JPS61246262A - Production of copolymerizable magnetic fluid - Google Patents
Production of copolymerizable magnetic fluidInfo
- Publication number
- JPS61246262A JPS61246262A JP8827185A JP8827185A JPS61246262A JP S61246262 A JPS61246262 A JP S61246262A JP 8827185 A JP8827185 A JP 8827185A JP 8827185 A JP8827185 A JP 8827185A JP S61246262 A JPS61246262 A JP S61246262A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- copolymerizable
- magnetic fluid
- polybutadiene
- suspension
- 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.)
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- Compositions Of Macromolecular Compounds (AREA)
- Polymerisation Methods In General (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、共重合性を有する磁性流体の製造方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a copolymerizable magnetic fluid.
〔産業上の利用分野〕〔従来の技術〕
マグネタイト、Mn−Znフェライトなどの強磁性微粒
子にオレイン酸、リノール酸、リルイン酸などの長鎖不
飽和詣肪酸イオンを吸着させ、そのまま又は各種界面活
性剤を追加して、水、ケロシン、エステル溶剤などに安
定分散させた磁性流体が開発され、その用途面での検討
も広範囲に及んでいる。その用途開発の代表的なものと
しては次のものがある。[Industrial field of application] [Prior art] Long-chain unsaturated fatty acid ions such as oleic acid, linoleic acid, and lyluic acid are adsorbed onto ferromagnetic fine particles such as magnetite and Mn-Zn ferrite, and then either as they are or attached to various interfaces. Magnetic fluids with added activators and stably dispersed in water, kerosene, ester solvents, etc. have been developed, and their applications are being extensively studied. Typical examples of its application development include the following.
0 磁束の集中部分に磁性流体をおくことによって得ら
れるシーリング作用。0 Sealing effect obtained by placing magnetic fluid in areas where magnetic flux is concentrated.
・ 磁場勾配下におかれた磁性流体中の非磁性物質に働
く、磁気的浮力を利用した比重選別・ 磁性を利用した
記録材料
・ 廃油処理
0 種々のデバイス
上に述べた用途面での検討の内、実用化されているもの
も多いが、その用途は液状で磁性を生かしたものに限定
されていた。・Gravity sorting using magnetic buoyancy that acts on non-magnetic substances in magnetic fluid placed under a magnetic field gradient ・Recording materials using magnetism ・Waste oil treatment Many of these have been put into practical use, but their use was limited to those that are liquid and make use of magnetism.
本発明は、従来の磁性流体の特性を維持し、かつ従来の
磁性流体にはなかった共重合性を付与したものであり、
本発明の磁性流体を使用すると、コアとして磁性体微粒
子を含有するエマルジョン又は末端に磁性体微粒子を含
有する水溶性重合体の製造が可能となる。The present invention maintains the characteristics of conventional magnetic fluids and provides copolymerizability, which conventional magnetic fluids do not have.
When the magnetic fluid of the present invention is used, it is possible to produce an emulsion containing magnetic fine particles as a core or a water-soluble polymer containing magnetic fine particles at the end.
このような共重合性を有する磁性流体と他の重合性ビニ
ル単量体を重合させることで、磁性体微粒子を含有する
膜の形成、他の材料に混入する磁性体微粒子材料の入手
などが可能となる。又、水溶性重合体の末端に磁性体微
粒子を含有させると、磁界による移動が可能となり、水
溶性重合体を用いた分離、濃縮作用が磁力で促進される
。By polymerizing such copolymerizable magnetic fluids with other polymerizable vinyl monomers, it is possible to form films containing magnetic fine particles and obtain magnetic fine particle materials that can be mixed into other materials. becomes. Furthermore, when magnetic fine particles are contained at the end of the water-soluble polymer, movement by a magnetic field becomes possible, and separation and concentration effects using the water-soluble polymer are promoted by magnetic force.
