The rust converter

 

(57) Abstract:

The invention relates to coatings industry, namely modifiers rust, which are used for coating metal surfaces without pre-treatment from rust, including those of oil and oil contamination. We offer the product contains phosphoric acid, graphite, lignosulfonate and water. These components taken in the following ratio, wt.%: phosphoric acid 38-50, graphite 25-33, lignosulfonates 0,5-1,0, water the rest. In addition to the ability to convert the rust, covered with fat and oil stains, rust Converter has inhibitory ability, i.e. the ability to inhibit 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 30 to 500°C at the temperature of application is from minus 30 to 60°C. When the operating temperature of 150-170°With the proposed Converter does not require overlap of paint material, because under these conditions it happen irreversible chemical and structural changes in the sector: gas, petroleum, shipbuilding, agriculture, etc., 1 table.

The invention relates to coatings industry, namely, modifiers, rust, used for coating metal surfaces without pre-treatment of the products from rust, including oil and oil pollution.

Known modifier rust, containing, wt.%: lignin 14-16, phosphoric acid 16-20, soap stock from 1.5 to 3.0, ethanolamine 1.5 to 2.5, natural linseed oil 2-3 and water the rest (ed. St. USSR N 1595864, C 09 D 5/12, Modifier rust" Appl. 15.06.88. Publ. 30.09.90, BI N 36).

The disadvantage of this Converter rust is the inability to apply on polluted or oily surfaces.

The closest technical solution, selected as a prototype, is the modifier rust, containing phosphoric acid, kaolin, graphite and water Color on rust-79. Abstracts of the third all-Union scientific-technical seminar. Bitter, 1979, S. 45-46).

The disadvantage of this modifier rust is the inability to use samosatenus and greasy rusty metal surfaces.

The challenge cat is Ernesta, including oily and polluted.

The technical result obtained using the proposed Converter rust - can be used as usual rusty metal surfaces, and contaminated or oily surfaces without prior removal of these contaminants.

The task and the technical result is achieved by the fact that the known rust Converter, in addition to phosphoric acid, graphite and water, additionally contains lignosulfonates with the following ratio of ingredients, wt.%:

Phosphoric acid - 38-50

Graphite - 25-33

The lignosulfonate - 0,5 - 1,0

Water - the Rest

Comparative analysis of the prototype allows us to conclude that the claimed composition of rust Converter differs from the known introduction of lignosulfonates. Thus, the proposed solution meets the criterion of "novelty".

The technical result obtained when using the rust Converter containing phosphoric acid, graphite, lignosulfonate and water, allows to solve the existing industrial problem - the possibility of its application on samosatenus and simultaneoulsy level."

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 marks THE GSS 21-25-166-75 poured into the beaker, into which is poured with simultaneous mixing orthophosphoric acid brand "h" GOST 6552. The resulting mixture was homogenized.

In another glass, poured the powdered lignosulfonate TU technical-13-0281-036-15-90 and dissolve them in water GOST 2874. The resulting solution of lignosulfonate pour into a glass with a mixture of graphite and phosphoric acid. After the ingredients are thoroughly mixed until syrupy homogeneous mass of dark gray with metallic luster, having a density of 1,585-1,590 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 with a particle size of not more than 0.125 mm and poured under stirring at 45.9 g (45,9%) orthophosphoric acid brand "h" GOST 6552. 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 g (23%) water GOST 2874, and then poured tion is stirred until syrupy homogeneous mass of dark gray with metallic luster and density 1,585-1,590 g/cm3.

Other compositions are prepared in the same way.

For testing, the results of which are presented in the table were taken from well-known drug and offer.

Testing is carried out as follows. On a rusty steel plate size 50 x 100 mm with a thickness of rust to 150 μm brush applied petroleum oil, mineral oil (engine), the fuel oil. These materials put such quantity that the location of the plates vertically in some time on their surfaces begin to form stains. On the thus prepared plate is circular and translational motion with pressure applied known and proposed rust converters.

When applying the known rust on the plates are formed balls, which poured from the surface, leaving the oily and greasy surfaces of the plates. This is due to the absence in the composition of surface-active substances, whose role in the proposed composition perform lignosulfonates. Therefore, as can be seen from the table, for the well-known rust is not characteristic parameters such as adhesion, opacity, transforming ability.

When the content of the rust Converter graphite less than 25% is lowering its viscosity and when applying it spreads over the surface, decreasing its opacity.

When the content of the rust with phosphoric acid less than 38% decrease of its transforming ability and flexibility.

When the content of phosphoric acid is more than 50% decreases the viscosity of rust and deterioration of its coverage.

When the content of the lignosulfonate less than 0.5% worsen its emulsifying properties.

The content of the lignosulfonate more than 1% does not increase emulsifying properties of rust Converter, and only leads to irrational consumption.

The reduction in content is raised to its adhesive properties.

If you increase the water content of more than 25%, this leads to an increase in porosity of the coating and reduce the opacity.

In addition to the ability to convert the rust, covered with fat and oil stains, rust has inhibitory ability, i.e. the ability to inhibit 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 30 to 500oC at the temperature of application is from minus 30 to 60oC. When the operating temperature of 150-170oC the proposed Converter does not require overlap of paint material, because under these conditions it happen irreversible chemical and structural changes that increase strength.

This rust Converter can be applied in various sectors of the economy: oil and gas, shipbuilding, agriculture, etc.

The rust Converter, comprising orthophosphoric acid, water and graphite, characterized in that the rust Converter contains lignosulfonates in the following ratio of components, ve

 

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2 tbl, 16 ex

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cl, tbl, 2 ex

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