JPH0777463A - Thermo-sensitive label - Google Patents

Abstract

PURPOSE:To provide a thermo-sensitive label capable of simply and surely reporting at an early stage the temperature information of apparatuses installed at a narrow position hardly accessible to hands or eyes and capable of freely selecting temperature. CONSTITUTION:A micro-capsule layer 2 containing an aromatic is provided on a sheet base material 5, and the upper section of the micro-capsule layer 2 is covered with an aroma dissipation suppressing mesh sheet 1 impregnated with a heat fusion composition 3. The heat fusion composition 3 impregnated in the aromatic dissipation suppressing mesh sheet 1 is melted at a set temperature or above, gaps are generated in the aroma dissipation suppressing mesh sheet 1, and the aromatic is continuously dissipated for a long period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive label for temperature control, which notifies the overheated state of, for example, a generator or an electric motor with a scent.

[0002]

2. Description of the Related Art Electric parts such as generators and electric motors sometimes overheat as a precursor of a slight failure. As a convenient and highly practical temperature control method for detecting a temperature abnormality due to overheating, a temperature indicating material whose hue changes with temperature has been used. When the temperature indicating material is attached to the electric component, the hue of the temperature indicating material changes due to the change in the heat generation state of the electric component. By visually confirming the hue change, the heat generation state of the electric component can be detected. This method is suitable for tests and experiments that the human eye can reach at any time, or for temperature control of familiar parts, but it cannot be applied to a system that controls the overall temperature in a wide space such as a factory.

JP-A-53-133697, JP-A-64-75284
Japanese Patent Laid-Open No. 2-214698 discloses a material that transmits a temperature state to the sense of smell. The high heat of a cigarette fire or a heated thermal head destroys the shell of the perfume-containing microcapsule, generating an aroma.

A material having a property of emitting a certain aroma at a certain temperature is considered to be applied to a device or the like that warns of an overheated state. When applied to an overheat alarm, the material must continue to emit a warning signal at least to some extent until the observer notices the warning signal. The conventional heat-sensitive microcapsules emit the fragrance immediately when the shell is broken, have almost no fragrance persistence, and can hardly withstand actual use as an overheat warning device for temperature control.

The shell of the microcapsule is destroyed at a considerably high temperature range. There are few microcapsules that can freely select the required heat-sensitive temperature from a wide range. Considering safety, it is very difficult to form microcapsules for temperature control that can notify abnormal temperature relatively early in a state where the temperature does not rise sufficiently, for example, in the range from room temperature to about 200 ° C. There was a problem.

Japanese Unexamined Patent Publication (Kokai) No. 5-18831 discloses a temperature monitoring gas emitting body for detecting abnormal overheating.
The gas permeability is increased by the destruction of the microcapsules or the expansion of the microcapsules due to heating, and the low boiling point compound contained in the microcapsules is released. Therefore, a device for detecting the released gas is required.

[0007]

A temperature monitoring method for a generator, an electric motor, etc. using a temperature sensor, a gas detector, etc., requires a large number of facilities and wirings when there are a large number of monitoring points. Also, the monitoring method using a temperature indicator or a rod-shaped thermometer is easy to overlook, requires a long time for inspection, and is difficult to perform in a narrow space.

In order to solve the above-mentioned problems, the present invention can easily and surely inform the temperature information of the equipment installed in a narrow place where the human hand and eyes cannot reach easily, and the temperature can be selected. The purpose is to provide a free heat sensitive label.

[0009]

A heat-sensitive label of the present invention made to achieve the above object will be described with reference to FIG. 1 corresponding to an embodiment.

In the heat-sensitive label 8 of the present invention, the microcapsule layer 2 is provided with the perfume-containing microcapsule layer 2 on the sheet base material 5 and is impregnated with the heat-fusible composition 3 in the perfume emission-suppressing mesh sheet 1. 2 is covered.

The microcapsule layer 2 is a layer in which the fragrance is microencapsulated and the microcapsules are stacked in layers.

The fragrance contained in the microcapsules releases a fragrance and is insoluble in water. The fragrance may be a natural fragrance or a synthetic fragrance. As the natural flavor, both animal flavor and plant flavor can be used, and synthetic flavors include, for example, terpene hydrocarbons, terpene alcohols, other alcohols, phenol and its derivatives, aliphatic aldehydes,
Terpene aldehydes, aromatic aldehydes, acetals, aliphatic ketones, terpene ketones, aromatic ketones,
Alicyclic ketone, alicyclic ether, alicyclic lactone, macrocyclic ketone, macrocyclic lactone, synthetic musk, cyclic ether, heterocyclic compound, ester of aliphatic acid, ester of aromatic acid, so-called aldehydes is there. All of these are processed into an oily compound to obtain a hydrophobic solution. It can be used alone or in combination of two or more. Further, it is possible to make temperature series by changing the type of odor according to the set temperature. Since most of the fragrances are processed into oily compounds, it is difficult to use them for labels as they are, and it is desirable to encapsulate them in microcapsules and pulverize them.

