JPH07269041A - Composite waterproof method composed of perforated rubber sheet and coated film - Google Patents

Abstract

PURPOSE:To prevent blistering or the like, by a method wherein a perforated rubber sheet to each of which surfaces a nonwoven fabric is adhered is layered on roof backing through an adhesive or a waterproofer and a water resistant layer having a film coated with urethane is layered on this sheet. CONSTITUTION:A perforated rubber sheet with a thickness of 0.2 to 3.0mm to each of which surfaces a nonwoven polyester fabric is adhered is molded. Holes on this sheet each are set to a diameter of 20mm or less and the number of the holes is set to 50 or more a square meter. This sheet is layered on roof backing through an urethane adhesive, and while the holes are being filled with urethane, a water resistant layer having a film coated with the urethane is layered on the perforated rubber sheet. Therefore, an excellent waterproofer having the film coated with the urethane can be formed, on which peeling-off or blistering does not occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of exposing and waterproofing a composite coating film for applications requiring waterproofing such as rooftops, balconies, balconies and open corridors of buildings.

[0002]

2. Description of the Related Art Conventionally, as an exposure waterproofing method used in the above fields, a sheet in which a synthetic polymer roofing sheet such as rubber, vinyl chloride resin or ethylene vinyl acetate resin is attached to the surface of a concrete skeleton with an adhesive agent Waterproofing and coating waterproofing by mixing and applying a two-component urethane rubber-based waterproofing material on site are available.

However, all of them have advantages and disadvantages, and they are very easy to work as compared with the asphalt waterproofing thermal method, but in the case of sheet waterproofing, the watertightness at the joint is not reliable, and particularly the complicated shape is used. There is a lot of water leakage at the joints of the parts. On the other hand, with the waterproof coating, the waterproof layer can be finished seamlessly without any joints, but it was not possible to easily determine on the site whether the specified film thickness could be ensured uniformly.

That is, in waterproofing the sheet, since the sheet is formed into a prescribed shape, the desired film thickness can be secured from the beginning by simply joining the pieces on site, and the waterproof layer can be formed without the curing and curing period. . However, since the sheets are attached to each other by using a chloroprene rubber-based adhesive, a butyl rubber-based adhesive or a welding agent at the joint, the watertightness may be deteriorated due to the deterioration of the adhesive, the temperature change, and the displacement due to the movement of the base material for a long time. It wasn't always perfect. In addition, the adhesion of the sheet to the surface of the concrete skeleton was affected by many factors such as improper adjustment of the undercoat, insufficient mixing of the adhesive, insufficient amount of application, and timing error of the bonding, and adhesion failure was likely to occur.

In coating film waterproofing, the two liquids are mixed and stirred on site and applied with a trowel or the like, so there is no joint like sheet waterproofing, and a totally waterproof layer of one piece can be formed, while reacting and curing. Since it forms a film, it has excellent adhesion to the base,
It was unclear whether the film thickness could be ensured even if a prescribed amount of the waterproof material was applied so as to obtain a desired film thickness due to the unevenness and the gradient of the base.

[0006]

Therefore, in order to compensate for both of these drawbacks, the composite construction method in which the sheet and the urethane coating film are laminated in a double layer is the watertightness because the joint portion of the sheet is covered with the urethane coating film to be laminated. Since a urethane coating film having an improved coating thickness and an unstable coating thickness is assisted by a sheet having a secured film thickness, a safer and more reliable waterproof layer can be formed.
This sheet may be a homogeneous sheet such as a rubber asphalt sheet or a vulcanized rubber sheet, or a composite sheet obtained by impregnating and coating asphalt on a polyester nonwoven fabric.

However, even with these methods, the problem of poor adhesion between the sheet and the base cannot be solved by the homogeneous sheet, and the deterioration of the adhesive and the repeated movement of the base cause partial peeling and swelling. In addition, the composite sheet was not compatible with the urethane waterproof material and it was difficult to bond the composite sheet.

Further, the adhesion construction method in which such a sheet is entirely adhered to the base not only has insufficient followability to cracks in the base and movements of joints, but the moisture contained in the base becomes steam due to an increase in temperature, The pressure may cause peeling in places where the waterproof sheet has poor adhesion. Especially when a slab with concrete placed on the deck plate is used as a waterproof base or a waterproof layer on young concrete is used, or immediately after construction, the moisture in the concrete becomes water vapor due to heat during construction or heat from direct sunlight, The waterproof layer often pushes up locally and swells.

[0009]

The present invention is the following invention which has solved the above problems. That is, the composite waterproofing method is characterized in that a perforated rubber sheet having a nonwoven fabric adhered on both sides thereof is laminated on an underlayer through an adhesive or a waterproof material, and a urethane coating film waterproof layer is laminated on the laminated waterproof sheet.

