JP2007039573A - Uncured resin-impregnated sheet for protection of structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an uncured resin-impregnated sheet for protection of a structure, enabling the temporal adhesive state of the sheet to the structure to be visually checked, and enabling the whole sheet to be cured uniformly without unevenness. <P>SOLUTION: The sheet 1A is obtained by impregnating a glass base material 10 allowing visible light to penetrate the base material with a visual light-curable resin containing a light-gathering fluorescent dye. The glass base material 10 has a three-layered laminated structure obtained by arranging glass cloths 12 on both outsides of a glass mat 11. The whole outside of the sheet 1A is covered with a protection film 20 and a shading film 21. When the sheet 1A after being attached to the concrete wall of a construction is irradiated with a black light, the whole of the sheet 1A emits the light to allow the temporal adhesive state of the sheet 1A to the concrete wall to be visually checked accurately. The light-gathering fluorescent dye emits the light at the irradiation with the visible light to cure the whole sheet 1A uniformly. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This invention relates to anti-corrosion, waterproofing, repair and reinforcement of sewerage related facilities (for example, sewer manholes), repair and reinforcement of civil engineering buildings (for example, tunnels), reinforcement of pipes, chimneys and road facilities, concrete structures and PVC products. -It relates to an uncured resin-impregnated sheet for protecting structures used for repair and reinforcement of metal products.

  For example, a concrete wall of a sewer manhole is covered with a sheet for the purpose of anticorrosion and waterproofing. As this type of sheet, a thermosetting, ultraviolet curable, or visible light curable transparent or translucent sheet is used.

On the other hand, an accident caused by a sudden drop of a concrete piece stuck to a part where a concrete piece may suddenly fall from a cold joint or a slight crack occurrence part of a concrete structure such as a tunnel or a road bridge. In order to prevent this, the tension type concrete piece fall prevention which consists of a translucent sheet which laminated a translucent nonwoven fabric, a translucent glass fiber mat, and a net, and was attached with a transparent or translucent visible light curable resin. There is a sheet (see, for example, Patent Document 1).
Japanese Patent No. 3598256

  When the above conventional sheet is scratched or when whitening or discoloration occurs due to chemical changes over time in the resin used, it is difficult to visually confirm such defects from the sheet. For this reason, it is impossible to confirm the contact state of the sheet over time. Therefore, in order to improve the inspection accuracy, there is a problem that requires cost and time, such as removing a part of the sheet after the construction and inspecting, and then performing the construction again.

  In addition, the conventional UV curable or visible light curable sheet has a curing mechanism in which the curing reaction stops when the irradiation of light necessary for curing is interrupted due to the curing mechanism of the resin. .

  On the other hand, the sheet described in Patent Document 1 is transparent or semi-transparent as a whole so that the presence or absence of cracks leading to the fall of the concrete pieces and the progress of the progress can be confirmed directly with eyes. Not only is the net required to catch a fallen piece of concrete as an essential component, but it is not glued to a concrete wall of a sewer manhole, even if it is applied to a concrete wall of a sewer manhole. Because of the characteristics resulting from the difference in use, it is difficult to visually confirm the time-dependent adhesion state of the sheet from the sheet. Moreover, Patent Document 1 does not describe the problem of poor curing at all and does not suggest countermeasures.

  The present invention has been made paying attention to such problems, and can accurately recognize the time-dependent adhesion state of the sheet to the structure, and uniformly cure the entire sheet without unevenness. An object of the present invention is to provide an uncured resin-impregnated sheet for protecting a structure.

  In order to solve the above-mentioned problems, the uncured resin-impregnated sheet for protecting structures according to the present invention is characterized in that a visible light curable resin containing a fluorescent material is impregnated into a glass substrate that transmits visible light. Yes.

  This sheet is uncured (A stage prepreg sheet) until it is irradiated with visible light, but it is cured by applying visible light after pressure bonding to the wall of the structure, and the installation work on the structure is completed. To do. After that, if the sheet is irradiated with black light (long wavelength ultraviolet light having a main wavelength of 365 nm), the fluorescent material dispersed throughout the sheet emits light, so that the adhesive state of the sheet over time can be accurately recognized.

