A modified carbon fiber-polyphenylene sulfide composite material

Abstract

This application relates to the field of special plastics, and specifically discloses a modified carbon fiber-polyphenylene sulfide composite material. A modified carbon fiber-polyphenylene sulfide composite material is made from raw materials including the following parts by weight: 30-50 parts of polyphenylene sulfide, 30-50 parts of polydopamine-modified carbon fiber, 15-30 parts of modified hyperbranched polyolefin, and 0.1-0.5 part of an auxiliary agent; the polydopamine-modified carbon fiber has a carbon fiber as the core and polydopamine as the shell; the modified hyperbranched polyolefin is made from hydroxy-terminated butadiene and fluorinated polyacrylate. In this application, polydopamine-modified carbon fiber and modified hyperbranched polyolefin are used as modifiers, so that polyphenylene sulfide has more excellent wear resistance, mechanical properties and weather resistance.

Description

Technical Field

[0001] This application relates to the technical field of special plastics, and more specifically, it relates to a modified carbon fiber-polyphenylene sulfide composite material. Background Art

[0002] Polyphenylene sulfide (abbreviated as PPS) is a linear high-molecular compound composed of alternating benzene rings and sulfur atoms, and has properties such as high temperature resistance, radiation resistance, and wear resistance. However, it also has some disadvantages: for example, high cost, poor toughness, and easy cross-linking at high temperatures. Therefore, the preparation of PPS composite modified materials with more excellent comprehensive properties is a research hotspot in this field.

[0003] In related technologies, in order to reduce costs and improve the mechanical properties and wear resistance of polyphenylene sulfide materials, inorganic fillers are generally used as modifiers to modify polyphenylene sulfide to expand the scope of use of polyphenylene sulfide materials. Inorganic fillers generally select materials such as calcium carbonate, silicon dioxide, carbon fiber, and carbon black.

[0004] However, the above inorganic fillers usually have the following defects in the use process: First, the addition amount of inorganic fillers is limited because the compatibility between inorganic fillers and polyphenylene sulfide resin is poor and it is difficult to be fully dispersed in polyphenylene sulfide. When the addition amount of inorganic fillers is too much, stress concentration points are easily formed in polyphenylene sulfide, resulting in a decrease in the mechanical properties of polyphenylene sulfide materials; as the polyphenylene sulfide materials are used, the polyphenylene sulfide materials are worn, and some inorganic fillers fall off, resulting in... And when the addition amount of inorganic fillers is low, the improvement effect of inorganic fillers on the mechanical properties and wear resistance of polyphenylene sulfide materials is limited.

[0005] In view of the above situation, how to improve the wear resistance and mechanical properties of polyphenylene sulfide materials simultaneously is still a technical difficulty in this field. Summary of the Invention

[0006] This application provides a modified carbon fiber-polyphenylene sulfide composite material, which has excellent mechanical properties and wear resistance, excellent use performance, and a long service life.

[0007] A modified carbon fiber-polyphenylene sulfide composite material provided by this application adopts the following technical scheme:

[0008] A modified carbon fiber-polyphenylene sulfide composite material is made from raw materials including the following parts by weight:

[0009] Polyphenylene sulfide 30 - 50 parts;

[0010] Polydopamine-modified carbon fiber 10 - 20 parts;

[0011] Modified hyperbranched polyolefin 15 - 30 parts;

[0012] Auxiliary agent: 0.1 - 0.5 parts;

[0013] The polydopamine-modified carbon fiber has a carbon fiber core and a polydopamine shell;

[0014] The modified hyperbranched polyolefin is made from hydroxy-terminated butadiene and fluoroacrylate.

[0015] By adopting the above technical solution, this application uses polyphenylene sulfide as the main material, and polydopamine-modified carbon fiber and modified hyperbranched polyolefin as modifiers, so that polyphenylene sulfide has more excellent wear resistance and mechanical properties.

[0016] The specific principle is as follows: Polydopamine can self-polymerize into a film on the surface of carbon fiber, increasing the weight of carbon fiber and reducing the problem that carbon fiber is prone to floating during processing. The carbon fiber is not easily dispersed on the surface of polyphenylene sulfide;

[0017] Hydroxy-terminated polybutadiene is terminated with a hydroxyl group, and its main chain structure contains carbon-carbon double bonds. One end of fluoroacrylate contains carbon-carbon double bonds, and the carbon-carbon double bonds crosslink to obtain a modified hyperbranched polyolefin with multiple branches; the multi-branched structure of the modified hyperbranched polyolefin can increase the spacing between the molecular chains of polyphenylene sulfide, improve the molecular chain movement ability, and is conducive to promoting the dispersion of polydopamine-modified carbon fiber, auxiliary agent and other substances in polyphenylene sulfide.

