Flexible permanent magnetic material, preparation method and application thereof in magnetic biological effect products

Patent metadata

Field	Value
Publication number	US-12087482-B2
Application number	US-202318458975-A
Country	US
Kind code	B2
Filing date	Aug 30, 2023
Priority date	Sep 20, 2022
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A flexible permanent magnetic material, a preparation method and an application thereof in magnetic biological effect products are provides, relating to the technical field of medical equipment. Raw materials of the flexible permanent magnetic material of the application include the following components in parts by weight: 0-70 parts of anisotropic neodymium iron boron powder and 0-40 parts of anisotropic samarium iron nitrogen powder and 3-20 parts of binder.

First claim

What is claimed is:

1. A method for preparing a flexible permanent magnetic material, comprising:
(1) mixing raw materials according to parts by weight, followed by carrying out defoaming treatment to remove gas in a mixture;
wherein the raw materials comprise: 0-70 parts by weight of anisotropic neodymium iron boron powder, 0-40 parts by weight of anisotropic samarium iron nitrogen powder, 3-20 parts by weight of a binder, clay powder, zinc stearate, a dispersant and a lubricant;
wherein the anisotropic neodymium iron boron powder and the anisotropic samarium iron nitrogen powder are not 0 at a same time;
wherein the binder is two-component food-grade silica gel; and
wherein the lubricant is conductive carbon powder or graphene with a maximum amount that is 1% of a total mass of the anisotropic neodymium iron boron powder and the anisotropic samarium iron nitrogen powder;
(2) carrying out pouring treatment at 15-35° C. on the mixture obtained in the step (1) to obtain hybrid magnet blank slurry; and
(3) pouring the hybrid magnet blank slurry into a mold, heating while applying a magnetic field to upper and lower surfaces of the mold, then removing the magnetic field, and demoulding to obtain the flexible permanent magnetic material; wherein a magnetic field intensity does not exceed 5000 gausses;
wherein after the heating in the step (3), a system temperature is 80-150° C., and a heating duration is 1-8 h; and the mold is made of a non-magnetic conductive material.

2. The method for preparing the flexible permanent magnetic material according to claim 1 , wherein the mold is made of copper or aluminum alloy.

3. The method for preparing the flexible permanent magnetic material according to claim 1 , wherein after the heating in the step (3), the system temperature is 110-120° C.

Assignees

• Univ Beijing

Inventors

• Liu Shunquan
• Yang Jinbo
• Han Jingzhi
• He Yu

Classifications

• H01F41/00

  Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties · CPC title

• H01F7/0215

  Flexible forms, sheets · CPC title

• H01F1/083

  in a bonding agent · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F2302/256

  Silicium oxide (SiO2) · CPC title