JP2000282669A - Coated floor and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coated floor having a following property after the expansion/shrinkage of a concrete floor substrate by grinding/polishing/cleaning the concrete substrate, applying a primer excellent in adhesion and an adhesive property, an undercoat and an intermediate coat, then applying a urethane resin having an expansion property as a finish coat for finishing. SOLUTION: This coated floor is finished through a substrate process, primer coating, undercoating, intermediate coating, polishing/cleaning and finish coating. An epoxy resin or the like is used for the primer, undercoat and intermediate coat, and a conductive material is preferably added to the resin to apply conductivity. The surface of the hardened intermediate coat is ground/polished/cleaned by a polisher using an abrasive material, and the finish coat is applied. A urethane resin is used for the finish coat. The coated floor well follows after the expansion/shrinkage of a substrate, cracks hardly occur, and it is excellent in shock resistance. Since it is blended with the conductive material, it is excellent in antistatic performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated floor, and more particularly to a coated floor used in a clean room or the like where a high degree of cleanliness is required, and a method of applying the same.

[0002]

2. Description of the Related Art Clean rooms requiring a high degree of cleanliness include production and development factories for electronic components and the like, prototype rooms,
Widely used in various business establishments. For example, semiconductor factories are used in the entire factory, and in recent years, the requirements for anti-static functions and the like in addition to the cleanliness level have been increasingly improved. In addition, it is necessary to exclude various materials and chemicals used indoors from affecting the process. Conventionally, floors coated with epoxy resin, which is excellent in chemical resistance, water resistance, abrasion resistance, etc., have been used for coating floors in factories. Cracks could not be made, and needed to be constantly repaired. In recent years, the density of electronic components, especially in the field of semiconductors, has been increasing, and in certain resist materials used to realize fine patterns, ammonia gas has an adverse effect on circuit pattern formation, resulting in poor quality due to malfunction. There are many cases that cause this. However, since an epoxy resin uses an amine-based curing agent, generation of ammonia gas is unavoidable, and it has been impossible to use the epoxy resin. In addition, the business floor of the electronic parts naturally needs an antistatic function, so that a coated floor having appropriate performance has been required.

[0003]

SUMMARY OF THE INVENTION The present invention provides the above-mentioned object,
That is, it is an object of the present invention to provide a coated floor that has the ability to follow the expansion and contraction of a concrete floor foundation, has antistatic performance, and does not adversely affect the work process of electronic components and the like.

[0004]

The present invention has been made as a result of studying to solve the above-mentioned problems, and will be described in detail below. The coating floor according to the present invention is a base treatment, a primer coating, an undercoat, an intermediate coating, polishing and cleaning,
Finished through the overcoating stage. Usually, on the first day, the operations (1), (2), and on the third day are performed.

[0005] The undercoating is performed by sanding with a polisher using sandpaper # 40 or the like to clean the concrete surface.

As the primer, an epoxy resin, a urethane resin, a polyester resin, or the like can be used. Preferably, an epoxy resin having excellent adhesion to a base is used. The work with a roller bucket is suitable for applying the primer.

[0007] As with the primer, an epoxy resin, a urethane resin, a polyester resin, or the like can be used as in the case of the primer. In addition, a filler may be added to the undercoating agent as needed in order to secure a coating amount. The undercoating work is suitable for ironing.

For the intermediate coating, an epoxy resin, a urethane resin, a polyester resin, or the like can be used, but an epoxy resin is suitable from the viewpoint of adhesion and adhesion to a base. It is desirable to add a conductive material to the resin in order to impart conductivity. The conductive material is carbon graphite,
There are carbon fibers, metal powders, conductive metal oxides, and the like, and the amount to be added is selected according to the surface conductivity level. Further, it may be applied while impregnating a cloth or mat of carbon fiber with the above resin. The method of roller coating or ironing is suitable for the intermediate coating operation.

[0009] Sandpaper #
Polish with a polisher using an abrasive of about 80 and apply a top coat. For the overcoat, a urethane-based resin, especially a combination of a polyester polyol and methylene diisocyanate, is suitable because of good strength and chemical resistance. It is necessary to mix conductive materials in the resin, for example, carbon fiber,
Preferably, a white or colorless material such as carbon graphite, zinc oxide, and calcium titanate is used to secure the selectivity of the color tone of the floor surface. The addition amount differs depending on the conductive material and the required level, and an addition amount that secures about 5 × 10Ω ⁵ to 1 × 10Ω ⁵ is selected. It should be noted that the application of the overcoat is suitable for finishing with an iron.

Hereinafter, the present invention will be further described with reference to Examples and Comparative Examples.

EXAMPLE After the casting, the surface of the concrete 25 days later was sanded with a polisher equipped with sandpaper # 40 to make it smooth, and then the abrasive was suctioned off with a cleaner to remove the ground. Subsequently, 0.2 kg / m ^{2 of} Aikapur JJ-11 (epoxy resin / solvent) was applied as a primer with a roller bucket. Furthermore, 0.5 kg / m ^{2 of} Aikapur JJ-12 (epoxy resin) was applied as an undercoat using a trowel. Thus, the construction work on the first day has been completed.

On the surface of the cured undercoat, 0.2% of Aikapur JJ-160 (30% by weight of carbon graphite added as a conductive material to an epoxy resin) was applied as an intermediate coat.
It was applied and cured with a kg / m ² roller bucket. This completes the construction work on the second day.

After the surface of the cured intermediate coating layer is polished and cleaned using a sandpaper # 80 or the like, Aikapur JJ-165 (polyester polyol / methylene diisocyanate urethane resin, zinc oxide as a conductive material at 30 wt. % Added) with iron for 1.0k
g / m ^{2 was} applied and cured to finish the overcoat layer. The construction work on the third day has been completed. The performances of the coated floor finished in the above examples are as shown in the table.

(Comparative Example) Joliace JE-25 was used in place of Aikapur JJ-165 of the top coat in the embodiment.
Coating floors of Comparative Examples were finished in the same manner except that 65 (a material obtained by adding 30% by weight of zinc oxide as a conductive material to an epoxy resin) was applied and cured under the same conditions.
The various performances are as shown in the table.

[0014]

[Table 1]

Measurement method Conductivity: Two electrodes are placed on the floor at an interval of 91.4 cm, and the electric resistance when 500 V is applied between the electrodes is measured. 2. Impact resistance: A 1.8 kg steel ball is dropped from the height of 80 cm to the same place to check the abnormal condition of the floor. 3. Abrasion resistance: The amount of wear (g) per thousand rotations is measured according to JIS K7204 “How to Test Plastic Wear with Wear Wheels”. 4. Elongation: Elongation (%) is measured according to JIS K6911 “General method for thermosetting plastics test”. 5. Hardness: Hardness (Shore D hardness) is measured according to JIS K7215 “Durometer hardness test method for plastics”. 6. Concrete bond strength: According to JIS K6909 "Test method for phenolic resin for grinding", bond strength (N /
mm ² ). 7. Ammonia gas: A coating film obtained by applying and curing Aikapure JJ-165 used in Examples and Joliace JE-2565 used in Comparative Examples on release paper, respectively. A U-shaped glass tube containing a specimen from which each coating film was peeled was placed in an oil bath, one of the glass tubes was connected to a nitrogen gas cylinder, and the other was connected to water in a sample bottle containing pure water. Then, using a device that sucks from the top of the sample bottle, set the oil bath to each temperature, leave it for 30 minutes, then suck and absorb the gas that evaporates from the sample into the water in the sample bottle, and then use the ion chromatograph. Quantitative analysis (n-gram unit) per 1 gram of the test piece is carried out for ammonia gas.

[0016]

The coated floor according to the present invention is a primer which is excellent in adhesion and adhesion after a concrete base is cleaned.
After the undercoat and the middle coat are applied, the top coat is finished by applying a stretchable urethane resin.
It follows the expansion and contraction of the substrate well, hardly causes cracks, and has excellent impact resistance. In addition, since it contains a conductive material, it is excellent in antistatic performance, and is the most preferable finishing material for floors of business places where charging of electronic parts and the like is not desired. Moreover, in recent years, there is no release of ammonia gas or the like, which has an adverse effect on a resist material used for forming a circuit, which is a problem in a semiconductor factory.

Claims (2)

[Claims] After a concrete base is cleaned, a primer containing an epoxy-based, urethane-based or polyester-based resin, an undercoat and an intermediate coat containing a conductive material are sequentially applied, and then a urethane resin containing a conductive material is applied. A method of applying a coated floor, characterized by applying and finishing an overcoating material consisting of: 2. A primer containing an epoxy-based, urethane-based or polyester-based resin, an undercoat and an intermediate coat containing a conductive material are formed on a concrete base, and an overcoat material made of a urethane resin containing a conductive material is applied. A coated floor characterized by being finished.