CN110820349A - Method for modifying polytetrafluoroethylene-aramid fiber blended fabric by combining dopamine-polyethyleneimine-nanoparticles - Google Patents
Method for modifying polytetrafluoroethylene-aramid fiber blended fabric by combining dopamine-polyethyleneimine-nanoparticles Download PDFInfo
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- CN110820349A CN110820349A CN201911138302.4A CN201911138302A CN110820349A CN 110820349 A CN110820349 A CN 110820349A CN 201911138302 A CN201911138302 A CN 201911138302A CN 110820349 A CN110820349 A CN 110820349A
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- blended fabric
- polytetrafluoroethylene
- polyethyleneimine
- dopamine
- aramid
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- 239000004744 fabric Substances 0.000 title claims abstract description 102
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229920006231 aramid fiber Polymers 0.000 title claims abstract description 23
- 239000004760 aramid Substances 0.000 claims abstract description 35
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 32
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 22
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229960001149 dopamine hydrochloride Drugs 0.000 claims abstract description 17
- 229920002873 Polyethylenimine Polymers 0.000 claims abstract description 16
- 239000007853 buffer solution Substances 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- FYFFGSSZFBZTAH-UHFFFAOYSA-N methylaminomethanetriol Chemical compound CNC(O)(O)O FYFFGSSZFBZTAH-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 239000008367 deionised water Substances 0.000 claims abstract description 7
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000002041 carbon nanotube Substances 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
- 239000011787 zinc oxide Substances 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 claims description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 2
- 239000005751 Copper oxide Substances 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 229910026551 ZrC Inorganic materials 0.000 claims description 2
- JXOOCQBAIRXOGG-UHFFFAOYSA-N [B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[Al] Chemical compound [B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[Al] JXOOCQBAIRXOGG-UHFFFAOYSA-N 0.000 claims description 2
- OTCHGXYCWNXDOA-UHFFFAOYSA-N [C].[Zr] Chemical compound [C].[Zr] OTCHGXYCWNXDOA-UHFFFAOYSA-N 0.000 claims description 2
- 229910000431 copper oxide Inorganic materials 0.000 claims description 2
- 229910021389 graphene Inorganic materials 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 2
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 21
- 239000011159 matrix material Substances 0.000 abstract description 16
- 239000011248 coating agent Substances 0.000 abstract description 11
- 238000000576 coating method Methods 0.000 abstract description 11
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 abstract description 4
- 239000005011 phenolic resin Substances 0.000 abstract description 4
- 229920001568 phenolic resin Polymers 0.000 abstract description 4
- 230000003746 surface roughness Effects 0.000 abstract description 4
- 125000000524 functional group Chemical group 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000011347 resin Substances 0.000 description 17
- 229920005989 resin Polymers 0.000 description 17
- 239000002131 composite material Substances 0.000 description 14
- 230000004048 modification Effects 0.000 description 13
- 238000012986 modification Methods 0.000 description 13
- 238000002715 modification method Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 6
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229960003638 dopamine Drugs 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011151 fibre-reinforced plastic Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000005543 nano-size silicon particle Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- 238000006845 Michael addition reaction Methods 0.000 description 1
- 239000002262 Schiff base Substances 0.000 description 1
- 150000004753 Schiff bases Chemical class 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002121 nanofiber Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/61—Polyamines polyimines
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- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/0666—Polycondensates containing five-membered rings, condensed with other rings, with nitrogen atoms as the only ring hetero atoms
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Abstract
The invention discloses a method for modifying a polytetrafluoroethylene-aramid fiber blended fabric by combining dopamine-polyethyleneimine-nanoparticles, which comprises the steps of adding the polytetrafluoroethylene-aramid fiber blended fabric, dopamine hydrochloride, polyethyleneimine and nanoparticles into a trihydroxymethyl-aminomethane/hydrochloric acid buffer solution, stirring, ultrasonically dispersing uniformly, and then continuously stirring and reacting for 2-24 hours at room temperature; and after the reaction is finished, taking out the blended fabric, fully washing the blended fabric by using deionized water to remove unreacted impurities on the surface, and drying the fabric in a vacuum oven to obtain the surface modified polytetrafluoroethylene-aramid blended fabric. The surface of the fiber is modified by the method to form an organic-inorganic hybrid functional coating, so that active functional groups and larger surface roughness are introduced into the surface of the blended fabric, and the interfacial adhesion performance between the blended fabric and a phenolic resin matrix can be improved through chemical bonding and mechanical interlocking.
Description
Technical Field
The invention relates to a surface modification method of a polytetrafluoroethylene-aramid fiber blended fabric, in particular to a method for jointly modifying the polytetrafluoroethylene-aramid fiber blended fabric by dopamine-polyethyleneimine-nanoparticles, and belongs to the technical field of surface modification of nano materials and fibers.
Background
The fiber reinforced polymer matrix composite has the advantages of light weight, high strength, outstanding fatigue resistance, corrosion resistance, excellent designability and the like, so the fiber reinforced polymer matrix composite is widely applied to the high-end manufacturing fields of aerospace, automobiles, weaponry and the like. In the blended fabric, because different types of fibers are introduced in the weaving process, the blended fabric has the advantages and properties of different fibers, and therefore, the blended fabric draws more and more attention of researchers. At present, a blended fabric material formed by mixing and weaving polytetrafluoroethylene fibers serving as a lubricating phase and aramid fibers is considered as an ideal material of a bearing pad due to the combination of the excellent lubricating property of the polytetrafluoroethylene fibers and the high specific strength of the aramid fibers. However, both polytetrafluoroethylene and aramid fibers have relatively smooth surfaces and lack reactive groups, and thus interfacial adhesion to the resin matrix can only be relied upon by weak van der waals forces. The weak fiber/resin interface adhesion performance prevents external stress on the resin matrix from being effectively transferred to the fabric reinforcing phase, thereby forming stress concentration at the interface and damaging the structural integrity of the composite material. In particular, in the friction process, stress-induced micro-cracks at the interface are expanded to the surface of the resin, the resin matrix begins to peel off under the action of shear stress and pressure stress, and the reinforcing fibers in the resin matrix are cut off and pulled out, so that the application range and the service life of the gasket material are greatly limited. Therefore, modifying the surface of the polytetrafluoroethylene-aramid blended fabric, introducing active functional groups on the surface of the fiber or constructing larger surface roughness so as to improve the interface adhesion performance of the fabric and the phenolic resin matrix is very important.
In recent years, the interface performance of the fiber and the resin matrix is greatly concerned by the rapid development of the composite material technology, and various surface modification technologies are applied to the improvement of the interface performance, including chemical vapor deposition, physical vapor deposition, plasma etching, high-energy radiation, chemical grafting, adhesive coating and the like. However, most of these modification methods involve expensive experimental equipment, complicated reaction conditions or high reaction temperature, and thus it is necessary to find a simple and mild method for modifying the fiber surface. In addition, because the surface characteristics of the polytetrafluoroethylene fiber and the aramid fiber are different, the modification method used is required to be simultaneously suitable for the two different fibers, and the original mechanical strength of the fibers is also required to be maintained, which provides great challenges for the conventional fiber modification method.
Disclosure of Invention
The invention aims to provide a method for modifying a polytetrafluoroethylene-aramid fiber blended fabric by combining dopamine-polyethyleneimine-nanoparticles so as to optimize the interfacial adhesion performance of the polytetrafluoroethylene-aramid fiber blended fabric and a phenolic resin-based composite material.
Surface modification method for polytetrafluoroethylene-aramid fiber blended fabric
The method for modifying the polytetrafluoroethylene-aramid fiber blended fabric by combining the dopamine-polyethyleneimine-nanoparticles comprises the steps of adding the polytetrafluoroethylene-aramid fiber blended fabric, dopamine hydrochloride, polyethyleneimine and nanoparticles into a trihydroxymethyl-aminomethane/hydrochloric acid buffer solution, stirring, ultrasonically dispersing uniformly, and then continuously stirring and reacting for 2-24 hours at room temperature; and after the reaction is finished, taking out the blended fabric, fully washing the blended fabric by using deionized water to remove unreacted impurities on the surface, and drying the fabric in a vacuum oven to obtain the surface modified polytetrafluoroethylene-aramid blended fabric.
The pH value of the trihydroxymethyl-aminomethane/hydrochloric acid buffer solution is 6-10. In a trihydroxymethyl-aminomethane/hydrochloric acid buffer solution, the concentration of the dopamine hydrochloride is 1-3 mg/ml.
