JPH091014A - Method for coating water-based coating material and its apparatus - Google Patents
Method for coating water-based coating material and its apparatusInfo
- Publication number
- JPH091014A JPH091014A JP7177956A JP17795695A JPH091014A JP H091014 A JPH091014 A JP H091014A JP 7177956 A JP7177956 A JP 7177956A JP 17795695 A JP17795695 A JP 17795695A JP H091014 A JPH091014 A JP H091014A
- Authority
- JP
- Japan
- Prior art keywords
- water
- solid content
- content concentration
- collected
- paint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Separation Of Particles Using Liquids (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、水性塗料の塗装方法お
よびその装置に関し、詳しくは、湿式塗装ブースを用い
る水性塗料のスプレー塗装方法において未塗着塗料を工
業的に有利な方法で完全に回収・再利用することができ
る塗装方法および装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for coating a water-based paint, and more particularly to a method for spray-coating a water-based paint using a wet coating booth to completely remove an uncoated paint by an industrially advantageous method. The present invention relates to a coating method and device that can be collected and reused.
【０００２】[0002]
【従来の技術およびその解決すべき課題】従来、例え
ば、特開昭４９−５１３２４号公報には、湿式塗装ブー
スを用いる水性塗料のスプレー塗装方法において、未塗
着塗料を廃棄することは、塗料の損失となるばかりでな
く、環境汚染の問題を生ずることになることから、未塗
着塗料たるオーバースプレーを湿式塗装ブース内の循環
水に捕集して得られる捕集水を限外濾過膜、逆浸透濾過
膜などに通し、水を濾過して濃縮することにより固形分
濃度をスプレー塗装用水性塗料のそれと同程度にして使
用することにより捕集水より未塗着塗料たるオーバース
プレー塗料を回収する方法が開示されている。しかしな
がらこの方法では、濃縮手段として限外濾過装置、逆浸
透濾過装置に設備コストがかかることの他に、捕集水を
濾過・濃縮して塗料を回収する過程で捕集水中に含まれ
る低分子酸成分、アミン、溶剤などが分離液と共に流出
して塗料樹脂から引き離され、濃縮した回収塗料中の樹
脂が不安定になって増粘し、濾過効率が低下して目的と
するスプレー塗装用水性塗料としての固形分濃度まで濃
縮するのが困難であるという問題がある。2. Description of the Related Art Conventionally, for example, in Japanese Unexamined Patent Publication No. 49-51324, in a spray coating method of a water-based paint using a wet coating booth, discarding an uncoated paint is a problem. Not only the loss of water but also the problem of environmental pollution, the collected water obtained by collecting unsprayed overspray into the circulating water in the wet coating booth is used as an ultrafiltration membrane. By passing water through a reverse osmosis filtration membrane, etc. and filtering and concentrating the water to make the solid content concentration similar to that of the water-based paint for spray coating, the over-spray paint which is uncoated paint from the collected water can be used. A method of collecting is disclosed. However, in this method, in addition to the equipment cost of the ultrafiltration device and the reverse osmosis filtration device as the concentrating means, low molecular weight molecules contained in the collected water are collected in the process of filtering and concentrating the collected water to recover the paint. Acid components, amines, solvents, etc. flow out together with the separated liquid and are separated from the paint resin, and the resin in the concentrated recovered paint becomes unstable and thickens, and the filtration efficiency decreases, resulting in the desired spray coating water base. There is a problem that it is difficult to concentrate to a solid content concentration as a paint.
【０００３】特開平６−３２０１０３号公報には、捕集
水の濾過・濃縮手段として限外濾過装置などを用いる水
性塗料のスプレー塗装方法における上記した諸問題点を
解決する方法として、回収塗料の分離液の再使用方法が
提案されている。しかしながら、この方法も捕集水の濾
過・濃縮工程を必要としていること、その、濾過・濃縮
手段として設備コストのかかる限外濾過装置などが必要
であることなどの問題があり、捕集水の濾過・濃縮工程
が不要であり、したがって設備コストのかかる限外濾過
装置などの濾過・濃縮手段が不要であり、捕集水の濾過
・濃縮に伴なう諸問題を生ずることなく、また環境汚染
の問題を生ずることもなく、工業的に有利な方法で未塗
着塗料を完全に回収・再利用しうる水性塗料の塗装方法
が要望されている。Japanese Unexamined Patent Publication No. 6-320103 discloses a method of recovering a recovered paint as a method for solving the above-mentioned problems in the spray coating method of an aqueous paint using an ultrafiltration device as a means for filtering / concentrating collected water. A method of reusing the separated liquid has been proposed. However, this method also has a problem that it requires a step of filtering / concentrating the collected water, and an ultrafiltration device that requires equipment cost as a filtering / concentrating means. No filtration / concentration process is required, and therefore no filtration / concentration means such as ultrafiltration equipment, which requires equipment cost, does not cause various problems associated with filtration / concentration of collected water, and environmental pollution There is a demand for a method for coating a water-based paint which can completely recover and reuse the uncoated paint by an industrially advantageous method without causing the above problem.
