CN117586549A - Gradient pore porous oil storage medium with surface specific texture and preparation method thereof - Google Patents
Gradient pore porous oil storage medium with surface specific texture and preparation method thereof Download PDFInfo
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- 239000011148 porous material Substances 0.000 title claims abstract description 88
- 238000003860 storage Methods 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003921 oil Substances 0.000 claims abstract description 56
- CHHHXKFHOYLYRE-UHFFFAOYSA-M 2,4-Hexadienoic acid, potassium salt (1:1), (2E,4E)- Chemical compound [K+].CC=CC=CC([O-])=O CHHHXKFHOYLYRE-UHFFFAOYSA-M 0.000 claims abstract description 37
- 229940069338 potassium sorbate Drugs 0.000 claims abstract description 37
- 235000010241 potassium sorbate Nutrition 0.000 claims abstract description 37
- 239000004302 potassium sorbate Substances 0.000 claims abstract description 37
- 238000003825 pressing Methods 0.000 claims abstract description 37
- 238000005245 sintering Methods 0.000 claims abstract description 35
- 238000000465 moulding Methods 0.000 claims abstract description 23
- 239000010687 lubricating oil Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 15
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 14
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 14
- 238000011049 filling Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 53
- 238000001035 drying Methods 0.000 claims description 34
- 238000007723 die pressing method Methods 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 238000011068 loading method Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000005461 lubrication Methods 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/26—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/04—Foams characterised by the foaming process characterised by the elimination of a liquid or solid component, e.g. precipitation, leaching out, evaporation
- C08J2201/042—Elimination of an organic solid phase
- C08J2201/0424—Elimination of an organic solid phase containing halogen, nitrogen, sulphur or phosphorus atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of 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; Derivatives of such polymers
- C08J2327/02—Characterised by the use of 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; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of 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; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of 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; Derivatives of such polymers
- C08J2427/02—Characterised by the use of 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; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/12—Characterised by the use of 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; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2427/18—Homopolymers or copolymers of tetrafluoroethylene
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Abstract
The invention discloses a gradient pore porous oil storage medium with a surface specific texture and a preparation method thereof. And mixing polytetrafluoroethylene and potassium sorbate according to different proportions to respectively obtain a small-aperture porous medium mixed material and a large-aperture porous medium mixed material, respectively molding to obtain a small-aperture porous medium molded compact and a large-aperture porous medium molded compact, sintering the small-aperture porous medium molded compact to obtain a small-aperture porous medium, arranging the large-aperture porous medium molded compact on the upper surface, filling the small-aperture porous medium mixed material in a peripheral gap, performing secondary mold pressing, sintering the molded compact after the secondary mold pressing, placing the molded compact in lubricating oil, and carrying out vacuum oil storage for 22-26 hours to obtain the gradient-aperture porous oil storage medium with the surface specific texture. The invention constructs specific shape and microstructure arrangement on the surface of the porous oil storage medium, so that gradient pores are formed on the surface and inside of the porous oil storage medium, and gradient oil storage and stable oil supply of the porous oil storage medium are realized.
Description
Technical Field
The invention relates to the field of self-lubrication of rolling functional components such as rolling linear guide rails, ball screws and the like, in particular to a gradient pore porous oil storage medium with surface specific textures and a preparation method thereof.
Background
The self-lubricating rolling linear guide rail has important application in the fields of high-end equipment manufacturing and aviation. The porous oil storage medium is a self-lubricating core unit of the rolling linear guide rail, a certain amount of lubricating oil is reserved through pores in the porous medium, and the lubricating oil seeps out of the surface of a friction pair of the rolling linear guide rail, so that the self-lubrication and maintenance-free of the rolling linear guide rail are realized. The internal pores of the porous medium are important carriers for oil storage and oil supply lubrication, and the lubrication performance of the porous oil storage medium is directly affected.
