RU1824431C - Detergent for cleaning metal surfaces - Google Patents

Abstract

The inventive detergent for cleaning a metal surface contains, wt.%: Sodium salt of dialkyl-polyethylene glycol esters of phosphoric acid 3-5, sodium metasilicate 30-40, sodium tripolyphosphate 20-30, soda ash to tOO. 3 tab.

Description

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The invention relates to detergents for cleaning metal surfaces of machine parts from mineral oils and products of their decomposition and can be used in the field of maintenance and repair of machines in agriculture, transport, for cleaning products in mechanical engineering, instrument making and other industries

The purpose of the invention is to increase the washing ability of the composition, increase the service life of solutions based on it when cleaning from asphalt-tar contaminants, and reduce foaming ability.

The indicated goal is achieved by that. that a detergent containing a surfactant sodium metasilicate, sodium tripolyphosphate and soda ash contains sodium dialkylpolyethylene glycol esters of phosphoric acid (oxyphos-23A) as a surfactant in the following ratio, May% Sodium salt of dialkylpolyethylene glycol esters of phosphos

OXYPHOS-23A) 3-5

Sodium metasilicate 30-40 Sodium tripolyphosphate 20-30 Calcined

sodaUp to 100

Oxyfos-23A - sodium salt of dialkylpolyethylene glycol esters of phosphoric acid of the General formula

CnH2f i (OC2H4) 60bPOONa. where n is 8-10.

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Analysis of known detergents based on surfactants and alkaline salts showed that the service life of their solutions depends on the type and concentration of surfactants and alkaline salts, on their percentage in the composition, and also on the nature of the removed contaminants. Known surfactants in combination with alkaline salts do not provide detergents with the properties that they exhibit in the described composition, namely, an increase in the washing ability and service life of solutions when cleaning from asphalt-resinous contaminants and a significant decrease in foaming ability.

The preparation of the detergent is carried out by dry mixing of its constituent components. Finished detergent is a non-toxic loose powder of white color, odorless, readily soluble in water.

Table 1 presents the formulation of the detergent according to the examples.

Detergent is used in the form of 1-3% aqueous solutions at 70-80 ° C.

For testing, natural asphalt-tar contaminants were used, which were selected from diesel engines that were received for major repairs.

The foaming ability of detergents was determined by the Ross Miles method and was characterized by the amount of foam and its stability.

Asphalt-resinous soils were applied with a mass of 0.2 g in a uniform layer onto the samples in the form of steel plates measuring 70 x 35 x 2 mm.

These samples were cleaned at the laboratory washing facility by dipping with the excitation of the washing solution using a stirrer with a constant speed (3000 rpm).

The cleaning process is carried out as follows.

980 ml of tap water is poured into the bath of the washing installation and the temperature is brought to 40-50 ° C, then 20 g of the proposed detergent is dissolved in it and the temperature of the solution is brought to 70 ° C. thereafter, a sample is lowered into the washing solution and cleaning is carried out.

The duration of cleaning (in minutes) was taken as an indicator characterizing the detergent ability of the agent until the complete removal of asphalt-tar contaminants from the surface of the sample.

purification was evaluated by a known method (wetting method). In this case, the cleaning time was determined both in the freshly prepared solution and as the accumulation of asphalt-resinous contaminants in it with a content of 5 g / l, respectively; 10 g / l; 20 g / l; 40 g / l; 60 g / l

For comparison, the samples were similarly cleaned from tar-tar contaminants using the known detergent MC-15. The test results are presented in table.2. The results of comparative tests show that the solutions of the proposed detergent in comparison with the solutions of the prototype have a high aging ability.

So, for example, with the accumulation of asphalt-resinous contaminants in the test solutions with a content of 40-60 g / l, the cleaning time of the samples in the proposed samples is 2.7 times lower than in the prototype solutions, which allows to extend the service life of the solutions by 2 5-3.0 times. In addition, the foaming ability of the proposed detergent is 2-3 times lower than that of the prototype, which allows the use of detergent for cleaning from asphalt-resinous soils in both submersible and jet washing machines.

Claims (1)

SUMMARY OF THE INVENTION A detergent for cleaning a metal surface containing sodium metasilicate, sodium tripolyphosphate, soda ash and a surfactant, characterized in that, in order to increase the washing ability of the agent, to increase the service life of the detergent solution when cleaning from asphalt - resinous impurities and a decrease in the foaming ability of the agent, it contains as a surfactant the sodium salt of phosphoric acid dialkyl polyethylene glycol esters of the general formula CnH2n-n (OC2H4) 60 2POONa, where p is 8-10 in the following ratio of components, wt.%: Sodium salt of dialkylpolyethylene glycol esters of phosphoric acid the specified formula 3-5 Sodium Metasilicate 30-40 Sodium tripolyphosphate 20-30 Soda Ash Up to 100 Table 1 table 2 Table 3