JPH05214267A - Process of concentrating water-based coating material - Google Patents
Process of concentrating water-based coating materialInfo
- Publication number
- JPH05214267A JPH05214267A JP4021522A JP2152292A JPH05214267A JP H05214267 A JPH05214267 A JP H05214267A JP 4021522 A JP4021522 A JP 4021522A JP 2152292 A JP2152292 A JP 2152292A JP H05214267 A JPH05214267 A JP H05214267A
- Authority
- JP
- Japan
- Prior art keywords
- water
- paint
- weight
- concentration
- based 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、塗装ブース内の洗浄水
中から水性塗料を回収して再使用する際におこなわれる
水性塗料の濃縮方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for concentrating a water-based paint, which is performed when the water-based paint is recovered from the wash water in a paint booth and reused.
【０００２】[0002]
【従来の技術】塗装ブース内において水性塗料をスプレ
ー塗装するにあたって、被塗装物に塗着しない塗料のダ
ストが多く発生するが、この塗料ダストは塗装ブース内
の洗浄水に溶解乃至分散させて捕集される。このように
洗浄水に捕集される塗料ダストは多量であるために、こ
れをそのまま廃棄すると塗料の損失になると共に、また
環境汚染の問題にもつながる。2. Description of the Related Art When spraying a water-based paint in a paint booth, a large amount of paint dust that does not adhere to the object to be painted is generated, but this paint dust is dissolved or dispersed in the wash water in the paint booth and collected. Gathered. Since a large amount of paint dust is collected in the wash water as described above, discarding the paint dust as it is leads to a loss of paint and also leads to a problem of environmental pollution.
【０００３】そこで、従来から洗浄水に捕集された塗料
を回収して再使用することが検討されており、例えば特
開昭４９−５１３２４号公報に開示されるような回収方
法が提案されている。すなわちこのものは、水性塗料の
噴霧ダストを塗装ブース内の水に捕集することによって
得られる塗料希釈水を逆浸透濾過膜や限外濾過膜などに
通し、水を濾過して濃縮することによって水性塗料の不
揮発分濃度を元の水性塗料と同程度に戻すようにしたも
のであり、このように塗料希釈水を濃縮することによっ
て水性塗料を再生使用できるようにしたものである。Therefore, it has been conventionally considered to recover and reuse the coating material collected in the cleaning water, and for example, a recovery method disclosed in Japanese Patent Laid-Open No. 49-51324 has been proposed. There is. In other words, this product is prepared by collecting the spray dust of the water-based paint in the water in the paint booth and passing the paint dilution water through a reverse osmosis filtration membrane or an ultrafiltration membrane, and filtering and concentrating the water. The non-volatile concentration of the water-based paint is returned to the same level as that of the original water-based paint, and the water-based paint can be reused by concentrating the paint-diluting water in this way.
【０００４】[0004]
【発明が解決しようとする課題】しかし、水性塗料に
は、塗膜形成用の水溶性樹脂を水に分散させるための水
溶性の有機溶剤が配合されており、塗料希釈水を濃縮す
るために水を濾過するとこの有機溶剤も水と共に濾過さ
れ、回収された水性塗料では水溶性樹脂に対する有機溶
剤の配合比が小さくなっている。However, the water-based paint contains a water-soluble organic solvent for dispersing a water-soluble resin for forming a coating film in water. When water is filtered, this organic solvent is also filtered together with water, and in the recovered water-based paint, the compounding ratio of the organic solvent to the water-soluble resin is small.
【０００５】例えば、次の（組成１）の配合で調製され
る水性塗料にあって、顔料と樹脂分からなる不揮発分
（ＮＶ）濃度は５５重量％に調製されており、有機溶剤
として配合されているブチルセロソルブの配合量は５．
０重量％に設定されている。 （組成１） ・顔料 ３５．８重量％ ・アルキド樹脂 １５．４重量％ ・ベンゾグアナミン樹脂 ３．８重量％ 小計５５重量％ ・ブチルセロソルブ ５．０重量％ ・水 ３９．０重量％ ・ジメチルエタノールアミン １．０重量％ 計１００重量％ この水性塗料のダストが水中に捕集されて水で希釈され
ると、水分の増加によって塗料希釈水の組成は次の（組
成２）のようになり、顔料と樹脂分からなる不揮発分濃
度は１５重量％になる。 （組成２） ・顔料 ９．８重量％ ・アルキド樹脂 ４．２重量％ ・ベンゾグアナミン樹脂 １．０重量％ 小計１５重量％ ・ブチルセロソルブ ２．８重量％ ・水 ８１．９重量％ ・ジメチルエタノールアミン ０．３重量％ 計１００重量％ そしてこの塗料希釈水を限外濾過等して水を濾過するこ
とによって、顔料と樹脂分からなる不揮発分濃度を元の
水性塗料にほぼ等しくなるように濃縮すると、水と共に
ブチルセロソルブも濾過されてしまうために再生した水
性塗料の組成は次の（組成３）のようになる。 （組成３） ・顔料 ３５．８重量％ ・アルキド樹脂 １４．６重量％ ・ベンゾグアナミン樹脂 ３．７重量％ 小計５４．１重量％ ・ブチルセロソルブ １．４重量％ ・水 ４３．６重量％ ・ジメチルエタノールアミン ０．９重量％ 計１００重量％ このように、元の水性塗料には５．０重量％含有されて
いたブチルセロソルブは回収した水性塗料では１．４重
量％に減少することになる。For example, in a water-based paint prepared by the following composition (composition 1), the non-volatile component (NV) concentration consisting of pigment and resin is adjusted to 55% by weight, and it is compounded as an organic solvent. The content of butyl cellosolve is 5.
It is set to 0% by weight. (Composition 1) -Pigment 35.8 wt% -Alkyd resin 15.4 wt% -Benzoguanamine resin 3.8 wt% Subtotal 55 wt% -Butyl cellosolve 5.0 wt% -Water 39.0 wt% -Dimethylethanolamine 1 0.0 wt% Total 100 wt% When the dust of this water-based paint is collected in water and diluted with water, the composition of the paint-diluting water becomes as shown in the following (composition 2) due to an increase in water content. The non-volatile content of the resin content is 15% by weight. (Composition 2) -Pigment 9.8 wt% -Alkyd resin 4.2 wt% -Benzoguanamine resin 1.0 wt% Subtotal 15 wt% -Butylcellosolve 2.8 wt% -Water 81.9 wt% -Dimethylethanolamine 0 .3% by weight Total 100% by weight And, by concentrating so that the non-volatile concentration of the pigment and the resin content is almost equal to the original water-based paint by filtering this paint dilution water by ultrafiltration etc. At the same time, butyl cellosolve is also filtered, so that the composition of the regenerated water-based paint is as follows (composition 3). (Composition 3) -Pigment 35.8% by weight-Alkyd resin 14.6% by weight-Benzoguanamine resin 3.7% by weight Subtotal 54.1% by weight-Butylcellosolve 1.4% by weight-Water 43.6% by weight-Dimethylethanol Amine 0.9% by weight Total 100% by weight Thus, butyl cellosolve, which was contained in the original water-based paint at 5.0% by weight, is reduced to 1.4% by weight in the recovered water-based paint.
