| 摘要 |
A mixture of b -cyanoethyl trichlorosilane (0.42 mole), dimethyldichlorosilane (3 moles) and trimethylchlorosilane (0.75 mole) is cohydrolysed and condensed to produce an oily polysiloxane, useful as a foam inhibitor in hydrocarbon fuels.ALSO:A hydrocarbon fuel composition having reduced foaming properties comprises a mixture of a hydrocarbon power fuel and a cyanoalkyl-substituted polysiloxane of the formula <FORM:0964329/C4-C5/1> where R is a monovalent hydrocarbon or halogenated hydrocarbon group, m is an integer from 1 to 5, a is from 0.001 to 1, b is from 1.001 to 2, and the sum of a and b is from 2.001 to 3, the polysiloxane being present in the range of 10 to 10.000 p.p.m. by weight. The preferred compounds are those in which the cyanoalkyl groups are cyanoethyl and R is methyl; many others are listed. The silicones may be added to gasolines, jet fuels or diesel fuels, if desired with the aid of a solvent, e.g. toluene, benzene or naphtha. |
