JPH10331112A - Water-leakage preventing material for covering plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water leakage such as rain water from a gap between covering plates without hindrance to the traffics of vehicles and people by providing a water-absorptive complex containing at least water-absorptive polymer. SOLUTION: A water leakage preventing material 4 is provided with a water- absorptive complex containing at least water-absorptive polymer. Monomer which can be transformed into water-absorptive monomer by polymerization from the points of water-absorptive swelling property, durability, ease of manufacture and profittability is deposited onto a base material and then compressed while being polymerized on the base material to obtain a water-absorptive complex. The water leakage preventing material 4 for a covering plate for which an adhesive layer is provided on the water-absorptive complex is constructed and installed on the covering plate 1, before placed thereon. In this way, easy storage and transportation are ensured, handling work in construction is conveniently done, the density of the complex obtained by compression is increased and constructing work including pasting and cutting operation is more easily done.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water leakage preventing material for a lining board. More specifically, the present invention relates to a water leakage preventing material for a lining plate which can cut a road during subway construction or the like and prevent water such as rainwater from leaking from a gap between lining plates laid as a temporary road.

[0002]

2. Description of the Related Art Conventionally, in excavation works such as subway construction, underground shopping mall construction, and sewer construction, the ground surface shown in FIGS.
As shown in (1), a plurality of lining boards 1 are laid to form a temporary road surface and a temporary floor. FIG. 1 is a top view of a state in which lining plates are arranged, and FIG.
It is sectional drawing. However, in rainy weather, rainwater leaks from the gap 2 between the lining plates 1 and falls down to a construction site below, often causing trouble such as interruption of construction. This problem is particularly serious in the gap 2 a having no receiving girder 3 below the gap 2 as compared with the gap 2 b having the receiving girder 3.

In order to prevent this, a method has been considered in which the entire surface of the laid lining plate is covered with a waterproof sheet. However, there is a problem in that traffic of vehicles and people is hindered, and the sheet itself is damaged by the traffic. was there. In addition, Japanese Patent Laid-Open No. 7-1
Japanese Patent No. 39187 proposes a method in which a joint material containing a polyurethane-based adhesive as a main component is applied to a gap between lining plates and cured. However, the gap between the lining plates is not constant due to the traffic of the vehicle, and the interval between the gaps greatly fluctuates with time. Water leakage prevention was insufficient. In addition, the work of applying the joint material to the gap between the lining plates is time-consuming and complicated. Further, there is a problem that it is not easy to peel the joint material from the lining plate, and the work (cleaning) at the time of reuse is complicated.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent water such as rainwater from leaking from a gap between lining plates without hindering traffic of vehicles and people, and An object of the present invention is to provide a lining board water leakage preventing material which is capable of coping with a change in a gap interval with time and which is excellent in workability.

[0005]

Means for Solving the Problems In order to solve the above-mentioned problems, a water leakage preventing material for a lining board according to the present invention is characterized by comprising a water-absorbing composite containing at least a water-absorbing polymer. Further, in the above, the water-absorbing composite is characterized by being obtained by polymerizing a water-soluble unsaturated monomer on a substrate. In the above, the base material is a sponge base material.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The water leakage preventing material of the present invention only needs to include a water-absorbing composite containing at least a water-absorbing polymer, and examples of the water-absorbing composite include the following types. A) A water-absorbing composite obtained by coating a water-absorbing polymer on a substrate such as a water-permeable nonwoven fabric or sponge. B) A water-absorbing composite obtained by directly pressing a water-absorbing polymer softened with water on a substrate such as a nonwoven fabric or a sponge, and drying as necessary. C) A water-absorbing composite obtained by attaching a water-absorbing polymer to a substrate such as a nonwoven fabric or a sponge using a bonding agent. D) A water-absorbing composite obtained by applying a water-soluble polymer such as sodium polyacrylate which can be converted to a water-absorbing polymer to a substrate and then crosslinking the substrate. E) A water-absorbing composite obtained by applying a water-soluble unsaturated monomer such as a metal acrylate monomer, which can be converted into a water-absorbing polymer by polymerization, to a base material and then polymerizing the base material. And the like.

[0007] Above all, from the viewpoint of water absorption swelling property, durability, ease of production and economy, a monomer which can be converted into a water-absorbing polymer by polymerization is adhered to a substrate, and then the monomer is polymerized on the substrate. The water-absorbing composite obtained by the above method is preferable.
In the present invention, the water-absorbing composite may be used as it is, but is preferably compressed. By being compressed, the thickness of the water-absorbing composite becomes thin,
Transport is easy and handling work during construction is simplified. In addition, the density of the water-absorbing composite obtained by the compression increases, and "strain" appears in the texture, so that the construction work such as pasting and cutting is further facilitated.

The method for compressing the water-absorbing composite includes: (1) a method for compressing the obtained water-absorbing composite. If necessary, the water-absorbing polymer fixing the obtained water-absorbing composite to the substrate may be softened with water, a water-soluble bonding agent may be used, or the material may be compressed while heating. In addition, a known method can be adopted as the compression method, but a method of winding with a strong tension and compressing with a winder is preferable from the viewpoint of productivity and workability. (2) A method of producing a water-absorbing composite using the compressed base material by compressing the base material before polymerization to make it thinner. (3) A method in which, when a water-soluble unsaturated monomer that can be converted into a water-absorbing polymer by polymerization is polymerized on a substrate, the substrate to which the monomer is attached is compressed. (Simultaneous polymerization and compression) (4) A method of compressing a substrate to which the water-soluble polymer or the like has adhered when the water-soluble polymer or the like is adhered to the substrate and cross-linked on the substrate. (Simultaneous crosslinking and compression).

