CN113652872B - Emergency lubricating oil core material and preparation method thereof, oil-containing emergency lubricating oil core material and preparation method and application thereof - Google Patents

Emergency lubricating oil core material and preparation method thereof, oil-containing emergency lubricating oil core material and preparation method and application thereof Download PDF

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CN113652872B
CN113652872B CN202111042980.8A CN202111042980A CN113652872B CN 113652872 B CN113652872 B CN 113652872B CN 202111042980 A CN202111042980 A CN 202111042980A CN 113652872 B CN113652872 B CN 113652872B
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core material
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lubricating oil
felt
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CN113652872A (en
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王超
王廷梅
王齐华
宋富智
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Lanzhou Institute of Chemical Physics LICP of CAS
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/02—Natural fibres, other than mineral fibres
    • D06M2101/10—Animal fibres
    • D06M2101/12—Keratin fibres or silk

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • Lubricants (AREA)

Abstract

The invention provides an emergency lubricating core material and a preparation method thereof, an oil-containing emergency lubricating core material and a preparation method and application thereof, and belongs to the technical field of lubricating materials. The emergency lubricating oil core material takes felt as a matrix, polyurethane with a three-dimensional reticular porous structure is loaded, the material is soft and easy to bend, the oil-containing emergency lubricating oil core material obtained after oil absorption can be directly plugged into a gear shaft of a transmission system, a complex oil supply system or device is not required to be equipped, and when the oil supply and lubrication system cannot normally work outside the transmission system, the oil-containing emergency lubricating oil core material can continuously provide lubricating oil for a bearing through the centrifugal force in the process of rotating along with the shaft, so that the dry running time of the bearing is prolonged.

Description

Emergency lubricating oil core material and preparation method thereof, oil-containing emergency lubricating oil core material and preparation method and application thereof
Technical Field
The invention relates to the technical field of lubricating materials, in particular to an emergency lubricating core material and a preparation method thereof, an oil-containing emergency lubricating core material and a preparation method and application thereof.
Background
Once the transmission system loses lubricating oil, the bearing in the speed reducer enters a dry running state in a short time, and then transmission failure occurs. To avoid this, emergency lubrication systems are often provided in the retarder. Patent CN108488601A discloses an emergent lubricating system of transmission system test bed, this system includes emergent pump, automatically controlled governing valve and oil bath, and when normal oil feeding system became invalid, the moving part such as automatically controlled governing valve control oil bath oil-out and bearing communicated with each other, thereby lubricating oil in the oil bath makes the bearing continue work a period under the effect of inertia force flows out. Utility model patent CN206647520U discloses an emergent lubricating arrangement of reduction gear, the device include oil storage portion, seal part and heat transfer part. When the normal oil supply lubrication system of the speed reducer fails, the heat is gathered due to lack of lubrication of moving parts such as bearings and gears, the heat is transferred to the heat transfer part, the heat transfer part is subjected to thermal expansion deformation, the sealing part connected with the heat transfer part moves towards the inside of the oil storage part along with the heat transfer part, the sealing part cannot completely cover the oil outlet, and lubricating oil in the oil storage part flows out along a gap between the sealing part and the oil outlet to lubricate the bearings and other parts.
In summary, the emergency lubrication system related to the prior art needs to be additionally provided with a complex oil supply system or device, which undoubtedly increases the overall design and manufacturing difficulty of the equipment, and further increases the weight of the whole transmission system, and is difficult to meet the requirements of some transmission systems with special requirements on space size.
Disclosure of Invention
The oil-containing emergency lubricating oil core material obtained after the emergency lubricating oil core material is immersed in oil can be directly plugged into a gear shaft of a transmission system, and the emergency requirement of the transmission system can be met without additionally arranging a complex oil supply system or device.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an emergency lubricating oil core material which comprises a felt and polyurethane filled in pores of the felt, wherein the polyurethane has a three-dimensional net-shaped porous structure.
