JPS587492A - Novel aqueous working fluid - Google Patents

Abstract

PURPOSE:A novel aqueous solution type working fluid, containing a specific water-soluble amine soap in a specific amount as a lubricating oil component, and having improved lubricity and rust preventing property and a low frothing property. CONSTITUTION:An aqueous working fluid containing 0.2-5wt% water-soluble amine soap compound obtained by neutralizing (A) one equivalent fatty acid containing 50wt% or more 8-12C fatty acid with (B) 1-4mol preferably 1.05-2.0mol, amine. Preferred examples of the component (A) contain 50wt% or more caprylic acid, capric acid or lauric acid. Ethanolamine, ethylamine, morpholine, etc. may be cited as the component (B).

Description

[Detailed description of the invention] Ru.

More specifically, the present invention relates to an aqueous hydraulic fluid containing a specific amine soap compound as a lubricant component.

Flame-retardant hydraulic fluids conventionally used in hydraulic equipment in places where there is a risk of fire include phosphate ester, fatty acid ester, water-glycol, and emulsion fluids. Among these, water-based aqueous lid hydraulic fluids are attracting the most attention due to their fire resistance, but recently, liquids containing large amounts of water have been developed from the viewpoint of not only fire resistance but also resource conservation and environmental conservation. New hydraulic fluids are currently being considered.

In other words, conventional water reservoir hydraulic fluids, with the exception of some soluple hydraulic fluids, have a water content of around 110%, whereas high water content hydraulic fluids (HWBF) have a water content of 5% or more.
is being explored.

Two types of high-water content hydraulic fluids are considered: Solution A and emulsion type, but in both cases, problems such as stability, foaming properties, and rust prevention properties arise due to the high water content. Become. For example, in the case of an emulsion type, there is a method of emulsifying water-insoluble lubricant components such as mineral oil with an emulsifier, as in the case of conventional emulsion lid hydraulic fluids, but if a large amount of water is present, it is extremely difficult to keep the fluid stable. - [It is difficult and tends to cause liquid separation, and when the liquid separates, it rapidly loses its slipperiness and causes filter clogging.

In addition, the use of surfactants as emulsifiers tends to cause cavitation, and various antifoaming agents have been studied to suppress this foaming.
In fact, at present, there are almost no antifoaming agents that maintain their effectiveness.

The present inventors have attempted to improve the above-mentioned drawbacks (as a result of various studies, we have found that by using a specific amine soap compound as a lubricant component, a solution type with excellent lubricity and rust prevention properties, as well as low foaming properties) can be achieved. We have completed the Mizusei Explosive Liquid.

That is, the aqueous leakage hydraulic fluid of the present invention has carbon atoms of 1, 1
Aden Ill/, 0NI1. This is a novel aqueous hydraulic fluid characterized by containing 1 to 1 weight arc of a water-soluble amine soap compound produced by neutralizing θ moles. This amine soap compound is soluble in water and has a
In addition to being a lv agent component, it also has low foaming properties and antirust properties.

The 712 soap compound contained in the hydraulic fluid of the present invention can be obtained by a neutralization reaction between a fatty acid containing a fatty acid having a carbon number of 1-/J or more and an amine. The number of carbon atoms in the fatty acid component has an important relationship with the lubricating properties and low foaming properties of the hydraulic fluid in the present invention.
It is necessary that the fatty acid contains more than 0 weight of fatty acids with less than 1 carbon number, and the fat that contains many fatty acids with less carbon number @e! 1! If a fatty acid containing a large number of fatty acids with a larger number of carbon atoms is used, sufficient lubrication properties cannot be obtained, and if a fatty acid containing a large number of fatty acids having a larger number of carbon atoms is used, sufficient low foaming properties cannot be obtained. This fatty acid component may be a straight chain, a split chain, or one with an unsaturated bond, but it is preferably a straight chain saturated bond fatty acid, such as caprylic acid, capric acid, lauric acid alone or 3 of the mixture
Fatty acids containing 0% by weight or more are good.

In addition, the amines may be alkanolamines such as monoethanolamine, jetanolamine, triethanolamine, monoincubanolamine, or monoethylamine, diethylamine, etc., as long as the obtained 712 soap is water-soluble. , n-propylaone, and also cyclic amines such as morpholine. These may be used alone or in a mixture of several types.

The reaction molar ratio of fatty acids and amines when producing fat soap compounds is important; It is necessary to prepare 21 moles or more and less than damol, preferably with respect to fat #/equivalent.
, Oj~ko, 0 mole.

The neutralization reaction between a fatty acid and an amine may be carried out by a conventional method, for example, the amine may be added to the fatty acid, or the amine may be added in the reverse order.

The aqueous hydraulic fluid of the present invention has an essential condition that the above-mentioned amine soap compound is used as a lubricant component and a rust preventive component in an amount of 0.2 to 3% by weight, preferably 0.2 to 3% by weight.
), in addition to this, other base materials can be added to the working fluid to provide the properties of 0, such as thickeners, pour point depressants, pHml1 agents, antioxidants, sequestering agents, etc. The 712 soap compound used in the present invention acts as a lubricant, rust inhibitor,
It exhibits lll1w properties, anti-wear properties, and anti-corrosion properties, but in order to further improve these properties, oiliness improvers, extreme pressure agents,
Rust inhibitors can be added.

Examples of the binder to be added include polyoxyalkylene glycol compounds, urethane compounds obtained by crosslinking polyoxyalkylene glycols with isocyanates, water-soluble cellulose derivatives such as hydroxyethyl cellulose, polyvinyl alcohol, and polypyrrolidone.

Examples of point depressants include glycol monoalkyl ether compounds such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol natonochrycol, methyl calpitol, ethyl calpitol, ethyl cellosolve, and butyl cellosolve. Possible ・As a pH adjuster, there are general adjuncts, etc. As an anti-stirrup agent, there are mercaptobenzothiazole, benzotriazole, etc. As a metal sequestering agent, there are aminocarboxylic IM and its metal salts, such as etherenediamine ginseng, vinegar, etc. can be mentioned.

In general, the rust preventive properties and lubricity of the hydraulic fluid of the present invention are to be improved. First, as a rust preventive agent, an additive such as triethanolamine, jetanolamine, morpholine, cyclohexylamine, and jetanolcyclohexylone is used. Examples include alkali salts of carboxylic acids, alkali salts of phosphoric acid, and the like.

Examples of agents that improve lubricity include oiliness improvers such as carboxylic acid esters and alkali salts, and extreme pressure agents such as phosphorus compounds and ionic compounds. The 712 soap compound used in the present invention is particularly useful in high-wood-containing hydraulic fluids (HWBF), which have a high water content (as shown in the foregoing description), but is particularly useful in water-formed hydraulic fluids with a low water content. It is also useful in SaraK.

There is no problem if it is prepared in a small amount of water and diluted with water before use.

Next, the present invention will be described in more detail with reference to Examples, but the present invention should not be limited thereto.

I Preparation of amine soap compound A, intermediate fatty acid with neutralization value of 340 (caprylic acid!j%, turnip")">11144j%, 5'>IJ:y
@ J%) (Kao Sekiwasha Goku) /! ! 9C1 mol) and jetanolamine, t a, s 51 (o, 1 mol n)
-Propylamine 9jl ((1), 3 mol) and morpholine amine JJj (O, 3 mol) were combined to obtain a brown viscous liquid amine soap compound -toz. This is referred to as amine soap compound A used in the present invention.

B, Coconut mG Prill #171 Caprin 1 with neutralization value -6t
1.7%, Laurin m! fO Attack, ilisten II! zt
%, palmitic acid de whisper, oleic acid j%, pas/ittu olein l! J%, stearin #I1%) (manufactured by Kao Soap Co., Ltd.) ioda, jj (0.1 ml) and triethanol
Luain 4I da, 7ji (0.3 mol) and Morpholinco b, / jl (0.3 mol) were mixed to obtain a brown viscous liquid amine soap compound /ts, J I. This is referred to as amine soap compound B used in the present invention.

C, neutralization value -10 laurin # (capryl aI/rumor, caprile III/41%, laurin #70%, ilisten al/j%) (manufactured by Kao Soap Co., Ltd.) 1001 (o, r mol) and jetanol Amine! IJ (0.3 mol),
A brown viscous liquid amine soap compound tl/Jli was obtained by mixing with 9 g (o, r mol) of n-phyllobyl parakeet. This is referred to as amine soap compound C used in the present invention.

D, middle N price J co! Caplin 11! (Capryl fist 7%,
Capricorn, Laurin@*%) (manufactured by Kao Seki-sha)
l wolfberry 1/(i, o mol) and jetanol azun j koj
l (OJ mol), triethanolane e 41,7
y (θ, J mole containing morpholinco!, / j (0,
3 mol) and mixed with 712 soap compound 9 to form a brown viscous liquid. 0. :I got $19. This is the amine soap compound used in the present invention.

E, neutralization value co-SO myristic # (capric acid 3%, lauric #//%, neristenic acid jj%, palzuthenic acid 1
%) (manufactured by Kao Soap Co., Ltd.) // Coj (O, j-E-ya) and diethanolocyamine, 5 N (o, r mol), n-
mixed with probylamine covy (o, r mol),
A brown viscous liquid amine soap compound/lJ, j9 was obtained. Compare this to amine soap compounds? shall be.

? , oleic acid with neutralization value -〇- (unsaturated fat-interfering acid fJ%,
Saturated fat #11%) (manufactured by Kao Soap Co., Ltd.) / J 9 j
(01 mol) and triethanol ν amindada, rij (
0.3 mol), morpholinco4. / j (0, J moji) and f: mixed to form a brown viscous liquid amine soap compound Co09. I got JF. This is referred to as comparative amine soap compound V. Physical property evaluation of 712 soap aqueous solution 712 soap compound A prepared in 9 and used in the present invention
-Comparison with D: The physical properties of a 1% by weight aqueous solution of F were evaluated for the amine soap compound.

The results are shown in Table No.

To measure the foaming property, take 1 liter of aqueous solution and tm/ in a measuring cylinder of t00 m/ and shake the SO vigorously up and down with one hand.
After shaking and standing, the volume of foam was measured. Are there foam shoes in table l? o m/ 5 indicates the cylinder [[] The friction coefficient was measured using a pendulum tester.

In the defense test, a steel plate was attached and placed in a constant temperature bath at 30°C to determine the number of days until rust appeared.

As is clear from Table 7, the amine soap compounds A-D used in the present invention are different from the comparative amine soap compounds E and F.
It can be seen that it is superior in terms of low foaming properties, lubricating properties, and rust prevention properties.

■ Preparation of water-molded working waves Amine soap compounds prepared in summer ~C and amine soap compounds of comparative examples? A water-molded working wave containing no lubricating component was prepared as a blank according to the recipe shown in Table 0. All amounts in Table 0 indicate parts by weight.

The thickener in Table 1 is a water-soluble polyoxyalkylene glycol (average molecular weight: soooo.

Asahi Denka II), the phosphorus-based extreme pressure agent is a phosphate ester-based extreme pressure agent (manufactured by Asahi Denka), and the anti-oxidant is an amine-based rust preventive, a phosphate-based rust preventive, and benzene. A mixture of triazoles was used.

■ Performance evaluation of water-formed working waves Abrasion resistance tests were conducted on the hazardous water-formed hydraulic fluids I to E prepared in the summer using a Shell-tei ball tester and a vane pump. And 7
The test was carried out for 5 minutes, and the wear marks were measured.The vane pump test was conducted using a Vickers vane pump Y-IOZC.

Discharge pressure j Okg/cya”, shaft rotation speed/JOO
The machine was operated for 30 hours at rpm and liquid temperature of EO°C, and the amount of wear on the vane and cam ring was measured.The results are shown in Table JK.

As is clear from Table J, the hydraulic fluids 1, 1, and 2 of the present invention have superior wear resistance compared to the comparative hydraulic fluids 2 and 5.

6

Claims (1)

[Claims] A water-soluble amine soap obtained from a fat containing at least SO weight % of a fatty acid having a number of carbon atoms of g to /- and a total of 7 to 50% of the total weight of carbon atoms. - An aqueous reservoir hydraulic fluid containing ~S weight arc.