In the method of compressing a monomer while polymerizing it on a substrate, the resulting water-absorbing polymer itself serves as a bonding agent, so that the compressed shape can be maintained without using another bonding agent. Therefore, the polymerization and compression steps can be performed in one step, and excellent water-absorbing swelling properties are exhibited because other bonding agents that inhibit water-absorbing swelling are not used. For this reason, the method of compressing the monomer while polymerizing it on the substrate is most preferable. When the compressed water-absorbing composite comes into contact with water, the compressed form is released due to the water-absorbing swelling of the water-absorbing polymer, and the composite expands in volume.

In the method of compressing a water-soluble polymer or the like while crosslinking it on a substrate, the water-absorbing polymer itself produced by the crosslinking acts as a bonding agent and maintains a compressed shape. Therefore, the step of producing the water-absorbing polymer by crosslinking and the step of compressing can be performed in one step. In addition, since no other bonding agent is used, excellent water swelling properties are exhibited. For this reason, a method of compressing while crosslinking a water-soluble polymer or the like is also preferable.

[0011] The degree of compression may be such that the thickness is reduced to a level that facilitates handling. Generally, the thickness is in the range of 2/3 to 1/100 of the thickness of the base material under normal conditions. In particular, the range of 1/2 to 1/10 is preferable. When the value of the degree of compression is more than 2/3 and the thickness is large, handling may be complicated. When the value is less than 1/100, the swelling property may be reduced due to water absorption swelling, or the film may become hard and difficult to handle.

When the water-absorbing composite of the present invention is compressed and thinned, the compressed state is released by contact with moisture, and the water-absorbing composite swells to a thickness equal to or greater than the original base material thickness in a normal state. The degree of swelling is preferably 1.5 times or more, more preferably 2 times or more, the thickness at the time of compression. If the ratio is less than 1.5 times, the closing property when closing the gap between the lining plates is reduced.

As the substrate used in the present invention, for example, a porous material such as hydrophilic or hydrophobic woven fabric, nonwoven fabric, paper, knitted fabric, sponge and the like can be mentioned. It is preferable that the base material has voids therein, because a space allowing swelling of the water-absorbing polymer can be secured and water can effectively contact the water-absorbing polymer. The shape is preferably a sheet or a tape from the viewpoint of handleability.

As a material used as a base material, when the base material is a fiber base material, as a hydrophilic material, wood pulp,
Fibers such as cotton, wool, rayon, acetate, vinylon, etc. are listed, and hydrophobic ones include fibers such as polyester, acrylic, nylon, polypropylene, polyethylene, polyurethane, glass wool, rock wool, metal fibers (metal wool), and shapes. Memory alloy fibers can be mentioned.

When the substrate is in the form of a sponge, a polyurethane sponge, a cellulose sponge, a viscose sponge, a polyvinyl alcohol sponge, a polyethylene foam, a polypropylene foam, a rubber sponge, a polyvinyl acetal sponge, a polyacetal sponge. Sponge, phenol resin sponge, metal sponge and the like can be mentioned.

Further, a composite of two or more of the above-mentioned substrates can be used. Further, the above-mentioned colored or flame-retardant base material can also be used. Above all, the water-absorbing composite obtained has a water-absorbing swelling property (expandability) and an expanded form,
A sponge base material having high compression-restoring elasticity is preferable from the viewpoints of closing properties of gaps between the lining plates, water stopping properties, water leakage preventing properties, and the like, and among them, it is preferable to use a cellulose sponge base or a polyurethane sponge base.

Since the sponge substrate has voids of open cells and has a large surface area in contact with water, the resulting water-absorbing composite has a high water absorption rate. Further, due to the combination of the cell space and the water-absorbing swelling property of the water-absorbing polymer, extremely high water retention is exhibited. Therefore, when a sponge substrate is used, extremely high water absorption swelling property is exhibited. Further, by using a base material having high compression restoring elasticity, the water-absorbing composite of the present invention has a very rapid volume expansion due to water absorbing swelling due to a high water absorbing swelling property and a restoring elastic force of the substrate when a liquid is added. Is expressed. After swelling once, even if the base material is dried due to high compression restoring elasticity, almost no shrinkage occurs, and thereafter, the expanded form is maintained.

As described above, the term "maintain the expanded state" refers to a state in which the expanded state is maintained without shrinkage due to the compression-restoring elasticity of the base material even after drying after volume expansion due to water absorption and swelling. That is, a state in which a thickness of 60% or more of the thickness at the time of maximum expansion is maintained. 8 among them
The state in which the thickness is maintained at 0% or more is preferable from the viewpoint of the obstruction between the lining plates, and particularly preferable is 90% or more.

The maximum expansion thickness of the water-absorbent composite used in the present invention when absorbing water is equal to or greater than the original thickness of the base material under normal conditions. Here, the normal thickness of the substrate refers to the thickness of the substrate before the formation of the water-absorbing composite, which is sufficiently contacted with water and air-dried under no load. As the substrate used in the present invention, those having a high compression restoring elasticity as described above are preferable, but those having a compression elasticity ratio of 3 or more, preferably 5 or more, as shown below, are suitably used. If the compression elasticity ratio is less than 3, the resulting water-absorbing composite may not be able to sufficiently maintain the expanded form.

Here, the compression elasticity ratio was determined by the following equation. Compression elasticity ratio = (T2−T1) / T1 T1: Thickness when 15 substrates are stacked and a load of 10 kgf / 20 cm ² is applied for 1 minute T2: After removing the load after T1 measurement and leaving for 1 minute, 30
Thickness when a load of gf / 20 cm ² is applied for 1 minute When the water-absorbing composite compressed in the present invention is interposed in the gap between the lining plates, the gap is fitted in the gap by contact with water. Is closed, the expanded state of the water-absorbing composite is maintained even when the composite is dried, and the gap can be kept closed for a long period of time. Therefore, when the compressed water-absorbing composite is used, extremely high water stopping properties and water leakage preventing properties are exhibited.

