JPH1090244A - Moisture detection label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moisture detection label making a distinct discoloration when moisture is detected, unrestoring to the original color after once discolored, and never discoloring by moisture sticking to it from the surface or by dew condensation even if it is used in a highly moisted environment. SOLUTION: The moisture detection label is provided with a coloring layer 2 on one side of a permeable film 1 and the coloring layer 2 is composed of water soluble dye 0.001 to 5 weight percentage and an inky vehicle which is a soluted material in a solvent of a resin of at least one kind selected among a cellulosic resin, an acrylate resin, a polyester resin, a polyamide resin, a polyacetal resin, a silicone resin, a polyurethane resin, an epoxy resin and a petroleum resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture detection label for detecting water leakage.

[0002]

2. Description of the Related Art Water leaks caused by damage to tanks storing water and water supply pipes and water leaks caused by damage to waterproofing treatment of tunnels and buildings must be detected at an early stage. Water leakage is generally found by visually inspecting the leakage of water. However, there is a problem that a small amount of water may be overlooked by visual inspection, or may not be found when the leakage stops and the water is dried. Therefore, there has been a demand for a means capable of easily detecting water leakage without relying on visual observation. As a conventional device for detecting a water leak, for example, Japanese Patent Application Laid-Open
JP-A-194, JP-A-6-202560 and JP-A-7-55788 disclose an indicator in which a substance that changes color when reacted with moisture is supported on a substrate.

[0003]

However, when these indicators detect moisture, the discolored portion may be small and indistinct even when moisture is detected, or when moisture is adhered from the surface or when used in an environment with high humidity, dew condensation may occur. In some cases, discoloration occurs, making detection impossible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the color is clearly changed when moisture is detected. After the color change, the color does not return to the original color even if it is dried. Another object of the present invention is to provide a moisture detection label which does not discolor due to adhesion of moisture from the surface or condensation.

[0005]

According to the moisture detecting label of the present invention made to achieve the above object, as shown in FIG. 1, a color-forming layer 2 is provided on one surface of a water-permeable film 1;
The coloring layer 2 is composed of 0.001 to 5% by weight of a water-soluble dye and an ink vehicle, and the ink vehicle is a cellulose resin, an acrylic resin, a polyester resin, a polyamide resin, a silicone resin, a polyacetal resin,
It is obtained by dissolving at least one resin selected from a polyurethane resin, an epoxy resin and a petroleum resin in a solvent.

The solvent is aromatic hydrocarbons such as benzene, toluene and xylene, saturated hydrocarbons such as hexane, cyclohexane and octane, ketones such as acetone, methyl ethyl ketone and cyclohexanone, halogenated hydrocarbons such as chloroform and trichloroethane, and mineral spirits. And at least one selected from petroleum solvents of petroleum ether. The ink vehicle may be a commercially available ink medium.

If the amount of the water-soluble dye is less than 0.001% by weight, the color density of the color-forming layer 2 after discoloration is low, and if it exceeds 5% by weight, the color before discoloration becomes deep, and the color difference between before and after discoloration. Is small, it becomes difficult to determine.

As shown in FIG. 2, the moisture detecting label of the present invention for achieving the above object has a water-permeable film 1 provided with a coloring layer 2 on one side, and the coloring layer 2 is made of a water-soluble dye. 0.001 to 5% by weight and an ink vehicle, and a transparent waterproof layer 3 is provided on the surface. The transparent waterproof layer 3 improves the waterproof property against moisture due to adhesion of moisture from the surface of the moisture detection label and dew condensation.

The color forming layer 2 preferably contains 70% by weight or less of the opaque powder. 70% by weight of opaque powder
Is exceeded, the applicability of the coloring layer 2 to the water-permeable film 1 becomes poor.

The water-permeable film 1 absorbs moisture quickly,
Any material that has sufficient strength even when it is transmitted and wetted may be used, and examples thereof include paper and non-woven fabric.

The water-soluble dye is Kayanol Red N
BR, Brilliant Scarlet 3B, Acid Fast Orange SG, Amaranth, Acid Rhodamine
B, Eosin G, Acid Milling Red RS, Alizarin Direct Blue AGG, Indigo Carmine Blue G, Acid Milling Cyanine 5R Acid Dye, Eisen Cation Red 7BNH, Cation Red 6B, Cation Pink FG, Crystal Violet, Methylene Blue B Basic Dye , Kayanol Light Red F5B, Direct Fast Scarlet 4BS, Benzopurpurin 4B, Direct Fast Orange S, Direct Rougeulin Red B,
Chlorunch Fast Red 6BLL, Syria Red 4B, Serious Splat Red Violet RL, Serious Splat Violet BL, Direct Sky Blue 5B Direct Dye, Chrome Orange A, Chrome Orange GR, Chrome Red B, Chrome Brilliant Red B, Chrome Brilliant Violet R , Chrome Brown PG acid mordant dye, Sumifix Brilliant Red G Special, Reacton Red 2
BF, Procionrubin BS, Cibacron Violet F2R-A, Procion Brilliant Blue R
S reactive dye, food red 2, food red 3, food red 4, food red 102, food red 103
, Food Red No. 104, Food Red No. 105, and Food Red No. 106 are preferably at least one selected from food dyes.

The transparent waterproof layer 3 is made of polyethylene, polystyrene, polypropylene, polyvinyl chloride, polyvinyl fluoride, cellophane film, silicone resin, polyamide resin, cellulose resin, acrylic resin, epoxy resin, or synthetic rubber. It is preferable that the varnish is made of at least one selected from varnishes.

The opaque powder is used for concealing the color of the water-soluble dye before discoloration and for improving the dyeability at the time of discoloration and the color retention after discoloration, and includes magnesium carbonate, calcium carbonate, barium carbonate, It is preferably at least one selected from magnesium hydroxide, magnesium oxide, calcium oxide, titanium oxide, silicic acid, magnesium silicate, aluminum silicate, acid clay, kaolin, bentonite, and sericite.

The color-forming layer 2 may contain an extender, a thickener, a dispersant, a color tone adjuster, a stabilizer, an antioxidant and the like which do not inhibit the color formation.

Further, in order to fix the label of the present invention at the place of use, as shown in FIG. 3, an adhesive layer 4 is provided on the back surface, peripheral portion, etc. of the water-permeable film 1, and a release paper 5 is provided on the adhesive layer 4. Then, the release paper 5 may be peeled off and attached when using the moisture detection label.

The moisture detection label is manufactured as follows. First, a water-soluble dye, a concealing powder, and an ink component of an ink vehicle are dispersed and kneaded using a ball mill, a three-roll mill, a stirrer, a grinder, a sand mill, a disperser, or the like to form an ink. The obtained ink is applied to the water-permeable film 1 by a method such as screen printing, gravure printing, offset printing, coating, or spraying with a spray to form a color-forming layer 2 to produce a moisture detection label. When providing the transparent waterproof layer 3 on the moisture detection label,
If the waterproof layer component is a film, laminate it by dry lamination, extrusion lamination, heat lamination, etc.If the waterproof layer component is a varnish, print, spray, brush coat, potting roll coat, knife coat, air knife coat, etc. Overcoat.

The moisture detection label is installed in a tank, a pipe, or the like, and when there is a water leak, the moisture permeates through the water permeable film 1.
When the water reaches the coloring layer 2, the water penetrates into the coloring layer 2, the water-soluble dye is dissolved, and the water-permeable film 1 and the opaque powder are dyed. Therefore, since the dyed state is maintained, the color does not return to the original state. In addition, even if moisture adheres to the surface due to adhesion of moisture or condensation from the surface, the moisture does not penetrate into the color forming layer 2 and thus does not discolor.

[0018]

The moisture detection label of the present invention changes color distinctly when moisture is detected, does not return to its original color even when dried, and does not change color even if moisture adheres to the surface. Therefore, it is possible to easily and surely detect breakage of a leak location such as a tank or a water supply pipe, or a waterproof location such as a tunnel or a building.

[0019]

Embodiments of the present invention will be described below in detail. Examples 1 to 13 are examples showing a moisture detection label provided with a coloring layer to which the present invention is applied, and Comparative Examples 1 to 3 are examples showing a label to which the present invention is not applied.

Example 1 As a water-soluble dye, Food Red No. 4 (San-ei Chemical Industry Co., Ltd.)
1% by weight, and 9% by weight of a resin of ethyl cellulose (Ethocel: Dow Chemical Co., Ltd.) dissolved in 90% by weight of xylene solvent as an ink vehicle were kneaded with a raiser to obtain a color forming ink. Apply this ink to filter paper (N
o. 4: Advantech Toyo Co., Ltd.) was screen-printed to produce a pale red moisture detection label.

