JP2000160720A - Moisture-proof sheet for interior wall of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building interior wall moistureproof sheet capable of preventing condensation from forming inside a wall, especially during the summer, when installed between the interior wall board and the heat insulating material layer of a building such as a house. SOLUTION: This sheet is laminated between the interior wall board 4 and the interior wall heat insulating material layer 5 of the interior wall of a building during use. Only one side of a moistureproof resin sheet base material 1 is laminated with a moisture absorbing and releasing layer 2 and a moistureproof resin sheet 10 is located on the interior wall board 4 and laminated. The moisture absorbing and releasing layer 2 is located on the interior wall heat insulating layer 5 side.

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 a building, and more particularly to a moisture-proof sheet for a building inner wall which is suitably used for a building inner wall in a region where high humidity occurs in summer.

[0002]

2. Description of the Related Art In recent years, such as houses and the like, in which high airtightness and high heat insulation are advanced, there is almost no difference between room temperature and inner wall surface temperature as long as high airtightness and high heat insulation are complete. Dew condensation on the wall surface is rare.

However, in an actual building such as a house, there is no case where the airtightness is perfect, and a certain gap always exists. Therefore, moisture generated in the room may flow into the wall, and dew condensation (so-called “condensation in the wall”) may occur in a portion where the temperature is lower than the dew point in the thickness direction of the heat insulating material.

[0004] Particularly in a house or the like in a cold region, since the warm humidity due to the heating of the room is discharged to the outside, dew condensation in the wall easily occurs. As a countermeasure, the following construction methods have been conventionally employed.

More specifically, as shown in FIG. 3, a moisture-proof sheet 8 made of polyethylene or the like is provided between the inner wall substrate 4 and the outer wall substrate 7 of a building such as a house from the back side of the inner wall substrate 4 and the outdoor side thereof. First, a heat insulating material layer 5 mainly made of a fibrous heat insulating material such as glass wool or rock wool, and a ventilation layer 6 made of a void are sequentially formed on the outer wall substrate side. And furthermore
At the interface between the heat insulating material layer 5 and the ventilation layer 6, a moisture permeable waterproof sheet 9 having a property of allowing moisture to pass but not allowing water to pass is provided.

[0006] In this way, by increasing the moisture permeation resistance on the indoor side and decreasing the moisture permeation resistance on the outdoor side, it is generated indoors,
Moisture that has entered the heat insulating material layer from the joint of the inner wall substrate and the like is quickly discharged from the heat insulating material layer through the ventilation layer, thereby preventing dew condensation in the wall without accumulating moisture in the wall.

[0007]

By the way, in the summer hot and humid climate in the warm west of Kanto,
Moisture movement inside the wall is opposite to that in winter cold regions. In other words, the moisture-permeable waterproof sheet transmits moisture in both directions,
In the summer, the outside air becomes hotter and humid than the inside of the building due to air conditioning or the like, and the hot and humid air flows in from the ventilation layer 6. Then, it gradually cools down and becomes below the dew point temperature in the wall, resulting in dew condensation. Therefore, in cold regions such as Hokkaido and the Tohoku region, only the dew condensation inside the wall in winter should be considered.However, in regions with a hot and humid climate in the west of Kanto in the summer, the dew condensation in the wall in summer should be considered. Must be done.

[0008] When such dew condensation in the wall occurs,
Not only does the performance of the heat insulating material deteriorate, but it also causes mold and fungi, and causes corrosion and rust of the wall and its surrounding members, which adversely affects the durability of the house. In particular, in the summer season, even if dew does not occur, the inside of the wall is likely to be in a high-humidity state, and as a result, there is a possibility that damage similar to dew condensation may occur.

Accordingly, the present invention provides an inner wall moisture-proof sheet for a building which is laminated between an inner wall substrate of a building such as a house and a heat insulating material layer, and which can prevent the occurrence of dew condensation in the wall particularly in summer. The purpose is to provide.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a sheet to be used by being laminated between an inner wall substrate of an inner wall of a building and an inner wall heat insulating material layer, and comprising a moisture-proof resin sheet substrate. Wherein the moisture-absorbing / desorbing layer is laminated only on one side of the substrate, the moisture-proof resin sheet is positioned and laminated on the inner wall substrate side, and the moisture-absorbing and desorbing layer is positioned on the inner wall heat insulating layer side. The present invention provides a moisture-proof sheet for building inner walls.

The moisture-proof sheet for a building inner wall according to the present invention is effective between the inner wall substrate of a building such as a house and a heat insulating material layer to effectively prevent dew condensation in the wall not only in winter but also in summer. Can be prevented.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a moisture-proof sheet for a building inner wall according to the present invention will be described in detail. The moisture-proof sheet 10 for a building inner wall according to the present invention has a structure in which a moisture-proof resin sheet substrate 1 and a moisture-absorbing and releasing layer 2 are laminated as shown in FIG.

The material of the moisture-proof sheet substrate of the present invention includes:
For example, high density polyethylene, medium density polyethylene, polyethylene such as low density polyethylene, polypropylene,
Resins such as polyvinylidene chloride, polyvinyl chloride, and polyethylene terephthalate can be used. And
A melt of these resins can be formed into a moisture-proof sheet having a predetermined thickness by a known film forming method such as a calendar method, an inflation method, or a T-die extrusion method.

As the moisture-proof sheet substrate of the present invention, a polyethylene film (thickness: about 25 to 125 μm) is generally used from the viewpoint of performance and cost among sheets made of the above resin, and has sufficient transparency. Has a wet function.

It is also preferable that the surface and / or the back surface of the moisture-proof sheet substrate is subjected to a known easy adhesion treatment such as a corona discharge treatment, if desired. Alternatively, in order to further improve the moisture-proof performance, a thin film of silica or aluminum may be formed on the surface and / or the back surface of the moisture-proof sheet substrate by vacuum evaporation, sputtering, or the like.

The moisture-absorbing and releasing layer of the moisture-proof sheet of the present invention is preferably formed by adding a moisture-absorbing and releasing material to a resin binder. The resin containing the moisture-absorbing / desorbing material is not limited as long as the resin can hold the moisture-desorbing / desorbing material and can be formed in a layered form. It is preferable to use a polyolefin resin or an acrylic resin from the viewpoint of good properties.

Examples of the polyolefin resin include, for example, ethylenically unsaturated monomers such as ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer and ethylene-vinyl alcohol copolymer. Or terpolymers of monomers and other polymerizable monomers, for example, homopolymers consisting only of ethylenically unsaturated monomers such as polyethylene, polypropylene, polybutene and polymethylpentene For example, copolymers of ethylenically unsaturated monomers such as ethylene-propylene copolymer and ethylene-propylene-butene copolymer can be exemplified.

Examples of the acrylic resin include polymethyl (meth) acrylate, polyethyl (meth) acrylate, poly (butyl methacrylate), methyl (meth) acrylate-butyl (meth) acrylate. Polymer,
(Meth) acrylic acid such as methyl (meth) acrylate-2-hydroxyethyl (meth) acrylate, ethylene-methyl (meth) acrylate, and styrene-methyl (meth) acrylate Those composed of a homo- or copolymer containing an ester are exemplified. Here, (meth) acrylate is used in the meaning of acrylate and methacrylate. Of these,
Those having a glass transition temperature of 15 to 60 ° C are preferred.

In the present invention, among these resins,
Ethylene-vinyl acetate is used because the resin itself has a certain degree of moisture absorption / desorption properties, is well compatible with the moisture absorption / desorption material, and has a good dispersibility of the moisture absorption / desorption material so that the amount of addition can be increased. It is particularly preferable to use a copolymer or a saponified product thereof.

A mixture of one or more of these acrylic resins and polyolefin resins, for example,
Mixtures of an ethylene-vinyl acetate copolymer and an acrylic resin, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, and resins such as polyvinyl chloride, nylon, ABS, and polystyrene can also be used.

Examples of the hygroscopic material include activated clay, acid clay, sepiolite, diatomaceous earth, tobermorite, zeolite, and inorganic materials such as silica gel, a saponified graft copolymer of starch and acrylonitrile, and a cross-linked polyvinyl alcohol ( Any of organic materials such as a polymer water-absorbing material) is used.

Among these moisture-absorbing and desorbing materials, because of the reproducibility of moisture absorption and desorption cycles, the absence of swelling due to moisture absorption, the antifungal property, and the manufacturing cost,
Inorganic ones are preferably used. Among them, activated clay having good compatibility with the resin and good film forming and coating applicability of the resin composition added to the resin is more preferable.

Activated clay (montmorillonite) is clay that has been acid-treated to enhance its activity. Normally, natural acid clay or clay similar thereto is dried at room temperature to form a powder, which is heated at a temperature of 90 ° C. or more under normal pressure or pressure at an appropriate amount of an acid such as sulfuric acid, and heated. After filtration and washing, 120
What was dried at -200 ° C is used. Activated clay, due to its strong adsorption properties and the distribution of porous pore sizes,
It is known to have high moisture absorption / release performance.

Activated clay is a powerful moisture absorbing and releasing agent, does not dissolve in or swell with water, and does not deteriorate or mold when exposed to air for a long period of time. And moisture can be repeated.

The moisture-absorbing and desorbing material is preferably used in the form of fine particles (hygroscopic and desorbing fine particles) and uniformly dispersed in the resin without causing separation and sedimentation. By containing in the form of fine particles, as described later, when forming a film, a part of the fine particles is extruded from the inside of the resin layer to the resin surface,
The areal density of the particles exposed on the resin surface increases. Also, due to the shear stress between the particles and the surrounding resin, the resin layer is made porous, and the particles inside the resin layer also circulate with the outside air,
The function of absorbing and releasing moisture will be used more effectively.

The average particle size of the hygroscopic material used in the present invention is preferably about 0.1 to 100 μm. The average pore diameter is 10 to 60 in the sense that the humidity is kept at 40 to 60%.
Å, preferably about 20 to 30 で is good in terms of the moisture absorbing and releasing effect.

The amount of the hygroscopic material added to the resin is as follows:
50 to 15 parts per 100 parts by weight of resin (binder)
About 0 parts by weight is preferable. When the amount is less than 50 parts by weight, the moisture absorption / release performance is not sufficiently exhibited. On the other hand, when it is added in an amount of 150 parts by weight or more, the composition obtained by adding the moisture-absorbing / desorbing material to the water-dispersed emulsion increases the viscosity, and the coating suitability decreases. or,
The moisture absorbing / releasing resin layer obtained as a coating film has a reduced strength and is brittle.

When an acidic substance such as activated clay is used as the moisture absorbing / releasing material, it is more preferable that the resin contains an alkaline additive in addition to the moisture absorbing / releasing material. Acid hygroscopic materials such as activated clay can cause yellowing, etc. as a result of a light resistance test and a heat resistance test (a test for accelerating the effect of sunlight entering through a window) on a resin in which the acidity is dispersed. . In the present invention, in order to avoid such a problem, it is preferable to suppress the light yellowing resistance by adjusting the pH by mixing an alkaline additive together with the acidic moisture absorbing / releasing material in the resin.

Examples of the alkaline additive include ammonia (aqueous ammonia), hydroxides such as sodium hydroxide and potassium hydroxide, carbonates such as sodium carbonate and potassium carbonate, and hydrogen carbonate such as sodium hydrogen carbonate and potassium hydrogen carbonate. Salts and the like can be mentioned. The amount of the alkaline additive to be added is, for example, 10% by weight or more, preferably 20% by weight of activated clay in the case of aqueous ammonia (28% by weight).
It is about.

The resin contains a moisture-absorbing / desorbing material and, if desired, an alkaline additive. If necessary, a flame retardant such as magnesium hydroxide or aluminum hydroxide, or 10,10'-oxybisphenoxyarsine may be used. And antibacterial agents such as zeolite carrying silver ions, formaldehyde scavengers such as organic amino compounds, extenders such as calcium carbonate, calcium silicate and barium sulfate, bis- (2,2,6,6-tetramethyl) Hindered amine radical scavengers such as -4-piperidinyl) sebacate, light stabilizers such as radical scavengers such as piperidine radical scavengers, antioxidants such as alkylphenols, amines and quinones, benzophenones, salicylates, Various UV absorbers such as benzotriazole and acrylonitrile, silicon -Based or non-silicon based defoamers and dispersants such as polycarboxylic acids, titanium white, carbon black, coloring pigments such as phthalocyanine blue, heat stabilizers,
In addition to the plasticizer, a foaming agent as described below can be added.

