JP2013081941A - Method of forming antifouling coating film, and antifouling painting article - Google Patents

Method of forming antifouling coating film, and antifouling painting article Download PDF

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JP2013081941A
JP2013081941A JP2012216883A JP2012216883A JP2013081941A JP 2013081941 A JP2013081941 A JP 2013081941A JP 2012216883 A JP2012216883 A JP 2012216883A JP 2012216883 A JP2012216883 A JP 2012216883A JP 2013081941 A JP2013081941 A JP 2013081941A
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coating film
forming
antifouling
paint
water
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JP6046436B2 (en
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Kazuo Saito
和夫 齋藤
Keisuke Kairada
圭介 皆良田
Mai Furuta
麻衣 古田
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Dai Nippon Toryo KK
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Abstract

PROBLEM TO BE SOLVED: To provide a method of forming an antifouling coating film that excels in contamination resistance and weatherability that can correspond to a long-term maintenance-free performance, is gentle in environmental point of view because of no use of an organic based solvent, and further includes an overcoat coating film in which an underlayer coating film that is brittle to an organic solvent might not cause the dissolving and the swelling or the like.SOLUTION: The method of forming an antifouling coating film includes: a step in which a coating material for an underlayer coating film is applied on a building base material, and one or more layers of the underlayer coating film are formed; and a step in which a coating composition (A) is applied on the underlayer coating film to form the overcoat coating film whose contact angle to water is 1°-40°. The coating composition (A) includes. as principal ingredients of an overcoat coating material: 0.1-10.0 mass% (on solid content conversion basis) of water dispersion colloidal silica (a); 0.01-1.0 mass% (on solid content conversion basis) of one or more nonionic surfactants (b); and 89-99 mass% of water (c), but does not includes an organic solvent.

Description

本発明は、長期メンテナンスフリーに対応できる耐汚染性、耐候性、耐温水性に優れた、自己洗浄能力を有する防汚層を形成することのできる防汚塗膜の形成方法及び防汚塗装物に関する。   The present invention relates to a method for forming an antifouling coating film capable of forming an antifouling layer having a self-cleaning ability and excellent antifouling resistance, weather resistance, and warm water resistance that can be used for long-term maintenance-free, and an antifouling paint. About.

オルガノポリシロキサン系の無機樹脂を結合剤とする塗膜は、耐候性や耐汚染性等に優れるものの、初期の親水性発現までに時間を要する。また、オルガノシラン及び/又はその部分加水分解縮合物と、シリル基含有化合物を加水分解縮合反応させて得られる有機無機複合樹脂を結合剤とする塗膜は、クラックが生じ難いものの、耐汚染性や、耐候性、耐溶剤性を更に向上させることが求められていた(例えば、特許文献1及び2参照)。   A coating film using an organopolysiloxane-based inorganic resin as a binder is excellent in weather resistance, stain resistance, and the like, but takes time to develop the initial hydrophilicity. In addition, a coating film using an organic-inorganic composite resin obtained by hydrolytic condensation reaction of organosilane and / or its partial hydrolysis-condensation product and a silyl group-containing compound as a binder is resistant to contamination. In addition, it has been required to further improve the weather resistance and solvent resistance (see, for example, Patent Documents 1 and 2).

本願発明者らは、特許文献3に記載されるように、耐汚染性や耐温水性に優れた、自己洗浄能力を有する防汚層を形成する防汚塗膜を見出してきた。防汚塗料の用途拡大により、外装建材向けの30年レベルの耐久性を有する長期メンテナンスフリーに対応できる防汚性・耐候性に優れる塗装システムの必要性が高まってきていた。   As described in Patent Document 3, the present inventors have found an antifouling coating film that forms an antifouling layer having a self-cleaning ability and excellent in stain resistance and hot water resistance. With the expansion of the use of antifouling paints, the need for a coating system with excellent antifouling and weather resistance that can be used for long-term maintenance-free durability for 30 years for exterior building materials has increased.

特開2003−313497号公報JP 2003-31497 A 特開2001−98221号公報JP 2001-98221 A 特許第4641563号明細書Japanese Patent No. 4641563

そこで、本発明の目的は、このような従来技術の課題を背景になされたもので、特定のコロイド状シリカ、特定の界面活性剤、及び水を用いることにより、耐汚染性、耐候性、耐温水性に優れた、自己洗浄能力を有する防汚層を形成し、また、有機系溶剤を使用しないため環境面においても優しく、更に有機溶剤に脆弱な下地塗膜が溶解や膨潤等を起こすことのないオーバーコート塗膜を備えた防汚塗膜の形成方法、並びに該方法によって得られる防汚塗装物を提供することである。   Therefore, the object of the present invention was made against the background of such problems of the prior art. By using a specific colloidal silica, a specific surfactant, and water, contamination resistance, weather resistance, Forms an antifouling layer with excellent hot water and self-cleaning capability, and is environmentally friendly because it does not use organic solvents. In addition, undercoating films that are fragile to organic solvents can cause dissolution and swelling. The present invention provides a method for forming an antifouling coating film provided with an overcoat coating film having no coating, and an antifouling coating product obtained by the method.

また、本発明の別の目的は、建築外装材向けの30年レベルの耐久性を有する長期メンテナンスフリーに対応できる耐汚染性や耐候性に優れる防汚塗膜の形成方法及び防汚塗装物を提供することである。   In addition, another object of the present invention is to provide a method for forming an antifouling coating film and an antifouling paint that is excellent in anti-contamination and weather resistance and can be used for long-term maintenance-free durability for 30 years for building exterior materials. Is to provide.

即ち、本発明の防汚塗膜の形成方法は、
建築基材上に下地塗膜用塗料を塗布し、1層又は複数層の下地塗膜を形成する工程と、
該下地塗膜上に、オーバーコート塗料の主成分として、(a)水分散コロイダルシリカ(固形分換算)0.1〜10.0質量%と、(b)1種類以上のノニオン系界面活性剤(固形分換算)0.01〜1.0質量%と、(c)水89〜99質量%とを含有し、有機系溶剤を含有しない(A)塗料組成物を塗布し、水に対する接触角が1°〜40°であるオーバーコート塗膜を形成する工程と、
を備えることを特徴とする。
That is, the method of forming the antifouling coating film of the present invention is
Applying a base coat paint on a building substrate to form one or more layers of the base coat;
On the undercoating film, as a main component of the overcoat paint, (a) 0.1 to 10.0% by mass of water-dispersed colloidal silica (in terms of solid content) and (b) one or more types of nonionic surfactants (Solid content conversion) 0.01-1.0% by mass, (c) Water 89-99% by mass, no organic solvent (A) A coating composition is applied, and the contact angle to water Forming an overcoat coating film having an angle of 1 ° to 40 °;
It is characterized by providing.

また、本発明の防汚塗装物は、上記の防汚塗膜の形成方法により得られたことを特徴とする。   Moreover, the antifouling paint of the present invention is obtained by the above-described method for forming an antifouling coating film.

本発明によれば、耐汚染性、耐候性、耐温水性に優れた、自己洗浄能力を有する防汚層を形成することが可能となり、30年レベルの耐久性を有する長期メンテナンスフリーに対応できる耐汚染性や耐候性に優れ、また、有機系溶剤を使用しないため環境面においても優しく、更に有機溶剤に脆弱な下地塗膜が溶解や膨潤等を起こすことのないオーバーコート塗膜を備えた防汚塗膜の形成方法、並びに該方法によって得られる防汚塗装物を提供することが可能となった。   According to the present invention, it is possible to form an antifouling layer having a self-cleaning ability, which is excellent in stain resistance, weather resistance, and warm water resistance, and can be used for long-term maintenance-free having a durability of 30 years. Excellent anti-contamination and weather resistance, environmentally friendly because it does not use organic solvents, and has an overcoat coating that does not cause dissolution or swelling of the underlying coating that is fragile to organic solvents. It became possible to provide a method for forming an antifouling coating film and an antifouling coating product obtained by the method.

以下、本発明の実施形態について、詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

本発明の防汚塗膜の形成方法によれば、下地塗膜とオーバーコート塗膜とを備える防汚塗膜を建築基材上に形成できるが、まず、該オーバーコート塗膜を形成するための(A)塗料組成物について説明する。   According to the method for forming an antifouling coating film of the present invention, an antifouling coating film comprising a base coating film and an overcoat coating film can be formed on a building substrate. First, in order to form the overcoat coating film (A) The coating composition will be described.

(A)塗料組成物(以下、オーバーコート塗料ともいう)は、オーバーコート塗料の主成分として、(a)水分散コロイダルシリカ(固形分換算)0.1〜10.0質量%と、(b)1種類以上のノニオン系界面活性剤(固形分換算)0.01〜1.0質量%と、(c)水89〜99質量%とを含有し、有機系溶剤を含有しないことを要する。   (A) The coating composition (hereinafter also referred to as overcoat paint) comprises (a) water-dispersed colloidal silica (in terms of solid content) of 0.1 to 10.0% by mass as the main component of the overcoat paint; 1) One or more types of nonionic surfactant (solid content conversion) 0.01 to 1.0% by mass, and (c) 89 to 99% by mass of water, and no organic solvent is required.

(a)水分散コロイダルシリカについて
(a)成分の水分散コロイダルシリカは、シリカ粒子が、水媒体中に分散したものである。コロイダルシリカは、通常、平均粒子径が、5〜100nmのほぼ球状のシリカ粒子が分散したタイプと、シリカ粒子が太さ5〜50nm、長さ40〜400nm程度に鎖状に凝集して溶液中に分散したタイプと、平均粒子径10〜50nmの球状シリカ粒子がパールネックレス状に50〜400nmの長さに連なったパールネックレス状タイプと、平均粒子径5〜50nmのシリカ粒子が環状に凝集して溶液中に分散した環状タイプ等がある。本発明においては、球状コロイダルシリカを使用することが耐汚染性の観点から好ましい。また、異なるタイプの物も少量であれば混合して使用することができる。水分散コロイダルシリカの球状の平均粒子径は10〜40nmであることが好ましい。平均粒子径が10nm未満であると耐汚染性が低下し、40nmを超えると塗膜外観が低下する傾向がある。
(A) About water-dispersed colloidal silica (a) The water-dispersed colloidal silica of component (a) is a dispersion of silica particles in an aqueous medium. Colloidal silica usually has a type in which approximately spherical silica particles having an average particle diameter of 5 to 100 nm are dispersed, and silica particles aggregate in a chain shape with a thickness of about 5 to 50 nm and a length of about 40 to 400 nm. A pearl necklace type in which spherical silica particles having an average particle diameter of 10 to 50 nm are connected in a pearl necklace shape with a length of 50 to 400 nm and silica particles having an average particle diameter of 5 to 50 nm aggregate in a ring shape. There are ring types dispersed in the solution. In the present invention, it is preferable to use spherical colloidal silica from the viewpoint of stain resistance. Different types of products can also be mixed and used in small amounts. The spherical average particle diameter of the water-dispersed colloidal silica is preferably 10 to 40 nm. When the average particle size is less than 10 nm, the stain resistance decreases, and when it exceeds 40 nm, the appearance of the coating film tends to decrease.

ほぼ球状のシリカ粒子が水に分散したコロイダルシリカは、市販品として容易に入手することができ、具体例としては、例えば、日産化学工業(株)製のスノーテックス−20、スノーテックス−O、スノーテックス−C、スノーテックス−Sや、旭電化工業(株)製のアデライトAT−20、AT−20N、AT−20A、及びAT−300等が挙げられる。   Colloidal silica in which substantially spherical silica particles are dispersed in water can be easily obtained as a commercial product. Specific examples include, for example, SNOWTEX-20, SNOWTEX-O, manufactured by Nissan Chemical Industries, Ltd. SNOWTEX-C, SNOWTEX-S, Adelite AT-20, AT-20N, AT-20A and AT-300 manufactured by Asahi Denka Kogyo Co., Ltd. may be mentioned.

鎖状コロイダルシリカは、水中にシリカ粒子が分散したものであり、市販品として容易に入手することができる。その具体例としては、例えば、日産化学工業(株)製のスノーテックス−UP、及びスノーテックス−OUP(以上、水分散系)等が挙げられる。   Chain colloidal silica is obtained by dispersing silica particles in water, and can be easily obtained as a commercial product. Specific examples thereof include SNOWTEX-UP and SNOWTEX-OUP (above, water dispersion system) manufactured by Nissan Chemical Industries, Ltd.

パールネックレス状コロイダルシリカは、市販品として容易に入手することができ、具体例としては、例えば、日産化学工業(株)製のスノーテックス−PS−S、スノーテックス−PS−M、スノーテックス−PS−SO、及びスノーテックス−PS−MO等が挙げられる。   The pearl necklace-shaped colloidal silica can be easily obtained as a commercial product. Specific examples thereof include, for example, SNOWTEX-PS-S, SNOWTEX-PS-M, SNOWTEX- manufactured by Nissan Chemical Industries, Ltd. PS-SO, Snowtex-PS-MO, etc. are mentioned.

本発明におけるオーバーコート塗料は、水系の塗料組成物であり、塗膜外観が低下するため、水分散コロイダルシリカの分散溶媒として、有機溶媒を含むものは使用できない。   The overcoat paint in the present invention is a water-based paint composition, and the appearance of the coating film is deteriorated. Therefore, a dispersion solvent of water-dispersed colloidal silica cannot contain a solvent containing an organic solvent.

(a)成分は、塗膜の硬化性や耐汚染性を向上させるためのものであり、その配合量は、固形分換算で、オーバーコート塗料((A)塗料組成物)中、0.1〜10.0質量%であり、好ましくは、0.5〜5.0質量%が適当である。(a)成分の配合量が、0.1質量%より少ないと、塗膜の硬化性や、耐汚染性を向上させる効果が発揮されず、逆に10.0質量%を超えると、塗膜の外観が悪くなる傾向にある。   The component (a) is for improving the curability and stain resistance of the coating film, and its blending amount is 0.1 in the overcoat paint ((A) paint composition) in terms of solid content. Is 10.0 mass%, preferably 0.5-5.0 mass%. When the blending amount of the component (a) is less than 0.1% by mass, the effect of improving the curability and stain resistance of the coating film is not exhibited, and conversely when it exceeds 10.0% by mass, the coating film There is a tendency that the appearance of becomes worse.

一般に、水分散コロイダルシリカは、製造方法によりNaを含むが、本発明においてはそのNaを含んだアルカリ性タイプの水分散コロイダルシリカを用いることがシリカ粒子の分散性が向上するため好ましい。よって、(a)成分の水分散コロイダルシリカのpHは、8〜10であることが好ましく、更には、pHが8.5〜9.5であることがより好ましい。   Generally, water-dispersed colloidal silica contains Na depending on the production method. In the present invention, it is preferable to use an alkaline type water-dispersed colloidal silica containing Na, because the dispersibility of silica particles is improved. Therefore, the pH of the water-dispersed colloidal silica of component (a) is preferably 8 to 10, and more preferably 8.5 to 9.5.

(b)ノニオン系界面活性剤について
(A)塗料組成物は、(a)成分の水分散コロイダルシリカの分散性向上や塗膜の耐汚染性、塗膜形成時のフロー性を向上させるために、(b)成分として1種類以上のノニオン系界面活性を含有する。
(B) Nonionic surfactant (A) The coating composition is used to improve the dispersibility of the water-dispersed colloidal silica (a), the stain resistance of the coating film, and the flowability during coating film formation. (B) One or more types of nonionic surface activity are contained as a component.

(b)ノニオン系界面活性剤としては、ポリオキシアルキレンモノアルキルエーテルを含有することが好ましい。これ以外にも、例えば、ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルアリールエーテル、ポリオキシエチレンアルキルフェニルエーテル、プロピレンオキサイド−エチレンオキサイド付加物、ソルビタン脂肪酸エステル、ポリオキシエチレンソルビタン脂肪酸エステル、ポリオキシエチレンソルビトール脂肪酸エステル、グリセリン脂肪酸エステル、ポリオキシエチレン脂肪酸エステル、及びアルキル(ポリ)グリコシド等のノニオン系界面活性剤を用いても構わない。これらの中でもプロピレンオキサイド−エチレンオキサイド付加物を含有すると耐雨筋汚染性が向上するため好ましい。   (B) The nonionic surfactant preferably contains a polyoxyalkylene monoalkyl ether. Other than this, for example, polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene alkyl phenyl ether, propylene oxide-ethylene oxide adduct, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol Nonionic surfactants such as fatty acid esters, glycerin fatty acid esters, polyoxyethylene fatty acid esters, and alkyl (poly) glycosides may be used. Among these, it is preferable to contain a propylene oxide-ethylene oxide adduct because rain-stain stain resistance is improved.

