JPS63299205A - Surface treatment of magnetic metal power - Google Patents
Surface treatment of magnetic metal powerInfo
- Publication number
- JPS63299205A JPS63299205A JP62131689A JP13168987A JPS63299205A JP S63299205 A JPS63299205 A JP S63299205A JP 62131689 A JP62131689 A JP 62131689A JP 13168987 A JP13168987 A JP 13168987A JP S63299205 A JPS63299205 A JP S63299205A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic metal
- metal powder
- surface treatment
- phenol
- treatment
- 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 59
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 59
- 238000004381 surface treatment Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 57
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 13
- -1 phenol compound Chemical class 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 239000002635 aromatic organic solvent Substances 0.000 claims abstract description 6
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 claims description 5
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 2
- 150000002989 phenols Chemical class 0.000 abstract description 8
- 239000006185 dispersion Substances 0.000 abstract description 4
- SZWBRVPZWJYIHI-UHFFFAOYSA-N 4-n-Hexylphenol Chemical compound CCCCCCC1=CC=C(O)C=C1 SZWBRVPZWJYIHI-UHFFFAOYSA-N 0.000 abstract description 3
- KJWMCPYEODZESQ-UHFFFAOYSA-N 4-Dodecylphenol Chemical compound CCCCCCCCCCCCC1=CC=C(O)C=C1 KJWMCPYEODZESQ-UHFFFAOYSA-N 0.000 abstract description 2
- NTDQQZYCCIDJRK-UHFFFAOYSA-N 4-octylphenol Chemical compound CCCCCCCCC1=CC=C(O)C=C1 NTDQQZYCCIDJRK-UHFFFAOYSA-N 0.000 abstract description 2
- QHPQWRBYOIRBIT-UHFFFAOYSA-N 4-tert-butylphenol Chemical compound CC(C)(C)C1=CC=C(O)C=C1 QHPQWRBYOIRBIT-UHFFFAOYSA-N 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 2
- 125000001931 aliphatic group Chemical group 0.000 abstract 2
- 230000003064 anti-oxidating effect Effects 0.000 abstract 2
- 229910052799 carbon Inorganic materials 0.000 abstract 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-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
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 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
- 230000000694 effects Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 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
- 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
- 239000002245 particle Substances 0.000 description 2
- WJQOZHYUIDYNHM-UHFFFAOYSA-N 2-tert-Butylphenol Chemical compound CC(C)(C)C1=CC=CC=C1O WJQOZHYUIDYNHM-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
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001965 increasing effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 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
- 229910052698 phosphorus Inorganic materials 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)
- Paints Or Removers (AREA)
- Powder Metallurgy (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
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 Application Field> 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
れろようになってきた。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 iron-based magnetic metal powders have come to be used for this purpose. 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
酸化性を高めろとともに分散性を向上させろための表面
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
有機溶剤中で攪拌亮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。Conventionally, in order to prevent and stabilize ignition, magnetic metal powder is gradually oxidized in the gas or liquid phase to form a dense oxide film on the particle surface, which further improves oxidation resistance. Various surface treatment methods have been studied to improve dispersibility as well as filtration. 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 combining 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’ ／ ｇ
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, finely divided magnetic metal powder, for example, a specific surface area of 55 m'/g
The current situation is that magnetic metal powder having such a high specific surface area 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
粉末に対しても耐醋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効果を提供するこ
とを目的とする。In view of these circumstances, the present invention aims to provide a surface treatment effect for magnetic metal powder that can improve both the rusting resistance and dispersibility even for magnetic metal powder with a high specific surface area. do.
〈問題点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ｐ位を炭素数４〜１２の脂肪族炭化水
素で置換したフェノール化合物で表面処理することを特
徴とする。<Means for solving the problems> The structure of the present invention that achieves the above object is a phenol compound in which iron or a magnetic metal powder mainly composed of iron is substituted at the p position with an aliphatic hydrocarbon having 4 to 12 carbon atoms. It is characterized by surface treatment.
本発明では、ｐ位を炭素数４〜１２の脂肪族炭化水素で
置換したフェノール化合物（以下「フェノール化合物」
という）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、好適にはフェノール化合物を芳
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, a phenol compound in which the p-position is substituted with an aliphatic hydrocarbon having 4 to 12 carbon atoms (hereinafter referred to as a "phenol compound")
The surface treatment of the magnetic metal powder can be carried out by a conventional method using a phenol compound, but it is preferably carried out by immersing the magnetic metal powder in a treatment liquid in which a phenolic compound is dissolved or dispersed in an aromatic organic solvent. It is better.
本発明で用いるフェノール化合物としてはｐ ｔｅｒ
ｔ−ブチルフェノール、ｐ −ｎ−ヘキシルフェノール
、ｐ−ｎ−オクチルフェノール１ｐ−ｎ−ドデシルフェ
ノール等を挙ケることができる。このフェノール化合物
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。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ちれ
ないからである。The phenolic compound used in the present invention is p ter
Examples include t-butylphenol, p-n-hexylphenol, p-n-octylphenol, and p-n-dodecylphenol. The amount of this phenolic compound is 0.1 to 7% based on the weight of the surface-treated magnetic metal powder.
It is advisable to use an amount of 3% to 5% by weight. This is because if the amount is less than 0.1% by weight, the surface treatment effect will be insufficient, and if it is used in excess of 7% by weight, the weight increasing effect will not be noticeable.
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Ｎｌ。Further, the magnetic metal powder to which the method of the present invention can be applied is iron or iron as a main component, and Nl is added to the iron.
Ｇｏ、Ｚｎ、Ｍｎ、Ｃｒ、Ｍｇ、Ｐ、Ａｊ、Ｓｔ等を少
なくとも１ａｌ１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。There are magnetic metal powders to which at least 1al1 or more of Go, Zn, Mn, Cr, Mg, P, Aj, St, etc. are added, but this magnetic metal powder may be before the formation of an oxide film, or it may be completely or partially added by a conventional method. A material with an oxide film formed thereon may also be used.
乞こで、フェノール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ととにより行
う表面処理法について説明する。A surface treatment method in which magnetic metal powder is immersed in a treatment liquid in which a phenol compound is dissolved and dispersed in an aromatic organic solvent will now be described.
フェノール化合物を溶解・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、
フェノール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１１液による磁性
金属粉末の処理は６０℃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 aromatic organic solvents for dissolving and dispersing phenolic compounds include benzene, toluene, and xylene. When preparing a processing solution using these solvents,
As mentioned above, the phenolic compound is present in an amount of 0.1 to 7% by weight, preferably 3% by weight based on the weight of the surface-treated magnetic metal powder.
~5% by weight. The treatment of the magnetic metal powder with liquid 11 is preferably carried out at 60° 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。Example of implementation Examples of the present invention will be described in detail below.
（実施例１）
■ 表面処理
ｐ−ｔｅｒｔ−ブチルフェノール６０ｇをトルエン３Ｉ
中に溶解して処理液を調製し、この処理液に酸化皮膜形
成前の磁性金属粉末（長軸０．１５μｍ、軸比７〜ｌＯ
１比表面積６０ｍ’／ ｇ） １ ｋｇ Ｊｅ浸漬し
、−晩装置した。次にこの浸漬液を内容積２０１のステ
ンレス製密閉容器に全量を投入し、内部温度を６０℃に
保持しつつ５％酸素含有ガスを２０ｊ／分の流量で処理
液中に導入することにより磁性金属粉末表面に酸化皮膜
を形成した。その後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 60g of p-tert-butylphenol was mixed with 3I toluene.
A treatment solution is prepared by dissolving the magnetic metal powder (major axis 0.15 μm, axial ratio 7 to 1O
1 specific surface area 60 m'/g) 1 kg Je was immersed and left overnight. Next, the entire amount of this 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 20 j/min. An oxide film was formed on the surface of the metal powder. Thereafter, 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、比表面積及び耐
酸化性を測定した。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（Δへ）
で評価した。The magnetic properties, specific surface area, and oxidation resistance of this surface-treated magnetic metal powder were measured. The results are shown in Table 1. The oxidation resistance is measured by exposing the surface-treated magnetic metal powder to air at 60°C and 90% RH, measuring the saturation magnetization after one week, and calculating the deterioration rate (Δ) of this saturation magnetization with respect to the saturation magnetization before exposure. fart)
It was evaluated by
■ 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.
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３０
００Ｇにより磁場配向させて乾燥し、磁性塗膜厚みが３
μｍの磁気シートを得た。Surface treatment 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 onto a PET film (thickness 10 μm), and then a permanent magnet 30
00G magnetic field orientation and drying, the thickness of the magnetic coating is 3.
A μm magnetic sheet was obtained.
