Lubricant Additives

94 Lubricant Additives: Chemistry and Applications

Test conditions: 40 kg, 100 rpm, 121°C, 60 min

Four-ball wear scar diameter (mm)

0

0.2

0.4

0.6

0.8

1

0204060

Ethylene oxide (wt%)

(a)

Test conditions: 100 kg, 100 rpm, 121°C, 60 min

Four-ball wear scar diameter (mm)

0

0.2

0.4

0.6

0.8

1

0204060

Ethylene oxide (wt%)

(b)

Oleyl alcohol 40 kg

Dinonyl phenol 40 kg

Oleyl alcohol 100 kg

Dinonyl phenol 100 kg

FIGURE 3.14 Effect of ethylene oxide content on wear properties 1% of additive in 100 SUS (100°F) naph-
thenic base oil.

conditions. Of greater relevance than conventional four-ball or pin and v-block tests are actual
cutting or tapping torque tests. The results given in Table 3.12 show that (1) products with a hydro-
philic–lipophilic balance (HLB) value of 11–12 give the best results and (2) in general, the further
the value deviates from this, the worse the results become. Unfortunately, no studies appear to have