RU2228941C2 - Nonfouling coating - Google Patents

Abstract

FIELD: fouling protection. SUBSTANCE: invention relates to nonfouling coating suited to protect underwater parts of ships, equipment and structures operated in aquatic medium against fouling. Fouling of underwater parts of ships with marine organisms causes sharp reduction in ship velocity, elevated fuel consumption, damage of hull and its coating. In order to provide radiation safety of ship surface coating operation, simplicity of deactivating working room (floating dock) and possible environmental consequences resulted from nonfouling coating, invention proposes addition of reflected light contrasting pigment, e. g. crystalline ferric oxide monohydrate (FeOOH), ferric oxide, etc. and scintillator, e.g. anthracene, transstilbene, terphenyl, and similar substances to nonfouling coating composition comprising base ensuring required mechanical properties of coating and beta-active radionuclides suppressing subsidence of propagation stages of fouling organisms due to creation of high radiation doses in immediate proximity to coating. EFFECT: essentially facilitated revealing incidental losses, shavings, splashes, and drops of radioactive coatings, their looking-for and deactivation due to bright coloration (in orange-red shades) and strong scintillation-caused self-luminescence.

Description

The present invention relates to the field of antifouling coatings suitable for protection against fouling of the underwater part of ships, devices and structures operating in the aquatic environment. Fouling of the underwater part of ships by marine organisms leads to a sharp reduction in ship speed, increased fuel consumption, damage to the hull of the vessel and its cover.

Known anti-fouling agents are anti-fouling coatings containing various poisons (fungicides and insecticides), for example KF-751, XB-53, XC-79, KP-24, YaN-7A, which adversely affect the aquatic environment and its inhabitants . The effective period of such coatings usually does not exceed 1.5–2 years, which is associated with a sufficiently high rate of poison leaching from the coating (~ 1 g / m ² · day) necessary to inhibit the life of the fouling agents. Partial solubility of the coating with its significant thickness (0.7-1.8 mm) during operation leads to an increase in the roughness of the underwater surface of the vessels, and hence to increased turbulence in the boundary layer, increased friction resistance and a relative increase in wetted surface.

As a prototype of the invention, the application for the invention No. 98101309/20 (001194) from 01/20/98 can be considered. A non-fouling coating is proposed that provides the suppression of settling of the settling stages of fouling not due to the use of various poisons or narcotics (patent SU No. 1819276 A3), but due to the creation of high radiation dose rates (P≈10 ² -10 ³ R / h) in direct proximity to the coating (d = 0.5-2 mm), which ensures the interruption, thus, the fouling process.

The disadvantage of the proposed technical solution is the significant radiation hazard of technological processes of applying antifouling paintwork, requiring significant safety measures for personnel in the process of painting the surface of the vessel and decontamination of the working room (floating dock).

The aim of the invention is to simplify the processes of ensuring radiation safety of coating the surface of the vessel, decontamination of the premises (floating dock), reducing the environmental effects of exposure to antifouling coating on the environment.

This goal is achieved by the fact that a pigment contrasting in reflected light, for example, crystalline iron oxide monohydrate FeOOH, iron oxide Fe ₂ O ₃ , etc., and a scintillator, for example, anthracene C ₁₄ H ₁₀ , transstilbene C ₁₄ H, are introduced into the composition to obtain a antifouling coating ₁₂ , terphenyl C ₁₈ H ₁₄ and others like them.

Bright staining (in orange-red tones) and strong self-luminescence as a result of scintillation greatly facilitate the identification of the facts of accidental losses, scraps, shedding, splashes and drops of radioactive coatings, their search and decontamination.

Thus, the claimed antifouling coating in comparison with the known ones allows to provide greater radiation safety of the coating process on the surface of the vessel, ease of decontamination of the working room (floating dock) and the possible environmental consequences of exposure to antifouling coating.

An example embodiment of the invention based on epoxy paints in accordance with (MI Finkelstein. Industrial application of epoxy paints and varnishes. - M .: Chemistry, 1983) is given below

1. The composition for coating, parts by weight:

Epoxy Diane resin (ED-20) 70

Aliphatic Amine (PEPA) 7

O-phthalic acid butyl ester (DBP) 12

Crystalline Iron Oxide Monohydrate 5

Transstilbene 5

The preparation of β-active radionuclide ⁴⁵ CA based on the salt of Ca ₂ CO ₃ 1

2. Crystalline iron oxide monohydrate, transstilbene and the preparation of β-active radionuclide are crushed in a mill to a finely divided state.

3. The components of the composition (without PEPA hardener) are mixed in a mixer.

4. Before coating, PEPA hardener is added to the composition and the composition is thoroughly mixed.

5. The coating composition is applied to the surface to be coated with a layer thickness of up to 40 microns and is maintained for initial cure for 24 hours at room temperature. Final curing is carried out in a heat chamber for 8-10 hours at 60 ° C.

Claims (1)

Antifouling coating for protection against fouling of the underwater part of ships, devices and structures operating in the aquatic environment, made on the basis of a composition that includes a base that provides the necessary mechanical properties of the coating, and the addition of β-active radionuclides, which suppress the settling of the settling stages of fouling by creating high radiation dose rates in the immediate vicinity of the coating, characterized in that the composition further comprises a pigment contrasting in reflected light, providing ayuschy coating coloring, and a scintillator, which provides self-luminescence in the dark coating.