JPS5821488A - Aqueous hydraulic liquid composition - Google Patents

Abstract

PURPOSE:To provide the titled composition having no corroding and foaming properties and capable of keeping the lubricating property for a long period, by adding an oxyalkylene adduct of a sorbitan ester constaining a specific acyl group, and a compound represented by a specific formula as essential components to water. CONSTITUTION:The objective hydraulic liquid can be prepared by mixing 90- 99pts.wt. of water with preferably 1-10pts.wt. of (A) a compound obtained by adding 1-20mol of an oxyalkylene (preferably oxyethylene and/or oxypropylene) to 1mol of a sorbitan ester having 16-20C acyl group (preferably polyoxyethylene oleic acid ester) and (B) a compound represented by formulaI, formula II or formula III (R<1> is 8-20C alkyl; R<2> is ethylene or propylene; n1+n2 is 1-7; m1+m2+m3 is 1-7), as essential components.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-based hydraulic oil, and more particularly to a hydraulic oil that contains water as a component and does not cause rust or foaming.

Conventionally, mineral oil has been used as the hydraulic fluid, and petroleum is the main raw material, and mineral oil having a temperature of about 38 centistics at 40° C. is widely used. However, in recent years, it has been recognized that petroleum resources are limited, and measures to counter their depletion have been taken into consideration, and a change in raw materials for hydraulic fluids is also required.

Hydraulic oil must be a liquid due to its nature, and the most abundant liquid resource is water.

However, even if water is used as hydraulic fluid, it causes rust on the metal, foaming occurs when a rust preventive is added to water, and the viscosity becomes too low to maintain an appropriate viscosity, so it is still not practical. It is not something that can be provided.

The inventors of the present invention have made extensive efforts to solve this problem and use water as a hydraulic oil. As a result, they have found that by adding a substance with a specific chemical structure to water, it becomes possible to create water and use it as a constituent component. This led to the discovery and completion of the present invention.
. .

That is, the present invention combines a 71 to 20 mole oxyalkylene adduct of a sorbitan ester having an acyl group having 16 to 20 carbon atoms with the following general formula (in the above formula, R1 is a saturated or unsaturated alkyl group having 8 to 2 o carbon atoms, and W is a saturated or unsaturated alkyl group having 8 to 2 carbon atoms; An aqueous hydraulic oil composition prepared by adding a compound represented by an ethylene group, a propylene group, or a mixture thereof (n, +n2 represents 1 to 7, ~10 m2 + m3 represents 1 to 7) to water as an essential component. It is.

In the present invention, the oxyalkylene of the sorbitan ester is preferably oxyethylene, oxypropylene, or a mixture thereof, and the acyl group in the present invention may be of any type as long as it has a carbon number of 16 to 2 degrees. Preferably, those contained in Preferred examples of these potatoes include polyoxyethylene oleate, polyoxyethylene beef tallow fatty acid ester, and the like. Further, the sorbitan ester, amide, and amine in the present invention are produced by a generally known method, and the addition of oxyalkylene is also performed by a generally known method.

The compound thus obtained is used by adding it to water, and is usually used in an amount of 1 to 10 parts per 90 to 99 parts of water.

The aqueous hydraulic fluid of the present invention may further contain known rust preventive agents, antifoaming agents, and extreme pressure agents within limits that do not contradict the purpose of the present invention. As the rust preventive agent, for example, alkenylsuccinic acid, etc. are used, as the antifoaming agent, silicone oil, etc. are used, and as the extreme pressure agent, dialkyl dithiophosphate zinc salt, etc. are used, and the blending amount of each of these is 0.00% in the hydraulic oil. 01-5
Weight percent is preferred.

Furthermore, the aqueous hydraulic oil according to the present invention is stable, with a viscosity maintained at around 38 centistics at 40°C;
If the viscosity decreases due to long-term use, a viscosity stabilizer can be used in combination. As the viscosity stabilizer, for example, tertiary butylbenzoic acid can be used.

In this way, the present invention has made it possible for the first time to use water as a component of hydraulic fluid. The hydraulic oil according to the present invention has a range of 70 Kf/m" to 200 Kg/am'
Its viscosity remains stable for long periods of time even under high pressure, and it functions as a hydraulic fluid.It does not cause rust on metals even if water is the main component, and is resistant to oxidation due to oxygen in the air. It is also heat stable and retains its lubricating performance for a long period of time.

The present invention is the first to provide such an excellent hydraulic oil. The present invention will be explained in more detail with reference to Examples below.

Example 1 A hydraulic fluid was produced by blending these components according to the following composition.

Polyoxyethylene (3 moles added) 6% by weight of rubitan tripalmitate, 1.5% by weight of zinc dialkyldithiophosphate (extreme pressure agent), 5% by weight of alkenylsuccinic acid having 12 carbon atoms (rust inhibitor) Silicone oil (antifoaming agent) o, 5% water by weight
The 91.5% by weight hydraulic fluid had a viscosity of 38 centistokes at 40°C. Using this hydraulic oil, a Vickers 104 Peinbow was operated for 200 hours at 40°C±5°C. After the operation, the viscosity at 40°C was measured and found to be 37.8 centistokes, and the weight loss of the cam ring 0 vane was 60 cm, which was almost unchanged.

Example 2 When beef tallow fatty acid triester of polyoxyethylene sorbitan was used instead of polyoxyethylene sorbitan tripalmitate in Example 1, the viscosity of the hydraulic oil was f140.
It was 38.1 centistokes in degrees Celsius. Using this hydraulic oil, a Vickers 104 vane pump was operated at 401°C±5°C for 200 hours. When the viscosity was measured at 40°C after the end of the operation, it was 37.8 centistokes, and the weight loss of the cam ring 0 vane was 573 cm, which was almost unchanged.

Comparative Example 1 When polyoxyethylene (additional mole number 3) monostearate was used instead of polyoxyethylene sorbitan tripalmitate in Example 1, the viscosity at 40°C fl 3
It was 0.7 centistokes. Using this hydraulic oil, it was operated for 2400 hours at 40°C±5°C using a Vickers 104 barrel/pump. The viscosity at 40°C is 25.
7 centistokes, and the weight loss of the Camring spring vane was 7.72 gf.

Example 3 A hydraulic oil was manufactured using the following formulation.

Oleic acid jetanolamide 5.5% by weight Zinc salt of dialkyldithiophosphate 1.5〃Silicone oil 0.5〃Water
, 37 The viscosity of this hydraulic oil was 381 centistokes at 40°C. Using this hydraulic oil, a Vickers 104 vane pump was operated for 200 hours at 70 atmospheres and a flow rate of 22 t/min. After the operation was completed, the viscosity ft was measured at 40°C and it was 37.7 se/stokes, and the weight loss of the cam ring vane was 5.
There was almost no difference from 011jll.

Example 4 In Example 3, lauric acid monoethanolamide was used instead of oleic acid jetanolamide. It was 38 centistokes at 40°C. Using this hydraulic oil, a Vickers 104 vane pump was used at a pressure of 70 atm and a flow rate of 2.
It was operated for 200 hours at 2 t/min. After driving 4
The viscosity at 0° C. was measured to be 377 centistokes, and the weight loss of Kamling Ba/ was 51~, which was almost unchanged.

Example 5 In Example 3, propatoolamide oleate was used instead of jetanolamide oleate. 3 at 40℃
It was 8.1 centistokes. Similarly Vickers 1
Using 04 vane pump, 70 atm, flow rate 22t/min
The viscosity at 40°C after 200 hours of operation was 37.
6 centistokes, and the weight loss of Kamling Vane was 49 g/g - not much different.

Example 6 A hydraulic oil was manufactured using the following formulation.

Oleylaminated ethylene 5 mole adduct 5% by weight
Para-tertiary butylbenzoic acid triethanolamine salt
21 Dialkyl dithiophosphate zinc salt 1 Silicone
01 Water
91.9/F This hydraulic oil had a viscosity of 38 centistokes at 40°C. Similarly, using a Vickers 104 vane pump, 70 atm, 22 t/m
The viscosity at 40° C. after 200 hours of operation at a flow rate of 1.5 in. was 37.6 centistokes, and the weight loss of the reed, cam ring, and vane was 50 m17, which was almost unchanged.

Example 7 A hydraulic fluid was produced in exactly the same manner as in Example 6 except that a 5-mol oxyethylene adduct of N tallow alkylpropylene diamine was used instead of the oleylamine ethylene oxide adduct. The viscosity at 40°C was 38 centistokes. Similarly, using a Vickers 104 vane pump, 70
After operating for 200 hours at atmospheric pressure and a flow rate of 22 t/min, the viscosity at 40°C was 37.6 centistokes, and the weight loss of the cam ring vane was 50 cm, which was almost unchanged.

Patent applicant: Kao Soap Co., Ltd. Agent Mochizuki Keibu Procedural correction letter (voluntary) Commissioner of the Patent Office Shima 1) Itsuki Haru Display of incidents Patent Application No. 119652, 1982 2. Name of the invention Water-based hydraulic oil composition 3. Person who makes corrections 2-1-3 Bunka, Sumida-ku, Tokyo Detailed description of the invention in the specification 6 Contents of amendment (1) Regarding general formula (11) on page 3, line 13 of the specification\ (R20-□H”) \ (Corrected to u2ot7HJ.

Claims (1)

[Scope of Claims] 1. A 1-2 mmol oxyalkylene adduct of a sorbitan ester having an acyl group having 16 to 20 carbon atoms and the following general formula (in the above formula, R1 is a saturated or unsaturated sorbitan ester having 8 to 20 carbon atoms) Alkyl group % R' is an ethylene group, a propylene group, or a mixture thereof, nl+n2 is 1 to 7, ml+Inz+fn3 is 1 to 7). An aqueous hydraulic oil composition that is added to water as a component. 2. The aqueous hydraulic oil composition according to claim 1, wherein the oxyalkylene is oxyethylene, oxypropylene, or a mixture thereof.