润滑科技信息平台

专利摘要

A composition of an oil of lubricating viscosity, an antioxidant, an anti-nitration agent, and optionally a borated product of an epoxide or the reactive equivalent of an epoxide, provides a desirable lubricant for diesel or natural gas-fueled engines. The composition is substantially free from metals and preferably substantially free from phosphorus. The amount of the antioxidant the anti-initration agent are sufficient to reduce the amount of varnish formation in a natural gas engine. ......

基本信息

专利类型:
发明专利
申请/专利号:
US08/522804
申请日期:
1995-09-01
专利申请人:
路博润公司
分类号:
["C10M141/10","C10M141/00","C10M141/12","C10M163/00","F02B3/00","F02B3/06","C10M141/06","C10N40/25","C10M137/08"]
发明/设计人:
BARDASZ, EWA A.
权利要求: What is claimed is:1. A method for lubricating a natural gas-fueled internal combustion engine, comprising supplying to the engine a composition comprising:(a) an oil of lubricating viscosity;(b) at least about 1.8% by weight of an antioxidant; and(c) a hydrocarbylamine phosphate salt anti-nitration agent,wherein the composition is substantially free from metals, andwherein the amount of the antioxidant and the amount of the anti-nitration agent are sufficient to reduce the amount of varnish formation in a natural gas-fueled internal-combustion engine.2. The method of claim 1 wherein the amount of the antioxidant is at least about 1.8 percent by weight and the amount of the anti-nitration agent is at least about 0.01 percent by weight.3. The method of claim 1 wherein the oil of lubricating viscosity is mineral oil.4. The method of claim 1 wherein the antioxidant is at least one hindered phenol or at least one aromatic amine or a mixture thereof.5. The method of claim 4 wherein the antioxidant is a mixture of di-t-butyl-4-methylphenol and alkylated diphenylamine.6. The method of claim 1 wherein the composition further comprises(d) at least about 0.1% by weight of a borated product of an epoxide or the reactive equivalent of an epoxide.7. The method of claim 6 wherein the epoxide or reactive equivalent thereof is an epoxide of the formula ##STR16## or a diol of the formula ##STR17## wherein each R is independently hydrogen or a hydrocarbyl group containing about 8 to about 30 carbon atoms, at least one of which is hydrocarbyl.8. The method of claim 1 wherein the composition further comprises a dispersant.9. The method of claim 8 wherein the dispersant is a succinimide dispersant.10. The method of claim 8 wherein the amount of the dispersant is about 1 to about 10% by weight of the composition.11. The method of claim 1 wherein the sulfated ash of the composition is less than about 0.01%.12. The method of claim 1 wherein the composition contains less than about 0.03% phosphorus.