A multifunctional polyester fiber based on modified graphene quantum dots and preparation method thereof

Abstract

The present invention relates to a multifunctional polyester fiber based on modified graphene quantum dots and a preparation method thereof, and belongs to the technical field of functional fibers. The preparation method of the present invention comprises the following steps: S1, under acidic conditions and the action of a catalyst, graphene quantum dots and dopamine hydrochloride react in water in the first stage, and then continue to add 1,4-phenylenediamine alcohol solution to react in the second stage to obtain modified graphene quantum dots; S2, granulating the modified graphene quantum dots and polyester powder to obtain a multifunctional polyester masterbatch; S3, spinning the multifunctional polyester masterbatch and polyester chips to obtain a multifunctional polyester fiber based on modified graphene quantum dots, the far-infrared normal emissivity of which is 0.89-0.92, the far-infrared radiation temperature rise is 2.6°C-3.3°C, the breaking strength is 3.3cN / detx-3.5cN / detx, and the volume specific resistance is not more than 1*10 8 Ω·cm.

Description

Technical Field

[0001] The invention belongs to the technical field of functional fibers, and in particular relates to a multifunctional polyester fiber based on modified graphene quantum dots and a preparation method thereof. Background Art

[0002] Polyester fiber is made of terephthalic acid or dimethyl terephthalate and ethylene glycol as raw materials, and then spun and post-processed to make polyester. It is the most widely used chemical synthetic fiber. Because of its excellent properties such as softness, affordability, and good resilience, it is widely used in furniture, car seats, cushions, bedding, toys and other fields. In recent years, multifunctional polyester fibers with far-infrared, anti-ultraviolet, magnetic, antistatic, and antibacterial properties have become the main development direction. At present, multifunctional polyester fibers are often prepared with functional additives such as graphene quantum dots and nano-ceramic powders. Graphene quantum dots are special graphene fragments with nanometer-level sizes in three dimensions, and they have the dual excellent properties of graphene and quantum dots. However, graphene quantum dots have high surface energy, poor compatibility with polyester fibers, and are easy to agglomerate in polyester fibers, resulting in difficulties in spinning and even damage to spinning equipment.

[0003] Chinese invention patent CN110079919A discloses an antibacterial cotton fiber fabric containing nano-quantum dots and a preparation method thereof. Antibacterial silver nanoparticles modified with graphene quantum dots, dissolved cotton fibers, nano-bamboo fibers, vitamin E, and glycerol are mixed evenly to obtain an electrospinning solution, and antibacterial cotton fibers are obtained by electrospinning. However, the addition of a large amount of modifiers will cause the fiber's spinnability to deteriorate and its strength performance to be greatly damaged.

[0004] Chinese invention patent CN110106576A discloses a method for preparing modified graphene polyester fiber, wherein metallic copper is crushed into copper particles, copper ions are soaked in benzotriazole to obtain modified copper ions, graphene whose surface is functionalized with sulfonic acid groups is stirred and dispersed to prepare graphene particles, and then copper-modified polyester fiber masterbatch and graphene masterbatch are melt-blended to obtain modified graphene polyester fiber. However, the introduction of anionic sulfonic acid groups cannot improve the dispersion and compatibility of graphene in polyester fibers.

[0005] Chinese invention patent CN117210967A discloses a method for preparing a skin-core structured modified graphene regenerated polyester fiber, wherein polydopamine and imidazole-based ionic liquid are used to non-covalently modify graphene oxide to obtain modified graphene; then the modified graphene and regenerated polyester are melt-spun to prepare skin-core structured modified graphene regenerated polyester fiber. However, there is no reactive group in the imidazole-based ionic liquid, and the binding performance with polydopamine is poor, which causes the imidazole-based ionic liquid to fall off easily, and the ionic liquid is adsorbed on the surface of the modified graphene, making its surface smooth and making it more difficult to mix with polyester.

