Patent PL-178076-B1 (PL)
Title: Multifunctional aircraft grease and method of making same
Inventor: STANKOWSKI LESZEK
IPC: C10M169/04
Filed: 1995-07-14
Abstract: 1. Multifunctional aviation lubricants based on polyalphaolefin oil and ester oil and lithium 12-hydroxystearate, lithium stearate and lithium azelate, which contains from 10.0 to 30.0 percent of polyalphaolefin oil, from 15.0 to 45.0 percent of sebacate or azelate of 2-ethylhexyl or 2,2' dimethylhexyl, from 0.0 to 20.0 percent of the ester of the mixture of fatty acids (C6-C16) of pentaerythrite, from 8.0 to 13.0 percent of lithium 12-hydroxystearate, from 0.0 to 1.0 percent of lithium stearate, from 0.7 to 3.0 percent of lithium azelate, preferably - from 0.0 to 0.5 percent (w/w) of alkylarylcarboxylic acid or from 0.0 to 3.0 percent of boric acid ester or from 0.0 to 0.2 percent of boric acid and/or from 0.0 to 0.5 percent of salicylic acid or its alkyl derivative (C2-C20) and from 0.0 to 3.0 percent of alkylarylaromatic diamine or from 0.0 to 3.0 percent of alkyl or isoalkyl (C2-C10) derivative of triphenylphosphite and from 0.5 to 2.0 percent of zinc dialkyldithiocarbamate, and/or from 0.0 to 0.5 percent of thiadiazole derivative with sulphurised alkyl chain. 2. The method of producing multifunctional aviation lubricant, whereby from 10.0 to 30.0 percent of polyalphaolefin oil is entered to from 7.8 to 12.7 percent of 12-hydroxystearic acid and from 0.0 to 1.0 percent of stearic acid; further, the mixture is heated to 80-95 degrees C, and from 1.1 to 2.8 percent of lithium hydroxide hydrate and from 1.1 to 2.8 percent of water is added to the mixture; the temperature of 80-95 degrees C is maintained for 2 hours, further from 0.0 to 3.0 percent of alkyl or isoalkyl (C2-C10) derivative of triphenylphosphite is added; the temperature is gradually raised to 160-180 degrees C, next, from 10.0 to 30.0 percent of sebacate or azelate of 2-ethylhexyl or 2,2' dimethylhexyl is poured; further, the temperature is raised again to 200-205 degrees C and from 5.0 to 15.0 percent of sebacate or azelate of 2-ethylhexyl or 2,2' dimethylhexyl is added; next, from 0.7 to 2.8 percent of azelaic acid is added while the temperature is maintained at 160-180 degrees C for 2 hours; the mixture is then cooled to 90-100 degrees C and from 0.1 to 0.5 percent of lithium hydroxide hydrate is added and, after 15 minutes, preferably from 0.0 to 0,5 percent of alkylarylcarboxylic acid or from 0.0 to 3.0 percent of boric acid ester or from 0.0 to 0.2 percent of boric acid is added; when the temperature of the mixture reaches 130-140 degrees C, preferably from 0.0 to 0.5 percent of salicylic acid or its alkyl derivative (C2-C20) and from 0.0 to 20.0 percent of the ester of the mixture of fatty acids (C6-C16) of pentaerythrite is added, then the temperature is raised to 180-185 degrees C and maintained for 3 hours; further, the mixture is cooled to the room temperature and preferably from 0.0 to 3.0 percent of alkylarylaromatic diamine and from 0.5 to 2.0 percent of zinc dialkyldithiocarbamate, and/or from 0.0 to 0.5 percent of thiadiazole derivative with sulphurised alkyl chain are added to the mixture, and the final mixture is properly homogenized.