The particle size of the microcapsule layer 2 is 10 μm.
Is about 500 μm. Preferably 50 μm to 200 μm
Is desirable. When the particle size of the microcapsule layer 2 is smaller than 10 μm, the amount of fragrance per unit microcapsule decreases. As a result, the aroma emitted is reduced and the odor is no longer felt strongly. Particle size is 500μm
If it exceeds the range, the strength of the microcapsule is lowered and the microcapsule may be broken during the manufacturing process of the heat-sensitive label 8.

The microcapsules are manufactured by various known methods. The production method of the microcapsule that can be used in the present invention is, for example, an interfacial polymerization method, an in situ polymerization method, a liquid hardening coating method, a phase separation method, a liquid drying method, a melt dispersion cooling method, an inclusion exchange method, a powder bed method, Air suspension coating method, inorganic wall capsule, vacuum vapor deposition coating method, electrostatic coalescence method, spray drying method. However, an interfacial polymerization method is more preferable because a capsule having a porous surface can be obtained. If the surface is porous, the perfume will release the aroma while being encapsulated.

Examples of the sheet base material 5 include synthetic resin films such as polyester resin, polycarbonate resin and polypropylene resin, and metal foils such as iron, aluminum and stainless steel.

The hot-melt composition 3 is a hydrophobic solid and preferably has a melting point of about room temperature to 200 ° C. Examples thereof include fatty acids and fatty acid derivatives, alcohols, glycols, ethers and their derivatives, nitrogen-containing compounds, other hydrocarbons and sulfur-containing compounds.

The fatty acid is, for example, a linear saturated acid, a branched saturated acid, a linear monoenoic acid, a branched monoenoic acid, a dienoic acid, a trienoic acid, a tetraenoic acid, an acetylenic acid or a cyclic acid.

Fatty acid derivatives include fatty acid esters and fatty acid anhydrides. Fatty acid esters include, for example, methyl and ethyl esters of fatty acids, monohydric alcohol esters, cholesteric esters, acrylic acid, methacrylic acid esters, vinyl and methacrylic esters of fatty acids, cyclohexanolphenol and α-furfuryl alcohol esters, α, ω- Diol ester, fatty acid ester of polyol, monoglyceride, diglyceride,
Triglyceride, thiol ester of fatty acid. The fatty acid ester may be formed with a dibasic acid fatty acid. In this case, the fatty acid and its fatty acid ester include, for example, saturated dibasic acid and its derivative, monoester, diester, monoethyl ester, dibasic acid diester, allyl ester and propenyl ester. The fatty acid ester may be formed of a fatty acid having a substituent on the carbon chain. In this case, the fatty acid and its fatty acid ester,
For example, 2-oxy saturated acid and its ester, 2-bromo saturated acid, ω-bromo saturated acid, 2-bromo saturated acid and ω-bromo saturated acid ester, oxystearic acid and its ester, 3-oxy saturated acid, ω-oxy saturated acid, DL- 2-methyl-2-oxy saturated acid, oxyalkenoic acid, ricinoleic acid ester, 12-silricinoleic acid alkynyl ester, methyl-substituted oxy acid, 3,3-dialkyl-3-oxypropionic acid, 2,3-dioxy saturated acid, natural polyoxy saturated acid, nitrilo and Treo 9,10-dioxystearic acid ester, nitrilo and threodioxystearic acid, ω-chloro saturated acid, 2-keto saturated acid, other keto saturated acid, long chain keto acid, 3-keto saturated acid, keto stearic acid and its ester 4-keto 2 Lucene acid, 2,4-diketo saturated acid and its ester, α-sulfone stearic acid sodium salt, 2-cyano-3,3-dialkyl acid ester, 2-cyano-α, β-unsaturated-3-alkyl acid ester, 2-fluoro acid ester, Epithio saturated fatty acid,
Dialkyl malonic acid diethyl ester, α-alkyl substituted carboxylic acid, monoketodicarboxylic acid and diethyl ester, unsaturated dibasic acid, ω-alkylthio and ω-alkylsulfonylcarboxylic acid, stearic acid polysubstitution and its ester, mixed substituents There are stearic acid and its esters. Examples of the fatty acid anhydride include undecanoic anhydride, lauric anhydride, palmitic anhydride, stearic anhydride, phthalic anhydride, succinic anhydride, and maleic anhydride.

Alcohols, glycols and ethers include, for example, alkanol-1, alkanol-2, β,
γ-Unsaturated primary alcohols, terminal unsaturated alcohols, other unsaturated long-chain alcohols and various esters, cyclic alcohols, α, ω-glycols, 1,2-diols, cyclic glycols, polyhydric alcohols, substituted glycerin, di-n-alkynyl Ether, long-chain vinyl ether.

Alcohol derivatives such as aldehydes, ketones, acyloins, and ketene include, for example, aldehyde monomers, trimers, saturated aldehyde derivatives, α,
β-aldehyde derivatives, α, β-unsaturated aldehydes and derivatives, dialdehydes, dialkyl ketones, methyl alkyl ketones, phenyl alkyl ketones, macrocyclic ketones, α, β-unsaturated ketones, cyclic unsaturated ketones, α-diketones, long chains There are asiloin, cyclic asiloin, and moss.

The nitrogen-containing compounds include amines, amides,
There are nitriles, for example, primary amine, secondary amine, tertiary amine, other aliphatic secondary, aliphatic tertiary amine, aliphatic amide, N-methyl aliphatic amide, carbamic acid ester, and aliphatic nitrile.

Other hydrocarbons include, for example, n-alkane, n-alkene-1, n-alkylbenzene, and n-alkylnaphthalene. These hydrocarbons may be halogenated hydrocarbons and include 1-fluoroalkane, 1-chloroalkane, 1-bromoalkane and 1-iodoalkane.

The sulfur-containing compound is thiol or sulfide, for example, n-alkanethiol-1. These hot-melt compositions 3 are used alone or as a mixture of two or more kinds.

The perfume emission suppressing mesh sheet 1 is obtained by impregnating the mesh sheet with the hot-melt composition 3.

The mesh sheet is a polymer such as nylon, polyurethane, polyester, polyethylene, polyvinyl chloride, or polycarbonate, or stainless steel,
It is made of a metal such as iron or copper, has a mesh shape, and can be impregnated with the hot-melt composition 3. The mesh sheet has an opening of 100 μm to 2000 μm, preferably 30.
It is preferably 0 to 1000 μm. 10 openings
This is because if it is smaller than 0 μm, when the heat-meltable composition 3 is melted, a sufficient gap for releasing the aroma cannot be obtained. When it exceeds 2000 μm, it becomes difficult for the heat-meltable composition 3 to completely cover the gaps of the mesh sheet. When the heat-meltable composition 3 impregnated in the mesh sheet is melted, it does not stay at the upper part of the microcapsule layer 2 and quickly forms a gap in the mesh sheet.
In addition, the once created gap remains after the temperature has dropped, allowing irreversible aroma release.

[0026]

If the heat-sensitive label 8 is attached to a device which may be overheated, the heat-meltable composition 3 is melted when an abnormal overheat occurs. A space is generated in the fragrance emission suppressing mesh sheet 1, and the fragrance emitted from the microcapsules on the sheet base material 5 passes through the fragrance emission suppressing mesh sheet 1 and diffuses, stimulating the olfactory sense of a nearby person.

The heat-fusible composition 3 effectively suppresses the emission of aroma until it melts, and preserves the aroma in a sealed state for a long period of time. Even when the heat-meltable composition 3 is melted, the aroma is prevented from being emitted in a short time.

[0028]

EFFECTS OF THE INVENTION Since the heat-sensitive label of the present invention continuously emits aroma for a long period of time, it is possible to detect an abnormality simply by circulating without keeping a watchman near the device or by installing or circulating an odor sensor or the like. it can. Further, even in a narrow local area, it is possible to easily and surely know the necessary temperature information of the area at an early stage.

Such a heat-sensitive label is not limited to a power generator, but can be attached to, for example, an electric motor, an air temperature controller, an electronic device, etc., so that the temperature can be controlled by a small number of supervisors and a simple overheat warning device. become.

[0030]

EXAMPLES Examples of the present invention will be described in detail below. The heat-sensitive label 8 of the present invention is manufactured as follows. The adhesive layer 4 is applied to the upper surface of the base material 5, and the microcapsule layer 2 is formed on the adhesive layer 4. The microcapsule layer 2 is covered with the perfume emission suppressing mesh sheet 1 impregnated with the heat-meltable composition 3. The adhesive layer 6 is applied to the lower surface of the base material 5 to form the adhesive layer 6
Is covered with release paper 7.

The adhesive layer 4 includes, for example, thermosetting resin adhesives, thermoplastic resin adhesives, rubber adhesives, emulsion adhesives, acrylic adhesives, oligomer adhesives and adhesives. Can be given. Examples of the adhesive layer 6 include emulsion adhesives, rubber adhesives, acrylic adhesives, and oligomer adhesives.

When the heat-sensitive label 8 is used, the release paper 7 is peeled off and attached to a device which may be overheated, such as a generator. When the device becomes overheated abnormally, the heat-meltable composition 3 is melted and a gap is generated in the perfume emission suppressing mesh sheet 1. The aroma generated from the microcapsule layer 2 passes through the gap of the mesh sheet and is diffused. Observers and odor sensors detect scents and check for overheating abnormalities in equipment.

Example 1 The microcapsule layer 2 is obtained by encapsulating a citrus fragrance by an interfacial polymerization method and stacking it in layers. At this time, the average particle size of the microcapsules forming the microcapsule layer 2 is 150 μm. The fragrance emission control mesh sheet 1 is made of polyester and has an opening of 3
It is 00 μm. Stearyl alcohol (melting point: 55 ° C.), which is the heat-meltable composition 3, is impregnated into the spaces between the mesh sheets. The adhesive layer 4 is SK Dyne 100 (trade name, an acrylic pressure-sensitive adhesive manufactured by Soken Chemical Industry Co., Ltd.). Adhesive layer 4
Thus, the perfume emission suppressing mesh sheet 1 and the base material 5 are bonded to each other. Further, an adhesive layer 6 is attached to the lower surface of the base material 5, and the adhesive layer 6 is covered with a release paper 7.

The heat-sensitive label 8 thus produced is
It is stuck on a heating test stand installed inside a sealed test tank (2400 liters). Heating test stand at 50 ℃
The scent intensity after 60 minutes when heated to 55 ° C. and 55 ° C. was measured by Alabaster UV (scent concentration measuring device manufactured by B & H Lab Inc.), and sensory tests were conducted in parallel. The scent concentration measuring device detects a change in concentration of odor molecules as a change in electric conductivity, and digitizes this. The numerically measured value of the scent intensity is a relative value, and is represented by the unit ALb specified by the company.

As a result, when heated at 50 ° C., the stearyl alcohol impregnated in the perfume emission suppressing mesh sheet 1 did not melt, and the odor of the citrus perfume was not felt. At this time, the scent intensity value measured by the scent concentration measuring device is 2
1 ALb was shown. On the other hand, at the time of heating at 55 ° C., stearyl alcohol impregnated in the perfume emission suppressing mesh sheet 1 was melted, and a gap was generated in the perfume emission suppressing mesh sheet 1. Also, a strong odor of citrus fragrance was felt, and the intensity value of the scent measured by the scent concentration measuring device at this time was
854ALb was shown.

Example 2 Paraffin (melting point: 70 ° C.) was used for the hot-melt composition 3 impregnated in the perfume emission-inhibiting mesh sheet 1, and the other heat-sensitive labels had the same composition as in Example 1. This heat-sensitive label was attached on a heating test table in a test tank, and the scent intensity was measured 60 minutes after the heating table was heated to 65 ° C. and 70 ° C., and a sensory test was performed.

As a result, upon heating at 65 ° C., the paraffin impregnated in the perfume emission suppressing mesh sheet 1 did not melt, and the odor of the citrus perfume was not felt. At this time,
The scent intensity value measured by the scent concentration measuring device was 25 ALb. On the other hand, when heated at 70 ° C., the paraffin impregnated in the fragrance emission suppressing mesh sheet 1 was melted and a gap was generated in the fragrance emission suppressing mesh sheet 1. Further, a strong odor of citrus fragrance was felt, and the fragrance intensity measured by the scent concentration measuring device at this time was 893 ALb.

Example 3 Behenic acid amide (melting point: 105 ° C.) was used as the heat-meltable composition 3 with which the perfume emission suppressing mesh sheet 1 was impregnated, and the construction of the other heat-sensitive labels was in accordance with Example 1. Affix this heat-sensitive label to the heating test stand in the test tank,
After 60 minutes of heating at 0 ° C. and 105 ° C., the fragrance intensity was measured and a sensory test was conducted.

As a result, upon heating at 100 ° C., the behenic acid amide impregnated in the perfume emission suppressing mesh sheet 1 did not melt and the odor of the citrus perfume was not felt. At this time, the scent intensity value measured by the scent concentration measuring device is 27 AL
b is shown. On the other hand, when heated at 105 ° C., the behenic acid amide impregnated in the perfume emission suppressing mesh sheet 1 was melted and a gap was generated in the perfume emission suppressing mesh sheet 1. Further, a strong odor of the citrus fragrance was felt, and the intensity value of the scent measured by the scent concentration measuring device at this time was 910 ALb.

Comparative Example 1 The microcapsule layer 2 was covered with a mesh sheet which was not impregnated with the heat-fusible composition 3 without the mesh sheet 1 for suppressing the perfume emission, and the construction of the other heat-sensitive labels was the same as in Example 1. . This heat-sensitive label was attached to the heating test table in the test tank, and the fragrance intensity measurement and sensory test were performed after 60 minutes when the heating test table was heated to 50 ° C. and 55 ° C. as in Example 1.

As a result, a strong odor of the citrus fragrance was felt when heated at 50 ° C., and the fragrance intensity value measured by the scent concentration measuring device was 839 ALb. Further, even when heated at 55 ° C., a strong odor of the citrus fragrance was felt, and the fragrance intensity value was 857 ALb.

Comparative Example 2 The microcapsule layer 2 was covered with a mesh sheet which was not impregnated with the heat-fusible composition 3 without the perfume emission suppressing mesh sheet 1, and other heat-sensitive labels had the same constitution as in Example 1. . This heat-sensitive label was attached to a heating test table, and the scent intensity measurement and sensory test were performed after 60 minutes when the heating test table was heated to 65 ° C. and 70 ° C. as in Example 2.

As a result, a strong odor of the citrus fragrance was felt when heated at 65 ° C., and the fragrance intensity value measured by the scent concentration measuring device was 881 ALb. Further, even when heated at 70 ° C., a strong odor of the citrus fragrance was felt, and the fragrance intensity value was 892 ALb.

Comparative Example 3 The microcapsule layer 2 was covered with a mesh sheet which was not impregnated with the heat-fusible composition 3 without the perfume emission suppressing mesh sheet 1, and the other constitution of the heat-sensitive label was the same as in Example 1. . This heat-sensitive label was attached to a heating test table, and the fragrance strength and sensory test were performed after 60 minutes when the heating test table was heated to 100 ° C. and 105 ° C. in the same manner as in Example 3.

As a result, a strong odor of the citrus fragrance was felt when heated at 100 ° C., and the scent intensity value measured by the scent concentration measuring device was 903 ALb. Further, even when heated at 105 ° C., a strong odor of the citrus fragrance was felt, and the fragrance intensity value was 907 ALb. Table 1 shows the scent intensity measurement results of Examples 1, 2, and 3 and Comparative Examples 1, 2, and 3.

[0046]

[Table 1]

The microcapsule layer 2 may be one in which a perfume is impregnated into a porous adsorbent, or one in which the perfume is gelled by a gelling agent, in addition to the microcapsule in which the perfume is microencapsulated. In addition, fragrance emission control mesh sheet 1
By covering the upper part of the plate with a plastic film or mesh sheet having holes, the handling can be further improved and the weather resistance can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a heat-sensitive label to which the present invention is applied.

[Explanation of symbols]

1 is a perfume emission suppressing mesh sheet, 2 is a microcapsule layer, 3 is a heat-meltable composition, 4 is an adhesive layer, 5 is a base material, 6
Is an adhesive layer, 7 is a release paper, and 8 is a heat-sensitive label.

 ─────────────────────────────────────────────────── --- Continuation of front page (72) Inventor Takayuki Kuramoto 100-185 Midorigaoka, Midori-cho, Owariasahi-shi, Aichi (72) Inventor Hiromichi Mizusawa 4-28-35 Fujimi, Tsurugashima-shi, Saitama Ark Palace No. 405 (72) Inventor Takaaki Kajiwara 5-6-13 Kasumigakanto, Kawagoe City, Saitama Prefecture

Claims (4)

[Claims] 1. A microcapsule layer containing a perfume is provided on a sheet base material, and the microcapsule layer is covered with a perfume emission suppressing mesh sheet impregnated with a heat-meltable composition. A heat sensitive label. 2. The particle size of the microcapsule layer is 10
The heat-sensitive label according to claim 1, wherein the heat-sensitive label has a thickness of μm to 500 μm. 3. The melting point of the heat-meltable composition is from room temperature to 20.
It is 0 degreeC, The thermosensitive label of Claim 1 characterized by the above-mentioned. 4. The thermosensitive label according to claim 1, wherein the mesh sheet of the perfume emission suppressing mesh sheet has a size of 100 μm to 2000 μm.