High-durability floor coating and its application method

Abstract

To provide a highly durable coating floor having excellent crack-following properties, yellowing resistance and AGV resistance, and excellent aesthetics, and to provide a construction method for the same.SOLUTION: A highly durable coated floor is formed by: applying a urethane resin-based flooring material composition containing polyol, polyisocyanate, a diluent, a dehydrating agent, and a filler over a base concrete surface or over a primer layer and / or a base preparation layer formed at least over the base concrete surface to form a urethane resin-based flooring material composition layer; and on a top thereof, applying a hydraulic polymer cement composition containing a water-dispersed polyol, polyisocyanate, an organometallic catalyst, a hydraulic cement, and an aggregate to form a hydraulic polymer cement composition layer.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a highly durable floor coating and a method for applying the same, characterized by forming a hydraulic polymer cement composition layer on top of a urethane resin-based floor coating composition layer. [Background technology]

[0002] Traditionally, concrete floors in warehouses, factories, kitchens, pharmaceutical and chemical plants, and electronic circuit factories have been coated with floor coating materials. These coating materials have included urethane resin-based floor coating compositions with excellent crack-following properties and hydraulic polymer cement compositions with excellent mechanical impact strength.

[0003] As an example of such a floor coating material, Patent Document 1 describes a prepolymer (a) having isocyanate groups at the ends, a compound (b) containing a castor oil-based polyol, and a BET specific surface area of ​​100 m². 2 A rigid urethane resin composition for floor coatings containing aluminum oxide powder (c) in amounts of 1 / g or more is disclosed.

[0004] Furthermore, in Patent Document 2, the applicant discloses a hydraulic polymer cement composition comprising a water-dispersible polyol, a polyisocyanate, an organometallic catalyst, hydraulic cement, and aggregate, wherein the water-dispersible polyol is a castor oil-based trifunctional polyol with a hydroxyl group equivalent of 250 to 600 and is present in 10 to 25 parts by weight of 100 parts by weight of the total composition; the polyisocyanate is an aliphatic isocyanurate and is present in 20 to 35 parts by weight of 100 parts by weight of the total composition; the hydraulic cement is present in 10 to 30 parts by weight of 100 parts by weight of the total composition; and the aggregate is present in 25 to 50 parts by weight of 100 parts by weight of the total composition. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2002-069291 [Patent Document 2] Japanese Patent Publication No. 2020-037508 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, the rigid urethane resin composition for floor coatings described in Patent Document 1 has the problem that it may yellow due to ultraviolet light, etc., because it lacks resistance to AGVs (Automatic Guided Vehicles), and that the coating may wear down and deteriorate. Furthermore, these issues may impair the aesthetic appearance of the floor coating material.

[0007] Furthermore, the hydraulic polymer cement composition described in Patent Document 2 may have lower crack-following properties compared to urethane resin-based floor coating compositions, and therefore may not be usable in sites where excellent crack-following properties equivalent to or better than those of urethane resin-based floor coating compositions are required.

[0008] Therefore, the problem that the present invention aims to solve is to provide a highly durable floor coating that has particularly excellent crack-following properties, resistance to yellowing and AGV (Automated Guided Vehicle) deterioration, and does not impair aesthetic appearance, as well as a method for applying the same. [Means for solving the problem]

[0010] Claim 1 The described invention applies to a base concrete surface, or to at least a primer layer and / or a base adjustment material layer further formed on the base concrete surface. A urethane resin-based floor coating composition comprising a polyol, a polyisocyanate, a diluent, a dehydrating agent, and a filler, wherein the polyisocyanate is polymethylene polyphenyl polyisocyanate, is applied to form a urethane resin-based floor coating composition layer. Furthermore, it contains a water-dispersible polyol, a polyisocyanate, an organometallic catalyst, a hydraulic cement, and aggregate, but does not contain glycerin. Hydraulic polymer cement The composition comprises a water-dispersible polyol containing water and a castor oil-based trifunctional polyol, with a hydroxyl group equivalent of 200 to 800. Hydraulic polymer cement The composition consists of 10 to 25 parts by weight per 100 parts by weight of the entire composition, with the castor oil-based trifunctional polyol comprising more than 70 parts by weight per 100 parts by weight of the water-dispersible polyol, and the polyisocyanate being an aliphatic isocyanurate. Hydraulic polymer cement The composition is 20 to 35 parts by weight per 100 parts by weight of the entire composition, and the hydraulic cement is Hydraulic polymer cement The aggregate is 10 to 30 parts by weight out of 100 parts by weight of the entire composition. Hydraulic polymer cement The present invention provides a highly durable floor coating characterized by forming a hydraulic polymer cement composition layer by applying a hydraulic polymer cement composition in an amount of 25 to 50 parts by weight per 100 parts by weight of the total composition.

[0012] Claim 2 The invention described is, On the surface of the base concrete, or on at least a primer layer and / or a base preparation material layer further formed on the surface of the base concrete, A urethane resin-based floor coating composition comprising a polyol, a polyisocyanate, a diluent, a dehydrating agent, and a filler, wherein the polyisocyanate is polymethylene polyphenyl polyisocyanate, is applied to form a urethane resin-based floor coating composition layer. Furthermore, it contains a water-dispersible polyol, a polyisocyanate, an organometallic catalyst, glycerin, a hydraulic cement, and aggregate. Hydraulic polymer cement The composition comprises a water-dispersible polyol containing water, a castor oil-based trifunctional polyol, and a tetrafunctional polyol having a bisphenol A skeleton, with a hydroxyl group equivalent of 500 to 800. Hydraulic polymer cement The total composition is 10 to 25 parts by weight, the castor oil-based trifunctional polyol is more than 30 parts by weight and 50 parts by weight or less per 100 parts by weight of the water-dispersed polyol, and glycerin is Hydraulic polymer cementIt is more than 0 parts by weight and at most 5 parts by weight in 100 parts by weight of the whole composition, and the polyisocyanate is an aliphatic isocyanurate Hydraulic polymer cement It is 20 to 35 parts by weight in 100 parts by weight of the whole composition, and the hydraulic cement is Hydraulic polymer cement It is 10 to 30 parts by weight in 100 parts by weight of the whole composition, and the aggregate is Hydraulic polymer cement Provided is a highly durable coated floor characterized in that a hydraulic polymer cement composition layer is formed by applying a hydraulic polymer cement composition which is 25 to 50 parts by weight in 100 parts by weight of the whole composition.

[0013] Claim 3 The invention according to the description is characterized in that the aliphatic isocyanurate is hexamethylene diisocyanurate Claim 1 or Claim 2 Provided is the highly durable coated floor according to the description.

[0014] Claim 4 The invention according to the description is On the surface of the base concrete, or on the surface of the base concrete further coated with at least a primer and / or a base conditioner, A urethane resin-based coated floor material composition is applied to a thickness of 0.5 to 3.0 mm, On top of that Claim 1 or Claim 2 Provided is a construction method of a highly durable coated floor characterized in that a hydraulic polymer cement composition is applied to a thickness of 1.5 to 4.0 mm for finishing.

Effect of the Invention

[0015] The highly durable coated floor of the present invention has the effect that the crack followability is particularly excellent. As shown in the following evaluation test, in the evaluation of crack followability, even when the displacement exceeds 2.0 mm, the coated floor coating film does not break. This is because a urethane resin-based coated floor material composition having excellent flexibility is used as the undercoat, and a hydraulic polymer cement composition having excellent toughness is used as the topcoat. When cracks occur in the base, the urethane resin-based coated floor material composition buffers the tensile stress generated, and it is presumed that the hydraulic polymer cement composition is tough, so that the whole coated floor is difficult to break.

[0016] In addition, since the highly durable coated floor of the present invention applies a hydraulic polymer cement composition composed of aliphatic isocyanurate polyisocyanate as the topcoat, it has the effect of having excellent yellowing resistance and will not yellow due to sunlight, ultraviolet rays, etc.

[0017] In addition, the highly durable coated floor of the present invention has the effect that the coating film is less likely to wear and deteriorate by an AGV. Further, combined with the above-mentioned yellowing resistance, the highly durable coated floor of the present invention has the effect that the aesthetic appearance at the time of construction is not impaired.

[0018] In addition, This invention The construction method of the highly durable coated floor is to apply an urethane resin-based coated floor material composition on the surface of the base concrete or on at least a primer layer and / or a base conditioner layer further formed on the surface of the base concrete, and further on this Claim 1 or Claim 2 Apply the hydraulic polymer cement described in by uniformly with a predetermined thickness.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, the present invention will be described in detail.

[0020] In the urethane resin-based coated floor material composition and the hydraulic polymer cement composition constituting the highly durable coated floor of the present invention, additives such as coloring pigments, extender pigments, dispersants, defoamers, diluents, etc. can be blended as necessary in addition to these.

[0021] First, the urethane resin-based coated floor material composition constituting the highly durable coated floor of the present invention will be described.

[0022] <Polyol> Polyols used in urethane resin-based floor coating compositions can be one or more of the following: polyester polyols, polyether polyols, polyester polyether polyols, acrylic polyols, castor oil-based polyols, fatty acid-modified polyesters, hydroxyl group-containing polyurethanes, polyacrylates, etc., in combination. Among these, the inclusion of castor oil-based polyols is preferable due to their excellent flexibility, pliability, and stretchability.

[0023] The hydroxyl group equivalent of the polyol used in the urethane resin-based floor coating composition is preferably 160 to 350. If it is less than 160, foaming may occur in the coating film, and if it is greater than 350, crack-following ability may decrease. When two or more polyols are mixed and used, the hydroxyl group equivalent of the mixture should be within this range. The amount of polyol used is also specified. Urethane resin-based floor coating The amount of the active ingredient is preferably 30 to 45 parts by weight per 100 parts by weight of the total composition. If it is less than 30 parts by weight, the crack-following ability may decrease, and if it is more than 45 parts by weight, foaming may occur in the coating film and the strength may decrease. The viscosity is preferably 2000 to 6000 mPa·s / 25℃.

[0024] <Polyisocyanate> The polyisocyanate used in the urethane resin-based floor coating composition is polymethylene polyphenyl polyisocyanate (polymeric MDI). The amount used is... Urethane resin-based floor coating Preferably, the amount is 15 to 25 parts by weight per 100 parts by weight of the entire composition. If it is less than 15 parts by weight, the crack-following ability may decrease, and if it is more than 25 parts by weight, foaming may occur in the coating film and the strength may decrease.

[0025] The NCO% of the polyisocyanate used in the urethane resin-based floor coating composition is preferably 25-35%. Below 25%, the strength of the cured product may be insufficient, and above 35%, the curing time tends to be faster, which may shorten the pot life in high-temperature environments such as summer. The viscosity is also preferably 15-150 mPa·s / 25℃. Commercially available products such as Sumijoul 44V10 (polymeric MDI, NCO%: 31%, viscosity: 130 mPa·s / 25℃, manufactured by Sumika Covestro Urethane Co., Ltd., product name) and Isocyanate J243 (polymeric MDI, NCO%: 32%, viscosity: 25 mPa·s / 25℃, manufactured by Sumika Covestro Urethane Co., Ltd., product name) can be used.

[0026] In urethane resin-based floor coating compositions, the equivalent ratio of hydroxyl groups (OH) of polyol to NCO groups of polyisocyanate (OH equivalent / NCO equivalent) is preferably 0.8 to 1.2. If it is less than 0.8, the viscosity may increase rapidly after mixing, resulting in a shorter pot life. If it is greater than 1.2, the time until tack-free formation and the rise in strength may be delayed.

[0027] <Diluent> The diluent used in urethane resin-based floor coating compositions is added to improve application workability, and can be alcohol, aromatic glycol ether, carboxylic acid ester derivative, xylene resin, etc. Among these, aromatic glycol ether is preferred, and phenoxypropanol is particularly preferred due to its good compatibility. The amount to be added is... Urethane resin-based floor coating The amount of this substance is greater than 0 parts by weight and less than or equal to 5 parts by weight per 100 parts by weight of the composition; if it exceeds 5 parts by weight, the properties of the coating film may deteriorate.

[0028] <Dehydrating agent> The dehydrating agent used in the urethane resin-based floor coating composition can be calcium oxide, molecular sieve (synthetic zeolite), silica gel, silica-magnesia gel, silica-alumina gel, activated carbon, activated alumina, etc. Among these, molecular sieve is preferred due to its excellent dehydrating properties, and molecular sieve 5A is particularly preferred. The amount to be blended is... Urethane resin-based floor coatingPreferably, the amount is 5 to 15 parts by weight per 100 parts by weight of the entire composition. If it is less than 5 parts by weight, the dehydrating effect may be insufficient and foaming may occur in the coating film, and if it is more than 15 parts by weight, the physical properties of the coating film may deteriorate.

[0029] <Filling material> The fillers used in urethane resin-based floor coating compositions can include calcium carbonate (typically heavy calcium carbonate), talc, clay, kaolin, calcium hydroxide, aluminum hydroxide, aluminum oxide, barium sulfate, barium carbonate, silica powder, silica powder, etc. Among these, aluminum hydroxide, which acts as a flame retardant, is preferred. The particle size is the average particle size D calculated by 50% weight integration. 50 The particle size is preferably 100 μm or less; if it exceeds 100 μm, unevenness may occur on the coating surface or minute protrusions may form due to the filler when applied. Urethane resin-based floor coating Preferably, the amount is 20 to 35 parts by weight per 100 parts by weight of the entire composition; if it is outside this range, the application workability may be poor.

[0030] In addition to the above, additives such as coloring pigments, extender pigments, dispersants, and defoamers may be added to the urethane-based floor coating composition.

[0031] Next, the hydraulic polymer cement composition constituting the highly durable floor coating of the present invention will be described.

[0034] <Water-dispersible polyol> The water-dispersible polyol used in the hydraulic polymer cement composition, in the hydraulic polymer cement composition described in claim 1, consists of a castor oil-based trifunctional polyol, which can be castor oil or a derivative thereof, and is a polyol with 3 hydroxyl groups. The hydroxyl group equivalent of the water-dispersible polyol used in the present invention is preferably 200 to 800. If it is less than 200, the hydraulic polymer cement composition hardens too quickly, resulting in poor workability, and if it is greater than 800, the strength of the hydraulic polymer cement composition after hardening will be insufficient. The amount of water-dispersible polyol to be blended is... Hydraulic polymer cementPreferably 10 to 25 parts by weight per 100 parts by weight of the total composition, and less than 10 parts by weight Hydraulic polymer cement The strength of the cured product of the composition decreases, and if it exceeds 25 parts by weight... Hydraulic polymer cement The workability of the composition when applied with a trowel is reduced. Also, if the castor oil-based trifunctional polyol contains more than 70 parts by weight of castor oil-based trifunctional polyol per 100 parts by weight of water-dispersed polyol, the strength after curing may be insufficient if the amount is less than 70 parts by weight.

[0037] The water-dispersible polyol used in the hydraulic polymer cement composition is as described in the claim. 2 The hydraulic polymer cement composition described herein contains water, a castor oil-based trifunctional polyol, and a tetrafunctional polyol having a bisphenol A skeleton. The castor oil-based trifunctional polyol is, as described above, castor oil and its derivatives, and is a polyol with 3 hydroxyl groups. The hydroxyl group equivalent of the castor oil-modified trifunctional polyol used in the present invention is preferably 250 to 450. If it is less than 250, the shrinkage stress of the cured product may increase, causing the coating to peel off or curing to be too fast, resulting in poor workability. If it is greater than 450, the strength of the hydraulic polymer cement composition after curing may be insufficient. Furthermore, the content of the castor oil-based trifunctional polyol in the water-dispersed polyol is preferably more than 30 parts by weight and 50 parts by weight or less per 100 parts by weight of the water-dispersed polyol. If it is 30 parts by weight or less, AGV resistance may be poor, and if it is more than 50 parts by weight, impact resistance may be insufficient.

[0038] The tetrafunctional polyol having a bisphenol A skeleton is an epoxy ring-opening polyol obtained by reacting a polyepoxy compound having a bisphenol A skeleton with an active hydrogen compound, and its hydroxyl group equivalent is preferably 250 to 450. If the hydroxyl group equivalent is less than 250, the shrinkage stress of the cured product may increase, causing the coating to peel off or curing to be too fast, resulting in poor workability. If it exceeds 450, the strength after curing may be insufficient as a hydraulic polymer cement composition. Furthermore, the content of the tetrafunctional polyol having a bisphenol A skeleton in the water-dispersed polyol is preferably more than 2 parts by weight and 15 parts by weight or less per 100 parts by weight of the water-dispersed polyol. If it is 2 parts by weight or less, impact resistance may be insufficient, and if it exceeds 15 parts by weight, AGV resistance may be insufficient.

[0039] Also, claims 2 The hydroxyl group equivalent of the water-dispersible polyol described herein is preferably 500 to 800 overall. If it is less than 500, the water-hardening polymer cement composition hardens too quickly, resulting in poor workability. If it is more than 800, the strength of the water-hardening polymer cement composition after hardening will be insufficient. The amount of water-dispersible polyol to be blended is Hydraulic polymer cement Preferably 10 to 25 parts by weight per 100 parts by weight of the total composition, and less than 10 parts by weight Hydraulic polymer cement The strength of the cured product of the composition decreases, and if it exceeds 25 parts by weight... Hydraulic polymer cement The workability of applying the composition with a trowel is reduced.

