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

Abstract

To provide a carbon-dioxide-fixing surface coating material enabling a film absorbing carbon dioxide in the atmospheric to be easily and efficiently formed, a surface coating construction method of a civil engineering structure and a building structure using the carbon-dioxide-fixing surface coating material, and a civil engineering structure and a building structure using the carbon-dioxide-fixing surface coating material.SOLUTION: A carbon-dioxide-fixing surface coating material (10) of the present invention is provided with an adhesive layer (11), and is used by being attached to a surface of a civil engineering structure or a building construction structure to fix carbon dioxide in the atmosphere. A surface coating construction method of the present invention includes a step of attaching the carbon-dioxide-fixing surface coating material (10) to a surface of a civil engineering structure or a building structure. Another surface coating construction method of the present invention includes: a step of attaching the carbon-dioxide-fixing surface coating material comprising the adhesive layer to a surface of a civil engineering structure or a building structure; and a step of attaching a substrate to a surface of the carbon-dioxide-fixing surface coating material attached the civil engineering structure or the building construction structure. A civil engineering structure and a building construction structure of the present invention are attached with the carbon-dioxide-fixing surface coating material of the present invention.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Since the Industrial Revolution, the use of fossil fuels has increased, and as a result, the concentration of carbon dioxide in the atmosphere has also been increasing. Carbon dioxide in the atmosphere promotes global warming, and in order to suppress the increase in the concentration of carbon dioxide in the atmosphere, it is desired to reduce the amount of carbon dioxide emissions. In addition, as a method for reducing the concentration of carbon dioxide in the atmosphere, in addition to reducing the amount of carbon dioxide emissions, there is a method of absorbing carbon dioxide in the atmosphere. As a method of absorbing carbon dioxide in the atmosphere, for example, there is a method of applying a water glass paint composition having the ability to absorb carbon dioxide to an object to be coated (see Patent Document 1). A coating film formed by applying a water glass paint composition to an object to be coated absorbs carbon dioxide to form polymerized silicic acid. Thereby, the coating film can absorb carbon dioxide in the atmosphere.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when attempting to form a coating film that absorbs carbon dioxide in the atmosphere using the water glass paint composition described in Patent Document 1, it takes a certain amount of time to apply the paint, and the penetration depth of the paint is not uniform. Therefore, there is a problem that 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 capable of easily and efficiently forming a film for absorbing carbon dioxide in the atmosphere, a surface coating method for civil engineering structures and building structures using the carbon dioxide-fixing surface coating material, and civil engineering structures and building structures using the carbon dioxide-fixing surface coating material.

Means for Solving the Problems

[0005] As a result of intensive studies, the present inventors have found that the above problems can be solved by attaching an adhesive tape that absorbs carbon dioxide in the atmosphere instead of applying a paint that absorbs carbon dioxide in the atmosphere, and have completed the present invention. The present invention provides the following [1] to

[12] . [1] A carbon dioxide-fixing surface coating material that has an adhesive layer and is used by being attached to the surface of a civil engineering structure or a building structure, and absorbs and immobilizes carbon dioxide in the atmosphere. [2] When the carbon dioxide absorption amount of the carbon dioxide-fixing surface coating 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 coating material at the time when 24 hours have elapsed since the start of measurement is 3 kg / m 3 The carbon dioxide-fixing surface coating material according to claim 1, which is the above. <Carbon Dioxide Absorption Amount Measurement Method> Under an environment of 23°C, with the carbon dioxide-fixing surface coating material in a state of being attached to a SUS plate so that the carbon dioxide-fixing surface coating material does not touch the inner surface of the desiccator or the CO2 concentration meter, the carbon dioxide-fixing surface coating material and the CO2 concentration meter are placed in the desiccator, the desiccator is evacuated to -0.040 MPa, then the carbon dioxide cylinder and the desiccator are connected, and CO2 is injected into the desiccator until the internal pressure of the desiccator becomes 0.000 MPa. The CO2 concentration measured by the CO2 concentration meter in the desiccator 10 minutes after the start of injection is used as the initial concentration, the CO2 concentration in the desiccator 24 hours after the measurement of the initial concentration is measured by the CO2 concentration meter, and the carbon dioxide absorption amount per unit volume of the carbon dioxide-fixing surface coating material is calculated using the following formula (1).

Number

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

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

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

[12] The surface coating method according to

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

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

[10] above is attached.

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

[10] above is attached.

Advantages of the Invention

[0006] According to the present invention, it is possible to provide a carbon dioxide fixation surface coating material capable of simply and efficiently forming a film that absorbs carbon dioxide in the atmosphere, a surface coating method for civil engineering structures and architectural structures using the carbon dioxide fixation surface coating material, and civil engineering structures and architectural structures using the carbon dioxide fixation surface coating material.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0008] [Carbon Dioxide Fixation Surface Coating Material] The carbon dioxide fixation surface coating material of the present invention includes an adhesive layer, is used by being attached to the surface of a civil engineering structure or an architectural structure, and absorbs and immobilizes carbon dioxide in the atmosphere. Thereby, the carbon dioxide fixation surface coating material of the present invention can simply and efficiently form a film that absorbs carbon dioxide in the atmosphere. Note that absorbing and immobilizing carbon dioxide in the atmosphere means that the carbon dioxide fixation surface coating material reacts with carbon dioxide in the atmosphere to generate a reaction product and holds the reaction product in the carbon dioxide fixation surface coating material, or that the carbon dioxide fixation surface coating material adsorbs carbon dioxide in the atmosphere and holds the adsorbed carbon dioxide in the carbon dioxide fixation surface coating material. Further, with the carbon dioxide fixation surface coating material of the present invention, it is also possible to suppress the deterioration of civil engineering structures and architectural structures caused by the intrusion of deterioration factors such as chloride ions and to extend the service life of civil engineering structures and architectural structures.

