Aluminum-corrosion inhibitive heat transfer fluid
AssigneeUnion Carbide Corporation
InventorsPaul H. Mohr, William N. Matulewicz
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Abstract
Composition providing aluminum corrosion resistance comprising aqueous and/or alcohol solution of a polymerizable-acid graft copolymer consisting of a poly(oxyalkylene) compound grafted with an unsaturated acid, said graft copolymer having a percent graft of between about 1 and about 60 percent. Typical acids would be those selected from the group consisting of acrylic, methacrylic, crotonic and maleic acids.
Claims34
An aluminum corrosion inhibitor composition concentrate comprising;
- (a) an alcohol or mixtures of water and alcohol, and
- (b) a polymerizable-acid graft copolymer comprising an unsaturated grafting acid and having a percent acid graft of between about 1% and 60% and a base polymer consisting of a poly(oxyalkylene) compound of the formula:
- R"(OC.sub.n H.sub.2n).sub.z OR').sub.a wherein R' and R" are members selected from the group consisting of a hydrocarbon radical, a hydrogen atom or an acyl radical, a is an integer having a value of 1 to about 4, n has a value of 2 to 4 inclusive, z is an integer having a value of from 4 to 800 inclusive, said base polymer having a molecular weight of between about 200 and about 10,000,
- and wherein the amount of component (b) is between greater than about 0.05 wt. % and about 20 wt. % based on the total amount of component (a) plus component (b) in said concentrate.
An aluminum corrosion inhibitor composition comprising:
- (a) alcohol or mixtures of water and alcohol, and
- (b) a polymerizable-acid graft copolymer comprising an unsaturated grafting acid and having a percent acid graft of between about 1% and 60% and a base polymer consisting of a poly(oxyalkylene) compound of the formula:
- R"((OC.sub.n H.sub.2n).sub.z OR').sub.a wherein R' and R" are members selected from the group consisting of a hydrocarbon radical, a hydrogen atom or an acyl radical, a is an integer having a value of 1 to about 4, n has a value of 2 to 4 inclusive, z is an integer having a value of from 4 to 800 inclusive, and preferably 8 to about 500, said base polymer having a molecular weight of between about 200 and about 10,000,
- and wherein the amount of component (b) is between greater than about 0.05 wt. % and about 15 wt. % based on the total amount of component (a) plus component (b) in said composition.
A method for providing aluminum-corrosion inhibition in an aluminum component heat transfer system which comprises filling said system with a composition comprising:
- (a) alcohol or water or mixtures thereof, and
- (b) a polymerizable-acid graft copolymer comprising an unsaturated grafting acid and having a percent acid graft of between about 1% and 60% and a base polymer consisting of a poly(oxyalkylene) compound of the formula:
- R"((OC.sub.n H.sub.2n).sub.z OR').sub.a
- wherein R' and R" are members selected from the group consisting of a hydrocarbon radical, a hydrogen atom or an acyl radical, a is an integer having a value of 1 to about 4, n has a value of 2 to 4 inclusive, z is an integer having a value of from 4 to 800 inclusive, and preferably 8 to about 500, said base polymer having a molecular weight of between about 200 and about 10,000,
- and wherein the amount of component (b) is between about 0.05 wt. % and about 15 wt. % based on the total amount of component (a) plus component (b) in said composition.
Dependencies are inferred from the claim text.