RU2245359C2 - Detergent for metal surface - Google Patents

Abstract

FIELD: detergent composition for metallurgy.

SUBSTANCE: claimed composition contains (g/l): sodium hydroxide 6.05-12.05; sodium carbonate 5.25-10.75; sodium silicate 0.27-0.47; sodium tripolyphosphate 1.20-2.70; propylene trimer-based oxyethylated monoalkyl phenol containing 12 mol of ethylene oxide in molecule 0.073-0.158; propylene trimer-based oxyethylated monoalkyl phenol containing 6 mol of ethylene oxide in molecule 0.054-0.106; antifoaming agent 0.011-0.023; and balance to 1 l: water, wherein mass ratio of surfactant mixture to antifoaming agent is 11.5:1. Composition of present invention is useful in degreasing of rolled metal in rolls at high velocity (20-30 s) continuous treatment before coating (zinc plating, insulated coating, etc.) and affords the ability to provide metal surface of high purity.

EFFECT: detergent with reduced foaming useful for pretreatment of anizotropic electric steel.

2 tbl, 6 ex

Description

The invention relates to compositions of detergents and can be used in metallurgy for degreasing metal in rolls on continuous processing units before applying various types of coatings (electrical insulating, phosphate, etc.).

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

Oxyethylated octylphenol 5 benzyl ester

Sodium hydroxide 30

Sodium Carbonate 30

Sodium Metasilicate (5 N 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 has a negative effect on the formation of various coatings, which, in turn, leads to a deterioration in the quality of coatings.

Closest to the invention for its intended purpose and the achieved result is a detergent (RU 2134719, 08.01.98), containing the following ratio of components in 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.

Using this tool in the form of an aqueous solution at a temperature of 65-80 ° C and a degreasing time of 25-30 s can provide a good degree of cleaning of the metal surface during high-speed metal processing.

The disadvantage of this tool is high foaming, which makes it impossible to use it in high-speed metal processing units and leads to increased material consumption.

The objective of the invention is to develop a detergent with high detergency, low foaming when processing metal on high-speed, continuous processing units, and when used, there is no negative impact on the subsequent formation of coatings, in particular, electrical insulation coatings, with good quality indicators.

This object is achieved in that a detergent containing sodium hydroxide, sodium silicate, sodium carbonate, sodium tripolyphosphate, ethoxylated monoalkylphenol based on propylene trimers containing 12 moles of ethylene oxide in the molecule, ethoxylated monoalkylphenol based on propylene trimers containing 6 moles of oxide ethylene additionally contains PK-3 antifoam, with the following ratio of components, g / l:

Sodium hydroxide 6.05-12.05

Sodium Carbonate 5.25-10.75

Sodium Silicate 0.27-0.47

Sodium tripolyphosphate 1.20-2.70

Oxyethylated Monoalkylphenol

based on propylene trimers containing

in a molecule of 12 moles of ethylene oxide 0.073-0.158

Oxyethylated Monoalkylphenol

based on propylene trimers containing

in a molecule of 6 moles of ethylene oxide 0.054-0.106

Anti-foaming agent PK-3 0.011-0.023

Water the rest is up to 1 liter.

Moreover, the mass ratio of a mixture of ethoxylated monoalkylphenol based on propylene trimers containing 12 moles of ethylene oxide in a molecule and ethoxylated monoalkylphenol based on propylene trimers containing 6 moles of ethylene oxide in a molecule of PK-3 antifoam is 11.5: 1.

The claimed ratio of components allows you to provide detergent:

- high washing ability;

- use on high-speed metal processing units, as detergent working solutions have low foaming;

- use before applying electrical insulation coating.

The effectiveness and stability of cleaning with a washing solution is maintained when a significant amount of contamination is accumulated.

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

The detergent compositions were prepared by sequentially dissolving in warm water (35-40 ° C) for 15-20 minutes the estimated number of ingredients.

After their complete dissolution, the composition was pumped into a working bath.

The composition of the known funds was prepared in a similar manner.

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

The compositions of the proposed and known detergents were tested for foaming ability. The essence of the determination was that 100 cm ^{3 of} solution was poured into a standard cylinder of 250 cm ³ , closed with a stopper and shaken 20 times. After 15 s, the initial foam height was measured in centimeters. The determination was carried out at a temperature of 60 ° C.

The quality of cleaning was evaluated by the results of removal of industrial oil contaminants from the metal surface, i.e. by the washing ability of the solution.

The tests were carried out on samples of sheet anisotropic electrical steel with a size of 150 × 70 mm.

Samples were thoroughly wiped 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 was recorded to the fourth decimal place.

Pure samples were contaminated with brand 20 industrial oil by dipping in an oil vessel, then suspended for 24 hours to remove excess oil.

Then the samples were weighed. The result of weighing in grams was recorded to the fourth decimal place.

Weighted steel samples were kept for 30 s at a temperature of 60-65 ° C in the compositions of the proposed and well-known detergents, using a 20-fold immersion in a solution. After the lapse of time, fat-free samples were washed under a stream of tap water with a temperature of 15-20 ° C for 0.5 min. After allowing excess water to drain, the samples were placed for several seconds in a vessel with ethanol and dried in an oven at a temperature of 100-110 ° С. The samples were first cooled in air and then in a desiccator to a constant temperature and weighed. The weighing results were recorded to the fourth decimal place.

The washing ability in% was determined by the formula:

,

,

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

B is the mass of the sample treated in the washing solution, g;

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

To determine the quality indicators of the electrical insulating coating, the samples of anisotropic electrical steel sheet were degreased in the compositions (see table 1 pr.1-6) at a temperature of 60-65 ° C for 10-15 s, washed with warm water for 10-15 s and processed in electrical insulation composition for 5 s at a temperature of 20-40 ° C. Excess electrical insulation composition was removed by squeezing with gummed rolls. The coatings were heat treated at a temperature of 800 ° C for 60 s.

The quality of the electrical insulation coating was determined by the following indicators.

Physico-mechanical properties - bending strength. Bending of samples on a cylindrical mandrel with a diameter of 3 mm.

Specific losses during magnetic induction of 1.7 T and a frequency of 50 Hz (P _{1.7 / 50} ) were determined according to GOST 12119-80.

The results of determining the indicators of foaming, washing ability and quality of the insulating coating are shown in table 2.

As can be seen from the examples (see table 2 pr.2, 3, 4), the content of sodium hydroxide, sodium carbonate, sodium silicate, sodium tripolyphosphate, ethoxylated monoalkylphenol based on propylene trimers containing 12 moles of ethylene oxide in the molecule, ethoxylated monoalkylphenol based trimers of propylene containing 6 moles of ethylene oxide in the molecule, antifoam agent PK-3 within the claimed limits, provides low foaming of the working solution, high washing ability and makes it possible to obtain further electrical insulation a coating with good physical, mechanical and magnetic properties.

A change in the content of components above or below the declared limits (see table 2 pr.1, 5) leads in one case to a decrease in washing ability, and in another to high foaming of the solution and in both cases negatively affects the quality of the electrical insulation coating (low physical mechanical properties and high specific magnetic losses).

Example 6 characterizes the properties of the prototype and coatings obtained after preliminary processing in this composition.

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

1. A high degree of cleaning of the metal surface due to the high washing ability of the composition.

2. Low consumption of funds, because detergent does not carry away with the foam.

3. Reducing production costs (manufacturability in the preparation and adjustment of the working bath) and increasing the operating time of the solution.

4. The possibility of using it in pre-treatment of anisotropic electrical steel.

Table number 1 No. p.p. Components The content in the composition, g / l 1 2 3 4 5 6 * 1. Sodium hydroxide 4.90 6.05 9.05 12.05 13,2 11.04 2. Sodium carbonate 4,55 5.25 8.0 10.75 11.65 9.84 3. Sodium silicate 0.19 0.27 0.37 0.47 0.56 - 4. Sodium Tripolyphosphate 1.06 1.20 1.95 2.70 3.0 2.16 5. Oxyethylated monoalkylphenol based on propylene trimers containing 12 moles of ethylene oxide in a molecule 0,062 0,073 0.116 0.158 0.175 - 6. Oxyethylated monoalkylphenol based on propylene trimers containing 6 moles of ethylene oxide in a molecule 0,042 0,054 0.08 0.106 0.124 - 7. Anti-foaming agent PK-3 0.009 0.011 0.017 0,023 0,026 - 8. Ethoxylated monononylphenol based on propylene trimers containing 12 mol of ethylene oxide in a molecule - - - - - 0.144 9. Oxyethylated monononylphenol based on propylene trimers containing 9 mol of ethylene oxide in a molecule - - - - - 0,096 10. Sodium metasilicate - - - - - 0,072 eleven. Water Up to 1 liter 12. The ratio of the surfactant mixture to antifoam PK-3 11.5: 1 11.5: 1 11.5: 1 11.5: 1 11.5: 1 -

Table number 2 Detergent composition The mass of samples fried with oil (A), g The mass of samples fat-free in a washing solution (B), g The mass of samples defatted with gasoline or white spirit (C), g Washing ability,% Foaming ability, cm Coating Quality Indicators Bending strength Specific magnetic losses P (t) 50 W / kg 1. 57,77640 57,74315 57,74040 92.4 0.7 - 1.28 2. 57,24090 57,19770 57.19755 99.6 1,2 + 1,1 3. 59.01335 58,91570 58,91565 99.9 1.4 + 1,0 4. 59,93330 59,91270 59,91265 99.75 1.7 + 1,0 5. 58,95800 58,93060 58,92820 98.2 2,8 - 1.26 6 * 58,53610 58,50330 58,49885 88.05 2.9 - 1.36

Claims (1)

Detergent for cleaning a metal surface containing sodium hydroxide, sodium carbonate, sodium silicate, sodium tripolyphosphate, ethoxylated monoalkylphenol based on propylene trimers containing 12 moles of ethylene in the molecule, ethoxylated monoalkylphenol based on propylene trimers containing 6 moles of ethylene oxide characterized in that it additionally contains a PC-3 antifoam in the following ratio of components, g / l: Sodium hydroxide 6.05-12.05 Sodium Carbonate 5.25-10.75 Sodium Silicate 0.27-0.47 Sodium tripolyphosphate 1.20-2.70 Oxyethylated Monoalkylphenol based on propylene trimers containing in a molecule of 12 moles of ethylene oxide 0.073-0.158 Oxyethylated Monoalkylphenol based on propylene trimers containing in a molecule of 6 moles of ethylene oxide 0.054-0.106 Anti-foaming agent PK-3 0.011-0.023 Water The rest is up to 1 liter moreover, the mass ratio of the mixture of ethoxylated monoalkylphenol based on propylene trimers containing 12 moles of ethylene oxide in the molecule and ethoxylated monoalkylphenol based on propylene trimers containing 6 moles of ethylene oxide in the molecule PK-3 antifoam is 11.5: 1.