CA2174169A1 - Process for removing waterborne and oil base paints from water - Google Patents
Process for removing waterborne and oil base paints from waterInfo
- Publication number
- CA2174169A1 CA2174169A1 CA 2174169 CA2174169A CA2174169A1 CA 2174169 A1 CA2174169 A1 CA 2174169A1 CA 2174169 CA2174169 CA 2174169 CA 2174169 A CA2174169 A CA 2174169A CA 2174169 A1 CA2174169 A1 CA 2174169A1
- Authority
- CA
- Canada
- Prior art keywords
- paint
- ppm
- spray booth
- water
- polymer
- 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.)
- Abandoned
Links
- 239000003973 paint Substances 0.000 title claims abstract description 182
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 40
- 229920000642 polymer Polymers 0.000 claims abstract description 54
- 239000007921 spray Substances 0.000 claims abstract description 54
- LVYZJEPLMYTTGH-UHFFFAOYSA-H dialuminum chloride pentahydroxide dihydrate Chemical compound [Cl-].[Al+3].[OH-].[OH-].[Al+3].[OH-].[OH-].[OH-].O.O LVYZJEPLMYTTGH-UHFFFAOYSA-H 0.000 claims abstract description 34
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000007787 solid Substances 0.000 claims abstract description 25
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000001143 conditioned effect Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 9
- 230000001112 coagulating effect Effects 0.000 claims abstract description 6
- 230000003311 flocculating effect Effects 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 239000000203 mixture Substances 0.000 claims description 36
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 15
- 239000004115 Sodium Silicate Substances 0.000 claims description 13
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 13
- 229940012017 ethylenediamine Drugs 0.000 claims description 12
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- 159000000011 group IA salts Chemical class 0.000 claims 6
- 229940093932 potassium hydroxide Drugs 0.000 claims 2
- 235000011118 potassium hydroxide Nutrition 0.000 claims 2
- 229940000425 combination drug Drugs 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 56
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 28
- 229910052708 sodium Inorganic materials 0.000 description 28
- 239000011734 sodium Substances 0.000 description 28
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 19
- 229920000877 Melamine resin Polymers 0.000 description 19
- 229920000728 polyester Polymers 0.000 description 18
- 239000002585 base Substances 0.000 description 17
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 17
- 239000012190 activator Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 11
- 241000234435 Lilium Species 0.000 description 8
- 239000002609 medium Substances 0.000 description 8
- 238000011282 treatment Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000010802 sludge Substances 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 3
- 229920006317 cationic polymer Polymers 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 239000007859 condensation product Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 3
- 229920000768 polyamine Polymers 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- CNCOEDDPFOAUMB-UHFFFAOYSA-N N-Methylolacrylamide Chemical compound OCNC(=O)C=C CNCOEDDPFOAUMB-UHFFFAOYSA-N 0.000 description 2
- YFONKFDEZLYQDH-OPQQBVKSSA-N N-[(1R,2S)-2,6-dimethyindan-1-yl]-6-[(1R)-1-fluoroethyl]-1,3,5-triazine-2,4-diamine Chemical compound C[C@@H](F)C1=NC(N)=NC(N[C@H]2C3=CC(C)=CC=C3C[C@@H]2C)=N1 YFONKFDEZLYQDH-OPQQBVKSSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- -1 alkali metal zincate Chemical class 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- PLMCTRXWPXUOBK-UHFFFAOYSA-N 1,2-dichloroethane;hexane-1,6-diamine Chemical compound ClCCCl.NCCCCCCN PLMCTRXWPXUOBK-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 241001072332 Monia Species 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 101100269495 Rattus norvegicus Ina gene Proteins 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 229920006322 acrylamide copolymer Polymers 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 150000001449 anionic compounds Chemical class 0.000 description 1
- 229920006318 anionic polymer Polymers 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 229910001412 inorganic anion Inorganic materials 0.000 description 1
- WGESLFUSXZBFQF-UHFFFAOYSA-N n-methyl-n-prop-2-enylprop-2-en-1-amine Chemical compound C=CCN(C)CC=C WGESLFUSXZBFQF-UHFFFAOYSA-N 0.000 description 1
- DYUWTXWIYMHBQS-UHFFFAOYSA-N n-prop-2-enylprop-2-en-1-amine Chemical compound C=CCNCC=C DYUWTXWIYMHBQS-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920000371 poly(diallyldimethylammonium chloride) polymer Polymers 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 101150004862 secG gene Proteins 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- FQDIANVAWVHZIR-OWOJBTEDSA-N trans-1,4-Dichlorobutene Chemical compound ClC\C=C\CCl FQDIANVAWVHZIR-OWOJBTEDSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A process for detackifying oil base paint and for coagulating and flocculating waterborne paint in water. In the processes a dimethylamine/
ethylenediamine/epichlorohydrin polymer, aluminum chlorohydrate and an alkaline material are added to water to detackify oil base paint and to coagulate and flocculate waterborne paint. The conditioned paint solids can then be removed from the water. The process is particularly useful for removing paint from paint spray booth water.
ethylenediamine/epichlorohydrin polymer, aluminum chlorohydrate and an alkaline material are added to water to detackify oil base paint and to coagulate and flocculate waterborne paint. The conditioned paint solids can then be removed from the water. The process is particularly useful for removing paint from paint spray booth water.
Description
- 217~169 PROCESS FOR REMOVING WATERBORNE AND
OIL BASE PAINTS FROM WATER
FIELD OF THE INVENTION
The ~r~sen~ invention relates to processes for treating paint wastes and paint oversprays in water. More particularly, the present invention re-lates to a process which employs a polymeric composition and aluminum chJorohydrate to detackify oil base paint and to coagulate and flocculate 5 waterborne paint in water.
BACKGROUND OF THE INVENTION
The spray painting of automobile bodies, truck parts, appliances 10 and other industrial goods is typically carried out in enclosed areas called paint spray booths. These booths act to contain solvent fumes and over-sprayed paint and reduce the chances of dust contamination in order to protect the paint spray booth operators and the painted articles. These booths vary in size, but are somewhat basic in their design and opera-15 tion. A typical booth consists of a work area, back section with misteliminators and a sump.
~ 7~l~9 The articles to be painted generally pass through the work area where an air flow makes oversprayed paint contact water either in the sump or in the spray from the water curtain. The air is scrubbed with the water curtain, passes through mist eliminators and is removed by an ex-5 haust fan. The water from the water curtain, containing the oversprayedpaint, is recirculated.
Even though paint transfer efficiencies have increased through im-proved application technologies, roughly one half of all paint sprayed 10 does not reach its intended article. As a result, significant concenlralions of paint buildup in the system and paint agglomeration can occur. When solventborne paints are used, the resultant mass is a sticky, tacky mater-ial which can plug mist eliminators, shower heads, and even recirculating pumps. When waterborne paints are used, they do not cause the same 15 type of clumping and tackiness problems as are c~ ~sed by solventborne paints. Instead, waterl,o~"e paints remain dispersed in the spray booth water. Failure to remove walerbor"e paints results in increasing COD
(carl,o" oxygen demand) levels, increasing suspended solids, and in-creasing levels of foam. All of these conditions decrease water quality.
20 When water quality decreases, scrubbing efficiency decreases leading to conditions of unchecked paint emissions being discharged into the at-mosphere. Such conditions may also present safety hazards to paint spray booth operators.
It is therefore desirable to treat paint spray booth water systems so as to reduce the agglG,neralion and deposition of oversprayed paint on critical paint spray booth operating parts and to facilitate removal of the entrained paint from the system.
217416~ .
Generally waterborne paints will disperse in an aqueous medium while solventborne paints agglGmerate into a tacky mass and adhere to paint spray booth operating parts. Bec~use of the difrerences in their be-havior in water the chemical treal",ent processes differs for each type of 5 paint. In order to remove waterborne paint from an aqueous medium waterborne paints have been considered as hydrophilic polymeric col-loids which must be rendered hydrophobic. The stability of the colloids in water arises from the surface charge generated from carboxylic aliphatic or aromatic hydroxyl groups on the polymer backbone. The process of 10 destabilizing such solutions is termed coagulAtion. The process whereby the destabilized particles are induced to come together make contact and form large agglo" ,eranls is termed floccul~tion. The floc formed is generally buoyant which facilitates removal of the floc containing the paint solids from the treated water. Solventborne paints are hydrophobic 15 and their treatment has involved partially dispersing the paint particles in the ~gueous medium via an anionic dispersan~. The partially hydrophilic particles can then be lrea(ed to render them non-tacky. This process is referred to as detackification. The detackified paints can then be treated with a flocculant to facilitate their removal.
Due to the differences in the l,eal",ent methods of waterborne paint and oil base paints it is often necessAry to use separate treatments to detackify oil base paint and to co~3~ te and flocculate waterborne paint. Treat",ents which are effective for both detackifying oil base paint 25 and for co~ulAting and floccul~ting waterbor"e paint are highly desirable since they provide paint spray booth operdtor~ with the ability to use a single treatment to remove captured paints from the paint spray booth water.
~1 741 6q Therefore, a need exists for treatments which effectively detackify oil base paints and which also co~gul~tR and floccul~te waterborne paints to form conditioned paint solids which can be removed from paint spray booth water. As used herein the term "conditioned paint solids" is used to 5 mean detackified oil base paint solids and/or coa3ul~ted and flocculated waterborne paint solids.
Thus, it is an object of this invention to provide a process for detackifying oil based paint and for co~gul~ting and flocculating 10 walert,Gr~ ,e paint to facilitate removal of conditioned paint solids from paint spray booth water.
PRIOR ART
Numerous paint detackification and coagulation compositions are known. Paint overspray removal has been achieved with clays, cationic polyelèctrolytes, metal salts, urea, and melamine formaldehyde resins.
For example, U.S. Patent No. 4,637,824 to Pominville discloses a paint spray booth detackifier where the pH of the washwater is adjusted be-20 tween 7 and 12 by an alkali metal silicate. Pominville requires the addi-tion of an amphoteric metal salt and a polydiallyldimethylammonium hal-ide. Mizutani et al., U.S. Patent No. 4,600,513 discloses a paint spray booth detackifier consisting of an alkali metal zincate added to the wash-water along with a cationic polyamine including polycondensates of poly-25 ethylene glycol/hexa"~ethylenediamine, ethylenediamine/ethylenedichlo-ride and a"~monia/ethylenedichloride, etc. Also included are polyethyl-ene polyamine; polycGndensates having a molecular weight of at least 1000 of epichlorohydrin and precondensates of polyalkylene polyamines and polyoxyalkylene glycol chlorides; and condensation products of ~ ~ 74 ~ -6~
hexamethylene diamine, polyethylene glycol, epichlorohydrin and 1,4-dichloro-2-butene. U.S. Patent No. 5,060,682 to Merrell discloses a process for detackifying paint cG,nprising forming stable colloid solutions consisting of weakly ele(A,opositive metals. The metals are activated by 5 various anionic or cationic polymers including condensation products of dimethylamine/epichlorohydrin or polydiallyldimethylammonium chloride or blends thereof.
U.S. Patent No. 5,073,205 to Morse discloses an improved method 1 0 for detackifying over:jprayed paint, l~c~uer or enamel entrained in paint spray booth water comprising maintaining a small amount of N-methylo-acrylamide copolymer with methyldiallylamine in the water. Also disclos-ed is the use of a polymer flocculant to promote formation of a buoyant floc to facilitate the removal of paint solids.
U.S. Patent No. 5,143,624 to Morse discloses that poly (diallyl-amine) blended with poly (N-methylolacrylamide) effectively detackifies over-spray paint in the circulating water of a wet paint spray booth. After detackification, the dispersed paint is flocculated with hydrolyzed poly-20 acrylamide and the waste paint is removed. Morse also discloses thatboth solvent-based and water-based paints can be detackified, floccu-lated and removed by the process and that alkalinity, particularly carbon-ate alkalinity, ~ssists in floating the flocculated paint particles to the sur-face of the water system treated.
217~169 U.S. Patent 4,440,647 to Puchalski discloses compositions and methods for treating water containing water based and oil based paints - using a combination of a water dispersible polyamide-epichlorohydrin resin, a water dispersible ethylene dichloride-hexamethylenediamine 5 condensation polymer, and an amphoteric metal salt.
U.S. Patent 5,250,189 to Rey discloses a method for treating circu-lating water containing waterborne paint with aluminum salts, including aluminum chlorohydrate, and a floccu'~nt to remove sludge from the 1 0 water.
U.S. Patent 5,147,557 to Purnell discloses a process for the de-tackification and co~gl ~'-tion of oversprayed waterborne-paint and mixed waterborne and oil based paint particles in the water collection system of 15 a paint spray booth comprising adding a unitary blend of an inorganic an-ion and a cationic polymer. The sodium, potassium and ammonium salts of metal alu",inate (A102-) are among the disclosed sources of inorganic anions and a cG"clensation product of dimethylamine/ethylene diamine/
epichlorohydrin is among the disclosed cationic polymers.
SUMMARY OF THE INVENTION
To achieve the foregoing objects, the present invention provides a process for detackifying oil base paint and for coagulating and flocculat-25 ing waterborne paint in paint spray booth water. The process consistsessentially of adding to the paint spray booth water dimethylamine/ethyl-enediamine/epichlorohydrin polymer, aluminum chlorohydrate and an alkaline material selected from the group consisting of sodium hydroxide, ~174~q potassium hydroxide and sodium silicate. The polymer, aluminum chloro-hydrate and alkaline material is added in an amount sufficient to detackify oil base paint and to co~gul~te and floccul~te waterborne paint solids.
The conditioned paint solids can then be removed from the paint spray 5 booth water.
When only waterborne paint is in the paint spray booth water, the addition of an alkaline material may be optional depending on the particu-lar waterborne paint solid present in the paint spray booth water.
DETAILED DESCRIPTION OF THE INVENTION
The present inventor has discovered that dimethylamine/ethylene-diamine/epichlorohydrin (DMA/EDA/EPI) polymer, aluminum chlorohy-15 drate and an alkaline material, when added to water containing oil basepaint effectively detackifies oil base paint. The inventor has also discov-ered that a DMA/EDA/EPI polymer, aluminum chlorohydrate and option-ally an alkaline material effectively co~glJ~^tes and flocculates waterborne paint, when added to water containing waterborne paint.
Detackified oil base paint and coagulated and floccul~ted water-borne paint, termed collectively "conditioned paint solids", can then be easily removed from the water by any conventional method such as by skimming or by filtration. The invention is particularly useful for removing 25 paint from paint spray booth water.
