JP2013204114A - Adhesive gel for electrolytic protection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide adhesive gel for electrolytic protection having superior adhesive force to a metal plate while sufficiently suppressing swelling to water.SOLUTION: This adhesive gel for electrolytic protection includes polymer matrix, water, electrolyte and polyalcohol, and contains surface acting agent. The polymer matrix is composed of a copolymer of a non-ionic monofunctional monomer containing one polymerizable carbon-carbon double bond and polyfunctional monomer containing two or more polymerizable carbon-carbon double bonds. The surface acting agent is phosphoester type surface acting agent.

Description

  The present invention relates to an adhesive gel for cathodic protection used for adhesion between a metal electrode and a concrete structure in the cathodic protection method for a concrete structure, and more specifically, while sufficiently suppressing swelling against water. The present invention relates to an adhesive gel for cathodic protection having an excellent adhesion to metals.

  In concrete structures, when oxygen, water, chloride ions, etc. permeate inside, corrosion occurs in steel materials such as reinforcing bars, and corrosion products such as iron rust are generated. Cracks occur in concrete due to the volume expansion of the corrosion products accompanying the corrosion of steel. As a result, the corrosion of the steel material is further accelerated, and the deterioration of the cross section of the steel material is caused. As a result, the performance such as the strength of the concrete structure ultimately decreases. Therefore, various means for preventing corrosion of steel materials in concrete structures have been developed from the viewpoint of prolonging the service life (use) in concrete structures and from the viewpoint of minimum maintenance considering life cycle costs. One such means is the anticorrosion method.

There are two methods of the cathodic protection method: an external power supply method and a galvanic anode method. In general, the external power supply system uses a DC power supply, with the auxiliary electrode made of metal installed on the concrete surface as the anode (anode) and the steel material in the concrete structure to be protected against corrosion as the cathode (cathode). In this method, the anticorrosion current is passed between the auxiliary electrode and the steel material by energizing the auxiliary electrode and the steel material. (This anticorrosion current is a direct current, so a direct current power source is required.)
On the other hand, the galvanic anode method generally uses a steel material in a concrete structure as a cathode, a metal electrode made of a metal having a higher ionization tendency than iron installed on the concrete surface as an anode, and a steel material and a metal electrode. This is a method in which an anticorrosion current is caused to flow between the steel material and the metal electrode by utilizing the difference in ionization tendency.

  In both the external power supply method and the galvanic anode method, it is important to examine the material provided around the anode in order to effectively prevent corrosion. In the external power supply method and the galvanic anode method, the backfill that fills the outer surface of the anode is known in order to protect the anode performance and suppress / prevent the anode resistivity reduction and inactivation (passivation). It has been.

  As the backfill used for the electrical protection of concrete structures, including a water-absorbing resin and an alkaline aqueous solution, a gel-like one (see Patent Document 1), a metal chloride salt and a water-soluble polymer, A gelled product (see Patent Document 2) is known.

  However, the backfill oozes out of the concrete structure, especially when it is injected into the exterior of an outdoor concrete structure (such as the lower part of a road viaduct or a bridge girder) and used for cathodic protection. It is exposed to water such as rainwater.

  The backfill disclosed in Patent Document 1 swells significantly by absorbing water when exposed to water such as rainwater that has oozed out of the concrete structure. Since the proportion of the resin in the entire backfill is significantly reduced due to the significant swelling of the backfill, the adhesion of the anode to the metal and concrete structure is significantly reduced. As a result, the anode peels off from the backfill and the anticorrosion performance is lowered. In addition, the backfill disclosed in Patent Document 1 does not take adhesiveness into consideration, and because the adhesive strength of the anode to the metal is insufficient, the anode peels off from the backfill and the anticorrosion performance decreases. May end up.

  In addition, the backfill disclosed in Patent Document 2 does not take adhesiveness into consideration, and the adhesive strength of the anode to the metal is insufficient, so that the anode peels off from the backfill and the anticorrosion performance decreases. May end up.

  Patent Document 3 includes a polymer matrix composed of a copolymer of a nonionic polymerizable monomer and a crosslinkable monomer, water, a polyhydric alcohol, and a copolymer of acrylic acid and methacrylic acid. An adhesive hydrogel is disclosed.

  Since the adhesive hydrogel disclosed in Patent Document 3 has excellent flexibility, it is considered easy to follow the irregularities on the surface of a porous body such as concrete. Therefore, if the adhesive hydrogel disclosed in Patent Document 3 is disposed between the surface of the concrete structure and the anode in the cathodic protection method, the adhesive hydrogel becomes uneven on the surface of the concrete structure. It is considered easy to follow. In addition, if the sheet-like adhesive hydrogel disclosed in Patent Document 3 is adhered to the surface of a concrete structure, the adhesive hydrogel is installed by attaching the adhesive hydrogel to the surface of the concrete structure. Since only the attaching operation is required, it is considered that the workability is excellent as compared with the case where a desired container provided with an anode material is filled with a gel-like backfill, which is disclosed in Patent Document 1.

JP 2008-127678 A JP 2008-57015 A JP 2007-112972 A

  However, if the adhesive hydrogel disclosed in Patent Document 3 is applied to the outer surface of an outdoor concrete structure (such as a lower part of a road viaduct or a bridge girder) and used for cathodic protection, the adhesive The hydrogel swells significantly by absorbing water such as rainwater that has oozed out of the concrete structure. When the backfill swells significantly, the proportion of the resin in the entire backfill is significantly reduced, so that the adhesion of the anode to the metal is significantly reduced. As a result, the anode peels off from the backfill and the anticorrosion performance is lowered.

  As a method for suppressing the swelling of a conventional adhesive gel as disclosed in Patent Document 3 with respect to water, there is a method of increasing the content of a structural unit derived from a crosslinkable monomer (polyfunctional monomer). Are known. Thereby, since the crosslinking density of a polymer matrix becomes high, swelling with respect to water under alkaline conditions can be suppressed. When this swelling suppression method is applied to the adhesive hydrogel disclosed in Patent Document 3, and the adhesive hydrogel is attached to the surface of the concrete structure (under alkaline conditions), the swelling with respect to water can be suppressed. it is conceivable that.

  However, when the content of the structural unit derived from the crosslinkable monomer in the conventional adhesive gel is increased, the flexibility of the molecular gel of the polymer matrix is lost, and the flexibility of the adhesive gel is lost. There was a problem that the adhesive strength to metal was lowered.