【０００６】このように濃縮して回収した水性塗料中の
有機溶剤の含有量が少なくなる結果、水性塗料中での水
溶性樹脂の形態が溶解状態から分散状態に変化するなど
して顔料が凝集を起こし、塗料分離が発生すると共に、
塗装塗膜にはツヤヒケなどが発生するおそれがあるとい
う問題があった。本発明は上記の点に鑑みてなされたも
のであり、塗料分離が発生することなく塗料希釈水を濃
縮して水性塗料を回収することができる水性塗料の濃縮
方法を提供することを目的とするものである。As a result of the reduced content of the organic solvent in the water-based paint thus concentrated and recovered, the morphology of the water-soluble resin in the water-based paint changes from the dissolved state to the dispersed state, and the pigment aggregates. Causing paint separation and
There is a problem that the paint film may have a gloss mark. The present invention has been made in view of the above points, and an object of the present invention is to provide a method for concentrating an aqueous coating composition capable of concentrating the coating dilution water without recovering the coating composition to recover the aqueous coating composition. It is a thing.
【０００７】[0007]
【課題を解決するための手段】本発明に係る水性塗料の
濃縮方法は、水性塗料を水中に捕集させて得られる塗料
希釈水を濾過し、水を除去することによって濃縮するに
あたって、水性塗料に配合されており水と共に濾過され
る成分、例えば有機溶剤を塗料希釈水に添加して補充し
つつ濾過をおこなうことを特徴とするものである。A method for concentrating a water-based paint according to the present invention is a method for concentrating a water-based paint by condensing the water by diluting the paint dilution water obtained by collecting the water-based paint in water and removing the water. The composition is characterized in that a component which is mixed with water and is filtered together with water, for example, an organic solvent is added to the paint diluting water to replenish it for filtration.
【０００８】また本発明にあっては、水性塗料として、
酸価が２５〜１００、水酸基価が３５〜２００、ＳＰ値
が１０．０〜１１．０の水溶性アルキド樹脂あるいは水
溶性アクリル樹脂を主成分とし、水溶性アルキド樹脂あ
るいは水溶性アクリル樹脂のＳＰ値より０．５〜３．０
高いＳＰ値を有する硬化剤を配合して調製されるものを
用いることが特に好ましい。Further, in the present invention, as a water-based paint,
SP of water-soluble alkyd resin or water-soluble acrylic resin, which is mainly composed of water-soluble alkyd resin or water-soluble acrylic resin having an acid value of 25 to 100, a hydroxyl value of 35 to 200, and an SP value of 10.0 to 11.0 0.5 to 3.0 from the value
It is particularly preferable to use one prepared by blending a curing agent having a high SP value.
【０００９】以下、本発明を詳細に説明する。図１は水
性塗料の塗装−濃縮回収システムの一例を示すものであ
り、水性塗料としてはスプレー塗装用に従来から使用さ
れているものなど、特に制限されることなく使用するこ
とができる。そしてこの水性塗料を図１のような塗装ブ
ース１においてスプレー機２でスプレー塗装する際に、
被塗装物に塗着しない塗料ダストは塗装ブース１内の洗
浄用の水６に溶解乃至分散させて捕集される。このよう
に水６に塗料ダストが捕集されると塗装作業の進行に従
って水６中の塗料の濃度が高まり、水６中の不揮発分濃
度が高くなる。水６中の不揮発分濃度が所定値にまで高
くなると、この水性塗料が溶解乃至分散する水６を塗料
希釈水７として塗料濃縮タンク３に移し、この塗料希釈
水７を濾過装置４で濾過する。The present invention will be described in detail below. FIG. 1 shows an example of a coating-concentrating and collecting system of a water-based paint, and as the water-based paint, those conventionally used for spray coating can be used without particular limitation. And when spray-painting this water-based paint with the sprayer 2 in the paint booth 1 as shown in FIG. 1,
Paint dust that does not adhere to the object to be coated is dissolved or dispersed in the cleaning water 6 in the coating booth 1 and collected. When the paint dust is collected in the water 6 as described above, the concentration of the paint in the water 6 increases as the painting work progresses, and the concentration of non-volatile components in the water 6 increases. When the nonvolatile concentration in the water 6 reaches a predetermined value, the water 6 in which this water-based paint is dissolved or dispersed is transferred to the paint concentration tank 3 as paint dilution water 7, and this paint dilution water 7 is filtered by the filtration device 4. ..
【００１０】濾過装置４としては、限外濾過膜を具備し
て形成される限外濾過装置や、逆浸透膜を具備して形成
される逆浸透濾過装置など、特開昭４９−５１３２４号
公報などで従来から提供される装置を用いておこなうこ
とができる。濃縮タンク３からこの濾過装置４に塗料希
釈水７を送って水を濾過することによって濃縮し、さら
にこの濃縮した塗料希釈水７を濃縮タンク３に返送して
再度濾過装置４に供給するというように繰り返して塗料
希釈水７を濾過することによって、塗料希釈水７を元の
水性塗料の不揮発分濃度とほぼ同じ濃度になるまで濃縮
することができる。濾過装置４で塗料希釈水７から濾過
された水６は濾液タンク５に回収し、塗装ブース１に供
給して再使用するようにしてある。As the filtration device 4, an ultrafiltration device formed by including an ultrafiltration membrane, a reverse osmosis filtration device formed by including a reverse osmosis membrane, and the like are disclosed in JP-A-49-51324. It can be performed using a device provided conventionally. The paint diluting water 7 is sent from the concentrating tank 3 to the filtering device 4 to concentrate the water by filtering the water, and the concentrated paint diluting water 7 is returned to the concentrating tank 3 and supplied again to the filtering device 4. By repeatedly filtering the paint diluting water 7, the paint diluting water 7 can be concentrated to a concentration almost equal to the non-volatile content concentration of the original water-based paint. The water 6 filtered from the paint diluting water 7 by the filtering device 4 is collected in the filtrate tank 5 and supplied to the coating booth 1 for reuse.
【００１１】このように濾過装置４に通して水を濾過す
ることによって濃縮タンク３内の塗料希釈水７を濃縮す
るにあたって、水性塗料に配合されているブチルセロソ
ルブのような水溶性の有機溶剤も水と共に濾過され、塗
料希釈水から除去されてしまうことになるが、本発明で
は水性塗料に配合されている有機溶剤８を溶剤タンク９
から濃縮タンク３内の塗料希釈水７に添加して補充しつ
つ、塗料希釈水７を濾過して濃縮する作業をおこなうよ
うにするものである。塗料希釈水７へのこの有機溶剤８
の添加の操作は、少量づつの有機溶剤８を連続して濃縮
タンク３に供給するようにしておこなったり、あるいは
濃縮の進行に伴って不揮発分濃度が所定値になった時点
で所定量の有機溶剤８を濃縮タンク３に供給すると共に
さらに濃縮の進行に伴って不揮発分濃度が所定値になっ
た時点で所定量の有機溶剤８を濃縮タンク３に供給する
という操作を繰り返して供給を不連続的におこなうよう
にしたりすることができるものであり、塗膜形成用の水
溶性樹脂に対する有機溶剤８の配合比が元の水性塗料の
場合より大きく低下しないように補充することができれ
ば良い。有機溶剤８の添加量は水性塗料の種類毎に異な
るるものであって、各水性塗料について実験的に決定す
ることができるものである。そしてこのように有機溶剤
８を塗料希釈水７に添加して補充しつつ塗料希釈水７を
濾過して濃縮することによって、不揮発分濃度を元の水
性塗料の濃度と同程度にまで濃縮すると共に有機溶剤８
の含有量も元の水性塗料と同程度に保って有機溶剤と水
との比率を元の水性塗料と同程度に保つようにすること
ができるものであり、このようにして再生された水性塗
料をスプレー機２に供給して再使用することができるも
のである。When the paint diluting water 7 in the concentrating tank 3 is concentrated by filtering the water through the filtering device 4 as described above, a water-soluble organic solvent such as butyl cellosolve mixed in the water-based paint is also water. Although it will be filtered out together with it and removed from the paint diluting water, in the present invention, the organic solvent 8 mixed in the water-based paint is replaced with the solvent tank 9
From the above, the paint diluting water 7 in the concentrating tank 3 is added and replenished while the paint diluting water 7 is filtered and concentrated. This organic solvent 8 to paint dilution water 7
The organic solvent 8 is continuously added to the concentration tank 3 in small amounts, or a predetermined amount of the organic solvent 8 is added when the concentration of nonvolatile components reaches a predetermined value with the progress of concentration. The solvent 8 is supplied to the concentration tank 3 and the operation of supplying a predetermined amount of the organic solvent 8 to the concentration tank 3 is repeated when the concentration of the nonvolatile components reaches a predetermined value as the concentration further progresses, and the supply is discontinuous. The organic solvent 8 may be replenished so that the compounding ratio of the organic solvent 8 to the water-soluble resin for forming the coating film does not decrease much more than in the case of the original water-based paint. The amount of the organic solvent 8 added varies depending on the type of water-based paint, and can be experimentally determined for each water-based paint. Then, by adding the organic solvent 8 to the paint diluting water 7 to replenish it and filtering and concentrating the paint diluting water 7, the non-volatile component concentration is concentrated to the same level as the original aqueous paint concentration. Organic solvent 8
It is also possible to keep the content of the same as that of the original water-based paint so as to keep the ratio of the organic solvent and water at the same level as the original water-based paint. Can be supplied to the sprayer 2 and reused.
【００１２】例えば既述の（組成１）の組成の水性塗料
をスプレー機２でスプレー塗装して、塗料ダストを水６
で捕集するにあたって、水６中の不揮発分濃度が（組成
２）のように１５重量％にまでなると、この水６を塗料
希釈水７として濃縮タンク３に移し、濃縮タンク３に有
機溶剤８を供給して塗料希釈水７に有機溶剤８を補充し
つつ、濃縮タンク３から塗料希釈水７を濾過装置４に通
して濾過して濃縮をおこなうことによって、次の（組成
４）の組成のように、顔料と樹脂分からなる不揮発分濃
度を元の水性塗料の５５重量％にほぼ等しくなるように
濃縮すると共に、有機溶剤（ブチルセルロース）８も元
の不揮発分濃度と等しい５重量％に維持して、水性塗料
を再生することができる。 （組成４） ・顔料 ３５．８重量％ ・アルキド樹脂 １４．８重量％ ・ベンゾグアナミン樹脂 ３．８重量％ 小計５４．４重量％ ・ブチルセロソルブ ５．０重量％ ・水 ３９．７重量％ ・ジメチルエタノールアミン ０．９重量％ 計１００重量％ このように、有機溶剤の含有量を元の水性塗料とほぼ等
しい量で保持して濃縮をおこなうことができるために、
濃縮して回収した水性塗料中の有機溶剤の含有量が少な
くなるようなことがなく、有機溶剤の含有量が少なくな
る場合のように水性塗料中での水溶性樹脂の形態が溶解
状態から分散状態に変化するなどして顔料が凝集を起こ
すことを防ぐことができ、塗料分離の発生を防いで塗装
塗膜にツヤヒケなどが発生することを防止することがで
きるものである。尚、有機溶剤を補充しないで濃縮する
と、既述のように（組成３）の組成になって有機溶剤の
含有量が少なくなり、塗料の分離が発生するが、このよ
うに有機溶剤の含有量が少なくなって一旦塗料分離が発
生すると、この後に有機溶剤を追加して有機溶剤の含有
量を増量しても塗料を再び均一な状態に戻すことはでき
ない。For example, a water-based paint having the above-mentioned composition (composition 1) is spray-coated with a sprayer 2 to remove paint dust with water 6.
When the concentration of non-volatile components in the water 6 reaches 15% by weight as shown in (composition 2), the water 6 is transferred to the concentration tank 3 as the paint dilution water 7, and the organic solvent 8 is added to the concentration tank 3. Is supplied to replenish the paint dilution water 7 with the organic solvent 8, and the paint dilution water 7 is filtered from the concentrating tank 3 through the filter device 4 to be concentrated, whereby the following composition (composition 4) is obtained. As described above, the non-volatile content of the pigment and the resin content is concentrated to approximately equal to 55% by weight of the original water-based paint, and the organic solvent (butyl cellulose) 8 is also maintained at 5% by weight, which is the same as the original non-volatile content. Then, the water-based paint can be regenerated. (Composition 4) -Pigment 35.8% by weight-Alkyd resin 14.8% by weight-Benzoguanamine resin 3.8% by weight Subtotal 54.4% -Butyl cellosolve 5.0% by weight-Water 39.7% by weight-Dimethylethanol Amine 0.9% by weight Total 100% by weight In this way, since the content of the organic solvent can be maintained at an amount almost equal to that of the original water-based paint, the concentration can be performed,
The content of the organic solvent in the water-based paint recovered after concentration does not decrease, and the form of the water-soluble resin in the water-based paint disperses from the dissolved state as in the case where the content of the organic solvent decreases. It is possible to prevent the pigment from aggregating due to a change in the state, to prevent the occurrence of paint separation, and to prevent the occurrence of glossy marks on the coating film. In addition, when concentrated without supplementing the organic solvent, as described above, the composition becomes (composition 3), the content of the organic solvent is reduced, and the paint is separated. Once the amount of paint is reduced and paint separation occurs, the paint cannot be returned to a uniform state again by adding an organic solvent to increase the content of the organic solvent.
【００１３】以上のように、本発明にあって使用する水
性塗料は特に限定されるものではないが、水溶性樹脂と
して水溶化度を高めたものを配合した水性塗料を用いる
ことが、上記のように塗料希釈水を濾過・濃縮して再生
する際に塗料分離を確実に防止するうえで好ましい。し
かしこのように水溶化度を高めた水溶性樹脂を配合して
調製される水性塗料は、耐湿性や耐沸水性などの塗膜性
能が悪くなるという問題がある。このために本発明にあ
っては、塗料希釈水を濾過・濃縮して再生するのに特に
適した水性塗料として次のものを用いるのが好ましい。
すなわち、酸価が２５〜１００、水酸基価が３５〜２０
０、ＳＰ値が１０．０〜１１．０の水溶性アルキド樹脂
あるいは水溶性アクリル樹脂を主成分とし、水溶性アル
キド樹脂あるいは水溶性アクリル樹脂のＳＰ値より０．
５〜３．０高いＳＰ値を有する硬化剤を配合して調製さ
れる水性塗料を用いるのが好ましい。As described above, the water-based paint used in the present invention is not particularly limited, but it is preferable to use a water-based paint containing a water-soluble resin having an increased water solubility. As described above, it is preferable for surely preventing the separation of the paint when the paint dilution water is filtered and concentrated to be regenerated. However, such a water-based paint prepared by blending a water-soluble resin having an increased water-solubility has a problem that the coating film performance such as moisture resistance and boiling water resistance is deteriorated. For this reason, in the present invention, it is preferable to use the following water-based paint which is particularly suitable for regenerating by filtering and concentrating the paint dilution water.
