Rust transformer

FIELD: paint and varnish industry.

SUBSTANCE: invention relates to rust modifying agents that use used for coating rust metallic surfaces without their preliminary cleansing from rust, among them, with mazut and oily pollutions and can be exploited in the range of temperatures from -50°C to +500°C. Proposed rust transformer comprises the following components, wt.-%: ortho-phosphoric acid, 37.0-51.0; graphite, 24.0-34.0; concrepol B, 0.3-1.2; lignosulfonates, 0.5-1.0, and water, 18-27. Invention provides enhancing effectiveness and prevention of separating into layers of the transformer for liquid and solid phase at prolonged storage.

EFFECT: improved and valuable properties of transformer.

 

The invention relates to coatings industry, namely, modifiers, rust, used to cover the rusted metal surfaces without pre-treatment from rust.

Known rust Converter, containing (wt.%) lignin - 14-16, phosphoric acid - 16-20, soap stock - 1,5-3,0, ethanolamine - 1,5-2,5, natural drying oil - 2-3 and water - leave (A.S. USSR №1595864).

The disadvantage of this Converter rust is low transformative ability, rapid separation during storage and impossible to use on rusty polluted or oily surfaces.

The closest technical solution chosen for the prototype is a rust Converter containing phosphoric acid, graphite, cadmium oxalate and lignosulfonate and water (Patent RF №2186080).

The drawback of this rust Converter is also insufficient transforming ability and education while keeping a very dense, hard mix precipitate, which increases the time and complexity of the preparatory work before its application.

The problem to which the invention is directed, is to create a drug that can effectively convert the rust in non-corrosive connection even in polluted and namaslennyh surfaces, and in which the voiding his bundle, i.e. the precipitation of the solid fraction of the drug during storage.

The technical result obtained using the proposed Converter rust, improve efficiency and prevent stratification of the drug on the liquid and solid phases during prolonged storage.

The task and the technical result is achieved by the fact that the known rust Converter in addition to orthophosphoric acid, graphite, lignosulfonate and water further comprises contraol In representing are water polymer system in the form of a Sol or gel of a polymer of N-vinylpyrrolidone, with the following proportions of ingredients (in wt.%):

phosphoric acid - 37,0-51,0

graphite - 24,0-34,0

the lignosulfonate - 0,5-1,0

contraol In - 0,3-1,1

water - 18-27.

The rust was obtained as follows. The pre-crushed in a mortar or in a laboratory mill and sieved through a sieve with the hole diameter 0.125 mm graphite brand of SCA-1 TU 21-25-166-75 mix in a measuring Cup with orthophosphoric acid brand "h" GOST 6552-80. The resulting mixture was homogenized.

In another Cup fall asleep lignosulfonate powder technical TU-13-0281-036-15-90 and dissolve them in water GOST R-98. The resulting solution of lignosulfonate pour into a glass with a mixture of graphite and phosphoric acid, after which the ingredients thoroughly is eno mix. To the mixture is added contraol IN THE 9365-001-13802623-2003 representing are water polymer system in the form of a Sol or gel of a polymer of N-vinylpyrrolidone.

The components are thoroughly mixed until complete homogenization of the finished product syrupy consistence black or black and gray with metallic luster, having a density is 1.58-1.60 g/cm3.

Example. To obtain 100 g of rust Converter in the beaker with a capacity of 200 ml asleep 30,3 g (30.3 per cent) of graphite REG THE 21-25-166-75 0.7 g (0,7%) with a particle size of not more than 0.125 mm and poured with stirring to 45.4 g (45.4%) of phosphoric acid brand "h" GOST 6552-80. The resulting mixture was homogenized.

In another Cup fall asleep 0.8 g (0,8%) of powder sodium lignosulfonates TU-13-0281-036-90, dissolve them in 23,0 g (23,0%) water GOST R-98, and then pour the resulting solution of lignosulfonate in the glass with a mixture of graphite and phosphoric acid. Then to the resulting mixture components added 0.5 g (0.5%) kanchrapara IN THE 9365-001-13802623-2003 and mix thoroughly until syrupy homogeneous mass of black or dark gray with metallic luster and density was 1.58-1.60 g/cm3.

Other compositions are prepared in the same way.

For testing was taken from a well known drug and offered.

Testing is carried out as follows. On with the real rusty plate 50× 100 mm with a thickness of rust from 200 to 250 μm brush cause is known and the proposed rust converters. On the part of the plate in advance of the brush put mineral oil or fuel oil. When applying the known Converter on these plates is rolling into balls, which at the location of the plates vertically poured from the surface. This is due to the absence in the composition of surface-active substances, whose role in the proposed composition perform lignosulfonates and contraol Century

When applying the proposed Converter rust it is mixed with oil contamination, forming due to the emulsifying component homogeneous emulsion of oil-in-water". Oil, until this adsorbed layer of rust, goes into a rust Converter, and converts the rust component composition - phosphoric acid freely interacts with rust, converting it into an inert product.

The samples coated with the rust converters dry during the day, and then use a scalpel to remove it from the surface. All plates covered with well-known Converter, rust remains, while the samples treated with the proposed Converter, it does not exist.

Strengthening the transforming ability of the proposed Converter rust due to the presence of the it two surface - active substances (surfactants): lignosulfonate and kanchrapara, the latter of which also has plasticizing properties. Penetrating deep into rust, they carry phosphoric acid, which converts not only the upper, but the lower layers of rust.

When the content of the rust Converter graphite less than 24.0% of the lowering of its viscosity, decreasing its opacity.

When the content of graphite more than 34.0% of the drug to become viscous, loses its plasticity, which makes its application to the metal surface.

When the content of the rust with phosphoric acid less 37,0% decreases its transforming ability and increases the viscosity.

When the content of phosphoric acid is more 51,0% decreases the viscosity of rust and deterioration of coverage.

When the content of the lignosulfonate less than 0.5% worsen its emulsifying properties and reduced transforming ability.

The content of the lignosulfonate more than 1.0% does not increase emulsifying properties of rust Converter, and only leads to irrational consumption.

Reducing the water content below 18,0% leads to the fact that the composition becomes hard, poorly applied to the surface, deteriorating its adhesive properties.

With increasing water content over the 27,0% increases the porosity of the coating, worse opacity of rust Converter.

The decrease in the concentration kanchrapara In less than 0.3% leads to an increase in water yield of the drug, resulting in its rapid stratification and loss of solids in the sediment.

The increase in the content kanchrapara In more than 1.1% leads to an increase in viscosity of rust Converter.

In addition to the above properties, we offer a rust Converter has inhibitory ability, i.e. it can slow down the corrosion process under normal conditions and at elevated temperatures - reducing properties. The proposed rust Converter can be operated in the temperature range from minus 50°C to + 500°s at the temperature of application is from minus 30°to + 60°C. At the operating temperature of 150-170°the proposed Converter does not require overlap of paint material, because under these conditions it happen irreversible chemical and structural changes that increase its strength.

This modifying anti-corrosion coating can be used in various fields: oil and gas, shipbuilding, agriculture, as well as in everyday life.

The rust Converter, comprising orthophosphoric acid, graphite, lignosulfonate and water, characterized in that it PPRs is niteline contains contraol, which is an aqueous polymer system in the form of a Sol or gel of a polymer of N-vinylpyrrolidone, in the following ratio of ingredients, wt.%:

Phosphoric acid37-51
Graphite24-34
Contraol0,3-1,1
Lignosulfonates0,5-1,0
Water18-27



 

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