RU2384594C1 - Polymer composition for absorbing high-frequency energy - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: composition contains absorbing filler (80-90 pts. wt); BS-10T adhesive - solution of novalac-type polyvinylformalethylal resin in organic solvents (ethanol and ethylacetate) with addition of ethyl orthosilicate, urotropin and quinoline (26-30 pts. wt); and cyclohexanone (15-20 pts. wt). The absorbing filler used is carbonyl iron, alsifer powder, technical carbon P 803 or a dry colloidal-graphite C-1 preparation.

EFFECT: obtained composition has a wide range of operating temperature, increases attenuation of microwave signals and forms a quality coating.

1 cl, 2 tbl

Description

The invention relates to electronic equipment and can be used to absorb high-frequency energy in microwave devices, in particular for coating plates of a radio-absorbing screen.

Known absorbent polymer composition [RF patent 2294347 C1, publ. 02.27.2007] for the absorption of high-frequency energy, including synthetic rubber, 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 Alsiferous powder fractions no more than 63 microns 75-85 Cold cure catalyst 0.6-1

However, it has a complex manufacturing technology of an absorbing alsiferous powder, lack of adhesion to metals.

The composition is viscous, the layer thickness is at least 1 mm.

The closest in technical essence to the proposed polymer composition for absorbing high-frequency radiation is the composition No. 37 [OST 107. 460007. 006-92. Materials for volume absorbers of high-frequency energy] based on carbonyl iron [GOST 13610] and glue BF-4 based on phenol-formaldehyde resin modified with polyvinyl butyral [GOST 12172], the following composition, parts by weight:

Carbonyl iron 75 Glue BF-4 25

However, while ensuring the attenuation of the microwave signal wave (3.45 ÷ 3.5) dB, it has an insufficient operating temperature range (-60 ÷ + 150) ° С under the requirements of [long-term (-60 ÷ + 200) ° С, short-term + 300 ° FROM]. Due to the rapid increase in the viscosity of the composition, it is impossible to apply a high-quality coating over large areas.

The technical result of the invention is to obtain a polymer absorbent composition with a wide range of operating temperatures, an increase in the attenuation of the microwave signal wave and obtaining a high-quality coating (lack of pores).

The essence of the claimed invention lies in the fact that the proposed polymer composition for absorbing high-frequency energy contains an absorbent filler and glue.

New in the present invention is that the polymer composition for absorbing high-frequency energy contains glue BC-10T, which is a solution of novolac type polyvinylformal ethyl resin in organic solvents (ethyl alcohol and ethyl acetate) with the addition of orthosilicon ethyl ester, urotropine and quinoline, and cyclohexanone the following ratio of components, parts by weight:

Glue VS-10T 26-30 Absorbent filler 80-90 Cyclohexanone 15-20

A polymer composition for absorbing high-frequency energy is made by simply mixing the components at room temperature and curing at room temperature for 24 hours, then at a temperature of 180 ° ± 10 ° C for 2-2.5 hours or at a temperature of 145 ° ± 10 ° C 3-4 hours.

Table 1 shows examples of the compositions of the polymer composition for absorbing high-frequency energy.

Table 1 No. p / p Components Examples one 2 3 four 5 6 one. State standard specification 22345-77 glue VS-10T 26 28 thirty 26 28 thirty 2. Iron carbonyl grade R-10 GOST 13610-79 80 84 90 3. Alsiferous powder based on Al-Si-Fe alloy (TU YAEO.005078) 80 84 90 four. Cyclohexanone GOST 24615-81 fifteen eighteen twenty fifteen eighteen twenty

The specified range of components is selected so as to achieve the required absorption of spurious radiation in a closed sealed volume of microwave devices, expanding the range of operating temperatures and obtaining a non-porous coating.

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

table 2 No. p / p Indicators Analog - composition No. 37 according to OST 107.460007.006-92 Examples 1-3 Examples 4-6 one Operating temperature range, ° С -60 ÷ + 150 -60 ÷ + 200 -60 ÷ + 200 2 Service life at elevated temperature, h: + 200 ° C 0 200 200 + 300 ° C 0 5 5 3 Microwave signal attenuation, dB 3.05 ÷ 3.35 3.45 ÷ 3.5 3.45 ÷ 3.5 four Coating porosity Availability absent. absent.

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

- a wider range of operating temperatures ("from -60 to + 200 ° C" versus "from -60 to + 150 ° C");

- the possibility of operation at elevated temperatures (“at + 200 ° C” - 200 hours, “at + 300 ° C” - 5 hours against “0” hours);

- an increase in the attenuation of the microwave signal wave, dB ("3.45 ÷ 3.5" versus "3.05 ÷ 3.35");

- lack of porosity of the coating.

Along with the absorbing fillers indicated in Table 1, carbon of technical grade P 803 (GOST 7885-86) or colloidal graphite dry grade S-1 (TU 113-08-48-63-90) can also be used.

Claims (1)

A polymer composition for absorbing high-frequency energy, comprising an adhesive and an absorbing filler, characterized in that it contains a BC10-T adhesive, which is a solution of novolac type polyvinyl formalethyl resin in organic solvents (ethyl alcohol and ethyl acetate) with the addition of orthosiliconate, urotropine and quinoline and cyclohexanone ethyl ester in the following ratio of components, parts by weight:
Glue BC10-T 26-30 Absorbent filler 80-90 Cyclohexanone 15-20