JP3585394B2 - Novel tricarbonyl compound, method for producing the same, and metal rust inhibitor using the same - Google Patents

Novel tricarbonyl compound, method for producing the same, and metal rust inhibitor using the same Download PDF

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JP3585394B2
JP3585394B2 JP14686299A JP14686299A JP3585394B2 JP 3585394 B2 JP3585394 B2 JP 3585394B2 JP 14686299 A JP14686299 A JP 14686299A JP 14686299 A JP14686299 A JP 14686299A JP 3585394 B2 JP3585394 B2 JP 3585394B2
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compound
tricarbonyl compound
novel
terminal
rust
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JP2000336067A (en
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正志 熊谷
徹 伊森
義徳 阿久津
高志 大内
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Nippon Mining Holdings Inc
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Nikko Materials Co Ltd
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Description

【0001】
【発明の属する技術分野】
各種金属材料表面に対する要求は様々であるが、防錆性が重要な特性の一つとして挙げられる。鉄鋼製品は建築物、自動車、船舶、缶など様々なところで使用されているが、防錆性に対して強い要求がある。鉄鋼製品の防錆性には、従来、水溶性防錆剤、気化性防錆剤、油性防錆剤等の各種防錆剤が使用されている。一般的に水溶性防錆剤は一時的短時間の防錆を目的とし、長期の防錆には用いられていない。また、気化性防錆剤は密閉状態で本来の防錆力を発揮するものである。油性防錆剤は比較的防錆力が強く長期の防錆に耐えるものであり、液状の防錆油、粘着性の防錆グリース、防錆添加剤や皮膜形成剤等を揮発性有機溶剤に溶解したもの等がある。しかし、防錆油や防錆グリースは、表面処理後にべたつきが生じ、塗膜等の下塗り材として使用できない。又、防錆添加剤や皮膜形成剤等を揮発性有機溶剤に溶解したものは厚膜化しないと十分な防錆効果を発揮しない。
【0002】
又、鉄の錆を抑制するために亜鉛めっき鋼板が市販されているが、これは鉄よりイオン化傾向が大きい亜鉛の犠牲防食作用により鉄の錆を防止するものであり、さらに亜鉛めっき層の表面にクロメート処理等の化成処理を施すことにより亜鉛層の白錆を防止し、耐食性を一層強化している。しかしこのクロメート処理は、薄い皮膜においても高い防錆性が得られるものの、環境上の問題からこれに変わる防錆皮膜が望まれている。現在タンニン酸が亜鉛めっき鋼板の防錆剤として提案されているが、クロメート処理に比べて十分とはいえない現状にある。
【0003】
アルミニウムまたはアルミニウム合金は軽量であるために各種分野において注目されている。しかし、表面に酸化アルミニウムの皮膜が形成されているためアルミニウムに対して直接塗料を塗っても、その密着性は十分ではない。塗装下地用の化成処理方法として多くの方法が提案され、今日でも多数の特許が発表されているが、現状では米国や我が国においてはクロメート処理法が主流となっている。しかしながら、上記亜鉛めっき鋼板と同様にクロメート処理は環境上好ましくなく、ノンクロメート処理が望まれている。また、金属表面に耐食性、帯電防止性等の特性を付与する目的でケイ酸のアルカリ金属塩水溶液で処理する方法が提案されているが、その処理温度が高かったり、後処理として沸騰水浸漬や酸浸漬を行い、アルカリ金属を除去しなければ所望の特性は得られない。
【0004】
【発明が解決しようとする課題】
本発明は、こうした要請に対応できる、すなわち金属、特にはアルミニウム、銅、鉄鋼製品に対して、金属表面に強く吸着し、薄膜においても優れた防錆作用を有する新規トリカルボニル化合物、新規トリカルボニル基含有アクリル共重合体、または新規トリカルボニルアミン付加物およびそれらを用いた水溶性金属防錆剤を提供することを目的とするものである。
【0005】
【課題を解決するための手段】
本発明者らは、鋭意検討を進めた結果、下記一般式(1)で表される新規トリカルボニル化合物が金属表面に対して優れた防錆作用を有することを見出した。
【0006】
本発明は、かかる知見に基づきなされたものであり、その要旨は、
(1)下記一般式(1)で表される新規トリカルボニル化合物、
【0007】
【化3】

Figure 0003585394
【0008】
(ただし、式中、R、R、Rは炭素数が1〜10のアルキル基、末端に二重結合を有する炭素数2〜10のアルケニル基、または末端にエポキシ基を有する炭素数2〜10のアルキル基であって、かつ、R、R、Rのうち少なくともいずれか1つは末端にエポキシ基を有する炭素数2〜10のアルキル基であり、x、y、zは0または1を示す。また、該化合物はエノール型も含む。)