〔問題点を解決するための手段〕〔作用〕本発明は、上
記の点に鑑み、湿式法による強磁性酸化物微粉末の水懸
濁液にマレイン化ポリブタジェンあるいはその塩を主成
分とする高分子界面活性剤を添加して、該界面活性剤を
上記懸濁液中の微粉末表面の単分子層以上、吸着せしめ
ることを特徴とする。共重合性を有する磁性流体の製造
方法を骨子とするものである。[Means for Solving the Problems] [Operation] In view of the above points, the present invention provides a method for adding a high-density polymer containing maleated polybutadiene or a salt thereof to an aqueous suspension of fine ferromagnetic oxide powder by a wet method. It is characterized in that a molecular surfactant is added and the surfactant is adsorbed to a monomolecular layer or more on the surface of the fine powder in the suspension. The main idea is a method for producing a copolymerizable magnetic fluid.
以下詳細について説明する。Details will be explained below.
本発明における磁性流体の製造方法では、湿式法で得た
マグネタイト、Mn−Znフェライトなどの強磁性微粒
子の水懸濁液にマレイン化ポリブタジェンのアンモニア
;アミン;ナルカリ金属の水酸化物などによる中和物を
添加して、該、強磁性微粒子の表面に単分子層以上吸着
せしめる。しかる後に、マレイン化ポリブタジェンの共
重合性二重結合を利用し、重合性ビニル単量体と共重合
させることで、コアに磁性体微粒子を含有するエマルジ
・ン又は、末端に磁性体微粒子を含有する水溶性重合体
が得られる。In the method for producing a magnetic fluid according to the present invention, an aqueous suspension of ferromagnetic fine particles such as magnetite or Mn-Zn ferrite obtained by a wet method is neutralized with ammonia of maleated polybutadiene, an amine, a hydroxide of Narkali metal, etc. A monomolecular layer or more is adsorbed onto the surface of the ferromagnetic fine particles. Thereafter, by utilizing the copolymerizable double bonds of the maleated polybutadiene and copolymerizing it with a polymerizable vinyl monomer, an emulsion containing magnetic fine particles in the core or containing magnetic fine particles at the ends is created. A water-soluble polymer is obtained.
本発明の基本となるマレイン化ポリブタジェンとしては
次のものが用いられる。The following maleated polybutadienes are used as the basis of the present invention.
まず、マレイン化ポリブタジェンの原料となるポリブタ
ジェンとしては、数平均分子量が500乃至s、ooo
望ましくはL 000乃至3.000であるポリブタジ
ェンまたはブタジェン単位として10重量%以上好まし
くは40重量%以と含有する上記の数平均分子量を有す
るブタジェン共重合体或はこれらの重合体の変性物など
が好ましい。尚、上記ポリブタジェンは1.2−ビニル
型、l、4−トランス型、又1,4−シス型のいずれの
構造を有するものであってもよく、勿論これらの構造の
部分混合物であってもさしつかえない。First, polybutadiene, which is a raw material for maleated polybutadiene, has a number average molecular weight of 500 to s, ooo
A polybutadiene preferably having L 000 to 3,000, a butadiene copolymer having the above-mentioned number average molecular weight containing 10% by weight or more, preferably 40% by weight or less as butadiene units, or a modified product of these polymers. preferable. The above polybutadiene may have any structure of 1,2-vinyl type, 1,4-trans type, or 1,4-cis type, and of course may be a partial mixture of these structures. I can't help it.
使用するポリブタジェンは、分子量がこの範囲にあると
きはマレイン化反応時の粘度が適当なこと及びマレイン
化反応後中和して高分子乳化剤として使用する場合の分
散性に優れるので好ましい。When the molecular weight of the polybutadiene used is within this range, it is preferable because the viscosity during the maleation reaction is appropriate and the polybutadiene has excellent dispersibility when neutralized after the maleation reaction and used as a polymer emulsifier.
この分子量より大きな場合、マレイン化反応時に高粘度
となり取扱いが困難となる。又、小さな場合粘度は取扱
い上問題とならないが、マレイン化反応後中和して高分
子乳化剤として使用する場合の分散性が劣り、高分子乳
化剤として使用出来ない。If the molecular weight is larger than this, the viscosity becomes high during the maleation reaction, making handling difficult. In addition, if the viscosity is small, there is no problem in handling, but when the viscosity is neutralized after the maleation reaction and used as a polymer emulsifier, the dispersibility is poor and it cannot be used as a polymer emulsifier.
これらのポリブタジェンをマレイン化するには、ポリブ
タジェンにマレイン酸、又は無水マレイン酸を反応させ
る。この反応はポリブタジェンをマレイン酸又は無水マ
レイン酸更に必要に応じて溶剤と共に反応容器に入れて
、充分に窒素置換し、高速攪拌しながら通常約150℃
乃至250℃に加熱して行なう。To maleate these polybutadienes, maleic acid or maleic anhydride is reacted with the polybutadienes. This reaction is carried out by placing polybutadiene in a reaction vessel together with maleic acid or maleic anhydride and, if necessary, a solvent.
This is done by heating to 250°C.
かくして得られたマレイン化ポリブタジェンはマレイン
化反応において、マレイン酸を用いた場合はマレイン化
反応後、カルボン酸基を中和する。The maleated polybutadiene thus obtained neutralizes the carboxylic acid groups after the maleation reaction when maleic acid is used in the maleation reaction.
一方無水マレイン酸を用いた場合には水、アルコール、
アミンなどで開環して、ジカルボン酸半エステル化物、
半アシド化物として、更にカルボン酸基を中和する。On the other hand, when maleic anhydride is used, water, alcohol,
Ring-opened with amine etc. to form dicarboxylic acid half ester,
As a semi-acid compound, the carboxylic acid group is further neutralized.
上記のマレイン化ポリブタジェンの酸価は60乃至30
0の範囲が望ましく、この範囲にあるときは、中和後の
水溶化能が充分である。The acid value of the above maleated polybutadiene is 60 to 30.
A range of 0 is desirable, and when it is within this range, the water solubilizing ability after neutralization is sufficient.
カルボン酸基の中和用に使用される中和剤としては、ア
ンモニア、アミン類、或いはアルカリ金属の水酸化物な
どがあげられる。アミンとしては1級、2級又は3級の
アミン類、更にジアミン。Examples of the neutralizing agent used for neutralizing the carboxylic acid group include ammonia, amines, and alkali metal hydroxides. The amines include primary, secondary or tertiary amines, and diamines.
トリアミンなどの多価アミンが使用できる。Polyvalent amines such as triamines can be used.
この場合の中和剤の使用量は、マレイン化ポリブタジェ
ンのカルボキシル基1当量に対して通常0.2〜00g
当量、好ましくは0.3〜0.7当量とするのが磁性体
微粒子への吸着、及び吸着後の分散性より望ましい。In this case, the amount of neutralizing agent used is usually 0.2 to 00 g per equivalent of carboxyl group of maleated polybutadiene.
An equivalent amount, preferably 0.3 to 0.7 equivalents, is desirable from the viewpoint of adsorption to magnetic fine particles and dispersibility after adsorption.
以と述べたように、特定のマレイン化ポリブタジェンの
中和物を用い湿式法で得られるマグネタイト、Mn−Z
n、フェライトなどの磁性体微粒子に吸着させ分散させ
ることで、従来、長鎖不飽和脂肪酸イオンを分散剤とし
たと同様の磁性流体が得られるばかりでなく、残存する
マレイン化ポリブタジェン中の二重結合を利用し、重合
性ビニル単量体と共重合させることで、コアに磁性体微
粒子を含有するエマルジ・ン又は末端に磁性体微粒子を
含有する水溶性重合体などの製造が可能となる。As mentioned above, magnetite, Mn-Z, obtained by a wet method using a specific neutralized product of maleated polybutadiene
By adsorbing and dispersing n, magnetic particles such as ferrite, it is possible not only to obtain a magnetic fluid similar to that obtained by using conventional long-chain unsaturated fatty acid ions as a dispersant, but also to obtain By utilizing the bond and copolymerizing with a polymerizable vinyl monomer, it is possible to produce emulsions containing magnetic fine particles in the core or water-soluble polymers containing magnetic fine particles at the ends.
