RU2280666C1 - Agent preventing ice-crusted pavement conditions - Google Patents

Abstract

FIELD: road maintenance.

SUBSTANCE: invention is designed for use in municipal economy area to remove snow-and-ice covers on pavements and sidewalks. Antiicing agent is an aqueous solution with 30 to 100% of a chemical, namely alkali caprolactam production effluent including 25-45% dry solids, 18-30% organic acid sodium salts (calculated as sodium adipate), 0.7-0.8% cyclohexanol, 8-10% resin, and water (in balancing amount), pH of solution being 10-13.

EFFECT: increased ice thawing efficiency, reduced corrosion activity, lowered freezing point, and disposed production waste.

1 tbl

Description

The anti-icing agent on the road surface refers to the winter maintenance means for road surfaces and can be used in public utilities, in particular, to remove snow and ice cover on roads and sidewalks.

Known anti-icing composition, including brine, a by-product of the production of potash fertilizers and sodium aluminate, respectively 98.0-99.0 and 1.0-2.0 wt.% [1].

The presence of two components in the specified composition increases its cost, since additional equipment is required for transportation, storage and mixing of the components. The need to remove loosened snow-ice formation by mechanical means also leads to a higher cost of the process of removing snow-ice formations from road surfaces.

Known anti-icing drug "Kama", including in wt. %: potassium chloride 45-50, crystallization water and inert impurities 1-5. This preparation is obtained by mixing these components and pressing the resulting mixture with a specific pressure of 100-200 MPa, followed by crushing the tiles into crumbs with a size of 0.1-10 mm [2].

The disadvantages of the known drug is the multicomponent and high energy consumption of its production, which leads to high cost and complicates its practical use. The presence of potassium and sodium chlorides in the preparation, which are highly aggressive to concrete, leads to its rapid destruction. In addition, the drug exhibits a melting ability with respect to ice under conditions of negative ambient temperatures only up to -10 ° C.

Known tool for dealing with icy and slippery of the road surface, which is used as the acetate containing a by-product of the production of polymethylmethylene ether glycol (PTMEG), including wt. %:

In solid form - crystallohydrad:

Sodium Acetate 57-59 Water insoluble residue 0.2-0.7 Water rest

In liquid form with a pH of 8-10:

Sodium Acetate 25-32 Sodium Chloride 2-5 Water rest

With the consumption of both forms of 12-15 kg per 1000 m ² calculated on anhydrous sodium acetate. [3].

The advantage of this method is the use of a by-product of the industrial process, however, the limited distribution of PTMEG leads to a limitation of the use of this tool. The presence of sodium chloride in PTMEG will have a corrosive effect on vehicles. In the description of the invention there is no data on the temperature conditions of the tests.

The closest technical solution to the proposed is an anti-icing agent in the form of scrap refractory masonry apparatus titanium-magnesium production [4].

Scrap of the refractory masonry of titanium-magnesium production apparatus is fireclay chips, on the surface and in the pores of which chloride salts are contained.

The indicated agent has low melting efficiency of the snow-ice cover due to the insignificant content of the melting component in the product — sodium chloride (about 3%) and the presence of solid ballast — fireclay chips, which prevents the interaction of ice with chloride and hydrochloride salts.

In addition, the silicate base of the product, being an inert material, causes dust formation and environmental pollution. The presence of a small amount of titanium-magnesium production limits the use of this tool.

The objective of the proposed technical solution is to create anti-icing products with high efficiency of melting ice, low corrosivity and freezing temperature.

The problem is solved by the use of anti-icing agents on the road surface by applying an aqueous solution with a concentration of 30-100% of a chemical substance to the coating, while the alkaline runoff of caprolactam production (SCSPK), including wt.%, Is used as a chemical substance:

Dry matter 25-45 Sodium Organic acids (in terms of sodium adipate) 18-30 Cyclohexanol 0.7-0.8 Cyclohexanone 0.1-0.2 Resin 8-10 Water Rest solution pH 10-13.

By the degree of impact on the body, SCHSPK belongs to substances of the 4th hazard class and can be used without restrictions when processing road surfaces.

When using an aqueous solution with a concentration of 30-100% SCHPAS, the snow-ice cover melts at temperatures from 0 ° C to -25 ° C due to a decrease in the freezing temperature of the mixture in which there are complex alkalis with a pH of 10-13. The freezing temperature of ShchSPK is below -30 ° C.

For experimental verification used ShchSPK ZAO Kuibyshev Azot containing the following components, wt. %: dry matter 28.4 (including NaOH 1.6 and sodium adipate 26.8), sodium salts of organic acids (in terms of sodium adipate) 27, cyclohexanol 0.8, cyclohexanone 0.2, resin 8, water - the rest with pH = 13 and a density of 1.1 h / cm ³ .

The corrosive effect of ShchSPK on motor vehicles was checked by keeping fragments cut from various parts and parts of AvtoVAZ vehicles in a 100% ShchSPK solution. Exposure was carried out for 5, 15 and 30 days, followed by drying of the fragments in air. The tests were carried out at 20 ± 3 ° C. The effect of alkali porcine sulphate complex on fragments was evaluated by a change in their weight and visually in appearance. The data obtained are shown in the table below.

Conditions Name of a fragment of a car From part, part From material the tire Door bottom Disc (Al Alloy) Bumper plastic Plastic molding sealant The weight of the fragment before exposure to SCHSPK, 96.5 45.8 45.1 113.0 31.1 20.3 24.6 Fragment weight after aging, g. After: 5 days 96.5 45.8 45.1 113.0 31.1 20.3 24.5 15 days 96.5 45.6 45.1 113.0 31,4 20.3 24.5 30 days 96.5 45.5 45.1 113.0 31.5 20.3 24.5

The test results showed that ShchSPK practically has no corrosive effect on any parts and materials of vehicles. Slight peeling of paint was noted in fragments of doors in places exposed to cutting tools.

The melting ability of SHCHSPK was determined in the area with an ice formation 10 cm thick. Ice processing was carried out at temperatures of –12 ° С, –17 ° С and –25 ° С with 100 and 50% SHCHSPK solution with water at the rate of 0.2 l / m ² . After 3 days, the ice thickness decreased by 2.0, 2.0 and 1.5 cm, respectively.

The proposed composition is environmentally friendly, as it relates to substances of hazard class 4, is corrosion-inactive in relation to car parts and can be used without restrictions when processing road surfaces.

The proposed substance is a by-product of the industrial process, which allows rational use of production waste, eliminating the cost of waste disposal and the production of the chemical used in the method of preventing slippage of road surfaces.

Information sources

1. Copyright St. USSR No. 1666506, class S 09 K 3/18, 07/30/1991.

2. RF patent No. 2044118, 09/20/1995.

3. RF patent No. 2178035, cl. S 09 K 3/18, 01/10/2002.

4. Copyright certificate. USSR No. 1323636, cl. E 01 H 10/00, 07/15/1987.

Claims (1)

The anti-icing agent on the road surface by applying to the coating an aqueous solution with a concentration of 30-100% of a chemical substance, while an alkaline stock of caprolactam production is used as a chemical substance, including, wt.%: Dry matter 25-45 Sodium salts of organic acids (in terms of sodium adipate) 18-30 Cyclohexanol 0.7-0.8 Cyclohexanone 0.1-0.2 Resin 8-10 Water Rest at a solution pH of 10-13.