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）
ｐ −ｎ−ヘキシルフェノール３０ｇをトルエン３ｅ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 p-n-hexylphenol in toluene 3e, and the following operations were carried out in the same manner as in Example 1. The results are shown in Tables 1 and 2.
（比較例１）
フェノール化合物を添加せず、トルエンだけを用いて実
施例１と同様の条件で操作した。(Comparative Example 1) Operation was carried out under the same conditions as in Example 1 using only toluene without adding a phenol compound.
この結果を第１表及び第２表に示す。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５Ｉ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 5I 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くな
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。Table 1 Table 2 Table 1 shows that the surface-treated magnetic metal powders according to Examples 1 and 2 have significantly lower deterioration rates and improved oxidation resistance than those of Comparative Examples 1 and 2. was recognized. The magnetic properties also showed equivalent or higher values.
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。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.
すなわち、実施例１，２においては、全試験となる比較
例１に比べて０．０４、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０．０２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。That is, in Examples 1 and 2, the squareness ratio is improved by 0.04 compared to Comparative Example 1, which is the entire test, and by 0.02 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ｔコ、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、フェノール化合
物は全く検出されなかった。これにより、磁性金属粉末
の表面においてフェノール化合物が強固に保持されてい
ることが確認された。When the surface-treated magnetic metal powders of Examples 1 and 2 were washed with toluene and the washing solution was analyzed, no phenolic compound was detected. This confirmed that the phenol 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.
特 許 出 願 人 三井金属鉱業株式会社 代 理 人Patent applicant Mitsui Metal Mining Co., Ltd. People
Claims (6)
数４〜１２の脂肪族炭化水素で置換したフェノール化合
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, which comprises treating iron or magnetic metal powder mainly composed of iron with a phenol compound in which the p-position is substituted with an aliphatic hydrocarbon having 4 to 12 carbon atoms.
たフェノール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) Magnetic metal powder is immersed in a treatment liquid in which a phenol compound in which the p-position is substituted with an aliphatic hydrocarbon having 4 to 12 carbon atoms is dissolved or dispersed in an aromatic organic solvent.
Surface treatment method for magnetic metal powder described in Section 1.
上である特許請求の範囲第２項記載の磁性金属粉末の表
面処理法。(3) The method for surface treatment of magnetic metal powder according to claim 2, wherein the treatment temperature of the magnetic metal powder with the treatment liquid is 60° C. or higher.
上として芳香族有機溶媒を蒸発・留去しながら処理する
特許請求の範囲第２項記載の磁性金属粉末の表面処理法
。(4) The surface treatment method for magnetic metal powder according to claim 2, wherein the magnetic metal powder is treated with the treatment liquid at a treatment temperature of 60° C. or higher while evaporating and distilling off the aromatic organic solvent.
る特許請求の範囲第２項、第３項あるいは第４項記載の
磁性金属粉末の表面処理法。(5) A method for surface treatment of magnetic metal powder according to claim 2, 3 or 4, wherein an oxygen-containing gas is introduced into the treatment liquid during surface treatment.
たフェノール化合物が表面処理された磁性金属粉末重量
に対して０．１〜７重量％である特許請求の範囲第１項
〜第５項の何れかに記載の磁性金属粉末の表面処理法。(6) The content of the phenol compound in which the p-position is substituted with an aliphatic hydrocarbon having 4 to 12 carbon atoms is 0.1 to 7% by weight based on the weight of the surface-treated magnetic metal powder. The method for surface treatment of magnetic metal powder according to any one of Item 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62131689A JPS63299205A (en) | 1987-05-29 | 1987-05-29 | Surface treatment of magnetic metal power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62131689A JPS63299205A (en) | 1987-05-29 | 1987-05-29 | Surface treatment of magnetic metal power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63299205A true JPS63299205A (en) | 1988-12-06 |
Family
ID=15063910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62131689A Pending JPS63299205A (en) | 1987-05-29 | 1987-05-29 | Surface treatment of magnetic metal power |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63299205A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010049754A (en) * | 2008-08-22 | 2010-03-04 | Fujifilm Corp | Surface modifier for powder, and magnetic paint and non-magnetic paint including the same |
-
1987
- 1987-05-29 JP JP62131689A patent/JPS63299205A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010049754A (en) * | 2008-08-22 | 2010-03-04 | Fujifilm Corp | Surface modifier for powder, and magnetic paint and non-magnetic paint including the same |
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