JP2006249717A - Finishing method of outer wall material surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a finishing method for providing an outer wall material superior in adhesion and coating film physical properties of the outer wall material and a coating film painted on its surface, reducing a variation in an appearance and an external appearance, and having an aesthetic appearance and a natural appearance having a depth. <P>SOLUTION: Before installing a fiber reinforced cement outer wall material on an outer wall of a building, backing processing by a permeable water repellent agent is performed on the surface of the fiber reinforced cement outer wall material, and next, paint including an extender pigment, a color pigment and a silicone resin is applied by using a trowel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for finishing a building outer wall surface, and more particularly to a method for finishing a surface of an outer wall material attached to an outer wall of a building such as a building, a condominium, or a public facility.

  Conventionally, inorganic building materials such as lightweight concrete, precast concrete, lightweight foamed concrete (ALC), mortar, asbestos cement board, pulp cement board, wood wool cement board, fiber reinforced cement board, calcium silicate board, gypsum board, brick, etc. Since it is excellent in nonflammability, lightness, heat insulation, sound insulation, etc., it is widely used as a building exterior wall material. And the surface of these outer wall materials is painted to give beauty.

  However, since such an outer wall material is always exposed to the outdoors, it is exposed to water such as rainwater, and alkaline components such as calcium hydroxide contained in these building materials are eluted to the surface by water, which is carbonated. By reacting with the gas, a white phenomenon (eflorescence) is generated and the appearance is remarkably impaired, or a deterioration phenomenon such as being neutralized by being promoted by water or carbon dioxide gas occurs. Among them, inorganic porous building materials such as fiber reinforced cement boards are lightweight and strong building materials, but they are porous and have excellent water absorption and easily penetrate into rainwater. Therefore, the outer wall material composed of such building materials is likely to cause performance deterioration such as durability and contamination / deterioration of the surface layer.

  In order to maintain the durability and aesthetics of these outer wall materials over a long period of time, generally, the outer wall material is made waterproof by applying an undercoat called a sealer or primer to the surface of the outer wall material. Yes.

In addition, a technique for applying waterproof properties to an outer wall material by applying various water repellents is also widely used. For example, in Patent Document 1 below, a water repellent containing an alkoxy group-containing silane compound is applied / penetrated. The outer wall material is made waterproof.
JP-A 63-256581

  However, if a coating layer made of a sealer or the like is formed on the surface layer of the outer wall material, air permeability is impaired and moisture tends to be trapped. For this reason, blistering or the like tends to occur on the finished surface, and the aesthetic appearance is likely to be impaired. In addition, since sufficient waterproofness cannot be exhibited unless a relatively thick film is applied, it is necessary to coat several times and keep the film thickness sufficiently.

  Moreover, by applying and penetrating a water repellent, the outer wall material can be waterproofed while maintaining air permeability, but the adhesion to the overcoating material coated thereon tends to be insufficient.

  On the other hand, stucco (Western plaster) or plaster can be used to paint building exterior wall materials, but it can be made into an exterior wall material with a deep aesthetic and natural texture, but the climate in Japan is relatively hot and humid. Therefore, it takes time to cure and form the coating film, and the construction period tends to be long. In addition, these coating films are likely to be deteriorated by the influence of acid rain, and appearance defects such as discoloration, cracks, and peeling are likely to occur.

  Furthermore, when surface finishing is performed by painting the exterior wall of the building to which the outer wall material is attached in the field, the working environment such as scaffolding is poor for large buildings such as high-rise buildings. Unevenness tends to occur, and unevenness tends to occur in the finished feeling due to drying conditions such as temperature, humidity, and solar radiation. Especially when finishing with plaster, etc., it is difficult to apply a finish with a deep aesthetics or natural texture with a brush, roller, spray, etc., as with ordinary paints. However, the skill difference of the contractor is likely to appear remarkably in the ironing finish on the spot.

  Therefore, the object of the present invention is an outer wall material having excellent adhesion and coating film physical properties between the outer wall material and the coating film coated on the surface thereof, and having a deep aesthetic appearance and natural texture with little variation in texture and appearance. It is to provide the resulting finishing method.

  In order to solve the above problems, the method for finishing the surface of an outer wall material according to the present invention provides a permeable water repellent agent on the surface of the outer wall material made of fiber reinforced cement before the outer wall material made of fiber reinforced cement is attached to the outer wall of a building. The surface treatment is performed by the following, and then a paint containing extender pigment, coloring pigment and silicone resin is applied using a trowel.

  Further, in the present invention, the paint is 50 to 70% by mass of the extender pigment in terms of solid content, 1 to 20% by mass of the color pigment in terms of solid content, and the silicone resin is solid based on the total amount of solid content in the paint. A paint containing 8 to 18% by mass in terms of minutes is preferable. And it is preferable that the said permeable water repellent is polyalkyl alkoxysiloxane. Moreover, it is preferable to finish the surface of the outer wall material indoors. And it is preferable to finish the outer wall material surface following the manufacturing process of the fiber reinforced cement outer wall material.

  According to the present invention, by applying a permeable water repellent to the surface of the outer wall material made of fiber reinforced cement as a base treatment, the outer wall material can be highly waterproof while maintaining the breathability of the outer wall material. Can do. Accordingly, it is possible to prevent alkali deterioration of the outer wall material and the surface layer portion subjected to surface finishing.

  In addition, by using a paint containing extender pigments, color pigments, and silicone resin as a paint for finishing the outer wall material, it is strong while maintaining sufficient adhesion with the outer wall material to which the permeable water repellent is applied. It is possible to form a coating film having excellent coating film properties and maintain aesthetics over a long period of time.

  Furthermore, before attaching to the outer wall of the building, the paint can be applied to the surface of the outer wall material with a trowel and finished, so that the construction and drying conditions can be kept constant, and there is a difference in the skills of the contractor. Variations in the finish feeling due to can be reduced, and finish with a deep aesthetics and natural texture can be applied.

  And since the beauty and natural texture which have the depth like a stucco can be given to the exterior wall of the building which attached this exterior wall material, it can be set as a beautiful exterior wall.

  The surface finishing method of the present invention is a surface finishing method for an outer wall material made of fiber reinforced cement, and after applying a water-repellent water repellent to the outer wall material made of fiber reinforced cement, Apply. Hereinafter, the present invention will be described in detail together with embodiments thereof.

  The fiber reinforced cement outer wall material that can be used in the present invention is a fiber reinforced cement outer wall material that is generally used as an outer wall material, and is made of cement, calcareous raw material, siliceous raw material, slag gypsum, etc. A material obtained by mixing a reinforcing fiber with the cement composition is formed into a plate shape by a method such as press molding, and the plate shape is subjected to autoclave curing or normal pressure curing and cured.

  As the cement composition, for example, a cement composition containing amorphous silica powder disclosed in JP-A-1-145357 can be used.

  As the reinforcing fiber, for example, alkali-resistant glass fiber, steel fiber, carbon fiber, aramid fiber, vinylon fiber, or the like made into chopped strand, chopped strand mat, or continuous strand mat can be used.

  By applying and penetrating a permeable water repellent to the fiber reinforced cement outer wall material and forming a water repellant layer on the surface layer, the fiber reinforced cement outer wall material can be waterproof.

  As the permeable water repellent that can be used in the present invention, organoalkoxysilane or organopolysiloxane is preferable, organopolysiloxane is more preferable, and polyalkylalkoxysiloxane is particularly preferable. Among the above water repellents, the water repellent mainly composed of polyalkylalkoxysiloxane can provide excellent water repellency while maintaining the breathability of the outer wall material.

  As organoalkoxysilane, methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltripropoxysilane, propyltrimethoxysilane, propyltriethoxysilane, propyltripropoxysilane , Butyltrimethoxysilane, Butyltriethoxysilane, Hexyltrimethoxysilane, Hexyltriethoxysilane, Phenyltrimethoxysilane, Phenyltriethoxysilane, Benzyltrimethoxysilane, Octyltrimethoxysilane, Octyltriethoxysilane, Octyltripropoxy Silane, decyltrimethoxysilane, dodecyltrimethoxysilane, octadecyltrimethoxysilane, tetradecyltrimethoxy Silane, tetradecyltriethoxysilane, hexadecyltrimethoxysilane, hexadecyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, dibutyldimethoxysilane, perfluoromethylethyltrimethoxysilane, perfluorooctylethyltrimethoxysilane, etc. Preferred are hexyltrimethoxysilane, hexyltriethoxysilane, decyltrimethoxysilane, and perfluorooctylethyltrimethoxysilane.

