Anticorrosion coating composition

FIELD: chemistry.

SUBSTANCE: anticorrosion coating composition which can be used for protecting steel structures, objects and equipment from corrosion in atmospheric conditions and aqueous media, contains finely dispersed zinc powder, polystyrene and/or a copolymer of styrene with rubber, organic solvent and a rheological additive, and additionally a binder in form of a polyisocyanate prepolymer - aromatic polyisocyanate prepolymer based on diphenylmethanediisocyanate and moisture-absorbing additives. The finely dispersed zinc powder is obtained through physical vapour deposition. The moisture-absorbing additive used is tosylisocyanate and/or micronised highly porous crystalline aluminium silicat. The rheological additive used is bentonite or montmorillonite. The organic solvent used is a solvent of oil or xylene or butylacetate or methoxypropylacetate or white spirit or mixture thereof.

EFFECT: improved physical and mechanical and protective properties of the coating based on the composition, reduced presence of defects in the coating, reduced consumption of the composition, with preservation of protective properties, increased stability during storage and longer storage life.

8 cl, 4 tbl

 

The invention relates to an anticorrosive paint materials containing zinc powder, and can be used for corrosion protection of steel structures, products and equipment in atmospheric conditions and water environments.

Currently, the technique is quite widely known methods of anticorrosion treatment of metal construction and equipment, which consists in applying to the pre-prepared surface of the anticorrosive coatings formed from highly zinc-containing compositions on organorazbavlyaemym binder.

Known zinc-containing composition for corrosion protection of building structures and equipment, including thermoplastic resin, the waste polyvinyl chloride or Acrylonitrile-the best choice plastic (7,0 to 15.6)%; zinc powder brand PC-2 or PC-3 (31,2-61,4)%; epoxy Dianova resin (1,8-3,0%; amine hardener type (1,8-3,0)%; 5-aminosalicylic acid (0,15-0,30)% and organic solvent (27,7-47,05)% (USSR Author's certificate No. 1657518, C09D 127/06, 5/10, 1991 g).

The known arrangement has the following disadvantages:

- the use of zinc, which is coordinating unsaturated metal in the compositions and coatings based on polyvinyl chloride, leads to the dehydrochlorination of the latest and allocation of Hcl, causing corros the Yu metal;

the use of polyvinyl chloride is often undesirable from the point of view of the environment due to its toxicity, which manifests as in the preparation of this composition and operation of coatings based on it: MAC polyvinyl chloride in the air of working zone 6 mg/m3; upon contact of the coating with water it will jump polyvinyl chloride; when ignited, the coating will form dioxins.

The coating on the basis of known composition does not provide sacrificial (cathodic) protection of steel, resulting in defective areas covering the pores, scratches, chips causes corrosion of the base metal.

In addition, a disadvantage of known composition is also its dvuhyakornoe, i.e. the part of the components in the composition, the curing agent and the organic solvent can be injected immediately before painting, which causes inconvenience in use and limitations, and in some cases unproductive loss of material due to incorrect estimation of the amount of paint for the job.

Known composition anticorrosive composition containing a binder based on epoxy resin/MDI, epoxy resin/polyamine or cured under the influence of moisture, high molecular weight polyisocyanate, fine zinc powder and the solvent (DE 3531370, MKI 09D 5/08,1987). Anticorrosive treatment is carried out using a coating layer containing a binder based creatorial and clinoatacamite/MDI and solvent. Anti-corrosion treatment is carried out by pre-surface preparation, application of primer and then applying top coat at a temperature of 120±20°C.

The known composition of the primer provides obtaining coatings with good corrosion resistance and elasticity, which ensures long-term operation of the product in environments with increased aggressiveness. However, when applying the known composition on the surface is difficult to achieve a uniform thickness, and because of the heterogeneity and the sloppiness of the coating on the individual, the most "weak" areas have pockets of pitting corrosion. Also known composition during formation of the coating does not provide high adhesion to metal, which is necessary to prevent subsurface corrosion, and the composition is the two packages that creates some inconvenience when using it.

Known anticorrosive composition (Patent RF №2155784, IPC C09D 5/08, C09D 5/10, 2000), is used as the primer in the complex anti-corrosion systems, contains, wt%:

Superfine powder zinc50-78
Polystyrene and/or styrene rubber2,5-7,5
Organic solventthe rest of it.

To achieve the required corrosion protection in environments with medium and high corrosiveness, known composition, as a rule, is applied using a coating layer based on the aluminium-containing materials in the environment polymeric binder and solvent. Apply additional coating layers eliminates the increased porosity of the primer and provides additional corrosion resistance of the coating. The use of multi-layer anti-corrosion coating provides very effective protection against corrosion in environments with medium and high corrosion activity, however, is quite time-consuming and costly process.

Closest to the present invention is anticorrosive composition (Patent RF №2141984, IPC 6 C09D 5/08, 1999), intended for use as an independent corrosion-resistant coating to protect the metal surface, which comprises, in wt.%:

superfine zinc powder,
obtained by means of physical deposition from
the vapor phase, with a mass fraction of particles
from 4 to 12 μm is not less than 55 wt.%,
mass fraction of particles larger than 20 microns -
not more than 15 wt.%,47,0-87,0
high-molecular polymer is polystyrene and/or
the copolymer of styrene and rubber1,3-5,1
organic solventrest

Use as film-forming high molecular weight polymer of polystyrene and a copolymer of styrene and the rubber is allowed to receive tropicoco composition, to simplify the manufacturing technology of the composition by reducing the process temperature, to eliminate the harmful processes of degradation of the polymer with the formation of substances that cause corrosion of metal surface. The inventive polymer is inexpensive, environmentally safe. In addition, application of the composition as a polymer of polystyrene and a copolymer of styrene and rubber helped to increase the degree of filling of zinc (over 92%) and a high protective properties of the coating.

