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CN-121991736-A - Composite lubrication additive of CS@PDA/metal compound with nano core-shell-satellite structure, and preparation method and application thereof

CN121991736ACN 121991736 ACN121991736 ACN 121991736ACN-121991736-A

Abstract

The invention discloses a composite lubrication additive of a CS@PDA/metal compound with a nano core-shell-satellite structure, and a preparation method and application thereof, belonging to the technical field of nano materials; and then ZnO nano particles or LDH nano sheets are grown on the surface of the CS@PDA intermediate in situ through hydrothermal synthesis and heat treatment processes, so that the nano core-shell-satellite structure CS@PDA/metal compound composite lubricating additive is obtained, has good antifriction and antiwear effects, can obviously improve antifriction and antiwear properties of materials after being mixed with base oil to prepare mixed oil, and is simple in preparation process and higher in material stability.

Inventors

  • FEI JIE
  • CHENG PENG
  • XIA YING
  • YAN JIFENG
  • Wang running
  • LI HEJUN
  • QI LEHUA

Assignees

  • 西北工业大学

Dates

Publication Date
20260508
Application Date
20260119

Claims (10)

  1. 1. A preparation method of a nano core-shell-satellite structure CS@PDA/metal compound composite lubrication additive is characterized by comprising the steps of uniformly coating a PDA layer on the surface of nano core structure CS particles by utilizing self-polymerization-adhesion characteristics of dopamine to form a CS@PDA intermediate with a core-shell structure, and growing ZnO nano particles or LDH nano sheets on the surface of the CS@PDA intermediate in situ through hydrothermal synthesis and a heat treatment process to obtain the nano core-shell-satellite structure CS@PDA/metal compound composite lubrication additive.
  2. 2. The method for preparing the composite lubrication additive of the CS@PDA/metal compound with the nano core-shell-satellite structure according to claim 1 is characterized by comprising the following steps of: 1) Obtaining CS particles with a nano-core structure; 2) Obtaining Tris-HCl buffer solution; 3) Adding the nano-core structure CS particles obtained in the step 1) into the Tris-HCl buffer solution obtained in the step 2) at room temperature, and performing ultrasonic dispersion to uniformly disperse the nano-core structure CS particles to obtain a suspension C; Weighing dopamine hydrochloride, dissolving the dopamine hydrochloride in the suspension C, stirring to obtain a suspension D, filtering the solution after reaction to obtain a precipitate, and washing and drying to obtain a CS@PDA intermediate with a core-shell structure; 4) The composite lubrication additive with the nano core-shell-satellite structure CS@PDA/metal compound is prepared by the nano core-shell structure CS@PDA particles.
  3. 3. The method for preparing the composite lubrication additive of the cs@pda/metal compound with the nano core-shell-satellite structure according to claim 2, wherein the specific operation of the step 2) is as follows: Tris (hydroxymethyl) aminomethane was added to deionized water to prepare a solution, and the pH was adjusted to 8.5 to obtain Tris-HCl buffer with ph=8.5.
  4. 4. The method for preparing a nano-core-shell-satellite structure cs@pda/metal compound composite lubricant additive according to claim 3, wherein in step 2), the concentration of tris (hydroxymethyl) aminomethane in the buffer solution B is 0.01-0.03 mol/L.
  5. 5. The preparation method of the nano core-shell-satellite structure CS@PDA/metal compound composite lubrication additive is characterized in that when the nano core-shell-satellite structure CS@PDA/metal compound composite lubrication additive is CS@PDA/ZnO composite lubrication additive, the specific process of the step 4) is that the nano core-shell structure CS@PDA particles obtained in the step 3) are added into deionized water for ultrasonic dispersion, zinc acetate dihydrate is added, the pH value is regulated, ultrasonic treatment is carried out, a mixed solution E is obtained, the mixed solution E is subjected to hydrothermal reaction in a reaction kettle, and the mixed solution E is dried after washing, so that the CS@PDA/ZnO composite lubrication additive is obtained.
  6. 6. The method for preparing the composite lubrication additive of the cs@pda/metal compound with the nano-core-shell-satellite structure according to claim 5, wherein the hydrothermal reaction is performed at 80-100 ℃ for 2-4 h, the concentration of cs@pda in the mixed solution E is 2-3 g/L, and the concentration of zinc acetate dihydrate is 0.03-0.05 mol/L.
  7. 7. The preparation method of the nano core-shell-satellite structure CS@PDA/metal compound composite lubrication additive is characterized in that when the nano core-shell-satellite structure CS@PDA/metal compound composite lubrication additive is CS@PDA/LHD composite lubrication additive, the specific process of the step 4) is that the nano core-shell structure CS@PDA particles obtained in the step 3) are added into deionized water for ultrasonic dispersion, cobalt nitrate hexahydrate, aluminum nitrate nonahydrate and urea are added, a mixed solution F is obtained after ultrasonic treatment, the mixed solution F is subjected to hydrothermal reaction in a reaction kettle, and the washed mixed solution F is dried, so that the CS@PDA/LHD composite lubrication additive is obtained.
  8. 8. The method for preparing the composite lubrication additive of the CS@PDA/metal compound with the nano core-shell-satellite structure according to claim 7, wherein the concentration of CS@PDA, cobalt nitrate hexahydrate, aluminum nitrate nonahydrate and urea in the mixed solution F is 2-3 g/L, 0.005-0.02 mol/L, 0.01-0.04 mol/L and 0.01-0.06 mol/L respectively; The hydrothermal reaction continues at 90-110 ℃ for 20-25 h.
  9. 9. A nano core-shell-satellite structure cs@pda/metal compound composite lubrication additive, characterized in that the nano core-shell-satellite structure cs@pda/metal compound composite lubrication additive is prepared by a preparation method based on the nano core-shell-satellite structure cs@pda/metal compound composite lubrication additive as defined in any one of claims 1-8.
  10. 10. Use of a nano-core-shell-satellite structured cs@pda/metal compound composite lubricant additive according to claim 9 in the field of lubricant additives.

Description

Composite lubrication additive of CS@PDA/metal compound with nano core-shell-satellite structure, and preparation method and application thereof Technical Field The invention belongs to the technical field of nano materials, and relates to a composite lubrication additive of a CS@PDA/metal compound with a nano core-shell-satellite structure, a preparation method and application thereof. Background The lubricating additive is a core element for improving the performance of lubricating oil products and guaranteeing the efficient and stable operation of mechanical systems. With the rapid development of modern industry, major equipment and key components are evolving towards high speed, heavy load, high precision and long service life, service conditions are increasingly severe, and multiple challenges of extreme pressure, high temperature, high load, complex chemical environment and the like are often faced. This places unprecedented higher demands on the lubrication performance, stability and durability of the lubricant. The development of the high-performance lubricating additive has great strategic significance for remarkably reducing the friction and wear of equipment, reducing energy consumption, prolonging the service life of the equipment and improving the operation reliability under extreme working conditions, and is a technical progress in the key fields of high-end equipment manufacturing, transportation, aerospace, energy chemical industry and the like. In the technical development of lubricating additives, various patents have proposed different solutions. The publication No. CN120682630A provides a black phosphorus-based composite material, a preparation method and application thereof, wherein black phosphorus and nano ferroferric oxide are subjected to ultrasonic dispersion in an alkaline aqueous solution and then subjected to hydrothermal reaction to form a primary composite, and then a polydopamine layer is coated on the surface of the composite through in-situ polymerization of dopamine under a weak alkaline condition, so that a black phosphorus/ferroferric oxide/polydopamine composite structure with a three-component synergistic lubrication effect is constructed, wherein the ferroferric oxide is used as a catalytic active center to promote the generation of a protective film containing P-C and C-N bonds in the friction process, the black phosphorus provides lamellar slip characteristics, and the polydopamine enhances interface bonding and dispersion stability, so that the friction coefficient of the material is reduced by about 46% when 0.1wt% of the material is added into lubricating oil or lubricating grease, but the preparation of the composite material is required to undergo liquid phase reaction and centrifugal separation, the process control is complicated, and the black phosphorus is easily oxidized and degraded in the processing process, and the product stability and the batch consistency are affected. The publication No. CN120758268A provides an ionic liquid modified conductive two-dimensional material @ MoS2 lubricating additive, a preparation method and application thereof, wherein after a few-layer conductive two-dimensional material with hydroxyl groups on the surface is modified by aminosilane, a molybdenum source is directionally aggregated on the surface of the material by utilizing the action of static electricity and hydrogen bonds, moS2 nano sheets are grown in situ by a hydrothermal method to form a core-shell structure, and then the functional modification is realized by combining disulfide bonds of lipoic acid ionic liquid with sulfur vacancies in MoS2, so that the composite additive with conductive and lubricating functions is finally obtained, the friction coefficient of the material is reduced by 51.0 percent when 0.5-1.0wt% is added in polyurea lubricating grease, the abrasion volume is reduced by 99.1 percent, and bearing electric erosion can be effectively inhibited by forming a conductive network, but the preparation technology relates to multi-step surface modification and complex reaction processes, the requirements on control and dispersion stability of the two-dimensional material are extremely high, and the industrialization difficulty is increased. The publication No. CN119662326A provides a self-repairing lubricating additive for a wind turbine generator gearbox, which takes micron-sized particles formed by drying and grinding layered silicate such as montmorillonite, kaolin and the like as a core component, and is prepared by a physical grinding or organic tin siloxanyl chemical modification process, when the additive is added in lubricating oil in an amount of 0.5-5wt%, a micro pit on the wear surface can be filled, a silicate protection layer is formed, an antioxidant and an extreme pressure antiwear agent are matched to realize the self-repairing function of wear, and four-ball machine tests show that the self-repairing additive can reduce the diameter