Carbon fiber reinforced polypropylene composite and method for producing the same

Abstract

The present application relates to the technical field of carbon fiber reinforced polypropylene composite material, and discloses a carbon fiber reinforced polypropylene composite material and a preparation method thereof.The components for preparing the carbon fiber reinforced polypropylene composite material include polypropylene, carbon fiber, a compatibilizer and an initiator, and the amount of the carbon fiber is 3-35 parts by weight, the amount of the compatibilizer is 1-15 parts by weight, and the amount of the initiator is 0.05-0.75 parts by weight, relative to 100 parts by weight of the polypropylene; wherein the compatibilizer contains an ionic liquid, and the ionic liquid is selected from one or more of imidazole ionic liquid, imidazole cation and anion.The compatibilizer used in the present application can make the carbon fiber and the polypropylene well compatible, and the compatibilizer has a toughening effect, which can improve the impact resistance, tensile strength and bending modulus of the carbon fiber reinforced polypropylene composite material.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber reinforced polypropylene composite materials, and specifically to a carbon fiber reinforced polypropylene composite material and its preparation method. Background Technology

[0002] Polypropylene is a thermoplastic resin produced by polymerizing propylene. It is widely used in the automotive, pharmaceutical, and home appliance industries due to its abundant and inexpensive raw material sources, excellent processing performance, and superior mechanical properties. Carbon fiber, on the other hand, possesses advantages such as high strength, low density, high temperature resistance, water resistance, and corrosion resistance. It can serve as an excellent reinforcing material, significantly improving the performance of thermoplastic resins and expanding their applications.

[0003] However, because polypropylene itself is a non-polar material with weak interaction with the carbon fiber surface, their compatibility is poor. Therefore, current methods mainly employ carbon fiber surface modification and the addition of compatibilizers to enhance their bonding ability. Traditional compatibilizers for grafted polymers such as PP-MAH and POE-MAH have insufficient compatibility; thus, modification methods are used.

[0004] CN102181155B discloses a method for preparing polytetrafluoroethylene and functionalized carbon fiber modified polyimide resin composites; CN107254065A discloses a method for preparing organic amine-TiO2 nanowire / carbon fiber multi-scale reinforcements; and CN105063999A discloses a method for in-situ growth of polyamide amines on carbon fiber surfaces and controllable iteration number hyperbranching. All of these methods modify carbon fibers through strong oxidation, involving large amounts of strong oxidants such as concentrated sulfuric acid and potassium permanganate. This not only makes process control difficult but also imposes extremely high requirements on equipment and environmental protection.

[0005] CN114213751B discloses a carbon fiber reinforced polypropylene composite material and its preparation method, and CN109679207B discloses a carbon fiber reinforced polypropylene composite material and its preparation method and application. The above methods all use modified carbon fibers, which are relatively cumbersome and not conducive to the preparation of carbon fiber reinforced polypropylene.

[0006] Therefore, a convenient, fast, controllable, and efficient method for preparing carbon fiber reinforced polypropylene is urgently needed. Summary of the Invention

[0007] The purpose of this invention is to overcome the defects of poor compatibility between polypropylene and carbon fiber in the prior art, as well as the defects of cumbersome methods for modifying carbon fiber in the prior art. This invention provides a carbon fiber reinforced polypropylene composite material and its preparation method. The compatibilizer used in this invention enables good compatibility between carbon fiber and polypropylene, and the compatibilizer has a toughening effect, which can improve the impact resistance, tensile strength and flexural modulus of the carbon fiber reinforced polypropylene composite material.

[0008] To achieve the above objectives, a first aspect of the present invention provides a carbon fiber reinforced polypropylene composite material, wherein the components for preparing the carbon fiber reinforced polypropylene composite material include polypropylene, carbon fiber, a compatibilizer, and an initiator, and the amount of carbon fiber is 3-35 parts by weight relative to 100 parts by weight of the polypropylene, the amount of the compatibilizer is 1-15 parts by weight, and the amount of the initiator is 0.05-0.75 parts by weight; wherein the compatibilizer is selected from ionic liquids, and the ionic liquids are selected from one or more of imidazole ionic liquids, imidazole cations, and anions.

[0009] The second aspect of the present invention provides a method for preparing a carbon fiber reinforced polypropylene composite material, wherein the preparation method includes: melting and granulating polypropylene, carbon fiber, compatibilizer and initiator in a twin-screw extruder to obtain a carbon fiber reinforced polypropylene composite material.

[0010] A third aspect of the present invention provides a carbon fiber reinforced polypropylene composite material prepared by the preparation method described above.

[0011] Through the above technical solution, the compatibilizer used in this invention enables good compatibility between carbon fiber and polypropylene, and the compatibilizer has a toughening effect, which can improve the impact resistance of carbon fiber reinforced polypropylene composites. Furthermore, because the compatibilizer in this invention has good compatibility with organic, inorganic, and polymeric materials, other resins or toughening agents can be added to make the material have even better performance. Detailed Implementation

[0012] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0013] As previously stated, the first aspect of the present invention provides a carbon fiber reinforced polypropylene composite material, wherein the components for preparing the carbon fiber reinforced polypropylene composite material include polypropylene, carbon fiber, compatibilizer, and initiator, and the amount of carbon fiber is 3-35 parts by weight relative to 100 parts by weight of the polypropylene, the amount of compatibilizer is 1-15 parts by weight, and the amount of initiator is 0.05-0.75 parts by weight; wherein the compatibilizer is selected from ionic liquids, and the ionic liquids are selected from one or more of imidazole ionic liquids, imidazole cations, and anions.

[0014] According to the present invention, preferably, the amount of carbon fiber is 5-35 parts by weight relative to 100 parts by weight of the polypropylene, the amount of compatibilizer is 1-15 parts by weight, and the amount of initiator is 0.25-0.75 parts by weight; more preferably, the amount of carbon fiber is 10-35 parts by weight relative to 100 parts by weight of the polypropylene, the amount of compatibilizer is 10-15 parts by weight, and the amount of initiator is 0.25-0.75 parts by weight.

[0015] The inventors of this invention discovered that polypropylene, being a non-polar material, has weak interaction with the surface of carbon fibers, resulting in poor compatibility. On one hand, existing methods for modifying the surface of carbon fibers are difficult to control and involve complex processes. On the other hand, existing technologies using traditional compatibilizers, such as maleic anhydride-grafted polypropylene, maleic anhydride-grafted ethylene-octene, or maleic anhydride-grafted ethylene-vinyl acetate, exhibit poor compatibility. To address these shortcomings, the inventors of this invention employ a specific compatibilizer, preferably an ionic liquid compatibilizer. Its excellent compatibility enables good compatibility between carbon fibers and polypropylene, and the ionic liquid also has a toughening effect, improving the product's impact resistance. Furthermore, because the ionic liquid exhibits good compatibility with organic, inorganic, and polymeric materials, other resins or toughening agents can be added to enhance the material's properties.

[0016] According to the present invention, the polypropylene is selected from one or more of homopolymer polypropylene, block copolymer polypropylene, and random copolymer polypropylene, preferably polypropylene. In the present invention, the polypropylene is of type M700R.

[0017] According to the present invention, the carbon fiber can be polyacrylonitrile-based carbon fiber. In the present invention, the carbon fiber can be SCF40S24K, wherein SCF indicates that it is made of 30T high-grade carbon fiber material from Toray Industries, Japan; 40s indicates that the yarn is 40s ply; the K number of carbon fiber refers to the number of monofilaments in the carbon fiber yarn. For example, 1K indicates that a bundle of fiber yarn contains 1000 monofilaments, and 24K indicates that a bundle of fiber yarn contains 24×1000 monofilaments.

[0018] According to the present invention, in a preferred embodiment, the amount of carbon fiber is 5-35 parts by weight relative to 100 parts by weight of the polypropylene, the amount of compatibilizer is 1-15 parts by weight, and the amount of initiator is 0.05-0.75 parts by weight.

