JPH02214797A - Water-soluble metal working oil - Google Patents

Abstract

PURPOSE:To obtain the subject working oil, containing gum turpentine and improved in putrefaction resistance without impairing characteristics, such as lubricity or rust preventive properties and used for working, such as cutting or grinding, of metals. CONSTITUTION:The objective working oil containing (A) normally 5-90wt.% (preferably 10-50wt.%) gum turpentine and (B) normally 3-20wt.% emulsifying agent consisting of a surfactant, such as polyoxyethylene alkyl ether, polyoxyethylene allyl ether, polyoxyethylene alkyl ester, sorbitan alkyl ester or fatty acid amide.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a water-soluble metal working fluid used for processing such as cutting and grinding of metal.

Conventional technology The water-soluble metal processing fluids that have traditionally been used in large quantities for processing such as cutting and grinding metals have poor corrosion resistance, leading to problems in the management of the fluids used and the quality assurance of processed products. .

For example, when used for a long period of time, processing oils not only become rotten by microorganisms and generate bad odors, but also deteriorate the important properties of processing oils, such as lubricity and rust prevention.

In order to solve these problems, various preservatives and disinfectants, such as triazine and thiazoline preservatives, have been added to metalworking fluids, but they do not provide long-term antiseptic and disinfectant effects. First, because this type of additive must be added in a relatively large amount, it also causes other occupational hygiene problems such as irritation and toxicity.

Problem to be Solved by the Invention This invention solves the above problems in the field,
This was done in order to provide a water-soluble metal working fluid with improved corrosion resistance without impairing properties such as lubricity and rust prevention.

SUMMARY OF THE INVENTION The present invention relates to a water-soluble metalworking fluid containing gum turpentine.

Gum turpentine is usually obtained by steam distillation of raw pine resin;
The main component is said to be a-pinene, but it is a natural product,
It does not necessarily have a strictly constant composition.

Gum turpentine, which is commonly used industrially, is inexpensive and available in large quantities, so it can be used in any proportion, but it is usually 5 to 90% by weight, preferably 10 to 50% by weight.

Gum turpentine is a plant oil that has been known for a long time, so its usage is generally well known, but it is safe as long as it is not applied in large quantities directly to sensitive areas of the skin or exposed to swallowing. Furthermore, since it suppresses the generation of bad odors, it is also preferable in terms of work hygiene.

Since gum turpentine is insoluble in water, the water-soluble metalworking fluid according to the present invention contains an emulsifier, such as polyoxyethylene alkyl ether, polyoxyethylene allyl ether, polyoxyethylene alkyl ester, sorbitan alkyl ester, fatty acid amide, etc. Blend with surfactant.

The amount of emulsifier added depends on the composition of gum turpentine and the type of emulsifier, but is usually 3 to 20% by weight.

The water-soluble metalworking fluid according to the invention may optionally further contain conventional additives, such as extreme pressure additives (e.g., chlorinated paraffins, sulfurized mineral oils, etc.), rust inhibitors (e.g., petroleum sulfonates, alkylsulfonamide carbonates, etc.). acids, etc.), lubricants (for example, fatty acids, fatty acid esters, etc.), etc. may be blended as appropriate.

The water-soluble metal processing fluid according to the present invention can be widely used as a processing fluid for metal cutting, grinding, etc., and is particularly suitable as a cutting/grinding fluid defined by JIS W1 and W2.

Hereinafter, the present invention will be explained by examples.

Examples 1 to 6 Samples 1 to 6 were prepared by diluting water-soluble metal working fluids 1 to 6 prepared according to the formulations shown in Table 1 10 times with water, respectively.
was prepared.

The rust prevention, friction coefficient, pressure resistance, surface tension, and antibacterial properties of Samples 1 to 6 were measured by the following methods, and the results are shown in Table 2.

(1) Casting chips method: Put the casting chips into a Petri dish, immerse them in the sample solution for 10 minutes, then drain the solution.
The state of rust on the chips after 72 hours was examined. Rust prevention was evaluated using a 10-point scale, with a score of 10 indicating no rust at all.

(2) Cold-rolled steel plate method: A polished cold-rolled steel plate is immersed in the sample solution for 10 minutes, then pulled out, air-dried, and placed indoors for 7 minutes.
After being left for 2 hours, the steel plate was examined for any rusting state. The rust prevention property was evaluated in the same manner as in case (1).

Friction Coefficient The friction coefficient at 25° C. was measured using a Soda type pendulum type oil tester.

Using a four-ball type lubricant tester, 20 Or, p, +
m.

The pressure resistance was measured by the sequential loading method.

Surface tension The surface tension at 25° C. was measured using a Dunuy type surface and a tensiometer.

A putrid emulzidine solution containing more than 10' viable bacteria/mQ collected at an antibacterial metal processing factory was inoculated into a liquid medium and incubated at 30°C for 4 hours.
The activated putrefaction liquid 2raQ cultured for 8 hours was transferred to a sterilized ordinary agar medium (20+nl2) in a petri dish (diameter 90a+m).
) and solidified the agar, and then air-dried at room temperature for 3 to 4 hours. Then, 10p12 of the sample solution was dropped onto the center of the agar surface, and the mixture was heated at 30°C for 48 hours. Antibacterial properties were evaluated by examining the presence or absence of bacterial growth in the area where the sample was dropped after incubation. The antibacterial properties of sample solutions 1" to 6' or 1" to 6" prepared by diluting metalworking oils 1 to 6 with water 20 times or 30 times, respectively, were evaluated in the same manner. These results are shown in Table 3 or It is shown in Table 4. In Tables 2 to 4, "+" and "-" indicate cases where bacterial growth was observed and cases where bacterial growth was not observed, respectively.

Comparative Examples 1 to 4 Samples a to d in which water-soluble metal working fluids a to d prepared according to the formulations shown in Table 1 were diluted 10 times with water, respectively.
The rust prevention, friction coefficient, pressure resistance, surface tension and antibacterial properties of the samples were measured in the same manner as in Examples 1 to 6, and the results are shown in Table 2.

Furthermore, metalworking fluids a to d were added 20 times or 3 times, respectively.
Sample solution a″~d° or a″~d″ diluted with water to 0 times
The antibacterial properties of the samples were evaluated in the same manner, and the results are shown in Table 3 or Table 4.

(Hereinafter, blanks) Effects of the Invention The water-soluble metal processing fluid according to the present invention exhibits a long-lasting anticorrosion effect without impairing properties such as lubricity and rust prevention, so it can be used as a processing fluid for metal cutting, grinding, etc. for a long time as
; it can be used without causing problems in terms of work hygiene, and it also does not pose problems regarding the management of the liquid used or the quality assurance of processed products.

Claims (1)

[Scope of Claims] 1. A water-soluble metal working fluid characterized by containing gum turpentine. 2. The water-soluble metal working fluid according to claim 1, which contains 5 to 90% by weight of gum turpentine. 3. The water-soluble metal working fluid according to claim 1 or 2, which contains an emulsifier.