(2)下記一般式(2)で表されるジカルボニル化合物と一般式(3)で表される化合物とを反応させることにより末端に二重結合を有するトリカルボニル化合物を合成した後、二重結合をエポキシ化させることにより、前記(1)記載のエポキシ基含有新規トリカルボニル化合物を製造することを特徴とする、新規トリカルボニル化合物の製造方法、
【0009】
【化4】
Figure 0003585394
【0010】
(ただし、式中、R、R、Rは前記と同義、R、R、Rは炭素数が1〜10のアルキル基、末端に二重結合を有する炭素数2〜10のアルケニル基であって、かつ、R、R、Rのうち少なくともいずれか1つは末端に二重結合を有する炭素数2〜10のアルケニル基であり、x、y、zは0または1を示す。また上記一般式(1)、(4)はエノール型も含む。)
(3)前記(1)に記載の新規トリカルボニル化合物を有効成分とする金属防錆剤、
にある。
【0011】
本発明の新規トリカルボニル化合物は、前記一般式(2)で表されるジカルボニル化合物と一般式(3)で表される酸クロリド等との反応により末端に二重結合を有するトリカルボニル化合物を合成した後、これをエポキシ化することにより合成することができる。
【0012】
上記反応式に用いられる一般式(3)で表される化合物としては、アセチルクロリド、プロピオニルクロリド、ブチリルクロリド、t−ブチルアセチルクロリド、2−エチルブチリルクロリド、バレリルクロリド、イソバレリルクロリド、2−メチルバレリルクロリド、ヘキサノイルクロリド、2−エチルヘキサノイルクロリド、ヘプタノイルクロリド、オクタノイルクロリド、ノナノイルクロリド、デカノイルクロリド、アクリル酸クロリド、10−ウンデセノイルクロリドである。又、カルボン酸を塩化チオニル、三塩化リン、五塩化リン等により酸クロリド化してもよい。
【0013】
上記反応式に用いられる一般式(2)で表わされるジカルボニル化合物は、2,4−ペンタンジオン、2,2,6,6−テトラメチル−3,5−ヘプタンジオン、アセト酢酸メチル、アセト酢酸エチル、アセト酢酸n−ブチル、アセト酢酸t−ブチル、プロピオニル酢酸エチル、ブチリル酢酸エチル、ジメチルマロネート、ジエチルマロネート、アセト酢酸アリル等が挙げられる。
上記反応式の反応は文献〔M.W.Rathke,P.J.,Cowan,J.Org.Chem.,50,2622,1988またはJ.Skarzewski,Tetrahedron,45,4593(1989)〕に基づいて合成できる。すなわち、反応溶媒にジカルボニル化合物と塩化マグネシウムを混合して混合溶液を得、この混合溶液中にアミンおよび一般式(3)で表される化合物を順次滴下する。そしてこれらを滴下後、反応を十分行わせるために、還流することが好ましい。反応時間は5分〜24時間程度で十分である。反応溶媒としては、塩化メチレンまたはアセトニトリル等が好適である。また、この反応は水分を嫌うので気相から水分が混入しないように、乾燥した窒素、アルゴン等の水分を含まない基体の雰囲気下で行うことが好ましい。
【0014】
また、一般式(4)で表される化合物としては、
【0015】
【化5】
Figure 0003585394
【0016】
【化6】
Figure 0003585394
【0017】
などがある。ただし、上記化合物はケト形のみ記載しているが、下記式に示すようにケト形とエノール形の互変異性体で存在しており、エノール形についても本発明に含まれる(以下、ケト形のみを記載するが、エノール形も含まれているものとする)。
【0018】
【化7】
Figure 0003585394
【0019】
本発明の前記一般式(1)で表される新規トリカルボニル化合物の好ましい具体例としては、
【0020】
【化8】
Figure 0003585394
【0021】
などがある。
【0022】
本発明の前記一般式(1)で表される化合物は、金属防錆剤として特に有用である。これを金属に適用するにあたっては、一般に溶媒に希釈して用いるのが好ましい。この場合において、溶媒可溶性樹脂(エポキシ樹脂、アクリル樹脂等)、シランカップリング剤や、粘度調整剤、消泡剤、紫外線吸収剤、防腐剤、界面活性剤等を添加してもよい。
【0023】
本発明の防錆剤の溶媒は、水系、溶剤系いずれでもよい。溶剤系としては、メタノール、エタノール、イソプロパノール、トルエン、酢酸エチルなどがある。また、水系の場合には、乳化物として供するのが好ましい。この場合、親水性ポリマーとともに本発明のトリカルボニル化合物を水性乳化物として用いるのがより好ましい。また、本発明のトリカルボニル化合物のエポキシ基にアミンを付加させアミン付加体の水性乳化物として用いることも好ましい。また、本発明のトリカルボニル化合物中の末端二重結合の反応性を利用して、他のビニルモノマーと共重合し乳化させることも好ましい。
【0024】
本発明の金属防錆剤は金属に対して適用されるものであるが、特にアルミニウムおよびアルミニウム合金に対して優れた防錆作用を示す。本発明による金属防錆剤を金属表面に塗布する方法としてはスプレーコート、ディップコート、刷毛塗り、ロールコートなどの公知の塗布方法が適用できる。
【0025】
本発明の防錆剤の効果を十分に引き出すためには塗布後、加熱乾燥することが望ましい。加熱乾燥は100〜230℃で30秒〜60分乾燥することが望ましい。塗布後加熱条件下、水分を除去することにより金属に対する吸着性が高まり、防錆性が向上する。乾燥後の塗布膜の厚みは0.1〜100μmであることが好ましい。より好ましくは0.5〜10μmである。0.1μm未満では十分な防錆性を付与できず、また100μmを越えると均質な塗膜が得られない。
【0026】
【発明の実施の形態】
以下に、本発明の実施例を説明する。
【0027】
実施例1
末端に二重結合を有するトリカルボニル化合物1の合成
塩化マグネシウム41.0g(0.43mol)、塩化メチレン100ml、ピリジン10.2g(0.13mol)を200mlのフラスコに入れ、油温60℃で10分間加熱撹拌後、アセト酢酸メチル50.0g(0.43mol)を添加しさらに油温60℃で30分間加熱撹拌した。次いで10−ウンデセノイルクロリド87.3g(0.43mol)を適下した後、油温60℃で9時間加熱し撹拌した。室温まで冷却した後、水100mlを加え撹拌し有機層を抽出した。溶媒を留去した後、減圧乾燥し、下記式で表される末端に二重結合を有するトリカルボニル化合物の淡黄色液体85.0gを得た。
