RU2507246C1 - Detergent for defatting flat cold-rolled black plate in rolls - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: described is a detergent containing sodium hydroxide - 3.3-5.4 g/l, sodium carbonate - 5.6-9.3 g/l, sodium tripolyphosphate - 1.4-2.3 g/l, dry and liquid hydrophobic plasticising additive (sodium methyl siliconate) - 0.09-0.4 g/l, antifoaming additive - 0.015-0.025 g/l, trisodium phosphate - 0.9-1.5 g/l, nonionic surfactants (mixture of monoalkylphenyl esters of polyethylene glycol based on primary fatty alcohols and monoalkylphenyl ester of polyethylene glycol based on a polymer distillate 1:1) -1.2-1.8 g/l, sodium silicate - 2.8-4.2 g/l, silica hydrosol with ratio [SiO₂]:[Na₂O]≥40 - 0.4-0.6 g/l, water - up to 1 litre, wherein the weight ratio of the silica hydrosol to sodium silicate and to the mixture of nonionic surfactants is equal to 1:7:3.

EFFECT: high degree of cleaning flat cold-rolled black plate owing to high detergent power of the composition.

1 cl, 2 tbl

Description

The invention relates to detergent compositions and can be used in metallurgy for degreasing and preventing inter-turn weldability of cold-rolled black sheet in rolls during high-temperature annealing in pack furnaces.

Known detergent (RU 2134719 08.01.98) for cleaning a metal surface containing components, g / l:

Sodium hydroxide 6.44-11.04 Sodium carbonate 5.74-9.84 Sodium metasilicate 0.42-0.72 Oxyethylated Monononylphenol based on propylene trimers containing in a molecule 12 mol of ethylene oxide 0,084-0,144 Oxyethylated Monononylphenol based on propylene trimers containing in a molecule 9 mol of ethylene oxide 0.056-0.096 Sodium Tripolyphosphate 1.26-2.16 Water The rest is up to 1 liter.

This detergent degreases cold rolled black sheet quite well at a temperature of 70-85 ° C and a degreasing time of 6-8 s, but does not prevent inter-turn weldability during heat treatment.

Closest to the invention for its intended purpose and the achieved result is a detergent (RU 2443769) containing the following ratio of components, g / l:

Sodium hydroxide 4-6 Sodium Tripolyphosphate 2-2.5 Sodium carbonate 5-8 Oxyethylated Monononylphenol based on propylene trimers containing in a molecule 12 mol of ethylene oxide 0.2-0.35 Antifoam additive 0.002-0.003 Silicic acid salts 1-2 Hydrophobic Plasticizing Additive 2-4 Water The rest is up to 1 liter.

The detergent has good non-stick properties, but the washing ability when processing cold-rolled black sheet is low, and the inability to prepare it with a loose homogeneous powder with a good presentation is also a disadvantage.

The objective of the invention is to develop a detergent with high washing ability, which helps to prevent interturn weldability of cold-rolled black sheet during high-temperature processing and to obtain a homogeneous free-flowing powder with a good presentation.

This object is achieved in that the detergent containing sodium hydroxide, sodium carbonate, sodium tripolyphosphate, a dry or liquid hydrophobic-plasticizing additive (sodium methylsiliconate), an antifoam additive, additionally contains trisodium phosphate, nonionic surfactants (a mixture of polyethylene glycol monoalkylphenyl ethers primary fatty alcohols and monoalkylphenyl ether of polyethylene glycol based on polymer distillate 1: 1), sodium silicate, silica hydrosol with the ratio [SiO ₂ ]: [Na ₂ O] ≥40 in the following ratio of components, g / l:

Sodium hydroxide 3.3-5.4 Sodium carbonate 5,6-9,3 Sodium Tripolyphosphate 1.4-2.3 Hydrophobic plasticizing agent (methyl sodium silicate) 0.09-0.4 Defoaming agent. additive 0.015-0.025 Trisodium phosphate 0.9-1.5 Nonionic Surfactants (mixture of monoalkylphenyl ethers of polyethylene glycol based on primary fatty alcohols and polyethylene glycol monoalkylphenyl ether based on polymer distillate 1: 1) 1.2-1.8 Sodium silicate 2.8-4.2 Silica hydrosol with ratio [SiQ ₂ ]: [Na ₂ , O] ≥40 0.4-0.6 Water up to 1 liter

Moreover, the mass ratio of silica hydrosol to sodium silicate and to a mixture of nonionic surfactants is 1: 7: 3.

The claimed ratio of components allows the detergent:

- provide high degreasing ability;

- during high-temperature annealing in bell-type furnaces, to prevent inter-turn weldability of cold-rolled black sheet;

- get a homogeneous bulk powder with a good presentation.

For the study, 5 detergent compositions were taken with a different ratio of components and the composition of the known.

The compositions of the proposed detergent was prepared by dissolving in warm water (30-40 ° C) for 5-7 minutes, the estimated amount of the finished powder.

The composition of the known product was prepared by dissolving in water (temperature 30-40 ° C) the components of the composition for 10-15 minutes.

The compositions of the known and proposed detergent are shown in table 1.

The compositions of the proposed and known detergent were tested for detergency. The determination was carried out by the gravimetric method, which is based on determining the percentage of washability of contaminants from the surface of a metal sample.

The tests were carried out on samples of cold-rolled black sheet 50 × 100 mm in size (the area of the treated surface was 1 dm ² ).

In laboratory conditions, the processes of chemical and electrochemical degreasing of the surface of cold-rolled black sheet were simulated. Scheme of sequential processing of each sample:

- weighing on an analytical balance;

- chemical or electrochemical treatment in a detergent solution without the use of brushes. In chemical treatment, the degreasing time is 8 s at a temperature of 80-85 ° C, during electrochemical cathodic treatment, the degreasing time is 6 s at a temperature of 70-80 ° C and a current density of 10 A / dm ² ;

- flushing with hot water;

- drying with filter paper;

- weighing on an analytical balance;

- removal of residual contamination by wiping samples with alcohol;

- weighing on an analytical balance.

The amount of residual and initial contamination was determined by the difference in mass of the samples before and after treatment with alcohol, and the detergency was determined. The test results are shown in table No. 2.

To determine the non-stick properties, samples of cold-rolled black sheet after processing in washing solutions were subjected to high-temperature annealing (650 ° C) in a bell furnace.

As can be seen from the examples (see table 2, pr. 2, 3, 4), the content within the claimed limits provides high washing ability and prevents the interturn weldability (sticking) of cold-rolled black sheet during high-temperature annealing in a bell furnace, makes it possible to prepare a homogeneous free-flowing powder with a good presentation.

Changing the content of the components below the declared limits (see table 2, pr. 1) leads to a decrease in washing ability, and above (see table 2, pr. 5) makes the powder moist with a poor presentation. In both cases, it adversely affects the quality of the detergent.

Example 6 describes the properties of the prototype. As can be seen from the example, the detergent has good non-stick properties, but the washing ability is low and it is impossible to prepare it with a homogeneous loose powder with a good presentation.

The use of the proposed detergent provides the following technical and economic advantages.

1. A high degree of degreasing of cold-rolled black sheet due to the high washing ability of the composition.

2. Reducing the cost of the process of degreasing and high-temperature processing of cold-rolled black sheet, by reducing the percentage of rejects from the weldability of metal.

3. Technological application (ease of preparation and adjustment of the working bath).

This invention is successfully used for degreasing and

prevention of inter-turn weldability of cold-rolled black sheet on aggregates AEO-1, AEO-2 LPC-Z of OJSC MMK and has the Foscon 219 trademark.

Table 1 No. p.p. Components The content in the composition, g / l one 2 3 four 5 6 * one Sodium hydroxide 2.6 4.3 5.4 6.2 5.5 2 Sodium carbonate 4,5 5,6 7.5 9.3 10.7 6.0 3 Sodium Tripolyphosphate 1,1 1.4 1.9 2,3 2.7 2.0 four Dry or liquid hydrophobic-plasticizing additive (sodium methylsiliconate) 0.06 0.9 0.26 0.4 0.5 2,5 5 Antifoam additive 0.012 0.015 0,020 0,025 0,028 0.002 6 Sodium phosphate trisubstituted 0.6 0.9 1,2 1,5 1.7 - 7 Nonionic surfactants (a mixture of monoalkylphenyl ethers of polyethylene glycol based on primary fatty alcohols and
polyethylene glycol monoalkylphenyl ether based on polymeric distillate 1: 1) 0.9 1,2 1,5 1.8 2.1 - 8 Sodium silicate 2.1 2,8 3,5 4.2 4.8 - 9 Silica hydrosol with the ratio of [SiO ₂ ]: [Na ₂ O] ≥40 0.3 0.4 0.5 0.6 0.7 - 10 Oxyethylated monoalkylphenol based on propylene trimers containing 12 mol of ethylene oxide in a molecule - - - - - 0.25 eleven Silicic acid salts (sodium pyrosilicate: sodium disilicate - 1: 1) - - - - - 2.0 12 Water Up to 1 liter Up to 1 liter Up to 1 liter Up to 1 liter Up to 1 liter Up to 1 liter 13 The mass ratio of silica hydrosol to sodium silicate and to a mixture of nonionic surfactants 1: 7: 3 1: 7: 3 1: 7: 3 1: 7: 3 1: 7: 3 -

Literature

1. RF patent 2134719 "Detergent for cleaning a metal surface."

2. RF patent 2443769 "Detergent for degreasing rolled metal", (prototype).

Claims (1)

Detergent for degreasing and preventing inter-turn weldability of cold-rolled black sheet during high-temperature treatment, containing sodium hydroxide, sodium carbonate, sodium tripolyphosphate, dry or liquid hydrophobic-plasticizing additive (sodium methylsiliconate), an antifoam additive, additionally contains trisodium phosphate-nonionic a mixture of monoalkylphenyl ethers of polyethylene glycol based on primary fatty alcohols and monoalkylphenyl ethers of polyethylene glycol based f polymeric distillate 1: 1), sodium silicate, silica hydrosol with a ratio of [SiO ₂ ]: [Na ₂ O] ≥40 in the following ratio of components, g / l:
Sodium hydroxide 3.3-5.4 Sodium carbonate 5,6-9,3 Sodium Tripolyphosphate 1.4-2.3 Dry or liquid hydrophobic plasticizing additive (sodium methylsiliconate) 0.09-0.4 Antifoam additive 0.015-0.025 Trisodium phosphate 0.9-1.5 Nonionic Surfactants (mixture of monoalkylphenyl ethers of polyethylene glycol based on primary fatty alcohols and polyethylene glycol monoalkylphenyl ether based on polymer distillate 1: 1) 1.2-1.8 Sodium silicate 2.8-4.2 Silica hydrosol with ratio [SiO ₂ ]: [Na ₂ O] ≥40 0.4-0.6 Water up to 1 liter
moreover, the mass ratio of silica hydrosol to sodium silicate and to a mixture of nonionic surfactants is: 1: 7: 3.