CN104559924A - Thermoplastic resin friction material and preparation method thereof - Google Patents
Thermoplastic resin friction material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a thermoplastic resin friction material and a preparation method thereof, which mainly overcome the defects of long processing cycle and low unnotched impact strength existing in the adoption of a scheme of taking thermoplastic resin as matrix resin and adding carbon fiber, steel fiber, filler, a curing agent and the like in the prior art. Through the adoption of a technical scheme that the thermoplastic resin friction material disclosed by the invention comprises the following components in parts by weight: (A) 45-70 parts of nylon 66 resin, (B) 1-20 parts of metal copper powder, (C) 5-15 parts of polytetrafluoroethylene (PTFE) resin, (D) 10-40 parts of carbon fiber and (E) 0.01-5 parts of additives, the technical problem is solved well, and therefore, and the preparation method disclosed by the invention can be used in the industrial production of thermoplastic resin friction materials.
Description
Technical field
The present invention relates to thermoplastic resin friction materials and preparation method thereof.
Background technology
In recent years because carbon fiber output increases the development of price reduction and processing technology, the application of fibre reinforced thermoplas tic resin composite is more and more wider, as US Patent No. 6,231,788 disclose a kind of carbon-fibre composite with electromagnetic wave shielding be made up of PC-ABS resin complexes and carbon fiber, can be used for dust guard pollution abatement equipment and notebook computer casing; Chinese patent CN101139462 discloses a kind of fire-retardant carbon-fibre composite be made up of polyamide resin, carbon fiber, red phosphorus combustion inhibitor, toughner etc.; Chinese patent CN1165523 discloses a kind of carbon-fibre composite by the excellent in abrasion resistance of milled carbon fiber, polyolefin resin (PP) (or polyamide resin or polyether-ether-ketone resin) and polytetrafluoroethylene (PTFE) powder constituent, can be used as the gripping clamping apparatus in some process operation process of semi-conductor.
Wear-resisting carbon-fibre composite is the important carbon-fibre composite of a class, has been widely used.The wear-resisting carbon-fibre composite general requirement that substituted metal material does the element parts such as gear, bearing, pulley, mechanical pump rotor has lower frictional coefficient, can reduce power consumption like this, increase the service life.The wear-resisting carbon-fibre composite (also known as friction materials) being used as the brake components such as brake facing requires to have medium sized frictional coefficient (being generally 0.30 ~ 0.70), because the material that frictional coefficient is too high can be larger to the wearing and tearing of mating plate, can reduce the work-ing life of mating plate, and the too little braking effect of frictional coefficient is poor.Brake pad material in the past generally adopts thermosetting resin to add fortifying fibre and the compositions such as lubricant, abrasive such as carbon fiber, steel fiber, glass fibre.Be matrix resin as Chinese patent CN103059504 discloses a kind of with Effect of Organosilicon-modified Phenol-formaldehyde Resin, steel fiber, carbon fiber, aramid fiber, glass fibre two or more make fortifying fibre, add filler, toughner, solidifying agent etc. through solidification preparation wear resistant automobile braking composite material.It is long to there is the process-cycle in this thermosetting resin based composites, the shortcoming that resistance to impact shock is low.
Summary of the invention
One of technical problem to be solved by this invention be prior art adopt thermosetting resin be matrix resin add carbon fiber, steel fiber, filler, solidifying agent etc. scheme exist process-cycle long, the shortcoming that non-notch resistance to impact shock is low, there is provided a kind of thermoplastic resin friction materials, this thermoplastic resin friction materials has the advantages such as non-notch resistance to impact shock is high.
Two of technical problem to be solved by this invention is preparation methods of the thermoplastic resin friction materials corresponding to one of above-mentioned technical problem.
