Carbon-dioxide-fixing surface coating material, surface coating method for civil engineering structure and building structure, civil engineering structure, and building structure

Abstract

A carbon-dioxide-fixing surface coating material (10) according to the present invention comprises an adhesive layer (11), is used by being attached to a surface of a civil engineering structure or a building structure, and absorbs and fixes carbon dioxide in the atmosphere. A surface coating method according to the present invention includes a step of attaching the carbon-dioxide-fixing surface coating material (10) of the present invention to a surface of a civil engineering structure or a building structure. Another surface coating method according to the present invention includes: a step of attaching a carbon-dioxide-fixing surface coating material of the present invention composed of an adhesive layer to a surface of a civil engineering structure or a building structure; and a step of attaching a base material to a surface of the carbon-dioxide-fixing surface coating material attached to the civil engineering structure or the building structure. A civil engineering structure and a building structure according to the present invention have the carbon-dioxide-fixing surface coating material of the present invention attached thereto.

Description

Carbon dioxide fixation surface coating material, surface coating method for civil engineering structures and architectural structures, civil engineering structures, and architectural structures

[0001] The present invention relates to a carbon dioxide fixing surface coating material, a surface coating method for civil engineering structures and architectural structures, civil engineering structures, and architectural structures.

[0002] Since the Industrial Revolution, the use of fossil fuels has increased, resulting in an increase in the concentration of carbon dioxide in the atmosphere. Carbon dioxide in the atmosphere accelerates global warming, and in order to suppress the increase in the concentration of carbon dioxide in the atmosphere, it is desirable to reduce carbon dioxide emissions. In addition to reducing carbon dioxide emissions, methods for reducing the concentration of carbon dioxide in the atmosphere include absorbing carbon dioxide in the atmosphere. One method for absorbing carbon dioxide in the atmosphere is, for example, to apply a water glass paint composition capable of absorbing carbon dioxide to a substrate (see Patent Document 1). A coating film formed by applying a water glass paint composition to a substrate absorbs carbon dioxide and forms polymerized silica. This allows the coating film to absorb carbon dioxide in the atmosphere.

[0003] International Publication No. 2012 / 077344

[0004] However, when attempting to form a coating film that absorbs atmospheric carbon dioxide using the water glass coating composition described in Patent Document 1, problems arise in that it takes a certain amount of time to apply the coating, the penetration depth of the coating is not uniform, and therefore the amount of carbon dioxide absorbed is not constant. Therefore, an object of the present invention is to provide a carbon dioxide fixing surface coating material that can easily and efficiently form a film that absorbs atmospheric carbon dioxide, a surface coating method for civil engineering structures and architectural structures that uses the carbon dioxide fixing surface coating material, and civil engineering structures and architectural structures that use the carbon dioxide fixing surface coating material.

[0005] As a result of extensive research, the present inventors have found that the above-mentioned problems can be solved by applying an adhesive tape that absorbs atmospheric carbon dioxide instead of applying a paint that absorbs atmospheric carbon dioxide, and have thus completed the present invention. The present invention provides the following [1] to

[12] . [1] A carbon dioxide-fixing surface covering material that has an adhesive layer, is used by being attached to the surface of a civil engineering structure or an architectural structure, and absorbs and fixes atmospheric carbon dioxide. [2] When the carbon dioxide absorption amount of the carbon dioxide-fixing surface covering material is measured by the following carbon dioxide absorption amount measurement method, the carbon dioxide absorption amount per unit volume of the carbon dioxide-fixing surface covering material 24 hours after the start of measurement is 3 kg / m ３ The carbon dioxide fixation surface coating material according to claim 1, wherein the carbon dioxide fixation surface coating material is a coating material having a carbon dioxide fixation amount that is measured by a method of measuring the amount of carbon dioxide absorbed by the surface coating material in an environment of 23°C. ２ The carbon dioxide fixing surface coating material and the CO ２ With the concentration meter inside the desiccator, the desiccator was evacuated to -0.040 MPa, and then a carbon dioxide gas cylinder was connected to the desiccator. ２ was injected until the internal pressure of the desiccator reached 0.000 MPa, and the CO in the desiccator 10 minutes after the start of injection ２ CO measured with a concentration meter ２ The CO concentration in the desiccator 24 hours after the initial concentration measurement was taken as the initial concentration. ２ The concentration of CO ２ The concentration is measured with a concentration meter, and the amount of carbon dioxide absorbed per unit volume of the carbon dioxide fixing surface covering material is calculated using the following formula (1). where P is the standard atmospheric pressure (101,325 Pa), Vd is the volume of the desiccator (7 L), R is the gas constant (8,310 Pa L / (K mol)), T is the measurement temperature (296 K), and ΔD is the CO 2 concentration in the desiccator after 24 hours. ２ Concentration and CO in the desiccator ２ is the difference in concentration (vol%) between the initial concentration and the final concentration, and Vs is the volume (m ３). [3] The carbon dioxide-fixing surface-covering material according to [1] or [2] above, wherein the pressure-sensitive adhesive layer contains one or more types of carbon dioxide fixatives. [4] The carbon dioxide-fixing surface-covering material according to [3] above, wherein the carbon dioxide fixative is a basic compound. [5] The carbon dioxide-fixing surface-covering material according to [3] or [4] above, wherein the carbon dioxide fixative is a hydroxide of an alkaline earth metal. [6] The carbon dioxide-fixing surface-covering material according to any one of [3] to [5] above, wherein the carbon dioxide fixative is calcium hydroxide. [7] The carbon dioxide-fixing surface-covering material according to any one of [1] to [6] above, wherein the pressure-sensitive adhesive layer has a thickness of 100 μm or more. [8] The carbon dioxide-fixing surface-covering material according to any one of [1] to [7] above, wherein the pressure-sensitive adhesive layer is formed from a photocurable resin. [9] The carbon dioxide-fixing surface-covering material according to any one of [1] to [8] above, wherein the pressure-sensitive adhesive layer is formed from an acrylic pressure-sensitive adhesive.

[10] The carbon dioxide-fixing surface-covering material according to any one of [1] to [9] above, further comprising a substrate.

[11] A surface coating method for civil engineering structures and architectural structures, comprising a step of attaching the carbon dioxide fixing surface coating material according to any one of [1] to

[10] above to the surface of the civil engineering structure or architectural structure.

[12] The surface coating method according to

[11] above, further comprising a step of attaching a substrate to the surface of the civil engineering structure or architectural structure opposite to the surface side of the carbon dioxide fixing surface coating material attached to the civil engineering structure or the architectural structure.

[13] A civil engineering structure to which the carbon dioxide fixing surface coating material according to any one of [1] to

[10] above has been attached.

[14] An architectural structure to which the carbon dioxide fixing surface coating material according to any one of [1] to

[10] above has been attached.

[0006] According to the present invention, it is possible to provide a carbon dioxide fixing surface coating material that can simply and efficiently form a film that absorbs carbon dioxide in the atmosphere, a surface coating method for civil engineering structures and architectural structures that uses the carbon dioxide fixing surface coating material, and civil engineering structures and architectural structures that use the carbon dioxide fixing surface coating material.

[0007] Fig. 1 is a schematic diagram showing an example of the configuration of a carbon dioxide fixation surface covering material of the present invention. Fig. 2 is a schematic diagram showing an example of the configuration of a carbon dioxide fixation surface covering material of the present invention.

