Conductive aqueous coating floor material composition, construction method of conductive coating floor, and conductive coating floor

Abstract

To provide a conductive aqueous coating floor material composition, a construction method of a conductive coating floor, and a conductive coating floor which serve as three steps of a non-conductive primer, an uneven correction material, and a conductive primer in one step, enable formation of a conductive coating floor in a saved step due to excellent adhesion to a top coating material, and make the conductive coating floor excellent in impact resistance.SOLUTION: A conductive aqueous coating floor material composition contains an epoxy resin, amine, a carbon nanotube, a hydraulic cement, a filler, an aggregate, and water, in which the epoxy resin is a bisphenol F type epoxy resin, the amine is modified aliphatic polyamine, 0.0030 to 0.0065 pts.wt. of the carbon nanotube is contained in 100 pts.wt. of the whole composition, and 25 to 55 pts.wt. of the aggregate is contained in 100 pts.wt. of the whole composition.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a conductive water-based coated floor material composition that can omit the step of applying a conductive coated floor, a method for applying a conductive coated floor, and a conductive coated floor. [Background technology]

[0002] Previously, the present applicant has disclosed in Patent Document 1 a water-based conductive primer composition for conductive floors, which is characterized by comprising at least an epoxy resin, an epoxy resin curing agent, and artificial graphite.

[0003] In addition, Patent Document 2 discloses a method for applying a conductive primer layer formed on the surface of a floor foundation concrete, and a conductive water-based polymer cement composition applied on the conductive primer layer in an amount of 2.5 to 4.5 kg / m. 2 and a conductive water-based polymer cement composition layer formed by applying a conductive water-based polymer cement composition comprising a water-dispersible polyol, a polyisocyanate, an organometallic catalyst, carbon fiber, hydraulic cement, and an aggregate, the water-dispersible polyol containing water and at least a castor oil-based trifunctional polyol and having a hydroxyl group equivalent of 200 to 800, the water-dispersible polyol being 10 to 30 parts by weight in 100 parts by weight of the conductive water-based polymer cement composition, and the polyisocyanate being an aliphatic isocyanurate. The conductive coated floor structure is characterized in that it is composed of a polyisocyanate of 20 to 40 parts by weight in 100 parts by weight of the conductive water-based polymer cement composition, the carbon fibers are 0.01 to 2.5 mm in length and 5 to 20 μm in diameter and the carbon fibers are 0.05 to 0.2 parts by weight in 100 parts by weight of the conductive water-based polymer cement composition, the hydraulic cement is 10 to 20 parts by weight in 100 parts by weight of the conductive water-based polymer cement composition, and the aggregate is 20 to 40 parts by weight in 100 parts by weight of the conductive water-based polymer cement composition. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-262254 [Patent Document 2] Japanese Patent Publication No. 2022-130882 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the water-based conductive primer composition described in Patent Document 1 has the problem that it may not provide conductivity or may result in a poor finish in areas with significant unevenness in the subfloor concrete. To solve this problem, an unevenness correction material can be applied between the subfloor concrete and the water-based conductive primer, or a conductive unevenness correction material can be applied on top of the conductive primer, but this increases the number of steps, which can be time-consuming and labor-intensive. Another problem is that the conductive primer layer formed by the water-based conductive primer has insufficient impact resistance and may cause interlayer delamination. Another problem with the water-based conductive primer is that unless the surface is roughened by polishing after curing, the adhesion of the material applied on top (topcoat) may be insufficient.

[0006] Furthermore, the conductive coated floor structure described in Patent Document 2 has the problem that the impact resistance of the entire coated floor may be insufficient if the conductive primer layer is formed with the water-based conductive primer described in Patent Document 1. To solve this problem, a non-conductive coated floor can be applied to the surface of the floor base concrete, and the conductive primer layer can then be formed on top of that, but this increases the number of steps, which can be time-consuming and labor-intensive.

[0007] The problem that the present invention aims to solve is to provide a conductive water-based coated floor material composition, a method for applying a conductive coated floor, and a conductive coated floor that can perform the three steps of applying a non-conductive primer, an unevenness correcting material, and a conductive primer in one step, has excellent adhesion to the top coat, and therefore can form a conductive coated floor with fewer steps, and further has excellent impact resistance. [Means for solving the problem]

[0008] In order to solve the above problem, the invention of claim 1 provides a composition comprising an epoxy resin, an amine, carbon nanotubes, hydraulic cement, a filler, an aggregate, and water, The epoxy resin is a bisphenol F type epoxy resin. The amine is a modified aliphatic polyamine, The carbon nanotubes are present in an amount of 0.0030 to 0.0065 parts by weight based on 100 parts by weight of the total composition, The aggregate is 25 to 55 parts by weight per 100 parts by weight of the total composition. Provided is a conductive water-based floor coating composition.

[0009] The invention described in claim 2 is characterized in that the hydraulic cement is 10 to 30 parts by weight based on 100 parts by weight of the total composition, The amount of water is 10 to 30 parts by weight per 100 parts by weight of hydraulic cement. The present invention provides the conductive water-based floor coating composition according to claim 1.

[0010] The invention described in claim 3 is applied to a concrete floor base or an existing painted floor base, The conductive water-based floor coating composition according to claim 1 or 2 is applied in an amount of 0.7 to 2.0 kg / m 2 to form a conductive water-based floor coating composition layer, A conductive floor coating composition is applied thereon to form a conductive floor coating composition layer. A method for installing a conductive painted floor is provided.

[0011] The invention of claim 4 provides a conductive floor coating composition, which is a conductive water-based polymer cement composition containing a water-dispersible polyol, a polyisocyanate, an organometallic catalyst, carbon fiber, hydraulic cement, and an aggregate, the water-dispersible polyol contains water, a castor oil-based trifunctional polyol, and a tetrafunctional polyol having a bisphenol A skeleton, has a hydroxyl equivalent of 500 to 800, and is contained in an amount of 10 to 30 parts by weight per 100 parts by weight of the entire composition, and the castor oil-based trifunctional polyol is contained in an amount of more than 30 parts by weight and not more than 50 parts by weight per 100 parts by weight of the water-dispersible polyol; The polyisocyanate contains an aliphatic isocyanurate and is present in an amount of 20 to 40 parts by weight per 100 parts by weight of the total composition; The carbon fiber has a length of 0.01 to 2.5 mm and a diameter of 5 to 20 μm, and is contained in an amount of 0.05 to 0.2 parts by weight per 100 parts by weight of the total composition; The hydraulic cement is 10 to 20 parts by weight based on 100 parts by weight of the total composition, The aggregate is 20 to 50 parts by weight per 100 parts by weight of the total composition. The present invention provides a method for constructing a conductive coated floor according to claim 3.

[0012] The invention as set forth in claim 5 provides a conductive coated floor formed by the conductive coated floor construction method as set forth in claim 3.

[0013] The invention as set forth in claim 6 provides a conductive coated floor formed by the conductive coated floor construction method as set forth in claim 4. [Effects of the Invention]

[0014] The conductive waterborne floor coating composition of the present invention has the advantage that it can perform the three steps of applying a non-conductive primer, an unevenness corrector, and a conductive primer in a single step. Furthermore, the resulting coating film has sufficient adhesion to the top coat without the need for surface polishing. This has the effect of shortening the construction process for a conductive coated floor. Furthermore, it has the effect of making the conductive coated floor highly impact resistant.

[0015] Furthermore, the method for constructing a conductive coated floor of the present invention uses the conductive water-based floor coating composition as a non-conductive primer, an unevenness corrector, and a conductive primer, and does not require polishing, which has the effect of reducing the number of steps required to form a conductive coated floor.Furthermore, it has the effect of forming a conductive coated floor with excellent impact resistance. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present invention will be described in detail below.

[0017] First, the conductive waterborne floor coating composition of the present invention will be described.

[0018] The conductive waterborne floor coating composition of the present invention comprises an epoxy resin, an amine, carbon nanotubes, hydraulic cement, a filler, an aggregate, and water, wherein the epoxy resin is a bisphenol F type epoxy resin, the amine is a modified aliphatic polyamine, the carbon nanotubes are 0.0030 to 0.0065 parts by weight per 100 parts by weight of the total composition, and the aggregate is 25 to 55 parts by weight per 100 parts by weight of the total composition, and further additives such as color pigments, extender pigments, dispersants, and antifoaming agents can be blended in addition to these ingredients as needed.

[0019] <Epoxy resin> The epoxy resin constituting the conductive waterborne floor coating composition of the present invention may be liquid and cure at room temperature. In particular, bisphenol F type epoxy resins and their adducts, hydrogenated modified products, etc., can be used, and these may be used alone or in combination. From the viewpoint of workability, hydrogenated products are preferred. Even if these are solid at room temperature, they can be used as long as they become liquid by mixing with a diluent, as described below.

[0020] The epoxy equivalent is preferably 120 to 220, and sufficient coating film strength can be obtained within this range. The amount of epoxy resin blended is preferably 10 to 30 parts by weight per 100 parts by weight of the total composition; if it is less than 10 parts by weight, the coating film strength may be insufficient, and if it exceeds 30 parts by weight, workability may be reduced. Commercially available epoxy resins include NPEF-170 (bisphenol F type epoxy resin, epoxy equivalent: 170, manufactured by Nan-A Plastics Co., Ltd., trade name) and EP-4901 (bisphenol F type epoxy resin, epoxy equivalent: 170, manufactured by ADEKA Corporation, trade name).

[0021] <amine> The amines constituting the conductive waterborne floor coating composition of the present invention may be any amine as long as they are soluble in water, with modified aliphatic polyamines being particularly preferred. Aliphatic polyamines are aliphatic compounds containing at least two amino and two imino groups per molecule, such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, diethylaminopropylamine, hexamethylenediamine, trimethylhexamethylenediamine, polyoxypropylenediamine, and iminobishexylamine. Modified aliphatic polyamines are those derived from these compounds. Examples of such modifications include self-emulsifying compounds in which a hydrophilic backbone such as polyether is introduced into an epoxy resin and reacted with an excess of amine, ethylene oxide adducts, epoxy resin adducts, monoglycidyl ether adducts, acrylonitrile adducts, styrene adducts, phenol-formalin modified products (Mannich modified products), thiourea reaction products, and fatty acid glycidyl ether adducts. In the present invention, styrene adducts and Mannich-modified products are preferred because they have excellent physical properties such as AGV (Automated Guided Vehicle) resistance (durability of AGV tires when turned stationary) and impact resistance, and also have excellent low-temperature curing properties.

[0022] The amount of amine blended is preferably 5 to 15 parts by weight per 100 parts by weight of the total composition; if it is less than 5 parts by weight, impact resistance may be insufficient, and if it exceeds 15 parts by weight, the usable time may be shortened. The active hydrogen equivalent is preferably 50 to 150; if it is less than 50, the usable time may be shortened, and if it exceeds 150, impact resistance may be insufficient. Commercially available amines include Daitoclar X-7028 (styrene adduct of aliphatic polyamine, active hydrogen equivalent: 90, product name, manufactured by Daito Sangyo Co., Ltd.), Daitoclar X-7027 (styrene adduct of aliphatic polyamine, active hydrogen equivalent: 90, product name, manufactured by Daito Sangyo Co., Ltd.), and Adeka Hardener EH-451N (Mannich-modified aliphatic polyamine, active hydrogen equivalent: 78, product name, manufactured by ADEKA Corporation).

[0023] In the conductive waterborne coating floor material composition of the present invention, the resin solids weight of the epoxy resin and amine relative to the weight of the total formulation including water is preferably 20 to 45%. If it is less than 20%, impact resistance may be insufficient, and if it exceeds 45%, the viscosity of the entire composition may become high, which may reduce the workability during application.

[0024] The equivalent ratio of the active hydrogen equivalent of the amine to the epoxy equivalent of the epoxy resin is preferably 0.7 to 1.3. If it is less than 0.7, the strength of the cured product, for example, compressive strength, may be insufficient, and if it exceeds 1.3, the excess amine may result in a poor finish on the coating surface.

[0025] <Carbon nanotubes> The carbon nanotubes constituting the conductive waterborne floor coating composition of the present invention are not particularly limited, and carbon nanotubes produced by methods such as arc discharge, laser evaporation, and chemical vapor deposition (CVD) can be used. Single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, and mixtures thereof can all be used. Carbon nanotubes have the appearance of cylindrical honeycomb-structured sheets in which carbon atoms are connected in a hexagonal planar pattern. It is known that defects in the honeycomb structure reduce the effects of carbon nanotubes. Furthermore, since single-walled carbon nanotubes have fewer defects in the honeycomb structure than multi-walled carbon nanotubes, it is preferable that the conductive waterborne floor coating composition of the present invention contain at least single-walled carbon nanotubes from the perspective of obtaining stable conductivity.

[0026] The length of the carbon nanotubes is preferably 1 to 2000 μm, more preferably 50 to 2000 μm, and even more preferably 200 to 2000 μm. When the length of the carbon nanotubes is within this range, sufficient conductivity and coating film surface smoothness can be obtained. Furthermore, the outer diameter of the carbon nanotubes is preferably 0.5 to 20 nm, more preferably 0.5 to 10 nm. When the outer diameter of the carbon nanotubes is within this range, sufficient conductivity and coating film surface smoothness can be obtained. The amount of carbon nanotubes to be blended is preferably 0.0030 to 0.0065 parts by weight per 100 parts by weight of the total composition. If the amount is less than 0.0030 parts by weight, the conductivity may be insufficient, and if the amount is more than 0.0065 parts by weight, the surface smoothness may be poor, which may adversely affect the surface smoothness of a floor coating material applied on the conductive water-based floor coating material composition.

[0027] <Hydraulic cement> The hydraulic cement constituting the conductive waterborne floor coating composition of the present invention is preferably primarily white Portland cement so that a specific color tone can be imparted, but ordinary Portland cement, alumina cement, blast furnace cement, high-early-strength Portland cement, etc. can also be used in combination. The blending amount is preferably 10 to 30 parts by weight per 100 parts by weight of the total composition; if it is less than 10 parts by weight, the strength of the coating film may decrease, and if it exceeds 30 parts by weight, the application workability may decrease.

[0028] Water is also blended to improve the hardening of the hydraulic cement and the workability of the composition. The amount of water blended is preferably 1 to 9 parts by weight per 100 parts by weight of the total composition, and more preferably 10 to 30 parts by weight per 100 parts by weight of hydraulic cement.

[0029] In the conductive waterborne floor coating composition of the present invention, the weight ratio of water to hydraulic cement (water / hydraulic component, commonly referred to as W / C) is preferably 0.1 to 0.4, as this results in a strong coating film. If the weight ratio of hydraulic cement to water (water / hydraulic component) is less than 0.1, impact resistance may decrease, and if it exceeds 0.4, self-leveling properties may decrease, resulting in an unsmooth coating surface.

[0030] <Filling material> The filler constituting the conductive water-based floor coating composition of the present invention has an average particle size D 50 The term "filler" refers to a filler with a particle size of less than 50 μm (50% cumulative particle size by weight), and is blended to adjust the viscosity of the composition and ease of application. Heavy calcium carbonate, clay, kaolin, talc, precipitated barium sulfate, barium carbonate, silica sand powder, etc. can be used, with heavy calcium carbonate being inexpensive and reducing the cost burden. The amount of filler blended is preferably 2 to 10 parts by weight per 100 parts by weight of the total composition. If it is less than 2 parts by weight, the cost may be high, and if it exceeds 10 parts by weight, the workability may decrease. Examples of commercially available filler products include Super S (average particle size D 50 : 6.3 μm, product name, manufactured by Maruo Calcium Co., Ltd.

[0031] <Aggregate> The aggregate used in the present invention may be silica sand, calcium carbonate, aluminum hydroxide, etc. 50 The particle size (50% cumulative particle size by weight) is preferably 0.05 to 0.70 mm, and within this range, excellent application workability and surface smoothness are achieved. The blending amount is preferably 25 to 55 parts by weight per 100 parts by weight of the total composition; if it is less than 25 parts by weight, the pinhole prevention effect may be poor, and if it exceeds 55 parts by weight, impact resistance and workability may decrease. Furthermore, 30 to 50 parts by weight is more preferable, and 35 to 45 parts by weight is even more preferable. Examples of commercially available aggregates include Sarawak silica sand (average particle size D 50 : 150 μm, Tochu Co., Ltd., product name) and Mikawa silica sand R556 (average particle size D 50 : 200 μm, product name, manufactured by Mikawa Silica Co., Ltd.)

[0032] In addition to the above, the conductive waterborne floor coating composition of the present invention may contain coloring pigments, extender pigments, dispersants, antifoaming agents, diluents, AE water-reducing agents, hardening accelerators, and the like.

[0033] The diluent may be either a reactive or non-reactive diluent, and any diluent that provides good workability can be used. Glycidyl ethers that react with the above-mentioned amines can be used as reactive diluents. Non-reactive diluents are not reactive with the above-mentioned epoxy resins or amines. Benzyl alcohol, nicanol, etc. can be used as non-reactive diluents. It is preferable to use a reactive diluent when it is necessary to avoid the generation of VOCs (volatile organic compounds). Furthermore, the amount of diluent blended is preferably 5 parts by weight or less per 100 parts by weight of the total composition; if it exceeds 5 parts by weight, impact resistance may be insufficient.

[0034] Air-entraining water reducers can be anionic, nonionic, cationic, or amphoteric air-entraining agents, as well as lignin sulfonate-based, sulfonate-based, higher polyhydric alcohol-based, oxyorganic acid, alkylaryl sulfonate, polyoxyethylene alkyl ether-based, polycarboxylic acid-based, or polyol complex-based water reducers, or combinations or mixtures of these. However, the most effective are modified polycarboxylic acid-based or polyether-polycarboxylic acid-based high-performance air-entraining water reducers. An example of a commercially available modified polycarboxylic acid-based air-entraining water reducer is Melflux AP101F (manufactured by Degussa Construction Co., Ltd.), and an example of a commercially available polyether-polycarboxylic acid-based high-performance air-entraining water reducer is Melflux 2641F (manufactured by Degussa Construction Co., Ltd.). Adding 0.1 to 1 part by weight of these air-entraining water reducers to 100 parts of hydraulic cement lowers the viscosity of the composition and reduces the TI value.

[0035] Furthermore, a curing accelerator can be added to accelerate the reaction between the epoxy resin and the non-aqueous epoxy resin curing agent. For example, a tertiary amine such as 2,4,6-tris(dimethylaminomethyl)phenol, or an alkylphenol such as phenol, cresol, nonylphenol, styrenated phenol, or p-tert-butylphenol can be used.

[0036] The viscosity of the conductive waterborne floor coating composition of the present invention is preferably 7 to 15 Pa·s, and within this range, pinholes do not form on the coating surface and unevenness can be easily corrected. The viscosity is measured using a BM-type viscometer (manufactured by Toki Sangyo Co., Ltd.) with a rotor No. 4 at a rotation speed of 30 rpm.

[0037] Next, the conductive coated floor material composition used in the method for constructing a conductive coated floor of the present invention will be described.

[0038] A conductive floor coating composition is a floor coating composition in which a conductive material is blended with a non-conductive floor coating composition to impart conductivity. Examples of such non-conductive floor coating compositions include those primarily composed of epoxy resin, urethane resin, vinyl ester resin, or aqueous versions of these. Examples of such conductive materials include carbon or metal chips, fillers, and fibers. Various conductive materials can be used as the conductive floor coating composition, but the following conductive aqueous polymer cement composition can also be used.

[0039] The conductive waterborne polymer cement composition includes a water-dispersible polyol, a polyisocyanate, an organometallic catalyst, carbon fiber, hydraulic cement, and an aggregate. The water-dispersible polyol includes water, a castor oil-based trifunctional polyol, and a tetrafunctional polyol having a bisphenol A skeleton. The hydroxyl equivalent is 500 to 800 and the amount is 10 to 30 parts by weight per 100 parts by weight of the entire composition. The castor oil-based trifunctional polyol is more than 30 parts by weight and not more than 50 parts by weight per 100 parts by weight of the water-dispersible polyol. The polyisocyanate is a fatty acid. The conductive waterborne polymer cement composition contains an aliphatic isocyanurate in an amount of 20 to 40 parts by weight per 100 parts by weight of the total composition; carbon fibers having a length of 0.01 to 2.5 mm and a diameter of 5 to 20 μm in an amount of 0.05 to 0.2 parts by weight per 100 parts by weight of the total composition; hydraulic cement in an amount of 10 to 20 parts by weight per 100 parts by weight of the total composition; and aggregate in an amount of 20 to 40 parts by weight per 100 parts by weight of the total composition; and, if necessary, additives such as color pigments, extender pigments, dispersants, antifoaming agents, and diluents can be blended in addition to these.

[0040] <Water-dispersible polyol> The water-dispersible polyol constituting the conductive waterborne polymer cement composition contains water, a castor oil-based trifunctional polyol, and a tetrafunctional polyol having a bisphenol A skeleton. The hydroxyl equivalent of the entire water-dispersible polyol is preferably 500 to 800. If it is less than 500, the hydraulic polymer cement composition may harden too quickly, resulting in poor workability. If it exceeds 800, the hydraulic polymer cement composition may have insufficient strength after hardening. The amount of water-dispersible polyol blended is preferably 10 to 30 parts by weight per 100 parts by weight of the total composition. If it is less than 10 parts by weight, the strength of the cured product of the composition may decrease, and if it exceeds 30 parts by weight, the workability when applying the composition with a metal trowel may decrease.

[0041] The castor oil-based trifunctional polyol can be castor oil or a derivative thereof, and is a polyol with three hydroxyl groups. The hydroxyl equivalent of the castor oil-based trifunctional polyol is preferably 250 to 450; if it is less than 250, the shrinkage stress of the cured product may be so great that the coating film peels off from the underlying concrete, or the curing rate may be so rapid that workability may be poor. If it exceeds 450, the strength of the hydraulic polymer cement composition after curing may be insufficient. The castor oil-based trifunctional polyol is preferably more than 30 parts by weight and not more than 50 parts by weight per 100 parts by weight of the water-dispersible polyol; if it is 30 parts by weight or less, the compressive strength may be insufficient, and if it exceeds 50 parts by weight, the impact resistance may be insufficient.

[0042] 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. The hydroxyl equivalent of the tetrafunctional polyol having a bisphenol A skeleton constituting the water-dispersible polyol is preferably 250 to 450. If it is less than 250, the shrinkage stress of the cured product may increase, causing the coating film to peel off from the underlying concrete, or the curing may be too rapid, resulting in poor workability. If it exceeds 450, the strength of the cured hydraulic polymer cement composition may be insufficient. The tetrafunctional polyol having a bisphenol A skeleton is preferably more than 2 parts by weight and not more than 15 parts by weight per 100 parts by weight of the water-dispersible polyol. If it is less than 2 parts by weight, the compressive strength may be insufficient, and if it exceeds 15 parts by weight, the impact resistance may be insufficient. Although the inclusion of a castor oil-based tetrafunctional polyol in the water-dispersible polyol may result in insufficient strength of the cured product, the compressive strength can be increased to 25 N / mm by further blending glycerin. 2 It can be used as a floor coating material that requires impact resistance as specified in the evaluation items below.

[0043] The amount of water in the water-dispersible polyol may be any amount that allows the polyol to be dispersed, and specifically, the amount is preferably 3 to 8 parts by weight per 100 parts by weight of the total composition.

[0044] The functionality of polyols in this application refers to the nominal value provided by the raw material manufacturer. Even if the functionality of a polyol after strict analysis contains a decimal point, or if other polyols are unintentionally mixed in during the purification of the polyol or the production of the water-dispersible polyol, the polyol still falls within the scope of the present invention.

[0045] <Polyisocyanate> The polyisocyanate constituting the conductive waterborne polymer cement composition is obtained from an aliphatic polyisocyanate and includes an aliphatic isocyanurate having an isocyanurate structure. Specifically, hexamethylene diisocyanurate obtained by cyclotrimerizing 1,6-hexamethylene diisocyanate is preferred because it has excellent weather resistance and improves the hardness of the coating film. The cyclotrimerization of 1,6-hexamethylene diisocyanate can be performed using the method described in JP-A-01-33115. The polyisocyanate used in the present invention can be used in combination with other aliphatic diisocyanates, alicyclic diisocyanates, etc., or prepolymers thereof, and a polyisocyanate content of 99% by weight or more is used.

[0046] The NCO% of the polyisocyanate is preferably 15 to 25% by weight, more preferably 20 to 25% by weight. If it is less than 15% by weight, the strength of the coating film may be insufficient, while if it exceeds 25% by weight, the amount of polyisocyanate having an isocyanurate structure will decrease, and conversely, the amount of non-trimerized polyisocyanate, such as diisocyanate, will increase, which may also result in insufficient strength of the coating film.

[0047] The viscosity of the polyisocyanate is preferably 500 to 3500 mPa·s / 25°C; if it is less than 500 mPa·s, the coating strength may be insufficient, and if it exceeds 3500 mPa·s, workability may decrease when applying it to the concrete surface.

[0048] The amount of polyisocyanate blended is preferably 20 to 40 parts by weight per 100 parts by weight of the total composition; if it is less than 20 parts by weight, the strength of the coating film may be insufficient, and if it exceeds 40 parts by weight, the curing time may be too short, resulting in insufficient workability.

[0049] The compounding ratio of the water-dispersible polyol and polyisocyanate used in the present invention is preferably designed so that the number of NCO groups in the amount of polyisocyanate actually compounded divided by the number of OH groups in the water-dispersible polyol is 2 to 10; if the ratio is less than 2 or more than 10, the finish of the coating film may be poor.

[0050] <Organometallic catalyst> The organometallic catalyst included in the conductive waterborne polymer cement composition is used to accelerate the curing of the composition. Examples of such organometallic catalysts include tin octoate, tin oleate, tin laurate, dibutyltin diacetate, dibutyltin diacetylacetonate, dibutyltin dilaurate, dibutyltin dichloride, lead octoate, lead naphthenate, and bismuth octoate. Among these, organotin compounds are preferred, and dibutyltin diacetylacetonate, dibutyltin diacetate, dibutyltin dilaurate, and dibutyltin dichloride are more preferred in terms of catalytic effect. The amount of organometallic catalyst added is preferably 0.005 to 0.050 parts by weight per 100 parts by weight of the total composition. Less than 0.005 parts by weight may result in insufficient coating strength, while more than 0.050 parts by weight may result in rapid curing, making application with a metal trowel or the like difficult.

[0051] <Carbon fiber> The carbon fibers that make up the conductive waterborne polymer cement composition are blended to impart conductivity. Usable carbon fibers include PAN (polyacrylonitrile)-based fibers, which use acrylic fibers, and pitch-based fibers, which use pitch obtained from by-products such as petroleum and coal tar. Pitch-based fibers are further classified into isotropic pitch and mesophase pitch-based fibers based on the raw materials used. The present invention can use any one or a mixture of two or more of these fibers. The carbon fibers used in the present invention preferably have a length of 0.01 to 2.5 mm and a diameter of 5 to 20 μm. Lengths less than 0.01 mm may result in reduced conductivity, while fibers greater than 2.5 mm may reduce the smoothness of the coating surface due to protrusions from the carbon fibers. Diameters less than 5 μm may result in reduced conductivity, and fibers greater than 20 μm may result in reduced workability using a metal trowel.

[0052] The amount of carbon fiber to be blended is preferably 0.05 to 0.2 parts by weight per 100 parts by weight of the conductive water-based polymer cement composition. If the amount is less than 0.05 parts by weight, the conductivity may be insufficient, while if the amount is more than 0.2 parts by weight, the viscosity of the composition may increase, reducing fluidity (workability), or the smoothness of the coating film may be impaired by bumps formed when the carbon fibers become tangled.

[0053] The incorporation of carbon fibers into a conductive waterborne polymer cement composition not only imparts conductivity, but also improves the strength of the coating film formed by the conductive waterborne polymer cement composition, and is particularly effective in preventing the occurrence of microcracks over time (microcrack resistance).

[0054] <Hydraulic cement> The hydraulic cement that makes up the conductive waterborne polymer cement composition is preferably primarily white Portland cement so that a specific color tone can be imparted, but other materials such as ordinary Portland cement, alumina cement, blast furnace cement, and high-early-strength Portland cement can also be used in combination. The blending amount is preferably 10 to 20 parts by weight per 100 parts by weight of the total composition; if it is less than 10 parts by weight, the strength of the coating film may decrease, and if it exceeds 20 parts by weight, the ease of application when applying the composition to the base concrete surface with a metal trowel or roller brush may decrease.

[0055] <Aggregate> The aggregates that make up the conductive waterborne polymer cement composition can include silica sand, calcium carbonate, and aluminum hydroxide. The particle size is preferably 0.05 to 0.70 mm; if it is less than 0.05 mm, the viscosity of the composition increases, which can reduce application workability. If it exceeds 0.70 mm, the surface smoothness of the coating film may be poor when applied to the concrete floor surface. The blend amount is preferably 25 to 50 parts by weight per 100 parts by weight of the total composition; if it is less than 25 parts by weight, the coating film may not be smooth, and if it exceeds 50 parts by weight, the impact resistance may be reduced.

[0056] In addition to the above, it is preferable to blend slaked lime into the conductive waterborne polymer cement composition, which absorbs carbon dioxide gas generated by the urea reaction between polyisocyanate and water and prevents the carbon dioxide gas generated during the course of application and curing of the composition from concentrating in specific areas and pushing up the coating film, causing swelling.

[0057] In addition to the above, the conductive waterborne polymer cement composition preferably contains additives such as coloring pigments, extender pigments, dispersants, antifoaming agents, and diluents.

[0058] The conductive waterborne polymer cement composition generates extremely small shrinkage stress, which is the stress generated inside the coating film that forms the conductive coated floor. As a result, when a conductive coated floor is formed, the coating film does not peel off due to shrinkage stress at the interface between the coating film layers and the floor base concrete. Furthermore, because the shrinkage stress is extremely small, there is no need to provide joints 3 to 7 mm deep and 3 to 7 mm wide at the edges of the floor base concrete or every 12 m on the surface of the floor base concrete. This allows the conductive coated floor to be formed easily and in a short time, resulting in low cost.

[0059] Furthermore, since the polyisocyanate contained in the conductive waterborne polymer cement composition is an aliphatic isocyanurate, the coating film does not yellow due to sunlight or ultraviolet light, etc., and has an excellent appearance.

[0060] Next, we will explain the method for installing conductive painted floors.

[0061] The method for applying the conductive coated floor of the present invention is to apply the conductive water-based floor coating composition in an amount of 0.7 to 2.0 kg / m onto a concrete floor substrate or an existing coated floor substrate. 2 This is a method for constructing a conductive coated floor, in which a conductive water-based coated floor composition layer is formed by applying a conductive floor coating composition onto the water-based coated floor composition layer, and a conductive floor coating composition is applied thereon to form a conductive floor coating composition layer.

[0062] The conductive coated flooring composition of the present invention can be applied to concrete floor substrates or existing coated floor substrates, such as epoxy coated floors and urethane coated floors. When applying to an existing coated floor substrate, it is recommended to embed a grounding plate in the conductive water-based floor coating composition of the present invention. Sufficient adhesion can be achieved on either substrate by cleaning and, if necessary, polishing.

[0063] When applying the conductive water-based floor coating composition of the present invention, a roller brush or a metal trowel is selected taking into consideration the viscosity and the amount of coating, and the amount of coating is 0.7 to 2.0 kg / m. 2When applying the conductive water-based polymer cement composition as a conductive floor coating material composition, it is preferable to use a metal trowel to apply the composition at a rate of 2.5 to 4.0 kg / m. 2 It is preferable to apply the conductive water-based floor coating composition by polishing.

[0064] Conventionally, when constructing a conductive coated floor using the conductive waterborne polymer cement composition, at least five steps were required: applying a primer, a non-conductive coated floor for surface preparation, and a conductive primer to a concrete floor substrate or an existing coated floor substrate; polishing the conductive primer to ensure adhesion between the conductive primer and the conductive waterborne polymer cement composition; and applying the conductive waterborne polymer cement composition. The conductive coated floor construction method of the present invention uses the conductive waterborne coated floor composition described above, which allows the three steps of applying the non-conductive primer, the non-conductive coated floor as an unevenness corrector, and the conductive primer to be completed in one step using the conductive waterborne coated floor composition. Furthermore, since the conductive waterborne coated floor composition has excellent adhesion to the conductive coated floor composition used as a topcoat, particularly the conductive waterborne polymer cement composition, the polishing step can be omitted. This has the effect of allowing the construction of a conductive coated floor in at least two steps.

[0065] The present invention will be specifically described below with reference to examples and comparative examples. [Example]

[0066] <Conductive Water-Based Floor Coating Compositions of Examples 1 to 3 and Comparative Examples 1 to 6> A conductive waterborne floor coating composition was prepared according to the formulation in Table 1. NPEF-170 (bisphenol F type epoxy resin, epoxy equivalent: 170, product name: Nan-A Plastics Co., Ltd.) was used as epoxy resin A, JER828 (bisphenol A type epoxy resin, epoxy equivalent: 190, product name: Mitsubishi Chemical Corporation) was used as epoxy resin B, Daitoclar X-7028 (styrene adduct of aliphatic polyamine, active hydrogen equivalent: 90, product name: Daito Sangyo Co., Ltd.) was used as amine A, and Adeka Hardener EH-451N (Mannich-modified aliphatic polyamine, The amine C was Tomide TXH674B (polyamidoamine, active hydrogen equivalent: 200, manufactured by T&K TOKA Corporation, product name), the carbon nanotube was a single-walled carbon nanotube with a length of 5 to 2000 μm and an outer diameter of 1.2 to 2.0 nm, the carbon fiber was an isotropic PITCH type carbon fiber with a length of 1.55 mm and a diameter of 13 μm, the hydraulic cement was white cement (manufactured by Taiheiyo Cement Corporation, product name), and the aggregate was Sarawak silica sand (average particle size D 50 : 150 μm, manufactured by Tochu Co., Ltd., product name) and Mikawa silica sand R556 (average particle size D 50 A 1:1 weight ratio mixture of two materials (a 1:200 μm thick, manufactured by Mikawa Silica Co., Ltd., trade name) was used, and Epotec RD105 (a reactive diluent, manufactured by Aditya Birla, trade name) was used as the diluent. Water and additives, selected from commercially available antifoaming agents and dispersants for water-based compositions, were also used. These materials were uniformly mixed and dispersed to prepare the conductive water-based floor coating compositions of Examples 1 to 3 and Comparative Examples 1 to 6.

[0067] <Conductive Water-Based Floor Coating Material Composition of Comparative Example 7> In Comparative Example 7, water-based conductive primer JA-60 (product name, manufactured by Aica Kogyo Co., Ltd., containing 21% by weight of artificial graphite as a conductive material, epoxy resin-based, containing no cement or aggregate) was used.

[0068] [Table 1]

[0069] <Conductive Water-Based Polymer Cement Composition> A conductive waterborne polymer cement composition was used as the conductive floor coating composition for the following evaluation. The conductive waterborne polymer cement composition contained 35 to 40 parts by weight of a castor oil-modified trifunctional polyol with a hydroxyl equivalent of 350 as a water-dispersible polyol, 5 to 10 parts by weight of a tetrafunctional polyol having a bisphenol A skeleton with a hydroxyl equivalent of 360, 20 to 25 parts by weight of a sulfonic acid ester compound (Mezamol; trade name, manufactured by Bayer) as a diluent, and 30 parts by weight of water (ion-exchanged water), totaling 100 parts by weight. The composition contained 40 parts by weight of a water-dispersible polyol with a hydroxyl equivalent of 500 to 800, and trimerized hexamethylene diisocyanurate TPA-100 (viscosity 25 The following materials were used: 60 parts by weight of a 0.00 mPa·s / 25°C (NCO%: 23 wt%) polyisocyanate content (≥99 wt%), manufactured by Asahi Kasei Corporation (trade name); 0.025 parts by weight of Neostan U220H (dibutyltin diacetylacetonate, manufactured by Nitto Kasei Corporation (trade name)) as an organometallic catalyst; 0.15 parts by weight of isotropic PITCH-type carbon fibers measuring 1.55 mm in length and 13 μm in diameter; 30 parts by weight of white Portland cement (manufactured by Taiheiyo Cement Corporation) as hydraulic cement; and 60 parts by weight of No. 6 silica sand (manufactured by Tohoku Silica Co., Ltd. (trade name)) with a particle size of 0.05–0.6 mm as aggregate. Other additives used included a defoamer and a dispersant, which were selected from commercially available products for aqueous compositions. These ingredients were uniformly mixed and stirred to prepare a conductive aqueous polymer cement composition.

[0070] <Layer structure of conductive painted floor> According to Tables 2 and 3, conductive coated floors were formed using JE-70 (a solvent-based epoxy resin, manufactured by Aica Kogyo Co., Ltd., product name) as a non-conductive primer, JE-20G (an epoxy resin-based coated floor material, manufactured by Aica Kogyo Co., Ltd., product name) as an unevenness correction agent, the conductive water-based coated floor composition of the above examples and comparative examples, and the above conductive water-based polymer cement composition, and these were designated Examples I to V and Comparative Examples I to VII. Note that cases where the cured coating surface of the conductive water-based coated floor material composition was polished were marked with "◯," and cases where the step was omitted or polishing was not performed were marked with "-."

[0071] [Table 2]

[0072] [Table 3]

[0073] <Evaluation method> The following evaluations were carried out for the above Examples and Comparative Examples. Unless otherwise specified, the preparation of test specimens, curing, and evaluation tests were carried out in an environment of 23°C and 50% RH.

[0074] <Adhesion> A predetermined amount of the conductive water-based floor coating composition of the Examples and Comparative Examples was applied with a metal trowel to the surface of a 300mm x 300mm, 60mm thick dry concrete slab (5% or less measured with a HI-520 concrete moisture meter in the concrete range) as specified in JIS A 5371, and after curing for 15 hours, a predetermined amount of the conductive water-based polymer cement composition was applied with a metal trowel and cured for 7 days to prepare a test specimen. The adhesion strength (N / mm) of a 40 x 40mm section was measured using a Construction Research Institute type adhesion tester. 2 ) was measured. The adhesive strength was 1.5N / mm 2 The bond strength was evaluated as sufficient if the bond strength was greater than 100%. The failure state was evaluated as ○ if the base concrete failed 100% cohesively, and × if the failure state was other than 100%.

[0075] <Irregularity correctability> In this application, the ability of a material to smooth an uneven surface by applying it to the surface is evaluated from the perspective of workability and pinhole prevention. If it is not possible to apply any of the materials in the amounts shown in Tables 2 and 3, or if the surface appears smooth but pinholes are visible on closer inspection, the material may not perform as intended as a conductive floor coating material.

[0076] <Workability> The conductive water-based floor coating compositions of the Examples and Comparative Examples were evaluated as ◯ if they could be applied to the surface of a JIS A 5371-specified 300 x 300 mm, 60 mm thick dry concrete slab (5% or less measured with a HI-520 concrete moisture meter in the concrete range) with a metal trowel in the amount shown in Tables 2 and 3, and evaluated as × if they could not.

[0077] <Pinhole suppression effect> The conductive water-based floor coating compositions of the Examples and Comparative Examples were applied to the surface of a JIS A 5371-specified 300 x 300 mm, 60 mm thick dry concrete slab (5% or less measured with a HI-520 concrete moisture meter in the concrete range) with a metal trowel in the amounts shown in Tables 2 and 3. After hardening, the condition of the coating surface was visually checked, and samples with 5 or fewer pinholes were rated as good, and samples with 6 or more pinholes were rated as bad.

[0078] <Anti-static properties> A specified amount of the conductive waterborne floor coating composition from each Example and Comparative Example was applied to the surface of a JIS A 5430-specified flexible board (900 x 900 mm, 7 mm thick) with a metal trowel and cured for 15 hours. Then, a specified amount of the conductive waterborne polymer cement composition was applied with a metal trowel and cured for 7 days to prepare a test specimen. In accordance with NFPA-56A Standard for the Use of Inhalation Anesthetics, two specified electrodes weighing 2.27 kg (5 lbs) were placed on the conductive coated floor at a distance of 91.4 cm (3 ft), and surface resistance was measured at an applied voltage of 500 V. A resistance greater than 0.01 MΩ but less than 100 MΩ was evaluated as conductive (antistatic) and rated as "Good," while other resistances were rated as "Poor."

[0079] <AGV resistance> Test specimens were prepared by applying a prescribed amount of the conductive waterborne floor coating composition of each Example or Comparative Example to the surface of a 300mm x 300mm, 60mm-thick dry concrete slab (measured at 5% or less using a HI-520 concrete moisture meter in a JIS A 5371 concrete range) with a metal trowel and curing for 15 hours. Then, a prescribed amount of the conductive waterborne polymer cement composition was applied with a metal trowel and cured for 7 days. The test specimens were subjected to a stationary cutting test (urethane tire, load: 600 kg, speed: 12.5 times / min, stationary cutting angle: 90°C) and subjected to 10,000 cutting operations. After the test, the coating film was observed and rated as follows: ◯ (no significant wear damage or abrasion), △ (no wear damage or abrasion but some lifting between the conductive layer and the coating), and × (any abnormality).

[0080] <Impact resistance> A test specimen was prepared by applying a predetermined amount of the conductive waterborne floor coating composition of each Example or Comparative Example with a metal trowel to the surface of a JIS A 5371 300mm x 300mm, 60mm thick dry concrete slab (5% or less moisture content measured with a HI-520 concrete range ket moisture meter). The test specimen was then cured for 15 hours, followed by applying a predetermined amount of the conductive waterborne polymer cement composition with a metal trowel and curing for 7 days. A 1kg steel ball was dropped 60 times onto the center of the test specimen from a height of 1m. Test specimens were rated as ◯ if no cracks, peeling, or other defects were observed; △ if no cracks, peeling, or other defects were observed but the coating film peeled after 60 drops; and × if cracks, peeling, or other defects were observed after fewer than 60 drops.

[0081] <Number of processes> In the examples and comparative examples, those with two steps to form the conductive coated floor were rated as excellent in terms of process-saving, with a rating of ◯, while those with more than two steps were rated as ×, with the number of steps being too many and requiring time and effort, and therefore not excellent in terms of process-saving.

[0082] <Evaluation results> The evaluation results are shown in Tables 4 and 5.

[0083]

Table 4

[0084]

Table 5

Claims

1. an epoxy resin, an amine, carbon nanotubes, hydraulic cement, a filler, an aggregate, and water; The epoxy resin is a bisphenol F epoxy resin, The amine is a modified aliphatic polyamine, The carbon nanotubes are present in an amount of 0.0030 to 0.0065 parts by weight based on 100 parts by weight of the total composition; The aggregate is 25 to 55 parts by weight per 100 parts by weight of the total composition. Conductive water-based floor coating composition.

2. The hydraulic cement is present in an amount of 10 to 30 parts by weight per 100 parts by weight of the total composition; The water is 10 to 30 parts by weight per 100 parts by weight of hydraulic cement. The conductive water-based floor coating composition according to claim 1.

3. On top of a concrete floor base or an existing painted floor base, The conductive water-based floor coating composition according to claim 1 or 2 is applied in an amount of 0.7 to 2.0 kg / m ２ to form a conductive water-based floor coating composition layer, A conductive floor coating composition is applied thereon to form a conductive floor coating composition layer. How to install conductive painted floors.

4. The conductive floor coating composition is a conductive water-based polymer cement composition containing a water-dispersible polyol, a polyisocyanate, an organometallic catalyst, carbon fiber, hydraulic cement, and an aggregate, the water-dispersible polyol contains water, a castor oil-based trifunctional polyol, and a tetrafunctional polyol having a bisphenol A skeleton, has a hydroxyl group equivalent of 500 to 800, and is contained in an amount of 10 to 30 parts by weight per 100 parts by weight of the entire composition, and the castor oil-based trifunctional polyol is contained in an amount of more than 30 parts by weight and not more than 50 parts by weight per 100 parts by weight of the water-dispersible polyol; The polyisocyanate contains an aliphatic isocyanurate and is present in an amount of 20 to 40 parts by weight per 100 parts by weight of the total composition; the carbon fiber has a length of 0.01 to 2.5 mm and a diameter of 5 to 20 μm, and is present in an amount of 0.05 to 0.2 parts by weight per 100 parts by weight of the total composition; The hydraulic cement is 10 to 20 parts by weight per 100 parts by weight of the total composition, The aggregate is 20 to 50 parts by weight per 100 parts by weight of the total composition. A method for applying the conductive coated floor according to claim 3.

5. A conductive coated floor formed by the conductive coated floor construction method according to claim 3.

6. A conductive coated floor formed by the conductive coated floor construction method according to claim 4.

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