The thickness of the substrate used in the present invention in a normal state is not particularly limited, but is generally in the range of 0.2 mm to 100 mm, and particularly preferably 2 mm to 10 mm. If it is less than 0.2 mm, the resulting water-absorbent composite may have reduced swellability and material strength due to water absorption and swelling, and if it exceeds 100 mm, handling becomes complicated. As the water-absorbing polymer to be fixed to the base material, for example, a water-soluble ethylenically unsaturated monomer containing acrylic acid or an acrylate or a sulfonic acid group-containing acrylate as a main component and optionally adding a crosslinking agent And a water-absorbing polymer which absorbs water of 10 to 1000 times its own weight and swells, and is preferably used.

Examples other than the above-mentioned water-absorbing polymer include:
For example, crosslinked polydioxolane, crosslinked polyethylene oxide, crosslinked polyvinylpyrrolidone, crosslinked sulfonated polystyrene, crosslinked polyvinylpyridine, saponified starch-poly (meth) acrylonitrile graft copolymer, starch-poly (meth) acrylic acid (and Examples thereof include water-absorbing polymers such as a salt thereof, a graft crosslinked copolymer, a reaction product of polyvinyl alcohol and maleic anhydride (salt), a crosslinked polyvinyl alcohol sulfonate, and a polyvinyl alcohol-acrylic acid graft copolymer.

In the present invention, the weight ratio of the water-absorbing polymer to the substrate is preferably in the range of 10 to 1000 parts by weight of the water-absorbing polymer based on 100 parts by weight of the substrate. When the amount of the water-absorbing polymer is less than 10 parts by weight, the water-absorbing swelling property is low. On the other hand, when the amount is more than 1000 parts by weight, the polymer is desorbed from the substrate of the water-absorbing composite or the flexibility is low. It is not preferable from the viewpoint of workability.

The water-absorbing composite of the present invention obtained by a method in which a monomer which can be converted into a water-absorbing polymer by polymerization is adhered to a substrate, and then the monomer is polymerized on the substrate,
As described above, it is preferable from the viewpoints of water absorption swellability, durability, ease of production, and economy, and has the following effects. (1) It shows high water absorption and swelling because it does not use binders such as adhesives, pressure-sensitive adhesives, and rubber that inhibit water absorption and swelling. (2) Since the water-absorbing polymer is firmly fixed directly to the base material itself, the polymer does not fall off very little and does not contaminate the periphery. (3) Since it is in the form of a sheet, it is easy to handle, further processing and construction work is simple, and disposal and removal after use are easy. (4) Since the monomer is directly attached to the base material by impregnation or the like, the polymer can be uniformly formed on the entire base material (surface and inside). Therefore, it shows high water absorption swelling without unevenness in water absorption swelling.

Specific examples of the monomer to be attached to the substrate include, for example, acrylic acid, methacrylic acid, itaconic acid,
Maleic acid, fumaric acid, crotonic acid, citraconic acid,
Vinylsulfonic acid, (meth) allylsulfonic acid, 2-
(Meth) acrylamide-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-
(Meth) acryloylpropanesulfonic acid, (meth) allylsulfonic acid, and their alkali metal salts and ammonium salts; N, N'-dimethylaminoethyl (meth) acrylate and its quaternary product, (meth) acrylamide, N , N'dimethyl (meth) acrylamide,
2-hydroxyethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, hydroxyalkyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, polyalkylene glycol ( Meth) acrylates, and one or two of these
More than one species can be used.

From the viewpoint of the water-swelling property of the water-absorbing composite, acrylic acid, methacrylic acid, and alkali metal salts and ammonium salts thereof are preferably used. Further, in order to maintain a high water absorption swelling over a long period of time, a monomer from which a salt-resistant or nonionic water-absorbing polymer is obtained by polymerization, acrylic acid, methacrylic acid, and,
It is particularly preferred to copolymerize these alkali metal salts and ammonium salts.

Examples of the salt-resistant or nonionic monomer include 2- (meth) acryloylethanesulfonic acid and 2
-(Meth) acryloylpropanesulfonic acid, 2- (meth) acrylamido-2-methylpropanesulfonic acid and water-soluble ethylenically unsaturated monomers having a sulfonic acid group such as alkali metal salts and ammonium salts thereof,
(Meth) acrylamide such as (meth) acrylamide, (meth) acryloylmorpholine, diacetone (meth) acrylamide, N-isopropyl (meth) acrylamide, N, N'-dimethyl (meth) acrylamide and derivatives thereof; polyethylene glycol (meth) Polyalkylene glycol (meth) acrylate represented by acrylate or methoxypolyethylene glycol (meth) acrylate; hydroxyalkyl (meth) acrylate represented by hydroxyethyl (meth) acrylate or hydroxypropyl (meth) acrylate; N-vinyl N-vinyl monomers represented by pyrrolidone and N-vinylsuccinimide; N-vinylformamide, N-vinyl-N-methylformamide, N-vinylacetamide, N-vinyl N-vinylamide monomers such as -N-methylacetamide: vinyl methyl ether and the like.

Among them, one or more selected from acrylamide, methacrylamide, methoxypolyethylene glycol (meth) acrylate, and hydroxyalkyl (meth) acrylate are preferably used. The monomer to be adhered to the base material may be used as a 100% component or in the form of an aqueous solution. The monomer concentration when handled as an aqueous solution is preferably in the range of 2% by weight or more and less than 90% by weight, more preferably 20% by weight.
% By weight or more and less than 50% by weight. When the amount is less than 2% by weight, the polymerizability decreases, and when the amount is more than 90% by weight, the water-absorbing swellability of the obtained water-absorbing composite decreases.

If necessary, the monomer aqueous solution may contain
A crosslinking agent, a polymerization initiator, a thickener such as hydroxyethylcellulose, and additives such as a water-soluble polymer, a water-absorbing polymer powder, and a moisture-absorbing / wetting agent may be added. The aqueous monomer solution may be one in which a small amount of a water-soluble organic solvent is dissolved. In particular, it is preferable to add a water-absorbing polymer powder since the water-absorbing swellability of the resulting water-absorbing composite is improved. From the viewpoint of water-absorbing swelling and mixing with the monomer, the water-absorbing polymer powder has a particle size of 150 μm or less, more preferably 7 μm or less.
Those having a size of 5 μm or less are preferably used.

As the crosslinking agent, a copolymerizable polyfunctional water-soluble ethylenically unsaturated monomer or a compound capable of reacting with a functional group of the monomer can be used. It can be added to the above monomer, previously applied to a substrate and adhered thereto, or added after polymerization. Specific examples of the crosslinking agent include N, N'-methylenebis (meth)
Examples include acrylamide and polyethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, polyalkylene glycol, polyalkylene glycol diglycidyl ether, polyhydric alcohol, polyepoxy compound, polyamine, and alkylene carbonate.

The use of a crosslinking agent can improve the durability, shape retention and water swellability of the resulting water-absorbing composite. The amount of the cross-linking agent can be appropriately selected depending on the type of the monomer and the polymerization conditions.
It is in the range of 1 to 10 mol% (relative to monomer), preferably in the range of 0.01 to 5 mol% (relative to monomer). If the amount is less than 0.001 mol%, the water-absorbing polymer may be detached from the substrate, and if it is more than 10 mol%, the water-absorbing swelling property and the polymerizability are undesirably reduced.

In order to promote the polymerization, it is preferable to use a polymerization initiator. The polymerization initiator used in the present invention is an oxidizing or azo radical polymerization initiator which is water-soluble or water-miscible / dispersible with water, and one or more of these initiators may be used. Further, a redox initiator may be used by adding a reducing substance. Furthermore, the azo initiator, the oxidizing initiator and the reducing substance may be combined to form a ternary initiator, which is particularly preferable from the viewpoints of polymerizability and water swellability.

The method of adding a reducing substance after adding an azo-based initiator and an oxidizing initiator to a monomer and adhering to the substrate has a good stability of the monomer and is easy to handle. Further, the monomer and the above three components may be mixed and sprayed on the base material immediately before being attached to the base material using a screw nozzle. Examples of the oxidative polymerization initiator include persulfates such as sodium persulfate, potassium persulfate and ammonium persulfate; inorganic peroxides such as hydrogen peroxide; organic peroxides such as di-tert-butyl peroxide and acetyl peroxide. No.

As the azo polymerization initiator, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-
Azobis (N, N 'dimethyleneisobutylamidine) 2
Examples include azo compounds such as hydrochloride and 4,4'-azobis (4-cyanovaleric acid). Examples of the reducing substance include a sulfite, L-ascorbic acid, an amine and the like. The reducing substance forms an oxidation-reduction system with the oxidizing polymerization initiator and promotes its decomposition. This is known as a redox initiator.

The amount of the polymerization initiator to be added is generally 0.001 g / mol or more and less than 10 g / mol with respect to the monomer, but from the viewpoints of polymerizability, economy and discoloration, 0.1 g / mol.
/ Mol or more and less than 5 g / mol. When the addition amount is less than 0.001 g / mol, the polymerizability is reduced, and a large amount of unreacted monomer may remain. When the addition amount is more than 10 g / mol, the water-absorbing swellability of the obtained water-absorbing polymer sheet is reduced. However, there is a problem in economics.

As a method for attaching the monomer to the substrate, any known means can be used as long as the monomer can be uniformly or desirably dispersed and maintained on the substrate and polymerized. Specifically, it means impregnating, spraying, coating or printing a substrate with an aqueous monomer solution. Further, if necessary, after spraying, impregnating, coating or printing, it can be squeezed out with a roller or the like to control the amount of monomer adhesion. The aqueous monomer solution can adhere to the entire surface of the substrate, or can adhere to only one surface. A concentration gradient can be given in the thickness direction of the substrate. Also,
The monomer aqueous solution can be attached in a dot, stripe, lattice, or other pattern.

The monomer adhered to the substrate is polymerized by a known means, and the water-absorbing polymer can be directly fixed to the substrate.
As a method of polymerizing a monomer, for example, heat, light, γ
A method using a beam, an electron beam, an ultraviolet ray, a microwave, or the like can be employed. Above all, from the viewpoints of compression processability, productivity, and polymerizability, a method in which the base material to which the monomer is attached is sandwiched while being pressed with an inert belt and heated and polymerized is preferred.

The thickness of the water-absorbing composite in the present invention is preferably as thin as possible in order to improve the handleability. The thickness of the water-absorbing composite used in the present invention is 0.1.
0.2 mm to 5 m in the range of 1 mm or more and less than 10 mm
The range of m is preferred. If it is less than 0.1 mm, the water-absorbing swelling property is reduced, and if it is 10 mm or more, the handleability is reduced, and the work, storage, and transportation during processing and construction are undesirably complicated.

The water-absorbing composite thus obtained is
Although it can be used alone as a water leakage preventing material for a lining board, at least a part of the composite may be provided with a pressure-sensitive adhesive or an adhesive, or may be composited with a nonwoven fabric or a film as long as the water-absorbing swelling property of the sheet is not impaired. The method of interposing the water leakage preventing material for lining plate of the present invention in the gap between the lining plates is as follows. (1) The water leakage preventing material for lining plate of the present invention is pushed into the gap between the laid lining plates and filled. how to. (2) A method in which an elongated wooden plate or bar coated with the water leakage preventing material for a lining plate of the present invention is inserted into a gap between the lining plates. (3) A method in which the water leakage prevention material for a lining board of the present invention to which an adhesive or an adhesive is applied is pasted on the side of the lining board before laying. (4) A method of covering and adhering the gap with the water leakage preventing material for a lining plate of the present invention to which an adhesive or an adhesive has been applied after laying. And the like. In particular, it is necessary to construct and install a water leakage prevention material for a lining board provided with an adhesive layer on the water-absorbing composite as in method (3) before laying it on the lining board. Is preferred.

As a preferred embodiment of the water leakage preventing material for a lining board of the present invention, an adhesive layer containing a crosslinking component capable of reacting with the water-absorbing polymer and the adhesive is provided on one surface of the water-absorbing composite to which the water-absorbing polymer is fixed. The provided water leakage preventing material for the lining plate is provided. Examples of the pressure-sensitive adhesive used in the present invention include an acrylic pressure-sensitive adhesive. The pressure-sensitive adhesive may be either a water-soluble emulsion type or a solvent type, but is preferably a solvent type in terms of durability.

The acrylic solvent-based pressure-sensitive adhesive that can be used in the present invention is, for example, one or two alkyl (meth) acrylates having 1 to 14 carbon atoms in the alkyl group from the viewpoint of adhesive strength and durability. At least one species (which is a main component); an ethylenically unsaturated monomer having a functional group capable of reacting with a crosslinking component capable of reacting with a water-absorbing polymer and a pressure-sensitive adhesive; and, if necessary, other ethylenically unsaturated monomer. A copolymer having a glass transition point of −20 ° C. or lower and a molecular weight of from 100,000 to 1,000,000, and an organic solvent capable of dissolving or dispersing the copolymer. It is preferably a solution or a dispersion.

Examples of the alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms include, for example,
Methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, sec-butyl (meth) acrylate ,
Tert-butyl (meth) acrylate, amyl (meth) acrylate, isoamyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate,
Heptyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate And one or more of these, such as dodecyl (meth) acrylate.

As the ethylenically unsaturated monomer having a functional group capable of reacting with a crosslinking component capable of reacting with a water-absorbing polymer and a pressure-sensitive adhesive, a monomer having a carboxyl group and a hydroxyl group is particularly preferred. Examples of the monomer having such a functional group include carboxyl groups such as (meth) acrylic acid, itaconic acid, monoalkyl esters of itaconic acid, maleic acid, maleic anhydride, monoalkyl esters of maleic acid, and fumaric acid. Hydroxyl-containing ethylenically unsaturated monomers such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, and caprolactone-modified hydroxy (meth) acrylate. Among them, one or more selected from (meth) acrylic acid, hydroxyethyl (meth) acrylate, and caprolactone-modified hydroxy (meth) acrylate are preferable.

Other ethylenically unsaturated monomers include, for example, aliphatic unsaturated hydrocarbons such as ethylene and butadiene; halogen-substituted aliphatic unsaturated hydrocarbons such as vinyl chloride; styrene, α-methyl Aromatic unsaturated hydrocarbons such as styrene; vinyl esters such as vinyl acetate; vinyl ethers; esters of allyl alcohol with various organic acids and esters with various alcohols; unsaturated cyanide compounds such as acrylonitrile; acrylamide Unsaturated amide compounds such as butoxyethyl (meth) acrylate, various esters of unsaturated monobasic carboxylic acids such as methacrylic acid and crotonic acid, and various diesters of unsaturated dibasic carboxylic acids such as maleic acid and fumaric acid Etc., and use one or more selected from these. It can be.

[0045] The alkyl (meth) acrylate having 1 to 14 carbon atoms in the alkyl group, an ethylenically unsaturated monomer having a functional group capable of reacting with a crosslinking component capable of reacting with a water-absorbing polymer and a pressure-sensitive adhesive, and the like. The proportion of the ethylenically unsaturated monomer used is not particularly limited, but is, for example, 0.01 to 20 parts by weight of a monomer having a functional group capable of reacting with a crosslinking component with respect to 100 parts by weight of an alkyl (meth) acrylate. Parts, 0 to 30 parts by weight of other monomers. Outside of these ranges, it may be difficult to exhibit sufficient performance such as adhesive strength as an adhesive.

As the organic solvent used for the pressure-sensitive adhesive, any conventionally known organic solvent can be used as long as it can dissolve or disperse the above-mentioned copolymer. May be. From the viewpoint of ease of production and storage stability of the acrylic solvent-type pressure-sensitive adhesive, it is preferable to use a solvent that dissolves the copolymer to form a solution. Organic solvents for obtaining such a solution include toluene, ethyl acetate and the like. The ratio between the copolymer and the organic solvent is, for example, 50 to 300 parts by weight of the organic solvent with respect to 100 parts by weight of the copolymer, but is not limited thereto.

The acrylic solvent-based pressure-sensitive adhesive used in the present invention may be prepared by a known method, including the alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms, a monomer capable of reacting with a crosslinking component, It is preferable to perform solution polymerization of other monomers in the presence of an organic solvent, but it is preferable to dissolve the other monomers in an organic solvent after isolating a copolymer obtained by, for example, emulsion polymerization, suspension polymerization, or bulk polymerization. Can also.

Examples of the crosslinking component capable of reacting with the water-absorbing polymer and the pressure-sensitive adhesive include compounds having two or more isocyanate groups, compounds having two or more epoxy groups, melamine compounds, guanamine compounds, oxazoline compounds,
And polyvalent metals. Compounds having two or more isocyanate groups include tolylene diisocyanate,
4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate,
Diisocyanate compounds such as 1,5-naphthalene diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate; Sumidule N (Sumidule is a registered trademark)
A bullet polyisocyanate compound such as (manufactured by Sumitomo Bayer Urethane Co., Ltd.); Desmodur IL, HL (Desmodur is a registered trademark) (Bayer G. (A.
G. FIG. )), Coronate EH (Coronate is a registered trademark)
Polyisocyanate compound having an isocyanurate ring such as (manufactured by Nippon Polyurethane Industry); Sumidur L
Adducts such as (Sumidule is a registered trademark) (Sumitomo Bayer Urethane Co., Ltd.), Coronate L (Coronate is a registered trademark) (Nippon Polyurethane Industry Co., Ltd.), Coronate HL (Coronate is a registered trademark) (Nippon Polyurethane Industry) Examples thereof include a polyisocyanate compound. Examples of the compound having two or more epoxy groups include polyglycidyl compounds such as trimethylolpropane triglycidyl ether and diglycidylamine, and bisphenol A / epichlorohydrin type epoxy resin. Specific examples of the melamine compound include a precondensate of melamine / formaldehyde resin and an alkyl ether thereof; specific examples of the guanamine compound include a precondensate of benzoguanamine, cyclohexanecarboguanamine, norbornanecarboguanamine and the like, and an alkyl ether thereof. Oxazoline-based compounds include isopropenyl oxazoline polymers and copolymers; and polyvalent metal compounds include aluminum trisacetylacetonate and zinc oxide. These crosslinking components can be used alone or in combination of two or more.

