JP5952061B2 - Floor concrete finishing structure and floor concrete finishing method - Google Patents

Description

  The present invention relates to a coating composition which is cured after applying a coating composition which is a water-based epoxy resin mortar composition containing hydraulic cement, aggregate and water-based epoxy resin to the surface of the floor concrete, so-called ground preparation. The present invention relates to a floor concrete finishing structure and a floor concrete finishing method in which a solvent-free urethane resin finishing material is applied onto the floor and finished.

  Conventionally, a water-based epoxy resin mortar composition containing hydraulic cement, aggregate and water-based epoxy resin on the floor concrete surface, the weight ratio of hydraulic cement to water being 0.3 to 0.4, The resin solid weight of the resin when added with a curing agent that reacts with the epoxy resin is 4% or more and 10% or less with respect to the weight of the total formulation including water. Pore amount is 0.05 cc / g or more and 0.2 cc / g or less, T.I. A concrete floor construction method for applying a coating material composition having an I value of 1.0 to 1.5 has been proposed (Patent Document 1).

Japanese Patent No. 4794007

  However, since the coating material composition shown in Patent Document 1 is a water-based epoxy resin mortar composition, the amine that is a curing agent for the epoxy resin contained therein contains carbon dioxide gas contained in the blended water. There is a case where a large amount of amine carbonate, which is the main component of the curing agent for the epoxy resin, is present on the surface of the coating material composition upon reaction and carbonation. The specific use of the coating composition is for the preparation of the foundation of the foundation concrete, and a solvent-free urethane resin finish can be further applied on the coating composition. In the case where it is considered that a large amount of the carbonate of the amine is present, there is a problem that the adhesion of the solventless urethane resin finishing material applied thereon is lowered.

  In addition, since the weight ratio of hydraulic cement to water is as low as 0.3 or more and 0.4 or less in the coating material composition disclosed in Patent Document 1, the surface of the foundation concrete is apparent when applied to the foundation concrete. When it is dry, part of the water in the coating composition is sucked into the surface of the underlying concrete, and as a result, fine voids are formed in the coating composition, and the coating composition is cured in that state. However, the fine voids after curing become a path for moisture to be subsequently supplied from the base, and as a result, there is a problem that the adhesion of the solventless urethane resin finishing material applied thereon is lowered.

  The problem to be solved by the present invention is a water-based epoxy resin mortar composition containing a hydraulic cement, an aggregate, and a water-based epoxy resin, wherein the weight ratio of the hydraulic cement to water is 0.3 to 0.4. The resin solid content weight of the resin obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin is 4% or more and 10% or less, based on the weight of the total formulation including water, and cured. The total pore amount of the product is 0.05 cc / g or more and 0.2 cc / g or less, T.I. An amine carbonate which is a main component of a curing agent for an epoxy resin on the surface of a cured coating composition when a coating composition having an I value of 1.0 to 1.5 is applied to the floor concrete surface Provides a floor concrete finishing structure and a floor concrete finishing method with good adhesion of a solvent-free urethane resin finish applied on top of this, and the water content in the coating composition is reduced. It is not sucked into the base and does not cause fine voids in the coating composition after curing, resulting in a decrease in the adhesion of the solventless urethane resin finish applied on the coating composition, and Floor concrete finishing structure and floor concrete finishing method in which even if fine voids occur in the coating composition, the adhesion of the solventless urethane resin finish applied on the coating composition does not deteriorate It is to provide.

The invention according to claim 1 includes a layer obtained by applying and curing a water-based epoxy resin cement composition comprising a water-based epoxy resin and a hydraulic cement on the foundation concrete, a hydraulic cement, an aggregate, and a water-based epoxy resin. A water-based epoxy resin mortar composition having a weight ratio of hydraulic cement to water of 0.3 to 0.4, and a resin obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin. The resin solid content weight of the resin is 4% or more and 10% or less with respect to the weight of the total formulation including water, the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less, An aqueous system comprising a layer obtained by applying 0.8 to 2.0 kg / m ² of a coating material composition having an I value of 1.0 to 1.5 and curing, and a hydraulic cement and an aqueous urethane resin thereon. Urethane resin cement composition is 0.08-0. The floor concrete finish structure is characterized by comprising a layer cured by applying 15 kg / m ² and a solventless urethane resin finish layer formed thereon.

The invention according to claim 2 is a water-based epoxy resin containing a water-based cement, an aggregate, and a water-based epoxy resin by applying and curing a water-based epoxy resin cement composition comprising a water-based epoxy resin and a water-based cement on the ground concrete. Resin of the mortar composition in which the weight ratio of hydraulic cement to water is 0.3 to 0.4, and the epoxy resin is added with a curing agent that reacts with the epoxy resin. The solid content weight is 4% or more and 10% or less with respect to the weight of the total formulation including water, the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less. A water-based urethane resin cement composed of a hydraulic cement and a water-based urethane resin on which a coating material composition having an I value of 1.0 to 1.5 is applied and cured at 0.8 to 2.0 kg / m ^2. The composition is 0.08-0. It is a floor concrete finishing method characterized in that 15 kg / m ^{2 is applied} and cured, and further a solvent-free urethane resin finishing material layer is formed thereon.

  A floor concrete finishing structure and a floor concrete finishing method according to the present invention are water-based epoxy resin mortar compositions containing hydraulic cement, aggregate, and water-based epoxy resin, and the weight ratio of hydraulic cement to water is 0.3 or more. 0.4 or less, when the resin is a resin obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin, the resin solid content weight of the resin is 4% or more with respect to the weight of the total formulation including water 10% or less, the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less. In a coating material composition having an I value of 1.0 to 1.5, for example, even when a solventless urethane resin finish is applied on the coating composition cured at a low temperature, the solventless There is an effect that the adhesion of the base urethane resin finish is good.

The floor concrete finishing structure and floor concrete finishing method according to the present invention include an aqueous epoxy resin cement composition layer, an aqueous epoxy resin mortar composition layer, an aqueous urethane resin cement composition layer, and a solventless urethane resin finishing material layer. Therefore, the material used in the construction process does not contain a solvent, and therefore it has the effect of reducing the health of the craftsman who is the builder, and the environmental load that the solvent gives does not occur. is there.

In addition, the floor concrete finishing structure and floor concrete finishing method according to the present invention prevents the permeation of moisture rising from the base concrete to the back surface of the solventless urethane resin finishing material, and prevents problems such as peeling and swelling on the finishing material. There is an effect that does not occur. The I value is as low as 1.0 to 1.5, and there is an effect of having self-leveling properties.

  The present invention will be described in detail below.

  In the floor concrete finished structure of the present invention, a water-based epoxy resin cement composition comprising a water-based epoxy resin and a hydraulic cement is first applied and cured on the base concrete. The water-based epoxy resin cement composition fills voids on the surface of the underlying concrete, and when a coating material composition that is a water-based epoxy resin mortar composition to be applied next is applied, the water content in the coating material composition is reduced. Water is absorbed by the base concrete, and fine voids are formed in the coating composition due to the influence. Further, the coating composition is cured in that state, and the fine voids after curing become a path for moisture supplied from the base. As a result, the solventless urethane resin finish applied to the upper layer of the coating composition effectively prevents the adhesive force from becoming insufficient due to moisture that has passed through the fine voids.

  In the present invention, a water-based urethane resin cement composition comprising a hydraulic cement and a water-based urethane resin is applied to the upper layer of the coating material composition even if fine voids after curing exist in the coating material composition. Therefore, moisture that passes through the fine voids in the coating material composition is adsorbed by the unhydrated cement in the aqueous urethane resin cement composition and is blocked by this layer.

  Thus, in the present invention, the movement of moisture from the base concrete to the back surface of the solventless urethane resin finishing layer is divided into the water-based epoxy resin cement composition layer, the coating material composition layer, and the water-based urethane resin cement composition layer. One of the major features of this is that it is blocked by the layer, and this configuration is a groundbreaking unprecedented.