In particular, when a foaming agent is added, a resin having a large number of cavities in the resin layer is obtained, and the air permeability is good, and therefore, the moisture absorption / release property is also good.

The amount of the moisture-absorbing and releasing material in the binder resin is preferably about 20 to 900 parts by weight based on 100 parts by weight of the resin. The coating amount is such that the coating thickness is 1 to 20.
It is preferable that the thickness be about 0 μm. If the mixing ratio or coating amount (coating thickness) of the moisture absorbing / releasing material is too large, the movement of moisture from the indoor side to the ventilation layer side in winter may be hindered and the original function of the ventilation method may be reduced. is there.

There is no particular limitation on the method of imparting a moisture absorbing / releasing function to the moisture-proof sheet substrate as long as the means can impart moisture absorbing / releasing performance to only one surface of the moisture-proof sheet substrate as a result. For example, (1) a method of first forming a moisture-proof sheet substrate and then forming a moisture-absorbing / desorbing layer on only one surface of the moisture-proof sheet substrate, and (2) a method of simultaneously absorbing moisture when manufacturing the moisture-proof sheet substrate. There is a method in which a moisture release layer is formed by laminating a moisture-proof sheet substrate.

As a method for forming a moisture-absorbing / desorbing layer on one side of the moisture-proof sheet substrate in the above (1), for example, a resin-based coating material containing a moisture-absorbing / desorbing material described later on one side of the moisture-proof sheet substrate is used. The liquid composition (water-dispersed emulsion) is coated on one surface of the moisture-proof sheet substrate with a coating machine such as a roll coater, a comma coater, or a curtain floater.
Coating with a thickness of 300 μm, then, for example,
Heat and dry at ~ 200 ° C for 30 seconds to 1 hour, then
For example, it is solidified by heating and drying at about 200 to 250 ° C. for 30 seconds to 1 hour. When a foaming agent is further added, it can be foamed to obtain a laminate of a moisture-proof sheet substrate and a moisture-absorbing and releasing resin layer.

In order to form or coat the above resin,
Although it can be used in the form of an organic solvent solution, a heated melt, or the like, it is preferably used in the form of an aqueous dispersion emulsion in terms of adjusting the pH. That is, it is preferable that the pH of the emulsion is adjusted to an alkaline range by blending an alkaline additive, if desired, in an aqueous dispersion emulsion of a mixed resin comprising one or more of a polyolefin resin and an acrylic resin.

The acidity of an acidic moisture absorbing / releasing material such as activated clay is determined by the residual amount of sulfuric acid treatment performed to increase the activity.
And that the basic component was eluted by the acid treatment. Because it is difficult to completely neutralize it,
It is preferable that the emulsion is apparently in an alkaline region. Further, it is preferable to set the pH value to about 8 to 11 in consideration of the safety of the worker.

As the method (2), for example, when a moisture-proof sheet substrate is formed by an extrusion film method or the like, a resin layer into which a moisture-absorbing and releasing material is kneaded is co-extruded.
Some are molded.

The moisture-proof sheet 10 for a building inner wall according to the present invention comprises:
It has a laminated structure of a moisture-proof sheet substrate 1 and a moisture-absorbing / desorbing layer 2 containing a moisture-absorbing / desorbing material 3 as shown in FIG. 1. For example, as shown in FIG. The moisture-proof resin sheet 10 can be positioned between the heat-insulating material layer 5 and the inner-wall substrate 4 side, and the moisture-absorbing / desorbing layer 2 can be positioned and stacked on the heat-insulating material layer 5 side. In FIG.
The ventilation layer 6 is further provided between the heat insulation layer 5 and the outer wall substrate 7 on the outdoor side.
Is provided.

Examples of the inner wall substrate 4 of the building include a calcium silicate plate, a wooden plate and the like, and their thickness is usually about 5 to 20 mm.

The heat insulating material constituting the heat insulating material layer 5 includes glass wool and rock wool.

As described above, the moisture-proof sheet for building inner walls according to the present invention is a moisture-proof sheet for building inner walls for preventing dew condensation in walls of buildings, especially in houses and the like in a climatic climate of high temperature and high humidity in summer. Useful as

[0042]

Next, the present invention will be described more specifically with reference to examples and comparative examples.

EXAMPLE An acrylic copolymer resin (Chuo Rika Co., Ltd.) was coated on one side of a 50 μm-thick polyethylene film (a polyethylene film manufactured by Mitsui Toatsu Chemicals Co., Ltd., the surface of which was subjected to easy adhesion treatment). )) Product name "Licabond ET-84") 10
A mixture of 0 parts by weight and 70 parts by weight of activated white clay (manufactured by Mizusawa Chemical Co., Ltd., trade name: Galeon Earth V2R) is applied by a roll coating method to a thickness of 20 μm (when dried). Thus, a moisture-proof sheet having the same layer configuration as that shown in FIG. 1 was produced. Next, as shown in FIG. 2 described above, the obtained moisture-proof sheet was laminated with the moisture-proof sheet surface positioned on the inner wall substrate side, and the moisture-absorbing and desorbing layer surface was positioned on the heat insulating material layer side.

Comparative Example As a comparative example, the following moisture-proof sheet and moisture-permeable waterproof sheet were constructed in the same manner as shown in FIG.

Moistureproof sheet: polyethylene film having a thickness of 50 μm (polyethylene film manufactured by Mitsui Toatsu Chemicals, Inc.) Moisture permeable waterproof sheet: Tyvek sheet (polyethylene nonwoven fabric manufactured by DuPont)

Test for Preventing Condensation in JISA 6111 The moisture-proof sheets of Examples and Comparative Examples installed as described above were tested for the effect of preventing condensation in the wall in an environment based on JISA 6111 as shown in Table 1 below. Was.
The results are shown in Table 1.

[0047]

[Table 1]

As is clear from Table 1, when the moisture-proof sheet of the example was used, it was found that dew condensation in the wall was prevented under an environment similar to summer and winter. on the other hand,
When the moisture-proof sheet of the comparative example was used, no condensation in the wall was observed in an environment similar to winter, but condensation in the wall was generated in an environment similar to summer.

[0049]

As described above, the moisture-proof sheet for a building inner wall according to the present invention is capable of insulating the inner wall substrate of a building such as a house having a climate where the temperature and humidity are low and high in winter and high and high in summer, respectively. It is constructed between the material layer and
It is possible to extremely effectively prevent dew condensation inside the wall of the building.

Further, in the building on which the moisture-proof sheet for building inner walls of the present invention is installed, not only the occurrence of dew condensation inside the wall but also the humidity inside the wall can be kept below a certain level, and molds and fungi can be kept inside the wall. Since it does not propagate, the performance of the heat insulating material does not decrease and the durability is not adversely affected.

[Brief description of the drawings]

FIG. 1 is a structural sectional view of a moisture-proof sheet for an inner wall of a building according to the present invention.

FIG. 2 is a cross-sectional view of the construction of the moisture-proof sheet for a building inner wall according to the present invention.

FIG. 3 is a cross-sectional view showing a conventional moisture-proof sheet and a moisture-permeable waterproof sheet for preventing dew condensation in a wall.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Moisture-proof sheet | seat base, 2 ... Moisture-absorbing / desorbing layer, 3 ... Moisture-absorbing / desorbing material, 4 ... Inner wall substrate, 5 ... Heat insulation material layer, 6 ... Vent layer, 7 ... Outer wall substrate, 10 ... Moisture-proof sheet of this invention

Claims (1)

[Claims] 1. A sheet to be used by being laminated between an inner wall substrate and an inner wall heat insulating material layer of an inner wall of a building, wherein a moisture-absorbing and releasing layer is laminated only on one side of a moisture-proof resin sheet base material. The moisture-proof sheet for building inner walls, wherein the moisture-proof resin sheet is positioned and laminated on the inner wall substrate side, and the moisture absorbing / releasing layer is positioned on the inner wall heat insulating layer side.