(b)成分の配合量は、固形分換算で、オーバーコート塗料((A)塗料組成物)中0.01〜1.0質量%であり、好ましくは、0.05〜0.5質量%が適当である。(b)成分の配合量が、0.01質量%より少ないと、塗膜の成膜性、外観が悪くなる。逆に1.0質量%より多いと、塗膜の耐水性が低下し、塗膜の耐久性が悪くなる。   The blending amount of the component (b) is 0.01 to 1.0% by mass, preferably 0.05 to 0.5% by mass in the overcoat paint ((A) paint composition) in terms of solid content. Is appropriate. When the blending amount of the component (b) is less than 0.01% by mass, the film formability and appearance of the coating film are deteriorated. On the other hand, when it is more than 1.0% by mass, the water resistance of the coating film is lowered and the durability of the coating film is deteriorated.

(c)成分について
希釈剤としての(c)成分の水は、純水、蒸留水、イオン交換水、又は水道水等を使用することができる。
About (c) component Pure water, distilled water, ion-exchange water, or tap water etc. can be used for the water of (c) component as a diluent.

(c)水の配合量は、オーバーコート塗料((A)塗料組成物)中、89〜99質量%であり、更に好ましくは、95〜99質量%である。(c)成分の配合量が、89質量%より少ないと、塗料粘度が高くなり塗装作業性が悪くなり、逆に99質量%を超えると、防汚塗料成分が希薄となり、均一な塗膜が得られなくなる。   (C) The compounding quantity of water is 89-99 mass% in an overcoat coating material ((A) coating composition), More preferably, it is 95-99 mass%. When the blending amount of the component (c) is less than 89% by mass, the paint viscosity becomes high and the coating workability is deteriorated. Conversely, when it exceeds 99% by mass, the antifouling paint component becomes dilute and a uniform coating film is formed. It can no longer be obtained.

本発明におけるオーバーコート塗料は、更にフッ素系界面活性剤を含有することが好ましい。ここで言うフッ素系界面活性剤は、分子内にCF(CF−で構成されるパーフルオロアルキル基や、対応するパーフルオロアルケニル基を含有する界面活性剤であることが好ましい。上記フッ素系界面活性剤を添加することで、表面張力を更に低下させることができ、塗膜の親水性が向上し塗膜の耐汚染性も向上させることができる。 The overcoat paint in the present invention preferably further contains a fluorosurfactant. The fluorosurfactant here is preferably a surfactant containing a perfluoroalkyl group composed of CF 3 (CF 2 ) n — or a corresponding perfluoroalkenyl group in the molecule. By adding the fluorosurfactant, the surface tension can be further reduced, the hydrophilicity of the coating film can be improved, and the stain resistance of the coating film can be improved.

このようなフッ素系界面活性剤としては、例えば、パーフルオロアルキルカルボン酸塩、パーフルオロアルキルスルホン酸塩、パーフルオロアルキルリン酸エステル、パーフルオロアルケニルスルホン酸塩、パーフルオロアルケニルカルボン酸塩等のアニオン型フッ素系界面活性剤;パーフルオロアルキルベタイン等の両性型フッ素系界面活性剤;パーフルオロアルキルトリメチルアンモニウム等のカチオン型フッ素系界面活性剤;パーフルオロアルキルエチレンオキシド付加物、パーフルオロアルキルアミンオキサイド、パーフルオロアルキル基を含有するオリゴマー等のノニオン型フッ素系界面活性剤が挙げられる。これらの中でもパーフルオロアルケニル基を有するフッ素系界面活性剤が、特に塗膜の耐汚染性に優れるため好ましい。   Examples of such a fluorosurfactant include anions such as perfluoroalkyl carboxylate, perfluoroalkyl sulfonate, perfluoroalkyl phosphate, perfluoroalkenyl sulfonate, and perfluoroalkenyl carboxylate. Type fluorosurfactant; amphoteric type fluorosurfactant such as perfluoroalkylbetaine; cationic type fluorosurfactant such as perfluoroalkyltrimethylammonium; perfluoroalkylethylene oxide adduct, perfluoroalkylamine oxide, perfluoroalkyl surfactant Nonionic fluorine-type surfactants, such as an oligomer containing a fluoroalkyl group, are mentioned. Among these, a fluorosurfactant having a perfluoroalkenyl group is particularly preferable because of excellent stain resistance of the coating film.

本発明におけるオーバーコート塗料は、更に無機酸化物粒子を含有することが好ましい。ここでいう無機酸化物粒子は、光触媒機能を有しない無機酸化物(M)を主成分とする微粒子であり、その態様は粉末やゾル等の分散体のタイプであっても構わない。無機酸化物粒子を添加することで、更に塗膜の耐汚染性が向上するため好ましい。塗料中へは固形分で、0.01〜1質量%添加するのが好ましい。 The overcoat paint in the present invention preferably further contains inorganic oxide particles. The inorganic oxide particles herein are fine particles mainly composed of inorganic oxide (M n O m ) having no photocatalytic function, and the mode may be a dispersion type such as powder or sol. . It is preferable to add inorganic oxide particles because the stain resistance of the coating film is further improved. It is preferable to add 0.01 to 1% by mass as a solid content in the paint.

このような無機酸化物粒子を形成する化合物としては、酸化アルミニウム、酸化チタン、酸化鉄、酸化コバルト、酸化ニッケル、酸化銅、酸化亜鉛、酸化ジルコニウム、酸化インジウム、酸化錫、酸化アンチモン、酸化セリウム、酸化ビスマス、酸化インジウム錫、酸化アンチモン錫などが挙げられる。これらの中には、光触媒活性を有するものも含まれているが、これら無機酸化物粒子は、有機物または無機物により表面処理され、不活性化したものが好ましい。また、これらの中でも、酸化錫や酸化亜鉛は、特に塗膜の耐汚染性向上に優れるため好ましい。   Examples of the compound that forms such inorganic oxide particles include aluminum oxide, titanium oxide, iron oxide, cobalt oxide, nickel oxide, copper oxide, zinc oxide, zirconium oxide, indium oxide, tin oxide, antimony oxide, cerium oxide, Examples thereof include bismuth oxide, indium tin oxide, and antimony tin oxide. Among these, those having photocatalytic activity are included, but these inorganic oxide particles are preferably surface-treated with an organic or inorganic substance and inactivated. Among these, tin oxide and zinc oxide are preferable because they are particularly excellent in improving the stain resistance of the coating film.

本発明におけるオーバーコート塗料は、高分子重合体(樹脂)成分を含有しないことが好ましい。高分子重合体(樹脂)成分を含むと、オーバーコート塗料を塗布後、硬化・乾燥の工程に時間を要するため、塗装した基材同士を積み重ねる際のブロッキング(塗膜の付着)が起こり易くなるためである。ここで言う高分子重合体とは、被膜形成成分としてのバインダー樹脂成分であり、その態様は水中に分散する成分でも水溶性成分であって構わない。   The overcoat paint in the present invention preferably contains no polymer (resin) component. When a polymer (resin) component is included, it takes time for the curing / drying process after applying the overcoat paint, so blocking (coating adhesion) tends to occur when the coated substrates are stacked. Because. The high molecular polymer referred to here is a binder resin component as a film forming component, and the mode thereof may be either a component dispersed in water or a water-soluble component.

