Food-grade lubricating grease and method for preparing same

Patent metadata

Field	Value
Publication number	US-11965141-B2
Application number	US-202217973687-A
Country	US
Kind code	B2
Filing date	Oct 26, 2022
Priority date	Apr 28, 2020
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

Disclosed is food-grade lubricating grease and a method for preparing the same, belonging to the technical field of lubricating grease. The food-grade lubricating grease is prepared from the following components in percentage by mass: 75% to 85% of food-grade white oil, 6% to 16% of stearic acid, 2.0% to 3.0% of benzoic acid, 4.7% to 8.7% of aluminum isopropoxide, 1.0% to 1.5% of water and 1.0% to 7.0% of nano-PTFE, and has good extreme-pressure, abrasion-resistant and friction-reduction properties, a last non-seizure load (PB) reaching 411.6 N, a sintering load (PD) reaching 1,960 N, and a friction coefficient reduced by 18.5%. The lubricating grease can be used for a food production industry and in household food appliances, the service life of a device and the service life of the food-grade lubricating grease are effectively prolonged, and meanwhile, food security is guaranteed to a certain degree.

First claim

What is claimed is:

1. A method for preparing food-grade lubricating grease, wherein the food-grade lubricating grease comprises the following components in percentage by mass: 75% to 85% of food-grade white oil, 6% to 16% of stearic acid, 2.0% to 3.0% of benzoic acid, 5% to 8.7% of aluminum isopropoxide, 1.0% to 1.5% of water and 1.0% to 7.0% of nano-PTFE; and the method comprises the following steps:
(1) mixing the food-grade white oil and the aluminum isopropoxide with the benzoic acid, and performing heating to completely dissolve the mixture to obtain a dissolved mixture;
(2) adding the stearic acid into the dissolved mixture in step (1), and dissolving the stearic acid through stirring to obtain a corresponding product system A;
(3) adding water into the product system A obtained in step (2) for saponification, performing dewatering after the saponification is completed, then, adding a second portion of the food-grade white oil, and raising the temperature for refining to obtain a product system B;
(4) adding a third portion of the food-grade white oil into the product system B obtained in step (3) after temperature raising refining, and performing grinding after cooling to obtain food-grade lubricating grease base grease; and
(5) mixing the food-grade lubricating grease base grease obtained in step (4) with food-grade nano-PTFE through stirring, and then, performing ultrasonic treatment and grinding to obtain the food-grade lubricating grease.

2. The method for preparing food-grade lubricating grease according to claim 1 , wherein the food-grade lubricating grease comprises the following components in percentage by mass: 78% to 82% of food-grade white oil, 10% to 12% of stearic acid, 2.0% to 3.0% of benzoic acid, 6.5% to 7.0% of aluminum isopropoxide, 1.0% to 1.5% of water and 5.0% to 7.0% of nano-PTFE.

3. The method for preparing food-grade lubricating grease according to claim 1 , wherein the food-grade white oil in step (1) has a kinematic viscosity of 28.8 cst to 33.5 cst at 40° C.

4. The method for preparing food-grade lubricating grease according to claim 1 , wherein the heating in step (1) is performed at 95° C. to 110° C. for 30 minutes to 40 minutes.

5. The method for preparing food-grade lubricating grease according to claim 1 , wherein the saponification in step (3) is performed at 110° C. to 115° C. for 20 minutes to 40 minutes.

6. The method for preparing food-grade lubricating grease according to claim 1 , wherein the temperature raising refining is performed at 200° C. to 210° C. for 20 minutes to 40 minutes.

7. The method for preparing food-grade lubricating grease according to claim 1 , wherein an amount of the food-grade white oil in step (1) accounts for 50% to 55% of a total amount of use of the food-grade white oil, an amount of the food-grade white oil in step (3) accounts for 20% to 25% of the total amount of use of the food-grade white oil, and an amount of the food-grade white oil in step (4) accounts for 25% to 30% of the total amount of use of the food-grade white oil.

8. The method for preparing food-grade lubricating grease according to claim 1 , wherein an amount of the food-grade white oil in step (1) accounts for 50% of a total amount of use of the food-grade white oil, an amount of the food-grade white oil in step (3) accounts for 25% of the total amount of use of the food-grade white oil, and an amount of the food-grade white oil in step (4) accounts for 25% of the total amount of use of the food-grade white oil.

9. The method for preparing food-grade lubricating grease according to claim 1 , wherein the mass percentage of the food-grade nano-PTFE in step (5) is 7%.

Assignees

• Univ Jiangnan

Inventors

• Qian Shanhua
• Gong Longfei
• Wang Wei
• Ni Zifeng
• Tang Juan

Classifications

• C10M169/044 Primary

  the additives being a mixture of non-macromolecular and macromolecular compounds · CPC title

• C10M101/04

  Fatty oil fractions · CPC title

• C10M129/40

  monocarboxylic · CPC title

• C10M129/50

  monocarboxylic · CPC title

• C10M139/00

  Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00 · CPC title