土のゲル(以下、粘土ゲルと言う。)を得る(第7工程)。濃縮時の環境は、常温、常圧で行う。この溶液を早く濃縮させるためには、濃縮環境を減圧、高温にして濃縮させる方法であっても良い。 When stirring, the solution is heated uniformly when stirred. The heated dispersion and the polymer compound are mixed (sixth step). At this time, the mixing ratio of the clay compound and the polymer compound is about 5: 2 by weight. When mixing the clay compound and the polymer compound, the mixture is sufficiently stirred to be uniform. The solution mixed in the sixth step is concentrated to obtain a clay gel (hereinafter referred to as clay gel) (seventh step). The environment for concentration is normal temperature and normal pressure. In order to concentrate this solution quickly, a method of concentrating the concentrated environment under reduced pressure and high temperature may be used.
 図2は、得られた粘土ゲルの使用例を示すフローチャートであり、これを参照しながら、粘土ゲルの利用例を説明する。まず、得られた粘土ゲルを基板等の物体や構造物等の構造体(「被塗布物体」ということもできる。)の表面に塗布する(参照番号1)。この塗布後は、粘土ゲルが塗布された構造体を乾燥させる(参照番号2)。この乾燥時の環境は、常温、常圧で行うことができるが、高温環境にした場合は早く乾燥する。このように、本発明の圧力感知塗料の成分の調整、製造は簡単である。 FIG. 2 is a flowchart showing an example of using the obtained clay gel, and an example of using the clay gel will be described with reference to this flowchart. First, the obtained clay gel is applied to the surface of an object such as a substrate or a structure such as a structure (also referred to as an “object to be applied”) (reference number 1). After this application, the structure to which the clay gel is applied is dried (reference number 2). This drying environment can be performed at normal temperature and normal pressure, but when it is in a high temperature environment, it dries quickly. Thus, the adjustment and manufacture of the components of the pressure sensitive paint of the present invention are simple.
 詳しくは、本発明の圧力感知塗料は、半固体のゲル状物質であり、被塗布物体の表面の形状にかかわらず利用できる。言い換えると、本発明の圧力感知塗料は、任意の形状の表面に塗布して利用することができる。無論、一般の塗料としても用いることができる。更に、本発明の圧力感知材料には、以下に詳記する実施例に用いた蛍光化合物に限らず、様々な蛍光化合物を用いることで、色調の調整が可能である。乾燥した構造体に押圧力を加えたり、折り曲げたりして応力を付加する(参照番号3)。このとき、構造体の表面の圧力感知材料が蛍光を発する(参照番号4)。 Specifically, the pressure-sensitive paint of the present invention is a semi-solid gel substance and can be used regardless of the shape of the surface of the object to be coated. In other words, the pressure sensitive paint of the present invention can be applied to a surface of any shape. Of course, it can also be used as a general paint. Furthermore, the pressure-sensitive material of the present invention is not limited to the fluorescent compounds used in the examples described in detail below, and the color tone can be adjusted by using various fluorescent compounds. Stress is applied to the dried structure by applying a pressing force or bending it (reference number 3). At this time, the pressure sensing material on the surface of the structure emits fluorescence (reference number 4).
 又は、構造体の表面の圧力感知材料が発している蛍光の色や色調が変化する(参照番号4)。本発明の圧力感知材料には、一度掛かっていた応力ないし圧力の負荷を解除した後も、長期間、例えば1月近く、色調が変化したまま保持される(参照番号5)。言い換えると、圧力による色調変化を記憶できる。従来の類似のセンシング塗料は、航空機の羽・タービンファン、自動車のエンジン、風力発電のファン等の脆くなりやすい部位の視覚的調査に用いられているが、圧力(応力)による色調変化を記憶する期間は本発明のものほど長くない。 Or, the color or tone of the fluorescence emitted from the pressure sensing material on the surface of the structure changes (reference number 4). The pressure-sensitive material of the present invention maintains the color tone for a long period of time, for example, close to January, after the stress or pressure load once applied is released (reference number 5). In other words, changes in color tone due to pressure can be stored. Similar conventional sensing paints are used for visual inspection of fragile parts such as aircraft wings / turbine fans, automobile engines, wind power generation fans, etc., but memorize changes in color due to pressure (stress) The period is not as long as that of the present invention.
 また、構造体及び圧力感知材料に掛かっていた応力ないし圧力を除いた後、加熱すると蛍光色が元の状態に戻る(参照番号6、7)。このとき元の色調に戻るまでの期間は、加熱期間と、加熱温度等による。加熱温度が70~90℃であると早く元の色調に戻る。例えば、温風機で70~90℃の温風を圧力感知材料の表面に送風して加熱すると、蛍光色が元の状態に戻る。 Also, after removing the stress or pressure applied to the structure and pressure sensing material, the fluorescent color returns to its original state when heated (reference numbers 6 and 7). At this time, the period until the original color tone is restored depends on the heating period, the heating temperature and the like. When the heating temperature is 70 to 90 ° C., the original color tone is quickly restored. For example, when hot air of 70 to 90 ° C. is blown to the surface of the pressure sensing material and heated with a hot air machine, the fluorescent color returns to the original state.