The pore structure and the pore diameter are important indexes for representing the internal pore characteristics of the porous medium, most of the porous medium adopted by the current self-lubricating rolling linear guide rail is of a single pore structure, and the porous medium of the single pore structure is difficult to have higher oil storage capacity and better lubricating oil seepage effect. If the internal pores are too small, the pore storage volume is small, the stored lubricating oil quantity is small, the capillary adsorption force of the pores on the lubricating oil is large, and the lubricating oil seepage effect is poor; if the internal pores are too large, the pore volume is large, and more lubricating oil can be stored, but the too large pores reduce the adsorption effect on the lubricating oil, increase the seepage rate of the lubricating oil, reduce the service time of the stored lubricating oil to a certain extent, and shorten the lubrication life of the porous oil storage medium.
Disclosure of Invention
The invention aims to provide a gradient pore porous oil storage medium with surface specific texture and a preparation method thereof. The surface of the porous oil storage medium is constructed with specific shape and microstructure arrangement, so that gradient pores are formed on the surface and inside of the porous oil storage medium, and gradient oil storage and stable oil supply of the porous oil storage medium are realized.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the preparation method of the gradient pore porous oil storage medium with the surface specific texture comprises the following steps:
1) Mixing polytetrafluoroethylene and potassium sorbate in proportion, wherein the mass fraction of the potassium sorbate accounts for 5% -40% of the total mass of the mixture, and fully stirring and uniformly mixing in a mixer to obtain the small-aperture porous medium mixture;
2) Mixing polytetrafluoroethylene and potassium sorbate in proportion, wherein the mass fraction of the potassium sorbate accounts for 65% -95% of the total mass of the mixture, and fully stirring and uniformly mixing in a mixer to obtain the large-aperture porous medium mixture;
3) Crushing the small-aperture porous medium mixed material and the large-aperture porous medium mixed material by using a crusher respectively, and then drying;
4) Loading the crushed and dried small-aperture porous medium mixture into a die cavity of a die, performing die pressing on a top pressing plate of the die by using a universal testing machine, removing the top pressing plate to prepare a small-aperture porous medium die pressed compact, and placing the small-aperture porous medium die pressed compact and the die into a drying box for drying;
5) Loading the crushed and dried large-aperture porous medium mixture into a die cavity of a die, performing die pressing on a top pressing plate of the die by using a universal testing machine, removing the top pressing plate to prepare a large-aperture porous medium die pressed blank, and placing the large-aperture porous medium die pressed blank and the die into a drying box for drying;
6) Placing the small-aperture porous medium die compact and a die into a vacuum sintering furnace for sintering, volatilizing and disappearing potassium sorbate in the vacuum sintering process of the small-aperture porous medium die compact, forming pores in the small-aperture porous medium die compact to form a small-aperture porous medium, cooling along with the furnace, and taking out the small-aperture porous medium and the die;
7) Arranging large-aperture porous medium die pressed blanks according to a certain distribution (matrix or ring) on the upper surface of a small-aperture porous medium according to the lubrication requirement of an actual part, filling small-aperture porous medium mixed materials in gaps at the periphery of the arranged porous medium die pressed blanks after the arrangement is finished, performing secondary die pressing on a top pressing plate of a die by using a universal tester, and removing the top pressing plate;
8) The molded blank after secondary molding is placed in a vacuum sintering furnace for sintering, then is cooled along with the furnace, potassium sorbate volatilizes and disappears in the vacuum sintering process of the molded blank, through holes are formed in the molded blank, and the holes of the small-aperture porous medium for primary molding, the holes of the large-aperture porous medium in the secondary molded blank and the holes of the small-aperture porous medium are mutually communicated to form the porous medium with specific surface texture characteristics;
9) Placing the porous medium with specific surface texture in lubricating oil, and placing under vacuum degree of 10 -3 In the Pa vacuum atmosphere, the vacuum oil is stored for 22-26 hours, and air in the pores inside the porous medium is emptied, so that lubricating oil can be fully filled into the large-pore-diameter pores and the small-pore-diameter pores inside the porous medium, and the gradient pore-pore porous oil storage medium with the surface specific texture can be prepared.
Further, in the step 1), the mass fraction of the potassium sorbate accounts for 20% of the total mass of the mixed material, and the stirring time is 0.5-1 hour.
