WO2017170234A1 - 湿式塗装ブース循環水処理剤及び湿式塗装ブース循環水の処理方法 - Google Patents
湿式塗装ブース循環水処理剤及び湿式塗装ブース循環水の処理方法 Download PDFInfo
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- WO2017170234A1 WO2017170234A1 PCT/JP2017/012039 JP2017012039W WO2017170234A1 WO 2017170234 A1 WO2017170234 A1 WO 2017170234A1 JP 2017012039 W JP2017012039 W JP 2017012039W WO 2017170234 A1 WO2017170234 A1 WO 2017170234A1
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- circulating water
- paint booth
- wet paint
- aluminum salt
- booth circulating
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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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/30—Control equipment
- B01D21/305—Control of chemical properties of a component, e.g. control of pH
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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
- B05B14/41—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by cleaning the walls of the booth
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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
- B05B14/46—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material
- B05B14/462—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by washing the air charged with excess material and separating the excess material from the washing liquid, e.g. for recovery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/40—Construction elements specially adapted therefor, e.g. floors, walls or ceilings
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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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- 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
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
Definitions
- the present invention relates to a wet paint booth circulating water treatment agent for detackifying paint in a wet paint booth circulating water containing a solvent-based paint and a method for treating the wet paint booth circulating water.
- Spray painting is performed in the painting process of automobiles, electrical equipment, metal products, etc., and a large amount of overspray paint (excess paint) that does not adhere to the object is generated.
- the amount of generation reaches about 50% to 60% of the paint used except for electrostatic coating with high coating efficiency. Therefore, it is necessary to remove and recover excess paint from the environment of the painting process.
- a wet painting booth by washing with water is usually employed, and the washing water is circulated.
- aggregating and separating excess paint in the circulating water is performed.
- Solvent-based paints are superior to water-based paints in terms of weather resistance, chipping resistance, and the like, and are often used particularly in clear clear coatings for automobiles. Solvent-based paints are highly sticky to the particles of surplus paint taken into the circulating water, so that they tend to adhere to various facilities and cause severe stains, or agglomerate into large clumps and cause clogging.
- Patent Document 1 proposes to use a mixture of a tannin / cationic monomer copolymer and polyaluminum chloride for the treatment of wet paint booth circulating water containing a water-based paint and a solvent-based paint.
- Patent Document 2 proposes to use an inorganic flocculant and a polymer flocculent aid together for water-based paints.
- Patent Document 3 proposes a method of adding a phenolic resin and a cationic polymer such as an alkylamine / epichlorohydrin condensate to a wet coating booth circulating water at a predetermined ratio.
- anionic drugs such as phenol resins are known as non-adhesives for solvent-based paints, but these are used in combination with cationic drugs, and the amount of both drugs added is reduced. In order to control and maintain the ion balance of circulating water, complicated chemical injection control is required.
- the present invention solves the above-mentioned conventional problems, and can efficiently perform the detackification treatment of the wet paint booth circulating water containing the solvent-based paint with one agent without requiring complicated chemical injection control.
- An object is to provide a wet paint booth circulating water treatment agent and a wet paint booth circulating water treatment method.
- a highly basic aluminum salt having a basicity of 60% or more is excellent in the detackifying effect of the solvent-based paint. If this highly basic aluminum salt is used, the pH is 7 or more with an alkaline agent without using other agents in combination. It has been found that a high detackifying effect can be obtained with respect to the solvent-based paint only by preferably adjusting the pH to 7.5 or higher.
- the gist of the present invention is as follows.
- a wet paint booth circulating water treatment agent comprising the aluminum salt and the alkali agent in [1] or [2].
- the mixing ratio of the aluminum salt powder and the alkali agent powder is adjusted so that the pH when the mixture is added to the wet paint booth circulating water is 7 or more.
- Wet paint booth circulating water treatment agent characterized by.
- a method for treating wet paint booth circulating water containing solvent-based paint, wherein an aluminum salt having a basicity of 60% or more is added to the wet paint booth circulating water, and the pH of the wet paint booth circulating water is 7 or more A method for treating circulating water in a wet paint booth characterized by adjusting to
- the non-adhesive agent may be an aluminum salt having a basicity of 60% or more and an alkaline agent used as necessary, and an anionic agent and a cationic agent are used in combination as in the past. There is no need to control the dosing of the two drugs at a predetermined ratio.
