JP2014159523A - Detergent composition for removing polyamideimide resin - Google Patents
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本発明はポリアミドイミド樹脂除去用の洗浄剤組成物に関し、より詳しくは、内燃機関を構成するピストン等の摺動部位において、潤滑被膜形成に使用されるポリアミドイミド樹脂を含有する潤滑塗料を除去するのに用いる洗浄剤に関する。 The present invention relates to a cleaning composition for removing a polyamide-imide resin, and more specifically, removes a lubricating paint containing a polyamide-imide resin used for forming a lubricating coating at a sliding portion such as a piston constituting an internal combustion engine. The present invention relates to a cleaning agent used in
内燃機関を構成するピストン等の摺動部位は金属の摩耗を防ぐために、潤滑被膜で覆われた構造をしており、潤滑塗料を塗布、加熱処理を行うことで潤滑被膜が形成される。潤滑塗料は固体潤滑剤と結合剤で構成されており、固体潤滑剤は低摩擦係数、高耐摩耗性実現する役割を果たし、ポリテトラフルオロエチレン、二硫化モリブデン、グラファイトが一般的に使用されている。一方、結合剤は固体潤滑剤粒子間、固体潤滑粒子と金属間を結合する事で摺動により脱落するのを抑制する役割を果たし、有機化合物の中では耐熱性、耐久性、潤滑性に優れているポリアミドイミド樹脂が一般的に使用されている（特許文献１）。 A sliding portion such as a piston constituting the internal combustion engine has a structure covered with a lubricating coating in order to prevent metal wear, and the lubricating coating is formed by applying a lubricating paint and performing a heat treatment. Lubricating paint is composed of solid lubricant and binder. Solid lubricant plays a role in realizing low coefficient of friction and high wear resistance, and polytetrafluoroethylene, molybdenum disulfide, and graphite are commonly used. Yes. On the other hand, the binder plays the role of suppressing the falling off by sliding by bonding between the solid lubricant particles and between the solid lubricant particles and the metal, and is excellent in heat resistance, durability and lubricity among organic compounds. Polyamideimide resin is generally used (Patent Document 1).
潤滑塗料の塗布工程では、摺動部のみに潤滑塗料を位置選択的に塗布するためにテフロン（登録商標）、アルミニウム等の材質のマスキング冶具が一般的に使用されている。マスキング冶具に付着した不要な潤滑塗料は、洗浄剤を用いて除去し、マスキング冶具は繰り返し使用されている。 In the step of applying the lubricating paint, a masking jig made of a material such as Teflon (registered trademark) or aluminum is generally used in order to selectively apply the lubricating paint to only the sliding portion. Unnecessary lubricating paint adhering to the masking jig is removed using a cleaning agent, and the masking jig is used repeatedly.
潤滑塗料の結合剤であるポリアミドイミド樹脂は優れた耐熱性、耐久性を示す反面、これらの樹脂は一般の有機溶剤に溶解し難い性質を持つ。従って、モリブデンペースト等の潤滑塗料のマスキング冶具の洗浄の分野において、従来は樹脂溶解力に優れた１−メチル−２ピロリドン（ＮＭＰ）が一般的に洗浄剤として使用されていた。しかしながら、ＮＭＰは、刺激臭が強く作業環境上取り扱いにくい。また、２００２年に日本産業衛生学会から、ＮＭＰの人体への安全性に関して、生殖毒性、催奇形性を有する、などの理由で、作業環境許容濃度１ｐｐｍという極めて低い濃度が提案され、ＮＭＰの作業環境の制約が厳しくなり、取り扱い難いものとなった（特許文献２）。アメリカおよびカナダでは、ＮＭＰはＰＲＴＲ（化学物質排出移動量届出制度）の対象物質に指定されている。さらに、ＲＥＡＣＨ規制の高懸念物質リスト第５次リストにＮＭＰが登録され（２０１１年５月３１日）、ＮＭＰにとって代わる洗浄剤の要求が大きい。 Polyamideimide resins, which are binders for lubricating coatings, exhibit excellent heat resistance and durability, but these resins are difficult to dissolve in common organic solvents. Accordingly, in the field of cleaning of masking jigs for lubricating paint such as molybdenum paste, 1-methyl-2-pyrrolidone (NMP), which has excellent resin dissolving power, has been generally used as a cleaning agent. However, NMP has a strong pungent odor and is difficult to handle in the work environment. In 2002, the Japan Society for Occupational Health proposed an extremely low concentration of 1 ppm for work environment, because of the reproductive toxicity and teratogenicity of NMP safety to the human body. Environmental restrictions have become severe, making handling difficult (Patent Document 2). In the United States and Canada, NMP is designated as a substance subject to PRTR (Chemical Release and Transfer Notification System). Furthermore, NMP is registered in the fifth list of substances of very high concern under REACH regulations (May 31, 2011), and there is a great demand for cleaning agents that can replace NMP.
このようなＮＭＰを含有しないポリイミド樹脂、ポリアミド樹脂、ポリアミドイミド樹脂を除去する一般的な洗浄液として、水酸化テトラメチルアンモニウム、水酸化テトラエチルアンモニウム等のアルカリ系化合物（特許文献３）、エチ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メチルエーテル等のグリコールエーテル系化合物（特許文献４）、Ｎ，Ｎ−ジメチルホルムアミド（ＤＭＦ）、Ｎ，Ｎ−ジメチルアセトアミド（ＤＭＡｃ）、ジメチルスルホキシド（ＤＭＳＯ）等の極性溶剤系化合物（特許文献５）が挙げられる。しかしながら、これらの洗浄液はＲＥＡＣＨ規制等の環境基準の達成、高品位な洗浄性、良好な作業性について、一部を満足させる事はできても、すべてを満足できるものではなく、それぞれ以下に示す課題が残っている。 As a general cleaning liquid for removing such polyimide resin, polyamide resin and polyamideimide resin not containing NMP, alkaline compounds such as tetramethylammonium hydroxide and tetraethylammonium hydroxide (Patent Document 3), ethylene glycol monomethyl ether , Glycol ether compounds such as propylene glycol monomethyl ether (Patent Document 4), polar solvent compounds such as N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAc), dimethyl sulfoxide (DMSO), etc. Reference 5) may be mentioned. However, these cleaning liquids can satisfy some of the achievement of environmental standards such as REACH regulations, high-grade cleaning properties, and good workability, but not all of them. Issues remain.
まず、アルカリ系化合物はアルミニウム等のアルカリに弱い金属に対して腐食を引き起こす事が知られており、マスキング冶具等の金属素材が腐食する恐れがある。さらに、アルカリ性の洗浄液は廃棄する際に中和処理が必要なため、設備コスト、作業コストが増大するので、作業性に問題がある。次に、グリコールエーテル系化合物は化学的中性であるため、アルカリ系化合物と比較して作業性が良好である。しかし、ポリイミド樹脂、ポリアミド樹脂、ポリアミドイミド樹脂に対する溶解力が十分ではなく、高品位な洗浄性が達成できない。続いて、極性溶剤系化合物は化学的中性であり、ポリアミドイミド樹脂に対する溶解性が高い。しかしながら、これらの溶剤の多くは毒性が高い事が報告されており、安全性に課題が残る。例えば、ＤＭＡｃは生殖毒性有するなどの理由で、ＲＥＡＣＨ規制の高懸念物質リスト第６次リスト（２０１１年１２月１９日）に登録され、ＤＭＦはＧＨＳ分類による発がん性が区分１Ｂ、生殖毒性が区分１Ｂに分類される。また、ＤＭＳＯは熱に不安定であり、長期間使用すると分解する恐れがある。作業者の安全性を確保する観点から、これらの毒性の高い物質の使用は望ましくない。従って、これらの洗浄液はＲＥＡＣＨ規制等の環境基準の達成、高品位な洗浄性、良好な作業性のすべてを満足できるものではない。 First, it is known that alkaline compounds cause corrosion to alkali-sensitive metals such as aluminum, which may corrode metal materials such as masking jigs. Furthermore, since the alkaline cleaning liquid needs to be neutralized when it is discarded, the equipment cost and the work cost increase, so that there is a problem in workability. Next, since glycol ether compounds are chemically neutral, workability is better than that of alkali compounds. However, the dissolving power with respect to the polyimide resin, polyamide resin, and polyamideimide resin is not sufficient, and high-quality detergency cannot be achieved. Subsequently, the polar solvent-based compound is chemically neutral and has high solubility in the polyamideimide resin. However, it has been reported that many of these solvents are highly toxic, and a problem remains in safety. For example, because DMAc has reproductive toxicity, it is registered in the 6th list of substances of high concern (12/19/2011) under the REACH regulation, and DMF is classified as Category 1B for carcinogenicity by GHS classification and Category 2 Classified as 1B. Also, DMSO is unstable to heat and may be decomposed when used for a long time. From the viewpoint of ensuring worker safety, the use of these highly toxic substances is not desirable. Therefore, these cleaning liquids do not satisfy all of the achievement of environmental standards such as REACH regulations, high-quality cleaning performance, and good workability.
本発明は、ＲＥＡＣＨ規制等の環境基準を達成し、化学的中性でありながら高品位な洗浄性を有し、しかも臭気、引火性などの作業性の観点においても優れたポリアミドイミド樹脂除去用の洗浄剤組成物を提供することを目的とする。 The present invention achieves environmental standards such as REACH regulations, has high-quality detergency while being chemically neutral, and is excellent in terms of workability such as odor and flammability, for removing polyamideimide resin An object of the present invention is to provide a cleaning composition.
本発明者らは上記課題を達成すべく鋭意検討を重ねた結果、以下の特定組成の洗浄剤組成物を用いることにより、課題を解決しうることを見出した。すなわち本発明は、（Ａ）６０〜９０重量％の１，３−ジメチル−２−イミダゾリジノン（以下、（Ａ）成分という）、（Ｂ）５〜３０重量％の下記一般式（１）で表されるアルキレンオキサイド化合物（以下、（Ｂ）成分という）、及び（Ｃ）５〜１０重量％の水（以下、（Ｃ）成分という）を含有することを特徴とするポリアミドイミド樹脂除去用洗浄剤組成物である（本発明１）。
本発明２は、本発明１における洗浄剤組成物が、ポリアミドイミド樹脂含有潤滑塗料除去用であるポリアミドイミド樹脂除去用の洗浄剤組成物である。 Invention 2 is a cleaning composition for removing polyamideimide resin, wherein the cleaning composition in Invention 1 is for removing polyamideimide resin-containing lubricating paint.
本発明３は、本発明２における洗浄剤組成物が、モリブデンペーストであるポリアミドイミド樹脂除去用の洗浄剤組成物である。 The present invention 3 is a cleaning composition for removing polyamide-imide resin in which the cleaning composition in the present invention 2 is a molybdenum paste.
本発明によれば、本発明の洗浄剤組成物は、ＮＭＰ等の有害性物質を含まないため、安全性が高く、ＲＥＡＣＨ規制に対応している。さらに、ポリアミドイミド樹脂に対して、優れた洗浄性を有する。更に、本発明の洗浄剤組成物は化学的中性であるため、マスキング冶具の素材に対して腐食を引き起こす事が無い。また、廃棄時に中和処理が不要であり、引火性、すすぎ性、臭気などの作業性の点でも優れている。 According to the present invention, since the cleaning composition of the present invention does not contain harmful substances such as NMP, it is highly safe and complies with REACH regulations. Furthermore, it has excellent detergency with respect to polyamideimide resin. Furthermore, since the cleaning composition of the present invention is chemically neutral, it does not cause corrosion to the material of the masking jig. Further, neutralization is not required at the time of disposal, and the workability such as flammability, rinsing property and odor is excellent.
本発明のポリアミドイミド樹脂用の洗浄剤組成物は、組成物全体を１００重量％としたときに、（Ａ）成分を６０〜９０重量％、（Ｂ）成分を５〜３０重量％、（Ｃ）成分を５〜１０重量％含有するものである。 The cleaning composition for the polyamide-imide resin of the present invention has a component (A) of 60 to 90% by weight, component (B) of 5 to 30% by weight, and (C ) The component is contained in an amount of 5 to 10% by weight.
本発明の（Ａ）成分の配合量は６０〜９０重量％である。６０重量％未満であると、樹脂汚れの洗浄性が十分に発揮できず、９０重量％を超えると、洗浄剤組成物の融点が上昇して、低温環境下において凍結しやすくなり、作業性の点で問題がある。 The compounding quantity of (A) component of this invention is 60 to 90 weight%. If it is less than 60% by weight, the resin stains cannot be sufficiently cleaned. If it exceeds 90% by weight, the melting point of the cleaning composition increases, and it becomes easy to freeze in a low temperature environment. There is a problem in terms.
上記（Ｂ）成分の配合量は５〜３０重量％である。５重量％未満であると、洗浄剤組成物の融点が上昇して低温環境下において凍結しやすくなり、作業性の点で問題がある。３０重量％を超えると、樹脂汚れの洗浄性が十分に発揮できない。 The blending amount of the component (B) is 5 to 30% by weight. If it is less than 5% by weight, the melting point of the cleaning composition increases, and it becomes easy to freeze in a low temperature environment, which is problematic in terms of workability. If it exceeds 30% by weight, the resin stains cannot be sufficiently cleaned.
上記（Ｂ）成分は、一般式（１）で表されるアルキレンオキサイド化合物であれば、特に限定されない。一般式（１）中、Ｒ１は３〜５のアルキレン基である。Ｒ１の炭素数が３未満であると、生殖毒性が強くなるので作業性の点で問題があり、炭素数が５を超えると疎水性が高くなるため、洗浄液組成物の水溶性が低下して、十分な洗浄性が得られない。また、Ｒ２は製造上の容易性の点から炭素数は２〜４のアルキレン基である。そして、ｎは１〜３の正の整数である。ｎが４を超えると洗浄液組成物の水溶性が低くなるため、十分な洗浄性が得られない。通常の洗浄工程では、洗浄液組成物による洗浄後にプレリンス処理・仕上げリンス処理の水すすぎ処理を行い、洗浄剤組成物を完全に除去してマスキング冶具の清浄度を高める。この洗浄工程を繰り返すことにより、プレリンス槽の水に含まれる洗浄液組成物濃度が高くなる。そのため、洗浄剤組成物の水溶性が低いと、プレリンス槽に溶解した樹脂（洗浄対象）が析出し、マスキング冶具に再付着する。 The component (B) is not particularly limited as long as it is an alkylene oxide compound represented by the general formula (1). In the general formula (1), R 1 is an alkylene group of 3 to 5. If the carbon number of R 1 is less than 3, reproductive toxicity becomes strong and there is a problem in terms of workability. If the carbon number exceeds 5, the hydrophobicity increases, so the water solubility of the cleaning liquid composition decreases. As a result, sufficient detergency cannot be obtained. R 2 is an alkylene group having 2 to 4 carbon atoms from the viewpoint of ease of production. N is a positive integer of 1 to 3. When n exceeds 4, the water-solubility of the cleaning liquid composition becomes low, so that sufficient cleaning properties cannot be obtained. In a normal cleaning process, a pre-rinsing / finish rinsing water rinsing process is performed after cleaning with the cleaning liquid composition, and the cleaning composition is completely removed to increase the cleanliness of the masking jig. By repeating this cleaning step, the concentration of the cleaning liquid composition contained in the water in the pre-rinse tank is increased. Therefore, when the water solubility of the cleaning composition is low, the resin (cleaning target) dissolved in the pre-rinse tank is deposited and reattached to the masking jig.
