JPH05179302A - Surface treating agent for copper powder and treatment of surface of copper powder - Google Patents
Surface treating agent for copper powder and treatment of surface of copper powderInfo
- Publication number
- JPH05179302A JPH05179302A JP4018346A JP1834692A JPH05179302A JP H05179302 A JPH05179302 A JP H05179302A JP 4018346 A JP4018346 A JP 4018346A JP 1834692 A JP1834692 A JP 1834692A JP H05179302 A JPH05179302 A JP H05179302A
- Authority
- JP
- Japan
- Prior art keywords
- copper powder
- treating agent
- resistivity
- stearic acid
- oxidation resistance
- 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
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は銅粉用表面処理剤及び銅
粉表面の処理方法に関し、特に、電刷子の製造に用いる
のに適した銅粉を得るための銅粉表面の処理方法及び該
方法に用いる表面処理剤に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment agent for copper powder and a method for treating the surface of the copper powder, and more particularly, to a method for treating the surface of the copper powder for obtaining a copper powder suitable for use in the production of electric brushes. The present invention relates to a surface treatment agent used in the method.
【０００２】[0002]
【従来の技術】銅粉は焼結含油軸受、焼結機械部品、金
属黒鉛刷子（電刷子）等の製造に用いれており、最近は
電子材料、例えば電磁波シールド（ＥＭＩ）用導電塗料
等の分野にも用途が広がっている。特に、電解銅粉は電
気分解において陰極に樹枝状に析出したもので粉末冶金
等の用途に最適のものである。2. Description of the Related Art Copper powder is used in the production of sintered oil-impregnated bearings, sintered machine parts, metal graphite brushes (electric brushes), etc., and recently in the field of electronic materials such as conductive paints for electromagnetic wave shielding (EMI). The application is expanding. In particular, electrolytic copper powder is deposited in a dendritic manner on the cathode during electrolysis and is most suitable for powder metallurgy and other applications.
【０００３】現在、軸受、電刷子の製造に使用される銅
粉のための表面処理剤はベンゾトリアゾール（ＢＴＡ）
であり、この処理剤は銅粉の耐酸化性を改良する。Presently, a surface treatment agent for copper powder used in the production of bearings and electric brushes is benzotriazole (BTA).
This treating agent improves the oxidation resistance of the copper powder.
【０００４】[0004]
【発明が解決しようとする課題】しかし、ＢＴＡはベン
ゼン環を有しており、その二重結合に起因して、ＢＴＡ
で表面処理した銅粉の抵抗率を上げてしまう。電刷子の
製造に用いられる銅粉に求められる特性としては、主と
して抵抗率が低く、曲げ強度が大きく、耐酸化性が優れ
ていることが挙げられる。従って銅粉の表面処理剤とし
てＢＴＡを用いると、電刷子の製造に用いる銅粉に必要
な特性の一つが欠けることになる。However, BTA has a benzene ring, and due to its double bond, BTA
It increases the resistivity of the copper powder surface-treated. The properties required of the copper powder used in the production of the electric brush are mainly that the resistivity is low, the bending strength is large, and the oxidation resistance is excellent. Therefore, when BTA is used as a surface treatment agent for copper powder, one of the characteristics required for the copper powder used for manufacturing electrophotographic brushes is lacking.
【０００５】本発明の目的は、抵抗率が低く且つ耐酸化
性に優れた銅粉を得るための銅粉表面の処理方法及び該
方法に用いる表面処理剤を提供することにある。An object of the present invention is to provide a method of treating a copper powder surface for obtaining a copper powder having a low resistivity and excellent oxidation resistance, and a surface treating agent used in the method.
【０００６】本発明の具体的な目的は、電刷子の製造に
用いるのに特に適した銅粉を提供することにある。A particular object of the invention is to provide a copper powder which is particularly suitable for use in the production of electrobrushes.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記目的
を達成するために種々検討を重ねた結果、酢酸鉛にステ
アリン酸鉛及びステアリン酸の少なくとも一種を加えて
得た処理剤を用いて銅粉の表面を処理すると、銅粉の耐
酸化性が改善され且つ抵抗率が増大しないことを見出
し、本発明を完成した。As a result of various studies to achieve the above object, the present inventors have used a treatment agent obtained by adding lead stearate and at least one of stearic acid to lead acetate. It was found that the oxidation resistance of the copper powder is improved and the resistivity does not increase when the surface of the copper powder is treated with the above method, and the present invention has been completed.
【０００８】本発明の銅粉用表面処理剤はステアリン酸
鉛及びステアリン酸の少なくとも一種１重量部と酢酸鉛
２〜１０重量部とからなることを特徴とする。The surface-treating agent for copper powder of the present invention is characterized by comprising 1 part by weight of lead stearate and at least one of stearic acid and 2 to 10 parts by weight of lead acetate.
【０００９】また、本発明の銅粉表面の処理方法は銅粉
表面を、ステアリン酸鉛及びステアリン酸の少なくとも
一種１重量部と酢酸鉛２〜１０重量部とからなる処理剤
で処理することを特徴とする。In the method for treating the surface of copper powder according to the present invention, the surface of the copper powder is treated with a treatment agent comprising lead stearate and at least one part by weight of stearic acid and 2-10 parts by weight of lead acetate. Characterize.
【００１０】銅粉を電刷子の製造に用いる場合に、その
銅粉の抵抗率が低ければ低いほど、その得られた電刷子
を使用した際の発熱を抑え、電力の消費を少なくするこ
とができる。しかし、銅粉の耐酸化性を改善しながらし
かも抵抗率を低くしようとしても、低くできる抵抗率の
値にも限度があり、現状では２２μΩ・ｃｍ程度以下で
あることが望まれている。従ってこの程度の抵抗率値を
保持しながらしかも耐酸化性（酸化重量増、酸化外観）
を改善することが必要である。When copper powder is used in the production of an electric brush, the lower the resistivity of the copper powder, the less the heat generated when using the obtained electric brush, and the less the power consumption. it can. However, even if an attempt is made to reduce the resistivity while improving the oxidation resistance of the copper powder, there is a limit to the value of the resistivity that can be lowered, and at present, it is desired to be about 22 μΩ · cm or less. Therefore, while maintaining such a resistivity value, oxidation resistance (oxidized weight increase, oxidized appearance)
Need to be improved.
【００１１】本発明で用いる酢酸鉛、ステアリン酸鉛及
びステアリン酸はそれぞれ単独で用いて銅粉の表面を処
理しても、耐酸化性と抵抗率の両方を満足し得る銅粉は
得られない。しかし、ステアリン酸鉛及びステアリン酸
の少なくとも一種１重量部と酢酸鉛２〜１０重量部とか
らなる処理剤で銅粉の表面を処理すると、電刷子の製造
に用いる銅粉に所望される程度の耐酸化性と抵抗率の両
方を満足し得る銅粉が得られる。酢酸鉛が上記の量比よ
りも多い場合（即ち、ステアリン酸鉛及び／又はステア
リン酸が上記の量比よりも少ない場合）には、耐酸化性
が不十分であり、一方、酢酸鉛が上記の量比よりも少な
い場合（即ち、ステアリン酸鉛及び／又はステアリン酸
が上記の量比よりも多い場合）には、抵抗率が高くな
る。ステアリン酸鉛及び／又はステアリン酸と酢酸鉛と
の好ましい混合比は被処理銅粉の粒度分布にも依存する
が、一般的にはステアリン酸鉛及びステアリン酸の少な
くとも一種１重量部に対して酢酸鉛３〜６重量部であ
る。Even if lead acetate, lead stearate, and stearic acid used in the present invention are used alone to treat the surface of copper powder, copper powder satisfying both oxidation resistance and resistivity cannot be obtained. .. However, when the surface of the copper powder is treated with a treating agent consisting of 1 part by weight of lead stearate and at least 1 part by weight of stearic acid and 2-10 parts by weight of lead acetate, the copper powder used in the production of the electrophotographic brush has a desired degree of treatment. A copper powder that satisfies both the oxidation resistance and the resistivity can be obtained. When the lead acetate content is higher than the above amount ratio (that is, the lead stearate and / or stearic acid content is less than the above amount ratio), the oxidation resistance is insufficient, while lead acetate When the amount ratio is less than the above amount ratio (that is, when the lead stearate and / or stearic acid is more than the above amount ratio), the resistivity becomes high. Although the preferable mixing ratio of lead stearate and / or stearic acid and lead acetate depends on the particle size distribution of the copper powder to be treated, generally, acetic acid is added to at least one part by weight of lead stearate and stearic acid. Lead is 3 to 6 parts by weight.
【００１２】本発明の表面処理剤で処理される銅粉は機
械的粉砕法、化学的還元法、電解法等の何れの方法で得
られたものでもよく、特に電解法で得られたもの、即ち
電解銅粉であることが好ましい。このような電解銅粉と
しては例えば下記の特性を有する樹枝状電解銅粉があ
る： 見掛密度 １．０５〜１．２５ｇ/cm3 粒度分布（メッシュ） ＋200 −200/＋250 −250/＋325 −325 （％） ＜5 5 〜 15 24 〜 32 50〜70The copper powder treated with the surface treating agent of the present invention may be obtained by any method such as mechanical pulverization method, chemical reduction method, electrolysis method, etc., especially electrolysis method, That is, it is preferably electrolytic copper powder. Examples of such electrolytic copper powder include dendritic electrolytic copper powder having the following characteristics: Apparent density 1.05 to 1.25 g / cm 3 Particle size distribution (mesh) +200 -200 / + 250 -250 / + 325- 325 (%) <5 5 to 15 24 to 32 32 50 to 70
【００１３】[0013]
実施例１〜６及び比較例１〜８ 銅粉として下記の特性を有する電刷子用樹枝状電解銅粉
（三井金属鉱業株式会社製、ＭＮ−２）を用いた： 見掛密度 １．２ｇ/cm3 粒度分布（メッシュ） ＋200 −200/＋250 −250/＋325 −325 （％） 3.0 10.1 26.6 60.3 表面処理剤として表１に記載のものを用いた。また、黒
鉛粉として鱗状黒鉛粉（日本黒鉛粉工業株式会社製、Ｃ
Ｂ−１５０）を用いた。Examples 1 to 6 and Comparative Examples 1 to 8 As the copper powder, a dendritic electrolytic copper powder for electric brushes (MN-2 manufactured by Mitsui Mining & Smelting Co., Ltd.) having the following characteristics was used: Apparent density 1.2 g / cm 3 Particle size distribution (mesh) +200 −200 / + 250 −250 / + 325 −325 (%) 3.0 10.1 26.6 60.3 The surface treatment agents shown in Table 1 were used. Further, as graphite powder, scaly graphite powder (manufactured by Nippon Graphite Powder Co., Ltd., C
B-150) was used.
