SU1180762A1 - Method of express testing of anti-growth coatings - Google Patents

Abstract

A METHOD FOR ACCELERATED TESTS OF ANTI-GRIPPING COATING, which consists in placing the sample with the test coating in the working medium and rotating it for a predetermined time, then removing the sample from the medium, placing it and rotating it in the control solution, removing it from the solution again and measuring the amount of excreted from the coating into a toxin solution, according to which the properties of the coating are judged, characterized in that, in order to improve the accuracy, after removing the sample from the control solution, the pH of the latter is in the range of 2-3, and then m not less than 3 minutes exposed to ultrasound with a frequency of not more than 22 kHz and a specific power of 0.2-0.3 W per 1 dm of solution. (L with

Description

one

The invention relates to a testing technique, in particular to a method for accelerated testing of anti-fouling coatings.

The aim of the invention is to improve the accuracy of the method.

Figure 1 is a diagram of the device for directly accelerated testing of anti-fouling coatings (POP) in a working environment; Fig. 2 is a schematic of a device for the removal of POP in the control solution in Fig. 2; 3-Scheme of the device for affecting the control solution after soaking the sample with POP.

The method is based on the fact that when the sample is held in the control solution, the toxin released from the POP, which is copper ions, is sorbed by the colloidal solution particles and the vessel walls. When the pH of the solution is adjusted to 2-3, sorption of copper ions ceases. When the control solution is irradiated with ultrasound for at least 2 minutes with a frequency of no more than 22 kHz and a specific power of 0.2-0.3 W per 1 dm solution, all sorbed copper ions pass into the solution, which increases the accuracy of determining their total amount in the control solution .

The method is implemented as follows.

In the container 1 with the working medium 2, a sample 4 with the tested POP is placed on the rotor installation 3 and the motor 5 is switched on. The process of excretion, for example, targeting, of the toxins from the POP is switched on. into the work environment. The temperature is kept constant around. After 100 h, turn off the engine 5, stop the rotor installation 3, remove the sample 4 with toxins-depleted anti-fouling coating on. Based, for example, enamel, it is placed in control solution 6 and rotated with the help of engine 7 at a speed of 30 rpm for 2-4 hours. The leaching process of the toxin from POP to control solution 6 with a pH of 8.1. Copper ions, taken from the POP film of sample 4 into solution 6, are deposited on the walls of tank 8, are sorbed by colloidal particles, are dissolved or precipitated in the form of compounds of divalent copper. Stop7622

Spoke engine 7, inject sample 4 from control solution b and acidify the control solution. with HC acid to pH 3.0. In the acidified solution, the sorption of copper ions is terminated by colloidal particles and the walls of the tank 8. In the control solution 6 a concentrator 9 is placed, which is associated with the magnetostriction

a vibrator 10 and an ultrasonic generator 11, and a control solution 6 is irradiated for at least 3 minutes by ultrasound with a frequency of from 20 to 20 kHz and a specific power in

within 0.2-0.3 W per 1 dm of solution.

When irradiated, there is a sharp increase in the rate of dissolution of copper sorbed on the inner surface of the tank 8 and colloidal

particles contained in the solution due to diffusion and cavitational processes caused by exposure to ultrasound. After 3 min

all the copper compounds sorbed by the walls of the tank 8 and the colloidal particles are transferred in ionic form to the control solution. Thus, the fault associated with the loss of copper due to the absorption of copper ions by the tank walls by 8 n colloidal particles is eliminated. The first test cycle is completed by measuring the ion leaching rate.

copper (V) from POP using the inversion voltammetric method.

In the same sequence, the second cycle of the velocity measurement is carried out. The extinction of copper (V) ions is accomplished.

from POP without complete leaching of toxins from POP.

Pr1-zch en using the data obtained during the experiment

T., K.

T, .- L 1.-.

mg

T - the minimum guaranteed service life POP, days;

T - the duration of the first cycle of testing the samplePOP, days,

Tg - d: duration of the second cycle of testing of the samplePOP, days,

leaching rate of toxins according to the results of the first measurement, µg / cm / day;

the rate of leaching of the toxin from the second measurement; µg / cm

V

minimally lethal rate,

L) The efficiency of toxin targeting, 10 µg / cm / day; K - coefficient of acceleration

re; kim aging POP (for a rotor installation Ku 12),

The minimum guaranteed service life of the EPP is done.

Srig.2

Claims (1)

A METHOD FOR ACCELERATED TESTS OF ANTIFOULING COATINGS, which consists in the fact that the sample with the test coating is placed in the working medium and rotated for a predetermined time, then the sample is removed from the medium, placed and rotated in the control solution, again removed from the solution and the amount released from the coating is measured in a toxin solution, according to which the properties of the coating are judged, characterized in that, in order to improve accuracy, after removing the sample from the control solution, the pH of the latter is set in the range of 2-3, and then not e 3 min affect him ultrasound frequency is not more than 22 kHz and power density of 0.2-0.3 W per 1 dm ³ solution.