上記（Ｂ）成分の具体例としては、エチレングリコールモノプロピルエーテル、ジエチレングリコールモノプロピルエーテル、トリエチレングリコールモノプロピルエーテル、エチレングリコールモノブチルエーテル、ジエチレングリコールモノブチルエーテル、トリエチレングリコールモノブチルエーテル、エチレングリコールモノペンチルエーテル、ジエチレングリコールモノペンチルエーテル、トリエチレングリコールモノペンチルエーテル、これらエチレンオキサイド化合物のエチレン鎖がプロピレン鎖、またはブチレン鎖となる化合物等が挙げられる。これら化合物は１種を単独でまたは２種以上を適宜に組合せて使用できる。これら化合物のうち、引火点が高くて安全性に優れる点と洗浄性が良好であるという点からエチレングリコールモノブチルエーテル、又は、ジエチレングリコールモノブチルエーテルが好ましい。 Specific examples of the component (B) include ethylene glycol monopropyl ether, diethylene glycol monopropyl ether, triethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, ethylene glycol monopentyl ether, Examples include diethylene glycol monopentyl ether, triethylene glycol monopentyl ether, and compounds in which the ethylene chain of these ethylene oxide compounds is a propylene chain or a butylene chain. These compounds can be used singly or in appropriate combination of two or more. Of these compounds, ethylene glycol monobutyl ether or diethylene glycol monobutyl ether is preferred because of its high flash point, excellent safety, and good detergency.
上記（Ｃ）成分の配合量は、５〜１０重量％である。５重量％未満の場合は、引火性が高くなり作業性の点から危険であり、１０重量％を超えると、洗浄性を十分発揮することができない。 The blending amount of the component (C) is 5 to 10% by weight. If the amount is less than 5% by weight, the flammability becomes high and dangerous from the viewpoint of workability.
上記（Ａ）〜（Ｃ）成分の配合方法は、特に限定されず、一般的な液体の混合方法が用いられる。具体的な配合方法として、攪拌法が挙げられる。 The blending method of the components (A) to (C) is not particularly limited, and a general liquid mixing method is used. A specific mixing method includes a stirring method.
本発明のポリアミドイミド樹脂除去用の洗浄剤組成物は、ポリアミドイミド樹脂を含む潤滑塗料除去用であることが好ましい。上記潤滑塗料は、内燃機関を構成するピストン等の摺動部位において、金属の摩耗を防ぐために形成される被膜に使用されるものである。潤滑塗料は、固体潤滑材と結合剤で構成されている。固体潤滑材は、低摩擦係数、高耐摩耗性を付与するために用いられ、具体例としては、ポリテトラフルオロエチレン、二硫化モリブデン、グラファイト等が挙げられる。結合剤は、固体潤滑剤粒子間、固体潤滑粒子と金属間を結合する事で摺動により脱落するのを抑制する役割を果たし、耐熱性、耐久性、潤滑性に優れたポリアミドイミド樹脂が用いられる。 It is preferable that the cleaning agent composition for removing polyamideimide resin of the present invention is for removing a lubricating paint containing a polyamideimide resin. The lubricating paint is used for a coating formed to prevent metal wear at a sliding portion such as a piston constituting an internal combustion engine. The lubricating paint is composed of a solid lubricant and a binder. The solid lubricant is used for imparting a low friction coefficient and high wear resistance, and specific examples include polytetrafluoroethylene, molybdenum disulfide, and graphite. The binder plays the role of suppressing the falling off by sliding by bonding between the solid lubricant particles and between the solid lubricant particles and the metal. Polyamideimide resin with excellent heat resistance, durability and lubricity is used. It is done.
本発明のポリアミドイミド樹脂除去用の洗浄剤組成物は、モリブデンペースト除去用であることが好ましい。モリブデンペーストとは、ポリアミドイミド樹脂含有潤滑塗料の一種であり、固体潤滑材に二硫化モリブデンを含有する潤滑塗料である。 The cleaning composition for removing polyamideimide resin of the present invention is preferably for removing molybdenum paste. Molybdenum paste is a kind of polyamideimide resin-containing lubricating paint, and is a lubricating paint containing molybdenum disulfide in a solid lubricant.
