JPH08338107A - Composite waterproof sheet and coating film waterproof construction - Google Patents

Abstract

PURPOSE: To provide a composite waterproof sheet of high reliability by providing an upper layer side nonwoven fabric on an upper layer side of a vulcanized rubber sheet and a lower layer side nonwoven fabric on a lower layer side by fusion. CONSTITUTION: By fusing a polyester fiber non-woven fabric layer 1 consisting of polar fiber on a vulcanized rubber sheet layer 2 as an upper layer non-woven fabric layer, it is possible to strongly adhere a coating film waterproof paint as it permeates among the fiber, when it is applied on an upper layer of this polyester fiber nonwoven fabric layer 1 and additionally possible to strongly adhere it as chemical binding of a polar group of the polyester fiber nonwoven fabric layer 1 and a polar group of the film waterproof layer is added. Additionally, air permeability and a cushioning property are provided when a non-polar polypropylene fiber nonwoven fabric layer 3 which is a lower layer side nonwoven fabric layer is integrally fused under the vulcanized rubber sheet layer 2, and consequently, it is possible to effectively protect the vulcanized rubber sheet layer 2 from water and to guarantee an adhesive property of a frame body surface and a composite waterproof sheet even when moisture exists on the frame body surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite waterproof sheet and a waterproof coating construction.

[0002]

2. Description of the Related Art In recent years, the roof surface of a building is generally waterproofed.

This type of waterproof construction is roughly classified into three types: asphalt construction, sheet construction and coating construction.

In asphalt construction, asphalt that has been melted at high temperature is constructed on the running surface. This asphalt construction has the advantages that the work can be done quickly and the cost can be reduced. However, this method has drawbacks such as a risk of fire occurrence during construction, bad odor emission, bad weather resistance after construction, bad low temperature embrittlement cracking property, and inability to reduce construction thickness.

On the other hand, in the sheet construction, a rubber sheet or a plastic sheet is constructed on the running surface. Since this sheet construction uses a rubber sheet or a plastic sheet, there is an advantage that the construction thickness can be made thin and the weather resistance is excellent. However, this method has a drawback in that the cost of the sheet material is high and the size of the precursor surface is larger than the dimension of the sheet material produced in the factory, so that the number of sheet connecting works is large.

On the other hand, coating is a method of forming a waterproof coating by thinly applying a waterproof coating on the surface of the vehicle body. This coating film construction has an advantage that the construction thickness can be made thin and the sheet connection construction can be omitted since the coating film is used. However, the organic solvent-type waterproof paint has a risk of fire occurrence during construction, and the water-dispersed waterproof paint has poor drying properties during construction and the water resistance and weather resistance of the coating film after construction are inferior. There is.

On the other hand, as a waterproof coating film, there has been put to practical use a waterproof coating material which has no risk of fire, has good drying property during construction, and has excellent water resistance and weather resistance after construction. For this reason, the conventional problems of waterproofing the coating film will be solved.

For example, coating film application using a solvent-free polyurethane waterproof paint has the advantages that the installation thickness can be reduced and the sheet connection work can be omitted, and that the installation can be performed at room temperature. Therefore, there is no risk of fire or bad odor like during high-temperature asphalt construction, and there are no problems such as bad weather resistance, bad low-temperature embrittlement crackability, and inability to reduce construction thickness, which cannot be avoided in asphalt construction. .

For this reason, the polyurethane coating film waterproofing method in which the solvent-free polyurethane waterproof coating material is applied to the surface of the vehicle body has been attracting attention.

However, in the conventional polyurethane coating film waterproofing method, if a small amount of water remains on the surface of the vehicle body, the water content is vaporized to form water vapor, causing the polyurethane coating film to swell, causing an adhesive failure, or causing the polyurethane coating film to swell. There is a problem that the membrane itself is hydrolyzed and deteriorated.

In addition, the conventional polyurethane coating waterproofing method has a drawback that if a cracking portion is present in the waterproof sheet layer, the polyurethane coating layer is also cracked to cause adhesive failure. Further, in the conventional polyurethane coating film waterproofing method, if the waterproof sheet layer has irregularities, the polyurethane coating layer is also likely to have irregularities.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to eliminate the above-mentioned drawbacks of the prior art and prevent swelling and peeling. A composite waterproof sheet and a composite waterproof sheet that can be adhered well to the body surface and that does not cause co-cracking or step differences in the waterproof layer even when the waterproof layer is provided on the uppermost layer of the waterproof sheet with cracks and irregularities It is to provide the waterproof coating construction.

[0013]

The gist of the present invention is that the upper layer side nonwoven fabric is fused to the upper layer side of the vulcanized rubber sheet and the lower layer side nonwoven fabric is fused to the lower layer side. The present invention relates to a characteristic composite waterproof sheet and a coating film waterproof construction product using the composite waterproof sheet.

In the present invention, the vulcanized rubber sheet is J
Any material suitable for the synthetic polymer roofing sheet defined in IS-A6008 may be used, and examples thereof include a vulcanized ethylene propylene diene rubber sheet, a chlorosulfonated polyethylene sheet, and a chloroprene rubber sheet.

Further, in the present invention, the upper layer side non-woven fabric may be any one which is practically used for industrial use, and a non-woven fabric of fibers having a polar group in the molecule is particularly preferable because it has excellent adhesiveness to the polyurethane coating film. Is. Here, examples of the nonwoven fabric of fibers having a polar group in the molecule include polyester fiber-based nonwoven fabric, polyamide fiber-based nonwoven fabric, and acrylic fiber-based nonwoven fabric.

This type of non-woven fabric of fibers having a polar group in the molecule is bonded to a polyolefin film by needle punching.

Here, the polyolefin film is a polyethylene film, an ethylene / α-olefin copolymer film, an ethylene / vinyl acetate copolymer film, an ethylene / acrylic acid copolymer film,
An ethylene / acrylic ester copolymer film or the like is used.

Since these polyolefin films have heat-sealing properties, the nonwoven fabric bonded to the polyolefin film by needle punching can be easily heat-sealed to the vulcanized rubber sheet. The non-woven fabric bonded by the polyolefin film and the needle punch does not peel off even if it is contacted with the organic solvent.

Further, in the present invention, as the lower layer side non-woven fabric, non-polar fiber non-woven fabric having no polar group in the molecule, for example, polyolefin fiber non-woven fabric is desirable. This is because the non-polar fiber non-woven fabric is excellent in water resistance, low water absorption, and alkali resistance, and as a result, does not cause hydrolysis deterioration or adhesive breakage even if there is water on the surface of the precursor, and also has excellent ventilation cushioning. is there.

In the present invention, as the waterproof coating film, there is no danger of fire occurrence, good drying property at the time of construction and excellent water resistance and weather resistance after the construction, for example, solvent-free polyurethane waterproof paint, Solventless tar polyurethane waterproof paint, solventless polysulfide waterproof paint, solventless silicone waterproof paint, solventless epoxy resin waterproof paint, solventless polyester resin waterproof paint, liquid chloroprene rubber waterproof paint, acrylic resin waterproof paint, etc.

On the other hand, when the composite waterproof sheet thus obtained and the waterproof coating film are applied to the surface of the running body, it is carried out as follows.

First, an adhesive, for example, a resin mortar or an epoxy adhesive is applied on the surface of the vehicle body, and then a composite waterproof sheet is laid on the adhesive.

The construction obtained at this stage is breathable because the lower nonwoven fabric layer is present on the precursor surface, and as a result, the vulcanized rubber is obtained even if water remains on the precursor surface. No swelling of the waterproof layer will occur.

Next, a waterproof coating material, for example, a solvent-free polyurethane waterproof coating material is applied on the upper side nonwoven fabric layer of the laid composite waterproof sheet to form a polyurethane coating film. At this time, since the upper nonwoven fabric layer of the composite heat-insulating waterproof sheet strongly adheres to the polyurethane coating film, no adhesion failure or swelling failure occurs at this interface.