【００１４】上記の銅粉を表１に記載の表面処理剤で処
理した。その処理した銅粉７０重量％と上記の黒鉛粉３
０重量％とからなる混合物を用いて、常温でプレス圧
２．５ｔ/cm2で加圧成形し、６００℃で焼結して電刷子
用成形体（厚さ約６mm、幅約１２mm、長さ約３０mmの直
方体）を得た。The above copper powder was treated with the surface treatment agent shown in Table 1. 70% by weight of the treated copper powder and the above graphite powder 3
0% by weight of the mixture, pressure molding at room temperature with a pressing pressure of 2.5 t / cm 2 , and sintering at 600 ° C. for electrobrush molding (thickness about 6 mm, width about 12 mm, length A rectangular parallelepiped having a size of about 30 mm) was obtained.
【００１５】上記の成形体を用い、通電量５Ａ／0.72〜
0.73cm2 、電圧端子間距離１cmで電圧降下法により抵抗
率（μΩ・ｃｍ）を測定した。一試料について４点測定
し、その平均値を求めた。また、上記の成形体を温度８
０℃、湿度９０％の促進条件下、２４０時間での重量増
加（％）を求め、また酸化に起因する外観の変化を観察
した（耐酸化性）。それらの結果を表１に示す。Using the above molded body, the energization amount is 5 A / 0.72
The resistivity (μΩ · cm) was measured by a voltage drop method at 0.73 cm 2 and a distance between voltage terminals of 1 cm. Four points were measured for one sample, and the average value was calculated. In addition, the above-mentioned molded body is heated to a temperature of
The weight increase (%) at 240 hours was determined under the accelerated condition of 0 ° C. and humidity of 90%, and the change in appearance due to oxidation was observed (oxidation resistance). The results are shown in Table 1.
【００１６】[0016]
【表１】 表１中、ＢＴＡはベンゾトリアゾールであり、ＬＡは酢
酸鉛であり、ＬＳはステアリン酸鉛であり、ＳＡはステ
アリン酸である。[Table 1] In Table 1, BTA is benzotriazole, LA is lead acetate, LS is lead stearate, and SA is stearic acid.
【００１７】[0017]
【発明の効果】本発明の銅粉用表面処理剤及び銅粉表面
の処理方法により、電刷子の製造に適した耐酸化性及び
抵抗率を有する銅粉を提供することができる。この銅粉
は従来実用されているＢＴＡで処理した銅粉よりも、抵
抗率が十分に低くなり且つ耐酸化性も十分に実用可能な
ものである。The surface treating agent for copper powder and the method for treating the surface of copper powder according to the present invention can provide a copper powder having oxidation resistance and resistivity suitable for producing an electric brush. This copper powder has a sufficiently lower resistivity and a sufficiently practical oxidation resistance than the copper powder treated with BTA which has been conventionally used.
Claims (3)
くとも一種１重量部と酢酸鉛２〜１０重量部とからなる
ことを特徴とする銅粉用表面処理剤。1. A surface treatment agent for copper powder, comprising 1 part by weight of at least one of lead stearate and stearic acid and 2 to 10 parts by weight of lead acetate.
処理することを特徴とする銅粉表面の処理方法。2. A method for treating a surface of copper powder, which comprises treating the surface of copper powder with the surface treatment agent according to claim 1.
請求項２記載の銅粉表面の処理方法。3. The method for treating the surface of copper powder according to claim 2, wherein the copper powder is electrolytic copper powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04018346A JP3128159B2 (en) | 1992-01-08 | 1992-01-08 | Copper powder surface treatment agent and copper powder surface treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04018346A JP3128159B2 (en) | 1992-01-08 | 1992-01-08 | Copper powder surface treatment agent and copper powder surface treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05179302A true JPH05179302A (en) | 1993-07-20 |
| JP3128159B2 JP3128159B2 (en) | 2001-01-29 |
Family
ID=11969107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04018346A Expired - Fee Related JP3128159B2 (en) | 1992-01-08 | 1992-01-08 | Copper powder surface treatment agent and copper powder surface treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3128159B2 (en) |
-
1992
- 1992-01-08 JP JP04018346A patent/JP3128159B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3128159B2 (en) | 2001-01-29 |
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