CN113789659A - Surface modified Kevlar fiber and preparation method and application thereof - Google Patents
Surface modified Kevlar fiber and preparation method and application thereof Download PDFInfo
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- CN113789659A CN113789659A CN202111198245.6A CN202111198245A CN113789659A CN 113789659 A CN113789659 A CN 113789659A CN 202111198245 A CN202111198245 A CN 202111198245A CN 113789659 A CN113789659 A CN 113789659A
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- 239000000835 fiber Substances 0.000 title claims abstract description 110
- 229920000271 Kevlar® Polymers 0.000 title claims abstract description 101
- 239000004761 kevlar Substances 0.000 title claims abstract description 101
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 claims abstract description 48
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000005051 trimethylchlorosilane Substances 0.000 claims abstract description 24
- 238000012986 modification Methods 0.000 claims abstract description 23
- 230000004048 modification Effects 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011664 nicotinic acid Substances 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 4
- 238000007603 infrared drying Methods 0.000 claims abstract description 4
- 239000013557 residual solvent Substances 0.000 claims abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims description 22
- 239000011347 resin Substances 0.000 claims description 22
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 18
- 239000011496 polyurethane foam Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 4
- 239000013013 elastic material Substances 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- 230000003592 biomimetic effect Effects 0.000 claims 1
- 230000003746 surface roughness Effects 0.000 abstract description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052710 silicon Inorganic materials 0.000 abstract description 5
- 239000010703 silicon Substances 0.000 abstract description 5
- 229910014575 C—Si—N Inorganic materials 0.000 abstract description 3
- 229920002635 polyurethane Polymers 0.000 description 11
- 239000004814 polyurethane Substances 0.000 description 11
- 229920003023 plastic Polymers 0.000 description 10
- 239000004033 plastic Substances 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000011133 lead Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 5
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
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- 238000002474 experimental method Methods 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910021419 crystalline silicon Inorganic materials 0.000 description 2
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010865 video microscopy Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229960003638 dopamine Drugs 0.000 description 1
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- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
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- 229920001690 polydopamine Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
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- 238000004611 spectroscopical analysis Methods 0.000 description 1
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Images
Classifications
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/50—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with organometallic compounds; with organic compounds containing boron, silicon, selenium or tellurium atoms
- D06M13/51—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond
- D06M13/513—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond with at least one carbon-silicon bond
- D06M13/517—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond with at least one carbon-silicon bond containing silicon-halogen bonds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J1/00—Targets; Target stands; Target holders
- F41J1/01—Target discs characterised by their material, structure or surface, e.g. clay pigeon targets characterised by their material
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/30—Synthetic polymers consisting of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/34—Polyamides
- D06M2101/36—Aromatic polyamides
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Textile Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a surface modified Kevlar fiber and a preparation method and application thereof, and the surface modified Kevlar fiber comprises the following steps: (1) firstly, cutting Kevlar fiber into fiber sections; (2) dichloromethane is used as a solvent, trimethylchlorosilane is used as a modification reagent, and the dichloromethane and the sheared Kevlar fiber are stirred in a water bath; (3) and (3) after stirring in a water bath, standing for 30min at room temperature, washing for 5 times by using dichloromethane, and drying for 6h in an infrared drying oven to completely volatilize the residual solvent on the surface of the fiber to obtain the surface modified Kevlar fiber. The surface modified Kevlar fiber obtained by the invention is used as a material for preparing the bionic captive bomb. The invention uses trimethylchlorosilane to modify Kevlar fiber. Compared with the Kevlar before modification, the Kevlar surface modified by the trimethylchlorosilane contains silicon elements, and the silicon elements on the surface of the modified fiber exist in a C-Si-N form; the surface roughness after modification was increased by 5.6%.
Description
Technical Field
The invention relates to the technical field of elastic materials, in particular to a surface modified Kevlar fiber and a preparation method and application thereof.
Background
In the case of a ballistic material, Kevlar fibers are generally present in the fiber woven layer and the fiber reinforced resin layer. However, the Kevlar fiber has low surface activity, poor wettability and loose combination with a matrix, thereby influencing the mechanical property of the whole composite material.