In order to one of solve the problems of the technologies described above, technical scheme of the present invention is as follows: thermoplastic resin friction materials, comprises following component with weight parts:
A.45 ~ 70 parts of Nylon 66s;
B.1 ~ 20 parts of copper powders;
C.5 ~ 15 parts of polytetrafluoroethylene (PTFE) resins;
D.10 ~ 40 parts of carbon fibers;
E.0.01 ~ 5 parts of auxiliary agents.
In technique scheme, the relative viscosity of described Nylon 66 is preferably 2.4 ~ 3.2.
In technique scheme, the particle diameter of described copper powder represents with order number and is preferably greater than 100 orders; Or described copper powder is preferably by >0 and the sieve aperture of < 150 microns.
In technique scheme, the particle diameter of described teflon resin is preferably 2 ~ 20 microns.
In technique scheme, described carbon fiber preferably adopts continuous fiber.
In technique scheme, described carbon fiber is preferably 15 ~ 40 parts with weight parts consumption.
In technique scheme, described auxiliary agent is at least one in oxidation inhibitor or compatilizer.
In technique scheme, described auxiliary agent is 0.1 ~ 2 part with weight parts consumption.
In technique scheme, described 66 resins are preferably 50 ~ 65 parts with weight parts consumption.
In technique scheme, described copper powder is preferably 2 ~ 15 parts with weight parts consumption.
In technique scheme, described teflon resin is preferably 5 ~ 15 parts with weight parts consumption.
As the present invention's most preferred technical scheme thermoplastic resin friction materials, comprise following component with weight parts:
Nylon 66 56 ~ 65 parts,
Copper powder 5 ~ 15 parts,
Polytetrafluoroethylene (PTFE) resin 5 ~ 10 parts,
25 ~ 30 parts, carbon fiber,
Auxiliary agent 0.1 ~ 2 part.
In technique scheme, in order to flexural strength, the modulus in flexure of described thermoplastic material outstanding when improving Izod unnotched impact strength, one of preferred preferred plan is further: described thermoplastic resin friction materials, comprises following component with weight parts:
Nylon 66 56.5 ~ 58.5 parts,
Copper powder 6.5 ~ 8.5 parts,
Polytetrafluoroethylene (PTFE) resin 6.5 ~ 8.5 parts,
26.5 ~ 28.5 parts, carbon fiber,
Auxiliary agent 0.1 ~ 2 part.
In technique scheme, in order to the Rockwell hardness of described thermoplastic material outstanding when improving Izod unnotched impact strength, two of preferred preferred plan are further: described thermoplastic resin friction materials, comprises following component with weight parts:
Nylon 66 48.5 ~ 50.5 parts,
Copper powder 13.5 ~ 15.5 parts,
Polytetrafluoroethylene (PTFE) resin 6.5 ~ 8.5 parts,
27.5 ~ 29.5 parts, carbon fiber,
Auxiliary agent 0.1 ~ 2 part.
In technique scheme, in order to the Izod notched Izod impact strength of described thermoplastic material outstanding when improving Izod unnotched impact strength, three of preferred preferred plan are further: described thermoplastic resin friction materials, comprises following component with weight parts:
Nylon 66 59.5 ~ 61.5 parts,
Copper powder 6.5 ~ 8.5 parts,
Polytetrafluoroethylene (PTFE) resin 6.5 ~ 8.5 parts,
23.5 ~ 25.5 parts, carbon fiber,
Auxiliary agent 0.1 ~ 2 part.
In technique scheme, in order to the tensile strength of described thermoplastic material outstanding when improving Izod unnotched impact strength, four of preferred preferred plan are further: described thermoplastic resin friction materials, comprises following component with weight parts:
Nylon 66 52.5 ~ 54.5 parts,
Copper powder 6.5 ~ 8.5 parts,
Polytetrafluoroethylene (PTFE) resin 6.5 ~ 8.5 parts,
30.5 ~ 32.5 parts, carbon fiber,
Auxiliary agent 0.1 ~ 2 part.
