JP2573105B2 - Conductive paint layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive floor for preventing the occurrence of static electricity in an operating room, a computer room, a factory for manufacturing electronic components such as LSIs, and the like. In addition, the present invention relates to a conductive paint layer that can be used for external painting of devices, equipment, electronic equipment, and the like that require antistatic in a petroleum refinery, a chemical factory, a paint factory, and the like.

[0002]

2. Description of the Related Art Conventional conductive paint layers formed at the time of various types of external coating and floor coating include (1) a synthetic resin vehicle and a conductive resin as disclosed in JP-A-59-145262. A conductive coating layer comprising a conductive zinc oxide and a coloring agent, wherein the conductive zinc oxide comprises 38-60% by weight of the solid content of the coating, and (2) disclosed in JP-A-2-187472. As described above, paramagnetic metal powder (a rare earth element such as nickel, iron, neodymium or a coordination compound thereof)
A metal powder composed of 0% by weight and 50 to 0% by weight of a conductive metal powder (gold, silver, copper, aluminum) and a phenol resin, an acrylic resin, an ethoxy resin or the like as a binder component. 100 to 900 parts by weight of metal powder per 100 parts by weight (preferably 200 to 8 parts by weight)
(3 parts) as disclosed in Japanese Patent Application Laid-Open No. Sho 60-172534, in which the volume resistivity is 8 × 10 ⁻⁴ Ω. For the purpose of obtaining a high shielding effect against electromagnetic waves for both electric and magnetic fields over a wide frequency band, as a shielding member for electromagnetic waves, a first shielding layer coated with a conductive paint of nickel, and a composite of silver and copper A second shield layer formed by applying a conductive paint. (4) As disclosed in Japanese Patent Publication No. 2-61799, conductive zinc oxide is uniformly dispersed in the form of secondary particles. Synthetic resin vehicle formed by applying a coating composition containing a colorant as an undercoat on a base, and a synthetic resin vehicle in which conductive zinc oxide is uniformly dispersed in the form of secondary particles. , A coating composition containing a coloring agent, formed by applying a coating composition containing a coloring agent as an undercoat on an undercoat, forming a conductive zinc oxide in the form of primary particles, and uniformly dispersing the same. (5) As disclosed in Japanese Patent Application Laid-Open No. 62-114686, as a method for forming a transparent conductive coating film, a transparent check or a light sensor check can be performed. However, the purpose of forming a conductive film is to form on the surface of a transparent base material a paint in which fine powder of conductive tin oxide is mixed as a conductive metal oxide with a synthetic resin binder, and the surface is ion-crosslinked. Many conductive coating layers are known in which a conductive metal powder is used in combination with a synthetic resin vehicle, such as a surface-treated coating and drying of an aqueous dispersion of a polymer having bonds.

[0003]

However, these known conductive paint layers are capable of obtaining a leakage resistance of 10 ⁸ to 10 ¹¹ Ω or less as indicated in the Ministry of Labor's Electrostatic Safety Guidelines. ) Cannot be obtained, and even if it is possible, stability over time cannot be obtained. In particular, when the layer forming material is a water-containing member such as concrete, mortar, slate plate or the like, the water content is 2% or more. At 5%, the leakage resistance is 10 ⁷
Ω or less, but when the water content becomes 0% by drying, the leakage resistance becomes 10 ¹³ Ω or more.

In the case of using the conductive tin oxide of the above (5), a leakage resistance of 10 ⁶ Ω can be obtained, but the weather resistance is inferior. Regarding the mixing ratio with the synthetic resinous binder, a very fine powder having a film thickness (about 1 μm) or less is used because of the required transparency and the surface resistivity of the coating layer. In addition, it is necessary to use a large amount of conductive tin oxide fine powder of 1.85 to 5.7 times the amount of the synthetic resin binder 1, which results in high cost and stability over time. Furthermore, as described above, when the water content becomes 0% by drying, the leak resistance becomes 10 ¹³ Ω or more, and the operating room, the computer room, or the LS
There is a problem to be solved in that it lacks practicality as a conductive paint layer formed at the time of conductive floor coating for preventing the occurrence of static electricity in electronic component manufacturing factories such as I.

According to the present invention, a conductive nickel powder is blended and used as an undercoat layer under certain conditions, and a conductive tin oxide powder or a conductive zinc oxide powder is blended and used as an overcoat layer under certain conditions. The purpose of the two-layer structure used is to form a conductive paint layer having a low leakage resistance of 10 ⁷ Ω or less and a high temporal stability.

[0006]

The conductive coating layer of the present invention comprises a conductive nickel powder and a synthetic resin vehicle, each having a secondary particle size of 50 to 150 μm, and a ratio of conductive nickel powder / synthetic resin vehicle = 0.5. １．５1.5, a conductive nickel powder dispersed uniformly in a synthetic resin vehicle was coated with a conductive paint to form an undercoat conductive paint layer. The following primary particles of conductive tin oxide powder or conductive zinc oxide powder and a synthetic resin vehicle containing a coloring agent are mixed with conductive tin oxide powder or conductive zinc oxide powder / synthetic resin vehicle = 0.5 to 1 .5 mixed,
It is characterized by being formed by applying a conductive paint in which conductive tin oxide powder or conductive zinc oxide powder is uniformly dispersed in a synthetic resin vehicle.

