JP2023018506A - Hydraulic epoxy resin mortar composition for floor finishing and application method of the same - Google Patents

Abstract

To provide a hydraulic epoxy resin mortar composition for floor finishing and a production method of the same, enabling excellent finishing, where one can walk on the coated composition on the following day of the application even applied under an atmosphere at 5°C, and even in a case where there is unevenness on ground concrete or there is a protruded part locally.SOLUTION: The invention relates to a hydraulic epoxy resin mortar composition for floor finishing and an application method of the same, the hydraulic epoxy resin composition for floor finishing including hydraulic cement, aggregate, epoxy resin, an aqueous epoxy resin curing agent, and a non-aqueous epoxy resin curing agent, where a weight ratio of the hydraulic cement and the water is 0.1-0.4, a resin solid weight accounts for 40-60% of the total weight of the composition including the water, if the resin is considered what the aqueous epoxy resin curing agent and the non-aqueous epoxy resin curing agent that react with the epoxy resin are added to the epoxy resin, and the aggregate accounts for 20-50 pts.wt to 100 pts.wt of the total composition.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a hydraulic epoxy resin mortar composition for floor finishing, which is applied to a base concrete surface to form a floor coating, and a method for applying the same.

Conventionally, a coating material composition to be applied to a base concrete surface, a floor construction method using the same, and a floor structure using the same have been proposed (Patent Document 1). The coating material composition is a water-based epoxy resin mortar composition containing hydraulic cement, aggregate, and water-based epoxy resin, wherein the weight ratio of hydraulic cement to water is 0.3 or more and 0.4 or less, and the epoxy resin When the resin is made by adding a curing agent that reacts with the epoxy resin, the resin solid content weight of the resin is 4% or more and 10% or less based on the weight of the entire compound containing water, and the total weight of the cured product The pore volume is 0.05 cc/g or more and 0.2 cc or less; The coating material composition is characterized by having an I value of 1.0 to 1.5.

After the coating material composition is applied to the base concrete and cured, a finishing coating material of solvent-free, solvent-based, or water-based epoxy resin or solvent-free, solvent-based, or water-based urethane resin is applied thereon. Since it is multi-layered, there is a problem that it cannot be finished by simply applying the coating material composition.

In addition, a coating material composition in which the swollen area ratio of the finishing coating material is 0.5% or less, is excellent in adhesion to the finishing coating material, and prevents water from permeating from the underlying concrete. A water-based epoxy resin mortar composition containing hydraulic cement, aggregate, and water-based epoxy resin, wherein the weight ratio of hydraulic cement to water is 0.33 or more and 0.37 or less, and the epoxy resin reacts with the epoxy resin. When the resin is made by adding a curing agent, the resin solid content weight of the resin is 8% or more and 9% or less with respect to the weight of the entire compound containing water, and the total pore volume of the cured product is 0.10 cc/g or more and 0.15 cc/g or less, T.I. The I value is 1.1 or more and 1.3 or less, the water-based epoxy resin is composed of a non-emulsifying epoxy resin and a self-emulsifying curing agent, and the viscosity of the coating material composition immediately after mixing is 2 Pa s or more. A coating material composition has been proposed, which has a temperature of 3 Pa·s or less/23° C., white cement as a hydraulic cement, and is applied to a base concrete to a thickness of 0.8 to 1.2 mm and cured. (Patent Document 2).

The coating material composition, like the coating material composition of Patent Document 1, is applied to the base concrete and cured, and then solvent-free, solvent-based, or water-based epoxy resin or solvent-free, There is a problem that it is not possible to simply apply the coating material composition and finish it as it is, since the finishing coating material of solvent-based or water-based urethane resin is overlaid.

In order to solve these problems, a hydraulic epoxy resin mortar composition for floor finishing comprising hydraulic cement, aggregate, epoxy resin and a water-based epoxy resin curing agent, wherein the weight ratio of hydraulic cement to water is 0.3 to 0.4, and the weight of the resin solid content when the resin is made by adding a water-based epoxy resin curing agent that reacts with the epoxy resin to the weight of the entire composition containing water is 8 to 9%, the aggregate has a specific surface area per unit weight of the composition of 29 to 34 cm ² /g, and the aggregate contains No. 6 silica sand and No. 7 silica sand. A hydraulic epoxy resin mortar composition has been proposed (Patent Document 3).

