Preparation method of hollow carbon spheres with high stability and strong electrorheological efficiency

Abstract

The invention relates to a preparation method of hollow carbon spheres with high stability and strong electrorheological efficiency. The problem that the performance is affected due to easy sedimentation during use in the prior art is solved. Comprising the following steps: 1, carrying out a stirring reaction on an organic microsphere and a phenolic compound in a room temperature environment to obtain a copolymer solution, 2, respectively washing the copolymer solution with water and ethanol, carrying out suction filtration, and carrying out vacuum drying on the copolymer solution to obtain a core-shell microsphere, and 3, carrying out high-temperature calcination on the core-shell microsphere to obtain a core-shell composite material. And 4, dewatering the insulating oil, and uniformly mixing the hollow carbon spheres with the insulating oil to obtain the hollow carbon sphere-based electrorheological fluid. The hollow carbon spheres prepared by the invention effectively avoid the problems of high density and single preparation raw material of traditional electrorheological particles.

Description

Technical Field

[0001] The invention relates to a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency. Background Art

[0002] Electrorheological Fluid (ERF) is a type of stimulus-responsive "smart" soft material with reversibly adjustable rheological properties. In recent years, it has attracted extensive attention in the applications of smart actuators, tactile sensing devices, fluid transportation, and shock absorbers / isolators. Electrorheological fluid is mainly composed of electrorheological particles dispersed in insulating oil. Among them, electrorheological particles, as an important component of electrorheological fluid, are crucial to improving electrorheological performance.

[0003] The electrorheological particles reported so far often have a large density mismatch with the carrier fluid, which causes the electrorheological fluid to easily settle during use, affecting its performance.

[0004] Therefore, it is urgent to propose a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the electrorheological fluid formed by the conventional technology is easy to settle during use, which affects its performance. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0006] The technical solution of the present invention:

[0007] A method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency comprises the following steps:

[0008] Step 1: stirring the organic microspheres and the phenolic compound to react at room temperature, and obtaining a copolymer solution after the stirring reaction is completed;

[0009] Step 2: washing the copolymer solution with water and ethanol, respectively, and filtering, and then vacuum drying the copolymer solution to obtain core-shell microspheres;

[0010] Step 3: calcining and pyrolyzing the core-shell microspheres to obtain hollow carbon spheres;

[0011] Step 4: Heat the insulating oil and remove water, and then evenly mix the hollow carbon spheres with the insulating oil after keeping the temperature to obtain a hollow carbon sphere-based electrorheological fluid.

[0012] Preferably, the organic microspheres are one of polystyrene, polymethyl methacrylate, polylactic acid, polyethylene glycol-polylactic acid-glycolic acid, composite microspheres, and polyethylene glycol-b-polycaprolactone.

[0013] Preferably, the particle size of the organic microspheres is 100-1000 nm.

[0014] Preferably, the phenolic compound is one of dopamine, tannic acid and ellagic acid.

[0015] Preferably, the dosage of the phenolic compound is 0.5-4.0 g / L, the stirring rate is 500-800 rpm, and the reaction time is 6-48 h.

[0016] Preferably, the shell thickness of the core-shell microspheres is 10-50 nm.

[0017] Preferably, the calcination temperature is 350-550°C and the holding time is 2-6h.

[0018] Preferably, the particle size of the hollow carbon sphere is 100-1000 nm.

[0019] Preferably, the insulating oil is one of silicone oil, vegetable oil and mineral oil.

[0020] Preferably, the heating temperature is 100-120°C and the insulation time is 5-10h.

[0021] The present invention has the following beneficial effects:

[0022] The hollow carbon spheres prepared by the present invention effectively avoid the problems of high density and single raw materials of traditional electrorheological particles;

[0023] The present invention can demonstrate relatively excellent stability and effectively improve the electrorheological efficiency of the electrorheological fluid;

[0024] The particle size and shell thickness of the hollow carbon spheres prepared by the present invention are adjustable and have good biocompatibility, and the process is safe and simple with good reproducibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of hollow carbon spheres with different particle sizes;

[0026] Figure 2 a BET curve diagram of 850nm hollow carbon sphere, b pore size distribution diagram;

[0027] Figure 3 It is the distribution diagram of true density values ​​obtained from different test times;

[0028] Figure 4It is the electrorheological response performance of 850nm hollow carbon spheres, where the mass fraction is 6wt%, a shear rate-shear stress curve, b shear rate-shear viscosity curve;

[0029] Figure 5 This is a graph showing the relationship between the shear stress and the electric field intensity of the electrorheological fluid based on 850nm hollow carbon spheres. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0031] Specific implementation method 1: Combination Figure 1-Figure 5 The present embodiment is described. A method for preparing hollow carbon spheres with high stability and high electrorheological efficiency in the present embodiment comprises the following steps:

[0032] Step 1: stirring the organic microspheres and the phenolic compound to react at room temperature, and obtaining a copolymer solution after the stirring reaction is completed;

[0033] Step 2: washing the copolymer solution with water and ethanol, respectively, and filtering, and then vacuum drying the copolymer solution to obtain core-shell microspheres;

[0034] Step 3: calcining the core-shell microspheres and pyrolyzing them to obtain hollow carbon spheres;

[0035] Step 4: Heat the insulating oil and remove water, and then evenly mix the hollow carbon spheres with the insulating oil after keeping the temperature to obtain a hollow carbon sphere-based electrorheological fluid.

[0036] Specific implementation method 2: Combination Figure 1-Figure 5 The present embodiment is described. The present embodiment is a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency. The organic microspheres are one of polystyrene, polymethyl methacrylate, polylactic acid, polyethylene glycol-polylactic acid-hydroxyacetic acid, composite microspheres, and polyethylene glycol-b-polycaprolactone.

[0037] Specific implementation method three: Combination Figure 1-Figure 5 The present embodiment is described as a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency. The particle size of the organic microspheres is 100-1000nm, and they can maintain good dispersibility and stability in various solvents and media.

[0038] Specific implementation method four: Combination Figure 1-Figure 5The present embodiment is described. The present embodiment provides a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency. The phenolic compound is one of dopamine, tannic acid and ellagic acid.

[0039] Specific implementation method five: Combination Figure 1-Figure 5 This embodiment describes a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency. The dosage of phenolic compounds is 0.5-4.0 g / L, the stirring rate is 500-800 rpm, and the reaction time is 6-48 h. By optimizing these conditions, a chemical reaction process with high efficiency, high yield and high quality can be achieved.

[0040] Specific implementation method six: Combination Figure 1-Figure 5 The present embodiment is described. The present embodiment provides a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency. The shell thickness of the core-shell microspheres is 10-50nm. By precisely controlling the type and thickness of the shell material, precise regulation and optimization of the microsphere performance can be achieved.

[0041] Specific implementation method seven: Combination Figure 1-Figure 5 The present embodiment describes a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency. In step three, the calcination temperature is 350-550°C and the insulation time is 2-6h. By precisely controlling these parameters, a material product with excellent performance can be obtained.

[0042] Specific implementation method eight: Combination Figure 1-Figure 5 The present embodiment describes a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency. The particle size of the hollow carbon spheres is 100-1000nm, which is beneficial to improving the catalytic efficiency. In the field of energy storage, the appropriate particle size is beneficial to the transmission and storage of charges.

[0043] Specific implementation method nine: Combination Figure 1-Figure 5 The present embodiment is described as a method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency. The insulating oil is one of silicone oil, vegetable oil and mineral oil.

[0044] Specific implementation method ten: Combination Figure 1-Figure 5 The present embodiment is described as a method for preparing hollow carbon balls with high stability and strong electrorheological efficiency. In step 4, the heating temperature is 100-120°C and the insulation time is 5-10h. By precisely controlling these parameters, a material product with excellent performance can be obtained.

[0045] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency, characterized in that The steps include: Step 1: stirring the organic microspheres and the phenolic compound to react at room temperature, and obtaining a copolymer solution after the stirring reaction is completed; Step 2: washing the copolymer solution with water and ethanol, respectively, and filtering, and then vacuum drying the copolymer solution to obtain core-shell microspheres; Step 3: calcining the core-shell microspheres and pyrolyzing them to obtain hollow carbon spheres; Step 4: remove water from the insulating oil, keep it warm and then mix the hollow carbon balls with the insulating oil to obtain a hollow carbon ball-based electrorheological fluid.

2. A method for preparing hollow carbon spheres with high stability and high electrorheological efficiency according to claim 1, characterized in that: The organic microsphere is one of polystyrene, polymethyl methacrylate, polylactic acid, polyethylene glycol-polylactic acid-glycolic acid, composite microsphere, and polyethylene glycol-b-polycaprolactone.

3. The method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency according to claim 1, characterized in that: The particle size of the organic microspheres is 100-1000nm.

4. The method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency according to claim 1, characterized in that: Phenolic compounds are one of dopamine, tannic acid, and ellagic acid.

5. The method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency according to claim 1, characterized in that: The dosage of the phenolic compound is 0.5-4.0 g / L, the stirring rate is 500-800 rpm, and the reaction time is 6-48 h.

6. The method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency according to claim 1, characterized in that: The shell thickness of the core-shell microspheres is 10-50 nm.

7. The method for preparing hollow carbon spheres with high stability and high electrorheological efficiency according to claim 1, characterized in that: In step 3, the calcination temperature is 350-550° C. and the holding time is 2-6 hours.

8. The method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency according to claim 1, characterized in that: The particle size of the hollow carbon spheres is 100-1000nm.

9. The method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency according to claim 1, characterized in that: Insulating oil is one of silicone oil, vegetable oil and mineral oil.

10. The method for preparing hollow carbon spheres with high stability and strong electrorheological efficiency according to claim 1, characterized in that: In step 4, the heating temperature is 100-120°C and the insulation time is 5-10h.

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