JPH0518831A - Gas-discharge body for monitoring temperature - Google Patents

Abstract

PURPOSE:To obtain a proper gas-discharge body for monitoring temperature by using it as a means for preventing an equipment due to contact failure, etc., and an excessive heating accident caused by an abnormal temperature of each connection portion. CONSTITUTION:A capsule 32 where a low boiling-point compound 31 which is turned into gas due to increase in temperature is enclosed and a temperature- indicating pigment 61 which is colored or discolored due to increase in temperature are formed in one piece by forming a paint containing both, allowing it to be supported to a support through an adhesive, to be housed within a bag-shaped body, and then allowing the temperature-indicating pigment 61 to be blended into a wall material of a capsule.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to electric equipment, electric parts,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature monitoring gas emitting body used for monitoring abnormally high temperatures of various equipment such as mechanical equipment and buildings.

In electrical equipment such as a power receiving panel or a distribution panel, there are frequent occurrences of overheating accidents due to faulty tightening of screws at connection points of various electrical devices such as circuit breakers, terminal blocks, cables, and overcurrent due to additional load devices. Therefore, measures to prevent such accidents are desired.

[0003]

2. Description of the Related Art Screws such as bolts and nuts are often used for connecting power cables to circuit breakers, terminal blocks and the like. If the screws for these connections are loosened, the contact resistance value at that portion increases and heat is easily generated, which may lead to an overheating accident depending on the state of the load, that is, the magnitude and time of the flowing current.

Therefore, in these connection works, it is necessary to tighten the screws sufficiently so that the screws at the connection points will not come loose. However, in general, there are a large number of connection points, and there are also locations that are hidden by the device and are not easy to check. Therefore, it is practically difficult to securely tighten all the screws.

Even if the screws are tightened sufficiently at first, the screws may loosen due to vibrations or shocks during use. Therefore, it is necessary to check the looseness of the screws on a daily basis and tighten them further. . However, it is practically difficult to thoroughly check the looseness and retighten it for a long period of time.

In addition to the above-mentioned screws, even in equipment such as electric motors, breakers, electromagnetic switches, cables, etc., when the current flowing therethrough is full or exceeds the rated current, these equipment generate heat. However, depending on the duration of the condition, an overheating accident may occur.

As described above, it is extremely difficult to perform the initial screw tightening, the daily inspection for looseness, and the additional tightening reliably, and even if these are forced, it is caused by the heat generation of the device itself which is not related to the looseness of the screw. It is hard to avoid an overheating accident.

For this reason, conventionally, a color-changing tape that changes color due to a temperature rise is attached in advance to a place where heat may be generated, and the heat generation state of the equipment is monitored by the presence or absence of the color change to prevent an overheat accident. Has been done.

[0009]

However, in the above-mentioned monitoring method using the color-changing tape, it is necessary for the monitoring person to constantly monitor the presence or absence of the color change of the color-changing tape near the device.
Therefore, it was practically difficult to carry out the long-term monitoring normally required by this method.

As a method for monitoring the temperature over a long period of time, a method of providing a temperature sensor at a place where heat may occur can be considered. However, this method requires a large number of temperature sensors, detectors, and wirings for connecting these, and is extremely expensive as a maintenance facility for equipment, so it cannot be said to be a practical method.

In view of the above-mentioned circumstances, conventionally, it has been desired to develop a temperature monitoring means capable of effectively and economically preventing an overheating accident of equipment.

The present invention has been made to meet such a demand, and is suitable for temperature monitoring used as a means for preventing an overheating accident resulting from an abnormally high temperature of a device or each connection point due to, for example, poor contact. The purpose is to provide a gas emitter.

[0013]

In order to solve the above-mentioned problems, a gas emitting body GH according to the invention of claim 1 is a low boiling point compound 31 which is gasified by a temperature rise as shown in FIGS. 1 to 5. Capsules 32, 51, 71 in which are encapsulated, and a temperature-sensitive pigment 61 that changes color or changes color due to the temperature rise,
It is integrated and configured.

The gas discharger GH according to the invention of claim 2 is
The capsule 32 in which the low boiling point compound 31 is enclosed and the thermochromic pigment 61 are integrated by being mixed in the paint 33.

The gas discharger GH according to the invention of claim 3 is
The capsule 32 in which the low boiling point compound 31 is enclosed and the thermochromic pigment 61 are integrated by being supported by the supports 41 and 45.

[0016]

When the temperature rises, the capsules 32 and 51 are destroyed by the rise of the internal pressure caused by the gasification (vaporization) of the low boiling point compound 31 enclosed therein, or by the softening of the capsule wall material due to the high temperature. It

When the capsules 32 and 51 are broken, the vaporized gas is released to the outside. Also, capsules 32, 5
Capsule 3 by increasing internal pressure without destroying 1
The gas may be released to the outside by the expansion of the gas permeation of 2, 51 to increase the gas permeability. The gas released from the capsules 32 and 51 activates a gas detector to generate an alarm or the like.

The temperature indicating pigment 61 is colored or discolored due to a rise in temperature, thereby notifying the heat generation point. When the temperature indicating pigment 61 is filled in the capsule 51, the temperature indicating pigment 61 also flows out due to the breakage of the capsule 32.

[0019]

Embodiments of the present invention will now be described in more detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications may be made without departing from the scope of the invention. It can be carried out.

FIG. 1 is a cross-sectional view showing a state in which a gas releasing paint GH1 which is an embodiment of the gas releasing body GH according to the present invention is applied to a predetermined location EQ such as a head of a screw which may generate heat. Is.

The illustrated gas releasing paint GH1 is a paint that releases a gas that can be detected by a gas detector when the temperature rises, and a capsule 32 containing a low boiling point compound 31 and a temperature indicating pigment 61 are dispersed in the paint 33. And are integrated. Hereinafter, the capsule in which the low boiling point compound 31 is enclosed (or filled) may be referred to as a gas releasing capsule GC.

The low boiling point compound 31 varies depending on the type of equipment to be monitored for temperature, rated temperature, heat resistant temperature, operating conditions, detection method of gas detector 12, sensitivity, other operating conditions, environmental conditions, etc. However, the boiling point is generally in the range of about 30 to 200 ° C, preferably 60 to 120.
Liquids in the ° C range are used. The gas detector 12
In the case of using the catalytic combustion type as, it is necessary to use a liquid that produces a flammable gas as the low boiling point compound 31.

Specific examples of the low boiling point compound 31 include butane, pentane, hexane, heptane, octane and other aliphatic hydrocarbons, benzene, toluene, xylene and other aromatic hydrocarbons, methyl alcohol, ethyl alcohol, propyl. Alcohols such as alcohol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, t-butyl alcohol, amyl alcohol, isoamyl alcohol, esters such as methyl acetate, ethyl acetate, propyl acetate, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, etc. And ketone glycols such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether and propylene glycol monomethyl ether. These may be used alone or in combination of two or more as needed.

The low boiling point compound 31 and the capsule 32 are
10 to 90%, preferably 4 with respect to the total weight of
The amount is 0 to 70%.

The wall material of the capsule 32 is made of a material which is destroyed by the increase of the internal pressure when the temperature of the low boiling point compound 31 enclosed therein exceeds the boiling point. As the wall material of the capsule 32, various conventionally known organic materials and inorganic materials can be used. Organic materials include acrylic resins, vinyl acetate resins, vinylidene resins,
Examples include gelatin, acetalized products of polyvinyl alcohol, and vinyl chloride resins. Examples of the inorganic material include metal oxides, for example, silicate compounds such as sodium silicate and potassium silicate.

The average particle size of the capsule 32 is 10 to 40 μm.
Degrees are generally preferred.

Capsule 32 enclosing the low boiling point compound 31
Is usually 10 to 90 in the dry coating film of the gas releasing paint GH1.
%, Preferably about 50 to 80%. If it is less than 10%, the amount of gas released is small and detection becomes difficult, and if it exceeds 90%, it becomes difficult to integrate it by making it into a paint.

The capsule 32 containing the low boiling point compound 31 as described above is produced by various conventionally known production methods such as an in-site polymerization method and an interfacial polymerization method.

The temperature-indicating pigment 61 is a substance that exhibits a color or discolors due to a temperature rise caused by heat generation of equipment, and there are compounds such as dyes, pigments, and cholesteric liquid crystals. Represent a substance. The temperature indicating pigment is generally classified into three types, i.e., an irreversible temperature indicating pigment, a quasi-reversible temperature indicating pigment, and a reversible temperature indicating pigment, but the temperature indicating pigment 61 in the present invention is not particularly limited. However, it is preferable that the color difference before and after the color change is large, which allows easy confirmation of the color change.

Here, the irreversible thermochromic pigment is one that undergoes a chemical reaction or thermal decomposition at a constant temperature to change its color and does not restore the color even after the temperature is lowered, and a quasi-reversible thermochromic pigment changes its color at a constant temperature. After that, the color is not restored by the temperature change, but the color is restored by applying humidity. Further, the reversible thermochromic pigment is a pigment that changes color at a constant temperature and then immediately returns to color when the temperature is lowered.

Commercially available products of the temperature-indicating pigment 61 are, for example, Daiichi Seika Kogyo Co., Ltd., Daithermo PI-70 (trade name, irreversible, discoloration temperature 70 ° C., color change: light brown to black). Dithermo PI-110 (trade name, irreversibility, discoloration temperature 110 ° C, color change: discolored from white to black), Dithermo PF-110 (trade name, semi-reversible, discoloration temperature 110 ° C, color made by the same company) Change: change from light green to blue-purple).

The temperature-sensitive pigment 61 is blended so as to be contained in the dry coating film of the gas releasing paint GH1 in an amount of usually 2 to 50% by weight (hereinafter abbreviated as "%"), preferably about 5 to 20%. It If it is less than 2%, it becomes difficult to distinguish the discoloration,
Further, if it exceeds 50%, the release of gas is suppressed, which is not preferable.

The types of color change of the gas releasing paint GH1 according to the present invention due to the temperature rise are as follows:
Also, it can be appropriately set by changing the mixing ratio of the other components in the paint 33 with respect to the temperature indicating pigment 61.

The paint 33 contains a binder and the like,
As a result, an appropriate number of capsules 32 and temperature-sensitive pigments 61 are integrated and attached to the device. As the paint 33, there are one that forms a porous coating film so that the gas released from the capsule 32 can be released to the outside of the coating film, and one that the coating film is destroyed by the destruction of the capsule 32. Used.

As the binder, vinyl acetate emulsion, vinyl acetate-acrylic emulsion, vinyl acetate-
Veova emulsion, acrylic emulsion, styrene-acrylic emulsion and the like are preferably used.

The binder is blended in the paint 33 so that it is usually contained in the dry coating film of the gas releasing paint GH1 in an amount of about 5 to 50%, preferably about 10 to 20%. If it is less than 5%, the bonding of the respective components will be insufficient, and if it exceeds 50%, the release of gas will be suppressed, so both are not preferable.

The gas releasing paint GH1 has 5 parts in the dry coating film.
The non-thermophilic pigment may be blended in an amount not exceeding 0%. When it exceeds 50%, the release of gas is suppressed, which is not preferable. As non-thermophilic pigments, extenders such as calcium carbonate, talc, barium sulfate and clay, titanium,
Color pigments such as red iron oxide, yellow lead, azo pigments, and acid value chromium are preferably used. In addition, various additives such as a thickener and a stabilizer for preventing sagging may be blended in the gas releasing paint GH1 as required.

The method of applying the gas releasing paint GH1 is not particularly limited, and it can be applied by a usual application method such as brush coating or spray coating. In the case where the application target is a metal or the like for which it is difficult to secure the adhesion of the coating film, it may be applied with a primer treatment if necessary. However, in this case, it is important to apply a thin coat of the primer so as not to hinder heat conduction. By applying the gas releasing paint GH1 in this way,
It can also be expected to have the side effect of preventing loosening of connecting screws and protecting the surface of the device.

In the gas releasing paint GH1 as described above, the heat is generated at the predetermined location EQ, and the low boiling point compound 31 is generated accordingly.
When the boiling point reaches the boiling point, the low boiling point compound 31 is vaporized and the internal pressure of the capsule 32 rises, whereby the capsule 32 is broken, and the vaporized low boiling point compound 31 permeates the coating film of the paint 33 and is released to the outside. It

The temperature-sensitive pigment 61 has the above-mentioned predetermined portion E.
Due to the heat generation of Q, the temperature rises to reach a coloring or discoloring temperature, and the coloring or discoloring occurs according to respective mechanisms such as desorption of crystal water, chemical reaction between components, and electron transfer.

FIG. 2A shows the gas discharger GH according to the present invention.
FIG. 2B is a front view of a gas discharge ribbon GH2 that is another embodiment of the above, and FIG. 2B is a plan view thereof.

In the illustrated gas releasing ribbon GH2, the gas releasing capsule GC and the thermochromic pigment 61 are integrated by being adhered to a tape 41 made of a thin flexible vinyl chloride resin material having flexibility with an adhesive. .

The gas release ribbon GH2 is attached to the above-mentioned predetermined location EQ by an adhesive, with the surface on which the gas release capsule GC and the temperature indicating pigment 61 are attached as the attachment surface. As the adhesive at the time of sticking, the above-mentioned adhesive used at the time of attaching the gas releasing capsule GC or the like may be used. When attaching the tape 41,
It is essential that the gas release capsule GC is not sealed by the tape 41 in order to allow the gas to be released to the outside.

As shown in a plan view in FIG. 2 (c), a gas releasing ribbon GH2 is provided on a long tape 42 having perforations 43 at regular intervals, and the gas releasing capsule GC and the temperature indicating pigment 6 are provided.
1 may be attached to each other so that the necessary units can be separated along the perforations 43 at the time of use.

In the gas discharge ribbon GH2, the gas discharged from the gas discharge capsule GC due to the temperature rise is discharged to the outside through the gap between the predetermined portion EQ and the tape 41.

FIG. 3A shows the gas discharger GH according to the present invention.
FIG. 3B is a cross-sectional view of a gas discharge ribbon GH3 that is another embodiment of the present invention, and FIG.

In the illustrated gas releasing ribbon GH3, the gas releasing capsule GC and the temperature indicating material 61 are two tape members 4 each.
5a and 45b are sealed and integrated inside a bag-like body 45 that is bonded with an adhesive.

In this gas release ribbon GH3, an ethylene-vinyl acetate copolymer is used as an adhesive agent for bonding the tape members 45a and 45b to each other so that the gas released from the gas release capsule GC can be released to the outside. A peelable sealant such as (EVA) is used, or the tape members 45a and 45b are made of a material that is partially broken by pressure or softened to have holes.

This gas discharge ribbon GH3 is also shown in FIG. 2 (c).
Similar to the gas releasing ribbon GH2 shown in FIG. 3, perforations may be provided at regular intervals so that the tape can be separated from a long tape when used, and FIG.
As shown in (c), a slit 48 may be provided near the perforation 47 of the long tape 46.

FIG. 4 is a sectional view of a gas discharge tube GH4 which is another embodiment of the gas discharger GH according to the present invention.

In the illustrated gas discharge tube GH4, a low boiling point compound 31 and a thermochromic pigment 61 are filled in a long tube 51 made of a synthetic resin or the like and sealed at regular intervals to be integrated. In the present specification, the tube is regarded as a soft capsule, and this is included in the concept of a capsule in a broad sense.

As the tube 51, the capsule 3 described above is used.
In addition to the same material as that of 2, a material having a large barrier property for the low boiling point compound 31 is used. The diameter of the tube 51 is
It is usually about 2 to 4 mm, but is not particularly limited. The material and sealing method of the tube 51 are selected so that the low boiling point compound 31 can be released to the outside due to the temperature rise. When the gas discharge tube GH4 is used, the necessary number is cut off at the sealing portion of the tube 51.

FIG. 5 is a sectional view of a gas discharge tube GH5 which is another embodiment of the gas discharger GH according to the present invention.

In the illustrated gas discharge tube GH5, the temperature indicating pigment 61 is blended and integrated in the wall material of the long tube 71, which is different from the above gas discharge tube GH4. The wall material itself of the tube 71 is preferably transparent. However, when laminated, an aluminum laminate film, an aluminum vapor deposition film or the like can be used for the inner layer.

In the gas discharge tubes GH4 and GH, the tubes 51,
The internal pressure of 71 rises, which causes the tubes 51, 71
Is destroyed, and the gas of the vaporized low boiling point compound 31 is released to the outside.

The gas discharge tubes GH4 and GH have a simple structure and can be manufactured at low cost.

The gas releasing ribbons GH2 and GH3 and the gas releasing tubes GH4 and GH5 are all attached to an apparatus or suspended inside a distribution board or a room with an adhesive, a paint, an adhesive tape, a string-like body, or the like. Used and used.

The amount of the low boiling point compound 31 contained in each of the gas discharge ribbons GH2 and GH3 and the gas discharge tubes GH4 and GH5 is kept constant so that the gas detector 12 discharges the amount of gas required for detection. By using one or a plurality of predetermined gas release ribbons GH2, 3, the gas detector 12 can reliably detect the gas.

According to the above embodiment, the low boiling point compound 31
Is encapsulated in the capsule 32 or the tubes 51, 71, gas is not released until the capsules 32 or the tubes 51, 71 are destroyed by the temperature rise, and the capsules 32 or the tubes 51, 71 are destroyed. Since the gas is released for the first time and the gas concentration changes rapidly, the gas detector 12 can easily detect the gas.

Further, the capsule 32 or the tubes 51, 7
As long as 1 is not destroyed, the low boiling point compound 31 is stored in the almost original state for a long period of time, and therefore the usable period of the gas emitting body GH is long.

FIG. 6 shows an example of an abnormal high temperature monitoring system in the case of performing temperature monitoring using the gas discharger GH according to the present invention, which uses the above-mentioned gas discharge paint GH1 as the gas discharger GH. Is.

The illustrated abnormal high temperature monitoring system 1 includes a breaker BK in a large number of distribution boards 11 (only one is shown in the figure), an electromagnetic switch MS, a screw for connecting the terminal block TB and the cable DS. Predetermined location E that may generate heat such as NJ
Gas releasing paint GH1 applied to Q, a gas detector 12 which is attached to the upper part of the inner wall of the distribution board 11, detects the gas generated in the distribution board 11 and outputs an output signal S1, and the gas detector The central monitoring panel 21 that receives and processes the output signal S1 from 12 and the gas detector 12 to the central monitoring panel 21
The output signal line 13, 13, ...

The gas releasing paint GH1 is, for example, a distribution board 11
When checking the screw tightening during the connection work inside,
A predetermined amount or more is applied to confirm that the equipment has been checked, such as when checking the model of the equipment or checking whether the connection to the equipment is correct.

As the gas detector 12, a contact combustion type is suitable, and various conventionally known types such as a semiconductor type, a hot wire type semiconductor type, a thin film type, etc. depending on the kind of the gas releasing paint GH1. Used.

The central monitoring panel 21 identifies a receiving section 22 for receiving and receiving the output signal S1 from each gas detector 12, a display section 23 for displaying an abnormal place and its contents, an alarm lamp 24, and an alarm buzzer 25. When the output signal from each gas detector 12 exceeds the set value corresponding to the gas concentration, the receiver 22 outputs the alarm signal S2, turns on the alarm lamp 24, and outputs the alarm buzzer 25. And the name, number, position, etc. of the distribution board 11 are displayed.
3 is displayed.

In the abnormal temperature monitoring system 1 as described above, when the distribution board 11 is in use, the connection screw NJ may be loosened or a large amount of current may flow through the breaker BK, the electromagnetic switch MS, and the cable DS. When heat is generated and the temperature rises, gas is released from the gas releasing paint GH1 applied to the heat generating portion, and the gas is filled in the distribution board 11.

The gas detector 12 detects the gas concentration in the distribution board 11 and outputs an output signal S1 corresponding to the gas concentration. When the output signal S1 exceeds a preset level, the central monitoring board 21 issues an alarm.

As a result, it is possible to easily know that an abnormally high temperature has occurred in the distribution board 11 in the central monitoring room in which the central monitoring board 21 is installed, and to check the distribution board 11 and the load, It is possible to prevent an overheat accident by taking appropriate measures such as stopping power transmission to the distribution board 11 or disconnecting the load.

Here, in the gas releasing paint GH1,
Since the temperature-indicating pigment 61 is mixed, the color change or discoloration occurs as the gas is released. Therefore, a staff member who receives the alarm calls the site and finds a discolored portion in the distribution board 11 to easily and quickly identify in which part of the distribution board 11 the abnormally high temperature has occurred. Therefore, it is possible to quickly perform the subsequent recovery work and necessary measures.

The presence or absence of discoloration of the temperature-sensitive pigment 61 will be finally visually checked directly by the ITV.
You may make it monitor using (industrial camera) etc.

In the above examples, the low boiling point compound 31
Type, size, shape and material of the capsule 32, the number of the gas releasing capsules GC per one gas releasing body GH, the shape and material of the device to which the gas releasing body GH is attached, the temperature at which the gas is released, and the minutes. Various changes can be made according to the capacity of the electric panel 11, the type of the gas detector 12 used, and other conditions.

In the above-mentioned embodiment, the release of the vaporized low-boiling point compound 31 does not necessarily require the destruction of the capsule 32. For example, the capsule 32 may be configured to be melted by an increase in temperature or expanded by an increase in internal pressure to increase gas permeability.

In the above-mentioned embodiment, a plurality of types of gas dischargers GH having different gas discharge temperatures are used, and these are used as the distribution board 1.
If the device is selectively used according to the type of device in 1, the temperature state of the device can be monitored more finely. In that case, it is convenient to make the color of the temperature indicating pigment 61 different depending on the temperature at which the gas is released.

In the above-mentioned embodiment, the place where the gas releasing body GH is applied or attached may be an appropriate place inside the distribution board 11 or outside the distribution board 11. In that case,
The gas detector 12 may be provided near the gas discharger GH.

The gas discharger GH may be provided without directly contacting the device, that is, separated from the device. Therefore, for example, the gas release ribbons GH2 and GH3 and the gas release tube GH4 can be suspended in the distribution board 11 or in the room. Further, the gas detector 12 may be provided in various control panels, or in a room such as a power receiving room or a substation room, and an abnormally high temperature of equipment installed in each panel or room may be monitored.

Further, as the equipment, in addition to the above-mentioned electric parts, other electric parts, electric equipment such as elevators, mechanical equipment such as machine tools, automobiles, aircrafts, ships, buildings, etc. It can be applied to monitor abnormal high temperature of equipment.

In the above embodiment, the structure of the central monitoring board 21 can be variously changed. The central monitoring board 21 or a part thereof may be provided inside or in the vicinity of each distribution board 11. Further, the receiving unit 22 may be provided inside the gas detector 12 and the alarm signal may be output from the gas detector 12 when it is detected that the concentration of the gas exceeds a certain level.

[0078]

Specific Examples Three kinds of gas releasing paints GH11 to GH13 were prepared, and their gas releasing properties and temperature indicating properties were examined. (1) Preparation of gas releasing paints GH11-13

(Production Example 1) 7 parts by weight of a thermochromic pigment (hereinafter,
(Abbreviated as “part”) and 3 parts of a filler are put into 10 parts of a 3% aqueous solution of hydroxypropylmethylcellulose, and mixed by stirring to disperse both substances, and then the other substances are added in the respective parts shown below. Gas releasing paint GH11 was prepared by uniformly stirring and mixing for 5 minutes. Thermochromic pigment (Dythermo PI-110) 7 parts Filler (calcium carbonate) 3 parts Hydroxypropylmethylcellulose (3% aqueous solution) 10 parts Microcapsule cake filled with n-heptane (filling rate 55%, average particle size 20 μm, water content) 56%) 70 parts Vinyl acetate emulsion (nonvolatile content 50%, viscosity 18000 csp / 25 ° C) 20 parts

(Production Example 2) 10 parts of the thermochromic pigment was added to 10 parts of a 3% aqueous solution of hydroxypropylmethyl cellulose, and the mixture was stirred and mixed to disperse both substances, and then the other substances were added in the respective amounts shown below. Gas releasing paint GH12 was prepared by uniformly stirring and mixing for 5 minutes. Thermochromic pigment (Dythermo PF-110) 10 parts Hydroxypropyl methylcellulose (3% aqueous solution) 10 parts Microcapsule cake filled with n-hexane (filling rate 55%, average particle size 20 μm, water content 56%) 70 parts Vinyl acetate- Veova copolymer emulsion (nonvolatile content 50%, viscosity 10000 csp / 25 ° C) 20 parts

(Production Example 3) 10 parts of a thermochromic pigment and 3 parts of a filler were added to 10 parts of a 3% aqueous solution of hydroxypropylmethyl cellulose, and the mixture was stirred and mixed to disperse both substances.
The gas releasing coating composition GH13 was prepared by adding the other materials in the respective amounts shown below and stirring and mixing the mixture uniformly for 5 minutes. Thermochromic pigment (Dythermo PI-70) 7 parts Filler (calcium carbonate) 3 parts Hydroxypropyl methylcellulose (3% aqueous solution) 10 parts Microcapsule cake filled with n-heptane (filling rate 50%, average particle size 15 μm, water content) 36%) 75 parts Vinyl acetate emulsion (nonvolatile content 50%, viscosity 18000 csp / 25 ° C) 15 parts

The above-mentioned microcapsule cake is
All of them were produced by the in-situ polymerization method, and the capsule wall material was made of an acrylic resin and had a strength to break when the internal pressure became about 1.5 to 2 atm.

(2) Gas-releasing property and temperature indicating property Three kinds of gas-releasing paints GH11 to GH11 prepared in Production Examples 1 to 3
The gas releasing property and temperature indicating property of 13 were investigated. The gas detector 12 has a minimum gas concentration sensing capacity of 20 ppm.
The contact combustion type was used. In addition, the receiving unit 22
Was set to output the alarm signal S2 when the gas concentration reached 60 ppm.

First, 0.2 g of each of the gas releasing paints GH11 to 13 was applied by brush coating to a stainless steel plate, and left to stand for 24 hours to dry to prepare three test pieces.

Next, each test piece was placed on a hot plate and heated in a 50 liter sealed container. Then, when the temperature of the test piece reached about 120 ° C., the capsule 32 of all the test pieces broke and n-heptane was released. When the gas concentration in the sealed container was measured, all were 60 ppm or more.

Further, the presence or absence of discoloration of each test piece was examined. As a result, the test piece to which the gas releasing paint GH11 was applied was changed from white to black, the test piece to which the gas releasing paint GH12 was applied was changed from light green to bluish purple, and The test pieces coated with the release paint GH13 were discolored from light brown to black.

[0087]

According to the present invention, it is possible to provide a gas discharger for temperature monitoring capable of effectively and economically preventing an overheating accident by monitoring an abnormally high temperature of a device or each connection portion due to a connection failure or the like. .

According to the second aspect of the present invention, there are secondary effects such as screw loosening prevention and surface protection.

According to the third aspect of the present invention, there is a degree of freedom in attachment to the equipment, and the number of gas dischargers required for temperature monitoring can be easily selected according to the sensitivity of the gas detector.

[Brief description of drawings]

FIG. 1 is a view showing a state in which a gas releasing paint according to the present invention is applied.

FIG. 2 is a front view and a plan view of a gas releasing ribbon according to the present invention.

FIG. 3 is a cross-sectional view and a plan view of a gas discharge ribbon according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a gas discharge tube according to the present invention.

FIG. 5 is a cross-sectional view of a gas discharge tube according to another embodiment of the present invention.

FIG. 6 is a diagram showing an example of an abnormal high temperature monitoring system used for implementing the present invention.

[Explanation of symbols]

GH gas emitter GH1 gas releasing paint (gas releasing body) GH2,3 gas emission ribbon (gas emission body) GH4,5 Gas release tube (gas release body) 31 Low boiling point compounds 32 capsules 33 paint 41 tape (support) 45 Bag-shaped body (support) 51,71 tubes (capsules) 61 Thermochromic pigment

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Makoto Hayashi             1-20-10 Oi, Shinagawa-ku, Tokyo Fujitsu             System Construction Co., Ltd. (72) Inventor Shinichi Fujita             1-20-10 Oi, Shinagawa-ku, Tokyo Fujitsu             System Construction Co., Ltd. (72) Inventor Sumio Nakauchi             1-20-10 Oi, Shinagawa-ku, Tokyo Fujitsu             System Construction Co., Ltd. (72) Inventor Kazuki Hanamura             1-3-18 Takami, Konohana-ku, Osaka-shi, Osaka Prefecture             Toago Paint Co., Ltd. Osaka factory (72) Inventor Michihiro Masuda             1-3-18 Takami, Konohana-ku, Osaka-shi, Osaka Prefecture             Toago Paint Co., Ltd. Osaka factory

Claims (3)

[Claims] 1. A gas-releasing body (GH) for temperature monitoring, which emits a gas detectable by a gas detector when the temperature rises, wherein a low boiling point compound (31) which is gasified by the temperature rise is encapsulated. (32) (51) (71) and a temperature-indicating pigment (61) that is colored or discolored due to a rise in temperature thereof are integrated, and a gas discharger for temperature monitoring is provided. 2. A paint (33) comprising a capsule (32) in which a low boiling point compound (31) which is gasified by an increase in temperature is enclosed and a thermochromic pigment (61) which is colored or discolored by the increase in temperature. The gas emitting body for temperature monitoring according to claim 1, which is integrated by being blended. 3. A support (41) (having a capsule (32) in which a low boiling point compound (31) which is gasified by an increase in temperature is encapsulated and a thermochromic pigment (61) which is colored or discolored by the increase in temperature. The gas discharger for temperature monitoring according to claim 1, which is integrated by being supported by 45).