Magnetic layer and preparation method thereof
A magnetic layer and magnetic recording technology, applied in the field of magnetic information materials, can solve the problems of coercive force, remanence, and steep hysteresis loop, etc., to improve adhesion performance, improve compatibility, and suppress crystallization. The effect of grain growth
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[0063] In a preferred embodiment of the present invention, the preparation method of the magnetic recording material includes the following steps: mixing the raw materials in proportion, densifying, pelletizing, pre-calcining at 1050-1200°C for 1-4h, coarsely crushing and then finely Grinding and tempering at 960-1020° C. for 1-4 hours to obtain the magnetic recording material.
[0064] In a preferred embodiment of the present invention, after pre-burning at 1050-1100°C for 1-2 hours, the temperature is raised to 1150-1200°C for 1-2 hours.
[0065] In a preferred embodiment of the present invention, the preparation method of the resin comprises the following steps:
[0066] (a) Mix linseed oil, maleic anhydride, trimethylolethane and pentaerythritol, keep warm and react at 200-210°C until the acid value is reduced to ≤10mg KOH / g, cool down to 140-150°C, add o Phthalic anhydride, heat preservation at 130-140°C to reduce the acid value to ≤60mg KOH / g, to obtain material a;
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Embodiment 1
[0074] The preparation method of the magnetic recording material described in the present embodiment, the steps are as follows:
[0075] (1) In parts by weight, weigh 135 parts of iron red (Tangshan Iron and Steel Group), 25 parts of strontium carbonate, 30 parts of barium carbonate, 1.2 parts of samarium oxide, 1.2 parts of titanium oxide, 1.6 parts of cobalt oxide, and 1.6 parts of zirconium oxide , 1.6 parts of nickel oxide, 2 parts of bismuth trioxide, and 0.25 parts of silicon dioxide (average particle size: 0.2 μm), mixed and placed in an ore mill, after densification treatment for 60 seconds, pelletized with water, the size of the pellets is 200 μm ;
[0076] (2) The pellets obtained in step (1) were pre-calcined at 1080°C for 2 hours, and after the pre-calcination was completed, they were coarsely crushed with a ball mill until the average particle size was 2.0 μm;
[0077] (3) placing the coarsely crushed material obtained in step (2) in a ball mill, and finely grind...
Embodiment 2
[0080] The present embodiment refers to the preparation method of Example 1, and the only difference is that the raw materials of this embodiment are 120 parts by weight of iron red (Tangshan Iron and Steel Group), 12 parts of strontium carbonate, 28 parts of barium carbonate, and 1 part of samarium oxide. 0.9 parts of titanium oxide, 1.7 parts of cobalt oxide, 1.7 parts of zirconia, 1.7 parts of nickel oxide, 1 part of bismuth trioxide, and 0.25 parts of silicon dioxide.
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