Preferably, the aperture of the emergency lubricating oil core material is 0.5-8 μm, and the porosity is more than 50%.
The invention provides a preparation method of the emergency lubricating oil core material, which comprises the following steps:
mixing polyisocyanate, a polar solvent, a hydroxyl-containing cross-linking agent and a catalyst to obtain a polyurethane precursor solution;
and (2) soaking the felt into the polyurethane precursor solution, then taking out the felt, carrying out a crosslinking reaction to form a three-dimensional network structure in pores of the felt, removing the polar solvent in the three-dimensional network structure, and forming polyurethane with a three-dimensional reticular porous structure in the pores of the felt to obtain the emergency lubricating oil core material.
Preferably, the porosity of the felt is 50-80%, the thickness of the felt is 1-10 mm, and the pore diameter of the felt is 10-50 microns.
Preferably, the polyisocyanate comprises triphenylmethane triisocyanate and/or hexamethylene diisocyanate trimer;
the hydroxyl-containing cross-linking agent is dihydric alcohol or dihydric phenol;
the molar ratio of isocyanate groups in the polyisocyanate to hydroxyl groups in the hydroxyl-containing crosslinking agent is 1: 1;
the total content of the polyisocyanate and the hydroxyl-containing cross-linking agent in the polyurethane precursor solution is 15-30 wt%.
Preferably, the catalyst is a tertiary amine catalyst or an organometallic compound catalyst; the amount of the catalyst substance is 1-2% of the amount of the polyisocyanate substance.
Preferably, the time of the crosslinking reaction is 6-12 h.
The invention provides an oil-containing emergency lubricating core material, which comprises an emergency lubricating core material and lubricating oil stored in the emergency lubricating core material; the emergency lubricating oil core material is the emergency lubricating oil core material or the emergency lubricating oil core material prepared by the preparation method in the scheme.
The invention provides a preparation method of the oil-containing emergency lubricating oil core material, which comprises the following steps:
and (3) immersing the emergency lubricating oil core material into lubricating oil, and performing impregnation under a vacuum condition to obtain the oil-containing emergency lubricating oil core material.
The invention provides an application of the oil-containing emergency lubricating oil core material or the oil-containing emergency lubricating oil core material prepared by the preparation method in the scheme in a transmission system.
The invention provides an emergency lubricating oil core material which comprises a felt and polyurethane filled in pores of the felt, wherein the polyurethane has a three-dimensional net-shaped porous structure.
The oil core material takes felt as a matrix, polyurethane with a three-dimensional reticular porous structure is loaded, the material is soft and easy to bend, the oil-containing emergency lubricating oil core material obtained after oil absorption can be directly plugged into a gear shaft of a transmission system, a complex oil supply system or device is not required to be equipped, and when the oil supply and lubricating system cannot normally work outside the transmission system, the oil-containing emergency lubricating oil core material can continuously provide lubricating oil for a bearing through the centrifugal force in the process of rotating along with the shaft, so that the dry running time of the bearing is prolonged.
Furthermore, the polyurethane has a three-dimensional net-shaped porous structure, a small hole structure with the aperture of 0.5-8 microns can be introduced into the felt, the small hole structure can generate large capillary acting force to adsorb lubricating oil, and the lubricating oil is slowly released under the action of high-rotating-speed centrifugal force, so that the high-rotating-speed emergency lubricating device is suitable for high-rotating-speed emergency lubrication. Meanwhile, the introduction of the small-aperture pore structure does not obviously reduce the high porosity of the felt, and the felt still has the porosity of more than 50 percent and the oil content of more than 120 percent, so the felt has longer oil supply life.
The emergency lubricating oil core material has uniform pore distribution and uniform distribution of the lubricating oil stored in the emergency lubricating oil core material, so that the emergency lubricating oil core material has better dynamic balance in the process of rotating along with a transmission system and cannot influence the normal work of the transmission system.
The oil-containing emergency lubricating core material can be applied to emergency lubrication of a transmission system and can also be popularized to high-speed bearing lubrication in conventional mechanical equipment.