本発明の洗浄剤組成物を用いて、被洗浄物を洗浄するにあたっては、各種の洗浄方法を採用できる。例えば、浸漬法、浸漬揺動法、スプレー法、超音波洗浄法が挙げられる。洗浄剤組成物を適用する際の条件は、除去すべきポリアミドイミド樹脂の種類等により適宜選択すればよく、一般に除去すべきポリアミドイミド樹脂を洗浄除去するのに有効な温度と時間で洗浄剤をポリアミドイミド樹脂に接触させる。 Various cleaning methods can be employed for cleaning an object to be cleaned using the cleaning composition of the present invention. Examples of the method include an immersion method, an immersion rocking method, a spray method, and an ultrasonic cleaning method. The conditions for applying the cleaning composition may be appropriately selected depending on the type of polyamideimide resin to be removed, etc., and the cleaning agent is generally used at a temperature and time effective for cleaning and removing the polyamideimide resin to be removed. Contact with polyamideimide resin.
洗浄剤組成物の使用時の温度は２０〜８０℃程度である。これは使用温度が２０℃よりも低い場合にはポリアミドイミド樹脂の溶解性が悪くなるため、また、８０℃よりも高くなる場合には水分の蒸発が早く、洗浄剤の組成管理が煩雑になるためである。通常は５０〜７０℃程度とするのが好ましい。例えば６０℃程度の温度において超音波洗浄法により除去する場合には、一般に本発明の洗浄剤組成物にポリアミドイミド樹脂含有モリブデンペーストの付着したマスキング冶具を約１〜５分程度洗浄すれば、良好に除去することができる。 The temperature at the time of use of a cleaning composition is about 20-80 degreeC. This is because the solubility of the polyamide-imide resin is poor when the use temperature is lower than 20 ° C., and when the temperature is higher than 80 ° C., the evaporation of moisture is quick, and the composition management of the cleaning agent becomes complicated. Because. Usually, it is preferably about 50 to 70 ° C. For example, when removing by an ultrasonic cleaning method at a temperature of about 60 ° C., it is generally good if the masking jig having the polyamideimide resin-containing molybdenum paste adhered to the cleaning composition of the present invention is cleaned for about 1 to 5 minutes. Can be removed.
こうしてポリアミドイミド樹脂を除去されたマスキング冶具は仕上げ処理として、洗浄剤組成物による洗浄のあとに、プレリンス処理、仕上げリンス処理の水すすぎ処理を行い残留している可能性のある洗浄剤組成物を完全に除去する。このような水洗処理により、マスキング冶具の清浄度は、非常に高いものとなる。 In this way, the masking jig from which the polyamideimide resin has been removed is subjected to a pre-rinsing treatment and a water rinsing treatment of the final rinsing treatment after the cleaning with the cleaning composition, and a cleaning composition that may remain. Remove completely. By such a water washing process, the cleanliness of the masking jig becomes very high.
以下、実施例を挙げて本発明を更に詳しく説明するが、本発明はこれらの実施例のみに限定されるものではない。また実施例中、「％」及び「部」は特に断りのない限り「重量％」、「重量部」を意味する。 EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not limited only to these Examples. In the examples, “%” and “part” mean “% by weight” and “part by weight” unless otherwise specified.
実施例１
１，３−ジメチル−２−イミダゾリジノン６５部（Ａ成分）、ジエチレングリコールモノブチルエーテル３０部（Ｂ成分、一般式（１）において、Ｒ１の炭素数が４、Ｒ２の炭素数が２、ｎが２である）、水５部（Ｃ成分）を混合して洗浄剤組成物を調整した。
Example 1
65 parts of 1,3-dimethyl-2-imidazolidinone (component A), 30 parts of diethylene glycol monobutyl ether (component B, in general formula (1), R 1 has 4 carbon atoms, R 2 has 2 carbon atoms, n is 2) and 5 parts of water (C component) were mixed to prepare a cleaning composition.
実施例２〜５、および比較例１〜７は、実施例１において洗浄剤組成物を表１に示すように変化させた他は実施例１と同様に調整した。 Examples 2 to 5 and Comparative Examples 1 to 7 were prepared in the same manner as Example 1 except that the cleaning composition in Example 1 was changed as shown in Table 1.
