Aqueous functional interior finish coating material

Abstract

To provide an aqueous interior finish coating material capable of forming a good internal surface with no powder attached, fundamental as an interior finish coating material, as well as effectively preventing in-room dew from condensing, and preventing molds or mites from appearing after application thereof, the aqueous interior finish coating material usable while capable of removing an irritation substance considered as a causative substance of a sick house syndrome or an acidic gas moving in the air together with water vapor.SOLUTION: An aqueous interior finish coating material is used applying onto an internal surface. The aqueous interior finish coating material includes 30 mass% or more light-weight inorganic porous material blended, and includes at least two kinds of organic powdered resins including poval and powdered acrylic resin blended as a fixation agent. The aqueous interior finish coating material includes an anti-skinning / wrinkle prevention agent added for delaying surface dryness in curing a cement based coating material, has moisture control properties measured in accordance with JIS6909 of 200 g / m2 or more, and has a function of removing a volatile harmful chemical substance.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a water-based functional interior finishing coating material (hereinafter also referred to as "functional interior finishing coating material") that is used by mixing with water, and more specifically to a technology for providing a functional interior finishing coating material that, when applied to interior wall surfaces as an interior finishing coating material, has high humidity control properties that can ensure a state in which condensation can be suppressed indoors, and is also capable of removing volatile harmful chemical substances (also called irritating substances) such as formaldehyde that are released indoors due to building materials, interior materials, furniture, etc., with reduced powdering on the applied surface, high humidity control properties, and excellent functionality that can remove irritating substances indoors. [Background technology]

[0002] In recent years, as homes and other buildings have become increasingly airtight, the incidence of allergies caused by living environments, known as "sick building syndrome," has increased. Allergens are thought to be caused by physical allergens such as mold and dust mites, as well as chemical allergens, such as volatile harmful chemicals like formaldehyde, which irritate human mucous membranes. To address this issue, various functional coating materials for indoor use have been developed that offer humidity control and excellent adsorption capabilities against gaseous irritants (see Patent Documents 1-3, etc.), some of which have already been commercialized. As another approach, the revised Building Standards Act has come into effect, and ventilation measures such as the installation of ventilation equipment to ensure sufficient indoor ventilation, such as the introduction of 24-hour ventilation systems, have been implemented. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-101436 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-211049 [Patent Document 3] Patent No. 4634696 Summary of the Invention [Problem to be solved by the invention]

[0004] However, despite the above-mentioned measures, the increase in allergy sufferers suffering from sick house syndrome has not been prevented. The inventor believes that the reason for this is that conventional functional coating materials lack sufficient humidity-regulating capabilities, and are unable to prevent indoor condensation and the growth of mold and dust mites. Furthermore, it is believed that ventilation using ventilation equipment creates areas in the room where air flow is limited, and this is why irritating substances are not removed to a level that does not cause health damage.

[0005] Furthermore, only formaldehyde has been emphasized as an allergen causing sick building syndrome, and the effects of acidic gases such as NOx and SOx on the human body have not been evaluated extensively. However, acidic gases acidify the body, leading to the excessive production of active oxygen, which can cause various diseases and contribute to the onset of allergies. Furthermore, the above-mentioned acidic gases are hydrophilic and travel in the air along with water vapor. Since water vapor is the most abundant gas in the air, their effects on the human body are unavoidable. The present inventors recognized that air conditioning performance is an important performance, and that achieving excellent humidity control performance to effectively prevent indoor condensation is an extremely effective means for realizing an indoor environment that is resistant to sick building syndrome, especially in terms of addressing the above-mentioned acidic gases.