~1 74 ~ 6q The DMA/EDA/EPI polymer (also called 1,2-ethanediamine poly-mer with (chloron)etllyl)oxirane and N-methylmethanamine) is a conden-sation product of dimethylamine plus epichlorohydrin plus ethylene diamine, prepared as taught in U.S. Pat. Re 28808 to Panzer et al., the S disclosure of which is incorporated herein by reference. DMAJEDA/EPI
polymers are available commercially from Betz Laboratories, Inc.
The polymer and aluminum chlorohydrate can be added sepa-rately to paint spray booth water or mixed together with a water carrier 10 and then added to the paint spray booth water. When water is used to mix polymer and aluminum chlorohydrate, the water can make up to 30%
by weight of the mixture. An alkaline material activator selected from the group consisting of sodium hydroxide, potassium hydroxide and sodium silicate can also be added to the polymer and aluminum chlorohydrate 15 mixture or added directly to the paint spray booth water as an ionicity source.
The prefer,ed ratio range of polymer to aluminum chlorohydrate is from about O.S to 1 to about 1 to 0.5 and the most preferred ratio is about 20 1 to1.
The amount of polymer and aluminum chlorohydrate (absent carrier) effective to coagulate and to floccul-te waterborne paint is from about 50 ppm to about 500 ppm of polymer and from about 50 ppm to 25 about 500 ppm of aluminum chlorohydrate.
21 741 bq The amount of polymer and aluminum chlorohydrate (absent a carrier) effective to detackify oil base paint is from about 50 ppm to about 500 ppm of polymer and from about 50 ppm to about 500 ppm of aluminum chlorohydrate.
When an activator is utilized the amount of activator added to paint spray booth water is up to about 2000 ppm and most preferably from about 1000 ppm to about 1600 ppm.
In the preferred embodiment of the invention a water carrier is used to mix the polymer and aluminum chlorohydrate. In the most pre-ferred embodiment of the invention a 35% by weight dimethylamine/
ethylenediamine/epichlorohydrin polymer, 35% by weight aluminum chlorohydrate and 30% by weight water mixture, in an amount of from about 250 ppm to 1000 ppm, and sodium hydroxide, potassium hydroxide or sodium silicate, in an amount of up to 1600 ppm, are added to paint spray booth water to produce conditioned paint solids in the paint spray booth water. The conditioned paint solids can then be removed from the paint spray booth water by any known removal method.
In order to show the efficacy of using the invention compositions to detackify oil base paint and to co~g~ te and flocculate waterborne paint, various tests were performed. The results are presented herein for pur-poses of illustration and not limitation.
ExamPles Jar Testin~ Procedure A standard jar test procedure is used to determine the functional 5 dosage levels and proper combinations of polymeric compositions and activator required to detackify, and coagul^te and flocculate paint. The general procedure is to add 100 milliliters (ml) of tap water to a 120 ml jar. The polymeric composition, activator and optionally a flotation poly-mer are added (either premixed or fed separately), and the bottle is 10 capped and shaken to mix the contents. One milliliter of a paint (oil based or waterborne) is then added to the jar. After vigorous shaking for 30 secG, Ids a wooden tongue depressor is immersed in the solution and then removed for examination. The following guidelines are used for evaluating the detackification performance of the treatment.
Kill Ratino. Definition Paint forms large tacky globules and/or coating which adheres to the e)~osed surfaces of the jar and tongue depressor.
OIL BASE PAINTS FROM WATER
FIELD OF THE INVENTION
The ~r~sen~ invention relates to processes for treating paint wastes and paint oversprays in water. More particularly, the present invention re-lates to a process which employs a polymeric composition and aluminum chJorohydrate to detackify oil base paint and to coagulate and flocculate 5 waterborne paint in water.
BACKGROUND OF THE INVENTION
The spray painting of automobile bodies, truck parts, appliances 10 and other industrial goods is typically carried out in enclosed areas called paint spray booths. These booths act to contain solvent fumes and over-sprayed paint and reduce the chances of dust contamination in order to protect the paint spray booth operators and the painted articles. These booths vary in size, but are somewhat basic in their design and opera-15 tion. A typical booth consists of a work area, back section with misteliminators and a sump.
~ 7~l~9 The articles to be painted generally pass through the work area where an air flow makes oversprayed paint contact water either in the sump or in the spray from the water curtain. The air is scrubbed with the water curtain, passes through mist eliminators and is removed by an ex-5 haust fan. The water from the water curtain, containing the oversprayedpaint, is recirculated.
Even though paint transfer efficiencies have increased through im-proved application technologies, roughly one half of all paint sprayed 10 does not reach its intended article. As a result, significant concenlralions of paint buildup in the system and paint agglomeration can occur. When solventborne paints are used, the resultant mass is a sticky, tacky mater-ial which can plug mist eliminators, shower heads, and even recirculating pumps. When waterborne paints are used, they do not cause the same 15 type of clumping and tackiness problems as are c~ ~sed by solventborne paints. Instead, waterl,o~"e paints remain dispersed in the spray booth water. Failure to remove walerbor"e paints results in increasing COD
(carl,o" oxygen demand) levels, increasing suspended solids, and in-creasing levels of foam. All of these conditions decrease water quality.
20 When water quality decreases, scrubbing efficiency decreases leading to conditions of unchecked paint emissions being discharged into the at-mosphere. Such conditions may also present safety hazards to paint spray booth operators.
It is therefore desirable to treat paint spray booth water systems so as to reduce the agglG,neralion and deposition of oversprayed paint on critical paint spray booth operating parts and to facilitate removal of the entrained paint from the system.
217416~ .
Generally waterborne paints will disperse in an aqueous medium while solventborne paints agglGmerate into a tacky mass and adhere to paint spray booth operating parts. Bec~use of the difrerences in their be-havior in water the chemical treal",ent processes differs for each type of 5 paint. In order to remove waterborne paint from an aqueous medium waterborne paints have been considered as hydrophilic polymeric col-loids which must be rendered hydrophobic. The stability of the colloids in water arises from the surface charge generated from carboxylic aliphatic or aromatic hydroxyl groups on the polymer backbone. The process of 10 destabilizing such solutions is termed coagulAtion. The process whereby the destabilized particles are induced to come together make contact and form large agglo" ,eranls is termed floccul~tion. The floc formed is generally buoyant which facilitates removal of the floc containing the paint solids from the treated water. Solventborne paints are hydrophobic 15 and their treatment has involved partially dispersing the paint particles in the ~gueous medium via an anionic dispersan~. The partially hydrophilic particles can then be lrea(ed to render them non-tacky. This process is referred to as detackification. The detackified paints can then be treated with a flocculant to facilitate their removal.
Due to the differences in the l,eal",ent methods of waterborne paint and oil base paints it is often necessAry to use separate treatments to detackify oil base paint and to co~3~ te and flocculate waterborne paint. Treat",ents which are effective for both detackifying oil base paint 25 and for co~ulAting and floccul~ting waterbor"e paint are highly desirable since they provide paint spray booth operdtor~ with the ability to use a single treatment to remove captured paints from the paint spray booth water.
~1 741 6q Therefore, a need exists for treatments which effectively detackify oil base paints and which also co~gul~tR and floccul~te waterborne paints to form conditioned paint solids which can be removed from paint spray booth water. As used herein the term "conditioned paint solids" is used to 5 mean detackified oil base paint solids and/or coa3ul~ted and flocculated waterborne paint solids.
Thus, it is an object of this invention to provide a process for detackifying oil based paint and for co~gul~ting and flocculating 10 walert,Gr~ ,e paint to facilitate removal of conditioned paint solids from paint spray booth water.
