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Engine Oil Additive Oxidation Stability
Oct 11, 2017

engine oil additive Oxidation stability

The advantages and disadvantages of polyphenyl ether oil can be summarized as follows:

Advantages: in all lubricants, 5P4E has the best thermal stability and oxidation stability; The performance of high energy radiation is the best;

Excellent chemical stability and optimal anti-acid stability;

Even in the case of mixed membrane, it has excellent lubrication performance.

Explain the mixing film. In my understanding, the so-called mixed membrane is the elastic fluid lubrication film and the boundary lubrication film. A prominent feature of polyphenylene oxide is that the traction coefficient is high. And high traction coefficient of fluid in the traction drive is very important, such as more and more common CVTF (stepless transmission oil), so, if we do not consider the cost problem, polyphenylene oxide will be CVTF ideal raw materials. Of course, there is an inseparable relationship between the traction coefficient and the compressive coefficient, and I have covered some of the pressure coefficient knowledge in the article on hydraulic oil. The knowledge of fluid mechanics is beyond the scope of this article. Interested friends can refer to relevant books.

Excellent hydrolysis stability and low volatility;

There is good intersolubility with mineral oil and additives.

Disadvantages: the degree of viscosity that can be used is very limited;

In all lubricants, it has the worst low temperature and the lowest viscosity temperature (VI is negative).

The adaptability of the coating is poor and the anti-corrosion ability is slightly worse.

It is not mutually soluble with perfluoroether oil, silicone oil and polyether oil; And, of course,

They are expensive. Polyphenyl ether has excellent thermal and oxidation stability. But low temperature fluidity and viscosity-temperature poor performance. The introduction of alkyl on the ring of polyphenyl ether can improve the low temperature fluidity and viscosity-temperature performance, but also reduce its heat and oxidation stability. The use of polyphenyl ether as a lubricant is often an occasion requiring high temperature, nuclear radiation and chemical resistance. Due to its high pour point, complex synthesis process and the inadaptability to most additives, it is not used in the field of car oil, which does not involve the use of polyphenyl ether. Aeroengine lubricants, especially high vacuum diffusion pumps, are the largest applications of polyphenyl ether, which are usually very specialized and rarely consider factors such as price and viscosity.