The deicing composition of an aqueous solution for surface treatment of roads

 

(57) Abstract:

Use: for surface treatment of roads from winter slipperiness (snow forward, ice). The composition contains, wt%: calcium chloride 20-30, urea 2-5, corrosion inhibitor (polyaniline or polyvinilpirolidone chlorides or a mixture thereof) 0,02-0,04, water - the rest. The technical result is a good melting properties at low temperature crystallization (up to minus 50C), reduce corrosion, the composition is not adversely merge on the environment. table 1.

The invention relates to the production of anti-icing composition of an aqueous solution for surface treatment of roads from winter slipperiness (snow forward, ice, ice slick on the roads and streets in cities and towns.

A method of obtaining anti-icer - anti-icing composition used for the elimination of snow and ice formations.with. USSR N 272462, 1970). The composition contains calcium chloride or its mixture with sodium chloride, in which for the purpose of preventing corrosion of metals injected sodium nitrite calcium in the amount of 2-40%.

The composition obtained as a crystalline salt of a complex technology: evaporated until a certain concentration is atratum. In addition, the use of such composition on the roads has a negative impact on the plants growing along the roads.

The closest analogue of the present invention is a de-icing agent (U.S. patent N 4094805, 1978) containing calcium chloride and/or sodium chloride, and/or urea and 0.01-100% polymer of ethylene oxide (policed). This reagent is proposed for use before you freeze water on concrete and asphalt roads to prevent their destruction. The disadvantage of this reagent are not sufficiently low freezing temperature (not lower than -23oC).

The present invention is to obtain affordable cheap stock with good melting properties at low temperature crystallization, the composition having a low degree of corrosion, do not have a negative impact on the environment, the composition of which may be used after freezing the water on the roads.

The task is solved in that the deicing composition of an aqueous solution for surface treatment of roads includes calcium chloride, urea, and further comprises a corrosion inhibitor for metal surfaces from a number of Quaternary non ratio of components wt. %:

Calcium chloride - 20-30

Urea - 2-5

Corrosion inhibitor - 0,02-0,04

Water - the Rest

The choice of the optimal concentration of the parameters of the deicing composition shown in the table.

The choice of the concentration of calcium chloride (20-30%) is associated with temperature conditions during processing: less than 20% does not allow processing at temperatures below -15oC, and more than 30% is meaningless, because this temperature can be achieved within the concentration of calcium chloride 20-30%.

The table shows that the addition of corrosion inhibitor reduces the freezing point of the solution (cf. N 1 and 2), reduces the corrosion of metals (cf. N 4 and N 5-7).

The choice of the limit values of concentration of corrosion inhibitor (0,02-0,04%) related to the efficiency of its impact on metal: concentration of 0.01 is still insufficient, and the use of concentration more than 0.04 loses all meaning, because the corrosion rate varies slightly (N 5-7).

Assessment fetotoksicheskoe action on plants was conducted on the germination of seeds at the initial stage of their development that made it possible to assess the degree of influence on the development of seeds within a reasonable range of influence of urea.

Pokeman (cfand (cf, %) to control. Control seeds were parsevals distilled water and was duplicated in two replications (cfthe control sample was 86.42 mm). We selected a limit on the concentration of urea 2-5% (N 9-11).

The product is a 20-30% aqueous solution of calcium chloride with 2-5% urea and 0.02-0.04% of polyaniline and polyvinilpirolidone chloride or mixtures thereof.

The tests have shown that this product meets the requirements for de-icing solutions for surface treatment of roads.

The deicing composition of an aqueous solution for surface treatment of roads, including calcium chloride and urea, characterized in that it further contains a corrosion inhibitor for metal surfaces from a number of Quaternary ammonium compounds, such as polyaniline or polyvinilpirolidone chloride or mixtures thereof, in the following ratio, wt.%:

Calcium chloride - 20 - 30

Urea - 2 - 5

Corrosion inhibitor - 0,02 - 0,04

Water - The Rest

 

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EFFECT: improved and valuable properties of reagent.

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2 cl, 3 tbl, 3 ex, 1 dwg

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