[0019] According to the present invention, the compatibilizer may also be a mixture of an ionic liquid and at least one of maleic anhydride-grafted polypropylene, maleic anhydride-grafted ethylene-1-octene copolymer, and maleic anhydride-grafted ethylene-vinyl acetate copolymer. The weight ratio of the ionic liquid to at least one of maleic anhydride-grafted polypropylene (PP-MAH), maleic anhydride-grafted ethylene-1-octene copolymer (POE-MAH), and maleic anhydride-grafted ethylene-vinyl acetate copolymer may be 1:(0.5-2).

[0020] According to the present invention, the imidazole ionic liquid is selected from at least one of 1-butyl-3-methylimidazolium bromide, 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium dibutyl phosphate, 1-(3-amino-3-oxypropyl)-3-(2-amino-2-oxyethyl)-imidazolium tetrafluoroborate and 1-(3-amino-3-oxypropyl)-3-(2-amino-2-oxyethyl)-imidazolium dibutyl phosphate.

[0021] According to the present invention, the imidazole cation has the structure shown in formula (I);

[0022]

[0023] Among them, R1, R2, R3, R4 and R5 may be the same or different, and each is selected from at least one of hydrogen, substituted groups or unsubstituted groups;

[0024] Wherein, the group (the substituted group or the unsubstituted group) includes C1-C1 groups. 20 Alkyl, aromatic, C3-C 10 Heterocyclic, C3-C 10 cycloalkyl, C3-C 10 Heterocyclic C1-C8 alkyl, aromatic C1-C8 alkyl, heterocyclic aromatic and heterocyclic aromatic C l At least one of the -C8 alkyl groups;

[0025] Wherein, the substituents in the substituted groups include at least one of one or two halogens, nitro, trifluoromethyl, trifluoromethoxy, methoxy, carboxyl, -NH2, -OH, -SH, -NHCH3, -N(CH3)2, cyano, -SO3H and -P(O)(OC(1-5))2.

[0026] According to the present invention, in addition to being selected from the above-mentioned groups, R4 and R5 may also be the same or different, and may be selected from the following groups respectively:

[0027]

[0028] At least one of them;

[0029] Where a = 0 - 10, b = 0 - 10;

[0030] The R' group is selected from C1-C. 20 Alkyl, aromatic, C3-C 10 Heterocyclic, C3-C 10 cycloalkyl, C3-C 10 Heterocyclic C1-C8 alkyl, aromatic C1-C8 alkyl, heterocyclic aromatic and heterocyclic aromatic C l At least one of the -C8 alkyl groups. In this invention, it should be noted that, for example, C3-C... 10 Heterocyclic C1-C8 alkyl groups refer to a series of groups that indicate the length of the carbon chain.

[0031] According to the present invention, the anion is selected from one or more of the following: halide ions, hydroxyl, mercapto, cyanide inorganic ions, acetate ions, trifluoroacetate ions, dicyandiamide ions, sulfonate ions, tetrafluoroborate ions, hexafluorophosphate ions, phosphate ester anions, sulfonate ester anions, and bis(trifluoromethylsulfonyl)imide ions.

[0032] According to the present invention, the initiator is selected from one or more of dicumyl peroxide, benzoyl peroxide, and AIBN (azobisisobutyronitrile).

[0033] According to the present invention, the components for preparing the carbon fiber reinforced polypropylene composite material further include an antioxidant, and the amount of the antioxidant relative to 100 parts by weight of the polypropylene is 0.3-0.5 parts by weight, preferably 0.3-0.4 parts by weight, and more preferably 0.3 parts by weight.

[0034] According to the present invention, the notched impact strength of the simply supported beam of the carbon fiber reinforced polypropylene composite material is 2-7 KJ / m. 2 The tensile strength is 30-110 MPa, and the flexural modulus is 1-9 MPa; preferably, the notched impact strength of the simply supported beam of the carbon fiber reinforced polypropylene composite material is 2.7-6.4 KJ / m. 2 The tensile strength is 35.1-108.6 MPa, and the flexural modulus is 1.7-8.2 MPa; more preferably, the notched impact strength of the simply supported beam of the carbon fiber reinforced polypropylene composite material is 6.1-6.4 KJ / m. 2The tensile strength is 101.3-108.6 MPa, and the flexural modulus is 7.5-8.2 MPa.

[0035] The second aspect of the present invention provides a method for preparing a carbon fiber reinforced polypropylene composite material, wherein the preparation method includes: melting and granulating polypropylene, carbon fiber, compatibilizer and initiator in a twin-screw extruder to obtain a carbon fiber reinforced polypropylene composite material.

[0036] According to the present invention, the preparation method further includes: melting and granulating polypropylene, carbon fiber, compatibilizer, initiator and antioxidant in a twin-screw extruder to prepare carbon fiber reinforced polypropylene composite material.

[0037] In this invention, it should be noted that the polypropylene, carbon fiber, compatibilizer, initiator and antioxidant are the same as those described above, and will not be repeated here.

[0038] According to the present invention, polypropylene, compatibilizer, initiator and antioxidant are mixed in a high-speed mixer for 3-5 minutes; in the present invention, after the polypropylene, compatibilizer, initiator and antioxidant are mixed, they are placed in the main feed barrel of a twin-screw extruder.

[0039] According to the present invention, carbon fibers are introduced from the fiber inlet.

[0040] According to the present invention, the melt blending extrusion granulation temperature is 190-230°C.

[0041] A third aspect of the present invention provides a carbon fiber reinforced polypropylene composite material prepared by the preparation method described above.

[0042] The present invention will be described in detail below through embodiments.

[0043] In the following examples and comparative examples:

[0044] (1) The components involved in this invention are shown in Table 1.

[0045] Table 1

[0046]

[0047] (2) Use an injection molding machine to prepare the composite material into standard test specimens and test its notched impact strength of simply supported beams according to ISO 179 standard.

[0048] (3) Use an injection molding machine to prepare the composite material into standard test strips and test its tensile strength according to ISO 527-2 standard.

[0049] (4) Use an injection molding machine to prepare the composite material into standard test specimens and test its flexural modulus according to ISO 178:2001.

[0050] Example 1

[0051] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0052] The components for preparing carbon fiber reinforced polypropylene composites include: 1 part by mass of imidazole ionic liquid 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 100 parts by mass of polypropylene particles, 0.3 parts of 1010 antioxidant, 0.05 parts of initiator benzoyl peroxide, and 10 parts by mass of carbon fiber.

[0053] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0054] One part by weight of imidazole ionic liquid 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.05 parts by weight of benzoyl peroxide initiator were mixed in a high-speed mixer and then fed into a twin-screw main feeder. Ten parts by weight of carbon fiber (SCF40S24K) were fed in through the fiber inlet. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to obtain carbon fiber reinforced polypropylene composite material for later use.

[0055] Example 2

[0056] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0057] The components for preparing carbon fiber reinforced polypropylene composites include: 5 parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate and 100 parts by weight of polypropylene particles, 0.3 parts by weight of 1010 antioxidant, 0.25 parts by weight of benzoyl peroxide, and 10 parts by weight of carbon fiber.

[0058] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0059] Five parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.25 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fibers entered through the fiber inlet, with a corresponding weight of 10 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to obtain carbon fiber reinforced polypropylene composite material for later use.

[0060] Example 3

[0061] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0062] The components for preparing carbon fiber reinforced polypropylene composites include: 5 parts by mass of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate and 100 parts by mass of polypropylene particles, 0.3 parts by mass of 1010 antioxidant, 0.25 parts by mass of benzoyl peroxide, and 20 parts by mass of carbon fiber.

[0063] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0064] Five parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.25 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fibers entered through the fiber inlet, with a corresponding weight of 20 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to prepare carbon fiber reinforced polypropylene composite material for later use.