[0018] At the same time, one end of the modified hyperbranched polyolefin contains a hydroxyl group, which can adsorb polydopamine-modified carbon fiber through hydrogen bond interaction. The modified hyperbranched polyolefin contains alkyl hydrocarbon chains and has good compatibility with polyphenylene sulfide. The modified hyperbranched polyolefin can serve as a bridge connecting polydopamine-modified carbon fiber and polyphenylene sulfide, further promoting the dispersion of polydopamine-modified carbon fiber in polyphenylene sulfide. The uniformly dispersed polydopamine-modified carbon fiber can effectively enhance the toughness of polyphenylene sulfide, and in the case of high addition amounts, it is not easy to form stress concentration points in polyphenylene sulfide. Both the mechanical properties and wear resistance of polyphenylene sulfide can be significantly improved.

[0019] Secondly, the molecular chain movement ability of the modified hyperbranched polyolefin itself is strong and it is easy to migrate to the surface of polyphenylene sulfide, which can serve as a buffer protection layer to prevent the polydopamine-modified carbon fiber in polyphenylene sulfide from being quickly exposed and falling off from polyphenylene sulfide.

[0020] Furthermore, fluorocarbon bonds are introduced into the modified hyperbranched polyolefin. The combination between fluorine and carbon is firm and they are closely packed on the outer layer of the carbon skeleton, which can effectively prevent the exposure of carbon atoms and the carbon-carbon main chain, and can effectively improve the weather resistance of polyphenylene sulfide.

[0021] In summary, the present application uses modified hyperbranched polyolefin and polydopamine-modified carbon fiber to modify polyphenylene sulfide, enabling polyphenylene sulfide to possess excellent mechanical properties, wear resistance, and weather resistance.

[0022] Optionally, the preparation method of the polydopamine-modified carbon fiber includes the following steps:

[0023] Prepare an aqueous dopamine solution, adjust the pH value of the aqueous dopamine solution to 8 - 8.5, immerse the carbon fiber in the aqueous dopamine solution, control the weight ratio of dopamine to carbon fiber to be (1.2 - 2):1, react at 20 - 40 °C for 6 - 12 h, filter and wash to obtain the polydopamine-modified carbon fiber.

[0024] By adopting the above technical solution, the carbon fiber has good stability, and is modified in a weakly alkaline environment, and the alkaline solution has little effect on the performance of the carbon fiber. Under this weight ratio and reaction conditions, polydopamine can form a relatively firm self-polymerized layer on the surface of the carbon fiber, which can effectively improve the distribution of the carbon fiber in the polyphenylene sulfide.

[0025] Preferably, the weight ratio of dopamine to carbon fiber is (1.6 - 1.8):1.

[0026] By adopting the above technical solution, controlling the weight ratio of dopamine to carbon fiber makes the film layer thickness on the surface of the carbon fiber moderate, which can not only fully coat the carbon fiber, but also reduce the adhesion between the polydopamine-modified carbon fibers and reduce the possibility of agglomeration of the polydopamine-modified carbon fibers.

[0027] Optionally, the preparation method of the modified hyperbranched polyolefin is as follows:

[0028] Mix hydroxyl-terminated butadiene and fluoroacrylate in a weight ratio of 1:(0.045 - 0.072), add a catalyst and then carry out casting, and then obtain the modified hyperbranched polyolefin through curing and crushing.

[0029] By adopting the above technical solution, controlling the weight ratio of hydroxyl-terminated polybutadiene and fluoroacrylate within a suitable range enables as many carbon-carbon double bonds as possible to react, improves the degree of branching of the modified hyperbranched polyolefin, improves the processing performance of polyphenylene sulfide, and enables the polydopamine-modified carbon fibers to be fully dispersed.

[0030] Preferably, the hydroxyl value of the hydroxyl-terminated polybutadiene is 0.70 mmol / g.

[0031] By adopting the above technical solution, the hydroxyl value of the hydroxyl-terminated polybutadiene is moderate, and the higher the number-average molecular weight of the hydroxyl-terminated polybutadiene, the lower its hydroxyl value; therefore, controlling the hydroxyl value of the hydroxyl-terminated polybutadiene within a suitable range enables the hydroxyl-terminated polybutadiene to neither affect the introduction of fluorine-containing groups nor affect the dispersion of the polydopamine-modified carbon fibers.

