JP3054799B2 - Impermeable sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a water-impervious sheet, for more information reservoirs, regulating reservoir, park ponds, waste treatment ponds, landfills of industrial waste and general waste of garbage landfill, etc., landfill it relates to the water-impervious sheet of installing the like.

[0002]

2. Description of the Related Art Conventionally, in places where water must be stored, such as reservoirs, regulating ponds, and park ponds, and in wastewater treatment ponds, general waste disposal sites, etc., harmful substances and polluted liquids leach into the ground and become public. It is necessary to install interceptors as necessary so as not to pollute the water area and groundwater. As one of such water impervious works, there is a surface water impervious work, which is generally applied when a base material has a large water permeability and a contaminated liquid or the like is easily leached into the base material. The surface impervious work is a method of covering the entire underlayer consisting of the slope and the bottom with a water impervious film.The material of the water impervious film is a sheet method made of rubber or other elastomer, a method using a spraying material, clay, There are various methods using earth lining method where soil is compacted on loam material, lining with soil cement and asphalt.

[0003] Of these, typical examples of sheets used in the conventional sheet method include an asphalt roofing material and a vulcanized rubber sheet. The asphalt roofing material has a structure in which a reinforcing material made of a nonwoven fabric or a woven fabric made of glass fiber, polyester fiber, or the like is interposed in a rubberized asphalt sheet.

On the other hand, as a vulcanized rubber sheet, a rubber sheet made of ethylene-propylene-terpolymer, butyl rubber or a blend thereof, or a sheet in which an adhesive layer is adhered to one surface of these rubber sheets has been developed. It is widely used because it can be laid sufficiently on a certain ground surface and is easy to construct.

In recent years, as a heat-sealing waterproof sheet layer, a sheet of a polyolefin resin such as polyethylene, polypropylene, ethylene-vinyl acetate (EVA), or a partially or completely cross-linked resin is used. Attention has been paid to a material obtained by blending a monoolefin-based copolymer rubber to impart flexibility, heat resistance and rebound resilience.

[0006]

However, each of these waterproof sheet layers is generally vulnerable to external injuries, and it has been necessary to pay sufficient attention not to damage them during construction. In addition, since the waterproof sheet layer with the reinforcing material interposed therebetween has a small sheet elongation, when the waterproof sheet layer is adhered to the waterproof base surface, the base surface elongation or shrinkage deformation cannot be sufficiently followed. This causes a zero-span tension phenomenon such as cracking or breakage of the sheet, and has the disadvantage of impairing the waterproof function.

[0007] In addition, especially in a rubber processing plant, if a square stone is present on the ground surface, the waterproof sheet layer located thereon is also subject to a risk of cracking due to a load applied from above and is discarded. If a sharp foreign substance such as a metal is mixed in the object, there is a risk that the waterproof sheet may be damaged by this.

The present invention has been made to solve the above-mentioned problems of the conventional waterproofing sheet construction, and in particular, to find a suitable water-shielding sheet to be laid in a garbage landfill or the like and a method for constructing the sheet, thereby improving the waterproofing sheet. Even if a foreign substance enters from the upper side or the lower side and makes a hole, it closes instantly to prevent water leaks, maintain excellent waterproofing function, and cause damage to the tip of rock etc. The purpose is not to be.

[0009]

That is, the feature of the present invention that meets the above-mentioned object is that a sealing layer made of polyurethane is basically provided on a waterproof sheet layer as a waterproof sheet, and a protective layer is further provided. It assumes the seat of the structure provided
JIS K6
A type hardness of 301 is 2 to 50 and elongation is 300%
This is the result of the above polyurethane seal layer . the above
The A-type hardness of JIS K6301 is JIS “vulcanized rubber material”
"5. Hardness test" of "5.
Formula hardness test (A type) ".
Using a test piece of 2 mm or more, “5.2.2 Testing machine”
What was obtained based on "5.2.3 Test method"
It is.

[0010] It should be noted that the rubber layer as the waterproof sheet layer,
There are a resin layer and an asphalt layer, and the protective layer includes a woven fabric, a nonwoven fabric, a rubber layer, a resin layer, and the like. Particularly in the case of the protective layer is <br/> rubber layer, using a foam rubber, the case of a resin, it is preferable to use a resin foam.

