JP2013176906A - Wooden member, coating composition for woody base material, and method for protecting woody base material - Google Patents
Wooden member, coating composition for woody base material, and method for protecting woody base material Download PDFInfo
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この発明は、主に建築物に利用され、木質基材の表面に塗料組成物によって形成された塗膜を備えた木製部材と、その木製部材に使用される木質基材用塗料組成物、及び木質基材の保護方法に関する。 The present invention is mainly used in buildings, and includes a wooden member provided with a coating film formed on the surface of a wooden substrate by the coating composition, a wooden substrate coating composition used for the wooden member, and The present invention relates to a method for protecting a wooden substrate.
従来、建築物や家具などの部材として多くの木質材料（以下、木製部材という。）が使用されている。これらの木製部材は、木の素地を露出させたまま使用することもあるが、多くの場合、表面に塗装処理を施している。 Conventionally, many wooden materials (hereinafter referred to as wooden members) are used as members of buildings and furniture. These wooden members may be used with the wood base exposed, but in many cases, the surface is coated.
塗装処理を行なう目的は様々である。例えば、木製部材は日光、紫外線、風雨などによって劣化しやすいため、木製部材の耐水性や耐久性を向上させるために塗装処理を行なうことがある。それ以外にも、木製部材は汚れが付着しやすいため、木製部材の耐汚染性の向上させるために塗装処理を行なうことがある。 The purpose of performing the painting process is various. For example, a wooden member is likely to be deteriorated by sunlight, ultraviolet rays, wind and rain, etc., and therefore, a painting process may be performed to improve the water resistance and durability of the wooden member. In addition, since the wooden member easily adheres to the dirt, a coating process may be performed in order to improve the contamination resistance of the wooden member.
一般的に、塗装処理に用いる塗料組成物としては、ステイン塗料のように、油、樹脂、ワックスなどを木製部材に浸みこませて木製部材の表面を改質するものや、木製部材の表面に塗膜を形成するものなどがある。また、木製部材に浸みこみ更に表面に塗膜を形成するものもある。 In general, the paint composition used for the coating treatment is a material that modifies the surface of the wooden member by soaking oil, resin, wax, etc. into the wooden member, such as a stain paint, or the surface of the wooden member. Some form a coating film. Some also soak into a wooden member and form a coating on the surface.
例えば、特許文献１には、木製部材の表面に塗膜を形成する塗料として、保護コロイド水溶液に粗リグノフェノール誘導体を混入したものと、アクリルエマルションとを配合してなることを特徴とする水性木材用塗料が記載されている。 For example, Patent Document 1 discloses a water-based wood comprising a mixture of a crude lignophenol derivative mixed with a protective colloid aqueous solution and an acrylic emulsion as a paint for forming a coating film on the surface of a wooden member. Paints for use are described.
また、木には調湿機能があることが知られている。木は湿度が高いときには空気中の水分を吸収し、湿度が低いときには空気中に水分を放出する特性（以下、吸放湿性という。）があり、それによって湿度の変化を抑えようとする。このとき木は、水分を吸収したときには膨張し、水分を放出したときには収縮している。 It is also known that wood has a humidity control function. Trees have a characteristic of absorbing moisture in the air when humidity is high and releasing moisture into the air when humidity is low (hereinafter referred to as moisture absorption and desorption), thereby trying to suppress changes in humidity. At this time, the tree expands when it absorbs moisture and contracts when it releases moisture.
塗膜処理には、木の吸放湿性を損なわないことが求められることがあり、このようなときには、木への水分の出入りを妨害しないように透湿性がある塗料が使用される。一方、木の膨張収縮による体積変化を抑えることが求められることもあり、このようなときには、木への水分の出入りを抑制するために防湿性がある塗料が使用される。 The coating film treatment may be required not to impair the moisture absorption / release properties of wood, and in such a case, a paint having moisture permeability is used so as not to interfere with moisture entering and exiting the wood. On the other hand, it is sometimes required to suppress the volume change due to the expansion and contraction of the tree, and in such a case, a moisture-proof paint is used in order to prevent moisture from entering and exiting the tree.
木の表面に防湿性がある透湿度の小さい層を形成したものとして、特許文献２等がある。特許文献２には、木質単板の表面に透湿度が１００ｇ／ｍ２・２４ｈｒ以下である複合フィルム層を形成した複合フィルム被覆木質化粧材が記載されている。 Patent Document 2 and the like are examples in which a moisture-proof layer having a low moisture permeability is formed on the surface of a tree. Patent Document 2 describes a composite film-covered wooden decorative material in which a composite film layer having a moisture permeability of 100 g / m 2 · 24 hr or less is formed on the surface of a wood veneer.
透湿性がある塗料によって塗装処理をした木製部材は吸放湿によって膨張収縮を繰り返す。また、木製部材が反り等によって変形することがあった。塗装処理によって木製部材の表面に塗膜を形成した場合には、木製部材の膨張収縮や変形によって、塗膜にもクラックが発生し、そのクラックから侵入した水によって木製部材が劣化することがあった。そのため、塗装処理によって木製部材の表面に塗膜を形成したとしても十分な耐久性が得られない場合があった。 A wooden member coated with moisture-permeable paint repeatedly expands and contracts due to moisture absorption and desorption. Further, the wooden member may be deformed by warpage or the like. When a coating film is formed on the surface of a wooden member by painting, cracks may occur in the coating film due to expansion and contraction or deformation of the wooden member, and the wooden member may be deteriorated by water entering from the crack. It was. For this reason, even if a coating film is formed on the surface of the wooden member by a coating process, sufficient durability may not be obtained.
防湿性がある透湿度の小さい塗料を使用すると膨張収縮や変形を低減することができるが、僅かな膨張収縮や変形を完全に抑制することは難しい。そのため木製部材を長期間にわたって使用した場合には、僅かな膨張収縮を繰り返しや変形によって塗膜にクラックが発生して十分な耐久性が得られない場合があった。 The use of a moisture-proof coating material with low moisture permeability can reduce expansion and contraction and deformation, but it is difficult to completely suppress slight expansion and contraction and deformation. Therefore, when a wooden member is used over a long period of time, cracks may occur in the coating film due to repeated slight expansion and contraction or deformation, and sufficient durability may not be obtained.
本発明は、優れた耐久性を持った木製部材を提供することを目的とする。また、木製部材に用いる木質基材用塗料組成物、及びその塗料組成物を使用した木質基材の保護方法を提供することを目的とする。 An object of the present invention is to provide a wooden member having excellent durability. Moreover, it aims at providing the protection method of the wooden base material which uses the coating composition for wooden base materials used for a wooden member, and the coating composition.
請求項１に記載の発明は、木質基材の表面の全部又は一部に、塗料組成物によって形成された塗膜を有する木製部材であって、前記塗膜の透湿度が０．２〜８０ｇ／ｍ２・２４ｈｒであり、前記塗料組成物のＪＩＳ Ａ６０２１：２０１１にしたがって測定した破断時の伸び率が１００〜５００％であることを特徴とする木製部材である。 Invention of Claim 1 is a wooden member which has the coating film formed with the coating composition in all or one part of the surface of a wooden base material, Comprising: The water vapor transmission rate of the said coating film is 0.2-80g. / M 2 · 24 hr, the wooden composition is characterized in that the elongation percentage at break of the coating composition measured according to JIS A6021: 2011 is 100 to 500%.
請求項２に記載の発明は、請求項１に記載の木製部材において、前記塗料組成物のＪＩＳ Ａ６０２１：２０１１にしたがって測定した引張強さが０．６０Ｎ／ｍｍ２以上であることを特徴とする。 The invention according to claim 2 is the wooden member according to claim 1, wherein the coating composition has a tensile strength measured according to JIS A6021: 2011 of 0.60 N / mm 2 or more. .
請求項３に記載の発明は、請求項１又は２に記載の木製部材において、前記塗膜の膜厚が、０．０５〜５．００ｍｍであることを特徴とする。 The invention according to claim 3 is the wooden member according to claim 1 or 2, wherein the thickness of the coating film is 0.05 to 5.00 mm.
請求項５に記載の発明は、木質基材の表面に所定の膜厚の塗膜を形成するために用いる塗料組成物であって、該塗料組成物のＪＩＳ Ａ６０２１：２０１１にしたがって測定した破断時の伸び率が１００〜５００％であり、塗料組成物によって所定の膜厚に形成される塗膜の透湿度が０．２〜８０ｇ／ｍ２・２４ｈｒであることを特徴とする木質基材用塗料組成物である。 Invention of Claim 5 is a coating composition used in order to form the coating film of predetermined film thickness on the surface of a wooden base material, Comprising: At the time of the fracture | rupture measured according to JIS A6021: 2011 of this coating composition The wood substrate is characterized in that the elongation percentage of the coating film is 100 to 500%, and the moisture permeability of the coating film formed to a predetermined film thickness by the coating composition is 0.2 to 80 g / m 2 · 24 hr It is a coating composition.
請求項６に記載の発明は、木質基材の表面に防黴剤、防腐剤、及び防虫剤から選択される１種類以上を含有する木質基材保存剤を塗布した後に、請求項５に記載の木質部材用塗料組成物によって木質基材の表面に塗膜を形成することを特徴とする木質基材の保護方法である。 The invention according to claim 6 is the invention according to claim 5, after applying a wood substrate preservative containing at least one selected from antifungal agents, preservatives, and insect repellents on the surface of the wood substrate. A method for protecting a wooden substrate, comprising forming a coating film on the surface of the wooden substrate by using the coating composition for a wooden member.
請求項１に記載の発明によれば、耐久性に優れた木製部材を提供することができる。また、請求項２及び３に記載の発明によれば、より耐久性に優れた木製部材が得られる According to invention of Claim 1, the wooden member excellent in durability can be provided. Moreover, according to invention of Claim 2 and 3, the wooden member excellent in durability is obtained.
請求項４に記載の発明によれば、耐久性に優れた木製部材を形成可能な木質基材用塗料組成物を提供することができる。 According to invention of Claim 4, the coating composition for woody base materials which can form the wooden member excellent in durability can be provided.
請求項５に記載の発明によれば、より長期間にわたって木質基材を保護することができる。 According to invention of Claim 5, a wooden base material can be protected over a long period of time.
本発明の木製部材は、木質基材の表面の全部又は一部に、塗料組成物によって形成された塗膜を有するものである。 The wooden member of the present invention has a coating film formed of the coating composition on the whole or a part of the surface of the wooden substrate.
前記塗膜は、透湿度が０．２〜８０ｇ／ｍ２・２４ｈｒであって、前記塗料組成物は、ＪＩＳ Ａ６０２１：２０１１にしたがって測定した破断時の伸び率が１００〜５００％である。 The coating film has a moisture permeability of 0.2 to 80 g / m 2 · 24 hr, and the coating composition has an elongation at break of 100 to 500% as measured in accordance with JIS A6021: 2011.
透湿度が０．２〜８０ｇ／ｍ２・２４ｈｒであることで、塗膜にクラックなどの欠陥が発生しにくくなる。これは、透湿度の小さい塗膜が木質基材の吸放湿を抑制し、それによって木質基材の膨張収縮が低減されるからだと推測される。
また、破断時の伸び率が１００〜５００％であることにより、塗膜にクラックなどの欠陥が発生しにくくなる。これは、木質基材の僅かな膨張収縮の繰り返しや変形に塗膜が追従できるからだと推測される。
When the moisture permeability is 0.2 to 80 g / m 2 · 24 hr, defects such as cracks are hardly generated in the coating film. This is presumed to be because the coating film having a low moisture permeability suppresses the moisture absorption / release of the wooden substrate, thereby reducing the expansion and contraction of the wooden substrate.
Moreover, it becomes difficult to generate | occur | produce defects, such as a crack, in a coating film because the elongation rate at the time of a fracture | rupture is 100-500%. This is presumably because the coating film can follow the slight expansion and contraction and deformation of the wooden substrate.
前記木製部材は、主には建築物の内壁、外壁、柱、梁などに使用される部材である。また、柵、塀、杭などの土木構造物、椅子、棚などの家具に使用される木製部材であてもよい。また、この木製部材は、建築物等に取り付けたり設置したりする部材に予め塗膜を形成したものに限らず、既に建築物等に取り付けられている部材に塗料組成物を塗装して塗膜を形成したものであってもよい。 The said wooden member is a member mainly used for the inner wall of a building, an outer wall, a pillar, a beam, etc. Moreover, the wooden member used for civil engineering structures, such as a fence, a fence, a pile, and furniture, such as a chair and a shelf, may be sufficient. In addition, this wooden member is not limited to a member in which a coating film is formed in advance on a member to be attached or installed on a building or the like, and a coating composition is applied to a member already attached to a building or the like. May be formed.
前記木質基材は、その材質は木であればその種類は特に限定されない。例えば、杉、松、ヒノキ、ケヤキ、ワラン、ホワイトウッド、スプルーフス、スプルースなどの木によって形成されたものであればよい。また、合板、集成材、或いはパーティクルボードのように複数の木片から形成されたものでもよい。 The wood base material is not particularly limited as long as the material is wood. For example, what is necessary is just to be formed of trees, such as a cedar, a pine, a cypress, a zelkova, a waran, a white wood, a proof, and a spruce. Moreover, what was formed from several wood pieces like a plywood, a laminated material, or a particle board may be used.
前記塗料組成物は、ＪＩＳ Ａ６０２１：２０１１にしたがって測定した破断時の伸び率が１００〜５００％である。破断時の伸び率はより好ましくは２００〜４５０％であり、特に好ましくは３００〜４００％である。なお、この破断時の伸び率はＪＩＳ Ａ６０２１：２０１１のアクリルゴム系外壁用塗膜防水材の試験方法によって測定する。破断時の伸び率が２００〜５００％であれば、塗膜の欠陥がより発生しにくくなる。
前記破断時の伸び率が１００％未満の場合には、木質基材の僅かな膨張収縮の繰り返しや変形に対する塗膜の追従が十分でない場合がある。逆に破断時の伸び率が５００％を超える場合には、塗膜が軟らかすぎて塗膜表面に傷がつきやすくなったり、塗膜に汚れが付着したりするおそれがある。
The coating composition has an elongation at break of 100 to 500% as measured in accordance with JIS A6021: 2011. The elongation at break is more preferably 200 to 450%, particularly preferably 300 to 400%. The elongation at break is measured by a test method for a waterproof coating material for an acrylic rubber outer wall according to JIS A6021: 2011. If the elongation at break is 200 to 500%, defects in the coating film are less likely to occur.
When the elongation at break is less than 100%, the coating of the coating film may not be sufficient for repeated slight expansion and contraction or deformation of the wooden substrate. On the other hand, when the elongation at break exceeds 500%, the coating film is too soft and the surface of the coating film is likely to be damaged or the coating film may be contaminated.
前記塗料組成物は、結合材として合成樹脂を含有する塗料組成物であり、前記の透湿度及び破断時の伸び率の条件を満たすものであれば、その組成は特に限定されない。 The coating composition is a coating composition containing a synthetic resin as a binder, and the composition is not particularly limited as long as it satisfies the above conditions of moisture permeability and elongation at break.
前記合成樹脂としては、アクリル樹脂、スチレン樹脂、ウレタン樹脂、シリコーン樹脂、フッ素樹脂、エポキシ樹脂、メラミン樹脂、アルキッド樹脂、塩化ビニル樹脂、酢酸ビニル樹脂、ポリエステル樹脂などの合成樹脂を単独又は共重合したものを用いればよい。また、２種類以上の合成樹脂を混合して用いてもよい。 As the synthetic resin, a synthetic resin such as an acrylic resin, a styrene resin, a urethane resin, a silicone resin, a fluorine resin, an epoxy resin, a melamine resin, an alkyd resin, a vinyl chloride resin, a vinyl acetate resin, or a polyester resin is used alone or copolymerized. What is necessary is just to use. Two or more kinds of synthetic resins may be mixed and used.
また、塗料組成物は、合成樹脂以外の添加剤や顔料を含有してもよい。 The coating composition may contain additives and pigments other than synthetic resins.
前記添加剤としては、通常、塗料組成物に用いられるものを使用でき、例えば、粘性調整剤、分散剤、消泡剤、造膜助剤、湿潤剤、凍結防止剤、架橋剤、酸化防止剤、紫外線吸収剤、光安定化剤、レベリング剤、シランカップリング剤等が挙げられる。また、防黴剤、防腐剤、及び防虫剤を使用してもよい。 As said additive, what is normally used for a coating composition can be used, for example, a viscosity modifier, a dispersing agent, an antifoamer, a film-forming aid, a wetting agent, an antifreezing agent, a crosslinking agent, an antioxidant. , Ultraviolet absorbers, light stabilizers, leveling agents, silane coupling agents and the like. Moreover, you may use an antifungal agent, antiseptic | preservative, and an insect repellent.
これらの中でも、紫外線吸収剤を添加しておくと、木質基材への紫外線の照射を抑制し、木製部材の耐久性をより向上させることができる。木質基材の表面が紫外線によって劣化すると、木質基材と塗膜との密着性が低下するなどの現象が発生するので、木製部材の耐久性を損ないやすい。また、木質基材が劣化することで、木製部材の美観も損なわれる。 Among these, when an ultraviolet absorber is added, the irradiation of the ultraviolet rays to the wooden substrate can be suppressed, and the durability of the wooden member can be further improved. When the surface of the wooden base material is deteriorated by ultraviolet rays, a phenomenon such as a decrease in the adhesion between the wooden base material and the coating film occurs, so that the durability of the wooden member is easily impaired. Moreover, the aesthetics of a wooden member are also impaired because a wooden base material deteriorates.
紫外線吸収剤としては、公知のものを用いればよく、例えば、ベンゾトリアゾール系化合物、トリアジン系化合物、ベンゾフェノン系化合物、シュウ酸アニリド系化合物などを使用することができる。これらの化合物は、単独で用いても、２種類以上の化合物を併用してもよい。 As the ultraviolet absorber, a known one may be used. For example, a benzotriazole compound, a triazine compound, a benzophenone compound, an oxalic acid anilide compound, or the like can be used. These compounds may be used alone or in combination of two or more compounds.
前記顔料としては、酸化チタン、酸化亜鉛、黄鉛、亜鉛華、黄色酸化鉄、ベンガラ、カーボンブラック、カドミウムレッド、モリブデンレッド、クロムエロー、酸化クロム、プルシアンブルー、コバルトブルー等の無機系着色顔料、アゾ顔料、ジケトピロロピロール顔料、ベンズイミダゾロン顔料、フタロシアニン顔料、キナクリドン顔料、イソインドリン顔料、イソインドリノン顔料、スレン系顔料、ペリレン顔料、ペリノン顔料、ジオキサン系顔料等の有機系着色顔料、タルク、クレー、炭酸カルシウム等の体質顔料などを使用することができる。 Examples of the pigment include inorganic color pigments such as titanium oxide, zinc oxide, yellow lead, zinc white, yellow iron oxide, bengara, carbon black, cadmium red, molybdenum red, chromium yellow, chromium oxide, Prussian blue, and cobalt blue, azo Pigments, diketopyrrolopyrrole pigments, benzimidazolone pigments, phthalocyanine pigments, quinacridone pigments, isoindoline pigments, isoindolinone pigments, selenium pigments, perylene pigments, perinone pigments, dioxane pigments and other organic color pigments, talc, Extender pigments such as clay and calcium carbonate can be used.
前記塗料組成物の引張強さは、０．６０Ｎ／ｍｍ２以上であることが好ましく、０．８０Ｎ／ｍｍ２以上であることがより好ましく、１．００Ｎ／ｍｍ２以上であることが特に好ましい。なお、この引張強さはＪＩＳ Ａ６０２１：２０１１のアクリルゴム系外壁用塗膜防水材の試験方法によって測定する。
引張強さが前記の数値以上であることによって、木質基材の表面の膨張収縮による動き、特に収縮による動きを抑制できるため塗膜の欠陥がより発生しにくくなり、より耐久性に優れた木製部材が得られる。
Tensile strength of the coating composition, is preferably 0.60N / mm 2 or more, more preferably 0.80 N / mm 2 or more, and particularly preferably 1.00 N / mm 2 or more . In addition, this tensile strength is measured by the test method of the acrylic rubber-type outer wall paint film waterproofing material of JIS A6021: 2011.
When the tensile strength is equal to or higher than the above value, the movement of the surface of the wooden substrate due to expansion and contraction, especially the movement due to the contraction, can be suppressed, so that defects in the coating film are less likely to occur, and the wood has superior durability. A member is obtained.
前記塗料組成物によって形成される塗膜は、所定の厚みに形成した塗膜の透湿度が０．２〜８０ｇ／ｍ２・２４ｈｒである。なお、この透湿度はＪＩＳ Ｚ０２０８：１９７６（カップ法）にしたがって測定する。
所定の厚みとは木質基材の表面に形成された塗膜の厚みであり、木製部材の仕様によって異なる。ＪＩＳ Ｚ０２０８：１９７６の透湿度の測定には塗膜のみを使用するので、木製部材から塗膜を剥離して測定する。或いは、木製部材に塗膜を形成した塗料組成物を用いて所定の厚みの塗膜を作製して、その塗膜の透湿度を測定してもよい。
The coating film formed by the coating composition has a moisture permeability of 0.2 to 80 g / m 2 · 24 hr of the coating film formed to have a predetermined thickness. The moisture permeability is measured according to JIS Z0208: 1976 (cup method).
The predetermined thickness is the thickness of the coating film formed on the surface of the wooden substrate, and varies depending on the specifications of the wooden member. Since only the coating film is used for the measurement of the moisture permeability of JIS Z0208: 1976, the coating film is peeled off from the wooden member and measured. Or you may produce the coating film of predetermined thickness using the coating composition which formed the coating film in the wooden member, and may measure the water vapor transmission rate of the coating film.