 〔塗料〕
 上述のように製造された本発明の圧力感知材料は、物体の表面に塗布して塗料として使用することができる。また、本発明の圧力感知材料に感温材料等を混合し、温度・圧力センサー機能を持つ塗料としても使用することができる。更に、本発明の圧力感知材料を感湿塗料と混合することで、湿度・圧力センサー機能を持つ塗料としても使用することができる。さらに、本発明の圧力感知材料を感温塗料、感湿塗料との混合により、さらに、温度センサー、湿度センサー、圧力センサーの複合機能を付与することも可能である。
〔paint〕
The pressure-sensitive material of the present invention produced as described above can be applied to the surface of an object and used as a paint. Moreover, a temperature sensitive material etc. can be mixed with the pressure sensing material of this invention, and it can be used also as a coating material with a temperature / pressure sensor function. Furthermore, by mixing the pressure sensing material of the present invention with a moisture sensitive paint, it can also be used as a paint having a humidity / pressure sensor function. Furthermore, by combining the pressure sensing material of the present invention with a temperature sensitive paint and a moisture sensitive paint, it is also possible to provide a combined function of a temperature sensor, a humidity sensor, and a pressure sensor.
 〔蛍光のメカニズムについて〕
 本発明の圧力感知材料を構成する高分子化合物と粘土鉱物は互いに接着しており、高分子化合物は本発明の圧力感知塗料の強度を高めるバインダーの役割を果たしている。本実施の形態の圧力感知材料の層状化合物は、蛍光化合物を内蔵する空間を形成するもので、粘土鉱物である。一般的に、粘土鉱物の主成分は、ケイ素とアルミニウムの酸化物からなる無機層状化合物の一種である。粘土鉱物は表面に負電荷を帯びており、その負電荷を補償するために、粘土鉱物の層の間にナトリウムやカルシウム等のカチオンを有する。
[Fluorescence mechanism]
The polymer compound and the clay mineral constituting the pressure sensing material of the present invention are bonded to each other, and the polymer compound serves as a binder for increasing the strength of the pressure sensing paint of the present invention. The layered compound of the pressure sensing material of this embodiment forms a space containing a fluorescent compound, and is a clay mineral. In general, the main component of clay mineral is a kind of inorganic layered compound composed of oxides of silicon and aluminum. The clay mineral has a negative charge on the surface, and has a cation such as sodium or calcium between the layers of the clay mineral in order to compensate for the negative charge.
 このカチオンは、他のカチオン性の分子と容易に交換できるため、カチオン性分子をその表面に吸着する。このように取り込まれた分子は、粘土鉱物の層と層の間で強制的に平面的な構造になる。
本発明の場合は、蛍光化合物がカチオン性を有し、このカチオンが粘土鉱物に吸着される。よって、蛍光化合物が粘土鉱物の層に吸着され、蛍光化合物が粘土鉱物の層に沿った平面的な構造になると考えられる。粘土鉱物のこの層とその間の立体構造が変わると、その中の蛍光化合物は蛍光を発する。
Since this cation can be easily exchanged with other cationic molecules, the cationic molecules are adsorbed on the surface thereof. Molecules thus incorporated are forced into a planar structure between layers of clay minerals.
In the case of the present invention, the fluorescent compound has a cationic property, and this cation is adsorbed on the clay mineral. Therefore, it is considered that the fluorescent compound is adsorbed on the clay mineral layer, and the fluorescent compound has a planar structure along the clay mineral layer. When the three-dimensional structure between this layer of clay minerals changes, the fluorescent compound in it fluoresces.
 この立体構造が変わる度合いによって、蛍光化合物は異なった特性を示す。このことを利用することで、本発明の圧力感知材料は、外部圧力(応力)の度合いによって蛍光色を変化させている。また、粘土化合物の層と蛍光化合物を有する塗料を、構造体の表面に塗布する際に均一性を確保するために、粘土化合物と蛍光化合物を高分子化合物に分散させて、加工性の向上を図っている。 Fluorescent compounds exhibit different characteristics depending on the degree to which this three-dimensional structure changes. By utilizing this fact, the pressure sensing material of the present invention changes the fluorescent color depending on the degree of external pressure (stress). Also, in order to ensure uniformity when a paint having a clay compound layer and a fluorescent compound is applied to the surface of the structure, the clay compound and the fluorescent compound are dispersed in a polymer compound to improve workability. I am trying.
 本発明の発明者等は、蛍光化合物が吸着した粘土鉱物と水溶性の化合物と水が均一に混合した系を生み出すことに初めて成功した。言い換えると、本発明の発明者等は、粘土鉱物と、高分子化合物と、蛍光化合物を用いて、圧力に応答する感圧材料を作製ないし製造することに初めて成功した。また、このような系を濃縮することで、ゲル状の物質とすることに成功した。このゲル状物質は、物体の表面に均一に塗布可能であった。 The inventors of the present invention have succeeded for the first time in creating a system in which a clay mineral adsorbed with a fluorescent compound, a water-soluble compound and water are uniformly mixed. In other words, the inventors of the present invention have succeeded for the first time in producing or producing a pressure-sensitive material that responds to pressure using a clay mineral, a polymer compound, and a fluorescent compound. Moreover, by concentrating such a system, it succeeded in making it a gel-like substance. This gel material could be uniformly applied to the surface of the object.
 本発明の圧力感知塗料は、主成分に含まれる副成分として、粘土鉱物が元々もっているアルカリ金属イオン、蛍光化合物の対アニオン、高分子化合物が持つ対アニオン等を含有したものであっても良い。蛍光化合物の対アニオンは、この成分に限定はされないが、ヨウ素イオン等を例示することができる。高分子化合物が持つ対アニオンは、これに限定はされないが、ナトリウムイオン等を例示できる。感圧塗料は、高分子化合物型の材料の場合、押圧力に対しても応答でき、その熱戻りが従来のポリマー型の材料よりは小さい。 The pressure-sensitive paint of the present invention may contain an alkali metal ion originally contained in the clay mineral, a counter anion of the fluorescent compound, a counter anion possessed by the polymer compound, etc. as subcomponents contained in the main component. . The counter anion of the fluorescent compound is not limited to this component, but examples thereof include iodine ions. Although the counter anion which a high molecular compound has is not limited to this, a sodium ion etc. can be illustrated. In the case of a polymer compound type material, the pressure sensitive paint can respond to pressing force, and its heat return is smaller than that of a conventional polymer type material.
