JP3029938B2 - Waterproof sheet for civil engineering construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seepage control sheet for civil engineering construction,
The present invention relates to a seepage control sheet for civil engineering and construction that can prevent water leakage due to tears or the like.

[0002]

2. Description of the Related Art Conventionally, various water-blocking materials have been developed for waterproofing or blocking water inside and outside a reservoir, a waterway, and a building. In general, soft thermoplastic resins such as polyvinyl chloride and polyethylene and ethylene are used. -A sheet material made of synthetic rubber such as propylene rubber and ethylene-propylene-diene rubber is used.

[0003]

These water-impervious sheets are damaged by construction equipment such as a bulldozer at the time of construction, and are also damaged by irregularities, projections, vegetation growth, animal mischief, etc. of the ground after construction. , The waterproofness is impaired. In addition, welding is usually performed by hot air welding during construction, but at this time, if a hole is opened in the overlapped portion of the sheet due to melting of the sheet or thermal deformation occurs, sufficient water shielding and waterproofness will not be obtained . Therefore, a method was considered in which the overlapping portion of the sheet was fixed with nails or metal fittings, but this method would make a hole in the sheet itself, and if a weight was added or pulled by its own weight in the future, the hole would expand, and the water blocking, There is a possibility that waterproofness may not be obtained.
Furthermore, the construction method using hot air welding, nails and metal fittings has a problem in that the work is extremely troublesome and the construction period is prolonged. Accordingly, an object of the present invention is to provide a hole due to a nail or the like during construction, or to stop water in a short time even when it is damaged after construction, and in some cases, to omit a bonding process of an overlapping portion between sheets. Can do,
An object of the present invention is to provide a water-impermeable sheet for civil engineering construction having excellent water-impermeability and waterproofness.

[0004]

The waterproofing sheet for civil engineering and construction according to the present invention is a sheet made of a crosslinked polyethylene oxide alone or a mixture comprising a thermoplastic resin or a synthetic rubber containing at least 90% by weight or more of the crosslinked polyethylene oxide. It is formed by bonding sheets made of thermoplastic resin or synthetic rubber to both surfaces.

The details of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the water-impervious sheet of the present invention. In FIG. 1, 1 is a sheet made of a thermoplastic resin or a synthetic rubber, 2 is a crosslinked polyethylene oxide alone or a crosslinked polyethylene oxide having at least 90%. It is a sheet made of a mixture with a thermoplastic resin or a synthetic rubber containing at least% by weight. FIG. 1 shows a waterproof sheet for civil engineering and construction, in which the above-mentioned sheet 1 is bonded to both sides of the above-mentioned sheet 2 by heat fusion or an adhesive to form an integral composite sheet.

The sheet 1 is used to reinforce the water-impervious sheet of the present invention, and is generally preferably 0.1 to 5 mm in thickness. If it is less than 0.1 mm, the reinforcing effect is small, and if it exceeds 5 mm, the weight becomes heavy and the handling becomes difficult and the construction becomes difficult. Examples of the thermoplastic resin used for forming the sheet 1 include polyvinyl chloride, polyethylene, polypropylene, polyester, and the like. If necessary, for example, 0.3 to 10 parts by weight of a stabilizer may be added to 100 parts by weight of the resin. Parts, plasticizer 5 to 200 parts by weight, and, if necessary, a predetermined amount of a filler, a coloring agent, a lubricant, an antistatic agent, a processing aid, an antioxidant, an ultraviolet inhibitor, a flame retardant, and other resin components. After adding and mixing, the sheet 1 is formed by extrusion or calendering. Also, as synthetic rubber,
Urethane rubber, butyl rubber, chloroprene rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, acrylonitrile-butadiene rubber, styrene-butadiene rubber, fluorine rubber, silicone rubber, acrylic rubber, chlorosulfonated polyethylene, polyepichlorohydrin rubber, etc. . For synthetic rubber, if necessary, for example, 1 to 10 parts by weight of a vulcanizing agent with respect to 100 parts by weight, and if necessary, a vulcanization accelerator, a filler, a coloring agent, an antioxidant, an ultraviolet ray After adding and mixing predetermined amounts of an agent, a flame retardant, and other resin components, the sheet 1 is formed by extrusion or calendering.

On the other hand, the sheet 2 is for imparting water absorbency to the water-shielding sheet of the present invention, and comprises a crosslinked polyethylene oxide alone or a thermoplastic resin or a synthetic rubber containing at least 90% by weight of the crosslinked polyethylene oxide. Each of the powdery substances of the mixture is extruded or formed into a sheet by calendering. Therefore, the thickness of these sheets is more than 0.05mm, especially
When the thickness is less than 0.5 mm, the effect of preventing water leakage due to expansion cannot be obtained, and when it exceeds 5 mm, the sheet itself may be deformed due to expansion.

In the formation of the sheet 2, when a mixture with a thermoplastic resin or a synthetic rubber containing at least 90% by weight of the crosslinked polyethylene oxide is used instead of the single use of the crosslinked polyethylene oxide, It has high water absorption and self-healing properties as in the case of
If the content is more than 10% by weight, the water absorption is so small that the self-healing property is impaired. In this case, the same thermoplastic resin or synthetic rubber as described above is selectively used.

As described above, the waterproof sheet for civil engineering construction according to the present invention is a sheet 2 made of a crosslinked polyethylene oxide alone or a mixture of a thermoplastic resin or a synthetic rubber containing at least 90% by weight or more of the crosslinked polyethylene oxide. A sheet 1 made of a thermoplastic resin or a synthetic rubber is bonded and integrated by heat sealing or an adhesive on both sides. In this connection, the sheet 1, the sheet 2, and the sheet 1 are laminated in this order. Pressing and heating with a press or a press roll and heat-sealing at a temperature of 140 to 200 ° C. In addition, an adhesive may be used between the sheet 1 and the sheet 2 when necessary in this lamination.

[0010]

The present invention provides a waterproof sheet for civil engineering construction according to the present invention, wherein: 1) a sheet made of thermoplastic resin or synthetic rubber bonded to both sides of a sheet made of only cross-linked polyethylene oxide; Even if a hole is created by joining sheets with nails etc. during construction, the cross-linked polyethylene oxide absorbs water leakage from the nail hole and closes the hole by expanding,
Water leakage can be prevented. b) Even when the impermeable sheet is damaged after construction, the crosslinked polyethylene oxide similarly absorbs water and expands, thereby closing the damaged area and preventing water leakage. c) Even if the joining process of the overlapping portions of the sheets is omitted during construction, water leakage from this portion can be similarly prevented. 2) When a sheet made of a mixture of a thermoplastic resin or a synthetic rubber containing at least 90 % by weight of crosslinked polyethylene oxide instead of a sheet using crosslinked polyethylene oxide alone is used as the material of the water-blocking sheet. As in the case of using cross-linked polyethylene oxide alone, water absorption is large and self-healing properties are imparted.

[0011]

EXAMPLES Hereinafter, specific embodiments of the present invention will be described with reference to Examples and Comparative Examples, but the present invention is not limited to the descriptions of these Examples. Examples 1 to 5 and Comparative Examples 1 to 7 (Preparation of Water Absorbent Sheet) After mixing and kneading the components shown in Table 1 with the components and amounts (parts by weight) shown in Table 1, the thickness was adjusted to 1.5 by a calender molding machine.
It was formed into a sheet of mm. The two sheets were stacked and pressed to prepare a sheet having a length of 11 cm, a width of 14 cm, and a thickness of 3 mm, and a sheet having a size of 7 cm in length and 10 cm in width was trimmed. (Preparation of reinforcing sheet) Di-2-
Ethylhexyl phthalate (80 parts by weight) and a barium-zinc stabilizer (2 parts by weight) were added and kneaded, and a 1 mm-thick sheet was formed by a calendering machine.
A 14 cm sheet was trimmed. (Preparation of a water-absorbing sheet) A reinforcing sheet is superimposed on both sides of the water-absorbing sheet one by one so as to cover the water-absorbing sheet, and pressed at 170 ° C. for 5 minutes. Sa5
mm was obtained. Six samples were prepared for each sample.

(Water-proofing test) For each of the obtained six water-proofing sheets, draw a circle having a diameter of 6 cm at the center and further use a drilling machine at the center.
After making holes of 0.2, 0.4, 0.6, 1.0, 1.5 and 2.0 mm and immersing in a water tank containing pure water for 24 hours, as shown in FIG. It is set between the upper and lower flanges 3 and 4, and the presence or absence of leakage of water droplets into the lower tray 7 when water 6 is poured into the upper flange 3 at a height of 20 cm is evaluated according to the following criteria. The results are shown in Table 1. [Evaluation criteria] ・ No leakage ‥‥ ○ ・ Slight water dripping ‥‥ △ ・ Leakage ‥‥ ×

The details of the components in Table 1 used in each example are as follows. -Crosslinked polyethylene oxide-1 (crosslinked PEO in the table)
Aqua Coke NU-40 (manufactured by Sumitomo Seika Co., Ltd., trade name)-Crosslinked polyethylene oxide-2 (crosslinked PEO in the table)
Aqua Coke NU-30 (manufactured by Sumitomo Seika Co., Ltd., trade name)-Polyvinyl chloride resin (referred to as PVC in the table) Polyvinyl chloride resin TK-100 (made by Shin-Etsu Chemical Co., Ltd., trade name) 100 weight In part, di-2-ethylhexyl phthalate 80
1 part by weight and 2 parts by weight of a barium-zinc-based stabilizer. -Polyethylene resin (referred to as PE in the table) Mitsubishi Polyethylene D YF-30 (trade name, manufactured by Mitsubishi Yuka Co., Ltd.)-Ethylene-propylene-diene rubber (EPDM in the table)
JSR EP181SP (Nippon Synthetic Rubber Co., Ltd., trade name)

[0014]

[Table 1]

Example 6 and Comparative Example 8 Using a 20 L supermixer, 100 parts by weight of a polyvinyl chloride resin having an average degree of polymerization of 1,050, 2 parts by weight of a barium-zinc stabilizer and 50 parts of di-2-ethylhexyl phthalate were used.
The weight parts were heated and blended at 120 ° C. to obtain a powder resin. This was formed into a polyvinyl chloride sheet having a thickness of 1 mm using a conventional soft polyvinyl chloride calendering machine, and trimmed to the same size as in the previous example (this is referred to as Comparative Example 6). Next, powdered cross-linked polyethylene oxide: AQUACORK N
100 parts by weight of U-40 (described above) were kneaded by a roll, and sheets having thicknesses of 0.05, 0.5 and 1.5 mm were obtained by a calendering machine. Two 1.5mm thick sheets and 4
Stacked and formed with a press machine, each 3mm thick
And a 5 mm sheet. After trimming each of the obtained sheets to the same size as in the previous example, the polyvinyl chloride sheet was thermocompression-bonded with a press machine in the same manner as in the previous example to obtain a water-blocking sheet according to the present invention (Example 10). A hole having a diameter of 2.0 mm was formed in each of the above water-impervious sheets and the polyvinyl chloride sheet as Comparative Example 6, and the sheets were allowed to stand in water for 24 hours. It was set, and when water was poured into the upper container, the presence or absence of leakage of water droplets and the like into the lower container and the presence or absence of deformation of the sheet were observed. Table 2 shows the above results.

[0016]

[Table 2]

[0017]

According to the waterproofing sheet for civil engineering and construction of the present invention, even if a hole is formed by a nail or the like at the time of construction, or if the sheet is damaged after the construction, it has a self-healing function of closing the hole by water absorption. As a result, the water can be stopped in a short time, and the joining process of the overlapping portion between the sheets can be omitted.

[Brief description of the drawings]

FIG. 1 shows a longitudinal section of an embodiment of the invention for civil engineering construction .

FIG. 2 is a longitudinal sectional view showing an instrument used for a water leakage test of a waterproof sheet for civil engineering and construction .

[Explanation of symbols]

1. Sheet made of thermoplastic resin or synthetic rubber 2.
Crosslinked polyethylene oxide alone or crosslinked polyethylene oxide
A sheet comprising a mixture with a thermoplastic resin or synthetic rubber containing at least 90 % by weight of ethylene oxide , 3
... upper flange, 4 ... lower flange, 5 ... waterproof sheet for civil engineering construction , 6 ... water, 7 ... tray.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeo Tamamura 1 Towada, Kazu-gun, Kashima-gun, Ibaraki Pref. Shin-Etsu Chemical Co., Ltd.PVC Research Institute (72) Inventor Osamu Sodeyama, Kazu-cho, Kashima-gun, Ibaraki No. 1 Wada Shin-Etsu Chemical Co., Ltd. PVC Research Laboratory (56) References JP-A-1-207375 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00- 35/00 E02B 3/12

Claims (1)

(57) [Claims] 1. A sheet made of a thermoplastic resin or a synthetic rubber is bonded to both surfaces of a sheet made of a crosslinked polyethylene oxide or a mixture containing a thermoplastic resin or a synthetic rubber containing at least 90% by weight or more of the crosslinked polyethylene oxide. Waterproof sheet for civil engineering construction.