Further, in the step 2), the mass fraction of the potassium sorbate accounts for 80% of the total mass of the mixed materials, and the stirring time is 0.5-1 hour.
In the step 3), the small-aperture porous medium mixed material and the large-aperture porous medium mixed material are respectively crushed into powder with the particle size of less than 10 microns, the drying temperature is 115-125 ℃, and the drying time is 2-2.2 hours.
In the step 4), the normal-temperature die pressing is carried out under the condition that the die pressing value ranges from 1MPa to 50MPa, preferably 9.5MPa, the pressure maintaining time ranges from 5 minutes to 30 minutes, preferably 20 minutes, the drying temperature ranges from 55 ℃ to 65 ℃, and the drying time ranges from 48 hours to 55 hours.
In the step 5), the normal-temperature die pressing is carried out under the condition that the die pressing value ranges from 1MPa to 50MPa, preferably 3.125MPa, the pressure maintaining time ranges from 5min to 30min, preferably 15min, the drying temperature ranges from 55 ℃ to 65 ℃, and the drying time ranges from 48 hours to 55 hours.
In step 6), the degree of vacuum<10 -3 Pa, sintering temperature is 355-395 ℃, preferably 390 ℃, and heat preservation is carried out for 2-2.2 hours.
In the step 7), the normal temperature molding is performed by using a molding value range of 0.5MPa to 10MPa, preferably 3.125MPa, and the holding time is 5min to 30min, preferably 10min.
In step 8), the degree of vacuum<10 -3 Pa, sintering temperature is 355-395 ℃, preferably 390 ℃, and heat preservation time is 2-2.2 hours.
According to the technical scheme, the single pore structure of the porous oil storage medium is changed by utilizing the secondary mould pressing technology, so that the gradient storage of lubricating oil in the pores inside the porous oil storage medium is realized, and the continuous and stable release of the lubricating oil from the porous oil storage medium to the surface of the friction pair is promoted.
Compared with the prior art, the invention has the following characteristics and advantages:
the gradient pore porous oil storage medium with the surface specific texture is prepared by introducing a large pore diameter structure on a porous medium matrix which is communicated with a small pore diameter structure, and the large pore diameter and the small pore diameter in the surface texture and the internal texture are communicated with each other to form an oil storage and oil supply loop with a certain gradient.
Drawings
FIG. 1 is a schematic illustration of a small pore porous media pack being molded in a cavity of a mold; wherein, 1, polytetrafluoroethylene; 2. potassium sorbate; 3. a small-aperture porous medium mold; 4. a top pressing plate of the small-aperture porous medium die; 5. and (5) molding the small-aperture porous medium into a blank.
FIG. 2 is a schematic illustration of a large pore size porous medium mixture being molded in a cavity of a mold; wherein, 1, polytetrafluoroethylene; 2. potassium sorbate; 6. molding and pressing a large-aperture porous medium; 7. a large-aperture porous medium mold; 8. a top pressing plate of a large-aperture porous medium mould.
FIG. 3 is a schematic diagram of secondary molding after arranging a large-aperture porous medium molding blank on the upper surface of a small-aperture porous medium and filling the small-aperture porous medium with a mixed material; wherein, 1, polytetrafluoroethylene; 2. potassium sorbate; 3. a small-aperture porous medium mold; 4. a top pressing plate of the small-aperture porous medium die; 6. molding and pressing a large-aperture porous medium; 9. small pore porous media.
FIG. 4 is a schematic illustration of a gradient pore porous oil storage medium formed with a surface specific texture; wherein, 9. Small pore porous media; 10 large pore size porous media.
