CN112552987A - Preparation method of ultra-stable silicone oil-based magnetorheological fluid - Google Patents
Preparation method of ultra-stable silicone oil-based magnetorheological fluid Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
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- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
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- F16F9/369—Sealings for elements other than pistons or piston rods, e.g. valves
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- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
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- F16F9/535—Magnetorheological [MR] fluid dampers
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Abstract
The invention provides a preparation method of an ultra-stable silicone oil-based magnetorheological fluid, which comprises the steps of mixing, contacting and compounding magnetic sensitive particles and an additive in a carrier liquid to prepare the oil-based magnetorheological fluid in one step; the magnetosensitive particles used in the present invention are Fe of a specified particle size304Powder or Fe, Co and Ni alloy particle powder, silicone oil as carrier liquid, and magnetic sensitive particles as well as friction reducing antiwear agent, antioxidant, thixotropic agent, antifreezing agent and surfactant as additiveIn the silicone oil carrying liquid, the oil-based magnetorheological fluid is prepared in one step by setting the reaction temperature and time. According to the invention, the problems that complicated steps are required to be carried out and complicated reaction conditions are met in the preparation process of the oil-based magnetorheological fluid in the prior art can be solved, and the oil-based magnetorheological fluid can be prepared in one step.
Description
Technical Field
The invention relates to the technical field of intelligent materials, in particular to a preparation method of an ultra-stable silicon oil-based magnetorheological fluid.
Background
Magnetorheological fluid, a novel intelligent material with both magnetism of magnetic solid matter and liquidity of liquid, can carry out controllable, reversible and continuous rapid transition between properties of liquid and solid, and is widely applied to the fields of medicine, aerospace, large civil engineering, machining, automobile engineering, electromechanical integration and the like.
The oil magnetic rheological liquid consists of three parts, including magnetic particle, carrier liquid and additive. The magnetic particles generally used are ferromagnetic substances, ferrimagnetic substances, other soft magnetic substances, and the like. The oil-based magnetorheological fluid carrier liquid generally comprises silicone oil, olive oil, silicone oil and the like. The corresponding carrier liquid is selected according to different uses of the magnetic liquid. The additive plays an important role in improving the performance of the magnetorheological fluid and mainly comprises a stabilizer, an antioxidant and the like.
The known oil-based magnetorheological fluid generally uses silicon oil as a carrier fluid, and the invention discloses ' an oxidation-resistant dimethyl silicon oil-based magnetic fluid and a preparation method thereof ' (publication number: CN101599335A) ' a stable silicon oil-based magnetorheological fluid and a preparation method thereof ' (publication number: CN1959872A) ' an ethyl silicon oil-based magnetic fluid and a preparation method thereof ' (publication number: CN101225233A) '.
Disclosure of Invention
The invention provides a preparation method of an ultra-stable silicone oil-based magnetorheological fluid, aiming at avoiding complicated reaction conditions and steps in a preparation process and preparing the oil-based magnetorheological fluid in one step.
The invention is realized by the following steps: the invention provides a preparation method of an ultra-stable silicone oil-based magnetorheological fluid, which comprises the following steps:
adding the magnetic sensitive particles and the additive into the carrier liquid, stirring and mixing, and carrying out composite reaction to prepare the oil-based magnetorheological fluid in one step;
wherein, the magnetic sensitive particles, the carrier liquid and the additive are respectively as follows according to the mass portion ratio:
magnetic sensitive particles: 30-35 parts; liquid carrying: 50-70 parts; additive: 1-10 parts;
wherein the magnetic sensitive particles are Fe 304Powder or alloy particle powder of Fe, Co and Ni, the average grain diameter of the magnetic sensitive particles is 1-10 microns;
the additive comprises a friction reducing antiwear agent, an antioxidant, a thixotropic agent, an antifreezing agent and a surfactant;
the carrier liquid is silicone oil;
wherein the temperature for carrying out the composite reaction after stirring and mixing is 15-85 ℃, and the reaction time is 15-20 hours.
Wherein, based on the total mass of the magnetorheological fluid, the antifriction antiwear agent accounts for 0.02-1%;
based on the total mass of the magnetorheological fluid, the thixotropic agent accounts for 0.05-2%;
the antioxidant accounts for 0.05-1% of the total mass of the magnetorheological fluid;
the antifreezing agent accounts for 2-5% of the total mass of the magnetorheological fluid;
the surfactant accounts for 0.1-3% of the total mass of the magnetorheological fluid.
Wherein the antiwear additive is diamond or cerium dioxide.
Wherein the thixotropic agent is at least one of diatomite, nano silicon dioxide, nano lithium magnesium silicate, bentonite and organic bentonite.
Wherein the antioxidant is at least one of organic molybdenum compound, organic phosphorus compound and sodium benzoate.
Wherein the surfactant is at least one of propylene carbonate, stearic acid, a coupling agent, alkylamine phosphate and alkoxy thiophosphate.
Wherein the antifreezing agent is ethylene glycol.
Wherein the average particle size of the magnetic sensitive particles is optimally selected to be 1-5 microns.
In addition, the invention provides a magnetorheological fluid damping device which comprises a damper cylinder and a piston rod, wherein the top end of the damper cylinder is provided with a plurality of sealing shaft seals, the bottom end of the damper cylinder is provided with a liquid storage tank, the surface of the liquid storage tank is provided with a partition plate, the outer side of the damper cylinder is provided with a reinforcing heat dissipation interlayer, the surface of the reinforcing heat dissipation interlayer is provided with a plurality of heat dissipation pipes, the top end of the piston rod is provided with a plurality of current sources, the bottom end of the piston rod is provided with an iron core, a coil is arranged in the iron core, one side of the iron core is provided with a piston, and magnetorheological fluid is arranged in the damper cylinder; the magnetorheological fluid arranged in the damper cylinder is the silicone oil-based magnetorheological fluid in the technical scheme.
Compared with the prior art, the invention has the beneficial effects that: the invention discloses a preparation method of an ultra-stable silicone oil-based magnetorheological fluid, which comprises the steps of mixing, contacting and compounding magnetic sensitive particles and an additive in a carrier liquid to prepare the oil-based magnetorheological fluid in one step; the magnetosensitive particles used in the present invention are Fe of a specified particle size 304Powder or alloy particle powder of Fe, Co and Ni, the carrier fluid is silicone oil, additives and magnetic sensitive particles which comprise an anti-friction and anti-wear agent, an antioxidant, a thixotropic agent and a surfactant are added into the silicone oil of the carrier fluid, and the oil-based magnetorheological fluid is prepared in one step by setting the reaction temperature and time. According to the invention, the problems that complicated steps are required to be carried out and complicated reaction conditions are met in the preparation process of the oil-based magnetorheological fluid in the prior art can be solved, and the oil-based magnetorheological fluid can be prepared in one step.
Drawings
FIG. 1 is a schematic diagram showing the results of performance tests conducted on the magnetorheological fluid in example 4 by measuring the zero-field viscosity of the magnetorheological fluid as a function of shear rate according to the preparation method of the ultra-stable silicone-oil-based magnetorheological fluid provided by the invention;
FIG. 2 is a schematic diagram showing the results of performance tests conducted on the magnetorheological fluid in example 4 by measuring the relationship between the magneto-induced shear stress of the magnetorheological fluid and the variation of the magnetic field strength according to the preparation method of the ultra-stable silicone oil-based magnetorheological fluid provided by the invention;
fig. 3 is a schematic diagram showing the results of a sedimentation stability test performed on the water-based magnetorheological fluids prepared in the four examples in the method for preparing the ultra-stable silicone oil-based magnetorheological fluid provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The invention provides a preparation method of an ultra-stable silicone oil-based magnetorheological fluid, which comprises the following steps:
adding the magnetic sensitive particles and the additive into the carrier liquid, stirring and mixing, and carrying out composite reaction to prepare the oil-based magnetorheological fluid in one step;
wherein, the magnetic sensitive particles, the carrier liquid and the additive are respectively as follows according to the mass portion ratio:
magnetic sensitive particles: 30-35 parts; liquid carrying: 50-70 parts; additive: 1-10 parts;
wherein the magnetic sensitive particles are Fe 304Powder or alloy particle powder of Fe, Co and Ni, the average grain diameter of the magnetic sensitive particles is 1-10 microns;
the additive comprises a friction reducing antiwear agent, an antioxidant, a thixotropic agent, an antifreezing agent and a surfactant;
the carrier liquid is silicone oil;
wherein the temperature for carrying out the composite reaction after stirring and mixing is 15-85 ℃, and the reaction time is 15-20 hours.
Wherein, based on the total mass of the magnetorheological fluid, the antifriction antiwear agent accounts for 0.02-1%;
based on the total mass of the magnetorheological fluid, the thixotropic agent accounts for 0.05-2%;
the antioxidant accounts for 0.05-1% of the total mass of the magnetorheological fluid;
the antifreezing agent accounts for 2-5% of the total mass of the magnetorheological fluid;
the surfactant accounts for 0.1-3% of the total mass of the magnetorheological fluid.
Wherein the antiwear additive is diamond or cerium dioxide.
Wherein the thixotropic agent is at least one of diatomite, nano silicon dioxide, nano lithium magnesium silicate, bentonite and organic bentonite.
Wherein the antioxidant is at least one of organic molybdenum compound, organic phosphorus compound and sodium benzoate.
Wherein the antifreezing agent is ethylene glycol.
Wherein the surfactant is at least one of propylene carbonate, stearic acid, a coupling agent, alkylamine phosphate and alkoxy thiophosphate.
Example 1
Adding 3.0g (0.5%) of molybdenum disulfide (antifriction antiwear agent), 3.0g (0.5%) of organic phosphorus compound (antioxidant), 6g (1%) of organic bentonite (thixotropic agent), 27g (4.5%) of ethylene glycol and 3.0g (0.5%) of alkoxy thiophosphate (surfactant) into 81g (13.5%) of low-viscosity silicone oil (PA0170), stirring, and adding 504g of Fe 304Adding the powder into silicone oil, uniformly stirring at a high speed of 1000rpm to obtain a suspension, and carrying out composite reaction on the suspension at the temperature of 70 ℃ for 2 hours to prepare the oil-based magnetorheological fluid.
The magnetorheological fluid prepared in the embodiment is placed in a measuring cylinder of 10ml, placed at room temperature for standing and sedimentation, and the sedimentation rate is observed after 3 months. The sedimentation rate is determined by taking the ratio of the volume of the supernatant to the total volume of the sample after standing and sedimentation for 3 months, and multiplying the ratio by one hundred percent to obtain the sedimentation rate.
Compared with other existing preparation methods, the sedimentation rate of the oil-based magnetorheological fluid provided by the invention can be kept higher on the premise of no need of complicated preparation steps and complicated reaction conditions.
Example 2
Adding 4.2g (0.7%) of molybdenum disulfide as an antifriction antiwear agent, graphite (1:1), 6g (1%) of organic bentonite as a thixotropic agent, 15g (2.5%) of ethylene glycol and 4.8g (0.8%) of alkoxy thiophosphate as a surfactant into 45g (7.5%) of low-viscosity silicone oil (PA0168) for stirring, adding 537g of Fe, Co and Ni alloy particle powder into the silicone oil, uniformly stirring at a high speed of 1000rpm to obtain a suspension, and carrying out composite reaction on the suspension at the temperature of 70 ℃ for 2 hours to prepare the oil-based magnetorheological fluid.
The magnetorheological fluid prepared in the embodiment is placed in a measuring cylinder of 10ml, placed at room temperature for standing and sedimentation, and the sedimentation rate is observed after 3 months. The sedimentation rate is determined by taking the ratio of the volume of the supernatant to the total volume of the sample after standing and sedimentation for 3 months, and multiplying the ratio by one hundred percent to obtain the sedimentation rate.
Compared with other existing preparation methods, the sedimentation rate of the oil-based magnetorheological fluid provided by the invention can be kept higher on the premise of no need of complicated preparation steps and complicated reaction conditions.
Example 3
4.2g (0.7%) of the antifriction antiwear agent diamond and graphite (1:1), 3.6g (0.6%) of antioxidant organic molybdenum compound, 5.4g (0.9%) of thixotropic agent organic bentonite, 14g (2.33%) of ethylene glycol and 4.8g (0.8%) of surfactant alkoxy thiophosphate are added into 42g (7%) of low-viscosity silicone oil (PA0170) to be stirred, 504g of Fe 304Adding the powder and Fe, Co and Ni alloy particle powder into silicone oil according to the mass ratio (53: 47), uniformly stirring at a high speed of 1000rpm to obtain a suspension, and carrying out composite reaction on the suspension at the temperature of 70 ℃ for 2 hours to prepare the oil-based magnetorheological fluid.
The magnetorheological fluid prepared in the embodiment is placed in a measuring cylinder of 10ml, placed at room temperature for standing and sedimentation, and the sedimentation rate is observed after 3 months. The sedimentation rate is determined by taking the ratio of the volume of the supernatant to the total volume of the sample after standing and sedimentation for 3 months, and multiplying the ratio by one hundred percent to obtain the sedimentation rate.
Example 4
4.2g (0.7%) of the antifriction antiwear agent diamond and graphite (1:1), 3.6g (0.6%) of an antioxidant organic molybdenum compound, 5.4g (0.9%) of thixotropic agent nano-silica, 14g (2.33%) of ethylene glycol and 4.8g (0.8%) of surfactant alkoxy thiophosphate are added into 42g (7%) of low-viscosity silicone oil (PA0170) and stirred, and 498g of Fe 304Adding the powder and Fe, Co and Ni alloy particle powder into silicone oil according to the mass ratio (53: 47), uniformly stirring at a high speed of 1000rpm to obtain a suspension, and carrying out composite reaction on the suspension at the temperature of 70 ℃ for 2 hours to prepare the oil-based magnetorheological fluid.
The magnetorheological fluid prepared in the embodiment is placed in a measuring cylinder of 10ml, placed at room temperature for standing and sedimentation, and the sedimentation rate is observed after 3 months. The sedimentation rate is determined by taking the ratio of the volume of the supernatant to the total volume of the sample after standing and sedimentation for 3 months, and multiplying the ratio by one hundred percent to obtain the sedimentation rate.
Compared with other existing preparation methods, the sedimentation rate of the oil-based magnetorheological fluid provided by the invention can be kept higher on the premise of no need of complicated preparation steps and complicated reaction conditions.
The ARES 2000 advanced extended rheometer of the American TA company is adopted to measure the variation of the zero-field viscosity of the oil-based magnetorheological fluid prepared in the embodiment 4 of the invention along with the shear rate (0.1-400 s)-1) See fig. 1. As can be seen from fig. 1, the viscosity of the oil-based magnetorheological fluid tends to decrease as the shear rate increases.
The relationship curve of the magneto-induced shear stress of the oil-based magnetorheological fluid prepared in the embodiment 4 of the invention along with the change of the magnetic field strength (0-4000 Gs) is measured by adopting an ARES 2000 advanced extended rheometer of the American TA company, and the relationship curve is shown in figure 2. As can be seen from fig. 2, the magnetic shear stress of the oil-based magnetorheological fluid tends to increase with increasing magnetic field strength.
Fig. 3 is a graph showing the volume fraction of the carrier liquid precipitation amount in the total amount after the oil-based magnetorheological fluid prepared in example 4 is settled by standing and changing with time. As can be seen from the figure, the change of the carrier liquid precipitation amount after standing for three days is steep, and the carrier liquid precipitation amount after standing for 9 days is basically kept unchanged.
By comparing the preparation method of the oil-based magnetorheological fluid and the oil-based magnetorheological fluid in the prior art, the preparation method disclosed by the invention has the advantages that the selected magnetic-sensitive particles and additives are added into the silicone oil serving as the carrier liquid in advance, high-speed stirring and composite reaction are carried out, the sedimentation rate of the prepared oil-based magnetorheological fluid after standing for three months is equivalent to that of the oil-based magnetorheological fluid prepared by the prior art under the conditions of preset reaction temperature and reaction time, but the reaction conditions are prepared in one step in the reaction process, so that the complicated reaction steps and complicated reaction conditions in the prior art are reduced on the premise of ensuring the quality, and the manufacturing time can be shortened.
In addition, the invention provides a magnetorheological fluid damping device which comprises a damper cylinder and a piston rod, wherein the top end of the damper cylinder is provided with a plurality of sealing shaft seals, the bottom end of the damper cylinder is provided with a liquid storage tank, the surface of the liquid storage tank is provided with a partition plate, the outer side of the damper cylinder is provided with a reinforcing heat dissipation interlayer, the surface of the reinforcing heat dissipation interlayer is provided with a plurality of heat dissipation pipes, the top end of the piston rod is provided with a plurality of current sources, the bottom end of the piston rod is provided with an iron core, a coil is arranged in the iron core, one side of the iron core is provided with a piston, and magnetorheological fluid is arranged in the damper cylinder; the magnetorheological fluid arranged in the damper cylinder is the silicone oil-based magnetorheological fluid in the technical scheme.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A preparation method of an ultra-stable silicone oil-based magnetorheological fluid is characterized by comprising the following steps:
adding the magnetic sensitive particles and the additive into the carrier liquid, stirring and mixing, and carrying out composite reaction to prepare the oil-based magnetorheological fluid in one step;
wherein, the magnetic sensitive particles, the carrier liquid and the additive are respectively as follows according to the mass portion ratio:
magnetic sensitive particles: 30-35 parts; liquid carrying: 50-70 parts; additive: 1-10 parts;
wherein the magnetic sensitive particles are Fe304Powder or alloy particle powder of Fe, Co and Ni, the average grain diameter of the magnetic sensitive particles is 1-10 microns;
the additive comprises a friction reducing antiwear agent, an antioxidant, a thixotropic agent, an antifreezing agent and a surfactant;
the carrier liquid is silicone oil;
wherein the temperature for carrying out the composite reaction after stirring and mixing is 15-85 ℃, and the reaction time is 15-20 hours.
2. The preparation method of the ultra-stable silicone oil-based magnetorheological fluid according to claim 1, wherein the friction-reducing antiwear agent accounts for 0.02 to 1 percent of the total mass of the magnetorheological fluid;
based on the total mass of the magnetorheological fluid, the thixotropic agent accounts for 0.05-2%;
the antioxidant accounts for 0.05-1% of the total mass of the magnetorheological fluid;
the antifreezing agent accounts for 2-5% of the total mass of the magnetorheological fluid;
the surfactant accounts for 0.1-3% of the total mass of the magnetorheological fluid.
3. The method for preparing the ultra-stable silicone oil-based magnetorheological fluid as recited in claim 1, wherein the anti-wear additive is diamond or cerium dioxide.
4. The preparation method of the ultra-stable silicone oil-based magnetorheological fluid according to claim 1, wherein the thixotropic agent is at least one of diatomite, nano silicon dioxide, nano lithium magnesium silicate, bentonite and organic bentonite.
5. The preparation method of the ultra-stable silicone oil-based magnetorheological fluid as claimed in claim 1, wherein the antioxidant is at least one of organic molybdenum compound, organic phosphorus compound and sodium benzoate.
6. The method for preparing the ultra-stable silicone oil-based magnetorheological fluid as recited in claim 1, wherein the surfactant is at least one of propylene carbonate, stearic acid, a coupling agent, alkylamine phosphate, and alkoxythiophosphate.
7. The method for preparing the ultra-stable silicone oil-based magnetorheological fluid as recited in claim 1, wherein the anti-freezing agent is ethylene glycol.
8. The method for preparing the ultra-stable silicone oil-based magnetorheological fluid as claimed in claim 1, wherein the average particle size of the magnetosensitive particles is optimally selected to be 1 to 5 microns.
9. A magnetorheological fluid damping device comprises a damper cylinder and a piston rod, wherein the top end of the damper cylinder is provided with a plurality of sealing shaft seals, the bottom end of the damper cylinder is provided with a liquid storage tank, the surface of the liquid storage tank is provided with a partition plate, the outer side of the damper cylinder is provided with a reinforcing heat dissipation interlayer, the surface of the reinforcing heat dissipation interlayer is provided with a plurality of heat dissipation pipes, the top end of the piston rod is provided with a plurality of current sources, the bottom end of the piston rod is provided with an iron core, a coil is arranged inside the iron core, one side of the iron core is provided with a piston, and magnetorheological fluid is arranged inside the damper cylinder; the magnetorheological fluid is characterized in that the magnetorheological fluid arranged in the damper cylinder is the silicone oil-based magnetorheological fluid according to any one of claims 1 to 5.
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