JPH0139462B2 - - Google Patents
Info
- Publication number
- JPH0139462B2 JPH0139462B2 JP56179484A JP17948481A JPH0139462B2 JP H0139462 B2 JPH0139462 B2 JP H0139462B2 JP 56179484 A JP56179484 A JP 56179484A JP 17948481 A JP17948481 A JP 17948481A JP H0139462 B2 JPH0139462 B2 JP H0139462B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- magnetic
- composition
- weight
- parts
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000000839 emulsion Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 11
- 239000004094 surface-active agent Substances 0.000 claims description 10
- 239000003973 paint Substances 0.000 claims description 9
- 239000000049 pigment Substances 0.000 claims description 9
- 239000002270 dispersing agent Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 150000003863 ammonium salts Chemical class 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 239000000080 wetting agent Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 description 17
- 239000011248 coating agent Substances 0.000 description 16
- 239000008199 coating composition Substances 0.000 description 8
- -1 polyethylene terephthalate Polymers 0.000 description 5
- 235000019441 ethanol Nutrition 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 150000001298 alcohols Chemical class 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Description
本発明は、磁性塗料組成物に関し、特に磁気カ
ード、磁気テープなどの磁気記録媒体を製造する
のに適した水性磁性塗料の製造方法に関する。
これまで磁気記録媒体は一般に有機溶剤に溶解
した合成樹脂の中に磁性顔料を分散したものをバ
ーコーター、リバースロールコーター、ノズルコ
ーターグラビアコーターなどを用いてポリエチレ
ンテレフタレートなどの基体に塗布して乾燥す
る。しかし、有機溶剤を用いる場合は人体に対す
る有害性および火災、爆発などの危険性を伴う。
そこでそれらの問題を解決するために水性エマル
シヨン塗料とすることが必要であるが、水系塗料
の場合磁性顔料の表面処理工程および分散工程に
おいて適切な分散剤の選定がなされなければ発泡
や凝集などの諸問題が生るばかりではなく、最終
塗膜の磁気特性、電磁変換特性はもちろんのこ
と、耐水性、塗膜強度などにも悪影響をおよぼ
す。ここでいう、耐水性への悪影響とは主に分散
剤の親水基が最終塗膜中に残留することから、最
終塗膜が親水性をもつことによる。従来の水性磁
性塗料組成物は、最終塗膜の磁気特性、電磁変換
特性、塗膜強度等に悪影響を与えない程度に十分
な分散を行なわせるために相当量の水溶性界面活
性剤を使用しているものであるので、最終塗膜中
における残留親水基の量も多くなり耐水性の点で
も問題のあるものであつた。
本発明の目的は、前述したような諸問題にかん
がみて、良好な磁気特性及び電磁変換特性を有
し、しかも耐水性及び塗膜強度のすぐれた最終塗
膜を与えうるような水性磁性塗料の製造方法を提
供することである。
本発明による水性磁性塗料の製造方法は、磁性
顔料と、湿潤剤および分散剤としてのアルコール
類またはセロソルブ類およびポリカルボン酸系界
