Demolding agent for protecting neodymium iron boron pressed blank and mold

Abstract

The invention discloses a demolding agent for protecting a neodymium iron boron pressed blank and a mold. The demolding agent comprises diethyl ether, petroleum ether and zinc stearate particles, andthe proportion of the diethyl ether, the petroleum ether and the zinc stearate particles is, by weight, 32-42 parts of the diethyl ether, 30-40 parts of the petroleum ether and 0.5-2 parts of the zincstearate particles. According to the demolding agent for protecting the neodymium iron boron pressed blank and the mold, because the diethyl ether has a low boiling point and is extremely volatile, the petroleum ether and the diethyl ether with the boiling range being 60-90 DEG C are selected and mixed in a ratio of 1:1 to be capable of delaying the volatilization speed, and the zinc stearate particles have a lubricating effect, so that the mold is protected while residue is reduced.

Description

technical field [0001] The invention relates to auxiliary materials used in the processing and manufacturing of NdFeB, in particular to a release agent used in the NdFeB molding process to protect NdFeB compacts and molds. Background technique [0002] In the production process of NdFeB, the forming process is a very important link. In order to make the formed compact separate from the mold smoothly, to ensure the appearance of the compact and the mold not to be damaged, it is generally necessary to use a release agent. At present, the production of neodymium Oil-based release agents are usually used in the iron-boron industry. The problems of oil-based release agents are high cost, many residues, poor release effect, and more cracks and corner drop on the surface of the green compact. The main component of the oily release agent is silicone oil and other oily substances, which are not easy to volatilize, so there are more residues on the surface of the compact after sprayin...

AI Technical Summary

Problems solved by technology

[0002] In the production process of NdFeB, the forming process is a very important link. In order to make the formed compact separate from the mold smoothly, to ensure the appearance of the compact and the mold not to be damaged, it is generally necessary to use a release agent. At present, the production of neodymium The iron-boron industry usually uses oil-based release agents. The problems of oil-based release agents are high cost, many residues, and poor release effect. There are many cracks and corner drop phenomena on the compact surface

The main component of the oily release agent is silicone oil and other oily substances, which are not easy to volatilize, so there are more residues on the surface of the compact after spraying, and studies have shown that the magnetic properties of NdFeB magnets increase with the increase of carbon content. and reduced corrosion resistance

Therefore, the effect of the oily release agent used in the current production of NdFeB magnets is not very ideal, the release effect is poor, and it will also affect the magnetic properties of NdFeB magnets

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