SU1249057A1 - Preparation for winter cleaning of urban and motor roads - Google Patents

Description

The invention relates to the chemical industry, in particular to reagents used in winter cleaning of urban and highways to prevent and apply snow to the road surface, as well as to reduce the freezing force of ice with asphalt concrete and cement concrete, to reduce corrosion of automotive steel.

The aim of the invention is to reduce the damaging effects on the pavement and reduce the corrosion of automotive steel while reducing the inhibitory effect on plants.

Example 1.1 t of a solution of magnesium chloride (bischofite) composition, m ac.%: MgClj 20; water and inert impurities 80 are mixed with superphosphate or disodium phosphate in a quantity of 0.6. (3% of dry matter), which is 6 kg, and a preparation is obtained containing the following composition, kg:

MgC j200

Ca () 2 or 6 Water and inert impurities 794 Example 2.1 tons of magnesium chloride (bischofite) solution of composition, wt%: MgClj 20; water and inert impurities 80 are mixed with superphosphate or disodium phosphate in an amount of 1.4%, which is 14 kg (7% of dry substance), and a preparation is prepared containing the following composition, kg: MgC j200

Ca (Hj PO or Na NRO 14 Water and inert impurities 736 Example 3. 1 t of magnesium chloride solution (bchpofit)) of composition, wt.%: MgCl 40; water and inert impurities 60 are mixed with 1.2% superphosphate or disodium phosphate, that is 12 kg (3% of dry matter) and a preparation is obtained containing the following composition, kg: MgClj. 400, CaCHjPO) or 12 Water and inert impurities 588

Example 4. 1t of a solution of magnesium chloride (bischofite) of composition,-mass%: MgClj 40; water and inert impurities 60 are mixed with superphosphate or disodium phosphate in an amount of 2.8%, which is 28 kg (8% of dry matter), and receives npetrarate containing the following composition, kg:

five

five

0

0 5

0

five

0

five

MgClj400

Ca (), or 28. Zod and inert impurities 572

Example 5.1 tons of a solution of magnesium chloride (bischofite) composition, wt.%: MgCK 30; water and inert impurities 70 are mixed with superphosphate or disodium phosphate in an amount of 1.5%, which is 15 kg (5% of dry matter), and a preparation is obtained containing the following composition, kg:

MgC, 300

Ca (H2P04) d or .. 15

Water and inert t-impurities 685

Below are the results of a study characterizing the impact of the proposed drug when in contact with the urban environment.

Corrosion of steel in solutions in the presence and absence of inhibitors is characterized by the data given in table. one.

The tests were carried out in two modes for 30 days.

The first test mode includes immersion of samples for 6 hours in solution, followed by drying in air for 18 hours daily.

The second test mode consists in wetting the samples with the test solution for 30 seconds, followed by drying for 1 hour at eight cycles daily. In tests, a 5% aqueous solution of magnesium chloride (bischofite) is used as the most corrosively aggressive and at the same time close to the actual concentration after melting of the snow-ice formations on the roads.

All tests were conducted in parallel at.

The effect on the pavement of the proposed composition is presented in table. 2

The research regime consists in alternately wetting the concrete for 9 hours and drying it for 15 hours at 20 ° C.

The effect on the green areas of the proposed composition is presented in Table. 3

The amount of phosphate additive is determined by the criterion of the corrosive effect of the reagent on automotive steel. - The study of the effect of reagents and the practice of their use give reason to believe that the corrosion activity of reagents that meets the requirements of the protection of the surrounding urban

31

environment must be within the limits of that which corresponds to the action of water. Based on this, the amount of phosphate additives for magnesium chloride is 0.6–2.8%. The increase in the amount of phosphate additives more than 2.8% increases the technological efficiency, increases the cost of the drug and leads to burns in plants. A decrease in the additive is less than 0.6% leads to an increase in corrosivity compared with water. Application of the proposed preparation for cleaning

Magnesium chloride

Magnesium chloride + superphosphate or disodium phosphate

Calcium chloride + superphosphoric magnesium

Magnesium chloride + superphosphate or disodium phosphate

HCF reagent (known)

Calcium chloride Water

490574

roads can reduce environmental impact and use a large amount of waste magnesium chloride from chemical plants, as well as natural sources of magnesium chloride (bischofite) solution for winter cleaning of urban and highways. The concentration of magnesium chloride in bischofite 10 ranges from 200 to 400 g / l, which is

defines its use as a source of magnesium chloride in the proposed preparation. Table 1

Not

358.6

194.4

35.6 32.3 29.8

21.7 19.8 16.6

425

465

465 460 450

Magnesium chloride + superphosphate or disodium phosphate (1.5%)

HCF reagent (known)

Calcium chloride

Editor P. Cossey

Compiled by R. Gerasimov

Tehred V. Kadar CorrectorM. Samborska

Order 4201/27 Circulation 644. Subscription

. VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Table 3

12.2 13.0 10.8

Claims (1)

DRUG FOR WINTER CLEANING OF URBAN. AND ROADS, containing an aqueous solution of metal chloride and a phosphate additive, characterized in that, in order to reduce the destructive effect on the road surface and reduce corrosion of automobile steel while reducing the inhibitory effect on plants, it contains magnesium chloride as metal chloride, and as a phosphate additive, superphosphate or disodium phosphate in the following ratio of components, May.%: Magnesium Chloride Superphosphate or Disodium Phosphate Water 20-40 0.6-2.8 The rest ί 1249057