JP2010143954A - Aqueous resin dispersion for coating inorganic substrate - Google Patents

Aqueous resin dispersion for coating inorganic substrate Download PDF

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JP2010143954A
JP2010143954A JP2008319378A JP2008319378A JP2010143954A JP 2010143954 A JP2010143954 A JP 2010143954A JP 2008319378 A JP2008319378 A JP 2008319378A JP 2008319378 A JP2008319378 A JP 2008319378A JP 2010143954 A JP2010143954 A JP 2010143954A
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resin dispersion
aqueous resin
acrylonitrile
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ethylenically unsaturated
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JP5219773B2 (en
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Masuya Hirayama
益也 平山
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Shinto Paint Co Ltd
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Shinto Paint Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an aqueous resin dispersion necessary for a novel one-pack coating that is used for a porous inorganic substrate used in building material/construction fields, civil engineering fields and the like, particularly for inorganic building materials such as outer wall materials, roof materials and the like of a prefabricated housing and the like, is excellent in permeability into and adhesion to a substrate and reinforcing effects for the substrate and exhibits excellent dryability and blocking resistance, and a coating of the same. <P>SOLUTION: The coating comprises as an essential ingredient an aqueous resin dispersion obtained by emulsion-polymerizing (1) 10-40 wt.% of acrylonitrile, (2) 30-80 wt.% of an α,β-ethylenically unsaturated monomer other than acrylonitrile giving a homopolymer having a glass transition temperature (Tg) of 50°C or higher and (3) the remainder of other α,β-ethylenically unsaturated monomers, more preferably an aqueous resin dispersion obtained by two-step emulsion polymerization where at least 80 wt.% of acrylonitrile of the total acrylonitrile used in the first and the second steps are polymerized in the second step. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は建材・建築分野、土木分野等で使用される多孔質の無機系基材用の塗装において、塗料に供せられる水性樹脂分散体およびその塗料に関するものである。さらに詳しくは主としてプレハブなどの住宅建築の外壁材あるいは屋根材として使用される、セメントスラグ板、木片セメント板、パルプ繊維セメント板、軽量気泡コンクリート板、珪酸カルシウム板等に好適に塗装使用されるプライマー用水性樹脂分散体およびその塗料に関するものである。   The present invention relates to a water-based resin dispersion used for a paint and a paint for the porous inorganic base material used in the building materials / architecture field, the civil engineering field, and the like. More specifically, it is a primer that is suitably used for cement slag boards, wood cement boards, pulp fiber cement boards, lightweight cellular concrete boards, calcium silicate boards, etc., mainly used as exterior walls or roofing materials for residential buildings such as prefabricated buildings. The present invention relates to a water-based resin dispersion and a paint for the same.

上記の建材・建築分野、土木分野等においては、従来から多孔質の無機系基材が多方面で使用されている。このような多孔質の無機系基材は、内部に多数の気泡を有しており、軽量で取り扱いが良好であることが大きな特徴である。特に住宅建築においては施工性向上で大いに役立っている。また機能的にも断熱性や遮音性が高い等の特徴を有し、外壁材として優れた材料である。しかしながら、多孔質の無機系基材には、内部に多数の気孔が存在するため、実使用においては雨などが材料中へ染み込み易く、耐久性を損なう原因となり改良が求められている。   In the construction materials / architecture field, civil engineering field, and the like, porous inorganic base materials have been used in various fields. Such a porous inorganic base material has a large number of bubbles inside, and is characterized by being light and easy to handle. Especially in residential construction, it is greatly useful for improving workability. In addition, it has the characteristics such as high heat insulation and sound insulation, and is an excellent material as an outer wall material. However, since a porous inorganic base material has a large number of pores therein, rain and the like are likely to permeate into the material in actual use, and there is a need for improvement because it impairs durability.

また上記の無機系基材はカルシウム成分が多量に含まれており、大気中の二酸化炭素が経時的に材料表面から内部に移行して炭酸カルシウムを生じてpHの低下を起こす中性化の問題がある。この問題点は骨材を使用した無機系基材において、pH低下で骨材の不動態膜が破壊され、腐食を引き起こして材料強度を低下させる大きな要因となり、材料の更なる軽量化による強度低下とあいまって、いかに材料強度を確保するかが大きな課題となっている。   In addition, the inorganic base material contains a large amount of calcium component, and the problem of neutralization that causes the carbon dioxide in the atmosphere to move from the surface of the material to the inside over time to produce calcium carbonate and lower the pH. There is. This problem is due to the fact that the passive film of the aggregate is destroyed when the pH is lowered in an inorganic base material using aggregate, which causes a major factor to reduce the material strength by causing corrosion. Along with that, how to secure the material strength is a big issue.

上記課題への対策として、有機溶剤型の塗料の使用が考えられるが、有機溶剤を使用するため、環境面、コスト面から好ましいものではない。一方、水系としては、水分散性のエポキシ樹脂あるいは水分散性のイソシアネートプレポリマーを使用する方法が開示されている(例えば特許文献1、特許文献2、特許文献3)。しかしながらこれらはいずれも基本的に2液型であり、無機系基材への付着性、基材に対する補強効果はある程度達成されるものの、2液を混合する手間、あるいはポットライフによりおのずと使用時間が制限される問題点がある。   As a countermeasure to the above problem, use of an organic solvent type paint is conceivable, but since an organic solvent is used, it is not preferable from the viewpoint of environment and cost. On the other hand, as an aqueous system, a method using a water-dispersible epoxy resin or a water-dispersible isocyanate prepolymer is disclosed (for example, Patent Document 1, Patent Document 2, and Patent Document 3). However, these are basically two-component types, and adhesion to inorganic base materials and reinforcing effects on the base materials can be achieved to some extent, but the use time is naturally due to the trouble of mixing the two solutions or the pot life. There is a limited problem.

また1液型としては、スチレン/(メタ)アクリル酸エステル系エマルジョン、(メタ)アクリル酸エステル系エマルジョン等があるが(例えば特許文献4、特許文献5)、基材への付着性、基材に対する補強効果が未だ不十分である。
特開平11−209567号公報 特開平6−92756号公報 特開2004−10777号公報 特開平10−251590号公報 特開2002−114938号公報
Examples of the one-pack type include styrene / (meth) acrylate emulsions and (meth) acrylate emulsions (for example, Patent Document 4 and Patent Document 5). Reinforcing effect is still insufficient.
JP-A-11-209567 JP-A-6-92756 JP 2004-10777 A JP-A-10-251590 JP 2002-114938 A

このようなことから、建材・建築分野、土木分野等に使用される多孔質の無機系基材、特にプレハブ等の住宅建築の外壁材あるいは屋根材として使用頻度が増加している無機系建材に使用され、基材への浸透性、付着性、基材に対する補強効果において、従来技術にない優れた性能を有する新規な1液型塗料に必要な、水性樹脂分散体およびその塗料を提供することが本発明の課題である。   Because of this, it is a porous inorganic base material used in the building materials / architecture field, civil engineering field, etc., especially inorganic building materials that are increasingly used as outer wall materials or roofing materials for residential buildings such as prefabricated buildings. To provide a water-based resin dispersion and a coating material required for a novel one-component coating material that has excellent performance not used in the prior art in terms of permeability, adhesion to the substrate, and reinforcing effect on the substrate. Is the subject of the present invention.

