JP5392991B2 - Conductive floor and construction method - Google Patents

Description

  The present invention relates to a conductive coating floor.

The synthetic resin-coated floor becomes a poor conductor due to the properties of the synthetic resin, generates static electricity, and takes time to disappear. In order to prevent electrification, powders of electrical good conductors such as metals and zinc oxide and fibrous substances are known. Such a technique is widely used industrially. For example, as a specification of the conductive coating floor, a method of forming from three layers of undercoat, intermediate coat, and topcoat has been proposed. A conductive top coating material containing conductive fibers for the undercoat, conductive graphite for the intermediate coat, and a conductive inorganic material such as zinc oxide is used for the top coat. (Patent Document 1)
Further, the use of the graphite improves the low cohesive force of film formation and the workability with a hard porous carbon material. (Patent Document 2)
Volatile organic compounds (VOC) are the causative substances of secondary product particles of photochemical oxidants and suspended particulate matter (SPM). Photochemical oxidants are a mixture of organic compounds containing nitrogenous oxides and nitrogen oxides in the atmosphere. The secondary product particles of SPM generated by sunlight irradiation are generated by a chemical reaction of VOC in the atmosphere and condensation of the reaction product. The conductive primer of the conductive coating floor material uses a lot of organic solvent, dissipates VOC, and places a load on the environment.
JP-A-8-143793 JP 2005-97512 A

  The problem to be solved by the present invention is to provide a conductive coating floor and a construction method having a conductive performance, having a light color or having a high degree of freedom in coloring, and having a good surface condition.

The invention of claim 1 applies a water-based epoxy resin primer which has a solid content of 50 to 70% and a fixed carbon content of 90% or more and contains 30 to 50% of graphite having an average particle size of 10 to 100 μm. In addition, an undercoat material layer having a surface resistance value after curing of 20 kΩ or less, and a top coat material containing a conductivity imparting component having a surface resistance value after coating and curing of 100 MΩ or more alone at 0.3 kg / m ² or less. It is a conductive coated floor that has a surface resistance value of 10 ⁴ to 10 ⁸ Ω after coating and curing. A conductive coated floor with stable conductivity, good surface condition, lighter coloration, and high degree of freedom in coloring is obtained. It is done.

The invention according to claim 2 is characterized in that the electroconductivity coating component of the top coat material is a light color electroconductivity imparting material and can be lightened and has a high degree of freedom in coloring. A conductive coating floor having a light color and a high degree of freedom in coloring can be obtained on the floor.

The invention according to claim 3 applies a water-based epoxy resin primer which has a solid content of 50 to 70% and a fixed carbon content of 90% or more and contains 30 to 50% of graphite having an average particle size of 10 to 100 μm. In addition, an undercoat material layer having a surface resistance value after curing of 20 kΩ or less, and a top coat material containing a conductivity imparting component having a surface resistance value after coating and curing of 100 MΩ or more alone at 0.3 kg / m ² or less. 3. The method for constructing a conductive coated floor according to claim 1, wherein the surface resistance value after coating and curing is 10 < ⁴ > to 10 < ⁸ > [Omega], stable conductivity and adhesion It becomes an excellent conductive coated floor.

  According to the present invention, it is possible to obtain a conductive coating floor and a construction method that have conductive performance, have a light color, have a high degree of freedom in coloring, and have a good surface condition.

  Countermeasures against adverse effects of static electricity can be taken by setting the leakage resistance value with the ground within an appropriate range. In order to express the leakage resistance value uniformly, the optimization of the surface resistance value is governed, and the undercoat material of the present invention interacts with the top coating material, optimizes the surface resistance value, and consequently reduces the leakage resistance value. It can be controlled. In general, lowering the resistance value of the top coating material is a disadvantageous condition for surface condition such as long fibers, large particle size, containing a large amount of conductive material, and lightening. , Increase the degree of freedom. In addition, depending on the dependency of the undercoat material, by partially coating the undercoat material, it is possible to use the same material as that of the normal application floor without changing the surface state.

Undercoat Material An undercoat material plays a major role in order to develop the conductivity of the coated floor of the present invention. One is conductivity, that is, a low resistance value as a layer. The other is to increase the cohesive strength of the top coat by incorporating the binding component of the top coat, and to set the density of the conductivity imparting component of the top coat, as well as the conductivity and surface resistance of the coat, to an appropriate range. be able to.
Although it is a simple measurement method for measuring the surface resistance of the undercoat material, etc., a copper plate having a thickness of 23 mm and a diameter of 1.5 mm is used as an electrode, and an interval of 10 cm is provided (the interval here is the shortest distance of the electrode edge). Measure 10 values and use the highest value. The surface resistance value of the undercoat material is 20 kΩ or less, preferably 10 kΩ or less. It should be noted that the measurement resistance value is not a high resistance value and is not a low resistance effected by contact resistance, so a general-purpose measuring instrument or tester may be used. Examples of measuring instruments include SD-420C and GD9 manufactured by Sanwa Electronic Instruments Co., Ltd.
In addition, it is necessary to incorporate a binding component of the topcoat material. This is largely due to the shape and nature of the conductivity-imparting component of the undercoat to satisfy the above-mentioned conductivity. Further, the solid content and the conductive compound content in the solid content are affected. That is, when the solid content is 50 to 70% and the conductive compound content is 30 to 50% with respect to the solid content, the top coating material can be taken in, the drying and curing are good, and the workability is also preferable. The conductivity imparting component of the undercoat material is not limited as long as the above properties are obtained, but artificial graphite is preferable. The average particle diameter is preferably 10 to 100 μm and the fixed carbon is preferably 90% or more. The undercoat material has a grounding effect, so it has never exceeded its conductivity (low resistance). For this reason, it is possible to use the conductive inorganic material and artificial graphite in combination as long as the binding component of the topcoat material is incorporated and there is no problem in aggregation, adhesion, and the like. As the conductive inorganic material, other carbon graphite, carbon fiber, metal oxides such as tin, aluminum, copper, nickel, zinc, antimony and titanium, or a combination of two or more selected from these are used. The particle size of the graphite can be measured by a laser diffraction scattering method, and the specific device name can be measured by a SK Laser Micronizer manufactured by Seishin Corporation.
As the binding resin, there are an epoxy resin, a urethane resin, and the like, and an epoxy resin is preferable from the viewpoint of adhesion and water-based possibility. The binder resin is blended in a weight ratio of 1: 0.5 to 2 with respect to the conductivity imparting component.

Surface resistance value The surface resistance value of the present invention is a simple measurement method described in the above primer, but the surface resistance value of the topcoat material alone or as a conductive coating floor is the electrical performance of the conductive floor / antistatic floor. NFPA (National Fire Protection Association) 99 standard, where the evaluation method is specified, is a resistance value measured by an insulation resistance meter between two points of the floor surface 914mm away, construction method, conditions It is considered appropriate as a management value including Hereinafter, the NFPA method is used. It can be measured with an applied voltage of 500 V using DM1528S manufactured by Sanwa Electronic Instruments Co., Ltd.

The top coat material conductivity imparting component is a black carbon-based material or metal, metal oxide, etc., and has very little transparent material. Need to reduce. By reducing the conductivity imparting component to such an extent that the surface resistance value becomes 100 MΩ or more by the NFPA method of the topcoat material alone, it is possible to obtain a topcoat material with a good surface state, light coloration and high degree of freedom in coloring. Although there are no particular restrictions on the conductivity-imparting component, light-colored conductivity-imparting materials such as mica deposited with metal, glass flakes deposited with metal, and zinc oxide are convenient from the viewpoint of transparency and coloring freedom. Artificial graphite, carbon graphite, carbon fiber, tin, aluminum, copper, nickel, zinc, antimony, titanium, and other metal oxides may be used in combination depending on the use and coloring degree. The binding resin for the top coat is not limited. As the binding resin, an epoxy resin, a urethane resin or the like can be used, and the solid content is not limited. It may be solvent-free.

