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A low-density magnetic particle and a high-suspension-stability water-based magnetorheological polishing fluid prepared therefrom

A technology of magnetorheological polishing and magnetic particles, which is applied in the direction of magnetic liquids and polishing compositions containing abrasives, etc. It can solve the problems of long preparation time, difficult post-processing magnetization process, cumbersome process, etc., and achieves the effect of simple preparation method

Inactive Publication Date: 2018-08-31
ZHENGZHOU RES INST FOR ABRASIVES & GRINDING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1959871A Chinese patent has obtained a water-based magnetorheological fluid with good oxidation resistance and anti-sedimentation stability by using a chelating surfactant to interact with magnetic particles to form composite magnetic particles. The post-processing magnetization process mentioned is very difficult, usually takes more than 20-60 days, and the preparation time is very long
CN1613919A Chinese patent provides a method for preparing water-based magnetorheological fluid from magnetic particles wrapped in hydrophilic polymers. This method overcomes the disadvantages of poor suspension stability of magnetic metal particles in water, easy oxidative deterioration and agglomeration, but This method is relatively cumbersome, and requires more expensive chemical reagents such as ethoxysilane, and the production cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 30 parts of carbonyl iron powder with an average particle size of 0.5um, weigh 15 parts of polyester polyol with a molecular weight of 1000, 10 parts of sodium bicarbonate, and 10 parts of 2,4-toluene diisocyanate; in a beaker, add Polyester polyol, sodium bicarbonate, carbonyl iron powder, and pre-mix evenly by stirring, then inject the mixed material and 2,4-toluene diisocyanate into the mold quickly through the dropper at the same time, the mold used for mold release The agent is zinc stearate. Heat the material in the mold to 80°C for 30 minutes, cool it naturally after heating, let it solidify for 2 hours, demould after solidification, and obtain a density of 1 g / cm 3 magnetic assembly.

[0031] The obtained magnetic assembly is placed in a jaw crusher for crushing, and the crushed material is placed in a high-energy ball mill for ball milling. The ball milling time is 2 hours. After ball milling, it is added to water with sodium nitrite, and the The prepar...

Embodiment 2

[0034] Weigh Fe 3 N60 parts, the average particle diameter of which is 2um, weighed 15 parts of polyester polyols with a molecular weight of 3000, 15 parts of sodium bicarbonate, and 10 parts of 65 / 35-toluene diisocyanate. In a beaker, add polyester polyol with a molecular weight of 3000, sodium bicarbonate, Fe 3 N, and pre-mix well by stirring. The mixed substance and 65 / 35--toluene diisocyanate are quickly injected into the mold through a dropper at the same time, and the mold release agent used in the mold is silicone oil. Heat the material in the mold to 200°C for 5 minutes, cool it naturally after heating, let it solidify for 5 hours, demould after solidification, and obtain a density of 1.5 g / cm 3 magnetic assembly.

[0035]The obtained magnetic assembly is placed in a jaw crusher for crushing, and the crushed material is placed in a high-energy ball mill for ball milling. The ball milling time is 4 hours. After ball milling, it is added to water with sodium bicarbona...

Embodiment 3

[0038] Weigh 30 parts of iron-cobalt alloy with an average particle size of 1um, weigh 12 parts of polyester polyol with a molecular weight of 2000, 12 parts of calcium carbonate, and 10 parts of 80 / 20-toluene diisocyanate. In the beaker, add polyester polyol, calcium carbonate, iron-cobalt alloy in sequence, and pre-mix evenly by stirring. The mixed substance and 80 / 20-toluene diisocyanate are quickly injected into the mold through a dropper at the same time, and the mold release agent used in the mold is paraffin. Heat the material in the mold to 100°C for 20 minutes, cool naturally after heating, let it solidify for 3 hours, demould after solidification, and obtain a density of 1.1 g / cm 3 magnetic assembly.

[0039] The obtained magnetic assembly is placed in a jaw crusher for crushing, and the crushed material is placed in a high-energy ball mill for ball milling. The ball milling time is 2 hours. After ball milling, it is added to water with sodium nitrite, and the The ...

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Abstract

The invention relates to low-density magnetic particles and high-suspension-stability aqueous magnetorheological polishing fluid prepared from the same. The low-density magnetic particles are prepared from the following raw materials in parts by weight: 30 to 60 of magnetic particles with a particle size of 0.5 to 2mum, 15 to 20 of polyester polyol with a molecular weight of 1,000 to 3,000, 10 to 15 of foaming agent and 10 to 15 of isocyanate. The high-suspension-stability aqueous magnetorheological polishing fluid is prepared from the following raw materials in parts by weight: 50 to 60 of low-density magnetic particles, 15 to 35 of deionized water, 10 to 20 of polishing powder, 5 to 8 of surfactant, 0.05 to 0.5 of antioxidant and 0.1 to 1 of PH regulator. The high-suspension-stability aqueous magnetorheological polishing fluid disclosed by the invention can be kept being stably suspended for over months without being precipitated, and the product is used for optical non-plane polishing; surface roughness can reach Ra of below 10nm after polishing.

Description

technical field [0001] The invention belongs to the technical field of preparation of water-based magnetorheological polishing liquid, and in particular relates to a low-density magnetic particle and a high-suspension-stability water-based magnetorheological polishing liquid prepared therefrom. Background technique [0002] Magnetorheological fluid is a suspension formed by dispersing non-colloidal fine particles in a carrier liquid. Its basic composition is: ferromagnetic particles, carrier liquid, stabilizer. Magneto-rheological polishing is to add polishing powder into the magnetorheological fluid, and use the solidification phenomenon of the magnetorheological fluid to polish the surface of the workpiece. In a high-intensity gradient magnetic field, the magnetorheological polishing fluid hardens and becomes a viscoplastic Bingham medium. When this medium passes through the workpiece and forms a small gap with the moving disc, it will generate a large shear force on the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09G1/02H01F1/44
CPCC09G1/02H01F1/44
Inventor 王志强王沛
Owner ZHENGZHOU RES INST FOR ABRASIVES & GRINDING CO LTD