Hi all,

This is to justify my project proposal.. So Please let me know..

1. Are there any Viscosity index improvers (Lube additives) available in market to blend with ISO VG 10 Mineral oil?

2. If so will it be compatible with oil for long….

3. If i keep the mineral oil at constant temperature (say 80% of maximum working temperature) for a long period.. Will the property (as long as the temp. is constant viscosity remains same but i am asking about lubricity, adhesion etc..) of oil remain same or will it get change?

Thanks in advance...

Vijay.G

Hi, suggest you contact additive supplier for recommendations. Lubrizol,infinium or specific polymer supplier.
Subject of VI improvers is complex but would expect some viscosity stability at constant temperature under non shear conditions, however VI improved oil passing through hydraulic pumps and valves can impair the performance(viscosity)either permanantly or temporarily.
Over a time period in use in a hydraulic system there will be a permanant loss of viscosity.

This is to justify my project proposal.. So Please let me know..

1. Are there any Viscosity index improvers (Lube additives) available in market to blend with ISO VG 10 Mineral oil?

YES but not normally avalible outside industry

2. If so will it be compatible with oil for long….

YES


3. If i keep the mineral oil at constant temperature (say 80% of maximum working temperature) for a long period.. Will the property (as long as the temp. is constant viscosity remains same but i am asking about lubricity, adhesion etc..) of oil remain same or will it get change?

AS oxidation takes place over time Vis, adhesion and other charateristics can change.

Also I agree with Rogers post.

bruce

Actually the appilcation is, to lubricate the textile spindle. so it is not going to be subjected to very high pressure.

Even in this case also lubricant will loose the viscosity over a time period?

Question on Interest...
What are the rules of thumb for selecting the oil grade for hydraulic system?

1/If the oil is to be used as a spindle oil I do not see the need for VI improver.
Textile oils have other specialist requirements.
2/Hydraulic oil is selected, firstly for viscosity, pump manufacturers specify max/min and optimum viscosity, thus system running temperature then dictates the viscosity(also start up temperature)
Pump manufacturer will also state antiwear requiremnts by oil spec HL/HLP

Roger, you are right textile spindle oil doesn’t require special additives for it’s function, but in my case as a part of value engineering I am trying to change Existing oil container material (i.e. bolster) from steel to Polymer. Mechanically polymer works good, since it is a bad thermal conductor it is not easily allows the heat to dissipate to atmmosphere, requires higher temp gradient to dissipate the heat. So the oil temperature goes up and looses the viscosity, proportionally lubricity, so it causes noise and vibration in the system. If I use higher viscous oil this problem will be solved, but the initial power consumption due to viscous drag would be high. Therefore I am looking for an additive which can keep the viscosity same even at higher temperature with out sacrificing the initial viscosity.

Vijay

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