[0008] [Carbon Dioxide Fixing Surface Coating Material] The carbon dioxide fixation surface coating material of the present invention has an adhesive layer and is attached to the surface of a civil engineering structure or architectural structure to absorb and fix atmospheric carbon dioxide. This allows the carbon dioxide fixation surface coating material of the present invention to easily and efficiently form a film that absorbs atmospheric carbon dioxide. Absorbing and fixing atmospheric carbon dioxide refers to the carbon dioxide fixation surface coating material reacting with atmospheric carbon dioxide to generate a reaction product and retaining the reaction product within the carbon dioxide fixation surface coating material, or the carbon dioxide fixation surface coating material adsorbing atmospheric carbon dioxide and retaining the adsorbed carbon dioxide within the carbon dioxide fixation surface coating material. Furthermore, the carbon dioxide fixation surface coating material of the present invention can inhibit deterioration of civil engineering structures and architectural structures due to the intrusion of deteriorating factors such as chloride ions, thereby extending the lifespan of civil engineering structures and architectural structures.

[0009] (Adhesive Layer) <Adhesive> The adhesive layer is preferably formed from an adhesive. The type of adhesive is not particularly limited, but examples include acrylic adhesives, rubber adhesives, urethane adhesives, and silicone adhesives. These may be used alone or in combination. Among these, the adhesive layer is preferably formed from an acrylic adhesive. Use of an acrylic adhesive makes it easier to control the molecular weight of the adhesive, increases the flexibility of the adhesive, and makes it easier to follow the irregularities on the adherend surface, making it easier to attach the carbon dioxide fixing surface coating material to the surface of a civil engineering structure or an architectural structure.

[0010] The pressure-sensitive adhesive layer is preferably formed from a photocurable resin. That is, the pressure-sensitive adhesive layer may be formed by photocuring a photocurable pressure-sensitive adhesive composition as described below. By forming the pressure-sensitive adhesive layer from a photocurable resin, it is possible to appropriately cure the pressure-sensitive adhesive layer. Furthermore, by using a photocurable resin for the pressure-sensitive adhesive layer, it is easy to form a thick film of 100 μm or more. By forming the pressure-sensitive adhesive layer into a thick film, it is possible to attach the pressure-sensitive adhesive layer to the surface of a civil engineering structure or an architectural structure with high adhesive strength, thereby making it possible to protect the surface of the civil engineering structure or the architectural structure for a long period of time. Among photocurable resins, the pressure-sensitive adhesive layer is more preferably formed from an acrylic pressure-sensitive adhesive. Note that, for a pressure-sensitive adhesive layer formed from a photocurable resin, a photocurable main polymer constituting the pressure-sensitive adhesive may be used. For example, in the case of an acrylic pressure-sensitive adhesive, the acrylic polymer may be photocurable.

[0011] (Acrylic pressure-sensitive adhesive) The acrylic pressure-sensitive adhesive is a pressure-sensitive adhesive containing an acrylic polymer obtained by polymerizing a polymerizable monomer containing a (meth)acrylic acid alkyl ester monomer (A). In this specification, the term "(meth)acrylic acid alkyl ester" refers to a concept including both an acrylic acid alkyl ester and a methacrylic acid alkyl ester, and the same applies to other similar terms. In addition, the term "polymerizable monomer" refers to a concept that can include not only compounds that do not have a repeating unit, but also compounds that can copolymerize with a (meth)acrylic acid alkyl ester monomer (A), such as the olefin polymer (C) described below, that have a repeating unit themselves.

[0012] ((Meth)acrylic acid alkyl ester monomer (A)) The (meth)acrylic acid alkyl ester monomer (A) is an ester of (meth)acrylic acid and an aliphatic alcohol, and is preferably an alkyl ester derived from an aliphatic alcohol in which the number of carbon atoms in the alkyl group of the aliphatic alcohol is preferably 2 to 14, more preferably 4 to 10. When the number of carbon atoms in the alkyl group is within this range, the adhesive strength is easily increased, and the storage modulus at 23°C of the adhesive, which will be described later, is easily adjusted to a predetermined range.

[0013] Specific examples of the (meth)acrylic acid alkyl ester monomer (A) include ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, and tetradecyl (meth)acrylate. Among these, n-butyl(meth)acrylate, hexyl(meth)acrylate, heptyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, and n-octyl(meth)acrylate are preferred, and 2-ethylhexyl(meth)acrylate is more preferred. The (meth)acrylic acid alkyl ester monomers may be used alone or in combination of two or more.

[0014] The structural unit derived from the (meth)acrylic acid alkyl ester monomer (A) constitutes the main component of the pressure-sensitive adhesive layer, and its content is generally 30% by mass or more, preferably 40% by mass or more, and more preferably 50% by mass or more, based on the total amount of the pressure-sensitive adhesive layer. Increasing the content of the (meth)acrylic acid alkyl ester monomer (A) thus makes it possible to impart a desired adhesive strength to the pressure-sensitive adhesive layer. Furthermore, the content of the structural unit derived from the (meth)acrylic acid alkyl ester monomer (A) is, for example, 95% by mass or less, preferably 90% by mass or less, and more preferably 80% by mass or less, in order to contain a certain amount or more of other components. The content of the structural unit derived from the (meth)acrylic acid alkyl ester monomer (A) in the pressure-sensitive adhesive layer is substantially the same as the content of the (meth)acrylic acid alkyl ester monomer (A) in the pressure-sensitive adhesive composition described below, and can therefore be expressed interchangeably. The same applies to components other than component (A), such as components (B) and (C) described below.

[0015] (Polar Group-Containing Vinyl Monomer (B)) The polymerizable monomer preferably contains a polar group-containing vinyl monomer (B) in addition to the (meth)acrylic acid alkyl ester-based monomer (A). The polar group-containing vinyl monomer (B) has a polar group and a vinyl group. Use of the polar group-containing monomer (B) makes it easier to improve the adhesive strength to the adherend. Examples of the polar group-containing vinyl monomer (B) include carboxylic acid vinyl esters such as vinyl acetate, carboxylic acids containing a vinyl group such as (meth)acrylic acid and itaconic acid, and anhydrides thereof, vinyl monomers having a hydroxyl group such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, caprolactone-modified (meth)acrylate, polyoxyethylene (meth)acrylate, and polyoxypropylene (meth)acrylate, and nitrogen-containing vinyl monomers such as (meth)acrylonitrile, N-vinylpyrrolidone, N-vinylcaprolactam, N-vinyllaurolactam, (meth)acryloylmorpholine, (meth)acrylamide, dimethyl(meth)acrylamide, N-methylol(meth)acrylamide, N-butoxymethyl(meth)acrylamide, and dimethylaminomethyl (meth)acrylate. From the viewpoint of adhesion to steel structures, among these, vinyl group-containing carboxylic acids such as (meth)acrylic acid and itaconic acid, and their anhydrides, and nitrogen-containing vinyl monomers such as (meth)acryloylmorpholine are preferred, (meth)acrylic acid and (meth)acryloylmorpholine are more preferred, and acrylic acid is even more preferred. Furthermore, from the viewpoint of adhesion to concrete structures, among these, nitrogen-containing vinyl monomers such as (meth)acryloylmorpholine are preferred, (meth)acryloylmorpholine is more preferred, and acryloylmorpholine (ACMO) is even more preferred. These polar group-containing vinyl monomers (B) may be used alone or in combination of two or more.

