Beta-iron oxyhydroxide-based compound powder and sol, method of preparing epsilon-ferric oxide compound powder, and manufacturing method of magnetic recording medium

A technology of iron oxyhydroxide and compound, which is applied in the direction of iron oxide/iron hydroxide, iron compound, iron oxide, etc., which can solve the problems such as the decrease of the strength of the magnetic layer film, and achieve the effect of excellent film strength

Inactive Publication Date: 2020-03-06
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the other hand, in a magnetic tape as a kind of magnetic recording medium, if the particles of ε-iron oxide are small, there is a problem that the film strength of the magnetic layer containing the particles of ε-iron oxide decreases.

Method used

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  • Beta-iron oxyhydroxide-based compound powder and sol, method of preparing epsilon-ferric oxide compound powder, and manufacturing method of magnetic recording medium
  • Beta-iron oxyhydroxide-based compound powder and sol, method of preparing epsilon-ferric oxide compound powder, and manufacturing method of magnetic recording medium
  • Beta-iron oxyhydroxide-based compound powder and sol, method of preparing epsilon-ferric oxide compound powder, and manufacturing method of magnetic recording medium

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Effect test

Embodiment 1～9 and comparative example 1～2

[0737] 1. Preparation of composition for forming magnetic layer

[0738] The composition for forming a magnetic layer having the composition shown below was prepared by the following method.

[0739] First, use a batch vertical sand mill and use zirconia beads with a bead diameter of 0.5 mmφ (the first dispersed beads, density: 6.0 g / cm 3 ) Disperse the components of the magnetic fluid having the composition shown below for 24 hours (first dispersion).

[0740] Next, the dispersion obtained by the first dispersion was filtered using a filter with an average pore diameter of 0.5 μm, whereby a dispersion liquid A was obtained. In the first dispersion, a 10-fold amount of zirconia beads (first dispersion beads) was used on a mass basis with respect to the magnetic powder.

[0741] Next, use a batch vertical sand mill and use diamond beads with a bead diameter of 500 nmφ (the second dispersed beads, density: 3.5 g / cm 3 ) The dispersion A was dispersed for 1 hour (second dispersion).

[074...

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Abstract

The invention provides beta-iron oxyhydroxide-based compound powder and sol, a method of preparing epsilon-ferric oxide compound powder, and a manufacturing method of a magnetic recording medium, which can form the magnetic powder capable of being used for preparing the magnetic recording medium with excellent SNR and excellent film strength of a magnetic layer. According to the beta-iron oxyhydroxide-based compound powder and applications thereof, the beta-iron oxyhydroxide-based compound powder is an aggregation of beta-iron oxyhydroxide-based compound particles represented as the formula (I), wherein the surface of the beta-iron oxyhydroxide-based compound particles is modified by a surface modifier. When being dispersed in water to manufacture the sol, the powder has a zeta potential of more than +5 mV under the pH value of 10. In the formula (I), A refers to at least one metal element besides Fe, 0 <= a < 1. The formula (I): beta-AaFe1-aOOH.

Description

Technical field [0001] The present invention relates to a method for producing β-iron oxyhydroxide compound powder, β-iron oxyhydroxide compound sol, and ε-iron oxide compound powder and a method for producing a magnetic recording medium. Background technique [0002] In recent years, as the performance of magnetic recording media has increased, as a magnetic material used for magnetic recording media, ε-type iron oxide (hereinafter, also referred to as "ε") is a nano-sized particle and exhibits very high coercivity. -Fe 2 O 3 "Or "ε-iron oxide".) The particles are attracting attention. [0003] As a method of producing particles of ε-iron oxide, there is known a method of using particles of β-type iron oxyhydroxide (hereinafter, also referred to as "β-FeOOH" or "β-iron oxyhydroxide") as a raw material. [0004] For example, Patent Document 1 discloses a method for producing single-phase ε-iron oxide nanomagnetic particles from a sol of β-iron oxyhydroxide nanomagnetic particles wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00H01F1/00B82Y40/00
CPCC01G49/0018C01G49/009H01F1/00B82Y40/00C01P2004/64C01G49/02C01P2006/42C01G49/06G11B5/852C01P2004/04C01P2002/72
Inventor 藤本贵士
Owner FUJIFILM CORP
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