SU943333A1 - Method for producing polymeric coating - Google Patents

Description

The invention relates to an electrochemide, namely, electrophoretic methods for producing coatings on a current-conducting surface, where electrochemical polymerisation of monomers is combined with electrophoresis, and can be used in medicine to obtain coatings with biocompatible properties, also in the paint industry. imparting the surface of metal products of special properties.

A known method of producing coatings by electrophoretic deposition on the metal surface of the polymer from a solution containing the dispersion of the filler 1..

The method consists in electrophoretic deposition on the product surface of a copolymer polyelectrolyte from a solution containing a dispersed filler using a constant electric current. However, the polyelectrolyte solution is unstable over time due to oxidation by oxygen in the air. In addition, the method is complex, since it is necessary to obtain a copolymer polyelectrolyte from monomers and neutralize it in order to increase water solubility; the need for heat treatment of the applied coatings, which makes it impossible to include fillers in the composition of the polymer film, which lose their physicochemical or other properties at high temperature; It is impossible to regulate (in the process of electrophoresis, the molecular weight and composition of the polymer; the use of high voltages during electroplating and electro precipitation; the instability in time of the solution containing high molecular polyelectrolyte and filler, as well as the limited range

15, since soluble polyelectrolytes are necessary for electrophoretic coating.

The purpose of the invention is to intensify the process.

20

This goal is achieved by the fact that, according to the method of obtaining a polymer coating, electrophoretic coating of the metal surface of a solution containing a filler dispersed in it, applied t a solution of a vinyl monomer in a polar solvent, additionally containing an electrically conductive additive selected from a group of sulfuric acid,

30 Roland Sodium, Sodium Perchlorate with

The following ratio of components, May. % "

Vinyl monomer 10-50 Filler 0.5-5

Electroconductive additive O / 5; -1 Polar solvent The rest and electrophoresis is carried out at a voltage of 3-50 V, current density 1 (A / CM 0.5-120 min.

Example 1. A metal product is degreased by known methods, pro. washed with water, and immersed in a bath with a solution of the following composition, wt.%:

Vinyl monomer - methyl methacrylate 5b, 0 Filler graphite (milling degree 0.1 µm) 5.0 Electrically conductive additive sodium perchlorate 1.0 Polar solvent - acrylonitrile Remaining

Crilonitrile is not only a polar solvent, but also a comonomer. The positive pole of the DC source is connected to the body of the bath, and the negative pole to the product. The process is carried out under stirring and tem-. 20-25 sec. the voltage per vine is 3–50 V. With an increase in voltage from 3 to 50 V, the current density increases from 10 to, and the process time decreases from 120 to 0.5 minutes. Under these conditions, electrochemical copolymerization of vinyl monitors is performed with simultaneous electrophoretic precipitation of graphite and the formation of a composite polymer coating, which is then dried at room temperature. Molecular weight. the copolymer in the composite coating decreases with increasing voltage and current density.

The thickness of the coating and its content r | rafit increase with increasing current density and the duration of the process.

Example 2. The metal product degreased by conventional methods, washed with water, dried and immersed in a bath with a solution of the following composition, wt.%:

Vinyl monomer - diacitonacrylamide 10, 0

The filler furatsilin0, 5

Electrically conductive additive sulfuric acid 0.5 Polar solvent - iodine Else

The positive pole of the a-dc source is connected to the body of the bath, and the negative pole to the product. The process is carried out at; 1 mixing and a temperature of 20-25 ° C. Voltages 3-50 V. The current density is regulated by voltage and varies within 10 jA / cM. The thickness of the coating and the content of furacilin in it depends on the process time, which is in the range of 0.5-120 minutes.

With the passage of current through the bath, electrochemical production of diacetone acrylamide occurs simultaneously with electrophoretic deposition of furacilin. A composite polymer coating is formed, which is then dried at room temperature. The molecular weight of the polymer in the composite coating decreases with increasing current density P. reamer 3. The metal product is degreased using conventional methods, washed with water, dried, and lowered into the bath with a solution of the following composition, wt.%: Vinyl monomer — methacrylate methyldiethoxymethylsilane 30, 0

Aerysil2 filler, 0

Electroconductive additive Rodanide sodium 0.8 Polar solvent - dimethylformamide Remaining

The positive pole of the direct current source is connected to the body of the bath, and the negative pole to the end of the bath. The process is carried out with stirring and at a temperature of 20-25 seconds. Voltage 3-50 V. Current density, process duration 0.5-120 min. The thickness of the coating and the content of aerosil in it depends on the current density and the duration of the process. When current passes through the bath at the cathode, a composite polymer coating is obtained as a result of the electrochemical polymerization process of methacrylate methyldiethoxymethylsilane and simultaneous electrophoretic deposition of aerosil. The molecular weight of the polymer in the composite coating is controlled by the current density.

The simultaneous flow of electrochemical polymerization of a vinyl monomer with electrophoretic precipitation of a thromboresistant or antiseptic dispersion makes it possible to obtain, directly on the surface of the product, a polymer coating having a biocompatible property .; there is no need for separate stages of electrophoresis of the syn59433336

Theses copolymer polyelectrolyte, sodium perchlorate with the following

of monomers and its neutralization, as a ratio of components, May. %; also a stage of subsequent thermal Vinyl monomer 10-50 processing of the coatings obtained, which Filler 0.5-5

Significantly simplifies the process. Electroconvolume of the invention Polar solution -.

The method of obtaining the polymer poker

Electrophoretic application of electrophoresis is carried out with a zaprya1G "on a metal surface of a solution of 3-50 volts, a current density of KG Cul / cm pa containing dispersed in 10 iO, 5-120 min.

therein is a filler that distinguishes- sources of information,

Since in order to intensify the process, a vinyl solution is applied to the process during the examination of the process 1. Krylova I., A., Kotlrsky LB,

monomer in a polar solvent Stul T.G. Electrodeposition as an additionally containing an electrode for obtaining paint coatings.

conductive additive selected from M. Chem., 1974, p. 44-60 (proto, sulfuric acid group, natanide nat-type).

5 days supplement 0.5-1

Claims (1)

Claim A method for producing a polymer coating by electrophoretic deposition on a metal surface of a solution containing a filler dispersed in 1C, characterized in that, in order to intensify the process, a solution of vinyl monomer in a polar solvent is applied, additionally containing an electroconductive additive selected from the sulfuric acid group, sodium thiocyanate, sodium perchlorate in the following ratio, May. %: Vinyl monomer 10-50 Filler 0.5-5 Electric wire blowing additive 0.5-1 Polar solution - - riter Rest and electrophoresis is carried out at a voltage of 3-50 V, current density Iff-KGa / cm ¹ (0.5-120 min.