RU2144560C1 - Bactericidal additive for cutting fluids - Google Patents

Abstract

FIELD: lubricating fluids. SUBSTANCE: water-based additive contains, %: monoethanolamine, 28-45; boric acid, 16-27; and formalin, 15-24. EFFECT: provided total bacteria and fungi resistance when protecting aqueous and aqueous-emulsion cutting fluids. 2 tbl

Description

 The invention relates to compositions for protecting aqueous and aqueous emulsion cutting fluids used in the machining of metals from microbiological damage.

 Water and water emulsion cutting fluids during operation are susceptible to microbiological damage. At the same time, the technological, operational, physico-chemical and sanitary-hygienic properties of these products are deteriorated, which become unsuitable for further operation. Dramatically reduced service life.

 Known bactericidal additive, which is a condensation product of monoethanolamine with dimethyl urea (TU 6-00-5011400-2-88), which loses effectiveness after a long period of operation.

 Known antimicrobial additive, which is a mono - or di- (N, N-dialkylaminomethyl) -8-hydroxyquinolines or their Quaternary ammonium salts [ed. USSR N 1071621, MKI C 10 M 1/32, 1984]. The disadvantage of the additive is low efficiency.

 After a certain time of using the antimicrobial additive, microorganisms get used to it and lose its effectiveness, i.e. to suppress the growth of microorganisms, an increasing concentration of the reagent is required. Therefore, work is constantly ongoing to expand the range of additives used.

 Closest to the proposed invention is a bactericidal additive, which is an aqueous solution of formaldehyde [Kachan V.I. et al. "Testing the bactericidal efficacy of antimicrobial additives for cutting fluids." - Oil refining and petrochemistry. - 1978, N 8, p. 22-24]. The disadvantage of the product is lack of effectiveness.

 The present invention is based on the task of creating a highly effective antimicrobial additives.

The problem is solved in that the bactericidal additive containing formalin and water additionally contains monoethanolamine and boric acid in the following ratio of components, in wt.%:
Monoethanolamine - 28-45
Boric acid - 16-27
Formalin - 15-24
Water - the rest
To obtain additives, monoethanolamine is used according to TU 6-02-915-84, boric acid according to GOST 18704-78 and formalin (37% solution of formaldehyde in water) according to GOST 1625-89. As water, for example, steam condensate can be used.

 An analysis of the known solutions selected in the search process showed that in science and technology there is no object similar in terms of the claimed combination of features and advantages, which allows us to conclude that the invention meets the criteria of "novelty" and "inventive step".

 To prove the compliance of the proposed solution with the criterion of "industrial applicability" we give examples of the preparation of the composition.

 Example 1

To 28 g of monoethanolamine add 41 g of water and mix until smooth. Then, 16 g of boric acid are added with stirring and mixed until homogeneous. While stirring in small portions, add 15 g of formalin, while the temperature of the reaction mixture increases, the process is conducted with cooling of the reaction mixture at a temperature of 50-60 ^o C. After adding the entire amount of formalin, the mixture is stirred at a temperature of 50-60 ^o C until a homogeneous product is obtained. for one hour.

 Examples 2 to 7 are performed analogously to example 1.

 The resulting compositions are clear liquids from light yellow to light brown in color. The compositions of the obtained additives are presented in table. 1.

 From the obtained compositions prepare 0.1 and 0.3% aqueous solutions in water, which are then used for biostability tests according to GOST 9.085-78. The tests are carried out on resistance to the effects of aerobic bacteria, anaerobic (sulfate-reducing) bacteria and molds.

For the tests, a mixture of pure cultures of the following types of aerobic bacteria was used: Escherichia coli, Mucobacterium phlei, Pseudomonas aeruginosa, Pseudomonas oleovorans, Staphilococcus aureus, Pseudomonas fluorescens, Bacillus subtilis, Pseudomonas putida. A mixture of pure cultures of the genus Desulfouibrio, Pseudomonas, Achromobacter was used as sulfate-reducing bacteria. The following species were used as molds: Aspergillus niger, Chactomlum globosum, Cladosporium gossipicola, Cladosporium resinae, Penicillium chrysogenum, Trichoderma koningii, Trichoderma viride, Torula convoluta, Cehalosporium acremonium. The test results were evaluated in points according to GOST 9.085-78:
0 points - the lack of growth of microorganisms, complete bacterial resistance or complete fungus resistance;
I point - the growth of microorganisms is barely visible, zones of lack of growth of microorganisms are noticeable. Satisfactory bacterial or fungal resistance;
II point - there are no zones of lack of growth of microorganisms, non-bacterial resistance and non-fungal resistance;
The test results are presented in table.2.

 Data analysis table. 2 shows that the proposed antimicrobial additive has a sufficiently high efficiency and can be used to protect against microbiological damage to aqueous and aqueous emulsion working solutions of cutting fluids.

Claims (1)

A bactericidal additive to cutting fluids for machining metals, containing water and formalin, characterized in that it additionally contains monoethanolamine and boric acid in the following ratio, wt.%:
Monoethanolamine - 28 - 45
Boric acid - 16 - 27
Formalin - 15 - 24
Water - Else

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