JPH0139303Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an intermediate sheet for painted urethane resin floors, and more specifically to an intermediate sheet for improving the blistering prevention etc. of painted urethane resin floors. .

(Prior Art) In recent years, in tennis courts, sports fields, etc., urethane resin floors have been painted directly on concrete surfaces, and urethane resin has been painted on rooftops to make them waterproof. For these coated urethane resin floors, 3 to 4 coats of urethane resin are applied to give cushioning properties to the floor.
It has to be repeated several times and requires a lot of time and effort.

In addition, since the urethane resin layer is formed directly on the concrete surface, when the water in the concrete expands and turns into water vapor due to the outside temperature, there is no place for the generated water vapor to escape.
This may cause separation between the concrete surface and the painted urethane resin layer, causing unevenness on the floor surface.Furthermore, if the concrete cracks, the urethane layer will also crack, and it will no longer function as a waterproofing agent. There is.

As described above, applying urethane resin coating directly to the concrete surface causes various problems, so it has become common to apply urethane resin coating by interposing some kind of sheet between the concrete surface and the urethane resin coating surface. For example, urethane waterproofing using a laminated sheet as described in Japanese Utility Model Application Publication No. 55-41449 is known.

The laminated sheet used here consists of a foam sheet, a fiber material, and an adhesive layer laminated in this order.In use, the foam sheet side is layered with an adhesive and a primer layer. After adhering to a concrete floor or the like, a urethane resin or the like is applied to the surface of the adhesive layer to make it waterproof.

(Problem to be solved by the invention) However, in this type of laminated sheet, in order to apply a resin such as urethane to the surface of the adhesive layer impregnated into the fiber material, the applied resin passes through the adhesive layer. There is a problem in that the foam permeates the fiber material layer and even the foam sheet and hardens within this layer, deteriorating the breathability and cushioning properties of the foam sheet. Furthermore, depending on the adhesive impregnated into the fiber material layer, there is a problem that the urethane coating surface may peel off.

(Means for Solving the Problems) As a result of researching this type of intermediate sheet that eliminates the above-mentioned drawbacks and can be easily manufactured, the present inventor has developed a method in which concave grooves, such as a checkerboard pattern, are provided on one side. A polyethylene or polypropylene film that has been subjected to corona discharge treatment on one side is placed on the side of the polyethylene or polypropylene foam that is not provided with grooves, and the corona discharge treated side of the polyethylene or polypropylene film is the outer side. A base sheet is composed of laminated sheets pasted together in such a manner that the corona discharge treated surface of the polyethylene or polypropylene film in the base sheet is coated with a thermoplastic synthetic resin that has adhesion performance to the painted urethane resin. By using a sheet with a coated synthetic resin layer as an intermediate sheet for painted urethane resin floors, the coating has excellent cushioning properties, does not cause unevenness, and can prevent cracks in the urethane layer even when cracks in concrete occur. It was discovered that a urethane resin floor could be obtained by simple construction operations, and the present invention was completed based on this knowledge.

In other words, the gist of the present invention is to use polyethylene with grooves such as a checkerboard pattern formed on one side, or polyethylene with corona discharge treatment applied to one side of the polypropylene foam on the side where grooves are not provided. Alternatively, the base sheet is constituted by a laminated sheet in which polypropylene films are laminated together such that the corona discharge treated surface of the polyethylene or polypropylene film becomes the outer surface, and the polyethylene or polypropylene film in the base sheet is subjected to corona discharge treatment. This is an intermediate sheet for a painted urethane resin floor, characterized in that a covering synthetic resin layer made of a thermoplastic synthetic resin having adhesive properties to the painted urethane resin is provided on the surface.

(Example) Hereinafter, the specific structure of an example of the intermediate sheet for painted urethane resin floors of the present invention will be described with reference to the drawings.

In FIG. 1, an intermediate sheet 1 for a coated urethane resin floor, which is an embodiment of the present invention, is made of a foam 2 having relatively thick checkerboard grooves 7 on one side.
A polyethylene or polypropylene film 4 that has been subjected to a corona discharge treatment to firmly adhere to the coating synthetic resin layer 6 is placed on the side where the grooves are not provided, and a corona discharge treatment surface 3 of the polyethylene or polypropylene film 4 is A base sheet 5 composed of laminated sheets bonded together so as to form an outer surface, and a covering synthetic resin layer 6 formed on the corona discharge treated surface 3 of the polyethylene or polypropylene film 4 in the base sheet 5. It consists of

Intermediate sheet 1 for painted urethane resin floors of the present invention
In this case, the foam 2 provided with the checkerboard-shaped grooves 7 on one side provides appropriate cushioning properties to the resulting coated urethane resin floor, and also acts as a passageway for water vapor generated from the concrete floor surface. Therefore, a foam layer with a thickness of usually about 2 to 20 mm is used, which is obtained by using a foam made of polypropylene or polyethylene, which is stable against the alkalis of concrete. be able to. Here, the foaming state of the foam, that is, the expansion ratio, whether the cells in the foam are single cells or open cells, etc., can be appropriately selected according to desire. Furthermore, the groove 7 provided on one side of the foam body 2 serves as a passage for water in the concrete to become water vapor after construction, and is provided in the shape as illustrated in Figs. 3 and 4. It is. The depth of the groove 7 is suitably 1 to 5 mm. Further, the width and interval of the grooves 7 may be determined by taking into consideration the shape of the grooves such as a checkerboard pattern, the hardness of the foam, and the like.

Accordingly, in the present invention, the polyethylene or polypropylene film 4 has a filling effect that prevents the coating urethane resin formed on the upper surface of the intermediate sheet 1 using the foam 2 from penetrating into the foam 2. Normally 20~200μ
It is sufficient if it is formed to a certain thickness. The polyethylene or polypropylene film 4 in the intermediate sheet 1 can be formed by extrusion coating a polyethylene resin or polypropylene resin onto the surface of the foam 2, or by interposing a separate polyethylene or polypropylene film with a suitable adhesive. 2, or by directly heat-sealing a separate polyethylene or polypropylene film onto the surface of the foam 2.
The polyethylene or polypropylene film 4 is made of polyethylene or polypropylene so that the presence of the polyethylene or polypropylene film 4 does not have an adverse effect on the coated urethane resin layer formed on the upper surface of the intermediate sheet 1. Preferably, the film 4 does not contain additives such as slip agents and antistatic agents.

The covering synthetic resin layer 6 in the intermediate sheet 1 of the present invention is composed of the intermediate sheet 1 of the present invention and the intermediate sheet 1.
It is used to increase the adhesive strength between the coating urethane resin layer formed on the top surface, and is a thermoplastic synthetic resin that has adhesive properties to the coating urethane resin, such as urethane-based, polyester-based, polyethyleneimine-based, etc. It is formed on the corona discharge treated surface 3 of the above-mentioned polyethylene or polypropylene film 4 to a thickness of about 0.01 to 5 μm using synthetic resin. This coating synthetic resin layer 6,
The laminated structure of the polyethylene or polypropylene film 4 and the foam 2 is such that, for example, a coating synthetic resin layer 6 is formed by a synthetic resin coating method on the corona discharge treated surface of a polyethylene or polypropylene film whose surface has been subjected to corona discharge treatment. Paste the coated film with foam 2, or
Alternatively, it may be formed by forming a coating synthetic resin layer 6 on the surface of the polyethylene or polypropylene film of a laminated sheet of the foam 2 and the polyethylene or polypropylene film 4.

As shown in FIG. 2, the intermediate sheet 1 of the present invention having the above-mentioned structure is placed on the upper surface 9 of the existing concrete floor 8 with the foam 2 side of the intermediate sheet 1 facing the adhesive 10. After the layers are laminated together, a painted urethane resin layer 11 is formed on the covering synthetic resin layer 6, which is the upper surface of the intermediate sheet 1, and a painted urethane resin floor is completed.

(Effect of the invention) The intermediate sheet of the invention has a polyethylene or polypropylene film layer that prevents the urethane resin to be coated from penetrating into the polyethylene or polypropylene foam, so the urethane resin hardens within the foam. The bubble shape of the foam is maintained, and the painted urethane resin floor does not lose its breathability and cushioning properties. Furthermore, the urethane resin to be painted is laminated to the corona discharge treated surface of the polyethylene or polypropylene film via a synthetic resin layer that is coated with a thermoplastic synthetic resin layer that has extremely good adhesion to the urethane resin, so that surface peeling does not occur. You won't have to do anything. Furthermore, since the layer for preventing penetration of the urethane resin that is laminated onto the polyethylene or polypropylene foam is a polyethylene or polypropylene film, it can be easily laminated onto the polyethylene or polypropylene foam by various methods. I can do it.

Furthermore, when constructing a painted urethane resin floor using the intermediate sheet of the present invention, all that is required is to drill a small hole at the edge of the painted urethane resin floor that penetrates the painted urethane resin layer and the intermediate sheet. Since the water vapor generated from within the concrete is dissipated through the concave grooves 7 of the foam in the intermediate sheet, peeling of the painted urethane resin layer due to the water vapor generated from within the concrete is suppressed, and the painted urethane resin floor surface is prevented from peeling. It also has the effect of preventing unevenness from occurring.

[Brief explanation of the drawing]

Figure 1 is a schematic vertical cross-sectional view showing an example of the intermediate sheet for painted urethane resin floors of the present invention, and Figure 2 is a painted urethane resin floor constructed using the intermediate sheet shown in Figure 1. FIG. 3 is a schematic longitudinal cross-sectional view showing an example of the foam, and FIGS. 3 and 4 are perspective views showing examples of grooves in the foam. 1... Intermediate sheet of painted urethane resin floor, 2...
...Foam material with checkerboard grooves on one side, 4...
Polyethylene or polypropylene film whose surface 3 has been subjected to corona discharge treatment, 5... Base sheet of intermediate sheet, 6... Covering synthetic resin layer made of thermoplastic synthetic resin, 7... Concave groove of foam, 8...
...Concrete, 11...Painted urethane resin layer.

Claims (1)

[Scope of utility model registration request] A polyethylene or polypropylene foam with corona discharge treatment on one side is placed on the non-groove side of a polyethylene or polypropylene foam with checkerboard grooves on one side. The base sheet is composed of a laminated sheet of polypropylene film laminated with the corona discharge treated surface facing the outer surface, and the corona discharge treated surface of the polyethylene or polypropylene film in the base sheet is coated with urethane resin. 1. An intermediate sheet for painted urethane resin flooring, characterized in that it is provided with a covering synthetic resin layer made of a thermoplastic synthetic resin that has adhesive properties.