The amount of the crosslinking component capable of reacting with the water-absorbing polymer and the pressure-sensitive adhesive can be arbitrarily set depending on the type of the crosslinking component, the composition of the pressure-sensitive adhesive, the type of the water-absorbing polymer, and the like. 0.01 to 10 parts
It is preferably in the range of parts by weight, more preferably in the range of 0.1 to 5 parts by weight. If the amount of the crosslinking component is less than 0.01 parts by weight, the pressure-sensitive adhesive layer may creep, deteriorating the water-absorbing swelling characteristics of the water-absorbing composite, or failing to prevent cohesive failure of the pressure-sensitive adhesive layer. If the amount is more than 10 parts by weight, the adhesiveness between the pressure-sensitive adhesive layer and the adherend may decrease.

In the present invention, if necessary, a tackifier (rosin ester resin, phenol resin, xylene resin, xylene phenol resin, terpene phenol resin, petroleum resin, cumarone resin, low molecular weight styrene resin, terpene Resin, etc.), thickener (polyvinyl alcohol, sodium polyacrylate, carboxymethylcellulose, methylcellulose, etc.), pH adjuster (ammonia, amine, sodium hydroxide, potassium hydroxide, acetic acid, boric acid, phosphoric acid, etc.), coloring agent ( Pigments, dyes, etc.), plasticizers, softeners, antioxidants, fillers, viscosity modifiers and the like can be contained in appropriate amounts.

As a method for providing a pressure-sensitive adhesive layer on a water-absorbing composite having a water-absorbing polymer fixed to a substrate, a method in which a pressure-sensitive adhesive containing a cross-linking component is directly applied to one surface of the water-absorbing composite to remove the solvent. After applying a pressure-sensitive adhesive containing a cross-linking component to release paper and removing the solvent, a method of transferring the adhesive to one surface of the water-absorbing composite, laminating a double-sided tape impregnated with the pressure-sensitive adhesive on the release paper, Examples include a method of laminating a water-absorbing composite to which a water-absorbing polymer is fixed by polymerization. In this case, the pressure-sensitive adhesive layer may be provided on the entire surface of the water-absorbing composite to which the water-absorbing polymer is fixed, or may be discontinuous in various patterns such as stripes, polka dots, and grids as necessary. May be provided. When the pressure-sensitive adhesive layer is provided, for example, it is preferable that the pressure-sensitive adhesive layer does not excessively penetrate into the interior of the water-absorbing composite to which the water-absorbing polymer is fixed, and does not inhibit the water-absorbing properties of the water-absorbing polymer. .

The thickness of the pressure-sensitive adhesive layer is, for example, 1 to 200.
μm, preferably 10 to 100 μm. When the thickness is less than 1 μm, the adhesiveness and the adhesiveness are poor. Also 200
If the thickness is larger than μm, the water-absorbing sheet may have poor water-absorbing swelling properties. In the present invention, the pressure-sensitive adhesive layer contains a water-absorbing polymer and a cross-linking component capable of reacting with the pressure-sensitive adhesive (cross-linking effect). The effect that peeling does not occur between the polymer and the water-absorbing composite (water-absorbing polymer) is exhibited.

In the present invention, if necessary, a fungicide such as a benzimidazole compound may be added to a base material, a water-absorbing polymer,
It can be added to any part of the pressure-sensitive adhesive layer and can impart antifungal property. When removing the water leakage prevention material for a lining plate of the present invention from the lining plate, since the attached water leakage prevention material is in the form of a sheet or the like, it can be peeled continuously from the end thereof, which is extremely easy. Can be removed.

FIG. 3A shows a state in which the water leakage preventing material 4 for a lining plate of the present invention is applied between the lining plates 1. In the case where the water leakage prevention material is compressed as described above, FIG.
As shown in (b), the work is easy because the thickness is smaller than the gap 2 between the lining plates 1 during the work. Of course, when it comes into contact with water, the compressed state is released and the water absorbs and swells, so that the obstruction as shown in FIG. 3A is possible.

Also, the hanging holes of the lining plate are filled with the material for preventing water leakage of the lining plate of the present invention, covered, or attached to the surface of a plug that closes the holes, and the hanging holes are provided. Water leakage from the water can also be prevented. 4 (a) and 4 (b)
As shown in FIG. 4 (a), a lining plate 1 having an eaves-like shape 1a and a non-slip 5 provided on an edge of an upper surface is provided with a lining plate water leakage preventing material of the present invention as shown in FIG. By sticking from the back surface of the eaves 1a to the side surface of the lining plate, the possibility that the water leakage preventing material for the lining plate will fall off during use is further reduced. Furthermore, since rainwater does not flow directly into the gap between the side surfaces of the lining plate, water leakage prevention can be further improved.

[0056]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. In addition, the water absorption was measured by the following method. (Water absorption) A dried sample of the water-absorbing composite cut to 5 * 5 cm was placed in a 120 ml beaker containing 100 ml of ion-exchanged water and immersed for 1 hour. Thereafter, suction was performed on the filter paper for 20 seconds to remove excess water, and the sample weight was measured. The amount of water absorption was calculated according to the following equation.

Water absorption (g / m ² ) = (weight after water absorption−initial dry weight) / sample size (Production example of water-absorbing composite (1)) Part where 95 mol% was neutralized with sodium hydroxide 70 mol% of neutralized acrylic acid
And 30 mol% aqueous solution of acrylamide, 0.1 mol% of N, N'-methylenebisacrylamide (based on monomer)
And sodium persulfate 1.0 g / mol (based on monomer)
And 2,2′-azobis (N, N ′ dimethyleneisobutylamidine) dihydrochloride (0.5 g / mol (based on monomer)) were dissolved to prepare a 36% by weight aqueous monomer solution.

Next, a polyurethane sponge base material having a compression elasticity ratio of 10, a thickness of 5 mm, and a basis weight of 70 g / m ² was immersed in the monomer aqueous solution, and impregnated with the aqueous solution. And squeezed out. This impregnated material was sandwiched between two inert belts and subjected to radical polymerization by heating while being compressed on the substrate. The obtained water-absorbing composite (1) had a water-absorbing polymer of 130 g / m ² directly adhered to the substrate, and had a thickness of 2 mm.

When water was added to the water-absorbing composite (1), volume expansion was caused by water-absorbing swelling, and the thickness increased from 2 mm to 5 mm in one minute. Next, the volume-expanded water-absorbing composite (1) was placed in a dryer set at 120 ° C. and left for 1 hour. When the thickness after drying was measured, the thickness was 4.7 mm. The water-absorbing complex (1) is
The swelling form at the time of water absorption was almost retained after drying.

The water absorption of the water-absorbing composite (1) is 3000
g / m ² . (Production example of water-absorbing composite (2)) 70 mol% of partially neutralized acrylic acid in which 75 mol% is neutralized with sodium hydroxide
And 30 mol% aqueous solution of acrylamide, 0.5 mol% of N, N'-methylenebisacrylamide (based on monomer)
And sodium persulfate 1.0 g / mol (based on monomer)
And 2,2′-azobis (N, N ′ dimethyleneisobutylamidine) dihydrochloride (0.5 g / mol (based on monomer)) were dissolved to prepare a 36% by weight aqueous monomer solution. Next, a compression elasticity ratio of 2 and a thickness of 0.5 m
After immersing a polyester nonwoven fabric substrate having a weight of 25 g / m ² and impregnating the aqueous solution, excess monomer aqueous solution was squeezed out with a roller. The impregnated material was heated without compression to perform radical polymerization.

The water-absorbing composite (2) obtained was 60 g / m
^2, the water-absorbing polymer directly adheres to the substrate, and the thickness is 0.5
mm. When water was added to the water-absorbing composite (2), volume expansion slowly occurred due to water swelling, and the thickness increased from 0.5 mm to 5 mm after 30 minutes. Next, the volume-expanded water-absorbing composite (2) was placed in a dryer set at 120 ° C. and left for 1 hour. When measuring the thickness after drying, volume shrinkage occurs and the thickness is 0.5 mm
Had become smaller.

The water absorption of the water-absorbing composite (2) is 5000
g / m ² . (Production example of adhesive composition) Thermometer, cooling condenser,
In a 3 L flask equipped with a nitrogen inlet tube and a stirrer, 1500 parts by weight of toluene, 700 parts by weight of butyl acrylate,
5 parts by weight of hydroxyethyl acrylate, acrylic acid 2
-210 parts by weight of ethylhexyl, 35 parts by weight of acrylic acid, and 50 parts by weight of vinyl acetate were charged, and the temperature was raised to 80 ° C while stirring under a nitrogen stream. Next, after adding 2 parts by weight of benzoyl peroxide as a polymerization initiator, the mixture was stirred at the same temperature for 2 hours, and then 1 part by weight of benzoyl peroxide was added and further stirred for 2 hours. A polymer solution was obtained.

Then, 8 parts by weight of pentaline C as a tackifier was added to 100 parts by weight of the obtained copolymer solution.
(Pentaerythritol ester of polymerized rosin, softening point 123 ° C., manufactured by Rika Hercules Co., Ltd.) is added and dissolved, and 1 part by weight of Coronate L-55 is further used as a crosslinking component.
E (Coronate is a registered trademark) (a trifunctional isocyanate-based crosslinking agent manufactured by Nippon Polyurethane Industry Co., Ltd.) was added to obtain a pressure-sensitive adhesive composition having a nonvolatile content of 44.5% by weight. Example 1 (Preparation of Water Leak Prevention Material for Lining Board) The above-mentioned pressure-sensitive adhesive composition was applied to release paper so as to have a thickness of 70 μm after drying, dried, and the solvent was removed. To provide a pressure-sensitive adhesive layer, thereby preparing a water leakage preventing material (1) for a lining board of the present invention. (Construction on the lining plate) A water leakage preventing material (1) for a lining plate having a width of 100 mm was attached to the entire side surface of the lining plate having a size of 1 m * 2 m (a portion where a gap is generated when laying). This attaching work was very simple. (Water leak test) Two lining plates to which the water leakage prevention material (1) for lining plates was attached were laid on the ground, and the gap between the lining plates was 4 m.
m. 1 L of water was poured into this gap, but no water leaked below the lining plate.

Next, the gap between the lining plates was readjusted to 8 mm, and 1 L of water was poured. In this case, although a small amount of water leaked at the beginning, the gap was closed by rapid water absorption and swelling of the water leak prevention material (1), and the water leak was prevented. Next, when the gap was observed after being left to dry, the gap was closed. Further 1 L of water was poured into this gap, but no water leaked below the lining plate.

From the above, the water leakage preventing material for a lining plate of the present invention can prevent water leakage even if the space between the lining plates changes over time or even after drying. You can see that there is. (Removal of water-leak prevention material for lining plate) After the test, the water-leak prevention material for lining plate (1) was removed from the lining plate, but it can be easily peeled off in the form of a sheet. It was very simple compared to work. Comparative Example 1 Instead of the water-absorbing composite (1), the thickness was 5 mm, and the weight was 70.
A water leak test was performed in the same manner as in Example 1 except that a polyurethane sponge base material (g / m ² ) (water leak prevention material for comparative lining plate (1)) was used. One liter of water was poured into the gap between the lining plates, but most of the water leaked below the lining plates. Example 2 (Preparation of Water Leakage Prevention Material for Lining Board) An adhesive layer was provided on the water-absorbing composite (2) under the same conditions as in Example 1 to prepare a water leakage prevention material (2) for a lining plate of the present invention. did. (Construction on the lining plate) A water leakage preventing material (2) for a lining plate having a width of 100 mm was attached to the entire side surface of the lining plate having a size of 1 m * 2 m (a portion where a gap is generated at the time of laying). This attaching work was very simple. (Water leak test) Two lining boards to which the water leak prevention material for lining boards (2) was attached were laid on the ground, and the gap between the lining boards was 4 m.
m. One liter of water was slowly poured into the gap to swell the water leakage prevention material (2) to close the gap.
Thereafter, 1 L of water was poured into the gap, but no water leaked below the lining plate.

Next, the gap between the lining plates was readjusted to be 8 mm, and water was slowly poured into the gap to further swell the water leakage preventing material (2) for the lining plate to close the gap.
Thereafter, 1 L of water was poured into the gap, but no water leaked below the lining plate. Next, when the gap was observed after being left to dry, the gap was formed again. For this reason, it took time to pour water and swell the water leakage prevention material (2) for the lining plate to close the gap.
Even if water was poured into the gap, no water leaked below the lining plate. (Removal of water-leak prevention material for lining plate) After the test, the water-leak prevention material for lining plate (2) was removed from the lining plate, but it can be easily peeled off in the form of a sheet. It was very simple compared to work. Test Example 1 The water-leak prevention materials for lining boards (1) and (2) were applied to an iron plate and immersed in pure water for 7 days. ) And the pressure-sensitive adhesive layer did not peel off, and did not peel off even when pressed with a finger. There was no shedding of the water-absorbing polymer. Test Example 2 The same procedures as in Examples 1 and 2 (preparing a water leakage preventing material for lining boards) were conducted except that an adhesive composition to which coronate L-55E (Coronate was a registered trademark) was not added as a crosslinking component was used. Thus, water leakage prevention materials (2) and (3) for comparative lining boards were produced.

This comparative lining board water leakage preventing material (2) and
When (3) was applied to an iron plate and immersed in pure water for 7 days, the swelled water leakage prevention materials for comparative lining plate (2) and (3) were lightly pressed with a finger and the water-absorbing composite and adhesive layer And peeled off. Therefore, there was a concern that the water leakage prevention material for the comparative lining plate would fall off during use, making it difficult to use.

[0068]

The water leakage preventing material of the present invention is provided with a water-absorbing composite containing a water-absorbing polymer, so that water such as rainwater leaks from between the lining plates without hindering traffic of vehicles and people. Can be prevented. Further, it is possible to cope with a change in the space of the gap over time, and the workability such as construction is remarkably improved.

In the case of the compressed water-absorbing composite, since the thickness is thin, storage and transportation are easy, and handling work at the time of construction is simplified. In addition, the density of the water-absorbing composite obtained by compression increases, and "strain" appears in the texture, so that the work of attaching, cutting, and the like is further facilitated. Furthermore, when a base material having a high compression-restoring elasticity such as a sponge is used, once it has absorbed water and swelled, it retains its expanded form. , The gap can be closed for a long time. Therefore, extremely high water stoppage and water leakage prevention are exhibited. In addition, due to the restoring elastic force of the base material and the water-absorbing swelling property of the water-absorbing polymer, it exhibits extremely high volume expansion as well as rapid water absorption.

The water-leak prevention material for a lining plate having an adhesive layer provided on one side of the water-absorbing composite can be constructed and installed on the lining plate before laying, which is extremely advantageous in terms of workability. preferable. Furthermore, the water-leak prevention material for a lining board provided with an adhesive layer containing a crosslinking component capable of reacting with the water-absorbing polymer and the adhesive on at least one surface of the water-absorbing composite to which the water-absorbing polymer is fixed has a crosslinking effect. The interface between the water-absorbing composite and the pressure-sensitive adhesive layer is firmly bonded, so that even when the water-absorbing swells, the pressure-sensitive adhesive layer and the water-absorbing composite (water-absorbing polymer) do not peel off and cover for a long time. It can be interposed in the gap between the work plates, and exhibits a long-term water leakage prevention effect.

[Brief description of the drawings]

FIG. 1 is a top view of a state in which lining plates are arranged.

FIG. 2 is a sectional view taken along line A-A 'of FIG.

FIG. 3 (a) is a view showing a state in which a water leakage preventing material for a lining plate of the present invention is applied between lining plates. (B) It is a figure which shows the state at the time of constructing between lining boards when the water leakage prevention material for lining boards of this invention is compressed.

FIG. 4A is a view showing a lining plate provided with an eave and a non-slip. (B) It is sectional drawing which shows the lining board in which the eaves and the non-slip were provided. (C) It is a figure which shows the state which attached the water leakage prevention material for lining boards of this invention from the back surface of the eaves of the lining board provided with the eaves and the non-slip.

[Explanation of symbols]

 Reference Signs List 1 lining plate 1a eaves of lining plate 2 gap 2a gap without receiving girder below 2b gap with receiving girder below 3 receiving girder 4 water leakage prevention material for lining plate

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihiko Masuda 5-8 Nishiburi-cho, Suita-shi, Osaka Nippon Shokubai Co., Ltd. (72) Inventor Masao Shigeru 2-12-11 Shimbashi, Minato-ku, Tokyo Kawasho Jecos (72) Inventor Akio Suzuki 2-12-11 Shimbashi, Minato-ku, Tokyo Kawasho Jecos Co., Ltd.

Claims (3)

[Claims] 1. A water leakage prevention material for a lining board, comprising a water-absorbing composite containing at least a water-absorbing polymer. 2. The material according to claim 1, wherein the water-absorbing composite is obtained by polymerizing a water-soluble unsaturated monomer on a substrate. 3. The material according to claim 2, wherein the substrate is a sponge substrate.