Polymeric magnetic material

 

(57) Abstract:

The invention relates to the technology of production of ferrites, in particular, magnetoplasmon used in household appliances, electrical engineering, electronics, instrumentation, etc. Offered polymeric magnetic material containing a polymeric binder, the magnetic filler in the form of particles of magnetic material the size of 1-500 nm and modifying additive, representing metallosalen lubricant, namely, lubricating oil with additives of colloidal graphite and colloidal iron or bismuth. The technical result is to increase the wear resistance and magnetic characteristics. table 2.

The invention relate to a technology for ferrites and specifically relates to the polymeric magnetic materials (magnetoplasmon) intended for use in household appliances, electronics, electrical engineering, instrument engineering, medicine, aviation, etc.

Known polymeric magnetic material containing as a polymeric binder phenolic resin and a powder of a magnetic material (filler), for example powder, strontium ferrite or Nd-Fe-B, taken in the quantity of 75-80 wt.%. The magnetic powder Eivat at 120-180C [US 3428603, 1969]. The result magnets with low magnetic characteristics (residual induction Br ~0,145 T, the coercive force Hwith=30-40 kA/m), which limits the scope of a magnetic material and, in addition, to obtain the magnets of complex shape required additional machining, reducing the magnetic characteristics of the material.

Known polymeric magnetic material containing low viscosity polymer binder (for example, synthetic divinely rubber) with a curing agent and a magnetic powder filler (the degree of filling of up to 75 wt.%), in which a mixture of at least two fractions of the magnetic powder, distinguished from one another by a dispersion of particles of not less than 5 times (for example, the fraction with a grain size of 2-5 μm, 25-50 μm, 250-300 μm). The components are mixed in a heated vacuum mixer (temperature up to 80C), create the vacuum (0.6 to 3 kPa), and after mixing, the mass is poured into molds (moulds), then heated to 80-120C (polymerization) and utverjdayut in a magnetic field of not less than 1 T for 2-24 h, cooled and extracted the finished magnets. As the magnetic particles used ferrites, such as strontium FY magnetic induction of up to 0.75 T and coercive force of up to 600 kA/m when mixing the components using the ultrasonic oscillation frequency 20-45 kHz or AC magnetic field frequency of 5-60 Hz.

Known metalloelastase permanent magnet obtained from a mixture containing polymer anaerobic binder type Uniterms and the magnetic filler alloys, SmCo5(31.5 wt.% Sm or Nd11Dy6Fe75B8, milled in a planetary mill in the presence of the anaerobic binder and hardener [EN 2032495, 10.04.1995]. The resulting mixture is pressed under pressure in a magnetic field, process the pressed billets in boiling water, dried in a vacuum thermostat at temperatures up to 100C and the part is subjected to application in a constant magnetic field of 20-25 EC. Get a magnetic material with high magnetic and mechanical characteristics: residual magnetic induction of up to 8500 Gauss, a coercive force of up to 6800 e, the maximum magnetic energy (BH)max~ 12-13 MGSA, the operating temperature 90-100C, compressive strength of 16 to 20 kgf/cm2. However, the technology of obtaining of such material is quite complicated, because, first of all, using anaerobic polymeric binder, cured in the absence of air (oxygen). In addition, the material is not good enough properties of elasticity, and, consequently, in wear, which reduces its magnetic is undertaken invention is a flexible polymer magnetic material, containing a polymeric binder consisting of a thermoplastic elastomer, the elastomer component (polyisopropylene or polyvinyl-n-butyl ether) and rubrics as a modifying additive, and a magnetic filler powder of ferrite (up to 90 wt.%) brand five 6030.017 THAT. Get magnetic material with heat resistance up to 100-115S, elasticity (radius rounding) 3-10 mm, the residual magnetic induction of the order of 0.24 T and (BH)max=10,8 kJ/m3[EN 2015583, 30.06.1994]. However, this material has magnetic properties and wear resistance, does not meet the high requirements of these materials.

The technical objective of the claimed invention to provide a polymeric magnetic material with high magnetic characteristics (high coercive force and residual magnetization) and increased wear resistance.

The goal of the project is achieved in that the polymer magnetic material (magnetoplasma) containing a polymer binder, a magnetic filler and modifier additive comprises a magnetic filler particles of magnetic material with a size of 1-500 nm, and as a modifying additive contains metallosalen grease, presented the relation of components, wt.h.:

Polymer binder 100

The above particles of magnetic material 40-1000

The above metallogaloidnye grease 1-50

As a polymeric binder in magnetoplasma according to the invention is used elastomers, such as various rubbers, for example, perkowski based on copolymers of tetrafluoroethylene or of triptoreline with vinylidenefluoride (for example, brand SKF-26, SCF-32, etc.) [C. M. Sobolev and other Industrial synthetic rubbers. M, Chemistry, 1977, S. 233-237]; silicone rubbers (siloxane), for example, dimethylpolysiloxane SKT, SKTV, SKTFV-803 [ibid, S. 203-218], silicone rubbers, such as COP-5 (TU 381103483-80), silaprene rubber stamps the CEA and F-18 (TU 2252-043-05808020-99) with the addition of hardeners of methyltriacetoxysilane or ethyltriethoxysilane with the possible addition of ORGANOTIN curing catalyst, taken in conventional amounts (2-5 wt.h. on 100 wt.h. of rubber; acrylic rubbers, such as butyl acrylate rubber stamps TANK (TU 38-103-481-80) on the basis of a copolymer of butyl acrylate with 10-20 wt.% Acrylonitrile; nitrile rubbers, for example, SKN-40, SKN-26 and others [see, ibid., S. 151-155]; polyurethane rubber stamps SKU, chlorosulfonation acrylic resins based on copolymers of acrylic and methacrylic acids and their esters, Acrylonitrile, polyamide, polyvinyl chloride, etc.

As the magnetic filler material according to the invention contains particles with a size of 1-500 nm of various magnetic materials such as Fe, Co, Ni, Cr; various alloys based on these elements, such as Fe-Co, Fe-Ni, Fe-Pt alloys of different concentrations; alloys based on rare earth elements, such as NdFeB, Sm2Co17Sm2Fe17Nxand others, various ferrites, such as F2O3where M-MP, Co, Ni, cu, Zn, Mg, Cd, Ni-Zn and Mn-Zn ferrite, barium hexaferrite and strontium, wolframite FeMnWO4and others.

These nanoparticles can be obtained by various known methods: sputtering and evaporation of metals and their alloys in a vacuum; the grinding of larger particles of materials with appropriate devices (colloid mill, ultrasonic generators, and so on); chemical methods: recovery in the solution of metal ions to atoms under conditions favorable for the subsequent formation of small metal clusters or aggregates (chemical reducing agents such as hydrazine, borhydride, hydrogen; radiation and electrochemical reduction), thermal decomposition of metal-containing compounds (CARBONYLS, Formenti and fairly well described [see, for example, Taparko A. C. and others - Journal of physical chemistry, 1996, so 70, No. 10, 1894; Pileni M. and others - Langmuir, 1997, T. 13, 3266; Pomogailo A. D. and other Nanoparticles of polymers in metals.-M.: Chemistry, 2000, 672 S.]. For example, particles of metallic iron nanometer size obtained by recovery of iron compounds with hydrogen at 250-400C) with subsequent stabilization of the particles surface-active agent in a hydrocarbon solvent (hexane, xylene, acetone), filtration and drying of the final product.

Used in the claimed invention metallosalen grease (lubricating oil, in which suspendirovanie colloidal particles) are suspendirovanie powders of colloidal graphite and iron or powders of colloidal graphite and bismuth content in an amount of 0.1-0.2 wt.%. Powders of colloidal graphite and metals (iron, bismuth) get different well-known methods: the method of dispersion in the presence of surfactants, the electrolytic method (the process of electrolytic extraction of metals from aqueous solutions of the corresponding salts in the form of fine cathodic precipitation followed by their dispersion in organic medium in the presence of surfactants, viparita what densities metals with the formation of colloidal particles in a liquid medium in the recovery of metal ions, etc. [see, for example, Nathanson, E. M. Colloidal metals. Kiev, ed. USSR Academy of Sciences, 1959, S. 8-15, 25-50, 57-75].

As lubricating oils use a variety of lubricants based on mineral oils with various additives, such as aviation lubricating oil MS.

Magnetodielectric (magnetoplasma) according to the invention is obtained by mixing, for example, elastomeric binder with particles of magnetic material with subsequent introduction into the mixture metallocyanide lubrication. The mixing is carried out, for example, in plastictree “Brabender” (type PLV-150) at 130-150C at frequency of rotation of the rotor about 60-80/min; the mixture is discharged and served on rolls (Lituanie), procurement of the necessary thickness is passed through the calender and pressed. Mixing can be done in the mill. The magnetic material can be obtained in the form of cords, long strips, sheets, various products of complex shapes, and so on, pressing, molding, extrusion, followed by stamping, cutting.

In table.1 presents examples of embodiment of the invention.

The resulting magnetoplasma (magnetic material) has a high coercive force (1000-16000 e) and the residual magnetic induction (2500-7000 HS), high-wear resistance (coefficient of friction of 0.02 to 0.08)such magnetic characteristics, high wear resistance, good elasticity, so you can use it in various fields of national economy (for the manufacture of permanent magnets, components of electric motors and electric appliances in the advertising industry, and so on).

Polymeric magnetic material containing a polymeric binder, the magnetic filler and modifier additive, characterized in that it contains as magnetic filler particles of magnetic material with a size of 1-500 nm, as well as modifying additives - metallosalen grease, representing the lubricating oil additives of 0.1-0.2 wt.% colloidal graphite and iron or colloidal graphite and bismuth in the following ratio, wt.h.:

Polymer binder 100

The above particles of magnetic material 40-1000

The above metallogaloidnye grease 1-50

 

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