[0016] When a polar group-containing vinyl monomer (B) is used, the content of the structural units derived from the polar group-containing vinyl monomer (B) in the pressure-sensitive adhesive layer is preferably 1 to 20 parts by mass, more preferably 1 to 15 parts by mass, even more preferably 2 to 15 parts by mass, still more preferably 2 to 12 parts by mass, even more preferably 3 to 12 parts by mass, and still more preferably 3 to 10 parts by mass, per 100 parts by mass of the structural units derived from the (meth)acrylic acid alkyl ester monomer (A). By setting the content of the polar group-containing vinyl monomer (B) within this range, the adhesive strength of the carbon dioxide fixing surface coating material is easily improved.

[0017] (Olefin Polymer (C)) The polymerizable monomer preferably further contains an olefin polymer (C) having a polymerizable bond at one end. Use of such an olefin polymer (C) makes it easier to improve the adhesive strength of the carbon dioxide fixing surface coating material. The polymerizable bond means an unsaturated carbon-carbon bond that can be polymerized with the polymerizable monomer, and examples thereof include unsaturated double bonds, preferably (meth)acryloyl groups. Examples of the olefin polymer (C) include polyolefins having a (meth)acryloyl group at one end. The polyolefin is a polymer of an aliphatic hydrocarbon compound having a double bond, such as ethylene, propylene, butane, butadiene, or isoprene, or a hydrogenated product thereof.

[0018] Examples of polyolefins having a (meth)acryloyl group at one end include polyethylene having a (meth)acryloyl group at one end, which is prepared by reacting polyethylene having an epoxy group at one end with (meth)acrylic acid. Also included are polybutadiene having a (meth)acryloyl group at one end or hydrogenated products thereof, and examples of commercially available products include "L-1253" manufactured by Kuraray Co., Ltd.

[0019] The olefin polymer (C) preferably has a number average molecular weight of 500 to 20,000, more preferably 1,000 to 10,000. The number average molecular weight may be measured by gel permeation chromatography (GPC) and calculated using a calibration curve of standard polystyrene. The content of the structural units derived from the olefin polymer (C) in the pressure-sensitive adhesive layer is preferably 1 to 20 parts by mass, more preferably 2 to 15 parts by mass, and even more preferably 4 to 12 parts by mass, per 100 parts by mass of the structural units derived from the (meth)acrylic acid alkyl ester monomer (A).

[0020] (Crosslinking Agent (D)) The polymerizable monomer preferably further contains a crosslinking agent. Examples of the crosslinking agent include polyfunctional monomers having two or more vinyl groups, and preferably polyfunctional (meth)acrylates having two or more (meth)acryloyl groups. Use of a polyfunctional monomer makes it easier to adjust the adhesive strength of the pressure-sensitive adhesive layer to an appropriate range. The polyfunctional (meth)acrylate is not particularly limited, and examples thereof include bifunctional alkyl (meth)acrylates such as hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethoxylated bisphenol A di(meth)acrylate, tris(2-hydroxyethyl)isocyanurate triacrylate, ethoxylated trimethylolpropane triacrylate, proxilated trimethylolpropane triacrylate, proxilated glyceryl triacrylate, neopentyl glycol adipate diacrylate, and the like, as well as polymers such as polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, and liquid hydrogenated 1,2-polybutadiene di(meth)acrylate. Among these polyfunctional (meth)acrylates, polymers are preferred, and liquid hydrogenated 1,2-polybutadiene diacrylate is more preferred. Commercially available liquid hydrogenated 1,2-polybutadiene diacrylates include "TEAI-1000" manufactured by Nippon Soda Co., Ltd. Bifunctional alkyl (meth)acrylates are also preferred, and commercially available products include A-HD-N from the NK Ester series manufactured by Shin-Nakamura Chemical Co., Ltd. The content of the crosslinking agent-derived structural units in the pressure-sensitive adhesive layer is preferably 0.005 to 1 part by mass, more preferably 0.01 to 0.1 parts by mass, and even more preferably 0.02 to 0.08 parts by mass, per 100 parts by mass of the structural units derived from the (meth)acrylic acid alkyl ester monomer (A).

[0021] (Tackifier Resin) The acrylic pressure-sensitive adhesive may contain a tackifier resin to improve adhesive strength. Preferred tackifier resins include those with low polymerization inhibition properties, such as hydrogenated terpene resins, hydrogenated rosins, disproportionated rosin resins, and petroleum resins. Among these, hydrogenated tackifier resins are preferred, as tackifier resins containing many double bonds inhibit polymerization reactions, and hydrogenated petroleum resins are particularly preferred. The softening point of the tackifier resin should be approximately 95°C or higher to improve the cohesive strength and adhesive strength of the pressure-sensitive adhesive, but preferably includes tackifier resins with a softening point of 120°C or higher. For example, a tackifier resin with a softening point of 95°C or higher but lower than 120°C may be used in combination with a tackifier resin with a softening point of 120°C or higher but lower than 150°C. The softening point may be measured by the ring and ball method specified in JIS K2207. The content of the tackifier resin in the acrylic pressure-sensitive adhesive is preferably 5 to 40 parts by mass, more preferably 7 to 35 parts by mass, and even more preferably 10 to 25 parts by mass, per 100 parts by mass of the structural units derived from the (meth)acrylic acid alkyl ester monomer (A).

[0022] (Microparticles) The acrylic pressure-sensitive adhesive may contain microparticles. The inclusion of microparticles can improve adhesive strength. Examples of the microparticles include inorganic hollow particles such as glass balloons, shirasu balloons, and fly ash balloons; organic hollow particles made of polymethyl methacrylate, acrylonitrile-vinylidene chloride copolymer, polystyrene, and phenolic resin; inorganic microparticles such as glass beads, silica beads, and synthetic mica; and organic microparticles such as polyethyl acrylate, polyurethane, polyethylene, and polypropylene. The content of the microparticles in the acrylic pressure-sensitive adhesive is preferably 0.1 to 15 parts by mass, more preferably 0.5 to 10 parts by mass, and even more preferably 0.7 to 7 parts by mass, per 100 parts by mass of the structural units derived from the (meth)acrylic acid alkyl ester monomer (A).

[0023] (Other Components) In addition to the components described above, the acrylic pressure-sensitive adhesive used in the pressure-sensitive adhesive layer may contain various additives conventionally used in pressure-sensitive adhesives, such as plasticizers, softeners, pigments, dyes, polymerization initiators, flame retardants, and thickeners.

[0024] (Rubber-Based Pressure-Sensitive Adhesive) Next, the rubber-based pressure-sensitive adhesive used in the pressure-sensitive adhesive layer will be described. The rubber-based pressure-sensitive adhesive contains a rubber component and a tackifying resin, and it is preferable to use a styrene-isoprene block copolymer as the rubber component. The styrene-isoprene block copolymer preferably has a diblock ratio of 25 to 70% by mass, more preferably 30 to 65% by mass, and even more preferably 45 to 60% by mass. Here, diblock refers to a diblock composed of styrene and isoprene. By setting the diblock ratio within the above range, it becomes easier to increase adhesive strength. In addition to diblocks, styrene-isoprene block copolymers also include those having three or more blocks, such as triblocks composed of styrene, isoprene, and styrene blocks.

[0025] The amount of styrene in the styrene-isoprene block copolymer is not particularly limited, but is preferably 14 to 24% by mass, more preferably 15 to 18% by mass. If the styrene amount is 14% by mass or more, the resulting adhesive tends to have high cohesive strength. Furthermore, if the styrene amount is 24% by mass or less, the cohesive strength becomes moderate and adhesive strength is easily exerted. The molecular weight of the styrene-isoprene block copolymer is not particularly limited, but is preferably 100,000 to 400,000 in mass average molecular weight, more preferably 150,000 to 250,000. The mass average molecular weight referred to here refers to the molecular weight measured as polystyrene equivalent by GPC (gel permeation chromatography) method.

[0026] Various tackifying resins can be used in rubber-based pressure-sensitive adhesives, but petroleum-based resins, terpene resins, and coumarone resins are preferred. Tackifying resins may be used alone or in combination. However, it is preferable to use a petroleum-based resin in combination with at least one selected from terpene resins and coumarone resins. This combination of tackifying resins facilitates improved adhesive strength. Examples of petroleum-based resins include aliphatic petroleum resins (C5 petroleum resins), alicyclic petroleum resins, and aromatic petroleum resins. From the perspective of compatibility with styrene-isoprene block copolymers, aliphatic petroleum resins are preferred. Furthermore, it is preferable to use petroleum-based resins with a softening point of approximately 90 to 120°C. Furthermore, terpene resins with a softening point of approximately 80 to 120°C can be used, but those below 100°C are preferred from the perspective of ensuring adhesive strength. Furthermore, to ensure cohesive strength, coumarone resins with a softening point of preferably 110 to 130°C, more preferably 115 to 125°C, are used.

[0027] The amount of the tackifier resin is preferably 60 to 250 parts by mass, more preferably 100 to 200 parts by mass, and even more preferably 110 to 180 parts by mass, per 100 parts by mass of the rubber component. By setting the blending amount of the tackifier resin within the above range, it is possible to improve the cohesive strength and impart appropriate adhesive strength. Furthermore, when a petroleum-based resin is used in combination with at least one selected from a terpene resin and a coumarone resin, the amount of the petroleum-based resin is preferably 50 to 200 parts by mass, more preferably 60 to 150 parts by mass, and more preferably 60 to 110 parts by mass, per 100 parts by mass of the rubber component. Meanwhile, the amount of the terpene resin is preferably 10 to 70 parts by mass, more preferably 20 to 60 parts by mass, and even more preferably 30 to 50 parts by mass, per 100 parts by mass of the rubber component. Furthermore, the amount of the coumarone resin is preferably 10 to 60 parts by mass, more preferably 15 to 50 parts by mass, and even more preferably 20 to 40 parts by mass, per 100 parts by mass of the rubber component. The rubber-based adhesive may contain the above-mentioned fine particles, as in the acrylic-based adhesive, and may also contain a softener, an antioxidant, a filler, etc., as necessary.

[0028] (Urethane-Based Pressure-Sensitive Adhesive) The urethane-based pressure-sensitive adhesive is not particularly limited, and examples thereof include urethane resins obtained by reacting at least a polyol with a polyisocyanate compound. Examples of the polyol include polyether polyols, polyester polyols, polycarbonate polyols, and polycaprolactone polyols. Examples of the polyisocyanate compounds include diphenylmethane diisocyanate, tolylene diisocyanate, and hexamethylene diisocyanate. These urethane-based pressure-sensitive adhesives may be used alone or in combination of two or more. Furthermore, examples of the urethane-based pressure-sensitive adhesive include urethane resins obtained by reacting a polyurethane polyol with a polyfunctional isocyanate curing agent. Examples of polyurethane polyols include those obtained by reacting the above-mentioned polyols with a polyisocyanate compound, or those obtained by reacting a polyol, a polyisocyanate compound, and a chain extender such as a diamine. The polyfunctional isocyanate curing agent may be any compound having two or more isocyanate groups, and the above-mentioned isocyanate compounds can be used. The urethane-based adhesive may contain the above-mentioned fine particles in addition to the urethane resin, and may also contain a tackifying resin, a softener, an antioxidant, a filler, etc., as necessary.

[0029] (Silicone-based adhesive) Examples of silicone-based adhesives include addition reaction type, peroxide curing type, and condensation reaction type silicone-based adhesives. Among them, addition reaction type silicone-based adhesives are preferably used from the viewpoint of being curable at low temperature in a short time. Note that addition reaction type silicone-based adhesives are cured when the adhesive layer is formed. When an addition reaction type silicone-based adhesive is used as the silicone-based adhesive, the silicone-based adhesive may contain a catalyst such as a platinum catalyst. Furthermore, the silicone-based adhesive may contain fine particles, and a crosslinking agent and various additives for controlling adhesive strength may be added.

[0030] (Carbon Dioxide Fixing Agent) The pressure-sensitive adhesive layer preferably contains one or more carbon dioxide fixatives. This allows the carbon dioxide fixation surface coating material of the present invention to easily absorb and fix carbon dioxide in the atmosphere. Examples of carbon dioxide fixatives include amines such as monoethanolamine, methyldiethanolamine, 2-amino-2-methyl-1-propanol, piperazine, and polyethyleneimine; alkaline earth metal hydroxides such as magnesium hydroxide, calcium hydroxide, strontium hydroxide, and barium hydroxide; alkaline earth metal oxides such as magnesium oxide and calcium oxide; alkali metal hydroxides such as lithium hydroxide, sodium hydroxide, and potassium hydroxide; aluminosilicates such as zeolites; mesoporous silica; and silica gel. These carbon dioxide fixatives can be used alone or in combination of two or more. Among these carbon dioxide fixatives, basic compounds are preferred, alkaline earth metal hydroxides are preferred, and calcium hydroxide is more preferred. The calcium hydroxide is preferably dispersed in particulate form in the pressure-sensitive adhesive layer. In the present invention, by using calcium hydroxide, the photocuring property of the pressure-sensitive adhesive composition is less likely to be inhibited, and the deterioration of the adhesive performance of the pressure-sensitive adhesive layer due to the carbon dioxide fixation agent can also be suppressed. Calcium hydroxide reacts with carbon dioxide in the atmosphere to form calcium carbonate, and the generated calcium carbonate is retained in the carbon dioxide fixation surface coating material. In the present invention, by using calcium hydroxide, carbon dioxide can be efficiently fixed in the pressure-sensitive adhesive layer. In addition,

[0031] The content of the carbon dioxide fixative is preferably 5 parts by mass or more per 100 parts by mass of the total content of the adhesive components excluding the carbon dioxide fixative from all components constituting the adhesive layer. When the content of the carbon dioxide fixative is 5 parts by mass or more, the carbon dioxide absorption ability of the carbon dioxide fixative surface coating material can be sufficiently enhanced. From this perspective, the content of the carbon dioxide fixative is more preferably 10 parts by mass or more, and even more preferably 15 parts by mass or more, per 100 parts by mass of the total content of the adhesive components excluding the carbon dioxide fixative. Furthermore, the content of the carbon dioxide fixative is preferably 80 parts by mass or less, per 100 parts by mass of the total content of the adhesive components excluding the carbon dioxide fixative. When the content of the carbon dioxide fixative is 80 parts by mass or less, it is possible to prevent the adhesive strength of the adhesive layer from being reduced or the photocuring property from being suppressed by the carbon dioxide fixative. From this perspective, the content of the carbon dioxide fixative is more preferably 70 parts by mass or less, and even more preferably 60 parts by mass or less, per 100 parts by mass of the total content of the adhesive components excluding the carbon dioxide fixative.

[0032] (Thickness) The thickness of the pressure-sensitive adhesive layer is preferably 100 μm or more. By making the thickness 100 μm or more, the adhesive strength of the carbon dioxide fixing surface coating material can be further improved. From this viewpoint, the thickness of the pressure-sensitive adhesive layer is more preferably 250 μm or more, even more preferably 300 μm or more, and even more preferably 500 μm or more. There are no particular limitations on the upper limit of the thickness of the pressure-sensitive adhesive layer, but from the viewpoint of improving the adhesive strength of the carbon dioxide fixing surface coating material according to the thickness and preventing a decrease in workability due to an increase in weight, it is, for example, 2000 μm, and 1200 μm is preferred.

[0033] (90° Peel Adhesion) The 90° peel adhesion of the pressure-sensitive adhesive layer to mortar is preferably 5 N / 15 mm or more. A 90° peel adhesion of 5 N / 15 mm or more further improves adhesion to adherends such as civil engineering structures and architectural structures. From this perspective, the 90° peel adhesion of the pressure-sensitive adhesive layer is more preferably 10 N / 15 mm or more, even more preferably 12 N / 15 mm or more, and even more preferably 20 N / 15 mm or more. The higher the 90° peel adhesion of the pressure-sensitive adhesive layer, the better, but it is usually 100 N / 15 mm or less. The 90° peel adhesion of the pressure-sensitive adhesive layer can be measured by the method described in the Examples below. The 90° peel adhesion of the pressure-sensitive adhesive layer can be adjusted to a desired range by adjusting the composition of the pressure-sensitive adhesive.

[0034] (Storage Modulus) The storage modulus of the pressure-sensitive adhesive layer at a temperature of 23°C is preferably 50,000 to 1,000,000 Pa. When the storage modulus at a temperature of 23°C is within the above range, the adhesive strength of the pressure-sensitive adhesive tape is increased, and the protective performance of the pressure-sensitive adhesive tape against an adherend is easily improved. From this perspective, the storage modulus of the pressure-sensitive adhesive layer at a temperature of 23°C is more preferably 100,000 to 800,000 Pa, and even more preferably 200,000 to 700,000 Pa. The storage modulus of the pressure-sensitive adhesive layer at a temperature of 23°C can be measured by the method described in the Examples below. The storage modulus of the pressure-sensitive adhesive layer at a temperature of 23°C can be adjusted by the composition of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer.

[0035] (Method for Producing Pressure-Sensitive Adhesive Layer) Hereinafter, a case where the pressure-sensitive adhesive layer is formed using a photocurable acrylic pressure-sensitive adhesive will be described. However, known methods can also be used to produce pressure-sensitive adhesive layers formed using other pressure-sensitive adhesives. The acrylic pressure-sensitive adhesive forming the pressure-sensitive adhesive layer can be obtained by irradiating a photocurable pressure-sensitive adhesive composition containing the above-mentioned polymerizable monomer with light to polymerize the polymerizable monomer. Here, the pressure-sensitive adhesive composition may contain at least one of a carbon dioxide fixative, and optionally a tackifier resin, microparticles, and other components. More specifically, the polymerizable monomer, the carbon dioxide fixative, and optionally a tackifier resin, microparticles, and other components are first introduced into a reaction vessel such as a glass vessel and mixed to obtain a pressure-sensitive adhesive composition. Next, to remove dissolved oxygen from the pressure-sensitive adhesive composition, an inert gas such as nitrogen gas is generally supplied to purge the oxygen. The pressure-sensitive adhesive composition is then applied to a release sheet or a substrate such as a resin film, woven fabric, or nonwoven fabric, and then irradiated with light to polymerize the polymerizable monomer, thereby obtaining a pressure-sensitive adhesive layer. The steps from application or impregnation of the pressure-sensitive adhesive composition to the step of irradiating with light are preferably carried out in an inert gas atmosphere or in a state where oxygen is blocked by a film, etc. In the present production method, the pressure-sensitive adhesive composition obtained by mixing the components may be pre-polymerized before being applied to a release sheet, a substrate, or the like in order to increase the viscosity.

[0036] (Substrate) The carbon dioxide immobilizing surface coating material of the present invention may further include a substrate. When a substrate is provided, the pressure-sensitive adhesive layer may be provided on at least one side of the substrate. The substrate in the carbon dioxide immobilizing surface coating material of the present invention is not particularly limited, and examples thereof include sheet-like materials such as resin films, nonwoven fabrics, and metal foils. Examples of resin films include acrylic films, polyester films such as PET (polyethylene terephthalate) films, fluororesin films, polyvinyl chloride films, AES resin films, and ASA resin films. Examples of nonwoven fabrics include nonwoven fabrics made of synthetic resin fibers such as polyamides, polyesters, polyacrylics, polyolefins, and polyurethanes. Examples of metal foils include metal foils of iron and its alloys, metal foils of metals with a lower electric potential than iron, such as chromium, zinc, titanium, aluminum, and magnesium, and metal foils of metals with a higher electric potential than iron, such as gold, silver, copper, tin, nickel, and cobalt. These sheet-like materials can be used alone or in combination of two or more. From the viewpoint of protecting the pressure-sensitive adhesive layer, the substrate is preferably a resin film, more preferably an acrylic film, a PET film, or a fluororesin film, and even more preferably an acrylic film. In the case of a resin film, the interfacial strength can be easily increased by modifying the surface of the substrate by corona treatment or by providing an undercoat layer.

[0037] The thickness of the substrate is not particularly limited, but is preferably 10 to 500 μm, more preferably 30 to 400 μm, and even more preferably 40 to 300 μm. When the substrate has a thickness of 10 μm or more, it can function as a support. Furthermore, when the thickness is 500 μm or less, it is easy to improve adhesion to civil engineering structures and architectural structures.

[0038] The surface of the substrate facing the PSA layer may be subjected to surface modification by corona treatment, which can further increase the interfacial strength between the substrate and the PSA layer in the carbon dioxide fixing surface covering material.

[0039] (Total Light Transmittance) The total light transmittance of the carbon dioxide-fixing surface-coating material having a substrate is preferably 30% or more. When the total light transmittance of the carbon dioxide-fixing surface-coating material having a substrate is 30% or more, the adherend can be visually recognized through the carbon dioxide-fixing surface-coating material. From this perspective, the total light transmittance of the carbon dioxide-fixing surface-coating material having a substrate is more preferably 40% or more, even more preferably 50% or more, and even more preferably 60% or more. The upper limit of the range of the total light transmittance of the carbon dioxide-fixing surface-coating material having a substrate is not particularly limited, but is usually 100% or less. The total light transmittance of the carbon dioxide-fixing surface-coating material having a substrate may be measured in accordance with JIS K 7361 by laminating a specified release PET film to the surface of the carbon dioxide-fixing surface-coating material opposite to the surface on which the substrate is provided. Specifically, the total light transmittance of the carbon dioxide-fixing surface-coating material having a substrate can be measured by the method described in the Examples below. The total light transmittance can be adjusted by the composition of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, the thickness of the pressure-sensitive adhesive layer, the composition of the substrate, the thickness of the substrate, etc.

[0040] (Undercoat layer) The carbon dioxide fixing surface coating material of the present invention preferably further comprises an undercoat layer on the surface of the substrate facing the pressure-sensitive adhesive layer. This can further improve the interfacial strength between the substrate and the pressure-sensitive adhesive layer. The undercoat can be formed by applying an undercoat paint to the substrate and drying it as necessary.

[0041] (Coating film) The carbon dioxide fixing surface covering material of the present invention preferably further comprises a coating film provided on the surface of the substrate opposite to the surface on the pressure-sensitive adhesive layer side. This can further improve the weather resistance of the carbon dioxide fixing surface covering material of the present invention. The coating film can be formed by applying a paint to the substrate and drying it as necessary.

[0042] When the carbon dioxide absorption amount of the carbon dioxide immobilizing surface coating material of the present invention is measured by the following carbon dioxide absorption amount measurement method, the carbon dioxide absorption amount per unit volume of the carbon dioxide immobilizing surface coating material of the present invention after 24 hours from the start of measurement is preferably 3 kg / m ３<Method for measuring carbon dioxide absorption> In an environment of 23°C, the carbon dioxide fixing surface coating material was measured to determine whether it absorbed carbon dioxide on the inner surface of a desiccator or CO ２ The carbon dioxide fixing surface coating material and the CO ２ With the concentration meter placed in the desiccator, the desiccator is evacuated to -0.040 MPa (gauge pressure). Then, a carbon dioxide gas cylinder is connected to the desiccator, and CO ２ CO (component concentration 99.5 vol% or more) is injected into the desiccator until the internal pressure reaches 0.000 MPa (gauge pressure). ２ CO measured with a concentration meter ２ The CO concentration in the desiccator was measured 24 hours after the initial concentration was measured in a 23°C environment. ２ The concentration of CO ２ The carbon dioxide absorption amount per unit volume of the carbon dioxide fixing surface coating material is calculated using the following formula (1). ２ As the concentration meter, for example, a product name "High Concentration Combustible Gas Detector XP-3140" manufactured by New Cosmos Electric Co., Ltd. may be used. where P is the standard atmospheric pressure (101,325 Pa), Vd is the volume of the desiccator (7 L), R is the gas constant (8,310 Pa L / (K mol)), T is the measurement temperature (296 K), and ΔD is the CO 2 concentration in the desiccator after 24 hours. ２ Concentration and CO in the desiccator ２ is the difference in concentration (vol%) between the initial concentration and the final concentration, and Vs is the volume (m ３ ) In addition, when the carbon dioxide fixation surface-coating material has a substrate, the substrate of the carbon dioxide fixation surface-coating material may be in contact with the inner surface of the desiccator or the CO ２ The carbon dioxide fixing surface coating material and the CO ２ Place the densitometer in a desiccator.

[0043] The carbon dioxide absorption capacity per unit volume of the carbon dioxide fixing surface coating material is 3 kg / m ３If the carbon dioxide fixation surface coating material has the above-mentioned properties, it will have a sufficient carbon dioxide absorption capacity. From this viewpoint, the carbon dioxide absorption amount per unit volume of the carbon dioxide fixation surface coating material of the present invention is more preferably 10 kg / m ３ More preferably, it is 18 kg / m ３ The higher the carbon dioxide absorption amount per unit volume of the carbon dioxide fixing surface coating material, the better, but the upper limit is, for example, 500 kg / m ３ The amount of carbon dioxide absorbed per unit volume of the carbon dioxide fixing surface covering material can be adjusted by the type and content of the carbon dioxide fixing agent contained in the carbon dioxide fixing surface covering material.

[0044] (Civil Engineering Structures and Architectural Structures) The civil engineering structures and architectural structures to which the carbon dioxide fixation surface coating material of the present invention is attached are preferably either concrete structures or steel structures. When the carbon dioxide fixation surface coating material is attached to either a concrete structure or a steel structure, the civil engineering structure and the architectural structure can be appropriately protected. Note that concrete structures and steel structures refer to various structures that use concrete, reinforcing bars, steel frames, tension steel, etc., such as railway and road bridges, tunnels, chimneys, and buildings, and the specific targets are not particularly limited.

[0045] (Configuration of Carbon Dioxide Fixing Surface Coating Material) The carbon dioxide fixation surface coating material may consist of only an adhesive layer. Alternatively, as shown in Fig. 1, the carbon dioxide fixation surface coating material 10 may be a single-sided adhesive tape having a substrate 12 and an adhesive layer 11 provided on one side of the substrate 12. This allows the adhesive layer 11 to be protected by the substrate 12. The carbon dioxide fixation surface coating materials in each drawing are used by being attached to civil engineering structures and architectural structures with the surface 11A of the adhesive layer 11 as the adhesive surface.

[0046] When the carbon dioxide fixing surface-covering material is composed of only a pressure-sensitive adhesive layer, the carbon dioxide fixing surface-covering material is a double-sided pressure-sensitive adhesive tape. However, as shown in Figure 2, even when the carbon dioxide fixing surface-covering material has a substrate 12, pressure-sensitive adhesive layers 11 may be provided on both sides of the substrate 12 so that the carbon dioxide fixing surface-covering material 10 is a double-sided pressure-sensitive adhesive tape.

[0047] Furthermore, before the carbon dioxide fixing surface covering material 10 is attached to an adherend (a civil engineering structure or an architectural structure), a release sheet (not shown) may be attached to the surface of the pressure-sensitive adhesive layer 11, which is the surface that is attached to the adherend. The release sheet is preferably peeled off before the carbon dioxide fixing surface covering material 10 is attached to the adherend. By providing the release sheet, the surface that is to be attached of the carbon dioxide fixing surface covering material 10 is appropriately protected. The release sheet may be made of a resin film alone, or may be a resin film with one surface that has been subjected to a release treatment, or may be release paper or the like.

[0048] (Method of Using the Carbon Dioxide Fixing Surface Coating Material of the Present Invention) The carbon dioxide fixation surface coating material of the present invention may be directly attached to a civil engineering structure or an architectural structure. However, it is preferable to coat the surface of the civil engineering structure or architectural structure with a primer paint, and then, while the primer paint applied to the civil engineering structure or architectural structure is still wet, to attach the carbon dioxide fixation surface coating material of the present invention onto the primer layer formed from the primer paint.

[0049] The primer coating preferably contains an epoxy resin. Epoxy resins have excellent adhesion to concrete structures and can provide high-level concrete spalling prevention. Here, the epoxy resin is preferably a resin having at least two epoxy groups per molecule, such as one obtained by reacting a polyhydric alcohol or polyhydric phenol with a halohydrin. Specific examples include bisphenol A epoxy resins, halogenated bisphenol A epoxy resins, novolac epoxy resins, polyglycol epoxy resins, bisphenol F epoxy resins, epoxidized oils, 1,6-hexanediol diglycidyl ether, and neopentyl glycol diglycidyl ether. Modified versions of these epoxy resins, such as amine-modified epoxy resins, isocyanate-modified epoxy resins, acrylic-modified epoxy resins, urethane-modified epoxy resins, and polyester-modified epoxy resins, are also included. These epoxy resins may be used alone or in combination of two or more.

[0050] The above primer coating may contain other components, such as other resins, curing agents, pigments, thickeners, rust inhibitors, dispersants, antifoaming agents, leveling agents, anti-settling agents, anti-sagging agents, curing accelerators, anti-algae agents, anti-mold agents, preservatives, ultraviolet absorbers, and light stabilizers, as needed.

[0051] The means for applying the primer coating is not particularly limited, and known coating means such as brush coating, roller coating, trowel coating, spatula coating, flow coater coating, and spray coating (e.g., aerosol spray coating, air spray coating, airless spray coating, etc.) can be used.

[0052] [Surface Coating Method for Civil Engineering Structures and Architectural Structures] The surface coating method for civil engineering structures and architectural structures of the present invention comprises a step of applying the carbon dioxide-fixing surface coating material of the present invention to the surface of the civil engineering structure or architectural structure. This makes it efficient to enable the civil engineering structure or architectural structure to absorb and fix carbon dioxide in the atmosphere. Note that the carbon dioxide-fixing surface coating material, civil engineering structure, and architectural structure of the present invention have already been explained in the section on carbon dioxide-fixing surface coating material, so explanation of the carbon dioxide-fixing surface coating material, civil engineering structure, and architectural structure of the present invention will be omitted.

[0053] Another surface coating method for civil engineering structures and architectural structures of the present invention includes the steps of attaching the carbon dioxide-fixing surface coating material of the present invention, which comprises an adhesive layer, to the surface of the civil engineering structure or architectural structure, and attaching a substrate to the surface of the civil engineering structure or architectural structure opposite the surface of the carbon dioxide-fixing surface coating material attached to the civil engineering structure or architectural structure. This makes it efficient to enable the civil engineering structure or architectural structure to absorb and fix carbon dioxide from the atmosphere. Note that the carbon dioxide-fixing surface coating material, adhesive layer, substrate, civil engineering structure, and architectural structure of the present invention have already been described in the section on carbon dioxide-fixing surface coating material, so a detailed description of the carbon dioxide-fixing surface coating material, adhesive layer, substrate, civil engineering structure, and architectural structure of the present invention will be omitted. However, according to this method, the substrate can be easily changed depending on the type of adherend and its intended use. For example, a substrate with a design feature may be used for decorating the civil engineering structure or architectural structure. Furthermore, in this method, an example was described in which the carbon dioxide-fixing surface coating material consists of an adhesive layer alone. However, any carbon dioxide fixation surface covering material may be used as long as a substrate can be attached to the surface opposite to the surface of the carbon dioxide fixation surface covering material attached to the civil engineering structure or architectural structure. For example, a double-sided pressure-sensitive adhesive tape having pressure-sensitive adhesive layers on both sides of the substrate may be used.

[0054] [Civil engineering structure and architectural structure] The civil engineering structure of the present invention is one to which the carbon dioxide-fixing surface covering material of the present invention is attached, and the architectural structure of the present invention is one to which the carbon dioxide-fixing surface covering material of the present invention is attached. Note that the carbon dioxide-fixing surface covering material, civil engineering structure, and architectural structure of the present invention have already been explained in the section on the carbon dioxide-fixing surface covering material, so explanation of the carbon dioxide-fixing surface covering material, civil engineering structure, and architectural structure of the present invention will be omitted.

[0055] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples.

[0056] [Evaluation method]

[0057] In the examples and comparative examples, the carbon dioxide fixing surface coating material was evaluated by the following evaluation method. (Method for measuring carbon dioxide absorption amount) The carbon dioxide fixing surface coating material attached to the SUS plate and the CO ２ The desiccator was evacuated to a vacuum of -0.040 MPa (gauge pressure) with a concentration meter (manufactured by New Cosmos Electric Co., Ltd., product name "High Concentration Combustible Gas Detector XP-3140") placed inside. At this time, the carbon dioxide fixing surface coating material adhered to the inner surface of the desiccator and CO ２ In addition, when the carbon dioxide fixing surface-coating material has a substrate, the surface of the substrate of the carbon dioxide fixing surface-coating material is placed so as not to come into contact with the inner surface of the desiccator or the CO ２ The carbon dioxide gas cylinder was then connected to the desiccator, and CO was poured into the desiccator. ２ CO (component concentration 99.5 vol % or more) was injected until the internal pressure of the desiccator reached 0.000 MPa (gauge pressure). ２ CO measured with a concentration meter ２ The CO concentration in the desiccator 24 hours after the initial concentration measurement was taken as the initial concentration. ２ The concentration of CO ２ The measurement was carried out with a concentration meter, and the amount of carbon dioxide absorbed per unit volume of the carbon dioxide fixing surface coating material was calculated using the following formula (1): The evaluation was carried out in an environment of 23°C. where P is the standard atmospheric pressure (101,325 Pa), Vd is the volume of the desiccator (7 L), R is the gas constant (8,310 Pa L / (K mol)), T is the measurement temperature (296 K), and ΔD is the CO 2 concentration in the desiccator after 24 hours. ２ Concentration and CO in the desiccator ２ is the difference in concentration (vol%) between the initial concentration and the final concentration, and Vs is the volume (m ３ ) <Evaluation criteria> A: 18 kg / m ３ More than B: 3kg / m ３ More than C: 3kg / m ３ less than

[0058] (90° Peel Adhesion of Adhesive Layer) A film was laminated onto the adhesive used in the adhesive layer of the carbon dioxide fixation surface coating material to prepare a measurement adhesive sheet comprising a film and an adhesive layer on one side of the film. The film may be any film that is resistant to stretching and does not break at the interface between the film and the adhesive during adhesive strength measurement. For this measurement, a primer-treated PET film was used. The obtained measurement adhesive sheet was cut to a width of 15 mm and a length of 100 mm to prepare a measurement sample. The measurement sample was attached to the following standard mortar plate via the adhesive layer in an environment of 23°C and 50% RH, and then cured for three days in an environment of 23°C and 50% RH. For bonding to the mortar, a 2 kg roller was moved back and forth twice at a speed of 10±0.5 mm / s. The measurement sample, which had been cured for three days, was then fixed to the chuck of a tensile tester (manufactured by A&D Co., Ltd., product name "Tensilon Universal Testing Machine"). Thereafter, in an environment of 23°C and 50% RH, the PSA sheet was pulled at a peel angle of 90° and a speed of 300 mm / min for 60 mm or more, and the average value of the load (N) detected by the load cell was recorded and used as the 90° peel adhesive strength. (Reference Mortar Board) A reference mortar board was prepared as follows. A mortar board (compliant with JIS R 5201, width 70 mm, length 150 mm) was prepared. Dust adhering to the surface of the prepared mortar board was removed using masking tape. At this time, OPP tape (manufactured by Sekisui Chemical Co., Ltd., product name "Tough Light Tape No. 835") was attached to the surface of the mortar board, and the OPP tape was then peeled off from the surface of the mortar board. The OPP tape was then attached to the release surface of a release PET (polyethylene terephthalate) film (thickness 50 μm) to prepare a sample, and dust removal was carried out until the total light transmittance reached 87%. The mortar board from which dust had been removed as described above was used as a reference mortar board, and the 90-degree peel adhesive strength of the adhesive layer relative to the reference mortar board was measured.

[0059] (Storage Modulus of Pressure-Sensitive Adhesive Layer) The storage modulus of the pressure-sensitive adhesive layer was calculated by measuring the dynamic viscoelastic spectrum using a DVA-200 (manufactured by IT Measurement & Control Co., Ltd.) under the following conditions: shear mode: 10 Hz, strain: 0.1%, temperature range: −50° C. to 200° C., and heating rate: 6° C. / min.

