JP2003130862A - Underwater immersion time indicator - Google Patents

Abstract

(57) [Summary] An indicator that is used by being attached to a product that is immersed in water for a predetermined time, and that can easily and reliably confirm the immersion time visually by a change in color without measuring the immersion time in water. I will provide a. An underwater immersion time indicator includes an ink containing a water-soluble dye and a water-soluble dye-diffusible ink vehicle, or a discoloration layer made of a sheet containing a water indicator.
Is provided on the water-impermeable base material 12 and is covered with the water-soluble resin film 10. The indicator 1 can easily and accurately know that a predetermined time required for immersion has elapsed, and can be easily manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indicator which is used by being attached to a product which is immersed in water for a predetermined time and which allows the immersion time to be visually confirmed by a change in color tone.

[0002]

2. Description of the Related Art As a product used after being immersed in water for a predetermined time, there is, for example, Cement Capsule Q-Tight (trade name of NOF Giken Kogyo Co., Ltd.) which is a non-woven bag containing cement mortar. Cement capsules are used as an adhesive for post-installed anchors that connect the reinforced concrete skeleton and the wall materials attached to it, because water enters the cement capsules for a certain period of time and mixes with cement mortar at an appropriate ratio. . If the dipping time is shorter than the predetermined value, the water does not penetrate sufficiently and the ratio is not appropriate. If the dipping time is too long, the setting and hardening of the cement mortar starts in the water, and the post-installed anchor cannot be bonded in any case. Therefore, it is necessary to strictly measure the immersion time.

Conventionally, a stopwatch has been used to measure the immersion time. However, time measurement is troublesome.

[0004]

The present invention has been made to solve the above problems, and an object of the present invention is to provide an indicator that can be easily and reliably confirmed without measuring the immersion time in water. .

[0005]

DISCLOSURE OF THE INVENTION An underwater immersion time indicator 1 of the present invention made to achieve the above object comprises:
Referring to FIG. 1 corresponding to the embodiment, a color-changing layer 15 composed of an ink containing a water-soluble dye and a water-soluble dye-diffusing ink vehicle, or a moisture indicator-containing sheet.
Is attached to the water-impermeable substrate 12 and covered with the water-soluble resin film 10.

Water-soluble dyes contained in inks include food dyes, acid dyes, basic dyes, direct dyes, acid mordant dyes,
It is a fine powder such as a reactive dye. Discoloration layer 15
Is obtained by printing this ink on a water-impermeable substrate, for example. Indicator 1 having such a color change layer 15
When is immersed in water, the water-soluble resin film 10 begins to gradually elute from its surface, and elutes after a lapse of a predetermined time, and the discoloration layer 15 comes into contact with water. This water is the discoloration layer 15
Since the water-soluble dye therein is dissolved and diffused into the ink vehicle, the discoloration layer 15 is discolored. As a result, a change in the color tone of the indicator 1 is observed, and it can be confirmed that a predetermined immersion time in water has elapsed.

Examples of the water-indicator-containing sheet include a sheet containing an acid-base indicator and an acidic substance or a basic substance, or a sheet printed with a water-soluble ink. More specifically, it reversibly discolors with water. A quick dry book (trade name of Mishima Paper Co., Ltd.) is available. Even when the indicator 1 having the color-changing layer 15 made of this sheet is immersed, the water in contact with the color-changing layer 15 changes the color of the moisture indicator, and the color tone of the indicator 1 also changes.

The water-soluble resin film 10 is preferably made of polyvinyl alcohol, partially saponified polyvinyl acetate, or a copolymer of vinyl alcohol and vinyl acetate.

The water-soluble resin film 10 has a thickness of 25 to 6
It is preferably 00 μm. Water-soluble resin film 1
The time until 0 is completely dissolved in water and the color-changing layer 15 changes color is proportional to the thickness of the film 10. If the thickness is less than 25 μm, the water-soluble resin film is completely eluted immediately after the indicator is immersed in water, the discoloration layer is discolored, and the immersion time cannot be confirmed. On the other hand, if it is thicker than 600 μm, the elution rate of the water-soluble resin film varies, and the time until the elution is exhausted becomes uneven, so that the display of the immersion time becomes inaccurate. More preferably, this thickness is 60 to 300 μm.

As shown in FIG. 2, the indicator 1 includes a water absorbing layer 1 between the discoloration layer 15 and the water-soluble resin film 10.
6 may be provided. The water-absorbing layer 16 has a sufficient strength even after the water is soaked into it promptly, and examples thereof include non-woven fabric and paper. Among the papers, the water absorbing layer 16 is preferably made of Japanese paper which has good diffusibility of dissolved water-soluble dyes and the like and is translucent with water so that the discoloration layer 15 can be observed. A water-soluble dye-containing ink is printed on the water absorbing layer 16 to change the color.
5 may be formed, and the water-absorbing layer 16 may be overlaid with a moisture indicator-containing sheet to form the discoloration layer 15.

When the water-soluble resin film 10 is completely dissolved by immersing the indicator 1, water permeates the water absorbing layer 16 and wets the discoloration layer 15. This water dissolves, for example, the water-soluble dye in the color-changing layer 15 and diffuses in the water-absorbing layer 16, and the water-absorbing layer 16 is colored. As a result, the change in the color tone of the indicator 1 can be observed more clearly.

As shown in FIG. 1 or 2, the water-impermeable substrate 12 may have adhesive layers 11 and 13 on both sides. A release paper 14 may be attached to the adhesive layer 13 on the back surface side of the water-impermeable substrate 12.

As the non-permeable substrate 12, a polyethylene film, a polypropylene film or a polyethylene terephthalate film is used.

The submersion time indicator 1 is used by being attached to a product immersed in water, and can accurately indicate the submersion time of this product.

[0015]

EXAMPLES Examples of the water immersion time indicator of the present invention will be described in detail below.

FIG. 2 is a sectional view of the water immersion time indicator 1.

In the water immersion time indicator 1, a discoloration layer 15 formed by printing a water-soluble dye-containing ink on one surface of a water absorbing layer 16 made of Japanese paper has a part of the adhesive layer 11 on the water impermeable substrate 12. The water-absorbent layer 16 is covered with the water-soluble resin film 10, and the water-impermeable base material 12 and the water-soluble resin film 10 are bonded and integrated by the adhesive layer 11.

The water immersion time indicator 1 is manufactured as follows.

First, a water-soluble dye-containing ink is prepared.
In an organic solvent in which the water-soluble dye does not dissolve, the ink vehicle resin is dissolved into an ink vehicle, and the water-soluble dye is added to this, and the mixture is dispersed and kneaded by a ball mill, three rolls, a stirrer, a kairai machine, or a disperser A water-soluble dye-containing ink is obtained.

Water-soluble dyes are food red No. 2 and food red 3
No. 4, food red No. 4, food red No. 102, food red No. 103
No. 1, Food Red No. 104, Food Red No. 105, Food Red No. 1
No. 06, food blue No. 1, food blue No. 2; kayanol red NBR, brilliant scarlet 3B, acid fast orange SG, amaranth, acid rhodamine B, eosin G, acid milling red RS, alizarin direct blue. AG
G, indigo carmine blue G, acid dyes exemplified by Acid Milling Cyanine 5R; Cation Red 6
B, cation pink FG, crystal violet,
Basic dyes exemplified by methylene blue B; Kayanol Light Red F5B, Direct Fast Scarlet 4BS, Benzo Purpurin 4B, Direct Fast Orange S, Direct Rogerin Red B,
Cloran Ranch Fast Red 6BLL, Syria Thread
4B, Serious Supra Red Violet RL, Serious Supra Violet BL, Direct Sky Blue 5B Direct Dyes; Chrome Orange A, Chrome Orange GR, Chrome Red B, Chrome Brilliant Red B, Chrome Brilliant Violet R,
Acid mordant dyes exemplified by Chrome Brown PG; at least one kind of reactive dyes exemplified by Reacton Red 2B-F, Procion Rubin BS, Cibacron Violet F2R-A, and Procion Brilliant Blue RS is used.

Organic solvents include aromatic hydrocarbons exemplified by diethylbenzene, benzene, toluene and xylene; saturated hydrocarbons exemplified by hexane, cyclohexane and octane; ketones exemplified by acetone, methylethylketone and cyclohexanone; At least one of halogenated hydrocarbons exemplified by chloroform and trichloroethane; mineral spirits and petroleum-based solvents exemplified by petroleum ether is used.

Resins for ink vehicles include polyester resins, acrylic resins, polyamide resins, polyacetal resins, polyurethane resins, epoxy resins, petroleum resins, polyvinyl chloride resins, ketone resins, and cellulose resins. At least one selected from the above is used.

The ink is a concealing powder, a color tone adjusting agent,
It may contain additives such as a filler, a thickener, a dispersant, a stabilizer, and an antioxidant.

Next, the thickness of the water absorbing layer 16 is 30 to 70 g.
/ M^TwoPreferably 30-40 g / m ^TwoPiece of Japanese paper
This ink can be printed, applied, sprayed or coated on the surface
Then, the discoloration layer 15 is formed. Of the water-impermeable substrate 12
An adhesive is applied on one surface to form the adhesive layer 11. Water absorption layer
The color change layer 15 attached to 16 is attached to a part of the adhesive layer 11.
paste. With the water-soluble resin film 10, the water absorbing layer 16 is formed.
While covering, the adhesive layer 11 does not penetrate the water-soluble resin film 10.
At the time of immersion in water by pasting together with the water-based substrate 12
Get the interim indicator 1. The back surface of the water impermeable base material 12 is
Apply adhesive to form another adhesive layer 13 and attach release paper 14
You may.

In the following, Examples 1 to 7 in which an underwater immersion time indicator to which the present invention is applied are made as prototypes are shown, and Examples in which an indicator to which the present invention is not applied are made as prototypes are shown in Comparative Examples 1 to 3.

Example 1 9 parts by weight of ethyl cellulose (trade name of Ethocel: a product of Dow Chemical Co., Ltd.) was dissolved in 90 parts by weight of diethylbenzene, and a water-soluble dye, Food Blue No. 1 (manufactured by Sanei Chemical Industry Co., Ltd.). ) Company)
An ink was prepared by adding 1 part by weight and kneading with a ladle machine. This ink was screen-printed on one side of a water-absorbing layer of 30 g / m ² of Japanese paper. Adhesive Scotch VHB 9460 (trade name of Sumitomo 3M Limited)
Is a non-water-permeable base material, Super Stick PET25
The adhesive layer 11 was formed by coating on one side (trade name of Lintec Co., Ltd.). Japanese paper 16 was attached to the adhesive layer 11. A water-soluble resin film 10, Hiceron C-700 (trade name, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) having a thickness of 60 μm was attached so as to cover the Washi paper 16 to obtain an immersion time indicator 1 in water.

(Examples 2 to 5) The thickness of Hi-Selon C-700, which is a water-soluble resin film, was 120 μm and 180 μm.
The immersion time indicators in Examples 2 to 5 were obtained in the same manner as in Example 1, except that the indicators were changed to μm, 240 μm, and 300 μm, respectively.

(Example 6) A submersion time indicator in water was obtained in the same manner as in Example 1 except that a quick dry book red (trade name of Mishima Paper Co., Ltd.) was used instead of the water-soluble resin film. Obtained.

(Example 7) As a water-soluble resin film,
An underwater immersion time indicator was obtained in the same manner as in Example 1 except that Hiceron S-400 (trade name, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) having a thickness of 60 μm was used.

Comparative Example 1 As a water-soluble resin film,
An immersion time indicator in water was obtained in the same manner as in Example 1 except that Hiceron M-250 (trade name, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) having a thickness of 22 μm was used.

(Comparative Example 2) Edible red 4 which is a water-soluble dye
No. 1 (manufactured by Sanei Chemical Industry Co., Ltd.) and an ink vehicle in which 9% by weight of a resin of ethyl cellulose (Ethocel: manufactured by Dow Chemical Co., Ltd.) is dissolved in 90% by weight of xylene. Was prepared. Filter this (N
o. 4: Screen-printed on Advantech Toyo Co., Ltd.) to obtain an indicator capable of detecting water that has permeated the filter paper.

Comparative Example 3 The ink prepared in Example 1 was screen-printed on synthetic paper Yupotak (trade name, manufactured by Dainippon Ink and Chemicals, Inc.) to obtain an indicator.

When the water immersion time indicators of Examples 1 to 7 and the indicator of Comparative Example 1 were immersed in water at a water temperature of 20 ° C., the time until the discoloration of the indicators was observed was measured. Further, the discoloration time when the water immersion time indicator of Example 2 was immersed in water having a water temperature of 5 ° C and 30 ° C was also measured. The results are shown in Table 1.

[0034]

[Table 1]

As is clear from Table 1, the water immersion time indicators of Examples 1 to 7 changed to a distinct blue color or the like after a predetermined time elapsed after immersion. Like the indicators of Examples 1 to 5, the discoloration time at the same water temperature increased in proportion to the thickness of the water-soluble resin film. Further, the discoloration time of the indicator of Example 2 under different water temperatures was shorter as the water temperature was higher. The indicator of Comparative Example 1 was instantly discolored because the water-soluble resin film was too thin.

Next, using the water immersion time indicator of Example 2 and the indicators of Comparative Examples 2 and 3, a dew condensation test, a water drop test and an underwater immersion test were performed to observe the presence or absence of discoloration. The results are shown in Table 2.

[0037]

[Table 2]

As is clear from Table 2, the water immersion time indicator of Example 2 does not discolor until 5 minutes have passed after immersion, whereas the indicators of Comparative Examples 2 and 3 show a degree of dew condensation or water dripping. Discolored with a little water.

[0039]

As described above in detail, the submersion time indicator of the present invention changes the color tone rapidly and clearly after a predetermined time has elapsed after the submersion. It can be confirmed by visual inspection. By dipping this indicator in water and then pasting it on the product to be used and immersing it, it can be easily and accurately known that the predetermined time required for dipping this product has elapsed. This indicator can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an underwater immersion time indicator to which the present invention is applied.

FIG. 2 is a cross-sectional view showing another embodiment of an underwater immersion time indicator to which the present invention is applied.

[Explanation of symbols]

1 is an immersion time indicator in water, 10 is a water-soluble resin film, 11 is an adhesive layer, 12 is a water-impermeable substrate, 13 is an adhesive layer, 14 is release paper, 15 is a discoloring layer, and 16 is a water absorbing layer.

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Claims (4)

[Claims] 1. A color-changing layer comprising an ink containing a water-soluble dye and a water-soluble dye-diffusing ink vehicle, or a moisture indicator-containing sheet is applied onto a water-impermeable substrate,
An immersion time indicator in water characterized by being covered with a water-soluble resin film. 2. The water immersion time indicator according to claim 1, wherein the water-soluble resin film is made of polyvinyl alcohol, partially saponified polyvinyl acetate, or a copolymer of vinyl alcohol and vinyl acetate. . 3. The water-soluble resin film has a thickness of 25 to
The immersion time indicator in water according to claim 1, wherein the indicator is 600 μm. 4. The water immersion time indicator according to claim 1, wherein a water absorption layer is provided between the discoloration layer and the water-soluble resin film.