Corrosion protective polymer coating

 

The invention relates to corrosion protection two-element systems coating comprising an undercoat film and the outer coating, and can be used to protect metal pipes working in tough conditions. Anti-corrosion protective coating consists of a first element of a two-component primer composition comprising a solution in an organic solvent, a modified amine modifier epoxy basics primer composition and the amine hardener modified epoxy amine modifier in solution of an organic solvent. The second element is a polyurethane outer coating comprising a homogeneous adduct, obtained by the interaction of the epoxy oligomer or oligomers with epoxy number of 3.1-3.9 mgEQ/g 27-44 wt.%, a mixture of aromatic amines with amine number of the mixture 9-10,4 mgEQ/g 31,5-50,5 and coal tar pitch with a viscosity of 18 to 25 Centistokes and basicity of 1.3-1.5 mgequiv/g of HCl to 17.5-31.5 isocyanate curing agent, providing for the consolidation of the specified component. The ratio of the components in the primer film and the outer coating ensures the following is Le soaking in 3% NaCl solution at 60oWith within 30 days of 3.0-8.0 cm2. 4 C.p. f-crystals, 7 PL.

The invention relates to corrosion protection two-element systems coatings and can be used to protect metal pipes, working in the open air and under the ground in harsh operational conditions.

Corrosion protective coatings include two elements: 1) a primer film (primer), which protects the metal surface from the damaging effects of the environment and provide reliable adhesion to metal and to the outer coating; 2) outer coating that protects the primer film from mechanical damage during ground motions, from exposure to groundwater and identifying anti-corrosion properties.

Thus, long-term corrosion protective properties of the coating depend on the total system primer - the outer coating.

The most important indicators that determine the long-term protective properties of anti-corrosion coatings especially for pipes operating in corrosive environments, including the influence of electric potential are: 1) the adhesion of the primer to the metal, determined after soaking the sample in water after 1000 hours etc who support a 3% solution of sodium chloride at a polarization potential of 1.5 V At 60oWith within 30 days.

The standards for these types of tests are: for adhesion - not less than 4 MPa, for resistance to cathodic flaking - no more than 10 cm2.

In addition, rheological properties and the curing speed of both elements of the system should provide the possibility of applying them mechanically.

Known corrosion-resistant polymer coating (several versions) that meet the specified requirements and consisting of epoxysilane primer composition which includes a polyisocyanate curing agent and curing them epoxypropyl (the product of the interaction of epoxy resin with modifier - diola) in an organic solvent, which included also a number of additives: fillers, dispersants, agents suppress foaming, when the ratio of hardener to epoxypropyl providing an excess of Oh-groups to improve affinity between the primer and outer surface, and an outer polyurethane coating containing polyurethane forprimary curing agent (reaction product of MDI with diola) and cured them "active hydrogen component is a mixture of polyoxyalkylene or polyoxyalkylene with hydroxyl and/or amine number is S. h composition to increase the anti-corrosion effect and water resistance of the coating. The composition also includes various functional additives (up to ten) (RF patent 2072905, 6 05 D 7/22, publ. 10.02.97).

However, this corrosion-resistant coating consists of a complex compositions primer and coating, including expensive functional additives.

The invention solves the problem of expanding the range of anti-corrosion protective coatings by the mechanized method, simplification and cheapening of the elements of composition included in the corrosion-protective coating - primer and coating, as well as increasing resistance to cathodic flaking while retaining other long-term protective properties.

The invention consists in that the corrosion protective coating consisting of two elements: a two-component primer comprising component a solution in an organic solvent, a modified epoxy resin with additives (ES) and component B is curing agent, and a two-component polyurethane outer coating comprising a pre-polymer isocyanate curing agent and curing them component with the active hydrogen atoms contained in the hydroxyl groups and amine groups forming part of this is drexesteneasy connection (diola), and Eminem modifier from the group of the adduct of o-Chloroaniline and formalin, 3,31-dichloro-4,41-diaminodiphenylmethane, 4,41-diaminodiphenylmethane or a mixture of at least two of these ingredients, followed by dissolving the obtained modified ESTER in an organic solvent (acetone, toluene, methyl acetate, ethanol). As ES is most convenient to take industrial manufactured epoxy based primer B-EP-0237 from 11.5-13% of epoxy groups (TU 2312-478-0-05034239-97), representing a mixture of epoxygenase resin active diluent and suspended in the mixture of fillers and pigments; after modifying the number of epoxy groups is reduced to 9-10,5%curing of the modified ES is not the isocyanate curing agent, and an amine selected from the group of Triethylenetetramine, the adduct of formaldehyde, phenol and ethylene diamine (AF-2) or their mixture, with modified epoxy modifier from the group epoxygenase resin, polyoxypropyleneamine (Naproxin) with the content of epoxy groups of 9-15%, aliphatic chlorine-containing resin - polyoxypropyleneamine (Oxilan) or a mixture of at least two of these compounds, organic process is from.%: Component a Epoxy based primer B-EP-0237 - 50-72
Amine modifier, the above - 3-6
Organic solvent - 22-47
Component B
The above amine - 14-30
The above epoxy modifier - 12-20
Organic solvent - 52-74
The mass ratio of components a:B=1:0,50,8
two-component polyurethane outer coating as a component with the active hydrogen atoms in hydroxyl groups and amino groups contains a mixture polyoxyethyleneglycol, aromatic amine and coal tar, and homogeneous adduct obtained by the interaction of at least one epoxy oligomer with an epoxy number of 3.1-3.9 mgEQ/g or a mixture of at least two epoxy oligomers with epoxy number of the mixture of 3.1-3.9 mgmEq/g, a mixture of at least two aromatic amine with an amine number of the mixture 9-10,4 mgmEq/g and the average fraction of coal or shale resin with a viscosity of 18 to 25 Centistokes and basicity of 1.3-1.5 mgequiv/g of HCl, taken in the following ratio of ingredients, wt.%:
Epoxy ingredient:
Epoxy oligomer with an epoxy number of 3.1-3.9 mg
Amine ingredient:
A mixture of aromatic amines with amine number of the mixture 9-10,4 mgequiv/g - 31,5-50,5
The above fraction of coal or shale resin with a viscosity of 18 to 25 Centistokes and basicity of 1.3-1.5 mgequiv/g of Hcl - 17,5-31,5
As mentioned epoxy oligomers can be included the following oligomers, as well as the active solvent is a low molecular weight epoxy resin based water and epichlorohydrin (e-181), epichlorohydrin and atrial (EET) and epichlorohydrin and phenol (EFG), are shown in table A.

As aromatic amines may be included amines listed in the table.B.

The curing component with the active hydrogen atoms carry out industrial pre-polymer isocyanate hardeners "Traitor" beyond 38.403871-99 or SURAL-ML" beyond 2294-002-4689377-01 representing a urethane prepolymer containing 13-14% of free isocyanate groups.

The combination of these elements corrosion protective polymer coating provides a higher resistance to cachedname flaking compared to other systems, both consist of a small number of available ingredients without the inclusion of expensive f the I the following examples:
I. Receiving a first coat
a) obtaining the component (examples a-1A-6)
In a porcelain or glass Cup take a sample of epoxy basics primer B-EP-0237 and amine modifier is heated until complete homogenization of the solid modifier, mix until the termination of the reaction, the mixture at a temperature of 65-70oWith the injected solvent and thoroughly mixed, cooled to room temperature and filtered.

The structure of the component As shown in table 1.

b) receiving component B (examples B-1B-6)
In a vessel with a mechanical stirrer download the solvent. In the amine solvent type, add epoxy modifier, mix thoroughly.

The composition of component B are presented in table 2.

C) obtaining primers (examples 1-9)
To the component And add the component B in the amount indicated in table 3, mix thoroughly, put on a metal device airless spray, brush or roller. To obtain samples for testing primer thickness of 60-100 μm is applied on the pre-openastromenace plates of steel St-3 size of 100x100 cm and determine the drying time "until tack-free" and swell in water.

II. Getting outdoor on who exemplify diaminodiphenylmethane and aminothiadiazole, add naproxin 703. The temperature of the support in the range of 40-50oWith, then injected shale resin with a viscosity of 18 to 20 cSt and basicity of 1.3 mg EQ/g HCl and stirred for hours at a residual pressure of 20-30 mm RT.art., the temperature was then raised to 80oC and stirred for 3 hours. After cooling the adduct is ready to use. The ingredients are taken in amounts shown in table 4. Similarly received and other composition component with active hydrogen atoms, the composition of which is given in table 4.

b) obtaining a composition for a coating
Take the finished hardener "Traitor" or "CORAL-ML".

To obtain a coating obtained adduct (a component with the active hydrogen atoms) is dosed and mixed with hardener using units with separate vacuum supply components in a volume ratio of 1.34:1.

To obtain samples for testing coating is produced on a metal plate with already applied with primer (after exposure of 4-6 hours. After exposure (not less than 2 weeks) determine adhesion by peeling and resistance to cathodic detachment.

Similar samples have been taken other anti-corrosion systems. Elements of systems ayh, the inventive corrosion-resistant polymer coating:
1. Provides high level of protection of metal surfaces from corrosive factors;
2. On resistance to cathodic flaking than the known systems and other combinations of known elements.


Claims

1. Anti-corrosion protective coating for steel surfaces, consisting of two elements: a two-component primer coating based on component A, comprising a solution of modified epoxy resins with additives in an organic solvent, and the component B - hardener, and two-component polyurethane outer coating comprising a pre-polymer isocyanate curing agent and curing them component with the active hydrogen atoms of hydroxyl groups and amine groups, wherein component a primer coating as epoxy resin with additives contains epoxy based primer B-EP-237, which is a mixture of epoxygenase resin active diluent with suspended therein fillers and pigments, as a modifier of epoxy resin - aminy modifier, selected from the group of the adduct of o-Chloroaniline and different amines, component B is the curing agent contains an amine selected from the group including Triethylenetetramine, the adduct of formaldehyde, phenol and ethylene diamine or a mixture thereof, and optionally an epoxy modifier selected from the group comprising epoxygenase resin, polyoxypropyleneamine with the content of epoxy groups of 9-15%, polyoxypropyleneamine or a mixture of at least two of these compounds in the environment organic solvent in the following ratio of ingredients, wt. %:
component And
A mixture of epoxygenase resin active diluent with suspended therein fillers and pigments - 50-72
The specified amine modifier - 3-6
Organic solvent - 22-47
component B
The specified amine - 14-30
Specified epoxy modifier - 12-20
Organic solvent - 52-74
when the mass ratio of component a: component B 1: 0.5 to 0.8, and two-component polyurethane outer coating as a component with the active hydrogen atoms of hydroxyl and amino groups contains the adduct obtained by the interaction of at least one epoxy oligomer with an epoxy number of 3.1-3.9 mgEQ/g or a mixture of at least two epoxy oligomers with e is with amine number of the mixture 9-10,4 mgmEq/g and the average fraction of coal or shale resin with a viscosity of 18 to 25 Centistokes and basicity of 1.3-1.5 mgequiv/g of HCl, taken in the following ratio of ingredients, wt. %:
Epoxy oligomer with an epoxy number of 3.1-3.9 mgEQ/g or a mixture of epoxy oligomers with epoxy number of the mixture of 3.1-3.9 mgequiv/g - 27-44
A mixture of aromatic amines with amine number of the mixture 9-10,4 mgequiv/g - 31,5-50,5
The specified fraction of coal or tar - 17,5-31,5
when the ratio of pre-polymer isocyanate hardener component with active hydrogen atoms, providing a curing component with active hydrogen atoms.

2. Anti-corrosion protective coating for steel surfaces under item 1, characterized in that the two outer polyurethane coating as epoxy oligomer with an epoxy number of 3.1-3.9 mgEQ/g or a mixture of epoxy oligomers with epoxy number of the mixture of 3.1-3.9 mgEQ/g contains oligomers from the group comprising epoxygenase oligomers, polyoxypropyleneamine with the content of epoxy groups of 9-15%, active epoxy rasb protective coating for steel surfaces by p. 1, wherein the outer polyurethane coating as a mixture of aromatic amines with amine number of the mixture of 9.0-10.4 mgEQ/g contains any combination of at least two amines selected from the group comprising aminobenzylpenicillin, diaminodiphenylmethane, 1,3,5-triisopropyl-2,4-diaminobenzene, triethylamine, triethylamine.

4. Anti-corrosion protective coating for steel surfaces on PP. 1-3, characterized in that component And two-component primer composition contains a solvent selected from the group comprising acetone, toluene, ethanol, methyl acetate or a combination thereof.

5. Anti-corrosion protective coating for steel surfaces on PP. 1-4, characterized in that component B-component primer composition contains a solvent selected from the group comprising xylene, methylethylketone, dimethylsilanol or a combination thereof.

 

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FIELD: hydraulic insulating materials for hydraulic insulation and corrosion prevention of concrete, metal and reinforced concrete structural surfaces.

SUBSTANCE: claimed composition contains: butadiene-styrene thermoelastomer, diepoxy resin, filler (carbon black), solvent (toluene), pigment filler, containing aluminum and iron hydroxides and additionally indene-coumarone resin, waterproofing agent (liquid polymethylsiloxane), and stabilizer.

EFFECT: composition with high adhesion to concrete and metal surface and improved strength.

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