Lubricating oils are liquid lubricants, which primarily serve to reduce friction and wear at bearings and contact points. Secondary tasks include protection of corrosion, transport of heat and removal of disturbing particles from the friction point. Lubricating oils fulfil their function in machine elements, as metal working fluids and as hydraulics. They are water miscible or not, their basis is mineral or synthetic.
Fatty acids, alkali and metallic soaps as additives
Due to their polar character fatty acids have an excellent adhesive force on metallic surfaces. Under suitable conditions of pressure, temperature and concentration they build metal soap layers with the basic material. These carry the load in the area of boundary lubrication, i.e. where the basic oil alone can no longer become effective and the high-pressure additives have not yet become effective. Alkali soaps as well have a high affinity to metals. Their effort to cover such surfaces and their natural alkalinity gives them corrosion-protective and lubrication-supporting properties. Metal soaps on aluminium basis influence the structure of the base oil.
LIGACID OW
LIGACID OB
Surface active oleic acids. Additions of 0.3-1% increase the lubrication effect of mineral-oil based formulations.
LIGALUB FSO
12-hydroxy stearic acid for excellent lubrication support in mineral-oil based formulations.
LIGA KALIUMOLEAT 90
Alkali soap on oleic acid basis. Quantities of 0.5-2% improve corrosion protection and lubricity of mineral oil formulations. Anionic emulsifier in coolants.
LIGA ALUMINIUMSTEARAT TR
LIGA ALUMINIUMSTEARAT DT
Aluminium soaps in low addition quantities, hotly dispersed in base oil, change the viscosity and the shearing behaviour, improve the adhesiveness of lubricants on mineral or synthetic basis. They stabilize the dispersion of pigments, e.g. in graphit/MoS2-lubricants.
Synthetic esters as additives in mineral oil formulations
Owing to their polar properties synthetic esters are important lubricating agents in mineral oil based formulations. They have a higher wetting effect as mineral oils and spread over the metallic surface, where they reduce sliding friction and increase corrosion protection. Esters with free OH-groups support the emulsifying system in water miscible formulations.
LIGALUB 10 GE
LIGALUB 12 GE
Glycerol monooleate and Glycerol dioleate. Additions of 1-2% increase the affinity to the metal surface and improve lubricity and corrosion protection. In water miscible oils they are also used as emulsifiers.
LIGALUB 18 TMP
Trimethylolpropane trioleate. For lubrication improvement in water miscible and non water miscible metal working oils, especially for NE-metals (aluminium).
LIGALUB 45 ITD
Isotridecyl stearate. Lubricating agent with good oxidation stability for broad application in the water miscible area.
LIGALUB 51 PE
Pentaerythritol monooleate. Friction modifier in non water miscible formulations.
LIGALUB PEG 400 MO
Ethylene glycol monooleate. Lubricity improver and emulsifier with moderate foaming properties in water miscible lubricants.
Synthetic esters as base oils for environmentally acceptable lubricants
The products of this series are based on natural raw materials of animal and vegetable origin. They are free of solvents and mineral oils and they are the choice in many application cases when mineral oil has to be replaced, e.g. for hydraulic oils, gear oils, motor oils, corrosion protection oils and coolants, or in the area of loss lubrication (e.g. two stroke oils). In their properties lubricity, viscosity index, low-temperature behaviour, volatility and biodegradability synthetic esters are definitely superior to mineral oils. Due to their excellent lubricity it can in many cases be dispensed with chlorine, sulphur and phosphorus addition, when formulating water miscible metal working fluids. With regard to oxidation and hydrolysis stability as well as quality constancy they are to be preferred to vegetable oil raffinates e.g. from rape-seed, soybean, sunflower which are also used as base stocks.
LIGALUB 18 TMP
Trimethylolpropane trioleate. Unsaturated ester of good hydrolytic stability. Available in the viscosities 46 and 68, as 46 also on pure vegetable basis.
LIGALUB 51 PE
Pentaerythritol monooleate. Unsaturated partial ester with high surface affinity and good hydrolysis resistance. V40: approx. 110 mm2/s.
LIGALUB 52 PE
Pentaerythritol tetraoleate. Unsaturated ester of good hydrolytic stability. V40: 40-50 mm2/s.