The label was subjected to a discoloration test. After dropping 0.01 ml of water from the back of the label to allow water to adhere to it and measuring the area of color change and discoloration,
After drying for 4 hours, the color change was observed. Next, 10 ml of water was dropped from the surface of the label, and the change in color was observed by attaching water. Table 1 shows the results.

[0022]

[Table 1]

As shown in the table, when moisture was applied from the back of the moisture detection label, the label was clearly discolored and displayed in an enlarged manner, and did not return to the original color even when dried. When moisture was allowed to adhere from the surface, no discoloration was observed even after one week of standing.

Example 2 As a water-soluble dye, Food Red No. 4 (San-ei Chemical Industry Co., Ltd.)
0.1% by weight, silicic acid (AEROSIL
380: 30% by weight of Nippon Aerosil Co., Ltd .; 6% by weight of a resin of ethylcellulose (Ethocel: Dow Chemical Company) as an ink vehicle; 63.9% by weight of xylene solvent
Was dissolved and kneaded with a grinder to obtain a coloring ink. This ink was screen-printed on filter paper (No. 4: manufactured by Advantech Toyo Co., Ltd.) to produce a white moisture detection label.

A discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 3 As a water-soluble dye, Food Red No. 4 (San-ei Chemical Industry Co., Ltd.)
0.001% by weight, silicic acid (AERO
SIL 380: 30% by weight of Nippon Aerosil Co., Ltd.), 6% by weight of a resin of ethyl cellulose (Ethocel: Dow Chemical Co.) as an ink vehicle, and a solvent of xylene 63.99.
The solution dissolved in 9% by weight was kneaded with a grinder to obtain a color forming ink. This ink was screen-printed on filter paper (No. 4: manufactured by Advantech Toyo Co., Ltd.) to produce a white moisture detection label.

A discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 4 As a water-soluble dye, Food Red No. 4 (San-ei Chemical Industry Co., Ltd.)
5% by weight, silicic acid (AEROSIL 38)
0: 30% by weight of Nippon Aerosil Co., Ltd.) and 6% by weight of a resin of ethyl cellulose (Ethocel: Dow Chemical Co., Ltd.) dissolved in 59% by weight of xylene solvent as an ink vehicle were kneaded with a rake machine. A coloring ink was obtained. This ink was applied to filter paper (No. 4: Advantech Toyo)
Screen printing was carried out to produce a white-pink moisture detection label.

The discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 5 Aizen cationic red 7BNH as a water-soluble dye
A white moisture detecting label was produced in the same manner as in Example 2 except that 0.1% by weight of a basic dye (manufactured by Hodogaya Chemical Industry Co., Ltd.) was used.

A discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 6 Kayanol Red NBR (Nippon Kayaku) was used as a water-soluble dye.
A white moisture detecting label was produced in the same manner as in Example 2 except that 0.1% by weight of an acidic dye (manufactured by Co., Ltd.) was used.

A discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 7 A white moisture detection label was prepared in the same manner as in Example 2 except that 0.1% by weight of direct dye of Kayanol Light Red F5B (manufactured by Nippon Kayaku Co., Ltd.) was used as the water-soluble dye. Was manufactured.

The discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 8 Sumifix Brilliant Red G as water-soluble dye
A white moisture detecting label was produced in the same manner as in Example 2 except that 0.1% by weight of a special dye (manufactured by Sumitomo Chemical Co., Ltd.) was used.

The discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 9 A commercially available ink medium (PAS-
A white moisture detection label was produced in the same manner as in Example 2 except that 69.9% by weight of 800 medium (manufactured by Jujo Chemical Co., Ltd.) was used.

The discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 10 A white moisture detecting label was produced in the same manner as in Example 2 except that 69.9% by weight of a commercially available ink medium (Tetron 900 Medium, manufactured by Jujo Chemical Co., Ltd.) was used as the ink vehicle. did.

The discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 11 A masking powder was prepared by dissolving 20% by weight of titanium oxide and 7% by weight of a resin of ethyl cellulose (Ethocel, manufactured by Dow Chemical Company) in 72.9% by weight of a xylene solvent as an ink vehicle. A white moisture detection label was produced in the same manner as in Example 2 except for this.

The discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 12 As a hiding powder, a solution prepared by dissolving 10% by weight of calcium carbonate and 8% by weight of a resin of ethyl cellulose (Ethocel: manufactured by Dow Chemical Co.) in 81.9% by weight of a solvent of xylene as an ink vehicle was used. A white moisture detection label was produced in the same manner as in Example 2 except for this.

The discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Example 13 A polyvinyl fluoride film (Tedlar: manufactured by DuPont, thickness 25 μm) was formed on the surface of the moisture detecting label produced in Example 2.
m) was dry-laminated to obtain a moisture detection label having a transparent waterproof layer.

The discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
When moisture was allowed to adhere from the back of the moisture detection label, the label was clearly discolored and displayed enlarged, and did not return to its original color even when dried. When moisture is attached from the surface, 1
It did not discolor even after standing for a week.

Comparative Example 1 Water was added dropwise to both sides of a filter paper (No. 4: manufactured by Advantech Toyo Co., Ltd.) in an amount of 0.01 ml to measure the change in color and the area of the discolored portion. 10
It was left to dry for a minute and observed for a change in color. Table 1 shows the results. As shown in the table, the discoloration was enlarged and displayed when moisture was attached to both surfaces, and immediately returned to the original color upon drying.

Comparative Example 2 As a water-soluble dye, Food Red No. 4 (San-ei Chemical Industry Co., Ltd.)
2% by weight, silicic acid (AEROSIL 38)
0: 98% by weight of Nippon Aerosil Co., Ltd.)
o. 4: Advantech Toyo Co., Ltd.) to produce a white moisture detection label.

On the back and front surfaces of the label, 0.01 ml of water was added dropwise to allow water to adhere to the label, and the color change and the area of the discolored portion were measured. After drying at 50 ° C. for 24 hours, the color change was observed. did. Table 1 shows the results. As shown in the table, when moisture was attached from the back surface of the moisture detection label, the discoloration was enlarged and displayed, and did not return to the original color even when dried. The discoloration was also magnified and displayed when moisture was allowed to adhere from the surface, and the dye did not return to the original color even when dried because the dye dyed the filter paper.

Comparative Example 3 Food Red No. 4 (San-ei Chemical Industry Co., Ltd.) as a water-soluble dye
6% by weight) and 9% by weight of a resin of ethyl cellulose (Ethocel: Dow Chemical Co., Ltd.) dissolved in 85% by weight of xylene solvent as an ink vehicle were kneaded with a grinder to obtain a color forming ink. Apply this ink to filter paper (N
o. 4: Advantech Toyo Co., Ltd.) was screen-printed to produce a red moisture detection label.

A discoloration test of this label was performed in the same manner as in Example 1, and the results are shown in Table 1. As shown in the table,
Discoloration could not be discriminated whether moisture was adhered from the back surface of the moisture detection label or from the front surface.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a moisture detection label to which the present invention is applied.

FIG. 2 is a sectional view showing another embodiment of the moisture detection label to which the present invention is applied.

FIG. 3 is a sectional view showing another embodiment of the moisture detection label to which the present invention is applied.

[Explanation of symbols]

1 is a water-permeable film, 2 is a coloring layer, 3 is a transparent waterproof layer, 4
Is an adhesive layer, and 5 is a release paper.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiromichi Mizusawa Ark Palace 405 4-28-35 Fujimi, Tsurugashima-shi, Saitama Ark Palace 405 (72) Daisuke Harumoto 3-11-7 Izumicho, Sakado-shi, Saitama Parkside City No. 206

Claims (3)

[Claims] 1. A water-permeable film having a color-forming layer provided on one side thereof, said color-forming layer comprising 0.001 to 5% by weight of a water-soluble dye and an ink vehicle, wherein said ink vehicle comprises a cellulose resin, an acrylic resin, or a polyester. Water, characterized in that at least one resin selected from among a resin, a polyamide resin, a silicone resin, a polyacetal resin, a polyurethane resin, an epoxy resin, and a petroleum resin is dissolved in a solvent. Detection label. 2. A water-permeable film having a color-forming layer provided on one side thereof, the color-forming layer comprising 0.001 to 5% by weight of a water-soluble dye and an ink vehicle, and a transparent waterproof layer provided on the surface. Moisture detection label. 3. The moisture detecting label according to claim 1, wherein the coloring layer contains 70% by weight or less of a concealing powder.