High molecular weight polyacrylates for aluminum protection in warewash applications

摘要

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.

主权项

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 greater than 10 wt. % and 30 wt. %; and (c) less than about 0.1% by weight of phosphorous, wherein said composition does not contain polymaleic acid polymers, wherein said composition does not include sodium carbonate, wherein said composition does not include an active oxygen source bleaching agent, and wherein said composition does not include 1-hydroxy ethylidene 1-1-diphosphonic acid.