JPS6350382B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a paint for preventing dew condensation on walls, and the present invention relates to a paint for preventing dew condensation on walls. This invention relates to a paste-like wall surface dew condensation prevention paint for preventing dew condensation caused by condensation of excess moisture on a wall surface. [Conventional technology] Conventionally, to prevent condensation on the walls of buildings, insulation materials such as glass wool, rock wool, or foamed synthetic resin boards are inserted between the exterior and interior walls to improve insulation and prevent condensation. There are known technologies to prevent condensation, and in the case of new concrete building structures, a foamed synthetic resin board is attached to the inner surface of the formwork during concrete pouring, and concrete is poured into the formwork to prevent condensation through a structure that integrates the concrete and insulation material. Furthermore, in order to prevent moisture from entering the concrete itself, there are measures such as adding and mixing a water repellent such as stearic acid salt and pouring it. There are no known improvement techniques for preventing dew condensation in existing concrete buildings. [Problems to be Solved by the Invention] As described above, as a measure to prevent condensation on indoor walls, by inserting a heat insulating material between the outer wall and the inner wall, the temperature of the indoor wall surface decreases and the occurrence of condensation is prevented. Although this technique is more effective than not using any insulation at all, it is not a perfect solution. In other words, although the occurrence of condensation on the inner wall surface is reduced, there is a space layer between the outer wall and the insulation material, and although there is no condensation on the inner wall surface, there is a space layer between the outer wall and the insulation material. Condensation is occurring. The reason for this is thought to be that 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 problem, it is necessary to bond the wall surface and the insulation material closely and to increase the thickness of the insulation layer, which not only imposes structural constraints but also becomes economically expensive. Become. In addition, in the case of concrete buildings, it has recently been proposed to add and mix water repellent materials such as steria phosphate, but there are problems with the chemical stability of the water repellent agents themselves, such as steria phosphate. Not put into practical use. In view of these circumstances, the inventors of the present invention conducted extensive research into developing an inexpensive and effective anti-condensation material, and as a result, developed a new paste-like paint. The present invention provides a wall surface dew condensation prevention paint that is effective in preventing dew condensation when applied to a wall surface. [Means for Solving the Problems] The gist of the present invention is to provide a paint composed of an organic or inorganic color vehicle, an extender, a diluent, an alkaline chemical, a pigment, and a fungicide; This is a paint for preventing dew condensation on walls, which is characterized by being made of a mixture of finely powdered perlite and finely powdered zeolite. It is effective to set the amount of the fine pearlite and zeolite to be in the range of 15 to 40% by weight, and the mixing ratio of the fine pearlite and zeolite to be in the range of 2:1 to 4:1. Examples of organic or inorganic color vehicles include milk casein, soybean casein, glue, gelatin, fluff, wheat flour, methyl cellulose, vinyl acetate powder, other water-soluble synthetic resins, sodium silicate, potassium silicate, and other known color vehicles. Any material selected from among them may be used, among which methylcellulose is preferable. Select methylcellulose as the coloring material, and use 2% methylcellulose and water as the diluent.
% by weight aqueous solution, the amount being in the range 55-80% by weight, preferably 60-70% by weight. 55% by weight
If it is less than 80% by weight, there will be problems such as insufficient paint spreadability and deterioration of adhesion upon moisture absorption, and if it exceeds 80% by weight, the amount of other materials will be too small, which is not preferable. Extender pigments include chalk, heavy calcium carbonate, light calcium carbonate, dung, barite powder,
Clay et al. The total amount of hygroscopic fine pearlite and fine zeolite is preferably 40 to 15% by weight, more preferably 20 to 15% by weight. If it is less than 15% by weight, the ability to absorb moisture is low and it is not economical, and if it exceeds 40% by weight, it will not be easy to paint, resulting in poor workability, and there is a risk that the paint will run down when absorbing moisture. The mixing ratio of fine pearlite and zeolite is 2:1 to 4:1, preferably 2:1 to 3:1. It is preferable that the fine powder pearlite has a specific surface area of 2.5 m ² /g, and the fine powder zeolite has a specific surface area of about 25 m ² /g. Pentichlorophenol, sodium pentachlorophenol, parachloromethaxylenol, etc. are used as fungicides, and the amount added is 0.05 to 0.05 to the total amount of coloring material, diluent, extender pigment, fine perlite, and fine zeolite. 1.5% by weight
and 0.3% by weight is most preferred. An alkaline agent is used as a dissolving agent for the coloring material, e.g.
Slaked lime is used, and if necessary, an antifoaming agent is mixed. [Function] Condensation is prevented by uniformly applying the paste paint obtained by adding and mixing the above materials uniformly to the inner wall surface with a brush or trowel to a thickness of about 1 to 5 mm. be done. The dew condensation prevention paint of the present invention is particularly different from general paints in that it contains fine pearlite and fine zeolite, and since the fine pearlite and fine zeolite have a shell structure with micropores, It has a respiratory effect, inhaling moisture from the atmosphere and releasing the inhaled moisture when dry. When this paint is applied to an interior wall surface, due to the breathing effect of this paint, indoor moisture is absorbed into the paint film without forming dew condensation on the wall surface. Single pearlite has a high moisture absorbing and releasing property, and when it is made into a paint, the fluidity, coating properties, and workability of the paint are poor. On the other hand, if zeolite is used alone, the paint becomes hard and is less suitable as a paint. By using a mixture of pearlite and zeolite in the above ratio, suitable moisture absorbing and releasing properties are maintained and properties suitable as a paint are maintained. Methylcellulose, which is used as a color vehicle, works effectively to improve the adhesion of paints, and methylcellulose, which is sparingly soluble, can be dissolved by adding an alkali agent. Next, the present invention will be explained in more detail with reference to examples, but the present invention is not limited to these examples. [Example] A laboratory was divided into an indoor side and an outdoor side by a 2 mm thick glass plate, and the indoor side was set at 25°C and the relative humidity was 80%, and the outdoor side was set at 0°C. In the above laboratory, when the glass walls were untreated, condensation occurred on the indoor surface within one minute, and droplets flowed down the glass surface. On the other hand, methyl cellulose (2%
An experiment was conducted using calcium carbonate as an extender pigment, titanium oxide as a white pigment, slaked lime as an alkali agent, and adding an antifoaming agent, perlite, and zeolite. Three types of Example paints prepared by mixing the above-mentioned raw materials in the ratios shown in Table 1 were applied to the indoor side of a glass plate to a thickness of 1 mm. The condition of the coating film after application was also good; no dew condensation occurred even after 3 hours or more when exposed to the above test conditions, and the adhesion strength of the coating film was also good.

〔Effect of the invention〕

The paint for preventing condensation on wall surfaces of the present invention can prevent dew condensation not only in newly constructed concrete buildings but also in existing concrete buildings for which no solution has been available by simply applying the paint to the interior walls of the building. It also has the same effect on wooden houses and can be used as a general paint. It is inexpensive and has good workability.

Claims (1)

[Claims] 1 Consists of a mixture of a paint consisting of an organic or inorganic color vehicle, an extender pigment, an alkaline chemical, a diluent, a pigment, and a fungicide, and a hygroscopic fine powder perlite and a fine powder zeolite. The amount added is 15~
A paint for preventing dew condensation on a wall surface, characterized in that the mixing ratio of fine pearlite and fine zeolite is within the range of 40% by weight and within the range of 2:1 to 4:1.