In order to solve the problems of the technologies described above two, technical scheme of the present invention is as follows: the preparation method of thermoplastic resin friction materials described in the described technical scheme of one of above-mentioned technical problem, comprises following process:
I) Nylon 66 is 80 ~ 100 DEG C of vacuum-dryings 8 ~ 12 hours;
II) Nylon 66, copper powder, teflon resin and described auxiliary agent add in twin screw extruder by weight proportion and mix, and twin-screw extruder barrel temperature is 250 ~ 300 DEG C;
III) continuous length carbon fiber is from twin screw extruder intermediate openings introducing resin system, and carbon fiber is sheared fragmentation in twin screw extruder, extrudes together with resin, and then pelletizing obtains described thermoplastic resin friction materials.
In order to absolutely prove the feature of thermoplastic resin friction materials of the present invention, more specifically introducing the preferred method for making of each preferred ingredient below by way of example, optimization technique requires and preferred compositing range.
Component A: component A is Nylon 66, it is the polycondensate (poly-(hexamethylene adipamide) of hexanodioic acid and hexanediamine, PA66), the mol ratio of hexanodioic acid and hexanediamine is generally 1:1 in the course of the polymerization process, the molecular weight of polymkeric substance is by adding a small amount of acetic acid or hexanodioic acid regulates, also by the incompatible adjustment of the solid polycondensation after pelletizing, concrete production process can with reference to Chemical Industry Press (calendar year 2001) " engineering plastics " P43-65.The Nylon 66 that the present invention uses is poly-(hexamethylene adipamide) that can be used as the use of engineering plastics plastics, with intermediate molecular weight or high molecular as well, being less than 3.2 as well by the relative viscosity of sulfuric acid test to be greater than 2.4, high molecular PA66 also can being taked to add the mode of a small amount of lower molecular weight PA66 in order to regulate the processing fluidity of composition.Nylon 66 content in the compositions of the present invention counts 45 ~ 70 parts with parts by weight, preferably 50 ~ 65 parts.
B component: B component is copper powder, industrial copper powder is produced by electrolytic process or additive method.The copper powder particle size that the present invention uses is greater than 100 orders, and be greater than 200 orders better, purity is greater than 99%, is greater than 99.5% better.Copper powder appropriately can improve frictional coefficient and the hardness of the present composition, thus improves wear resistance; Copper powder also can take away as a kind of good conductor of heat a large amount of heat energy that friction materials produces due to rubbing effect, thus improves the work-ing life of friction materials.The consumption of copper powder counts 1 ~ 20 part with parts by weight in the compositions of the present invention, preferably 2 ~ 15 parts.
Component C: component C is a kind of polytetrafluoroethylene (PTFE) powdex, and in the compositions of the present invention mainly for appropriateness reduces the frictional coefficient of material, lubricate, can extend the work-ing life of friction materials.Another reason that the present composition selects PTFE to make antifriction auxiliary agent is PTFE is that a kind of polymkeric substance is less on impacts such as the shock strengths of matrix material.This PTFE resin can be produced with suspension polymerization, has lower molecular weight, and powder diameter is at 1-20 micron, better with 2-10 micron.PTFE resin content in the compositions of the present invention counts 5 ~ 15 parts with parts by weight, preferably 5 ~ 10 parts.
Component D: component D is a kind of continuous carbon fibre, by being distributed in matrix material after the specific technique fragmentation of the present invention.This carbon fiber can pass through the operational paths such as polyacrylonitrile (PAN) spinning, drawing-off, oxidation, carbonization and produce (PAN base carbon fibre), also can produce (asphalt base carbon fiber) with special bituminous resins through operational paths such as spinning, oxidation, carbonizations.Carbon fiber is generally divided into different grades according to tensile strength and tensile modulus, there are standard modulus type carbon fiber (as T300, AS4, T700 etc.), middle model carbon fiber (as IM6, IM7 etc.), high model carbon fiber (as M55J, M60J, M65J etc.), the present invention mainly reduces the fragmentation of carbon fiber thus the performance of raising matrix material by specific technique, therefore has no particular limits carbon fiber grade.The carbon content of carbon fiber is very high, generally be greater than 90%, so its surface energy is lower, with other material in conjunction with poor, in order to improve this deficiency, the carbon fiber surface of business is generally coated with through special process (as anodic oxidation, strong acid corrosion etc.) resin (as epoxy resin etc.) that a small amount of (0.5% ~ 3% scope in) improves cementability, and this is favourable often to improving composite property.Carbon fiber content in the compositions of the present invention counts 10 ~ 40 parts with parts by weight, preferably 25 ~ 30 parts.