Disclosure of Invention
Aiming at the technical problems, the invention provides a surface modified Kevlar fiber and a preparation method and application thereof.
The specific technical scheme is as follows:
the preparation method of the surface modified Kevlar fiber comprises the following steps:
(1) firstly, cutting Kevlar fiber into fiber sections;
(2) dichloromethane is used as a solvent, trimethylchlorosilane is used as a modification reagent, and the dichloromethane and the sheared Kevlar fiber are stirred in a water bath;
(3) and (3) after stirring in a water bath, standing for 30min at room temperature, washing for 5 times by using dichloromethane, and drying for 6h in an infrared drying oven to completely volatilize the residual solvent on the surface of the fiber to obtain the surface modified Kevlar fiber.
Step (1) cutting Kevlar fiber into fiber sections with the length of 3 mm.
And (2) carrying out water bath at 35 ℃, wherein the rotating speed of a stirring rotor is 310r/min, and the stirring time is 4-12 h.
According to the invention, through adding the trimethylchlorosilane, the trimethylsilyl is introduced on the surface of the Kevlar fiber, the trimethylsilyl is unstable, the C-Si bond is unstable and is easy to oxidize and decompose, and finally the trimethylsilyl is converted into SiO on the Kevlar surface2。
Because the surface of the Kevlar fiber has no active groups and has poor binding capacity with other materials, the Kevlar fiber is modified by using trimethylchlorosilane. The modified Kevlar fiber is characterized by using a video microscope, a Fourier infrared instrument and a scanning electron microscope, and the fact that the surface roughness of the Kevlar fiber modified by trimethylchlorosilane is improved and a group which does not exist exists is found. This result indicates that it is effective to treat the Kevlar fiber.
The surface modified Kevlar fiber obtained by the invention is used as a material for preparing the bionic captive bomb.
The invention also provides a bionic capture bomb material which comprises a front surface and a back plate, wherein the front surface is made of polyurethane foam material, the back plate is made of Kevlar fiber reinforced resin, and the Kevlar fiber reinforced resin is composed of the surface modified Kevlar fiber and resin.
Further, the front surface comprises six layers, namely a first layer of polyurethane soft foam, and polyurethane hard foam with the hardness increasing continuously is adopted from the second layer to the sixth layer; the seventh layer is a back plate, Kevlar fiber reinforced resin is adopted, and the seven layers of materials are bonded together through thermosetting resin.
The primary function of the polyurethane foam part is to capture projectiles, including lead, steel and plastic projectiles. The fiber reinforced resin layer mainly plays a role in protection, plastic bullets and lead bullets usually stay in the polyurethane foam layer, and steel balls can break through the polyurethane foam layer and cannot break through the Kevlar fiber reinforced resin layer.
The invention provides a target plate material capable of capturing shot launched by different non-standard guns based on the structural characteristics of biological squama, and aims at the defects of low surface activity and insufficient strength of Kevlar fibers used in a back plate, and trimethylchlorosilane is used for modifying the Kevlar fibers. The result shows that the trimethylchlorosilane is coupled with the amino group on the surface of the Kevlar fiber to form a net structure; observing the morphology of the modified Kevlar fiber through an optical microscope and a scanning electron microscope, and finding that trimethylchlorosilane is adhered (anchored) on the surface of the fiber; scanning electron microscope and energy spectrum (SEM-EDS) analysis show that compared with the Kevlar before modification, the Kevlar surface after trimethylchlorosilane modification contains silicon elements; XPS analysis shows that the silicon element on the surface of the modified fiber exists in a C-Si-N form; the AFM test showed that the surface roughness after modification increased by 5.6%.
