JP2001255277A - Detection liquid of defect part of waterproof sheet and its detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a detection liquid capable of detecting, simply and surely, a defect part such as a pin hole part and a surface flaw caused on a waterproof sheet after execution or at periodic inspection, when water proofing is executed by using the waterproof sheet, and a detection method of the defect part. SOLUTION: This detection liquid 2 for detecting the defect part of the waterproof sheet when water proofing is executed by using the waterproof sheet 1 comprising a thermoplastic resin or rubber includes luminescent material and also includes either or both of an aquatic resin and a surfactant. The detection liquid is applied on the surface of the waterproof sheet and removed, and thereafter light is radiated onto the waterproof sheet or the detection liquid, and the existence of reflected light is observed. If the defect parts 5 exist, the detection liquid 21, 22 remains to thereby enable to confirm or detect the existence of the defect part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection liquid and a defective liquid which can easily detect a defective portion such as a pinhole portion or a surface flaw of the waterproof sheet when waterproofing is performed using the waterproof sheet. The detection method of

[0002]

2. Description of the Related Art In general, a waterproof sheet is formed by using a fixed-size sheet, and the side edges of adjacent sheets are overlapped with each other and joined by heat fusion or solvent welding to form a waterproof layer. Such a waterproof layer leads to a defect that water leaks due to pinholes generated during construction or during use after construction.

Conventionally, as a method of detecting a pinhole of a waterproof sheet, a method of checking the air hole using a pressure reducer and a method of applying a voltage to the waterproof sheet and checking the pin hole by a discharge current are known. . However, in the method using the decompressor, the area that can be detected at one time depends on the size of the decompression container, and therefore, the inspection of the entire construction site requires a great deal of labor and time. Further, in the method using the discharge current, the condition is that the base material is a conductor and the surface of the waterproof sheet is also in a dry state, so that the method is used only in limited situations.

Further, a method of visually confirming the destruction of the waterproof sheet itself has been proposed.
No. 499 discloses that a signal layer containing a light reflector or a phosphor is laminated on the surface of a water-impermeable waterproof sheet, and when the waterproof sheet is broken, detection is performed by utilizing a difference in luminance of the portion with respect to visible light. It is shown to be. However,
This publication does not disclose a method for detecting a defective portion of a waterproof sheet.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a waterproofing treatment using a waterproofing sheet made of a thermoplastic resin or rubber, and to prevent pinholes and surface flaws formed on the waterproofing sheet after construction and during periodic inspection. An object of the present invention is to provide a detection liquid capable of easily and reliably detecting a defective portion when there is a defective portion, and a method of detecting the defective portion.

[0006]

In order to solve the above-mentioned problems, the present invention takes measures to detect a defective portion of a waterproof sheet when waterproofing is performed using a waterproof sheet made of a thermoplastic resin or rubber. Liquid containing a luminescent substance. It further contains an aqueous resin, and further contains a surfactant. Then, the detection liquid is applied to the surface of the waterproof sheet, and after removing the liquid, the waterproof sheet or the remaining detection liquid is irradiated with light, and the reflected light is observed.

When waterproofing is performed using a waterproof sheet made of a thermoplastic resin or rubber by the above means, a detection liquid containing a luminescent substance is applied to the surface of the waterproof sheet after construction and at the time of periodic inspection, and the liquid is scraped off. After removing with a luminous substance and an aqueous resin, the detection liquid containing the luminescent substance and the aqueous resin is applied to the surface of the waterproof sheet, and after forming the coating, the coating is peeled off and removed. By irradiating the substance with light, the reflection of the luminescent substance can be observed as a defect, and the defect can be easily detected and detected. It should be noted that “light” as used herein includes visible light, infrared light, and ultraviolet light.

[0008]

Next, the present invention will be described in more detail with reference to preferred embodiments. Examples of the thermoplastic resin used for the waterproof sheet in the present invention include, for example, vinyl chloride resin, ethylene / vinyl acetate copolymer, ethylene / acryl copolymer, olefin resin, chlorinated polyolefin, acrylic resin, thermoplastic resin Elastomers (olefin-based, polyester-based, urethane-based, etc.) and the like can be mentioned. On the other hand, the rubber used for the waterproof sheet in the present invention includes synthetic rubber and natural rubber.
R, NBR, chlorsulfonated polyethylene, EP
R, EPDM, chloroprene, neoprene (registered trademark), butadiene and the like.

The light-emitting substance applied to the detection liquid of the present invention includes a fluorescent whitening agent, a fluorescent substance, a luminous substance and the like. Examples of the fluorescent whitening agent include diaminostilbenzylsulfonic acid derivatives, bisstyrylbiphenyl derivatives, coumarin derivatives, pyrazolone derivatives, bisbenzaxazole derivatives, and naphthalimide derivatives. Examples of the fluorescent substance include an organic substance and an inorganic substance which themselves have fluorescence, and a fluorescent pigment in which a fluorescent dye is uniformly dissolved in an acrylic resin, a melamine resin, or the like. Examples of the phosphorescent substance include calcium sulfide, zinc sulfide, and zinc cadmium sulfide.

The amount of the luminescent substance to be added is preferably 0.01 to 20 parts by weight based on 100 parts by weight of water. Defects such as pinholes and scratches can be confirmed by adding less than 0.01 part by weight. However, in order to obtain a luminous effect and easily and reliably detect a defect such as pinholes and scratches, 0% by weight. Addition of at least 0.01 part by weight is preferred. However, the luminous effect is sufficient if added up to 20 parts by weight, and adding more than 20 parts by weight undesirably leads to an increase in cost.

The aqueous resin to be added to the detection liquid of the present invention is preferably a water-soluble resin such as polyvinyl alcohol and polyethylene oxide. Emulsion type such as acrylic resin, urethane resin and ethylene / vinyl acetate copolymer, SBR, NBR Latex type can also be used. A mixture of two or more of these may be used. In the case of the detection liquid containing this water-based resin, it is applied and then dried to form a film. A water-soluble organic solvent such as ethyl alcohol may be added to the aqueous resin in order to accelerate drying of the film. Further, it is preferable that the aqueous resin has transparency in order to enhance the detectability of the luminescent substance.

The content of the water-soluble resin which can be formed into a film and which can be peeled off is preferably 1 to 40 parts by weight with respect to 100 parts by weight of water. Although the film can be formed with less than 1 part by weight, the amount is preferably 1 part by weight or more for easily and surely forming the film. However, the content is sufficient at 40 parts by weight, and even if it exceeds this, the thickness of the film is increased and the cost is increased, which is not preferable.

By adding a surfactant to the detection liquid containing the luminescent substance, the wettability of the detection liquid to the waterproof sheet,
The extensibility is improved, and the permeability and adhesion to defective portions such as pinholes can be increased, and the detectability can be improved.
The surfactants include anionic, cationic and nonionic surfactants, and these can be used alone or in combination. Examples of anionics include carboxylate, sulfonate, sulfate, and phosphate, and nonionics include ether, ether ester, ester, and nitrogen-containing. Examples thereof include aliphatic quaternary ammonium type and benzalkonium type.

The addition amount of the surfactant is preferably 0.1 to 10 parts by weight based on 100 parts by weight of water. Even if the addition is less than 0.1 part by weight, the detection liquid enters a defective portion such as a pinhole, but the addition of 0.1 part by weight or more is preferable in order to easily and surely penetrate the pinhole. However, the effect is sufficient if the addition is up to 10 parts by weight, and the addition exceeding this amount undesirably leads to an increase in cost.

When a detection liquid containing a luminescent substance or a detection liquid containing a luminescent substance and further containing one or both of an aqueous resin and a surfactant is applied to the surface of the waterproof sheet, a brush,
It can be applied by a tampo, spray or the like.

As a method for removing the applied detection liquid, it is preferable to use a flexible material made of rubber or foam, but the present invention is not limited thereto. Anything that can be scraped off without scratching can be used,
The means is also optional.

In the case of a detection liquid containing an aqueous resin, after coating, drying, and forming a film, the film is peeled off by hand, or the film is removed by peeling off the film with an adhesive roll or the like to form a pinhole. Remove all but adhered.

Next, the state of the present invention from which the detection liquid is removed will be described with reference to the drawings. FIG. FIG. 2 is a cross-sectional view showing a state in which the detection liquid 2 is applied to the waterproof sheet 1 and the formed coating film 4 is peeled and removed. In any state, the waterproof sheet 1 has defects such as pinholes. When the defective portion 5 exists, the luminescent substance-containing detection liquid 21 or the detection liquid 22 containing the luminescent substance and the aqueous resin remains in the defective portion 5. 2 is removed and does not remain.

Therefore, if the waterproof sheet 1 has a defective portion 5 such as a pinhole or a scratch, the detection liquid 21 or 22 remains in the defective portion 5, so that the detection liquid 21 remaining on the waterproof sheet 1 or Or, by irradiating light to 22, it is possible to visually observe the reflection of the contained luminescent substance, and it is possible to easily find a defective portion such as a pinhole, and when there is no defective portion, the detection liquid is Since there is no residue, it is clear that there is no reflection of the luminescent substance and there is no defect, and it is possible to confirm the presence or absence of the defect.

[0020]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Examples 1 and 2 and Comparative Example 1 The compositions of the detection liquids used in Examples and Comparative Examples were as shown in Table 1. The detection liquid prepared with the composition shown in Table 1 was applied to the surface of the waterproof sheet with a brush, scraped off with a rubber-like instrument, irradiated with black light, and the detectability was visually checked. Table 1 shows the evaluation results.

