JP2008303549A - Underlayer buffer material for coating waterproofing construction, and coating waterproofing construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underlayer buffer material for coating waterproofing construction, which can prevent wrinkles from being formed in a waterproof-agent coating surface, and a coating waterproofing construction method. <P>SOLUTION: This underlayer buffer material 10 is equipped with a three-layer structure laminate in which a synthetic resin film layer B12, a thermocompression-bonded nonwoven fabric layer A11 and a nonwoven fabric layer C13 are integrated together in such a manner that the synthetic resin film B12 is sandwiched between the nonwoven fabric layer A11 and the nonwoven fabric layer C13. The nonwoven fabric layer C13 is confounded with a mass per unit area of 100 g/m<SP>2</SP>or more. In the nonwoven fabric layer A11, a mass per unit area [A] is in the range of >20 g/m<SP>2</SP>and ≤100 g/m<SP>2</SP>, and a ratio of embossed area is 5% or more. In the synthetic resin film layer B, a thickness [B] is in the range of ≥10 μm and <50 μm. Additionally, the mass per unit area [A] and the thickness [B] satisfy the inequality (1): [A]/[B]>2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an undercoat cushioning material for waterproofing construction of a coating film used in waterproofing construction of a coating film, and a coating film waterproofing construction method 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.

  The coating waterproofing work is applied by applying a primer and adhesive (or only adhesive) to the ground surface of concrete, pasting an underlayer cushioning material, and applying a waterproofing agent such as polyurethane on top of this. A waterproof membrane is formed.

  The underlay cushioning material used in this coating waterproofing work was integrated by sandwiching the synthetic resin film layer [II] (intermediate layer) between the long fiber nonwoven fabric layer [I] (upper layer) and the nonwoven fabric layer [III] (lower layer). A three-layer structure laminate has been proposed (for example, Patent Document 1). In this three-layer structure laminate, the synthetic resin film layer [II], which is an intermediate layer, is firmly integrated by partially penetrating into the upper and lower nonwoven fabric layers [I] and [III]. The synthetic resin film layer [II] functions as a water shielding layer. The non-woven fabric layer [III] functions as an air-permeable layer and prevents partial swelling by allowing water vapor generated from the base (for example, concrete) to escape in the horizontal direction. The long fiber nonwoven fabric layer [I] functions to reinforce the waterproofing agent layer while firmly fixing the waterproofing agent layer by partially infiltrating the waterproofing agent applied thereon.

With such an underlayer cushioning material, it is not necessary to strictly adjust the viscosity of the waterproofing agent at the time of waterproofing the coating film, and the finished waterproof layer also swells (a phenomenon in which the waterproof layer partially swells from the base material and swells) ) Can be prevented.
Japanese Patent No. 2605893

  As described above, by using the underlayer cushioning material of Patent Document 1, it is possible to construct a good waterproof coating layer. However, there is a problem that wrinkles often occur on the waterproof coating surface.

  Accordingly, an object of the present invention is to provide an undercoat cushioning material for waterproofing coating film and a method for waterproofing coating film that can prevent wrinkles.

  The present inventors examined the cause of the occurrence of the above-mentioned defects, and found that the following points were the cause.

  In other words, in the waterproof coating construction, the adhesive is applied and the underlayer cushioning material is applied, but the correct construction method is to wait for the solvent in the adhesive to evaporate to some extent after applying the adhesive, and then bond It is a method of sticking with the tack remaining on the agent. However, often, an operation of applying an underlayer cushioning material may be performed before the solvent in the adhesive is sufficiently evaporated. Especially in winter, the solvent is difficult to evaporate due to the low temperature, and the evaporation tends to remain insufficient. In addition, since the viscosity of the adhesive tends to increase due to the low temperature in winter, it may be applied at a lower viscosity by adding a solvent to the adhesive for ease of work. Where it is necessary to evaporate, an underlay cushioning material may be applied without sufficient evaporation.

  In this way, when the underlayer cushioning material is pasted without sufficiently evaporating the solvent in the adhesive, the synthetic resin film layer [II], which is the intermediate layer in the three-layer structure laminate, becomes the solvent (organic solvent) in the adhesive. It was presumed that wrinkles were generated due to the fact that it swelled by absorbing water and swelled uniformly.