Drawings
FIG. 1 is a scanning electron microscope image of the pore morphology of the wool felt selected in example 1;
FIG. 2 is a pore size distribution curve of the wool felt selected in example 1;
FIG. 3 is a scanning electron micrograph of the voids of an emergency core lube material prepared according to example 1;
FIG. 4 is a plot of the pore size distribution of the emergency core lube material prepared in example 1.
Detailed Description
The invention provides an emergency lubricating oil core material which comprises a felt and polyurethane filled in pores of the felt, wherein the polyurethane has a three-dimensional net-shaped porous structure.
In the present invention, the felt is preferably a wool felt or a chemical fiber felt.
In the invention, the aperture of the emergency lubricating oil core material is preferably 0.5-8 μm, more preferably 1-7 μm, even more preferably 1-5 μm, and most preferably 2-4 μm. In an embodiment of the invention, the emergency core oil material has a pore size of 3.1 μm. In the present invention, the porosity of the emergency lubricating core material is preferably 50% or more, and more preferably 50% to 65%.
The emergency lubricating oil core material takes felt as a matrix, loads polyurethane with a three-dimensional reticular porous structure, is soft and flexible, and can be directly plugged into a gear shaft of a transmission system. In addition, by controlling the aperture of the emergency lubricating oil core material to be 0.5-8 μm, a larger capillary acting force can be generated to adsorb lubricating oil, and the lubricating oil is slowly released under the action of a high-speed centrifugal force, so that the emergency lubrication of the oil core material is applicable to the high-speed range of 5000-30000 rpm. Meanwhile, the introduction of a small-aperture pore structure of 0.5-8 mu m does not obviously reduce the high porosity of the felt, and the porosity is still more than 50%, so that the oil content after oil immersion treatment reaches more than 120%, and the oil supply service life is longer.
The invention provides a preparation method of the emergency lubricating oil core material, which comprises the following steps: mixing polyisocyanate, a polar solvent, a hydroxyl-containing cross-linking agent and a catalyst to obtain a polyurethane precursor solution;
and (2) soaking the felt into the polyurethane precursor solution, then taking out the felt, carrying out a crosslinking reaction to form a three-dimensional network structure in pores of the felt, removing the polar solvent in the three-dimensional network structure, and forming polyurethane with a three-dimensional reticular porous structure in the pores of the felt to obtain the emergency lubricating oil core material.
In the present invention, the starting materials used are all commercially available products well known in the art, unless otherwise specified.
The polyurethane precursor solution is obtained by mixing polyisocyanate, a polar solvent, a hydroxyl-containing crosslinking agent and a catalyst.
In the present invention, the polyisocyanate preferably includes triphenylmethane triisocyanate and/or hexamethylene diisocyanate trimer; when the polyisocyanate is a mixture of triphenylmethane triisocyanate and hexamethylene diisocyanate trimer, the invention has no special requirement on the proportion of the triphenylmethane triisocyanate and the hexamethylene diisocyanate trimer, and the proportion can be any.
In the present invention, the polar solvent is preferably acetone, tetrahydrofuran, ethyl acetate or acetonitrile, more preferably acetone.
In the present invention, the hydroxyl group-containing crosslinking agent is preferably a diol or a dihydric phenol; the glycol preferably comprises polyethylene glycol; the dihydric phenol preferably comprises 4, 4-dihydroxybenzophenone and/or sulfonyldiphenol. When the dihydric phenol is a mixture of 4, 4-dihydroxy benzophenone and sulfonyl diphenol, the proportion of the 4, 4-dihydroxy benzophenone and the sulfonyl diphenol is not specially required, and any proportion can be adopted.
In the present invention, the molar ratio of isocyanate groups in the polyisocyanate to hydroxyl groups in the hydroxyl group-containing crosslinking agent is preferably 1: 1.
in the present invention, the catalyst is preferably a tertiary amine catalyst or an organometallic compound catalyst; the tertiary amine catalyst preferably comprises triethanolamine; the organometallic compound catalyst preferably comprises diisobutyltin dilaurate catalyst. In the invention, the amount of the catalyst is preferably 1 to 2% of the molar amount of the polyisocyanate, more preferably 1.2 to 1.8%, and even more preferably 1.4 to 1.6%.
In the present invention, the amount of the polar solvent is preferably 15 to 30 wt%, more preferably 18 to 26 wt%, and even more preferably 20 to 23 wt% of the total content of the polyisocyanate and the hydroxyl group-containing crosslinking agent in the polyurethane precursor solution.
In the present invention, the mixing of the polyisocyanate, the polar solvent, the hydroxyl group-containing crosslinking agent and the catalyst preferably comprises: mixing polyisocyanate with a polar solvent to obtain a clear solution; and sequentially adding a hydroxyl-containing cross-linking agent and a catalyst into the clarified solution, and uniformly stirring to obtain a polyurethane precursor solution.
After obtaining the polyurethane precursor solution, the felt is soaked in the polyurethane precursor solution, then the felt is taken out for cross-linking reaction, a three-dimensional network structure is formed in the pores of the felt, the polar solvent in the three-dimensional network structure is removed, and polyurethane with a three-dimensional reticular porous structure is formed in the pores of the felt, so that the emergency lubricating oil core material is obtained.
In the invention, the porosity of the felt is preferably 50-80%, more preferably 55-75%, and further preferably 60-70%; the thickness of the felt is preferably 1-10 mm, and more preferably 3-7 mm; the aperture of the felt is preferably 10-50 mu m. In an embodiment of the invention, the pore size of the felt is 24.2 μm. According to the invention, the felt is preferably cut into felt sheets with corresponding sizes according to actual installation requirements, and then is soaked in the polyurethane precursor solution.
The invention has no special requirement on the dosage of the polyurethane precursor solution, and the felt can be completely immersed.
In the invention, the soaking time is preferably 5-10 min. The felt is fully saturated with the polyurethane precursor solution by dipping for 5-10 min.
In the invention, the crosslinking reaction is preferably carried out at room temperature, and the time of the crosslinking reaction is preferably 6-12 h, and more preferably 8-10 h. The crosslinking reaction according to the invention is preferably carried out under standing conditions. Because the crosslinking reaction rate is slow, although a certain degree of crosslinking exists in the dipping process, the crosslinking degree is not large, and the adsorption of the polyurethane precursor solution is not influenced.
In the crosslinking reaction process, the polyisocyanate and the hydroxyl-containing crosslinking agent are subjected to crosslinking reaction under the action of a catalyst, so that polyurethane with a three-dimensional network structure is formed in pores of the felt, and meanwhile, the polar solvent is filled in the three-dimensional network structure.
After the crosslinking reaction is finished, the polar solvent in the three-dimensional network structure is removed, and polyurethane with a three-dimensional net-shaped porous structure is formed in the pores of the felt, so that the emergency lubricating oil core material is obtained.
In the present invention, the method for removing the polar solvent in the three-dimensional network structure preferably comprises: and repeatedly cleaning the felt subjected to the crosslinking reaction by using acetone, and then drying the felt at normal temperature and normal pressure until the quality of the felt is constant to obtain the emergency lubricating oil core material.
The invention provides an oil-containing emergency lubricating core material, which comprises an emergency lubricating core material and lubricating oil stored in the emergency lubricating core material; the emergency lubricating oil core material is the emergency lubricating oil core material or the emergency lubricating oil core material prepared by the preparation method in the scheme. In the present invention, the oil content of the oil-containing emergency lubricating core material is preferably 120% or more. The present invention does not require any particular kind of lubricating oil, and any lubricating oil known in the art may be used. In an embodiment of the invention, the lubricating oil is a PAO4 lubricating oil.
The invention provides a preparation method of the oil-containing emergency lubricating oil core material, which comprises the following steps: and (3) immersing the emergency lubricating oil core material into lubricating oil, and performing impregnation under a vacuum condition to obtain the oil-containing emergency lubricating oil core material.
