JPWO2018229850A1 - Aqueous paint composition, air purification mechanism and air purification method - Google Patents

Abstract

An aqueous paint composition, an air purification mechanism, and an air purification method capable of forming a coating film excellent in quality and capable of exhibiting a sufficient air purification function to indoor space are provided. A water-based paint composition has a weight ratio based on the total amount in the paint composition, the cationic acrylic acid ester copolymer aqueous emulsion: 29.07%, water: 29.07%, 1500 mesh charcoal powder (Central particle size 10 μm): 19.38%, 3000 mesh charcoal powder (central particle size 5 μm): 9.69%, aluminum hydroxide: 4.84%, acrylic polymer: 2.91%, preservative It has a composition including: 2.91%, urethane-modified polyether: 1.94%, antifungal agent: 0.10%, and silicone antifoaming agent: 0.01%. [Selected figure] 1

Description

  The present invention relates to an aqueous coating composition, an air purification mechanism and an air purification method. Specifically, the invention relates to an aqueous coating composition capable of forming a coating film excellent in quality and capable of exhibiting a sufficient air purification function to indoor space, an air purification mechanism, and an air purification method. .

  Background Art A paint applied to the surface of an object is used for the purpose of protecting the object and for the purpose of imparting beauty and functionality. The objects to which the paint is applied include a building, a vehicle, an electric machine, a metal product, furniture, a leather, etc., and a wide variety of paints exist for each application.

  In addition, among the uses of paints, paints for building interiors, especially for building interiors applied to wall surfaces and ceilings in indoor spaces, not only improve the coating surface protection and design, but also improve the indoor space environment. To contribute. The paint for interiors of buildings is mainly composed of synthetic resin, pigment, additives and solvent.

  The paint that contributes to the environmental improvement of such indoor spaces includes, for example, dust and dirt in indoor spaces, chemical substances such as formaldehyde and volatile organic compounds (VOC) contained in furniture and building materials, odors of cigarettes, pets, etc. Have the ability to reduce or adsorb harmful substances and unpleasant substances.

  Among these, as a paint that attempts to efficiently adsorb harmful substances in air in the indoor space, for example, there is an aqueous paint composition described in Patent Document 1.

  The water-based paint composition described in Patent Document 1 is a paint for obtaining a coating film for building interior, and comprises a surfactant and a carboxyl group copolymerizable with an α, β-ethylenically unsaturated monomer. A water-based resin dispersion (A) containing, as an essential component, an ethylenically unsaturated monomer having a copolymerized 0.5% by mass to 10% by mass of an ethylenically unsaturated monomer having a carbonyl group excluding a carboxyl group, It contains a compound (B) having two or more hydrazide groups in the molecule, and activated carbon (C). This paint adsorbs harmful substances by activated carbon.

  Further, there is a case where a paint containing a conductive component in a paint composition is used for an air purification mechanism of an indoor space. For example, the inventors of the present application use and develop a paint containing charcoal powder having conductivity.

  The paint having this conductivity purifies air in the indoor space and the like by capturing positively charged particles in air in the indoor space. For example, waste gases and particulate matter such as PM 2.5 tend to be positively charged in the atmosphere and their constituent particles. Also, ammonium ions are mainly present in the air. A negative voltage generator is connected to the coating surface of the conductive paint, and the coating surface is charged to a negative voltage to capture positively charged particles as described above. It is possible to purify the air in the space.

JP, 2010-174184, A

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

  In particular, the quality and performance of the coating film are affected by the particle size of the inorganic pigment (aggregate) composed of the powder of minerals, shells, charcoal, activated carbon and the like contained in the paint. For example, when charcoal powder is used as an inorganic pigment, if the particle size of charcoal powder is large, unevenness occurs in the coating film, the smoothness is impaired, dropping of charcoal powder, precipitation of charcoal powder in paint Occurs.

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

  In addition, for the above-described coatings to which conductivity has been imparted, paints containing aqueous or alcoholic solvents (water-based paint compositions or alcoholic paint compositions) are mainly used, but there are disadvantages caused by the respective solvents. there were.

  First, as a premise, in the paint to which conductivity has been imparted, particles of charcoal powder in the paint are in contact with each other, and the conductivity of the paint is secured via the particles.

  Here, the water-based paint composition contains a large amount of the synthetic resin necessary for forming a coating film containing charcoal powder, as compared with the alcoholic paint composition, and the resin layer becomes thicker. When the blending amount of the synthetic resin is large, the contact of the particles of the charcoal powder is likely to be disturbed, 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 paint film surface of the paint.

  On the other hand, the alcoholic coating composition is superior in conductivity to the aqueous coating composition because the amount of the synthetic resin necessary for forming a coating film containing charcoal powder is smaller and the resin layer becomes thinner. There is. However, in the 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 easily cracked in accordance with the deformation of the base and the like.

  There is a problem that the portion of the coating film where the crack has occurred becomes an electrically discontinuous region, and the conductivity of the coating also decreases. In addition, main alcoholic solvents such as ethanol, methanol and 1-propanol are volatile organic compounds (VOCs), which cause health damage to the human body. There is a demand to replace it. As described above, in the case of the paint provided with the conventional conductivity, the conductivity, the coating film performance, and the safety become insufficient.

  The present invention has been made in view of the above points, is capable of forming a coating film excellent in quality, and is capable of exhibiting a sufficient air purification function for indoor space, and an aqueous paint composition. It is an object of the present invention to provide an air purification mechanism and an air purification method.

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

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

  Charcoal powder functions as an aggregate that gives the resin thickness and strength, and imparts conductivity to the water-based paint composition. Furthermore, charcoal powder adsorbs odors, chemical substances, moisture and the like.

  In addition, because the charcoal powder is composed of at least two different particle sizes, when the paint is applied to the base material, the charcoal powder having a small particle size is located between the charcoal particles having a large particle size. It is possible to enhance the uniformity of the packing state of charcoal particles and to improve the packing rate of charcoal powder per unit area. In addition, a foundation | substrate material means the area | region used as the object which a coating material is apply | coated, or the area | region where the coating-film surface of a coating material is provided through intermediate members, such as an insulating layer. Furthermore, the base material is a plate-like body attached to a frame-like base structure forming a wall surface.

  In addition, since the uniformity of the filling state of charcoal particles is enhanced, the coating film surface of the coating becomes uniform (the film thickness is uniform), and the film forming property, flexibility, surface contamination, and surface flaw adhesion are good. It can be done. In addition, the appearance of the coating can be improved.

  Moreover, the electrical conductivity of a coating material improves because the contact area of charcoal particle | grains increases. Also, the coating film strength can be enhanced.

  Furthermore, since the uniformity of the filling state of the charcoal particles is enhanced, the unevenness of the electrical resistance value on the coating film surface is reduced when the entire coating film surface is regarded as an electrode surface to be charged to a negative voltage. The collection efficiency of charged particles can be enhanced.

  In addition, since the coating film surface of the coating becomes uniform, it becomes difficult to cause detachment of the charcoal particles after application, as compared with the one in which the charcoal powder having a single particle size (average particle size) is blended in the paint.

  Moreover, since the coating film surface of a coating is smooth | blunted, the whitening at the time of touching a coating film surface with a finger is suppressed. Moreover, the adhesive strength at the time of sticking a cloth | cross with respect to a coating-film surface improves.

  Furthermore, the viscosity of the paint increased by the fact that charcoal powder having different particle sizes was dispersed in the paint, as compared to a single particle size charcoal powder blended in the paint, and the paint was preserved and placed At the same time, it becomes difficult to cause precipitation of charcoal powder with a large particle size. That is, storage stability is improved.

  Further, by using charcoal powder having a small particle size, the surface area of charcoal powder is increased, so that the adsorption efficiency of odor, chemical substance, moisture and the like is improved.

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

  Further, as described above, the charcoal powder includes 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. Uniformity of film surface, film formation, flexibility, surface contamination, surface flaw adhesion, conductivity of paint and improvement of film strength, reduction of unevenness of electric resistance value on film surface, charcoal particles The performance of the coating film can be further enhanced, such as suppression of falling off, suppression of whitening, improvement of adhesive strength of cloth, and suppression of sedimentation of charcoal powder.

  On the other hand, when the charcoal powder is configured to include the second charcoal powder having a particle size smaller than 1 time of the particle size of the first charcoal powder, particles between charcoal powder having a large particle size can be obtained. Charcoal powder with a small diameter is difficult to enter and it becomes difficult to make the filling state of charcoal powder uniform. Along with this, the improvement of the coating film performance becomes insufficient. In addition, the particle size of the second charcoal powder becomes close to the particle size of the first charcoal powder, and as a result, the density of the mixed state decreases, and the improvement of the coating film strength becomes insufficient.

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

  Also, when the first charcoal powder is a powder with a center particle diameter of 5 μm of 3000 mesh or less and the second charcoal powder is a powder with a center particle diameter of 10 μm of 1500 mesh or less, the coating described above Uniformity of film surface, film forming property, flexibility, surface contamination property, surface flaw adhesion property, conductivity of coating material and improvement of coating film strength, reduction of unevenness of electric resistance value on coating film surface, removal of charcoal particles The performance of the coating film, such as the suppression of whitening, the suppression of whitening, the improvement of the adhesive strength of the cloth, and the suppression of the precipitation of charcoal powder, can be further sufficiently enhanced. In addition, with the central particle size said here, the central particle size defined by the measurement by a known particle diameter measuring device or the sieving test method prescribed | regulated to JIS8815 is employable.

  When the first charcoal particles are blended in 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, the film forming property, the flexibility, It is possible to further enhance the performance of the coating film, such as surface contamination, surface flaw adhesion, conductivity of coating material, coating film strength, storage stability, and adhesion strength with a base material.

  On the other hand, when the first charcoal particles are compounded in an amount of less than 30 parts by weight with respect to 100 parts by weight of the second charcoal particles, uniformity of film surface, film forming property, flexibility, surface contamination, The surface flaw adhesion, the conductivity of the paint, the coating strength, the storage stability, and the adhesion strength to the base material are not sufficiently improved. When the first charcoal particles are added in an amount of more than 100 parts by weight with respect to 100 parts by weight of the second charcoal particles, the flexibility decreases and the surface contamination is not improved, and The adhesive strength of the

  When the blending ratio of charcoal powder is 30 parts by weight with respect to 100 parts by weight on the basis of the total amount, it is even more sufficient to impart thickness and strength to the resin and impart conductivity to the paint. Become.

  In addition, when the binder is made of a cationic acrylic resin, the electrical connection between the charcoal powder whose surface of the particles tends to be negatively charged and the cationic acrylic resin work, and the binder and charcoal powder are produced. Can be easily adhered, and the coating film strength can be improved. In addition, when the base material to which the paint is applied is such that the surface is likely to be negatively charged, such as concrete or gypsum board, for example, the electrical connection between the paint and the base material works to make 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.

  In addition, when the weight ratio of aluminum hydroxide is in the range of 0.1 to 10% on the basis of the total amount, the flame retardancy of the paint can be further enhanced.

  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 becomes insufficient. In addition, when the weight ratio of aluminum hydroxide exceeds 10% based on the total amount, the flame retardancy of the paint is improved, but the compounding amount becomes more than necessary, which adversely affects the improvement of the manufacturing cost and the compounding of other components. There is a risk of

  Further, in order to achieve the above object, the air purification mechanism of the present invention is an air purification mechanism in which a coating surface to which a conductive aqueous paint composition is applied is charged to a negative voltage by negative voltage generation means. The aqueous coating composition contains a binder composed of a synthetic resin, charcoal powder composed of at least two powders different in particle diameter, and water.

  Here, by containing charcoal powder having at least two different particle sizes, when the paint is applied to the base material, charcoal powder having a small particle size gets in between the charcoal particles having a large particle size. The uniformity of the packing state of charcoal particles can be enhanced, and the packing rate of charcoal powder per unit area can be improved.

  In addition, when the coating surface coated with the conductive aqueous coating composition is charged to a negative voltage by a negative voltage generation means, an electrical attraction is generated on the surface of the coating surface, and the air around the coating surface is in the air. The positively charged particles present can be collected.

In addition, when the coating amount of the aqueous coating composition on the coating film surface is in 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 coating is applied to the base material in operation, the paint can be applied one or two times.

  In addition, when the generated voltage at the coating film surface charged to a negative voltage by the negative voltage generation means is in the range of -100 to -150 V, the electric attraction of the coating film surface becomes sufficient, and the coating film The efficiency of collecting positively charged particles present in the air surrounding 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 one wall surface or ceiling surface and charged to a negative voltage. The air in the space can be sufficiently cleaned.

  On the other hand, if the generated voltage at the coating film surface charged to a negative voltage by the negative voltage generation means is less than -100 V, the collection efficiency of positively charged particles present in the air around the coating film surface is There is a risk that it will be insufficient. When the voltage generated on the coating film surface charged to a negative voltage by the negative voltage generation means exceeds -150 V, the voltage generated by the required negative voltage generation means becomes large, and the negative voltage generation means becomes larger or This leads to a rise in the cost of power required to supply a negative voltage.

  Further, in order to achieve the above object, according to the air purification method of the present invention, at least one surface of a plurality of wall surfaces or a ceiling surface constituting an indoor space, a binder made of a synthetic resin, and at least two particles Applying a conductive aqueous coating composition containing charcoal powder composed of powders different in diameter and water, and charging the coating surface on which the aqueous coating composition is applied to a negative voltage Equipped with

  Here, when the water-based paint composition contains charcoal powder, the resin can have thickness and strength. In addition, conductivity can be imparted to the aqueous coating composition. Furthermore, charcoal powder can adsorb odors, chemical substances, moisture and the like.

  In addition, charcoal powder composed of powder having at least two different particle sizes causes charcoal powder with small particle size to be inserted between charcoal particles with large particle size when paint is applied to the base material. The uniformity of the packing state of charcoal particles can be enhanced, and the packing rate of charcoal powder per unit area can be improved. In addition, the conductivity of the water-based paint composition can be improved.

  Moreover, a coating film can be formed in a wall surface or a ceiling surface by apply | coating an aqueous | water-based coating composition to the surface of at least 1 of several wall surfaces or ceiling surfaces which comprise indoor space. Moreover, not only a wall surface or a ceiling surface is protected by this coating film, but conductivity can be provided.

  In addition, the coating film surface can be made into a negatively charged electrode surface by the step of charging the coating film surface coated with the aqueous coating composition to a negative voltage. As a result, an electrical attraction is generated on the surface of the coating surface, and positively charged particles present in the air around the coating surface can be collected.

  Further, in order to achieve the above object, according to the air purification method of the present invention, an insulating layer is provided on at least one surface of a plurality of wall surfaces or ceiling surfaces 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 different particle sizes of powder and water on the insulating layer, and applying the aqueous coating composition Charging the coated film surface to a negative voltage

  Here, when the paint is applied to the base material by charcoal powder composed of at least two different particle sizes of powder, charcoal powder of small particle size enters between charcoal particles of large particle size. As a result, the uniformity of the packing state of charcoal particles can be enhanced, and the packing rate of charcoal powder per unit area can be improved. In addition, the conductivity of the water-based paint composition can be improved.

  Moreover, while providing an insulating layer on at least one surface of a plurality of wall surfaces or ceiling surfaces constituting an indoor space, the wall surface or ceiling surface is electrically conductive by applying a conductive aqueous coating composition on the insulating layer. Even when it is formed of a material having a property, it becomes easy to maintain the negatively charged surface of the coated film. That is, the current flows to the soil surface side via the wall surface or the ceiling surface, and the potential difference generated on the coating film surface can be prevented from disappearing.

  In addition, the coating film surface can be made into a negatively charged electrode surface by the step of charging the coating film surface coated with the aqueous coating composition to a negative voltage. As a result, an electrical attraction is generated on the surface of the coating surface, and positively charged particles present in the air around the coating surface can be collected.

  Moreover, when providing the coating film surface of a water-based coating composition only in any one surface of several wall surfaces or a ceiling surface, it exists in the air around a coating film surface, reducing the usage-amount of a coating material. Positively charged particles can be collected.

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

It is an explanatory view showing an outline of an air purification mechanism concerning the present invention. It is perspective explanatory drawing which shows the coating-film surface to a base material, and its periphery structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, the position of the floor surface with respect to the ceiling surface 2 is referred to as “below” or “below”, and the position of the ceiling surface 2 relative to the floor is referred to as “above” or “above”. Do. The direction of the base material 11a is referred to as "base material side" when viewed from the finishing material 7 with reference to FIG. 2, and the direction of the finishing material 7 is referred to as "room side" when viewed from the base material 11a.

(Air purification mechanism A)
In an air purification mechanism A which is an example of an air purification mechanism to which the present invention is applied, as shown in FIG. 1, the air in the indoor space 3 surrounded by the plurality of wall surfaces 1 and the ceiling surface 2 is purified. In the air purification mechanism A, a coating film surface 41 of a coating material 4 to be described later is formed on the wall surface 11, and has a negative voltage generator 5 for charging the coating film surface 41 negatively. That is, the air purification mechanism A purifies the air in the indoor space 3 by combining the paint 4 and the negative voltage generator 5. The paint 4 is an example of a water-based 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 supply 54 (see FIG. 2), and has a coating surface 41 of the wall surface 11 in wiring contact with the negative electrode 52. And the coating film surface 41 is negatively charged.

  The tip of the negative electrode 52 is in direct contact with the coating surface 41 and fixed in a state of being in contact via a mounting member or the like (not shown). The positive electrode 51 is connected to the ground 53 in the ground. 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 the negatively charged state, that is, the coating surface 41 is The electrically independent state is configured to be maintainable. 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 is, the more easily the coating surface 41 becomes electrically independent. Become. Further, the insulation resistance value includes the presence or absence of the insulating paint applied between the coating surface 41 and the wall surface 11, the presence or absence of the insulating sheet provided between the coating surface 41 and the wall surface 11, and the wall surface 11. It changes with the presence or absence of the insulation in the raw material of a base structure (frame structure used as frame | skeleton of a wall surface), and the insulation in the raw material of the plate-shaped base material attached to a base structure.

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

  Here, the surface on which the paint film surface 41 of the paint 4 is formed is not necessarily limited to the wall surface 11. For example, the paint 4 is further applied to the wall surface 1 other than the wall surface 11 and the ceiling surface 2. It may be In addition, the paint 4 may be applied only to the other wall surfaces 1 or only to the ceiling surface 2. For example, it is also possible to apply the paint 4 to the entire surfaces of the plurality of wall surfaces 1 and the ceiling surface 2 from the viewpoint of sufficient air purification according to the size of the indoor space 3.

Moreover, although the coating material 4 is one standard, if it is premised to apply only to the ceiling surface 2 in the room, the minimum required coating area is 0.4 m ² to 1 m ³ of air volume of the indoor space 3. It becomes degree. For example, if it is a general indoor space of 18 帖 (帖 = m ² × 0.3025 × 2) or less, by applying the paint 4 to one surface of the ceiling surface, it is possible to Charged particles can be collected efficiently. In the case where the paint 4 is applied only to the wall surface, the space volume is increased when the indoor area is wide, and there is a risk that the necessary minimum application area can not be secured on the entire wall surface. In accordance with the size of the indoor space, it is possible to sufficiently purify the air in the indoor space 3 by applying to a plurality of wall surfaces.

  Further, the paint 4 does not necessarily have to be applied to the entire surface of the wall surface 11, and it is sufficient if the negative voltage generator 5 is configured to negatively charge the surface to which the paint 4 is applied. Therefore, for example, there may be a mode in which the paint 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 places (so as to have a space between the application places). However, the paint 4 acts on the entire surface of the wall surface 11 from the viewpoint of increasing the efficiency of collecting positively charged particles in the air by acting on the film surface of a certain area with respect to the air in the indoor space 3. Preferably, it is applied.

  Further, the size of the indoor space 3 to which the air purification mechanism A is applied is not particularly limited, and if it has an area 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.

  In addition, the negative voltage generator 5 does not necessarily have to have a configuration in which the negative electrode 52 is brought into direct contact with the coating surface 41 to negatively charge the coating surface 41. For example, a configuration may be employed in which the coating surface 41 is negatively charged by using a negative charge generator such as an ion generator capable of irradiating the coating surface 41 without negative charge in a noncontact manner.

  Further, the device generated voltage of the negative voltage generator 5 does not have to be limited to the range of 0 to 300V. However, from the viewpoint of collecting positively charged particles in the air of the indoor space 3 sufficiently, it is possible to print a reference generation voltage of -100 to -150 V on the coating film surface 41. For that purpose, it is preferable to adopt a device in which the device generated 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.

(Painted surface 41)
The coating film surface 41 provided on the wall surface 11 and the peripheral structure thereof will be described with reference to FIG.
The base material 11a which comprises the wall surface 11 is a basic body (plate-like body) which forms the coating-film surface 41, and is formed by the raw material which has electroconductivity, such as a gypsum board and a concrete. Under the base material 11 a, a frame-like base structure that constitutes a skeleton of the wall surface 11 is formed. In addition, an insulating layer 6 is provided between the base material 11 a and the coating film surface 41 to prevent current leakage from the coating film surface 41 to the base material 11 a side. Further, on the indoor side of the coating film surface 41, a finishing material 7 for enhancing the designability is provided.

The coating film surface 41 is formed by applying a paint 4 having a composition to be described later on the 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 to the coating film surface 41 from the negative voltage generator 5 so that the coating film surface 41 is negatively charged. That is, through the conductivity of the coating film surface 41, the entire coating film surface becomes an negatively charged electrode surface. Here, the insulating layer 6 insulates between the coating surface 41 and the base material 11 a in order to maintain the coating surface 41 electrically isolated 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 bonded to the base material 11 a using a cloth (wall paper) bonding paste.

  In the three-layer structure of the insulating layer 6, the Japanese paper layer on the base material side enables adhesion using the adhesive for cross-bonding of the insulating sheet layer and the base material 11a. In addition, the adhesion to the paint 4 is enhanced with respect to the Japanese paper layer on the indoor side. By using a paper material such as a Japanese paper layer, it is possible to improve the adhesion of the paste for cross attachment and the adhesion of the paint 4 more than when a resin material such as vinyl is used.

  Here, the insulating layer 6 does not necessarily have to have a three-layer structure, and it is sufficient if it can ensure insulation between the coating surface 41 and the base material 11 a. However, by providing washi paper layers on the front and back surfaces of the insulating layer 6, a three-layer structure including the washi paper layer is adopted, as it is possible to improve the adhesion of the coating 4 and paste for cross attachment as described above. Is preferred.

  Further, the intermediate layer of the insulating layer 6 does not necessarily have to be formed of polyethylene terephthalate, and it is sufficient if it is a material having electrical insulation. For example, it is also possible to use an epoxy-based rustproof, waterproof coating-coated intermediate layer having insulation properties.

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

Since 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), the air holes of the finish 7 are It passes through and is attracted to the negatively charged coating surface 41 on the base material 11a.

  In addition, although the case where the foundation material 11a (or foundation structure material) is a material which has electrical conductivity of non-wooden structure made of steel frame or concrete was explained above, the foundation material and the foundation structure material are insulating properties such as wooden In the case of the material of the above, the 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 finish material 7 is provided thereon. In the case where the base material and the base structure material are insulating materials such as wooden, the coating surface 41 is electrically isolated from the ground 53 in the ground by the insulating function of the base material and the base structure material. Can be maintained.

  Furthermore, even if the base material is a wooden structure, the above-described case is adopted where a conductive material is adopted for the base structure, or a metal screw or the like is used to attach the base material to the base structure. 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 a voltage is applied to the film surface 41 so that the film surface 41 is electrically independent of the ground 53 in the ground. If it becomes, the coating film surface 41 will be in the state negatively charged. When the negative voltage generator 5 is turned on, the coating surface 41 attracts particles of positively charged harmful substances and unpleasant substances in the air of the indoor space 3 as an electrode surface negatively charged. Collect particles. As a result, the air in the indoor space 3 can be purified.

  Hereinafter, the composition of an example of the water-based paint 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 acid ester copolymer aqueous emulsion (Movinyl 7820 (manufactured by Japan Synthetic Chemical Industry Co., Ltd.)): 29. 07%, water: 29.07%, 1500 mesh charcoal powder (central particle diameter 10 μm): 19.38%, 3000 mesh charcoal powder (central particle diameter 5 μm): 9.69%, aluminum hydroxide: 4. 84%, acrylic polymer (thickener 615 (manufactured by Sanyo Chemical Industries, Ltd.): 2.91%, preservative (Amolden FS-14D (manufactured by Daiwa Chemical Co., Ltd.): 2.91%, urethane) Modified polyether (Sickner 660T (manufactured by Sanyo Chemical Industries, Ltd.): 1.94%, antifungal agent (PBM-DS (manufactured by MCC Co., Ltd.): 0.10%, silicone based extinguisher) Foaming agent (Aqualen HS-01 (Kyoei The chemical composition of the present composition has a viscosity of 0.83 Pa · s and a density of 1.623 g / cm ³ .

  The cationic acrylic acid ester copolymer aqueous emulsion (Movinyl 7820 (manufactured by Japan Synthetic Chemical Industry Co., Ltd.)) is a binder, which connects particles of charcoal powder as a main component of the coating film, Form a film. Moreover, this acrylic acid ester copolymer aqueous emulsion is an aqueous emulsion containing about 45% of acrylic acid ester copolymer, and the remainder being composed of water, and having a glass transition temperature (Tg) of 4 ° C.

  Water is a solvent that mixes and disperses the components. Water is also the basis of paints.

  1500 mesh charcoal powder (central particle size 10 μm) and 3000 mesh charcoal powder (central particle size 5 μm) are aggregates (inorganic pigments) that give thickness (strength) to resin (coating film), and paint Give conductivity. Furthermore, charcoal powder imparts the function of adsorbing odors, chemical substances, moisture and the like to paints.

  In this paint, two types of charcoal powder having different particle sizes are mixed, and the ratio of the value of the central particle size is in the relation of large particle diameter: small particle diameter = 2: 1. Further, the blending ratio of the two types of charcoal powder is 50 parts by weight of charcoal powder with a small particle size with respect to 100 parts by weight of charcoal powder with a large particle size. Furthermore, in this paint, the blending ratio of the total of the two types of charcoal powder to the basis of the total weight 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 weight of the paint.

  In addition, charcoal powder of 1500 mesh and 3000 mesh is white charcoal baked at around 1000 ° C., using a tree of the Hypericillium genus Methonia (Mitue, without a Japanese name) as a raw material. Charcoal powder is, for example, white carbon produced by baking ubamegashi 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. Among the white coals, there is Bincho charcoal as a representative one.

  Aluminum hydroxide is a flame retardant for improving the flame retardancy of the paint. Aluminum hydroxide is an agent which causes dissociation reaction of crystal water at a temperature of 200 ° C. or more and produces an endothermic effect at the time of dissociation reaction.

  Acrylic polymers (Siccner 615 (manufactured by Sanyo Chemical Industries, Ltd.) and urethane-modified polyether (Sickner 660T (manufactured by Sanyo Chemical Co., Ltd.)) are thickeners for adjusting the viscosity of the paint. Each thickening agent contains an acrylic polymer or a urethane-modified polyether as a main component.

  Preservative (Amolden FS-14D (manufactured by Daiwa Chemical Industry Co., Ltd.)) is an antiseptic for emulsions, water-based paints, etc. which imparts antiseptic properties against bacteria and molds. M.I.C. Co., Ltd. is an antifungal agent which imparts antiseptic properties to molds A silicone based antifoam agent (Aqualen HS-01 (Kyoeisha Chemical Co., Ltd.)) suppresses foaming in the paint. It is an antifoamer for water-based paints.

  Here, in the present coating material, the respective blending raw materials and the blending ratio are not limited to those described above, and the respective components and blending amounts can be appropriately changed without departing from the function required in the present invention. An example will be described in detail below.

  In the present paint, as a binder, any synthetic resin having a film-forming ability besides a cationic acrylic acid ester copolymer aqueous emulsion (Movin 7820 (manufactured by Japan Synthetic Chemical Industry Co., Ltd.)) may be employed. be able to. For example, as a kind of synthetic resin, in addition to acrylic resin, acrylic silicone / modified silicone resin, amino alkyd resin, epoxy resin, chlorinated rubber resin, silicone resin, vinyl resin, fluorocarbon resin, phenol resin, phthalic acid resin, unsaturation Polyester resin, polyurethane resin, etc. can be adopted.

  Further, as the acrylic resin paint, for example, types such as an emulsion type acrylic resin, an acrylic lacquer, a baked acrylic, a water soluble acrylic, an acrylated alkyd and the like can be adopted. In particular, the emulsion-type acrylic resin is an emulsion polymer obtained by emulsion-polymerizing a monomer such as an acrylic ester in water, which is widely used for building interior materials.

  Here, the binder of the present paint does not necessarily have to be a cationic acrylic ester copolymer aqueous emulsion. However, when the binder is cationic, the adhesion between the binder and the charcoal powder in which the surface of the particles is negatively charged can be improved in the coating, and the coating film strength can be improved. Also, when the base material to which the paint is applied is such that the surface is likely to be negatively charged, such as concrete or gypsum board, the electrical connection between the paint and the base material works to adhere the paint. The strength can be improved, and a strong coating film can be formed. Since there is an advantage based on such electrical properties, it is preferable to use a cationic acrylic resin as the binder.

  Moreover, the binder of the present coating does not necessarily have to have a glass transition temperature (Tg) of 4 ° C. However, by using a binder having a low glass transition temperature, the glass transition temperature of the binder is likely to fall below the environmental temperature at which the coating is applied, thereby suppressing the generation of shrinkage stress between the coating and the base material. Adhesion to the base material is less likely to decrease. Therefore, it is preferable that the glass transition temperature of a binder is a low value about 10 degrees C or less, for example. In the case of an indoor environment, the lowest temperature in the room is usually at most 5 ° C., so if the glass transition temperature of the binder is 4 ° C., sufficient adhesion of the coating can be ensured. it can.

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

  Moreover, the raw material of charcoal powder does not necessarily need to be limited to a tree of the Hypericaceae family Aeglonum (Mitue, without a Japanese name). For example, Uva megashi, Arakashi, Nara hoo, etc. which are known raw materials to be white coal can also be adopted. In addition, if it is black charcoal, it is possible to use nara, kunugi, konara, Mizunara, pine, etc. as raw materials.

  Further, the aggregate (inorganic pigment) of the present coating does not necessarily have to be limited to charcoal powder, and any material that can ensure sufficient filling rate and uniformity in resin can be adopted as the aggregate. For example, powders of minerals such as rock and clay, powders obtained by crushing shells, powders of activated carbon, and the like can be adopted. However, in addition to providing thickness and strength to the paint, it has the adsorptive properties of harmful substances and unpleasant substances as an adsorptive substance, the availability of raw materials is easy, and the uniformity in the paint of powders different in particle diameter From the point of being easy to raise, it is preferable that charcoal powder is adopted as an aggregate.