Component E: component E is some auxiliary agents added to improve the impacts that contingent performance reduces in high temperature working processes such as Nylon 66, as prevented the oxidation inhibitor of Nylon 66 oxidative degradation, it also may be the compatilizer improving Nylon 66 and carbon fiber associativity.Oxidation inhibitor can be all kinds of hindered phenolic antioxidant (as Irganox1076, Irganox1010 etc.), phosphite ester kind antioxidant (as Irgafos 168,626,852 etc.) or their mixture (as Irganox B215, B225 etc.).Compatilizer has styrene-maleic anhydride copolymer, ethylene-acrylate copolymer, epoxy resin etc.Component E content in the compositions of the present invention counts 0.01 ~ 5 part with parts by weight, preferably 0.1 ~ 2 part.
The preparation method of carbon fiber reinforced nylon 66 friction materials of the present invention is different from traditional use and mills the method for carbon fiber.Traditional carbon fiber of milling destroys serious to fibrous texture, many carbon fibers are ground into Powdered, thus weaken the reinforced effects of engineering plastics; In addition, carbon fiber of milling is general all without good surface treatment, therefore neither be fine with the bonding force of engineering plastics.The present invention uses the fine surface-treated continuous carbon fibre of the obtainable process of business, in the course of processing, reduced the structure deteriorate of carbon fiber by adjustment screw rod block combiner as far as possible, thus obtain the good described thermoplastic resin friction materialss of mechanical property such as tensile strength, flexural strength and modulus.
The raw material adopted in the specific embodiment of the invention and drying conditions as follows:
Nylon 66: EPR27, intrinsic viscosity 2.67, Henan Shen Ma engineering plastics company limited, 90 DEG C of vacuum-dryings 8 hours before using;
Copper powder-1: granularity 200 order, purity is greater than 99%, the good powder body material company limited in Shanghai nine;
Copper powder-2: granularity is greater than 10000 orders, and purity is greater than 99.5%, Suzhou Chang Hu nanosecond science and technology company limited;
Teflon resin, particle diameter 2-6 micron, Daikin industrial;
Antioxidant 1010, Shanghai vapour Bagao bridge Chemical Co., Ltd..
Carbon fiber (CF): toray industrial.
Material properties test:
Resin and carbon fiber content analysis: wearing composite material sample formic acid dissolves, then filter with glass sand hourglass, washing, drying can obtain solvend mass percentage and insoluble material amount percentage composition, solvend mass percentage is nylon resin content, and insoluble material is the mixture of teflon resin and copper powder, carbon fiber; (teflon resin+copper powder) content can calculate according to the feed ratio of nylon resin/(teflon resin and copper powder); Carbon fiber content is that insolubles mass percentage deducts (teflon resin+copper powder) content and obtains.
Tensile strength: by ASTM D638 standard testing, rate of extension 50mm/min.
Flexural strength and modulus in flexure: by ASTM D790 standard testing, speed 1.3mm/min.
Izod notched Izod impact strength: by ASTM D256 standard testing, the thick sample of 3.2mm, uses 1J pendulum.
Izod unnotched impact strength: by ASTM D256 standard testing, uses 5.5J pendulum.
Heat-drawn wire: by ASTM D648 standard testing, 1.82MPa load, specimen size 127x12.7x6.4mm.
