CN105566905A - Method for reducing friction coefficient of polyetherimide by adding bi-component fillers - Google Patents
Method for reducing friction coefficient of polyetherimide by adding bi-component fillers Download PDFInfo
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- CN105566905A CN105566905A CN201610058638.XA CN201610058638A CN105566905A CN 105566905 A CN105566905 A CN 105566905A CN 201610058638 A CN201610058638 A CN 201610058638A CN 105566905 A CN105566905 A CN 105566905A
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- polyetherimide
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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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Abstract
The invention discloses a method for reducing the friction coefficient of polyetherimide by adding bi-component fillers, and belongs to the technical field of thermoplastic plastic. According to the method, the bi-component fillers teflon and graphite are added into a polyetherimide matrix, wherein in the mixture of teflon, graphite and the polyetherimide matrix, the mass percent of teflon is 5-25%, and the mass percent of graphite is 5-25%; teflon, graphite and the polyetherimide matrix are mixed with a high-speed stirrer till uniform distribution is achieved; the mixture is blended with a three-screw extruder after being dried, and a polyetherimide blend with the friction coefficient ranging from 0.18 to 0.31 is obtained. The method has the advantages that both teflon and graphite have a good lubricating effect, the proportion is optimized by adjusting the contents of the two fillers, the three-screw processing mode is adopted, when the mass percent of teflon is 15% and the mass percent of graphite is 10%, the friction coefficient of the polyetherimide blend is obviously reduced to 0.18 from 0.30 obtained when only graphite is added, and unexpected technical effects not recorded in the prior art are achieved.
Description
Technical field
The invention belongs to thermoplastics technical field, being specifically related to a kind of method reducing polyetherimide frictional coefficient by dosing two-pack filler.
Background technology
Polyetherimide, as an analog thermoplastic polyimide, has the processibility of outstanding thermotolerance, mechanical property, electrical insulating property, chemical stability and excellence, is subject to extensive concern at aerospace, automobile and mechanical field.But the rubbing factor of polyetherimide self is very high, and wear resistance is very poor, therefore directly cannot be used for being made into friction product and use, these greatly limit the application of polyetherimide, usually need to add lubricant to it and carry out modification.
In recent years, in order to improve the wear resistance of polyetherimide, the solid lubricants such as molybdenumdisulphide, aluminium sesquioxide, graphite, tetrafluoroethylene are widely used, and the extrusion moulding of many employing twin screw blending methods.Wang Li admires to wait and proposes in the 10th phase in 2007 " graphite-filled polyetherimide tribological property is analyzed " in " lubrication and sealing ", and the interpolation of graphite makes the frictional coefficient of polyetherimide decline, but is only low to moderate 0.3.Cheng Xianhua etc. are disclose a kind of nanometer Al in the Chinese patent of 200510027062.2 at application number
2o
3the preparation method of/polyimide friction compound material sliding surface bearing, but method is complicated, is unfavorable for a large amount of production.
Jiang Nan etc. propose in " plastics " first phase in 2003 " three-screw extruder and characteristic thereof ", and three-screw extruder is the another new intention in extrusion machinery field, has outstanding distributed rendering ability.Compared to twin screw extruder, it in raising output, improve quality product and increase in technical economic benefit there is obvious competitive edge.Three-screw extruder is well applied in the preparation of functional plastics, high brightness coating and food processing field, but the research in anti-attrition modification is little.
Along with developing rapidly of modern science and technology, in research in the past, the solid lubricant of one-component can not meet people's requirement more and more higher to material to the improvement of frictional behaviour, multiple oil pad modified polyetherimide frictional behaviour aspect or blank.Meanwhile, be different from twin screw processing mode in the past, the application of three screw rods will improve the performance of blend polyetherimides further.
Summary of the invention
The object of the invention is the problem limiting its widespread use for polyetherimide frictional behaviour difference, provide a kind of formula of two-pack oil pad, and adopt three screw rod processing modes, friction materials preparation method is simple, can produce in a large number.
The technical solution used in the present invention is: two-pack filler tetrafluoroethylene and graphite are dosed in polyetherimide matrix, in the mixture of three, mass percent shared by tetrafluoroethylene is 5 ~ 25%, mass percent shared by graphite is 5 ~ 25%, homogenizer is utilized to mix until be uniformly distributed, blended by three-screw extruder after dry, obtain the blend polyetherimides that range of friction coefficients is 0.18 ~ 0.31.
Two-pack filler tetrafluoroethylene and graphite, and polyetherimide matrix is before combination respectively at 110 ~ 150 DEG C dry 3 ~ 10 hours.
Described three-screw extruder length-to-diameter ratio is 35, and processing temperature is 330 ~ 380 DEG C, and screw speed is 50 ~ 80r/min.
The invention has the beneficial effects as follows: tetrafluoroethylene and graphite all have good lubrication, by adjusting the content of two kinds of fillers, optimized proportion, adopt the processing mode of three screw rods, when the mass percent shared by tetrafluoroethylene is 15%, when the mass percent shared by graphite is 10%, the frictional coefficient of blend polyetherimides is reduced to 0.18 by 0.30 when dosing separately graphite, decline obviously, achieve in prior art and do not record and unexpected technique effect.
Embodiment
Embodiment 1: take 30g tetrafluoroethylene respectively, 30g graphite, 540g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 335 DEG C, and screw speed is 50r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.23.
Embodiment 2: take 30g tetrafluoroethylene respectively, 60g graphite, 510g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 330 DEG C, and screw speed is 65r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.30.
Embodiment 3: take 60g tetrafluoroethylene respectively, 30g graphite, 510g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 340 DEG C, and screw speed is 70r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.23.
Embodiment 4: take 30g tetrafluoroethylene respectively, 90g graphite, 480g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 345 DEG C, and screw speed is 70r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.25.
Embodiment 5: take 60g tetrafluoroethylene respectively, 60g graphite, 480g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 350 DEG C, and screw speed is 70r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.24.
Embodiment 6: take 90g tetrafluoroethylene respectively, 30g graphite, 480g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 370 DEG C, and screw speed is 65r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.28.
Embodiment 7: take 30g tetrafluoroethylene respectively, 120g graphite, 450g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 340 DEG C, and screw speed is 50r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.30.
Embodiment 8: take 60g tetrafluoroethylene respectively, 90g graphite, 450g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 360 DEG C, and screw speed is 65r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.26.
Embodiment 9: take 90g tetrafluoroethylene respectively, 60g graphite, 450g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 370 DEG C, and screw speed is 65r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.18.
Embodiment 10: take 120g tetrafluoroethylene respectively, 30g graphite, 450g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 375 DEG C, and screw speed is 75r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.22.
Embodiment 11: take 30g tetrafluoroethylene respectively, 150g graphite, 420g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 345 DEG C, and screw speed is 55r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.31.
Embodiment 12: take 60g tetrafluoroethylene respectively, 120g graphite, 420g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 350 DEG C, and screw speed is 65r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.29.
Embodiment 13: take 90g tetrafluoroethylene respectively, 90g graphite, 420g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 370 DEG C, and screw speed is 80r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.26.
Embodiment 14: take 120g tetrafluoroethylene respectively, 60g graphite, 420g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 380 DEG C, and screw speed is 75r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.25.
Embodiment 15: take 150g tetrafluoroethylene respectively, 30g graphite, 420g polyetherimide, is placed in baking oven, drying 5 hours at 120 DEG C.Dried three kinds of samples are put into homogenizer, mixes 2 hours until evenly.The 600g blend mixed is blended in three-screw extruder, and length-to-diameter ratio is 35, and temperature is 380 DEG C, and screw speed is 80r/min, and the blend obtained is according to ASTMG99-04 standard testing, and the frictional coefficient of this friction materials is 0.30.
Claims (3)
1. one kind is reduced the method for polyetherimide frictional coefficient by dosing two-pack filler, it is characterized in that: be that two-pack filler tetrafluoroethylene and graphite are dosed in polyetherimide matrix, in the mixture of three, mass percent shared by tetrafluoroethylene is 5 ~ 25%, mass percent shared by graphite is 5 ~ 25%, homogenizer is utilized to mix until be uniformly distributed, blended by three-screw extruder after dry, obtain the blend polyetherimides that range of friction coefficients is 0.18 ~ 0.31.
2. a kind of method reducing polyetherimide frictional coefficient by dosing two-pack filler as claimed in claim 1, it is characterized in that: two-pack filler tetrafluoroethylene and graphite, and polyetherimide matrix is before combination respectively at 110 ~ 150 DEG C dry 3 ~ 10 hours.
3. a kind of method reducing polyetherimide frictional coefficient by dosing two-pack filler as claimed in claim 1, it is characterized in that: described three-screw extruder length-to-diameter ratio is 35, processing temperature is 330 ~ 380 DEG C, and screw speed is 50 ~ 80r/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610058638.XA CN105566905A (en) | 2016-01-28 | 2016-01-28 | Method for reducing friction coefficient of polyetherimide by adding bi-component fillers |
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| CN201610058638.XA CN105566905A (en) | 2016-01-28 | 2016-01-28 | Method for reducing friction coefficient of polyetherimide by adding bi-component fillers |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1186827A (en) * | 1996-12-24 | 1998-07-08 | 中国科学院兰州化学物理研究所 | Polyimide self lubricating composite material |
| 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 |
| US20040198891A1 (en) * | 2001-07-26 | 2004-10-07 | Geoffrey Underwood | Polyamide-imide molding resins and methods for their preparation |
| CN1676548A (en) * | 2004-04-01 | 2005-10-05 | 中国科学院化学研究所 | Short-fiber reinforced polyimide composite material, and its preparing method and use |
| CN101092988A (en) * | 2007-07-09 | 2007-12-26 | 南京工业大学 | Thermoplastic polymer based thrust washer and method of making same |
-
2016
- 2016-01-28 CN CN201610058638.XA patent/CN105566905A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1186827A (en) * | 1996-12-24 | 1998-07-08 | 中国科学院兰州化学物理研究所 | Polyimide self lubricating composite material |
| 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 |
| US20040198891A1 (en) * | 2001-07-26 | 2004-10-07 | Geoffrey Underwood | Polyamide-imide molding resins and methods for their preparation |
| CN1676548A (en) * | 2004-04-01 | 2005-10-05 | 中国科学院化学研究所 | Short-fiber reinforced polyimide composite material, and its preparing method and use |
| CN101092988A (en) * | 2007-07-09 | 2007-12-26 | 南京工业大学 | Thermoplastic polymer based thrust washer and method of making same |
Non-Patent Citations (1)
| Title |
|---|
| 黄丽等: ""聚酰亚胺复合材料的性能研究"", 《北京化工大学学报》 * |
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Application publication date: 20160511 |