  The present inventors examined a solution based on such a cause, and as this solution, the swelling force of the synthetic resin film layer as the intermediate layer and the ability to withstand the swelling force by the nonwoven fabric layer as the upper layer In view of the above, the present inventors have found the invention as described below in which by appropriately defining both layers, the swelling force is suppressed by the nonwoven fabric layer to prevent wrinkling.

Such an underlayer cushioning material for waterproofing construction of a coating film according to the present invention includes an underlay provided with a three-layer structure laminate in which a synthetic resin film layer B is sandwiched between a thermocompression bonding type nonwoven fabric layer A and a nonwoven fabric layer C. It is a buffer material, and the nonwoven fabric layer C has a basis weight of 100 g / m ² or more and is entangled by needle punching or fluid entanglement. The thermocompression bonding type nonwoven fabric layer A has a basis weight of 20 g / m ^2. ultra is a 100 g / m ² or less, the synthetic resin film layer B has a thickness of 10μm or more and less than 50 [mu] m, and satisfies the following formula (1).
[A] / [B]> 2 (1)
[A]: basis weight of the thermocompression bonding type nonwoven fabric layer A (unit: g / m ² )
[B]: Thickness (unit: μm) of the synthetic resin film layer B

  Moreover, the coating film waterproofing construction method according to the present invention comprises applying the adhesive to the base surface, and then applying the adhesive to the undercoat cushioning material for waterproofing the coating, with the thermocompression bonding type nonwoven fabric layer A side as the front side. It arrange | positions on a surface and a waterproofing agent is apply | coated on the said underlay cushioning material arrange | positioned.

  As described above, the underlayer cushioning material of the present invention comprises a three-layer structure laminate in which a synthetic resin film layer B is sandwiched between a thermocompression bonding type nonwoven fabric layer A and a nonwoven fabric layer C, and of these, the nonwoven fabric layer Since A is a thermocompression bonding type nonwoven fabric, the binding force between the fibers is high and the strength in the horizontal direction is relatively high. And even if the synthetic resin film layer B swells by sufficiently thickening the thermocompression bonding type nonwoven fabric layer A with respect to the synthetic resin film layer B so as to satisfy the above formula (1), the thermocompression bonding type nonwoven fabric layer A can withstand this swelling force and prevent generation of wrinkles.

  The thermocompression bonding type nonwoven fabric layer A preferably has an embossed area ratio of 5% or more. Incidentally, the point that the embossed area ratio is 5% or more means that the nonwoven fabric layer A is thermocompression-bonded. If the embossed area ratio is less than 5%, the strength is low, and the swelling due to swelling of the synthetic resin film layer B There is concern that it cannot be prevented. A thermocompression-bonding type nonwoven fabric having a higher embossed area ratio is preferable because the horizontal strength increases and the wrinkle prevention effect increases. Specifically, the embossed area ratio is preferably 7% or more, more preferably 10% or more.

  In addition, if a synthetic resin sheet is used as the layer A instead of a non-woven fabric, the strength in the horizontal direction is high and it can sufficiently withstand the swelling force. However, if the layer A is a non-woven fabric, a waterproofing agent (for example, polyurethane) applied on the layer A partially penetrates the non-woven fabric layer A to firmly fix both, and the synthetic resin film layer B and the anchor effect of the non-woven fabric layer A Since the layer B is firmly fixed by (part of the layer B comes into the nonwoven fabric layer A), the nonwoven fabric is adopted.

By the way, even if the nonwoven fabric layer A is simply thickened, the wrinkles are difficult to move. However, in the case of thick materials, the nonwoven fabric layer A absorbs a lot of waterproofing agent such as polyurethane applied on the nonwoven fabric layer A. This is not preferable because the amount of use increases and the cost increases. Therefore, the basis weight of the thermocompression bonding type nonwoven fabric layer A is set to 100 g / m ² or less as described above. More preferably, the basis weight is 80 g / m ² or less.

  The thickness of the synthetic resin film layer B is less than 50 μm as described above. If the synthetic resin film layer B is too thick, the swelling force due to the solvent of the adhesive becomes very high. For this reason, the thermocompression bonding type nonwoven fabric layer A may not be able to resist the swelling force. From the viewpoint of satisfying the upper limit of the basis weight of the type nonwoven fabric layer A and the above formula (1), the thickness of the synthetic resin film layer B is set to less than 50 μm. More preferably, it is less than 40 μm.

  On the other hand, if the thickness of the synthetic resin film layer B is too thin, there is a concern that pinholes are generated. A function of the synthetic resin film layer B is to prevent a waterproofing agent (for example, urethane) applied on the thermocompression bonding type nonwoven fabric layer A from penetrating into the nonwoven fabric layer C. May reach the nonwoven fabric layer C and impair the air permeability of the nonwoven fabric layer C. For this reason, the thickness of the synthetic resin film layer B is set to 10 μm or more. Preferably it is 20 micrometers or more, More preferably, it is 25 micrometers or more, More preferably, it is 30 micrometers or more.

  In addition, the measuring method of the thickness of the synthetic resin film layer B is as follows. That is, first, a test piece is sampled from 20 arbitrary portions of the underlayer cushioning material. 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 photograph taken, the film portion (synthetic resin film layer B) existing between the thermocompression bonding type nonwoven fabric layer A and the nonwoven fabric layer C is measured with a caliper, and the film is obtained by converting the photographic magnification at the time of photographing. Find the thickness. The obtained 20 film thicknesses (respective film thicknesses in the 20 test pieces) are averaged to obtain the thickness of the synthetic resin film layer B. In measuring with a caliper, the film portions entering the upper and lower nonwoven fabrics (thermocompression-type nonwoven fabric layer A and nonwoven fabric layer C) are measured as ends. Further, when there is a concern that the shape of the cross section changes during the cutting, in order to suppress the shape change, the underlay cushioning material is frozen using a quick freezing device and then cut. Incidentally, since the synthetic resin film layer B is formed so as to bite into the thermocompression bonding type non-woven fabric layer A and the non-woven fabric layer C in the production process, the synthetic resin film layer B has irregularities on both sides. It becomes. Therefore, the thickness measurement method is adopted as described above, and the present invention is defined by this value.

From the viewpoint of satisfying the above formula (1) in relation to the lower limit of the thickness of the synthetic resin film layer B as described above, the basis weight of the thermocompression bonding type nonwoven fabric layer A is set to exceed 20 g / m ² . As long as the above formula (1) is satisfied in this way, the thermocompression bonding type nonwoven fabric layer A can withstand the swelling force of the synthetic resin film layer B, and wrinkle generation can be prevented.

  More preferably, [A] / [B] is 3.0 or more for the formula (1) that defines the relationship between the thermocompression bonding type nonwoven fabric layer A and the synthetic resin film layer B. This is because the thicker the thermocompression bonding type nonwoven fabric layer A with respect to the synthetic resin film layer B, the higher the wrinkle prevention effect.

The nonwoven fabric layer C is entangled by needle punching or fluid entanglement method (for example, water punching) as described above. With such a non-woven fabric layer C, the air permeability in the horizontal direction is good, and water vapor generated from the base can be released well. Moreover, the fabric weight of the nonwoven fabric layer C needs to be 100 g / m < ² > or more from a viewpoint of making air permeability favorable. This is because a material with a small basis weight is too thin and air permeability is poor. More preferably, the basis weight is 160 g / m ² or more. In manufacturing a nonwoven fabric layer entangled by needle punching or fluid entanglement method, it may be weakly embossed (hereinafter sometimes referred to as pre-embossing) to prevent the fibers from falling apart immediately after spinning. Then, by the subsequent needle punch or fluid entanglement, the thermal bonding point by the pre-embossing is almost removed, and the horizontal air permeability is hardly hindered.

  Assuming that the swelling force of the synthetic resin film layer B is suppressed by the lower nonwoven fabric layer C, the nonwoven fabric C entangled by the needle punch or fluid entanglement method as described above is strong enough to suppress the swelling force. There is a shortage. Therefore, if measures such as making a non-woven fabric layer C to be thermocompression-bonded to increase the strength, the horizontal breathability is reduced, and the original function (water vapor generated from the ground by horizontal ventilation, etc.) This results in a loss of the function of escaping. For this reason, the nonwoven fabric layer C is not subjected to the action of suppressing the swelling force of the synthetic resin film layer B, but the upper thermocompression bonding type nonwoven fabric layer A can withstand the swelling force.

  Thus, the present invention balances the thermocompression-bonding type nonwoven fabric layer A, the synthetic resin film layer B, and the nonwoven fabric layer C from various viewpoints, and realizes the original functions (waterproof function of layer B, air permeability function of layer C, anchor of layer A). Function, etc.), and prevention of wrinkles.

  Furthermore, in the present invention, from the viewpoint of withstanding the swelling force of the synthetic resin film layer B, the thermocompression bonding type nonwoven fabric layer A is preferably made of a long fiber nonwoven fabric. Compared to short fiber nonwoven fabrics, long fiber nonwoven fabrics are more tensioned and have better horizontal strength (because they are continuous fibers, and have a higher binding force between fibers against horizontal movement), and resistance to wrinkle generation Because it is expensive.

  The undercoat cushioning material for waterproof coating construction according to the present invention may be formed with through holes dispersed or may not be formed. The total aperture ratio is preferably 40% or less with respect to the surface area. By providing a through hole in the underlayer cushioning material, a waterproofing agent (for example, urethane) can be directly bonded to the base, which is preferable from the viewpoint of bonding strength. However, the fact that the total opening ratio of the underlayer cushioning material is high also means that the total opening ratio of the thermocompression bonding type nonwoven fabric layer A is high, so that the strength in the horizontal direction is lowered. For this reason, the ability to withstand the swelling force of the synthetic resin film layer B is reduced, which is not preferable from the viewpoint of wrinkle prevention. Therefore, the total aperture ratio is 40% or less as described above. In addition, that the total opening ratio is high means that the area ratio occupied by the nonwoven fabric layer C, which is a ventilation layer, is also low, that is, the area of the ventilation portion is reduced. From this viewpoint, the total opening ratio is too high. It is not preferable.

  According to the underlayer cushioning material for coating film waterproofing construction and the coating film waterproofing construction method according to the present invention, even if the construction is performed without sufficiently evaporating the solvent in the adhesive, the waterproof coating surface is protected. Hardly occurs.

  FIG. 1 is a cross-sectional view showing a state in which an undercoat cushioning material for waterproofing coating construction according to Embodiment 1 of the present invention is applied to a concrete (base) surface.

  The underlay cushioning material 10 of Embodiment 1 is formed of a three-layer structure laminate in which a synthetic resin film layer B12 is sandwiched between a thermocompression bonding type nonwoven fabric layer A11 and a nonwoven fabric layer C13.

  First, a method for obtaining the underlayer cushioning material 10 as a three-layer structure laminate will be described.

  Examples of this method include a lamination method such as an extrusion lamination method (extrusion lamination method) and a dry lamination method, or a method of laminating and integrating by a coating method.

  Specifically, for example, a thermocompression bonding type non-woven fabric layer A11 and a non-woven fabric layer C13 are prepared in advance, and a raw material for the synthetic resin film layer B12 in a molten or semi-molten state between the thermocompression bonding type non-woven fabric layer A11 and the non-woven fabric layer C13. And a method of laminating while extruding (sand rami method by extrusion lamination method). In particular, according to this method, the synthetic resin film layer B12 is solidified so that it is excellent in productivity and a part of the synthetic resin film layer B12 penetrates into each part of the thermocompression bonding type nonwoven fabric layer A11 and the nonwoven fabric layer C13. B12 and the thermocompression bonding type nonwoven fabric layer A11, the synthetic resin film layer B12 and the nonwoven fabric layer C13 are firmly fixed.

  Next, the synthetic resin film layer B12 in the underlay cushioning material 10 will be described. Examples of the material of the synthetic resin film layer B12 include polyolefin films such as polyester films, polyamide films, polypropylene films, and polyethylene films, and films of these copolymers. In addition, many general-purpose synthetic resin films such as ethylene vinyl alcohol copolymer resin (hereinafter sometimes referred to as EVOH), ethylene, and vinyl acetate polymer (hereinafter sometimes referred to as EVA) may be used. it can.

  However, in selecting a material for the synthetic resin film layer B12, it is necessary to consider the waterproofing agent applied on the underlayer cushioning material 10 and its interaction with the solvent (dissolution resistance, adhesion, etc.). In addition, it is desirable to have an appropriate rigidity and strength in consideration of the workability at the time of forming the three-layer structure laminate and the handleability during construction. As the waterproofing agent, a urethane-based resin or a polyester-based resin is generally used, and a polyolefin-based film is preferable from the viewpoints of the interaction and the rigidity and strength.

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

  The thickness of the synthetic resin film layer B is 10 μm or more (preferably 20 μm or more) and less than 50 μm (preferably less than 40 μm). In addition, since the synthetic resin film layer B becomes the shape which digged into the thermocompression bonding type nonwoven fabric layer A and the nonwoven fabric layer C as mentioned above, it will be in the state by which the unevenness | corrugation was formed in both front and back. Therefore, the thickness said here means the thickness measured according to the above-mentioned thickness measuring method.

  Next, the thermocompression bonding type nonwoven fabric layer A11 will be described. Examples of the material of the thermocompression bonding nonwoven fabric layer A11 include polyester fibers, polyamide fibers, and polypropylene fibers, and these thermoplastic fibers may contain glass fibers. Polyester spunbond and polyvinyl alcohol spunbond by tow opening can be preferably used. Multicomponent composite fibers may be used for the purpose of enhancing thermal adhesiveness. For example, polyethylene terephthalate (hereinafter sometimes referred to as PET) is used as a core, and polyethylene (hereinafter sometimes referred to as PE) is used as a sheath. The core-sheath composite fiber, the core-sheath composite fiber (hereinafter sometimes referred to as CO-PET) having PET as the core and the low melting point polyester as the sheath, or polypropylene (hereinafter, sometimes referred to as PP). ) As a core and a core-sheath composite fiber having a polyethylene sheath as the core. Of these, polyester spunbond is more preferred.

  The fibers of the thermocompression bonding type nonwoven fabric layer A11 may be either short fibers or long fibers, but the long fibers are more preferable because they can provide a higher strength when used as a nonwoven fabric.

  The embossed area ratio of the thermocompression bonding type nonwoven fabric layer A11 is 5% or more. The embossed area ratio may be 100%. In this case, since the surface is uneven, the synthetic resin film layer B partially bites into the thermocompression type nonwoven fabric layer A because the surface is uneven. Thus, both layers can be firmly fixed. Even when a waterproofing agent (for example, urethane) is applied onto the thermocompression bonding type nonwoven fabric layer A11, the waterproofing agent bites into the thermocompression bonding type nonwoven fabric layer A and is firmly fixed.

  Incidentally, the thermocompression bonding type non-woven fabric layer A of the present invention does not become a film like paper even if the embossed area ratio is 100%, and refers to a thermocompression bonding type as a non-woven fabric to the last, It has suppleness and unevenness due to a large number of fibers. The thermocompression bonding type is one in which fusion occurs at the contact point between fibers by thermocompression bonding and the strength is improved.

The basis weight of the thermocompression bonding type nonwoven fabric layer A11 is more than 20 g / m ² and 100 g / m ² or less. Although it does not specifically limit as thickness of thermocompression bonding type nonwoven fabric layer A11, Since the upper limit of a fabric weight is 100 g / m < ² > and it is a thermocompression bonding type, it does not become so thick as much and is 1.5 mm or less. Degree.

  Next, the nonwoven fabric layer C13 will be described. Examples of the material for the nonwoven fabric layer C13 include glass-based short fibers, polyester-based fibers, polyamide-based fibers, polypropylene-based fibers, polyester spunbond by tow opening, and polyvinyl alcohol spunbond. In particular, when the base is concrete, it is preferable to have excellent alkali resistance, and in view of this point, an acrylic fiber nonwoven fabric is preferable.

The nonwoven fabric layer C13 is entangled by needle punching or fluid entanglement method, and has a basis weight of 100 g / m ² or more, whereby good air permeability can be realized. From the viewpoint of improving air permeability, the weight per unit area is more preferably 160 g / m ² or more. On the other hand, the upper limit of the basis weight of the nonwoven fabric layer C13 is preferably 300 g / m ² . This is because if the basis weight is too high, the mass of the underlayer cushioning material 10 becomes heavy and the workability decreases. More preferably, it is 250 g / m ² or less.

  The fibers of the nonwoven fabric layer C13 may be either long fibers or short fibers, but are preferably long fibers from the viewpoint of strength.

  The nonwoven fabric layer C13 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 with the base” (pages 340 to 342)] of 10 mmAq. The outflow amount is preferably 170 cc or more when pressurized air. This is because if it is 170 cc or less, the air permeability is poor, which may cause the waterproof surface to bulge or rise.

Using the synthetic resin film layer B12, the thermocompression bonding type nonwoven fabric layer A11, and the nonwoven fabric layer C13 as described above, a three-layer structure laminate is obtained by the extrusion laminating method or the like, and is used as the underlayer cushioning material 10. Under the present circumstances, about synthetic resin film layer B12 and thermocompression bonding type nonwoven fabric layer A11, each layer is set so that Formula (1) may be satisfied.
[A] / [B]> 2 (1)
[A]: basis weight of the thermocompression bonding type nonwoven fabric layer A (unit: g / m ² )
[B]: Thickness (unit: μm) of the synthetic resin film layer B

  Further, through holes may be dispersedly formed in the obtained underlay cushioning material 10. At this time, the total aperture ratio is set to 40% or less with respect to the surface area.

  Next, a construction method using the underlayer cushioning material 10 will be described (FIG. 1).

  In the construction, first, the primer 15 is applied to the lower ground of the concrete 17 or the like (the primer 15 may be omitted depending on the material of the base), and then the adhesive 14 is applied. Next, the underlay cushioning material 10 is arranged on the adhesive 14 application surface so that the thermocompression bonding type nonwoven fabric layer A11 side is the front side, that is, the nonwoven fabric layer C13 side is adhered to the adhesive 14. Thereafter, a waterproofing agent 16 such as polyurethane is applied from above the underlay cushioning material 10 (that is, from above the thermocompression bonding type nonwoven fabric layer A11). The waterproofing agent 16 is cured and the construction is completed.

  In the case of using the underlay cushioning material 10, the swelling of the synthetic resin film layer B <b> 12 by the solvent of the adhesive 14 even if the underlay cushioning material 10 is adhered before the solvent of the adhesive 14 is sufficiently evaporated. The thermocompression-bonding type non-woven fabric layer A11 prevents wrinkles from occurring, and wrinkles do not appear on the finished waterproofing agent 16 layers.

  In addition, in the said embodiment, although the underlay cushioning material 10 which consists of a three-layer structure laminated body of thermocompression bonding type nonwoven fabric layer A11, synthetic resin film layer B12, and nonwoven fabric layer C13 was shown, it is four or more layers containing this three-layer structure laminated body It is also possible to use a cushioning material for the underlay.

  Hereinafter, the present invention will be described in more detail with reference to experimental examples.However, the present invention is not limited by the following examples as a matter of course, and is implemented with appropriate modifications within a range that can meet the purpose described above and below. Of course, any of these is also included in the technical scope of the present invention.

"Evaluation methods"
First, various evaluation methods in the following experimental examples will be described. Hereinafter, with respect to the sample direction, the machine direction (manufacturing flow direction at the time of manufacturing the nonwoven fabric) is referred to as MD direction, and the direction orthogonal to the machine direction is referred to as CD direction.

<Weight per unit (mass per unit area)>
Obtained according to JIS-L1906. Specifically, five test pieces of 20 cm square 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 ³ is converted to the mass per unit area (g / m ² ).

<Thickness>
Obtained according to JIS-L1906. Specifically, the pressure condition is measured at 1.96 kPa (20 gf / cm ³ ) at 10 points per 1 m of the full width of the test piece in the CD direction, and the average value of these is calculated to obtain the thickness.

<Strong>
Samples are punched into 5 cm × 20 cm strips in the vertical and horizontal directions, and the samples are respectively measured according to JIS L1906 5.3.1. In this measurement, a Tensilon tensile tester is used, and the tension applied at the time of breaking is set to be vertical and horizontal direction N = 5.

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

<Water impermeability>
According to the test method according to DIN-16935 in "General Standards for Performance Evaluation of Roof Waterproof Systems" (translation, Koike Laboratory, Institute of Materials Research, Tokyo Institute of Technology, Kobunsha) 5.1.4 Water Pressure Resistance Test (Pages 8-9) taking measurement.

<Acupuncture test>
Apply an adhesive (chloroprene-based adhesive) to the concrete base so that the amount is 0.4 kg / m ^2, and immediately apply an underlayer cushioning material with the thermocompression-bonding type non-woven fabric layer A on the front side. Apply waterproofing agent (Chemical Formula 1 below) to 1 kg / m ^2, and then apply the same urethane waterproofing agent again to 1 kg / m ² (the total of urethane waterproofing agent is 2 kg / m ^2). ).

  After the urethane waterproofing agent is cured, the construction surface is visually observed to determine the presence or absence of wrinkles.

《Method for producing underlay cushioning material in experimental example》
Next, a method for producing the underlayer cushioning material of each experimental example will be described.

<Experiment Nos. 1-6, 8-12>
Spinning was performed using PET with an intrinsic viscosity of 0.68 at a spinning temperature of 285 ° C., with a nozzle diameter of 0.35 mm and a single hole discharge rate of 2.5 g / min and a take-up speed of 4800 m / min. . Next, this spunbonded nonwoven fabric was embossed at a dot interval of 5 mm, an embossed area ratio of 11%, a linear pressure of 50 kN / m, and 240 ° C. to obtain a thermocompression bonding type nonwoven fabric layer A (thermocompression bonding type spunbonded nonwoven fabric). . The basis weight of each thermocompression bonding type nonwoven fabric layer A is as shown in Table 1.

  On the other hand, a web composed of 4.4 dtex (4 denier) PET filament was obtained by the spunbond method under the same conditions as described above, and this web was obtained by using an FPD1-40S made by Organ Co., with a needle depth of 13 mm and a density of 80 N. Needleing was performed at / cm to obtain a nonwoven fabric layer C (needle punch type spunbond nonwoven fabric) having a basis weight shown in Table 1.

  Next, using a T-die film extruder, a semi-molten PE (melt index: 7) (Experiment Nos. 1 to 5, 8 to 12) or PBT between the thermocompression-bonding type nonwoven fabric layer A and the nonwoven fabric layer C is used. (Experiment No. 6) is laminated so that the synthetic resin film layer B (the layer of PE or PBT (polybutylene terephthalate)) having the thickness shown in Table 1 is formed on the nonwoven fabric layer A and the nonwoven fabric layer C. A three-layer structure laminate sandwiched and integrated was obtained. In Experiment Nos. 1, 2, 4 to 6, 8 to 10, this three-layer structure laminate is an underlayer cushioning material.

  For Experiment Nos. 3, 11, and 12, further, a perforated machine was used to make a round hole (diameter 6 mm) at intervals of 4 cm in length and breadth to obtain a perforated type underlay cushioning material.

<Experiment No. 7>
A 2-component core-sheath fiber (CO-PET fiber) with a cut length of 56 mm at 2.2 dtex (2 denier) and a PET fiber with a cut length of 56 mm at 2.2 dtex (2 denier) are blended at a blending ratio of 50/50. The staple fiber was formed into a web using a card and a cross wrapper as usual. Next, thermal embossing is performed on this web at a dot spacing of 5 mm, an embossed area ratio of 11%, 140 ° C., and a linear pressure of 50 kN / m to form a thermocompression bonding type nonwoven fabric layer A (thermal bond nonwoven fabric) having a basis weight of 70 g / m ^2. Obtained.

On the other hand, a 4.4 dtex (4 denier) cut length 56 mm acrylic fiber and a 4.4 dtex (4 denier) cut length 56 mm PET fiber were blended at a blend ratio of 50/50, and the staple fiber was carded and clothed as usual. A web was formed using a wrapper. The web was needled at a needle depth of 13 mm and a density of 80 N / cm using Organ Corp. FPD1-40S to obtain a nonwoven fabric layer C (short fiber needle punched nonwoven fabric) having a basis weight of 160 g / m ² .

  Next, using a T-die film extruder, lamination is performed so that a semi-molten PE (melt index: 7) (which becomes the synthetic resin film B layer) is sandwiched between the thermocompression-bonding type nonwoven fabric layer A and the nonwoven fabric layer C. The three-layer structure laminated body which processed and integrated the synthetic resin film B layer with a thickness of 30 micrometers between the nonwoven fabric layer A and the said nonwoven fabric layer C was obtained, and it was set as the underlay cushioning material.

《Waterproofing method》
After applying an adhesive (chloroprene-based adhesive: Nogawa Chemical Co., Ltd., trade name: DC644G) to 0.4 kg / m ^{2 on the} concrete (base) surface, Affixing was performed so that the thermocompression bonding type nonwoven fabric layer A was on the front side and the nonwoven fabric layer C was on the adhesion side. Next, a general-purpose urethane waterproofing agent for flat field was applied from above to 1 kg / m ^2, and after curing, the urethane waterproofing agent for flat field was applied again at 1 kg / m ² (total 2 kg / m 2). ² ). After the overcoated waterproofing agent was cured, a urethane waterproofing agent for topcoat containing an ultraviolet absorber or the like was applied at 0.3 kg / m ² . A waterproof layer was thus formed.

  Regarding the waterproof layer constructed as described above, no wrinkles or the like occurred on the surface of the waterproof layer in Experiment Nos. 1 to 7 and 11. In experiment No. 7 of these, small wrinkles were seen in some cases after the underlayer cushioning material was applied to the adhesive-coated surface, but wrinkles were visible on the surface after the urethane waterproofing agent was applied. It was gone. Further, when the experiment No. 1 to 7 was investigated after one month, the waterproof layer did not swell or float. Furthermore, when a survey was conducted for one year thereafter, there was no abnormality and a good condition was maintained. When experiment No. 11 was investigated three years later, a slight lifting occurred in the waterproof layer. This is probably because the air permeability of the nonwoven fabric layer C in the underlay cushioning material was slightly inferior.

  On the other hand, in Experiment Nos. 8 to 10 and 12, wrinkles occurred on the surface after the urethane waterproofing agent was applied.

It is sectional drawing showing a mode that the underlay cushioning material for coating-film waterproofing construction concerning Embodiment 1 of this invention was constructed | assembled on the concrete (base | substrate) surface.

Explanation of symbols

10 Underlay cushion material 11 Thermocompression bonding type nonwoven fabric layer A
12 Synthetic resin film layer B
13 Nonwoven fabric layer C
14 Adhesive 15 Primer 16 Waterproofing agent 17 Concrete

Claims (4)

An underlay cushioning material comprising a three-layer structure laminate in which a synthetic resin film layer B is sandwiched between a thermocompression bonding type nonwoven fabric layer A and a nonwoven fabric layer C,
The nonwoven fabric layer C has a basis weight of 100 g / m ² or more and is entangled by a needle punch or fluid entanglement method,
The thermocompression bonding type nonwoven fabric layer A has a basis weight of more than 20 g / m ² and 100 g / m ² or less,
The synthetic resin film layer B has a thickness of 10 μm or more and less than 50 μm,
An underlayer cushioning material for waterproofing coating film, characterized by satisfying the following formula (1).
[A] / [B]> 2 (1)
[A]: basis weight of the thermocompression bonding type nonwoven fabric layer A (unit: g / m ² )
[B]: Thickness (unit: μm) of the synthetic resin film layer B   The underlayer cushioning material for waterproofing a coating film according to claim 1, wherein the thermocompression bonding type nonwoven fabric layer A is made of a long-fiber nonwoven fabric.   The undercoat cushioning material for waterproofing coating film according to claim 1 or 2, wherein through-holes are dispersedly formed in the undercoat cushioning material for waterproofing coating film, and the total opening ratio is 40% or less with respect to the surface area. After applying adhesive on the ground,
The underlay cushioning material for waterproofing construction of a coating film according to any one of claims 1 to 3, with the thermocompression bonding type nonwoven fabric layer A side as a front side, disposed on the adhesive application surface,
A method of waterproofing a coating film, wherein a waterproofing agent is applied on the placed cushioning material.

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