JP5534887B2 - Foam fireproof paint - Google Patents
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- JP5534887B2 JP5534887B2 JP2010068609A JP2010068609A JP5534887B2 JP 5534887 B2 JP5534887 B2 JP 5534887B2 JP 2010068609 A JP2010068609 A JP 2010068609A JP 2010068609 A JP2010068609 A JP 2010068609A JP 5534887 B2 JP5534887 B2 JP 5534887B2
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- vinyl acetate
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- acrylic copolymer
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Description
本発明は、厚塗りした場合でも乾燥塗膜のクラックやピンホールの発生が抑制された発泡性耐火塗料に関する。 The present invention relates to a foamable refractory paint in which generation of cracks and pinholes in a dried coating film is suppressed even when thickly applied.
発泡性耐火塗料は、鉄骨造の建築建造物の柱、梁などに用いられる鋼材を火災から保護する目的で用いられる塗料であり、この塗料からなる塗膜は火災時に発泡して耐火断熱層を形成することにより鋼材の過度の温度上昇による強度低下を抑制する作用がある。 Foam fire-resistant paint is a paint used for the purpose of protecting steel materials used for pillars and beams of steel structure buildings from fire, and the paint film made of this paint foams at the time of fire to form a fire-resistant insulation layer. By forming, there exists an effect | action which suppresses the strength reduction by the excessive temperature rise of steel materials.
発泡性耐火塗料としては、例えば、特許文献１〜３等に記載されており、発泡性耐火塗料に含まれる有機結合材（合成樹脂）としては、例えば、メラミン樹脂、アクリル樹脂、アルキッド樹脂、塩化ビニル樹脂、酢酸ビニル樹脂、ウレタン樹脂、エポキシ樹脂、シリコーン樹脂、ポリエステル樹脂等が知られている（特許文献１の［0007］、特許文献２の［0012］段落、特許文献３の［0017］段落等）。 Examples of the foamable fireproof paint are described in Patent Documents 1 to 3 and the like. Examples of the organic binder (synthetic resin) contained in the foamable fireproof paint include melamine resin, acrylic resin, alkyd resin, and chloride. Vinyl resins, vinyl acetate resins, urethane resins, epoxy resins, silicone resins, polyester resins and the like are known ([0007] in Patent Document 1, [0012] Paragraph of Patent Document 2, and [0017] Paragraph of Patent Document 3). etc).
ところで、従来の発泡性耐火塗料を厚塗りする場合には、乾燥塗膜にクラックやピンホール等が生じることが指摘されており、これらは塗膜の外観不良や剥離等の原因となり得る。そのため、厚塗りした場合でもクラックやピンホール等の発生が抑制された発泡性耐火塗料の開発が進められているが、未だ十分な成果は得られていない。 Incidentally, it has been pointed out that cracks, pinholes and the like are generated in the dried coating film when thickly applying a conventional foamable fire-resistant coating material, which may cause poor appearance or peeling of the coating film. For this reason, development of a foamable fireproof paint in which the occurrence of cracks, pinholes and the like is suppressed even when thickly applied has been promoted, but sufficient results have not yet been obtained.
従って、厚塗りした場合でも乾燥塗膜のクラックやピンホールの発生が抑制された発泡性耐火塗料の開発が求められている。 Accordingly, there is a demand for the development of a foamable fire-resistant coating material in which cracks and pinholes are prevented from occurring even when thickly coated.
本発明は、厚塗りした場合でも乾燥塗膜のクラックやピンホールの発生が抑制された発泡性耐火塗料を提供することを目的とする。 An object of the present invention is to provide a foamable fire-resistant paint in which generation of cracks and pinholes in a dried coating film is suppressed even when thick coating is applied.
本発明者は、上記目的を達成すべく鋭意研究を重ねた結果、特定の有機結合材を用いる場合には上記目的を達成できることを見出し、本発明を完成するに至った。 As a result of intensive studies to achieve the above object, the present inventor has found that the above object can be achieved when a specific organic binder is used, and has completed the present invention.
即ち、本発明は、下記の発泡性耐火塗料に関する。
１． 有機結合材として、酢酸ビニル重合体及び酢酸ビニル／アクリル共重合体を含有し、
さらにメラミンを含有する、
ことを特徴とする発泡性耐火塗料。
２． 多価アルコールを含有する、上記項１に記載の発泡性耐火塗料。
３． 難燃性発泡剤、充填剤、増粘剤、造膜助剤及び消泡剤からなる群から選ばれた少なくとも１種を含有する、上記項１又は２に記載の発泡性耐火塗料。
４． 前記酢酸ビニル重合体と前記酢酸ビニル／アクリル共重合体との重量比が、酢酸ビニル重合体：酢酸ビニル／アクリル共重合体＝９０：１０〜１０：９０（固形分換算）である、上記項１〜３のいずれかに記載の発泡性耐火塗料。
５． 前記酢酸ビニル重合体と前記酢酸ビニル／アクリル共重合体との重量比が、酢酸ビニル重合体：酢酸ビニル／アクリル共重合体＝８０：２０〜５０：５０（固形分換算）である、上記項１〜４のいずれかに記載の発泡性耐火塗料。
６． ウレタン系増粘剤を含有する、上記項１又は２に記載の発泡性耐火塗料。
That is, the present invention relates to the following foamable fireproof paint.
1. As an organic binder, contains vinyl acetate polymer and vinyl acetate / acrylic copolymer ,
Containing melamine,
A foaming fireproof paint characterized by that.
2. Item 2. The foamable fire-resistant paint according to item 1 containing a polyhydric alcohol.
3. Item 3. The foamable fireproof paint according to Item 1 or 2, which contains at least one selected from the group consisting of a flame retardant foaming agent, a filler, a thickener, a film-forming aid, and an antifoaming agent.
4). The said item whose weight ratio of the said vinyl acetate polymer and the said vinyl acetate / acrylic copolymer is vinyl acetate polymer: vinyl acetate / acrylic copolymer = 90: 10-10: 90 (solid content conversion). The foamable fire-resistant paint according to any one of 1 to 3.
5. The said item whose weight ratio of the said vinyl acetate polymer and the said vinyl acetate / acrylic copolymer is vinyl acetate polymer: vinyl acetate / acrylic copolymer = 80: 20-50: 50 (solid content conversion). The foamable fireproof paint according to any one of 1 to 4.
6 . Item 3. The foamable fireproof paint according to Item 1 or 2 , which contains a urethane thickener.
以下、本発明の発泡性耐火塗料について詳細に説明する。 Hereinafter, the foamable fireproof paint of the present invention will be described in detail.
本発明の発泡性耐火塗料は、有機結合材として酢酸ビニル重合体及び酢酸ビニル／アクリル共重合体を含有することを特徴とする。当該２種類の合成樹脂を併用することにより、発泡性耐火塗料を厚塗り（塗布１回当たりの乾燥膜厚が０．５ｍｍ以上）した場合でも乾燥塗膜のクラックやピンホールの発生を抑制することができる。 The foamable fireproof paint of the present invention is characterized by containing a vinyl acetate polymer and a vinyl acetate / acrylic copolymer as an organic binder. By using these two types of synthetic resins in combination, even when foamed fireproof paint is applied thickly (dry film thickness per application is 0.5 mm or more), the generation of cracks and pinholes in the dried coating is suppressed. be able to.
有機結合材（合成樹脂）
本発明の発泡性耐火塗料では、有機結合材としては、酢酸ビニル重合体及び酢酸ビニル／アクリル共重合体を含有する。これらの合成樹脂は、有機溶媒に溶解させたもの又はエマルションとして水系分散媒に分散させたものが利用できる。水系分散媒としては水が好ましく、本発明では水を分散媒としたエマルションが好適に利用できる。
Organic binder (synthetic resin)
In the foamable fire-resistant paint of the present invention, the organic binder contains a vinyl acetate polymer and a vinyl acetate / acrylic copolymer. As these synthetic resins, those dissolved in an organic solvent or those dispersed in an aqueous dispersion medium as an emulsion can be used. As the aqueous dispersion medium, water is preferable. In the present invention, an emulsion using water as a dispersion medium can be suitably used.
有機結合材としては、実質的に上記２種の合成樹脂から構成されることが好ましく、酢酸ビニル重合体：酢酸ビニル／アクリル共重合体の重量比としては、固形分換算で９０：１０〜１０：９０が好ましく、８０：２０〜５０：５０がより好ましい。 The organic binder is preferably substantially composed of the above-mentioned two kinds of synthetic resins, and the weight ratio of vinyl acetate polymer: vinyl acetate / acrylic copolymer is 90:10 to 10 in terms of solid content. : 90 is preferable, and 80:20 to 50:50 is more preferable.
なお、本発明の効果を損なわない範囲で他の合成樹脂を併用することもできる。併用し得る合成樹脂としては、例えば、メラミン樹脂、アクリル樹脂、アルキッド樹脂、塩化ビニル樹脂、ウレタン樹脂、エポキシ樹脂、シリコーン樹脂、ポリエステル樹脂等が挙げられる。これらの合成樹脂は１種又は２種以上を混合して使用できる。但し、これらの合成樹脂を併用する場合であっても、固形分換算の有機結合材１００重量％に含まれる酢酸ビニル重合体及び酢酸ビニル／アクリル共重合体の含有量が固形分換算で５０重量％以上が好ましく、９０重量％以上がより好ましい。 In addition, another synthetic resin can also be used together in the range which does not impair the effect of this invention. Examples of the synthetic resin that can be used in combination include melamine resin, acrylic resin, alkyd resin, vinyl chloride resin, urethane resin, epoxy resin, silicone resin, and polyester resin. These synthetic resins can be used alone or in combination of two or more. However, even when these synthetic resins are used in combination, the content of the vinyl acetate polymer and the vinyl acetate / acrylic copolymer contained in 100% by weight of the organic binder in terms of solid content is 50% in terms of solid content. % Or more is preferable, and 90% by weight or more is more preferable.
その他の成分
発泡性耐火塗料に含まれるその他の成分は特に限定されず、公知の発泡性耐火塗料に用いられている成分の中から適宜選択して使用できる。以下では、本発明で使用できる他の成分の一例について説明する。
（含窒素発泡剤）
含窒素発泡剤としては限定されず、例えば、ジシアンジアミド、アゾジカルボンアミド、メラミン及びその誘導体、尿素、リン酸グアニル尿素、グアニジン、トリメチロールメラミン、ヘキサメチロールメラミン等の中から適宜選択できる。
Other components Other components contained in the foamable fireproof paint are not particularly limited, and can be appropriately selected from components used in known foamable fireproof paints. Below, an example of the other component which can be used by this invention is demonstrated.
(Nitrogen-containing foaming agent)
The nitrogen-containing blowing agent is not limited, and can be appropriately selected from dicyandiamide, azodicarbonamide, melamine and derivatives thereof, urea, guanylurea phosphate, guanidine, trimethylolmelamine, hexamethylolmelamine and the like.
含窒素発泡剤の含有量としては、固形分換算の有機結合材１００重量部に対して１０〜１５０重量部が好ましい。
（難燃性発泡剤）
難燃性発泡剤としては限定されず、例えば、リン酸アンモニウム、ポリリン酸アンモニウム等のリン酸塩；メラミン被覆したポリリン酸アンモニウム；シリコーン被覆したポリリン酸アンモニウムなどが利用できる。中でもメラミン被覆したポリリン酸アンモニウム及びシリコーン被覆したポリリン酸アンモニウムは耐水性が高い点で好ましい。
As content of a nitrogen-containing foaming agent, 10-150 weight part is preferable with respect to 100 weight part of organic binder of solid content conversion.
(Flame retardant foaming agent)
The flame retardant foaming agent is not limited, and examples thereof include phosphates such as ammonium phosphate and ammonium polyphosphate; melamine-coated ammonium polyphosphate; silicone-coated ammonium polyphosphate. Of these, melamine-coated ammonium polyphosphate and silicone-coated ammonium polyphosphate are preferred because of their high water resistance.
難燃性発泡剤の含有量としては、固形分換算の有機結合材１００重量部に対して５０〜２００重量部が好ましい。
（炭化層形成剤）
炭化層形成剤としては限定されず、例えば、ペンタエリスリトール、ジペンタエリスリトール、トリペンタエリスリトール、ポリペンタエリスリトール等の多価アルコールの中から適宜選択できる。
As content of a flame-retardant foaming agent, 50-200 weight part is preferable with respect to 100 weight part of organic binder of solid content conversion.
(Carbonized layer forming agent)
The carbonized layer forming agent is not limited, and can be appropriately selected from polyhydric alcohols such as pentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, and the like.
炭化層形成剤の含有量としては、固形分換算の有機結合材１００重量部に対して２０〜８０重量部が好ましい。
（充填剤）
充填剤としては限定されず、公知の発泡性耐火塗料に含まれるものが使用できる。例えば、二酸化チタン、酸化亜鉛、炭酸カルシウム、水酸化アルミニウム、水酸化マグネシウム、タルク、マイカ、珪酸カルシウム、アルミナ、シリカ、ガラスフィラー、ガラスバルーン、シラスバルーン、無機繊維、ロックウール等の中から適宜選択できる。
As content of a carbonization layer forming agent, 20-80 weight part is preferable with respect to 100 weight part of organic binder of solid content conversion.
(filler)
It does not limit as a filler, The thing contained in a well-known foamable fireproof paint can be used. For example, titanium dioxide, zinc oxide, calcium carbonate, aluminum hydroxide, magnesium hydroxide, talc, mica, calcium silicate, alumina, silica, glass filler, glass balloon, shirasu balloon, inorganic fiber, rock wool, etc. it can.
充填剤の含有量としては、固形分換算の有機結合材１００重量部に対して３０〜１００重量部が好ましい。
（増粘剤）
増粘剤の添加は粘度や粘性の調整による塗り易さの向上を目的とするが、乾燥塗膜のクラックやピンホールの抑制効果も期待できる。増粘剤としては、ウレタン系増粘剤、アクリル系増粘剤、ポリアマイド系増粘剤、セルロース系増粘剤、ベントナイト等の粘土鉱物等の公知の増粘剤を用いることができるが、特にウレタン系増粘剤を用いる場合には発泡後のクラックや脱落の発生も抑制できるため、耐火性能低下の影響が小さい点で好ましい。
As content of a filler, 30-100 weight part is preferable with respect to 100 weight part of organic binder of solid content conversion.
(Thickener)
The addition of a thickener is intended to improve the ease of application by adjusting the viscosity and viscosity, but it can also be expected to suppress cracks and pinholes in the dried coating film. As the thickener, known thickeners such as urethane thickeners, acrylic thickeners, polyamide thickeners, cellulose thickeners, clay minerals such as bentonite, etc. can be used. In the case of using a urethane-based thickener, cracking and falling off after foaming can be suppressed, which is preferable in that the influence of a decrease in fire resistance is small.
増粘剤の含有量としては、固形分換算の有機結合材１００重量部に対して１〜５０重量部が好ましい。
（造膜助剤）
造膜助剤としては限定されず、公知の発泡性耐火塗料に含有されるものが使用できる。例えば、ポリオキシアルキレンエーテル系、ポリプロピレングリコールモノメチルエーテル系、ジエチレングリコールモノブチルエーテルアセテート系等が利用できる。
As content of a thickener, 1-50 weight part is preferable with respect to 100 weight part of organic binder of solid content conversion.
(Film forming aid)
It does not limit as a film-forming aid, What is contained in a well-known foamable fireproof paint can be used. For example, polyoxyalkylene ether, polypropylene glycol monomethyl ether, diethylene glycol monobutyl ether acetate and the like can be used.
造膜助剤の含有量は、他の成分の配合量等を考慮して適宜選択すればよい。
（消泡剤）
消泡剤としては限定されず、公知の発泡性耐火塗料に含有されるものが使用できる。例えば、シリコーン系エマルション等が利用できる。
The content of the film-forming aid may be appropriately selected in consideration of the blending amount of other components.
(Defoamer)
It does not limit as an antifoamer, What is contained in a well-known foaming fireproof paint can be used. For example, a silicone emulsion can be used.
消泡剤の含有量は、他の成分の配合量等を考慮して適宜選択すればよい。
（その他の添加剤）
その他の添加剤として、難燃助剤、分散剤、湿潤剤、沈降防止剤等の公知の発泡性耐火塗料に含まれる添加剤が使用できる。
What is necessary is just to select content of an antifoamer suitably considering the compounding quantity etc. of another component.
(Other additives)
As other additives, additives contained in known foamable fireproof paints such as flame retardant aids, dispersants, wetting agents, anti-settling agents and the like can be used.
発泡性耐火塗料は、上記各成分を十分に混合撹拌することにより得られる。発泡性耐火塗料は刷毛、スプレー等の通常の塗装方法により塗装することができるほか、コテ、へら、ローラー等による施工も可能である。特に本発明の発泡性耐火塗料は、厚塗り（塗布１回当たりの乾燥膜厚が０．５ｍｍ以上）した場合でも乾燥塗膜のクラックやピンホールの発生を抑制することができる。 The foamable fireproof paint can be obtained by sufficiently mixing and stirring the above components. The foamable fire-resistant paint can be applied by a normal coating method such as brush or spray, and can also be applied with a trowel, spatula, roller or the like. In particular, the foamable fire-resistant paint of the present invention can suppress the occurrence of cracks and pinholes in the dried coating film even when it is thickly coated (the dry film thickness per application is 0.5 mm or more).
発泡性耐火塗料は、鉄骨だけでなく、適当な表面処理を施した後、アルミニウム、亜鉛鉄板、石綿セメント板などに好適に使用される。また、木材、合板、紙、繊維等の可燃性物質の準不燃化又は難燃化にも有用である。それ以外には電線ケーブルの被覆にも有効である。 The foamable fire-resistant paint is suitably used not only for steel frames but also for aluminum, zinc-iron plates, asbestos-cement plates, etc. after appropriate surface treatment. It is also useful for making flammable materials such as wood, plywood, paper, and fibers semi-incombustible or flame retardant. Other than that, it is also effective for covering electric cables.
本発明の発泡性耐火塗料は、有機結合材として酢酸ビニル重合体及び酢酸ビニル／アクリル共重合体を含有することを特徴とする。当該２種類の合成樹脂を併用することにより、発泡性耐火塗料を厚塗り（塗布１回当たりの乾燥膜厚が０．５ｍｍ以上）した場合でも乾燥塗膜のクラックやピンホールの発生を抑制することができる。 The foamable fireproof paint of the present invention is characterized by containing a vinyl acetate polymer and a vinyl acetate / acrylic copolymer as an organic binder. By using these two types of synthetic resins in combination, even when foamed fireproof paint is applied thickly (dry film thickness per application is 0.5 mm or more), the generation of cracks and pinholes in the dried coating is suppressed. be able to.
以下、実施例、比較例及び参考例を示して本発明を具体的に説明する。但し、本発明は実施例に限定されない。 Hereinafter, the present invention will be specifically described with reference to Examples , Comparative Examples, and Reference Examples . However, the present invention is not limited to the examples.
実施例２〜３、比較例１〜２、並びに参考例１及び４
（試料調製）
表１に示す材料を十分に混合撹拌することにより各発泡性耐火塗料を調製した。
Examples 2-3, Comparative Examples 1-2 , and Reference Examples 1 and 4
(Sample preparation)
Each foamable refractory paint was prepared by thoroughly mixing and stirring the materials shown in Table 1.
表１中の有機結合材（合成樹脂）には以下のものを用いた。また、有機結合材の重量部は固形分換算である。
※酢酸ビニル／アクリル共重合体水性エマルションは、ニチゴー・モビニール（株）製の商品名「モビニール662」（固形分50重量%）を用いた。
※酢酸ビニル重合体水性エマルションは、ニチゴー・モビニール（株）製の商品名「モビニールDC」（固形分56重量%）を用いた。
The following were used for the organic binder (synthetic resin) in Table 1. Moreover, the weight part of the organic binder is in terms of solid content.
* The product name “Movinyl 662” (solid content 50% by weight) manufactured by Nichigo Movinyl Co., Ltd. was used as the aqueous vinyl acetate / acrylic copolymer emulsion.
* As the vinyl acetate polymer aqueous emulsion, the product name “Movinyl DC” (solid content 56 wt%) manufactured by Nichigo Movinyl Co., Ltd. was used.
また、アゾジカルボンアミド、メラミン、メラミン被覆ポリリン酸アンモニウム、ペンタエリスリトール、ジペンタエリスリトール及び酸化チタンは粉末状の物を、ウレタン系増粘剤（ADEKA（株）製の商品名「アデカノールUH−450VF」）、アクリル系増粘剤、ポリオキシアルキレンエーテル系造膜助剤及びシリコーン系エマルション消泡剤は液状の物を用い、それらの重量部はその添加状態での添加重量部である。
（試験体作製）
（１）鉄板（縦150×横75×厚さ6mm）の前処理
エタノールにて鉄板表面をアルコール脱脂した。
（２）下塗材の塗装
JISK5621 ２種に分類される防錆塗料（商品名：サビロン♯１０ カナヱ塗料（株）製）を塗料用シンナーで希釈し粘性調整した後、ローラーにて目標乾燥膜厚３０μｍとして２回塗布した。乾燥後、電磁式膜厚計で試験体の３点を測定しその平均値を下塗の膜厚とした。
（３）発泡性耐火塗料の塗装
鉄板に１回の乾燥膜厚が０．５ｍｍとなるようにへら付けし、３回塗りで乾燥膜厚が１．５ｍｍとなるように塗装した。塗装間隔は５時間以上自然乾燥とし、３回目塗装後２日間以上自然乾燥させて試験体とした。電磁式膜厚計で試験体の３点を測定しその平均値と下塗りの膜厚との差を耐火塗料の膜厚とした。
In addition, azodicarbonamide, melamine, melamine-coated ammonium polyphosphate, pentaerythritol, dipentaerythritol and titanium oxide are in the form of a powder. ), Acrylic thickeners, polyoxyalkylene ether film-forming aids, and silicone-based emulsion antifoaming agents are in liquid form, and their parts by weight are the weight parts added in the added state.
(Test specimen production)
(1) Pretreatment of iron plate (length 150 × width 75 × thickness 6 mm) The surface of the iron plate was degreased with ethanol using ethanol.
(2) Application of primer
JISK5621 2 species classified as being anti-rust paint: After the (trade name Sabiron ♯10 Kana We paint Co., Ltd.) were viscosity adjusted diluted with paint thinner, was applied twice as a target dry film thickness of 30μm at the roller . After drying, three points of the specimen were measured with an electromagnetic film thickness meter, and the average value was taken as the film thickness of the primer.
(3) Application of foamable fireproof paint The steel plate was spatally applied so that the dry film thickness was 0.5 mm once, and was applied so that the dry film thickness was 1.5 mm by three times application. The coating interval was naturally dried for 5 hours or longer, and the specimen was naturally dried for 2 days or more after the third coating. Three points of the specimen were measured with an electromagnetic film thickness meter, and the difference between the average value and the film thickness of the undercoat was taken as the film thickness of the refractory paint.
上記工程を経て試験体（各実施例、比較例、参考例ごとに２試験体ずつ）を作製した。
（塗膜の外観観察及び評価方法）
耐火塗料を塗装した試験体の外観観察を実施した。耐火塗料の塗膜外観をJISK5600-8-4の規定による等級にて、割れ（クラック）の大きさ、量、深さについて評価した。評価基準は次の通りである。また、１０倍ルーペを用いて塗膜の最も大きいクラック幅及びピンホールの最大直径について０．１ｍｍの精度で測定した。ピンホールについては１０倍の視野で確認できるものについて、１ｃｍ２角内の個数を計測した。
≪JISK5600-8-4の割れの大きさの評価≫
等級０：１０倍に拡大しても視感できない
等級１：１０倍に拡大すれば視感できる
等級２：正常に補正された視力でやっと認識できる
等級３：正常に補正された視力で明らかに認識できる
等級４：一般的に幅１ｍｍに達する大きな割れ
等級５：一般的に幅１ｍｍを超える非常に大きな割れ
≪JISK5600-8-4の割れの量の評価≫
等級０：なし、すなわち判別できるような欠陥がない
等級１：極めてわずか、すなわちやっと判別できる程度の変化
等級２：わずか、すなわち小さいが判別できる量の欠陥
等級３：中低度、すなわち中程度の量の欠陥
等級４：重大、すなわち著しい量の欠陥
等級５：甚大、すなわち濃密なパターンの欠陥
≪JISK5600-8-4の割れの深さの評価≫
等級ａ：上塗を貫通していない表面の割れ
等級ｂ：上塗を貫通しているが、その下の塗膜は割れなし
等級ｃ：全塗装膜層を貫通している割れ
上記各項目の評価結果を表２に示す。
Through the above steps, test specimens (two test specimens for each example, comparative example, and reference example ) were prepared.
(Appearance observation and evaluation method of coating film)
The appearance of the test piece coated with fireproof paint was observed. The appearance of the fire-resistant paint film was evaluated with respect to the size, amount, and depth of cracks according to the grade specified in JISK5600-8-4. The evaluation criteria are as follows. Moreover, it measured with the precision of 0.1 mm about the largest crack width of a coating film, and the maximum diameter of a pinhole using the 10 time magnifier. For pinholes, the number within 1 cm 2 square was measured for those that could be confirmed with a 10 × field of view.
≪Evaluation of JISK5600-8-4 crack size≫
Grade 0: Cannot be seen even when magnified 10 times Grade 1: Visible when magnified 10 times Grade 2: Can be finally recognized with properly corrected sight Grade 3: Clearly revealed with normally corrected sight Recognizable Grade 4: Large crack generally reaching 1 mm in width Grade 5: Very large crack generally exceeding 1 mm in width << Evaluation of amount of crack in JISK5600-8-4 >>
Grade 0: None, ie no discernable defects Grade 1: Extremely slight, i.e., barely discernable change Grade 2: Minor, i.e. small, discernable amount of grades Grade 3: Moderate, i.e. moderate Amount of defects Grade 4: Severe or significant amount of defects Grade 5: Enormous or dense pattern defects << Evaluation of crack depth of JISK5600-8-4 >>
Grade a: Surface crack not penetrating the top coat Grade b: Penetrating the top coat, but the coating below it is not cracked Grade c: Crack penetrating the entire paint film layer Evaluation results of the above items Is shown in Table 2.
（考 察）
以上の結果から明らかな通り、有機結合材として酢酸ビニル重合体及び酢酸ビニル／アクリル共重合体を含有する実施例２〜３の発泡性耐火塗料から形成される乾燥塗膜はクラック及びピンホールの発生が抑制されていることが分かる。他方、１種の合成樹脂しか含まない比較例１、２では、合成樹脂（有機結合材）以外の配合が同じである参考例１に比べて、クラック及びピンホールの発生量が多くなっている。即ち、乾燥塗膜のクラックやピンホール等の発生を抑制するためには、酢酸ビニル重合体及び酢酸ビニル／アクリル共重合体を含有する有機結合材を用いることが有利であると分かる。
(Discussion)
As is apparent from the above results, the dried coating film formed from the foamable fire-resistant paints of Examples 2 to 3 containing a vinyl acetate polymer and a vinyl acetate / acrylic copolymer as an organic binder has cracks and pinholes. It turns out that generation | occurrence | production is suppressed. On the other hand, in Comparative Examples 1 and 2 containing only one type of synthetic resin, the amount of generation of cracks and pinholes is larger than in Reference Example 1 in which the composition other than the synthetic resin (organic binder) is the same. . That is, it can be seen that it is advantageous to use an organic binder containing a vinyl acetate polymer and a vinyl acetate / acrylic copolymer in order to suppress the occurrence of cracks and pinholes in the dried coating film.
また、実施例２〜３、比較例１〜２、並びに参考例１及び４の乾燥塗膜を電気炉で加熱して発泡耐火層を形成したところ、実施例２〜３、比較例１〜２及び参考例１は同程度の発泡耐火層が得られたが、ウレタン系以外の増粘剤（アクリル系増粘剤）を用いた参考例４は発泡耐火層の発泡高さがやや低く一部に鉄板からの脱落が見られた。 Moreover, when the foamed fireproof layer was formed by heating the dry coating films of Examples 2 to 3 , Comparative Examples 1 and 2 , and Reference Examples 1 and 4 in an electric furnace, Examples 2 to 3 and Comparative Examples 1 to 2 were formed. And in Reference Example 1, the same level of foamed refractory layer was obtained, but in Reference Example 4 using a thickener other than urethane (acrylic thickener), the foam height of the foamed refractory layer was slightly lower and partly The dropout from the iron plate was observed.
また、実施例２の配合の耐火塗料を鋼管柱（□−300×300×ｔ19mm，L=3500mm）に乾燥膜厚1.0mmで施工し、耐火試験を実施したところ、建築基準法第２条七号の試験・評価における１時間耐火の性能を有していた。 In addition, when the fireproof paint of the composition of Example 2 was applied to a steel pipe column (□ -300 × 300 × t19mm, L = 3500mm) with a dry film thickness of 1.0mm and fire resistance test was conducted, the Building Standards Act Article 2-7 1 hour fire resistance performance in the test and evaluation of No.
Claims (6)
さらにメラミンを含有する、
ことを特徴とする発泡性耐火塗料。 As an organic binder, contains vinyl acetate polymer and vinyl acetate / acrylic copolymer ,
Containing melamine,
A foaming fireproof paint characterized by that.
請求項１〜３のいずれかに記載の発泡性耐火塗料。The foamable fireproof paint according to any one of claims 1 to 3.
請求項１〜４のいずれかに記載の発泡性耐火塗料。The foamable fireproof paint according to any one of claims 1 to 4.
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| DE102016203911A1 (en) * | 2016-03-10 | 2017-09-14 | Clariant Plastics & Coatings Ltd | Halogen-free, intumescent fire protection coating and its use |
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