JP6113948B2 - Waterproof structure for building foundation and building constructed with the structure - Google Patents

Description

The present invention relates to a waterproof structure for a building, and more specifically, a waterproof structure for a building foundation (underlaying material) which is one of exterior materials of a building having waterproof properties (particularly a roof of a house), and the same It relates to the building where the construction was done.

In general, the roof of a house is called a small roof group, and is constructed by sequentially constructing a roof plate material (upper frame material) such as a base plate, a lower frame material, and a tile on an inclined frame. In this case, waterproofing of the roof is performed by a double structure of the roof covering material and the lower covering material. Usually, the lower brazing material is fixed to a base plate or the like using nails (including staples).

Patent Document 1 states that “as an underlaying material for roofs that has excellent water-proof and nail-hole water resistance, the synthetic resin film layer, the adhesive resin layer, and the water-absorbing polymer layer absorb water from the upper layer to the lower layer. "Waterproof roof underlay material laminated in order of swelling layer and non-woven fabric layer" is described.

Patent Document 2 states that “a non-woven fabric having a water-absorbing swelling layer made of a water-absorbing polymer resin is sandwiched between two synthetic resin films as a waterproof sheet for building foundations that is excellent in water-stopping performance even when nails are struck during construction. Sheet of multilayered structure ".

Patent Document 3 describes “a roofing material made of a laminate having a slip-proof layer, a moisture-permeable waterproof layer, and an adhesive”.

JP 2006-177106 A JP 2009-84840 A JP 2005-113678 A

The conventional roof underfloor material of a house is a type of sheet having a water-absorbing swell layer, and it is accompanied by a large number of through holes because the sheet is fixed to a field material etc. exclusively with nails, and also has a type of adhesive. In the sheet, since the sheet does not have a water-absorbing swelling layer, both of them are insufficient in waterproofness required as a roof covering material, and improvement thereof has been demanded.

In order to solve the above problems, as one aspect of the present invention, there is provided a waterproof structure 1 for a building foundation having a waterproof film layer and a water-absorbing swelling layer, the water-absorbing swelling layer containing water-absorbing particles and an adhesive. The waterproof structure 1 for building foundations provided by the lower surface side of the said waterproof film layer is provided.

As another aspect, the building which constructed the said waterproofing structure for building foundations is provided.
As yet another aspect, a method for constructing the waterproof structure for a building foundation on a building is provided.

The waterproof structure for building foundations of the present invention can reduce the use of nails (including staples) as much as possible when constructing the roof of the waterproof structure for foundations, and can sufficiently prevent water leakage at the nail hole locations and the nail holes for water leakage. The spread of wetness to the surroundings can be minimized.

FIG. 1 is a perspective view showing a configuration of a building (a roof of a house) in which a waterproof structure for a building foundation according to the present invention is constructed. FIG. 2 is a cross-sectional view showing a configuration of a fixing portion when the waterproof structure for a building foundation according to the present invention is fixed to a field material on a roof of a house with nails (including staples). FIG. 3 is a cross-sectional view showing a configuration of an example of a waterproof structure for a building foundation according to the present invention. FIG. 4 shows a waterproof film layer, a water-absorbing swelling layer (adhesive, water-absorbing particles) and a nail of a waterproof structure for a building foundation when a waterproof structure for a building foundation according to the present invention is passed through a nail (tucker). It is a schematic cross section which shows a contact relationship. Here, FIG. (A) is a schematic cross-sectional view. 4B and 4C are both schematic bottom cross-sectional views taken along the cutting line XX in FIG. 4A. Among these, FIG. 4B shows water absorption. FIG. 4C is a schematic cross-sectional view showing a situation after the water-absorbing particles have absorbed moisture. FIG. 5 is a cross-sectional view of the waterproof structure for building foundations according to the present invention in which an adhesive layer is further provided on the lower side of the water-absorbing swelling layer in the waterproof structure for building foundations shown in FIG. 6A and 6B are diagrams illustrating the shape of the production test sample, in which FIG. 6A is a top view, and FIG. 6B is cut along the cutting line YY in FIG. 6A. FIG. FIG. 7: is sectional drawing which shows typically the manufacturing process in embodiment of the waterproof film manufacturing method of the waterproof structure for building foundations concerning this invention. FIG. 8: is sectional drawing which shows typically the manufacturing process of the waterproof structure for building foundations concerning this invention. FIG. 9: is sectional drawing which shows the coating pattern of the adhesion composition of the waterproof structure for building foundations concerning this invention.

Next, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and the general knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that design changes, improvements, and the like can be made as appropriate based on the above.

FIG. 1 shows an example of the structure of a building on which the waterproof structure 1 for building foundation according to the present invention is constructed, specifically, a roof 200 of a house. As shown in FIG. 1, a roof 200 of a house is usually constructed by overlaying a waterproof structure for building foundation 1 on the entire surface of a field board as a lower covering material for waterproofing on a field board 50, and further waterproofing structure for a building foundation. The pier 54 is arranged almost at the full width of 1, and further, a plurality of roof tiles 56 and the like are stacked as an upper frame material for waterproofing and fireproofing.

In this case, as shown in FIG. 2, the tile 56 is fixed to the pier 54 using nails (including staples) 58, or the base plate 50 and the rafter through the pier to prevent the roof 56 from sliding down from the inclined roof. It is directly fixed to 52. At that time, the waterproof structure 1 for building foundation is provided with a plurality of through holes due to nailing or the like.

FIG. 3 shows one embodiment of the waterproof structure for a building foundation according to the present invention. As shown in FIG. 3, the waterproof structure 1 for a building foundation is configured as a multilayer laminate including at least a waterproof film layer 10 as an upper layer and a water-absorbing swelling layer 20 including a water-absorbent particle 24 and an adhesive 22 as a lower layer. . That is, in this multilayer laminate, the water-absorbing swelling layer can be provided on the lower surface side of the waterproof film layer in contact with the waterproof film layer, or can be provided on the lower surface side of the waterproof film layer via another layer.

In the water-absorbing swelling layer 20, the water-absorbing particles 24 are dispersed in the pressure-sensitive adhesive, and constitute a pressure-sensitive adhesive and a pressure-sensitive adhesive composition.

For example, in the water-absorbing swelling layer 20, an acrylic pressure-sensitive adhesive can be used as the pressure-sensitive adhesive 22, and water-absorbing particles having sodium polyacrylate can be used as the water-absorbing particles 24. In this case, the water-absorbing swelling layer 20 is formed by dissolving the pressure-sensitive adhesive 22 using an organic solvent (for example, toluene, ethyl acetate) to form a solution, and then adding the water-absorbing particles 24 to the solution. A liquid is prepared, and then the coating liquid is applied onto the waterproof film layer 10 by a method such as printing and then dried. In this case, the water-absorbing particles 24 exist in a dispersed state without being compatible with each other in the pressure-sensitive adhesive. Therefore, when the waterproof structure 1 for building foundation is fixed to the field material 50 or the like with the nail 58, if the thickness of the water-absorbing swelling layer and the dispersion of the water-absorbing particles are suitable, the inside of the nail hole of the water-absorbing swelling layer The surface of the water-absorbing particles can be exposed on at least a part of the peripheral surface.

FIG. 4 schematically shows the relationship between the nail 58 and the water-absorbing particles 24 when the nail 58 is driven into the waterproof structure 1 for building foundations. FIG. 4A shows a cross-sectional state in the thickness direction of the waterproof structure 1 for building foundation when nails are driven into the waterproof structure 1 for building foundation, and FIGS. 4B and 4C show the building foundation. It is the cross section which cut | disconnected the cross section of the thickness direction of the waterproof structure 1 for cut | disconnections by the cutting line XX, Comprising: The state before and behind the water absorbing particle 24 in an adhesive absorbs a water | moisture content, respectively is shown.

As shown in FIG. 4B, the water-absorbing particles 24 exist in an “island in the sea” state in the adhesive 22. As the nail 58 is driven, the water-absorbing particles present in the nail hole move in the adhesive from the nail hole part to the outer peripheral surface part of the nail (indicated by arrows), and are present at a higher density on the outer peripheral surface part of the nail. Will do. As a result, when water is transmitted along the outer peripheral surface of the nail, the water-absorbing particles absorb water and expand as shown in FIG. As a result, the water-absorbent particles 24 reliably fill the gaps between the inner peripheral surface of the nail hole and the outer peripheral surface of the nail provided in the waterproof structure 1 for building foundations, and prevent the building foundation after nailing. It is useful for maintaining the waterproof property (characteristic that does not cause water leakage) of the waterproof structure 1 for water.