そのような高分子重合体成分としては、例えば、アクリルエマルション、エポキシエマルション、ポリエステルエマルション、ポリウレタンエマルション、シリコン系エマルション、及びフッ素樹脂エマルション等の水分散性樹脂、水溶性アクリル、水溶性ポリエステル、水溶性ポリウレタン、水溶性アクリルシリコーン、及び水溶性フッ素樹脂等の水溶性樹脂が挙げられ、これらには変性されているものも含む。   Examples of such a polymer component include water-dispersible resins such as acrylic emulsion, epoxy emulsion, polyester emulsion, polyurethane emulsion, silicone emulsion, and fluororesin emulsion, water-soluble acrylic, water-soluble polyester, water-soluble Examples include water-soluble resins such as polyurethane, water-soluble acrylic silicone, and water-soluble fluororesin, including those that have been modified.

また、本発明におけるオーバーコート塗料は、光触媒機能材料を含有しないことが好ましい。光触媒機能材料を保持できるバインダー成分を含有しないことで、オーバーコート塗料組成物中の界面活性剤成分等が光触媒機能により分解され、塗膜の外観が悪くなる恐れがなくなる。ここで言う光触媒機能材料とは、紫外線や可視光等を照射すると電子及び正孔が生じ、この電子が空気中の酸素を還元することで活性酸素や水酸基ラジカルを発生し、それによる有機物の分解や消臭効果、抗菌・防カビ効果、塗膜表面の親水性付与(防汚機能)や帯電防止効果等を有する材料のことである。   Moreover, it is preferable that the overcoat paint in this invention does not contain a photocatalyst functional material. By not containing a binder component that can hold the photocatalytic functional material, the surfactant component in the overcoat coating composition is decomposed by the photocatalytic function, and the appearance of the coating film is not deteriorated. The photocatalytic functional material mentioned here generates electrons and holes when irradiated with ultraviolet rays, visible light, etc., and these electrons reduce oxygen in the air to generate active oxygen and hydroxyl radicals, thereby decomposing organic substances. It is a material having a deodorizing effect, an antibacterial / antifungal effect, imparting hydrophilicity to the coating film surface (antifouling function), an antistatic effect, and the like.

なお、光触媒機能は、その物質特有の表面特性であることから、その機能発現のため有機物や無機物によって表面処理されていない物質を指す。光触媒機能を有する材料としては、主に酸化チタンがあり、それ以外に、チタン酸ストロンチウム、酸化亜鉛、酸化スズ、酸化タングステン、酸化ジルコニウム、酸化ニオブ、酸化ニッケル及び酸化ビスマス等の酸化物半導体が挙げられる。   In addition, since the photocatalytic function is a surface characteristic peculiar to the substance, it refers to a substance that is not surface-treated with an organic substance or an inorganic substance for the function expression. As a material having a photocatalytic function, there is mainly titanium oxide. In addition, oxide semiconductors such as strontium titanate, zinc oxide, tin oxide, tungsten oxide, zirconium oxide, niobium oxide, nickel oxide, and bismuth oxide are listed. It is done.

本発明におけるオーバーコート塗料は、例えば、メタノール、エタノール、プロパノール、ブタノール、トルエン及びキシレン等の有機系溶剤を含有しないことを特徴の一つとする。有機系溶剤を含んでいると、塗膜の成膜性が低下し、塗膜の外観等が悪くなる。また、有機系溶剤を含んでいると、下地塗膜の溶解や膨潤等により下地に悪影響を与える場合があり、特に有機塗膜上に塗装する場合は注意を要する。これに対して、本発明におけるオーバーコート塗料は有機系溶剤を含まないため、そのような課題は生じない。更に、揮発性の有機溶剤を含まないため、被塗物に付着しなかった塗料(オーバースプレー)も回収し再利用することが可能であり、環境に対して非常に優しい塗料である。   One feature of the overcoat paint in the present invention is that it does not contain an organic solvent such as methanol, ethanol, propanol, butanol, toluene and xylene. When the organic solvent is contained, the film formability of the coating film is lowered and the appearance of the coating film is deteriorated. In addition, if an organic solvent is contained, the base may be adversely affected by dissolution or swelling of the base coat, and care must be taken especially when coating on the organic coat. On the other hand, since the overcoat paint in the present invention does not contain an organic solvent, such a problem does not occur. Furthermore, since it does not contain a volatile organic solvent, it is possible to collect and reuse paint that has not adhered to the object to be coated (overspray), and is very environmentally friendly.

本発明におけるオーバーコート塗料は、表面張力が、40dyn/cm(25℃)以下であることが好ましく、更には、30dyn/cm(25℃)以下であることがより好ましい。表面張力が、40dyn/cm(25℃)よりも大きいと均一な塗膜形成が困難となるため、十分な塗膜性能が発揮できない。   The overcoat paint in the present invention preferably has a surface tension of 40 dyn / cm (25 ° C.) or less, and more preferably 30 dyn / cm (25 ° C.) or less. When the surface tension is greater than 40 dyn / cm (25 ° C.), it is difficult to form a uniform coating film, and thus sufficient coating performance cannot be exhibited.

本発明におけるオーバーコート塗料は、150℃、30分間の加熱残分が、0.1〜10.0質量%であることが好ましく、更には、0.5〜5.0質量%であることがより好ましい。加熱残分が、0.1質量%未満であると、塗膜の硬化性や、耐汚染性を向上させる効果が少なく、10.0質量%超過であると塗膜の外観が悪くなる傾向がある。   In the overcoat paint of the present invention, the heating residue at 150 ° C. for 30 minutes is preferably 0.1 to 10.0% by mass, and more preferably 0.5 to 5.0% by mass. More preferred. If the heating residue is less than 0.1% by mass, the effect of improving the curability and stain resistance of the coating film is small, and if it exceeds 10.0% by mass, the appearance of the coating film tends to deteriorate. is there.

本発明におけるオーバーコート塗料は、塗膜形成時に(a)成分の水分散コロイダルシリカが塗膜表面に偏析し、コロイダルシリカが互いにネットワーク構造を形成する。これにより、膜厚が薄くても強固な塗膜を形成するため、優れた耐汚染性、耐水性を発現することが可能となり、雨水により(a)成分の水分散コロイダルシリカが洗い流されることがなく、耐汚染機能の維持性にも優れると考えられる。しかしながら、オーバーコート塗料((A)塗料組成物)中に有機系溶剤を含んでいると、そのコロイダルシリカのネットワーク構造が形成されず、雨水により(a)成分の水分散コロイダルシリカが洗い流され易く良好な塗膜が形成されないと考えられる。   In the overcoat paint according to the present invention, the water-dispersed colloidal silica of component (a) is segregated on the surface of the coating film during the formation of the coating film, and the colloidal silica forms a network structure with each other. Thereby, since a strong coating film is formed even if the film thickness is thin, it becomes possible to express excellent stain resistance and water resistance, and the water-dispersed colloidal silica of component (a) can be washed away by rainwater. It is also considered that the anti-contamination function is excellent in maintenance. However, when an organic solvent is included in the overcoat paint ((A) paint composition), the network structure of the colloidal silica is not formed, and the water-dispersed colloidal silica of the component (a) is easily washed away by rainwater. It is thought that a good coating film is not formed.

本発明におけるオーバーコート塗料は、以上説明した(a)成分、(b)成分及び(c)成分の3成分を主成分とし、有機系溶剤を含有しない。更に、必要に応じて、塗膜物性の向上や着色等のために、充填剤や、染料、硬化剤、更には、硬化促進剤、増粘剤、及び顔料分散剤等の各種添加剤等を配合することができる。   The overcoat paint in the present invention contains the above-described three components (a), (b) and (c) as main components and does not contain an organic solvent. Furthermore, if necessary, for the purpose of improving coating properties and coloring, fillers, dyes, curing agents, and further various additives such as curing accelerators, thickeners, and pigment dispersants. Can be blended.

充填剤としては、例えば、タルクや、硫酸バリウム、炭酸カルシウム、炭酸バリウム、ベントナイト、酸化チタン(光触媒機能を有さない顔料)、カーボンブラック、及びベンガラ、リトポン等の各種塗料用体質顔料や、着色顔料が使用可能である。   Examples of the filler include talc, barium sulfate, calcium carbonate, barium carbonate, bentonite, titanium oxide (pigment not having a photocatalytic function), carbon black, and various extender pigments for paints such as Bengala and lithopone, and coloring. Pigments can be used.

次に、オーバーコート塗料((A)塗料組成物)が塗装される建築基材や下地塗膜について説明する。本発明に使用される建築基材は、主に建材、特に建築外装材に使用されるものに適用され、例えば、フレキシブルボードや、珪酸カルシウム板、石膏スラグバーライト板、木片セメント板、石綿セメント板、パルプセメント板、プレキャストコンクリート板、軽量気泡コンクリート板(ALC板)、及び石膏ボード等の無機建材や、アルミニウム、鉄及びステンレス等の金属建材等が代表的なものとして挙げられる。これらはその表面が平滑なものであっても、凹凸形状を有するものであってもよい。   Next, the construction substrate and the base coating film on which the overcoat paint ((A) paint composition) is applied will be described. The building base material used in the present invention is mainly applied to building materials, particularly those used for building exterior materials, such as flexible boards, calcium silicate boards, gypsum slag bar light boards, wood chip cement boards, asbestos cements. Representative examples include inorganic building materials such as plates, pulp cement plates, precast concrete plates, lightweight cellular concrete plates (ALC plates), and gypsum boards, and metal building materials such as aluminum, iron, and stainless steel. These may have a smooth surface or may have an uneven shape.

建築基材上に下地塗膜が形成される場合、下地塗膜は、1層又は複数層の塗膜からなる。ここで、下地塗膜が、複数層の塗膜からなる場合、例えば、次のような構造が挙げられる。建築基材上に、下塗り塗料及び上塗り塗料を順に塗装してなる2層構造の下地塗膜や、建築基材上に、下塗り塗料、中塗り塗料、及び上塗り塗料を順に塗装してなる3層構造の下地塗膜が挙げられる。なお、下地塗膜を形成する塗料(下地塗膜用塗料)としては、基材と塗膜との長期間密着性を発現させる働きをなすものであり、ビニル樹脂、アクリルスチレン樹脂、エポキシ/ポリアミン樹脂又はウレタン樹脂等を結合剤とする各種の溶剤系又は水系塗料等が挙げられ、塗膜機能としては基材密着性や耐アルカリ性、耐エフロレッセンス性等が要求される。   When a base coating film is formed on a building substrate, the base coating film is composed of a single layer or a plurality of layers. Here, when a base coating film consists of a several layer coating film, the following structures are mentioned, for example. A two-layer undercoat that is formed by coating an undercoating paint and an overcoating paint in order on a building substrate, and a three-layer that is formed by sequentially applying an undercoating paint, an intermediate coating, and an overcoating paint on a building substrate. An undercoat film having a structure may be mentioned. In addition, as a coating material (coating material for the base coating film) that forms the base coating film, it has a function of developing long-term adhesion between the substrate and the coating film, such as vinyl resin, acrylic styrene resin, epoxy / polyamine. Examples include various solvent-based or water-based paints using a resin or urethane resin as a binder, and the coating film functions require adhesion to the substrate, alkali resistance, efflorescence resistance, and the like.

特に外壁等の塗膜に耐候性や耐凍害性等が要求される建築建材の場合には、アクリル樹脂、アクリルウレタン樹脂、ウレタン樹脂、フッ素樹脂又は有機無機複合系樹脂等を結合剤とする溶剤系又は水系塗料が塗装される。   In particular, in the case of building materials that require weather resistance, frost damage resistance, etc. on coatings on outer walls, etc., solvents that use acrylic resin, acrylic urethane resin, urethane resin, fluorine resin, or organic-inorganic composite resin as a binder Or water-based paint is applied.

本発明において、下地塗膜を形成する塗料としては、形成される下地塗膜の水に対する接触角が120°以下になるものを適用することが好ましい。そのような下地塗膜を形成する塗料(下地塗膜が複数層の塗膜である場合、下地塗膜の最上層を形成する上塗り塗料)としては、結合剤として無機系樹脂、特にSi−OR基(Rは水素原子又は炭素数1〜12の炭化水素基)を有する化合物を含有するものが好ましく、その含有量は、塗膜形成成分換算で0.1〜50質量%であることが好ましい。これにより、オーバーコート塗料から形成されるオーバーコート塗膜との密着がより優れ、本発明が目的とする30年レベルの耐久性を有する長期メンテナンスフリーをより確実に達成できるため好ましい。   In the present invention, it is preferable to apply a paint having a contact angle to water of 120 ° or less as the paint for forming the base coating film. As a paint for forming such a base coat (when the base coat is a multi-layer coat, a top coat that forms the uppermost layer of the base coat), an inorganic resin as a binder, particularly Si-OR. What contains the compound which has group (R is a hydrogen atom or a C1-C12 hydrocarbon group) is preferable, and it is preferable that the content is 0.1-50 mass% in conversion of a coating-film formation component. . This is preferable because the adhesion with the overcoat coating film formed from the overcoat paint is more excellent, and the long-term maintenance-free having the durability of 30 years, which is the purpose of the present invention, can be achieved more reliably.

Si−OR基(Rは水素原子又は炭素数1〜12の炭化水素基)を有する化合物を含有する塗料としては、加水分解性シリル基含有ビニル系塗料や、オルガノポリシロキサン系塗料、及びシランカップリング剤添加塗料等が挙げられる。   Examples of paints containing compounds having Si-OR groups (R is a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms) include hydrolyzable silyl group-containing vinyl paints, organopolysiloxane paints, and silane cups. Examples thereof include a ring agent-added paint.

本発明において、下地塗膜を形成する塗料には、各種機能を付与させるために、防カビ剤、防腐剤、紫外線吸収剤、光安定剤、更に体質顔料や、着色顔料、防錆顔料、着色骨材等の骨材を配合できる他、分散剤や沈降防止剤、増粘剤等の各種添加剤をも配合することができる。   In the present invention, in order to impart various functions to the paint for forming the base coating film, an antifungal agent, an antiseptic, an ultraviolet absorber, a light stabilizer, an extender pigment, a coloring pigment, an antirust pigment, a coloring agent In addition to the aggregate such as aggregate, various additives such as a dispersant, an anti-settling agent, and a thickener can also be blended.

本発明におけるオーバーコート塗料は、建築基材上に1つ又は複数種の塗料を塗布し、硬化・乾燥させ、1層又は複数層の下地塗膜を形成した後に、該下地塗膜の上から塗装し、硬化・乾燥させてオーバーコート塗膜を形成する。形成されたオーバーコート塗膜上の水に対する接触角は、1°〜40°であり、好ましくは5°〜30°である。接触角が40°より大きいと塗膜の防汚性能が低下する。   The overcoat paint in the present invention is applied to one or more kinds of paint on a building substrate, cured and dried to form one or more undercoat films, and then from above the undercoat film. Paint, cure and dry to form an overcoat film. The contact angle with respect to water on the formed overcoat coating film is 1 ° to 40 °, preferably 5 ° to 30 °. When the contact angle is larger than 40 °, the antifouling performance of the coating film is lowered.

本発明において、下地塗膜を形成する塗料(下地塗膜が複数層の塗膜である場合、下地塗膜の最上層を形成する上塗り塗料)は、艶消し剤、又は着色ビーズ、着色骨材等の骨材を含有し、艶消し塗膜、又は高意匠性塗膜を形成することが、塗膜外観及び意匠性の付与のために好ましい。なお、高意匠性塗膜とは、塗膜の最上層を形成する上塗り塗膜(一般的にクリヤー塗膜)に着色ビーズ、着色骨材などを添加することで、高度な意匠性を付与した塗膜を指す。艶消し剤としては、例えば、シリカ系艶消し剤、樹脂ビーズ、ガラスビーズ及びタルク等の体質顔料等が挙げられる。また、着色ビーズ、着色骨材等の骨材としては、例えば、着色樹脂ビーズ、着色ガラスビーズ、マイカ、カラーマイカ、珪砂、カラーサンド等が挙げられる。   In the present invention, the paint for forming the base coat (when the base coat is a multi-layer coat, the top coat for forming the uppermost layer of the base coat) is a matting agent, colored beads, or colored aggregate. In order to impart a coating film appearance and a design property, it is preferable to contain an aggregate such as a mat and to form a matte coating film or a highly designed coating film. In addition, a highly designable coating film imparts a high degree of design by adding colored beads, colored aggregates, etc. to the top coating film (generally a clear coating film) that forms the uppermost layer of the coating film. Refers to the coating film. Examples of the matting agent include silica-based matting agents, extender pigments such as resin beads, glass beads, and talc. Examples of aggregates such as colored beads and colored aggregates include colored resin beads, colored glass beads, mica, colored mica, silica sand, and colored sand.

下地塗膜用塗料やオーバーコート塗料の塗装方法としては、例えば、刷毛、スプレー、ロール及びディッピング等の塗装手段によって、これら塗料を基材上に塗装し、例えば、常温もしくは300℃以下の温度で焼付けることにより、硬化塗膜を形成する方法が挙げられる。場合により、予め基材を加熱しておき(プレヒート)、その上から塗料を塗装し、硬化塗膜を形成することもできる。なお、本発明においては、建築基材上に防汚塗膜が形成された塗装物を防汚塗装物と称する。   As a method for applying the paint for overcoat or overcoat paint, for example, these paints are applied onto a substrate by a coating means such as brush, spray, roll and dipping, for example, at room temperature or at a temperature of 300 ° C. or lower. The method of forming a cured coating film by baking is mentioned. In some cases, the base material may be heated in advance (preheating), and a paint may be applied thereon to form a cured coating film. In addition, in this invention, the coating material in which the antifouling coating film was formed on the building base material is called antifouling coating material.

下地塗膜の膜厚は、数μm〜数百μmであり、特に制限されない。オーバーコート塗料により形成されるオーバーコート塗膜の膜厚は、0.1〜2μmであることが好ましい。   The film thickness of the base coating film is from several μm to several hundred μm, and is not particularly limited. The film thickness of the overcoat coating film formed by the overcoat paint is preferably 0.1 to 2 μm.

以下、本発明について、実施例により更に詳細に説明する。なお、実施例中の「部」や「%」は、特に断らない限り、質量基準で示す。なお、表1及び表2に記載される処方は、質量部で表示されている。   Hereinafter, the present invention will be described in more detail with reference to examples. In the examples, “parts” and “%” are based on mass unless otherwise specified. In addition, the prescription described in Table 1 and Table 2 is displayed by the mass part.

(i)オーバーコート塗料組成物の調製
<実施例1〜12及び比較例1〜5>
表1〜表2に示すように各成分を配合し、実施例1〜12及び比較例1〜5のオーバーコート塗料組成物を得た。得られた各オーバーコート塗料組成物について、水に対する接触角、表面張力や加熱残分の測定を、以下のように行った。
(I) Preparation of overcoat paint composition <Examples 1 to 12 and Comparative Examples 1 to 5>
Each component was mix | blended as shown in Table 1-Table 2, and the overcoat coating material composition of Examples 1-12 and Comparative Examples 1-5 was obtained. About each obtained overcoat coating composition, the contact angle with respect to water, surface tension, and the measurement of a heating residue were measured as follows.

<水に対する静的接触角の測定>
塗板表面に0.1ccの蒸留水を滴下し、20℃の雰囲気下で滴下1分後の接触角を協和界面化学株式会社CA−X接触角測定装置にて測定した。
<Measurement of static contact angle with water>
0.1 cc of distilled water was dropped on the surface of the coated plate, and the contact angle after 1 minute of dropping was measured at 20 ° C. with a Kyowa Interface Chemical Co., Ltd. CA-X contact angle measuring device.

<表面張力の測定方法>
表面張力の測定は、協和界面科学(株)製の表面張力計(CBVP−A3型)を用いて、25℃で測定した。
<Method for measuring surface tension>
The surface tension was measured at 25 ° C. using a surface tension meter (CBVP-A3 type) manufactured by Kyowa Interface Science Co., Ltd.

<加熱残分の測定方法>
加熱残分は、試料約3グラムをアルミニウムカップに精秤し、150℃オーブンを用いて30分間乾燥後の質量を精秤し、元の質量に対する残分の質量から計算し、加熱残分(%)を求めた。
<Measurement method of heating residue>
The heating residue is precisely weighed about 3 grams of the sample in an aluminum cup, weighed after drying for 30 minutes using a 150 ° C. oven, calculated from the weight of the residue with respect to the original mass, and the heating residue ( %).

各防汚塗料組成物の塗膜性能評価は、以下のように行った。
<性能評価試験>
(ii)防汚塗料組成物の塗膜性能評価用試験板の作製
基材として石膏スラグパーライト板(厚さ12mm)を用い、その表面にポリイソシアネートプレポリマー溶液シーラー「Vセラン#100シーラー」(大日本塗料(株)製、酢酸ブチル:キシレン=1:1の溶剤で100%希釈)を塗着量が90〜100g/m(wet質量)となるように吹付塗装した。これを100℃で5分間乾燥した。次いで上塗り塗料としてアクリルシリコーン樹脂系塗料「Vセラン#500エナメル」(大日本塗料(株)製、酢酸ブチル:キシレン=1:1の溶剤で40%希釈)を塗着量が80〜90g/m(wet質量)となるように吹付塗装した。これを120℃で15分間乾燥した。得られた上塗り塗膜の水に対する接触角は60°(20℃)、またその塗膜中のSi−OR基の含有量は1.5質量%であった。
The coating film performance evaluation of each antifouling paint composition was performed as follows.
<Performance evaluation test>
(Ii) Preparation of test plate for evaluating coating film performance of antifouling paint composition A gypsum slag perlite plate (thickness 12 mm) was used as a base material, and a polyisocyanate prepolymer solution sealer "V-Selan # 100 sealer" Dainippon Paint Co., Ltd., 100% diluted with a solvent of butyl acetate: xylene = 1: 1) was spray-coated so that the coating amount was 90 to 100 g / m 2 (wet mass). This was dried at 100 ° C. for 5 minutes. Next, an acrylic silicone resin-based paint “V-Selan # 500 Enamel” (Dainippon Paint Co., Ltd., diluted 40% with a solvent of butyl acetate: xylene = 1: 1) as a top coat is applied in an amount of 80 to 90 g / m. 2 (wet mass) was spray-painted. This was dried at 120 ° C. for 15 minutes. The contact angle with respect to the water of the obtained top coat film was 60 ° (20 ° C.), and the content of Si—OR groups in the coating film was 1.5% by mass.

次いで、前述の各調製した溶液に界面活性剤や希釈剤等を添加し、表1〜表2に示す配合のオーバーコート塗料を、塗着量70〜80g/m(wet質量)となるように吹付塗装した。これを120℃で15分間乾燥した後、室温で3日間乾燥し、得られた塗膜の外観、耐温水性、耐汚染性、耐候性、耐凍害性及び接触角の各性能評価試験を行い、その結果を表1〜表2に示した。 Subsequently, a surfactant, a diluent, or the like is added to each of the prepared solutions so that the overcoat paint having the composition shown in Tables 1 and 2 has a coating amount of 70 to 80 g / m 2 (wet mass). Spray painted. After drying this at 120 ° C. for 15 minutes, it is dried at room temperature for 3 days, and each performance evaluation test of appearance, warm water resistance, stain resistance, weather resistance, frost damage resistance and contact angle of the obtained coating film is performed. The results are shown in Tables 1 and 2.

なお、各性能評価試験の試験方法及び評価基準は、以下に基づいて行った。   In addition, the test method and evaluation criteria of each performance evaluation test were performed based on the following.

<塗膜外観>
得られた塗膜の外観を、以下のように目視で評価した。
◎・・・良好(透明な膜)
○・・・やや良好(一部白濁)
△・・・不良(全体的にやや白濁)
×・・・不良(全体的に白濁)
<Appearance of coating film>
The appearance of the obtained coating film was visually evaluated as follows.
◎ ・ ・ ・ Good (transparent film)
○: Slightly good (partly cloudy)
Δ: Poor (slightly cloudy overall)
× ... Defective (overall cloudy)

<耐温水性>
上記のように作製した塗板を80℃の温水中に3時間浸漬した後の塗膜外観を、浸漬中及び塗膜乾燥後において、以下のように目視判定した。
◎・・・浸漬中及び塗膜乾燥後、共に変化無し
○・・・浸漬中軽微な白化は有るが、塗膜乾燥後では変化無し
△・・・浸漬中での白化が酷く、塗膜乾燥後では光沢低下、白化等の軽微な変化有り
×・・・浸漬中での白化が酷く、塗膜乾燥後では光沢低下、白化等の変化大
<Hot water resistance>
The appearance of the coating film after the coated plate produced as described above was immersed in warm water at 80 ° C. for 3 hours was visually judged as follows during the immersion and after the coating film was dried.
◎ ・ ・ ・ No change during soaking and after drying the coating ○ ・ ・ ・ Slight whitening during soaking, but no change after drying the coating △ ・ ・ ・ Severe whitening during soaking After that, there are minor changes such as gloss reduction and whitening. × ・ ・ ・ Whitening during immersion is severe, and after drying the film, changes such as gloss reduction and whitening are large.

<耐汚染性>
塗板上にカーボンブラック分散液(ターペン溶液)をスポイトで数滴滴下して流し塗りした後、水の霧吹きでそれを洗い流し、その除染性を以下のように目視判定した。
◎・・・完全除去
○・・・極く軽微な汚染
△・・・少し汚染
×・・・汚染著しい
<Contamination resistance>
A few drops of a carbon black dispersion (terpene solution) was dropped onto the coated plate with a dropper, and then washed off with a spray of water. The decontamination property was visually determined as follows.
◎ ・ ・ ・ Complete removal ○ ・ ・ ・ Minimum contamination △ ・ ・ ・ Slight contamination × ・ ・ ・ Significant contamination

<耐雨筋汚染性>
水平面に対して10度に傾斜し、かつ、長さ30cmで深さ3mmの溝が3mmピッチで刻まれた屋根を有する架台上に、上記の各塗板を、降雨が塗膜表面に筋状に流れ落ちるように南向きに垂直に取り付け、その状態で12ヶ月間暴露した後、塗膜外観を試験前の塗膜と比較し、塗膜表面の汚染状態を、以下のように目視判定した。
◎・・・汚れは無く、雨筋も確認されない
○・・・わずかな汚れは有るが、雨筋は確認されない
△・・・局所的な汚れが有り、雨筋が薄く確認される
×・・・全面にかなりの汚れが有り、雨筋がはっきりと確認される
<Rain-stain stain resistance>
The above-mentioned coated plates are streaked on the surface of the coating film on a frame having a roof inclined at 10 degrees with respect to the horizontal plane and having a groove with a length of 30 cm and a depth of 3 mm carved at a pitch of 3 mm. After mounting vertically and facing southward for 12 months, the appearance of the coating film was compared with the coating film before the test, and the contamination state of the coating film surface was visually determined as follows.
◎ ・ ・ ・ There is no dirt and no rain streak is confirmed ○ ・ ・ ・ Slight dirt is present but no rain streak is confirmed △ ・ ・ ・ There is local dirt and the rain streak is confirmed thin × ・ ・・ There is considerable dirt on the entire surface, and rain lines are clearly confirmed.

<耐候性>
サンシャインウェザー−オーメーターにより5000時間行い、その耐候性を以下のように判定した。
○・・・塗膜外観に変化は無く、光沢保持率95%以上
△・・・塗膜外観の変化が軽微にあり、光沢保持率80%以上95%未満
×・・・塗膜外観の変化が著しく、光沢保持率80%未満
<Weather resistance>
The weather resistance was determined as follows using a sunshine weather-ometer for 5000 hours.
○ ・ ・ ・ No change in coating film appearance, gloss retention of 95% or more △ ・ ・ ・ Minor change in coating film appearance, gloss retention of 80% or more and less than 95% × ・ ・ ・ Change in coating film appearance Remarkably, gloss retention less than 80%

<耐凍害性>
ASTM−C666A法(凍結−融解サイクル)により、100サイクルの耐凍害性を実施し、以下のように目視判定した。
○・・・塗膜にクラックの発生無し
△・・・極く軽微なクラックの発生有り
×・・・クラックの発生又は塗膜の部分剥離
<Frost resistance>
By the ASTM-C666A method (freezing-thawing cycle), 100 cycles of frost damage resistance were carried out and visually judged as follows.
○ ・ ・ ・ No cracks in the coating film △ ・ ・ ・ There is very slight cracking × ・ ・ ・ Occurrence of cracks or partial peeling of the coating film

Figure 2013081941
Figure 2013081941

Figure 2013081941
Figure 2013081941

1)水分散コロイダルシリカA(日産化学工業(株)製、スノーテックス−O、固形分20%、pH3.8、平均粒子径10〜20nm、形状:球状、酸性タイプ)
2)水分散コロイダルシリカB(日産化学工業(株)製、スノーテックス−C、固形分20%、pH9.0、平均粒子径10〜20nm、形状:球状)
3)水分散コロイダルシリカC(日産化学工業(株)製、スノーテックス−PS−SO、固形分20%、pH3.0、平均粒子径80〜120nm、形状:パールネックレス状)
4)水分散コロイダルシリカD(日産化学工業(株)製、スノーテックス−UP、固形分20%、pH10.0、平均粒子径40〜100nm、形状:鎖状)
5)イソプロパノール分散コロイダルシリカE(日産化学工業(株)製、IPA−ST、固形分30%、pH3.2、平均粒子径10〜20nm、形状:球状)
6)酸化錫粒子(N.T.S.社製、光触媒機能を有さない酸化スズゾル、固形分20%)
7)酸化亜鉛粒子(BYK社製、光触媒を有さない酸化亜鉛ゾル、固形分45%)
8)光触媒酸化チタン粒子(石原産業(株)製、光触媒TiO、平均粒径8μm)
9)ノニオン系界面活性剤A(TEGO社製、ポリフローKL−510、固形分100%、成分:ポリオキシアルキレンモノアルキルエーテル)
10)ノニオン系界面活性剤B(サンノプコ(株)製、SN984、固形分100%、成分:ポリエーテル系化合物)
11)ノニオン系界面活性剤C(第一工業製薬(株)、ニューコール1004、固形分100%、成分:ポリオキシエチレン−2−エチルヘキシルエーテル)
12)ノニオン系界面活性剤D(第一工業製薬(株)、ネオノイゲン140A、固形分100%、成分:ポリオキシエチレン−アルキルフェニルエーテル)
13)ノニオン系界面活性剤E(株式会社ADEKA製、プルロニックL−44、固形分100%、成分:プロピレンオキサイド・エチレンオキサイドブロックポリマー)
14)カチオン系界面活性剤F(ライオン(株)製、サンノール LMT−1430、固形分27%、成分:ポリオキシエチレンアルキルエーテル硫酸塩)
15)アニオン系界面活性剤G(株式会社ADEKA製、アデカコール EC−8600、固形分70%、成分:ジオクチルスルホコハク酸エステル塩)
16)アニオン系界面活性剤H(サンノプコ(株)製、ウェット50、固形分100%、成分:アルキルスルホコハク酸ナトリウム)
17)フッ素系界面活性剤I(株式会社ネオス製、フタージェント100C、パーフルオロアルケニル基含有フッ素系界面活性剤、固形分100%)
18)フッ素系界面活性剤J(DIC(株)製、メガファックF−444、パーフルオロアルキルエチレンオキシド付加物、有効成分100%)
19)アクリルエマルジョン(日本触媒(株)製、ユーダブルE−670、固形分45%)
1) Water-dispersed colloidal silica A (manufactured by Nissan Chemical Industries, Snowtex-O, solid content 20%, pH 3.8, average particle size 10-20 nm, shape: spherical, acidic type)
2) Water-dispersed colloidal silica B (manufactured by Nissan Chemical Industries, Ltd., Snowtex-C, solid content 20%, pH 9.0, average particle size 10-20 nm, shape: spherical)
3) Water-dispersed colloidal silica C (manufactured by Nissan Chemical Industries, Ltd., Snowtex-PS-SO, solid content 20%, pH 3.0, average particle size 80-120 nm, shape: pearl necklace)
4) Water-dispersed colloidal silica D (manufactured by Nissan Chemical Industries, Ltd., Snowtex-UP, solid content 20%, pH 10.0, average particle size 40-100 nm, shape: chain)
5) Isopropanol-dispersed colloidal silica E (manufactured by Nissan Chemical Industries, Ltd., IPA-ST, solid content 30%, pH 3.2, average particle size 10-20 nm, shape: spherical)
6) Tin oxide particles (manufactured by NS Co., Ltd., tin oxide sol having no photocatalytic function, solid content 20%)
7) Zinc oxide particles (byk, zinc oxide sol without photocatalyst, solid content 45%)
8) Photocatalytic titanium oxide particles (Ishihara Sangyo Co., Ltd., photocatalyst TiO 2 , average particle size 8 μm)
9) Nonionic surfactant A (manufactured by TEGO, Polyflow KL-510, solid content 100%, component: polyoxyalkylene monoalkyl ether)
10) Nonionic surfactant B (manufactured by San Nopco Co., Ltd., SN984, solid content 100%, component: polyether compound)
11) Nonionic surfactant C (Daiichi Kogyo Seiyaku Co., Ltd., New Coal 1004, solid content 100%, component: polyoxyethylene-2-ethylhexyl ether)
12) Nonionic surfactant D (Daiichi Kogyo Seiyaku Co., Ltd., Neonoigen 140A, solid content 100%, component: polyoxyethylene-alkylphenyl ether)
13) Nonionic surfactant E (manufactured by ADEKA Corporation, Pluronic L-44, solid content 100%, component: propylene oxide / ethylene oxide block polymer)
14) Cationic surfactant F (manufactured by Lion Corporation, Sannol LMT-1430, solid content 27%, component: polyoxyethylene alkyl ether sulfate)
15) Anionic surfactant G (manufactured by ADEKA Corporation, Adekacol EC-8600, solid content 70%, component: dioctylsulfosuccinate ester salt)
16) Anionic surfactant H (manufactured by San Nopco, wet 50, solid content 100%, component: sodium alkylsulfosuccinate)
17) Fluorosurfactant I (manufactured by Neos Co., Ltd., aftergent 100C, perfluoroalkenyl group-containing fluorosurfactant, solid content 100%)
18) Fluorosurfactant J (manufactured by DIC Corporation, MegaFuck F-444, perfluoroalkylethylene oxide adduct, active ingredient 100%)
19) Acrylic emulsion (manufactured by Nippon Shokubai Co., Ltd., U Double E-670, solid content 45%)

<評価結果>
表1〜表2より明らかな通り、本発明の防汚塗料組成物を使用した実施例1〜12は、優れた塗膜性能を有していた。一方、比較例1及び4の溶剤系コロイダルシリカを含有する塗料では、耐汚染性や耐候性が悪かった。比較例2及び5の有機溶剤としてエタノールを含有する塗料では、塗膜外観、耐汚染性が非常に悪かった。また、比較例3のノニオン系界面活性剤を使用しない塗料では、耐温水性及び耐雨筋汚染性が非常に悪かった。
<Evaluation results>
As is clear from Tables 1 and 2, Examples 1 to 12 using the antifouling coating composition of the present invention had excellent coating performance. On the other hand, the paint containing the solvent-based colloidal silica of Comparative Examples 1 and 4 had poor stain resistance and weather resistance. In the paint containing ethanol as the organic solvent of Comparative Examples 2 and 5, the appearance of the coating film and the stain resistance were very poor. Moreover, in the coating material which does not use the nonionic surfactant of the comparative example 3, warm water resistance and rain-stain stain resistance were very bad.

Claims (14)

建築基材上に下地塗膜用塗料を塗布し、1層又は複数層の下地塗膜を形成する工程と、
該下地塗膜上に、オーバーコート塗料の主成分として、
(a)水分散コロイダルシリカ(固形分換算)0.1〜10.0質量%と、
(b)1種類以上のノニオン系界面活性剤(固形分換算)0.01〜1.0質量%と、
(c)水89〜99質量%と
を含有し、有機系溶剤を含有しない(A)塗料組成物を塗布し、水に対する接触角が1°〜40°であるオーバーコート塗膜を形成する工程と、
を備えることを特徴とする防汚塗膜の形成方法。
Applying a base coat paint on a building substrate to form one or more layers of the base coat;
As a main component of the overcoat paint on the base coating film,
(A) water-dispersed colloidal silica (in terms of solid content) 0.1 to 10.0% by mass;
(B) one or more kinds of nonionic surfactants (in terms of solid content) 0.01 to 1.0% by mass;
(C) A step of forming an overcoat coating film containing 89 to 99% by mass of water and not containing an organic solvent (A) by applying a coating composition and having a contact angle with water of 1 ° to 40 °. When,
A method for forming an antifouling coating film, comprising:
上記(b)成分、ノニオン系界面活性剤が、ポリオキシアルキレンモノアルキルエーテルを含有する請求項1に記載の防汚塗膜の形成方法。   The method for forming an antifouling coating film according to claim 1, wherein the component (b) and the nonionic surfactant contain a polyoxyalkylene monoalkyl ether. 上記(b)成分、ノニオン系界面活性剤が、プロピレンオキサイド−エチレンオキサイド付加物を含有する請求項1又は2に記載の防汚塗膜の形成方法。   The method for forming an antifouling coating film according to claim 1 or 2, wherein the component (b) and the nonionic surfactant contain a propylene oxide-ethylene oxide adduct. 上記(A)塗料組成物が、更にフッ素系界面活性剤を含有する請求項1〜3のいずれかに記載の防汚塗膜の形成方法。   The method for forming an antifouling coating film according to any one of claims 1 to 3, wherein the (A) coating composition further contains a fluorine-based surfactant. 上記フッ素系界面活性剤が、パーフルオロアルケニル基を有する請求項4に記載の防汚塗膜の形成方法。   The method for forming an antifouling coating film according to claim 4, wherein the fluorosurfactant has a perfluoroalkenyl group. 上記(A)塗料組成物が、更に無機酸化物粒子を含有する請求項1〜5のいずれかに記載の防汚塗膜の形成方法。   The method for forming an antifouling coating film according to any one of claims 1 to 5, wherein the (A) coating composition further contains inorganic oxide particles. 上記(a)成分、水分散コロイダルシリカは、球状であり、かつ平均粒子径が10〜40nmのコロイダルシリカである請求項1〜6のいずれかに記載の防汚塗膜の形成方法。   The method for forming an antifouling coating film according to any one of claims 1 to 6, wherein the component (a) and the water-dispersed colloidal silica are colloidal silica having a spherical shape and an average particle diameter of 10 to 40 nm. 上記(A)塗料組成物は、光触媒機能材料を含有しない請求項1〜7のいずれかに記載の防汚塗膜の形成方法。   The method for forming an antifouling coating film according to any one of claims 1 to 7, wherein the coating composition (A) does not contain a photocatalytic functional material. 上記(A)塗料組成物は、高分子重合体(樹脂)成分を含有しない請求項1〜8のいずれかに記載の防汚塗膜の形成方法。   The method for forming an antifouling coating film according to any one of claims 1 to 8, wherein the coating composition (A) does not contain a polymer (resin) component. 上記下地塗膜用塗料が、結合剤としてSi−OR基(Rは水素原子又は炭素数1〜12の炭化水素基)を有する化合物を含有する請求項1〜9のいずれかに記載の防汚塗膜の形成方法。   The antifouling agent according to any one of claims 1 to 9, wherein the undercoat coating material contains a compound having a Si-OR group (R is a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms) as a binder. Method for forming a coating film. 上記下地塗膜用塗料が、艶消し剤又は骨材を含有し、艶消し塗膜又は高意匠性塗膜を形成することを特徴とする請求項1〜10のいずれかに記載の防汚塗膜の形成方法。   The antifouling coating according to any one of claims 1 to 10, wherein the paint for the base coating film contains a matting agent or an aggregate to form a matting coating film or a high-design coating film. Method for forming a film. 上記骨材が、着色骨材であることを特徴とする請求項11に記載の防汚塗膜の形成方法。   The method for forming an antifouling coating film according to claim 11, wherein the aggregate is a colored aggregate. 請求項1〜12のいずれかに記載の防汚塗膜の形成方法により得られたことを特徴とする防汚塗装物。   An antifouling paint obtained by the method for forming an antifouling coating film according to any one of claims 1 to 12. 上記防汚塗装物が建築外装材である請求項13に記載の防汚塗装物。   The antifouling paint according to claim 13, wherein the antifouling paint is a building exterior material.
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