 図3は、本発明の圧力感知材料が蛍光を発するメカニズムについて図示した概念図である。図3においては、板状の粘土鉱物、二つの薄い六角柱をつなげた状態の蛍光化合物、そして、長い線の高分子化合物を図示している。粘土鉱物は、nmオーダーの微小な粘土粒子であり、これらの粘土粒子は少しも隙間なく隣接して詰まって、平面の板状の構造をしていると考えられる。本発明の圧力感知材料は板状の粘土鉱物からなる複数の板状層からなるが、図3には2枚のみを例示して図示している。 FIG. 3 is a conceptual diagram illustrating the mechanism by which the pressure sensing material of the present invention emits fluorescence. FIG. 3 shows a plate-like clay mineral, a fluorescent compound in which two thin hexagonal columns are connected, and a long-line polymer compound. Clay minerals are minute clay particles of the order of nm, and these clay particles are thought to have a flat plate-like structure, clogging adjacent to each other without any gaps. The pressure sensing material of the present invention is composed of a plurality of plate-like layers made of plate-like clay minerals. FIG. 3 shows only two examples.
 圧力感知塗料は、作製された直後の状態では、粘土鉱物の層間で、高分子化合物と蛍光化合物が均一に分散している。粘土鉱物の各層は互いに平行平面になっている。蛍光化合物の分子の構造の二つの六角柱部分は共平面になった状態で、粘土鉱物の層と平行してある。高分子化合物の長さは、通常数100nm~数mmと非常に長く、粘土鉱物の粒子の大きさよりも遥かに長いので複数の粘土鉱物の層間に渡って存在すると考えられる。この様な構造体に、外部から圧力(応力)が作用すると、メカニカルな応力によって高分子化合物にたわみが生じる。 In the state immediately after the pressure sensitive paint is produced, the polymer compound and the fluorescent compound are uniformly dispersed between the clay mineral layers. The layers of clay mineral are parallel to each other. The two hexagonal column parts of the molecular structure of the fluorescent compound are coplanar and parallel to the clay mineral layer. The length of the polymer compound is usually very long, such as several hundred nm to several mm, and is much longer than the particle size of the clay mineral, so it is considered to exist between the layers of the plurality of clay minerals. When pressure (stress) is applied to such a structure from the outside, the polymer compound is deflected by mechanical stress.
 高分子化合物のたわみは、粘土鉱物の層間の厚さを拡げるか、層間の平行平面の状態を崩して変化させる働きをする。このように粘土鉱物の層の状態が変化するとその間の分子の構造が、特に二つの六角柱状部位が、平面ではなくなることで、六角柱部分が共平面の状態とは異なった蛍光を示すようになる。本発明の実施例1の蛍光化合物のように、ビフェニル部位を持つ化合物は、粘土層間の隙間の大きさが変化する事によって、ビフェニル部位の二面角が変化して、π電子系の大きさが変化することで、蛍光色が変化する。 The deflection of the polymer compound works to increase the thickness of the clay mineral layer or to change the parallel plane between layers. When the state of the clay mineral layer changes in this way, the molecular structure between them, in particular, the two hexagonal columnar parts disappear from the plane, so that the hexagonal column part exhibits fluorescence different from the coplanar state. Become. Like the fluorescent compound of Example 1 of the present invention, the compound having a biphenyl moiety changes the dihedral angle of the biphenyl moiety by changing the size of the gap between the clay layers, and the size of the π electron system. Changes the fluorescent color.
 蛍光化合物は、ビフェニル部位を有する有機化合物であれば任意の蛍光化合物が利用できる。次の式1は、ビフェニレン構造を有する有機分子の例である。式1から分かるように、蛍光化合物は、複数のフェニル基が隣接した構造のものであり、隣接するフェニル基同士が回転できる。蛍光化合物はビフェニル部位を有する限り、形状が棒状でも板状でも利用することができる。このような棒状又は板状の形状にすると、蛍光化合物のビフェニル部位が平面に配置される。 As the fluorescent compound, any fluorescent compound can be used as long as it is an organic compound having a biphenyl moiety. The following formula 1 is an example of an organic molecule having a biphenylene structure. As can be seen from Formula 1, the fluorescent compound has a structure in which a plurality of phenyl groups are adjacent to each other, and the adjacent phenyl groups can rotate. As long as the fluorescent compound has a biphenyl moiety, the fluorescent compound can be used in a rod shape or a plate shape. With such a rod-like or plate-like shape, the biphenyl moiety of the fluorescent compound is arranged in a plane.
 外部の機械的な応力によって、このビフェニル部位が回転し平面ではなくなる。これにより、蛍光色に変化が生じると考えられる。本発明で使用されるビフェニル化合物としては、下記(式1)、下記(式2)のビフェニル化合物である。
Figure JPOXMLDOC01-appb-C000001
Figure JPOXMLDOC01-appb-C000002
Due to external mechanical stress, this biphenyl moiety rotates and is no longer flat. This is considered to cause a change in the fluorescent color. As a biphenyl compound used by this invention, it is a biphenyl compound of the following (Formula 1) and the following (Formula 2).
