CN110028788A - A kind of composite polyimide material, porous polyimide retainer and preparation method thereof, bearing - Google Patents
A kind of composite polyimide material, porous polyimide retainer and preparation method thereof, bearing Download PDFInfo
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- CN110028788A CN110028788A CN201810027153.3A CN201810027153A CN110028788A CN 110028788 A CN110028788 A CN 110028788A CN 201810027153 A CN201810027153 A CN 201810027153A CN 110028788 A CN110028788 A CN 110028788A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Rolling Contact Bearings (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The present invention relates to a kind of composite polyimide materials, porous polyimide retainer and preparation method thereof, bearing.Composite polyimide material of the invention mainly consists of the following mass percentage components: equal benzene polyimides 55~85%, thermoplastic polyimide 15~45%；The thermoplastic polyimide is at least one of ketone acid anhydride type polyimides, ether anhydride type polyimides.Composite polyimide material of the invention, big with hardness, rigid strong and insoluble equal benzene polyimides and thermoplastic polyimide are compounded, when so that it being used to prepare porous polyimide retainer, can be improved the high-tensile of porous polyimide retainer, high rigidity, high-wearing feature and it is good it is durothermic simultaneously, reduce aperture and the thermal expansion coefficient of porous polyimide retainer, be conducive to the release and absorption of lubricating oil, it is lubricated for a long time conducive to bearing, can be widely applied for long-life momentum bearing retainer field.
Description
Technical field
The present invention relates to a kind of composite polyimide materials, porous polyimide retainer and preparation method thereof, bearing, belong to
In composite polyimide material technical field.
Background technique
Porous polyimide retainer is high with tensile strength, chemical stability is good, tribological property is excellent, resistance to spatial loop
The advantages that border is good provides long-term, good, constantly oil lubrication in use, is widely used in high-precision and requires to mention
Have in the long-life momentum wheel bearing of particular/special requirement for continuous lubrication etc..
As host customer further increases momenttum wheel bearing life and reliability requirement, existing porous polyimide
Material is unable to satisfy demand in the indexs such as aperture and its control that narrows, wearability, has become limitation momenttum wheel bearing life
One of with the main bottleneck of reliability, there is an urgent need to a kind of porous polyimide materials of function admirable.
In the prior art, with9000 polyimide materials are that raw material can using hip moulding technique
It is smaller to obtain aperture, and wearability and the good porous polyimide retainer of temperature tolerance, for best porous of performance in the world
Polyimides retainer.Domestic porous polyimide retainer is mainly using thermoplastic polyimide as raw material, using constant volume work
Skill or limit pressing process obtain, using the porous polyimide retainer aperture of material preparation not easy to control, dispersion compared with
Greatly, it is difficult to meet the needs of bearing long-life.
Currently, there are many ways to preparing porous polyimide retainer, as Authorization Notice No. is CN103507193B
Chinese invention patent discloses a kind of porous polyimide composite holder pipe preheating limit pressing process, the pressing process
First by raw material polyimides vacuum drying treatment, and polyimides mixture is made by weight, mixture is packed into
It quickly removes in mold and after constant temperature processing and carries out limit pressurization, pressure maintaining, sinter molding in program control type sintering furnace is put into after demoulding.
Using porous polyimide composite holder pipe density, pore radius and adjustable porosity range made from above-mentioned pressing process
Extensively.But due to technical matters, so that being difficult to surely using the bore dia of retainer blank tube material made from the above method
Fixed control is at 1.0 μm, and the dispersion in aperture is larger, and wearability is relatively poor.
Summary of the invention
The object of the present invention is to provide a kind of composite polyimide materials, can improve porous polyimide retainer
Wearability and the durothermic aperture and realization for simultaneously, reducing porous polyimide material narrow control, for the bearing long-life
Material foundation is established in realization.
The present invention also provides a kind of porous polyimide retainers and preparation method thereof, and sub- using the porous polyamides
The bearing of amine retainer.
In order to achieve the goal above, technical solution used by composite polyimide material of the invention is:
A kind of composite polyimide material, mainly consists of the following mass percentage components: equal benzene polyimides 55~
85%, thermoplastic polyimide 15~45%；The thermoplastic polyimide is ether anhydride type polyimides, ketone acid anhydride type polyimides
At least one of.
