CN114892404B - Method for improving surface wettability of ultra-high molecular weight polyethylene fiber - Google Patents

Method for improving surface wettability of ultra-high molecular weight polyethylene fiber Download PDF

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CN114892404B
CN114892404B CN202210573067.9A CN202210573067A CN114892404B CN 114892404 B CN114892404 B CN 114892404B CN 202210573067 A CN202210573067 A CN 202210573067A CN 114892404 B CN114892404 B CN 114892404B
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molecular weight
weight polyethylene
ultra
high molecular
polyethylene fiber
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CN114892404A (en
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张中威
熊自明
吴凡
杨晓宁
孙慜倩
林渊
夏一鹭
姚瑶
李�杰
王明洋
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Army Engineering University of PLA
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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
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    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/02—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements ultrasonic or sonic; Corona discharge
    • D06M10/025—Corona discharge or low temperature plasma
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    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/04—Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/08—Organic compounds
    • D06M10/10—Macromolecular compounds
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    • 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
    • D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
    • D06M13/325—Amines
    • D06M13/328—Amines the amino group being bound to an acyclic or cycloaliphatic carbon atom
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    • 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
    • D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M2101/20—Polyalkenes, polymers or copolymers of compounds with alkenyl groups bonded to aromatic groups
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a method for improving the surface wettability of an ultra-high molecular weight polyethylene fiber in the technical field of fiber surface modification, and aims to solve the problems that single modification methods for UHMWPE fiber have respective defects and the like in the prior art. The invention improves the ultra-high molecular weight polyethylene fiber through the low-temperature plasma-polypyrrole grafting synergy, overcomes the defect of adopting a single surface modification method, and is beneficial to long-term preservation of fiber surface activity.

Description

Method for improving surface wettability of ultra-high molecular weight polyethylene fiber
Technical Field
The invention relates to a method for improving the surface wettability of ultra-high molecular weight polyethylene fibers, belonging to the technical field of fiber surface modification.
Background
Ultra-high molecular weight polyethylene (UHMWPE) fibers have the advantages of low density, high strength, impact resistance, corrosion resistance and the like, and play an important role in the fields of individual body armor, bulletproof helmets, armament armor protection of main warfare equipment, civil labor protection and the like. However, the surface of the UHMWPE fiber which is not subjected to surface treatment is smooth, and the polar groups are lack, so that the UHMWPE fiber has strong inertia, is difficult to form good interface action with the resin matrix, and the overall performance of the UHMWPE fiber reinforced composite material is seriously restricted from being improved, so that the infiltration performance of the UHMWPE fiber and the resin matrix is required to be improved through surface treatment, and the interface bonding strength is further improved.
At present, a plurality of fiber surface modification methods are mainly divided into two types, namely a chemical method and a physical method. The chemical method mainly comprises a strong acid oxidation method, a grafting method, a coupling agent modification method and the like, and can effectively improve the surface activity of the fiber, but has larger damage to the fiber body and does not belong to an environment-friendly technology; the fiber surface activity after modification by physical methods such as irradiation, ray treatment and the like generally decays fast, the fiber body performance can be damaged to a certain extent, and the safety protection requirement of the working environment is high.
The plasma treatment method can not only clean and etch the surface of the fiber and increase the surface roughness, but also change the chemical structure of the surface of the fiber and introduce new free radicals by ionizing the fiber in different atmospheres, thereby achieving the effects of improving the adhesive force of the fiber and the matrix and enhancing the shear strength of the interface. However, the surface activity of the UHMWPE fiber after plasma modification has a short preservation time, and tends to be reduced to a level before modification within several hours, and the strength of the fiber body is damaged to some extent.
