PTFE, commonly known as teflon, is a kind
of solid lubrication material with the smallest friction coefficient found so
far. Due to its excellent anti-corrosion and lubrication effect, high and low
temperature resistance, acid and alkali resistance, PTFE has been widely used
in many industrial fields such as aerospace, petrochemical, mechanical and
electronic. PTFE is used in lubricating oil, which can significantly improve
the quality and application performance of oil, so it has been used in oil as
an excellent solid lubricant. Such as DuPont company zonyR f1 uroaddi tives.
Ausimont Technologies of PTFE polymis @ microized powders and American troops
now use the CLP in accordance with MIL -L-63 NATO code: 460 S-758.However,
domestic research and application reports on this kind of products are still
rare. This paper mainly introduces the development of a kind of lubricating and
protective oil containing PTFE.
1.Choice of ptfe lubricants
PTFE is a polymer of tetrafluoroethylene.
It contains a cf-based chemical repeating unit in the molecule, which has no
branches and does not form crosslinks in the whole, so its molecular profile is
smooth. This smooth molecular profile makes it not only has the characteristics
of low friction, but also can be transferred to the dual surface during the
sliding process to form a thin transfer film, which plays a protective role on
the friction interface. It is generally believed that the anti-wear and
anti-friction mechanism of ptfe particles is as follows: under a certain load
state, particles can fill in the flat and concave places, and timely fill in
the damaged parts, so that the friction surface is always in a relatively flat
state; Under a certain load state, particles fall into the structural defects
caused by the matrix material on the friction surface, and a composite layer of
particles and matrix material is formed on the friction surface to improve the
micro-hardness of the friction surface, thus giving the friction surface
certain lubrication function. Under high temperature or high pressure, the
particles react with the metal surface to form metal fluoride, thus forming a
fluoride deposition film on the friction surface, thereby reducing wear. In
addition, due to the hydrophobic effect of PTFE, it also enhances the rust
resistance of oil products.
2.Oil soluble corrosion inhibitor selection
The corrosion of metal under oil film is an
electrochemical corrosion. The experiment shows that the simple oil film is
difficult to play an effective role in protecting the metal, and the single
anti-rust agent is difficult to meet the various application requirements of
oil products, so in order to achieve satisfactory application effect, two or
more corrosion inhibitors are often used together
The basic principle of choosing corrosion
inhibitor in this paper is that it should have obvious anti-rust effect when
the amount of addition is not large, and at the same time the additive should
not affect other properties of oil film. We screened the formulas of more than
10 corrosion inhibitors commonly used in China, such as barium petroleum
sulfonate, and determined the compound corrosion inhibitor system composed of 4
additives, such as barium petroleum sulfonate, magnesium lanolin soap, sben-80
and benzotriazole. Barium petroleum sulfonate has good resistance to salt spray
and moisture and heat. Magnesium lanolin soap can not only prevent rust and
assist film formation, but also improve the stability of oil to some extent
when combined with barium petroleum sulfonate. Benzotriazole is the corrosion
inhibitor of copper, silver and other nonferrous metals, which can effectively
inhibit the discoloration of copper.Sben-80: it is not only an anti-rust agent,
but also has some dissolving and dispersing effects.
Four kinds of means and methods of
technological progress increase the scale of single series and realize the best
scale benefit. Integration optimization and system optimization; Long period
stable operation; Sophisticated large-scale equipment manufacturing, to achieve
efficient and stable operation; Optimize the allocation and recycling of
resources. New catalytic technologies; New separation technologies; Biotechnology;
New materials technology; The compound application of corrosion inhibitors in
information technology has synergistic effect.
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