この結果、重合体の一部に磁性体微粒子を含有させるこ
とが出来、従来、磁性体微粒子の製造、及びバインダー
材料への混合分散に大変困難を伴っていた磁性塗料や複
写機用の磁性トナーなどの製造が容易となる。As a result, it is possible to incorporate magnetic fine particles into a part of the polymer, and it is now possible to create magnetic paints and magnetic toners for copying machines, which previously had great difficulty in manufacturing magnetic fine particles and mixing and dispersing them into binder materials. It becomes easy to manufacture such as.
又、水溶性重合体の場合、懸濁物の沈降分離作用におい
て外部磁力による沈降速度、脱水速度の促進ならびに含
水率の低減が可能となり、水溶性重合体の使用における
懸案事項が解決される。In addition, in the case of water-soluble polymers, it is possible to accelerate the sedimentation rate and dehydration rate and reduce the water content by external magnetic force in the sedimentation and separation action of suspended matter, thus solving the problems associated with the use of water-soluble polymers.
以下製造例、実施例、比較例に基づいて本発明を説明す
る。なお、各側における部9%は重量部。The present invention will be described below based on production examples, examples, and comparative examples. Note that the parts 9% on each side are parts by weight.
重量%をさす。Refers to weight%.
〔製造例1’ ]
ポリブタジェンA(数平均分子量1.000 : 1.
2−ビニル型91%、1,4−トランス型9%)170
2、無水マレイン酸30?及びキシレンloomjをオ
ートクレーブに封入し窒素ガスで充分置換した後90回
転/分の速度で攪拌しながら170〜190℃で5時間
加熱してマレイン反応を行なう。[Production Example 1'] Polybutadiene A (number average molecular weight 1.000: 1.
2-vinyl type 91%, 1,4-trans type 9%) 170
2. Maleic anhydride 30? and xylene loomj are sealed in an autoclave, the autoclave is sufficiently purged with nitrogen gas, and the mixture is heated at 170 to 190° C. for 5 hours with stirring at a speed of 90 revolutions/minute to carry out a maleic reaction.
反応後、水で洗浄しキシレン及び未反応の無水マレイン
酸を除去する。得られたマレイン化ポリブタジエ5−価
は122で脱水後の粘度は約30万cps 730℃で
ありた。次に脱水したマレイン化ポリブタジェン100
9を取り、28%アンモニア水9.29(中和当量0.
7)を加え、攪拌しながら中和し、更に水を加えて不揮
発分を30%に調整する。After the reaction, xylene and unreacted maleic anhydride are removed by washing with water. The maleated polybutadiene obtained had a pentavalent value of 122 and a viscosity after dehydration of about 300,000 cps at 730°C. Next, dehydrated maleated polybutadiene 100
9 and 28% ammonia water 9.29 (neutralization equivalent 0.
Add 7) and neutralize with stirring, then add water to adjust the nonvolatile content to 30%.
〔製造例2′ 〕
ポリブタジェンB(数平均分子量2.000 ; l、
4−シス型72%、l、4−トランス型27%及び1
.2−ビニル型1%)175g、無水マレイン酸24り
及びキシレンloomtをオートクレーブに封入し、窒
素ガスで充分置換した後90回転/分の速度で攪拌しな
がら180〜200℃で4時間加熱してマレイン化反応
を行なう。反応汲水で洗浄しキシレン及び未反応の無水
マレイン酸を除去する。得られA台
たマレイン化ポリブタジェンの酸化は99で脱水後の粘
度は約47 cps / 30°Cであった。次に脱水
したマレイン化ポリブタジェン100fを取り50%の
NaOH水溶液8.49 (中和当量0.6)を加え攪
拌しながら中和し、更に水を加えて不揮発分を30%に
調整する。[Production Example 2'] Polybutadiene B (number average molecular weight 2.000; l,
4-cis 72%, l, 4-trans 27% and 1
.. 175 g of 2-vinyl type 1%), 24 g of maleic anhydride, and a room of xylene were sealed in an autoclave, thoroughly purged with nitrogen gas, and heated at 180 to 200°C for 4 hours while stirring at a speed of 90 rpm. Perform maleation reaction. Wash with reaction water to remove xylene and unreacted maleic anhydride. The resulting maleated polybutadiene had an oxidation rate of 99% and a viscosity of about 47 cps/30°C after dehydration. Next, 100f of the dehydrated maleated polybutadiene is taken, and 8.49 g of a 50% aqueous NaOH solution (neutralization equivalent: 0.6) is added to neutralize it while stirring, and water is further added to adjust the nonvolatile content to 30%.
〔製造例3′〕
硫酸第1鉄及び硫酸第2鉄の各1モル/を水溶液をFe
2+ :Fe8+= 1 : 2となるよう混合した水
溶液2tに3Nのアンモニア水をPHがl000になる
まで加えた後、60℃で50分間熟成してマグネタイト
コロイドを得た。[Production Example 3'] An aqueous solution of 1 mol each of ferrous sulfate and ferric sulfate was
After adding 3N ammonia water to 2 tons of an aqueous solution mixed so that 2+:Fe8+=1:2 until the pH reached 1000, the mixture was aged at 60° C. for 50 minutes to obtain a magnetite colloid.
〔製造例4′〕
硫酸マンガン、硫酸亜鉛、硫酸第2鉄の各1モル/を水
溶液をMn2ヤニ Zn2ヤニ Fe8ヤ=0.5:0
.5:2で全量が2tとなるよう分取混合し、これに6
NのNaOH水溶液をPHが1O00になるまで攪拌し
ながら加えた後、液温を80℃として10分間熟成し、
Mn−Znフェライトのコロイドを得た。[Production Example 4'] Add 1 mol each of manganese sulfate, zinc sulfate, and ferric sulfate to an aqueous solution of Mn2, Zn2, and Fe8 = 0.5:0.
.. Mix in a ratio of 5:2 so that the total amount is 2 tons, and add 6
After adding a NaOH aqueous solution of N while stirring until the pH reached 1000, the solution temperature was set to 80°C and aged for 10 minutes.
A colloid of Mn-Zn ferrite was obtained.
〔実施例1’〕
製造例3の湿式法によるマグネタイトコロイドO,St
に製造例1で得たマレイン化ポリブタジェンのアンモニ
ア中和物の30%水溶液701を液温80℃で徐々に加
え、添加後更に同じ温度で3時間攪拌下に吸着反応を継
続した。得られた液体は安定な磁性流体で、室温で1週
間放置しても上澄部分や沈降部分を生じなかりた。[Example 1'] Magnetite colloid O, St produced by the wet method of Production Example 3
A 30% aqueous solution 701 of the ammonia-neutralized maleated polybutadiene obtained in Production Example 1 was gradually added to the mixture at a liquid temperature of 80°C, and after the addition, the adsorption reaction was continued at the same temperature for 3 hours with stirring. The obtained liquid was a stable magnetic fluid, and no supernatant or sedimentation occurred even after being left at room temperature for one week.
従来の長鎖不飽和脂肪酸を用いる方法の場合、吸着反応
に関与するカルボン酸が長鎖不飽和脂肪酸1分子当り1
個のため、吸着・分散を完全なものにするため、吸着後
PHを酸性に調整し、懸濁液を凝集させ、洗浄をくり返
して、マグネタイト又はMn−Znフ・ライトの長鎖不
飽和脂肪酸の単分子層吸着物を分離し、この親油性界面
を有する単分子層吸着物に各種界面活性剤を添加して安
定な磁性流体を得るのが一般的であり、操作が複雑なも
のであった。In the case of the conventional method using long-chain unsaturated fatty acids, the amount of carboxylic acid involved in the adsorption reaction is 1 per molecule of long-chain unsaturated fatty acids.