The emergency lubricating oil core material has no special requirement on the dosage of the lubricating oil, and the emergency lubricating oil core material can be completely immersed. The present invention does not require any particular kind of lubricating oil, and lubricating oils known in the art may be used. In an embodiment of the invention, the lubricating oil is a PAO4 lubricating oil.
The invention has no special requirement on the vacuum degree of the vacuum condition, the higher the vacuum degree is, the shorter the dipping time is, and the technicians in the field can adjust the vacuum degree according to the rule.
The invention provides an application of the oil-containing emergency lubricating oil core material or the oil-containing emergency lubricating oil core material prepared by the preparation method in the scheme in a transmission system.
The oil-containing emergency lubricating oil core material is preferably and directly plugged into a gear shaft of a transmission system without a complex oil supply system or device, and when the oil supply and lubricating system cannot normally work outside the transmission system, the oil-containing emergency lubricating oil core material can continuously provide lubricating oil for the bearing through the centrifugal force in the process of rotating along with the shaft, so that the dry running time of the bearing is prolonged.
In the application process, the rotating speed of the transmission system is preferably more than 5000rpm, and more preferably 5000-30000 rpm.
The emergency lubricating core material and the preparation method thereof, the oil-containing emergency lubricating core material and the preparation method and application thereof provided by the present invention are described in detail below with reference to the examples, but they should not be construed as limiting the scope of the present invention.
Example 1
1) Mixing 25 g of triphenylmethane triisocyanate with 257.3 g of acetone solvent to obtain a clear solution, adding 20.4 g of PEG200 into the clear solution, then adding 0.6 g of diisobutyltin dilaurate catalyst, and uniformly stirring to obtain a polyurethane precursor solution.
2) Selecting wool felt with the porosity of 78%, cutting the wool felt into 20 pieces of phi 46 multiplied by phi 16mm with the thickness of 2mm, wherein the pore size distribution curve and the pore morphology are shown in figures 1-2. And (3) drying the felt, then immersing the felt into the prepared polyurethane precursor solution, taking out the felt after 5 minutes, placing the felt in a room temperature environment, and standing for 8 hours to complete the crosslinking reaction.
3) And repeatedly cleaning the felt after the crosslinking reaction by using acetone, and then drying at normal temperature and normal pressure until the quality of the felt is constant to obtain the emergency lubricating oil core material, wherein the pore diameter distribution curve and the pore morphology are shown in figures 3-4.
4) And (3) soaking the emergency lubricating oil core material in PAO4 lubricating oil, soaking the emergency lubricating oil core material in oil at 80 ℃ under a vacuum condition for 24 hours, and taking out the emergency lubricating oil core material containing oil.
FIG. 1 is a scanning electron microscope image of the pore morphology of the wool felt selected in example 1, and it can be seen that the pore diameter of the wool felt is large and is only suitable for low rotation speed when used as emergency lubrication. Because at lower rotation speed, the lubricating oil stored in the pores is quickly and completely released under the action of centrifugal force.
FIG. 2 is a pore size distribution curve of the wool felt selected in example 1, and it can be seen from FIG. 2 that the pore size of the wool felt is 24.2 μm.
FIG. 3 is a scanning electron micrograph of the pores of the emergency core lube material prepared in example 1. As can be seen from comparison of the figure 1, the original pores of the felt are filled up by the pore structure of the polyurethane three-dimensional network, and the pore diameter is reduced.
FIG. 4 is a plot of the pore size distribution of the emergency core lube material prepared in example 1, and it can be seen that the pore size of the emergency core lube material is 3.1 μm.
Respectively testing the oil content of the oil-containing emergency lubricating oil core material and the oil supply rate under different rotating speeds, wherein the oil content is the ratio of the quality of the immersed lubricating oil to the dry weight of the oil core material before oil immersion, and the oil supply performance test process comprises the following steps: 20 pieces of the oil-containing emergency lubricating oil core material (annular) in example 1 are placed in an oil throwing shaft and are arranged on a high-speed motor to rotate at a high speed, lubricating oil stored in the oil-containing emergency lubricating oil core material ring is released under the action of centrifugal force, and the average oil supply rate in different time periods within 31 minutes at different rotating speeds is respectively tested. The oil content of the prepared oil-containing emergency lubricating oil core material is 142%, and the oil supply rate result within the rotating speed range of 5000-30000 rpm is shown in table 1. As can be seen from Table 1, the oil-containing emergency lubricating core material has a stable oil supply rate under the action of a high-rotation-speed centrifugal force, the optimal applicable rotation speed is 5000-10000 rpm, the oil supply service life is long, the minimum oil supply rate in 31min is not lower than 0.1g/min, and the requirement of the emergency oil supply service life in 31min can be met.
TABLE 1 oil supply Rate results for the oil-containing emergency core materials of example 1 at various speeds
Figure RE-GDA0003311495690000081
Example 2
1) Mixing 25 g of triphenylmethane triisocyanate with 106 g of acetone solvent to obtain a clear solution, adding 20.4 g of PEG200 into the clear solution, then adding 0.4 g of diisobutyltin dilaurate catalyst, and uniformly stirring to obtain a polyurethane precursor solution.
2) The same wool felt as in example 1 was selected, the thickness of which was 2mm, and 20 pieces of felt sheets of phi 46 x phi 16mm were cut. And (3) drying the felt, then immersing the felt into the prepared polyurethane precursor solution, taking out the felt after 10 minutes, placing the felt in a room temperature environment, and standing for 12 hours to complete the crosslinking reaction.
3) And repeatedly cleaning the felt after the crosslinking reaction by using acetone, and then drying the felt at normal temperature and normal pressure until the quality of the felt is constant to obtain the emergency lubricating oil core material.
4) And (3) soaking the emergency lubricating oil core material in PAO4 lubricating oil, soaking the emergency lubricating oil core material in oil at 80 ℃ under a vacuum condition for 24 hours, and taking out the emergency lubricating oil core material containing oil.
Referring to the test method of example 1, the oil content of the oil-containing emergency lubricating core material prepared in example 2 was determined to be 122%, and the results of oil feeding rate in the rotation speed range of 5000 to 30000rpm are shown in table 2. As can be seen from Table 2, the oil-containing emergency lubricating core material of the embodiment 2 has a stable oil supply rate under the action of a high-speed centrifugal force, the best applicable speed is 20000-30000 rpm, and the oil supply service life is long, the minimum oil supply rate is not lower than 0.1g/min within 31min, and the requirement of the emergency oil supply service life within 31min can be met.
TABLE 2 oil supply Rate results for the oil containing emergency core oil of example 2 at various speeds
Figure RE-GDA0003311495690000091
Example 3
1) Mixing 20 g of hexamethylene diisocyanate trimer with 124.4 g of acetone solvent to obtain a clear solution, adding 11.1 g of 4, 4-dihydroxy benzophenone into the clear solution, then adding 0.2 g of diisobutyronium dilaurate catalyst, and uniformly stirring to obtain a polyurethane precursor solution.
2) The same wool felt as in example 1 was selected, the thickness of which was 2mm, and 20 pieces of felt sheets of phi 46 x phi 16mm were cut. And (3) drying the felt, then immersing the felt into the prepared polyurethane precursor solution, taking out the felt after 5 minutes, placing the felt in a room temperature environment, and standing for 8 hours to complete the crosslinking reaction.
3) And repeatedly cleaning the felt after the crosslinking reaction by using acetone, and then drying the felt at normal temperature and normal pressure until the quality of the felt is constant to obtain the emergency lubricating oil core material.
4) And (3) soaking the emergency lubricating oil core material in PAO4 lubricating oil, soaking the emergency lubricating oil core material in oil at 80 ℃ under a vacuum condition for 24 hours, and taking out the emergency lubricating oil core material containing oil.
Referring to the test method of example 1, the oil content of the oil-containing emergency lubricating core material prepared in example 3 was 131%, and the results of oil feeding rate in the rotation speed range of 5000 to 30000rpm were shown in table 3. The oil-containing emergency lubricating core material has stable oil supply rate under the action of high-speed centrifugal force, the optimal applicable rotating speed is 20000-30000 rpm, the oil supply service life is long, the minimum oil supply rate in 31min is not lower than 0.1g/min, and the requirement of the emergency oil supply service life in 31min can be met.
TABLE 3 oiling Rate results for the oil-containing emergency wick material of example 3 at various speeds
Figure RE-GDA0003311495690000092
Figure RE-GDA0003311495690000101
Example 4
1) Mixing 25 g of triphenylmethane triisocyanate with 106 g of acetone solvent to obtain a clear solution, adding 20.4 g of PEG200 into the clear solution, then adding 0.4 g of diisobutyltin dilaurate catalyst, and uniformly stirring to obtain a polyurethane precursor solution.
2) Selecting wool felt with porosity of 54%, the thickness of the wool felt is 2mm, cutting the wool felt into 20 pieces of phi 46 multiplied by phi 16mm, and the pore diameter distribution curve is shown in figure 4. And (3) drying the felt, then immersing the felt into the prepared polyurethane precursor solution, taking out the felt after 5 minutes, placing the felt in a room temperature environment, and standing for 8 hours to complete the crosslinking reaction.
3) And repeatedly cleaning the felt after the crosslinking reaction by using acetone, and then drying the felt at normal temperature and normal pressure until the quality of the felt is constant to obtain the emergency lubricating oil core material.
4) And (3) soaking the emergency lubricating oil core material in PAO4 lubricating oil, soaking the emergency lubricating oil core material in oil at 80 ℃ under a vacuum condition for 24 hours, and taking out the emergency lubricating oil core material containing oil.
Referring to the test method of example 1, the oil content of the oil-containing emergency core material prepared in example 4 was measured to be 92%, and the results of oil supply rate in the rotation speed range of 5000 to 30000rpm are shown in table 4. It can be seen that the oil-containing emergency lubricating core material has a stable oil supply rate under the action of high-speed centrifugal force, the optimal applicable rotating speed is 10000-20000 rpm, the oil supply service life is long, the minimum oil supply rate in 31min is not lower than 0.1g/min, and the requirement of the emergency oil supply service life in 31min can be met.
TABLE 4 oiling Rate results for the oil-containing emergency wick material of example 4 at various speeds
Figure RE-GDA0003311495690000102
Comparative example 1
The same wool felt as in example 1 was selected, the thickness of which was 2mm, and 20 pieces of felt sheets of phi 46 x phi 16mm were cut. And drying the felt, soaking the felt in PAO4 lubricating oil, soaking the felt in oil at 80 ℃ under a vacuum condition for 24 hours, and taking out the felt to obtain the oil-containing emergency lubricating oil core material. The oil content and the oil supply performance of the oil-containing emergency lubricating core material are respectively tested by referring to the method of example 1, the oil content of the oil-containing emergency lubricating core material of comparative example 1 is 285%, and the oil supply rate results at the rotating speed of 500-20000 rpm are shown in table 5. It can be seen that, compared with example 1, although the porosity of the felt is the same, the internal pores are larger because of no modification, and the oil supply life can only be maintained for 1 minute at the rotation speed of 5000rpm or more, that is, the internal oil storage lubricating oil is completely released, and the optimal applicable rotation speed is 1000 to 2000 rpm.
TABLE 5 oiling Rate results for the oil-containing emergency wick material of comparative example 1 at different speeds
Figure RE-GDA0003311495690000111
Comparative example 2
The same wool felt as in example 4 was selected, the thickness of which was 2mm, and 20 pieces of felt sheets of phi 46 x phi 16mm were cut. And drying the felt, soaking the felt in PAO4 lubricating oil, soaking the felt in oil at 80 ℃ under a vacuum condition for 24 hours, and taking out the felt to obtain the oil-containing emergency lubricating oil core material. Referring to the test method of example 1, the oil content and the oil supply performance of the oil-containing emergency core material of comparative example 2 were respectively tested, the oil content of the oil-containing emergency core material of comparative example 2 was 96%, and the results of the oil supply rate at 500-20000 rpm are shown in table 6. It can be seen that, compared with example 4, although the porosity of the felt is the same, the internal pores are larger because of no modification, and the oil supply life can be maintained for only 1 minute at the rotation speed of 5000rpm or more, that is, the internal oil storage lubricating oil is completely released, and the optimal applicable rotation speed is 2000 to 3000 rpm.
TABLE 6 oiling Rate results for the oil-containing emergency wick material of comparative example 2 at different speeds
Figure RE-GDA0003311495690000112
Figure RE-GDA0003311495690000121
According to the embodiment and the comparative example, the small-aperture structure is introduced into the felt, so that a large capillary acting force can be generated to adsorb lubricating oil, the lubricating oil is slowly released under the action of a high-rotating-speed centrifugal force, and the high-speed emergency lubricating device is suitable for high-rotating-speed emergency lubrication. Meanwhile, the introduction of the small-aperture pore structure does not obviously reduce the high porosity of the felt, and the felt still has the porosity of more than 50 percent and the oil content of more than 120 percent, so the felt has longer oil supply life.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. The preparation method of the emergency lubricating oil core material is characterized by comprising the following steps of:
mixing polyisocyanate, a polar solvent, a hydroxyl-containing cross-linking agent and a catalyst to obtain a polyurethane precursor solution;
soaking a felt into the polyurethane precursor solution, then taking out the felt, carrying out a crosslinking reaction, forming a three-dimensional network structure in pores of the felt, removing a polar solvent in the three-dimensional network structure, and forming polyurethane with a three-dimensional reticular porous structure in the pores of the felt to obtain an emergency lubricating oil core material;
the crosslinking reaction is carried out at room temperature, and the time of the crosslinking reaction is 6-12 h.
2. The method according to claim 1, wherein the felt has a porosity of 50 to 80%, a thickness of 1 to 10mm, and a pore diameter of 10 to 50 μm.
3. The production method according to claim 1, wherein the polyisocyanate comprises triphenylmethane triisocyanate and/or hexamethylene diisocyanate trimer;
the hydroxyl-containing cross-linking agent is dihydric alcohol or dihydric phenol;
the molar ratio of isocyanate groups in the polyisocyanate to hydroxyl groups in the hydroxyl-containing crosslinking agent is 1: 1;
the total content of the polyisocyanate and the hydroxyl-containing cross-linking agent in the polyurethane precursor solution is 15-30 wt%.
4. The production method according to claim 1, wherein the catalyst is a tertiary amine-based catalyst or an organometallic compound catalyst; the amount of the catalyst substance is 1-2% of the amount of the polyisocyanate substance.
5. The emergency lubricating oil core material prepared by the preparation method of any one of claims 1 to 4, which comprises felt and polyurethane filled in pores of the felt, wherein the polyurethane has a three-dimensional net-shaped porous structure.
6. The emergency lubricating oil core material of claim 5, wherein the emergency lubricating oil core material has a pore size of 0.5-8 μm and a porosity of 50% or more.
7. An oil-bearing emergency core lube material comprising an emergency core lube material and a lube stored in said emergency core lube material; the emergency core lube material is the emergency core lube material of claim 5 or 6.
8. The method of making an oil-containing emergency core lubricating oil material of claim 7, comprising the steps of:
and (3) immersing the emergency lubricating oil core material into lubricating oil, and performing impregnation under a vacuum condition to obtain the oil-containing emergency lubricating oil core material.
9. Use of the oil-containing emergency lubricating oil core material of claim 7 or the oil-containing emergency lubricating oil core material prepared by the preparation method of claim 8 in a transmission system.
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