CN115194982B - Fiber reinforced composite material and preparation method thereof - Google Patents
Fiber reinforced composite material and preparation method thereof Download PDFInfo
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- CN115194982B CN115194982B CN202210904212.7A CN202210904212A CN115194982B CN 115194982 B CN115194982 B CN 115194982B CN 202210904212 A CN202210904212 A CN 202210904212A CN 115194982 B CN115194982 B CN 115194982B
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- 239000000463 material Substances 0.000 title claims abstract description 21
- 239000003733 fiber-reinforced composite Substances 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 104
- 229920005989 resin Polymers 0.000 claims abstract description 73
- 239000011347 resin Substances 0.000 claims abstract description 73
- 239000000178 monomer Substances 0.000 claims abstract description 61
- 230000002787 reinforcement Effects 0.000 claims abstract description 27
- 238000004132 cross linking Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 229920006231 aramid fiber Polymers 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000003999 initiator Substances 0.000 claims description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- 229920003235 aromatic polyamide Polymers 0.000 claims description 5
- 229920005990 polystyrene resin Polymers 0.000 claims description 5
- ICXAPFWGVRTEKV-UHFFFAOYSA-N 2-[4-(1,3-benzoxazol-2-yl)phenyl]-1,3-benzoxazole Chemical compound C1=CC=C2OC(C3=CC=C(C=C3)C=3OC4=CC=CC=C4N=3)=NC2=C1 ICXAPFWGVRTEKV-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229920013716 polyethylene resin Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 2
- 239000005977 Ethylene Substances 0.000 claims description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 2
- 238000004898 kneading Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 description 22
- 238000005520 cutting process Methods 0.000 description 9
- 238000002156 mixing Methods 0.000 description 8
- 239000012783 reinforcing fiber Substances 0.000 description 5
- 238000007598 dipping method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000004760 aramid Substances 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical group N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- YNLAOSYQHBDIKW-UHFFFAOYSA-M diethylaluminium chloride Chemical compound CC[Al](Cl)CC YNLAOSYQHBDIKW-UHFFFAOYSA-M 0.000 description 1
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N dimethyl sulfoxide Natural products CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000008041 oiling agent Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000007586 pull-out test Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical group Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
- B29B15/10—Coating or impregnating independently of the moulding or shaping step
- B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
- B29B15/122—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex
- B29B15/125—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex by dipping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
- B29B15/10—Coating or impregnating independently of the moulding or shaping step
- B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
- B29B15/14—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length of filaments or wires
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The invention discloses a fiber reinforced composite material and a preparation method thereof, wherein the preparation method comprises the following steps: impregnating reinforcement fibers in a resin monomer solution; taking out the reinforcement fiber, and heating and pre-curing; uniformly distributing the pre-cured reinforcement fibers in the resin corresponding to the resin monomer, and then curing and forming. The invention impregnates the reinforcement fiber in the monomer of the resin which needs to be compounded in the fiber, then the fiber has certain stiffness after pre-curing, and the curing and crosslinking reaction between the monomers only carries out part, when the monomer is pre-cured on the surface of the fiber, the surface of the fiber is quite large for the monomer, so the bonding energy of the surface of the fiber is higher, and the monomer is easier to bond with the surface of the fiber; when the fiber is compounded with the resin, as the monomer on the fiber is the monomer of the resin, the monomer which is not completely cured and the resin which is gradually subjected to crosslinking reaction react chemically until the monomer and the resin are completely cured together.
Description
Technical Field
The invention relates to a fiber reinforced composite material, in particular to a fiber reinforced composite material and a preparation method thereof.
Background
Fiber reinforced composites have gained widespread use for over half a century in the past due to their excellent properties, the important role of reinforcing fibers in composites being self-evident. Since the advent of composite materials, reinforcing fibers have undergone a transition from natural fibers to synthetic fibers.
The most common reinforcing fibers at present include glass fibers, aramid fibers, carbon fibers, and the like. The preparation process of the composite material is mainly as follows: after the surface of the reinforcement fiber is modified, various resin forming means are applied to evenly disperse the reinforcement fiber in the resin, and the reinforcement fiber is formed into a composite material after solidification. However, such compounding is generally accompanied by a decrease in mechanical properties of the composite material due to poor interfacial bonding force between the resin and the fibers.
For example, due to the fact that the surfaces of the aramid fibers lack chemical active groups, the polarity is low, the wettability is poor, the defects of rigid molecular chains, high crystallinity, weak intermolecular hydrogen bonding force, low transverse tensile strength, easiness in microfibrillation of the fibers, easiness in water absorption of the surfaces of the fibers and the like are also caused, the interfacial bonding performance between the aramid fibers and a resin matrix is poor, the interlayer shearing strength is low, the exertion of the comprehensive performance of the composite material is influenced, and the application field of the material is limited. Therefore, how to improve the interfacial bonding performance of the aramid fiber reinforced composite material is a hot spot for research in the world of materials at home and abroad. At present, the way to improve the interfacial adhesion of the aramid fiber reinforced composite material is to start from fibers, perform surface treatment on the fibers and introduce active functional groups on the surfaces of the fibers. Although there are many surface treatment methods, after the surface treatment of the fiber, the interlaminar shear strength is improved, but the surface treatment causes a certain degree of damage to the surface structure of the aramid fiber, resulting in a decrease in tensile strength.
Disclosure of Invention
Aiming at the problem of poor interfacial binding force between the resin and the fiber, the invention provides a fiber reinforced composite material and a preparation method thereof.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for preparing a fiber-reinforced composite material, comprising the steps of:
(1) Impregnating reinforcement fibers in a resin monomer solution; before impregnation, the reinforcement fiber can be cleaned in water at 60-80 ℃ to clean the oiling agent and the stain on the surface of the fiber for subsequent modification;
(2) Taking out the reinforcement fiber from the resin monomer solution in the step (1), and performing heating pre-curing;
(3) Uniformly distributing the pre-cured reinforcement fibers obtained in the step (2) in the resin corresponding to the resin monomer, and then curing and forming.
The invention impregnates the reinforcement fiber in the monomer of the resin which needs to be compounded in the fiber, then the fiber has certain stiffness after pre-curing, and the curing and crosslinking reaction between the monomers only carries out part, when the monomer is pre-cured on the surface of the fiber, the surface of the fiber is quite large for the monomer, so the bonding energy of the surface of the fiber is higher, and the monomer is easier to bond with the surface of the fiber; when the fiber is compounded with the resin, the monomer on the fiber is the monomer of the resin, and according to the similar compatibility principle, the monomer which is not completely cured and the resin which is gradually subjected to the crosslinking reaction react chemically until the monomer and the resin are completely cured together.
According to the invention, the resin monomer is used as an intermediate medium for combining the reinforcement fiber and the resin, so that the interfacial binding force between the resin and the fiber is improved, and the mechanical property of the composite material is further improved.
Preferably, in the step (1), the reinforcement fiber is para-aramid fiber, meta-aramid fiber or poly-p-phenylene benzobisoxazole fiber; the resin is polyethylene resin, polyvinyl chloride resin or polystyrene resin.
The reinforcement fiber and the resin monomer solution have good wettability, so that the reinforcement fiber can be ensured to be immersed in the resin monomer solution, and the resin monomer can be uniformly pre-cured on the surface of the reinforcement fiber.
Preferably, in the step (1), the mass concentration of the resin monomer solution is 40 to 80%.
The concentration range can ensure that the pre-cured fiber has certain stiffness, so that the subsequent cutting can be smoothly carried out, and the film on the surface of the pre-cured filament can be more uniform.
Preferably, in step (1), the temperature of the resin monomer solution is 20 to 40 ℃.
At this temperature, the monomer solution has a low viscosity and a certain fluidity, facilitating impregnation, and at this temperature, the monomer solution can be stored for a longer period of time.
In the step (1), the resin monomer solution contains an initiator.
At the temperatures reached, it is not necessary to add an initiator to the polymerization itself, and if the polymerization itself is not carried out at the temperatures reached, it is necessary to add an initiator to assist the polymerization.
Specifically, in the step (2), the pre-curing conditions are: the temperature is 40-90 ℃ and the time is 5-40min. The proper pre-curing condition can ensure that the pre-cured fiber has certain stiffness, so that the subsequent cutting can be smoothly carried out, but the monomer is not subjected to the crosslinking reaction, so that the monomer is not crosslinked with the resin when the subsequent cutting is combined with the resin.
Further, in the step (2), the pre-curing is performed to fully cure 20% -30% of the crosslinking degree.
Preferably, in step (2), the reinforcement fibers are pre-cured and then chopped to a length of 4-6mm for convenient mixing with the resin.
Filament impregnation is a continuous process, not a process in which filaments are sheared and foamed in a monomer solution. The filaments are unreeled, immersed by a monomer solution, then enter an oven for pre-curing, and chopped by a chopping machine after being wound, so that the production continuity is ensured.
Preferably, in the step (3), the pre-cured reinforcement fibers are uniformly distributed in the resin corresponding to the resin monomer by adopting a mixing mode.
The mixing mode is adopted to ensure that the fibers can be more uniformly mixed in the resin, and the more uniform the mixing is, the better the reinforcing effect of the fibers can be macroscopically embodied.
If the matrix material to be kneaded is a resin, a curing agent for the resin needs to be added; if the matrix material is rubber, it is necessary to add plasticizers, fillers, etc.
Preferably, in the step (3), the reinforcing fibers are uniformly distributed in the resin, and the mass ratio of the reinforcing fibers is 10-40%.
In another aspect, the present invention provides a fiber reinforced composite material prepared by the above-described preparation method.
Through the technical scheme, the invention has the following beneficial effects:
the invention impregnates the reinforcement fiber in the monomer of the resin which needs to be compounded in the fiber, then the fiber has certain stiffness after pre-curing, and the curing and crosslinking reaction between the monomers only carries out part, when the monomer is pre-cured on the surface of the fiber, the surface of the fiber is quite large for the monomer, so the bonding energy of the surface of the fiber is higher, and the monomer is easier to bond with the surface of the fiber; when the fiber is compounded with the resin, the monomer on the fiber is the monomer of the resin, and according to the similar compatibility principle, the monomer which is not completely cured and the resin which is gradually subjected to the crosslinking reaction react chemically until the monomer and the resin are completely cured together. According to the invention, the resin monomer is used as an intermediate medium for combining the reinforcement fiber and the resin, so that the interfacial binding force between the resin and the fiber is improved, and the mechanical property of the composite material is further improved.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to examples. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Example 1
The para-aramid fiber filament is subjected to dipping treatment by a styrene solution bath (the temperature is 30 ℃, the concentration is 40 percent, an initiator is azodiisobutyronitrile, the dosage is 0.1 to 0.2 percent of the mass concentration of a monomer), then the dipping treatment is performed by a vacuum oven for pre-curing treatment (the temperature is 90 ℃ for 40 minutes), and then the treated fiber is cut into 6mm short pieces by an ultra-short cutting machine;
and mixing the polystyrene resin and the treated chopped fibers (the mass ratio of the chopped fibers is 10%) to uniformly distribute the chopped fibers in the resin, and then curing and molding the composite material by adopting an autoclave curing mode to prepare the experimental plate with the thickness of 2 mm.
Example 2
The meta-aramid fiber filaments are subjected to dipping treatment by an ethylene solution bath (the temperature is 30 ℃, the concentration is 80 percent, an initiator is titanium tetrachloride or diethyl aluminum chloride, and a solvent is dimethyl sulfoxide), then subjected to vacuum oven pre-curing treatment (the temperature is 40 ℃ for 10 minutes), and then cut into 6mm short pieces by an ultra-short cutting machine;
and mixing the polyethylene resin and the treated chopped fibers (the mass ratio of the chopped fibers is 10%) to uniformly distribute the chopped fibers in the resin, and then curing and molding the composite material by adopting an autoclave curing mode to prepare the experimental plate with the thickness of 2 mm.
Example 3
The PBO fiber (poly-p-phenylene benzobisoxazole fiber) filament is subjected to dipping treatment by a vinyl chloride solution bath (the temperature is 20 ℃, the concentration is 50%, the initiator is azodiisobutyronitrile, and the mass concentration of the monomer is 0.05-0.1%), then the fiber is subjected to vacuum oven pre-curing treatment (the temperature is 45 ℃ for 5 min), and then the treated fiber is cut into 6mm short pieces by an ultra-short cutting machine;
mixing the polyvinyl chloride resin and the treated chopped fibers (the mass ratio of the chopped fibers is 10%) to uniformly distribute the chopped fibers in the resin, and then curing and molding the composite material by adopting an autoclave curing mode to prepare the experimental board with the thickness of 2 mm.
Example 4
Other conditions were the same as in example 1, and the effect of different resin monomer concentrations on the mechanical properties of the composite was verified, and the results are shown in table 1. The test method is as follows:
flexural strength testing was performed according to GB/T9341-2000;
and (3) testing the single wire pulling strength: cutting the pre-cured aramid fiber in each embodiment into fiber sections of about 6cm, sticking the fiber sections on coordinate paper with a space opening, then dripping prepared polystyrene resin glue on the fiber, and curing according to a corresponding curing process (1 section heating rate is 3-5 ℃/min, heating to 180 ℃,2 sections constant temperature and pressure maintaining are carried out for 2 hours, 3 sections cooling rate is 3-8 ℃/min, and cooling to room temperature), so as to prepare a sample for testing the single fiber pulling strength. The sample is clamped on an electronic single yarn strength machine for a pull-out test, the loading speed is 10mm/min, and the calculation formula is as follows: τ=f/(n dl), where F is the maximum pull-out load; l is the length of the fibers embedded in the resin; d is the diameter of the glue drop.
TABLE 1 influence of different resin monomer concentrations on the mechanical Properties of the composite Material
| Numbering device | Resin monomer concentration | Flexural Strength (Mpa) | Monofilament pull-out strength (Mpa) |
| 1 | 40% (example 1) | 41.3 | 32.3 |
| 2 | 50％ | 40.3 | 29.3 |
| 3 | 60％ | 38.8 | 31.1 |
| 4 | 70％ | 42.0 | 30.3 |
| 5 | 80％ | 41.6 | 32.0 |
| 6 | 90％ | 30.5 | 21.7 |
| 7 | 30％ | 31.6 | 20.9 |
As can be seen from table 1, the mechanical properties of the conforming materials are excellent with the appropriate resin monomer concentration.
Example 5
Other conditions were the same as in example 1, and the effect of different pre-curing conditions on the mechanical properties of the composite material was verified, and the results are shown in Table 2, and the test method was the same as above.
TABLE 2 influence of different precuring conditions on the mechanical properties of composite materials
As can be seen from Table 2, the proper pre-curing condition is favorable for improving the mechanical properties of the composite material, and the para-aramid fiber and the styrene are adopted to prepare the composite fiber, and the preferable pre-curing condition is 50-90 ℃ for 20-40min.
Example 6
Other conditions were the same as in example 1, and the effect of different chopped fiber contents on the mechanical properties of the composite material was verified, and the results are shown in Table 3, and the test method was the same as above.
TABLE 3 influence of the different chopped fiber contents on the mechanical properties of the composite materials
| Numbering device | Chopped fiber mass ratio | Flexural Strength (Mpa) |
| 1 | 10% (example 1) | 41.3 |
| 2 | 20％ | 41.7 |
| 3 | 30％ | 40.9 |
| 4 | 40％ | 41.0 |
| 5 | 5％ | 38.8 |
| 6 | 50％ | 37.6 |
Example 7
Other conditions were the same as in example 1, and the effect of different chopped fiber lengths on the mechanical properties of the composite material was verified, and the results are shown in Table 4, and the test method was the same as above.
TABLE 4 influence of different chopped fiber lengths on the mechanical properties of composite materials
Comparative example 1
Cutting para-aramid fiber into 6mm short pieces by an ultra-short cutting machine, mixing polystyrene resin and the short-cut fiber (the mass ratio of the short-cut fiber is 10%), distributing the short-cut fiber in the resin, and then curing and molding the composite material by an autoclave curing mode to prepare an experimental plate with the thickness of 2mm, wherein the bending strength is 32.7Mpa, and the single filament pulling strength is 20.1Mpa which is far lower than that of a sample prepared by the preparation method.
The preferred embodiments of the present invention have been described in detail above with reference to the examples, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solutions of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (8)
1. The preparation method of the fiber reinforced composite material is characterized by comprising the following steps:
(1) Impregnating reinforcement fibers in a resin monomer solution;
(2) Taking out the reinforcement fiber from the resin monomer solution in the step (1), and performing heating pre-curing;
(3) Uniformly distributing the pre-cured reinforcement fibers obtained in the step (2) in the resin corresponding to the resin monomer, and then curing and forming;
in the step (1), the reinforcement fiber is para-aramid fiber, meta-aramid fiber or poly-p-phenylene benzobisoxazole fiber; the resin is polyethylene resin, polyvinyl chloride resin or polystyrene resin; the resin monomer solution is a styrene solution, an ethylene solution or a vinyl chloride solution; the resin monomer solution contains an initiator.
2. The method for producing a fiber-reinforced composite material according to claim 1, wherein in the step (1), the mass concentration of the resin monomer solution is 40 to 80%, and the temperature of the resin monomer solution is 20 to 40 ℃.
3. The method of producing a fiber-reinforced composite material according to claim 1, wherein in step (2), the pre-curing conditions are: the temperature is 40-90 ℃ and the time is 5-40min.
4. The method of producing a fiber-reinforced composite material according to claim 1, wherein in the step (2), the pre-curing reaches 20% to 30% of the degree of cross-linking of the complete curing.
5. The method of producing a fiber-reinforced composite material according to claim 1, wherein in step (2), the reinforcement fibers are pre-cured and then chopped to a chopping length of 4 to 6mm.
6. The method of producing a fiber-reinforced composite material according to claim 1, wherein in step (3), the precured reinforcement fibers are uniformly distributed in the resin corresponding to the resin monomer by kneading.
7. The method of producing a fiber-reinforced composite material according to claim 1, wherein in the step (3), the reinforcing body fibers are uniformly distributed in the resin, and the reinforcing body fibers account for 10 to 40% by mass.
8. A fiber reinforced composite material produced by the production method according to any one of claims 1 to 7.
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| CN111534048A (en) * | 2020-04-09 | 2020-08-14 | 上海大学 | Thermosetting resin-based PBO fiber composite material and preparation method thereof |
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