JPH049827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a water-stopping material and a water-stopping method. Specifically, at least one side of a support containing a water-absorbing resin is provided with an adhesive composition comprising an adhesive resin and a water-absorbing resin.
Water-stopping material that can be suitably used to stop rain gear and other articles used for waterproofing purposes, and a water-stopping method that can effectively stop water when sewing waterproof sheet-like articles by using the water-stopping material Regarding.

[Prior art] Conventionally, tents, rain gear, and other items used for waterproofing purposes are often made by processing waterproof sheets, but in this case, there are no connections between the sheets or fixing them to supports, etc. is essential. For such joining and fixing, it is widely practiced to partially overlap two waterproof sheets and join the overlapped parts using adhesive, heat fusion, or sewing using a sewing machine. It is being said.

[Problems to be Solved by the Present Invention] However, among the above-described bonding methods, the use of adhesives has poor work efficiency and may not provide a sufficiently strong bond. Depending on the structure of the tarpaulin sheet itself, the heat fusion method may not be able to properly join the sheets, and it is often impossible to perform this work at the site where the tent or the like is installed.

On the other hand, although the method of sewing using a sewing machine or the like is not as efficient as the method of heat fusion, it is the simplest and most reliable method when the number of joints is small. However, there is a fatal flaw in that water leaks from the numerous seams created by sewing with needles.

[Means for Solving the Problems] The present inventors have overcome the above-mentioned fatal defects that occur when sewing waterproof sheet-like articles, and have also developed a method for use in various other applications aimed at stopping water. The present invention was completed as a result of intensive research to find available water-stopping materials and methods for effectively stopping water using the water-stopping materials.

That is, the present invention sews a water-stopping material and a waterproof sheet-like article comprising an adhesive composition comprising an adhesive resin and a water-absorbing resin on at least one side of a support containing a water-absorbing resin. Regarding the water-stopping method, which is characterized by attaching the water-stopping material to the seam before sewing, even if water enters the seam, the water-absorbing resin existing in the middle of the seam absorbs the water. By swelling, the water intrusion path is quickly closed, the waterproof ability of the seamed portion can be maintained, and it can also be used for various other applications aimed at stopping water.

Incidentally, the term "stitching section" as used in the present invention means a section where two sheet-like articles are overlapped in order to be sewn together.

The water absorbent resin used in the present invention includes:
For example, polyacrylic acid-based water-absorbing resins such as cross-linked polyacrylic acid and its salts, acrylic acid-vinyl alcohol copolymers and their salts, starch
Acrylic acid graft copolymer and its salt, starch-acrylonitrile graft copolymer hydrolyzate, polyacrylamide crosslinked product, sulfonic acid group-containing crosslinked polymer and its salt, isobutylene-
Examples include water-swellable polymers such as maleic acid copolymers and their salts, cross-linked polyethylene oxide, etc. One or more of these can be used, but the water swelling ratio of these is 30 times or more by volume. It is preferable to have, more preferably
It is more than 100 times.

Among these water-absorbing resins, polyacrylic acid-based water-absorbing resins are preferred in order to quickly absorb water and swell greatly upon contact with water, thereby exhibiting a more sufficient water-stopping effect.

The adhesive resin used in the present invention includes:
Any conventionally known materials can be used as long as they are sticky and insoluble at least at room temperature.
Examples include those commonly used as adhesives such as acrylic ester (co)polymers, natural rubber, various synthetic rubbers, urethane, and silicones, and one or more of these can be used as is, or if necessary, cross-linked. It can be used in the form of additives such as additives, plasticizers, tackifiers, antioxidants, colorants, and others. Among these adhesive resins, it is preferable to use acrylic acid ester (co)polymers, which are excellent in various properties such as adhesiveness and have excellent weather resistance.

The adhesive compositions used in the present invention each contain the water-absorbing resin and the adhesive resin described above, and the method for obtaining the adhesive compositions is not particularly limited, and various methods may be used. For example, a powder or granular water-absorbing resin is dispersed as it is or in an organic solvent in a solvent-free liquid adhesive resin that can be crosslinked by a known method such as an organic solvent solution, hot melting, or active energy rays. After mixing in this form, the organic solvent can be removed, the adhesive resin can be crosslinked, etc., as desired.

In the water-stopping material of the present invention, the water-stopping effect due to water absorption is also expressed by the water-absorbing resin contained in the support. It can be set to the minimum amount to control the development rate to a desired degree, and is preferably 1 to 50 parts by weight, more preferably 3 to 30 parts by weight, based on 100 parts by weight of the adhesive composition. is suitable.

The material that can be used as a support in the present invention is not particularly limited as long as it can hold the powder or granular water-absorbing resin without hindering its swelling due to water absorption and without reducing its strength as a support. First, for example, soft thermoplastic plastics, rubbers, etc. can be used, and particularly preferred are plasticized polyvinyl chloride, soft polyurethane, and natural or various synthetic rubbers.

A method for incorporating the water-absorbing resin into the support is, for example, by thermally melting the above-mentioned material used for the support or making it into a solution in an organic solvent, and then adding the powder or granular water-absorbing resin to this as it is or dispersing it in the organic solvent. After the blended mixture is made into a tape or sheet form by a conventionally known method such as a calendering method, a casting method, an extrusion method, etc., the organic solvent and the like may be removed by drying, if necessary. The amount of water absorbent resin contained in the support is 5 to 70% by weight, preferably 20 to 70% by weight based on the total amount of the water absorbent resin and support.
50% by weight. If it is less than 50% by weight, the water-stopping effect due to swelling when water enters is not sufficient, and
If it exceeds 70% by weight, the strength as a support will decrease. The thickness of the tape or sheet-like support containing the water-absorbing resin can be appropriately selected depending on the intended use, but it is usually preferably in the range of 30 to 1000 microns.

As a method for providing the above-mentioned support containing a water-absorbing resin with the above-mentioned adhesive composition containing an adhesive resin and a water-absorbing resin, for example, the above-mentioned support in the form of a tape or sheet in advance may be provided with:
After applying the adhesive composition, if desired, remove the organic solvent contained in the adhesive composition or crosslink the adhesive resin, or apply the adhesive composition in advance on release paper, etc. What is necessary is just to transfer what was made into a tape or sheet form to the said support body.

In the water-stopping method of the present invention, when sewing waterproof sheet-like articles, a tape or a sheet-like material containing the water-absorbing resin described above is applied in advance to the seamed part, that is, the part where two sheet-like articles are overlapped. This is achieved by attaching a water stop material comprising an adhesive composition containing an adhesive resin and a water-absorbing resin to at least one side of the support and then sewing it. It is preferable that the water-stopping material used in this case is a water-stopping material in which the adhesive composition is provided on both sides of the support because a temporary fixing effect can be obtained during sewing.

The sheet-like article with the waterproof material pasted on the seam portions in advance may be sewn using a sewing machine or the like in the same manner as in the past.

[Effects of the Invention] The water-stopping material of the present invention has an adhesive composition containing an adhesive resin and a water-absorbing resin on at least one side of a support containing a water-absorbing resin. It has a high level of waterproofness and water-stopping effect due to water absorption, and the water-stopping effect appears quickly. For example, when simply applying a mixture of a water-absorbing resin and an adhesive resin to at least one side of a support that does not contain a water-absorbing resin, if emphasis is placed on improving the water-stopping property by increasing the amount of the water-absorbing resin, the adhesiveness will be impaired. However, if emphasis is placed on adhesion, the opposite result will occur. The water-stopping material of the present invention has no such problems at all, and the adhesiveness, water-stopping properties, and rate of development of the water-stopping effect can be arbitrarily adjusted to desired levels.

Therefore, since it can be easily attached to waterproof sheet-like articles and exhibits a remarkable water-stopping effect, it can be suitably used for fixing pinholes and tears in waterproof tents, rain gear, clothing, etc. I can do it. In addition, the water-stopping material of the present invention can be applied to gaskets used at the joints of water faucets and water pipes, or the water-stopping material of the present invention can be used as a gasket to further perfect the function of gaskets that require a water-stopping effect. You can also do that.
Further, among the waterproof materials of the present invention, those having adhesive resin on both sides can be used by pasting a sheet-like article such as fiber, paper, or plastic on one side.
By using it as a covering material for electric wires and cables, etc.
It can also prevent water from entering the interior.

In addition, the waterproof sheet-like article sewn by applying the water-stopping method of the present invention has a large number of needle-through holes, that is, many seams, in the seam part, similar to the sheet-like article sewn by the conventional method. However, when using sheet-like articles obtained by sewing, such as tents and rain gear, these have water absorbency that exists in the middle of the seams even if water enters the seams due to rain etc. When the resin absorbs water and swells, the water intrusion path is quickly closed, a water-stopping effect is achieved, and the waterproof performance of the seamed portion can be maintained.

Therefore, by implementing the water-stopping method of the present invention, it is possible to easily and reliably sew waterproof sheet-like articles by sewing with a sewing machine, etc., without causing any water leakage from the seams, which has hitherto been fatal. It can be carried out.

Further, during such sewing, a temporary fixing effect can be obtained by pasting the waterproof material of the present invention on the seamed portion in advance, so that the sewing work can be performed easily and efficiently.

[Examples] The present invention will be explained in more detail below with reference to Examples, but the content of the present invention is not limited thereby. In addition, parts and percentages in the examples are by weight unless otherwise specified.

Example 1 Plasticized polyvinyl chloride containing 40% plasticizer
To 100 parts, 80 parts of a powdered polyacrylic acid-based water-absorbing resin (Aquarik CA-ML, manufactured by Nippon Shokubai Chemical Co., Ltd.) with a particle size of approximately 30 μm was added and kneaded, and then extrusion molded. A support containing a water-absorbing resin having a thickness of 200 μm was obtained. Separately, apply a particle size of about 30μ to 100 parts of a 40% organic solvent solution (Aroset 8025, manufactured by Nippon Shokubai Chemical Co., Ltd.) of an adhesive resin made of an acrylic acid alkyl ester copolymer on a release paper. Polyacrylic acid-based powder water absorbent resin (Aquarik CA manufactured by Nippon Shokubai Chemical Co., Ltd.)
-ML) and 1.0 part of a crosslinking agent (Coronate L-55E manufactured by Nippon Polyurethane Industries Co., Ltd.) was applied and dried to a dry thickness of 50 μm. Transfer the water-absorbing resin obtained by the above procedure onto one side of the support,
A single-sided adhesive water stop material 1 with a thickness of 250 μm was obtained.

Water stop material 1 obtained in the above procedure was attached to both sides of the rubber gasket of a water faucet that leaks due to aging, and when this was reattached to the faucet, water leakage was prevented.

Comparative Example 1 Comparative material 1 was obtained by repeating the same operations as in Example 1, except that the polyacrylic acid-based powdery water-absorbing resin was not used. The obtained Comparative Material 1 was used in an aged rubber gasket in the same manner as Waterstop Material 1 in Example 1, but water leakage could not be completely prevented.

Example 2 Plasticized polyvinyl chloride containing 40% plasticizer
To 100 parts, 80 parts of a powdered polyacrylic acid-based water-absorbing resin (Aquarik CA-ML, manufactured by Nippon Shokubai Chemical Co., Ltd.) with a particle size of approximately 30 μm was added and kneaded, and then extrusion molded. A support containing a water-absorbing resin having a thickness of 200 μm was obtained. Separately, apply a particle size of about 30μ to 100 parts of a 40% organic solvent solution (Aroset 8025, manufactured by Nippon Shokubai Chemical Co., Ltd.) of an adhesive resin made of an acrylic acid alkyl ester copolymer on a release paper. Polyacrylic acid-based powder water absorbent resin (Aquarik CA manufactured by Nippon Shokubai Chemical Co., Ltd.)
-ML) and 1.0 part of a crosslinking agent (Coronate L-55E manufactured by Nippon Polyurethane Industries Co., Ltd.) was applied and dried to a dry thickness of 50 μm. Transferring the water-absorbing resin obtained by the above procedure onto both sides of the support,
A double-sided adhesive water stop material 2 with a thickness of 300 μm was obtained.

When sewing a polyvinyl chloride waterproof sheet for making a tent, overlap the 5 cm wide seam parts from the ends of the two polyvinyl chloride sheets and sandwich the waterproof material 2 obtained above between them. After pasting it and temporarily fixing it, I sewed it together using a sewing machine. The tent obtained by repeating this operation had seams in a part of the ceiling, but there was no water leakage even during rain.

Comparative Example 2 Comparative material 2 was obtained by repeating the same operations as in Example 2, except that the polyacrylic acid-based water-absorbing resin was not used. A tent was produced in the same manner using Comparative Material 2 in place of Waterstop Material 2 in Example 2, but water leaked during rain.

Claims (1)

[Scope of Claims] 1. A water-stopping material comprising an adhesive composition comprising an adhesive resin and a water-absorbing property on at least one side of a support containing a water-absorbing resin. 2. When sewing a waterproof sheet-like article, a stopper made of a support material containing a water-absorbing resin and an adhesive composition containing an adhesive resin and a water-absorbing resin provided on at least one side of the support body to be sewn in advance is used. A water-stopping method for a waterproof sheet-like article, characterized in that a waterproof material is attached and then sewn.