JPH0625443B2 - Moisture-proof construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a moisture-proof construction method for applying a paint for preventing condensation on wall surfaces.

[Prior Art] In order to prevent dew condensation on a building wall, conventionally, by inserting a heat insulating material such as glass wool, rock wool, or foamed synthetic resin board between the outer wall and the inner wall, the heat insulating property is improved and the dew condensation is prevented. In the case of concrete building structures, there are known technologies to prevent dew condensation, such as by mounting a foam synthetic resin board on the inner surface of the formwork when pouring concrete and pouring the concrete, and by integrating the concrete and the heat insulating material. In addition, for the purpose of preventing the inflow of moisture into the concrete itself, there are measures such as adding and mixing a water repellent such as stearate, and placing it.

It should be noted that there is no known improvement technique for preventing dew condensation on existing concrete buildings.

[Problems to be Solved by the Invention] As described above, as a measure for preventing dew condensation on an indoor wall, a technique for preventing a decrease in the temperature of the indoor wall surface and preventing dew condensation by inserting a heat insulating material between the outer wall and the inner wall is known. , The effect is recognized as compared with the case where no heat insulating material is used, but it is not a complete measure. That is, although the generation of dew condensation on the surface of the inner wall is reduced, there is a space layer between the outer wall and the heat insulating material, there is no dew condensation on the inner wall surface, but between the outer wall and the heat insulating material. Condensation has occurred. It is considered that this is because the wall and the heat insulating material are not in close contact with each other and a space layer exists. In order to solve this, it is necessary to bring the wall surface and the heat insulating material into close contact with each other and to increase the thickness of the heat insulating layer, which is not only structurally restricted but also economically expensive. Become.

In addition, in the case of concrete buildings, it has recently been proposed to add and mix water repellents such as stearates and the like, but the chemical stability of the water repellents themselves such as stearates is also proposed. There is a problem with it and it has not been put to practical use.

[Means for Solving Problems] In view of such circumstances, the present inventors have conducted earnest research on development of inexpensive and effective dew condensation prevention, and as a result, developed a novel paste-like coating material. INDUSTRIAL APPLICABILITY The present invention prevents dew condensation by coating on a wall surface, absorbs and desorbs moisture in accordance with changes in the surrounding humidity environment, and effectively prevents moisture from dehumidifying the interior of the room by using a paint for preventing dew condensation. It provides the law.

The moisture-proof construction method of the present invention is a coating component containing an organic or inorganic color-developing agent, an extender pigment, a diluent, an alkaline chemical, and a fungicide, and a powder or fiber of a highly water-absorbent resin, a fine powder perlite having hygroscopicity, and A paint composed of a solid component containing finely divided zeolite is applied to the interior surface of a building (for example, a wall surface or a ceiling surface), and a breathable wallpaper is attached to the applied surface.

In a preferred embodiment of the present invention, the total amount of the finely powdered perlite and the finely divided zeolite added to the coating composition is 10 to 40.
It is preferable to set it within the range of wt%, and the mixing ratio of fine perlite and fine zeolite is 1.5: 1 to 5:
It is preferably within the range of 1. Furthermore, it is preferable that the content of the superabsorbent resin be in the range of 0.01 to 2.0% by weight. In addition, in this invention, weight% refers to the weight ratio in the state which removed the diluent mentioned later.

In the present invention, among the coating components, as the organic or inorganic color developing agent, milk casein, soybean casein, glue, gelatin, funori, wheat flour, methyl cellulose, vinyl acetate powder, other water-soluble synthetic resins, sodium silicate, A material selected from known color-developing materials such as potassium silicate may be used, and among them, methyl cellulose is preferable.

Examples of white pigments include chalk, heavy calcium carbonate, light calcium carbonate, rice cake, barite powder, and clay.

As alkaline chemicals, slaked lime, sodium hydroxide,
Various alkaline substances such as potassium hydroxide and magnesium hydroxide are used.

As the diluent, in addition to water, alcohols and various organic solvents can be used. In this case, a diluent compatible with the color-developing agent is selected. If necessary, various antifoaming agents such as silicone type can be added to the diluent.

An alkaline agent such as slaked lime may be used as a dissolving agent for the above-mentioned color developing agent, and an antifoaming agent may be mixed and used if necessary.

In addition, for example, select methyl cellulose as a color-developing agent,
When water is used as a diluent to prepare a 2% by weight aqueous solution,
The amount is preferably 50 to 80% by weight, especially 55 to 70% by weight. If the amount is less than 50% by weight, the paint has insufficient malleability, and there is a problem such as deterioration of adhesion when absorbing moisture.
If it exceeds the weight%, the amount of other materials becomes too small, which is not preferable.

As the antifungal agent, pentachlorophenol, sodium pentachlorophenol, parachlorometaxylenol, etc. are used, and the addition amount thereof is 0 relative to the total amount of the color-developing material, the diluent, the extender pigment, the fine perlite and the fine zeolite. 0.05 to 1.5% by weight, particularly 0.2 to 0.5% by weight is preferable.

Among the solid components of the paint, those having a polysaccharide as a main chain and sodium polyacrylate and polyacrylic acid as side chains are preferably used as the superabsorbent resin. This highly water-absorbent resin has the function of increasing the hygroscopicity of the paint. The blending amount of the super absorbent polymer is preferably 0.01 to 2.0% by weight, particularly 0.01 to 0.1% by weight. 0.
If the amount is less than 01% by weight, no effect is observed. If the amount is more than 2.0% by weight, the phenomenon that the super absorbent polymer expands due to moisture absorption appears as an adverse effect on the coating film, resulting in unevenness on the coating film. Damages the coating strength and aesthetics.

The total amount of hygroscopic fine perlite and fine zeolite is preferably 10 to 40% by weight, and more preferably 1
It is 1 to 20% by weight. If it is less than 10% by weight, the ability to absorb moisture is small and it is not economical, and if it exceeds 40% by weight, the coating is not easy and the workability is poor, and there is a possibility that the coating material may flow down when absorbing moisture. The mixing ratio of fine perlite and zeolite is 1.5: 1 to 5: 1, preferably 2 :.
1 to 3: 1. Fine powder perlite has a specific surface area of 2.5
It is preferable that m ² / g and the finely divided zeolite have a specific surface area of about 25 m ² / g.

In the present invention, first, a coating component containing the above-mentioned organic or inorganic color-developing agent, extender pigment, alkaline chemicals, diluent, and antifungal agent, and a powder or fibrous highly water-absorbent resin, hygroscopic fine powder perlite and A solid component containing finely divided zeolite is sufficiently uniformly added and mixed, and the obtained paste-like paint is evenly applied with a brush or a trowel to the construction surface to a thickness of, for example, about 1 to 5 mm. Then, a breathable wallpaper is attached to this painted surface.

In the present invention, as the breathable wallpaper, a film made of a synthetic resin film such as ordinary vinyl chloride having a size that does not spoil the appearance, for example, a film provided with a needle hole Examples include material meshes. The wallpaper can be easily pasted by painting the paint and then pressing it against the painted surface with a roll or the like. A known adhesive may be used to attach the wallpaper, if necessary.

Such a moisture-proof construction method of the present invention can be carried out on walls, floors, and ceiling surfaces of any material such as veneer, slate, calcium silicate, lightweight cement, gypsum, concrete, wood, and synthetic resin, and is extremely excellent. In addition to the effect of preventing the occurrence of dew condensation, a good appearance can be imparted.

[Operation] In the present invention, one of the points where the anti-condensation coating applied to the interior surface of a building is different from general coatings is that it contains a solid component containing a super absorbent polymer, fine pearlite and fine zeolite. To be there.

That is, since fine pearlite and fine zeolite have fine shells having a hollow shell structure, they have a breathing action and inhale moisture in the atmosphere, and release the inhaled moisture during drying. For this reason, when this paint is applied to a wall surface, etc., due to the breathing action of this paint, indoor moisture is absorbed in the paint film without causing dew condensation on the wall surface. There is almost no.

Further, by adding a small amount of the super absorbent resin, the above-mentioned moisture absorption effect is improved by, for example, about 20 to 50%, and dew condensation is more reliably prevented.

It should be noted that perlite alone has a large moisture absorbing / releasing property, and when it is made into a paint, the flowability, coating property, and workability of the paint deteriorate. On the other hand, if zeolite alone is used, the paint becomes hard and the suitability as a paint is poor. Perlite and zeolite are preferably mixed and used in the above-mentioned ratios to maintain a suitable moisture absorbing / releasing property and have a property suitable as a paint.

Methylcellulose used as a color-developing agent works effectively for improving the adhesiveness of the paint, and the sparingly soluble methylcellulose is dissolved by the addition of an alkaline agent.

By attaching a breathable wallpaper to the surface of such a wall surface anti-condensation paint, various colors and patterns can be easily applied without impairing the anti-condensation effect, and its aesthetic appearance is greatly enhanced. Can be improved.

EXAMPLES Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples unless it exceeds the gist.

Examples 1 and 2 and Comparative Example 1 The laboratory is divided into an indoor side and an outdoor side with a glass plate having a thickness of 2 mm, the indoor side is 25 ° C., the relative humidity is 80%, and the outdoor side is 0 ° C.
Set to.

In the above-mentioned laboratory, when the glass wall was untreated, dew condensation occurred on the surface on the indoor side within 1 minute, and the liquid droplets flowed down the glass surface.

Three veneer boards are installed on the glass wall inside the laboratory, and each of the veneer boards has methyl cellulose (2% solution) as a color-developing agent, calcium carbonate as an extender pigment, titanium oxide as a white pigment, and an alkaline agent. Slaked lime was used as the above, and three kinds of paints obtained by further mixing the defoaming agent, perlite, and zeolite in the ratios shown in Table 1
It was applied to a thickness of m. The finish of the coating film at this time was good, and the state of the coating film when exposed to the above test conditions was
It was as shown in the table.

When a vinyl chloride film with needle holes is attached to this coated surface and the condition of dew condensation is investigated, when exposed to the above test conditions, no dew condensation occurs on the surface even after 3 hours or more. The adhesive strength of the coating film was also good.
Table 1 shows the film surface and the state of adhesion when absorbing moisture.

Table 1 also shows the moisture absorption rate (percentage of water absorption at saturation divided by coating weight at dry). It is clear from Table 1 that the water absorption rate of the example is much higher than that of the comparative example. In Example 2, the superabsorbent resin was contained in a large amount, and foams were generated.
It has been determined that it is particularly suitable to incorporate less than wt%.

[Advantages of the Invention] As described above, according to the moisture-proof construction method of the present invention, new concrete buildings are of course available, and even existing concrete buildings for which no solution has been provided can be easily and favorably constructed at low cost. It is possible to prevent the occurrence of dew condensation. Of course, the method of the present invention can be applied to a wooden house.

However, it is possible to add arbitrary colors and patterns to the wallpaper, which is extremely excellent in terms of aesthetics.

Claims (4)

[Claims] 1. A paint component containing an organic or inorganic color-developing agent, an extender pigment, an alkaline chemical, a diluent, and a fungicide, and a powdery or fibrous superabsorbent resin on the interior surface of a building.
A moisture-proof construction method characterized by applying a wall surface dew condensation preventive paint comprising a solid component containing hygroscopic fine powder perlite and fine powder zeolite, and then applying a wallpaper having air permeability to the coated surface. 2. The moisture-proof construction method according to claim 1, wherein the total amount of the finely powdered perlite and the finely divided zeolite is 10 to 40% by weight. 3. The moisture-proof construction according to claim 1 or 2, wherein the mixing ratio of the finely powdered perlite and the finely powdered zeolite is within the range of 1.5: 1 to 5: 1. Law. 4. The content of the super absorbent resin is 0.01 to 2.0.
The moisture-proof construction method according to any one of claims 1 to 3, characterized in that the content is% by weight.