RU2478119C1 - Liquid detergent for cleaning rolled metal products - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: liquid detergent for cleaning rolled metal products contains caustic soda, calcined soda, Trilon B, Plurafac LF-431, monoethanolamine oleate and water, with the following ratio of components, wt %: caustic soda 16-20; calcined soda 8-16; Trilon B 1-3; Plurafac LF-431 0.2-0.4; monoethanolamine oleate 0.2-0.3; water - the balance.

EFFECT: obtaining an environmentally friendly detergent which does not contain phosphates, has high detergent power at low temperatures and anticorrosion properties.

1 cl, 2 tbl

Description

The invention relates to compositions of detergents and can be used in metallurgy for cleaning metal.

Known compositions for cleaning metal, representing bulk powders (RU 2239651 C1 and RU 2289614 C1).

But at present, for the safety and convenience of use, liquid detergents are in demand at steel mills.

Liquid detergent composition is described in patent RU 2277582 C1 (option 2) and has the following composition:

Caustic soda (in terms of dry matter) 30-40 Trisodium phosphate 8-10 Graham Salt 4-10 Berl LFJ 61 0.5-1 / 0 Water up to 100

But this composition has the following disadvantages:

- insufficient environmental friendliness due to the presence in the composition of components containing environmentally harmful phosphates, which, when released into water bodies, contribute to the increased formation of blue-green algae, the decomposition of which releases methane, ammonia and hydrogen sulfide, which has a detrimental effect on the habitat of water bodies;

- insufficient washing ability in the low temperature range of 50-55 °;

- lack of anti-corrosion properties.

The objective of the invention is the creation of an environmentally friendly detergent that does not contain phosphates, with high detergency in the low temperature range of 50-55 ° C and anticorrosion properties.

This object is achieved in that the detergent contains caustic soda, soda ash, Trilon B, Plurafac LF-431, monoethanolamine oleate and water in the following ratio of components:

Caustic soda 16-20 Soda ash 8-16 Trilon B 1-3 Plurafac LF-431 0.2-0.4 Monoethanolamine Oleate 0.2-0.3 Water Rest

The proposed detergent was obtained by introducing components into the reactor in the following sequence: the calculated amount of water was poured into the reactor-mixer and caustic soda and calcined soda were calculated. After the components were completely dissolved, Trilon B was added, then after cooling the mixture, Plurafac LF-431 and monoethanolamine oleate were added.

The detergent does not contain phosphates, which are very harmful to the environment. The detergent ability of the product in the low temperature range is achieved through the introduction of other components, such as caustic soda, Trilon B and Plurafac LF-431.

Corrosion resistance is achieved through the introduction of Trilon B and monoethanolamine oleate.

Soda ash in combination with caustic soda significantly increases the washing ability.

Trilon B softens water, which also contributes to an increase in washing ability and is also a good anti-corrosion component.

Monoethanolamine oleate, introduced even in small amounts, gives the detergent anti-corrosion properties.

Plurafac LF-431 surfactant is a surfactant with an alkoxyl end group, is stable in an alkaline environment and works well even at low washing temperatures.

For testing in laboratory conditions, three compositions of the claimed agent were prepared (1, 2, 3) and the composition of the prototype (4). The compositions are shown in table 1.

Table 1 Name of components Content, wt.% one 2 3 four Caustic soda 16 eighteen twenty 35 Soda ash 8 12 16 - Trisodium Phosphate - - - 9 Graham Salt - - - 7 Berl LFJ 61 - - - 0.75 Trilon B one 2 3 - Plurafac LF-431 0.2 0.3 0.4 - Monoethanolamine Oleate 0.2 0.25 0.3 -

In laboratory tests, the detergency (degree of purification) of the compositions and the anticorrosive ability were determined.

The degree of purification was determined by the formula:

where P ₀ is the initial mass of the sample, g;

P ₁ - the mass of the sample with contamination, g;

P ₂ - the mass of the sample after purification,

The anticorrosive ability was judged by the appearance of the cleaned plates, which were not washed with water after degreasing, put into a pack of 5 plates and examined the appearance in a day. There should be no rust on the plates.

The tests were performed on galvanized plates with a size of 150 × 70 mm. The plates were cleaned at a temperature of 55 ° C in the compositions shown in table 1 for 3 seconds.

The test results are shown in table 2.

table 2 Compositions Washing ability Anticorrosive ability one 96 possesses 2 98 possesses 3 96 possesses four 88 does not possess

From table 2 it can be seen that the use of the proposed detergent provides high washing ability and anti-corrosion properties.

Literature

1. Patent RU 2289614 C1 "Technical detergent".

2. Patent RU 2239651 C1 "Detergent for cleaning a metal surface."

3. Patent RU 2227582 C1 "Composition for obtaining technical detergent for cleaning a metal surface."

Claims (1)

A liquid detergent for cleaning rolled metal containing caustic soda and water, characterized in that it additionally contains components such as soda ash, Trilon B, Plurafac LF-431 and monoethanolamine oleate in the following ratio, wt.%:
Caustic soda 16-20 Soda ash 8-16 Trilon B 1-3 Plurafac LF-431 0.2-0.4 Monoethanolamine Oleate 0.2-0.3 Water Rest