CN114576537B - Capillary tube with excellent desorption performance of lubricating oil liquid drops and processing technology thereof - Google Patents

Capillary tube with excellent desorption performance of lubricating oil liquid drops and processing technology thereof Download PDF

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CN114576537B
CN114576537B CN202210049936.8A CN202210049936A CN114576537B CN 114576537 B CN114576537 B CN 114576537B CN 202210049936 A CN202210049936 A CN 202210049936A CN 114576537 B CN114576537 B CN 114576537B
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capillary tube
polymer coating
lubricating oil
coating
capillary
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CN114576537A (en
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豆照良
宋安佳
刘峰斌
程超
阎红娟
司丽娜
杨晔
李鸿
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North China University of Technology
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    • 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
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/12—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with feed by capillary action, e.g. by wicks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • 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
    • F16N—LUBRICATING
    • F16N2210/00—Applications
    • F16N2210/14—Bearings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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Abstract

The invention discloses a capillary tube with excellent desorption performance of lubricating oil liquid drops and a processing technology thereof, wherein the capillary tube with excellent desorption performance of the lubricating oil liquid drops is provided with an inner conical surface at the outlet end of the capillary tube, and the included angle between the inner conical surface and the end surface is 15-60 degrees; the inner wall, the outer wall and the inner conical surface of the outlet end of the capillary tube are all coated with an oleophobic polymer coating. The inner conical surface opening is used for stabilizing the main flow field at the outlet end, and inducing stable growth and smooth desorption of liquid drops. The oleophobic polymer coating is used for preventing the lubricant from upwards climbing and overgrowing along the outer wall of the capillary tube, and promoting the micro-droplets to be desorbed under the smaller particle size.

Description

Capillary tube with excellent desorption performance of lubricating oil liquid drops and processing technology thereof
Technical Field
The invention relates to the technical field of mechanical engineering surface treatment, in particular to a capillary tube with excellent desorption performance of lubricating oil liquid drops and a processing technology thereof.
Background
The satellite platform with long service life and high reliability is an increasing space strategic requirement in China. Momentum flywheel is an important component of the spatial actuator. At present, the bearing assembly is limited by the technical bottleneck of lubrication of the bearing assembly under the space condition, and after the lubrication state of the bearing assembly in long-term service is deteriorated, the problems of reduced friction performance, unstable friction moment and the like often occur, so that a certain gap still exists between the design life distance of the momentum flywheel and the long-life requirement of the satellite. The problem of lubrication of momentum flywheel has become a key factor restricting the technological improvement of satellite platform.
The space precision bearing assembly is used as a core component of the momentum flywheel, and a long-life lubrication technology is one of important research contents to be developed in the field of space tribology. The research of active micro oil supply technology is developed, continuous micro supply of lubricating oil is realized, a bearing assembly is timely and effectively lubricated, the tribological performance of the bearing assembly in the service period is improved, the application requirements of high precision and long service life of products are met, and the bearing assembly has important value for space technology development in China.
One of the key links of the trace oil supply is to realize the smooth desorption of trace lubricating oil drops at the outlet end of an oil supply capillary. The short growth period and the small desorption particle size of the lubricating oil droplets at the outlet end of the oil supply micro-channel are important for realizing long-term micro-lubrication and long-service-life operation of the bearing.
At present, the growth period of the lubricating oil liquid drop at the outlet end of the lubricating oil liquid drop is longer and the desorption particle size is larger due to the surface characteristics and the geometric characteristics of the oil supply capillary tube. Resulting in increased wear of the bearing assembly waiting for the lubricated surface to be starved for oil for a significant period of time before the lubricant droplets are desorbed. And after the lubricating oil liquid drops with larger particle size are desorbed, the lubricating oil liquid drops cannot be timely spread and soaked, so that the lubricating oil liquid is excessive, and the fluid lubrication effect is difficult to realize. After the lubrication state of the bearing assembly in long-term service is deteriorated, the problems of reduced friction performance, unstable friction moment and the like often occur, and the long-service life operation of on-orbit products is seriously influenced.
Disclosure of Invention
The invention aims to provide a capillary tube with excellent desorption performance of lubricating oil liquid drops, which is used for solving the problems of long growth period, large desorption particle size and poor desorption performance of the conventional lubricating oil liquid drops at the outlet end of a trace oil supply capillary tube.
Another object of the present invention is to provide a process for manufacturing a capillary tube excellent in desorption performance of lubricant droplets.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the capillary tube with excellent desorption performance of lubricating oil liquid drops is provided with an inner conical surface at the outlet end, and the included angle between the inner conical surface and the end surface is 15-60 degrees; the inner wall, the outer wall and the inner conical surface of the outlet end of the capillary tube are all coated with an oleophobic polymer coating.
Further, the dry film thickness of the oleophobic polymer coating is 15-50 μm. The oleophobic polymer coating is coated on the surface of the capillary substrate in a dip-coating mode, so that the dry film thickness of the coating and the viscosity of the oleophobic polymer coating are closely related: the content of the organic solvent is increased, the viscosity of the paint is reduced, and the thickness of the coating film is reduced; the consumption of the organic solvent is reduced, the viscosity of the paint is improved, and the thickness of the coating film is increased. The wet film thickness after dip coating is usually 20 to 80. Mu.m, and the film thickness is reduced after solvent evaporation, curing and molding.
Further, the oleophobic polymer coating is composed of polydimethylsiloxane, polyhexamethylene diisocyanate, fluorocarbon resin, benzoyl peroxide, nano-silica and xylene. Fluorocarbon resins are the primary film forming materials for the preparation of oleophobic polymer coatings. Polydimethylsiloxane is a low surface energy aid for increasing the surface tension gradient during film formation of a coating and further reducing the surface energy of the coating. The polyhexamethylene diisocyanate is used as a crosslinking curing agent for crosslinking and curing the coating to form a film; benzoyl peroxide is used as an initiator and catalyst required for the crosslinking and curing of the resin. The nano silicon dioxide is an inorganic filler and is used for adjusting the rheological property of the coating in the curing film forming process, and a micro-nano structure is formed after the coating is cured into a film and is used for improving the oleophobic property of the polymer coating and improving the oil contact angle. Xylene is an organic solvent used to dilute, disperse the components in the coating and adjust the viscosity of the coating.
Further, the oleophobic polymer coating comprises the following components in parts by mass:
Figure BDA0003474090460000021
Figure BDA0003474090460000031
the processing technology of the capillary tube with excellent desorption performance of the lubricating oil liquid drops comprises the following steps:
s1, processing an outlet end of a capillary into an inner conical surface, wherein the angle between the inner conical surface and an outlet plane of the outlet end is 15-60 degrees;
s2: preparing an oleophobic polymer coating;
s3: and (2) coating the oleophobic polymer coating in the step (S2) on the inner wall surface and the outer wall surface of the capillary, and curing the capillary for 2 hours at 100 ℃ after the solvent contained in the oleophobic polymer coating volatilizes, so that the oleophobic polymer coating is cured into the oleophobic polymer coating.
Further, the oleophobic polymer coating in the step S2 comprises the following substances in percentage by mass:
Figure BDA0003474090460000032
further, the preparation method of the oleophobic polymer coating in the step S2 comprises the following steps: taking the formula amount of polydimethylsiloxane and polyhexamethylene diisocyanate, and uniformly stirring to obtain a silicone rubber coating; then taking the fluorocarbon resin and benzoyl peroxide with the formula amount, and uniformly stirring to obtain the fluorocarbon resin coating; and finally, uniformly stirring the silicone rubber coating, the fluorocarbon resin coating, the nano silicon dioxide and the dimethylbenzene according to the formula amount.
Further, the stirring is performed by adopting a planetary stirrer.
Further, when the oleophobic polymer coating is coated on the inner wall surface and the outer wall surface of the capillary tube, the coating is performed in a dip-coating manner.
The capillary tube with excellent desorption performance of the lubricating oil liquid drops has the following advantages:
fig. 2 is a micrograph of the growth and desorption process of a lubricant droplet at the outlet end of a conventional capillary tube. It can be seen that in the gravity environment, the growth and desorption process of the lubricating oil at the outlet end of the conventional oil supply capillary tube can be divided into 5 stages of expansion, climbing, sliding down, necking and desorption. In the initial stage, lubricating oil is slowly injected under the drive of pressure and expands at the tail end of a capillary tube to form a hemispherical convex droplet embryonic form, the diameter of the hemispherical droplet is gradually increased along with continuous injection of the lubricating oil, and when the diameter is increased to the outer wall of the capillary tube, the lubricating oil starts to climb upwards along the outer wall of the capillary tube under the action of capillary force. As the height of the lubricant liquid increases, the volume of the liquid drop increases gradually, the gravity increases gradually, and the lubricant liquid gradually exceeds the limit value of the capillary force and slides down to the outlet end face along the outer wall face. With the continuous injection of lubricating oil, the volume and weight of the liquid drops further increase, the gravity effect starts to be prominent, and the phenomenon of necking of the liquid drops occurs. As the volume and weight of the droplet continue to increase, the gravity force to which the droplet is subjected is progressively greater than the viscous force and surface tension, and the necked line becomes longer and thinner until breakage occurs, and is detached from the outlet end of the capillary. As the lubricating oil is continuously injected, the residual liquid at the end of the capillary tube is retracted into a hemispherical shape and then enters the next cycle. From the different stages of expansion, climbing, sliding down, necking and desorption, the growth and desorption process of the lubricating oil at the outlet end of the capillary tube are the combined effect of wall capillary force, oil viscosity force, surface tension, gravity and the like.
The growth and desorption process of the lubricating oil droplets at the outlet end of the conventional oil supply capillary can be seen, the existence of the capillary force on the wall surface is a main factor for generating wall surface climbing and affecting the desorption of the micro droplets, and the action principle is shown in fig. 3.
According to the invention, the capillary is subjected to surface modification so as to influence the capillary force on the wall surface, so that the original stress state is broken, and finally, the purpose of optimizing the growth and desorption performance of the lubricating oil at the outlet end of the capillary is achieved. Fig. 4 is a micrograph of the growth and desorption process of lubricating oil droplets at the outlet end of a capillary tube according to the present invention. It can be seen that after the internal conical surface design and the surface oleophobic modification treatment, the growth and desorption processes of the lubricating oil liquid drop are obviously changed, the two stages of climbing and sliding disappear, the whole growth and desorption processes are evolved into three stages of expansion, necking and desorption, and the growth period and the desorption particle size of the liquid drop at the outlet end of the capillary tube are obviously reduced.
In a comprehensive way, an inner conical surface is processed at the outlet end of the capillary, and an opening of the inner conical surface is used for stabilizing the main flow field at the outlet end and inducing stable growth and forward Li Tuofu of liquid drops; and the surface of the capillary tube is subjected to oleophobic modification treatment, and the oleophobic polymer is used for preventing oil from climbing upwards and overgrowing along the outer wall of the capillary tube, so that the micro-droplets are promoted to be desorbed under the smaller particle size. Under the combined action of the inner conical surface and the oleophobic polymer coating, the capillary effect of the outer wall of the capillary facing the lubricating oil is weakened, the wall climbing action is gradually weakened and finally disappears, the lubricating oil drops stably grow under the guidance of the inner conical surface, and smooth desorption is realized under the smaller particle size, as shown in fig. 4.
Drawings
FIG. 1 is a schematic diagram showing the capillary structure with excellent desorption properties of lubricant droplets in example 1;
FIG. 2 is a micrograph of the growth and desorption process of a lubricant droplet at the outlet end of the capillary of comparative example 1;
FIG. 3 is a schematic illustration of the climbing behavior of a lubricant droplet at the outlet end of the capillary of comparative example 1;
FIG. 4 is a micrograph of the growth and desorption process of lubricating oil drop at the outlet end of the capillary tube of example 1;
FIG. 5 is a scanning electron micrograph of an oleophobic polymer coating of the capillary of example 1;
FIG. 6 (a) is a micrograph of the static contact angle of a lubricant droplet on the capillary surface of comparative example 1;
fig. 6 (b) is a microscopic image of the static contact angle of a lubricant droplet on the capillary surface of example 1.
Detailed Description
The technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments, but it should be understood by those skilled in the art that the embodiments described below are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments of the present invention, are within the scope of the present invention.
The experimental methods used in the following examples are conventional methods unless otherwise specified. Materials, reagents and the like used in the examples described below are commercially available unless otherwise specified.
Example 1
The capillary tube with excellent desorption performance of the lubricating oil liquid drops in the embodiment is provided with an inner conical surface at the outlet end, and the included angle between the inner conical surface and the end face of the outlet end is 15 degrees. The inner wall, the outer wall and the inner conical surface of the outlet end of the capillary tube are all coated with an oleophobic polymer coating. The oleophobic polymer coating had a thickness of 15 μm. The oleophobic polymer coating comprises the following components in parts by mass:
Figure BDA0003474090460000061
the processing technology of the capillary tube with excellent desorption performance of the lubricating oil liquid drops in the embodiment comprises the following steps:
s1: a 304 stainless steel metal capillary with the geometric dimension phi of 1.2 multiplied by 0.1 is selected, an inner conical surface is processed at the outlet end of the capillary by adopting a precise milling processing mode, and the angle between the inner conical surface and the end face of the outlet end is alpha=15°.
S2: weighing the following raw materials in percentage by mass:
Figure BDA0003474090460000062
firstly weighing polydimethylsiloxane and polyhexamethylene diisocyanate according to the proportion, putting the polydimethylsiloxane and the polyhexamethylene diisocyanate into a measuring cup, putting the measuring cup into a planetary stirrer, and stirring for 2 minutes to obtain the silicone rubber coating. Then the fluorocarbon resin and benzoyl peroxide are weighed and put into a measuring cup, and stirred for 2 minutes by using a planetary stirrer, so as to obtain the fluorocarbon resin coating. And finally, placing the silicone rubber coating, the fluorocarbon resin coating, the nano silicon dioxide and the dimethylbenzene into a measuring cup, and stirring for 2 minutes by using a planetary stirrer to prepare the oleophobic polymer coating.
S3: and (3) under the condition of room temperature, coating the oleophobic polymer coating in the step (S2) on the inner wall surface and the outer wall surface of the capillary tube in a dip-coating mode, standing at a ventilation position, waiting for the volatilization of the surface solvent, and then placing the capillary tube in a constant temperature box at 100 ℃ for curing for 2 hours, wherein the oleophobic polymer coating is finally prepared on the surface of the capillary tube, and the dry film thickness of the oleophobic polymer coating is 15 mu m.
Example 2
The capillary tube with excellent desorption performance of the lubricating oil liquid drops in the embodiment is provided with an inner conical surface at the outlet end, and the included angle between the inner conical surface and the end face of the outlet end is 60 degrees. The inner wall, the outer wall and the inner conical surface of the outlet end of the capillary tube are all coated with an oleophobic polymer coating. The oleophobic polymer coating had a thickness of 50 μm. The oleophobic polymer coating comprises the following components in parts by mass:
Figure BDA0003474090460000071
the processing technology of the capillary tube with excellent desorption performance of the lubricating oil liquid drops in the embodiment comprises the following steps:
s1: a 316 stainless steel metal capillary with the geometric dimension phi of 1.0 multiplied by 0.1 is selected, an inner conical surface is processed at the outlet end of the capillary in a precise milling mode, and the angle between the inner conical surface and the end face of the outlet end is alpha=60 degrees.
S2: weighing the following raw materials in percentage by mass:
Figure BDA0003474090460000072
firstly weighing polydimethylsiloxane and polyhexamethylene diisocyanate according to the proportion, putting the polydimethylsiloxane and the polyhexamethylene diisocyanate into a measuring cup, putting the measuring cup into a planetary stirrer, and stirring for 2 minutes to obtain the silicone rubber coating. Then the fluorocarbon resin and benzoyl peroxide are weighed and put into a measuring cup, and stirred for 2 minutes by using a planetary stirrer, so as to obtain the fluorocarbon resin coating. And finally, placing the silicone rubber coating, the fluorocarbon resin coating, the nano silicon dioxide and the dimethylbenzene into a measuring cup, and stirring for 2 minutes by using a planetary stirrer to prepare the oleophobic polymer coating.
S3: and (2) coating the oleophobic polymer coating in the step (S2) on the inner wall surface and the outer wall surface of the capillary tube in a dip-coating mode at room temperature, standing at a ventilation position, waiting for the volatilization of the surface solvent, placing the capillary tube in a constant temperature oven at 100 ℃ for curing for 2 hours, and finally preparing the oleophobic polymer coating on the surface of the capillary tube, wherein the dry film thickness of the oleophobic polymer coating is 50 mu m.
Example 3
The capillary tube with excellent desorption performance of the lubricating oil liquid drops in the embodiment is provided with an inner conical surface at the outlet end, and the included angle between the inner conical surface and the end face of the outlet end is 45 degrees. The inner wall, the outer wall and the inner conical surface of the outlet end of the capillary tube are all coated with an oleophobic polymer coating. The oleophobic polymer coating had a thickness of 33 μm. The oleophobic polymer coating comprises the following components in parts by mass:
Figure BDA0003474090460000081
the processing technology of the capillary tube with excellent desorption performance of the lubricating oil liquid drops in the embodiment comprises the following steps:
s1: a 304 stainless steel metal capillary with the geometric dimension phi of 1.2 multiplied by 0.1 is selected, an inner conical surface is processed at the outlet end of the capillary by adopting a precise milling processing mode, and the angle between the inner conical surface and the end face of the outlet end is alpha=45°.
S2: weighing the following raw materials in percentage by mass:
Figure BDA0003474090460000082
Figure BDA0003474090460000091
firstly weighing polydimethylsiloxane and polyhexamethylene diisocyanate according to the proportion, putting the polydimethylsiloxane and the polyhexamethylene diisocyanate into a measuring cup, putting the measuring cup into a planetary stirrer, and stirring for 2 minutes to obtain the silicone rubber coating. Then the fluorocarbon resin and benzoyl peroxide are weighed and put into a measuring cup, and stirred for 2 minutes by using a planetary stirrer, so as to obtain the fluorocarbon resin coating. And finally, placing the silicone rubber coating, the fluorocarbon resin coating, the nano silicon dioxide and the dimethylbenzene into a measuring cup, and stirring for 2 minutes by using a planetary stirrer to prepare the oleophobic polymer coating.
S3: and (3) under the condition of room temperature, coating the oleophobic polymer coating in the step (S2) on the inner wall surface and the outer wall surface of the capillary tube in a dip-coating mode, standing at a ventilation position, waiting for the volatilization of the surface solvent, placing the capillary tube in a constant temperature oven at 100 ℃ for curing for 2 hours, and finally preparing the oleophobic polymer coating on the surface of the capillary tube, wherein the dry film thickness of the oleophobic polymer coating is measured to be 33 mu m.
Comparative example 1
The comparative example was a 304 stainless steel metal capillary having a geometry of Φ1.2x0.1, with the outlet end not angled and not coated with an oleophobic polymer coating.
Test example 1
Surface characterization of capillaries: the surface characterization and analysis of the oleophobic polymer coating of the capillary surface in example 1 was performed under a scanning electron microscope and the results are shown in fig. 5.
Test example 2
Contact angle measurement: the surface contact angle of PAO-10 type aerospace-grade lubricating oil is compared with the surface of a capillary material before and after modification by adopting a surface contact angle measuring instrument, and the result is shown in figure 6.
As can be seen in FIG. 6, the capillary tube of comparative example 1 was not coated with an oleophobic polymer coating, and the static contact angle of the PAO-10 aerospace grade lubricating oil on its surface was 23. The capillary tube of example 1, after oleophobic modification, had a static contact angle of the PAO-10 type aerospace grade lubricant on its surface increased to 94 °. The capillary tube of example 2, after oleophobic modification, had a static contact angle of the PAO-10 type aerospace grade lubricant on its surface increased to 116 °. The oleophobic treatment significantly improves the oleophobic properties of the capillary surface.
Test example 3
And (3) comparing and verifying desorption performance: and (3) continuously and quantitatively pumping PAO-10 type aerospace-grade lubricating oil along the capillary tube at a flow speed of 4mm/s by adopting a micro-feed pump, and shooting the growth and desorption behaviors of lubricating oil drops at the outlet end of the capillary tube by adopting a high-speed camera.
As shown in FIG. 2, the capillary tube of comparative example 1 was not processed with an inner tapered surface at the outlet end, was not subjected to surface oleophobic treatment, had a growth cycle of about 23.7s for the lubricant droplet, and had a particle diameter of 2.56mm at the time of droplet desorption. In addition, the liquid drop has obvious upward climbing process in the growth process, and lubricating oil remains on the outer wall surface of the capillary after the liquid drop is necked and desorbed.
As shown in fig. 4, the capillary tube of example 1 has an outlet end with an alpha=15° inner conical surface, which is subjected to surface oleophobic treatment, and has a contact angle of 94 °, the growth period of the lubricating oil droplet is about 15.2s, and the growth period is shortened by 36.7%; the particle size is reduced to 2.21mm when the liquid drops are desorbed, and the desorption particle size is reduced by 13.7%; and the liquid drop does not climb upwards along the outer wall of the capillary tube in the growth process. This demonstrates that the capillary tube of the present invention has good desorption properties of the lubricant droplets.
Test example 4
And (3) comparing and verifying desorption performance: and (3) continuously and quantitatively pumping PAO-8 type aerospace-grade lubricating oil along the capillary at a flow rate of 3mm/s by adopting a micro-feed pump, and shooting the growth and desorption behaviors of lubricating oil drops at the outlet end of the capillary by adopting a high-speed camera.
The capillary tube of comparative example 1 has an outlet end with an unprocessed inner conical surface, is not subjected to surface oleophobic treatment, has a growth period of lubricating oil liquid drops of about 27.3s, has a particle size of 1.98mm when the liquid drops are desorbed, has an obvious upward climbing process in the growth process, and has lubricating oil liquid remained on the outer wall surface of the capillary tube after the liquid drops are necked and desorbed.
The capillary of example 2 had a growth cycle of about 12.7 seconds for the lubricant droplet, which was reduced by 53.5%; the particle size is reduced to 1.53mm when the liquid drops are desorbed, and the desorption particle size is reduced by 22.7%. The liquid drop does not climb upwards along the outer wall of the capillary tube in the growth process, and the micro liquid drop is guided to gradually grow and expand along the inner conical surface and is smoothly desorbed under the smaller particle size. The capillary tube in the invention has excellent desorption performance of the lubricating oil liquid drops.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.

Claims (6)

1. The capillary tube with excellent desorption performance of lubricating oil liquid drops is characterized in that an inner conical surface is arranged at the outlet end of the capillary tube, and the included angle between the inner conical surface and the end surface is 15-60 degrees; the inner wall, the outer wall and the inner conical surface of the outlet end of the capillary tube are coated with oleophobic polymer coating,
wherein the oleophobic polymer coating comprises polydimethylsiloxane, polyhexamethylene diisocyanate, fluorocarbon resin, benzoyl peroxide, nano silicon dioxide, and
the oleophobic polymer coating comprises the following components in parts by mass:
10 to 20 parts of polydimethylsiloxane
5 to 10 parts of polyhexamethylene diisocyanate
Fluorocarbon resin 30-45 parts
10 to 15 parts of benzoyl peroxide
10-25 parts of nano silicon dioxide.
2. The capillary excellent in desorption properties for lubricating oil droplets according to claim 1, wherein the dry film thickness of the oleophobic polymer coating is 15 to 50 μm.
3. The process for manufacturing a capillary tube excellent in desorption performance of a lubricant droplet as claimed in claim 1, comprising the steps of:
s1, processing an outlet end of a capillary into an inner conical surface, wherein the angle between the inner conical surface and an outlet plane of the outlet end is 15-60 degrees;
s2: preparing an oleophobic polymer coating;
s3: coating the oleophobic polymer coating in the step S2 on the inner wall surface and the outer wall surface of the capillary, solidifying the capillary at 100 ℃ for 2h after the solvent contained in the oleophobic polymer coating volatilizes, so that the oleophobic polymer coating is solidified into an oleophobic polymer coating,
the oleophobic polymer coating in the step S2 comprises the following substances in percentage by mass:
10 to 20 percent of polydimethylsiloxane
5 to 10 percent of polyhexamethylene diisocyanate
Fluorocarbon resin 30-45%
10 to 15 percent of benzoyl peroxide
10 to 25 percent of nano silicon dioxide
The balance is supplemented by the dimethylbenzene.
4. The process for manufacturing a capillary tube excellent in desorption performance of a lubricant droplet according to claim 3, wherein the preparation method of the oleophobic polymer coating in step S2 is as follows: taking the formula amount of polydimethylsiloxane and polyhexamethylene diisocyanate, and uniformly stirring to obtain a silicone rubber coating; then taking the fluorocarbon resin and benzoyl peroxide with the formula amount, and uniformly stirring to obtain the fluorocarbon resin coating; and finally, uniformly stirring the silicone rubber coating, the fluorocarbon resin coating, the nano silicon dioxide and the dimethylbenzene according to the formula amount.
5. The process for manufacturing a capillary tube excellent in desorption performance of lubricating oil droplets according to claim 4, wherein the stirring is performed by a planetary stirrer for 2 minutes.
6. The process for manufacturing a capillary tube excellent in desorption performance for lubricating oil droplets according to claim 3, wherein the oleophobic polymer coating is coated on the inner wall surface and the outer wall surface of the capillary tube by dip coating.
CN202210049936.8A 2022-01-17 2022-01-17 Capillary tube with excellent desorption performance of lubricating oil liquid drops and processing technology thereof Active CN114576537B (en)

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