The present invention will be described in detail below. The material of the perforated rubber sheet used in the present invention is not particularly limited,
There are rubbers such as ethylene / propylene rubber, ethylene / propylene / diene monomer (hereinafter abbreviated as EPDM), vulcanized butyl rubber, non-vulcanized butyl rubber, and chlorosulfonated polyethylene. These rubber sheets can be used alone if they have no pores. Those having sufficient waterproofness are preferable.

The shape of the holes of the perforated rubber sheet has a hole diameter of 5 to 2
It is preferably 0 mm and the number of holes is 50 to 5,000 / m ² . For example, a hole with a hole diameter of 10 mm is 50 mm x 25 m
An EPDM sheet having about 800 pieces / m ^{2 in} a lattice of m is included.

The perforated rubber sheet is adhered to the base with an adhesive or a waterproof material, and a waterproof material is further laminated on the perforated rubber sheet to close the holes to maintain waterproofness. The close contact allows the movement of the rubber sheet to be reliably suppressed. If the thickness of the perforated rubber sheet is less than 0.2 mm, the strength of the sheet itself tends to be insufficient, and since the specified film thickness secured from the beginning is thin, the reliability of waterproofness becomes poor, and exceeds 3.0 mm. And it becomes difficult for the urethane waterproof material laminated on top to fill the holes. Therefore, the thickness of the perforated rubber sheet is preferably 0.2 to 3.0 mm, more preferably 1 to 2 mm.

As the role of the non-woven fabric attached to the perforated rubber sheet, the upper surface is for the purpose of further improving the adhesiveness with the urethane waterproof layer, and the lower surface is the ventilation layer for excluding the underlying moisture.

Therefore, the basis weight of each of the non-woven fabrics is not particularly limited, but the upper surface is 50 to 200 g / m ² ,
The lower surface is preferably 100 to 300 g / m ² . The material may be polyester, polyethylene, nylon, vinylon, etc., but polyester is preferable from the viewpoint of adhesiveness and cost.

As a method for attaching the non-woven fabric to the perforated rubber sheet, there is a method such as heat fusion, vulcanization fusion, or an adhesive method.

The adhesive or waterproof material used for sticking the perforated rubber sheet cloth to the substrate is not particularly limited to urethane adhesive, epoxy adhesive, urethane waterproof material, etc. Urethane adhesives are preferred.

As the material of the waterproof layer used in the present invention, a known polyurethane coating waterproof material system is preferable, and more preferable is a roof coating waterproof material JIS A 6021.
It is to use a urethane coating film waterproof material having a performance that passes the urethane rubber type 1 standard. Further, when the urethane waterproof material is applied, the applied film thickness is usually preferably 2 to 5 mm.

As described above, according to the method of the present invention, a perforated rubber sheet having a thickness of 0.2 to 3.0 mm and having a non-woven fabric attached on both sides thereof is adhered with an adhesive or a waterproof material, and a urethane coating film is applied thereon. Since a waterproof layer is laminated, it is waterproof with a double film thickness, which makes up for both shortcomings and maximizes the advantages of both to make possible a safer, more durable and more reliable waterproof waterproof construction. . In addition, moisture up from the base is excluded through the non-woven fabric layer laminated on the lower surface of the perforated rubber sheet, and the urethane waterproof material firmly adheres to the base through the holes of the perforated rubber sheet, so the adhesiveness of the entire waterproof layer system is improved. It is extremely good and does not cause peeling or partial blistering for a long period of time.

The composite waterproofing method of the present invention can be applied to the surface of a building or the like.

[0020]

EXAMPLES The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples.

Example 1 A urethane type two-component adhesive was applied to a concrete panel at 0.25 kg / m ² . 100 g / m ^{2 on} the upper surface of a 1.0 mm thick EPDM sheet,
50 mm × 50 mm holes with a hole diameter of 10 mm on a laminated sheet with a polyester non-woven fabric of 200 g / m ² attached to the lower surface with an adhesive.
Perforated E made by opening about 800 pieces / m ^{2 in a} 25 mm grid pattern
A PDM sheet was stuck on it, and 2.0 kg / m ^{2 of} urethane-based two-component waterproofing material was applied from above, while closing the holes. Furthermore, urethane type 2 liquid waterproof material is 2.0 kg / m
^{2 was} applied to form a composite waterproof layer. Finally, 0.2 kg / m ² of acrylic urethane type two-component top coat was applied to obtain a urethane composite coating layer.

Example 2 A urethane type two-component adhesive was applied to a concrete panel at 0.25 kg / m ² . Thickness 1. 100 g / m ² on the upper surface of the chlorosulfonated polyethylene sheets 2 mm, about the laminated sheet obtained by heat fusion polyester nonwoven 200 g / m ² on the lower surface of the pores with a pore diameter of 10mm to 50 mm × 25 mm like lattice 800 A perforated EPDM sheet formed by opening individual pieces / m ² was applied, and 2.0 kg / m ^{2 of} a urethane-based two-component waterproof material was applied thereon while closing the holes. In addition, 2.0 kg / m ^{2 of} urethane-based two-component waterproof material
It was applied to form a composite waterproof layer. Finally, 0.2 kg / m ² of acrylic urethane type two-component top coat was applied to obtain a urethane composite coating layer.

