WO2015141666A1 - 湿式塗装ブース循環水処理剤 - Google Patents
湿式塗装ブース循環水処理剤 Download PDFInfo
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- WO2015141666A1 WO2015141666A1 PCT/JP2015/057877 JP2015057877W WO2015141666A1 WO 2015141666 A1 WO2015141666 A1 WO 2015141666A1 JP 2015057877 W JP2015057877 W JP 2015057877W WO 2015141666 A1 WO2015141666 A1 WO 2015141666A1
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- WIPO (PCT)
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- circulating water
- treatment agent
- tannin
- paint booth
- paint
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
- B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/71—Paint detackifiers or coagulants, e.g. for the treatment of oversprays in paint spraying installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/14—Paint wastes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/262—Alkali metal carbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
Definitions
- the present invention relates to a wet paint booth circulating water treatment agent. More specifically, the present invention reduces the adhesiveness of the unpainted paint collected in the wet paint booth circulating water and can prevent the unpainted paint from sticking and solidifying to the inner wall of the waterway, etc. It relates to paint booth circulating water treatment agent.
- the painting booth is a production facility necessary for painting work that is configured to discharge spray mist.
- the painting booth has a function to properly discharge organic solvents generated during spraying work to the outdoors, an effective capture function for unpainted paint generated by overspray, and dust on the coating to improve the coating quality.
- Appropriate functions for generating suction air speed to prevent adhesion and protect the human hygiene environment are required.
- unpainted paint is collected with circulating water.
- the uncoated paint collected in the circulating water is highly sticky and may adhere to the water curtain plate, piping system, spray nozzle, etc. of the coating booth, causing clogging and reducing the washing efficiency.
- an alkali agent such as caustic soda, a zeolite and a cationic polymer or an amphoteric metal compound
- Patent Document 1 a non-adhesive agent comprising a melamine formaldehyde condensate and a dispersant comprising a bentonite mineral.
- a modified tannin compound obtained by reacting condensed tannin with both an amino compound and an aldehyde under acidic conditions.
- Patent Document 4 A treatment agent comprising a polymer and a diallyldialkyl quaternary ammonium polymer or a polymer derived from a hydrophilic-lipophilic quaternary ammonium repeating unit (Patent Document 4) has been proposed.
- Japanese Patent Laid-Open No. 11-672 JP 2011-218257 A Japanese Patent Laid-Open No. 08-182901 Japanese Patent Laid-Open No. 02-28272 JP 05-269470 A
- Patent Document 3 or 5 discloses unmodified tannin as an example of a coagulant used in combination with a non-tackifying agent.
- Patent Document 2, 4 or 5 discloses modified tannin as an example of a non-tackifying agent.
- tannin or modified tannin is insufficient in the tack-free or cohesive effect of the paint.
- the addition of tannin lowers the pH of the circulating water and thus easily causes corrosion of the equipment.
- the purpose of the present invention is to reduce the adhesiveness of the unpainted paint collected in the circulating water of the wet paint booth, and prevent the unpainted paint from sticking and solidifying to the inner wall of the waterway, etc. It is to provide a circulating water treatment agent.
- a wet paint booth circulating water treatment agent comprising an aqueous solution containing tannin and an alkali metal hydroxide and / or an alkali metal carbonate.
- the treating agent according to [1], wherein the tannin is mimosa tannin and / or quebracho tannin.
- the adhesiveness of the uncoated paint collected in the wet coating booth circulating water is reduced, and the uncoated paint is solidified on the inner wall of the water channel. Can be effectively prevented, and the equipment is hardly corroded.
- the solubility of tannin in water is low at low pH and high at high pH.
- the aqueous solution constituting the treatment agent of the present invention preferably contains tannin at a concentration of 10 to 30% by mass.
- this treating agent is added to the circulating water, the pH is lowered by dilution. A part of tannin precipitates due to a decrease in pH. Precipitated tannin is fine and has a large specific surface area. Therefore, it is considered that non-coated paint droplets are coated to make it non-tacky.
- the wet paint booth circulating water treatment agent according to the present invention is an aqueous solution containing tannin and an alkali metal hydroxide and / or alkali metal carbonate.
- Tannin used in the present invention is a plant-derived water-soluble compound that reacts with and binds to proteins, alkaloids, or metal ions to form a hardly soluble salt. Tannins are roughly classified into condensed (catechol-based) tannins and hydrolyzed (pyrogallol-type) tannins. Condensed tannin is a polymer of a compound whose main component has a phenol skeleton. Extracted from conifers / hardwoods such as mimosa, acacia, larch, quebracho, Gambia, oysters. The pH is 4.2 to 4.5.
- the hydrolyzable tannin is an ester of an aromatic carboxylic acid as a main component.
- the tannin used in the present invention is preferably condensed tannin, more preferably mimosa tannin and / or quebracho tannin.
- the wet coating booth circulating water treatment agent of the present invention has a tannin concentration in the aqueous solution of preferably 10 to 30% by mass, more preferably 20 to 30% by mass. If the tannin concentration is too low, the tannin concentration will be low as a product and the distribution cost will be high.
- alkali metal hydroxide and / or alkali metal carbonate used in the present invention examples include sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate and the like.
- the content of the alkali metal hydroxide and / or alkali metal carbonate in the aqueous solution is such that the pH of the aqueous solution is preferably 10 to 13, more preferably 10.5 to 11.5. If the content of the alkali metal hydroxide and / or alkali metal carbonate is too small, the treatment effect tends to decrease.
- the wet paint booth to which the wet paint booth circulating water treatment agent of the present invention can be applied is not particularly limited in its form, and may be a dispersion type or a floating type.
- the wet paint booth circulating water treatment agent according to the present invention is supplied to the painting booth from the water tank, collects the uncoated paint, and then returns to the water tank. Add to water.
- the addition amount of the wet coating booth circulating water treatment agent according to the present invention can be appropriately adjusted according to the non-adhesive state of the non-coating paint.
- the wet paint booth circulating water treatment agent according to the present invention adheres to the non-coated paint, becomes non-tacky, and is discharged out of the system together with the paint sludge in the sludge separation process, so that an appropriate amount is replenished accordingly. It is preferable to do.
- a coagulant to the circulating water together with the wet paint booth circulating water treatment agent according to the present invention.
- the coagulant has a function of neutralizing the electric charge of fine particles in water to coagulate.
- the coagulant is roughly classified into an organic coagulant and an inorganic coagulant.
- Organic coagulants include sodium alginate; chitin / chitosan coagulants; biocoagulants such as TKF04 and BF04; polyethyleneimine, cation-modified polyacrylamide, polyamine, polyaminesulfone, polyamide, polyalkylene / polyamine, amine cross-linked polycondensation Dimethylaminoethyl acrylate, dimethyldiallylammonium chloride, condensate of alkylamine and epichlorohydrin, condensate of alkylene dichloride and polyalkylenepolyamine, condensate of dicyandiamide and formalin, DAM (dimethylaminoethyl methacrylate homopolymer or A cationic polymer coagulant such as a copolymer).
- the cationic polymer coagulant is composed of a cationic polymer having a weight average molecular weight of preferably 1,000 to 1,000,000, more preferably 5,000 to 300,000.
- Inorganic coagulants include aluminum coagulants such as aluminum sulfate (sulfuric acid band), polyaluminum chloride (PAC), polyaluminum hydroxychloride, pseudoboehmite alumina sol (AlO (OH)); ferrous hydroxide, ferrous sulfate Iron salt-based coagulants such as iron, ferric chloride, polyferric sulfate, and iron-silica inorganic polymer coagulants; zinc-based coagulants such as zinc chloride; activated silicic acid, polysilica iron coagulants, etc. .
