JP2006233072A - Photocatalytic coating, and indoor interior article and wallpaper each coated with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photocatalytic coating that is imparted with prescribed deodorizing functions and antibacterial functions, does not cause deterioration of the surface of a base material to be coated therewith or a resin binder, exhibits durability and requires a coating operation only once, and to provide an indoor interior article and a wallpaper imparted with deodorizing functions and antibacterial functions by coating them with the coating. <P>SOLUTION: The photocatalytic coating comprises a water-repellent resin binder and, incorporated therewith, a metal oxide exhibiting photocatalytic functions, where a porous metal oxide is incorporated in an amount larger than the prescribed amount. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a photocatalyst paint containing a metal oxide having a photocatalytic function, an indoor interior product and a wallpaper coated with the paint.

  Recently, a photocatalyst coating containing a metal oxide having a photocatalytic function excellent in stain resistance and antibacterial properties has attracted attention.

  In recent years, awareness of health and hygiene has improved, and there is a strong demand for deodorizing, antibacterial, antifungal and antifouling, especially in indoor living spaces.

  Therefore, a method for effectively using a coating material or a surface treatment material (hereinafter collectively referred to as a paint) having an excellent photocatalytic function that exhibits a deodorizing effect and an antibacterial effect is being sought. Generally, when a metal oxide having a photocatalytic function is blended as a paint, a hydrophilic resin binder (hydrophilic polymer) is usually used in order to sufficiently exhibit a photocatalytic function against environmental dirt.

  Further, the photocatalytic function excites a violent oxidation-reduction reaction to decompose the organic matter, so that when applied as a paint, the organic matter is decomposed on the front and back surfaces of the coating film. Therefore, a protective layer is required to prevent a decomposition reaction on the surface of the substrate to be painted.

  Therefore, the base coat surface is once coated with an undercoat and then a protective layer is formed, and then the two coats are applied exclusively, and before the top coat, the undercoat step and the undercoat step are dried. Two steps were required.

  In addition, a coating composition in which a metal oxide having a photocatalytic function and an extender pigment are blended at a predetermined ratio in order to obtain a coating film having good stain resistance, durability, and appearance has been filed (for example, Patent Document 1).

Furthermore, a coating composition containing a photocatalyst that coats the surface of titanium oxide having a photocatalytic function with calcium phosphate to make the organic coating component difficult to decompose and stabilize the coating film has already been filed (for example, Patent Document 2). reference).
JP 2004-315727 A (pages 1-7) JP 2000-1631 A (pages 1-9)

  When applying a paint containing a photocatalyst, especially when adding a deodorizing function or an antibacterial function to an interior material of a room, it is desirable to perform a one-time coating operation that does not require a second coat, but a second coat. Moreover, it is desirable that the base material surface to be applied does not deteriorate due to the photocatalytic action.

  Furthermore, it is desirable that the resin itself serving as the binder has durability without being deteriorated by the photocatalytic action, and effectively exhibits a deodorizing function and an antibacterial function by the metal oxide having a photocatalytic function to be blended.

  An object of the present invention is to provide a predetermined deodorizing function and antibacterial function in order to eliminate the above-mentioned problems, without deteriorating the surface of the base material to be applied and the resin binder, having durability, and applying the coating work once. A photocatalyst coating material that can be used as a photocatalyst, and an interior decoration product and a wallpaper on which the coating material is applied.

  In order to achieve the above object, the invention according to claim 1 is characterized in that it is a photocatalyst paint in which a metal oxide having a photocatalytic function is blended with a water-repellent resin binder.

  According to the invention according to claim 1 having the above-described configuration, since the water-repellent resin binder is employed, the photocatalytic reaction on the surface and the back surface of the coating film is suppressed, and the surface of the base material is not subjected to undercoating. The base material is not deteriorated by the photocatalytic action.

  In the invention according to claim 2, the blending ratio of the metal oxide is 50% or more of the blended part by weight of the water-repellent resin binder, and the blended amount is 80% to 250% of the non-volatile part by weight of the water-repellent resin binder. It is characterized by that.

  According to the invention according to claim 2 having the above configuration, since the blending ratio of the metal oxide is increased, the metal oxide is not completely buried in the water-repellent resin binder, and a predetermined deodorizing function is achieved. The anti-contamination function can be demonstrated.

  The invention according to claim 3 is characterized in that the metal oxide is porous titanium oxide.

  According to the invention of claim 3 having the above-described configuration, since the titanium oxide is porous, the deodorizing function of deodorizing the outside air by the outside air also entering the titanium oxide embedded in the water-repellent resin binder. And can exhibit antibacterial function.

  The invention according to claim 4 is characterized in that it is an interior interior product in which the photocatalyst paint according to any one of claims 1 to 3 is applied to a thickness of 5 μm or more.

  According to the invention according to claim 4 having the above-described configuration, since the photocatalyst paint having a thickness of 5 μm or more is applied to indoor interior products such as curtains, carpets, sofas, etc., the coating capable of sufficiently exerting the deodorizing function and the antibacterial function. A film can be formed.

  The invention according to claim 5 is a wallpaper in which the photocatalyst paint according to any one of claims 1 to 3 is applied to a thickness of 5 μm or more.

  According to the invention according to claim 5 having the above-described configuration, since the wallpaper is coated with a photocatalyst paint having a thickness of 5 μm or more, the wallpaper having a coating film that can sufficiently exhibit the deodorizing function and the antibacterial function can be obtained. it can. Furthermore, since the water-repellent resin binder is used, the effect that a water-repellent treatment is applied to the wallpaper also occurs.

  As described above, according to the present invention, it is possible to provide a photocatalyst coating material having a predetermined deodorizing function and antifouling function without deteriorating the surface of the base material to be applied and the resin binder. Moreover, it can be set as the photocatalyst coating material which exhibits a predetermined deodorizing function and an antibacterial function by once coating which does not require undercoating. Furthermore, it becomes easy to give a deodorizing function and an antibacterial function to interior interior goods and wallpaper.

  Hereinafter, embodiments of the photocatalyst coating material according to the present invention will be described in detail.

  The photocatalyst coating material according to the present invention is mainly used to add a predetermined deodorizing function and antibacterial function by overcoating indoor interior products and wallpaper. Therefore, it can be easily applied to anyone, and it is possible to form a coating film having a predetermined thickness by a coating operation once without applying an undercoat.

  As the metal oxide having a photocatalytic function, titanium oxide, zinc oxide, tin oxide, and the like are present. In particular, titanium oxide that has a stable photocatalytic function and is easily available is preferably used. The titanium oxide is in the form of fine particles, and a predetermined amount of the titanium oxide is mixed in an appropriate resin binder, an organic solvent, water, and the like, and stirred to produce a predetermined photocatalyst paint.

  In general, as a resin binder that disperses photocatalytic metal oxides such as titanium oxide, in order to promote the reaction of the photocatalyst, and to clean the coating surface by utilizing superhydrophilicity, which is one of the photocatalytic properties. In addition, a hydrophilic resin binder is employed.

  However, when a photocatalytic metal oxide is blended with a hydrophilic resin binder, binder decomposition due to photocatalytic action (self-collapse of the binder) and erosion of the base material due to photocatalytic action (back reaction) are likely to occur, and durability is shortened. There's a problem.

  Therefore, in the present invention, a water-repellent silicon resin or a water-repellent fluororesin is employed as a binder, and titanium oxide is blended with these water-repellent resin binders together with a predetermined solvent.

  The photocatalyst coating material obtained by mixing and mixing the water repellent resin binder, titanium oxide, and a suitable solvent such as water or alcohol with stirring in a predetermined amount is a super photocatalyst function that is required as a conventional photocatalytic function. Hydrophilicity is not expressed. Therefore, the photocatalytic reaction on the surface of the coating film coated with the paint will be suppressed, and the self-destruction and back reaction of the binder will be suppressed to increase the durability and form a long-life coating film. Become. However, it has a photocatalytic function for the gas in contact with the powdery titanium oxide surface and the gas adsorbed inside the coating film, and can exhibit an appropriate deodorizing effect and antibacterial effect.

  Moreover, since the binder is prevented from self-destructing, the binder does not deteriorate even if the blending amount of the photocatalytic metal oxide to be blended is increased. Therefore, it is possible to increase the concentration of the metal oxide to the extent that it can be applied as a paint.

  As mentioned above, the photocatalyst paint in which a metal oxide such as titanium oxide is blended in a water-repellent resin binder does not cause the back reaction described above, so an undercoat is not required to protect the substrate surface when applied to the substrate. Thus, it is possible to obtain a simple construction type paint that is simply applied once with the photocatalyst paint. For this purpose, the photocatalyst paint according to the present invention is easily applied to indoor interior products, for example, textile products such as curtains, carpets, sofas, wallpaper, floor boards, etc., thereby easily imparting a deodorizing function and an antibacterial function. be able to.

  In particular, the photocatalyst coating composition according to the present invention, which does not require an undercoat for textile products, can be suitably used, and a desired photocatalytic function can be obtained by simply applying it once to a portion where a deodorizing effect or an antibacterial effect is desired. Can be added, which is preferable.

  As a method of applying to the above interior interior goods, etc., it can be carried out by brushing, troweling, spraying or the like, and it may be dried after being applied. The drying may be natural drying or hot air drying, and can be appropriately selected and carried out.

  Moreover, in order to fully exhibit the deodorizing effect and the antibacterial effect, it has become clear that the applied coating thickness needs to be a predetermined thickness. In the confirmation test by the present inventor, it was confirmed that the film thickness should be 5 μm or more. Therefore, if the thickness of 5 μm or more can be applied once by brush coating, trowel coating, spraying, or the like, the coating operation can be completed only by coating once. Further, it is possible to form a coating film having a predetermined thickness that is thicker by overcoating a plurality of times.

  In order to sufficiently exhibit the deodorizing function and antibacterial function described above, the coating film itself needs to have a sufficient gas adsorption capacity. To that end, the adsorption surface area of the coating film may be increased. Further, in order to increase the adsorption surface area of the coating film, a metal oxide such as titanium oxide blended in the coating material having a large specific surface area may be employed. For example, porous titanium oxide manufactured by Ishihara Sangyo Co., Ltd. ST-01 can be used.

  Furthermore, by increasing the amount of the porous metal oxide to be blended, even if the metal oxide is blended in the water repellent resin binder, not only the applied surface but also the inside of the coating in the thickness direction. Can also carry an adsorption function. For that purpose, the deodorizing effect can be sufficiently exhibited by setting the coating thickness to a predetermined thickness or more.

For example, in the photocatalyst coating using the above-described titanium oxide ST-01 (manufactured by Ishihara Sangyo Co., Ltd .: specific surface area 300 m ² / g), a coating film having an adsorption surface area of 200 m ² or more per 1 m ² of the coated surface is formed. It became possible to achieve the indoor deodorizing effect.

  Next, a specific example of a photocatalyst paint will be described.

Example A: Titanium oxide ST-01 (manufactured by Ishihara Sangyo Co., Ltd .: adsorption surface area 300 m ² / g) and silicon-based water repellent oligomer FZ-4633 (manufactured by Toray Dow Corning Silicone Co., Ltd.) 40 Part by weight and 30 parts by weight of a solvent such as water were blended.

  Comparative product 1: Snowtex (manufactured by Nissan Chemical Industries, Ltd.), which is a hydrophilic polymer, was used instead of the water repellent oligomer. Other conditions are the same as in Example A.

Comparative product 2: Titanium oxide ST-21 (manufactured by Ishihara Sangyo Co., Ltd .: adsorption surface area 50 m ² / g) having a small adsorption surface area was used as a photocatalyst. Other conditions are the same as in Example A.

  Using Example A, Comparative Product 1 and Comparative Product 2 as above, using an baked acrylic coated aluminum plate as a base material, a photocatalytic coating was applied to the surface, and its photocatalytic activity (deodorizing effect) and back reaction (photocatalytic activity) Table 1 shows the results of examining the presence or absence of the erosion of the base material. The coating thickness was 5 μm, and the deodorization experiment was performed by measuring the concentration change of ammonia 3 hours after irradiation with a 20 W fluorescent lamp from a distance of 50 cm. Further, the reverse reaction was measured by a decrease in adhesiveness in a cross-cut tape peeling test after a 3000 hour accelerated test (accelerated weather resistance test (sunshine weatherometer)).

表１から明らかなように、本発明に係わる実施例Ａのみが、高い光触媒活性（消臭機能）と裏反応の防止を実現することができた。つまり、金属酸化物である酸化チタンの配合割合を３０重量部とし、撥水性樹脂バインダの配合割合を４０重量部とし、水等の溶剤の配合割合を３０とする光触媒塗料の全１００重量部に対して、前記金属酸化物の配合割合を撥水性樹脂バインダの配合重量部の５０％以上とした光触媒塗料が有効であることが判った。

As is clear from Table 1, only Example A according to the present invention was able to realize high photocatalytic activity (deodorization function) and prevention of back reaction. That is, the blending ratio of titanium oxide, which is a metal oxide, is 30 parts by weight, the blending ratio of the water-repellent resin binder is 40 parts by weight, and the blending ratio of the solvent such as water is 30 parts by weight. On the other hand, it was found that a photocatalyst coating material in which the blending ratio of the metal oxide was 50% or more of the blending weight part of the water-repellent resin binder was effective.

  The metal oxide should be blended in a predetermined high proportion with respect to 100 parts by weight of the non-volatile content of the water-repellent resin, and the silicon-based water repellent oligomer FZ-4633 (Toray) having a non-volatile content of about 60%. In the case of Dow Corning Silicone Co., Ltd., it was confirmed that a blending amount of 80% to 250% was appropriate with respect to 100 parts by weight of the nonvolatile content. If the compounding amount of the metal oxide is less than 80%, the photocatalytic function cannot be sufficiently exerted, and if the compounding amount is increased to 250% or more, the amount of the resin binder is insufficient and it becomes difficult to form a coating film.

  The 30 parts by weight of titanium oxide with respect to 40 parts by weight of the water-repellent resin binder shown in the experimental data described above is 40 × 60% = 24 parts by weight of the nonvolatile content in terms of nonvolatile content. 125 parts by weight (30 parts by weight) with respect to (24 parts by weight).

  The blending amount of 80 to 250% with respect to 100 parts by weight of the nonvolatile content of the water repellent resin is a blending amount of metal oxide of 48 to 150 parts by weight with respect to 100 parts by weight of the entire water repellent resin before volatilization. . That is, as a photocatalyst coating material having a deodorizing function and an antibacterial function, it is important to blend 50% or more of a metal oxide with respect to the blended weight part of the water-repellent resin binder.

Even when titanium oxide ST-01 having a large adsorption surface area (made by Ishihara Sangyo Co., Ltd .: adsorption surface area 300 m ² / g) is used, the back reaction is remarkably caused by photocatalytic action in Comparative Product 1 using a hydrophilic polymer as a resin binder. The material is eroded violently. Further, it can be seen that Comparative Product 2 in which titanium oxide having a small adsorption surface area is blended with a water-repellent oligomer does not cause a back reaction but does not exhibit a photocatalytic action.

  As described above, by preparing a photocatalyst coating material containing a predetermined amount (50% or more) of porous titanium oxide in a water-repellent resin binder and applying it to indoor interior products, a photocatalyst having a deodorizing function and an antibacterial function Activity can be imparted.

  In addition, it is preferable to apply the photocatalyst paint to the curtain because it is in an environment in which sunlight falls, so that a more effective photocatalytic function is exhibited.

  Of course, even if there is no sunlight, the photocatalytic activity is excited even in indoor light, so that a predetermined effect can be imparted to interior parts such as carpets and sofas.

  Furthermore, when the photocatalyst paint is applied to the wallpaper, a water-repellent resin binder is applied to give the wallpaper a photocatalytic function such as a deodorizing function and an antibacterial function, providing durability, and repelling the wallpaper. Water treatment can be performed, and a surface treatment for a new water repellent treatment is not required, which is more preferable.

  Since the photocatalyst paint according to the present invention is not hydrophilic, it is unsuitable for measures against environmental contamination that requires moisture, but is very effective for indoor environments where a deodorizing function or an antibacterial function is desired. In addition, since the water-repellent resin binder is used, the base material and the resin binder itself are not deteriorated by the photocatalytic action, and the life is increased and the durability is improved.

  Furthermore, since the undercoating is not necessary at the time of application, it may be applied once, and the application operation is simplified and can be applied in a short time.

  In addition, since the coating film thickness may be 5 μm or more by brushing or spraying, a coating film having a sufficient photocatalytic function can be formed even by a single coating operation.

Claims (5)

  A photocatalyst paint comprising a water-repellent resin binder and a metal oxide having a photocatalytic function.   The blending ratio of the metal oxide is 50% or more of the blending part of the water-repellent resin binder, and the blending amount is 80% to 250% of the non-volatile part of the water-repellent resin binder. The photocatalyst coating material according to 1.   The photocatalyst coating material according to claim 1 or 2, wherein the metal oxide is porous titanium oxide.   An indoor interior product, wherein the photocatalyst paint according to any one of claims 1 to 3 is applied to a thickness of 5 µm or more. A wallpaper, wherein the photocatalyst paint according to any one of claims 1 to 3 is applied to a thickness of 5 µm or more.