Leakage location determination material and method, leakage location repair material and method, and leakage location repair device

Abstract

The present invention provides a material for determining a leak location, which is used to apply to a suspected leak location to determine the leak location. Among them, if the viscosity at 25°C when the shear rate is 0.1 s-1 is set as A (Pa·s), and the viscosity at 25°C when the shear rate is 10 s-1 is set as B (Pa·s), then the following formula is satisfied: A / B ≥ 21.0, and the elastic modulus E' at 50°C after curing is 10 MPa or more.

Description

Technical Field

[0001] The present invention relates to a material for determining a gas leakage part, a method for determining a gas leakage part, a material for repairing a gas leakage part, a method for repairing a gas leakage part, and a device for repairing a gas leakage part. Background Art

[0002] Conventional methods for repairing gas leakage parts require determining the gas leakage part and performing repair using welding or a gas leakage repair material composed of epoxy resin in a state where there is no gas leakage. On the other hand, in a state where gas is leaking, it is necessary to apply a pressure higher than the leakage pressure to press the resin coating part until the epoxy resin cures.

[0003] For example, in a method for repairing a gas leakage part of a gas-sealing device, a pipe through which gas flows, etc., the following method has been proposed: after determining the gas leakage part, a pressure applicator is used to apply a photocurable resin to the gas leakage part while pressing to temporarily stop the gas leakage, and the photocurable resin is cured in a pressed state (for example, refer to Patent Document 1).

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-89878 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] However, in the method described in Patent Document 1 above, it is necessary to determine the gas leakage part in advance. In addition, in the case of photocuring with a long wavelength, the curing takes time, so it is necessary to continuously press with a pressure applicator during the time until curing. Therefore, there are the following problems: if there is a part where the pressing is weak, gas leakage will occur again, and if the leakage pressure is high, repair cannot be performed.

[0009] The problem of the present invention is to solve the above-mentioned various problems in the past and achieve the following purposes. That is, the object of the present invention is to provide a material for determining a gas leakage part and a method for determining a gas leakage part that can easily determine the gas leakage part by a simple operation of only applying to a suspected gas leakage part, a material for repairing a gas leakage part and a method for repairing a gas leakage part that do not require prior determination of the gas leakage part and can be simply repaired in a short time even if the gas leakage amount from the gas leakage part is large, and a device for repairing a gas leakage part.

[0010] Means for Solving the Problems

[0011] As a means for solving the above problems, it is as follows. That is,

[0012] <1>A material for determining air leakage sites, characterized in that it is used to apply to suspected air leakage sites to determine the air leakage sites.

[0013] If the viscosity at 25°C when the shear rate is 0.1 s -1 is set as A (Pa·s), and the viscosity at 25°C when the shear rate is 10 s -1 is set as B (Pa·s), then the following formula is satisfied: A / B ≥ 21.0.

[0014] The elastic modulus E' at 50°C after curing is 10 MPa or more.

[0015] <2>The material for determining air leakage sites according to the above <1>, when the shear rate is 0.1 s -1 the viscosity A at 25°C is 500 Pa·s or more.

[0016] <3>The material for determining air leakage sites according to the above <1> or <2> contains a curable resin composition.

[0017] <4>The material for determining air leakage sites according to the above <3>, wherein the curable resin composition contains a polymerizable compound and / or a polymerization initiator.

[0018] <5>The material for determining air leakage sites according to the above <4> further contains a colorant.

[0019] <6>The material for determining air leakage sites according to any one of the above <1> to <5> is cured by irradiation with light having a wavelength of 420 nm or less.

[0020] <7>A material for repairing air leakage sites, characterized in that the material for determining air leakage sites according to any one of the above <1> to <6> is used for repairing air leakage sites.

[0021] <8>A method for determining air leakage sites, characterized by including: an air leakage site determination step of forming a coating film formed of the material for determining air leakage sites according to any one of the above <1> to <6> on a suspected air leakage site, and determining the site of the hole generated in the coating film due to the air leakage as the air leakage site.

[0022] <9>A method for repairing air leakage sites, characterized by including:

[0023] a curing step of curing the coating film including the air leakage site determined by the air leakage site determination method described in the above <8>; and

[0024] a repair step of using the material for repairing air leakage sites described in the above <7> to block the cured air leakage site and curing the material for repairing air leakage sites.

[0025] <10>A method for repairing a gas leakage site, characterized by comprising:

[0026] A step of curing the coated film while a tubular member is disposed at the gas leakage site of the coated film including the gas leakage site, the gas leakage site being determined by the gas leakage site determination method described in <8>; and

[0027] A step of, after filling the gas leakage site repair material described in <7> into the tubular member, connecting an opening / closing valve in an open state to the tubular member that has been opened due to the gas leakage pressure and closing the opening / closing valve.

[0028] <11>A gas leakage site repair device, characterized by having a light source and a film member or a strip member that allows ultraviolet rays to pass through the irradiation surface of the light source,

[0029] The gas leakage site repair material described in <7> can be assembled on the film member and the strip member.

[0030] <12>The gas leakage site repair device according to <11> above, wherein the surfaces of the film member and the strip member are subjected to a demolding treatment.

[0031] <13>A method for repairing a gas leakage site, characterized by using the gas leakage site repair device described in <11> or <12> above.

[0032] Advantages of the Invention

[0033] According to the present invention, the above-mentioned various problems in the prior art can be solved, the above-mentioned object can be achieved, and a gas leakage site determination material and a gas leakage site determination method that can easily determine the gas leakage site by a simple operation of only applying to a suspected gas leakage site, a gas leakage site repair material and a gas leakage site repair method that can simply repair in a short time without previously determining the gas leakage site and even when the gas leakage amount from the gas leakage site is large, and a gas leakage site repair device can be provided. Description of the Drawings

[0034] Figure 1 Figure 1 is a photograph showing an example of a gas pipe to be repaired for gas leakage.

[0035] Figure 2 Figure 2 is a photograph showing an example of the top surface of a closed flange portion of a gas pipe.

[0036] Figure 3 Figure 3 is a photograph showing an example of the bottom surface of a closed flange portion of a gas pipe.

[0037] ​​​​​​​Figure 4 Figure 4 This is a photograph showing an example of the state of the light irradiation surface side of the air leakage part repair device of the present invention.

[0038] Figure 5 Figure 5 This is a photograph showing an example of the state of the light source side of the air leakage part repair device of the present invention.

[0039] Figure 6 Figure 6 This shows an example of the air leakage part repair method of the first embodiment, and is a photograph showing the state before repair of the air leakage part.

[0040] Figure 7 Figure 7 This shows an example of the air leakage part repair method of the first embodiment, and is a photograph showing the state in which the air leakage part determination material is applied to the suspected air leakage part.

[0041] Figure 8 Figure 8 This shows an example of the air leakage part repair method of the first embodiment, and is a photograph showing the state in which a hole is formed in the coating film due to air leakage.

[0042] Figure 9 Figure 9 This shows an example of the air leakage part repair method of the first embodiment, and is a photograph showing the state in which the coating film including the air leakage part is cured.