The polyurethane coating waterproof structure thus obtained has a slightly higher temperature rise due to direct sunlight. For this reason, it is desirable to use a heat-resistant solvent-free polyurethane waterproof paint that meets heat insulation and waterproof specifications as the solvent-free polyurethane waterproof paint.

[0026]

The composite waterproof sheet of the present invention can be strongly bonded to the coating waterproof layer applied to the upper layer by first providing the upper nonwoven fabric on the upper side of the vulcanized rubber sheet.

Secondly, in the composite waterproof sheet of the present invention, since the lower nonwoven fabric layer is provided on the lower side of the vulcanized rubber sheet, the waterproof construction product obtained by applying the composite waterproof sheet on the running surface is Even if moisture is present on the surface of the precursor, it can remain in the lower nonwoven fabric layer to protect the vulcanized rubber sheet layer and the waterproof layer of the polyurethane coating from moisture corrosion deterioration, and the adhesive applied on the precursor surface It can penetrate into the lower nonwoven fabric layer and strongly adhere.

Thirdly, since the composite waterproof sheet of the present invention is provided with the non-woven fabric layers on both the upper and lower sides of the vulcanized rubber sheet, even if the vulcanized rubber sheet or the surface of the precursor has irregularities or cracks on both sides. The non-woven fabric layer absorbs these irregularities, so that the entire waterproof construction has no irregularities, and even if a waterproof coating layer is provided on top of it, co-cracking of the waterproof coating does not occur.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a composite waterproof sheet of the present invention and an embodiment of a waterproof film construction using the composite waterproof sheet of the present invention will be described with reference to the drawings.

(One Example of Composite Waterproof Sheet) Thickness 1.0
A 0.2 mm thick polyester fiber non-woven fabric on the upper surface of the vulcanized ethylene propylene diene rubber sheet and a polypropylene non-woven fabric layer of 2 mm thick on the lower surface of the vulcanized ethylene propylene diene rubber sheet are respectively heat-melted. By wearing the composite waterproof sheet of the present invention, an example product was obtained.

FIG. 1 is a cross-sectional view of one embodiment of the composite waterproof sheet of the present invention thus obtained.

In FIG. 1, 1 is a polyester fiber nonwoven fabric layer which is an upper nonwoven fabric layer, 2 is a vulcanized ethylene propylene diene rubber sheet layer which is a vulcanized rubber sheet layer, and 3 is a polypropylene fiber nonwoven fabric layer which is a lower nonwoven fabric layer.

As can be seen from FIG. 1, in one embodiment of the composite waterproof sheet of the present invention, first, a polyester fiber non-woven fabric layer 1 made of polar fibers is melted as an upper non-woven fabric layer on the vulcanized rubber sheet layer 2. Therefore, when the coating film waterproof coating is applied to the upper layer of the polyester fiber non-woven fabric layer 1, it can penetrate between the fibers to strongly adhere to each other and the polar group of the polyester fiber non-woven fabric layer 1 and the polar group of the coating film waterproof layer. It can be strongly bonded by adding a chemical bond with. In addition, the polyester fiber non-woven fabric layer 1 has a mechanical cushioning effect, so that the service life can be extended.

Secondly, in one embodiment of the composite waterproof sheet of the present invention, a non-polar polypropylene fiber nonwoven fabric layer 3 as a lower nonwoven fabric layer is integrally fused under the vulcanized rubber sheet layer 2. Therefore, it has ventilation / buffering property and water resistance. As a result, even if moisture exists on the surface of the vehicle, the vulcanized rubber sheet layer 2 can be effectively protected from water and the adhesion between the vehicle surface and the composite waterproof sheet can be obtained. Can be guaranteed.

(Composite Waterproof Sheet of Comparative Example) Thickness 1.0 mm
A composite waterproof sheet of a comparative example was obtained by heating and fusing a non-polar polypropylene fiber nonwoven fabric layer having a thickness of 2 mm only on the lower surface of the vulcanized ethylene propylene diene rubber sheet.

(Adhesion Test between One Example Product of Composite Waterproof Sheet and Polyurethane Coating Film) Next, the thus obtained one example product of the composite waterproof sheet of the present invention and the composite waterproof sheet of the comparative example are respectively tested. Three kinds of solvent-free polyurethane waterproof paints having different curing systems were applied to the upper layer to form a polyurethane coating film, and then the adhesive strength between the upper layer and the polyurethane coating film was measured.

The three solvent-free polyurethane waterproof paints used are as follows.

Polyurethane waterproof paint A Tolylene diisocyanate as an isocyanate component,
A two-component polyurethane waterproof paint using 3,3'-dichloro-4,4'diaminodiphenylmethane as a curing agent.

Polyurethane Waterproof Paint B A two-component polyurethane waterproof paint prepared by blending the above-mentioned polyurethane waterproof paint A with a tackifier.

Polyurethane Waterproof Paint C 1-pack moisture-curable polyurethane waterproof paint.

Next, the initial adhesive strength (kgf / 25 mm, maximum strength when peeled off over an adhesive length of 25 mm) of these adhesives which were not deteriorated by heat was measured.

Table 1 shows the results of these tests.

[0043]

[Table 1]

As can be seen from Table 1, in one embodiment of the composite waterproof sheet of the present invention, the vulcanized rubber sheet layer 2 is fused with the polyester fiber non-woven fabric layer 1 made of polar fibers as the upper non-woven fabric layer. When the polyurethane waterproof coating is applied, it easily penetrates between the fibers and can be strongly adhered, and also the chemical bond between the polar group of the polyester fiber non-woven fabric layer 1 and the polar group of the coating waterproof layer can be added to strongly adhere. . Such excellent adhesion is the same regardless of the type of polyurethane waterproof paint.

On the other hand, the composite waterproof sheet of the comparative example has a small adhesive strength because the polyurethane waterproof coating is directly applied on the vulcanized rubber sheet layer. Such poor adhesion is the same regardless of the type of polyurethane waterproof paint.

(First Example of Polyurethane Coating Waterproofing Work) Next, a polyurethane coating waterproofing work was applied using an embodiment of the composite waterproof sheet of the present invention. Solventless resin mortar was applied as an agent. Next, on the applied resin mortar, an example product of the composite waterproof sheet of the present invention shown in FIG. 1 was laid so that the lower nonwoven fabric layer 4 was on the lower side, and then compacted. Here, the joints of the composite waterproof sheet were butt-joined, and the joints were connected using joint tapes.

Finally, a solvent-free polyurethane waterproof paint was applied to the upper layer of the upper side non-woven fabric layer to form a polyurethane coating film, whereby a first example of a polyurethane coating film waterproof construction product was obtained.

FIG. 2 is a perspective explanatory view of a product of the first embodiment of the polyurethane coating film waterproof construction thus obtained.

In FIG. 2, 1 is a polyester fiber nonwoven fabric layer which is an upper nonwoven fabric layer, 2 is a vulcanized ethylene propylene diene rubber sheet layer which is a vulcanized rubber sheet layer, 3 is a polypropylene fiber nonwoven fabric layer which is a lower nonwoven fabric layer, and 4 is The concrete surface 5 is a resin mortar applied on the surface 4 of the concrete, and 6 is a polyurethane coating layer formed on the upper layer of the nonwoven fabric layer 1 on the upper side.

(Second Example of Polyurethane Coating Waterproof Structure) First, a solventless special epoxy resin adhesive was applied on the concrete surface.

Next, on the applied solventless special epoxy resin adhesive, one embodiment of the composite waterproof sheet of the present invention shown in FIG. 1 is laid so that the lower nonwoven fabric layer 4 is on the lower side. , Then rolled.

In this case, the joints of the composite waterproof sheet were butted, and the joints were connected using joint tapes.

Finally, by applying a solvent-free polyurethane waterproof paint to the upper layer of the upper side non-woven fabric layer 1 to form a polyurethane coating film, the second step of the polyurethane coating film waterproof construction is performed.
Example products were obtained.

(Characteristic Test Results of First and Second Examples of Polyurethane Coating Waterproof Construction) Next, these polyurethane coating waterproof constructions were exposed outdoors for 2 years, and then the polyurethane coating The peeling failure, the swelling failure, the presence / absence of water leakage, the presence / absence of cracks, etc. were observed.

As a result, the waterproof coating constructions of the first and second examples showed poor peeling and poor swelling even after being exposed for 2 years.
There were no water leaks or cracks. In particular, the polyurethane coating waterproof construction of the second embodiment in which the solventless special epoxy resin adhesive was applied on the concrete surface of the concrete adhered strongly to the surface of the concrete body even after being exposed for 2 years.

The coating waterproof structure of the first embodiment had an initial adhesion strength of 1.2 kg / cm ² to the concrete surface, and the coating waterproof structure of the second example had an initial adhesion to the concrete surface. The strength was 1.3 kg / cm ² , and sufficient adhesiveness was exhibited.

Moreover, these waterproof coating constructions also exhibited excellent results in terms of ventilation / bufferability, weather resistance and water resistance.

[0058]

EFFECT OF THE INVENTION The composite waterproof sheet of the present invention is, firstly, capable of penetrating and strongly adhering between fibers when a coating waterproof coating is applied on the upper layer, and secondly, a lower nonwoven fabric under the vulcanized rubber sheet layer. Since the layers are integrally fused, it is possible to exhibit ventilation / bufferability, water resistance and adhesiveness, and is industrially useful.

In addition, in the polyurethane waterproofing structure of the present invention, the upper layer can strongly adhere to the waterproof film and the lower layer can strongly adhere to the surface of the vehicle, so that the waterproof film cannot peel off or swell. It is capable of exhibiting excellent water resistance, weather resistance, ventilation / buffering properties, and heat insulation properties without the occurrence of water leak locations and cracks, and is industrially useful.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example product of a composite waterproof sheet of the present invention.

FIG. 2 is a perspective explanatory view of a first embodiment product of the coating film waterproofing construction of the present invention.

[Explanation of symbols]

 1 Upper layer nonwoven fabric layer 2 Vulcanized rubber sheet layer 3 Lower layer nonwoven fabric layer 5 Concrete surface 6 Adhesive layer 7 Coating layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaharu Okuma 3-529 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Hitachi Cable Ltd. Kansai Branch

Claims (6)

[Claims] 1. A composite waterproof sheet, wherein an upper layer side nonwoven fabric is fused to an upper layer side of a vulcanized rubber sheet, and a lower layer side nonwoven fabric is fused to a lower layer side of the vulcanized rubber sheet. 2. The composite waterproof sheet according to claim 1, wherein the vulcanized rubber sheet is a vulcanized synthetic rubber. 3. The composite waterproof sheet according to claim 1, wherein the non-woven fabric provided by fusion bonding to the upper layer side of the vulcanized rubber sheet is made of fibers having polar groups. 4. The composite waterproof sheet according to claim 1, wherein the non-woven fabric provided by fusion bonding to the upper layer side of the vulcanized rubber sheet is joined by an olefin film and a needle punch. 5. A composite waterproof sheet comprising a vulcanized rubber sheet having an upper layer side nonwoven fabric fused to an upper layer side thereof and a lower layer side nonwoven fabric fused to a lower layer side of the vulcanized rubber sheet. Is adhered on the surface of the vehicle body where the adhesive is applied so that it is on the lower side, and a waterproof film is applied on the upper surface side non-woven fabric layer. Stuff. 6. The waterproof coating product according to claim 5, wherein the waterproof coating layer is a polyurethane coating film.