[0065] Example 4

[0066] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0067] The components for preparing carbon fiber reinforced polypropylene composites include: 10 parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate and 100 parts by weight of polypropylene particles, 0.3 parts by weight of 1010 antioxidant, 0.75 parts by weight of benzoyl peroxide, and 20 parts by weight of carbon fiber.

[0068] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0069] Ten parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.75 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fibers entered through the fiber inlet, with a corresponding mass of 20 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to obtain carbon fiber reinforced polypropylene composite material for later use.

[0070] Example 5

[0071] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0072] The components for preparing carbon fiber reinforced polypropylene composites include: 15 parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate and 100 parts by weight of polypropylene particles, 0.3 parts by weight of 1010 antioxidant, 0.75 parts by weight of benzoyl peroxide, and 35 parts by weight of carbon fiber.

[0073] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0074] 15 parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.75 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fibers entered through the fiber inlet, with a corresponding mass of 35 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to prepare carbon fiber reinforced polypropylene composite material for later use.

[0075] Example 6

[0076] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0077] The components for preparing carbon fiber reinforced polypropylene composites include: 15 parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate and 90 parts by weight of polypropylene particles, 0.3 parts of 1010 antioxidant, 0.75 parts of benzoyl peroxide, and 5 parts by weight of carbon fiber.

[0078] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0079] 15 parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 90 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.75 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fibers entered through the fiber inlet, with a corresponding weight of 5 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to obtain carbon fiber reinforced polypropylene composite material for later use.

[0080] Example 7

[0081] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0082] The components for preparing carbon fiber reinforced polypropylene composites include: 15 parts by weight of 1-(3-amino-3-oxypropyl)-3-(2-amino-2-oxyethyl)-imidazolium dibutyl phosphate, 100 parts by weight of polypropylene particles, 0.3 parts by weight of 1010 antioxidant, 0.75 parts by weight of benzoyl peroxide, and 35 parts by weight of carbon fiber.

[0083] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0084] 15 parts by weight of 1-(3-amino-3-oxypropyl)-3-(2-amino-2-oxyethyl)-imidazolium dibutyl phosphate, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.75 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fibers entered through the fiber inlet, with a corresponding mass of 35 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to prepare carbon fiber reinforced polypropylene composite material for later use.

[0085] Example 8

[0086] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0087] The components for preparing carbon fiber reinforced polypropylene composites include: 5 parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate and 100 parts by weight of polypropylene particles, 0.3 parts by weight of 1010 antioxidant, 0.25 parts by weight of benzoyl peroxide, and 35 parts by weight of carbon fiber.

[0088] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0089] Five parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.25 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fibers entered through the fiber inlet, with a corresponding weight of 35 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to prepare carbon fiber reinforced polypropylene composite material for later use.

[0090] Example 9

[0091] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0092] The components for preparing carbon fiber reinforced polypropylene composites include: 10 parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, 5 parts by weight of PP-MAH and 100 parts by weight of polypropylene particles, 0.3 parts by weight of 1010 antioxidant, 0.25 parts by weight of benzoyl peroxide and 35 parts by weight of carbon fiber.

[0093] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0094] Ten parts by weight of 1-vinyl-3-(2-amino-2-oxyethyl-)imidazolium tetrafluoroborate, five parts by weight of PP-MAH, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.25 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fiber entered through the fiber inlet, with a corresponding mass of 35 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to prepare carbon fiber reinforced polypropylene composite material for later use.

[0095] Example 10

[0096] This embodiment is intended to illustrate the carbon fiber reinforced polypropylene composite material prepared according to the present invention.

[0097] The components for preparing carbon fiber reinforced polypropylene composites include: 15 parts by weight of 1-butyl-3-methylimidazolium bromide and 100 parts by weight of polypropylene particles, 0.3 parts of 1010 antioxidant, 0.75 parts of benzoyl peroxide, and 35 parts by weight of carbon fiber.

[0098] Methods for preparing carbon fiber reinforced polypropylene composites include:

[0099] 15 parts by weight of 1-butyl-3-methylimidazolium bromide, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.75 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fibers entered through the fiber inlet, with a corresponding mass of 35 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to prepare carbon fiber reinforced polypropylene composite material for later use.

[0100] Comparative Example 1

[0101] 15 parts by weight of PP-MAH, 100 parts by weight of polypropylene granules, 0.3 parts by weight of 1010 antioxidant, and 0.75 parts by weight of benzoyl peroxide were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fiber entered through the fiber inlet, with a corresponding mass of 35 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to prepare carbon fiber reinforced polypropylene composite material for later use.

[0102] Comparative Example 2

[0103] 100 parts by weight of polypropylene granules and 0.3 parts by weight of 1010 antioxidant were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fiber entered through the fiber inlet, with a corresponding mass of 35 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to obtain carbon fiber reinforced polypropylene composite material for later use.

[0104] Comparative Example 3

[0105] 15 parts by weight of POE-MAH, 100 parts by weight of polypropylene granules, and 0.3 parts by weight of 1010 antioxidant were mixed in a high-speed mixer and then fed into a twin-screw main feeder. The corresponding carbon fiber entered through the fiber inlet, with a corresponding mass of 35 parts by weight. The twin-screw temperature was 190-230℃. The mixture was then extruded and granulated to prepare carbon fiber reinforced polypropylene composite material for later use.

[0106] Comparative Example 4

[0107] PP material is used.

[0108] Test case

[0109] The carbon fiber reinforced polypropylene composites prepared in Examples 1-10 and Comparative Examples 1-4 were subjected to performance tests, and the results are shown in Table 2.

[0110] Table 2

[0111]

[0112] The data results show that ionic liquids, as compatibilizers, can effectively improve the bonding ability between carbon fiber and PP.

[0113] The performance of Example 7 is slightly lower than that of Example 5. This is due to the different ionic liquid structures. Example 7 lacks vinyl groups, meaning no vinyl groups can be grafted onto PP via free radical polymerization, potentially resulting in a slightly weaker performance. Furthermore, the free ionic liquid acts as a plasticizer, leading to a decrease in strength. Example 10 is even lower because the substituents lack the ability to form hydrogen bonds, resulting in weaker bonding with nylon.

[0114] In Comparative Example 1, POE-MAH exhibited the best impact resistance because POE itself is a good elastomer and bonds well with PP, resulting in strong impact resistance. However, compared to the performance of corresponding carbon fiber composites, such as in Examples 5 and 7, the strength improvement was not as strong as that achieved with ionic liquid as a compatibilizer (Examples 5 and 7).

[0115] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A carbon fiber reinforced polypropylene composite material, characterized in that, The components for preparing the carbon fiber reinforced polypropylene composite material include polypropylene, carbon fiber, compatibilizer, and initiator. Relative to 100 parts by weight of the polypropylene, the amount of carbon fiber is 3-35 parts by weight, the amount of compatibilizer is 1-15 parts by weight, and the amount of initiator is 0.05-0.75 parts by weight. The compatibilizer comprises an ionic liquid, selected from one or more of imidazole ionic liquids, imidazole cations, and anions.

2. The carbon fiber reinforced polypropylene composite material according to claim 1, wherein, The compatibilizer comprises a mixture of an ionic liquid and at least one of maleic anhydride-grafted polypropylene, maleic anhydride-grafted ethylene-1-octene copolymer, and maleic anhydride-grafted ethylene-vinyl acetate copolymer. Preferably, the weight ratio of the ionic liquid to at least one of maleic anhydride-grafted polypropylene, maleic anhydride-grafted ethylene-1-octene copolymer, and maleic anhydride-grafted ethylene-vinyl acetate copolymer is 1:(0.5-2).

3. The carbon fiber reinforced polypropylene composite material according to claim 1, wherein, The imidazole ionic liquid is selected from at least one of 1-butyl-3-methylimidazolium bromide, 1-vinyl-3-(2-amino-2-oxoethyl-)imidazolium tetrafluoroborate, 1-vinyl-3-(2-amino-2-oxoethyl-)imidazolium dibutyl phosphate, 1-(3-amino-3-oxopropyl)-3-(2-amino-2-oxoethyl)-imidazolium tetrafluoroborate and 1-(3-amino-3-oxopropyl)-3-(2-amino-2-oxoethyl)-imidazolium dibutyl phosphate.

4. The carbon fiber reinforced polypropylene composite material according to claim 1, wherein, The imidazole cation has the structure shown in formula (I); Among them, R1, R2, R3, R4 and R5 may be the same or different, and each is selected from at least one of hydrogen, substituted groups or unsubstituted groups; Wherein, the group is selected from C1-C 20 Alkyl, aromatic, C3-C 10 Heterocyclic, C3-C 10 cycloalkyl, C3-C 10 Heterocyclic C1-C8 alkyl, aromatic C1-C8 alkyl, heterocyclic aromatic and heterocyclic aromatic C l At least one of the -C8 alkyl groups; Wherein, the substituents in the substituted groups are selected from at least one of one or two halogens, nitro, trifluoromethyl, trifluoromethoxy, methoxy, carboxyl, -NH2, -OH, -SH, -NHCH3, -N(CH3)2, cyano, -SO3H and -P(O)(OC(1-5))2.

5. The carbon fiber reinforced polypropylene composite material according to claim 1 or 4, wherein, R4 and R5 may be the same or different, each selected from: At least one of them; Where a = 0 - 10, b = 0 - 10; The R' group is selected from C1-C. 20 Alkyl, aromatic, C3-C 10 Heterocyclic, C3-C 10 cycloalkyl, C3-C 10 Heterocyclic C1-C8 alkyl, aromatic C1-C8 alkyl, heterocyclic aromatic and heterocyclic aromatic C l At least one of the -C8 alkyl groups.

6. The carbon fiber reinforced polypropylene composite material according to claim 1, wherein, The anion is selected from one or more of the following: halide ions, hydroxyl, mercapto, cyanide inorganic ions, acetate ions, trifluoroacetate ions, dicyandiamide ions, sulfonate ions, tetrafluoroborate ions, hexafluorophosphate ions, phosphate ester anions, sulfonate ester anions, and bis(trifluoromethylsulfonyl)imide ions.

7. The carbon fiber reinforced polypropylene composite material according to claim 1, wherein, The initiator is selected from one or more of dicumyl peroxide, benzoyl peroxide, and AIBN.

8. The carbon fiber reinforced polypropylene composite material according to claim 1, wherein, The components used to prepare the carbon fiber reinforced polypropylene composite material also include an antioxidant, and the amount of the antioxidant is 0.3-0.5 parts by weight relative to 100 parts by weight of the polypropylene.

9. The carbon fiber reinforced polypropylene composite material according to any one of claims 1-8, wherein, The notched impact strength of the carbon fiber reinforced polypropylene composite material in a simply supported beam is 2-7 KJ / m. 2 The tensile strength is 30-110 MPa, and the flexural modulus is 1-9 MPa.

10. A method for preparing a carbon fiber reinforced polypropylene composite material, characterized in that, The preparation method includes: melting and granulating polypropylene, carbon fiber, compatibilizer and initiator in a twin-screw extruder to prepare carbon fiber reinforced polypropylene composite material.

11. The preparation method according to claim 10, wherein, The preparation method further includes: melting and granulating polypropylene, carbon fiber, compatibilizer, initiator and antioxidant in a twin-screw extruder to prepare carbon fiber reinforced polypropylene composite material.

12. The preparation method according to claim 10 or 11, wherein, The conditions for melt extrusion include a temperature of 190-230℃.

13. A carbon fiber reinforced polypropylene composite material prepared by the preparation method according to any one of claims 10-12.

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