[0006] Chinese invention patent CN105177753A discloses a method for preparing a military anti-melting, anti-static, high-strength, flame-retardant polyester, wherein graphene oxide is modified by p-phenylenediamine to obtain modified graphene oxide; then PET slices are mixed with a compound flame retardant, an anti-drip agent masterbatch, a phenolic antioxidant, and modified graphene oxide, and high-temperature shearing is performed to obtain a molten spinning solution; and military anti-melting, anti-static, high-strength, flame-retardant polyester is obtained by spinning. However, there are very few reactive groups on the surface of graphene oxide, and the amino group of p-phenylenediamine cannot react with graphene oxide by covalent bonds, and p-phenylenediamine does not polymerize, but is only physically adsorbed on the surface of graphene oxide, resulting in poor modification effect.

[0007] Based on the above background, it is still necessary to develop multifunctional polyester fibers based on modified graphene quantum dots. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a multifunctional polyester fiber based on modified graphene quantum dots and a preparation method thereof. Firstly, dopamine hydrochloride and 1,4-phenylenediamine are used to modify the graphene quantum dots by in-situ polymerization deposition to obtain modified polydopamine-coated graphene quantum dots, i.e., modified graphene quantum dots; then, the modified graphene quantum dots are used to prepare the multifunctional polyester fiber based on the modified graphene quantum dots by melt blending.

[0009] The first object of the present invention is to provide a method for preparing a multifunctional polyester fiber based on modified graphene quantum dots, comprising the following steps:

[0010] S1. Under acidic conditions and the action of a catalyst, graphene quantum dots and dopamine hydrochloride react in water in the first stage, and then 1,4-phenylenediamine alcohol solution is added to carry out a second stage reaction to obtain modified graphene quantum dots;

[0011] S2, granulating the modified graphene quantum dots and polyester powder described in S1 to obtain a multifunctional polyester masterbatch;

[0012] S3, spinning the multifunctional polyester masterbatch and polyester chips described in S2 to obtain the multifunctional polyester fiber based on modified graphene quantum dots.

[0013] In one embodiment of the present invention, in S1, the mass ratio of the graphene quantum dots to dopamine hydrochloride is (4-5):1, the mass ratio of dopamine hydrochloride to 1,4-phenylenediamine is 3:(1-2); the molar ratio of the catalyst to dopamine hydrochloride is 1:(1-2); the graphene quantum dots are coated with modified polydopamine, so that the surface of the graphene quantum dots is rich in organic aromatic compounds, thereby improving its compatibility with polyester fibers and its dispersibility in polyester fibers.

[0014] In one embodiment of the present invention, in S1, the catalyst is ammonium persulfate.

[0015] In one embodiment of the present invention, in S1, the pH of the acidic condition is 3-4; the acidic condition and the catalyst help promote the polymerization of dopamine, thereby improving the coating effect on the surface of graphene quantum dots.

[0016] In one embodiment of the present invention, in S1, the temperature of the first stage reaction is 40°C-50°C, and the time is 2h-3h; the time of the second stage reaction is 2h-4h; the polymerization time is short during the first stage reaction, most of the dopamine hydrochloride completes polymerization, and part of the dopamine hydrochloride is not polymerized or the degree of polymerization is low; after adding 1,4-phenylenediamine, the second stage reaction is continued to generate modified polydopamine on the surface of graphene quantum dots. On the one hand, the catechol structure in dopamine hydrochloride is easily oxidized and polymerized under the action of a catalyst to generate polydopamine. Polydopamine has high adhesion and can produce good grafting on graphene quantum dots. On the other hand, 1,4-phenylenediamine can be directly polymerized with dopamine hydrochloride, or 1,4-phenylenediamine can be polymerized with dopamine hydrochloride after self-polymerization, so that the aromatic structure of polyaniline is introduced into the polydopamine molecular chain. The polydopamine and polyaniline chain segments are interlaced and cross-linked to form polyaniline-modified polydopamine, which further improves the thermal stability of polydopamine and its compatibility with polyester fibers.

[0017] In one embodiment of the present invention, in S1, after the reaction is completed, the steps of centrifugation, washing and drying are further included; the washing is performed by using ethanol and distilled water for 1-3 times respectively.

[0018] In one embodiment of the present invention, before S2, the process further includes a step of drying the modified graphene quantum dots and the polyester powder, wherein the drying temperature of the modified graphene quantum dots is 70°C-80°C, and the time is 7h-9h; the drying temperature of the polyester powder is 120°C-130°C, and the time is 10h-12h.