Polypyrrole (PPy) is a common conductive polymer, belongs to a heterocyclic conjugated conductive polymer material, has the advantages of light weight, good stability, simple preparation process, economy, environmental protection and the like, and is widely used for super capacitors, electrode materials, conductive polymer composite materials and the like. If PPy can be grafted on the surface of UHMWPE fiber, the surface wettability of the UHMWPE fiber is hopeful to be endowed, the surface activity of the fiber can be preserved for a long time, and the comprehensive properties of mechanics, electric conduction, heat and the like of the fiber material are improved, but the surface activity of the UHMWPE fiber is poor, so that the PPy is difficult to directly realize effective grafting.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for improving the surface wettability of an ultra-high molecular weight polyethylene fiber, which improves the ultra-high molecular weight polyethylene fiber through the cooperation of low-temperature plasma-polypyrrole grafting, overcomes the defect of adopting a single surface modification method and is beneficial to long-term preservation of the surface activity of the fiber.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: the method for improving the surface wettability of the ultra-high molecular weight polyethylene fiber comprises the following steps:
s1, performing plasma treatment on ultra-high molecular weight polyethylene fibers, wherein the air pressure is 500-3000 Pa, the power is 100-350W, and the treatment time is 5-10 min;
s2, placing the treated ultra-high molecular weight polyethylene fibers into a mixed aqueous solution of trihydroxy aminomethane and dopamine hydrochloride, stirring for 30-60 min, and taking out;
s3, placing the ultra-high molecular weight polyethylene fiber obtained in the step S2 into an aqueous pyrrole solution, stirring for 10-30 min, then carrying out ice bath, slowly and uniformly dripping an ammonium persulfate solution, and continuously stirring for 10-30 min;
s4, soaking the ultrahigh molecular weight polyethylene fiber sample obtained in the step S3 in deionized water for 2-6 hours, taking out and drying to obtain the UHMWPE fiber with improved surface wettability.
Further, the atmosphere used in the plasma treatment in step S1 is a mixed gas of oxygen and nitrogen, wherein the oxygen volume ratio is 40 to 60Vol%.
Further, the reaction electrodes for plasma treatment are a pair of cylindrical electrodes, and the distance between the polar plates of the cylindrical electrodes is 20-50 mm.
Further, in the step S2, the pH range of the mixed aqueous solution of the trihydroxy aminomethane and the dopamine hydrochloride is 8.0-10.5, the stirring method adopts magnetic stirring, and the magnetic stirring has a magnetor rotating speed range of 300-500 rpm.
Further, in the step S3, the concentration of the pyrrole aqueous solution is 10-30 wt%, and the concentration of the ammonium persulfate solution is 15-40 wt%.
Further, in the step S3, magnetic stirring is adopted for the stirring method, and the rotating speed of the magnetic seeds for magnetic stirring is 500-800 rpm.
Further, in the step S4, the drying temperature is 60-80 ℃ and the drying time is 1-6 h.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, firstly, the surface of the ultra-high molecular weight polyethylene fiber is etched through plasma treatment, and active groups are introduced, so that the surface infiltration performance of the fiber and the resin matrix is improved, and the load transfer capacity at the interface of the fiber/the matrix is improved, thereby improving the mechanical property of the ultra-high molecular weight polyethylene fiber reinforced composite material.
And then introducing dopamine as a carrier, and grafting polypyrrole to the surface of the ultra-high molecular weight polyethylene fiber in batches. The grafted polypyrrole is polymerized in situ at microscopic cracks and defects of the fiber to form a bridging effect, so that the damage of the ultra-high molecular weight polyethylene fiber body caused by plasma treatment is reinforced to a certain extent, and therefore, the surface of the ultra-high molecular weight polyethylene fiber after the plasma treatment is provided with groups and a protective film layer with more stable performance, which are beneficial to long-term preservation of the surface activity of the fiber after modification.
Drawings
FIG. 1 is a schematic process flow diagram of a method for improving the surface wettability of ultra-high molecular weight polyethylene fibers according to an embodiment of the invention;
fig. 2 is a schematic diagram of SEM scanning electron microscope of morphology before and after surface treatment of an ultra-high molecular weight polyethylene fiber according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
Example 1:
as shown in fig. 1, the method for improving the surface wettability of the ultra-high molecular weight polyethylene fiber provided by the embodiment of the invention comprises the following steps:
s1, carrying out plasma treatment on ultra-high molecular weight polyethylene fibers, wherein the treatment atmosphere of the plasma treatment is mixed gas of oxygen and nitrogen, the gas volume ratio of the oxygen to the nitrogen is 5:5, the reaction electrodes are a pair of cylindrical electrodes, the distance between the electrode plates is 30mm, the air pressure is 500Pa, the power is 350W, and the treatment time is 5min;
s2, placing the treated ultra-high molecular weight polyethylene fibers into a mixed aqueous solution of trihydroxy aminomethane and dopamine hydrochloride, wherein the pH value of the mixed aqueous solution is 9.0, stirring for 30min, and taking out;
s3, placing the ultra-high molecular weight polyethylene fiber obtained in the step S2 into an aqueous solution of pyrrole with the concentration of 10wt%, stirring for 20min, then carrying out ice bath, slowly and uniformly dripping an ammonium persulfate solution with the concentration of 15wt%, and continuously stirring for 20min;
s4, soaking the ultrahigh molecular weight polyethylene fiber sample obtained in the step S3 in deionized water for 2 hours, taking out, and drying at 60 ℃ for 1 hour to obtain the ultrahigh molecular weight polyethylene fiber with improved surface wettability.
