DE2248533A1 - METHOD FOR GIVING PLASTOMAGNETIC STRUCTURES AN OPTIMAL STRUCTURE OF DEFORMABLE, ELASTIC MATERIAL AND PLASTOMAGNETIC STRUCTURES OBTAINED BY THE METHOD - Google Patents

Description

ÄSS ^ ^U) ^ OCT 2. 1372

HiKrijurg 1, Atönckioi-gsfr / ai

Procedure to create plastomagnetic structures, an optimal structure made of deformable, elastic material and after the V9r_ drive preserved plastomagnetic structures.

The invention is a simple and Ml _- . liger process to give ρ last © magnetic structures an optimal structure made of deformable elastic material.

A plastomagnetic structure is essentially a solid dispersion in which the magnetic glow, usually ferrite (usually barium, Strontium or lead ferrite) »by a structure deformable, elastic material, usually a polymer, are held together. From these plasto, Magnetic structures can be profile parts, plates, tapes, which are usually extruded or calendered are produced, which find great technical application, such as magnets ^

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elements e.g. for refrigerator seals, streets— Badges, school signs, didactic signs etc. Certain mechanical and magnetic properties are required for these structures. from From a mechanical point of view, the structure is better that below the same magnetic conditions holds together better, is more resilient, has greater flexibility and elasticity and can be processed better. From the magnetic point of view, the same is mechanical Conditions and with the same materials used, the structure is better, which is the lower content of tile material, so it is in general the structure is better, in which the magnetic particles are distributed homogeneously in the flexible elastic structure are. The two property groups are available thus contradicting each other. Between a preferred mechanical state, the $ 100 fowl material would be present, and a magnetic optimum which would be present at $ 100 magnetic material there is an optimal ratio - compared to the minimum amount of game material that is suitable to the structure minimal mechanical sigen— to broker deals - in which a homogeneous

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division of the magnetic particles in the Geffige Under these conditions the iron gap between the magnetic particles is actually minimal and therefore the attraction of the structure at its maximum. While it should be noted here that the definition given should not be interpreted strictly scientifically can, as both the mechanical and the magnetic properties of the grain size of the magnetic particles, can be specified who ' that the present invention, which aims at a homogeneous distribution of the particles, an optimal Grain composition assumes that consequently the possibility of achieving an optimal distribution with precisely the optimal grain cohesion · As for the quality of the magnetic used, no object As regards materials constituting the present invention, these may be of the known or also to be developed under Teii in the following examples barium, strontium and Bieihexaferrite are used, which currently only yerwen deten materials.

The frame material is a polymer. As is well known, the polymers originally lie primarily as koi. loidal dispersions in the aqueous phase (latex),

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which optionally contain an emulsifying agent. It is known that the polymer is either in latex form or in solid form, the latter of which is derived from the latex by irreversible coagulation derives. As a result of coagulation, they form less related polymers form a powdery mass. The more cohesive polymers, on the other hand, form a very elastic and deformable, strongly combined clinging body. This second type of polymer is better suited for making pigs for plastomagnetic structures.

Serzeit will be to the plastoraagnetic structures to give the necessary birds, the magnetic Particles in a mechanical stirrer, for example a Banbury or Werner Pfleiderer-Misoher, Busam Men introduced with the solid and adhering Polymermas sen and then the whole thing is ground and mixed. This is the coherent polymer mass Dissected, kneaded and finely divided with great expenditure of energy and under warm conditions. in the As the polymer is kneaded, it becomes nical particles mixed, however, it strives to form a cohesive mass, since a cha_ characteristic property of the polymer is that

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to eilohen with the T, inabesondere if this aind of dera Ellien way to weld, this mass of an extruder or a Ka has been laehher lander sent drives and su processed Strangpressprodukfcen or calendered products. Solvents have sometimes been used to facilitate fragmentation and to attack the solid polymer that has adhered together. However, this lias s takme was quite kosj, playful and also made the process more expensive because the solvent had to be removed afterwards. Despite the use of relatively expensive processes, the plastomagnetic mass had a content of structure material which was clearly "but the desired minimum content, and the magnetic particles were not homogeneously distributed.

The aim of the invention is to avoid the aforementioned ten major parts and the creation of a new procedure ens, by means of which it is possible, a plastic ^ magnetic structure an optimal polymer structure with optimal distribution of the magnetic particles and consequently optimal properties of the magnetic Point of view, to bestow.

It was found that the logical procedure, 309829/0725

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on which the conventional process "is based, has an enormous and almost unbelievable inadequacy, namely, it is inappropriate and implausible if one already has a polymer in liquid form to coagulate it and turn it into a solid one and strongly connected ^ "pendent form hn. Applying irreversible materials in order to then tear it open, crushing, kneading it with force in a brutal way, and sometimes at the beginning and also then repeatedly when rougher sticks meet and stick together again. So up to now, Van has made use of the support of the intermolecular connection in order to unite the colloid parts, among other things to counteract it again later.

The latex is a dispersion of solid polymer particles in the aqueous phase, i.e., scientifically speaking, of colloid particles of the smallest dimensions in the range from 0.04 to 0.2 micron, which make up to 7 $) of the dispersion and especially is suitable for the first deposition on siaf; ne table particles and for entry into the cavities between one and the other particle), in order in this way a ho_

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to enable even distribution of the particles, by which distribution it is possible to control the proportions on the basis of the minimum amount of polymer see which of the l'asse the optimal mechanical Is able to convey characteristics. The Koa_ lesziemng of the colloid particles therefore takes place in si__ Do this by chemical and / or physical means with the elimination of the watery bladder.

In this way, not only savings are achieved, such as "for example in terms of materials, since the Latex costs about half the coagulate and in smaller amounts are used, in terms of strength, since the mixture is a semi-liquid substance is easier and faster, and with regard to systems, since simpler machines are less lower operating costs, but who_ whose magnetic properties are better than E2ja businesses, i.e. seen as a whole, have achieved significant economic advantages.

The invention is explained in more detail on the basis of the following examples with reference to the accompanying drawings explained. Example I describes as Gegenflber_ setting up a conventional system for the manuf.

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development of plastoragnetic structures. Examples II and III show two possible practical embodiments of the invention. The I ¹ Ig, 1 is a block diagram. Many blocks consist of a double rectangle, the first rectangle containing the reference number of the work described and the second rectangle the special properties of the work. Torganges or the material used illustrated in order to explain the conventional method described in Example I in more detail.

You Flg. 2 is a diagram similar to that of FIG. 1, which, however, is based on the procedure Examples II and III refer to the two practical modes of carrying out the invention illustrate.

3 is an empirical graphical representation with double abscissa and double ordinate , with Zfo scales being plotted on the abscissa, of which the descending relates to the matrix material, based on the volume, and the ascending to the magnetic mate rial.

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Example I. As "has already been mentioned, explained

this example the phases, one

conventional method. In. a Banbury - 3yriseher M throw in the following materials: 160.0 kg {about 89 wt .- $, 60 volume #) barium ferrite (1) in the form of epidemics (10) of dimensions between 2.5 and 5 microns (so far) , 15.0 kg of polyethylene chlorine sulfonate: U in the form of solid, coherent rubber-like plates available polymer (2), 7.10 kg (about 4 wt .- ^, 15 vol.-fi>) polyisobutylene ,. a re__ tively solid and coherent, ver_ commercially fÄgbares polymer (>), smaller amounts of Schmier__ medium (4), that 0.4 kg stearic and O _v 3 kg lubricating oil.

Ura _t . At least as far as the polymers (2P) and (3) ». If you have to go back to the origin, these are products of the zoagulation of a latex (2) and (5), which, once coagulated, are from cTer fl- Ässigen phase in (22) and (53.J "is _t liberated. whereby the solids (2P) and (j> P) available who the. These phases, v / hich the Biiaung precede slabs solid polymer vnirden, not previously observed. They are usually carried out in other companies that only specialize in

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the plates themselves are available for general purposes close. For this reason, organic stricbliört are shown. In every year the phases were within the process and regardless of the use, purpose of the polymer and with the precise purpose, one hosogenic, essentially pure chemical compound to create, carried out.

This llischixng was ground and mixed in (IUI), a final temperature has been reached of 12O ⁰ C, which is substantially on a Selb st warming was performed zuröck, which indicates the transition from mechanical energy into thermal iSnergie due to the uber__ excess of applied energy . The at this! 7eise warde compound obtained in (12), and finally granulated in (13) with a press Schneokenstrang__ extruded at a Dtfsentemperatur of about 10O ⁰ C. The strip emerging from the extruder was cooled in (16) and in (17) to saturation with a pulse magnetizer of 20,000 watts / seo. ma £ netized. The cross-section of the now rectangular band was 8 × 3.5 mm and the force of attraction was 27 g / cm.

