The invention relates to food-grade lubricating
grease as well as a preparation method and application thereof. The food-grade lubricating
grease comprises the following components by weight percent: 70-80% of
base oil, 6-15% of
thickening agent and 10-20% of antiwear agent. The preparation method comprises the following steps: adding
fatty acid,
aromatic acid and organic aluminum into the
base oil in a proportion, mixing and heating to 60-100 DEG C, and carrying out a recombination reaction for 1-2 hours; further heating the combined material to 100-140 DEG C, adding
tap water with a certain proportion and then maintaining the constant temperature for 1-2 hours, wherein
water equivalent is 1-3 times that of organic aluminum; further heating the combined material to 150-180 DEG C and the nmaintaining the constant temperature for 0.5-1 hour; then adding
quenching oil and evenly mixing, wherein the amount of
quenching oil is about 30%-40% of that of
base oil; and further cooling the material to the temperature below 140 DGE C, and adding the antiwear agent and then evenly mixing, so as to obtain the required product. In the invention, a one-
step method is adopted for direct recombination reaction, thus process is simple,
energy consumption is reduced, production cost is reduced, and the quality of the product produced by the process is relatively stable.