JP2005194773A - Waterproof coated film structure and water system coated film waterproofing material substrate buffer sheet used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a water system coated film waterproofing system capable of lightening load to the environment in various points, being efficiently dried, having no possibility to produce any split resulting from drying, also following variations in deformation of a substrate to prevent the swell phenomenon by moisture evaporation from the substrate and efficiently forming the uniform thickness of a coated film. <P>SOLUTION: A coated film waterproof structure forming a waterproofing membrane of the water system coated film waterproofing material on the substrate is constituted by having the substrate, a water system coated film waterproofing material substrate butter sheet stretching out on the substrate by either joint means such as an adhesive and a cohesive agent or a screw to promote the uniform moisture evaporation and preventing the occurrence of the split resulting from drying contraction of the water system coated film waterproofing material and the water system coated film waterproofing material infiltrated into the water system coated film waterproofing material substrate buffer sheet to apply, and the water system coated film waterproofing material substrate buffer sheet promotes the uniform moisture evaporation to include the surface material preventing the occurrence of the split resulting from the drying contraction of the water system coated film waterproofing material and an infiltration preventive means to the substrate of the waterproofing material stretched to the lower surface of the surface material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a waterproof coating structure using a waterproof waterproof coating material on a roof or other waterproof portion of a building, and a base buffer sheet for waterproof waterproofing film as a film-forming auxiliary means used in this construction.

  In recent years, as a waterproofing method for rooftops of buildings such as apartment buildings, balconies, etc., a coating film waterproofing method using a polyurethane resin waterproofing material or the like has been widely adopted. This coating waterproofing method applies resin directly to the construction site, so it is easier to apply a waterproof coating regardless of the shape of the construction site than the sheet-based waterproofing method using a molded sheet such as a vinyl chloride resin waterproof sheet. There is an advantage that can be formed.

  Conventional coating waterproofing methods can be broadly divided into coating methods (coating materials such as urethane rubber, rubber asphalt, FRP, acrylic rubber, chloroprene rubber) and spraying methods (super fast curing urethane rubber as coating material). In recent years, low-solvent, solvent-free types have reduced environmental impact as part of countermeasures against problems such as organic solvent poisoning and adverse effects on the working environment caused by solvent odors. Coating film waterproofing materials and water-based coating film waterproofing materials, for example, acrylic rubber emulsion type waterproofing materials, have been developed and are beginning to spread for reasons such as easy handling and reduced environmental burden.

However, the following disadvantages are unavoidable in the conventional water-based coating waterproofing method.
A. Since it is necessary to evaporate water during the film formation process, it takes time for evaporation and film formation by natural drying.
B. The thickness after film formation in which moisture evaporates is not only less than that at the time of coating, but also becomes non-uniform, and it is difficult to ensure a predetermined thickness. If the coating amount is increased to avoid this, cracks due to drying shrinkage are likely to occur.
C. In the conventional water-based coating film waterproofing method, the waterproof layer is formed following the shape of the base surface, so that, for example, irregularities on the base surface appear on the waterproof layer as they are.
D. Further, in the conventional construction method, the concrete base surface and the waterproof layer are firmly bonded to each other and deformed following the fluctuation of the concrete base surface, and the waterproof layer may be broken due to generation of cracks in the base surface.
E. In addition, there is a method of blending cement and reacting with moisture for the purpose of avoiding the above inconvenience as much as possible. However, when thick coating is applied, cracks occur in the drying and curing process. Moreover, in the construction method in which such a waterproof material is cured by reaction with other components, it is necessary to perform stirring and mixing at the construction site, which not only affects construction efficiency but also makes it difficult to avoid construction mistakes.
F. The construction by the spraying method has the advantage that these disadvantages are unlikely to occur, but a dedicated spraying tool is required for forming the waterproof layer, and handling thereof requires considerable skill.

Various techniques have been provided to solve the above-mentioned problems, but nothing has yet been completed. Related patent documents include the following.
JP 2001-303723 A JP 2001-342720 A Japanese Patent Laid-Open No. 7-292676

  The problem to be solved by the present invention is that there is little load on the environment at various points, there is no risk of cracking due to drying despite the fact that drying in a short time can be realized, and it follows the deformation variation of the groundwork This is the realization of a water-based waterproofing system that can efficiently form a uniform coating thickness while avoiding the bulge phenomenon caused by water evaporation from the substrate.

  The present invention relates to a waterproof coating structure in which a waterproof layer is formed by a water-based waterproof coating material on a base, and the water is stretched on the base by a bonding means such as an adhesive, an adhesive, or a screw. A base buffer sheet for water-based coating waterproofing material that promotes uniform transpiration and prevents cracks due to drying shrinkage of the water-based coating waterproofing material, and a water-based coating impregnated in the base buffer sheet for water-based coating waterproofing material An object of the present invention is to solve the above-mentioned conventional problems by providing a waterproof coating structure comprising a waterproof membrane.

In the waterproof coating structure, the base cushion sheet for the water-based coating waterproof material promotes uniform moisture transpiration and prevents the water-based coating waterproof material from cracking due to drying shrinkage. And a film for preventing permeation of the waterproof material into the base.

In the waterproof coating structure, the surface material is composed of a synthetic fiber nonwoven fabric, and a mesh sheet and / or a glass fiber nonwoven fabric is interposed between the nonwoven fabric and the film stretched on the bottom surface. There is. The purpose of these interposing materials is to ensure the dimensional stability of the base buffer sheet for water-based coating film waterproofing materials and the ease of handling by improving the rigidity.

Furthermore, in any one of the above-described waterproof coating structures, the adhesive or pressure-sensitive adhesive material as the joining means is scattered on the base to form an air passage between the base cushion sheet for water-based paint waterproofing material and the base. It may happen. The main types of pressure-sensitive adhesives include natural rubber-based pressure-sensitive adhesives, styrene / butadiene rubber-based, butyl rubber-based, recycled rubber-based and other synthetic rubber-based pressure-sensitive adhesives, and acrylic pressure-sensitive adhesives. An asphalt pressure-sensitive adhesive obtained by adding a petroleum-based tackifier resin to the water has good water-resistant adhesion and is suitable for use.

Furthermore, in any one of the above-described waterproof coating film structures, the water-based waterproof coating material may be composed of a one-component emulsion waterproof coating material. In the present invention, the water-based coating film waterproofing material is mainly composed of an acrylic emulsion, but in addition to this, an aqueous dispersion, a synthetic resin emulsion such as a urethane, vinyl acetate, ethylene vinyl acetate, acrylic styrene, etc. Commonly known aqueous dispersions such as emulsions, or blended coating waterproofing materials of these aqueous dispersions can be used. In addition, various usual additives can be blended as necessary. Other additive components include, for example, thickeners, antifoaming agents, preservatives, dispersants, dehumidifiers, antistatic agents, flame retardant aids, colorants, antioxidants, ultraviolet absorbers, fillers, etc. Is mentioned. Moreover, it is applicable not only to a one-component type but also to a multi-component type waterproofing coating material in which other components are added for the purpose of facilitating the formation of a coating film at a construction site.

In addition to the above, the present invention is an undercoat buffer sheet for an aqueous coating film waterproofing material for forming a waterproofing layer by impregnating and applying an aqueous coating film waterproofing material to a base, which promotes uniform promotion of moisture transpiration. An undercoat buffer sheet for an aqueous paint film waterproofing material comprising a surface material for preventing the occurrence of cracks due to drying shrinkage of the aqueous paint film waterproofing material and a means for preventing permeation of the waterproofing material into the groundwork, which is stretched on the lower surface of the surface material. To solve the above-described conventional problems.

In the base buffer sheet for water-based coating film waterproofing material, the surface material may be composed of a synthetic fiber nonwoven fabric, and the means for preventing penetration into the base may be composed of a water-impermeable film. Examples of the shape of the surface material include woven fabrics, non-woven fabrics, and mat shapes made of various synthetic fibers. Examples of fiber types include various fibers such as polyamide fibers, vinylon fibers, polyester fibers, polyethylene fibers, and polypropylene fibers. Can be used.
Although the surface material is effective regardless of the fiber length, a short fiber nonwoven fabric composed of discontinuous filaments is preferred. In addition, the thickness of the surface material required for securing a coating film thickness of 1 to 3 mm as in the conventional method by one application of the aqueous coating material is 0.3 to 2.5 mm, preferably 0.5 to 1.5 mm. If it is thinner than 0.3 mm, the fiber does not spread in the coating film with respect to the coating amount of the waterproof material, so the coating film does not dry uniformly and the reinforcing effect is not sufficient, so the effect of preventing cracks during the drying process is obtained. I can't.
On the other hand, if the thickness is 2.5 mm or more, the coating material is insufficient with respect to the surface material, so that it is not sufficiently impregnated and a void is formed in the coating film.

Means for preventing penetration into the base constituting the base impact sheet for water-based coating materials may be any film-like material having water impermeability, such as synthetic resin such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinyl chloride. , Fluororesin, polycarbonate, polyester, polyimide, polyethylene terephthalate, polytetrafluoroethylene, and the like, and metal films represented by aluminum foil can also be used.

Furthermore, in any of the water-based coating material base buffer sheets, the pressure-sensitive adhesive layer includes a pressure-sensitive adhesive layer formed on the lower surface of the penetration preventing means as a bonding means to the base, and a release paper or a release film covering the pressure-sensitive adhesive layer. The agent layer is formed in a scattered manner and may be configured such that an air passage can be formed by an insulating portion between the two when the base buffer sheet for an aqueous coating material and the base are laminated.

With the above configuration, the present invention can obtain the following effects.
A. The drying property of the coating material is improved.
B. Since drying proceeds evenly, it is possible to prevent cracks during the drying process.
C. It is possible to prevent inconvenience due to the influence of moisture from the lower ground such as blistering due to water vapor and poor adhesion to the ground surface.
D. The film surface height can be made uniform by absorbing and buffering the unevenness of the ground.
E. It is possible to prevent inconvenience such as breakage of the waterproof layer following the change of the lower ground.
F. The strength of the waterproof layer can be improved.

That is, in the invention of the present application, the waterproof coating structure is formed by forming a waterproof layer with a water-based coating film waterproofing material on the base via a base buffer sheet for water-based coating film waterproofing material, A surface material that prevents moisture from spreading due to drying shrinkage of the water-based coating film waterproof material and a film that is stretched on the lower surface of the surface material to prevent the waterproof material from penetrating into the ground. Since it is configured, there is little risk to the environment at various points, including construction, and quick drying is possible, but there is no risk of cracking due to drying, and deformation of the foundation such as concrete A water-based coating film waterproofing system that can follow fluctuations, avoids a bulge phenomenon due to moisture evaporation from the substrate, and can efficiently form a uniform coating thickness becomes possible.

  Applying a water-resistant waterproofing coating on a concrete base with a water-based coating waterproofing material only by applying a water-based waterproofing coating base cushioning sheet to the base as an auxiliary material enables efficient drying. We have realized a waterproof system that has no cracks, has excellent follow-up to substrate fluctuations, and can handle the cause of blistering. In the present invention, the water-based coating film waterproofing material is mainly composed of an acrylic emulsion, but in addition to this, an aqueous dispersion, a synthetic resin emulsion, such as urethane, vinyl acetate, ethylene vinyl acetate, acrylic styrene emulsion, etc. A generally known waterproof coating material blended with an aqueous dispersion can be used. Moreover, not only a one-component type but a multi-component waterproof material can also be applied.

FIG. 1 is a cross-sectional view showing one embodiment of a waterproof coating structure A in which a waterproof layer is formed of a water-based waterproof coating material. The waterproof coating structure A includes a rooftop of a building, a concrete base 1 that requires the formation of a waterproof layer, and an aqueous buffer waterproof material base buffer sheet impregnated with an aqueous paint waterproof material.
And the said base-material buffer sheet for water-system coating-film waterproofing material is the surface material 2 for preventing the crack generation by the drying shrinkage | contraction of the said water-system coating-film waterproofing material while aiming at the uniform acceleration | stimulation of water | moisture content, and the said concrete base | substrate 1 and It has a penetration preventing means that is formed between the surface material 2 and prevents the waterproof material from penetrating into the ground. In this embodiment, the permeation preventing means is formed of a water-impermeable film 5 or the like, and a mesh sheet 3 made of glass fibers and a glass nonwoven fabric 4 are interposed between the surface material 2 and the water-impermeable film 5. Although it is equipped, the toughness of the permeation preventing means and the good absorbability of the fluctuation of the base are realized, but the permeation preventing means may be constituted only by the water-impermeable film 5 depending on the case.
In the figure, 6,6. . . Is an adhesive layer or pressure-sensitive adhesive layer formed between the water-impermeable film 5 and the base 1 and fixing the base and the base buffer sheet for water-based coating film waterproofing material. Ventilation path 7,7 by the insulation part which arises. . . The waterproof layer is prevented from being blistered due to moisture or the like that evaporates from the base 1.

And in the said coating-film waterproofing structure A, the said surface agent 2 is comprised by the nonwoven fabric of the predetermined thickness formed with the synthetic fiber.
That is, the specification of the nonwoven fabric which concerns on this Example is as follows.
Textile material: Polyester short fiber nonwoven fabric (S634: Kurashiki Spinning Co., Ltd.)
Thickness: About 0.8mm Usage (weight): 60g / m2 Water-based coating film waterproofing material applied to the nonwoven fabric: About 1.5-3.5kg / m2

For this reason, the water-based waterproofing membrane coated and impregnated on the non-woven fabric (surface material 2) is divided by the fibers to accelerate the drying, and maintains the state of being held and bonded by the entangled fibers, so that the drying can be accelerated. The conventional crack does not occur.
That is, in the prior art, since the surface of the coating film is first dried to form a skin, it takes time to dry, and inconveniences such as generation of cracks frequently occur due to non-uniform drying shrinkage. It is.
In order to avoid this problem, attempts have been made to mix a filler agent such as cement in the water-based coating waterproof material, but the problem of waterproof reliability and mixing when the filler agent is mixed with the coating waterproof material In this case, a large amount of foam was generated by stirring, resulting in poor leveling and poor workability. In the case of the synthetic fiber nonwoven fabric as the surface material 2 according to the present application, there is no inconvenience as described above, and a coating film with a predetermined thickness can be uniformly formed by simply applying and impregnating the nonwoven fabric with a water-based coating film waterproofing material, and drying is also possible. It can quickly finish efficiently on a smooth surface without cracks.

On the other hand, in the waterproof coating structure according to the embodiment, the permeation preventing means includes a glass fiber nonwoven fabric 3 bonded to the synthetic fiber nonwoven fabric as the surface material 2, an impermeable film 5 bonded to the concrete base 1, and a surface material. Asphalt pressure-sensitive adhesive layers 6, 6 formed interspersed between the mesh-like sheet 4 interposed between the fabric 2 and the glass fiber nonwoven fabric 3, and the water-impermeable film 5 and the surface of the concrete substrate 1, . . . . And has. For this reason, between the water-impermeable film 5 and the concrete base | substrate 1 surface, the ventilation path (insulation part) 7,7. . . Since water vapor generated from the surface of the concrete base 1 is discharged as needed, inconveniences such as deformation and tearing of the waterproof layer due to the swelling phenomenon can be avoided.
In this embodiment, the glass fiber nonwoven fabric 3 has a weight per unit area of 50 g / square meter, and the mesh sheet 4 is formed of glass fibers having square holes of about 5 mm in length and width.

  As described above, the base material sheet for the water-based coating film mild waterproof material composed of the surface material 2, the water-impermeable film 5 which is a permeation preventing means, and the like has flexible members, so The behavioral stress due to the cause is properly absorbed and no fatal damage such as tearing occurs.

  In the waterproof structure using the base impact sheet for the water-based coating film moderately waterproof material of the present invention, the water-based waterproof material is further coated on the waterproof layer to improve the aesthetics, waterproofness and durability of the waterproof structure. Can do. The application amount of the water-based coating film waterproofing material applied to the second layer is 0.2 to 2.0 kg / square meter, and preferably 0.5 to 1.5 kg / square meter. If it is less than 0.2 kg / square meter, the coating thickness after dry film formation cannot be obtained sufficiently and the effect of two-layer coating cannot be obtained. In addition, cracks may occur during the drying process at 2.0 kg / square meter or more. Further, a top coat may be applied for the same purpose. As the top coat, generally known ones can be used, and the waterproof layer may be formed by applying the top coat on the first layer or the second layer of the aqueous coating material.

In the above, the base buffer sheet for water-based coating film waterproofing material is adhered and fixed to the surface of the concrete base 1 by the asphalt-based adhesive material layer 6, but there are two generally known mechanical fixing means such as screwing instead of adhesive fixing. A fixing method may be adopted.
In the case of screwing, an insulating part communicating with each other is formed between the screws, and water vapor generated from the surface of the concrete base 1 is discharged at any time to prevent the occurrence of blistering.

In this embodiment, a one-component emulsion coating waterproof material mainly composed of acrylic emulsion is used as the water-based coating waterproof material. That is, the structure of the water-based coating film waterproof material according to the embodiment is shown below.

Composition ratio (parts by weight)
Elastic acrylic emulsion (Aron Base D: Toa Gosei Co., Ltd.)
Resin content 40-60% 100 parts calcium carbonate (NS # 100: Nitto Flour Chemical) 40-80 parts Dispersing wetting agent (EDAPLAN 480: Enomoto Kasei Co., Ltd.) 0.1-0.5 parts Antifoaming agent (AGITAN 760: Enomoto Kasei Co., Ltd.) 0.1-0.5 parts Viscosity modifier (TAFFIGEL PUR 40: Enomoto Kasei Co., Ltd.) 0.1-0.5 parts

FIG. 2 is a partially cutaway perspective view showing one embodiment of the base buffer sheet B for water-based coating film waterproofing material according to the present invention. This base cushion sheet for water-based coating film waterproofing material is used as an auxiliary material when forming a waterproof layer by applying and laminating a water-based coating film waterproofing material on the concrete floor surface, etc. By applying a waterproof cushioning base buffer sheet by an adhesive means or a machine fixing means, and applying a water-based coating waterproofing material thereon, it has excellent performance as described in Example 1 under short-time drying. A waterproof layer can be obtained.

The water base waterproof sheet base cushioning sheet B shown in FIG. 2 is substantially composed of the surface material 2 and the permeation preventing means shown in FIG. That is, the permeation preventing means includes a mesh sheet 4 attached to the lower surface of the synthetic fiber nonwoven fabric 2 as a surface material, a glass fiber nonwoven fabric 3 that is a reinforcing mat interposed on the lower surface of the mesh sheet 4, and the glass. A water-impermeable film 5 to be affixed to the lower surface of the fiber nonwoven fabric 3, adhesive layers (described later in FIG. 3) formed on the lower surface of the water-impermeable film 5, and release paper 8 covering these adhesive layers. And is configured.

The synthetic fiber nonwoven fabric 2 is constituted by a nonwoven fabric having a thickness of about 1 millimeter formed by discontinuous filaments. Therefore, the water-based waterproofing coating material impregnated and impregnated into the nonwoven fabric becomes intertwined, and uniform drying is promoted in the entire coating layer, and the conventional shrinkage at a specific part such as the surface layer of the coating material progresses at an early stage. No cracks occur.

The water-impermeable film 5 is made of a polyester film, and the mesh-like sheet 4 is made of glass fiber. Further, on the lower surface of the water-impermeable film 5, as shown in FIG. . . . Are scattered.
Therefore, when the release paper 8 of the base buffer sheet B for water-based coating film waterproofing material is peeled off and applied to a concrete floor surface or the like, an air passage (insulating portion) communicates between the water-impermeable film 5 and the concrete floor surface. ) 7,7. . . Since water vapor generated from the concrete floor surface is discharged as needed, inconveniences such as deformation and tearing of the waterproof layer due to the swelling phenomenon can be avoided.
The base buffer sheet B for water-based coating film waterproofing material described above is fixed to the base or the like by the pressure-sensitive adhesive layer 6, but instead of this, the use of mechanical fixing means such as screws can also be used. It is possible to join by.
By adopting the base buffer sheet B for water-based coating film waterproofing material as described above, high-efficiency and high-quality work can be performed in the water-based coating film waterproofing method, and the coating film waterproof structure has various advantages as described above. Will be provided.

It is sectional drawing which shows one Example of the coating-film waterproof structure A which formed the waterproof layer with the water-system coating-film waterproof material. It is a partially notched perspective view which shows one Example of the buffer sheet B for aqueous | water-based coating-film waterproof materials. It is a perspective view which shows the lower surface of the water-impermeable film in FIG.

Explanation of symbols

A Waterproof coating structure B Base cushion sheet for water-based waterproofing coating 1 Concrete foundation 2 Surface agent (synthetic fiber nonwoven fabric)
3 Glass fiber nonwoven fabric (reinforced mat)
4 Mesh-like sheet 5 Water-impermeable film 7 Air passage 8 Release paper

Claims (8)

A waterproof coating structure in which a waterproof layer is formed on the ground with a water-based waterproof coating material, and the substrate is stretched on the substrate by an adhesive, an adhesive, or a screw-fastening means. A base buffer sheet for water-based coating waterproofing material that promotes uniform promotion and prevents cracks due to drying shrinkage of the water-based coating waterproofing material, and a water-based coating waterproofing impregnated in this base buffer sheet for water-based coating waterproofing material A waterproof coating structure comprising materials. In the waterproof structure of a coating film according to claim 1, the base buffer sheet for water-based coating film waterproofing material is a surface material and a surface material for preventing the generation of cracks due to drying shrinkage of the water-based coating film waterproofing material by promoting uniform moisture transpiration. A waterproof coating structure characterized by comprising a film stretched on the lower surface to prevent penetration of a waterproof material into the ground. 3. The waterproof coating structure according to claim 2, wherein the surface material is composed of a synthetic fiber nonwoven fabric and a mesh sheet and / or a glass fiber nonwoven fabric is interposed between the nonwoven fabric and the film stretched on the bottom surface. A waterproof coating structure characterized by that. The waterproof coating structure according to any one of claims 1 to 3, wherein the adhesive or pressure-sensitive adhesive material as the joining means is interspersed with a base, and an air passage is provided between the base cushion sheet for the water-based paint waterproof material and the base. A waterproof coating structure characterized by being formed. 5. The waterproof coating structure according to claim 1, wherein the water-based waterproofing coating material is a one-component emulsion waterproofing coating. A base buffer sheet for a water-based coating waterproof material for forming a waterproof layer by impregnating and applying a water-based coating waterproof material to a base, and promoting the uniform promotion of moisture transpiration of the water-based coating waterproof material A base buffer sheet for water-based coating film waterproofing material, comprising a surface material that prevents generation of cracks due to drying shrinkage, and means for preventing penetration of the waterproofing material into the base material, which is stretched on the lower surface of the surface material. The base cushion sheet for water-based coating film waterproofing material according to claim 6, wherein the surface material is composed of a synthetic fiber nonwoven fabric and the permeation preventing means is composed of a water-impermeable resin film. Buffer sheet. The base buffer sheet for water-based coating film waterproofing material according to claim 6 or 7, comprising a release paper that forms an adhesive layer on the surface of the permeation preventive means as a means for bonding to the base and covers the adhesive material layer, The pressure-sensitive adhesive layer is interspersed and formed, and an air passage is formed by an insulating portion between the base buffer sheet for water-based coating film waterproofing material and the base, which is formed between the two. Base cushioning sheet for waterproofing.

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