[0006] Therefore, the object of the present invention is to develop a useful water-based functional interior finishing coating material that ensures the basic required performance of an interior coating material, and in addition to forming a good, powder-free interior wall surface, can effectively prevent condensation indoors, thereby suppressing the growth of mold and dust mites that occur after application, and can remove irritating substances such as formaldehyde, which are believed to be the cause of sick building syndrome, and acidic gases such as NOx and SOx that travel in the air together with water vapor.The ultimate object of the present invention is to realize the above-mentioned means, thereby ensuring a good indoor environment that can address sick building syndrome, providing a comfortable living environment for occupants, and improving the symptoms of asthma and atopy. [Means for solving the problem]

[0007] The above object can be achieved by the present invention, which provides the following functional interior finishing coating material. [1] A water-based functional interior finishing coating material used on interior walls as a finishing coating material for interior use, This product contains 30% by mass or more of a lightweight inorganic porous material, and contains at least two types of organic powder resins, including poval and powdered acrylic resin, as a hardening agent. It also contains an anti-skinning and anti-wrinkle agent to delay the surface drying during hardening of the cement-based coating material. Its moisture conditioning ability measured in accordance with JIS6909 is 200 g / m. 2 The above-mentioned water-based functional interior finishing coating material is characterized by having the function of removing volatile harmful chemical substances.

[0008] Preferred examples of the above-mentioned functional interior finishing coating materials include the following. [2] The water-based functional interior finishing coating material according to [1] above, wherein the lightweight inorganic porous material comprises three components: silica gel, activated clay, and Wakkanai Formation siliceous shale. [3] The moisture conditioning property is 250 g / m 2 The water-based functional interior finishing coating material according to [1] or [2] above. [4] A water-based functional interior finishing coating material according to any one of [1] to [3] above, wherein the anti-skinning and anti-wrinkle agent for delaying the surface drying during hardening of the cement-based coating material is a mixture containing silica, a higher alcohol, a nonionic surfactant, and water. [5] The water-based functional interior finishing coating material according to any one of the above [1] to [4], further comprising aluminum hydroxide. [Effects of the Invention]

[0009] According to the present invention, in addition to forming a good, powder-free wall surface, which is a basic requirement for an interior coating material, it is possible to prevent condensation indoors, thereby suppressing the growth of mold and dust mites, and it is also possible to adsorb and remove acidic gases such as NOx and SOx that travel in the air together with water vapor, while at the same time removing irritating substances such as formaldehyde, which is believed to be a causative agent of sick building syndrome. This provides a useful functional interior finishing coating material that can simultaneously achieve high humidity control performance and the ability to remove irritating substances. By realizing the above-mentioned useful functional interior finishing coating material, it is possible to ensure an indoor environment that can address sick building syndrome, provide a comfortable living environment for residents, and improve the symptoms of asthma and atopy.

[0010] The present invention addresses the issue of acidic gases such as NOx and SOx, which, unlike formaldehyde, have not been widely recognized as allergens causing sick building syndrome. This issue is resolved by incorporating a lightweight inorganic porous material into the coating material at a high ratio of 30% by mass or more, more preferably by using a lightweight inorganic porous material composed of three components: silica gel, activated clay, and Wakkanai siliceous shale, while still allowing for the formation of a good, powder-free wall surface. The inventors believe that, since acidic gases such as NOx and SOx, which are hydrophilic, travel in the air together with water vapor, they are adsorbed stably along with water vapor by the lightweight inorganic porous material, which is incorporated at a high ratio of 30% by mass or more, confining acidic gases such as NOx and SOx within the pores of the inorganic porous material, resulting in the remarkable effects of the present invention. Furthermore, according to the inventor's research, the gas adsorption performance differs depending on the lightweight inorganic porous material used, and since there are advantages and disadvantages depending on the type of gas, it is more effective to use a mixture of multiple different types of porous materials rather than using a single material. According to the inventor's research, by using a lightweight inorganic porous material at a high ratio of 30% by mass or more, for example, as a mixture containing three components: silica gel, activated clay, and Wakkanai siliceous shale, the effect of adsorbing and removing a wider range of target gases can be achieved. Therefore, the functional interior finishing coating material of the present invention having the above-mentioned configuration is particularly expected as a method for reducing allergens, which are believed to be the cause of sick building syndrome, which is caused by various substances. DETAILED DESCRIPTION OF THE INVENTION

[0011] Preferred embodiments of the present invention are described below, but the present invention is not limited to the following embodiments. The present inventors have recognized that, in light of the recent rapid global warming, the use of air conditioners has become essential, and that, in light of the increasing demand for efficient energy use, the airtightness of indoor spaces, such as homes, has become increasingly important. They have also recognized that the quality of interior finishing materials, particularly those constituting interior wall surfaces, is crucial to creating a good indoor environment. Specifically, first, it is necessary to effectively prevent indoor condensation. Achieving this goal will suppress the growth of mold and dust mites, and will also effectively remove acidic gases, such as NOx and SOx, that travel in the air along with water vapor. According to the inventors' research, in order to prevent indoor condensation, an interior finishing material constituting an interior wall surface must have a humidity control capacity of 200 g / m2, as measured in accordance with JIS 6909, the Japanese Industrial Standard. 2 More preferably, 250 g / m 2 It is necessary to use functional building materials that stably exhibit high humidity control properties of 200 g / m or more. 2 The present invention was arrived at by discovering an interior finishing material that can stably ensure the high humidity conditioning properties described above.

[0012] Furthermore, in order to achieve the object of the present invention as stated above, it is necessary for the interior finishing material constituting the surface of the interior wall of a room to have, in addition to the above-mentioned functions, the function of removing volatile harmful chemical substances (irritating substances) such as formaldehyde, and the acidic gases such as NOx and SOx mentioned above. As a result of the inventor's investigations, it was found that the humidity conditioning ability of 200 g / m2 found above can be achieved. 2 or more, and even 250 g / m 2 It has been discovered that the interior finishing material, which is capable of stably exhibiting the high humidity control properties described above, also has an excellent function of removing irritating substances that cause sick house syndrome, in addition to the high humidity control performance described above.

[0013] Regarding moisture control, the Japanese Industrial Standard JIS6909 states that when applied to gypsum board, the moisture control ability is 70g / m 2 When the above conditions are met, the product is certified as a "humidity-controlling finishing material." For this reason, products exhibiting significantly lower levels of functionality than the high humidity-controlling performance targeted by and defined in the present invention are commercially available as humidity-controlling finishing materials. However, according to the inventor's investigations, these products are not only unable to prevent condensation indoors, but also clearly insufficient in terms of removing irritating substances and the like that can cause sick building syndrome. Below, we will explain how the inventor was able to realize an interior finishing coating material with excellent functionality that can achieve the objectives of the present invention, and the composition of the functional interior finishing coating material of the present invention.

[0014] (Why conventional products have poor humidity control) According to the inventors' investigations, when developing an interior finishing coating material with excellent humidity control, it is necessary to mix 30% by mass or more of lightweight inorganic porous materials, such as silica gel, activated clay, and Wakkanai siliceous shale, which themselves have excellent humidity control properties, as raw materials in order to achieve a humidity control performance of 200 g / m. 2 It is not possible to obtain a coating material that exhibits the above. On the other hand, according to the inventor's research, coating materials prepared by blending lightweight inorganic porous materials such as silica gel, activated clay, and Wakkanai Formation siliceous shale in proportions of 30% by mass or more have the fundamental defect that, when water is added during application, the fine, lightweight materials such as silica gel, activated clay, and Wakkanai Formation siliceous shale, which have excellent humidity-regulating properties, float to the surface, leaving the coated surface in a "powdery" state and preventing the formation of a strong film. In other words, interior finishing coating materials blended with a high proportion of lightweight inorganic porous materials with excellent humidity-regulating properties of 30% by mass or more cannot eliminate the "powdery" that occurs on the surface of interior walls after application, which is a serious problem in that they cannot be used as interior products.

[0015] As described above, due to the occurrence of the above-mentioned problems, conventional products cannot be blended with the lightweight inorganic porous material at a high ratio of 30 mass % or more, and products with high humidity control properties cannot be realized.2 In order to confirm that the humidity control function of a product with a high humidity control ability of "more than 100g / m" was not consistently achieved, the humidity control ability of various "interior finishing coating materials" that are commercially available and are said to have humidity control functions was measured. As a result, most products had a humidity control ability of 100g / m 2 It was also confirmed that the humidity control capacity was less than 100g / m 2 Although there were some products with more than 200g / m 2 or more, and even 250 g / m 2 No product was found that stably exhibited such high humidity conditioning performance. Humidity conditioning performance was measured in accordance with JIS 6909 as follows. Test pieces were prepared by applying the coating material to a gypsum board substrate in a thickness of approximately 2 mm. Each test piece was first left to stand in an environment with a temperature of 23°C and a humidity of 45% for 24 hours, then left to stand in an environment with a temperature of 23°C and a humidity of 90% for 24 hours, and then left to stand in an environment with a temperature of 23°C and a humidity of 45% for 24 hours. After this, the amount of absorption and release was measured to determine the humidity conditioning performance (g / m 2 ) was sought.