Drawings
FIG. 1a is a microscopic image of Kevlar fibers obtained by stirring for 4h in an example;
FIG. 1b is a microscopic image of Kevlar fibers obtained by stirring for 4h according to an example;
FIG. 1c is a microscopic image of Kevlar fibers obtained by stirring for 4h according to an example;
FIG. 1d is a microscopic image of Kevlar fibers obtained by stirring for 4h in the example;
FIG. 1e is a microscopic image of Kevlar fibers obtained by stirring for 4h in the example;
FIG. 1f is a microscopic view of an unmodified Kevlar fiber of an example;
FIG. 2a is an SEM image of a trimethylchlorosilane-modified Kevlar fiber of an embodiment;
FIG. 2b is a second SEM image of a trimethylchlorosilane-modified Kevlar fiber of an example;
FIG. 3 is an electron microscope image of a Kevlar fiber after 12h modification by trimethylchlorosilane in the example;
FIG. 4 is a schematic illustration of an embodiment of a non-standard projectile;
FIG. 5a is a schematic side view of an exemplary capture target plate;
FIG. 5b is a schematic front view of an example bullet-capturing target plate;
FIG. 6a is a microscope photograph of a first layer of polyurethane foam for an example capture target plate;
FIG. 6b is a microscope image of a second layer of polyurethane foam for an example capture target plate;
FIG. 6c is a microscope photograph of a third layer of polyurethane foam for an example capture target plate;
FIG. 6d is a microscope photograph of a fourth layer of polyurethane foam for an example capture target plate;
FIG. 6e is a microscope photograph of a fifth layer of polyurethane foam for an example capture target plate;
FIG. 6f is a microscope photograph of a sixth layer of polyurethane foam for an example capture target plate;
FIG. 7 is a video microscope photograph of a Kevlar fiber-reinforced resin of an embodiment;
FIG. 8 is a schematic diagram of an embodiment of a capture target plate capturing an irregular projectile.
Detailed Description
The specific technical scheme of the invention is described by combining the embodiment.
Example 1
The surface modification treatment of the Kevlar fiber comprises the following steps:
(1) firstly, cutting Kevlar fiber into fiber sections with the length of about 3mm, and then taking a small amount of cut Kevlar fiber.
(2) Dichloromethane is used as a solvent, slightly excessive trimethylchlorosilane is used as a modifying reagent, the mixture is stirred in a water bath at the temperature of 35 ℃, the rotating speed of a rotor is 310r/min, five groups of experiments are set, and the variable is stirring time which is respectively 4h, 6h, 8h, 10h and 12 h.
(3) And (3) after stirring in a water bath, standing at room temperature for 30min, washing with dichloromethane for 5 times, and drying in an infrared drying oven for 6h to completely volatilize the residual solvent on the surface of the fiber.
Characterization of the surface-modified Kevlar fiber:
(1) video microscopy analysis
Five groups of modified Kevlar fibers are observed by a video microscope under the condition of 400 times magnification, and the observation results are shown in figures 1a to 1 e. FIGS. 1a, 1b, 1c, 1d and 1e are Kevlar fibers modified with trimethylchlorosilane for 4h, 6h, 8h, 10h and 12h, and FIG. 1f is an unmodified Kevlar fiber. It can be seen from the observation of the video microscope that the Kevlar fiber has more impurity particles on the surface as shown in FIG. 1c, FIG. 1d and FIG. 1e, but is smooth and has less impurities as shown in FIG. 1a and FIG. 1 b. The surface of the Kevlar fiber is not smooth any more with the increase of the treatment time of the trimethylchlorosilane, and small branched chains are generated, so that the surface activity of the Kevlar fiber is gradually increased, which shows that the surface modification effect of the trimethylchlorosilane on the Kevlar fiber becomes better with the increase of the treatment time.
(2) Scanning Electron Microscope (SEM) analysis
SEM images of the surface of the Kevlar fiber after being modified for 12 hours by trimethylchlorosilane are shown in figure 2a and figure 2 b. It can be seen from the figure that a layer of substance is adhered on the surface of the Kevlar fiber, the surface becomes rough, and the specific surface area is increased. The small particles may be SiO formed by the oxidative decomposition of trimethylsilyl on the Kevlar surface2. This process occurs during the Kevlar fiber modification process and the drying process.
The mapping chart of the Kevlar fiber after trimethylchlorosilane modification (treatment for 12h) is shown in FIG. 3. In FIG. 3, carbon is shown at the top left, oxygen is shown at the top right, nitrogen is shown at the bottom left, and silicon is shown at the bottom right.
As can be seen from the figure, Si element appears on the surface of the Kevlar fiber after modification, and the modification of the Kevlar fiber by the trimethylchlorosilane is proved to be effective.