A water-based epoxy resin cement composition comprising a water-based epoxy resin and a hydraulic cement is applied to seal the base as described above, and a water-based epoxy comprising an epoxy resin and a water-based curing agent described in Japanese Patent No. 4794007. Hydraulic cement is added to the resin and mixed by stirring to make it uniform. The hydraulic cement is preferably blended in an amount of 50 to 200 parts by weight, more preferably 75 to 150 parts by weight, based on 100 parts by weight of the water-based epoxy resin. If it is less than 50 parts by weight, the curing of the filler is insufficient, and if it exceeds 200 parts by weight, the workability becomes poor. If it is less than 75 parts by weight, the curing of the filler tends to be insufficient, and if it exceeds 150 parts by weight, the workability tends to be poor. In the construction, it is coated with rubbing so as to be rubbed with a hammer or the like, and the coating amount is preferably 0.05 to 0.3 kg / m ² . 0.05kg / In ^m less than ² is insufficient the sealing of the base, in the 0.3kg / ^{m 2} than can not be ironing painted.

  Hydraulic cements include commercially available ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, white Portland cement and other Portland cements, blast furnace cement, silica cement, fly ash cement and other mixed cements. Further, calcareous aluminate, calcareous aluminate calcareous cement, phosphate cement and the like can be used.

On the hardened water-based epoxy resin cement composition is a water-based epoxy resin mortar composition containing a hydraulic cement, aggregate, and water-based epoxy resin, and the weight ratio of the hydraulic cement to water is 0.3 or more and 0.00. 4 or less, when the resin is a resin obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin, the resin solid content weight of the resin is 4% or more and 10% with respect to the weight of the total formulation including water. Hereinafter, the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less. A coating material composition having an I value of 1.0 to 1.5 is applied to 0.8 to 2.0 kg / m ² to form a cured layer. The water-based epoxy resin and water-based epoxy resin mortar composition are water-based epoxy resins or water-based epoxy resin mortar compositions described in Japanese Patent No. 4794007.

  The water-based epoxy resin used in the coating composition which is a water-based epoxy resin mortar composition is mixed with the epoxy resin described in Japanese Patent No. 4794007 in the same manner as the water-based epoxy resin cement composition. A mixture with an aqueous curing agent that can be dispersed in the epoxy resin and the epoxy resin and the aqueous curing agent are those described in this publication. As a commercially available product of epoxy resin, Jolieth JEX210A (epoxy resin manufactured by Aika Kogyo Co., Ltd., epoxy equivalent 180, solid content 100%, viscosity 0.7 Pa · s / 25 ° C.) is mentioned as specified in the publication. As a commercial product of a water-based curing agent and a self-emulsifying curing agent, as described in the publication, Jolie's JEX210B (epoxy resin curing agent manufactured by Aika Industry Co., Ltd., trade name, active hydrogen equivalent 750, solid 18% aqueous solution, viscosity 7 mPa · s / 25 ° C.).

The weight ratio of hydraulic cement to water in the water-based epoxy resin mortar composition is a weight ratio of water / hydraulic cement, and is generally referred to as W / C. The total amount of pores means the total amount of very small holes of several nanometers to several tens of micrometers in the coating composition, and the pore distribution is determined from the injection pressure and injection amount of mercury by the mercury intrusion method. This is the sum of the volume (pore volume) for each radius. T.A. The I value is a value obtained by dividing the viscosity of 2 rpm of the BH type rotational viscometer by the viscosity of 20 rpm in accordance with the thixotropic index test method of JIS A6024. T.A. When the I value is less than 1.0, the aggregate containing cement rapidly settles. When the I value exceeds 1.5, the self-leveling property is lowered, and a wave remains after it is applied with a scissors. The viscosity of the coating composition is preferably 0.3 Pa · s or more and 8 Pa · s or less at No. 4 rotor 20 rpm with a BH viscometer from the viewpoint of workability, and the viscosity is 0.3 Pa · s. If it is less than s and more than 8 Pa · s, the cocoon judgment is poor.

  The coating composition which is a water-based epoxy resin mortar composition has a fine pore structure after curing, as specified in Japanese Patent No. 4794007, and the water permeability of the JISA 6909 water permeability test B method is also 0. Since it is 2 ml or less, even if the foundation concrete contains a lot of moisture, the moisture is confined by the coating composition, and since it contains hydraulic cement and epoxy resin, it is extremely adherent to the foundation concrete wet with water. It is good.

