JP6385026B1 - Water-based paint composition, air purification mechanism and air purification method - Google Patents

Abstract

An aqueous coating composition, an air purification mechanism, and an air purification method capable of forming a coating film with excellent quality and exhibiting a sufficient air purification function for an indoor space are provided.
The water-based coating composition has a weight ratio based on the total amount in the coating composition of cationic acrylate copolymer aqueous emulsion: 29.07%, water: 29.07%, 1500 mesh charcoal powder. (Center particle size 10 μm): 19.38%, 3000 mesh charcoal powder (center particle size 5 μm): 9.69%, aluminum hydroxide: 4.84%, acrylic polymer: 2.91%, preservative : 2.91%, urethane-modified polyether: 1.94%, fungicide: 0.10%, silicone antifoaming agent: 0.01%.
[Selection] 1

Description

  The present invention relates to an aqueous coating composition, an air purification mechanism, and an air purification method. Specifically, the present invention relates to an aqueous coating composition, an air purification mechanism, and an air purification method that can form a coating film with excellent quality and that can exhibit a sufficient air purification function for indoor spaces. .

  For the purpose of protecting the object and imparting aesthetics and functionality, a paint applied to the surface of the object is used. There are a wide variety of objects to which the paint is applied, such as buildings, vehicles, electric machines, metal products, furniture, leather, and the like, and various types of paint exist for each application.

  Among paint applications, paints for building interiors, especially those applied to walls and ceilings in indoor spaces, not only protect the coating surface and improve design, but also improve the environment of indoor spaces. Contribute. This building interior paint is mainly composed of a synthetic resin, a pigment, an additive and a solvent.

  Examples of paints that contribute to improving the environment of indoor spaces include dust and dirt in indoor spaces, chemical substances such as formaldehyde and volatile organic compounds (VOC) contained in furniture and building materials, odors of tobacco, pets, etc. It has the ability to reduce or adsorb harmful substances and unpleasant substances.

  Under these circumstances, for example, there is an aqueous coating composition described in Patent Document 1 as an attempt to efficiently adsorb harmful substances in the air in an indoor space.

  Such a water-based coating composition described in Patent Document 1 is a coating for obtaining a coating film for building interiors, and has a surfactant and a carboxyl group copolymerizable with an α, β-ethylenically unsaturated monomer. An aqueous resin dispersion (A) in which 0.5% by mass to 10% by mass of an ethylenically unsaturated monomer having a carbonyl group excluding a carboxyl group is copolymerized as an essential component. The compound (B) which has 2 or more of hydrazide groups in a molecule | numerator, and activated carbon (C) are included. This paint adsorbs harmful substances by activated carbon.

  In addition, there is a case where a paint containing a conductive component in a paint composition is used for an air purification mechanism in an indoor space. For example, the inventors of the present application are utilizing and developing a paint containing conductive charcoal powder.

  This conductive paint purifies the air in the indoor space by capturing positively charged particles in the air in the indoor space. For example, waste gas and particulate matter such as PM2.5 tend to exist as their constituent particles are positively charged in the atmosphere. In addition, ammonium ions are mainly present in the air. By connecting a negative voltage generator to the coating film surface of the conductive paint and charging the coating film surface to a negative voltage, the positively charged particles as described above are captured, and the room The air in the space can be purified.

JP 2010-174184 A

  However, in the paint for obtaining a conventional paint film for building interiors, including the aqueous paint composition disclosed in Patent Document 1, the uniformity of the paint film (uniformity of the film thickness of the paint film) and the storage stability It is considered that there is room for improvement in various coating film performances such as (precipitation of an inorganic pigment which is a kind of pigment), adsorptivity of harmful substances, adhesion strength to a base material, flame retardancy, and the like.

  In particular, the particle size of the inorganic pigment (aggregate) composed of powders of minerals, shells, charcoal, activated carbon and the like contained in the paint affects the quality and performance of the coating film. For example, when charcoal powder is used as an inorganic pigment, if the charcoal powder particle size is large, unevenness occurs in the coating film, smoothness is impaired, charcoal powder falls off, or charcoal powder precipitates in the paint. Occurs.

  If the particle size of the charcoal powder is small, the amount of the synthetic resin for forming the coating film increases, the organic content in the paint increases, and it becomes easy to burn, resulting in insufficient flame retardancy. Furthermore, there is a problem that the manufacturing cost for reducing the particle size is increased.

  In addition, for the paint imparted with the above-described conductivity, paints containing an aqueous or alcoholic solvent (aqueous paint composition or alcoholic paint composition) are mainly used, but there are drawbacks due to the respective solvents. there were.

  First, as a premise, in the paint imparted with conductivity, the charcoal powder particles in the paint come into contact with each other, and the conductivity of the paint is ensured through the particles.

  Here, the water-based coating composition requires a larger amount of synthetic resin to form a coating film containing charcoal powder than the alcohol-based coating composition, and the resin layer becomes thicker. When the amount of the synthetic resin is large, contact between the particles of the charcoal powder tends to be hindered, and the conductivity of the paint is lowered. As a result, it is difficult to obtain a good charged state for capturing positively charged particles in the air on the coating film surface of the paint.

  On the other hand, the alcoholic coating composition is superior to the aqueous coating composition in that it requires less synthetic resin to form a coating film containing charcoal powder, and the resin layer becomes thinner, so it has excellent conductivity. Yes. However, in an alcoholic coating composition, since the blending amount of the synthetic resin is small, the bending resistance of the coating film is low, and the coating film is likely to crack according to deformation of the substrate.

  The portion where the cracks occurred on the coating film was an electrically discontinuous region, and there was also a problem that the conductivity of the coating material was lowered. Also, the main alcoholic solvents such as ethanol, methanol, 1-propanol, etc. are volatile organic compounds (VOC), which are harmful to human health. There is a request to replace it. Thus, the conventional paint imparted with conductivity is insufficient in conductivity, coating film performance, and safety.

  The present invention was devised in view of the above points, and can form a coating film with excellent quality and can exhibit a sufficient air purification function for indoor spaces. It is an object to provide an object, an air purification mechanism, and an air purification method.

  In order to achieve the above object, the aqueous coating composition of the present invention contains a binder composed of a synthetic resin, charcoal powder composed of at least two powders having different particle sizes, and water. It has become.

  Here, the synthetic resin becomes the main component of the coating film because the binder is composed of the synthetic resin. That is, the synthetic resin connects the particles of the charcoal powder to form a coating film.

  The charcoal powder functions as an aggregate that gives the resin thickness and strength and imparts conductivity to the aqueous coating composition. Furthermore, charcoal powder adsorbs odors, chemical substances, moisture, and the like.

  In addition, since the charcoal powder is composed of at least two powders having different particle sizes, when the paint is applied to the base material, the charcoal powder having a small particle size is interposed between the charcoal powders having a large particle size. It becomes a thing which penetrates, the uniformity of the filling state of charcoal particles can be improved, and the filling rate of charcoal powder per unit area can be improved. In addition, a base material here means the area | region where the coating film surface of a coating material is provided through intermediate | middle members, such as an insulating layer etc., or the object where coating material is applied. Furthermore, the base material is a plate-like body attached to a frame-like base structure constituting the wall surface.

  In addition, since the uniformity of the charcoal particle filling state is increased, the coating film surface of the paint becomes uniform (the film thickness is uniform), and the film formability, flexibility, surface contamination, and surface scratch adhesion are good. It can be. Moreover, the appearance of the coating film can be improved.

  Moreover, the electroconductivity of a coating material improves because the contact area of charcoal particles increases. Moreover, the coating film strength can be increased.

