JPH0680450A - Subsidiary material for plasterer and moisture-controlling composition - Google Patents

Abstract

PURPOSE:To prevent dew-condensation phenomenon on the finished surface of a construction material such as concrete. CONSTITUTION:The objective moisture-controlling composition is a mixture of 40-70 pts.wt. of a subsidiary material for plasterer produced by forming mineral fibers in the form of fluffy granules having an outer diameter of about 1-10mm, 35-55 pts.wt. of Portland cement and 15-30 pts.wt. of dolomite plaster. A troweling material or a spraying material can be prepared simply by applying water, etc., to the mixture. The surface finished with the composition is free from dew-condensation phenomenon because the surface layer contains the fluffy granules of mineral fibers having moisture-absorbing and releasing function in dispersed and properly bonded state. Since all the components are inorganic materials, the composition has excellent corrosion resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastering auxiliary material and a humidity control composition using the plastering auxiliary material.

[0002]

2. Description of the Related Art In order to prevent dew condensation on the inner wall of a building, the bottom surface of a slab, the ceiling surface, etc., a dew condensation calculation is performed in advance, and then a thick heat insulating layer and a moisture impermeability layer are used for construction. However, the actual situation is that many dew condensation accidents actually occur due to differences between the set conditions and practical use, construction defects, and the like. There is also a method of preventing the dew condensation phenomenon by absorbing and releasing dew condensation water in the building finishing material itself, instead of the above-mentioned technique, but as a building material having such a function conventionally, for example, wood typified by paulownia or the like, or diatomaceous earth. There was a plastering finish made mainly of.

[0003]

However, since wood suffers from problems such as decay and discoloration, it is difficult to endure it, and it is also not preferable from the standpoint of protecting the global environment, which has been recently discussed.

On the other hand, a material mainly composed of diatomaceous earth can be expected to have a considerable effect on the absorption of water, but on the other hand, it becomes brittle and has a problem in terms of durability and strength.

The present invention has been made in view of the above problems, and provides a new plastering material for plastering and a humidity control composition using the plastering material, which has the above-mentioned problems. The purpose is to solve the problem.

[0006]

To achieve the above object, the present invention is characterized in that, as claim 1, first, mineral fibers (for example, rock wool etc.) are molded into pill-shaped particles having an outer diameter of about 1 to 10 mm. Providing plastering auxiliary materials.

Further, in claim 2, a humidity control composition using the above-mentioned plastering auxiliary material is provided. That is, 40 to 70 parts by weight of a plastering auxiliary material obtained by molding mineral fibers such as rock wool into pill-shaped particles having an outer diameter of about 1 to 10 mm, and 3 parts of Portland cement.
A humidity control composition, which is substantially composed of a mixture of 5 to 55 parts by weight and dolomite plaster of 15 to 30 parts by weight.

[0008]

According to the first aspect of the present invention, since the mineral fibers are formed into pill-shaped particles, a thin continuous gap is formed in the mineral fibers, and this gap exhibits a capillary phenomenon. As a result, it has water absorption, water retention, and water discharge like absorbent paper.

When it is used as a building finishing material, it is mixed with Portland cement and dolomite plaster, for example. In this case, since the mineral fibers are formed into pill-shaped particles having an outer diameter of about 1 to 10 mm,
It has the property of being easily mixed with these materials, and is dispersed and appropriately bonded in the composition thus produced. Therefore, for example, when water or an adhesive reinforcing material is added to the composition thus prepared and applied to the wall surface, the pill-shaped mineral fibers are present in an appropriately bonded state, and these pill-shaped mineral fibers are present. Since the dew condensation water generated near the surface of the structure is absorbed, dew condensation does not occur on the finished surface of the structure even under dew condensation conditions.

In this case, if the outer diameter of the pill-like particles is larger than the above range, the voids are too large and the water absorbing / releasing function is deteriorated. On the contrary, if it is smaller than the above range, the water absorbing function and the water retaining function itself are insufficient. Becomes Therefore, the outer diameter of the pill-like particles made of mineral fibers is preferably about 1 to 10 mm, but among them, those having an outer diameter of about 3 to 5 mm are well-balanced and suitable for practical use.

Further, once the water is absorbed by the capillary phenomenon, the absorbed water does not seep out to the surface because of the water retaining property. Then, when the environmental conditions of the atmosphere change such as temperature rise, the water retained inside is released into the atmosphere. In addition, since mineral fibers are inorganic, they have excellent corrosion resistance and fire resistance, and also have heat insulating properties.

According to the second aspect, the addition of water or the like makes the plastering material easy. And, since the auxiliary material for plastering of claim 1 is dispersed in the structure finished by using this, the so-called humidity control action of claim 1 is exhibited, and the dew condensation phenomenon on the surface of the structure is prevented. It Further, since the raw materials are all inorganic, they are excellent in corrosion resistance, and there is no problem in durability and strength even if moisture absorption and release as described above are repeated. It also has excellent fire resistance, heat insulation, and sound absorption.

[0013]

EXAMPLE An example of the present invention will be described below with reference to the drawings. The composition ratio (weight ratio) of the raw materials in this example is as follows. Rock wool 44.75% Holtland cement 41.50% Dolomite plaster 13.50% Methylcellulose to further improve workability and water retention
For example, 0.25% (weight ratio) of the trade name "Metroze" was added. Then, the operation and effect of the embodiment having the above configuration will be confirmed by the following experiments.

First, as shown in FIG. 1, the test piece used in the experiment was a heat insulating mold 1 made of expanded polystyrene heat insulating material (styrofoam GK board) having a thickness T = 50 mm.
A PC concrete board 2 having a thickness of T = 30 mm was embedded, and the product name "Band-Bond (styrene-butadiene-latex)" was further added as an adhesive reinforcing material to the above-mentioned example, and water was further added and mixed. 3 from the top
It consists of sample 3 which was ironed with a thickness of 0 mm.
At this time, the compounding ratio of "Band-Bond" and water is 12% with respect to the above-mentioned raw material, and 75% of water with respect to the above-mentioned raw material + "Band-Bond" (both by weight).

Then, this sample was placed in a chamber (not shown) in which the temperature and humidity could be changed freely, and changes in temperature and humidity of the sample when the environmental conditions were changed were measured. For the measurement, the sensor 4 was installed on the surface shallow part of the sample 3, and the sensor 5 was installed at the boundary between the sample 3 and the PC concrete board 2, and the measured values were set as "front" and "back", respectively. It was shown to.

(Experiment 1): When the environmental conditions were set so that the surface of the test piece became a dew condensation condition (when the temperature of the test piece was lower than the dew point temperature), as shown in FIGS. Temperature and relative humidity are 8.0 ° C and relative humidity 75%, respectively →
The temperature, relative humidity and absolute humidity before and after the sample 3 were measured by the sensors 4 and 5 while changing the temperature to 33.0 ° C. and the relative humidity to 55%.

As a result, first of all, no dew condensation was observed on the surface of the sample 3 during the experiment. The changes over time in the temperature, relative humidity, and absolute humidity before and after the chamber and sample 3 were as shown in FIGS. 5 to 7. From these results, the humidity of the surface portion of the sample 3 instantly increased because the sample 3 was in the chamber under the dew condensation condition, but it was immediately sucked into the back and therefore the surface did not dew. You can confirm that. In addition, the dew condensation condition part of the sample 3 is gradually moving to the back due to the influence of temperature and humidity from the outside. After that, as the temperature of the PC concrete plate 2 side becomes similar to the temperature in the chamber, water is released from the inside of the sample 3 in an attempt to equilibrate the amount of water vapor in the sample 3 and the atmosphere, and as a result, relative humidity and absolute humidity are released. It can be confirmed that

However, in Experiment 1 described above, the absolute humidity in the atmosphere is raised in order to reproduce the dew condensation condition, so the above results also include the amount of increase in the absolute humidity in the atmosphere. Therefore, it is difficult to examine when confirming only the moisture absorption effect of the sample 3, especially the water vapor absorption effect. Therefore, in Experiment 2, the temperature and humidity were changed while keeping the absolute humidity constant.

(Experiment 2): When absolute humidity in the atmosphere is constant and temperature / humidity changes, as shown in FIG. 8 to FIG.
Relative humidity is 15.0 ° C and relative humidity is 80%
→ The temperature was changed to 31.2 ° C. and the relative humidity was 30%, and the temperature, relative humidity and absolute humidity before and after the sample 3 were measured by the sensors 4 and 5.

As a result, as shown in FIGS. 11 to 13, it was confirmed that the relationship between the temperature change and the humidity change and the elapsed time followed the same trajectory as the result of the experiment 1. From this, it can be confirmed that the sample 3 has a water vapor absorbing action even under an environmental condition that does not include the dew condensation condition.

Further, in order to confirm the reproducibility of the above-mentioned absorbing and releasing action of the sample 3, the following experiment 3 was conducted. (Experiment 3): In the case where the absolute humidity in the atmosphere is constant and the same condition as the environment setting of Experiment 2 is repeated, as shown in FIGS. 14 to 16, the temperature in the chamber and the relative humidity are set to the temperature 13 0.0 ° C, relative humidity 75
% → Temperature is changed to 31.0 ° C and relative humidity is 25%, and this is repeated three times, and the temperature, relative humidity and absolute humidity before and after the sample 3 are measured by the sensors 4 and 5. .

The experimental results are shown in FIGS. 17 to 19. That is, in this experiment, the same environment setting was repeated three times, but as can be seen from the graphs shown in FIGS. 17 to 19, the result of one time follows the same locus as the results of experiment 1 and experiment 2. There is. Moreover, the results of the repeated three times both show loci of similar shapes. Therefore, even if the environment is repeatedly changed, the internal humidity (moisture) remains in the sample 3.
It can be seen that the humidity control ability, that is, the water absorption and release functions, is not lost since the release effect is observed.