Japanese Patent No. 4794007 Japanese Patent No. 6101524 JP 2019-210192 A

However, the hydraulic epoxy resin mortar composition for floor finishing described in Patent Document 3 is cured by the reaction of the water-based epoxy resin curing agent with the epoxy resin and the hydration of the hydraulic cement. If applied in a low temperature environment of about 5 ° C, there is a problem that the applied composition may not be able to walk on the coating film due to insufficient curing on the next day after application. Because it contains No. 6 silica sand, if the base concrete has unevenness or if there are local protrusions, the No. 6 silica sand will appear uneven on the surface of the coating film, resulting in a poor finish. There is a problem that there is a case.

The problem to be solved by the present invention is that it cures quickly at a low temperature of about 5 ° C., and even if it is applied in an environment of 5 ° C., it is possible to walk on the applied composition the day after the application and the base. To provide a hydraulic epoxy resin mortar composition for floor finishing which gives a good finish even when concrete has unevenness or locally has convex portions, and to provide a method for applying the composition.

In order to solve the above-mentioned problems, the invention according to claim 1 is a hydraulic epoxy resin mortar composition for floor finishing comprising hydraulic cement, aggregate, epoxy resin, water-based epoxy resin curing agent and non-aqueous epoxy resin curing agent. The weight ratio of water to hydraulic cement is 0.1 to 0.4, and the resin is obtained by adding a water-based epoxy resin curing agent and a non-aqueous epoxy resin curing agent that react with the epoxy resin to the epoxy resin. The weight of resin solids in the case is 40 to 60% based on the weight of the total composition containing water, and the aggregate is 20 to 50 parts by weight based on 100 parts by weight of the entire composition. A hydraulic epoxy resin mortar composition for floor finishing is provided.

In the invention according to claim 2, the epoxy resin is a non-emulsifying epoxy resin, the aqueous epoxy resin curing agent is a self-emulsifying epoxy resin curing agent, and the non-aqueous epoxy resin curing agent is a non-self-emulsifying epoxy resin. A hydraulic epoxy resin mortar composition for floor finishing according to claim 1, characterized in that it is an emulsifying type epoxy resin curing agent.

The invention according to claim 3 is characterized in that the hydraulic epoxy resin mortar composition for floor finishing according to claim 1 or claim 2 is applied to the surface of the base concrete in an amount of 2.0 to 4.0 kg/m ² . A method of applying a hydraulic epoxy resin mortar composition for floor finishing is provided.

The hydraulic epoxy resin mortar composition for floor finishing of the present invention has a higher resin solid weight than conventional hydraulic epoxy resin mortar compositions for floor finishing, and contains a non-aqueous epoxy resin curing agent as a curing agent. It cures quickly in a low temperature environment of about 5°C, and even if it is applied in an environment of 5°C, it has the effect of being able to walk on the applied composition on the next day after application.

In addition, since the aggregate consists of No. 7 silica sand with an average particle size of around 150 μm, the coating film surface remains smooth even if the underlying concrete has unevenness or local protrusions. It has the effect of providing a good finish.

In addition, the hydraulic epoxy resin mortar composition for floor finishing of the present invention contains a hydraulic cement and is obtained by adding a water-based epoxy resin curing agent and a non-aqueous epoxy resin curing agent to the epoxy resin, which reacts with the epoxy resin. Since the weight of the resin solid content is as high as 40 to 60% of the weight of the entire composition containing water, it has the effect of having high adhesion to the base concrete, and does not contain conventional hydraulic cement. Unlike thick-film epoxy resin-based floor coverings, it has the effect of eliminating the need to apply a solvent-type or water-based primer in order to obtain adhesion to the underlying concrete. In addition, as a result, the number of steps for forming a coating floor on the surface of the base concrete is basically one step for applying the hydraulic epoxy resin mortar composition for floor finishing of the present invention, which is less labor and less costly than conventional. There is an effect that it is a cost.