That is, the acid value is 25 to 100 and the hydroxyl value is 35 to 20.
0, a SP value of 10.0 to 11.0 is a water-soluble alkyd resin or water-soluble acrylic resin as a main component, and the SP value of the water-soluble alkyd resin or water-soluble acrylic resin is 0.
It is preferable to use an aqueous paint prepared by blending a curing agent having a high SP value of 5 to 3.0.
【００１４】以下、この塗料について詳しく説明する。
水溶性アルキド樹脂と水溶性アクリル樹脂はいずれか一
方を使用する他、両者を併用することもできるが、上記
のように水溶性アルキド樹脂や水溶性アクリル樹脂とし
ては、酸価（ＡＶ）が２５〜１００、水酸基価（ＯＨ
Ｖ）が３５〜２００、さらにＳＰ値が１０．０〜１１．
０のものを用いる。酸価が２５未満、水酸基価が３５未
満、ＳＰ価が１０．０未満であると、水溶性アルキド樹
脂や水溶性アクリル樹脂の水溶化度（親水化度）が低
く、濃縮過程で分離等が発生するおそれがある。逆に酸
価が１００を超え、水酸基価が２００を超え、ＳＰ価が
１１．０を超えると、水溶性アルキド樹脂や水溶性アク
リル樹脂の水溶化度（親水化度）が高くなり過ぎて、塗
膜の耐水性等に問題が生じることになる。The paint will be described in detail below.
Either one of the water-soluble alkyd resin and the water-soluble acrylic resin may be used, or both may be used together. However, as described above, the water-soluble alkyd resin or water-soluble acrylic resin has an acid value (AV) of 25. ~ 100, hydroxyl value (OH
V) is 35 to 200, and the SP value is 10.0 to 11.
0 is used. When the acid value is less than 25, the hydroxyl value is less than 35, and the SP value is less than 10.0, the water-solubility (hydrophilicity) of the water-soluble alkyd resin or water-soluble acrylic resin is low, and separation or the like occurs during the concentration process. It may occur. On the contrary, when the acid value exceeds 100, the hydroxyl value exceeds 200, and the SP value exceeds 11.0, the water-solubility (hydrophilicity) of the water-soluble alkyd resin or water-soluble acrylic resin becomes too high, Problems will occur in the water resistance of the coating film.
【００１５】ここで、ＳＰ値（溶解度パラメーター）は
溶解性の尺度となるものであり、次のようにして測定さ
れる。参考文献ＳＵＨ，ＣＬＡＲＫＥ〔Ｊ．Ｐ．Ｓ．Ａ
−１，５，１６７１−１６８１（１９６７）〕 ・測定温度 ２０℃ ・サンプル 樹脂０．５ｇを１００ｍｌビーカーに秤量
し、良溶媒１０ｍｌをホールピペットを用いて加え、マ
グネティックスターラーにより溶解する。 ・溶媒 良溶媒：ジオキサン、アセトン 貧溶媒：ｎ−ヘキサン、イオン交換水 ・濁点測定 ５０ｍｌビュレットを用いて貧溶媒を滴下
し、濁りが生じた点を滴下量とする。 ・計算 樹脂のＳＰ値δは次式によって与えられ
る。Here, the SP value (solubility parameter) is a measure of solubility and is measured as follows. References SUH, CLARKE [J. P. S. A
-1,5,1671-1681 (1967)]-Measurement temperature 20 ° C-Sample 0.5 g of resin is weighed in a 100 ml beaker, 10 ml of a good solvent is added using a whole pipette, and dissolved by a magnetic stirrer. -Solvent Good solvent: dioxane, acetone Poor solvent: n-hexane, ion-exchanged water-Mudging point measurement Poor solvent is dropped using a 50 ml buret, and the point at which turbidity occurs is the dropping amount. -Calculation The SP value δ of the resin is given by the following equation.
【００１６】δ＝（Ｖml 1/2 δml＋Ｖmh 1/2 δmh）／
（Ｖml 1/2 ＋Ｖmh 1/2 ） Ｖm ＝Ｖ1 Ｖ2 ／（φ1 Ｖ2 ＋φ2 Ｖ1 ） δm ＝φ1 δ1 ＋φ2 δ2 Ｖi ：溶媒の分子容（ｍｌ／ｍｏｌ） φi ：濁点における各溶媒の体積分率 δi ：溶媒のＳＰ値 ｍｌ：低ＳＰ貧溶媒混合系 ｍｈ：高ＳＰ貧溶媒混合系 また硬化剤（架橋剤）としては、メラミン樹脂やベンゾ
グアナミン樹脂などアミノ系樹脂を用いることができる
が、上記のようにＳＰ値が水溶性アルキド樹脂や水溶性
アクリル樹脂のＳＰ値よりも０．５〜３．０の範囲で高
くなるように調製したものを用いる。水溶性アルキド樹
脂や水溶性アクリル樹脂に対して硬化剤としてＳＰ値が
この範囲にあるものを用いることによって、塗装時に水
溶性アルキド樹脂や水溶性アクリル樹脂を硬化させて塗
膜を形成するにあたって塗膜を疎水化することができ、
耐吸湿性や耐沸水性などの塗膜性能を高めることができ
るものである。硬化剤と水溶性アルキド樹脂や水溶性ア
クリル樹脂のＳＰ値の差が０．５未満（硬化剤のＳＰ値
が水溶性アルキド樹脂や水溶性アクリル樹脂のＳＰ値よ
り低い場合も含む）であると、水性塗料組成物の安定性
が悪くなって分離等が発生するおそれがあり、また逆に
このＳＰ値の差が３．０を超えると耐吸湿性や耐沸水性
などの塗膜性能を高める効果を得ることができなくな
る。Δ = (V ml 1/2 δ ml + V mh 1/2 δ mh ) /
(V ml 1/2 + V mh 1/2 ) V m = V 1 V 2 / (φ 1 V 2 + φ 2 V 1) δ m = φ 1 δ 1 + φ 2 δ 2 V i: solvent molecular volume (ml / Mol) φ i : Volume fraction of each solvent at the cloud point δ i : SP value of the solvent ml: Low SP poor solvent mixed system mh: High SP poor solvent mixed system Further, as a curing agent (crosslinking agent), melamine resin or Although an amino resin such as benzoguanamine resin can be used, the SP value is adjusted to be higher than the SP value of the water-soluble alkyd resin or the water-soluble acrylic resin in the range of 0.5 to 3.0 as described above. Use one. By using a curing agent having a SP value within this range for a water-soluble alkyd resin or a water-soluble acrylic resin, it can be applied when the water-soluble alkyd resin or water-soluble acrylic resin is cured during coating to form a coating film. The membrane can be made hydrophobic,
It is possible to enhance coating film performance such as moisture absorption resistance and boiling water resistance. The difference in SP value between the curing agent and the water-soluble alkyd resin or water-soluble acrylic resin is less than 0.5 (including the case where the SP value of the curing agent is lower than the SP value of the water-soluble alkyd resin or water-soluble acrylic resin). , The stability of the water-based coating composition may be deteriorated and separation may occur, and conversely, if the difference in SP value exceeds 3.0, coating performance such as moisture absorption resistance and boiling water resistance is increased. The effect cannot be obtained.
【００１７】上記水溶性アルキド樹脂あるいは水溶性ア
クリル樹脂、硬化剤、さらに顔料や水溶性有機溶剤等を
配合することによって、水性塗料を調製することができ
る。この顔料としては、二酸化チタン、カーボン、キナ
クリドン系等の着色顔料や、炭酸カルシウム等の体質顔
料などを用いることができるものであり、配合量はＰＶ
Ｃ＝０〜３５％程度が好ましい。また水溶性有機溶剤と
してはブチルセロソルブ等を用いることができる。ここ
で、水溶性アルキド樹脂あるいは水溶性アクリル樹脂に
対する硬化剤の配合比率は、固形分に換算して５０：５
０〜９５：５の範囲に設置するのが好ましい。A water-based paint can be prepared by blending the above-mentioned water-soluble alkyd resin or water-soluble acrylic resin, a curing agent, a pigment and a water-soluble organic solvent. As the pigment, a coloring pigment such as titanium dioxide, carbon, quinacridone, or an extender pigment such as calcium carbonate can be used.
C = 0 to about 35% is preferable. Further, butyl cellosolve or the like can be used as the water-soluble organic solvent. Here, the compounding ratio of the curing agent to the water-soluble alkyd resin or water-soluble acrylic resin is 50: 5 in terms of solid content.
It is preferably installed in the range of 0 to 95: 5.
【００１８】このように調製される水性塗料を水で希釈
することによって塗装に使用することができるものであ
る。そしてこの水性塗料をスプレー塗装する際に発生す
る塗料ダストを塗装ブース内の水に溶解乃至分散させて
捕集し、塗料を捕集した塗料希釈水を上記と同様にして
有機溶剤を添加して補充しつつ濾過して水を除去し、濃
縮して水性塗料に再生することができる。ここで、水性
塗料に配合される硬化剤としてＳＰ値が水溶性アルキド
樹脂や水溶性アクリル樹脂のＳＰ値よりも０．５〜３．
０高いものを用いることによって、塗膜を疎水化して耐
吸湿性や耐沸水性などの塗膜性能を高めるようにしてい
るために、水性塗料に配合する水溶性アルキド樹脂や水
溶性アクリル樹脂としては上記のように水溶化度が比較
的高いものを用いることができる。従って、このように
塗料希釈水を濾過して濃縮する際に水溶性アルキド樹脂
や水溶性アクリル樹脂が分離することを確実に防ぐこと
ができると共に、また塗膜性能が低下することも防ぐこ
とができるものである。The aqueous paint thus prepared can be used for painting by diluting it with water. Then, the paint dust generated when spray-painting this water-based paint is dissolved or dispersed in water in the coating booth and collected, and the paint dilution water in which the paint is collected is added with an organic solvent in the same manner as above. It can be filtered with replenishment to remove water, concentrated and regenerated into an aqueous paint. Here, the SP value as a curing agent to be added to the water-based paint is 0.5 to 3 compared to the SP value of the water-soluble alkyd resin or the water-soluble acrylic resin.
By using a high value, the coating film is made hydrophobic to improve coating performance such as moisture absorption resistance and boiling water resistance. Therefore, as a water-soluble alkyd resin or water-soluble acrylic resin to be blended in the water-based coating, Can have a relatively high degree of water solubility as described above. Therefore, it is possible to reliably prevent the water-soluble alkyd resin and the water-soluble acrylic resin from separating when the paint diluting water is filtered and concentrated in this way, and also to prevent the coating film performance from being deteriorated. It is possible.
【００１９】尚、以上では塗料希釈水に添加して補充し
つつ濾過をおこなう成分として有機溶剤を例に上げて説
明したが、本発明はこの有機溶剤に限らず、水性塗料に
配合される成分であって水と共に濾過されるものであれ
ば、何にでも適用することができるものである。次に、
本発明を実施例によって例証する。In the above description, an organic solvent is taken as an example of a component which is added to the paint diluting water and replenished while being replenished, but the present invention is not limited to this organic solvent, but a component to be added to an aqueous paint. It can be applied to anything that is filtered with water. next,
The invention is illustrated by the examples.
【００２０】（実施例１）酸価が５０、水酸基価が４
０、数平均分子量が３３００のアルキド樹脂をブチルセ
ロソルブに溶解して不揮発分が７５重量％のアルキド樹
脂ワニスを調製した。これをジメチルエタノールアミン
で理論上１００％中和して脱イオン水にて不揮発分が４
０重量％になるように調整して水溶性アルキド樹脂ワニ
スＡを得た。この水溶性アルキド樹脂ワニスＡに二酸化
チタンをラボミキサーを用いて分散し、さらに表１に示
す組成比率になるようにステンレス容器に秤量して配合
して水性塗料を調製した。(Example 1) Acid value is 50 and hydroxyl value is 4
An alkyd resin having a number average molecular weight of 3,300 was dissolved in butyl cellosolve to prepare an alkyd resin varnish having a nonvolatile content of 75% by weight. This is theoretically 100% neutralized with dimethylethanolamine and the non-volatile content is reduced to 4 with deionized water.
A water-soluble alkyd resin varnish A was obtained by adjusting the content to be 0% by weight. Titanium dioxide was dispersed in this water-soluble alkyd resin varnish A using a lab mixer, and then weighed and mixed in a stainless steel container so that the composition ratio shown in Table 1 was obtained to prepare an aqueous paint.
【００２１】この水性塗料を水で希釈して不揮発分が５
５重量％になるように調整し、図１のようにブチルセロ
ソルブとイオン交換水とを２：９８の重量比で混合した
水６を張った塗装ブース１内でスプレー塗装に供した。
そして塗装ブース１内の水６に塗料ダストが捕集されて
水中の不揮発分が１５重量％に達した時点で、水６で塗
料が希釈された塗料希釈水７を塗装ブース１から濃縮タ
ンク３に移し、これを限外濾過膜としてデサリネーショ
ンシステムズ（ＤＥＳＡＲＬＩＮＡＴＩＯＮＳＹＳＴＥ
ＭＳ）社製「ＥＷ４０２６」を用いた限外濾過装置４に
通して水を濾過して濃縮を開始した。濃縮を開始してか
ら、濃縮タンク３内の塗料希釈水７の不揮発分濃度が３
０重量％に達した時点で、１００重量部の塗料希釈水７
に対して１．０重量部の割合でブチルセロソルブを塗料
希釈水７に添加して補充し、さらに濃縮を継続して、塗
料希釈水７の不揮発分濃度が４０重量％に達した時点
で、１００重量部の塗料希釈水７に対して１．８重量部
の割合でブチルセロソルブを塗料希釈水７に添加して補
充し、さらに濃縮を継続して、塗料希釈水７の不揮発分
濃度が５０重量％に達した時点で、１００重量部の塗料
希釈水７に対して１．０重量部の割合でブチルセロソル
ブを塗料希釈水７に添加して補充し、後は不揮発分濃度
が５５重量％になるまで濾過を継続して濃縮した。This water-based paint is diluted with water to obtain a nonvolatile content of 5
It was adjusted to be 5% by weight and spray coated in a coating booth 1 filled with water 6 in which butyl cellosolve and ion-exchanged water were mixed at a weight ratio of 2:98 as shown in FIG.
Then, when the paint dust is collected in the water 6 in the coating booth 1 and the nonvolatile content in the water reaches 15% by weight, the paint diluting water 7 in which the paint is diluted with the water 6 is concentrated from the coating booth 1 to the concentration tank 3 And used it as an ultrafiltration membrane (DESARLINATION SYSTEM).
Water was filtered through an ultrafiltration device 4 using "EW4026" manufactured by MS Co., Ltd. to start concentration. Since the concentration of the nonvolatile content of the paint dilution water 7 in the concentration tank 3 has been 3
When it reaches 0% by weight, 100 parts by weight of paint dilution water 7
Butyl cellosolve was added to the paint diluting water 7 at a ratio of 1.0 part by weight to replenish, and the concentration was continued, and when the nonvolatile concentration of the paint diluting water 7 reached 40% by weight, 100 Butyl cellosolve was added to the paint diluting water 7 at a ratio of 1.8 parts by weight with respect to 7 parts by weight of the paint diluting water 7 to replenish, and the concentration was continued until the nonvolatile concentration of the paint diluting water 7 was 50% by weight. At that time, butyl cellosolve was added to the paint diluting water 7 at a ratio of 1.0 part by weight to 100 parts by weight of the paint diluting water 7 to replenish, and thereafter, the nonvolatile content concentration became 55% by weight. The filtration was continued and concentrated.
【００２２】（比較例１）濃縮をおこなうにあたってブ
チルセロソルブの補充をおこなわないで濾過するように
した他は、実施例１と同様にした。 （実施例２）酸価が３０、水酸基価が４０、数平均分子
量が３０００のアルキド樹脂をブチルセロソルブに溶解
して不揮発分が７５重量％のアルキド樹脂ワニスを調製
した。これをジメチルエタノールアミンで理論上１００
％中和して脱イオン水にて不揮発分が４０重量％になる
ように調整して水溶性アルキド樹脂ワニスＢを得た。こ
の水溶性アルキド樹脂ワニスＢに二酸化チタンをラボミ
キサーを用いて分散し、さらに表１に示す組成比率にな
るようにステンレス容器に秤量して配合して水性塗料を
調製した。(Comparative Example 1) The procedure of Example 1 was repeated, except that butyl cellosolve was not replenished for the concentration. (Example 2) An alkyd resin having an acid value of 30, a hydroxyl value of 40 and a number average molecular weight of 3000 was dissolved in butyl cellosolve to prepare an alkyd resin varnish having a nonvolatile content of 75% by weight. This is theoretically 100 with dimethylethanolamine
% And neutralized with deionized water to a nonvolatile content of 40% by weight to obtain a water-soluble alkyd resin varnish B. Titanium dioxide was dispersed in this water-soluble alkyd resin varnish B using a lab mixer, and further weighed and mixed in a stainless steel container so that the composition ratio shown in Table 1 was obtained to prepare an aqueous paint.
【００２３】この水性塗料を水で希釈して不揮発分が５
４重量％になるように調整し、実施例１と同様にしてス
プレー塗装に供した。そして塗装ブース１内の水６に塗
料ダストが捕集されて水中の不揮発分が１５重量％に達
した時点で、水６で塗料が希釈された塗料希釈水７を塗
装ブース１から濃縮タンク３に移し、これを実施例１と
同様にして濾過装置４に通して水を濾過して濃縮を開始
した。濃縮を開始してから、塗料希釈水７の不揮発分濃
度が３０重量％に達した時点で、１００重量部の塗料希
釈水７に対して１．８重量部の割合でブチルセロソルブ
を塗料希釈水７に添加して補充し、さらに濃縮を継続し
て、塗料希釈水７の不揮発分濃度が４０重量％に達した
時点で、１００重量部の塗料希釈水７に対して３．２重
量部の割合でブチルセロソルブを塗料希釈水７に添加し
て補充し、さらに濃縮を継続して、塗料希釈水７の不揮
発分濃度が５０重量％に達した時点で、１００重量部の
塗料希釈水７に対して１．８重量部の割合でブチルセロ
ソルブを塗料希釈水７に添加して補充し、後は不揮発分
濃度が５４重量％になるまで濾過を継続して濃縮した。This water-based paint is diluted with water to obtain a nonvolatile content of 5
It was adjusted to 4% by weight and spray coated in the same manner as in Example 1. Then, when the paint dust is collected in the water 6 in the coating booth 1 and the nonvolatile content in the water reaches 15% by weight, the paint diluting water 7 in which the paint is diluted with the water 6 is concentrated from the coating booth 1 to the concentration tank 3 The water was filtered through the filter device 4 in the same manner as in Example 1 to start the concentration. When the nonvolatile concentration of the paint diluting water 7 reached 30% by weight after the start of the concentration, butyl cellosolve was added to the paint diluting water 7 at a ratio of 1.8 parts by weight to 100 parts by weight of the paint diluting water 7. When the nonvolatile concentration of the paint diluting water 7 reaches 40 wt%, the ratio of 3.2 parts by weight to 100 parts by weight of the paint diluting water 7 is added. Butyl cellosolve was added to the paint diluting water 7 to replenish it, and further concentration was continued. When the nonvolatile concentration of the paint diluting water 7 reached 50% by weight, 100 parts by weight of the paint diluting water 7 was added. Butyl cellosolve was added to the paint diluting water 7 at a ratio of 1.8 parts by weight to replenish it, and thereafter, filtration was continued and concentrated until the nonvolatile content concentration became 54% by weight.
【００２４】（比較例２）濃縮をおこなうにあたってブ
チルセロソルブの補充をおこなわないで濾過するように
した他は、実施例２と同様にした。(Comparative Example 2) The procedure of Example 2 was repeated, except that butyl cellosolve was not replenished for the concentration.
【００２５】[0025]
【表１】 [Table 1]
【００２６】（実施例３）攪拌機、温度制御装置、デカ
ンターを備えた容器に次の組成の原料を仕込み、攪拌し
ながら加熱した。 大豆油脂肪酸 ３４重量部 イソフタル酸 ２５重量部 無水トリメリット酸 ９重量部 トリメチロールプロパン ３１重量部 キシレン １重量部 ジブチルスズオキサイド ０．０２重量部 反応進行に伴って生成する水をキシレンと共沸させて除
去し、酸価５０、水酸基価１２５になるまで加熱を継続
し、反応を終了させた。得られた樹脂を不揮発分７３重
量％となるようにブチルセロソルブで希釈してアルキド
樹脂ワニスを得た。この樹脂ワニスはガードナー粘度Ｚ
2 であり、ＳＰ値＝１０．３７であった。この樹脂ワニ
スをジメチルエタノールアミンで理論上１００％中和
し、脱イオン水にて不揮発分４０重量％になるように調
整して水溶性アルキド樹脂ワニスＣを得た。この水溶性
アルキド樹脂ワニスＣに二酸化チタンをラボミキサーを
用いて分散し、さらに硬化剤としてメタノール・エタノ
ール変性ベンゾグアナミン樹脂（ＳＰ値＝１１．４７）
を用いて表２に示す組成比率になるようにステンレス容
器に秤量して配合し、水性塗料を調製した。(Example 3) A raw material having the following composition was charged in a container equipped with a stirrer, a temperature controller, and a decanter, and heated with stirring. Soybean oil fatty acid 34 parts by weight Isophthalic acid 25 parts by weight Trimellitic anhydride 9 parts by weight Trimethylolpropane 31 parts by weight xylene 1 part by weight Dibutyltin oxide 0.02 parts by weight After the removal, the heating was continued until the acid value became 50 and the hydroxyl value became 125 to terminate the reaction. The obtained resin was diluted with butyl cellosolve to a nonvolatile content of 73% by weight to obtain an alkyd resin varnish. This resin varnish has a Gardner viscosity Z
It was 2 , and SP value was 10.37. This resin varnish was theoretically 100% neutralized with dimethylethanolamine and adjusted to a nonvolatile content of 40% by weight with deionized water to obtain a water-soluble alkyd resin varnish C. Titanium dioxide was dispersed in this water-soluble alkyd resin varnish C using a lab mixer, and a benzoguanamine resin modified with methanol / ethanol as a curing agent (SP value = 11.47).
Was used and weighed and mixed in a stainless steel container so that the composition ratio shown in Table 2 was obtained, to prepare an aqueous paint.
【００２７】この水性塗料を水で希釈して不揮発分が５
５重量％になるように調整し、後は実施例１と同様にし
てスプレー塗装に供すると共に、塗装ブース内の水を実
施例１と同様にブチルセロソルブを補充しつつ濾過して
不揮発分濃度が５５重量％になるまで濃縮した。 （実施例４）攪拌機、温度調節器、冷却管を備えた反応
容器にエチレングリコールモノブチルエーテル７６重量
部を仕込み、さらにスチレン１２２重量部、ラウリルメ
タクリレート６６重量部、２−ヒドロキシエチルメタク
リレート６６重量部、メタクリル酸２３重量部、アゾビ
スイソブチルニトリル３重量部からなるモノマー溶液を
６１重量部添加して、攪拌下温度を１２０℃に調整し
た。さらにこのモノマー溶液２４５重量部を３時間で滴
下した後、攪拌を１時間継続した。そしてこれにジメチ
ルエタノールアミン２４重量部と脱イオン水２００重量
部を添加することによって、揮発分５０重量％、樹脂の
数平均分子量が６０００の水溶性アクリル樹脂ワニスＤ
を得た。この樹脂は酸価５０、水酸基価９５、ＳＰ値１
０．５であった。この水溶性アクリル樹脂ワニスＤに二
酸化チタンをラボミキサーを用いて分散し、さらに硬化
剤としてメタノール・エタノール変性ベンゾグアナミン
樹脂（ＳＰ値＝１１．４７）を用いて表２に示す組成比
率になるようにステンレス容器に秤量して配合し、水性
塗料を調製した。This water-based paint is diluted with water to obtain a nonvolatile content of 5
The content was adjusted to 5% by weight, and thereafter, spray coating was carried out in the same manner as in Example 1, and the water in the coating booth was filtered while supplementing with butyl cellosolve as in Example 1 to obtain a nonvolatile content of 55. Concentrated to wt%. (Example 4) 76 parts by weight of ethylene glycol monobutyl ether was charged into a reaction vessel equipped with a stirrer, a temperature controller, and a cooling tube, and 122 parts by weight of styrene, 66 parts by weight of lauryl methacrylate, 66 parts by weight of 2-hydroxyethyl methacrylate, 61 parts by weight of a monomer solution consisting of 23 parts by weight of methacrylic acid and 3 parts by weight of azobisisobutylnitrile was added, and the temperature was adjusted to 120 ° C. under stirring. Further, 245 parts by weight of this monomer solution was added dropwise over 3 hours, and stirring was continued for 1 hour. Then, by adding 24 parts by weight of dimethylethanolamine and 200 parts by weight of deionized water, a water-soluble acrylic resin varnish D having a volatile content of 50% by weight and a resin number average molecular weight of 6000.
Got This resin has an acid value of 50, a hydroxyl value of 95, and an SP value of 1.
It was 0.5. Titanium dioxide was dispersed in this water-soluble acrylic resin varnish D using a lab mixer, and further methanol / ethanol modified benzoguanamine resin (SP value = 11.47) was used as a curing agent so that the composition ratios shown in Table 2 were obtained. A stainless steel container was weighed and blended to prepare an aqueous paint.
【００２８】この水性塗料を水で希釈して不揮発分が５
５重量％になるように調整し、後は実施例１と同様にし
てスプレー塗装に供すると共に、塗装ブース内の水を実
施例１と同様にブチルセロソルブを補充しつつ濾過して
不揮発分濃度が５５重量％になるまで濃縮した。This water-based paint is diluted with water to obtain a nonvolatile content of 5
The content was adjusted to 5% by weight, and thereafter, spray coating was carried out in the same manner as in Example 1, and the water in the coating booth was filtered while supplementing with butyl cellosolve as in Example 1 to obtain a nonvolatile content of 55. Concentrated to wt%.
【００２９】[0029]
【表２】 [Table 2]
【００３０】上記実施例１乃至４及び比較例１，２にお
いて使用される初期の水性塗料と、濃縮して回収した水
性塗料について、塗料中の有機溶剤（ブチルセロソル
ブ）と水との重量比をガスクロマトグラフィで分析し、
またそれぞれの塗料の状態を観察した。また初期の水性
塗料と濃縮して回収した水性塗料をそれぞれリン酸亜鉛
処理板（日本テストパネル社製、厚さ０．８ｍｍ）上に
乾燥塗膜膜厚が２５〜３０μｍになるようにスプレーし
て、１６０℃で２０分間焼き付けた。この塗膜について
性能試験をして耐沸水性及び耐湿性を測定した。これら
の結果を表３及び表４に示す。Regarding the initial aqueous paint used in Examples 1 to 4 and Comparative Examples 1 and 2 and the concentrated and recovered aqueous paint, the weight ratio of the organic solvent (butyl cellosolve) and water in the paint was changed to gas. Analyzed by chromatography,
Moreover, the state of each paint was observed. The initial aqueous paint and the concentrated and recovered aqueous paint were sprayed onto a zinc phosphate treated plate (manufactured by Nippon Test Panel Co., Ltd., thickness 0.8 mm) so that the dry coating film thickness was 25 to 30 μm. And baked at 160 ° C. for 20 minutes. The coating film was subjected to a performance test to measure boiling water resistance and moisture resistance. The results are shown in Tables 3 and 4.
