SU1452826A1 - Paint - Google Patents

Abstract

This invention relates to paint and varnish industry, in particular to the preparation of paints used for corrosion protection of pipelines. The invention allows to increase the shelf life of paint.

Description

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FIELD OF THE INVENTION The invention relates to paint and varnish industry, in particular the production of paints, used anti-corrosion protection of pipes, 5 lines.

The aim of the invention is to increase the shelf life of the ink and increase the protective ability of the coating on its base, 10

The paint manufacturing technology is as follows: First, an aqueous aceto acid mixture is obtained. To do this, distilled water is added to acetone, fS then. Orthophosphoric acid. Zinc crowns, a solvent (ethyl or isopropyl alcohol), water -acetoacid-acid mixture and aluminum powder in the specified sequence. In the paint preparation process, thorough mixing is required after the introduction of each component. After mixing, the paint is passed through a paint mill, diluted with a solvent to a working viscosity and filtered through a metallic joint.

mesh.

On a metal surface

The paint is applied by any of the known components of the methods. The resulting coating must- Components but contain at least two layers. 5 paint and have a thickness of at least 100 microns after curing. Cold air drying time between layers

30-40 min.

Bakelite dd lacquer based coatings are extremely sensitive to hot drying. In cold air-drying for 1.5-2 hours, up to 50% of the solvent is released from the coating. To remove the residual g solvent, it is necessary to heat the coating to 75-80 ° C and keep it at this temperature for 2-3 hours. If the coating is heated without this exposure, then at a temperature of 80 ° C, bubbles begin to appear on the surface of the coating whose dimensions increase with increasing temperature. In this case, the formation of bubbles occurs as a result of intensive discharging of ethanol, the boiling point of which is After hot drying for 8 hours in

Coverage practical voritel. Od expose to temperature, again, by temperature, the formation of water vapor in the flowing fields. For processes, the claim is not covered at 9

Thus, it is necessary to drive a hot mode: cold 1.5-2 hours, for 3 hours, after the treatment, up to 9 times the heating for this hot sushi (pipe) is removed (bottom of the chamber, intensive bath in air

The compositions

Bakelite

Zinc to

Aluminum

powder

Orthophosphoric acid

Acetone

Distilliro on water

Organic Dissolve (Ethyl

ISOPROP1GS

alcohol)

practically no solvent remains. However, if this coating is subjected to intensive heating to a temperature, bubbles appear on its surface. The reason for the formation of bubbles in this case is the rapid release of water vapor as a result of rapidly proceeding polycondensation processes. To eliminate the influence of these processes, it is necessary to maintain the coating at 95-100 ° C for 1-2 hours.

Thus, to obtain a high-quality coating, it is required to perform hot drying in the following mode: cold air-drying for 1.5-2 hours, heating to and holding for 3 hours, then raising the temperature to 95 ° C and drying for 2 hours, and then heating to 160 ° C and heat treatment at this temperature for 1 hour. After hot drying, the painted products (pipes) are removed from the drying unit (low-temperature furnace, chamber, bath, etc.) and subjected to intensive cooling (quenching) in air at 18-23 WITH

The paint compositions are given in Table 1.

Table 1

Content, May,%, composed

78

eight

five

76 6

74 4

0.65 1 11.5

1.3 2

0.35 0.5 0.7

1452826

Table 2 presents the data (ACE medium; 0.5% CH CHOO; 5% NaCl;

on physicomechanical properties; in table 3 - test results

3000 mg / l HjO, exposure time 15 days (360 hours),).

(Wednesday ACE; 0.5% CH COOH; 5% NaCl

3000 mg / l HjO, exposure time 15 days (360 hours),).

.Table 2

Adhesion method of grating, score

Flexural strength, mm Impact strength,

KGS SM

Paint storage time, days

Protective ability of the resulting coating in seawater, year, depending on the curing mode:

cold drying at 18-23 ° C for 2 h

hot drying at 80 ° С for 8 h

hot dry with aging

0.15

0.1 0.6

Claims (1)

Invention Formula Paint., Including bakelite varnish based on phenol-formaldehyde resin, zinc crown, aluminum powder, orthophosphoric acid, organic solvent, which in order to increase the shelf life of the paint and protective ability, it contains organic or ethyl solvent. Sodium alcohol and additionally acetone and distilled water in the following ratio of components, May,%: Table 3 0 five 0 Bakelite lacquer based on phenol-formaldehyde resin Zinc Crown Aluminum powder Orthophosphoric acid Acetone Distilled water Ethyl or isopropyl alcohol 74-78 4-8 5-9 0.65-1.30 1-2 0.35-0.70 7-8