  Examples of the organopolysiloxane include dimethylpolysiloxane, methylphenylpolysiloxane, alkyl-modified polysiloxane, polyalkylalkoxysiloxane, and the like, and polyalkylalkoxysiloxane is preferable.

  The paint that can be used in the present invention is a paint containing extender pigments, color pigments, and a silicone resin.

  The paint having the above composition has high adhesion to the outer wall material subjected to the base treatment with the permeable water repellent, and also has good moisture permeability, water resistance and durability of the coating film itself. A beautiful stucco-like aesthetic can be maintained.

  As extender pigments, the same extender pigments used in general paints can be used. For example, calcium carbonate, barium sulfate, alumina white, silica powder, clay and the like can be mentioned.

  The amount of the extender pigment in the coating is preferably 40 to 80% by mass, more preferably 50 to 70% by mass, and even more preferably the total solid content in the coating in terms of solid content. Is 55-65 mass%.

  As the color pigment, the same color pigments as those used in general paints can be appropriately selected and used according to the color required for the outer wall. For example, titanium oxide, lead white (basic carbonic acid) Lead), zinc white (zinc oxide), antimony trioxide, carbon black, yellow lead (lead chromate), yellow iron oxide (hydrous ferric oxide), brown (ferric oxide), cadmium pigment, cobalt Examples thereof include pigments and copper pigments.

  And it is preferable that the compounding quantity in the coating material of a color pigment is 0.1-30 mass% in conversion of solid content with respect to the total amount of solid content in a coating material, More preferably, it is 1-20 mass%. More preferably, it is 3-15 mass%.

  As a silicone resin, it is resin comprised from organopolysiloxane, For example, a methyl silicone resin, a phenylmethyl silicone resin, a modified silicone resin etc. can be used. Examples of the modified silicone resin include silicone alkyd resin, epoxy-modified silicone resin, acrylic-modified silicone resin, polyester-modified silicone resin, phenol-modified silicone resin, melamine-modified silicone resin, and urethane-modified silicone resin. From the viewpoint of environmental load, it is preferable to use it as a silicone resin emulsion using water as a medium.

  And it is preferable that the compounding quantity in the coating material of a silicone resin is 5-20 mass% in conversion of solid content with respect to the total amount of solid content in a coating material, More preferably, it is 8-18 mass%, More preferably. Is 10 to 15% by mass.

  Furthermore, various additives such as plasticizers, curing agents, pigment dispersants, emulsifiers, thickeners and the like similar to those used in ordinary paints may be appropriately selected and used as necessary.

  And it is preferable that the compounding quantity in the coating material of these various additives is 1-10 mass% in conversion of solid content with respect to the total amount of solid content in a coating material, More preferably, it is 3-8 mass%.

  It can be obtained by mixing the above extender pigment, color pigment, silicone resin and other various additives according to a conventional method. For example, extender pigments, color pigments, and additives are added and mixed in the silicone resin to sufficiently disperse each component. Thereafter, it is obtained by adding an appropriate amount of a solvent so as to obtain a desired concentration and viscosity according to the application.

  The solvent for dilution is preferably water from the viewpoint of the environment. And it is preferable to add and adjust a solvent so that solid content concentration in a coating material may be 40-80 mass%, More preferably, it is 50-70 mass%. Further, the viscosity of the coating is preferably a value measured with a Stormer viscometer (20 ° C.) and adjusted by adding a solvent so as to be 100 to 150 ku, more preferably 110 to 130 ku. If the solid content concentration and the viscosity in the coating are within the above-mentioned ranges, workability is good and practically appropriate. The solid content concentration and the viscosity may be adjusted as appropriate according to the coating conditions and the texture required for the outer wall material, and may be outside the above ranges.

  Next, the surface finishing method of the outer wall material of the present invention will be described.

  The method for finishing the surface of the outer wall material of the present invention is characterized in that it is performed before the outer wall material is attached to the outer wall of a building, and it is preferable to perform surface finishing indoors, and a process for producing a fiber-reinforced cement outer wall material In order to increase productivity, it is more preferable to apply a surface treatment and surface finishing indoors. Moreover, you may surface-finish the outer wall material once stored in the warehouse after manufacture. By performing the surface finishing of the outer wall material made of fiber reinforced cement before being attached to the building, it is possible to keep the working conditions such as drying conditions constant and make the finished feeling almost uniform.

A permeable water repellent is applied to the outer wall material made of fiber reinforced cement, and a water repellent layer is formed on the surface layer portion of the outer wall material made of fiber reinforced cement to perform the base treatment. The penetrating water repellent is appropriately selected from conventional methods such as brush coating, trowel coating, roller coating, and spray coating, and is applied to the outer wall material made of fiber reinforced cement. Preferably the applied amount is 100 to 500 g / ^{m 3,} more preferably from 200~400kg / ^{m 3.} If the coating amount is less than 100 kg / m ³ , sufficient waterproofness may not be obtained, and if it is greater than 500 kg / m ³ , the air permeability of the outer wall material may be hindered.

  Further, the number of coatings is preferably 4 times or less, more preferably 2 times or less. When the number of times of coating increases, it takes time and workability is lowered.

  After the surface treatment, the paint containing the extender pigment, the color pigment, and the silicone resin is applied using a trowel that is conventionally used when applying plastering material such as plaster. By finishing with a trowel, it can be deep and have a natural texture. The applied paint is usually dried and cured by natural drying, but if necessary, heat drying or air drying can also be employed.

  Hereinafter, the present invention will be described in more detail with reference to examples.

[Example 1]
Permeable water-repellent agent obtained by dissolving a polyalkylalkoxysiloxane in an organic solvent on the surface of the outer wall material using a glass fiber reinforced cement board (trade name; “Suncrete” manufactured by Asahi Glass Building Wall Co., Ltd.) as the outer wall material. Was applied at a coating amount of 0.1 L / m ² with a roller and dried at room temperature for 1 hour, and then the same permeable water repellent was applied at a coating amount of 0.1 L / m ² with a roller. Then, the glass fiber reinforced cement board was ground-treated for 12 hours.

Then, 60% by mass of calcium carbonate as an extender pigment, 18% by mass of titanium oxide and 1% by mass of ferric oxide as a color pigment, respectively, in terms of solid content, based on the total amount of solids in the paint, thickener A coating material containing 8% by mass of an additive mainly containing 13% by mass of a modified silicone resin emulsion as a silicone resin was diluted with water to adjust the solid content concentration to 60% by mass and a viscosity of 120 ku, and the above-described base treatment was performed. After applying to a glass fiber reinforced cement board with a trowel at an application amount of 200 g / m ² and drying at room temperature for 1 hour, the same paint was applied onto the glass fiber reinforced cement plate with an iron at an application amount of 200 g / m ² at room temperature. It was dried for 1 hour to obtain an outer wall material having a surface finish of Example 1.

[Comparative Example 1]
The outer wall material of Comparative Example 1 was obtained in the same manner as in Example 1 except that stucco containing 39% by mass of slaked lime, 2% by mass of methylcellulose, and 59% by mass of water was used as a paint.

<Test example>
The outer wall materials of Example 1 and Comparative Example 1 were exposed outdoors at the same place for one year, and changes in the surface were observed. Although no change was observed on the surface of the outer wall material of Example 1, the outer wall material of Comparative Example 1 had cracks on the coating film surface, and a part thereof was peeled off.

According to the surface finishing method of the outer wall material of the present invention, the aesthetic appearance of the building outer wall surface can be maintained over a long period of time, and the construction period can be shortened.

Claims (5)

  Before attaching the outer wall material made of fiber reinforced cement to the outer wall of the building, the surface of the outer wall material made of fiber reinforced cement is treated with a permeable water repellent, and then a paint containing extender pigment, coloring pigment and silicone resin is applied. A method for finishing the surface of an outer wall material, which is applied using a trowel.   In the paint, the extender pigment is 50 to 70% by mass in terms of solid content, the color pigment is 1 to 20% by mass in terms of solid content, and the silicone resin is 8 to 8% in terms of solid content with respect to the total solid content in the paint. The method for finishing an outer wall material surface according to claim 1, wherein the coating material contains 18% by mass.   The method for finishing an outer wall material surface according to claim 1, wherein the permeable water repellent is a polyalkylalkoxysiloxane.   The finishing method of the outer wall material surface according to any one of claims 1 to 3, wherein the outer wall material surface is finished indoors. The finishing method of the outer wall material surface according to any one of claims 1 to 4, wherein the outer wall material surface is finished following the manufacturing process of the fiber reinforced cement outer wall material.