Detergent for metal surface

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

 

The invention relates to detergents and can be used in metallurgy for degreasing of metal coils in the units of continuous treatment before applying various types of coatings (elektroizolyacionnogo, phosphate and so on).

Known detergent for cleaning metal surfaces, containing components in %:

Benzyl ether of oxidationreduction 5

Sodium hydroxide 30

Sodium carbonate 30

Metasilicate sodium (5 H2O) 35

/"Surface phenomena and surfactants". Handbook, 1984, s/.

Having a satisfactory cleaning effect, the composition has drawbacks. Part of large quantities of metasilicate sodium forms on the metal surface passive film, which subsequently has a negative influence on the formation of different coatings, which, in turn, leads to deterioration in the quality of coatings.

Closest to the invention as intended and achieved result is detergent (EN 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

Metasilicate sodium 0,42-0,72

Ethoxylated monneypenny

on the basis of trimers of propylene containing

in the molecule of 12 mol ethylene oxide 0,084-0,144

<> Ethoxylated monneypenny

on the basis of trimers of propylene containing

in the molecule of 9 mol of ethylene oxide 0,056-0,096

Sodium tripolyphosphate 1,26-2,16

Water the rest up to 1 L.

Using this tool in the form of an aqueous solution at a temperature of 65-80°With time and degreasing 25-30 with you to ensure a good degree of cleaning of the metal surface in high-speed machining of metal.

Lack of funds is a high foaming, making it impossible to use it in units of speed metal and leads to increased consumption of material.

The objective of the invention is to develop a detergent with high cleaning ability, low foaming during processing of the metal units high-speed, continuous processing, and which is not a negative effect on the subsequent formation of coatings, in particular for insulation coating, with good quality.

This object is achieved in that the detergent containing sodium hydroxide, sodium silicate, sodium carbonate, sodium tripolyphosphate, ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 12 moles of ethylene oxide, ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 6 mol is th ethylene oxide optionally contains a non PC-3, in the following ratio of components, g/l:

Sodium hydroxide 6,05-12,05

Sodium carbonate is a 5.25-10,75

Sodium silicate is 0.27-0,47

Sodium tripolyphosphate, 1,20-2,70

Ethoxylated monoalkylphenols

on the basis of trimers of propylene containing

in the molecule of 12 moles of ethylene oxide 0,073-0,158

Ethoxylated monoalkylphenols

on the basis of trimers of propylene containing

in the molecule of 6 moles of ethylene oxide 0,054-0,106

The non PC-3 0,011-0,023

Water the rest up to 1 L.

Moreover, the mass ratio of the mixture of polyoxyethylene monoalkylphenol based trimers of propylene containing in the molecule 12 moles of ethylene oxide and ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 6 moles of ethylene oxide to the non PC-3 is 11.5:1.

The claimed ratio of components allows to provide a cleaning tool:

- high ability;

- to use the units of speed metal, because working solutions of detergent have low foaming;

- to use before applying insulation coating.

The efficiency and stability of purification wash solution is stored in the accumulation of a significant amount of pollution.

For the study was composed of five detergent compositions with different zootoxin the eating of components and composition are known.

The detergent compositions were prepared by serial dilution in warm water (35-40° (C) for 15-20 min calculated quantity of ingredients.

After complete dissolution of the composition was pumped into the working bath.

The composition of a known drug was prepared in a similar manner.

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

Formulations and known detergents were tested for foaming ability. The essence of the definition was to ensure that the standard cylinder, 250 cm3poured 100 cm3solution, closed with a cork and shake 20 times. After 15 with measured initial foam height in centimeters. The determination was made at a temperature of 60°C.

The quality of cleaning was evaluated from the results of removal from the metal surface contaminations of industrial oils, i.e. detergency solution.

Tests were conducted on samples of the sheet of anisotropic electrical steel size 150×70 mm

Samples twice thoroughly clean petrol or white spirit, were dried for 20 min in air, brought to a constant temperature in a desiccator and weighed. The weighing result was recorded with an accuracy of four decimal figures.

Net samples were contaminated industrial oil grade 20 dipping in OSD with butter, then hung for 24 h to remove excess oil.

Then the samples were weighed. The result of weighing in grams was recorded with an accuracy of four decimal figures.

Weighted steel samples were kept for 30 s at a temperature of 60-65°in the formulations and known detergents, using 20-fold immersion in the solution. After some time, fat-free samples were washed under running tap water with a temperature of 15-20C for 0.5 minutes Having to drain the excess water, the samples were placed for a few seconds in a vessel with ethanol and finally dried in a drying Cabinet at a temperature of 100-110C. Cooled the samples first in air and then in a desiccator until a constant temperature and weighed. The weighing results were recorded with the accuracy of four decimal places.

Washing capacity in % was determined by the formula:

,

where a is the mass of the sample, contaminated oil, g;

In the mass of the sample processed in the washing solution, g;

With the mass of the sample after degreasing petrol or white spirit, he

To determine quality indicators for insulation coating samples of the sheet of anisotropic electrical steel were degreased in stock (see table 1 app.1-6) at 60-65C for 10-15 sec, washed in warm water with 10-15 and obrabecim is whether in insulating composition for 5 s at a temperature of 20-40C. The excess dielectric composition was removed by extraction gulirovanie rolls. The coating was subjected to heat treatment at 800C for 60 S.

The quality of the insulating coating was determined by the following parameters.

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

Specific losses in the magnetic induction of 1.7 T and a frequency of 50 Hz (P1,7/50) was determined according to GOST 12119-80.

Results indicators foaming, cleaning ability and quality of the insulating coating are shown in table 2.

As can be seen from examples (see table 2 PR, 3, 4), the content of sodium hydroxide, sodium carbonate, sodium silicate, sodium tripolyphosphate, polyoxyethylene monoalkylphenol based trimers of propylene containing in the molecule 12 moles of ethylene oxide, polyoxyethylene monoalkylphenol based trimers of propylene containing in the molecule 6 moles of ethylene oxide, the non PC-3 in the claimed limits, provides low foaming working solution, high washing ability and opportunity to obtain further electrically insulating coating with good mechanical and magnetic properties.

Change the content of the components above or below the proposed limits (see table 2 app.1, 5) bring the one case to the decrease in detergency, and the other to high foaming solution and in both cases a negative impact on quality indicators insulating coating (low mechanical properties and high specific magnetic losses).

Example 6 describes the properties of the prototype and of the coatings obtained after pre-processing in this structure.

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

1. High degree of cleaning of the metal surface due to the high detergency of the composition.

2. Low consumption means, as occurs ash detergent together with foam.

3. The reduction of production costs (technology in the preparation and adjustment of the working bath) and increase the operating time of the solution.

4. The possibility of using it during preview processing of anisotropic electrical steel.

Table No. 1
No. p.pComponentsThe content in the composition, g/l
  123456*
1.Sodium hydroxide4,906,05 9,0512,0513,211,04
2.Sodium carbonate4,55the 5.258,010,7511,659,84
3.Sodium silicate0,190,270,370,470,56-
4.Sodium tripolyphosphate1,061,201,952,703,02,16
5.Ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 12 moles of ethylene oxide0,0620,0730,1160,1580,175-
6.Ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 6 moles of ethylene oxide0,0420,0540,080,1060,124-
7.The non PC-30,0090,0110,0170,0230,026-
8.Ethoxylated monneypenny based trimers of propylene containing in the molecule 12 mol ethylene oxide- ---0,144
9.Ethoxylated monneypenny based trimers of propylene containing in the molecule 9 mol ethylene oxide-----0,096
10.Metasilicate sodium-----0,072
11.WaterTo 1 liter
12.Mixing ratio of the surfactant to the non PC-311,5:111,5:111,5:111,5:111,5:1-

Table No. 2
The detergent compositionThe bulk of the samples zailennyh oil (A), gWeight low-fat samples in the washing solution (B), gThe samples are fat-free petrol or white spirit (S), gWashing capacity, %Foaming ability, cmThe coating quality indicators
     Bending strength Specific magnetic losses P (t) 50 W/kg
1.57,7764057,7431557,7404092,40,7-1,28
2.57,2409057,1977057,1975599,61,2+1,1
3.59,0133558,9157058,9156599,91,4+1,0
4.59,9333059,9127059,91265of 99.751,7+1,0
5.58,9580058,9306058,92820of 98.22,8-1,26
6*58,5361058,5033058,4988588,052,9-1,36

Detergent for cleaning metal surfaces, containing sodium hydroxide, sodium carbonate, sodium silicate, sodium tripolyphosphate, ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 12 moles of ethylene oxide, ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 6 moles of ethylene oxide, wherein the additional content is t non PC-3 in the following ratio of components, g/l:

Sodium hydroxide 6,05-12,05

Sodium carbonate is a 5.25-10,75

Sodium silicate is 0.27-0,47

Sodium tripolyphosphate, 1,20-2,70

Ethoxylated monoalkylphenols

on the basis of trimers of propylene containing

in the molecule of 12 moles of ethylene oxide 0,073-0,158

Ethoxylated monoalkylphenols

on the basis of trimers of propylene containing

in the molecule of 6 moles of ethylene oxide 0,054-0,106

The non PC-3 0,011-0,023

Water the Rest up to 1 l

moreover, the mass ratio of the mixture of polyoxyethylene monoalkylphenol based trimers of propylene containing in the molecule 12 moles of ethylene oxide and ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 6 moles of ethylene oxide, for non PC-3 is: 11,5 :1.



 

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