JP4832846B2 - Thermal management indicator - Google Patents

Description

  The present invention relates to a mercury-free temperature management indicator that displays a specific temperature range by a reversible color change and displays whether a specific temperature has been reached by an irreversible color change.

  For temperature control of machinery, equipment, and constant temperature storage products, temperature indicators that change color reversibly according to temperature using a temperature indicating material are widely used.

  A halogen-containing mercury complex compound has been used as such a temperature indicating material, but it has been avoided from the viewpoint of human safety measures against mercury and environmental protection measures.

  As a temperature indicator that reversibly discolors without containing mercury, for example, Patent Document 1 discloses a temperature-indicating material comprising, as components, an electron-donating color-forming organic compound, a compound having a phenolic hydroxyl group, and a compound having an alcoholic hydroxyl group. Are listed. In Patent Documents 2 to 3, an electron-donating color-forming organic compound or an electron-accepting organic compound is encapsulated in a microcapsule, and an ultraviolet absorber is contained or a light-shielding pigment-containing layer is laminated to provide light resistance. An indicator with improved performance is described. In general, however, organic compounds are easily decomposed by light over time. Therefore, indicators that use organic compound temperature indicating materials or microcapsules that contain them are covered with light-shielding pigment-containing layers. In particular, the light resistance is insufficient.

  In addition, the reversible temperature indicator can be used repeatedly, but it can only check the temperature at the time of visual observation and cannot display the temperature history over time.

Japanese Patent Publication No. 51-44706 Japanese Patent Laid-Open No. 5-32045 JP 2003-118044

  The present invention has been made to solve the above-mentioned problems, has a simple structure, does not contain mercury, which is a harmful metal, is safe, has excellent durability, particularly light resistance, and has a specific temperature range. It is an object of the present invention to provide a temperature management indicator that can display by reversible color change and can display by irreversible color change whether a specific temperature has been reached.

The temperature management indicator of claim 1 made to achieve the above object is a temperature management indicator having a reversible temperature indicator and an irreversible temperature indicator,
An anti-fading agent comprising any phosphite ester selected from triphenyl phosphite, diphenyl phosphite, diphenyl cresyl phosphite, tricresyl phosphite, and tri-n-dodecyl phosphite; and an electron-accepting compound is an organic dye, a phenolic hydroxyl group-containing electron donor compound which develops color by donating reversibly electrons to said compound, and a heat-fusible color temperature adjusting agent, gelatin, casein, Heat-melt into microcapsules prepared with at least one raw material selected from albumin, gum arabic, agar, sodium alginate, cellulose derivative, polyethylene sulfonic acid, copolymer of vinyl compound and phthalic anhydride, and polyurea. the reversible temperature indicating material mercury-free containing while encapsulated, and solid melting at be measured temperature And a heat fusible substance absorbent substrates exposed by irreversibly absorb it in hot molten state are denoted by the fusible substance, a solid colored thermally fusible substance melting at be measured temperature An opaque or translucent hot-melt material penetrating material that changes color by irreversibly permeating it in a hot-melt state, and a temperature-sensitive color change that reacts and changes color irreversibly at the temperature to be measured the irreversible temperature indicating material mercury-free consisting of either the layer containing the sex material,
It is attached side by side on the indicator board, or a part of it ,
The reversible temperature indicating material is polyimide film, polyester film, polypropylene film, polyethylene film, polystyrene film, polyethylene terephthalate film, polycarbonate film, polystyrene film, cellulose triacetate film, polyvinyl alcohol film, polypropylene film, polyvinyl chloride film, cellophane film. It is characterized by being coated with at least one polymer film selected from nylon film, polymethyl methacrylate film, polyolefin film, and polyvinyl acetate film .

Temperature control this indicator, the phosphorous acid esters, triphenyl phosphite, diphenyl phosphite, diphenyl phosphite, cresyl phosphite, tricresyl it, or phosphite, tri -n- dodecyl It is characterized by.

The temperature management indicator according to claim 2 , wherein the electron-accepting compound is 1 part by weight, the electron-donating compound is 0.1 to 5 parts by weight, the heat-meltable color temperature adjusting agent is 10 to 100 parts by weight, anti-fading agent and wherein to Rukoto and 0.1 to 10 parts by weight.