[0022]

[Table 1]

The composition shown in Table 1 is as follows.・ Luminescent substance: Fluorescent whitening agent (Ubitex OB manufactured by Ciba Geigy) ・ Surfactant: Sodium salt of alkylbenzene sulfonic acid (Nippon Oil & Fats Co., Ltd.) ・ Evaluation criteria ◎: Pinhole (defect part) contains luminescent substance The detection liquid enters and can be easily confirmed visually. ：: The detection liquid containing the luminescent substance remains in the pinhole (defect portion) and can be visually confirmed. ×: It is difficult to confirm pinholes (defects).

Examples 3 and 4 and Comparative Example 2 The compositions of the detection liquids used in Examples and Comparative Examples were as shown in Table 2. A detection liquid containing a luminescent substance prepared according to the formulation shown in Table 2 and further containing an aqueous resin is applied to the surface of the waterproof sheet with a brush, and after the film is formed, the film is peeled off and irradiated with black light. Was visually confirmed. Table 2 shows the evaluation results.

[0025]

[Table 2]

The formulations shown in Table 2 are as follows.・ Luminescent substance: Fluorescent pigment (Shinloich color manufactured by Shinloich) ・ Water-soluble resin: Polyvinyl alcohol resin ・ Surfactant: Alkyl phosphate (manufactured by Asahi Denka Kogyo) ・ Evaluation criteria ◎: Pinhole (defect part) A coating of an aqueous resin containing a luminescent substance adheres to the surface and can be easily confirmed visually. ：: An aqueous resin film containing a luminescent substance remains in the pinholes (defects) and can be visually confirmed. ×: It is difficult to confirm pinholes (defects).

[0027]

According to the present invention, when a waterproofing treatment is performed using a waterproofing sheet made of a thermoplastic resin or rubber, the detecting liquid for detecting a defective portion of the waterproofing sheet contains a luminescent substance. When the liquid is applied to the surface of the waterproof sheet, if the waterproof sheet has a defective portion such as a pinhole or a scratch, the detection liquid remains on the defective portion even after the detection liquid is removed, and the defective liquid remains on the surface of the waterproof sheet. By irradiating the remaining detection liquid with light, the reflected portion of the luminescent substance can be visually observed, and a defective portion such as a pinhole can be easily found.

When a waterproofing treatment is performed using a waterproofing sheet made of a thermoplastic resin or rubber, the liquid is a detection liquid for detecting a defective portion of the waterproofing sheet, and contains a luminescent substance and an aqueous resin. By applying the detection liquid to the surface of the waterproof sheet, a coating can be easily and reliably formed, and by removing the coating, if the waterproof sheet has a defect, the coating is removed. Since the detection liquid remains on the defective portion even after peeling / removing, by irradiating light in the same manner as described above, the reflected portion can be visually observed and observed,
A defective portion such as a pinhole can be easily found.

Further, when a surfactant is added to the above-mentioned detection liquid to apply the detection liquid to the surface of the waterproof sheet, the wettability and spreadability of the detection liquid to the waterproof sheet are improved. In the case where there is a defective portion, it is easy to enter the defective portion, the permeability and adhesion are enhanced, the defective portion can be found easily and reliably, and the detectability can be improved.

The present invention also relates to a method for detecting a defective portion of a waterproof sheet when waterproofing is performed using a waterproof sheet made of a thermoplastic resin or rubber. After removing this, irradiate the surface of the waterproof sheet or the remaining detection liquid with light and observe the reflected light.If the waterproof sheet has a defect such as a pinhole or a scratch, Since the detection liquid remains in the defective portion and the luminescent material is reflected, the presence or absence of the defective portion can be easily found.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view in which a detection liquid containing a luminescent substance is scraped off.

FIG. 2 is a cross-sectional view in which a film of a detection liquid containing a luminescent substance and an aqueous resin is peeled off.

[Explanation of symbols]

1: Waterproof sheet, 2: Detection liquid, 21 and 22: Residual detection liquid, 3: Scratching instrument, 4: Peeled coating, 5: Defect part.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G051 GA10 GB02 4D075 BB41Z CA47 CA50 DA04 DB32 DC01 DC05 EA05 EC11 EC35

Claims (4)

[Claims] 1. A detection liquid for detecting a defective portion of a waterproof sheet when a waterproof treatment is performed using a waterproof sheet made of a thermoplastic resin or rubber, wherein the detection liquid contains a luminescent substance. . 2. A detection liquid for detecting a defective portion of a waterproof sheet when waterproofing is performed using a waterproof sheet made of a thermoplastic resin or rubber, wherein the detection liquid contains an aqueous resin. Item 6. The detection liquid according to Item 1. 3. A detection liquid for detecting a defective portion of a waterproof sheet when waterproofing is performed using a waterproof sheet made of a thermoplastic resin or rubber, wherein the detection liquid contains a surfactant. The detection liquid according to claim 1 or 2. 4. A method for detecting a defective portion of a waterproof sheet when waterproofing is performed using a waterproof sheet made of a thermoplastic resin or rubber, wherein the detection liquid according to claim 1 is used. After applying to the surface of the waterproof sheet and removing it,
A detection method characterized by irradiating light to a waterproof sheet or remaining detection liquid and observing reflected light.