- the pH during the treatment may be 7 or more, preferably 7.5 or more.
- an aluminum salt having a basicity of 60% or more, preferably basic aluminum chloride is used as an agent for making the solvent-based paint tack free.
- the basicity in the present invention is a value measured according to JIS K 1475-1996.
- Basic aluminum chloride is represented by the general formula [Al 2 (OH) n Cl 6-n ] m (0 ⁇ n ⁇ 6, m ⁇ 10), and the basicity is calculated as (n / 6) ⁇ 100 (%). can do.
- the mass ratio Al / Cl between aluminum and chlorine is preferably 1 or more, particularly preferably 1.2 or more.
- the upper limit of the mass ratio Al / Cl between aluminum and chlorine is 2 or less, preferably 1.9 or less.
- aluminum and chlorine can be measured by emission spectroscopy and ion chromatography, respectively.
- aluminum salts such as PAC with basicity of 60% or more, especially Al / Cl is 1
- the basic aluminum chloride as described above is excellent in the tack-free effect of the solvent-based paint.
- Such an aluminum salt having a basicity of 60% or more is advantageous in that it has a low Cl content relative to Al 2 O 3 and can reduce the amount of corrosion ions mixed therein.
- the Al / Cl of general PAC and low basic PAC is about 0.4 to 0.8.
- the details of the mechanism of action by which the aluminum salt having a basicity of 60% or more used in the present invention is excellent in the non-adhesive effect of the solvent-based paint are not clear, when the acidic aluminum salt precipitates and flocks due to an increase in pH, pH 7 If it is .5 or more, a large amount of flocs of Al (OH) 3 derived from a highly basic aluminum salt is generated, which is considered to be effectively acting against detackification. It is considered that the detackifying effect is different due to the difference in basicity even with the same aluminum salt due to the precipitated floc diameter.
- the average particle size of the floc precipitated is about 10 ⁇ m at pH 7.0, whereas an aluminum salt having a basicity of 60% has an average at pH 7.0. It is presumed that the adhesiveness of the solvent-based paint is more effectively reduced by generating fine flocs having a particle diameter of 2 ⁇ m.
- the aluminum salt used in the present invention is a highly basic aluminum salt having a basicity of 60% or more (hereinafter sometimes referred to as “highly basic aluminum salt”).
- basic aluminum chloride having a basicity of 60% or more (hereinafter sometimes referred to as “highly basic aluminum chloride”) can be preferably used.
- the mass ratio Al / Cl between aluminum and chlorine is preferably 1 or more, and particularly preferably 1.2 or more.
- the upper limit of the mass ratio Al / Cl between aluminum and chlorine is 2 or less, preferably 1.9 or less.
- Two or more kinds of aluminum salts having different basicities may be used in combination or in combination.
- the pH of the wet paint booth circulating water is adjusted to 7 or more, preferably 7.5 or more by using an alkali agent together with a highly basic aluminum salt as necessary. If the pH of the wet paint booth circulating water is less than 7, the tack-free effect of the solvent-based paint due to the highly basic aluminum salt may not be sufficiently obtained.
- the alkaline agent one or more of sodium hydroxide (caustic soda), potassium hydroxide, calcium hydroxide (slaked lime), and sodium carbonate can be used.
- slaked lime and sodium carbonate provided as a powder can be made into a single agent as a powder mixture with a highly basic aluminum salt powder, as described later, and is excellent in handleability.
- the amount of highly basic aluminum salt added to the wet paint booth circulating water is appropriately determined according to the concentration and tackiness of the solvent-based paint in the wet paint booth circulating water so as to obtain a sufficient tack-free effect. . If the addition amount of the high basic aluminum salt is too small, a sufficient tack-free effect cannot be obtained, and if it is too much, an effect commensurate with the addition amount cannot be obtained, which is preferable in terms of increase in chemical cost and generation of agglomerated sludge. Absent. Generally, it is preferable to add about 5 to 60 mg / L as an added amount in terms of Al 2 O 3 with respect to the circulating water in the wet coating booth. It is preferable to add so that the addition amount in terms of Al 2 O 3 is about 0.5 to 5% by weight with respect to the solid content of the solvent-based paint in the wet paint booth circulating water.