  As described above, an adhesive gel that can sufficiently suppress swelling with respect to water and has an excellent adhesive force with respect to a metal has not been known.

  This invention is made | formed in view of such a condition, The objective is providing the adhesive gel for anticorrosion which has the outstanding adhesive force with respect to a metal, fully suppressing the swelling with respect to water. There is.

  In order to solve the above problems, an adhesive gel for cathodic protection of the present invention is an adhesive gel for cathodic protection comprising a polymer matrix, water, an electrolyte, and a polyhydric alcohol, and includes a surfactant. A non-ionic monofunctional monomer having one polymerizable carbon-carbon double bond and a polyfunctional monomer having two or more polymerizable carbon-carbon double bonds. And the surfactant is a phosphate ester type surfactant.

  According to the said structure, the adhesive force with respect to a metal can be improved, containing a phosphate ester type surfactant, fully suppressing the swelling with respect to water.

  In the present specification, “nonionic” means that a 1% by weight aqueous solution of a monofunctional monomer in a free acid or base state exhibits a pH of 4 to 9.

  ADVANTAGE OF THE INVENTION According to this invention, the adhesive gel for cathodic protection which has the outstanding adhesive force with respect to a metal can be provided, fully suppressing the swelling with respect to water by including a phosphate ester type surfactant.

  The adhesive gel for cathodic protection of the present invention is an adhesive gel for cathodic protection containing a polymer matrix, water, an electrolyte, and a polyhydric alcohol, which contains a surfactant, It consists of a copolymer of a nonionic monofunctional monomer having one polymerizable carbon-carbon double bond and a polyfunctional monomer having two or more polymerizable carbon-carbon double bonds. The surfactant is a phosphate ester type surfactant.

  In the present invention, a nonionic monofunctional monomer is used as the monofunctional monomer used to form the polymer matrix in order to improve the water resistance of the anticorrosive adhesive gel.

  The polymer matrix produced using an ionic monofunctional monomer has ionized side groups in the adhesive gel for cathodic protection, and the polymer matrix is charged either positively or negatively. Is in a state. For this reason, the straight chains of the polymer matrix always have the property of repulsion. When a large amount of water comes into contact with the repelling linear chains, the polymer matrix network opens in a short time. Therefore, an adhesive gel including a polymer matrix produced using an ionic monofunctional monomer exhibits a greater water absorption force and swells greatly due to water absorption. On the other hand, since the non-ionic monofunctional monomer is used in the anticorrosive pressure-sensitive adhesive gel of the present invention, the network of the polymer matrix is difficult to open and the swelling due to water is small. Further, in the adhesive gel for cathodic protection of the present invention, since the ionic group does not exist in the polymer matrix, the polymer matrix is not affected by the energization. Therefore, electrical repulsion at the interface of the anticorrosive pressure-sensitive adhesive gel is less likely to occur, and at the same time, the shrinkage of the anticorrosion pressure-sensitive adhesive gel due to the addition of an electrolyte for imparting conductivity is less likely to occur. Therefore, the adhesive gel for cathodic protection having higher performance such as adhesive strength can be obtained.

  The nonionic monofunctional monomer is not particularly limited as long as it is a nonionic compound having one polymerizable carbon-carbon double bond. Specific examples of the nonionic monofunctional monomer include nonionic (meth) acrylamide monomers; (poly) ethylene glycol (meth) acrylate and (poly) propylene glycol (meth) acrylate. And nonionic (meth) acrylic acid esters such as (poly) glycerin (meth) acrylate; nonionic N-vinylamide derivatives such as N-vinylpyrrolidone, N-vinylformamide, N-vinylacetamide, and the like It is done.

  Specific examples of the nonionic (meth) acrylamide monomer include (meth) acrylamide; N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N-butyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-methylol (meth) acrylamide, hydroxyethyl (meth) acrylamide Nonionic N-substituted (meth) acrylamides such as dimethylaminopropyl (meth) acrylamide, (meth) acryloylmorpholine, diacetone (meth) acrylamide, and the like.

  In the present specification, “(meth) acryl” means acryl or methacryl, “(meth) acrylate” means acrylate or methacrylate, and “(meth) acryloyl” means acryloyl or methacryloyl. To do. In the present specification, “(poly) ethylene glycol” means ethylene glycol or polyethylene glycol, “(poly) propylene glycol” means propylene glycol or polypropylene glycol, and “(poly) glycerin” means glycerin or Means polyglycerol.

  The nonionic monofunctional monomer is preferably a nonionic (meth) acrylamide monomer. Thereby, the adhesive gel for anticorrosion shows strong adhesive force in the anticorrosion use used by affixing on the concrete and metal of alkaline conditions. In particular, in addition to improving the initial adhesive strength of the anticorrosive adhesive gel, the adhesive strength of the anticorrosive adhesive gel can be improved over time.

  Among the nonionic (meth) acrylamide monomers, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, dimethyl At least one selected from the group consisting of aminopropyl (meth) acrylamide, hydroxyethyl (meth) acrylamide, and (meth) acryloylmorpholine is preferred as the nonionic monofunctional monomer. When the nonionic monofunctional monomer is at least one selected from the group consisting of these compounds, it exhibits good polymerization reactivity with the polyfunctional monomer described later, and is an anticorrosive adhesive. In order to show good affinity with the polyhydric alcohol in the conductive gel, the anticorrosive pressure-sensitive adhesive gel has no phase separation and is more uniform, and is excellent in workability and pressure-sensitive adhesiveness.

  The compound illustrated as said nonionic monofunctional monomer may be used independently, and 2 or more types may be used together.

  In addition, the content of the structural unit derived from the nonionic monofunctional monomer in the anticorrosive pressure-sensitive adhesive gel is not particularly limited, but is 10% with respect to 100% by weight of the anticorrosion pressure-sensitive adhesive gel. It is preferably in the range of ˜50% by weight, and more preferably in the range of 15 to 35% by weight. When the structural unit derived from the nonionic monofunctional monomer is less than 10% by weight based on 100% by weight of the anticorrosive adhesive gel, polyhydric alcohol bleeds from the surface of the anticorrosive adhesive gel. And the adhesive strength of the anticorrosive adhesive gel may decrease. When the structural unit derived from the nonionic monofunctional monomer exceeds 50% by weight with respect to 100% by weight of the anticorrosive adhesive gel, in the composition used for the preparation of the anticorrosive adhesive gel Since the presence state of the nonionic monofunctional monomer is non-uniform, it is impossible to produce an anticorrosive adhesive gel, or even if it is obtained, the adhesiveness and conductivity of the anticorrosive adhesive gel are reduced. It may cause unevenness.