面活性剤と、水とを含む組成にて磁性顔料の表面
処理を行い、該組成物に水をさらに加えて分散
し、該分散した組成物に水系エマルジヨンを加え
て塗料組成物とすることを特徴とする。
本発明によつて磁性顔料の湿潤剤及び分散剤と
してアルコールまたはセロソルブ類とポリカルボ
ン酸系界面活性剤とを併用することにより、水溶
性界面活性剤つまりポリカルボン酸系界面活性剤
の量を著しく減らすことができ、したがつて、最
終塗膜中における残留親水基の量も減少でき、耐
水性のすぐれた磁気塗膜を形成しうる水性磁性塗
料組成物とすることができる。
更に、本発明によつて、ポリカルボン酸系界面
活性剤としてポリカルボン酸アンモニウム塩を使
用すれば、塗布後の乾燥工程において加熱により
脱アンモニウム化が起り、最終塗膜における残留
親水基をなくすることができ、従つて、よりすぐ
れた耐水性を有する磁性塗膜を与えうるものとす
ることができる。
本発明で使用できるアルコールは、メチルアル
コール、エチルアルコール、イソプロピルアルコ
ール、ブチルアルコール等であり、セロソルブ類
としてはエチルセロソルブ（エチレングリコール
モノエチルエーテル）、ブチルセロソルブ（エチ
レングリコールモノブチルエーテル）などであ
る。またポリカルボン酸系界面活性剤は、ローム
アンドハース社のオロタン731SD、プライマル
850、オロタン901、オロタン960、サンノプコ社
ノプコザントＲ、ノプコザントRTF、花王石鹸
社のデモールEP、ポイズ520、ポイズ530、ポイ
ズ540などで重合度が10〜1000のものである。さ
らにポリカルボン酸アンモニウム塩としては、ロ
ームアンドハース社のオロタン165、サンノプコ
社のSNデイスパーザント5020などがある。水系
エマルシヨンは、例えば、ポリアクリル酸−メタ
クリル酸系エマルシヨン、酢酸ビニルエマルシヨ
ン、アクリル酸エステル・酢酸ビニル共重合体エ
マルシヨン、アクリル・スチレン共重合体エマル
シヨン、ウレタンエマルシヨン、エポキシエマル
シヨンなどがいずれも使用できる。
以下、本発明の具体的実施例について説明す
る。
実施例 １
次に示す組成で磁性顔料の表面処理を行なう。
ｒ−Fe2O3 50重量部
オロタン731SD（ロームアンドハース社）
４重量部
エチルセロソルブ 15重量部
水 20重量部
上に示した組成物に水20重量部を加えサンドグ
ラインドミルで分散する。次に分散した組成物に
水系エマルシヨンとしてアクリルエマルシヨンの
プライマルHA16（ロームアンドハース社）50重
量部を加え塗料組成物とする。この塗料をノズル
式コーテイング機でポリエチレンテレフタレート
基体に塗布し、80℃で２分間加熱して乾燥させ
る。
実施例 ２
ｒ−Fe2O3 50重量部
オロタン165（ロームアンドハース社） ４重量部
ブチルセロソルブ 15重量部
水 20重量部
消泡剤 １〜２重量部
上に示した組成で磁性顔料の表面処理を行ない
水39重量部を加えてボールミルで分散した後、ヨ
ドゾール2D131（カネボウ−NSC社）を50重量部
を加え塗料組成物とする。この塗料をノズル式コ
ーテイング機でポリエチレンテレフタレート基体
に塗布し、80℃で２分間加熱して乾燥させる。
実施例１、２より作製した磁気テープの浸水試
験結果を表１に示す。
The present invention relates to a magnetic coating composition, and particularly to a method for producing a water-based magnetic coating suitable for producing magnetic recording media such as magnetic cards and magnetic tapes. Until now, magnetic recording media have generally been produced by dispersing magnetic pigments in synthetic resin dissolved in an organic solvent, which is coated onto a substrate such as polyethylene terephthalate using a bar coater, reverse roll coater, nozzle coater, gravure coater, etc., and then dried. . However, when organic solvents are used, they are harmful to the human body and involve risks such as fire and explosion.