Composite polyimide material of the invention, big with hardness, rigid strong and insoluble equal benzene polyimides and thermoplasticity
Polyimides is compounded, and when so that it being used to prepare porous polyimide retainer, can be improved porous polyimide holding
The tensile strength of frame, hardness, wearability and it is good it is durothermic simultaneously, reduce the bore dia of porous polyimide retainer, hole
Diameter distributed area is narrowed, and thermal expansion coefficient is minimized, and is conducive to the release and absorption of lubricating oil, is moistened for a long time conducive to bearing
It is sliding, it can be widely applied for long-life momentum bearing retainer field.
The mesh number of the equal benzene polyimides is not less than 400 mesh, and the mesh number of the thermoplastic polyimide is not less than 400
Mesh.Mesh number not less than 400 mesh refer to polyimides can by sieve minimum mesh number be 400 mesh.
The ether anhydride type polyimides is at least one of monoether type polyimides, diether type polyimides.
Technical solution used by porous polyimide retainer of the invention are as follows:
A kind of porous polyimide retainer, is mainly made of the raw material of following mass percent: equal benzene polyimides 55
~85%, thermoplastic polyimide 15~45%；The thermoplastic polyimide is ether anhydride type polyimides, ketone acid anhydride type polyamides Asia
At least one of amine.
Porous polyimide retainer of the invention, with cyclic annular tensile strength is high, bore dia is small, wearability is good, hardness
Greatly, the advantages that thermal expansion coefficient is small, heat-resist.
The porosity of the porous polyimide retainer is 10~30%.
The ether anhydride type polyimides is at least one of monoether type polyimides, diether type polyimides.
Technical solution used by the preparation method of porous polyimide retainer of the invention are as follows:
A kind of preparation method of above-mentioned porous polyimide retainer, comprising the following steps: take the equal benzene polyamides of formula ratio
Imines Moulding powder, thermoplastic polyimide molding powder mix, and obtain polyimides mixture, then by polyimides mixture heat
It is molded to get.
The preparation method of porous polyimide retainer of the invention, simple process are kept improving porous polyimide
The wearability of frame and it is durothermic simultaneously, the distributed area in the product aperture that narrows, and at low cost is easy to promote and utilize.
The mesh number of the equal benzene polyimide molding powder is not less than 400 mesh, the mesh of the thermoplastic polyimide molding powder
Number is not less than 400 mesh.Mesh number can lead to not less than the equal benzene polyimide molding powder of 400 purposes and thermoplastic polyimide molding powder
The sieve (such as 500 mesh, 600 mesh etc.) that mesh number is crossed not less than 400 mesh is sieved, and extracting screen underflow obtains.
The hot-forming pressure is 900~1100kg/cm2.The hot-forming temperature is 350~400 DEG C.Institute
Stating the hot-forming time is 30~60min.
Before hot-forming, polyimides mixture is filled into and is kept in frame mould, by adjusting porous polyimide guarantor
The density of frame is held to regulate and control the porosity of porous polyimide retainer.The hole reached according to needed for porous polyimide retainer
Gap rate calculates the density of porous polyimide retainer, in conjunction with the internal diameter, outer diameter and height of porous polyimide retainer, really
The quality of polyimides mixture needed for customizing standby corresponding porous polyimide retainer.
The holding frame mould includes housing, mandrel, formed punch and pedestal, and the housing, mandrel and pedestal constitute retainer
Die cavity.Set the internal diameter of retainer as d, outer diameter D, be highly H, then the internal diameter of the housing=outer diameter D+3mm, described
The outer diameter of mandrel=internal diameter d-3mm, the housing height=mandrel height >=3H.The outer diameter of the formed punch with it is described
The internal diameter of housing matches, and the internal diameter of the formed punch and the outer diameter of the mandrel match, the internal diameter of the pedestal and the core
The outer diameter of axis matches, and the outer diameter of the pedestal and the internal diameter of the housing match.
The desired amount of polyimides mixture is filled into holding frame mould, mold clamping, and add on die core axle
The limited block of certain altitude, so that hPedestal+H+hFormed punch=hMandrel+hLimit, then carry out hot-forming.
It is described hot-forming to be carried out on programmable heat press.The temperature-controlled precision of the programmable heat press is ± 1 DEG C.
It is described it is hot-forming be that polyimides mixture is forced into 900~1100kg/cm2, then pressure maintaining, in pressure maintaining
It is warming up to 350~400 DEG C simultaneously, and in 350~400 DEG C of heat preservations, 30~60min of pressure maintaining.The time of the heating is not shorter than
60min.Preferably, the time of the heating is 60~80min.
After hot-forming, the temperature of frame mould to be held carries out demoulding processing when being lower than 240 DEG C.
Before equal benzene polyimide molding powder and thermoplastic polyimide molding powder are mixed, by equal benzene polyimide molding powder
In 200~240 DEG C of dry 1~4h.
Before equal benzene polyimide molding powder and thermoplastic polyimide molding powder are mixed, by thermoplastic polyimide molding
Powder is in 120~180 DEG C of dry 1~4h.
The drying of equal benzene polyimides and thermoplastic polyimide carries out in drying box.It is cooled to room temperature after drying.
Equal benzene polyimide molding powder and thermoplastic polyimide molding powder can be mixed with the following method: by equal benzene
Polyimide molding powder and thermoplastic polyimide molding powder are put into stirring 3~5 times in machine mixer together, stir every time
Time control is in 20~30s, and the revolving speed of machine mixer is controlled in 10000~12000r/min when stirring every time.Judge polyamides
Whether equal benzene polyimide molding powder and thermoplastic polyimide molding powder mix in imines compound material, and micro- sem observation can be used
The color difference of polyimides mixture, without obvious color difference to get uniformly mixed polyimides mixture.For example, not for mesh number
Less than the equal benzene polyimide molding powder of 400 purposes and thermoplastic polyimide molding powder, can be shown using 20 times or 40
Micro mirror is observed, and judges whether to mix.Light yellow, thermoplastic polyimide molding powder is presented in equal benzene polyimide molding powder
In, monoether anhydride polyimides is in glassy yellow, and bis ether acid anhydride polyimides is in field gray, and ketone acid anhydride type polyimides is in light yellow.
Before hot-forming, polyimides mixture used is sealed preservation.
Technical solution used by bearing of the invention are as follows:
A kind of bearing using above-mentioned porous polyimide retainer.
Bearing of the invention uses above-mentioned polyimides retainer, have light, hardness is big, wearability and temperature tolerance are good,
The advantages of long service life.
Specific embodiment
Below in conjunction with specific embodiment, further description of the technical solution of the present invention.
Equal benzene polyimide molding powder and single, double ether anhydride type polyimide molding powder employed in specific embodiment and
Ketone acid anhydride type polyimide molding powder is commercial product, in which: the trade mark of equal benzene polyimide molding powder is P84NT2, purchased from win
Create industrial group；The trade mark of monoether anhydride type polyimide molding powder is YS20, is purchased from Shanghai synthetic resin research institute；Bis ether acid anhydride type
The trade mark of polyimide molding powder is HI-P-100, is purchased from Changchun Gao Qi polyimide material Co., Ltd；Ketone acid anhydride type polyamides is sub-
The trade mark of amine Moulding powder is P84NT1, creates industrial group purchased from winning.
It the internal diameter d=28.2mm of porous polyimide retainer, outer diameter D=35.6mm, is highly H=6.6mm；Hot pressing
Equipment used by forming is programmable heat press, and temperature-controlled precision is ± 1 DEG C.
It includes housing, mandrel, formed punch and pedestal, housing, mandrel and pedestal structure that frame mould is kept used by hot-forming
At retainer die cavity.Keep internal diameter=retainer outer diameter D+3mm=38.6mm of the housing of frame mould, outer diameter=holding of mandrel
Frame internal diameter d-3mm=25.2mm, housing height=mandrel height >=3 times retainer height H=19.8mm, the outer diameter of formed punch with
The internal diameter of housing matches, and the internal diameter of formed punch and the outer diameter of mandrel match, and the internal diameter of pedestal and the outer diameter of mandrel match, bottom
The outer diameter of seat and the internal diameter of housing match.Mandrel is equipped with the limited block that extreme lower position is pushed for limiting formed punch, limited block
Height hLimitIt can be calculated according to following formula: hLimit=H+hPedestal+hFormed punch-hMandrel.During hot-forming, formed punch is pushed
When contacting with limited block, the height of retainer die cavity is consistent with the height of porous polyimide retainer.
The quality of the polyimides mixture for being used to prepare porous polyimide retainer in each embodiment can refer to
Following methods are determined: it is assumed that the porosity of porous polyimide retainer is 15%, wall thickness 10mm, being calculated porous poly-
Theoretical density ρ=ρ of acid imide retainerEntity× (1-15%)；Wherein,
Or
m1For the mass percent of equal benzene polyimides；Other situations can refer to the above method and be calculated；Then foundation
The height of the retainer set calculates the volume V=π (D of porous polyimide retainer as the size of h, internal diameter d, outer diameter D2-
d2)/4 × h finally obtains the quality m=ρ V of polyimides mixture needed for preparing porous polyimide retainer.
Embodiment 1
The composite polyimide material of the present embodiment, consists of the following mass percentage components: equal benzene polyimides mould
Molding powder 70%, monoether anhydride type polyimide molding powder 30%.
The porous polyimide retainer of the present embodiment is made of the raw material of following mass percent: equal benzene polyimides mould
Molding powder 70%, monoether anhydride type polyimide molding powder 30%；The porosity of porous polyimide retainer is 20%.
The preparation method of the porous polyimide retainer of the present embodiment, comprising the following steps:
1) equal benzene polyimide molding powder is put into drying box, in 240 DEG C of dry 2h, is cooled to room temperature, then cross 400
Screenings is sealed spare by mesh；
Monoether anhydride type polyimide molding powder is put into drying box, in 150 DEG C of dry 2h, is cooled to room temperature, then mistake
Screenings is sealed spare by 400 meshes；
2) respectively from the equal benzene polyimide molding powder being sealed and the monoether anhydride type polyimide molding being sealed
In powder, the equal benzene polyimide molding powder of formula ratio, monoether anhydride type polyimide molding powder is taken to be put into machine mixer together
Stirring 3 times, the time stirred every time are 30s, and the revolving speed stirred every time is 12000r/min；Every time after stirring, four are used
Ten power microscopes observe the color difference of mixture, and there are also more apparent color difference after preceding stirring twice, third time obtains nothing after stirring
The polyimides mixture of obvious color difference；
3) resulting polyimides mixture is filled into retainer die cavity, is then molded, set porous polyimide
The porosity of retainer is 20%, calculates limited block height, is put into limited block, then frame mould will be kept to be transferred to programmable heat
Press is forced into 1000kg/cm2, then start heating schedule, be heated to 375 DEG C by 80min, then keep the temperature 30min, unload
Pressure, take out keep frame mould natural cooling, demoulded when at a temperature below 240 DEG C to get.
The bearing of the present embodiment is made using the porous polyimide retainer conventional method of the present embodiment.
Embodiment 2
The composite polyimide material of the present embodiment, consists of the following mass percentage components: equal benzene polyimides mould
Molding powder 55%, bis ether acid anhydride type polyimide molding powder 45%.
The porous polyimide retainer of the present embodiment, is made of the raw material of following mass percent: equal benzene polyimides
Moulding powder 55%, bis ether acid anhydride type polyimide molding powder 45%；The porosity of porous polyimide retainer is 10%.
The preparation method of the porous polyimide retainer of the present embodiment, comprising the following steps:
1) equal benzene polyimide molding powder is put into drying box, in 240 DEG C of dry 1h, is cooled to room temperature, then cross 400
Screenings is sealed spare by mesh；
Bis ether acid anhydride type polyimide molding powder is put into drying box, in 180 DEG C of dry 1h, is cooled to room temperature, then mistake
Screenings is sealed spare by 400 meshes；
2) respectively from the equal benzene polyimide molding powder being sealed and the bis ether acid anhydride type polyimide molding being sealed
In powder, the equal benzene polyimide molding powder of formula ratio, bis ether acid anhydride type polyimide molding powder is taken to be put into machine mixer together
Stirring 3 times, the time stirred every time are 30s, and the revolving speed stirred every time is 12000r/min；Every time after stirring, four are used
Ten power microscopes observe the color difference of mixture, and there are also more apparent color difference after preceding stirring twice, third time obtains nothing after stirring
The polyimides mixture of obvious color difference；
3) resulting polyimides mixture is filled into retainer die cavity, is then molded, set porous polyimide
The porosity of retainer is 10%, calculates limited block height, is put into limited block, and frame mould will be kept to be transferred to programmable heat press
In, it is forced into 900kg/cm2, then start heating schedule, be heated to 350 DEG C by 70min, then keeps the temperature 60min, release,
Take out keep frame mould natural cooling, demoulded when at a temperature below 240 DEG C to get.
The bearing of the present embodiment is made using the porous polyimide retainer conventional method of the present embodiment.
Embodiment 3
The composite polyimide material of the present embodiment, consists of the following mass percentage components: equal benzene polyimides mould
Molding powder 85%, ketone acid anhydride type polyimide molding powder 15%.
The porous polyimide retainer of the present embodiment, is made of the raw material of following mass percent: equal benzene polyimides
Moulding powder 85%, ketone acid anhydride type polyimide molding powder 15%；The porosity of porous polyimide retainer is 28%.
The preparation method of the porous polyimide retainer of the present embodiment, comprising the following steps:
1) equal benzene polyimide molding powder is put into drying box, in 200 DEG C of dry 4h, is cooled to room temperature, then cross 400
Screenings is sealed spare by mesh；
Ketone acid anhydride type polyimide molding powder is put into drying box, in 120 DEG C of dry 4h, is cooled to room temperature, then crosses 400
Screenings is sealed spare by mesh；
2) respectively from the equal benzene polyimide molding powder being sealed and the ketone acid anhydride type polyimide molding powder being sealed
In, take the equal benzene polyimide molding powder of formula ratio, ketone acid anhydride type polyimide molding powder to be put into stirring 5 in machine mixer together
Secondary, the time stirred every time is 20s, and the revolving speed stirred every time is 10000r/min；
Every time after stirring, using the color difference of 40 power microscopes observation mixture, there are also more after preceding four stirrings
Apparent color difference obtains the polyimides mixture without obvious color difference after the 5th stirring；
3) resulting polyimides mixture is filled into retainer die cavity, is then molded, set porous polyimide
The porosity of retainer is 28%, calculates limited block height, is put into limited block, then frame mould will be kept to be transferred to programmable heat
In press, it is forced into 1100kg/cm2, then start heating schedule, be heated to 400 DEG C by 65min, then keep the temperature 45min,
Release, take out keep frame mould natural cooling, demoulded when at a temperature below 240 DEG C to get.
The bearing of the present embodiment is made using the porous polyimide retainer conventional method of the present embodiment.
Embodiment 4
The present embodiment composite polyimide material, consists of the following mass percentage components: equal benzene polyimide molding
Powder 65%, ketone acid anhydride type polyimide molding powder 20%, monoether anhydride type polyimide molding powder 15%.
The porous polyimide retainer of the present embodiment, is made of the raw material of following mass percent: equal benzene polyimides
Moulding powder 65%, ketone acid anhydride type polyimide molding powder 20%, monoether anhydride type polyamides Asia Moulding powder 15%；Polyimides retainer
Porosity is 20%.
The preparation method of the porous polyimide retainer of the present embodiment, comprising the following steps:
1) equal benzene polyimide molding powder is put into drying box, in 240 DEG C of dry 2h, is cooled to room temperature, then cross 400
Screenings is sealed spare by mesh；
Ketone acid anhydride type polyimide molding powder is put into drying box, in 150 DEG C of dry 2h, is cooled to room temperature, then crosses 400
Screenings is sealed spare by mesh；
Monoether anhydride type polyimide molding powder is put into drying box, in 150 DEG C of dry 2h, is cooled to room temperature, then mistake
Screenings is sealed spare by 400 meshes；
2) respectively from the equal benzene polyimide molding powder being sealed, the ketone acid anhydride type polyimide molding powder being sealed and
In the monoether anhydride type polyimide molding powder being sealed, take the equal benzene polyimide molding powder of formula ratio, ketone acid anhydride type polyamides sub-
Amine Moulding powder and monoether anhydride type polyimide molding powder are put into stirring 3 times, the time stirred every time in machine mixer together and are
30s, the revolving speed stirred every time are 12000r/min；Every time after stirring, the color of 40 power microscopes observation mixture is used
Difference, there are also more apparent color difference after preceding stirring twice, third time obtains the polyimides mixture without obvious color difference after stirring；
3) resulting polyimides mixture is filled into retainer die cavity, is then molded, set porous polyimide
The porosity of retainer is 20%, calculates limited block height, is put into limited block, then frame mould will be kept to be transferred to programmable heat
Press is forced into 1000kg/cm2, then start heating schedule, be heated to 375 DEG C by 80min, then keep the temperature 30min, unload
Pressure, take out keep frame mould natural cooling, demoulded when at a temperature below 200 DEG C to get.
The bearing of the present embodiment is made using the porous polyimide retainer conventional method of the present embodiment.
By the porous polyimide retainer of Examples 1 to 4 withThe performance of 9000 porous polyimide retainers
It is compared, as shown in table 1.
The porous polyimide retainer of 1 Examples 1 to 4 of table with9000 retainer performances compare
By data in table 1 it is found that Examples 1 to 4 porous polyimide keeps frame material bore dia to reach 0.7~1.4 μm,
Wearability is greatly improved, and has the characteristics that cyclic annular tensile strength compared with high, hardness is big, thermal expansion coefficient is small, heat-resist, with the world
Upper performance is best9000 porous polyimide retainer performances are suitable.
Composite polyimide material of the invention is high with cyclic annular tensile strength, hardness is big, thermal expansion coefficient is small, heat resistance
The features such as good, can be used as long-life bearing retainer；Porous polyimide retainer bore dia is small, conducive to lubricating oil release and
It absorbs, wearability is greatly improved, is conducive to bearing and lubricates for a long time, can be widely applied to long-life momenttum wheel field of bearings.
Claims (10)
1. a kind of composite polyimide material, it is characterised in that: mainly consist of the following mass percentage components: equal benzene polyamides
Imines 55~85%, thermoplastic polyimide 15~45%；The thermoplastic polyimide is ether anhydride type polyimides, ketone acid anhydride type
At least one of polyimides.
2. composite polyimide material according to claim 1, feature is being: the mesh number of the equal benzene polyimides
Not less than 400 mesh, the mesh number of the thermoplastic polyimide is not less than 400 mesh.
3. a kind of porous polyimide retainer, it is characterised in that: be mainly made of the raw material of following mass percent: equal benzene is poly-
Acid imide 55~85%, thermoplastic polyimide 15~45%；The thermoplastic polyimide is ether anhydride type polyimides, ketone acid anhydride
At least one of type polyimides.
4. porous polyimide retainer according to claim 3, it is characterised in that: the porous polyimide retainer
Porosity be 10~30%.
5. a kind of preparation method of porous polyimide retainer as claimed in claim 3, it is characterised in that: including following step
It is rapid: it takes the equal benzene polyimide molding powder of formula ratio, thermoplastic polyimide molding powder to mix, obtains polyimides mixture,
Then by polyimides mixture it is hot-forming to get.
6. the preparation method of porous polyimide retainer according to claim 5, it is characterised in that: the equal benzene polyamides
The mesh number of imines Moulding powder is not less than 400 mesh, and the mesh number of the thermoplastic polyimide molding powder is not less than 400 mesh.
7. the preparation method of porous polyimide retainer according to claim 5, it is characterised in that: described hot-forming
Temperature be 350~400 DEG C, pressure be 900~1100kg/cm2。
8. according to right want 5 or 7 described in porous polyimide retainer preparation method, it is characterised in that: it is described to be hot pressed into
Type is that polyimides mixture is forced into 900~1100kg/cm2, then pressure maintaining is warming up to 350~400 while pressure maintaining
DEG C, and in 350~400 DEG C of heat preservations, 30~60min of pressure maintaining.
9. the preparation method of porous polyimide retainer according to claim 5, it is characterised in that: equal benzene polyamides is sub-
Before amine Moulding powder and thermoplastic polyimide molding powder mixing, by equal benzene polyimide molding powder 200~240 DEG C dry 1~
4h, by thermoplastic polyimide molding powder in 120~180 DEG C of dry 1~4h.
10. a kind of bearing using porous polyimide retainer as claimed in claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810027153.3A CN110028788B (en) | 2018-01-11 | 2018-01-11 | Polyimide composite material, porous polyimide retainer, preparation method of porous polyimide retainer and bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810027153.3A CN110028788B (en) | 2018-01-11 | 2018-01-11 | Polyimide composite material, porous polyimide retainer, preparation method of porous polyimide retainer and bearing |
Publications (2)
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| CN113510891A (en) * | 2021-04-23 | 2021-10-19 | 中国科学院兰州化学物理研究所 | Two-stage hole polyimide material, preparation method thereof, two-stage hole polyimide retainer and application thereof |
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