JPS585960B2 - Anti-corrosive water-soluble cutting fluid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-soluble cutting fluid used in cutting and grinding processes, particularly a water-soluble cutting fluid having anti-corrosion properties.

Generally, in cutting and grinding in machine work,
Cutting fluids are used to cool, lubricate, and prevent rust of tools and workpieces.

These cutting fluids are broadly classified into water-soluble and water-insoluble ones, but in the case of water-soluble cutting fluids, they mainly include mineral oil, chlorine, sulfur-based extreme pressure agents, surfactants, inorganic salts, and organic amines. The composition is blended according to the purpose of the work.

That is, these components and their blending ratio determine the characteristics of the water-soluble cutting fluid.

It is generally said that it is preferable for such a water-soluble cutting fluid to satisfy the following properties.

(a) Coolability: Lowers the cutting temperature to extend the life of cutting tools.

(b) Lubricity Reduces cutting resistance, prevents the formation of mechanical cutting edges, and improves the finished surface.

(C) Cleanability Improves the discharge of cutting powder and grinding powder,
Prevents clogging of grindstones, etc.

(d) Rust prevention Prevents workpieces, tools, and processing machines from rusting.

(e) Stability: No rotting or separation occurs.

(f) Others Does not attack the paint of the processing machine, does not have foaming properties,
In addition, it should not cause any adverse effects on the human body, such as smoke, odor, or generation of harmful substances.

However, currently commercially available water-soluble cutting fluids are
There is no such thing that can simultaneously and fully satisfy the above requirements.

In particular, the anti-corrosion and rust prevention properties have not been satisfactory since the addition of sodium nitrite was prohibited as a countermeasure against N-amines.

Water-soluble cutting fluids contain a large amount of components that are preferred by microorganisms such as anaerobic bacteria, such as surfactants and mineral oils. If an aqueous solution is left to stand, a variety of microorganisms will propagate within a week, or about two days in summer, resulting in decomposition and a foul odor.

This bad odor is commonly referred to as Monday's bad odor, and in this state, workpieces, tools, and even processing machines are susceptible to rust, requiring oil change, which is extremely uneconomical.

In order to prevent this type of spoilage, the cutting fluid industry has attempted to use cationic surfactants, which are widely used as bactericidal agents in the pharmaceutical field, as anti-corrosion agents; The use of cationic surfactants was abandoned after it was discovered that surfactants have a side effect of corrosiveness (rusting) to workpieces, tools, processing machines, etc., as well as strong foaming properties. Ta.

Based on this background, the present inventors tried again to apply cationic surfactants to water-soluble cutting fluids, and found that by using an appropriate amount of a specific cationic surfactant, rust prevention properties were impaired. It has been found that the anti-corrosion properties can be greatly increased without causing any damage.

That is, the present invention uses coconut alkyldimethylbenzylammonium chloride (RN
(CH8)2(CH2; C6H5>Cl, R=C12~
C13] and by adding 0.01 to 0.5 weight percent of this, water-soluble cutting material having excellent anticorrosion properties, rust prevention properties, and antifoaming properties, which is the object of the present invention, can be obtained. The aim is to provide an oil solution.

If the amount of coconut alkyldimethylbenzyl ammonium chloride is less than 0.01 weight ratio, it will not be effective as an anti-corrosion agent or bactericidal agent, and if it is more than 0.5 weight ratio, it will not have the cleaning performance necessary as a water-soluble cutting fluid. Rust prevention and antifoaming properties cannot be obtained.

By the way, the above-mentioned cationic surfactants themselves do not have a practically useful level of cleaning performance, and they also reduce the antifoaming properties of oils, so when using them in water-soluble cutting fluids, nonionic It is preferable to use a surfactant in combination.

As the nonionic surfactant, a sorbitan ester surfactant or a polyoxyethylene sorbitan ester surfactant can be used.

This type of nonionic surfactant acts as an emulsifier, stabilizing agent, solubilization promoter, and penetrating agent for lubricants (mineral oil, polyethylene glycol, etc.), and can improve the cleaning performance of water-soluble cutting fluids. can.

The nonionic surfactant can be appropriately selected within the range of 5 to 30 weight percent.

If it is less than 5 weight ratio, the necessary cleaning performance cannot be obtained, and if it is more than 30 weight ratio, the compositional balance with other additives will be lost.
It also inhibits the effects of cationic surfactants.

Note that when a nonionic surfactant is blended with a cationic surfactant, the efficacy of the cationic surfactant may decrease slightly, but in this case, EDT is used as an efficacy enhancer.
It is desirable to use A, an alkali polyphosphate, an alkali carbonate, or the like.

Alkali polyphosphates and alkali carbonates are themselves added to water-soluble cutting fluids as rust preventives and pH adjusters.

Next, preferred compositions of the anticorrosive water-soluble cutting fluid according to the present invention are listed.

(1) JIS Wl type (emulsion type) cationic surfactant 0.01 to 0.5% by weight Nonionic surfactant 5 to 30% by weight Mineral oil
The remainder is extreme pressure additive (S,
Ct type, etc.) 9-20 weight ratio non-ferrous metal corrosion inhibitor
small amount antifoaming agent
Small quantity (2) JIS W2 class (Solievre/
Type) Cationic surfactant 0.01-0.5% by weight Nonionic surfactant 10-25% by weight Lubricant (
Polyhydric alcohol) 7-15 weight rust preventive agent
5-20% by weight antifoaming agent
Small amount of water Remainder (3) JIS W3 type (solution type) cationic surfactant 0.01 to 0.5 weight Chinonionic surfactant 5 to 20 weight rust preventive agent
50-90 weight multi-nonferrous metal corrosion inhibitor
A small amount of water In the above composition, as the cationic surfactant, coconut alkyldimethylammonium chloride is used as the cationic surfactant, and as the nonionic surfactant, a sorbitan ester or polyoxyethylene sorbitan ester surfactant is used. Use.

Furthermore, conventionally used additives such as extreme pressure additives, oily agents (lubricants), antioxidants, and antifoaming agents can be used as appropriate.

Next, an experimental example of the water-soluble cutting oil according to the present invention will be shown in comparison with a commercially available product.

<Experimental example 1> (Wi species) The products of the present invention (1), (2), comparative products (3) and commercial products A and B shown in Table 1 were diluted 20 times with tap water and subjected to rotting using the corn method. Tests were conducted to compare anti-corrosion properties, rust prevention properties, etc.

Note 1: A 1:1 mixture of the product name Nissan Nonion LP-20R [sorbitan ester type (lauric acid ester)] and the product name Nissan Nonion ST-221 (polyoxyethylene sorbicun ester type (stearate ester)). (Both manufactured by NOF K.K.) Note 2: Product name Nissan Cation F2-so [Sarconium chloride type (coconut resin dimethylbenzyleammonium chloride)]
(manufactured by NOF K.K.) Note 3: Triethanolamine The general properties of each of the above samples are shown in Table 2, the properties after the rot test are shown in Table 3, and the sample (2) of the present invention and the sample (2)
Table 4 shows the comparison results of rust prevention and foaming tests with a comparison sample using the same amount (0.1% by weight) of hexadecyltrimethylammonium chloride (Nissan Cation PB300) in place of F2-50.

Note 1 The above spoilage test was conducted using the corn method.

More specifically, 2 pieces of corn flour in a 150nl bottle
Sr. and cast iron cutting powder 10rr. is added to 100 cm2 of a sample diluted to a specified ratio, sealed and stirred.

This is left at 40°C±2°C.

Observe and record the smell of putrefaction every day, and after 10 days have passed, check the presence or absence of oil separation and putrefaction odor. Can judge.

) is measured and recorded. In addition, according to experiments conducted by the present inventors, it has been confirmed that the corn method accurately simulates the results of a performance test in which water-soluble cutting fluid used in a machine factory is collected, sealed, and left. Ta.

<Experimental Example 2> (Type W3) Samples I to ■ whose compositions are shown below were diluted 50 times with tap water, 150 nl was placed in a 200 nl glass bottle, and 20 gr. , tighten the lid, seal, and continuously heat it to 30 to 35°C using a constant temperature bath, checking the presence or absence of putrid odor every day using a simple viable bacteria measuring device [trade name: Easicult-TTC]; Orion・
Orion Diagnos
tica) - Helsinki Finland (Helsin
A follow-up investigation of the growth status of live bacteria such as anaerobic bacteria was conducted using ki-Finland).

Sample I (commercial product) Sodium nitrite...10% by weight Triethanolamine...15% by weight Polyethylene glycol...2% by weight (molecular weight 400) Penzotriazole...0.5% by weight
...72.5% by weight sample■
(Adjusted product) Alkali polyphosphate...4.8% by weight Alkali carbonate...3.2% by weight Thidiethanolamine...32.4% by weight Triethanolamine...9.5% by weight Benzotriazole... 0.5 weight water
...49.4% by weight sample ■ (invention product) Sodium nitrite ...10% by weight Triethanolamine ...15% by weight polyethylene glycol 2% by weight (molecular weight 400) Penzotriazole (Note 1) ・...0.5% by weight Nissan Cation F2-50 ...0.1% by weight water
...71.5% by weight sample ■ (product of the present invention) Alkali polyphosphate ...4.8% by weight Alkali carbonate ...3.2% by weight Diethanolamine ...32.4% by weight Triethanolamine...・9.5% by weight Penzotriazole (Note 1) ...0.5% by weight Nissan Cation F
2-50...0.1% water by weight
...49.3% by weight Note 1: Trade name of coconut alkylmethylbenzolammonium chloride (NOF K
．． K. ) The properties of the above samples I to (2) are shown in Table 5, and Table 6 shows the results of the rot test.

Table 7 also shows sample (1) according to the present invention and the same amount (0.1% by weight) of Nissan cation F2-50 in sample (2).
) of hexadecyltrimethylammonium chloride (
The results of comparison with a comparative sample using Nissan Cation PB300) are shown.

The drawings show changes in the number of viable bacteria for each of the samples 1 to ①.

The above test results all indicate that the water-soluble cutting fluid according to the present invention has extremely superior anti-corrosion properties compared to conventional products.

In addition, as is clear from Table 3, the product of the present invention is superior to conventional products in terms of rust prevention, and is not inferior to conventional products in terms of cleanability and foaming properties (Tables 2 and 5). reference).

[Brief explanation of drawings]

The drawing is a graph showing the results of the spoilage test for products (1) and (2) of the present invention, commercially available products I, and prepared products H.

Claims (1)

[Scope of Claims] 1. A water-soluble cutting oil containing an extreme pressure agent, an oil-based agent, an antioxidant, a rust preventive agent, an antifoaming agent, a surfactant, etc. as necessary, as a surfactant, An anticorrosive water-soluble cutting fluid characterized by adding 0.01 to 0.5 weight percent of cationic coconut alkyldimethylbenzyl ammonium chloride. 2. Water-soluble cutting oil containing extreme pressure agents, oil-based agents, antioxidants, rust preventives, antifoaming agents, surfactants, etc., as required, containing cationic coconut alkyldimethylbenzyl as a surfactant. Anti-septic properties characterized by the addition of 0.01 to 0.5% by weight of ammonium chloride and 5 to 30% by weight of nonionic sorbitan ester type lauric ester or polyoxyethylene sorbitan ester type stearate ester. Water-soluble cutting fluid.