As can be seen from the above experimental results of Experiments 1 to 3, the present invention can be applied even under the condition that the temperature of the structure is lower than the dew point temperature of the indoor air, that is, the surface is assumed to be in a dew condensation state. Condensation phenomenon does not occur on the finished surface of the structure finished with. Also, when the temperature of the atmosphere and the temperature of the structure such as the wall have reached equilibrium, the moisture retained in the auxiliary material for plastering in the humidity control composition is released to the outside, so that the structure finishes again. Even when the surface is subject to dew condensation, a good humidity control action is exhibited, and the dew condensation phenomenon on the surface is prevented.

In the case of appropriate coloring, it is preferable to use an inorganic substance having an alkali resistance, which does not significantly change its color when exposed to direct sunlight and which does not rust the metal when dissolved in water.

To form a molded building material such as a plate material, SBR (styrene / butadiene / latex) or the like may be added in addition to the raw materials listed in the above embodiment, for example, in an amount of 0.25 to 0.5 part by weight.

[0026]

According to the first aspect of the present invention, as in the second aspect, it can be mixed with a joining material such as Portland cement and used as a trowel coating material or a spraying material. Has a humidity control function and prevents dew condensation. In addition, since the mineral fiber is formed into a pill-shaped particle having an outer diameter of about 1 to 10 mm, it has a property that it is easily mixed with other materials as described above, and moreover, it is easily dispersed in the composition thus produced. In addition, since mineral fibers are inorganic, they are excellent in corrosion resistance and fire resistance, and also have sound absorbing properties and heat insulating properties.

According to claim 2, just by adding water or the like,
As the iron coating material, spray material as it is, and the structure finished in that way, as can be confirmed from the experimental results described above, the temperature of the structure is lower than the dew point temperature of the indoor air, that is, No dew condensation occurs on the surface even under conditions that are normally assumed to be dew condensation on the surface.

Moreover, when the temperature of the atmosphere and the temperature of the structure such as concrete reach equilibrium, the water retained in the auxiliary material for plastering in the humidity control composition is released to the outside, so that the structure is re-established. Even when the body surface is subject to dew condensation, it exerts a good humidity control effect and prevents the surface dew condensation phenomenon.

Furthermore, since the raw materials are all inorganic, no problems such as corrosion occur and the durability is excellent. It is also excellent in strength, fire resistance, soundproofing, and workability.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory diagram of a test piece used in an experiment of an example.

FIG. 2 is a graph showing setting of temperature conditions in Experiment 1 of Example.

FIG. 3 is a graph showing setting of relative humidity conditions in Experiment 1 of Example.

FIG. 4 is a graph showing setting of absolute humidity conditions in Experiment 1 of an example.

FIG. 5 is a graph showing the experimental results regarding the relationship between the elapsed time and the temperature obtained in Experiment 1 of the example.

FIG. 6 is a graph showing the experimental results regarding the relationship between the elapsed time and the relative humidity obtained in Experiment 1 of the example.

FIG. 7 is a graph showing the experimental results regarding the relationship between the elapsed time and the absolute humidity obtained in Experiment 1 of the example.

FIG. 8 is a graph showing setting of temperature conditions in Experiment 2 of Example.

FIG. 9 is a graph showing setting of relative humidity conditions in Experiment 2 of Example.

FIG. 10 is a graph showing setting of absolute humidity conditions in Experiment 2 of the example.

FIG. 11 is a graph showing the experimental results regarding the relationship between the elapsed time and the temperature obtained in Experiment 2 of the example.

FIG. 12 is a graph showing the experimental results regarding the relationship between the elapsed time and the relative humidity obtained in Experiment 2 of the example.

FIG. 13 is a graph showing the experimental results on the relationship between the elapsed time and the absolute humidity obtained in Experiment 2 of the example.

FIG. 14 is a graph showing setting of temperature conditions in Experiment 3 of Example.

FIG. 15 is a graph showing setting of relative humidity conditions in Experiment 3 of Example.

FIG. 16 is a graph showing setting of absolute humidity conditions in Experiment 3 of Example.

FIG. 17 is a graph showing the experimental results regarding the relationship between the elapsed time and the temperature, which was obtained in Experiment 3 of the example.

FIG. 18 is a graph showing the experimental results regarding the relationship between the elapsed time and the relative humidity obtained in Experiment 3 of the example.

FIG. 19 is a graph showing the experimental results regarding the relationship between the elapsed time and the absolute humidity obtained in Experiment 3 of the example.

[Explanation of symbols]

 1 Insulation Form 2 PC Concrete 3 Sample 4 Sensor 5 Sensor

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Claims (2)

[Claims] 1. An auxiliary material for plasterers, characterized in that mineral fibers are molded into pill-shaped particles having an outer diameter of about 1 to 10 mm. 2. A humidity control composition having the following mixing ratio.・ 40-70 parts by weight of plastering auxiliary material formed by molding mineral fibers into pill-shaped particles with an outer diameter of about 1-10 mm ・ 35-55 parts by weight of Portland cement ・ 15-30 parts by weight of dolomite plaster