CA2045346A1 - Paint detackification and associated treatment of water-borne paints and water-borne/solvent base paint blends - Google Patents
Paint detackification and associated treatment of water-borne paints and water-borne/solvent base paint blendsInfo
- Publication number
- CA2045346A1 CA2045346A1 CA 2045346 CA2045346A CA2045346A1 CA 2045346 A1 CA2045346 A1 CA 2045346A1 CA 2045346 CA2045346 CA 2045346 CA 2045346 A CA2045346 A CA 2045346A CA 2045346 A1 CA2045346 A1 CA 2045346A1
- Authority
- CA
- Canada
- Prior art keywords
- water
- paint
- borne
- paints
- detackification
- 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 68
- 239000002904 solvent Substances 0.000 title claims abstract description 20
- 238000011282 treatment Methods 0.000 title description 15
- 239000000203 mixture Substances 0.000 title description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000007921 spray Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 229920006318 anionic polymer Polymers 0.000 claims abstract description 10
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 9
- 230000003311 flocculating effect Effects 0.000 claims abstract description 4
- 229920002125 Sokalan® Polymers 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 5
- 239000004584 polyacrylic acid Substances 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 4
- FXNDIJDIPNCZQJ-UHFFFAOYSA-N 2,4,4-trimethylpent-1-ene Chemical group CC(=C)CC(C)(C)C FXNDIJDIPNCZQJ-UHFFFAOYSA-N 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims 2
- ZXAUZSQITFJWPS-UHFFFAOYSA-J zirconium(4+);disulfate Chemical compound [Zr+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZXAUZSQITFJWPS-UHFFFAOYSA-J 0.000 claims 2
- 239000010802 sludge Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 229910006504 ZrSO4 Inorganic materials 0.000 description 2
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229920006317 cationic polymer Polymers 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 description 1
- 229920006158 high molecular weight polymer Polymers 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 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
- 238000000926 separation method 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
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
ABSTRACT
A process for facilitating the removal of oversprayed water-borne or blended water-borne/solvent based paints from the water collection system of a paint spray booth comprising adding to the water collection system an inorganic salt. Additionally, an anionic polymer may be added to improve the detackification and flocculating performance characteristics of the process.
A process for facilitating the removal of oversprayed water-borne or blended water-borne/solvent based paints from the water collection system of a paint spray booth comprising adding to the water collection system an inorganic salt. Additionally, an anionic polymer may be added to improve the detackification and flocculating performance characteristics of the process.
Description
2 ~
PAINT DETACKIFICATION AND ASSOCIATED TREATMENT
OF WATER-BORNE PAINTS AND
WATER-BORNE/SOLVENT BASE PAINT BLENDS
FIELD OF THE INVENTION
The present invention relates to paint spray booth technology and specifically to the process of treating oversprayed paint in the water collection systems of the spray booth. Problems pertaining to the use of water-borne paints and water-borne/solvent base paint blends are addressed.
BACKGROUND OF THE INVENTION
During the applying of paint onto surfaces to be painted in a paint spray booth, the airborne oversprayed paint collected by water collection systems must be rendered non-sticky/non-tacky im-mediately after incorporation into the water collection system to prevent clogging of piping, pumps, and other components of the spray booth. In addition, the detackified paint must be easily removable from the water so the water can be recycled back into the paint spray booth. Yet another important consideration is that the chemical treatment must result in paint sludge which is high in solids (low moisture) to minimize sludge volume and disposal costs.
-2- 2~
Detackification and associated treatment (i.e. separation from water, sludge dewatering) of` solvent base paints has been a long-practiced art. However, environmental concerns and regulations to reduce emissions such as volatile organic compounds are leading to a dramatic increase in the use of water-borne paints, along with a corresponding decrease in solvent base paints.
The water-borne paints consist of a different chemistry than solvent base paints and consequently require different technologies for detackification and associated treatment. The primary difference is in the solvent, with water replacing most of the organic solvent typically used in solvent base paints. However, most water-borne paints still contain about 3-5% organic solvent. In addition to the difference in solvents, water-borne paints also often utilize different non~olatile components (resins, pigments, etc.) to accom modate the difference in solvents. Due to the differences between solvent base and water-borne paints, different technologies are required for detackification and assoc;ated treatments.
An additional complicating factor is that some paint users utilize water-borne paints on some paint lines and solvent base paints on other. The water collection systems treating these different paints are usually mixed, causing water-borne and solvent borne paints to be treated in a common sump. Thus, an effective detackification and sludge treatment must not only treat water-borne alone, but water-borne/solvent base blends.
