RU2539601C1 - Detergent for metal surface cleaning - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention refers to detergents and aims at degreasing cold-rolled metal in rapid metal working units before applying various types of coatings. What is described is a detergent for the metal surface cleaning containing sodium hydroxide, sodium carbonate, a composition of non-ionic oxyethylated products free from alkylphenol ethoxylates, a mixture of polyoxyethylated esters of monoethanolamides of synthetic fatty acids of a C10-C16 fraction, additionally contains trisodium salt of nitrilotriacetic acid and an antifoaming agent in the following proportions, g/l: sodium hydroxide - 4.07-20.35, sodium carbonate - 5.50-27.50, a composition of non-ionic oxyethylated products free from alkylphenol ethoxylates - 0.05-0.25, a mixture of polyoxyethylated esters of monoethanolamides of synthetic fatty acids of a C10-C16 fraction - 0.05-0.25, trisodium salt of nitrilotriacetic acid - 0.30-1.50, antifoaming agent - 0.03-0.15, water the rest to 1 l.

EFFECT: high degree of the metal surface cleaning, low consumption of the agent, and reduced production costs.

1 tbl, 3 ex

Description

The invention relates to detergents and is intended for degreasing cold rolled metal on the units of high-speed continuous processing of metal before applying various types of coatings.

Known detergent for cleaning a metal surface containing components,%:

Oxyethylated octylphenol benzyl ester 5 Sodium hydroxide thirty Sodium carbonate thirty Sodium Metasilicate (5H ₂ O) 35

("Surface phenomena and surfactants". Handbook, 1984, p. 349).

Having a satisfactory washing ability, the composition has disadvantages. The large amount of sodium metasilicate forms a passive film on the metal surface, which subsequently negatively affects the formation of various coatings, which in turn leads to a deterioration in the quality of coatings.

The closest to the invention in technical essence and the achieved result is a detergent (RU 2134719, 08.01.98), which contains the following components, g / l:

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

The disadvantages of this detergent are: low washing ability with high-speed processing from 3 to 10 s, high foaming, which makes it impossible to use it on high-speed (3-10 s) continuous metal processing units, the content of complex phosphates that adversely affect the environment , from the point of view of ecology, which are the main cause of the esterification of surface waters.

The objective of the invention is to develop a detergent with high detergency, low foaming when degreasing cold rolled metal on high-speed units (3-10 s) continuous metal processing by chemical, electrochemical, chemical-mechanical method and the production of which do not use phosphates that adversely affect the environment .

This object is achieved in that the detergent containing sodium hydroxide, sodium carbonate, a composition of nonionic hydroxyethylated products that do not contain alkyl phenol ethoxylates, a mixture of polyoxyethylated esters of monoethanolamides of synthetic fatty acids of fraction C10-C16, additionally contains a trisodium salt of nitrilotriacetic acid and an anti-foaming agent g / l:

Sodium hydroxide 4.07-20.35 Sodium carbonate 5.50-27.50 The composition of nonionic hydroxyethylated products not containing alkyl phenol ethoxylates 0.05-0.25 A mixture of polyoxyethylenated esters synthetic fatty monoethanolamides acids of fraction C10-C16 0.05-0.25 Trisodium salt of nitrilotriacetic acid 0.30-1.50 Antifoam additive 0.03-0.15 Water The rest is up to 1 liter

The claimed ratio of components allows the detergent:

- to provide high washing ability of cold rolled metal;

- be used on the units of high-speed continuous processing of cold-rolled metal before applying various types of coatings in a chemical, electrochemical, chemical-mechanical way;

- not have an additional negative impact on the environment due to the lack of complex phosphates in its composition.

The effectiveness and stability of cleaning with a detergent is maintained during the accumulation of a significant amount of contaminants.

The essence of the invention is illustrated by the following examples:

Example 1

The detergent composition is prepared by sequentially dissolving in warm water (35-40 ° C) for 15-20 minutes with constant stirring of the following components, g / l:

Sodium hydroxide 4.07 Sodium carbonate 5.50 The composition of nonionic hydroxyethylated products not containing alkyl phenol ethoxylates 0.05 A mixture of polyoxyethylenated esters

synthetic fatty acid monoethanolamides

fractions C10-C16 0.05 Trisodium salt of nitrilotriacetic acid 0.30 Antifoam additive 0,03 Water The rest is up to 1 liter

Example 2

The detergent composition is prepared by sequentially dissolving in warm water (35-40 ° C) for 15-20 minutes with constant stirring of the following components, g / l:

Sodium hydroxide 20.35 Sodium carbonate 27,50 The composition of nonionic hydroxyethylated products, no alkyl phenol ethoxylates 0.25 A mixture of polyoxyethylated ethers monoethanol amides of synthetic fatty acids fraction C10-C16 0.25 Trisodium salt of nitrilotriacetic acid 1,50 Antifoam additive 0.15 Water The rest is up to 1 liter

Example 3

The detergent composition is prepared by sequentially dissolving in warm water (35-40 ° C) for 15-20 minutes with constant stirring of the following components, g / l:

Sodium hydroxide 12.21 Sodium carbonate 16.50 The composition of nonionic hydroxyethylated products not containing alkyl phenol ethoxylates 0.15 A mixture of polyoxyethylated ethers monoethanol amides of synthetic fatty acids fraction C10-C16 0.15 Trisodium salt of nitrilotriacetic acid 0.90 Antifoam additive 0.09 Water The rest is up to 1 liter

The composition of the prototype is prepared by sequential dissolution in warm water (35-40 ° C) for 15-20 minutes with constant stirring of the following components, g / l:

Sodium hydroxide 11.04 Sodium carbonate 9.84 Sodium metasilicate 0.72 Oxyethylated Monononylphenol Based trimers of propylene containing 12 mol in the molecule ethylene oxide 0.144 Oxyethylated Monononylphenol Based trimers of propylene containing 9 mol in a molecule ethylene oxide 0,096 Sodium Tripolyphosphate 2.16 Water The rest is up to 1 liter

The foaming ability of the compositions is checked as follows: in a standard cylinder of 250 cm ³ pour 100 cm ^{3 of} detergent heated to a temperature of 70 ° C, close with a ground stopper and shake 20 times. After 30 s, measure the height of the initial foam in cm.

The washing ability is determined in a weighted manner, which is based on determining the percentage of removal of contaminants from the surface of a metal sample.

Test procedure

The tests are carried out on samples of cold-rolled metal with a size of 150 × 75 mm. Samples are thoroughly degreased twice with gasoline or white spirit, dried for 20 minutes in air, brought to a constant temperature in a desiccator and weighed. The weighing result is recorded to the fourth decimal place.

Pure samples are contaminated with I 20 industrial oil, immersed in a vessel with oil, and suspended for 24 hours to remove excess oil.

Then the samples are weighed. The weighing result is recorded to the fourth decimal place.

Next, the samples are degreased with brushes for 3-5 s in a detergent composition pre-heated to 80 ° C, washed with brushes under a tap of water at a temperature of 60-65 ° C for 7-10 s and dried in an oven at temperature of 100-110 ° C. The samples are cooled first in air, then in a desiccator to a constant temperature and weighed. The weighing result is recorded to the fourth decimal place.

The washing ability to remove pollution from the metal surface, in percent, is determined by the formula:

, $$\frac{A-B}{A-C}\mathrm{one\; hundred}$$

,

where A is the mass of the sample contaminated with oil, g;

In - the mass of the sample fat-free in the detergent composition, g;

C is the mass of the sample after degreasing with gasoline or white spirit, g.

The results of determining the indicators of foaming and washing ability are shown in table 1.

Table 1 Option No. The mass of the sample fried with oil (A), g The mass of the sample, fat-free in the detergent composition (B), g The mass of the sample, defatted with gasoline or white spirit (C), g Washing ability,% Foaming ability, cm one 17.38124 17,37812 17.37809 99.05 1,2 2 06/17/391 17.05954 17.05951 99.32 1.25 3 17.25116 17,24873 17,24871 99.18 1.3 prototype 17,66800 17,66510 17,66445 81.69 3,5

Literature

1. "Surface phenomena and surfactants." Handbook, 1984, p. 349.

2. RU 2134719, 01/08/98.

Claims (1)

Detergent for cleaning a metal surface containing sodium hydroxide, sodium carbonate, a composition of nonionic hydroxyethylated products that do not contain alkyl phenol ethoxylates, a mixture of polyoxyethylene ethers of synthetic fatty acids monoethanolamides of fraction C10-C16, additionally contains a trisodium salt of nitrilotriacetic acid and an antifoaming agent with the following antifoaming agent with the following l:
Sodium hydroxide 4.07-20.3 5 Sodium carbonate 5.50-27.50 The composition of nonionic hydroxyethylated products not containing alkyl phenol ethoxylates 0.05-0.25 A mixture of polyoxyethylenated esters synthetic fatty acid monoethanolamides fractions C10-C16 0.05-0.25 Trisodium salt of nitrilotriacetic acid 0.30-1.50 Antifoam additive 0.03-0.15 Water The rest is up to 1 liter