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Zincdialkyldithiophosphate,
Zincdiaryldithiophosphate (ZnDDP)
|
| Name |
CAS no |
| Zinc O,O-di(C1-14-alkyl) dithiophosphates | 68649-42-3 |
| Zinc (mixed O,O-bis(sec-butyl and isooctyl)) dithiophosphates | 113706-15-3 |
| Zinc-O,O-bis(branched and linear C3-8-alkyl) dithiophosphates | 133628-63-4 |
| Zinc O,O-bis(2-ethylhexyl) dithiophosphate | 4259-15-8 |
| Zinc O,O-bis(mixed isobutyl and pentyl) dithiophosphates | 68457-79-4 |
| Zinc mixed O,O-bis(1,3-dimethylbutyl and isopropyl) dithiophosphates | 84605-29-8 |
| Zinc O,O-diisooctyl dithiophosphate | 28629-66-5 |
| Zinc O,O-dibutyl dithiophosphate | 6990-43-8 |
| Zinc mixed O,O-bis(2-ethylhexyl and isobutyl and isopropyl) dithiophosphates | 85940-28-9 |
| Zinc O,O-bis(dodecylphenyl) dithiophosphate | 54261-67-5 |
| Zinc O,O-diisodecyl dithiophosphate | 25103-54-2 |
| Zinc O-(6-methylheptyl)-O-(1-methylpropyl) dithiophosphate | 93819-94-4 |
| Zinc O-(2-ethylhexyl)-O-(isobutyl) dithiophosphate | 26566-95-0 |
| Zinc O,O-diisopropyl dithiophosphate | 2929-95-5 |
| Zinc (mixed hexyl and isopropyl) dithiophosphates | 68412-58-8 |
| Zinc (mixed O-(2-ethylhexyl) and O-isopropyl) dithiophosphates | 68909-93-3 |
| Zinc O,O-dioctyl dithiophosphate | 7059-16-7 |
| Zinc O,O-dipentyl dithiophosphate | 7282-31-7 |
| Zinc O-(2-methylbutyl)-O-(2-methylpropyl) dithiophosphate | 94022-84-1 |
| Zinc O-(3-methylbutyl)-O-(2-methylpropyl) dithiophosphate | 94022-85-2 |
The Products Register lists about 30 different substances/groups of substances of this type.
ZnDDP is usually manufactured by first forming dialkyldithiophosphates by a reaction between phosphorus sulphide (P4S10) and alcohol. These are then neutralised by adding zinc oxide, whereupon ZnDDP is obtained.
Zinc dialkyl- and diaryldithiophosphates are used in many lubricating oils as anti-wear agents. These compounds are multifunctional because they are also anti-corrosive and anti-oxidative. They have been used since the 1930s and today are the dominant anti-wear agent, occurring in virtually every motor oil on the market.
ZnDDP is used in motor oils, hydraulic pumps, gear boxes, transmissions and metal machining. Usually ZnDDP constitutes about 1% of these oils, and it acts by creating a protective layer on metallic surfaces at elevated pressures and temperatures. Anti-wear agents functioning in this way are usually called EP additives, EP being short for “extreme pressure”. The characteristic of substances of this type is that at a certain given pressure and temperature they disintegrate and, with their functional groups (sulphur and/or phosphorus) react with the iron in the metal.
These inorganic ironsulphides and/or ironphosphides which are formed provide extremely strong layers on the metallic surfaces, added to which, they give a lower coefficient of friction.
Contact person: Margareta Östman,
Tel +468 519 411 62
Swedish Chemicals Agency Box 2 SE-172 13 Sundbyberg, kemi@kemi.se
Tel +468 519 411 00 Fax +468 735 7698