Therefore, in order to complete adsorption and dispersion, the pH is adjusted to acidic after adsorption, the suspension is coagulated, and washing is repeated to obtain magnetite or Mn-Zn ferrite long-chain unsaturated fatty acids. Generally, a stable magnetic fluid is obtained by separating a monomolecular layer of adsorbed material with a lipophilic interface and adding various surfactants to the monomolecular layer of adsorbed material having a lipophilic interface. Ta.
これに対して本発明で使用するマレイン化ポリブタジェ
ンの場合、1分子中に複数個のカルボン酸を含有するの
で充分な吸着反応を行なわせればその一方で分散に関与
するカルボン酸も一体化させることが出来るので、吸着
・分散が一工程で済み、長鎖不飽和脂肪酸の場合のよう
に、吸着反応と分散操作を分離する必要がない。On the other hand, in the case of the maleated polybutadiene used in the present invention, one molecule contains multiple carboxylic acids, so if a sufficient adsorption reaction is carried out, the carboxylic acids involved in dispersion can also be integrated. Since adsorption and dispersion can be done in one step, there is no need to separate the adsorption reaction and dispersion operation, as is the case with long-chain unsaturated fatty acids.
しかしながらこの場合、磁性流体を得る基本はマグネタ
イト又はMn −Znフェライトにカルボン酸が化学吸
着することなので、使用するマレイン化ポリブタジェン
の吸着能力(中和当量)が重要である。中和当量は吸着
性からはやや小さいが、分散性からは大きい方が望まし
く、両者のバランスを取る必要があり、0.3〜0.7
のものが好ましい。However, in this case, the basis for obtaining a magnetic fluid is chemical adsorption of carboxylic acid onto magnetite or Mn-Zn ferrite, so the adsorption capacity (neutralization equivalent) of the maleated polybutadiene used is important. The neutralization equivalent is somewhat small from the viewpoint of adsorption, but from the viewpoint of dispersibility it is desirable that it be large, and it is necessary to balance the two, and it is 0.3 to 0.7
Preferably.
又、本発明の場合、得られた磁性流体はポリブタジェン
に由来する二重結合を含有することになり、この二重結
合を利用して他の重合性ビニル単量体との共重合が可能
であり、コアに磁性体微粒子を含有するエマルジーン粒
子や、末端に磁性体微粒子を含有する水溶性重合体の製
造が可能である。Furthermore, in the case of the present invention, the obtained magnetic fluid contains double bonds derived from polybutadiene, and copolymerization with other polymerizable vinyl monomers is possible using these double bonds. It is possible to produce emulgene particles containing magnetic fine particles in the core and water-soluble polymers containing magnetic fine particles at the ends.
〔実施例2′〕
製造例4の湿式法によるMn −Znフェライトコロイ
ド0.5tに製造例2で得たマレイン化ポリブタジェン
のNaOH中和物の30%水溶液80Fを液温70℃で
徐々に加え、添加後、更に同じ温度で4時間、攪拌下に
吸着反応を継続した。得られた液体は安定な磁性流体で
、室温で1週間放置して′も、上澄み部分や沈降部分を
生じなかった。[Example 2'] To 0.5 t of Mn-Zn ferrite colloid obtained by the wet method of Production Example 4, 80% aqueous solution of 30% NaOH-neutralized maleated polybutadiene obtained in Production Example 2 was gradually added at a liquid temperature of 70°C. After the addition of , the adsorption reaction was continued for 4 hours at the same temperature with stirring. The resulting liquid was a stable magnetic fluid and did not form any supernatant or sediment even after being left at room temperature for one week.
