LT4235B - Method for a formation of electrical conductive coatings on polycaproamidic films - Google Patents

Abstract

This invention presents the production method of electrically conductive coatings on polymers. Electrically conductive selenium coatings on a polycaproamide film are produced by treating the selenium 0.05-01 M in a selenium trithionic acid solution, afterwards flushing it with water and treating it by a solvent of copper salts with hydrochinon. This modified method of the polymer materials is distinguished by better characteristics and may be used for galvanising modifications.

Description

The present invention relates to the modification of the properties of polymeric materials by forming electrically conductive coatings of chalcogenides on their surface, which enables such polymeric materials to be used for electroplating or as flexible conductors.

It is known to obtain electrically conductive sulfide coatings on some polymeric materials (polyamide, polystyrene) by applying the surface of the polymeric material to a solution of metal salts and subsequently to a sodium sulfide solution (see former USSR Author No. l 110819, IPC C 23 C 3/02, 1984).

In this way, polymeric materials do not obtain sufficiently conductive sulphide coatings.

The closest solution to the proposed solution is to obtain electrically conductive sulfide coatings by first polymerizing the substances with an alkaline sulfur solution, washing them with acidified water and then treating them with a copper salt solution (see former USSR Author No. 895542, TPK B 05 D 5 / 12, C 23 C 3/02, 1982).

The resistance of the sulphide coatings thus obtained on the polymers is too high to qualitatively metalize such polymers. The process uses a strongly alkaline sulfur solution for the sulfurization of the polymers, which is not true for all materials. The copper salt solutions used in this method are not stable. Methods for obtaining electrically conductive copper selenide coatings are unknown.

The object of the present invention is to obtain electrically conductive copper selenide coatings on polycaproamide by diffusion of selenium into a polycaproamide solution of acid potassium selenotrithionate K2SeS2O ₆ and by interaction of the selenium diffused into the polycaproamide with copper salts.

The object is achieved by selenium polycaproamide film with 0.05 + 0.1 M acidified potassium selenotrithionate solution, drying and treatment with 0.4 M solution of copper salt with hydroquinone reducing agent.

EXAMPLE:

Polycaproarnide film specimens are exposed to a stirred solution of 0.03-0.2 M potassium selenotrithionate in hydrochloric acid for 50 to 80 ^o C for 60 to 180 minutes, washed

2-4s of water and immersed in a solution of copper salt with hydroquinone containing monovalent copper ions. With this solution at 60-90 ° C, the selenium samples are exposed for 5-20 minutes, then washed with water for 2-4s. The surface impedance of dry polycaproamide film specimens with a copper selenide coating is measured. The surface impedance is 50-260Ω / ΰ. The data are shown in the table.

table

Selenium agent The molar of the solution con- central cation Selenium conditions Copper salts solution composition g · Conditions for exposure to copper salt solution Surface this one impedance, Ω / Π Tem- pera- volume, ° C. Dur- love, min Tem- pera- volume, ° C. Dur- love, min 1 2 3 4 5 6th 7th 8th INVENTION K2SeS ₂ O6 0.05 60 180 Copper Sulfate Crystal Hydrate - 10, Hydroquinone - i.o. Water 100 78 10th 554-60 - »1 - - 150 - J '- - i »- 58-65 - - 90 - J, - 60-65

1 2 3 4 5 6th 7th 8th —I »- 60 - »- -> 1 - —J'— 70-75 —J »- 150 -n- 60 130- 150 —I »- 90 —— 60-70 -J »- 0.03 —J »- 78 250- 275 -M- 0.05 50 - M - 150- 180 —I »- 70 30th —J »- 190- 210 80 —N— 240- 260 —N - 60 150 - n— 20th 60-70 5 220- 250 0.10 90 10th 50-55 - »- —I »- 120 —I »- 55-60 0.20 150 —N— 65-70 ANALOGUE Alkaline sulfur solution 2.0 90 5 Copper sulfate crystal hydrate -io, Hydroquinone - 3, Water - 100 70 l.O. 150- 260

It can be seen from the table that using dilute and acidified solution of potassium selenotrithionate in equivalent hydrochloric acid for selenium production of polycaproamide film specimens and subsequent treatment with a solution of copper salt with hydroquinone gives lower surface resistances than the analogue.

The present invention has the following advantages over the prior art:

- low concentration potassium selenotrithionate acidic solution for selenium polycaproamide;

-makes it possible to significantly reduce the surface resistance of a polycaproamide film and to use such film for electrochemical metallization or as a flexible conductor.

DEFINITION OF INVENTION

Claims (1)

DEFINITION OF INVENTION A process for preparing electrically conductive coatings on polymers, wherein the polymeric materials are sulfurized in an alkaline sulfur solution, washed with acidified water, and then treated with a copper salt solution, characterized in that the polycaproamide film surface impedance is reduced by water and acts on a solution of copper salt with hydroquinone.