Therefore, in order to solve these problems, it is necessary to use water-based emulsion paints, but in the case of water-based paints, if an appropriate dispersant is not selected in the surface treatment process and dispersion process of magnetic pigments, problems such as foaming and agglomeration may occur. This not only causes various problems, but also adversely affects not only the magnetic properties and electromagnetic conversion properties of the final coating film, but also the water resistance, coating strength, etc. The adverse effect on water resistance here is mainly due to the fact that the hydrophilic groups of the dispersant remain in the final coating film, making the final coating film hydrophilic. Conventional water-based magnetic coating compositions use a considerable amount of water-soluble surfactant to achieve sufficient dispersion without adversely affecting the magnetic properties, electromagnetic conversion properties, coating strength, etc. of the final coating film. Therefore, the amount of residual hydrophilic groups in the final coating film was also large, which caused problems in terms of water resistance. In view of the above-mentioned problems, the object of the present invention is to develop a water-based magnetic paint that has good magnetic properties and electromagnetic conversion properties, and can provide a final coating film with excellent water resistance and film strength. An object of the present invention is to provide a manufacturing method. The method for producing a water-based magnetic paint according to the present invention involves surface-treating a magnetic pigment with a composition containing a magnetic pigment, alcohols or cellosolves as a wetting agent and dispersant, and a polycarboxylic acid surfactant, and water. The composition is characterized in that it is further dispersed by adding water to the composition, and a water-based emulsion is added to the dispersed composition to obtain a coating composition. According to the present invention, by using alcohol or cellosolves together with a polycarboxylic acid surfactant as a wetting agent and dispersant for magnetic pigments, the amount of the water-soluble surfactant, that is, the polycarboxylic acid surfactant, can be significantly reduced. Therefore, the amount of residual hydrophilic groups in the final coating film can be reduced, and an aqueous magnetic coating composition capable of forming a magnetic coating film with excellent water resistance can be obtained. Furthermore, according to the present invention, if a polycarboxylic acid ammonium salt is used as a polycarboxylic acid surfactant, deammoniumization occurs by heating in the drying process after application, eliminating residual hydrophilic groups in the final coating film. Therefore, it is possible to provide a magnetic coating film having better water resistance. Alcohols that can be used in the present invention include methyl alcohol, ethyl alcohol, isopropyl alcohol, butyl alcohol, and cellosolves include ethyl cellosolve (ethylene glycol monoethyl ether) and butyl cellosolve (ethylene glycol monobutyl ether). Polycarboxylic acid surfactants include Rohm and Haas' Orotane 731SD and Primal
850, Orotane 901, Orotane 960, San Nopco's Nopcosant R, Nopcosant RTF, Kao Soap Co.'s Demol EP, Poise 520, Poise 530, Poise 540, etc., with a degree of polymerization of 10 to 1000. Furthermore, examples of polycarboxylic acid ammonium salts include Orotane 165 from Rohm and Haas and SN Dispersant 5020 from Sannopco. Examples of water-based emulsions include polyacrylic acid-methacrylic acid emulsions, vinyl acetate emulsions, acrylic ester/vinyl acetate copolymer emulsions, acrylic/styrene copolymer emulsions, urethane emulsions, and epoxy emulsions. Can be used. Hereinafter, specific examples of the present invention will be described. Example 1 A magnetic pigment was surface-treated with the following composition. r-Fe 2 O 3 50 parts by weight Orotane 731SD (Rohm and Haas)
4 parts by weight Ethyl cellosolve 15 parts by weight Water 20 parts by weight Add 20 parts by weight of water to the above composition and disperse with a sand grind mill. Next, 50 parts by weight of acrylic emulsion Primal HA16 (Rohm and Haas) is added to the dispersed composition as an aqueous emulsion to prepare a coating composition. This paint is applied to a polyethylene terephthalate substrate using a nozzle coating machine, and dried by heating at 80°C for 2 minutes. Example 2 r-Fe 2 O 3 50 parts by weight Orotane 165 (Rohm and Haas) 4 parts by weight Butyl cellosolve 15 parts by weight Water 20 parts by weight Antifoaming agent 1 to 2 parts by weight Surface treatment of magnetic pigment with the composition shown above After adding 39 parts by weight of water and dispersing in a ball mill, 50 parts by weight of Yodozol 2D131 (Kanebo-NSC) was added to prepare a coating composition. This paint is applied to a polyethylene terephthalate substrate using a nozzle coating machine, and dried by heating at 80°C for 2 minutes. Table 1 shows the water immersion test results for the magnetic tapes prepared in Examples 1 and 2.
【表】
また、実施例１、２より作製した磁気テープの
磁気特性を表２に示す。Table 2 also shows the magnetic properties of the magnetic tapes produced in Examples 1 and 2.
【表】
これらと比較するためにｒ−Fe2O350重量部に
対して良好に分散できるポリカルボン酸系界面活
性剤の量を実験で確めたところ25％水溶液として
15〜20重量部必要であつた。このように分散した
組成物にアクリルエマルシヨンを50重量部加えて
磁性塗料組成物とする。この組成物をポリエチレ
ンテレフタレート基体に塗布し100℃で加熱乾燥
して磁気テープを作製した。この磁気テープを浸
水試験した結果、浸水後６時間で吸水・膨潤し
た。
これらの結果は、本発明による塗料組成物によ
る塗膜は従来の水系エマルシヨン塗料よりもきわ
めて優れた耐水性を示し、分散性も優れているこ
とを示す。[Table] In order to compare with these, the amount of polycarboxylic acid surfactant that can be well dispersed in 50 parts by weight of r-Fe 2 O 3 was determined through experiments, and the amount was determined as a 25% aqueous solution.