2~ 3 It is an object of the present invention to treat paint spray booth water collection systems by effectively detackifying and flocculating water-borne paints and water-borne/solvent base blended paints so as to facilitate the formation of a removable sludge that is high in solids and low in volume.
DESCRIPTIO~ OF RELATED ART
The treatment of water-borne paint oversprays is typified in the patent to Brennan, U.S. 4,096,061. Taught therein is a treatment process consisting of adding to the water wash a cationic polymer flocculant in combination with an anionic polymer, such as polyacrylic acid, pclymaleic anhydride and copolymers of maleic anhydride with an olefin.
As previously mentioned, numerous paint spray booth systems will contain both water-borne and solvent based paints in their sumps. U.S. Patent 4,130,674, Roberts et al, addresses this particular problem by disclosing a treatment program wherein a long carbon chain (C8 - C10) surface active nitrogen derivative is added to either a polyvalent metal salt or a nonionic or anionic high molecular weight polymer, such as polyamines or homopolymers of acrylic acid. A further refinement in the treatment of dual paint systems may be seen in U.S. Patent 4,888,386, Huang et al. In this case, the patentees teach treating the water wash system with a combination of a melamine-formaldehyde polymer, polyvinyl alcohol and a styrene-acrylate copolymer.
2 ~ ?, l~;
DETAILED DESCRIPTION OF THE INVENTION
The present invention comprises adding to a paint spray booth wash water system an inorganic salt, such as ZrS04 and Al2(S04)3. Although these polymers are effective by themselves, treatment efficacy may be enhanced by combining these salts with anionic polymers.
Due to the particularly troublesome nature of water-borne and water-borne/solvent based paints it is often necessary to combine the inorganic salt with anionic polymers such as polyacrylic acid and maleic anhydride/diisobutylene copolymers.
As the present invention is practiced, an aqueous solution containing the inorganic salt and, when desired, solutions con-taining the anionic polymer are added independently to the paint spray booth recirculating water. The separate solutions can be admitted to the paint spray booth system at different locations including: the pump, upstream from the pumps, in the sump or at any other advantageous location.
The aqueous solutions prepared in accordance with the present invention may be either shot fed or continuously fed to the paint spray booth water system. The operable dosage rate of the inorganic salt will generally be in the range of 1.0 - 20%, based on overspray paint (BOP). In general, the dosage rate of the anionic polymer will be in the range of 0.01 - 15%, based on paint.
~ ~ ~ r EXAMPLES
A standard jar test procedure is used to determine the oper-able and proper treatment program and dosage level. The general procedure is to add 100 ml of tap water to a 120 ml jar. The desired treatment is added and the bottle is capped and shaken to mix the contents and coat the internal surfaces of the Jar with the treated water. One ml of paint is added to the jar. After 30 seconds of vigorous shaking the contents of the jar are observed.
The overall performance of the treatment program is evaluated based on three characteristics: detackification, flocculation and water clarity. The overall performance rating indicated for each treatment is a subjective composite based upon parameters established for each of these three characteristics. Water clarity and floc formation are based upon visual observations of the contents of the jar after shaking. Detackification performance is determined by inserting a wooden tongue depressor into the jar after shaking, removing it and observing the tackiness of the paint.
Overall Water Rating Detackification Flocculation Claritv Excellent Paint particles do not adhere Large floc, 100% Clear to jar or depressor surfaces. floats on surface Good Paint specks form on <1% of Medium-Large floc, Slightly exposed surfaces. >80% floats cloudy Fair Paint globules adhere to Small floc, Cloudy <10% of surfaces. Sludge may 50-80% floats be smeary, but not tacky.
Poor Paint coats depressor; paint no or small flocs, Turbid globules are slightly tacky most dispersed or smeary.
The following examples contain various types of paints as indicated. Treatment chemicals, concentrations and efficacy ratings are shown in each table correlating with the type of paint treated.
Water-borne paints were tested. Samples were acquired from PPG under the "Aquabase" line of paints.
TABLE I
Overall Performance TreatmentConcentration (%BOP) Rating 1) ZrS04 * 4% Excellent 2) ZrSO4 * 3% Excellent 3) Al2(S04)3 10% Good 4) Al2(S4)3* 3% Excellent * added after paint is present The following results were from tests conducted utilizing a water-borne/solvent based paint blend.
_ABLE II
Overall Performance Treatment Concentration ~%BOP) Ratinq 1) ZrSQ4 + maleic 10%
anhydride/diisobutylene 4-10% Fair 2~ ZrSO4 10%
+ polyacrylic acid 10% Good While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modifications of this 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.
PAINT DETACKIFICATION AND ASSOCIATED TREATMENT
OF WATER-BORNE PAINTS AND
WATER-BORNE/SOLVENT BASE PAINT BLENDS
FIELD OF THE INVENTION
The present invention relates to paint spray booth technology and specifically to the process of treating oversprayed paint in the water collection systems of the spray booth. Problems pertaining to the use of water-borne paints and water-borne/solvent base paint blends are addressed.
BACKGROUND OF THE INVENTION
During the applying of paint onto surfaces to be painted in a paint spray booth, the airborne oversprayed paint collected by water collection systems must be rendered non-sticky/non-tacky im-mediately after incorporation into the water collection system to prevent clogging of piping, pumps, and other components of the spray booth. In addition, the detackified paint must be easily removable from the water so the water can be recycled back into the paint spray booth. Yet another important consideration is that the chemical treatment must result in paint sludge which is high in solids (low moisture) to minimize sludge volume and disposal costs.
-2- 2~
Detackification and associated treatment (i.e. separation from water, sludge dewatering) of` solvent base paints has been a long-practiced art. However, environmental concerns and regulations to reduce emissions such as volatile organic compounds are leading to a dramatic increase in the use of water-borne paints, along with a corresponding decrease in solvent base paints.
The water-borne paints consist of a different chemistry than solvent base paints and consequently require different technologies for detackification and associated treatment. The primary difference is in the solvent, with water replacing most of the organic solvent typically used in solvent base paints. However, most water-borne paints still contain about 3-5% organic solvent. In addition to the difference in solvents, water-borne paints also often utilize different non~olatile components (resins, pigments, etc.) to accom modate the difference in solvents. Due to the differences between solvent base and water-borne paints, different technologies are required for detackification and assoc;ated treatments.
An additional complicating factor is that some paint users utilize water-borne paints on some paint lines and solvent base paints on other. The water collection systems treating these different paints are usually mixed, causing water-borne and solvent borne paints to be treated in a common sump. Thus, an effective detackification and sludge treatment must not only treat water-borne alone, but water-borne/solvent base blends.
2~ 3 It is an object of the present invention to treat paint spray booth water collection systems by effectively detackifying and flocculating water-borne paints and water-borne/solvent base blended paints so as to facilitate the formation of a removable sludge that is high in solids and low in volume.
DESCRIPTIO~ OF RELATED ART
The treatment of water-borne paint oversprays is typified in the patent to Brennan, U.S. 4,096,061. Taught therein is a treatment process consisting of adding to the water wash a cationic polymer flocculant in combination with an anionic polymer, such as polyacrylic acid, pclymaleic anhydride and copolymers of maleic anhydride with an olefin.
As previously mentioned, numerous paint spray booth systems will contain both water-borne and solvent based paints in their sumps. U.S. Patent 4,130,674, Roberts et al, addresses this particular problem by disclosing a treatment program wherein a long carbon chain (C8 - C10) surface active nitrogen derivative is added to either a polyvalent metal salt or a nonionic or anionic high molecular weight polymer, such as polyamines or homopolymers of acrylic acid. A further refinement in the treatment of dual paint systems may be seen in U.S. Patent 4,888,386, Huang et al. In this case, the patentees teach treating the water wash system with a combination of a melamine-formaldehyde polymer, polyvinyl alcohol and a styrene-acrylate copolymer.
2 ~ ?, l~;
DETAILED DESCRIPTION OF THE INVENTION
The present invention comprises adding to a paint spray booth wash water system an inorganic salt, such as ZrS04 and Al2(S04)3. Although these polymers are effective by themselves, treatment efficacy may be enhanced by combining these salts with anionic polymers.
Due to the particularly troublesome nature of water-borne and water-borne/solvent based paints it is often necessary to combine the inorganic salt with anionic polymers such as polyacrylic acid and maleic anhydride/diisobutylene copolymers.
As the present invention is practiced, an aqueous solution containing the inorganic salt and, when desired, solutions con-taining the anionic polymer are added independently to the paint spray booth recirculating water. The separate solutions can be admitted to the paint spray booth system at different locations including: the pump, upstream from the pumps, in the sump or at any other advantageous location.
The aqueous solutions prepared in accordance with the present invention may be either shot fed or continuously fed to the paint spray booth water system. The operable dosage rate of the inorganic salt will generally be in the range of 1.0 - 20%, based on overspray paint (BOP). In general, the dosage rate of the anionic polymer will be in the range of 0.01 - 15%, based on paint.
~ ~ ~ r EXAMPLES
A standard jar test procedure is used to determine the oper-able and proper treatment program and dosage level. The general procedure is to add 100 ml of tap water to a 120 ml jar. The desired treatment is added and the bottle is capped and shaken to mix the contents and coat the internal surfaces of the Jar with the treated water. One ml of paint is added to the jar. After 30 seconds of vigorous shaking the contents of the jar are observed.
The overall performance of the treatment program is evaluated based on three characteristics: detackification, flocculation and water clarity. The overall performance rating indicated for each treatment is a subjective composite based upon parameters established for each of these three characteristics. Water clarity and floc formation are based upon visual observations of the contents of the jar after shaking. Detackification performance is determined by inserting a wooden tongue depressor into the jar after shaking, removing it and observing the tackiness of the paint.
Overall Water Rating Detackification Flocculation Claritv Excellent Paint particles do not adhere Large floc, 100% Clear to jar or depressor surfaces. floats on surface Good Paint specks form on <1% of Medium-Large floc, Slightly exposed surfaces. >80% floats cloudy Fair Paint globules adhere to Small floc, Cloudy <10% of surfaces. Sludge may 50-80% floats be smeary, but not tacky.
Poor Paint coats depressor; paint no or small flocs, Turbid globules are slightly tacky most dispersed or smeary.
The following examples contain various types of paints as indicated. Treatment chemicals, concentrations and efficacy ratings are shown in each table correlating with the type of paint treated.
Water-borne paints were tested. Samples were acquired from PPG under the "Aquabase" line of paints.
TABLE I
Overall Performance TreatmentConcentration (%BOP) Rating 1) ZrS04 * 4% Excellent 2) ZrSO4 * 3% Excellent 3) Al2(S04)3 10% Good 4) Al2(S4)3* 3% Excellent * added after paint is present The following results were from tests conducted utilizing a water-borne/solvent based paint blend.
_ABLE II
Overall Performance Treatment Concentration ~%BOP) Ratinq 1) ZrSQ4 + maleic 10%
anhydride/diisobutylene 4-10% Fair 2~ ZrSO4 10%
+ polyacrylic acid 10% Good While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modifications of this 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 (8)
- THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
l. A process for detackifying and flocculating over-sprayed water-borne paint contained in a water collection system of a paint spray booth comprising adding to said water collection system a sufficient amount for the purpose of an inorganic salt selected from the group consisting of zirconium sulfate and aluminum sulfate. - 2. The process of claim 1 wherein said sufficient amount of said inorganic salt is in the range of about 1.0 - 20%, based on paint.
- 3. The process of claim l further comprising adding about 0.01 - 15%, based on paint, of an anionic polymer.
- 4. The process of claim 3 wherein said anionic polymer is selected from the group consisting of polyacrylic acid and the copolymer of maleic anhydride/diisobutylene.
- 5. A process for detackifying and flocculating oversprayed blended water-borne/solvent based paint contained in a water collection system of a paint spray booth comprising adding to said water collection system a sufficient amount for the purpose of an inorganic salt selected from the group consisting of zirconium sulfate and aluminum sulfate.
- 6. The process of claim 5 wherein said sufficient amount of said inorganic salt is in the range of about 1.0 - 20%, based on paint.
- 7. The process of claim 5 further comprising adding about 0.01 - 15%, based on paint, of an anionic polymer.
- 8. The process of claim 5 wherein said anionic polymer is selected from the group consisting of polyacrylic acid and the copolymer of maleic anhydride/diisobutylene.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58122690A | 1990-09-12 | 1990-09-12 | |
| US07/581,226 | 1990-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2045346A1 true CA2045346A1 (en) | 1992-03-13 |
Family
ID=24324359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2045346 Abandoned CA2045346A1 (en) | 1990-09-12 | 1991-06-25 | Paint detackification and associated treatment of water-borne paints and water-borne/solvent base paint blends |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2045346A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010141981A1 (en) * | 2009-06-09 | 2010-12-16 | Duluxgroup (Australia) Pty Ltd | Paint hardener |
-
1991
- 1991-06-25 CA CA 2045346 patent/CA2045346A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010141981A1 (en) * | 2009-06-09 | 2010-12-16 | Duluxgroup (Australia) Pty Ltd | Paint hardener |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |