Technique of anticorrosive plating on metallic surface and composition for anticorrosive plating of metallic surface

FIELD: metallurgy.

SUBSTANCE: invention concerns field of tubes or fittings protection against corrosion or against formation of undesirable deposition, and also concerns field of metallic material multiple coating. It is implemented consecutive plating on metallic surface layers with different coefficients of thermal dilatation from suspension of polymer compound, containing polyurethane compound with admixture, influencing on coefficient of thermal dilatation and soaking of each layer till composition polymerisation. In the capacity of admixture influencing on coefficient of thermal dilatation of polymeric composition, it is used catalytic admixture and applied each of following layers from suspension of polymeric composition, containing greater quantity of catalytic admixture, than previous layer. Suspension contains catalytic admixture in amount 0.01-3 wt % per 1 kg of suspension.

EFFECT: providing of creation of durable and lasting anticorrosive coating, not subjected to destruction in conditions of temperature cycling, impingement attack and abrasive action.

5 cl, 1 tbl

 

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 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, CL F16L 58/10, 1998).

Also known composition for corrosion protection of the metal surface containing polyurethane compound with targeted supplements (RU # 2192441, CL C09D 175/08, 2002).

The known method and composition are not flexible enough to be applied on the surface of existing or mount the piping directly on site, as they require careful surface preparation for coating with the use of special tools and pre-heating the metal surface and the coating material. Thus obtained coating does not have sufficient property to maintain the required strength and durability during thermal Cycling due to the use of materials with different structure and composition.

The closest technical solution to this invention is a method - a method of applying a corrosion-resistant coating on a metal surface, comprising p is coherent coating on the metal surface layers with different coefficients of thermal expansion of the suspension polymer composition, containing polyurethane compound with the addition of influencing the coefficient of thermal expansion and exposure of each layer to the polymeric composition, and part of the suspension is a suspension of polymer compositions for coating an anticorrosive coating on a metal surface containing polyurethane compound with the addition of influencing the coefficient of thermal expansion (RU # 2252978, CL SS 28/00, 2004).

In the mentioned patent the basic principle of reducing stresses in multilayer coating is change the content in the layers of thermally active filler, and for each of the layer components are mixed in different proportions, that is actually preparing compositions with different chemical composition.

But this creates unnecessary workload and increases time on this process, particularly in the preparation of components in the field (on site). In addition, the lack of compositions patent No. 2252978 is the presence of as one of the ingredients of the solvent (a solvent), which in some cases makes it difficult carrying out work in confined spaces and requires funds to provide forced ventilation, and the presence of solvent in the compositions (increases fire and bursts opasnosti in General).

The technical result, which directed the invention is to provide a strong and durable corrosion-resistant coating, not subject to destruction under conditions of thermal Cycling, shock and abrasive effects when it is created from the suspension polymer compositions of the same chemical composition.

To achieve the technical result in the method of applying a corrosion-resistant coating on a metal surface, comprising the sequential application of the metal surface layers with different coefficients of thermal expansion of the suspension polymer compositions containing polyurethane compound with the addition of influencing the coefficient of thermal expansion and exposure of each layer to the polymeric composition, as an additive, affecting thermal expansion coefficient of the polymeric composition, use of catalytic additive and cause each successive layer of the suspension polymer compositions containing higher amounts Catholic additives than the previous layer.

And the fact that the suspension of the polymer composition is formed prior to application to the metal surface by introducing into the emulsion hydrophilic prepolymer with polyisocyanate component highly filled compositions is AI, followed by dispersion and adding in the last catalytic additives.

To achieve the technical result in the suspension of the polymer composition for coating an anticorrosive coating on a metal surface containing polyurethane compound with the addition of influencing the coefficient of thermal expansion, as an additive, affecting the coefficient of thermal expansion, it contains a catalytic additive in an amount of 0.01-3 wt.% 1 kg of the suspension.

And also the fact that as catalytic additives it contains diethanolamine, or dimethylethanolamine, or dibutylthiourea tin, or a mixture, or a mixture of any two of them.

And the fact that the contents of catalytic additives in the range of from 0.01 to 3 wt.% 1 kg of the suspension depends on the type of catalytic additives and the sequence of layers in the coating.

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

Assume that you run the three-layer coating.

Each layer is a suspension of the polymer composition, which is prepared prior to application to the metal surface by introducing into the emulsion hydrophilic prepolymer with the polyisocyanate component of the filled compositions with subsequent dispersion to obtain a suspension and adding in the last catalic the terms Supplement.

For the first layer create the following suspension polymer composition:

1. Ingredients filled compositions:

the epoxy resin ED-20- 5-10 wt.%
- Laprol 502- 15
- castor oil- 7
the viscosity regulator PB- 5-10
- red iron oxide- 15
- barium sulphate- 10
- Aerosil- 0,5

2. The ingredients of the emulsion:

- hydrophilic prepolymer with polyisocyanate component with trichloracetate - rest.

3. The additive catalyst is 0.1 to 1.0.

The mass ratio of the filled compositions of emulsion is 3:2 respectively.

1. For the second layer to create a suspension of polymer compositions in the following composition:

the epoxy resin ED-20- 5-10 wt.%
- Laprol 502- 15
- castor oil- 7
the viscosity regulator PB- 5-10
- red iron oxide- 15
- barium sulphate- 10
- Aerosil- 0,5

2. Ing eventy emulsion:

hydrophilic prepolymer with polyisocyanate component with trichloracetate - rest.

3. Additive catalytic - 1,1-2,0.

The mass ratio of the filled compositions of emulsion is 3:2 respectively.

1. For the third layer creates a suspension of polymer compositions in the following composition:

the epoxy resin ED-20- 5-10 wt.%
- Laprol 502- 15
- castor oil- 7
the viscosity regulator PB- 5-10
- red iron oxide- 15
- barium sulphate- 10
- Aerosil- 0,5

2. The ingredients of the emulsion:

hydrophilic prepolymer with polyisocyanate component with trichloracetate - rest.

3. Additive catalytic - 2.1 to 3.0.

The mass ratio of the filled compositions of emulsion is 3:2 respectively.

An effective amount of catalytic additives influencing thermal expansion coefficient of the coating, is the range of not less than 0.01 and not more than 3.0 wt.% 1 kg of the resulting suspension. When the content of the catalytic additive is less than 0.01 wt.% 1 kg of the resulting suspension its not its the effect on the coefficient of thermal expansion, and the content of more than 3 wt.% 1 kg of the resulting suspension leads to the impossibility of applying the suspension polymer compositions for coating because of its rapid polymerization.

Technology of application of a corrosion-resistant coating on a metal surface provides consistent for each layer interleaving the preparation of the corresponding suspension of the polymer composition with a catalytic additive, applied onto the metal surface and the exposure of each layer to achieve polymerization of the composition.

The sequence of deposition on the metal surface of the respective layers of the suspension polymer composition allows to ensure a consistent change of physico-chemical properties of the coating in the direction from the protected surface to the top layers, inclusive, namely the coefficient of thermal expansion, and the ingredients of the suspension polymer composition provides for the establishment of coating even on the job site. The said composition promotes relaxation of stresses in the coating material in thermal deformation of the protected metal surface and/or coating, which ultimately contributes to maintaining the integrity of the connection of the cover with the metal surface.

Examples of changes in the properties of the multilayer coating using different amounts of catalytic additives in its layer-by-layer formation. (For example, the coating consisting of three layers)
# exampleThe content of catalytic additives in layers, wt.%Properties of the multilayer coating after test benchNotes
1st layer2nd layer3rd layerResistance to impact, sm GOST 4765-73The adhesion score according to GOST 15140-78The abrasion resistance (cycles when the load is 0.023 MPa by the method of the Akha impalila)
1.0,011,12,1401430The combination of protective properties that meet the requirements for the coating of heat pipelines.
2.0,51,52,5402450The combination of protective properties that meet the requirements for the coating of heat pipelines.
3.1,02,03,035 3460The combination of protective properties that meet the requirements for the coating of heat pipelines.
4.0,0050,51,0402260Insufficient abrasion resistant coatings that do not meet the requirements for coatings of heat pipelines
5.1,52,53,5254500Insufficient adhesion and impact resistance does not satisfy the requirements for the coating of heat pipelines

1. The method of applying a corrosion-resistant coating on a metal surface, comprising the sequential application of the metal surface layers with different coefficients of thermal expansion of the suspension polymer compositions containing polyurethane compound with the addition of influencing the coefficient of thermal expansion and exposure of each layer prior to polymerization of the composition, characterized in that the additive affecting the coefficient of thermal expansion of the polymeric composition, use of catalytic additive and cause each successive layer of the suspension polymer is oppozitsii, containing higher amounts of catalytic additives than the previous layer.

2. The method according to claim 1, characterized in that the suspension of the polymer composition is formed prior to application to the metal surface by introducing into the emulsion hydrophilic prepolymer with the polyisocyanate component of the filled compositions with subsequent dispersion and addition of catalytic additives.

3. Suspension resin composition for coating an anticorrosive coating on a metal surface containing polyurethane compound with the addition of influencing the coefficient of thermal expansion, characterized in that the additive affecting the coefficient of thermal expansion, it contains a catalytic additive in an amount of 0.01-3 wt.% 1 kg of the suspension.

4. The suspension according to claim 3, characterized in that as catalytic additives it contains diethanolamine or dimethylethanolamine, or dibutylthiourea tin, or a mixture, or a mixture of any two of them.

5. The suspension according to claim 4, characterized in that the content of catalytic additives in the range of 0.01-3 wt.% 1 kg of the suspension depends on the type of catalytic additives and the sequence of layers in the coating.



 

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2 tbl, 9 ex

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15 cl, 3 tbl, 9 ex

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24 cl, 4 tbl, 14 ex

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EFFECT: increasing up to the specified level fire resistance ratings of supporting and enveloping building structures primarily in high-rise buildings.

6 cl, 3 dwg

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