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Granular material for injection-molded nylon-12-permanent magnetic ferrite and preparation method of granular material

A technology of permanent ferrite and granules, applied in the field of injection molding nylon 12-permanent ferrite granules and its preparation, can solve the problem that the strength and precision of injection molding nylon 12-permanent ferrite granules are not high enough, and cannot meet the strict requirements of automobile motors. requirements, etc., to achieve the effect of improving the tensile strength

Active Publication Date: 2016-05-18
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At this stage, the strength and precision of injection molded nylon 12-permanent ferrite pellets are not high enough to meet the stringent requirements of injection molded magnets for automotive motors (especially high-end new energy vehicle motors) and high-end home appliance motors

Method used

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  • Granular material for injection-molded nylon-12-permanent magnetic ferrite and preparation method of granular material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of injection molding nylon 12-permanent ferrite granular material, by 100kg permanent magnetic Sr ferrite magnetic powder, 10kg nylon 12, 0.90kg chopped glass fiber, 0.25kg sodium metaphosphate, 0.50kg silane coupling agent, 0.25kg hard Calcium fatty acid is mixed and granulated.

[0026] Prepare as follows:

[0027] 1) Surface treatment of magnetic powder: Put 100kg of permanent magnet Sr ferrite magnetic powder in the powder mixing tank, add 0.25kg of sodium metaphosphate, 0.50kg of silane coupling agent (dissolved in 5L of isopropanol in advance), at a temperature of 120°C Mix the powder for 30 minutes;

[0028] 2) Add 10kg of nylon 12, and continue to mix the powder for 15 minutes at a temperature of 120°C;

[0029] 3) Add 0.90kg of chopped glass fiber and 0.25kg of calcium stearate, continue mixing powder at 120°C for 15 minutes, and raise the temperature to 150°C, and continue mixing powder for 15 minutes;

[0030] 4) Granulation: inject the mixed nylon ...

Embodiment 2

[0033] A kind of injection molding nylon 12-permanent ferrite pellets, consisting of 100kg permanent magnet Sr ferrite magnetic powder, 9.8kg nylon 12, 0.90kg chopped mica sheet, 0.25kg sodium metaphosphate, 0.50kg silane coupling agent, 0.40kg Silicone oil is mixed and granulated.

[0034] Prepare as follows:

[0035] 1) Surface treatment of magnetic powder: Put 100kg of permanent magnet Sr ferrite magnetic powder into the powder mixing tank, add 0.25kg of sodium metaphosphate, 0.5kg of silane coupling agent (dissolved in 5L of isopropanol), and mix the powder at 110°C for 20 minutes ;

[0036] 2) Add 9.8kg of nylon 12, and continue mixing for 10 minutes at a temperature of 110°C;

[0037] 3) Add 0.9kg of chopped mica flakes and 0.40kg of silicone oil, continue mixing for 10 minutes at a temperature of 110°C, and raise the temperature to 160°C, and continue mixing for 10 minutes;

[0038] 4) Granulation: inject the mixed nylon 12-permanent ferrite magnetic powder mixture i...

Embodiment 3

[0041] A kind of injection molding nylon 12-permanent ferrite pellets, consisting of 100kg permanent magnet Sr ferrite magnetic powder, 10.3kg nylon 12, 0.60kg chopped potassium titanate fiber, 0.25kg sodium tripolyphosphate, 0.50kg silane coupling agent , 0.20kgEBS mixed granulation made.

[0042] Prepare as follows:

[0043] 1) Surface treatment of magnetic powder: Put 100kg of permanent magnet Sr ferrite magnetic powder in the powder mixing tank, add 0.25kg of sodium tripolyphosphate, 0.50kg of silane coupling agent (dissolved in 5L of isopropanol), and mix the powder at a temperature of 100°C 40min;

[0044] 2) Add 10.3kg of nylon 12, and continue mixing for 30 minutes at a temperature of 100°C;

[0045] 3) Add 0.60kg chopped potassium titanate fiber and 0.20kg EBS, continue mixing powder at 100°C for 20 minutes, and raise the temperature to 140°C, and continue mixing powder for 30 minutes;

[0046] 4) Granulation: inject the mixed nylon 12-permanent ferrite magnetic po...

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Abstract

The invention discloses a granular material for injection-molded nylon-12-permanent magnetic ferrite and a preparation method of the granular material. The granular material is prepared from the following components including permanent magnetic ferrite magnetic powder, nylon12, a reinforcing agent, a dispersant, a coupling agent and a lubricant through mixing granulation. The preparation method comprises specific steps as follows: (1), treatment of surfaces of the magnetic powder: the permanent magnetic ferrite magnetic powder is put into a powder mixing cylinder, and the dispersant and the coupling agent in a proper proportion are added; (2), addition of nylon12; (3), addition of the reinforcing agent and the lubricant; (4), granulation: the uniformly mixed nylon12 and permanent magnetic ferrite magnetic powder mixture is injected into a granulator for granulation. The granular material and the preparation method have the benefits as follows: by comparison with commercially available and universal granular materials for injection-molded nylon12-permanent magnetic ferrite, the bending strength and the tensile strength of the granular material can be improved by 20%-50%, and the granular material has high strength and high precision and can meet rigid requirements for injection-molded magnets for existing automobile motors, especially motors for high-grade new-energy powered automobiles and for high-grade household appliances.

Description

technical field [0001] The invention relates to the technical field related to the production of injection-molded permanent magnet materials, in particular to an injection-molded nylon 12-permanent magnet ferrite granular material and a preparation method thereof. Background technique [0002] Bonded magnets are polymer-based composite permanent magnet materials made of magnetic powder and binders such as resin, rubber or low-melting point metals, and then made by injection molding, compression molding or extrusion molding. an important branch of . There are two main types of binder materials used: polymers (such as rubber, thermoplastic or thermosetting resins) and low melting point metals (such as Zn, Sn, Cu, AI and their alloys, etc.). [0003] The injection molding method is to mix and granulate the magnetic powder and resin powder, and then inject the granulated granules into the injection molding machine to heat and melt them to make them have good fluidity. In this s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08K13/06C08K9/02C08K9/06C08K7/14C08K3/22C08K5/098B29B9/06
CPCB29B9/06C08K3/22C08K5/098C08K7/08C08K7/14C08K9/02C08K9/06C08K13/06C08K2003/2265C08L77/02C08L83/04C08K3/34
Inventor 金志洪胡江平何国栋
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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