CA2060078A1 - Composition and process for enhanced drainage of residual aqueous rinse on the external surfaces of plastic parts - Google Patents
Composition and process for enhanced drainage of residual aqueous rinse on the external surfaces of plastic partsInfo
- Publication number
- CA2060078A1 CA2060078A1 CA 2060078 CA2060078A CA2060078A1 CA 2060078 A1 CA2060078 A1 CA 2060078A1 CA 2060078 CA2060078 CA 2060078 CA 2060078 A CA2060078 A CA 2060078A CA 2060078 A1 CA2060078 A1 CA 2060078A1
- Authority
- CA
- Canada
- Prior art keywords
- composition
- plastic parts
- drainage
- rinse
- chain alcohol
- 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
Abstract
ABSTRACT
A composition and a process for enhancing the drainage of residual aqueous rinse from the external surfaces of plastic parts, such as auto fascia, comprising a solution of a modified polyethoxylated straight-chain alcohol and a modified oxyethylated straight-chain alcohol.
A composition and a process for enhancing the drainage of residual aqueous rinse from the external surfaces of plastic parts, such as auto fascia, comprising a solution of a modified polyethoxylated straight-chain alcohol and a modified oxyethylated straight-chain alcohol.
Description
2~6~78 COMPOSITION AND PROCESS FOR ENHANCED DRAINAGE OF RESIDUAL
AQUEOUS RINSE ON THE EXTERNAL SURFACES OF PLASTIC PARTS
FIELD OF THE INVENTION
The present invention relates to compositions and processes for improved drainage of plastic parts. Aqueous solutions of poly-ethoxylated and ethoxylated straight chain alcohols are effective at enhancing the drainage of residual rinse water from the surfaces of plastic parts.
BACKGROUND OF THE INVENTION
Plastic is painted for both cosmetic and functional reasons.
These reasons include protection against weathering and fadin~, shielding electronic parts from electromagnetic and radio frequency interferences and achieving a smooth finish.
Most plastics are paintable with the appropriate choice of paint. However, some plastics will not accept paint (poor "wet-out"
or adhesion~ regardless of the cleanliness of their surfaces.
Examples of plastics that are paintable and used in the automotive industry include polycarbonate/polybutylene terephthalate, poly-phenylene oxide/nylon 66, polyphenylene oxide/polybutylene , 2 ~ 7 8 terephthalate, polyether-polyester copolymer/polybutylene tereph-thalate, polycarbonate (both unfilled and glass filled), polypheny-leneoxide (both unfilled and filled) and a resin/glass material.
In the automot;ve industry, the formed plastic parts (fascia) used are often painted. This is to provide a smooth, oftentimes metal-like finish. The paint covers molding and other substrate imperfections. Decorative effects such as mirror finishes, texturing and color match of differently processed parts are also achieved by painting.
Most plastics need to be cleaned before painting them.
The most common contaminants that must be removed before painting are mold release agents, shop soil, material handling soil, machining soils, fingerprints and plastic sanding dust. These contaminants are removed by chemical means such as detergents.
The process of cleaning plastic parts generally entails a wash stage, a rinse stage and a final rinse stage with deionized water. The plastic part can be either spray washed or immersed in the detergent. The most common processes are either an acidic detergent wash stage followed by multiple rinse stages, or an alka-line detergent stage, followed by a rinse stage, an acidic deter-gent wash stage, and multiple rinse stages. One process, for example, employs in stage 1 an alkaline wash, followed by a tap water rinse in stage 2. Stage 3 is an acidic wash with a tap water rinse in stage 4. Stages 5 and 6 can then be deionized water rinses.
;
"
. ,, :.
.,. :, 20~0~78 When the plastic part is to be painted the cleaning oper-ation is performed in a production line with the freshly cleaned part sequentially conveyed into the paint booth. Problems can occur however, when the freshly cleaned part is not fully dry.
This can lead to "spotting" when painted and will result in an imperfect paint jobO This will require stripping of the part and/or an additional painting procedure.
Further, when a bead of water dries on the plastic surface, ionic salts such as Cl, Ca, Mg and K will remain on the surface of the plastic. After the plastic has been painted, there will be a visual defect there. Exposure to humidity can lead to increased water sensitivity which can lead to blistering of the paint.
Adhesion problems could also possibly result.
Removing the aqueous rinse water from the surface of the plastic requires a drainage enhancing solution which will effec-tively aid in drying the plastic part to be painted. The present inventors have discovered an aqueous solution which will aid in reducing spotting on the external surface of plastic parts.
SUMMARY OF THE INVENTION
The present invention provides for compositions and processes for enhancing the drainage of residual aqueous rinse from the external surfaces of plastic parts comprising a poly-ethoxy1ated straight chain alcohol and an oxyethylated straight chain alcohol.
, , :
2~60~78 The present invention effectively reduces the amount of water on the external surfaces of plastic parts prior to their being painted. Any water left on the surface of the plastic can lead to spots or imperfections in the final paint finish. This invention is particularly effective at aiding in the drainage of an aqueous rinse from the external surfaces of virgin and rework plastic used in the automotive industry.
DESCRIPTION OF THE RELATED ART
United States Patent 4,560,493, Scharf et al., December I985, discloses a composition and method for reducing the liquid residue remaining on a metal surface consisting of octane-1-phos-phonic acid or water soluble salt thereof.
United States Patent 3,082,172, Temple et al., March 1963, discloses a polyoxyalkylene glycol mixture which is useful as a rinse additive composition in machine dishwashing. The composition comprises a conventional rinse additive formulation, organic poly-ethenoxy nonionic surface active agent, and a polyoxyalkylene glycol mixture consisting of alternating hydrophobic and hydro-philic polyoxyalkylene chains.
BASF/Wyandotte Technical Bulletin, "The Wonderful World of Pluronic Polyols'l, United States Library of Congress No. 70-150738 (1971), discloses various uses for ethylene oxide/propylene oxide block copolymers.
.
' ~ ; , ~ ' ' , :~
, 206~78 BASF Technical Bulletin, "Performance Chemicals for Rinse Aid Formulations", discloses various rinse aid components such as surfactants and hydrotropes.
United States Patent 3,563,901, Crotty, February 1941, teaches a rinse aid composition for use in mechanical dishwashers.
The composition consists of an alkali metal or ammonium salt of an alcohol sulfate and a poly(oxyalkylene) condensate surfactant possessing an active hydrogen containing organic precursor.
United States Patent 4,806,263, Leathers et al., February 198g, teaches an aqueous based, non-film forming cleaning com-position for wood, metal and plastic surfaces. The multi-com-ponent system comprises a fungicide, an algicide, a detergent, a thickener, and an oxidizing agent in an aqueous solution.
Primarily alcohol ethoxylates and ethoxylated alkyl phenols are the preferred detergents in this composition.
United States 3,625,901, Rue et al., December 1971, teaches a composition used as a rinse aid in mechanical dishwashers. The composition consists of a mixture of a condensation product of ethylene oxide with a distillate fraction of tall oil and a block condensation product of ethylene oxide with a distillate fraction of tall oil.
United States 4,624,713, Morganson et al., November 198~, teaches methods of warewashing which comprise releasing in the -, - .
` '' ,.. , ~ , 2 ~
rinse cycle a rinse aid. The solid rinse aid consists of urea, a polyethylene oxide-polypropylene oxide block copolymer, and water.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides for compositions and processes for enhancing the drainage of residual aqueous rinse from the external surfaces of plastic parts comprising a modified polyethoxylated straight-chain alcohol and a modified oxyethylated straight-chain alcohol.
The preferred materials in accordance with this invention include combinations of modified polyethoxylated and oxyethylated straight-chain alcohols. These are available from Betz Laboratories as HPC 10.
The modified polyethoxylated straight-chain alcohol and modified oxyethylated straight-chain alcohol are preferably blended together in an aqueous medium, such as deionized water, to form a concentrate. The modified polyethoxylated straight-chain alcohol can range from about 1Z.5% to about 92.6% by weight of the composition. The modified oxyethylated straight-chain alcohol can range by weight from about 1% to about 7.4% of the composition.
A preferred concentrate is 4% modified oxyethylated straight-chain alcohol, 46% deionized water and 50% modified polyethoxylated straight-chain alcohol.
' ' ' ,' : ' '' '' ' ~ ' ~ .
2 ~ 7 8 The preferred means of applying the rinse aid is by spraying or immersing the plastic piece to be processed in the rinse aid. The rinse aid may also be applied to the plastic piece by spraying the rinse aid onto the plastic piece. The rinse aid may have a concentration of about 0.01% to about 25% with a 0.01%
to about 1.0% concentration of rinse aid being preferred.
The invention will now be further described with reference to a number of specific examples which are to be regarded so1ely as illustrative, and not as restricting the scope of the invention.
Automotive grade plastic parts 3" x 4" in size, trade name Xenoy, available from General Electric, were cleaned in the following sequence:
Stage Treatment Step 1 3% Betz KleenR 132, 1 min. spray, 140F
2 Tap rinse, 45 seconds 3 2% PermatreatR 302, 30 sec. spray 135F
AQUEOUS RINSE ON THE EXTERNAL SURFACES OF PLASTIC PARTS
FIELD OF THE INVENTION
The present invention relates to compositions and processes for improved drainage of plastic parts. Aqueous solutions of poly-ethoxylated and ethoxylated straight chain alcohols are effective at enhancing the drainage of residual rinse water from the surfaces of plastic parts.
BACKGROUND OF THE INVENTION
Plastic is painted for both cosmetic and functional reasons.
These reasons include protection against weathering and fadin~, shielding electronic parts from electromagnetic and radio frequency interferences and achieving a smooth finish.
Most plastics are paintable with the appropriate choice of paint. However, some plastics will not accept paint (poor "wet-out"
or adhesion~ regardless of the cleanliness of their surfaces.
Examples of plastics that are paintable and used in the automotive industry include polycarbonate/polybutylene terephthalate, poly-phenylene oxide/nylon 66, polyphenylene oxide/polybutylene , 2 ~ 7 8 terephthalate, polyether-polyester copolymer/polybutylene tereph-thalate, polycarbonate (both unfilled and glass filled), polypheny-leneoxide (both unfilled and filled) and a resin/glass material.
In the automot;ve industry, the formed plastic parts (fascia) used are often painted. This is to provide a smooth, oftentimes metal-like finish. The paint covers molding and other substrate imperfections. Decorative effects such as mirror finishes, texturing and color match of differently processed parts are also achieved by painting.
Most plastics need to be cleaned before painting them.
The most common contaminants that must be removed before painting are mold release agents, shop soil, material handling soil, machining soils, fingerprints and plastic sanding dust. These contaminants are removed by chemical means such as detergents.
The process of cleaning plastic parts generally entails a wash stage, a rinse stage and a final rinse stage with deionized water. The plastic part can be either spray washed or immersed in the detergent. The most common processes are either an acidic detergent wash stage followed by multiple rinse stages, or an alka-line detergent stage, followed by a rinse stage, an acidic deter-gent wash stage, and multiple rinse stages. One process, for example, employs in stage 1 an alkaline wash, followed by a tap water rinse in stage 2. Stage 3 is an acidic wash with a tap water rinse in stage 4. Stages 5 and 6 can then be deionized water rinses.
;
"
. ,, :.
.,. :, 20~0~78 When the plastic part is to be painted the cleaning oper-ation is performed in a production line with the freshly cleaned part sequentially conveyed into the paint booth. Problems can occur however, when the freshly cleaned part is not fully dry.
This can lead to "spotting" when painted and will result in an imperfect paint jobO This will require stripping of the part and/or an additional painting procedure.
Further, when a bead of water dries on the plastic surface, ionic salts such as Cl, Ca, Mg and K will remain on the surface of the plastic. After the plastic has been painted, there will be a visual defect there. Exposure to humidity can lead to increased water sensitivity which can lead to blistering of the paint.
Adhesion problems could also possibly result.
Removing the aqueous rinse water from the surface of the plastic requires a drainage enhancing solution which will effec-tively aid in drying the plastic part to be painted. The present inventors have discovered an aqueous solution which will aid in reducing spotting on the external surface of plastic parts.
SUMMARY OF THE INVENTION
The present invention provides for compositions and processes for enhancing the drainage of residual aqueous rinse from the external surfaces of plastic parts comprising a poly-ethoxy1ated straight chain alcohol and an oxyethylated straight chain alcohol.
, , :
2~60~78 The present invention effectively reduces the amount of water on the external surfaces of plastic parts prior to their being painted. Any water left on the surface of the plastic can lead to spots or imperfections in the final paint finish. This invention is particularly effective at aiding in the drainage of an aqueous rinse from the external surfaces of virgin and rework plastic used in the automotive industry.
DESCRIPTION OF THE RELATED ART
United States Patent 4,560,493, Scharf et al., December I985, discloses a composition and method for reducing the liquid residue remaining on a metal surface consisting of octane-1-phos-phonic acid or water soluble salt thereof.
United States Patent 3,082,172, Temple et al., March 1963, discloses a polyoxyalkylene glycol mixture which is useful as a rinse additive composition in machine dishwashing. The composition comprises a conventional rinse additive formulation, organic poly-ethenoxy nonionic surface active agent, and a polyoxyalkylene glycol mixture consisting of alternating hydrophobic and hydro-philic polyoxyalkylene chains.
BASF/Wyandotte Technical Bulletin, "The Wonderful World of Pluronic Polyols'l, United States Library of Congress No. 70-150738 (1971), discloses various uses for ethylene oxide/propylene oxide block copolymers.
.
' ~ ; , ~ ' ' , :~
, 206~78 BASF Technical Bulletin, "Performance Chemicals for Rinse Aid Formulations", discloses various rinse aid components such as surfactants and hydrotropes.
United States Patent 3,563,901, Crotty, February 1941, teaches a rinse aid composition for use in mechanical dishwashers.
The composition consists of an alkali metal or ammonium salt of an alcohol sulfate and a poly(oxyalkylene) condensate surfactant possessing an active hydrogen containing organic precursor.
United States Patent 4,806,263, Leathers et al., February 198g, teaches an aqueous based, non-film forming cleaning com-position for wood, metal and plastic surfaces. The multi-com-ponent system comprises a fungicide, an algicide, a detergent, a thickener, and an oxidizing agent in an aqueous solution.
Primarily alcohol ethoxylates and ethoxylated alkyl phenols are the preferred detergents in this composition.
United States 3,625,901, Rue et al., December 1971, teaches a composition used as a rinse aid in mechanical dishwashers. The composition consists of a mixture of a condensation product of ethylene oxide with a distillate fraction of tall oil and a block condensation product of ethylene oxide with a distillate fraction of tall oil.
United States 4,624,713, Morganson et al., November 198~, teaches methods of warewashing which comprise releasing in the -, - .
` '' ,.. , ~ , 2 ~
rinse cycle a rinse aid. The solid rinse aid consists of urea, a polyethylene oxide-polypropylene oxide block copolymer, and water.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides for compositions and processes for enhancing the drainage of residual aqueous rinse from the external surfaces of plastic parts comprising a modified polyethoxylated straight-chain alcohol and a modified oxyethylated straight-chain alcohol.
The preferred materials in accordance with this invention include combinations of modified polyethoxylated and oxyethylated straight-chain alcohols. These are available from Betz Laboratories as HPC 10.
The modified polyethoxylated straight-chain alcohol and modified oxyethylated straight-chain alcohol are preferably blended together in an aqueous medium, such as deionized water, to form a concentrate. The modified polyethoxylated straight-chain alcohol can range from about 1Z.5% to about 92.6% by weight of the composition. The modified oxyethylated straight-chain alcohol can range by weight from about 1% to about 7.4% of the composition.
A preferred concentrate is 4% modified oxyethylated straight-chain alcohol, 46% deionized water and 50% modified polyethoxylated straight-chain alcohol.
' ' ' ,' : ' '' '' ' ~ ' ~ .
2 ~ 7 8 The preferred means of applying the rinse aid is by spraying or immersing the plastic piece to be processed in the rinse aid. The rinse aid may also be applied to the plastic piece by spraying the rinse aid onto the plastic piece. The rinse aid may have a concentration of about 0.01% to about 25% with a 0.01%
to about 1.0% concentration of rinse aid being preferred.
The invention will now be further described with reference to a number of specific examples which are to be regarded so1ely as illustrative, and not as restricting the scope of the invention.
Automotive grade plastic parts 3" x 4" in size, trade name Xenoy, available from General Electric, were cleaned in the following sequence:
Stage Treatment Step 1 3% Betz KleenR 132, 1 min. spray, 140F
2 Tap rinse, 45 seconds 3 2% PermatreatR 302, 30 sec. spray 135F
4 Tap rinse, 30 seconds Deionized water rinse, 30 seconds Betz KleenR 132 and PermatreatR 302 are trademarks of Betz Laboratories, Inc.
. . ..
.
~a~7s To evaluate the efficacy of the inventive concentrate as a rinse aid, dilute solutions of Betz HPC 10 were used in place of the deionized water rinse in Stage 5. Evaluations were based on the weight of water retained on the 3" x 4" plastic surface and visual observation of surface wetting. The surface wetting is reported as percent water break free. A 100% water break free is wet with a continuous film of water. A 0% water break free surface has beads of water on its surface. The results of this testing is reported in Table I.
TABLE I
Rinse Aid Water Weight Retained % Water Break Free Deionized water 1.0460 0 0.1% Betz HPC 10 0.2486 100 From these observations, it can be seen that the inventive treatment is effective at enhancing the drainage of rinse water from the surfaces of plastic parts. This is evidenced by the reduced weight of water retained on the plastic surface and the 100% water break free observation.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other furms and modifications will be obvious to those skilled in the art. The appended claims generally should be construed to cover all such obvious forms and modifications which are within the true spirit and scope of the present invention.
: , .
.
. . ..
.
~a~7s To evaluate the efficacy of the inventive concentrate as a rinse aid, dilute solutions of Betz HPC 10 were used in place of the deionized water rinse in Stage 5. Evaluations were based on the weight of water retained on the 3" x 4" plastic surface and visual observation of surface wetting. The surface wetting is reported as percent water break free. A 100% water break free is wet with a continuous film of water. A 0% water break free surface has beads of water on its surface. The results of this testing is reported in Table I.
TABLE I
Rinse Aid Water Weight Retained % Water Break Free Deionized water 1.0460 0 0.1% Betz HPC 10 0.2486 100 From these observations, it can be seen that the inventive treatment is effective at enhancing the drainage of rinse water from the surfaces of plastic parts. This is evidenced by the reduced weight of water retained on the plastic surface and the 100% water break free observation.
While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other furms and modifications will be obvious to those skilled in the art. The appended claims 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 (11)
1. A composition for enhancing the drainage of residual aqueous rinse from the external surfaces of plastic parts com-prising a modified polyethoxylated straight-chain alcohol and a modified oxyethylated straight-chain alcohol.
2. The composition as claimed in claim 1 wherein said modified polyethoxylated straight-chain alcohol is present at a concentration of about 12.5% to about 92.6% by weight of said composition.
3. The composition as claimed in claim 1 wherein said modified oxyethylated straight-chain alcohol is present at a concentration of about 1.0% to about 7.4% by weight of said composition.
4. The composition as claimed in claim 1 wherein said composition is dissolved in an aqueous solution.
5. A process for enhancing the drainage of residual aqueous rinse from the external surfaces of plastic parts com-prising contacting an effective amount for the purpose to said plastic parts a drainage enhancing solution of a modified poly-ethoxylated straight-chain alcohol and a modified oxyethylated straight-chain alcohol.
6. The process as claimed in claim 5 wherein said drainage enhancing solution is dissolved in an aqueous medium.
7. The process as claimed in claim 6 wherein said aqueous medium is deionized water.
8. The process as claimed in claim 5 wherein said drainage enhancing solution has a concentration of about 0.01% to about 25% when contacting said plastic parts.
9. The process as claimed in claim 5 wherein said drainage enhancing solution has a concentration of about 0.01% to about 1.0% when contacting said plastic parts.
10. The process as claimed in claim 5 wherein said plastic parts are immersed in said drainage enhancing solution.
11. The process as claimed in claim 5 wherein said drainage enhancing solution is sprayed onto said plastic parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2060078 CA2060078A1 (en) | 1992-01-27 | 1992-01-27 | Composition and process for enhanced drainage of residual aqueous rinse on the external surfaces of plastic parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2060078 CA2060078A1 (en) | 1992-01-27 | 1992-01-27 | Composition and process for enhanced drainage of residual aqueous rinse on the external surfaces of plastic parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2060078A1 true CA2060078A1 (en) | 1993-07-28 |
Family
ID=4149158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2060078 Abandoned CA2060078A1 (en) | 1992-01-27 | 1992-01-27 | Composition and process for enhanced drainage of residual aqueous rinse on the external surfaces of plastic parts |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2060078A1 (en) |
-
1992
- 1992-01-27 CA CA 2060078 patent/CA2060078A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |