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机油粘度为什么会发生变化?

来源:https://www.smxnykj.com/ 发布时间:日期:2022-10-26
众所周知,粘度是石油产品的重要质量指标,在油品的生产输送和使用中有非常多的应用。
As we all know, viscosity is an important quality index of petroleum products, which has a lot of applications in the production, transportation and use of oil products.
对于机油来说,粘度是判断其是否适用于某车型的重要指标,但在换机油的时候,我们会发现旧机油的粘度相对于新油会发生变化,汽油机放出来的旧机油粘度会变小,柴油机放出来的粘度一般会变大。
For engine oil, viscosity is an important indicator to judge whether it is suitable for a certain model. However, when changing the engine oil, we will find that the viscosity of the old engine oil will change with respect to the new one. The viscosity of the old engine oil from the gasoline engine will become smaller, and the viscosity of the old engine oil from the diesel engine will generally become larger.
机油粘度为什么在汽油机与柴油机中发生不同的变化呢?
Why does oil viscosity change differently in gasoline engines and diesel engines?
一般来说,汽油机的转速比柴油机的更高,所以汽油机中的机油受到的剪切作用的影响更大,导致放出的机油粘度降低;柴油机中使用的柴油含硫量大,燃烧后产生的酸性气体比汽油机更多,压缩比更大,所以柴油机中的机油受到的氧化作用的影响更大,导致放出的机油粘度大。
Generally speaking, the speed of the gasoline engine is higher than that of the diesel engine, so the oil in the gasoline engine is more affected by the shearing action, which leads to the viscosity reduction of the oil discharged; The diesel used in diesel engines has a large sulfur content, more acidic gas is generated after combustion than gasoline engines, and the compression ratio is larger. Therefore, the oil in diesel engines is more affected by oxidation, resulting in high viscosity of the oil released.
机油粘度在使用过程中主要受到两个方面的作用:
Oil viscosity is mainly affected by two aspects during use:
一是受到剪切力的剪切作用,随着使用时间的延长,组成机油的分子链会逐渐被剪断,即大分子变成小分子,从而使粘度降低。
First, due to the shearing force, the molecular chains that make up the engine oil will be gradually cut off with the extension of service time, that is, the macromolecules will become small molecules, thus reducing the viscosity.
二是氧化作用,在高温、高压、有金属和酸性物质存在的条件下与氧发生氧化、缩合等反应。
The second is oxidation, which reacts with oxygen under high temperature, high pressure and the presence of metals and acids.
机油中70%~90%为基础油,抗剪切能力及抗氧化能力强的基础油可以大大提高机油的粘度稳定性及使用寿命。
70%~90% of the engine oil is the base oil. The base oil with strong shear resistance and oxidation resistance can greatly improve the viscosity stability and service life of the engine oil.
以上就是为大家介绍的有长效柴机油的详细的介绍,希望对您有所帮助.如果您有什么疑问的话,欢迎联系我们.我们将以的态度,为您提供服务https://www.smxnykj.com/
The above is a detailed introduction of long-acting diesel engine oil, and I hope it will be helpful to you. If you have any questions, please contact us. We will provide services for you with our attitude https://www.smxnykj.com/

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