PRIOR ART
Numerous paint detackification and coagulation compositions are known. Paint overspray removal has been achieved with clays, cationic polyelèctrolytes, metal salts, urea, and melamine formaldehyde resins.
For example, U.S. Patent No. 4,637,824 to Pominville discloses a paint spray booth detackifier where the pH of the washwater is adjusted be-20 tween 7 and 12 by an alkali metal silicate. Pominville requires the addi-tion of an amphoteric metal salt and a polydiallyldimethylammonium hal-ide. Mizutani et al., U.S. Patent No. 4,600,513 discloses a paint spray booth detackifier consisting of an alkali metal zincate added to the wash-water along with a cationic polyamine including polycondensates of poly-25 ethylene glycol/hexa"~ethylenediamine, ethylenediamine/ethylenedichlo-ride and a"~monia/ethylenedichloride, etc. Also included are polyethyl-ene polyamine; polycGndensates having a molecular weight of at least 1000 of epichlorohydrin and precondensates of polyalkylene polyamines and polyoxyalkylene glycol chlorides; and condensation products of ~ ~ 74 ~ -6~
hexamethylene diamine, polyethylene glycol, epichlorohydrin and 1,4-dichloro-2-butene. U.S. Patent No. 5,060,682 to Merrell discloses a process for detackifying paint cG,nprising forming stable colloid solutions consisting of weakly ele(A,opositive metals. The metals are activated by 5 various anionic or cationic polymers including condensation products of dimethylamine/epichlorohydrin or polydiallyldimethylammonium chloride or blends thereof.
U.S. Patent No. 5,073,205 to Morse discloses an improved method 1 0 for detackifying over:jprayed paint, l~c~uer or enamel entrained in paint spray booth water comprising maintaining a small amount of N-methylo-acrylamide copolymer with methyldiallylamine in the water. Also disclos-ed is the use of a polymer flocculant to promote formation of a buoyant floc to facilitate the removal of paint solids.
U.S. Patent No. 5,143,624 to Morse discloses that poly (diallyl-amine) blended with poly (N-methylolacrylamide) effectively detackifies over-spray paint in the circulating water of a wet paint spray booth. After detackification, the dispersed paint is flocculated with hydrolyzed poly-20 acrylamide and the waste paint is removed. Morse also discloses thatboth solvent-based and water-based paints can be detackified, floccu-lated and removed by the process and that alkalinity, particularly carbon-ate alkalinity, ~ssists in floating the flocculated paint particles to the sur-face of the water system treated.
217~169 U.S. Patent 4,440,647 to Puchalski discloses compositions and methods for treating water containing water based and oil based paints - using a combination of a water dispersible polyamide-epichlorohydrin resin, a water dispersible ethylene dichloride-hexamethylenediamine 5 condensation polymer, and an amphoteric metal salt.
U.S. Patent 5,250,189 to Rey discloses a method for treating circu-lating water containing waterborne paint with aluminum salts, including aluminum chlorohydrate, and a floccu'~nt to remove sludge from the 1 0 water.
U.S. Patent 5,147,557 to Purnell discloses a process for the de-tackification and co~gl ~'-tion of oversprayed waterborne-paint and mixed waterborne and oil based paint particles in the water collection system of 15 a paint spray booth comprising adding a unitary blend of an inorganic an-ion and a cationic polymer. The sodium, potassium and ammonium salts of metal alu",inate (A102-) are among the disclosed sources of inorganic anions and a cG"clensation product of dimethylamine/ethylene diamine/
epichlorohydrin is among the disclosed cationic polymers.
SUMMARY OF THE INVENTION
To achieve the foregoing objects, the present invention provides a process for detackifying oil base paint and for coagulating and flocculat-25 ing waterborne paint in paint spray booth water. The process consistsessentially of adding to the paint spray booth water dimethylamine/ethyl-enediamine/epichlorohydrin polymer, aluminum chlorohydrate and an alkaline material selected from the group consisting of sodium hydroxide, ~174~q potassium hydroxide and sodium silicate. The polymer, aluminum chloro-hydrate and alkaline material is added in an amount sufficient to detackify oil base paint and to co~gul~te and floccul~te waterborne paint solids.
The conditioned paint solids can then be removed from the paint spray 5 booth water.
When only waterborne paint is in the paint spray booth water, the addition of an alkaline material may be optional depending on the particu-lar waterborne paint solid present in the paint spray booth water.
DETAILED DESCRIPTION OF THE INVENTION
The present inventor has discovered that dimethylamine/ethylene-diamine/epichlorohydrin (DMA/EDA/EPI) polymer, aluminum chlorohy-15 drate and an alkaline material, when added to water containing oil basepaint effectively detackifies oil base paint. The inventor has also discov-ered that a DMA/EDA/EPI polymer, aluminum chlorohydrate and option-ally an alkaline material effectively co~glJ~^tes and flocculates waterborne paint, when added to water containing waterborne paint.
Detackified oil base paint and coagulated and floccul~ted water-borne paint, termed collectively "conditioned paint solids", can then be easily removed from the water by any conventional method such as by skimming or by filtration. The invention is particularly useful for removing 25 paint from paint spray booth water.
~1 74 ~ 6q The DMA/EDA/EPI polymer (also called 1,2-ethanediamine poly-mer with (chloron)etllyl)oxirane and N-methylmethanamine) is a conden-sation product of dimethylamine plus epichlorohydrin plus ethylene diamine, prepared as taught in U.S. Pat. Re 28808 to Panzer et al., the S disclosure of which is incorporated herein by reference. DMAJEDA/EPI
polymers are available commercially from Betz Laboratories, Inc.
The polymer and aluminum chlorohydrate can be added sepa-rately to paint spray booth water or mixed together with a water carrier 10 and then added to the paint spray booth water. When water is used to mix polymer and aluminum chlorohydrate, the water can make up to 30%
by weight of the mixture. An alkaline material activator selected from the group consisting of sodium hydroxide, potassium hydroxide and sodium silicate can also be added to the polymer and aluminum chlorohydrate 15 mixture or added directly to the paint spray booth water as an ionicity source.
The prefer,ed ratio range of polymer to aluminum chlorohydrate is from about O.S to 1 to about 1 to 0.5 and the most preferred ratio is about 20 1 to1.
The amount of polymer and aluminum chlorohydrate (absent carrier) effective to coagulate and to floccul-te waterborne paint is from about 50 ppm to about 500 ppm of polymer and from about 50 ppm to 25 about 500 ppm of aluminum chlorohydrate.
21 741 bq The amount of polymer and aluminum chlorohydrate (absent a carrier) effective to detackify oil base paint is from about 50 ppm to about 500 ppm of polymer and from about 50 ppm to about 500 ppm of aluminum chlorohydrate.
When an activator is utilized the amount of activator added to paint spray booth water is up to about 2000 ppm and most preferably from about 1000 ppm to about 1600 ppm.
In the preferred embodiment of the invention a water carrier is used to mix the polymer and aluminum chlorohydrate. In the most pre-ferred embodiment of the invention a 35% by weight dimethylamine/
ethylenediamine/epichlorohydrin polymer, 35% by weight aluminum chlorohydrate and 30% by weight water mixture, in an amount of from about 250 ppm to 1000 ppm, and sodium hydroxide, potassium hydroxide or sodium silicate, in an amount of up to 1600 ppm, are added to paint spray booth water to produce conditioned paint solids in the paint spray booth water. The conditioned paint solids can then be removed from the paint spray booth water by any known removal method.