[0011]

[0012]

[0013]

[0014]

[0015]

According to the present invention, even if a foreign substance such as a nail or a stone penetrates from one of the protective layer and the waterproof sheet layer to form a hole by applying the above-mentioned waterproof sheet, the above-mentioned seal layer is kept in place. To close the water channel to maintain the waterproof function. Moreover, even if the foreign matter penetrates from the waterproof sheet layer to the seal layer and the protective layer, the through-hole is quickly filled with the seal layer, thereby maintaining an excellent waterproof function. It becomes a waterproof sheet that has a higher waterproof function than before.

[0016]

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show one embodiment of the impermeable sheet according to the present invention.
FIG. 2 is a cross-sectional view showing an example, in which a waterproof sheet 1 has a sealing layer 4 interposed between a waterproof sheet layer 2 and a protective layer 3, and the sealing layer 4 is protected by the waterproof sheet layer 2 and the protective layer 3. The layer 3 is firmly adhered and laminated.

The waterproof sheet layer 2 is disposed closest to the ground when it is laid, and each has a thickness of about 1 to 2 mm. The waterproof sheet layer 2 has a role of a waterproof function among the three-layer laminate. Fulfill.

As the waterproof sheet, synthetic rubber sheets,
Examples include a synthetic resin sheet and a rubber asphalt sheet. Examples of the synthetic rubber-based sheet include styrene-butadiene rubber, chloroprene rubber, nitrile rubber, butyl rubber, ethylene-propylene rubber, chlorosulfonated polyethylene, acrylic rubber, epichlorohydrin rubber, polysulfide rubber, silicone rubber, fluorine rubber, urethane rubber, and the like. Woven or non-woven fabric made of synthetic fiber such as polyester, vinylon, nylon, polypropylene, glass or carbon fiber on one side, both sides or intermediate layer of vulcanized rubber sheet, unvulcanized rubber sheet alone or these rubber layers as main raw material A rubber sheet of a reinforcing type in which a mesh or the like is laminated can be used. In particular, an ethylene-propylene rubber alone, a vulcanized rubber alone in which ethylene-propylene rubber and butyl rubber are blended, or a reinforced vulcanized rubber sheet obtained by combining these with a woven fabric or mesh of polyester fiber is suitable.

As the synthetic resin sheet, polyethylene,
Polyolefin resin such as polypropylene, ethylene vinyl acetate (EVA), chlorinated polyethylene, etc., alone or blended into sheet form, or monoolefin copolymer rubber partially or completely crosslinked with olefin resin What is blended to give flexibility and heat resistance is used.

Examples of the rubber asphalt-based sheet include organic synthetic fibers such as polyester, vinylon, nylon, polypropylene, acrylic, and polyamide, glass, and the like.
As a core material, a woven fabric, a nonwoven fabric, a mesh or the like using inorganic fibers such as carbon is used, and a sheet-like material in which an asphalt-based material is coated thereon is used. Asphalt-based materials for coating include general asphalts such as straight asphalt and blown asphalt, asphalt and SBS (styrene-butadiene-styrene block copolymer), APP (attack polypropylene), and ethylene-propylene random copolymer. Modified asphalt blended with synthetic resin, synthetic rubber such as styrene-butadiene rubber, butyl rubber, or recycled rubber is used. In general, the surface of the coated asphalt is provided with a powder of a mineral substance to prevent adhesion.

The protective layer 3 is provided on the surface of the water-blocking sheet 1 and has a function of protecting the water-blocking sheet 1 from damage caused by a falling object or the like from the outside. A sheet material of a fibrous material such as a woven cloth or a mat, a vulcanized rubber or a synthetic resin, or a foam of a synthetic resin or a synthetic rubber used as a heat insulating material or a heat insulating material is used.

Nonwoven fabrics, woven fabrics and mats made of synthetic fibers such as polyester, vinylon, nylon, polypropylene, acrylic and polyamide are generally used as the fibrous materials, but are particularly formed by spunbonding or needle punching. Nonwoven fabrics and mats are used, but thick ones with a basis weight of 200 g / m ² or more are particularly suitable. In addition, these nonwoven fabrics and mats are laminated with a woven fabric or mesh of a synthetic resin such as polyethylene, polypropylene, or polyester as a reinforcing material, or those with a surface coated with a synthetic resin or synthetic rubber layer and waterproofed. You.

