Waterproof sheet, resin composition and sealant

Abstract

To provide a waterproof sheet that is used and included in a sheet waterproofing structure to render a building frame waterproof, ensuring that leakage of plasticizer from the waterproof sheet is reduced or prevented; a resin composition used in molding the waterproof sheet; and a sealant used in sealing the waterproof sheet.SOLUTION: One embodiment of the present invention is a waterproof sheet 30 included in a sheet waterproofing structure 10 to render a building frame 100 waterproof. The waterproof sheet contains vinyl chloride resin and plasticizer. After stored in a storage tank 20 (Figure 2) at 80°C for 84 days, the percentage A of the plasticizer remaining in the waterproof sheet is 93.0% or more.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a waterproof sheet used in a sheet waterproof structure that waterproofs a building frame, a resin composition used to mold such a waterproof sheet, and a sealant containing such a resin composition. [Background technology]

[0002] In recent years, with the demand for higher durability in buildings, sheet waterproofing structures in which waterproof sheets (resin sheets) are laid and constructed have been adopted on the rooftops, verandas, etc. of many buildings (see, for example, Patent Document 1).

[0003] This sheet waterproofing structure, for example, comprises a waterproof sheet and multiple fixed disks, and the waterproof sheet laid on at least a part of the structure is joined (fixed) to the structure via the fixed disks, thereby ensuring waterproofing of the structure against rainwater, etc.

[0004] In a sheet waterproofing structure of this type, the waterproof sheet contains, for example, polyvinyl chloride resin and plasticizer, and when exposed to rainwater and sunlight, the plasticizer leaks out of the waterproof sheet over time, resulting in a decrease in the flexibility of the waterproof sheet, which can cause cracks or breaks in the waterproof sheet, allowing water to penetrate into the structure itself, i.e., a decrease in the waterproofing properties of the sheet waterproofing structure.

[0005] Therefore, there is a need for the development of a waterproof sheet that accurately suppresses or prevents leakage of plasticizer from the waterproof sheet over time, in order to prevent the waterproof sheet from losing its flexibility and further from cracking, breaking, etc. However, at present, it cannot be said that leakage of plasticizer from the waterproof sheet is sufficiently suppressed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-53517 Summary of the Invention [Problem to be solved by the invention]

[0007] The object of the present invention is to provide a waterproof sheet in a sheet waterproofing structure that waterproofs a body, in which leakage of plasticizer from the waterproof sheet provided in the sheet waterproofing structure is appropriately suppressed or prevented, a resin composition used to mold such a waterproof sheet, and a sealing material used to seal such a waterproof sheet. [Means for solving the problem]

[0008] Such objectives are as follows: (1) 7 This is achieved by the present invention described in (1) A waterproof sheet containing vinyl chloride resin and a plasticizer, which is provided in a sheet waterproofing structure that waterproofs a structure, the plasticizer is a monomer polymer containing, as a monomer component, a (meth)acrylic acid alkyl ester, a (meth)acrylic acid cycloalkyl ester, or a (meth)acrylic acid aryl ester; The plasticizer is contained in the waterproof sheet in an amount of 20.0 parts by weight or more and 90.0 parts by weight or less per 100.0 parts by weight of the vinyl chloride resin, A waterproof sheet characterized in that the residual rate A of the plasticizer measured by the following evaluation method A is 93.0% or more. (Evaluation Method A) First, a first test piece made of the waterproof sheet having dimensions of 2.0 mm thick x 90 mm long x 90 mm wide is prepared, and then the weight [g] of the first test piece is measured as the initial weight. Next, a storage tank is prepared that has a storage space with an upper opening and that can accommodate the first test piece at the bottom of the storage space with the surface of the first test piece exposed in a circular shape with a diameter of 60 mm, and the first test piece is installed in the storage tank. Next, 15 g of mud (JIS Z 8901 test powder 1 (type 11)) and 25 mL of pure water were added to the storage space of the storage tank with the first test piece attached, and the storage tank was then stored in an oven at 80° C. for 84 days, with 25 mL of pure water being added every 12 hours. Next, the first test piece is removed from the storage tank, washed, and dried, and its weight [g] is measured as the weight after repeated wetting and drying. The weight [%] after repeated wetting and drying, calculated when the initial weight is set to 100.0%, is determined as the residual ratio A [%] of the plasticizer.

[0009] (2) The waterproof sheet according to (1) above, in which the residual rate B of the plasticizer measured by the following evaluation method B is 80.0% or more. (Evaluation Method B) First, a second test piece made of the waterproof sheet having dimensions of 2.0 mm thick x 30 mm wide x 100 mm long is prepared, and then the elongation percentage [%] of the second test piece is measured as the initial elongation percentage based on a tensile test in accordance with JIS A 6008. Next, a butyl rubber tape made of butyl rubber and measuring 2.0 mm thick x 35 mm wide x 110 mm long is attached to one side of the second test piece, and then this is stored in an oven at 80°C for 28 days. Next, after peeling the butyl rubber tape from the second test piece, the elongation percentage [%] of the second test piece is measured as the elongation percentage after storage based on a tensile test in accordance with JIS A 6008. Then, the elongation percentage [%] after storage, calculated when the initial elongation percentage is set to 100.0%, is determined as the residual percentage B [%] of the plasticizer.

[0013] ( 3 ) The waterproof sheet further comprises the above (1) containing a stabilizer. or (2) The waterproof sheet described in

[0014] ( 4 ) The sheet waterproof structure is The aforementioned A first waterproof sheet is provided to cover at least a part of a floor portion of the building body and a wall portion erected from the floor portion, The waterproof sheet is the same as the first waterproof sheet (1) to ( 3 ) A waterproof sheet described in any of the following.

[0015] ( 5 ) The sheet waterproof structure is The aforementioned The structure comprises a first waterproof sheet that covers at least a portion of a floor portion of the building body and a wall portion erected from the floor portion, and a second waterproof sheet that covers a portion of the first waterproof sheet, The waterproof sheet is the same as the above (1) to ( 4 ) A waterproof sheet described in any of the following.

[0016] ( 6 ) (1) above or ( 5 ) A resin composition used for molding a waterproof sheet according to any one of A resin composition comprising the vinyl chloride resin and the plasticizer.

[0017] ( 7 ) (1) above or ( 5 A sealant used to form a coating layer that selectively covers the vicinity of the end of the waterproof sheet according to any one of A sealant comprising the vinyl chloride resin, the plasticizer, and a solvent. [Effects of the Invention]

[0018] According to the present invention, the residual plasticizer rate A in the waterproof sheet measured by the evaluation method A is 93.0% or more, which means that the waterproof sheet can be reliably inhibited or prevented from leaking out of the plasticizer over time due to exposure to rainwater or sunlight. This effectively inhibits or prevents the loss of flexibility of the waterproof sheet, and ultimately the occurrence of cracks, breaks, and the like, caused by the leakage (bleed-out) of the plasticizer. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a partial perspective view showing a first embodiment of a sheet waterproofing structure applied to a body. [Figure 2]This is a vertical cross-sectional view of a storage tank used to determine the residual rate [%] of plasticizer in a waterproof sheet using the leakage evaluation method. [Figure 3] FIG. 10 is a partial perspective view showing a second embodiment of a sheet waterproofing structure applied to a body. DETAILED DESCRIPTION OF THE INVENTION

[0020] The waterproof sheet, resin composition and sealant of the present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings.

[0021] First, before describing the waterproof sheet, resin composition, and sealant of the present invention, a sheet-type waterproofing structure applied to a building frame to which the waterproof sheet of the present invention can be applied will be described.

[0022] <Waterproof sheet structure> <<First Embodiment>> Figure 1 is a partial perspective view of a first embodiment of a sheet waterproofing structure applied to a structure, and Figure 2 is a longitudinal cross-sectional view of a storage tank used to determine the residual plasticizer rate [%] in a waterproofing sheet using a leakage evaluation method. In the following explanation, the upper side in Figures 1 and 2 will be referred to as "top" and the lower side will be referred to as "bottom." For ease of explanation, Figure 1 does not show the entire structure to which the sheet waterproofing structure is applied, but only partially illustrates the floor and wall portions of the structure. Furthermore, Figures 1 and 2 illustrate the sheet waterproofing structure and storage tank, respectively, for easy visibility, and therefore differ significantly from their actual dimensions.

[0023] The sheet waterproofing structure 10 is constructed on a body 100 having a floor portion 101 and a wall portion 102 (rising portion) that is erected along and surrounds the outer edge of the floor portion 101, and includes a waterproof sheet 30 laid on the floor portion 101 and the wall portion 102, a positioning member 50, and a fixed disk (not shown).

[0024] The placement members 50 each have a bottom 51 and a raised surface 52 with an overall rectangular shape, and are placed at the boundary between the floor 101 and the wall 102. Furthermore, multiple fixed disks are fixed to the floor 101 with fixing screws at a predetermined (constant) interval. In this state, the waterproof sheet 30, which is primarily made of polyvinyl chloride resin, is fixed to the placement members 50 and the fixed disks, covering the floor 101 and the wall 102 together with the placement members 50, the fixed disks, and the fixing screws, thereby ensuring the waterproofness of the main body 100.

[0025] That is, the waterproof sheet 30 is exposed to sunlight and rainwater, and the main body 100 is prevented from being directly exposed to sunlight and rainwater, thereby ensuring the waterproofness of the main body 100. In addition, the upper surface of the fixing disk is joined to the lower surface of the waterproof sheet 30, thereby joining the floor part 101 and the waterproof sheet 30 via the fixing disk, and as a result, the waterproof sheet 30 is fixed to the main body 100 without being torn off by wind, etc.

[0026] The positioning member 50 and the fixed disk are both made of a metal plate and a resin layer that covers the surface of the metal plate.

[0027] This metal plate is made of, for example, a steel plate such as a stainless steel plate or an iron plate, an aluminum plate, a copper plate, or the like, but is preferably a steel plate.

[0028] The thickness of the metal plate is not particularly limited, but is preferably about 0.1 mm or more and 3 mm or less, and more preferably about 0.3 mm or more and 2.5 mm or less.

[0029] Examples of resins constituting the resin layer include vinyl chloride resins such as polyvinyl chloride, polyolefin resins, and ethylene-vinyl acetate copolymers. One or more of these can be used in combination, but vinyl chloride resins (particularly polyvinyl chloride) are preferred. That is, it is preferable that the resin be the same or identical to the resin constituting the waterproof sheet 30 described below. This improves the adhesion between the resin layer and the waterproof sheet 30. Furthermore, polyvinyl chloride has excellent solvent welding and heat fusion properties, so it can more significantly exhibit the above-mentioned effects and more reliably prevent corrosion of the metal plate.

[0030] The resin constituting this resin layer may also contain other materials such as plasticizers and stabilizers, which are listed as constituent materials of the waterproof sheet 30, which will be described later.

[0031] Furthermore, the thickness of the resin layer is not particularly limited, but is preferably 0.1 mm or more, and more preferably 0.3 mm to 0.8 mm, which effectively prevents cracks and breaks in the resin layer even if stress acts on the resin layer due to the waterproof sheet 30 being blown by the wind.

[0032] The waterproof sheet 30 (first waterproof sheet) is in the form of a sheet (plate) and covers the floor portion 101 and the wall portion 102 together with the arrangement member 50 and the fixed disk.

[0033] This allows the waterproof sheet 30 to be exposed to sunlight and rainwater, while preventing the main body 100 from being directly exposed to sunlight and rainwater, thereby ensuring the waterproofing of the main body 100.

[0034] Such a waterproof sheet 30 is composed of a resin sheet containing vinyl chloride resin and a plasticizer, and in this embodiment, the waterproof sheet of the present invention can be applied to this waterproof sheet 30, but details of this will be described later.

[0035] In addition, the sheet waterproof structure 10 may have a cross sheet that is laid on the floor portion 101 and interposed between the floor portion 101 and the waterproof sheet 30.

[0036] This cross sheet is, for example, an insulating cross sheet made of polyethylene woven fabric. Alternatively, a walking board made of a high-rigidity board such as a glass fiber fireproof sheet, an aluminum foil laminate sheet for pinhole inspection, a calcium silicate board, an asbestos slate board, or a lightweight aerated concrete board may be laid on the floor 101. Furthermore, a laminate having one of these as the upper layer and a heat insulating layer (heat insulating material) made of expanded polystyrene, polyurethane foam, polyisocyanurate foam, phenol foam, or the like as the lower layer may be laid on the floor 101. By interposing these sheets between the floor 101 and the waterproof sheet 30, the cushioning, insulation, and heat insulating properties of the sheet-type waterproof structure 10 can be ensured.

[0037] <Waterproof sheet> As described above, the waterproof sheet of the present invention can be applied to the waterproof sheet 30 provided in the sheet waterproof structure 10 having such a configuration.

[0038] The waterproof sheet of the present invention contains a vinyl chloride resin and a plasticizer, and satisfies a plasticizer residual rate A of 93.0% or more according to a leakage evaluation method (evaluation method A) that evaluates the leakage of plasticizer due to repeated drying and wetting in a muddy volume state.

[0039] (Leakage evaluation method) First, a test piece 35 (first test piece) made of a waterproof sheet measuring 2.0 mm thick x 90 mm long x 90 mm wide is prepared, and then the weight [g] of this test piece 35 is measured as the initial weight.

[0040] Next, a storage tank 20 is prepared which has a storage space 26 with an upper opening and in which a test piece 35 can be attached with the surface of the test piece 35 exposed in a circular shape with a diameter of 60 mm at the bottom of the storage space 26, and the test piece 35 is attached to this storage tank 20.

[0041] Next, 15 g of mud 82 (JIS Z 8901 test powder 1 (type 11)) and 25 mL of pure water 81 are added to the storage space 26 of the storage tank 20 with the test piece 35 attached, and the storage tank 20 is then stored in an oven at 80°C for 84 days. During this time, 25 mL of pure water 81 is added every 12 hours.

[0042] Next, the test piece 35 is removed from the storage tank 20, and the weight [g] of the test piece 35 after washing and drying is measured as the weight after repeated wetting and drying. The weight [%] after repeated wetting and drying, calculated when the initial weight is 100.0%, is then determined as the residual rate A [%] of the plasticizer.

[0043] In the present invention, the plasticizer residual rate A determined by this leakage evaluation method (evaluation method A) is 93.0% or higher. This means that the waterproof sheet can be effectively inhibited or prevented from leaking over time due to exposure to rainwater or sunlight. This effectively inhibits or prevents the loss of flexibility of the waterproof sheet, and ultimately the occurrence of cracks, breaks, and the like in the waterproof sheet, which are caused by the leakage (bleed-out) of the plasticizer. Therefore, the sheet-type waterproof structure 10 equipped with the waterproof sheet of the present invention as the waterproof sheet 30 exhibits excellent waterproofing.

[0044] The following describes the constituent materials of the waterproof sheet of the present invention, that is, the waterproof sheet that satisfies the requirement that the residual rate A of plasticizer measured by the leakage evaluation method (evaluation method A) be 93.0% or more.

[0045] (a) Vinyl chloride resin The vinyl chloride resin is contained in the waterproof sheet as the main material of the waterproof sheet in order to make the waterproof sheet into a sheet (layer).

[0046] The vinyl chloride resin is not particularly limited as long as it is a polymer containing vinyl chloride, that is, an oligomer, a prepolymer, or a polymer.

[0047] Specifically, such vinyl chloride resins include, for example, monomeric polymers (homopolymers) of vinyl chloride, or copolymers of vinyl chloride with vinyl acetate, ethylene, propylene, or the like, and also include those in which other polymers are grafted as side chains to the main chains of these monomeric polymers or copolymers, and one or more of these can be used in combination. Note that when the main chain of a monomeric polymer or copolymer is composed of a monomeric polymer, the main chain is linear, but when it is composed of a copolymer, if the copolymer is a random copolymer, alternating copolymer, or block copolymer, the main chain is linear, and if the copolymer is a graft copolymer, the main chain is branched.

[0048] By using these as the vinyl chloride resin, the waterproof sheet can be formed into a sheet shape and can function as a waterproof sheet.

[0049] Furthermore, from the viewpoint of suppressing the leakage (bleed-out) of the plasticizer from the waterproof sheet and satisfying the requirement of a plasticizer residual rate A of 93.0% or more as determined by the leakage evaluation method (evaluation method A), it is preferable that the vinyl chloride resin has a linear overall structure. By combining such a vinyl chloride resin with a plasticizer, it is possible to accurately suppress or prevent the plasticizer from leaking from the waterproof sheet, and it is therefore relatively easy to satisfy the requirement of a plasticizer residual rate A of 93.0% or more.

[0050] (b) Plasticizer The plasticizer is contained to impart excellent flexibility to the waterproof sheet. The plasticizer is not particularly limited, but in the present invention, a plasticizer is preferably used that can accurately suppress or prevent leakage and relatively easily satisfy the requirement that the plasticizer residual rate A be 93.0% or more. Examples of such plasticizers include (meth)acrylic acid ester polymers, vinyl acetate copolymers, and polyester plasticizers. One or a combination of two or more of these can be used, but among these, a (meth)acrylic acid ester polymer is particularly preferred.

[0051] In this way, using a (meth)acrylic acid ester polymer as the plasticizer effectively suppresses or prevents leakage of the plasticizer, i.e., the (meth)acrylic acid ester polymer, from the waterproof sheet, making it relatively easy to achieve a plasticizer residual rate A of 93.0% or more. Therefore, it can be said that leakage of the plasticizer from the waterproof sheet over time due to exposure to rainwater or sunlight is effectively suppressed or prevented. Therefore, a decrease in the flexibility of the waterproof sheet, and ultimately the occurrence of cracks, breaks, etc., due to the leakage (bleed-out) of the plasticizer, can be effectively suppressed or prevented, and the sheet-type waterproof structure 10 including the waterproof sheet of the present invention as the waterproof sheet 30 exhibits excellent waterproofing. Furthermore, by including a (meth)acrylic acid ester polymer as the plasticizer, adhesion of dirt to the waterproof sheet due to exposure to rain and wind can be effectively suppressed or prevented.

[0052] A (meth)acrylic acid ester-based polymer is a polymer containing a (meth)acrylic acid ester as a main monomer component, and has a main chain formed of a monomeric polymer (homopolymer) or copolymer thereof. The polymer may be composed solely of this main chain, or may have a configuration in which another polymer (having no functional group), a functional group, or a polymer having a functional group is grafted onto the main chain as a side chain, i.e., a substituent.

[0053] In this specification, the term "(meth)acrylic acid ester" is used to include both acrylic acid ester and methacrylic acid ester.

