oxidative attack of polyamide components
oxidative attack of polyamide components
(OP)
Is it possible that the removal of a lubricating oil containing antioxidant additives may give rise to the nylon components within the system suffering oxidative attack. What i'm trying to say is........do the antioxidant additives in lubricant oil also act as an antioxidant film that protects components from oxidative attack..? Also, would the free radicals contributing to oxidation be neutralised by the additive , thus reducing potential for oxidative attack of the nylon components.





RE: oxidative attack of polyamide components
The only problems of similar nature that I'm aware of are:
A QA compound in a cutting fluid did attack some Nylon bushings.
A particular synthetic oil did dissolve Nylon after an auditive was removed
If you are working with Nylon 66 you might give these folks a call. I don't have a name as all my sources have moved on.
http://www.vydyne.com/en/Services/Default.aspx
RE: oxidative attack of polyamide components
The answer to your question is essentially no. The antioxidants within the oil do not have a substantial antioxidant effect on polymer components that are suspended within the oil. Antioxidants prevent the formation of oxidation products like alkylhydroperoxides, dialkyl peroxides, alcohols, aldehydes, ketones, carboxylic acids, and esters. Most of these are acidic in nature, so once they are generated, it is possible that one or more of these chemical species attacks the nylon. The presence of the antioxidant in the oil thus would have a secondary effect on the oxidative attack of the nylon, not a primary one.
RE: oxidative attack of polyamide components
Would an oil film covering the nylon component not offer any oxidation resistance then? I have a problem of nylon components that are basically so degraded that they crumble after only 6 months in service. The same components have been used for years in an oil lubricated compressor system without effect. Now the components are being used in an oil free (water cooled compressor) and it is now we see the problem. The water used for cooling is reverse osmosis water. Is this ro water likely the accelerate oxidation without the presence of oil. (i believe the RO water has a high ORP value approx 500mV)
RE: oxidative attack of polyamide components
Could you give a little more info about the synthetic oil additive removal issue you know of?
RE: oxidative attack of polyamide components
I would contact the Ascend (Vydyne) group and hopefully they will analyse the failed part even though it may not be Vydyne. They can tell who made the Nylon.
RE: oxidative attack of polyamide components
You may be killing the nylon by it absorbing water.
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Plymouth Tube
RE: oxidative attack of polyamide components