[0019] In one embodiment of the present invention, in S2, the granulation is performed by melt blending, extrusion molding, cooling and pelletizing through a twin-screw extruder; the granulation temperature is 255°C-270°C; if the processing temperature is too low, the modified graphene quantum dots and polyester powder cannot be mixed evenly, which is not conducive to granulation; if the temperature is too high, it will cause energy waste.

[0020] In one embodiment of the present invention, in S2, the mass fraction of the modified graphene quantum dots in the multifunctional polyester masterbatch is 20%-25%.

[0021] In one embodiment of the present invention, before S3, the multifunctional polyester masterbatch and the polyester chips are further included in the step of drying, wherein the drying is performed by pre-crystallization at 90°C-100°C for 3h-4h, and then drying at 120°C-135°C for 10h-15h to ensure that the final moisture content of the multifunctional polyester masterbatch and the polyester chips is less than 100ppm.

[0022] In one embodiment of the present invention, in S3, the spinning is carried out by a melt spinning machine, followed by oiling, pre-stretching, winding, and stretching; the spinning process parameters are: speed of 2600m / min-2800m / min, temperature of 280℃-290℃, and traction ratio of 1.5-2.

[0023] In one embodiment of the present invention, in S3, the mass fraction of the multifunctional polyester masterbatch in the multifunctional polyester fiber based on modified graphene quantum dots is 10%-15%.

[0024] The second object of the present invention is to provide a multifunctional polyester fiber based on modified graphene quantum dots prepared by the method described.

[0025] In one embodiment of the present invention, the far-infrared normal emissivity of the multifunctional polyester fiber based on modified graphene quantum dots is 0.89-0.92, the far-infrared radiation temperature rise is 2.6°C-3.3°C, the breaking strength is 3.3cN / detx-3.5cN / detx, and the volume specific resistance is not more than 1*10 8 Ω·cm.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0027] (1) The preparation method described in the present invention uses dopamine hydrochloride and 1,4-phenylenediamine to modify graphene quantum dots by in-situ polymerization deposition. Under acidic conditions and the action of a catalyst, the catechol structure of dopamine hydrochloride is easily oxidized to undergo a polymerization reaction to generate polydopamine. Polydopamine has high adhesion and can produce good grafting on graphene quantum dots. 1,4-phenylenediamine and its self-polymers are rich in active groups such as amino groups and can be directly polymerized with dopamine hydrochloride, or 1,4-phenylenediamine can be polymerized with dopamine hydrochloride after self-polymerization. The polydopamine and polyaniline chain segments are interlaced and cross-linked to form polyaniline-modified polydopamine. Therefore, the polyaniline structure is aggregated on the outside of the polydopamine and the polydopamine is on the inside. On the one hand, the modified polydopamine has high adhesion to graphene quantum dots, completing efficient coating of graphene quantum dots. On the other hand, 1,4-phenylenediamine and its self-polymers can also participate in the polymerization of dopamine hydrochloride, introducing the aromatic structure of polyaniline into the polydopamine molecular chain to improve the thermal stability of polydopamine and its compatibility with polyester fibers.

[0028] (2) The modified graphene quantum dots described in the present invention are evenly dispersed in the polyester fiber, not only having high functionality, but also causing little damage to the strength performance of the polyester fiber; polyaniline-modified polydopamine has good conductivity, so the modified graphene quantum dots have excellent far-infrared antistatic multifunctionality. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific embodiments so that those skilled in the art can better understand the present invention and implement it. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. It should be understood that the specific embodiments are only used to explain the present invention, but the embodiments are not intended to limit the present invention.

[0030] In the present invention, unless otherwise explained, technical and scientific terms used in the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs.

[0031] In the present invention, unless otherwise stated, the term "and / or" used in the present invention includes any and all combinations of one or more of the associated listed items.

[0032] In the present invention, unless otherwise stated, the experimental methods used in the embodiments of the present invention are conventional methods unless otherwise stated, and the materials, reagents, etc. used are all commercially available unless otherwise stated.

[0033] In the present invention, unless otherwise specified, the graphene quantum dots used in the embodiments of the present invention are purchased from Wuxi Ensource Technology Co., Ltd. Example 1

[0034] The multifunctional polyester fiber based on modified graphene quantum dots and the preparation method thereof of this embodiment specifically include the following steps:

[0035] S1. Add graphene quantum dots to an aqueous solution of dopamine hydrochloride, disperse by ultrasonication for 1.5 hours, adjust the pH to 3.5, then add ammonium persulfate to react at 45° C. for 2.5 hours, finally add an ethanol solution of 1,4-phenylenediamine to continue the reaction for 3 hours, centrifuge, wash with ethanol and distilled water twice in sequence, and dry to obtain modified graphene quantum dot powder; wherein the mass ratio of graphene quantum dots to dopamine hydrochloride is 4.5:1, the mass ratio of dopamine hydrochloride to 1,4-phenylenediamine is 3:1.5; and the molar ratio of ammonium persulfate to dopamine hydrochloride is 1:1.5;

[0036] S2, the modified graphene quantum dot powder was vacuum dried at 75°C for 8h; the polyester powder was vacuum dried at 125°C for 11h, and after mixing, it was melt blended, extruded, cooled and pelletized by a twin-screw extruder. The temperature of the twin-screw extruder was 262°C, and a multifunctional polyester masterbatch with a mass fraction of modified graphene quantum dot powder of 23% was obtained;

[0037] S3, the multifunctional polyester masterbatch and the polyester chips were pre-crystallized in a 95°C blast oven for 3.5 hours, and then continued to be dried at 128°C for 13 hours, so that the final moisture content of the multifunctional polyester masterbatch and the polyester chips was less than 100 ppm. After mixing, they were spun by a melt spinning machine, cooled and oiled, pre-stretched, wound and stretched. The speed of the melt spinning machine was 2700 m / min, the temperature was 285°C, and the pulling ratio was 1.8, to obtain a multifunctional polyester fiber based on modified graphene quantum dots with a mass fraction of 13% of the multifunctional polyester masterbatch. Example 2

[0038] The multifunctional polyester fiber based on modified graphene quantum dots and the preparation method thereof of this embodiment specifically include the following steps:

[0039] S1. Add graphene quantum dots to an aqueous solution of dopamine hydrochloride, disperse by ultrasonication for 1 hour, adjust the pH to 3, then add ammonium persulfate to react at 40°C for 3 hours, finally add an ethanol solution of 1,4-phenylenediamine to continue the reaction for 4 hours, centrifuge, wash with ethanol and distilled water twice in sequence, and dry to obtain modified graphene quantum dot powder; wherein the mass ratio of graphene quantum dots to dopamine hydrochloride is 4:1, the mass ratio of dopamine hydrochloride to 1,4-phenylenediamine is 3:1; and the molar ratio of ammonium persulfate to dopamine hydrochloride is 1:1;

[0040] S2, the modified graphene quantum dot powder was vacuum dried at 70°C for 9h; the polyester powder was vacuum dried at 120°C for 12h, and after mixing, it was melt blended, extruded, cooled and pelletized by a twin-screw extruder. The temperature of the twin-screw extruder was 255°C, and a multifunctional polyester masterbatch with a mass fraction of 20% of the modified graphene quantum dot powder was obtained;

[0041] S3, the multifunctional polyester masterbatch and the polyester chips were pre-crystallized in a 90°C blast oven for 4 hours, and then continued to be dried at 120°C for 15 hours, so that the final moisture content of the multifunctional polyester masterbatch and the polyester chips was less than 100 ppm. After mixing, they were spun by a melt spinning machine, cooled and oiled, pre-stretched, wound and stretched. The speed of the melt spinning machine was 2600 m / min, the temperature was 290°C, and the pulling ratio was 1.5, to obtain a multifunctional polyester fiber based on modified graphene quantum dots with a mass fraction of 10% of the multifunctional polyester masterbatch. Example 3

[0042] The multifunctional polyester fiber based on modified graphene quantum dots and the preparation method thereof of this embodiment specifically include the following steps:

[0043] S1. Add graphene quantum dots to an aqueous solution of dopamine hydrochloride, disperse by ultrasonication for 2 hours, adjust the pH to 4, then add ammonium persulfate to react at 50°C for 2 hours, finally add an ethanol solution of 1,4-phenylenediamine to continue the reaction for 2 hours, centrifuge, wash with ethanol and distilled water twice in sequence, and dry to obtain modified graphene quantum dot powder; wherein the mass ratio of graphene quantum dots to dopamine hydrochloride is 5:1, the mass ratio of dopamine hydrochloride to 1,4-phenylenediamine is 3:2; and the molar ratio of ammonium persulfate to dopamine hydrochloride is 1:2;

[0044] S2, the modified graphene quantum dot powder was vacuum dried at 80°C for 7h; the polyester powder was vacuum dried at 130°C for 10h, and after mixing, it was melt blended, extruded, cooled and pelletized by a twin-screw extruder. The temperature of the twin-screw extruder was 270°C, and a multifunctional polyester masterbatch with a mass fraction of modified graphene quantum dot powder of 25% was obtained;

[0045] S3, the multifunctional polyester masterbatch and polyester chips were pre-crystallized in a 100°C blast oven for 3 hours, and then continued to be dried at 135°C for 10 hours, so that the final moisture content of the multifunctional polyester masterbatch and the polyester chips was less than 100 ppm. After mixing, they were spun through a melt spinning machine, cooled and oiled, pre-stretched, wound and stretched. The speed of the melt spinning machine was 2800 m / min, the temperature was 280°C, and the pulling ratio was 2, so as to obtain a multifunctional polyester fiber based on modified graphene quantum dots with a mass fraction of 15% of the multifunctional polyester masterbatch. Comparative Example 1

[0046] The method is basically the same as Example 1, except that: dopamine hydrochloride is not used to modify the graphene quantum dots (1,4-phenylenediamine modification alone is used). Comparative Example 2

[0047] The method is basically the same as Example 1, except that 1,4-phenylenediamine is replaced with o-phenylenediamine when modifying the graphene quantum dots. Comparative Example 3

[0048] The method is basically the same as Example 1, except that: 1,4-phenylenediamine-modified graphene quantum dots are not used (modification with dopamine hydrochloride alone). Comparative Example 4

[0049] The method is basically the same as Example 1, except that the graphene quantum dots are replaced with nano bamboo charcoal. Comparative Example 5

[0050] The method is basically the same as Example 1, except that graphene quantum dots and polyester powder are directly used for granulation and spinning. Comparative Example 6

[0051] The process is basically the same as Example 1, except that polyester powder is directly used for granulation and spinning (unmodified polyester fiber).

[0052] Test Case

[0053] The far infrared properties of the multifunctional polyester fibers modified with graphene quantum dots (modified polyester fibers) and the unmodified polyester fibers prepared in Examples 1-3 and Comparative Examples 1-6 were tested:

[0054] Far infrared performance: Refer to GB / T 30127-2013 "Testing and evaluation of far infrared performance of textiles" to test the far infrared emissivity and heating performance of unmodified polyester fiber and modified polyester fiber;

[0055] Physical properties: Refer to GB / T 14344-2022 "Test method for tensile properties of chemical fiber filaments" to test the breaking strength of unmodified polyester fiber and modified polyester fiber;

[0056] Antistatic performance: Refer to GB / T 14342-2015 "Test method for specific electrical resistance of chemical staple fibers" to test the antistatic properties of unmodified polyester fibers and modified polyester fibers;

[0057] Table 1 shows the relevant properties of the unmodified polyester fiber and the modified polyester fiber finally measured:

[0058] Table 1

[0059]

[0060] As can be seen from Table 1, the modified polyester fiber has excellent far-infrared performance and far-infrared heating performance, antistatic performance and mechanical properties.

[0061] By comparing Example 1 and Comparative Example 1, it can be seen that when polyaniline is used alone to modify the graphene quantum dots, the far-infrared performance, antistatic performance and mechanical properties of the modified polyester fiber deteriorate. This is because polyaniline alone cannot produce a good combination with the graphene quantum dots, and the coating modification effect is poor, resulting in poor dispersion performance in the polyester fiber.

[0062] By comparing Example 1 and Comparative Example 2, it can be seen that when o-phenylenediamine and dopamine are used to modify the graphene quantum dots, the far-infrared performance, antistatic performance and mechanical properties of the modified polyester fiber deteriorate. This is because o-phenylenediamine is difficult to polymerize to produce a polyaniline structure, resulting in a poor effect of modifying the graphene quantum dots.

[0063] By comparing Example 1 and Comparative Example 3, it can be seen that when polydopamine is used alone to modify the graphene quantum dots, the far-infrared performance, antistatic performance and mechanical properties of the modified polyester fiber deteriorate. This is because the surface of the graphene quantum dots modified by polydopamine alone has high adhesion, which makes the polydopamine-modified graphene quantum dots adhere and aggregate to each other during the spinning heating process, making it difficult to disperse evenly in the polyester fiber. In addition, the surface polydopamine is easily decomposed under high temperature conditions, resulting in severe damage to the mechanical properties of the polyester fiber.

[0064] By comparing Example 1 and Comparative Example 4, it can be seen that when the modified nano-bamboo charcoal is used to modify the polyester fiber, the far-infrared performance, antistatic performance and mechanical properties of the modified polyester fiber deteriorate. This is because the far-infrared efficiency and antistatic performance of the nano-bamboo charcoal are lower than those of graphene quantum dots, and its dispersion performance is weaker than that of graphene quantum dots, resulting in greater damage to the mechanical properties.

[0065] By comparing Example 1 and Comparative Example 5, it can be seen that the far-infrared performance, antistatic performance and mechanical properties of the polyester fiber modified directly with graphene quantum dots deteriorate. This is because the graphene quantum dots have high surface energy, poor compatibility with polyester fibers, and are easily agglomerated in polyester fibers, resulting in poor dispersion performance in the polyester fibers.

[0066] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a multifunctional polyester fiber based on modified graphene quantum dots, characterized in that: The following steps are involved: S1. Under acidic conditions and the action of a catalyst, graphene quantum dots and dopamine hydrochloride are reacted in water in the first stage, and then an ethanol solution of 1,4-phenylenediamine is added to carry out a second stage reaction to obtain modified graphene quantum dots; the catalyst is ammonium persulfate; the temperature of the first stage reaction is 40°C-50°C, and the time is 2h-3h; the time of the second stage reaction is 2h-4h; S2, granulating the modified graphene quantum dots and polyester powder described in S1 to obtain a multifunctional polyester masterbatch; S3, spinning the multifunctional polyester masterbatch and polyester chips described in S2 to obtain the multifunctional polyester fiber based on modified graphene quantum dots.

2. The method for preparing a multifunctional polyester fiber based on modified graphene quantum dots according to claim 1, characterized in that: In S1, the mass ratio of the graphene quantum dots to dopamine hydrochloride is (4-5):1, the mass ratio of dopamine hydrochloride to 1,4-phenylenediamine is 3:(1-2); and the molar ratio of the catalyst to dopamine hydrochloride is 1:(1-2).

3. The method for preparing a multifunctional polyester fiber based on modified graphene quantum dots according to claim 1, characterized in that: In S1, the pH of the acidic condition is 3-4.

4. The method for preparing a multifunctional polyester fiber based on modified graphene quantum dots according to claim 1, characterized in that: In S2, the granulation is performed by melt blending, extrusion molding, cooling and pelletizing through a twin-screw extruder; the granulation temperature is 255°C-270°C.

5. The method for preparing a multifunctional polyester fiber based on modified graphene quantum dots according to claim 1, characterized in that: In S2, the mass fraction of the modified graphene quantum dots in the multifunctional polyester masterbatch is 20%-25%.

6. The method for preparing a multifunctional polyester fiber based on modified graphene quantum dots according to claim 1, characterized in that: In S3, the spinning is carried out by a melt spinning machine, followed by oiling, pre-stretching, winding, and stretching. The spinning process parameters are: a speed of 2600m / min-2800m / min, a temperature of 280℃-290℃, and a drawing ratio of 1.5-2.

7. The method for preparing a multifunctional polyester fiber based on modified graphene quantum dots according to claim 1, characterized in that: In S3, the mass fraction of the multifunctional polyester masterbatch in the multifunctional polyester fiber based on modified graphene quantum dots is 10%-15%.

8. A multifunctional polyester fiber based on modified graphene quantum dots prepared by the method according to any one of claims 1 to 7.

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