【０００４】本発明は、湿式塗装ブースを用いる水性塗
料のスプレー塗装方法において、従来技術におけるよう
に設備コストのかかる限外濾過装置などを用いて捕集水
を濾過・濃縮する工程が不要であり、捕集水の濾過・濃
縮に伴なう諸問題、例えば濾過・濃縮後の回収塗料中の
樹脂が不安定になって増粘する問題などを生ずることな
く、また環境汚染の問題を生ずることもなく、工業的に
有利な方法で未塗着塗料を完全に回収・再利用しうる水
性塗料の塗装方法および装置を提供することを目的とし
ている。The present invention does not require a step of filtering / concentrating the collected water by using an ultrafiltration device which requires a facility cost as in the prior art in a spray coating method of a water-based paint using a wet coating booth. , Various problems associated with the filtration / concentration of collected water, such as the problem that the resin in the recovered paint after filtration / concentration becomes unstable and thickens, and the problem of environmental pollution In other words, it is an object of the present invention to provide a coating method and apparatus for a water-based paint that can completely recover and reuse uncoated paint by an industrially advantageous method.
【０００５】[0005]
【課題を解決するための手段】すなわち、本発明は、水
性塗料を被塗物にスプレー塗装し、一定量の水を入れた
水槽よりの循環水であって被塗物の背後に形成される水
流カーテンにより、被塗物に塗着しなかった未塗着塗料
を捕集し、捕集された未塗着塗料と共に水槽に入れて捕
集水とする水性塗料の塗装方法であって、未塗着塗料に
基づく所定の固形分濃度を有する所定量の捕集水に、所
定の固形分濃度を有する所定量の補給用高固形分水性塗
料を配合して所定の固形分濃度を有する所定量のスプレ
ー塗装用水性塗料として使用する工程を繰り返し、未塗
着塗料を完全に回収・再利用することよりなり、捕集水
の固形分濃度がスプレー塗装用水性塗料の固形分濃度よ
りも低く、補給用水性塗料の固形分濃度がスプレー塗装
用水性塗料の固形分濃度よりも高いことを特徴とする前
記水性塗料の塗装方法；および湿式塗装ブースの水槽よ
り所定の固形分濃度を有する所定量の捕集水を供給する
ライン、該ラインにより供給される捕集水と新たに補給
される所定の固形分濃度を有する所定量の高固形分水性
塗料とを配合して所定の固形分濃度を有する所定量のス
プレー塗装用水性塗料とする配合槽、および該スプレー
塗装用水性塗料を該配合槽よりスプレー手段へ供給する
ラインよりなる前記方法に用いられる装置を提供するも
のである。That is, according to the present invention, a water-based paint is spray-painted on an object to be coated, which is circulating water from a water tank containing a certain amount of water and is formed behind the object. A method of coating a water-based paint that collects uncoated paint that has not been applied to an object to be coated by a water curtain and puts it in a water tank together with the collected uncoated paint to collect water. A predetermined amount having a predetermined solid content concentration by blending a predetermined amount of replenishing high solid content water-based paint having a predetermined solid content concentration with a predetermined amount of collected water having a predetermined solid content concentration based on the coating composition By repeating the process of using as a water-based paint for spray coating, the uncoated paint is completely collected and reused, and the solid content concentration of the collected water is lower than the solid content concentration of the water-based paint for spray coating. The solid content concentration of the replenishing water-based paint is the solid of the water-based paint for spray painting. A method for coating an aqueous paint having a concentration higher than the concentration; and a line for supplying a predetermined amount of collected water having a predetermined solid content concentration from a water tank of a wet coating booth, and collected water supplied by the line And a newly-supplied replenishing tank with a predetermined amount of a high solid content water-based paint having a predetermined solid content concentration to obtain a predetermined amount of a water-based paint for spray coating having a predetermined solid content concentration, and the spray coating. It is intended to provide an apparatus used in the above method, which comprises a line for supplying a water-based paint for use from the compounding tank to a spraying means.
【０００６】本発明方法において使用されるスプレー塗
装用水性塗料は、水溶性、コロイダルディスパージョン
またはエマルションの形態を有する、アルキド樹脂、ア
クリル樹脂、ウレタン樹脂およびエポキシ樹脂よりなる
群から選ばれる少くとも１種の樹脂を樹脂成分として含
有するのが好ましい。また該水性塗料は、樹脂成分に水
酸基などの官能基を導入し、架橋剤としてメラミン樹脂
などを用いる加熱硬化型のもの、または樹脂成分に不飽
和基を導入し、ドライヤーで酸化重合させる常温架橋型
のものであってもよい。該水性塗料は、通常上記樹脂成
分および架橋剤にさらに着色顔料、体質顔料、染料、硬
化剤、流動調整剤、増粘剤、はじき防止剤、ツヤ消し
剤、消泡剤、抗菌剤などを必要に応じて配合し、分散
機、撹拌機などを用いて製造される。スプレー塗装用水
性塗料を塗装する際の粘度はフォードカップ＃４で３０
〜９０秒であり、その固形分濃度は塗料の種類によって
も異なるが通常３５〜５０重量％である。The water-based coating composition for spray coating used in the method of the present invention is at least 1 selected from the group consisting of alkyd resins, acrylic resins, urethane resins and epoxy resins, which are in the form of water-soluble, colloidal dispersion or emulsion. It is preferable to contain a seed resin as a resin component. Further, the water-based coating is a heat-curable type in which a functional group such as a hydroxyl group is introduced into a resin component and a melamine resin or the like is used as a cross-linking agent, or an unsaturated group is introduced into a resin component and oxidative polymerization is performed by a dryer to be cross-linked at room temperature. It may be of a mold. The water-based paint usually requires a coloring pigment, an extender pigment, a dye, a curing agent, a flow control agent, a thickener, an anti-repellent agent, a matting agent, a defoaming agent, an antibacterial agent and the like in addition to the above resin component and crosslinking agent. It is blended according to the above and is produced using a disperser, a stirrer, or the like. Viscosity when applying water-based paint for spray painting is 30 with Ford Cup # 4
The solid content concentration is usually from 35 to 50% by weight, though it varies depending on the kind of coating material.
【０００７】本発明方法において、スプレー塗装が開始
され、水流カーテンにより未塗着塗料を捕集するにあた
り、水流カーテンを形成する循環水が水そのものであっ
ても、また予じめ本発明で用いられる水性塗料を含有し
たものであってもよいが、特に循環水が水そのものであ
る場合、スプレー塗装用水性塗料としては安定であって
も、水に無限希釈状態で捕集される際、荷電状態がくず
れ、樹脂の析出、顔料の凝集などの問題が生ずるため、
特に水そのものの水流カーテンによって未塗着塗料を捕
集する際には、循環水に予じめアミン化合物を添加して
そのｐＨ値を７〜１２、好ましくは８〜１０の範囲に調
整しておくことが好ましい。添加されるアミン化合物
は、６０〜３００℃の沸点を有し、塗料分野で一般に使
用されるものが適切である。該沸点が３００℃より高い
と、塗膜乾燥後も塗膜中にアミン化合物が残存し、耐水
性低下の原因となる。一方、沸点が６０℃より低いと、
アミン化合物が空気中に揮散し、ｐＨ値の維持が困難に
なる。該アミン化合物の具体例としては、例えば、トリ
メチルアミン、トリエチルアミン、ジイソプロピルアミ
ン、トリイソプロピルアミン、モノブチルアミン、ジブ
チルアミン、トリブチルアミン等のアルキルアミン；モ
ノエタノールアミン、ジエタノールアミン、トリエタノ
ールアミン、モノ（２−ヒドロキシプロピル）アミン、
ジ（２−ヒドロキシプロピル）アミン、トリ（２−ヒド
ロキシプロピル）アミン、ジメチルアミノエタノール、
ジエチルアミノエタノール等のアルカノールアミン；エ
チレンジアミン、プロピレンジアミン、ジエチレントリ
アミン、トリエチレンテトラミン等のアルキレンポリア
ミン；プロピレンイミン等のアルキレンイミン；ピペラ
ジン、モルホリン、ピラジン、ピリジン等が挙げられ
る。In the method of the present invention, when spray coating is started and the uncoated paint is collected by the water flow curtain, even if the circulating water forming the water flow curtain is water itself, it is used in the present invention. Although it may contain a water-based paint that can be used, especially when the circulating water is water itself, it is stable as a water-based paint for spray coating, but when it is collected in infinite dilution in water, it is charged. Since problems such as deterioration of the state, precipitation of resin, aggregation of pigment, etc. occur,
In particular, when collecting the uncoated paint by a water flow curtain of water itself, the amine compound is added in advance to the circulating water to adjust the pH value to 7 to 12, preferably 8 to 10. It is preferable to set. The amine compound added has a boiling point of 60 to 300 ° C., and those generally used in the paint field are suitable. When the boiling point is higher than 300 ° C., the amine compound remains in the coating film even after drying the coating film, which causes a decrease in water resistance. On the other hand, if the boiling point is lower than 60 ° C,
The amine compound volatilizes in the air, making it difficult to maintain the pH value. Specific examples of the amine compound include, for example, alkylamines such as trimethylamine, triethylamine, diisopropylamine, triisopropylamine, monobutylamine, dibutylamine, tributylamine; monoethanolamine, diethanolamine, triethanolamine, mono (2-hydroxy). Propyl) amine,
Di (2-hydroxypropyl) amine, tri (2-hydroxypropyl) amine, dimethylaminoethanol,
Alkanolamines such as diethylaminoethanol; alkylenepolyamines such as ethylenediamine, propylenediamine, diethylenetriamine and triethylenetetramine; alkyleneimines such as propyleneimine; piperazine, morpholine, pyrazine and pyridine.
【０００８】本発明方法において、未塗着塗料に基づく
所定の固形分濃度を有する所定量の捕集水に、所定の固
形分濃度を有する所定量の補給用高固形分水性塗料を配
合して所定の固形分濃度を有する所定量のスプレー塗装
用水性塗料として使用する工程を繰り返すことにより未
塗着水性塗料が完全に回収・再利用される。In the method of the present invention, a predetermined amount of collected high-concentration water-based paint having a predetermined solid content is blended with a predetermined amount of collected water having a predetermined solid content based on an uncoated paint. By repeating the process of using a predetermined amount of the water-based paint for spray coating having a predetermined solid content concentration, the uncoated water-based paint is completely recovered and reused.
【０００９】本発明方法で使用される捕集水の固形分濃
度は、スプレー塗装用水性塗料のそれよりも低く、スプ
レー塗装用水性塗料の固形分濃度が通常３５〜５０重量
％であることから、通常５０重量％未満であればよい
が、循環水用のポンプにかかる負荷を考慮して、３５重
量％未満が好ましく、０．１〜３０重量％の範囲が特に
好ましい。The solid content concentration of the collected water used in the method of the present invention is lower than that of the water-based paint for spray coating, and the solid content concentration of the water-based paint for spray coating is usually 35 to 50% by weight. Usually, it may be less than 50% by weight, but considering the load applied to the pump for circulating water, it is preferably less than 35% by weight, particularly preferably in the range of 0.1 to 30% by weight.
【００１０】本発明方法で使用される補給用高固形分水
性塗料の固形分濃度は、スプレー塗装用水性塗料のそれ
よりも高く、スプレー塗装用水性塗料の固形分濃度が通
常３５〜５０重量％であることから、３５重量％を超え
るが、塗料の製造のしやすさの点より、好ましくは６０
〜９０重量％、さらに好ましくは６５〜８０重量％の範
囲にある。The solid content concentration of the replenishing high solid content aqueous coating material used in the method of the present invention is higher than that of the spray coating aqueous coating material, and the solid content concentration of the spray coating aqueous coating material is usually 35 to 50% by weight. Therefore, it is more than 35% by weight, but is preferably 60 from the viewpoint of ease of production of the coating.
To 90% by weight, more preferably 65 to 80% by weight.
【００１１】本発明方法において、スプレー塗装される
スプレー塗装用水性塗料のうち通常約５０％程度が被塗
物に塗着されないで背後の水流カーテンにより捕集され
るが、この捕集工程を繰返していくと捕集水の固形分濃
度はスプレー塗装用水性塗料の固形分濃度に限りなく近
づくことになる。一方この捕集工程を繰り返すとき、場
合によっては水槽の液量が変動する場合があり、その場
合には必要に応じて水流カーテンおよび水槽の水面のう
ち水流カーテンより湿式塗装ブース内側の水面の面積を
調整してそれらより通常の塗装条件下、例えば温度３０
℃、湿度７０％の条件下に蒸発する水分などの揮発分の
量を調節して水槽内の液量を適宜調節してもよく、場合
によっては水槽に新たに水を添加して調節してもよく、
場合によっては補給用水性塗料に配合する捕集水の水分
の一部を蒸発させる蒸発手段を設けて調節してもよい。In the method of the present invention, usually about 50% of the water-based paint for spray coating which is spray-coated is collected by the water curtain behind it without being applied to the object to be coated, but this collecting step is repeated. The solid content concentration of the collected water approaches the solid content concentration of the water-based paint for spray coating as much as possible. On the other hand, when this collection process is repeated, the amount of liquid in the water tank may fluctuate in some cases.In that case, if necessary, the area of the water surface inside the wet coating booth from the water curtain of the water curtain and the water surface of the water tank. By adjusting them under normal coating conditions, for example, a temperature of 30
The liquid volume in the water tank may be adjusted as appropriate by adjusting the amount of volatile components such as moisture that evaporates under conditions of ℃ and 70% humidity. In some cases, water may be newly added to the water tank for adjustment. Well,
Depending on the case, it may be adjusted by providing an evaporation means for evaporating a part of the water content of the collected water to be mixed with the replenishing water-based paint.
【００１２】添付図面の図１により、本発明の方法およ
びその装置について以下説明する。図１において、スプ
レーガン１よりスプレー塗装用水性塗料が被塗物２に塗
着されるが、塗着されなかった未塗着塗料は水槽３に入
れられた一定量の水をポンプ４により循環させて形成さ
れる水流カーテン５により捕集されて循環水と共に水槽
に入って捕集水６となり、この捕集水の固形分濃度が所
定濃度に達した時点で捕集水の所定量を捕集水供給ライ
ン７を通って配合槽８に送り、配合槽８内で所定の固形
分濃度を有する所定量の補給用高固形分水性塗料と配合
して所定の固形分濃度を有する所定量のスプレー塗装用
水性塗料を調製し、スプレーガン１への供給ライン９を
通り、必要に応じて設けられる濾過器１０および塗装用
塗料タンク１１より調整されたスプレー塗装用水性塗料
がスプレーガン１に供給されてスプレー塗装に使用され
る工程が繰り返されることにより未塗着塗料が完全に回
収・再利用される。場合によっては、必要に応じて供給
ライン７に蒸発装置（図示せず）を設けて水槽中の捕集
水の量を調節してもよい。The method and apparatus of the present invention will be described below with reference to FIG. 1 of the accompanying drawings. In FIG. 1, a water-based paint for spray painting is applied from a spray gun 1 to an article 2 to be coated, but uncoated paint which has not been applied is circulated by a pump 4 in a fixed amount of water contained in a water tank 3. It is collected by the water flow curtain 5 that is formed by this and enters the water tank together with the circulating water to become the collected water 6. When a solid concentration of this collected water reaches a predetermined concentration, a predetermined amount of the collected water is collected. It is sent to the blending tank 8 through the water collection supply line 7 and is blended with a predetermined amount of high-concentration replenishing water-based paint having a predetermined solid content concentration in the blending tank 8 to obtain a predetermined amount of the solid content concentration. A water-based paint for spray coating is prepared, and the water-based paint for spray coating adjusted is supplied to the spray gun 1 through a supply line 9 to the spray gun 1 and a filter 10 and a paint tank 11 for coating provided as necessary. Being used for spray painting Non-application paint is fully recovered and recycled by that step are repeated. In some cases, an evaporator (not shown) may be provided in the supply line 7 to adjust the amount of collected water in the water tank, if necessary.
【００１３】[0013]
【発明の効果】本発明によれば、湿式塗装ブースを用い
る水性塗料のスプレー塗装方法において、従来技術にお
けるように設備コストのかかる限外濾過装置などを用い
て捕集水を濾過・濃縮する工程が不要であり、捕集水の
濾過・濃縮に伴なう諸問題、例えば濾過・濃縮後の回収
塗料中の樹脂が不安定になって増粘する問題などを生ず
ることなく、また環境汚染の問題を生ずることもなく、
工業的に有利な方法で未塗着塗料を完全に回収・再利用
しうる水性塗料の塗装方法および装置が提供される。According to the present invention, in a spray coating method for a water-based paint using a wet coating booth, a step of filtering and concentrating the collected water by using an ultrafiltration device or the like which requires equipment cost as in the prior art. Is unnecessary, does not cause various problems associated with filtration / concentration of collected water, such as the problem that the resin in the recovered paint after filtration / concentration becomes unstable and thickens, and does not cause environmental pollution. Without causing any problems,
Provided is a method and apparatus for coating a water-based paint that can completely recover and reuse uncoated paint by an industrially advantageous method.
【００１４】[0014]
【実施例】本発明を実施例によりさらに具体的に説明す
る。実施例において、特に断らない限り「部」および
「％」は何れも重量基準による。EXAMPLES The present invention will be described more specifically with reference to examples. In the examples, "parts" and "%" are based on weight unless otherwise specified.
【００１５】実施例１ 酸価４５、水酸基価４０および数平均分子量５０００の
アルキド樹脂をジエタノールアミンで中和し、固形分濃
度６０％の水溶性アルキド樹脂を得た。この水溶性アル
キド樹脂１２５部に、硬化剤としての水溶性メラミン樹
脂（三井サイアナミド社製、商品名・サイメル３５０、
固形分濃度１００％）３０部、カーボンブラック１０部
およびマイカ１００部を配合し、サンドミルで分散後、
水を加えて固形分濃度７０％の高固形分水性塗料を得
た。この高固形分水性塗料を水で稀釈して固形分濃度４
０％のスプレー塗装用水性塗料とした。容量４００リッ
トルの水槽に２００リットルの水を入れ、トリエチルア
ミンを加えてｐＨを９に調整し、水流カーテンおよび水
槽の水面のうち水流カーテンより湿式塗装ブース内側の
水面の合計が６ｍ2 となる湿式塗装ブースを用いて、上
記した固形分濃度４０％のスプレー塗装用水性塗料を、
１日当り２０ｋｇの割合でスプレー塗装を行なったとこ
ろ、そのうち１０ｋｇが被塗物に塗着し、残りの１０ｋ
ｇが未塗着塗料として水流カーテンにより捕集されて水
槽にはいり捕集水となった。この捕集水の所定量を配合
槽に供給し、上記した固形分濃度７０％の補給用高固形
分水性塗料の所定量と配合して１日当り固形分濃度４０
％のスプレー塗装用水性塗料２０ｋｇを調製し、翌日、
調製された固形分濃度４０％のスプレー塗装用水性塗料
を前日と同様にスプレー塗装し、以下１日ごとに同様の
工程を繰り返し３０日間継続した。捕集水の固形分濃度
は徐々に上昇してくるが、２０日以降は固形分濃度約３
０％の捕集水１３．３部に対し、上記固形分濃度７０％
の補給用水性塗料６．７部の割合で配合することで定常
状態になり、未塗着塗料の変質もなく、未塗着塗料を完
全に回収・再利用することができた。Example 1 An alkyd resin having an acid value of 45, a hydroxyl value of 40 and a number average molecular weight of 5000 was neutralized with diethanolamine to obtain a water-soluble alkyd resin having a solid content concentration of 60%. To 125 parts of this water-soluble alkyd resin, a water-soluble melamine resin as a curing agent (manufactured by Mitsui Cyanamide Co., Ltd., trade name: Cymel 350,
30 parts of solid content concentration (100%), 10 parts of carbon black and 100 parts of mica are blended and dispersed in a sand mill.
Water was added to obtain a high solid content water-based paint having a solid content concentration of 70%. This high solid content water-based paint is diluted with water to obtain a solid content of 4
It was a 0% aqueous paint for spray painting. Wet 200 liters of water in a water tank of 400 liters, adjust the pH to 9 by adding triethylamine, and wet coating where the total of the water surface inside the wet coating booth from the water curtain of the water curtain and the water curtain of the water tank is 6 m 2. Using a booth, the above-mentioned water-based paint for spray coating with a solid concentration of 40%,
When spray painting was performed at a rate of 20 kg per day, 10 kg of which was applied to the object to be coated and the remaining 10 k
g was collected as uncoated paint by a water curtain and was collected in a water tank to be collected water. A predetermined amount of this collected water is supplied to a mixing tank and mixed with a predetermined amount of the above-mentioned replenishing high solid content aqueous paint having a solid content concentration of 70% to obtain a solid content concentration of 40% per day.
% Water-based paint for spray painting was prepared, and the next day,
The prepared water-based coating composition for spray coating having a solid content concentration of 40% was spray-coated in the same manner as the previous day, and the same process was repeated every day thereafter for 30 days. The solid content concentration of the collected water gradually increases, but after 20 days, the solid content concentration will be about 3
The solid content concentration is 70% with respect to 13.3 parts of 0% collected water.
By adding 6.7 parts of the replenishing water-based paint, a steady state was achieved, and there was no deterioration of the uncoated paint, and the uncoated paint could be completely recovered and reused.
【００１６】実施例２ 酸価４０および数平均分子量８０００のエポキシエステ
ルディスパージョン樹脂をトリエタノールアミンで中和
し、固形分濃度５０％のコロイダルディスパージョン水
性樹脂を得た。この水性樹脂２００部、ドライヤー（大
日本インキ（株）製、商品名・ディックネート３１１
１、Ｃｏ系）５部、カーボンブラック１０部およびバリ
タ１００部を配合し、サンドミルで分散後、水を加えて
固形分６５％の補給用高固形分水性塗料を得た。これに
水を加えて固形分濃度４０％のスプレー塗装用水性塗料
とした。容量４００リットルの水槽に２００リットルの
水を入れ、トリエタノールアミンを加えてｐＨを９に調
整し、水流カーテンおよび水槽の水面のうち水流カーテ
ンより湿式塗装ブース内側の水面の合計が４０ｍ2 とな
る湿式塗装ブースを用いて、上記した固形分濃度４０％
のスプレー塗装用水性塗料を、１日当り４０ｋｇの割合
でスプレー塗装を行なったところ、そのうち２０ｋｇが
被塗物に塗着し、残りの２０ｋｇが未塗着塗料として水
流カーテンにより捕集されて水槽にはいり捕集水となっ
た。この捕集水の所定量を配合槽に供給し、上記した固
形分濃度６５％の補給用高固形分水性塗料の所定量と配
合して１日当り固形分濃度４０％のスプレー塗装用水性
塗料４０ｋｇを調製し、翌日、調製された固形分濃度４
０％のスプレー塗装用水性塗料を前日と同様にスプレー
塗装し、以下１日ごとに同様の工程を繰り返し、６０日
間継続した。捕集水の固形分濃度は徐々に上昇するが、
２０日以降は、固形分濃度約３０％の捕集水２６．７
部、固形分濃度６５％の補給用水性塗料１２．３部およ
び水１部の割合で配合してスプレー塗装用水性塗料とす
ることで定常状態に達し、未塗着塗料の変質もなく、未
塗着塗料を完全に回収・再利用することができた。Example 2 An epoxy ester dispersion resin having an acid value of 40 and a number average molecular weight of 8000 was neutralized with triethanolamine to obtain a colloidal dispersion aqueous resin having a solid content concentration of 50%. 200 parts of this water-based resin, dryer (manufactured by Dainippon Ink and Chemicals, Inc., trade name Dicknate 311)
1, Co-based), 10 parts of carbon black, and 100 parts of barita were mixed and dispersed in a sand mill, and then water was added to obtain a replenishment high solid content aqueous paint having a solid content of 65%. Water was added to this to obtain a water-based paint for spray coating having a solid content of 40%. Put 200 liters of water in a water tank of 400 liters, adjust the pH to 9 by adding triethanolamine, and the total water surface inside the wet coating booth from the water flow curtain and the water flow curtain will be 40 m 2. Using a wet coating booth, the above solid content concentration is 40%
When the water-based paint for spray painting of 40 kg was spray-painted at a rate of 40 kg per day, 20 kg of it was applied to the object to be coated and the remaining 20 kg was collected as uncoated paint by the water curtain and was collected in the water tank. Water was collected by squirrels. A predetermined amount of this collected water is supplied to a mixing tank and mixed with a predetermined amount of the above-mentioned replenishing high solid content water-based paint having a solid content of 65%, and 40 kg of a water-based paint for spray coating having a solid content of 40% per day. The next day, the solid content concentration was adjusted to 4
A 0% water-based paint for spray coating was spray-coated in the same manner as the previous day, and the same process was repeated every day thereafter and continued for 60 days. The solid content concentration of the collected water gradually rises,
After 20 days, 26.7 of collected water with a solid content of about 30%
Parts, 12.3 parts of a replenishing water-based paint having a solid content of 65% and 1 part of water to prepare a water-based paint for spray coating, and a steady state was reached. We were able to completely collect and reuse the applied paint.
【図１】本発明の方法および装置を説明するための概略
図である。FIG. 1 is a schematic diagram for explaining the method and apparatus of the present invention.
【符号の説明】 １ スプレーガン ２ 被塗物 ３ 水槽 ４ ポンプ ５ 水流カーテン ６ 捕集水 ７ 捕集水供給ライン ８ 配合槽 ９ 供給ライン １０ 濾過器 １１ 塗装用塗料タンク[Explanation of symbols] 1 spray gun 2 coated object 3 water tank 4 pump 5 water curtain 6 collected water 7 collected water supply line 8 compounding tank 9 supply line 10 filter 11 paint tank for coating
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０５Ｄ 3/00 Ｂ０５Ｄ 3/00 Ａ Ｂ 7/24 ３０１ 7/24 ３０１Ｆ ３０２ ３０２Ｗ ３０２Ｐ ３０２Ｔ ３０２Ｕ (72)発明者 早瀬 徹 神奈川県平塚市東八幡４丁目17番１号 関 西ペイント株式会社内 (72)発明者 片山 禎二 神奈川県平塚市東八幡４丁目17番１号 関 西ペイント株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location B05D 3/00 B05D 3/00 A B 7/24 301 7/24 301F 302 302W 302P 302T 302U (72 ) Inventor Toru Hayase 4-17-1, Higashi-Hachiman, Hiratsuka-shi, Kanagawa Kansai Paint Co., Ltd. (72) Sadaji Katayama 4-1-1, Higashi-Hachiman, Hiratsuka, Kanagawa Pref.
Claims (14)
定量の水を入れた水槽よりの循環水であって被塗物の背
後に形成される水流カーテンにより、被塗物に塗着しな
かった未塗着塗料を捕集し、捕集された未塗着塗料と共
に水槽に入れて捕集水とする水性塗料の塗装方法であっ
て、未塗着塗料に基づく所定の固形分濃度を有する所定
量の捕集水に、所定の固形分濃度を有する所定量の補給
用高固形分水性塗料を配合して所定の固形分濃度を有す
る所定量のスプレー塗装用水性塗料として使用する工程
を繰り返し、未塗着塗料を完全に回収・再利用すること
よりなり、捕集水の固形分濃度がスプレー塗装用水性塗
料の固形分濃度よりも低く、補給用水性塗料の固形分濃
度がスプレー塗装用水性塗料の固形分濃度よりも高いこ
とを特徴とする前記水性塗料の塗装方法。1. A water-based paint is spray-painted on an object to be coated, and the water is circulated from a water tank containing a certain amount of water and is applied to the object to be coated by a water curtain formed behind the object. It is a method of coating an aqueous paint that collects uncoated paint that was not applied and puts it in a water tank together with the collected uncoated paint to obtain a predetermined solid content concentration based on the uncoated paint. A step of blending a predetermined amount of collected water having a predetermined solid content concentration with a predetermined amount of a replenishing high solid content aqueous coating material having a predetermined solid content concentration to use as a predetermined amount of a spray coating aqueous coating material having a predetermined solid content concentration By repeating this process, the uncoated paint is completely collected and reused.The solid content concentration of the collected water is lower than that of the water-based paint for spray coating, and the solid content of the replenishing water-based paint is sprayed. The above characterized in that it is higher than the solid content concentration of the water-based paint for painting How to apply water-based paint.
るにあたり、アミン化合物を添加することにより循環水
のｐＨ値が７〜１２の範囲に調整される請求項１記載の
方法。2. The method according to claim 1, wherein the pH value of the circulating water is adjusted to be in the range of 7 to 12 by adding an amine compound in collecting the uncoated paint by the water curtain.
ある請求項２記載の方法。3. The method according to claim 2, wherein the boiling point of the amine compound is 60 to 300 ° C.
スパージョンまたはエマルションの形態を有する、アル
キド樹脂、アクリル樹脂、ウレタン樹脂およびエポキシ
樹脂よりなる群から選ばれる少くとも１種の樹脂を樹脂
成分として含有する請求項１記載の方法。4. The resin composition comprises at least one resin selected from the group consisting of alkyd resin, acrylic resin, urethane resin and epoxy resin, which has a water-soluble, colloidal dispersion or emulsion form as a resin component. The method according to claim 1, wherein the method comprises.
３５〜５０重量％の範囲にある請求項１記載の方法。5. The method according to claim 1, wherein the aqueous coating composition for spray coating has a solid content concentration in the range of 35 to 50% by weight.
ある請求項１記載の方法。6. The method according to claim 1, wherein the solid content concentration of the collected water is less than 50% by weight.
％の範囲にある請求項１記載の方法。7. The method according to claim 1, wherein the solid content concentration of the collected water is in the range of 0.1 to 35% by weight.
％を超える請求項１記載の方法。8. The method according to claim 1, wherein the replenishing aqueous coating composition has a solid content concentration of more than 35% by weight.
％を超える請求項１記載の方法。9. The method according to claim 1, wherein the replenishing aqueous coating composition has a solid content concentration of more than 50% by weight.
９０重量％である請求項１記載の方法。10. The solid content concentration of the replenishing water-based paint is 60 to
The method according to claim 1, which is 90% by weight.
水流カーテンより湿式塗装ブース内側の水面の面積を調
整してそれより蒸発する揮発分の量を調節する請求項１
記載の方法。11. The water curtain and the water surface of the water tank, the area of the water surface inside the wet coating booth from the water curtain is adjusted to adjust the amount of volatile components evaporated therefrom.
The described method.
を調節する請求項１記載の方法。12. The method according to claim 1, wherein water is newly added to the water tank to adjust the liquid amount in the water tank.
部を蒸発させて水槽の液量を調節する請求項１記載の方
法。13. A collection water for mixing with a replenishing water-based paint
The method according to claim 1, wherein the amount of liquid in the aquarium is adjusted by evaporating the part.
分濃度を有する所定量の捕集水を供給するライン、該ラ
インにより供給される捕集水と新たに補給される所定の
固形分濃度を有する所定量の高固形分水性塗料とを配合
して所定の固形分濃度を有する所定量のスプレー塗装用
水性塗料とする配合槽、および該スプレー塗装用水性塗
料を該配合槽よりスプレー手段に供給するラインよりな
る請求項１記載の方法に用いられる装置。14. A line for supplying a predetermined amount of collected water having a predetermined solid content concentration from a water tank of a wet coating booth, the collected water supplied by the line and a predetermined solid content concentration to be newly replenished. A blending tank for blending a predetermined amount of a high-solid content water-based paint to obtain a predetermined amount of a water-based paint for spray coating having a predetermined solid content concentration, and supplying the water-based paint for spray coating to the spray means from the blending tank An apparatus for use in the method of claim 1 comprising a line for
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17795695A JP3570783B2 (en) | 1995-06-22 | 1995-06-22 | Method and apparatus for coating water-based paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17795695A JP3570783B2 (en) | 1995-06-22 | 1995-06-22 | Method and apparatus for coating water-based paint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH091014A true JPH091014A (en) | 1997-01-07 |
| JP3570783B2 JP3570783B2 (en) | 2004-09-29 |
Family
ID=16040027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17795695A Expired - Fee Related JP3570783B2 (en) | 1995-06-22 | 1995-06-22 | Method and apparatus for coating water-based paint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3570783B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002332456A (en) * | 2001-05-10 | 2002-11-22 | Dainippon Toryo Co Ltd | Water-dispersed powder coating, method for producing the same and method for producing coated inorganic building material |
| JP2003047895A (en) * | 2001-08-08 | 2003-02-18 | Nippon Paint Co Ltd | Recycle method of water based intermediate coating material |
| JP2005013914A (en) * | 2003-06-27 | 2005-01-20 | Kansai Paint Co Ltd | Method for forming coating film of water-based coating |
| KR102205082B1 (en) * | 2020-04-21 | 2021-01-19 | 김대중 | Coating method using coating composition for robot spray |
-
1995
- 1995-06-22 JP JP17795695A patent/JP3570783B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002332456A (en) * | 2001-05-10 | 2002-11-22 | Dainippon Toryo Co Ltd | Water-dispersed powder coating, method for producing the same and method for producing coated inorganic building material |
| JP2003047895A (en) * | 2001-08-08 | 2003-02-18 | Nippon Paint Co Ltd | Recycle method of water based intermediate coating material |
| JP2005013914A (en) * | 2003-06-27 | 2005-01-20 | Kansai Paint Co Ltd | Method for forming coating film of water-based coating |
| KR102205082B1 (en) * | 2020-04-21 | 2021-01-19 | 김대중 | Coating method using coating composition for robot spray |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3570783B2 (en) | 2004-09-29 |
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