JP2012026150A - Coating film waterproof sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating film waterproof sheet that can avoid the solvent trouble involved in coating of a waterproof material when constructing a coating film waterproof structure by applying a polyurethane waterproof material and that has high adhesive strength with a polyurethane waterproof material layer without the possibility that the inside can be broken due to a stress such as earthquakes, and that can provide a smooth and good appearance.SOLUTION: In a coating film waterproof sheet 10, a synthetic resin film 1 is sandwiched between nonwoven fabric layers 2, 3 and integrated with the nonwoven fabric layers. The nonwoven fabric layer 2 installed in a lower layer of the synthetic resin film 1 is formed of a nonwoven fabric with a basis weight of 100-500 g/mthat is entangled by needle punching or fluid entanglement, and the nonwoven fabric layer 3 installed in a upper layer of the synthetic resin film 1 is formed of a chemical bond nonwoven fabric. And a polyurethane film 5 is installed above the nonwoven fabric layer 3 in the upper layer through an adhesive layer 4.

Description

  The present invention relates to a waterproof coating sheet used in waterproofing construction of a coating film and a waterproof coating structure using the same.

  As membrane waterproofing work in architectural waterproofing work, coating film waterproofing work, asphalt waterproofing work, and sheet waterproofing work are currently widely implemented. Among these, the waterproofing construction of the coating film forms a waterproofing structure of the coating film by applying a waterproofing sheet such as polyurethane on the ground surface of the concrete or the like through an adhesive layer, and then applying a waterproofing material such as polyurethane. Is.

  As a coating waterproof sheet used for the coating waterproofing construction, a synthetic resin film layer B (intermediate layer) is woven with a thermocompression bonding type nonwoven fabric layer A (upper layer) and a nonwoven fabric layer C (entangled by needle punching or fluid entanglement). A three-layer structure laminated body that is sandwiched between and integrated with a lower layer has been proposed (Patent Document 1). In this three-layer structure laminate, the synthetic resin film layer B functions as a water-shielding layer, and the nonwoven fabric layer C is a ventilation layer for preventing water vapor generated from the base (for example, concrete) in the horizontal direction to prevent swelling. The thermo-compression type nonwoven fabric layer A increases the adhesive strength with the waterproof material layer by partially infiltrating the waterproof material (for example, polyurethane-based waterproof material) coated on this, and has a waterproof coating structure. It works to reinforce.

  However, when a polyurethane waterproof material is applied onto such a three-layer coating film waterproof sheet and the waterproof material penetrates into the thermocompression bonding type nonwoven fabric layer A, naturally, the solvent in the waterproof material is also reduced. It penetrates into the thermocompression-bonding type nonwoven fabric layer A, and a part of the solvent separates from the polyurethane and penetrates deeper, resulting in insufficient drying. In particular, the solvent that has penetrated to the deep part is in a state of being blocked by the polyurethane waterproof material in the superficial part and remains inside. Therefore, delamination may occur in the sheet due to the influence of the residual solvent, or the coating film may swell and the surface of the waterproof coating structure may swell. In addition, there is a problem in that the upper thermocompression-bonding type nonwoven fabric layer contains stress due to an earthquake or the like, thereby causing delamination.

  A sheet in which a polyurethane film is laminated on a hot embossed non-woven fabric has been reported as a coating waterproof sheet capable of avoiding the solvent problem that occurs when such a polyurethane waterproof material is applied (Patent Document 2). ). According to the coated waterproof sheet disclosed in Patent Document 2, the above-described problem can be avoided because the upper polyurethane film blocks the solvent. In addition, since the upper polyurethane film has good affinity with the polyurethane waterproof material, an effect of increasing the adhesive strength of the polyurethane waterproof material layer after construction is also obtained. On the other hand, a coated waterproof sheet (Patent Document 3) in which a polyurethane layer is provided by gravure coating a polyurethane resin solution on one side of a PET film is also known. Since the polyurethane resin on the surface expresses affinity with the polyurethane waterproof material, it is expected to solve the above-mentioned solvent problem and increase the adhesive strength with the polyurethane waterproof material layer.

JP 2008-303549 A JP 7-144393 A JP 2008-133671 A

  However, even in the coated waterproof sheet described in Patent Document 2, as with the sheet of Patent Document 1, when stress is applied due to an earthquake or the like, the embossed nonwoven fabric layer breaks inside and causes delamination. May occur. On the other hand, when the polyurethane resin layer is a sheet printed on the surface, such as the waterproof coating sheet described in Patent Document 3, the solvent contained in the polyurethane waterproof material or the solvent accidentally spilled during the waterproof material coating As a result of this, peeling of the printed layer (polyurethane resin layer) and interfacial peeling between the PET film and the printed layer are likely to occur, resulting in insufficient adhesion strength with the polyurethane-based waterproofing material layer after construction. The surface of the waterproof coating structure may swell and swell.

  The present invention has been made in view of the above circumstances, and when applying a polyurethane waterproof material to construct a waterproof coating structure, the polyurethane waterproof material is avoided while avoiding a solvent problem associated with the application of the waterproof material. An object of the present invention is to provide a waterproof coating sheet and a waterproof coating structure using the same, which has a high adhesive strength with the layer, and does not have a risk of breaking inside due to stress such as an earthquake, and provides a smooth and good appearance. .

  The inventors of the present invention have made extensive studies to solve the above problems. As a result, first, in order to obtain a coated waterproof sheet that can avoid the influence of the solvent and has a high affinity with the polyurethane waterproof material, the uppermost layer of the three-layer structure laminate described in Patent Document 1 is used. Attempts were made to laminate a polyurethane film to each other via an adhesive. However, the coating waterproof sheet obtained in this way has a weakness that the thermocompression-bonding type nonwoven fabric layer A in the three-layer structure laminate is weak, so that the inside is easily broken due to stress such as an earthquake. It was done. Therefore, the present inventors have further studied and replaced with the thermocompression-bonding type non-woven fabric provided under the adhesive layer. The present inventors have found that the use of a chemically bonded non-woven fabric that has been widely used in various applications can solve the above-mentioned problems at once without the risk of internal breakage due to stress such as an earthquake.

  In addition, as a reason why the chemical bond nonwoven fabric has not been used as the upper layer of the three-layer structure laminate so far, in addition to the high cost of the chemical bond nonwoven fabric, there are the following reasons. That is, as described above, the nonwoven fabric layer disposed on the upper layer of the conventional three-layer structure laminate is intended to increase the adhesive strength to the polyurethane waterproof material layer by allowing a part of the polyurethane waterproof material to penetrate into the nonwoven fabric layer. In view of the purpose, it is judged that a chemical bond nonwoven fabric in which fibers are firmly fixed with a resin is difficult to permeate a polyurethane waterproof material and is not suitable as a nonwoven fabric layer disposed on an upper layer. It is thought that it was. However, in the present invention, the merit of the chemical bond nonwoven fabric can be enjoyed to the maximum by adopting a unique configuration.

The coated waterproof sheet according to the present invention is a coated waterproof sheet in which a synthetic resin film is sandwiched and integrated with a nonwoven fabric layer, and the nonwoven fabric layer provided under the synthetic resin film is formed by needle punching or fluid entanglement. The nonwoven fabric layer formed with the entangled basis weight of 100 to 500 g / m ² , the nonwoven fabric layer provided on the upper layer of the synthetic resin film is formed of a chemical bond nonwoven fabric, and an adhesive layer is interposed on the upper nonwoven fabric layer. A polyurethane film is provided.

In the coated waterproof sheet according to the present invention, the basis weight of the chemical bond nonwoven fabric is preferably 50 to 200 g / m ² . The synthetic resin film preferably has a thickness of 10 to 100 μm. The polyurethane film preferably has a thickness of 10 to 100 μm. The adhesive layer is preferably formed of a polyurethane-based adhesive. In the coated waterproof sheet according to the present invention, it is preferable that a large number of holes are formed in the thickness direction, and the total opening ratio of the large number of holes is 40% or less with respect to the surface area.

  The waterproof coating structure according to the present invention is such that the coated waterproof sheet of the present invention is laid on the base surface with the polyurethane film side up, and the polyurethane waterproof material layer on the polyurethane film of the coated waterproof sheet Is formed.

  According to the present invention, when a waterproof coating is applied by applying a polyurethane waterproof material, the adhesive strength with the polyurethane waterproof material layer is high while avoiding the solvent problem associated with the application of the waterproof material. A smooth and good appearance can be obtained without the risk of internal breakage due to such stress.

It is sectional drawing which shows one Embodiment of the coating-film waterproof structure using the coating-film waterproof sheet of this invention.

  Hereinafter, the waterproof coating sheet and the waterproof coating structure according to the present invention will be specifically described with reference to the drawings illustrating an embodiment of the present invention, but the present invention is not limited to the illustrated examples. The present invention can be implemented with appropriate modifications within a range that can be adapted to the purpose described above and below, and these are all included in the technical scope of the present invention.

  FIG. 1 shows an embodiment of a waterproof coating structure in which a waterproof membrane 10 of the present invention is laid on the surface of a base 11 and a polyurethane waterproof material layer 12 is further coated thereon.

  First, the coating film waterproof sheet of this invention is demonstrated.

  The coated waterproof sheet 10 of the present invention is a coated waterproof sheet in which the synthetic resin film 1 is sandwiched and integrated with the nonwoven fabric layers 2 and 3, and is a nonwoven fabric layer (hereinafter referred to as “lower layer” provided below the synthetic resin film 1. 2 may be referred to as a “nonwoven fabric layer” 2 is formed of a nonwoven fabric entangled by needle punching or fluid entanglement, and is provided on the upper layer of the synthetic resin film 1 (hereinafter also referred to as “upper nonwoven fabric layer”) 3 Is formed of a chemical bond nonwoven fabric, and a polyurethane film 5 is provided on the upper nonwoven fabric layer 3 via an adhesive layer 4.

  In the present invention, the synthetic resin film 1 functions as a water shielding layer.

  There is no restriction | limiting in particular as the synthetic resin film 1, In addition to polyester films, polyamide films, polyolefin films such as polypropylene films and polyethylene films, films of these copolymers, etc., ethylene-vinyl alcohol copolymer Examples thereof include a coalesced resin (EVOH) film and an ethylene-vinyl acetate copolymer resin (EVA) film. Among these, considering the processability at the time of coating film waterproof sheet manufacture and the handleability at the time of polyurethane waterproof layer construction, those having appropriate rigidity and strength are desirable, and specifically polyolefin films are preferred.

  Moreover, as the synthetic resin film layer 1, a film layer in which a conductive metal such as aluminum is deposited, a film in which an aluminum foil is laminated, or the like may be used. Thereby, heat insulation can be improved. In this case, the thickness of the vapor deposition layer or the aluminum foil layer is preferably 50 angstroms or more, more preferably 100 angstroms or more. In such a synthetic resin film layer 1, it is also possible to detect the presence of pinholes in the film by measuring the capacitance and the like.

  The thickness of the synthetic resin film 1 is preferably 10 to 100 μm, more preferably 15 μm or more and 50 μm or less, and further preferably 20 μm or more and 30 μm or less. If the thickness of the synthetic resin film 1 is within the above range, the film is too thin and the function as a water shielding layer is not impaired due to the occurrence of pinholes, etc., and the film is too thick and the coated waterproof sheet becomes heavy. There is no risk of hindering handling during transportation.

  In addition, the synthetic resin film 1 in the waterproof coating sheet may bite into the lower nonwoven fabric layer 2 and the upper nonwoven fabric layer 3 in the production process, and the synthetic resin film layer 1 may have irregularities on both sides. is there. Therefore, what is necessary is just to measure the thickness of the synthetic resin film 1 in a coating-film waterproof sheet as follows. That is, first, a test piece is sampled from 20 arbitrary portions of the waterproof coating sheet. Next, the test piece is cut so that the cut surface is vertical, vapor-deposited so that the cut surface can be observed, and photographed with a scanning electron microscope at an arbitrary magnification. In this photographed image, the length from the end of the film portion (synthetic resin film layer 1) entering the upper nonwoven fabric layer 3 to the end of the film portion entering the lower nonwoven fabric layer 2 is measured and tested. Let it be the film thickness of a piece. And each film thickness in the obtained 20 test pieces is averaged, and it is set as the thickness of the synthetic resin film layer 1. In addition, when there is a concern that the shape of the cross-section changes during the above-described cutting, in order to suppress this shape change, the coating waterproof sheet may be cut after being frozen using a quick freezing device.

  In the present invention, the lower nonwoven fabric layer 2 provided in the lower layer of the synthetic resin film 1 ensures the air permeability in the horizontal direction, and fulfills the function of allowing water vapor and the like generated from the base to escape well.

  The lower nonwoven fabric layer 2 is formed of a nonwoven fabric entangled by needle punching or fluid entanglement. Here, examples of the fluid entanglement include water punch processing. In manufacturing the nonwoven fabric forming the lower nonwoven fabric layer 2, embossing (pre-embossing) is weakly applied in advance before needle punching or fluid entanglement so that the fibers do not fall apart immediately after spinning. it can. Since the thermal bonding point by the pre-embossing is almost removed by subsequent needle punching or fluid entanglement, this hardly hinders the horizontal air permeability.

  Although the fiber which comprises the nonwoven fabric which forms the lower layer nonwoven fabric layer 2 may be either a long fiber or a short fiber, it is preferable that it is a long fiber from a viewpoint of intensity | strength. The fiber material is not particularly limited, and preferred examples include glass fibers, acrylic fibers, polyester fibers, polyamide fibers, polyolefin fibers such as polypropylene, and vinyl fibers such as polyvinyl alcohol.

The basis weight of the nonwoven fabric forming the lower nonwoven fabric layer 2 is 100 to 500 g / m ² . When the basis weight is less than 100 g / m ² , sufficient air permeability cannot be ensured, and the strength of the lower nonwoven fabric layer 2 becomes insufficient. There is concern about delamination. On the other hand, when the basis weight exceeds 500 g / m ² , the coated waterproof sheet becomes heavy, and the workability at the time of constructing the polyurethane waterproof material layer is lowered. The basis weight of the nonwoven fabric forming the lower nonwoven fabric layer 2 is preferably 150 g / m ² or more and 400 g / m ² or less, more preferably 200 g / m ² or more and 300 g / m ² or less. .

  The lower layer nonwoven fabric layer 2 is an evaluation method in JASS8 [JASS (1986) Reference Test 1. The air permeability between the base surface determined by the performance evaluation test method “8. Ventilation resistance test between base membrane” (pages 340 to 342)] of 10 mmAq. The outflow amount is preferably 170 cc or more when pressurized air. If the air permeability of this level is present, there is no concern that the surface of the waterproof structure after coating will bulge or rise.

  In the present invention, the upper nonwoven fabric layer 3 provided on the upper layer of the synthetic resin film 1 is a base material for maintaining the smoothness of the surface when the polyurethane film 5 is bonded.

  The upper non-woven fabric layer 3 is formed of a chemical bond non-woven fabric, so that the inside is not broken by a stress such as an earthquake. Here, the chemical bond nonwoven fabric is one in which fibers are partially fixed with a binder resin, and is manufactured by a known method such as impregnating a binder resin into a sheet-like fiber lump (web). .

  The chemical bond nonwoven fabric forming the upper nonwoven fabric layer 3 may be composed of either long fibers or short fibers, but is preferably composed of long fibers from the viewpoint of strength. The fiber material is not particularly limited, and preferred examples include glass fibers, acrylic fibers, polyester fibers, polyamide fibers, polyolefin fibers such as polypropylene, and vinyl fibers such as polyvinyl alcohol.

  There is no restriction | limiting in particular as binder resin used for manufacture of a chemical bond nonwoven fabric, An acrylic resin, ethylene-vinyl acetate copolymer resin (EVA), a polyester-type resin, a polyamide-type resin, a phenol-type resin etc. are mentioned. Among these, an acrylic resin and an ethylene-vinyl acetate copolymer resin (EVA) are preferable in that the fibers can be bonded with high adhesive strength.

  The impregnation ratio of the binder resin in the chemical bond nonwoven fabric is not particularly limited, but the binder resin is preferably 5 to 40% by mass, more preferably 10 to 30% by mass, further based on the total mass of the chemical bond nonwoven fabric. Preferably it is 15-25 mass%.

Basis weight of the chemical bonded nonwoven is preferably 50 to 200 g / ^{m 2,} more preferably 70 g / ^{m 2} or more, 150 g / ^{m 2} or less is the well, further preferably 90 g / ^{m 2} or more, 120 g / m ² or less is good is. If the basis weight of the chemical bond nonwoven fabric is within the above range, the thickness of the upper nonwoven fabric layer (chemical bond nonwoven fabric layer) is too thin, and the smoothness of the coating waterproof structure surface obtained when the polyurethane waterproof material layer is applied The chemical bond nonwoven fabric layer does not break or is damaged by stress such as earthquake. In addition, when the basis weight of the chemical bond nonwoven fabric is within the above range, the upper waterproof nonwoven layer (chemical bond nonwoven fabric layer) is too thick and the coating waterproof sheet becomes heavy and lacks flexibility. There is no risk of hindering workability.

  The thickness of the chemical bond nonwoven fabric is preferably 0.5 to 1.5 mm, more preferably 0.6 mm or more and 1.2 mm or less, and even more preferably 0.7 mm or more and 0.9 mm or less. It is good to be. When the thickness of the chemical bond nonwoven fabric is within the above range, the smoothness of the waterproof surface of the coating film obtained when the polyurethane waterproof material layer is applied may be damaged, or the chemical bond nonwoven fabric layer may be broken by stress such as earthquake. There is nothing. In addition, when the thickness of the chemical bond nonwoven fabric is too thick, the coated waterproof sheet is heavy and lacks flexibility, and the workability at the time of construction of the polyurethane waterproof material layer also tends to be lowered.

  For example, the chemical bond nonwoven fabric preferably has a tensile strength of 100 to 500 N / 5 cm, and a tear strength of 5 to 70 N / 5 cm. More preferably, the tensile strength is 150 to 400 N / 5 cm, the tear strength is 20 to 50 N / 5 cm, and more preferably, the tensile strength is 200 to 300 N / 5 cm, and the tear strength is 30 to 40 N / 5 cm. .

  In the present invention, the polyurethane film 5 provided on the upper nonwoven fabric layer 3 via the adhesive layer 4 prevents the penetration of the solvent when the polyurethane waterproof material is applied to construct the waterproof coating structure. While avoiding the influence, it plays the role which improves the adhesive strength of a polyurethane-type waterproof material layer. Incidentally, as a method of laminating the nonwoven fabric layer and the polyurethane film, there are a thermocompression bonding method for fusing and crimping the film and a thermal melting method (laminating method) for laminating the film material. A laminating method using an adhesive is employed from the viewpoint of easy setting and easy maintenance of flexibility.

  As the polyurethane film 5, for example, a film formed by dry-forming a known polyurethane resin obtained by a polyaddition reaction of diisocyanate and diol by a known method can be preferably used. Further, the polyurethane film 5 may contain a pigment or the like within a range not impairing the effects of the present invention, whereby the coated waterproof sheet can be colored in a desired color.

  The thickness of the polyurethane film 5 is preferably 10 to 100 μm, more preferably 10 μm or more and 80 μm or less, and further preferably 15 μm or more and 30 μm or less. When the thickness of the polyurethane film 5 is within the above range, sufficient solvent penetration ability and adhesive strength can be exhibited when a polyurethane waterproof material is applied, and the film is too thick and the coated waterproof sheet becomes heavy. There is no risk of hindering handling during transportation.

  There is no restriction | limiting in particular as the adhesive bond layer 4, It can form by apply | coating well-known resin adhesives, such as a polyurethane adhesive and an acrylic adhesive. Preferably, from the viewpoint of adhesiveness with the polyurethane film 5, the adhesive layer 4 is preferably formed of a polyurethane adhesive.

  The amount of the adhesive applied when forming the adhesive layer 4 is not particularly limited. For example, the adhesive strength between the polyurethane film 5 and the upper nonwoven fabric layer 3 joined by the adhesive layer 4 is not limited. May be set in accordance with the unevenness of the surface of the upper non-woven fabric layer 3 so as to be 9.8 N / cm or more.

  Furthermore, the coating film waterproof sheet 10 of the embodiment shown in FIG. 1 is formed with a large number of holes (hereinafter also referred to as “through holes”) 6 in the thickness direction. Thus, by providing a through-hole in the coating waterproof sheet, the polyurethane waterproof material can be directly bonded to the base 11 (or the adhesive layer 14 for bonding the base 11 and the coating waterproof sheet 10). The bonding strength can be improved. Of course, the coated waterproof sheet according to the present invention may not have through holes.

  When the coated waterproof sheet according to the present invention has through-holes, the total opening ratio of the through-holes is preferably 40% or less, more preferably 30% or less, still more preferably relative to the surface area of the sheet. It should be 25% or less. If the total opening ratio is too high, the area ratio occupied by each layer and each film is lowered, and thus the functions of each layer and each film are not sufficiently exhibited, for example, the air permeability is lowered in the lower nonwoven fabric layer 2. . If the total aperture ratio is in the above range, the shape and size of one through hole is not particularly limited, but a round shape having a diameter of about 6 to 10 mm is usually employed. Further, it is desirable that the through holes are formed dispersed on the sheet surface.

  The coated waterproof sheet 10 of the present invention can be produced by appropriately laminating the above-described layers and films by a known method. For example, the waterproof coating sheet 10 is formed by 1) applying an adhesive to one surface of the upper nonwoven fabric layer 3 to form an adhesive layer 4, and forming a polyurethane film 5 on the upper nonwoven fabric layer 3 through the adhesive layer 4. To form an upper layer laminate, and then the upper layer laminate and the lower layer nonwoven fabric layer 2 are arranged so that the upper layer nonwoven fabric layer 3 side and the lower layer nonwoven fabric layer 2 face each other, and a synthetic resin film 1) A method in which the synthetic resin film 1 is sandwiched between the lower nonwoven fabric layer 2 and the upper nonwoven fabric layer 3, and an adhesive is applied to one surface of the polyurethane film 5. The adhesive layer 4 can be formed by coating, and the lower layer laminate can be placed on the adhesive layer 4 so that the upper nonwoven fabric layer 3 faces and bonded. Hereinafter, although these methods are demonstrated, the coating-film waterproof sheet of this invention is not necessarily limited to what was obtained by the said method. The through hole 6 may be formed by laminating each layer or each film to obtain a sheet, and then performing a perforating process using a known perforated machine or the like.

  In the method 1), first, the upper layer laminate in which the upper layer nonwoven fabric layer 3 and the polyurethane film 5 are joined, for example, is obtained by applying a two-component reactive polyurethane adhesive solution to the upper layer nonwoven fabric layer 3 and then polyurethane. It is produced by a dry transfer method in which the film 5 is placed and pressure-bonded, or a bonding method in which a moisture-curable hot melt polyurethane adhesive is applied to the upper nonwoven fabric layer 3 and the polyurethane film 5 is placed thereon and pressure-bonded. be able to.

  In the above method 1), when the synthetic resin film 1 is sandwiched and integrated by the upper layer laminate and the lower layer nonwoven fabric layer 2, for example, a lamination method such as an extrusion lamination method (extrusion lamination method) or a dry lamination method. Alternatively, a method of stacking and integrating by a coating method can be employed. In particular, a method of laminating the raw material of the synthetic resin film 1 in a molten state or a semi-molten state between the lower nonwoven fabric layer 2 and the upper nonwoven fabric layer 3 of the upper layer laminate (a sand lamination method which is one of extrusion lamination methods) ) Is preferably used. According to this sandrami method, the synthetic resin film 1 and each nonwoven fabric are solidified so that they are excellent in productivity and part of the synthetic resin film 1 penetrates into the lower nonwoven fabric layer 2 and the upper nonwoven fabric layer 3 respectively. The space between the layers 2 and 3 can be firmly fixed.

  In the above method 2), when the lower layer laminate is integrally formed by sandwiching the synthetic resin film 1 between the lower layer nonwoven fabric layer 2 and the upper layer nonwoven fabric layer 3, for example, extrusion lamination method (extrusion lamination method) or dry lamination method is used. A lamination method such as a lamination method or a method of stacking and integrating by a coating method can be employed. In particular, a method of laminating a raw material of the synthetic resin film 1 in a molten state or a semi-molten state between the lower nonwoven fabric layer 2 and the upper nonwoven fabric layer 3 (a sand lamination method which is one of extrusion lamination methods) is preferably used. It is done. According to this sandrami method, the synthetic resin film 1 and each nonwoven fabric are solidified so that they are excellent in productivity and part of the synthetic resin film 1 penetrates into the lower nonwoven fabric layer 2 and the upper nonwoven fabric layer 3 respectively. The space between the layers 2 and 3 can be firmly fixed.

  In the above method 2), a dry transfer method in which a two-component reactive polyurethane adhesive solution is applied to the polyurethane film 5 and the lower layer laminate is placed thereon and pressure-bonded thereon, or wet-cured on the polyurethane film 5 is applied. What is necessary is just to join the said lower layer laminated body and the polyurethane film 5 by the bonding method etc. which apply | coat a type | mold hot-melt polyurethane adhesive, and mounts the said lower layer laminated body on it, and crimps | bonds it.

  The polyurethane film 5 can be produced, for example, by applying a polyurethane resin on a releasable process paper with a clearance, a knife, a rotary screen or the like. Of course, a commercially available polyurethane film 5 may be used. The upper nonwoven fabric layer 3 and the lower nonwoven fabric layer 2 may be prepared in advance, or commercially available ones may be used.

  In the above embodiment, the waterproof coating sheet 10 made of a five-layer structure composed of the lower layer nonwoven fabric layer 2, the synthetic resin film 1, the upper layer nonwoven fabric layer 3, the adhesive layer 4 and the polyurethane film 5 is shown. Needless to say, a coating waterproof sheet having six or more layers in which an arbitrary layer (including a film) is added to the five-layer structure laminate is also included in the scope of the present invention.

  Next, the waterproof coating structure of the present invention will be described.

  The waterproof coating structure of the present invention is such that the above-described waterproof coating sheet 10 of the present invention is laid on the surface of the base 11 with the polyurethane film 5 side up, and on the polyurethane film 5 of the waterproof coating sheet 10. A polyurethane waterproof material layer 12 is formed.

  Furthermore, in the coating film waterproof structure of the embodiment shown in FIG. 1, a primer layer 13 is provided on the upper surface of the base 11 on which the coating film waterproof sheet 10 is laid, and an adhesive layer 14 is provided on the primer layer 13. It has been.

  The material used as the base 11 is usually concrete, asphalt, vinyl chloride sheet or the like. There is no restriction | limiting in particular as the polyurethane-type waterproof material layer 12, It can form with the well-known polyurethane-type waterproof material widely used in the coating-film waterproofing construction. There is no restriction | limiting in particular also about the primer layer 13 and the adhesive bond layer 14, and what is necessary is just to form with the well-known primer coating material and adhesive agent currently used widely in the coating-film waterproofing construction.

  The construction method for the waterproof coating structure of the present invention may be any known method that is widely used in waterproofing construction of the coating film, and is not particularly limited. For example, first, a primer coating is applied to the upper surface of a base 11 such as concrete to form a primer layer 13, and then an adhesive is applied to form an adhesive layer 14. After placing on the adhesive layer 14 with the polyurethane film 5 side up (in other words, the lower nonwoven fabric layer 2 side is adhered to the adhesive layer 14), the polyurethane film 5 of the waterproof coating sheet 10 is placed. A polyurethane waterproof material may be applied from above to form the polyurethane waterproof material layer 12, and when the waterproof material is cured, the construction is completed.

  The paint film waterproof sheet and paint film waterproof structure of the present invention are suitably used for waterproof construction work such as a rooftop of a building or a roof.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited by the following examples, but may be appropriately modified within a range that can meet the purpose described above and below. Of course, it is possible to implement them, and they are all included in the technical scope of the present invention.

  In the following examples, “%” means “% by mass” and “parts” means “parts by mass” unless otherwise specified.

  Various physical properties of the nonwoven fabric or the waterproof coating sheet in the following examples and comparative examples were measured as follows. Hereinafter, with respect to the sample direction, the machine direction (manufacturing flow direction during non-woven fabric production) is referred to as MD direction, and the direction orthogonal to the machine direction is referred to as CD direction.

<Unit weight (total basis weight)>
It calculated | required according to JIS-L1906. Specifically, five test pieces of 20 cm in the MD direction and 25 cm square in the CD direction are sampled in the CD direction, and the respective masses are measured. After calculating these average values, the mass per 1 m ² was converted to the basis weight (g / m ² ).

<Thickness>
It calculated | required according to JIS-L1906. Specifically, the pressure condition was measured at 1.96 kPa (20 gf / cm ² ) at 10 points per 1 m of the total width of the test piece in the CD direction, and the average value thereof was calculated as the thickness (mm).

<Tensile strength / Tear strength>
Test pieces were punched into 5 cm × 20 cm strips in the vertical and horizontal directions, and the tensile strength and tear strength of the test pieces were measured according to JIS-L1906 5.3.1. In this measurement, a Tensilon tensile tester was used, and N = 5 in both the vertical and horizontal directions.

<Tape peeling strength>
Melco tape ("BWII" manufactured by Sankasei Co., Ltd., 2.5cm wide x 15cm) is applied to the surface of the waterproof film on the polyurethane film side so that air does not enter with a compact press machine (manufactured by Hashima Corporation). And 180 ° peel test according to JIS-K-6854-2 (1999) at a peeling speed of 100 mm / min. If the obtained value was 9.8 N / cm or more, it was determined to be acceptable.

<Deaeration breathability>
JASS8 (1986) Reference Test The membrane waterproof layer was measured according to the performance evaluation test method “8. Ventilation resistance test between the substrate” (pages 340 to 342).

(Examples 1-3)
First, polyethylene terephthalate (PET) was melt-spun and a web was obtained by a spunbond method. Next, this web was subjected to needling using a needle punch machine, and the nonwoven fabric for lower layer weight (nonwoven fabric entangled by needle punch) shown in Table 1 was produced. On the other hand, the above-mentioned web was subjected to chemical bond processing by a dipping method using an acrylic resin as a binder resin to produce a nonwoven fabric for upper layer weight (chemical bond nonwoven fabric) with a basis weight and thickness shown in Table 1. The strength (tensile strength, tear strength) of the upper layer nonwoven fabric (chemical bond nonwoven fabric) is as shown in Table 1.

  Next, using a T-die film extruder, lamination was performed by sandwiching polyethylene (PE) having a melt index of 7 (g / 10 min), which is in a semi-molten state, between the nonwoven fabric for the upper layer and the nonwoven fabric for the lower layer. A synthetic resin film (PE) having a thickness was sandwiched between the upper nonwoven fabric layer and the lower nonwoven fabric layer to obtain an integrated laminate.

  On the other hand, a one-component polyurethane solution is applied onto a release paper and dried to prepare a 20 μm polyurethane film. A two-component polyurethane adhesive is applied to the polyurethane film, and the upper nonwoven fabric layer side of the laminate is further formed thereon. After the surfaces were stacked, pressure-bonded and aged, the release paper was removed to obtain a waterproof coating sheet. Further, the coating waterproof sheet is perforated by using a perforating machine so that round holes (diameter 6 mm) are arranged in a staggered arrangement with a spacing of 6 cm so that the total opening ratio is 26%. A perforated type waterproof coating sheet was obtained. The physical properties of the obtained waterproof coating sheet are as shown in Table 1.

Next, an adhesive (Chloroprene-based adhesive: Nogawa Chemical Co., Ltd., trade name DC644G) was applied to the concrete (base) surface so as to be 0.4 kg / m ^2, and then the coating film obtained above A plurality of waterproof sheets were attached such that the polyurethane film was on the front side and the lower nonwoven fabric layer was on the adhesive-coated surface side. At this time, the plurality of waterproof coating sheets were spread with their end surfaces attached to each other without any gaps. Next, a general-purpose polyurethane waterproofing material for flat field was applied from above to 1 kg / m ^2, and after curing, the polyurethane waterproofing material for flat field was applied again at 1 kg / m ² (total 2 kg / m 2). ² ). Next, after the overcoated waterproofing material is cured, a polyurethane waterproofing material layer is formed by applying a polyurethane waterproofing material for a top coat containing an ultraviolet absorber or the like so as to be 0.3 kg / m ^2. A waterproof structure was constructed. The coating film waterproof structure thus formed was evaluated as follows. The results are shown in Table 1.

<Finish>
The surface (upper surface) of the waterproof coating structure after construction was visually observed, and the case where the surface was smooth was evaluated as “◯” and the case where fuzz was conspicuous was evaluated as “x”.

(Comparative Examples 1 and 2)
A coated waterproof sheet was obtained in the same manner as in Example 1 except that the thermobonded nonwoven fabric obtained as follows was used in place of the chemical bond nonwoven fabric in Example 1 as the upper layer nonwoven fabric. In the same manner as described above, a waterproof coating structure using the waterproof coating sheet was constructed. Table 1 shows the physical properties of the obtained waterproof coating sheet and the evaluation results of the waterproof coating structure.

  The thermocompression bonding type nonwoven fabric was produced as follows. That is, polyethylene terephthalate (PET) was melt-spun and a web was obtained by the spunbond method. The embossing process was performed so that the embossed area ratio was 22% in Comparative Example 1 and 11% in Comparative Example 2. And a thermocompression bonding type nonwoven fabric having the basis weight and thickness shown in Table 1 was obtained. In addition, the strength (tensile strength, tear strength) of this thermocompression bonding type nonwoven fabric is as shown in Table 1.

(Comparative Example 3)
A coated waterproof sheet was obtained in the same manner as in Example 1 except that needling was performed so that the basis weight was 90 g / m ² in preparing the nonwoven fabric for the lower layer. A waterproof coating structure using a membrane waterproof sheet was constructed. Table 1 shows the physical properties of the obtained waterproof coating sheet and the evaluation results of the waterproof coating structure.

(Comparative Example 4)
The laminate (synthetic resin film, upper layer nonwoven fabric layer and lower layer nonwoven fabric layer) obtained in the same manner as in Example 2 was used as a coating waterproof sheet (that is, the polyurethane film and adhesive layer were not provided). Further, in the same manner as in Example 1, a waterproof coating structure using the waterproof coating sheet was constructed. Table 1 shows the physical properties of the obtained waterproof coating sheet and the evaluation results of the waterproof coating structure.

(Comparative Example 5)
Apply a 15% concentration polyurethane resin solution to a PET film with a thickness of 12 μm using a solid gravure roll so that the thickness (dry film thickness) is 20 μm, and the surface is a gravure coated PET film with polyurethane. Produced. Next, the surface opposite to the gravure coat surface of this PET film was placed facing the non-woven fabric for lower layer produced in the same manner as in Example 1, and in a semi-molten state between them using a T-die film extruder. Lamination was performed so as to sandwich polyethylene (PE) having a melt index of 7 (g / 10 min), and a laminate in which a PE layer having a thickness of 30 μm was sandwiched between a gravure-coated PET film and a lower nonwoven fabric layer was obtained. The obtained laminate was directly used as a waterproof coating sheet without being subjected to perforation. Further, in the same manner as in Example 1, a waterproof coating structure using the waterproof coating sheet was constructed. Table 1 shows the physical properties of the obtained waterproof coating sheet and the evaluation results of the waterproof coating structure.

  As is clear from Table 1, the waterproof coating sheets of Comparative Examples 1 and 2 use a thermocompression bonding type nonwoven fabric as the upper layer nonwoven fabric, so the tape peeling strength is low, and there is concern about internal breakage due to stress such as earthquakes. It is what is done. Moreover, since the coating weight waterproof sheet of the comparative example 3 has too small fabric weight of a lower layer nonwoven fabric, there exists a concern that deaeration air permeability is bad and air permeability inside a waterproof structure becomes inadequate. Moreover, since the coating-film waterproof sheet of the comparative example 4 is a thing which does not provide the polyurethane film, the finish (appearance) when it is set as a coating-film waterproof structure worsens. Since the coating film waterproof sheet of Comparative Example 5 employs a PET film coated with a gravure polyurethane instead of the polyurethane film and the upper nonwoven fabric, the surface printing is easy to peel off and the tape peeling strength is low. On the other hand, the coating-film waterproof sheet of this invention of Examples 1-3 can avoid the concern and problem which were mentioned above at a stretch.

1: Synthetic resin film 2: Lower layer nonwoven fabric layer 3: Upper layer nonwoven fabric layer (chemical bond nonwoven fabric layer)
4: Adhesive layer 5: Polyurethane film 6: Through hole 10: Coating waterproof sheet 11: Base (concrete)
12: Polyurethane waterproof layer 13: Primer layer 14: Adhesive layer

Claims (7)

A coated waterproof sheet in which a synthetic resin film is sandwiched and integrated with a nonwoven fabric layer, and the nonwoven fabric layer provided in the lower layer of the synthetic resin film has a basis weight of 100 to 500 g / m ² entangled by needle punching or fluid entanglement The nonwoven fabric layer formed on the synthetic resin film is formed of a chemical bond nonwoven fabric, and a polyurethane film is provided on the upper nonwoven fabric layer via an adhesive layer. A characteristic waterproofing sheet. The coated waterproof sheet according to claim 1, wherein the basis weight of the chemical bond nonwoven fabric is 50 to 200 g / m ² .   The coating waterproof sheet according to claim 1 or 2, wherein the synthetic resin film has a thickness of 10 to 100 µm.   The coating film waterproof sheet according to claim 1, wherein the polyurethane film has a thickness of 10 to 100 μm.   The said adhesive bond layer is a coating-film waterproof sheet in any one of Claims 1-4 currently formed with the polyurethane-type adhesive agent.   The coated waterproof sheet according to any one of claims 1 to 5, wherein a large number of holes are formed in a thickness direction, and a total opening ratio of the large number of holes is 40% or less with respect to a surface area.   The coating waterproof sheet according to any one of claims 1 to 6 is laid on the base surface with the polyurethane film side up, and a polyurethane waterproof material layer is formed on the polyurethane film of the coating waterproof sheet A waterproof coating structure characterized by having

Images