Description of the embodiments
Example 1
The preparation method of the gradient pore porous oil storage medium with the surface specific texture comprises the following steps:
1) Mixing polytetrafluoroethylene and potassium sorbate in proportion, wherein the mass fraction of the potassium sorbate accounts for 20% of the total mass of the mixture, and stirring in a mixer for 0.5 hour to fully and uniformly mix the mixture, namely the small-aperture porous medium mixture;
2) Mixing polytetrafluoroethylene and potassium sorbate in proportion, wherein the mass fraction of the potassium sorbate accounts for 80% of the total mass of the mixture, and stirring in a mixer for 0.5 hour to fully and uniformly mix the mixture, namely the large-aperture porous medium mixture;
3) Crushing the small-aperture porous medium mixture and the large-aperture porous medium mixture to powder below 10 microns by using a crusher respectively, and then placing the powder in a drying oven at 120 ℃ for 2 hours;
4) As shown in fig. 1, the crushed and dried small-aperture porous medium mixture is arranged in a die cavity of a small-aperture porous medium die 3, a top pressing plate 4 of the small-aperture porous medium die is molded by a universal testing machine, normal-temperature molding is performed by using a molding value of 9.5MPa, the pressure maintaining time is 20min, then the pressing plate 4 is removed to prepare a small-aperture porous medium molded compact 5, and the small-aperture porous medium molded compact 5 and the small-aperture porous medium die 3 are placed in a drying oven at 60 ℃ and dried for 48 hours;
5) As shown in fig. 2, the crushed and dried large-aperture porous medium mixture is arranged in a die cavity of a large-aperture porous medium die 7, a top pressing plate 8 of the large-aperture porous medium die is molded by a universal testing machine, normal-temperature molding is performed by using 3.125MPa for 15min of pressure maintaining time, then the top pressing plate 8 of the large-aperture porous medium die is removed to prepare a large-aperture porous medium molded blank 6, and the large-aperture porous medium molded blank 6 and the large-aperture porous medium die 7 are placed in a drying box at 60 ℃ for drying for 48 hours;
6) Placing the small-aperture porous medium die pressed blank 5 and the small-aperture porous medium die 3 into a vacuum sintering furnace, and vacuum degree<10 -3 Pa, sintering temperature 390 ℃, preserving heat for 2 hours, volatilizing and disappearing potassium sorbate in the vacuum sintering process of the small-aperture porous medium die compact, forming pores in the small-aperture porous medium die compact to form a small-aperture porous medium 9, cooling along with a furnace, and taking out the small-aperture porous medium 9 and the small-aperture porous medium die 3;
7) As shown in fig. 3, arranging large-aperture porous medium molded blanks 6 on the upper surface of a small-aperture porous medium 9 according to the actual part lubrication requirement and according to certain distribution (matrix or ring shape), filling small-aperture porous medium mixed materials in gaps around the small-aperture porous medium molded blanks after the arrangement is finished, performing secondary molding on a top pressing plate 4 of a small-aperture porous medium mold by using a universal testing machine, performing normal-temperature molding by using a molding machine of 3.125MPa, maintaining the pressure for 10min, and removing the top pressing plate 4 of the small-aperture porous medium mold;
8) Placing the molded blank after secondary molding in a vacuum sintering furnace, and vacuum degree<10 -3 Pa, sintering temperature 390 ℃, preserving heat for 2 hours, cooling along with a furnace, volatilizing and disappearing potassium sorbate in the vacuum sintering process of the molded blank, forming through pores in the molded blank, and enabling the pores of the first molded small-pore porous medium, the pores of the large-pore porous medium and the pores of the small-pore porous medium in the secondary molded blank to be mutually communicated to form the porous medium with specific surface texture characteristics;
9) Placing the porous medium with specific surface texture in lubricating oil, and placing under vacuum degree of 10 -3 In the Pa vacuum atmosphere, the vacuum oil storage is carried out for 24 hours, and the air in the pores in the porous medium is emptied, so that the lubricating oil can be fully filled into the large-pore-diameter pores and the small-pore-diameter pores in the porous medium, and the gradient pore-diameter porous oil storage medium with the surface specific texture can be prepared.
The gradient pore porous oil storage medium with the surface specific texture is prepared by introducing a large pore diameter structure on a porous substrate which is communicated with a small pore diameter structure, and the large pores and the small pores in the surface texture and the internal texture are communicated with each other to form an oil storage and oil supply loop with a certain gradient.
