Graphene oxide-reinforced polyester fiber and method for preparing the same

Abstract

The application relates to a graphene oxide reinforced polyester fiber and a preparation method thereof, and belongs to the technical field of polyester fibers. The graphene oxide reinforced polyester fiber is prepared by mixing, extruding, granulating and melt spinning of polyester chips and coated graphene oxide; the coated graphene oxide is obtained by sequentially coating polydopamine on graphene oxide, ring-opening addition of double-end epoxy-based organosilicon and grafting of aniline / p-aminobenzoic acid; the double-end epoxy-based organosilicon is prepared by silicon-hydrogen addition of allyl glycidyl ether and tetramethyldisiloxane; the coated graphene oxide can be uniformly dispersed in the polyester fiber and is not easy to precipitate, and correspondingly, the prepared graphene oxide reinforced polyester fiber has higher breaking strength, and the breaking strength can be maintained at a high value even after multiple washes.

Description

Technical Field

[0001] This invention belongs to the field of polyester fiber technology, specifically relating to a graphene oxide reinforced polyester fiber and its preparation method. Background Technology

[0002] Polyester fiber, also known as polyester, is a synthetic fiber made from organic diacids and diols through chemical polycondensation. Its invention can be traced back to the mid-20th century, and it has now become one of the most important synthetic fibers. Its excellent abrasion resistance, chemical stability, and resilience make it widely used in the textile and apparel industries. Even so, to further increase the added value of polyester fibers, many existing technologies utilize graphene oxide to modify them. Some studies have shown that introducing a certain amount of graphene oxide into polyester fibers can increase the tensile strength with increasing graphene oxide content. However, these existing technologies still have certain drawbacks limiting their effectiveness. This is because graphene oxide has limited dispersibility in the polymer matrix, i.e., polyester fiber, and exhibits a relatively obvious tendency to agglomerate, which to some extent hinders the improvement of tensile strength. In addition, graphene oxide and polyester fiber are essentially two different types of substances—one inorganic and the other organic. After repeated washing, graphene oxide is easily precipitated out, directly causing a loss of graphene oxide. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a graphene oxide reinforced polyester fiber and its preparation method.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention provides a method for preparing graphene oxide-reinforced polyester fibers, the method comprising the following steps:

[0006] Polyester chips and graphene oxide coating are mixed and extruded and granulated using a twin-screw extruder to obtain masterbatch; the masterbatch is then melt-spun.

[0007] Preferably, the mass ratio of the polyester chips to the coated graphene oxide is 100:0.5-1.

[0008] Preferably, the coated graphene oxide is prepared by the following steps:

[0009] Step A: Mix 150-160 parts by weight of Tris hydrochloric acid buffer and 0.5-1 parts by weight of graphene oxide in an ultrasonic bath at 20-30°C for 15-30 minutes. Then, while stirring in air, add 10 parts by weight of dopamine hydrochloride aqueous solution. After all the solution has been added, continue stirring for 18-24 hours. Centrifuge, wash with deionized water, and dry to obtain component A.

[0010] Step B: Mix 100-110 parts by weight of toluene and 50 parts by weight of chloroform at room temperature, then add 1-1.5 parts by weight of component A and 4 parts by weight of di-terminated epoxy organosilicon. Then, reflux and stir at 55-60°C in the dark under a nitrogen atmosphere for 24-26 hours. After naturally cooling to room temperature, centrifuge, wash with toluene, and dry to obtain component B.

[0011] Step C: Mix 100-120 parts by weight of ethanol and 4-6 parts by weight of grafting agent at room temperature, then add 1 part by weight of component B, and then reflux and stir at 55-60℃ for 14-16 hours under a nitrogen atmosphere. Allow to cool naturally to room temperature, centrifuge, wash with deionized water, and dry.

[0012] More preferably, the pH of the Tris hydrochloric acid buffer solution in step A is 8.1-8.5.

[0013] More preferably, the power of the ultrasound in step A is 200-500W.

[0014] More preferably, the dripping rate in step A is 1-2 drops / s.

[0015] More preferably, the mass fraction of the dopamine hydrochloride aqueous solution in step A is 10-13%.

[0016] More preferably, the drying in step A refers to vacuum drying at 40-80°C to constant weight.

[0017] More preferably, the mixing in step B refers to mixing by reflux stirring for 5-10 minutes in the dark.

[0018] More preferably, the double-terminated epoxy organosilicon described in step B is prepared by the following steps:

[0019] Add 0.2-0.4 parts by weight of platinum catalyst and tetramethyldihydrodisiloxane to 10-15 parts by weight of allyl glycidyl ether, then reflux and stir at 60-70°C for 8-10 hours under a nitrogen atmosphere, allow to cool naturally to room temperature, filter, and discard the filter residue; the molar ratio of allyl glycidyl ether to tetramethyldihydrodisiloxane is 2:1.

[0020] More preferably, the drying in step B refers to vacuum drying at 60-80°C to constant weight.

[0021] More preferably, the grafting agent in step C comprises aniline and p-aminobenzoic acid in a mass ratio of 2-3:1.

[0022] More preferably, the mixing in step C refers to mixing by stirring for 5-10 minutes.

[0023] More preferably, the drying in step C refers to vacuum drying at 30-80°C to constant weight.

[0024] Preferably, the operating parameters of the twin-screw extruder are: zone 1 temperature 250℃, zone 2 temperature 260-265℃, zone 3 temperature 265-270℃, zone 4 temperature 275℃, zone 5 temperature 265-270℃, die head temperature 255℃, and rotation speed 80-100 r / min.

[0025] Preferably, the process parameters for melt spinning are: spinneret diameter 0.2-0.4 mm, speed 1000 m / min, temperature 275-280℃, and draw ratio 3-4.

[0026] Secondly, the present invention provides a graphene oxide reinforced polyester fiber prepared by the preparation method described above.

[0027] Given the poor dispersibility and tendency for precipitation of existing graphene oxide in polyester fibers, this invention uses graphene oxide as a technological improvement to prepare coated graphene oxide. This coated graphene oxide can be uniformly dispersed in polyester fibers and is less prone to precipitation. Consequently, the resulting graphene oxide-reinforced polyester fibers exhibit higher tensile strength, which remains high even after multiple washes. Firstly, graphene oxide has high surface activity, easily achieving polydopamine coating through hydrogen bonding and other interactions, thus enabling the inorganic interface transformation of graphene oxide... Instead, an organic interface with groups such as imino and benzene rings was used. However, the inventors found that the dispersibility of graphene oxide was not significantly improved after being coated with polydopamine. This is because the preparation of graphene oxide-reinforced polyester fibers requires extrusion granulation and melt spinning processes, both of which involve high temperatures, easily causing thermal decomposition of polydopamine and hindering its effectiveness. To address this issue, the inventors added a double-terminated epoxy organosilicon obtained by hydrosilylation of allyl glycidyl ether and tetramethyldihydrodisiloxane. The process involves the ring-opening addition reaction mechanism of epoxy (single-terminal) and imino groups, introducing -Si-O-Si- segments and epoxy groups. Then, a certain mass ratio of aniline and p-aminobenzoic acid are added as grafting agents. The reaction mechanism again involves the ring-opening addition reaction of epoxy and amino groups, grafting a small amount of carboxyl groups and more benzene rings. On the one hand, the presence of -Si-O-Si- segments and more benzene rings synergistically improves the heat resistance of the coating layer, preventing thermal decomposition and ensuring that the resulting coated graphene oxide can be effectively and uniformly dispersed in polyester fibers. On the other hand, the small amount of carboxyl groups... The carboxyl group can form hydrogen bonds with the ester group of polyester fiber, which not only enhances the interfacial bonding strength, but also further promotes dispersibility (the molecular structure of polyester fiber contains both polar and non-polar segments. A small amount of carboxyl group can better "match" the polyester fiber by controlling the polarity of the coating graphene oxide, i.e., the coating layer, thereby improving dispersibility and interfacial bonding strength). At the same time, since the surface of the coated graphene oxide is rich in a large number of benzene ring structures, the steric hindrance effect is strong, the intermolecular force is large, and the interfacial bonding strength is high, thus effectively reducing the possibility of precipitation.

[0028] The beneficial effects of this invention are as follows:

[0029] 1. The graphene oxide reinforced polyester fiber prepared by this invention has excellent tensile strength.

[0030] 2. The graphene oxide reinforced polyester fiber prepared by this invention can still maintain a high breaking strength even after multiple washings. Detailed Implementation

[0031] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0032] The polyester chips used in the following examples and comparative examples were all purchased from China Petroleum & Chemical Corporation, grade SD501 (dried at 140°C for 6 hours before use, and then naturally cooled to room temperature); the graphene oxide was purchased from Suzhou Carbon-rich Graphene Technology Co., Ltd., product name: industrial grade graphene oxide powder; the platinum catalyst was purchased from Shaanxi Ruike New Materials Co., Ltd., product name: platinum carbon.

[0033] Centrifugation refers to centrifuging at 10,000 r / min for 10 min and then discarding the supernatant.

[0034] Example 1

[0035] A method for preparing graphene oxide-reinforced polyester fiber, the method comprising the following steps:

[0036] Polyester chips and graphene oxide coating are mixed and extruded and granulated using a twin-screw extruder to obtain masterbatch; the masterbatch is then melt-spun.

[0037] The mass ratio of the polyester chips to the coated graphene oxide is 100:0.5.

[0038] The coated graphene oxide is prepared through the following steps:

[0039] Step A: Mix 150 parts by weight of Tris hydrochloric acid buffer and 0.5 parts by weight of graphene oxide by sonication at 20°C for 15 min. Then, add 10 parts by weight of dopamine hydrochloride aqueous solution dropwise while stirring in air. After all the solution has been added, continue stirring for 18 h. Centrifuge, wash with deionized water, and dry to obtain component A.

[0040] Step B: Mix 100 parts by weight of toluene and 50 parts by weight of chloroform at room temperature, then add 1 part by weight of component A and 4 parts by weight of double-terminated epoxy organosilicon. Then, reflux and stir at 55°C in the dark for 24 hours under a nitrogen atmosphere. After naturally cooling to room temperature, centrifuge, wash with toluene, and dry to obtain component B.

[0041] Step C: Mix 100 parts by weight of ethanol and 4 parts by weight of grafting agent at room temperature, then add 1 part by weight of component B, and then reflux and stir at 55°C for 14 hours under a nitrogen atmosphere. Allow to cool naturally to room temperature, centrifuge, wash with deionized water, and dry.

[0042] The pH of the Tris hydrochloric acid buffer solution described in step A is 8.1.

[0043] The power of the ultrasound in step A is 200W.

[0044] The dropping rate in step A is 1 drop / s.

[0045] The mass fraction of the dopamine hydrochloride aqueous solution in step A is 10%.

[0046] The drying described in step A refers to vacuum drying at 40°C to constant weight.

[0047] The mixing described in step B refers to mixing by reflux and stirring for 5 minutes in the dark.

[0048] The double-terminated epoxy organosilicon described in step B is prepared through the following steps:

[0049] Add 0.2 parts by weight of platinum catalyst and tetramethyldihydrodisiloxane to 10 parts by weight of allyl glycidyl ether, then reflux and stir at 60°C for 8 hours under a nitrogen atmosphere, allow to cool naturally to room temperature, filter, and discard the filter residue; the molar ratio of allyl glycidyl ether to tetramethyldihydrodisiloxane is 2:1.

[0050] The drying described in step B refers to vacuum drying at 60°C to constant weight.

[0051] The grafting agent in step C comprises aniline and p-aminobenzoic acid in a mass ratio of 2:1.

[0052] The mixing mentioned in step C refers to stirring for 5 minutes.

[0053] The drying described in step C refers to vacuum drying at 30°C to constant weight.

[0054] The operating parameters of the twin-screw extruder are: zone 1 temperature 250℃, zone 2 temperature 260℃, zone 3 temperature 265℃, zone 4 temperature 275℃, zone 5 temperature 265℃, die head temperature 255℃, and rotation speed 80r / min.

[0055] The process parameters for melt spinning are: spinneret diameter 0.3 mm, speed 1000 m / min, temperature 275 °C, and draw ratio 3.2.

[0056] A graphene oxide reinforced polyester fiber prepared by the method described above.

[0057] Example 2

[0058] A method for preparing graphene oxide-reinforced polyester fiber, the method comprising the following steps:

[0059] Polyester chips and graphene oxide coating are mixed and extruded and granulated using a twin-screw extruder to obtain masterbatch; the masterbatch is then melt-spun.

[0060] The mass ratio of the polyester chips to the coated graphene oxide is 100:1.

[0061] The coated graphene oxide is prepared through the following steps:

[0062] Step A: Mix 160 parts by weight of Tris hydrochloric acid buffer and 1 part by weight of graphene oxide by sonication at 30°C for 30 min. Then, add 10 parts by weight of dopamine hydrochloride aqueous solution dropwise while stirring in air. After all the solution has been added, continue stirring for 24 h. Centrifuge, wash with deionized water, and dry to obtain component A.

[0063] Step B: Mix 110 parts by weight of toluene and 50 parts by weight of chloroform at room temperature, then add 1.5 parts by weight of component A and 4 parts by weight of double-terminated epoxy organosilicon. Then, reflux and stir at 60°C in the dark for 26 hours under a nitrogen atmosphere. After naturally cooling to room temperature, centrifuge, wash with toluene, and dry to obtain component B.

[0064] Step C: Mix 120 parts by weight of ethanol and 6 parts by weight of grafting agent at room temperature, then add 1 part by weight of component B, and then reflux and stir at 60°C for 16 hours under a nitrogen atmosphere. Allow to cool naturally to room temperature, centrifuge, wash with deionized water, and dry.

[0065] The pH of the Tris hydrochloric acid buffer solution described in step A is 8.5.

[0066] The power of the ultrasound in step A is 500W.

[0067] The dripping rate in step A is 2 drops / s.

[0068] The mass fraction of the dopamine hydrochloride aqueous solution in step A is 13%.

[0069] The drying described in step A refers to vacuum drying at 80°C to constant weight.

[0070] The mixing described in step B refers to mixing by reflux and stirring for 10 minutes in the dark.

[0071] The double-terminated epoxy organosilicon described in step B is prepared through the following steps:

[0072] Add 0.4 parts by weight of platinum catalyst and tetramethyldihydrodisiloxane to 15 parts by weight of allyl glycidyl ether, then reflux and stir at 70°C for 10 h under a nitrogen atmosphere, allow to cool naturally to room temperature, filter, and discard the filter residue; the molar ratio of allyl glycidyl ether to tetramethyldihydrodisiloxane is 2:1.

[0073] The drying described in step B refers to vacuum drying at 80°C to constant weight.

[0074] The grafting agent in step C comprises aniline and p-aminobenzoic acid in a mass ratio of 3:1.

[0075] The mixing mentioned in step C refers to stirring for 10 minutes.

[0076] The drying described in step C refers to vacuum drying at 80°C to constant weight.

[0077] The operating parameters of the twin-screw extruder are: zone 1 temperature 250℃, zone 2 temperature 265℃, zone 3 temperature 270℃, zone 4 temperature 275℃, zone 5 temperature 270℃, die head temperature 255℃, and rotation speed 100r / min.

[0078] The process parameters for melt spinning are: spinneret diameter 0.3 mm, speed 1000 m / min, temperature 280 ℃, and draw ratio 3.8.

[0079] A graphene oxide reinforced polyester fiber prepared by the method described above.

[0080] Example 3

[0081] A method for preparing graphene oxide-reinforced polyester fiber, the method comprising the following steps:

[0082] Polyester chips and graphene oxide coating are mixed and extruded and granulated using a twin-screw extruder to obtain masterbatch; the masterbatch is then melt-spun.

[0083] The mass ratio of the polyester chips to the coated graphene oxide is 100:0.8.

[0084] The coated graphene oxide is prepared through the following steps:

[0085] Step A: Mix 154 parts by weight of Tris hydrochloric acid buffer and 0.7 parts by weight of graphene oxide by sonication at 25°C for 22 min. Then, add 10 parts by weight of dopamine hydrochloride aqueous solution dropwise while stirring in air. After all the solution has been added, continue stirring for 21 h. Centrifuge, wash with deionized water, and dry to obtain component A.

[0086] Step B: Mix 103 parts by weight of toluene and 50 parts by weight of chloroform at room temperature, then add 1.3 parts by weight of component A and 4 parts by weight of double-terminated epoxy organosilicon. Then, reflux and stir at 59°C in the dark for 25 hours under a nitrogen atmosphere. After naturally cooling to room temperature, centrifuge, wash with toluene, and dry to obtain component B.

[0087] Step C: Mix 110 parts by weight of ethanol and 5 parts by weight of grafting agent at room temperature, then add 1 part by weight of component B, and then reflux and stir at 57°C for 15 hours under a nitrogen atmosphere. Allow to cool naturally to room temperature, centrifuge, wash with deionized water, and dry.

[0088] The pH of the Tris hydrochloric acid buffer solution described in step A is 8.4.

[0089] The power of the ultrasound in step A is 400W.

[0090] The dripping rate in step A is 1.5 drops / s.

[0091] The mass fraction of the dopamine hydrochloride aqueous solution in step A is 12%.

[0092] The drying described in step A refers to vacuum drying at 60°C to constant weight.

[0093] The mixing described in step B refers to mixing by reflux and stirring for 7 minutes in the dark.

[0094] The double-terminated epoxy organosilicon described in step B is prepared through the following steps:

[0095] Add 0.3 parts by weight of platinum catalyst and tetramethyldihydrodisiloxane to 13 parts by weight of allyl glycidyl ether, then reflux and stir at 64°C for 9 hours under a nitrogen atmosphere, allow to cool naturally to room temperature, filter, and discard the filter residue; the molar ratio of allyl glycidyl ether to tetramethyldihydrodisiloxane is 2:1.

[0096] The drying described in step B refers to vacuum drying at 65°C to constant weight.

[0097] The grafting agent in step C comprises aniline and p-aminobenzoic acid in a mass ratio of 2.6:1.

[0098] The mixing mentioned in step C refers to stirring for 9 minutes.

[0099] The drying described in step C refers to vacuum drying at 70°C to constant weight.

[0100] The operating parameters of the twin-screw extruder are: zone 1 temperature 250℃, zone 2 temperature 264℃, zone 3 temperature 267℃, zone 4 temperature 275℃, zone 5 temperature 268℃, die head temperature 255℃, and rotation speed 90r / min.

[0101] The process parameters for melt spinning are: spinneret diameter 0.3 mm, speed 1000 m / min, temperature 277 °C, and draw ratio 3.5.

[0102] A graphene oxide reinforced polyester fiber prepared by the method described above.

[0103] Comparative Example 1

[0104] The difference between Comparative Example 1 and Example 3 is that aniline was replaced with an equal weight of p-aminobenzoic acid, while the rest remained the same.

[0105] Comparative Example 2

[0106] The difference between Comparative Example 2 and Example 3 is that p-aminobenzoic acid was replaced with an equal weight of aniline, while the rest remained the same.

[0107] Comparative Example 3

[0108] The difference between Comparative Example 3 and Example 3 is that step C is omitted, and the graphene oxide coating is replaced with an equal weight of component B, while the rest remain the same.

[0109] Comparative Example 4

[0110] The difference between Comparative Example 4 and Example 3 is that steps B and C are omitted, and the graphene oxide coating is replaced with an equal weight of component A, while the rest remain the same.

[0111] Comparative Example 5

[0112] The difference between Comparative Example 5 and Example 3 is that the dual-terminal epoxy organosilicon is replaced with an equal weight of ethylene glycol diglycidyl ether, while the rest remains the same.

[0113] Comparative Example 6

[0114] The difference between Comparative Example 6 and Example 3 is that the graphene oxide coating was replaced with an equal weight of graphene oxide, while all other aspects remained the same.

[0115] Test experiment:

[0116] Fracture strength test:

[0117] The tensile strength of the graphene oxide reinforced polyester fibers prepared in Examples 1-3 and Comparative Examples 1-6 was tested using a fiber strength tester.

[0118] Table 1. Fracture strength test results

[0119]

[0120]

[0121] Precipitation resistance test:

[0122] The graphene oxide reinforced polyester fibers prepared in Examples 1-3 and Comparative Examples 1-6 were washed 40 times in a washing machine (with the same washing mode), and then air-dried before being tested for breaking strength using a fiber strength tester.

[0123] Table 2 Results of the precipitation resistance test

[0124] Example 1 4.7 Example 2 5.4 Example 3 5.0 Comparative Example 1 3.9 Comparative Example 2 4.3 Comparative Example 3 2.6 Comparative Example 4 2.2 Comparative Example 5 3.3 Comparative Example 6 1.8

[0125] As shown in Tables 1 and 2, the graphene oxide-reinforced polyester fiber prepared by this invention has superior tensile strength, and its tensile strength can still be maintained at a high value even after multiple washings. The treatment of graphene oxide in Comparative Examples 1-5 is different from that of this invention, which leads to a reduction in its dispersibility and interfacial bonding strength in the polyester fiber to varying degrees, making it difficult to achieve good technical results. As for Comparative Example 6, no treatment was performed on the graphene oxide, resulting in the worst technical effect.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing graphene oxide reinforced polyester fiber, characterized in that, The preparation method includes the following steps: Polyester chips and graphene oxide coating are mixed and extruded and granulated using a twin-screw extruder to obtain masterbatch; the masterbatch is then melt-spun; the mass ratio of the polyester chips to the graphene oxide coating is 100:0.5-1. The coated graphene oxide is prepared through the following steps: Step A: Mix 150-160 parts by weight of Tris hydrochloric acid buffer and 0.5-1 parts by weight of graphene oxide in an ultrasonic bath at 20-30°C for 15-30 minutes. Then, while stirring in air, add 10 parts by weight of dopamine hydrochloride aqueous solution. After all the solution has been added, continue stirring for 18-24 hours. Centrifuge, wash with deionized water, and dry to obtain component A. Step B: Mix 100-110 parts by weight of toluene and 50 parts by weight of chloroform at room temperature, then add 1-1.5 parts by weight of component A and 4 parts by weight of di-terminated epoxy organosilicon. Then, reflux and stir at 55-60°C in the dark under a nitrogen atmosphere for 24-26 hours. After naturally cooling to room temperature, centrifuge, wash with toluene, and dry to obtain component B. Step C: Mix 100-120 parts by weight of ethanol and 4-6 parts by weight of grafting agent at room temperature, then add 1 part by weight of component B, and then reflux and stir at 55-60℃ for 14-16 hours under a nitrogen atmosphere. Allow to cool naturally to room temperature, centrifuge, wash with deionized water, and dry.

2. The method for preparing graphene oxide reinforced polyester fiber according to claim 1, characterized in that: The dripping rate described in step A is 1-2 drops / s.

3. The method for preparing graphene oxide reinforced polyester fiber according to claim 1, characterized in that: The mass fraction of the dopamine hydrochloride aqueous solution in step A is 10-13%.

4. The method for preparing graphene oxide reinforced polyester fiber according to claim 1, characterized in that: The double-terminated epoxy organosilicon described in step B is prepared through the following steps: Add 0.2-0.4 parts by weight of platinum catalyst and tetramethyldihydrodisiloxane to 10-15 parts by weight of allyl glycidyl ether, then reflux and stir at 60-70°C for 8-10 hours under a nitrogen atmosphere, allow to cool naturally to room temperature, filter, and discard the filter residue; the molar ratio of allyl glycidyl ether to tetramethyldihydrodisiloxane is 2:

1.

5. The method for preparing graphene oxide reinforced polyester fiber according to claim 1, characterized in that: The grafting agent in step C comprises aniline and p-aminobenzoic acid in a mass ratio of 2-3:

1.

6. The method for preparing graphene oxide reinforced polyester fiber according to claim 1, characterized in that: The operating parameters of the twin-screw extruder are: zone 1 temperature 250℃, zone 2 temperature 260-265℃, zone 3 temperature 265-270℃, zone 4 temperature 275℃, zone 5 temperature 265-270℃, die head temperature 255℃, and rotation speed 80-100r / min.

7. The method for preparing graphene oxide reinforced polyester fiber according to claim 1, characterized in that: The process parameters for melt spinning are: spinneret diameter 0.2-0.4 mm, speed 1000 m / min, temperature 275-280℃, and draw ratio 3-4.

8. A graphene oxide reinforced polyester fiber prepared by the preparation method according to any one of claims 1-7.

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