RU2781689C1 - Method for producing an anti-vibration magnetic elastic composition - Google Patents

Abstract

FIELD: composite materials production.

SUBSTANCE: invention relates to methods for producing composite materials, in particular magnetic elastic compositions with enhanced damping properties, for use in vibration protection technology, as well as in nano- and space technologies, where it is necessary to control and maintain a minimum level of vibration. A method for producing an anti-vibration magnetic elastic composition includes preparing a composition containing at least a magnetic filler and a binder compound. The magnetic filler is pre-treated with a plasticizer. The binder compound for the preparation of the composition is taken in the amount of 10-90 wt. %. Prepare at least two compositions, followed by their mixing, evacuation and polymerization. The binder compound for the preparation of each composition is chosen in such a way that when the compositions are mixed, the binder compounds do not dissolve in each other and form an emulsion.

EFFECT: invention allows to increase the damping characteristics of the anti-vibration magnetic elastic composition.

8 cl, 1 dwg, 2 tbl

Description

The invention relates to methods for producing composite materials, in particular magnetic elastic compositions with enhanced damping properties, for use in vibration protection technology, as well as in nano- and space technologies, where it is necessary to control and maintain a minimum level of vibration.

A known method for producing an elastic magnet containing a magnetic filler, a polymer, a plasticizer and additives, in which the elastic magnet is obtained according to the technology of processing thermoplastics, while the homogenization of the mixture is carried out with stirring at a temperature of 50 ± 5 ° C until a viscosity of 100-250 poise is reached, and the polymer the base is obtained in the manufacturing process by combining a polyvinyl chloride thermoplastic with polar rubber through a plasticizer, while the components are taken in the following ratio, wt. %:

Powdered magnetic fillers (carbonyl iron, magnetite, ferrite, permalloy) 19.0-80.0 PVC 5.0-31.5 Polar rubbers (nitrile butadiene,
chloroprene, carboxylate) 0.3-10.0 Plasticizers (esters of adipic, sebacic, phthalic acids) 12.0-60.0 Fillers (carbon black, chalk, kaolin) 5.0-11.0 Epoxy resin 3.0 Stabilizers (calcium, barium, cadmium stearates) 0.5-1.0 [RU2316073, IPC H01F 1/113 H01F 1/117, publ. 01/27/2008]

Closest to the claimed invention is a method for manufacturing polymer magnets, in which a powdered magnetic filler is mixed with a low-viscosity non-crosslinked polymer binder and a hardener under vacuum, then molding is carried out by pouring the mixed mass into molds under excessive pressure and polymerizing it at 60 - 120 ° C . [RU2057379, IPC H01F 1/053, H01F 1/113, publ. 03/27/1996 - prototype]

The disadvantage of the above methods is that the resulting compositions do not have sufficient damping properties.

The technical result is to increase the damping characteristics of the anti-vibration magnetic elastic composition.

The technical result is achieved by the fact that the method for producing an anti-vibration magnetic elastic composition includes the preparation of a composition containing at least a magnetic filler and a binder compound, while the magnetic filler is pre-treated with a plasticizer, the binder compound for preparing the composition is taken in an amount of 10-90 wt. %, and also prepare at least two compositions with their subsequent mixing, vacuuming and polymerization, and the binder compound for the preparation of each composition is chosen in such a way that when mixing the compositions, the binder compounds do not dissolve in each other and form an emulsion.

There is a variant in which the composition additionally contains a plasticizer.

There is a variant in which a liquid phenyl silicone compound, a liquid methyl silicone compound, or a liquid urethane compound are used as the binder compound.

There is a variant in which phenyl silicone oil, methyl silicone oil or dibutyl phthalate is used as a plasticizer.

There is a variant in which two compositions are prepared, while the ratio of phenyl silicone compound and methyl silicone compound when mixing the compositions is 1:1.

There is a variant in which two compositions are prepared, while the ratio of methyl silicone compound and urethane compound when mixing the compositions is 1:1.

There is a variant in which three compositions are prepared, while the ratio of methyl silicone compound, phenyl silicone compound and urethane compound when mixing the compositions is 3:3:4.

There is a variant in which carbonyl iron, nickel or permalloy is used as a magnetic filler.

The invention is confirmed by the following examples of implementation.

Example 1. The first composition containing a magnetic filler and a binder compound is prepared as follows.

A liquid phenyl silicone compound is prepared by mixing two components A, B in a ratio of 10:1. Component A contains vinyl groups and the silicone chain itself contains phenyl groups. Component B contains phenyl and hydride groups. Next to the liquid phenyl silicone compound, taken in the amount of 10 wt. %, add carbonyl iron, pre-treated with phenyl silicone oil to form a hydrophobic shell.

The second composition containing the magnetic filler, binder compound and plasticizer, is prepared as follows.

A liquid methyl silicone compound is prepared by mixing two components A, B in a ratio of 10:1. Component A contains vinyl groups and the silicone chain itself contains methyl groups. Component B contains methyl and hydride groups. Next to the liquid methyl silicone compound, taken in the amount of 35 wt. %, add methyl silicone oil and carbonyl iron pre-treated with methyl silicone oil to form a hydrophobic shell.

Then the first and second compositions are mixed with each other in such a way that the ratio of liquid phenyl and methyl silicone compounds is 1:1, intensively stirred with a stirrer, evacuated, poured into a mold and placed in a heating cabinet for polymerization.

The properties of the anti-vibration magnetic elastic composition obtained according to the present example are shown in Table 1 (p. 7, Sample No. 4).

The remaining samples of the anti-vibration magnetic elastic composition were obtained in a similar way, the properties of which are presented in Table 1.

Example 2

The first composition containing a magnetic filler and a binder compound is prepared as follows.

Take a liquid methyl silicone compound brand SKTN, which contains hydroxyl groups. Curing catalyst No. 18, which is a solution of tin diethyl dicaprylate in ethyl silicate-32, is added to it. To a liquid methyl silicone compound, taken in an amount of 30 wt. %, carbonyl iron is also added, pre-treated with methyl silicone oil to form a hydrophobic shell.

The second composition containing the magnetic filler, binder compound and plasticizer, is prepared as follows.

A liquid urethane compound is prepared by mixing toluene diisocyanate and polypropylene glycol PP-2000 in a ratio of 1:2. Next to the liquid urethane compound, taken in the amount of 70 wt. %, add dibutyl phthalate and permalloy, pre-treated with dibutyl phthalate to form a hydrophobic shell.

Then the first and second compositions are mixed with each other in such a way that the ratio of liquid methyl silicone and urethane compounds is 1:1, intensively stirred with a stirrer, evacuated, poured into a mold and placed in an oven for polymerization.

The properties of the anti-vibration magnetic elastic composition obtained according to the present example are presented in table 2 (p. 8, sample No. 4).

The remaining samples of the anti-vibration magnetic elastic composition were obtained in a similar way, the properties of which are presented in Table 2.

Example 3

The first composition containing a magnetic filler, a binder compound and a plasticizer, is prepared as follows.

A liquid methyl silicone compound is prepared by mixing two components A, B in a ratio of 10:1. Component A contains vinyl groups and the silicone chain itself contains methyl groups. Component B contains methyl and hydride groups. Next to the liquid silicone compound, taken in the amount of 80 wt. %, add methyl silicone oil and nickel pre-treated with methyl silicone oil to form a hydrophobic shell.

The second composition containing the magnetic filler, binder compound and plasticizer, is prepared as follows.

A liquid phenyl silicone compound is prepared by mixing components A and B in a ratio of 10:1. Component A contains vinyl groups and the silicone chain itself contains phenyl groups. Component B contains hydride groups. Next to the liquid silicone compound, taken in the amount of 65 wt. %, add phenyl silicone oil and nickel, pre-treated with phenyl silicone oil to form a hydrophobic shell.

The third composition containing a magnetic filler and a binder compound is prepared as follows.

A liquid urethane compound is prepared by mixing toluene diisocyanate and polypropylene glycol PP-2000 in a ratio of 1:2. Next to the liquid urethane compound, taken in the amount of 90 wt. %, add nickel, pre-treated with dibutyl phthalate to form a hydrophobic shell.

Then the first, second and third compositions are mixed in such a way that the ratio of phenyl and methyl silicone, as well as urethane compounds is 3:3:4, respectively, intensively stirred with a stirrer, evacuated, poured into a mold and placed in an oven for polymerization.

The properties of the anti-vibration magnetic elastic composition prepared according to the present example are shown in Table 2 (p. 8, Sample No. 7).

In each of the above examples, the binder compounds are selected in such a way that when mixed they do not dissolve in each other and form an emulsion. Upon completion of the polymerization process, the emulsion turns into a solid composite structure having a phase boundary.

The structure of the anti-vibration magnetic elastic composition obtained in accordance with the exemplary embodiments of the invention is shown in FIG. one.

The resulting samples of the anti-vibration magnetic elastic composition were studied for damping properties by measuring the tangent of the mechanical loss angle tgδ (tgδ is the ratio of the viscous and elastic components of the complex value (E), tgδ=E”/E', where E is the ratio of stress to strain) on the rheometer Physica MCR 302 (Anton Paar) in oscillation mode.

The damping properties of samples of an anti-vibration magnetic elastic composition with different ratios of binder compounds were compared at given strains of 0.2% and 8%.

Table 1 shows data on the tgδ values for samples obtained by mixing two compositions using liquid methyl (Me) and phenyl (Ph) silicone compounds at various ratios, as well as an increase in the damping characteristic of the above samples relative to a sample prepared using one phenyl compound (sample No. 1).