[0016] (Regarding the functional interior finishing coating material of the present invention) The present inventors first conducted extensive research to prevent the powdery surface that occurs when a lightweight inorganic porous material with excellent humidity control is incorporated at a high concentration of 30% by mass or more. After extensive research into methods for preventing surface powdering, they confirmed that the use of dispersants and water-reducing agents commonly used in interior finish coatings does not solve the powdery surface problem. In response, the present inventors discovered that adding an anti-skinning and anti-wrinkle agent, which is used in cement-based coatings but not used in interior finish coatings, to slow the drying rate of the coated surface of the interior finish coating and strengthen the surface film, thereby preventing the powdery surface that occurs on coatings containing a high concentration of a lightweight inorganic porous material with excellent humidity control at a concentration of 30% by mass or more. Furthermore, they discovered that a small amount of the anti-skinning and anti-wrinkle agent is sufficient. Specifically, it was found that adding about 0.5 to 1.5% by mass to 100% of the coating material of the present invention is sufficient. Based on the above findings, the inventors believed that adding an "anti-skinning and anti-wrinkle agent to delay the surface drying of the cement-based coating material when it hardens" would be effective in achieving the object of the present invention, and after further investigation, they arrived at the present invention.

[0017] The functional interior finishing coating material of the present invention requires high humidity control performance capable of preventing indoor condensation, so its formulation must contain at least 30% by mass of lightweight inorganic porous material, and at the same time, to achieve the aforementioned prevention of "powdery adhesion," it is necessary to add an "anti-skinning / anti-wrinkle agent to delay surface drying during hardening of the cement-based coating material." In addition to the above-mentioned composition, the present invention has found that by incorporating at least two types of organic powder resins, including poval and powdered acrylic resin, as solidifying agents, it is possible to obtain even better and more stable effects.

[0018] The lightweight inorganic porous material constituting the present invention is preferably a lightweight material such as silica gel, activated clay, or Wakkanai Formation siliceous shale. According to the inventor's research, all of these materials exhibit excellent humidity control properties, and by incorporating them in amounts of 30% by mass or more as components of an interior finishing coating material, high humidity control properties can be achieved. As mentioned above, the inventor's extensive research has led to the discovery that, in the present invention, which aims to address the various causative substances (components) of sick building syndrome, many of which are still unclear, a more effective effect can be achieved by using a mixture of silica gel, activated clay, and Wakkanai Formation siliceous shale, which exhibit high humidity control properties and have different adsorption properties. When using a mixture of these three materials, it is preferable to use a mixture of, for example, approximately 20-35% silica gel, approximately 5-10% activated clay, and approximately 3-10% Wakkanai Formation siliceous shale, with the functional interior finishing coating material of the present invention being 100% by mass, so that the total amount of these materials is 30% or more. The incorporation of silica gel, activated clay, and Wakkanai siliceous shale enhances the moisture-regulating properties of coating materials, and all of these materials exhibit high adsorption properties for irritants and other substances. Furthermore, by combining these three materials, it is possible to provide interior finishing coating materials with superior functionality, including high moisture-regulating properties and high adsorption properties for gas components such as formaldehyde and acidic gases such as NOx and SOx. Thus, the present invention not only achieves the basic performance requirement for interior coating materials, which is a good condition without "dusting," but also provides a highly functional and useful interior finishing coating product that exhibits high moisture-regulating properties not achieved by conventional products and can significantly contribute to the reduction of allergens associated with sick building syndrome, a condition for which many aspects remain unclear. According to the inventors' investigations, by using a mixture of silica gel, activated clay, and Wakkanai siliceous shale, the functional interior finishing coating materials of the present invention can more easily achieve the "moisture-regulating properties measured in accordance with JIS 6909" specified in the present invention. 2 This will enable stable achievement of high humidity control performance of "more than 100%."

