RU2497851C1 - Polymer composition for absorbing high-frequency energy - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates radio-electronic engineering, particularly production of polymer compositions for absorbing spurious radiation in the sealed interior of microwave devices, especially on-board microstrip microwave devices and for making absorbing elements for miniature waveguide devices. The polymer composition for absorbing high-frequency energy contains low-molecular weight synthetic dimethyl siloxane rubber, cold curing catalyst No.68, absorbing filler - radio carbonyl iron R-10 and ethyl silicate-40.

EFFECT: invention provides improved absorption properties in the 8,5-10,5 GHz frequency range, reduced shrinkage, structure uniformity and repeatability of microwave characteristics.

2 tbl, 3 ex

Description

The present 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 airborne microstrip microwave devices and for the manufacture of absorbing elements for miniature waveguide devices.

Absorbing materials are known (composition No. 19 OST 107.460007.006-92 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, wt.h:

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

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

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

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, brittle at small thicknesses.

The closest in technical essence to the proposed polymer composition for absorbing high-frequency energy is [RF patent 2349615 C1 published March 20, 2009] a polymer composition for absorbing high-frequency energy, containing polymer - synthetic rubber, low molecular weight dimethylsiloxane SKTN, the catalyst is a cold curing catalyst No. 68, and absorbent filler, characterized in that as the absorbent filler it contains iron carbonyl radio engineering grade R-10, in the following wear components, in parts by weight .:

Synthetic rubber, low molecular weight dimethylsiloxane SKTN 15-25 Carbonyl iron 78-83 Cold cure catalyst 0.6-1.0

The disadvantage of the prototype is the lack of absorption of high-frequency energy, the operating frequency range, high viscosity and heterogeneity of the structure, because of this inability to use it for the manufacture of thin flat and shaped flexible plates to absorb unwanted types of microwave oscillations in complex microstrip devices and the lack of repeatability of microwave characteristics of elements made from this composition, as well as significant shrinkage, which does not allow the manufacture of precise elements s of this composition.

The technical result of the proposed invention is to obtain a polymer composition with high absorbing properties in a wider frequency range, reducing shrinkage, ensuring uniformity of structure and repeatability of microwave characteristics.

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 absorbing filler, radio-carbon iron radio-technical brand P-10.

New in the proposed polymer composition for absorbing high-frequency energy is the content of ethyl silicate-40 in the following ratio of components, parts by weight:

Synthetic rubber, low molecular weight 15-25 dimethylsiloxane SKTN (TU 2294-002-00152000-96. GOST 13835-73) Cold cure catalyst No. 68 (OST 38.03239-81) 15-25 Iron carbonyl radio engineering R-10 brand (GOST 13610-79) 105-175 Ethyl silicate-40 (GOST 26371-84) 1.5-2.5

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. p / p Components Project 1 Project 2 Project 3 one Synthetic rubber, low molecular weight dimethylsiloxane SKTN (TU 2294-002-00152000-96. GOST 13835-73) fifteen twenty 25 2 Iron carbonyl radio engineering brand R-10 (GOST 13610-79) 105 140 175 3 Catalyst for cold curing No. 68 (OST 38.03239-81) 1,5 2 2,5 four Ethyl silicate-40 (GOST 26371-84) 1,5 2 2,5

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 impossible 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 engineering iron powder it is impossible 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 an increase in SWR. With a decrease in the amount of cold curing catalyst No. 68, the composition does not completely cure.

Table 2 shows the results of comparative tests of the analogue and the inventive polymer composition for the absorption of high-frequency energy

table 2 No. p / p Indicators prototype one Swr 1.5-2.0 1.3 1.35 1.32 2 Frequency Range, GHz 9-10 8.5-10.5 8.5-10.5 8.5-10.5 3 Shrink% 5 2.1 2,5 2.0 four Microwave Repeatability Not secured. Provision. Provision. Provision.

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

- lower SWR ("1.3.435" versus "1.5-2.0");

- a wider range of frequencies ("8.5-10.5" versus "9-10");

- less shrinkage ("2-2.5%" versus "5%")

- repeatability of microwave characteristics.

Claims (1)

A polymer composition for absorbing high-frequency energy, containing polymer - synthetic rubber, low molecular weight dimethylsiloxane SKTN, the catalyst is a cold curing catalyst No. 68, and also as an absorbing filler it contains radio carbonyl radio engineering grade P-10, characterized in that it further contains ethyl silicate-40, in the following ratio of components in parts by weight:
Synthetic rubber, low molecular weight dimethylsiloxane SKTN 15-25 Iron carbonyl R-10 105-175 No. 68 Cold Curing Catalyst 1.5-2.5 Ethyl silicate-40 1.5-2.5