- aluminum coagulants such as aluminum sulfate (sulfuric acid band), polyaluminum chloride (PAC), polyaluminum hydroxychloride, pseudoboehmite alumina sol (AlO (OH)
- ferrous hydroxide ferrous sulfate
- Iron salt-based coagulants such as iron, ferric chloride, polyferric sulfate, and iron
- the amount of the coagulant added to the circulating water can be appropriately adjusted according to the formation state of the coagulation floc of the uncoated paint.
- the amount of the coagulant added to the circulating water is preferably 0.01 to 30 parts by mass, more preferably 0.5 to 20 parts by mass with respect to 100 parts by mass of tannin.
- the amount added is, for example, preferably 0.01 to 20 parts by mass, more preferably 0.5 to 10 parts by mass with respect to 100 parts by mass of tannin.
- the addition amount of the cationic polymer coagulant is preferably 0.001 to 1 meq / L, more preferably 0.002 to 0.5 meq / L, for example, as a colloid equivalent value with respect to circulating water.
- the amount added is preferably 0.01 to 100 parts by mass, more preferably 1 to 50 parts by mass in terms of metal oxide with respect to 100 parts by mass of tannin.
- a polymer flocculant can be further added to the circulating water in order to form coarse floc.
- the polymer flocculant is composed of an anionic, cationic or amphoteric polymer.
- Such a polymer has a weight average molecular weight of usually more than 1 million, preferably 5 million or more.
- Examples of the polymer flocculant comprising an anionic polymer include sodium polyacrylate, polyacrylic acid soda amide derivative, polyacrylamide partial hydrolyzate, partially sulfomethylated polyacrylamide, and poly (2-acrylamide) -2-methylpropane sulfate. Etc.
- Examples of the polymer flocculant made of a cationic polymer include polyaminoalkyl acrylate, polyaminoalkyl methacrylate, polyethyleneimine, halogenated polydiallylammonium, chitosan, urea-formalin resin and the like.
- Examples of the polymer flocculant made of an amphoteric polymer include a copolymer of acrylamide, aminoalkyl methacrylate and sodium acrylate.
- the amount of the polymer flocculant added can be appropriately adjusted according to the formation state of the coarse floc.
- the amount of the polymer flocculant added is, for example, preferably 0.01 to 20 parts by mass, more preferably 0.5 to 10% by weight with respect to 100 parts by mass of tannin.
- the amount of the polymer flocculant added is, for example, preferably 0.001 to 1 meq / L, more preferably 0.002 to 0.5 meq / L as a colloid equivalent value with respect to circulating water.
- non-tackifying agents can be added to the circulating water together with the wet paint booth circulating water treatment agent according to the present invention.
- examples of other non-tackifying agents include alumina sol, sepiolite, melamine formaldehyde resin, phenol formaldehyde resin, bentonite, hectorite, linear cationic polyamine, sodium zincate and the like.
- the solidified flocs or coarse flocs produced by the above method are separated and removed from the circulating water by a known method. In this way, water circulated through the wet painting booth can be removed.
- Example 1 A water treatment agent A consisting of an aqueous solution containing 10% mimosa tannin and 1.6% NaOH was prepared.
- the water treatment agent A had almost no odor and had a pH of 10.4.
- coagulant A 50% solution of alkylamine / epichlorohydrin condensate
- 300 ml of tap water, 1 ml of water-based silver paint for automobile body, and 0.3 ml of water treatment agent A was put on, covered, and shaken 60 times / 30 seconds.
- the treated water obtained had a pH of 7.9 and a charge of -0.020 meq / L.
- Treatment E consisting of an aqueous solution containing 10% of mimosa tannin was prepared.
- the pH of the processing agent E was 4.8.
- Treated water was obtained in the same manner as in Example 1 except that the treating agent A was changed to the treating agent E and the amount of the coagulant A was changed to 0.02 ml, and the pH, charge, foamability, turbidity and Secondary aggregation was evaluated. The results are shown in Table 1. Note that the amount of the coagulant A is reduced in order to align the charging conditions with those of the first embodiment.
- Treating water was obtained in the same manner as in Example 1 except that treating agent A was replaced with treating agent E and 0.1 ml of a 2.5% NaOH aqueous solution was further added, and the pH, charge, foamability, and turbidity of the treating water were obtained. And the secondary aggregation property was evaluated. The results are shown in Table 1. The addition of the 2.5% NaOH aqueous solution is for the purpose of aligning the pH and charge conditions with those of Example 1.
- Comparative Example 3 Treated water was obtained in the same manner as in Example 1 except that the amount of the treating agent A was changed to zero and the amount of the coagulant A was changed to zero, and the pH, charge, foamability, turbidity, and secondary of the treated water Aggregation was evaluated. The results are shown in Table 1.
- the treatment agent according to the present invention can effectively remove water. Moreover, the treated water obtained has low foaming and the foam disappears quickly. On the other hand, the conventional tannin aqueous solution (Comparative Example 1 or 2) cannot sufficiently turbidize water. Also, the treated water obtained has a slow disappearance of bubbles.
- Treatment agent B consisting of an aqueous solution containing 22% quebracho tannin and 4.8% NaOH was prepared.
- the pH of treatment agent B was 10.8.
- a treating agent B ′ comprising an aqueous solution containing 10% quebracho tannin and 1.6% NaOH was prepared.
- Treatment agent B ′ had almost no odor.
- the treating agent B or B ′ seems to have the same detackifying effect as the treating agent A.
- Example 3 A treating agent C consisting of an aqueous solution containing 10% acacia tannin and 1.6% NaOH was prepared. Treatment C had a strong ammonia-like odor. Treatment agent C is considered to have the same tack-free effect as treatment agent A, but its workability is likely to be lower than treatment agent A due to its odor.
- FIG. 1 The outline of the wet painting booth will be described with reference to FIG.
- the wet paint booth shown in FIG. 1 is provided with a paint spray gun S at the top so that paint can be sprayed at 5 g / min.
- Circulating water is stored in a pit (water tank: total volume of 50 L) 5, the circulating water is pumped up at 100 L / min by the pump P, and the circulating water is flown in a curtain shape on the water curtain plate 4 and returned to the pit.
- a treating agent, a coagulant, or a polymer flocculant can be added to the circulating water at the treating agent supply unit 6. Further, the exhaust fan F can suck out volatile components such as solvent vapor from the booth.
- Example 4 The wet coating booth shown in FIG. First, 10 ml of the treatment agent A and 0.6 ml of the coagulant A were added from the treatment agent supply unit 6 and circulated with a pump until the treatment agent A and the coagulant A were uniformly distributed in the circulating water. A solvent-based intermediate coating gray paint for automobile bodies was sprayed from the paint spray gun S at 5 g / min. When 4 minutes had elapsed, the spraying of the paint was stopped.
- Comparative Example 4 Spraying was performed in the same manner as in Example 4 except that the processing agent A was changed to the processing agent E and 3 ml of 2.5% NaOH aqueous solution was further added. After spraying was stopped, the pH and charge of the circulating water were measured. Further, the stickiness of sludge that floated on the surface of the circulating water accumulated in the pits was evaluated by finger touch with the same index as in Example 4. The results are shown in Table 2.
- Comparative Example 5 Spraying was performed in the same manner as in Example 4 except that the amount of treatment agent A was changed to zero and the amount of coagulant A was changed to zero. After spraying was stopped, the pH and charge of the circulating water were measured. Further, the stickiness of sludge that floated on the surface of the circulating water accumulated in the pits was evaluated by finger touch with the same index as in Example 4. The results are shown in Table 2.
- Example 5 The wet coating booth shown in FIG. First, 4.8 ml of the processing agent B was added from the processing agent supply unit 6 and circulated with a pump until the processing agent B was evenly distributed in the circulating water. A solvent-based white paint for automobile bodies was sprayed from the paint spray gun S at 5 g / min. Spraying was stopped after 4 minutes. After spraying was stopped, the pH and charge of the circulating water were measured. Further, the stickiness of sludge that floated on the surface of the circulating water accumulated in the pits was evaluated by finger touch with the same index as in Example 4. The results are shown in Table 2.