  Of the polymer films, the polyimide film is known to be excellent as a heat resistant film, but is particularly excellent as a light resistant film. This polyimide film works to improve light resistance and stabilize for a long period of time with respect to electron accepting compounds, electron donating compounds, heat-melting color temperature adjusting agents and microcapsules enclosing them. . Other polymer films, such as polyester films, are excellent in light resistance and slightly inferior to polyimide films, but are good looking and beautiful, so they are used particularly for indoor temperature management indicators.

  This temperature control indicator does not require the use of large and expensive temperature measuring machinery and mercury thermometers, and it is easy to combine the temperature at the time of viewing and the temperature history over time by a clear color change. And display accurately. Furthermore, since it does not contain mercury, it is safe for the human body and the environment, and is durable and particularly light-resistant, so it has a long shelf life. Moreover, since it is a small and simple structure, it is easy to manufacture and inexpensive.

  Examples of the present invention will be described in detail below, but the scope of the present invention is not limited to these examples.

  The temperature management indicator 1 will be described with reference to FIG. 1 corresponding to the embodiment. The temperature management indicator 1 is manufactured as follows.

  First, 1 part by weight of an electron-accepting compound, 0.1 to 5 parts by weight of an electron-donating compound, 10 to 100 parts by weight of a heat-meltable color temperature adjusting agent, 0.1 to 10 parts by weight of an anti-fading agent as an additive, And the solvent are mixed and heated to melt to prepare a uniform mixture. A microcapsule 20 is prepared from this mixture and the raw material of the microcapsule. The microcapsule 20, the binder, and the solvent are kneaded to prepare a reversible temperature indicating ink. By applying this ink to the surface side of the indicator substrate 12 by printing, the reversible temperature indicating material 13 composed of the ink layer is formed.

  Next, the heat-meltable substance 21, the binder, and the solvent are kneaded to prepare an irreversible temperature indicating ink. This ink is applied to the surface side of the absorbent base material 15 to form an irreversible temperature indicating material 17 composed of the ink layer 16 and the absorbent base material 15. The back side of the absorbent base material 15 is attached to a part of the reversible temperature indicating material 13 on the indicator substrate 12 via the adhesive 14.

  Finally, when the exposed reversible temperature indicating material 13 and the irreversible temperature indicating material 17 are covered with the polyimide film 18 (1), the temperature management indicator 1 is obtained.

  The temperature management indicator 1 is installed in an environment where the temperature is to be confirmed, or is attached to a test object.

  The mechanism by which the reversible temperature indicating material 13 is colored is as follows. When the temperature rises above the melting point of the heat-meltable color temperature adjusting agent from the initial low temperature, it melts, and at the same time, in the microcapsule 20, the electron-donating compound comes into contact with the electron-accepting compound and reversibly forms an electron. The color tone of the reversible temperature indicating material changes as a result of causing coloration by changing the electron density. When the temperature returns to a low temperature again, the heat-meltable color temperature adjusting agent solidifies, and at the same time, the electron-donating compound is pulled away from the electron-accepting compound, reversibly returns to the original electron density and returns to the color before coloring. As a result, the reversible temperature indicating material 13 becomes the original color tone.

  On the other hand, the mechanism by which the irreversible temperature indicating material 17 is colored is as follows. At the initial low temperature, the heat-meltable substance 21 that is in a solid state, for example, powder or granules, diffusely reflects or obstructs light transmission, so that the reversible temperature indicating ink layer 16 conceals the absorbent substrate 15. Yes. When the temperature rises from a low temperature to a predetermined temperature, the heat-meltable substance 21 melts and is irreversibly absorbed by the absorbent base material 15. As a result, the absorbent base material 15 is exposed and can be visually observed. This is observed as a change in the color tone of the sexual thermostat 17. Thereafter, even if the temperature decreases and the hot-melt material 21 solidifies, the irreversible temperature indicating material 17 does not return to the original color tone.

  The irreversible temperature indicating material 17 can be stored as a temperature history record because it does not fade with the color tone changed.

  The temperature management indicator 1 may be provided with an adhesive layer 11 with a release paper 10 on the back side of the indicator substrate 12.

  As shown in FIG. 2, characters and designs indicating that a temperature history that has reached a desired temperature has been printed on the absorbent base material of the irreversible temperature indicating material 17 attached on the reversible temperature indicating material 13. May be. When the irreversible temperature indicating material 17 is at a low temperature, the letters of the absorbent base material are concealed by the hot-melt material 21 as shown in FIG. When the character of the absorptive base material which shows that is displayed irreversibly, it discolors.

  As shown in FIG. 3, an irreversible temperature indicating material 17 may be attached to the reversible temperature indicating materials 13 (1) and 13 (2) using heat melting temperature adjusting agents having different melting points. The plurality of reversible temperature indicating materials color reversibly separately at different temperatures.

  As shown in FIG. 4, irreversible temperature indicating materials 17 (1), 17 (2), and 17 (3) using heat-meltable substances having different melting points may be attached to the reversible temperature indicating materials. The plurality of irreversible temperature indicating materials color irreversibly separately at different temperatures.

  As shown in FIG. 5, it may be covered with the polyimide film 18 (2) without having an irreversible temperature indicating material.

  In addition, the reversible temperature indicating ink is applied to the indicator substrate to form a reversible temperature indicating material, and the reverse side of the absorbent base material having the ink layer for the irreversible temperature indicating material is pasted at another position on the substrate. It may be a temperature indicating material. A reversible temperature indicating ink may be applied to an irreversible temperature indicating ink layer on an absorbent base material that also serves as an indicator substrate. The absorptive base material may be a resin layer containing an ink vehicle that diffuses while absorbing a melted hot-melt material. The heat-fusible substance is colored in powder or granular form and is kneaded or imprinted on the porous base material, and melts and diffuses into the absorbent base material to exhibit color. Also good.

  An irreversible temperature indicating material is an opaque or translucent heat-resistant layer coated with an irreversible temperature indicating ink containing a solid colored heat-meltable material that melts at the temperature to be measured. It may be a structure covered with a meltable material permeation material and concealed. The temperature management indicator having this structure is irreversibly discolored by absorbing the material in the hot-melt state into the hot-melt material penetrating material, diffusing it and coloring it.

  In addition, the irreversible temperature indicating material is an irreversible temperature indicating ink containing a temperature-sensitive color-changing substance that changes color by causing a reaction such as a decomposition reaction irreversibly at the temperature to be measured. There may be. The temperature management indicator of this structure is irreversibly discolored due to a chemical change.

  The polymer film is, for example, polyimide, polyester, polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polycarbonate, polystyrene, cellulose triacetate, polyvinyl alcohol, polypropylene, polyvinyl chloride, cellophane, nylon, polymethyl (meth) acrylate, polyolefin, or polyacetic acid. It is formed into a film with vinyl. The polymer film may be formed alone or in combination, or may be formed by copolymerization. Moreover, the ultraviolet cut process which contains an ultraviolet absorber or coats an ultraviolet-ray shielding layer may be performed. The polymer film preferably has a thickness of 5 to 200 μm.

  Among them, the polyimide film expresses light resistance and prevents excessive electron transfer reaction between the electron accepting compound and the electron donating compound due to light, particularly ultraviolet rays. Kapton (manufactured by Toray DuPont Co., Ltd .: Product name).

  Specifically, the constituent materials of the reversible temperature indicating material are as follows.

  The electron-donating compound is an organic dye that colors reversibly by donating electrons to the electron-accepting compound in accordance with oxidation and reduction. For example, triphenylmethane phthalides, fluorans, spiropyrans, phenothiazines, indole phthalides, leucooramines, rhodamine lactams, diaryl phthalides, polyaryl carbinols, acyl auramines, aryl aura Examples include leuco dyes such as mines. Among them, crystal violet lactone and malachite green lactone as triphenylmethane phthalides; benzoylleucomethylene blue as phenothiazines; 2-diethylaminobenzofluorane, 2-cyclohexylaminofluorane, 3,6-diethoxyfluorane as fluorans; 2- (Phenyliminoethanedilidene) -3,3-dimethylindoline, 1,3,3-trimethylindolino-7'-chloro-β-naphthospiropyran as indolephthalides; N-acetyl as leucooramines Auramine, N-phenylauramine; Rhodamine β-lactam is preferred as the rhodamine lactams.

  An electron-accepting compound is an electron-donating compound that is donated with an electron. For example, a phenolic hydroxyl group-containing compound, more specifically, an alkyl group, an alkoxy group, a hydroxy group, an aryl group, an acyl group, an alkoxycarbonyl group. Groups, cyano groups, monophenols optionally substituted with a halogen atom, polyphenols, and hydroxycoumarins. Among them, as 4-hydroxycoumarins, 4-hydroxycoumarin, 3-benzoyl-4-hydroxycoumarin, 3-cyano-4-hydroxycoumarin, 3-methoxy-4-hydroxycoumarin, 3-ethoxy-4-hydroxycoumarin, Dicoumarol is preferred.