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Example II.- As in Example I, weighing 160.0 kg

(about 94 wt. - ^ _t 75 yol .- $) ferrite

(l ^f ) of the same quality and grain size distribution used. In rectangles (1) and (1 »), which essentially correspond to aen of FIG. 1, are shown in a much larger bar aie ferrite particles (10). Furthermore, 15.75 kg of a suspension of a polymer in the aqueous phase (2 *) with essentially spherical colloidal particles (20) made of butaiene styrene are chewed. Schuk with a size of essentially 0.04 kis 0.2 microns is used. The whole thing was placed in a long mixer (II ¹ ) with Z-shaped arms, disengaged with a heating device. The mixture

essentially at room temperature "started as soon as the boiling temperature of the water had been reached, the colloidal particles (20) of the polyhutene styrene polymer had already distributed inside the ferrite particles (10), as indicated essentially in the rectangle (H"), where 3 Phases can be differentiated: the aqueous phase (4) the phase of colloidal particles (20 ¹ ) and the ferrite phase (10).

The concentration of suspension (latex) was 66% of rubber, which is a percentage of its weight based on about 6; S una based on aas volume

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corresponds to about 25 ^ the total amount. By continuing to mix for another 15 minutes, the temperature HO reached ⁰ C ₁ wherein the majority of the water (4) has been eliminated, in the course of ISliminiex ung V7 _a ssers the Koalisierung the colloid occurs, particles, such as substantially in a rectangle ( l8) of FIG. 2 is indicated. Then followed the gänzli_ before ülwinierung of water in a Zy lind ermisch he (IS) at 15O ⁰ C for about 10 minutes. The Hasse thus obtained was abgeköhlt and granulated in (12 ^1). Then, starting from this Gra, granulate, a magnetic tape of the same cross section of 8z $ _t 5 on at a Dflsentemperatur of 100 ⁰ C following the same operating conditions as Example I gernäss extruded. The magnetic tape had clearly better magnetic properties than those according to Example I, ie an attractive force of 32g / can.

Example III. l-it the same amount of ferrite,

as in Examples I and

II was applied, were in the same mixer (11) of Example II 20.8 kg of a polymer suspension mixed in the form of IJitrilksutscb.uk. The concen__

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Tration of the suspension "was 50 ^, so that the nitrile rubber was present in a proportion of $ 5.5, equal to about $ 25 of the total volume. The mixture was carried out as in Example II, with the only difference that calcium stearate 0.3% by weight was added as a lubricant -ra nuliemng (12 ¹ ) yielded grains which had been brought into an extruder (13M ei * v_ in the manner described above and extruded into a magnetic tape which had the same cross-section and was magnetized in the same manner as described above The attractive force was even better in this case and was 34 g / cm ·

The improvement achieved is significant. In fact, in comparison with example I achieved an improvement of $ 18.5, whereas in the 3'all of example III in comparison to example I was even $ 22. ·. ■ ·. .

JSs tried to explain this improvement. 309829 / 072S

iäs seems certain that it makes it possible to reduce the percentage of structural material that iron gaps between one particle of tin and the other to reduce what has been attempted in the To highlight rectangles (11) and (19 '). Other ^ On the one hand, you have to consider that, in terms of weight depressed, the quantitative reduction is not exceptional; From 20.1 kg of Example 1 on 10.4 kg, i.e. from 11.12 ^ to 6.115 '', i.e. by 5.1 ^. t7 if you look at this i ^ all volume tr is oh, the reduction after the specific gravity of the gerrit is about one half of that of the Polymers amounts to about 15 / - »· at equals of plasto Magnetic Limaterial occupied volume consequently takes the polymer, which in the according to the invention The material obtained according to the method is present is to 15 V0I.-7J less one. This withdrawn volume is not only for the belittled löiseo ^ Gaps substantially, but is occupied by other ferrite particles. Obviously the clear one is on it Improvement of the magnetic properties for flclr_ respectively. This phenomenon is graphically common. 3 shown, in which on 3 Ahsäisse from the left to the right is the percentage by volume of polymer that is contained in the plastoma ^ netic material,

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and from right to left the percentage by volume of ferrite in the plastomagnetic material is discharged. The mechanical properties are plotted on the left of the ordinate and after these are composed of more than one, an empirical index representative of all properties was selected. The characteristic and critical value for this index is that l ^r inimalwert, aer fflr the Eljj. sticity, flexibility and machinability are required in order to be able to use the plastoragnetic material for the intended purpose. This value is indicated by the dashed line Itnin parallel to the axis of the abscissa. The mechanical properties relate to a material whose components are homogeneously distributed within one another, which is particularly realized by the method according to the invention. All the magnetic properties in g / cm, based on the magnetic tape of the examples with a cross section of 3.5 × 8 mm, are plotted on the right ordinate.

The graph shows that, wgh__ rend the mechanical properties (Eurve Me) long fall off at the beginning and quickly in the end,

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the magnetic properties (curve Ha) rapidly decrease fall. Accordingly, the present invention also makes it possible to work in an interval in which the loss of characteristic mechanical Properties is insignificant, whereas the gain in terms of magnetic attraction is significant will.

Finally, it should be noted that rubber, in order to improve the mechanical properties, is often improve, by adding vulka_ can be nized and then heated to the crosslinking temperature of the rubber. At the herkömra borrowed procedures, it would not only be extremely difficult had been rigorous to add these crosslinking agents to the essentially solid polymer, but would have this, if this possibility had existed, a premature vulcanization in the Bambury-J & Lseher Reason for self-heating during the Uisch process evoked.

According to the invention, however, the Vornaungsmlt tel before the polymer is coafled in a can be added in the most professional manner. The vulcanized temperature is also nowhere near reached, and must

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possibly in the abs eh. read send phase of the 'Ver specially created for this purpose.

The invention has only been exemplified above wise and without any restriction to the The following examples are described and it is of_ It is evident that the invention in its iSingle heiten and in their G-es & ^ theit in z-alilreieher Hin_ looks changed and can be varied without through their frame au iah emerge.

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Claims (1)

P Δ ϊ iä ΰ ϊ A H S P R tf O H Yes IJ method to ρlast © magnetic structures to impart a Polymergefäge, characterized in that the solid i'eilchen aua magnetic material are mixed with the polymer when it is in the form of x'eilchen, at least in suspension in a aqueous phase and that the latter is at least partially removed in the course of the mixing or afterwards. 2. The method according to claim 1, characterized in that ^; ekennzeich__ net that the polymer particles, at least in the aqueous suspension, have a size of less than Own 1 irikron. 5. The method according to claim 1 or 2, characterized in that the polymer in IPora of! Particles, be sti '; i!: It to the Siliiun, ^ of the greed, in I-Onent of the formation and the mixture with the magnet lachen material combined to form a tolloidal egg dispersion in an aqueous phase; will. 309829/0725 4. The method according to address 3 »characterized by aet that χα äer dispersion of the polymer dispersing medium are present. 5. The method according to claim 3 or 4, characterized in that indicates that this is necessary for the formation of the G-eföges The right polymer is part of a latex. 6. The method according to claim 5 »characterized marked__ net that the latex has a high surface tension. 7. The method according to any one of claims 1 "to 6, characterized in that the polymer in the water Serious phase is available in a proportion of $ 40 to $ 75. 8. The method according to any of ^tis 3 would appeal to 7 »by da_ in that during or after the mixing of the magnetic material with the chemical agent or Kol_ loiddispersion the polymer with any phy sikalisehen and / or the like. is coagulated. 9. The method as claimed in one of claims 1 to 8, characterized in that the mixture or its 309829/0725 do Components before, during or on the probe of the KiSCt _- . Process crosslinking agents are added. 10. Method aa.dk one of claims 1 to 9, a & characterized in that oils are mixed in a slow mixer with Z-shaped arms or the like. he follows. 11. Piastomagnotic body, thereby gel-ennzeicli net that it is obtained by -nan in herktfamli_ rather VJeise one after detji procedure according to the claims Treated 1 to 10 Ilasse just produced. 12. Pias toir.a ^ net is oh he li ... Percent at te 11 of less than ^ 0- / j present eats 1 ^ · I'lastor :: aC ' ⁿ Gtischer irbody, dp.durcb geirenuseich net that it has a content of magnetic IT material of more than 70 vol .->. 14 · L-afnetic polytrial body, thereby .'reironnselc ^ net, da ^ s dao roljTierref ^ i'c, v / olehoa ibn iivr holds, van.:rjii-icrt iat. BATH Blank page