JPH03274278A - White magnetic powder and its production - Google Patents
White magnetic powder and its productionInfo
- Publication number
- JPH03274278A JPH03274278A JP2071818A JP7181890A JPH03274278A JP H03274278 A JPH03274278 A JP H03274278A JP 2071818 A JP2071818 A JP 2071818A JP 7181890 A JP7181890 A JP 7181890A JP H03274278 A JPH03274278 A JP H03274278A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- silver
- solution
- added
- metallic
- 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.)
- Granted
Links
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 229910052709 silver Inorganic materials 0.000 claims abstract description 43
- 239000004332 silver Substances 0.000 claims abstract description 43
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000243 solution Substances 0.000 claims abstract description 29
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 22
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- -1 silver ions Chemical class 0.000 claims abstract description 13
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 11
- 239000007864 aqueous solution Substances 0.000 claims abstract description 11
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims abstract description 6
- 239000008103 glucose Substances 0.000 claims abstract description 6
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims abstract description 5
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims abstract description 5
- 235000002906 tartaric acid Nutrition 0.000 claims abstract description 5
- 239000011975 tartaric acid Substances 0.000 claims abstract description 5
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 230000001376 precipitating effect Effects 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 4
- 150000002500 ions Chemical class 0.000 abstract 2
- 229910000531 Co alloy Inorganic materials 0.000 abstract 1
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 7
- 238000006722 reduction reaction Methods 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000012153 distilled water Substances 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229940095064 tartrate Drugs 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/18—Non-metallic particles coated with metal
Landscapes
- Developing Agents For Electrophotography (AREA)
- Powder Metallurgy (AREA)
- Chemically Coating (AREA)
- Hard Magnetic Materials (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は磁性カラートナーや磁性カラーインキの原料と
して有用な白色磁性粉体およびその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a white magnetic powder useful as a raw material for magnetic color toners and magnetic color inks, and a method for producing the same.
［従来の技術］
従来−成分磁性カラートナーに使用する磁性粉体として
は、金属コバルト・金属鉄・金属ニッケルなどの金属、
あるいはフェライト・酸化クロムなどの酸化物がもちい
られており、これらを顔料と樹脂に練り込み固結後粉砕
・分級して一成分磁性カラートナーとしている。[Conventional technology] Conventionally, the magnetic powders used in component magnetic color toners include metals such as metallic cobalt, metallic iron, metallic nickel, etc.
Alternatively, oxides such as ferrite and chromium oxide are used, which are kneaded into pigment and resin, solidified, and then crushed and classified to produce a one-component magnetic color toner.
［発明が解決しようとする課題］
しかしこれら磁性粉体は元来、黒色あるいは黒灰色であ
って、黒色以外のカラートナーに使用した場合には色を
純色にし、釘かな色の磁性カラートナーを得ることがで
きなかった。[Problems to be Solved by the Invention] However, these magnetic powders are originally black or black-gray, and when used in a color toner other than black, the color is made pure and a nail-colored magnetic color toner is used. I couldn't get it.
本発明はこのような事情に鑑みてさなされたもので、そ
の目的は鮮やかな色の磁性カラートナーに適する白色磁
性粉体とその製造方法を提供することにある。The present invention has been made in view of the above circumstances, and its object is to provide a white magnetic powder suitable for brightly colored magnetic color toners and a method for producing the same.
［課題を解決するための手段１ 上記目的は次の構成により達成される。[Means to solve the problem 1 The above object is achieved by the following configuration.
請求項■の発明は、磁性粉体を核として表面に金属銀被
膜を形成させた白色磁性粉体である。The invention of claim (2) is a white magnetic powder having a core of magnetic powder and a metallic silver coating formed on the surface.
請求項２の発明は、硝酸銀水溶液中の銀イオンをアンモ
ニアで錯イオン化した銀液に、磁性粉体を加えて分散さ
せ、水にブドウ糖と酒石酸およびアルコールを溶解した
還元液を加えて、前記磁性粉体の表面に金属銀被膜を還
元、析出させる白色磁性粉体の製造方法である。The invention according to claim 2 is characterized in that magnetic powder is added to and dispersed in a silver solution in which silver ions in a silver nitrate aqueous solution are complex ionized with ammonia, and a reducing solution in which glucose, tartaric acid, and alcohol are dissolved in water is added to make the magnetic powder. This is a method for producing white magnetic powder in which a metallic silver film is reduced and deposited on the surface of the powder.