- the alkali agent is added as necessary so that the pH of the wet coating booth circulating water is 7 or more, preferably 7.2 or more, more preferably 7.5 or more.
- the pH range in the agglomeration treatment with an aluminum salt is about 6 to 7, but in the present invention, the highly basic aluminum salt is not intended for agglomeration, and the precipitated aluminum floc makes the solvent-based paint tack free. Therefore, the pH is adjusted to pH 7 or higher, preferably pH 7.2 or higher, more preferably pH 7.5 or higher.
- the upper limit of the pH is not particularly limited in terms of the non-adhesive effect, but is usually 8.5 or less from the viewpoint of drug cost and alkali resistance of the apparatus.
- the addition position of the chemical there is no particular restriction on the addition position of the chemical, and it may be added to the circulating liquid of the wet paint booth circulating water, or may be added to the circulating water tank, but from the viewpoint of adding the chemical at a high concentration to the surplus paint. It is preferable to add to the circulation line. When adding a highly basic aluminum salt and an alkali agent separately, it is preferable to add to the same chemical injection point or the adjacent chemical injection point.
- the wet coating booth circulating water treatment agent of the present invention may be a powder mixture of a highly basic aluminum salt powder and an alkali agent powder.
- the mixing ratio of the aluminum salt powder and the alkali agent powder is adjusted in advance so that the pH becomes 7 or more, preferably 7.2 or more, more preferably 7.5 or more. By doing so, it is possible to perform a tack-free treatment of the solvent-based paint with good workability with a single powder drug.
- the mixing ratio of the highly basic aluminum salt powder and the alkali agent powder in the powder mixture is appropriately determined according to the quality of the wet paint booth circulating water to be treated.
- the mixing ratio of the highly basic aluminum salt: sodium carbonate is appropriately set in the range of 1: 0.1 to 1 by weight.
- an inorganic material such as clay mineral or calcium carbonate can be blended in order to prevent moisture absorption or adhesion between powders.
- the addition of only a highly basic aluminum salt and an alkaline agent for pH adjustment enables the tack-free treatment to be performed efficiently without requiring ionic adjustment.
- the aluminum flock containing the solvent-based paint that has been made non-adhesive according to the present invention floats on the water surface of the circulating water tank, so that it is manually collected or floated, and a pump that can suck the surface of the water is used, It can be discharged out of the system using a known sludge recovery device.
- Agent 1 PAC aqueous solution (PAC “Taipack 6010” manufactured by Daimei Chemical Co., Ltd., basicity: 50.0%, Al 2 O 3 equivalent concentration: 10 wt%, Cl ion concentration: 8.2 wt%, Al / Cl mass Ratio: 0.6, specific gravity: 1.2)
- Agent 2 Highly basic aluminum chloride aqueous solution (basicity: 62.7%, Al 2 O 3 equivalent concentration: 23% by weight, Cl ion concentration: 7.6% by weight, Al / Cl mass ratio: 1.6, specific gravity : 1.3)
- Agent 3 Alkaline aqueous solution of phenolic resin (mixed solution of 20% by weight of phenolic resin “Resist Top 4324” manufactured by Gunei Chemical Co., Ltd., 10% by weight of 48% caustic soda and 70% by weight of pure water, specific gravity 1.1)
- Agent 4 Highly basic aluminum chloride powder (basicity: 62.7%, Al 2 O 3 equivalent content: 46% by weight, Cl
- Test paint As the test paint, a solvent-based automotive clear paint was used.
- Test method The test method is as follows. The test was conducted using the experimental apparatus shown in FIG. This experimental apparatus is configured to circulate the circulating water in the circulating water tank 1 at 100 L / min by the pump P and to flow down on the water curtain plate 2 on which the paint on the upper part of the circulating water tank is sprayed. . 3 is a paint spraying device, 11 is a circulation pipe, 12 is a discharge pipe for discharging the circulating water to the outside of the system, 13 is an exhaust pipe, V 1 and V 2 are valves, and F is an exhaust fan.
- the following chemicals were added to the wet paint booth circulating water at predetermined concentrations, respectively, and then adjusted to a predetermined pH with sulfuric acid or caustic soda to operate the apparatus (however, in Example 2, the pH was adjusted only by adding the chemical 4) ).