In addition, the floor coating applied by the method of applying the hydraulic epoxy resin mortar composition for floor finishing according to claim 3 similarly cures quickly in a low temperature environment of about 5°C, and can be applied in an environment of 5°C. Even if it is possible to walk on the applied composition the day after application, and even if the underlying concrete has unevenness or local protrusions, the coating film surface is in a smooth state. In addition, since the coating floor can be formed on the surface of the base concrete in one process, there is an effect that it is possible to finish in a short process and at a low cost.

The hydraulic epoxy resin mortar composition for floor finishing of the present invention is a hydraulic epoxy resin mortar composition for floor finishing containing a hydraulic cement, an aggregate, an epoxy resin, a water-based epoxy resin curing agent and a non-aqueous epoxy resin curing agent. The weight ratio of water to hydraulic cement is 0.1 to 0.4, and the resin is obtained by adding a water-based epoxy resin curing agent and a non-aqueous epoxy resin curing agent that react with the epoxy resin to the epoxy resin. The weight of resin solids in the case is 40 to 60% based on the weight of the total composition containing water, and the aggregate is 20 to 50 parts by weight based on 100 parts by weight of the entire composition. This is a hydraulic epoxy resin mortar composition for floor finishing, which is applied directly to the surface of the base concrete and cured to form a coating layer on the surface of the base concrete and to form a finished floor as it is.

The hydraulic cement used in the present invention is a hydraulic pozzolan component, and various Portland cements such as ordinary Portland cement, high-early-strength Portland cement, moderate-heat Portland cement, sulfate-resistant Portland cement, white Portland cement, etc. Mixed cement such as blast furnace cement, silica cement and fly ash cement, aluminate lime cement, silicate aluminate lime cement, phosphate cement, etc., and metakaolin, which is a hydraulic pozzolan, can be used. Among these, white cement, that is, white Portland cement, is particularly preferred because it is easy to obtain a desired color as a finishing material, and the fluidity of the composition is good, resulting in good construction workability of the composition.

The aggregate used in the present invention can be used in the composition of the present invention as long as it can be used by mixing with a normal hydraulic material. Silica sand No. 7 is preferable, and since the weight ratio of the hydraulic cement to water and the weight of resin solids relative to the weight of all solids determine the ingredients and the amount to be added, it is actually the remaining ingredient. As long as the aggregate has the same particle size, the same effect can be obtained, but silica sand is the most suitable from the viewpoint of cost and availability. If it is finer than No. 7 of JIS G5901, the viscosity becomes high, and the self-leveling property and trowel workability are lowered. Commercially available JIS G5901 No. 7 silica sand and Tohoku silica sand No. 7 (both trade names, Kitanihon Sangyo Co., Ltd., trade name, average particle diameter (meaning the diameter of particles whose integrated value by weight is 50%): 185 μm). It is preferable to mix No. 7 silica sand as the aggregate to be mixed in the present composition.

Epoxy resins used in the present invention are liquid and can be cured at room temperature. , naphthalene-type epoxy resins, alicyclic epoxy resins, glycidyl ester-type epoxy resins, glycidylamine-type epoxy resins, heterocyclic epoxy resins, diarylsulfone-type epoxy resins, hydroquinone-type epoxy resins, modified products thereof, etc. alone or in combination. It may be used as a liquid, or may be liquefied using a diluent. Further, it is preferable that the epoxy resin is not emulsified and is insoluble in water, and is called a non-emulsified type in the present application. The softening point of the epoxy resin that is most often blended is preferably 35° C. or lower, and as such a liquid epoxy resin, a liquid bisphenol A type epoxy resin is suitable for versatility, cost, and the like. Examples of commercially available epoxy resin compositions include Jolyace JEX210A (epoxy resin manufactured by Aica Kogyo Co., Ltd., trade name, epoxy equivalent: 180, solid content: 100%, viscosity: 0.7 Pa·s/25°C). .

The water-based epoxy resin curing agent used in the present invention may be any one as long as it can be mixed with the epoxy resin and can disperse water well. or used in combination.

Aliphatic polyamines are aliphatic compounds having at least two amino groups and imino groups in the molecule, and include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, diethylaminopropylamine, hexamethylenediamine, trimethylhexa methylenediamine, polyoxypropylenediamine, iminobishexylamine, and the like.

Alicyclic polyamines are alicyclic compounds having at least two amino groups and imino groups in the molecule, and include xylylenediamine, 3,9 bis(3-aminopropyl)-2,4,8,10 tetra oxaspiro[5,5]undecane, N-aminoethylpiperazine, bis(4-aminocyclohexyl)methane and the like.

In addition, a hydrophilic main chain such as polyether is introduced into an epoxy resin, and an excess amine is reacted with a self-emulsifying curing agent, an ethylene oxide adduct of an aliphatic polyamine, an epoxy resin adduct, a modified polyethylene polyamine, etc. Monoglycidyl ether adducts of modified aliphatic polyamines and cycloaliphatic polyamines, epoxy resin adducts, acrylonitrile adducts, phenol formalin modified products (Mannich modified products), modified alicyclic polyamines and polyethylenes of fatty acid glycidyl ether adducts Examples include fatty acid to polyamine, dimer acid to polyethylene polyamine, polyamidoamine which is a condensation reaction product of xylylenediamine-dimer acid, and modified products thereof. Examples of commercially available products of the self-emulsifying curing agent include Jolyace JEX210B (epoxy resin curing agent manufactured by Aica Kogyo Co., Ltd., trade name, active hydrogen equivalent: 750, solid content: 18% aqueous solution, viscosity: 7 mPa·s/25°C). be done.

The non-aqueous epoxy resin curing agent used in the present invention disperses water well like the water-based epoxy resin curing agent described above, but is not a so-called self-emulsifying epoxy resin curing agent and cannot disperse water well. It is a non-self-emulsifying epoxy resin curing agent, and the above aliphatic polyamines, alicyclic polyamines, etc. are selected and used alone or in combination. Regarding the non-aqueous epoxy resin curing agent, similarly to the water-based epoxy resin curing agent, an epoxy resin adduct obtained by introducing an epoxy resin and reacting excess amine, modified aliphatic polyamine such as polyethylene polyamine modified product, and polyethylene polyamine. Dimer acid, polyamidoamine which is a condensation reaction product of xylylenediamine-dimer acid, and modified products thereof can be used.

The hydraulic epoxy resin mortar composition for floor finishing of the present invention has a weight ratio of water to hydraulic cement (water/hydraulic component, generally referred to as W/C) of 0.1 to 0.4. When it is below, the cured product becomes firm, and specifically, the compressive strength after curing becomes 21 N/mm ² or more. If the weight ratio of hydraulic cement to water (water/hydraulic content) is less than 0.1, the impact resistance may decrease, and if it exceeds 0.4, the self-leveling property will decrease and the coating surface will be smooth. may not be

In the hydraulic epoxy resin mortar composition for floor finishing of the present invention, the resin solid content when the resin is obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin with respect to the weight of the entire composition containing water The weight is preferably 40% to 60%. If it is less than 40%, curing in a low temperature environment of about 5°C may not be slow. The construction workability at the time of attaching may decrease.

The equivalent ratio of the epoxy equivalent of the epoxy resin to the active hydrogen equivalent of the aqueous epoxy resin curing agent and the non-aqueous epoxy resin curing agent is preferably 0.7 to 1.3. Compressive strength may be insufficient, and if it exceeds 1.3, the finish of the coating film surface may be poor due to excess amine or the like.

In addition, an AE water reducing agent, a curing accelerator, an antifoaming agent, a dispersing agent, etc. can be blended as materials used in the present composition.