  As with the water-based epoxy resin cement composition, the hydraulic cement used in the coating composition, which is a water-based epoxy resin mortar composition, is commercially available ordinary Portland cement, early strong Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement. In addition, various portland cements such as cement and white portland cement, mixed cements such as blast furnace cement, silica cement, fly ash cement, aluminate calcareous cement, silicic acid aluminate calcareous cement, phosphate cement and the like can be used. In particular, in the coating material composition, white cement, that is, white Portland cement, is preferable in terms of good fluidity.

  The aggregate used in the coating composition which is a water-based epoxy resin mortar composition may be any material that can be used by mixing with a hydraulic material. However, in order to have self-leveling properties, JIS G5901 Nos. 48 to 150 No. 1 is preferable, and since the blending component and blending amount are determined by the weight ratio of the hydraulic cement and water and the resin solid content weight with respect to the total solid weight, it is actually the remaining component. If aggregates have the same particle size, etc., the same effect can be obtained, but silica and sand are the optimal because of cost and availability. If it is finer than JIS G5901, No. 150, the viscosity will be high, and the self-leveling property and dredging workability will be reduced. If it is larger than 48, the surface finish will be inferior due to strength, cracks due to shrinkage, and unevenness of the aggregate. Commercially available products include Tohoku silica sand Nos. 6 and 7 (North Japan Industrial Co., Ltd., trade name).

  As other materials, an AE water reducing agent can be blended with the coating composition which is an aqueous epoxy resin mortar composition, and the AE water reducing agent described in paragraph 0045 of Japanese Patent No. 4794007 is used. be able to.

  As the mixing form of the coating composition, which is a water-based epoxy resin mortar composition, the epoxy resin, water-based curing agent, water, hydraulic component, and aggregate are the main compounds. It is preferable in use. In other words, water-based curing agent and water, epoxy resin, aggregate and hydraulic component are preferable to prevent insufficient mixing / dispersion, deactivation of characteristics, measurement error / error, I do not care.

The water-based epoxy resin mortar composition has a weight ratio of hydraulic cement to water of 0.3 to 0.4 and a resin solid content weight of 4% to 10% with respect to the total solid weight. The total pore volume of the cured product is 0.05 cc / g or more and 0.2 cc / g or less, and the adhesion with the ground concrete is good, and the water system composed of hydraulic cement and water-based urethane resin is layered. Adhesion with the urethane resin cement composition is good. In addition, the moisture rising from the base concrete is prevented from permeating to the back of the solventless urethane resin finish layer, resulting in a tough floor structure. As no blisters occur.

  In addition, as disclosed in Japanese Patent No. 4794007, the water-based epoxy resin mortar composition is a resin solid state of a resin obtained by adding a curing agent that reacts with the epoxy resin to the epoxy resin. The weight is 4% or more and 10% or less based on the weight of the total formulation including water, and the T.I. Since the I value is from 1.0 to 1.5, the handling during construction is good and the self-leveling property is good.

Coat-weight of the water-based epoxy resin mortar composition is 0.8~2.0kg / ^{m 2,} 0.8kg / ^m is less than ² water-borne urethane resin cement composition is layered over this and solventless urethane resin Adhesiveness with the finishing layer becomes insufficient, and when it exceeds 2.0 kg / m ² , the strength of the cured surface of the epoxy resin mortar composition becomes insufficient, and the water-based urethane resin cement composition layered thereon is similarly Adhesion with the solventless urethane resin finish layer becomes insufficient.

On the hardened layer of the water-based epoxy resin mortar composition, a water-based urethane resin cement composition composed of hydraulic cement and water-based urethane resin is applied and cured to form a layer. The hydraulic cement used for the water-based urethane resin cement composition is not particularly limited. Commercially available hydraulic cements include, for example, early-strength Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, white Portland cement and other Portland cements, blast furnace cement, silica cement, fly ash cement and other mixed cements, and aluminium. There are acid limestone cement, silicate aluminate calcareous cement, phosphate cement and the like.

  The water-based urethane resin is composed of a main agent composed of an aqueous polyol or a water-dispersible polyol and a curing agent that is a compound having two or more isocyanate groups.