[0032] Preferably, the fluorinated acrylate is one or more of perfluoroalkyl ethyl methacrylate, 2-(perfluorobutyl)ethyl methacrylate, and 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate.

[0033] By adopting the above technical solution, the fluorinated acrylate includes but is not limited to 2-(perfluorododecyl)ethyl acrylate, 2-(perfluorobutyl)ethyl acrylate, perfluoroalkyl ethyl methacrylate, etc.; compared with 2-(perfluorododecyl)ethyl acrylate, 2-(perfluorobutyl)ethyl acrylate, perfluoroalkyl ethyl methacrylate, 2-(perfluorobutyl)ethyl methacrylate, and 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate have a moderate fluorine chain length and are more stable, which helps to improve the mechanical properties of the modified carbon fiber-polyphenylene sulfide composite material.

[0034] More preferably, the fluorinated acrylate is 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate.

[0035] By adopting the above technical solution, 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate also contains a hydroxyl group, which can further improve the dispersibility of the polydopamine-modified carbon fiber, and at the same time is beneficial to the fluorine-containing group to play a better shielding role on the phenyl group of polyphenylene sulfide.

[0036] Optionally, the weight ratio of the polyphenylene sulfide to the polydopamine-modified carbon fiber is 1:(0.5 - 0.6).

[0037] Optionally, the weight ratio of the polyphenylene sulfide to the modified hyperbranched polyolefin is 1:(0.6 - 0.8).

[0038] By adopting the above technical solution, the compatibility of the polyphenylene sulfide, the polydopamine-modified carbon fiber, and the modified hyperbranched polyolefin reaches the best within this weight ratio range, and can make the mechanical properties, wear resistance, and weather resistance of the modified carbon fiber-polyphenylene sulfide composite material reach the best.

[0039] Optionally, the auxiliary agent is an antioxidant and / or a light stabilizer.

[0040] The types of the antioxidant include but are not limited to aromatic amine types and hindered phenol types;

[0041] The types of the light stabilizer mainly include o-hydroxybenzophenone types, benzotriazole types, salicylic acid ester types, triazine types, substituted acrylonitrile types, etc.

[0042] In summary, the present application has at least the following beneficial effects:

[0043] In this application, polydopamine-modified carbon fiber and modified hyperbranched polyolefin are used as modifiers to form a layer of polydopamine film on the surface of the carbon fiber, making it difficult for the carbon fiber to disperse on the surface of polyphenylene sulfide. At the same time, the hydroxyl group contained at one end of the modified hyperbranched polyolefin plays a bridging role to promote the dispersion of polydopamine-modified carbon fiber, additives and other substances in polyphenylene sulfide. The uniformly dispersed polydopamine-modified carbon fiber can effectively enhance the toughness of polyphenylene sulfide, and in the case of high addition amounts, it is not easy to form stress concentration points in polyphenylene sulfide. Both the mechanical properties and wear resistance of polyphenylene sulfide can be significantly improved. Secondly, fluorocarbon bonds are introduced into the modified hyperbranched polyolefin. The combination between fluorine and carbon is firm and they are closely packed on the outer layer of the carbon skeleton, which can effectively prevent the exposure of carbon atoms and the carbon-carbon main chain, and can effectively improve the weather resistance of polyphenylene sulfide. Detailed implementation mode

[0044] The present application will be further described in detail below with reference to preparation examples, examples and comparative examples.

[0045] Unless otherwise specified, the raw materials used in the examples of this application are as follows.

[0046] Polyphenylene sulfide: grade 1140A6;

[0047] Carbon fiber: chopped carbon fiber, grade: Toray T700;

[0048] Hydroxyl-terminated polybutadiene:

[0049] Type I: number average molecular weight 3.8×10 3 ~4.6×10 3 , hydroxyl value 0.48 mmol / g;

[0050] Type III: number average molecular weight 3.0×10 3 ~3.6×10 3 , hydroxyl value 0.70 mmol / g;

[0051] Type IV: number average molecular weight 2.7×10 3 ~3.0×10 3 , hydroxyl value 0.80 mmol / g;

[0052] Preparation example of polydopamine-modified carbon fiber

[0053] Preparation example 1

[0054] A kind of polydopamine-modified carbon fiber is made according to the following steps:

[0055] Measure anhydrous ethanol and deionized water according to a volume ratio of 4:9 and mix the two to obtain an ethanol aqueous solution;

[0056] Put 2 kg of carbon fiber into an ethanol aqueous solution and ultrasonically vibrate for 15 min, then dry for later use;

[0057] Weigh 2.4 kg of dopamine, add it to deionized water, and prepare a dopamine aqueous solution with a concentration of 5 g / L; adjust the pH to 8.5 with Tris-HCl to obtain a dopamine buffer solution;

[0058] Add the carbon fiber to the dopamine buffer solution, and react at 20 °C for 12 h under magnetic stirring. Then filter, wash with deionized water 3 times, and vacuum dry at 40 °C to obtain dopamine-modified carbon fiber.

[0059] Preparation Examples 2 - 5

[0060] A poly-dopamine modified carbon fiber, the difference from Preparation Example 1 is that: the weight ratio of dopamine to carbon fiber is different, and the specific weight ratios are as follows:

[0061] In Preparation Example 2, the weight ratio of carbon fiber to dopamine is 1:1.6;

[0062] In Preparation Example 3, the weight ratio of carbon fiber to dopamine is 1:1.8;

[0063] In Preparation Example 4, the weight ratio of carbon fiber to dopamine is 1:2.4;

[0064] In Preparation Example 5, the weight ratio of carbon fiber to dopamine is 1:1.

[0065] Preparation Example 6

[0066] A poly-dopamine modified carbon fiber, the difference from Preparation Example 3 is that: add the carbon fiber to the dopamine buffer solution, and react at 40 °C for 6 h under magnetic stirring. Then filter, wash with deionized water 3 times, and vacuum dry at 40 °C to obtain dopamine-modified carbon fiber.

[0067] Preparation Examples of Modified Hyperbranched Polyolefins

[0068] Preparation Example a

[0069] A modified hyperbranched polyolefin is prepared according to the following preparation method:

[0070] Take 10 kg of hydroxyl-terminated polybutadiene (Type I) and heat it to 80 °C, then keep it warm for later use;

[0071] Take 45 g of 2-(perfluorododecyl)ethyl acrylate and heat it to 80 °C, then keep it warm for later use;

[0072] Put hydroxyl-terminated polybutadiene (Type I) and 2-(perfluorododecyl)ethyl acrylate into an extruder, then add 0.04 g of catalyst potassium persulfate, mix and pour, and control the pouring temperature at 80 °C; send the poured material to a curing room for curing, with a curing temperature of 80 °C and a curing time of 96 h; take out the cured modified hyperbranched polyolefin and send it to a low-noise crusher for crushing, so that the particle size of the crushed product is evenly controlled within 10 mm.

[0073] Preparation Examples b - d

[0074] A modified hyperbranched polyolefin, the difference from Preparation Example a is that the weight ratio of hydroxyl-terminated polybutadiene to 2-(perfluorododecyl)ethyl acrylate is different, and the specific weight ratios are as follows:

[0075] In Preparation Example b, the weight ratio of carbon fiber to dopamine is 1:0.072;

[0076] In Preparation Example c, the weight ratio of carbon fiber to dopamine is 1:0.1;

[0077] In Preparation Example d, the weight ratio of carbon fiber to dopamine is 1:0.002.

[0078] Preparation Examples e - f

[0079] A modified hyperbranched polyolefin, the difference from Preparation Example b is that: the hydroxyl value of the used hydroxyl-terminated polybutadiene is different, and the specific types are as follows:

[0080] In Preparation Example e, hydroxyl-terminated polybutadiene Type III is used to replace hydroxyl-terminated polybutadiene Type I in equal weight portions;

[0081] In Preparation Example f, hydroxyl-terminated polybutadiene Type IV is used to replace hydroxyl-terminated polybutadiene Type I in equal weight portions.

[0082] Preparation Examples g - i

[0083] A modified hyperbranched polyolefin, the difference from Preparation Example e is that: the used is different, and the specific types are as follows:

[0084] In Preparation Example g, perfluoroalkyl ethyl methacrylate is used to replace 2-(perfluorododecyl)ethyl acrylate in equal weight;

[0085] In Preparation Example h, 2-(perfluorobutyl)ethyl methacrylate is used to replace 2-(perfluorododecyl)ethyl acrylate in equal weight;

[0086] In Preparation Example i, 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate is used to replace 2-(perfluorododecyl)ethyl acrylate in equal weight portions. Examples

[0087] Example 1

[0088] A modified carbon fiber-polyphenylene sulfide composite material is prepared according to the following steps:

[0089] Take 3 kg of polyphenylene sulfide, 1 kg of polydopamine-modified carbon fiber prepared in Preparation Example 1, 1.5 kg of modified hyperbranched polyolefin prepared in Preparation Example a, and 0.01 kg of light stabilizer 622, mix them evenly in a high-speed mixer to obtain a premix; the mixing time is 4 min, and the premix is put into a twin-screw extruder for melt mixing and pelletizing to obtain the modified carbon fiber-polyphenylene sulfide composite material.

[0090] Examples 2-14

[0091] A modified carbon fiber-polyphenylene sulfide composite material, the difference from Example 1 is that the sources of the polydopamine-modified carbon fiber and the modified hyperbranched polyolefin are different, as shown in Table 1 below:

[0092] Table 1. Sources of polydopamine-modified carbon fiber and modified hyperbranched polyolefin

[0093]

[0094] Examples 15-21

[0095] A modified carbon fiber-polyphenylene sulfide composite material, the difference from Example 14 is that the addition amounts of each component are different, as shown in Table 2 below:

[0096] Table 2. Addition amounts of each component of the modified carbon fiber-polyphenylene sulfide composite material

[0097] Composition / kg Example 14 Example 15 Example 16 Example 17 Polyphenylene sulfide 3 3 3 3 Polydopamine-modified carbon fiber 1 1.5 1.8 2 Modified hyperbranched polyolefin 1.5 1.5 1.5 1.5 Antioxidant Basf1010 / / / / Light stabilizer 622 0.01 0.01 0.01 0.01 Composition / kg Example 18 Example 19 Example 20 Example 21 Polyphenylene sulfide 3 3 3 5 Polydopamine-modified carbon fiber 1.8 1.8 1.8 2 Modified hyperbranched polyolefin 1.8 2.4 3 3 Antioxidant Basf1010 / / / 0.025 Light stabilizer 622 0.01 0.01 0.01 0.025

[0098] Comparative examples

[0099] Comparative Example 1

[0100] A modified carbon fiber-polyphenylene sulfide composite material, the difference from Example 1 is that the composition is different: in this comparative example, carbon fiber is used to replace the polydopamine-modified carbon fiber in equal weight.

[0101] Comparative Example 2

[0102] A modified carbon fiber-polyphenylene sulfide composite material, the difference from Example 1 is that the composition is different: in this comparative example, polytetrafluoroethylene (number average molecular weight of 80,000) is used to replace the modified hyperbranched polyolefin in equal weight.

[0103] Performance detection test

[0104] The modified carbon fiber-polyphenylene sulfide composite materials prepared in Examples 1-21 and Comparative Examples 1-2 are extruded, and 1×10 cm long strip samples are cut according to the standard for the following detections:

[0105] Mechanical properties: The tensile strength was tested according to Standard ISO 527-1. The toughness was tested according to Standard ISO 179.

[0106] Wear resistance: With reference to the method of GB / T 3690 (300 N load, 2 m / s friction rate, friction for 2 h), the wear resistance of the wear-resistant materials provided in the above examples and comparative examples was tested. Among them, the life refers to the wear resistance time (unit: h) of the sample to be tested when the wear amount is 1000 mg.

[0107] Weather resistance: The long strip samples were immersed in nitric acid with a concentration of 45 wt% for detection;

[0108] Grade A: No swelling or dissolution phenomenon, and no defects such as pits appear on the surface after wiping;

[0109] Grade B: Slight swelling and dissolution occur, and very few tiny pits and other defects appear on the surface after wiping; Grade C: Slight swelling and dissolution occur, and some tiny pits and other defects appear on the surface after wiping; Grade D: Obvious swelling and dissolution occur, and obvious pits and other defects appear on the surface after wiping.

[0110] Test results

[0111] Table 3. Performance test results of Examples 1-21 and Comparative Examples 1-2

[0112]

[0113]

[0114] Note: " / " indicates that the test was not carried out.

[0115] Combined with Example 1 and Comparative Examples 1-2 and Table 3, it can be seen that:

[0116] In Comparative Example 1, only traditional carbon fiber was used to modify polyphenylene sulfide. The compatibility between traditional carbon fiber and modified hyperbranched polyolefin and polyphenylene sulfide was poor, resulting in a tensile strength of only 245 MPa and the notched impact strength was increased to 12.85 / J·m- 1 , and the improvement of its mechanical properties was limited. Similarly, the improvement of wear amount, service life and friction coefficient was not obvious.

[0117] In Comparative Example 2, the same fluorine-containing polytetrafluoroethylene was used instead of the modified hyperbranched polyolefin, and the compatibility between polytetrafluoroethylene and polydopamine-modified carbon fiber was poor, resulting in a weak improvement effect on the mechanical properties and wear resistance of the modified carbon fiber-polyphenylene sulfide composite material.

[0118] In Example 1, polydopamine-modified carbon fiber and modified hyperbranched polyolefin were used simultaneously. There was a synergistic effect between the two in modifying polyphenylene sulfide, which could significantly improve the mechanical properties, wear resistance, and weather resistance of the polyphenylene sulfide material. Compared with the blank control group, the tensile strength of the modified carbon fiber-polyphenylene sulfide composite prepared in Example 1 increased by 93 MPa, and the notch impact strength increased by 4.87 / J·m- 1 ; the wear amount decreased significantly, and the friction resistance was excellent. At the same time, it could also have excellent weather resistance and good tolerance to strong acids.

[0119] Combined with Examples 1-5 and Table 3, it can be seen that in this application, when the weight ratio of carbon fiber to dopamine was controlled to be 1:1.8, the modified effect of the obtained polydopamine-modified carbon fiber added to polyphenylene sulfide was relatively good.

[0120] Combined with Examples 3, 7-14 and Table 3, it can be seen that in this application, when hydroxyl-terminated polybutadiene type III and 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate were selected as raw materials, and the prepared modified hyperbranched polyolefin was added to polyphenylene sulfide, it could significantly improve the mechanical properties and wear resistance of polyphenylene sulfide.

[0121] This specific embodiment is only an interpretation of this application, and it is not a limitation of this application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of this application, they are protected by the patent law.

Claims

1. A modified carbon fiber-polyphenylene sulfide composite material, characterized in that: It is made from raw materials including the following parts by weight: Polyphenylene sulfide 30 - 50 parts; Polydopamine-modified carbon fiber 10 - 20 parts; Modified hyperbranched polyolefin 15 - 30 parts; Auxiliary agent 0.1 - 0.5 part; The polydopamine-modified carbon fiber has a carbon fiber as the core and polydopamine as the shell; The modified hyperbranched polyolefin is made from hydroxyl-terminated polybutadiene and fluorinated acrylate, and the hydroxyl value of the hydroxyl-terminated polybutadiene is 0.70 mmol / g; The preparation method of the modified hyperbranched polyolefin is as follows: Mix hydroxyl-terminated polybutadiene and fluorinated acrylate according to a weight ratio of 1:(0.045 - 0.072), add a catalyst and then carry out casting, and then obtain the modified hyperbranched polyolefin through curing, crushing, and extrusion.

2. A modified carbon fiber-polyphenylene sulfide composite material according to claim 1, characterized in that The preparation method of the polydopamine-modified carbon fiber includes the following steps: Prepare an aqueous dopamine solution, adjust the pH value of the aqueous dopamine solution to 8 - 8.5, immerse the carbon fiber in the aqueous dopamine solution, control the weight ratio of dopamine to carbon fiber to be (1.2 - 2.0):1, react at 20 - 40 °C for 6 - 12 h, filter and wash to obtain the polydopamine-modified carbon fiber.

3. A modified carbon fiber-polyphenylene sulfide composite material according to claim 2, characterized in that: The weight ratio of dopamine to carbon fiber is (1.6 - 1.8):

1.

4. A modified carbon fiber-polyphenylene sulfide composite material according to claim 1, characterized in that: The fluorinated acrylate is one or more of perfluoroalkyl ethyl methacrylate, 2-(perfluorobutyl)ethyl methacrylate, 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate.

5. A modified carbon fiber-polyphenylene sulfide composite material according to claim 1, characterized in that: The fluorinated acrylate is 3-(perfluoro-5-methylhexyl)-2-hydroxypropyl methacrylate.

6. A modified carbon fiber-polyphenylene sulfide composite material according to claim 1, characterized in that: The weight ratio of polyphenylene sulfide to polydopamine-modified carbon fiber is 1:(0.5 - 0.6).

7. A modified carbon fiber-polyphenylene sulfide composite material according to claim 1, characterized in that: The weight ratio of polyphenylene sulfide to modified hyperbranched polyolefin is 1:(0.6 - 0.8).

8. A modified carbon fiber-polyphenylene sulfide composite material according to claim 1, characterized in that: The auxiliary agent is an antioxidant and / or a light stabilizer.

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