Example 2
The preparation method of the gradient pore porous oil storage medium with the surface specific texture comprises the following steps:
1) Mixing polytetrafluoroethylene and potassium sorbate according to a certain proportion, wherein the mass fraction of the potassium sorbate accounts for 10% of the total mass of the mixture, and stirring in a mixer for 1 hour to fully and uniformly mix the mixture, namely the small-aperture porous medium mixture;
2) Mixing polytetrafluoroethylene and potassium sorbate according to a certain proportion, wherein the mass fraction of the potassium sorbate accounts for 65% of the total mass of the mixture, and stirring in a mixer for 1 hour to fully and uniformly mix the mixture, namely the large-aperture porous medium mixture;
3) Crushing the small-aperture porous medium mixture and the large-aperture porous medium mixture to powder below 10 microns by using a crusher respectively, and then placing the powder in a drying oven at 115 ℃ for 2.2 hours;
4) Loading the crushed and dried small-aperture porous medium mixture into a die cavity of a die, performing die pressing on a top pressing plate of the small-aperture porous medium die by using a universal testing machine, performing normal-temperature die pressing by using a die pressing pressure of 20MPa for 10min, removing the pressing plate to prepare a small-aperture porous medium die pressing blank, and placing the small-aperture porous medium die pressing blank and the die into a 55 ℃ drying box for drying for 55 hours;
5) Loading the crushed and dried large-aperture porous medium mixture into a die cavity of a large-aperture porous medium die, performing die pressing on a top pressing plate of the large-aperture porous medium die by using a universal testing machine, performing normal-temperature die pressing by using a die pressing value range of 10MPa for 5min, removing the top pressing plate of the large-aperture porous medium die to prepare a large-aperture porous medium die pressing blank, and placing the large-aperture porous medium die pressing blank and the die in a 55 ℃ drying box for drying for 55 hours;
6) Placing the small-aperture porous medium die pressed blank and the die into a vacuum sintering furnace, and vacuum degree<10 -3 Pa, sintering temperature 355 ℃, heat preservation for 2.2 hours, volatilizing and disappearing potassium sorbate in the vacuum sintering process of the small-aperture porous medium die compact, forming pores in the small-aperture porous medium die compact so as to form a small-aperture porous medium, and taking out the small-aperture porous medium and the die after cooling along with a furnace;
7) Arranging large-aperture porous medium die pressed blanks according to a certain distribution (matrix or ring shape) on the upper surface of a small-aperture porous medium according to the lubrication requirement of an actual part, filling small-aperture porous medium mixed materials in gaps around the small-aperture porous medium after the arrangement is finished, performing secondary die pressing on a top pressing plate of a small-aperture porous medium die by using a universal testing machine, performing normal-temperature die pressing by using a die pressing machine of 1.5MPa, maintaining the pressure for 30min, and removing the top pressing plate;
8) Placing the molded blank after secondary molding in a vacuum sintering furnace, and vacuum degree<10 -3 Pa, sintering temperature is 355 ℃, heat preservation is carried out for 2.2 hours, after cooling along with a furnace, potassium sorbate volatilizes and disappears in the vacuum sintering process of the molded blank, through holes are formed in the molded blank, and the holes of the first molded small-aperture porous medium, the holes of the large-aperture porous medium and the holes of the small-aperture porous medium in the secondary molded blank are mutually communicated to form the porous medium with specific surface texture characteristics;
9) Placing the porous medium with specific surface texture characteristics in lubricating oilAnd placed under a vacuum of 10 -3 In the Pa vacuum atmosphere, the vacuum oil storage is carried out for 22 hours, and the air in the pores in the porous medium is emptied, so that the lubricating oil can be fully filled into the large-pore-diameter pores and the small-pore-diameter pores in the porous medium, and the gradient pore-diameter porous oil storage medium with the surface specific texture can be prepared.
Example 3
The preparation method of the gradient pore porous oil storage medium with the surface specific texture comprises the following steps:
1) Mixing polytetrafluoroethylene and potassium sorbate according to a certain proportion, wherein the mass fraction of the potassium sorbate accounts for 35% of the total mass of the mixture, and stirring in a mixer for 0.5 hour to fully and uniformly mix the mixture, namely the small-aperture porous medium mixture;
2) Mixing polytetrafluoroethylene and potassium sorbate according to a certain proportion, wherein the mass fraction of the potassium sorbate accounts for 90% of the total mass of the mixture, and stirring in a mixer for 0.5 hour to fully and uniformly mix the mixture, namely the large-aperture porous medium mixture;
3) Crushing the small-aperture porous medium mixture and the large-aperture porous medium mixture to powder below 10 microns by using a crusher respectively, and then placing the powder in a drying oven at 125 ℃ for 2 hours;
4) Loading the crushed and dried small-aperture porous medium mixture into a die cavity of a small-aperture porous medium die, performing die pressing on a top pressing plate of the small-aperture porous medium die by using a universal testing machine, performing normal-temperature die pressing by using a die pressing pressure of 45MPa, maintaining the pressure for 25min, removing the pressing plate to prepare a small-aperture porous medium die pressed compact, and placing the small-aperture porous medium die pressed compact and the die in a drying box at 65 ℃ for drying for 48 hours;
5) Loading the crushed and dried large-aperture porous medium mixture into a die cavity of a die, performing die pressing on a top pressing plate of the large-aperture porous medium die by using a universal testing machine, performing normal-temperature die pressing by using a die pressing pressure of 45MPa for 25min, removing the top pressing plate of the large-aperture porous medium die to prepare a large-aperture porous medium die pressed blank, and placing the large-aperture porous medium die pressed blank and the die in a drying box at 65 ℃ for drying for 48 hours;
6) Multiple small pore diametersThe hole medium mould pressed blank and the mould are placed in a vacuum sintering furnace, and the vacuum degree is high<10 -3 Pa, sintering temperature 395 ℃ and heat preservation for 2 hours, wherein potassium sorbate volatilizes and disappears in the vacuum sintering process of the small-aperture porous medium die compact, pores are formed in the small-aperture porous medium die compact so as to form a small-aperture porous medium 9, and the small-aperture porous medium and the die are taken out after cooling along with a furnace;
7) Arranging large-aperture porous medium die pressing blanks according to a certain distribution (matrix or ring shape) on the upper surface of a small-aperture porous medium according to the lubrication requirement of an actual part, filling small-aperture porous medium mixed materials in gaps around the small-aperture porous medium after the arrangement is finished, performing secondary die pressing on a top pressing plate of a small-aperture porous medium die by using a universal testing machine, performing normal-temperature die pressing by using a die pressing machine of 10MPa, maintaining the pressure for 15min, and removing the top pressing plate;
8) Placing the molded blank after secondary molding in a vacuum sintering furnace, and vacuum degree<10 -3 Pa, sintering temperature 395 ℃, preserving heat for 2 hours, cooling along with a furnace, volatilizing and disappearing potassium sorbate in the vacuum sintering process of the molded blank, forming through pores in the molded blank, and enabling the pores of the first molded small-pore porous medium to be mutually communicated with the pores of the large-pore porous medium and the pores of the small-pore porous medium in the secondary molded blank to form the porous medium with specific surface texture characteristics;
9) Placing the porous medium with specific surface texture in lubricating oil, and placing under vacuum degree of 10 -3 In the vacuum atmosphere of Pa, the vacuum oil storage is carried out for 26 hours, and the air in the pores in the porous medium is emptied, so that the lubricating oil can be fully filled into the large-pore-diameter pores and the small-pore-diameter pores in the porous medium, and the gradient pore-diameter porous oil storage medium with the surface specific texture can be prepared.
The above examples are only one of the preferred embodiments of the present invention, and the ordinary changes and substitutions made by those skilled in the art within the scope of the technical embodiments of the present invention are included in the scope of the present invention.