As the sheet, a structure similar to the waterproof sheet can be used as the protective layer. Particularly, a reinforced vulcanized rubber sheet or a synthetic resin sheet such as polyethylene or polypropylene is suitable.

Examples of the foam include a foam of a synthetic resin such as polyethylene, polypropylene, polystyrene, and polyurethane, and a foam of a synthetic rubber such as chloroprene rubber and ethylene-propylene rubber. In particular, expanded polystyrene or expanded polypropylene having excellent compression resistance is suitable.

Further, a sealing layer 4 interposed between the waterproof sheet layer 2 and the protective layer 3 is provided in order to provide the waterproof sheet 1 with a self-sealing property. When the hole 5 is formed by invading from either the sheet layer 2 or the protective layer 3, in the conventional case, as shown in FIG. 6, foreign matter 6 is removed from the waterproof sheet layer 2 ′ to the sealing layer 4 ′ and further protected. In the present invention, the sealing layer 4 closes the layer 3 ′ and keeps the waterproof function by stopping the water channel. Therefore, as shown in FIG.
However, even if the sealing layer 4 penetrates through the sealing layer 4 and the protective layer 3 from the waterproof sheet layer 2, the sealing layer 4 quickly fills the gap between the protective layer 3 and the foreign matter 6, thereby maintaining a high waterproof function.

As described above, the seal layer 4 needs to have an appropriate fluidity and strength in order to impart the self-sealing property to the water-blocking sheet 1, and a preferable example is a prepolymer having an isocyanate group at a terminal. Is a spray-type two-component reaction-curable urethane resin in which a main agent consisting of a resin and a curing agent consisting of a compound containing a polyol or the like are reacted. The urethane resin is of the same type as the urethane resin usually used for applications such as waterproofing of a roof coating film. However, the same resin as that of the related art exhibits a self-sealing property even when used as the seal layer 4 of the present invention. Can not. In order to exhibit sufficient sealing properties, the hardness of the resin after reaction curing (JIS
A type hardness at K6301) is 2 to 50 degrees, more preferably 2 to 20 degrees, and the elongation is 300% or more,
More preferably, those having 600% or more are suitable.

If the hardness of the sealing layer 4 after the reaction curing is less than 2, the sealing layer formed on the slope may be too soft to flow down the slope, and if it exceeds 50, the sealing property may be obtained because it is too hard. Disappears. Among them, the hardness is desirably 2 to 20 in order to obtain a sufficient sealing property. If the elongation is less than 300%, when the foreign matter penetrates the water-blocking sheet, the seal layer does not sufficiently adhere to the foreign matter, and the water path cannot be completely stopped.

[0030] The ratio of the prepolymer and the compound to the Hardness and elongation after reaction curing of the urethane coating material to set the desired range in an equivalent ratio from 0.5 to 20, preferably 0.7
To 1.5, more preferably 0.8 to 1.2.

Further, in the case of the impermeable sheet laid in the waste disposal plant as in the present invention, since the urethane coating material is applied to the steep slope, it is necessary to react and harden the urethane coating material immediately after spraying. It is desirable that the gel time at the time of the reaction between the coating film base agent and the curing agent be within 60 seconds. If the gel time exceeds 60 seconds, the sprayed urethane coating material will flow down the slope, and a uniform sealing layer cannot be obtained.

The prepolymer having an isocyanate group at the terminal, which constitutes the main component of the seal layer 4 made of the urethane coating material, is usually synthesized from an organic polyisocyanate and a polyol having one or more active hydrogen groups.

Examples of the organic polyisocyanate include tolylene diisocyanate (TDI), diphenylmethane-4,4'-diisocyanate (MDI), and diphenylmethane-2,4'-diisocyanate (2,4'-M
DI), naphthalene-1,5-diisocyanate (ND
I), 3,3'-dimethyl-4,4'-biphenylene diisocyanate (TODI), liquid diphenylmethane diisocyanate (liquid MDI) liquefied by various conventionally known methods described in JP-B-38-4576, and the like. Isocyanate crude (crude TDI), polymethylene polyphenyl polyisocyanate (crude MD)
Aromatic polyisocyanates, hexamethylene diisocyanate I) such as (HDI), isophorone diisocyanate (IPDI), bis (isocyanatomethyl) cyclohexane (H ₆ XDI), dicyclohexylmethane -
Include 4,4'-diisocyanate (H _{1 2} MDI) aliphatic including cycloaliphatic, such as polyisocyanates, tetramethyl xylylene diisocyanate (TMXDI), araliphatic polyisocyanates such as xylylene diisocyanate (XDI) is These are used as one kind or as a mixture of two or more kinds.