Comparative Example 1 A concrete panel was coated with 0.2 kg / m ² of a chloroprene rubber adhesive. A 1.8 mm thick polymer-modified asphalt sheet mixed with a styrene-butadiene copolymer was applied. A urethane-based two-component waterproofing material was applied thereonto at 3.0 kg / m ² to form a waterproofing layer. Finally, 0.2 kg / m ² of acrylic urethane two-component top coat was applied to obtain a urethane coating layer.

(Comparative Example 2) A chloroprene rubber adhesive of 0.2 kg / m ^{2 was} applied to a concrete panel, and a polyester non-woven fabric was impregnated with polymer modified asphalt as a core material and coated with 2.0 mm thick styrene-butadiene.
A sheet of mixed copolymer was applied. A urethane-based two-component waterproofing material was applied thereonto at 3.0 kg / m ² to form a waterproofing layer. Finally, 0.2 kg / m ² of acrylic urethane two-component top coat was applied to obtain a urethane coating layer.

[Evaluation] Evaluation was performed according to the following method, and the results are shown in Table 1.

<Interlayer adhesion> Using the test pieces of the concrete panels obtained in Examples and Comparative Examples, the adhesion strength (unit: kg / m ² ) was measured and the peeling state was observed by the Kenken type test method. went.

<Blistering test> A hole of 10 mmφ penetrating through the center of a concrete plate for sidewalks of 60 mm thickness × 300 mm width × 300 mm length is formed in the center, 40 mmφ release paper is provided, and a composite waterproof layer is applied on it, and 60 ° C. In this state, a pressure of 1 kg / m ² was applied from the hole on the back surface for 1 hour, and abnormalities in the expansion of the insulating portion of the release paper were observed.

<Breathability> As shown in FIG. 1, length (L)
Of the asbestos slate plate having a dimension of 1,200 mm and a width (W) of 600 mm was used as the base 21 to form each coating film to prepare the test body 1. The coating has a length (l) of 10
It was formed to have a size of 00 mm and a width (w) of 500 mm (this was designated as Specimen 2). Next, the test apparatus 8 as shown in FIG. 2 was attached to the test body 1, and 10 mmAq of pressure air was sent from the air feed port of the test body, and the outflow air amount (unit: ml / min) was read by the minute flow meter. Outflow amount is 1
There is an example that the blistering of the waterproof layer does not occur in the system of 70 ml / min or more.

[0029]

[Table 1]

[0030]

EFFECTS OF THE INVENTION The perforated rubber sheet to which a non-woven fabric is adhered according to the present invention is further utilized to further take advantage of the waterproofness of the urethane coating film, and the adhesiveness to the base, the adhesiveness to the urethane waterproof layer, and the moisture from the base. Partial peeling by pushing up,
It is possible to provide an excellent urethane coating film composite waterproof material that does not swell.

Compared with the asphalt waterproof thermal method, the workability is very simple, and since the urethane waterproof material can be applied on the perforated rubber sheet, it is easy to secure the specified film thickness more uniformly,
Furthermore, the waterproofness of the rubber sheet and the double thickness of the rubber sheet enables a composite waterproofing method that is safer, more durable, and more reliable in terms of waterproofness.

[Brief description of drawings]

FIG. 1A is a plan view of a test body used for a breathability test in an example, and FIG. 1B is a front view of a test body used for a breathability test in an example.

FIG. 2 (B) is a schematic view of a test apparatus used for the air permeability test in the example.

[Explanation of symbols]

 1: Specimen 2: Specimen 3: Air supply port 4: Air supply groove 5: Full adhesion part 6: Sealing treated part 7: Sealing untreated part 8: Test equipment 9: Pressure gauge 10: Micro flow meter 11: Pressure regulator 12: Pressure reducing valve 13: Pressure cylinder 21: Base

Claims (5)

[Claims] 1. A composite waterproofing method comprising laminating a perforated rubber sheet having a non-woven fabric adhered on both sides to an underlayer via an adhesive or a waterproof material, and laminating a urethane coating film waterproof layer thereon. . 2. A perforated rubber sheet having a thickness of 0.2 to 3.0 m.
The composite waterproofing method according to claim 1, which is a perforated rubber sheet in which a nonwoven fabric is attached to both sides of the rubber sheet of m. 3. The composite waterproofing method according to claim 1 or 2, wherein the perforated rubber sheet has a hole diameter of 20 mm or less and a number of holes of 50 / m ² or more. 4. The perforated rubber sheet is a laminated body in which a non-woven fabric is adhered to both sides of the rubber sheet by heat fusion, vulcanization fusion, or an adhesive, claim 1, claim 2, or claim 3. Composite waterproofing method. 5. The composite waterproofing method according to claim 1, wherein the nonwoven fabric layer on the lower surface of the perforated rubber sheet forms a ventilation layer.