Characteristics of New Oil Soluble Polyalkylene Glycols
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1 Characteristics of New il Soluble Polyalkylene Glycols Dr. Govind Khemchandani The Dow chemical Company SP STLE HUSTN CHAPTER FEBURARY 9, 2011 Tel:
2 Introduction New SP technology offers many benefits in lubricant formulations SPs offer options to upgrade hydrocarbon oils to boost viscosity index and improve deposit control SPs can provide improved friction control when used as an additive. They may provide an alternative to synthetic esters as friction modifiers. The flexibility of PAG chemistry provides a huge amount of space for innovation and providing solutions to specifications and standards of the future
3 Evolution to SP technology Current Applications Refrigeration oils Water glycol fluids Quenchants Textile lubricants Gear lubricants Bearing oils Hydraulic oils Air Compressor fluids P E/P E water soluble PAGs Base Fluids Polymer design space Solder assist fluids B/E Surfactants Application expansion P/B B SP technology Base fluid or co-base fluid for crankcase oils. Auto & Industrial gear oil. Transmission fluids. Metal rolling oils. Surfactants.
4 Traditional PAG Polymerization Technologies Ethylene oxide (E) H 2 C CH 2 Propylene oxide (P) H 2 C CH CH 3 R=H, CH 3 CLASSICAL PLYMER STRUCTURES BASED N E & P Block Polymerization Initiator E block P block Random Polymerization Initiator 1 E 1 P... Inverse block Polymerization Initiator P block E block Initiators are typically monols, diols or triols (for example butanol, propylene glycol, glycerol). Polymers can be designed having a wide range of viscosities (10-20,000 cst at 40 o C) Extremely versatile and can be tailored designed to have many specific functionalities
5 Traditional PAGs Benefits & Perceived Challenges BENEFITS CHALLENGE Availability in a very wide range of viscosity grades with design flexibility High viscosity index Good low temperature properties Excellent deposit control and equipment cleanliness Hydrolytic stability Safe to Use il miscibility (compatibility)
6 Synthetic ptions in Designing il Soluble PAGs il miscibility of Homo-polymers H 2 C CH R Increasing the carbon to oxygen ratio in PAGs improves oil miscibility H 2 C CH Higher alphaolefin oxides Styrene xide H 2 C CH CH 2 CH 3 THF H 2 C CH CH 3 Butylene oxide H 2 C CH 2 Ethylene oxide Propylene oxide P Homo-polymers are partially oil miscible E Homo-polymers are water soluble and not oil miscible Carbon/oxygen ratio il miscibility in reference to Group I-IV Hydrocarbon oils
7 What is different? CHEMICAL CMPSITIN: PLYALKYLENE GLYCL VS. HYDRCARBN ILS Mineral il Petroleum- based Hydrocarbon Group I Base stock PA- Poly Alpha lefin- Synthetic Hydrocarbon il Group IV Non-Polar Heavily additized for oxidation stability and has poor solvency PAG Poly Alkylene Glycol Base Fluid Group V Polar R1 H(Me) H(Me) H(Me) H(Me) H(Me) H(Me) R2 Inherently thermooxidatively stable with high VI
8 xidation Processes Comparison Mineral & Synthetic Hydrocarbon il vs. Polyalkylene Glycols Non-Polar Fluid High MW Polar By-Products Agglomeration of Soft Contaminates High MW molecules grow, forming insoluble varnish that adheres to surfaces Polar Fluid Low MW Polar By-Products Homogeneous Solution Temperature, System, & time Additional degradation may occur, but by-products remain in solution
9 Controlling Deposit Formation using PAGs Mineral oil PAG synthetic Thousands of rotary screw air compressors and other turbo-machinery use conventional PAG technology In recent years, there has been an increasing number of reported cases associated with varnish and sludge formation in turbine-generator applications and especially gas turbines. PAGs are providing a solution. Gas turbine Field studies in emerging applications for PAGs such as tunnel boring and wind turbine lubricants show deposit free operation Wind turbine Tunnel boring Formulating lubricants by upgrading hydrocarbon oils with oil soluble PAGs as a co-base oil may provide solutions to controlling deposits
10 il Soluble PAGs Typical Physical Properties Grade Viscosity at 40 o C, cst Viscosity at 100 o C, cst Viscosity Index CCS viscosity at -20 o C, mpa.s ASTM D445 ASTM D445 ASTM D2270 ASTM D5293 SP SP SP SP SP SP n/d Grade Flash Point (CC), oc Fire Point, oc Four ball wear, mm Pour Point, oc ASTM D92 ASTM D92 ASTM D4172 ASTM D97 SP n/d <-43 SP <-43 SP n/d <-40 SP SP SP
11 Comparison Typical Properties of SP s / PA s UCN Grade Viscosity at 40 o C, cst Viscosity at 100 o C, cst Viscosity Index Pour Point deg. C ASTM D445 ASTM D445 ASTM D2270 ASTM D97 SP <-43 SP <-43 SP <-40 SP SP UCN Grade Viscosity at 40 o C, cst Viscosity at 100 o C, cst Viscosity Index Pour Point deg. C ASTM D445 ASTM D445 ASTM D2270 ASTM D97 PA PA PA PA PA
12 Expanding functionality of PAGs using SPs Use of SPs Expansion of formulators options Primary base oil in formulations Compressor/refrigeration oils Hydraulic fluids Gear & Bearing ils Engine/transmission ils Co-base oil Upgrade Group I-III mineral oils Upgrade PA s Improve additive solubility Additives Deposit control additive Friction modifier Viscosity builder in mineral oils
13 Miscibility of SPs in Common Base ils Typical Miscibility Features Chemistry SP/Base il SP/Base il SP/Base il 10/90 w/w 50/50 w/w 90/10 w/w Group I Mineral oils Miscible Miscible Miscible Group II and III Mineral Miscible Miscible Miscible oils PA-4, 6, 8 Miscible Miscible Miscible PA-40 Partial Miscible Partial Miscible Partial Miscible Diesters & Polyol esters Miscible Miscible Miscible Naphthenics Miscible Miscible Miscible PAG s - P homopolymers Miscible Miscible Miscible Miscibility defined as clear homogeneous solutions before and after storing at ambient temperature and 80 o C for 168 hours Example above shows specifically SP-46 / SP-36 fully miscible with PA-40 Miscibility improvements ongoing with higher viscosity PAs
14 Stribeck Curves of SPs versus Conventional PAGs (IS VG-46) Traction coefficient Stribeck curves at 40oC, SRR = 50%, Pressure 1.1GPa E/P Random copolymer P homopolymer P/B copolymer Traction coefficients were measured on a Mini Traction Machine with a ¾ inch steel ball rotating on a steel disk Directly comparing alkoxide chemistries Speed, mm/sec Friction coefficients E/P< P/B < P Stribeck curves at 100oC, SRR = 50%, Pressure = 1.1GPa Traction coefficient Speed, mm/sec E/P random Copolymer P Homopolymer P/B copolymer
15 Friction Performance of SPs as Additives Mini-Traction Machine, steel ball on steel disc, temperature 80 o C,, slide roll ratio = 10%, contact pressure = 0.9GPa PA Friction coefficient PA + 10% SP-46 Under high contact pressures, SPs impart friction reducing properties in hydrocarbon base stocks. The polar nature of PAGs helps migration to the metal surface. Mechanism of action is being studied
16 Friction Performance of SPs as Additives in PA Mini-traction machine, steel ball on steel disc, temperature 80 o C,, SRR = 10%, Pressure = 0.9GPa Friction Coefficient PA PA + 10% SP PA + 8% SP PA + 5% SP PA + 8% Polyol ester Time (s) Polyalphaolefin is a PA-8 base oil (un-additized) SP s may offer another choice to esters and other film forming additives
17 Deposit Control : Extended ASTM D2893 at 120 C Group I Mineral il Deposit formation Group I Mineral il + SP-46 (5%) 0d 50d Deposit free 0d 50d
18 xidation Stability Using RPVT Method il Soluble PAG Base il (ISVG-46) with 2% anti-oxidant Formulation Phenolic A 1 % Phenolic A 2 % Aminic A 3 % Aminic A 4 % RPVT (min) A (Base il) B C D E F Proprietary (2%) 1530 Method used was ASTM D2272 Rotary Pressure Vessel xidation Test
19 NACK Volatility NACK Volatility, CEC L-40 % Weight Evaporation Loss SP-32 SP-46 SP-68 SP-150 SP-220 Viscosity Grade Virgin SP Base il 1% A 2% A Test Duration 60 minute, Temperature = 250 o C GPC Mol. Weight Distribution SP polymerization technology produces a broad molecular weight distribution
20 UCN SP Recommended Applications & Uses Base il Uses Selection criteria s based on typical viscosity requirements for specific applications Additive Uses PAGs are being used in grease formulations. SP 220 has been used for Li complex grease formulation.
21 Conclusions The formulators and researchers have another option for using PAGs as a tool for solving some of our industry problems. Formulators can now use il Soluble PAGs as a primary base oil, a co-base oil or as an additive in formulations Equipment conversions from hydrocarbon oils to il Soluble PAGs is simpler and less problematical SPs offer options to upgrade hydrocarbon oils to boost viscosity index and improve deposit control SPs can provide improved friction control when used as an additive. They may provide an alternative to synthetic esters as friction modifiers. The flexibility of PAG chemistry provides a huge amount of space for innovation and providing solutions to specifications and standards of the future
22 THANK YU Questions: Tel:
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