[0040] Claim 2 The invention described above addresses the reduction in AGV resistance caused by the inclusion of a polyepoxy compound having a bisphenol A skeleton by incorporating glycerin as a crosslinking agent, thereby enabling the use of the coating as an AGV-resistant floor coating. Therefore, if the polyepoxy compound having a bisphenol A skeleton is incorporated to the extent that AGV resistance is impaired, glycerin will be further incorporated, and this is the case described in the claim. 2 This constitutes the hydraulic polymer cement composition described above.

[0041] <Polyisocyanate> Claim 1 or Claim 2 The polyisocyanate used in the hydraulic polymer cement composition is an aliphatic polyisocyanate. More preferably, it is an aliphatic isocyanurate having an isocyanurate structure, and more specifically, hexamethylene diisocyanurate obtained by cyclization trimerizing 1,6-hexamethylene diisocyanate is preferred because it has excellent resistance to yellowing and improves the hardness of the coating film. To cyclize trimerize 1,6-hexamethylene diisocyanate, the method described in Japanese Patent Application Publication No. 01-33115 can be used, and the polyisocyanate used in the hydraulic polymer cement composition can be other aliphatic diisocyanates, alicyclic diisocyanates, or prepolymers thereof, and a polyisocyanate content of 99% by weight or more should be used.

[0042] Furthermore, as the polyisocyanate used in the hydraulic polymer cement composition, one with an NCO% of 15 to 25% by weight can be used, and a polyisocyanate with an NCO% of 20 to 25% by weight is more preferable. If the NCO% is less than 15%, the strength of the coating film may be insufficient, and if it exceeds 25% by weight, the amount of polyisocyanate with an isocyanurate structure decreases, and conversely, the amount of polyisocyanate that is not trimerized, such as diisocyanate, increases, similarly resulting in insufficient strength of the coating film.

[0043] Furthermore, the viscosity of the polyisocyanate used in the hydraulic polymer cement composition is preferably 500 to 3500 mPa·s / 25℃. If it is less than 500 mPa·s, the strength of the coating film may be insufficient, and if it is greater than 3500 mPa·s, the workability when applying it to the substrate concrete surface may decrease.

[0044] Furthermore, the amount of polyisocyanate used in the hydraulic polymer cement composition is 20 to 35 parts by weight per 100 parts by weight of the total composition. If the amount is less than 20 parts by weight, the strength of the coating film may be insufficient, and if it exceeds 35 parts by weight, the curing time will be shortened, which may result in poor workability.

[0045] In a hydraulic polymer cement composition, the equivalent ratio of hydroxyl groups (OH) of the water-dispersed polyol to the NCO groups of the polyisocyanate (OH equivalent / NCO equivalent) is preferably 2.0 to 6.0, and more preferably 3.5 to 5.5. If the ratio is less than 2.0, the viscosity may increase rapidly after mixing, resulting in a shorter pot life. If the ratio is greater than 6.0, the time until tack-free formation and the rise in strength may be delayed.

[0046] <Organometallic catalyst> The organometallic catalyst used in the hydraulic polymer cement composition is added to accelerate the hardening of the composition. For example, organometallic catalysts such as tin octoate, tin oleate, tin laurate, dibutyltin diacetate, dibutyltin diacetylacetonate, dibutyltin dilaurate, dibutyltin dichloride, lead octoate, lead naphthenate, and bismuth octoate can be used. Among these hardening catalysts, organotin compounds are preferred. Furthermore, among these hardening catalysts, dibutyltin diacetylacetonate, dibutyltin diacetate, dibutyltin dilaurate, and dibutyltin dichloride are more preferred from the viewpoint of catalytic effect. The amount of organometallic catalyst added is preferably 0.001 to 0.01 parts by weight per 100 parts by weight of the total composition. If it is less than 0.001 parts by weight, the strength of the coating film may be insufficient, and if it is more than 0.01 parts by weight, hardening will be too fast, which may result in poor application workability with a trowel, etc.

[0047] <Hydrosetting cement> The hydraulic cement used in the hydraulic polymer cement composition is preferably primarily white Portland cement to impart a specific color tone, but other types such as ordinary Portland cement, alumina cement, blast furnace cement, and rapid-hardening Portland cement can also be used in combination. The amount of hydraulic cement is preferably 10 to 30 parts by weight per 100 parts by weight of the total composition. If the amount is less than 10 parts by weight, the strength of the coating film decreases, and if it exceeds 30 parts by weight, the workability of applying the composition to the substrate concrete surface with a trowel or the like decreases.

[0048] <Aggregates> Aggregates used in hydraulic polymer cement compositions can include silica sand, calcium carbonate, aluminum hydroxide, etc., with a particle size of 0.05 to 0.7 mm. If the particle size is less than 0.05 mm, the viscosity of the composition will be high, which may reduce the workability of application. If the particle size is greater than 0.7 mm, the surface smoothness of the coating film may be poor when applied on a urethane resin-based floor coating composition layer.

[0049] The amount of aggregate in the composition should be 25 to 50 parts by weight per 100 parts by weight of the total composition. If the amount is less than 25 parts by weight, impact resistance may be poor, and if it exceeds 50 parts by weight, surface smoothness may decrease.

[0050] In addition to the above, additives such as coloring pigments, extender pigments, dispersants, defoamers, and diluents may be added to the hydraulic polymer cement composition.

[0051] The urethane resin-based floor coating composition and the hydraulic polymer cement composition constituting the highly durable floor coating of the present invention can be applied using a trowel, roller brush, or the like. It is desirable to first apply the urethane resin-based floor coating composition as a base coat to a thickness of 0.5 to 3.0 mm, and then apply the hydraulic polymer cement composition as a top coat to a thickness of 1.5 to 4.0 mm to finish the coating. By applying the coatings in this manner, pinholes will not occur in the hardened top coat film, resulting in a floor coating with excellent aesthetics.

[0052] Examples of primers that can be used in conjunction with the highly durable floor coating of the present invention include JJ-100 (water-based urethane primer, manufactured by Aica Kogyo Co., Ltd., product name), and examples of substrate preparation materials include JEX-210 (water-based polymer cement mortar resin, manufactured by Aica Kogyo Co., Ltd., product name).

[0053] The following will provide a detailed explanation using examples and comparative examples. [Examples]

[0054] <Urethane resin-based floor coating composition> As polyol A, a castor oil-based trifunctional polyester polyol (hydroxyl group equivalent: 340) was used; as polyol B, a castor oil-based trifunctional polyester polyol (hydroxyl group equivalent: 230); and as polyol C, an aliphatic trifunctional polyester polyether polyol (hydroxyl group equivalent: 182) was used. As polyisocyanate A, Sumijool 44V10 was used; as polyisocyanate B, isocyanate J243 was used; as a diluent, phenoxypropanol (manufactured by Yokkaichi Gosei Co., Ltd.) was used; and as a dehydrating agent, molecular sieve 5Å powder (average particle size D 50 :10μm or less, manufactured by Union Showa Co., Ltd., product name) is used, and aluminum hydroxide B-308 (average particle size D) is used as a filler. 50 Using a 10.5 μm (product name: Almorix Co., Ltd.), along with a defoamer and dispersant commonly used in urethane resins, urethane resin-based floor coating compositions I and II were prepared according to the formulations shown in Table 1.

[0055] [Table 1]

[0056] <Hydrosetting polymer cement composition> As the water-dispersible polyol, water-dispersible polyol C is used, which consists of a castor oil-based trifunctional polyol with a hydroxyl equivalent of 280-560 (water content: 25-30% by weight), a castor oil-based difunctional polyol containing 14-20 parts by weight of castor oil-based difunctional polyol per 100 parts by weight of castor oil-based trifunctional polyol, with a total hydroxyl equivalent of 200-500 (water content: 25-30% by weight), a castor oil-modified trifunctional polyol with a hydroxyl equivalent of 350, a tetrafunctional polyol having a bisphenol A skeleton with a hydroxyl equivalent of 360, 20-25 parts by weight of mezamol (sulfonic acid ester compound, manufactured by Bayer, trade name) as a diluent, and 30 parts by weight of water (ion-exchanged water), totaling 100 parts by weight, with a hydroxyl equivalent of 500-800. Polyisocyanate C, which is hexamethylene diisocyanurate (viscosity 2500 mPa·s / 25℃, NCO%: 20 wt%, polyisocyanate content 99 wt% or more), and polyisocyanate D, which is 4,4'-diphenylmethane diisocyanate (NCO wt%: 31.0 wt%), were used as sociocyanates. Neostan U220H (dibutyltin diacetylacetonate) was used as an organometallic catalyst. Tohoku Silica Sand No. 6 (manufactured by Tohoku Silica Sand Co., Ltd., trade name) with a particle size of 0.05 to 0.6 mm was used as aggregate. White Portland cement (manufactured by Taiheiyo Cement Corporation) was used as the hydraulic cement. In addition, glycerin, an antifoaming agent, and a dispersant commonly used in hydraulic polymer cement compositions were used to prepare hydraulic polymer cement compositions A to E according to the formulations shown in Table 2.

[0057] [Table 2]

[0058] <Examples and Comparative Examples> Using the above-mentioned urea resin-based floor coating compositions I and II, and hydraulic polymer cement compositions A to E, highly durable floor coatings with the application thicknesses shown in Tables 3 and 4 were prepared, and these were designated as Examples 1 to 5 and Comparative Examples 1 to 5.

[0059] [Table 3]

[0060] [Table 4]

[0061] <Evaluation Method> The above examples and comparative examples were evaluated as follows. Unless otherwise specified, the preparation, curing, and evaluation tests of the test specimens were carried out under conditions of 23°C and 50% RH.

[0062] <Crack-following ability> Flexible boards (100 x 70 mm, 8 mm thick) conforming to JIS A 5430 were used as the base layer. Two 70 x 8 mm end grain pieces of this base layer were butted together, and the back surfaces were temporarily secured with masking tape. JJ-100 (Aica Kogyo Co., Ltd., product name) was applied to the surface of the base layer as a primer at a rate of 0.5 kg / m². 2 After application and drying, the undercoat for the examples and comparative examples was applied to the thicknesses indicated in Tables 3 and 4, and cured for 18 hours. Subsequently, the topcoat for the examples and comparative examples was applied to the thicknesses indicated in Tables 3 and 4, and cured for 14 days to prepare the test specimens. The temporary fixing tape on the back of the test specimens was removed, and both ends of the test specimens were pulled at 2 mm / min using a universal testing machine (Instron). The distance at which a pinhole occurred in the coating film at the abutment point was evaluated as follows: ◎ if 2.0 mm or more, ○ if between 1.5 mm and less than 2.0 mm, △ if between 1.0 mm and less than 1.5 mm, and × if less than 1.0 mm.

[0063] <AGV resistance> Apply JJ-100 (Aica Kogyo Co., Ltd., product name) as a primer to the surface of a dry concrete slab measuring 300mm x 300mm and 60mm thick, conforming to JIS A 5371 (moisture content of 5% or less as measured by a Kett HI-520 concrete range), at a rate of 0.5kg / m². 2Apply it, and after drying, apply the undercoats of the examples and comparative examples to the coating thicknesses described in Tables 3 and 4, cure for 18 hours, and then apply the topcoats of the examples and comparative examples to the coating thicknesses described in Tables 3 and 4, cure for 14 days to obtain test specimens. Place the test specimens in a reciprocating testing machine (urethane tire, load: 600 kg, speed: 12.5 times / min, reciprocating angle: 90°), and reciprocate 10,000 times. After the test, observe the coating film, and evaluate those without any abnormalities such as significant wear damage or chipping on the coating film as ○, and those with abnormalities as ×.

[0064] <Yellowing resistance> Apply JJ-100 (product name, manufactured by Aika Kogyo Co., Ltd.) as a primer to the mortar (70×70×20 mm) specified in JIS R 5201 at an application rate of 0.5 kg / m 2 Apply it, and after drying, apply the undercoats of the examples and comparative examples to the coating thicknesses described in Tables 3 and 4, cure for 18 hours, and then apply the topcoats of the examples and comparative examples to the coating thicknesses described in Tables 3 and 4, cure for 14 days to obtain test specimens. Irradiate each test specimen with a black light (sterilization lamp, peak wavelength 256 nm, 31 μW / cm 2 ) from a height of 50 cm for 200 hours, and measure the color difference (ΔE) before and after irradiation with a color difference meter for colors (CM-2600d, manufactured by Konica Minolta Sensing Inc.). Evaluate those with ΔE of 1.0 or less as ○, and those with ΔE exceeding 1.0 as ×.

[0065] <Adhesion> Prepare test specimens similar to the above-mentioned AGV resistance test specimens. Use a Kenji adhesion tester to measure the adhesion strength (N / mm 2 ) between the 40×40 mm part of the test specimen and the concrete slab. Evaluate those with an adhesion strength of 2.0 N / mm 2 or more as having sufficient adhesion strength. Also, evaluate those with a failure state of 100% cohesive failure of the base concrete as ○, and those otherwise as ×.

[0066] <Impact resistance> A test specimen similar to the one described above for AGV resistance was prepared. A 1kg steel ball was dropped 60 times from a height of 1m onto the center of the test specimen. Specimens without cracks, peeling, or other abnormalities in the coating were rated as ○, and those with abnormalities were rated as ×.

