RU2648082C1 - Paint coating - Google Patents

Abstract

FIELD: ship building.

SUBSTANCE: invention relates to a multilayer paint coating used in hydraulic engineering, for waterproofing and protection against fouling of concrete and reinforced concrete surfaces operated in sea water. Paint coating contains a primer layer, a layer of the paint composition and a layer of a self-polishing antifouling coating. Primer layer is made of a composition comprising an epoxy diane resin, a coal tar resin, a water soluble solvent dimethyl formamide or dimethyl sulfoxide, or diisopropyl carbonate, a triethylene tetramine hardener agent. Layer of the paint composition is applied to the primer layer after it has solidified. Layer of the paint composition is made of a composition containing an epoxy diane resin, a coal tar, the same water-soluble solvent that is used in the primer, a hardener agent triethylenetetramine and red iron oxide. Further, a self-polishing anti-fouling coating is applied to the layer surface of the paint composition. It is made of a composition comprising an antifouling agent Interswift 6600 based on copper acrylates, modified by nanodispersed low molecular polytetrafluoroethylene with a molecular weight of 1,000–5,000, in an amount of 5–20 % of the weight of self-polishing antifouling composition. In this case, each successive layer of the paint coating is applied after the previous one is hardened to the aftertack degree.

EFFECT: invention provides effective protection against biofouling by marine organisms of concrete and reinforced concrete surfaces of water supply lines of technical water supply of the CHP plants due to the increase in the duration of the biosecurity action, strength and cohesion of its constituent layers.

1 cl, 3 tbl

Description

The invention relates to coatings used in hydraulic engineering, for waterproofing and protection against fouling by marine organisms of concrete and reinforced concrete surfaces operated in sea water.

Known paint coating containing a primer layer and a layer of a paint composition containing a base of epoxy Dianov resin modified with coal tar, pre-stabilized with hexamethylenetetramine, solvent, filler and hardener (see RF patent No. 1624989, IPC C09D 5/08, C09D 163/02 , 1996).

However, the paintwork cannot be applied to a moistened surface or a surface under water.

Also known is a paint coating containing a primer layer and a paint composition layer containing an epoxy Diane resin and additives including coal tar, iron oxide, a water-soluble solvent whose solvating ability is not less than that of water, and an amine type hardener (see RF patent No. 2314328, IPC C09D 163/02, C08L 63/02, C09D 5/08, 2008).

The disadvantage of this solution is the lack of effective protection of concrete and reinforced concrete surfaces of port facilities and pipelines of technical water supply of a thermal power plant against marine fouling by marine organisms.

The problem to which the claimed solution is directed is to ensure the effectiveness of marine organisms against biofouling of concrete and reinforced concrete surfaces of the water pipes of the technical water supply to the CHP, as well as port and hydraulic structures.

The technical result achieved in solving the problem is expressed in providing the possibility of effective protection against marine fouling by biological organisms of concrete and reinforced concrete surfaces of the water pipes of the technical water supply of the thermal power station by increasing the duration of the biosecurity, its strength and adhesion of its constituent layers.

The problem is solved in that the paint coating contains a primer layer, a paint composition layer and a layer of self-polishing anti-fouling coating, while the primer layer is made of a composition comprising epoxy Dianova resin containing in mass. % of its mass:

coal tar 10-40 dimethylformamide or dimethyl sulfoxide or diisopropyl carbonate 20-30 triethylenetetramine 18-25

the layer of the paint composition is made of a composition comprising an epoxy Dianova resin containing in mass. % of its mass:

coal tar 10-50 dimethylformamide or dimethyl sulfoxide or diisopropyl carbonate 10-20 triethylenetetramine 18-25 red iron 7-12

the self-polishing anti-fouling coating layer is made of a composition comprising the known Interswift 6600 anti-fouling composition containing copper acrylates modified with nanodispersed low molecular weight polytetrafluoroethylene with a molecular weight of 1000-5000, in an amount of 5-20 mass. % by weight of anti-fouling composition, in addition, each subsequent coat of paint is applied after curing the previous one to the degree of adhesion upon contact.

A comparative analysis of the totality of the features of the claimed solution with the signs of the prototype and analogues indicates the conformity of the claimed solution to the criterion of "novelty."

The combination of features of the claims provides the claimed technical result, while the features of the characterizing part of the claims provide a solution to a set of functional tasks that provide a solution to the problem of the invention.

A sign indicating that the "primer layer is made of a composition comprising an epoxy Dianova resin containing in mass. % of its mass:

coal tar 10-40 dimethylformamide or dimethyl sulfoxide or diisopropyl carbonate 20-30 triethylenetetramine 18-25 "

provides high adhesion of the primer to the concrete surface and its biocidal nature, which allows prolonging the biocidal effect of the coating during the leaching of biocidal components from the overlying coating layers, as well as the possibility of applying to the wet surface of a pipeline or other structure.