[0043] Figure 10 Figure 10 This shows an example of the air leakage part repair method of the first embodiment, and is a photograph showing the state of the air leakage part after curing.

[0044] Figure 11 Figure 11 This shows an example of the air leakage part repair method of the first embodiment, and is a photograph showing the state in which the air leakage part is blocked with the air leakage part repair material and the air leakage part repair material is cured.

[0045] Figure 12 Figure 12 This shows an example of the air leakage part repair method of the first embodiment, and is a photograph showing the state in which the repair of the air leakage part is completed.

[0046] Figure 13 Figure 13 This shows an example of the air leakage part determination method of the second embodiment, and is a photograph showing the air leakage part.

[0047] Figure 14 Figure 14 ​​​​​​​​​​​​​​​​​​​​​An example of the method for determining the air leakage site of the second embodiment is a photograph showing the state where an air leakage site determination material is applied to the air leakage site.

[0048] Figure 15 Figure 15 An example of the method for determining the air leakage site of the second embodiment is a photograph showing the state where a tube is provided at the air leakage site.

[0049] Figure 16 Figure 16 It is a photograph showing an example of the on-off valve used in the method for determining the air leakage site of the second embodiment.

[0050] Figure 17 Figure 17 An example of the method for repairing the air leakage site of the second embodiment is a photograph showing the air leakage site.

[0051] Figure 18 Figure 18 An example of the method for repairing the air leakage site of the second embodiment is a photograph showing the state where a tube is provided at the air leakage site.

[0052] Figure 19 Figure 19 An example of the method for repairing the air leakage site of the second embodiment is a photograph showing the state where an on-off valve is connected to the tube.

[0053] Figure 20 Figure 20 An example of the method for repairing the air leakage site of the second embodiment is a photograph showing the state where the on-off valve is closed.

[0054] Figure 21 Figure 21 An example of the method for repairing the air leakage site of the second embodiment is a photograph showing the state where the repair of the air leakage site is completed. Detailed Embodiment

[0055] (Air Leakage Site Determination Material)

[0056] The air leakage site determination material of the present invention is an air leakage site determination material used to apply to a suspected air leakage site to determine the air leakage site. If the viscosity at 25°C when the shear rate is 0.1 s -1 is set as A (Pa·s), and the viscosity at 25°C when the shear rate is 10 s -1 is set as B (Pa·s), then the following formula is satisfied: A / B ≥ 21.0, and the elastic modulus E' at 50°C after curing is 10 MPa or more.

[0057] ​​​​​​​​​​​​​​According to the material for determining the air leakage part of the present invention, the air leakage part can be easily determined through a simple operation of only applying to the suspected air leakage part.

[0058] The suspected air leakage part refers to the range including the air leakage part in the object for determining or repairing the air leakage part, and is the range including the part where air leakage may occur.

[0059] As a method for applying the material for determining the air leakage part, there is no particular limitation, and it can be appropriately selected according to the purpose, and various coating methods and the like can be cited.

[0060] As the above coating method, for example, brush coating, blade coating method, gravure coating method, gravure offset coating method, wire bar coating method, rod coating method, roll coating method, knife coating method, air knife coating method, bevel wheel coating method, U-shaped bevel wheel coating method, AKKU coating method, smooth coating method, microgravure coating method, reverse roll coating method, 4 to 5 roll coating method, dip coating method, curtain coating method, slide coating method, die coating method, inkjet method, etc. can be cited.

[0061] The viscosity at 25°C when the shear rate is 0.1 s -1 is set as A (Pa·s), and the viscosity at 25°C when the shear rate is 10 s -1 is set as B (Pa·s), it is preferably satisfied that the thixotropy ratio (A / B) ≥ 21.0, and it is satisfied that the thixotropy ratio (A / B) ≥ 80.

[0062] The viscosity A at 25°C when the shear rate is 0.1 s -1 is preferably 500 Pa·s or more, and more preferably 1000 Pa·s or more.

[0063] By using the material for determining the air leakage part with a thixotropy ratio (A / B) of 21.0 or more, when applying the material for determining the air leakage part to the suspected air leakage part, the material for determining the air leakage part will not splash due to the air leakage pressure of the air leakage part, but will generate holes in the coating film of the air leakage part while maintaining a certain thickness, so that the air leakage part can be simply and reliably determined.

[0064] If the viscosity A at 25°C when the shear rate is 0.1 s -1 is less than 500 Pa·s, due to the air leakage pressure of the air leakage part, the applied material for determining the air leakage part may splash, so that the repair of the air leakage part becomes difficult.

[0065] In addition, if the thixotropy ratio (A / B) of the material for determining the air leakage part is less than 21.0 and the viscosity A at 25°C when the shear rate is 0.1 s -1 is 500 Pa·s or more, no holes will be generated in the coating film, and voids will be generated at the coating interface.

[0066] If the thixotropy ratio (A / B) of the material for determining the air leakage part is 21.0 or more and the viscosity A at 25°C at a shear rate of 0.1 s -1 is 500 Pa·s or more, the air leakage part can be easily determined, and the same material for determining the air leakage part can be used to repair the air leakage part.

[0067] Here, the viscosity of the material for determining the air leakage part can be measured using AR-G2 manufactured by TA Instrument.

[0068] Using a cone plate with a diameter of 20 mm and an angle of 2°, in an environment of 25°C, within a shear rate (shear speed) range of 0.01 s to 100 s -1 for measurement. It should be noted that the viscosity is evaluated based on the value at a shear rate of 0.1 s -1 . In addition, the ratio (A / B) of the viscosity A at 25°C at a shear rate of 0.1 s -1 to the viscosity B at 25°C at a shear rate of 10 s -1 is defined as the thixotropy ratio.

[0069] The elastic modulus E' at 50°C after curing is 10 MPa or more, preferably 25 MPa or more.

[0070] If a material for determining the air leakage part with an elastic modulus E' at 50°C after curing of 10 MPa or more is used, pores are likely to be generated in the coating film due to the air leakage pressure, so the air leakage part can be easily determined, and it can be confirmed that the air leakage has stopped for more than 1 minute in the air leakage tightness test. In addition, if a material for determining the air leakage part with an elastic modulus E' at 50°C after curing of less than 10 MPa is used, air leakage (immediate air leakage) will occur in less than 1 minute in the air leakage tightness test. It should be noted that if a material for determining the air leakage part with an elastic modulus E' at 50°C after curing of 25 MPa or more is used, it can be confirmed that the air leakage has stopped for more than 1 hour in the air leakage tightness test.

[0071] Here, regarding the elastic modulus E' at 50°C after curing, the material for determining the air leakage part is coated as a sample to a thickness of 1 mm, cured using a UV lamp U1 manufactured by JAXMAN, and temperature dispersion measurement is performed using RSAIII manufactured by TA Instrument in the tensile mode, at a frequency of 10 Hz, a heating rate of 10°C / minute, and in the range of 25°C to 100°C to obtain the value of the elastic modulus E' at 50°C after curing.

