Anticorrosive composition

 

(57) Abstract:

Coating composition for protecting metal structures, pipes welded seams. The composition contains as a plasticizer of the polyurethane foam in combination with carbon filler and binder. This provides good adhesion to the surface of 3.1 MPa, high density and strength (tensile strength 312 kg/cm2), stability in water and corrosive fluids and heat. table 1.

The invention relates to the field of inorganic chemistry and relates to compositions used in the corrosion protection of metal structures, pipes, welds, tanks for technical water, heating systems, etc.

Known carbon-containing composition including powdered carbon black or graphite, binder is a polyurethane obtained by the reaction of a complex of the polyester with the monofunctional isocyanate, blocked multifunctional isocyanate and solvent [1].

The disadvantages of the known compositions are the complexity of the preparation due to the complexities of composition, low physical and mechanical characteristics of the resulting coating, and the complexity of its application, because it requires demolisten composition to obtain a multilayer coating on concrete products, consisting of a primer based on an aqueous emulsion of a mixture containing 58.8 to 90,9 wt. %, binder, such as epoxy resin, and 9.1 - 41,2 wt.% graphite [2].

The disadvantages of the known composition are necessary to pre-prepare the surface by cleaning and priming, as well as low mechanical and corrosion properties of the obtained coatings.

Known adhesive to obtain a corrosion-resistant products containing 7-10 wt. % graphite, 22-31 wt.% a binder, such as epoxy resin, 28-46% wt.% liquid rubber with a curing agent [3].

The disadvantages of the known adhesives are complex technology of its application because of the need for subsequent curing, as well as the impossibility of using it for cover, as he has poor ductility and low physical-mechanical characteristics.

Also known anticorrosive composition for coating with good flexibility and chemical resistance to protect pipelines containing epoxy resin (binder), coal tar (plasticizer), the solvent and the carbon filler (graphite) [4].

The disadvantage of this composition is the complexity and difficulty sonetos. This coating composition is less chemo - and heat-resistant, which leads to the reduction of physical-mechanical or corrosion properties.

The objective of the invention is to create a simple composition and method of application to protect the surface, simultaneously with high physical-mechanical and corrosion properties of the composition.

This problem is solved due to the fact that well-known anti-corrosion composition comprising a binder, a plasticizer, a carbon filler, plasticizer use polyurethane foam, in the following ratio, wt.%:

The carbon filler - 10-50

Plasticizer - 2-5

Binding - Rest

As a carbon filler take graphite specified structure, and dispersion or mixtures thereof with technical carbon or calcined coke.

As a binder take various resins, such as phenol-formaldehyde, polyester; varnishes, for example, bakelite; adhesives, for example penopolimermineralnaya.

As the plasticizer-use polyurethane polyurethane Wild 17 (TU 6-05-221-937-87), which is based on polyoxypropylene based on complex polyester P6-BA, 1,4-butandiol and 4,4'-diphenylmethanediisocyanate. As the plasticizer-foam using foam stamps PES-3 (TU 6-6-05-1806-77), which is produced from polyethylene compositions brand 108-P and foam stamps PES-ST (THE 6-05-321-821-85), which is produced on the basis of polyethylene foam bespreking brand 108-578 BP.

The invention consists in that the proposed qualitative and quantitative compositions are more simple in composition composition, which has good adhesion to the surface, high density, stability in water and corrosive environments, as well as heat resistance.

In addition, the proposed arrangement does not require complicated preparation of the surface, sufficient mechanical cleaning, dries in 15-20 minutes, apply any standard method and can be cooked and used even in the field.

Example 1. 50 l mixer brand BF 3 downloaded 23.3 kg (up to 66.5 wt.%) binding glue marks BF 2 (GOST 12172-74), 10.5 kg (30 wt.%) the carbon filler is graphite (GOST 10274-79) and 1.2 kg (3.5%) plasticizer-polyurethane Wild 17. Then stirred without heating for 30-40 min, and then unloaded.

what AV.

The test results of the coatings obtained from the known and proposed composition shown in the table.

As can be seen from the table, when the increase and decrease of the content of graphite beyond the selected interval, the strength of the coating and adhesion to the surface begin to fall, especially with the reduction of the content of graphite. The coating in this case becomes less moisture and corrosion resistant.

Significantly these figures due to the change in the content of the plasticizer (less than 2 wt.% and more than 5 wt.%): the resistance decreases in 2 times, and corrosion resistance by 25%.

In the case of use as a filler mixture of graphite with other carbon materials (carbon black, calcined coke) physico-mechanical properties of the coatings remain quite high.

Replacement glue BF 2 on bakelite varnish or epoxy resin does not degrade the quality of coatings.

Thus, the compositions can be obtained by a simple coating technology with high physical-mechanical and corrosion properties.

Coating composition comprising a binder, a plasticizer, a carbon filler, characterized in that>/BR>The carbon filler - 10 - 50

The plasticizer is 2 - 5

Binder - Ostalnoe

 

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