Publication Date: 2005-Aug-31
The IP.com Prior Art Database
Madelein Kleyn: ATTORNEY [+1]
Development of a dry chain lubricant based on a Fischer Tropsch (FT) wax emulsion.
Development of a dry chain lubricant based on a FT-wax emulsion.
Normal oil-based lubricants stay oily (wet) when used on driving chains and a build up of dirt is often experienced when used in a dusty environment. To overcome this, various products based on waxes dissolved in solvents or in emulsified form are used as lubricants for these applications where the solvents and water evaporate on application and leave a relatively dry lubricating coating that does not collect much dirt. These types of products are especially popular for off-road races on bicycles and motorcycles.
Fischer-Tropsch wax based products.
Fischer-Tropsch waxes are waxes derived from a Fischer-Tropsch reaction. In the Fischer-Tropsch process, synthesis gas (carbon monoxide and hydrogen) obtained from gasification of coal or reforming of natural gas, is reacted over a Fischer Tropsch catalyst in a low temperature Fischer Tropsch reaction to produce a mixture of hydrocarbons, including wax. In a low temperature Fischer-Tropsch reaction, the reaction takes place in a slurry bed reactor or fixed bed reactor, preferably a slurry bed reactor, at a temperature in the range of 160ºC - 280ºC, preferably 210ºC - 260ºC, and a pressure in the range of 18-50 bar, preferably between 20-30 bar, in the presence of a catalyst. The catalyst may include iron, cobalt, nickel or ruthenium.
Combinations or blends of different Fischer-Tropsch (FT) waxes can be used as lubricants. It has been found that FT waxes provide excellent performance advantages when used in chain lubricants.
The FT waxes are emulsified using anionic or non-ionic emulsifiers in a formulation such that the drying time of the emulsion is minimized on...