(3) Infrared (FT-IR) analysis
The characteristic frequency of the modified Kevlar fiber is 1303cm-1-1105cm-1A new peak appears between the two peaks, and the characteristic frequency is 1261.28cm-1. The peak is a characteristic peak of a C-O bond, and proves that polymerization of dopamine occurs on the Kevlar surface, and poly-dopamine is formed and adhered to the surface of Kevlar fiber.
(4) AFM analysis
As can be seen from the figure, the surface roughness of the Kevlar fiber modified by the trimethylchlorosilane is improved. The surface roughness of the Kevlar fiber before modification is 20.6%, the surface roughness of the Kevlar fiber after modification is 26.2%, the surface roughness of the Kevlar fiber after modification by trimethylchlorosilane is improved by about 5.6%, and the modification effect is good.
(5) X-ray photoelectron spectroscopy (XPS)
The modified Kevlar fiber is subjected to X-ray photoelectron spectroscopy analysis, and Si peaks of 100eV and 160eV show that Si exists in a C-Si-N, C-Si form, which shows that trimethylchlorosilane is effective in modifying the Kevlar fiber. In the elemental content analysis, it is found that the content of Si cannot be detected because the content of Si is low and the kevlar fiber is different from a crystal, and a large error occurs in the detection.
(6) X-ray energy Spectroscopy (EDS)
And (3) carrying out X-ray energy spectrum analysis on the Kevlar fiber before modification, wherein the content of C element in the Kevlar fiber before modification is 67.75%, the content of O element is 12.47%, and the content of N element is reduced by 18.75%. Compared with the Kevlar fiber before modification, the content of the C element in the Kevlar fiber after modification is increased, and the content of the N, O element is reduced. The reason is that the trimethylchlorosilane does not contain C, N elements, and the trimethylsilyl group is introduced on the surface of the Kevlar fiber, so that the content of C elements is increased.
Example 2
Design and performance test of captive and elastic target plate
(1) Design and composition structure of bionic bullet-trapping target plate
The non-standard bullet mainly comprises a lead bullet, a steel ball and a plastic bullet. The initial velocity of these projectiles is low and kinetic energy is low compared to projectiles fired by standard guns. When a non-standard projectile hits a common bulletproof material, the projectile can be flicked off, because the bulletproof material has high surface hardness and the low-speed and low-kinetic energy projectile cannot puncture the bulletproof material. The three types of non-standard shot are shown in figure 4, wherein a lead shot, a steel ball and a plastic shot are sequentially arranged from left to right in the figure.
In order to ensure that the three types of bullets cannot be punctured when the bullet trapping target plate traps the three types of bullets, the elastic surface (front surface) of the bullet trapping target plate is made of polyurethane foam material, and the back plate is made of Kevlar fiber reinforced resin so that the bullet trapping target plate cannot be punctured by the three types of bullets. Because of the speed difference between the three types of the shot and the different kinetic energy after the shot is shot out of the muzzle, the kinetic energy of the plastic shot is the smallest and the plastic shot is most easily shot away. Therefore, the first layer of the bullet-trapping target plate adopts polyurethane soft foam; polyurethane rigid foam with the hardness increasing continuously is adopted in the second layer to the sixth layer; and the seventh layer adopts Kevlar fiber reinforced resin. The seven layers of materials are bonded together through thermosetting resin to form the bullet-trapping target plate. The target plate is square, 250mm in side length and 135mm in thickness. The final captured target plate is shown in fig. 5a and 5 b.
The thickness of seven layers of materials of the bullet-trapping target plate is as follows: the first layer is 25mm, the second layer is 6mm, the third layer is 30mm, the fourth layer is 18mm, the fifth layer is 30mm, the sixth layer is 20mm, and the seventh layer (fiber reinforced resin) is 6 mm.
(2) Video microscopy analysis of polyurethane foams
The six-layer polyurethane foam used to make the captive target panel is shown in figures 6a to 6 f. Under a video microscope, the polyurethane material has a plurality of air holes, and the air hole densities of the polyurethane materials with different hardness are greatly different. Of the six polyurethane materials, the lowest hardness design is the first layer (the ballistic surface), and the six polyurethane foam materials are bonded together in order of increasing hardness to form the polyurethane layer.
(3) Video microscope analysis of Kevlar fiber reinforced resin (backplane)
A video microscope image of the Kevlar reinforced resin (backsheet) is shown in FIG. 7. The fiber is used as a reinforcing material, the epoxy resin is used as a matrix, the Kevlar fiber is embedded into the epoxy resin, the reinforcing and supporting effects on the whole composite board are achieved like a steel bar in cement, and the strength of the composite board is improved by multiple times compared with that of a pure epoxy resin board.
(4) Design of target practice experiment of bionic captive and elastic material
In order to verify the bullet trapping effect and the bulletproof performance of the bullet trapping target plate, a target shooting experiment is designed. Fixing the target plate for trapping the shots, placing an air gun at a position 50m away from the target plate, and launching the three shots at a certain initial speed. And shooting the picture of the shot into the target plate by using a high-speed camera, and observing and recording the number of layers of the shot penetrating through the target plate.
Theoretically, the plastic bullet can be captured by the first layer or the second layer of the bullet-capturing target plate, and the steel balls can break through six layers of polyurethane foam at most and stay on the surface of the fiber reinforced resin. The lead bomb has larger kinetic energy, can puncture the polyurethane layer and be embedded into the Kevlar reinforced resin layer, but can not puncture the bomb target plate. The target plate after being subjected to the nonstandard shot is shown in fig. 8. In the figure, after the plastic bullet hits the target plate, a part of the plastic bullet is embedded in the first layer of the target plate, and a part of the plastic bullet breaks through the first layer and stays on the second polyurethane layer. When the lead bullets are used for shooting the bullet-trapping target plate, larger bullet holes can be left on the polyurethane layer of the target plate, but the target plate is not punctured.
Different types of projectiles have different damage degrees to the target plate, different types of non-standard projectiles are used for carrying out shooting tests on the target plate, and the relative magnitude of the power of the different types of projectiles can be determined by comparing the damage degrees of the target plate, so that a unified standard is formulated to carry out standardized identification on the killing power of the non-standard projectiles.
Claims (7)
1. The preparation method of the surface modified Kevlar fiber is characterized by comprising the following steps:
(1) firstly, cutting Kevlar fiber into fiber sections;
(2) dichloromethane is used as a solvent, trimethylchlorosilane is used as a modification reagent, and the dichloromethane and the sheared Kevlar fiber are stirred in a water bath;
(3) and (3) after stirring in a water bath, standing for 30min at room temperature, washing for 5 times by using dichloromethane, and drying for 6h in an infrared drying oven to completely volatilize the residual solvent on the surface of the fiber to obtain the surface modified Kevlar fiber.
2. The method for preparing the surface-modified Kevlar fiber according to claim 1, wherein the step (1) is to cut the Kevlar fiber into fiber segments of 3mm in length.
3. The preparation method of the surface modified Kevlar fiber according to claim 1, wherein the step (2) is carried out in water bath at 35 ℃, the rotating speed of a stirring rotor is 310r/min, and the stirring time is 4-12 h.
4. Surface-modified Kevlar fiber, characterized in that it is obtainable by the process according to any one of claims 1 to 3.
5. Use of the surface-modified Kevlar fiber according to claim 4 as a material for the preparation of biomimetic captive bullets.
6. A bionic capture bomb material is characterized by comprising a front face and a back plate, wherein the front face is made of polyurethane foam material, the back plate is made of Kevlar fiber reinforced resin, and the Kevlar fiber reinforced resin is composed of the surface modified Kevlar fiber and resin in claim 4.
7. The bionic capture and elastic material of claim 6, wherein the front face comprises six layers, namely a first layer of soft polyurethane foam, and from the second layer to the sixth layer of hard polyurethane foam with the hardness increasing continuously; the seventh layer is a back plate, Kevlar fiber reinforced resin is adopted, and the seven layers of materials are bonded together through thermosetting resin.
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| CN106592220A (en) * | 2016-12-24 | 2017-04-26 | 中国科学技术大学 | Aramid fiber surface modification method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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