Method for applying anti-corrosive layer to metallic surface and composition for anti-corrosive layer

FIELD: corrosion prevention technologies.

SUBSTANCE: method includes serial application of layers of polymer compositions to metallic surface, while serial layers of polymer compositions are made with various thermal expansion coefficients. As said polymer composition polyurethane compound is used with special admixtures and filling agent, influencing thermal expansion coefficient of covering layer, and content of said filling agent in each following layer is set less than content of said filling agent in previous layer.

EFFECT: higher efficiency.

2 cl, 9 ex

 

The invention relates to the field of protection of pipes or pipe fittings against corrosion or the formation of undesirable deposits, as well as to the field of multilayer coatings of metallic material.

Known methods of applying a corrosion-resistant coating on a metal surface, comprising the sequential application of the metal surface layers of polymer compositions, and compositions for corrosion protection of the metal surface (for example, RU # 2138726, F 16 L 58/04, 1999).

The closest analogue of the proposed technical solution is the method of applying a corrosion-resistant coating on a metal surface, comprising the sequential application of the metal surface layers of polymer compositions (US No. 5792518 F 16 L 58/10,1998).

The closest analogue of the claimed composition is a composition for corrosion protection of the metal surface containing polyurethane compound with targeted supplements (RU # 2192441, C 09 D 175/08, 2002).

The known method and composition relatively little adapted for application to the surface of existing or mount the piping directly on site, as they require careful preparation of the surface with the use of special tools and pre-heating the metal surface, and materialarray. Thus obtained coating by thermal deformation does not have the required strength and durability due to the use of materials with different structure and composition.

The challenge which seeks the invention is to provide effective means for corrosion protection of the metal surface directly as in the construction of pipelines, and to restore the coverage of existing pipelines.

The technical result that can be obtained by carrying out the claimed method, is to provide conditions for creation of strong and durable corrosion-resistant coating, not subject to destruction when exposed to thermal deformation.

This technical result is achieved by a method of applying a corrosion-resistant coating on a metal surface, comprising the sequential application of the metal surface layers of polymer compositions due to the fact that successive layers of polymer compositions performed with different coefficients of thermal expansion, the polymeric composition applied polyurethane compound with the target additives and fillers that affect the coefficient of thermal expansion of the coating and the contents of the specified voltage is nitela in each subsequent layer is set less than the contents of the specified filler in the previous layer.

And also due to the fact that polyurethane compound are before applying to the metal surface by dispersing in a hydrophilic prepolymer with the polyisocyanate component of the suspension of the specified filler in epoxy with targeted supplements, and the contents of the specified filler in the coating layer is set by varying the number specified suspension in the composition.

The technical result that can be obtained using the claimed composition is to create means for implementing the above method.

This technical result is achieved by a composition for corrosion protection of the metal surface containing polyurethane compound with targeted supplements, due to the fact that it further contains as a filler powder, influencing thermal expansion coefficient of the coating.

And also due to the fact that it contains as a powder, influencing thermal expansion coefficient of the coating, powder of red iron oxide with a mass fraction of iron oxide is not less than 65% and an effective amount specified powder not less than 15 wt.% and not more than 25 wt.%.

And also due to the fact that it further comprises a powder reactive filler.

And also accounts for the fact, it contains as reactive filler is carbon black and an effective amount specified powder is not less than 0.5 wt.% and not more than 6.5 wt.%.

The essence of the claimed technical solution is illustrated in the following example implementation of the method.

As a resin composition for anti-corrosion coatings prepared two part polyurethane compound. The first part of the delivery status of THE 2224-009-21062608-96 has the structure of a homogeneous viscous transparent liquid without mechanical impurities and is hydrophilic prepolymers with polyisocyanate component (with a content of free NCO-groups in the amount of 15-20 wt.%). The second part is performed by formation of a suspension by mixing filler, influencing thermal expansion coefficient of the coating, and epoxy resin with targeted supplements. As filler, influencing thermal expansion coefficient of the coating can be applied powder of red iron oxide with a mass fraction of iron oxide is not less than 65% or other substances (for example, the ochre powder or a powder mixture of oxides of Fe, Al and Si).

As the target additives in the composition may contain a solvent (e.g., solvent, and dibutyl phthalate), inert filler (e.g. talc), thixotropic additive (for example, Aerosil) and rode the congestion (e.g., diethanolamine), and for surface layer formation as a reactive powder filler, in particular carbon black (for example, with a nominal specific surface area, m2/g 14-18).

The first and second parts of polyurethane resin mixed by dispersion mentioned suspension in the hydrophilic prepolymer with the polyisocyanate component. In the process performing this action produces a composition comprising a polyurethane compound, and optionally, powder filler, influencing thermal expansion coefficient of the coating. The content of the latter in the composition for formation of the respective layers of the coating (the contents of the specified filler in each subsequent layer should be less than the contents of the specified filler in the previous layer) set by changing the number of said suspension in the composition.

In particular, for the first (primer) layer create a composition with the ratio of ingredients, wt.%:

- epoxy - 15,

- solvent - 15,

- red iron oxide - 25,

- dibutyl - 7,

- talc - 10,

presented to 1.0,

- diethanolamine - 0,1,

- hydrophilic prepolymer with polyisocyanate component - rest;

for the second layer to create a composition with the ratio of ingredients, wt.%:

- epoxy - 15,

- solvent - 15

- red iron oxide - 20,

- dibutyl - 7,

- talc - 10,

presented to 1.0,

- diethanolamine - 0,1,

- hydrophilic prepolymer with polyisocyanate component - rest;

for the third (top) layer to create a composition with the ratio of ingredients, wt.%:

- epoxy - 15,

- solvent - 15,

- red iron oxide - 15,

- dibutyl - 7,

- talc - 10,

presented to 1.0,

- diethanolamin -0,1,

- soot - 6,

- hydrophilic prepolymer with polyisocyanate component - the rest.