The polydopamine formed by oxidative autopolymerization of the dopamine hydrochloride in the modification process has extremely strong surface adhesion performance, and can be coated on the surface of the polytetrafluoroethylene-aramid fiber blended fabric. The dosage of the dopamine hydrochloride is 0.05-0.5 time of the mass of the polytetrafluoroethylene-aramid fiber blended fabric.
The polyethyleneimine is introduced to promote the polymerization of dopamine hydrochloride, and is copolymerized with dopamine through Michael addition and Schiff base reaction, so that the polymerization rate of dopamine, and the uniformity, compactness and active group content of the obtained coating are improved. The addition amount of the polyethyleneimine is 0.1-5 times of the mass of the dopamine hydrochloride.
The introduction of the nano particles is to anchor the nano particles on the surface of the polytetrafluoroethylene-aramid fiber blended fabric by utilizing the extremely strong adhesive property of the polydopamine-polyethyleneimine hybrid coating, construct an organic-inorganic hybrid functional coating, improve the surface roughness of the modified fabric, and play a role in modulus buffering between the fabric and a resin matrix. The nano-particles are one of metal oxides (zinc oxide, aluminum oxide, titanium oxide, copper oxide, zirconium oxide and iron oxide), metal carbides (titanium carbide, tungsten carbide and zirconium carbide), metal borides (titanium boride, zirconium boride and aluminum boride), carbon nano-tubes, graphene and silicon dioxide. The dosage of the nano particles is 0.1-5 times of the mass of the dopamine hydrochloride.
Secondly, the influence of surface modification on the interface performance and the mechanical property of the fabric
1. Interfacial adhesion performance
The test method comprises the following steps: the interfacial adhesion performance test of the blended fabric composite material was performed on an electronic fabric tensile machine (YG 026D) according to GB/T2790-.
Fig. 1 shows the interfacial adhesion performance of unmodified, dopamine-polyethyleneimine codeposition modified and dopamine-polyethyleneimine-nanoparticle combined modified polytetrafluoroethylene-aramid blended fabric composite material. As shown in figure 1, after the blended fabric is jointly modified by dopamine-polyethyleneimine-nanoparticles, the interfacial adhesion performance of the composite material is greatly improved. As can be seen by observing the cross section and the peel-off surface of the fabric composite material (figure 2), the gaps between the fibers and the resin are larger and the resin peel-off surface is smoother in the cross section of the unmodified fabric composite material, which indicates that the interfacial adhesion performance of the unmodified fabric and the resin matrix is weaker. After the fiber fabric is subjected to combined modification by dopamine-polyethyleneimine-nanoparticles, the interface gap between the fiber and the resin is obviously reduced, and meanwhile, part of broken fibers remain on the resin stripping surface, so that the interface performance of the polytetrafluoroethylene-aramid fiber blended fabric composite material after the fiber fabric is subjected to combined modification is further proved to be effectively improved.
2. Tensile Properties of the blended Fabric
The test method comprises the following steps: the tensile strength of the blended fabric was also performed on an electronic fabric strengthener (YG 026D).
And testing the tensile property of the dopamine-polyethyleneimine-nanoparticle combined modified polytetrafluoroethylene-aramid blended fabric, and comparing the tensile property with that of the unmodified blended fabric. Fig. 3 shows the tensile strength of the blend fabric without modification, with dopamine-polyethyleneimine codeposition modification and dopamine-polyethyleneimine-nanoparticle combination modification. The results in fig. 3 show that the mechanical properties of the blended fabric are not significantly reduced after the blended fabric is jointly modified by dopamine-polyethyleneimine-nanoparticles.
In conclusion, the surface modification method of the polytetrafluoroethylene-aramid blended fabric provided by the invention has the following advantages:
1. according to the surface modification method of the polytetrafluoroethylene-aramid blended fabric, an organic-inorganic hybrid functional coating is constructed on the surface of the fiber, so that active functional groups and larger surface roughness can be introduced into the surface of the blended fabric simultaneously, a double promotion effect is provided for improving the interface performance of a composite material, and the damage to the mechanical property of the blended fabric is avoided;
2. according to the surface modification method of the polytetrafluoroethylene-aramid blended fabric, the construction of the organic-inorganic hybrid functional coating can be realized through one-step reaction, and the method has the characteristics of simplicity in operation, mild reaction conditions, high efficiency and the like;
3. the surface modification method of the polytetrafluoroethylene-aramid blended fabric does not have specific substrate selectivity, so that the polytetrafluoroethylene-aramid blended fabric can be deposited and coated on the surfaces of almost all fibers, and can be used for solving the problem of fiber interface adhesion in a wider range.
Drawings
Fig. 1 shows the interfacial adhesion performance of unmodified, dopamine-polyethyleneimine codeposition modified and dopamine-polyethyleneimine-nanoparticle combined modified polytetrafluoroethylene-aramid blended fabric composite material.
FIG. 2 shows the cross section and the stripping surface appearance of an unmodified, dopamine-polyethyleneimine codeposition modified and dopamine-polyethyleneimine-nanoparticle combined modified polytetrafluoroethylene-aramid blended fabric composite material.
Fig. 3 shows the tensile strength of the blend fabric without modification, with dopamine-polyethyleneimine codeposition modification and dopamine-polyethyleneimine-nanoparticle combination modification.
Detailed Description
The surface modification method and modification effect of the polytetrafluoroethylene-aramid blended fabric of the invention are further explained by the following specific examples. Wherein the interface bonding strength of the unmodified polytetrafluoroethylene-aramid fiber blended fabric and the phenolic resin matrix is 3.1N/mm; the blended fabric had a tensile strength of 608N.
Example 1
1270 mg (3 cm multiplied by 12 cm), 120 mg of dopamine hydrochloride, 120 mg of polyethyleneimine and 2 mg of carbon nano tube of the polytetrafluoroethylene-aramid blended fabric are added into 60 mL of trihydroxymethyl-aminomethane/hydrochloric acid buffer solution (pH = 8.5, 20 mmol/L), and the mixture is stirred and ultrasonically dispersed uniformly; then transferring the mixed solution into an open flask, and continuously stirring and reacting for 8 hours at room temperature; and after the reaction is finished, taking out the blended fabric, fully washing the blended fabric by using deionized water to remove unreacted impurities on the surface, and then drying the fabric in a vacuum oven for 24 hours to obtain the polydopamine-polyethyleneimine-carbon nanotube hybrid functional coating modified polytetrafluoroethylene-aramid blended fabric. The interface bonding strength of the modified polytetrafluoroethylene-aramid blended fabric and the resin matrix is 4.4 (N/mm); tensile strength is 590 (N).
Example 2
1270 mg (3 cm multiplied by 12 cm), 120 mg of dopamine hydrochloride, 120 mg of polyethyleneimine and 60 mg of silicon carbide nanoparticles are added into 60 mL of trihydroxymethyl-aminomethane/hydrochloric acid buffer solution (pH = 8.5, 20 mmol/L), and the mixture is stirred and ultrasonically dispersed uniformly; then transferring the mixed solution into an open flask, and continuously stirring and reacting for 8 hours at room temperature; and after the reaction is finished, taking out the blended fabric, fully washing the blended fabric by using deionized water to remove unreacted impurities on the surface, and then drying the blended fabric in a vacuum oven for 24 hours to obtain the polydopamine-polyethyleneimine-nano silicon carbide hybrid functional coating modified polytetrafluoroethylene-aramid blended fabric. The interface bonding strength of the modified polytetrafluoroethylene-aramid blended fabric and the resin matrix is 4.2 (N/mm); the tensile strength was 605 (N).
Example 3
1270 mg (3 cm multiplied by 12 cm), 180 mg of dopamine hydrochloride, 180 mg of polyethyleneimine and 180 mg of zinc oxide nano-particles are added into 60 mL of trihydroxymethyl-aminomethane/hydrochloric acid buffer solution (pH = 8.5, 20 mmol/L), and the mixture is stirred and ultrasonically dispersed uniformly; then transferring the mixed solution into an open flask, and continuously stirring and reacting for 12 hours at room temperature; and after the reaction is finished, taking out the blended fabric, fully washing the blended fabric by using deionized water to remove unreacted impurities on the surface, and then drying the blended fabric in a vacuum oven for 24 hours to obtain the polydopamine-polyethyleneimine-nano zinc oxide hybrid functional coating modified polytetrafluoroethylene-aramid blended fabric. The interface bonding strength of the modified polytetrafluoroethylene-aramid blended fabric and the resin matrix is 4.16 (N/mm); the tensile strength was 611 (N).
Example 4
1270 mg (3 cm multiplied by 12 cm), 60 mg of dopamine hydrochloride, 60 mg of polyethyleneimine and 30 mg of silicon dioxide nanoparticles are added into 60 mL of trihydroxymethyl-aminomethane/hydrochloric acid buffer solution (pH = 8.5, 20 mmol/L), and the mixture is stirred and ultrasonically dispersed uniformly; then transferring the mixed solution into an open flask, and continuously stirring and reacting for 4 hours at room temperature; and after the reaction is finished, taking out the blended fabric, fully washing the blended fabric by using deionized water to remove unreacted impurities on the surface, and then drying the blended fabric in a vacuum oven for 24 hours to obtain the polydopamine-polyethyleneimine-nano silicon oxide hybrid functional coating modified polytetrafluoroethylene-aramid blended fabric. The interface bonding strength of the modified polytetrafluoroethylene-aramid blended fabric and the resin matrix is 3.9 (N/mm); tensile strength was 598 (N).
Claims (10)
1. The method for modifying the polytetrafluoroethylene-aramid fiber blended fabric by combining dopamine-polyethyleneimine-nanoparticles comprises the steps of adding the polytetrafluoroethylene-aramid fiber blended fabric, dopamine hydrochloride, polyethyleneimine and nanoparticles into a trihydroxymethyl-aminomethane/hydrochloric acid buffer solution, stirring, ultrasonically dispersing uniformly, and then continuously stirring and reacting for 2-24 hours at room temperature; and after the reaction is finished, taking out the blended fabric, fully washing the blended fabric by using deionized water to remove unreacted impurities on the surface, and drying the fabric in a vacuum oven to obtain the surface modified polytetrafluoroethylene-aramid blended fabric.
2. The method for modifying a polytetrafluoroethylene-aramid blended fabric by combining dopamine-polyethyleneimine-nanoparticles according to claim 1, wherein the method comprises the following steps: the dosage of the dopamine hydrochloride is 0.05-0.5 time of the mass of the polytetrafluoroethylene-aramid fiber blended fabric.
3. The method for modifying a polytetrafluoroethylene-aramid blended fabric by combining dopamine-polyethyleneimine-nanoparticles according to claim 1, wherein the method comprises the following steps: the addition amount of the polyethyleneimine is 0.1-5 times of the mass of the dopamine hydrochloride.
4. The method for modifying a polytetrafluoroethylene-aramid blended fabric by combining dopamine-polyethyleneimine-nanoparticles according to claim 1, wherein the method comprises the following steps: the dosage of the nano particles is 0.1-5 times of the mass of the dopamine hydrochloride.
5. The method for modifying a polytetrafluoroethylene-aramid blended fabric by combining dopamine-polyethyleneimine-nanoparticles according to claim 1, wherein the method comprises the following steps: the nano-particles are one of metal oxide, metal carbide, metal boride, carbon nano-tubes, graphene and silicon dioxide.
6. The method for modifying a polytetrafluoroethylene-aramid blended fabric by combining dopamine-polyethyleneimine-nanoparticles according to claim 5, wherein the method comprises the following steps: the metal oxide is one of zinc oxide, aluminum oxide, titanium oxide, copper oxide, zirconium oxide and iron oxide.
7. The method for modifying a polytetrafluoroethylene-aramid blended fabric by combining dopamine-polyethyleneimine-nanoparticles according to claim 5, wherein the method comprises the following steps: the metal carbide is one of titanium carbide, tungsten carbide and zirconium carbide.
8. The method for modifying a polytetrafluoroethylene-aramid blended fabric by combining dopamine-polyethyleneimine-nanoparticles according to claim 5, wherein the method comprises the following steps: the metal boride is one of titanium boride, zirconium boride and aluminum boride.
9. The method for modifying the polytetrafluoroethylene-aramid blended fabric by combining the dopamine-polyethyleneimine-nanoparticles according to any one of claims 1 to 8, wherein the method comprises the following steps: in a trihydroxymethyl-aminomethane/hydrochloric acid buffer solution, the concentration of dopamine hydrochloride is 1-3 mg/mL.
10. The method for modifying the polytetrafluoroethylene-aramid blended fabric by combining the dopamine-polyethyleneimine-nanoparticles according to any one of claims 1 to 8, wherein the method comprises the following steps: the pH value of the trihydroxymethyl-aminomethane/hydrochloric acid buffer solution is 6-10.
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