Stirrer preventing pollution

A technology to prevent pollution and stirrers, applied in the direction of dissolution, mixers, chemical instruments and methods, etc., can solve the problems of affecting uniform distribution, affecting reaction results, polluting chemical synthesis process, etc., to achieve easy demagnetization, small coercive force, The effect of high magnetic permeability

Active Publication Date: 2019-06-14
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AI-Extracted Technical Summary

Problems solved by technology

[0003] The magnetic stirrer has the advantages of simple structure and small volume, but the current stirrer is mainly composed of a permanent magnetic core and a polymer material wrapped outside, which causes the stirrer to be adsorbed on the surface during storage and use. Magnetic dust particles such as iron, nickel, cobalt and their alloys pollute the chemical synthesis process
In addition, in biological experiments, pharmaceutical separation and purification, and material and substance analysis, the existence of these fine dust particles...
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The invention provides a stirrer preventing pollution. The stirrer is composed of a stirrer core and an outer wrapping layer, wherein the stirrer core is made of a soft magnetic material, and the outer wrapping layer is made of a polymer or glass material. The stirrer core and the outer wrapping layer are prepared through hot-melting, mold pressing and heat molding. The soft magnetic material of the stirrer core can be easily magnetized and demagnetized, the stirrer rotates for stirring under the action of a magnetic field of a magnetic stirring device, and after the stirrer stops stirring andleaves the magnetic field, all or most of obtained magnetism disappears, so that the situation that in the storage and using processes of existing stirrers, magnetic impurities such as iron, nickel,cobalt and alloys thereof are attracted on the surfaces, and consequently chemical synthesis, biological experiments, medicine separation and purification and the material and substance analysis process are polluted is avoided.

Application Domain


Technology Topic

Magnetic stirrerChemical synthesis +10


  • Stirrer preventing pollution
  • Stirrer preventing pollution
  • Stirrer preventing pollution


  • Experimental program(3)

Example Embodiment

[0018] Example one
[0019] figure 1 It is a schematic diagram of a PTFE-wrapped silicon steel core agitator prepared by a molding method. The preparation process is as follows: weigh 0.8 grams of the dried 50-mesh PTFE powder, and put part of the polytetrafluoroethylene in the agitator grinding tool. Tetrafluoroethylene powder, then place the silicon steel core and add the remaining powder. Put the mold on the press, press the required 500kg/cm 2 The pressure is slowly increased, and the air should be properly vented during the pressurization process, and after reaching the specified pressure, it is generally maintained for 12 minutes. Place the pressed agitator blanks in the sintering furnace as required, close the furnace door, and heat up to 350°C to sinter the blanks for 5 minutes. Cool, shape and remove burrs to obtain a PTFE-coated silicon steel core stirrer.

Example Embodiment

[0020] Example two
[0021] figure 2 It is a schematic diagram of a tetrafluoroethylene-hexafluoropropylene copolymer coated with nickel-iron permalloy core stir bar prepared by thermoforming. The preparation process is as follows: the nickel-iron permalloy core is inserted into the tetrafluoroethylene-hexafluoropropylene copolymer In the material pipe, heat to 300°C for 2 minutes to soften the polymer pipe while vacuuming. Under vacuum conditions, the softened polymer is tightly wrapped on the surface of the permalloy core, and finally the two ends are heated to fuse to remove the burrs to obtain a tetrafluoroethylene-hexafluoropropylene copolymer wrapped nickel-iron permalloy core stir bar.

Example Embodiment

[0022] Example three
[0023] image 3 It is a schematic diagram of preparing a glass-wrapped amorphous iron-nickel alloy core stirrer by the hot melting method. The preparation process is as follows: the high-temperature glass melt taken out of the hot melting furnace is inserted into the amorphous iron-nickel alloy core, and the alloy is processed The core is completely wrapped in the glass, placed in the stir bar mold while it is hot, and is slowly cooled to obtain the glass-wrapped amorphous iron-nickel alloy core stir bar.


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Description & Claims & Application Information

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