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Viscosity Modifiers #5130908 06/10/19 09:29 PM
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MolaKule Offline OP
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There are two main categories of Viscosity Modifiers (VMs).

Names those two categories.


This question is not open to Tribologists or Chemists.

Last edited by MolaKule; 06/10/19 09:30 PM.

"Dr. Larry Fleinhardt:
You know that it's considered unsolvable?
Charlie Eppes:
Well, certainly people who have failed to solve it might think that." From NUMB3RS
Re: Viscosity Modifiers [Re: MolaKule] #5130913 06/10/19 09:34 PM
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Like Olefin Copolymers and Hydrogenated Styrene Diene?


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: Viscosity Modifiers [Re: MolaKule] #5130915 06/10/19 09:41 PM
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VII's & PPD's?

(visc. index improvers & pour point depressants)

Re: Viscosity Modifiers [Re: MolaKule] #5130918 06/10/19 09:46 PM
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MolaKule Offline OP
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Quote
Like Olefin Copolymers and Hydrogenated Styrene Diene?

Not a question of the types of chemistry but rather the two main categories of Viscosity Modifiers.

You have named some types of Viscosity Index Improvers (VII's), in which VII's are one category, so please name the other category.

Last edited by MolaKule; 06/10/19 10:18 PM.

"Dr. Larry Fleinhardt:
You know that it's considered unsolvable?
Charlie Eppes:
Well, certainly people who have failed to solve it might think that." From NUMB3RS
Re: Viscosity Modifiers [Re: MolaKule] #5131328 06/11/19 10:52 AM
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MolaKule Offline OP
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Thanks for your responses and interest in Viscosity Modifiers.

We can think of Viscosity Modifiers as falling into two categories:

1) Thickeners,

2) Viscosity Index Improvers (VII's).


Thickeners increase the viscosity of a lubricant without necessarily increasing the Viscosity Index (VI). One of those thickeners is a high viscosity Bright stock, a thick Group I oil, used as thickeners in engine oils and gear lubes, but is less used today because of less Group I production, and because better and more stable thickeners are available.

Another thickener is Polyisobutene (PIB's). At low treat rates, high viscosity PIB's are often used as viscosity "adjusters" to low-viscosity base stocks. PIB popularity has decreased due to poor oxidative and mechanical stability. However, they are still used in two-stroke engine oils, gear oils, and hydraulic fluids.

Viscosity Index Improvers (VII's) will have a larger effect on solution (bulk) viscosity at higher temperatures than at lower temperatures, thereby increasing the Viscosity Index (VI), which is the most commercially used measure of the rate of change of viscosity with temperature.

Some of the polymer VII's include Olefin Copolymers (OCP's), Polyalkyl Methacylates (PAMA's), Hydrogented Styrene-Dienes (HSD's), and PAMA-OCP polymer Blends.




Last edited by MolaKule; 06/11/19 11:19 AM.

"Dr. Larry Fleinhardt:
You know that it's considered unsolvable?
Charlie Eppes:
Well, certainly people who have failed to solve it might think that." From NUMB3RS
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