[0067] <Resistance to repeated temperature changes> A test specimen similar to the one used for the AGV resistance test was prepared. This test specimen was subjected to 100 cycles of repeated hot and cold cycles of [-5°C for 3 hours] → [40°C for 1 hour]. A circle (○) was used to indicate that no abnormalities such as peeling or blistering occurred in the coating due to the difference in shrinkage rates between the floor coating and the concrete caused by the temperature change, while a cross (×) was used to indicate that abnormalities occurred.

[0068] <Hardness> A test specimen similar to the one described above for AGV resistance was prepared. Type D durometer hardness (HDA) was measured in accordance with JIS K 7215.

[0069] <Finished product> Test specimens similar to those used for the AGV resistance test were prepared. The coating surface was observed, and specimens with 5 or fewer bubbles or pinholes were rated as ○, while those with more than 5 were rated as ×.

[0070] <Evaluation Results> The evaluation results are shown in Tables 5 and 6.

[0071] [Table 5]

[0072] [Table 6]

Claims

1. On the surface of the base concrete, or on the primer layer and / or base preparation material layer further formed on the surface of the base concrete, A urethane resin-based floor coating composition comprising a polyol, a polyisocyanate, a diluent, a dehydrating agent, and a filler, wherein the polyisocyanate is polymethylene polyphenyl polyisocyanate, is applied to form a urethane resin-based floor coating composition layer. A highly durable floor coating is characterized by applying a hydraulic polymer cement composition to form a hydraulic polymer cement composition layer, wherein the hydraulic polymer cement composition comprises a water-dispersible polyol, a polyisocyanate, an organometallic catalyst, hydraulic cement, and aggregate, and does not contain glycerin, the water-dispersible polyol comprises water and a castor oil-based trifunctional polyol with a hydroxyl group equivalent of 200 to 800 and is present in 10 to 25 parts by weight per 100 parts by weight of the entire hydraulic polymer cement composition, the castor oil-based trifunctional polyol is present in more than 70 parts by weight per 100 parts by weight of the water-dispersible polyol, the polyisocyanate is an aliphatic isocyanurate and is present in 20 to 35 parts by weight per 100 parts by weight of the entire hydraulic polymer cement composition, the hydraulic cement is present in 10 to 30 parts by weight per 100 parts by weight of the entire hydraulic polymer cement composition, and the aggregate is present in 25 to 50 parts by weight per 100 parts by weight of the entire hydraulic polymer cement composition.

2. On the surface of the base concrete, or on the primer layer and / or base preparation material layer further formed on the surface of the base concrete, A urethane resin-based floor coating composition comprising a polyol, a polyisocyanate, a diluent, a dehydrating agent, and a filler, wherein the polyisocyanate is polymethylene polyphenyl polyisocyanate, is applied to form a urethane resin-based floor coating composition layer. Furthermore, the hydraulic polymer cement composition comprises a water-dispersible polyol, a polyisocyanate, an organometallic catalyst, glycerin, hydraulic cement, and aggregate, wherein the water-dispersible polyol comprises water, a castor oil-based trifunctional polyol, and a tetrafunctional polyol having a bisphenol A skeleton, with a hydroxyl group equivalent of 500 to 800 and being 10 to 25 parts by weight per 100 parts by weight of the entire hydraulic polymer cement composition, the castor oil-based trifunctional polyol is more than 30 parts by weight and 50 parts by weight or less per 100 parts by weight of the water-dispersible polyol, and the glycerin is A highly durable floor coating characterized by forming a hydraulic polymer cement composition layer by applying a hydraulic polymer cement composition, wherein the hydraulic polymer cement composition comprises more than 0 parts by weight and 5 parts by weight or less per 100 parts by weight of the total hydraulic polymer cement composition, the polyisocyanate is an aliphatic isocyanurate and comprises 20 to 35 parts by weight per 100 parts by weight of the total hydraulic polymer cement composition, the hydraulic cement comprises 10 to 30 parts by weight per 100 parts by weight of the total hydraulic polymer cement composition, and the aggregate comprises 25 to 50 parts by weight per 100 parts by weight of the total hydraulic polymer cement composition.

3. The highly durable floor coating according to claim 1 or 2, characterized in that the aliphatic isocyanurate is hexamethylene diisocyanurate.

4. On the surface of the base concrete, or on the surface of the base concrete after applying at least a primer and / or a surface preparation material, A urethane resin-based floor coating composition is applied to a thickness of 0.5 to 3.0 mm. A method for constructing a highly durable floor coating, characterized by applying the hydraulic polymer cement composition described in claim 1 or claim 2 to a thickness of 1.5 to 4.0 mm on top of the surface.

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