  The polyfunctional monomer used in the present invention functions as a crosslinking agent. The polyfunctional monomer is not particularly limited as long as it is a compound having two or more polymerizable carbon-carbon double bonds in the molecule. Specific examples of the polyfunctional monomer include N, N′-methylenebis (meth) acrylamide, N, N′-ethylenebis (meth) acrylamide, (poly) ethylene glycol di (meth) acrylate, and glycerin tris. Examples thereof include polyfunctional (meth) acrylamides such as (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, and polyglycerin di (meth) acrylate.

As the polyfunctional monomer, C ₁ H _m O _n (where O means an oxygen atom of an ether bond, l is an integer of 4 or more, m is an integer of 6 or more, and n is an integer of 0 or more) The monomer represented by the composition formula of The monomer represented by the above composition formula is a monomer that does not have an alkali-hydrolyzing site such as an ester bond or an amide bond, so that the structural unit derived from the polyfunctional monomer is alkali-hydrolyzed. The collapse of the crosslinked structure of the polymer matrix caused by this, that is, the liquefaction of the adhesive gel for cathodic protection is suppressed. As a result, the adhesive gel for cathodic protection can ensure sufficient shape retention and adhesive strength over time under alkaline conditions. Examples of the monomer represented by the above composition formula include 1,4-butanediol divinyl ether, cyclohexane dimethanol divinyl ether, triethylene glycol divinyl ether, divinyl ether compounds such as diethylene glycol divinyl ether; diethylene glycol diallyl ether, pentaerythritol tri Examples include allyl ether compounds such as allyl ether; aromatic divinyl compounds such as divinylbenzene and divinylbiphenyl. When the polyfunctional monomer is at least one selected from the group consisting of the aromatic divinyl compound, the divinyl ether compound, and the allyl ether compound, a good polymerization reaction with the monofunctional monomer And good affinity with the polyhydric alcohol and the like in the above-mentioned adhesive gel for anticorrosion. Therefore, the anticorrosive pressure-sensitive adhesive gel does not undergo phase separation or the like, becomes more uniform, and has excellent workability and adhesiveness. Particularly, divinylbenzene is particularly suitable for use as a polyfunctional monomer in the present invention because it is easily available and has high polymerization reactivity.

  Although content of the structural unit derived from the said polyfunctional monomer in the said adhesive gel for anti-corrosion is not specifically limited, 0.01-0.5 weight with respect to 100 weight% of adhesive gel for anti-corrosion %, Preferably in the range of 0.02 to 0.3% by weight. When the content of the structural unit derived from the polyfunctional monomer is less than 0.01% by weight, the anticorrosive pressure-sensitive adhesive gel has a low crosslinking density and cannot secure shape stability. It may not be possible to suppress it. Further, when the content of the structural unit derived from the polyfunctional monomer exceeds 0.5% by weight, sufficient flexibility cannot be imparted to the above-mentioned anti-corrosion adhesive gel, and the above-mentioned anti-corrosion adhesive. The adhesive strength of the adhesive gel may be reduced.

  Therefore, by ensuring that the content of the structural unit derived from the polyfunctional monomer in the anticorrosive adhesive gel is within the above range, sufficient shape stability and swelling resistance of the anticorrosive adhesive gel are ensured. However, sufficient softness | flexibility of the grade which can maintain sufficient adhesive force can be provided with respect to the adhesive gel for cathodic protection.

The adhesive gel for cathodic protection of the present invention contains a phosphate type surfactant.
The phosphate ester type surfactant may be a reactive phosphate ester type surfactant incorporated into the copolymer (polymer matrix). What is the copolymer (polymer matrix)? Although it may be a non-reactive phosphate ester type surfactant contained in the adhesive gel for cathodic protection as another component, it is more preferably a reactive phosphate ester type surfactant. Here, the reactive phosphate ester type surfactant means a phosphate ester type surfactant having one or more carbon-carbon double bonds and showing radical polymerizability.

  The reason why the phosphate ester type surfactant is more preferably a reactive phosphate ester type surfactant will be described in detail below.

  Since the phosphate ester type surfactant is a reactive phosphate ester type surfactant, the polymer matrix is a nonionic monofunctional monomer having one polymerizable carbon-carbon double bond. And a polyfunctional monomer having two or more polymerizable carbon-carbon double bonds, and a copolymer of the phosphate ester type surfactant. That is, the more preferable reason is that the phosphate ester type surfactant can be incorporated into the skeleton of the polymer matrix, and the phosphate ester type surfactant is retained in the adhesive gel for cathodic protection for a long period of time. This is because it is possible to improve the uniformity and long-term stability of the adhesive strength of the anticorrosive adhesive gel.

  Examples of the non-reactive phosphate ester type surfactant include polyoxyalkylene alkyl ether phosphate ester, polyoxyalkylene alkyl phenyl ether phosphate ester, alkyl phosphate ester (aliphatic phosphate ester), and polyoxyalkylene. Phenyl phosphate ester etc. are mentioned.

  Specific examples of the polyoxyalkylene alkyl ether phosphate ester include polyoxyethylene tridecyl ether phosphate ester, polyoxyethylene alkyl ether phosphate ester, polyoxypropylene tridecyl ether phosphate ester, and polyoxypropylene alkyl ester. Ether phosphate ester etc. are mentioned.

  As a product of the non-reactive phosphate ester type surfactant currently on the market, for example, product name “Plysurf (registered trademark) A212C” (polyoxyethylene tridecyl ether phosphoric acid) manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Esters), "Plisurf (registered trademark) A215C" (polyoxyethylene tridecyl ether phosphate ester), and "Plysurf (registered trademark) A208F" (polyoxyethylene alkyl (C8) ether phosphate ester); Product name “ADEKA COAL (registered trademark) PS-810E” (polyoxyethylene alkyl ether phosphate ester) manufactured by ADEKA; product name “Fosphanol (registered trademark) RS-410” manufactured by Toho Chemical Industry Co., Ltd. Nord (registered trademark) RS-610 "," Phosphanol (registered) "RS-710", "Phosphanol (registered trademark) RA-600", "Phosphanol (registered trademark) GB-520" (polyoxyethylene alkyl ether phosphate); "Phosphanol (registered trademark) ML" -220 "," Phosphanol (registered trademark) RD-510Y "(polyoxyethylene lauryl ether phosphate); product names" Phosphanol (registered trademark) RL-210 "manufactured by Toho Chemical Industry Co., Ltd. "Fanol (registered trademark) RL-310" (polyoxyethylene lauryl ether phosphate); product names "Phosphanol (registered trademark) RB-410", "Phosphanol (registered trademark)" manufactured by Toho Chemical Industry Co., Ltd. “RD-720N” (polyoxyethylene oleyl ether phosphoric acid); product name “Foss” manufactured by Toho Chemical Industry Co., Ltd. ANOL (registered trademark) RP-710 "(polyoxyethylene phenyl phosphate ester); product name" GF-185 "(alkyl phosphate) manufactured by Toho Chemical Industry Co., Ltd .; product name" GF "manufactured by Toho Chemical Industry Co., Ltd. -199 "(lauryl phosphate) and the like.

