High molecular weight polyacrylates for aluminum protection in warewash applications
A warewashing detergent composition is provided for use for in cleaning of alkaline sensitive metals such as aluminum or aluminum containing alloys. The compositions include alternatives to sodium tripolyphosphate and/or other phosphorous containing raw materials, while retaining cleaning performance and corrosion prevention. According to the invention, high molecular weight polyacrylates (polyacrylic acid homopolymers) with a molecular weight of at least about 5000 are used as corrosion inhibitors and can be included for aluminum protection in a number of different detergent compositions.
1. A detergent composition comprising:
(a) an alkaline source in an amount effective to provide a use composition having a pH of at least about 8 and obtained by diluting the detergent composition with water;
(b) a corrosion inhibitor component in an amount sufficient for reducing corrosion of aluminum or aluminum containing alloys, the corrosion inhibitor component comprising one or more polyacrylic acid homopolymers having a molecular weight of at least about 5,000 daltons, wherein said sufficient amount of corrosion inhibitor is between 10 wt. % and 30 wt. %;
(c) a fragrance and/or dye, wherein said fragrance is in an amount between about 0.01 wt. % to about 5 wt. % and wherein said dye is in an amount between about 0.001 wt. % to about 0.5 wt. %; and
(d) less than about 0.1 % by weight of phosphorous, wherein said composition does not contain polymaleic acid polymers, and wherein said composition does not include 1-hydroxy ethylidene 1-1-diphosphonic acid.
2. The detergent composition according to claim 1 further comprising:
(e) a cleaning agent comprising a detersive amount of a surfactant.
3. The detergent composition according to claim 2 , wherein the detergent composition comprises between about 0.5 wt. % and about 20 wt. % of the cleaning agent.
4. The detergent composition according to claim 1 , wherein the corrosion inhibitor component comprises one or more polyacrylic acid homopolymers having a molecular weight of greater than 10,000 daltons.
5. The detergent composition according to claim 4 , wherein the corrosion inhibitor component comprises one or more polyacrylic acid homopolymers having a molecular weight of greater than 50,000 daltons.
6. The detergent composition according to claim 5 , wherein the corrosion inhibitor component comprises one or more polyacrylic acid homopolymers having a molecular weight of 70,000 daltons or greater.
7. The detergent composition according to claim 5 , wherein the corrosion inhibitor component comprises one or more polyacrylic acid homopolymers having a molecular weight of 100,000 daltons or greater.
8. The detergent composition according to claim 1 , wherein the detergent composition comprises between about 10 wt. % and about 25 wt. % of active corrosion inhibitor component.
9. The detergent composition according to claim 2 , wherein the cleaning agent comprises at least one of an anionic surfactant, a nonionic surfactant, a cationic surfactant, or a zwitterionic surfactant.
10. The detergent composition according to claim 1 , wherein the alkaline source comprises a metal silicate.
11. The detergent composition according to claim 1 wherein the detergent comprise less than about 0.05% by weight of phosphorous.
12. The detergent composition according to claim 1 wherein the detergent contains less than about 0.01% by weight of phosphorous.
13. A method for manufacturing a detergent composition, the method comprising:
(a) providing an amount of corrosion inhibitor in a detergent composition concentrate sufficient to provide a level of corrosion inhibitor in a use composition as a result of diluting the detergent concentrate with water at a ratio of water to the detergent concentrate of at least about 20:1, wherein said corrosion inhibitor comprises one or more polyacrylic acid homopolymers having a molecular weight of at least about 5,000 daltons, wherein corrosion inhibitor is between 10 wt. % and 30 wt. % of the detergent composition, wherein said corrosion inhibitor contains less than about 0.1% by weight of phosphorous, wherein said detergent composition comprises a fragrance and/or dye, wherein said fragrance is in an amount between about 0.01 wt. % to about 5 wt. %, and wherein said dye is in an amount between about 0.001 wt. % to about 0.5 wt. %, wherein said detergent composition does not include 1-hydroxy ethylidene 1-1-diphosphonic acid, and wherein said detergent composition does not include polymaleic acid polymers.
14. A method for protecting aluminum or aluminum containing alloys from corrosion comprising:
contacting the surface of the same with the detergent composition of claim 1 .
15. The method of claim 14 , wherein the corrosion inhibitor comprises one or more polyacrylic acid homopolymers having a molecular weight of greater than 10,000 daltons.
16. The method of claim 14 , wherein the corrosion inhibitor comprises one or more polyacrylic acid homopolymers having a molecular weight of greater than 50,000 daltons.
17. The method of claim 14 , wherein the corrosion inhibitor comprises one or more polyacrylic acid homopolymers having a molecular weight of 70,000 daltons or greater.