[0054] The (meth)acrylic acid ester is not particularly limited, and examples thereof include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, and (meth)acrylic acid esters. Examples of suitable acrylates include alkyl (meth)acrylates such as decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, and octadecyl (meth)acrylate; cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate; and aryl (meth)acrylates such as phenyl (meth)acrylate. These may be used alone or in combination. Among these, alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and octyl (meth)acrylate are preferred. Alkyl (meth)acrylates are particularly heat-resistant and readily available at low cost. Furthermore, by using a (meth)acrylic acid alkyl ester as the (meth)acrylic acid ester in the (meth)acrylic acid ester-based polymer, leakage of the (meth)acrylic acid ester-based polymer as a plasticizer from the waterproof sheet can be more accurately suppressed or prevented.

[0055] Furthermore, when the (meth)acrylic acid ester-based polymer is constructed with a copolymer having a (meth)acrylic acid ester as the main monomer component as the main chain, examples of this copolymer include copolymers of a (meth)acrylic acid ester with (meth)acrylic acid, acrylonitrile, vinyl acetate, ethylene, propylene, or the like.

[0056] The (meth)acrylic acid ester-based polymer that can be configured as described above is preferably a non-functional acrylic acid ester monomer polymer in which the monomer polymer containing a (meth)acrylic acid alkyl ester as a monomer component is not substituted with the above-mentioned substituent. This more effectively suppresses or prevents leakage of the (meth)acrylic acid ester-based polymer (non-functional acrylic acid ester monomer polymer) acting as a plasticizer from the waterproof sheet. Therefore, the requirement of a residual rate A of the plasticizer of 93.0% or more can be easily satisfied.

[0057] The weight average molecular weight of the non-functional acrylic acid ester monomer polymer is preferably 1,000 or more and 5,000 or less, and more preferably 2,000 or more and 3,500 or less.

[0058] Furthermore, the glass transition temperature Tg of the non-functional acrylic acid ester monomer polymer is preferably -100°C or higher and -30°C or lower, and more preferably -95°C or higher and -75°C or lower.

[0059] By setting the weight-average molecular weight and glass transition temperature Tg of the non-functional acrylic acid ester monomer polymer within the above-mentioned ranges, the effects obtained by using the non-functional acrylic acid ester monomer polymer as the (meth)acrylic acid ester-based polymer (plasticizer) can be more significantly exhibited.

[0060] For these reasons, a preferred combination of vinyl chloride resin and plasticizer is a combination of a vinyl chloride resin with a linear overall structure and a (meth)acrylic acid ester polymer (particularly a non-functional acrylic acid ester monomer polymer), which can more effectively suppress or prevent leakage of the (meth)acrylic acid ester polymer (non-functional acrylic acid ester monomer polymer) from the waterproof sheet. This makes it easier to satisfy the requirement that the residual rate A of the plasticizer be 93.0% or more.

[0061] Examples of polyester plasticizers include poly(ethylene glycol / adipic acid) ester, poly(1,3-butanediol / adipic acid) ester, and poly(propylene glycol / sebacic acid) ester.

[0062] Examples of vinyl acetate copolymers include ethylene-vinyl acetate copolymer, propylene-vinyl acetate copolymer, and butylene-vinyl acetate copolymer.

[0063] In addition to the plasticizers mentioned above, other plasticizers may be included as long as the plasticizer residual rate A is within a range that satisfies the requirement of 93.0% or higher. Examples of other plasticizers include low-molecular-weight plasticizers. Specific examples include, but are not limited to, phthalate ester plasticizers such as DINP (diisononyl phthalate), DOP (dioctyl phthalate), DBP (dibutyl phthalate), DIBP (diisobutyl phthalate), and DHP (diheptyl phthalate), aliphatic dibasic acid ester plasticizers such as DOA (di-2-ethylhexyl adipate), DIDA (diisodecyl adipate), and DOS (di-2-ethylhexyl sebacate), aromatic carboxylic acid ester plasticizers such as ethylene glycol benzoates, and trimellitic acid ester plasticizers such as TOTM (trioctyl trimellitate), and these may be used alone or in combination. By including a low molecular weight plasticizer as the plasticizer, it is possible to effectively suppress or prevent the adhesion of dirt to the surface of the waterproof sheet.

[0064] The plasticizer content in the waterproof sheet is not particularly limited, but is preferably 20.0 to 90.0 parts by weight, and more preferably 50.0 to 75.0 parts by weight, per 100.0 parts by weight of vinyl chloride resin. This ensures that the waterproof sheet has excellent flexibility and can function as a waterproof sheet to prevent water from penetrating into the structure 100. The vinyl chloride resin, which is the main material, also retains the plasticizer, making it relatively easy to achieve a plasticizer residual rate A of 93.0% or more.

[0065] (c) Other constituent materials In addition to the vinyl chloride resin and plasticizer, the waterproof sheet 30 may also contain other constituent materials such as stabilizers, stabilization aids, antioxidants, ultraviolet absorbers, processing aids, lubricants, fillers, flame retardants, shielding materials, and colorants.

[0066] Examples of stabilizers include organotin stabilizers, organosilicon stabilizers, ester stabilizers such as butyl stearate, calcium-zinc stabilizers, barium-zinc stabilizers, and barium-cadmium stabilizers. Examples of stabilizing aids in this case include epoxidized soybean oil, epoxidized linseed oil, epoxidized polybutadiene, and organic phosphate esters such as tricresyl phosphate (TCP), trixylyl phosphate (TXP), tributyl phosphate (TBP), tri-2-ethylhexyl phosphate, and 2-ethylhexyl diphenyl phosphate.

[0067] By appropriately selecting the type and content of each of the constituent materials (a) to (c), including essential constituent materials (a) and (b), contained in the waterproof sheet having the above-described configuration, it is sufficient to satisfy the plasticizer residual rate A of 93.0% or more, as measured by the leakage evaluation method (evaluation method A) for evaluating the plasticizer leakage caused by repeated drying and wetting in a muddy state, but it is preferable that it be 96.0% or more. By setting the plasticizer residual rate [%] in the waterproof sheet at or above the lower limit, it can be said that leakage of the plasticizer from the waterproof sheet is more accurately suppressed. Therefore, a sheet-type waterproof structure 10 equipped with the waterproof sheet of the present invention as the waterproof sheet 30 exhibits superior waterproofing.

[0068] Here, in the leakage evaluation method (evaluation method A), the storage tank 20 into which the test piece 35 (first test piece) made of a waterproof sheet is attached has a storage space 26 with an upper opening, and can have any configuration as long as the surface of the test piece 35 can be exposed in a circular shape with a diameter of 60 mm at the bottom of this storage space 26, but a configuration such as the one below is preferably used.

[0069] The reservoir 20 will be described below. As shown in Figure 2, this storage tank 20 has a flat bottom plate 21, a cover member 22 with an upper opening and a lower opening, a ring-shaped gasket 23, a clip 24, and a fixing screw 25.

[0070] The bottom plate 21 is made of a stainless steel substrate and is 90 mm long x 90 mm wide. The cover member 22 is made of transparent glass and is a shell with an overall hemispherical shape, with upper and lower openings, a protrusion protruding above the upper opening, and a rim protruding to the side of the lower opening. The lower opening is circular and has a diameter of 60 mm.

[0071] A test piece 35 made of a waterproof sheet measuring 2.0 mm thick x 90 mm long x 90 mm wide is placed on the bottom plate 21. Then, a gasket 23 and a cover member 22 are placed on the test piece 35 in this order. The edges of the bottom plate 21 and the cover member 22 are clamped with clips 24, which are then fastened with fixing screws 25. The edges of the bottom plate 21 and the cover member 22 are thereby fixed by the clips 24 and the fixing screws 25. As a result, a storage space 26 is defined in the storage tank 20 by the cover member 22, the gasket 23, and the test piece 35. The surface of the test piece 35 is circular and 60 mm in diameter at the bottom of the storage space 26, and is exposed to face the interior of the storage space 26.

[0072] That is, in the storage tank 20 having the storage space 26 with an upper opening, the surface (upper surface) of the test piece 35 forms a circle with a diameter of 60 mm at the bottom surface (bottom) of the storage space 26, and a part of it is exposed.

[0073] (Leakage evaluation method) Then, in the leakage evaluation method (evaluation method A) that uses this storage tank 20 to evaluate the leakage of plasticizer due to repeated drying and wetting in a mud volume state, the residual rate [%] of plasticizer in the waterproof sheet is calculated as follows.

[0074] That is, in the leakage evaluation method, before using the storage tank 20, the weight [g] of a test piece 35 made to have dimensions of 2.0 mm thick x 90 mm long x 90 mm wide is measured as the initial weight.

[0075] Next, the test piece 35 is attached to the storage tank 20, and then 15 g of mud 82 (JIS Z 8901 test powder 1 (type 11)) and 25 mL of pure water 81 are added to the storage space 26 of the storage tank 20, and the storage tank 20 in this state is stored in an oven at 80°C for 84 days. At this time, 25 mL of pure water 81 is added every 12 hours in the morning and evening (twice a day), so that the test piece 35 is exposed to alternating wet and dry conditions.

[0076] Next, the test piece 35 is removed from the storage tank 20, and the weight [g] of the test piece 35 after washing and drying is measured as the weight after repeated wetting and drying. The weight [%] after repeated wetting and drying, calculated when the initial weight is 100.0%, can be determined as the residual rate A [%] of plasticizer in the waterproof sheet.

[0077] In addition to the leakage evaluation method described above, it is preferable that the residual rate of plasticizer in the waterproof sheet be set to a value equal to or above the lower limit shown below in the migration evaluation method (evaluation method B) that evaluates the migration of plasticizer into butyl rubber tape, and the volatility evaluation method (weather resistance evaluation method, evaluation method C) that evaluates the volatility of plasticizer when irradiated with a metal halide lamp.

[0078] (Transferability assessment method) Specifically, in the migration evaluation method (evaluation method B) for evaluating the migration of plasticizers into butyl rubber tape, the residual plasticizer percentage B [%] in the waterproof sheet is determined by first preparing a test piece B made of a waterproof sheet measuring 2.0 mm thick, 30 mm wide, and 100 mm long, and measuring the initial elongation [%] of this test piece B based on a tensile test in accordance with JIS A 6008. Next, a butyl rubber tape made of butyl rubber measuring 2.0 mm thick, 35 mm wide, and 110 mm long is attached to one side of this test piece B, and the test piece is then stored in an oven at 80°C for 28 days, after which the butyl rubber tape is peeled off from test piece B. The elongation [%] of test piece B from which the butyl rubber tape has been peeled off is then measured based on a tensile test in accordance with JIS A 6008 as the elongation [%] after storage. The elongation rate [%] after storage, calculated when the initial elongation rate is set to 100.0%, is then determined as the residual rate B [%] of plasticizer in the waterproof sheet.

[0079] The plasticizer residual rate B [%] in the waterproof sheet determined as described above using the migration evaluation method is preferably 80.0% or more, and more preferably 90.0% or more. By setting the plasticizer residual rate [%] in the waterproof sheet to the lower limit or higher, it can be said that leakage of the plasticizer from the waterproof sheet is appropriately suppressed.

[0080] (Volatility evaluation method) In addition, in the volatility evaluation method (weather resistance evaluation method, evaluation method C) for evaluating the volatility of plasticizers due to irradiation with a metal halide lamp, the residual rate C [%] of plasticizer in a waterproof sheet is measured by first preparing a test piece C made of a waterproof sheet measuring 2.0 mm thick x 50 mm wide x 100 mm long, and measuring the elongation [%] of this test piece C as the initial elongation [%] based on a tensile test in accordance with JIS A 6008. Next, after placing test piece C on a black panel, a metal halide lamp is irradiated on this test piece C at an irradiation intensity of 81 mW / cm. 2The conditions for irradiation are: spray cycle: 2 minutes out of 120 minutes, black panel temperature: 80°C, irradiation time: 1800 hours. Then, based on a tensile test in accordance with JIS A 6008, the elongation [%] of test piece C after irradiation with the metal halide lamp is measured as the elongation [%] after irradiation. The elongation [%] after irradiation, calculated when the initial elongation is 100.0%, is then calculated as the residual plasticizer rate C [%] in the waterproof sheet.

[0081] The residual plasticizer rate C [%] in the waterproof sheet determined as described above by the volatility evaluation method is preferably 80.0% or more, and more preferably 90.0% or more. By setting the residual plasticizer rate [%] in the waterproof sheet to the lower limit or higher, it can be said that leakage of the plasticizer from the waterproof sheet is appropriately suppressed.

[0082] The above-mentioned waterproof sheet may be composed of a single layer of a resin sheet made of the above-mentioned constituent materials, or may be composed of, for example, one having a fiber layer inserted in the middle of the thickness direction, that is, one composed of a laminate in which a fiber layer (fiber sheet) is sandwiched between a first resin layer and a second resin layer stacked in the thickness direction. Whether such a waterproof sheet is composed of a single layer or a laminate, the layer of the resin sheet made of the above-mentioned constituent materials will be located as the outermost layer.

[0083] This fiber layer is composed of an aggregate of fibers, and examples include fiber sheets such as cloth such as woven or nonwoven fabric, and nets with multiple lattices formed by warp and weft threads.By providing a waterproof sheet with such a fiber layer, the strength (tear strength, tensile strength, etc.) and durability (resistance to repeated fatigue) of the waterproof sheet can be improved.

[0084] Furthermore, the thickness of the waterproof sheet is not particularly limited, but is preferably, for example, about 0.5 mm or more and 3.0 mm or less, and more preferably about 0.8 mm or more and 3.0 mm or less. This allows the waterproof sheet 30 to reliably cover the floor 101 and the wall 102 when applied to the waterproof sheet 30. Furthermore, even if plasticizer accidentally leaks from the waterproof sheet 30 and its flexibility decreases, early cracks and breaks in the waterproof sheet 30 can be effectively prevented.

[0085] Furthermore, the waterproof sheet can be molded, for example, as follows. That is, first, a vinyl chloride resin, a plasticizer, and, if necessary, other constituent materials are uniformly mixed using a mixer to obtain a resin composition (the resin composition of the present invention) composed of powder. This resin composition is then heated and kneaded, and then formed into a sheet using a roll to form a heated waterproof sheet. This can then be further molded by heat pressing and cooling. Alternatively, the resin composition composed of powder can be molded into pellets, and the pelletized resin composition can be used to form a sheet-shaped waterproof sheet.

[0086] <<Second embodiment>> Furthermore, the sheet waterproof structure 10 may have the configuration described in the first embodiment, or may have the following configuration.

[0087] Figure 3 is a partial perspective view of a second embodiment of a sheet waterproofing structure applied to a structure. In the following description, the upper side in Figure 3 will be referred to as "top" and the lower side as "bottom." For ease of explanation, Figure 3 does not show the entire structure to which the sheet waterproofing structure is applied, but only partially illustrates the floor and wall portions of the structure. In addition, Figure 3 illustrates the sheet waterproofing structure to improve visibility, so the actual dimensions are significantly different.

[0088] Hereinafter, the second embodiment of the sheet waterproofing structure 10 will be described with reference to this figure, but the differences from the previous embodiment will be mainly described, and explanations of similar points will be omitted.

[0089] The sheet waterproof structure 10 of this embodiment is similar to the sheet waterproof structure 10 of the first embodiment, except that it further includes a waterproof sheet 70 (second waterproof sheet) that partially covers the waterproof sheet 30 (first waterproof sheet).

[0090] That is, as shown in Figure 3, in this embodiment, in the sheet waterproofing structure 10, the waterproof sheet 70 is in the form of a strip and is attached to the waterproof sheet 30 so as to correspond to the step 31 formed in the waterproof sheet 30 that covers the boundary between the floor portion 101 and the bottom portion 51 of the placement member 50.

[0091] In other words, the waterproof sheet 70 is formed as a small piece smaller than the waterproof sheet 30, which allows it to be selectively attached to a part of the waterproof sheet 30.In this embodiment, the waterproof sheet 70 is attached to the waterproof sheet 30 so as to cover the step 31 of the waterproof sheet 30.

[0092] In the area of ​​the waterproof sheet 30 where the step 31 is formed, the waterproof sheet 30 is prone to cracks and breaks due to factors such as the fact that the waterproof sheet 30 is easily subjected to stress and that sand and dust tend to accumulate when rainwater flows over the waterproof sheet 30.

[0093] Therefore, by selectively applying the waterproof sheet 70 to areas where cracks, breaks, etc. have occurred in the step 31 or areas where cracks, breaks, etc. are predicted to occur in the step 31, it is possible to accurately suppress or prevent water from penetrating into the structure 100 itself. In other words, the waterproof sheet 70 functions as a water-stop sheet that prevents water from penetrating into the structure 100 itself through the waterproof sheet 30 where cracks, breaks, etc. have occurred.

[0094] In the second embodiment of the sheet waterproof structure 10 having such a configuration, the waterproof sheet of the present invention can be applied to at least one of the waterproof sheets 30 and 70 provided in the sheet waterproof structure 10, and the waterproof sheets 30 and 70 to which the waterproof sheet of the present invention is applied can obtain the same effects as those described in the first embodiment.

[0095] In this embodiment, the waterproof sheet 70 has been described as having an overall rectangular shape corresponding to the shape of the step 31 of the waterproof sheet 30, but this shape is not limited to this. For example, when the waterproof sheet 70 is selectively attached to the waterproof sheet 30 located at the corner between the floor 101 and wall 102 of the main body 100, the waterproof sheet 70 may be formed into a shape corresponding to the shape of the corner.

[0096] Furthermore, in the sheet-type waterproof structure 10 of this embodiment, a sealing portion (covering layer) may be formed near the edge of the waterproof sheet 70 to bond the waterproof sheet 30 and the waterproof sheet 70 together, with the aim of improving adhesion of the waterproof sheet 70 to the waterproof sheet 30. In this case, the sealing portion can be formed, for example, by applying a cream-like (paste-like) sealant containing a vinyl chloride resin, a plasticizer, and a solvent to the area where the sealing portion is to be formed and then drying it. Furthermore, by including a (meth)acrylic acid ester polymer as a plasticizer in this sealant, i.e., by using the sealant of the present invention as this sealant, the leakage of the plasticizer, i.e., the (meth)acrylic acid ester polymer, can be appropriately suppressed or prevented in the sealing portion formed from the sealant.

[0097] The solvent contained in this sealant is not particularly limited, but examples thereof include hydrocarbon solvents such as n-hexane, toluene, and o-xylene, ketone solvents such as acetone, methyl ethyl ketone (MEK), and cyclohexanone, ester solvents such as ethyl acetate and isobutyl acetate, ether solvents such as diethyl ether and tetrahydrofuran (THF), and alcohol solvents such as methanol, ethanol, and 1-propanol, and one or more of these can be used in combination. By using these solvents, the vinyl chloride resin can be dissolved in the sealant, making the sealant into a cream (paste) state.

[0098] The sealing portion (covering layer) formed using the sealing material is not limited to being formed near the end of the waterproof sheet 70, but may also be formed near the end of the waterproof sheet 30.

[0099] Although the waterproof sheet, resin composition and sealant of the present invention have been described above, the present invention is not limited to these.

[0100] For example, in the waterproof sheet, resin composition and sealant of the present invention, each component can be replaced with any component that can exert a similar function, or any component can be added. [Example]

[0101] Next, specific examples of the present invention will be described. However, the present invention is not limited to the descriptions in these examples.

[0102] 1. Raw material preparation First, the raw materials used in the production of the waterproof sheets of each of the Examples and Comparative Examples are shown below.

[0103] (Vinyl chloride resin) As the vinyl chloride resin, particles (average particle size 1 μm) composed of a vinyl chloride monomer polymer were prepared.

[0104] (Plasticizer 1) As plasticizer 1, a non-functional acrylic acid ester monomer polymer (manufactured by Toagosei Co., Ltd., "Alphon UP-1021") was prepared.

[0105] (Plasticizer 2) As plasticizer 2, a polyester-based plasticizer (manufactured by DIC Corporation, "Polycizer W-2640-S") was prepared.

[0106] (Plasticizer 3) As plasticizer 3, diisononyl phthalate (DINP, manufactured by J-Plus) was prepared.

[0107] (Plasticizer 4) As the plasticizer 4, an ethylene-acrylic acid ester copolymer (manufactured by Mitsui-Dow Polychemicals, "Elvaloy HP441") was prepared.

[0108] (stabilizer) As the stabilizer, a barium-zinc stabilizer (manufactured by Sakai Chemical Industry Co., Ltd.) was prepared.

[0109] (Stabilizing agent) Epoxidized soybean oil (manufactured by ADEKA Corporation, "O-130P") was prepared as a stabilizing aid.

[0110] (ultraviolet absorber) As the ultraviolet absorber, a benzotriazole-based ultraviolet absorber (manufactured by BASF) was prepared.

[0111] (shielding material) Titanium oxide was used as a shielding material.

[0112] (filling material) Calcium carbonate was used as the filler.

[0113] (colorant) Carbon black (Mitsubishi Chemical Corporation, "Mitsubishi Carbon Black #45") was prepared as a coloring material.

[0114] 2. Making a waterproof sheet [Example 1] First, 100.0 parts by weight of vinyl chloride resin, 65.0 parts by weight of plasticizer 1, 6.0 parts by weight of stabilizer, 3.0 parts by weight of stabilizing aid, 0.5 parts by weight of ultraviolet absorber, 15.0 parts by weight of shielding material, 20.0 parts by weight of filler, and 0.4 parts by weight of colorant were mixed uniformly using a mixer at 25°C to obtain resin composition A.

[0115] Next, the resin composition A was heated and kneaded, and then formed into a sheet using a roll to form a heated waterproof sheet, which was then cooled to obtain the waterproof sheet of Example 1. The waterproof sheet of Example 1 had a thickness of 2.0 mm.

[0116] [Examples 2 and 3, Comparative Example 1] The waterproof sheets of Examples 2 and 3 and Comparative Example 1 were prepared in the same manner as in Example 1, except that the type and amount of plasticizer added to resin composition A were changed as shown in Table 1.

[0117] 3. Evaluation The waterproof sheets of each of the Examples and Comparative Examples were evaluated using the following methods. 3-1. Evaluation of migration to butyl rubber tape (Evaluation method B) First, test pieces were prepared from the waterproof sheets of each example and comparative example, measuring 2.0 mm thick x 30 mm wide x 100 mm long, and the elongation percentages [%] of these test pieces were measured as initial elongation percentages [%] based on a tensile test in accordance with JIS A 6008.

[0118] Next, a butyl rubber tape made of butyl rubber and measuring 2.0 mm thick x 35 mm wide x 110 mm long was attached to one side of each test piece based on each example and comparative example, and then these were stored in an oven at 80°C for 28 days, after which the butyl rubber tape was peeled off from each test piece.

[0119] Next, the elongation [%] of each test piece from which the butyl rubber tape had been peeled was measured as the elongation [%] after storage based on a tensile test in accordance with JIS A 6008. The elongation [%] after storage, calculated when the initial elongation was taken as 100.0%, was then determined as the residual plasticizer [%] in the waterproof sheet, and the residual plasticizer B [%] in the obtained waterproof sheet was evaluated based on the following evaluation criteria.

[0120] (Evaluation of plasticizer residual rate in migration evaluation) The residual rate B of plasticizer in the waterproof sheet is ◎: 90.0% or more ○: 80.0% or more but less than 90.0% △: 60.0% or more but less than 80.0% ×: Less than 60.0%

[0121] 3-2. Evaluation of Volatility by Irradiation with a Metal Halide Lamp (Evaluation Method C) First, test pieces were prepared from the waterproof sheets of each example and comparative example, measuring 2.0 mm thick x 50 mm wide x 100 mm long, and the elongation percentages [%] of these test pieces were measured as initial elongation percentages [%] based on a tensile test in accordance with JIS A 6008.

[0122] Next, each test piece based on each example and comparative example was placed on a black panel, and then a metal halide lamp was irradiated onto each test piece at an irradiation intensity of 81 mW / cm. 2 The irradiation was carried out under the following conditions: spray cycle: 2 minutes out of 120 minutes, black panel temperature: 80°C, irradiation time: 1800 hours.

[0123] Next, the elongation [%] of each test piece after irradiation with a metal halide lamp was measured as the elongation [%] after irradiation based on a tensile test in accordance with JIS A 6008. The elongation [%] after irradiation, calculated when the initial elongation was set to 100.0%, was then determined as the residual plasticizer [%] in the waterproof sheet, and the residual plasticizer C [%] in the obtained waterproof sheet was evaluated based on the following evaluation criteria.

[0124] (Evaluation of residual plasticizer rate in volatility evaluation) The residual rate C of plasticizer in the waterproof sheet is ◎: 90.0% or more ○: 80.0% or more but less than 90.0% △: 60.0% or more but less than 80.0% ×: Less than 60.0%

[0125] 3-3. Evaluation of leakage potential by repeated wetting and drying in a muddy state (Evaluation Method A) First, test pieces were prepared from the waterproof sheets of each example and comparative example, measuring 2.0 mm thick x 90 mm long x 90 mm wide, and the weights [g] of these test pieces were measured as the initial weights [g].

[0126] Next, each test piece based on each example and comparative example was mounted in a storage tank 20 shown in FIG. 2 , and then 15 g of mud 82 (JIS Z 8901 test powder 1 (Type 11, manufactured by the Japan Powder Industry and Engineering Association)) and 25 mL of pure water 81 were added to the storage space 26 of this storage tank 20, and the storage tank 20 in this state was then stored in an oven at 80°C for 84 days. At this time, 25 mL of pure water 81 was added every 12 hours, in the morning and evening (twice a day). Thereafter, each test piece was removed from the storage tank 20, washed, and dried.

[0127] Next, the weight [g] of each test piece after repeated wetting and drying was measured as the weight [g] after repeated wetting and drying. The weight [%] after repeated wetting and drying, calculated when the initial weight was 100.0%, was calculated as the residual plasticizer rate [%] in the waterproof sheet, and the residual plasticizer rate A [%] in the obtained waterproof sheet was evaluated based on the following evaluation criteria.

[0128] (Evaluation of the residual rate of plasticizer in leakage evaluation by repeated dry and wet cycles) The residual rate A of plasticizer in the waterproof sheet is ◎: 96.0% or more 〇: 93.0% or more but less than 96.0% △: 90.0% or more but less than 93.0% ×: Less than 90.0%

[0129] 3-4. Evaluation of stain resistance by outdoor exposure First, test pieces were prepared from the waterproof sheets of each example and comparative example, measuring 2.0 mm thick x 60 mm wide x 100 mm long. Each test piece was then placed outdoors in a sunny location and left for 1 year and 6 months.

[0130] Next, the state of staining on each test piece after leaving it was visually observed, and the observed state of staining on the waterproof sheet was evaluated based on the following evaluation criteria.

[0131] (Evaluation of stains on waterproof sheets in stain resistance evaluation) ◎: Almost no dirt is found on the waterproof sheet 〇: There is some dirt on the waterproof sheet, but it is hardly noticeable. △: There is obvious dirt on some parts of the waterproof sheet. ×: Obvious stains are visible on almost the entire surface of the waterproof sheet. The results of these evaluations are shown in Table 1.

[0132] [Table 1]

[0133] As shown in Table 1, the waterproof sheets of each example satisfied the requirement of a residual rate A of the plasticizer of 93.0% or more, and the results indicated that leakage of the plasticizer from the waterproof sheet was suppressed.

[0134] In contrast, the waterproof sheet of the comparative example did not satisfy the requirement that the plasticizer residual rate A be 93.0% or more, and it could not be said that leakage of the plasticizer from the waterproof sheet was prevented. [Explanation of symbols]

[0135] 10 Sheet waterproof structure 20 Reservoir 21 Bottom plate 22 Cover member 23 Gasket 24 clips 25 fixing screws 26 Storage space 30 Tarpaulin 31 Steps 35 test specimens 50 Placement components 51 Bottom 52 Rising surface 70 Tarpaulin 81 Pure water 82 Mud 100 skeleton 101 Floor section 102 Wall section

Claims

1. A waterproof sheet containing a vinyl chloride resin and a plasticizer, which is included in a sheet waterproofing structure that waterproofs a building frame, the plasticizer is a monomer polymer containing, as a monomer component, an alkyl (meth)acrylate, a cycloalkyl (meth)acrylate, or an aryl (meth)acrylate, The plasticizer is contained in the waterproof sheet in an amount of 20.0 parts by weight or more and 90.0 parts by weight or less per 100.0 parts by weight of the vinyl chloride resin, A waterproof sheet characterized in that the residual rate A of the plasticizer measured by the following evaluation method A is 93.0% or more. (Evaluation Method A) First, a first test piece made of the waterproof sheet having dimensions of 2.0 mm thick x 90 mm long x 90 mm wide is prepared, and then the weight [g] of the first test piece is measured as the initial weight. Next, a storage tank is prepared that has a storage space with an upper opening and that can accommodate the first test piece with the surface of the first test piece exposed in a circular shape with a diameter of 60 mm at the bottom of the storage space, and the first test piece is installed in the storage tank. Next, 15 g of mud (JIS Z 8901 test powder 1 (type 11)) and 25 mL of pure water were added to the storage space of the storage tank with the first test piece attached, and the storage tank was then stored in an oven at 80° C. for 84 days, with 25 mL of pure water being added every 12 hours. Next, the first test piece is removed from the storage tank, washed, and dried, and the weight [g] of the first test piece is measured as the weight after repeated wetting and drying. The weight [%] after repeated wetting and drying, calculated when the initial weight is set to 100.0%, is determined as the residual ratio A [%] of the plasticizer.

2. 2. The waterproof sheet according to claim 1, wherein the residual rate B of the plasticizer measured by the following evaluation method B is 80.0% or more. (Evaluation Method B) First, a second test piece made of the waterproof sheet having dimensions of 2.0 mm thick x 30 mm wide x 100 mm long is prepared, and then the elongation percentage [%] of the second test piece is measured as the initial elongation percentage based on a tensile test in accordance with JIS A 6008. Next, a butyl rubber tape made of butyl rubber and measuring 2.0 mm thick x 35 mm wide x 110 mm long is attached to one surface of the second test piece, and then this is stored in an oven at 80°C for 28 days. Next, after the butyl rubber tape is peeled off from the second test piece, the elongation percentage [%] of the second test piece is measured as the elongation percentage after storage based on a tensile test in accordance with JIS A 6008. Then, the elongation percentage [%] after storage, calculated when the initial elongation percentage is set to 100.0%, is determined as the residual percentage B [%] of the plasticizer.

3. The waterproof sheet according to claim 1 or 2, further comprising a stabilizer.

4. The sheet waterproof structure includes a first waterproof sheet that covers at least a portion of a floor portion of the building body and a wall portion that stands upright from the floor portion, The waterproof sheet according to any one of claims 1 to 3, which is applied to the first waterproof sheet.

5. The sheet waterproof structure includes a first waterproof sheet that covers at least a portion of the floor portion of the building body and a wall portion erected from the floor portion, and a second waterproof sheet that covers a portion of the first waterproof sheet, The waterproof sheet according to any one of claims 1 to 4, which is applied to the second waterproof sheet.

6. A resin composition used in molding the waterproof sheet according to any one of claims 1 to 5, A resin composition comprising the vinyl chloride resin and the plasticizer.

7. A sealant used to form a coating layer that selectively covers the vicinity of an end of the waterproof sheet according to any one of claims 1 to 5, A sealant comprising the vinyl chloride resin, the plasticizer, and a solvent.

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