Construction method If there is unevenness in the ground and the undercoat layer is discontinuous, fill the cracks and depressions with the ground conditioning material. An undercoat material is applied thereon. The application amount of the undercoat material is determined by the relationship with the overcoat material. When the undercoat material has a solid content of less than 0.04 kg / m ² , conductivity and a desired surface resistance value cannot be obtained as a coating floor. In addition, the surface resistance value can be almost set by the amount of application of the topcoat material to the amount of transition to the undercoat material of the topcoat material and the amount of application of the topcoat material. If this is a circuit for measuring the surface resistance value, all the parallel circuit resistances between the two points will be obtained. In the present invention, the undercoat material has a low resistance per unit, and the overcoat material has a high resistance value as it goes to the surface layer. It acts as a series resistor. When the topcoat layer becomes thick, it does not drop below the surface resistance value of the topcoat material alone. That is, the coating amount of the topcoat material is preferably 0.3 kg / m ² or less, and when it exceeds 0.3 kg / m ² , almost only the topcoat material is present. Therefore, the effect of the present invention cannot be obtained. The lower limit depends on functions such as the appearance of the top coat.

Hereinafter, description will be made based on examples.
A blending example of the undercoat material and the conductive top coat material is shown below.

Undercoat material 1
Epoxy resin epicoat # 828 (trade name, manufactured by Japan Epoxy Resin Co., Ltd., bisphenol A type liquid resin) 20 parts by weight, Adeka Hardener EH-4227 (trade name, Asahi Denka Kogyo Co., Ltd.) as an epoxy curing agent capable of self-emulsification , Solid content 70%) 15 parts by weight, Ancamine K54 (trade name, Air Products Trisdimethylaminomethylphenol) 3.5 parts by weight as an epoxy curing agent, SNP-99 (trade name, Kobayashi Co., Ltd.) as artificial graphite 25 parts by weight of SHOJI CO., LTD., Fixed carbon 99.0%, average particle size 12 μm) was mixed and stirred with a power mixer PM850 manufactured by Ryobi Co., and 36.5 parts by weight of water was added, and dispersed and emulsified. Undercoat material 1 was obtained.

Undercoat material 2
Undercoat material 2 was prepared in the same manner as in the case of using artificial graphite for undercoat material 1 as SNP-90 (trade name, manufactured by Kobayashi Corporation, fixed carbon 90.0%, average particle size 23 μm).

Undercoat material 3
Undercoating material 3 was prepared in the same manner as that of CB-100 (trade name, manufactured by Nippon Graphite Industry Co., Ltd., fixed carbon 98.0%, average particle size 100 μm).

Undercoat 4
Artificial graphite of the undercoat material 1 was the same as the undercoat material 4 except for graphite-DS (trade name, manufactured by Osaka Kasei Co., Ltd., fixed carbon 85.0%, average particle size 20 μm).

Undercoat material 5
Artificial graphite for the undercoat material 1 was the same as the undercoat material 5 except for AGP-special S (trade name, manufactured by Kobayashi Corporation, fixed carbon 97.0%, average particle size 3 μm).

Undercoat material 6
Artificial graphite for the undercoat material 1 was the same as the undercoat material 6 except for XD150 (trade name, manufactured by Ito Graphite Co., Ltd., fixed carbon 98.0%, average particle size 150 μm).

Undercoat material 7
Epoxy resin Piquat # 828 (trade name, manufactured by Japan Epoxy Resin Co., Ltd., bisphenol A type liquid resin) 35 parts by weight, Adeka Hardener EH-4227 (trade name, Asahi Denka Kogyo Co., Ltd.) as a self-emulsifiable epoxy curing agent , Solid content 70%) 25 parts by weight, Ancamine K54 (trade name, Air Products Trisdimethylaminomethylphenol) 5 parts by weight as an epoxy curing agent, SNP-99 (trade name, manufactured by Kobayashi Corporation) as artificial graphite 5 parts by weight of fixed carbon (99.0%, average particle size 12 μm) was mixed and stirred with a power mixer PM850 manufactured by Ryobi Co., Ltd., and 30 parts by weight of water was further added, dispersed and emulsified, and undercoat 7 It was.

The following is an example of the top coat composition.

Topcoat 1
Epicoat # 828 (trade name, manufactured by Japan Epoxy Resin Co., Ltd., bisphenol A type liquid resin) 20 parts by weight as epoxy resin, 3 parts by weight of titanium white, Minatec 40CM (trade name, Merck Japan Co., Ltd.), 5 parts by weight of conductive mica), 10 parts by weight of BM-200 (trade name, Sakai Chemical Industry Co., Ltd., precipitated barium sulfate) to provide chicotropic properties, self-emulsifiable epoxy curing agent Adeka Hardener EH -4227 (trade name, Asahi Denka Kogyo Co., Ltd., solid content 70%) 15 parts by weight, epoxy curing agent Ancamine K54 (trade name, Trisdimethylaminomethylphenol manufactured by Air Products), other finishes, dispersibility 2 parts by weight of additives, etc., are mixed with Ryobi Co., Ltd. power mixer PM850 And 拌, further adding 40 parts by weight of water, and dispersed and emulsified, and the overcoating material 1. 1 square meters flexible plate to the overcoating material 1 to 0.15 k g / ^{m 2} 2 coats of top coat material 1 alone conductivity values after curing was surface resistance 100MΩ or more between two points in NFPA Method .

Topcoat 2
Epoxy resin, Epicoat # 828 (trade name, manufactured by Japan Epoxy Resin Co., Ltd., bisphenol A type liquid resin) 20 parts by weight, titanium white 2 parts by weight, conductive filler Minatec 40CM (trade name, Merck Japan Co., Ltd., conductive) Self-emulsifiable epoxy curing agent Adeka Hardener EH-4227 (trade name, Asahi Denka Kogyo Co., Ltd., 70% solids), epoxy curing agent Ancamine K54 (trade name, Air) 5 parts by weight of Trisdimethylaminomethylphenol (Products), 2 parts by weight of other additives such as finishing and dispersibility, these were mixed and stirred with a power mixer PM850 manufactured by Ryobi Co., Ltd., and further 36 weights of water Part was added, and dispersed and emulsified to obtain topcoat material 2. 1 m square flexible board to the overcoat material 2 0.15 k g / ^{m 2} 2 coats of topcoat material 2 alone conductivity values after curing was surface resistance 100MΩ or more between two points in NFPA Method .

Topcoat 3
Epoxy resin, Epicoat # 828 (trade name, manufactured by Japan Epoxy Resin Co., Ltd., bisphenol A type liquid resin) 20 parts by weight, titanium white 10 parts by weight, conductive zinc oxide A (trade name, Honjo Chemical ( Co., Ltd., conductive zinc oxide) 20 parts by weight, self-emulsifiable epoxy curing agent Adeka Hardener EH-4227 (trade name, Asahi Denka Kogyo Co., Ltd., solid content 70%) 15 parts by weight, epoxy curing agent Ancamine K54 (Trade name, Trisdimethylaminomethylphenol manufactured by Air Products) 5 parts by weight, 2 parts by weight of additives such as other finishes and dispersibility, these are mixed and stirred with Ryobi Corporation power mixer PM850, Furthermore, 28 parts by weight of water was added, and dispersed and emulsified to obtain a top coating material 3. 1 the topcoat material 3 is flexible plate of square meters 0.15 k g / ^{m 2} 2 coats, the topcoat material 3 single conductive value after curing was surface resistance 100MΩ or more between two points in NFPA Method .

Examples and comparative examples are shown below. In Examples and Comparative Examples, a 1 meter square flexible plate was used as a base.

After applying the undercoat material 1 at 0.15 kg / m ² , the overcoat material 1 was applied twice at 0.15 kg / m ² to obtain Example 1.

After applying the undercoat material 2 at 0.15 kg / m ² , the overcoat material 1 was applied twice at 0.15 kg / m ² to obtain Example 2.

After applying the undercoat material 3 at 0.15 kg / m ² , the overcoat material 1 was applied twice at 0.15 kg / m ² to obtain Example 3.

After the undercoat material 1 was applied at 0.15 kg / m ² , the overcoat material 2 was applied twice at 0.15 kg / m ² to obtain Example 4.

After applying the undercoat material 1 at 0.15 kg / m ² , the overcoat material 1 was applied twice at 0.1 kg / m ² to obtain Example 5.

After applying the undercoat material 2 at 0.15 kg / m ² , the overcoat material 1 was applied twice at 0.1 kg / m ² to obtain Example 6.

After applying the undercoating material 1 at 0.15 kg / m ² , the overcoating material 3 was applied twice at 0.15 kg / m ² to obtain Example 7.

After applying the undercoat material 5 at 0.15 kg / m ² , the overcoat material 1 was applied twice at 0.15 kg / m ² to obtain Example 8.

After applying the undercoating material 6 at 0.15 kg / m ² , the top coating material 1 was applied twice at 0.15 kg / m ² to obtain Example 9.

Comparative Example 1
After applying the undercoat material 4 at 0.15 kg / m ² , the overcoat material 1 was applied twice at 0.15 kg / m ² to obtain Comparative Example 1.

Comparative Example 2
After applying the undercoat material 7 at 0.15 kg / m ² , the overcoat material 1 was applied twice at 0.15 kg / m ² to obtain Comparative Example 2.

下塗り単独抵抗値：２３φ１．５ｍｍ厚の銅板を電極とし１０ｃｍの間隔をあけて三和電子計器（株）製ＳＤ−４２０Ｃを用いて抵抗値を測定し、場所を変えて計１０点で測定を行いそのときの最大の抵抗値を５ｋΩを単位として、切り上げて表記した。
導電性：ＮＦＰＡ法で２点間の表面抵抗値を測定し、上塗り材塗布硬化後の測定数値は表１では１０の累乗指数で示し、１０^４〜１０^８Ωの範囲であれば○。それ以外は×とした。
隠蔽性：上塗り塗布後、白色が良好なものは○。下地の色が透けて灰色になったものは×とした。
密着性：３０×３０ｃｍ舗道板（モルタル板）にＪＥ−７１（アイカ工業（株）製、エポキシ樹脂系下地調整プライマー）塗布後、各例の条件で塗布し、その後２０℃、５０％ＲＨで１週間養生した後、ＪＩＳ Ｋ５５３６建研式引張試験にて密着性を評価。下地コンクリート破壊の場合は○。上塗りとの界面破壊もしくは導電プライマーの凝集破壊の場合は×とした。

Undercoat single resistance value: The resistance value is measured using SD-420C manufactured by Sanwa Electronic Instruments Co., Ltd., using a copper plate of 23φ1.5 mm thickness as an electrode and spaced by 10 cm, and measured at a total of 10 points at different locations. The maximum resistance value at that time was rounded up to the nearest 5 kΩ.
Conductivity: The surface resistance value between two points is measured by the NFPA method, and the measured numerical value after applying and curing the top coat material is shown as a power of 10 in Table 1, and it is ◯ if it is in the range of 10 ⁴ to 10 ⁸ Ω. Otherwise, it was set as “x”.
Concealability: ○ when the white color is good after top coating. Those in which the base color was transparent and turned gray were marked with x.
Adhesiveness: After applying JE-71 (Eika Kogyo Co., Ltd., epoxy resin base preparation primer) to a 30 × 30 cm pavement board (mortar board), it was applied under the conditions of each example, and then at 20 ° C. and 50% RH. After curing for 1 week, the adhesion was evaluated by JIS K5536 Kenken type tensile test. ○ in the case of foundation concrete destruction. In the case of interfacial breakage with the top coat or cohesive breakage of the conductive primer, x was given.

Claims (3)

Surface resistance after curing by applying a water-based epoxy resin primer having a solid content of 50 to 70% and a fixed carbon content of 90% or more and containing 30 to 50% of graphite having an average particle size of 10 to 100 μm. The surface after curing is applied with an undercoating material layer having a value of 20 kΩ or less, and a top coating material containing a conductivity-imparting component having a surface resistance value of 100 MΩ or more after coating and curing alone at 0.3 kg / m ² or less. A conductive coated floor having a resistance value of 10 ⁴ to 10 ⁸ Ω.   2. The conductive coating floor according to claim 1, wherein the electroconductivity imparting component of the top coat material is a light color electroconductivity imparting material, so that the color can be reduced and the degree of freedom in coloring is high. Surface resistance after curing by applying a water-based epoxy resin primer having a solid content of 50 to 70% and a fixed carbon content of 90% or more and containing 30 to 50% of graphite having an average particle size of 10 to 100 μm. The surface after curing is applied with an undercoating material layer having a value of 20 kΩ or less, and a top coating material containing a conductivity-imparting component having a surface resistance value of 100 MΩ or more after coating and curing alone at 0.3 kg / m ² or less. conductive coating method of constructing the floor according to any one of claims 1 to 2 resistance is characterized by comprising a 10 ⁴ ~10 ⁸ Ω.