JPH01281706A - Surface treatment of magnetic metal powder - Google Patents
Surface treatment of magnetic metal powderInfo
- Publication number
- JPH01281706A JPH01281706A JP63110352A JP11035288A JPH01281706A JP H01281706 A JPH01281706 A JP H01281706A JP 63110352 A JP63110352 A JP 63110352A JP 11035288 A JP11035288 A JP 11035288A JP H01281706 A JPH01281706 A JP H01281706A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic metal
- metal powder
- benzoic acid
- acid derivative
- iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 title claims abstract description 47
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 47
- 239000000843 powder Substances 0.000 title claims abstract description 47
- 238000004381 surface treatment Methods 0.000 title claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 20
- -1 benzoic acid derivative compound Chemical class 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 239000002635 aromatic organic solvent Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 10
- 125000001424 substituent group Chemical group 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 8
- ALYNCZNDIQEVRV-UHFFFAOYSA-N 4-aminobenzoic acid Chemical compound NC1=CC=C(C(O)=O)C=C1 ALYNCZNDIQEVRV-UHFFFAOYSA-N 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 abstract description 4
- ZEYHEAKUIGZSGI-UHFFFAOYSA-N 4-methoxybenzoic acid Chemical compound COC1=CC=C(C(O)=O)C=C1 ZEYHEAKUIGZSGI-UHFFFAOYSA-N 0.000 abstract description 2
- 229960004050 aminobenzoic acid Drugs 0.000 abstract description 2
- IOHPVZBSOKLVMN-UHFFFAOYSA-N 2-(2-phenylethyl)benzoic acid Chemical compound OC(=O)C1=CC=CC=C1CCC1=CC=CC=C1 IOHPVZBSOKLVMN-UHFFFAOYSA-N 0.000 abstract 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 21
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 239000006247 magnetic powder Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000003973 paint Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- AFPHTEQTJZKQAQ-UHFFFAOYSA-N 3-nitrobenzoic acid Chemical compound OC(=O)C1=CC=CC([N+]([O-])=O)=C1 AFPHTEQTJZKQAQ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- OTLNPYWUJOZPPA-UHFFFAOYSA-N 4-nitrobenzoic acid Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C=C1 OTLNPYWUJOZPPA-UHFFFAOYSA-N 0.000 description 1
- 229920002799 BoPET Polymers 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 150000001558 benzoic acid derivatives Chemical class 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/061—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder with a protective layer
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
- Paints Or Removers (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分骨〉
本発明は、磁性金属粉末の耐酸化性及び分散性を向上さ
せるための磁性金属粉末の表面処理法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Applications> The present invention relates to a method for surface treatment of magnetic metal powder to improve its oxidation resistance and dispersibility.
〈従来の技術〉
従来、オーディオテープ、ビデオテープなどの磁気テー
プ等の磁性粉末としては主に酸化鉄系磁性粉末が用いら
れていたが、近年、磁気テープの高性能化の要求に対応
するために鉄又は鉄を主体とする磁性金属粉末が用いら
れるようになってきた。しかし、この磁性金属粉末は、
従来の酸化鉄系磁性粉末と比較した場合優れた磁性特性
を有しているが、金属粉であるため化学的に不安定であ
るという欠点を有している。すなわち、磁性金属粉末は
空気中にて酸化され易いので場合によっては発火の危険
があるとともに、得られた磁気テープ等の磁気特性が経
時的に低下してしまうという問題がある。又、磁性金属
粉末は酸化鉄系磁性粉末と較べて凝集し易いので、例え
ば磁気テープ製造における塗料化の際に分散性が悪いと
いう問題がある。<Conventional technology> In the past, iron oxide-based magnetic powders were mainly used as magnetic powders for magnetic tapes such as audio tapes and video tapes, but in recent years, iron oxide-based magnetic powders have been used to meet the demand for higher performance magnetic tapes. Iron or magnetic metal powders mainly composed of iron have come to be used. However, this magnetic metal powder
Although it has superior magnetic properties when compared to conventional iron oxide magnetic powder, it has the disadvantage of being chemically unstable because it is a metal powder. That is, since magnetic metal powder is easily oxidized in the air, there is a risk of ignition in some cases, and there is a problem that the magnetic properties of the obtained magnetic tape etc. deteriorate over time. Furthermore, since magnetic metal powders tend to aggregate more easily than iron oxide-based magnetic powders, there is a problem of poor dispersibility when, for example, they are made into paints for manufacturing magnetic tapes.
そこで、従来においては発火を防止し且つ安定化するた
めに磁性金属粉末を気相あるいは液相にて徐々に酸化し
て粒子表面に緻密な酸化皮膜を形成しており、さらに耐
酸化性を高めるとともに分散性を向上させるための表面
処理法が種々検討されている。例えば、特開昭４９−９
７７３８号公報には金属磁性粉末と高級脂肪酸粉末とを
有機溶剤中で撹拌混合することにより粒子表面に高級脂
肪酸基膜を形成する方法が開示されている。Therefore, in the past, in order to prevent and stabilize ignition, magnetic metal powder was gradually oxidized in the gas or liquid phase to form a dense oxide film on the particle surface, which further increased the oxidation resistance. At the same time, various surface treatment methods have been studied to improve dispersibility. For example, JP-A-49-9
Japanese Patent No. 7738 discloses a method of forming a higher fatty acid base film on the particle surface by stirring and mixing metal magnetic powder and higher fatty acid powder in an organic solvent.
一方、短波長記録による高記録密度化の流れの中で磁性
金属粉末の微細化が進められているが、磁性金属粉末に
おいては微細になればなるほど酸化され易くなるととも
に分散しにくくなるという問題がある。よって、微細化
された磁性金属粉末、例えば比表面積５５ｍ”７６以上
の高比表面積を有する磁性金属粉末においては上述した
ような表面処理では対処できないというのが現状である
。On the other hand, with the trend toward higher recording densities through shorter wavelength recording, magnetic metal powders are being made finer, but the problem with magnetic metal powders is that the finer they become, the more easily they are oxidized and the more difficult they are to disperse. be. Therefore, the current situation is that fine magnetic metal powder, for example, magnetic metal powder having a high specific surface area of 55 m''76 or more, cannot be treated with the above-mentioned surface treatment.
本発明はこのような事情に鑑み、高比表面積の磁性金属
粉末に対しても耐酸化性及び分散性の双方を向上させる
ことができる磁性金属粉末の表面処理法を提供すること
を目的とする。In view of these circumstances, an object of the present invention is to provide a surface treatment method for magnetic metal powder that can improve both oxidation resistance and dispersibility even for magnetic metal powder with a high specific surface area. .
＜ａ題を解決するための手段〉
前記目的を達成する本発明の構成は鉄又は鉄を主体とす
る磁性金属粉末をメタ位又はパラ位に置換基を有する安
息香酸誘導体化合物（以下、単に置換安息香酸誘導体化
合物と略す）で表面処理することを特徴とする。<Means for solving problem a> The structure of the present invention to achieve the above object is to prepare a benzoic acid derivative compound having a substituent at the meta or para position (hereinafter simply referred to as a substituted It is characterized by surface treatment with a benzoic acid derivative compound (abbreviated as benzoic acid derivative compound).
本発明では、置換安息香酸誘導体化合物を用いて常法に
より磁性金属粉末の表面処理を行えばいいのであるが、
好適には置換安息香酸誘導体化合物を芳香族有機溶媒に
溶解又は分散した処理液中に磁性金属粉末を浸漬するこ
とによって行うのがよい。In the present invention, the magnetic metal powder can be surface-treated by a conventional method using a substituted benzoic acid derivative compound.
Preferably, the magnetic metal powder is immersed in a treatment liquid in which a substituted benzoic acid derivative compound is dissolved or dispersed in an aromatic organic solvent.
本発明で用いる置換安息香酸誘導体化合物としては、例
丸ば、Ｐ−アミノ安息香酸、Ｐ−メトキシ安息香酸、Ｐ
−ｔａｒｔ−ブチル安息香酸、ｍ−ニトロ安息香酸、Ｐ
−ニトロ安息香酸等を挙げることができる。この置換安
息香酸誘導体化合物は表面処理された磁性金属粉末重量
に対して０．１〜７重量％、好ましくは３〜５重量％と
なる量を用いるのがよい。Examples of the substituted benzoic acid derivative compounds used in the present invention include Maruba, P-aminobenzoic acid, P-methoxybenzoic acid, P-
-tart-butylbenzoic acid, m-nitrobenzoic acid, P
-Nitrobenzoic acid and the like. This substituted benzoic acid derivative compound is preferably used in an amount of 0.1 to 7% by weight, preferably 3 to 5% by weight, based on the weight of the surface-treated magnetic metal powder.
これは０．１重量％未満では表面処理効果が不十分であ
り、７重量％を超えて用いても増量効果がみられないか
らである。This is because if it is less than 0.1% by weight, the surface treatment effect is insufficient, and if it is used in excess of 7% by weight, no increase in weight is observed.
また、本発明方法が適用できる磁性金属粉末としては鉄
又は鉄を主体としてこれにＮ１゜Ｇｏ、Ｚｎ、Ｍｎ、Ｃ
ｒ、Ｍｇ、Ｐ、Ａｊ、Ｓｉ等を少なくとも１種以上添加
したものなどがあるが、この磁性金属粉末は酸化皮膜形
成前のものでもよいし、常法により全体にあるいは部分
的に酸化皮膜を形成したものでもよい。In addition, the magnetic metal powder to which the method of the present invention can be applied is mainly iron or iron, in addition to N1°Go, Zn, Mn, and C.
There are magnetic metal powders to which at least one of r, Mg, P, Aj, Si, etc. is added, but this magnetic metal powder may be before the formation of an oxide film, or it may be completely or partially coated with an oxide film by a conventional method. It may also be a formed one.
ここで、置換安息香酸誘導体化合物を芳香族有機溶媒に
溶解・分散した処理液中に磁性金属粉末を浸漬すること
により行う表面処理法について説明する。Here, a surface treatment method performed by immersing magnetic metal powder in a treatment liquid in which a substituted benzoic acid derivative compound is dissolved and dispersed in an aromatic organic solvent will be described.
置換安息香酸誘導体化合物を溶解・分散するための芳香
族有機溶媒としては例えば、ベンゼン、トルエン、キシ
レン等がある。これら溶媒を用いて処理液を調製する場
合には、置換安息香酸誘導体化合物が表面処理された磁
性金属粉末重量に対して上述したように０．１〜７重量
％、好ましくは３〜５重量％となるようにする。この処
理液による磁性金属粉末の処理２０℃以上で行うのがよ
い。この処理は０．５〜１０時間、好ましくは１〜５時
間程度浸漬した後磁性金属粉末を取り出して乾燥するこ
とにより行ってもよいし、磁性金属粉末を浸漬している
処理液から溶媒を蒸発・留去し、全て留去した後取り出
すようにしてもよい。Examples of the aromatic organic solvent for dissolving and dispersing the substituted benzoic acid derivative compound include benzene, toluene, and xylene. When preparing a treatment liquid using these solvents, the substituted benzoic acid derivative compound is 0.1 to 7% by weight, preferably 3 to 5% by weight, based on the weight of the surface-treated magnetic metal powder. Make it so that The treatment of magnetic metal powder with this treatment liquid is preferably carried out at a temperature of 20° C. or higher. This treatment may be carried out by immersing the magnetic metal powder for 0.5 to 10 hours, preferably 1 to 5 hours, then taking it out and drying it, or by evaporating the solvent from the treatment liquid in which the magnetic metal powder is immersed. - You may distill it off and take it out after all of it has been distilled off.
さらに、この表面処理法を実施する場合には磁性金属粉
末として酸化膜形成前のものを用い、該磁性金属粉末が
浸漬された処理液に酸素含有ガスを導入することにより
、表面処理及び酸化皮膜形成を同時に行うようにするの
が好適である。Furthermore, when carrying out this surface treatment method, the magnetic metal powder is used before oxide film formation, and by introducing an oxygen-containing gas into the treatment solution in which the magnetic metal powder is immersed, surface treatment and oxide film formation are performed. Preferably, the formation takes place simultaneously.
く実 施 例〉 以下に本発明の実施例を詳細に説明する。Practical example Examples of the present invention will be described in detail below.
（実施例１）
■ 表面処理
Ｐ−ｔａｒｔ−ブチル安息香酸３０ｇをトルエン３１中
に溶解して処理液を調製し、この処理液に酸化皮膜形成
後の磁性金属粉末（長軸０．１５）ｔｍ 、軸比７〜１
０、比表面積６０ ｍ’／ ｇ ）１ ｋｇを浸漬し、
−晩装置した。次にとの浸漬液を内容積２０１のステン
レス製密閉容簡に全量を投入し、内部温度を６０℃に保
持しつつ５％酸素含有ガスを２０１／分の流量で処理液
中に導入することにより溶媒を完全に蒸発させて表面処
理された磁性金属粉末を取り出し、乾燥した。(Example 1) ■ Surface treatment A treatment solution was prepared by dissolving 30 g of P-tart-butylbenzoic acid in 31 toluene, and magnetic metal powder (major axis 0.15) tm after oxide film formation was added to the treatment solution. , axial ratio 7~1
0, specific surface area 60 m'/g) 1 kg is immersed,
- It was installed in the evening. Next, the entire amount of the immersion liquid was poured into a stainless steel airtight container with an internal volume of 201 cm, and while the internal temperature was maintained at 60°C, 5% oxygen-containing gas was introduced into the processing liquid at a flow rate of 201 min. The solvent was completely evaporated, and the surface-treated magnetic metal powder was taken out and dried.
この表面処理磁性金属粉末の磁性特性、比表面積及び′
＃４ｗｉ化性を測定した。この結果を第１表に示す。な
お、耐酸化性は表面処理磁性金属粉末を６０℃、９０％
ＲＨの空気中に暴露し、１週間経過後の飽和磁化を測定
し、この飽和磁化の暴露前の飽和磁化に対する劣化率（
ΔσＳ）で評価した。The magnetic properties, specific surface area and
#4 Widability was measured. The results are shown in Table 1. The oxidation resistance of surface-treated magnetic metal powder was measured at 60°C and 90%.
After one week of exposure to RH air, the saturation magnetization was measured and the deterioration rate of this saturation magnetization relative to the saturation magnetization before exposure (
ΔσS).
■ 磁気シートの作製
上記表面処理磁性金属粉末を用い、下記の組成でサンド
ミルにより分散塗料化した。(2) Preparation of magnetic sheet The surface-treated magnetic metal powder described above was used to form a dispersion coating using a sand mill using the following composition.
塗料組成
（重量部）
表面処理磁性金属粉末 １００ＶＡＧＨ（
塩ビ・酢ビ共重合体）１１
ポリウレタン樹脂 １ルシチン
２メチルエチルケトン
８０トルエン
８０シクロへキサノン
４０上述のようにして得た分散塗料をＰＥＴフィルム（
厚み１０μｍ）上に塗布し、次いで、永久磁石３０００
Ｇにより磁場配向させて乾燥し、磁性塗膜厚みが３μｍ
の磁気シートを掃な。Paint composition (parts by weight) Surface-treated magnetic metal powder 100VAGH (
PVC/vinyl acetate copolymer) 11 Polyurethane resin 1 Lucitin
2 Methyl ethyl ketone 80 Toluene
80cyclohexanone
40 The dispersion paint obtained as described above was applied to a PET film (
10 μm thick), then permanent magnet 3000
Magnetic field alignment using G and drying results in a magnetic coating film with a thickness of 3 μm.
Sweep the magnetic sheet.
得られた磁気シートの磁気特性を第２表に示す。The magnetic properties of the obtained magnetic sheet are shown in Table 2.
（実施例２）
ｍ−ニトロ安息香酸３０ｇをトルエン３１中に溶解して
処理液を調製し、以下実施例１と同様に操作した。この
結果を第１表及び第２表に示す。(Example 2) A treatment liquid was prepared by dissolving 30 g of m-nitrobenzoic acid in 31 parts of toluene, and the same procedure as in Example 1 was carried out. The results are shown in Tables 1 and 2.
（比較例１）
置換安息香酸誘導体化合物を添加せず、トルエンだけを
用いて実施例１と同様の条件で操作しｔコ。この結果を
第１表及び第２表に示す。(Comparative Example 1) A sample was operated under the same conditions as in Example 1 using only toluene without adding the substituted benzoic acid derivative compound. The results are shown in Tables 1 and 2.
（比較例２）
ステアリン酸４０ｇをトルエン５ｊ中に溶解して処理液
とした他は、実施例１と同様に操作した。この結果を第
１表及び第２表に示す。(Comparative Example 2) The same procedure as in Example 1 was carried out except that 40 g of stearic acid was dissolved in 5 j of toluene to prepare a treatment liquid. The results are shown in Tables 1 and 2.
第１表
第２表
第１表より、実施例１，２による表面処理磁性金属粉末
は比較例１，２のものと比べて劣化率が著しく小さ（な
っており、耐酸化性が向上しているのが認められた。ま
た磁気特性においても同等以上の値を示した。From Table 1 and Table 2, it can be seen that the surface-treated magnetic metal powders of Examples 1 and 2 had a significantly smaller deterioration rate than those of Comparative Examples 1 and 2, and had improved oxidation resistance. It was also observed that the magnetic properties were equivalent or higher.
また、実施例１，２の表面処理磁性金属粉末を用いて作
製した磁気シートにおいては比較例１，２のものに比べ
て特に角形比（Ｓｑ）が向上されているのが認められる
。すなわち、実施例１，２においては、空試験となる比
較例１に比べて０．０３、従来法による表面処理を行っ
た比較例２のものと比べて０．０１角形比が改善されて
いるが、これは塗料化の際の分散性が大きく向上してい
ることを示している。Furthermore, it is observed that the magnetic sheets produced using the surface-treated magnetic metal powders of Examples 1 and 2 have particularly improved squareness ratios (Sq) compared to those of Comparative Examples 1 and 2. That is, in Examples 1 and 2, the squareness ratio was improved by 0.03 compared to Comparative Example 1, which was a blank test, and by 0.01 compared to Comparative Example 2, which was surface treated by the conventional method. However, this shows that the dispersibility when making into a paint is greatly improved.
また、実施例１，２の表面処理磁性金属粉末をトルエン
で洗浄してその洗浄液を分析したが、置換安息香酸誘導
体化合物は全く検出されなかった。これにより、磁性金
属粉末の表面において置換安息香酸誘導体化合物が強固
に保持されていることが確認された。Furthermore, when the surface-treated magnetic metal powders of Examples 1 and 2 were washed with toluene and the washing solution was analyzed, no substituted benzoic acid derivative compound was detected. This confirmed that the substituted benzoic acid derivative compound was firmly held on the surface of the magnetic metal powder.
〈発明の効果〉
以上、実施例とともに具体的に説明したように、本発明
方法によれば耐酸化性及び分散性が著しく向上した磁性
金属粉末を得ることができる。<Effects of the Invention> As described above in detail with Examples, according to the method of the present invention, magnetic metal powder with significantly improved oxidation resistance and dispersibility can be obtained.
Claims (2)
パラ位に置換基を有する安息香酸誘導体化合物で表面処
理することを特徴とする磁性金属粉末の表面処理法。(1) A method for surface treatment of magnetic metal powder, characterized in that iron or magnetic metal powder mainly composed of iron is surface treated with a benzoic acid derivative compound having a substituent at the meta or para position.
体化合物を芳香族有機溶媒に溶解又は分散した処理液に
磁性金属粉末を浸漬する特許請求の範囲第１項記載の磁
性金属粉末の表面処理法。(2) The surface of the magnetic metal powder according to claim 1, wherein the magnetic metal powder is immersed in a treatment liquid in which a benzoic acid derivative compound having a substituent at the meta or para position is dissolved or dispersed in an aromatic organic solvent. Processing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63110352A JPH01281706A (en) | 1988-05-09 | 1988-05-09 | Surface treatment of magnetic metal powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63110352A JPH01281706A (en) | 1988-05-09 | 1988-05-09 | Surface treatment of magnetic metal powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01281706A true JPH01281706A (en) | 1989-11-13 |
Family
ID=14533589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63110352A Pending JPH01281706A (en) | 1988-05-09 | 1988-05-09 | Surface treatment of magnetic metal powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01281706A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102240802A (en) * | 2010-05-12 | 2011-11-16 | 亚利桑那大学董事会 | Metallic magnetic powder and manufacturing method of the same, magnetic painting, magnetic powder for magnetic therapy, and magnetic recording medium |
-
1988
- 1988-05-09 JP JP63110352A patent/JPH01281706A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102240802A (en) * | 2010-05-12 | 2011-11-16 | 亚利桑那大学董事会 | Metallic magnetic powder and manufacturing method of the same, magnetic painting, magnetic powder for magnetic therapy, and magnetic recording medium |
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