Example 2:
the method for improving the surface wettability of the ultra-high molecular weight polyethylene fiber of the embodiment comprises the following steps:
s1, performing plasma treatment on ultra-high molecular weight polyethylene fibers, wherein the treatment atmosphere of the plasma treatment is mixed gas of oxygen and nitrogen, the gas volume ratio of the oxygen to the nitrogen is 8:2, the positions of reaction electrodes are a pair of cylindrical electrodes, the distance between electrode plates is 40mm, the air pressure is 1000Pa, the power is 350W, and the treatment time is 5min;
s2, putting the treated ultra-high molecular weight polyethylene fibers into a mixed aqueous solution of trihydroxy aminomethane and dopamine hydrochloride, wherein the pH value of the mixed aqueous solution is 10.5, stirring for 30min, and taking out;
s3, placing the ultra-high molecular weight polyethylene fiber obtained in the step S2 into an aqueous solution of pyrrole with the concentration of 20wt%, stirring for 20min, then carrying out ice bath, slowly and uniformly dripping an ammonium persulfate solution with the concentration of 20wt%, and continuously stirring for 20min;
s4, soaking the ultrahigh molecular weight polyethylene fiber sample obtained in the step S3 in deionized water for 2 hours, taking out, and drying at 60 ℃ for 1 hour to obtain the ultrahigh molecular weight polyethylene fiber with improved surface wettability.
Example 3:
the method for improving the surface wettability of the ultra-high molecular weight polyethylene fiber of the embodiment comprises the following steps:
s1, performing plasma treatment on ultra-high molecular weight polyethylene fibers, wherein the treatment atmosphere of the plasma treatment is pure nitrogen, the positions of reaction electrodes are a pair of cylindrical electrodes, the distance between electrode plates is 50mm, the air pressure is 2000Pa, the power is 350W, and the treatment time is 5min;
s2, placing the treated ultra-high molecular weight polyethylene fibers into a mixed aqueous solution of trihydroxy aminomethane and dopamine hydrochloride, wherein the pH value of the mixed aqueous solution is 8.0, stirring for 30min, and taking out;
s3, placing the ultra-high molecular weight polyethylene fiber obtained in the step S2 into an aqueous solution of pyrrole with the concentration of 30wt%, stirring for 20min, then carrying out ice bath, slowly and uniformly dripping an ammonium persulfate solution with the concentration of 30wt%, and continuously stirring for 20min;
s4, soaking the ultrahigh molecular weight polyethylene fiber sample obtained in the step S3 in deionized water for 2 hours, taking out, and drying at 60 ℃ for 1 hour to obtain the ultrahigh molecular weight polyethylene fiber with improved surface wettability.
Example 4:
the method for improving the surface wettability of the ultra-high molecular weight polyethylene fiber of the embodiment comprises the following steps:
s1, performing plasma treatment on ultra-high molecular weight polyethylene fibers, wherein the treatment atmosphere of the plasma treatment is pure oxygen, the positions of reaction electrodes are a pair of cylindrical electrodes, the distance between electrode plates is 50mm, the air pressure is 3000Pa, the power is 350W, and the treatment time is 5min;
s2, putting the treated ultra-high molecular weight polyethylene fibers into a mixed aqueous solution of trihydroxy aminomethane and dopamine hydrochloride, wherein the pH value of the mixed aqueous solution is 10.5, stirring for 30min, and taking out;
s3, placing the ultra-high molecular weight polyethylene fiber obtained in the step S2 into an aqueous solution of pyrrole with the concentration of 30wt%, stirring for 20min, then carrying out ice bath, slowly and uniformly dripping an ammonium persulfate solution with the concentration of 40wt%, and continuously stirring for 20min;
s4, soaking the ultrahigh molecular weight polyethylene fiber sample obtained in the step S3 in deionized water for 2 hours, taking out, and drying at 60 ℃ for 1 hour to obtain the ultrahigh molecular weight polyethylene fiber with improved surface wettability.
Comparative example 1:
the ultra-high molecular weight polyethylene fiber is taken out after being soaked in deionized water for 2 hours, and is dried for 1 hour at the temperature of 60 ℃.
Comparative example 2:
s1, performing plasma treatment on ultra-high molecular weight polyethylene fibers, wherein the treatment atmosphere of the plasma treatment is mixed gas of oxygen and nitrogen, the gas volume ratio of the oxygen to the nitrogen is 5:5, the positions of reaction electrodes are a pair of cylindrical electrodes, the distance between electrode plates is 30mm, the air pressure is 500Pa, the power is 350W, and the treatment time is 5min;
s2, soaking the obtained ultra-high molecular weight polyethylene fiber sample in deionized water for 2 hours, taking out, and drying at 60 ℃ for 1 hour.
Comparative example 3:
s1, putting the treated ultra-high molecular weight polyethylene fiber into a mixed aqueous solution of trihydroxy aminomethane and dopamine hydrochloride, wherein the pH value of the mixed aqueous solution is 9.0, stirring for 30min, and taking out;
s2, placing the ultra-high molecular weight polyethylene fiber obtained in the step S1 into an aqueous solution of pyrrole with the concentration of 10wt%, stirring for 20min, then carrying out ice bath, slowly and uniformly dripping an ammonium persulfate solution with the concentration of 15wt%, and continuously stirring for 20min;
s3, soaking the ultrahigh molecular weight polyethylene fiber sample obtained in the step S2 in deionized water for 2 hours, taking out, and drying at 60 ℃ for 1 hour.
The ultra high molecular weight polyethylene fiber properties obtained in the examples and comparative examples of the present invention will be analyzed with reference to the accompanying drawings and tables.
First, the morphology of the ultra-high molecular weight polyethylene fibers before and after the treatment was compared.
Comparison results: as can be seen from the SEM scan of fig. 2, there is damage to the bulk of the ultra-high molecular weight polyethylene fiber that has not been synergistically improved by low temperature plasma-polypyrrole grafting, which results in a faster decay of the fiber surface activity.
In contrast, after the ultra-high molecular weight polyethylene fiber is subjected to low-temperature plasma-polypyrrole grafting synergistic improvement, grafted polypyrrole is polymerized in situ at microscopic cracks and defects of the fiber to form a bridging effect, so that the damage of an ultra-high molecular weight polyethylene fiber body caused by plasma treatment is reinforced to a certain extent, and groups and a protective film layer with more stable performance are formed on the surface of the ultra-high molecular weight polyethylene fiber after the plasma treatment, thereby being beneficial to long-term preservation of the surface activity of the modified fiber.
Next, the ultra-high molecular weight polyethylene fibers obtained in examples 1 to 4 and comparative examples 1 to 3 were analyzed for interfacial shear strength (IFSS), retention of filament strength, and contact angle, respectively.
Interfacial shear strength (IFSS) was measured using microsphere debonding as follows:
s1, fixing an ultra-high molecular weight polyethylene fiber monofilament on a fixture frame by using double faced adhesive tape;
s2, dipping a small amount of prepared resin-curing agent system (the mass ratio is 100:30) by using a fine needle, and uniformly coating the resin-curing agent system on the surface of the monofilament to form resin microdroplets;
s3, curing and forming according to the curing technological parameters of the composite material to obtain a microsphere debonding test sample;
s4, testing the microsphere debonding test sample on a drawing tester (YG 163 of the Winz high detection instruments Co., ltd.) at a loading speed of 0.2 mm/min.
The retention of filament strength was measured using a FAVIMAT+ fiber tester and performed according to standard GB/T31290-2014, stretching rate was 2.0mm/min.
Contact angle was measured at room temperature using a contact angle meter (su Mingyu technologies Co., ltd.) and calculated according to the following formula:
θ/2＝tan -1 (2h/w)
where h is the height of the fiber surface droplet, w is the width of the fiber surface droplet, and θ is the contact angle.
