RU2532264C2 - Cationic bitumen emulsion for anticorrosion protection of steel - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to bitumen emulsions and can be used for the anticorrosion protection of steel and in road building. A cationic bitumen emulsion for the anticorrosion protection of steel, including bitumen, emulsifier KADEM-VT, vat residue of benzene rectification, hydrochloric acid, penazoline K, additionally contains a synergic mixture of corrosion inhibitors from 5,6,7,8-tetrachloroquinozoline, diethyl-S-(6-chlorobenzoxazolinon-2-yl-3-methyl)dithiophosphate, with the following component ratio, wt %: bitumen 55-60; emulsifier KADEM-VT 2.9-4.5; vat residue of benzene rectification 10-11; hydrochloric acid 0.6-0.8; diethyl-S-(6-chlorobenzoxazolinon-2-yl-3-methyl)dithiophosphate 0.3-0.4; 5,6,7,8-tetrachloroquinozoline 0.4-0.5; penazoline K 0.4-0.9; water - the remaining part.

EFFECT: emulsion makes it possible to reduce wear of the road coating and protect the metal surface of moving transport from corrosion.

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Description

The invention relates to the field of chemistry, in particular to bitumen emulsions, and can be used for corrosion protection of steel and in road construction.

Known bitumen emulsion (see AS USSR No. 393237, 1973), which protects the steel from corrosion. However, it does not contain corrosion inhibitors.

The closest prototype to this invention can be a bitumen emulsion with enhanced physicomechanical properties (AS USSR No. 270575 (1970), which includes waste from coke production - bottoms of benzene rectification (KORB) and an aqueous solution of protein broth hydrolyzate However, this emulsion does not sufficiently protect the steel from corrosion, since it does not contain corrosion inhibitors.

The technical task is to obtain a bitumen emulsion that performs the functions of an anticorrosive agent and a cationic type building material.

The technical result is an increase in the anticorrosion properties of the emulsion, which is achieved by the fact that the emulsion additionally contains a synergistic mixture of corrosion inhibitors containing 5,6,7,8-tetrachloroquinosoline, diethyl-S- (6-chlorobenzoxazolin-2-yl-3-methyl) dithiophosphate.

The proposed emulsion of the specified composition performs two functions: anticorrosive and adhesive.

The anticorrosion properties were checked in a G-4 hydrostat, which worked in the following daily mode: for 7 hours, heating to a temperature of 50 ° C was turned on (automatic mode), the rest of the day the hydrostat was turned off, water was poured onto its pan. The plate of steel 3 measuring 10 × 5 cm was covered with emulsion; corrosion was recorded using a polyethylene film, which was divided by strokes into 100 squares (50 + 50 on each side). The corrosion rate was determined by the number of squares affected by corrosion (8%). It was also determined on which day the first corrosion spot appeared. A more traditional method was also used: a special solution was prepared by successively dissolving in water all the components that make up the emulsion. Corrosion in the prepared solution occurred with oxygen depolarization, the insoluble products of which were then removed by etching in sulfuric acid containing a strong inhibitor (catapine). From the decrease in mass of the test steel sample, the drag coefficient was determined. Since such a method is much simpler, most of the experiments were performed using this technique. Thus, in principle, corrosion could be quantified both in% and in weight units, but the second method is preferable.

To increase the anti-corrosion ability, it was possible to select a synergistic pair of additives, a quinoline derivative (corrosion inhibition coefficient K _T = 2.9) and organic thiophosphate (1.9), i.e. rather weak inhibitors, giving, however, a significant synergistic effect. It also turned out to be expedient to introduce Penazoline K _T into the emulsion to enhance adhesion between the surface of the mineral material and the emulsion (and possibly other useful properties of asphalt).

Additive structures are as follows.

Quinoline derivative (5,6,7,8-tetrachloroquinosoline):

Organic thiophosphate (diethyl-8- (6-chlorobenzoxazolinone-2yl-3methyl) dithiophosphate:

Penazolin (a mixture of imidazolines with an admixture of aminoamides with a C ₂₁ alkyl radical).

If the thiophosphate and quinoline derivative would enhance the inhibitory effect additively, i.e. according to the rules of addition, the total coefficient of inhibition of corrosion would be 2.9 + 1.9 = 4.8. In fact, it is much higher, which indicates a mutual strengthening of the protective properties of inhibitors by the type of synergism.

To evaluate the adhesive action, the emulsion layer deposited on the gravel by immersing the gravel sample in bitumen was tested for integrity after 30 minutes exposure in low boiling water. For cationic emulsions, it is allowed if at the same time no more than 5% of the coating area is destroyed.

The proposed emulsion was obtained in 2 stages.

At the first stage, a mixture of all components of the emulsion was taken, except bitumen and waste - the residue of benzene rectification, dissolved in water in a paddle mixer at a temperature of 50-60 ° C, at a speed of 60-100 rpm, for 2.5 hours, maintaining the volume of water is constant.

At the second stage, waste was added to the mixture - the bottom residue of benzene rectification, a knife dispersant was used, operating at a speed of 250 revolutions per minute, the duration of operation was 15 minutes. Then bitumen heated to 120 ° C was added in a thin stream and stirring was continued for another 15 minutes. The prepared emulsion was stored in a closed container.

Example 1 preparation of the emulsion

The emulsion contained (wt.%):

bitumen 57 emulsifier KADEM-VT 3.8 benzene distillation residue 10.5 hydrochloric acid 0.6 quinoline derivative 0.4 organic thiophosphate 0.3 penazoline K 0.4 water rest

Corrosion Inhibition Ratio 29th Adhesive loss 5% (normal)

The results obtained satisfy the requirements and standards.

Example 2 preparation of the emulsion

The emulsion contained (wt.%):

bitumen 60 emulsifier KADEM-VT 4,5 benzene distillation residue eleven hydrochloric acid 0.8 quinoline derivative 0.5 organic thiophosphate 0.4 penazoline K 0.6 water rest

Corrosion Inhibition Ratio 38 Adhesive loss 3%

Example 3 preparation of the emulsion

The emulsion contained (wt.%):

bitumen 58 emulsifier KADEM-VT 2.9 benzene distillation residue 10 hydrochloric acid 0.5 quinoline derivative 0.3 organic thiophosphate 0.3 penazoline K 0.9 water rest

Corrosion inhibition coefficient 45 Adhesive loss 2.4%

The finished emulsion contains the following components (wt.%):

bitumen 55-60 emulsifier KADEM-VT 2.9-4.5 distillation residue of benzene distillation 10-11 hydrochloric acid 0.6-0.8

(diethyl-S- (6-chlorobenzoxazolinone-2-

il-3-methyl) dithiophosphate 0.3-0.4 5,6,7,8-tetrachloroquinosoline 0.4-0.5 penozalin K 0.4-0.9 water rest

The positive effect is the superiority of the proposed emulsion in stability and anticorrosive action. The emulsion can reduce the wear of the road surface and protect the metal surface of a moving vehicle from corrosion.

Claims (1)

Cationic bitumen emulsion for anticorrosive protection of steel, including bitumen, KADEM-VT emulsifier, distillation residue of benzene rectification, hydrochloric acid, Penazolin K, characterized in that it additionally contains a synergistic mixture of corrosion inhibitors from 5,6,7,8-tetrachlorochinosoline, diethyl -S- (6-chlorobenzoxazolinon-2-yl-3-methyl) dithiophosphate in the following ratio, wt.%:
bitumen 55-60 emulsifier KADEM-VT 2.9-4.5 distillation residue of benzene distillation 10-11 hydrochloric acid 0.6-0.8
(diethyl-S- (6-chlorobenzoxazolinone-2yl-
3-methyl) dithiophosphate 0.3-0.4 5,6,7,8-tetrachloroquinosoline 0.4-0.5 penazoline K 0.4-0.9 water rest