[0019] According to the inventors' investigations, when silica gel or activated clay is used as the lightweight inorganic porous material constituting the functional interior finishing coating material of the present invention, for example, if conventional slaked lime is added as a solidifying agent, there is a concern that the strong alkali will react with the silica gel or activated clay, shortening the curing time and resulting in a coating material product with poor workability. Therefore, when using silica gel or activated clay as the lightweight inorganic porous material constituting the functional interior finishing coating material of the present invention, it is necessary to prepare it so that slaked lime is not used as a solidifying agent. As mentioned above, silica gel and activated clay are extremely useful lightweight inorganic porous materials in the present invention, and their use is desired. Therefore, the functional interior finishing coating material of the present invention uses at least two organic powder resins, including poval (polyvinyl alcohol) and powdered acrylic resin, as solidifying agents. Poval is a water-soluble and water-resistant organic powder resin, which is useful in the present invention, while powdered acrylic resin is an adhesive resin that is well-used in vinyl chloride wallpaper and the like, which is also useful in the present invention. According to the investigations of the present inventors, it is sufficient to use these solidifying agents in an amount of about 0.3 to 5% each, based on the functional interior finishing coating material of the present invention as 100% by mass.

[0020] As described above, the aqueous functional interior finishing coating material of the present invention uses at least two specific organic powder resins as a solidifying agent instead of conventional slaked lime. In this case, depending on the amount of these resins used, there is a concern that it may not be possible to form a coating surface that exhibits sufficient flame retardancy (non-flammability). As a precaution against this, for example, aluminum hydroxide can be added to the aqueous functional interior finishing coating material of the present invention. According to the inventor's research, by adding aluminum hydroxide, flame retardancy (non-flammability) can be effectively imparted to the surface of the interior wall formed with the aqueous functional interior finishing coating material of the present invention.

[0021] The functional interior finishing coating material of the present invention is a coating material containing 30% by mass or more of a lightweight inorganic porous material as described above, and has a moisture conditioning property of 200 g / m2 as measured in accordance with JIS6909. 2 It is necessary to have a density of at least 250 g / m 2 The present invention solves the problem of "powdery" on the surface of a coating film that occurs when a lightweight inorganic porous material is blended at 30% by mass or more by adding an "anti-skinning and anti-wrinkle agent to delay the surface drying of the cement-based coating material when it hardens," and at the same time, it makes it possible to realize a water-based functional interior finishing coating material that has high humidity control performance and the ability to remove irritating substances such as formaldehyde, which are believed to be the cause of sick building syndrome, and acidic gases such as NOx and SOx.

[0022] The "anti-skinning and anti-wrinkling agent for delaying surface drying during hardening of cement-based coating materials" that characterizes the present invention can be, for example, a mixture containing silica, a higher alcohol, a nonionic surfactant, and water. According to the inventor's research, the addition of such a mixture effectively prevents lightweight inorganic porous materials, which are used in high amounts of 30% by mass or more, from floating on the coated surface. At the same time, by delaying the drying of the coated surface during hardening of the coating material, application problems caused by the drying of the coating surface in summer are also solved. Commercially available "anti-skinning and anti-wrinkling agents for delaying surface drying during hardening of cement-based coating materials" that can be suitably used in the present invention include, for example, SN Clean Act 900 (trade name, manufactured by San Nopco Co., Ltd.), which is sold for use in cement-based coating materials.

[0023] As mentioned above, the "anti-skinning and anti-wrinkle agent for delaying surface drying during hardening of cement-based coating materials" that characterizes this invention can achieve its useful effects with the addition of a small amount. Specifically, the effects of this invention can be achieved by incorporating approximately 0.5 to 1.5% by mass of the functional interior finishing coating material of this invention into 100% of the functional interior finishing coating material of this invention. The functional interior finishing coating material of this invention is provided as a powder product, which is mixed with water and applied when used. [Example]

[0024] The present invention will be described in more detail below with reference to examples and comparative examples. However, the present invention is not limited to the following examples. % is by mass unless otherwise specified.

[0025] [Example] The lightweight inorganic porous materials, additives specific to the present invention, solidifying agents, and other additives used in the examples and comparative examples are summarized below. The blending amounts in the examples and comparative examples are shown in Table 1. The materials used are as follows: (1) Inorganic porous materials Wakkanai Formation siliceous shale: Wakkanai Formation siliceous shale with a grain size of approximately 70 μm (manufactured by Suzuki Sangyo Co., Ltd.) Activated clay: Acid clay with a particle size of approximately 70 μm (clay mainly composed of montmorillonite, which is activated in a natural acidic environment and has adsorption properties) Silica gel: for interior finishing coatings with a particle size of approximately 70 μm

[0026] (2) Additives specific to the present invention SN Clean Act 900 (product name, sold as a cement skinning inhibitor, manufactured by San Nopco Ltd.)

[0027] (3) Solidifying agent Adhesive organic powder resin: Powdered acrylic resin with an average particle size of about 1 μm used as an adhesive for vinyl chloride. Water-resistant organic powder resin: Poval (polyvinyl chloride alcohol) Slaked lime: (for interior finishing coatings, used in the comparative examples)

[0028] (4) Other additives Aluminum hydroxide: flame retardant Cotton powder: organic fiber (for interior finishing coatings) Methylcellulose: Water-soluble thickener (for interior finishing coatings) Pigment: Titanium dioxide (for interior finishing coatings) (5) Inorganic fillers Calcium carbonate powder: for finishing coatings with particle sizes of approximately 100 μm or less

[0029] [evaluation] (1) Humidity control In accordance with JIS 6909, test pieces were prepared by applying a coating material to a thickness of 2 mm on gypsum board, and the humidity conditioning properties were measured in the same manner as described above. The measurement results are shown in Table 1. The appearance was also visually observed, and the evaluation was made as follows: if no powder was observed on the surface, it was marked as ○; if powder was observed, it was marked as ×.

[0030] (2) Ability to remove irritating substances (formaldehyde) The test specimens for evaluation were placed in a sealed container (Tedlar bag), sealed, and 100 ppm of formaldehyde was injected and allowed to diffuse into the container, then left to stand at 25°C. After 1 hour, the formaldehyde concentration in the sealed container was measured. The test specimens for evaluation placed in each sealed container were test specimens of the same size, each coated with the same amount of the coating material from the example and comparative example on the surface of the gypsum board. The formaldehyde removal rate was calculated from the formaldehyde concentration in the container before and after the test, and the removal effect was evaluated on the following three levels. ◎: Removal rate was 80% or more. ○: The removal rate was 50% or more but less than 80%. ×: The removal rate was less than 50%.

[0031] (3) Flame retardancy A flame was applied to a test piece of gypsum board coated with each coating material to a thickness of 2 mm, and the non-combustibility was visually confirmed and evaluated according to the following criteria. ○: It did not burn even after 10 minutes or more of exposure to flame. ×: Burned areas were observed within 10 minutes of application of flame.

[0032] TIFF2025122718000001.tif147170

Claims

1. A water-based functional interior finishing coating material used on interior walls as a finishing coating material for interior use, The coating material is blended with 30% by mass or more of a lightweight inorganic porous material, and at least two types of organic powder resins including poval and powdered acrylic resin are blended as a solidifying agent. In addition, an anti-skinning and anti-wrinkle agent is added to delay the surface drying during hardening of the cement-based coating material. The moisture conditioning property measured in accordance with JIS 6909 is 200 g / m ２ The above-mentioned water-based functional interior finishing coating material is characterized by having the function of removing volatile harmful chemical substances.

2. 2. The water-based functional interior finishing coating material according to claim 1, wherein the lightweight inorganic porous material comprises three components: silica gel, activated clay, and Wakkanai siliceous shale.

3. The moisture conditioning property is 250 g / m ２ The water-based functional interior finishing coating material according to claim 1 or 2.

4. The water-based functional interior finishing coating material according to claim 1 or 2, wherein the anti-skinning and anti-wrinkle agent for delaying the surface drying during hardening of the cement-based coating material is a mixture containing silica, a higher alcohol, a nonionic surfactant and water.

5. 3. The water-based functional interior finishing coating material according to claim 1, further comprising aluminum hydroxide.

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