However, the practical use of known composition revealed the following shortcomings;

- not enough high physical-mechanical properties of coatings based on it, such as adhesion, impact strength, resistance to mechanical damage during transportation and installation of structures;

- not enough high protective properties in environments with medium and high corrosion activity, such as industrial and Maritime flair;

- low protective properties when the content in the composition of zinc less than 47.0% of zinc, while the reduction of zinc in the composition is important, first, because of the constant growth of prices for this metal; secondly, due to the lower density of the material and, as a consequence, the possibility to reduce consumption when applying;

high volumetric content of volatile substances (solvents), which leads, first, to the appearance of the porosity of the coating during the coating process when drying; secondly, to high values of the flow composition 1 unit area of the substrate, and hence to the relatively high cost of coverage;

- instability of the composition during storage, manifesting in some cases due to uncontrolled residual moisture in the raw material components and the air of the working zone in the manufacture of the composition. Nestabil the activity is manifested, first, in the form of significant deformation of the container (a"bulge" or "Bomba" packaging composition), which represents a danger to people and property during transportation, storage and use; secondly, the change of the rheological properties of the material (increase in viscosity or the formation of a dense hard stir precipitation). As a result of these phenomena claimed the warranty period of storage of the composition is 1 year, significantly reduced;

the relatively low viscosity of the composition, which does not allow to gain quite a high coating thickness at colouring in 1 layer without defects in the form of flows or drips.

Object of the invention is the improvement of physico-mechanical and protective properties of coatings based on the composition, reduction of defects in the coating when applied, reduces the consumption of the composition while maintaining the protective properties, the increase in stability during storage and increase shelf life.

The problem is solved due to the fact that in anticorrosive composition for coatings containing fine zinc powder, polystyrene and/or styrene rubber, an organic solvent and a rheological additive, added as a binder a polyisocyanate prepolymer, which is used as the aromatic polisiya atny prepolymer based diphenylmethanediisocyanate, water-absorbing additive in the following ratio, wt.%:

Powder zinc30,0-83,0
Polystyrene and/or styrene rubber2,2-9,2
Aromatic polyisocyanate prepolymer
based diphenylmethanediisocyanatefrom 0.6 to 4.9
Water-absorbing additives0,1-0,8
Rheological additive0,1-1,0
Organic solventrest

As the zinc powder used superfine powder of zinc produced in industry, for example, under the trademarks PCVD on THE 1721-002-12288779-2006 obtained by physical vapour deposition and particles having a spherical form with the following particle size distribution: particle fractions 4-12 μm is not less than 55 wt.%, particle fraction more than 20 μm is not more than 15 wt.% and with a specific surface area of more than 0.15 m2/year

As use polystyrene polystyrene General purpose according to GOST 20282-86 (brand PSM-115, TS is -111, PSM-118 and others)obtained by polymerization in mass (molecular weight 70000-200000) or technological waste (Burr, marriage formation); a copolymer of styrene and rubber according to GOST 28250-89 "high impact Polystyrene" (brand oops-1002, COC-0803, COC-0801, UPM-0508 and others) or waste processing (Burr, marriage formation and others), or a mixture of the above polystyrene copolymer of styrene and rubber.

As the polyisocyanate prepolymer using an aromatic polyisocyanate prepolymer based diphenylmethanediisocyanate (DHS). The polyisocyanate prepolymer get in industry interaction MDI (difenilmetana-4,4'-diisocyanate and/or difenilmetana-2,4'-diisocyanate) with simple or complex polyol. The content of isocyanate groups (NCO) in the range from 14 to 18% on dry residue. Domestic industry the polyisocyanate prepolymer produced according to TU 2311-035-12288779-2002 under the trade name - Lac POULENC®with the content of nonvolatile substances - more than 60 wt.%.

As the water-absorbing additives used reactive monofunctional isocyanate low viscosity - totalitarian (4-toluene-effect-free remedy isocyanate) and/or powdered molecular sieves - micronized highly porous crystalline aluminosilicate produced, for example, under the trademarks Additive TI and Sylosiv A3, respectively.

As the organic solvent used aromatic hydrocarbons, aliphatic hydrocarbons or esters, for example, oil solvent, xylene, white spirit, butyl acetate or mixtures thereof.

As rheological additives use bentonite or montmorillonite, or zinc oxide, or clay, or mica, or other known rheological additive for paints and varnishes. These supplements allow you to adjust the viscosity of the compositions, to reduce the rate of sedimentation of particles of zinc in containers during application of the composition, eliminate the formation of a dense hard stir precipitation during long-term storage of the paint.

The comparison of the proposed composition with the known leads to conclude a new qualitative composition characterized by a certain proportion of its ingredients. This allows to make a conclusion on the compliance of the claimed invention, the criterion of "Novelty".

Earlier in science and technology has been known the use of polyisocyanates as an integral part of the binder in the composition of the zinc-containing anti-corrosive compositions. However, science is not known, and the technique has not previously practiced sharing in the composition of the zinc-containing paint compositions of a mixture of thermosetting polymer (MDI) with an aromatic thermoplastic polim the rum (polystyrene). In our opinion, this is due to the fact that polystyrene or copolymer of styrene to rubber when interacting with polyisocyanate in the presence of finely dispersed zinc leads to the formation of gel-like structures, which cannot be used as a paint and varnish material. As shown by our study, this phenomenon can be eliminated by introducing into this mixture binder water-absorbing additives in the claimed amounts.

Sharing in corrosion-resistant zinc-rich paint formulations as a film-forming polymeric substances polystyrene and/or styrene rubber and MDI allowed:

to improve the physico-mechanical and protective properties of coatings based on the composition;

- to provide high protective properties of coatings with a lower content of zinc in the composition;

to widen the application of coatings on the basis of the composition due to the possibility of its use in more aggressive environments, in comparison with the known composition;

- to increase the volumetric content of nonvolatile substances in the composition, thereby reducing its consumption in the coating process;

- to increase the viscosity of the composition, improving its technological properties and reducing the probability of defects during the application.

Additive polystyrene and/or with whom alimera styrene-rubber MDI allows to change properties of the coating based on the composition by changing the structure and nature of communication with the metal base.

So, polystyrene and/or styrene rubber is a thermoplastic polymer that is inert, does not have an active functional groups. This is due to its high enough adhesion to steel, which is caused only by physical adsorption of the polymer. When using polystyrene as a film-forming substance forming the coating is effected by evaporation of the solvent. Since the molecules of polystyrene have high molecular weight and linear structure, coatings based on them have a fairly loose structure. This provides a high activity of zinc in zinc-rich coatings and their high protective properties, but at the same time leads to too rapid oxidation and dissolution of zinc in aggressive environments, and result in reduced service life, to limit the field of application and to the impossibility of reducing the zinc content without significant loss of the protective properties (content of zinc coating not less than 92% on the known invention).

The polyisocyanate prepolymers belong to thermosetting film-forming polymers. The formation of coatings on their basis is generated by evaporation of the solvent (if present), and due to the chemical reaction of NCO groups with monomers of different chemical nature, containing an active hydrogen atom. In this Declaration, the report of the case of this substance is water, contained in the air, i.e. the coating is cured in air moisture. During the course of this reaction is carbon dioxide and is formed of polyurethane coating with three-dimensional crosslinked structure. The heterogeneous nature of the urethane linkages and the three-dimensional structure of the coatings require high level of their protective and physico-mechanical properties. These coatings combine resistance to climatic factors and different chemical environments, elasticity, hardness, resistance to wear and shock.

Coatings based on polyurethane prepolymers characterized with a higher adhesion with the steel substrate (adhesion) due to the interaction of free NCO groups to the metal surface. Unlike polystyrene, where the adhesion is determined by the physical adsorption in this case is irreversible chemical adsorption, which leads to quality improvement in coating adhesion.

When used together as a film-forming substances polystyrene and/or styrene rubber and polyisocyanate of prepolymer formed coating combined structure: urethane three-dimensional lattice is embedded in the existing polystyrene matrix, strengthening it and giving it new properties. In this same structure and embedded particles of zinc, the surface is better wetted by plank is forming substance, in the result it is possible to reduce the high activity of zinc in the coating, increase protective and physico-mechanical characteristics of the coating (adhesion to steel (adhesion), the elasticity in bending, impact strength and mechanical effects, hardness), while maintaining high protective properties.

Sharing polystyrene and/or styrene rubber and polyisocyanate of prepolymer provides high protective properties in environments with medium and high corrosivity (industrial and marine atmosphere, salt fog, salt solutions and other). Since the protective properties increased due to the higher protective ability of the combined film-forming polymer, it becomes possible to reduce the zinc content in the composition without compromising the protective properties of the coating as a whole. Given the significant increase in the cost of zinc, it helps to reduce the cost of coverage.

The amount of organic solvent in the solution of the polystyrene used in the manufacture of known composition exceeds 84%. At lower solvent content of long chain molecules of polystyrene of high molecular weight do not dissolve, they are in solution in the form supramolecular structures: tangles, globules, etc. as a result plantours the existing properties of this solution deteriorates. Therefore, to obtain a paint composition, as a rule, use solutions of high molecular weight polymers with low concentrations. However, the viscosity of such solutions is small, and accordingly, the small and the viscosity of the compositions on their basis. A large amount of solvent and low viscosity compositions can cause such defects of the coating when applied as flows, drips and porosity.

Sharing polystyrene and/or styrene rubber and polyisocyanate of prepolymer in the claimed amounts ensures optimal values of yield strength and plasticity of the composition, and therefore, ensures the possibility of its application accepted industry methods and equipment. Additive polyisocyanate of prepolymer allows you to increase the plasticity of the composition and volumetric content of nonvolatile substances, which reduces the probability of occurrence of defects during application (drips, flows, porosity), as well as to reduce the consumption of material per unit surface. This is due to the fact that the polyisocyanate prepolymers contain no solvent, or the number of the latter is small and does not exceed 40%, and therefore supplementation increases the viscosity of the composition.

In General, the inventive composition allows to combine the advantages to the society of polystyrene/styrene rubber (relative cheapness, the availability and ease of use in the manufacture and application of the composition, the possibility of providing high protective properties of the coating) with the advantages of the polyisocyanate prepolymer (high strength adhesion to steel, high protective properties in environments with high and medium aggressiveness, low content of volatile substances in solution).

Additive in the composition of substances that absorb moisture, avoiding the gelatinization phenomenon, manifested adding polyisocyanates in polystyrol and/or a copolymer of styrene and rubber in the presence of zinc, as well as to improve the viability of the composition during storage, to eliminate the negative impact of uncontrolled moisture content in the raw material components and the air and moisture that enter into the composition in the process of its production.

Micronized highly porous crystalline aluminosilicate provides absorption of residual moisture in the solvent, and moisture adsorbed from the air by the dispersion of a powder of zinc, on the principle of molecular sieve.

Totalitarian reacts with residual moisture by chemical reaction and optionally remove the moisture adsorbed on the surface of the powder zinc. Integrated use of these water-absorbing additives increases the efficiency of dehydration.

The inventive composition containing fine zinc powder, high molecular weight polymer is polystyrene and/or a copolymer of styrene and rubber, the polyisocyanate prepolymer, water-absorbing additives and an organic solvent in the inventive ratios, allows to obtain an anticorrosive composition and coating on its basis, characterized by new properties in comparison with the prototype, namely:

- improved physico-mechanical properties and protective properties in environments with highly corrosive;

good tread and protective properties at reduced zinc content;

- higher volume content of non-volatiles, and consequently, lower values of the flow of the composition during application and environmental safety in the use, absence of defects, such as porosity;

- the stability of the storage, manifested in security during transportation and storage stability viscosity and sediment and, consequently, higher shelf life;

- the higher the viscosity, the ability to obtain a defect-free coating of higher thickness, to reduce the complexity of the painting.

Introduction rheological additives in the inventive composition allows you to adjust its viscosity to achieve the desired process performance and capability of application known in the art equipment and methods.

The above allows to conclude that, despite the fact that the polyisocyanate and polystyrene and/or styrene rubber was previously known as a binder for the zinc-containing compositions, however, from their joint use of the new technical result, which is not obvious and not directly follows from the previously known properties, and therefore, to conclude that the compliance of the decision criterion of "inventive step".

In the inventive composition, the total content of film-forming polymers higher than in the prototype (up to 14.1 wt.%), however, reduced the minimum and maximum limit of the content of powdered zinc (minimum of 30 wt.%). Thus, in the proposed composition in comparison with the prototype, the ratio of fine powder of zinc is: a foaming agent is shifted in favor of the foaming agent. In the stated quantitative values of the ingredients, the space between particles of zinc is much better filled polymers, and the particles themselves better soaked and related polymers. Since both of the used polymer, especially formed by curing the polyisocyanate prepolymer polyurethane, high chemical resistance, is substantially increased and the protective properties of the coating in environments with medium and high corrosivity. In addition, the increase in the content of film-forming polymer in comparison with the powder of zinc resulted in improved physical and mechanical properties of the coating: increased adhesion to steel; increased hardness of the coating, since zinc is a soft and ductile metal; improved elasticity of the coating, increased impact strength.

When the total content of the polymers is less than 2.8 wt.% (or zinc, more than 83 wt.%) worse technological, mechanical and protective properties of the composition. The deterioration of the technological characteristics is due to the fact that significantly increases the density of the composition (more than 3 g/cm3), the consistency of the composition approaches the pasty, which complicates its application, especially by spraying. A reduction in the content of the polymer is below 2.8 wt.% at high solvent content also leads to low values of elm the spine, to the appearance of stains on the floor when applied, to the need for repeated application of the composition to obtain a predetermined thickness. In compositions with low viscosity increased tendency to form dense hard stir precipitation during storage, due to the high density of the powder of zinc and its propensity for rapid settling.

When values of the polymer component is less than 2.8 wt.% (total), physico-mechanical and protective properties of coatings deteriorate because the film-forming substance is not sufficient to bind the particles of zinc. Worse adhesion to steel, decreasing elasticity, the coating becomes prone to chipping particles of zinc from it, even with a slight mechanical impacts, cracking, coating is easily scratched, not chin. The zinc coating is easily in contact with an aggressive environment, is rapidly oxidized and consumed, therefore, not implemented protective mechanism of protection and service life of the coating is reduced.

When the total content of the polymer component is more to 14.1 wt.% (total) and the content of finely powdered zinc less than 30 wt.%, particles of zinc in the coating are completely isolated from each other by polymeric membranes. Electrical contact between the particles of zinc is broken. This leads to the fact that the electrochemical potential is al coated steel is shifted in the positive direction compared with zinc. Protective properties of cinnabarinus coatings deteriorate or almost disappear, the protection of steel by cathodic mechanism is not implemented.

The increase in the content of polymer component in the composition is higher at 13.0 wt.% (total) also leads to a significant increase in its viscosity. In combination with low solvent content, its consistency is approaching pasty, which makes it difficult to use without dilution. In addition, compositions with a high content of the polymer differ unstable rheological characteristics during storage.

The content of the polyisocyanate prepolymer is about 20-30 wt.% of the total content of the polymer component, the rest is polystyrene and/or a copolymer of styrene and rubber. When the content of the MDI smaller than the stated number, his impact on the defensive and physical-mechanical properties of the coatings becomes insignificant. If more than the stated amount that is more than about 30% of the total amount of the polymer component, there is a deterioration of characteristics such as:

- shelf life due to the reaction of retinoblastoma in the song, which is accompanied by a significant increase in viscosity until "geleobrazovanie", loss uniformity (clots and plait is OK in the volume of the composition) or the formation of a dense not stir precipitation. Addressing these deficiencies is possible if the complexity of the formulation and introduction to more expensive components.

The content of water-absorbing additives in the inventive composition was determined experimentally. In their content in the composition is less than 0.1 wt.% the effect of these additives are practically does not appear, and when the content is more than 0.8 wt.%, significantly increases the cost, may be undesirable increase in turnover and the formation of streaks in the coating composition.

During long-term storage of the composition in the absence of a rheological additive, can cause precipitation of the zinc and the formation of a dense hard stir precipitation, and when applied composition may encounter technological difficulties associated with the use of airless application methods.

The excess content of rheological additives above the specified limit degrade the protective properties of the coating and increase the cost.

Thus, the new qualitative and quantitative composition of the claimed composition provides new properties of coatings based on them.

The claimed composition according to examples No. 1 to No. 8 was prepared as follows.

The required amount of an organic solvent and polystyrene and/or styrene rubber in the form of granules or dispersed waste mix on the complete homogenization of the mixture at temperatures of 20-50°C. Then in part (20-50%) of the required number of the obtained polymer solution load the powder zinc. Together with the first powder zinc can be introduced rheological additive. The input sequence in the composition of the water-absorbing additives depends on the type of additive. Totalitarian injected into a solution of polystyrene and/or styrene with rubber prior to the introduction of powdered zinc, aluminium silicate together with the last batch of powdered zinc.

The dispersion mixture is carried out at temperatures of 30-50°C until a homogeneous viscous paste in 20-60 minutes. In the resulting paste add the remaining part of the polymer solution and the polyisocyanate prepolymer and stirred for 15-60 minutes to hours to complete averaging of the composition.

To obtain compositions used the following raw materials.

As powder zinc used for superfine powder zinc brand PCVD-0 on THE 1721-002-12288779-2006 obtained by physical vapour deposition and particles having a spherical form with the following particle size distribution: particle fractions 4-12 μm is not less than 55 wt.%, particle fraction more than 20 μm is not more than 15 wt.% and with a specific surface area of more than 0.15 m2/year

As the film-forming polymer used high molecular weight thermoplastic polymer is polystyrene engineering nae is achene according to GOST 20282-86 brand PSM-115, the copolymer of styrene and rubber according to GOST 28250-89 "high impact Polystyrene" brand oops-1002, a mixture of the above polystyrene copolymer of styrene and rubber.

As the organic solvent used oil solvent or xylene or butyl acetate, or methoxypropylacetate, or white spirit, or mixtures thereof.

As the water-absorbing additives used totalization (4-toluene-effect-free remedy isocyanate) and micronized highly porous crystalline aluminosilicate in their mass ratio of 1:1.

As the aromatic polyisocyanate of prepolymer used lacquer "POLLAK"containing 14-18 wt.% isocyanate groups (NCO) to the dry residue.

As a rheological additive used Bentonite and Montmorillonite.

Anticorrosive processing standard steel sample size of 150×100×2 mm was performed by pneumatic spray declare (examples No. 1 to No. 8), control (samples No. 9 to No. 12) compositions and compositions of the prototype (sample No. 13 No. 15) to the dry metal surface, which has previously degreased, cleaned from rust and scale method for blast processing.

Data on the compositions of the claimed compositions (examples No. 1 to No. 8 according to the invention are given in table 1. Physico-chemical and technological properties of the compositions and physico-mechanical and protective is waista coatings, obtained using the claimed compositions was investigated by approved methods. The data obtained are shown in table 2.

Similarly were made of the control compositions (samples No. 9 to No. 12) and the compositions of the prototype (No. 13 No. 15). The data are shown in table 3. Study of physico-chemical and technological properties of the control compositions and coatings obtained with their use, carried out analogously to examples according to the invention No. 1 to No. 8. The data obtained are given in table 4.

Industrial tests were conducted coatings obtained using the claimed compositions (examples No. 1 to No. 8), showed that it has high physical-mechanical and protective properties of coatings:

the adhesion method of lattice cutsless than 2 points
impact strengthnot less than 100 cm
elasticity in bendingnot more than 3 mm
initial inpatient capacitydo not above-0.84
regarding silver chloride electrode
testing in a salt fog chamber withstands more than 2400 hours
without corrosive lesions
steel
the shelf life at 20°C in closed containersmore than 12 months

As can be seen from the comparative analysis of the data given in tables 2 and 4, the increase in the content of the polyisocyanate prepolymer over the stated interval (sample No. 10) leads to a significant increase in the viscosity of the composition and the loss of its homogeneity, and, consequently, to poor effective flowing property of the composition when applied to the surface, increasing the thickness of one layer and reduced shelf life (viability) 4-5 times. In addition, the protective properties of the coatings decreased by almost 1.5 times.

The reduction in the content of the polyisocyanate prepolymer lower than the stated number (example No. 12) leads to a significant decrease of physical-mechanical and protective properties of coatings - adhesion is reduced to 1.5 times the impact strength by 20%, and resistance to salt fog reduced by about 1.8 times.

When the number of water-absorbing additives against the declared quantity (sample No. 9), increases the viscosity of the composition, which changes their performance during storage, when is anesini on the surface composition badly spreads, reduced adhesion to metal, impact strength, elasticity and significantly reduces the resistance in the salt fog as compared with the composition according to the invention (example No. 4)containing the same amount of powder of zinc.

When you reduce the amount of desiccant additives below the lower limit (sample No. 11), as claimed in the invention, the viability of the composition is reduced by 3-4 times, there is swelling of the packaging, reduced resistance to salt fog as compared with the composition according to the invention (sample No. 6), containing the same amount of powder of zinc.

When going beyond the stated quantity of powder of zinc, there is a loss of protective properties (below the lower limit) or the receiving part, which may not be uniformly applied on the surface (above the upper limit).

Thus, beyond the stated limits of the declared ingredients, as well as the absence in the composition of any of the stated ingredients, does not lead to the achievement of the claimed technical result.

On the contrary, in the manufacture of compositions according to the invention, the technological properties of the obtained compositions, their viability and stability properties during storage provide an acceptable flow rate during formation of the coating desired t is shiny, provided high adhesive properties of the obtained coatings, as well as impact strength, elasticity in bending, resistance to salt fog and protective properties.

Table 1
Formulations of the inventive compositions
ComponentExamples
12345678
Powder zinc PCVD-030,039,042,050,060,070,080,083,0
Polystyrene PSM 1153,60,07,23,04,00,01,32,2
The copolymer of styrene and rubber STS-10023,6 9,20,03,00,03,41,30,0
The polyisocyanate prepolymer2,02,3a 4.93,01,62,01,00,6
Totalization0,00,40,40,50,40,00,20,4
The aluminosilicate0,30,00,20,30,40,10,20,2
Bentonite1,00.50,80,00,90,70,30,1
Montmorillonite0,00,00,00,80,00,00,00,0
Oil solvent38,00,044,50,00,00,015,70,0
White spirit0,023,90,010,00,00,00,00,0
Butyl acetatea 21.524,70,00,032,723,80,013,5
Methoxypropylacetate0,00,00,029,40,0that 0 0,00,0
TOTAL:100,0100,0100,0100,0100,0100,0100,0100,0

Table 3
Recipe control compositions
ComponentExamples
9101112131415
Powder zinc PCVD-050,060,070,080,047,059,070,0
Polystyrene PSM 1153,06,00,01,34,05,1 2,8
The copolymer of styrene and rubber STS-10023,00,03,41,30,00,00,0
The polyisocyanate prepolymer3,07,02,00,20,00,00.0
Totalization0,70,00,00,20,00,00,0
The aluminosilicate0,50,40,00,20,00,00,0
Bentonite0,80,40,70,30,00,03,0
M is norilana 0,00,00,00,00,00,00,0
Oil solvent0,00,00,08,549,035,924,2
White spirit10,00,00,00,00,00,00,0
Butyl acetate0,026,223,98,00,00,00,0
Methoxypropylacetate29,00,00,00.00,00,00,0
TOTAL:100,0100,0 100,0100,0100,0100,0100,0

1. Anticorrosive composition for coatings containing fine powder of zinc, polystyrene and/or styrene rubber and an organic solvent and a rheological additive, characterized in that it further comprises as a binder a polyisocyanate prepolymer, which is used as the aromatic polyisocyanate to prepolymer based diphenylmethanediisocyanate, water-absorbing additive in the following ratio, wt.%:

Superfine powder zinc30,0-83,0
Polystyrene and/or styrene rubber2,2-9,2
Aromatic polyisocyanate prepolymer
based diphenylmethanediisocyanatefrom 0.6 to 4.9
Water-absorbing additives0,1-0,8
Rheological additive0,1-1,0
The organic is the third solvent Rest

2. Anticorrosive composition according to claim 1, characterized in that as finely powdered zinc use zinc powder superfine obtained by physical vapour deposition and particles having the following particle size distribution: particle fractions 4-12 μm is not less than 55 wt.%, particle fraction more than 20 μm is not more than 15 wt.%.

