JPH0735505B2 - Abrasive paint - Google Patents
Abrasive paintInfo
- Publication number
- JPH0735505B2 JPH0735505B2 JP62245111A JP24511187A JPH0735505B2 JP H0735505 B2 JPH0735505 B2 JP H0735505B2 JP 62245111 A JP62245111 A JP 62245111A JP 24511187 A JP24511187 A JP 24511187A JP H0735505 B2 JPH0735505 B2 JP H0735505B2
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- slurry
- abrasive
- dispersion
- solvent
- 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.)
- Expired - Fee Related
Links
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は磁気記録媒体に関し、特に磁気記媒体に用いる
研磨剤塗料に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium, and more particularly to an abrasive coating material used for the magnetic recording medium.
従来の技術 磁気記録媒体には研磨剤が不可欠の材料であり、その研
磨剤（例えば、α−Al2O3,Cr2O3,α−Fe2O3）の分散の
良否は、媒体の品質を大きく左右する。即ち、研磨剤の
分散が悪く凝集塊のまま磁性塗料中に存在し塗布される
と、磁性塗膜に凝集塊のまま残ることになり、ヘッド磨
耗を異常に大きくするなどの問題点があった。その解決
の為には、種々の方法により、研磨剤を磁性塗料とは別
の工程で塗料化するなどの手法がとられていた。塗料化
には、従来より、研磨剤を充分な樹脂で吸着・被服させ
るペーストと、樹脂を用いず溶剤と分散剤だけで塗料化
するスラリーとがある。2. Description of the Related Art Abrasives are essential materials for magnetic recording media, and the quality of dispersion of the abrasives (eg, α-Al 2 O 3 , Cr 2 O 3 , α-Fe 2 O 3 ) depends on the medium. It greatly affects the quality. That is, when the abrasive is not well dispersed and remains in the magnetic paint as agglomerates and is applied, they remain as agglomerates in the magnetic coating film, causing a problem of abnormally increasing head wear. . In order to solve the problem, various methods have been used, such as converting the abrasive into a paint in a step different from the magnetic paint. Conventionally, there are a paste for adsorbing and coating an abrasive with a sufficient resin, and a slurry for making a paint only with a solvent and a dispersant without using a resin.
発明が解決しようとする問題点 前者のペースト化は分散の為には有効な方法であり、研
磨剤の分散は充分になされるものであるが、別工程であ
り、研磨剤自身が研磨性が大きいため分散装置の損耗も
大きくなり、製造コストが高くなるという問題があっ
た。また、スラリー化工法は製造コストはより安価では
あるが分散性が劣るという問題があった。Problems to be Solved by the Invention The former method of forming a paste is an effective method for dispersion, and the dispersion of the polishing agent is sufficiently performed, but it is a separate step and the polishing agent itself has a polishing property. Since it is large, there is a problem that the wear of the dispersion device is also large and the manufacturing cost is high. Further, the slurry method has a problem that the dispersibility is poor although the manufacturing cost is lower.
問題点を解決するための手段 この問題点を解決するために、本発明の研磨剤塗料は、
研磨剤アルミナ，分散剤リン酸エステルおよび溶剤シク
ロヘキサノンからなることを特徴とするものである。Means for Solving the Problems In order to solve this problem, the abrasive coating material of the present invention is
It is characterized by comprising an abrasive alumina, a dispersant phosphoric acid ester and a solvent cyclohexanone.
