CN107471676A - A kind of preparation method of polyparaphenylene's Benzo-dioxazole fiber-reinforced resin matrix compound material - Google Patents
A kind of preparation method of polyparaphenylene's Benzo-dioxazole fiber-reinforced resin matrix compound material Download PDFInfo
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- CN107471676A CN107471676A CN201710672363.3A CN201710672363A CN107471676A CN 107471676 A CN107471676 A CN 107471676A CN 201710672363 A CN201710672363 A CN 201710672363A CN 107471676 A CN107471676 A CN 107471676A
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/32—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core on a rotating mould, former or core
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- Mechanical Engineering (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The invention discloses the method that one kind prepares polyparaphenylene's Benzo-dioxazole (abbreviation PBO) fiber-reinforced resin matrix compound material, pbo fiber reinforced resin based composites of the present invention are prepared using wet winding technology technique, and online ultrasonic treatment unit is introduced in preparation process.Device installation is simple, quick detachable, easy to operate, can continuous production, production efficiency is high.Online ultrasonic treatment unit Parameter adjustable, installation site can also be adjusted as needed, realize that resin infiltrates the improvement of quality to fiber.This method can be used for preparing wet winding technology composite product, such as pressure vessel, pipeline；Also prepreg can be prepared into, the intermediate raw material as hot-forming composite products uses.Pbo fiber composite made from this method is few compared with composite material defect made from conventional method, interfacial bond property is high, especially interlaminar shear strength significantly improves, the problem of pbo fiber enhancing composite interlayer performance is poor is improved, the performance and application benefit of pbo fiber enhancing composite can be effectively improved.
Description
Technical field
The present invention relates to a kind of polyparaphenylene's Benzo-dioxazole (Poly-p-phenylene Benzobisoxazole,
PBO) the preparation method of fiber-reinforced resin matrix compound material, and in particular to a kind of comprising including online ultrasonic treatment unit
The preparation method of wet winding technology pbo fiber reinforced resin based composites.
Background technology
As the defense technology such as continuous development, the Aero-Space field of science and technology proposes higher want to fibrous composite
Ask.The polyparaphenylene's Benzo-dioxazole fiber quickly grown in recent years is because it is in specific strength, specific modulus, heat resistance and anti-flammability etc.
The special benefits of aspect are considered as the super fiber in 2l centuries, especially have important application prospect in national defence.Pbo fiber is high
The rigid rod structure of degree conjugation determines that it has the excellent physical and mechanical properties such as high specific strength, high ratio modulus and chemically
Can, but the fiber surface unusual light, groove is few, and polarity and surface-active are small, shows very strong physics and chemical inertness, makes
Pbo fiber be not easy it is relatively low by resin infiltration, interface binding intensity.Pbo fiber reinforced resin based composite material interface performance is weak
The shortcomings that seriously constrain its technology development and engineer applied, therefore improve pbo fiber/resin boundary surface adhesive property, it has also become
Give full play to pbo fiber performance, promote the key of pbo fiber and its composite development and application.
Recent domestic scholar has carried out numerous studies for the relevant issues of pbo fiber composite material interface, studies
Focus on and pbo fiber surface is modified using chemically and physically method, mainly include strong acid oxide etch, grafting altogether
The methods of poly-, high-energy ray irradiation processing and corona treatment.It is interface characteristics for the modification positive effect of fiber surface
It can significantly improve, but the usual complex technical process of fiber surface modification method, cost is high, and easily damages fiber bodies, in work
Operability is not strong in Cheng Yingyong.
At present, prepare the most important method of pbo fiber composite be wound around shaping and it is hot-forming.The present invention is in routine
On the basis of winding shaping process, increase supersonic treatment link, on the basis of winding process is not influenceed, pass through ultrasound
Ripple reinforced resin provides safeguard to the wellability of pbo fiber to improve composite material interface performance.
Ultrasonication is to play getter action, cavitation effect, temperature effect in composite preparation process using ultrasonic wave
Should be with peptizaiton etc., so as to improve the preparation quality of composite, reduce defect.In existing patent, ultrasonic wave is more
Be applied to the scattered and degasification of each component or modified filler in resin, reduce the gas density in resin, but do not have patent
By ultrasonic applications in the preparation technology of fiber-reinforced resin matrix compound material, pbo fiber composite is more not applied to
In winding process.
So far, there is not the patent specifically for pbo fiber reinforced resin based composites moulding process also both at home and abroad.
For pbo fiber excellent combination property, but pbo fiber reinforced resin based composites interface layer poor performance, while fiber table
Surface modification process is not easy to the present situation of large-scale industrial production, carries out being adapted to industrial composite material process planning to improve
And optimization, had important practical significance so as to improve pbo fiber composite material interface performance.
The content of the invention
It is an object of the invention to provide it is a kind of it is convenient and swift, simply efficiently can be used for large-scale industrial production PBO
The method of fiber-reinforced resin matrix compound material wet winding technology.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of preparation method of polyparaphenylene's Benzo-dioxazole (PBO) fiber-reinforced resin matrix compound material, including it is following
Step：Pbo fiber enters the gumming device containing resin, and resin fully infiltrates continuous fiber, obtains pre-soaking fiber beam；In impregnation
During or process after introduce online ultrasonic treatment unit.
Further, the online ultrasonic treatment unit is mainly popped one's head in comprising ultrasonic vibration generator and ultrasonic boundling.Institute
The ultrasonic boundling probe stated can be placed in fiber steeping vat or be placed in fiber by after steeping vat impregnation.Described ultrasonic boundling
The probe leading portion of probe can contact fibre bundle or away from fibre bundle certain distance.
Further, when probe is placed in after fiber impregnation, probe needs and fiber contacts.
The dress used in the preparation method of polyparaphenylene's Benzo-dioxazole (PBO) fiber-reinforced resin matrix compound material
Put, the device includes creel, steeping vat and online ultrasonic treatment unit, and described online ultrasonic treatment unit mainly includes
Ultrasonic vibration generator and ultrasonic boundling probe；Pbo fiber is placed on creel, according to the distribution of Wiring apparatus roller bearing, PBO is fine
Dimension is wound between each roller bearing successively, and mould or core are arranged on wrapping machine；The firm ultrasonic boundling probe of connection and ultrasonic shake
Dynamic generator, ultrasonic boundling probe can be placed in fiber steeping vat or be placed in fiber by after steeping vat impregnation, starting winding
Machine, pbo fiber is set to pass through the steeping vat equipped with glue and online ultrasonic treatment unit according to certain hauling speed.
It is applied to prepare the resin system of pbo fiber reinforced resin based composites in the present invention including but not limited to epoxy
Resin, unsaturated polyester (UP), bimaleimide resin, phenolic resin etc..
In the present invention, pbo fiber is placed on creel, and each roller bearing passed sequentially through in wrapping machine device enters containing resin
Gumming device, fiber impregnation mode include gluing method (referring to shown in accompanying drawing 3-1) and cement-dipping method (referring to shown in accompanying drawing 3-2) two
Kind, resin fully infiltrates continuous fiber, obtains pre-soaking fiber beam.Online ultrasonication is introduced in immersing glue process or after process
Device.Pre-soaking fiber beam acts on by jockey pulley and Guide head, obtains the winding tension for meeting that winding requires, fibre bundle is according to one
Determine mode and be wound into cured on mould to obtain composite product, such as pipeline, pressure vessel.Pre-soaking fiber beam also can be through one
Determine canoe to wind to obtain prepreg, the intermediate raw material as hot-forming composite.According to the requirement of product, will presoak
Material is cut according to certain size, quantity and machine direction, is laid according to the ply sequence of regulation in molding die preforming
Body, after by mould be placed in hot press by certain system solidify prepare compression molding composite.
The online ultrasonic treatment unit for wet winding technology technique is included in the present invention, mainly comprising ultrasonic vibration
Generator and ultrasonic boundling probe, ultrasonic boundling probe can be placed in fiber steeping vat or be placed in fiber by steeping vat impregnation it
Afterwards, leading portion of popping one's head in can contact fibre bundle or away from fibre bundle certain distance.Ultrasonic power and supersonic frequency are adjustable.
Advantages of the present invention：
(1) heretofore described resin system species is more, applied widely, available for the PBO for preparing various kinds of resin type
Fiber-reinforced resin matrix compound material, requirement of the different use environments to resin and composite in actual production can be met.
(2) heretofore described wet-winding craft, there is the characteristics of good winding efficiency high, Forming Quality, automation, just
In industrialized production and application.
(3) the online ultrasonic treatment unit composition letter included in heretofore described wet winding technology technical process
List, convenient disassembly, operation are easy, easy to use, available for the large-scale industrial production of wet winding technology, can be achieved continuous
Production, production efficiency are high.Various product, such as pressure vessel, pipeline can be directly prepared, prepreg can be also prepared, as hot pressing
The intermediate raw material of forming composite product.
(4) heretofore described online ultrasonic treatment unit parameter regulation is convenient, can be by changing ultrasonic power, surpassing
The distance of acoustic frequency, ultrasonic time, ultrasound probe position and ultrasonic probe away from fiber realizes different effect of impregnation, more flexible
Ground improves composite material interface performance.
(5) it is fine to PBO can to effectively improve resin for the online ultrasonic impregnation process in heretofore described wet-winding craft
The effect of impregnation of dimension, and composite inner hole is reduced, improve composite materials property.
(6) heretofore described method can improve composite layer mainly for pbo fiber reinforced resin based composites
Between performance, improve pbo fiber reinforced resin based composites application benefit.
Brief description of the drawings
Fig. 1 is pbo fiber reinforced resin based composites preparation technology flow chart of the present invention.
Fig. 2 is the online ultrasonic treatment unit schematic diagram of wet winding technology technique of the present invention.Wherein 1 is creel, 2
It is that ultrasonic boundling is popped one's head in for steeping vat, 3,4 be Wrapping formed composite or prepreg.
Fig. 3 is Wrapping formed online ultrasonic treatment unit ultrasound boundling probe present position schematic diagram of the present invention.
3-1 is that ultrasonic boundling probe is placed in after fiber impregnation, and 3-2 is that ultrasonic boundling is popped one's head in fiber immersing glue process, positioned at impregnation
In groove.Wherein 1 is steeping vat (inside having resin), and 2 be that ultrasonic boundling is popped one's head in, and 3 be fibre bundle, and 4 be glue spreader.
Embodiment
From suitable resin and curing agent configuration wet winding technology technique resin system, ring can be selected in wherein resin
Oxygen tree fat, unsaturated polyester (UP), bimaleimide resin, phenolic resin etc..It can add and be modified in resin system as needed
Filler (such as CNT), further improve composite material interface performance.The control of resin system viscosity is configured at room temperature (25 DEG C)
Lower 0.1-2Pas.
Pbo fiber takes out and is placed on creel.Pbo fiber should seal when not in use because of easy moisture absorption, easy ultraviolet ageing
Lucifuge kept dry.According to the requirement of Wiring apparatus, pbo fiber is wound between each roller bearing successively.
Vltrasonic device is built, after consolidating the ultrasonic boundling probe of connection and ultrasonic vibration generator, fixed ultrasonic boundling is visited
Head, probe can be placed in as required after fiber impregnation or probe is placed in impregnation glue groove, can when being placed in impregnation glue groove
Position between adjustment probe and fiber as needed, can make probe and fiber contacts, can also leave certain distance.Probe is placed in
When after fiber impregnation, probe needs and fiber contacts.Refer to shown in accompanying drawing 3.
The glue configured is poured into glue groove, adjusts ultrasonic vibration generator parameter, sets ultrasonic power can be in 100-
Between 1000W, supersonic frequency can be between 1-60kHz.Wrapping machine is opened, adjusts wrapping machine parameter, sets winding tension can be
Between 1-50N, set speed can be between 0.5-100m/min, can be in 0.1- depending on yarn spacing foundation fiber width is set
Between 10mm.According to target thickness of composite material and required fiber volume fraction, carried out with reference to pbo fiber line density and volume density
Calculate, it is determined that the winding number of plies.
It is completely wound after shaping, gained product is put into baking oven and rotates solidification, according to the curing process needed for resin
System is solidified.Product is taken out after the curing be complete, obtains pbo fiber reinforced resin matrix composite product.It can also make
For into prepreg, the intermediate raw material as hot-forming composite products uses.
Embodiment
Specific embodiment 1
(1) material prepares：100 parts of epoxy resin, weigh the modified imidazole class curing agent of 13 parts by weight.In parts by weight,
The KH560 silane couplers of gross weight 2% are weighed, are stirred under conditions of being 10 DEG C~30 DEG C in temperature.Obtain for wet
The resin system of method winding shaping process, set aside for use.
(2) device prepares：Pbo fiber is placed on creel.According to the distribution of Wiring apparatus roller bearing, pbo fiber is twined successively
It is around between each roller bearing, using accompanying drawing 3-1 mode impregnations.Steel core is selected as liner, by mould installion on wrapping machine
It is stand-by.Vltrasonic device is built, the ultrasonic boundling probe of connection and ultrasonic vibration generator is consolidated, fixed ultrasonic boundling probe, will visit
Head is placed in after fiber impregnation, probe and fiber contacts.Step (1) made glue is placed in steeping vat.Adjust ultrasonic vibration
Generator parameter, set ultrasonic power continual ultrasonic can be handled in 20kHz, winding process in 300W, supersonic frequency.
(3) wind：Start wrapping machine, pbo fiber is passed through according to certain hauling speed equipped with prepared by step (2)
The steeping vat and Vltrasonic device of glue.Wrapping formed parameter is set, speed of wrap 20m/min, winding tension 10N, is wound between yarn
Away from 0.5mm, 10 layers of the number of plies is preset.Pre-soaking fiber beam twines after jockey pulley in the way of ring winding and spiral winding
Around interior lining, the designed number of plies is successively wound into, obtains preform.
(4) preform solidifies：Preform is placed in heat up according to certain curing process system in baking oven and heated,
Preform is kept to be rotated according to certain speed in solidification process.Curing cycle is：80 DEG C are warming up to from room temperature (25 DEG C),
Heating rate is 2 DEG C/min, 80 DEG C of insulation 2h, then is warming up to 120 DEG C, and heating rate is 2 DEG C/min, is incubated under the conditions of 180 DEG C
1h, cool to 50 DEG C, cooldown rate is 2 DEG C/min.The pbo fiber prepared through wet winding technology technique is finally given to increase
Strong polymer matrix composites product.
Pbo fiber reinforced resin based composites made from the method, it is 50MPa to measure interlaminar shear strength.
Specific embodiment 2
(1) material prepares：The resinite of prepreg is prepared as wet-winding craft using bimaleimide resin
System.
(2) device prepares：Pbo fiber is placed on creel.According to the distribution of Wiring apparatus roller bearing, pbo fiber is twined successively
It is around between each roller bearing, using accompanying drawing 3-2 mode impregnations.The metal circular cylinder of 1m diameters is selected as the core for preparing prepreg
Mould, mandrel surface post release liners.Vltrasonic device is built, consolidates the ultrasonic boundling probe of connection and ultrasonic vibration generator, it is fixed
Ultrasonic boundling probe, probe is placed in fiber steeping vat, and probe is with fiber at a distance of about 2mm.Step (1) made glue is placed in
In steeping vat.Ultrasonic vibration generator parameter is adjusted, sets ultrasonic power can be wrapped in 450W, supersonic frequency in 40kHz
Continual ultrasonic is handled in journey.
(3) wind：Start wrapping machine, pbo fiber is passed through according to certain hauling speed equipped with prepared by step (2)
The steeping vat and Vltrasonic device of glue.Wrapping formed parameter is set, speed of wrap 50m/min, winding tension 30N, is wound between yarn
Away from 2mm, the number of plies is 1 layer.Pre-soaking fiber beam is wound on core in the way of ring is wound, wound after jockey pulley
It is completely wound after to designed prepreg width, in end cut staple.As needed, core can continue the timing of rotation one
Between, to remove the solvent or other volatile materials in resin.
(4) mould pressing process：The unidirectional pre-immersion material of preparation is removed from core, surface covering thin transparent film, presoaked
Expect finished product.According to the requirement of product, prepreg is cut according to certain size, quantity and machine direction, remove surface film and
Preform is laid in molding die according to the ply sequence of regulation after release liners.Mould is placed in hot press, according to one
Fixed curing process system heating heating, curing cycle are：150 DEG C are warming up to from room temperature (25 DEG C), heating rate is 2 DEG C/
Min, 150 DEG C of insulation 2h, then is warming up to 200 DEG C, and heating rate is 2 DEG C/min, and 3h is incubated under the conditions of 200 DEG C, cool to
60 DEG C, cooldown rate is 2 DEG C/min；Pressure is 2MPa in technical process.Finally give pbo fiber reinforced resin based composites
Moulded parts.
Pbo fiber reinforced resin based composites made from the method, it is 45MPa to measure interlaminar shear strength.
Claims (10)
1. a kind of preparation method of polyparaphenylene's Benzo-dioxazole (PBO) fiber-reinforced resin matrix compound material, including following step
Suddenly：
Pbo fiber enters the gumming device containing resin, and resin fully infiltrates continuous fiber, obtains pre-soaking fiber beam；In impregnation
During or process after introduce online ultrasonic treatment unit.
2. according to the method for claim 1, it is characterised in that：Described online ultrasonic treatment unit, it is main comprising super
Acoustic vibration generator and ultrasonic boundling probe.
3. according to the method for claim 2, it is characterised in that：Described ultrasonic boundling probe can be placed in fiber steeping vat
Or fiber is placed in by after steeping vat impregnation.
4. according to the method for claim 2, it is characterised in that：The accessible fibre of probe leading portion of described ultrasonic boundling probe
Tie up beam or away from fibre bundle certain distance.
5. according to the method for claim 4, it is characterised in that：When probe is placed in after fiber impregnation, probe needs and fiber
Contact.
6. according to the method for claim 1, it is characterised in that：For preparing pbo fiber reinforced resin based composites
Resin system is the one or more in epoxy resin, unsaturated polyester (UP), bimaleimide resin or phenolic resin.
7. according to the method for claim 1, it is characterised in that：Fiber impregnation mode is gluing method or cement-dipping method.
8. according to the method for claim 1, it is characterised in that：Pre-soaking fiber beam acts on by jockey pulley and Guide head, fine
Wrapping is cured on mould obtains composite product for dimension.
9. according to the method for claim 1, it is characterised in that：Pre-soaking fiber beam acts on by jockey pulley and Guide head, twines
Around obtaining prepreg.
10. the system of any one of claim 1-9 polyparaphenylene's Benzo-dioxazole (PBO) fiber-reinforced resin matrix compound materials
The device used in Preparation Method, it is characterised in that：The device includes creel, steeping vat and online ultrasonic treatment unit, described
Online ultrasonic treatment unit mainly popped one's head in comprising ultrasonic vibration generator and ultrasonic boundling；Pbo fiber is placed on creel, is pressed
According to the distribution of Wiring apparatus roller bearing, pbo fiber is wound between each roller bearing successively, mould or core are arranged on wrapping machine；
The firm ultrasonic boundling probe of connection and ultrasonic vibration generator, ultrasonic boundling probe can be placed in fiber steeping vat or be placed in fiber
After steeping vat impregnation, start wrapping machine, pbo fiber is passed through the steeping vat equipped with glue according to certain hauling speed
With online ultrasonic treatment unit.
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| CN201710672363.3A CN107471676A (en) | 2017-08-08 | 2017-08-08 | A kind of preparation method of polyparaphenylene's Benzo-dioxazole fiber-reinforced resin matrix compound material |
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| CN201710672363.3A CN107471676A (en) | 2017-08-08 | 2017-08-08 | A kind of preparation method of polyparaphenylene's Benzo-dioxazole fiber-reinforced resin matrix compound material |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108556382A (en) * | 2018-04-13 | 2018-09-21 | 杭州碳谱新材料科技有限公司 | Winding method prepares the device and method of composite laminated plate |
| CN110539419A (en) * | 2019-10-09 | 2019-12-06 | 威海光威精密机械有限公司 | ultrasonic impregnation method and device for composite prepreg |
| CN111409293A (en) * | 2020-03-31 | 2020-07-14 | 华南理工大学 | Dipping method of ultrasonic reinforced long fiber reinforced polymer composite material and ultrasonic reinforced long fiber reinforced polymer composite material |
| CN111497201A (en) * | 2020-04-26 | 2020-08-07 | 江怡 | Winding, processing and forming method of carbon fiber composite pipe fitting |
| CN111546670A (en) * | 2019-02-12 | 2020-08-18 | 三河宇达科技发展有限责任公司 | Equipment for enhancing infiltration effect of resin in base material fiber in production of QFRP optical cable reinforcing core |
| CN113105656A (en) * | 2021-04-06 | 2021-07-13 | 江苏沪江线业有限公司 | Preparation method of poly (p-phenylene-benzobisoxazole) fiber reinforced resin matrix composite material |
| CN114179251A (en) * | 2021-11-23 | 2022-03-15 | 成都飞机工业（集团）有限责任公司 | System and method for preparing continuous fiber reinforced thermoplastic composite prepreg filaments |
| EP3934832A4 (en) * | 2019-03-11 | 2022-12-14 | University of South Carolina | Methods to produce low-defect composite filaments for additive manufacturing processes |
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| CN1734003A (en) * | 2005-08-26 | 2006-02-15 | 哈尔滨工业大学 | Method and device for improving wettability of broad width presoaking material |
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- 2017-08-08 CN CN201710672363.3A patent/CN107471676A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1734003A (en) * | 2005-08-26 | 2006-02-15 | 哈尔滨工业大学 | Method and device for improving wettability of broad width presoaking material |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108556382A (en) * | 2018-04-13 | 2018-09-21 | 杭州碳谱新材料科技有限公司 | Winding method prepares the device and method of composite laminated plate |
| CN111546670A (en) * | 2019-02-12 | 2020-08-18 | 三河宇达科技发展有限责任公司 | Equipment for enhancing infiltration effect of resin in base material fiber in production of QFRP optical cable reinforcing core |
| EP3934832A4 (en) * | 2019-03-11 | 2022-12-14 | University of South Carolina | Methods to produce low-defect composite filaments for additive manufacturing processes |
| CN110539419A (en) * | 2019-10-09 | 2019-12-06 | 威海光威精密机械有限公司 | ultrasonic impregnation method and device for composite prepreg |
| CN111409293A (en) * | 2020-03-31 | 2020-07-14 | 华南理工大学 | Dipping method of ultrasonic reinforced long fiber reinforced polymer composite material and ultrasonic reinforced long fiber reinforced polymer composite material |
| CN111497201A (en) * | 2020-04-26 | 2020-08-07 | 江怡 | Winding, processing and forming method of carbon fiber composite pipe fitting |
| CN113105656A (en) * | 2021-04-06 | 2021-07-13 | 江苏沪江线业有限公司 | Preparation method of poly (p-phenylene-benzobisoxazole) fiber reinforced resin matrix composite material |
| CN114179251A (en) * | 2021-11-23 | 2022-03-15 | 成都飞机工业（集团）有限责任公司 | System and method for preparing continuous fiber reinforced thermoplastic composite prepreg filaments |
| CN114179251B (en) * | 2021-11-23 | 2023-03-14 | 成都飞机工业（集团）有限责任公司 | System and method for preparing continuous fiber reinforced thermoplastic composite prepreg filaments |
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Application publication date: 20171215 |