CN1232621C - Magnitic rheological liquid of guargum - Google Patents
Magnitic rheological liquid of guargum Download PDFInfo
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- CN1232621C CN1232621C CN 200410016427 CN200410016427A CN1232621C CN 1232621 C CN1232621 C CN 1232621C CN 200410016427 CN200410016427 CN 200410016427 CN 200410016427 A CN200410016427 A CN 200410016427A CN 1232621 C CN1232621 C CN 1232621C
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Abstract
The present invention relates to magnetic rheological liquid of guar gum, which belongs to the technical field of environmental protection. The magnetic rheological liquid of the guar gum comprises the ingredients of (by weight percentage) 35 to 94% of magnetic particle, 5 to 60% of dispersion medium, 0.1 to 10% of guar gum and 0 to 10% of other additive. The dispersion medium is organic liquid with the characteristics of nonpolarity, low volatilization and water content lower than 1%. other additives comprise one of or several kinds of the surfactants of oleic acid, polyethylene glycol and a silane coupling agent, and one of the inorganic thixotropy additives of nanometer-size or micron-size inorganic bentonite, silicon dioxide, alumina powder and alumina fibers or a mixture of several kinds of the inorganic thixotropy additives. The present invention solves the problems of bad environmental compatibility in the existing magnetic rheological liquid, and the problem is caused by the addition of compounds, such as organic benzotriazole thixotropic agents, surfactants, etc., which do harm to environment; the present invention further expands the application range of guar gum resources.
Description
Technical field
What the present invention relates to is a kind of magnetic flow liquid that is used for environmental protection, particularly a kind of guar gum magnetic flow liquid.Belong to the chemical material field.
Background technology
Magnetic flow liquid generally is made up of dispersion medium, magnetic particle and additive.It is a kind of functional magnetic fluid, and considerable change can take place for this fluidic viscosity and rheological property under the action of a magnetic field.This function of magnetic flow liquid provides its huge applications potentiality in various dampings, vibration damping field.Compare with electrorheological fluid, magnetic flow liquid more is easy to generate strong surrender effect, but because the density of the magnetic particle in the magnetic flow liquid far above the density of dispersion medium, therefore, leaves standstill magnetic particle tangible sedimentation phenomenon of meeting appearance in dispersion medium in the process for a long time.The sedimentation stability of magnetic flow liquid is the key factor that influences its Industry Promotion.
In order to address this problem, people have adopted several different methods.As adopt tensio-active agents such as metallic soap class, stearic acid promoting agent or suspension agent that amphipathic processing is carried out on the magnetic particle surface, but can influence the temperature stability of magnetic flow liquid, and can not solve the problem that hardens after the particle precipitation; Adopt kinds of surface promoting agents such as inorganic thixotropic agent and oleic acid, polyoxyethylene glycol, silane coupling agent, carboxylic acid organic amine salt to be used; The employing hydrogen bond thixotropic agent that has, the metal hydride of polymer modification, perhaps their mixture is as the sedimentation of particle in dispersion medium that deperm of the thixotropic additive of system; Also has the settlement stability agent of some products employing organic sulfur-containings or phosphorated compound in addition as magnetic flow liquid.But in general, most of settlement stability agent can not improve the thixotropy performance of magnetic flow liquid simultaneously, and the additive that is adopted all is the Chemicals of organic synthesis, or toxic or cost an arm and a leg, and can bring harm to environment after magnetic flow liquid is discarded.
Find by literature search, Jiang Wanquan etc. deliver " Prepared by Ball Milling and magnetic rheology effect thereof that micron order superpolymer embedding shaped metal iron meets particle " on " Acta PhySico-Chimica Sinica " the 14th volume the 5th phase 543-547 page or leaf, this article is introduced: adopting ball milled is that the iron granule surface of micro-meter scale coats polymers such as polystyrene, polymethylmethacrylate in granularity, in the hope of obtaining the good magnetic flow liquid of sedimentation stability.This technology is compared with other technologies, because the size of magneticmetal particulate that adopts or metal oxide microparticle is unrestricted, it is big to have a magnetic response, and the preparation method is simple.But result of study shows the high molecular consumption of needs and can form complete coating layer more than 30% (weight percent), and blocked up coating layer causes the magnetic rheology effect of the magnetic flow liquid that coatedparticles is made into still lower.
Summary of the invention
The objective of the invention is to overcome the existing magnetic flow liquid deficiency of (or claiming magnetic rheological body), a kind of guar gum magnetic flow liquid is provided.On the basis of existing technology, the present invention consider the high molecular film forming properties that adopts and polymer and by particles coated associativity, and whether the high molecular structure that adopts helps forming network to slow down the ability of particle precipitation at the external phase fluid of magnetic flow liquid, adopt the guar-bean rubber powder as settlement stability agent and thixotropy additive, thereby obtain that Environmental compatibility is good, non-environmental-pollution, sedimentation stability and the good magnetic flow liquid of thixotropism.Solve present magnetic flow liquid because be added with the not good problem of Environmental compatibility that environmentally harmful compounds such as machine oligomer thixotropic agent, tensio-active agent cause.
The present invention is achieved by the following scheme, and each component and weight percent thereof that the present invention comprises are: magnetic particle: 35-94%, dispersion medium: 5-60%, guar gum: 0.1-10%, other additives: 0-10%.
Described magnetic particle is any solid particulate with magnetorheological performance, particularly has paramagnetism, superparamagnetism, ferromagnetic particle.The present invention preferentially selects carbonyl iron dust for use.The size range of powder is 0.1-100 μ m (being preferably 1-10 μ m).The preferred weight percentage composition of magnetic particle in magnetic flow liquid is 45-80%.
Described dispersion medium is nonpolar, low volatilization, the organic liquid of water content not, as one or more the mixture in various silicone oil, mineral oil, hydraulic efficiency oil, two lipid organic liquids or the like.The present invention preferentially selects silicone oil for use.The viscosity at ambient temperature of silicone oil is 10-500mPa.S (being preferably 10mPa.S).The weight percent content of dispersion medium in magnetic flow liquid is preferably 15-50%.
Described guar-bean rubber powder is white or faint yellow powder, and the particle diameter of powder is preferably 5-20 μ m at 0.01-1000 μ m.Addition is preferably the 0.5-2% weight percent.
The existence form of guar gum in magnetic flow liquid is independent powder, or be coated on the magnetic particle surface, the powder that the guar gum that is adopted is directly obtained by natural guar-bean direct physical processing and preparing, or pass through the various guar derivatives that chemical modification obtains.
The mixture of one or more in the various tensio-active agents such as described other additive-package oil scraper acid, polyoxyethylene glycol, silane coupling agent, and one or more the mixture in the inorganic thixotropy additive such as nanometer or micron order inorganic bentonite, silicon-dioxide, alumina powder jointed, sapphire whisker.The present invention can add a small amount of other additives as required in system, also can not add.The consumption of additive is preferably the 0.5-2% weight percent.
The basic preparation method of magnetic flow liquid of the present invention is as follows: dispersion medium, guar gum, other additive elder generation machineries are mixed, keeping in this liquid form mixt, adding magnetic particle gradually under the whipped state then, fully shift in the ball grinder after the dispersed with stirring, add abrading-ball ball milling certain hour, promptly prepare magnetic flow liquid.
Compared with prior art, system of the present invention is simple, can only be made up of magnetic particle, dispersion medium and guar gum; The employing natural plant is an additive, and Environmental compatibility is good; Preparation technology is simple, can adopt a ball milling method to prepare; High comprehensive performance, null field viscosity 0.1-0.5Pa.S, 630mT magnetic field down cut stress is 5-60kPa, rate of descent is 5-20%, does not have obviously to harden.
Embodiment
Content in conjunction with the inventive method further provides following examples:
Embodiment one:
Each component and weight percent thereof in the stable magnetic flow liquid of guar gum are: magnetic particle 35%, dispersion medium 201 type dimethyl silicone oils (viscosity 10mPa.S) 60%, guar-bean rubber powder 0.1%, white carbon black 4.9%.Dimethyl silicone oil and guar gum mechanical stirring were mixed 1 hour, keeping in this liquid form mixt, adding magnetic particle gradually under the whipped state then, adding back continuation stirring shifts in the ball grinder after 2 hours, three kinds of Stainless Steel Balls that the adding diameter is respectively 5mm, 15mm, 20mm carry out ball-milling processing, the ball milling time is 12 hours, promptly prepares magnetic flow liquid.The room temperature null field viscosity of this magnetic flow liquid is 0.1Pa.S, and 630mT magnetic field down cut stress is 3kPa, leaves standstill that rate of descent is 20% after three months, is easy to after the sedimentation separate.
Embodiment two:
Each component and weight percent thereof in the stable magnetic flow liquid of guar gum are: magnetic particle 94%, dispersion medium 201 type dimethyl silicone oils (viscosity 10mPa.S) 5%, guar-bean rubber powder 1%.Dimethyl silicone oil and guar gum mechanical stirring were mixed 1 hour, keeping in this liquid form mixt, adding magnetic particle gradually under the whipped state then, adding back continuation stirring shifts in the ball grinder after 2 hours, three kinds of Stainless Steel Balls that the adding diameter is respectively 5mm, 15mm, 20mm carry out ball-milling processing, the ball milling time is 24 hours, promptly prepares magnetic flow liquid.The room temperature null field viscosity of this magnetic flow liquid is 0.8Pa.S, and 630mT magnetic field down cut stress is 80kPa, leaves standstill that rate of descent is 2% after three months, is easy to after the sedimentation separate.
Embodiment three:
Each component and weight percent thereof in the stable magnetic flow liquid of guar gum are: magnetic particle 64.5%, dispersion medium 201 type dimethyl silicone oils (viscosity 10mPa.S) 32.5%, guar-bean rubber powder 3.0%.Dimethyl silicone oil and guar gum mechanical stirring were mixed 1 hour, keeping in this liquid form mixt, adding magnetic particle gradually under the whipped state then, adding back continuation stirring shifts in the ball grinder after 2 hours, three kinds of Stainless Steel Balls that the adding diameter is respectively 5mm, 15mm, 20mm carry out ball-milling processing, the ball milling time is 24 hours, promptly prepares magnetic flow liquid.The room temperature null field viscosity of this magnetic flow liquid is 0.18mPa.S, and magnetic field down cut stress is 30kPa, leaves standstill that rate of descent is 12% after three months, is easy to after the sedimentation separate.
Embodiment four:
Each component and weight percent thereof in the stable magnetic flow liquid of guar gum are: magnetic particle 50.0%, dispersion medium 201 type dimethyl silicone oils (viscosity 10mPa.S) 35.0%, guar-bean rubber powder 10.0%, white carbon black 5.0%.Dimethyl silicone oil and guar gum mechanical stirring were mixed 1 hour, keeping in this liquid form mixt, adding magnetic particle gradually under the whipped state then, adding back continuation stirring shifts in the ball grinder after 2 hours, three kinds of Stainless Steel Balls that the adding diameter is respectively 5mm, 15mm, 20mm carry out ball-milling processing, the ball milling time is 24 hours, promptly prepares magnetic flow liquid.The room temperature null field viscosity of this magnetic flow liquid is 0.25mPa.S, and magnetic field down cut stress is 22kPa, leaves standstill that rate of descent is 8% after three months, and is easy to after the sedimentation separate.
Embodiment five:
Each component and weight percent thereof in the stable magnetic flow liquid of guar gum are: magnetic particle 60.0%, dispersion medium 201 type dimethyl silicone oils (viscosity 10mPa.S) 25.0%, guar-bean rubber powder 5.0%, alumina powder jointed 10.0%.Dimethyl silicone oil and guar gum mechanical stirring were mixed 1 hour, keeping in this liquid form mixt, adding magnetic particle gradually under the whipped state then, adding back continuation stirring shifts in the ball grinder after 2 hours, three kinds of Stainless Steel Balls that the adding diameter is respectively 5mm, 15mm, 20mm carry out ball-milling processing, the ball milling time is 24 hours, promptly prepares magnetic flow liquid.The room temperature null field viscosity of this magnetic flow liquid is 0.31mPa.S, and magnetic field down cut stress is 28kPa, leaves standstill that rate of descent is 7% after three months, and is easy to after the sedimentation separate.
Claims (10)
1, a kind of guar gum magnetic flow liquid, it is characterized in that, each component and the weight percent thereof that comprise are: the magnetic particle that satisfies the requirement of magnetic flow liquid magnetic rheology effect: 35-94%, dispersion medium: 5-60%, guar gum: 0.1-10%, other additives: 0-10%, described dispersion medium is that nonpolar and low volatilization and water content are lower than 1% organic liquid, described other additive-package oil scraper acid, polyoxyethylene glycol, the mixture of one or more in these tensio-active agents of silane coupling agent, and nanometer or micron order inorganic bentonite, silicon-dioxide, alumina powder jointed, the mixture of one or more in these inorganic thixotropy additives of sapphire whisker.
2, guar gum magnetic flow liquid according to claim 1 is characterized in that, described magnetic particle is for having paramagnetism, superparamagnetism, ferromagnetic particle, and the weight percentage of magnetic particle in magnetic flow liquid is 45-80%.
3, guar gum magnetic flow liquid according to claim 2 is characterized in that, described to have paramagnetism, superparamagnetism, ferromagnetic particle be carbonyl iron dust, and the size range of powder is at 0.1-100 μ m.
4, guar gum magnetic flow liquid according to claim 3 is characterized in that, described carbonyl iron dust powder is 1-10 μ m.
5, guar gum magnetic flow liquid according to claim 1 is characterized in that, described guar-bean rubber powder is white or faint yellow powder, and the particle diameter of powder is at 0.01-1000 μ m.
According to claim 1,3,4 or 5 described guar gum magnetic flow liquids, it is characterized in that 6, the particle diameter of described guar-bean rubber powder powder is 5-20 μ m, addition is the 0.5-2% weight percent.
7, guar gum magnetic flow liquid according to claim 1 or 5 is characterized in that the existence form of described guar gum in magnetic flow liquid is independent powder, or is coated on the magnetic particle surface.
8, guar gum magnetic flow liquid according to claim 1 or 5 is characterized in that, the powder that the guar gum that is adopted is directly obtained by natural guar-bean direct physical processing and preparing, or the various guar derivatives that obtain through chemical modification.
9, guar gum magnetic flow liquid according to claim 1 is characterized in that, described dispersion medium is one or more the mixture in various silicone oil, mineral oil, hydraulic efficiency oil, the two lipid organic liquids,
10, guar gum magnetic flow liquid according to claim 1 is characterized in that, described other additive amount are the 0.5-2% weight percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410016427 CN1232621C (en) | 2004-02-19 | 2004-02-19 | Magnitic rheological liquid of guargum |
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| CN 200410016427 CN1232621C (en) | 2004-02-19 | 2004-02-19 | Magnitic rheological liquid of guargum |
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| CN1560209A CN1560209A (en) | 2005-01-05 |
| CN1232621C true CN1232621C (en) | 2005-12-21 |
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| CN 200410016427 Expired - Fee Related CN1232621C (en) | 2004-02-19 | 2004-02-19 | Magnitic rheological liquid of guargum |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100385577C (en) * | 2005-02-25 | 2008-04-30 | 同济大学 | High property magnetic rheological fluid using carbon nono tube as anti-sedimentation agent and its preparation method |
| CN100454452C (en) * | 2006-10-10 | 2009-01-21 | 武汉理工大学 | Stable silicone oil based magnetic rheologic liquid, and preparation method |
| CN102136334B (en) * | 2011-01-08 | 2012-09-05 | 北京交通大学 | Magnetic liquid applicable to large gap magnetic liquid sealing |
| CN103805156A (en) * | 2012-11-09 | 2014-05-21 | 中国石油化工股份有限公司 | Modified guanidine gum fracturing fluid as well as preparation method and application thereof |
| CN103542099A (en) * | 2013-10-09 | 2014-01-29 | 北京交通大学 | Magnetic liquid with improved sealing pressure bearing capacity |
| CN112863803A (en) * | 2019-11-28 | 2021-05-28 | 台北科技大学 | Magnetorheological fluid and manufacturing method thereof |
| CN111623072A (en) * | 2020-06-09 | 2020-09-04 | 湖南大学 | Fluid damper |
| CN113444564A (en) * | 2021-06-28 | 2021-09-28 | 陈进操 | Modified magnetic particles suitable for large-scale production, magnetorheological fluid, and preparation method and application thereof |
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