RU2458977C1 - Industrial detergent for electrochemical degreasing - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: industrial detergent contains the following in wt %: 30-40 caustic soda, 8-10 trisodium phosphate, 17-20 sodium tripolyphosphate, 0.5-1.0 composition of an anionic and nonionic surfactant with an additive of antifoaming agent Sulphoxide 61, 2-4 trilon B, 5-6 phosphorous acid, 5-6 sodium hexafluorosilicate, 2-3 sodium salt of carboxymethyl cellulose, calcined soda - up to 100.

EFFECT: preventing fusability of plates in rolls and high detergent power, low residual dirt.

1 cl, 1 tbl

Description

The invention relates to technical detergents for electrochemical degreasing and can be used in metallurgy at high-speed units in the production of electrotinning tin bell annealing.

Known compositions of electrochemical degreasing, consisting of the following components: caustic soda, sodium carbonate, trisodium phosphate, metasilicate and syntanol DS-10 (S. Ya. Griliches "Degreasing, etching and polishing of metals").

The cleaning time in these solutions is 1-10 minutes, and on high-speed units, the cleaning time is 1-6 seconds.

The closest analogue to the proposed technical detergent is a technical detergent for cleaning a metal surface described in patent RU 2277582 C1 (dry version), containing caustic soda, trisodium phosphate, sodium polyphosphate - Graham salt, a mixture of nonionic surfactants Berol LF Ji 61 , soda ash in the following ratio, wt.%:

Caustic soda - 30-40 Trisodium phosphate - 8-10 Sodium Tripolyphosphate - 4-10 BerolLFJ 61 - 0.5-1.0 Soda ash up to 100.

The described technical tool can be used on high-speed units and provides a high degree of purification of sheet metal, but when it is used in the production of electrofinished sheet metal of bell annealing, there are such disadvantages as welding of sheet metal in rolls and insufficient washing ability (high residual contamination after annealing) .

In the production of electric tinplate, to give increased plastic properties of tin, a high-temperature (up to 650 ° C) stepwise annealing mode in bell furnaces is used, in which it is possible to weld tin in rolls at a high annealing temperature. In addition, soot spots may be observed after the rolls exit the bell furnace. In order to prevent possible welding of tin in rolls at a high annealing temperature and to improve the washing ability (lowering the rate of residual pollution), a technical detergent containing caustic soda, trisodium phosphate, sodium tripolyphosphate, anionic and nonionic surfactant composition with the addition of antifoam Sulfoside 61, soda ash is proposed , Trilon B, phosphorous acid, sodium hexafluorosilicate and sodium salt of carboxyl methyl cellulose in the following ratio, wt.%:

Caustic soda - 30-40 Trisodium phosphate - 8-10 Sodium Tripolyphosphate - 17-20 Sulfoside 61 - 0.5-1.0 Trilon B - 2-4 Phosphoric acid - 5-6 Sodium Hexafluorosilicate - 5-6 Sodium salt of carboxyl- methyl cellulose - 2-3 Soda ash up to 100.

The detergent further contains detergent enhancing components such as Trilon B and phosphorous acid.

The detergent additionally contains components that prevent the welding of tin in rolls, such as sodium hexafluorosilicate and sodium carboxylmethyl cellulose.

Detergent as a surfactant contains a composition of anionic and nonionic surfactants with the addition of antifoam Sulfoside 61 (TU 2484-143-05744685-95).

The essence of the invention

In the reactor-mixer prepared 3 composition (1, 2, 3) of the proposed technical detergent and the composition of the prototype (4).

Composition 1. In the reactor-mixer, the components were loaded with stirring in the following sequence: 305 kg of soda ash, 80 kg of trisodium phosphate, 170 kg of sodium tripolyphosphate, 20 kg of trilon B, 50 kg of phosphorous acid, 50 kg of sodium hexafluorosilicate and 20 kg of sodium salt of carboxyl methyl cellulose. Then, after thoroughly mixing all the components, 5 kg of sulfoside 61 are added by spraying and 300 kg of caustic soda at the end of mixing.

Composition 2. In the reactor-mixer, the components were loaded with stirring in the following sequence: 252.5 kg of soda ash, 90 kg of trisodium phosphate, 185 kg of sodium tripolyphosphate, 30 kg of trilon B, 55 kg of phosphorous acid, 55 kg of sodium hexafluorosilicate and 25 kg of sodium salt carboxyl methyl cellulose. Then, after thoroughly mixing all the components, 7.5 kg of sulfoside 61 are added by spraying and 300 kg of caustic soda at the end of mixing.

Composition 3. The components were loaded into the reactor-mixer with stirring in the following sequence: 110 kg of soda ash, 100 kg of trisodium phosphate, 200 kg of sodium tripolyphosphate, 30 kg of trilon B, 60 kg of phosphorous acid, 60 kg of sodium hexafluorosilicate and 30 kg of sodium salt of carboxyl methylcellulose. Then, after thoroughly mixing all the components, 10 kg of sulfoside 61 are added by spraying and 400 kg of caustic soda at the end of mixing.

Composition 4. According to the prototype. The components were loaded into the reactor-mixer with stirring in the following sequence: 390 kg of soda ash, 100 kg of trisodium phosphate, 100 kg of sodium tripolyphosphate. Then, after thoroughly mixing all the components, 10 kg of Berol LF Gi is added by spraying and 400 kg of caustic soda at the end of mixing.

Hot rolled tinplate in batches of 12 rolls after pickling and rolling on a cold rolling mill was degreased in an electrolytic degreasing line at a current density of 10 A / dm ³ for 3 seconds at a temperature of 70-80 ° C alternately in prepared detergent compositions at a concentration of 20 g / l After degreasing, recrystallization annealing of the coiled tin was carried out in a bell furnace at a temperature of 650 ° C in accordance with the technical process for the production of tinplate.

The results of the quality of tin after annealing when using the described compositions are shown in table 1.

The table shows that the proposed technical detergent when used for the production of tinplate allows:

- prevent welding of tin in rolls;

- increase the washing ability (reduce the indicator of residual pollution after annealing).

Literature

1. Patent RU 2277582 C1 “Composition for obtaining technical detergent for cleaning a metal surface”.

2. Griliches S.Ya. “Degreasing, pickling and polishing of metals” Edited by P.M. Vycheslavov. - Ed. 5th, rev. and add. L .: Engineering, Leningrad. Department, 1989-101 p., ill. - (B-galvanic engineering; Issue 1). Page 41.

Claims (1)

Technical detergent for electrochemical degreasing on high-speed units during the production of cap tin annealed tinplate, containing soda ash, trisodium phosphate, sodium tripolyphosphate, anionic and nonionic surfactant composition with the addition of antifoam Sulfoside 61, which is characterized by the fact that it prevents the deteriorating ability to increase the cooking ability the rolls additionally contains trilon B, phosphorous acid, sodium hexafluorosilicate and sodium carboxyl methyl cellulose When the following component ratio, wt.%:
Caustic soda 30-40 Trisodium phosphate 8-10 Sodium Tripolyphosphate 17-20 Sulfoside 61 0.5-1.0 Trilon B 2-4 Phosphoric acid 5-6 Sodium Hexafluorosilicate 5-6 Sodium salt of carboxyl- methyl cellulose 2-3 Soda ash Up to 100