JPH08131936A - Waterproof coating method - Google Patents

Abstract

PURPOSE: To keep a waterproof effect for a long period of time by applying a sealer all over a base of an area to be waterproof-coated, adhering a pressure sensitive adhesive sheet on a sealer coating surface separately by interposing pressure sensitive adhesive sheet pieces, and then applying a waterproof coating material all over the area to be waterproof coated. CONSTITUTION: When the waterproof process is applied to a roof of a building or the like, a base of an area to be waterproof-coated is cleaned preliminarily, rust is removed, and cracks and the like are repaired, and then a sealer is applied all over the surface to be sealer coated. Then a sealer coated layer is dried sufficiently, and then a pressure sensitive adhesive sheet 1 with adhesive layer or layers formed on one or both faces are made to adhere separately to a sealer coated surface 4. At that time, the sheet 1 adhered separately is communicated with the sealer coated surface by interposing pressure sensitive adhesive sheet pieces 2. Air and gas such as water vapor or the like existing below the waterproof film all over the area to be waterproof coated are exhausted out of air vents 3 disposed properly on a peripheral edge section of the area to be waterproof-coated. Then a waterproof-coating material is applied to all over the area to be waterproof coated.

Description

Detailed Description of the Invention

[0001]

This invention relates to a waterproof coating method.

[0002]

2. Description of the Related Art A method of applying a waterproof coating is widely used as a waterproofing method for the concrete surface of roofs and walls of structures such as houses, shops, factories, warehouses, etc. Since the coating film cannot sufficiently follow the cracks, etc., the coating film cracks, and before the coating film is completely hardened immediately after coating, the water contained in the substrate evaporates and expands at elevated temperature. Therefore, there is a problem that foaming cracks occur everywhere in the coating film, and the waterproof effect by applying the waterproof coating cannot be maintained for a long time.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above problems and enables to maintain the waterproof effect by applying a waterproof coating for a long period of time. This was done in order to suppress the huge economic loss caused by the frequent occurrence of cracks.

[0004]

That is, according to the present invention, a sealer is applied to the entire surface of a base material for a waterproof coating area, and an adhesive sheet is attached to the sealer application surface in an isolated manner with an adhesive sheet piece interposed therebetween. The present invention relates to a waterproof coating method characterized by applying a waterproof coating to the entire area to be waterproof coated.

The present invention will be described below with reference to the accompanying drawings. FIG. 1 and FIG. 2 are schematic plan views showing a state in which a sealer is applied to the entire surface of a rectangular waterproof coating area substrate and an adhesive sheet is separately attached to the sealer application surface. In the case of the embodiment shown in FIG. 1, the adhesive sheet (1) is a sealer coated surface.
It is attached in parallel to (4). In the case of the embodiment shown in FIG. 2, the adhesive sheet (1) is attached to the sealer application surface (4) in a grid pattern.

A feature of the present invention is that a sealer is applied to a base material of a waterproof coating area and an adhesive sheet is applied to the sealer application surface (4).
(1) is adhered in an isolated manner with the adhesive sheet pieces (2), (2a), (2b) interposed therebetween, and then the waterproof coating material is applied to the entire area to be waterproof-coated.

After thoroughly preliminarily cleaning the waterproof coating area base, scooping off (cleaning) to repair cracks and the like indicated by dotted lines in FIGS. 1 and 2. The sealer is applied to the entire surface of the base material. The sealer is applied by brush coating, roller coating spray coating, or the like. The sealer may be appropriately selected and used from those known in the art depending on the type of the base material, the type of waterproof coating, etc., but the following commercially available solvent type sealers are particularly preferable. Included: "Concoat Sealer" (manufactured by Daiyu Paint Co., Ltd.), "Kaseira S" (manufactured by Kanae Kagaku Co., Ltd.), "Pulflon Primer" (manufactured by Nippon Special Paint Co., Ltd.), and "Polyflex PR" (Daiichi Kogyo Seiyaku Co., Ltd.) (Made by the company). The coating thickness of the sealer is not particularly limited, but it is generally 0.005 to 0.1 mm,
It is preferably 0.010 to 0.05 mm.

After the sealer coating layer is sufficiently dried, a pressure-sensitive adhesive sheet (1) having a pressure-sensitive adhesive layer on one side or both sides of the sealer-coated surface (4) is separately attached according to a preset layout. The form of sticking the adhesive sheet (1) in a separate manner is not particularly limited, but usually, the sticking sheets are stuck in parallel as shown in FIG. 1 or are stuck in a matrix form as shown in FIG. Let The form and size of the adhesive sheet (1) are
It may be appropriately selected in consideration of the waterproofing construction area and construction place, the state of the base material, the type of sealer, the type of waterproof paint, the coating film thickness, etc., but it is not particularly limited. In some cases, 20 cm x 40 cm to 50 cm x 150
cm rectangular adhesive sheet is generally used, and in the case of the form shown in FIG. 2, 20 cm × 20 cm to 150 cm
A square PSA sheet having a size of 150 cm is generally used.

The basic function of the pressure-sensitive adhesive sheet (1) is to prevent foaming damage to the coating film by providing a flow path for smoothly passing gas such as air and water vapor existing under the waterproof coating film. The purpose is to prevent the coating film from cracking by forming a local non-adhesive region in the waterproof coating film. Therefore, if the area of the pressure-sensitive adhesive sheet (1) is too small, it is difficult to obtain such effects, and conversely, if the area of the pressure-sensitive adhesive sheet (1) is too large, poor adhesion between the waterproof coating film and the substrate occurs. However, peeling and tensile deformation of the coating film are likely to occur.

The distance between the pressure-sensitive adhesive sheets (1) that are separately attached as described above may be appropriately selected in consideration of the above-described effects of the pressure-sensitive adhesive sheet (1), and is not particularly limited. However, for example, in the case of the mode shown in FIG.
15 to 30 cm, preferably 10 to 20 cm, and in the case of the embodiment shown in FIG. 2, 15 to 30 cm.
cm, preferably 10 to 20 cm.

The pressure-sensitive adhesive sheets (1) adhered in isolation are made to communicate with each other by interposing the pressure-sensitive adhesive sheet pieces (2). As a result, gas such as air and water vapor existing under the waterproof coating film on the entire waterproof coating area can be smoothly circulated. Such a circulating gas is exhausted from the deaeration holes (3) appropriately arranged at the peripheral edge of the waterproof coating area. Also,
The repaired crack (shown by the dotted line in FIGS. 1 and 2) should be covered with the adhesive sheet (1) or the adhesive sheet pieces (2a) and (2b). It is preferable to allow a large amount of gas such as air and water vapor to efficiently flow and to allow the free coating film to sufficiently follow the cracks. Since gas such as air and water vapor existing in the area where the sealer-coated surface and the waterproof coating are directly adhered to each other moves to the low-pressure adhesive sheet adhering area adjacent to the adhered area, the coating film is also applied in the adhered area. It does not cause foam damage or the like.

As the pressure-sensitive adhesive sheet, a commercially available pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer on one side or both sides may be appropriately used.
The base material of the adhesive sheet may be paper, cloth (woven cloth, non-woven cloth), plastic, or the like.

The entire waterproof coating area which has been subjected to the above-mentioned sealer coating treatment and adhesive sheet attaching treatment is coated with an intermediate coat and a top coat according to a conventional method. For the intermediate coating, "Water-based Helly Roof" (manufactured by Daiyu Paint Co., Ltd.), "Pluflon K10"
0 "(manufactured by Nippon Special Coating Co., Ltd.)," Non-tar coat SW "(manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and" Deck Urethane "(manufactured by Dainippon Ink and Chemicals, Inc.) and the like. Examples of the topcoat include "Fussotop" (manufactured by Daiyu Paint Co., Ltd.), "Pulfuron" (manufactured by Nippon Special Paint Co., Ltd.), and "Decktop" (manufactured by Dainippon Ink and Chemicals, Inc.). The coating thicknesses of the middle coat and the top coat are not particularly limited, but they are usually 0.5 mm to 5 mm and 0.03 mm to 0.1 mm, respectively.

[0014]

EXAMPLES The present invention will be described below with reference to examples. Example 1 A concrete rooftop (10 m × 6 m) of a building was thoroughly cleaned, scooped, and subjected to V-cuts for cracks, and then a sealer (“case sealer S”) was applied to the entire rooftop (application) Thickness: 0.015 mm). Then, according to the embodiment shown in FIG. 2, the adhesive sheet (1) and the adhesive sheet piece
[Adhesive sheet (1) in which (2), (2a) and (2b) are attached
Adhesion interval: 10 cm]. The size of the adhesive sheet (1) is 5
The size of the adhesive sheet pieces (2), (2a) and (2b) is 15 cm × 20 cm, 15 cm, respectively.
cm × 25 cm and 15 cm × 50 cm. As the pressure-sensitive adhesive sheet and the pressure-sensitive adhesive sheet piece, a single-sided pressure-sensitive adhesive sheet "VP-10" manufactured by Apex Co. was used. In addition, a deaeration hole (3) was provided in the peripheral portion of the roof. Next, the elastic water-based paint "Helly roof" was applied to the entire rooftop (application thickness: 2 mm), and after drying, the waterproof topcoat paint "Deck Top" was applied (application thickness: 0.015 mm). After 2 years, no crack or foam damage was observed in the waterproof coating film.

[0015]

EFFECTS OF THE INVENTION According to the present invention, gases such as air and water vapor existing under the waterproof coating film in the region where the adhesive sheet is adhered can be smoothly circulated and discharged to the outside of the system. Gases such as air and water vapor present in the area where the coating surface and the waterproof coating are in direct contact can be moved to the low pressure adhesive sheet adhering area adjacent to the contact area and discharged out of the system. No foam breakage of the membrane occurs. Further, in the area where the pressure-sensitive adhesive sheet is attached, the waterproof coating is not completely adhered and is in a free state, so that even if cracks etc. occur in the substrate, the coating as a whole can sufficiently follow this. Therefore, the coating film cracks do not occur (for example, in the case of the conventional method, when a crack having a width of about 0.5 mm occurs in the base material, the coating film cracks accompany the elastic paint,
In the case of the present invention, even if a crack having a width of 5 to 15 mm is generated, the waterproof coating film is not cracked. Further, the water contained in the base material is vaporized and expanded at a raised temperature. However, since it is buffered in the voids limited by the ground plane and the waterproof coating in the adhesive sheet adhering region, foaming damage of the coating does not occur.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a state in which a sealer is applied to the entire surface of a rectangular waterproof coating area substrate, and an adhesive sheet is separately and affixed to the sealer-applied surface according to an aspect of the present invention.

FIG. 2 is a schematic plan view showing a state in which a sealer is main-coated on the entire surface of a rectangular waterproof coating area substrate and an adhesive sheet is separately and adhesively adhered to the sealer-coated surface according to another embodiment of the present invention.

[Explanation of symbols]

 1 Adhesive sheet 2 Adhesive sheet piece 2a Adhesive sheet piece 2b Adhesive sheet piece 3 Deaeration hole 4 Sealer application surface

Claims (1)

[Claims] 1. A sealer is applied to the entire surface of the waterproof coating area base, and an adhesive sheet is adhered to the sealer application surface in an isolated manner with an adhesive sheet piece interposed, and then the entire waterproof coating area is waterproofed. A waterproof coating method characterized by applying paint.