【００３１】[0031]
【表３】 [Table 3]
【００３２】[0032]
【表４】 [Table 4]
【００３３】表３及び表４にみられるように、各実施例
のものは回収した水性塗料中の有機溶剤と水の比が初期
の水性塗料とほぼ等しくなっており、回収した水性塗料
に分離は発生せず、この回収塗料を塗装して得られる塗
膜も良好なものであることが確認される。これに対し
て、各比較例のものは回収した水性塗料中の有機溶剤と
水の比が初期の水性塗料と大きく異なっており、回収し
た水性塗料に分離が発生して良好な塗膜が得られなかっ
た。また各比較例のものではこの様に良好な塗膜が得ら
れないので塗膜の性能試験ができなかった。また、比較
例１，２のものでは、回収した水性塗料に有機溶剤（ブ
チルセロソルブ）を追加して有機溶剤の含有量を初期の
水性塗料に合わせるようにしても、塗料分離の状態に変
わりはなかった。As can be seen from Tables 3 and 4, the ratio of the organic solvent to the water in the recovered water-based paint of each of the examples is almost equal to that of the initial water-based paint, and the recovered water-based paint is separated. It does not occur and it is confirmed that the coating film obtained by applying this recovered paint is also good. On the other hand, in each comparative example, the ratio of the organic solvent and water in the recovered water-based paint was significantly different from that in the initial water-based paint, and separation occurred in the recovered water-based paint to obtain a good coating film. I couldn't do it. Further, in the case of each comparative example, such a good coating film could not be obtained, so that the performance test of the coating film could not be conducted. Further, in Comparative Examples 1 and 2, even if an organic solvent (butyl cellosolve) is added to the recovered water-based paint to adjust the content of the organic solvent to the initial water-based paint, the state of paint separation does not change. It was
【００３４】[0034]
【発明の効果】上記のように本発明は、水性塗料を水中
に捕集させて得られる塗料希釈水を濾過し、水を除去す
ることによって濃縮するにあたって、水性塗料に配合さ
れており水と共に濾過される成分、すなわち有機溶剤を
塗料希釈水に添加して補充しつつ濾過をおこなうように
したので、塗料希釈水を濾過して濃縮する際に有機溶剤
などの成分が水と共に濾過されても、有機溶剤などの成
分の補充によって濃縮して回収した水性塗料中の有機溶
剤などの成分の含有量を元の水性塗料の含有量と同等に
保つことができるものであり、有機溶剤などの成分の含
有量が低下する場合のように塗料分離が発生するような
おそれなく、塗料希釈水を濃縮して水性塗料を回収する
ことができるものである。Industrial Applicability As described above, according to the present invention, when the paint dilution water obtained by collecting the water-based paint in water is filtered and concentrated by removing water, the water is mixed with the water-based paint. Since the components to be filtered, that is, the organic solvent is added to the paint diluting water to replenish it while performing the filtration, even when components such as the organic solvent are filtered together with water when the paint diluting water is filtered and concentrated. The content of components such as organic solvent in the water-based paint that is concentrated and recovered by replenishing components such as organic solvent can be kept equal to the content of the original water-based paint. It is possible to recover the water-based paint by concentrating the paint-diluting water without fear of causing paint separation as in the case where the content of the paint decreases.
【図１】本発明に用いる塗料の濃縮回収再生使用のシス
テムの一例を示す概略図である。FIG. 1 is a schematic view showing an example of a system for concentrated recovery and reuse of paint used in the present invention.
１ 塗装ブース ２ スプレー機 ３ 濃縮タンク ４ 濾過装置 ５ 濾液タンク ６ 水 ７ 塗料希釈水 ８ 有機溶剤 ９ 溶剤タンク 1 Painting booth 2 Sprayer 3 Concentration tank 4 Filtration device 5 Filtrate tank 6 Water 7 Paint dilution water 8 Organic solvent 9 Solvent tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長崎 正博 大阪府寝屋川市池田中町19番17号 日本ペ イント株式会社内 (72)発明者 楫野 哲郎 大阪府寝屋川市池田中町19番17号 日本ペ イント株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Masahiro Nagasaki 19-17 Ikedanaka-cho, Neyagawa-shi, Osaka Japan Paint Co., Ltd. (72) Inventor Tetsuro Fusano 19-17 Ikedanaka-cho, Neyagawa-shi, Osaka Japan Into Inc.
Claims (3)
料希釈水を濾過し、水を除去することによって濃縮する
にあたって、水性塗料に配合されており水と共に濾過さ
れる成分を塗料希釈水に添加して補充しつつ濾過をおこ
なうことを特徴とする水性塗料の濃縮方法。1. A component which is mixed with water and is filtered together with water in order to concentrate the water by diluting the paint dilution water obtained by collecting the water-based paint in water and removing the water. A method for concentrating a water-based paint, which comprises adding to and replenishing with water to perform filtration.
ることを特徴とする請求項１に記載の水性塗料の濃縮方
法。2. The method of concentrating an aqueous paint according to claim 1, wherein the component filtered with water is an organic solvent.
水酸基価が３５〜２００、ＳＰ値が１０．０〜１１．０
の水溶性アルキド樹脂あるいは水溶性アクリル樹脂を主
成分とし、水溶性アルキド樹脂あるいは水溶性アクリル
樹脂のＳＰ値より０．５〜３．０高いＳＰ値を有する硬
化剤を配合して調製されるものを用いることを特徴とす
る請求項１又は２に記載の水性塗料の濃縮方法。3. A water-based paint having an acid value of 25 to 100,
Hydroxyl value is 35-200, SP value is 10.0-11.0
Prepared by mixing a water-soluble alkyd resin or a water-soluble acrylic resin as a main component with a curing agent having an SP value higher by 0.5 to 3.0 than the SP value of the water-soluble alkyd resin or water-soluble acrylic resin. The method for concentrating an aqueous paint according to claim 1 or 2, characterized by using.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4021522A JPH05214267A (en) | 1992-02-07 | 1992-02-07 | Process of concentrating water-based coating material |
| DE69313314T DE69313314T3 (en) | 1992-02-07 | 1993-02-04 | Use of aqueous paint compositions |
| EP93101730A EP0554865B2 (en) | 1992-02-07 | 1993-02-04 | Use of water-based paint composition |
| AT93101730T ATE157387T1 (en) | 1992-02-07 | 1993-02-04 | USE OF AQUEOUS PAINT COMPOSITIONS |
| US08/015,406 US5319017A (en) | 1992-02-07 | 1993-02-05 | Water-based paint composition |
| CA002088854A CA2088854A1 (en) | 1992-02-07 | 1993-02-05 | Water-based paint composition |
| KR1019930001683A KR100247519B1 (en) | 1992-02-07 | 1993-02-08 | Water-based paint composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4021522A JPH05214267A (en) | 1992-02-07 | 1992-02-07 | Process of concentrating water-based coating material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05214267A true JPH05214267A (en) | 1993-08-24 |
Family
ID=12057289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4021522A Withdrawn JPH05214267A (en) | 1992-02-07 | 1992-02-07 | Process of concentrating water-based coating material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05214267A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2802448A1 (en) | 1999-12-21 | 2001-06-22 | Nippon Paint Co Ltd | WATER-BASED PAINT RECYCLING PROCESS |
-
1992
- 1992-02-07 JP JP4021522A patent/JPH05214267A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2802448A1 (en) | 1999-12-21 | 2001-06-22 | Nippon Paint Co Ltd | WATER-BASED PAINT RECYCLING PROCESS |
| US6497751B2 (en) | 1999-12-21 | 2002-12-24 | Nippon Paint Co., Ltd. | Water-based paint recycling method |
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| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |