JPH04335097A - Water-soluble lubricant composition for metal working - Google Patents

Abstract

PURPOSE:To provide a water-soluble lubricant compsn. for metal working with excellent resistance to rusting and bioegradation (including presistence of the effect of biodegradation resistance) while keeping lubricating properties. CONSTITUTION:A water-soluble lubricant compsn. for metal working wherein one or more compd. selected from the group consisting of glyoxal, glutaraldehyde and formalin-releasing compd. [hexahydro-1,3,5-tri(2-hydroxyethyl)- s-triazine, N-(2-hydroxyproply)aminomethanol, etc.] and an amine (monoethanolamine, diethanolamine, triethanolamine, morpholine, N-methylmorpholine, polyethyleneimine, etc.) are essential ingredients.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a water-soluble metal processing oil composition used in metal processing such as cutting and grinding, and more specifically, the present invention relates to a water-soluble metal processing oil composition that is used in metal processing such as cutting and grinding. The present invention relates to a water-soluble metalworking oil composition that is less susceptible to deterioration due to microorganisms and has an excellent long-lasting anti-microbial deterioration effect.

0002

[Prior Art] Water-soluble oil compositions used for cutting and grinding metals include mineral oils, fats and oils, fatty acids, fatty acid esters, extreme pressure additives, surfactants, antifoaming agents, metal anticorrosives, oxidation It contains an inhibitor, a preservative/antifungal agent (bactericidal agent), etc. as a constituent component, and is manufactured by appropriately mixing these according to the purpose. Such a water-soluble oil composition usually has a water content of 10 to 10
It is diluted to 0 times and used as a coolant, and this coolant has performance related to machinability and grindability (for example, improved surface finish accuracy, extended tool life, etc., hereinafter referred to as "primary performance") and workability. Performance (for example, good rust prevention, resistance to deterioration and easy management, harmlessness to the human body, low foaming, etc., hereinafter referred to as "secondary performance") is required. Among the performances required of coolants, "prevention of microbial deterioration" is particularly important in preventing: - Decrease in primary performance and secondary performance and generation of bad odors due to the progress of coolant decay; - Prevention of mold from coolant. This is very important in order to prevent the deterioration of primary performance and secondary performance and clogging of pipes in the circulation system due to the occurrence of this phenomenon. For this reason, bactericidal agents have conventionally been added for the purpose of preventing microbial deterioration of water-soluble oil compositions.

0003

[Problems to be Solved by the Invention] However, in the conventional water-soluble metal working fluid compositions, the disinfectant may be effective only against specific microorganisms, so they generally lack versatility. There was a problem in that the bactericidal agent decomposed or became inactive in a short period of time, and the bactericidal effect was significantly reduced. Furthermore, if a large amount of disinfectant is used, it may cause severe skin irritation and may have adverse effects on the human body, such as causing rough skin or dermatitis. For this reason, the concentration of the disinfectant must be controlled so that it is always contained in an optimum amount, which poses the problem of requiring a lot of effort and expense.

The present invention solves the above problems, and provides a water-soluble metal that maintains lubricating performance and has excellent rust prevention and microbial deterioration resistance (including the sustainability of the microbial deterioration resistance effect). The purpose of the present invention is to provide a processing oil composition.

[0005]

[Means for Solving the Problems] As a result of various studies on water-soluble metal processing oil compositions having excellent resistance to microbial deterioration, the present inventors discovered that a specific aldebide compound and/or formalin-releasing compound, an amine and The present invention was completed based on the discovery that a composition containing the following has significantly improved spoilage resistance and extended duration of effect. That is, the water-soluble metal processing oil composition of the present invention contains as essential components one or more compounds selected from the group consisting of glyoxal, glutaraldehyde, and formalin-releasing compounds as aldehydes, and an amine. It is characterized by the fact that

[0006] As a formalin-releasing compound that can be used in the present invention, hexahydro-1,3,5-tri(
2-hydroxyethyl)-s-triazine, N-(2-
hydroxypropyl)aminomethanol, N,N-(2
-nitro-2-ethyltrimethylene)dimorpholine, 5
-Bromo-5-nitro-1,3-dioxane and the like. Furthermore, the amines used in the present invention include:
Alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, morpholine, N
- Morpholine compounds such as methylmorpholine, polyethyleneimine, alkylamine, alkylarylamine, etc. can be mentioned.

[0007] One or more compounds selected from the group consisting of glyoxal, glutaraldehyde, and formalin-releasing compounds and amines, which are essential components of the present invention, are blended into the stock solution of the water-soluble metal processing oil composition. It may be added to the coolant, but its concentration is preferably 0.001 to 1% by weight in the coolant. If this concentration is less than 0.001% by weight, there is no effect of improving microbial deterioration resistance and lubrication performance;
This is because the effect will not be improved even if the amount is exceeded, and on the contrary, the odor of the aldehyde compound will become too strong, which is undesirable. In order to produce the water-soluble metal processing oil composition of the present invention, the components may be mixed according to conventionally known methods, except for the addition of the above-mentioned essential components. Components such as pressure additives, surfactants, antifoaming agents, metal anticorrosives, and antioxidants can be arbitrarily selected from those conventionally used.

[0008]

[Examples] The present invention will be specifically explained below with reference to Examples. The following experiments were conducted on the water-soluble metal working oil compositions (Examples 1 to 7, Comparative Examples 1 to 6) having the compositions shown in Table 1, and the performance of each oil composition was evaluated. In Table 1, Examples 1 to 4 and Comparative Examples 1 to 3 show emulsion type oil compositions, and Examples 5 to 7 and Comparative Examples 4 to 6 show soluble type oil compositions. Further, the unit of numerical values regarding the composition in the table is weight %.