AE water reducing agents include anionic, nonionic, cationic or zwitterionic AE agents and ligninsulfonate-based, higher polyhydric alcohol sulfonate-based, oxyorganic acids, alkylarylsulfonates, Polyoxyethylene alkyl ether-based, polycarboxylic acid-based, or polyol complex water-reducing agents, and combinations or mixtures thereof can be used. There are acid-based high performance AE water reducing agents. Melflux AP101F (manufactured by Degussa Construction Co., Ltd.) is a commercial example of a modified polycarboxylic acid-based AE water reducing agent, and Melflux 2641F (a commercial example of a polyether/polycarboxylic acid-based high-performance AE water reducing agent is Degussa Construction Co., Ltd., trade name). 0.1 to 1 part by weight of these AE water reducing agents are added to 100 parts of hydraulic cement to lower the viscosity of the composition. I value can be lowered.

Curing accelerators can be added to accelerate the reaction between the epoxy resin and the non-aqueous epoxy resin curing agent. Examples include tertiary amines such as 2,4,6-tris(dimethylaminomethyl)phenol , phenol, cresol, nonylphenol, styrenated phenol, and alkylphenols such as p-tert-butylphenol.

Antifoaming agents, dispersing agents and the like can be appropriately selected from those generally used in coating compositions and floor coating compositions.

The composition is mainly composed of epoxy resin, water-based epoxy resin curing agent, non-aqueous epoxy resin curing agent, water, hydraulic cement, and aggregate. It is preferable when In other words, epoxy resin, water-based epoxy resin curing agent and non-aqueous epoxy resin curing agent and water, and aggregate and hydraulic cement are used to prevent insufficient mixing/dispersion, deactivation of properties, and measurement errors/errors. Although preferred, they may be formulated separately.

The composition of the present invention is preferably applied to the base concrete in an amount of 2 to 4 kg/m ² , and if the amount is less than ² kg/m ² and more than 4 kg/m 2 , the surface finish may be poor.

Examples and comparative examples will be described in detail below.

<Examples and Comparative Examples>
Tohoku Silica Sand No. 7 (same as the particle size division of JISG5901:2016) was used as the aggregate. Tohoku Silica Sand No. 7 has a particle size of 0.212 mm to 0.045 mm (average particle size D ₅₀ : 185 μm, specific gravity 2.58). As epoxy resin A, bisphenol A type liquid epoxy resin jER828 (epoxy equivalent 190, solid content 100%, trade name, manufactured by Mitsubishi Chemical Corporation), as epoxy resin B, Joriace JEX210A (epoxy resin manufactured by Aica Kogyo Co., Ltd., trade name , epoxy equivalent 180, solid content 100%, viscosity 0.7 Pa s / 25 ° C.) as water-based epoxy resin curing agent A, Ancamine 670 (trade name, active hydrogen equivalent 220, water-based modified aliphatic polyamine, solid content 65 % aqueous solution, manufactured by Evonik) was used as a water-based epoxy resin curing agent B, and Jolyace JEX210B (epoxy resin curing agent manufactured by Aica Kogyo Co., Ltd., trade name, active hydrogen equivalent 750, solid content 18% aqueous solution, viscosity 7 mPa s /25°C), Ancamine 2089K (active hydrogen equivalent 75, non-aqueous modified aliphatic polyamine, p-tert-butylphenol 50%) is used as a non-aqueous epoxy resin curing agent, and white cement (Taiheiyo Hydraulic epoxy resin mortar compositions for floor finishing of Examples and Comparative Examples were prepared using white Portland cement manufactured by Cement Co., Ltd. according to the formulations shown in Table 1.

<Evaluation items and evaluation methods>

<Weight ratio of water to hydraulic cement>
The weight ratio of water to hydraulic cement was calculated from the water contained in the hydraulic cement and the water-based epoxy resin curing agent.

<Resin amount>
The ratio of the weight of the resin solid content to the weight of the entire composition of the present invention containing water, when the resin solid content is the sum of the solid content of the water-based epoxy resin curing agent and the non-aqueous epoxy resin curing agent to the epoxy resin. (%) was calculated.

<Coating film curability>
The compositions of Examples and Comparative Examples left at 23° C. and 5° C. for 24 hours or more were applied to a 300 mm×300 mm×60 mm concrete flat plate (substrate) defined in JISA5371 (the surface was sanded with sandpaper (No. 180) and thoroughly cleaned) to a thickness of about 2 mm (amount of application: 3.0 kg/m ² ). Shore D hardness was measured according to JIS K 7215 24 hours after application, and 60 or more was evaluated as ◯ at each temperature, and less than 60 was evaluated as x.