  Furthermore, since the uniformity of the charcoal particle filling state increases, when the entire coating surface is viewed as an electrode surface that is charged to a negative voltage, the uneven electrical resistance value on the coating surface is reduced, and positive in air. The collection efficiency of the charged particles can be increased.

  In addition, since the coating film surface of the paint becomes uniform, the charcoal particles are less likely to fall off after application as compared with a mixture of charcoal powder having a single particle diameter (average particle diameter) in the paint.

  Further, since the coating film surface of the paint is smoothed, whitening when the coating film surface is touched with a finger is suppressed. Moreover, the adhesive strength at the time of sticking a cloth on the coating surface is improved.

  Furthermore, the charcoal powder having a different particle size is dispersed in the paint compared to the mixture of the charcoal powder having a single particle size in the paint, thereby increasing the viscosity of the paint and storing or placing the paint. At this time, it becomes difficult for the charcoal powder having a large particle size to precipitate. That is, the storage stability is improved.

  Moreover, since the surface area of charcoal powder becomes large by using charcoal powder with a small particle diameter, adsorption | suction efficiency, such as a smell, a chemical substance, and moisture, improves.

  Moreover, a synthetic resin and charcoal powder can be disperse | distributed by containing water.

  Further, when the charcoal powder is configured to include the first charcoal powder and the second charcoal powder having a particle size of 1 to 2 times the particle size of the first charcoal powder, as described above. Coating surface uniformity, film formability, bendability, surface contamination, surface flaw adhesion, coating conductivity and coating strength improvement, reduction of uneven electrical resistance on coating surface, charcoal particles It is possible to further improve the performance of the coating film, such as the prevention of falling off, the prevention of whitening, the improvement of the adhesive strength of the cloth, and the prevention of precipitation of charcoal powder.

  On the other hand, in the case where the charcoal powder is configured to include the second charcoal powder having a particle size of less than 1 times the particle size of the first charcoal powder, between the charcoal powders having a large particle size, It becomes difficult for charcoal powder having a small diameter to enter, and it becomes difficult to make the filling state of charcoal powder uniform. Along with this, the improvement of the performance of the coating film becomes insufficient. In addition, the particle size of the second charcoal powder is close to the particle size of the first charcoal powder. As a result, the density of the mixed state is lowered, and the coating film strength is insufficiently improved.

  In addition, when the charcoal powder is configured to include the second charcoal powder having a particle size exceeding twice the particle size of the first charcoal powder, there is a gap between the powder particles of the second charcoal powder. It tends to occur, the density of the mixed state is lowered, and the coating film strength is insufficiently improved. Further, unevenness of the surface between the powder particles of the second charcoal powder tends to occur, and it becomes difficult to make the filling state of the charcoal powder uniform. Along with this, the improvement of the performance of the coating film becomes insufficient.

  In addition, when the first charcoal powder is a powder having a center particle size of 5 μm having a mesh size of 3000 mesh or less, and the second charcoal powder is a powder having a center particle size of 10 μm having a mesh size of 1500 mesh or less, the above-described coating is performed. Film surface uniformity, film formability, bendability, surface contamination, surface flaw adherence, paint conductivity and coating film strength improvement, reduction of electrical resistance unevenness on coating film surface, charcoal particle dropping It is possible to further enhance the performance of the coating film, such as suppression of whitening, suppression of whitening, improvement of the adhesive strength of cloth, and suppression of precipitation of charcoal powder. The central particle size used herein may be a central particle size determined by a known particle size measuring instrument or a screening test method defined in JIS8815.

  In addition, when the first charcoal particles are blended within the range of 30 to 100 parts by weight with respect to 100 parts by weight of the second charcoal particles, the uniformity of the coating surface, film formability, flexibility, It is possible to further improve the performance of the coating film such as surface contamination, surface flaw adhesion, paint conductivity, coating film strength, storage stability, and improvement in adhesion strength with the base material.

  On the other hand, when the first charcoal particles are blended in less than 30 parts by weight with respect to 100 parts by weight of the second charcoal particles, the coating film surface uniformity, film formability, flexibility, surface contamination, Insufficient improvement in surface scratch adhesion, paint conductivity, coating film strength, storage stability and adhesion strength with the base material. Further, when the first charcoal particles are blended in excess of 100 parts by weight with respect to 100 parts by weight of the second charcoal particles, the flexibility is deteriorated, the surface contamination is not improved, and the base material and The adhesive strength of the is reduced.

  Moreover, when the blending ratio of the charcoal powder is 30 parts by weight with respect to 100 parts by weight based on the total amount, the application of thickness and strength to the resin and the provision of conductivity to the paint are more sufficient. Become.

  In addition, when the binder is made of a cationic acrylic resin, the electrical connection between the charcoal powder, the surface of which is easily negatively charged, and the cationic acrylic resin works, and the binder and the charcoal powder. It becomes easy to adhere | attach, and a coating-film intensity | strength can be improved. In addition, when the base material to which the paint is applied is, for example, a surface such as concrete or gypsum board that tends to be negatively charged, an electrical connection force acts between the paint and the base material, and the paint Adhesion strength can be improved.

  Moreover, when the flame retardant comprised from aluminum hydroxide is contained, the flame retardance of a coating material can be improved.

  Moreover, when the weight ratio of aluminum hydroxide is in the range of 0.1 to 10% based on the total amount, the flame retardancy of the paint can be further improved.

  On the other hand, when the weight ratio of aluminum hydroxide is less than 0.1% based on the total amount, the flame retardancy function is insufficient. In addition, if the weight ratio of aluminum hydroxide exceeds 10% on the basis of the total amount, the flame retardancy of the paint will be improved, but the amount will be more than necessary, which will adversely affect the production cost and other ingredients. There is a risk.

  In order to achieve the above object, the air purification mechanism of the present invention is an air purification mechanism for charging a coating film surface coated with a conductive aqueous coating composition to a negative voltage by a negative voltage generating means, The water-based coating composition contains a binder composed of a synthetic resin, charcoal powder composed of at least two powders having different particle sizes, and water.

  Here, by containing at least two charcoal powders having different particle sizes, when the paint is applied to the base material, the charcoal powder having a small particle size enters between the charcoal powders having a large particle size. Further, it is possible to improve the uniformity of the charged state of the charcoal particles and improve the filling rate of the charcoal powder per unit area.

  In addition, by electrically charging the coating film surface coated with the conductive aqueous coating composition to a negative voltage by the negative voltage generating means, an electric attractive force is generated on the coating film surface, and the air is surrounded in the air around the coating film surface. Any positively charged particles present can be collected.

In addition, when the coating amount of the aqueous coating composition is within the range of 150 to 300 g / m ² · wet, the coating amount does not become large, for example, using a member such as a roll. When applying to the base material by work, the paint can be applied once or twice.

  In addition, when the voltage generated on the surface of the coating film charged to a negative voltage by the negative voltage generating means is within the range of −100 to −150 V, the electric attractive force on the surface of the coating film becomes sufficient. The efficiency of collecting positively charged particles present in the air around the surface can be increased. For example, in an indoor space surrounded by four wall surfaces and a ceiling surface, the paint is not applied to a plurality of surfaces, but is applied to any one of the one wall surface or the ceiling surface and charged to a negative voltage. The air in the space can be sufficiently purified.

  On the other hand, when the generated voltage on the coating film surface charged to a negative voltage by the negative voltage generating means is less than −100 V, the collection efficiency of positively charged particles existing in the air around the coating film surface is high. May be insufficient. In addition, when the generated voltage on the coating film surface charged to a negative voltage by the negative voltage generating means exceeds −150 V, the required generated voltage of the negative voltage generating means becomes large, As a result, the power cost required for supplying the negative voltage will rise.