[0009]

[Table 1]

(1) Preparation of Samples Sample solutions were prepared by diluting oils having the compositions shown in Table 1 with sterilized water. In this case, each of the oils of Examples 1 to 4 and Comparative Examples 1 to 3 in Table 1 was contained in sterile water at a concentration of 3% by weight, and each of the oils of Examples 5 to 7 and Comparative Examples 4 to 6 was contained in sterile water. Each was diluted to contain 2% by weight. In addition, "ISOVG7" is used as "mineral oil" in Table 1, the chlorine content of "chlorinated paraffin" is 40% by weight, rapeseed oil is used as "oil", and "petroleum sulfonate" and "nonionic" are used as "anionic surfactant". Polyoxyethylene dioleate (EO addition: 9 mol), hexahydro-1,3,5-tri-(2-hydroxyethyl) as a surfactant
-S-triazine", trade name "Glotan" (manufactured by San-Ai Oil Co., Ltd.), "2-hydroxypropylaminomethanol"
The product name "D-4" (manufactured by Bayer Japan) was used.

(2) Microbial Deterioration Resistance Test 400 ml of each sample solution was taken into a sterilized 500 ml flat-bottomed flask, and a rotten emulsion (number of viable bacteria 2 x 108 cells/ml, number of filamentous fungi 1 x 104
cells/ml, yeast fungi (1×104 cells/ml) 1% by weight were inoculated at intervals of 1, 2, 4, 8, 13 and 17 days after the start of the test, and cultured with shaking at 30° C. for 21 days. Next, on days 0, 3, 7, 14, and 21 after the start of the test, a portion of each sample solution was aseptically collected, and the number of viable bacteria, filamentous fungi, and yeast fungi was measured, as well as the pH. The presence or absence of odor was also observed. The evaluation method for each evaluation item is shown below. Further, Tables 2 and 3 (Examples) and Tables 4 and 5 (Comparative Examples) show the measurement results over time.

0012

[Table 2]

[0013]

[Table 3]

[0014]

[Table 4]

[0015]

[Table 5]

■pH Measured using a glass electrode pH meter. Here, the decrease in pH suggests the degree of microbial deterioration, and it is considered that the more severe the decrease in pH is, the more advanced the microbial deterioration is.

① Measurement of the number of viable bacteria and fungi The number of viable bacteria was determined by the plate counting method using an ordinary agar medium. The number of filamentous fungi was measured by plate counting using a potato dextrose agar medium supplemented with antibiotics (chloramphenicol and tetracycline), and the number of yeast fungi was measured using a Sabouraud agar medium supplemented with tetracycline.

■Evaluation of Odor Odor was evaluated by dividing the odor strength into three ranks as follows. ○: No putrid odor, △: Slightly putrid odor, ×: Putrid odor.

[0019] Rust prevention property: 15 g of dry-cut cast iron chips were taken in a petri dish with a diameter of 60 mm, and a sample solution was added to the sample solution to wet it uniformly. Excess solution was drained off, and the occurrence of rust over time was observed. The display is: ◎: No rust, ○: 1 to 5 points rust, △: 10
Rust occurred at several points, ×: Rust occurred on 1/3 or more surfaces.

As shown in the results in Tables 2 to 5, the water-soluble metalworking oil compositions of Examples 1 to 7 according to the present invention had the following properties:
Compared to conventional oil compositions (oil compositions of Comparative Examples 1 to 6), it is clearly superior in microbial deterioration resistance, and as a result, there is very little deterioration in rust prevention properties, and there is no odor generation. few.

(3) Application Example In order to further clarify the practical effectiveness of the water-soluble oil composition for metal processing of the present invention, we conducted an experiment at a production processing factory (motorcycle crankcase processing line) where the oil composition is used. ), first, the oil composition of Comparative Example 1 and then the oil composition of Example 1 were subjected to actual machine tests under the following processing conditions, and the results are shown in Tables 6 and 7.

[0022]

[Table 6]

[0023]

[Table 7]

(Processing conditions) Workpiece: ADC-12 (T
-6 processing) Processing method: Milling and hole machining Oil tank capacity: 6,000 liters Oil dilution ratio: 30 times Replenishment amount of oil stock solution: 300 liters/month Test period: 4 months As shown in Tables 6 and 7, Compared to the conventional oil composition (Comparative Example 1), the oil composition of Example 1 has excellent microbial deterioration resistance and rust prevention properties in practical use, and the lubricating performance remains unchanged. Is recognized. In addition, Example 1
In both Comparative Example 1 and Comparative Example 1, there was no particular problem with bubbling in the coolant during the test period.

[0025]

As described above, the water-soluble metal processing oil composition of the present invention has better microbial deterioration resistance (deterioration resistance and duration of effect) than conventional water-soluble metal processing oil compositions. It is significantly improved compared to the conventional method, and it is possible to suppress the generation of putrid odor even during long-term use, and as a result, the deterioration in rust prevention properties is also reduced. Furthermore, the oil composition of the present invention has no difference in lubricating performance or foaming property compared to conventional oil compositions. Therefore, by using the water-soluble metalworking oil composition of the present invention, it is possible to extend the life of the coolant, reduce the amount of oil used and the running cost, and reduce the amount of oil used when using a disinfectant. There is no adverse effect on the human body, and the effort of managing the content to ensure that it is contained in an appropriate amount can be saved.

Claims (1)

[Claims] 1. A water-soluble oil composition for metal processing, which contains as essential components one or more compounds selected from the group of glyoxal, glutaraldehyde, and formalin-releasing compounds and an amine.