  In this sheet, the fluorescent material is preferably a condensing fluorescent dye. Although it is not specified as this condensing fluorescent dye, naphthalimide is particularly preferable. Further, it is preferable that the condensing fluorescent dye is dissolved in a solvent and then mixed in the visible light curable resin. In addition to the light-collecting fluorescent dye, a fluorescent pigment may be used.

  In addition, the glass substrate is preferably formed by laminating a glass mat and a glass cloth. In this case, the glass substrate preferably has a laminated structure in which glass cloth is disposed on both outer sides of the glass mat.

  In the present invention, structures protected by sheets include sewer related facilities (for example, sewer manholes), civil engineering buildings (for example, tunnels), piping, chimneys, road facilities, concrete structures, PVC products, metal products, etc. The sheet of the present invention is used for anticorrosion, waterproofing, repair, reinforcement and the like of these structures.

  Visible light includes not only visible rays but also near infrared rays, and is approximately 380 to 1200 nm in the wavelength region.

  According to the present invention, when the black light is irradiated after the sheet is completely cured, the entire sheet emits light by the fluorescent material dispersed throughout the sheet, so that the time-dependent adhesion state of the sheet to the structure can be accurately visually confirmed. .

  In addition, since the fluorescent material is dispersed throughout the sheet, the fluorescent material generates light in the wavelength range necessary for curing the visible light curable resin when irradiated with visible light, so that light is also difficult to reach the visible light. As a result, it is possible to significantly reduce the number of poorly cured portions, to uniformly cure the entire sheet without unevenness, and to improve the construction reliability of the sheet.

  Furthermore, when the visible light curable resin contains a fluorescent material, it is possible to shorten the time until the sheet is cured by irradiation with visible light, compared to a case where the fluorescent material is not included.

  Hereinafter, the present invention will be described in more detail with reference to embodiments.

  A cross-sectional view of an uncured resin-impregnated sheet for protecting a structure according to one embodiment is shown in FIG. This sheet 1A is formed by impregnating a visible light curable resin containing a fluorescent material (light-collecting fluorescent dye) into a glass substrate 10 that transmits visible light. The glass substrate 10 has a three-layer laminated structure in which glass cloths 12 are arranged on both outer sides of the glass mat 11. The visible light curable resin containing the light-collecting fluorescent dye is obtained by dispersing an internal additive (light-collecting fluorescent dye) in a matrix (base material).

  This sheet 1 </ b> A is covered with a protective film 20 and a light shielding film 21 for improving the storage stability on the entire outside. The protective film 20 and the light shielding film 21 are laminated | stacked on the glass cloth 12 so that peeling is possible in order. Furthermore, the sheet 1A, the protective film 20 and the light shielding film 21 are hermetically packaged, for example, with an aluminum laminate film 22 that does not transmit visible light, and the aluminum laminate film 22 is opened when in use.

  A sectional view of an uncured resin-impregnated sheet for protecting structures according to another embodiment is shown in FIG. Similar to the sheet 1A, the sheet 1B is formed by impregnating a visible light curable resin containing a condensing fluorescent dye into a glass substrate 10 that transmits visible light. Here, the glass substrate 10 has a five-layer laminated structure in which the nonwoven fabric 13 is provided on both outer sides of the glass mat 11 and the glass cloth 12 is disposed on the outer side of each nonwoven fabric 12. The visible light curable resin containing the light-collecting fluorescent dye is as described above. Similarly, the sheet 1B is covered with the protective film 20 and the light-shielding film 21 and further entirely enclosed in the aluminum laminate film 22. .

  In addition, the glass mat 11, the glass cloth 12, and the nonwoven fabric 13 which comprise the glass base material 10 will not be specified if a visible ray is permeate | transmitted at the time of uncured resin impregnation. The visible light curable resin may be any resin that cures in the wavelength range of 380 to 1200 nm as described above. For example, a vinyl ester resin having curability at 430 to 1200 nm is preferable. In order to impregnate the glass substrate 10 with the visible light curable resin containing the condensing fluorescent dye, for example, the glass substrate 10 is immersed in a resin solution.