  A heat-meltable color temperature adjusting agent controls the electron transfer reaction between an electron-donating compound and an electron-accepting compound as it melts or solidifies at a predetermined melting point, and reversibly colors or discolors. It is. Coloring and decoloring occur near the melting point. Examples of the heat-meltable color temperature adjusting agent include fatty acid higher alcohols, fatty acids, acid amides, esters, and ethers. Among these, higher aliphatic alcohols having excellent compatibility between the electron-donating compound and the electron-accepting compound, such as n-octyl alcohol, n-nonyl alcohol, n-decyl alcohol, n-lauryl alcohol, n-myristyl alcohol, n- Cetyl alcohol, n-stearyl alcohol, n-eicosyl alcohol and n-docosyl alcohol are preferred.

  An anti-fading agent, which is a kind of additive, prevents the color density from fading gradually over time. Phosphorous esters, specifically triphenyl phosphite, phosphorous acid Examples include diphenyl, diphenyl cresyl phosphite, tricresyl phosphite, and tri-n-dodecyl phosphite.

  The raw materials for microcapsules are proteins such as gelatin, casein, and albumin; carbohydrates such as gum arabic, agar, sodium alginate, and cellulose derivatives; polyethylenesulfonic acid, copolymers of vinyl compounds and phthalic anhydride, and polyurea Examples of such polymers. The microcapsules may have a particle size of 1 to several by a known method such as a coacervation method, an interfacial polymerization method, an in situ polymerization method, a phase separation method, a melt dispersion cooling method, an air suspension coating method, or a spray drying method. 100 μm.

  Examples of the binder used in the reversible temperature indicating ink include butyl rubber, methyl cellulose, ethyl cellulose, vinyl acetate, vinyl chloride, hydroxymethyl cellulose, carboxymethyl cellulose, acrylic resin, phenol resin, nylon, and polyvinyl alcohol. The ink vehicle may be, for example, a commercially available PAS 800 medium (manufactured by Jujo Chemical Co., Ltd .: trade name) or high set matte medium (manufactured by Mino Group: trade name).

  Solvents used in the reversible temperature ink are, for example, water, methanol, ethanol, butanol, ethyl acetate, isoamyl acetate, methyl ethyl ketone, methyl isobutyl ketone, xylene, diethylbenzene, toluene, butyl cellosolve, ethyl cellosolve, cyclohexanone, isopropyl alcohol, cellosolve acetate, A mineral spirit is mentioned.

  Specifically, the constituent materials of the irreversible temperature indicating material are as follows.

  Examples of the heat-meltable substance include fatty acid derivatives, alcohol derivatives, ether derivatives, aldehyde derivatives, ketone derivatives, amine derivatives, amide derivatives, nitrile derivatives, hydrocarbon derivatives, thiol derivatives, and sulfide derivatives. These may be used alone or in combination.

  Fatty acid derivatives as heat-melting substances include myristic acid, palmitic acid, adipic acid, octanoic acid, tricosanoic acid, tetratriacontanoic acid, 2,3-dimethylnonanoic acid, 23-methyltetracosanoic acid, 2-hexenoic acid, and brassine. Acid, 2-methyl-2-dodecenoic acid, β-eleostearic acid, behenolic acid, cis-9,10-methyleneoctadecanoic acid, sorghumulinic acid, 3,3′-thiodipropionic acid-n-dodecyl, Trilaurine, palmitic acid anilide, stearic acid amide, zinc stearate, salicylic acid anilide, N-acetyl-L-glutamic acid, caproic acid-β-naphthylamide, enanthic acid phenylhydrazide, arachidic acid-p-chlorophenacyl, cholesteryl formate, 1- Aceto-2,3-distearic acid, thiolauric acid -N-pentadecyl, stearic acid chloride, palmitic anhydride, stearic acid-acetic anhydride, succinic acid, benzylammonium sebacate, 2-bromovaleric acid, alpha-sulfostearic acid methyl sodium salt, 2-fluoroarachin Examples include acids.

  Similarly, alcohol derivatives include octadecyl alcohol, cholesterol, D-mannitol, galactitol, heptatriacontanol, hexadecan-2-ol, 1-trans-2-octadecenol, β-eleostearyl alcohol, cycloeicosanol, Examples include d (+) cellobiose, p, p′-biphenol, riboflavin, 4-chloro-2-methylphenol, and 2-bromo-1-indanol.

  Similarly, ether derivatives include dihexadecyl ether, dioctadecyl ether, cytidine, adenosine, sodium phenoxyacetate, 1,3-bis (4-hydroxyphenoxy) benzene, and aluminum triethoxide.

  Similarly, examples of the aldehyde derivative include stearaldehyde, paralauryl aldehyde, para stearaldehyde, naphthaldehyde, p-chlorobenzaldehyde, phthalaldehyde, and 4-nitrobenzaldehyde.

  Similarly, ketone derivatives include stearone, docosan-2-one, phenylheptadecyl ketone, cyclononadecane, vinyl heptadecyl ketone, 4,4-bisdimethylaminobenzophenone, bis (2,4-pentanedionite) calcium, 1-chloroanthraquinone. Is mentioned.

  Similarly, amine derivatives include tricosylamine, dioctadecylamine, N, N-dimethyloctylamine, heptadecamethyleneimine, naphthylamine, ethyl p-aminobenzoate, o-trithiourea, sulfamethazine, guanidine nitrate, p-chloroaniline, propyl. Amine hydrochloride is mentioned.

  Similarly, amide derivatives include hexylamide, octacosylamide, N-methyldodecylamide, N-methylheptacosylamide, α-cyanoacetamide, salicylamide, dicyandiamide, 2-nitrobenzamide, and N-bromoacetamide.

  Similarly, examples of the nitrile derivative include pentadecane nitrile, margaronitrile, 2-naphthonitrile, o-nitrophenoxyacetic acid, 3-bromobenzonitrile, 3-cyanopyridine, and 4-cyanophenol.

  Similarly, hydrocarbon derivatives include hexadecane, 1-nonatriacontene, trans-n-2-octadecene, hexatriacontylbenzene, 2-methylnaphthalene, bicene, cyanuric chloride, 1-fluorononadecane, 1-chloroeicosane, Examples include 1-iodopentadecane, 1-bromoheptadecane, 1,2,4,5-tetrakis (bromomethyl) benzene.

  Similarly, examples of the thiol derivative include pentadecane thiol, eicosane thiol, 2-naphthalene thiol, 2-mercaptoethyl ether, and 2-nitrobenzenesulfenyl chloride.

  Similarly, sulfide derivatives include 1,3-diatine, 2,11-dithia [3,3] paracyclophane, bis (4-hydroxy-3-methylphenyl) sulfide, 4,4-dipyridyl sulfide, 4-methylmercaptophenol. Is mentioned.

  The binder and the solvent of the irreversible temperature indicating ink are the same as those for the reversible temperature indicating ink.

  The thermochromic substance may be a thermochromic compound, a thermochromic mixture in which an organic dye and an organic acid are mixed and reacted at a predetermined temperature to change color, or thermal paper.

  Examples of the thermochromic compound include cobalt-hexamethylenetetramine salt, nickel-hexamethylenetetramine salt, cobalt phosphate · octahydrate, cobalt oxalate · potassium · trihydrate, and copper hydroxide.

  In the temperature-sensitive color-changing mixture of an organic dye and an organic acid, examples of the organic dye include those similar to the organic dye of the electron-donating compound, and examples of the organic acid include phthalic acid, adipic acid, and sebacic acid.

  Examples of the absorbent substrate include paper such as filter paper, nonwoven fabric, and fabric.

  The indicator substrate is the same as the absorbent substrate, cellulose, cellulose derivatives, polyolefin, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyester, polystyrene, hydrochloric acid rubber, polyamide, fluororesin, polybutene, polyvinyl butyral, polyethylene Examples of the resin sheet include oxide, polyurethane, cellulose acetate butyrate, hydroxyethyl cellulose, and polyimide.

  Hereinafter, an example in which a temperature management indicator is prototyped will be described in Example 1.

