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Organic-inorganic core-shell structure self-lubricating composite material and preparation method thereof

A composite material, core-shell structure technology, applied in lubricating compositions, petroleum industry, etc., can solve the problems of restricting the use range of composite materials, poor thermal stability, etc.

Active Publication Date: 2020-12-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal stability of PMMA or PS is poor, which severely restricts the application range of composite materials.

Method used

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  • Organic-inorganic core-shell structure self-lubricating composite material and preparation method thereof
  • Organic-inorganic core-shell structure self-lubricating composite material and preparation method thereof
  • Organic-inorganic core-shell structure self-lubricating composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of core-shell structure particles: Add 10mL of concentrated PTFE dispersion (60wt.%) to 100mL of deionized water (PTFE particle size is about 300nm), add 10mL of zirconium butoxide solution, and then dropwise in the mixed solution Add urea solution, ultrasonically disperse for 10 minutes, transfer to a 200mL hydrothermal reactor, react at 110°C for 12 hours, take out the reactor after natural cooling, and obtain PTFE@ZrO through suction filtration, repeated washing and drying. 2 Core-shell structure product. The product was analyzed by TEM, as figure 2 As shown, the product is an obvious core-shell structure, indicating that PTFE is successfully coated. (2) Forming of core-shell composite materials: take a certain amount of dry PTFE@ZrO 2 The powder was molded under a pressure of 20MPa, sintered at 290°C for 5h, annealed at 100°C for 4h, and the organic-inorganic core-shell structure composite material was obtained after natural cooling. The AFM tapp...

Embodiment 2

[0030] (1) Preparation of core-shell structure particles: disperse PTFE powder (5g) with a particle size of about 100nm into 100mL aqueous surfactant system, add 10mL zirconium butoxide and aluminum acetylacetonate solution, and then add Hexamethylenetetramine solution was ultrasonically dispersed for 10 minutes and then transferred to a hydrothermal reactor with a volume of 200mL, reacted at 120°C for 12 hours, took out the reactor after natural cooling, and obtained PTFE@MgO by suction filtration, repeated washing and drying / ZrO 2 Core-shell structure product. (2) Core-shell structure composite material molding: take a certain amount of dry PTFE@MgO / ZrO 2 The powder was molded under a pressure of 30MPa, sintered at 390°C for 2 hours, annealed at 120°C for 2 hours, and the organic-inorganic core-shell structure composite material was obtained after natural cooling.

Embodiment 3

[0032] (1) Preparation of core-shell structure particles: Disperse PTFE powder (3g) with a particle size of about 100nm into 100mL surfactant aqueous solution system, add 5mL tetraethyl orthosilicate, 2mL ammonia water, 5mL ethanol, at room temperature (25 ℃) stirred and reacted for 10 hours, and obtained PTFE@SiO by suction filtration, repeated washing and drying 2 Core-shell structure product. (2) Molding of core-shell structure composite materials: Put the core-shell structure particle powder into a mold made of graphite, and apply a specific sintering power supply and pressing pressure to the sintering powder by using the upper and lower die punches and electrified electrodes to obtain organic and inorganic materials. Core-shell composites. Temperature: 340°C, pressure: 10MPa, time: 5h.

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Abstract

The invention belongs to the field of self-lubricating composite materials, and particularly relates to an organic-inorganic core-shell structure composite material and a preparation method thereof. The composite material is composed of core-shell structure micro-nano particles, the core material of the micro-nano particles is PTFE, and the shell material of the micro-nano particles is an inorganic oxide. The method is simple in process and easy to operate, in the prepared composite material, an inorganic framework provides strength and rigidity, an organic phase PTFE provides toughness and flexibility, the two phases are compounded in a micro-nano scale and a core-shell structure has a special wrapping effect, so that the problems of non-uniform dispersion of a reinforced phase and weak two-phase interface acting force of a traditional PTFE composite material can be effectively solved, and the composite material has a wide application prospect in the field of self-lubricating materials.

Description

technical field [0001] The invention belongs to the field of self-lubricating composite materials, in particular to an organic-inorganic core-shell structure composite material and a preparation method thereof. Background technique [0002] Core-shell particles not only have the advantages of both core and shell components, but also the formation of the core-shell structure and the diversity of the core-shell interface reflect special properties that are completely different from simple blends or copolymers. , Scale to achieve regulation, core-shell structure materials have the characteristics of many types of composition, various shapes, and synergistic effects between components. Core-shell nanoparticles play an important role in improving the mechanical properties of engineering materials. Incorporating rigid nanoparticles into polymer matrices can improve their strength and toughness, as nanoparticles can withstand large plastic deformations under external forces. Due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C10M169/04C10N30/06C08L27/18
CPCC08J3/12C10M169/04C10M2201/062C10M2213/0623C08J2327/18
Inventor 张琳解国新任一龙雒建斌
Owner TSINGHUA UNIV
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