  Examples of the reactive phosphate ester surfactant include polyoxyalkylene allyl ether phosphate, acid phosphooxyalkyl (meth) acrylate, 2- (meth) acryloyloxyalkyl acid phosphate, and the like. .

  Specific examples of the polyoxyalkylene allyl ether phosphate include polyoxyethylene allyl ether phosphate, polyoxypropylene allyl ether phosphate, polyoxybutylene allyl ether phosphate, and the like.

  As a product of the reactive phosphate type surfactant currently sold, for example, the product name “ADEKA rear soap (registered trademark) PP-70” (polyoxypropylene allyl ether phosphate ester) manufactured by ADEKA Co., Ltd. , “Adekaria Soap (registered trademark) PPE-710” (polyoxyalkylene allyl ether phosphate ester in which the oxyalkylene part is composed of oxyethylene and oxypropylene); "Phosmer M" (acid phosphoethyl methacrylate), "Phosmer PE" (acid phosphopolyethylene glymol monomethacrylate); "Tel P-1M" (2-methacryloyloxyethyl acid phosphate), "Light acrylate P-1A" (2-acryloyloxyethyl acid phosphate); Nippon Kayaku Co., Ltd. product name "PM-21" (2 -Methacryloyloxyethyl caproate acid phosphate) and the like.

  The content of the phosphate ester type surfactant in the adhesive gel for cathodic protection of the present invention is not particularly limited, but is 0.01 to 1.00% by weight relative to 100% by weight of the cathodic gel for cathodic protection. It is preferable that it is 0.05 to 0.50% by weight. When the content of the phosphate ester type surfactant in the adhesive gel for cathodic protection is less than 0.01% by weight, a sufficient effect of improving the adhesive force by adding the phosphate ester type surfactant can be obtained. Absent. Moreover, if the content of the phosphate ester type surfactant in the above-mentioned adhesive gel for anticorrosion exceeds 1.00% by weight, the reason is not clear, but the phosphate ester type interface of the adhesive gel surface for anticorrosion Since the concentration of the activator is higher than necessary and a layer of phosphate ester type surfactant is formed between the adherent gel for electrocorrosion protection and the adherend, the adhesion of the adhesive gel for electrocorrosion protection to the adherend The power may be reduced.

  The adhesive gel for cathodic protection of the present invention contains a polyhydric alcohol. The polyhydric alcohol functions as a plasticizer.

  The polyhydric alcohol is not particularly limited. For example, ethylene glycol, propylene glycol, 1,4-butanediol, glycerin, pentaerythritol, sorbitol, polyethylene glycol, polypropylene glycol, polyglycerin, polyoxyethylene glyceryl ether, and And polyoxypropylene polyglyceryl ether. When the polyhydric alcohol is at least one selected from the group consisting of these compounds, it exhibits good solubility for the monofunctional monomer and the polyfunctional monomer. The gel has no phase separation or the like, becomes more uniform, and has good adhesiveness and workability. In addition, the compound illustrated as said polyhydric alcohol may be used independently, and 2 or more types may be used together.

  The content of the polyhydric alcohol in the anticorrosive pressure-sensitive adhesive gel is not particularly limited, but is preferably in the range of 20 to 70 wt% with respect to 100 wt% of the anticorrosive pressure-sensitive adhesive gel, and 40 More preferably, it is in the range of -65% by weight. When the content of the polyhydric alcohol is less than 20% by weight with respect to 100% by weight of the above-mentioned anticorrosive adhesive gel, the anticorrosive adhesive gel has poor moisturizing power, and transpiration of water may be remarkable. is there. As a result, the adhesive gel for anticorrosion lacks stability over time and lacks flexibility, so that sufficient tackiness may not be obtained. In addition, when the content of the polyhydric alcohol exceeds 70% by weight with respect to 100% by weight of the anticorrosive adhesive gel, the amount of polyhydric alcohol that can be held by the polymer matrix is exceeded. Changes in physical properties due to bleed-out of polyhydric alcohol from the surface of the adhesive gel and changes in physical properties due to drying of the anticorrosive adhesive gel will maintain sufficient adhesiveness over time. There are things that cannot be done.

  The adhesive gel for cathodic protection of the present invention contains water.

  The content of water in the adhesive gel for cathodic protection of the present invention is not particularly limited, but is preferably 10 to 60% by weight with respect to 100% by weight of the cathodic gel for cathodic protection. It is more preferable that If the water content is less than 10% by weight with respect to 100% by weight of the anticorrosive pressure-sensitive adhesive gel, the water content of the anticorrosive pressure-sensitive adhesive gel is less than the equilibrium moisture content of the anticorrosive pressure-sensitive adhesive gel. In other words, the hygroscopic property of the anticorrosive pressure-sensitive adhesive gel becomes strong, and as a result, the anticorrosive pressure-sensitive adhesive gel may deteriorate (eg, swell) over time. If the water content exceeds 60% by weight with respect to 100% by weight of the anticorrosive pressure-sensitive adhesive gel, the water content of the anticorrosive pressure-sensitive adhesive gel is larger than the equilibrium moisture content of the anticorrosive pressure-sensitive adhesive gel. Too much, shrinkage of the adhesive gel for cathodic protection due to drying and changes in physical properties may occur.

  The adhesive gel for cathodic protection of the present invention contains an electrolyte. The adhesive gel for cathodic protection of the present invention contains an electrolyte, which is suitable as a conductive adhesive material or the like that is attached to concrete in the cathodic protection method using a fluid anode. It is a gel. Moreover, the said electrolyte may be used as a pH adjuster and may be used in order to improve the moisture retention performance of the adhesive gel for cathodic protection.

  The electrolyte is not particularly limited, and examples thereof include alkali metal halides such as sodium halide (for example, sodium chloride), lithium halide, and potassium halide; alkaline earth metal halides such as magnesium halide and calcium halide. And other metal halides. As the electrolyte, hypochlorite, chlorite, chlorate, perchlorate, sulfate, carbonate, nitrate, and phosphate of various metals are also suitable. Examples of the electrolyte include inorganic salts such as ammonium salts and various complex salts; salts of monovalent carboxylic acids such as acetic acid, benzoic acid, and lactic acid; polyvalent carboxylic acids such as tartaric acid, phthalic acid, succinic acid, adipic acid, and citric acid. Monovalent or divalent or higher salts; metal salts of organic acids other than carboxylic acids such as sulfonic acids, amino acids, etc .; organic ammonium salts; poly (meth) acrylic acid, polyvinyl sulfonic acid, poly tert-butylacrylamide sulfone Polymer electrolytes such as acid, polyallylamine, polyethyleneimine salts and the like are also suitable.

  The content of the electrolyte in the anticorrosive adhesive gel of the present invention is preferably 0.05% by weight to 10% by weight with respect to 100% by weight of the anticorrosive adhesive gel, and 2% by weight to 8%. More preferably, it is% by weight. When the anticorrosive adhesive gel containing moisture is placed on the conductive layer in the form of a sheet, the anticorrosive adhesive gel has an electric capacity corresponding to the thickness of the anticorrosive adhesive gel and the area of the conductive layer. . When the content of the electrolyte is less than 0.05% by weight with respect to 100% by weight of the adhesive gel for cathodic protection, the impedance of the adhesive gel for cathodic protection becomes high, and cannot be said to be suitable for cathodic protection applications. There is. Moreover, when the content of the electrolyte exceeds 10% by weight with respect to 100% by weight of the anticorrosive pressure-sensitive adhesive gel, it becomes difficult to dissolve the electrolyte in the anticorrosive pressure-sensitive adhesive gel. Therefore, precipitation of electrolyte crystals may occur or dissolution of other components may be hindered. Moreover, when the content of the electrolyte exceeds 10% by weight with respect to 100% by weight of the anticorrosive pressure-sensitive adhesive gel, the improvement in the conductive performance of the anticorrosive pressure-sensitive adhesive gel has reached its peak, and From the viewpoint of imparting electrical conductivity, it cannot be said that adding more electrolyte than this is beneficial.

  The adhesive gel for cathodic protection of the present invention includes, for example, a nonionic monofunctional monomer having one polymerizable carbon-carbon double bond and two or more polymerizable carbon-carbon double bonds. A polyfunctional monomer, a surfactant, water, an electrolyte, and an adhesive gel composition for anticorrosion containing a polyhydric alcohol, and a monofunctional monomer and a polyfunctional monomer Can be obtained by a production method in which polymer is polymerized to form a polymer matrix. In this case, the content rate of the structural unit derived from each monomer in the electrocorrosive adhesive gel corresponds to the content rate of each monomer in the electrocorrosive adhesive gel composition.

  It is preferable that the said composition for adhesive gels for anticorrosion contains a polymerization initiator. The polymerization initiator is not particularly limited, and examples thereof include a photopolymerization initiator and a thermal polymerization initiator.

  The photopolymerization initiator is not particularly limited as long as it is cleaved with ultraviolet rays or visible rays to generate radicals. For example, α-hydroxyketone, α-aminoketone, benzylmethyl ketal, bisacylphosphine oxide More specifically, 2-hydroxy-2-methyl-1-phenyl-propane-propan-1-one (product name: DAROCURE (registered trademark) 1173, BASF Japan Ltd. (former Ciba -Specialty Chemicals Co., Ltd.), 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one (Product name: Irgacure (registered trademark) 2959) , BASF Japan K.K. (formerly Ciba Specialty Chemicals Co., Ltd.), 2-hydroxy Cy-2-methyl-1-phenyl-propan-1-one (product name: DAROCURE (registered trademark) 1173, manufactured by BASF Japan Ltd.), 1-hydroxy-cyclohexyl-phenyl-ketone (product name: IRGACURE (registered trademark)) 184, manufactured by BASF Japan Ltd.), 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one (product name: Irgacure (registered trademark) 907, manufactured by BASF Japan Ltd.), 2-Benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one (product name: Irgacure (registered trademark) 369, manufactured by BASF Japan Ltd.), oligo {2-hydroxy-2- Methyl-1- [4- (1-methylvinyl) phenyl] propanone} (Ezacure (registered trademark) KIP1 0, DKSH manufactured by Japan Co., Ltd.), and the like. These photoinitiators may be used independently and 2 or more types may be used together.

  The thermal polymerization initiator is not particularly limited as long as it is cleaved by heat and generates radicals. For example, organic peroxides such as benzoyl peroxide; azobiscyanovaleric acid, azobisisobutyronitrile, etc. Azo polymerization initiators; persulfates such as potassium persulfate and ammonium persulfate; and azo compounds such as 2,2-azobisamidinopropane dihydrochloride. These thermal polymerization initiators may be used independently and 2 or more types may be used together. If necessary, a redox initiator comprising a reducing agent such as ferrous sulfate or pyrosulfite and a peroxide such as hydrogen peroxide or sodium thiosulfate may be used in combination with the thermal polymerization initiator.

  The content of the polymerization initiator in the composition for an anticorrosive adhesive gel of the present invention is not particularly limited, but is 0.01% by weight or more with respect to 100% by weight of the composition for an anticorrosive adhesive gel. It is preferable that it is 1% by weight or less. When the content of the polymerization initiator is less than 0.01% by weight with respect to 100% by weight of the composition for an anticorrosive adhesive gel, the polymerization reaction does not proceed sufficiently, and the resulting anticorrosive adhesive gel is obtained. In some cases, a monofunctional monomer and / or a polyfunctional monomer may remain. Moreover, when the content of the polymerization initiator exceeds 1% by weight with respect to 100% by weight of the composition for an anticorrosive adhesive gel, the adhesive for anticorrosion obtained by the residue of the polymerization initiator after the polymerization reaction. The gel may be discolored (yellowed) or may have an odor.

  It does not specifically limit as a method of manufacturing the said adhesive gel for cathodic protection, For example, the method of heating, light irradiation, or radiation irradiation etc. with respect to the said composition for adhesive gel for cathodic protection is mentioned. Specifically, a monofunctional monomer in the composition for an anticorrosive adhesive gel is prepared by adding a thermal polymerization initiator as a polymerization initiator to the above composition for an anticorrosive adhesive gel and heating. And a method of polymerizing a polyfunctional monomer; the composition for an anticorrosive pressure-sensitive adhesive gel contains a photopolymerization initiator as a polymerization initiator, and is electrically exposed by light irradiation (ultraviolet or visible light irradiation). A method of polymerizing a monofunctional monomer and a polyfunctional monomer in an anticorrosive adhesive gel composition; a thermal polymerization initiator and light as a polymerization initiator in the above anticorrosive adhesive gel composition A method of polymerizing a monofunctional monomer and a polyfunctional monomer in an adhesive composition for an anticorrosive adhesive gel by containing a polymerization initiator and simultaneously performing light irradiation and heating; Irradiating edible adhesive gel composition with radiation such as electron beam and gamma ray More, and a method of polymerizing a monofunctional monomer and a polyfunctional monomer sacrificial adhesive gel composition for such. In addition, when a redox initiator is used in combination as a thermal polymerization initiator, the reaction can be performed without heating, but a redox initiator is used in combination to reduce residual monomer or shorten the reaction time. Even if it is a case, it is preferable to heat.

The sacrificial adhesive gel of the present invention, in case of producing by ultraviolet irradiation for a sacrificial adhesive gel composition, the total irradiation amount of ultraviolet rays is in the range of 1000mJ / cm ² ~10000mJ / cm ² preferably there, and more preferably in a range of ^{2000mJ / cm 2 ~10000mJ / cm 2} .

  Moreover, the adhesive gel for cathodic protection of the present invention comprises a polymer matrix formed by a polymerization reaction of the monofunctional monomer and the polyfunctional monomer in advance with water, an electrolyte, a polyhydric alcohol, and phosphoric acid. Production method impregnated with ester type surfactant, or polymer matrix formed by polymerization reaction of monofunctional monomer and polyfunctional monomer in the presence of reactive phosphate ester type surfactant in advance Further, it can be produced by a production method in which water, an electrolyte, and a polyhydric alcohol are impregnated.

  By forming the adhesive gel for cathodic protection into a sheet, an adhesive gel sheet for cathodic protection can be obtained. The adhesive gel sheet for cathodic protection preferably has a thickness of 0.1 to 10 mm. The sheet-like adhesive gel sheet for anticorrosion having a thickness of 0.1 to 10 mm has excellent flexibility, excellent followability to uneven surfaces such as concrete and metal surfaces, and excellent workability. .

  The manufacturing method of the adhesive gel sheet for anticorrosion is not specifically limited, The adhesive gel sheet for anticorrosion can be manufactured by a well-known method. For example, after dripping the above-mentioned composition for an anticorrosive adhesive gel on a base film such as a resin film, the top surface of the adhesive film for an anticorrosion gel is covered with a top film such as a resin film. The composition for an anticorrosive adhesive gel is spread and controlled to a desired thickness. In this state, the monofunctional monomer and polyfunctional monomer in the adhesive gel composition for cathodic protection are polymerized and cross-linked by irradiation with light (ultraviolet rays) and / or heat to form a sheet having a desired thickness. An anticorrosive pressure-sensitive adhesive gel, that is, an anticorrosive pressure-sensitive adhesive gel sheet can be obtained.

  You may provide a base film in the single side | surface of the adhesive gel sheet for cathodic protection, and provide a top film in the back surface of the surface in which the base film was provided in the adhesive gel sheet for cathodic protection.

  As the base film, for example, a resin film made of a resin such as polyester, polyolefin, polystyrene, or polyurethane, paper, paper laminated with the resin film, or the like can be used.

  When the base film is used as a release paper (separator), it is preferable that the surface of the base film in contact with the adhesive gel sheet for anticorrosion is subjected to release treatment such as silicone coating. That is, when the base film is used as a release paper, a release treatment is performed on the surface of a film such as a resin film made of a resin (for example, polyester, polyolefin, polystyrene, etc.), paper, or a paper laminated with the resin film. A thing is used suitably as said base film. Examples of the mold release treatment method include a silicone coating, and a baking type silicone coating that is crosslinked and cured with heat or ultraviolet rays is particularly preferable. As the film subjected to the release treatment, a biaxially stretched PET (polyethylene terephthalate) film, OPP (biaxially stretched polypropylene), or the like is particularly preferable.

  When the base film is used as a packing material (backing material) for an adhesive gel sheet for anticorrosion rather than a release paper, a polyester film, a polyolefin film, a polystyrene film, a polyurethane film, etc. should be used without being subjected to a release treatment. preferable. Of these, polyurethane films are particularly preferable because they are flexible and have water vapor permeability. In addition, since a polyurethane film is usually too soft and difficult to handle in the production process, it is preferable to laminate and use a carrier film such as a polyolefin film or paper. In this case, it is preferable that the production process of the anticorrosive pressure-sensitive adhesive gel is performed with the carrier film attached to the base film.

  As the top film, basically the same material as that of the base film can be used. However, in order not to prevent photopolymerization, it is preferable to select a film that does not block light. Moreover, it is preferable not to use the film used for the packing material (backing material) as the top film. In particular, when the film used for the packing material may be deteriorated by irradiation with ultraviolet rays or the like, if the film used for the packing material is used as a top film, the film used for the packing material is positioned on the side directly irradiated with ultraviolet rays. Therefore, it is not preferable.

  When the composition for an anticorrosive adhesive gel is polymerized and cross-linked to form a gel, and the resulting sheet-shaped adhesive gel for anticorrosion (adhesive gel sheet for anticorrosion) is wound into a roll, the above base film And / or the base film preferably has flexibility. If a non-flexible film is provided on both surfaces of the anticorrosive adhesive gel sheet, curling may occur. Moreover, although the film which has a softness | flexibility may be arrange | positioned on either the inner surface side of a roll roll, or the outer surface side, it is preferable to arrange | position on the outer surface side.

[Concrete cathodic protection method for galvanic anode using adhesive gel for cathodic protection]
The adhesive gel for cathodic protection of the present invention can be suitably used for a galvanic anode type concrete cathodic protection method. The galvanic anode-type concrete cathodic protection method using the above-mentioned adhesive gel for cathodic protection uses a steel material in a concrete structure as a cathode, and a metal as an anode on the surface of the concrete structure through the cathodic gel for cathodic protection. And using a potential difference between the cathode steel material and the anode metal, an anticorrosion current is passed through the adhesive gel for cathodic protection. Therefore, in order to effectively perform the anticorrosion, the anode is preferably made of at least one kind of metal such as zinc, aluminum, and magnesium, and most preferably made of zinc. The metal of the anode used in the galvanic anode method can be in the form of a plate (panel) or a sheet.

  Note that the galvanic anode method does not require DC power supply maintenance management and maintenance power costs, and does not cause over-corrosion or adverse effects on adjacent structures, and has less variation in potential distribution than the external power supply method. Therefore, there is an advantage that a uniform anticorrosive effect can be obtained.

  The adhesive gel for cathodic protection of the present invention can also be used for a concrete cathodic protection method using an external power source. The above-mentioned concrete electric corrosion prevention method using an adhesive gel for cathodic protection uses a steel material in the concrete structure as a cathode and a metal as an anode on the surface of the concrete structure via an adhesive gel for cathodic protection. This is a method in which an anticorrosive current is passed through the above-mentioned adhesive gel for anticorrosion by arranging an auxiliary electrode and applying current to the cathode steel material and the anode auxiliary electrode from an external power source. The auxiliary electrode used in the external power supply method can be formed in a plate shape (panel shape), a mesh shape, or the like.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

[Example 1]
20 parts by weight of acrylamide (manufactured by Mitsubishi Chemical Corporation) as a nonionic (meth) acrylamide monomer (nonionic monofunctional monomer) and N, N′- as a polyfunctional monomer 0.05 parts by weight of methylenebisacrylamide, 59.30 parts by weight of glycerin (Japanese Pharmacopoeia concentrated glycerin) as a polyhydric alcohol, 2.5 parts by weight of sodium chloride as an electrolyte, and 18 parts by weight of water in a container The mixture was stirred and the nonionic (meth) acrylamide monomer, the polyfunctional monomer, and the electrolyte were dissolved in a polyhydric alcohol and water to prepare a monomer compounding solution. Next, 0.1 parts by weight of 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one as a photopolymerization initiator is added to the monomer mixture. In addition, the photopolymerization initiator was dissolved by stirring. Next, 0.05 parts by weight of a reactive phosphate ester type surfactant (Adekaria Soap (registered trademark) PP-70, manufactured by ADEKA Corporation) was added to the monomer blend solution in which the photopolymerization initiator was dissolved. By stirring, a composition for an anticorrosive adhesive gel was obtained.

Thereafter, the above composition for an anticorrosive pressure-sensitive adhesive gel was dropped on a silicone-coated PET film (base film) having a thickness of 100 μm, and then a silicone was coated on the dropped anticorrosive pressure-sensitive adhesive gel composition. The coated PET film (top film) with a thickness of 38 μm was covered and the adhesive composition for an anticorrosive adhesive gel was spread evenly and fixed to a thickness of 0.9 mm. Then, a metal halide lamp is used to irradiate the composition for an electrocorrosive adhesive gel with ultraviolet rays having an energy amount of 3000 mJ / cm ² , and a 0.9 mm thick sheet of the anticorrosive adhesive gel (adhesive for electroprotection) Gel sheet) was obtained.

[Example 2]
Example 1 except that the amount of the reactive phosphate ester type surfactant (ADEKA rear soap (registered trademark) PP-70) was changed to 0.1 parts by weight and the amount of glycerin was changed to 59.25 parts by weight. In the same manner as above, a sheet-like adhesive gel for anticorrosion (adhesive gel sheet for anticorrosion) was obtained.

Example 3
Example 1 except that the amount of the reactive phosphate ester type surfactant (ADEKA rear soap (registered trademark) PP-70) was changed to 0.5 parts by weight and the amount of glycerin was changed to 58.85 parts by weight. In the same manner as above, a sheet-like adhesive gel for anticorrosion (adhesive gel sheet for anticorrosion) was obtained.

[Examples 4 to 5]
Non-reactive phosphate ester type surfactant (Plysurf (registered trademark) A212C, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) instead of the reactive phosphate ester type surfactant (Adekaria Soap (registered trademark) PP-70) ) Was used in the same manner as in Examples 1 and 2 to obtain a sheet-like adhesive gel for anticorrosion (adhesive gel sheet for anticorrosion).

Example 6
Example 2 was used except that 15 parts by weight of acrylamide and 5 parts by weight of N, N-dimethylacrylamide were used as the nonionic monofunctional monomer, and the amount of glycerin was changed to 59.25 parts by weight. Thus, a sheet-like adhesive gel for anticorrosion (adhesive gel sheet for anticorrosion) was obtained.

Example 7
15 parts by weight of acrylamide and 5 parts by weight of acryloylmorpholine are used as the nonionic monofunctional monomer, and 59.25 parts by weight of polyoxypropylene polyglyceryl ether is used in place of 59.25 parts by weight of glycerin as the polyhydric alcohol. Except that, in the same manner as in Example 2, a sheet-like adhesive gel for anticorrosion (adhesive gel sheet for anticorrosion) was obtained.

Example 8
Example 2 except that 0.16 part by weight of divinylbenzene was used instead of 0.05 part by weight of N, N′-methylenebisacrylamide as the polyfunctional monomer, and the amount of glycerin was changed to 59.14 parts by weight. Similarly, a sheet-like adhesive gel for anticorrosion (adhesive gel sheet for anticorrosion) was obtained.

[Comparative Example 1]
Without using a reactive phosphate ester type surfactant (Adekalia Soap (registered trademark) PP-70), the amount of N, N′-methylenebisacrylamide was changed to 0.03 parts by weight, and the amount of glycerin was changed to 59. Except for changing to 37 parts by weight, a sheet-like adhesive gel for anticorrosion (adhesive gel sheet for anticorrosion) was obtained in the same manner as in Example 1.

[Comparative Example 2]
In the same manner as in Example 1 except that the reactive phosphate ester type surfactant (Adekalia Soap (registered trademark) PP-70) was not used and the amount of glycerin was changed to 59.35 parts by weight, An anticorrosive adhesive gel (an anticorrosive adhesive gel sheet) was obtained.

[Comparative Example 3]
Without using a reactive phosphate ester type surfactant (Adekalia Soap (registered trademark) PP-70), the amount of N, N′-methylenebisacrylamide was changed to 0.06 parts by weight, and the amount of glycerin was changed to 59. Except for changing to 34 parts by weight, a sheet-shaped adhesive gel for anticorrosion (adhesive gel sheet for anticorrosion) was obtained in the same manner as in Example 1.

[Comparative Example 4]
Reactive sulfate ester type surfactant (polyoxyethylene-1- (allyloxymethyl) alkyl ether ammonium sulfate, trade name instead of reactive phosphate ester type surfactant (Adekalia Soap (registered trademark) PP-70)) Using “AQUALON (registered trademark) KH-10” (Daiichi Kogyo Seiyaku Co., Ltd.) and changing the amount of glycerin to 58.85 parts by weight, in the same manner as in Example 1, for sheet-shaped cathodic protection An adhesive gel (adhesive gel sheet for cathodic protection) was obtained.

(Swelling resistance evaluation)
The 0.9 mm thick adhesive gel for cathodic protection (adhesive gel sheet for cathodic protection) prepared in Examples 1 to 8 and Comparative Examples 1 to 4 was cut into a size of 30 mm width × 30 mm length, and weight ( Initial weight) was measured. Thereafter, the test piece was immersed in 40 ml of water for 24 hours, and the weight of the test piece after immersion (weight after 24 hours) was measured. Then, the weight after 24 hours was divided by the initial weight, and a value converted as a percentage (that is, (weight after 24 hours) / (initial weight) × 100 (unit:%)) was taken as the swelling rate.

  Further, when the swelling rate was 400% or less, the swelling resistance was evaluated as good (indicated by “◯” in Table 1), and when the swelling rate exceeded 400%, the swelling resistance was poor (Table 1). Then, it was evaluated as “×”. Table 1 shows the results of the evaluation of swelling resistance of the adhesive gels for anticorrosion prepared in Examples 1 to 8 and Comparative Examples 1 to 4, together with the compositions of Examples 1 to 8 and Comparative Examples 1 to 4.

[Measurement of initial adhesive strength to zinc plate]
A 0.9 mm-thick adhesive gel for cathodic protection (adhesive gel sheet for cathodic protection) produced in Examples 1 to 8 and Comparative Examples 1 to 4 was cut into a size of 20 mm wide × 100 mm long to synthesize paper The test piece was lined with (Product name: Peach Coat (registered trademark), manufactured by Nisshinbo Holdings Inc., thickness 0.09 mm). This test piece was attached to a zinc plate (thickness 0.25 mm) and set on a texture analyzer ("TA-XT.Plus" manufactured by Stable Micro Systems). Then, the load at the time of peeling a test piece in a 90 degree direction at a speed | rate of 300 mm / min according to JISZ0237 was measured, and the measured load (N) was made into adhesive force.

  In addition, when the initial adhesive strength to the zinc plate was 1.5 N or more, the adhesiveness to the zinc plate was evaluated as good (indicated by “◯” in Table 1), and the initial adhesive strength to the zinc plate was 1 When it was less than 5 N, the adhesion to the zinc plate was evaluated as poor (indicated by “x” in Table 1). Table 1 shows the measurement results of the initial adhesive strength to the zinc plate of the adhesive gel for cathodic protection prepared in Examples 1 to 8 and Comparative Examples 1 to 4.

表１に示す結果より、実施例１〜８の電気防食用粘着性ゲルは、比較例１〜３の電気防食用粘着性ゲルと比べて、水に対する耐膨潤性と、金属に対する初期粘着力との両方に優れていることが認められた。

From the results shown in Table 1, the anticorrosive pressure-sensitive adhesive gels of Examples 1 to 8 are more resistant to swelling with respect to water and the initial pressure-sensitive adhesive force to metal than the anticorrosive pressure-sensitive adhesive gels of Comparative Examples 1 to 3. Both were found to be superior.

  Specifically, the adhesive gel for cathodic protection of Examples 1 to 8 to which a phosphate ester-type surfactant was added as a surfactant did not contain a phosphate ester-type surfactant, and was a polyfunctional single-agent. Compared to Comparative Example 1 with a small amount of the monomer, the swelling ratio with water was decreased, and it was confirmed that the swelling resistance to water was improved. On the other hand, the anticorrosive pressure-sensitive adhesive gels of Examples 1 to 8 to which a phosphate ester type surfactant was added as a surfactant did not contain a phosphate ester type surfactant as a surfactant, and were multifunctional. Compared with the adhesive gel for cathodic protection of Comparative Example 2 and Comparative Example 3 in which the amount of the monomer was large, it was recognized that the initial adhesive strength to metal was improved.

  Moreover, the adhesive gel for cathodic protection of Examples 1-8 to which a phosphate ester type surfactant was added had improved initial adhesive strength to metal compared to Comparative Example 4 to which a sulfate ester type surfactant was added. It was recognized that

  From the above, the anticorrosive pressure-sensitive adhesive gels of Examples 1 to 8, ie, the anticorrosive pressure-sensitive adhesive gel of the present invention, ensure sufficient swelling resistance to water and sufficient adhesion to metal. It was recognized that it was made.

  The adhesive gel for cathodic protection of the present invention can be particularly suitably used as a backfill used for adhesion between concrete and an anode metal in a method for cathodic corrosion of concrete by the galvanic anode method.

Claims (5)

An adhesive gel for anticorrosion containing a polymer matrix, water, an electrolyte, and a polyhydric alcohol,
Including a surfactant,
A nonionic monofunctional monomer having one polymerizable carbon-carbon double bond, and a polyfunctional monomer having two or more polymerizable carbon-carbon double bonds; A copolymer of
The adhesive gel for cathodic protection, wherein the surfactant is a phosphate ester type surfactant.   The phosphate ester type surfactant is a reactive phosphate ester type surfactant, and the polymer matrix has a non-ionic monofunctional monofunctional single polymer having one polymerizable carbon-carbon double bond. It consists of a copolymer of a monomer, a polyfunctional monomer having two or more polymerizable carbon-carbon double bonds, and the phosphate type surfactant. Adhesive gel for anticorrosion.   Nonionic monofunctional monomers include (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, dimethylaminopropyl (meth) The adhesive gel for cathodic protection according to claim 1 or 2, which is at least one selected from the group consisting of) acrylamide, hydroxyethyl (meth) acrylamide, and (meth) acryloylmorpholine.   The phosphoric acid ester type surfactant is contained in an amount of 0.01 to 1.00% by weight based on 100% by weight of the anticorrosive adhesive gel. Adhesive gel for anticorrosion.   The structural unit derived from the polyfunctional monomer is contained in an amount of 0.01 to 0.5% by weight with respect to 100% by weight of the anticorrosive pressure-sensitive adhesive gel. The adhesive gel for cathodic protection according to Item.