[0007]

Next, examples of the undercoating conductive paint layer of the present invention will be described in comparison with the case where conductive nickel powder, conductive zinc oxide powder, and conductive tin oxide powder are used. It is.

[0008]

[Table 1] Dispersants, leveling agents, anti-settling agents, and defoamers were used as additives. Xylene, isobutyl alcohol and butyl cellosolve were used as mixed solvents for the main agent, and toluene, isobutyl alcohol and butyl cellosolve were used as mixed solvents for the curing agent. However, aromatic hydrocarbons, alcohols, ketones, esters,
Ether-based can be used. Dispersion method: Using a stirrer or the like to form secondary particles of 50 to 150 microns. Painted plate making method: 150mm x 600mm acrylic plate (10 ¹⁶
Ω) with 150-200g / m2 of paint.

As is clear from the above comparison, the resistance using the conductive nickel powder was extremely low as compared with the resistance using the conductive zinc oxide or the conductive tin oxide. However, since the conductive paint layer formed by applying a paint using conductive nickel powder as the conductive metal powder has a problem in that it is not practical in terms of smoothness and color, this is used as an undercoat layer, and is shown below. An overcoat layer of a paint was formed and its resistance was measured.

[0010]

[Table 2] Dispersants, leveling agents, anti-settling agents, and defoamers were used as additives. Xylene, isobutyl alcohol, and butyl cellosolve are used as the main solvent mixture. As a mixed solvent of the curing agent, toluene, isobutyl alcohol, and butyl cellosolve were used. However, aromatic hydrocarbons, alcohols, ketones, esters,
Ether-based can be used. Dispersion method: Using a general coating disperser, a sand mill, a ball mill, or the like, to make primary particles of 20 μm or less. The colorant is made of an epoxy resin and a pigment. The pigment may be any of organic and inorganic pigments such as titanium oxide, carbon black, iron oxide (yellow, red), Shanin Blue, Shanin Green and the like. The finish upper layer is formed by two coats of 150 to 200 g / sq.m.

The resulting resistance value (Ω) is as follows.

[Table 3] The resistance was measured at a measurement distance of 600 mm and a voltage of 500 V. As a measuring instrument, 10 ⁸ Ω or less used SANWA 5501DM, and 10 ⁸ Ω or more used TOA SM-5E.

[0012] As apparent from the above results, A0, A1, A2 which use a conductive nickel undercoat layer, as compared to those using conductive zinc oxide B1, B2 or conductive tin oxide C2, 10 ⁶ I was able to be an extremely low resistance values of 10 ^7. This resistance value was also stable to changes in temperature and humidity.

In the above embodiment, the case where an epoxy resin is used as a synthetic resin vehicle has been described. However, an acrylic urethane resin, an acrylic resin, a polyurethane resin, a vinyl chloride resin, an alkyd resin, an unsaturated polyester resin, or the like is also used. be able to.

[0014]

According to the present invention described above: a The leakage resistance 10 shown in the electrostatic safety guidelines of the Ministry of Labor
^A resistance of ⁸ to 10 ¹¹ Ω or less is not affected by the temperature and the humidity, and has stability over time. b The layer forming material can be formed of concrete, mortar, the conductive coating layer excellent in practicability leakage resistance becomes less 10 ⁷ Omega even 0% moisture content by drying a slate plate. c Further, it is not practical in terms of smoothness and color by using only the undercoating conductive paint layer mixed with conductive nickel powder,
Then, conductive tin oxide powder or conductive zinc oxide powder of primary particles of 20 μ or less and a synthetic resin vehicle containing a coloring agent are mixed with conductive tin oxide powder or conductive zinc oxide powder / synthetic resin vehicle = 0. By mixing a conductive tin oxide powder or a conductive zinc oxide powder in a uniform state in a synthetic resin vehicle to form a top-coating conductive paint layer. It can also meet the requirements of smoothness and color, etc., conductive floor coating to prevent the occurrence of static electricity in operating rooms, computer rooms, and electronic component manufacturing factories such as LSIs, and rust prevention for power transmission towers. In addition to sign coating, it can be effectively used for devices requiring antistatic in petroleum refineries, chemical factories, paint factories, and the like.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location C09D 201/00 PDC C09D 201/00 PDC

Claims (1)

(57) [Claims] 1. A 50 to 150 and conductive nickel powder was secondary particles of μ and synthetic resin vehicle, conductive nickel powder
/ Combined mixed in a ratio of synthetic resin vehicle = 0.5-1.5,
Disperse conductive nickel powder uniformly in synthetic resin vehicle
Undercoat conductive paint formed by applying the conductive paint
On the layer, as topcoat conductive coating layer, and the conductive tin oxide powder or conductive zinc oxide powder of the following primary particles 20 [mu], and a synthetic resin vehicle containing colorants, conductive tin oxide powder or
Conductive zinc oxide powder / synthetic resin vehicle = 0.5-1.5
To synthesize conductive tin oxide powder or conductive zinc oxide powder
Apply conductive paint dispersed uniformly in resin vehicle
Conductive paint layer formed by