前記透湿度はより好ましくは３〜５０ｇ／ｍ２・２４ｈｒであり、特に好ましくは５〜３０ｇ／ｍ２・２４ｈｒである。この範囲にあるとき、木質基材の膨張収縮を低減することができるため、より耐久性に優れた木製部材が得られる。前記透湿度が０．２ｇ／ｍ２・２４ｈｒ未満である場合には、木質基材の含水率が高い場合に木質基材そのものが腐食しやすくなるおそれがある。逆に８０ｇ／ｍ２・２４ｈｒを超える場合には木質基材からの水分蒸発が多すぎて木質基材にクラックが生じやすくなるおそれがある。 The moisture permeability is more preferably 3 to 50 g / m 2 · 24 hr, and particularly preferably 5 to 30 g / m 2 · 24 hr. When in this range, the expansion and contraction of the wooden base material can be reduced, so that a wooden member having higher durability can be obtained. When the moisture permeability is less than 0.2 g / m 2 · 24 hr, the wood substrate itself may be easily corroded when the moisture content of the wood substrate is high. On the other hand, when it exceeds 80 g / m 2 · 24 hr, there is a possibility that cracks are likely to occur in the wooden substrate due to excessive moisture evaporation from the wooden substrate.
また、前記塗膜は透明な塗膜であることが好ましい。それによって、木の素材感や風合いを生かすことができる。建築物等に木製部材を使用するときには、木の質感による意匠性を得ることを目的にしている場合が多いので、塗膜は透明であることが好ましい。 Moreover, it is preferable that the said coating film is a transparent coating film. As a result, the texture and texture of wood can be utilized. When a wooden member is used for a building or the like, the coating film is preferably transparent because it is often intended to obtain a design with a texture of wood.
具体的な透明度としては、塗膜の可視光波長領域における全光線透過率が８０％以上、ヘイズ値が１０．０以下であることが好ましい。なお、塗膜の全光線透過率とヘイズ値は、ＪＩＳ Ｋ７１０５、ＪＩＳ Ｋ７１３６、及びＪＩＳ Ｋ７３６１−１に準じて測定できる。
塗料組成物によって木質基材の表面に塗膜を形成するため、塗膜の全光線透過率が小さ過ぎたり、ヘイズ値が大きすぎたりすると、木の木目がぼやけてしまうなどして、木の素材感が薄れてしまう。より木の素材感や風合いを活かすに、塗膜の全光線透過率が８５％以上、ヘイズ値が５．０以下であることがより好ましい。
As specific transparency, it is preferable that the total light transmittance in the visible light wavelength region of the coating film is 80% or more and the haze value is 10.0 or less. In addition, the total light transmittance and haze value of a coating film can be measured according to JIS K7105, JIS K7136, and JIS K7361-1.
Since the coating composition forms a coating film on the surface of the wooden substrate, if the total light transmittance of the coating film is too small or the haze value is too large, the grain of the tree will be blurred, etc. The texture will fade. In order to make use of the texture and texture of wood, it is more preferable that the total light transmittance of the coating film is 85% or more and the haze value is 5.0 or less.
前記塗膜の膜厚は、０．０５〜５．００ｍｍであることが好ましく、０．０８〜４．００ｍｍであることがより好ましく、０．１〜３．００ｍｍであることが特に好ましい。塗膜が薄すぎると、塗膜が木質基材の膨張収縮に十分に追従してできずに、塗膜にクラック等の欠陥が生じやすくなる。逆に、膜厚が厚すぎると、前記の全光線透過率とヘイズ値が得がたい。また、全光線透過率とヘイズ値が十分であっても、膜厚が厚すぎると木の素材感や風合いが損なわれる。よって、塗膜が十分な性能を発揮し、且つ木の素材感や風合いを活かすには膜厚が前記範囲にあることが好ましい。 The film thickness of the coating film is preferably 0.05 to 5.00 mm, more preferably 0.08 to 4.00 mm, and particularly preferably 0.1 to 3.00 mm. If the coating film is too thin, the coating film cannot sufficiently follow the expansion and contraction of the wooden substrate, and defects such as cracks are likely to occur in the coating film. Conversely, if the film thickness is too thick, it is difficult to obtain the total light transmittance and haze value. Moreover, even if the total light transmittance and the haze value are sufficient, if the film thickness is too thick, the texture and texture of the wood are impaired. Therefore, it is preferable that the film thickness is in the above range in order for the coating film to exhibit sufficient performance and to make use of the texture and texture of wood.
塗料組成物によって木質基材の表面に塗膜を形成するには、木質基材に塗料組成物を塗布して乾燥、硬化させればよい。塗布方法は特に限定しないが、ローラー、ハケ、エアスプレー、エアガン、エアレススプレー、エアレスガン等の一般に用いられる塗装器具や塗装機を使って塗布すればよい。 In order to form a coating film on the surface of a wooden substrate by the coating composition, the coating composition may be applied to the wooden substrate, dried and cured. Although the application method is not particularly limited, it may be applied using a commonly used coating instrument or coating machine such as a roller, brush, air spray, air gun, airless spray, or airless gun.
なお、木質基材に塗膜を形成する部分は任意であって、木質基材の表面全体に塗膜を形成してもよいし、表面の一部にのみ形成してもよい。例えば、木製部材が建築物の外壁に使用する場合などは、木の劣化要因である水や日光や紫外線などに曝される部分にのみに塗膜を形成するだけでも、十分な耐久性が得られる。 In addition, the part which forms a coating film in a wooden base material is arbitrary, A coating film may be formed in the whole surface of a wooden base material, and may be formed only in a part of surface. For example, when wooden members are used on the outer wall of a building, sufficient durability can be obtained by forming a coating only on the parts exposed to water, sunlight, ultraviolet rays, etc. It is done.
木質基材に塗料組成物を塗布する前に、木質基材と塗膜との密着性向上などを目的としたプライマー塗料や、木材保存剤を塗布しておいてもよい。 Before applying the coating composition to the wooden substrate, a primer coating for the purpose of improving the adhesion between the wooden substrate and the coating film or a wood preservative may be applied.
特に、木材保存剤として、防黴剤、防腐剤、防虫剤を含むものを予め塗布しておくと、木質基材の劣化を抑えることができ、木製部材の耐久性を更に向上させることができる。また、木質基材の黴や腐食を抑えることで、木製部材の美観も維持することができる。これらは、１種類だけ用いてもよいし、目的によって２種類以上を併用してもよい。
防黴剤、防腐剤、防虫剤は、塗料組成物に添加しておくこともできるが、木質基材に直接塗布した後に塗料組成物による塗膜を形成した方が、より効果を発揮する。
In particular, when a preservative containing a fungicide, an antiseptic, or an insect repellent is previously applied as a wood preservative, deterioration of the wood base material can be suppressed, and the durability of the wooden member can be further improved. . Moreover, the beauty | look of a wooden member can also be maintained by suppressing the wrinkles and corrosion of a wooden base material. These may be used alone or in combination of two or more depending on the purpose.
Antifungal agents, preservatives, and insect repellents can be added to the coating composition, but it is more effective to form a coating film with the coating composition after being directly applied to the wooden substrate.
防黴剤としては、公知のものを用いればよく、例えば、トリアゾール系化合物、フタルイミド系化合物、スファミド系化合物、ニトリル系化合物、ベンゾチアゾール系化合物、チオシアネート系化合物などを用いることができる。これらの化合物は、単独で用いても、２種類以上の化合物を併用してもよい。 Known antifungal agents may be used, and for example, triazole compounds, phthalimide compounds, sphamide compounds, nitrile compounds, benzothiazole compounds, thiocyanate compounds, and the like can be used. These compounds may be used alone or in combination of two or more compounds.
防腐剤としては、公知のものを用いればよく、例えば、有機ヨード系化合物、トリアゾール系化合物などを用いることができる。これらの化合物は、単独で用いても、２種類以上の化合物を併用してもよい。 As the preservative, known ones may be used. For example, organic iodine compounds, triazole compounds and the like can be used. These compounds may be used alone or in combination of two or more compounds.
防虫剤としては、公知のものを用いればよく、例えば、有機リン系化合物、カルバメート系化合物、ピレスロイド系化合物、フェニルピラゾール系化合物、フェニルピラゾール系化合物などを用いることができる。これらの化合物は、単独で用いても、２種類以上の化合物を併用してもよい。 As the insect repellent, known ones may be used. For example, organophosphorus compounds, carbamate compounds, pyrethroid compounds, phenylpyrazole compounds, phenylpyrazole compounds and the like can be used. These compounds may be used alone or in combination of two or more compounds.
木材保存剤の塗布量は、木材保存剤の種類や木質基材の材質や状態などによって適宜決定すればよい。 The coating amount of the wood preservative may be appropriately determined depending on the type of wood preservative, the material and state of the wooden substrate, and the like.
木製部材を作製して、耐久性を評価した。木製部材の仕様、評価方法、評価結果を以下に記す。 Wooden members were prepared and evaluated for durability. The specifications, evaluation methods, and evaluation results of wooden members are described below.
（木質基材）
木質基材は、２００ｍｍ×４００ｍｍ×厚み３０ｍｍの杉板とした。
また、実施例１０の木質基材は、杉板に予めトリアゾール系木材保存剤を塗布しておいた。なお、トリアゾール系木材保存剤は防腐及び防黴の効果がある。
(Wood base)
The woody base material was a cedar board of 200 mm × 400 mm × thickness 30 mm.
In addition, the wood substrate of Example 10 had a triazole wood preservative applied in advance to a cedar board. Triazole wood preservatives have antiseptic and antifungal effects.