[0072] In the present invention, it is preferable to use a material for determining the air leakage part that is cured by irradiation with light having a wavelength of 420 nm or less.

[0073] By using a leak location determination material that cures with light having a wavelength of 420 nm or less, compared with the case of using a leak location determination material that cures with long-wavelength light, the leak location determination material can be cured in a short time, and the operation time can be significantly shortened.

[0074] The leak location determination material of the present invention contains a curable resin composition.

[0075] The curable resin composition contains a polymerizable compound and / or a polymerization initiator, preferably contains a sensitizer, a photoacid generator, a colorant, and further contains other components as needed.

[0076] The curable resin composition can be cured by various curing methods such as photocuring, thermal curing, two-component mixing type (for example, two-component mixing type acrylic resin, epoxy resin, etc.), moisture curing, or a combination thereof. Among them, from the viewpoint of curing speed, photocuring is preferred.

[0077] <Polymerizable compound>

[0078] The polymerizable compound is a compound that undergoes a polymerization reaction and cures by heating or active energy rays (ultraviolet rays, electron beams, etc.), and examples thereof include compounds containing a radical polymerizable group and compounds containing a cationic polymerizable group.

[0079] <<Compound containing a radical polymerizable group>>

[0080] As the above-mentioned compound containing a radical polymerizable group (radical polymerization component), as long as it is a compound having a radical polymerizable group, there is no particular limitation, and it can be appropriately selected according to the purpose.

[0081] As the above-mentioned radical polymerizable group, for example, (meth)acryloyloxy can be cited.

[0082] Here, (meth)acryloyloxy means acryloyloxy or methacryloyloxy.

[0083] The radical polymerizable group possessed by the above-mentioned compound containing a radical polymerizable group can be one or two or more.

[0084] As the above-mentioned compound containing a radical polymerizable group, for example, an ester compound obtained by reacting (meth)acrylic acid with a compound having a hydroxyl group, a (meth)acrylic acid epoxy ester obtained by reacting (meth)acrylic acid with an epoxy compound, a urethane (meth)acrylate obtained by reacting an isocyanate with a (meth)acrylic acid derivative having a hydroxyl group, etc. can be cited.

[0085] Herein, (meth)acrylic acid means acrylic acid or methacrylic acid, and (meth)acrylate means acrylate or methacrylate.

[0086] Examples of the compound having a radical polymerizable group with one radical polymerizable group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, isooctyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, isobornyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, methoxyethylene glycol (meth)acrylate, 2-ethoxyethyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, benzyl (meth)acrylate, ethyl carbitol (meth)acrylate, phenoxyethyl (meth)acrylate, phenoxy diethylene glycol (meth)acrylate, phenoxy polyethylene glycol (meth)acrylate, methoxy polyethylene glycol (meth)acrylate, 2,2,2-trifluoroethyl (meth)acrylate, 2,2,3,3-tetrafluoropropyl (meth)acrylate, 1H,1H,5H-octafluoropentyl (meth)acrylate, (meth)acrylimide ester, methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, propyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isononyl (meth)acrylate, isomyristyl (meth)acrylate, isostearyl (meth)acrylate, 2-butoxyethyl (meth)acrylate, 2-phenoxyethyl (meth)acrylate, dicyclopentenyloxy (meth)acrylate, isodecyl (meth)acrylate, diethylaminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, 2-(meth)acryloyloxyethyl succinic acid, 2-(meth)acryloyloxyethyl hexahydrophthalic acid, 2-(meth)acryloyloxyethyl 2-hydroxypropyl phthalate, 2-(meth)acryloyloxyethyl phosphate, etc. They can be used alone or in combination of two or more.

[0087] As the compound containing a radically polymerizable group having two radically polymerizable groups, for example, 1,4-butanediol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, 2-n-butyl-2-ethyl-1,3-propanediol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol (meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene oxide adduct bisphenol A di(meth)acrylate, ethylene oxide adduct bisphenol A di(meth)acrylate, ethylene oxide adduct bisphenol F di(meth)acrylate, dimethylol dicyclopentadienyl di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethylene oxide modified isocyanuric acid di(meth)acrylate, 2-hydroxy-3-(meth)acryloyloxypropyl (meth)acrylate, carbonate diol di(meth)acrylate, polyether diol di(meth)acrylate, polyester diol di(meth)acrylate, polycaprolactone diol di(meth)acrylate, polybutadiene diol di(meth)acrylate, etc. may be mentioned. They may be used alone or in combination of two or more.

[0088] As the compound containing a radically polymerizable group having three or more radically polymerizable groups, for example, pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, propylene oxide adduct trimethylolpropane tri(meth)acrylate, ethylene oxide adduct trimethylolpropane tri(meth)acrylate, caprolactone modified trimethylolpropane tri(meth)acrylate, ethylene oxide adduct isocyanuric acid tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, bis-trimethylolpropane tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate, glycerol tri(meth)acrylate, propylene oxide adduct glycerol tri(meth)acrylate, tri(meth)acryloyloxyethyl phosphate, etc. may be mentioned. They may be used alone or in combination of two or more.

[0089] The compound containing a radically polymerizable group may be a so-called oligomer.

[0090] As the oligomer, for example, (meth)acrylate oligomer may be mentioned.

[0091] As the above-mentioned (meth)acrylate oligomer, for example, polyurethane (meth)acrylate oligomer, polyisoprene (meth)acrylate oligomer, polybutadiene (meth)acrylate oligomer, polyether (meth)acrylate oligomer, etc. can be cited. Furthermore, a radical polymerizable group can also be imparted to the following acrylic polymers.

[0092] Acrylic polymers: Copolymers of butyl acrylate, 2-hexyl acrylate, and acrylic acid, cyclohexyl acrylate, and methacrylic acid

[0093] The weight-average molecular weight of the above-mentioned oligomer is not particularly limited and can be appropriately selected according to the purpose. It is preferably 1,000 to 100,000, more preferably 2,000 to 80,000, and particularly preferably 5,000 to 50,000. The above weight-average molecular weight can be measured, for example, by GPC (gel permeation chromatography).

[0094] 《Compound Containing a Cationic Polymerizable Group》

[0095] As the above-mentioned compound containing a cationic polymerizable group (cationic polymerization component), as long as it has a functional group (cationic polymerizable group) that reacts with a proton or a carbocation generated by the action of a Bronsted acid or a Lewis acid, there is no particular limitation, and it can be appropriately selected according to the purpose.

[0096] The curable resin composition containing a compound containing a cationic polymerizable group can be a one-component type or a two-component type.

[0097] As the above-mentioned cationic polymerizable group, for example, alkoxysilyl group, epoxy group, vinyl ether group, oxetanyl group, etc. can be cited. Among them, alkoxysilyl group and epoxy group are preferred.

[0098] As the above-mentioned alkoxysilyl group, there is no particular limitation, and it can be appropriately selected according to the purpose. A group represented by the following general formula (1) is preferred.

[0099] [Chemical formula 1]

[0100]

[0101] Among them, in the above general formula (1), R 1 represents either an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms. R 2 and R 3 each independently represent an alkyl group having 1 to 3 carbon atoms.

[0102] As the above alkoxysilyl group, from the viewpoint of excellent cationic polymerizability, trimethoxysilyl group, triethoxysilyl group, dimethoxymethylsilyl group, and diethoxymethylsilyl group are preferable.

[0103] The above epoxy group may be an alicyclic epoxy group or a non-alicyclic epoxy group. As the above epoxy group, for example, groups represented by the following general formula (2), groups represented by the following general formula (3), etc. can be cited.

[0104] [Chemical formula 2]

[0105]

[0106] Among them, in the above general formula (2), R 4 represents either a hydrogen atom or a methyl group.

[0107] From the viewpoints of improving the compatibility of the raw materials in the above curable resin composition and preventing phase separation of the cured product of the above curable resin composition, the above compound containing a cationic polymerizable group preferably further has a radically polymerizable group.

[0108] It should be noted that in the present invention, the above compound containing a cationic polymerizable group having a radically polymerizable group does not belong to the above compound containing a radically polymerizable group, but belongs to the above compound containing a cationic polymerizable group.

[0109] As the above compound containing a cationic polymerizable group having a radically polymerizable group, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, compounds represented by the following general formula (4) can be cited.

[0110] [Chemical formula 3]

[0111]

[0112] Among them, in the above general formula (4), R represents either a hydrogen atom or a methyl group, X represents a cationic polymerizable group, and Y represents a divalent linking group.

[0113] As the above X, for example, groups represented by the above general formula (1), groups represented by the above general formula (2), groups represented by the above general formula (3), etc. can be cited.

[0114] As the above Y, for example, alkylene group, alkyleneoxyalkylene group, etc. can be cited. As the above alkylene group, for example, C 1-6 alkylene group. As the above alkyleneoxyalkylene group, for example, C 1～6 alkyleneoxy C 1～6 alkylene group, etc. Here, C 1～6 represents 1 to 6 carbon atoms.

[0115] Examples of the compound having a cationic polymerizable group and a radically polymerizable group among the compounds represented by the above general formula (4) include methyl 3,4-epoxycyclohexyl methacrylate, (3-ethyl-3-oxetanyl)methyl acrylate, (3-ethyl-3-oxetanyl)methyl methacrylate, glycidyl (meth)acrylate, glycidyl ether of 4-hydroxybutyl (meth)acrylate, 2-(2-vinyloxyethoxy)ethyl acrylate, 2-(2-vinyloxyethoxy)ethyl methacrylate, and the like. They may be used alone or in combination of two or more.

[0116] <Polymerization initiator>

[0117] Examples of the polymerization initiator include thermal polymerization initiators, photoinitiators, etc. Among them, photoinitiators are preferred.

[0118] As the photoinitiator, any photoinitiator that can generate active species such as free radicals and cations by using the energy of light (especially ultraviolet light) to initiate the polymerization of polymerizable compounds can be used. One kind of free radical polymerization initiator, cationic polymerization initiator, base generator, etc. can be used alone or in combination of two or more. Among them, free radical polymerization initiators are preferred.

[0119] Examples of the free radical polymerization initiator include aromatic ketones, acylphosphine oxide compounds, aromatic salt compounds, organic peroxides, sulfur compounds (thioxanthone compounds, compounds containing thiophene groups, etc.), hexarylbiimidazole compounds, ketoxime ester compounds, borate ester compounds, azine compounds, metallocene compounds, active ester compounds, compounds having a carbon-halogen bond, alkylamine compounds, etc. They may be used alone or in combination of two or more.

[0120] <Sensitizer>

[0121] In the curable resin composition, a sensitizer may also be used for the purpose of preventing a decrease in the curing rate caused by absorption or shielding of light (especially ultraviolet light) during irradiation with light (especially ultraviolet light).

[0122] Examples of the sensitizer include aliphatic amines, amines having an aromatic group, cyclic amine compounds such as piperidine; urea compounds such as o-tolylthiourea; sulfur compounds such as sodium diethylthiophosphate and soluble salts of aromatic sulfonic acids; nitrile compounds such as N,N'-disubstituted-p-aminobenzonitrile; phosphorus compounds such as tri-n-butylphosphine and sodium diethyldithiophosphate; Michler's ketone, N-nitrosohydroxylamine derivatives, oxazolidine compounds, tetrahydro-1,3- Nitrogen compounds such as condensates of quinazine compounds, formaldehyde, acetaldehyde and diamines, etc. They can be used alone, or two or more of them can be used in combination.

[0123] <Photoacid generator>

[0124] The curable resin composition preferably contains a photoacid generator as a compound that generates an acid upon absorbing light.

[0125] As the photoacid generator, preferably salt.

[0126] As the above salt, for example, diazonium salts, iodine salts and sulfonium salts can be cited. They can be used alone, or two or more of them can be used in combination. Among them, from the viewpoint of stability, iodine salts and sulfonium salts are preferred.

[0127] <Colorant>

[0128] By containing a colorant, the curable resin composition can color the coating film and make it easier to find the repair site, so it is preferred.

[0129] There is no particular limitation on the colorant, and it can be appropriately selected according to the purpose. Pigments and dyes can be used, and pigments are preferred.

[0130] As the pigment, inorganic pigments or organic pigments can be used. They can be used alone, or two or more of them can be used in combination. In addition, as the pigment, mixed crystals can also be used.

[0131] As the pigment, for example, black pigments, yellow pigments, magenta pigments, cyan pigments, white pigments, green pigments, orange pigments, metallic pigments such as gold or silver, and metallic pigments can be used.

[0132] As the inorganic pigment, for example, in addition to titanium oxide, zinc oxide, aluminum oxide, talc, silica, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, and chrome yellow, carbon black manufactured by known methods such as the contact method, furnace method, and thermal method can also be used.

[0133] As the organic pigment, for example, azo pigments, polycyclic pigments (such as phthalocyanine pigments, perylene pigments, pyrenone pigments, anthraquinone pigments, quinacridone pigments, di azine pigments, indigo pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments, etc.), dye chelates (such as basic dye type chelates, acid dye type chelates, etc.), nitro pigments, nitroso pigments, aniline black, etc. Among them, pigments with good affinity for the solvent are preferably used. In addition, resin hollow particles and inorganic hollow particles can also be used.

[0134] As specific examples of the pigment, for black use, carbon blacks such as furnace black, lamp black, acetylene black, channel black (C.I. Pigment Black 7), or metals such as copper, iron (C.I. Pigment Black 11), titanium oxide, and organic pigments such as aniline black (C.I. Pigment Black 1) can be cited.