［作用］
かかる構成においては、磁性粉体を核として表面に金属
銀の被膜が形成された鮮やかな色の磁性カラートナーに
適する白色磁性粉体が得られる。[Function] With this configuration, a white magnetic powder suitable for a brightly colored magnetic color toner having a magnetic powder core and a metallic silver coating formed on the surface can be obtained.
すなわちこのように磁性粉体の表面に金属銀被膜を形成
することにより、該被膜で磁性粉体の色を消すとともに
金属銀の性質である表面における散乱および反射を利用
して白色磁性粉体を得ることができる。In other words, by forming a metallic silver coating on the surface of magnetic powder in this way, the coating erases the color of the magnetic powder and utilizes the scattering and reflection properties of metallic silver on the surface to make white magnetic powder. Obtainable.
ちなみに特開平１−１１９０６２号公報には、粉体に導
電率を上げることを目的として金属銀を被覆することが
示されているが、その粉体が示す色については目的外で
あり、またこれについてなんらの検討もなされていない
。Incidentally, Japanese Patent Application Laid-Open No. 1-119062 discloses coating powder with metallic silver for the purpose of increasing conductivity, but the color of the powder is not the intended purpose, and this No consideration has been given to this.
また特開平１−２０８３２４号公報には、雲母にメタリ
ック光沢を持たせる目的で焼成還元法により銀被膜を形
成することが示されているが、高温で熱処理するため鉄
粉やマグネタイトのような酸化されやすい物質には不向
きである。これに対し本発明は常温で反応を行うため、
磁性粉体を酸化させることなく金属銀被膜を有する白色
磁性粉体を容易に得ることができるという利点がある。Furthermore, Japanese Patent Application Laid-open No. 1-208324 discloses that a silver coating is formed by a baking reduction method in order to give mica a metallic luster. It is not suitable for substances that are easily exposed. In contrast, the present invention performs the reaction at room temperature, so
There is an advantage that white magnetic powder having a metallic silver coating can be easily obtained without oxidizing the magnetic powder.
次に白色磁性粉体の製造方法の一例を第１図フローチャ
ートを用いて説明する。Next, an example of a method for producing white magnetic powder will be explained using the flowchart of FIG.
水１０１００Ｏにブドウ糖２０〜１５０ｇと酒石酸１．
５〜１４ｇを８０〜１００℃のウォーターバス中で湯浴
させながら順次溶解し１０分以上保持する。これを室温
まで冷却したあとアルコール５０〜２０００ ｍｌを添
加する。この際のアルコール添加量が５０ｍ１より少な
いと還元反応が起こらないことがあり、多すぎると銀を
還元するのに必要なブドウ糖および酒石酸イオンの濃度
を低くして反応が起こらないことがある。得られた混合
物を還元液とする。アルコールはメタノールでもエタノ
ールでも両者の混合物でも使用可能である。Water 10100O, glucose 20-150g and tartaric acid 1.
5 to 14 g are sequentially dissolved in a water bath at 80 to 100°C and held for 10 minutes or more. After cooling this to room temperature, 50-2000 ml of alcohol is added. If the amount of alcohol added at this time is less than 50 ml, the reduction reaction may not occur, and if it is too large, the concentration of glucose and tartrate ions necessary to reduce silver may be lowered and the reaction may not occur. The resulting mixture is used as a reducing solution. The alcohol can be methanol, ethanol, or a mixture of both.
次に、硝酸銀１００ｇにアンモニア水溶液（２８％）を
硝酸銀が完全に溶解するまで加え、その抜水１〜４１を
添加する。この際加える水の量が少ないとｐＨが下がっ
て銀が再び錯体として沈殿することがあり、多すぎると
銀の濃度が下がるため還元液と混ぜたときに充分な厚さ
の被膜を得られないことがある。このとき硝酸銀を先に
水に溶解し、その後でアンモニア水を添加してもよい。Next, an ammonia aqueous solution (28%) is added to 100 g of silver nitrate until the silver nitrate is completely dissolved, and the drained water 1 to 41 are added. If the amount of water added at this time is small, the pH will drop and the silver may precipitate again as a complex; if it is too large, the concentration of silver will drop, making it impossible to obtain a film of sufficient thickness when mixed with the reducing solution. Sometimes. At this time, silver nitrate may be dissolved in water first, and then aqueous ammonia may be added.
次に０．５〜２規定の水酸化ナトリウム水溶液１〜４１
を添加すると黒あるいは黒褐色の錯体が沈殿する。この
黒色の沈殿が無くなるまで十分に攪拌しながらアンモニ
ア水溶液（２８％）を添加して銀酸とする。Next, 0.5-2N sodium hydroxide aqueous solution 1-41
When added, a black or dark brown complex precipitates. Ammonia aqueous solution (28%) is added to the mixture with sufficient stirring until this black precipitate disappears to obtain silver acid.
上記により得られた銀酸に核となる磁性粉体を加える。A magnetic powder serving as a core is added to the silver acid obtained above.
その添加量は形成する金属銀被膜の厚みおよび磁性粉体
の色や粒径に依存するので、硝酸銀１００ｇに対し５〜
５００ｇが適当である。磁性粉体の量が少なすぎると金
属銀被膜が厚くなりすぎて白色磁性粉体の磁化を小さく
してしまう。The amount added depends on the thickness of the metallic silver coating to be formed and the color and particle size of the magnetic powder, so it is 5 to 50% per 100g of silver nitrate.
500g is appropriate. If the amount of magnetic powder is too small, the metal silver coating will become too thick, reducing the magnetization of the white magnetic powder.
逆に多すぎると金属銀被膜が薄くなりすぎて暗灰色の磁
性粉体となってしまう。On the other hand, if it is too large, the metallic silver coating becomes too thin, resulting in dark gray magnetic powder.
本発明に用いられる磁性粉体としては、金属鉄・金属コ
バルト・金属ニッケルなどの磁性金属やそれらの合金か
らなる粉体、あるいはマグネタイトやＭｎフェライトな
どの磁性酸化物粉体であってその粒径は０．０５〜２０
μｍが適当である。The magnetic powder used in the present invention is powder made of magnetic metals such as metallic iron, metallic cobalt, and metallic nickel, or their alloys, or magnetic oxide powder such as magnetite or Mn ferrite, and the particle size thereof is is 0.05~20
μm is appropriate.
磁性粉体を添加後十分に攪拌するが、できるだけ高速で
行い、あるいは超音波洗浄機などを用いて十分に分散さ
せるほうが望ましい。十分、分散させた後銀液と同容量
の還元液を添加し還元反応が終るまで１〜３０分、好ま
しくは３〜１５分攪拌し、磁性粉体の表面に金属銀被膜
を形成させる。After adding the magnetic powder, stir thoroughly, but it is preferable to stir as fast as possible or use an ultrasonic cleaner or the like to sufficiently disperse the powder. After sufficient dispersion, a reducing solution of the same volume as the silver solution is added and stirred for 1 to 30 minutes, preferably 3 to 15 minutes, until the reduction reaction is completed, thereby forming a metallic silver film on the surface of the magnetic powder.
この際の反応時間が１分より短いと十分な被膜が得られ
ないことがあり、３０分ぐらい経過すると金属銀の析出
が完了してしまう。If the reaction time at this time is shorter than 1 minute, a sufficient film may not be obtained, and the precipitation of metallic silver will be completed after about 30 minutes.
固形分を濾過し、洗浄を繰返して十分にアンモニアイオ
ンを除去する。この際十分にアンモニアイオンを取除か
なければアンモニアと銀が反応し金属銀被膜の色の悪化
をまねくことがある。The solid content is filtered and washing is repeated to sufficiently remove ammonia ions. If ammonia ions are not sufficiently removed at this time, ammonia and silver may react, resulting in deterioration of the color of the metallic silver coating.
次にこの濾過ケーキを真空乾燥し白色磁性粉体を得る。Next, this filter cake is vacuum dried to obtain white magnetic powder.
［実施例］
以下、本発明の実施例および比較例をあげてさらに具体
的に説明する。[Example] Hereinafter, the present invention will be described in more detail by giving examples and comparative examples.
なお、各実施例および比較例はいずれも下記還元液と銀
液を用いた。In each of the Examples and Comparative Examples, the following reducing solution and silver solution were used.
水１０００ ｍｌにブドウ糖４５ｇと酒石酸４ｇ。45g glucose and 4g tartaric acid in 1000ml water.
メタノール１００ｍ１を溶解し、これを１週間室温で保
存し還元液とした。100 ml of methanol was dissolved, and this was stored at room temperature for one week to obtain a reducing solution.
硝酸銀３．５ｇにアンモニア水溶液（２８％）を硝酸銀
が完全に溶解するまで加え、その抜水６０ｍ１を添加し
、さらに６０ｍ１の水に水酸化ナトリウム２．５ｇを溶
解した水溶液を添加し、さらにその時にできる黒色の沈
殿が無くなるまでアンモニア水溶液（２８％）を添加し
て銀液とした。Ammonia aqueous solution (28%) was added to 3.5 g of silver nitrate until the silver nitrate was completely dissolved, 60 ml of the drained water was added, and an aqueous solution of 2.5 g of sodium hydroxide dissolved in 60 ml of water was added, and then An ammonia aqueous solution (28%) was added until the black precipitate that formed disappeared.
得られた白色磁性粉体の性状、色、磁化等を表１に示す
。なお参考として原料に使用した磁性粉体（マグネタイ
トおよびカルボニル鉄粉）の性状なども併記した。Table 1 shows the properties, color, magnetization, etc. of the obtained white magnetic powder. For reference, the properties of the magnetic powders (magnetite and carbonyl iron powder) used as raw materials are also listed.
ここで０度はＣＩＥＬＡＢ標準表色系標準表色事位はｅ
ｍｕ／ｇ（室温・１０ｋＯｅ）、粒径の単位はμｍであ
る。Here, 0 degrees is CIELAB standard color system standard color system position is e
mu/g (room temperature, 10 kOe), the unit of particle size is μm.
実施例１
上記銀液１３０ ｍｌに磁性粉体として平均粒径３μｍ
の釜石鉱山産マグネタイト７．０ｇを加え、攪拌し十分
に分散させた。このマグネタイトを分散させた銀液と同
容量の還元液を添加し、還元反応が終るまで１０分間攪
押抜濾過し、蒸留水を用いて５回洗浄して十分にアンモ
ニアイオンを除去した。これを真空乾燥し白色磁性粉体
Ａを得た。Example 1 Add magnetic powder with an average particle size of 3 μm to 130 ml of the above silver solution.
7.0 g of magnetite from Kamaishi Mine was added and stirred to fully disperse it. A reducing solution of the same volume as the silver solution in which magnetite was dispersed was added, and the solution was stirred and filtered for 10 minutes until the reduction reaction was completed, and washed five times with distilled water to sufficiently remove ammonia ions. This was vacuum dried to obtain white magnetic powder A.
実施例２
上記銀液１３０ｍ１に市販のカルボニル鉄粉３゜５ｇを
加え、攪拌し十分に分散させた。これに銀液と同容量の
還元液を添加し還元反応が終るまで１０分間攪押抜濾過
し、蒸留水を用いて５回洗浄して十分にアンモニアイオ
ンを除去した。これを真空乾燥し白色磁性粉体Ｂを得た
。Example 2 3.5 g of commercially available carbonyl iron powder was added to 130 ml of the above silver solution and stirred to sufficiently disperse it. A reducing solution of the same volume as the silver solution was added thereto, and the mixture was stirred and filtered for 10 minutes until the reduction reaction was completed, and washed five times with distilled water to sufficiently remove ammonia ions. This was vacuum dried to obtain white magnetic powder B.
実施例３
上記銀液１３０ｍ１に市販のカルボニル鉄粉７゜０ｇを
加え、攪拌し十分に分散させた。これに銀液と同容量の
還元液を添加し還元反応が終るまで１０分間攪押抜濾過
し、蒸留水を用いて５回洗浄して十分にアンモニアイオ
ンを除去した。これを真空乾燥し白色磁性粉体Ｃを得た
。Example 3 7.0 g of commercially available carbonyl iron powder was added to 130 ml of the above silver solution and stirred to sufficiently disperse the powder. A reducing solution of the same volume as the silver solution was added thereto, and the mixture was stirred and filtered for 10 minutes until the reduction reaction was completed, and washed five times with distilled water to sufficiently remove ammonia ions. This was vacuum dried to obtain white magnetic powder C.
比較例
上記銀液１３０ｍ１にカルボニル鉄粉２０．０ｇを加え
攪拌し十分に分散させた後、銀液と同容量の還元液を添
加し還元反応が終るまで１０分間攪押抜濾過し、蒸留水
を用いて５回洗浄して十分にアンモニアイオンを除去し
た。これを真空乾燥し白色磁性粉体りを得た。Comparative Example 20.0 g of carbonyl iron powder was added to 130 ml of the above silver solution, stirred, and sufficiently dispersed. Then, a reducing solution of the same volume as the silver solution was added, and the mixture was stirred and filtered for 10 minutes until the reduction reaction was completed, followed by distilled water. The ammonia ions were sufficiently removed by washing the sample 5 times. This was vacuum dried to obtain white magnetic powder.