Claims (10)
1. The preparation method of the gradient pore porous oil storage medium with the surface specific texture is characterized by comprising the following steps of:
1) Mixing polytetrafluoroethylene and potassium sorbate in proportion, wherein the mass fraction of the potassium sorbate accounts for 5% -40% of the total mass of the mixture, and fully stirring and uniformly mixing in a mixer to obtain the small-aperture porous medium mixture;
2) Mixing polytetrafluoroethylene and potassium sorbate in proportion, wherein the mass fraction of the potassium sorbate accounts for 65% -95% of the total mass of the mixture, and fully stirring and uniformly mixing in a mixer to obtain the large-aperture porous medium mixture;
3) Crushing the small-aperture porous medium mixed material and the large-aperture porous medium mixed material by using a crusher respectively, and then drying;
4) Loading the crushed and dried small-aperture porous medium mixture into a die cavity of a die, performing die pressing to prepare a small-aperture porous medium die pressed compact, and placing the small-aperture porous medium die pressed compact and the die into a drying oven for drying;
5) The crushed and dried large-aperture porous medium mixture is arranged in a die cavity of a die, die pressing is carried out to prepare a large-aperture porous medium die pressed compact, and the large-aperture porous medium die pressed compact and the die are placed in a drying oven for drying;
6) Placing the small-aperture porous medium die compact and a die into a vacuum sintering furnace for sintering, volatilizing and disappearing potassium sorbate in the vacuum sintering process of the small-aperture porous medium die compact, forming pores in the small-aperture porous medium die compact to form a small-aperture porous medium, cooling along with the furnace, and taking out the small-aperture porous medium and the die;
7) Arranging a large-aperture porous medium molding blank on the upper surface of the small-aperture porous medium, filling small-aperture porous medium mixed materials in gaps around the large-aperture porous medium after the arrangement is finished, and then performing secondary molding;
8) Placing the molded blank after secondary molding in a vacuum sintering furnace for sintering, and then cooling along with the furnace to obtain a porous medium with specific surface texture characteristics;
9) And placing the porous medium with the specific surface texture characteristics into lubricating oil, and storing the oil in vacuum for 22-26 hours to obtain the gradient pore porous oil storage medium with the specific surface texture.
2. The method for preparing the gradient pore porous oil storage medium with the surface specific texture according to claim 1, wherein in the step 1), the mass fraction of the potassium sorbate accounts for 20% of the total mass of the mixture, and the stirring time is 0.5-1 hour.
3. The method for preparing the gradient pore porous oil storage medium with the surface specific texture according to claim 1, wherein in the step 2), the mass fraction of the potassium sorbate accounts for 80% of the total mass of the mixture, and the stirring time is 0.5-1 hour.
4. The method for preparing the gradient pore porous oil storage medium with the surface specific texture according to claim 1, wherein in the step 3), the small pore porous medium mixture and the large pore porous medium mixture are respectively crushed into powder below 10 micrometers, the drying temperature is 115 ℃ to 125 ℃, and the drying time is 2 hours to 2.2 hours.
5. The method for preparing the gradient pore porous oil storage medium with the surface specific texture according to claim 1, wherein in the step 4) and the step 5), normal-temperature mould pressing is adopted, the mould pressing value range is 1-50 MPa, the pressure maintaining time is 5-30 min, the drying temperature is 55-65 ℃, and the drying time is 48-55 hours.
6. The method for preparing a gradient pore porous oil storage medium with surface specific texture according to claim 5, wherein in step 4), the mold pressing is 9.5MPa, and the dwell time is 20min; in step 5), the molding was 3.125MPa and the dwell time was 15min.
7. The method for preparing a gradient pore porous oil storage medium with surface specific texture according to claim 1,in step 6), the degree of vacuum<10 -3 Pa, sintering temperature is 355-395 ℃, and heat preservation time is 2-2.2 hours.
8. The method for preparing the gradient pore porous oil storage medium with the surface specific texture according to claim 1, wherein in the step 7), normal-temperature mould pressing is adopted, the mould pressing value range is 0.5-10 MPa, and the pressure maintaining time is 5-30 min.
9. The method for preparing a gradient pore porous oil storage medium with surface specific texture according to claim 1, wherein in step 8), the degree of vacuum is<10 -3 Pa, sintering temperature is 355-395 ℃, and heat preservation time is 2-2.2 hours.
10. The gradient pore porous oil storage medium with surface specific texture obtained by the preparation method according to any one of claims 1-9.
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