JP3970434B2 - Cleaning agent for resin - Google Patents

Cleaning agent for resin Download PDF

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Publication number
JP3970434B2
JP3970434B2 JP24578098A JP24578098A JP3970434B2 JP 3970434 B2 JP3970434 B2 JP 3970434B2 JP 24578098 A JP24578098 A JP 24578098A JP 24578098 A JP24578098 A JP 24578098A JP 3970434 B2 JP3970434 B2 JP 3970434B2
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Japan
Prior art keywords
cleaning agent
cleaning
component
curable resin
resin
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JP24578098A
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JP2000073093A (en
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久美 佐藤
佳織 北村
武司 河野
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DKS CO. LTD.
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DKS CO. LTD.
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Description

【0001】
【発明の属する技術分野】
本発明は、樹脂吐出装置のミキシング部およびノズル部などに付着した、未硬化状態の2液硬化型樹脂成分用の洗浄剤に関するものである。
【0002】
【従来の技術】
従来、2液硬化型樹脂の吐出装置の洗浄には、塩化メチレンなどのハロゲン化炭化水素類の代替洗浄剤として、セロソルブ類やカルビトール系溶剤類、石油系炭化水素、N−メチル−2ピロリドン、有機酸エステルなどを含む混合系洗浄剤などが用いられている。
【0003】
【発明が解決しようとする課題】
ハロゲン化炭化水素類は、オゾン層を破壊する原因物質として指摘され、その利用に大きく制限がある事が知られており、一部のハロゲン化炭化水素類は人体に対しその安全性に懸念がある。また、前記のごとき様々な代替洗浄剤が使用されているが、石油系炭化水素には引火点が低いものがあり、セロソルブ類やピロリドン系溶剤には人体への安全性が懸念されるので、取扱いに注意を要する。また、セロソルブ類やカルビトール系溶剤は、分子内に水酸基をもつため、ウレタン樹脂のように水酸基と反応するタイプの樹脂に対して硬化阻害を起こす懸念がある。これらの洗浄剤に付随する洗浄後の廃液は、洗浄剤と汚染物質である樹脂液が混在しており、通常、回収されたものは産業廃棄物として処理されるが、揮発性の高い洗浄剤は100%回収するのは難しく、一部回収されずにそのまま大気中に放出される場合が多かった。
【0004】
本発明は、2液硬化型樹脂(特にウレタン樹脂)成分による汚染に対する洗浄性に優れ、係る樹脂成分内に一部混入しても樹脂の硬化阻害の懸念がなく、且つ人体に対して安全で取扱も容易であり、オゾン層破壊物質に該当しない洗浄剤を提供することを目的とし、更に、洗浄後の廃液を蒸留回収して再利用することによって環境汚染の原因である産業廃棄物を減らすことを目的とする。
【0005】
【課題を解決するための手段】
本発明は、この様な従来の問題点に着目してなされたものであって、2液硬化型樹脂成分に混入してもその硬化性に影響が無いよう、分子内に水酸基を含まない各種化合物の中から特定のアセテート化合物を用いれば、前記課題が克服されることに基づき成し遂げられた。
【0006】
また、本発明の洗浄剤は単一化合物よりなる組成であるため、使用後の廃液を単に蒸留処理により回収するだけで、上記用途に再利用が可能となる。
【0007】
未硬化状態の2液硬化型樹脂成分用の洗浄剤であって、該洗浄剤が以下の一般式すなわち、本願第一発明は、未硬化状態の2液硬化型樹脂成分用の洗浄剤であって、該洗浄剤が以下の一般式(1):
【0008】
【化2】

Figure 0003970434
【0009】
[式中、R1は炭素数2〜4のアルキル基、R2は水素原子またはメチル基、nは2〜3の整数を表す]で示される、分子内に水酸基を含まない単一化合物からなる洗浄剤に関する。この化合物は、ウレタン樹脂、エポキシ樹脂、特にウレタン樹脂などの2液硬化型樹脂の未硬化状態の成分による汚染に対する洗浄性に優れており、且つ人体に対して安全で取扱も容易であって、オゾン層破壊物質に該当しない。そして、水酸基を分子内に含まない化合物を用いるので、樹脂吐出装置等における洗浄時にこの化合物が樹脂成分中に混入しても樹脂の硬化阻害をもたらす可能性が極めて少ない。
【0010】
本願第二発明は、本願第一発明における単一化合物が、110℃以上の引火点を有することを特徴とするものである。このように比較的高い引火点を有する化合物を用いると、洗浄や回収の作業従事者が身体に悪影響を及ぼしうる揮発ガスを吸引する可能性が低減され、取扱時に引火、爆発等が惹起こされる危険性も低くなる。
【0011】
本願第三発明は、前記本願第一および第二発明において、前記単一化合物が250℃以下の沸点を有しており、洗浄剤を用いて未硬化状態の2液硬化型樹脂成分を洗浄した後の洗浄剤廃液を蒸留して回収された液体が、未硬化状態の2液硬化型樹脂成分用の洗浄剤として再利用可能であることを特徴とする。このような温度範囲の沸点を有する単一化合物からなる本発明の洗浄剤は、単に所定温度での蒸留を行っただけで回収でき、収率も良好であって、係る蒸留処理に格段のコストや設備を必要としない。回収された洗浄剤は元の洗浄剤と同等の洗浄効果を発揮できるので反復使用も可能であり、従って、環境汚染の原因となる産業廃棄物を減じることにつながる。
【0012】
本願第四発明は、如上の本願発明で、前記化合物が、ジエチレングリコールモノエチルエーテルアセテートまたはジエチレングリコールモノブチルエーテルアセテートであることを特徴とする。これらの化合物を単一成分として含む洗浄剤は、好ましい特性、特に引火点および沸点を有し、これまでに述べてきた本願発明によって達成される効果を好適に成し遂げることができる。
【0013】
本願第五発明は、2液硬化型樹脂の吐出装置のミキシング部およびノズル部などに付着した、未硬化状態の2液硬化型樹脂成分を洗浄するための方法であって、上記洗浄剤を用いて該樹脂吐出装置のミキシング部およびノズル部などを洗浄することを特徴とする洗浄方法に関する。この方法で洗浄を行えば、洗浄剤が2液硬化樹脂成分に混入しても樹脂の硬化阻害などの悪影響を及ぼすことなく、そして洗浄後の廃液は蒸留して回収することができるので、繰り返し使用でき、産業廃棄物量の減少に貢献するものである。
【0014】
【発明の実施の形態】
本発明の洗浄剤が適用対象とする汚染物は、例えば、ウレタン系樹脂、エポキシ系樹脂などの2液硬化型樹脂成分である。
【0015】
本発明の洗浄剤によって、これらの未硬化樹脂成分あるいは混合前の各樹脂成分が付着した、金属部品、ガラス部品または、樹脂吐出装置のミキシング部およびノズル部などが洗浄される。
【0016】
本洗浄剤に用いられる化合物は、炭素数2〜4のアルキル基およびアセチル基で末端を封鎖したアルキレンオキシドすなわち、一般式(1)で示される化合物である。かかる化合物として、具体的にはジエチレングリコールモノエチルエーテルアセテート、ジエチレングリコールモノプロピルエーテルアセテート、ジエチレングリコールモノイソプロピルエーテルアセテート、ジエチレングリコールモノブチルエーテルアセテート、トリエチレングリコールモノエチルエーテルアセテート、トリエチレングリコールモノプロピルエーテルアセテート、トリエチレングリコールモノイソプロピルエーテルアセテート、トリエチレングリコールモノブチルエーテルアセテート、ジプロピレングリコールモノエチルエーテルアセテート、ジプロピレングリコールモノプロピルエーテルアセテート、ジプロピレングリコールモノイソプロピルエーテルアセテート、ジプロピレングリコールモノブチルエーテルアセテート、トリプロピレングリコールモノエチルエーテルアセテート、トリプロピレングリコールモノプロピルエーテルアセテート、トリプロピレングリコールモノイソプロピルエーテルアセテート、トリプロピレングリコールモノブチルエーテルアセテートが挙げられる。
【0017】
これら化合物を組み合わせて使用しても、2液硬化型樹脂の未硬化状態の成分による汚染に対する洗浄性、人体および環境への安全性に優れ、取扱が容易であり、さらに、洗浄剤が樹脂成分中に混入しても樹脂の硬化阻害をもたらす可能性が少ないという本発明の利点は成し遂げられるが、蒸留回収による再利用可能性に鑑み、これらを単独で用いるとよい。この場合、上記化合物のうち、ジエチレングリコールモノエチルエーテルアセテート、ジエチレングリコールモノブチルエーテルアセテートが、引火点、沸点、樹脂成分の洗浄力などの点から最も好ましい。
【0018】
上記一般式で(1)示される化合物について、n=1では引火点が低いため洗浄時や蒸留時の取扱い上の安全性が懸念される他、人体への安全性も懸念される。また、nが4以上の場合には洗浄性が劣るので好ましくない。アルキル基R1の炭素数が5以上になると、引火点は高くなるので人体への危険性や引火、爆発などの可能性は低減されるが、洗浄性は低下してしまい、その上、沸点も高くなるので、蒸留再生時に多大の負荷がかかるために好ましくない。
【0019】
本発明の洗浄剤たる化合物の引火点は、前記したとおり、取扱時の安全性や人体への安全性の点から、110℃以上が好ましく、特に110〜120℃が好ましい。また、この化合物の沸点は、蒸留による回収の容易さ、収率の高さのゆえ、260℃以下が好ましく、特に200〜250℃が好ましい。
【0020】
洗浄剤を回収、再利用するための蒸留は、公知の常法に従って、減圧蒸留法などにより、洗浄剤の成分である化合物の沸点に鑑みて条件を適宜設定して行うとよい。
【0021】
本発明の洗浄剤を用いて洗浄を行う際には、当該洗浄液を常温で使用しても洗浄効果は得られるが、場合により40℃程度まで加温したり、ブラッシング、超音波などの物理的操作を併用することで洗浄性の向上が期待できる。
【0022】
【実施例】
[実験例1]溶解性実験
2液硬化性樹脂であるウレタン系樹脂(第一工業製薬(株)社製、エイムフレックスEF-243)またはエポキシ系樹脂(日本ペルノックス(株)社製、エポキシペルノックスME)のそれぞれの2液を所定の配合比で混合したもの1mlを、以下の表1に示す実施例および比較例に係る各洗浄剤100mlに加えて攪拌し、混合直後の溶解状態を観察した。溶解状態は目視にて評価した。
【0023】
この結果を以下の表1、左欄に示す。
【0024】
【表1】
Figure 0003970434
【0025】
表1に明らかなとおり、本発明の洗浄剤である実施例1および2のジエチレングリコールモノエチルエーテルアセテートやジエチレングリコールモノブチルエーテルアセテートは、エポキシ系樹脂およびウレタン系樹脂の両方に対して良好な溶解性を示した。また、実施例3および4のトリエチレングリコールモノエチルエーテルアセテートやジプロピレングリコールモノエチルエーテルアセテートも、特にウレタン系樹脂に対して良好な溶解性を示し、比較例1〜10の洗浄剤よりも優れた効果を有することが明らかになった。
【0026】
通常、2液硬化性樹脂の吐出装置の洗浄は操業後に行われるが、長時間連続使用すると、洗浄されずに残った残滓が蓄積して、メンテナンスが必要となってしまうケースが多い。従って、本発明の洗浄剤の洗浄力の持続性を確認するために、実験例1におけると同様に、各洗浄剤に2mlのウレタン系の未硬化樹脂成分を加え、攪拌後5日後の溶解状態を観察した。このようにして得られた結果を表1、右欄に示す。本発明の洗浄剤では、5日経過後も継続して溶解または分散しており、洗浄性の持続性が示唆された。この効果は、比較例の洗浄剤を用いた場合よりも格段に優れたものであった。
【0027】
[実験例2]洗浄性実験
ディスペンサーを使用し、実験例1で用いた2液性ウレタン樹脂成分の混合および吐出を、3秒に一回の割合で1時間行った後、表2に示す実施例および比較例に係る各洗浄液を500ml流し、ディスペンサー内部を洗浄した。洗浄後、樹脂液輸送チューブ内を観察して、内部の残存物量から残存状態を評価した。この結果を表2に示す。
【0028】
【表2】
Figure 0003970434
【0029】
表2より明らかなとおり、実施例1および2の洗浄剤は、比較例に係る種々の洗浄剤に比べて残存物量が少なく、洗浄性が良好であった。
【0030】
[実験例3]硬化阻害性実験
2液性ウレタン樹脂(サンユレジン(株)社製UF-820)の樹脂成分液(オリゴマー)15gに、表3に示す各洗浄剤をそれぞれ所定量づつ加え、1分間攪拌後、60℃に加温して硬化させた後の樹脂の状態を観察した。この結果を表3に示す。
【0031】