Figure JPOXMLDOC01-appb-C000001
Figure JPOXMLDOC01-appb-C000002
 〔作用、効果〕
 本発明の圧力感知材料は、従来の材料と比べて、次の利点を有する。本発明の圧力感知材料は、被測定物である構造体等に塗布するだけで、簡便に利用できる。従って、本発明の圧力感知材料を有する塗料の調製と、その使用時に、特別な専門知識、高度な技能を有する必要がなく、従来の圧力感知塗料と比べ使いやすくなり、圧力感知塗料の汎用性が高くなった。更に、本発明の圧力感知材料を有する圧力感知塗料に一時的に圧力が掛かって生じた蛍光色の変化が、圧力(応力)が解放され掛からなくなっても、数日から数週間と長時間保持される。
(Action, effect)
The pressure sensitive material of the present invention has the following advantages over the conventional material. The pressure sensing material of the present invention can be used simply by applying it to a structure or the like that is an object to be measured. Therefore, it is not necessary to have special expertise and advanced skills when preparing the paint having the pressure sensing material of the present invention, and it is easier to use than the conventional pressure sensing paint. Became high. Furthermore, even if the pressure change is temporarily applied to the pressure sensitive paint having the pressure sensitive material of the present invention, the fluorescent color change is maintained for a long time of several days to several weeks even if the pressure (stress) is released and cannot be applied. Is done.
 本発明の圧力感知材料において、層状の粘土化合物の断面積は、一例では蛍光化合物の分子の100個程度と非常に小さく、高分子化合物と蛍光化合物の構造と組成を保持したまま塗料の媒質に分散できる。感圧塗料は、高分子化合物型の材料の場合、押圧力に対しても応答できる。熱戻りが従来の化合物型の材料よりは小さい。このように、引っ張り、圧縮、曲げ、せん断等の応力、及び引っ掻き傷等による負荷が掛かった箇所を作用する力が解消しても、その掛った力を圧力感知塗料が記憶することができるため、応力が働いた箇所を、後で確認できるという顕著な効果がある。 In the pressure sensing material of the present invention, the cross-sectional area of the layered clay compound is very small, for example, about 100 molecules of the fluorescent compound, so that the structure and composition of the polymer compound and the fluorescent compound are maintained in the coating medium. Can be distributed. In the case of a polymer compound type material, the pressure-sensitive paint can respond to pressing force. The heat return is smaller than that of the conventional compound type material. As described above, even if the force acting on the place where the load is applied due to stress such as tension, compression, bending, and shear, and scratches is eliminated, the applied force can be stored in the pressure sensitive paint. There is a remarkable effect that the place where the stress is applied can be confirmed later.
 本発明の圧力感知材料は、感圧のメカニズムには、ビフェニルの二面角の変化を応力のセンシングに用いていることが一つの特徴である。本発明の圧力感知塗料は、粘土鉱物と高分子化合物とビフェニル分子を含有し、これを構造体の表面に薄く塗り、乾燥させる。このように、構造体の表面に薄膜が得られる。この薄膜は、ビフェニル分子に由来する蛍光を生じる。 The pressure sensing material of the present invention is characterized in that a change in dihedral angle of biphenyl is used for stress sensing in the mechanism of pressure sensitivity. The pressure-sensitive paint of the present invention contains a clay mineral, a polymer compound, and biphenyl molecules, which are thinly applied to the surface of the structure and dried. Thus, a thin film is obtained on the surface of the structure. This thin film produces fluorescence derived from biphenyl molecules.
 通常の蛍光性分子をドープしただけの薄膜と比べた本薄膜の特徴は、圧力や傷が付いた部分だけ蛍光の色が変化する。また、図による例示をしていないが、本発明の圧力感知塗料を塗られた薄膜フィルムを折り曲げると蛍光色の変化が起こることが確認された。このことから、本発明の圧力感知塗料は、機械等の構造体に塗布すれば、負荷が掛かっている部位が発する蛍光色の違いから、目視で観察できる圧力や傷等のセンサー塗料として用いることが可能である。 The characteristic of this thin film compared to a thin film that is only doped with normal fluorescent molecules is that the fluorescent color changes only at the part where pressure and scratches are present. Although not illustrated by the figure, it was confirmed that a fluorescent color change occurs when the thin film coated with the pressure sensitive paint of the present invention is folded. For this reason, the pressure-sensitive paint of the present invention can be used as a sensor paint for pressure and scratches that can be visually observed due to the difference in fluorescent color emitted from the part that is under load when applied to a structure such as a machine. Is possible.
 〔サイズ〕
 蛍光化合物としては、細長い棒状のものを利用する。蛍光化合物のサイズは、粘土鉱物のサイズより短い方が望ましい。例えば、粘土鉱物の粒子のサイズが40nm程度の場合、蛍光化合物のサイズは、実用的には、10nm以下であるものが好ましい。蛍光化合物のサイズは、あまり小さすぎても可視光で蛍光を生じなくなるので、実用的には長軸方向で0.5nm以上であるものが好ましい。
〔size〕
As the fluorescent compound, an elongated rod-shaped one is used. The size of the fluorescent compound is preferably shorter than the size of the clay mineral. For example, when the size of the clay mineral particles is about 40 nm, the size of the fluorescent compound is practically preferably 10 nm or less. If the size of the fluorescent compound is too small, it does not generate fluorescence with visible light, and therefore, it is practically preferable that the size is 0.5 nm or more in the major axis direction.
 蛍光化合物は、サイズが大きすぎると捩れ等によって機械的な損傷を受けやすくなる。機械的な損傷を受けた蛍光化合物は、蛍光を発生しなくなったりすることがある。また、本発明の特徴の一つでもある、加熱によって蛍光色が元の状態に戻ることができなくなる。よって、蛍光化合物のサイズは、長軸方向で5nm以下であることが好ましい。粘土化合物の粒子は、微小な板状ものであり、そのサイズが長軸方向で20~100nmであり、厚さは0.5nm~10nmである。層状の粘土化合物は、粘土化合物の粒子を多数積層したものであり、その断面積は、蛍光化合物の粒子よりずっと大きく、例えば500~5000個である。 Fluorescent compounds are susceptible to mechanical damage due to twisting and the like when the size is too large. A fluorescent compound that has been mechanically damaged may cease to emit fluorescence. In addition, the fluorescent color cannot be returned to the original state by heating, which is one of the characteristics of the present invention. Therefore, the size of the fluorescent compound is preferably 5 nm or less in the major axis direction. The particles of the clay compound are fine plate-like particles having a size of 20 to 100 nm in the major axis direction and a thickness of 0.5 to 10 nm. The layered clay compound is a laminate of many clay compound particles, and its cross-sectional area is much larger than that of the fluorescent compound particles, for example, 500 to 5000.
 〔用途〕
 精密機器の輸送の品質管理、飛行機の羽や車のエンジンの脆弱になりやすい部位の調査、コンクリート構造物の落下事故の防止、橋桁の老朽化の未然防止、風力発電機の折損事故予防、発電所のタービンのメンテナンス、スポーツの練習用の道具への利用、歩き方の矯正、歯の噛み合わせの診断、子供のおもちゃの落書き板、犯人に気づかれずに足形をとること等への利用が考えられる。スポーツ用の道具としては、例えば、野球やゴルフ等の打球とバットあるいはクラブの接触箇所の調査に利用できる。このように、スポーツ用の道具としては、打撃を受ける側と、打撃を与える側の両方を調査するとき利用することができる。更に、遊具や精密機器の輸送管理等、幅広い用途が見込める。
[Use]
Quality control of precision equipment transportation, investigation of vulnerable parts of airplane wings and car engines, prevention of accidental fall of concrete structures, prevention of aging bridge girders, prevention of breakage of wind power generators, power generation It is considered to be used for maintenance of the turbine in the office, use for sports practice tools, correction of walking, diagnosis of tooth meshing, children's toy graffiti board, taking a foot shape without being noticed by the criminal It is done. As a tool for sports, for example, it can be used for investigating contact points between a hit ball such as baseball and golf and a bat or club. In this way, as a sporting tool, it can be used when investigating both the side receiving the hit and the side giving the hit. Furthermore, it can be used for a wide range of applications such as transport management of play equipment and precision equipment.
 〔本発明の圧力感知塗料の作製 〕
 次に、本発明の圧力感知塗料を作製する実施例1を説明する。本実施例1において、蛍光化合物として、蛍光性有機分子のビフェニル誘導体BPを用いた。高分子化合物としてSodium polyacrylate(以下、SPAという。)を用いた。粘土化合物としては、クニミネ工業株式会社(本社:日本国東京都千代田区)製の合成無機材であるスメクトンST(以下、SSTと言う。)を用いた。
[Preparation of pressure-sensitive paint of the present invention]
Next, Example 1 for producing the pressure sensitive paint of the present invention will be described. In Example 1, a fluorescent organic molecule biphenyl derivative BP was used as the fluorescent compound. Sodium polyacrylate (hereinafter referred to as SPA) was used as the polymer compound. As the clay compound, Sumecton ST (hereinafter referred to as SST), which is a synthetic inorganic material manufactured by Kunimine Industry Co., Ltd. (head office: Chiyoda-ku, Tokyo, Japan), was used.
 ポリマーハイブリッド膜の作製法は、特許第3855004号に詳しく記載されている。まず、蛍光化合物を2×10-5M(2×10-5mol/dm3)の濃度で水に混和する溶媒に溶解し、7mlの蛍光化合物の水溶液を得た。次に、粘土化合物を10g/l以下の濃度で水に分散し、5mlの粘土水分散液を得た。粘土水分散液に、蛍光化合物の水溶液を加え、蛍光化合物が表面に吸着した粘土の分散液を得た。SSTへのビフェニル誘導体BPのドープ量、言い換えるとSSTに対するビフェニル誘導体BPの重量比は0.1%にした。 A method for producing a polymer hybrid membrane is described in detail in Japanese Patent No. 3855004. First, the fluorescent compound was dissolved in a solvent miscible with water at a concentration of 2 × 10 −5 M (2 × 10 −5 mol / dm 3 ) to obtain 7 ml of an aqueous solution of the fluorescent compound. Next, the clay compound was dispersed in water at a concentration of 10 g / l or less to obtain 5 ml of a clay water dispersion. An aqueous solution of a fluorescent compound was added to the clay aqueous dispersion to obtain a clay dispersion in which the fluorescent compound was adsorbed on the surface. The doping amount of biphenyl derivative BP to SST, in other words, the weight ratio of biphenyl derivative BP to SST was set to 0.1%.
 この分散液を80℃まで加熱した。加熱されたこの分散液に、同じく80℃に加熱した2g/lの水溶性の高分子化合物を11ml加えた。SSTとSPAは、重量比で7:3であった。粘土化合物が50mg、高分子化合物22mgであった。このように、全ての溶液を混合したものを、200torr(約0.0267MPa)程度の減圧中80℃で30分乾燥させることで、粘土のゲルを得た。このゲルを基板の表面に塗布し、常圧で70℃の環境下で、24時間、乾燥させることで、蛍光化合物、粘土化合物、及び高分子化合物からなる圧力感知材料の表面塗装ができた。 The dispersion was heated to 80 ° C. To this heated dispersion, 11 ml of a 2 g / l water-soluble polymer compound heated to 80 ° C. was added. SST and SPA were 7: 3 by weight. The clay compound was 50 mg and the polymer compound was 22 mg. In this way, a mixture of all the solutions was dried at 80 ° C. for 30 minutes in a reduced pressure of about 200 torr (about 0.0267 MPa) to obtain a clay gel. The gel was applied to the surface of the substrate, and dried for 24 hours in an environment of 70 ° C. under normal pressure, whereby a surface coating of a pressure sensing material composed of a fluorescent compound, a clay compound, and a polymer compound was completed.
 基板としては、本実施例で、ポリプロピレンフィルムを利用した。この表面塗装は、可視光に対してある程度の透過するものであった。上述の乾燥は、常圧70℃の環境下であったが、常温、常圧で行うこともできる。200torr(約0.0267MPa)程度の減圧、温度80℃の環境は、表面塗装を早く乾燥させるためである。本実施例では、蛍光化合物は、細長い棒状のものを利用した。蛍光化合物のサイズは、短軸方向で0.4nm、長軸方向で約2nmであった。用いた粘土鉱物のサイズは、厚さ約1nm、平板の端から端までの長さ約40nmであった。 As the substrate, a polypropylene film was used in this example. This surface coating was transparent to some extent with respect to visible light. Although the above-mentioned drying was performed under an environment of normal pressure of 70 ° C., it can be performed at normal temperature and normal pressure. The reduced pressure of about 200 torr (about 0.0267 MPa) and the temperature of 80 ° C. are for drying the surface coating quickly. In the present example, the fluorescent compound used was an elongated rod. The size of the fluorescent compound was 0.4 nm in the minor axis direction and about 2 nm in the major axis direction. The size of the clay mineral used was about 1 nm in thickness and about 40 nm in length from end to end of the flat plate.
 〔圧力、傷への蛍光挙動の応答〕
 本発明の圧力感知塗料を塗布した基板は、折り曲げた部分、ピンセットで掴んでいた部分、カッターで切り込みを入れた部分、ボールペンのペン先で圧力(押圧力)を加えた部分が蛍光色の変化が目視できるほど生じることが確認できた。例えば、図4は、この基板をピンセットで掴んでいた部分が蛍光を発する様子を示す写真である。また、図5(a)は、この基板の上にカッターで切り込みを入れて字を描いた様子を示す写真である。
[Response of fluorescence behavior to pressure and scratches]
The substrate coated with the pressure sensitive paint of the present invention has a fluorescent color change in the bent part, the part gripped by tweezers, the part cut by the cutter, and the part where pressure (pressing force) is applied by the tip of the ballpoint pen. It has been confirmed that the occurrence is so visible. For example, FIG. 4 is a photograph showing a state in which a portion where the substrate is held with tweezers emits fluorescence. FIG. 5A is a photograph showing a state in which a character is drawn by making a cut on the substrate with a cutter.
 図5(b)は、図5(a)の一部を拡大した写真である。また、基板のこのような構造的な変化は、1ヶ月半(45日)の期間が経過しても、蛍光が元には戻らないで、目視できる程度に蛍光が発生していた。このような蛍光色の変化は、その変化した部分を加熱すると蛍光色が元の状態に戻ることが確認できた。この加熱は、実験では、ドライヤーで80℃の温風を、圧力感知塗料を塗布した基板に送って加熱すると、蛍光色を元の状態に戻すことができた。 Fig. 5 (b) is an enlarged photograph of a part of Fig. 5 (a). In addition, the structural change of the substrate was such that the fluorescence did not return to the original state even after a period of one and a half months (45 days), and the fluorescence was generated to the extent that it can be visually observed. It was confirmed that such a change in the fluorescent color returned to the original state when the changed portion was heated. In this experiment, in the experiment, when the hot air of 80 ° C. was sent to the substrate coated with the pressure sensitive paint by the dryer and heated, the fluorescent color could be restored to the original state.
 図6には、蛍光を発する本発明の圧力感知塗料を加熱して元に戻す様子を示すグラフである。図6のグラフの縦軸は、蛍光強度を相対値で表示し、横軸は蛍光の波長を示している。図6の中で、本発明の圧力感知塗料を塗布したときの蛍光スペクトルを示すグラフは丸(○)で、応力を掛けたときの蛍光スペクトルを四角(□)で、加熱後の放冷時の蛍光スペクトルを三角(△)で示している。 FIG. 6 is a graph showing how the pressure sensitive paint of the present invention that emits fluorescence is heated and returned to its original state. The vertical axis of the graph in FIG. 6 indicates the fluorescence intensity as a relative value, and the horizontal axis indicates the wavelength of the fluorescence. In FIG. 6, the graph showing the fluorescence spectrum when the pressure sensitive paint of the present invention is applied is a circle (◯), the fluorescence spectrum when stress is applied is a square (□), and when cooled after heating. Is indicated by a triangle (Δ).
 本発明の圧力感知塗料を塗布し応力を付加して蛍光を発している基板を、剥離後、1日、100℃に設定したオーブンで加熱した。図6から分かるように、蛍光スペクトルのショルダーが加熱時、そして放冷時に減少していることが分かる。蛍光スペクトルは、本発明の圧力感知塗料を塗布したときのグラフと、加熱後の放冷のときのグラフはほぼ重なっており、加熱によって、蛍光色を元に戻すことが実証している。 The substrate that is fluorescent by applying the pressure sensitive paint of the present invention and applying stress was peeled and heated in an oven set at 100 ° C. for 1 day after peeling. As can be seen from FIG. 6, it can be seen that the shoulder of the fluorescence spectrum decreases during heating and when allowed to cool. In the fluorescence spectrum, the graph when the pressure-sensitive paint of the present invention is applied and the graph when allowed to cool after heating substantially overlap, and it is demonstrated that the fluorescence color is restored to the original by heating.
 〔比較例〕
 図7は、蛍光化合物に剛直な分子を用いた場合の測定結果を図示している。この図からわかるように、剛直な骨格の分子を用いた場合、屈折や引っ張り等によって蛍光の色が変化するメカノクロニズムは起こらない。製造過程は上述の実施例1に記載したビフェニル分子の場合と全く同じである。次に、この製造過程の詳細な条件を記す。まず、蛍光化合物を2×10-5Mの濃度で水に混和する溶媒に溶解することで、7mlの蛍光化合物の溶液を得た。次に、粘土を10g/l以下の濃度で水に分散し、5mlの粘土水分散液を得た。
[Comparative example]
FIG. 7 shows the measurement results when a rigid molecule is used as the fluorescent compound. As can be seen from this figure, when a molecule with a rigid skeleton is used, mechanochronism in which the fluorescence color changes due to refraction or tension does not occur. The production process is exactly the same as that of the biphenyl molecule described in Example 1 above. Next, detailed conditions of this manufacturing process will be described. First, the fluorescent compound was dissolved in a solvent mixed with water at a concentration of 2 × 10 −5 M to obtain 7 ml of a fluorescent compound solution. Next, clay was dispersed in water at a concentration of 10 g / l or less to obtain 5 ml of a clay water dispersion.
 粘土水分散液に、蛍光化合物の溶液を加え、蛍光化合物が表面に吸着した粘土の分散液を得た。蛍光化合物は、剛直な骨格の分子である下記式3のフルオレン系化合物であった。この分散液を80℃まで加熱し、この分散液に、同じく80℃に加熱した2g/lの水溶性高分子化合物を11ml加えた。全ての溶液を混合したものを、200torr(約0.0267MPa)程度の減圧中80℃で30分乾燥させることで、粘土のゲルを得た。このゲルを物体の表面に塗布し、24時間常圧70℃の環境下で乾燥させた。そして、この物体の表面に、実施例1と同様に、機械的な応力を加えると、蛍光の色が変化しなかった。次の式3は、比較例でありその分子構造を示す化学式である。この式3を式1、式2と比べると回転できるフェニル基がない。 A solution of the fluorescent compound was added to the clay aqueous dispersion to obtain a clay dispersion in which the fluorescent compound was adsorbed on the surface. The fluorescent compound was a fluorene compound of the following formula 3, which is a rigid skeleton molecule. This dispersion was heated to 80 ° C., and 11 ml of a 2 g / l water-soluble polymer compound heated to 80 ° C. was added to the dispersion. A mixture of all the solutions was dried in a reduced pressure of about 200 torr (about 0.0267 MPa) at 80 ° C. for 30 minutes to obtain a clay gel. This gel was applied to the surface of an object and dried in an environment of 70 ° C. and normal pressure for 24 hours. Then, when mechanical stress was applied to the surface of this object in the same manner as in Example 1, the fluorescence color did not change. The following formula 3 is a chemical formula showing a molecular structure as a comparative example. When this Formula 3 is compared with Formula 1 and Formula 2, there is no phenyl group which can rotate.
Figure JPOXMLDOC01-appb-C000003
Figure JPOXMLDOC01-appb-C000003
 図7は、比較例の蛍光スペクトルを示すグラフである。図7のグラフの縦軸は、蛍光強度を相対値で表示し、横軸は蛍光の波長を示している。図7の中で、比較例のゲルを塗布したときの蛍光スペクトルを示すグラフは丸(○)で、それに応力を掛けたときの蛍光スペクトルを四角(□)で示している。この2つのグラフはほぼ重なっており、蛍光色にほとんど変化がないことが分かる。 FIG. 7 is a graph showing the fluorescence spectrum of the comparative example. The vertical axis of the graph in FIG. 7 indicates the fluorescence intensity as a relative value, and the horizontal axis indicates the wavelength of the fluorescence. In FIG. 7, the graph showing the fluorescence spectrum when the gel of the comparative example is applied is a circle (◯), and the fluorescence spectrum when stress is applied to the circle is shown by a square (□). These two graphs are almost overlapped, and it can be seen that there is almost no change in the fluorescent color.
 本発明は、構造体の表面に係る圧力(応力)を測定する分野に利用すると良い。例えば、建築物の構造、航空機の機体、自動車の車体、土木機械の機体等の構造体の破壊検査、耐久検査等に利用すると良い。また、ゴルフのヘッド、野球のバット等のように打撃を受ける又は打撃を与えるスポーツ道具に利用すると良い。 The present invention may be used in the field of measuring pressure (stress) on the surface of a structure. For example, it may be used for destructive inspection, durability inspection, and the like of structures such as building structures, aircraft bodies, automobile bodies, and civil engineering machinery bodies. Moreover, it is good to use for the sport equipment which receives a hit | damage or gives a hit like a golf head, a baseball bat, etc.

Claims (11)

  1.  粘土鉱物に由来する化合物の微粒子の層からなる層状化合物と、
     複数の前記層の間に挟まれた1種類以上の蛍光化合物と、
     前記層間に充填されたもので、前記微粒子より大きな分子大きさを有するバインダーと
     からなる圧力感知材料であって、
     外部から加えられた機械的な力によって前記層が変形すると、前記蛍光化合物が蛍光を発する
     ことを特徴とする圧力感知材料。
    A layered compound consisting of a fine particle layer of a compound derived from a clay mineral;
    One or more fluorescent compounds sandwiched between a plurality of the layers;
    A pressure sensing material filled between the layers and comprising a binder having a molecular size larger than that of the fine particles,
    The pressure-sensitive material, wherein the fluorescent compound emits fluorescence when the layer is deformed by a mechanical force applied from outside.
  2.  請求項1に記載の圧力感知材料において、
     前記蛍光化合物は、ビフェニレン構造を有する有機蛍光化合物である
     ことを特徴とする圧力感知材料。
    The pressure sensitive material of claim 1, wherein
    The pressure-sensitive material, wherein the fluorescent compound is an organic fluorescent compound having a biphenylene structure.
  3.  請求項1又は2に記載の圧力感知材料において、
     前記蛍光化合物の粒子の大きさは、前記微粒子より小さい
     ことを特徴とする圧力感知材料。
    The pressure sensitive material according to claim 1 or 2,
    The pressure sensing material, wherein the fluorescent compound has a particle size smaller than that of the fine particle.
  4.  請求項1又は2に記載の圧力感知材料において、
     前記圧力感知材料は、
     着色剤、充填剤、感温剤、感温色素、及び可塑剤の中から選択される1以上の化合物を有する
     ことを特徴とする圧力感知材料。
    The pressure sensitive material according to claim 1 or 2,
    The pressure sensitive material is
    A pressure-sensitive material comprising one or more compounds selected from a colorant, a filler, a temperature-sensitive agent, a temperature-sensitive dye, and a plasticizer.
  5.  請求項1ないし4の中から選択される1項に記載の圧力感知材料を含有する圧力感知塗料。 A pressure-sensitive paint containing the pressure-sensitive material according to claim 1 selected from claims 1 to 4.
  6.  1種類以上の蛍光化合物と、
     粘土鉱物に由来する化合物の微粒子の層からなる層状化合物と、
     前記層間に充填されたもので、前記微粒子より大きな分子大きさを有するバインダーと
     からなる圧力感知材料の製造方法であって、
     前記蛍光化合物の溶液を得る工程と、
     前記微粒子を水分散し粘土水分散液を得る工程と、
     前記工程で得られた前記蛍光化合物の溶液と、前記粘土水分散液と、前記バインダーとを混合して混合液を得る工程と、及び、
     前記混合液を濃縮して前記圧力感知材料を得る工程と
     からなることを特徴とする圧力感知材料の製造方法。
    One or more fluorescent compounds;
    A layered compound consisting of a fine particle layer of a compound derived from a clay mineral;
    A method for producing a pressure sensing material comprising a binder filled between the layers and having a molecular size larger than that of the fine particles,
    Obtaining a solution of the fluorescent compound;
    A step of dispersing the fine particles in water to obtain a clay water dispersion;
    Mixing the solution of the fluorescent compound obtained in the step, the clay aqueous dispersion, and the binder to obtain a mixed solution; and
    And a step of concentrating the liquid mixture to obtain the pressure sensing material.
  7.  請求項6に記載の圧力感知材料の製造方法において、
     前記バインダーは、高分子化合物である
     ことを特徴とする圧力感知材料の製造方法。
    In the manufacturing method of the pressure sensing material according to claim 6,
    The method for producing a pressure sensing material, wherein the binder is a polymer compound.
  8.  請求項6又は7に記載の圧力感知材料の製造方法において、
     前記蛍光化合物は、ビフェニレン構造を有する有機分子である
     ことを特徴とする圧力感知材料の製造方法。
    In the manufacturing method of the pressure sensing material according to claim 6 or 7,
    The method for producing a pressure sensing material, wherein the fluorescent compound is an organic molecule having a biphenylene structure.
  9.  請求項6ないし8の中から選択される1項に記載の圧力感知材料の製造方法において、
     前記蛍光化合物は、サイズが0.5~5nmの棒状形状を有し、
     前記層状化合物の前記微粒子はサイズが20~100nmである
     ことを特徴とする圧力感知材料の製造方法。
    A method for producing a pressure sensitive material according to claim 1 selected from among claims 6 to 8.
    The fluorescent compound has a rod-like shape with a size of 0.5 to 5 nm,
    The method for producing a pressure-sensitive material, wherein the fine particles of the layered compound have a size of 20 to 100 nm.
  10.  請求項9に記載の圧力感知材料の製造方法において、
     前記圧力感知材料はゲル状物であり、構造体の表面に塗布して使用される
     ことを特徴とする圧力感知材料の製造方法。
    In the manufacturing method of the pressure sensing material according to claim 9,
    The method for producing a pressure sensing material, wherein the pressure sensing material is a gel-like material and applied to the surface of a structure.
  11.  請求項6又は7に記載の圧力感知材料の製造方法において、
     前記蛍光化合物の溶液、前記粘土水分散液及び前記バインダーを混合する前に、加熱する工程を有する
     ことを特徴とする圧力感知材料の製造方法。
    In the manufacturing method of the pressure sensing material according to claim 6 or 7,
    A method for producing a pressure-sensitive material, comprising the step of heating before mixing the solution of the fluorescent compound, the clay aqueous dispersion, and the binder.
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