JPS60109443A - Panel with moisture absorption and desorption properties - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a panel having moisture absorbing and releasing properties that can be used for humidity control and dew condensation prevention in the interior of a building, etc.

In recent years, houses have become more airtight, with more and more buildings having aluminum sash in their windows and partition walls. Furthermore, as non-breathable vinyl cloth is often used for interior finishing materials, the indoor humidity environment worsens, leading to dry noses, condensation, and mold. The damage has begun to appear.

In addition, conventional methods have been used to improve the indoor environment and prevent condensation by using insulation materials, but they have no effect on controlling indoor humidity, and the absolute humidity in the room still increases to compensate for the prevention of condensation. There was a problem that it would increase by 1. On the other hand, a paint that forms fine pores was applied to the indoor surface, and the condensed water that was generated was absorbed into the pores, apparently preventing dew condensation on the surface.
It also had a humidity control function that improved the indoor humidity environment by releasing moisture when it was dry. However, it was not always possible to obtain the above-mentioned effects with just a thin layer of paint, and the humidity environment is correlated with temperature, and the temperature difference between indoors and outdoors is too large. However, it was impossible to obtain such an effect. Furthermore, the above-mentioned paints have fine pores and therefore have a rough surface, and stains such as hand grime tend to adhere to them, so they are not aesthetically pleasing.

The present invention eliminates the deficiencies of the conventional methods described above. The structure of the present invention includes a heat insulating base material 1, PVC6
Coating layer 2 of 0% or more, moisture permeation resistance 2 n
It is characterized by being made of a surface-based paper 3 having a resistance of less than l-h-Hg/g.

As the heat insulating base material, foamed polyurethane, foamed polystyrene, foamed polyethylene, hard fiberboard, soft fiberboard,
Foamed glass, calcium silicate plates, foamed mortar, and the like can be suitably used, but those that are flexible and do not have a smooth surface, such as glassware, are not suitable because the coating layer described below cannot be formed.

Next, the coating layer containing 60% or more of PVC will be explained. What is PVC or pigment volume concentration?
Pigments contained in the total volume of the solid content volume of coating film forming elements such as synthetic resins and synthetic resin emulsions in coating materials, and pigments such as titanium oxide, clay, calcium acetate, and diatoms. It means the volume percentage of . When the volume concentration of this pigment is 60% or less, fine pores are not generated in the coating layer.

This is thought to be due to the formation of a continuous layer of film-forming elements, but if the PVC content is 60% or more, the film-forming elements become discontinuous and fine pores are generated in the coating layer. , the coating layer has the ability to absorb and release moisture. In addition, as a method for forming a coating layer with PVC of 60% or more on the entire heat-insulating base material, the coating material of the paint is mixed in advance so that the PvC is 60% or more.
The heat insulating base 1'1 is coated using a coating means such as a spray, a doctor knife, a roll coater, or a curtain flow coke, and further, before the coating material dries, a surface base paper 3, which will be described later, is laminated. and then drying.

In addition, as mentioned above, moisture permeability resistance 2 nl −h −mmHg/g
Examples of the following surface-based papers include synthetic papers such as polyurethane, polynutylene, rayon, tetron, and nylon, nonwoven fabrics, fabrics, natural papers such as cellulose paper, and natural fiber fabrics.

The moisture permeability resistance of the surface-based paper is 2yl −h −m
yHg/g or more, moisture cannot transfer to the coating layer 2, and the moisture absorption and release properties of the panel in the present invention are significantly reduced. By providing the surface base paper, it is possible to prevent the adhesion of stains due to hand marks, etc., without impairing the moisture absorption and desorption function of the coating layer 2, and it is also possible to perform printing etc. on the surface base paper. In terms of design, one of the major features of the present invention is that it can provide patterns, colors, etc. that cannot be achieved with coating materials alone.

The moisture absorbing and releasing panel of the present invention exhibits an excellent effect on controlling humidity and preventing dew condensation in a building room, and has excellent design and workability, and can also solve the problem of stains such as hand marks.

Examples of the present invention will be described below.

Example 1 As a heat insulating base material, foamed polyethylene (trade name = "Nutairo Foam" manufactured by Dow Kako Co., Ltd.) 20 thickness, 900 x 900
For ffl+, after adjusting the coating material with the following composition and coating it with air spray, the moisture permeability resistance was 0.277? - After laminating a nonwoven fabric made of hytnHg/g with a floral pattern printed on it as a surface base paper, Example 1 was obtained by drying at 40°C for 2 hours. This Example 1 was used as a test panel for an experiment. The results are shown in Figure 2 below.

Comparative Example 1 A test panel was prepared in the same manner as in Example 1, except that the amount of calcium carbonate in the coating material in Example 1 was adjusted to 50% PVO, and was subjected to an experiment. The results will be described later.

Comparative Example 2゜ Moisture permeability resistance 20m-h・πm as the surface base paper in Example 1
A test spring (v) was similarly prepared by replacing it with a polyethylene sheet of Hg/g and subjected to an experiment. The results are shown in FIG.

Humidity control performance test method: Make a box made of iron plate with dimensions of 900 x 900 x 900 mm and a thickness of 1.6 mm, and while keeping the inside of the box at a constant temperature of 20°C, adjust the humidity using a humidifier to match the standard humidity curve. adjust. This box shall be left in an environmental chamber maintained at 5°C. Next, the test spring /l/ was attached to the inner wall of the box.
4 with adhesive, operate the humidifier in the same way as when obtaining the reference humidity curve, and measure the humidity inside the box.

results of the experiment It was as shown in Figure 2.

During the experiment described in "Evaluation of Condensation", no dew condensation was observed in Example 1, but dew condensation occurred in Comparative Examples 1 and 2.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of a panel having moisture absorption and desorption properties according to the present invention. FIG. 2 is a graph showing the elapsed time and relative temperature when the Examples and Comparative Examples of the present invention were subjected to a humidity control performance test. 1...Insulating base material, 2...Coating layer, 3...Surface base paper, 4...Moisture absorbing and desorbing panel material... Reference humidity curve, mouth...
...Example 1, c...Comparative example 1 and comparative example 2 Patent applicant Akio Toyama, representative of Kikusui Chemical Co., Ltd.

Claims (1)

[Claims] Heat insulating base material 1, coating layer 2 with a pigment volume concentration (hereinafter referred to as PVC) of 60 percent or more, moisture permeation resistance 2 m'-
A panel having moisture absorbing and desorbing properties characterized by being made of a surface-based paper 3 having a moisture absorbing and releasing property of less than h - mgHg/g.