A sign indicating that the "layer of the paint composition is made of a composition comprising an epoxy Dianova resin containing in mass. % of its mass:

coal tar 10-50 dimethylformamide or dimethyl sulfoxide or diisopropyl carbonate 10-20 triethylenetetramine 18-25 red iron 7-12 "

provides high strength of the composition and its biocidality, as well as the possibility of applying to the wet surface of the primer.

In addition, the use of iron minium in addition to coloring the composition at the same time “works” both as its “weighting agent” and as a solid filler, playing the role of rigid reinforcement in the cured epoxy-coal system, which is a high-modulus filler.

In addition, when used as a base in a primer and in a paint and varnish composition of a similar material (coal tar), their good adhesion to each other is ensured.

Signs indicating that the "layer of self-polishing anti-fouling coating is made of a composition comprising the well-known anti-fouling composition Interswift 6600 containing copper acrylates, modified with nanodispersed low molecular weight polytetrafluoroethylene with a molecular weight of 1000-5000, in the amount of 5-20 mass. % of the mass of the anti-fouling composition ”, ensures the biocide of the outer layer of the paint coating, since copper acrylates act as biocides, and the“ slippiness ”of the surface of the outer layer of the paint coating, reducing the possibility of sedimentation of larvae of marine hydrobionts on it.

Signs indicating that "each subsequent coat of paint is applied after curing the previous to the degree of adhesion upon contact", ensure the preservation of the original functionality of each of the layers of paint.

To prepare the primer and paint composition use:

- low molecular weight Diane epoxy resin ED-20, EL-16, E-40 with mol. m. 400-800, epoxy resin according to GOST 10587;

- coal tar obtained by semi-coking of coal and having the following characteristics: density at 20 ± 2 ° C, g / cm ³ 1.02-1.1; refractive index 1.588 ± 0.002; group composition (% by weight), phenols 8-18, paraffins and olefins 4-12, neutral oxygen compounds 20-30; carboxylic acids 1-2; pyridine bases 1-3; aromatic hydrocarbons 22-34);

- iron minium according to GOST 8135;

- triethylenetetramine according to TU 6-02-1099-77 (hardener).

As a solvent, water-soluble solvents are used, the solvating ability of which is not less than that of water, for example dimethylformamide (DMF) according to GOST 20-289-74, or dimethyl sulfoxide (DMSO) according to GOST 46-09-38-18-77, or diisopropyl carbonate.

To prepare an anti-fouling coating, a self-polishing anti-fouling coating based on copper acrylates, for example, manufactured by InternationalPaint (brand name Interswift 6600), is used as the initial base.

The named material is modified (by adding and mixing with it nanodispersed low molecular weight polytetrafluoroethylene (PTFE) in an amount of 5-20% of its mass. Use PTFE with a molecular weight of 1000-5000, consisting of nanofilms with a thickness of 5-25 nm, condensed into micropackets with a diameter of 0, 2-5 microns.

The composition is prepared and used as follows.

When preparing and using a primer, a paint and varnish composition and anti-fouling coating, it is necessary to comply with a known set of safety measures.

To prepare the primer base, an epoxy diane resin and pure (i.e. without modifying additives) coal tar are mixed in the stated proportions. To facilitate the dispersion process and reduce the duration, up to 30% by weight of the base of a water-soluble solvent is added to the base, the solvating ability of which is not less than that of water (for example, dimethylformamide or dimethyl sulfoxide or diisopropyl carbonate).

The finished primer base is packaged in metal tightly closed containers according to GOST 9980.3. Hardener for it (triethylenetetramine) is packed according to TU 6-02-1099. The capacities of the primer components are stored in places protected from direct sunlight, with an air temperature of 5 to 35 ° C. The warranty shelf life of the primer base is 6 months from the date of manufacture. When using the base after the warranty period of storage before using it, it is necessary to control its quality. The guaranteed shelf life of the hardener is determined according to TU 6-02-1099.

To prepare the basis of the paint composition, the epoxy diane resin and coal tar are mixed in the stated proportions. To facilitate the dispersion process and reduce the duration, up to 30% by weight of the base of a water-soluble solvent is added to the base, the solvating ability of which is not less than that of water (for example, dimethylformamide or dimethyl sulfoxide or diisopropyl carbonate).

Iron meerk is also introduced into the base, after which the mass is ground in a ball mill to a degree of dispersion of 40-50 microns along the wedge (GOST 6589-57). The iron minium, in addition to coloring the composition, simultaneously “works” both as its “weighting agent” and as a solid filler, playing the role of rigid reinforcement in the cured epoxy-coal system, which is a high-modulus filler. During deformation of a filled epoxy-coal system, the minium is practically not deformed, since its elastic modulus is many times greater than that of the polymer matrix, therefore, the deformation of the layer of the paint composition occurs only due to the deformation of the polymer matrix.

The interaction of iron minium with the most active functional groups of phenols of coal tar is due to the presence of highly polar hydroxyl groups in phenols. As a result of the reaction, phenolates are formed, which are subsequently catalysts in the polymerization of the epoxy-coal system.

The finished base of the paint composition and its hardener are packaged and stored in the same way as the base and hardener of the primer.

To prepare an anti-fouling coating, its components are mixed in the stated proportions, and then stored in a sealed package (the option of preparing the material immediately before use is preferred).

Before applying the primer, its base and hardener are mixed (the use of the hardener varies between 18-25% by weight of the epoxy-diane resin, and the higher the proportion of such a resin with respect to coal tar, the higher the hardener content in the composition should be).

The primer is applied onto the surface to be protected manually with a brush or roller at an ambient temperature of 5 to 60 ° C. At the same time, metal surfaces must be cleaned to degree 2 according to GOST 9.402, and concrete surfaces must have a roughness class of 3, and surface porosity of up to 10% according to SNiP 3.04.03. The surface may be wet, wet (for example, it may be the surface of the concrete conduit directly, after cleaning it from fouling and washing). Primer consumption is 200 g / m ² .

The next coating layer (layer of the paint composition) is applied after the primer has hardened to the degree of adhesion upon contact - when after contact with its surface the probe is separated clean.

The paint composition is applied to the surface of the primer manually with a brush or roller at an ambient temperature of 5 to 60 ° C. The surface may be wet (due to high humidity in the water conduit cavity). The consumption of the paint composition is 200 g / m ² .

The primer and / or paint composition is diluted (if necessary) with a water-soluble solvent (the solvating ability of which is not less than that of water) to a working viscosity with a VZ-1 viscometer at 20 ± 5 ° С. The amount of solvent introduced must not exceed 20% for the primer and 30% for the paint composition of their mass.

The guaranteed shelf life of the finished primer and paint composition is 2 hours from the date of manufacture.

An anti-fouling coating is applied to the surface of the main composition by airless spray. The optimum fluid pressure at the nozzle exit is 176 kg / cm ² , with a nozzle diameter of 0.46-0.66 mm. This material is one-component and must always be thoroughly mixed with a mechanical stirrer before application. The antifouling coating is applied in two layers 125 microns thick each. The consumption of the modified self-polishing coating is 325 g / m ² per layer.

The declared protective coating meets the standards and requirements listed in table 1.

Table 1 Characteristics of the paintwork Name of indicator Norm Test method The appearance of the coating film Glossy, shades of brown Visually on plates of at least 60 × 90 mm, which are prepared from the material of the product intended for coating. Drying time to degree 3 at 20 ° С, h, no more: according to GOST 19007 - on air 24 - in water 16 Mass fraction of nonvolatile substances,%, not less than 70 according to GOST 17537 Film strength upon impact, cm, not less according to GOST 4765 - on air 40 - in water fifty Film adhesion, not more than: according to GOST 15140 - on air 1 point - in water 1 point Resin viscosity 40-60 according to GOST 8420 (according to a VZ-1 type viscometer with a nozzle diameter of 1 mm at a temperature of 20 ± 0.5 ° C, s) Shelf life of the composition after mixing the components at a temperature of 20 ± 2 ° C, h, at least 2 A 100 g sample is taken into a sealed vessel and left for 2 hours, after which it is mixed and the viscosity is checked, which should not change for more than 10 s Film resistance to static action of liquids at a temperature of 20 ± 0.5 ° С, h, not less than: according to GOST 9.403, method A, while the samples are kept in a 3% NaCI solution and distilled water for 24 hours and inspected. The film should be without visible changes. Minor film brightening is allowed. - 5% NaCl solution 24 distilled water 24 - 5% NaOH solution 24 Viscosity Kinematic viscosity of anti-fouling paint coating 224 MPa * s according to GOST 33-2000

The coating can be applied in sea and fresh water at a temperature of at least 5 ° C and can dry in water (at a temperature of at least 5 ° C) to form a hard coating. The coating formed in water is not inferior in its properties to coatings obtained in air.

The service life of the coating applied to protected surfaces operating under water, consisting of the declared paint composition 600-700 microns thick, is at least 6 years.

table 2

Examples of a coal tar paint composition

Table 3

Properties of a composition with coal tar, corresponding to examples of material and quantitative composition

Claims (5)

A paint coating comprising a primer layer, a paint composition layer and a self-polishing anti-fouling coating layer, wherein the primer layer is made of a composition comprising epoxy Dianova resin containing in mass. % of its mass: coal tar 10-40 dimethylformamide or dimethyl sulfoxide or diisopropyl carbonate 20-30 triethylenetetramine 18-25 the layer of the paint composition is made of a composition comprising an epoxy Dianova resin containing in mass. % of its mass: coal tar 10-50 dimethylformamide or dimethyl sulfoxide or diisopropyl carbonate 10-20 triethylenetetramine 18-25 red iron 7-12 the self-polishing anti-fouling coating layer is made of a composition comprising an Interswift 6600 anti-fouling composition containing copper acrylates modified with nanodispersed low molecular weight polytetrafluoroethylene with a molecular weight of 1000-5000, in an amount of 5-20 mass. % by weight of anti-fouling composition, in addition, each subsequent coat of paint is applied after curing the previous one to the degree of adhesion upon contact.