  The sheets 1A and 1B are used for waterproofing / corrosion-proofing, repairing / reinforcing the concrete wall of the sewer manhole 30, as shown in FIG. The sewer manhole 30 has, for example, a diameter φ = 900 mm, a horizontal hole 31 through which the pipe passes, and a recess 32 (FIG. 3B) in which the pipe is disposed at the bottom. The sheets 1A and 1B are attached to the side peripheral wall and the bottom wall of the sewer manhole 30.

  As an example of the construction method in this case, first, the aluminum laminate film 22 is opened, and the sheet 1A covered with the protective film 20 and the light shielding film 21 is taken out. The protective film 20 and the light shielding film 21 on one side of the sheet 1 </ b> A are peeled off, and the exposed glass cloth 12 side is pressure-bonded to the concrete wall of the sewer manhole 30. At this time, after applying a primer to the concrete wall as necessary, the sheet 1A is pressure-bonded.

  Next, a roller is pressed against the light-shielding film 21 and rolled to expel air bubbles existing between the sheet 1A (glass cloth 12) and the concrete wall. Thereafter, the light shielding film 21 is peeled off, and visible light is irradiated on the entire sheet 1 </ b> A from above the protective film 20. Thereby, the visible light curable resin impregnated in the whole glass substrate 10 (sheet 1A) starts hardening.

  As a light source for visible light, natural light (sunlight), a metal halide lamp for normal outdoor lighting, or the like is used. Depending on the conditions, in the case of natural light, the sheet 1A is completely cured in 10 minutes in direct sunlight, in 60 minutes in a cloudy sky, and in 10-15 minutes in the case of a metal halide lamp. After completion of the curing, the protective film 20 is removed to complete the construction of the sheet 1A.

  In this sheet 1A, since the condensing fluorescent dye is dispersed throughout, the condensing fluorescent dye emits light when irradiated with visible light, and as a result, the visible light is evenly irradiated onto the sheet 1A. Thereby, the whole sheet 1A is uniformly cured, and the construction reliability of the sheet 1A is also improved. Moreover, since the condensing fluorescent dye is contained in the visible light curable resin, it cures faster than when the condensing fluorescent dye is not included.

  According to this construction method, it is possible to perform a safe and simple operation by simply taking out the sheet 1A and performing pressure bonding, deaeration, and irradiation, and the total cost can be reduced. In addition, since natural light, outdoor lighting equipment, or the like is used as a visible light source, there is little danger to the human body when using ultraviolet light, and the selection of the light source is easy.

  After the construction, in order to confirm the temporal adhesion state of the sheet 1A to the concrete wall, the sheet 1A is irradiated with black light. Since the condensing fluorescent dye is dispersed throughout the sheet 1A, the entire area of the sheet 1A emits light by irradiation with black light, so that the contact state of the sheet 1A can be accurately visually confirmed. In addition, the concrete wall can be waterproofed / corroded by the sheet 1A. Of course, not only the concrete wall of the sewer manhole 30 but also the joint portion and the crack portion of the concrete structure can be prevented from leaking and deterioration due to corrosive gas such as hydrogen sulfide.

  Next, the significance of using a condensing fluorescent dye as the fluorescent material used in the uncured resin-impregnated sheets 1A and 1B for protecting structures according to the embodiment will be described. Depending on the thickness of the sheet, the light-collecting fluorescent dye is internally added to the visible light curable resin in an amount of 0.01 to 0.05%. For example, it is 0.02% when the thickness of the sheet is 3 mm. Taking naphthalimide particularly suitable as a light-collecting fluorescent dye as an example, the characteristics of naphthalimide are that the fluorescent color is purple, the shape is powder, the maximum absorption wavelength is 378 nm, the maximum excitation wavelength is 413 nm, and the heat resistant temperature is 300 ° C.

  Solvents for dissolving this naphthalimide include styrene monomer (30), benzyl alcohol (30), xylene (15), toluene (10), dimethylformamide (7) in the order of solubility [(g / l), 20 ° C.]. ), Acetone (5) and the like, and styrene monomer is particularly preferable.

The absorption and excitation spectra of naphthalimide are as shown in FIG. However, here, methylene chloride (CH ₂ Cl ₂ ) was used as a solvent.

  Such a condensing fluorescent dye such as naphthalimide has better transparency and curability of the sheet and visibility to the end of the sheet than the fluorescent pigment.

  In particular, naphthalimide is beautifully colored and has a high intensity of light emission (fluorescence) at the edge of the sheet. Therefore, when the sheet is irradiated with black light, it emits evenly and strongly light up to the edge of the sheet, and is very visible. . This is because when the sheet is irradiated with black light, the emitted light reaches the end while being totally reflected inside the sheet, and is condensed at the end. Moreover, since it is excellent in weather resistance, it is not only suitable for long-term outdoor use, but also has extremely high heat resistance, so it has good processability and high coloring power.

  Next, various characteristics when a fluorescent pigment is used as a fluorescent material used for the uncured resin-impregnated sheets 1A and 1B for protecting structures according to the embodiment will be described based on the quality test results. Below, the appearance, adhesion, acid resistance, alkali resistance, water permeability, and sulfur penetration depth are taken up as test items.

  The fluorescence distribution spectrum of the fluorescent pigment used is as shown in FIG. In FIG. 5, the energy of each color AJ when a black light is irradiated is shown. FIG. 6 shows a spectral energy distribution diagram of a visible light source.

  On the other hand, the specimen used for the appearance test (the object to which the sheet is attached) is vertical × horizontal × thickness = 500 × 500 × 100 mm. A sheet is attached to one side of the specimen, and this specimen is 3 Prepared body.

  The test body used for the adhesion test is made of cement concrete and has a length × width × thickness = 500 × 500 × 200 mm. A sheet was affixed to one side of the test body, and three test bodies were prepared.

  The specimen used for the acid resistance and alkali resistance (sulfur penetration depth) test has a prismatic shape as shown in FIG. The test body 40 is made of cement concrete and has a length × width × height = 100 × 100 × 200 mm. Sheets were affixed to six surfaces of the test body 40, and three test bodies 40 were prepared for the acid resistance and alkali resistance tests, and one was prepared for the sulfur penetration depth. In FIG. 7, reference numeral 41 denotes a joint portion of the sheet.

  Furthermore, the test body used for the water permeability test has a cylindrical shape as shown in FIG. The test body 50 is made of cement mortar and has a diameter × thickness = 150 × 60 mm. A sheet was attached to one surface of the test body 50, and three test bodies 50 were prepared.

  FIG. 8 shows a normal (sheet portion) water permeability test, but in FIG. 9, two sheets are attached to one surface of the same test body 50 so that the two sheets overlap at the joint portion 51. Three test bodies 50 were prepared. In this case, it becomes a water permeability test at the joint 51.

  Standards and test results for each test are as follows.

Test item Test result Test standard / Appearance test Cover wrinkles / unevenness / peeling / covering Cover wrinkles / unevenness / peeling /
Did not admit. There is nothing for me.
・ Stickness test 2.75MPa 0.24MPa or more ・ Acid resistance test Blistering, cracking, softening, and elution 60% sulfuric acid aqueous solution for 60 days
Did not admit. Even if it is immersed, it will bulge and cover the coating
・ No softening / elution.
・ Alkaline resistance Blowing, cracking, softening, and elution of the coating
Did not admit. Wipe the coating even after 60 days of immersion
No cracking, cracking, softening or elution
When.
・ Sulfur penetration depth The depth of penetration when immersed in a sulfuric acid aqueous solution with a penetration depth of 10% for 120 days (sheet part) for 1 μm or less for a design thickness of 3 mm.
1% or less of the total thickness
thing.