Table 1

Sample No. Binder ratio Loss tangent for deformation 0.2% Loss tangent for deformation 8% Effect relative to sample 1 for 0.2% strain Effect relative to sample 1 for 8% strain one - 0.229 0.301 one one 2 Ph:Me = 19:1 0.236 0.315 1.03 1.05 3 Ph:Me = 3:1 0.277 0.422 1.20 1.40 four Ph:Me = 1:1 0.369 0.547 1.61 1.81 5 Ph:Me = 2:3 0.348 0.564 1.52 1.87 6 Ph:Me=1:3 0.338 0.485 1.47 1.61 7 Ph:Me=1:3* ² 0.388 0.515 1.69 1.71

Note:

No. 1 - Comparative sample prepared using one liquid phenyl compound

No. 7 - sample No. 6 in a magnetic field of 200 mT

Table 2 presents data on the tgδ values for samples obtained by mixing two or three compositions using liquid methyl (Me) and phenyl (Ph) silicone, as well as urethane (Ur) compounds, as well as an increase in the damping characteristic of the above samples relative to the sample based on one composition using one liquid methyl compound (sample No. 1).

table 2

Sample No. Binder ratio tgδ at 0.2% strain tgδ at 8% strain Effect relative to 100% composition at 0.2% strain Effect relative to 100% composition at 8% strain one - 0.339 0.418 one one 2 Me: Ur = 19:1 0.342 0.428 1.01 1.02 3 Me:Ur = 3:1 0.348 0.469 1.02 1.12 four Me:Ur = 1:1 0.439 0.615 1.29 1.47 5 Me: Ur = 2:3 0.438 0.69 1.29 1.50 6 Me: Ur = 1:3 0.474 0.63 1.39 1.50 7 Me:Ph:Ur = 3:3:4 0.494 0.71 1.45 1.69

Note:

No. 1 is a sample prepared using one liquid methyl compound.

From tables 1, 2 it follows that the dependence of the tgδ values of the composition on various ratios of binder compounds in the samples at various deformations is non-linear.

From tables 1, 2 for samples obtained by mixing two binder compounds as one compound is diluted with another, tgδ increases and reaches its maximum value at a ratio of compounds of 1:1.

In addition, Table 1 shows that when a magnetic field of 200 mT is applied to sample no. 6, the loss tangent also increases (see sample no. 7).

Table 2 shows that the anti-vibration magnetic elastic composition based on three binder compounds at their ratio of 3:3:4 (see sample 7) is characterized by the highest values of tgδ relative to other samples from tables 1, 2.

A feature of the anti-vibration magnetic elastic composition obtained by the method described above is the dependence of tgδ on the magnitude of its deformation.

Thus, a method characterized, among other things, by a set of features that distinguish it from the prototype, namely:

- the magnetic filler is pre-treated with a plasticizer, the binder compound for the preparation of the composition is taken in an amount of 10-90 wt. %;

- prepare at least two compositions, followed by their mixing, evacuation and polymerization, and the binder compound for the preparation of each composition is chosen in such a way that when mixing the compositions, the binder compounds do not dissolve in each other and form an emulsion;

allows to obtain an anti-vibration magnetic elastic composition having an improved damping characteristic, and thereby allows the invention to be carried out with the achievement of the claimed technical result.

Claims (8)

1. A method for producing an anti-vibration magnetic elastic composition, including the preparation of a composition containing at least a magnetic filler and a binder compound, characterized in that the magnetic filler is pre-treated with a plasticizer, the binder compound for preparing the composition is taken in an amount of 10-90 wt. %, at the same time, at least two compositions are prepared, followed by their mixing, evacuation and polymerization, and the binder compound for the preparation of each composition is chosen in such a way that when the compositions are mixed, the binder compounds do not dissolve in each other and form an emulsion. 2. The method according to p. 1, characterized in that the composition additionally contains a plasticizer. 3. The method according to paragraphs. 1, 2, characterized in that liquid phenyl silicone compound, liquid methyl silicone compound or liquid urethane compound is used as a binder compound. 4. The method according to paragraphs. 1, 2, characterized in that phenyl silicone oil, methyl silicone oil or dibutyl phthalate are used as a plasticizer. 5. The method according to p. 3, characterized in that two compositions are prepared, while the ratio of the phenyl silicone compound and the methyl silicone compound when the compositions are mixed is 1:1. 6. The method according to p. 3, characterized in that two compositions are prepared, while the ratio of the methyl silicone compound and the urethane compound when the compositions are mixed is 1:1. 7. The method according to p. 3, characterized in that three compositions are prepared, while the ratio of methyl silicone compound, phenyl silicone compound and urethane compound when mixing the compositions is 3:3:4. 8. The method according to p. 1, characterized in that carbonyl iron, nickel or permalloy is used as a magnetic filler.

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