[0135] Furthermore, for color use, for example, the following can be cited: C.I. Pigment Yellow 1, 3, 12, 13, 14, 17, 24, 34, 35, 37, 42 (yellow iron oxide), 53, 55, 74, 81, 83, 95, 97, 98, 100, 101, 104, 108, 109, 110, 117, 120, 138, 150, 153, 155, 180, 185, 213, C.I. Pigment Orange 5, 13, 16, 17, 36, 43, 51, C.I. Pigment Red 1, 2, 3, 5, 17, 22, 23, 31, 38, 48:2 (Permanent Red 2B (Ca)), 48:3, 48:4, 49:1, 52:2, 53:1, 57:1 (Brilliant Carmine 6B), 60:1, 63:1, 63:2, 64:1, 81, 83, 88, 101 (red iron oxide), 104, 105, 106, 108 (cadmium red), 112, 114, 122 (quinacridone magenta), 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 184, 185, 190, 193, 202, 207, 208, 209, 213, 219, 224, 254, 264, C.I. Pigment Violet 1 (rhodamine lake), 3, 5:1, 16, 19, 23, 38, C.I. Pigment Blue 1, 2, 15 (phthalocyanine blue), 15:1, 15:2, 15:3, 15:4 (phthalocyanine blue), 16, 17:1, 56, 60, 63, C.I. Pigment Green 1, 4, 7, 8, 10, 17, 18, 36, etc. They can be used alone or in combination of two or more.

[0136] -Other components-

[0137] As the above-mentioned other components, there is no particular limitation, and they can be appropriately selected according to the purpose. For example, surfactants, viscosity regulators, adhesion imparting agents, antioxidants, anti-aging agents, crosslinking accelerators, ultraviolet absorbers, plasticizers, preservatives, dispersants, etc. can be cited.

[0138] The material is determined according to the air leakage part of the present invention, and the air leakage part can be easily determined only by a simple operation of applying to the suspected air leakage part.

[0139] As a method for determining the air leakage part using the material for determining the air leakage part of the present invention, it can be appropriately carried out by the following method for determining the air leakage part of the present invention.

[0140] (Method for Determining Leakage Location)

[0141] The method for determining the leakage location of the present invention includes a leakage location determination process, and may also include other processes as needed.

[0142] <Leakage Location Determination Process>

[0143] The leakage location determination process is a process of forming a coating film made of the leakage location determination material of the present invention at the suspected leakage location, and determining the location of the hole generated due to the above-mentioned leakage in the above coating film as the leakage location.

[0144] If it is the state before the leakage location determination material is cured, the leakage location determination material is in a liquid state, and holes will be generated in the coating film formed by applying the leakage location determination material due to the pressure of the leakage, so the leakage location can be easily determined. At this time, the size and shape of the holes in the coating film generated and their peripheries can also be appropriately adjusted to facilitate repair.

[0145] It should be noted that for leakage locations with a small amount of leakage, even if the leakage location determination material of the present invention is applied, no holes will be generated due to the leakage, so the leakage location cannot be determined. However, in this case, the coating film composed of the applied leakage location determination material can be directly cured to repair the leakage location.

[0146] As the method for forming the coating film, there is no particular limitation, and it can be appropriately selected according to the purpose. For example, spin coating method, slot coating method, dip coating method, doctor blade coating method, rod coating method, spraying method, relief printing method, intaglio printing method, screen printing method, offset printing method, dispensing method, inkjet method, etc. can be cited.

[0147] Regarding the average thickness of the coating film, it can be appropriately selected according to the pressure of the leakage at the leakage location, and is preferably 50 μm or more and 5,000 μm or less.

[0148] <Other Processes>

[0149] As other processes, there is no particular limitation, and they can be appropriately selected according to the purpose. For example, cleaning process, drying process, etc. can be cited.

[0150] Preferably, after cleaning the suspected leakage location in the cleaning process, the leakage location determination process is carried out.

[0151] (Leakage Location Repair Material)

[0152] The leakage location repair material of the present invention uses the leakage location determination material of the present invention for repairing the leakage location. As the leakage location repair material of the present invention, the same material as the leakage location determination material of the present invention is used.

[0153] The leak location repair material according to the present invention does not require prior determination of the leak location, has a simple operation method, and can significantly shorten the operation time. In addition, since there is no need for a cavity for collecting leaks, it has the advantages of being difficult to peel off and difficult to leak again.

[0154] For the leak location determined by using the leak location determination material of the present invention, the leak location repair material of the present invention is used for repair. Thus, even if the leak amount is large, it can be repaired in a short time by a simple method.

[0155] As a leak location repair method using the leak location repair material of the present invention, it can be appropriately carried out by the following leak location repair method of the present invention.

[0156] (Leak location repair method)

[0157] In the first mode, the leak location repair method of the present invention includes a curing process and a repair process, and may further include other processes as needed.

[0158] <Curing process>

[0159] The curing process is a process of curing the coating film including the leak location determined by the leak location determination method of the present invention.

[0160] In the curing process, at the leak location determined by the leak location determination method of the present invention, holes are generated in the coating film due to the pressure of the leak. Therefore, the coating film including the holes is cured to fix the holes generated in the coating film.

[0161] As the curing mechanism, a heat curing mechanism or a light curing mechanism can be cited.

[0162] As the heat curing mechanism, it includes a mechanism for heating the object to be repaired. For example, an infrared heater, a warm air heater, a heating roller, etc. can be cited. As the heating temperature, there is no particular limitation, and it can be appropriately selected according to the purpose. It is preferably 50 °C or higher and 200 °C or lower.

[0163] As the light curing mechanism, for example, a ultraviolet (UV) irradiation lamp, an electron beam irradiation device, etc. can be cited. The above light curing mechanism preferably has a mechanism for removing ozone.

[0164] As the type of the above ultraviolet (UV) irradiation lamp, for example, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a metal halide, etc. can be cited.

[0165] The above ultra-high-pressure mercury lamp is a point light source, but the Deep UV type with improved light utilization efficiency in combination with an optical system can perform irradiation in the short wavelength region.

[0166] Since the above metal halides have a wide wavelength region, they are effective for coloring materials. Halides of metals such as Pb, Sn, and Fe can be used and can be selected in combination with the absorption spectrum of the photoinitiator. As the lamp used in the curing, there is no particular limitation and it can be appropriately selected according to the purpose. For example, commercially available lamps such as the H lamp, D lamp, or V lamp manufactured by Fusion System can be used.

[0167] As the light irradiated on the coating film in the above curing process, there is no particular limitation and it can be appropriately selected according to the purpose. Ultraviolet light is preferred, near-ultraviolet light is more preferred, and light with a wavelength of 420 nm or less is particularly preferred.

[0168] As the irradiation time, there is no particular limitation and it can be appropriately selected according to the purpose.

[0169] <Repair process>

[0170] The repair process is a process of plugging the above-mentioned air leakage part after curing with the air leakage part repair material of the present invention and curing the air leakage part repair material.

[0171] In the above curing process, if it is cured in a state where the air leakage part is not determined, repair will be carried out in a state where voids and air passages are formed inside the air leakage part repair material, making it difficult to repair the air leakage part and reducing the reliability of the repair. In addition, when air leakage occurs again, the possibility of air leakage from a part different from the initial air leakage part becomes high, and even if the air leakage part is repaired, the possibility of air leakage from other parts again also becomes high.