Test results:
TABLE 1 fiber IFSS Strength and filament Strength Retention Rate before and after surface treatment for each example and comparative example
Figure BDA0003661035300000091
As shown in Table 1, the ultra high molecular weight polyethylene fibers IFSS strength and filament strength retention of examples 1-4, which were subjected to plasma treatment and surface post-treatment, were significantly higher than those of comparative examples 1-3 (the filament strength retention was not compared since the fibers of comparative example 1 were not subjected to surface treatment). Comparing comparative examples 1 to 3, it can be seen that the ultra high molecular weight polyethylene fiber IFSS of comparative example 1, which was not subjected to the plasma treatment and the surface post-treatment, had the lowest strength, and the ultra high molecular weight polyethylene fiber IFSS and filament strength retention of comparative example 2, which was subjected to the plasma treatment, were lower than those of comparative example 3, which was subjected to the surface post-treatment.
Also, as shown in example 1, the interfacial shear strength (IFSS) of the modified UHMWPE fibers with the epoxy resin was maximized by 357%, while the bulk strength of the fibers was only slightly reduced by about 5% from that before modification.
Table 2 contact angle measurements for each example and comparative example
Figure BDA0003661035300000101
As can be seen from table 2, the contact angle of the ultra-high molecular weight polyethylene fiber synergistically improved by low temperature plasma-polypyrrole grafting is far smaller than that of the ultra-high molecular weight polyethylene fiber which is not subjected to surface treatment or is subjected to single surface treatment, and the surface wettability of the ultra-high molecular weight polyethylene fiber and the resin matrix synergistically improved by low temperature plasma-polypyrrole grafting is superior.
In conclusion, the ultrahigh molecular weight polyethylene fiber synergistically improved by low-temperature plasma-polypyrrole grafting has less damage to the fiber body, the surface wettability of the fiber and the resin matrix is greatly improved, and the load transmission capacity at the interface of the fiber and the matrix is improved, so that the mechanical property of the ultrahigh molecular weight polyethylene fiber reinforced composite material is improved.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.

Claims (5)

1. A method for improving the surface wettability of ultra-high molecular weight polyethylene fiber is characterized in that: the method comprises the following steps:
s1, performing plasma treatment on ultra-high molecular weight polyethylene fibers, wherein the air pressure is 500-3000 Pa, the power is 100-350W, and the treatment time is 5-10 min;
s2, placing the treated ultra-high molecular weight polyethylene fiber into a mixed aqueous solution of the trihydroxy aminomethane and the dopamine hydrochloride, stirring for 30-60 min, and taking out, wherein the pH range of the mixed aqueous solution of the trihydroxy aminomethane and the dopamine hydrochloride is 8.0-10.5, the stirring method adopts magnetic stirring, and the magnetic stirring has a magneton rotating speed range of 300-500 rpm;
s3, placing the ultra-high molecular weight polyethylene fiber obtained in the step S2 into an aqueous pyrrole solution, stirring for 10-30 min, then carrying out ice bath, slowly and uniformly dripping an ammonium persulfate solution, and continuously stirring for 10-30 min, wherein the concentration of the aqueous pyrrole solution is 10-30 wt%, and the concentration of the ammonium persulfate solution is 15-40 wt%;
s4, soaking the ultrahigh molecular weight polyethylene fiber sample obtained in the step S3 in deionized water for 2-6 hours, taking out and drying to obtain the ultrahigh molecular weight polyethylene fiber with improved surface infiltration performance.
2. The method for improving the surface wettability of the ultra-high molecular weight polyethylene fiber according to claim 1, wherein the method comprises the following steps: the atmosphere used for the plasma treatment in step S1 is a mixed gas of oxygen and nitrogen, wherein the oxygen volume ratio is 40 to 60Vol%.
3. The method for improving the surface wettability of the ultra-high molecular weight polyethylene fiber according to claim 2, wherein the method comprises the following steps: the reaction electrodes for plasma treatment are a pair of cylindrical electrodes, and the distance between the polar plates of the cylindrical electrodes is 20-50 mm.
4. The method for improving the surface wettability of the ultra-high molecular weight polyethylene fiber according to claim 1, wherein the method comprises the following steps: and (3) the stirring methods in the step (S3) are all magnetic stirring, wherein the rotating speed range of a magnetic seed for the magnetic stirring is 500-800 rpm.
5. The method for improving the surface wettability of the ultra-high molecular weight polyethylene fiber according to claim 1, wherein the method comprises the following steps: and in the step S4, the drying temperature is 60-80 ℃ and the drying time is 1-6 h.
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CN108330692A (en) * 2018-03-09 2018-07-27 天津工业大学 A kind of superhigh molecular weight polyethylene fibers substep is modified and its composite material and preparation method thereof
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