作用 本発明者はスラリー化工法の改善のために、研磨剤とし
てアルミナを用い、分散剤と溶剤の有効な組み合せにつ
いて検討した。磁性塗料の調製に用いられる代表的な有
機溶剤として、メチルエチルケトン（以下MEKと略
記），トルエン，シクロヘキサノン，メタノールを用
い、同じく代表的な分散剤を用い、これらとアルミナの
３者の組み合せを考え、アルミナポットミル（ビーズは
アルミナ）でスラリー化調製を行い、アルミナの粒子の
平均粒径の測定と、沈降試験による分散安定性の評価を
行った。その結果、最も良いスラリー分散系の組み合せ
の１つとしては、アルミナ／リン酸エステル／シクロヘ
キサノンであることを見い出した。リン酸エステルとし
て秀れているものは、たとえば（株）東邦化学のGAFAC
のRE610であり、これと同等品の（株）第一工業製薬の
プライサーフA21ZEであることが判明した。このプライ
サーフのリン酸基はアルミナの表面によく吸着し、溶剤
がシクロヘキサノンで親水性溶剤で親水性アルミナにな
じみが良いことから、このアルミナ／プライサーフAZ1Z
E/シクロヘキサノンの組み合せが、アルミナのスラリー
分散系としては最も良いものの１つであることが首肯で
きる。（株）第一工業製薬のプライサーフA212Eの諸元
は以下のとうりである。Effect The present inventor used alumina as an abrasive and studied an effective combination of a dispersant and a solvent in order to improve the slurry forming method. Methyl ethyl ketone (hereinafter abbreviated as MEK), toluene, cyclohexanone, and methanol were used as typical organic solvents used in the preparation of magnetic paint, and a typical dispersant was also used. Considering the combination of these and alumina, A slurry was prepared with an alumina pot mill (beads were alumina), and the average particle size of alumina particles was measured and the dispersion stability was evaluated by a sedimentation test. As a result, they have found that one of the best slurry dispersion combinations is alumina / phosphate / cyclohexanone. What is excellent as a phosphoric acid ester is, for example, GAFAC of Toho Chemical Co., Ltd.
It was found to be RE610, which is the equivalent of this product, and Prisurf Surf A21ZE manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd. The phosphate group of this plysurf is well adsorbed on the surface of alumina, and the solvent is cyclohexanone, and the hydrophilic solvent is well compatible with hydrophilic alumina. Therefore, this alumina / plysurf AZ1Z
It can be confirmed that the combination of E / cyclohexanone is one of the best slurry dispersion systems for alumina. The specifications of Dai-ichi Kogyo Seiyaku Co., Ltd.'s Prisurf A212E are as follows.
以下、実施例を挙げて詳しく説明する。 Hereinafter, a detailed description will be given with reference to examples.
実 施 例 実施例１ 予備実験として沈降試験を行った。試験管（内径16mm,
高さ147mm）の半分まで各溶剤を注ぎ、研磨剤アルミナ
（住友化学:AKP−50）を0.1gと各分散剤（アルミナに対
し２重量部）を添加し、超音波分散を10分間行い、静置
して、最長42.7時間までの分散安定性を相対評価した。
第１表にその結果を示す。目視判定により、◎は極めて
良好，○は良好，△は中間，×は分散安定性悪い，と判
定した。Examples Example 1 A sedimentation test was conducted as a preliminary experiment. Test tube (inner diameter 16 mm,
Pour each solvent to half the height (147 mm), add 0.1 g of abrasive alumina (Sumitomo Chemical: AKP-50) and each dispersant (2 parts by weight to alumina), and perform ultrasonic dispersion for 10 minutes. The sample was left to stand still, and the dispersion stability up to 42.7 hours was relatively evaluated.
The results are shown in Table 1. By visual judgment, ⊚ was extremely good, ○ was good, Δ was intermediate, and x was poor dispersion stability.
以上の結果から、アルミナ/P−A212E/シクロヘキサノン
のスラリー系が最も良いことが判る。溶剤がメタノール
の系でも良いが、沸点が低く有毒であるので現実には使
えない。 From the above results, it is understood that the slurry system of alumina / P-A212E / cyclohexanone is the best. The solvent may be methanol, but it cannot be used in practice because it has a low boiling point and is toxic.
実施例２ 1.6のアルミナポット（ビーズはアルミナ）を用いて
アルミナスラリーを調製した。組成は第２表に示すもの
であり、分散は10時間行った。尚、アルミナスラリー中
のアルミナ粒子の平均粒径（Median値）の測定は、
（株）堀場製作所の沈降式自動粒度分布測定装置（CAPA
−300）を用いて、下記条件で測定した。Example 2 An alumina slurry was prepared using the 1.6 alumina pot (beads were alumina). The composition is shown in Table 2, and the dispersion was performed for 10 hours. The average particle size (Median value) of the alumina particles in the alumina slurry is
HORIBA, Ltd. automatic sedimentation particle size analyzer (CAPA
-300) was used and measured under the following conditions.
