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    • 8. 发明授权
    • Automotive cleaner plus inhibitor
    • 汽车清洁剂增强剂
    • US3962109A
    • 1976-06-08
    • US533356
    • 1974-12-16
    • Alfred W. OberhoferJames J. BenkoJoseph C. Drozd
    • Alfred W. OberhoferJames J. BenkoJoseph C. Drozd
    • C23G1/04C02B5/00
    • C23G1/04
    • A cleaner-inhibitor and method of incorporating same into an automotive or diesel coolant system consisting of 2-4 fluid ounces per gallon of a cleaner whose basic components are:A. an aminopolycarboxylic acidB. an .alpha. hydroxy acid such as gluconic, tartaric, or citricC. an azole copper protector such as mercaptobenzothiazole (MBT) and a monoaryl triazole such as benzotriazole or tolyltriazoleWherein the ratio of A:B:C is about 3:1:1 to 2:1:1.A, b, and C above constitute a Deposit Release Agent in the cleaner.The cleaner above is combined with an inhibitor which is a multi-component inhibiting composition of the boron-nitrite type containing an alkali metal silicate and which may include a copper inhibitor and a polymeric dispersant, which is a water-soluble carboxylic acid polymer such as styrene maleic anhydride copolymer, a polyacrylate or methacrylate copolymer or carboxymethyl cellulose.The cleaner-inhibitor is adjusted with caustic to give a pH in the range 7.5-12.6 and preferably 7.5-10.6 either by premix or directly to the coolant system.An aqueous concentrate is preferred for both the cleaner portion and the inhibitor portion. In an aqueous concentrate of the cleaner the amount of Deposit Release Agent varies from about 85-15%, with a more preferred range being an aqueous concentrate which contains from 50-15% by weight of the Deposit Release Agent. In the inhibitor portion the aqueous concentrate contains 75-85% water and the balance active ingredients.The cleaner is used in a dosage of about 4 ounces per gallon of coolant fluid and is combined with about 4 ounces per gallon of the multi-component corrosion inhibitor utilized above. In some instances under favorable conditions, the amount of the cleaner and inhibitor portions of the cleaner-inhibitor composition may each be reduced to 2 ounces per gallon of coolant.