In order to show the efficacy of using the invention compositions to detackify oil base paint and to co~g~ te and flocculate waterborne paint, various tests were performed. The results are presented herein for pur-poses of illustration and not limitation.
ExamPles Jar Testin~ Procedure A standard jar test procedure is used to determine the functional 5 dosage levels and proper combinations of polymeric compositions and activator required to detackify, and coagul^te and flocculate paint. The general procedure is to add 100 milliliters (ml) of tap water to a 120 ml jar. The polymeric composition, activator and optionally a flotation poly-mer are added (either premixed or fed separately), and the bottle is 10 capped and shaken to mix the contents. One milliliter of a paint (oil based or waterborne) is then added to the jar. After vigorous shaking for 30 secG, Ids a wooden tongue depressor is immersed in the solution and then removed for examination. The following guidelines are used for evaluating the detackification performance of the treatment.
Kill Ratino. Definition Paint forms large tacky globules and/or coating which adheres to the e)~osed surfaces of the jar and tongue depressor.
2 Paint forms agglo",er~es which are slightly tacky to touch, or upon crushing. Paint sludge coats the tongue depressor.
3 Paint forms granular flocs which adhere to less than 10% of the exposed surface area of the jar or depressor. Sludge may be smeary, but not tacky.
4 Paint forms particles, some of which appear as specks on less than 1% of the exrosed sur~ace area of the jar or depressor. Sludge is neither smeary nor tacky.
Paint forms particles which do not adhere to the exposed surfaces of the jar or depressor. The paint sludge may float, sink, or be dispersed in the water.
Where "+" indicates a rating between the number shown with the "+" and the next highest number and "-" indicates a rating between the number shown with the "-" and the next lowest number.
Water clarity was judged on a scale of 1 to 5, where "1" was poor/
10 opaque and "5" was excellenVsubslanlially clear.
Water ClaritY Deterrnination To determine a rating of water clarity a black "X" is marked on the 15 base of a standard glass 100 mL graduated cylinder. The jar test sample (including paint, treatment chemicals and sludge) is then added to the gradll~ted cylinder. The solution is added until the "X" can no longer be seen. The following scale is then used to rate the water clarity.
20 Ratina Definition Opaque - cannot view "X" at 0.1 mL - 5 mL
2 Cannot view "X" at 6 mL - 25 mL
3 Cannot view "X" at 26 mL - 50 mL
4 Cannot view "X" at 51 mL - 75 mL
Clear, colorless - can view "X" at 100 mL
~1 741 ~9 Example I
Invention Composition A, a mixture containing 35% by weight dimethylamine/ethylenediamine/epichlorohydrin (DMA/EDA/EPI) polymer, 5 35% by weight aluminum chlorohydrate and 30% by weight water was tested against comparative Composition B, a mixture containing 35% by weight, 1,6-hexanediamine polymer with 1,2-dichloroethane, 35% by weight aluminum chlorohydrate and 30% by weight water. Compositions A and B
were used to treat water containing waterborne paints, with and without 10 alkaline activators. The results are shown in Table 1.
TABLE I
Composition Activator- Floc Water Sample Paint Concentration Conce~t~tion Size ClaritY
(ppm) (ppm) 1 Laurence-David A-250 0 large 4 (acrylic) 2 Laurence-David A400 0 large 4/4+
(acrylic) 3 Laurence-David A400 KOH-1000 small 4-(acrylic) 4 Laurence-David A-750 KOH-1000 large 4-(acrylic) 5 Laurence-David A-600 sodium silicate- large 4+
(acrylic) 1000 6 Laurence-David A-750 NaOH; pH=9 large 4/4+
(acrylic) 7 Laurence-David B400 0 large 4/4+
(acrylic) 8 Dupont (acrylic/ A400 0 large 4+
polyester) 13 2174!69 . .
TABLE I (cont'd) CompositionActivator- Floc Water Sample Paint Concentration Concentration Size Clarity (ppm) (ppm) 9 Dupont (acrylic/ A-750 KOH-1000 medium 2+
polyester) Dupont (acrylic/ A-1000 KOH-1000 medium 2+
polyester) 11 Dupont (acrylicl A400 sodium silicate - none polyester) 1000 12 Dupont (acrylic/ A-750 sodium silicate - large 4+
polyester) 1000 13 Dupont (acrylic/ A-750 NaOH; pH=9 none polyester) 14 Dupont (acrylic/ B400 0 none polyester) Dupont (acrylic/ B-750 0 large 4/4+
polyester) 16 Dupont (acrylic/ B-750 KOH-1000 none polyester) 17 Dupont (acrylic/ B-750 sodium silicate - none polyester) 1000 18 Desoto (acrylic) A400 0 none 19 Desoto (acrylic) A-750 0 large 4+
20 Desoto (acrylic) A-400 KOH-1000 none 4+
21 Desoto (acrylic) A-750 KOH-1000 none 22 Desoto(acrylic) A-400 sodium silicate - none 23 Desoto (acrylic) A-750 sodium silicate - none 24 Desoto (acrylic) A-750 NaOH; pH=9 small 2 25 Desoto (acrylic) A-1000 NaOH; pH=9 large 3 26 Desoto(acrylic) B400 0 none 27 Desoto (acrylic) B-750 0 none 28 Desoto (acrylic) B-400 KOH-1000 none 21 7~1 6q TABLE I (cont'd) Composition Activator- Floc Water SamPle Paint Concenl(alion Concenlralion Size Claritv (ppm) (PPm) 29 Desoto (acrylic)B-750 KOH-1000 none 30 Desoto (acrylic)B400 sodium silicate- none 31 Desoto (acrylic)B-750 sodium silicate- none 32 General Polymer A400 0 medium 2 (acrylic) 33 General Polymer A-750 0 medium 2 (acrylic) 34 General Polymer A400 KOH-1000 none (acrylic) 35 General Polymer A-750 KOH-1000 medium 2 (acrylic) 36 General Polymer A-1000 KOH-1000 medium 4+
(acrylic) 37 General Polymer A400 sodiumsilicate- none (acrylic) 1000 38 General Polymer A-750 sodium silicate- small 2 (acrylic) 1000 39 General Polymer A400 NaOH; pH=9 none (acrylic) 40 General Polymer A-750 NaOH; pH=9 large 3 (acrylic) 41 General Polymer B400 0 none (acrylic) 42 General Polymer B-750 0 medium 4/4+
(acrylic) 43 General Polymer B400 KOH-1000 none (acrylic) 217416q TABLE I (cont'd) CompositionActivator- Floc Water SamPlePaint Concenlr~lion Conce"lralion Size ClaritY
(~Pm) (ppm) 44 General Polymer B-750 KOH-1000 none (acrylic) 45 General Polymer B400 sodium silicate- none (acrylic) 1000 46 General Polymer B-750 sodium silicate- none t (acrylic) 1000 47 Spraylat (acrylic) A400 0 none 48 Spraylat(acrylic) A-700 0 none 49 Spraylat (acrylic) A-400 KOH-1000 poor 50 Spraylat (acrylic) A-800 KOH-1000 poor 51 Spraylat (acrylic) A-1000 KOH-1000 small 2 52 Spraylat (acrylic) A400 sodium silicate - poor 53 Spraylat(acrylic) A400 sodiumsilicate- small 4+
54 Spraylat(acrylic) A400 NaOH; pH=9 poor 2 55 Spraylat (acrylic) A400 0 none 56 Spraylat (acrylic) B-750 0 none 57 Spraylat (acrylic) B-750 KOH-1000 small 4 58 Spraylat(acrylic) B-800 KOH-1000 small 4 59 Spraylat(acrylic) B400 sodiumsilicate- small 4~
Table I shows that the invention Composition A was effective for coagulating and floccul~ting waterborne paints and, depending upon the 30 paint treated, can be effective without the need for an alkaline activator.
