Preparation for winter cleaning highways and urban roads

 

The invention relates to the chemical industry, namely to the drugs used to prevent and remove smiledand covers on the roads. The product has the following composition, wt.%: sodium chloride 97,5-98,5, disubstituted phosphates of alkali metals - the rest. The technical result - the reduction of corrosion activity of the drug while reducing inhibitory action on plants. 3 table.

The invention relates to the chemical industry, namely to medicines, in particular for the prevention and removal of neinleganan covers on the roads.

A well-known drug for the removal neinleganan covers on the basis of chlorides of alkali and alkaline earth metals containing as phosphate inhibiting additives dihydroorotate alkaline earth metals in the following ratio, wt.%: Chlorides of alkali and alkaline earth metals - 20-98 Dihydroorotate alkaline earth metal, and 0.1 - 12 Water and inert impurities (CaS4, SrSCO4) - The rest (and.with.482488, MKI.2 09 K 3/18, Appl.26.11.71, publ.25.09.76, B. I. 35) (1).

The disadvantage of the drug is its high corrosiveness against metals. So, with the rhenium of dihydroorotate alkaline earth metals compared with the chlorides of the metals (table. I) the beginning of the corrosion from the ingress of chlorides on the metal surface takes place before the formation of a passivating film formed through the use of inhibitory phosphate additives.

In addition, due to the very low solubility of dihydroorotate calcium (table. II) introduction to the drug has no significant effect on the reduction of inhibitory action of the chlorides of the metals on plants (chemist's Handbook 2 hours, Izd-vo "Chemistry", L., 1965, page 146) (3).

In the case of using the liquid preparation (example 3) due to the additional amount of water formed from melting ice, the concentration of the inhibitor will decrease to the point where its protective function practically ceases to operate. As shown by laboratory studies, when the concentration of the phosphate additive in the mixture is lower than 0.8%, the corrosion process is active, i.e. not enough inhibitor for passivating a metallic surface.

Well-known drug for winter cleaning highways and urban roads, containing an aqueous solution of metal chloride and phosphate additive, characterized in that as the chloride of the metal it contains magnesium chloride, and as a phosphate additive - superphosphate or centripetal the next time soothes the class. 4 09 K 3/18, Appl. 07.08.84, publ. 07.08.86, B. I. 29) (2).

The disadvantage of the drug is relatively high corrosional activity to metal surfaces auto and electric.

Like all metal chlorides, magnesium chloride is an activator of corrosion of metal surfaces of cars and electric vehicles, and unlike sodium chloride, falling on a metal surface, forms crystals, which starts the corrosion process. In addition, when using an aqueous solution is more dilute and reduce the concentration of phosphate additives in a mixture of ice and salt. When the content of phosphate additives in a mixture of 0.8% or below, its inhibitory effect stops (PL.III).

The disadvantage of using aqueous solutions is also the fact that the viscosity of such solutions at temperatures belowoWith two to three times higher than at 25-30oIn terms of solution preparation. If you get solution to clean the ice and snow of the road coating is formed slick "film", resulting in deteriorating the adhesion with the road surface (Corrosion under the action of coolants, refrigerants and working phone Chemistry, L., 1988, S. 302-304) (4).

As a prototype us the plants is reduced corrosive activity of the drug while reducing inhibitory action on plants.

The solution of this problem is achieved by the fact that the product containing the metal chloride and phosphate additive in solid form, contains as phosphate additives disubstituted phosphates of alkali metals in the following ratio, wt.%: Sodium chloride - 97,5-99,2
Disubstituted phosphates of alkali metals - Rest
The essence of the invention consists in the following. When using disubstituted phosphates of alkali metals (dinatriumfosfaatti, discalificata or mixtures thereof in the ratio 1:1) passivation of metal surfaces immediately after contact with them selenophosphate ice mixture, because the dissolution rate of dinatriumfosfaatti and discalificata higher than that of sodium chloride (table.I). This leads to reduced corrosion activity of the drug. Solution hit on near - road lawn allows for the use of dinatriumfosfaatti to support the content of mobile forms of phosphorus on an average level, and the application of discalificata incorporated into the soil is another useful component (potassium), which ultimately reduces the dampening effect on plants of de-icing agent based on sodium chloride.

Tests, corrosion was carried out by standard Metodicheskie components close to the real after melting of snow and ice formations on the roads (on the basis of consumption norms - 150 g of the drug per 1 m2the road surface). The sample was immersed in the prepared solution for 6 hours, then removed and dried for 18 hours. The test was conducted 30 days.

The second mode of testing consisted of wetting the samples solution for 30 sec, followed by drying (1 hour), when eight cycles per day. All tests were conducted in parallel at t=203oC.

In addition, when conducting industrial experiment at the prospect of the Glory of the Moscow district of St. Petersburg on the road surface near the border were installed metal shields-probes in the control and experimental plots, which after 3 months of testing were evaluated for susceptibility to corrosion.

The material composition of the samples was studied using energy spectrometer LINK AN 10000/S85 (UK) combined with SEM. As shown by the research results, when used as a corrosion inhibitor DCP and/or TNF decreases the thickness of the oxidized film (iron oxide) on metal surfaces by 40-50%. Inhibitor does piscivorous role, slowing down the corrosion process.

Example 1. 1 t solution of magnesium chloride (bischofite) composition, wt.%: MgCl2- 30, substances), and get the drug, the next composition, kg: MgCl2- 300; Na2NRA4- 15; water and inert impurities - 685.

Example 2. 1 ton of a mixture of chlorides of alkaline-earth and alkali metal composition, weight. %: CaCl2- 40; NaCl - 50; water - 10, mixed with 70 kg of double superphosphate, containing dihydroorotase of calcium in the number of 55.3 kg Receive the solid product of the following composition in weight. %: CaCl2- 37; NaCl - 47; Ca(H2RHO4)2- 5, water and impurities - the rest.

Example 3. 1 t technical sodium chloride (TPS) is mixed with denitrification (DNF) in an amount of 0.2%, which is 2 kg, and get the product containing the following composition in weight. % of: salt - 99,8; DNF - 0,2.

Example 4. 1 t technical sodium chloride (TPS) is mixed with denitrification in the amount of 0.5%, which is 5 kg, and get the product of the following composition in weight. % technical sodium chloride (TPS) - 99,5; DNF 0.5 in.

Example 5. 1 t technical sodium chloride (TPS) is mixed with 0.8% of dinatriumfosfaatti that is 8 kg, and get the product of the following composition in weight. % technical salt - 99,2 and TNF - 0,8.

Example 6. 1 t technical sodium chloride (TPS) is mixed with 1.5% dinatriumfosfaatti that is 15 kg, and get the product of the following composition in weight. % who scored 25 kg, and get the product of the following composition in weight. %: TPS - 97,5 and DP to 2.5.

Example 8. 1 t technical sodium chloride (TPS) is mixed with 3.5% dinatriumfosfaatti, which is 35 kg, and get the product of the following composition in weight. %: TPS - 96,5 and TNF - 3,5.

Example 9. 1 t technical sodium chloride (TPS) is mixed with 1% of dinatriumfosfaatti and 1% discalificata (DCP), representing, respectively, 10 kg, and get the product of the following composition in weight. %: TPS - 98; DP - 1 and DCP - 1.

Example 10. 1 t technical sodium chloride (TPS) is mixed with 0.8% of discalificata that is 8 kg, and get the product of the following composition in weight. %: TPS - 99,2 and DCP - 0,8.

Example 11. 1 t technical sodium chloride (TPS) is mixed with 1.5% discalificata that is 15 kg, and get the product of the following composition in weight. %: TPS - 98,5 and DCP - 1,5.

Example 12. 1 t technical sodium chloride (TPS) is mixed with 2.5 discalificata that is 25 kg, and get the product of the following composition in weight. %: TPS - 97,5 and DCP - 2,5.

The results of the experiments are presented in table.III.

The table presents the results of investigations and tests confirm indications that the use of solid mixtures is preferable to use aqueous solutions, because it saves the expense fosfat the same 0,8% significantly reduces its effect on the metal surface and increases the surface corrosion.

With increasing phosphate content of the additive higher than 2.5% increases the cost of the drug, but the speed passivation is not increased because the amount of inhibitor sufficient to cover the metal surface of the phosphate film.

The use of discalificata improves quality impacts of phosphate additives as passivator (because potassium is itself an inhibitor, and in connection with phosphate increases the inhibitory activity) and reduce the suppressive action of chlorine on plants when you hit it in the soil of lawns, because potassium in mobile form is a useful component that enhances the growth and growth of plants, shrubs and trees.

The use of dinatriumfosfaatti and, especially, Dikili-phosphate with alkaline pH close to neutral (8-10), in comparison with mononatriumfosfaatti, double superphosphate, trisodium phosphate, with or acidic, or roscomalosco environment that allows sewage waste waters have a pH corresponding to the maximum allowable set of sue "Vodokanal".


Claims

Preparation for winter cleaning highways and urban roads, containing a solid mixture of metal chloride and phosphate inhibiting additives, characterized t is Oseni components, wt.%:
Sodium chloride - 97,5-98,5
Disubstituted phosphates of alkali metals - Ostalnoe

 

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