<Surface smoothness>
A flexible plate of 90 x 90 cm with a thickness of 8 mm was placed horizontally, and the compositions of Examples and Comparative Examples were applied at 3.0 kg/m ² with a metal trowel, and after curing, the coating film was cured from a height of 1 m. Visually observe the surface. A smooth surface without uneven distribution of aggregates, pinholes, craters, or other surface defects in the coating film was evaluated as ◯, and other than this was evaluated as x.

<Coating workability>
A flexible plate of 90×90 cm and 8 mm thick is placed horizontally, and the compositions of Examples and Comparative Examples are applied to it with a metal trowel at a coating amount of 3.0 kg/m ² . Sensory evaluation was carried out on all of them as blindfolded samples, and the ones where the metal iron was not heavy were rated as ◯, and the other ones were rated as x. Here, the trowel is not heavy when the force applied to the trowel is about 1N or less.

<Compressive strength>
The shape of the test piece is 12.7 mm long x 12.7 mm wide x 25.4 mm high as defined in JISK6911, and the uniformly mixed materials of Examples and Comparative Examples are filled in a mold of the same shape. It was molded by After curing in the mold for 7 days, the test piece was removed from the mold and used as a test piece. A load is applied with a universal testing machine (Instron 5500R) at a crosshead moving speed of 1 ± 0.5 mm / min, and the load (N) when the test piece breaks is measured and the compressive strength (N / mm ² ) is calculated. Calculated. A compressive strength of 21 N/mm ² or more was evaluated as ◯, and other than this was evaluated as x.

<Adhesion>
A pavement board (300 x 300 x 60 mm) specified in JIS A 5371 was used as the base, and the compositions of Examples and Comparative Examples were applied at 3.0 kg/m ² at 20°C and 50% RH, and cured for 7 days. and used as a test specimen. After that, an adhesion test was performed with a construction research type tensile tester, and the adhesion strength was 2.0 N / mm ² or more, and the failure mode at that time was evaluated as 〇 for cohesive failure of the pavement board, and as × for others. bottom.

<Impact resistance>
A pavement board (300 x 300 x 60 mm) specified in JIS A 5371 was used as the base, and the compositions of Examples and Comparative Examples were applied at 3.0 kg/m ² at 20°C and 50% RH, and cured for 7 days. and used as a test specimen. According to NNK-0002, the specimen was subjected to a falling ball impact test (a 1 kg steel ball dropped by 1 m), and the number of falling balls that caused cracks in the pavement board or the number of falling balls that caused cracks in the coating film was measured and measured 10 times or more. was evaluated as ◯, and less than 10 times as x.

Table 2 shows the evaluation results of Examples and Comparative Examples.

Claims (3)

A hydraulic epoxy resin mortar composition for floor finishing comprising a hydraulic cement, an aggregate, an epoxy resin, an aqueous epoxy resin curing agent and a non-aqueous epoxy resin curing agent, wherein the weight ratio of water to hydraulic cement is 0.1. ∼0.4, and the solid content weight of the epoxy resin when the resin is obtained by adding an aqueous epoxy resin curing agent that reacts with the epoxy resin and a non-aqueous epoxy resin curing agent to the epoxy resin. A hydraulic epoxy resin mortar composition for floor finishing, characterized by comprising 40 to 60% by weight of the aggregate and 20 to 50 parts by weight of the aggregate relative to 100 parts by weight of the entire composition. The epoxy resin is a non-emulsifying epoxy resin, the aqueous epoxy resin curing agent is a self-emulsifying epoxy resin curing agent, and the non-aqueous epoxy resin curing agent is a non-self-emulsifying epoxy resin curing agent. The hydraulic epoxy resin mortar composition for floor finishing according to claim 1, characterized by: A hydraulic epoxy resin mortar composition for floor finishing, characterized in that the hydraulic epoxy resin mortar composition for floor finishing according to claim 1 or claim 2 is applied to the surface of base concrete in an amount of 2.0 to 4.0 kg/m ² . construction method.