Ashless Phosphorus-Containing Lubricating Oil Additives 93
Test conditions: 40 kg, 100 rpm, 60 min, 121°C
Four-ball wear scar diameter (mm)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Nonyl phenolOleyl alcohol
Dodecyl phenolDinonyl phenolLauryl alcohol
Tricresyl phosphate (neutral)Base oil (100 s naphthenic)
(a)
(b)
Test conditions: 100 kg, 100 rpm, 60 min, 121°C
Four-ball wear scar diameter (mm)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Nonyl phenolOleyl alcohol
Dodecyl phenolDinonyl phenolLauryl alcohol
Base oil (100 s naphthenic)
FIGURE 3.13 Effect of hydrophobe on wear properties—four-ball wear scar diameter. Acid phosphate
esters based on nonionics containing 23–25% ethylene oxide.