表 １
［発明の効果コ
本発明の白色磁性粉体は、鮮やかな色の磁性カラートナ
ーに適するものであり、また本発明の製造方法によれば
磁性カラートナーに適する高品質の白色磁性粉体を容易
に得ることができるので工集的価値は大なるものである
。Table 1 [Effects of the Invention] The white magnetic powder of the present invention is suitable for producing brightly colored magnetic color toners, and according to the production method of the present invention, high quality white magnetic powders suitable for magnetic color toners can be obtained. can be easily obtained, so it has great engineering value.
第１図は本発明の製造方法の一例を示すフローチャート
の図、第２図は実施例２で得られた白色磁性粉体の粒子
構造を示す電子顕微鏡写真である。
第１図FIG. 1 is a flowchart showing an example of the manufacturing method of the present invention, and FIG. 2 is an electron micrograph showing the particle structure of the white magnetic powder obtained in Example 2. Figure 1
Claims (2)
ことを特徴とする白色磁性粉体。(1) A white magnetic powder characterized by having a core of magnetic powder and a metallic silver coating formed on its surface.
ン化した銀液に、磁性粉体を加えて分散させ、水にブド
ウ糖と酒石酸およびアルコールを溶解した還元液を加え
、前記磁性粉体の表面に金属銀被膜を還元、析出させる
ことを特徴とする白色磁性粉体の製造方法。(2) Magnetic powder is added and dispersed in a silver solution in which silver ions in a silver nitrate aqueous solution are complex ionized with ammonia, and a reducing solution prepared by dissolving glucose, tartaric acid, and alcohol in water is added to the surface of the magnetic powder. A method for producing white magnetic powder, characterized by reducing and precipitating a metallic silver film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2071818A JP3056503B2 (en) | 1990-03-23 | 1990-03-23 | White magnetic powder and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2071818A JP3056503B2 (en) | 1990-03-23 | 1990-03-23 | White magnetic powder and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03274278A true JPH03274278A (en) | 1991-12-05 |
| JP3056503B2 JP3056503B2 (en) | 2000-06-26 |
Family
ID=13471517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2071818A Expired - Lifetime JP3056503B2 (en) | 1990-03-23 | 1990-03-23 | White magnetic powder and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3056503B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0609897A2 (en) * | 1993-02-05 | 1994-08-10 | Nittetsu Mining Co., Ltd. | Powder having at least one layer and process for preparing the same |
| WO1997048024A1 (en) * | 1996-06-10 | 1997-12-18 | Nittetsu Mining Co., Ltd. | Colored magnetic toner and process for preparing the same |
| WO2003076526A1 (en) | 2002-03-14 | 2003-09-18 | Nittetsu Mining Co., Ltd. | Coated powder, coating composition, and coated article |
| US10350933B2 (en) | 2007-06-05 | 2019-07-16 | Bank Of Canada | Ink or toner compositions, methods of use, and products derived therefrom |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100507074C (en) * | 2007-02-02 | 2009-07-01 | 广东工业大学 | Compounded conducting mix and silver coating Fe*O* powder and preparation method thereof |
-
1990
- 1990-03-23 JP JP2071818A patent/JP3056503B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0609897A2 (en) * | 1993-02-05 | 1994-08-10 | Nittetsu Mining Co., Ltd. | Powder having at least one layer and process for preparing the same |
| EP0609897A3 (en) * | 1993-02-05 | 1994-08-24 | Nittetsu Mining Co., Ltd. | Powder having at least one layer and process for preparing the same |
| US5763085A (en) * | 1993-02-05 | 1998-06-09 | Nittetsu Mining Co., Ltd. | Powder having at least one layer and process for preparing the same |
| WO1997048024A1 (en) * | 1996-06-10 | 1997-12-18 | Nittetsu Mining Co., Ltd. | Colored magnetic toner and process for preparing the same |
| WO2003076526A1 (en) | 2002-03-14 | 2003-09-18 | Nittetsu Mining Co., Ltd. | Coated powder, coating composition, and coated article |
| US10350933B2 (en) | 2007-06-05 | 2019-07-16 | Bank Of Canada | Ink or toner compositions, methods of use, and products derived therefrom |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3056503B2 (en) | 2000-06-26 |
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