JP4974150B2 - Water-soluble processing oil - Google Patents

Description

The present invention relates to a water-soluble processing oil used in cutting and grinding of metals, ceramics, and glass.

Oils widely used in the fields of cutting and grinding include water-insoluble oils containing mineral oil and water-soluble oils containing mineral oil, surfactants, organic amines, etc. and diluted with water. As the water-soluble cutting fluid and the water-soluble grinding fluid, individual fluids were used according to the processing contents. However, from the viewpoint of preventing deterioration of the global environment or saving resources, there has been a demand for the development of oils that have a lower environmental impact than conventional oils and that can be used for as long as possible. Furthermore, with the recycling in mind, there has been a demand for an oil that can be used for both cutting and grinding.

Therefore, synthetic metalworking fluids that do not contain mineral oil, have excellent rot resistance, and can be used for a long time have been proposed. Synthetic-type (water-soluble) metalworking fluids are composed of components that are completely soluble in water and can be completely washed with water, so that they have excellent detergency and are also effective in improving the workplace environment. As such a water-soluble metalworking fluid, for example, a lubricant composition (for example, Patent Document 1) using a polyoxyalkylene glycol compound is known.

Furthermore, in recent years, it has been desired to suppress / prevent a reduction in the life of machining tools from the cost aspect, to reduce machining defects, and to improve the machining speed from the production aspect.
For suppressing / preventing the reduction in the life of machining tools, for example, a very small amount of oil of about 1 / 100,000 to 1 / 10,000,000, compared with the amount of oil used in normal cutting / grinding, is used together with the compressed fluid. New processing types such as an ultra-trace oil supply type (Patent Document 2) that performs cutting and grinding while being supplied have been developed. In addition, there are a method (Patent Document 3) in which a barrier layer is provided on the surface to prevent welding between the bite composition and the work material, and a report (Patent Document 4) in which the blade tip structure is improved to prevent a decrease in life.
On the other hand, as processing oil, there is a report (Patent Document 5) that improves extreme pressure lubricity using a sulfur-based extreme pressure agent and a surfactant as constituent components.

In water-soluble processing oils, organic amines are generally used as preservatives or rust preventives, and primary amines, secondary amines or tertiary amines are used, especially tertiary amines and other amines. It has been reported that a combination with an amine is preferable (Patent Document 6).
). In addition, it is known that polyacrylamide derivatives can prevent wear and are used together with organic amines (Patent Document 7), but can further prevent deterioration of rust prevention and antiseptic properties and the life of processing tools. There is a need for a water-soluble processing oil that can reduce processing defects.
Japanese Patent Laid-Open No. 10-324888 WO02 / 081605 pamphlet Japanese Patent Laid-Open No. 7-75902 JP-A-8-39306 JP 2005-187650 A JP-T-8-503726, JP-A-8-504465, JP-A-2002-285186, 2005-89570, 2006-265409 Japanese Patent Application Laid-Open Nos. 7-179876, 2005-516809, and 3-501267

The present invention suppresses a reduction in tool life during cutting using a carbide tip, a coating tip, or the like that uses a metal such as steel or alloy steel as a workpiece, and also provides a fixed abrasive such as glass. Provides grinding-type water-soluble processing oils that have high rust prevention, anti-corrosion properties, and low irritation to the skin while suppressing cracking and chipping of workpieces and high production efficiency. The purpose is to do.

As a result of research to solve such problems, the present inventors have found that a specific amount of a specific primary amine and secondary amine are blended in a specific amount , and that the problem can be solved by blending dicarboxylic acid and acrylic acid. Reached.
That is, the present invention
(1) containing primary alkanolamine and secondary alkanolamine in a weight ratio of 10:90 to 90:10 ;
And containing dicarboxylic acid and polyacrylic acid or a salt thereof,
pH is 9-10.5,
Synthetic water-soluble processing oil for metal or glass processing ,
(2) The synthetic water-soluble processing oil according to (1), wherein the dicarboxylic acid is a C 6-12 dicarboxylic acid,
Is to provide.

The water-soluble processing oil of the present invention reduces tool wear in metal cutting, reduces cracking and chipping in glass grinding, improves processing accuracy in cutting,
Low cost, high production efficiency, excellent rust prevention and resistance to spoilage. Good storage stability, long-term use, low skin irritation and good workability.

Hereinafter, the present invention will be described in detail.
The processing oil of the present invention comprises a mixing ratio of primary alkanolamine and secondary alkanolamine (
Parts by weight) of 10:90 to 90:10.
If the mixing ratio of the primary alkanolamine exceeds the range, the rust resistance against iron members will be reduced to pH.
It becomes difficult to maintain in the range of 9 to 10.5. On the other hand, if it falls below that range, it becomes difficult to maintain the rust prevention property in the range of pH 9 to 10.5 and achieve both stability. .
The total weight of the amine is 0.1 to 60 parts by weight, preferably 0.3 to 50 parts by weight. If the amount is less than 0.1 parts by weight, the rust-proof property is remarkably lowered. If the amount exceeds 60 parts by weight, the stability of the liquid may be deteriorated, which is disadvantageous in terms of cost.

Examples of the primary alkanolamine used include monoethanolamine, mono (iso) propanolamine, and monobutanolamine.
The secondary alkanolamine is specifically a dialkanolamine, which is diethanolamine, di (iso) propanolamine, dibutanolamine, monoethanol mono (
Examples thereof include iso) propanolamine, monoethanol monobutanolamine, mono (iso) propanol monobutanolamine and the like.
In addition, tertiary alkanolamines and cyclic amines can be used in combination as long as pH, rust prevention, and chemical stability are achieved. Tertiary alkanolamines include triethanolamine, triisopropanolamine, diethanolmonoisopropanolamine, diethanolmonoisobutanolamine, monoisopropanoldiisobutanolamine,
N-methyldiethanolamine and the like, and examples of cyclic amines include morpholine, N-methylmorpholine, piperazine and the like.

In the processing oil of the present invention, an acid is used as an amine neutralizer. Examples of acids used include acetic acid, propanoic acid, butanoic acid, pentanoic acid, hexanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, caproic acid, enanthic acid, capric acid, caprylic acid, undecanoic acid, undecylenic acid, Dodecanoic acid, tridecanoic acid, pentadecanoic acid, heptadecanoic acid,
Nonadecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid,
Behenic acid, isostearic acid, elaidic acid, oleic acid, linoleic acid, linolenic acid,
Lisinoleic acid, lactic acid, glyceric acid, malic acid, citric acid, hydroxylauric acid, hydroxymyristic acid, hydroxypalmitic acid, hydroxystearic acid, hydroxyarachidic acid, hydroxybehenic acid, hydroxyoctadecenoic acid, oxalic acid, malonic acid, succinic acid Acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, dodecyl succinic acid, lauryl succinic acid, stearyl succinic acid, isostearyl succinic acid, naphthenic acid, benzoic acid, paratertiary butyl benzoic acid , Organic carboxylic acids such as phthalic acid and salicylic acid, and phosphoric acid, phosphonic acid and sulfonic acid. Among them, monocarboxylic acids having 6 to 12 carbon atoms (hexanoic acid, caprylic acid, decanoic acid, lauric acid, etc.), dicarboxylic acids (eg azelaic acid, sebacic acid, dodecanedioic acid, etc.), or benzoic acid derivatives (t
(Et-butylbenzoic acid, hydroxybenzoic acid, etc.), phosphoric acid and phosphonic acid derivatives are preferably ethylenediaminetetramethylenesulfonic acid, hydroxyethanediphosphonic acid and the like.
These acids are 0.1 to 30 parts by weight, preferably 0.2 to 20 parts by weight. 0.1
If the amount is less than parts by weight, the rust-proof property is remarkably lowered. If the amount exceeds 30 parts by weight, the stability may be deteriorated, which is disadvantageous in terms of cost.

In the present invention, an acrylamide derivative or acrylic acid (and its alkali metal salt, amine salt) alone or a copolymer is further added.
Acrylamide derivatives or acrylic acid include (meth) acrylamide, N-methyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-acryloylmorpholine, N-isopropanol (meth) acrylamide, (meth) acrylic acid And metal salts such as sodium and potassium, and amine salts such as ethanolamine and diethanolamine.
The amount of these compounds alone or copolymer (polymer) added is 0.00001-10.
Part by weight, preferably 0.0001 to 1 part by weight is desirable. If the amount is less than 0.00001 part by weight, the effect of adding the polymer may not be obtained. On the other hand, if the amount exceeds 10 parts by weight, the viscosity of the adjustment liquid is increased, and the compatibility with other inclusions is reduced and stability is improved. Deteriorate.
These polymers can be used alone or in combination of two or more.

The water-soluble processing oil of the present invention includes conventional additives such as anti-corrosion additives, lubricants, surfactants, sequestering agents, antiseptics, antifoams, depending on the type of processing oil and the type of workpiece. Agents and extreme pressure agents can optionally be included.
Examples of the anticorrosive additive include silicate and benzenediamide, sodium metasilicate, sodium orthosilicate and benzotriazole. The anticorrosive additive is 1
A kind or two or more kinds can be used in combination.

  Examples of the lubricant include polyglycol compounds and phosphate esters.

Examples of the surfactant include nonionic hydrocarbon surfactants such as polyoxyethylene alkyl ether and carboxylic acid alkanolamide.

  Examples of the metal sequestering agent include phosphonic acid compounds and ethylenediaminetetraacetate.

Examples of the preservative include triazine-based, isothiazoline-based, phenol-based, formaldehyde donor system, thiadiazole-based compounds, and the like.

  Examples of the antifoaming agent include silicon-based and alcohol-based antifoaming agents.

The processing oil of the present invention may be used as it is, or prepared as a concentrated processing oil stock solution and diluted with water (tap water) before use. When it is used after diluting, it is preferably up to 100 times, and when it is used at a dilution ratio higher than that, the rust prevention property is remarkably lowered, and the machine and the processed member may be hindered.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further more concretely, this invention is not limited to a following example.
Test example 1
With the composition shown in Table 1, the stock solution of the processing oil was adjusted and tested for pH, rust resistance, and stability.
The results are shown in Table 1.

The test / evaluation methods in the table are as follows.
1. pH Test The pH at 20 ° C. of the stock solutions of Test Examples 1 to 5 and solutions obtained by diluting the stock solutions up to 100 times with tap water were measured and evaluated according to the following criteria.
○: pH 9 to 10.5
X: Less than pH 9 or more than 10.5 Rust prevention test (chip immersion method)
In a petri dish with a diameter of 90 mm, casting chips (dry cut, FCD450: 8-12 mesh)
) Weigh 15 g, add 20 g of each 60-fold diluted solution of Test Examples 1 to 5 and immerse. After 10 minutes, the solution was cut off and allowed to stand for 48 hours in an environment at a temperature of 25 ° C., and the rusting state was visually observed from the upper and lower surfaces and evaluated according to the following criteria.
○: Rust not present ×: Rust present Chemical Solution Stability 45 ml of each of the stock solutions of Test Examples 1 to 5 was placed in a 50 ml clear sample bottle, sealed and sealed at 0 ° C and 4
The sample was left in a thermostat at 0 ° C. for 1 month, and the presence or absence of precipitation of insoluble matter was evaluated according to the following criteria.
◯: No insoluble matter x: Insoluble matter present From Table 1, monoalkanolamine and dialkanolamine alone have a pH of 9 to 10.
In the range of 5, rust prevention and chemical stability cannot be achieved, but in combination with primary alkanolamine and secondary alkanolamine, pH is within the range of 9 to 10.5, and rust prevention and chemical stability It can be seen that all can be satisfied.

Example 1
Monoethanolamine 10 parts by weight, diethanolamine 30 parts by weight, dodecanedioic acid 20
Parts by weight, 0.05 parts by weight of polyacrylic acid (molecular weight: 250000), 0.3 parts by weight of polyethylene glycol (molecular weight: 600), 0.5 parts by weight of surfinol (485) are mixed to prepare a processing stock solution and processed The stock solution diluted 50-fold with tap water was used as the processing oil of the present invention, and the tool life during turning was evaluated.
Machining conditions are as shown in Table 2, and 20 roughing materials at one corner of the tool,
The tool life was evaluated by the amount of wear (μm) generated after 30 finishes were machined.
The results are shown in Table 3.
As a comparison, a product obtained by diluting a 40-fold solution of Solble type processing oil A with tap water was used as a processing oil (Comparative Example 1).

According to Table 3, it can be seen that the processing oil of the present invention has less wear than Comparative Example 1, and the tool life is about 1.3 times roughing and about 1.8 times finishing.

Example 2
Using the processing oil of the present invention produced in Example 1, the processing accuracy in chamfering polishing using a glass polishing wheel was evaluated.
The processing conditions are as shown in Table 4, and the defect occurrence rate (abnormal vibrations during processing, cracks and chipping) was evaluated according to the following criteria.
Judgment criteria (defect occurrence rate / number of machining steps 30): 0 to less than 5%, Δ: 5% to less than 10%, x: 10% or more The results are shown in Table 5.
In addition, as a comparison, a solution type processing oil commercial product B diluted 30 times with tap water (Comparative Example 2) and water alone (Comparative Example 3) were used as processing oils.

From Table 5, it can be seen that the processing oil of the present invention can suppress the occurrence of cracking and chipping in the polishing of glass.

As described above, the water-soluble processing oil of the present invention reduces tool wear in metal cutting, reduces cracking and chipping in glass grinding, and improves processing accuracy in cutting and grinding. Cost reduction, high production efficiency, good storage stability, long-term use, low irritation to skin, good workability, suitable for metal or glass cutting / grinding Can do.

Claims (2)

Containing a primary alkanolamine and a secondary alkanolamine in a weight ratio of 10:90 to 90:10 ;
And containing dicarboxylic acid and polyacrylic acid or a salt thereof,
pH is 9-10.5,
Synthetic water-soluble processing oil for metal or glass processing . The synthetic water-soluble processing oil according to claim 1, wherein the dicarboxylic acid is a dicarboxylic acid having 6 to 12 carbon atoms.