[0172] In the present invention, the hole of the coating film where the air leakage part is determined in the curing process is plugged with the air leakage part repair material, and the plugged air leakage part repair material is cured for repair.

[0173] As the method of plugging with the air leakage part repair material, for example, the following can be cited: embedding of the air leakage part repair material, covering of the air leakage part repair material, embedding and covering of the air leakage part repair material, etc.

[0174] Regarding the light irradiated during the curing of the air leakage part repair material in the above repair process, the curing mechanism, the curing conditions, etc. are the same as those in the above curing process.

[0175] <Other processes>

[0176] As the above other processes, there is no particular limitation and they can be appropriately selected according to the purpose. For example, a cleaning process, a drying process, etc. can be cited.

[0177] It is preferred to carry out the above curing process after cleaning the suspected air leakage part in the cleaning process.

[0178] In the second method, the method for repairing a leaking part of the present invention includes: a step of curing the coating film while a tubular member is disposed at the leaking part of the coating film including the leaking part, the leaking part being determined by the method for determining a leaking part of the present invention; and a step of connecting an open shut-off valve to the tubular member that has been opened due to the leaking pressure after filling the repairing material for the leaking part of the present invention into the tubular member and closing the shut-off valve. Other steps may be included as needed.

[0179] (Leaking part repair device)

[0180] The leaking part repair device of the present invention may have a light source and a film-like member or a belt-like member that allows ultraviolet light to pass through the irradiation surface of the light source, and the repairing material for the leaking part of the present invention is assembled on the film-like member or the belt-like member.

[0181] According to the leaking part repair device of the present invention, the hole (leaking part) of the coating film is blocked by the repairing material for the leaking part assembled on the surface of the film-like member, and the repairing material for the leaking part is cured by irradiating ultraviolet light. Therefore, even if the amount of leakage from the leaking part is large, the repair can be simply performed in a short time.

[0182] <Light source>

[0183] Examples of the light source include ultraviolet (UV) irradiation lamps that can irradiate light with a wavelength of 420 nm or less.

[0184] <Film-like member>

[0185] As the film-like member, as long as it can transmit light with a wavelength of 420 nm or less, there are no particular limitations on its planar shape, size, material, and structure, and it can be appropriately selected according to the purpose.

[0186] Examples of the planar shape of the film-like member include a circle, an ellipse, a rectangle, a square, a rhombus, etc.

[0187] As the material of the film-like member, as long as it can transmit light with a wavelength of 420 nm or less, there are no particular limitations, and it can be appropriately selected according to the purpose. Examples include ultraviolet-transmitting resins.

[0188] Examples of the ultraviolet-transmissive resin include vinyl resins such as polyvinyl chloride and polyvinylidene chloride, polystyrene resins such as polystyrene and styrene-acrylonitrile-butadiene copolymer, fluorine resins such as tetrafluoro-hexafluoropropylene (FEP) and tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA), polyethylene resins such as ethylene-vinyl acetate copolymer, polyester resins such as polyethylene terephthalate (PET), polypropylene, poly-4-methylpentene, polymethyl methacrylate, polyethylene, cellulose (cellophane), polycarbonate, polyphenylene sulfide, polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK), polyethersulfone (PESU), aromatic polyamide, polyimide, and triacetate. They may be used alone or in combination of two or more.

[0189] It is preferred that the surface of the above-mentioned film-like member be subjected to a release treatment. Thereby, the air leakage part repair material of the present invention assembled on the surface of the film-like member can be moved to the air leakage part to block the holes (air leakage parts) of the coated film.

[0190] Examples of the release treatment include a treatment for applying fine irregularities to the surface of the film-like member, a silicone coating treatment, a fluorine coating treatment, etc.

[0191] <Strip-shaped member>

[0192] From the aspect of being able to be fixed to the irradiation surface of the light source, it is preferred to use a strip-shaped member having an adhesive layer on one side on the light source side and a release treatment on the other side (opposite side) on the light irradiation side. The above-mentioned release treatment can be performed in the same manner as the above-mentioned film-like member.

[0193] As the material of the strip-shaped member, there is no particular limitation as long as it can transmit light with a wavelength of 420 nm or less, and it can be appropriately selected according to the purpose, and the same ultraviolet-transmissive resin as the above-mentioned film-like member can be used.

[0194] Here, Figure 1 is a photograph showing an example of the gas pipe 1 to be repaired for air leakage. Figure 2 is a photograph showing an example of the top surface 1a of the closed flange portion of the gas pipe. Figure 3 is a photograph showing an example of the bottom surface 1b of the closed flange portion of the gas pipe. At Figure 3 a gas leakage part 2 with a diameter of 1 mm is provided on the bottom surface 1b of the closed flange portion of the shown gas pipe.

[0195] Figure 4 and Figure 5 is a photograph showing an example of the air leakage part repair device of the present invention. Figure 4 and Figure 5The air leakage part repair device 20 shown is handheld, 21 is a film-like member, and the surface of the film-like member 21 has been subjected to a demolding treatment with a silicone coating. During repair, a prescribed amount of the air leakage part repair material of the present invention is assembled on the surface of the film-like member 21 and pressed against the hole (air leakage part) of the coated film for repairing the air leakage part.

[0196] 22 is a push switch. By pressing the push switch with a finger, ultraviolet rays are irradiated through the film-like member 21 by a light source (not shown).

[0197] According to the air leakage part repair device of the present invention, the air leakage part repair material assembled on the surface of the film-like member is used to block the hole (air leakage part) of the coated film, and the air leakage part repair material is cured by irradiating light, thereby repairing the air leakage part. Therefore, compared with the method of using a conventional ultraviolet irradiation device separate from the pressurizing device, even if the air leakage amount from the air leakage part is large, the repair can be simply carried out in a short time.

[0198] Here, embodiments of the air leakage determination method and air leakage repair method of the present invention will be described in detail with reference to the drawings.

[0199] <First Embodiment>

[0200] Figure 6 An example of the air leakage part repair method of the first embodiment is shown, showing the state before repairing the air leakage part. It is a photograph showing a gas pipe 1 having a closed flange part, and a 1-mm-diameter air leakage part 2 is provided on the bottom surface 1b before repair.

[0201] Next, Figure 7 It is a photograph showing the state where the air leakage part determination material has been applied to the suspected air leakage part, and showing the state where the air leakage part determination material has been coated on the air leakage part 2 and its periphery on the bottom surface 1b of the closed flange part of the gas pipe to form a coated film 3. In addition, the air leakage part determination material contains a white colorant, and the coated film 3 is white.

[0202] Next, Figure 8 It is a photograph showing the state where holes are generated in the coated film due to air leakage, showing the state where holes 4 are generated in the coated film 3 due to the pressure of the air leakage from the air leakage part (air leakage part determination process). The holes 4 correspond to the air leakage part. Since the coated film 3 is white, the holes 4 can be easily found.

[0203] Next, Figure 9Shows the state where the film covering the air leakage part is cured, and it is a photo showing the state where the film covering 3 with a hole 4 is irradiated with ultraviolet rays using the air leakage part repair device 20 of the present invention to cure it. Thus, the hole 4 as the determined air leakage part and the film covering 3 with the hole are cured, and the hole is fixed (curing process).

[0204] Next, Figure 10 Shows the state of the cured air leakage part, and it is a photo showing the cured film covering 3a with the cured hole 4a.

[0205] Next, Figure 11 Shows the state where the air leakage part is blocked with the air leakage part repair material and the air leakage part repair material is cured, and it is a photo showing the state where the cured hole 4a is blocked with the air leakage part repair material and irradiated with ultraviolet rays using the air leakage part repair device 20 of the present invention to cure it (repair process).

[0206] Finally, Figure 12 Shows the state where the repair of the air leakage part is completed, and it is a photo showing the state where the hole is blocked and the repair of the air leakage part is completed.

[0207] <Second Embodiment>

[0208] The second embodiment is the following method: The air leakage part determination material of the present invention is applied to the repair part to form a film covering, a tubular member is provided at the repair part of the film covering, and the film covering is cured by irradiating it with ultraviolet rays. Then, the air leakage part repair material of the present invention is filled in the tubular member, a hole is formed in the tubular member by the air leakage pressure, an on-off valve is connected to the tubular member in an open state, and the on-off valve is closed, thereby repairing the air leakage part.

[0209] -Air Leakage Part Determination Method-

[0210] There are the following two air leakage part determination methods, A and B.

[0211] As Method A, as Figure 13 shown, if the air leakage part determination material 3 of the present invention is applied to the air leakage part 2 (refer to Figure 14 ), then a hole is formed in the film covering composed of the air leakage part determination material 3 due to the air leakage pressure. Therefore, for this hole, the tube 5 as a tubular member is press-connected with the center of the inner diameter of the tube 5 as a reference (refer to Figure 15)。If there is a gap after the crimping joint 5, the material 3 for determining the air leakage part is added as needed and formed. Then, the coating film is irradiated with ultraviolet rays to cure it, and the tube is fixed. Through the above operations, the air leakage part is determined. There is no particular limitation on the tubular member, and it can be appropriately selected according to the purpose. For example, a polyurethane tube etc. can be cited. The thixotropy ratio (A / B) of the material 3 for determining the air leakage part of the present invention is 21.0 or more.

[0212] It should be noted that, instead of using a tubular member, the Figure 16 opening and closing valve 6 as shown can be directly connected to the air leakage part 2 using the material 3 for determining the air leakage part. As the opening and closing valve 6, as long as it is an air valve, there is no particular limitation on the shape and material, and it can be appropriately selected according to the purpose. For example, a ball valve, a manual valve, a solenoid valve, a pipe valve etc. can be cited.

[0213] Even when the hole (air leakage part) in the coating film of the material 3 for determining the air leakage part is larger than the inner diameter or outer diameter of the tube 5, it is possible to add the material 3 for determining the air leakage part in the gap after the crimping joint and form it, so that after only the tube leaks air, the coating film is cured to fix the tube, and the air leakage part is determined.

[0214] As Method B, since the material 3 for determining the air leakage part is applied to the opening part of the tube 5 and the material 3 for determining the air leakage part is filled inside the tube and crimped to the air leakage part 2, holes are formed in the filled material 3 for determining the air leakage part due to the air leakage pressure. Therefore, it is also possible to directly cure the inside and outside of the tube 5 and fix it to the air leakage part 2. In addition, Method B can also be used in combination with Method A.

[0215] -Air leakage repair method-

[0216] (1) As Figure 17 shown, a hole (air leakage part 2) with a diameter of 10 mm is provided at the welding part, and an internal pressure of 0.8 MPa is applied by a compressor to make the gas spray out from the air leakage part 2.

[0217] (2) As Figure 18 shown, the air leakage repair material 7 of the present invention is applied to the air leakage part 2 to form a coating film. A polyurethane tube 5 (outer diameter 6 mm, inner diameter 4 mm, manufactured by Pisco Co., Ltd., Japan) is arranged as a tubular member at the repair part of the above coating film, and the coating film is cured by irradiating ultraviolet rays. It should be noted that the thixotropy ratio (A / B) of the air leakage repair material 7 of the present invention is 21.0 or more.

[0218] (3) As Figure 19 shown, the opening and closing valve 6 (manufactured by Pisco Co., Ltd., Japan, globe valve manual valve joint straight through) is connected to the tube 5 in an open state.

[0219] (4) As Figure 20As shown, close the on-off valve 6 to stop the air leakage (refer to Figure 21 ). Through the above operations, the repair of the air leakage part is completed.

[0220] <Use>

[0221] By using the air leakage part determination material of the present invention in the air leakage part determination method of the present invention, the air leakage part can be easily determined by a simple operation of only applying to the suspected air leakage part.

[0222] By using the air leakage part repair material of the present invention in the air leakage part repair method of the present invention, it is not necessary to previously determine the air leakage part. Even if the air leakage amount from the air leakage part is large, it can be simply repaired in a short time. Therefore, it can be suitably used for, for example, the repair of gas pipelines, gas filling equipment, gas insulated equipment, communication cables such as optical cables, etc.

[0223] Examples

[0224] Hereinafter, examples of the present invention will be described, but the present invention is not limited by any of these examples.

[0225] (Examples 1 to 15 and Comparative Examples 1 to 5)

[0226] <Production of air leakage part determination material>

[0227] Prepare air leakage part determination materials having the compositions and contents shown in Tables 1 to 3. Specifically, after mixing the binder components and additives shown in Tables 1 to 3, stir until the solid components are dissolved. It should be noted that the unit of the contents in Tables 1 to 3 is parts by mass.

[0228] Next, for each of the obtained air leakage part determination materials, the following characteristics were evaluated. The results are shown in Tables 1 to 3.

[0229] <Measurement of viscosity>

[0230] For each air leakage part determination material, measure the viscosity using an AR-G2 manufactured by TA Instrument. Specifically, use a cone plate with a diameter of 20 mm and an angle of 2°, and in an environment at a temperature of 25°C, measure the viscosity in the range of a shear rate (shear velocity) of 0.01 s -1 ~100 s -1 . It should be noted that the viscosity is evaluated based on the value at a shear rate of 0.1 s -1 . In addition, the ratio (A / B) of the viscosity A at 25°C at a shear rate of 0.1 s -1 to the viscosity B at 25°C at a shear rate of 10 s -1 is used as the thixotropic ratio.

[0231] <Measurement of elastic modulus>

[0232] The material for determining each leaking location was applied to the polyester film after mold release using a rod coater in such a manner that the average thickness became 1 mm, and was cured using a UV lamp U1 manufactured by JAXMAN. The temperature dispersion was measured using RSAIII manufactured by TA Instrument in a tensile mode, a frequency of 10 Hz, a heating rate of 10°C / min, and a range of 25°C to 100°C, and the value of the elastic modulus E' at 50°C after curing was determined.