Example 1
1 g of crystal violet lactone as an electron-accepting compound, 1 g of 4-hydroxycoumarin as an electron-donating compound, 50 g of myristyl alcohol as a heat-meltable color temperature adjusting agent, and 1 g of triphenyl phosphite as a discoloration inhibitor are mixed, And melted to prepare a uniform mixture. This mixture was mixed with Epicoat 828 (manufactured by Yuka Shell Epoxy Co., Ltd .: trade name), and dispersed and stirred in 1000 ml of a 1.5% aqueous sodium alginate solution heated to 80 ° C. To the solution, 10 g of EpiCure U (manufactured by Yuka Shell Epoxy Co., Ltd .: trade name) was added to obtain microcapsules. A reversible temperature indicating ink was prepared by kneading 60 g of microcapsules and 150 g of binder for ink vehicle gold and silver (trade name, manufactured by Minoburu Co., Ltd.) as a binder. This ink was applied to a polyester film with a pressure-sensitive adhesive on the back side, the solvent was dried, and a reversible temperature indicating material consisting of the ink layer 15 mm long and 30 mm wide was formed. 100 g of palmitic acid having a melting point of about 60 ° C. as a hot-melt material, 10 g of ethyl cellulose as a binder, and 160 g of toluene as a solvent were kneaded to prepare an irreversible temperature indicating ink. This ink was printed on the surface side of the printing paper on which the characters “60” were printed in advance 6 mm in length and 12 mm in width, and an irreversible temperature indicating material having the ink layer was formed. The back side surface was affixed to a part of the reversible temperature indicating material via an adhesive. When a reversible temperature indicator and an irreversible temperature indicator were covered with a polyimide film via an adhesive, a temperature control indicator was obtained.

  This reversible temperature indicating material showed a blue color at 35 ° C. or lower, but was colorless when the temperature exceeded 35 ° C. In this irreversible temperature indicating material, palmitic acid was melted and absorbed by the paper at about 60 ° C. or higher, and the letter “60” printed thereon was lifted and observed.

  The temperature management indicator of the present invention is used for temperature management of machinery and equipment, prevention of overheating accidents of power distribution equipment, and confirmation of temperature history of constant temperature storage products.

It is sectional drawing of the temperature management indicator to which this invention is applied.

It is a top view which shows the middle of use of the temperature management indicator to which this invention is applied.

It is a top view which shows the middle of use of another temperature management indicator to which this invention is applied.

It is a top view which shows the middle of use of another temperature management indicator to which this invention is applied.

It is sectional drawing of another temperature management indicator to which this invention is applied.

Explanation of symbols

  1 is a temperature control indicator, 10 is a release paper, 11 is an adhesive layer, 12 is an indicator substrate, 13 · 13 (1) · 13 (2) is a reversible temperature indicating material, 14 is an adhesive layer, 15 is an absorbent substrate, 16 is an ink layer, 17 · 17 (1) · 17 (2) · 17 (3) are irreversible temperature indicating materials, 18 (1) is a polymer film such as a polyimide film, 18 (2) is a polyimide film, and 20 is A microcapsule 21 is a hot-melt material.

Claims (2)

A temperature management indicator having a reversible temperature indicator and an irreversible temperature indicator,
An organic dye and an anti-fading agent comprising a phosphite ester selected from triphenyl phosphite, diphenyl phosphite, diphenyl cresyl phosphite, tricresyl phosphite, and tri-n-dodecyl phosphite; and there electron-accepting compound, and a phenolic hydroxyl group-containing electron donor compound which develops color by donating reversibly electrons to said compound, and a heat-fusible color temperature adjusting agent, gelatin, casein, albumin, gum While being heated and melted in a microcapsule prepared from at least one raw material selected from rubber, agar, sodium alginate, cellulose derivative, polyethylene sulfonic acid, a copolymer of vinyl compound and phthalic anhydride, and polyurea the reversible temperature indicating material mercury-free containing, and solid thermofusible which melts at a temperature to be measured Covering a heat fusible substance absorbent substrates exposed by irreversibly absorb it in hot molten state are denoted by the quality, the solid colored thermally fusible substance melting at be measured temperature An opaque or translucent hot-melt material penetrating material that changes color by irreversibly permeating it in a hot-melt state and a thermosensitive color-changing material that reacts and changes color irreversibly at the temperature to be measured the irreversible temperature indicating material mercury-free consisting of either the layer containing the found
It is attached side by side on the indicator board, or a part of it ,
The reversible temperature indicating material is polyimide film, polyester film, polypropylene film, polyethylene film, polystyrene film, polyethylene terephthalate film, polycarbonate film, polystyrene film, cellulose triacetate film, polyvinyl alcohol film, polypropylene film, polyvinyl chloride film, cellophane film. A temperature management indicator which is coated with at least one polymer film selected from nylon film, polymethyl methacrylate film, polyolefin film and polyvinyl acetate film . 1 part by weight of the electron-accepting compound, 0.1 to 5 parts by weight of the electron-donating compound, 10 to 100 parts by weight of the heat-meltable color temperature adjusting agent, and 0.1 to 10 of the anti-fading agent temperature control indicator according to claim 1, wherein the parts by weight to Rukoto.

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