  In addition, the charcoal powder of the present coating does not necessarily have to be limited to two types having different particle sizes, and may be, for example, an embodiment in which three or more types of charcoal powders having different particle sizes (central particle sizes) are mixed. . However, it is preferable to use two types of charcoal powder having different particle sizes from the viewpoint that the control of the uniformity of the coating film by the adjustment of the blending amount becomes complicated and the manufacturing cost becomes high.

  In addition, it is not necessary that the charcoal powder of the present coating compound two kinds of different particle sizes, and the ratio of the value of the central particle size is not limited to large particle size: small particle size = 2: 1. However, from the viewpoint of improving the uniformity of the coating film, the ratio of the value of the central particle diameter in the two types of charcoal powder is preferably: particle diameter large: particle diameter small = 1 to 2: 1, and more preferably Particle diameter: 1.5 to 2: 1, and from the viewpoint of further improving the uniformity of the coating, particle diameter: 2: 1 preferable.

  Further, the two types of charcoal powder different in particle diameter of the present paint are not necessarily the 1500 mesh charcoal powder (central particle diameter 10 μm) and the 3000 mesh charcoal powder (central particle diameter 5 μm). For example, an aspect may be considered in which a large particle size charcoal powder is 3000 mesh and a small particle size charcoal powder is 6000 mesh. However, the point at which the filling state of charcoal powder in the paint is easily made uniform, the point at which the filling rate of charcoal powder per unit area is easy to improve, and the amount of binder (resin) necessary for forming a coating film Two types of charcoal powder with different particle sizes, 1500 mesh charcoal powder (central particle size 10 μm) and 3000 mesh charcoal powder (central particle size 5 μm) from the point of achieving a blending amount that can ensure flame retardancy It is preferable that

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

  In addition, in the present paint, the total blending ratio of the two types of charcoal powder to the total weight of the paint is limited to 30 parts by weight of the two types of charcoal powder relative to 100 parts by weight of the total weight of the paint is not. It is sufficient that the coating film can be formed and the coating film surface on which the voltage is printed has a conductivity capable of maintaining the negatively charged state. However, from the viewpoint of securing the uniformity of the coating film and good conductivity, the blending ratio of the total of the two types of charcoal powder to the basis of the total weight of the paint is two types of charcoal with respect to 100 parts by weight of the total amount of paint. Preferably, the powder is 30 parts by weight.

  In addition, the present paint does not necessarily have to contain aluminum hydroxide. However, aluminum hydroxide is preferably blended in the present paint, from the viewpoint of being able to improve the flame retardancy of the paint film surface of the paint.

  Moreover, the blending ratio of aluminum hydroxide in the present paint does not necessarily have to be limited to 4.84% by weight based on the total weight of the paint. However, from the viewpoint of improving the flame retardancy of the paint film surface of the paint, it is preferable that the weight ratio of the aluminum hydroxide is in the range of 0.5 to 10% on the basis of the total weight of the paint. From the viewpoint of imparting flame retardancy, it is more preferable that the blending ratio of aluminum hydroxide is in the range of 4.0 to 6.0% by weight based on the total weight of the paint.

  In addition, in the water-based paint composition to which the present invention is applied, other components can be blended as needed in the range not departing from the effects of the present invention, as needed, in addition to the composition described above. For example, it is also possible to separately add an additive component that improves the functionality of the paint, such as a thickener, an antiseptic, an antifungal agent, an antifoaming agent, and a flame retardant.

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

  Further, by applying a voltage to the paint 4 through the negative voltage generator 5, the coating film surface is negatively charged, and positively charged particles in the air around the coating film 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 excellent in quality, and exhibit a sufficient air purification function to indoor space. Is possible.

  Hereinafter, examples of the present invention will be described.

The sample of the example of the coating material to which this invention is applied, and the comparative example 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 Tables 2-6, and each sample of Examples 1-6 and comparative examples 1-5 was produced. The numerical values shown in Tables 2 to 6 below indicate the weight (kg) of the raw material and the weight ratio (%) based on the total amount of the raw material. Further, Examples 1 to 3 and Comparative Examples 1 to 3 are compositions assuming coating materials when manually applied to a base material using a roll or the like, and in addition to the moisture contained in the acrylic resin to be a binder. It is the composition which added water separately and adjusted the viscosity. Moreover, Example 4-6 and Comparative Examples 4 and 5 are the compositions supposing the coating material at the time of applying with machines for application | coating, such as a roll coater, and add water other than the water | moisture content contained in acrylic resin used as a binder. It is the composition which adjusted 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. Moreover, the result of having performed various tests of the test numbers 1-11 described below with respect to Examples 4-6 and Comparative Examples 4 and 5 is shown in Table 8.

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

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

(3) Density (solid charcoal filling rate) (Test No. 2)
The weight per unit volume of each of Examples 1 to 6 and Comparative Examples 1 to 5 was measured to confirm the density (g / cm ³ ). The sample was put into an acrylic container with a container size of 100 mm × 100 mm × 100 mm, the surface was scraped with a scraper, and then the weight was measured, and the density was calculated by the volume of the mass. The measurement was performed three times per sample under the temperature condition of 25 ° C. ± 2 and the average value of the three measurements was taken as the measurement result. Moreover, about a measurement result, what used as a value with a density of 1.5 g / cm < ³ > or more shall be evaluated as a coating material with a favorable charcoal solid filling rate.

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

(4) Storage stability (Test No. 3)
About Example 1-6 and Comparative Examples 1-5, after stirring a sample, the container was made to stand and the presence or absence of the precipitation of the charcoal powder to the container bottom after required time progress was confirmed. A plastic spatula (width 2 cm, thickness 2 mm) was used to check for the presence of charcoal on the bottom of the container. The evaluation was performed under the temperature condition of 25 ° C. ± 2. In addition, samples after 24 hours and 72 hours after 1 hour after stationary were confirmed. The test results are as follows: 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), The evaluation was made in three stages, where separated precipitation of charcoal powder was observed at the bottom of the vessel (indicated by x in Tables 7 and 8).

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

(5) Film forming property (dispersion degree) (Test No. 4)
About Examples 1-6 and Comparative Examples 1-5, the dispersion degree (micrometer) of the charcoal powder in the coating material in each sample was measured, and it was set as evaluation of film-forming property. The degree of dispersion was measured in accordance with 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 per sample under the temperature condition of 25 ° C. ± 2 and the average value of the three measurements was taken as the measurement result. With regard to the measurement results, those having an average value of 50 μm or less were evaluated as paints having a good degree of dispersion of the charcoal powder, ie, a good film forming property.

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

(6) Flexibility (Test No. 5)
About Examples 1-6 and Comparative Examples 1-5, each sample was apply | coated to a base material, after drying, load was applied and the presence or absence of generation | occurrence | production of a crack was confirmed, and it was set as evaluation of the bending resistance (coating-film strength). Apply samples of prescribed amounts (150 g / m ³ , 300 g / m ³ and 450 g / m ³ ) of three patterns on a strip-like substrate (width 5 cm, length 20 cm, made of polypropylene) and dry for 7 days Place a 5 mm φ pillar at the center of the substrate and bend the 180 ° C. substrate for 2 seconds. After bending, it was confirmed whether or not a crack was generated at the center of the substrate. The test results were evaluated with no crack (denoted by ○ in Tables 7 and 8) and cracked (denoted by × in Tables 7 and 8).

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

(7) Conductivity (Test No. 6)
About Example 1-6 and Comparative Examples 1-5, after apply | coating each sample to a base material and drying, using a digital multimeter (manufactured by Sanwa Denki Keiki Co., Ltd., RD700), a coating resistance value (kΩ) ) Was measured to determine the conductivity. Base material (100 mm x 100 mm, made of polypropylene), the prescribed amount of eight patterns (100 g / m ³ , 150 g / m ³ , 200 g / m ³ , 250 g / m ³ , 300 g / m ³ , 350 g / m ³ , 400 g / m Each sample of m ³ and 450 g / m ³ ) was applied, and after drying for 7 days, the resistance value of the surface of the substrate was measured. The measurement was performed 5 times per sample under the temperature condition of 25 ° C. ± 2 and the average value of the 5 times measurement was taken as the measurement result. Moreover, about the measurement result, that whose average value of a measured value is 3 k (ohm) or less was evaluated as the coating material (application amount) which has suitable conductivity. In addition, a coating-film resistance value is a numerical value used as the parameter | index of the flowability of electricity in a coating-film surface, and the smaller this value, the more excellent the conductivity of the coating-film surface.

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) Adsorptive properties (Test No. 7)
About Examples 1-6 and Comparative Examples 1-5, after apply | coating each sample to a base material and drying, it is made to contact with adsorption object gas (ammonia, formaldehyde, toluene) for 10 minutes within a test container, and initial stage adsorption with respect to object gas The percentage (%) was measured to evaluate the adsorptivity. Each sample of a prescribed amount (300 g / m ³ ) was applied to a base material (100 mm × 100 mm, made of polypropylene), and dried for 7 days as 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 detection tube manufactured by Gastec Co., Ltd. The adsorptivity was represented by the reduction rate (%) before and after placing the test piece in the container. The measurement was performed three times per sample under the temperature condition of 25 ° C. ± 2 and the average value of the three measurements was taken as the measurement result. With regard to the measurement results, in the average value (reduction rate) of the measured values, ammonia and formaldehyde are 80% or more, and toluene is 40% or more. It evaluated that there was.

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

(9) Water absorption and release amount (Test No. 8)
For each of Examples 1 to 6 and Comparative Examples 1 to 5, after each sample is applied to a substrate and dried, it is held in a dry environment or a wet environment for 24 hours, and the moisture absorption is obtained from the change amount of the substrate weight before and after the holding. The amount released was evaluated. Each sample of a prescribed amount (300 g / m ³ ) was applied to a base material (100 mm × 100 mm, made of polypropylene), and dried for 7 days as a test piece. In addition, the test piece was kept for 24 hours in each of a dry environment (room temperature 25 ° C., humidity 50%) or a wet environment (room temperature 25 ° C., humidity 90%). The test pieces were weighed (g) before and after holding. 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 the dry environment was taken as the amount of released water (g / m ² ). Moreover, the weight change of the test piece before and behind holding | maintenance was calculated, and the value of the weight change of the test piece hold | maintained in a wet environment was made into water absorption amount (g / m < ² >). Further, the results of measurement of water release and water absorption were evaluated to be paint having a weight change value of 15 g / m ² or more as a paint having a good water absorption and release amount (humidity control property).

The water release amount and the water absorption amount were 15 g / m ² or more in all Examples 1 to 6, and had a good water absorption and release amount.

(10) Adhesion strength (Test No. 9)
For each of Examples 1 to 6 and Comparative Examples 1 to 5, after each sample is applied to a substrate and dried, or after being dried, it is further held in a wet environment for 24 hours to conduct a tensile test, and the adhesion strength of the coating is obtained. Was evaluated. If the adhesion strength of the coating film is high, it can be said that the adhesion of the coating to the base material and the followability to the base material are good. Apply a specified amount (300 g / m ³ ) of each sample to a substrate (100 mm × 100 mm, gypsum board), dry for 7 days, and let the dried sample be “dry (test piece)” for 7 days After drying, those kept for 24 hours under each environment of a wet environment (room temperature 25 ° C., humidity 90%) were taken as “high humidity environment (test piece)”. A metal attachment is adhered to each test piece via an epoxy resin as an adhesive agent to the test piece, and a metal is used with a bond strength tester (LPT-400, manufactured by Oxjack Co., Ltd.). The tensile test of the attachment was performed to measure the load (kg / cm ² ) when the coating film broke or when the test piece broke. The measurement was performed under the temperature condition of 25 ° C. ± 2. Moreover, about the measurement result, the thing with a measured value of 15 kg / cm < ² > or more was evaluated as the coating material in which the adhesion strength (base | substrate adhesiveness and base | substrate following property) to a base material is favorable.

Example 1 showed an adhesion strength of 15 kg / cm ² or more both in dry and in a high humidity environment. Moreover, Examples 2-6 showed 15 kg / cm < ² > or more of adhesion strength (base | substrate adhesiveness, base | substrate follow-up property) at the time of drying.

(11) Surface contamination (Test No. 10)
For each of Examples 1 to 6 and Comparative Examples 1 to 5, after each sample was applied to a substrate and dried, or after being dried, it was kept in a wet environment for 24 hours to perform a fabric contamination test, evaluated. Apply a specified amount (300 g / m ³ ) of each sample to a substrate (200 mm × 200 mm, gypsum board), dry for 7 days, and let the dried sample be “dried (test piece)” for 7 days After drying, those kept for 24 hours under each environment of a wet environment (room temperature 25 ° C., humidity 90%) were taken as “high humidity environment (test piece)”. For each test piece, a white cloth was placed on the surface of the test piece, a weight of 100 g was placed thereon, the cloth was pulled, and the presence or absence of soiling of the cloth was checked. The test results were evaluated on the basis of no stain (denoted by 表 in Tables 7 and 8) and dirt (denoted by x in Tables 7 and 8).

  In Examples 1, 2, 4 and 5, no soiling was observed on the fabric both in the dry and in the high humidity environment. Moreover, in Examples 3 and 6, no adhesion of dirt was observed on the dough at the time of drying.

(12) Surface flaw adhesion (Test No. 11)
About Examples 1-6 and Comparative Examples 1-5, each sample was apply | coated to a base material, the wound adhesion test to the coating film by cloth was done after drying, and surface wound adhesion was evaluated. A specified amount (300 g / m ³ ) of each sample was applied to a substrate (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 cloth on the surface of the test piece, place a 100 g weight on it, pull the cloth, and generate friction between the cloth and the coated surface to scratch the coating surface. We confirmed the presence or absence of outbreak. The test results were evaluated with no scratch adhesion (indicated by 記載 in Tables 7 and 8) and with scratch adhesion (indicated by × in Tables 7 and 8).

  In Examples 1 to 6, no adhesion of scratches was confirmed.

(13) Flame retardancy (Test No. 12)
About Example 1-3 and Comparative Examples 1-3, each sample was apply | coated to a 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 substrate (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 distance of 20 cm from the test piece, add fire to the burner, turn off the fire after 2 minutes, and generate damage on the coating surface of the test piece, smoke and gas We confirmed the occurrence of The test results show that there is no generation of damage on the surface of the coating film, no generation of smoke or gas (indicated by 7 in Tables 7 and 8), generation of damage on the surface of the coating film, or generation of smoke or gas (Table In Table 7 and Table 8).

  In any of Examples 1 to 3, the occurrence of damage on the coating film surface and the 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, blending amounts of aluminum hydroxide were varied (0%, 0.5%, 1%, 2.5%, 5 %, 7.5%, 10%, 12.5%, and the like) were prepared to give Examples 7-14. For this example, the test is the same as the above-mentioned flame retardancy (Test No. 12), and after 30 seconds, 1 minute and 2 minutes after the fire is added to the burner, the coating film of each test piece We confirmed the occurrence of damage on the surface and the generation of smoke and gas. The test results show that the occurrence of damage on the surface of the coating and the occurrence of smoke and gas (denoted by 9 in Table 9), the occurrence of damage on the surface of the coating and the occurrence of smoke and gas were slightly confirmed ( In Table 9, it evaluated by generation | occurrence | production of the damage in the coating-film surface, and generation | occurrence | production of smoke and gas (it described by x in Table 9). The results are shown in Table 9 below.

  In any of Examples 11 to 14, after 2 minutes, neither generation of damage on the surface of the coating nor generation of smoke or gas was confirmed.

Reference Signs List 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 source 6 insulating layer 7 finish material

Claims (16)

A binder made of a synthetic resin,
Charcoal powder composed of at least two different particle size powders,
Water-based paint composition containing water. The aqueous charcoal according to claim 1, wherein the charcoal powder comprises a first charcoal powder and a second charcoal powder having a particle size of 1 to 2 times the particle size of the first charcoal powder. Paint composition. The first charcoal powder is a powder having a center particle size of 5 μm or less of 3000 mesh,
The water-based paint composition according to claim 2, wherein the second charcoal powder is a powder having a median particle diameter of 10 μm of 1500 mesh or less. The water-based paint composition according to claim 2 or 3, wherein the first charcoal particles are blended in 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, 2, 3 or 4, 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 water-based paint composition according to any one of claims 1, 2, 3, 4 and 5, wherein the binder is composed of a cationic acrylic resin. The water-based paint composition according to any one of claims 1, 2, 3, 4, 5 and 6, containing a flame retardant composed of aluminum hydroxide. The water-based paint composition according to claim 7, wherein the weight ratio of the aluminum hydroxide is in the range of 0.1 to 10% based on the total amount. An air purification mechanism for charging a coating surface, to which a conductive aqueous coating composition is applied, to a negative voltage by a negative voltage generating means,
The water-based paint composition comprises a binder made of a synthetic resin, charcoal powder made of at least two powders different in particle size, and water. The air purification mechanism according to claim 9, wherein the amount of the aqueous coating composition applied to the coating surface is in the range of 150 to 300 g / m ² · wet. The air purification mechanism according to claim 9 or 10, wherein a generated voltage at a coating film surface charged to a negative voltage by the negative voltage generation means is in a range of -100 to -150V. The charcoal powder comprises a first charcoal powder and a second charcoal powder having a particle size of 1 to 2 times the particle size of the first charcoal powder. Or the air purification mechanism of Claim 11. Electrically conductive material containing water and at least one surface of a plurality of wall surfaces or ceiling surfaces constituting an indoor space, a binder made of a synthetic resin, charcoal powder composed of at least two different particle sizes of powder, and Applying an aqueous paint composition of
Charging the coated surface to which the aqueous coating composition has been applied to a negative voltage. An insulating layer is provided on at least one surface of a plurality of wall surfaces or ceiling surfaces constituting an indoor space, a binder made of a synthetic resin, charcoal powder made of at least two powders different in particle diameter, water, Applying a conductive aqueous paint composition containing the above on the insulating layer;
Charging the coated surface to which the aqueous coating composition has been applied to a negative voltage. The charcoal powder comprises a first charcoal powder, and a second charcoal powder having a particle size of 1 to 2 times the particle size of the first charcoal powder. The air purification method described in. The air purification method according to claim 13, wherein the coated surface of the water-based paint composition is provided only on any one surface of the plurality of wall surfaces or ceiling surfaces.