【表3】
Figure 0003970434
【0032】
表3に示されるとおり、比較例に係る、分子内に水酸基を持つグリコールエーテルに比べて、実施例1および2の洗浄剤は、樹脂の硬化に対する影響が少なかった。従って、かなりの量が樹脂成分に混入しても、本発明の洗浄剤が樹脂硬化の阻害をもたらすことはないことが明らかになった。
【0033】
[実験例4]蒸留再生実験
実験例2と同じ条件で洗浄実験を行い、下記表4に示す本発明の洗浄剤と比較例1および2の洗浄剤において、新液と蒸留再生液で洗浄性を比較した。
【0034】
蒸留再生は、80〜100℃の加温条件下で1.3×106〜2.6×106Paの条件下にて実施し、蒸留後に回収された液体重量から収率を求めた。また、洗浄効果は、目視評価でなく、ディスペンサー内の残存物をエアーブローによって回収後秤量して得られた結果から判定した。これらの結果を表4にまとめた。
【0035】
【表4】
Figure 0003970434
【0036】
表4より、実施例1および2の洗浄剤によれば、蒸留再生液であっても新液と変わらない良好な洗浄性が得られることが判る。比較例14に用いた洗浄剤は、蒸留特性が相違する2種の化合物の混合物であるため、蒸留後の洗浄剤組成が新液の状態とは異なってしまい、ジエチレングリコールモノエチルエーテルアセテートが50重量%から65.7重量%に増加し、ジプロピレングリコールモノメチルエーテルが50重量%から34.3重量%に減少していた。そして、この蒸留再生液の洗浄性は新液より劣っていた。また、比較例15の洗浄剤は、沸点が250℃を越えるものであり、実施例と同じ前記蒸留条件では蒸留が行えなかった。よって、再生液の洗浄性は評価できなかった。
【0037】
【発明の効果】
以上説明したように、本発明のうち請求項1記載の発明は、2液硬化型樹脂の未硬化状態の成分による汚染に対する洗浄性に優れており、且つ人体に対して安全で取扱も容易であって、オゾン層破壊物質に該当しない。そして、水酸基を分子内に含まない化合物を用いているので、樹脂吐出装置等における洗浄時にこの化合物が樹脂成分中に混入しても硬化阻害をもたらす可能性が極めて少ない。
【0038】
請求項2記載の発明は、洗浄や回収の作業従事者が身体に悪影響を及ぼしうる揮発ガスを吸引する可能性がさらに低く、取扱時に引火、爆発等が惹起こされる危険性も低いものである。
【0039】
請求項3記載の発明は、所定温度での蒸留を行っただけで洗浄剤を回収でき、収率も良好であって、係る蒸留処理に格段のコストや設備を必要としない点において有利である。回収された洗浄剤は元の洗浄剤と同等の洗浄効果を発揮できるので反復使用も可能であり、従って、環境汚染の原因となる産業廃棄物を減じることにつながる。
【0040】
請求項4記載の発明により、特に如上の効果を好適に成し遂げることができる。
【0041】
請求項5記載の発明によって、2液硬化樹脂成分に混入しても樹脂の硬化阻害などの悪影響を及ぼすことなく、そして洗浄後の廃液は蒸留して回収することができるので、繰り返し使用でき、産業廃棄物量の減少に貢献することができる、樹脂の吐出装置のミキシング部およびノズル部などに付着した未硬化状態の2液硬化型樹脂成分を効率よく洗浄することができる方法が提供される。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cleaning agent for a two-component curable resin component in an uncured state attached to a mixing unit and a nozzle unit of a resin discharge device.
[0002]
[Prior art]
Conventionally, for cleaning of a two-part curable resin discharge device, cellosolves, carbitol solvents, petroleum hydrocarbons, N-methyl-2-pyrrolidone are used as alternative cleaning agents for halogenated hydrocarbons such as methylene chloride. In addition, mixed detergents containing organic acid esters and the like are used.
[0003]
[Problems to be solved by the invention]
Halogenated hydrocarbons have been pointed out as a causative substance that destroys the ozone layer, and it is known that their use is greatly limited. Some halogenated hydrocarbons are concerned about the safety of the human body. is there. In addition, various alternative cleaning agents such as those mentioned above are used, but some petroleum-based hydrocarbons have low flash points, and cellosolves and pyrrolidone-based solvents are concerned about safety to the human body. Handle with care. In addition, cellosolves and carbitol solvents have hydroxyl groups in the molecule, and therefore there is a concern that curing inhibition may occur for a resin that reacts with hydroxyl groups such as urethane resins. The waste liquid after cleaning associated with these cleaning agents is a mixture of the cleaning agent and the resin liquid that is a contaminant. Usually, the collected waste is treated as industrial waste, but it is a highly volatile cleaning agent. It was difficult to recover 100%, and in many cases it was released into the atmosphere without being partially recovered.
[0004]
The present invention has excellent detergency against contamination by a two-component curable resin (particularly urethane resin) component, and there is no concern about inhibition of curing of the resin even if it is partially mixed in the resin component, and is safe for the human body. The purpose is to provide a cleaning agent that is easy to handle and does not fall under the ozone-depleting substances, and further reduces industrial waste that causes environmental pollution by distilling and recovering the waste liquid after cleaning. For the purpose.
[0005]
[Means for Solving the Problems]
The present invention has been made paying attention to such a conventional problem, and various kinds of compounds that do not contain a hydroxyl group in the molecule so as not to affect the curability even if mixed in the two-component curable resin component. The use of a specific acetate compound among the compounds has been accomplished on the basis of overcoming the above problems.
[0006]
Moreover, since the cleaning agent of the present invention has a composition composed of a single compound, it can be reused for the above-mentioned purposes simply by recovering the used liquid after distillation.
[0007]
A cleaning agent for an uncured two-component curable resin component, wherein the cleaning agent has the following general formula, that is, the first invention of the present application is a cleaning agent for an uncured two-component curable resin component. The cleaning agent has the following general formula (1):
[0008]
[Chemical 2]
Figure 0003970434
[0009]
[Wherein R 1 represents an alkyl group having 2 to 4 carbon atoms, R 2 represents a hydrogen atom or a methyl group, and n represents an integer of 2 to 3], and a single compound containing no hydroxyl group in the molecule. Relates to a cleaning agent. This compound has excellent cleaning properties against contamination by uncured components of two-component curable resins such as urethane resins, epoxy resins, and particularly urethane resins, and is safe for the human body and easy to handle, Not applicable to ozone depleting substances. And since the compound which does not contain a hydroxyl group in a molecule | numerator is used, even if this compound mixes in a resin component at the time of washing | cleaning in a resin discharge apparatus etc., there is very little possibility of causing hardening of resin.
[0010]
The second invention of the present application is characterized in that the single compound in the first invention of the present application has a flash point of 110 ° C. or higher. If a compound having a relatively high flash point is used in this way, the possibility of inhaling volatile gases that can adversely affect the body of workers who perform cleaning and recovery is reduced, and ignition, explosion, etc. are caused during handling. Risk is also reduced.
[0011]
The third invention of the present application is the first and second inventions of the present application, wherein the single compound has a boiling point of 250 ° C. or lower, and a two-component curable resin component in an uncured state is washed with a cleaning agent. The liquid recovered by distilling the subsequent cleaning agent waste liquid is reusable as a cleaning agent for an uncured two-component curable resin component. The cleaning agent of the present invention consisting of a single compound having a boiling point in such a temperature range can be recovered simply by performing distillation at a predetermined temperature, has a good yield, and is extremely expensive for such distillation treatment. And no equipment is required. Since the recovered cleaning agent can exhibit the same cleaning effect as the original cleaning agent, it can be used repeatedly, thus reducing industrial waste that causes environmental pollution.
[0012]
A fourth invention of the present application is the invention of the present application as described above, wherein the compound is diethylene glycol monoethyl ether acetate or diethylene glycol monobutyl ether acetate. The cleaning agent containing these compounds as a single component has favorable characteristics, particularly flash point and boiling point, and can preferably achieve the effects achieved by the present invention described so far.
