CN110564056A - Carbon fiber reinforced PP-PA6 composite material and preparation method thereof - Google Patents
Carbon fiber reinforced PP-PA6 composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a carbon fiber reinforced PP-PA6 composite material and a preparation method thereof, wherein the preparation method comprises the following steps: (1) carrying out desizing treatment, extraction and electrochemical treatment on the carbon fiber in sequence, and then carrying out surface amination treatment to obtain modified carbon fiber; (2) adding PA6 into a main feeding port of a double-screw extruder, adding modified carbon fiber from a side feeding port, and extruding and granulating to obtain modified carbon fiber/PA 6 master batches; (3) and mixing the modified carbon fiber/PA 6 master batch with polypropylene resin, a compatilizer and an antioxidant, and then putting the mixture into a double-screw extruder for extrusion and granulation to obtain the carbon fiber reinforced PP-PA6 composite material. The modified carbon fiber prepared by the method has good surface activity, can improve the surface wettability of the carbon fiber, can be well dispersed in a PP/PA6 composite material, and improves the mechanical property of the composite material. The preparation method has simple process and can be used for industrial production.
Description
Technical Field
The invention relates to the technical field of carbon fiber reinforced thermoplastic composite materials, in particular to a carbon fiber reinforced PP-PA6 composite material and a preparation method thereof.
Background
In recent years, carbon fiber reinforced thermoplastic composite materials are widely applied and developed, have the characteristics of light weight, high strength, high production efficiency, recycling and the like, can be used for manufacturing products by adopting processes of injection molding, die pressing and the like, can gradually replace partial metal materials in the field of automobiles at present, and greatly reduce weight and cost of the automobiles while ensuring the safety and usability of the automobiles.
The carbon fiber reinforced PA6 composite material has excellent mechanical strength, heat resistance and fatigue resistance, but has the defects of high water absorption rate, reduced material strength after water absorption and the like, and the cost of the composite material is far higher than that of a carbon fiber reinforced polypropylene material. In the preparation process of the carbon fiber reinforced polypropylene (PP) composite material, the compatibility between polypropylene and a carbon fiber matrix is poor, and even under the condition of adding a compatilizer, the compatibility between the polypropylene and the carbon fiber matrix is difficult to be completely improved, so that the performance of the composite material is poor. Domestic published patent number 104098838A: the high-performance PP/PA6 alloy material and the preparation method thereof adopt the modified nano chromium sesquioxide to promote the heterogeneous nucleation of PP, thereby ensuring that the crystallization of PP is more complete to improve the mechanical property of the PP/PA6 alloy material, but the mechanical property of the product is far lower than that of a carbon fiber reinforced PP/PA6 composite material.
Therefore, in order to overcome the defects of poor compatibility and uneven dispersion of carbon fibers and a resin matrix in the carbon fiber reinforced PP/PA6 composite material, further research needs to be strengthened, and a carbon fiber reinforced PP/PA6 composite material with simple process, good carbon fiber dispersion and excellent mechanical properties needs to be developed.
Disclosure of Invention
The invention aims to provide a carbon fiber reinforced PP-PA6 composite material and a preparation method thereof, and aims to solve the problems in the prior art.
The purpose of the invention is realized by the following technical scheme:
A preparation method of a carbon fiber reinforced PP-PA6 composite material comprises the following steps:
(1) Preparing modified carbon fibers: carrying out desizing treatment, extraction and electrochemical treatment on the carbon fiber in sequence, and then carrying out surface amination treatment to prepare modified carbon fiber;
(2) Preparing modified carbon fiber/PA 6 master batch: drying PA6 and putting into a main feeding port of a double-screw extruder; adding modified carbon fibers from a side feeding port of a double-screw extruder, and performing extrusion granulation to obtain modified carbon fiber/PA 6 master batches;
(3) Stirring and mixing the modified carbon fiber/PA 6 master batch, polypropylene resin (PP), a compatilizer and an antioxidant, putting the mixture into a double-screw extruder, and carrying out melting, extrusion granulation, water cooling, grain cutting and drying to obtain the carbon fiber reinforced PP-PA6 composite material.
Further, in the step (1), the type of the carbon fiber is one of T300 and T700.
In the further scheme, in the step (1), the desizing treatment is carried out at the temperature of 400-600 ℃ for 10-30 min; the extraction solvent used for extraction is acetone, the extraction temperature is 60-80 ℃, and the extraction time is 2-8 h; after extraction is finished, washing the carbon fibers by using deionized water and then drying;
In a further scheme, in the step (1), the electrochemical treatment method comprises the following steps: applying anode voltage on the carbon fiber, applying cathode voltage on the bottom of the treatment tank, performing electrochemical treatment for 1-3min under the condition of current intensity of 1-3A with electrolyte selected from sodium chloride, potassium sulfate, sodium bicarbonate, sodium hypochlorite and ammonium salt, washing with water, and drying.
in a further scheme, in the step (1), the method for performing surface amination treatment comprises the following steps: mixing carbon fiber, p-aminobenzoic acid and polyphosphoric acid, heating to 110-150 ℃, stirring to react for 3-5h under an inert atmosphere, adding phosphorus pentoxide, continuously reacting for 24-72h, washing with water and drying to obtain modified carbon fiber; wherein the mass ratio of the carbon fiber, the p-aminobenzoic acid, the polyphosphoric acid and the phosphorus pentoxide is as follows: (2-8): (2-8): (8-10): (2-10).
in a further scheme, in the step (3), the compatilizer is one or more of an ethylene copolymer of glycidyl methacrylate and maleic anhydride, an ethylene copolymer of glycidyl methacrylate and ethylene methyl acrylate, and an ethylene copolymer of glycidyl methacrylate and ethylene vinyl acetate.
