RU2349615C1 - Polymer composition for absorbing high-frequency energy - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: proposed polymer composition contains (in wt pts): synthetic low-molecular dimethylsiloxane rubber CKTH (15-25), cold setting catalyst №68 (0.6-1.0), absorbing filler - P-10 radio carbonyl iron (78-83).

EFFECT: high absorption properties with a small absorption layer.

1 cl, 2 tbl, 3 ex

Description

The invention relates to electronic equipment, in particular to the production of polymer compositions intended for absorption of spurious radiation in a closed sealed volume of microwave devices, especially in on-board microstrip microwave devices. Absorbing materials are known [composition No. 19 OST 107.460007.006-92 Materials for volume absorbers of high-frequency energy] of the following composition: epoxy resin ED-16 GOST 10587-84, polyester No. 1 TU 6-05-1122, talc TU 21-25-207 , carbonyl iron GOST 13610-79, ISO-MTGFA TU 6-09-33, accelerator UP -606/2 TU 6-094136-75 in the following ratio, parts by weight:

Epoxy resin ED-16 - 40 Carbonyl iron - 61.5 Polyester No. 1 - 3 Talc - fifteen

Iso-MGTP based on 100 g of resin ED-16 - 3.86 K MGTPA (where K is the epoxy number of the resin)

Accelerator UP -606/2 per 100 g of resin 1.5 g.

Microwave signal wave attenuation, dB - (0.25 ... 0.64) with a coating thickness of 2 mm.

However, it has an insufficient range of operating temperatures (-60 - +150) ° C, does not withstand prolonged exposure to high humidity, requires a protective coating. It does not provide sufficient absorption of high-frequency energy.

The closest in technical essence to the proposed polymer composition for absorbing high-frequency radiation is [RF patent 2294347 C1, publ. 02.27.2007] a polymer composition for absorbing high-frequency energy, including rubber, synthetic low molecular weight dimethylsiloxane SKTN, absorbing filler powder alsifer fraction of not more than 63 μm and a cold curing catalyst No. 68 in the following ratio, wt.h .:

Synthetic rubber, low molecular weight dimethylsiloxane SKTN 15-25 Alsifer fraction powder no more than 63 microns 75-85 No. 68 Cold Curing Catalyst 0.6-1.0

The disadvantage of the prototype is the complex manufacturing technology of the powder "alsifer" and low absorption properties of the composition with a small thickness of the absorbing layer.

The technical result of the invention is to obtain a polymer composition with high absorption properties with a small amount of applied absorption layer used in on-board microstrip microwave devices.

The essence of the invention lies in the fact that the proposed polymer composition for absorbing high-frequency energy contains a polymer - rubber, synthetic low molecular weight dimethylsiloxane SKTN, and a cold curing catalyst No. 68 (OST 38.03239 - 81), as well as an absorbent filler.

New in the proposed solution is that the polymer composition for absorbing high-frequency energy as an absorbing filler contains iron carbonyl radio engineering grade R-10 in the following ratio of components, parts by weight:

Synthetic rubber, low molecular weight dimethylsiloxane SKTN (TU 2294-002-00152000-96, GOST 13835-73) 15-25 Cold cure catalyst No. 68 (OST 38.03239-81) 0.6-1.0 Iron carbonyl radio engineering brands P-10 (GOST 13610-79) 78-83

A polymer composition for absorbing high-frequency energy is made by simply mixing the components and curing them at room temperature.

Table 1 shows the compositions of the proposed composition for the absorption of high-frequency energy.

Table 1 No pp Components Project 1 Project 2 Project 3 one Synthetic rubber, low molecular weight fifteen twenty 25 dimethylsiloxane SKTN (TU 2294 - 002 - 00152000 - 96, GOST 13835 - 73) 2 Iron carbonyl radio engineering 78 80 83 R-10 brand (GOST 13610 - 79) 3 No. 68 Cold Curing Catalyst 0.6 0.8 1,0 (OST 38.03239-81)

The specified range of components is selected due to the fact that with a decrease in the amount of carbonyl radioactive iron powder it is not possible to achieve the required absorption of spurious radiation in a closed sealed volume of microwave devices, and with an increase in the amount of carbonyl radio iron powder it is not possible to use the proposed polymer composition due to an increase in its viscosity , heterogeneity and reduced elasticity.

With an increase in the number of cold curing catalyst No. 68, the viability of the polymer composition decreases, the viscosity increases, and the presence of unallocated air bubbles leads to a decrease in the absorption of high-frequency energy. With a decrease in the amount of cold curing catalyst No. 68, the composition does not completely cure, and the adhesion of the polymer composition to the metal substrate decreases.

Table 2 shows the results of comparative tests of the analogue and the inventive polymer composition for absorbing high-frequency energy in a twenty-channel waveguide distributor.

table 2 №№ Indicators Analogue Prototype Example Example Example p.p (composition No. 19 (patent one 2 3 OST 2294347) 107.460007.006- 92) one Change 0.25 ... 0.64 0.19 ... 0.88 0.25- 0.23- 0.27- range attenuation 0.79 0.81 0.81 frequencies f = 9- 10) GHz, dB 2 Losses on 1.4 ... 3 Doses 1,5 1.8 2.0 different outputs, dB 3 Thickness 2 2 one one one inflicted absorbing coating mm

As can be seen from the data shown in table 2, the proposed polymer composition for absorbing high-frequency energy has several advantages:

- absorption efficiency with a small thickness of the absorbing layer;

- availability of material;

- use in on-board microstrip microwave devices.

Claims (1)

A polymer composition for absorbing high-frequency energy, containing polymer - synthetic rubber, low molecular weight dimethylsiloxane SKTN, a catalyst - cold curing catalyst No. 68, as well as an absorbing filler, characterized in that it contains R-10 carbonyl carbonyl iron in the following ratio components, parts by weight:
Synthetic rubber, low molecular weight dimethylsiloxane SKTN 15-25 Iron carbonyl R-10 78-83 No. 68 Cold Curing Catalyst 0.6-1.0