| 摘要 |
Environmentally friendly lubricating grease comprises: (A) a base oil which is a natural oil or synthetic triglyceride of formula where R1, R2 and R3 each = 7 - 23 C aliphatic gps.; and (B) a thickener which is a reaction prod. of: (B1) a metal based material, and (B2) a carboxylic acid or its ester. (B1) comprising a metal oxide, metal hydroxide, metal carbonate or metal bicarbonate, where the metal is alkali metal or alkaline earth metal, and (B2) is: R4(COR5)n; R4 = 4 - 29 C aliphatic gp.; R5 = H or 1 - 4 C aliphatic; n = integer 1 - 4. The prepn.of the grease involves: (a) mixing (A), (B1) and (B2) in wt. ratio of (A):(B) of 50:50 to 95:5; (b) heating the mixt. to 82 - 105 [deg]C to form (B); (c) heating mixt. to final temp. of 145 [deg]C (alkaline metal) or 200 [deg]C (alkali metal); and (d) cooling to form a grease. |