また無機系建材は、現場において使用されるまでの間、製品が積み上げられるのが通常である。このため積み上げで加重がかかった場合の、材料同士のブロッキングも大きな問題である。特に建材の裏面は、ほとんどの場合シーラーのみが塗装されているので、このことを勘案し、加重がかかってもブロッキングが起こらない、シーラー用水性樹脂分散体およびその塗料を提供することも本発明の課題である。 Moreover, as for an inorganic type building material, it is normal that a product is piled up until it is used on the spot. For this reason, blocking between materials when a load is applied by stacking is also a big problem. In particular, since the back surface of the building material is almost always coated only with a sealer, in consideration of this, it is also possible to provide an aqueous resin dispersion for sealer and its coating material that does not block even when a load is applied. It is a problem.

すなわち本発明は、α、β−エチレン性不飽和単量体量を乳化重合して得られる、多孔質の無機系基材用塗料に供せられる水性樹脂分散体であり、該α、β−エチレン性不飽和単量体量全体の中で、(1)アクリロニトリルが10〜40重量%、(2)単独重合体のTgが50℃以上である、アクリロニトリル以外のα、β−エチレン性不飽和単量体が30〜80重量%、かつ残りの部分は(3)その他のα、β−エチレン性不飽和単量体が共重合された水性樹脂分散体およびその塗料に関している。   That is, the present invention is an aqueous resin dispersion obtained by emulsion polymerization of an α, β-ethylenically unsaturated monomer amount and used for a porous inorganic base material coating, wherein the α, β- Among the total amount of ethylenically unsaturated monomers, (1) 10 to 40% by weight of acrylonitrile, (2) Tg of homopolymer is 50 ° C. or higher, α, β-ethylenically unsaturated other than acrylonitrile The monomer is 30 to 80% by weight, and the remaining part relates to (3) an aqueous resin dispersion in which other α, β-ethylenically unsaturated monomers are copolymerized and a coating thereof.

さらには上記の水性樹脂分散体が、α、β−エチレン性不飽和単量体量をニ段階に分割使用し、かつそれぞれの単量体を乳化重合して得られる水性樹脂分散体であり、一段目に続く二段目の重合反応において、一段目および二段目に使用する全アクリロニトリルのうち、少なくとも80重量%以上を二段目に使用することを特徴とする水性樹脂分散体およびその塗料に関している。   Furthermore, the above-mentioned aqueous resin dispersion is an aqueous resin dispersion obtained by dividing and using the amount of α, β-ethylenically unsaturated monomer in two stages, and emulsion polymerization of each monomer, In the second stage polymerization reaction following the first stage, out of all acrylonitrile used in the first stage and the second stage, at least 80% by weight or more is used in the second stage, and an aqueous resin dispersion and its coating material It is related.

本発明の水性樹脂分散体は、多孔質の無機系基材、特に住宅建築に使用されるセメントスラグ板、木片セメント板、パルプ繊維セメント板、軽量気泡コンクリート板、珪酸カルシウム板等の無機系建材の塗料用途に好適に使用され、1液型でかつ従来技術にない優れた基材への浸透性、付着性、基材に対する補強効果を発揮させることができる。また乾燥性にも優れ、使用されるまでの間の建材の積み上げ時、特に夏場の高温多湿時においても、優れた耐ブロッキング性を発揮し、材同士のブロッキングで良好な外観が損なわれて製品材を無駄に損失することがない。   The aqueous resin dispersion of the present invention is an inorganic base material such as a porous inorganic base material, particularly cement slag board, wood chip cement board, pulp fiber cement board, lightweight cellular concrete board, calcium silicate board, etc. It can be suitably used for coating applications, and can exhibit excellent permeability to a substrate, adhesion, and a reinforcing effect on the substrate, which are one-pack type and not available in the prior art. It also has excellent drying properties, and exhibits excellent blocking resistance when building materials are stacked before use, especially during high temperatures and high humidity in the summer, and good appearance is impaired due to blocking between materials. There is no loss of material.

本発明について以下に具体的に説明する。
[1]水性樹脂分散体の単量体組成について
本発明の水性樹脂分散体については、アクリロニトリルがα、β−エチレン性不飽和単量体全体の中で10〜40重量%使用されるのが特徴である。このためニトリル基の強い凝集力により、本発明の水性樹脂分散体は従来の水性樹脂分散体では得られない、十分な基材への付着性、基材に対する補強効果を有している。アクリロニトリル量が10重量%未満では、十分な凝集力がえられず、40重量%を超えると安定な水性樹脂分散液が得られにくい。また二段重合法で本発明の水性樹脂分散体を製造する場合は、一段目および二段目重合に使用する全アクリロニトリルのうち、少なくとも80重量%以上を二段目重合に使用することで、上記のアクリロニトリルの効果をなお一層有効に機能させることができる。
The present invention will be specifically described below.
[1] Monomer composition of aqueous resin dispersion In the aqueous resin dispersion of the present invention, acrylonitrile is used in an amount of 10 to 40% by weight in the entire α, β-ethylenically unsaturated monomer. It is a feature. For this reason, due to the strong cohesive strength of the nitrile group, the aqueous resin dispersion of the present invention has sufficient adhesion to the base material and a reinforcing effect on the base material, which cannot be obtained with conventional aqueous resin dispersions. If the amount of acrylonitrile is less than 10% by weight, sufficient cohesive force cannot be obtained, and if it exceeds 40% by weight, a stable aqueous resin dispersion is difficult to obtain. When the aqueous resin dispersion of the present invention is produced by a two-stage polymerization method, by using at least 80% by weight or more of the total acrylonitrile used for the first and second stage polymerizations in the second stage polymerization, The effect of the above acrylonitrile can be made to function even more effectively.

また(2)単独重合体のTgが50℃以上である、アクリロニトリル以外のα、β−エチレン性不飽和単量体については、アクリロニトリルも含めて、本発明の水性樹脂分散体に硬さを付与するための成分である。この単量体がα、β−エチレン性不飽和単量体全体の中で、30〜80重量%使用されることで、塗装後の基材の積み上げ時、特に夏場の高温多湿時においても、優れた耐ブロッキング性を発揮させることができ、材同士のブロッキングで製品材を無駄に損失することがない。上記範囲外では性能は不十分である。また(2)の単量体のより好ましい範囲は35〜80重量%であり、さらに好ましい範囲は40〜80重量%ある。   (2) For α, β-ethylenically unsaturated monomers other than acrylonitrile having a Tg of 50 ° C. or higher, the hardness of the aqueous resin dispersion of the present invention, including acrylonitrile, is imparted. It is a component to do. By using 30 to 80% by weight of this monomer in the entire α, β-ethylenically unsaturated monomer, it is possible to stack the base material after coating, particularly in the hot and humid summer. Excellent blocking resistance can be exhibited, and the product material is not lost in vain due to blocking between materials. Outside the above range, the performance is insufficient. Moreover, the more preferable range of the monomer of (2) is 35 to 80% by weight, and a more preferable range is 40 to 80% by weight.

また二段重合法で本発明の水性樹脂分散体を製造する場合は、(2)の単量体については一段目および二段目の全体量の10〜40%を二段目に重合するのがより好ましい。
単独重合体のTgが50℃以上である、アクリロニトリル以外のα、β−エチレン性不飽和単量体としては、スチレン、α−メチルスチレン、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸イソプロピル、メタクリル酸イソブチル、メタクリル酸tert−ブチル、メタクリル酸シクロヘキシル、メタクリル酸2−エチルへキシル等が挙げられる。
When the aqueous resin dispersion of the present invention is produced by the two-stage polymerization method, 10 to 40% of the total amount of the first and second stages is polymerized in the second stage for the monomer (2). Is more preferable.
Examples of α, β-ethylenically unsaturated monomers other than acrylonitrile whose Tg of the homopolymer is 50 ° C. or higher include styrene, α-methylstyrene, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, methacrylic acid Examples include isobutyl, tert-butyl methacrylate, cyclohexyl methacrylate, and 2-ethylhexyl methacrylate.

さらに(3)その他のα、β−エチレン性不飽和単量体は、(1)アクリロニトリル、および(2)単独重合体のTgが50℃以上である、アクリロニトリル以外のα、β−エチレン性不飽和単量体以外の残りの部分であり、本発明の水性樹脂分散体にアクリロニトリルあるいは(2)の単量体では付与できない性能面を付与するために使用される。例えばアクリル酸メチル、アクリル酸エチル、アクリル酸プロピル、アクリル酸イソプロピル、アクリル酸ブチル、アクリル酸イソブチル、アクリル酸sec−ブチル、アクリル酸tert−ブチル、アクリル酸2−エチルへキシル、メタクリル酸ブチル、メタクリル酸へキシル、メタクリル酸ラウリル等は適度の柔軟性を付与する成分であり、アクリル酸2−ヒドロキシエチル、メタアクリル酸2−ヒドロキシエチル、アクリル酸2−ヒドロキシプロピル、メタクリル酸2−ヒドロキシプロピル、メタクリル酸グリシジル等は親水性あるいは官能性を付与する成分であり、アクリル酸、メタクリル酸等は水性樹脂分散体に高い分散安定性を付与する成分である。       Furthermore, (3) other α, β-ethylenically unsaturated monomers are (1) acrylonitrile and (2) α, β-ethylenically unsaturated monomers other than acrylonitrile, wherein the Tg of the homopolymer is 50 ° C. or higher. It is the remaining part other than the saturated monomer, and is used for imparting performance aspects that cannot be imparted to the aqueous resin dispersion of the present invention with acrylonitrile or the monomer (2). For example, methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, isobutyl acrylate, sec-butyl acrylate, tert-butyl acrylate, 2-ethylhexyl acrylate, butyl methacrylate, methacryl Acid hexyl, lauryl methacrylate and the like are components that impart moderate flexibility, such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, methacryl Glycidyl acid is a component that imparts hydrophilicity or functionality, and acrylic acid, methacrylic acid, and the like are components that impart high dispersion stability to an aqueous resin dispersion.

[2]水性樹脂分散体の重合方法(乳化重合)について
本発明の水性樹脂分散体は、乳化重合法を用いて一段重合により合成することができる。しかし、α、β−エチレン性不飽和単量体量を2つのグループに分割し、かつそれぞれの単量体混合物を乳化重合する二段重合がより好ましく、中でも一段目に続く二段目の重合反応において、一段目および二段目に使用する全アクリロニトリルのうち少なくとも80重量%を二段目に使用して乳化重合する二段重合がさらに好ましい。一段目と二段目の単量体の割合は、全単量体に対して一段目の単量体が30〜70重量%、二段目の単量体が70〜30重量%が好ましい。さらには一段目40〜60重量%、二段目60〜40重量%がより好ましい。また二段目の重合反応においては、一段目の重合反応の反応率が80%以上になった時点で開始するのが好ましい。
[2] Polymerization method (emulsion polymerization) of aqueous resin dispersion The aqueous resin dispersion of the present invention can be synthesized by one-step polymerization using an emulsion polymerization method. However, two-stage polymerization in which the amount of α, β-ethylenically unsaturated monomer is divided into two groups and each monomer mixture is emulsion-polymerized is more preferable. In the reaction, a two-stage polymerization in which at least 80% by weight of all acrylonitrile used in the first and second stages is used in the second stage for emulsion polymerization is more preferable. The ratio of the first and second stage monomers is preferably 30 to 70% by weight for the first stage monomer and 70 to 30% by weight for the second stage monomer with respect to the total monomers. More preferably, the first stage is 40 to 60% by weight and the second stage is 60 to 40% by weight. The second stage polymerization reaction is preferably started when the reaction rate of the first stage polymerization reaction reaches 80% or more.

本発明の水性樹脂分散体を製造するに際して、陰イオン性の界面活性剤あるいはノニオン性の界面活性剤を使用するが併用してもかまわない。陰イオン性の界面活性剤を例示すると、ラウリル硫酸ナトリウム、アンモニウムのような高級アルキル硫酸のアルカリ塩、ドデシルベンゼンスルホン酸、イソプロピルベンゼンスルホン酸のナトリウム、アンモニウムのようなアルキルアリールスルホン酸のアルカリ塩、イソプロピルナフタレンスルホン酸、ノニルナフタレンスルホン酸、ジノニルナフタレンスルホン酸のナトリウム、アンモニウムのようなアルキルナフタレンスルホン酸のアルカリ塩、ノニルフェノールのポリエトキシエタノール硫酸ナトリウム、アンモニウムのようなアルキルアリールポリエトキシエタノール硫酸または同スルホン酸のアルカリ塩、ポリオキシエチレンラウリルエーテル硫酸エステルまたは同スルホン酸のナトリウム、アンモニウム塩、さらには親水性−疎水性のバランスを有するカルボキシル基含有共重合体のアルカリ塩等が挙げられる。   In producing the aqueous resin dispersion of the present invention, an anionic surfactant or a nonionic surfactant is used, but may be used in combination. Examples of anionic surfactants include sodium lauryl sulfate, alkali salts of higher alkyl sulfates such as ammonium, dodecylbenzenesulfonic acid, sodium isopropylbenzenesulfonic acid, alkali salts of alkylarylsulfonic acid such as ammonium, Isopropylnaphthalenesulfonic acid, nonylnaphthalenesulfonic acid, sodium dinonylnaphthalenesulfonic acid, alkali salts of alkylnaphthalenesulfonic acid such as ammonium, nonylphenol sodium polyethoxyethanol sulfate, alkylaryl polyethoxyethanol sulfate such as ammonium or the like Alkaline salt of sulfonic acid, polyoxyethylene lauryl ether sulfate or sodium, ammonium salt of sulfonic acid, and hydrophilic Alkali salt of the carboxyl group-containing copolymer having a balance of hydrophobicity and the like.

またノニオン性の界面活性剤を例示すると、ポリオキシエチレンオレイルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンラウリルエーテルのようなポリオキシエチンアルキルエーテル類、ポリオキシエチレンノニルフェニルエーテル、ポリオキシエチレンオクチルフェニルエーテル、ポリオキシエチレンモノラウレート、ポリオキシエチレンモノステアレート、ポリオキシエチレンモノオレエートのようなポリオキシエチレン誘導体類、ソルビタンモノラウレート、ソルビタンモノステアレート、ソルビタントリオレエート、ポリオキシエチレンソルビタンモノラウレートのようなソルビタン脂肪酸エステル類、ポリオキシエチレンソルビタン脂肪酸エステル類、ポリオキシエチレンとポリオキシプロピレンがブロック共重合したいわゆるプルロニックタイプ、その他ポリオキシエチレンアルキルアミン類、アルキルアルカノールアミド類等が挙げられる。   Examples of nonionic surfactants include polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxyethyne alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl. Ether, polyoxyethylene monolaurate, polyoxyethylene monostearate, polyoxyethylene derivatives such as polyoxyethylene monooleate, sorbitan monolaurate, sorbitan monostearate, sorbitan trioleate, polyoxyethylene sorbitan mono Sorbitan fatty acid esters such as laurate, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene and polyoxypropylene Click copolymerized so-called pluronic types, other polyoxyethylene alkyl amines, alkyl alkanol amides, and the like.

さらに本発明に使用する界面活性剤としては、エチレン性不飽和結合を有する、いわゆる反応性乳化剤が好ましく、このような界面活性剤を用いることにより、フリーの非反応性の界面活性剤による耐水性の低下を抑制することが可能である。上記反応性乳化剤としては、ラテムルPD−104(花王株式会社製)、アクアロンKH−05、アクアロンKH−10(第一工業製薬株式会社製)、ANTOX MS−60(日本乳化剤株式会社製)、エレミノールJS−20(三洋化成株式会社製)等を挙げることができる。なかでも、乳化重合において重合反応性の高いアクアロンKH−05やアクアロンKH−10が特に好ましい。これらは、二種類以上併用してもよい。
上記界面活性剤量は、全単量体100重量部に対して0.5〜5重量%が好ましい。これより少ないと、粒子の安定性が十分に確保できず、これより多いと耐水性が十分でない。
Further, as the surfactant used in the present invention, a so-called reactive emulsifier having an ethylenically unsaturated bond is preferable. By using such a surfactant, water resistance due to a free non-reactive surfactant is obtained. Can be suppressed. As the reactive emulsifier, Latemul PD-104 (manufactured by Kao Corporation), Aqualon KH-05, Aqualon KH-10 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), ANTOX MS-60 (manufactured by Nippon Emulsifier Co., Ltd.), Eleminol And JS-20 (manufactured by Sanyo Chemical Co., Ltd.). Of these, Aqualon KH-05 and Aqualon KH-10, which have high polymerization reactivity in emulsion polymerization, are particularly preferable. Two or more of these may be used in combination.
The amount of the surfactant is preferably 0.5 to 5% by weight with respect to 100 parts by weight of all monomers. If it is less than this, the stability of the particles cannot be sufficiently secured, and if it is more than this, the water resistance is not sufficient.

重合開始剤としては、過硫酸ナトリウム、過硫酸カリウム、過硫酸アンモニウムなどの無機過酸化物開始剤や、レドックス系開始剤、例えば、t−ブチルヒドロペルオキシド、クメンヒドロペルオキシドなどの有機過酸化物開始剤、あるいは上記の無機過酸化物開始剤に、過酸化水素、チオ硫酸ナトリウム、ロンガリットなどの無機還元剤などを組み合わせて使用することもできる。全単量体100重量部に対し開始剤量は0.1〜3重量%、好ましくは0.3〜2重量%である。この範囲よりも少ないと、未反応単量体が増える傾向にあり、また、多いと分子量が低くなり目的の塗膜性能が得られにくい傾向にある。
反応温度は加温状態で行われるのが好ましく、通常40〜100℃である。しかしレドックス系開始剤の場合は室温でも十分実施が可能である。
Examples of the polymerization initiator include inorganic peroxide initiators such as sodium persulfate, potassium persulfate, and ammonium persulfate, and redox initiators such as organic peroxide initiators such as t-butyl hydroperoxide and cumene hydroperoxide. Alternatively, an inorganic reducing agent such as hydrogen peroxide, sodium thiosulfate, or Rongalite may be used in combination with the above inorganic peroxide initiator. The amount of the initiator is 0.1 to 3% by weight, preferably 0.3 to 2% by weight, based on 100 parts by weight of all monomers. If the amount is less than this range, the amount of unreacted monomers tends to increase. If the amount is more than this range, the molecular weight tends to be low, and the desired film performance tends to be difficult to obtain.
The reaction temperature is preferably carried out in a warmed state, and is usually 40 to 100 ° C. However, redox initiators can be satisfactorily carried out even at room temperature.

乳化重合により得られる、本発明の水性樹脂分散体の平均粒径は、一段重合法、二段重合法にかかわらず、50〜200nmが好ましく、さらには60〜120nmが好ましい。粒径が上記の範囲より大きい場合には、水性樹脂分散体または塗料の造膜性が低下し膜の緻密性が損なわれ、さらには、顔料粒子との混和性が低下することにより、基材との密着性および耐水性が低下する傾向があるので好ましくない。   The average particle size of the aqueous resin dispersion of the present invention obtained by emulsion polymerization is preferably 50 to 200 nm, more preferably 60 to 120 nm, regardless of the one-stage polymerization method or the two-stage polymerization method. When the particle size is larger than the above range, the film-forming property of the aqueous resin dispersion or paint is lowered, the denseness of the film is impaired, and further, the miscibility with the pigment particles is lowered. The adhesion and water resistance tend to decrease, which is not preferable.

[3]塗料の作製
本発明の水性樹脂分散体は、そのままクリヤー塗料として使用することができるが、必要に応じて顔料、増粘剤、表面調整剤、溶剤等を配合して塗料化することができる。
ここで、顔料としては、特に制限はなく、各種の天然顔料、合成無機顔料および合成有機顔料を使用することができる。さらに、具体的には、着色顔料(チタン白、鉄黄、群青、ベンガラ、クロムイエロー、カーボンブラック、シアニン系顔料、アゾ系顔料、トリフェニルメタン系顔料、キノリン系顔料、アントラキノン系顔料、フタロシアニン系顔料など)、体質顔料(硫酸バリウム、炭酸カルシウム、カオリン、タルク、シリカ、アルミナ、パーライト、硅砂など)、特殊顔料(錆止め顔料、発光顔料、示温顔料など)、繊維状またはリン片状の特殊無機顔料(ロックウール、マイカなど)などが挙げられ、これらの顔料は単独で用いても良く、また二種以上を組み合わせて用いても良い。上記顔料の配合量は特に制限はない。
[3] Preparation of paint The aqueous resin dispersion of the present invention can be used as it is as a clear paint, but if necessary, a pigment, a thickener, a surface conditioner, a solvent, etc. may be blended into a paint. Can do.
Here, the pigment is not particularly limited, and various natural pigments, synthetic inorganic pigments, and synthetic organic pigments can be used. Furthermore, specifically, coloring pigments (titanium white, iron yellow, ultramarine blue, bengara, chrome yellow, carbon black, cyanine pigments, azo pigments, triphenylmethane pigments, quinoline pigments, anthraquinone pigments, phthalocyanine pigments. Pigments), extender pigments (barium sulfate, calcium carbonate, kaolin, talc, silica, alumina, perlite, silica sand, etc.), special pigments (rust-preventing pigments, luminescent pigments, temperature pigments, etc.), fibrous or flake shaped special inorganics Pigments (rock wool, mica, etc.) can be mentioned, and these pigments may be used alone or in combination of two or more. The blending amount of the pigment is not particularly limited.

増粘剤としてはウレタン変性ポリエーテルなどの会合性増粘剤、メチルセルロース、カルボキシメチルセルロース、ポリビニルアルコール、ポリアクリル酸塩、ポリアクリルアミド、ポリビニルピロリドンなどの高分子系増粘剤が使用できる。塗料を作製する際には、樹脂の性能を損なわない範囲で増粘剤を添加することができる。   As the thickener, an associative thickener such as urethane-modified polyether, or a polymeric thickener such as methylcellulose, carboxymethylcellulose, polyvinyl alcohol, polyacrylate, polyacrylamide, or polyvinylpyrrolidone can be used. When producing a paint, a thickener can be added within a range that does not impair the performance of the resin.

表面調整剤としてはポリエーテル変性ポリシロキサン、アクリル系共重合物、アルコールアルコキシレートなどが挙げられる。塗料を多孔質の無機系基材にスポンジロールコーターなどで塗装する際に、塗料をスポンジロールで基材に押さえつけることにより、基材の細孔の空気が塗膜中に含まれて乾燥したのちに穴となり、塗膜に欠陥ができシール性が損なわれて耐水性が低下する。これを防ぐため、塗膜中にできた泡を消すために、塗膜の表面張力を下げる目的で表面調整剤を添加することができる。また消泡剤も同じ目的で添加することができる。消泡剤については、例えば変性シリコーン系、シリカシリコーン系、鉱物油系などが挙げられる。   Examples of the surface conditioner include polyether-modified polysiloxane, acrylic copolymer, alcohol alkoxylate and the like. When a paint is applied to a porous inorganic base material with a sponge roll coater, etc., the paint is pressed against the base material with a sponge roll, so that the air in the pores of the base material is contained in the coating and dried. As a result, the coating film becomes defective, the sealing performance is impaired, and the water resistance decreases. In order to prevent this, a surface conditioner can be added for the purpose of reducing the surface tension of the coating film in order to eliminate bubbles formed in the coating film. An antifoaming agent can also be added for the same purpose. Examples of antifoaming agents include modified silicones, silica silicones, and mineral oils.

溶剤としては、例えば、油性溶剤(ベンジルアルコール、テキサノール、ジブチルアジペートなど)、水性溶剤(メチルセロソルブ、エチルセロソルブ、プロピルセロソルブ、ブチルセロソルブ、プロピレングリコールモノメチルエーテル、プロピレングリコールモノブチルエーテル、ブチルジグリコール、プロピレングリコールモノメチルエーテルアセテート等)を本発明の水性樹脂分散体の低温造膜性を確保するために添加することができる。     Examples of the solvent include oil-based solvents (benzyl alcohol, texanol, dibutyl adipate, etc.), aqueous solvents (methyl cellosolve, ethyl cellosolve, propyl cellosolve, butyl cellosolve, propylene glycol monomethyl ether, propylene glycol monobutyl ether, butyl diglycol, propylene glycol monomethyl Ether acetate etc.) can be added in order to ensure the low-temperature film-forming property of the aqueous resin dispersion of the present invention.

[4]多孔質の無機系基材
本発明の水性樹脂分散体から得られる塗料は、建材・建築分野、土木分野等で使用される多孔質の無機系基材、特に住宅建築に使用されるセメントスラグ板、木片セメント板、パルプ繊維セメント板、軽量気泡コンクリート板、珪酸カルシウム板等に塗装し使用することができる。
[4] Porous inorganic base material The paint obtained from the aqueous resin dispersion of the present invention is used for a porous inorganic base material used in the building materials / architecture field, civil engineering field, etc., particularly in residential construction. It can be used by coating on cement slag board, wood chip cement board, pulp fiber cement board, lightweight cellular concrete board, calcium silicate board and the like.

[5]塗装方法
塗料を基材に塗布するための方法は特に限定されるものではなく、例えば、刷毛、へら、エアスプレー、エアレススプレー、ロールコーター、バーコーター、カーテンフローコーター、モルタルガン、リシンガン等を用いることができる。特に、ロールコーターが、住宅建築に使用される基材の平面部分を連続に塗装して大量生産でき、かつ、塗料の無駄を少なくできることから適している。
[5] Coating method The method for applying the paint to the substrate is not particularly limited. For example, brush, spatula, air spray, airless spray, roll coater, bar coater, curtain flow coater, mortar gun, lysing gun Etc. can be used. In particular, the roll coater is suitable because it can be mass-produced by continuously painting a flat portion of a base material used in residential construction, and waste of paint can be reduced.

以下、実施例および比較例を示して本発明をより具体的に説明するが、本発明はこれらにより制限されるものではない。なお以下において特に説明がない場合、部は重量部を表す。   EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated more concretely, this invention is not restrict | limited by these. In the following description, parts represent parts by weight unless otherwise specified.

