PPS-based permanent magnetic composite material and preparation method thereof

Abstract

The invention discloses a PPS-based permanent magnetic composite material and a preparation method thereof. The raw materials comprise 85-95 wt% of magnetic powder subjected to surface treatment and 5-15 wt% of an adhesive; wherein the adhesive is prepared from the following materials in percentage by weight: 0.1-60.0 wt% of thermoplastic resin, 40.0-99.0 wt% of polyphenylene sulfide resin, 0.1-10.0 wt% of a compatilizer, 0.01-1.0 wt% of an antioxidant and 0.01-1.0 wt% of a lubricating agent; wherein the surface-treated magnetic powder is prepared by coating the surface of the magnetic powderwith a coating material, the coating material is a silane or titanate coupling agent, and the use amount of the coating material is 0.01-1.0 wt% of the mass of the magnetic powder. According to the invention, other thermoplastic resins are added into the PPS for blending to prepare an adhesive, so that the defects of difficult molding, brittleness, poor toughness and the like of the PPS-based magnet are effectively overcome.

Description

technical field [0001] The invention relates to the technical field of permanent magnet material preparation, in particular to a PPS-based permanent magnet composite material and a preparation method thereof. Background technique [0002] Permanent magnets are an indispensable part of national economic development, and their application fields involve many fields such as motors, sensors, energy-saving elevators, and wind power generation. According to the processing method, permanent magnets are divided into sintered permanent magnets and bonded permanent magnets. The former is a traditional powder metallurgy method, while the latter uses a binder to combine magnetic powder and form it by injection molding, molding, etc. It has a unique Advantages: strong corrosion resistance, convenient processing, easy molding, etc. [0003] There are two main types of binders used to bond permanent magnets: thermoplastic and thermosetting resins. The thermoplastic resins commonly used in...

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Problems solved by technology

[0005] The present invention is to overcome the lack of toughness of the bonded permanent magnet prepared by using PPS as the binder in the prior art, especially when preparing thin-walled products, it is very easy to cracking, which seriously affects the product qualification rate; and when PPS is used as a binder, the melt viscosity is high, and the processing of the magnet is difficult, which affects the processing performance of the magnetic powder. A PPS-based permanent magnet composite material and its preparation method are provided. By adding Other thermoplastic resins and PPS are blended to prepare alloy resins, which can reduce the melt viscosity of the binder and improve the toughness of the material, while other mechanical properties and heat resistance have no obvious changes, which effectively solves the existing problems of PPS-based magnets such as molding difficulties and magnet brittleness , poor toughness and other shortcomings, the prepared magnet has high filling rate, excellent processing characteristics and good toughness, suitable for mass production

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