JPH0819398B2 - Anti-condensation agent - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical which prevents the occurrence of dew condensation by applying it to the dew condensation generation site in advance.

[0002]

2. Description of the Related Art In order to prevent dew condensation on a wall or a pillar of a building, a material having a high heat insulating property is used as a building material such as a panel or a wall material, or a material having a low thermal conductivity between an outer wall and an inner wall. For example, by filling with a fibrous material, the transfer of heat from the low temperature part to the high temperature and high humidity part is prevented or suppressed, or dry air is blown to the dew condensation surface. In addition, in recent years, a method of absorbing the generated dew condensation by mixing the highly water-absorbent resin with the coating material to form a dew condensation prevention coating, and applying it to the dew condensation location has been devised, and it is likely to occur at the dew condensation location. For the prevention of mold, methods such as application of an antifungal agent or antifungal paint, attachment of a panel or wallpaper containing an antifungal agent, and sticking have been used.

[0003]

As described above, as described above,
In order to prevent the occurrence of dew condensation and mold at the places where they are expected to occur, it was necessary to select construction materials that would require high material costs and construction costs, and to take construction measures. In fact, if there is no condensation or mold, these costs are completely wasted. However, if you do not take preventive measures in advance and try to take these measures after the fact. It is self-evident that it will cost more money. In this respect, the anti-condensation paint containing the highly water-absorbent resin,
It is simple, the construction cost is low, and the post-measures are easy, but
When there is a large amount of dew condensation, it is impossible to deal with these problems with a conventional one that is a simple compounding product. That is, since the conventional anti-condensation paint absorbs moisture and dew condensation properly, when the humidity is high or the amount of dew condensation is large,
Due to the water absorbed by the coating film, it swells significantly in a short time and reaches the water absorption limit, and the dew condensation prevention ability decreases significantly, or the excessive swelling significantly impairs the strength of the coating film and causes problems such as peeling of the coating film. It was easy. As a mildew proof measure, a method such as topically applying a mildew proofing agent or premixing it in the paint can be used. Was not easy to select because it causes problems such as deterioration of water absorption performance of the coating film, discoloration, unpleasant odor or generation of harmful gas. The present invention is intended to provide a special anti-condensation agent that can solve the above-mentioned various problems all at once by simply applying it thinly on the dew condensation-occurring portion.

[0004]

The present invention is directed to a highly water-absorbent resin, an acrylic synthetic resin emulsion, a vinyl acetate synthetic resin emulsion, or a copolymer emulsion of these two systems, a fluorine synthetic resin emulsion, or a silicone system. A dew condensation preventive agent characterized by containing a synthetic resin emulsion as a main component, and an antibacterial agent added to the main component to enhance the antifungal effect. A white paste-like paste prepared by dispersing and mixing these in water. Used as a substance. Superabsorbent resins include starch-based (modified PVA-grafted starch, Sanyo Kasei Co., Ltd., trade name Sunwet), carboxymethylcellulose-based (Daicel, trade name JELLFINE), polyacrylic acid-based (Sanyo Kasei Co., Ltd., Sunfresh ST-500MPS, Poval type (Sumitomo Chemical,
Various products are known, such as the trade name Sumika gel) and their copolymerization systems. As the super absorbent resin used in the present invention, those having a high water absorption rate among them, those having a high absorption rate are preferable, and the particles have a drawback that they tend to become mama during production, but finer ones. Is excellent in terms of coating strength, gloss, and dew condensation prevention performance. Acrylic synthetic resin emulsion, vinyl acetate synthetic resin emulsion, or a copolymer emulsion of both of them (hereinafter collectively referred to as "acrylic synthetic resin emulsion") is a highly water-absorbent resin locally formed into a film. It is used as a binder for attachment, and it is important that it be rich in adhesive strength, flexibility and elasticity. Fluorine-based synthetic resin emulsions include various emulsions such as tetrafluoroethylene resin, tetrafluoroethylene-hexafluoropropylene resin, and fluorine-based modified resin. Silicone-based synthetic resin emulsions include monomethyltrichlorosilane and monoethyltrichlorosilane. Etc. and dimethyldichlorosilane, diethyldichlorosilane, and other polycondensation alkyd resins, phenolic resins, modified resin emulsions with cellulose derivatives, and the like, but there are various ones used in the present invention. Those that are rich in are desired (hereinafter, these are referred to as "fluorine-based synthetic resin emulsions"). Further, as the silicone-based synthetic resin emulsion, there is a condensed resin emulsion-based paint of monomethyl or diethyltrichlorosilane and dimethyl or diethyldichlorosilane. Also, antibacterial agents are added for the purpose of preventing mildew,
Phenol type, Nitotyryl type, Pyridine type, Imidazole type (Takeda Pharmaceutical Co., Ltd., Courtside-55D)
It is necessary to have a wide range of antifungal properties, chemical stability, safety for human body, and no offensive odor.

The blending ratio of the above four raw materials varies depending on the kind of the raw materials, but as a result of research, the following ratio (dry weight ratio of active ingredient) is preferable. Super absorbent resin 2-4 parts Emulsion of acrylic synthetic resin 5-7 parts Emulsion of fluorine synthetic resin 0.5-1.5 parts Antibacterial agent 0.05-0.2 parts Dispersing and mixing this raw material in water However, pure water or water whose salt concentration is as low as possible is desirable, and the amount of water is preferably about 30 times that of the highly water-absorbent resin (dry weight).

[0006]

[Function] Anti-condensation agent of the present invention (hereinafter referred to as "this agent")
Can be appropriately diluted with water to a concentration that makes it easy to apply, and can be easily applied by a method similar to that for general paints such as roller brush and spray gun. When this agent is applied and dried, a white translucent coating film is formed. Due to the function of the superabsorbent resin blended in this coating film, even if the film surface reaches the dew point, dew condensation is immediately absorbed and no dew condensation water is observed on the film surface. In addition, when the condensed water absorbed absorbs water from the dew point due to a decrease in the humidity of the environment around the coating film or an increase in the temperature of the low temperature part,
Immediately, the absorbed water is released by evaporation and returns to the original state, and the water absorption performance is restored. The acrylic synthetic resin emulsion used in this agent is a binder for locally adhering the super absorbent resin as described above, and not only has a strong adhesive force but also a super absorbent resin dispersed between the particles of the binder. Since it is necessary to withstand the swelling of the particles due to water absorption, it is important to incorporate a binder having excellent flexibility and elasticity as much as possible. The compounding ratio of the super absorbent polymer and this binder is as described above, and if this binder is excessive, the adhesiveness is strengthened, but the specific surface area of the super absorbent resin decreases and the water absorption performance decreases, On the other hand, when the amount is too small, the adhesiveness and the peeling resistance are deteriorated. The fluorine-based synthetic resin emulsion used in this product is compounded so that even if the temperature on the coating surface reaches the dew point temperature, water repellency causes water vapor in the air to condense and immediately form condensation on the film surface. It prevents water from becoming water and prevents the superabsorbent resin from unnecessarily absorbing water and immediately reducing the water absorption capacity. The compounding ratio is as described above, but if it is excessive, the absorption of the dew condensation water generated on the film surface will be deteriorated under the severe dew condensation conditions. In addition, without addition, the required water absorption amount of the super absorbent polymer increases, so that problems such as deterioration of water absorption performance, swelling of the coating film, and peeling are likely to occur. Mixing an emulsion such as a fluorine-based synthetic resin that also has oil repellency reduces the stain on the coating film. The antibacterial agent used in this drug is added to prevent the formation of mold, but it is ineffective in preventing dew condensation, and therefore it is desirable that it be effective even in a small amount. In addition, since this drug is often used in living spaces, it is necessary that it has excellent antifungal properties as well as long-lasting effects, and that it has no offensive odor or toxicity. The antibacterial agent (a compounding agent of a nitrogen-containing sulfur-based compound of a benzimidazole-based compound) used in the performance test described below showed excellent performance.

[0007]

[Example] 1. Test device As shown in FIG. 1, a low temperature constant temperature bath A and a constant temperature constant humidity bath B are adjacent to each other, a communication opening C is provided between the two baths, and a test piece P is hung so as to close the communication opening C, and its weight The effect of the anti-condensation agent was tested by a dew condensation generating device equipped with an electronic balance D for measuring. 2. Using a 200 mm x 200 mm x 1 mm test piece aluminum plate,
The following three types were prepared. Aluminum plate coated with 5 g of this agent (invention test piece) Aluminum plate coated with 5 g of fluorine-based synthetic resin emulsion-free dew condensation inhibitor (comparative test piece) Untreated aluminum plate (comparative test piece) 3. Preparation method of this agent Powdery super absorbent resin (SANYO CHEMICAL CO., LTD., Sunfresh ST-500MPS) in 90 parts of water (95% active ingredient)
3 parts were added and mixed well until a uniform paste was formed. Next, acrylic synthetic resin emulsion (Chuo Rika Kogyo Co., Ltd., Ricabond ES-1) (active ingredient 43%) 13
Department, Fluorine-based synthetic resin emulsion (Asahi Kasei Co., Ltd.,
Full on Loriantal coat) (active ingredient 40%) 2
Part, an organic nitrogen compound and an organic nitrogen-sulfur compound-containing white antibacterial agent suspension (Takeda Pharmaceutical Co., Ltd., Courtside-55D) (active ingredient 14%) (1 part) were added, and the mixture was thoroughly mixed for about 24 hours. After aging, the mixture was sufficiently stirred again. 4. Preparation Method of Fluorine-Based Synthetic Resin Emulsion-Free Dew Condensation Prevention Agent of Comparative Example Acrylic-based synthetic resin emulsion (Central Rika Kogyo Co., Ltd., Ricabond ES-1) was added in place of the addition of 2 parts of the fluorine-based synthetic resin emulsion in the components of the agent. ) 2 parts were added (15 parts total). The preparation method is the same. 5. Method of Applying Dew Condensation Agent 5 g of each was uniformly applied to an aluminum plate of a test piece, and dried at about 65 ° C. to an absolutely dry state.

6. Test results In the above-mentioned dew condensation generator, the front surface (test surface, coating surface) of the test piece faces the humidification side, the back surface faces the cooling side, the humidification side conditions are 20 ° C and RH 80% (the dew point at this time is 16 ° C). The temperature of the cooling side was changed and the state of dew condensation on each test piece was investigated. FIG. 2 shows the state of dew condensation when the surface temperature of the test piece is kept at 15 ° C., that is, the weight change due to moisture absorption, water absorption, and dew condensation of the test piece. The surface temperature of 15 ° C. of the test piece is a temperature close to the limit of whether or not dew condensation occurs under this humidification side condition, and the test piece of the present invention shows no dew condensation for a long time even visually or by touching with a finger. It was Although there was a slight increase in weight, it is considered that this is due to the moisture absorption of the coating film. On the other hand, in the comparative test piece, dew condensation was not observed in a short time, but it was slightly observed after a long time, and in the comparative test piece, water droplets were observed from the surface cloud in a short time. FIG. 3 shows the case where the surface temperature of the test piece was kept at 10 ° C., which was almost the same as the case of FIG. FIG. 4 shows the surface temperature of the test piece at 5 ° C.
When the temperature is extremely lowered, such a condition is a severe condition that is unlikely to be considered in a normal building environment. However, in the test piece of the present invention, dew condensation finally occurs on the surface after 2 hours and 15 minutes. Admitted. However, the dew condensation and absorbed water were diffused and returned to the original state within a short time when the temperature was returned to about room temperature with the surface temperature of 20 ° C. at the humidification side of 20 ° C. and RH of 40%. On the other hand, the comparative test piece was much inferior in its ability as a dew condensation preventive agent since it had a fast condensation exposure and a large water absorption amount per unit time. Further, in the comparative test piece, dew condensation was severe and the drop was dripping. Since aluminum has good thermal conductivity and does not absorb water, dew condensation will occur immediately when a temperature condition below the dew point is given, and since the dew condensation water generated is free water, the heat generated by convection of water inside the dew condensation water It is easy to move, has little heat insulation, and continues to condense with almost no decrease in dew rate.

From the above test results, the phenomenon of dew condensation on the surface coated with this product is as follows: Dew condensation generation force + Dew condensation water generation deterrence force-Water absorption by super absorbent polymer-Adiabatic effect by combined water in super absorbent resin- It is considered that this is due to the combined force of the decrease in water absorption due to the progress of water absorption in the superabsorbent resin + the release of absorbed water in the superabsorbent resin. That is, the test piece coated with this agent absorbs water only in the moisture absorption capacity at the beginning of the operation, and thereafter, due to water repellency, the occurrence of water that should originally be condensed and generated on the application surface, that is, dew condensation is extremely small, Therefore, the weight increase of the test piece due to the absorption of water is extremely small. Further, the absorbed water becomes bound water and heat is not transferred by convection, so that the heat insulating property is increased and the rate of dew condensation is reduced accordingly. If the operation is continued,
Due to the accumulated water absorption, the water absorption power gradually decreases, and the absorption of the generated dew condensation water becomes poor, and visible dew condensation occurs on the surface, but the appearance of visible dew condensation is much slower than that of the comparative test piece. When the coating film of this agent that absorbed water during operation was stopped and returned to a normal environment, the absorbed water immediately began to evaporate, and the coating film was restored to its state and performance within a short time.

Antifungal effect This agent was applied to a filter paper for chemical analysis and allowed to stand in a test room at 20 ° C. and RH 60% for 24 hours, and then the size was 40 mm × 40 mm.
It was cut into a test piece. This test piece was allowed to stand on an agar medium, and sprayed with 1 ml each of mold spore suspensions of Aspergius niger, Penicillium citrinum, Rhizopus stronifer, Cladosporium cladsporioites, Ketomium clobosum, etc. 28 ℃ ± 2 ℃,
After culturing at RH of 95% or more for 2 weeks, the growth of mold was observed. As a result, no mold was found on the test pieces coated with this drug, and neither discoloration nor unpleasant odor was observed. In addition, on the untreated test pieces that were not coated with this drug, which were also treated at the same time, generation of mold was observed on the entire surface.

[0011]

As described above, the anti-condensation agent according to the present invention is only applied thinly on the dew condensation-occurring portion, and even under severe dew condensation conditions, the coating film does not excessively swell and the strength of the coating film is high. It does not deteriorate, does not peel off, etc., and prevents the formation of dew condensation.When released from dew condensation conditions, the coating film immediately restores, and the long-term dew condensation prevention performance does not deteriorate at all, and it also has a fungicide prevention ability. Can also be given.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a dew condensation test apparatus.

FIG. 2 is a diagram showing a state where dew condensation occurs on a test piece.

FIG. 3 is a diagram showing a state where dew condensation occurs on a test piece.

FIG. 4 is a diagram showing a dew condensation state of a test piece.

[Explanation of symbols]

 A low temperature constant temperature bath B constant temperature constant humidity chamber C communication opening D electronic balance P test piece

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C09D 131/04 PFU 183/04 PMS

Claims (3)

[Claims] 1. A main component of a super absorbent polymer, an acrylic synthetic resin emulsion, a vinyl acetate synthetic resin emulsion or a copolymer emulsion of these two systems, and a fluorine synthetic resin emulsion or a silicone synthetic resin emulsion. An anti-condensation agent characterized in that 2. As a dry weight ratio of the active ingredient of the main component, 2 to 4 parts of super absorbent polymer, 5 to 5 parts of acrylic synthetic resin emulsion or vinyl acetate synthetic resin emulsion or copolymer emulsion of both these systems. The anti-condensation agent according to claim 1, wherein 7 parts, 0.5 to 1.5 parts of the fluorine-based synthetic resin emulsion or the silicone-based synthetic resin emulsion is used. 3. An antibacterial agent is added to the main component.
Or the dew condensation preventing agent according to 2.