製造例1(実施例1用)
温度計、撹拌機、環流冷却管、窒素導入管および滴下ロートを備えたガラス製反応容器に、(1)イオン交換水80部、(2)アクアロンKH−10(反応性アニオン乳化剤、ポリオキシエチレン−1−(アリルオキシメチル)アルキルエーテル硫酸エステルアンモニウム塩、第一工業製薬株式会社製)0.3部を仕込んで溶解し、系内を窒素ガスで置換しながら、75℃まで昇温した。次いで、(3)過硫酸アンモニウム0.1部を仕込んで10分間保持した。次いで(4)スチレン45部、(5)アクリロニトリル35部、(6)アクリル酸2−エチルへキシル18部、(8)アクリル酸2部、(9)イオン交換水40部、(10)アクアロンKH−10 2部、(11)ハイテノールNF−08(ポリオキシエチレンスチリルフェニル硫酸エステルアンモニウム塩およびポリオキシスチリルフェニルエーテルの混合物、第一工業製薬株式会社製)0.6部を予め混合した単量体プレ乳化液を4時間かけて滴下した。同時に、重合開始剤として(20)イオン交換水20部に(21)過硫酸アンモニウム1部を溶解したものを5時間かけて滴下した。滴下終了後、1時間熟成した後、冷却し、(22)アンモニア水2部を添加して水性樹脂分散体を得た。得られた水性樹脂分散体の不揮発分は41.5%、粘度は30mPa・s、pHは8.5であった。
Production Example 1 (for Example 1)
In a glass reaction vessel equipped with a thermometer, stirrer, reflux condenser, nitrogen inlet tube and dropping funnel, (1) 80 parts of ion exchange water, (2) Aqualon KH-10 (reactive anion emulsifier, polyoxyethylene) First, 0.3 part of -1- (allyloxymethyl) alkyl ether sulfate ester ammonium salt (Daiichi Kogyo Seiyaku Co., Ltd.) was charged and dissolved, and the temperature was raised to 75 ° C. while replacing the system with nitrogen gas. Next, (3) 0.1 part of ammonium persulfate was charged and held for 10 minutes. (4) Styrene 45 parts, (5) Acrylonitrile 35 parts, (6) 2-ethylhexyl acrylate 18 parts, (8) Acrylic acid 2 parts, (9) Ion-exchanged water 40 parts, (10) Aqualon KH -10 2 parts, (11) Hytenol NF-08 (polyoxyethylene styryl phenyl sulfate ammonium salt and polyoxystyryl phenyl ether mixture, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 0.6 parts previously mixed The body pre-emulsion was added dropwise over 4 hours. At the same time, as a polymerization initiator, (20) 20 parts of ion-exchanged water and (21) 1 part of ammonium persulfate dissolved therein were added dropwise over 5 hours. After completion of dropping, the mixture was aged for 1 hour, then cooled, and (22) 2 parts of ammonia water was added to obtain an aqueous resin dispersion. The obtained aqueous resin dispersion had a non-volatile content of 41.5%, a viscosity of 30 mPa · s, and a pH of 8.5.

製造例2(実施例2用)
温度計、撹拌機、環流冷却管、窒素導入管および滴下ロートを備えたガラス製反応容器に(1)イオン交換水80部、(2)アクアロンKH−10(反応性アニオン乳化剤、ポリオキシエチレン−1−(アリルオキシメチル)アルキルエーテル硫酸エステルアンモニウム塩、第一工業製薬株式会社製)0.3部を仕込んで溶解し、系内を窒素ガスで置換しながら、75℃まで昇温した。次いで、(3)過硫酸アンモニウム0.1部を仕込んで10分間保持した。次いで、(4)スチレン49部、(8)アクリル酸1部、(9)イオン交換水20部、(10)アクアロンKH−10 1部、(11)ハイテノールNF−08(ポリオキシエチレンスチリルフェニル硫酸エステルアンモニウム塩およびポリオキシスチリルフェニルエーテルの混合物、第一工業製薬株式会社製)0.3部を予め混合した一段目単量体プレ乳化液を2時間かけて滴下した後、(12)スチレン18部、(13)アクリロニトリル15部、(14)アクリル酸2−エチルへキシル16部、(16)アクリル酸1部、(17)イオン交換水20部、(18)アクアロンKH−10 1部、(19)ハイテノールNF−08 0.3部を予め混合した二段目単量体プレ乳化液を2時間かけて滴下した。また重合開始剤としては(20)イオン交換水20部に(21)過硫酸アンモニウム1部を溶解したものを、一段目単量体プレ乳化液と同時に滴下を開始し5時間かけて滴下した。滴下終了後、1時間熟成した後、冷却し、(22)アンモニア水2部を添加して水性樹脂分散体を得た。得られた水性樹脂分散体の不揮発分は41.7%、粘度は55mPa・s、pHは8.5であった。
Production Example 2 (for Example 2)
In a glass reaction vessel equipped with a thermometer, stirrer, reflux condenser, nitrogen inlet tube and dropping funnel, (1) 80 parts of ion exchange water, (2) Aqualon KH-10 (reactive anion emulsifier, polyoxyethylene- 0.3 parts of 1- (allyloxymethyl) alkyl ether sulfate ammonium salt (Daiichi Kogyo Seiyaku Co., Ltd.) was charged and dissolved, and the temperature was raised to 75 ° C. while replacing the system with nitrogen gas. Next, (3) 0.1 part of ammonium persulfate was charged and held for 10 minutes. (4) 49 parts of styrene, (8) 1 part of acrylic acid, (9) 20 parts of ion-exchanged water, (10) 1 part of Aqualon KH-10, (11) Hytenol NF-08 (polyoxyethylene styrylphenyl) (12) Styrene after dropwise addition of a first-stage monomer pre-emulsion solution in which 0.3 part of a mixture of ammonium sulfate and polyoxystyryl phenyl ether (Daiichi Kogyo Seiyaku Co., Ltd.) was mixed in advance over 2 hours. 18 parts, (13) acrylonitrile 15 parts, (14) 2-ethylhexyl acrylate 16 parts, (16) acrylic acid 1 part, (17) ion-exchanged water 20 parts, (18) Aqualon KH-10 1 part, (19) A second-stage monomer pre-emulsion solution in which 0.3 part of Hightenol NF-08 was mixed in advance was added dropwise over 2 hours. Further, as a polymerization initiator, (20) 20 parts of ion-exchanged water and (21) 1 part of ammonium persulfate dissolved therein were added dropwise at the same time as the first-stage monomer pre-emulsified solution and dropped over 5 hours. After completion of dropping, the mixture was aged for 1 hour, then cooled, and (22) 2 parts of ammonia water was added to obtain an aqueous resin dispersion. The obtained aqueous resin dispersion had a nonvolatile content of 41.7%, a viscosity of 55 mPa · s, and a pH of 8.5.

製造例3(実施例3用)
製造例2で用いた二段目使用の単量体のうち(12)スチレン18部、(14)アクリル酸2−エチルへキシル16部を、(12)スチレン23部、(14)アクリル酸2−エチルへキシル11部に変更した以外は、製造例2と同様の操作で水性樹脂分散体を得た。得られた水性樹脂分散体の不揮発分は41.5%、粘度は40mPa・s、pHは8.5であった。
Production Example 3 (for Example 3)
Of the monomers used in the second stage used in Production Example 2, (12) 18 parts of styrene, (14) 16 parts of 2-ethylhexyl acrylate, (12) 23 parts of styrene, (14) acrylic acid 2 -An aqueous resin dispersion was obtained in the same manner as in Production Example 2, except that the amount was changed to 11 parts of ethylhexyl. The obtained aqueous resin dispersion had a non-volatile content of 41.5%, a viscosity of 40 mPa · s, and a pH of 8.5.

製造例4(実施例4用)
製造例2で用いた二段目使用の単量体のうち(12)スチレン18部、(14)アクリル酸2−エチルへキシル16部を、(12)スチレン27部、(14)アクリル酸2−エチルへキシル7部に変更した以外は、製造例2と同様の操作で水性樹脂分散体を得た。得られた水性樹脂分散体の不揮発分は41.5%、粘度は37mPa・s、pHは8.5であった。
Production Example 4 (for Example 4)
Of the monomers used in the second stage used in Production Example 2, (12) 18 parts of styrene, (14) 16 parts of 2-ethylhexyl acrylate, (12) 27 parts of styrene, (14) acrylic acid 2 -An aqueous resin dispersion was obtained in the same manner as in Production Example 2, except that the content was changed to 7 parts of ethylhexyl. The obtained aqueous resin dispersion had a non-volatile content of 41.5%, a viscosity of 37 mPa · s, and a pH of 8.5.

製造例5(比較例1用)
製造例1で用いた単量体(5)アクリロニトリル35部を、(7)メタクリル酸メチル35部に変更した以外は、製造例1と同様の操作で水性樹脂分散体を得た。得られた水性樹脂分散体の不揮発分は41.4%、粘度は30mPa・s、pHは8.5であった。
Production Example 5 (for Comparative Example 1)
An aqueous resin dispersion was obtained in the same manner as in Production Example 1, except that 35 parts of monomer (5) acrylonitrile used in Production Example 1 was changed to 35 parts of (7) methyl methacrylate. The obtained aqueous resin dispersion had a non-volatile content of 41.4%, a viscosity of 30 mPa · s, and a pH of 8.5.

製造例6(比較例2用)
製造例2で用いた二段目使用の単量体のうち(12)スチレン18部、(13)アクリロニトリル15部、(14)アクリル酸2−エチルへキシル16部を、(12)スチレン23部、(14)アクリル酸2−エチルヘキシル11部、(15)メタクリル酸メチル15部に変更した以外は、製造例2と同様の操作で水性樹脂分散体を得た。得られた水性樹脂分散体の不揮発分は41.3%、粘度は39mPa・s、pHは8.5であった。
Production Example 6 (for Comparative Example 2)
Of the monomers used in the second stage used in Production Example 2, (12) 18 parts of styrene, (13) 15 parts of acrylonitrile, (14) 16 parts of 2-ethylhexyl acrylate, (12) 23 parts of styrene (14) An aqueous resin dispersion was obtained in the same manner as in Production Example 2, except that the content was changed to 11 parts of 2-ethylhexyl acrylate and (15) 15 parts of methyl methacrylate. The obtained aqueous resin dispersion had a non-volatile content of 41.3%, a viscosity of 39 mPa · s, and a pH of 8.5.

製造例7(比較例3用)
製造例1で用いた単量体(4)スチレン45部、(5)アクリロニトリル35部、(6)アクリル酸2−エチルヘキシル18部を、(4)スチレン5部、(5)アクリロニトリル8部、(6)アクリル酸2−エチルヘキシル62部、(7)メタクリル酸メチル23部に変更した以外は、製造例1と同様の操作で水性樹脂分散体を得た。得られた水性樹脂分散体の不揮発分は41.5%、粘度は90mPa・s、pHは8.5であった。
Production Example 7 (for Comparative Example 3)
Monomer used in Production Example 1 (4) 45 parts of styrene, (5) 35 parts of acrylonitrile, (6) 18 parts of 2-ethylhexyl acrylate, (4) 5 parts of styrene, (5) 8 parts of acrylonitrile, 6) An aqueous resin dispersion was obtained in the same manner as in Production Example 1, except that the content was changed to 62 parts of 2-ethylhexyl acrylate and (7) 23 parts of methyl methacrylate. The obtained aqueous resin dispersion had a non-volatile content of 41.5%, a viscosity of 90 mPa · s, and a pH of 8.5.

表1に本発明および比較例用の水性樹脂分散体の製造例の原料使用量および分析値を示した。   Table 1 shows the amounts of raw materials used and the analytical values of the production examples of the aqueous resin dispersions for the present invention and comparative examples.

Figure 2010143954
Figure 2010143954

(塗料の作製方法)
イオン交換水12部に、ナトロゾール250MR( 増粘剤、ヒドロキシエチルセルロース ハーキュレス株式会社製)0.1部、25%アンモニア水0.05部、ノプコスパース44C(分散剤、ポリカルボン酸ナトリウム サンノプコ株式会社製)0.1部、SNデフォーマー1316( 消泡剤、ポリエチレングリコール型非イオン界面活性剤とシリコーン系化合物の混合物、サンノプコ株式会社製)0.05部を仕込み、攪拌混合した。次いで、攪拌しながらスーパーSS(体質顔料、重質炭酸カルシウム、丸尾カルシウム株式会社製)22部を少量ずつ加えてプレミックスを作製した。これをビーズ分散法により顔料の粒径が15μm以下になるまで細分化して、これをミルベースとした。
(Preparation method of paint)
12 parts of ion-exchanged water, 0.1 part of Natrozole 250MR (thickener, hydroxyethylcellulose Hercules Co., Ltd.) 0.1 part, 0.05% 25% aqueous ammonia, Nop Cosperth 44C (dispersing agent, sodium polycarboxylate Sannopco Co., Ltd.) 0.1 part and SN deformer 1316 (antifoaming agent, polyethylene glycol type nonionic surfactant and silicone compound mixture, manufactured by San Nopco Co., Ltd.) 0.05 part were charged and mixed with stirring. Next, 22 parts of Super SS (extreme pigment, heavy calcium carbonate, manufactured by Maruo Calcium Co., Ltd.) was added little by little with stirring to prepare a premix. This was finely divided by a bead dispersion method until the particle size of the pigment became 15 μm or less, and this was used as a mill base.

各製造例で得られた水性樹脂分散体50部に、攪拌しながらブチルセロソルブ3.6部、プロピレングリコールモノメチルエーテル3.6部を仕込んだ。次いで、ノプコートPEM−17(離型剤、酸化型ポリエチレンの乳化物、サンノプコ株式会社製)0.3部、SNシックナー623N( 増粘剤、変性ウレタンポリマー、高沸点アルコール系溶剤、水等の混合物、サンノプコ株式会社製)8部、SNデフォーマー1316 0.1部、サーフィノ―ル104(表面調整剤、アセチレンジオール化合物、エアープロダクツ株式会社製)0.1部を仕込み、攪拌して均一に混合した。ここに、上記ミルベース34.3部を仕込み、均一に攪拌したものを塗料とした。   While stirring, 50 parts of the aqueous resin dispersion obtained in each production example was charged with 3.6 parts of butyl cellosolve and 3.6 parts of propylene glycol monomethyl ether. Next, 0.3 parts of Nopcoat PEM-17 (release agent, oxidized polyethylene emulsion, manufactured by San Nopco Co., Ltd.), SN thickener 623N (a mixture of thickener, modified urethane polymer, high boiling alcohol solvent, water, etc.) , Manufactured by San Nopco Co., Ltd.) 8 parts, SN deformer 1316 0.1 part, Surfanol 104 (surface conditioner, acetylenic diol compound, manufactured by Air Products Co., Ltd.) 0.1 part, stirred and mixed uniformly . Here, 34.3 parts of the above mill base was charged and uniformly stirred to obtain a paint.

表2に塗料(実施例1〜4、比較例1〜3)の原料使用量および塗料性状、性能試験結果を示した。   Table 2 shows the raw material usage, paint properties, and performance test results of the paints (Examples 1 to 4 and Comparative Examples 1 to 3).

Figure 2010143954
Figure 2010143954

(試験板の作成)
実施例1〜4、比較例1〜3の塗料を、予め30℃にプレヒートしたスレート板(JIS A 5430に規定のスレート板))にスポンジロールコーター(ビュルクル社製D−7290)を使用して塗布量が片面75g/mとなる様に塗装し、80℃で10分強制乾燥し室温まで放冷したものを試験板とした。
(Creation of test plate)
Using a sponge roll coater (D-7290 manufactured by Bulcle) on a slate plate (slate plate defined in JIS A 5430) preheated to 30 ° C. in advance with the paints of Examples 1-4 and Comparative Examples 1-3. The test plate was coated so that the coating amount was 75 g / m 2 on one side, forcedly dried at 80 ° C. for 10 minutes and allowed to cool to room temperature.

(耐透水性)
試験板の塗膜上に10cm×10cmの金枠を設置し、塗膜と金枠の外周の間をシーリング剤で防水処理を施した。ここに、200gの水を入れ室温で24時間放置した後に水を廃棄し、試験前(水を入れる前)と後(水を廃棄して余分な水分を拭いた直後)の重量差を測定した。この重量差を下記の評価基準で評価した。
◎ : 0〜200g/m未満
○ : 200g/m以上400g/m未満
△ : 400g/m以上500g/m未満
× : 500g/m以上
(Water permeability resistance)
A 10 cm × 10 cm metal frame was placed on the coating film of the test plate, and a waterproof treatment was applied between the coating film and the outer periphery of the metal frame with a sealing agent. Here, 200 g of water was added and allowed to stand at room temperature for 24 hours, then the water was discarded, and the weight difference before and after the test (before adding water) and after (just after wiping off excess water) was measured. . This weight difference was evaluated according to the following evaluation criteria.
◎: less than 0~200g / m 2 ○: 200g / m 2 more than 400g / m less than 2 △: 400g / m 2 more than 500g / m 2 less than ×: 500g / m 2 or more

(耐ブロッキング性)
試験板の塗面と塗面を合わせそこに10kg/cmの圧力を掛けて、60℃雰囲気下で5時間放置した。試験後、試験体を室温まで放冷し、その時の塗面と塗面の固着具合で耐ブロッキング性を下記の評価基準で評価した。
◎ : 全く固着なし
○ : 固着は僅かで、手で容易に引き離すことができる
△ : 固着があり、手で引き離すことができるが、塗膜に跡が残る
× : 固着が強く、手で引き離すことができない
(Blocking resistance)
The coated surface and the coated surface of the test plate were combined, a pressure of 10 kg / cm 2 was applied thereto, and the sample was left in an atmosphere at 60 ° C. for 5 hours. After the test, the test body was allowed to cool to room temperature, and blocking resistance was evaluated according to the following evaluation criteria based on the degree of adhesion between the coated surface and the coated surface at that time.
◎: No sticking ○: Sticking is slight and can be easily pulled apart by hand △: Sticking and can be pulled by hand, but marks remain on the coating film ×: Strongly sticking, pulling by hand Can't

(密着性)
試験板上に、カッターナイフで4mm間隔に5×5マス目の碁盤目状の切れ目を入れ、セロハンテープで圧着剥離し塗膜の残存状態を観察した。
◎ : 剥離したマス目がないもの
○ : 剥離したマス目が1つのもの
△ : 剥離したマス目が2つのもの
× : 剥離したマス目が3つ以上のもの
(Adhesion)
On the test plate, 5 × 5 square grid-like cuts were made at intervals of 4 mm with a cutter knife, pressure-bonded with cellophane tape, and the remaining state of the coating film was observed.
◎: No peeled squares ○: One peeled square △: Two peeled squares ×: Three or more peeled squares

本発明の水性樹脂分散体は1液型であり、多孔質の無機系基材、特に住宅建築に使用されるセメントスラグ板、木片セメント板、パルプ繊維セメント板、軽量気泡コンクリート板、珪酸カルシウム板等の無機系建材の塗料用途に好適に使用され、基材への浸透性、付着性、基材に対する補強効果において、従来技術にない優れた性能を発揮させることができる。また乾燥性にも優れ、建材の積み上げ時、特に夏場の高温多湿時においても、優れた耐ブロッキング性を発揮する。   The aqueous resin dispersion of the present invention is a one-component type, and is a porous inorganic base material, especially cement slag board, wood chip cement board, pulp fiber cement board, lightweight cellular concrete board, calcium silicate board used for residential construction. It can be suitably used for coating applications of inorganic building materials such as, and can exhibit excellent performance that is not found in the prior art in terms of permeability to substrates, adhesion, and reinforcing effect on substrates. It also has excellent drying properties and exhibits excellent blocking resistance even when building materials are piled up, especially in the hot and humid season.

Claims (3)

α、β−エチレン性不飽和単量体量を乳化重合して得られる、多孔質の無機系基材用塗料に供せられる水性樹脂分散体であり、該α、β−エチレン性不飽和単量体量全体の中で、(1)アクリロニトリルが10〜40重量%、(2)単独重合体のTgが50℃以上である、アクリロニトリル以外のα、β−エチレン性不飽和単量体が30〜80重量%、かつ残りの部分は(3)その他のα、β−エチレン性不飽和単量体が共重合された水性樹脂分散体。   An aqueous resin dispersion obtained by emulsion polymerization of an α, β-ethylenically unsaturated monomer amount and used for a porous inorganic base material coating, wherein the α, β-ethylenically unsaturated monomer In the total amount of the monomer, (1) 10 to 40% by weight of acrylonitrile and (2) 30 g of α, β-ethylenically unsaturated monomer other than acrylonitrile, wherein the Tg of the homopolymer is 50 ° C. or higher. -80% by weight, and the remaining part is (3) an aqueous resin dispersion copolymerized with other α, β-ethylenically unsaturated monomers. 請求項1に記載の水性樹脂分散体が、α、β−エチレン性不飽和単量体量を二段階に分割使用し、かつそれぞれの単量体を乳化重合して得られる水性樹脂分散体であり、一段目に続く二段目の重合反応において、一段目および二段目に使用する全アクリロニトリルのうち、少なくとも80重量%以上を二段目に使用することを特徴とする請求項1に記載の水性樹脂分散体。   The aqueous resin dispersion according to claim 1 is an aqueous resin dispersion obtained by dividing and using the amount of α, β-ethylenically unsaturated monomer in two stages and emulsion polymerization of each monomer. And, in the second stage polymerization reaction following the first stage, at least 80% by weight or more of the total acrylonitrile used in the first stage and the second stage is used in the second stage. An aqueous resin dispersion. 請求項1あるいは請求項2に記載の水性樹脂分散体を必須成分とする、多孔質の無機系基材に塗装される塗料。



















A paint to be coated on a porous inorganic base material comprising the aqueous resin dispersion according to claim 1 or 2 as an essential component.



















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