Frictional coefficient: by GB3960-1983 standard testing, applies 20 kilogram forces, 45
#steel is to bull ring.
Wearing and tearing: by GB3960-1983 standard testing, apply 20 kilogram forces, 45
#steel to bull ring, time 2 h.
After adopting technical scheme of the present invention, thermoplastic resin friction materials described in carbon of the present invention can adopt Shooting Technique shaping, shaping cycle is short, Izod unnotched impact strength is up to 1162J/m, frictional coefficient is between 0.35 ~ 0.50, wearing and tearing are at 3 ~ 6mg, and achieving good technique effect, is a kind of novel friction materials.
Embodiment
[embodiment 1]
Twin screw extruder (German LEISTRITZ company, MICRO 27 type) barrel temperature is set as 250 DEG C, 260 DEG C, 270 DEG C, 280 DEG C, 285 DEG C, 290 DEG C, 290 DEG C DEG C, 290 DEG C, 290 DEG C, 285 DEG C respectively from charging opening to mouth mould, in pellet weight loss feeders, load dry Nylon 66, in powder weight loss feeders, load teflon resin/copper powder-1/ antioxidant 1010 mass ratio is the uniform mixture of 100:100:0.5.After barrel actual temperature reaches design temperature, open twin screw makes its rotating speed reach 160 revs/min, then pellet resins weight loss feeders and powder resin weight loss feeders is opened, pellet resins feed rate is made to be 2.4kg/h, powder resin feed rate is 0.60kg/h, four strands of 12K continuous carbon fibres introduce twin-screw extruder barrel from the 4th section of opening, be extruded into strip after resin and carbon fiber mixing, namely obtain thermoplastic resin friction materials through water-cooled pelletizing.
Above-mentioned thermoplastic resin friction materials with injection moulding machine (German BOY company 55M type) at 285 DEG C is injection molded into standard testing batten in 90 DEG C of dryings after 8 hours in convection oven.Put into glass desicator (preventing water suction) after each test bars injection moulding completes immediately, then after test environment places 24 hours, test properties, result is as table 1.
[embodiment 2]
twin screw extruder each section of barrel temperature setting is with embodiment 1, in pellet weight loss feeders, load dry Nylon 66, in powder resin weight loss feeders, load teflon resin/copper powder-1/ antioxidant 1010 mass ratio is the uniform mixture of 50:100:0.5.After barrel actual temperature reaches design temperature, open twin screw makes its rotating speed reach 170 revs/min, the feed rate of pellet resins is made to be 5.6kg/h, the feed rate of powder resin is 2.4kg/h, 8 strands of 12K continuous carbon fibres introduce twin-screw extruder barrel from the 4th section of opening, be extruded into strip after resin and carbon fiber mixing, namely obtain thermoplastic resin friction materials through water-cooled pelletizing.The performance that matrix material is tested after injection moulding sample preparation is as table 1.
[embodiment 3]
Twin screw extruder each section of barrel temperature setting is with embodiment 1, in pellet weight loss feeders, load dry Nylon 66, in powder resin weight loss feeders, load teflon resin/copper powder-2/ antioxidant 1010 mass ratio is the uniform mixture of 100:100:0.5.After barrel actual temperature reaches design temperature, open twin screw makes its rotating speed reach 160 revs/min, the feed rate of pellet resins is made to be 3.2kg/h, the feed rate of powder resin is 0.8kg/h, four strands of 12K continuous carbon fibres introduce twin-screw extruder barrel from the 4th section of opening, be extruded into strip after resin and carbon fiber mixing, namely obtain thermoplastic resin friction materials through water-cooled pelletizing.The performance that matrix material is tested after injection moulding sample preparation is as table 1.
[embodiment 4]
Twin screw extruder each section of barrel temperature setting is with embodiment 1, in pellet weight loss feeders, load dry Nylon 66, in powder resin weight loss feeders, load teflon resin/copper powder-2/ antioxidant 1010 mass ratio is the uniform mixture of 100:100:0.5.After barrel actual temperature reaches design temperature, open twin screw makes its rotating speed reach 160 revs/min, the feed rate of pellet resins is made to be 3.2kg/h, the feed rate of powder resin is 0.8kg/h, five strands of 12K carbon fibers introduce twin-screw extruder barrel from the 4th section of opening, be extruded into strip after resin and carbon fiber mixing, namely obtain thermoplastic resin friction materials through water-cooled pelletizing.The matrix material performance of testing after injection moulding sample preparation is as such as table 1.
[comparative example 1]
Twin screw extruder each section of barrel temperature setting is with embodiment 1, and in pellet weight loss feeders, load dry Nylon 66, in powder resin weight loss feeders, load teflon resin/antioxidant 1010 mass ratio is the uniform mixture of 100:0.5.After barrel actual temperature reaches design temperature, open twin screw makes its rotating speed reach 160 revs/min, the feed rate of pellet resins is made to be 2.55kg/h, the feed rate of powder resin is 0.45kg/h, four strands of 12K continuous carbon fibres introduce twin-screw extruder barrel from the 4th section of opening, be extruded into strip after resin and carbon fiber mixing, namely obtain described thermoplastic resin friction materials through water-cooled pelletizing.The matrix material performance of testing after injection moulding sample preparation is as such as table 1.
Can find out from the performance test data of embodiment and comparative example composition, the present invention's employing adds copper powder and has obtained the thermoplastic resin friction materials that one has higher coefficient of friction (0.35 ~ 0.5) and lower wearing and tearing in fibre reinforced wear resistant nylon 66, and this thermoplastic resin friction material also has excellent mechanical property.Why there is so good effect, we think because method of the present invention makes carbon fiber in matrix material maintain higher length-to-diameter ratio, copper powder add the frictional coefficient and hardness that not only increase matrix material, and improve thermotolerance and the work-ing life of matrix material.
the character of table 1. modified carbon fiber reinforced PA66 resin combination
| Test subject and unit | Comparative example 1 | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Composition | |||||
| PA66，% | 55.4 | 57.7 | 49.8 | 60.6 | 53.4 |
| Copper powder-1, % | 0 | 7.2 | 14.2 | 0 | 0 |
| Copper powder-2, % | 0 | 0 | 7.5 | 7.4 | |
| PTFE，% | 9.8 | 7.2 | 7.1 | 7.5 | 7.4 |
| Antioxidant 1010, % | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| CF，% | 34.7 | 27.8 | 28.8 | 24.3 | 31.7 |
| Character | |||||
| Tensile strength, MPa | 235.9 | 259.5 | 232.9 | 269.5 | 272.0 |
| Flexural strength, MPa | 374.0 | 414.0 | 359.6 | 402.7 | 410.7 |
| Modulus in flexure, MPa | 24339 | 25832 | 21231 | 21339 | 23419 |
| Izod notched Izod impact strength, 3.2mm, J/m | 129 | 136 | 124 | 151 | 137 |
| Izod unnotched impact strength, 3.2mm, J/m | 960 | 1143 | 1066 | 1162 | 1085 |
| Rockwell hardness, M scale | 96.5 | 99 | 124.8 | 99 | 100 |
| Frictional coefficient | 0.25 | 0.48 | 0.41 | 0.38 | 0.40 |
| Wearing and tearing, mg | 3.3 | 5.0 | 3.0 | 6.0 | 3.8 |
Claims (10)
1. thermoplastic resin friction materials, comprises following component with weight parts:
A.45 ~ 70 parts of Nylon 66s;
B.1 ~ 20 parts of copper powders;
C.5 ~ 15 parts of polytetrafluoroethylene (PTFE) resins;
D.10 ~ 40 parts of carbon fibers;
E.0.01 ~ 5 parts of auxiliary agents.
2. thermoplastic resin friction materials according to claim 1, is characterized in that the relative viscosity of described Nylon 66 is 2.4 ~ 3.2.
3. thermoplastic resin friction materials according to claim 1, is characterized in that the order number of described copper powder is greater than 100 orders.
4. thermoplastic resin friction materials according to claim 1, is characterized in that the particle diameter of described teflon resin is 2 ~ 20 microns.
5. thermoplastic resin friction materials according to claim 1, is characterized in that described carbon fiber adopts continuous fiber.
6. thermoplastic resin friction materials according to claim 1, is characterized in that described auxiliary agent is at least one in thermo-stabilizer, oxidation inhibitor or compatilizer.
7. thermoplastic resin friction materials according to claim 1, is characterized in that described 66 resins are 50 ~ 65 parts with weight parts consumption.
8. thermoplastic resin friction materials according to claim 1, is characterized in that described copper powder is 2 ~ 15 parts with weight parts consumption.
9. thermoplastic resin friction materials according to claim 1, is characterized in that described teflon resin is 5 ~ 10 parts with its consumption of weight parts.
10. the preparation method of the friction materials of thermoplastic resin described in claim 1, comprises following process:
I) Nylon 66 is 80 ~ 100 DEG C of vacuum-dryings 8 ~ 12 hours;
II) Nylon 66, copper powder, teflon resin and described auxiliary agent add in twin screw extruder by weight proportion and mix, and twin-screw extruder barrel temperature is 250 ~ 300 DEG C;
III) continuous length carbon fiber is from twin screw extruder intermediate openings introducing resin system, and carbon fiber is sheared fragmentation in twin screw extruder, extrudes together with resin, and then pelletizing obtains described thermoplastic resin friction materials.
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| CN107434914A (en) * | 2016-05-27 | 2017-12-05 | 株洲时代新材料科技股份有限公司 | Advanced fiber reinforced composites and the spacing side shield made using the material |
| CN111971491A (en) * | 2018-04-23 | 2020-11-20 | 旭化成株式会社 | Gear containing cellulose |
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| CN1590455A (en) * | 2003-09-05 | 2005-03-09 | 中国科学院兰州化学物理研究所 | Abrasion resistant self lubricating nylon complex material and its preparation method |
| CN1850883A (en) * | 2006-05-29 | 2006-10-25 | 南京航空航天大学 | Supersonic motor carbon fiber modified PTFE base friction material, and its preparing method |
| CN101343409A (en) * | 2008-08-27 | 2009-01-14 | 毛惠敏 | Carbon fiber reinforced composite and preparation thereof |
| CN101544078A (en) * | 2009-04-14 | 2009-09-30 | 江苏大学 | Damping and wear resistant composite material and preparation method thereof |
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| CN1590455A (en) * | 2003-09-05 | 2005-03-09 | 中国科学院兰州化学物理研究所 | Abrasion resistant self lubricating nylon complex material and its preparation method |
| CN1850883A (en) * | 2006-05-29 | 2006-10-25 | 南京航空航天大学 | Supersonic motor carbon fiber modified PTFE base friction material, and its preparing method |
| CN101343409A (en) * | 2008-08-27 | 2009-01-14 | 毛惠敏 | Carbon fiber reinforced composite and preparation thereof |
| CN101544078A (en) * | 2009-04-14 | 2009-09-30 | 江苏大学 | Damping and wear resistant composite material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107434914A (en) * | 2016-05-27 | 2017-12-05 | 株洲时代新材料科技股份有限公司 | Advanced fiber reinforced composites and the spacing side shield made using the material |
| CN111971491A (en) * | 2018-04-23 | 2020-11-20 | 旭化成株式会社 | Gear containing cellulose |
| CN111971491B (en) * | 2018-04-23 | 2024-01-16 | 旭化成株式会社 | Gear containing cellulose |
| US12007001B2 (en) | 2018-04-23 | 2024-06-11 | Asahi Kasei Kabushiki Kaisha | Cellulose-containing gear |
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