Croda Lubricants
Innovation You Can Build On™
By Chris Donaghy, Sales Director | TLT CMF Plus November 2015
Croda introduced two major topics during the 2015 commercial marketing forum focused on meeting customer formulating challenges.
The first topic is Priolube™ HS1000. A novel class of base oil technology which can be utilized either as a sole base oil or as a blending stock with more traditional base oils.
Priolube HS1000 can be described as a liquid amide and was designed to deliver all the features and benefits of synthetic polyol or dibasic esters, but with dramatically improved hydrolytic stability for applications where water ingress may impact lubricant performance.
The second topic is Perfad™ 3950 which is a lubricity additive/ package for synthetic and semi-synthetic metalworking formulations, which enables formulators to develop products with lubricity performance comparable to chlorinated paraffin containing fluids.
Priolube™ HS1000 – Liquid Amide Technology
Being a world leader in synthetic esters, Croda understands the performance attributes of ester based products and that there are select applications that require improved hydrolytic stability. Croda developed liquid amide technology to service that market need.
Priolube HS1000 (
Figure 1 – Physical properties) is the first product launched in what is intended to be a family of products to achieve the customer need of ester like performance but with improved hydrolytic stability. It is anticipated that multiple viscosity grades of liquid amide technology will be launched over the next several years.
Priolube HS1000 has all the traditional benefits of an ester:
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High thermal and oxidative stability
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Low temperature performance (viscosity and pour point)
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Strong additive solubility performance
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Seal swell characteristics
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Fully miscible with non-polar basestocks and mineral oils
Priolube HS1000 does all the above and is not susceptible to hydrolysis (
Figure 2). Additionally, being an amide Priolube HS1000 also carries the benefits of being a polar base oil. Those benefits include solvency, detergency, dispersancy, and lubricity.
Performance Data
Priolube HS1000 was specifically designed to possess the following properties.
We first looked to demonstrate improved oxidation stability of amides by the ASTM D943 wet test, also called the turbine oil stability test, or TOST. This test attempts to determine the expected life of a turbine oil by subjecting it to oxidative and hydrolytic stress using oxygen, high temperature, water and metal catalysts.
Figure 3 shows the number of hours it took to increase to an acid number of 2. The least stable unsaturated mono-ester reached an acid number of 2 in 6 hours, the di-ester took 13 hours, and the polyol ester is about three times as stable. Priolube HS1000, did not reach an acid number of 2 for 959 hours, demonstrating its improved oxidation stability.
We also performed hydrolytic stability testing in accordance with ASTM D2619 (
Figure 4) on a fully formulated ISO 320 PAO based industrial gear oil, with 10% of the ester or Priolube HS1000 and 2.65% of an industrial gear oil additive package in order to understand the rate of hydrolysis of esters and Priolube HS1000.
Knowing that polyol esters typically perform well under standard conditions, we increased the duration of this test to 5x its normal length to 240 hrs in order to increase the severity and demonstrate performance in extreme conditions.
This test method differentiates the relative stability of hydraulic fluids in the presence of water under the conditions of the test. Hydrolytically unstable hydraulic fluids form acidic and in soluble contaminants which can cause hydraulic system malfunctions due to corrosion, valve sticking, or change in viscosity of the fluid.
Finally, we looked at the stability of the industrial gear oil package with ester or amide present (
Figure 5). The diester did not solubilize the additive package even at 10%, while the polyol ester and Priolube HS1000 formed clear stable solutions. Once concentration was lowered to 5%, samples containing polyol ester became hazy, while samples containing Priolube HS1000 were still clear.
If you want all the benefits of ester technology with improved hydrolytic stability – Priolube HS1000 needs to be in your formulation tool kit.
Priolube HS1000 generated 20-30 times less acid than the ester based formulation, similar to the sample with all PAO.
Perfad™ 3950
With the growing concern surrounding chlorinated paraffins in metalworking fluids, Croda would like to remind the market place of our product offer that allows formulators to provide products that have lubricity performance as good as chlorinated paraffins but without the regulatory concerns.
Croda’s Perfad 3950 offers high lubricity performance in metal working fluids without the use of chlorine, sulfur or phosphorous containing materials.
In addition to superior, multi-metal cutting performance, Perfad 3950-based formulations have intrinsically low foam profiles, excellent bio-resistance and tramp oil rejection characteristics.
Figure 6 compares Perfad 3950 performance to a chlorinated soluble oil (17% chlorine content). The oil-free formulation compares favorably with the chlorinated product while the semisynthetic significantly outperforms the chlorinated material.
Perfad 3950 continues to out-perform industry-leading commercial products both in the field with multiple case studies available giving 3x tool life and on the Microtap—without the use of chlorinated paraffins.