JP4618429B2 - Wet paint booth circulating water defoamer - Google Patents
Wet paint booth circulating water defoamer Download PDFInfo
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- JP4618429B2 JP4618429B2 JP2005194293A JP2005194293A JP4618429B2 JP 4618429 B2 JP4618429 B2 JP 4618429B2 JP 2005194293 A JP2005194293 A JP 2005194293A JP 2005194293 A JP2005194293 A JP 2005194293A JP 4618429 B2 JP4618429 B2 JP 4618429B2
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本発明は泡立ち抑制方法に関する。詳しくは、泡立ちが問題となる湿式塗装ブースに適
用される泡立ち抑制に関する。
The present invention relates to a method for suppressing foaming. Specifically, it relates to foam suppression applied to wet painting booths where foaming is a problem.
従来から自動車、建築材、あるいは家庭用電化製品等の各種の塗装において、一般に塗装効率が２０〜８０％であるために余剰ミストを循環水で捕集する湿式塗装ブースが常用されている。循環水に捕集された塗料ミストは凝集して浮上または沈降するが、粘着性が高いため、塗装ブースの循環系(例えば水膜板、シャワー、ノズル、配管、ストレーナー、ポンプ等)に塗料滓となり固着し、これらの系を閉塞させてしまう。このため塗装ブースの処理効率や塗装作業効率に大きな影響を与え、塗料滓の除去には多大な労力や経費を必要としている。このような問題に対処するために従来から塗料ミストを不粘着化させたり分散させたりする目的で種々の処理剤が使用されてきた。これまで知られている処理剤の例としては、ベントナイト等の粘度鉱物、セピオライト(特殊な繊維状鉱物)、アルカリ剤、両性金属化合物、カチオン性ポリマー、コロイダルシリカ等があり、これら２種以上を組み合わせる提案もされている（特許文献１参照）。
このような湿式塗装ブース循環水において余剰塗料は薬剤の添加によって不粘着化処理することにより微細な塗料スラッジとなるため循環水中に均一に分散されやすくなるものの、この微細な塗料スラッジのために循環水が発泡しやすいという問題があった。この発泡は循環水の汚れ具合によっても進行し、異常発泡となる場合もあった。さらに近年環境影響を配慮して使用量が増えている水溶性塗料は、顔料の親水性を向上させるために親水性の界面活性剤や樹脂が添加されていることから、循環水の発泡が著しくなっている。著しい発泡によってブースピットから循環水が溢れたり、塗料滓の回収が困難となることが問題視されている。
従来、このような湿式塗装ブース循環水系における発泡抑制対策としてシリコン系消泡剤、脂肪酸多価金属塩、疎水性有機溶剤、消泡性非イオン性界面活性剤等が候補に挙げられるが、シリコン系消泡剤はシリコン系消泡剤を含む泡が被塗装物に付着した場合、塗装不良を起こすことから湿式塗装ブース循環水系への適用が嫌われている。残るシリコン系以外の消泡剤についても1)効果の持続性がなく多量の消泡剤を必要とする。2)多量の消泡剤を使用することは、循環水系の汚れを増大させ、むしろ発泡を促進させる結果となる。3)塗料ミスト不粘着,分散処理剤薬効に悪影響を及ぼす。といった欠点があった。
Conventionally, in various coatings such as automobiles, building materials, and household appliances, a wet coating booth that collects surplus mist with circulating water is generally used because the coating efficiency is generally 20 to 80%. The paint mist collected in the circulating water aggregates and floats or sinks, but because of its high tackiness, the paint mist collects in the circulation system of the paint booth (for example, water film plate, shower, nozzle, piping, strainer, pump, etc.). Will stick and block these systems. For this reason, it greatly affects the processing efficiency of the painting booth and the painting work efficiency, and the removal of the paint soot requires a great deal of labor and cost. In order to cope with such a problem, various treatment agents have been conventionally used for the purpose of detackifying or dispersing the paint mist. Examples of treatment agents known so far include viscous minerals such as bentonite, sepiolite (special fibrous minerals), alkali agents, amphoteric metal compounds, cationic polymers, colloidal silica, and the like. Combination proposals have also been made (see Patent Document 1).
In such wet paint booth circulating water, excess paint becomes a fine paint sludge by detackifying treatment by adding chemicals, so it becomes easy to be uniformly dispersed in the circulating water, but it circulates for this fine paint sludge. There was a problem that water easily foamed. This foaming also progressed depending on the degree of contamination of the circulating water and sometimes resulted in abnormal foaming. Furthermore, water-soluble paints, which have been used in recent years in consideration of environmental impacts, have a significant amount of foaming of circulating water because hydrophilic surfactants and resins are added to improve the hydrophilicity of pigments. It has become. It is regarded as a problem that circulating foam overflows from the booth pit due to significant foaming and that it becomes difficult to collect paint scum.
Conventionally, silicon-based antifoaming agents, fatty acid polyvalent metal salts, hydrophobic organic solvents, antifoaming nonionic surfactants and the like can be cited as candidates for foaming suppression measures in such wet paint booth circulating water systems. When a foam containing a silicon-based antifoaming agent adheres to an object to be coated, the system-based defoaming agent causes poor coating, and is therefore not suitable for application to a wet paint booth circulating water system. The remaining antifoaming agents other than silicon-based ones also have a long-lasting effect and require a large amount of antifoaming agent. 2) The use of a large amount of antifoaming agent results in increased dirt in the circulating water system, but rather promotes foaming. 3) Paint mist is non-adhesive and has an adverse effect on the efficacy of the dispersion treatment. There was a drawback.
本発明の目的は従来技術における上記したような課題を解決し、安定した効果を発揮し得る消泡剤を提供することにある。 An object of the present invention is to provide an antifoaming agent capable of solving the above-described problems in the prior art and exhibiting a stable effect.
本発明者らは脂肪族エーテル化合物について鋭意検討した結果、一般式(1)で示されるポリキシアルキレンラウリルエーテルが湿式塗装ブース循環水系において安定な消泡効果を発揮し且つ塗料ミスト不粘着,分散処理剤薬効を阻害しないことが判明し本発明に到達した。すなわち本発明は一般式(1)で表される脂肪族エーテル化合物からなる湿式塗装ブース循環水の消泡剤に関するものである。
Ｒ1Ｏ(ＣＨ２ＣＲＨＯ)nＨ (1)
(Ｒ１はアルキル基、Ｒは水素又はメチル基を示す)
As a result of intensive studies on the aliphatic ether compound, the present inventors have shown that the polyoxyalkylene lauryl ether represented by the general formula (1) exhibits a stable defoaming effect in a wet coating booth circulating water system, and is free of paint mist adhesion and dispersion. It has been found that it does not inhibit the efficacy of the treatment agent, and has reached the present invention. That is, the present invention relates to an antifoaming agent for wet paint booth circulating water composed of an aliphatic ether compound represented by the general formula (1).
R 1 O (CH 2 CRHO) n H (1)
(R1 represents an alkyl group, R represents hydrogen or a methyl group)
泡立ちが問題となる湿式塗装ブースにおいてポリオキシアルキレンラウリルエーテルを添加することにより持続性のある消泡効果を発揮し且つ塗料ミスト不粘着,分散処理剤の薬効を阻害せず産業上有用である。 Addition of polyoxyalkylene lauryl ether in a wet paint booth where foaming is a problem provides a durable defoaming effect, and is industrially useful without coating mist non-sticking and without inhibiting the efficacy of the dispersion treatment agent.
本発明の一般式(1)で示される脂肪族エーテル化合物としてはポリオキシエチレンラウリルエーテル、ポリオキシエチレンノニルエーテル、ポリオキシプロピレンラウリルエーテル、ポリオキシエチレンオクチルエーテル、ポリオキシエチレンプロピレンラウリルエーテル、ポリオキシエチレンプロピレンノニルエーテル、ポリオキシエチレンオレイルエーテル等が挙げられるが、市販品として入手しやすい点及び消泡効果の点からポリオキシエチレンプロピレンラウリルエーテルを用いるのが好ましい。例えば、第一工業製薬株式会社製商品名DKS NL Dash400やＢＡＳＦ社製Plurafac LF1300が挙げられる。
これら脂肪族エーテル化合物はＨＬＢ値が１〜３のものが消泡剤として適している。ＨＬＢ値とは親水性と疎水性の強さを示す指標であり、(2)式によって求めることができる。
ＨＬＢ＝〔(親水性部分の分子量／全体の分子量)×１００〕÷５ (2)
本発明におけるポリオキシエチレンプロピレンラウリルエーテルの代表的な使用方法は次の通りである。すなわち、ポリオキシエチレンプロピレンラウリルエーテルの添加形態については特に制限はないが、濃度としてブース循環水全量に対して0.002〜0.5重量%が好ましい。0.002重量%未満であると消泡の効果が弱く、0.5重量%を超えると経済的に不利である。より好ましくは、0.002〜0.2重量%である。
本発明はポリオキシエチレンプロピレンラウリルエーテル単独で充分な性能を得ることができるが、脂肪酸多価金属塩系、ポリグリコール系等他の消泡剤と併用しても何ら差し支えない。
以下に本発明を実施例により更に具体的に説明するが、本発明は要旨を超えない限り以下の実施例に限定されるものではない。
Examples of the aliphatic ether compound represented by the general formula (1) of the present invention include polyoxyethylene lauryl ether, polyoxyethylene nonyl ether, polyoxypropylene lauryl ether, polyoxyethylene octyl ether, polyoxyethylene propylene lauryl ether, polyoxyethylene Ethylene propylene nonyl ether, polyoxyethylene oleyl ether and the like can be mentioned, but polyoxyethylene propylene lauryl ether is preferably used from the viewpoint of easy availability as a commercial product and the defoaming effect. For example, trade names DKS NL Dash400 manufactured by Daiichi Kogyo Seiyaku Co., Ltd. and Plurafac LF1300 manufactured by BASF are listed.
These aliphatic ether compounds having an HLB value of 1 to 3 are suitable as an antifoaming agent. The HLB value is an index indicating the strength of hydrophilicity and hydrophobicity, and can be obtained by equation (2).
HLB = [(molecular weight of hydrophilic portion / total molecular weight) × 100] ÷ 5 (2)
A typical method of using polyoxyethylene propylene lauryl ether in the present invention is as follows. That is, the addition form of polyoxyethylene propylene lauryl ether is not particularly limited, but the concentration is preferably 0.002 to 0.5% by weight with respect to the total amount of booth circulating water. If it is less than 0.002% by weight, the defoaming effect is weak, and if it exceeds 0.5% by weight, it is economically disadvantageous. More preferably, it is 0.002 to 0.2% by weight.
In the present invention, sufficient performance can be obtained with polyoxyethylene propylene lauryl ether alone, but it may be used in combination with other antifoaming agents such as fatty acid polyvalent metal salts and polyglycols.
Examples The present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples unless it exceeds the gist.
実施例１
発泡が著しい自動車工場湿式塗装ブース循環水50mlを200mlメスシリンダーに採取し、ポリオキシエチレンプロピレンラウリルエーテル、ＨＬＢ３、第一工業製薬株式会社製商品名DKS NL Dash400を50mg/l添加後、焼結ボールフィルターを通じてエアを通気量１Ｌ/分で通気した際の泡立ち状態を観測した。結果を表１に示した。
Example 1
Wet paint booth with remarkable foaming 50 ml of circulating water collected in a 200 ml graduated cylinder, polyoxyethylene propylene lauryl ether, HLB3, Daiichi Kogyo Seiyaku Co., Ltd. product name DKS NL Dash400 50 mg / l added, sintered ball The bubbling state was observed when air was passed through the filter at an air flow rate of 1 L / min. The results are shown in Table 1.
実施例２
消泡剤ポリオキシエチレンプロピレンラウリルエーテルをＢＡＳＦ社製商品名Plurafac LF1300にしたこと以外は実施例１と同様に評価した。結果を表１に示した。
Example 2
Evaluation was conducted in the same manner as in Example 1 except that the defoaming agent polyoxyethylene propylene lauryl ether was changed to the product name Plurafac LF1300 manufactured by BASF. The results are shown in Table 1.
比較例１
消泡剤を添加しなかったこと以外は実施例１と同様に評価した。結果を表１に示した。
Comparative Example 1
Evaluation was performed in the same manner as in Example 1 except that no antifoaming agent was added. The results are shown in Table 1.
比較例２
消泡剤をポリオキシエチレンポリオキシプロピレンブロックポリマー、分子量２６００、ＨＬＢ２：ＢＡＳＦ社製商品名Pluronic PE8100としたこと以外は実施例１と同様に評価した。結果を表１に示した。
Comparative Example 2
Evaluation was conducted in the same manner as in Example 1 except that the defoaming agent was polyoxyethylene polyoxypropylene block polymer, molecular weight 2600, HLB2: trade name Pluronic PE8100 manufactured by BASF. The results are shown in Table 1.
比較例３
消泡剤をポリオキシエチレンポリオキシプロピレンブロックポリマー、分子量２２００、ＨＬＢ２：第一工業製薬株式会社製商品名エパン７１０としたこと以外は実施例１と同様に評価した。結果を表１に示した。
Comparative Example 3
Evaluation was conducted in the same manner as in Example 1 except that the defoaming agent was polyoxyethylene polyoxypropylene block polymer, molecular weight 2200, HLB2: trade name Epan 710 manufactured by Daiichi Kogyo Seiyaku Co., Ltd. The results are shown in Table 1.
比較例４
消泡剤をポリオキシエチレンポリオキシプロピレンブロックポリマー、分子量１３００、ＨＬＢ２：第一工業製薬株式会社製商品名エパン４１０としたこと以外は実施例１と同様に評価した。結果を表１に示した。
Comparative Example 4
Evaluation was conducted in the same manner as in Example 1 except that the defoaming agent was polyoxyethylene polyoxypropylene block polymer, molecular weight 1300, HLB2: trade name Epan 410 manufactured by Daiichi Kogyo Seiyaku Co., Ltd. The results are shown in Table 1.
比較例５
消泡剤をポリアルキレングリコール系：第一工業製薬株式会社製商品名アンチフロスＦ１０２としたこと以外は実施例１と同様に評価した。結果を表１に示す。
Comparative Example 5
Evaluation was conducted in the same manner as in Example 1 except that the antifoaming agent was polyalkylene glycol-based: trade name Antifloss F102 manufactured by Daiichi Kogyo Seiyaku Co., Ltd. The results are shown in Table 1.
実施例３、４および比較例６、７、８
消泡剤各々について簡易吹きつけ試験装置を用い、塗料ミスト不粘着,分散処理剤との相性を試験した。本例で使用した簡易吹きつけ試験装置図を図１に示す。
簡易吹きつけ試験装置は保有水量1L、循環水量5L/minであり、系内には受水槽、水膜形成板を設け、水膜部分に模型用スプレーガンで塗料ミストを噴霧した水をマグネットポンプで循環することにより湿式塗装ブースを再現している。吹きつけ前後の受水槽重量を測定することにより受水槽固着量を求め、これを全吹きつけ塗料量で除することにより塗料固着率として算出している。試験水としては塗料ミスト不粘着,分散処理剤としてベントナイトを1000mg/l溶解した後、消泡剤を各々150mg/l添加した液を用いた。実施例１、２、比較例１、２、３、４、５より消泡効果がほとんど認められなかった消泡剤については本試験を省略し、比較としてブランク(薬剤無添加系)及びベントナイトのみを1000mg/l添加した系、ベントナイト1000mg/lにポリオキシエチレンポリオキシプロピレンブロックポリマー系消泡剤Pluronic PE8100を150mg/l添加した系の試験をそれぞれ実施した。塗料の吹きつけにはクリア塗料シンナー１.２倍希釈品を使用し、吹きつけ量は１２ｇである。塗料不粘着効果の判定に際しては、○：受水槽への塗料固着率が３％を下回り、細かく分散している。×：受水槽への塗料固着率が１０％を上回り、細かく分散していない、と表記した。
試験結果を表２に示す。
Examples 3 and 4 and Comparative Examples 6, 7, and 8
Each antifoaming agent was tested for compatibility with paint mist non-adhesive and dispersion treatment agents using a simple spray test device. A simple spray test apparatus used in this example is shown in FIG.
The simple spray test device has a water volume of 1L and a circulating water volume of 5L / min. A water receiving tank and a water film forming plate are installed in the system, and water that has been sprayed with paint mist with a model spray gun on the water film part is a magnet pump. The wet painting booth is reproduced by circulating in The amount of water receiving tank fixed is obtained by measuring the weight of the water receiving tank before and after spraying, and this is divided by the total amount of paint sprayed to calculate the paint fixing rate. As the test water, a paint mist non-adhesive, bentonite 1000 mg / l as a dispersion treatment agent was dissolved, and then an antifoaming agent 150 mg / l was added. This example was omitted for the antifoaming agents in which the antifoaming effect was hardly recognized from Examples 1, 2, and Comparative Examples 1, 2, 3, 4, 5, and only blank (no drug added system) and bentonite were compared. Was added to the system in which 1000 mg / l of bentonite was added, and 150 mg / l of the polyoxyethylene polyoxypropylene block polymer antifoaming agent Pluronic PE8100 was added to 1000 mg / l of bentonite. A clear paint thinner 1.2-fold diluted product is used for spraying the paint, and the spray amount is 12 g. When judging the paint non-adhesive effect, ○: The paint adherence rate to the water receiving tank is less than 3% and finely dispersed. X: The paint adhesion rate to the water receiving tank exceeded 10%, and it was described as not being finely dispersed.
The test results are shown in Table 2.
Claims (3)
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| JP2005194293A JP4618429B2 (en) | 2005-07-01 | 2005-07-01 | Wet paint booth circulating water defoamer |
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| JP2005194293A JP4618429B2 (en) | 2005-07-01 | 2005-07-01 | Wet paint booth circulating water defoamer |
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| JP2007007614A (en) * | 2005-07-01 | 2007-01-18 | Mitsubishi Gas Chem Co Inc | Treating method of wet coating booth circulation water |
| JP2007014845A (en) * | 2005-07-05 | 2007-01-25 | Mitsubishi Gas Chem Co Inc | Method of treating circulating water of wet type coating booth |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04345694A (en) * | 1991-05-22 | 1992-12-01 | Lion Corp | Antifoam and alkali cleaning agent composition |
| JPH06508548A (en) * | 1991-06-26 | 1994-09-29 | ヘンケル・コマンディットゲゼルシャフト・アウフ・アクチェン | Antifoaming agent |
| JPH07506763A (en) * | 1992-05-18 | 1995-07-27 | ヘンケル・コマンディットゲゼルシャフト・アウフ・アクチェン | Paint modification and solidification methods |
| JP2001225068A (en) * | 2000-02-18 | 2001-08-21 | Kurita Water Ind Ltd | Method for treating circulating water of wet coating booth |
| JP2004351362A (en) * | 2003-05-30 | 2004-12-16 | Neos Co Ltd | Treating agent and treating method for coating mist |
-
2005
- 2005-07-01 JP JP2005194293A patent/JP4618429B2/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04345694A (en) * | 1991-05-22 | 1992-12-01 | Lion Corp | Antifoam and alkali cleaning agent composition |
| JPH06508548A (en) * | 1991-06-26 | 1994-09-29 | ヘンケル・コマンディットゲゼルシャフト・アウフ・アクチェン | Antifoaming agent |
| JPH07506763A (en) * | 1992-05-18 | 1995-07-27 | ヘンケル・コマンディットゲゼルシャフト・アウフ・アクチェン | Paint modification and solidification methods |
| JP2001225068A (en) * | 2000-02-18 | 2001-08-21 | Kurita Water Ind Ltd | Method for treating circulating water of wet coating booth |
| JP2004351362A (en) * | 2003-05-30 | 2004-12-16 | Neos Co Ltd | Treating agent and treating method for coating mist |
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| JP2007007613A (en) | 2007-01-18 |
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