3. Anticorrosive composition according to claim 1, characterized in that as the water-absorbing additives used totalization.

4. Anticorrosive composition according to claim 1, characterized in that as the water-absorbing additives use micronized highly porous crystalline aluminosilicate.

5. Anticorrosive composition according to claim 3 and 4, characterized in that totalitarian and micronized highly porous crystalline aluminosilicate used in a mass ratio of 1:1.

6. Anticorrosive composition according to claim 1, characterized in that as a rheological additive use bentonite.

7. Anticorrosive composition according to claim 1, characterized in that as rheological additives used montmorillonite.

8. Anticorrosive composition according to claim 1, characterized in that the organic solvent used oil solvent or xylene or butyl acetate, or met ciproflozacin, or white spirit, or mixtures thereof.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to anticorrosion zinc-containing coating compositions for corrosion protection of steel structures, objects and equipment used in average- and highly aggressive media and can be used in industrial and civil engineering, shipbuilding, motor car construction and bridge building for protecting engineering and hydraulic engineering structures, industrial and power installations, equipment of chemical and petrochemical industry, port structures. The anticorrosion composition contains finely dispersed zinc powder, zinc oxide, binder in form of chlorinated rubber, modified with alkyd resin with acidity of not more than 20 mgKOH/g and plasticised with chlorinated paraffin wax in a medium of organic solvent and target additives in form of polymerised amphoteric oil, organophilic bentonite and graphite.

EFFECT: obtaining one-pack anticorrosion composition with good processing characteristics with longer protection of coatings in average- and highly aggressive media.

4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to compositions for anticorrosion zinc-containing coating material of first coating, paint and enamel type for corrosion protection of steel structures, objects and equipment used in average- and highly aggressive media and can be used in industrial and civil engineering, shipbuilding, motor car construction and bridge building for protecting engineering and hydraulic engineering structures, industrial and power installations, equipment of chemical and petrochemical industry, port structures. The composition contains finely dispersed zinc power, binder in form of chlorinated rubber, epoxy resin, chlorinated paraffin wax and an organic solvent and target additives in form of polymerised amphoteric oil based on aromatic oil distillates, organophilic bentonite and additionally graphite.

EFFECT: obtaining one-pack anticorrosion composition with good processing characteristics with longer protection of coatings in average- and highly aggressive media.

4 tbl

FIELD: chemistry.

SUBSTANCE: anticorrosive composition for primer coat contains finely dispersed powder of zinc, polystyrene and/or styrene copolymer with rubber used as a binding agent, aromatic solver and 4,4'-diphenylmethanediisocyanate additionally. The method of anticorrosive treatment is carried out by applying over preliminary treated surface at least one primer coat prepared from the mentioned above composition with further applying at least one finishing coat.

EFFECT: preparation of one-package anticorrosive composition, flowability and plasticity of which is unchanged in water presence, providing high anticorrosive and chemical stability of treated surface designed for using articles in the conditions of continuous contact with water medium and atmosphere, having of higher mechanical and adhesive properties and providing with decreased material consumption during coat formation.

3 cl, 5 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: proposed composition consists of a semi-finished product and a hardener of polyisocyanate biuret No 31. The semi-finished product has the following ratio of components, in wt pts.: 42.0-55.4 epoxy-melamine-polyester lacquer "ЭП-074" with 55.4% content of non-volatile substances, 33.3-40.8 white titanium pigment TiO2 with rutile structure, 1.4-5.8 synthetic aerosil silica A-175 and 4.0-5.2 talcon MM-20 microtalc as filler, 4.7-19.0 P-189 solvent. The hardener is taken in quantity of 8-13.5 wt.pts per 100 wt pts of semi-finished product. The system of anticorrosion coating comprises a top layer, intermediate layer and a bottom layer. The top and intermediate layers of the system are made from the above mentioned composition. The bottom layer of the system is made from epoxide base coating material "ВГ-33", which contains specularite pigment.

EFFECT: invention increases adhesion to steel at low hardening temperature, impact strength and elasticity, increases the service life of the coating system.

2 cl, 5 tbl, dwg

FIELD: chemistry.

SUBSTANCE: proposed material contains a binder and filler. The binder is a Cu-Sn-Zn alloy, with the following ratio of components, in wt %: Sn - 1.0-4.0; Zn - 30-39 and Cu constitutes the rest. The filler is in form of industrial wastes of very hard materials in form of particles with size 2-4 mm. Content of the binder can be 20-30 wt %, and the filler - 70-80 wt %. The industrial wastes of very hard materials used can be ground wastes from a boring tool, cutter, as well as a carbide-tipped tool.

EFFECT: increased wear-resistance of working surfaces of machines and mechanisms due to use of wear-resistant coating material.

3 cl

FIELD: chemistry.

SUBSTANCE: invention relates to a composition that can be used for protection of metal surfaces of whatever machinery in contact with corrosion provoking media against corrosion. The composition includes the following components with their ratio in wt %, i.e. 100 of polymer binding epoxy dianic pitch, 20 to 30 of epoxyurethane oligomer modifier, 42 to 48 of organo-silicon amine hardener - γ-aminopropyletoxysilane, 25 to 30 of mineral filler, i.e. titanium dioxide (rutile), 22 to 25 of chromium phosphate inhibiting pigment, 20 to 60 of organic solvents, 3 to 4 of aerosol thixotropic agent, 10 to 20 of anti-rust additive of metal zinc. Xylene or acetone, either butyl acetate, or ethylcellosolve are used as organic solvents.

EFFECT: production of benzene-and water-proof coat with high adhesion properties.

2 tbl, 8 ex

FIELD: metal processing.

SUBSTANCE: invention refers to processing of polymeric functional materials and can be used in machine building at coating of machine and aggregate units and units of transport systems, mainly pipes for transmission of oil products. The method for producing metal-polymeric coating consists in mixing polymer particles in a powdered form and metal containing precursor particles in a powdered form. Then a powdered mixture is settled on the surface of a unit and heated; polymer particles are melted. After that, thermolysis of the precursor and monolithic integration of coating are carried out. Polymer particles in a powdered form are selected out of a group containing polyamide, polyethylene terephthalate and polyethylene of high pressure. Particles in a powdered form of metal containing precursor represent formate or oxalate of copper, nickel, zinc or carbonyl iron. Heating, melting of polymer particles and thermolysis of precursor are carried out simultaneously in a thermo gas flow with a density of 3·106 -9·106 Wt/m2 within 10-4-10-3 sec. The mixture is settled and monolithic integration of coating is performed on the unit heated to a temperature of T=Tm+5÷40°C, where Tm is the temperature of polymer melting at the density of the gas flow of 3-5 atm.

EFFECT: method allows for high processibility and upgrading of adhesion hardness, strength and rupture strength at tension.

2 tbl

FIELD: cathodic protection of metalwork.

SUBSTANCE: proposed paint-and-varnish material for corrosion protection of metalwork includes electrically conducting film-forming agent (electrically conducting polyethylene) and carbon nanotubes, from 10 to 80% of volume of paint-and-varnish material which increase electric conductivity and resistance to aggressive media and consequently mechanical strength of metalwork. Proposed paint-and-varnish material may additionally contain high-dispersed zinc powder ensuring additional cathodic protection from 40 to 90% of volume of paint-and-varnish material.

EFFECT: enhanced efficiency of corrosion protection of metalwork during protracted period of operation due to smooth electrical potential equal to potential of metalwork being protected.

5 cl, 1 tbl

FIELD: application of multi-layer priming coats for corrosion protection of metalwork subjected to action of aggressive media.

SUBSTANCE: proposed multi-layer coat at total thickness of 220-240 mcm consists of priming layer, 80-100 mcm thick, intermediate layer, 70-90 mcm thick and covering layer. Priming, intermediate and covering layers are formed from paint-and-varnish material on base of film-forming agent; this material contains 10-48 vol-% of carbon nano-tubes and 40-86 vol-% of highly-dispersed zinc filler.

EFFECT: enhanced resistance to action of aggressive media; increased service life of articles.

2 dwg, 8 ex

FIELD: chemical industry; printing industry; powder metallurgy industry; cosmetic industry; other industries; production and application of the highly anticorrosive metallic pigments.

SUBSTANCE: the invention is pertaining to production of the of the highly anticorrosive metallic pigments similar to laminas, which may be used in production of the printing ink, plastic materials, cosmetics, the powder coatings and in other branches of industry. The pigments have on their surfaces: the metallic substrates similar to the laminas and treated with the compounds of the phosphoric acid and-or the compounds of the boric acid; one or more layers of the coatings consisting of one or more hydrated oxides of the metals of one or more metals selected from the group, which includes silicon, aluminum, zirconium, titanium and tin. On the basis of the highly corrosive metallic pigments similar to laminas it is possible to produce the interferential colored pigments. The invention allows to increase the anticorrosive resistance of the metallic pigments at the expense of saving without the faults of the initial surface smoothness of the similar to the laminas metallic substrates, to increase the homogeneity and density of the layers of the hydrated oxides of the metals.

EFFECT: the invention ensures the increased anticorrosive resistance of the metallic pigments, saving the initial surface smoothness of the similar to the laminas metallic substrates, the increased homogeneity and density of the layers of the hydrated metals oxides.

40 cl, 9 ex, 4 tbl, 8 dwg

FIELD: production processes.

SUBSTANCE: blemished surface is covered with polyester resins Derakane 8084 as primer coat, after drying surface is covered with at least two layers of powder-bonded glass-fiber mat and three layers of surface film as reinforcing layer, these layers are resinated by Derakane 411-350, rolled, after drying protecting cover as wax top coat based on isophthalic polyester is applied.

EFFECT: improvement of coating service life.

3 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: described is a heat resistant coating composition containing the following, wt %: polyorganosiloxane resin - 20-25, pentaphthalic lacquer - 8-14, isobutylmethacrylate polymer - 5-7, heat resistant pigment - 11-17, filler - 5-10, rheological additive - 1-2, thickener - 1-2 and organic solvent - the rest. The composition contains porous silicate in form of pearlite or kieselguhr, and the heat resistant pigment is aluminium powder or heat resistant pigments of different colours.

EFFECT: increased sedimentation resistance during storage and provision for coating with high resistance to physical and chemical effects.

3 cl, 2 tbl, 15 ex

FIELD: chemistry.

SUBSTANCE: invention relates to anticorrosion zinc-containing coating compositions for corrosion protection of steel structures, objects and equipment used in average- and highly aggressive media and can be used in industrial and civil engineering, shipbuilding, motor car construction and bridge building for protecting engineering and hydraulic engineering structures, industrial and power installations, equipment of chemical and petrochemical industry, port structures. The anticorrosion composition contains finely dispersed zinc powder, zinc oxide, binder in form of chlorinated rubber, modified with alkyd resin with acidity of not more than 20 mgKOH/g and plasticised with chlorinated paraffin wax in a medium of organic solvent and target additives in form of polymerised amphoteric oil, organophilic bentonite and graphite.

EFFECT: obtaining one-pack anticorrosion composition with good processing characteristics with longer protection of coatings in average- and highly aggressive media.

4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to compositions for anticorrosion zinc-containing coating material of first coating, paint and enamel type for corrosion protection of steel structures, objects and equipment used in average- and highly aggressive media and can be used in industrial and civil engineering, shipbuilding, motor car construction and bridge building for protecting engineering and hydraulic engineering structures, industrial and power installations, equipment of chemical and petrochemical industry, port structures. The composition contains finely dispersed zinc power, binder in form of chlorinated rubber, epoxy resin, chlorinated paraffin wax and an organic solvent and target additives in form of polymerised amphoteric oil based on aromatic oil distillates, organophilic bentonite and additionally graphite.

EFFECT: obtaining one-pack anticorrosion composition with good processing characteristics with longer protection of coatings in average- and highly aggressive media.

4 tbl

FIELD: chemistry.

SUBSTANCE: base coat contains chlorine-containing polymer, pigment, plasticiser, organic solvent and rust solvent. The base coat also contains a texturing agent, a dispersing agent and an imidazole derivative. The chlorine-containing polymer used is a vinylchloride copolymer and components are in the following ratio, wt %: vinylchloride copolymer 10-20; plasticiser 3-6; texturing agent 0.2-0.6; dispersing agent 0.2-0.6; pigment 10-25; modifier-rust solvent 5-10; imidazole derivative 0.2-3.0; organic solvent - the rest.

EFFECT: use of the invention allows for depositing a base coat on an unprepared surface in a wide temperature range.

12 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a cold drying wear-resistant polymer composition, which can be used for protecting metal and concrete structures, for making floors and for other purposes. The composition contains the following components with their ratio given in pts. wt: 100 epoxy resin, 30.0 to 60.0 modifier, 40.0 to 80.0 flake reinforcement, 5.0 to 10.0 aerosil and/or 1.0 to 20.0 microtalc, 8.0 to 28.0 amine hardening agent. If necessary, the composition can contain a solvent in amount of up to 120 pts. wt. The modifier is butadiene-nitrile low-molecular rubber, or polysulphide rubber, or acrylic resin. The flake reinforcement is flaked silicon or iron mica. The amine hardening agent is a product of condensing N-methylol caprolactam with an aliphatic amine hardening agent, selected from a group which consists of diethylene triamine, triethylene tetraamine, polyethylene polyamine, or a mixture of the above mentioned product of condensing aliphatic amine, selected from a group which consists of diethylene triamine, tetraethylene tetraamine, polyethylene polyamine, and/or with organosilicon amine.

EFFECT: invention increases resistance to type B-3V synthetic oils, light resistance, adhesion to metal or concrete, elasticity, wear-resistance, hardness.

2 tbl, 11 ex

FIELD: chemistry.

SUBSTANCE: invention relates to heat-insulating coatings. The anticorrosion and heat-insulating coating is made from a water-suspension composition with viscosity ranging from 1 to 100 Pa·s. The water-suspension composition contains a mixture of 5 to 95 vol. % polymer binder with 5 to 95 vol % hollow microspheres. The polymer binder is a water-emulsion polymer latex composition, which contains from 10 to 90 vol. % (co)polymer, selected from a group which includes acrylate homopolymer, styrene-acrylate copolymer, butadiene-styrene copolymer, polystyrene, butadiene polymer, polychlorovinyl polymer, polyurethane polymer, vinylacetate polymer or copolymer, or their mixture and from 10 to 90 vol % mixture of water and surface active substance. The hollow microspheres are in form of microspheres with different sizes from 10 to 500 micrometres and different packed density from 50 to 650 kg/m3, selected form a group which includes hollow glass microspheres, hollow ceramic microspheres, hollow polymer microspheres, hollow technogenic microspheres or their mixture. The water-suspension composition also contains a mixture of polyatomic alcohol with polybasic carboxylic or amino acid in equimolecular ratio.

EFFECT: longer service life of composition in harsh climatic and industrial conditions.

2 tbl, 1 ex

Mastic // 2368637

FIELD: construction.

SUBSTANCE: invention is related to materials for protection against corrosion of pipeline metal surfaces and electric cables in metal casing, and also to materials for sealing of accumulators. Mastic based on asmol contains oil dissolvent, ASM glue, plasticiser, bivinyl styrene thermoplastic elastomer DST and syndiotactic 1.2 polybutadiene. Mastic may additionally contain chalk.

EFFECT: mastic has high resistance to loads due to increase of its strength characteristics, when mastic is applied onto polymer base, possibility is provided to use tape at low temperatures (up to -20°C).

2 cl, 1 tbl

FIELD: construction.

SUBSTANCE: filming agent represents distillation residue of 4,5,6,7-tetrahydroindole production.

EFFECT: filming agent is highly adhesive to metals and protects them efficiently against corrosion.

1 cl, 4 ex

Coating composition // 2363769

FIELD: chemistry.

SUBSTANCE: invention relates to compositions for coating base metals, to coating obtained from the said compositions, as well as to the method of obtaining the said compositions. The coating composition contains an aqueous mixture, containing particles, stable towards acids, and one or several fluoro-acids, where content of particles stable towards acids ranges from 0.005 to 8 wt % in terms of dry mass. The base metal coating contains particles, stable towards acids, attached to the base by a metal oxide matrix. Specific density of the base metal coating ranges from 5 to 50 mg/ ft2 (53.82 - 538.2 mg/m2). The method of producing the composition involves production of particles stable towards acids and one or several fluoro-acids, mixture of the said particles stable towards acids and one or several fluoro-acids in water, where pH of the coating composition ranges from 2 to 7, and content of particles stable towards acids in the coating composition ranges from 0.005 to 8 wt % in terms of dry mass.

EFFECT: invention allows for production of coating compositions, which significantly reduce the level corrosion of objects, containing several base metals.

40 cl, 3 dwg, 7 tbl, 20 ex

Heat protective dye // 2245350

FIELD: chemical industry, paint-vehicle systems, in particular heat protective dyes.

SUBSTANCE: claimed dye contains ceramic and corundum microspheres; resins, selected from group including silicone resin, polyesterepoxy resin, acrylic resin dispersions as binder; pigment; and aluminum powder as deflector. Such composition provides reduced heat loss into environment. Obtained dyes have thermal gradient, improved heat-retention properties and strength, and useful in corrosion and heat-loss protection of building construction, transport, gas and oil lines, heating systems, etc.

EFFECT: easier method for dye production; strength and homogenous heat protective dye layer of improved adhesiveness.

2 cl, 3 tbl

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