- the test paint was sprayed at 10 g / min for 2 minutes, and then the apparatus was stopped.
- the stickiness (immediately non-adhesiveness) of the sludge that floated on the water surface of the circulating water tank was examined by finger touch and evaluated according to the following criteria.
- the sludge was put in a container, and the stickiness (non-stickiness after drying) of the sludge after being left for 24 hours was similarly evaluated by finger touch.
- Comparative Example 1 No drug added Comparative Example 2: 6.3 mL of drug 1 (Al 2 O 3 equivalent concentration 15 mg / L) added Comparative Example 3: 3.4 mL of drug 3 (pure resin 15 mg / L) or 5 0.1 ml (resin content 22.5 mg / L) was added and 0.2 g of drug 5 was added together. Comparative Example 4: 6.3 mL of drug 6 (Al 2 O 3 equivalent concentration 15 mg / L) was added.
- Comparative Example 5 Addition of 7.2 mL of drug 7 (Al 2 O 3 conversion concentration 15 mg / L)
- Example 1 Addition of 2.5 mL of drug 2 (Al 2 O 3 conversion concentration 15 mg / L)
- Example 2 As drug 4, high base With a mixed aluminum chloride powder / sodium carbonate powder mixing ratio (g) of 1.63 / 0, 1.63 / 0.13, or 1.63 / 0.49 (all concentrations in terms of Al 2 O 3 of 15 mg / L) added
- Tables 1 to 7 show the results of Comparative Examples 1 to 5 and Examples 1 and 2.
- Highly basic aluminum chloride when viewed as a pure material, exhibits an excellent non-adhesive effect with an addition amount smaller than the resin (drug 3 + drug 5) of the existing technology shown in Table 3. Even when compared with non-adhesiveness immediately after pH 7.0, highly basic aluminum chloride has better non-adhesive properties than conventional ones and is not easily affected by pH.
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Abstract
Description
本発明においては、溶剤系塗料の不粘着化のための薬剤として、塩基度60%以上のアルミニウム塩、好ましくは塩基性塩化アルミニウムを用いる。本発明における塩基度は、JIS K 1475-1996に従って測定された値である。塩基性塩化アルミニウムは一般式[Al2(OH)nCl6-n]m(0<n<6,m≦10)で表され、塩基度は(n/6)×100(%)として計算することができる。そして、塩基性塩化アルミニウムを用いた場合には、アルミニウムと塩素との質量比Al/Clは1以上であることが好ましく、特に1.2以上であることが好ましい。更には、アルミニウムと塩素との質量比Al/Clの上限は2以下、好ましくは1.9以下であることが好ましい。ここでアルミニウムおよび塩素はそれぞれ発光分光分析法およびイオンクロマトグラフ法などによって測定することができる。一般的なPAC(塩基度=50%)や低塩基性のPAC(塩基度=34%)、硫酸バンドと比較して、塩基度60%以上のPAC等のアルミニウム塩、特にAl/Clが1以上である塩基性塩化アルミニウムは、溶剤系塗料の不粘着化効果に優れる。このような塩基度60%以上のアルミニウム塩は、Al2O3に対するCl含有量が少なく、腐食イオンの混入量を削減することができる点においても有利である。なお、一般的なPACや低塩基性のPACのAl/Clは0.4~0.8程度である。
同じアルミニウム塩でも塩基度の差異により不粘着化効果が異なるのは、析出するフロック径によるものと考えられる。例えば、塩基度50%のPACを用いた場合、析出するフロックの平均粒子径はpH7.0で10μm程度であるのに対して、塩基度60%のアルミニウム塩であれば、pH7.0で平均粒子径2μmの細かいフロックが生成することで、溶剤系塗料の粘着性がより効果的に低減されるものと推定される。
本発明で用いるアルミニウム塩は、塩基度60%以上の高塩基性のアルミニウム塩(以下、「高塩基性アルミニウム塩」と称す場合がある。)である。特に塩基度60%以上の塩基性塩化アルミニウム(以下「高塩基性塩化アルミニウム」と称す場合がある。)を好適に用いることができる。高塩基性塩化アルミニウムを用いた場合には、アルミニウムと塩素との質量比Al/Clは1以上であることが好ましく、特に1.2以上であることが好ましい。そして、アルミニウムと塩素との質量比Al/Clの上限は2以下、好ましくは1.9以下であることが好ましい。塩基度の異なるアルミニウム塩を2種以上併用してもよいし、混合して使用してもよい。
本発明においては、高塩基性アルミニウム塩と共に、必要に応じてアルカリ剤を併用して湿式塗装ブース循環水のpHを7以上、好ましくは7.5以上に調整する。湿式塗装ブース循環水のpHが7未満であると、高塩基性アルミニウム塩による溶剤系塗料の不粘着化効果を十分に得ることができないことがある。
これらのうち、粉末で提供される消石灰や炭酸ナトリウムは、後述の通り、高塩基性アルミニウム塩の粉末との粉末混合品として一剤化することができ、取り扱い性に優れる。
湿式塗装ブース循環水への高塩基性アルミニウム塩の添加量は、湿式塗装ブース循環水中の溶剤系塗料の濃度や粘着性に応じて、十分な不粘着化効果が得られるように適宜決定される。高塩基性アルミニウム塩の添加量が少な過ぎると十分な不粘着化効果が得られず、多過ぎても添加量に見合う効果は得られず薬剤コストや凝集汚泥発生量の増加等の面で好ましくない。一般的には、湿式塗装ブース循環水に対してAl2O3換算の添加量として5~60mg/L程度添加することが好ましい。湿式塗装ブース循環水中の溶剤系塗料固形分に対して、Al2O3換算の添加量が0.5~5重量%程度となるように添加することが好ましい。
高塩基性アルミニウム塩とアルカリ剤の添加形態としては特に制限はなく、これらは別々に添加してもよく、予め混合して一剤化して添加してもよい。
以下の実施例、及び比較例では、処理薬剤として以下のものを用いた。なお、以下において、塩基度は、JIS K 1475-1996に規定された方法で測定したものである。また、Al203換算濃度およびClイオン濃度はそれぞれ発光分光分析法およびイオンクロマトグラフ法によって測定したものである。そして、アルミニウムと塩素との質量比Al/Clは、Al203換算濃度およびClイオン濃度に基づき算出した値である。
薬剤1:PAC水溶液(大明化学社製PAC「タイパック6010」、塩基度:50.0%、Al2O3換算濃度:10重量%、Clイオン濃度:8.2重量%、Al/Cl質量比:0.6、比重:1.2)
薬剤2:高塩基性塩化アルミニウム水溶液(塩基度:62.7%、Al2O3換算濃度:23重量%、Clイオン濃度:7.6重量%、Al/Cl質量比:1.6、比重:1.3)
薬剤3:フェノール樹脂のアルカリ水溶液(群栄化学社製フェノール樹脂「レジトップ4324」20重量%と、48%苛性ソーダ10重量%と、純水70重量%の混合液、比重1.1)
薬剤4:高塩基性塩化アルミニウム粉末(塩基度:62.7%、Al2O3換算含有量:46重量%、Clイオン濃度:15.2重量%(換算濃度)、Al/Cl質量比:1.6)と炭酸ナトリウム粉末の混合品(溶解後のpHが試験条件のpHとなるように、炭酸ナトリウムの量を調整したもの)
薬剤5:アルキルアミン・エピクロルヒドリン縮合物の水溶液(アルキルアミン・エピクロルヒドリン縮合物濃度:50重量%、比重1.15)
薬剤6:PAC水溶液(東信化学社製PAC「W-PAC」、塩基度:約33.6%、Al2O3換算濃度:10重量%、Clイオン濃度:11.5重量%、Al/Cl質量比:0.5、比重:1.2)
薬剤7:硫酸アルミニウム水溶液(Al2O3換算濃度:8重量%、比重1.3)
供試塗料としては、溶剤系自動車用クリアー塗料を用いた。
試験方法は以下の通りである。
図1に示す実験装置を用いて試験を実施した。この実験装置は、循環水槽1内の循環水を100L/分でポンプPにより循環して、循環水槽上部の塗料が噴霧される水幕板2上に流下させるように構成されているものである。3は塗料噴霧装置であり、11は循環配管、12は、循環水を系外へ排出するための排出配管、13は排気配管、V1,V2はバルブ、Fは排気ファンである。
装置の停止直後に循環水槽の水面に浮上したスラッジの粘着性(直後不粘着性)を指触にて調べ、下記基準で評価した。
このスラッジを容器にとり、24時間放置後のスラッジの粘着性(乾燥後不粘着性)を同様に指触により評価した。
◎:粘着なし
○:粘着ないが、指でこねると容易に固まる
△:やや粘着あり
×:粘着大
比較例2:薬剤1を6.3mL(Al2O3換算濃度15mg/L)添加
比較例3:薬剤3を3.4mL(樹脂純分15mg/L)又は5.1ml(樹脂純分22.5mg/L)添加すると共に、薬剤5を0.2g併用添加
比較例4:薬剤6を6.3mL(Al2O3換算濃度15mg/L)添加
比較例5:薬剤7を7.2mL(Al2O3換算濃度15mg/L)添加
実施例1:薬剤2を2.5mL(Al2O3換算濃度15mg/L)添加
実施例2:薬剤4として、高塩基性塩化アルミニウム粉末/炭酸ナトリウム粉末混合比(g)を1.63/0、1.63/0.13、又は1.63/0.49としたもの(いずれもAl2O3換算濃度15mg/L)を添加
上記の試験結果から次のことが分かる。
Al2O3換算濃度及びpHをそろえた試験のなかで、塩基度の高い塩化アルミニウム塩のみが不粘着効果があり、またその中でもpHを7.0以上、より不粘着を利かせるためにはpH7.5以上にすることにより、不粘着性効果が有効に発揮される(表2,4~7)。
pH7.0での直後不粘着性で比較しても、高塩基性塩化アルミニウムは従来よりも直後不粘着性が良く、pHによる影響も受けにくい。
本出願は、2016年3月31日付で出願された日本特許出願2016-071912に基づいており、その全体が引用により援用される。
Claims (11)
- 溶剤系塗料を含む湿式塗装ブース循環水処理剤であって、塩基度60%以上のアルミニウム塩を含むことを特徴とする湿式塗装ブース循環水処理剤。
- 請求項1において、前記アルミニウム塩が塩基性塩化アルミニウムであって、アルミニウムと塩素との質量比Al/Clが1.0以上であることを特徴とする湿式塗装ブース循環水処理剤。
- 請求項1又は2において、前記アルミニウム塩とアルカリ剤とを含むことを特徴とする湿式塗装ブース循環水処理剤。
- 請求項3において、前記アルミニウム塩粉末とアルカリ剤粉末との粉末混合品であることを特徴とする湿式塗装ブース循環水処理剤。
- 請求項4において、前記アルミニウム塩粉末と前記アルカリ剤粉末の混合割合が、前記混合品を前記湿式塗装ブース循環水に添加したときのpHが7以上となるように調整されていることを特徴とする湿式塗装ブース循環水処理剤。
- 請求項4又は5において、前記アルカリ剤粉末が炭酸ナトリウム粉末であることを特徴とする湿式塗装ブース循環水処理剤。
- 請求項1ないし6のいずれか1項において、前記アルミニウム塩が高塩基性塩化アルミニウムであることを特徴とする湿式塗装ブース循環水処理剤。
- 溶剤系塗料を含む湿式塗装ブース循環水の処理方法であって、塩基度60%以上のアルミニウム塩を該湿式塗装ブース循環水に添加し、該湿式塗装ブース循環水のpHを7以上に調整することを特徴とする湿式塗装ブース循環水の処理方法。
- 請求項8において、前記アルミニウム塩が塩基性塩化アルミニウムであって、アルミニウムと塩素との質量比Al/Clが1.0以上であることを特徴とする湿式塗装ブース循環水の処理方法。
- 請求項8又は9において、前記湿式塗装ブース循環水に前記アルミニウム塩とアルカリ剤とを添加することを特徴とする湿式塗装ブース循環水の処理方法。
- 請求項10において、前記アルミニウム塩の粉末とアルカリ剤の粉末との混合物を前記湿式塗装ブース循環水に添加する方法であって、該混合物添加後の該湿式塗装ブース循環水のpHが7以上となるように、該アルミニウム塩の粉末と該アルカリ剤の粉末との混合割合を調整することを特徴とする湿式塗装ブース循環水の処理方法。
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