JP2023028071A - Interior/exterior material and method for reinforcing interior/exterior base material - Google Patents

Abstract

To provide an interior/exterior material that enhances a strength of the interior/exterior material, and a method for reinforcing an interior/exterior base material.SOLUTION: An interior/exterior material includes: a coating layer 13 which is a cured product of a two-part reaction curing type epoxy resin containing a main agent which is a bisphenol A type epoxy resin to which a non-polar functional group is added, and a curing agent; and an interior/exterior base material 11 to which the coating layer 13 is adhered. The coating layer 13 is adhered to the interior/exterior base material 11 in a state in which reinforcing fibers 12 are impregnated with the two-part reaction curing type epoxy resin.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an interior/exterior material and a method for reinforcing an interior/exterior base material.

Cement base materials such as slate materials, which are excellent in heat resistance and fire resistance, are used as base materials for interior and exterior materials such as roof materials and exterior wall materials. A two-component reaction curing type epoxy resin that does not require heat curing is applied to paint finishing of interior and exterior base materials employed in large structures (see, for example, Patent Document 1). One method of finishing the interior and exterior substrates involves forming a primer layer made of a two-component waterborne epoxy resin and overcoating the primer layer with a mortar layer made of a water-curable cement mortar (e.g. , see Patent Document 2).

WO2010/137636 JP 2009-256133 A

By the way, when the strength of the interior/exterior material is insufficient or a defect is recognized, the strength of the interior/exterior material is supplemented by further coating the surface of the interior/exterior base material with a hard resin. On the other hand, when simply reinforcing an interior/exterior base material using a hard resin, there is a latent possibility that the hard resin coating layer itself may crack. After all, in the field of interior and exterior materials mentioned above, there is still a strong desire to further increase the strength of interior and exterior materials.

An interior and exterior material for solving the above problems includes an interior and exterior base material, and a reinforcing layer that is a composite of a coating layer adhered to the interior and exterior base material and reinforcing fibers, the coating layer comprising: A cured product of a two-component reaction curing type epoxy resin containing a main component that is a bisphenol A type epoxy resin to which a non-polar functional group is added and a curing agent, and the two component reaction curing type epoxy resin is applied to the reinforcing fiber. It is in close contact with the interior/exterior base material in an impregnated state, and the reinforcing fiber is any one of a raised fabric net, a nonwoven fabric net, a net with loops, and a hexagonal mesh net.

According to the interior/exterior material, the intermolecular bonds between the main agents are weakened compared to the case where the bisphenol A type epoxy resin to which the non-polar functional group is not added is used as the main agent. As a result, micronization of the cured product on the surface to which the two-part reaction-curable epoxy resin is applied is promoted, and the followability, adhesion, and coatability of the cured product on the surface are enhanced. As a result, the bending strength, compressive strength, and tensile strength of the interior and exterior materials can be increased by the two-part reaction-curable epoxy resin. The above-mentioned two-liquid reaction-curing epoxy resin can be applied to boarding and tile substrates, and can be applied to repair cracks in precast concrete members. It is possible. Then, the hardened material impregnated with any one of the reinforced fabric net, the non-woven fabric net, the net with loops, and the hexagonal mesh net, and the reinforcing layer composed of the reinforced fiber, are used for the interior and exterior. A substrate is coated. As a result, the adhesiveness between the interior and exterior base material and the reinforcing layer can be enhanced by the cured product, and the strength of the two-liquid reaction curing type epoxy resin can be enhanced by the reinforcing fiber. It is also possible to further increase the strength and tensile strength. In addition, the reinforcing layer and the finishing layer can more easily follow the movement of the base material and the cracks (cracks) generated in the base material.

In the interior/exterior material, the curing agent may be at least one selected from the group consisting of an amine-based curing agent, an imidazole-based curing agent, a polymercaptan-based curing agent, and an acid anhydride-based curing agent.
According to the interior and exterior materials, it is possible to suppress instability during storage due to the high reactivity of the polythiol-based epoxy curing agent, as compared with a configuration including a polythiol-based epoxy curing agent. Then, it is possible to increase the effectiveness of increasing the bending strength, compressive strength, and tensile strength of the interior and exterior materials.

In the interior/exterior material, the non-polar functional group may be added to the bisphenol A epoxy resin by complex modification of the bisphenol A epoxy resin.
According to the above-mentioned interior and exterior materials, it is also possible to increase the effectiveness of maintaining the durability and weather resistance, which are the characteristics of a cured product having a bisphenol A type epoxy resin as a main skeleton.

In the interior/exterior material, the coating layer may adhere to the interior/exterior base material as a single-layer structure that does not include a primer layer. One example of the primer layer is a primer layer in paint finishing of interior and exterior base materials.
According to the interior/exterior material, it is also possible to reduce the load required to reinforce the interior/exterior base material.

A method for reinforcing an interior/exterior base material for solving the above-mentioned problems is to impregnate reinforcing fibers with a two-part reaction-curable epoxy resin on the interior/exterior base material without forming a primer layer on the interior/exterior base material. wherein the two-component reaction curing type epoxy resin comprises a main component that is a bisphenol A type epoxy resin to which a non-polar functional group is added, and a curing agent, and the reinforcing fibers are raised fabric nets and nonwoven fabric nets. , a net with loops, and a hexagonal mesh net.

According to the method for reinforcing the interior/exterior base material, the load required for reinforcing the interior/exterior base material can be reduced by the amount that the step of forming the primer layer is not required. By coating the surface of the interior/exterior base material with the cured product of the two-part reaction-curable epoxy resin, it is possible to increase the bending strength, compressive strength, and tensile strength of the interior/exterior material. That is, the curable resin composition also functions as a primer layer.

Sectional drawing of the interior/exterior material in one Embodiment of an interior/exterior material. Sectional drawing which shows one process in one Embodiment of the reinforcement method of an interior/exterior base material. Sectional drawing which shows one process in one Embodiment of the reinforcement method of an interior/exterior base material. FIG. 2 is a schematic diagram showing a structural model of a two-part reaction-curable epoxy resin before curing. FIG. 3 is a schematic diagram showing a structural model after curing of the two-component reaction curing type epoxy resin. Schematic diagram showing a coating model after curing of a two-component reaction curing type epoxy resin. The graph which shows the relationship between the stroke and load in the bending fracture load test of an interior/exterior material.

An embodiment of an interior/exterior material and a reinforcing method for an interior/exterior base material will be described with reference to FIGS. 1 to 7 . First, the structure of the interior and exterior materials will be described, then the method of reinforcing the interior and exterior base materials will be described, and then the structure of the two-liquid reaction curing type epoxy resin used in the reinforcement method will be described.

[Interior and exterior materials]
The interior and exterior materials will be described with reference to FIG. The interior/exterior material includes an interior/exterior base material 11 , reinforcing fibers 12 , and a coating layer 13 . The coating layer 13 is a single layer structure having a non-primer structure without a primer layer. The reinforcing fibers 12 are covered with the coating layer 13 . The built-in member may have a topcoat layer covering the coating layer 13 for the purpose of enhancing weather resistance. The overcoat layer is formed by overcoating the coating layer 13 with, for example, an acrylic resin, a urethane resin, an acrylic silicone resin, a silicone resin, or a fluorine resin.

A composite of the reinforcing fiber 12 and the coating layer 13 is a reinforcing layer that reinforces the interior/exterior base material 11 . The reinforcing layer is applied to the interior/exterior base material 11 . The coating layer 13 is adhered to the interior/exterior base material 11 in a state in which the reinforcing fibers 12 are impregnated with the two-liquid reaction-curable epoxy resin.

An example of the interior/exterior base material 11 is a cement base material. The interior/exterior base material 11 may be a metal base material, a wood base material, or a stone material. Cement base materials include corrugated slates such as asbestos slate, flat decorative slates such as color vests, slate materials such as colonial boards, calcium silicate boards, and gypsum boards. The interior/exterior base material 11 may be a concrete member such as a precast concrete curtain wall. Concrete includes reinforced concrete containing fibers and resins. Metal substrates include stainless steel substrates, aluminum substrates, and iron-aluminum-zinc alloy substrates. Wood-based base materials include solid wood, laminated wood, laminated wood, plywood, and wooden board.

The reinforcing fibers 12 cover the surface of the interior/exterior base material 11 . The reinforcing fiber 12 may be a layered member made of woven fibers or a layered member made of woven fibers. The reinforcing fiber 12 may be a layered member in which loop-like fibers such as knit loops are woven into a sheet or mat. The two-part reaction-curing epoxy resin impregnated into the reinforcing fibers 12 enhances the bending strength, compressive strength, and tensile strength of the reinforcing layer.

The reinforcing fibers 12 are any one of a raised fabric net, a non-woven net, a looped net, and a hexagonal mesh net. Note that FIG. 1 shows an example in which the reinforcing fibers 12 are nets with loops.
The raised fabric net includes a raised portion in a net-like fabric net. The raised portion is formed by cut pile, and the tips of the fibers are cut. The nonwoven fabric net is provided with yarns woven into the nonwoven fabric, which is a base fabric. The threads are woven into the nonwoven fabric using a needle punching method or a stitch bonding method, thereby raising the nonwoven fabric. A looped net comprises looped fibers in a mesh-like base sheet. Loop-shaped fibers are planted on one side or both sides of the base sheet. A hexagonal mesh net is a tortoiseshell net in which the mesh or weave openings have hexagonal shapes.
The mesh formed by the net in the reinforcing fibers 12 exposes the surface of the interior/exterior base material 11 to the coating layer 13 in the thickness direction of the reinforcing fibers 12 . The mesh formed by the net in the reinforcing fiber 12 has a size of, for example, 9 mm ² or more so that the two-liquid reaction-curable epoxy resin forming the coating layer 13 can easily pass through. The two-liquid reaction curing type epoxy resin that forms the coating layer 13 is bonded to the surface of the interior/exterior base material 11 through meshes formed by nets in the reinforcing fibers 12 .
The fibers forming the reinforcing fibers 12 may be organic fibers or inorganic fibers. Fibers constituting the reinforcing fibers 12 include, for example, synthetic fibers, acetate-based semi-synthetic fibers, regenerated fibers such as rayon, aramid fibers, high-strength polyethylene fibers, polybenzazole fibers, carbon fibers, reinforcing fibers such as boron fibers, and cotton. , is at least one selected from the group consisting of hemp. A material constituting the synthetic fiber is at least one selected from the group consisting of polyester, polyamide, polypropylene, polyvinyl alcohol, nylon, and acrylic, for example. The fibers constituting the reinforcing fibers 12 may be monofilaments or multifilaments.
The base sheet forming the reinforcing fibers 12 may be a knitted fabric such as weft knitting or warp knitting, or may be a woven fabric such as plain weave, twill weave, or satin weave. The two-liquid reaction curing type epoxy resin forming the coating layer 13 passes through the base sheet and nonwoven fabric of the reinforcing fibers 12 . The napped portions and loop-shaped fibers in the reinforcing fibers 12 enhance the anchoring effect to the coating layer 13, and further the anchoring effect to the overcoat layer when the portion exposed from the coating layer 13 is provided. The threads woven into the nonwoven fabric suppress unevenness in the coating layer 13 depending on the basis weight of the nonwoven fabric, and improve the surface accuracy of the coating layer 13 .

The coating layer 13 covers the surface of the interior/exterior base material 11 . The coating layer 13 is a cured product of a two-component reaction curing type epoxy resin. A two-part reaction curing type epoxy resin is prepared by mixing a main agent and a curing agent immediately before application.

The coating layer 13 joins the interior/exterior base material 11 and the reinforcing fibers 12 . The coating layer 13 may cover the entirety of the fibers forming the reinforcing fibers 12 , or may expose a portion of the fibers forming the reinforcing fibers 12 from within the coating layer 13 . If the interior/exterior base material 11 is an asbestos slate or the like that scatters fibers or powder, the coating layer 13 prevents them from scattering from the surface of the interior/exterior base material 11 .

The two-liquid reaction-curing epoxy resin used for forming the coating layer 13 has such a viscosity that the reinforcing fibers 12 are impregnated with it. When the reinforcing fibers 12 are loop-shaped fibers, a two-liquid reaction-curing epoxy resin having a viscosity sufficient to flow into the loops is used to form the coating layer 13 .

[Method for reinforcing interior and exterior base materials]
A method of reinforcing the interior and exterior base materials will be described with reference to FIGS. 2 and 3. FIG.
The method for reinforcing the interior/exterior base material includes a step of applying a two-part reaction-curable epoxy resin to the surface of the interior/exterior base material 11 . The method for reinforcing the interior/exterior base material may include a pretreatment step such as cleaning, roughening, and washing the surface of the interior/exterior base material 11 prior to the application of the two-part reaction-curable epoxy resin. Further, the method for reinforcing the interior and exterior base material includes the steps of attaching the reinforcing fiber 12 to the surface of the interior and exterior base material 11, and further applying the two-component reaction curing type epoxy resin to the surface of the reinforcing fiber 12. good too.

Methods of pre-treating the surface of the interior/exterior base material 11 include wiping with a waste cloth, washing with water or high-pressure water, cleaning or roughening with an electric tool such as an electric brush or disk sander, or blasting. The cleaning of the surface removes dirt adhering to the surface and also removes the deteriorated portion of the substrate and the previous coating layer that has deteriorated on the surface.

As shown in FIG. 2, in the step of applying the two-component reaction-curable epoxy resin, the two-component reaction-curable epoxy resin is applied to the surface of the interior/exterior base material 11, thereby forming the first coating layer 13A. That is. Further, as shown in FIG. 3, the reinforcing fibers 12 are attached to the first coating layer 13A before curing. The step of applying the two-component reaction-curable epoxy resin includes impregnating the reinforcing fibers 12 with the two-component reaction-curable epoxy resin, thereby forming the second coating layer 13B. The two-component reaction curing type epoxy resin for forming the first coating layer 13A and the two-component curing type epoxy resin for forming the second coating layer 13B are made of the same main agent and the same curing agent. containing agents.

The two-part reaction curing type epoxy resin is applied in such a manner that the coating amount per application is 100 g/m ² or more and 10 kg/m 2 or less, preferably 300 g/m ^{2 or} more and 3 kg/m ² or less. Apply a two-component reaction curing type epoxy resin so that the The application amount of the two-part reaction curing type epoxy resin may be changed based on the strength required for the interior/exterior material, or may be changed based on the degree of deterioration of the interior/exterior base material 11 . The application amount of the two-component reaction-curable epoxy resin may be changed based on the type and thickness of the reinforcing fiber 12, or may be changed based on the type of the two-component reaction-curable epoxy resin.

The step of attaching the reinforcing fibers 12 arranges the reinforcing fibers 12 on the first coating layer 13A. Whether the interior/exterior base material 11 is not missing or the interior/exterior base material 11 is partly missing, attaching the reinforcing fiber 12 is a two-step additional coating by attaching the reinforcing fiber 12. - 特許庁By doing so, the strength of the interior and exterior materials is increased, and the interior and exterior materials can be repaired. In the step of applying the two-part reaction curing type epoxy resin, the surface of the interior/exterior base material 11 is reinforced by expressing high adhesion between the coating layer 13 and the reinforcing fibers 12 without using a primer layer. A fiber 12 is deposited. In addition, the step of applying the two-component reaction curing type epoxy resin enhances the adhesion between the surface of the interior/exterior base material 11 and the reinforcing layer, regardless of whether the reinforcing fiber 12 is used or not. make it possible.

Note that if the reinforcing fibers 12 are configured such that the raised portions or loop-shaped fibers are planted on both sides of the base material sheet, the bonding strength between the interior/exterior base material 11 and the reinforcing fibers 12 can be further increased. Moreover, even if rust occurs on the interior and exterior base material 11 made of metal, it is possible to bond the reinforcing layer to the surface of the interior and exterior base material 11 by removing the fragile rust. Further, the high adhesion between the interior/exterior base material 11 and the reinforcing layer makes it possible to suppress the occurrence of new rust and further progression of rust.

[Two-liquid reaction curing type epoxy resin]
A two-part reaction-curable epoxy resin in one embodiment will be described with reference to FIGS. 4 to 6. FIG. The two-component reaction curing type epoxy resin includes the following [A] to [C]. The two-component reaction curing type epoxy resin may contain [D] additive in addition to the following [A] to [C].
[A] Main agent [B] Curing agent [C] Medium

[A] The main component is a bisphenol A type epoxy resin to which a non-polar functional group is added.
The compounding ratio of [B] curing agent to [A] main agent is 0.8 equivalent or more and 1.2 equivalent or less per 1 mol of epoxy groups in [A] main agent. When the compounding ratio of [B] curing agent to [A] main agent is 0.8 equivalent or more, the crosslink density in the coating layer 13 is increased, and bending strength, compressive strength, tensile strength, etc. in the coating layer 13 are improved. It is possible to increase the strength. And it becomes possible to suppress cracks in the interior and exterior materials. If the compounding ratio of the [B] curing agent to the [A] main agent is 1.2 equivalents or less, the increase in the unreacted amount of the [B] curing agent is suppressed, and the bending strength, compressive strength, and It is possible to suppress a decrease in strength such as tensile strength.

The compounding ratio of [A] main agent to 100 parts by mass of the two-pack reaction curing type epoxy resin may be 60 parts by mass or more and 95 parts by mass or less. The compounding ratio of [A] main agent to 100 parts by mass of the two-pack reaction curing type epoxy resin is preferably 70 parts by mass or more and 90 parts by mass or less. [A] When the content of the main agent is 60 parts by mass or more, it is possible to increase the bending strength, compressive strength, and tensile strength of the cured product of the two-component reaction curing type epoxy resin. [A] When the content of the main agent is 95 parts by mass or less, it is possible to improve the heat resistance of the cured product of the two-component reaction curing type epoxy resin.

As shown in FIG. 4 , the molecular structure of [A] main agent before curing comprises a bisphenol A type epoxy resin forming main chain 21 and non-polar functional groups 22 added to main chain 21 . Main chain 21 is a bisphenol A type epoxy resin having two or more glycidyl groups in one molecule. The non-polar functional group 22 is added to the [A] main agent through complex modification for depolarizing the main chain 21 . An example of complex modification to depolarize backbone 21 is dehydration condensation with alcoholic hydroxyl groups of backbone 21 .

The epoxy equivalent is the mass (g/eq) per mole of epoxy group. [A] The epoxy equivalent of the main agent can be changed as appropriate. The epoxy equivalent may be 200 g/eq or more and 4000 g/eq or less, or 1000 g/eq or more and 3000 g/eq or less. If the epoxy equivalent is 200 g/eq or more, high workability, corrosion resistance, and curability can be obtained. On the other hand, an epoxy equivalent weight of 4000 g/eq or less provides medium dilutability, penetrability, and processability in the medium with adequate viscosity.

[A] The main chain 21 constituting the main agent may be a liquid epoxy resin or a solid epoxy resin. The number of repeating bisphenol A skeletons in main chain 21 may be 1 or more and 10 or less. The number of repeating bisphenol A skeletons is appropriately set based on the viscosity required for the two-component reaction curing type epoxy resin. If the number of repeated bisphenol A skeletons is 1 or more and 3 or less, [A] the main agent is liquid at room temperature, and if the number of repeated bisphenol A skeletons is 3 or more and 10 or less, [A] the main agent is Solid.

Bisphenol A type epoxy resins include, for example, Epiclon (registered trademark) 850 (manufactured by DIC Corporation), Epototh (registered trademark) YD-128 (manufactured by Nippon Steel & Sumikin Chemical Co., Ltd.), DER-331, DER-332 (above , manufactured by Dow Chemical Japan Co., Ltd.), EPON825, jER826, jER827, and jER828 (manufactured by Mitsubishi Chemical Corporation).

[A] An example of the main agent is represented by the following formula (1). [A] An example of the main agent contains a bisphenol A skeleton in a repeating unit.
In formula (1), each R ⁰ is independently a hydrogen atom or an alkyl group having 1 to 10 carbon atoms. In formula (1), m is an integer of 1 or more. In formula (1), n is an integer of 1 or more. In formula (1), R ¹ is a non-polar functional group 22 having a sufficiently small dipole moment among functional groups. R ¹ is any one selected from the group consisting of a chain alkyl group having 3 to 10 carbon atoms such as a butyl group and an octyl group, a cyclic alkyl group such as a cyclohexyl group, a phenyl group, and a diphenyl group. .

図５が示すように、二液反応硬化型エポキシ樹脂の硬化物における〔Ａ〕主剤の分子構造は、主鎖２１と側鎖とを相互作用を通じて絡めるような球形状を有する。なお、〔Ａ〕主剤において非極性官能基２２が付加されていない従来の二液反応硬化型エポキシ樹脂では、さらに１つの〔Ａ〕主剤と他の〔Ａ〕主剤とが分子間の相互作用を通じて絡まる。結果として、硬化物における〔Ａ〕主剤の粒子直径は、５０μｍ以上１００μｍ以下にまで達している。

As shown in FIG. 5, the molecular structure of the main agent [A] in the cured product of the two-pack reaction curing type epoxy resin has a spherical shape that entangles the main chain 21 and the side chains through interaction. In addition, in the conventional two-part reaction curing type epoxy resin in which the nonpolar functional group 22 is not added to the [A] main agent, one [A] main agent and another [A] main agent Get entangled. As a result, the particle diameter of the [A] main agent in the cured product reaches 50 μm or more and 100 μm or less.

On the other hand, when the non-polar functional groups 22 are added to the [A] main agent, the adjacent [A] main agents repel the approach of the non-polar functional groups 22 . As a result, entanglement due to interaction between one [A] main agent and another [A] main agent is unlikely to occur, and the [A] main agent becomes fine particles in the cured product. Then, the particle diameter of the main agent [A] in the cured product is reduced to about 1/10,000th of that in the configuration to which the non-polar functional group 22 is not added, such as 5 nm or more and 80 nm or less.

As shown in FIG. 6, the surface of the interior/exterior base material 11 is an uneven surface including minute unevenness. Micro unevenness on the surface of the interior/exterior base material 11 forms a gap between the surface of the interior/exterior base material 11 and the reinforcing layer, and reduces the adhesion between the surface of the interior/exterior base material 11 and the reinforcing layer. can be a contributing factor. In this regard, the cured product 13M containing the [A] main agent finely divided by the addition of the non-polar functional group 22 follows the surface of the interior and exterior base material 11, and the adhesion between the surface and the reinforcing layer and the reinforcing layer Increases coverage with In addition, the hardened material 13M finely divided by the addition of the non-polar functional groups 22 also enhances the bending strength, compressive strength and tensile strength of the reinforcing layer. That is, the two-component reaction curing type epoxy resin to which the non-polar functional group 22 is added has high strength and also has high deformation followability.

[B] The curing agent is at least one selected from the group consisting of amine-based curing agents, imidazole-based curing agents, polymercaptan-based curing agents, and acid anhydride-based curing agents. The curing agent may be a thiol-based curing agent.

Amine-based curing agents include polyamidoamine-based curing agents and polyamide resin-containing varnishes. Amine-based curing agents are selected from the group consisting of aliphatic amine-based curing agents, aromatic amine-based curing agents, modified amine-based curing agents, polyamidoamines, secondary amine-based curing agents, and tertiary amine-based curing agents. At least one. Fat side amine curing agents are, for example, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, dipropylenediamine, diethylaminopropylamine and polypropylenetriamine. Aromatic amine curing agents include, for example, aromatic diaminodiphenylmethane compounds, 2,4-diaminotoluene, 1,4-diaminobenzene, 1,3-diaminobenzene and the like.

Examples of imidazole-based curing agents include 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-phenylimidazole, 1-benzyl-2-methylimidazole, and the like. . Polymercaptan-based curing agents are, for example, liquid polymercaptan and polysulfide resins.

The acid anhydride curing agent is at least one selected from the group consisting of phthalic anhydride compounds and carboxylic acid anhydrides. Phthalic anhydride compounds include, for example, 3,4-dimethyl-6-(2-methyl-1-propenyl)-1,2,3,6-tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride acid, hexahydrophthalic anhydride, and the like. Carboxylic anhydrides include 1-isopropyl-4-methyl-bicyclo[2.2.2]oct-5-ene-2,3-dicarboxylic anhydride, benzophenonetetracarboxylic dianhydride, diphenyl-3,3 ',4,4'-Tetracarboxylic dianhydride.

[C] The medium facilitates mixing of the two-part reaction curing type epoxy resin and the curing agent. [C] The medium may be a solvent consisting of a single liquid, or a mixed solvent that is a mixture of two or more liquids. [C] The medium may be an organic solvent, an organic solvent, or an organic dispersion medium. The medium may be at least one selected from the group consisting of aliphatic or aromatic hydrocarbons, alcohols, ethers, esters and alcohol ethers.

[Additive]
Additives include, for example, curing accelerators, reactive diluents, polymerization initiators, viscosity modifiers, plasticizers, leveling agents, antifoaming agents, anti-settling agents, stabilizers, rust inhibitors, fluorescent agents, and UV absorbers. , is an antioxidant. Additives are, for example, fiber diameter resins, inorganic fillers, and inorganic colorants.

The curing accelerator accelerates the curing reaction in the two-component reaction curing type epoxy resin. Curing accelerators are, for example, phosphorus compounds such as triphenylphosphine and tributylphosphine, tertiary amine compounds such as triethylamine and benzyldimethylamine, and imidazoles such as 2-methylimidazole and 2-ethyl-4-methylimidazole.

The reactive diluent lowers the viscosity of the two-component reaction-curable epoxy resin without impairing the properties of the two-component reaction-curable epoxy resin. The reactive diluent may be a monoepoxy compound. Monoepoxy compounds are, for example, alkyl monoglycidyl ethers, alkyl diglycidyl ethers, alkylphenol monoglycidyl ethers.

Examples of inorganic fillers include silicas such as fused silica and crystalline silica, aluminum oxide, aluminum phosphate, silicon nitride, silicon oxide, magnesium oxide, and calcium carbonate. Colorants are, for example, titanium oxide, yellow iron oxide, and carbon black.

[Example]
A layered member in which loop-shaped inorganic fibers are woven on one side of a net-like base sheet is arranged on the surface of a slate for a corrugated roof as an example of reinforcing fibers of a net with loops, and the coating amount is 750 g / m ² . , a two-liquid reaction curing type epoxy resin was applied so as to be impregnated into the layered member to form the interior and exterior material of the example. At this time, the octyl group was used as the non-polar functional group of the main agent constituting the two-component reaction curing type epoxy resin. In addition, an amine-based curing agent was used as a curing agent constituting the two-liquid reaction curing type epoxy resin.

Then, the interior and exterior materials of Examples were subjected to a bending breaking load test using a method conforming to JIS A 5423:2013, and the maximum load of Examples was measured. Also, the bending strength (N/mm ² ) of the interior and exterior materials was measured using a method based on JIS A 1106. In addition, the compressive strength (N/mm ² ) of the resin piece was measured using a method conforming to JIS K 7181 for the resin piece of the cured product prepared using the two-component reaction-curable epoxy resin of the example. Furthermore, the tensile strength (N/mm ² ) of the resin piece was measured using a method conforming to JIS K 7161 for the resin piece of the cured product prepared using the two-component reaction-curable epoxy resin of the example.

A high-strength structural reinforcing epoxy resin was applied to the surface of a corrugated roof slate in an amount of 750 g/m ² to form an interior and exterior material of a comparative example. At this time, as the main component constituting the epoxy resin for high-strength structure reinforcement, a bisphenol A type epoxy resin, which is the same as the two-component reaction curing type epoxy resin, and is not modified with non-polar functional groups, was used.

Then, the interior and exterior materials of the comparative examples were subjected to a bending breaking load test using a method conforming to JIS A 5423:2013, and the maximum load of the comparative examples was measured. In addition, the bending strength (N/mm ² ) of the interior and exterior material of the comparative example was measured using a method based on JIS A 1106. In addition, the compressive strength (N/mm ² ) of the resin piece was measured using a method conforming to JIS K 7181 for a resin piece of a cured product prepared using the two-liquid reaction-curable epoxy resin of the comparative example. Further, the tensile strength (N/mm ² ) of the resin piece was measured using a method conforming to JIS K 7161 for a resin piece of a cured product prepared using the two-component reaction-curable epoxy resin of the comparative example.

FIG. 7 shows the relationship between the stroke and the load in the bending breaking load test results using the interior and exterior materials of Examples and the bending breaking load test results using the interior and exterior materials of Comparative Examples. As shown in FIG. 7, the maximum load of the comparative example is 2804N, while the maximum load of the example is 7557N, which is a very high value.

The bending strength of the example was 66.6 (N/mm ² ), and the bending strength of the comparative example was 40 (N/mm ² ). rice field.
The compressive strength of the example is 90.4 (N/mm ² ), and the bending strength of the comparative example is 70 (N/mm ² ). Admitted.

The tensile strength of the example is 72.8 (N/mm ² ), and the tensile strength of the comparative example is 30 (N/mm ² ). was accepted.

As described above, according to the above embodiment, the following effects can be obtained.
(1) [A] Since the bisphenol A type epoxy resin to which the non-polar functional group 22 is added is provided as the main agent, the cured product on the surface of the interior and exterior base material 11 is promoted to be finely divided, and the curing on the surface is promoted. Followability, adhesion and coverage of objects are enhanced. As a result, the bending strength, compressive strength, and tensile strength of the interior and exterior materials can be enhanced by the two-part reaction-curable epoxy resin.

(2) [B] Since the curing agent does not contain a polythiol-based epoxy curing agent, it is possible to suppress destabilization during storage due to the high reactivity of the curing agent. Then, it is possible to increase the effectiveness of increasing the bending strength, compressive strength, and tensile strength of the interior and exterior materials.

(3) Since the non-polar functional group 22 is added by complex modification of the bisphenol A type epoxy resin, it is effective to maintain the durability and weather resistance which are the characteristics of the cured product with the bisphenol A type epoxy resin as the main skeleton. can also be increased.

