Preparation method for flexible rubber neodymium iron boron magnet with high filling ratio

A technology of rubber NdFeB and NdFeB, which is applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve the problems of rubber NdFeB magnets with poor mechanical properties, small filling volume, and poor performance. Achieve the effects of improving mechanical properties, magnetic properties, and reducing processing difficulty

Active Publication Date: 2019-05-21
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the defects of the rubber NdFeB magnets in the prior art that the filling amount of NdFeB magnet powder is small, resulting in poor performance, and at the same time, the obtained rubbe

Method used

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  • Preparation method for flexible rubber neodymium iron boron magnet with high filling ratio
  • Preparation method for flexible rubber neodymium iron boron magnet with high filling ratio
  • Preparation method for flexible rubber neodymium iron boron magnet with high filling ratio

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (S.1) Surface modification: (1) Degreasing and degreasing: add NdFeB powder with a maximum magnetic energy product of 5MGOe into the acidic washing solution, pass air into it to stir the NdFeB powder, and treat at 45°C for 30min Afterwards, filter and wash to neutrality to obtain oil-free NdFeB powder; wherein, each 1L of acidic lotion contains 30ml of concentrated hydrochloric acid with a concentration of 36%, 10g of boric acid, 12g of sodium dodecylbenzenesulfonate and hexamethylene Tetramine 2g;

[0041] (2) Surface phosphating: immerse non-greasy NdFeB powder in phosphating solution, phosphating at 30°C for 15 minutes, filter, wash and dry to obtain NdFeB powder with phosphating film on the surface; The chemical solution contains 90g of zinc dihydrogen phosphate, 15g of phosphoric acid, 4g of ammonium molybdate, 10g of hydrogen peroxide, 4g of sodium borate, 4g of tartaric acid and 0.5g of potassium fluoride;

[0042] (3) Coupling agent treatment: Add 95 parts of N...

Embodiment 2

[0047] The difference from Example 1 is that the addition ratio of surface modified NdFeB powder and rubber is changed, surface modified NdFeB powder: 96%, NBR: 2.2%, sulfur 0.8%, antioxidant RD 0.5% , Epoxidized soybean oil 0.5%. See Table 1 for details, and see Table 2 for the magnetic properties of the prepared rubber magnets.

Embodiment 3

[0049] (S.1) Surface modification: (1) Degreasing and degreasing: add NdFeB powder with a maximum energy product of 12 into the acidic washing solution, pass air into it to stir the NdFeB powder, and treat at 50°C for 30 minutes Filter and wash until neutral to obtain oil-free NdFeB powder; each 1L of acidic lotion contains 50ml of 36% concentrated hydrochloric acid, 3g of boric acid, 15g of sodium dodecylbenzenesulfonate and hexamethylenetetramine 1g;

[0050] (2) Surface phosphating: immerse non-greasy NdFeB powder in phosphating solution, phosphating at 40°C for 30 minutes, filter, wash and dry to obtain NdFeB powder with phosphating film on the surface; The chemical solution contains 95g of zinc dihydrogen phosphate, 20g of phosphoric acid, 4g of ammonium molybdate, 12g of hydrogen peroxide, 5g of sodium borate, 5g of tartaric acid and 1g of potassium fluoride;

[0051] (3) Coupling agent treatment: add NdFeB powder with phosphating film on the surface to the ethanol solu...

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Abstract

The invention relates to the field of rubber magnets, in particular to a preparation method for a flexible rubber neodymium iron boron magnet with a high filling ratio. The preparation method comprises the following steps that: adding neodymium iron boron powder into organic solvent containing silane coupling agent and epoxy resin to obtain surface modified neodymium iron boron powder; then, evenly mixing the surface modified neodymium iron boron powder, rubber type binder and auxiliary materials, and then, carrying out banburying to obtain a rubber neodymium iron boron granule material; carrying out compression molding on the obtained rubber neodymium iron boron granule material to obtain a semi-finished product; and cutting and magnetizing the obtained semi-finished product, and packaging to obtain a flexible rubber neodymium iron boron magnet finished product. By use of the preparation method, the defects in the prior art that the neodymium iron boron magnet has a small neodymium iron boron magnet powder filling amount, poor magnetic property and poor mechanical property can be overcome, so that the preparation method has the advantages that the filling ratio of the neodymium iron boron powder is high, the magnetic property is good, the mechanical property of the flexible rubber neodymium iron boron magnet is effectively improved and the processing difficulty of the flexiblerubber neodymium iron boron magnet is lowered.

Description

technical field [0001] The invention relates to the field of rubber magnets, in particular to a method for preparing a flexible rubber NdFeB magnet with a high filling ratio. Background technique [0002] Traditional flexible rubber NdFeB is generally prepared by double-roll calendering, extrusion and other processes. The processing technology is simple and easy to form. It can be prepared into sheets, strips, rings and other complex shapes to meet different requirements. It can be widely used in industries such as micro motors, refrigerator door seals, toys, stationery, and advertisements. [0003] The powder filling ratio of flexible rubber NdFeB products prepared by traditional technology is generally lower than 93wt%, resulting in generally low magnetic properties. In addition, the traditional molded NdFeB powder is mixed with epoxy resin and NdFeB powder and then dry-pressed. Although this molding process can achieve a high filling ratio, the prepared product does not ...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
Inventor 杜军杰赵宇航曹江金磊
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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