（塗料組成物）
塗料組成物の組成、ＪＩＳ Ａ６０２１：２０１１にしたがって測定した破断時の伸び率及び引張強さを表１に示す。
なお、表１中の各材料の詳細は以下の通りである。
塗料組成物としては、塗料Ａ、塗料Ｂ、塗料Ｃ、塗料Ｄ、塗料Ｅ、塗料Ｆ、塗料Ｇ、塗料Ｈ、及び塗料Ａに紫外線吸収剤及び／又は木材保存剤を添加したものを使用した。
塗料Ａの組成は、アクリルシリコ−ン共重合樹脂エマルジョン（不揮発分５６質量％、ガラス転移点−１５℃）１００質量部、添加剤（増膜助剤、粘性調整剤、消泡剤）５質量部。
塗料Ｂの組成は、アクリルスチレン共重合樹脂エマルジョン（不揮発分４９質量％、ガラス転移点−２５℃）１００質量部、添加剤（増膜助剤、粘性調整剤、消泡剤）４質量部。
塗料Ｃの組成は、アクリル樹脂エマルジョン（不揮発分５０質量％、ガラス転移点０℃）１００質量部、添加剤（増膜助剤、粘性調整剤、消泡剤）５質量部。
塗料Ｄの組成は、アクリル樹脂エマルジョン（不揮発分４６質量％、ガラス転移点８℃）１００質量部、添加剤（増膜助剤、粘性調整剤、消泡剤）５．５質量部。
塗料Ｅの組成は、塗料Ａと同じアクリルシリコ−ン共重合樹脂エマルジョン（不揮発分５６質量％、ガラス転移点−１５℃）１００質量部、コロイダルシリカ５質量部、添加剤（増膜助剤、粘性調整剤、消泡剤）５質量部。
塗料Ｆの組成は、塗料Ａと同じアクリルシリコ−ン共重合樹脂エマルジョン（不揮発分５６質量％、ガラス転移点−１５℃）１００質量部、酸化チタン５質量部、炭酸カルシウム１０質量部、添加剤（界面活性剤、増膜助剤、粘性調整剤、消泡剤）７質量部。
塗料Ｇの組成は、アクリルスチレン共重合樹脂（不揮発分４５質量％、ガラス転移点２５℃）１００質量部、添加剤（増膜助剤、粘性調整剤、消泡剤）９質量部。
塗料Ｈの組成はアクリルシリコーン共重合樹脂エマルジョン（不揮発分５２％、ガラス転移点−３５℃）、添加剤（増膜助剤、粘性調整剤、消泡剤）４質量部である。
紫外線吸収剤は、ヒドロキシフェニルトリアジン系紫外線吸収剤。
木材保存剤は、トリアゾール系木材保存剤。
(Coating composition)
Table 1 shows the composition of the coating composition, the elongation at break and the tensile strength measured according to JIS A6021: 2011.
The details of each material in Table 1 are as follows.
As the paint composition, paint A, paint B, paint C, paint D, paint E, paint F, paint G, paint H, and paint A to which an ultraviolet absorber and / or a wood preservative were added were used. .
The composition of the coating A is 100 parts by mass of an acrylic silicone copolymer resin emulsion (non-volatile content 56% by mass, glass transition point -15 ° C.), additive (film increasing aid, viscosity adjusting agent, antifoaming agent) 5 parts by mass. Department.
The composition of the coating material B is 100 parts by mass of an acrylic styrene copolymer resin emulsion (non-volatile content: 49% by mass, glass transition point: -25 ° C.), and 4 parts by mass of additives (film increasing aids, viscosity modifiers, antifoaming agents).
The composition of the paint C is 100 parts by mass of an acrylic resin emulsion (non-volatile content: 50% by mass, glass transition point: 0 ° C.), and 5 parts by mass of additives (film increasing aid, viscosity modifier, antifoaming agent).
The composition of the coating material D is 100 parts by mass of an acrylic resin emulsion (non-volatile content 46% by mass, glass transition point 8 ° C.), and 5.5 parts by mass of additives (film increasing aid, viscosity modifier, antifoaming agent).
The composition of the coating E is 100 parts by mass of the same acrylic silicone copolymer resin emulsion (non-volatile content 56% by mass, glass transition point -15 ° C.) as the coating A, 5 parts by mass of colloidal silica, additive (film increasing aid, Viscosity adjusting agent, antifoaming agent) 5 parts by mass.
The composition of the paint F is 100 parts by weight of the same acrylic silicone copolymer resin emulsion (non-volatile content 56% by weight, glass transition point-15 ° C.) as the paint A, 5 parts by weight of titanium oxide, 10 parts by weight of calcium carbonate, and additives. (Surfactant, film increasing aid, viscosity modifier, antifoaming agent) 7 parts by mass.
The composition of the paint G is 100 parts by mass of an acrylic styrene copolymer resin (non-volatile content 45% by mass, glass transition point 25 ° C.), and 9 parts by mass of additives (film increasing aid, viscosity modifier, antifoaming agent).
The composition of the coating material H is an acrylic silicone copolymer resin emulsion (non-volatile content 52%, glass transition point -35 ° C.), and 4 parts by mass of additives (film increasing aid, viscosity modifier, antifoaming agent).
The UV absorber is a hydroxyphenyl triazine UV absorber.
The wood preservative is a triazole wood preservative.
（木製部材）
前記木質基材に、前記の各塗料組成物を塗装して木製部材を作製した。塗料組成物によって形成された塗膜の乾燥膜厚及び透湿度を表１及び表２に示す。
(Wooden material)
Each wooden composition was prepared by coating each of the above-mentioned coating compositions on the wooden substrate. Tables 1 and 2 show the dry film thickness and moisture permeability of the coating film formed by the coating composition.
（評価方法）
木製部材の耐久性を評価するために、屋外曝露試験を行なった。木製部材を水平から３０度の角度で表面が南面になるようにして屋外に設置し、１６ヶ月間静置した。なお、実施例１〜７及び比較例１の木製部材は各３個ずつ曝露した。
その後、木製部材の表面を目視で観察して、以下のように評価した。評価結果を表１に示す。
〇：塗膜に異常がない。
△：塗膜に割れ、膨れ、汚れ等の異常が見られる、又は木質基材に異常がみられ
る。
×：塗膜の剥離、脱落が見られる。
(Evaluation method)
In order to evaluate the durability of the wooden member, an outdoor exposure test was conducted. The wooden member was installed outdoors at an angle of 30 degrees from the horizontal so that the surface was the south surface, and allowed to stand for 16 months. In addition, the wooden members of Examples 1 to 7 and Comparative Example 1 were exposed three by three.
Thereafter, the surface of the wooden member was visually observed and evaluated as follows. The evaluation results are shown in Table 1.
○: There is no abnormality in the coating film.
(Triangle | delta): Abnormality, such as a crack, a swelling, and a dirt, is seen in a coating film, or abnormality is seen in a wooden base material.
X: Peeling and dropping of the coating film are observed.
（評価結果）
塗膜の透湿度が小さく、十分な伸び率がある実施例１〜１４の木製部材では、塗膜に異常が見られなかったが、伸び率が小さい比較例１の木製部材では、塗膜が剥離してしまっており、塗膜はほとんど残っていなかった。そのため、木製部材の表面は、劣化と汚れによって黒く変色してしまっていた。
比較例２の木製部材は、実施例１〜１４の木製部材と比較して塗膜の汚れが酷く、屋外曝露前の木製部材から大きく変色していた。
比較例３の木製部材は、塗膜には異常は見られなかったが、木製基材の表面がやや腐食して変色していた。
また、紫外線吸収剤を添加していない実施例１〜６、実施例８、及び実施例１１〜１４の木製部材は、塗膜の異常はなかったが、木質基材の表面がやや白っぽく変色していた。一方、紫外線吸収剤を添加した実施例７及び実施例９〜１０の木製部材では、そのような変色は見られなかった。
また、木材保存剤を添加していない実施例１〜７、及び実施例１１〜１４の木製部材では、木質基材の表面に僅かに黴が発生しているものも見られたが、木材保存剤を添加した実施例８〜９の木製部材と木材保存剤を木質基材に塗装しておいた実施例１０の木製部材では黴は見られなかった。
(Evaluation results)
In the wooden members of Examples 1 to 14 in which the moisture permeability of the coating film was small and the elongation was sufficient, no abnormality was observed in the coating film, but in the wooden member of Comparative Example 1 having a small elongation, the coating film was It had peeled off and almost no coating film remained. For this reason, the surface of the wooden member has turned black due to deterioration and dirt.
The wooden member of Comparative Example 2 was severely stained with the coating film as compared with the wooden members of Examples 1 to 14, and was greatly discolored from the wooden member before outdoor exposure.
The wooden member of Comparative Example 3 showed no abnormality in the coating film, but the surface of the wooden base material was slightly corroded and discolored.
Moreover, although the wooden member of Examples 1-6, Example 8, and Examples 11-14 which did not add an ultraviolet absorber did not have abnormality of a coating film, the surface of a wooden base material discolored a little whitish. It was. On the other hand, such discoloration was not observed in the wooden members of Examples 7 and 9 to 10 to which the ultraviolet absorber was added.
In addition, in the wooden members of Examples 1 to 7 and Examples 11 to 14 to which no wood preservative was added, some woods were slightly wrinkled on the surface of the wooden base material, but the wood preservation was also observed. No wrinkles were observed in the wooden members of Examples 8 to 9 to which the agent was added and the wooden members of Example 10 in which the wood preservative was coated on the wooden substrate.
Claims (5)
前記塗膜の透湿度が０．２〜８０ｇ／ｍ２・２４ｈｒであり、
前記塗料組成物のＪＩＳ Ａ６０２１：２０１１にしたがって測定した破断時の伸び率が１００〜５００％であることを特徴とする木製部材。 A wooden member having a coating film formed by a coating composition on the whole or a part of the surface of a wooden substrate,
The moisture permeability of the coating film is 0.2 to 80 g / m 2 · 24 hr,
A wooden member having an elongation at break of 100 to 500% measured according to JIS A6021: 2011 of the coating composition.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016190433A1 (en) * | 2015-05-27 | 2016-12-01 | 関西ペイント株式会社 | Pest-repellent coating composition and method for repelling pest using same |
| JP2019069538A (en) * | 2017-10-06 | 2019-05-09 | 有限会社奈良研究所 | Wood article and method for manufacturing the same |
| JP2019081822A (en) * | 2017-10-27 | 2019-05-30 | 菊水化学工業株式会社 | Insect repellent coating composition |
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| JPS6443575A (en) * | 1987-08-11 | 1989-02-15 | Chuo Rika Kogyo Kk | Moisture-proofing composition |
| JPH08197511A (en) * | 1995-01-26 | 1996-08-06 | Sanyo Chem Ind Ltd | Ligneous structure for building material |
| JPH09169879A (en) * | 1995-11-11 | 1997-06-30 | Basf Ag | Aqueous polymer dispersion or formulation, moisture-proof layer and sealing compound comprising the same, coated base and method for preparing this dispersion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6443575A (en) * | 1987-08-11 | 1989-02-15 | Chuo Rika Kogyo Kk | Moisture-proofing composition |
| JPH08197511A (en) * | 1995-01-26 | 1996-08-06 | Sanyo Chem Ind Ltd | Ligneous structure for building material |
| JPH09169879A (en) * | 1995-11-11 | 1997-06-30 | Basf Ag | Aqueous polymer dispersion or formulation, moisture-proof layer and sealing compound comprising the same, coated base and method for preparing this dispersion |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016190433A1 (en) * | 2015-05-27 | 2016-12-01 | 関西ペイント株式会社 | Pest-repellent coating composition and method for repelling pest using same |
| JPWO2016190433A1 (en) * | 2015-05-27 | 2017-06-22 | 関西ペイント株式会社 | Pest repellent coating composition and pest repellent method using the same |
| JP2019069538A (en) * | 2017-10-06 | 2019-05-09 | 有限会社奈良研究所 | Wood article and method for manufacturing the same |
| JP2019081822A (en) * | 2017-10-27 | 2019-05-30 | 菊水化学工業株式会社 | Insect repellent coating composition |
| JP7088660B2 (en) | 2017-10-27 | 2022-06-21 | 菊水化学工業株式会社 | Insect repellent paint composition |
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