Inhibited Antifrictional Materials

Use of pol3miers in their original composition cannot fit specific requirements imposed on the reliability of bearings, movable seals and other friction members of machines. Friction joints operating in hostile media undergo elevated 

The development of inhibited polymer materials for antifrictional purposes has been a new approach to the problem of raising performance and durability of friction joints operating in hostile environments. As experience has shown, protective inhibited lubricants are not always efficient for movable joints where the lubricant is squeezed with time from the friction zone. During long-term operation of a friction joint it is necessary that Cl be continuously supplied to the friction zone and the inhibited antifrictional plastics have proved to be most suitable for this purpose [37]. 

Various polymer binders and their blends are employed (PE, PA, CFD, polyacetal, thermoelastoplasts, and so on) for the inhibited antifrictional materials of INHAM trade mark. In addition, oil-soluble inhibitors of donator types (KP, KSK, MNI, etc.), acceptor types (MSDA, BMP, SIM, etc.) and their synergetic blends with complex effects (AKOR, NG and others) are used as their Cl. The inhibitors are impregnated into the INHAM materials in the form of a solution in PI (mineral or silicone oils) and may contain various fillers and modifiers depending on the purpose. 

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Parts of friction joints and seals are often made from inhibited structural plastics (see Chap. 4). Their main role in metal-polymer friction joints is to abate Mechano-chemical wearing of metal counterbodies. Application of inhibited antifrictional materials is considered to be a promising trend for extending the life of friction joints operating in hostile media. The structural polymers or their blends most often contain plasticizers. Cl, fillers and modifiers as additional components. The inhibited plastics are employed in plain bearings, sealing elements and other members of oil-extracting equipment and vehicles. 

PA-based inhibited antifrictional materials display similar properties and can serve as (i) a sealing material [133] containing additional dry lubricants... 

Table 4.13. Service characteristics of inhibited antifrictional materials...

Sealing of friction joints is one of the most efficient filed of the inhibited antifrictional materials use. Seals are precise and costly machine members, which are critical for safe operation of equipment. 

Another method for manufacturing inhibited antifrictional materials on a PA base uses phenol formaldehyde-silicate of copper as a powder filler and benzoldehyde as the liquid medium. The formed articles are cooled in morpholine [140]. The strength and heat resistance of the articles produced are noticeably improved. 

Compression-molding is easily handled, reliable, and employs simple equipment. Its productivity is, nevertheless, rather low while it is quite labor intensive, so this method is used comparatively seldom for manufacture of inhibited antifrictional materials. 

These antifrictional materials of INHAM grade display higher wear resistance under friction in the liquid hostile media compared to non-inhibited plastics. For comparison, the properties of an antifrictional material based on PA6 and molybdenum disulfide without a Cl in its composition are presented in Table 4.13. Its wear resistance is seen to fall short of the INHAM materials since corrosion processes are not suppressed in the friction zone of this material with the metal. 

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