Steel undercoat

FIELD: processes adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials, namely for steel covering.

SUBSTANCE: method involves applying undercoat including binding agent on steel substrate; drying thereof up to termination of user's finger sticking to the coated steel surface; immersing the coated surface in water or exposing thereof to atmospheric air having humidity of at least 50%. The binding agent is aqueous silicon dioxide sol having SiO2/M2O mol ratio of at least 25:1, wherein M is summary alkali metal and ammonium ions. In accordance with the second embodiment the coated steel substrate before substrate submersion in water or exposing to humidified air is treated with solution, which increases coating film strength, over at least 80% of steel substrate area.

EFFECT: increased hardness, cohesion, wear resistance, as well as increased corrosion resistance, elimination of air bladders forming.

16 cl, 8 tbl, 15 ex

 

The present invention relates to a method of applying a primer coating to steel. In particular, the invention relates to the coating on the semi-finished steel products, which then have to be assembled using processes with intensive heat treatment methods and covered with a protective coating. Such semi-finished steel products can be used in the shipbuilding industry and for other large-scale structures such as oil platforms, and these include steel sheets, for example, a thickness of 6 to 75 mm, beams, spars, and various steel sections used as rigid walls. The most important process with intensive heat treatment is welding; almost all such semi-finished steel products are welding. Other important processes with intensive heat treatment are cutting, such as flame cutting, plasma cutting or laser cutting, and thermal shaping, when the steel is bent into shape when heated. These steel products are often exposed to the atmosphere during storage prior to Assembly and during Assembly, and they are usually covered with a coating called "priming coating of metal prefabricated or pre-installation primer coating to prevent the corrosion of steel, and euwww before as all steel construction, such as a ship, will be coated with anti-rust paint, resulting in no problem applying a protective coating or the removal of corrosion products of steel. Most shipyards applying primer metal semi-finished product is as one of several treatments carried out on the production line, on which steel, for example, pre-heated, subjected to blasting or blasting to remove scale and corrosion products, put the first coat of metal semi-finished and passed through the drying chamber. In another embodiment, a primer coating of metal semi-finished product can be applied industrial machine for coating or steel supplier until delivery to the shipyard or other Assembly area.

Although the main function of the primer metal semi-finished product is to create a temporary corrosion protection during Assembly, shipbuilders prefer that it was not necessary to remove the primer metal semi-finished product, and you could leave it on steel during Assembly and after Assembly. Thus, steel, primer coated metal semi-finished product, must be able to weld without removing the primer metal semi-finished product and should enable causes the any type of protective anti-corrosion coatings, typically used on vessels and other steel structures, with good adhesion between the primer and then applied coating. Primer metal semi-finished product preferably should have the ability to weld without any negative impact on the quality of welding or the speed of the welding process and should have sufficient heat resistance to the primer metal semi-finished product has maintained its anti-corrosion properties in areas heated when cutting or welding on the opposite surface of the steel.

With the commercial success of primers metal-semi-finished products which are available today, are applied from a solvent of the coating based on prehydrolyzed tetraethylorthosilicate binders and zinc powder. These coatings contain large amounts of volatile organic solvent, usually about 650 g/l to stabilize the coloring binder and be able to apply the product in the form of a thin film, typically of a thickness of approximately 20 μm. Removing the volatile organic solvent can be dangerous to the environment and in many countries is regulated by laws. There is a need to be primed metal semi-finished product, which does not emit or emit much less volatile organic solvent. An example is mi such coatings are coatings described in the publication US-A-888056 and JP-A-7-70476.

Publication JP-A-6-200188 refers to the primers of the metal, semi-finished and mentions the possibility of using water-binder type binder based on water alkaline silicate salt. Coatings containing aqueous alkali metal silicate and powdered zinc, also proposed in the publication GB-A-1226360, GB-A-1007481, GB-A-997094, US-A-4230496 and JP-A-55-106271. Binders based on alkali silicate for anticorrosive coatings also mentioned in the publication US-A-3522066, US-A-3620784, US-A-4162169 and US-A-479824.

In the publication KR-8101300 described the way in which the composition containing alkalitolerant or silicate of an alkali metal, a powder of zinc and alumina powder or the powder of titanium oxide, is applied to the steel sheet and then left for drying at 20°and RH (relative humidity 75%. The document is not mentioned and does not imply any positive impact of these specific conditions of drying or film properties, nor on the rate of occurrence of these features in the film.

Applicants found that a primer coating based on an aqueous alkaline silicate binders can provide adequate protection against corrosion and allow you to expose welding covered with them the steel surface, but create problems when applying them to the top cover. Water Seeley is ATA contain large amounts of alkali metal cations, which are necessary to keep the silicate in aqueous solution, and these ions are still present in the coating after it dries. Applicants have found that if a primer coating containing such large amounts of ions of an alkali metal cover on top of any conventional organic coating and then immersed in water, the formation of bubbles (local delamination of the coating). Conducted tests that showed that this problem can be reduced if the coating is exposed to the atmosphere shortly after priming of the metal, semi-finished or washed before applying the top coating. However, these processes are not compatible with use in modern high performance shipbuilding.

Aqueous sols of silicic acid having a very low content of alkali metal ions, are commercially available, but coverage on the basis of such sols are usually very bad (initial) the strength of the film from the viewpoint of adhesion, cohesion, hardness and resistance to abrasion and water. Such poor physical properties of the coating makes it susceptible to damage during work or during subsequent processing. Because of this, there is a potential need for repair coating with high costs. The proposed condition is improving coatings based on Sol of silicon dioxide is described in the publication US-A-332082, in which add is not miscible with water, an organic amine, in the publication GB-A-1541022, which is added to the water-soluble acrylamide polymer, and in the publication GB-A-1485169, which is added to the silicate Quaternary ammonium or alkaline metal; but such coatings do not reach physical properties similar to the physical properties of coatings based on alkali metal silicates. Coatings on the basis of colloidal solution of silicon dioxide has a low level of education of bubbles when applying the top coating/dip. Although the content of soluble salts and osmotic pressure are low, the bubbles may still occur, since the coating has a very low resistance to the beginning of/the development of education due to their poor physical properties.

There is a need in the aqueous primer metal semi-finished product with a low content of alkali metal ions, which has improved adhesion to the base and superior film strength in the light of the properties discussed above, in order to resist the initiation and development of the bubble.

In addition, there is a need for not forming bubbles aqueous primer for metal semi-finished product, which demonstrates the rapid manifestation of the physical properties of the coating after application of the primer metal semi-finished product, to provide opportunities for the working and processing bases without the risk of damaging the floor.

The method according to the present invention obtain a primer coating steel, which is designed for the Assembly and application of the top coating, offers a solution to the aforementioned problems and disadvantages. The method in accordance with the present invention of applying a primer coating on a steel base with a primer coating containing a binder on the basis of silicon dioxide, characterized in that the binder contains an aqueous Sol of silicon dioxide, having a molar ratio of SiO2/M2O, where M represents the total number of ions of the alkali metal and ammonium ions, of at least 6:1, and the fact that after the primer coating has dried to the disappearance of stickiness with a weak touch of a finger, covered with a basis immerse in water or other solution is kept in an atmosphere with a relative humidity of at least 50%.

The present invention also relates to a method of applying a primer coating steel substrate with a primer coating containing silicate or silicate binder, where the binder comprises an aqueous Sol of silica or alkali metal silicate having a molar ratio of SiO2/M2O, where M represents the total number of ions of the alkali metal and ammonium ions, of at least 25:1, and the de after as a primer coating has dried to the disappearance of stickiness with a weak touch of a finger, covered with a basis to immersion in water or storage in an atmosphere with a relative humidity of at least 80%, is treated with a solution that increases the strength of the film.

The term "until the disappearance of adhesion is weak when you touch your finger", as used hereinafter in the description to characterize the degree of drying of the coating is the standard adopted in English-speaking countries the technical term is"touch dry") and it means such a state of drying, when weak, i.e. practically without clicking, touching it with your finger is not felt sticky. Thus, this term corresponds to the term "drying to a tack-free", used for similar purposes (i.e. to characterize the degree of drying of the coating) in Russian literature.

Suitable for the purposes of the present invention the solution, which increases the strength of the film, is a solution that enhances the strength of the film primer coating and/or accelerates the manifestation of the strength of the film in time.

The binder in the most preferred is a binder based on water Zola silicon dioxide. Such sols are delivered by the company Akzo Nobel under the registered trade name "Bindzil or f is rmoi DuPont under the registered trade name "Ludox", although in the literature related to them, it is emphasized that conventional varieties of colloidal silicon dioxide are not a good film-forming agents. Available in various grades Zola having different particle size of colloidal silicon dioxide and containing various stabilizers. The particle size of colloidal silicon dioxide, for example, may be in the range from 3 to 100 nm; particle size closer to the lower bound of the range, for example from 5 to 22, is preferred. It is established that the composition containing the binder with the particles of colloidal silica with an average particle size equal to or less than 16 nm, preferably equal to or below 10 nm, sufficiently demonstrate the properties of the method of the present invention to dispense with the need to process the coated surface with a solution that increases the strength of the film. In the case of compositions containing the binder with the particles of colloidal silica with an average particle size of more than 16 nm, treated with a solution that increases the strength of the film can provide an obvious advantage, especially when covered with a basis then immerse in water or stand in an atmosphere with a relative humidity of at least 80%.

The Sol of silicon dioxide has a molar ratio of SiO2/M2O at least 25:1, is more preferably at least 50:1, and may have a molar ratio of SiO2/M2About 200:1 or more. In addition, you can use a mixture of two or more colloidal solution of silicon dioxide having different molar ratio of SiO2/M2O, where the molar ratio of SiO2/M2O the mixture is at least 25:1. The Sol can be stabilized with alkali, for example sodium hydroxide, potassium or lithium, or Quaternary ammonium hydroxide, or by using a water-soluble organic amine, such as alkanolamine. One example of such sols is the product Bindzil® 3NH3/220, stabilized ammonium hydroxide, with low content of sodium, which is characterized by the following indicators: a Sol of silicon dioxide with a concentration of 30 wt.%, the average particle size of 15 nm, the molar ratio of SiO2/NH3about 30:1, the ratio of NH3/Na2O about 10:1 or more (30 wt.% SiO2, 0.27 wt.% NH3and <0.1 wt.% Na2O); pH 9,4; slightly turbid liquid of low viscosity with a distinct smell of ammonia; issued by the company Akzo Nobel (Eka Chemicals). Examples of other aqueous colloidal solution of silicon dioxide will be described below.

Preferably, the coating composition should almost not contain any stable ammonium Zola silicon dioxide, as the presence of stable ammonium Zola can adjust the tee to the gelatinization of the composition, in particular, when the binder consists of predominantly stabilized ammonium Zola silicon oxide, and the coating composition also includes a powder of zinc.

The Sol of silicon dioxide may be mixed with a small amount of alkali metal silicate, for example, lithium silicate, sodium silicate is lithium or potassium silicate, or with Quaternary ammonium silicate. Other examples of suitable mixtures of Sol-silicate can be found in the publication US 4902442. Adding a silicate of an alkali metal or ammonium can improve the characteristics of the initial film-forming Sol of silicon dioxide, but the amount of alkali metal silicate should be low enough to have a molar ratio of SiO2/M2O binder Zola at least 6:1, preferably at least 8:1, and most preferably at least more than 15:1. In the case of the present invention a small amount of alkali metal silicate means that the mass ratio of the alkali metal silicate to solo silicon dioxide in the composition is less than 0.5, preferably less than 0.25, more preferably less than 0.1.

The Sol of silicon dioxide alternative or additionally may contain dissolved or dispergirovannoyj organic resin. The organic resin is preferably Soboh the latex, for example, a latex of styrene-butadiene copolymer, latex of styrene-acrylic copolymer latex, a vinyl acetate-ethylene copolymer dispersion polyvinyl butyral, silicone/siloxane dispersion or dispersion of acrylic latex. Examples of suitable latex dispersions, which can be used are XZ94770 and XZ94755 (both Dow Chemicals), Airflex®500, Airflex®ER DEV, Airflex®CEF 52 and Flexcryl®SAF34 (all Air Products), Primal®E-330DF and Primal®MV23LO (both Rohm and Haas), and Silres®MR E, Silres®M50E and SLM 43164 (all Wacker Chemicals). Water-soluble polymers, such as acrylamide polymers, can be used but are less preferred. Organic resins are preferably used in an amount up to 35 wt.% based on solid binder. In the case of compositions containing the binder with the particles of colloidal silica with an average particle size equal to or below 10 nm, the organic resin is preferably used in an amount up to 20 wt.%, more preferably in the amount of 1-15 wt.% based on solid binder. In the case of compositions containing the binder with the particles of colloidal silica with an average particle size of more than 10 nm, for example between 12 and 22 nm, or between 12 and 16 nm, preferably use increases the TES amount of organic resin to 35 wt.% based on solid binder. Higher amounts of organic resin can lead to porosity of the weld during subsequent welding. It was shown that addition of an organic resin improves the adhesion/cohesion, which is measured by the method of cross-hatch test.

Alternative Sol of silicon dioxide may contain silane bonding agents, which contain alkoxysilane group and the organic residue containing functional group such as amino, epoxy or isocyanate group. Silane binding agent preferably is aminosilane, such as gamma aminopropyltriethoxysilane or gamma aminopropyltrimethoxysilane, or a partial hydrolyzate, although epoxysilane, such as gamma glycidoxypropyltrimethoxysilane can also be used. Silane binding agent preferably is present in an amount up to 30 wt.%, for example, 1-20 wt.%, based on silicon dioxide.

The binder in the primer coating may alternatively or additionally contain an aqueous solution of a silicate of an alkali metal or ammonium, stable siliconates, substituted, at least one anionic group with a lower pKa value than the pKa of silicic acid, such as carboxylate or sulphonate group. Such binders are preferably a solution having mo is lnoe the ratio of SiO 2/M2O in the range of from 8:1 to 30:1 and the pH value in the range from 7 to 10.5, prepared by lowering the pH of a solution of silicate and siliconate cationic exchange. Therefore, siliconate can be added in relatively low quantities, for example, at a molar ratio of from 1:2 to 1:20, to the alkali metal silicate with the usual ratio of SiO2/K2O of 3.9:1. Then the amount of solid components can be reduced, in order to facilitate the processing and further improve the stability. At this stage, the solution has a pH of 12-12 .5. The solution is subjected to ion exchange using standard ion-exchange resin. Ions To+replace ions of N+by reducing the content of alkali binder and pH. In the absence of siliconate silicate would gel with decreasing pH. There were obtained clear stable solutions with a pH up to, but not below 8. The obtained binder typically has a molar ratio of SiO2/K2O in the range of 8-20:1 and can be concentrated, if desired, to increase the solids content. The binder is a clear, stable solution, and it is stable in the presence of zinc, but the coating on the basis of such subjected to ion exchange binders has a relatively poor strength of the film in comparison with coatings based on alkaline is silikatnyh binders.

Preferably used binder having a pH value in the range from 9 to 11.5, more preferably in the range from 9.5 to 11. Without claim to any particular theory to explain the effect of pH on the properties of the film it seems that the increase of pH leads to an increase in the amount of soluble silica in solution. This, apparently, has the ability to affect the hardening of the gel in situ after application of the coating composition. In addition, the regulation of pH may be due to the increase shelf life. When the obtained commercial by Zola silicon dioxide can be selected Sol with a high pH value and/or the pH value Zola can be adjusted. The pH value of Zola can be set, for example, adding affecting the pH of the agent that increases the shelf life, such as dimethylaminoethanol (DMAE), or by adding dilute sulfuric acid, or by adding sodium hydroxide.

Primer coating preferably contains zinc powder and/or a zinc alloy. Such zinc powder preferably has a volumetric average particle size from 2 to 12 μm, and most preferably such zinc powder is a product sold by the industry as zinc dust having an average particle size of from 2 to 8 μm. Zinc on Ashok protects the steel by galvanic mechanism and can also form a protective layer of corrosion products of zinc, enhance corrosion protection coating. All or part of the zinc powder may be replaced by zinc alloy. The amount of zinc powder and/or alloy in the coating is typically at least 10% and can reach up to 90% vol. coatings based on the dry film. Powder zinc and/or alloy on the merits can be fully pigmentation of the coating, or may, for example, up to 70%, for example, from 25 to 55% vol. coatings based on the dry film, and the coating also contains an additional corrosion inhibitor, which may, for example, be a molybdate, phosphate, tungstate or Vanadate, described in the publication US-A-5246488, ultrasonically titanium dioxide described in the publication KR 8101300, and/or zinc oxide and/or a filler such as silicon dioxide, calcined clay, aluminum silicate, talc, barites, mica, magnesium silicate or calcined aluminosilicate.

In the case of compositions containing the binder with the particles of colloidal silica with an average particle size equal to or below 10 nm, the amount of powder of zinc and/or alloy in the coating ranges from 40 to 60%, preferably between 45 and 55% vol. coatings based on the dry film. In the case of compositions containing the binder with the particles of colloidal silica with an average particle size above 10 nm, n is the sample between 12 and 22 nm, or between 12 and 16 nm, the amount of powder of zinc and/or alloy in the coating is between 35 and 50%.

However, in combination with pigments based on zinc can be used by other pigments. Examples of other marinkovich pigments are conductive fillers, such as phosphide di-iron (Ferrophos®), micaceous iron oxide, and others. The use of such conductive marinkovich pigments can reduce the zinc content, while maintaining effective corrosion protection. To obtain the optimum properties of the coating, fillers preferably effectively dispersed in the coating composition. Types and sizes used diluents can be selected to obtain the appropriate state of dispersion. For example, when you choose pigment filler Satintone (Lawrence Industries)should be used, the average particle size below 3 μm, preferably below 2 microns.

Preferably the volume concentration of the pigment (GST) in the coating is between 40 and 75%. The concentration of more than 75% of the film characteristics deteriorate, but at a concentration below 40% of the zinc is not enough to ensure effective corrosion protection. In the case of compositions containing the binder with the particles of colloidal silica with an average particle size of below 10 nm, the GST is preferably between 55 and 75%, more than before occhialino between 65 and 75%. In the case of compositions containing the binder with the particles of colloidal silica with an average particle size equal to or more than 10 nm, can be obtained improved initial properties of the coating when using the GST between 40 and 65%, more preferably between 45 and 55%.

The volume concentration of the pigment (GST) is a volumetric percentage of pigment in the dry paint film. The critical volume concentration of pigment (KRCS) is usually defined as the volume concentration of the pigment, in which the binder is present in a quantity just sufficient to create fully absorbed in the layer of binder on phentermineh surfaces and fill all gaps between the particles are tightly Packed system. The critical volume concentration of the pigment can be determined by wetting the dry pigment with quantity of linseed oil, just enough to form coherent (solid) mass. This method gives a value known as the "oil absorption", from which calculate the critical volume concentration of pigment. The method of determining the absorption of the oils described in British Standard 3483 (BS3483).

The solids content in the primer coating is typically at least 15 vol.% and preferably is in the range from 20 to 35 vol.% Bulk soda is the content of solid components is a theoretical value, calculated on the basis of all components present in the coating composition. The coating usually has such a viscosity that it could be easily applied in the usual devices for coating, such as spraying, particularly airless spray or high-volume spray low pressure device (WAND) with a coating having a dry film thickness less than 40 microns, preferably between 12 and 25 to 30 microns.

Optionally, the coating composition may contain additional additives, well known qualified in this field specialists, such as thixotropic agents and/or agents that regulate the rheological properties (organic clay, xanthan gum, cellulose thickeners, preferredability, acrylic compounds, and others), defoamers (especially when there are latex modifiers) and (secondary) increasing the shelf life of fillers such as chromates (e.g., sodium dichromate) or tertiary amines (e.g. triethylamine or dimethylaminoethanol). Preferred thixotropic and/or regulate the rheological properties of the agents are Bentone EW (Element is), which is a silicate of magnesium, sodium (organic clay), Bentonite WH (Rockwood), which is a water-alumosilicate, Laponite (Rockwood), of which the first is hydrated silicate of magnesium, lithium, sodium, and Rheolate 425 (Elementis), which is a patented acrylic suspension in water. Preferred defoamers are Foamaster NDW (Cognis) and Dapro 1760 (Elementis). Preferred secondary increase shelf life extenders are tertiary amines, which provide increased shelf life without chromates. If the secondary which increases the shelf life of the fillers are not present, the coating composition typically has a shelf life of between <1 and 4 hours is Usually sufficient to add only a small amount (of 0.0125-of 0.025 wt.% based on liquid paint) of sodium dichromate, to obtain a shelf life of more than 24 hours higher number usually lead to poor coating properties. Usually covering the system is available in the form of two (or more) component system. Longer shelf life is also in the case of systems containing sols of silica, having a surface modified aluminum oxide. The use of colloidal solution of silicon dioxide with a modified aluminum oxide surface to extend the shelf life of such coating compositions is the subject of a separate patent application.

It is possible to prepare the coating composition prior to application of the coating, for example, by filing and thorough mixing of all components covering the composition of nez the office before applying. This method can also be attributed to the working mixture in the line of components that are present in the composition of the coating. This is particularly suitable for coating compositions, which have a limited shelf life.

Immersion of the coated base in water or other solution before curing in an atmosphere with a relative humidity of at least 50% of the primer coating is dried to such an extent that it will not be sticky at a weak touch of a finger. The time to extinction stickiness with a weak finger contact is usually from about 10 to 15 min at room temperature 15 to 20°or 3 to 4 min at 40°to cover with a dry film thickness (tsp) 15-20 μm. The drying time also depends on air flow and film thickness. At 35°and the air flow of 0.5 m/s drying time of a coating with a dry film thickness of 20 μm is approximately 2 minutes This time can be further reduced by increasing the temperature.

In General, the drying time can be reduced by increasing the temperature of the basics, increasing air temperature, air flow, or by any combination of these methods.

It is preferable to carry out drying of the primer coating at 10-60°C, preferably at 25-50°With forced air flow, site is preferably in a stream of air, at least 0.1 m/s to Achieve rapid drying is a very important condition of the coating on the line work in shipyards and steel mills.

In a preferred method, the coated base is immersed in water. There is no need to immerse the coated base immediately after drying of the primer coating to the disappearance of stickiness with a weak touch of a finger. It is also valid to dry the floor for (much) longer time. However, when the coated base is dipped in water before priming coating dries to the disappearance of stickiness with a weak touch of a finger, usually a deterioration of the properties of the coating.

In another embodiment of the invention covered by the base stand in an atmosphere with a relative humidity of at least 50% after the primer coating has dried to the disappearance of stickiness with a weak touch of a finger. Achieved even faster manifestation of the properties when coated with base stand in an atmosphere with a relative humidity of at least 80%. There is no need to make a covered basis in an atmosphere with a relatively high moisture content after drying of the primer coating to the disappearance of stickiness with a weak touch of a finger. You can also dry the floor for (significantly) breedlines time. In addition, it is possible to dry covered basis in an atmosphere of relatively high humidity.

In order to further accelerate the manifestation of the physical properties of the coated base to immersion in water, or alternatively, to store for some time in an atmosphere with a relative humidity of at least 80%, the core can be processed in solution increases, the strength of the film primer coating. Before applying this solution on the basis of the primer coating should be dried until the disappearance of stickiness with a weak touch of a finger.

This solution can typically be an aqueous solution of an inorganic salt or a solution of a material containing reactive silicon-containing group. Improving the film strength can be determined by a significant increase in hardness, abrasion resistance and usually adhesion. Hardness can be measured using the method of determining the pencil hardness scale (British Standard 3900, part E19 (1999) (pencil hardness required for deflection). Abrasion resistance can be measured using the dual abrasion, in which the coating automatically rubs and which can be carried out dry or wetted with water. Although a significant increase in abrasion resistance in wet or dry sostojanija could be considered as increasing the strength of the film primer coating, it is established that the processing in accordance with the invention improves the abrasion resistance of both dry and wet condition. Adhesion can be measured by the method of cross-hatch test, which is described in British Standard 3900 part E6 (1992).

The number of enhancing the film strength of the solution, not necessarily applied to the primer coating, is typically in the range of 0.005 to 0.2, preferably from 0.01 to 0.08 liters per square meter of the surface of the primer coating (l/m2in the case of coating applied at the standard dry film thickness (15-20 μm). This amount of solution can usually be applied by spraying. Needless to say, the concentration or the volume of solution for further processing must be improved if the coating is applied in larger quantities, for example, when the dry film thickness >20 μm.

When optional damage increases the strength of the film solution is an aqueous solution of inorganic salt, then he usually has a concentration of at least 0.01 M, and preferably at least of 0.03 M solution Concentration of inorganic salts can be up to 0.5 M or 1 M or even more. The inorganic salt may be a salt of monovalent cation, such as a salt of an alkali metal or ammonium, divalent cation, such as zinc, magnesium, calcium, copper (II) ilegales (II), trivalent cation, such as aluminum or cerium (III), or tetravalent cation, such as cerium (IV), and monovalent anion such as a halide, such as fluoride, chloride or bromide, or nitrate, or polyvalent anion, such as sulfate or phosphate. Can also be used mixtures of the above salts. Examples of solutions of inorganic salts, which are found effective are the solutions of magnesium sulfate, zinc sulfate, potassium sulfate, aluminum sulfate, iron sulfate, sulfate, cerium (IV), copper sulfate, sodium chloride and potassium chloride, although chlorides may not be preferred due to their ability to accelerate the corrosion process. The use of zinc sulfate or aluminum sulfate is preferred.

The weight concentration of the solution of the inorganic salt is preferably in the range of 0.5-20 wt.%.

One of the examples of the material containing the active silicon-containing group, is a silicate. Increasing the film strength of the solution may be a solution of alkali metal silicate, such as potassium silicate or lithium silicate, or a solution of ammonium silicate, or it can be siliconed alkali metal, for example a solution of alkylsilane. The preferred concentration of such a solution is in the range of 0.5-20 wt.%.

When n is necessarily caused to increase the strength of the film solution is a solution of inorganic salts or alkali metal silicate, the added material will increase the salt content of the silicate of zinc in the primer coating. This will lead to an increase in osmotic driving force, when the coating is applied to the upper floor, and, consequently, the probability of osmotic blistering when immersed covered the basics. The number of the applied inorganic salts or alkali metal silicate is preferably low enough that the molar ratio of SiO2/M2O binder primer coating remained above 6:1, preferably more than 8:1 and most preferably more than 10:1. To achieve this result, the number of the applied inorganic salt or silicate of an alkali metal to increase the strength of the solution is preferably less than 10 g/m2based on dry weight, most preferably less than 5 g/m2in the case of a coating with a dry film thickness of 15-20 μm.

An alternative example of a material containing reactive silicon-containing group is an alkoxysilane or alloccasion, such as acetoxysilane. For example, it may be tetraalkoxysilane (alkalitolerant), such as tetraethoxysilane or tetraisopropoxide, or tralkoxydim, such as methyltrimethoxysilane (RTMS, Aldrich) or bistrimethylammonium. The alkoxysilane can with erati additional functional groups, for example, tralkoxydim can have the formula RSi(OR1)3where each group R1is a 1-3C-alkyl, and R represents an alkyl or aryl group, substituted amino, alkylamino, dialkylamino group, amide group, halogen atom, urethane, epoxy, isocyanate, aziridine, sulphonate, carboxylate, phosphate, or hydroxyl group. Preferred examples are aminosilane, such as triethoxysilylpropyl (Aminosilane A1100, Witco), triethoxysilylpropyl (Aminosilane A1110, Witco), trimethoxypropylsilane (Aminosilane A1120, Witco), trimethoxypropylsilane (Aminosilane A1130, Witco) or the alkoxysilane may be a bis(tralkoxydim), for example alkylene or polydimethylsilane chain, closed groups-SiOR'3. The alkoxysilane may be at least partially hydrolyzed, for example, can be used partially hydrolyzed tetraalkoxysilane or hydrolyzed allyltriethoxysilane or aminoalkylsilanes. The alkoxysilane is preferably applied from aqueous solution, although the aqueous solution may contain dissolved in water, an organic solvent, for example an alcohol, such as ethanol.

In addition, it was found that orthosilicate in this way are also very effective reinforcing properties of agents. adnie solutions tetraethylorthosilicate (TMOS) and tetraethylorthosilicate (TEOS) are effective agents for further processing. The best results are obtained if TMOS or TIMES thrown hydrolysis at pH 1-2. At this pH value the shelf life of the solutions for the subsequent processing may exceed 7 days.

The concentration of alkoxysilane or orthosilicates in optional caused by solution treatment is preferably in the range of 1-25 wt.%.

Using alkoxysilanes and/or orthosilicates in optional caused the solution to handle is the preferred because these compounds contribute to the priming of metal prefabricated actually zero amount of water-soluble salts.

The amount used is not necessarily caused to increase the film strength of the solution is preferably 0.005 to 0.2 l/m2the surface of the primer coating, most preferably of 0.08 l/m2or less, if the coating process and dried in the operating mode on the line in the case of a coating with a dry film thickness of 15-20 μm. The drying time of the coating, treated in this number increases the film strength of the solution is usually from about 5 to 10 min at 15-20°From or from about 1.5 to 2 minutes at 40°C. the drying Time can also be reduced by making the primed base in the air flow.

In General, the drying time can be reduced by increasing the temperature of the Nova, increasing air temperature, air flow, or by any combination thereof.

Optional stacking solution for treatment is preferably applied and dried at a temperature in the range of 10-60°C, preferably 25-50°With forced air flow, preferably in a stream of air at least 0.1 m/s Solution for processing can be applied using standard spray equipment for airless spray or high-volume spray at low pressure, or by using atomized spray through the easy installation of the second dispenser further along the line of the primer metal semi-finished product after spray gun for applying primer. Alternatively the solution may be applied using the technology of aerosol deposition. The solution treatment can be applied on both sides of the base, for example on both sides of the steel sheet for use in shipbuilding, regardless of the orientation of the base; the volume of solution required to increase the strength of the film is such that the solution can be deposited on the underside of the leaf without draining or scapania. Other methods of application, such as application roller, it is also possible, but not preferred. Processed primer coating should only be allowed to dry on osnovi there is no need for any subsequent washing or heating; once processed, the primer dries, with the covered product, you can work in the usual way.

It is established that additional stage use increases the strength of the film of solution is particularly useful when the primer contains a binder containing particles or Sol of silicon dioxide with an average diameter greater than 10 nm, and even more preferable for the particle Sol of silicon dioxide with an average diameter of more than 16 nm. In particular, good results were obtained, after treatment with a solution that increases the strength of the film covered the basis immersed in water or stand in an atmosphere with a relative humidity of at least 80%.

The method of the present invention increases the hardness, cohesion and abrasion resistance of the primer metal semi-finished product without making such drawback as the formation of bubbles when applying the top coating. Furthermore, the method accelerates the manifestation of the (development) of these positive characteristics. This manifestation can be even faster when treated with a solution that increases the strength of the film. Accelerated manifestation of such properties improves resistance to damage during processing and Assembly in shipbuilding or steel mills. In addition to these positive effects primed basis has the characteristics required in the market of metal primers is a semi-finished product, namely, corrosion resistance 6 months when exposed to open air, the beautiful characteristics of the welding/cutting and the ability to application of the top coating using a wide range of primer coating without the formation of bubbles or notevoli.

On the primed base may be coated on the base utverzhdenii an amine epoxy resin or any other coating for severe operating conditions, such as a polyurethane coating, the film thickness of 100 to 200 μm, and after keeping for curing for 7 days basis may be immersed in pure and sea water for 6 months (the longest period tested to date) at 40°without the formation of bubbles.

The invention is also explained using the following examples. The examples are intended to illustrate the invention and are in no way intended to limit its scope.

Determination of the particle size of the colloidal solution of silicon dioxide used in the examples, carry out titration method, which is described in the publication G.W. Sears, Anal. Chem., 12, 1981 (1956). Using this method can be defined as the specific surface area in square meters per gram. For spherical particles Zola surface area is transferred to the particle size.

Used in these examples, the source compounds have the following origin:

Ludox®SM Sol of silicon dioxide with a concentration of 30 wt.%, the average particle size of 7 nm, the molar ratio of SiO2/Na2O 50:1, DuPont, pH of 10.3

Ludox®HS-40 colloidal solution of silicon dioxide with a concentration of 40 wt.%, the particle size of 12 nm, the molar ratio of SiO2/Na2O 95:1, DuPont, pH 9,8

Bindzil®40/170 Sol of silicon dioxide with a concentration of 40 wt.%, the average particle size of 20 nm, the molar ratio of SiO2/Na2O 160:1, Akzo Nobel (Eka Chemicals), pH 9,4

Bindzil®25AT/360 modified alumina Sol of silicon dioxide with a concentration of 25.5 wt.%, of 0.44 wt.% aluminum oxide, average particle size 7 nm, the molar ratio of SiO2/Na2O 50:1, Akzo Nobel (Eka Chemicals), pH 10

Nyacol colloidal solution of silicon dioxide with a concentration of 40 wt.%, the average particle size 16 nm, the molar ratio of SiO2/Na2O 105:1, Akzo Nobel (Eka Chemicals), pH of 9.8

XZ 94770 organic styrene/butadiene latex with 50% vol. solids, Dow Chemicals

Huber 90 calcined aluminosilicate pigment filler with an average particle size of 0.7 μm, JM Huber/Marlow Chemicals

Satintone®W calcined aluminosilicate pigment filler with an average particle size of 1.4 μm, Lawrence Industries

Zinc palatalise powder with an average particle size of 7 μm. Trident Alloys

Molywhite 212 mixed molybdate calcium and zinc, anti-corrosive pigment with a particle size of 4.1 μm, Sherwin Williams

Minex 20 sodium potassium aluminosilicate pigment filler with an average particle size 2,95 μm, North Cape Minerals

Bentone EW thixotropic silicate of sodium-magnesium, Elementis.

Example 1

To assess the effect of drying conditions on the properties of hardened primer metal semi-finished product of the following ingredients is prepared covering the composition with a concentration of solids 28 vol.%. Primer coating has a volume concentration of pigment 71,0%, which is 1.4 times higher than the critical volume concentration of pigment.

Componentwt.%
The Sol of silica Ludox SM30,6
Water13,5
Bentonite thixotropic clay0,2
Zinc dust48,2
Huber 90C7,5

The primer is prepared by mixing a Sol of silicon dioxide with water and a thixotropic agent and the resulting binder is mixed with pigments before applying to the steel, as it usually takes place in the case conciliate coatings. The obtained primer coating applied to the steel panel size 15 cm × 10 cm with a dry film thickness of 15-20 μm at 35°C and relative humidity of 30%. Once the coating is dry to the disappearance of stickiness with a weak touch of a finger, the primed basis incubated at p is slichnih conditions of relative humidity.

1 day after the priming measure the abrasion resistance of coated panels (test double wear). In the test double abrasion test surface is moistened with two drops of water (in a double case of wet abrasion), then RUB the cotton-wool swab with a little pressure. One pass back and forth is a dual abrasion. The results are expressed as the number of dual abrasion to remove the coating. If the coating withstands 100 dual abrasion, the final dry film thickness (heat) compared to the initial value. If the dry film thickness is reduced by more than 25%, the results are expressed as >100. If the dry film thickness is reduced by less than 25%, the results are expressed as 100. The results are shown in table 1.

Table 1
Example No.Size ZolaRelative humidity, %Wet dual abrasion (DHS), 24 h2
1A112018
1b17 mi4030
1C7 nm6072
1d7 nm80"100
1st7 nm100"100
1Comparative example

2Measurement of the wet dual abrasion spend 24 hours after application

Example 2

To assess the effect of drying conditions on the properties of hardened primer metal semi-finished product of the following ingredients is prepared covering the composition with a concentration of solids 28 vol.%. Primer coating has a volume concentration of pigment 70.0%of that at 1,06 times the critical volume concentration of pigment.

Componentwt.%
The Sol of silica Ludox SM27,6
Zinc41,6
Minex 209,1
Molywhite 2122,2
Bentone EW0,2
Waterof 17.5
XZ947701,8

Primer should be applied on a steel panel size 15 cm × 10 cm with a dry film thickness of 15-20 μm. Each panel is dried at different relative humidity. One panel is dried until the disappearance of stickiness with a weak finger contact at a relative humidity of 40% within 30-60 minutes after coating. Then the panel is shipped is fair in water for 30 minutes Water is removed and then the coating is left to dry dry at a relative humidity of 60%. The abrasion resistance of coated panels (test double wear) determined by 1 h after priming. For the sample immersed in water, and the abrasion resistance is measured after 1 h after immersion. The results are shown in table 2.

Table 2
Example No.Size ZolaRelative humidity, %DHS, 1 h2DHS, 24 h3
2A17 nm201524
2b17 nm353054
2C7 nm504985
2d7 nm6052"100
2nd7 nm8064"100
2f7 nmImmersed in water>100"100
1Comparative example

2Measurement of the wet dual abrasion is carried out through 1 h after the application of or immersion in water
3Measurement of the wet dual abrasion spend 24 hours after the application of or immersion in water

Example 3

Of the following ingredients is prepared covering the composition with a concentration of solids 28 vol.%. Primer coating has a volume concentration of pigment 70.0%of that at 1,06 times the critical volume concentration of pigment.

Componentwt.%
The Sol of silicon dioxide Bindzil 25AT/360 (of 0.44 wt.%A1)32,5
Zinc41,6
Minex 209,1
Molywhite 2122,2
Bent one EW0,2
Water12,6
XZ947701,8

In the same manner as described in example 2, each panel is dried at different relative humidity, and one sample is dipped in water and then leave to dry at a relative humidity of 60%.

Resistance of coated panels (test double wear) is measured after 1 h after priming or immersion in water. The results are shown in table 3.

Table 3
Example No.Size Zola wt.% aluminium oxideRelative humidity, %DHS, 1 h2DHS, 24 h3
3A17 nm0,44202231
3b17 nm0,44352654
3C7 nm0,445063"100
3d7 nm0,446065"100
3rd7 nm0,448078"100
3f7 nm0,44Immersed in water>100"100
1Comparative example

2Measurement of the wet dual abrasion is carried out through 1 h after the application of or immersion in water

3Measurement of the wet dual abrasion spend 24 hours after the application of or immersion in water.

Example 4

Of the following ingredients is prepared covering the composition with a concentration of solids 28 vol.%. Primer coating has a volume concentration of the pigment of 50.0%, which is equal to 0.72 from the critical volume concentration of pigment.

Componentwt.%The Sol of silica Ludox HS-4035,0Zinc42,2Minex 201/7Molywhite 2122,2Bentone EW0,2Waterthe 15.6XZ947703,1

Primer should be applied to steel panels with a size of 15 cm x 10 cm with a dry film thickness of 15-20 μm. Each panel is dried at different relative humidity. One panel is dried until the disappearance of stickiness with a weak finger contact at a relative humidity of 40% within 30-60 min after application. Then the panel is immersed in water for 30 minutes the Water is removed and the coating is then allowed to dry at a relative humidity of 60%.

The abrasion resistance of coated panels (test double wear) is determined after 1 day after application of the primer or immersion in water. The results are shown in table 4.

Table 4
Example No.Size ZolaRelative humidity, %Wet dual abrasion (DHS), 24 h2
4A112 nm2024
4b1/td> 12 nm3558
4C12 nm50"100
4d12 nm60"100
4th12 nm80"100
4f12 nmimmersed in water"100
1Comparative example

2Measurement of the wet dual abrasion spend 24 hours after the application of or immersion in water

Example 5

In the same way as in example 4 to prepare a few of coated panels using as a binder Sol Nyacol silica (average particle size 16 nm). As in example 4, each panel is dried at different relative humidity, one sample is dipped in water and then leave to dry at a relative humidity of 60%.

The abrasion resistance of coated panels (test double wear) is determined after 1 day after application of the primer or immersion in water. The results are shown in table 5.

Table 5
Example No.Size ZolaRelative humidity, %Wet dual abrasion (DHS), 24 h 2
5A116 nm2031
5b116 nm3587
5C16 nm50"100
5d16 nm60"100
5th16 nm80"100
5f16 nmimmersed in water"100
1Comparative example

2Measurement of the wet dual abrasion spend 24 hours after the application of or immersion in water.

Example 6

In the same way as in example 1 to prepare a few covered panels. After coating the panel process as follows:

one panel is allowed to stand for 1 h at a relative humidity of 35%;

one panel is allowed to stand for 1 h at a relative humidity of 60% and then immersed in water;

- one panel before immersion process increases the strength of the film with a solution containing TEOS.

The results are shown below in table 6.

Example 7

In the same way as in example 6, cook a few of coated panels using as a binder Zola silica Ludox HS-40 (average particle size 12 nm). After on the Eseniya cover panel process as follows:

one panel is allowed to stand for 1 h at a relative humidity of 35%;

one panel is allowed to stand for 1 h at a relative humidity of 60% and then immersed in water;

- one panel before immersion process increases the strength of the film with a solution containing TEOS.

The results are shown below in table 6.

Example 8

In the same way as in example 6, cook a few of coated panels using a binder containing a colloidal solution of silicon dioxide Bindzil 40/170 (average particle size 20 nm). After coating the panel process as follows:

one panel is allowed to stand for 1 h at a relative humidity of 35%;

one panel is allowed to stand for 1 h at a relative humidity of 60% and then immersed in water;

- one panel before immersion process increases the strength of the film with a solution containing TEOS.

The results are shown below in table 6.

Table 6
Example No.The particle size of the Sol of silicon dioxide (nm)ProcessingWet dual abrasion (dry)
6A*7Keeping 60 min at OB 35%29
6b7Immersion in water for 30 min≫100
6s7Treatment with 5% solution of TEOS, immersion in water for 30 min≫100
7a*12Keeping 60 min at 0V 35%35
7b12Immersion in water at 60 min80-100
7C12Treatment with 5% solution of TEOS, immersion in water at 60 min"100
8A*20Keeping 60 min at 0V 35%6
8b20Immersion in water at 60 min10
8s20Treatment with 5% solution of TEOS, immersion in water at 60 min"100
*) Comparative example

Example 9

Of the following ingredients is prepared primer coating with a concentration of solids 28 vol.%. Primer coating has a volume concentration of pigment 74,6%, which is 1.3 from the critical volume concentration of pigment (λ=1,3).

Componentwt.%
Ludox® SM27,3
Water15,7
Bentonite thixotropic clay0,2
Innova dust 48,2
Satintone8,6

The primer is prepared by mixing a Sol of silicon dioxide with water and a thixotropic agent, and the resulting binder is mixed with pigments before applying to the steel, which is usually the case conciliate coatings. The resulting primer is applied on a steel panel size 15 cm × 10 cm with a dry film thickness of 15-20 μm. The primer is allowed to dry at 25°and 0V 75% and measure the physical properties after 10 min and after 1 day after application. The results are shown in table 7.

Example 10

Of the following ingredients is prepared primer coating with a concentration of solids 28 vol.%. Primer coating has a volume concentration of pigment 74,6%, which is 1.3 from the critical volume concentration of pigment (λ=1,3).

Componentwt.%
Ludox® SM22,0
XZ 947701,5
Water19,1
Bentonite thixotropic clay0,2
Zinc dust48,6
Satintone8,6

The primer is prepared by mixing a Sol of silicon dioxide with water and a thixotropic agent, and a binder obtained vasectomised with pigments before applying to the steel, what usually takes place in the case conciliate coatings. The resulting primer is applied on a steel panel size 15 cm × 10 cm with a dry film thickness of 15-20 μm. The primer is allowed to dry at 25°and RH 75% and measure the physical properties after 10 min and after 1 day after application. The results are shown in table 7.

Example 11

Of the following ingredients is prepared primer coating with a concentration of solids 28 vol.%. Primer coating has a volume concentration of pigment 68,4%to 1.15 from the critical volume concentration of pigment (λ=1,15).

Componentwt.%
Ludox® SM27,6
XZ 947701,8
Water15,1
Bentonite thixotropic clay0,2
Zinc dust48,9
Satintone6,4

The primer is prepared by mixing a Sol of silicon dioxide with water and a thixotropic agent, and the resulting binder is mixed with pigments before applying to the steel, which is usually the case conciliate coatings. The resulting primer is applied on a steel panel size 15 cm × 10 cm with a dry film thickness of 15-20 μm. The primer give wyson is th at 25° C and RH 75%, and measure physical properties after 10 min and after 1 day after application. The results are shown in table 7.

Example 12

Of the following ingredients is prepared primer coating with a concentration of solids 28 vol.%. Primer coating has a volume concentration of pigment 71,5%, which is 1.4 from the critical volume concentration of pigment (λ=1,4).

Componentwt.%
Ludox® SM24,7
XZ 947701,6
Water17,2
Bentonite thixotropic clay0,2
Zinc dust48,7
Huber 90C7,6

The primer is prepared by mixing a Sol of silicon dioxide with water and a thixotropic agent, and the resulting binder is mixed with pigments before applying to the steel, which is usually the case conciliate coatings. The resulting primer is applied on a steel panel size 15 cm × 10 cm with a dry film thickness of 15-20 μm. The primer is allowed to dry at 25°and RH 75%, and measure physical properties after 10 min and after 1 day after application. The results are shown in table 7.

Example 13

Of the following ingredients is prepared a primer on the freight with a concentration of solids 28 vol.%. Primer coating has a volume concentration of pigment 71,5%, which is 1.4 from the critical volume concentration of pigment (λ=1,4).

Componentwt.%
Ludox® SM20,7
XZ 947701,3
Waterto 19.9
Bentonite thixotropic clay0,2
Zinc dust48,3
Huber 90C6,1
Molybdate dye "Molywhite"3/5

The primer is prepared by mixing a Sol of silicon dioxide with water and a thixotropic agent, and the resulting binder is mixed with pigments before applying to the steel, which is usually the case conciliate coatings. The resulting primer is applied on a steel panel size 15 cm × 10 cm with a dry film thickness of 15-20 μm. The primer is allowed to dry at 25°and RH 75%, and measure physical properties after 10 min and after 1 day after application. The results are shown in table 7.

Table 7
Example No.Mechanical properties after 10 min of applicationMechanical the properties after 1 day after application
Dual abrasion dry/wetThe pencil hardness scaleAdhesion by the method of cross-hatch testDual abrasion dry/wetThe pencil hardness scaleAdhesion by the method of cross-hatch test
9>100/12TM-≫100/≫1003T1
10≫100/122T3≫100/≫1006T4-5
11≫100/172T1-2≫100/≫1004-6T3-4
12≫100/212T3≫100/≫1006T2-4
13>100/62-3T3≫100/≫1002-3T3

In table 7 the results show that the coatings with good properties can be obtained by using a wide range of coatings formulations.

Examples 14 and 15

Of the following ingredients two primer coating with a concentration of solids 28 vol.% using a mixture of sols. Both primer coating having the t volume concentration of the pigment is 50%, what is 0,72 from the critical volume concentration of pigment.

Primer coating used in example 14, is prepared from the following ingredients, receiving coating with an average particle size of Zola 10 nm.

Componentwt.%
Ludox® SM (7 nm)5,5
Ludox® HS-40 (12 nm)29,6
XZ 947703,1
Water15/5
Bentone EW0,2
Zinc42,2
Molywhite 2122,2
Minex 201,7

Primer coating used in example 15, is prepared from the following ingredients, receiving coating with an average particle size of Zola 10 nm.

Componentwt.%
Ludox® SM (7 nm)6,8
Nyacol (16 nm)30,0
XZ 947703,1
Water13,9
Bentone EW0,2
Zinc42,1
Molywhite 2122,2
Minex 201,7

The obtained primer is applied on a steel panel size 15 cm × 10 cm the dry film thickness of 15-20 μm and dried at 35° With and 0V 75%. Within 1 h primed bases maintained at RH 60%. Then measure the physical properties of the coatings after 1 h and 1 day after application. The results are shown in table 8.

Table 8
Example No.The particle size of the colloidal solution in a mixtureMechanical properties after 1 hour after applicationMechanical properties after 24 hours after application
Wet dual abrasionThe pencil hardness scaleWet dual abrasionThe pencil hardness scale
147 nm/12 nm42TM"100T
157 nm/16 nm28TM"100T

In table 8 the results show that the good properties of the coating can be achieved using a mixture of sols.

1. The method of application on steel base primer coating containing a binder on the basis of silicon dioxide, characterized in that the binder comprises an aqueous Sol of silicon dioxide, having a molar ratio of SiO2/M2O, where M made the focus of all ions of the alkali metal and ammonium in an amount at least 25:1, and the fact that after drying of the primer coating to the disappearance of stickiness with a weak touch of a finger covered with a basis immerse in water or other solution is kept in an atmosphere with a relative humidity of at least 50%.

2. The method according to claim 1, characterized in that the binder comprises an aqueous Sol of silicon dioxide, stabilized alkali metal ions.

3. The method according to claim 1 or 2, characterized in that the primer coating contains almost no water Zola silicon dioxide, stabilized ammonium ions.

4. The method according to claim 1, characterized in that the coated base is kept in an atmosphere with a relative humidity of at least 60%.

5. The method according to claim 1, characterized in that the coated base is kept in an atmosphere with a relative humidity of at least 80%.

6. The method of application on steel base primer coating containing a binder on the basis of silicon dioxide, characterized in that the binder comprises an aqueous Sol of silicon dioxide, having a molar ratio of SiO2/M2O, where M represents all the ions of the alkali metal and ammonium in an amount of at least 25:1, and the fact that after drying of the primer coating to the disappearance of stickiness with a weak touch of a finger covered with a basis before pogruzheny the m in water or by keeping in an atmosphere with relative humidity, at least 80%, is treated with a solution that increases the strength of the film.

7. The method according to claim 6, characterized in that increasing the strength of the film solution contains zinc sulfate or aluminum sulfate.

8. The method according to claim 6 or 7, characterized in that increasing the strength of the film solution is applied from the calculation of 0.005-0.2 l per square meter of surface coated with a primer coating.

9. The method according to any one of claims 1 to 8, characterized in that the binder contains particles of colloidal silica with an average particle size of less than or equal to 22 nm.

10. The method according to claim 9, characterized in that the binder contains particles of colloidal silica with an average particle size of less than or equal to 16 nm.

11. The method according to claim 10, characterized in that the binder contains particles of colloidal silica with an average particle size of less than or equal to 10 nm.

12. The method according to any one of claims 1 to 11, characterized in that the binder is a colloidal solution of silicon dioxide with a molar ratio of SiO2/M2O at least 25:1.

13. The method according to any one of claims 1 to 12, characterized in that the primer coating further comprises zinc powder and/or a zinc alloy.

14. The method according to any one of claims 1 to 13, characterized in that the primer coating further comprises an organic resin.

15. Ways is according to any one of claims 1 to 14, characterized in that all the components of the coating composition is added and thoroughly mixed just prior to application.

16. The method according to any one of claims 1 to 15, characterized in that the binder contains an aqueous Sol of silicon dioxide with a surface-modified aluminum oxide.



 

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Steel undercoat // 2275970

FIELD: processes adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials, namely for steel covering.

SUBSTANCE: method involves applying undercoat including binding agent on steel substrate; drying thereof up to termination of user's finger sticking to the coated steel surface; immersing the coated surface in water or exposing thereof to atmospheric air having humidity of at least 50%. The binding agent is aqueous silicon dioxide sol having SiO2/M2O mol ratio of at least 25:1, wherein M is summary alkali metal and ammonium ions. In accordance with the second embodiment the coated steel substrate before substrate submersion in water or exposing to humidified air is treated with solution, which increases coating film strength, over at least 80% of steel substrate area.

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FIELD: protective coatings.

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1 tbl

FIELD: metallurgy industry; metal-rolling production; methods of application of the paint-and-lacquer coating on the metallic strips.

SUBSTANCE: the invention is pertaining to the metal rolling production and may be used in the sheet-rolling shops coating branches incorporating the aggregates of the polymeric coatings of the roll flat stock. The method of application of the paint-and-lacquer coating on the surface pf the metallic strip includes, at least, entrapment of the liquid paint-and-lacquer material by the catching roll rotating in the underpan with the enamel, transfer of the enamel layer from the catching roll onto the applying roll and the being stained surface of the strip, the continuous feeding of the liquid paint-and-lacquer material into the underpan. The distinctive feature of the method is the preliminary "settling", separation from the air bubbles, the foam bunches of the new fed batches of the paint-and-lacquer materials directly in the paint-and lacquer underpan without usage of the special containers. Entrapment of the new batch of the liquid paint-and-lacquer material by the catching roll is exercised from the special area of the liquid paint-and-lacquer material underpan - the entrapment area insulated from the foam infiltration in it. The liquid paint-and-lacquer material is fed into the entrapment area from the settling area with the subsequent its application on the surface of the applying roll and further - on the strip. The technical problem is being solved by the invention with the help of the mounted in the paint-and-lacquer material underpans of the special design baffles allowing to form on the surfaces of the catching and applying rolls and on the steel strips of the stable-continuous film of the liquid paint-and-lacquer material without the air bubbles, the bunches of the foam in its composition; to reduce the amount of the defected metal strips with the paint-and-lacquer coatings.

EFFECT: the invention allows to form on the surfaces of the catching and applying rolls and on the steel strips of the stable-continuous film of the liquid paint-and-lacquer material without the air bubbles, the bunches of the foam in its composition; to reduce the amount of the defected metal strips with the paint-and-lacquer coatings.

1 tab

FIELD: metallurgy.

SUBSTANCE: inventions relates to continuous mode of metal surfaces, particularly it relates to titanium, titanium alloys and aluminium, implemented in the form of foil or cell structure. Method includes mechanical restoration of titanium or titanium alloy for removing of oxides from surface, preparation of sol-helium solution, plating of sol-helium solution with formation of coating on mechanically restored titanium or titanium alloy and application of epoxy adhesive coating on coated sol-helium solution. The second option includes cleaning of titanium, titanium alloy or aluminium, at least, one alkaline cleaner and aqueous degreasing agent, restoration of metallic material, at least, mechanical restorative, conditioning of metallic material by alkaline solution containing 5 - 50% of alkali, application of sol-helium solution on metallic material and plating of epoxy adhesive coating on sol-helium coating.

EFFECT: methods provides increasing of treated material ability to connection with other objects and to create epoxy-compatible adhesive layer on the metal surface.

13 cl, 2 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: polyurea coating composition is obtained from a reaction mixture which contains an isocyanate functional component and an amino functional component, where the ratio of equivalents of isocyanate groups to equivalents of amino groups is greater than 1, volume ratio in the mixture of the isocyanate functional component to the amino functional component is 1:1, in which at least one polyisocyanate monomer constitutes at least 1 wt % of the isocyanate functional component, where the isocyanate functional component contains the reaction product of polyisocyanate and at least two polyols, and the amino component contains an aspartate-based amino functional reactive resin. The multicomponent composite coating contains a first polyurea layer which is deposited from the first composition, and a second polyurea layer which is deposited from the second composition, in which at least one composition, chosen from the first composition and second composition, includes a polyurea coating composition.

EFFECT: obtaining compositions which improve adhesion to earlier deposited coatings or to a substrate, characterised by low viscosity, which improves fluidity of the coating composition for a long period of time.

24 cl, 3 dwg, 1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: method includes preprocessing of metal surface doe receiving on it of hydroxyl groups with its following treatment by organic silicon compound and modification. Preprocessing is implemented by solution of sodium hydroxide. Following treatment is implemented by solution of polymerisation initiator - dichlor (3-chlor propyl)methl silane at presence of scavenger chlorine-hydrogen. Modification is implemented in solution containing hydrophilous monomer by means of its implanted polymerisation on surface at presence of catalystic complex, consisting of metal halogenide of variable valency and organic ligand, during 5-10 h at 50-60°C.

EFFECT: increased hydrophilous and sorption properties.

3 cl, 6 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of preparing a polymer coating on metal surface having hydrophilic and sorption properties which can be used as evaporating plates and for sorbing biopolymers. The method involves pretreatment of the metal surface with 1N aqueous monochloroacetic acid, or 0.5N solution of 3-chloromethylbenzoic acid in methanol, and modification is carried out in a solution containing a hydrophilic monomer through its graft polymerisation on the surface in the presence of a catalyst complex consisting of a metal halide with varying valency and an organic ligand for 4-10 hours at 50-60°C.

EFFECT: obtaining a polymer coating on a metal surface with improved hydrophilic and sorption properties.

3 cl, 6 ex, 1 tbl

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