Coating composition and method of obtaining her base (binder)

 

(57) Abstract:

Describes a coating composition comprising as the active agent powder zinc with a particle size of from 4 to 20 μm, and the binder containing ethyl silicate, ethyl alcohol, polyvinyl butyral, phosphoric acid and water, and the method of preparation of the binders according to the following scheme: in one capacity butyral dissolved in parts of ethanol, in a separate bowl mix phosphoric acid and water with the remaining amounts of ethanol, after which the solution from the second container is placed in the first under stirring and enter ethyl silicate. The technical result is to increase the corrosion resistance of the coating (up to 2000 h) and to improve the technological properties of the composition (resilient connecting up to 12 months, and the viability of freshly prepared compositions up to 24 hours). 2 S. and 1 C.p. f-crystals, 6 PL.

The invention relates to paints, varnishes and lacquers, in particular zinc-containing compositions for corrosion-resistant steel. In addition, the invention relates to methods of producing such compositions.

Known anti-corrosion composition comprising 10-90 wt.% zinc powder and the binder, in other "Filled with metal protective coating), niitekhim, 1980, S. 2-6). Ethyl silicate binder is issued by the industry on THE 6-10-1468-79 and contains, by weight. %: ethyl silicate 40 - 12,1; butyral brand LA 6,1; phosphoric acid and 0.3, isopropyl alcohol is 72.1; water - the rest.

Also known composition and the technology of production of zinc-containing anti-corrosive paints KO-42 (Technological regulations LSPU "Pigment" N 70-2-03/85, appr. 19.03.85 year ). In the paint KO-42 includes: zinc powder brands PC-PC with the following granulometric composition, %: fraction of 4-10 μm - 30; fraction 10-20 μm - 10; fraction of more than 20 μm - 60; and ethyl silicate binder (base paint), of the following composition, wt.%: ethyl silicate-32 - 12,1; butyral - 6,1; phosphoric acid (73%) - 0.3; the ethyl alcohol is 72.1; water - 9,4.

A method of obtaining a binding is one-step mixing of all components in the reactor.

The high content of zinc in the powder particles larger than 20 μm - 60% increases the degree of heterogeneity of the composition and as a consequence causes uneven coating. This is due to the following factors:

accelerated sedimentation of large particles in the mixture of powder and paint (binder) leads to Ingenio content of zinc in the coating;

- due to the high fraction of large particles decreases the density packaging of zinc particles in the coating;

- increases the degree of heterogeneity of the coating ratio of the metal powder/Foundation".

Due to spotty coverage on the individual, the most "weak" areas have pockets of corrosion (the so-called "pitting corrosion"). Electroproduction properties of the finished coating are reduced.

Closest to the present invention is a composition for anti-corrosion coatings, including the basis of ethyl silicate binder and a powder of zinc with particle size 1-10 μm in the amount of 10-90 wt.%. Ethyl silicate binder has the following composition, wt.%: ethyl silicate-40 - 12,1; butyral - 6,1; phosphoric acid (73%) - 0.3; the ethyl alcohol is 72.1; water - 9,4.

Known binder is prepared by mixing all components in the reactor with stirrer (patent USSR N 1678036, MKI 5 09 D 183/02, 1997) prototype.

In the case of the predominance of very small particles of powder (60 wt.% particles less than 4 microns) have the following negative factors:

- dramatically increases the viscosity of the composition decreases its viability;

- fine particles easily form agglomerates, resulting in worsening of homogenous, significantly deteriorates the appearance of the coating;

- decrease the initial electrochemical potential in the systems "steel-cinnabarina floor (LTCs)", with the potential of LTC fast approaching potential of steel, and its electrical resistance increases rapidly. Consequently LTCs with a high content of particles less than 4 microns has a lower electroproduction properties.

The mechanism of formation of a protective layer on the steel surface when applying cinnabarinus composition on ethyl silicate basis lies in the interaction at the interface of iron particles of zinc, prisoners of ethyl silicate in the shell, resulting in a durable zinc-iron-silicate layer that is resistant to water and solvents. Continuity and uniformity (homogeneity) of the coating depend on the dispersion of zinc powder, as well as the uniformity and strength of the silicate shell on the particles of zinc, i.e., from the properties of the base - binder.

In the known methods binder is prepared by loading all components in the reactor when mixing. Thus, in the method of obtaining the composition of the prototype in the reactor serially download an aqueous solution of ethics, while 10-15 wt.% the resulting binder is rejected in terms of viscosity (more than 35). The main reason for this low output of nonconforming product is the low stability of the mixture and the tendency to gelation.

The coating obtained by applying the known compositions have insufficient high anticorrosive properties, have poor appearance. The songs have unsatisfactory characteristics - low resilience, low shelf life of the binder and the composition in General. These shortcomings are mainly associated with the known ratio of the main components of the fundamentals of composition (binder). Known binder is a colloidal solution, the introduction in which zinc powder is not possible to achieve the desired homogeneity.

As shown by our research, the colloidal structure of the binder depends on the ratio of main components: the alcohol/water ("a" value) and ethyl silicate/water (value "B"). In the process of obtaining ethyl silicate binder are two main reactions: hydrolysis and condensation. Depending on the values of a and B in the binder is dominated by either the products of hydrolysis, or the product of the action of hydrolysis in the initial stage and the intensification of the condensation reaction. The result is the formation of long polymer chains, the integration of molecules and obtained highly viscous colloidal solution. This binder has a low shelf life, easily turns into a gel, not suitable for use. The shelf life of such binding does not exceed 6-7 months, the resilience of the composition is not more than 8 hours.

An object of the invention is to obtain coatings with high corrosion resistance, and improved technological properties of the composition.

This object is achieved in that the composition contains fine powder of metallic zinc, obtained by gas-phase method by evaporation of zinc and the subsequent condensation of vapors in the atmosphere of a neutral gas, with a particle size less than 4 μm is not more than 15%, particle size of 4-10 microns of not less than 60%, of particles with a size of 10-20 μm is not more than 15% of particles larger than 20 μm is not more than 10%, and ethyl silicate binder consisting of ethanol, ethyl silicate, polyvinyl butyral, water and phosphoric acid in the following ratio of the binder components, wt.%:

Ethyl silicate of $ 11.97-12,16

The butyral - 6,09-6,33

Orthophosphoric acid (73%) - 0,2-0,3

Ethyl alcohol - 73,9-76,5

The unique properties of the inventive anti-corrosion compositions are provided in a certain proportion of the basic structural components of ethyl silicate binder: alcohol/water to 10.5 and 15.3; ethyl silicate/water of 1.7-2.4.

As active principle an anticorrosive composition used superfine zinc powder obtained by the method of evaporation and condensation in the atmosphere of a neutral gas, i.e., the source of metallic zinc is melted when heated, get it steam, which then condenses with obtaining a powder of a specified particle size distribution. The process of evaporation of metallic zinc are in the atmosphere of neutral gas, which is used as the gas medium reacts with the deposited metal and oxygen, for example using any of the known inert gases (helium, neon, argon, and nitrogen and other active gases. Thus obtained zinc powder has certain properties due, in large part, 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, providing a unique plasticity of the zinc powder is nymi properties used zinc powder and the ratio of structural components ethyl silicate binder. The resulting coating composition has elevated protective properties, high adhesion to metal and high weather - resistance.

Granulometric composition and the ratio of superfine zinc powder to the ethyl silicate binder have a significant impact on the stability of the composition and uniformity of coating.

Table. 1 illustrates the increase in uniformity of particle size distribution of the zinc powder in the inventive solution, in comparison with known compounds.

A sharp decline in the share of small particles (less than 4 microns) powder reduces agglomeration increases the consistency and resilience of the composition reduces its viscosity. The decrease in the content of particles larger than 10 microns and a substantial reduction in the fraction larger than 20 microns provide stability ratio metal/base composition.

Corrosion properties of coatings on the basis of the proposed zinc-rich compositions are provided by the creation of a passivating coating on the particles of zinc followed by the formation of the silicate matrix of the connection type silicon-oxygen-metal on each particle of zinc powder. The more regular and uniform, these shells, the fact is which the basis of the composition (binder) to the true solution.

A typical ratio of alcohol/water and ethyl silicate/water in the inventive binding shifts the equilibrium reactions of hydrolysis and condensation, reducing the formation of long polymer chains. The binder solution has a lower viscosity, transparent and has a shelf life for 12 months.

Suggested improvements related to the method of preparation of the binder.

The inventive method of preparing a binder anticorrosive cinnabarinus compositions containing ethyl alcohol, ethyl silicate, water, polyvinyl butyral and phosphoric acid, is that in the same container are dissolved in parts of ethanol polyvinyl butyral, in other capacity is dissolved in the remaining amount of ethyl alcohol phosphoric acid and water, then the solution of the second container is placed in the first container, mix and add ethyl silicate in the following ratio of the binder components, wt.%:

Ethyl silicate of $ 11.97-12,16

The butyral - 6,09-6,33

Orthophosphoric acid (73%) - 0,2-0,3

Ethyl alcohol - 73,9-76,5

Water - the Rest

For dissolving polyvinyl take 75-80% of the total amount of ethanol and dissolving phosphoric K a homogeneous composition, close to the true solution. By mixing the two alcoholic solutions provides high uniformity of distribution of water and phosphoric acid in the whole volume, eliminates the possibility of formation of microvolumes with a high water content, facilitating hydrolysis. When the last stage is injected ethyl silicate, the hydrolysis reaction proceeds uniformly, the result is a clear solution having characteristics close to the true solution. This binder has a retention period of 12 months, and the resilience of the composition reaches 23 hours compared to 6-8 hours of well-known compositions. The output of nonconforming product does not exceed 0.5 to 1.0%.

The claimed coating composition and the method for its Foundation-binders are connected by a single inventive concept, since achieve the same technical result, i.e. the result of a technical problem.

The invention is illustrated by the following examples of specific performance.

The active principle of the composition, which is used superfine zinc powder obtained by gas-phase method by isprerelease particle size distribution: particle size less than 4 μm is not more than 15%, from 4 to 10 μm is not less than 60%, from 10 to 20 less than 15%, from 20 μm to not more than 10% were taken and mixed with pre-obtained binder (base) to obtain a homogeneous suspension.

Binder (the base) is prepared by dissolving polyvinyl butyral in ethanol (75-80% of its total amount) in one tank, the other tank is dissolved in the remaining amount of the alcohol phosphoric acid and water, then pour in first the capacity of the solution from the second vessel, mix and add ethyl silicate. For the preparation of binders using ethyl silicate, ethyl technical and phosphoric acid 73%-aqueous solution in the following ratio, wt.%:

Ethyl silicate of $ 11.97-12,16

The butyral - 6,09-6,33

Orthophosphoric acid (73%) - 0,2-0,3

Ethyl alcohol - 73,9-76,5

Water - the Rest

Anticorrosive processing standard steel sample size HH mm were carried out by pneumatic spraying of the claimed composition on a previously prepared surface. The layer of the applied composition was dried in natural conditions within 20-30 minutes

In tables 2-5 experimental data.

Table. 2A, table. 2B and tawnie physico-chemical and technical characteristics (viscosity, optical density, viability) of the binder and composition.

Change in the proportion of alcohol/water (a) and ethyl silicate/water (B) in the binder (PL. 2A) allows to reduce the viscosity of the binder, to increase its shelf life with 6-7 months (prototype) up to 12 months and more than three times to increase the resilience of the composition (from 6 to 23 hours). This means that the composition can be prepared not each shift and once per day, which gives significant savings in production costs.

Even more the advantage of the proposed solutions when comparing the results of 12 months after preparation of the binder. A binder obtained by a known method, turned into a gel and became unusable, whereas binding to the claimed solution was maintained the required technological properties, and composition based on it has a sufficiently high resilience - up to 12 hours.

According to the data table. 3, the proposed method for the preparation of the binder enhances the release of conforming product and the resilience of the binder and composition even in the preparation of the binder composition, the corresponding prototype.

Bring the alleged invention reaches 2000 hours under conditions of salt mist chamber, whereas in the known solutions, it does not exceed 800 hours. In conditions of tropical climate offer coating withstands greater than 95 cycles without corrosion damages, and known coating is not more than 80 cycles.

The proposed ratio of the binder components provides high adhesion of the coating to the steel table. 5), which is necessary to prevent subsurface corrosion. As the data reveal, for the values of And in excess of 15.3, and B, more than 2.4, the adhesion is poor (more than 1 point). The reason is the decrease in film-forming ability of the composition. Due to the predominance of the processes of hydrolysis and the inherent processes of condensation in binding are not formed sols polysilicon acid, well adsorbiruyuschee on the surface of the steel and causing the magnitude of adhesion.

Thus, changing the ratio of components basics-connecting to the reduction of the amount of water and increase the proportion of alcohol in combination with an optimum particle size of the powder of zinc, the improvement of the method of preparation of the binder, consisting of separate dissolved components in ethanol and then mixing the obtained soicety coverage and improving the processing characteristics of the binder and composition. The use of our invention provides improved corrosion resistance of cinnabarinus coverage up to 2,000 hours under conditions of salt mist chamber, the resilience of the binder with 8 to 12 months and viability of the songs up to 24 hours.

1. Coating composition containing as active principle a powder of metallic zinc in an amount of 10 to 90 wt.% and the rest - framework-binder containing ethyl silicate, ethyl alcohol, polyvinyl butyral, phosphoric acid and water, characterized in that the metal powder zinc composition contains fine powder of zinc obtained gas-phase method by evaporation of metallic zinc with subsequent condensation of vapor in the atmosphere of a neutral gas, with a particle size less than 4 μm is not more than 15% of particles with a size of 4 to 10 μm is not less than 60%, particle size of 10 to 20 μm is not more than 15% of particles larger than 20 μm is not more than 10%, and binder-base contains ingredients when following their ratio, wt.%:

Ethyl silicate of $ 11.97 - 12,16

The butyral - 6,09 - 6,33

Orthophosphoric acid (73%) - 0,2 - 0,3

Ethyl alcohol - 73,9 - 76,5

Water - the Rest

2. Method of preparation of a binder for Horney acid, ethyl alcohol and water, characterized in that in one capacity butyral dissolved in parts of ethanol, in a separate bowl mix phosphoric acid and water with the remaining amounts of ethanol, after which the solution from the second container is placed in the first container while stirring and introducing ethyl silicate in the following ratio, wt.%:

Ethyl silicate of $ 11.97 - 12,16

The butyral - 6,09 - 6,33

Orthophosphoric acid (73%) - 0,2 - 0,3

Ethyl alcohol - 73,9 - 76,5

Water - the Rest

3. The method according to p. 2, characterized in that the dissolving polyvinyl take ethanol in the amount of 75 to 80 wt.% from his total.

 

Same patents:

The invention relates to a method of anticorrosive treatment of metal structures by applying to the surface of the corrosion-resistant metal coating and can be used, for example, to process supports the air lines, open distribution devices of high-voltage substations, guardrails, load-bearing structures of industrial buildings and structures, fixtures and other products

The invention relates to coatings for operation in the marine and fresh water, and can be used in engineering, neftedobychi metallurgy

The invention relates to techniques for protection against corrosion (rusting of ferrous metals, such as metal roofing, pipes, etc

The invention relates to the field of materials science, corrosion and heat-resistant coatings and can be used in various industries for steel structures, components and parts operated at temperatures up to 500aboutWith inclusive

The invention relates to paints, varnishes and lacquers, and in particular to compositions for corrosion and heat-resistant coating articles of iron and steel, operated at elevated temperatures
The invention relates to an antistatic transparent compositions for coating the external surfaces of the screens of the cathode ray tube (CRT) to prevent glare and electrostatic charges, to methods of producing these compounds, and to methods for producing video displays with anti-static coating

FIELD: production of protective coat on carbon-carbon composite materials.

SUBSTANCE: claimed method includes surface pretreatment with boric acid aqueous suspension in volume ratio of 1:1 drying and composition coating. Wherein said composition contains borosilicate glass powder and binder comprising of 40-45 vol.% ethyl silicate, 40-45 vol.% ethyl alcohol and 10-20 vol.% silicone varnish. Composition is coated in form of 3-6 layers and further dried at 100-200°C.

EFFECT: improves coating composition for carbon-carbon materials.

1 ex

FIELD: electricity.

SUBSTANCE: enamel includes semi-finished product of enamel that represents pigment suspension in a mixture of synthetic resins, acid catalyst silicone lacquer KO-945 organic high-temperature solvent propylene carbonate. Enamel for colour marking of radio parts provides marking of high quality, eliminates such defects as colour strip unevenness by width, strip duality and missing colour, filiform gaps, drying cracks and ragged edges of the strip, insufficient brightness, fusion of two strips.

EFFECT: improvement of radio parts marking quality results in increase of serviceable products output.

1 tbl

FIELD: chemistry.

SUBSTANCE: disclosed is a method of modifying physical properties of a base selected from zeolites, synthetic and natural silicates, silicon oxides, aluminium oxides and minerals, involving coating the base with nanostructured chemicals selected from polyhedral oligomeric silsesquioxanes of formula [(RSiO1.5)n(RXSiO1.0)m]Σ#, where m, n and # denote an integer from 1 to 10, R is a linear aliphatic hydrocarbon and X=OH. The nanostructured chemical modifies a physical property of the base, selected from a group comprising (a) low moisture absorption by the base, and (b) high compatibility with polymers, when the said base is used as filler material.

EFFECT: possibility of obtaining coatings with improved hydrophobic property, heat resistance, strength and longevity.

11 cl, 7 dwg, 3 tbl, 1 ex

Laminate // 2428315

FIELD: process engineering.

SUBSTANCE: invention relates to laminate used in glass panels, lenses etc. Proposed laminate comprises base made up of polycarbonate resin, first layer resulted from hardening acrylic resin hardening, second layer produced by thermal hardening of organosiloxane resin. Acrylic resin composition comprises (A) acrylic copolymer containing at least 70 mol % of repeating link of formula (A)

,

where X is hydrogen or methyl, Y is methyl, ethyl, cycloalkyl or hydroxyalkyl with the number of atoms of 2 to 5, or residue of UV radiation absorber based on triazine; blocked polyisocyanate compound; hardening catalyst; and (D) UV radiation absorber based on triazine. Note here that total content of UV radiation absorber based on triazine in formula (A) and as component (D) varies from 1 to 40 wt %. Composition of organosiloxane resin in proposed laminate comprises (E) colloidal silicon dioxide and (F) hydrolytic condensate of alkoxy silane. Invention covers also window glass made based on said laminate.

EFFECT: higher strength and longer life.

25 cl, 15 tbl, 50 ex

FIELD: chemistry.

SUBSTANCE: method involves formation of a coating composition on a substrate before exposure to the environment, said composition containing (i) a curable polyorganosiloxane polyoxyalkylene block copolymer, having at least two reactive groups X located on the silicon atom of the polyorganosiloxane polyoxyalkylene block copolymer chain and (ii) an organosilicon cross-linking agent and/or a catalyst.

EFFECT: obtaining a water-insoluble hydrophilic coating and reducing fouling thereof.

15 cl, 26 ex

Coating composition // 2481368

FIELD: chemistry.

SUBSTANCE: invention relates to a coating composition, a coating which contains such a composition, an article and a method of coating a substrate. The coating composition contains a copolymer obtained from a reaction mixture containing: ethylenically unsaturated hydrolysable silane, ethylenically unsaturated polyoxyalkylene, ethylenically unsaturated fluorinated polyether, an initiator and a chain-transfer agent. The coating contains a curable sol-gel dispersion and a coating composition. The article has a substrate and a cured coating on at least one surface of the substrate, where the cured coating is a curable composition which contains a curable sol-gel dispersion and a coating composition. The method of coating the substrate comprises steps of: providing a substrate, providing a curable coating composition which contains a curable sol-gel dispersion and a coating composition, applying a coating from the curable coating composition on at least part of the substrate and curing the coating.

EFFECT: obtaining a coated substrate which provides low surface energy to make cleaning easier, having low degree of picking up cleaning waste.

26 cl, 12 tbl, 50 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a composition for coating foam plastic particles and making articles therefrom. The coating composition contains a clay mineral, an alkali metal silicate and a product of emulsion polymerisation of ethylenically unsaturated monomers as a film-forming polymer. The clay mineral is selected from a group which includes allophane, kaolinite, halloysite, montmorillonite, vermiculite or mixture thereof. The product of emulsion polymerisation of ethylenically unsaturated monomers is selected from a group which includes styrene, butadiene, acrylic acid, methacrylic acid, alkyl acrylates, alkyl methacrylates, an amide of acrylic acid, an amide of methacrylic acid and an amide of methylol acrylic acid. In order to make foam plastic moulded articles, foam plastic particles are sintered in a press mould.

EFFECT: using the composition to coat foam plastic particles prevents embrittlement of foam plastic moulded articles, which maintain structural integrity even at temperatures higher than 800°C.

12 cl, 3 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to water, based on metal oxide, polymeric hybrid carrier-systems. Hybrid film-forming composition is obtained by formation of water mixture, which contains organofunctional silane, metal chloride, acid, boiling of mixture, adding base to claimed mixture for mixture neutralisation and formation of metal hydroxide, obtaining colloidal suspension, which includes metal hydroxide and siloxy-compound, addition of peroxide-based solution for formation of suspension, which contains metal peroxide, ensuring balance of suspension at room temperature and boiling suspension at pressure higher than atmosphere pressure with formation of coating composition, which contains product of siloxy-compound and metal peroxide condensation.

EFFECT: invention ensures obtaining hydrophobic or hydrophilic coatings.

34 cl, 2 ex, 6 dwg

FIELD: manufacturing technology.

SUBSTANCE: invention relates to coating for polymer insulating material and method for production thereof. Such coatings can be applied both on three-dimensional parts, and on sheet materials such as films and woven materials. Coating contains from 1 to 10 layers and is silica, wherein coating contains main silicate structural unit with organic residues, due to which it can be applied on flexible substrates. Thickness of individual layer in coating varies from 0.1 to 100 mcm, individual layers are obtained by wet chemical method from precursors, which are silane, siloxane and/or silicate, wherein organic residues content inside coating varies from layer to layer, so that inorganic fragments content of Si-0 inside coating increases to outside, i.e. according to distance from substrate.

EFFECT: technical result consists in obtaining coatings with improved resistance to corona discharge.

8 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to coating compositions containing metal powders, and can be used in machine building for protecting metal surfaces, operating at high temperatures in conditions of abrasive wear in corrosion medium. Described is a composition for wear-resistant anti-corrosion coating, containing an organosilicon component and an aluminium-based component, wherein organosilicon binder used is a binding agent – silicone lacquer KO-85, aluminium-based component is aluminium powder, wherein composition additionally contains zinc powder and aerosil in following ratio, vol%: silicone lacquer KO-85 55–70, zinc powder 7.5–11.25, aluminium powder 7.5–11.25, aerosil 15-22.5.

EFFECT: obtaining a coating composition with high resistance to wear with simultaneous exposure to aggressive corrosive media of abrasive substances and cyclic impact loads.

1 cl, 1 tbl

Coating composition // 2245893

FIELD: chemistry, in particular coating compositions, dyes and colorings.

SUBSTANCE: claimed composition includes resin with curing agent in combination with metal powder and stabilizing additive. More particular composition contains polyester resin or epoxy resin, 40-80 mass % of aluminum, iron, bronze, brass or copper powder with particle size of 25-250 mum, and as stabilizing additives at most 5 mass % of feltproofing additive and at most 20 mass % of thixotropic additive. Composition has high storage stability and useful for coating of any geometry surface.

EFFECT: coatings of high heat conductivity and thickness applicable for mechanical operation.

1 tbl

FIELD: corrosion protection.

SUBSTANCE: protective ground paint for painting coiled metal and electrochemical protection of bridges, power lines, and other long term-use metallic structures contains, wt %: epoxide resin 9.0-29.0, polyamide resin 3.0-9.5, pigment 23.0-36.0, zinc nanoparticle preparation 3.0-5.0, filler 13.0-23.2, and solvent - the balance. Zinc nanoparticle preparation is introduced in the form of (0.4-4)x·10-3 M solution in isooctane.

EFFECT: enhanced protective properties.

2 tbl, 4 ex

FIELD: protective materials.

SUBSTANCE: invention relates to a method for preparing priming coat for steel that is designated for assembly and applying upper coat. Steel in grounded with priming coat comprising a silicon dioxide-base binding substance containing silicon dioxide aqueous sol stabilized with aluminum oxide and, optionally, small amount of alkaline metal silicate. Indicated binding agent shows the mole ratio SiO2/M2O = at least 6:1 wherein M means the total amount of alkaline metal ions and ammonium ions. After drying the priming coat up to disappearance of stickiness in weal touch by a finger it is treated optionally with a solution that enhances the strength of the priming coat film.

EFFECT: improved and valuable properties of coat.

12 cl, 7 tbl, 21 ex

Up!