21 741 6'1 ExamPle 11 Compositions A and B of Example I were used to treat water con-taining oil based paints. The results are shown in Table ll.
TABLE ll Composition Activator SamPle Paint Concentration Conce,)lralion Kiil (ppm) (ppm) 1 PPG (melamine- A400 KOH-1000 3+
formaldehyde) 2 PPG (melamine- A-1000 KOH-1000 4/4+
formaldehyde) 3 PPG (melamine- A-750 sodium silicate-1000 4 formaldehyde) 4 PPG (melamine- A-750 sodium silicate-1600 4+
formaldehyde) PPG (melamine- B400 KOH-1000 3+
formaldehyde) 6 PPG (melamine- B-1000 KOH-1000 4-formaldehyde) 7 PPG (melamine- B400 sodium silicate-1000 4+
formaldehyde) 8 Dupont (polyester- A400 KOH-1000 melamine) 9 Dupont (polyester- A-750 KOH-1000 4 melamine) 10 Dupont (polyester- A400 sodium silicate-1000 4-melamine) 11 Dupont (polyester- A-750 sodium silicate-1000 4 melamine) 12 Dupont (polyester- A-750 sodium silicate-1600 4+
melamine) 13 Dupont (polyester- B400 KOH-1000 melamine) 217~169 TABLE ll (cont'd) Composition Activator SamPle Paint Concer,l,alion Conce"l,ation Kill (ppm) (DPm) 14 Dupont (polyester- B-1000 KOH-1000 melamine) 15 Dupont (polyester- B-750 sodium silicate-1000 2 melamine) 16 Dupont (polyester- B-750 sodium silicate-1600 4 melamine) 17 Lily (polyester) A400 KOH-1000 2 18 Lily (polyester) A-1000 KOH-1000 2 19 Lily (polyester) A-1000 KOH-1500 4 Lily (polyester) A-750 sodium silicate-1000 21 Lily (polyester) A-750 sodium silicate-1600 4 22 Lily (polyester) B-750 KOH-1000 23 Lily (polyester) B-750 sodium silicate-1000 3 24 Lily (polyester) B-750 sodium silicate-1600 4 25 Dupont (melamine) A-400 KOH-1000 3 26 Dupont (melamine) A-750 KOH-1500 4 27 Dupont (melamine) A-1000 KOH-1500 4 28 Dupont (melamine) A400 sodium silicate-1000 3 29 Dupont (melamine) A-750 sodium silicate-1600 4 30 Dupont (melamine) B400 KOH-100 4-31 Dupont (melamine) B-750 KOH-1500 4 32 Dupont (melamine) B-750 sodium silicate-1000 4 33 Dupont (melamine) B-1000 sodium silicate-1600 4 Table ll shows that Composition A also effectively detackifies (kills) oil base paint in water.
- ~1 7 ~
Example lll A comparison of particle size between Compositions A and B of Example I was conducted. The results are shown in Table lll.
TABLE lll Population Volume Treatment Median (um) Mean (um) Neat A 1.18 2.61 10% A in water1.17 3.00 Neat B 1.69 6.93 10% B in water1.70 6.75 Table lll shows the particle size for Composition A has a smaller 15 particle size than Composition B. The smaller size of Composition A
allows for a greater amount of surface area to contact the paint solid particle and thus enhances the detackification or coagulation and flocculation process.
Paint forms particles which do not adhere to the exposed surfaces of the jar or depressor. The paint sludge may float, sink, or be dispersed in the water.
Where "+" indicates a rating between the number shown with the "+" and the next highest number and "-" indicates a rating between the number shown with the "-" and the next lowest number.
Water clarity was judged on a scale of 1 to 5, where "1" was poor/
10 opaque and "5" was excellenVsubslanlially clear.
Water ClaritY Deterrnination To determine a rating of water clarity a black "X" is marked on the 15 base of a standard glass 100 mL graduated cylinder. The jar test sample (including paint, treatment chemicals and sludge) is then added to the gradll~ted cylinder. The solution is added until the "X" can no longer be seen. The following scale is then used to rate the water clarity.
20 Ratina Definition Opaque - cannot view "X" at 0.1 mL - 5 mL
2 Cannot view "X" at 6 mL - 25 mL
3 Cannot view "X" at 26 mL - 50 mL
4 Cannot view "X" at 51 mL - 75 mL
Clear, colorless - can view "X" at 100 mL
~1 741 ~9 Example I
Invention Composition A, a mixture containing 35% by weight dimethylamine/ethylenediamine/epichlorohydrin (DMA/EDA/EPI) polymer, 5 35% by weight aluminum chlorohydrate and 30% by weight water was tested against comparative Composition B, a mixture containing 35% by weight, 1,6-hexanediamine polymer with 1,2-dichloroethane, 35% by weight aluminum chlorohydrate and 30% by weight water. Compositions A and B
were used to treat water containing waterborne paints, with and without 10 alkaline activators. The results are shown in Table 1.
TABLE I
Composition Activator- Floc Water Sample Paint Concentration Conce~t~tion Size ClaritY
(ppm) (ppm) 1 Laurence-David A-250 0 large 4 (acrylic) 2 Laurence-David A400 0 large 4/4+
(acrylic) 3 Laurence-David A400 KOH-1000 small 4-(acrylic) 4 Laurence-David A-750 KOH-1000 large 4-(acrylic) 5 Laurence-David A-600 sodium silicate- large 4+
(acrylic) 1000 6 Laurence-David A-750 NaOH; pH=9 large 4/4+
(acrylic) 7 Laurence-David B400 0 large 4/4+
(acrylic) 8 Dupont (acrylic/ A400 0 large 4+
polyester) 13 2174!69 . .
TABLE I (cont'd) CompositionActivator- Floc Water Sample Paint Concentration Concentration Size Clarity (ppm) (ppm) 9 Dupont (acrylic/ A-750 KOH-1000 medium 2+
polyester) Dupont (acrylic/ A-1000 KOH-1000 medium 2+
polyester) 11 Dupont (acrylicl A400 sodium silicate - none polyester) 1000 12 Dupont (acrylic/ A-750 sodium silicate - large 4+
polyester) 1000 13 Dupont (acrylic/ A-750 NaOH; pH=9 none polyester) 14 Dupont (acrylic/ B400 0 none polyester) Dupont (acrylic/ B-750 0 large 4/4+
polyester) 16 Dupont (acrylic/ B-750 KOH-1000 none polyester) 17 Dupont (acrylic/ B-750 sodium silicate - none polyester) 1000 18 Desoto (acrylic) A400 0 none 19 Desoto (acrylic) A-750 0 large 4+
20 Desoto (acrylic) A-400 KOH-1000 none 4+
21 Desoto (acrylic) A-750 KOH-1000 none 22 Desoto(acrylic) A-400 sodium silicate - none 23 Desoto (acrylic) A-750 sodium silicate - none 24 Desoto (acrylic) A-750 NaOH; pH=9 small 2 25 Desoto (acrylic) A-1000 NaOH; pH=9 large 3 26 Desoto(acrylic) B400 0 none 27 Desoto (acrylic) B-750 0 none 28 Desoto (acrylic) B-400 KOH-1000 none 21 7~1 6q TABLE I (cont'd) Composition Activator- Floc Water SamPle Paint Concenl(alion Concenlralion Size Claritv (ppm) (PPm) 29 Desoto (acrylic)B-750 KOH-1000 none 30 Desoto (acrylic)B400 sodium silicate- none 31 Desoto (acrylic)B-750 sodium silicate- none 32 General Polymer A400 0 medium 2 (acrylic) 33 General Polymer A-750 0 medium 2 (acrylic) 34 General Polymer A400 KOH-1000 none (acrylic) 35 General Polymer A-750 KOH-1000 medium 2 (acrylic) 36 General Polymer A-1000 KOH-1000 medium 4+
(acrylic) 37 General Polymer A400 sodiumsilicate- none (acrylic) 1000 38 General Polymer A-750 sodium silicate- small 2 (acrylic) 1000 39 General Polymer A400 NaOH; pH=9 none (acrylic) 40 General Polymer A-750 NaOH; pH=9 large 3 (acrylic) 41 General Polymer B400 0 none (acrylic) 42 General Polymer B-750 0 medium 4/4+
(acrylic) 43 General Polymer B400 KOH-1000 none (acrylic) 217416q TABLE I (cont'd) CompositionActivator- Floc Water SamPlePaint Concenlr~lion Conce"lralion Size ClaritY
(~Pm) (ppm) 44 General Polymer B-750 KOH-1000 none (acrylic) 45 General Polymer B400 sodium silicate- none (acrylic) 1000 46 General Polymer B-750 sodium silicate- none t (acrylic) 1000 47 Spraylat (acrylic) A400 0 none 48 Spraylat(acrylic) A-700 0 none 49 Spraylat (acrylic) A-400 KOH-1000 poor 50 Spraylat (acrylic) A-800 KOH-1000 poor 51 Spraylat (acrylic) A-1000 KOH-1000 small 2 52 Spraylat (acrylic) A400 sodium silicate - poor 53 Spraylat(acrylic) A400 sodiumsilicate- small 4+
54 Spraylat(acrylic) A400 NaOH; pH=9 poor 2 55 Spraylat (acrylic) A400 0 none 56 Spraylat (acrylic) B-750 0 none 57 Spraylat (acrylic) B-750 KOH-1000 small 4 58 Spraylat(acrylic) B-800 KOH-1000 small 4 59 Spraylat(acrylic) B400 sodiumsilicate- small 4~
Table I shows that the invention Composition A was effective for coagulating and floccul~ting waterborne paints and, depending upon the 30 paint treated, can be effective without the need for an alkaline activator.
21 741 6'1 ExamPle 11 Compositions A and B of Example I were used to treat water con-taining oil based paints. The results are shown in Table ll.
TABLE ll Composition Activator SamPle Paint Concentration Conce,)lralion Kiil (ppm) (ppm) 1 PPG (melamine- A400 KOH-1000 3+
formaldehyde) 2 PPG (melamine- A-1000 KOH-1000 4/4+
formaldehyde) 3 PPG (melamine- A-750 sodium silicate-1000 4 formaldehyde) 4 PPG (melamine- A-750 sodium silicate-1600 4+
formaldehyde) PPG (melamine- B400 KOH-1000 3+
formaldehyde) 6 PPG (melamine- B-1000 KOH-1000 4-formaldehyde) 7 PPG (melamine- B400 sodium silicate-1000 4+
formaldehyde) 8 Dupont (polyester- A400 KOH-1000 melamine) 9 Dupont (polyester- A-750 KOH-1000 4 melamine) 10 Dupont (polyester- A400 sodium silicate-1000 4-melamine) 11 Dupont (polyester- A-750 sodium silicate-1000 4 melamine) 12 Dupont (polyester- A-750 sodium silicate-1600 4+
melamine) 13 Dupont (polyester- B400 KOH-1000 melamine) 217~169 TABLE ll (cont'd) Composition Activator SamPle Paint Concer,l,alion Conce"l,ation Kill (ppm) (DPm) 14 Dupont (polyester- B-1000 KOH-1000 melamine) 15 Dupont (polyester- B-750 sodium silicate-1000 2 melamine) 16 Dupont (polyester- B-750 sodium silicate-1600 4 melamine) 17 Lily (polyester) A400 KOH-1000 2 18 Lily (polyester) A-1000 KOH-1000 2 19 Lily (polyester) A-1000 KOH-1500 4 Lily (polyester) A-750 sodium silicate-1000 21 Lily (polyester) A-750 sodium silicate-1600 4 22 Lily (polyester) B-750 KOH-1000 23 Lily (polyester) B-750 sodium silicate-1000 3 24 Lily (polyester) B-750 sodium silicate-1600 4 25 Dupont (melamine) A-400 KOH-1000 3 26 Dupont (melamine) A-750 KOH-1500 4 27 Dupont (melamine) A-1000 KOH-1500 4 28 Dupont (melamine) A400 sodium silicate-1000 3 29 Dupont (melamine) A-750 sodium silicate-1600 4 30 Dupont (melamine) B400 KOH-100 4-31 Dupont (melamine) B-750 KOH-1500 4 32 Dupont (melamine) B-750 sodium silicate-1000 4 33 Dupont (melamine) B-1000 sodium silicate-1600 4 Table ll shows that Composition A also effectively detackifies (kills) oil base paint in water.
- ~1 7 ~
Example lll A comparison of particle size between Compositions A and B of Example I was conducted. The results are shown in Table lll.
TABLE lll Population Volume Treatment Median (um) Mean (um) Neat A 1.18 2.61 10% A in water1.17 3.00 Neat B 1.69 6.93 10% B in water1.70 6.75 Table lll shows the particle size for Composition A has a smaller 15 particle size than Composition B. The smaller size of Composition A
allows for a greater amount of surface area to contact the paint solid particle and thus enhances the detackification or coagulation and flocculation process.
20 ExamPle IV
Composition A of Example I was used to detackify oil based paints in the presence of various activators. The results are shown in Table IV.
TABLE IV
Composition A Activator Sample PaintConcentrationConcentration Kill (PPm) (pPm) Vemco 600 0 2 Vemco 600 sodium silicate-1000 3+
3 Vemco 600 sodium silicate-1600 4/4+
4 Vemco 750 sodium silicate-1600 4+
Vemco 600 KOH-1000 3 6 Vemco 600 KOH-1500 3+
217416~
TABLE IV (cont'd) Composition A Activator SamPle PaintConcer,lralionConcenlralion Kill (ppm) (PPm) 7 Vemco 750 KOH-1500 4-8 Vemco 600 NaOH; pH=9 3 9 Vemco 750 NaOH; pH=9 3+
Mazda 600 NaOH; pH=9 2 11 Mazda 750 NaOH; pH=9 2 12 Mazda 750 sodium silicate-1000 4 13 Mazda 750 sodium silicate-1600 4+
14 Mazda 750 KOH-1000 3+
Mazda 750 KOH-1500 3+
Thus, the invention provides a process effective for detackifying oil based paint and for coagulating and flocculating waterborne paint in water so as to condition the paint solids and thereby facilitate removal of the conditioned paint solids from the water.
The inventor also believes that since the invention compositions effectively detackify oil base paint and coagulate and flocculate water-borne paint separately that mixtures of oil base paint and waterborne paint in paint spray booth water would be effectively conditioned by the invention process.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modi-fications of the invention will be obvious to those skilled in the art. The appended claims and this invention generally should be construed to cover all such obvious forms and modifications which are within the true spirit and scope of the present invention.
Composition A of Example I was used to detackify oil based paints in the presence of various activators. The results are shown in Table IV.
TABLE IV
Composition A Activator Sample PaintConcentrationConcentration Kill (PPm) (pPm) Vemco 600 0 2 Vemco 600 sodium silicate-1000 3+
3 Vemco 600 sodium silicate-1600 4/4+
4 Vemco 750 sodium silicate-1600 4+
Vemco 600 KOH-1000 3 6 Vemco 600 KOH-1500 3+
217416~
TABLE IV (cont'd) Composition A Activator SamPle PaintConcer,lralionConcenlralion Kill (ppm) (PPm) 7 Vemco 750 KOH-1500 4-8 Vemco 600 NaOH; pH=9 3 9 Vemco 750 NaOH; pH=9 3+
Mazda 600 NaOH; pH=9 2 11 Mazda 750 NaOH; pH=9 2 12 Mazda 750 sodium silicate-1000 4 13 Mazda 750 sodium silicate-1600 4+
14 Mazda 750 KOH-1000 3+
Mazda 750 KOH-1500 3+
Thus, the invention provides a process effective for detackifying oil based paint and for coagulating and flocculating waterborne paint in water so as to condition the paint solids and thereby facilitate removal of the conditioned paint solids from the water.
The inventor also believes that since the invention compositions effectively detackify oil base paint and coagulate and flocculate water-borne paint separately that mixtures of oil base paint and waterborne paint in paint spray booth water would be effectively conditioned by the invention process.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modi-fications of the invention will be obvious to those skilled in the art. The appended claims and this invention generally should be construed to cover all such obvious forms and modifications which are within the true spirit and scope of the present invention.
Claims (10)
1. A process for detackifying oil base paint and for coagulating and flocculating waterborne paint in paint spray booth water, said process consisting essentially of adding to said paint spray booth water a sufficient amount for the purpose of dimethylamine/ethylenediamine/epichlorohydrin polymer, in combination with a sufficient amount for the purpose of alumi-num chlorohydrate and in selective combination with an amount sufficient for the purpose of an alkaline salt selected from the group consisting of sodium hydroxide, potassium hydroxide, and sodium silicate to form de-tackified oil base paint solids and coagulated ted and flocculated waterborne paint solids, wherein the weight ratio of said polymer to said aluminum chlorohydrate is from about 0.5 to 1 to about 1 to 0.5.
2. A process according to claim 1 wherein said polymer is add-ed to said paint spray booth water in an amount of from about 50 ppm to about 500 ppm, said aluminum chlorohydrate is added to said paint spray booth water in an amount of from about 50 ppm to about 500 ppm and said alkaline salt is added to said paint spray booth water in an amount of up to about 2000 ppm.
3. The process of claim 1 wherein said polymer and said alu-minum chlorohydrate are added to said paint spray booth water as an aqueous mixture comprising about 35% by weight polymer, about 35% by weight aluminum chlorohydrate and about 30% by weight water.
4. A process for detackifying oil base paint in paint spray booth water, said process consisting essentially of adding to said paint spray booth water a sufficient amount for the purpose of dimethylamine/ethyl-enediamine/epichlorohydrin polymer, in combination with a sufficient amount for the purpose of aluminum chlorohydrate and in selective com-bination with an amount sufficient for the purpose of an alkaline salt selected from the group consisting of sodium hydroxide, potassium hy-droxide, and sodium silicate to form detackified paint solids, wherein the weight ratio of said polymer to said aluminum chlorohydrate is from about 0.5 to 1 to about 1 to 0.5.
5. The process of claim 4 wherein said polymer is added to said paint spray booth water in an amount of from about 50 ppm to about 500 ppm, said aluminum chlorohydrate is added to said paint spray booth water in an amount of from about 50 ppm to about 500 ppm and said alka-line salt is added to said paint spray booth in an amount of up to about 2000 ppm.
6. The process of claim 4 wherein said polymer and said alu-minum chlorohydrate are added to said paint spray booth water as an aqueous mixture comprising about 35% by weight polymer, about 35% by weight aluminum chlorohydrate and about 30% by weight water.
7. A process for coagulating and detackifying waterborne paint in paint spray booth water, said process consisting essentially of adding to said paint spray booth water a sufficient amount for the purpose of di-methylamine/ethylenediamine/epichlorohydrin polymer, in combination with a sufficient amount for the purpose of aluminum chlorohydrate and optionally adding an amount sufficient for the purpose of an alkaline salt selected from the group consisting of sodium hydroxide, potassium hy-droxide and sodium silicate to form coagulated and detackified paint solids, wherein the weight ratio of said polymer to said aluminum chloro-hydrate is from about 0.5 to 1 to about 1 to 0.5.
8. The process of claim 7 wherein said polymer is added to said paint spray booth water in an amount of from about 50 ppm to about 500 ppm, said aluminum chlorohydrate is added to said paint spray booth water in an amount of from about 50 ppm to about 500 ppm and said alka-line salt is added to said paint spray booth in an amount of up to about 2000 ppm.
9. The process of claim 7 wherein said polymer and said alu-minum chlorohydrate are added to said paint spray booth water as an aqueous mixture comprising about 35% by weight polymer about 35% by weight aluminum chlorohydrate and about 30% by weight water.
10. A process for removing paint solids from paint spray booth water containing oil base paint, waterborne paint or mixtures of oil base and waterborne paint, said process consisting essentially of:
a) adding to said paint spray booth water from about 50 ppm to about 500 ppm of dimethylamine/ethylenediamine/epichlorohydrin polymer, from about 50 ppm to about 500 ppm of aluminum chloro-hydrate and up to about 2000 ppm of an alkaline material selected from the group consisting of sodium hydroxide, potassium hydrox-ide and sodium silicate, to detackify oil base paints and to coagu-late and flocculate waterborne paints, so as to produce conditioned paint solids wherein the weight ratio of polymer to aluminum chlorohydrate is from about 0.5:1 to about 1:0.5; and b) removing the resulting conditioned paint solids from said paint spray booth water.
a) adding to said paint spray booth water from about 50 ppm to about 500 ppm of dimethylamine/ethylenediamine/epichlorohydrin polymer, from about 50 ppm to about 500 ppm of aluminum chloro-hydrate and up to about 2000 ppm of an alkaline material selected from the group consisting of sodium hydroxide, potassium hydrox-ide and sodium silicate, to detackify oil base paints and to coagu-late and flocculate waterborne paints, so as to produce conditioned paint solids wherein the weight ratio of polymer to aluminum chlorohydrate is from about 0.5:1 to about 1:0.5; and b) removing the resulting conditioned paint solids from said paint spray booth water.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56806695A | 1995-12-06 | 1995-12-06 | |
| US08/568,066 | 1995-12-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2174169A1 true CA2174169A1 (en) | 1997-06-07 |
Family
ID=24269799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2174169 Abandoned CA2174169A1 (en) | 1995-12-06 | 1996-04-15 | Process for removing waterborne and oil base paints from water |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2174169A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006056022A1 (en) * | 2004-11-26 | 2006-06-01 | Hardman Australia Pty Ltd | Water treatment process |
-
1996
- 1996-04-15 CA CA 2174169 patent/CA2174169A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006056022A1 (en) * | 2004-11-26 | 2006-06-01 | Hardman Australia Pty Ltd | Water treatment process |
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