Regenerated rubber magnet and preparation method and application thereof

Abstract

The invention discloses a regenerated rubber magnet as well as a preparation method and application thereof. The preparation method of the regenerated rubber magnet comprises the following steps: (1)mixing waste rubber magnet with ferrite magnetic powder and then carrying out primary mixing; (2) carrying out primary microwave desulfurization on the material having been subjected to primary mixing; (3) carrying out secondary mixing on the material having been subjected to primary microwave desulfurization; (4) carrying out secondary microwave desulfurization on the secondarily mixed material to obtain a desulfurized ferrite-containing rubber magnet; and (5) adding rubber and a rubber additive into the desulfurized ferrite-containing rubber magnet, and conducting mixing again. The regenerated rubber magnet prepared in the invention has good magnetism and physical properties, can avoid carbonization of rubber powder, has no smooth and clean surface and no impurities, and can have the same magnetism, physical properties and surface properties as conventional rubber magnets.

Description

technical field [0001] The invention relates to the technical field of recycling magnetic materials, in particular to a regenerated rubber magnet and its preparation method and application. Background technique [0002] Rubber magnet is a kind of ferrite magnetic material series, which is made of bonded ferrite magnetic powder and synthetic rubber, and is made by extrusion molding, calendering molding, injection molding and other processes. It has softness, elasticity and twistability. The magnets can be processed into strips, rolls, sheets, blocks, rings and various complex shapes. Rubber magnets are mainly used in micro motors, refrigerators, disinfection cabinets, kitchen cabinets, toys, stationery, advertising and other industries. [0003] The wide application of rubber magnets also brings a lot of waste rubber magnets. With the improvement of environmental protection awareness, the expansion of environmental protection requirements and the increase of production cost...

AI Technical Summary

Problems solved by technology

Compared with non-vulcanized rubber magnets, the physical properties and reliability of vulcanized rubber magnets are better, but because it is difficult to recycle after vulcanization, its cost is high, which limits its application.

The current conventional rubber recycling methods include adding peptizers, low-temperature freezing and crushing, microwave heating desulfurization regeneration, etc. Among them, adding peptizing agents to make recycled rubber is inefficient; low-temperature freezing and crushing costs are high, and the magnetic properties of rubber magnets are not fully utilized. It is only suitable for use in some products with low performance and quality requirements, and the recycling value is low; microwave heating and desulfurization tend to accumulate a large amount of energy in the middle part of the rubber magnet, and it is easy to cause part of the rubber powder to be carbonized, and the obtained regenerated rubber magnet More air bubbles and impurities appear

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