Examples of the polyol having one or more active hydrogen groups used in combination with the organic polyisocyanate include monools such as methanol, ethanol and 2-ethylhexanol, ethylene glycol, propylene glycol, 1,3 and the like. -Low molecular weight polyols such as butylene glycol, 1,4-butylene glycol, 1,6-hexane glycol, glycols such as trimethylolpropane and neobentyl glycol, and triols such as glycerin; poly (oxypropylene)
Polyether polyols such as polyols, poly (oxyethylene) polyols, poly (oxyethylene propylene) polyols, poly (oxytetramethylene) glycols, polycarbonate polyols such as poly (butylene carbonate) polyols and poly (hexamethylene carbonate) polyols, poly (Caprolactone) polyol, poly (valerolactone) polyol, poly (3-
Methylpentane adipate) diol, poly (ethylene adipate) diol, poly (propylene adipate)
Examples include polyester polyols such as diol, poly (butylene adipate) diol and poly (hexane adipate) diol, and high molecular weight polyols such as polybutadiene polyol. These are used as one kind or as a mixture of two or more kinds. Particularly preferred are poly (oxypropylene), polyol, poly (oxyethylene propylene) polyol, poly (oxytetramethylene) glycol, poly (valerolactone) polyol, poly (3-methylpentane adipate) diol,
Such as polybutadiene polyols, which are usually
Those having an average molecular weight of 200 to 6000 and an average number of functional groups of 1.2 to 6 are desirable.

In addition to the above polyols, for example, aliphatic polyamines such as ethylenediamine, ethylenetriamine, triethylenetetramine, hexamethylenediamine, isophoronediamine, poly (oxyalkylene) polyamine, 4,4'-diphenylmethanediamine, ,
4-tolylenediamine, 2,6-tolylenediamine,
3,5-diethyl-2,4-diaminotoluene, 3,5
-Diethyl-2,6-diaminotoluene, 1,3,5-
Aromatic polyamines such as triethyl-2,6-diaminebenzene can be used.

In the prepolymer having a terminal isocyanate group, the terminal isocyanate group has, for example, an NCO / H equivalent ratio of 1.3 to 1.5 relative to an active hydrogen group such as a polyol.
7 at a reaction temperature of about 40 to 130 ° C and 4 to 10
It can be manufactured by reacting for hours. In this reaction, a conventionally known catalyst, solvent and the like may be used, and further, an additive such as a stabilizer such as benzoyl chloride may be added. Usually, the isocyanate group content of the synthesized prepolymer is 1 to 15%, and particularly preferably 4% or more. Further, the viscosity is 10,000 cps (25 ° C.) or less, and 5000 cps (25 ° C.) is particularly preferable from the viewpoint of workability.

As the compound containing a polyol which acts as a curing agent for the prepolymer having an isocyanate group at the terminal, a polyamine, a plasticizer, and a filler may be blended in addition to the polyol. Good. These may be conventionally known ones and are not particularly limited. For example, as the polyol, the aforementioned low molecular weight polyol or high molecular weight polyol is used. Particularly preferably, butylene glycol, poly (oxypropylene)
Polyol, poly (oxyethylene propylene) polyol, poly (tetramethylene) glycol, poly (caprolactone) polyol, poly (valerolactone) polyol, poly (3-methylpentane adipate) diol, polybutadiene polyol, etc. are used, and these are usually used. , Average molecular weight 80 to 8000, average number of functional groups 1.2 to
Those in the range of 6 are desirable.

As the polyamine, ethylenediamine,
Aliphatic polyamines such as propylene diamine, hexamethylene diamine, hebutamethylene diamine, octamethylene diamine, poly (oxyalkylene) polyamine;
Alicyclic polyamines such as 4,4'-diaminodicyclohexylmethane, isophoronediamine, bisaminomethylcyclohexane, 2,4-tolylenediamine, 2,6-tolylenediamine, 4,4'-diphenylmethanediamine, 3,5 -Diethyl-2,4-diaminotoluene or 3,6-diethyl-2,6-diaminotoluene and mixtures thereof, 1,3,5-triethyl-2,6-diaminobenzene, 4,4'-diamino-3, Examples thereof include aromatic polyamines such as 3'-dichlorodiphenylmethane, and aromatic aliphatic polyamines such as 1,3-bis (aminomethyl) benzene and 1,4-bis (aminomethyl) benzene.