15 to 20 parts by weight were required. A magnetic coating composition is prepared by adding 50 parts by weight of acrylic emulsion to the thus dispersed composition. This composition was applied to a polyethylene terephthalate substrate and dried by heating at 100°C to produce a magnetic tape. As a result of a water immersion test, this magnetic tape absorbed water and swelled 6 hours after being immersed in water. These results show that the coating film made from the coating composition according to the present invention exhibits extremely superior water resistance and dispersibility compared to conventional water-based emulsion coatings.
Claims (1)
ルコール類またはセロソルブ類およびポリカルボ
ン酸系界面活性剤と、水とを含む組成にて磁性顔
料の表面処理を行い、該組成物に水をさらに加え
て分散し、該分散した組成物に水系エマルジヨン
を加えて塗料組成物とすることを特徴とする水性
磁性塗料の製造方法。 ２ 前記ポリカルボン酸系界面活性剤は、ポリカ
ルボン酸アンモニウム塩である特許請求の範囲第
１項記載の水性磁性塗料の製造方法。[Claims] 1. A magnetic pigment is surface-treated with a composition containing a magnetic pigment, an alcohol or cellosolve as a wetting agent and a dispersant, and a polycarboxylic acid surfactant, and water. 1. A method for producing a water-based magnetic paint, which comprises further adding water to the material for dispersion, and adding a water-based emulsion to the dispersed composition to obtain a paint composition. 2. The method for producing an aqueous magnetic paint according to claim 1, wherein the polycarboxylic acid surfactant is a polycarboxylic acid ammonium salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17948481A JPS5880365A (en) | 1981-11-09 | 1981-11-09 | Aqueous magnetic paint composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17948481A JPS5880365A (en) | 1981-11-09 | 1981-11-09 | Aqueous magnetic paint composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5880365A JPS5880365A (en) | 1983-05-14 |
| JPH0139462B2 true JPH0139462B2 (en) | 1989-08-21 |
Family
ID=16066635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17948481A Granted JPS5880365A (en) | 1981-11-09 | 1981-11-09 | Aqueous magnetic paint composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5880365A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AUPM981994A0 (en) * | 1994-12-02 | 1995-01-05 | Vanadale Pty Limited | Magnetic coating composition |
| TR201708065T4 (en) * | 2013-01-14 | 2019-02-21 | Actega Terra Gmbh | Micro structured paint. |
| CN104017503B (en) * | 2014-06-25 | 2016-05-18 | 中国人民解放军国防科学技术大学 | Non-water-base magnetic rheology polishing liquid and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4946922A (en) * | 1972-08-25 | 1974-05-07 | ||
| JPS521633A (en) * | 1975-06-24 | 1977-01-07 | Babcock Hitachi Kk | Combution gas deflection prevention device |
| JPS551633A (en) * | 1978-06-20 | 1980-01-08 | Hitachi Maxell Ltd | Production of magnetic recording medium |
| JPS5835727A (en) * | 1981-08-24 | 1983-03-02 | Dai Showa Seishi Kk | Composition of aqueous magnetic painting agent |
-
1981
- 1981-11-09 JP JP17948481A patent/JPS5880365A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4946922A (en) * | 1972-08-25 | 1974-05-07 | ||
| JPS521633A (en) * | 1975-06-24 | 1977-01-07 | Babcock Hitachi Kk | Combution gas deflection prevention device |
| JPS551633A (en) * | 1978-06-20 | 1980-01-08 | Hitachi Maxell Ltd | Production of magnetic recording medium |
| JPS5835727A (en) * | 1981-08-24 | 1983-03-02 | Dai Showa Seishi Kk | Composition of aqueous magnetic painting agent |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5880365A (en) | 1983-05-14 |
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