An effective amount of filler, influencing thermal expansion coefficient of the coating, is the range of not less than 15 wt.% and not more than 25 wt.%. When quantity is less than 15 wt.% his presence has no significant effect on thermal expansion coefficient of the coating, and an increase of more than 25 wt.% does not change the coefficient of thermal expansion. An effective amount of the reactive filler is carbon black in a range not less than 0.5 wt.% and not more than 6.5 wt.%. When the amount of carbon black is less than 0.5 wt.% its presence has no effect as a reactive filler, and an increase of more than 6.5 wt.% leads to reduction of the dielectric properties of the coating.

Technology of application of anti-corrosion coating of metal surfaces predusmatriva is no consistent for each layer alternating preparation of appropriate composition, drawing on the metal surface and the exposure of each layer to achieve the state of polymerization of the composition.

Such regulations consistent coating on the metal surface layers of polymer compositions allows to ensure a consistent change its physical and chemical properties in the direction from the protected surface to the coating layers including, in particular coefficient of thermal expansion, and the composition of ingredients of the composition provides for the establishment of a coating directly on the site. Specified ultimately reduces the stress gradient of the coating material when thermal deformation of the metal surface and/or coating and thereby contributes to maintaining the integrity of the connection of the cover with the metal surface.

Examples of the properties of the coating layers using different composition

ExampleThe content of the ingredient, wt.%Properties of the coating
1red iron oxide - 25the resistance of the coating is 500 hours at 150°
epoxy - 15, dibutyl - 7,
solvent - 15,
talc - 10,
Aerosil 1,0,
diethanolamin - 0.1,the
hydrophilic prepolymer - rest.
2red iron oxide - 15the resistance of the coating is 300 hours at 150°
epoxy - 15, dibutyl - 7,
solvent - 15,
talc - 10,
Aerosil is 1.0,
diethanolamin - 0.1,the
hydrophilic prepolymer - rest.
3red iron oxide - 10the resistance of the coating is 250 hours at 150°
epoxy - 15, dibutyl - 7,
solvent - 15,
talc - 10,
Aerosil is 1.0,
diethanolamin - 0.1,the
hydrophilic prepolymer - rest.

ExampleThe content of the ingredient, wt.%Properties of the coating
4red iron oxide - 30the resistance of the coating is 500 hours at 150°C (maximum values in example 1). Increased viscosity and is difficult to apply the composition on the protected surface
epoxy - 15, dibutyl - 7,
solvent - 15,
talc - 10,
Aerosil is 1.0,
diethanolamin - 0.1,the
hydrophilic prepolymer - rest.
5soot - 6,5the wear-resistant coating - (520 cycles when the load is 0.023 MPa, the volume resistivity of the coating Rv- 1·108Ohm·cm
epoxy - 15,
dibutyl - 7,
solvent - 15,
talc - 10,
red iron oxide - 15,
Aerosil is 1.0,
diethanolamin - 0.1,the
hydrophilic prepolymer - rest.
6soot - 0,5volume resistivity of the coating is 2.5·1012Ohm·cm
epoxy - 15,
dibutyl - 7,
solvent - 15,
talc - 10,
red iron oxide - 15,
Aerosil is 1.0,
diethanolamin - 0.1,the
hydrophilic prepolymer - rest.
7soot - 0,3the wear-resistant coating - 260 cycles at load is 0.023 MPa
epoxy - 15,
dibutil the Talat - 7,
the solvent -15,
talc - 10,
red iron oxide - 15,
Aerosil is 1.0,
diethanolamin - 0.1,the
hydrophilic prepolymer - rest.
8soot - 8,0volume resistivity of the coating -7,5·107Ohm·cm
epoxy - 15,
dibutyl - 7,
solvent - 15,
talc - 10,
red iron oxide - 15,
Aerosil is 1.0,
diethanolamin - 0.1,the
hydrophilic prepolymer - rest.

1. The method of applying a corrosion-resistant coating on a metal surface, comprising the sequential application of the metal surface layers of polymer compositions, characterized in that the successive layers of polymer compositions performed with different coefficients of thermal expansion, the polymeric composition applied polyurethane compound with the target additives and fillers that affect the coefficient of thermal expansion of the coating and the contents of the specified filler in each subsequent layer is set less than the contents of the specified filler in the previous layer.

2. The method according to claim 1, characterized in that the polyurethane compound are before applying to the metal surface by dispersing in a hydrophilic prepolymer with the polyisocyanate component of the suspension of the specified filler in epoxy with targeted supplements, and the contents of the specified filler in the coating layer is set by varying the number specified suspension in the composition.

3. Composition for corrosion protection of the metal surface containing polyurethane compound with targeted supplements, characterized in that it additionally contains as a filler powder, influencing thermal expansion coefficient of the coating.

4. The composition according to claim 3, characterized in that it contains as a powder, influencing thermal expansion coefficient of the coating, powder of red iron oxide with a mass fraction of iron oxide is not less than 65% and an effective amount specified powder not less than 15 wt.% and not more than 25 wt.%.

5. The composition according to claim 3 or 4, characterized in that it further comprises a powder reactive filler.

6. The composition according to claim 5, characterized in that it contains as reactive filler is carbon black and an effective amount specified powder is not less than 0.5 m is S.% and not more than 6.5 wt.%.



 

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