- Comparative Example 6 Spraying was performed in the same manner as in Example 5 except that the amount of treatment agent B was changed to zero. After spraying was stopped, the pH and charge of the circulating water were measured. Further, the stickiness of sludge that floated on the surface of the circulating water accumulated in the pits was evaluated by finger touch with the same index as in Example 4. The results are shown in Table 2.
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
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Abstract
Description
本発明の目的は、湿式塗装ブース循環水に捕集された未塗着塗料の粘着性を低下させ、水路内壁等に未塗着塗料が粘着固化するのを防止することができる、湿式塗装ブース循環水処理剤を提供することである。
〔2〕タンニンが、ミモザタンニンおよび/またはケブラチョタンニンである〔1〕に記載の処理剤。
〔3〕水溶液のpHが10~13である、〔1〕または〔2〕に記載の処理剤。
〔4〕水溶液におけるタンニン濃度が10~30質量%である、〔1〕~〔3〕のいずれかひとつに記載の処理剤。
〔1〕~〔4〕のいずれかひとつに記載の処理剤を前記循環水に添加して、該循環水に捕集された未塗着塗料を不粘着化させることを含む、湿式塗装ブース循環水の処理方法。
〔6〕凝結剤を前記循環水に添加することをさらに含む、〔5〕に記載の湿式塗装ブース循環水の処理方法。
〔7〕高分子凝集剤を前記循環水に添加することをさらに含む、〔5〕または〔6〕に記載の湿式塗装ブース循環水の処理方法。
縮合型タンニンは、主成分がフェノール骨格を持つ化合物の重合体である。ミモザ、アカシア、カラマツ、ケブラチョ、ガンビア、カキなどの針葉樹/広葉樹から抽出される。pHは4.2~4.5を示す。
一方、加水分解型タンニンは、主成分が芳香族カルボン酸のエステルである。チェストナット、オーク、タラ、茶、ミラボラム、五倍子、没食子などの双子葉植物から抽出される。pHは2.3~4.5を示す。本発明に用いられるタンニンとしては、縮合型タンニンが好ましく、ミモザタンニンおよび/またはケブラチョタンニンがより好ましい。
有機凝結剤としては、アルギン酸ソーダ;キチン・キトサン系凝結剤;TKF04株、BF04などのバイオ凝結剤;ポリエチレンイミン、カチオン変性ポリアクリルアミド、ポリアミン、ポリアミンスルホン、ポリアミド、ポリアルキレン・ポリアミン、アミン架橋重縮合体、ポリアクリル酸ジメチルアミノエチル、ジメチルジアリルアンモニウムクロライド、アルキルアミンとエピクロルヒドリンの縮合物、アルキレンジクロライドとポリアルキレンポリアミンの縮合物、ジシアンジアミドとホルマリンの縮合物、DAM(ジメチルアミノエチルメタアクリレートのホモポリマー又はコポリマー)などのカチオン系高分子凝結剤などが挙げられる。カチオン系高分子凝結剤は、例えば、重量平均分子量が、好ましくは1千以上100万以下、より好ましくは5千以上30万以下のカチオン性ポリマーからなるものである。
カチオン系高分子凝結剤を使用する場合、その添加量は、例えば、タンニン100質量部に対して、好ましくは0.01~20質量部、より好ましくは0.5~10質量部である。また、カチオン系高分子凝結剤の添加量は、例えば、循環水に対するコロイド当量値として、好ましくは0.001~1meq/L、より好ましくは0.002~0.5meq/Lである。
無機凝結剤を使用する場合、その添加量は、タンニン100質量部に対して金属酸化物換算で、好ましくは0.01~100質量部、より好ましくは1~50質量部である。
本発明においては、粗大フロックの形成のために、高分子凝集剤を前記循環水にさらに添加することができる。高分子凝集剤は、アニオン、カチオンまたは両性のポリマーからなるものである。係るポリマーは、重量平均分子量が、通常、100万超、好ましくは500万以上のものである。
アニオンポリマーからなる高分子凝集剤としては、ポリアクリル酸ナトリウム、ポリアクリル酸ソーダ・アミド誘導体、ポリアクリルアミド部分加水分解物、部分スルホメチル化ポリアクリルアミド、ポリ(2-アクリルアミド)-2-メチルプロパン硫酸塩などが挙げられる。
カチオンポリマーからなる高分子凝集剤としては、ポリアミノアルキルアクリレート、ポリアミノアルキルメタクリレート、ポリエチレンイミン、ハロゲン化ポリジアリルアンモニウム、キトサン、尿素-ホルマリン樹脂などが挙げられる。
両性ポリマーからなる高分子凝集剤としては、アクリルアミドとアミノアルキルメタクリレートとアクリル酸ナトリウムの共重合体などが挙げられる。
実施例1
ミモザタンニン10%およびNaOH1.6%を含有する水溶液からなる水処理剤Aを調製した。該水処理剤Aは、臭気が殆んど無く、pHが10.4であった。
得られた処理水は、pHが7.9、荷電が-0.020meq/Lであった。
処理水全量を1Lメスシリンダーに入れ、散気球をメスシリンダーの中の底に設置し、1.5L/minで空気を送り、バブリングさせた。バブリング開始から2分経過時の泡量又は泡量が700mlになるまでの秒数を測定した。
泡量700mlに達した時又はバブリング開始から2分経過時にバブリングを停止した。バブリング停止から2分経過時の泡量と、泡が完全に消えるまでの時間(分)を測定した。
処理水をワットマンNo41ろ紙(粒子保持能20~25ミクロン)を使用してろ過した。得られたろ液の濁度を測定した。
処理水に、エマルション高分子凝集剤(アクリルアミド・2(アクリロイルオキシ)エチルトリメチルアンモニウムクロライド共重合物)の1%希釈液1mlを添加した。2次凝集の状態を観察した。フロック径1mm以上の場合を「良好」、フロック径1mm未満の場合を「不良」と評価した。
ミモザタンニン10%を含有する水溶液からなる処理剤Eを調製した。処理剤EのpHは4.8であった。
処理剤Aを処理剤Eに変え、凝結剤Aの量を0.02mlに変えた以外は実施例1と同じ方法で処理水を得、該処理水のpH、荷電、発泡性、濁度および2次凝集性を評価した。結果を表1に示す。なお、凝結剤Aの減量は、荷電の条件を実施例1とそろえるためである。
処理剤Aを処理剤Eに変え、2.5%NaOH水溶液0.1mlをさらに加えた以外は実施例1と同じ方法で処理水を得、該処理水のpH、荷電、発泡性、濁度および2次凝集性を評価した。結果を表1に示す。なお、2.5%NaOH水溶液の添加は、pH、荷電の条件を実施例1とそろえるためである。
処理剤Aの量をゼロに変え、凝結剤Aの量をゼロに変えた以外は実施例1と同じ方法で処理水を得、該処理水のpH、荷電、発泡性、濁度および2次凝集性を評価した。結果を表1に示す。
これに対して、従来技術であるタンニン水溶液(比較例1または2)は、十分な水の除濁ができない。また、得られる処理水は、泡の消えるのが遅い。
ケブラチョタンニン22%およびNaOH4.8%を含有する水溶液からなる処理剤Bを調製した。処理剤BのpHは10.8であった。
ケブラチョタンニン10%およびNaOH1.6%を含有する水溶液からなる処理剤B’を調製した。処理剤B’は、臭気が殆んど無かった。処理剤BまたはB’は、不粘着化効果が処理剤Aと同程度と思われる。
アカシアタンニン10%およびNaOH1.6%を含有する水溶液からなる処理剤Cを調製した。処理剤Cは、強いアンモニア様の臭いがあった。処理剤Cは、不粘着化効果が処理剤Aと同程度と思われるが、作業性が臭いのために処理剤Aよりも低いと思われる。
(湿式塗装ブース)
図1を参照して湿式塗装ブースの概要を説明する。図1に示す湿式塗装ブースは、上部に塗料スプレーガンSが設置されていて、塗料を5g/minで噴霧できるようになっている。ピット(水槽:循環水の総体積50L)5に循環水が貯められており、ポンプPで循環水を100L/minで汲み上げ、水幕板4に循環水をカーテン状に流し、ピットに戻すことができる。処理剤供給部6にて処理剤、凝結剤または高分子凝集剤を循環水に添加することができる。また、排気ファンFにて、溶剤蒸気などの揮発分をブースから吸い出すことができる。
図1に示す湿式塗装ブースにおいて実施した。まず、処理剤供給部6から処理剤A 10ml、および凝結剤A 0.6mlを添加し、循環水に処理剤Aおよび凝結剤Aが均一に行き渡るまでポンプで循環させた。自動車ボデー用溶剤系中塗りグレー塗料を塗料スプレーガンSから5g/minで噴霧した。4分経過した時に塗料の噴霧を止めた。
◎: 粘着なし
○: 粘着ないが、捏ねると容易に固まる
△: やや粘着あり
×: 粘着大
以上の結果を表2に示す。
処理剤Aを処理剤Eに変え、2.5%NaOH水溶液3mlをさらに加えた以外は実施例4と同じ方法で噴霧を行った。
噴霧停止後に循環水のpHおよび荷電を測定した。また、ピットに溜まっている循環水の液面に浮上したスラッジの粘着性を指触にて実施例4と同じ指標で評価した。結果を表2に示す。
処理剤Aの量をゼロに変え、凝結剤Aの量をゼロに変えた以外は実施例4と同じ方法で噴霧を行った。噴霧停止後に循環水のpHおよび荷電を測定した。また、ピットに溜まっている循環水の液面に浮上したスラッジの粘着性を指触にて実施例4と同じ指標で評価した。結果を表2に示す。
図1に示す湿式塗装ブースにおいて実施した。まず、処理剤供給部6から処理剤B 4.8mlを添加し、循環水に処理剤Bが均一に行き渡るまでポンプで循環させた。自動車ボデー用溶剤系ホワイト塗料を塗料スプレーガンSから5g/minで噴霧した。4分経過した時に噴霧を止めた。
噴霧停止後に循環水のpHおよび荷電を測定した。また、ピットに溜まっている循環水の液面に浮上したスラッジの粘着性を指触にて実施例4と同じ指標で評価した。結果を表2に示す。
処理剤Bの量をゼロに変えた以外は実施例5と同じ方法で噴霧を行った。
噴霧停止後に循環水のpHおよび荷電を測定した。また、ピットに溜まっている循環水の液面に浮上したスラッジの粘着性を指触にて実施例4と同じ指標で評価した。結果を表2に示す。
F:排気ファン
P:循環水ポンプ
4:水幕板
5:水槽
6:処理剤供給部
Claims (7)
- タンニンと、
アルカリ金属水酸化物および/またはアルカリ金属炭酸塩と
を含有する水溶液からなる、
湿式塗装ブース循環水処理剤。 - タンニンが、ミモザタンニンおよび/またはケブラチョタンニンである請求項1に記載の処理剤。
- 水溶液のpHが10~13である、請求項1または2に記載の処理剤。
- 水溶液におけるタンニン濃度が10~30質量%である、請求項1~3のいずれかひとつに記載の処理剤。
- 水槽から塗装ブースに供給され、未塗着塗料を捕集し、次いで前記水槽に戻される、湿式塗装ブース循環水の経路のいずれかにおいて、
請求項1~4のいずれかひとつに記載の処理剤を前記循環水に添加して、該循環水に捕集された未塗着塗料を不粘着化させることを含む、湿式塗装ブース循環水の処理方法。 - 凝結剤を前記循環水に添加することをさらに含む、請求項5に記載の湿式塗装ブース循環水の処理方法。
- 高分子凝集剤を前記循環水に添加することをさらに含む、請求項5または6に記載の湿式塗装ブース循環水の処理方法。
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