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Magnet preform, magnet assembly and preparation method thereof

A technology of magnet assemblies and prefabricated parts, which is applied in the manufacture of permanent magnets, magnets, magnetic objects, etc., and can solve problems such as reducing the bonding performance of epoxy resins

Active Publication Date: 2022-07-22
BAOTOU TIANHE MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the coating has a certain corrosion resistance, the bonding performance of the epoxy resin is greatly reduced due to the addition of too many components.

Method used

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  • Magnet preform, magnet assembly and preparation method thereof
  • Magnet preform, magnet assembly and preparation method thereof
  • Magnet preform, magnet assembly and preparation method thereof

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preparation example Construction

[0065]

[0066] The magnet assembly of the present invention is obtained through the steps of spraying, pre-curing and curing. The expandable composition for spraying on the surface of the magnet body can be prepared by the following method. The description will be made below.

[0067] (a) reacting ammonium polyphosphate, aliphatic polyol and epoxy resin, and cooling to obtain a first reactant; preferably, reacting ammonium polyphosphate, aliphatic polyol and epoxy resin in the presence of a solvent.

[0068] (b) reacting the first reactant with water-soluble carbodiimide or a salt thereof and N-hydroxysuccinimide or a derivative thereof to obtain a composition.

[0069] According to one embodiment of the present invention, the expandable composition is prepared by the following method:

[0070] (a) in the presence of a solvent, first reacting ammonium polyphosphate, aliphatic polyol and epoxy resin at low temperature, then at high temperature, and cooling to room temperat...

Embodiment 1 and comparative example 1～3

[0089] According to the formula in Table 1, ammonium polyphosphate, pentaerythritol, epoxy resin, triethylenetetramine and cyclohexanone were reacted at 50 °C for 4 hours, then heated to 80 °C for 2 hours, and cooled to room temperature to obtain the first reactant.

[0090] The first reactant was reacted with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) at 25°C for 3 h to obtain a pre-reactant; then the pre-reactant was reacted with N-hydroxysuccinimide (NHS) was reacted at 25° C. for 4 h to obtain swellable compositions (Example 1 and Comparative Example 3) or non-swellable compositions (Comparative Examples 1-2).

[0091] Table 1

[0092] Numbering Ammonium polyphosphate Pentaerythritol epoxy resin triethylenetetramine Cyclohexanone EDC NHS Example 1 15wt% 10wt% 35wt% 15wt% 15wt% 5wt% 5wt% Comparative Example 1 — — 35wt% 32.5wt% 32.5wt% — — Comparative Example 2 — — 35wt% 27.5wt% 27....

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Abstract

The invention discloses a magnet preform, a magnet assembly and a preparation method thereof. The magnet preform includes a magnet body and an expandable layer attached to the surface of the magnet body; the expandable layer is composed of (1) 10-25wt% ammonium polyphosphate, (2) 5-20wt% aliphatic polyol , (3) 20-50wt% epoxy resin, (4) 2-10wt% water-soluble carbodiimide or its salt and (5) 2-10wt% N-hydroxysuccinimide or its derivative. An intumescent composition is formed. The magnet preform can improve the bonding force between the magnet body and the base body.

Description

technical field [0001] The present invention relates to a magnet preform, a magnet assembly and a preparation method thereof. Background technique [0002] A magnet refers to a substance or material that can generate a magnetic field. It can not only attract some substances, but also repel some substances. It is generally divided into permanent magnets and soft magnets. Magnets have been widely used in generators, motors, compasses and so on. In some applications, it is necessary to firmly combine the magnet with the base to work stably. For example, in an AC motor, it is necessary to embed permanent magnets in the rotor core, and use the torque of the permanent magnets and the reluctance torque of the rotor core to rotate the rotor more efficiently. Usually, the permanent magnets are inserted into magnet insertion holes formed in the rotor core, and fixed to the rotor core with an adhesive. The permanent magnets are usually bonded to the rotor core using epoxy resin. Ep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/02H01F27/06H01F27/23H01F41/00H01F41/02H01F7/02C09D163/00C09D5/08C09D7/61C09D7/63
CPCH01F27/23H01F27/022H01F27/06H01F41/005H01F41/026H01F7/021H01F7/0221C09D163/00C09D5/08C09D7/61C09D7/63C08K2003/323C08K3/32C08K5/3415C08K5/29C08K5/053
Inventor 张明鑫刘延斌曾庆业王宏雪董义袁易陈雅袁文杰
Owner BAOTOU TIANHE MAGNETICS TECH CO LTD
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