  In order to achieve the above object, the air purification method of the present invention includes a binder made of a synthetic resin and at least two particles on at least one of a plurality of wall surfaces or a ceiling surface constituting an indoor space. A step of applying a conductive aqueous coating composition containing charcoal powder composed of powders having different diameters and water, and a step of charging the coating surface coated with the aqueous coating composition to a negative voltage. Is provided.

  Here, when the water-based coating composition contains charcoal powder, the resin can be given thickness and strength. Moreover, electroconductivity can be provided to an aqueous coating material composition. Furthermore, the charcoal powder can adsorb odors, chemical substances, moisture, and the like.

  In addition, when charcoal powder composed of at least two powders having different particle sizes is used, the charcoal powder having a small particle size enters between the charcoal powders having a large particle size when the paint is applied to the base material. Further, it is possible to improve the uniformity of the charged state of the charcoal particles and improve the filling rate of the charcoal powder per unit area. Moreover, the electroconductivity of a water-based coating composition can be improved.

  Moreover, a coating film can be formed on a wall surface or a ceiling surface by applying the water-based coating composition to at least one of a plurality of wall surfaces or a ceiling surface constituting the indoor space. Moreover, not only the wall surface or the ceiling surface is protected by this coating film, but also conductivity can be imparted.

  Moreover, the electrode surface which negatively charged the coating-film surface can be made by the process which charges the coating-film surface with which the aqueous coating material composition was apply | coated to negative voltage. As a result, an electric attractive force is generated on the surface of the coating film surface, and positively charged particles existing in the air around the coating film surface can be collected.

  In order to achieve the above object, the air purification method of the present invention includes an insulating layer provided on at least one of a plurality of wall surfaces or a ceiling surface constituting an indoor space, and a binder made of a synthetic resin. Applying a conductive aqueous coating composition containing charcoal powder composed of at least two powders having different particle sizes and water on the insulating layer; and applying the aqueous coating composition. And charging the coated surface to a negative voltage

  Here, when charcoal powder composed of at least two powders having different particle diameters is applied to the base material, charcoal powder having a small particle diameter enters between the charcoal powders having a large particle diameter. Thus, the uniformity of the charged state of the charcoal particles can be improved, and the charging rate of the charcoal powder per unit area can be improved. Moreover, the electroconductivity of a water-based coating composition can be improved.

  In addition, an insulating layer is provided on at least one surface of a plurality of wall surfaces or ceiling surfaces constituting the indoor space, and a conductive water-based paint composition is applied on the insulating layer, whereby the wall surfaces or the ceiling surface are made conductive. Even when formed with a material having the property, it becomes easy to maintain the negatively charged state of the coating surface. That is, it is possible to suppress the current from flowing to the soil surface side through the wall surface or the ceiling surface and the disappearance of the potential difference generated on the coating film surface.

  Moreover, the electrode surface which negatively charged the coating-film surface can be made by the process which charges the coating-film surface with which the aqueous coating material composition was apply | coated to negative voltage. As a result, an electric attractive force is generated on the surface of the coating film surface, and positively charged particles existing in the air around the coating film surface can be collected.

  Further, when the coating surface of the aqueous coating composition is provided only on any one of the plurality of wall surfaces or the ceiling surface, it is present in the air around the coating surface while reducing the amount of coating used. Positively charged particles can be collected.

The water-based paint composition according to the present invention can form a coating film with excellent quality, and can exhibit a sufficient air purification function for indoor spaces.
Moreover, the air purification mechanism according to the present invention can form a coating film with excellent quality, and can exhibit a sufficient air purification function for the indoor space.
Furthermore, the air purification method according to the present invention can form a coating film with excellent quality, and can exhibit a sufficient air purification function for the indoor space.

It is explanatory drawing which shows the outline of the air purification mechanism which concerns on this invention. It is perspective explanatory drawing which shows the coating-film surface to a base material, and its peripheral structure.

Embodiments of the present invention will be described below with reference to the drawings.
In the present embodiment, with reference to FIG. 1, the position of the floor surface with respect to the ceiling surface 2 is “lower” or “lower”, and the position of the ceiling surface 2 with respect to the floor surface is “upper” or “upward”. To do. Further, with reference to FIG. 2, the direction of the base material 11 a when viewed from the finishing material 7 is referred to as “the base material side”, and the direction of the finishing material 7 when viewed from the base material 11 a is referred to as “the indoor side”.

(Air purification mechanism A)
In the air purification mechanism A which is an example of the air purification mechanism to which the present invention is applied, as shown in FIG. 1, the air purification in the indoor space 3 surrounded by the plurality of wall surfaces 1 and the ceiling surface 2 is performed. In the air purification mechanism A, a coating film surface 41 of the paint 4 to be described later is formed on the wall surface 11, and the negative voltage generator 5 that negatively charges the coating film surface 41 is provided. That is, the air purification mechanism A combines the paint 4 and the negative voltage generator 5 to purify the air in the indoor space 3. The paint 4 is an example of an aqueous paint composition to which the present invention is applied, and the detailed composition thereof will be described later.

(Negative voltage generator 5)
The negative voltage generator 5 has a positive electrode 51 and a negative electrode 52 (see FIGS. 1 and 2), is connected to a predetermined power source 54 (see FIG. 2), and is a coating film surface 41 of the wall surface 11 in wiring contact with the negative electrode 52. Is a device for negatively charging the coating film surface 41 by impressing voltage.

  The state where the tip of the negative electrode 52 is in direct contact with the coating surface 41 and is in contact via an attachment member or the like (not shown) is fixed. Further, the positive electrode 51 is connected to the earth ground 53. The coating surface 41 is applied so as to have an insulation resistance value of 1 MΩ or more with respect to the ground 53 in the ground, and the coating surface 41 can maintain a negatively charged state. An electrically independent state can be maintained. The insulation resistance value is a resistance value between the coating surface 41 and the ground 53 in the ground, and the larger the value, the more easily the coating surface 41 becomes electrically independent. Become. The insulation resistance value includes the presence or absence of an insulating coating applied between the coating surface 41 and the wall surface 11, the presence or absence of an insulating sheet provided between the coating surface 41 and the wall surface 11, and the wall surface 11. It varies depending on the presence or absence of insulation in the material of the foundation structure (frame structure that serves as the skeleton of the wall surface) and the presence or absence of insulation in the material of the plate-like foundation material attached to the foundation structure.

  The negative voltage generator 5 is a device having a device generated voltage of 0 to 300 V, and can mark a reference generated voltage of −100 to −150 V on the coating surface 41. Table 1 shows output voltage characteristics of the negative voltage generator 5 (when 1 MΩ and −100 V are set). The reference generated voltage here corresponds to “generated voltage” in the claims of the present application.

  Here, the surface on which the coating film surface 41 of the coating material 4 is formed is not necessarily limited to the wall surface 11. For example, the coating material 4 is further applied to the wall surface 1 and the ceiling surface 2 other than the wall surface 11. It may be. Moreover, the aspect by which the coating material 4 is apply | coated only to the other wall surface 1 or only the ceiling surface 2 may be sufficient. For example, depending on the size of the indoor space 3, the paint 4 can be applied to the entire surface of the plurality of wall surfaces 1 and the ceiling surface 2 from the viewpoint of sufficient air purification.

In addition, although the paint 4 is one guideline, if it is assumed that the paint 4 is applied only to the ceiling surface 2 in the room, the minimum application area is 0.4 m ^{2 with} respect to the air volume 1 m ^{3 in the} indoor space 3. It will be about. For example, in the case of a general indoor space of 18 帖 (帖 = m ² × 0.3025 × 2) or less, the paint 4 is applied to one surface of the ceiling surface, so that the entire indoor space 3 can be precisely in the air. Charged particles can be collected efficiently. In addition, when the paint 4 is applied only to the wall surface, if the room is wide, the space volume becomes large, and there is a possibility that the minimum required application area may not be secured on one wall surface. According to the size of the indoor space, the air in the indoor space 3 can be sufficiently purified by application to a plurality of wall surfaces.

  In addition, the coating material 4 does not necessarily have to be applied to the entire wall surface 11, and it is sufficient that the surface to which the coating material 4 is applied is negatively charged by the negative voltage generator 5. Therefore, for example, there may be a mode in which the coating material 4 is applied to a part of the wall surface 11 (for example, a certain area range in the wall surface 11) or a plurality of locations (so that there is a space between the application locations). However, from the viewpoint of increasing the efficiency of collecting positively charged particles in the air by acting on the coating surface having a certain area against the air in the indoor space 3, the paint 4 is applied to the entire wall surface 11. It is preferably applied.

  In addition, the width of the indoor space 3 to which the air purification mechanism A is applied is not particularly limited, as long as it has a region such as a wall surface or a ceiling surface to which the paint 4 can be applied, regardless of the size. The air purification mechanism A can be used.

  Moreover, the negative voltage generator 5 does not necessarily need to be configured so that the negative electrode 52 is brought into direct contact with the coating surface 41 and the coating surface 41 is negatively charged. For example, a configuration in which the coating film surface 41 is negatively charged by using a negative charge generator such as an ion generator that can irradiate the coating film surface 41 with a negative charge in a non-contact manner may be employed.

  Further, the device generation voltage of the negative voltage generator 5 need not be limited to the range of 0 to 300V. However, from the viewpoint of sufficiently collecting positively charged particles in the air of the indoor space 3, an aspect in which a reference generated voltage of −100 to −150 V can be marked on the coating surface 41 is adopted. For this purpose, it is preferable to employ a device in which the device voltage of the negative voltage generator 5 is in the range of 0 to 300V. Moreover, the output voltage characteristic of Table 1 mentioned above is only an example of the characteristic with which the negative voltage generator 5 is provided.

(Coating surface 41)
The coating-film surface 41 provided in the wall surface 11 and its peripheral structure are demonstrated using FIG.
The base material 11a constituting the wall surface 11 is a basic body (plate-like body) that forms the coating film surface 41, and is formed of a conductive material such as gypsum board or concrete. Under the base material 11a, a frame-like base structure constituting the skeleton of the wall surface 11 is formed. An insulating layer 6 is provided between the base material 11 a and the coating film surface 41 to prevent leakage from the coating film surface 41 to the base material 11 a side. Moreover, the finishing material 7 for improving the designability is provided on the indoor side from the coating film surface 41.

The coating surface 41 is formed by applying a coating 4 having a composition described later on an insulating layer 6 provided on the indoor side of the base material 11a. The coating amount of the paint 4 is 150 to 300 g / m ² · wet.

  As described above, a voltage is applied from the negative voltage generator 5 to the coating film surface 41, and the coating film surface 41 is negatively charged. That is, the entire coating film surface becomes a negatively charged electrode surface through the conductivity of the coating film surface 41. Here, the insulating layer 6 insulates between the coating surface 41 and the base material 11a in order to maintain the coating surface 41 electrically independent from the ground 53 in the ground.

  The insulating layer 6 has a three-layer structure of a Japanese paper layer on the indoor side, an intermediate layer formed of polyethylene terephthalate, and a Japanese paper layer on the base material side. All of the constituent materials have insulating properties. The insulating layer 6 is affixed to the base material 11a using a cloth (wallpaper) affixing glue.

  In the three-layer structure of the insulating layer 6, it is possible to bond the insulating sheet layer and the base material 11 a using a cross-paste paste by the Japanese paper layer on the base material side. Moreover, the adhesiveness with the coating material 4 is improved with respect to the indoor Japanese paper layer. By using a paper material such as a Japanese paper layer, it is possible to improve the adhesiveness of the paste and the paint 4 as compared to the case of using a resin material such as vinyl.

  Here, the insulating layer 6 does not necessarily have a three-layer structure, and it is sufficient if the insulating property between the coating film surface 41 and the base material 11a can be secured. However, by providing a Japanese paper layer on the front and back surfaces of the insulating layer 6, it is possible to improve the adhesiveness of the paint 4 and the glue for pasting the cloth as described above, so that a three-layer structure including the Japanese paper layer is adopted. It is preferable.

  In addition, the intermediate layer of the insulating layer 6 does not necessarily need to be formed of polyethylene terephthalate, and it is sufficient if it is a material having electrical insulation. For example, an intermediate layer coated with an insulating epoxy-based rust-proof and waterproof paint can also be used.

  The finishing material 7 is a breathable cloth or a color paint having a breathability, and is coated or coated on the paint film surface 41 to have a black paint film surface derived from charcoal powder. It becomes the material which blinds 41. Further, the air-permeable cloth or color paint constituting the finishing material 7 has insulating properties, but when the coating film surface 41 on the base material 11a is charged with a negative voltage, the finishing material 7 is polarized, and the finishing material 7 is finished. Since the surface of the material 7 is negatively charged, positively charged particles in the air in the indoor space 3 can be sucked.

The positively charged particles in the air of the indoor space 3 are very small particles (particles having a particle radius of about 10 ⁻⁷ cm to 10 ⁻⁸ cm), so that the ventilation hole of the finishing material 7 is provided. It passes through and is attracted to the negatively charged coating film surface 41 on the base material 11a.

  In the above description, the case where the base material 11a (or the base structure material) is a steel or concrete non-wooden conductive material has been described. However, the base material and the base structure material have insulating properties such as wooden structures. In the case of this material, a structure excluding the above-described insulating layer 6 can be adopted. That is, the coating material 4 is directly applied to the wall surface of the base material 11a to form the coating film surface 41, and the finishing material 7 is provided thereon. When the base material and the base structure material are insulating materials such as wooden structures, the coating surface 41 is electrically independent from the ground 53 due to the insulating action of the base material and the base structure material. Can be maintained.

  Furthermore, even if the base material is wooden, if a material having conductivity is used for the base structure, or if a metal screw or the like is used to attach the base material to the base structure, the above-mentioned It is preferable to provide such an insulating layer 6.

  In the air purification mechanism A described above, the negative voltage generator 5 is turned on, and the voltage is applied to the coating surface 41 so that the coating surface 41 is electrically independent from the ground 53 in the ground. If it becomes, the coating-film surface 41 will be in the state electrically charged negatively. If the negative voltage generator 5 is left on, the paint film surface 41 attracts particles of positively charged harmful substances and unpleasant substances in the air of the indoor space 3 as negatively charged electrode surfaces. Collect particles. As a result, the air in the indoor space 3 can be purified.

  Hereinafter, the composition of an example of the aqueous coating composition to which the present invention is applied will be described. It is an example of a composition of the coating material 4 mentioned above.