表１中、（Ａ）成分は１，３−ジメチル−２−イミダゾリジノン（ＤＭＩ）を示す。（Ｂ）成分はアルキレンオキサイド化合物であり、ｂ１〜ｂ９は、表２に示すとおりである。（Ｃ）成分は水を示す。 In Table 1, the component (A) represents 1,3-dimethyl-2-imidazolidinone (DMI). The component (B) is an alkylene oxide compound, and b1 to b9 are as shown in Table 2. (C) A component shows water.
実施例１〜５および比較例１〜７で得られた各種の洗浄剤組成物を用いて、以下の試験方法で洗浄性、及び水溶性を評価した。試験結果を表３に示す。 Using various cleaning compositions obtained in Examples 1 to 5 and Comparative Examples 1 to 7, cleaning properties and water solubility were evaluated by the following test methods. The test results are shown in Table 3.
（洗浄性試験のテストピースの作製）
２５ｍｍ×３７ｍｍ×０．３ｍｍのＳＵＳ３０４基板（日本テストパネル製）にポリアミドイミド樹脂を含有するモリブデンペースト（東レ・ダウコーニング製、ＭＯＬＹＫＯＴＥ（Ｒ） Ｄ−７３５ ＡＮＴＩ−ＦＲＩＣＴＩＯＮ ＣＯＡＴＩＮＧ）を０．０３ｇ塗布し、揮発成分を除くために室温で２４時間静置した。
(Preparation of test piece for cleaning test)
Apply 0.03g of molybdenum paste (manufactured by Toray Dow Corning, MOLYKOTE (R) D-735 ANTI-FRICTION COATING) containing 25% x 37mm x 0.3mm SUS304 substrate (manufactured by Nippon Test Panel) containing polyamide-imide resin. In order to remove volatile components, the mixture was allowed to stand at room temperature for 24 hours.
（洗浄性試験）上記の方法で作製したテストピースを用いて、超音波洗浄法による洗浄性試験を行った。超音波条件：１００Ｗ、２８ｋＨｚ（本多電子、Ｗ−１１３卓上型超音波洗浄装置）
液温が５０℃の表１記載の洗浄液組成物にテストピースを接触させ、１分間超音波振動にて洗浄し、モリブデンペーストが除去されているかどうかを目視で評価した。評価基準としては、モリブデンペーストの残渣が無い場合は、完全に除去されたもの（○）とし、モリブデンペーストの残渣が存在し、残渣重量が塗布重量に対して１０％未満の場合はほぼ除去されたものとし（△）、モリブデンペーストの残渣重量が塗布重量に対して１０％以上の場合は除去できないもの（×）と判断した。試験結果を表３に示す。
(Detergency test) Using the test piece produced by the above method, a detergency test by an ultrasonic cleaning method was performed. Ultrasonic conditions: 100 W, 28 kHz (Honda Electronics, W-113 desktop ultrasonic cleaning device)
The test piece was brought into contact with the cleaning liquid composition shown in Table 1 having a liquid temperature of 50 ° C., washed with ultrasonic vibration for 1 minute, and visually evaluated whether the molybdenum paste was removed. As an evaluation standard, when there is no residue of molybdenum paste, it should be completely removed (◯). It was judged that it was not removable (x) when the residual weight of the molybdenum paste was 10% or more with respect to the coating weight. The test results are shown in Table 3.
（水溶性試験）
表１記載の洗浄剤組成物を純水で２０倍希釈し、洗浄剤組成物の５％水溶液を作製した。洗浄剤組成物の５％水溶液の２５℃における透明性を目視で確認し、透明なものは水溶性良好（○）、白濁したものは水溶性不良（×）と判断した。試験結果を表３に示す。
(Water solubility test)
The cleaning composition shown in Table 1 was diluted 20 times with pure water to prepare a 5% aqueous solution of the cleaning composition. The transparency at 25 ° C. of a 5% aqueous solution of the cleaning composition was visually confirmed, and a transparent one was judged to have good water solubility (◯) and a white turbid one was judged to be poor in water solubility (×). The test results are shown in Table 3.
Claims (3)
The cleaning composition for removing polyamideimide resin according to claim 2, wherein the polyamideimide resin-containing lubricating paint is a molybdenum paste.
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