(4) When the reinforcing layer includes reinforcing fibers 12, the reinforcing fibers 12 can increase the strength of the two-part reaction-curable epoxy resin, so that the bending strength, compressive strength, and tensile strength of the interior and exterior materials can be further increased. It is possible to raise it. In addition, the reinforcing layer and the finishing layer overlaid on the reinforcing layer can more easily follow movement of the base material and cracks (cracks) generated in the base material.

(5) Since the coating layer 13 is a single-layer structure that does not include a primer layer, it is also possible to reduce the load required for reinforcing the interior and exterior base materials. It also contributes to shortening the construction period and reducing costs.
(6) When the two-part reaction hardening type epoxy resin is adhered to the interior/exterior base material 11 in a state in which the reinforcing fibers 12 are impregnated with the two-part reaction hardening type epoxy resin, the work of applying the two-part reaction hardening type epoxy resin is required. In addition, it becomes possible to include the work of increasing the strength of the two-liquid reaction curing type epoxy resin with the reinforcing fiber 12 . This also makes it possible to simplify the work required for reinforcement.

(7) Even if the deteriorated coating layer 13 and rust are not completely removed in repairing the interior and exterior materials, the high adhesion provided by the two-component reaction curing type epoxy resin suppresses the peeling of the new coating layer 13. make it possible. In addition, even if rust remains in the internal corners, it is possible to suppress the progress of corrosion of the interior and exterior base materials 11, so that it is possible to greatly improve the workability in repair.

It should be noted that the above embodiment can be implemented with the following changes.
- If the two-pack reaction curing type epoxy resin is not required to have stability during storage, it is possible to include a polythiol-based epoxy curing agent in [B] curing agent.

[A] The first coating layer 13A formed of a two-component reaction-curable epoxy resin containing a main agent may be applied as a primer layer for a coating layer formed of a material other than the two-component reaction-curable epoxy resin.

- The interior/exterior material may have a structure in which the interior/exterior base material 11 and the reinforcing fiber 12 are integrated. At this time, the method of reinforcing the interior and exterior base material omits the step of attaching the reinforcing fiber 12 to the surface of the interior and exterior base material 11, and the reinforcing fiber 12 integrated with the interior and exterior base material 11 is a two-liquid reaction curing type. Apply epoxy resin. The coating layer 13 is not interposed between the interior/exterior base material 11 and the reinforcing fiber 12, but is the entire fiber constituting the interior/exterior base material 11 and the reinforcing fiber 12 integrated therewith, or the fiber constituting the reinforcing fiber 12. part of the

DESCRIPTION OF SYMBOLS 11... Interior/exterior base material, 12... Reinforcement fiber, 13... Coating layer, 13M... Hardened material, 21... Main chain, 22... Non-polar functional group.

Claims (5)

interior and exterior base materials;
A reinforcing layer that is a composite of a coating layer and reinforcing fibers that are in close contact with the interior and exterior base materials,
The coating layer is
a main agent that is a bisphenol A type epoxy resin to which a non-polar functional group is added;
A cured product of a two-part reaction curing type epoxy resin containing a curing agent,
The two-part reaction-curable epoxy resin impregnated in the reinforcing fibers is in close contact with the interior and exterior base materials,
The reinforcing fiber is any one of a raised fabric net, a non-woven fabric net, a net with loops, and a hexagonal mesh net. The interior/exterior material according to claim 1, wherein the curing agent is at least one selected from the group consisting of an amine curing agent, an imidazole curing agent, a polymercaptan curing agent, and an acid anhydride curing agent. The interior/exterior material according to claim 1 or 2, wherein the nonpolar functional group is added to the bisphenol A type epoxy resin through complex modification of the bisphenol A type epoxy resin. The interior/exterior material according to any one of claims 1 to 3, wherein the coating layer is in close contact with the interior/exterior base material as a single-layer structure that does not include a primer layer. impregnating reinforcing fibers with a two-part reaction-curable epoxy resin on the interior and exterior base material without forming a primer layer on the interior and exterior base material;
The two-component reaction curing type epoxy resin is
a main agent that is a bisphenol A type epoxy resin to which a non-polar functional group is added;
a curing agent;
The reinforcing fiber is any one of a raised fabric net, a non-woven fabric net, a net with loops, and a hexagonal mesh net. A method of reinforcing interior and exterior base materials.

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