JP3673036B2 - Method for producing water-stopping material - Google Patents

Description

【００２８】
なお表中、良好は２４時間経過以上漏水なし、不良は２４時間経過未満に漏水ありを意味する。また参考例は、比較例１の止水材に折り曲げ処理を加えないで適用した場合である。表より、実施例では折り曲げによる異常変形を発生せず、易水溶層がその機能を良好に維持して水シール性を低下しないことがわかる。
【図面の簡単な説明】
【図１】止水材例の断面図
【図２】他の止水材例の断面図
【符号の説明】
１：易水溶層
２：発泡体層
３：粘着層
４：滑膜コート[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a water-stopping material that is excellent in mountability between members and sealing performance, and that is less likely to cause wrinkles suitable for a water seal of a building.
[0002]
BACKGROUND OF THE INVENTION
The group to which the inventors belong has the foam layer 2 and the easily water-soluble layer 1 as illustrated in FIG. 1 and FIG. 2, and is attached between members for buildings and water-sealed. A water-stopping material was proposed (Japanese Patent Application Nos. 8-149932 and 8-244113). This prevents adhesion to the member and generation of large frictional force with the member through the easily water-soluble layer, and allows the member to be easily aligned without misplacement such as twisting or misalignment of the water-stopping material. The easily water-soluble layer absorbs intrusion water and quickly becomes thickened, and adheres without gaps, regardless of the smoothness or rough surface of the mating member, and exhibits a water-stopping effect. Can be water-sealed with high reliability.
[0003]
Therefore, according to the above-mentioned water-stopping material, the lack of water-sealing force on the foam-side that comes into contact with the member via the compression repulsion force due to the water-stopping material that has only been provided with the adhesive layer on one side of the foam until then is overcome. be able to. In addition, when the other member is aligned with one member by the water-stopping material provided with the adhesive layer on both sides of the foam, the adhesive layer adheres to the other member before the work is completed, and when it is peeled off It is also possible to overcome the problem of work mistakes in which the water-stopping material is peeled off from one member and is misaligned, or the water-stopping material is twisted in alignment with adhesion.
[0004]
Furthermore, due to the water-stopping material temporarily attached to the adhesive layer attached to both sides of the foam, twisting of the water-stopping material when the separator is peeled and removed after alignment of the member, misalignment due to peeling from the base material, etc. The problem of lowering the reliability of the water seal due to the occurrence of water can also be overcome.
[0005]
[Technical Problem of the Invention]
It is an object of the present invention to develop a method for producing a water-stopping material that is less likely to be wrinkled by an external force such as bending in the water-stopping material having at least a foam layer and an easily water-soluble layer, and that is more reliable in water seal processing. To do. In the water-stopping material having wrinkles, the wrinkle portion may allow water to be immersed particularly in the initial stage.
[0006]
[Means for solving problems]
The present invention is characterized in that at least a foam layer and an easily water-soluble layer are provided by subjecting the easily water-soluble layer attached to the foam layer by a film laminating method or a melt extrusion method to a liquefaction treatment in advance. A method for producing a waterstop material is provided.
[0007]
【The invention's effect】
According to the present invention, a water-stopping material having excellent adhesion to the foam layer can be obtained by liquefaction treatment of the easily water-soluble layer, and the easily water-soluble layer after the treatment functions as a wrinkle-preventing layer. It is possible to prevent the occurrence of folding wrinkles and the like when an external force such as bending is applied based on the difference in elasticity between the water-soluble layer and the foam layer. Therefore, while maintaining the above-described features of the water-stopping material according to the present invention, a water seal with higher reliability can be achieved, and a water seal with higher reliability even in a method of press-fitting between the existing members. Can be achieved.
[0008]
In the above, if the generated wrinkles are large and do not sufficiently recover and are mounted between the members in the presence of wrinkles, even if there is no delay in the absorption of intrusion water by the water-soluble layer, There is a case where the effect is delayed and water is submerged through the gap, and the response speed of the water stop effect is likely to decrease particularly when the first intrusion water is present. Therefore, the prevention of wrinkle generation due to good adhesion between the water-soluble layer and the foam layer can prevent the delay of the water-stopping effect.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the production method of the present invention, in a water-stopping material having at least a foam layer and an easily water-soluble layer, the easily water-soluble layer attached to the foam layer by a film laminating method or a melt extrusion method is subjected to liquefaction treatment in advance. You get what you've processed. Examples of the water stop material are shown in FIGS. 1 is an easily water-soluble layer, 2 is a foam layer, 3 is an adhesive layer, 4 is a synovial membrane coat, and 5 is a separator. FIG. 1 illustrates a type composed of two layers, a foam layer and an easily water-soluble layer. In FIG. 2, in addition to the foam layer 2 and the easily water-soluble layer 1, an adhesive layer 3, a synovial coat 4 and a separator 5 are provided. The type which has is illustrated.
[0010]
The water-stopping material according to the present invention has at least a foam layer and an easily water-soluble layer, and the easily water-soluble layer is attached to the foam layer by a film laminating method or a melt extrusion method, followed by a liquefaction treatment in advance. If it was done. The easily water-soluble layer or a synovial film coating provided on the outer surface or an adhesive layer provided as necessary between the outer surface or the easily water-soluble layer and the foam layer is provided on one or both surfaces of the foam layer. The form of the water-stopping material can be determined as appropriate according to the place of application and the surface condition of the member, and is similar to the conventional one except that the easily water-soluble layer is disposed at the water-stop target place. can do.
[0011]
Therefore, a suitable material can be used for forming the foam layer. By the way, as the foam layer, for example, polyolefin foam or urethane foam made of ethylene / propylene copolymer or ethylene / propylene / diene copolymer (EPDM), silicone foam or acrylic foam, butyl rubber foam or SBR. Examples thereof include those made of a polyurethane foam, an NR foam, an NBR foam, and a blend foam of these polymers. In particular, a foam made of EPDM foam can be preferably used from the viewpoint of water resistance and light weight.
[0012]
The thickness of the foam layer can be appropriately determined according to the application location of the water-stopping material, the compressibility by the expansion ratio, and the like. Generally, a thickness of 100 mm or less, especially 0.1 to 50 mm, especially 1 to 30 mm is used. The expansion ratio is generally 2 to 100 times, especially 3 to 50 times, particularly 5 to 30 times. The foam layer may have either a closed cell structure or an open cell structure, but a closed cell structure is preferred from the viewpoint of water sealing. In the case of an open-cell structure, it is necessary to compress and arrange in a water-blocking state.
[0013]
The easily water-soluble layer may be formed of an appropriate material that easily dissolves in water, such as polyvinyl alcohol, carboxymethyl cellulose, polyethylene glycol, etc., depending on the response speed to water according to the intended use of the water-stopping effect. it can. Therefore, in the case of polyvinyl alcohol, it is not necessary to have a high saponification degree, and those having a low saponification degree of about 50 to 70% can be used.
[0014]
To attach a readily water layer to the foam layer may row Ukoto a laminate method or melt extrusion method off Irumu. The thickness of the easily water-soluble layer can be appropriately determined according to the dissolution rate in water and the like, but is generally 500 μm or less, especially 5 to 200 μm, particularly 10 to 100 μm.
[0015]
Adhesion treatment of the easily water-soluble layer attached to the foam layer is performed through liquefaction treatment. The liquefaction treatment is appropriately performed by, for example, a solution treatment method using a solvent, a heat treatment method using heat, or a combination method thereof. Can be done in a simple manner. As the solvent for the dissolution treatment method, an appropriate one can be used, but in general, water can be preferably used. The melt treatment method is particularly effective when the melting point of the easily water-soluble layer is a low temperature of about 50 to 100 ° C., and the temperature is higher than the melting point and the treatment time does not impair the characteristics of other constituent layers such as the foam layer. Preferably it is done.
[0016]
Due to the liquefaction treatment of the easily water-soluble layer attached to the foam layer, the foam layer and the easily water-soluble layer are not easily peeled off by an external force such as bending due to the formation of a fine concavo-convex structure adapted to the foam layer. In addition, a structure in which wrinkles are not easily generated can be obtained. The liquefaction treatment can be performed at an appropriate stage after the easily water-soluble layer is attached to the foam layer, and can be performed at any stage before or after the attachment of the layer provided as necessary, such as an adhesive layer. Can do.
[0017]
The pressure-sensitive adhesive layer provided as necessary can be formed of an appropriate water-resistant pressure-sensitive adhesive material, and any of known water-resistant pressure-sensitive adhesives such as rubber, acrylic and silicone can be used. In particular, a butyl rubber-based pressure-sensitive adhesive can be preferably used from the viewpoint of water sealability. The thickness of the adhesive layer can be appropriately determined according to the application location of the water-stopping material such as the surface roughness of the member, and is generally 5 mm or less, especially 0.1 to 3 mm, especially 0.2 to 2 mm. The
[0018]
The adhesive layer may be formed by an appropriate method such as a coating method, an extrusion method, or a calendar method. Moreover, it can laminate on a foam layer etc. by appropriate systems, such as a direct shaping | molding system on a foam layer, and the adhesion system of a sheet-like adhesion layer. In that case, you may form an adhesion layer using a double-sided adhesive sheet. The adhesive surface of the foam layer with the pressure-sensitive adhesive layer can be subjected to appropriate adhesive strength improving treatment such as corona discharge treatment or flame exposure. As illustrated in FIG. 2, the surface of the pressure-sensitive adhesive layer 3 is protected by temporarily attaching a separator 5 or the like as necessary until it is put to practical use. Similarly to the foam layer, an appropriate additive such as an anti-aging agent or a filler can be blended in the adhesive layer as necessary.
[0019]
On the other hand, if necessary, a synovial membrane coat 4 can be provided on the outer surface of the water-soluble layer as shown in FIG. The purpose of the synovial membrane coating is to reduce the contact resistance between the easily water-soluble layer and the member to make it slippery and to improve workability. For the formation of the synovial membrane coat, for example, an appropriate release agent such as a long-chain alkyl group, a silicone group, or a fluorine group is used. In the case of a synovial film made of a release agent, when having an adhesive layer with an adhesive surface exposed on the opposite side of the foam layer, it can be wound into a roll using the releasability of the synovial film, It is possible to overlap and avoid the need to temporarily cover the exposed adhesive surface with a separator in order to facilitate rewinding and the like.
[0020]
The formation of the synovial film can be performed by an appropriate method such as a method of applying a forming material on the easily water-soluble layer, such as a method of laminating on the adhesive layer as an easily water-soluble film provided with the synovial film. However, a water stop material can be formed. The thickness of the synovial membrane coat is generally 100 μm or less, and in particular, 1 to 50 μm, but may be appropriately determined within a range that does not inhibit the water solubility of the easily water-soluble layer.
[0021]
The water-stopping material according to the method of the present invention should be used in an appropriate form such as a sheet intended to adhere to the entire surface of the application site or a tape having a predetermined width intended to partially adhere to the application site. Can do. In addition, the water-stopping material can be easily disposed between appropriate members to easily form a water-stopping structure with excellent water seal reliability. There is no particular limitation between the members to be applied, for example, between building members and between opening forming materials at openings such as ventilation openings and attachment members to the same, or between roof plates and roof tiles (roof base materials) It can be preferably used in appropriate places where water seal processing is required, such as between sashes and doors and their frames, kitchen utensils such as sinks in the room, bathroom vanity, and sanitary items such as bathtubs and their supporting members. .
[0022]
【Example】
Example 1
Polyethylene glycol (melting point: 60 ° C.) is melt-extruded on one side of a 10 mm thick foam layer made of an EPDM foam sheet to form a 0.03 mm thick easily water-soluble layer, and then the other side of the foam layer is thick. After providing a 0.3 mm thick acrylic adhesive layer and a separator to obtain a sheet, water is uniformly sprayed onto the easily water-soluble layer at a rate of 100 g / m ² and then liquefied, followed by drying. A waterstop material was obtained.
[0023]
Example 2
A water-stopping material was obtained in the same manner as in Example 1, except that the water-soluble layer was liquefied by placing it in an oven at 75 ° C. for 10 minutes after the formation of the water-soluble layer, and then attaching an adhesive layer and the like.
[0024]
Comparative Example 1
A waterstop material was obtained according to Example 1 except that the water-soluble layer was not liquefied.
[0025]
Comparative Example 2
A waterstop material was obtained according to Example 2 except that the water-soluble layer was not liquefied.
[0026]
After applying the bending treatment 5 times to the water-stopping material obtained in the evaluation test example and the comparative example, the whole surface is adhered to the veneer plate through the adhesive layer, and the outer wall panel is placed on the veneer plate so that the foam layer is predetermined. The water sealability at 50 mm hydrostatic pressure of the screw stopper when the compression rate of the foam layer was changed variously was examined by screwing so as to obtain a compression rate.
[0027]
The results are shown in the following table.

[0028]
In the table, “good” means no leakage after 24 hours, and “bad” means that there is leakage after less than 24 hours. Moreover, a reference example is a case where it applies without adding a bending process to the water stop material of the comparative example 1. FIG. From the table, it can be seen that in the examples, abnormal deformation due to bending does not occur, and the easily water-soluble layer maintains its function well and does not deteriorate the water sealing property.
[Brief description of the drawings]
[Fig. 1] Cross-sectional view of a water-stopping material example [Fig. 2] Cross-sectional view of another water-stopping material example [Explanation of symbols]
1: Easily water-soluble layer 2: Foam layer 3: Adhesive layer 4: Synovial coat

Claims (2)

A stop layer comprising at least a foam layer and an easily water-soluble layer, wherein the easily water-soluble layer attached to the foam layer by a film laminating method or a melt extrusion method is subjected to a liquefaction treatment in advance. Manufacturing method of water material. The manufacturing method according to claim 1, wherein the easily water-soluble layer is liquefied by a dissolution treatment method using a solvent or a melting treatment method using heat, and the water-stopping material has an adhesive layer.

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