WO2006070926A1

WO2006070926A1 - Material for plaster work

Info

Publication number: WO2006070926A1
Application number: PCT/JP2005/024243
Authority: WO
Inventors: Yoshihiro Nakagawa; Ryuichi Tamatsukuri
Original assignee: Sk Life Co., Ltd.
Priority date: 2004-12-27
Filing date: 2005-12-27
Publication date: 2006-07-06
Also published as: JP4705592B2; JP2009107926A; JPWO2006070926A1; KR20070089225A

Abstract

A material for plaster work containing Shirasu balloon as a primary material, which further comprises a powder comprising a poly(vinyl alcohol) powder as a binder dissolving in water at room temperature or an atmospheric temperature and drying and hardening at room temperature. A wet material for plaster work is prepared by adding water to the above material for plaster work, followed by kneading. If desired, a liquid chemical adsorbing agent is added to the material for plaster work during kneading. The chemical adsorbing agent is contained inside the Shirasu balloon and exhibits chemical adsorption function.

Description

Specification

—Technology field for plastering materials

The present invention relates to a plastering material, and more specifically, supplied to a construction site as a pre-mixed mixed powder, added with kneaded water, and kneaded at the room temperature or atmospheric temperature, so that walls and ceilings are obtained. It relates to wet plastering material that can be applied to the surface as a finish. Background art

Plastering materials such as cement mortar are widely used as interior finishing materials for buildings. Plasterer materials have been used for many years in the construction of many buildings as wet materials that plasterers can trowel on construction surfaces (interior finishes). A typical plastering material is cement mortar in which cement is mixed with fine aggregates such as fine soil and sand, and an appropriate amount of kneaded water is added to the mixture. In addition to cement mortar, various plastering materials such as resin mortar, self-leveling material, and synthetic resin coating have been used at many construction sites.

In general, such plastering material is stored in a bag or container as a powder material, transported to each construction site, kneaded with water at the construction site by a plasterer, and immediately used as a fluidized kneading material on the ground surface. It is used in applications such as troweling, and in many cases the mixing of powder and water depends on the experience of the plasterer.

In recent years, a variety of plastering materials with excellent thermal insulation and sound absorption performance have been researched and developed. As this type of plastering material, plastering material containing shirasu balloon powder as an aggregate is known. For example, Japanese Patent Application Laid-Open No. 7-155739 discloses a lightweight mortar cosmetic material obtained by kneading a mixed material containing cement, fine powder of shirasu balloon, grains, or seed stone with SBR synthetic resin liquid and water. It is disclosed. Also, Japanese Patent Application Laid-Open No. Hei 6 _ 1 0 7 9 6 describes a paste-like coating material obtained by mixing a room-temperature-crosslinking synthetic emulsion resin liquid with powder containing shirasu balloon, white cement, silica sand and the like. . This coating material is mainly used as heat insulation for building exteriors.

However, conventional plastering materials using shirasu balloons are supplied to construction sites as a resin to be mixed with resin such as resin liquid, so relatively strict on-site management associated with the measurement and mixing of resin liquid Is needed. For this reason, this type of plastering material is made by mixing plasterers with powder and water, depending on the experience and intuition of craftsmen, as in traditional plastering materials such as cement mortar, or by simple weighing. And when kneading water, it is difficult to use in simple on-site kneading work.

In addition, since the resin mixed in the powder causes clogging of the porous structure of the Shirasu balloon, the effects unique to the Shirasu balloon (humidity-adjusting effect, adsorption effect, sound-absorbing effect, sound-absorbing property, etc.) are considerably lost. Is called. Shirasu balloons have the effect of physically adsorbing the odor of room air, VOC (volatile organic compounds) in room air, or VOC generated from interior base materials. It is not desirable that the action is impaired.

Furthermore, in the case of conventional plastering materials including shirasu balloons, when this is applied to a base such as a wall surface, a base treatment (before applying a primer or sealer to the base surface) is used to sufficiently adhere the plastering material to the base surface. Treatment process and ground treatment to improve the adhesion of plastering material by forming irregularities in the ground material). However, this kind of ground treatment may complicate the plastering process, or may result in a relatively large number of processes and time required for plastering.

Moreover, even with such a base treatment, it is difficult for conventional plastering materials to be applied to a horizontal looking-up surface such as a ceiling surface, and even if temporarily applied, there is concern about the long-term stability or durability of the finishing material. Is done.

