JPH11207881A - Moistureproofing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation and breeding of bacteria and a mildew at a moistureproofing sheet itself and its circumference even if an interior of a wall or the like becomes highly humid to form a dew in summer by giving antibacterial properties and a mildewproofness to at least a surface of the sheet for a building. SOLUTION: The moistureproofing sheet 1 comprises an antibacterial and mildewproofing layer 3 or the like formed on a surface of a moistureproofing sheet base material 2. In the case of using the sheet 1, the sheet 1 is executed so that the layer 3 side becomes a heat insulator side. Or, the layers 3 may be provided on both front and rear surfaces of the material 2. In order to form the layer 3 on the surface of the material 2, there is used a method for coating the surface of the material 2 with a composition containing an antibacterial and mildewproofing agent in a binder resin, a method for co-extruding a binder resin containing the antibacterial and mildewproofing agent to one side surface of the material 2 at the time of manufacturing the material 2, a method for laminating a sheet or the like executed with antibacterial and mildewprooving treatment on a surface of the material 2 or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture-proof sheet for architectural use, and more particularly, to a heat-insulating material such as glass wool, affixing to the inner surface of a flash door for warpage prevention, and rain leakage. The present invention relates to a moisture-proof sheet used for prevention.

[0002]

2. Description of the Related Art In a recent house with high airtightness and high heat insulation, the difference between the room temperature and the surface temperature of the inner wall hardly occurs, so that dew condensation on the surface of the wall may occur. It's gone. However, when the airtightness is not perfect (in a real house, when the airtightness is perfect, there is no airtightness and there is always a “constant gap”), and the moisture generated in the room flows into the wall. However, dew condensation occurs in a portion where the temperature is lower than the dew point in the thickness direction of the heat insulating material.

[0003] In a house in a cold region, the following construction method is adopted as a countermeasure against the "condensation in the wall". (A) A moisture-proof sheet is installed on the back surface of the interior base material, and a heat insulating material (mainly glass wool /
Between the fiber insulation such as rock wool) and the outer wall material,
Form a ventilation layer. Further, a moisture-permeable waterproof sheet having a property of passing moisture but not allowing water to pass is provided at the interface between the heat insulating material and the ventilation layer. (B) By increasing the moisture permeability resistance of the indoor side and decreasing the moisture permeability resistance of the outdoor side, moisture generated indoors is quickly discharged to the ventilation layer and water (rain, etc.) entering from the ventilation layer. Is
By not allowing the light to pass through the inside of the wall, it is possible to prevent condensation in the wall without accumulating moisture in the wall.

[0004]

However, the above-mentioned method has the following disadvantages. In the case of (a), in cold regions such as Hokkaido and Tohoku, it is sufficient to consider only the dew condensation inside the wall in winter, and there is no concern about the occurrence of mold. However, in warm regions west of Kanto, the hot and humid climate in summer In the climate, the movement of moisture in the wall is reversed, and dew condensation occurs in the wall even in summer. That is, by using cooling in summer, the high-temperature, high-humidity external air that has flowed in from the ventilation layer is gradually cooled in the wall, and condensed below the dew point temperature. In this case, since the temperature is high and humid in summer, it causes mold generation.

[0005] That is, dew condensation inside the wall not only lowers the performance of the heat insulating material, but also causes the generation of mold and fungi, and adversely affects the durability of the house. Furthermore, especially in summer, molds and fungi are likely to occur and propagate near the moisture-proof sheet where the temperature is lowest in the wall. On the other hand, in the case of (b), the moisture-permeable waterproof sheet transmits moisture in both directions, so that it is difficult for the moisture to accumulate in the wall and dew condensation is reduced, but moisture from the ventilation layer is also allowed to pass.

[0006] The current moisture-proof sheet does not take measures against bacteria and fungi, and there is a concern about the above-mentioned problems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. Even if the inside of a wall or the like becomes highly humid in the summertime and dew forms, the moisture-proof sheet itself and the generation and propagation of bacteria and fungi around it are provided. It is an object of the present invention to provide a moisture-proof sheet capable of preventing the occurrence of a moisture-proof sheet.

[0008]

The gist of the present invention is to provide a moisture-proof sheet for construction, wherein at least the surface of the sheet is provided with antibacterial and antifungal properties.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the moisture-proof sheet 1 of the present invention
An antibacterial / antifungal layer 3 or the like is formed on the surface of the moistureproof sheet substrate 2 to impart antibacterial / antifungal properties to the surface of the moistureproof sheet 1. When using the moisture-proof sheet 1, antibacterial
The work is performed so that the fungicide layer 3 side is the heat insulating material side.

Further, as shown in FIG. 2, the moisture-proof sheet 1 of the present invention comprises an antibacterial / antifungal layer 3
May be provided.

An antibacterial / antifungal layer 3 is formed on the surface of the moisture-proof sheet substrate 2.
Is formed by applying (coating) a composition obtained by adding an antibacterial / antifungal agent to a binder resin on the surface of the sheet substrate 2, or during the production of the moisture-proof sheet substrate 2, A method in which a binder resin containing a fungicide is coextruded on one surface of the moisture-proof sheet substrate 2 with the moisture-proof sheet substrate 2, or a paper or nonwoven fabric in which the surface of the moisture-proof sheet substrate has been subjected to an antibacterial / antifungal treatment as described below. Can be used.

Specific means for applying a composition comprising an antibacterial / antifungal agent and a binder resin to the surface of the moisture-proof sheet substrate 2 include roll coat, gravure roll coat, comma coat, spray coat, flow coat and the like. Is mentioned. Before applying the composition of the moisture-proof / mold-proof layer to the moisture-proof sheet substrate 2, the surface of the sheet substrate 2 is subjected to corona discharge treatment,
Plasma treatment or other easy adhesion treatment may be performed.

Although not shown, the moisture-proof sheet 1 is formed into a sheet by kneading an antibacterial and fungicide inside when forming the moisture-proof sheet base, and the antibacterial and fungicide is allowed to bleed on the surface. Thus, antibacterial and antifungal properties can be imparted to the sheet surface. When an antibacterial / antifungal agent is kneaded into a polyethylene sheet or the like, the antibacterial / antifungal agent naturally bleeds on the surface.
In addition, it is preferable to provide the antibacterial / antifungal layer 3 using a binder resin containing an antibacterial / antifungal agent from the viewpoint that the antibacterial and antifungal properties are maintained over a long period of time.

The moisture-proof sheet substrate 2 is not particularly limited as long as it is a moisture-proof film or sheet. However, in consideration of performance and cost, polyethylene films, especially high-density polyethylene films, are generally used. It is preferably used because it has sufficient performance. In addition, polyvinylidene chloride, polyvinyl chloride, polypropylene,
Films such as polyester resins can also be used. The thickness of the moisture-proof sheet substrate 2 is preferably 25 to 125 μm. The moisture-proof property of the moisture-proof sheet substrate 2 is roughly based on JIS Z
Moisture permeability of 0208 50 [g / m ² / 24hrs]
The following (converted to a thickness of 0.03 mm) is preferable.
In addition, in order to impart adhesiveness to a heat insulating material or a plywood, the surface, the back, or the high-quality paper on both sides of these synthetic resin films,
Paper such as Japanese paper and kraft paper, or nonwoven fabric may be laminated. In this case, at least paper or nonwoven fabric is used as the antibacterial / antifungal layer. For that purpose, antibacterial and
A paint containing a fungicide in a binder is applied, or paper or a nonwoven fabric is impregnated with an antibacterial / fungicide. These papers or nonwoven fabrics have a basis weight of about ²⁰ to 100 g / m ² .

As the antibacterial / antifungal agent (hereinafter simply referred to as "antibacterial agent"), the following compounds can be used.

Antibacterial Ag ⁺ , Cu ²⁺ , Zn ²⁺ , Hg
⁺ , Ni ²⁺ , and metal ions such as Cd ²⁺ (in particular, Ag ⁺
Is harmless to the human body and has a long lasting antibacterial effect, which is desirable in terms of safety and performance. ) Can be ion-exchanged into ion exchangers such as zeolite, apatite, glass, silica gel, phosphate, and zirconium phosphate (especially, zeolite and zirconium phosphate have high track record and reliability). Inorganic type supported.
The metal ion content is 0.1% by weight in the case of Ag ⁺
0.1 to 8% by weight in the case of Cu ²⁺ or Zn ²⁺ (JP-B-63-54013, JP-A-4-300975, and Patent No. 25).
29574, etc.).

In the above, antibacterial ions obtained by further adding ammonium ions to metal ions (Japanese Patent Publication No. 28646/1992, and Japanese Patent No. 25295)
No. 74).

Organic compounds having antibacterial properties, for example, P-
Aminobenzenesulfonamide, sulfathiazole,
Sulfapyridines such as sulfapyridine and sulfadiazine; dithiocarbamates such as dimethyldithiocarbamate and ethylenebisdithiocarbamate;
(2-furyl) {3- (5-nitro-2-furyl)} acrylamide.

Trimethoxysilylpropyloctadecyl ammonium chloride having antibacterial and antifungal properties,
10,10'-oxybisphenoxyarsine (trademark vanadin), 2 {(4-thiazolyl)} benzimidazole, bis (2pyridylthio {1} oxide) zinc,
2─N-octyl─4─isothiazoline─3─one,
2,3,5,6-cytochloro {4} (methylthio) phthalimide, N- (fluorodichloromethylthio) florimide, griseofulvin, tricomycin, amphotericin B and the like.

Antibiotics, for example penicillins such as phenoxymethylpenicillin and dicloxacillin, cephalosporins such as cefazolin, streptomycin sulfate such as streptomycin sulfate and paromomycin (sulfate), erythromycin such as erythromycin such as josamycin, tetracycline, and Tetracycline such as lolitetracycline nitrate; chloramphenicol; chloramphenicol such as thiamphenicol aminoacetic acid ester hydrochloride;

Among the above antibacterial agents, it is preferable to use an inorganic material because the antibacterial and antifungal properties can be maintained for a long period of time.

As the binder resin for the antibacterial / antifungal layer 3, a thermosetting resin such as a two-component curable polyurethane resin, an unsaturated polyester resin, an epoxy resin, and a melamine resin, an acrylic resin, a vinyl acetate resin, and a vinyl chloride resin are used. Thermoplastic resins such as vinyl acetate copolymers, cellulosic resins, thermoplastic polyester resins, and chlorinated polyolefin resins, and ultraviolet or electron beam curable resins composed of polyfunctional acrylate prepolymers or monomers are used.

The amount of the antibacterial agent to be added to the binder resin, the base sheet, the paper or the non-woven fabric depends on the amount of the binder resin 1
Usually about 0.1 part by weight to 5.0 parts by weight with respect to 00 parts by weight is preferable, but it is appropriately adjusted depending on the use environment and the desired antibacterial and antifungal effects.

The moisture-proof sheet of the present invention is used alone or in combination with a heat insulating material in the structure of a building such as the inside of a wall or an attic, and is attached to the inner surface of a flash door having a hollow structure. It can also be used for preventing the door from warping due to the movement of moisture in the hollow structure due to the temperature difference between the inside and outside of the door.

Example 1 A high-density polyethylene film (manufactured by Mitsui Toatsu Chemical Co., Ltd .: easy-adhesion treated product, thickness: 50 μm) was subjected to a corona discharge treatment on one surface, and then a two-liquid cross-linkable urethane-based resin (polyester polyol and 100 parts by weight of tolylene diisocyanate) and 2 parts by weight of an antibacterial and fungicide ("NOVALON (silver zirconium phosphate)" manufactured by Toagosei Co., Ltd.) were mixed at 5 μm / g by a gravure coating method. Dry coating was performed to obtain a moisture-proof sheet.

Comparative Example 1 A moisture-proof sheet was prepared using only the polyethylene film used in Example 1 (containing no antibacterial / antifungal agent on its surface).

Example 1 and Comparative Example 1 were prepared by the following method.
An antibacterial test and an antifungal test were performed on the moisture-proof sheet. Antibacterial test 0.2 ml of bacterial solution of Escherichia coli and Staphylococcus aureus was inoculated on the sample surface (3 cm x 3 cm), wrapped from above the sample surface, stored at 27 ° C for 6 hours, and then the remaining bacteria were washed out And the number of viable bacteria was measured (boiled lithographic culture method). Antifungal test The test was carried out according to JIS Z 2911. Tables 1 and 2 show the test results of and.

[0028]

[Table 1]

[0029]

[Table 2]

From the test results in Tables 1 and 2, it can be seen that Example 1 is superior to Comparative Example 1 in antibacterial properties and antifungal properties.

[0031]

The moisture-proof sheet of the present invention has antibacterial and fungicidal properties imparted to the surface of the sheet, so that molds and bacteria can be generated and propagate on the moisture-proof sheet itself even if the inside of the wall or the like becomes highly humid in summer. Can be prevented. In addition, the generation of mold around the moisture-proof sheet and around the moisture-proof sheet can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one example of a moisture-proof sheet of the present invention.

FIG. 2 is a sectional view showing another example of the moisture-proof sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Moisture-proof sheet 2 Moisture-proof sheet base 3 Antibacterial / antifungal layer

Claims (1)

[Claims] 1. A moisture-proof sheet for construction, wherein at least the surface of the sheet is provided with antibacterial and antifungal properties.