(3) summary of the invention
The present invention, in order to make up the deficiencies in the prior art, provides synthetic hydraulic fluid that a kind of component is reasonable, thermal oxidation stability good, strainability is good, compatibleness is good, resistance to abrasion is good and preparation method thereof.
The present invention is achieved through the following technical solutions:
A kind of synthetic hydraulic fluid, comprises that the component of following weight percent is made: composite additive bag 1.45~6.0%, oil soluble polyalkylene glycol 60~90%, surplus is synthetic ester base plinth oil.
Described composite additive bag comprises oxidation inhibitor 0.8~3.0%, rust-preventive agent 0.05~0.5% and extreme pressure anti-wear additives 0.5~1.5%.
Described oxidation inhibitor is ashless aromatic amine oxidation inhibitor or Hinered phenols antioxidant, and resistance of oxidation is strong, can suppress oxidation of lubricating oil, reduces the generation of precipitation, paint film and greasy filth, thereby suppresses the growth of lubricating oil viscosity; Described rust-preventive agent is sulfonate (metal-salt is sodium, calcium, magnesium, zinc, barium etc.), organic amine or heterogeneous ring compound, in metallic surface, dipole and the metallic surface generation electrostatic attraction due to polar molecule forms physical adsorption for it, or the molecule of absorption and the chemisorption that chemically reacts of metal, can form in metallic surface molecule protective layer closely, prevent corrosion; Described extreme pressure anti-wear additives is organic sulfide extreme pressure anti-wear additives or Organophosphorous compounds extreme pressure anti-wear additives, under the condition of metallic surface ability to bear load, play the metallic surface of anti-skidding wearing and tearing, abrade the even effect of sintering.
Described composite additive bag also comprises non-emulsifying agent 0.1~1.0%.
Described non-emulsifying agent is cithrol or ethylene oxide-propylene oxide block copolymer, be adsorbed on oil-water interface, change oil-water boundary tension force, or be adsorbed on emulsifying agent and destroy hydrophile-lyophile balance, make emulsion oily water separation in phase inversion process.
Traditional polyethers base oil, is take oxyethane, propylene oxide, butylene oxide ring and tetrahydrofuran (THF) etc. as raw material, under catalyst action, and the simple linear polymer that open loop homopolymerization or copolymerization make.Oil soluble polyalkylene glycol of the present invention is not traditional oxyethane (EO) and propylene oxide (PO) homopolymerization copolymerized polymer, but by block polymerization, random copolymerization, the oil-soluble polymers that oppositely block makes, have the following advantages: viscosity grade is extensive, viscosity index is high, high temperature performance excellence, oil film strength is high, there is outstanding deposition control and equipment cleaning, be not hydrolyzed, use safety, and in elastomer compatibility, there is outstanding behaviours the aspects such as water absorbability, especially by alkoxylate chemical technology, improved the poor difficult problem of traditional polyethers base oil and other base oil intermiscibilities.Dissolubility polyalkylene glycol also has high biological degradation rate, is a kind of environmental protection base oil of high-quality.
Described synthetic ester base plinth oil is polyol ester basis oil, with the composite use of oil soluble polyalkylene glycol.
The preparation method of this synthetic hydraulic fluid, is characterized in that: comprise the steps:
(1) oil soluble polyalkylene glycol and synthetic ester base plinth oil is mixed, heated and stirred, mixes to obtain mixing oil A at 50~60 ℃ of constant temperature;
(2) in the mixing oil A making to step (1), add composite additive bag, under 50~60 ℃ of conditions of constant temperature, continue to stir 1~2h, make mixing oil B;
(3) mixing oil B step (2) being made filters under 0.1MPa~0.2MPa pressure, obtains limpid transparent synthetic hydraulic fluid.
The beneficial effect of synthetic hydraulic fluid of the present invention and preparation method thereof is: component is reasonable, there is suitable viscosity and viscosity-temperature characteristic, can active balance mechanical efficiency and volumetric efficiency, thermal oxidation stability is good, can effectively restrain the acidic substance and the greasy filth that in use procedure, by oxidation, are produced; Strainability is good, can meet the harsh requirement of the hydraulic efficiency system that precision is high, gap is little, controlling elements is complicated, can also meet hydraulic efficiency plant when working temperature and during start-up temperature for the requirement of liquid viscosity, viscosity-temperature characteristic meets the various needs that different purposes propose; And hydraulic efficiency system metal and sealing material are had to good compatibleness, demulsification resistance, air release property, resistance to abrasion etc. are functional; Owing to adopting the oil soluble polyalkylene glycol base oil of high biological degradation rate, make synthetic hydraulic fluid of the present invention also there is good environmental friendliness characteristic.
(4) embodiment
Below in conjunction with embodiment, the invention will be further described, but the present invention is not limited thereto, and the preparation method in embodiment is conventional preparation method, no longer describes in detail.
Embodiment 1:(is in double centner, as follows)
This composite additive bag, wherein sulfur-bearing 6.74%, phosphorus 3.38%, zinc 3.88%.
The preparation method of this synthetic hydraulic fluid, adopts following steps:
(1) the oil soluble polyalkylene glycol of above-mentioned weight and polyol ester basis oil is pumped into and is in harmonious proportion in Fu with toothed gear pump, heated and stirred, mixes to obtain mixing oil A at 60 ℃ of constant temperature;
(2) in the mixing oil A making to step (1), add the composite additive bag of above-mentioned weight, under 60 ℃ of conditions of constant temperature, continue mechanical stirring 2h, make mixing oil B;
(3) mixing oil B step (2) being made filters, and under 0.2MPa pressure, through the strainer that has filter bag device, filters, and obtains limpid transparent synthetic hydraulic fluid.
Embodiment 2:
This composite additive bag, wherein sulfur-bearing 6.5%, phosphorus 0.7%, nitrogen 3.2%.
The preparation method of this synthetic hydraulic fluid, adopts following steps:
(1) the oil soluble polyalkylene glycol of above-mentioned weight and synthetic ester base plinth oil are pumped into and are in harmonious proportion in Fu with toothed gear pump, heated and stirred, mixes to obtain mixing oil A at 55 ℃ of constant temperature;
(2) in the mixing oil A making to step (1), add the composite additive bag of above-mentioned weight, under 55 ℃ of conditions of constant temperature, continue mechanical stirring 1.5h, make mixing oil B;
(3) mixing oil B step (2) being made filters, and under 0.15MPa pressure, through the strainer that has filter bag device, filters, and obtains limpid transparent synthetic hydraulic fluid.
Embodiment 3:
This composite additive bag, wherein sulfur-bearing 7.5%, phosphorus 3.7%, zinc 7.8%.
The preparation method of this synthetic hydraulic fluid, adopts following steps:
(1) the oil soluble polyalkylene glycol of above-mentioned weight and synthetic ester base plinth oil are pumped into and are in harmonious proportion in Fu with toothed gear pump, heated and stirred, mixes to obtain mixing oil A at 50 ℃ of constant temperature;
(2) in the mixing oil A making to step (1), add the composite additive bag of above-mentioned weight, under 50 ℃ of conditions of constant temperature, continue mechanical stirring 1h, make mixing oil B;
(3) mixing oil B step (2) being made filters, and under 0.1MPa pressure, through the strainer that has filter bag device, filters, and obtains limpid transparent synthetic hydraulic fluid.
Embodiment 4:
This composite additive bag, wherein sulfur-bearing 6.5%, phosphorus 3.0%, zinc 2.7%.
The preparation method of this synthetic hydraulic fluid, adopts following steps:
(1) the oil soluble polyalkylene glycol of above-mentioned weight and synthetic ester base plinth oil are pumped into and are in harmonious proportion in Fu with toothed gear pump, heated and stirred, mixes to obtain mixing oil A at 55 ℃ of constant temperature;
(2) in the mixing oil A making to step (1), add the composite additive bag of above-mentioned weight, under 55 ℃ of conditions of constant temperature, continue mechanical stirring 2h, make mixing oil B;
(3) mixing oil B step (2) being made filters, and under 0.15MPa pressure, through the strainer that has filter bag device, filters, and obtains limpid transparent synthetic hydraulic fluid.
Embodiment 5:
This composite additive bag, wherein sulfur-bearing 9.2%, phosphorus 2.4%, zinc 5.2%.
The preparation method of this synthetic hydraulic fluid, adopts following steps:
(1) the oil soluble polyalkylene glycol of above-mentioned weight and synthetic ester base plinth oil are pumped into and are in harmonious proportion in Fu with toothed gear pump, heated and stirred, mixes to obtain mixing oil A at 60 ℃ of constant temperature;
(2) in the mixing oil A making to step (1), add the composite additive bag of above-mentioned weight, under 60 ℃ of conditions of constant temperature, continue mechanical stirring 1.5h, make mixing oil B;
(3) mixing oil B step (2) being made filters, and under 0.2MPa pressure, through the strainer that has filter bag device, filters, and obtains limpid transparent synthetic hydraulic fluid.
Compared with conventional hydraulic efficiency oil, synthetic hydraulic fluid of the present invention has the following advantages:
A) pour point (experimental technique ASTM D97), the pour point of synthetic hydraulic fluid of the present invention is lower 15~30 ℃ than conventional hydraulic efficiency oil, more adapts to extreme low temperature applied environment;
B) viscosity index (experimental technique ASTM D2270), synthetic hydraulic fluid of the present invention improves 15~30, and viscosity-temperature characteristics can be better, and high-temperature viscosity rate of descent reduces by 15~30%, and high temperature oil film retentivity is better;
C) fastness to wear, adopts micro-tractive force determinator experiment, and synthetic hydraulic fluid fastness to wear of the present invention improves 20% than V class base oil, than IV class base oil, improves 65~85%, is more far superior to mineral oil;
D) deposition is controlled and cleansing performance (experimental technique ASTM D2893B), and synthetic hydraulic fluid of the present invention seldom produces deposition, and acid number variation and viscosity change little, have obvious cleansing performance;
E) hydrolysis stability (experimental technique ASTM D2619), synthetic hydraulic fluid of the present invention is when retaining other IV class and V class synthetic hydraulic fluid performance, improved hydrolysis stability, especially with synthesizing ester hydraulic efficiency oil, compared, hydrolysis stability improves 30~70%;
F) air release property (experimental technique ASTM D3427), the air release value of synthetic hydraulic fluid of the present invention is lower by 70~80% than conventional hydraulic efficiency oil, can greatly reduce the cavitation corrosion of oil product to gear apparatus, slows down oil product aging, extends the work-ing life of oil product;
G) fastness to wear (experimental technique ASTM D6973), synthetic hydraulic fluid of the present invention reduces approximately 86% than the oily wear rate of conventional hydraulic, has significant fastness to wear;
H) supporting capacity (experimental technique DIN51354), the inefficacy rank of synthetic hydraulic fluid of the present invention is than 2~5 grades of the oily improves of conventional hydraulic, and supporting capacity is stronger, under the high sliding velocity of high temperature, can provide better oil film protection to equipment;
I) biological degradability of synthetic hydraulic fluid of the present invention can reach more than 70%, belongs to environmentally friendly product;
J) oxidation stability (experimental technique ASTM D2272), synthetic hydraulic fluid of the present invention improves 70~80% than the synthetic hydraulic fluid of synthetic hydrocarbon, synthetic ester, has effectively extended work-ing life;
K) overlength life cycle, the drain period of synthetic hydraulic fluid of the present invention is 1~5 times of conventional hydraulic oil.