[0233] <Hole Formability in Coating Film>

[0234] exist Figure 3 A leakage area with a diameter of 1 mm is set on the bottom surface 1b of the closed flange part of the gas piping shown. A material is applied to each leakage area with a brush in a manner to a thickness of 1 mm to form a coating. The hole formability on the coating is evaluated according to the following criteria based on the degree of opening of the holes on the coating.

[0235] [Evaluation criteria]

[0236] ○: The thickness of the coating is kept at 0.2 mm or more and a hole is opened at the leaking part

[0237] ×: There is no hole at the leaking part, the leaked gas escapes from the coating interface of the coating film, or the thickness of the coating film is less than 0.2 mm

[0238] <Air Leakage Tightness>

[0239] Gas piping has Figure 3 The bottom surface 1b of the closed flange of the gas piping shown in the figure has a leaking part with a diameter of 1mm. Under a state where a pressure based on air is applied to the gas piping in a manner of applying a pressure of 0.1MPa, a material for determining each leaking part is applied to the leaking part of the closed flange with a brush in a manner of a thickness of 1mm, thereby forming a coating film, and the coating film including the hole (leakage part) formed by the pressure of the leak is cured by irradiating ultraviolet light, and the cured leaking part is blocked with a leaking part repairing material, and the leaking part is repaired by irradiating the leaking part repairing material with ultraviolet light to cure it. Then, the leaking state of the leaking part is evaluated for leak tightness according to the following criteria. It should be noted that △ and above are feasible levels.

[0240] [Evaluation criteria]

[0241] 0: No leakage for more than 1 hour

[0242] △: Leakage for more than 1 minute and less than 1 hour

[0243] ×: Leakage within 1 minute (immediate leakage)

[0244] <Leak tightness using an on-off valve>

[0245] As Figures 17 to 21 shown, at the repair site, a material for determining each leak site is applied with a brush so that the thickness becomes 1 mm, thereby forming a coating film. A polyurethane tube 5 (outer diameter 6 mm, inner diameter 4 mm, manufactured by Pisco Co., Ltd., Japan) is disposed at the leak site of the coating film, and the coating film is cured by irradiating ultraviolet rays thereto. Then, a repair material for each leak site is filled in the tube, and after a hole is formed in the tubular member by the leak pressure, an on-off valve 6 (manufactured by Pisco Co., Ltd., Japan, stop valve manual valve joint straight through) is connected to the tube in an open state, and the on-off valve is closed, thereby repairing the leak site. Then, the leak state of the leak site is evaluated based on the following criteria. Note that Δ or more is an implementable level.

[0246] [Evaluation criteria]

[0247] 〇: No leakage for 1 hour or more

[0248] △: Leakage occurs in 1 minute or more and less than 1 hour

[0249] ×: Leakage occurs in less than 1 minute (immediate leakage)

[0250] [Table 1]

[0251]

[0252] [Table 2]

[0253]

[0254] [Table 3]

[0255]

[0256] The detailed contents of each component shown in Tables 1 to 3 are as described below.

[0257] <Polymerizable compound>

[0258] ·IBXA: Isobornyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.)

[0259] ·ISTA: Isostearyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.)

[0260] ·4HBA: 4-Hydroxybutyl acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.)

[0261] ·HDDA: 1,6-Hexanediol diacrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.)

[0262] · M100: 3,4-Epoxycyclohexylmethyl methacrylate (manufactured by Daicel Corporation)

[0263] <Polymerization initiator>

[0264] · IRG1173: Photoinitiator (manufactured by IGM Resins B.V.)

[0265] · IRG819: Photoinitiator (manufactured by IGM Resins B.V.)

[0266] <Photoacid generator>

[0267] · PI2074: Photoacid generator (manufactured by Rhodia Japan)

[0268] <Sensitizer>

[0269] · DETX-S: Sensitizer (manufactured by Nippon Kayaku Co., Ltd.)

[0270] <Additive>

[0271] · P4: Talc (manufactured by Nippon Talc Co., Ltd.)

[0272] · PP5WJ: Polypropylene (manufactured by SEISHIN ENTERPRISE CO., LTD.)

[0273] · AS200: Nano silica (manufactured by Nippon Aerosil Co., Ltd.)

[0274] · GS-64(LV): Silica (manufactured by Ryusen Co., Ltd.)

[0275] · SEPTON 4033: SEEPS (Hydrogenated styrenic thermoplastic elastomer, manufactured by Kuraray Co., Ltd.)

[0276] Symbol Explanation

[0277] 1 Gas piping

[0278] 1a Top surface of the closed flange part of the gas piping

[0279] 1b Bottom surface of the closed flange part of the gas piping

[0280] 2 Leakage part

[0281] 3 Leakage part determination material

[0282] 4 Hole generated in the coating film

[0283] 5 Tubular member (pipe)

[0284] 6 On-off valve

[0285] 7 Leakage part repair material

[0286] 20 Leakage part repair device

Claims

1. A material for determining the air leakage location, characterized in that it is A leak location determination material for applying to a suspected leak location to determine the leak location, Set the viscosity at 25°C at a shear rate of 0.1 s -1 to be A Pa·s, and set the viscosity at 25°C at a shear rate of 10 s -1 to be B Pa·s, then the following formula is satisfied: A / B ≥ 21.0 The storage modulus E' at 50°C after curing is 10 MPa or more.

2. The material for determining the air leakage location according to claim 1, wherein, Shear rate 0.1 s -1 The viscosity A at 25°C is 500 Pa·s or more.

3. The leak location determination material according to claim 1 or 2, which comprises a curable resin composition.

4. The material for determining the air leakage location according to claim 3, wherein, The curable resin composition contains a polymerizable compound and / or a polymerization initiator.

5. The leak location determination material according to claim 4, which further contains a colorant.

6. The leak location determination material according to claim 1 or 2, which is cured by irradiation with light having a wavelength of 420 nm or less.

7. A repair material for air leakage parts, characterized in that, The leak location determination material according to any one of claims 1 to 6 is used for repairing a leak location.

8. A method for determining the air leakage location, characterized in that, Comprising: A leak location determination step of forming a coating film formed of the leak location determination material according to any one of claims 1 to 6 on a suspected leak location, and determining the location of the hole generated in the coating film due to the leak as the leak location.

9. A method for repairing an air leakage part, characterized in that, Comprising: A curing step of curing the coating film including the leak location determined by the leak location determination method according to claim 8; And A repair step of plugging the cured leak location with the leak location repair material according to claim 7 and curing the leak location repair material.

10. A method for repairing an air leakage part, characterized in that, Comprising: A step of curing the coating film with a tubular member disposed at the leak location of the coating film including the leak location, the leak location being determined by the leak location determination method according to claim 8; and A step of connecting an on-off valve in an open state to the tubular member opened due to the leak pressure after filling the leak location repair material according to claim 7 into the tubular member and closing the on-off valve.

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