As the aqueous polyol, polyhydroxy compounds such as ethylene glycol, diethylene glycol, butanediol, propylene glycol, hexanediol glycerin, pentaerythritol and other polyhydric alcohols or oxyalkylene derivatives and polyhydric carboxylic acids, polyhydric carboxylic acid anhydrides, or polyhydric compounds are used. Examples include ester compounds obtained from monovalent carboxylic acid esters, polyol compounds such as polycarbonate polyol, polycaprolactone polyol, polyester polyol, polyacetal polyol, castor oil polyol, and modified products thereof.

A water-dispersible polyol is a resin that can be dispersed in water having a hydroxyl group, such as methacrylic acid 2-hydroxyethyl ester, methacrylic acid 2-hydroxypropyl ester, methacrylic acid 2-hydroxypropyl ester, etc. as a hydroxyl group-containing component. Acrylic copolymer-based polyols prepared by emulsion polymerization of at least one unsaturated compound selected from unsaturated compounds such as acrylonitrile, methacrylic acid, and alkyl methacrylates containing at least one kind, and aromatic , Aliphatic, alicyclic diisocyanates or isocyanate oligomers using them and polyhydric alcohols such as polyethylene glycol, polypropylene glycol, trimethylolpropane, pentaerythritol, sorbitol, or bishydroxypropyl Urethane reaction of at least one alcohol compound selected from hydroxycarboxylic acids such as on-acid and hydroxyacetic acid, and urethane polyols, etc., where necessary neutralized carboxylic acid, other polyetherols, polyester polyols And the like. These can be dispersed in water using the emulsifying action of the surfactant. In addition, the time until tack-free can be shortened by adding 0.01 to 0.2% by weight of aqueous dibutyltin diurate as a curing aid to the main agent.

The compound having two or more isocyanate groups as a curing agent is preferably a polymer MDI such as polymeric diisocyanate, polymethylene / polyphenyl / polyisocyanate, etc., and having an NCO% of 15 to 35%.

  A preferable blending ratio of the water-based polyol or water-dispersible polyol, the isocyanate compound and the hydraulic cement is 80 to 120 parts by weight of the isocyanate compound and 50 to 150 parts by weight of the hydraulic cement with respect to 100 parts by weight of the water-based polyol or water-dispersible polyol. is there. If the hydraulic cement is less than 50 parts by weight, moisture absorption by the hydraulic cement is reduced, and the tendency of foaming due to the reaction between the isocyanate compound and moisture increases, which is not suitable. If it exceeds 150 parts by weight, the cement composition becomes too hard and the coating workability is lowered.

  Further, if the isocyanate compound is less than 80 parts by weight, the curability is inferior, which is not preferable. Conversely, if it exceeds 120 parts by weight, it reacts with moisture and tends to foam, which is not suitable. As a commercially available water-based urethane resin, JOLIES JJ-100A (water-dispersed castor oil-modified polyol, OH equivalent 560 g / eq, solid content 70%, trade name, manufactured by Aika Kogyo Co., Ltd.) is used as an aqueous polyol, and JOLIES is used as an isocyanate compound. JJ-100B (polymeric MDI, NCO wt%; 32%, manufactured by Aika Industries Co., Ltd.).

In the construction, since the main curing form of the water-based epoxy resin mortar composition as the underlayer is hydration, the water-based epoxy resin immediately after curing after the water-based epoxy resin mortar composition has been applied for about 24 hours. In some cases, unhydrated moisture may remain in the mortar composition layer, and the water-based urethane resin is also intended to adsorb the remaining moisture so as not to cause defects such as foaming due to the moisture. As a hydraulic cement. In addition to these purposes, the hydraulic cement is blended for the purpose of adsorbing moisture that has passed through the fine voids in the coating composition.

In the construction, it is uniformly applied on a coating material composition cured with a hammer, a brush, a roller brush, etc., and the coating amount is preferably 0.08 to 0.4 kg / m ² , more preferably 0.1. ~ 0.35 kg / m ² . If it is less than 0.08 kg / m ² , it is difficult to apply uniformly, and the adhesion of the solventless urethane resin finish layer applied on this is poor, and if it exceeds 0.4 kg / m ² , the coating workability is poor. It becomes. If it is less than 0.1 kg / m ² , it tends to be difficult to apply uniformly, so the adhesion of the solventless urethane resin finish layer applied on this tends to be poor, 0.35 kg / If it exceeds m ² , the coating workability tends to be poor.

  The floor concrete finishing structure and the floor concrete finishing method according to the present invention are: a water-based urethane resin cement composition is applied and cured, and then a solvent-free urethane resin finish is applied to the solvent-free urethane resin finishing layer. Form. Commercially available solvent-free urethane resin finishes include Aikapur JJ103 (trade name, manufactured by Aika Industry Co., Ltd.) as a hard type, and Joliath JU-20 (trade name, manufactured by Aika Industry Co., Ltd.) as a soft type. There is.

  In addition, the floor concrete finishing method of this invention is a construction method for forming the said floor concrete finishing structure, and is constructed by the method shown above.

  Hereinafter, the floor concrete finishing structure and the floor concrete finishing method according to the present application will be specifically described in Examples and Comparative Examples.

Example 1 and Example 2
Under an atmosphere of 23 ° C. and 50% RH, the stirrer was equipped with 100 parts by weight of Jolieth JEX210A (epoxy resin manufactured by Aika Kogyo Co., Ltd., trade name, epoxy equivalent 180, solid content 100%, viscosity 0.7 Pa · s / 25 ° C.) Add 400 parts by weight of Jolies JEX210B (epoxy resin curing agent, trade name, active hydrogen equivalent 750, solid content 18% aqueous solution, viscosity 7 mPa · s / 25 ° C., manufactured by Aika Kogyo Co., Ltd.) and 500 parts by weight of ordinary Portland cement The water-based epoxy resin cement composition that has been uniformly stirred and mixed is coated with 0.2 kg / m ² of JISA 5371-2010 precast unreinforced concrete product on a flat plate 300 × 300 × 60 mm with a hammer. The substrate before coating is polished with sandpaper # 120 to remove surface latency, and the surface moisture is measured, and the Ket moisture meter HI-500 or HI-520 (trade name, Kett Science Laboratory Co., Ltd.) It was confirmed that it was 5.0% or less at a concrete range of 40 mm.

After the water-based epoxy resin cement composition is cured, 100 parts by weight of the above-mentioned Jolie's JEX210A, 400 parts by weight of Jolie's JEX210B, 1265 parts by weight of silica sand (JIS silica sand No. 100), white cement (Pacific Cement Co., Ltd.) , White Portland cement) 2120 parts by weight and 415 parts by weight of water, and when mixing silica sand and white cement, 5 parts by weight of Mellux AP101F (Degussa Construction Co., Ltd., modified polycarboxylic acid-based water reducing agent, trade name) When blended, the weight ratio of hydraulic cement to water is 0.35, the resin solid weight is 4% of the total solid weight, the viscosity is 0.7 Pa · s / 23 ° C. A coating material composition having an I value of 1.3 (Example 7 in Japanese Patent No. 4794007) is applied with a hammer at a coating amount of 1.8 kg / m ² . As shown in Japanese Patent No. 4794007, the coating material composition has a total pore amount of a cured product of 0.15 cc / g.

One day after application, as a water-based urethane resin cement composition, 100 parts by weight of Jolieth JJ-100A (water dispersible castor oil-modified polyol, OH equivalent 560 g / eq, solid content 70%, trade name, manufactured by Aika Industry Co., Ltd.) 100 parts by weight of Jollyse JJ-100B (Polymeric MDI, NCO wt%; 32%, manufactured by Aika Kogyo Co., Ltd.) and 100 parts by weight of commercially available Portland cement were sufficiently stirred and mixed, and 0.15 kg / m ² was applied. . After the water-based urethane resin cement composition was cured, Example 1 was applied by applying 1.0 kg / m ^{2 of} Jolieth JU-20 (trade name, manufactured by Aika Kogyo Co., Ltd.) as a solvent-free urethane resin finish. In Example 1, after the aqueous epoxy resin mortar composition was cured, the entire cured surface was polished with sandpaper # 120, and then the aqueous urethane resin cement composition and the solventless urethane resin finish were applied in the same manner. Example 2 was adopted.

Comparative Example 1 and Comparative Example 2
Comparative Example 1 was obtained by applying the solvent-free urethane resin finish Jolie JU-20 directly to the cured surface of the water-based epoxy resin mortar composition without applying the water-based urethane resin cement composition in Example 1 above. Comparative Example 2 is the same as Example 2 except that the water-based urethane resin cement composition was not applied in the same manner, but the solventless urethane resin finishing material Joliase JU-20 was directly applied to the cured surface of the water-based epoxy resin mortar composition. did.

Evaluation items and evaluation methods

Normal adhesion The above Examples 1 and 2 and Comparative Examples 1 and 2 were cured at 23 ° C. for 7 days after applying a solventless urethane resin finish. The coating film around the coating film is removed so that the coating film of the solventless urethane resin finishing material remains in a shape of 30 mm × 50 mm. Comparative Examples 1 and 2 are provided at the interface between the finishing material on the short side (30 mm) of the finishing material (the coating material 10 in FIGS. 1 and 2) and the aqueous urethane resin cement composition layer in Examples 1 and 2. Then, the cutting edge 1 of the adhesion measuring device shown in FIGS. 1 and 2 is inserted into the interface with the water-based epoxy resin mortar composition layer, and the cutting edge 1 is loaded on the cutting edge 1 to load the cutting edge at the interface between the finishing material and each composition layer. 1 was further inserted and developed to peel off the finishing material, and the load at the time of peeling was used as the adhesive force to evaluate the adhesion. A front view of the adhesion measuring device is shown in FIG. 1, and a plan view thereof is shown in FIG. The blade edge angle was 11 °, and the measured value with this adhesive force measuring device was evaluated as ◯, 15N / cm or more was evaluated as ◯, 10N / cm or more less than 15N / cm was evaluated as Δ, and 10N / cm or less was evaluated as ×.

Water-resistant adhesion After applying the solvent-free urethane resin finishing material in Examples 1 and 2 and Comparative Examples 1 and 2 described above, they were cured at 23 ° C for 7 days, and further immersed in warm water at 35 ° C for 7 days. Then, it was taken out from the warm water, and immediately after, the finishing material was peeled off by an adhesive force measuring device in the same manner as described above, and the adhesion was evaluated using the load at the time of peeling as the adhesive force. Evaluation was made 15 N / cm or more as ◯, less than 15 N / cm and 10 N / cm or more as Δ, and less than 10 N / cm as x as normal adhesion.

  The evaluation results are shown in Table 1.

Summary In Example 1 and Example 2, both normal adhesion and water adhesion were good and evaluated as ◯, but in Comparative Examples 1 and 2, normal adhesion was △ evaluation, and in particular, water adhesion was evaluated as x. Met.

  The details of the concept of the adhesive force measuring instrument used in the evaluation of the normal state adhesiveness and water resistant adhesiveness are shown below.

  The adhesive force measuring device shown in FIG. 1 and FIG. 2 includes a cutting edge (cutting tool) 1, a support wheel 2 that holds the cutting edge 1 at an angle (11 ° in FIG. 1), and an object to be measured with the cutting edge 1 in the tip direction. The handle 3 is pressed against the coating material 10 side via the connecting rod 6 and the scale outer cylinder 8 and the instrument 4 (cylindrical spring balance) for measuring the maximum of the pressing force. The adhesive force measuring device applies the coating material 10 to the coating material 10 at the end of the coating material 10 which is the measurement object cut out to a predetermined width after the coating material 10 is applied to the coating material 11 and cured. The tip of the blade edge 1 is pressed against the adhesion interface of the object 11 while grasping the handle 3 by hand, and the maximum stress when the coating material 10 is peeled off from the object 11 is measured by the instrument 4 that measures the maximum pressing force. Is.

  In the instrument 4 for measuring the maximum pressing force, a scale inner cylinder 9 is slidably inscribed on a scale outer cylinder 8, and connecting rods 6 are fixed substantially vertically on the lower and front sides of the scale inner cylinder 9. A kawaski integrated with the cutting edge 1 is fixed to the connecting rod 6. The inner cylinder 9 is attached to the end of the outer balance 8 on the handle 3 side by a coil spring (not shown) inside the outer cylinder 8. Accordingly, the rear end portion (right side in FIG. 1) of the inner cylinder 9 protrudes from the open right end (right side in FIG. 1) of the balance outer cylinder 8, and when the cutting edge 1 is pressed against the coating material 10, the pressing force increases. The rear end portion of the inner cylinder 9 slides gradually away from the open right end of the outer cylinder 8. That is, the force with which the blade edge 1 is pressed against the coating material 10 is increased by the extension of the coil spring (not shown). At the time of measurement, the point at which the inner cylinder 9 slides to the maximum is that the cutting edge 1 is pressed against the coating material 10 with the greatest force, and the coating material 10 is peeled off from the article 11 at that time. The maximum sliding position of the inner cylinder 9 is attached to a predetermined position of the outer cylinder 8 by the placing needle 5, the coating material 10 is peeled off from the object 11 to be coated, and the inner cylinder 9 is in the outer cylinder 8. Even after all the components are stored in the state shown in FIG. Reference numeral 12 denotes a notch portion of the outer scale cylinder that is provided in a slender shape across the lower part of the outer scale cylinder 8. The notch 12 of the outer scale cylinder communicates with the connecting portion 6 to connect with the inner scale cylinder 9. It is fixed. Reference numeral 7 denotes a support wheel base for rotatably fixing the two support wheels 2 arranged on both sides, and is fixed to the lower side of the Kawasuki integrated with the blade edge 1. The angle of the blade edge 1 can be changed by moving the position of the support wheel 2 back and forth or changing the diameter of the support wheel 2. That is, the angle of the blade edge 1 can be reduced by moving the position of the support wheel 2 to the right in FIG. 1 or reducing the diameter of the support wheel 2.

  The instrument 4 for measuring the maximum pressing force uses a cylindrical spring balance in FIGS. 1 and 2, but may be a digital sensor type.

It is a front view of an adhesive force measuring device. It is a top view of an adhesive force measuring device.

1 Cutting edge (blade)
2 Support wheel 3 Handle (fixed to the balance outer cylinder)
4 Instrument for measuring maximum pressing force 5 Placement needle (needle showing maximum value)
6 Connecting rod (fix the blade and inner cylinder)
7 Support wheel base (change the angle to move back and forth in the direction of the blade edge)
8 Weighing outer cylinder 9 Weighing inner cylinder 10 Coating material 11 Object to be coated 12 Notch of scale outer cylinder

Claims (2)

A layer obtained by applying a water-based epoxy resin cement composition composed of a water-based epoxy resin and a hydraulic cement on an underlying concrete and curing, and a water-based epoxy resin mortar composition including the hydraulic cement, the aggregate, and the water-based epoxy resin. The weight ratio of the hydraulic cement to water is 0.3 to 0.4, and the resin solid weight of the resin when the epoxy resin is added with a curing agent that reacts with the epoxy resin, 4% or more and 10% or less based on the weight of the total formulation containing water, the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less, An aqueous system comprising a layer obtained by applying 0.8 to 2.0 kg / m ² of a coating material composition having an I value of 1.0 to 1.5 and curing, and a hydraulic cement and an aqueous urethane resin thereon. Urethane resin cement composition is 0.08-0. A floor concrete finishing structure comprising a layer cured by applying 15 kg / m ² and a solventless urethane resin finishing layer formed thereon. An aqueous epoxy resin mortar composition comprising a hydraulic cement, an aggregate, and an aqueous epoxy resin, coated with an aqueous epoxy resin cement composition comprising an aqueous epoxy resin and a hydraulic cement, and cured. When the weight ratio of hard cement to water is not less than 0.3 and not more than 0.4, and the resin is made by adding a curing agent that reacts with the epoxy resin to the epoxy resin, the resin solid content weight of the resin includes water. However, the total pore amount of the cured product is 0.05 cc / g or more and 0.2 cc / g or less, based on the weight of the total formulation. A water-based urethane resin cement composed of a hydraulic cement and a water-based urethane resin on which a coating material composition having an I value of 1.0 to 1.5 is applied and cured at 0.8 to 2.0 kg / m ^2. The composition is 0.08-0. 15. A floor concrete finishing method comprising applying 15 kg / m ² and curing, and further forming a solvent-free urethane resin finishing material layer thereon.

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