(Joint part) The penetration depth when immersed for 10 days in a sulfuric acid aqueous solution with a penetration depth of 10% for a design thickness of 3 mm (reference numeral 41) for 1 μm or less is set.
Less than 5% of the total thickness
And 100 μm or less
There is.
-Water permeability test Water permeability is 0.15g or less (sheet part) 0.00g
(Junction) 0.02g
(Reference numeral 51)
Furthermore, the relationship between the irradiation time of visible light and the Barcol hardness (BH) of the uncured resin-impregnated sheets 1A and 1B for protecting structures according to the embodiment is shown in FIG. “BH on the back surface” on the vertical axis in FIG. 10 means the Barcol hardness on the side opposite to the visible light irradiation side of the sheet used in the test.

In this hardness test, two types of sheets using glass mats 11 having a thickness of 3 mm and 10 mm were prepared. A metal halide lamp with an output of 2 kW was used as a visible light source. The irradiation distance of the lamp from the sheet is 1 m, the wavelength of the lamp is 380 to 450 nm, and the illuminance is 15 to 30 mW / cm ² .

  According to FIG. 10, it can be seen that the two types of sheets are both cured in about 5 minutes after the start of irradiation with visible light. In the above, in the case of a metal halide lamp, the curing is completed in 10 to 15 minutes, but this is because sufficient safety and reliability are anticipated.

It is sectional drawing of the uncured resin impregnation sheet | seat for structure protection which concerns on one Embodiment. It is sectional drawing of the uncured resin impregnation sheet | seat for structure protection which concerns on another embodiment. It is sectional drawing of the sewer manhole to which the uncured resin impregnation sheet | seat for the same structure protection is applied. It is a figure which shows the absorption and excitation spectrum of naphthalimide which is a condensing fluorescent dye as a fluorescent material used for the uncured resin impregnation sheet | seat for the same structure protection. It is a figure which shows the fluorescence distribution spectrum of the fluorescent pigment as a fluorescent material used for the uncured resin impregnation sheet | seat for the same structure protection. It is a spectral energy distribution figure of the light source of the visible light irradiated to the uncured resin impregnation sheet | seat for the same structure protection. It is a perspective view of the test body used for the acid resistance and alkali resistance (sulfur penetration depth) test of the uncured resin impregnated sheet for protecting the structure. It is the top view and side view of the test body which were used for the normal (sheet part) water permeability test of the uncured resin impregnation sheet | seat for the same structure protection. It is the top view and side view of the test body which were used for the water permeability test of the junction part of the uncured resin impregnation sheet | seat for the same structure protection. It is a figure which shows the relationship between the irradiation time of the visible light of the uncured resin impregnation sheet | seat for the same structure protection, and Barcol hardness (BH).

Explanation of symbols

1A, 1B Uncured resin-impregnated sheet for protecting structures 10 Glass base material 11 Glass mat 12 Glass cloth 13 Non-woven fabric 20 Protective film 21 Light-shielding film 22 Aluminum laminate film 30 Sewerage hole

Claims (6)

  An uncured resin-impregnated sheet for protecting a structure, wherein a glass substrate that transmits visible light is impregnated with a visible light curable resin containing a fluorescent material.   2. The uncured resin-impregnated sheet for protecting a structure according to claim 1, wherein the fluorescent material is a condensing fluorescent dye.   3. The uncured resin-impregnated sheet for protecting a structure according to claim 2, wherein the condensing fluorescent dye is dissolved in a solvent and then mixed with the visible light curable resin.   The uncured resin-impregnated sheet for protecting a structure according to claim 1, wherein the fluorescent material is a fluorescent pigment.   5. The uncured resin-impregnated sheet for protecting a structure according to claim 1, wherein the glass substrate is formed by laminating a glass mat and a glass cloth.   6. The uncured resin-impregnated sheet for protecting a structure according to claim 5, wherein the glass substrate has a laminated structure in which glass cloth is disposed on both outer sides of a glass mat.

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