In other words, the use of the water-absorbing particles 24 in the pressure-sensitive adhesive 22, that is, the use in a so-called “sea island” state generally covers the surface of the water-absorbing particles 24 with the pressure-sensitive adhesive 22. Since water cannot absorb water, the water-stopping effect of the water-absorbing particles 24 is deteriorated. Therefore, the use of the water absorbent particles 24 in the adhesive 22 is not generally performed. However, in the present invention, the water-stopping action of the water-absorbing particles 24 is very effective and can be exposed by the interaction with the nail 58 as shown in FIG.

By the way, the thickness of the water-absorbing swelling layer and the ratio of the water-absorbing particles in the pressure-sensitive adhesive are the water-stopping properties required from the relationship between them, the coating properties of the pressure-sensitive adhesive composition containing the water-absorbing particles and the pressure-sensitive adhesive, and film-forming properties. The final decision is taken into account.

Specifically, the coating amount of the pressure-sensitive adhesive composition of the water-absorbing swelling layer 20 is 10 g / m ² or more, more preferably 20 g / m ² or more, more preferably 500 g / m ² or less, more preferably in terms of the solid content of the pressure-sensitive adhesive composition. Is 300 g / m ² or less, most preferably 100 g / m ² or less.

Further, the amount ratio of the water-absorbent particles in the pressure-sensitive adhesive is 5 parts by mass or more, more preferably 10 parts by mass or more, and 50 parts by mass or less per 100 parts by mass of the pressure-sensitive adhesive in solids (solid content 100%). More preferably, it is 40 parts by mass or less.
If the application amount of the pressure-sensitive adhesive of the water-absorbing swelling layer 20 is in the above range, the pressure-sensitive adhesive composition can be uniformly applied to the waterproof film layer 10, and the formed water-absorbing swelling layer 20 is difficult to peel from the waterproof film layer 10, This is because the water-stopping effect of the through hole due to the nailing of the waterproof structure for building foundation caused by the water-absorbing action of the water-absorbent particles 24 can also be expected.

If the amount ratio of the water-absorbing particles 24 in the pressure-sensitive adhesive 22 is within the above range, the pressure-sensitive adhesive composition can be uniformly applied to the waterproof film layer, and the waterproof structure for a building foundation resulting from the water-absorbing action of the water-absorbing particles. This is because the water-stopping effect of the through hole due to nailing can be expected, and the adhesive force of the pressure-sensitive adhesive composition can be secured.

The case where particles having sodium polyacrylate are used as the water-absorbing particles 24 has been described above as an example, but the same applies to the water-absorbing particles 24 described below.

The water-absorbing particles 24 suitable for use in the water-absorbing swelling layer 20 are not particularly limited, and known water-absorbing particles 24 can be used. For example, not only the above-mentioned particles having sodium polyacrylate, but also particles having an acrylic acid-vinyl alcohol copolymer, particles having a sodium polyacrylate cross-linked body, particles having a starch-acrylic acid graft copolymer, isobutylene -Particles having maleic anhydride copolymer and saponified product thereof, particles having polyaspartic acid, and the like can be used. Among these particles, particles having sodium polyacrylate are most preferable because the water absorption of sodium polyacrylate is as large as 100 to 1000 times its own weight.

The average particle diameter of the water-absorbing particles 24 to be used is usually preferably about 10 μm to 500 μm. If the water-absorbing particles are smaller than 10 μm, it is difficult to uniformly disperse in the pressure-sensitive adhesive. If the water-absorbing particles are larger than 500 μm, it is easy to detach from the water-absorbing swollen layer 20 and it is difficult to ensure uniform water absorption.

In the case where larger particles are used as the water-absorbing particles 24, as shown in FIG. Adhesive strength can be increased without causing grain loss.

The pressure-sensitive adhesive 22 suitable for use in the water-absorbing swelling layer 20 includes a pressure-sensitive adhesive having a natural rubber resin, a pressure-sensitive adhesive having a synthetic (SBR, SIS, etc.) rubber-based resin, a pressure-sensitive adhesive having a silicone-based resin, and an acrylic resin. Can be used, a pressure-sensitive adhesive having a polyethylene resin, and the like. In particular, when using particles having polyacrylic acid sodium (water-absorbing resin particles) as the water-absorbing particles 24, the viewpoint of achieving uniform dispersion in the pressure-sensitive adhesive, etc., and improving the weather resistance of the pressure-sensitive adhesive composition, materials It is preferable to use a pressure-sensitive adhesive having an acrylic resin from the viewpoint of easy market availability.

The pressure-sensitive adhesive composition can be used mainly as a solvent solution by adding a solvent, but can also be used as a solvent-free hot melt material.

The waterproof film layer 10 is preferably a sheet that can be made into a roll from the viewpoint of handling. Moreover, the waterproof film layer 10 is a material which does not repel a solvent and an adhesive, and will not be specifically limited if it is a water-impermeable base material. If it is a thermoplastic resin, for example, an olefin polymer resin or a rubber material is preferable. Examples of the olefin polymer resin include polyethylene resin and polypropylene resin. Moreover, SIS (styrene thermoplastic elastomer) etc. can be mentioned typically as a rubber-type substance. Further, nylon resin, PET resin, vinyl chloride resin, polystyrene resin, polyurethane resin, and phenol resin can be used.

The thickness of the waterproof film layer 10, that is, the waterproof film is usually used in a range of 10 μm to 350 μm in many cases, but is not particularly limited and can be appropriately selected depending on the application. Furthermore, a non-water-permeable and moisture-permeable porous film (porous film) can also be used.

The top surface of the waterproof film layer 10 is embossed as a surface treatment layer 30 so that the operator does not slip when working on the waterproof structure for building foundation, and the waterproof structure for building foundation 1 is peeled off. A surface treatment such as a peeling treatment may be applied so that the roll can be wound without using paper.

For example, the embossing process first processes (transfer process) the upper surface of the waterproof film layer over the entire surface with a pattern having a depth of about 60 μm, and further, at least part of the upper surface of the waterproof film layer has an emboss depth of 2 μm to 50 μm. It can be performed by embossing fine irregularities in the range of.

Moreover, a peeling process can be performed by apply | coating a peeling agent (silicone type solution) to the uppermost surface of a waterproof film layer irrespective of the presence or absence of embossing.
Next, an example of the manufacturing method of the waterproof structure 1 for building foundations concerning this invention is demonstrated concretely.

The manufacturing process of the waterproof film which comprises the waterproof film layer 10 of this invention is shown in FIG. That is, a waterproof film material (for example, an olefin polymer resin) is extruded into a sheet shape using a T-die 124, and pressurized and cooled using a nip roll 122 and a chill roll 123. Thereby, the embossed shape provided in the chill roll can be transferred to the waterproof film. As shown in FIG. 7, the waterproof film 126 is formed on the surface of the process paper 121 and is taken up by the take-up roll 125 while proceeding in the direction of the arrow P.

The temperature of the waterproof film material extruded from the T-die 124 can be appropriately determined depending on the type of the waterproof film material. The thickness of the waterproof film extruded from the T-die 124 is preferably 10 to 350 μm when the obtained waterproof film is used for housing.

The extruder (not shown) used for extruding the waterproof film raw material is not particularly limited, and a known one can be used. For example, a screw type extruder can be used. The extrusion conditions can be appropriately determined depending on the waterproof film raw material to be used. A T-die 124 is attached to the tip of the extruder to form the waterproof film raw material into a sheet shape. The T-die 124 is not particularly limited, and is appropriately determined according to the shape of the waterproof sheet to be produced. be able to.

Pressure at which the waterproof film 126 is pressurized by the chill roll 123 and the nip roll 122 is preferably 10 N / mm ² or more, more preferably 15~20N / mm ^2. If the pressure is less than 10 N / mm ² , the embossed shape of the chill roll 123 may not be transferred.

Moreover, 10-60 degreeC is preferable and the temperature of the chill roll 123 has more preferable 20-40 degreeC. If it is lower than 10 ° C., it may condense and involve water, and if it is higher than 60 ° C., it may be difficult to sufficiently cure the waterproof film.

Next, the mold release process and the coating process of the water absorption swelling layer are shown in FIG. A release agent such as silicone is applied with a gravure coater 127 to the embossed surface of the waterproof film 126 manufactured by the above manufacturing method and on the surface opposite to the surface on which the water-absorbing swelling layer is formed. Evaporate. Further, the coating liquid 129 containing the adhesive 22, the water-absorbing particles 24 and the organic solvent is applied to the surface of the waterproof film 126 (the lower surface side of the waterproof film layer 10) with a knife coater 130, and then the waterproof film The coating liquid coated on the surface is dried with hot air in a drying furnace B131. Thereby, the water-absorbing swelling layer 20 of the solid state comprised including the adhesive 22 and the water absorbing particle 24 can be formed on the surface of a waterproof film, and the waterproof structure 100 for building foundations can be produced.

FIG. 9 shows a coating pattern of the coating liquid on the waterproof film 126, where (a) is a solid coating pattern, (b) is a lattice pattern, (c) is a dot pattern, (D) shows a stripe pattern. The black colored range is the coating location of the adhesive composition. About (b)-(d), the application location of an adhesive composition turns into a nail driving location.

In this case, acrylic adhesive can be mentioned as a kind of adhesive 22 contained in a coating liquid. Although it does not specifically limit as an organic solvent, Ethyl acetate, methyl ethyl ketone, toluene, IPA etc. can be mentioned.

The acrylic resin (concentration in terms of solid content) in the pressure-sensitive adhesive solution having an acrylic resin is preferably 10 to 70% by mass, and more preferably 20 to 60% by mass. The amount ratio of the water-absorbent particles in the pressure-sensitive adhesive is 5 parts by mass or more and 50 parts by mass or less per 100 parts by mass of the pressure-sensitive adhesive in terms of solid content (solid content 100%). The application amount of the pressure-sensitive adhesive composition in the water-absorbing swelling layer and the amount ratio of the water-absorbing particles in the water-absorbing swelling layer to the pressure-sensitive adhesive are finally determined in consideration of the required waterproof properties.

The method for applying the coating liquid to the surface of the waterproof film is not particularly limited, and any method such as a knife coating method, a die coating method, or a gravure printing method can be used. In particular, if a gravure printing method is used, a water-absorbing swelling layer can be formed in a desired application pattern on a desired portion of the waterproof film (see FIG. 9), and by adjusting the depth of the intaglio groove, It becomes possible to adjust the water absorption swelling layer thickness, that is, the coating amount of the pressure-sensitive adhesive composition.

Next, the construction method of the structure for building foundation according to the present invention to the building and the constructed building will be described.

The waterproof structure 1 for a building foundation according to the present invention can be supplied in a roll form as long as it is in a sheet form, and is constructed by the following procedure on a building, that is, a roof of a house.

(1) First, the water absorption swelling surface 20 side of the waterproof structure 1 for a building foundation unwound from the roll is put on the surface of the base material on the eaves side of the roof of the house, and is laid (temporarily fixed) almost horizontally. Usually, at the time of temporary fixing, the waterproof structure 1 for building foundation is bonded and fixed to the field material 50, and thus nails are not used. However, if the end portion is likely to be turned due to the shape of the base plate 50, it is fastened with a tape or a minimum number of nails (including staples) and treated so as not to be crushed by the wind.

(2) Next, the next waterproof structure for building foundation 1 is unwound from the roll, and is laid in the same manner while providing an overlapping portion on the building foundation waterproof structure 1 attached immediately before.

(3) Further, the construction foundation waterproof structure 1 of (1) and (2) is repeated, and the construction foundation waterproof structure 1 is spread over the entire roof surface.

(4) Next, roof roofing material such as tiles is fixed to the roof frame material such as field material with nail (including staples) sandwiching the waterproof structure for building foundation 1 on the entire roof surface.
As mentioned above, although the embodiment of the house which constructs the waterproof structure 1 for building foundations concerning this invention was described, the embodiment of this invention is not restricted to these.
Moreover, the house which constructed the waterproofing structure for building foundations according to the present invention has the following advantages over the conventional house.

(1) In the house according to the present invention, the number of nailing portions of the waterproof structure 1 for building foundations can be reduced. Therefore, it is possible to prevent water leakage due to the presence of the through hole of the waterproof structure for building foundations as much as possible.

(2) The house using the waterproof structure 1 for building foundations according to the present invention minimizes the spread of rainwater on the ground plate, etc., even when rainwater enters due to drilling with nails or the like. It can be suppressed. Therefore, for example, the mold generation area in the attic can be suppressed as much as possible.

(3) Since the waterproof structure for building foundation 1 and the plywood are in close contact with the adhesive composition layer, condensed water is unlikely to be generated on the surface of the field material or the like. Therefore, for example, the mold generation area in the attic can be suppressed as much as possible.
Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to these examples.

Waterproof evaluation test (Test 1) and adhesive strength measurement test (Test 2) for a waterproof structure for a building foundation composed of two layers, a waterproof film layer according to the present invention and a water absorption / swelling layer, and a waterproof film layer according to the present invention A waterproof evaluation test and an adhesive strength measurement test (Test 3) were conducted on the waterproof structure for building foundations composed of three layers, a water absorption swelling layer and an adhesive layer.

A. Test 1
(1) Polymer absorbent STM-500MPSA (having poly (sodium acrylate) having an average particle size of 35 μm) manufactured by Sanyo Chemical Co., Ltd. as a water-absorbing particle for sample preparation test and Soken Chemical Co., Ltd. as an adhesive Company-made pressure sensitive adhesive SK1717 (having an acrylic resin and 53% solvent) is prepared, and each pressure-sensitive adhesive composition is prepared at a composition ratio shown in Table 1. Next, the prepared pressure-sensitive adhesive composition was applied to a disk-like film having a diameter of 90 mm (olefin resin film having a thickness of 80 μm) and the coating amount in terms of solid content of the pressure-sensitive adhesive composition was 12.5 g / m ² . 25 g ^/ m ^2, to prepare a ^{37.5g / m 2, 50g / m} 2, 75g / m 2, 100g / m 2, the waterproof structure sample architectural foundation as.

Next, after placing these samples on a 5 cm × 5 cm plywood shown in FIG. 6, the samples were fixed to the plywood using staples. Thereby, six through holes are formed in the waterproof structure sample for building foundations, and staple needle tips are inserted into the through holes.

(2) Test Method A test was conducted in accordance with the rain test (shower test) A method defined in 7.3 of JISL 1092 (2009 edition).

Specifically, each building foundation waterproof structure sample was attached to the Pundesmann rain test apparatus, and the amount of rainfall was adjusted so that 200 ml of rainwater collected in the test cup in 1.5 minutes, and the test was conducted for 10 minutes.

(3) Test results The test results (waterproof evaluation results) are shown in Table 2. In the table, “x” means the case where the plywood gets wet with 50% or more of water, “Δ” means the case where the plywood gets 10-50% wet, and “◯” is less than 10%. It means the case where only the periphery of the staple stabbed into the plywood is submerged.

B. Test 2
(Test 2-1)

(1) Polymer absorbent STM-500MPSA (having poly (sodium acrylate) having an average particle size of 35 μm) manufactured by Sanyo Chemical Co., Ltd. as a water-absorbing particle for sample preparation test and Soken Chemical Co., Ltd. as an adhesive A pressure-sensitive adhesive SK1717 (having an acrylic resin and 53% solvent) is prepared, and each pressure-sensitive adhesive composition is prepared at a composition ratio shown in Table 1. Next, these prepared adhesive compositions were applied to a strip-like film having a width of 150 mm and a length of 300 mm (olefin resin film having a thickness of 80 μm), with coating amounts of 25 g / m ² and 50 g / m ² . A waterproof structure sample for building foundation was prepared.

(2) Test method A test was conducted in accordance with the adhesive strength measurement method specified in JISZ0237 (2009 edition).

(3) Test results Table 3 shows the test results.

(Test 2-2)

(1) Polymer absorbent STM-500MPSA (having poly (sodium acrylate) having an average particle size of 35 μm) manufactured by Sanyo Chemical Industries, Ltd. as a water-absorbing particle for sample preparation test, manufactured by Sanyo Chemical Industries Co., Ltd. Polymer absorbent YH2 (having poly (sodium acrylate) having an average particle size of 70 μm) and pressure-sensitive adhesive SK1717 (having acrylic resin) manufactured by Soken Chemical Co., Ltd. were prepared, and the compositions shown in Table 4 were prepared. Each adhesive composition is produced by ratio.

Then (to use a thick 80μm with an olefin resin film.) Strip-shaped film of the prepared adhesive compositions width 150 mm, length 300mm, the building as a coating weight ^25g / ^{m 2 ~100g} / m 2 A base waterproof structure sample was prepared.

(2) Test method A test was conducted in accordance with the adhesive strength measurement method specified in JISZ0237 (2009 edition).

(3) Test results Table 5 shows the test results. In the bottom column of Table 5, the results of waterproof evaluation performed by the same method and evaluation criteria as in Test 1 are shown.

C. Test 3

(1) Polymer absorbent STM-500MPSA (having poly (sodium acrylate) having an average particle size of 35 μm) manufactured by Sanyo Chemical Co., Ltd. as a water-absorbing particle for sample preparation test and Soken Chemical Co., Ltd. as an adhesive Company-made pressure sensitive adhesive SK1717 (having acrylic resin and 53% solvent) is prepared, and each pressure-sensitive adhesive composition is prepared at a composition ratio shown in Table 6. Next, in the same manner as in Test 1 for the waterproof evaluation test, these prepared adhesive compositions were applied to a disc-shaped film having a diameter of 90 mm (an olefin resin film having a thickness of 80 μm) and the coating amount of Sample 3 -1 for 25 g / m ² , sample 3-2 for 50 g / m ² , sample 3-3 for 25 g / m ² and further adhesive SK1717 (with acrylic resin and 53% solvent) .) Only 25 g / m ² to prepare a waterproof structure sample for a building foundation. Next, after arranging these samples on a 5 cm × 5 cm plywood shown in FIG. 6, the samples were fixed to the plywood using a tucker. Thereby, six through-holes are formed in the waterproof structure sample for building foundations, and the needle points of the tucker are inserted into the through-holes.

Next, in the same manner as in Test 2 for the adhesive strength measurement test, these prepared adhesive compositions were applied to a strip-like film having a width of 150 mm and a length of 300 mm (olefin resin film having a thickness of 80 μm). For sample 3-1 is 25 g / m ² , sample 3-2 is 50 g / m ² , sample 3-3 is 25 g / m ² and only adhesive is 25 g / m ² A structure sample was prepared.

(2) Test method A test was conducted in accordance with the adhesive strength measurement method specified in JISZ0237 (2009 edition).

(3) Test results Table 7 shows the test results. In addition, the waterproof evaluation result performed by the method and evaluation criteria similar to the test 1 was shown in the bottom column of Table 7.

1,100 Waterproof structure for building foundation (underlaying material)
DESCRIPTION OF SYMBOLS 10 Waterproof film layer 20 Water absorption swelling layer 22 Adhesive 24 Water-absorbing particle 26 Adhesion layer 30 Surface treatment layer (embossing layer, peeling treatment layer)
50 field material 52 rafter 54 pier 56 56 tile (upper fence material)
58 Nails (including staples)
80 Plywood 121 Process paper 122 Nip roll 123 Chill roll 124 T-die 125 Winding roll 126 Waterproof film 127 Gravure coater 128 Drying furnace A
129 Coating liquid 130 Knife coater 131 Drying furnace B
200 House roof

Claims (1)

A method for constructing a waterproof structure for a building foundation on a building, wherein the waterproof structure for a building foundation has a waterproof film layer and a water-absorbing swelling layer, and the water-absorbing swelling layer contains water-absorbing particles and an adhesive. The water-absorbing particles are present in a state of being dispersed in the pressure-sensitive adhesive, and the water-absorbing swelling layer is a roofing roof material provided on the lower surface side of the waterproof film layer.