CN1328320C - Sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof - Google Patents
Sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof Download PDFInfo
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- CN1328320C CN1328320C CNB2005100401239A CN200510040123A CN1328320C CN 1328320 C CN1328320 C CN 1328320C CN B2005100401239 A CNB2005100401239 A CN B2005100401239A CN 200510040123 A CN200510040123 A CN 200510040123A CN 1328320 C CN1328320 C CN 1328320C
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Abstract
The present invention relates to a sliding blade of an air compressor made from a thermoplastic polyimide group and a preparation method thereof. The sliding blade is prepared by using thermoplastic polyimide (TPI) as an adhesive and filling the TPI with solid lubricants, such as reinforcement fibers, graphite, etc.; a mechanical mixing method is adopted for preparing a composite powder material, and an improved pressure forging process is utilized for shaping. Compared with the prior art, the sliding blade of the air compressor of the present invention has the characteristics of abrasive resistance, high temperature resistance, etc., simple compounding mode and processing mode so as to greatly improve the production efficiency.
Description
Technical field
The present invention relates to a kind of sliding blade of air compressor made and preparation method thereof, relate in particular to a kind of sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof.
Background technology
The tradition slide plate is to be formed through mechanical workout by metals such as graphite material or grey cast irons, be applied in all kinds of air compressor machines as rotating seal, but appearance (as cement bulk transport trolley air compressor machine) along with high-power air compressor machine, the tradition slide plate can not meet the demands, so the resin base slide plate occurred.
Compare with traditional slide plate, the resin base slide plate has the high characteristics of flexural strength height, shock strength of heat conduction, self-lubricating and the resin of graphite simultaneously, so have wide application prospects on high-power air compressor machine and vacuum pump.
Chinese invention patent [application publication number CN1097433A] relates to a kind of preparation of modified high-temperature and wear-proof phenolic resin.This material is matrix material with the modified phenolic, and woven asbesto adopts hexamethylenetetramine as solidifying agent for strengthening high-abrasive material, has added auxiliary agent such as coupling agent, thickening material, lubricant and magnesium oxide, Graphite Powder 99 filler simultaneously.But owing to adopt the more weak relatively resol of resistance to elevated temperatures, thereby limited its use range as body material (the life-time service temperature is about 100 ℃).
It is skeleton with the fibrous magnesium silicate that Chinese invention patent [application publication number CN1407015A] is mentioned a kind of, and resol is matrix material, the novel resin-based composite material that packing lubrication agent, toughner, reinforcing agent, anti-aging agent etc. are made.This material has advantages such as density is low, frictional coefficient is little, thermal expansivity is little, and metals such as alternative grey cast iron are used for the air compressor slide plate, significantly improve its product over-all properties, prolong its work-ing life.Big quantity research shows that asbestos material has carcinogenesis, and it is subjected to strict restriction as building and friction materials, thereby is not suitable as the main raw of slide plate.
United States Patent (USP) [number of patent application: 0040126263] is mentioned a kind of improving one's methods at fiber filled resin base slide plate.Make the characteristics of linear reciprocating according to slide plate in real work, fiber is arranged in order along direction of motion, graphite or resin matrix are filled in the back, hot-forming, thereby make vane motion more level and smooth, reduced wearing and tearing and the vibrations in the process, improved compressor performance.This kind method is obvious to the effect of high-content continuous fibre filled resin base slide plate improved performance, but for low levels or chopped strand, its fiber arranged in advance technology has difficulties, and can cause that the mixing of material is inhomogeneous simultaneously.
United States Patent (USP) [application publication number: 20030024380] is equal to Japanese Patent [application publication number: 2001-235928] after recognizing the good high temperature resistant and self-lubricating property of thermoplastic polyimide, proposes a kind of metal slide plate and manufacture method thereof that contains the thermoplastic polyimide coating.It is on the basis of adopting the thermoplastic polyimide powder, add the solid lubricant tetrafluoroethylene, utilize the method for electrostatic spraying or splash to apply slip coating at metal material surface, thereby reduced the frictional wear in the slide plate use, the performance and the manufacturing process that have improved compressor are simple relatively.Because its slide plate adopts metallic matrix, density is much larger than the resin base slide plate, and its quality increases to some extent, and then has strengthened the power loss of compressor.Simultaneously, the life-span of slide plate be subjected to a great extent coat-thickness and with the influence of metallic matrix cohesive strength, and the bonding degree of general polymerization thing material and metallic substance is less and adopt electrostatic spraying or the coat-thickness of spray method preparation is restricted, thereby reduced the life-span of slide plate, increased use cost.
Summary of the invention
Technical problem to be solved by this invention is poor in order to overcome above-mentioned sliding blade of air compressor made over-all properties, the shortcoming that life-span is short and propose a kind of with the exsertile thermoplastic polyimide of processibility wear-resisting as binding agent, the thermoplastic polyimide the sliding blade of air compressor made high temperature resistant and life-span is long, another technical problem to be solved by this invention is complicated at present sliding blade of air compressor made production process, most of polyimide is insoluble not molten, the machine-shaping difficulty, and problems such as production efficiency is lower and proposed a kind of outstanding with processing characteristics, good fluidity thermoplastic polyimide as binding agent, adopt the mode of mechanically mixing to prepare composite powder, and utilize the preparation method who improves the hot press method moulding.
Technical scheme of the present invention is:
A kind of sliding blade of air compressor made from thermoplastic polyimide group is characterized in that the material composition and the weight percentage of this slide plate is as follows:
Graphite: 40～80%
Thermoplastic polyimide (TPI): 20%～40%
Fortifying fibre: 0%～10%
Solid lubricant: 0%～10%
Wherein thermoplastic polyimide is that the fundamental property of thermoplastic polyimide resin is: flexural strength 150～190MPa, and tensile strength 70～110MPa, second-order transition temperature is 〉=250 ℃, shock strength 20～50kJ/m
2, the GCPI that preferred Changzhou extensively becomes novel plastic company limited to produce
TMPowder, it not only has performances such as excellent heat resisting, mechanics, dielectric, corrosion resistant and radioprotective, also shows remarkable hot-work characteristic, can adopt hot moulding, extrude and the injecting method moulding.
Described fortifying fibre is a kind of of carbon fiber or glass fibre or both mixtures.
Described solid lubricant is a kind of of tetrafluoroethylene or molybdenumdisulphide or both mixtures.
A kind of method for preparing above-mentioned sliding blade of air compressor made from thermoplastic polyimide group, it is characterized in that adopting the method for mechanically mixing to prepare composite powder, and on the basis of traditional direct heat mould pressing method, improve technology, before and after hot pressing, add the cold pressing treatment process earlier and carry out moulding, thereby reduced molding time.With the graphite of weight percentage 40～80%, 20%～40% thermoplastic polyimide (TPI), 0%～10% fortifying fibre and 0%～10% solid lubricant mechanically mixing, the blended composite powder is packed in the mould, after colding pressing with the pressure of 10～60MPa, mould is put into 340～380 ℃ of insulations of baking oven 0.5～1 hour, take out the back in chilling press with the pressure pressurize of 10～30MPa 5～20 minutes, the demoulding.
Wherein thermoplastic polyimide is that the fundamental property of thermoplastic polyimide resin is: flexural strength 150～190MPa, and tensile strength 70～110MPa, second-order transition temperature is 〉=250 ℃, shock strength 20～50kJ/m
2, the GCPI that preferred Changzhou extensively becomes novel plastic company limited to produce
TMPowder, it not only has performances such as excellent heat resisting, mechanics, dielectric, corrosion resistant and radioprotective, also shows remarkable hot-work characteristic, can adopt hot moulding, extrude and the injecting method moulding.
Described fortifying fibre is a kind of of carbon fiber or glass fibre or both mixtures.
Described solid lubricant is a kind of of tetrafluoroethylene or molybdenumdisulphide or both mixtures.
Described sliding blade of air compressor made from thermoplastic polyimide group composite powder adopts the method preparation of mechanically mixing, and it has effectively reduced the introducing of solvent, has shortened the technological process of production, enhances productivity greatly.
Described sliding blade of air compressor made from thermoplastic polyimide group adopts and improves hot press method, before and after hot pressing, add the cold pressing treatment process earlier and carry out moulding, thereby reduced molding time, help large-scale continuous production, simultaneously can make the abundant compacting of material, reduce the existence of space and defective, improve the strength of materials effectively, material bending intensity can reach more than the 66MPa.
Beneficial effect:
The present invention is a binding agent with a kind of thermoplastic polyimide (TPI), fills solid lubricants such as fortifying fibre and graphite and forms; Adopt the method for mechanically mixing to prepare composite powder, it has effectively reduced the introducing of impurity, has shortened the technological process of production, enhances productivity greatly; Improve the hot compression molding mode, reduced the space and the defective that exist in the material, effectively improved the strength of materials, its product and data in literature comparative result are as follows:
| Performance index | This patent measured value | Literature value |
| Flexural strength/MPa | 66～90 | 50～88 |
| Density/gcm -3 | 1.80～1.90 | 1.76～2.15 |
| Trial run work pressure/MPa | 0.25 | 0.20 |
| Exhaust temperature/℃ | 190～198 | 240～255 |
| The part situation | 〉=1000 hours | 〉=2 hours |
Embodiment
Embodiment 1
A kind of sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof, comprise following processing step: in 10 kilograms of graphite, add 7 kilograms in thermoplastic polyimide powder, 2 kilograms on carbon fiber, 1 kilogram of 7～9 microns tetrafluoroethylene raises 50 and to mix 3-5 minute in the fast mixing machine.Compound is packed in the mould, after colding pressing with the pressure of 40MPa, mould is put into 380 ℃ of insulations of baking oven 1 hour, take out the back in chilling press with the pressure pressurize of 15MPa 15 minutes, the demoulding.Carry out precision work by the figure paper size at last and can obtain satisfactory slide plate.The slide plate density that makes is 1800kg/m
3, bending property is 81MPa, frictional coefficient 0.09-0.10, volume wear rate: 5.84 * 10
-15m
3/ (Nm).
Embodiment 2
A kind of sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof, comprise following processing step: in 10 kilograms of graphite, add 5 kilograms in thermoplastic polyimide powder, 0.83 kilogram in glass fibre, 0.83 kilogram of molybdenumdisulphide mixed 3-5 minute in the fast mixing machine of 50 risings.Compound is packed in the mould, after colding pressing with the pressure of 20MPa, mould is put into 360 ℃ of insulations of baking oven 0.5 hour, take out the back in chilling press with the pressure pressurize of 10MPa 20 minutes, the demoulding.Carry out precision work by the figure paper size at last and can obtain satisfactory slide plate.The slide plate density that makes is 1880kg/m
3, bending property is 68MPa, frictional coefficient 0.085-0.095, volume wear rate: 8.84 * 10
-15m
3/ (Nm).
Embodiment 3
A kind of sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof, comprise following processing step: in 10 kilograms of graphite, add 5.46 kilograms in thermoplastic polyimide powder, 0.9 kilogram on carbon fiber, 0.9 kilogram of molybdenumdisulphide, 0.9 kilogram of 7～9 microns tetrafluoroethylene raises 50 and to mix 3-5 minute in the fast mixing machine.Compound is packed in the mould, after colding pressing with the pressure of 60MPa, mould is put into 340 ℃ of insulations of baking oven 0.75 hour, take out the back in chilling press with the pressure pressurize of 30MPa 10 minutes, the demoulding.Carry out precision work by the figure paper size at last and can obtain satisfactory slide plate.The slide plate density that makes is 1820kg/m
3, bending property is 74MPa, frictional coefficient 0.09-0.10, volume wear rate: 1.4 * 10
-14m
3/ (Nm).
Embodiment 4
A kind of sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof comprises following processing step: add 5.38 kilograms in thermoplastic polyimide powder in 10 kilograms of graphite, mixed 3-5 minute in the fast mixing machine of 50 risings.Compound is packed in the mould, after colding pressing with the pressure of 30MPa, mould is put into 370 ℃ of insulations of baking oven 0.8 hour, take out the back in chilling press with the pressure pressurize of 12MPa 18 minutes, the demoulding.Carry out precision work by the figure paper size at last and can obtain satisfactory slide plate.The slide plate density that makes is 1900kg/m
3, bending property is 76MPa, frictional coefficient 0.10-0.12, volume wear rate: 1.6 * 10
-14m
3/ (Nm).
Embodiment 5
A kind of sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof comprises following processing step: in 17 kilograms of graphite, add 7 kilograms in thermoplastic polyimide powder, and 1 kilogram on carbon fiber, molybdenumdisulphide mixed 3-5 minute in the fast mixing machine of 50 risings for 1 kilogram.Compound is packed in the mould, after colding pressing with the pressure of 30MPa, mould is put into 370 ℃ of insulations of baking oven 0.8 hour, take out the back in chilling press with the pressure pressurize of 12MPa 18 minutes, the demoulding.Carry out precision work by the figure paper size at last and can obtain satisfactory slide plate.The slide plate density that makes is 1760kg/m
3, bending property is 72MPa, frictional coefficient 0.06-0.08, volume wear rate: 4.2 * 10
-15m
3/ (Nm).
Embodiment 6
A kind of sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof, comprise following processing step: in 10 kilograms of graphite, add 2.8 kilograms in thermoplastic polyimide powder, 0.4 kilogram on carbon fiber, 0.9 kilogram of 7～9 microns tetrafluoroethylene raises 50 and to mix 3-5 minute in the fast mixing machine.Compound is packed in the mould, after colding pressing with the pressure of 50MPa, mould is put into 370 ℃ of insulations of baking oven 0.8 hour, take out the back in chilling press with the pressure pressurize of 12MPa 18 minutes, the demoulding.Carry out precision work by the figure paper size at last and can obtain satisfactory slide plate.The slide plate density that makes is 1820kg/m
3, bending property is 78MPa, frictional coefficient 0.07-0.10, volume wear rate: 8.7 * 10
-15m
3/ (Nm).
Embodiment 7
A kind of sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof, comprise following processing step: in 5 kilograms of graphite, add 5 kilograms in thermoplastic polyimide powder, 1.25 kilograms on carbon fiber, 7～9 microns tetrafluoroethylene mixed 3-5 minute in the fast mixing machine of 50 risings for 1.25 kilograms.Compound is packed in the mould, after colding pressing with the pressure of 30MPa, mould is put into 370 ℃ of insulations of baking oven 0.8 hour, take out the back in chilling press with the pressure pressurize of 12MPa 18 minutes, the demoulding.Carry out precision work by the figure paper size at last and can obtain satisfactory slide plate.The slide plate density that makes is 1650kg/m
3, bending property is 69MPa, frictional coefficient 0.15-0.18, volume wear rate: 3.2 * 10
-14m
3/ (Nm).
With the slide plate SLT-80 compressor test run(s) of installing of packing into:
| Measured value | The test run parameter | |
| Exhaust temperature (℃) | 190-198 | ＜200 |
| Free air delivery (m 3/h) | 482-489 | ≥480 |
| Operating pressure (MPa) | 0.25 | ＜0.3 |
| Shaft power (kW) | 28-30 | ＜31 |
Part, free air delivery decline phenomenon do not take place in continuous operation 1000 hours, and sample is used the back check and analysis, can judge tentatively that be more than 12 months its work-ing life.
Claims (7)
1. sliding blade of air compressor made from thermoplastic polyimide group, the material that it is characterized in that this slide plate form and weight percentage as follows:
Graphite: 40～80%
Thermoplastic polyimide (TPI): 20%～40%
Fortifying fibre: 0%～10%
Solid lubricant: 0%～10%;
The fundamental property of wherein said thermoplastic polyimide resin is: flexural strength 150～190MPa, and tensile strength 70～110MPa, second-order transition temperature is 〉=250 ℃, shock strength 20～50kJ/m
2
2. sliding blade of air compressor made according to claim 1 is characterized in that described fortifying fibre is a kind of of carbon fiber or glass fibre or both mixtures.
3. sliding blade of air compressor made according to claim 1 is characterized in that described solid lubricant is a kind of of tetrafluoroethylene or molybdenumdisulphide or both mixtures.
4, a kind of method for preparing the described sliding blade of air compressor made from thermoplastic polyimide group of claim 1, it is characterized in that adopting the method for mechanically mixing to prepare composite powder, and adopt the improvement hot press method to carry out moulding: with the graphite of weight percentage 40～80%, 20%～40% thermoplastic polyimide (TPI), 0%～10% fortifying fibre and 0%～10% solid lubricant mechanically mixing, the blended composite powder is packed in the mould, after colding pressing with the pressure of 10～60MPa, mould is put into 340～380 ℃ of insulations of baking oven 0.5～1 hour, take out the back in chilling press with the pressure pressurize of 10～30MPa 5～20 minutes, the demoulding.
5. the preparation method of sliding blade of air compressor made according to claim 4, the fundamental property that it is characterized in that thermoplastic polyimide resin is: flexural strength 150～190MPa, tensile strength 70～110MPa, second-order transition temperature is 〉=250 ℃, shock strength 20～50kJ/m
2
6. the preparation method of sliding blade of air compressor made according to claim 4 is characterized in that described fortifying fibre is a kind of of carbon fiber or glass fibre or both mixtures.
7. the preparation method of sliding blade of air compressor made according to claim 4 is characterized in that described solid lubricant is a kind of of tetrafluoroethylene or molybdenumdisulphide or both mixtures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100401239A CN1328320C (en) | 2005-05-20 | 2005-05-20 | Sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100401239A CN1328320C (en) | 2005-05-20 | 2005-05-20 | Sliding blade of air compressor made from thermoplastic polyimide group and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1687236A CN1687236A (en) | 2005-10-26 |
| CN1328320C true CN1328320C (en) | 2007-07-25 |
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|---|---|---|---|
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5683571B2 (en) * | 2010-04-08 | 2015-03-11 | 大豊工業株式会社 | Graphite-added resin-based sliding material and sliding member |
| CN105062068A (en) * | 2015-03-26 | 2015-11-18 | 苏州市德莱尔建材科技有限公司 | Compressor valve plate PI material and preparation method thereof |
| CN105257541B (en) * | 2015-10-20 | 2018-12-07 | 芜湖环球汽车配件有限公司 | A kind of vacuum pump |
| CN106633865A (en) * | 2016-10-20 | 2017-05-10 | 兰州理工大学 | A polyimide-based valve disc material used for air compressors and a preparing method thereof |
| CN108192343A (en) * | 2017-12-26 | 2018-06-22 | 江苏君华特种工程塑料制品有限公司 | A kind of nonisulated thermosetting property PI materials and its moulding process |
| CN111334041B (en) * | 2020-03-26 | 2021-07-23 | 中国科学院兰州化学物理研究所 | Polyimide lubricating material filled with nano titanium nitride and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313361A (en) * | 2000-03-13 | 2001-09-19 | 中国科学院化学研究所 | Refractory antiwear polyimide as sealing material and its preparing process and application |
| WO2003010237A1 (en) * | 2001-07-26 | 2003-02-06 | Solvay Advanced Polymers, Llc | Improved polyamide-imide molding resins and methods for their preparation |
| CN1470625A (en) * | 2003-06-17 | 2004-01-28 | 燕山大学 | Expanded grahpite/molybdenum disulfide composite solid lubricating material and its preparing process |
| CN1487020A (en) * | 2003-07-17 | 2004-04-07 | 上海交通大学 | Composite aramid fiber/polyimide material and its prepn |
-
2005
- 2005-05-20 CN CNB2005100401239A patent/CN1328320C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313361A (en) * | 2000-03-13 | 2001-09-19 | 中国科学院化学研究所 | Refractory antiwear polyimide as sealing material and its preparing process and application |
| WO2003010237A1 (en) * | 2001-07-26 | 2003-02-06 | Solvay Advanced Polymers, Llc | Improved polyamide-imide molding resins and methods for their preparation |
| CN1470625A (en) * | 2003-06-17 | 2004-01-28 | 燕山大学 | Expanded grahpite/molybdenum disulfide composite solid lubricating material and its preparing process |
| CN1487020A (en) * | 2003-07-17 | 2004-04-07 | 上海交通大学 | Composite aramid fiber/polyimide material and its prepn |
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|---|---|
| CN1687236A (en) | 2005-10-26 |
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