Search

CN-121991738-A - Ultrahigh-rotation-speed lubricating grease composition and preparation method thereof

CN121991738ACN 121991738 ACN121991738 ACN 121991738ACN-121991738-A

Abstract

The application relates to the technical field of lubricating grease, and particularly discloses an ultrahigh-rotation-speed lubricating grease composition and a preparation method thereof. An ultrahigh-rotation-speed lubricating grease composition comprises, by weight, 64-84.8 parts of base oil, 15-30 parts of a thickening agent, 1-5 parts of polymer microspheres, 0.1-1 part of an antioxidant and 0.1-1 part of a corrosion inhibitor, wherein the polymer microspheres comprise alpha, omega-aminopropyl disiloxane, isocyanate and an amine chain extender. The ultrahigh-speed lubricating grease composition has excellent structural stability and oxidation stability under the ultrahigh-speed working condition, can effectively lubricate under the extreme working condition, prolongs the service life of equipment, and is suitable for DN values reaching 200 ten thousand.

Inventors

  • CAO JIE

Assignees

  • 湖北博达特种润滑剂有限公司

Dates

Publication Date
20260508
Application Date
20260112

Claims (8)

  1. 1. The ultra-high-speed lubricating grease composition is characterized by comprising, by weight, 64-84.8 parts of base oil, 15-30 parts of thickener, 1-5 parts of polymer microspheres, 0.1-1 part of antioxidant and 0.1-1 part of corrosion inhibitor, wherein the polymer microspheres comprise alpha, omega-aminopropyl disiloxane, isocyanate and amine chain extender.
  2. 2. The ultra-high rotational speed grease composition according to claim 1, wherein the base oil comprises a polyalphaolefin having a mass ratio of (1-10): 1 and a synthetic ester oil having a kinematic viscosity at 100 ℃ of 2-10mm 2 /s, the synthetic ester oil being selected from any one or a combination of two or more of a diester, a polyol ester and an aromatic ester.
  3. 3. The ultra-high rotational speed grease composition according to claim 1, wherein the method of preparing the polymeric microspheres comprises the steps of: Dissolving alpha, omega-aminopropyl disiloxane in a mixed solvent of acetonitrile and acetone to form a solution A, and dissolving isocyanate in a mixed solvent of acetonitrile and acetone to form a solution B; dropping the solution A into the solution B under the condition of stirring, and continuing stirring for 25-45min after the dropping is finished to form a prepolymer solution; Dissolving an amine chain extender in acetone to obtain a solution C, dropwise adding the solution C into the prepolymer solution under the condition of stirring, and continuously stirring for 25-45min after the dropwise adding is finished to obtain an organosilicon polyurea prepolymer; adding water into the organosilicon polyurea prepolymer, stirring for 5-10min, continuously reacting for 4-5h in a water bath at 30-35 ℃, separating, purifying and drying to obtain the polymer microsphere.
  4. 4. The ultra-high rotational speed grease composition according to claim 3, wherein the amine chain extender comprises a sulfur-containing amine chain extender and a phosphorus-containing amine chain extender.
  5. 5. The ultra high speed grease composition according to claim 3, wherein the polymer microspheres are subjected to the following post-treatments: dispersing the polymer microspheres in absolute ethyl alcohol, and performing ultrasonic treatment to form a dispersion liquid; Adding stearic acid into the dispersion liquid, regulating the pH to 8-9 by using triethylamine, heating, stirring and reacting for 2-3h, centrifuging, washing and drying to obtain the final product.
  6. 6. The ultra-high rotational speed grease composition according to claim 1, wherein the thickener is a complex barium soap, and the raw material comprises dodecahydroxystearic acid, azelaic acid or sebacic acid, and barium hydroxide octahydrate.
  7. 7. The ultra-high rotational speed grease composition according to claim 1, wherein the antioxidant is any one or a combination of more of alkylphenol compounds and arylamine compounds.
  8. 8. A method of preparing an ultrahigh-speed grease composition according to any one of claims 1 to 7, comprising the steps of: Adding the base oil, the thickening agent and the polymer microspheres into water, heating and stirring, reacting for 1.5-2 hours at the constant temperature and the constant pressure of 0.4-0.5MPa to obtain a mixture, continuously heating to 210-230 ℃ after pressure relief, reacting for 10-20 minutes at the constant temperature, cooling to below 130 ℃, adding an antioxidant and a corrosion inhibitor, continuously stirring and cooling, starting to circularly shear for 1-1.5 hours, and discharging through a homogenizer to obtain the modified polyurethane foam.

Description

Ultrahigh-rotation-speed lubricating grease composition and preparation method thereof Technical Field The application relates to the technical field of lubricating grease, in particular to an ultrahigh-rotation-speed lubricating grease composition and a preparation method thereof. Background With the rapid upgrade of the global high-end equipment manufacturing industry, the running rotating speeds of key equipment such as a high-speed motor, a precision machine tool spindle, an aerospace transmission part, a high-speed centrifugal machine and the like continuously break through the limit, and more stringent requirements are put on the suitability of lubricating grease of mechanical equipment. In the industry, DN value (bearing inner diameter mm multiplied by rotating speed r/min) is generally used as a core evaluation index of the rotating speed adaptation capability of lubricating grease, the DN value demand of current high-end equipment on the lubricating grease is generally increased to more than 100 ten thousand, and even more than 150 ten thousand under extreme working conditions, so that the high-precision, high-efficiency and long-service-life operation of equipment is realized. The traditional lubricant generally takes mineral oil, synthetic hydrocarbon, poly alpha olefin and the like as base oil, takes lithium base, calcium base or composite lithium base and the like as thickening agent, and is assisted with additives such as antioxidants and the like. In view of the above related art, the inventors have found that these greases can meet the lubrication requirements of a typical high-speed bearing to some extent, but have significant limitations in performance under extreme conditions of ultra-high rotational speeds. Under the ultra-high rotating speed, the relative speed of the bearing rolling body and the roller path can be several times of the common rotating speed, the contact pressure is concentrated, and the heat generated by friction can not be timely dissipated, so that the local temperature in the bearing can be obviously increased. The action of the ultra-high shearing force and the high temperature can impact the molecular chain of the base oil to cause abnormal change of the kinematic viscosity of the lubricating grease, damage the colloid network structure of the thickener in the lubricating grease, cause the separation of oil soap and lead the lubricating grease to rapidly lose efficacy. In addition, most of antioxidants added into the traditional lubricating grease are of a single type (such as simple alkylphenols), the adding amount is large, but the antioxidants are weak in synergistic effect with other components of the lubricating grease, the oxidation resistance stability is reduced under the high-temperature and high-shear coupling environment with ultrahigh rotating speed, and the base oil and the thickening agent are easy to oxidize, so that the lubricating grease is hardened and coked, carbon deposition is generated to block a lubrication channel, and the abrasion of a bearing is aggravated. Disclosure of Invention The application provides an ultrahigh-speed lubricating grease composition and a preparation method thereof in order to improve the high-temperature stability and the oxidation stability of lubricating grease under the ultrahigh-speed working condition. In a first aspect, the present application provides an ultrahigh rotational speed grease composition, which adopts the following technical scheme: The ultra-high-rotation-speed lubricating grease composition comprises, by weight, 64-84.8 parts of base oil, 15-30 parts of thickening agent, 1-5 parts of polymer microspheres, 0.1-1 part of antioxidant and 0.1-1 part of corrosion inhibitor, wherein the polymer microspheres comprise alpha, omega-aminopropyl disiloxane, isocyanate and amine chain extenders. Through adopting above-mentioned technical scheme, add the polymer microballon in the lubricating grease, under the condition of super high rotational speed, can effectively reduce the great problem of temperature rise that leads to by the bearing is influenced by friction, prevent the problem of thermal runaway under the super high rotational speed operating mode, the nanometer polymer microballon can take place elastic deformation under the contact pressure of super high, form third body rolling friction between the friction pair, play microcosmic ball effect, turn into rolling friction with some sliding friction, thereby directly reduce coefficient of friction, show the production that reduces frictional heat, guarantee the complete stability of three-dimensional fiber network structure in the lubricating grease. The polymer microsphere is a composite structure microsphere of organic silicon and polyurea prepared by taking alpha, omega-aminopropyl disiloxane, isocyanate and amine chain extender as raw materials, and the organic silicon and the polyurea have high temperature resistance stability, so that the decomp