[0060] (Total Light Transmittance of Carbon Dioxide Fixing Surface Covering Material Equipped with Substrate) A release PET film ((polyethylene terephthalate) film: manufactured by Lintec Corporation, product name "PET5002") was laminated onto the pressure-sensitive adhesive layer of a carbon dioxide fixing surface covering material equipped with a substrate. Thereafter, the total light transmittance of the carbon dioxide fixing surface covering material laminated with release PET was measured in accordance with JIS K 7361 using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "Haze Meter NDH4000") in an atmosphere of 23°C and humidity of 50%.

[0061] [Examples 1, 3, 5, 7, 9, 11, Comparative Example 1] Pressure-sensitive adhesive compositions were prepared according to the formulations shown in Tables 1 and 2. Nitrogen was purged into the pressure-sensitive adhesive compositions to remove dissolved oxygen. Next, the pressure-sensitive adhesive compositions were applied to a release-treated PET film, which was then covered with another release-treated PET film. In this state, the ultraviolet irradiation intensity was 0.5 mW / cm. 2 The lamp intensity of the chemical lamp was adjusted so that the adhesive composition was cured by irradiating it with ultraviolet light for 5 minutes. The above procedure resulted in a carbon dioxide fixing surface coating material consisting of a single adhesive layer. The results are shown in Tables 1 and 2. The carbon dioxide fixing surface coating material was evaluated after peeling it from the PET film.

[0062] [Examples 2, 4, 6, 8, 10, 12 to 15, Comparative Example 2] Pressure-sensitive adhesive compositions were prepared according to the formulations shown in Tables 1 and 2. Nitrogen was purged into the pressure-sensitive adhesive compositions to remove dissolved oxygen. Next, the pressure-sensitive adhesive compositions were applied to a release-treated PET film, which was then covered with another release-treated PET film. In this state, the ultraviolet irradiation intensity was 0.5 mW / cm 2The lamp intensity of the chemical lamp was adjusted so that the adhesive composition was cured by irradiating ultraviolet light for 5 minutes. Next, one side of the release-treated PET film was peeled off, and the substrate shown in Tables 1 and 2 was laminated to the adhesive side. By the above procedure, a carbon dioxide fixing surface coating material consisting of a substrate and an adhesive layer was obtained. The carbon dioxide fixing surface coating material was also peeled off from the other PET film and evaluated. The results are shown in Tables 1 and 2.

[0063]

[0064]

[0065] The components in Tables 1 and 2 are as follows: Olefin polymer: Product name "L-1253" manufactured by Kuraray Co., Ltd., hydrogenated polybutadiene having a (meth)acryloyl group at one end; Tackifier resin 1: Product name "Arcon P140" manufactured by Arakawa Chemical Industries, Ltd., hydrogenated petroleum resin, softening point 140°C; Tackifier resin 2: Product name "Arcon P100" manufactured by Arakawa Chemical Industries, Ltd., hydrogenated petroleum resin, softening point 100°C; Crosslinker: NK Ester A-HD-N, bifunctional alkyl acrylate manufactured by Shin-Nakamura Chemical Co., Ltd.; Polymerization initiator: 2,2-dimethoxy-2-phenylacetophenone; Acrylic film 1: Product name "Soft Acrylic Sheet" manufactured by Tatsuta Chemical Co., Ltd.; Acrylic film 2: Product name "Acryplene™ MTXA45" manufactured by Mitsubishi Chemical Corporation; Carbon dioxide fixative: Calcium hydroxide manufactured by Kanto Chemical Co., Ltd., product number 07069-00.

[0066] A comparison of the carbon dioxide-fixing surface-coating materials of Examples 1 to 15 and the carbon dioxide-fixing surface-coating materials of Comparative Examples 1 and 2 revealed that the carbon dioxide-fixing surface-coating materials can absorb and fix carbon dioxide in the atmosphere because the pressure-sensitive adhesive layer contains a carbon dioxide fixating agent. Furthermore, the carbon dioxide-fixing surface-coating materials of Examples 2, 4, 6, 8, 10, and 12 to 15 revealed that even if the carbon dioxide-fixing surface-coating materials have a base material, they can absorb and fix carbon dioxide in the atmosphere.

[0067] 10 Carbon dioxide fixing surface coating material 11 Adhesive layer 12 Base material

Claims

1. A carbon dioxide fixing surface coating material that has an adhesive layer and is attached to the surface of a civil engineering or architectural structure to absorb and fix carbon dioxide in the atmosphere.

2. When the carbon dioxide absorption amount of the carbon dioxide fixing surface coating material is measured by the carbon dioxide absorption amount measurement method described below, the carbon dioxide absorption amount per unit volume of the carbon dioxide fixing surface coating material 24 hours after the start of measurement is 3 kg / m ３ The carbon dioxide fixation surface coating material according to claim 1, wherein the carbon dioxide absorption amount is measured by measuring the amount of carbon dioxide absorbed by the surface coating material ... ２ The carbon dioxide fixing surface coating material and the CO ２ With the concentration meter in the desiccator, the desiccator was evacuated to -0.040 MPa, and then a carbon dioxide gas cylinder was connected to the desiccator. ２ was injected until the internal pressure of the desiccator reached 0.000 MPa, and the CO in the desiccator 10 minutes after the start of injection was measured. ２ CO measured with a concentration meter ２ The CO concentration in the desiccator 24 hours after the initial concentration measurement was taken as the initial concentration. ２ Concentration of CO ２ The concentration is measured using a concentration meter, and the amount of carbon dioxide absorbed per unit volume of the carbon dioxide fixing surface coating material is calculated using the following formula (1). Here, P is the standard atmospheric pressure (101325 Pa), Vd is the volume of the desiccator (7 L), R is the gas constant (8310 Pa L / (K mol)), T is the measurement temperature (296 K), and ΔD is the CO ２ Concentration and CO in the desiccator ２ is the difference between the initial and final concentrations (vol%), and Vs is the volume (m ３ ).

3. The carbon dioxide fixing surface coating material according to claim 1, wherein the adhesive layer contains one or more carbon dioxide fixing agents.

4. The carbon dioxide fixing surface coating material according to claim 3, wherein the carbon dioxide fixing agent is a basic compound.

5. The carbon dioxide fixing surface coating material according to claim 3, wherein the carbon dioxide fixing agent is a hydroxide of an alkaline earth metal.

6. The carbon dioxide fixing surface coating material according to claim 3, wherein the carbon dioxide fixing agent is calcium hydroxide.

7. The carbon dioxide fixing surface coating material according to claim 1, wherein the thickness of the adhesive layer is 100 μm or more.

8. The carbon dioxide fixing surface coating material according to claim 1, wherein the adhesive layer is formed from a photocurable resin.

9. The carbon dioxide fixing surface covering material according to claim 1, wherein the adhesive layer is formed from an acrylic adhesive.

10. The carbon dioxide fixing surface coating material according to claim 1, further comprising a substrate.

11. A surface coating method for civil engineering structures and architectural structures, comprising a step of attaching the carbon dioxide fixation surface coating material according to any one of claims 1 to 10 to the surface of the civil engineering structure or architectural structure.

12. A surface coating method as described in claim 11, further comprising a step of attaching a substrate to the surface of the civil engineering structure or architectural structure opposite the surface side of the carbon dioxide fixing surface coating material attached to the civil engineering structure or architectural structure.

13. A civil engineering structure to which the carbon dioxide fixation surface coating material according to any one of claims 1 to 10 has been affixed.

14. An architectural structure to which the carbon dioxide fixing surface coating material according to any one of claims 1 to 10 has been affixed.

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