Anticorrosive paint composition

 

(57) Abstract:

The invention relates to odnoupakovochnye paint materials containing metal powders, and is intended for the manufacture of single and multilayer coatings of the type primers, enamel for corrosion protection of steel structures, products and equipment operated under conditions of intense atmospheric effects in industrial and civil construction, engineering and hydraulic structures, working in conditions of high humidity, industrial and energy installations, equipment, chemical and petrochemical industries, port facilities, shipbuilding and automotive industry. The proposed composition comprises polyurethane varnish, fine powder of zinc obtained by evaporation of metallic zinc in an atmosphere of neutral gas with subsequent condensation, as the target additives use repellent surface finely powdered zinc - silicon liquid and an organic solvent in the following ratio, wt.%: polyurethane varnish - 13,0-26,0; fine powder of zinc - 63,0-79,0; specified repellent - 1,7-1,9; organic p using the micro-talc for paint industry in the amount of up to 0.5 wt.%. As silicone fluids used polyphenylsiloxane or polymethylphenylsiloxane. The invention allows to obtain tropicoco paint composition with a long shelf life without irreversible changes in properties, providing high corrosion and chemical resistance of the treated surface in corrosive environments at elevated temperatures with enhanced mechanical and adhesive properties. 1 S. and 3 C.p. f-crystals, 2 tab.

The invention relates to odnoupakovochnye paint materials containing metal powders, and is intended for the manufacture of single and multilayer coatings of the type primers, enamel for corrosion protection of steel structures, products and equipment operated under conditions of intense atmospheric effects, including vapors of mineral and organic acids and alkalis, fresh and sea water environments, and can be used in industrial and civil construction, engineering and hydraulic structures, working in conditions of high humidity, industrial and energy installations, equipment, chemical and petrochemical industries, port facilities, shipbuilding and automobilului to weathering polymeric binder, modifying additives, corrosion inhibitors, active fillers.

So, for example, a well-known composition for corrosion protection of steel surfaces containing organorazbavljaemye foaming agent, which is used as a modified polietilenglikolmonostearat resin, and the product of interaction of allyl alcohol and diisocyanate with polyisocyanate (Ed. St. SU N 1473326, IPC C 09 D 5/08, 175/06, 1994).

Known composition provides only mechanical surface protection from atmospheric influences. In operation, the coating cracks, forming cracks, and when the occurrence of surface defects on the coating processes are divided and pitting corrosion.

To improve the mechanical stability of the corrosion-resistant coating known retinoblastoma composition "Uralan", comprising, by weight.h.: binder - polybutadienes a prepolymer, which is a product of the interaction of diisocyanate with polytetrafluorethylen and/or polietilenglikolsuktsinata 100, liquid bitumen 100-80, the filler is powdered minerals (cement, gibs, chalk, kaolin) 2.5 to 5 (Application EN N 94035362/03, IPC C 09 D 175/04, 195/00, C 08 L 95/00, 1996).

Known defects of the surface corrosion protection of the steel surface is insufficient.

To improve the corrosion resistance of known composition containing, by weight. h: binder - waste polystyrene 15-16, coal tar 3.5 and 4.9, the corrosion inhibitor is a derivative of quinoline 0,016-0,02, zinc powder 15-16, aluminum oxide 7-8, the solvent toluene - rest. (Ed.St. SU N 1737909, IPC C 09 D 5/08, C 09 D 125/06, 1998).

The introduction of zinc powder and corrosion inhibitor increases to some anti-corrosion properties, however, to carry out electrochemical (cathodic) protection of the surface using known compositions is impossible, i.e., the coating obtained from the known compositions do not provide corrosion protection for metal surfaces, and is characterized by low adhesion properties.

Closest to the present invention is tropicabana highly anticorrosive paint composition, comprising, by weight.h: binder is a mixture of polyvinyl butyral and polymethylphenylsiloxane 10-15, the filler is a mixture of powdered zinc, alumina and kaolin 110-120, target additive - acid corrosion inhibitor, which is used as an alcoholic solution of polyacrylic and methacrylic acid, and 0.5-3.0 and organic solvent - mixture fairly good corrosion resistance and elasticity, that ensures long-term operation of the product in environments with increased aggressiveness, however, when it is applied on the surface it is difficult to achieve a uniform thickness, and because of the heterogeneity and the looseness of the coating on the individual, the most "weak" areas have pockets of pitting corrosion. Also known composition during formation of the coating does not provide high adhesion to metal, which is necessary to prevent subsurface corrosion and does not provide sacrificial (cathodic) protection of steel, resulting in defective areas covering the pores, scratches, chips - the corrosion of the base metal.

Sacrificial protection vysokoriskovannyh coatings is that the zinc and steel form a galvanic couple, where the zinc is the anode, and the defective places oxidized zinc, not metal, which is coated. At high content of zinc its particles are in contact with each other. This ensures that the electrical conductivity of the coating and cathodic protection of steel. It is known that the effective cathodic protection of steel by cathodic mechanism when using zinc-containing coating is provided when the content of zinc in the dry film pokritiesi with a long shelf life without irreversible changes in properties, provides high corrosion and chemical resistance of the treated surface in corrosive environments at elevated temperatures with enhanced mechanical and adhesive properties.

The problem is solved in that the composition contains a binder powder of zinc, the target additive and the organic solvent, the binder used polyurethane varnish, as a powder zinc use fine powder obtained by gas-phase method by evaporation of metallic zinc in an atmosphere of neutral gas with subsequent condensation, as the target additives use repellent surface finely powdered zinc - silicon liquid in the following ratio, wt.%:

Polyurethane varnish - 13,0 - 26,0

Superfine powder of zinc - 63,0-79,0

Specified repellent - 1,7-1,9

Organic solvent - Rest

The composition may contain rheological additive, which use micro-talc for paint industry in the amount of up to 0.5 wt.%.

As polyurethane varnish use odnoupakovochnye polyurethane La manufactured on the basis of polyester Laprol 5003 or Laprol 4503 with excess diphenylmethanediisocyanate (DHS), which cures at ambient temperature with the formation of the polymer film.

As finely powdered zinc use powder brand PCVD obtained by evaporation of metallic zinc in an atmosphere of neutral gas (inert gas or nitrogen) with subsequent condensation.

As the water-repellent surface of the zinc powder used silicone fluids, such as polyphenyl, polymethylphenylsiloxane.

As the organic solvent used ketones, acetates, hydrocarbons such as white spirit (nefras C4150/200) according to GOST 3134-78, butyl acetate according to GOST 22300-76, and mixtures thereof in an effective ratio.

As a rheological additive use micro-talc for paint industry.

The comparison of the proposed composition with renowned allows to make a conclusion on the compliance of the claimed invention, the criterion of "novelty" because the proposed composition contains a new combination of ingredients in the new proportions.

Superfine powder of zinc and urethane varnishes are widely used in various paint compositions. Their joint use is sionnach, the adhesion and mechanical properties, increasing the shelf life of the composition and providing cathodic protection of the treated surface under the influence of aggressive media at elevated temperatures. Providing cathodic protection is achieved due to the high content of powdered zinc in the composition that provides its content in a coverage of over 80%. In the known zinc-rich compositions introduction the increased amount of zinc powder leads to deterioration of the stability of the composition, coating and aesthetic parameters due to the formation of zinc agglomerates and deterioration of the rheological performance of the paint. In the claimed composition using superfine zinc powder, obtained by evaporation and condensation in the atmosphere of neutral gas with subsequent condensation, adds new properties, which is mainly due to the phase transformation of zinc a solid zinc-vapor-liquid-solid powder zinc), which allows to obtain annealed structure of zinc in the form of dendrites with high plasticity. As identified by the Applicant, the use of this zinc powder can solve the task of providing cathodic protection without the stand is ensured by the properties of the binder and properties of highly dispersed zinc powder. When included in the polyurethane binder superfine zinc powder forms a stable colloidal structure representing interacting micelles formed by particles of zinc, enclosed in a shell binder. The surface of the zinc powder is blocked by a repellent to further increase the shelf life of the composition and recording of rheological additive to provide the desired viscosity. The spherical shape of the zinc particles and the flexible plate form rheological additive provides the opportunity dense homogeneous fluid structure of the claimed composition. The formed micelles containing as the core of zinc particles interact with each other and when cured form a continuous zinc-containing layer, providing a tread surface protection, resistant to water, solvents, acids and alkalis. The zinc content in the dry coating is provided from 80 to 90 wt.%. Continuity and uniformity (homogeneity) of the coating depend on the uniformity and strength of the shell binder on the particles of zinc, which is determined by the declared proportion of the ingredients of the composition. The resulting composition has received a coating characterized by high adhesion to the treated surface, optimal elasticity, resistance to cracking and cracking during operation, corrosion resistance and heat resistance. After drying, the claimed composition of the resulting surface has the form of a smooth film (from gloss to matte) light gray without craters and stains, wrinkles and impurities. All the above allows to make a conclusion on the compliance of the claimed invention, the criterion of "inventive step".

The compositions may be manufactured from known materials by known equipment. This allows to make a conclusion on the compliance of the claimed invention, the criterion of "industrial applicability".

The claimed composition was prepared as follows.

Organic solvent (butyl acetate, white spirit or their mixture in the ratio 1: 1) mixed with water repellent (polyphenylsiloxane or polymethylphenylsiloxane) and rheological additive (micro-talc for paint industry) dissolvere in the claimed amount, is injected under stirring declared amount of finely powdered zinc brand PCVD add urethane lacquer Laptas-2 and reflect the mix of dissolver in the mixer for ripening, then poured into the packaging container. Preparation of samples for testing shall be performed in accordance with GOST 8832, surface preparation - according to GOST 8832 and GOST 9.402. As the material for all kinds of tests, in addition to the strength in bending, use of low-carbon steel type 08 KP, 08 PS, Art.3 with sheet thickness of 10 mm to Prepare a sample surface includes cleaning solvent (acetone, white spirit, solvent N 645, 646, 647, 648) and blasting (sandblasting) processing. The surface roughness by Rz - 30-50 μm. Samples for testing bending strength are prepared according to the applicable standard. If necessary, the composition before application is brought to the desired working viscosity solvents 645, 646, 647 and 648 adding no more than 5 wt.% from its weight. Anticorrosive processing standard steel sample is carried out by pneumatic airless spray or by brush or roller on a previously prepared surface. The resulting coating is dried in natural conditions 15 -120 minutes When determining the drying time and physico-mechanical characteristics of the coating thickness not less than 60-80 μm, which corresponds to layer 1 of the composition. In the evaluation of the protective properties of the coating thickness not less than 70-80 microns (1 layer composition). Perenich properties - 7 days. The drying time is determined according to GOST 19007, the adhesion of the coating to the metal surface evaluated according to GOST 15140, method 2, the impact strength is determined according to GOST 4765. The elasticity of the coating at the bend is determined according to GOST 6806. The density of the ink is determined according to GOST 28513. Viscosity is determined by the viscometer B3-246, the nozzle 4 mm according to GOST 8420. Mass fraction of solids is determined according to GOST 17537. Resistance to static action of liquid media evaluated according to GOST 9.403, method A. Samples have a 25% solutions of sulfuric acid according to GOST 367-73 and sodium hydroxide according to GOST 4328-77. After the test is determined visually the condition of appearance. The condition of the metal under the coating is determined visually, for which the coating is removed with a scalpel. The resistance is determined by OST 6-10-422-78. Resistance at elevated temperatures in the presence of sodium chloride according to ISO 4623. The data obtained are shown in table 2.

As can be seen from the above data, the coatings on the basis of the inventive compositions possess high mechanical properties, high impact resistance and abrasion resistance, resistance to aggressive media that are not sustainable all other zinc-rich compositions: organic dissolve the help use the claimed composition for processing equipment, working in highly corrosive conditions at elevated temperatures, where other known coating ineffective: tanks for storage of iron sulfide to sulfuric acid plants, bins and racks with various mineral fertilizers, sulphur agglomerate ore, protection of tanks and pipes for the storage and transportation of sulfur crude oil and fuel oil, gas purification equipment and other equipment and structures.

The manufacture of the compositions in proportions that do not meet the claimed, reduce kislotostojkuju and chemical resistance, reduced plasticity and retention, loss of protective defense mechanism.

The claimed composition is used as a separate coverage or complex multi-layer coating on previously prepared surfaces of equipment, metal structures and concrete and reinforced concrete constructions, which are used outdoors and indoors at a temperature not exceeding 160oC.

1. Anticorrosive paint composition comprising a binder powder of zinc, the target additive and an organic solvent, wherein the binder and the second method by evaporation of metallic zinc in an atmosphere of neutral gas with subsequent condensation, as the target additive - repellent surface finely powdered zinc - silicon liquid in the following ratio, wt.%:

Polyurethane varnish - 13,0-26,0

Superfine powder of zinc - 63,0-79,0

Specified repellent - 1,7-1,9

Organic solvent - Rest

2. The composition according to p. 1, characterized in that it further comprises a rheological additive, which use micro-talc for paint industry in the amount of up to 0.5 wt.%.

3. The composition according to p. 1, characterized in that the silicone fluid used polyphenylsiloxane.

4. The composition according to p. 1, characterized in that the silicone fluid used polymethylphenylsiloxane.

 

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2 cl, 1 tbl, 8 ex

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