In the paint (paint 4) shown here, the weight ratio based on the total amount in the paint composition is a cationic acrylic ester copolymer aqueous emulsion (Movinyl 7820 (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.)): 29. 07%, water: 29.07%, 1500 mesh charcoal powder (center particle size 10 μm): 19.38%, 3000 mesh charcoal powder (center particle size 5 μm): 9.69%, aluminum hydroxide: 4. 84%, acrylic polymer (Thickener 615 (manufactured by Sanyo Chemical Industries, Ltd.): 2.91%, preservative (Amorden FS-14D (manufactured by Yamato Chemical Co., Ltd.)): 2.91%, urethane Modified polyether (Thickener 660T (manufactured by Sanyo Chemical Industries, Ltd.)): 1.94%, fungicide (PBM-DS (manufactured by MIC Corporation): 0.10%, silicone Foam (Aqualene HS-01 (Kyoei) (The product made by company chemical Co., Ltd.): It has a composition containing 0.01%, and the paint of this composition has a viscosity of 0.83 Pa · s and a density of 1.623 g / cm ³ .

  A cationic acrylic ester copolymer aqueous emulsion (Movinyl 7820 (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.)) is a binder, and as a main component of the coating film, the particles of charcoal powder are connected to each other. A film is formed. This aqueous acrylate copolymer emulsion is an aqueous emulsion comprising about 45% of an acrylate copolymer, the remainder being composed of water, and a glass transition temperature (Tg) of 4 ° C.

  Water is a solvent for mixing and dispersing each component. Water is also the base of the paint.

  The 1500 mesh charcoal powder (center particle size 10 μm) and the 3000 mesh charcoal powder (center particle size 5 μm) are aggregates (inorganic pigments) that give the resin (coating film) thickness and strength, and are applied to the paint. Gives conductivity. Further, the charcoal powder imparts a function of adsorbing odors, chemical substances, moisture and the like to the paint.

  In this paint, two types of charcoal powders having different particle diameters are blended, and the ratio of the values of the central particle diameters is such that the particle diameter is large and the particle diameter is small = 2: 1. The mixing ratio of the two types of charcoal powder is 50 parts by weight of charcoal powder having a small particle size with respect to 100 parts by weight of charcoal powder having a large particle size. Furthermore, in this paint, the total blending ratio of the two types of charcoal powder with respect to the total amount of the paint is 30 parts by weight of the two types of charcoal powder with respect to 100 parts by weight of the total amount of the paint.

  Moreover, the 1500-mesh and 3000-mesh charcoal powders are white charcoal baked at around 1000 ° C. using a tree belonging to the genus Hypericaceae (Mytune, no Japanese name). The charcoal powder is, for example, white charcoal produced by baking Umegamegashi at a high temperature of 900 to 1400 ° C., preferably 1000 to 1200 ° C., followed by quenching with an appropriate amount of ash and soil. A typical example of white charcoal is Bincho charcoal.

  Aluminum hydroxide is a flame retardant for improving the flame retardancy of a paint. Aluminum hydroxide is an agent that undergoes a dissociation reaction of crystal water at a temperature of 200 ° C. or higher and produces an endothermic effect during the dissociation reaction.

  Acrylic polymer (Thickener 615 (manufactured by Sanyo Chemical Industries), Ltd.) and urethane-modified polyether (Thickener 660T (manufactured by Sanyo Chemical Industries, Ltd.)) are thickeners for adjusting the viscosity of the paint. Each thickener is mainly composed of an acrylic polymer or urethane-modified polyether.

  Antiseptic (Amorden FS-14D (Daiwa Chemical Industry Co., Ltd.)) is an antiseptic for emulsions and water-based paints that provide antiseptic properties against bacteria and fungi. MIC Co., Ltd. is a fungicide that provides antiseptic properties against mold, and a silicone-based antifoaming agent (Aqualen HS-01 (manufactured by Kyoeisha Chemical Co., Ltd.)) suppresses foaming in the paint. It is an antifoaming agent for water-based paints.

  Here, in this coating material, each compounding raw material and a compounding ratio are not limited to what was mentioned above, Each component and compounding quantity can be suitably changed in the range which does not deviate from the function calculated | required by this invention. One example is described in detail below.

  In the present coating material, a synthetic resin having a coating film forming ability other than a cationic acrylic ester copolymer aqueous emulsion (Movinyl 7820 (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.)) is adopted as a binder. be able to. For example, the types of synthetic resins include acrylic silicon, modified silicon resin, amino alkyd resin, epoxy resin, chlorinated rubber resin, silicon resin, vinyl resin, fluorine resin, phenol resin, phthalic acid resin, unsaturated resin, in addition to acrylic resin Polyester resin, polyurethane resin, etc. can be employed.

  As the acrylic resin paint, for example, emulsion type acrylic resin, acrylic lacquer, baking acrylic, water-soluble acrylic, acrylated alkyd and the like can be adopted. In particular, emulsion acrylic resins are emulsion polymers obtained by emulsion polymerization of monomers such as acrylates in water, which are frequently used in building interior materials.

  Here, the binder of the present paint does not necessarily need to be a cationic acrylic ester copolymer aqueous emulsion. However, since the binder is cationic, in the coating material, the adhesive force between the charcoal powder whose particle surface is negatively charged and the binder can be improved, and the coating strength can be improved. In addition, when the base material to which the paint is applied is a material such as concrete or gypsum board that tends to be negatively charged, an electrical connection force acts between the paint and the base material, and the paint adheres. Strength can be improved and a strong coating film can be formed. Since there is an advantage based on such electrical characteristics, a cationic acrylic resin is preferably employed as the binder.

  In addition, the binder of the present paint does not necessarily have a glass transition temperature (Tg) of 4 ° C. However, by using a binder having a low glass transition temperature, the environmental temperature for applying the paint tends to be lower than the glass transition temperature of the binder, and the generation of shrinkage stress between the coating film and the base material is suppressed. It becomes difficult for the adhesiveness to the base material to fall. Therefore, the glass transition temperature of the binder is preferably a low value of about 10 ° C. or less, for example. In the indoor environment, the lowest indoor temperature is usually about 5 ° C. at the lowest, so if the glass transition temperature of the binder is 4 ° C., sufficient adhesion of the coating can be secured. it can.

  Further, the charcoal powder of the present paint is not necessarily limited to white charcoal, and white charcoal and black charcoal can be mixed and used. However, since black charcoal is charcoal baked at low temperature, the conductivity is low, and when the powder is blended into the paint, the conductivity of the coating film itself is lowered. From the viewpoint of improving the conductivity, the charcoal powder is It is preferably composed of white coal. Further, from the viewpoint of improving the physical properties, flexibility, and filling rate of the coating film, it is also conceivable to use a mixture of white coal and black coal. In that case, it is preferable from a viewpoint of improving electroconductivity to mix | blend the powder of white coal with a smaller particle diameter with the powder of black coal.

  Moreover, the raw material of charcoal powder does not necessarily need to be limited to a tree of the genus Hypericaceae (Amanu, no Japanese name). For example, known raw materials that become white coal, such as Umegashi, Arakashi, oak, and hoo, can be employed. Black coal can be used as raw materials such as oak, kunugi, konara, mizunara and pine.

  Moreover, the aggregate (inorganic pigment) of the present paint is not necessarily limited to charcoal powder, and any material that can ensure a sufficient filling rate and uniformity in the resin can be adopted as the aggregate. For example, powders of minerals such as rocks and clay, powders obtained by pulverizing shells, powders of activated carbon, and the like can be employed. However, in addition to providing thickness and strength to the paint, it also has the ability to adsorb harmful substances and unpleasant substances as adsorbents, easy to obtain raw materials, and uniformity in powder paints with different particle sizes. From the viewpoint of being easily raised, it is preferable to employ charcoal powder as the aggregate.

  In addition, the charcoal powder of the present paint is not necessarily limited to two types having different particle diameters. For example, three or more types of charcoal powder having different particle diameters (center particle diameters) may be blended. . However, it is preferable to employ two types of charcoal powders having different particle diameters from the viewpoint that the control of uniformizing the coating film by adjusting the blending amount becomes complicated and the manufacturing cost becomes high.

  In addition, the charcoal powder of the present paint does not necessarily need to contain two types having different particle diameters, and the ratio of the values of the central particle diameters need not be limited to large particle diameter: small particle diameter = 2: 1. However, from the viewpoint of improving the uniformity of the coating film, the ratio of the values of the central particle sizes in the two types of charcoal powder is preferably large particle diameter: small particle diameter = 1-2: 1, more preferably From the point of further improving the uniformity of the coating film, it is even more preferable that the particle size is large: the particle size is small: 2: 1. preferable.

  In addition, the two types of charcoal powders having different particle sizes of the present paint are not necessarily 1500 mesh charcoal powder (center particle size 10 μm) and 3000 mesh charcoal powder (center particle size 5 μm). For example, an embodiment in which the charcoal powder having a large particle diameter is 3000 mesh and the charcoal powder having a small particle diameter is 6000 mesh is also conceivable. However, the point that it becomes easy to make the filling state of the charcoal powder in the paint easy, the point that the filling rate of the charcoal powder per unit area is easy to improve, and the amount of the binder (resin) necessary for the formation of the coating film are Two types of charcoal powders with different particle sizes are 1500 mesh charcoal powder (center particle size 10 μm) and 3000 mesh charcoal powder (center particle size 5 μm) in terms of blending amount that can ensure flame retardancy. It is preferable to become.

  In addition, the blending ratio of the two types of charcoal powders having different particle sizes of the paint is not necessarily limited to 50 parts by weight of the charcoal powder having a small particle size with respect to 100 parts by weight of the charcoal powder having a large particle size. . However, the charcoal powder having a small particle size is blended in the range of 30 to 100 parts by weight with respect to 100 parts by weight of the charcoal powder having a large particle size from the viewpoint of increasing the filling rate of the charcoal powder per unit area of the coating film. Preferably, from the viewpoint of further increasing the filling rate of the charcoal powder, it is more preferable that 50 parts by weight of the charcoal powder having a small particle diameter is blended with 100 parts by weight of the charcoal powder having a large particle diameter.

  In addition, in this paint, the total blending ratio of the two types of charcoal powder relative to the total amount of the paint is limited to 30 parts by weight of the two types of charcoal powder with respect to 100 parts by weight of the total amount of the paint. is not. It is sufficient if the coating film can be formed and the coating film surface on which the voltage is applied has conductivity that can maintain a negatively charged state. However, from the viewpoint of ensuring the uniformity of the coating film and good electrical conductivity, the total blending ratio of the two types of charcoal powder relative to the total amount of the paint is 2 types of charcoal with respect to 100 parts by weight of the total amount of the paint. The powder is preferably 30 parts by weight.

  Further, it is not always necessary to mix aluminum hydroxide with the paint. However, it is preferable that aluminum hydroxide is blended in the paint from the viewpoint that the flame retardancy of the paint film surface of the paint can be improved.

  In addition, the amount of aluminum hydroxide in the present paint is not necessarily limited to 4.84% by weight based on the total amount of the paint. However, from the viewpoint of improving the flame retardancy of the paint film surface, the blending amount of aluminum hydroxide is preferably within a range of 0.5 to 10% by weight based on the total amount of the paint. From the viewpoint of imparting flame retardancy, the amount of aluminum hydroxide is more preferably in the range of 4.0 to 6.0% by weight based on the total amount of paint.

  Moreover, in the water-based coating composition to which the present invention is applied, it is possible to add other components as necessary within the range not departing from the effects of the present invention, as appropriate, in addition to the composition described above. For example, additional components that improve the functionality of the paint, such as thickeners, preservatives, fungicides, antifoaming agents, and flame retardants, can be added separately.

  The paint 4 which is an example of the aqueous paint composition to which the present invention is applied as described above is a coating film surface uniformity, film formability, flexibility, surface contamination, surface flaw adhesion, paint conductivity, coating It is excellent in the performance of the coating film, such as improvement in film strength, storage stability and adhesion strength with the base material.

  In addition, by applying a voltage to the paint 4 via the negative voltage generator 5, the coating surface becomes negatively charged, and positively charged particles in the air around the coating surface are collected. Thus, the air in the indoor space can be purified.

  As described above, the water-based paint composition, the air purification mechanism, and the air purification method to which the present invention is applied can form a coating film with excellent quality and exhibit a sufficient air purification function for indoor spaces. Is possible.

  Examples of the present invention will be described below.

The sample of the Example and comparative example of the coating material to which this invention was applied was produced, and the following evaluation was performed.
(1) Raw material component of sample First, the raw material component was added so that it might become a composition shown in Table 2 thru | or Table 6, and each sample of Examples 1-6 and Comparative Examples 1-5 was produced. In the following, the numerical values shown in Tables 2 to 6 indicate the weight ratio (%) based on the weight (kg) of the raw material and the total amount of the raw material. Moreover, Examples 1-3 and Comparative Examples 1-3 are the compositions which assumed the coating material at the time of apply | coating by hand using a roll etc. to a base material, In addition to the water | moisture content contained in the acrylic resin used as a binder Separately, the viscosity is adjusted by adding water. In addition, Examples 4 to 6 and Comparative Examples 4 and 5 are compositions assuming a coating material when applied by a coating machine such as a roll coater, and water is added in addition to water contained in the acrylic resin serving as a binder. It is the composition which adjusted the viscosity without doing.
Table 7 shows the results of various tests of Test Nos. 1 to 12 described below for Examples 1 to 3 and Comparative Examples 1 to 3. Table 8 shows the results of various tests of Test Nos. 1 to 11 described below for Examples 4 to 6 and Comparative Examples 4 and 5.

(2) Viscosity (Test No. 1)
About Examples 1-6 and Comparative Examples 1-5, the viscosity (Pa * s) was measured using TVC-5 type viscometer (made by Toki Sangyo Co., Ltd.). The measurement was performed three times for each sample under a temperature condition of 25 ° C. ± 2 and the average value of the three measurements was taken as the measurement result. As for the measurement results, the appropriate viscosity range is set to 0.5 to 5.0 Pa · s for paints for manual painting (roll coating), and the appropriate viscosity range is set to 10 for paints for machine coating. The sample was evaluated at a setting of ~ 100 Pa · s.

  In all of Examples 1 to 3, the viscosity was a value in the range of 0.8 to 2.4 Pa · s, which was a value in a numerical range of an appropriate viscosity for a paint for manual painting. In all of Examples 4 to 6, the viscosity was a value in the range of 31 to 82 Pa · s, which was a numerical range of an appropriate viscosity in a paint for machine coating.

(3) Density (charcoal solid filling rate) (test number 2)
About Examples 1-6 and Comparative Examples 1-5, the weight per unit volume was measured and the density (g / cm < ³ >) was confirmed. A sample was put into an acrylic container having a container size of 100 mm × 100 mm × 100 mm, the surface was scraped with a scraper, the weight was measured, and the density was calculated by the volume of the mass. The measurement was performed three times for each sample under a temperature condition of 25 ° C. ± 2, and the average value of the three measurements was taken as the measurement result. As for the measurement results, those having a density of 1.5 g / cm ³ or more were evaluated as paints having a good charcoal solid filling rate.

In all of Examples 1 to 6, the density value was 1.5 g / cm ³ or more and had a good charcoal solid filling rate.

(4) Storage stability (Test No. 3)
About Examples 1-6 and Comparative Examples 1-5, after stirring a sample, the container was made stationary and the presence or absence of the charcoal powder precipitation to the container bottom after progress for a required time was confirmed. Using a plastic spatula (width 2 cm, thickness 2 mm), the presence of charcoal precipitation at the bottom of the container was examined. Evaluation was performed under the temperature condition of 25 ° C. ± 2. In addition, samples after 1 hour, 24 hours and 72 hours after rest were confirmed. The test results show no precipitation (indicated by ○ in Tables 7 and 8), no precipitation of charcoal powder is observed at the bottom of the container, but an increase in viscosity can be confirmed (indicated by Δ in Tables 7 and 8), and Evaluation was made in three stages, in which a separated precipitate of charcoal powder was observed at the bottom of the container (denoted by x in Tables 7 and 8).

  In all of Examples 1 to 6, no precipitation of charcoal powder was confirmed at all times.

(5) Film formability (dispersion degree) (test number 4)
About Examples 1-6 and Comparative Examples 1-5, the dispersibility (micrometer) of the charcoal powder in the coating material in each sample was measured, and it was set as film forming evaluation. The degree of dispersion was measured according to the method of JIS K 5600-2-5. A 100 μm particle size gauge was used to measure the degree of dispersion. The measurement was performed three times for each sample under a temperature condition of 25 ° C. ± 2, and the average value of the three measurements was taken as the measurement result. As for the measurement results, those having an average value of 50 μm or less were evaluated as paints having good dispersion of charcoal powder, that is, good film formability.

  In all of Examples 1 to 5, the measurement result was 50 μm or less.

(6) Bending resistance (test number 5)
About Examples 1-6 and Comparative Examples 1-5, each sample was apply | coated to the base material, the load was applied after drying, the presence or absence of the generation | occurrence | production of a crack was confirmed, and it was set as evaluation of bending resistance (coating-film strength). Each sample of 3 patterns (150g / m ³ , 300g / m ³ and 450g / m ³ ) was applied to a belt-shaped substrate (width 5cm, length 20cm, made of polypropylene) and dried for 7 days Place a 5mm support in the center of the substrate and fold the substrate at 180 ° C over 2 seconds. After bending, the presence or absence of cracks in the center of the substrate was confirmed. The test results were evaluated without cracks (indicated by ◯ in Tables 7 and 8) and with cracks (indicated by x in Tables 7 and 8).

In Examples 1, 2, 4, and 5, no crack was observed in any of the three patterns. In Example 3, generation of cracks was not observed at the prescribed amounts of two patterns (150 g / m ³ and 300 g / m ³ ). In Example 6, no crack was observed at a coating amount of 150 g / m ³ .

(7) Conductivity (test number 6)
About Examples 1-6 and Comparative Examples 1-5, after apply | coating each sample to a base material and drying, coating-film resistance value (kohm) using a digital multimeter (Sanwa Electric Instruments Co., Ltd. product, RD700). ) Was measured to evaluate conductivity. The specified amount of 8 patterns (100g / m ³ , 150g / m ³ , 200g / m ³ , 250g / m ³ , 300g / m ³ , 350g / m ³ , 400g / Each sample of m ³ and 450 g / m ³ ) was applied and dried for 7 days, and then the resistance value of the surface of the substrate was measured. The measurement was performed five times for each sample under a temperature condition of 25 ° C. ± 2 and the average value of the five measurements was taken as the measurement result. Moreover, about the measurement result, the thing whose average value of a measured value is 3 k (ohm) or less was evaluated as the coating material (coating amount) which has appropriate electroconductivity. In addition, a coating-film resistance value is a numerical value used as the parameter | index of the ease of the electricity flow in a coating-film surface, and it is what was excellent in the electroconductivity of a coating-film surface, so that this value is small.

In Examples 1, 2 and 4, the average value of the measured values in the range of coating weight of 300g / m ³ ~450g / m ³ becomes 3kΩ less. In Examples 3 and 5, the average value of the measured values in the range of coating weight of 350g / m ³ ~450g / m ³ becomes 3kΩ less.

(8) Adsorbability (test number 7)
For Examples 1 to 6 and Comparative Examples 1 to 5, each sample was applied to a substrate and dried, and then contacted with an adsorption target gas (ammonia, formaldehyde, toluene) for 10 minutes in a test container, and initial adsorption to the target gas. The adsorptivity was evaluated by measuring the property (%). A sample (100 mm × 100 mm, made of polypropylene) was coated with a specified amount (300 g / m ³ ) of each sample and dried for 7 days to obtain a test piece. Further, a 4 L glass container was filled with the gas to be adsorbed, the test piece was placed in the container, and the gas concentration in the container after 10 minutes was measured. The gas concentration was measured using a gas detector and a gas detector tube manufactured by Gastec Corporation. The adsorptivity was expressed as a reduction rate (%) before and after placing the test piece in the container. The measurement was performed three times for each sample under a temperature condition of 25 ° C. ± 2, and the average value of the three measurements was taken as the measurement result. In addition, regarding the measurement results, ammonia and formaldehyde with an average value (reduction rate) of 80% or more, and toluene with 40% or more are paints with good initial adsorptivity to the target adsorption gas. Evaluated that there was.

  Examples 1 to 6 all showed good adsorptivity to all target gases.

(9) Moisture absorption and release (test number 8)
For Examples 1 to 6 and Comparative Examples 1 to 5, each sample was applied to a substrate and dried, then held for 24 hours in a dry or wet environment, and moisture absorption was determined from the amount of change in substrate weight before and after holding. The amount released was evaluated. A sample (100 mm × 100 mm, made of polypropylene) was coated with a specified amount (300 g / m ³ ) of each sample and dried for 7 days to obtain a test piece. Moreover, the test piece was hold | maintained for 24 hours in each environment of dry environment (room temperature 25 degreeC, humidity 50%) or wet environment (room temperature 25 degreeC, humidity 90%). The test piece was measured for weight (g) before and after holding. The change in the weight of the test piece before and after holding was calculated, and the value of the change in the weight of the test piece held in the dry environment was taken as the moisture release amount (g / m ² ). Moreover, the weight change of the test piece before and after holding was calculated, and the value of the weight change of the test piece held in a wet environment was taken as the water absorption amount (g / m ² ). In addition, regarding the measurement results of moisture release and moisture absorption, those having a weight change value of 15 g / m ² or more were evaluated as paints having good moisture absorption and release (humidity control).

In all of Examples 1 to 6, the water release amount and the water absorption amount were 15 g / m ² or more, and the water absorption and release amount was favorable.

(10) Adhesive strength (test number 9)
For Examples 1 to 6 and Comparative Examples 1 to 5, each sample was applied to a substrate and dried, or after drying, further held in a humid environment for 24 hours, a tensile test was performed, and the adhesion strength of the coating film Evaluated. If the adhesion strength of the coating film is high, it can be said that the adhesion of the coating material to the base material and the followability to the base material are good. Apply the specified amount (300g / m ³ ) of each sample to the base material (100mm x 100mm, gypsum board) and dry it for 7 days. Let the dried sample be "Dry (test piece)" for 7 days. What was kept for 24 hours in each environment of a humid environment (room temperature 25 ° C., humidity 90%) after drying was defined as “high humidity environment (test specimen)”. For each test piece, a metal attachment is bonded to the test piece via an epoxy resin as an adhesive, and metal is used using a Kenken-type adhesive strength tester (LPT-400, manufactured by Oxjack Co., Ltd.). A tensile test of the attachment was performed, and the load (kg / cm ² ) when the coating film was broken or when the test piece was damaged was measured. The measurement was performed under a temperature condition of 25 ° C. ± 2. As for the measurement results, those having a measured value of 15 kg / cm ² or more were evaluated as paints having good adhesion strength to the base material (base adhesion, base followability).

Example 1 showed an adhesion strength of 15 kg / cm ² or more both in the dry and high humidity environments. In addition, Examples 2 to 6 exhibited adhesion strengths (base adhesion, base followability) of 15 kg / cm ² or more when dried.

(11) Surface contamination (test number 10)
About Examples 1-6 and Comparative Examples 1-5, after apply | coating each sample to a base material and drying, it is further hold | maintained for 24 hours in a humid environment after drying, a dough contamination test is performed, surface contamination property is checked. evaluated. Apply the specified amount (300 g / m ³ ) of each sample to the base material (200 mm × 200 mm, gypsum board), and dry for 7 days. The dried sample is called “Dry (test piece)” for 7 days. What was kept for 24 hours in each environment of a humid environment (room temperature 25 ° C., humidity 90%) after drying was defined as “high humidity environment (test specimen)”. For each test piece, a white dough was placed on the surface of the test piece, a weight of 100 g was placed thereon, and the dough was pulled to check whether the dough was dirty. The test results were evaluated without contamination (indicated by ◯ in Tables 7 and 8) and with contamination (indicated by x in Tables 7 and 8).

  In Examples 1, 2, 4 and 5, no adhesion of dirt to the fabric was confirmed in both the dry and high humidity environments. In Examples 3 and 6, no dirt was confirmed on the fabric during drying.

(12) Surface scratch adhesion (test number 11)
About Examples 1-6 and Comparative Examples 1-5, each sample was apply | coated to the base material, the damage | wound adhesion test to the coating film by material | dough was done after drying, and surface damage | wound adhesiveness was evaluated. A specified amount (300 g / m ³ ) of each sample was applied to a base material (200 mm × 200 mm, gypsum board), dried for 7 days, and the dried sample was used as a test piece. For each test piece, place a white fabric on the surface of the test piece, place a 100 g weight on it, pull the fabric, and the friction between the fabric and the coating surface will cause scratches on the coating surface. The presence or absence of occurrence was confirmed. The test results were evaluated with no flaw adhesion (shown as ◯ in Tables 7 and 8) and with flaw adhesion (shown as x in Tables 7 and 8).

  In all of Examples 1 to 6, adhesion of scratches was not confirmed.

(13) Flame retardancy (test number 12)
About Examples 1-3 and Comparative Examples 1-3, each sample was apply | coated to the base material, the flammability test was done after drying, and the flame retardance was evaluated. A specified amount (300 g / m ³ ) of each sample was applied to a base material (15 cm × 30 cm, gypsum board), dried for 7 days, and the dried sample was used as a test piece. For each test piece, install a burner at a position 20 cm away from the test piece, add fire to the burner, stop the fire after 2 minutes, cause damage on the coating surface of the test piece, smoke and gas The occurrence of was confirmed. The test results showed that there was no damage on the coating surface, no smoke / gas generation (indicated by circles in Tables 7 and 8), and there was damage on the coating surface or smoke / gas generation (table 7 and Table 8).

  In all of Examples 1 to 3, generation of damage on the surface of the coating film and generation of smoke and gas were not confirmed.

(12) Evaluation of flame retardancy by blending amount of aluminum hydroxide Based on the composition of Example 2 described above, the blending amount of aluminum hydroxide was varied (0%, 0.5%, 1%, 2.5%, 5 %, 7.5%, 10%, 12.5%)) were prepared and used as Examples 7-14. This example is a test similar to the above-mentioned flame retardancy (test number 12), and after adding fire to the burner, the coating on each test piece 30 seconds later, 1 minute later and 2 minutes later The occurrence of damage on the surface and the generation of smoke and gas were confirmed. The test results show that there was no damage on the coating surface, no smoke or gas (circled in Table 9), slight damage on the coating surface, or generation of smoke or gas ( In Table 9, it was evaluated by Δ), and the occurrence of damage on the surface of the coating film and the occurrence of smoke / gas (indicated by x in Table 9). The results are shown in Table 9 below.

  In any of Examples 11 to 14, even after 2 minutes, no damage on the surface of the coating film, nor generation of smoke or gas was confirmed.

DESCRIPTION OF SYMBOLS 1 Wall surface 11 Wall surface 11a Base material 2 Ceiling surface 3 Indoor space 4 Paint 5 Negative voltage generator 51 Positive electrode 52 Negative electrode 53 Ground 54 Power supply 6 Insulating layer 7 Finishing material

Claims (16)

A binder composed of synthetic resin;
The first charcoal powder is composed of at least two powders having different particle sizes, the first charcoal powder is a powder having a center particle size of 5 μm having a mesh size of 3000 mesh or less, and the second charcoal powder is a powder having a center particle size of 10 μm having a mesh size of 1500 mesh or less Charcoal powder that is
A water-based coating composition containing water. The water-based paint composition according to claim 1, wherein the first charcoal particles are blended within a range of 30 to 100 parts by weight with respect to 100 parts by weight of the second charcoal particles . The water-based paint composition according to claim 1 or 2, wherein a blending ratio of the charcoal powder is 30 parts by weight with respect to 100 parts by weight based on the total amount . The binder is composed of a cationic acrylic resin.
The water-based paint composition according to claim 1, claim 2 or claim 3. The water-based paint composition according to claim 1, 2, 3, or 4 containing a flame retardant composed of aluminum hydroxide . The water-based coating composition according to claim 5, wherein the aluminum hydroxide has a weight ratio in the range of 0.1 to 10% based on the total amount . A binder composed of a cationic acrylic resin;
  Charcoal powder composed of at least two powders of different particle sizes;
Contains water
Water-based paint composition. A binder composed of synthetic resin;
  Charcoal powder composed of at least two powders of different particle sizes;
  water and,
  Contains a flame retardant composed of aluminum hydroxide
  Water-based paint composition. An air purification mechanism for charging a coating film surface coated with a conductive aqueous coating composition to a negative voltage by a negative voltage generating means,
The water-based paint composition contains a binder composed of a synthetic resin, charcoal powder composed of at least two powders having different particle sizes, and water. The air purification mechanism according to claim 9, wherein the coating amount of the water-based coating composition is within a range of 150 to 300 g / m ² · wet. The air purification mechanism according to claim 9 or 10, wherein a generated voltage on a coating film surface charged to a negative voltage by the negative voltage generating means is in a range of -100 to -150V. The said charcoal powder was comprised including the 1st charcoal powder and the 2nd charcoal powder which has a particle size 1 to 2 times the particle size of this 1st charcoal powder. Or the air purification mechanism of Claim 11. Conductivity containing at least one surface of a plurality of wall surfaces or ceiling surfaces constituting an indoor space containing a binder composed of synthetic resin, charcoal powder composed of at least two powders having different particle sizes, and water Applying a water-based paint composition of
An air purification method comprising: charging a coating film surface coated with the aqueous coating composition to a negative voltage. An insulating layer is provided on at least one of a plurality of wall surfaces or ceiling surfaces constituting the indoor space, a binder composed of a synthetic resin, charcoal powder composed of at least two powders having different particle sizes, and water A step of applying a conductive aqueous coating composition containing the composition on the insulating layer;
An air purification method comprising: charging a coating film surface coated with the aqueous coating composition to a negative voltage. The said charcoal powder was comprised including the 1st charcoal powder and the 2nd charcoal powder which has a particle size 1 to 2 times the particle size of this 1st charcoal powder. The air purification method as described in 2. The air purification method according to claim 13, 14 or 15, wherein a coating surface of the water-based paint composition is provided only on any one of the plurality of wall surfaces or ceiling surfaces.