JPH06136840A - Method of preventing condensation of internal wall of building by using ultrafine powder and resin excellent in steam permeability - Google Patents

Abstract

PURPOSE:To make it possible to prevent condensation by granulating organic and inorganic ultrafine powder by using resin aqueous solution excellent in steam permeability as binder, and using the binder to apply it to the indoor wall. CONSTITUTION:Resin aqueous solution excellent in gas permeability such as polyvinyl alcohol, etc., specilally in steam permeability and emulsion are mixed with organic and inorganic ultrafine powder having large specific area of calcium carbonate, amorphous silica and others. After that, it is granulated by a compression granulator, a rolling granulator, a fluid bed granulator, etc. Then, it is used as aggregate, and after it is mixed with vinyl acetate emulsion, protective colloid agent, dispersing agent, thickener, defoaming agent, preservatives, water, etc., it is applied to an indoor wall. According to the constitution, moisture absorption, water absorbing efficiency, moisture-proof and water-proof efficiency are excellent, so that the indoor wall can absorb moisture as well as a mud wall and, at the same time, the generation of mildew can be minimized.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Prevention of condensation on the inner wall of buildings

[0002]

2. Description of the Related Art In recent years, the indoor airtightness of Japanese buildings has increased, causing dew condensation on the inner walls of the winter season, which is a health problem. As a countermeasure against this, dehumidifying substances such as calcium chloride are used to remove moisture from only certain parts of the room such as the closet.

[0003]

A method of absorbing water vapor generated indoors as quickly as possible to reduce the humidity to the level at which a person feels most comfortable, and replenishing necessary moisture when drying.

[0004]

[Means Before Solving the Problem] A substance that is more porous and has better hygroscopicity and desorption than a natural product should be used as a fine powder substance with a large specific surface area and a resin that has good hygroscopicity, moisture release, water vapor, and permeability. After granulating with an aqueous solution or emulsion as a binder, it is dried. For preventing dew condensation, water is applied to the granules when the granules are applied to the inner wall of the room, and then the granules are mixed with a synthetic resin emulsion or the like and applied.

[0005]

[Operation] The above-mentioned granules have greater moisture absorption and desorption performance under the same conditions than natural adsorbents such as pearlite and zeolite, and also have a high water absorption and desorption performance. It is good.

[0006]

[Implementation example specific surface area was mixed carbonate Improvement of a Saline of about ^{10 m} 2 / g to form a uniform amorphous or amorphous silica 50 parts by weight of about 50 parts by weight 180~210m ² / g, it After rolling granulation with 60 parts by weight of a 5% aqueous solution of polyvinyl or alcohol (saponification degree of 1.6 or more) having good water vapor permeability, it is dried. Using a vibrating screen, coarse particles of 35 mesh or more are removed to obtain an aggregate.

A commercially available vinyl acetate emulsion (nonvolatile content: about 50%) is added to this aggregate as a colloid agent, a dispersant, a thickener,
An antifoaming agent, an antiseptic agent, water, and the like were mixed and adjusted, and the mixture was applied to an aluminum plate having a length × width of 300 mm × 300 mm and a thickness of 1 mm to have a thickness of 2 mm. A characteristic test was performed on this test piece at the Japan Building Materials Center according to the following procedure.

As shown in FIG. 1, the test apparatus comprises a thermostatic box in which the temperature and humidity can be arbitrarily set, an electronic balance and a cooling pal installed inside the box. The test body is hung on the front side of the cooling panel in a free state with one side dehumidified by the aluminum plate as the cooling side, and the weight change due to moisture absorption and desorption can be measured by the electronic balance. The temperature was measured using a CC thermocouple having a diameter of 0.2 mm, and the humidity was measured with a digital multipoint recording device using an electric resistance type hygrometer and an Asman electric ventilation type wet and dry bulb hygrometer.

[0009]

[Test conditions and measurement method] Figure 2 outlines the test conditions. After keeping the temperature and humidity inside the constant temperature box and the temperature of the cooling panel constant, and after the test body is in a state of equilibrium with the atmosphere (curing), rapidly humidify the inside of the constant temperature box to make a step change and measure the weight change of the test body. (Hygroscopic process) From the humidified state, the inside of the constant temperature box was rapidly dehumidified to return to the initial state and the weight change was measured (moisture releasing process). The test was performed three times under the same set conditions, where the moisture absorption process was continued for 3 hours and when it was continued for 8 hours and 18 hours. Further, the property of dew condensation on the surface of the test body was also observed at appropriate times.

[0010]

[Test Results] The results of moisture absorption and desorption characteristics test are shown in Figures 3 to 5. When the temperature of the test piece surface is about 16.4 ° C (dew point temperature when the temperature is 20 ° C and relative humidity is 80%), 3 hours 10
It absorbs 51 g per 1 m ^{2 in} the moisture absorption process of 1 minute and is 1 in 8 hours.
The 06g / ^{m 2,} and moisture absorption of 250 g / ^{m 2} in 18 hours. In the moisture releasing process, the moisture absorption rate increases as the moisture absorption amount of the test body increases, and moisture is released in a relatively short time until the moisture absorption amount reaches about 20 g / m ² . The observation results of surface dew condensation are shown in Table-1. No surface dew condensation was observed up to 16 hours after the moisture absorption process (moisture absorption amount of 228 g / m ² ).

[0011]

[Results of the Invention] As shown in the results of the Examples, 10 in 8 hours.
Absorbing 6 g / m ² means that the wall surface of a room of 10 m ² is 20 m ² or more on average, and the amount of moisture absorption on all the wall surfaces is 2,120 g. Therefore, the humidity that enters the closet etc. is generated in the entire room. Moisture is pushed into the wall for the entire wall, and the moisture is dispersed and adsorbed, which reduces the generation of mold.

[Brief description of drawings]

[Figure 1] Overview of test equipment

[Figure 2] Conceptual diagram of test conditions

[Figure 3] Moisture absorption and desorption characteristics test results (1)

[Figure 4] Moisture absorption and desorption characteristics test results (2)

[Figure 5] Moisture absorption and desorption characteristics test results (3)

[Short description of table]

[Table 1] Observation result of surface dew condensation

Claims (1)

[Claims] 1. An organic or inorganic ultrafine powder having a large specific surface area, such as an ester or ether derivative of cellulose or polyvinyl alcohol, etc., so that capillary action between the ultrafine powders is developed. Use an aqueous solution or emulsion of resin with good gas permeability, especially water vapor permeability, granulate with a compression granulator, tumbling granulator, fluidized bed granulator, etc. How to apply and prevent dew condensation