アルミナの密度 3.99g/cm3 溶剤MEKの密度 0.81g/c.c.,粘度0.44cps 最大・最小径 2.0〜0.1μｍ（0.1μｍ間隔） 回転数 1500rpm 又、実施例１と同様の沈降試験も行った。結果を第２表
に示す。Density of alumina 3.99 g / cm 3 Density of solvent MEK 0.81 g / cc, viscosity 0.44 cps Maximum / minimum diameter 2.0 to 0.1 μm (interval of 0.1 μm) Rotation speed 1500 rpm Also, the same sedimentation test as in Example 1 was conducted. The results are shown in Table 2.
以上の結果からも、アルミナ/P−A212E/シクロヘキサノ
ンのスラリーは良く分散され、分散安定性も良いスラリ
ーであることが判る。 From the above results, it is understood that the slurry of alumina / P-A212E / cyclohexanone is well dispersed and has good dispersion stability.
発明の効果 以上述べたように、アルミナのスラリー化工法はペース
ト工法と比べ分散性はやや劣るものの、より低コスト
で、短時間でスラリーを調製することができる。ちなみ
に、AKP−50をペースト化工法で調製した場合、Median
値は0.25μｍとなりスラリー工法より秀れることは言う
までもない。EFFECTS OF THE INVENTION As described above, the alumina slurry forming method is slightly inferior to the paste forming method in dispersibility, but the slurry can be prepared at a lower cost and in a shorter time. By the way, when AKP-50 was prepared by the paste method, Median
Needless to say, the value is 0.25 μm, which is superior to the slurry method.
従って、アルミナの分散が厳しく要求されない品質のビ
デオテープの作製には、このスラリー工法で調製したア
ルミナスラリーは適用できる。なぜなら、Median値が0.
27μｍとかなり分散されている状態であり、この程度の
分散でもヘッド磨耗、その他の耐久試験の結果からは今
までの多くのデーターからみて、アルミナの分散性は不
充分とは言えないからである。Therefore, the alumina slurry prepared by this slurry method can be applied to the production of a video tape of a quality in which the dispersion of alumina is not strictly required. Because the Median value is 0.
This is because it is a very dispersed state of 27 μm, and even with this level of dispersion, it can be said that the dispersibility of alumina cannot be said to be insufficient from the results of head wear and other endurance tests, in view of many data up to now. .
本スラリー工法は、アルミナに対しシクロヘキサノン溶
剤と、両者に最もふさわしい分散剤としてリン酸エステ
ルを用い、簡便にして低コストで実用的に問題の無い程
度に分散されたアルミナスラリーを提供するものであ
る。This slurry construction method uses a cyclohexanone solvent for alumina and a phosphoric acid ester as the most suitable dispersant for both, and provides an alumina slurry that is simple, low-cost and practically problem-free. .
なお、溶剤は必ずしもシクロヘキサノンだけである必要
はなく、他の溶剤（例えば、MEK,トルエン）などが、幾
分混っても実用上は余り変らないことは既に確認済であ
る。It should be noted that the solvent does not necessarily have to be cyclohexanone, and it has already been confirmed that practically it does not change much even if some other solvent (for example, MEK, toluene) is mixed.
Claims (1)
よび溶剤シクロヘキサノンからなることを特徴とする研
磨剤塗料。1. An abrasive coating material comprising an abrasive alumina, a dispersant phosphoric acid ester and a solvent cyclohexanone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62245111A JPH0735505B2 (en) | 1987-09-29 | 1987-09-29 | Abrasive paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62245111A JPH0735505B2 (en) | 1987-09-29 | 1987-09-29 | Abrasive paint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6487672A JPS6487672A (en) | 1989-03-31 |
| JPH0735505B2 true JPH0735505B2 (en) | 1995-04-19 |
Family
ID=17128784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62245111A Expired - Fee Related JPH0735505B2 (en) | 1987-09-29 | 1987-09-29 | Abrasive paint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0735505B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5623576B2 (en) | 2012-03-30 | 2014-11-12 | 富士フイルム株式会社 | Magnetic recording medium and method for manufacturing the same |
-
1987
- 1987-09-29 JP JP62245111A patent/JPH0735505B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6487672A (en) | 1989-03-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |