LT4111B - Process for preparing the electrical conductive coatings on polyethylene - Google Patents

Abstract

Invention belongs to the domain of polymer substance modification and may be used to create electric conductive sulphide coatings on these, enables these substances to metal-galvanize.To obtain electric conduction coatings on low density polyethylene film, this film is sulphured in 0.002 M politionic acid solution, rinsed with water and treated with CuCl with hydroquinone solution.

Description

The present invention relates to the modification of the properties of polymeric materials and can be used to form electrically conductive sulfide coatings thereon by enabling these materials to be electroplated.

It is known to obtain electrically conductive sulfide coatings on some polymeric materials (polyamide, polystyrene) by applying a metal saline solution to the surface of the polymeric material, later sodium sulfide solution (see former USSR Author No. 1110819, TPK C 23 C 3/02, 1984).

This does not provide sufficient conductive sulfide coatings on some polymeric materials.

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).

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The sulfide coatings thus obtained are not sufficiently conductive on low density polyethylene and are not suitable for further electroplating. The present invention employs a strongly alkaline sulfur solution for the sulfurization of polymeric materials, which is not suitable for all materials. In addition, the copper salt solutions used are not stable.

The object of the present invention is to obtain electrically conductive coatings on low density polyethylene using an acidic sulfur solution - polithionic acids.

The objective is achieved by sulfurizing the polyethylene film with 0.002M H ₂ S _n O 6 of polythionic acid, where n is the average number of sulfur atoms in the molecule, solution, washed with water and treated with a solution of copper salt with hydroquinone.

EXAMPLE:

The low density polyethylene film specimens are exposed to a stirred solution of 0.002M polithionic acid at 60-80 ° C for 304-90 minutes, washed with 2v5s water and immersed in copper

hydroquinone solution containing monovalent copper ions. Sulfurized specimens were exposed to this solution at 50-80 ° C for 0.254-2.5 minutes, followed by washing with water for 2-4 seconds. The surface resistance of dry polyethylene film specimens with copper sulphide coating is measured. The surface impedance is 184-65Ω / Ο. The data are shown in Table 1.

table

Sierra- Solution Sulfurization Copper salts Operation Surface mo molar conditions composition of the solution, copper shs agent concentric g salts impedance, tation solution Ω / Ο conditions Theme Tim Theme Tim brood i, brood i, volume, min volume, min ° C ° C ^Η 2 ^δ 33θ6 0.002 60 60 Copper sulphate crystallohydra- 80 0.5 38-44 • this 10 Hydroquinone 1.1 Water 100 u zz _Zf_ 90 ZZ zz 0.25 35-40 r f _ J! JI - ZZ zz zz 0.5 18-22 tf zz zz zz zz zz 1.0 20-30 ^ zz_ J! she ~ Jf _ 50 2.5 41-48 zz zz 80 30th zz 80 0.5 55-65 ^H 2 ^S 21 ° 6 n 60 90 _zz_ ZZ 1.0 47-50

continuation of the table

Sierra- mo agent Solution molar concentric tation Sulfurization conditions Composition of bath salt solution, g Operation copper salts solution conditions Surface this one impedance, Ω / α Theme brood volume, ° C Tim i, min Theme brood volume, ° C Tim i, min Anal gas v Alkaline sulfur solution ff 2.0 ff 80 ff 5 ff Copper sulphate crystallohydrate 10 Potassium chloride 0.1 Sodium Sulphite 1.0 Water 100 Copper chloride 0.1 Water 100 Kone. hydrochloric acid 0,1 70 ff 1.0 JI _ 40,000- 55000 1200- 1700

It can be seen from the table that using a dilute solution of polythionic acid for sulfurization of the polyethylene film specimens and subsequent treatment with a solution of copper salt with hydroquinone gives the sulfide coatings with ^! significantly lower than the analog impedances.

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

- allows to significantly reduce the surface resistance of low density polyethylene film;

- the use of such a film for electrochemical metallization provides easy coatings of good quality;

- a low concentration solution of polythionic acid is used for the desulphurisation of the polymer, which results in less pollution of the environment; -the materials used are nonspecific and cheap.

Claims (1)

DEFINITION OF INVENTION A process for preparing electrically conductive coatings on polyethylene wherein the polymeric materials are sulfurized, washed with water, and then treated with a saline solution, characterized in that the polyethylene film is sulfurized in a 0.002 M solution of polithithionic acid and exposed to a solution of copper salts with hydroquinone.