The present invention has been made in view of such circumstances, and the object of the present invention is to obtain a desired sound absorbing property, workability, humidity control property, lightness, heat insulation and non-combustibility as a plastering material containing a shirasu balloon. As well as pre-prepared powder. Can be kneaded with water relatively easily at the construction site without weighing and mixing the resin liquid, and it can be applied to the wall or ceiling surface without any special ground treatment. It is to provide a wet plastering material that can. Another object of the present invention is to provide a plastering material that effectively exhibits a physical adsorption action and a chemical adsorption action for adsorbing odors or VOCs in room air, VOCs generated from interior base materials, and the like. Disclosure of the invention

In order to achieve the above object, the present invention is a plastering material comprising a shirasu balloon as a main material, comprising a powder containing polyvinyl alcohol powder as a binder that dissolves in water at room temperature or atmospheric temperature and is dry-cured at room temperature. The present invention provides a plastering material characterized by being prepared as a wet plastering material that can be applied to a wall surface or ceiling surface by simply being kneaded with kneading water at the construction site.

The plastering material of the present invention can be transported to the construction site in the state of being stored in a can or bag as a pre-prepared powder. By simply adding an appropriate amount of water to the plastering material of the present invention and kneading at the construction site, a kneaded material that can be coated with a iron or roller can be easily obtained. Therefore, the powder raw material of the above blending can be obtained by the traditional method when the plasterer kneads on site with the appropriate amount of water, and the special or special skills for on-site blending can be obtained. Not needed.

The plastering material of the present invention exhibits the desired sound-absorbing property, workability, humidity control, light weight, heat insulating property and nonflammability as a plastering material containing a shirasu balloon. The plastering material of the present invention is also prepared into a wet plastering material that can be applied to the wall or ceiling surface by simply carrying it to the construction site as a pre-mixed powder and kneading it with water at the construction site. In addition, the wet plastering material obtained in this way can be applied to the wall surface or ceiling surface without requiring a special ground treatment.

The present invention is also a method for preparing a plastering material, characterized in that the wet plastering material is prepared by adding water and a liquid chemical adsorbent to the plastering material powder at a construction site and kneading them. Provide law.

The present invention further provides a cured product obtained by drying and curing the plastering material, wherein a chemical adsorbent is contained in a shirasu balloon. The present invention also relates to a cured product of a wet plastering material mainly composed of a shirasu balloon, which is a cured product of a wet plastering material applied to a wall surface or a ceiling surface and cured, and mixed with the chemical adsorbent when the plastering material is kneaded. Is contained in the shirasu balloon.

According to such a plastering material preparation method or plastering material cured body, the chemical adsorption action of the chemical adsorbent is greatly improved by the surface area expansion effect and the air trapping effect of the shirasu balloon. Therefore, it is possible to construct indoor wall surfaces or ceiling surfaces that effectively adsorb VOC such as formaldehyde in indoor air and odorous substances in indoor air. In addition, such a plastering material coating or coating film captures and adsorbs VOCs generated from the interior base material. Brief Description of Drawings

FIG. 1 is a partial sectional front view schematically showing a hollow structure of a shirasu balloon. Figure 2 is a photomicrograph of the Shirasu balloon.

Figure 3 is a photomicrograph of the Shirasu balloon.

Fig. 4 shows a diagram (Fig. 4 (A)) showing the results of the heat insulation / heat insulation test of the plastering material of the present invention, and a schematic cross-sectional view showing the methods of the heat insulation and heat insulation tests (Fig. 4 (B)). It is. FIG. 5 is a diagram showing the test results of the formaldehyde adsorption test of the plastering material of the present invention.

FIG. 6 is a schematic cross-sectional view showing the kneading process of the plastering material of the present invention.

FIG. 7 is an indoor partial perspective view of a building showing a construction example of the plastering material of the present invention. FIG. 8 is a conceptual diagram showing in principle the adsorption action such as VOC of the plastering material of the present invention.

FIG. 9 is a diagram showing the measurement results of the far-infrared emissivity for the plastering material of the present invention. W

BEST MODE FOR CARRYING OUT THE INVENTION

According to a preferred embodiment of the present invention, the particle size of the shirasu balloon is in the range of 40 to 1550, preferably in the range of 70 to 80, and the polyvinyl alcohol powder is granular or It is a powder in which powdered polyvinyl alcohol and granular or powdered sodium sulfate are mixed at a predetermined ratio (for example, a ratio of 80 to 90% polyvinyl alcohol and 10 to 20% sodium sulfate).

Preferably, the plastering material includes 55% by volume or more of the above shirasu balloon, and includes 4 to 15% by volume of the polyvinyl alcohol powder. More preferably, the plastering material further includes an inorganic pigment or a colored aggregate obtained by firing and welding ceramic inorganic pigment on the surface of natural silica, volcanic ash or pumice having a predetermined particle size.

The plastering material is preferably blended so as to obtain a cured product specific gravity of 0.35 to 0.5, more preferably 0.35 to 0.4.

Preferably, the plastering material of the present invention exhibits a far-infrared emissivity of 70% or more with respect to far-infrared rays in the wavelength range of 10 to 20 ^ under the temperature condition of 35. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partial sectional front view schematically showing a hollow structure of a shirasu balloon, and FIGS. 2 and 3 are micrographs of the shirasu balloon.

Shirasu is known as a volcanic eruption widely distributed in Kyushu, Japan. Although the chemical composition of Shirasu is relatively stable, the mineral composition and particle size composition vary considerably depending on the location. Shirasu with a lot of glassy material is selected, dried, and instantly heated to about 100000 in a short time of 1 second or less, thereby softening the vitreous material of the silica particles and confining it to the glass. The water that has been produced can be gasified by heating, whereby the shirasu can be modified or modified into hollow foam particles. Shirasu balloons shown in FIGS. 1 to 3 are known as hollow foam particles produced by utilizing such properties unique to Shirasu.

The Shirasu Balloon has a porous structure as shown in Fig. 1 and is lightweight and absorbs moisture. It is known as a material with excellent properties and incombustibility. However, wet plastering materials mixed with shirasu balloons do not exhibit sufficient performance as plastering materials in terms of ease of handling, strength after drying and curing, base adhesion, base adhesion strength, etc. In order to improve this point, it has been considered that a relatively large amount of resin must be mixed with the Shirasu balloon powder, and as a result, the effects unique to Shirasu balloons are impaired. Even if such problems can be overcome to a certain extent, when applying a wet plastering material mixed with shirasu balloons to the lower ground of a concrete wall or the like, as with normal plastering material, Wet plastering material with a mixture of glass balloons on the wall (for example, a wall with a vinyl cloth) or ceiling that is difficult to perform such pre-treatment. Has been considered difficult to construct.

The present inventor can fully exhibit the advantages unique to Shirasu balloons such as lightness, moisture absorption, and nonflammability, as well as ensuring good substrate adhesion or substrate adhesion strength, and further, primer treatment or A plastering material powder having the following composition was prepared so as to omit the pretreatment such as one-lar treatment.

Formula of base powder (volume%) (1)

Shirasu Balloon Powder 5 5-80%

Shirasu grains 10 to 25%

White cement 3 1 0%

Polyvinyl alcohol powder 5-15%

Formula of base powder (volume%) (2)

Shirasu balloon powder 60-75%

Shirasu volcanic ash (1 to 1 / 5mm grains) 15 to 0%

Shirasu volcanic ash fine particles 15 to 20%

White cement 50%

Methylcellulose 1-3%

Polyvinyl alcohol powder 4 7% The particle size of the shirasu balloon was in the range of 70 to 80. A mixture of polyvinyl alcohol and sodium sulfate powder was used as the polyvinyl alcohol powder. As such polyvinyl alcohol powder, a blend of 80 to 90% by weight of polyvinyl alcohol powder and 10 to 20% by weight of sodium sulfate powder can be used.

Polyvinyl alcohol powder usually dissolves in warm water of 70 or more, but does not dissolve in water at room temperature or atmospheric temperature. For this reason, in general, it is often handled in the form of a solution. However, the polyvinyl alcohol powder, which is made of a powder obtained by mixing an appropriate amount of granular sodium sulfate with granular polyvinyl alcohol, dissolves in water at room temperature or atmospheric temperature, cures when the water evaporates, and forms a film by dehydration. Coat the shirasu balloon. Moreover, it has been found that polyvinyl alcohol works as a binder but does not clog the surface of the shirasu balloon. In addition, what is used for manufacture of a drinkable tablet (medicine) can be used as such a polyvinyl alcohol powder. The base powder can be transported to the construction site as a pre-prepared powder in a can or bag. By adding an appropriate amount of water to the base powder and kneading at the construction site, a kneaded material that can be coated with a iron or roller can be obtained. For this reason, the powder raw material having the above composition can be prepared into a plastering kneaded material by a traditional method such as ordinary cement mortar when the plasterer kneads on site with an appropriate amount of water. Therefore, special or special skills for on-site blending are not required, such as addition or mixing of resins, etc., or two-component mixed plastering materials. If desired, a trace amount of inorganic pigment is additionally added to the base powder. The inorganic pigment is mixed with the base powder in an amount of 0.3% (volume%) or less, for example, about 0.15% (volume%).

As a modification, a color base powder may be added to the base powder. As the color base powder, natural silica stone, volcanic ash, pumice, etc. with uniform particle sizes are used as raw materials, and the surface is specially processed with inorganic pigments for ceramics, and colored aggregates are fired and welded in a high-temperature kiln. You may do it. Such color base powder is acid resistant It is resistant to fading and discoloration when exposed to sunlight, wind, and rain. In addition, such colored aggregates are nonflammable, do not generate gas smoke in the event of a fire, and are advantageous from the standpoint of fire prevention and fire resistance. Base powder: force The ratio of the base powder (volume ratio) is set to about 1: 0.05 to 0.20.

FIG. 4 (A) is a diagram showing the test results of the heat insulation / heat insulation test of the plastering material of the present invention, and FIG. 4 (B) is a schematic sectional view showing the method of the heat insulation / heat insulation test.

Heat insulation In the heat insulation test, the plastering material of the present invention and vinyl cloth (comparative example) were used as test specimens. An aluminum plate with a vinyl cloth attached to an aluminum plate, an aluminum plate with the plastering material applied to a thickness of 1 mm, and an aluminum plate with the plastering material applied to a thickness of 2 mm were prepared. The surface of the aluminum plate was heated with a Pana flame of a heat gun, and the surface temperature of the specimen (vinyl cloth surface temperature and plastering material surface temperature) was measured. As shown in Fig. 4 (A), the surface temperature of the vinyl cloth reached about 60 ° C, but the surface temperature of the plastering material of the present invention was about 40 (coating thickness 2mm). It was. The thermal conductivity of the plastering material of the present invention is about 0 · 06wZm 'K, glass wool (approx. O.lwZm'K), wood (approx. 0.2WZm, K), concrete (approx. L.SWZm'K) Compared to etc., it exhibits much higher heat insulation and heat insulation.

Figure 5 is a diagram showing the results of the formaldehyde adsorption test.

The formaldehyde adsorption test result of the plastering material of the present invention is shown in FIG. 5 together with the blank (glass plate) test result. In the plastering material of the present invention, the formaldehyde concentration set to the initial concentration of 19 ppm decreased to less than lppm in about 3 hours. As is clear from the comparison with the formaldehyde adsorption test result of the blank (glass plate), the plastering material of the present invention exhibits an effective formaldehyde adsorption effect. The formaldehyde adsorption test was conducted at the Chemical Substance Evaluation and Research Institute.

In addition, the present inventor has conducted various tests. According to these test results, the plastering material of the present invention has a fine foam structure or porous structure of a shirasu balloon. Therefore, it was proved to exhibit excellent hygroscopicity and sound absorption. Further, the specific gravity of the plastering material of the present invention is 0.5 or less (the above composition (1)) or 0.35 to 0.4 (the above composition (2)), and is quite lightweight. .

Examples of the shirasu balloon that can be suitably used include the following physical properties. Viscosity: 5 to 500 m

Moisture absorption: 0.08% (24 hours · weight%)

Thermal conductivity: 0.05 ~ 0.07 kcal / m-h-'C

Softening start temperature is about 1000

Melting point 1200 ~: L300 ° C

Strength 80〜; L00kg / cm ² (Apply hydrostatic pressure for 2 minutes)

Component Si0 ₂ 75-77%, A1 ₂ 0 ₃ 12-14%, Fe ₂ 0 ₃ 1-2%, Na ₂ 0

3-4%, K ₂ 0 2 4%, lgloss 2-5%

The present inventor prepared a powdery plastering material of 10 liters by using the following Shirasu balloon and mixing the powder of the plastering material with the following composition.

Shirasu balloon powder 6.00 liter

Shirasu grain 1.25 liters

White cement 0.50 liter

Polyvinyl alcohol powder 0.7 7 5 liters

Color base powder 1. 50 liters

The polyvinyl alcohol powder is a powder in which 80 to 90% by weight of granular polyvinyl alcohol and 10 to 20% by weight of granular sodium sulfate are blended. In order to reduce the specific gravity of the plaster material cured product, Shirasu volcanic ash fine particles and inorganic pigments (a trace amount) may be used instead of the color base powder.

The present inventor added an appropriate amount of water to this powdery plastering material, kneaded on-site, and then applied this kneaded material to a concrete surface that has not been subjected to any pretreatment such as primer treatment or sealer treatment. Applied. The plastering material after drying and curing was sufficiently adhered to the concrete surface, and cracking and peeling were not observed at all. The present inventor also applied the kneaded material directly to the wall surface of the vinyl cloth (without performing pretreatment or the like). The plastering material after drying and curing adhered well to the vinyl cloth surface, and no cracking or peeling was observed at all, as was the case with the concrete surface.

The present inventor further applied the kneaded material to a ceiling surface that had not been subjected to a ground treatment. The plastering material of the present invention, which is lightweight and has good base adhesion, can be applied to the ceiling surface well.

The surface drying time of the plastering material after application is about 48 hours in winter and about 24 hours in summer. For the plastering material to dry completely, it takes about 4 days after application in winter and about 2 days in summer.

FIG. 6 is a schematic cross-sectional view showing a mode in which the powdery plastering material of the present example is kneaded with tap water in the field.

In use, after sealing the powdery plastering material of the present embodiment mixed with the above-mentioned base powder and color base powder in a container and carrying it to the construction site, for example, powder for about 4 liters of tap water Mix 10 liters and knead until a uniform paste is obtained while adjusting the amount of water appropriately. For mixing and stirring, it is desirable to use a relatively low-speed stirrer.

FIG. 7 shows an interior perspective view of a building defined by a wall surface 1, a ceiling surface 2, and a floor surface 3.

As shown in Fig. 7, the plastering material after kneading is applied to wall surface 1 or ceiling surface 2 using a gold trowel, wood trowel, pattern roller, etc. When applying, finish the interior wall surface 1 1 or interior ceiling surface 1 2 so that air bubbles do not enter while reciprocating the iron once or twice on the coating surface (wall surface 1, ceiling surface 2). Usually, it can be painted once, but it may be painted twice if desired. When applying twice, apply once after the coated surface dries. The plasterboard surface, mortar surface, concrete surface, veneer can be used as the application surface (base surface) on which this plastering material can be applied without applying sealer treatment or primer treatment. (Wooden plywood) surface, vinyl cloth surface, painted surface, Juraku wall surface, sand wall surface, fiber wall surface, ALC plate surface, etc. Preferably, the thickness (coating thickness) of the plaster material cured body 10 is set to 5 mm or less. The plastering material after drying and curing adheres well to the coated surface and does not cause cracking or peeling.

However, in the case of a substrate with a relatively high water absorption rate such as ALC, there is no problem with the adhesion of the plastering material, but the construction surface of the plastering material may become powdery. In such cases, it is desirable to apply a sealer treatment as necessary. It is preferable to use an aqueous sealer as the sealer. In addition, when applying plastering material to an existing paint surface, it is desirable to check the strength of adhesion between the paint and its ground surface, and when a choking phenomenon (whitening phenomenon) occurs. A sealer treatment would be required. Furthermore, if plastering material is applied to the veneer surface, the veneer surface may need to be rubbed if necessary.

The plastering material of the present invention can be applied to the construction surface without any sealer treatment or primer treatment of the construction surface in principle, except in exceptional cases, so it is extremely advantageous as a plastering material. is there. In particular, plastering materials that can be applied directly to vinyl cloth surfaces have not been seen in the past, and the nature of the plastering material of the present invention that can be applied directly to vinyl cloth surfaces is notable. This is considered to be caused by the fact that the plastering material of the present invention is extremely light and has high adhesiveness. For example, according to the plastering material of the present invention, the wall surface of the vinyl cloth can be repaired without removing the vinyl cloth. The vinyl cloth may partially float or peel off due to long-term use. In such a part, a stable or the like is driven into the vinyl cloth surface with a tool such as a tucker, and the floated or peeled part is removed. It is desirable to apply plastering material after fixing to the wall. The interior wall surface 1 1 or interior ceiling surface 1 2 finished with the plastering material of the present invention sufficiently exhibits the effects unique to the glass balloon. As a Shirasu balloon effect, humidity control effect (the effect of absorbing moisture when indoor humidity is high, the effect of releasing moisture when dried), heat insulation effect (hollow porous structure), adsorption decomposition effect (adsorption decomposition of harmful components, odors, etc.) , Effects such as sound absorption effect (hollow porous structure), nonflammability, and lightness (Kaza specific gravity of Shirasu balloon is about 0.16 to 0.20). Note that the plastering material of this embodiment usually does not drip even if it is applied once, so that the construction process can be shortened and labor can be saved.

Next, the chemical substance adsorption effect and far infrared radiation effect of the plastering material of the present invention will be described.

The action of adsorbing substances in the air is broadly divided into physical adsorption and chemical adsorption. A porous Shirasu balloon mainly adsorbs odors in the air or VOC, etc., mainly due to physical adsorption, but the physical adsorption is generally understood as a reversible change associated with temperature, pressure, etc. That is, molecules adsorbed on the adsorbent by physical adsorption are likely to be released again. On the other hand, chemisorption is generally recognized as an irreversible change, and odors in the air or VOCs adsorbed by the adsorbent are difficult to re-release. Liquid chemical adsorbents such as graft polymerization polymer coatings are known as chemical adsorbents for reducing VOC such as formaldehyde generated from building materials. Examples of the graft polymerization polymer coating agent include “Grafton” (product of Grafton Co., Ltd.). This type of chemical adsorbent has been put into practical use because it has been evaluated for its low re-emission when applied to a wall or the like so as to form a coating film, and the ability to selectively adsorb adsorbents. . However, in order to enhance the use of such an adsorbent, the surface area of the wall surface of the room must be increased, and if it is simply applied to the surface of the wall body with a brush or the like, the chemical adsorption action is limited.

As shown in Fig. 5 (formaldehyde adsorption test results), the plastering material of the present invention physically adsorbs formaldehyde by the porous structure of the shirasu balloon. In addition, the Shirasu balloon exhibits a high thermal insulation effect, so that an increase in internal temperature is suppressed and formaldehyde re-release is unlikely to occur. As shown by symbol b in FIG. 5, in the case of a blank (glass plate), the formaldehyde concentration starts to increase after about 25 hours (re-emission starts), whereas in the plastering material of the present invention, FIG. As shown by the symbol a, such an increase in formaldehyde concentration is unlikely to occur (difficult to re-release). The physical adsorption effect of this shirasu balloon and In order to make more effective use of the porous structure of the balloon, a liquid chemical adsorbent such as a graft polymer or coating film is added when the powdered plastering material is kneaded (FIG. 6). Fig. 8 is a conceptual diagram that shows in principle the adsorption action of VOC, etc. of plastering material mixed with liquid chemical adsorbent.

Fig. 8 (A) conceptually shows the surface structure of the plaster material cured body constructed on the wall or ceiling. The room air 21 enters the shirasu barn 2 2 of the cured body from the surface 20. The shirasu balloon 22 captures the air 21 that has entered the porous structure. Moreover, the inside of the shirasu balloon 22 has a large surface area, and a gap is formed between the shirasu balloons 22. As shown in FIG. 8 (B), the chemical adsorbent 2 3 adhering to the inside of the Shirasu balloon 22 or the chemical adsorbent (not shown) adhering to the gap between the Shirasu balloon 2 2 is in the air 21. Effectively chemisorbs odorous substances or VOCs. In addition, the chemical adsorbent adhering in the Shirasu balloon 22 2 or between the Shirasu balloons 22 chemisorbs V O C or the like (symbol 25) generated from the building material (base material) on the wall surface 1 or the ceiling surface 2. Thus, the plastering material of the present invention mixed with the chemical adsorbent exhibits a physical adsorption action by the shirasu balloon and also exhibits a high chemisorption action by the surface area expansion effect and the air trapping effect of the shirasu balloon.

The plastering material of the present invention further has a far infrared radiation effect. FIG. 9 shows the far-infrared emissivity measurement results for the plastering material of the present invention.

As shown in FIG. 9, the cured product of the plastering material of the present invention has a far-infrared emissivity of 80% or more (the theoretical maximum value of far-infrared is 100 0 (black) in the wavelength band 6-22. In recent studies, it was found that the ratio of the radiation intensity of the sample) This is the highest level of far-infrared radiation. The effects of far-infrared rays (blood circulation promotion, etc.) are well known, but such building finishing materials that exhibit a high level of far-infrared radiation have not been confirmed in the past, and the plastering material of the present invention Is also very advantageous from the viewpoint of far-infrared radiation.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and the scope of the present invention described in the claims. Various modifications or changes can be made.

For example, the white cement blended in the base powder is for obtaining the hardness of the plastering material after dry hardening, and sodium silicate (Natrium) may be used in place of the white cement. It is also possible to use methylcellulose instead of polypinyl alcohol. Furthermore, as a chemical adsorbent, a liquid air catalyst (for example, trade name “SELFIEL” (product of Nichirin Chemical Co., Ltd.)), an aldehyde-specific catcher agent (for example, trade name “Chemcat” (Otsuka Chemical Co., Ltd.) Products))), or other chemical adsorbents that exhibit VOC adsorption or deodorization effects may be used. The chemical adsorbent may be a liquid substance that can be mixed with the plastering material when the plastering material is kneaded, or may be a soluble substance that can be liquefied after being brought into the field. Industrial applicability

The plastering material of the present invention is a wet finishing material that can be applied to a wall surface and a ceiling surface by being supplied to a construction site as a pre-prepared mixed powder and then being kneaded at room temperature or atmospheric temperature with kneading water added. Can be used as interior finishing material for a wide variety of buildings.

Claims

The scope of the claims

1. In plastering materials mainly made of shirasu balloons,

It consists of a powder containing polyvinyl alcohol powder as a binder that dissolves in water at room temperature or atmospheric temperature and is dry-cured at room temperature. It is carried into the construction site as a powder and is simply kneaded with kneading water at the construction site. Or a plastering material prepared to be a wet plastering material that can be applied to the ceiling surface.

2. The plastering material according to claim 1, wherein the particle size of the shirasu balloon is in the range of 40 to 1550 m.

3. The plastering material according to claim 1, wherein the polyvinyl alcohol powder is a powder obtained by mixing a predetermined amount of sodium sulfate powder.

4. The plastering material according to any one of claims 1 to 3, comprising 55% by volume or more of the shirasu balloon and 4 to 15% by volume of the polyvinyl alcohol powder.

5. The plastering material according to any one of claims 1 to 4, further comprising an inorganic pigment or a colored aggregate.

6. The plastering material according to any one of claims 1 to 5, wherein the specific gravity after drying and curing is 0.35 to 0.5.

7. The plastering material, wherein the wet plastering material is prepared by adding water and a liquid chemical adsorbent to the plastering material powder according to any one of claims 1 to 6 at a construction site and kneading the mixture. Preparation method.

8. A cured product obtained by drying and curing the plastering material according to any one of claims 1 to 6, wherein the plastering material includes a chemical adsorbent in a shirasu balloon.

9. A cured product of a wet plastering material mainly composed of a shirasu balloon, which is applied to a wall surface or a ceiling surface and cured.

A cured material for plastering material, wherein a chemical adsorbent mixed at the time of kneading the plastering material is contained in the Shirasu balloon.

10. The shirasu balloon having a particle size of 40 to 1550 m is contained by 55% by volume or more, and the specific gravity after drying and curing is 0.35 to 0.5. The plaster material cured body according to 9.

11. Polyvinyl alcohol powder that dissolves in water at room temperature or atmospheric temperature, and is dried and cured at room temperature to act as a binder is contained in the plaster material powder before kneading. 10. A plaster material cured product as described in 10.

12. The far-infrared emissivity of 70% or more with respect to far-infrared rays in a wavelength band of 10 to 20 under the temperature condition of temperature 35 is any one of claims 9 to 11 1 The plastered material cured product according to the item.