JPH0216192A - Base for water-soluble metal working fluid - Google Patents

Abstract

PURPOSE:To alleviate putrefying tendency and maintain stable lubricating properties for a prolonged period of time by using as a base oil or an oiliness improver a carboxylic acid ester of bis-4-(2-hydroxyetyhyloxyethylamino) cyclohexylmethane. CONSTITUTION:An ester prepared from a 2-20 C straight-chain or branched aliph satd. or unsatd. carboxylic acid (e.g., 2-ethylhexylic acid) or an arom. carboxylic acid (e.g., benzoic acid) and bis-4-(2-hydroxyethyloxyethylamino) cyclohexylmethane (e.g., Wondamine HE-40 of New Japan Chemical Co., Ltd.) is used as a base for a water-soluble metal working fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a water-soluble metalworking fluid base with excellent corrosion resistance.

[Prior Art and Problems] Water-soluble metal working fluids are metal processing fluids made by using naphthenic or paraffinic mineral oils, synthetic oils, or ester compounds as base oils and emulsifying or solubilizing them with appropriate surfactants. They are roughly divided into emulsion-type oils, which become cloudy when diluted with water, and soluble oils, which become transparent or translucent when diluted with water.

Depending on the purpose, such water-soluble metal working fluids may contain oiliness improvers such as polyolefin oils, vegetable oils, animal oils, higher fatty acids, higher alcohols, amines, metal soaps, etc.
Rust preventive agent, preservative, rust prevention/preservative I! Various additives such as regulators, extreme pressure additives, antioxidants, and antifoaming agents are appropriately blended.

In recent years, there has been a desire to improve the workplace environment, prevent fires, promote rationalization to save resources and costs, and improve cooling performance to accommodate faster processing speeds. The superiority of metalworking fluids is beginning to be emphasized, and their usage is increasing.

However, water-soluble metalworking fluids generally tend to spoil when used for a long period of time, and as a result,
This can cause the generation of bad odors, a decrease in the performance of the oil, corrosion of machine tools and workpieces due to acidification of the oil, generation of rust, and clogging of pipes due to bacterial cells and extracellular substances. Furthermore,
Changes in the appearance of the oil agent (breakage of emulsion, separation of oil and water,
It may also cause the liquid to become cloudy, sticky substances to form, etc.).

This may be caused by microorganisms in the soil, air, diluted water, or other oils used together (e.g., hydraulic oil, lubricating oil, anti-rust oil).
This is caused by the contamination of microorganisms present in the oil, that is, bacteria such as aerobic bacteria, facultative anaerobic bacteria, and anaerobic bacteria such as sulfate-reducing bacteria, yeast, and filamentous fungi. These microorganisms proliferate particularly actively during hot and humid seasons or when machines are continuously stopped.

One possible way to solve this problem is to replace the oil in a short period of time, but this approach has the problems of time loss and increased costs due to replacement work, as well as increased expense for wastewater treatment.

Also, methods have been proposed in which a disinfectant, a preservative, an alkanolamine, a pH improver such as potassium hydroxide, sodium hydroxide, etc. are added. However, the addition of these drugs
New problems arise, such as the generation of chemical odors, decreased oil performance, increased toxicity, adverse effects on workers' skin, and reduced ease of treating wastewater.

Furthermore, methods for circulating oil even when the machine is stopped, and methods for forcibly aerating air and ozone (Japanese Patent Application Laid-Open No. 1983-1999-1) have been developed.
115697@), metal carriers or metal compounds thereof, etc.
Method of adding a substance having a preservative effect (Japanese Patent Application Laid-open No. 59-1
No. 87093, JP-A-61-62597, JP-A-61
-72098) or a method using polypropylene, polybutene, branched alkylbenzene, etc. as the base oil (Japanese Patent Application Laid-Open No. 61-62598).
It is hard to say that either method is a definitive solution.

[This is what the present invention seeks to solve;,! $! The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems caused by the contamination of water-soluble metal oils by microorganisms. (2) Ester compounds with a specific m structure are difficult to assimilate by microorganisms, and are base materials for metalworking oils. The present inventors have discovered that this material has excellent lubricity, and have completed the present invention based on these findings.

That is, the present invention uses an ester compound having a specific structure that can replace conventionally used animal and vegetable oils and has excellent lubricating performance in terms of oil property improvement performance as a base for corrosion-resistant water-soluble metal working fluids. The purpose is to provide it as a drug.

[Means for Solving the Problems] The water-soluble metal working fluid base according to the present invention has a carbon number of 2 to
B15-4-(2-hydroxyethyloxyedylamino)cyclohexylmethane (hereinafter [ It is characterized in that it is an ester consisting of Wondermin HE-404 (manufactured by New Nippon Rika ■, trade name) as an alcohol component.

Specifically, such esters include the diester of Wandamine)-IE-40 and isohexylic acid (hereinafter abbreviated as rW-6J), Wandamine 1-
Diester of IE-40 and 2-ethylhexylic acid (hereinafter abbreviated as rW-8(EH)J).

), Wandamine 11E-40 and isononyl acid diester (hereinafter abbreviated as rW-94), Wandamine HE-
40 and neodecanoic acid (hereinafter rW-104
It is abbreviated as. 〉, Wandamine HE-40 and myristic acid diester (hereinafter referred to as rW-14J), Wandamine HE-40 and oleic acid diester (hereinafter referred to as rW-18J), Wandamine HE-40 and benzoic acid Examples include diesters with acids (hereinafter abbreviated as FW-7(BA)J).

These ester compounds have good spoilage resistance under aerobic conditions and are resistant to biodegradation under anaerobic conditions.

Among these, esters containing a branched saturated fatty acid having 6 to 10 carbon atoms as an acid component are particularly excellent in this property.

Specific composition examples of water-soluble metal working fluid compositions prepared by applying the ester compound according to the present invention are shown below.

For example, an emulsion-type cutting fluid is composed of the following component composition.

Base oil (e.g. machine oil) about 45-75% by weight, oiliness improver (product of the present invention) about 5-30% by weight, extreme pressure additive O-50% by weight surfactant
Approximately 15-35% by weight, rust preventive agent O
- About 5% by weight, antioxidant about 0 - 1% by weight, antifoaming agent about 0-0.5% by weight, water about 0 - 10% by weight.

Further, an example of the composition of the soluble cutting fluid is as follows.

Base oil (e.g. machine oil): O ~ 25% by weight Oiliness improver (product of the present invention): approximately 5 ~ 30% by weight Extreme pressure additive: O ~ 20% by weight Surfactant
Approximately 20-80% by weight, rust preventive agent 5
-40% by weight Antioxidant O - about 1% by weight, Antifoaming agent about 0-0.5% by weight, Water O - 70% by weight Water The ester compound according to the invention is blended to form a water-soluble metal oil agent. Surfactants used in preparing the composition include:
Polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene
Polyoxypropylene condensates, sorbitan fatty acid esters such as sorbitan monooleate, nonionic surfactants such as fatty acid dialkanolamides, alkylbenzene sulfonates, alkyldiphenyl ether disulfonates, fatty acid metal salts, N-oleoyl sarcosine, etc. Examples include anionic surfactants such as sarcosinic acid derivatives, cationic surfactants such as carboxylic acid amine salts, and alanine-based amphoteric surfactants.

Furthermore, various additives that are commonly blended depending on the purpose are added to the metal oil. Specifically, phosphates, boroIIn, alkylamines, etc. as rust inhibitors, 1,2-benzinthiazolin-3-one, 2-methyl-4-inthiazolin-3 as disinfectants and preservatives, etc. Thiazole compounds such as -one, triazine compounds such as trishydroxyethyltriazine and hexahydrotriazine, other O-phenylphenols, sulfurized terpenes as extreme pressure additives, dibenzyl disulfide, dialkyl polysulfide, sulfurized olefins, sulfurized oils and fats. Sulfur-based compounds such as triaryl phosphates, triaryl phosphites, acidic phosphoric acid esters, acidic phosphoric acid ester amine salts, phosphorus-based compounds such as zinc alkyl dithiophosphate, halogens such as chlorinated paraffins, chlorinated fatty acid alkyls, etc. organic metal compounds such as lead naphthenate and lead dialkyldithiocarbamate, silicone compounds as antifoaming agents, organic amines as p)-111 stabilizers, alkali hydroxides, etc. as antioxidants. Examples include various additives such as di-tert-butyl-p-cresol.

Thus, the ester compound according to the present invention can be blended as a base oil or oiliness improver for water-soluble metalworking fluids, and can be used in cutting oils, grinding oils, polishing parts, rolling oils, press oils, handling oils, plastic working oils, and drilling oils. Consists of various water-soluble metal oils such as oil and wire drawing oil.

[Example] Hereinafter, the present invention will be described in detail with reference to Examples.

Examples 1 to 7 Seven types of ester compounds according to the present invention were evaluated for rot resistance under aerobic conditions, biodegradability under anaerobic conditions, and load-bearing capacity for lubricity evaluation. It was measured. The results obtained are listed in Table 1.

The rot resistance and lubricity of each ester were evaluated by the following methods.

Resistance to spoilage (1) Resistance to spoilage under aerobic conditions Add 2% polypeptone water (p
H = 7) 5m, and after sterilizing with pressurized steam at 120℃ for 20 minutes, the subject was placed in this for 0.2me (4, OV/V
%) and the following microorganism sources at 0.1 m (2.0 V/V%)
and culture with shaking at 25°C for 14 days. 0.05 d of an ether solution of 0.5% Sudan Black B is added to this culture solution to stain the remaining specimens that have not been decomposed and assimilated. This degree of staining is compared with the degree of staining of a blank experimental solution, and the rot resistance is evaluated on the following four levels.

◎: Not decomposed at all.

○: Slightly decomposed.

Δ: Significantly decomposed.

X: Completely decomposed.

The following four types of microbial sources were applied.

(1) Activated sludge used in sewage treatment plants (2) Pseudomonas bacteria that decompose butyl stearate (hereinafter referred to as “
It is abbreviated as BS assimilating bacteria. ) (3) Spoiled cutting oil waste collected at metal processing sites ■ Emulsion type cutting oil waste (hereinafter abbreviated as "E waste") ■ Soluble type cutting oil waste (hereinafter abbreviated as "S waste") (2 )Evaluated by rot resistance and biodegradability (%) under anaerobic conditions. In other words, sulfur with the following composition in a 500 precepts slope flask! A medium 59 for reducing bacteria and a test subject 59 are put therein, and after sterilization, a microorganism source 16d prepared by the following method is added.

The inside of the flask was replaced with carbon dioxide, and cultured with shaking at 30°C for 7 days. Thereafter, the test material remaining without being decomposed and assimilated by extraction with n-hexane is collected, its weight is measured, and the biodegradability (%) is calculated.

Here, biodegradability (%) refers to the percentage difference between the test weight before decomposition and the test weight after decomposition with respect to the test weight before decomposition.

Preparation of microorganism source> In a 500 m Sakaro flask, add bouillon medium 95 with the following composition.
rIJ! After sterilizing with pressurized steam at 120℃ for 20 minutes, putrefactive cutting oil waste collected at the processing site (-7x bacteria count)
106111iI/rrd1. pl-1=6.52)
A microorganism source (A) was prepared by adding 5rIII and culturing with shaking at 30°C for 2 days. In addition, a sulfur- and acid-reducing bacteria medium with the following composition was similarly cultured to obtain a microorganism source (B) of 1! I
%did. For the spoilage resistance test, an equal weight mixture of the above microbial source (A) and microbial source (B) was used.

0 Bouillon foil background composition (%) [pH=7.0] Bonito onyx 0.5 Polypeptone 0.5 Salt 0.25 Iron powder 2 0 Medium composition for sulfate-reducing bacteria (%) [pl-1=7.4] Potassium hydrogen phosphate 0.05 Ammonium chloride 0.1 Sodium sulfate 0.1 Calcium chloride dihydrate 0.01 Magnesium chloride heptahydrate 0.2 Lactic acid
0.25 yeast extract 0.1 fil ferrous iron heptahydrate 0.05 ascorbic acid 0.02 iron powder
2. Using a Soda type four-ball friction tester, use an advanced 3/4 inch ball (JIS B1501), vertical axis rotation speed 750 r
The load-bearing capacity was measured under the conditions of 1)m and a measurement temperature of 25°C.

Comparative Example 1 General-purpose machine oil (G-46> was used as a base oil, and its rot resistance, biodegradability, and load-bearing capacity were measured and evaluated according to the example. The obtained results are shown in Table 1. Raise it.

Comparative Examples 2 to 5 General-purpose butyl stearate (hereinafter referred to as IB) was used as an oiliness improver.
It is abbreviated as u-3tJ. ), polyolefin oil, vegetable oil, (rapeseed oil), and animal fat (beef tallow),
The rot resistance, biodegradability, and load-bearing capacity were measured and evaluated according to the examples.

The results obtained are listed in Table 1.

[Effects of the Invention] The ester compound according to the present invention is less susceptible to decay and has excellent lubricity than the base oil or oiliness improver of conventionally used metal working fluids. A water-soluble metal working oil composition containing the compound can maintain stable properties over a long period of time.

Patent applicant Shin [1 Hon Rika Co., Ltd.

Claims (1)

[Claims] 1. The acid component is a linear or branched aliphatic saturated or aliphatic unsaturated carboxylic acid having 2 to 20 carbon atoms, or an aromatic carboxylic acid, and Bis-4-(2-hydroxyethyloxyethylamino) A base for a water-soluble metal working fluid, characterized by being an ester containing cyclohexylmethane as an alcohol component.