CN105838003A - Polytetrafluoroethylene automobile shock absorber piston film and preparation method thereof - Google Patents
Polytetrafluoroethylene automobile shock absorber piston film and preparation method thereof Download PDFInfo
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- CN105838003A CN105838003A CN201510656752.8A CN201510656752A CN105838003A CN 105838003 A CN105838003 A CN 105838003A CN 201510656752 A CN201510656752 A CN 201510656752A CN 105838003 A CN105838003 A CN 105838003A
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Abstract
The invention discloses a polytetrafluoroethylene automobile shock absorber piston film and a preparation method thereof. The polytetrafluoroethylene film comprises the following components by mass: 100 parts of polytetrafluoroethylene, 12-18 parts of 663 bronze powder, 2-8 parts of molybdenum disulfide, and 3-8 parts of flaky graphite. Specifically, the preparation method consists of: (1) using an organic solvent accounting for 0.5%-5% of the mass fraction of bronze powder; (2) mixing the raw materials in an air flow mixer evenly; (3) performing cold press molding on the mixture; (4) sintering a pressed blank in a sintering furnace under vacuum or nitrogen atmosphere at a temperature higher than 330DEG C; and (5) conducting subsequent machining so as to obtain the needed film. The polytetrafluoroethylene piston film prepared by the method provided by the invention has the advantages of good friction performance, high hardness and strength, excellent thermal stability, and difficult bonding.
Description
Technical field
The invention belongs to vehicle shock absorber accessory field, a kind of method designing piston packing and preparation thereof, especially a kind of teflon piston film and preparation method thereof.
Background technology
PTFE has solvent resistance and low cohesion energy density；Carbon-fluorine bond bond energy is high simultaneously, make it have preferable heat stability and chemical inertness, all strong acid, highly basic, strong oxidizer, reducing agent and the effect of various organic solvent in addition to molten alkali metal, element fluorine and strong fluorinated dielectric and the sodium hydroxide higher than 300 DEG C can be born.Additionally the intermolecular captivation of PTFE and surface can be relatively low, and almost all of solid material all can not stick to its surface, so that preferable ductility when PTFE has tribological property and the low temperature of excellence, coefficient of friction is the least, typically at 0.04-0.1.
The coefficient of friction that politef is minimum, minimum surface energy, there is special status in fretting wear field.Its particular use includes for chemical industry equipment, papermaking equipment, the bearing of agricultural machinery, as piston ring, machine tool guideway, guide ring；It is widely used as the supporting slide block of bridge, tunnel, steel roof truss, large-size chemical pipeline, storage tank in civil construction project, and turns as bridge pad and bridge formation.But there is also some defects, as poor in mechanical strength, linear expansion coefficient is relatively big, creep resistant is poor, particularly abrasion resistance difference and surface can low, poor radiation etc., these defects limit extensively applying of it to a certain extent.By the filling-modified wearability that can improve politef and mechanical strength etc..Traditional filler composition comprises carbon fiber, glass fibre, aluminium sesquioxide etc., but the interpolation of these fillers increases the coefficient of friction of ptfe composite, after corresponding composite is applied on automobile shock absorber piston film, in use can make piston that bigger frictionally damage occurs, reduce the service life of piston.
Summary of the invention
One of technical problem that present invention mainly solves is to provide the synthetic prescription of the politef damper piston film of a kind of modification.
The two of the technical problem to be solved are to provide the preparation technology of the politef damper piston film of a kind of modification.
The polytetrafluoroethylmaterial material made according to this formula, this technique has higher intensity, lubricity, life-span and wearability and relatively low coefficient of friction.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of teflon piston film, is made up of by mass parts following component: politef 100 parts, 663 bronze powder 12-18 parts, molybdenum bisuphide 2-8 part, flaky graphite 3-8 part.
The concrete preparation method of the teflon piston film belonging to the present invention is:
(1) 663 bronze powder is modified processing: bronze powder and organic solvent being added in ethanol, make ethanol liquid level not have bronze powder, organic solvent is the 0.5%-5% of bronze powder mass fraction.Carrying out after uniform stirring being placed in drying baker being dried process, make solvent ethanol volatilize, baking temperature is 30-60 DEG C.663 bronze powders are modified through organic solvent, contribute to strengthening the binding ability with matrix politef, and then improve mechanical property and the frictional behaviour of composite.
(2) batch mixing: add to meeting the polytetrafluorethylepowder powder of quality ratio requirement, modified 663 bronze powders, molybdenum bisuphide and flaky graphite in air-flow batch mixer, the most uniformly mix.
(3) compacting: mixture cold is molded.
(4) sintering: realize the real and existing densification of the melted adhesion of polytetrafluorethylepowder powder.
(5) carry out subsequent mechanical processing and carry out performance test.
The concrete preparation method of politef automobile shock absorber piston film as claimed in claim 2, it is characterised in that step step (4) sintering condition is vacuum-sintering or nitrogen atmosphere sintering, and sintering temperature is higher than 330 DEG C.
Described organic solvent is stearic acid.
The invention has the beneficial effects as follows: the polytetrafluoroethylmaterial material made according to inventive formulation has higher intensity, lubricity, life-span and wearability and relatively low coefficient of friction.
The present invention mainly selects 663 bronze powders, molybdenum bisuphide and flaky graphite as filler.Add copper powder and can improve the hardness of PTFE composite, bearing capacity and wear resistance；Molybdenum bisuphide has layer structure, it is possible to significantly reduce the coefficient of friction of product；Adding graphite and improve hardness and the shear strength of PTFE, can improve the physical mechanics property of polytetrafluoroethylproducts products, the lubrication of graphite hinders the carrying out of abrasion simultaneously, improves its wearability.The teflon piston film of the present invention, have higher intensity, lubricity and wearability and.Automobile shock absorber piston uses this film, frictional force can be lowered, extend film and the service life of piston, there is good application prospect.
Detailed description of the invention
By embodiment, technical scheme is described.
Embodiment 1
(2)
Weighing: component is consisted of by mass parts, politef 100 parts, 663 bronze powders 15 parts, molybdenum bisuphide 4 parts, flaky graphite 5 parts.
(3) 663 bronze powders are modified processing: bronze powder and organic solvent being added in ethanol, make ethanol liquid level not have bronze powder, organic solvent is the 1% of bronze powder mass fraction.Carrying out after uniform stirring being placed in drying baker being dried process, make solvent ethanol volatilize, baking temperature is 40 DEG C.
(4)
Batch mixing: each raw material is mixed in air-flow batch mixer；
(5)
Compacting: mixture cold is molded；
(6)
Sintering: vacuum condition sintering temperature is higher than 330 DEG C；
(7)
Carry out subsequent mechanical processing and carry out performance test.
Described organic solvent is stearic acid.
Test result is:
Shore hardness: 58HS
Hot strength: 24.4MPa
Elongation at break: 235%
Coefficient of friction: 0.134
Wear extent: 18mg(rotating speed 200r/min, loads 20KG load, with sample block to grinding 2 hours)
Embodiment 2
(8)
Weighing: component is consisted of by mass parts, politef 100 parts, 663 bronze powders 17 parts, molybdenum bisuphide 7 parts, flaky graphite 7 parts.
(9) 663 bronze powders are modified processing: bronze powder and organic solvent being added in ethanol, make ethanol liquid level not have bronze powder, organic solvent is the 3% of bronze powder mass fraction.Carrying out after uniform stirring being placed in drying baker being dried process, make solvent ethanol volatilize, baking temperature is 50 DEG C.
(10)
Batch mixing: each raw material is mixed in air-flow batch mixer；
(11)
Compacting: mixture cold is molded；
(12)
Sintering: nitrogen atmosphere sinters, sintering temperature is higher than 330 DEG C；
(13)
Carry out subsequent mechanical processing and carry out performance test.
Described organic solvent is stearic acid.
Test result is:
Shore hardness: 61HS
Hot strength: 26.6MPa
Elongation at break: 245%
Coefficient of friction: 0.143
Wear extent: 13mg(rotating speed 200r/min, loads 20KG load, with sample block to grinding 2 hours)
Embodiments described above is only a part of embodiment of the present invention.Based on the embodiment in the present invention, all other embodiments that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Claims (4)
1. a politef automobile shock absorber piston film, it is characterised in that component is consisted of by mass parts: politef 100 parts, 663 bronze powder 12-18 parts, molybdenum bisuphide 2-8 part, flaky graphite 3-8 part.
2. the preparation method of a politef automobile shock absorber piston film, it is characterised in that follow the steps below:
663 bronze powders are modified processing: add in ethanol by bronze powder and organic solvent, ethanol liquid level is made not have bronze powder, organic solvent is the 0.5%-5% of bronze powder mass fraction, carry out after uniform stirring being placed in drying baker being dried process, making solvent ethanol volatilize, baking temperature is 30-60 DEG C；
Batch mixing: add to meeting the polytetrafluorethylepowder powder of quality ratio requirement, modified 663 bronze powders, molybdenum bisuphide and flaky graphite in air-flow batch mixer, the most uniformly mix；
Compacting: mixture cold is molded；
Sintering: realize the melted adhesion of polytetrafluorethylepowder powder and densification；
Carry out subsequent mechanical machine-shaping.
The preparation method of politef automobile shock absorber piston film the most according to claim 2, it is characterised in that step (4) sintering condition is vacuum-sintering or nitrogen atmosphere sintering, and sintering temperature is higher than 330 DEG C.
The preparation method of politef automobile shock absorber piston film the most according to claim 2, it is characterised in that described organic solvent is stearic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510656752.8A CN105838003A (en) | 2015-10-12 | 2015-10-12 | Polytetrafluoroethylene automobile shock absorber piston film and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510656752.8A CN105838003A (en) | 2015-10-12 | 2015-10-12 | Polytetrafluoroethylene automobile shock absorber piston film and preparation method thereof |
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| CN105838003A true CN105838003A (en) | 2016-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510656752.8A Pending CN105838003A (en) | 2015-10-12 | 2015-10-12 | Polytetrafluoroethylene automobile shock absorber piston film and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109337265A (en) * | 2018-10-29 | 2019-02-15 | 扬州立德粉末冶金股份有限公司 | A kind of automobile shock absorber piston film and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103319822A (en) * | 2012-03-21 | 2013-09-25 | 上海盈致橡塑制品有限公司 | Polytetrafluoroethylene piston sealing ring |
-
2015
- 2015-10-12 CN CN201510656752.8A patent/CN105838003A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103319822A (en) * | 2012-03-21 | 2013-09-25 | 上海盈致橡塑制品有限公司 | Polytetrafluoroethylene piston sealing ring |
Non-Patent Citations (2)
| Title |
|---|
| 王文广等主编: "《塑料配方设计 第二版》", 31 July 2004 * |
| 陈海涛等编著: "《塑料制品加工实用新技术》", 31 May 2010 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109337265A (en) * | 2018-10-29 | 2019-02-15 | 扬州立德粉末冶金股份有限公司 | A kind of automobile shock absorber piston film and preparation method thereof |
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Application publication date: 20160810 |