【0028】
【化9】
Figure 0003585394
【0029】
実施例2
本発明の新規トリカルボニル化合物1の合成
過安息香酸(mCPBA)24g(0.139mol)、塩化メチレン400ml、無水硫酸ナトリウム24gを500mlのナス型フラスコに入れ1分間室温で撹拌後、実施例1で得られたアセト酢酸メチルと10−ウンデセノイルクロリドの反応付加体20g(0.0708mol)を添加し4日間室温で撹拌した。得られた生成物に飽和炭酸水素ナトリウム水溶液300mlを添加し30分間室温で撹拌後、有機層をさらに水で洗浄した。有機層を減圧乾燥して下記式で表される本発明の新規トリカルボニル化合物1の淡黄色液体16gを得た。化合物の同定は、H−NMR(図1)、13C−NMR(図2)、FT−IR(図3)により行った。
【0030】
【化10】
Figure 0003585394
【0031】
実施例3
末端に二重結合を有するトリカルボニル化合物2の合成
塩化マグネシウム6.7g(0.070mol)、塩化メチレン50ml、ピリジン4.3g(0.054mol)を200mlのフラスコに入れ、油温60℃で10分間加熱撹拌後、アリルアセトアセテート10.0g(0.070mol)を添加しさらに油温60℃で10分間加熱撹拌した。次いで10−ウンデセノイルクロリド14.3g(0.070mol)をゆっくりと添加した後、油温60℃で8時間加熱撹拌した。室温まで冷却した後、水100mlを加え撹拌し有機層を抽出した。溶媒を留去した後、減圧乾燥し、下記式で表される末端に二重結合を有するトリカルボニル化合物2の淡黄色液体22.1gを得た。
【0032】
【化11】
Figure 0003585394
【0033】
実施例4
本発明の新規トリカルボニル化合物2の合成
実施例3で得られたアリルアセトアセテートと10−ウンデセノイルクロリドの反応付加体20g(0.0444mol)、過安息香酸(mCPBA)24g(0.139mol)、塩化メチレン400mlを500mlのナス型フラスコに入れ室温で7時間撹拌した。得られた生成物に飽和炭酸水素ナトリウム水溶液300mlを添加し30分間室温で撹拌後、有機層をさらに水で洗浄した。減圧乾燥して下記式で表される本発明の新規トリカルボニル化合物2の淡黄色液体15gを得た。化合物の同定は、H−NMR(図4)、13C−NMR(図5)、FT−IR(図6)により行った。
【0034】
【化12】
Figure 0003585394
【0035】
実施例5
溶剤系金属表面処理剤溶液の調合
エポキシ樹脂(エピコート828:油化シェルエポキシ製)10重量部、特開平6−177535号公報の実施例1に従って合成した下記一般式(5)、(6)、(7)で示されるイミダゾールシラン(R、Rは水素、Rはメチル基、nは3であり、(5)、(6)、(7)の混合比は45:22:33)を1重量部、サリチル酸0.6重量部および実施例2および4で得た新規トリカルボニル化合物1または2を2重量部とり、これにメタノール258.4重量部を加え均一化させ組成物1(新規トリカルボニル化合物1含有)または2(新規トリカルボニル化合物2含有)を得た。
【0036】
【化13】
Figure 0003585394
【0037】
実施例6
水系金属表面処理剤の調合
以下に示す組成の処理液を調合した。
【0038】
組成物3:水溶性エポキシ樹脂(旭電化工業(株)製アデカレジンEM−0434、3倍水希釈物)10重量部、下記の新規トリカルボニル化合
物1乳化物10重量部、前記イミダゾールシラン0.2重量部。
【0039】
1)新規トリカルボニル化合物1乳化物の製造
メチルメタクリレート60g(0.6モル)、イソブチルメタクリレート142.2g(1.0モル)、スチレン15.6g(0.15モル)、ヒドロキシエチルメタクリレート52.1g(0.4モル)、メタクリル酸151.4g(1.76モル)をメチルプロピレングリコール542.5gに溶解し、アゾイソブチロニトリル6.6g(0.04モル)を添加し、85℃で4時間加熱撹拌を行い重合した。得られたアクリル共重合体97.0gに対して実施例2で得られた新規トリカルボニル化合物1、29.0gを100℃で1時間添加混合した。この混合液に29%アンモニア水9.2gを加えた後、純水224gを投入し、強く撹拌することにより新規トリカルボニル化合物1乳化物を得た。
【0040】
組成物4:水溶性エポキシ樹脂(旭電化工業(株)製アデカレジンEM−0436、3倍水希釈物)20重量部、前記イミダゾールシラン10%水溶液(酢酸でpHを5に調整したもの)70重量部、下記の新規トリカルボニル化合物2乳化物10重量部。
【0041】
2)新規トリカルボニル化合物2乳化物の製造
実施例4で得られた新規トリカルボニル化合物2を10g(0.0295モル)に対してジエタノールアミン6.2g(0.059モル)を加え、100℃で1時間反応させトリカルボニルアミン付加物を得た。これに酢酸7.09gを添加し、次いで純水154.8gを投入し、強く撹拌することにより新規トリカルボニル化合物2乳化物を得た。
【0042】
組成物5:水溶性エポキシ樹脂(旭電化工業(株)製アデカレジンEM−0427W、3倍水希釈物)10重量部、前記イミダゾールシラン10%水溶液(酢酸でpHを5に調整したもの)30重量部、新規トリカルボニル化合物2乳化物60重量部。
【0043】
試験片作成条件
サイズ55×55×1のアルミ板(JIS1050)をアルカリ脱脂液(サーフクリーナー:日本ペイント製)を用い前処理した後、スピンコーターを用い乾燥後の膜厚みが約1μmとなるように組成物を塗布し、180℃で10分間熱処理を行い、表面処理アルミ板を作成した。
【0044】
防錆製評価方法
JIS−Z−2371記載の塩水噴霧試験を120時間行った。
【0045】
比較例1:組成物1において新規トリカルボニル化合物1を含まない組成物
比較例2:組成物2において新規トリカルボニル化合物2を含まない組成物
比較例3:組成物3において新規トリカルボニル化合物1乳化物を含まない組成物
比較例4:組成物4において新規トリカルボニル化合物2乳化物を含まない組成物
比較例5:組成物5において新規トリカルボニル化合物2乳化物を含まない組成物
比較例6:未処理アルミ板
【0046】
【表1】
Figure 0003585394
【0047】
【発明の効果】
以上説明したように、本発明による新規トリカルボニル化合物を含有する組成物は金属表面処理剤、特にアルミニウムの表面処理剤として有用なものであり、優れた防錆性を示すものである。
【図面の簡単な説明】
【図1】実施例2で合成された本発明の新規トリカルボニル化合物1のH−NMRチャート。
【図2】同上、13C−NMRチャート。
【図3】同上、FT−IRチャート。
【図4】実施例4で合成された本発明の新規トリカルボニル化合物2のH−NMRチャート。
【図5】同上、13C−NMRチャート。
【図6】同上、FT−IRチャート。[0001]
TECHNICAL FIELD OF THE INVENTION
There are various requirements for the surface of various metal materials, but rust prevention is one of the important characteristics. Steel products are used in various places such as buildings, automobiles, ships, cans and the like, but there is a strong demand for rust prevention. Conventionally, various rust preventive agents such as a water-soluble rust preventive, a vaporizable rust preventive, and an oil-based rust preventive have been used for the rust preventive properties of steel products. Generally, a water-soluble rust inhibitor is intended for temporary short-time rust prevention and is not used for long-term rust prevention. Further, the vaporizable rust preventive exerts its original rust preventive power in a closed state. Oil-based rust preventives have relatively strong rust-proofing ability and withstand long-term rust-proofing. Liquid rust-preventive oil, tacky rust-preventive grease, rust-preventive additives, film-forming agents, etc. are converted to volatile organic solvents. There are dissolved ones. However, rust-preventive oils and rust-preventive greases become sticky after surface treatment and cannot be used as undercoat materials such as coating films. Further, a substance obtained by dissolving a rust preventive additive or a film forming agent in a volatile organic solvent does not exhibit a sufficient rust preventive effect unless the film is made thick.
[0002]
In addition, galvanized steel sheets are commercially available to suppress the rust of iron. This is to prevent the rust of iron by the sacrificial anticorrosive action of zinc, which has a higher ionization tendency than iron. By performing a chemical conversion treatment such as chromate treatment on the zinc layer, white rust of the zinc layer is prevented, and the corrosion resistance is further enhanced. However, although this chromate treatment can provide high rust resistance even with a thin film, a rust-preventive film alternative to this is desired due to environmental problems. At present, tannic acid has been proposed as a rust preventive for galvanized steel sheets, but at present it is not enough compared to chromate treatment.
[0003]
Aluminum or aluminum alloys have attracted attention in various fields due to their light weight. However, since a coating of aluminum oxide is formed on the surface, even if a paint is directly applied to aluminum, its adhesion is not sufficient. Many methods have been proposed as a chemical conversion treatment method for a coating base, and many patents have been published today, but at present, the chromate treatment method is mainly used in the United States and Japan. However, like the above-mentioned galvanized steel sheet, chromate treatment is not environmentally preferable, and non-chromate treatment is desired. Further, a method of treating the metal surface with an aqueous solution of an alkali metal salt of silicic acid for the purpose of imparting properties such as corrosion resistance and antistatic properties has been proposed. The desired properties cannot be obtained unless the acid immersion is performed to remove the alkali metal.
[0004]
[Problems to be solved by the invention]
The present invention can respond to such a demand, that is, a novel tricarbonyl compound and a novel tricarbonyl compound which strongly adsorb to a metal surface, particularly to aluminum, copper, and steel products and have an excellent rust-preventing action even in a thin film. It is an object of the present invention to provide a group-containing acrylic copolymer or a novel tricarbonylamine adduct and a water-soluble metal rust inhibitor using the same.
[0005]
[Means for Solving the Problems]
Means for Solving the Problems As a result of diligent studies, the present inventors have found that a novel tricarbonyl compound represented by the following general formula (1) has an excellent rust-preventing action on a metal surface.
[0006]
The present invention has been made based on such findings, and the gist of the invention is as follows.
(1) a novel tricarbonyl compound represented by the following general formula (1),
[0007]
Embedded image
Figure 0003585394
[0008]
(Wherein, R 1 , R 2 , and R 3 each represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms having a double bond at a terminal, or a carbon number having an epoxy group at a terminal. 2 to 10 alkyl groups, and at least one of R 1 , R 2 , and R 3 is an alkyl group having 2 to 10 carbon atoms and having an epoxy group at a terminal, and x, y, z Represents 0 or 1. The compound also includes an enol type.)
(2) After synthesizing a tricarbonyl compound having a double bond at a terminal by reacting a dicarbonyl compound represented by the following general formula (2) with a compound represented by the general formula (3), A method for producing a novel tricarbonyl compound, comprising producing the epoxy group-containing novel tricarbonyl compound according to (1) by epoxidizing the bond.
[0009]
Embedded image
Figure 0003585394
[0010]
(Wherein, R 1 , R 2 , and R 3 are as defined above, R 4 , R 5 , and R 6 are an alkyl group having 1 to 10 carbon atoms and 2 to 10 carbon atoms having a double bond at a terminal. And at least one of R 4 , R 5 , and R 6 is an alkenyl group having 2 to 10 carbon atoms and having a double bond at a terminal, and x, y, and z are 0. Or 1. The general formulas (1) and (4) also include an enol type.)
(3) a metal rust inhibitor containing the novel tricarbonyl compound according to (1) as an active ingredient;
It is in.
[0011]
The novel tricarbonyl compound of the present invention is obtained by reacting a dicarbonyl compound represented by the general formula (2) with an acid chloride represented by the general formula (3) to form a tricarbonyl compound having a double bond at a terminal. After the synthesis, it can be synthesized by epoxidation.
[0012]
Examples of the compound represented by the general formula (3) used in the above reaction formula include acetyl chloride, propionyl chloride, butyryl chloride, t-butylacetyl chloride, 2-ethylbutyryl chloride, valeryl chloride and isovaleryl chloride. , 2-methylvaleryl chloride, hexanoyl chloride, 2-ethylhexanoyl chloride, heptanoyl chloride, octanoyl chloride, nonanoyl chloride, decanoyl chloride, acrylic acid chloride, and 10-undecenoyl chloride. Further, the carboxylic acid may be acid chlorided with thionyl chloride, phosphorus trichloride, phosphorus pentachloride or the like.
[0013]
The dicarbonyl compound represented by the general formula (2) used in the above reaction formula includes 2,4-pentanedione, 2,2,6,6-tetramethyl-3,5-heptanedione, methyl acetoacetate, and acetoacetic acid. Examples include ethyl, n-butyl acetoacetate, t-butyl acetoacetate, ethyl propionyl acetate, ethyl butyryl acetate, dimethyl malonate, diethyl malonate, allyl acetoacetate, and the like.
The reaction of the above reaction formula is described in literature [M. W. Ratke, P .; J. Cowan, J .; Org. Chem. , 50 , 2622, 1988 or Skarzewski, Tetrahedron, 45 , 4593 (1989)]. That is, a dicarbonyl compound and magnesium chloride are mixed in a reaction solvent to obtain a mixed solution, and the amine and the compound represented by the general formula (3) are sequentially dropped into the mixed solution. Then, after these are dropped, it is preferable to carry out reflux in order to carry out the reaction sufficiently. A reaction time of about 5 minutes to 24 hours is sufficient. As the reaction solvent, methylene chloride, acetonitrile, and the like are preferable. In addition, since this reaction dislikes water, it is preferable to perform the reaction in an atmosphere of a moisture-free substrate such as dry nitrogen or argon so that water does not enter from the gas phase.
[0014]
The compound represented by the general formula (4) includes:
[0015]
Embedded image
Figure 0003585394
[0016]
Embedded image
Figure 0003585394
[0017]
and so on. However, although only the keto form is described, the compound exists as a tautomer of a keto form and an enol form as shown in the following formula, and the enol form is also included in the present invention (hereinafter, keto form) But only the enol form is included).
[0018]
Embedded image
Figure 0003585394
[0019]
Preferred specific examples of the novel tricarbonyl compound represented by the general formula (1) of the present invention include:
[0020]
Embedded image
Figure 0003585394
[0021]
and so on.
[0022]
The compound represented by the general formula (1) of the present invention is particularly useful as a metal rust inhibitor. When applying this to a metal, it is generally preferable to use it after diluting it in a solvent. In this case, a solvent-soluble resin (epoxy resin, acrylic resin, or the like), a silane coupling agent, a viscosity modifier, an antifoaming agent, an ultraviolet absorber, a preservative, a surfactant, or the like may be added.
[0023]
The solvent of the rust preventive of the present invention may be either aqueous or solvent-based. Solvent systems include methanol, ethanol, isopropanol, toluene, ethyl acetate and the like. In the case of an aqueous system, it is preferably provided as an emulsion. In this case, it is more preferable to use the tricarbonyl compound of the present invention as an aqueous emulsion together with the hydrophilic polymer. Further, it is also preferable to add an amine to the epoxy group of the tricarbonyl compound of the present invention and use the resultant as an aqueous emulsion of an amine adduct. It is also preferable to use the reactivity of the terminal double bond in the tricarbonyl compound of the present invention to copolymerize and emulsify with another vinyl monomer.
[0024]
Although the metal rust preventive of the present invention is applied to metals, it exhibits an excellent rust preventive effect particularly on aluminum and aluminum alloys. As a method for applying the metal rust preventive agent according to the present invention to the metal surface, known application methods such as spray coating, dip coating, brush coating, and roll coating can be applied.
[0025]
In order to sufficiently bring out the effects of the rust preventive of the present invention, it is desirable to heat and dry after application. The heat drying is desirably performed at 100 to 230 ° C. for 30 seconds to 60 minutes. By removing moisture under the heating condition after coating, the adsorptivity to metal is increased and the rust prevention is improved. The thickness of the coating film after drying is preferably 0.1 to 100 μm. More preferably, it is 0.5 to 10 μm. If it is less than 0.1 μm, sufficient rust prevention cannot be imparted, and if it exceeds 100 μm, a uniform coating film cannot be obtained.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, examples of the present invention will be described.
[0027]
Example 1
Synthesis of tricarbonyl compound 1 having a double bond at a terminal 41.0 g (0.43 mol) of magnesium chloride, 100 ml of methylene chloride, and 10.2 g (0.13 mol) of pyridine were put into a 200 ml flask, and the oil temperature was lowered. After heating and stirring at 60 ° C. for 10 minutes, 50.0 g (0.43 mol) of methyl acetoacetate was added, and the mixture was further heated and stirred at an oil temperature of 60 ° C. for 30 minutes. Then, after dropping 87.3 g (0.43 mol) of 10-undecenoyl chloride, the mixture was heated and stirred at an oil temperature of 60 ° C. for 9 hours. After cooling to room temperature, 100 ml of water was added and stirred to extract an organic layer. After the solvent was distilled off, the residue was dried under reduced pressure to obtain 85.0 g of a pale yellow liquid of a tricarbonyl compound having a double bond at a terminal represented by the following formula.
[0028]
Embedded image
Figure 0003585394
[0029]
Example 2
Synthesis of novel tricarbonyl compound 1 of the present invention 24 g (0.139 mol) of perbenzoic acid (mCPBA), 400 ml of methylene chloride, and 24 g of anhydrous sodium sulfate were placed in a 500 ml eggplant-shaped flask and stirred at room temperature for 1 minute. 20 g (0.0708 mol) of a reaction adduct of methyl acetoacetate obtained in Example 1 and 10-undecenoyl chloride was added, and the mixture was stirred at room temperature for 4 days. To the obtained product, 300 ml of a saturated aqueous solution of sodium hydrogen carbonate was added, and after stirring at room temperature for 30 minutes, the organic layer was further washed with water. The organic layer was dried under reduced pressure to obtain 16 g of a pale yellow liquid of the novel tricarbonyl compound 1 of the present invention represented by the following formula. The compound was identified by 1 H-NMR (FIG. 1), 13 C-NMR (FIG. 2), and FT-IR (FIG. 3).
[0030]
Embedded image
Figure 0003585394
[0031]
Example 3
Synthesis of tricarbonyl compound 2 having a terminal double bond 6.7 g (0.070 mol) of magnesium chloride, 50 ml of methylene chloride and 4.3 g (0.054 mol) of pyridine were placed in a 200 ml flask, and the oil temperature was lowered. After heating and stirring at 60 ° C. for 10 minutes, 10.0 g (0.070 mol) of allyl acetoacetate was added, and the mixture was further heated and stirred at an oil temperature of 60 ° C. for 10 minutes. Then, 14.3 g (0.070 mol) of 10-undecenoyl chloride was slowly added, and the mixture was heated and stirred at an oil temperature of 60 ° C for 8 hours. After cooling to room temperature, 100 ml of water was added and stirred to extract an organic layer. After the solvent was distilled off, the residue was dried under reduced pressure to obtain 22.1 g of a pale yellow liquid of a tricarbonyl compound 2 having a double bond at a terminal represented by the following formula.
[0032]
Embedded image
Figure 0003585394
[0033]
Example 4
Synthesis of novel tricarbonyl compound 2 of the present invention 20 g (0.0444 mol) of a reaction adduct of allyl acetoacetate obtained in Example 3 and 10-undecenoyl chloride, 24 g of perbenzoic acid (mCPBA) ( 0.139 mol) and 400 ml of methylene chloride were placed in a 500 ml eggplant-shaped flask and stirred at room temperature for 7 hours. To the obtained product, 300 ml of a saturated aqueous solution of sodium hydrogen carbonate was added, and after stirring at room temperature for 30 minutes, the organic layer was further washed with water. After drying under reduced pressure, 15 g of a pale yellow liquid of the novel tricarbonyl compound 2 of the present invention represented by the following formula was obtained. The compound was identified by 1 H-NMR (FIG. 4), 13 C-NMR (FIG. 5), and FT-IR (FIG. 6).
[0034]
Embedded image
Figure 0003585394
[0035]
Example 5
Preparation of solvent-based metal surface treating agent solution 10 parts by weight of epoxy resin (Epicoat 828: manufactured by Yuka Shell Epoxy), the following general formula (5) synthesized according to Example 1 of JP-A-6-177535, Imidazole silanes represented by (6) and (7) (R 1 and R 2 are hydrogen, R is a methyl group, n is 3; the mixing ratio of (5), (6) and (7) is 45:22 : 33), 1 part by weight of salicylic acid and 2 parts by weight of the novel tricarbonyl compound 1 or 2 obtained in Examples 2 and 4, 258.4 parts by weight of methanol were added thereto, and the mixture was homogenized. Compound 1 (containing a novel tricarbonyl compound 1) or 2 (containing a novel tricarbonyl compound 2) was obtained.
[0036]
Embedded image
Figure 0003585394
[0037]
Example 6
Preparation of aqueous metal surface treatment agent A treatment liquid having the following composition was prepared.
[0038]
Composition 3: 10 parts by weight of a water-soluble epoxy resin (ADEKARESIN EM-0434 manufactured by Asahi Denka Kogyo KK, 3 times water dilution), 10 parts by weight of an emulsion of the following novel tricarbonyl compound 1 and 0.2 parts of the imidazole silane 0.2 Parts by weight.
[0039]
1) Production of novel emulsion of tricarbonyl compound 1 60 g (0.6 mol) of methyl methacrylate, 142.2 g (1.0 mol) of isobutyl methacrylate, 15.6 g (0.15 mol) of styrene, 52.1 g of hydroxyethyl methacrylate (0.4 mol), 151.4 g (1.76 mol) of methacrylic acid were dissolved in 542.5 g of methylpropylene glycol, and 6.6 g (0.04 mol) of azoisobutyronitrile was added. Polymerization was performed by heating and stirring for 4 hours. To the obtained acrylic copolymer (97.0 g), 29.0 g of the novel tricarbonyl compound 1 obtained in Example 2 was added and mixed at 100 ° C. for 1 hour. After 9.2 g of 29% aqueous ammonia was added to this mixed solution, 224 g of pure water was added thereto, and the mixture was stirred vigorously to obtain a novel tricarbonyl compound 1 emulsion.
[0040]
Composition 4: 20 parts by weight of a water-soluble epoxy resin (ADEKARESIN EM-0436 manufactured by Asahi Denka Kogyo Co., Ltd., 3 times diluted with water), 70 parts by weight of the 10% aqueous solution of imidazole silane (pH adjusted to 5 with acetic acid) Parts of the following novel tricarbonyl compound 2 emulsion 10 parts by weight.
[0041]
2) Production of novel tricarbonyl compound 2 emulsion 6.2 g (0.059 mol) of diethanolamine was added to 10 g (0.0295 mol) of the novel tricarbonyl compound 2 obtained in Example 4, and the mixture was heated at 100 ° C. The reaction was carried out for 1 hour to obtain a tricarbonylamine adduct. To this, 7.09 g of acetic acid was added, and then 154.8 g of pure water was added, followed by vigorous stirring to obtain a novel tricarbonyl compound 2 emulsion.
[0042]
Composition 5: 10 parts by weight of a water-soluble epoxy resin (ADEKARESIN EM-0427W manufactured by Asahi Denka Kogyo Co., Ltd., 3 times diluted with water), 30 parts by weight of the 10% aqueous solution of imidazole silane (pH adjusted to 5 with acetic acid) Parts, novel tricarbonyl compound 2 emulsion 60 parts by weight.
[0043]
Test piece preparation conditions After pre-treating an aluminum plate (JIS 1050) of size 55 x 55 x 1 using an alkaline degreasing solution (Surf cleaner: Nippon Paint), the film thickness after drying using a spin coater is about The composition was applied to a thickness of 1 μm and heat-treated at 180 ° C. for 10 minutes to prepare a surface-treated aluminum plate.
[0044]
A salt spray test described in Rust Prevention Evaluation Method JIS-Z-2371 was performed for 120 hours.
[0045]
Comparative Example 1: Composition not containing novel tricarbonyl compound 1 in composition 1 Comparative example 2: Composition not containing novel tricarbonyl compound 2 in composition 2 Comparative example 3: Emulsification of novel tricarbonyl compound 1 in composition 3 Comparative Example 4: No Composition: No Composition No. 4 No New Tricarbonyl Compound 2 Emulsion Comparative Example 5: Composition 5: No Composition No New Tricarbonyl Compound 2 Emulsion Comparative Example 6: Untreated aluminum plate [0046]
[Table 1]
Figure 0003585394
[0047]
【The invention's effect】
As described above, the composition containing the novel tricarbonyl compound according to the present invention is useful as a metal surface treatment agent, particularly as a surface treatment agent for aluminum, and exhibits excellent rust prevention.
[Brief description of the drawings]
FIG. 1 is a 1 H-NMR chart of a novel tricarbonyl compound 1 of the present invention synthesized in Example 2.
FIG. 2 is a 13 C-NMR chart of Embodiment 1;
FIG. 3 is an FT-IR chart of Embodiment 1;
FIG. 4 is a 1 H-NMR chart of a novel tricarbonyl compound 2 of the present invention synthesized in Example 4.
FIG. 5 is a 13 C-NMR chart.
FIG. 6 is an FT-IR chart of Embodiment 1;

Claims (3)

下記一般式(1)で表される新規トリカルボニル化合物。
Figure 0003585394
(ただし、式中、R、R、Rは炭素数が1〜10のアルキル基、末端に二重結合を有する炭素数2〜10のアルケニル基、または末端にエポキシ基を有する炭素数2〜10のアルキル基であって、かつ、R、R、Rのうち少なくともいずれか1つは末端にエポキシ基を有する炭素数2〜10のアルキル基であり、x、y、zは0または1を示す。また、該化合物はエノール型も含む。)
A novel tricarbonyl compound represented by the following general formula (1).
Figure 0003585394
(Wherein, R 1 , R 2 , and R 3 each represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms having a double bond at a terminal, or a carbon number having an epoxy group at a terminal. 2 to 10 alkyl groups, and at least one of R 1 , R 2 , and R 3 is an alkyl group having 2 to 10 carbon atoms having an epoxy group at a terminal, and x, y, z Represents 0 or 1. The compound also includes an enol type.)
下記一般式(2)で表されるジカルボニル化合物と一般式(3)で表される化合物とを反応させることにより末端に二重結合を有するトリカルボニル化合物を合成した後、二重結合をエポキシ化させることにより、請求項1記載のエポキシ基含有新規トリカルボニル化合物を製造することを特徴とする、新規トリカルボニル化合物の製造方法。
Figure 0003585394
(ただし、式中、R、R、Rは前記と同義、R、R、Rは炭素数が1〜10のアルキル基、末端に二重結合を有する炭素数2〜10のアルケニル基であって、かつ、R、R、Rのうち少なくともいずれか1つは末端に二重結合を有する炭素数2〜10のアルケニル基であり、x、y、zは0または1を示す。また上記一般式(1)、(4)はエノール型も含む。)
After reacting a dicarbonyl compound represented by the following general formula (2) with a compound represented by the following general formula (3) to synthesize a tricarbonyl compound having a double bond at a terminal, the double bond is epoxy-bonded. A method for producing a novel tricarbonyl compound, comprising producing the novel tricarbonyl compound having an epoxy group according to claim 1 by converting the compound into a tricarbonyl compound.
Figure 0003585394
(Wherein, R 1 , R 2 , and R 3 are as defined above, R 4 , R 5 , and R 6 are an alkyl group having 1 to 10 carbon atoms and 2 to 10 carbon atoms having a double bond at a terminal. And at least one of R 4 , R 5 , and R 6 is an alkenyl group having 2 to 10 carbon atoms and having a double bond at a terminal, and x, y, and z are 0. Or 1. The general formulas (1) and (4) also include an enol type.)
請求項1に記載の新規トリカルボニル化合物を有効成分とする金属防錆剤。A metal rust inhibitor comprising the novel tricarbonyl compound according to claim 1 as an active ingredient.
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