[0009] (Adhesive layer) <Adhesive The adhesive layer is preferably formed of an adhesive. The type of the adhesive is not particularly limited, and examples thereof 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 of an acrylic adhesive. By using an acrylic adhesive, it becomes easier to control the molecular weight of the adhesive, enhances the flexibility of the adhesive, and makes it easier to follow the unevenness of the adherend surface, and makes it easier to attach the carbon dioxide fixation surface coating material to the surfaces of civil engineering structures and building structures.

[0010] The adhesive layer is preferably formed of a photocurable resin. That is, the adhesive layer may be formed by photocuring a photocurable adhesive composition as described later. By forming the adhesive layer of a photocurable resin, it can be appropriately cured. In addition, by using a photocurable resin for the adhesive layer, it also becomes easy to form a thick film of 100 μm or more. By making the adhesive layer a thick film, it becomes possible to attach it to the surface of a civil engineering structure or a building structure with a high adhesive force, so that it becomes possible to protect the surface of the civil engineering structure or the building structure over a long period of time. Among the photocurable resins, the adhesive layer is more preferably formed of an acrylic adhesive. Note that for the adhesive layer formed of a photocurable resin, a photocurable one may be used as the main polymer constituting the adhesive. For example, in the case of an acrylic adhesive, an acrylic polymer may be made photocurable.

[0011] (Acrylic adhesive) An acrylic adhesive is an 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 “alkyl (meth)acrylate” refers to a concept including both alkyl acrylate and alkyl methacrylate, and the same applies to other similar terms. Further, the term “polymerizable monomer” refers to a concept including not only a compound having no repeating unit but also a compound copolymerizable with the alkyl (meth)acrylate monomer (A), and may include a monomer having a repeating unit such as the olefin polymer (C) described later.

[0012] ((meth)acrylate monomer (A)) The alkyl (meth)acrylate monomer (A) is an ester of (meth)acrylic acid and an aliphatic alcohol, and an alkyl ester derived from an aliphatic alcohol having an alkyl group with preferably 2 to 14 carbon atoms, more preferably 4 to 10 carbon atoms is preferred. When the number of carbon atoms of the alkyl group is within this range, it is easy to increase the adhesive strength, and it is easy to adjust the storage elastic modulus at 23°C of the adhesive described later to a predetermined range.

[0013] Specific examples of the alkyl (meth)acrylate 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. (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 in the pressure-sensitive adhesive layer, and its content is generally 30% by mass or more, preferably 40% by mass or more, more preferably 50% by mass or more based on the total amount of the pressure-sensitive adhesive layer. Thus, increasing the content of the (meth)acrylic acid alkyl ester monomer (A) makes it possible to impart a desired adhesive force to the pressure-sensitive adhesive layer. Further, the above 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, more preferably 80% by mass or less in order to contain a certain amount or more of other components. Note that since 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 later, it can be represented by replacement. The same applies to components other than the component (A) such as the 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 monomer (A). The polar group-containing vinyl monomer (B) has a polar group and a vinyl group. By using the polar group-containing monomer (B), it becomes easier to improve the adhesive force to the adherend. Examples of the polar group-containing vinyl monomer (B) include vinyl carboxylates such as vinyl acetate, carboxylic acids containing a vinyl group such as (meth)acrylic acid and itaconic acid, and their anhydrides, 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, nitrogen-containing vinyl monomers such as (meth)acrylonitrile, N-vinylpyrrolidone, N-vinylcaprolactam, N-vinyl laurolactam, (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, carboxylic acids containing a vinyl group 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. Further, 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 using the polar group-containing vinyl monomer (B), the content of the structural unit 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, still more preferably 2 to 15 parts by mass, even more preferably 2 to 12 parts by mass, even more preferably 3 to 12 parts by mass, even more preferably 3 to 10 parts by mass, based on 100 parts by mass of the structural unit derived from the (meth)acrylic acid alkyl ester monomer (A). By setting the content of the polar group-containing vinyl monomer (B) within such a range, it becomes easier to improve the adhesive strength of the carbon dioxide-fixing surface coating material.

[0017] (Olefin polymer (C)) The polymerizable monomer preferably further includes an olefin polymer (C) having a polymerizable bond at one end. By using such an olefin polymer (C), it becomes easier to improve the adhesive strength of the carbon dioxide-fixing surface coating material. Note that the polymerizable bond means an unsaturated carbon-carbon bond capable of polymerizing with the polymerizable monomer, for example, an unsaturated double bond, and preferably a (meth)acryloyl group or the like. 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, isoprene, or a hydrogenated product thereof.

[0018] Examples of the polyolefin having a (meth)acryloyl group at one end include polyethylene having a (meth)acryloyl group at one end prepared by reacting polyethylene having an epoxy group at one end with (meth)acrylic acid. Also, polybutadiene having a (meth)acryloyl group at one end or a hydrogenated product thereof can be mentioned, and commercially available products such as "L-1253" manufactured by Kuraray Co., Ltd. can be mentioned.

[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. In addition, the content of the structural unit 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 with respect to 100 parts by mass of the structural unit 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. When a polyfunctional monomer is used, it becomes 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 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, propoxylated trimethylolpropane triacrylate, propoxylated glyceryl triacrylate, neopentyl glycol adipate diacrylate, and in addition, 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 products of liquid hydrogenated 1,2-polybutadiene diacrylate include "TEAI-1000" manufactured by Nippon Soda Co., Ltd. Bifunctional alkyl (meth)acrylates are also preferred, and commercially available products include A-HD-N of the NK Ester series manufactured by Shin-Nakamura Chemical Co., Ltd. In addition, the content of the structural unit derived from the crosslinking agent in the pressure-sensitive adhesive layer is preferably 0.005 to 1 part by mass, more preferably 0.01 to 0.1 part by mass, and even more preferably 0.02 to 0.08 part by mass with respect to 100 parts by mass of the structural unit derived from the (meth)acrylic acid alkyl ester monomer (A).

[0021] (Adhesion-imparting resin) From the viewpoint of improving the adhesive strength, the acrylic pressure-sensitive adhesive may contain an adhesion-imparting resin. As the adhesion-imparting resin, adhesion-imparting resins with low polymerization inhibitory properties such as hydrogenated terpene resins, hydrogenated rosin, disproportionated rosin resins, and petroleum resins are preferred. Among these, since adhesion-imparting resins having many double bonds inhibit the polymerization reaction, hydrogenated resins are preferred, and among them, hydrogenated petroleum resins are preferred. The softening point of the tackifier resin may be about 95°C or higher from the viewpoint of improving the cohesive force and adhesive force of the adhesive, but preferably includes those of 120°C or higher. For example, those of 95°C or higher and less than 120°C and those of 120°C or higher and 150°C or lower may be used in combination. 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 adhesive is preferably 5 to 40 parts by mass, more preferably 7 to 35 parts by mass, and still more preferably 10 to 25 parts by mass with respect to 100 parts by mass of the structural unit derived from the (meth)acrylic acid alkyl ester monomer (A).

[0022] (Fine particles) The acrylic adhesive may contain fine particles. By containing fine particles, the adhesive force can be improved. Examples of the fine particles include inorganic hollow particles such as glass balloons, shirasu balloons, and fly ash balloons, organic hollow particles composed of polymethyl methacrylate, acrylonitrile-vinylidene chloride copolymer, polystyrene, and phenolic resin, inorganic fine particles such as glass beads, silica beads, and synthetic mica, and organic fine particles such as ethyl polyacrylate, polyurethane, polyethylene, and polypropylene. The content of the fine particles in the acrylic adhesive is preferably 0.1 to 15 parts by mass, more preferably 0.5 to 10 parts by mass, and still more preferably 0.7 to 7 parts by mass with respect to 100 parts by mass of the structural unit derived from the (meth)acrylic acid alkyl ester monomer (A).

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

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

[0025] The amount of styrene in the styrene-isoprene block copolymer is not particularly limited, but it is preferably 14 to 24% by mass, more preferably 15 to 18% by mass. When the amount of styrene is 14% by mass or more, it tends to become a pressure-sensitive adhesive with high cohesiveness. Also, when it is 24% by mass or less, the cohesive force becomes of an appropriate magnitude and it becomes easier to develop the adhesive strength. The molecular weight of the styrene-isoprene block copolymer is not particularly limited, but the mass average molecular weight is preferably 100,000 to 400,000, more preferably 150,000 to 250,000. Here, the mass average molecular weight refers to that measured as the polystyrene-equivalent molecular weight by the GPC (gel permeation chromatography) method.

[0026] As the tackifier resin used for the rubber-based pressure-sensitive adhesive, various tackifier resins can be used, but it is preferable to use a petroleum resin, a terpene resin, or a coumarone resin. The tackifier resin may be used alone or in combination of two or more, but it is preferable to use in combination a petroleum resin and at least one selected from terpene resins and coumarone resins. Such a combination of tackifier resins tends to improve the adhesive strength. Examples of petroleum resins include aliphatic petroleum resins (C5 petroleum resins), alicyclic petroleum resins, aromatic petroleum resins, etc. From the perspective of compatibility with styrene-isoprene block copolymers, aliphatic petroleum resins are preferred. Also, it is preferable to use petroleum resins having a softening point of about 90 to 120°C. As for terpene resins, those having a softening point of about 80 to 120°C can be used, but those having a softening point of less than 100°C are preferred from the perspective of ensuring adhesiveness. Also, as for coumarone resins, in order to ensure cohesive force, those having a softening point of preferably 110 to 130°C, more preferably 115 to 125°C are used.

[0027] 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 with respect to 100 parts by mass of the rubber component. By setting the blending amount of the tackifier resin within the above range, the cohesive force can be improved and an appropriate tack can be imparted. Also, when using a petroleum resin in combination with at least one selected from terpene resins and coumarone resins, the petroleum resin is preferably 50 to 200 parts by mass, more preferably 60 to 150 parts by mass, and even more preferably 60 to 110 parts by mass with respect to 100 parts by mass of the rubber component. On the other hand, 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 with respect to 100 parts by mass of the rubber component. Further, 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 with respect to 100 parts by mass of the rubber component. The rubber-based adhesive may contain the above-mentioned fine particles in the same manner as the acrylic-based adhesive, and the rubber-based adhesive may also contain a softening agent, an antioxidant, a filler, etc. as required.

[0028] (Urethane-based adhesive) The above-mentioned urethane-based pressure-sensitive adhesives are not particularly limited. For example, urethane resins obtained by reacting at least a polyol and a polyisocyanate compound can be mentioned. Examples of the above polyol include polyether polyol, polyester polyol, polycarbonate polyol, polycaprolactone polyol, and the like. Examples of the above polyisocyanate compound include diphenylmethane diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, and the like. These urethane pressure-sensitive adhesives may be used alone or in combination of two or more. In addition, as the urethane-based pressure-sensitive adhesive, a urethane resin obtained by reacting a polyurethane polyol and a polyfunctional isocyanate-based curing agent may be used. The polyurethane polyol may be one obtained by reacting the above-mentioned polyol and polyisocyanate compound, or one obtained by reacting a polyol, a polyisocyanate compound, and a chain extender such as diamine. The polyfunctional isocyanate-based curing agent may be a compound having two or more isocyanate groups, and the above-mentioned isocyanate compound can be used. The urethane-based pressure-sensitive adhesive may contain the above-mentioned fine particles in addition to the urethane resin, and the urethane-based pressure-sensitive adhesive may also contain, if necessary, a tackifier resin, a softening agent, an antioxidant, a filler, and the like.

[0029] (Silicone-based pressure-sensitive adhesive) In addition, examples of the silicone-based pressure-sensitive adhesive include addition reaction type, peroxide curing type, or condensation reaction type silicone-based pressure-sensitive adhesives. Among them, from the viewpoint of being curable at low temperature for a short time, the addition reaction type silicone-based pressure-sensitive adhesive is preferably used. The addition reaction type silicone-based pressure-sensitive adhesive cures when the pressure-sensitive adhesive layer is formed. When using an addition reaction type silicone-based pressure-sensitive adhesive as the silicone-based pressure-sensitive adhesive, the above silicone-based pressure-sensitive adhesive may contain a catalyst such as a platinum catalyst. In addition, the silicone-based pressure-sensitive adhesive may contain fine particles, and may also be added with a crosslinking agent and various additives for controlling the adhesive force.

[0030] (Carbon dioxide fixing agent) The adhesive layer preferably contains one or more carbon dioxide fixing agents. Thereby, the carbon dioxide fixing surface coating material of the present invention can easily absorb and immobilize carbon dioxide in the atmosphere. Examples of the carbon dioxide fixing agent include amines such as monoethanolamine, methyldiethanolamine, 2-amino-2-methyl-1-propanol, piperazine, and polyethyleneimine; hydroxides of alkaline earth metals such as magnesium hydroxide, calcium hydroxide, strontium hydroxide, and barium hydroxide; oxides of alkaline earth metals such as magnesium oxide and calcium oxide; hydroxides of alkali metals such as lithium hydroxide, sodium hydroxide, and potassium hydroxide; aluminosilicates such as zeolite; mesoporous silica; silica gel and the like. These carbon dioxide fixing agents can be used alone or in combination of two or more. Among these carbon dioxide fixing agents, basic compounds are preferred, hydroxides of alkaline earth metals are preferred, and calcium hydroxide is more preferred. Calcium hydroxide is preferably contained in a particulate form and dispersed in the adhesive layer. In the present invention, by using calcium hydroxide, it is difficult to inhibit the photocurability of the adhesive composition, and it is also possible to suppress the decrease in the adhesive performance of the adhesive layer due to the carbon dioxide fixing agent. In addition, calcium hydroxide reacts with carbon dioxide in the atmosphere to form calcium carbonate, and the generated calcium carbonate is retained in the carbon dioxide fixing surface coating material. In the present invention, by using calcium hydroxide, carbon dioxide can be efficiently fixed in the adhesive layer. Also,

[0031] The content of the carbon dioxide fixing agent is preferably 5 parts by mass or more with respect to 100 parts by mass in total of the content of the pressure-sensitive adhesive components excluding the carbon dioxide fixing agent from all the components constituting the pressure-sensitive adhesive layer. When the content of the carbon dioxide fixing agent is 5 parts by mass or more, the ability of the carbon dioxide fixing surface coating material to absorb carbon dioxide can be sufficiently enhanced. From such a viewpoint, the content of the carbon dioxide fixing agent is more preferably 10 parts by mass or more, and still more preferably 15 parts by mass or more, with respect to 100 parts by mass in total of the content of the pressure-sensitive adhesive components excluding the carbon dioxide fixing agent. Further, the content of the carbon dioxide fixing agent is preferably 80 parts by mass or less with respect to 100 parts by mass in total of the content of the pressure-sensitive adhesive components excluding the carbon dioxide fixing agent. When the content of the carbon dioxide fixing agent is 80 parts by mass or less, it is possible to prevent the adhesive strength of the pressure-sensitive adhesive layer from being reduced or the photocurability from being suppressed by the carbon dioxide fixing agent. From such a viewpoint, the content of the carbon dioxide fixing agent is more preferably 70 parts by mass or less, and still more preferably 60 parts by mass or less, with respect to 100 parts by mass in total of the content of the pressure-sensitive adhesive components excluding the carbon dioxide fixing agent.

[0032] (Thickness) The thickness of the pressure-sensitive adhesive layer is preferably 100 μm or more. By setting the thickness to 100 μm or more, the adhesive strength of the carbon dioxide fixing surface coating material can be further improved. From such a viewpoint, the thickness of the pressure-sensitive adhesive layer is more preferably 250 μm or more, still more preferably 300 μm or more, and even more preferably 500 μm or more. The upper limit of the thickness of the pressure-sensitive adhesive layer is not particularly limited, but from the viewpoint of obtaining the effect of improving the adhesive strength of the carbon dioxide fixing surface coating material according to the thickness and the reduction in workability due to the weight increase, it is, for example, 2000 μm, and 1200 μm is preferable.

[0033] (90-degree peel adhesive strength) The 90-degree peel adhesion of the adhesive layer to the mortar is preferably 5 N / 15 mm or more. When the 90-degree peel adhesion is 5 N / 15 mm or more, the adhesiveness to adherends such as civil engineering structures and building structures becomes even better. From such a viewpoint, the 90-degree peel adhesion of the adhesive layer is more preferably 10 N / 15 mm or more, still more preferably 12 N / 15 mm or more, and even more preferably 20 N / 15 mm or more. Although the higher the 90-degree peel adhesion of the adhesive layer is, the better, it is usually 100 N / 15 mm or less. The 90-degree peel adhesion of the adhesive layer can be measured by the method described in the examples below. The 90-degree peel adhesion of the adhesive layer can be adjusted to a desired range by adjusting the composition of the adhesive.

[0034] (Storage elastic modulus) The storage elastic modulus of the adhesive layer at a temperature of 23°C is preferably 50,000 to 1,000,000 Pa. When the storage elastic modulus at a temperature of 23°C is within the above range, it becomes easy to increase the adhesive strength of the adhesive tape and improve the protection performance against adherends in the adhesive tape. From such a viewpoint, the storage elastic modulus of the adhesive layer at a temperature of 23°C is more preferably 100,000 to 800,000 Pa, and still more preferably 200,000 to 700,000 Pa. Incidentally, the storage elastic modulus of the adhesive layer at a temperature of 23°C can be measured by the method described in the examples below. The storage elastic modulus of the adhesive layer at a temperature of 23°C can be adjusted by the composition of the adhesive constituting the adhesive layer.

[0035] (Method for manufacturing the adhesive layer) Hereinafter, the case where the adhesive constituting the adhesive layer is a photocurable acrylic adhesive will be described, but the case where it is formed of other adhesives can also be manufactured by a known method. The acrylic adhesive forming the adhesive layer can be obtained by irradiating light on a photocurable adhesive composition containing the above-described polymerizable monomer to polymerize the polymerizable monomer. Here, the adhesive composition may contain at least one of a carbon dioxide fixing agent, an adhesion-imparting resin, fine particles, and other components as required. More specifically, first, a polymerizable monomer, a carbon dioxide fixing agent, and, if necessary, a tackifier resin, fine particles, and other components are put into a reaction vessel such as a glass container and mixed to obtain an adhesive composition. Next, in order to remove dissolved oxygen in the adhesive composition, an inert gas such as nitrogen gas is generally supplied to purge oxygen. Then, the adhesive composition can be obtained by applying the adhesive composition onto a release sheet or, after applying it onto a substrate such as a resin film, a woven fabric, or a non-woven fabric, irradiating light to polymerize the polymerizable monomer. It is preferable to perform the steps from the application or impregnation of the adhesive composition to the irradiation of light in an inert gas atmosphere or in a state where oxygen is blocked by a film or the like. In addition, in this production method, the adhesive composition obtained by mixing the components may be pre-polymerized before being applied onto a release sheet or a substrate in order to increase its viscosity.

[0036] (Substrate) The carbon dioxide fixing surface coating material of the present invention may further include a substrate. When a substrate is provided, the adhesive layer may be provided on at least one surface side of the substrate. The substrate in the carbon dioxide fixing surface coating material of the present invention is not particularly limited, and examples thereof include sheet-like materials such as resin films, non-woven fabrics, and metal foils. Examples of the resin film include acrylic films, polyester films such as PET (polyethylene terephthalate) films, fluororesin films, polyvinyl chloride films, AES resin films, ASA resin films, and the like. The non-woven fabric is, for example, a non-woven fabric made of synthetic resin fibers such as polyamide-based, polyester-based, polyacrylic-based, polyolefin-based, and polyurethane-based fibers. Examples of the metal foil include metal foils of iron and its alloys, metal foils of metals having a lower potential than iron such as chromium, zinc, titanium, aluminum, and magnesium, and metal foils of metals having a higher 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 perspective of protecting the 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 surface strength can be easily increased by modifying the surface of the substrate by corona treatment or 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 is 10 μm or more, it can function as a support. Also, when it is 500 μm or less, the adhesion to civil engineering structures and building structures can be easily enhanced.

[0038] The surface of the substrate on the adhesive layer side may be surface-modified by corona treatment. Thereby, the interfacial strength between the substrate and the adhesive layer in the carbon dioxide fixation surface coating material can be further increased.

[0039] (Total light transmittance) The total light transmittance of the carbon dioxide-fixing surface coating material provided with a substrate is preferably 30% or more. When the total light transmittance of the carbon dioxide-fixing surface coating material provided with a substrate is 30% or more, the adherend can be visually recognized through the carbon dioxide-fixing surface coating material. From such a viewpoint, the total light transmittance of the carbon dioxide-fixing surface coating material provided with a substrate is more preferably 40% or more, still more preferably 50% or more, and still more preferably 60% or more. The upper limit value of the range of the total light transmittance of the carbon dioxide-fixing surface coating material provided with a substrate is not particularly limited, but is usually 100% or less. The total light transmittance of the carbon dioxide-fixing surface coating material provided with a substrate may be measured in accordance with JIS K 7361 by laminating a specified release PET on the surface opposite to the surface on which the substrate of the carbon dioxide-fixing surface coating material is provided. Specifically, the total light transmittance of the carbon dioxide-fixing surface coating material provided with a substrate can be measured by the method described in the following examples. It 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, and the like.

[0040] (Primer layer) The carbon dioxide-fixing surface coating material of the present invention preferably further includes a primer layer on the surface of the substrate on the pressure-sensitive adhesive layer side. Thereby, the interfacial strength between the substrate and the pressure-sensitive adhesive layer can be further improved. The primer can be formed by applying a primer paint to the substrate and drying it as necessary.

[0041] (Coating film) The carbon dioxide-fixing surface coating material of the present invention preferably further includes a coating film provided on the surface of the substrate opposite to the surface on the pressure-sensitive adhesive layer side. Thereby, the weather resistance of the carbon dioxide-fixing surface coating material of the present invention can be further improved. 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-fixing 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-fixing surface coating material of the present invention at the time when 24 hours have elapsed from the start of the measurement is preferably 3 kg / m3 The above is the case. <Method for Measuring Carbon Dioxide Absorption Amount> Under the environment of 23°C, with the carbon dioxide fixation surface coating material not touching the inner surface of the desiccator or the CO2 concentration meter, put the carbon dioxide fixation surface coating material in a state of being pasted on the SUS plate and the CO2 concentration meter into the desiccator, and evacuate the desiccator to -0.040 MPa (gauge pressure). Then, connect the carbon dioxide gas cylinder and the desiccator, and inject CO2 (component concentration 99.5 vol% or more) into the desiccator until the internal pressure of the desiccator reaches 0.000 MPa (gauge pressure). Under the environment of 23°C, take the CO2 concentration measured by the CO2 concentration meter in the desiccator 10 minutes after the start of injection as the initial concentration. Under the environment of 23°C, measure the CO2 concentration in the desiccator with the CO2 concentration meter 24 hours after the initial concentration measurement, and calculate the carbon dioxide absorption amount per unit volume of the carbon dioxide fixation surface coating material using the following formula (1). As the CO2 concentration meter, for example, a product named "High-concentration Combustible Gas Detector XP-3140" manufactured by Shin Cosmos Electric Co., Ltd. can be used. [Number] 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), ΔD is the concentration (vol%) of the difference between the CO2 concentration in the desiccator 24 hours after the start and the initial concentration of the CO2 concentration in the desiccator, and Vs is the volume (m 3 ) of the carbon dioxide fixation surface coating material put into the desiccator. In addition, when the carbon dioxide fixation surface coating material has a substrate, put the carbon dioxide fixation surface coating material in a state of being pasted on the SUS plate and the CO2 concentration meter into the desiccator so that the substrate of the carbon dioxide fixation surface coating material does not touch the inner surface of the desiccator or the CO2 concentration meter.

[0043] The carbon dioxide absorption amount per unit volume of the carbon dioxide fixation surface coating material is 3 kg / m 3In the above case, the carbon dioxide-fixing surface coating material will have sufficient carbon dioxide absorption capacity. From such a perspective, the carbon dioxide absorption amount per unit volume of the carbon dioxide-fixing surface coating material of the present invention is more preferably 10 kg / m 3 or more, and even more preferably 18 kg / m 3 or more. The higher the carbon dioxide absorption amount per unit volume of the carbon dioxide-fixing surface coating material, the more preferable it is, but the upper limit value is, for example, 500 kg / m 3 . The carbon dioxide absorption amount per unit volume of the carbon dioxide-fixing surface coating material can be adjusted by the type and content of the carbon dioxide-fixing agent contained in the carbon dioxide-fixing surface coating material.

[0044] (Civil engineering structures and building structures) The civil engineering structures and building structures to which the carbon dioxide-fixing surface coating material of the present invention is to be attached are preferably either concrete structures or steel structures. By attaching the carbon dioxide-fixing surface coating material to either a concrete structure or a steel structure and using it, the civil engineering structures and building structures can be appropriately protected. Note that the concrete structures and steel structures refer to various structures using concrete, reinforcing bars, steel frames, prestressed steel materials, etc., such as railway and road bridges, tunnels, chimneys, buildings, etc., and the specific objects are not particularly limited.

[0045] (Composition of the carbon dioxide-fixing surface coating material) The carbon dioxide-fixing surface coating material may consist only of an adhesive layer. Also, as shown in FIG. 1, the carbon dioxide-fixing surface coating material 10 may be a single-sided adhesive tape having a base material 12 and an adhesive layer 11 provided on one side of the base material 12. Thereby, the adhesive layer 11 can be protected by the base material 12. The carbon dioxide-fixing surface coating material in each drawing is used by being attached to civil engineering structures and building structures with the surface 11A of the adhesive layer 11 as the adhesion surface.

[0046] When the carbon dioxide-fixing surface coating material consists only of an adhesive layer, the carbon dioxide-fixing surface coating material becomes a double-sided adhesive tape. However, as shown in FIG. 2, even when the carbon dioxide-fixing surface coating material has a base material 12, adhesive layers 11 may be provided on both sides of the base material 12 so that the carbon dioxide-fixing surface coating material 10 becomes a double-sided adhesive tape.

[0047] Furthermore, before the carbon dioxide-fixing surface coating material 10 is attached to an adherend (civil engineering structure or building structure), a release sheet (not shown) may be attached to the surface of the adhesive layer 11, which is the bonding surface with the adherend. The release sheet may be peeled off before being attached to the adherend. By providing the release sheet, the bonding surface of the carbon dioxide-fixing surface coating material 10 is appropriately protected. The release sheet may be composed of a single resin film, or one surface of a resin film may be subjected to a release treatment, or it 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-fixing surface coating material of the present invention may be directly attached to civil engineering structures and building structures. However, it is preferable to apply a primer paint to the surfaces of civil engineering structures and building structures, and attach the carbon dioxide-fixing surface coating material of the present invention onto the primer layer formed from the primer paint while the primer paint applied on the civil engineering structures and building structures is in an undried state.

[0049] The above primer paint preferably contains an epoxy resin. Since the epoxy resin has excellent adhesion to concrete structures, it can provide a high level of concrete peeling prevention performance. Here, the epoxy resin is preferably a resin having at least two epoxy groups in one molecule, and is, for example, obtained by reacting a polyhydric alcohol or a polyhydric phenol with a halohydrin. Specific examples include bisphenol A type epoxy resin, halogenated bisphenol A type epoxy resin, novolak type epoxy resin, polyglycol type epoxy resin, bisphenol F type epoxy resin, epoxidized oil, 1,6-hexanediol diglycidyl ether, and neopentyl glycol diglycidyl ether. In addition, modified epoxy resins such as amine-modified epoxy resin, isocyanate-modified epoxy resin, acrylic-modified epoxy resin, urethane-modified epoxy resin, and polyester-modified epoxy resin, which are modified products of such epoxy resins, are also included. These epoxy resins may be used alone or in combination of two or more.

[0050] In the above primer paint, as other components, other resins, curing agents, pigments, thickeners, rust preventives, dispersants, antifoaming agents, leveling agents, anti-settling agents, anti-dripping agents, curing accelerators, algicides, fungicides, preservatives, ultraviolet absorbers, light stabilizers, etc. may be appropriately blended as necessary.

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

[0052] [Surface Coating Method for Civil and Architectural Structures] The surface coating method for civil engineering structures and building structures of the present invention includes the step of attaching the carbon dioxide fixation surface coating material of the present invention to the surface of a civil engineering structure or a building structure. This makes the work of enabling civil engineering structures and building structures to absorb and immobilize carbon dioxide in the atmosphere more efficient. Note that since the carbon dioxide fixation surface coating material, civil engineering structures, and building structures of the present invention have already been described in the item of the carbon dioxide fixation surface coating material, the description of the carbon dioxide fixation surface coating material, civil engineering structures, and building structures of the present invention will be omitted.

[0053] Another surface coating method for civil engineering structures and building structures of the present invention includes the step of attaching the carbon dioxide fixation surface coating material of the present invention composed of an adhesive layer to the surface of a civil engineering structure or a building structure, and the step of attaching a base material to the surface on the opposite side of the surface of the carbon dioxide fixation surface coating material attached to the civil engineering structure or the building structure on the surface side of the civil engineering structure or the building structure. This makes the work of enabling civil engineering structures and building structures to absorb and immobilize carbon dioxide in the atmosphere more efficient. Note that since the carbon dioxide fixation surface coating material, adhesive layer, base material, civil engineering structures, and building structures of the present invention have already been described in the item of the carbon dioxide fixation surface coating material, the description of the carbon dioxide fixation surface coating material, adhesive layer, base material, civil engineering structures, and building structures of the present invention will be omitted. However, according to this method, the base material can be easily changed depending on the type of adherend and the application. For example, for the decoration of civil engineering structures and building structures, a material having design properties may be used. Also, in this method, an example in which the carbon dioxide fixation surface coating material is a single adhesive layer has been described. However, as long as the base material can be attached to the surface on the opposite side of the surface of the carbon dioxide fixation surface coating material attached to the civil engineering structure or the building structure, any carbon dioxide fixation surface coating material may be used. For example, a double-sided adhesive tape having adhesive layers on both sides of the base material may be used.

[0054] [Civil engineering structures and building structures] The civil engineering structure of the present invention is one to which the carbon dioxide-fixing surface coating material of the present invention is attached, and the building structure of the present invention is one to which the carbon dioxide-fixing surface coating material of the present invention is attached. Note that since the carbon dioxide-fixing surface coating material, civil engineering structure, and building structure of the present invention have already been described in the section on the carbon dioxide-fixing surface coating material, the description of the carbon dioxide-fixing surface coating material, civil engineering structure, and building structure of the present invention will be omitted.

Examples

[0055] Hereinafter, the present invention will be described in more detail 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. (Carbon Dioxide Absorption Measurement Method) The carbon dioxide-fixing surface coating material attached to a SUS plate and a CO2 concentration meter (manufactured by Shin Cosmos Electric Co., Ltd., product name "High-concentration Combustible Gas Detector XP-3140") were placed in a desiccator, and the desiccator was evacuated to -0.040 MPa (gauge pressure). At this time, the carbon dioxide-fixing surface coating material was installed so as not to touch the inner surface of the desiccator or the CO2 concentration meter. Also, when the carbon dioxide-fixing surface coating material has a substrate, it was installed so that the substrate surface of the carbon dioxide-fixing surface coating material does not touch the inner surface of the desiccator or the CO2 concentration meter. Then, a carbon dioxide gas cylinder was connected to the desiccator, and CO2 (component concentration 99.5 vol% or more) was injected into the desiccator until the internal pressure of the desiccator reached 0.000 MPa (gauge pressure). The CO2 concentration measured by the CO2 concentration meter in the desiccator 10 minutes after the start of injection was used as the initial concentration, the CO2 concentration in the desiccator 24 hours after the measurement of the initial concentration was measured by the CO2 concentration meter, and the carbon dioxide absorption amount 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 at 23°C.

Equation

[0058] (90-degree peel adhesion of the adhesive layer) A film was laminated to the adhesive used for the adhesive layer of the carbon dioxide-fixing surface coating material to prepare a measurement adhesive sheet having an adhesive layer on one surface of the film and the film. The film may be a film that is difficult to stretch so as not to break at the interface between the film and the glue during the measurement of the adhesive force. In this measurement, a primed PET film was used. The obtained measurement adhesive sheet was cut into a width of 15 mm and a length of 100 mm to prepare a measurement sample. In an environment of 23°C and 50% RH, the measurement sample was bonded to the following reference mortar plate through the adhesive layer and cured for 3 days in an environment of 23°C and 50% RH. In the bonding to the mortar, a 2 kg roller was reciprocated 2 times at a speed of 10 ± 0.5 mm / s. Then, the measurement sample cured for 3 days was fixed to the chuck of a tensile testing machine (manufactured by A&D Company, Ltd., trade name "Tensilon universal material testing machine"). Then, in an environment of 23°C and 50% RH, the adhesive sheet was pulled at a peeling angle of 90° and a speed of 300 mm / min for 60 mm or more, and the sectional average value of the load (N) detected by the load cell was recorded and taken as the 90-degree peel adhesion. (Reference Mortar Plate) The reference mortar plate was prepared as follows. ​A mortar plate (conforming to JIS R 5201, width 70 mm, length 150 mm) was prepared. The dust adhering to the surface of the prepared mortar plate was removed using a curing tape. At this time, an OPP tape (manufactured by Sekisui Chemical Co., Ltd., product name "Tufflite Tape No. 835") was attached to the surface of the mortar plate, and after peeling the OPP tape from the surface of the mortar plate, the OPP tape was attached to the release surface of a release PET (polyethylene terephthalate) film (thickness 50 μm) to obtain a sample, and dust removal was carried out until the total light transmittance thereof reached 87%. The mortar plate with dust removed as described above was used as a reference mortar plate, and the 90-degree peel adhesion of the adhesive layer to the reference mortar plate was measured.

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

[0060] (Total light transmittance of the carbon dioxide fixation surface coating material provided with a base material) A release PET (polyethylene terephthalate) film (manufactured by Lintec Corporation, product name "PET5002") was laminated on the adhesive layer of the carbon dioxide fixation surface coating material provided with a base material. Then, the total light transmittance of the carbon dioxide fixation surface coating material laminated with the release PET was measured at 23°C and in an atmosphere of 50% humidity using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "Haze Meter NDH4000") in accordance with JIS K 7361.

[0061] [Examples 1, 3, 5, 7, 9, 11, Comparative Example 1] An adhesive composition was prepared according to the formulations described in Table 1 and Table 2. Nitrogen was purged through this adhesive composition to remove dissolved oxygen. Next, the adhesive composition was applied onto a release-treated PET film, and further covered with a release-treated PET film thereon. In this state, the ultraviolet irradiation intensity was 0.5 mW / cm 2The lamp intensity of the chemical lamp was adjusted so as to be [intensity value], irradiated with ultraviolet rays for 5 minutes, and the pressure-sensitive adhesive composition was cured. According to the above procedure, a carbon dioxide-fixing surface coating material composed of a single pressure-sensitive adhesive layer was obtained. The results are shown in Tables 1 and 2. The carbon dioxide-fixing surface coating material was evaluated after peeling from the PET film.

[0062] [Examples 2, 4, 6, 8, 10, 12 to 15, Comparative Example 2] According to the formulations described in Tables 1 and 2, a pressure-sensitive adhesive composition was prepared. Nitrogen was purged through this pressure-sensitive adhesive composition to remove dissolved oxygen. Next, the pressure-sensitive adhesive composition was applied onto a release-treated PET film, and further covered with a release-treated PET film thereon. In this state, the lamp intensity of the chemical lamp was adjusted so that the ultraviolet irradiation intensity was 0.5 mW / cm 2 The lamp intensity of the chemical lamp was adjusted so as to be [intensity value], irradiated with ultraviolet rays for 5 minutes, and the pressure-sensitive adhesive composition was cured. Next, one of the release-treated PET films was peeled off, and the base materials described in Tables 1 and 2 were laminated on the adhesive surface side thereof. According to the above procedure, a carbon dioxide-fixing surface coating material composed of a base material and a pressure-sensitive adhesive layer was obtained. The carbon dioxide-fixing surface coating material was also evaluated after peeling from the other PET film. The results are shown in Tables 1 and 2.

[0063]

Table 1

[0064]

Table 2

[0065] Each component in Tables 1 and 2 is 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 "Alcon P140", manufactured by Arakawa Chemical Industries, Ltd., hydrogenated petroleum resin, softening point 140 °C Adhesive resin 2: Product name "Alcon P100", manufactured by Arakawa Chemical Industries, Ltd., hydrogenated petroleum resin, softening point 100 °C Crosslinking agent: Manufactured by Shin-Nakamura Chemical Co., Ltd., NK Ester A-HD-N, bifunctional alkyl acrylate Polymerization initiator: 2,2-dimethoxy-2-phenylacetophenone Acrylic film 1: Manufactured by Tatsuta Chemical Co., Ltd., product name "Soft Acrylic Sheet" Acrylic film 2: Manufactured by Mitsubishi Chemical Corporation, product name "Acriplen TM MTXA45" Carbon dioxide fixing agent: Calcium hydroxide, manufactured by Kanto Chemical Co., Inc., product number 07069-00

[0066] By comparing 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, it was found that the carbon dioxide fixing surface coating material can absorb and immobilize carbon dioxide in the atmosphere because the adhesive layer contains a carbon dioxide fixing agent. Also, it was found that the carbon dioxide fixing surface coating materials of Examples 2, 4, 6, 8, 10, 12 to 15 can absorb and immobilize carbon dioxide in the atmosphere even if they are provided with a substrate.

Explanation of symbols

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

Claims

1. A carbon dioxide fixing surface covering material that has an adhesive layer and is attached to the surface of a civil engineering structure 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 covering material was 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 at the time when 24 hours have elapsed since the start of the measurement was 3 kg / m ３ The carbon dioxide fixing surface coating material according to claim 1, <Method for measuring carbon dioxide absorption> In a 23°C environment, the carbon dioxide fixing surface coating material adheres to the inside of the desiccator and CO 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). [0010] 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 covering material according to claim 1 , wherein the adhesive layer contains one or more carbon dioxide fixing agents.

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

5. 4. 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. 4. The carbon dioxide fixing surface coating material according to claim 3, wherein the carbon dioxide fixing agent is calcium hydroxide.

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

8. 2. The carbon dioxide fixing surface covering 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. The surface coating method according to claim 11, further comprising a step of attaching a substrate to the surface of the civil engineering structure or the architectural structure opposite 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 fixation surface covering material according to any one of claims 1 to 10 has been applied.

14. An architectural structure to which the carbon dioxide fixing surface covering material according to any one of claims 1 to 10 is attached.

Images