Detergent for cleaning of metallic surface

FIELD: chemistry.

SUBSTANCE: invention is used in metallurgy industry for degreasing rolled metal products on the aggregates of continuous processing before application of different kinds of coatings (zinc, galvalume and etc.). The agent contains in g/l: sodium hydroxide 5.4-12.0, sodium carbonate 3.3-8.2, trisodium phosphate 0.6-1.25, sodium tripolyphosphate 1.0-2.5, hyrdroxyethylated alkylphenol on the basis of propylene trimer containing in a molecule 12 moles of ethylene epoxide 0.17-0.37, polyethyleneglycol esters of synthetic primary alcohol of C12-C14 fraction 0.14-0.23, alkylphenilpolyoxyethelenglycol acetal 0.11-0.28, chelate 0.02-0.075, defoaming agent 0.001-0.0025, water - 1 liter. Mass ratio of the blend of the organic and inorganic part of the composition to the blend of surfactants is 24.5:1. Chelate consists of disodium salt of tetrine, hydrous and trisodium salt of hydroxyetheledenediphosphonic.

EFFECT: increase of purification degree of metallic surface thanks to high cleaning capability of the composition and foam forming decrease.

2 tbl

 

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: zinc, aluminium, etc.

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

Benzyl ether of polyoxyethylene op5
Sodium hydroxide30
Sodium carbonate30
Metasilicate sodium (5H2Oh)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, g/l:

Hydra is xed sodium 6,44-11,04
Sodium carbonate5,74-9,84
Metasilicate sodium0,42-0,72
Ethoxylated monneypenny
on the basis of trimers of propylene containing
in the molecule of 12 mol ethylene oxide0,084 at 0.144
Ethoxylated monneypenny
on the basis of trimers of propylene containing
in the molecule of 9 mol of ethylene oxide0,056-0,096
Sodium tripolyphosphate1,26-2,16
WaterThe rest is up to 1 L.

This cleanser cleans quite well the metal at a temperature of 65-80°With time and degreasing 30-60 seconds, but does not give a good cleansing results when high-speed processing from 4 to 12 seconds, as well as to the lack of funds is a high foaming, making it impossible to use it to spray the units of speed metal.

The objective of the invention is to develop a detergent with high cleaning ability, low foaming, when the degreased cold-rolled steel by spray units speed (4-12 sec), continuous processing of metal is that is not a negative influence on the formation of zinc, Galvalume coatings with good performance.

This object is achieved in that the detergent containing sodium hydroxide, sodium carbonate, sodium phosphate trehzameshchenny, sodium tripolyphosphate, ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 12 moles of ethylene oxide, polietilenglikolya synthetic esters of primary alcohols fraction12-C14, further comprises acetal of alkylphenolethoxylates, complex (disodium salt of ethylenediaminetetraacetic acid, water or trinacria salt hydroxyethylidenediphosphonic acid, water) and defoaming additive in the following ratio of components, g/l:

Sodium hydroxidea 5.4-12, 0mm
Sodium carbonate3,3-8,2
Sodium phosphate trehzameshchennyfrom 0.6 to 1.25
Sodium tripolyphosphate1,0-2,5
Ethoxylated monoalkylphenols
on the basis of trimers of propylene containing
in the molecule of 12 moles of ethylene oxide0,17-0,37
Polietilenglikolya synthetic esters
per the ary alcohols fraction 12-C140,14-0,33
The acetal of alkylphenolethoxylates0,11-0,28
The complexone (disodium salt Ethylenediamine
tetraoxane acid, water, or
trinacria salt hydroxyethylidenediphosphonic
acid, water)0,02-0,075
Defoaming additive0,001-0,0025
WaterThe rest is up to 1 L.

Moreover, the mass ratio of the mixture of inorganic and organic part of the composition to the mixture of surfactants is 24.5:1.

The claimed ratio of components allows cleaning tool:

- to provide high washing capacity;

- use it on units of speed metal spray type as working solutions have a low foaming;

- use it before applying zinc and aluminium coatings.

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

For the study was made up of 5 detergent compositions with different ratios of components and composition are known.

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

After complete dissolution of the composition was pumped into the laboratory spray installation.

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

The compositions known and offer detergent are shown in table 1.

Formulations and known detergent was 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 30 seconds measured initial foam height in centimeters. The determination was made at a temperature of 70°C.

Ability was determined by the gravimetric method, which is based on the determination of the percentage of slavemaster dirt from the surface of the metal sample.

Tests were conducted on samples of cold-rolled metal 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 into a container of oil, then hung for 24 hours to remove excess oil.

C is the sample weighed. The result of weighing in grams was recorded with an accuracy of four decimal figures.

Bathroom spray laboratory washing machines heated solution to a temperature of 70-75°With the included pump and through the hole in the lid was installed in the tub contaminated samples and purified 4-12 sec.

After some time, fat-free samples were removed from the bath, washed with a brush, under running tap water with a temperature of 60-65°C for 7-10 seconds and dried in a drying Cabinet at a temperature of 100-110°C. 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 percent removal of dirt from the metal surface 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

The quality of the zinc coating, the adhesion strength with the base, checked the standard method according to GOST 14019. The essence of the method was to ensure that the test sample galvanized metal was bent at 180° and determine the adhesion strength of the coating with a steel base. If satisfactory the result should not be peeling zinc and aluminium coating on the outside. (Pets grid of small cracks along the length of the bending and delamination of the coating at a distance of not more than 6 mm from the edges of the sample).

In addition to the basic test samples galvanized metal was tested for adhesion to the basis on device Lockformer. This device was formed by a double bend metal 180° in one plane. Bending was carried out along the entire length of the sample (<250 mm). One sample was tested across the direction of rolling, the second - along. Evaluation of adhesion was carried out by the visual method. In place of the bend should not be delaminations, exposing the steel surface. (Pets grid of small cracks).

Results indicators foaming, cleaning ability and the quality of the zinc 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 phosphate translesanas, sodium tripolyphosphate, polyoxyethylene monoalkylphenol based trimers of propylene containing in the molecule 12 moles of ethylene oxide, polyethylene glycol ethers of synthetic primary alcohols fraction12-C14the acetal of alkylphenolethoxylates, complexone (disodium salt of ethylenediaminetetraacetic acid, water or trinacria salt hydroxyethylidenediphosphonic acid, water), and p is Nagasawa additives in the inventive within provides low foaming working solution high washing ability and opportunity to obtain further coverage with good quality.

Changing the contents of the components are below the proposed limits (see table 2, app.1) leads to decrease in detergency, and Vasarely values to increased foaming of the solution and does not improve cleaning properties, but increases the cost of the composition. In both cases a negative impact on quality indicators coatings.

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 its use in pre-processing cold-rolled steel prior to application of zinc and aluminium coating.

Table 1
No. p.pComponents The content in the composition, g/l
123456*
1.Sodium hydroxide4,5of 5.48,7to 12.013,211,04
2.Sodium carbonate2,83,35,88,29,09,84
3.Sodium phosphate trehzameshchenny0,50,60,91,251,4--
4.Sodium tripolyphosphate0,91,01,72,52,82,16
5.Ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 12 moles of ethylene oxide0,140,170,270,370,41--
6.Polietilenglikolya synthetic esters of primary alcohols fraction C12-C140,120,140,240,330,36--
7. The acetal of alkylphenolethoxylates0,090,110,190,280,31--
8.The complexone (disodium salt of ethylenediaminetetraacetic acid, water or trinacria salt hydroxyethylidenediphosphonic acid, water)0,0150,020,0480,0750,1--
9.Antifoaming additive0,00090,0010,00180,00250,003--
10.Ethoxylated monneypenny based trimers of propylene containing in the molecule 12 mol ethylene oxide----------0,144
11.Ethoxylated monneypenny based trimers of propylene containing in the molecule 9 mol ethylene oxide----------0,096
12.Metasilicate sodium----------0,072
13. WaterTo 1 liter
14.The ratio of mixture of inorganic and organic parts of the composition to the mixture of surfactants24,5:124,5:124,5:124,5:124,5:1-

Table 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, cmIndicators of quality zinc and aluminium coating (adhesion strength in bending at 180° and on device Lockformer)
1.17,9714017,9688517,96855to 89.50,7Not satisfactory
2.17,6717517,6686317,6686099,01,2Satisfactory
3.17,0511017, 0467317,0467099,31,25Satisfactory
4.17,4957017,49327 17,4932599,21,3Satisfactory
5.17,2413017,2385017,2384096,62,6Not satisfactory
6*17,6790017,6761017,6754582,73,5Not satisfactory

Detergent for cleaning metal surfaces, containing sodium hydroxide, sodium carbonate, sodium phosphoric acid trehzameshchenny, sodium tripolyphosphate, ethoxylated monoalkylphenols based trimers of propylene containing in the molecule 12 moles of ethylene oxide, polietilenglikolya synthetic esters of primary alcohols fraction12-C14, defoaming additive, characterized in that it further comprises an acetal of alkylphenolethoxylates, combined - ethylenediaminetetraacetic acid disodium salt water or hydroxyethylidenediphosphonic acid trinacria salt water in the following ratio of components, g/l:

sodium hydroxidea 5.4-12, 0mm
sodium carbonate3,3-8,2
sodium phosphate trehzameshchennyfrom 0.6 to 1.25
sodium tripolyphosphate 1,0-2,5
ethoxylated monoalkylphenols
on the basis of trimers of propylene containing
in the molecule of 12 moles of ethylene oxide0,17-0,37
polietilenglikolya synthetic esters
primary alcohols fraction12-C140,14-0,33
the acetal of alkylphenolethoxylates0,11-0,28
the complexone0,02-0,075
defoaming additive0,0009-0,0025
waterthe rest is up to 1 l

moreover, the mass ratio of the mixture of inorganic and organic part of the composition to the mixture of surfactants is 24.5:1.



 

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