SU1671740A1 - Electrolyte for depositing composite nickel-fluoropolymer coats - Google Patents

Abstract

The invention relates to the galvanic deposition of composite coatings and can be used in the chemical industry, for example, to protect the surface of heat exchange equipment from corrosion. The purpose of the invention is to reduce the cost of the deposition process. The electrolyte for the deposition of composite nickel-fluoropolymer coatings contains components in the following ratio, g / l: aqueous nickel sulfate 42-70, aqueous sodium sulfate 48-80, sodium chloride 6-10, boric acid 6-10, polyvinyl fluoride particles 38-42, nitrogen-containing wastes from the production of caprolactam K-4, K-9 30 - 36. Cheaper prices compared with the known electrolyte are achieved through the use of an electrolyte with significantly lower concentrations of nickel salts and boric acid and as stabilizers of fluoropolymer particles duction instead of expensive and harmful fluorinated surfactants. 1 tab.

Description

The invention relates to the galvanic deposition of composite coatings and can be used in the chemical industry, for example, to protect the surface of heat exchange equipment from corrosion.

The aim of the invention is to reduce the cost of coating deposition.

According to the invention, the electrolyte for the deposition of composite nickel-fluoropolymer coatings contains components in the following ratio, g / l: Nickel sulfate water 42-70

Sodium sulfate water 48-80

Sodium chloride 6-10

Boric acid Polyvinyl fluoride Nitrogen-containing waste from the production of caprolactam K-4, K-9

6-10 38-42

30-36

about vj

h about

To prepare the electrolyte, polyvinyl fluoride with a mole of 500000-600000, a density of 1380-1390 kg / m3 and a particle size of 0.9-1.5 µm, synthesized by aqueous emulsion polymerization of vinyl fluoride, is used as the polymer base. the suspending agent is the use of cationic surfactants K-4 and K-9, which are nitrogen-containing caprolactam production waste and have the following structural structure: K 4

.- .: C11. -CH-.CH9-CH-CH2-CH-.

2 l

CONH20 -NH-C-0 CR

-sn, -sn-si7-sn-

2 I L

COONa CN fh.

Mol.m. 1 10 5 k + p + f + h 4, T.e,

Dots under the sign of communication means the possibility of a different number of functional groups in products of this type.

The number of repeating fragments is determined from the mol. m. supplements.

Similar to K-9

-CHO-CH-CHO-CH-CH-gCHII 2 I

CONH2 OS-NH-C 0 Cr

-sn2-sn.- sigs

COONa f

ten

SI,

I z

 n

h

5, k + p + f + h 9,

Mol.m 1.62 ,,.

Separately, nickel plating electrolyte is prepared with a double concentration compared to the standard Watts electrolyte. Polyvinyl fluoride latex is prepared by dispersing the polymer powder using an ultrasonic treatment in an aqueous polyelectrolyte solution.

Nickel plating electrolyte is mixed with polyvinyl fluoride latex at a certain ratio and the pH of the medium is adjusted to 3.5 with the addition of sulfuric acid.

0

five

0

five

0

five

0

five

0

The electrolyte thus prepared is used for cathode coating at 25-60 ° C and cathode current density of 1.0-2.0 A / dm2. A nickel electrode is used as the anode. After the end of the electrolysis, the coated product is repeatedly washed with warm water and air dried. Then heat treatment is carried out on the gry at 230-250 ° C for 5 minutes. Under optimal deposition conditions, a uniform milky white coating is obtained, containing 18-20% by weight of polyvinyl fluoride.

Examples of the use of the invented electrolyte are given in the table.

As can be seen from the table, an electrolyte is used to precipitate composite nickel-fluoropolymer coatings, in which the concentration of nickel and boric acid salts is several times less than in a known electrolyte.

To stabilize latex, a fluoropolymer additive instead of expensive and harmful fluorinated surfaces is active. substances used cationic aktisnyg., substances produced as waste products. As a consequence, the use of the proposed electrolyte reduces the cost of the deposition of nickel-fluoropolymer coatings,

Claims (1)

Electrolyte for precipitating composite nickel-fluoropolymer coatings containing nickel sulfate, sodium sulfate, sodium chloride, boric acid, fluoropolymer particles, and a cationic surfactant, characterized in that electrolyte is used as a fluoropolymer to reduce the cost of the deposition of coatings. polyvinyl fluoride, and as a cationic surfactant - nitrogen-containing waste from the production of caprolactam K-4, K-9 in the following ratio of components, g / l: Nickel sulfate water 42-70 Sodium sulfate water 48-80 Sodium chloride 6-10 Borna acid6-19 Polyvinyl fluoride38-42 Nitrogen-containing wastes from the production of caprolactam K-4, K-930-36