[0013]
A fifth invention of the present application is a method for cleaning an uncured two-component curable resin component adhering to a mixing unit and a nozzle unit of a two-component curable resin discharge device, using the above-described cleaning agent In particular, the present invention relates to a cleaning method for cleaning a mixing portion and a nozzle portion of the resin discharge device. If washing is carried out in this way, even if the detergent is mixed into the two-part curable resin component, there is no adverse effect such as inhibition of resin hardening, and the waste liquid after washing can be recovered by distillation. It can be used and contributes to the reduction of industrial waste.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Contaminants to which the cleaning agent of the present invention is applied are, for example, two-component curable resin components such as urethane resins and epoxy resins.
[0015]
With the cleaning agent of the present invention, the metal part, the glass part, the mixing part and the nozzle part of the resin discharge device, etc., to which these uncured resin components or the respective resin components before mixing adhere, are cleaned.
[0016]
The compound used in the present cleaning agent is an alkylene oxide having a terminal end blocked with an alkyl group having 2 to 4 carbon atoms and an acetyl group, that is, a compound represented by the general formula (1). Specific examples of such compounds include diethylene glycol monoethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monoisopropyl ether acetate, diethylene glycol monobutyl ether acetate, triethylene glycol monoethyl ether acetate, triethylene glycol monopropyl ether acetate, triethylene glycol. Monoisopropyl ether acetate, triethylene glycol monobutyl ether acetate, dipropylene glycol monoethyl ether acetate, dipropylene glycol monopropyl ether acetate, dipropylene glycol monoisopropyl ether acetate, dipropylene glycol monobutyl ether acetate , Tripropylene glycol monoethyl ether acetate, tripropylene glycol monopropyl ether acetate, tripropylene glycol monoisopropyl ether acetate, tripropylene glycol monobutyl ether acetate.
[0017]
Even if these compounds are used in combination, they are excellent in cleanability against contamination caused by uncured components of the two-component curable resin, are safe for humans and the environment, are easy to handle, and the cleaning agent is a resin component. Although the advantage of the present invention is achieved that there is little possibility of causing the resin to be hardened even if it is mixed in, it is preferable to use these alone in view of the possibility of reuse by distillation recovery. In this case, among the above compounds, diethylene glycol monoethyl ether acetate and diethylene glycol monobutyl ether acetate are most preferable from the viewpoints of flash point, boiling point, detergency of resin components, and the like.
[0018]
With regard to the compound represented by the general formula (1), since the flash point is low at n = 1, there are concerns about the safety in handling during washing and distillation, as well as the safety to the human body. Further, when n is 4 or more, the cleaning property is inferior, which is not preferable. When the carbon number of the alkyl group R 1 is 5 or more, the flash point becomes high, so the danger to the human body and the possibility of fire, explosion, etc. are reduced, but the detergency is reduced, and the boiling point is also increased. Therefore, it is not preferable because a great load is applied during the distillation regeneration.
[0019]
As described above, the flash point of the compound serving as the cleaning agent of the present invention is preferably 110 ° C. or higher, and particularly preferably 110 to 120 ° C. from the viewpoint of safety during handling and safety to the human body. Moreover, the boiling point of this compound is preferably 260 ° C. or less, particularly preferably 200 to 250 ° C., because of the ease of recovery by distillation and the high yield.
[0020]
The distillation for recovering and reusing the cleaning agent may be carried out by appropriately setting the conditions in accordance with a publicly known conventional method, using a vacuum distillation method or the like in view of the boiling point of the compound that is a component of the cleaning agent.
[0021]
When cleaning with the cleaning agent of the present invention, the cleaning effect can be obtained even if the cleaning liquid is used at room temperature. However, in some cases, the cleaning liquid may be heated to about 40 ° C. Improved cleaning performance can be expected by using the operation together.
[0022]
【Example】
[Experimental Example 1] Solubility Experiment 2 Urethane resin (Daiichi Kogyo Seiyaku Co., Ltd., Aimflex EF-243) or epoxy resin (Nihon Pernox Co., Ltd. 1 ml of each of the two liquids of Knox ME) mixed at a predetermined blending ratio is added to 100 ml of each of the cleaning agents according to the examples and comparative examples shown in Table 1 below, and the dissolved state immediately after mixing is observed. did. The dissolved state was visually evaluated.
[0023]
The results are shown in Table 1, left column below.
[0024]
[Table 1]
Figure 0003970434
[0025]
As is apparent from Table 1, the diethylene glycol monoethyl ether acetate and diethylene glycol monobutyl ether acetate of Examples 1 and 2, which are the cleaning agents of the present invention, exhibit good solubility in both epoxy resins and urethane resins. It was. In addition, triethylene glycol monoethyl ether acetate and dipropylene glycol monoethyl ether acetate of Examples 3 and 4 also show good solubility particularly for urethane resins, and are superior to the cleaning agents of Comparative Examples 1-10. It became clear that it had the effect.
[0026]
Usually, cleaning of the two-component curable resin discharge device is performed after operation, but if used continuously for a long time, the residue remaining without being cleaned often accumulates and maintenance is often required. Therefore, in order to confirm the durability of the cleaning power of the cleaning agent of the present invention, as in Experimental Example 1, 2 ml of urethane-based uncured resin component was added to each cleaning agent, and the dissolved state after 5 days after stirring. Was observed. The results thus obtained are shown in Table 1, right column. In the cleaning agent of the present invention, it was dissolved or dispersed continuously even after 5 days, suggesting the durability of the cleaning property. This effect was much better than when the cleaning agent of the comparative example was used.
[0027]
[Experimental Example 2] Using the cleaning experiment dispenser, the mixing and discharging of the two-component urethane resin component used in Experimental Example 1 were performed at a rate of once every 3 seconds for 1 hour, and then performed as shown in Table 2. 500 ml of each cleaning liquid according to the example and the comparative example was flowed to clean the inside of the dispenser. After washing, the inside of the resin liquid transport tube was observed, and the remaining state was evaluated from the amount of residual matter inside. The results are shown in Table 2.
[0028]
[Table 2]
Figure 0003970434
[0029]
As is clear from Table 2, the cleaning agents of Examples 1 and 2 had a small residual amount and good cleaning properties as compared with various cleaning agents according to Comparative Examples.
[0030]
[Experimental Example 3] Curing Inhibitory Experiment 2 A predetermined amount of each cleaning agent shown in Table 3 was added to 15 g of a resin component liquid (oligomer) of a two-component urethane resin (UF-820 manufactured by Sanyu Resin Co., Ltd.). After stirring for a minute, the state of the resin after being cured by heating to 60 ° C. was observed. The results are shown in Table 3.
[0031]
[Table 3]
Figure 0003970434
[0032]
As shown in Table 3, compared with the glycol ether having a hydroxyl group in the molecule according to the comparative example, the cleaning agents of Examples 1 and 2 had less influence on the curing of the resin. Accordingly, it has been clarified that the cleaning agent of the present invention does not inhibit the resin curing even if a considerable amount is mixed in the resin component.
[0033]
[Experimental Example 4] A washing experiment was performed under the same conditions as in the distillation regeneration experiment example 2, and in the cleaning agent of the present invention and the cleaning agents of comparative examples 1 and 2 shown in Table 4 below, the washing performance with the new solution and the distillation regeneration solution was used. Compared.
[0034]
Distillation regeneration was performed under the conditions of 1.3 × 10 6 to 2.6 × 10 6 Pa under heating conditions of 80 to 100 ° C., and the yield was determined from the weight of the liquid recovered after distillation. Further, the cleaning effect was determined not by visual evaluation but by the result obtained by weighing the residue in the dispenser after recovery by air blow. These results are summarized in Table 4.
[0035]
[Table 4]
Figure 0003970434
[0036]
From Table 4, it can be seen that according to the cleaning agents of Examples 1 and 2, good cleaning properties that are the same as the new solution can be obtained even with the distilled regenerated solution. Since the cleaning agent used in Comparative Example 14 is a mixture of two types of compounds having different distillation characteristics, the cleaning agent composition after distillation differs from the state of the new solution, and diethylene glycol monoethyl ether acetate is 50 wt. % To 65.7% by weight and dipropylene glycol monomethyl ether was reduced from 50% to 34.3% by weight. And the washing | cleaning property of this distillation reproduction | regeneration liquid was inferior to a new liquid. Further, the cleaning agent of Comparative Example 15 had a boiling point exceeding 250 ° C., and distillation could not be performed under the same distillation conditions as in the examples. Therefore, the washability of the regenerated liquid could not be evaluated.
[0037]
【The invention's effect】
As described above, the invention according to claim 1 of the present invention is excellent in cleaning performance against contamination by uncured components of the two-part curable resin, and is safe for the human body and easy to handle. Therefore, it does not fall under the ozone depleting substance. And since the compound which does not contain a hydroxyl group in a molecule | numerator is used, even if this compound mixes in a resin component at the time of washing | cleaning in a resin discharge apparatus etc., there is very little possibility of causing hardening inhibition.
[0038]
According to the second aspect of the present invention, there is a lower possibility that a worker engaged in cleaning and recovery will suck volatile gas that may adversely affect the body, and there is also a low risk of causing ignition, explosion, etc. during handling. .
[0039]
The invention according to claim 3 is advantageous in that the cleaning agent can be recovered only by performing distillation at a predetermined temperature, the yield is good, and the distillation process does not require much cost and equipment. . Since the recovered cleaning agent can exhibit the same cleaning effect as the original cleaning agent, it can be used repeatedly, thus reducing industrial waste that causes environmental pollution.
[0040]
According to the invention of the fourth aspect, the above effects can be particularly preferably achieved.
[0041]
According to the invention of claim 5, even if mixed into the two-component curable resin component without adverse effects such as resin curing inhibition, and the waste liquid after washing can be recovered by distillation, can be used repeatedly, Provided is a method capable of efficiently cleaning an uncured two-component curable resin component adhering to a mixing unit and a nozzle unit of a resin discharge device, which can contribute to a reduction in the amount of industrial waste.

Claims (5)

未硬化状態の2液硬化型樹脂成分用の洗浄剤であって、該洗浄剤が以下の一般式(1):
Figure 0003970434
[式中、R1は炭素数2〜4のアルキル基、R2は水素原子またはメチル基、nは2〜3の整数を表す]で示される、分子内に水酸基を含まない単一化合物からなる洗浄剤。
A cleaning agent for an uncured two-component curable resin component, wherein the cleaning agent has the following general formula (1):
Figure 0003970434
[Wherein R 1 represents an alkyl group having 2 to 4 carbon atoms, R 2 represents a hydrogen atom or a methyl group, and n represents an integer of 2 to 3], and a single compound containing no hydroxyl group in the molecule. A cleaning agent.
前記単一化合物が、110℃以上の引火点を有する請求項1記載の洗浄剤。The cleaning agent according to claim 1, wherein the single compound has a flash point of 110 ° C. or higher. 前記単一化合物が、250℃以下の沸点を有し、洗浄剤を用いて未硬化状態の2液硬化型樹脂成分を洗浄した後の洗浄剤廃液を蒸留して回収された液体が、未硬化状態の2液硬化型樹脂成分用の洗浄剤として再利用可能である請求項1または2記載の洗浄剤。The single compound has a boiling point of 250 ° C. or lower, and the liquid recovered by distilling the cleaning agent waste liquid after cleaning the uncured two-component curable resin component with the cleaning agent is uncured. The cleaning agent according to claim 1 or 2, which can be reused as a cleaning agent for a two-component curable resin component in a state. 前記化合物が、ジエチレングリコールモノエチルエーテルアセテートまたはジエチレングリコールモノブチルエーテルアセテートである請求項1乃至3のいずれかに記載の洗浄剤。The cleaning agent according to any one of claims 1 to 3, wherein the compound is diethylene glycol monoethyl ether acetate or diethylene glycol monobutyl ether acetate. 2液硬化型樹脂の吐出装置のミキシング部およびノズル部などに付着した、未硬化状態の2液硬化型樹脂成分を洗浄するための方法であって、請求項1乃至4のいずれかに記載の洗浄剤を用いて該樹脂吐出装置のミキシング部およびノズル部などを洗浄することを特徴とする洗浄方法。5. A method for cleaning an uncured two-component curable resin component adhering to a mixing portion and a nozzle portion of a two-component curable resin discharge device, according to claim 1. A cleaning method comprising cleaning a mixing portion and a nozzle portion of the resin discharge device using a cleaning agent.
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