〔比較例1’1
製造例Iにおけるマレイン化ポリブタジェンの中和物の
製造で、中和当量を1.0にしたものを使用し、実施例
1と同様に製造例3で得たマグネタイトコロイドに吸着
反応を行なった。得られた液体を室温で放置して、安定
性を調べた所、2日後に沈降部分を生じた。これは、使
用するマレイン化ポリブタジェンの中和当量が高く、マ
グネタイトへの化学吸着が進行しなかったと判断される
。[Comparative Example 1'1 In the production of the neutralized maleated polybutadiene in Production Example I, the neutralization equivalent was set to 1.0, and the magnetite colloid obtained in Production Example 3 was added in the same manner as in Example 1. An adsorption reaction was performed. When the obtained liquid was left at room temperature and its stability was examined, a precipitated portion was formed after 2 days. This is because the neutralization equivalent of the maleated polybutadiene used was high and chemical adsorption onto magnetite did not proceed.
〔比較例2′〕
製造例1におけるマレイン化ポリブタジェンの中和物の
製造で、中和当量を0.1にしたものを使用し、実施例
1と同様に、製造例3で得たマグネタイトコロイドに吸
着反応を行なった。得られた液体を室温で放置して、安
定性を調べた所1日後に上澄み部分と沈降部分を生じた
。これは使用したマレイン化ポリブタジェンの中和当量
が低く、分散性が悪いためと判断される。なお、中和当
量0、1のマレイン化ポリブタジェンの水溶液単独でも
放置で上澄み部分と沈降部分を生じ分散性不足であった
。[Comparative Example 2'] The magnetite colloid obtained in Production Example 3 was prepared in the same manner as in Example 1, using the neutralized product of maleated polybutadiene in Production Example 1 with a neutralization equivalent of 0.1. An adsorption reaction was carried out. The obtained liquid was allowed to stand at room temperature, and its stability was examined. After one day, a supernatant portion and a precipitated portion were formed. This is considered to be because the neutralization equivalent of the maleated polybutadiene used was low and the dispersibility was poor. Note that even when an aqueous solution of maleated polybutadiene having a neutralization equivalent of 0 or 1 was used alone, a supernatant portion and a sediment portion were formed upon standing, resulting in insufficient dispersibility.
Claims (1)
化ポリブタジエンあるいはその塩を主成分とする高分子
界面活性剤を添加して、該界面活性剤を上記懸濁液中の
微粉末表面の単分子層以上吸着せしめることを特徴とす
る共重合性を有する磁性流体の製造方法。A polymeric surfactant containing maleated polybutadiene or its salt as a main component is added to an aqueous suspension of fine ferromagnetic oxide powder obtained by a wet method, and the surfactant is applied to the surface of the fine powder in the suspension. A method for producing a copolymerizable magnetic fluid characterized by adsorbing a monomolecular layer or more of .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8827185A JPS61246262A (en) | 1985-04-24 | 1985-04-24 | Production of copolymerizable magnetic fluid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8827185A JPS61246262A (en) | 1985-04-24 | 1985-04-24 | Production of copolymerizable magnetic fluid |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61246262A true JPS61246262A (en) | 1986-11-01 |
Family
ID=13938229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8827185A Pending JPS61246262A (en) | 1985-04-24 | 1985-04-24 | Production of copolymerizable magnetic fluid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61246262A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4946623A (en) * | 1986-11-07 | 1990-08-07 | Commissariat A L'energie Atomique | Process for the production of a ferromagnetic composition, ferromagnetic liquid crystal obtained by this process and apparatus using said liquid crystal |
-
1985
- 1985-04-24 JP JP8827185A patent/JPS61246262A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4946623A (en) * | 1986-11-07 | 1990-08-07 | Commissariat A L'energie Atomique | Process for the production of a ferromagnetic composition, ferromagnetic liquid crystal obtained by this process and apparatus using said liquid crystal |
US5049307A (en) * | 1986-11-07 | 1991-09-17 | Commissariat A L'energie Atomique | Process for the production of a ferromagnetic composition, ferromagnetic liquid crystal obtained by this process and apparatus using said liquid crystal |
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