As the plasticizer, dimethyl phthalate,
Diethyl phthalate, dibutyl phthalate, diheptyl phthalate, di-2-ethylhexyl phthalate, diisooctyl phthalate, di-n-octyl phthalate, dinonyl phthalate, diisodecyl phthalate, ditridecyl phthalate, dibutylbenzyl phthalate, dicyclohexyl phthalate Phthalic acid esters such as dioctyl adipate, diisodecyl adipate, dioctyl azelate, dibutyl sebacate, dioctyl sebacate and the like, and glycol esters such as diethylene glycol dibenzoate and diventerythritol hexaester. , Phosphidates such as tricresyl phosphate, trioctyl phosphate, etc., epoxy plasticizers such as epoxidized soybean oil, butyl epoxy stearate, octyl epoxy stearate, etc. And the like. Dibutyl phthalate,
Di-2-ethylhexyl phthalate, diisooctyl phthalate, dioctyl adipate, tricresyl phosphate and the like are preferably used.

As the filler, calcium carbonate, barium carbonate, barium sulfate, talc, baryte, anhydrous gypsum,
Constitutive raw materials such as magnesium carbonate, magnesium hydroxide, mica, zinc white, lead white, lithon, and zinc sulfide are mainly used.

In addition to the above, for example, titanium oxide,
Carbon black, iron oxide, lead chromate, chromium oxide,
Color pigments such as ultramarine, cobalt blue, cyanine blue, cyanine green, lake red, and quinacridone red can also be used.

Examples of additives include amine catalysts such as triethylamine, tripropylamine, N-methylmorpholine, N-octadecylmorpholine, triethanolamine, triethylenediamine, tin acetate, tin octylate, tin oleate, tin laurate. , Dibutyltin diacetate,
Organometallic catalysts such as dibutyltin dilaurate, dibutyltin dichloride, dibutyltin oxide, lead octylate, lead naphthenate, nickel naphthenate, and cobalt octylate; leveling agents such as syringe, fluoro, acrylic, and vinyl; Solvents such as xylene, toluene, and ethyl acetate, other defoamers, thickeners, dispersants, color-coding inhibitors,
Stabilizers and the like are used.

The amounts of the polyol, polyamine, plasticizer, filler and additive in the compound used in the present invention are, for example, 20 to 80% by weight for the polyol, 0 to 40% by weight for the polyamine, 0-10% by weight, 0-50% by weight of filler, 0-5% by weight of additives
Is adjusted so as to be 100% by weight as a whole compound.

Next, an experiment was conducted to confirm the self-sealing property of the sealing layer when a nail or the like penetrated the water-impermeable sheet of the present invention.

The waterproof sheet layer 2 is made of E having a thickness of 2 mm.
Using a PDM-based vulcanized rubber sheet waterproof material ("Mitsu Sheet" manufactured by Mitsuboshi Belting Co., Ltd.), the protective layer 3 is 4 m thick.
m needle-punched nonwoven fabric ("Spunbond 4421NB" manufactured by Toyobo Co., Ltd.) and a reinforced vulcanized rubber sheet ("Mitsusheet S" manufactured by Mitsuboshi Belting Co., Ltd.).

The sealing material constituting the seal layer 4 disposed between the waterproof sheet layer 2 and the protective layer 3 is as shown in Table 1.
A self-sealing property was compared by using a polyurethane sealing material formed by a reaction with various compounding formulations as an example, and using a urethane resin for roof waterproofing (“Neo-Rethane” manufactured by Mitsuboshi Belting Co., Ltd.) as a comparative example. Table 1 shows two types of compounding formulas of the sealing material, and Table 2 shows physical properties of the sealing materials of the two examples and the sealing material used as a comparative example. In addition,
The test method of the self-sealing property was performed as follows.

[0047]

[Self-sealing confirmation test method] The above vulcanized rubber sheet,
A waterproof sheet made using a protective material and a sealing material is attached to a pressurized water leak tester, and a predetermined water pressure is applied from the upper or lower part of the waterproof sheet with three 4 mm-diameter screw nails penetrated to check for water leakage. Was. Table 3 shows the results of Examples 1 to 3 and Comparative Examples 1 to 3 as the test results.

As can be seen from the table, when pressure is applied from the upper part of the waterproof sheet and from the lower part of the waterproof sheet,
Comparative Examples 1 to 3 were 1.0 to 2.0 kgf / cm ² and 0.5 to
While water leakage occurs at 1.0 kgf / cm ² , in Examples 1 to 3 of the present invention, both 5.0 kgf / cm ² and 3.0 kgf / c ²
With m ² , there is still no water leakage, and the self-sealing property is much better. Below margin

[0049]

[Table 1]

[0050]

[Table 2] Below margin

[0051]

[Table 3] Below margin

Next, FIGS. 3 and 4 show a construction method using the present invention <br/> water shield sheet 1 described above, the following, with reference to these figures will be described impervious method.

First, as shown in the figure, a waterproof sheet layer 2 made of vulcanized rubber is laid on a base 5 consisting of a slope 5a and a bottom face 5b. A roll of a protective layer 3 having weather resistance and waterproofness on the surface is placed on the end of the waterproof sheet layer 2 on the slope 5 a, and the two-liquid reaction described above as the seal layer 4 is performed. The curable urethane coating material is sprayed and applied to the upper surface of the waterproof sheet layer 2 made of vulcanized rubber, and is sequentially wound into the above-mentioned roll shape from the place where the seal layer 4 is formed as shown in FIG. Protective layers 3 are sequentially laid.

The two-component reaction-curable urethane resin used as the seal layer 4 has an adhesive property, and is integrally bonded to the waterproof sheet layer 2 by spraying it onto the waterproof sheet layer 2 with a spray 7. The laying of the protective layer 4 may be performed during the reaction curing of the urethane coating material, or may be performed after the reaction curing because the adhesive has adhesiveness even after the reaction curing after spraying is completed. A sufficient adhesive strength can be obtained.

[0055]

As described above, the impermeable sheet of the present invention is
Even when a foreign substance such as a nail or a stone penetrates from either the protective layer or the waterproof sheet layer to form a hole, the seal layer flows and closes the hole instantly, stopping the water channel and providing a waterproof function. Will be maintained, and even if the foreign matter penetrates through the sealing layer and the protective layer from the waterproof sheet layer,
The sealing layer fills the gap between the penetrated hole and the foreign material, maintaining the waterproof function, and as a waterproof sheet having a higher waterproof function than before, industrial waste such as landfills It can be laid satisfactorily at the final disposal site.

[0056]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one example of a water impermeable sheet according to the present invention.

FIG. 2 is a cross-sectional view showing an example of another impermeable sheet according to the present invention.

FIG. 3 is a cross-sectional view illustrating an example of a process of a method for applying a water-blocking sheet according to the present invention.

FIG. 4 is a sectional view showing a step following the step shown in FIG. 3 of the method for constructing a water-blocking sheet according to the present invention.

FIG. 5 is an enlarged view showing a state in which a foreign matter has penetrated the water impermeable sheet shown in FIG.

FIG. 6 is an enlarged view showing a state in which a foreign matter has penetrated a conventional waterproof sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterproof sheet 2 Waterproof sheet layer 3 Protective layer 4 Seal layer 5 Base 5a Slope 5b Bottom 6 Foreign matter 7 Spray

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sada Ikeda 4-1-1-21 Hamazoedori, Nagata-ku, Kobe Mitsuboshi Belting Co., Ltd. (56) References JP-A-62-73944 (JP, A) Hei 7-232408 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 B05D 1/00-7/26 B09B 1/00 E02B 3/18 E02B 7/02 E02D 31/02

Claims (3)

(57) [Claims] 1. A seal layer made of polyurethane is provided on a waterproof sheet layer, a protective layer is further provided, and a seal layer made of polyurethane according to JIS K6301 A
A water impermeable sheet having a shape hardness of 2 to 50 and an elongation of 300% or more. 2. The waterproof sheet according to claim 1, wherein the protective layer is a rubber foam layer. 3. The waterproof sheet according to claim 1, wherein the protective layer is a resin foam layer.