In a further scheme, in the step (3), the antioxidant is a mixture of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and tris (2, 4-di-tert-butylphenyl) phosphite in a mass ratio of 2: 1.
According to a further scheme, the components are as follows according to the mass portion: 50-75 parts of polypropylene resin, 10-50 parts of PA6 resin, 0.01-10 parts of compatilizer, 0.01-10 parts of antioxidant and 5-40 parts of modified carbon fiber.
Further, in the step (3), the temperatures of the zones in the twin-screw extruder are respectively as follows: the temperature of the first zone is 70-100 ℃, the temperature of the second zone is 120-260 ℃, the temperature of the third zone is 170-260 ℃, the temperature of the fourth zone is 170-260 ℃, the temperature of the fifth zone is 170-260 ℃, the temperature of the sixth zone is 170-260 ℃, the temperature of the seventh zone is 170-260 ℃, and the temperature of the eighth zone is 170-260 ℃; the head temperature of the double-screw extruder is 170-260 ℃; the screw rotating speed of the double-screw extruder is 180-300 r/min.
The invention also aims to provide the carbon fiber reinforced PP-PA6 composite material prepared by the preparation method.
Compared with the prior art, the invention has the beneficial effects that:
(1) The method firstly desizes the carbon fiber, extracts the carbon fiber with acetone, performs surface amination after electrochemical treatment, is favorable for increasing the existence of surface unsaturated carbon atoms, can improve the surface activity of the carbon fiber, is favorable for improving the infiltration effect of PP/PA6 and the carbon fiber, can enable the carbon fiber to be well dispersed in the PP/PA6 composite material, improves the interface bonding strength of the composite material, and improves the mechanical property of the PP/PA6 composite material.
(2) The modified carbon fiber/PA 6 master batch is prepared firstly, and then is blended and extruded with PP, so that the compatibility of the carbon fiber and the PP can be effectively improved, and the preparation method is simple in process and can be used for industrial production.
(3) The ethylene copolymer added with glycidyl methacrylate and maleic anhydride is used as a compatilizer, so that the compatibility of PP and PA6 is improved, carbon fibers are dispersed in a PP/PA6 composite material more uniformly, and the high-strength carbon fiber reinforced PP/PA6 composite material is obtained.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The manufacturers and the types of part of the raw materials used in the following examples are respectively: ethylene copolymer of glycidyl methacrylate and maleic anhydride, Sumitomo corporation, BF-7M; ethylene copolymers of glycidyl methacrylate and ethylene methyl acrylate, xiamenco eisi plastics science and technology ltd, E001; ethylene copolymers of glycidyl methacrylate and ethylene vinyl acetate, good easy compatibilisers Jiangsu Co., Ltd; polypropylene resin (PP), shenhuaning coal group ltd, homopolymer PP 1100N.
The antioxidant used in the following examples was pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] mixed with tris (2, 4-di-tert-butylphenyl) phosphite in a mass ratio of 2: 1.
Example 1
(1) putting the T300 finished carbon fiber into a desizing furnace for 10min under the protection of nitrogen, wherein the temperature of the desizing furnace is 400 ℃; taking out, putting into a snake-shaped fat extractor, condensing and refluxing for 2h by using acetone, taking out, washing the carbon fiber for 3 times by using deionized water at the water bath temperature of 60 ℃, drying in a vacuum drying oven at the temperature of 80 ℃ for 4h, and taking out; adding anode voltage to the carbon fiber, adding cathode voltage to the bottom of the treatment tank, introducing 1A current, taking out the electrolyte which is sodium bicarbonate for 2min, cleaning, and drying at 100 deg.C; 200g of the carbon fiber, 200g of P-aminobenzoic acid and 800g of polyphosphoric acid (PPA) are put into a three-neck flask and heated to 110 ℃, stirred and reacted for 3 hours, then 200g of phosphorus pentoxide (P205) is added, and the reaction is continued for 24 hours, wherein all the reactions are carried out under the protection of nitrogen. And taking out the carbon fiber, washing the carbon fiber by using deionized water, and drying the carbon fiber by using an oven to obtain the modified carbon fiber.
(2) Drying and drying PA6 at 80 ℃ for 12 hours, and putting 80 parts of PA6 into a main feeding port of a double-screw extruder; and (2) putting 20 parts of the modified carbon fiber in the step (1) into a side feeding port of a double-screw extruder, and performing extrusion granulation to obtain the modified carbon fiber/PA 6 master batch.
(3) And (3) stirring 25 parts of the carbon fiber/PA 6 master batch in the step (2), 70 parts of polypropylene resin (PP), 4.7 parts of ethylene copolymer of glycidyl methacrylate and maleic anhydride and 0.3 part of antioxidant for 10 minutes by a high-speed mixer according to the proportion to form a mixture, putting the mixture into a hopper of a double-screw extruder, and carrying out melting, extrusion granulation, water cooling, granulation and drying to obtain the product. Wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of a first area is 70 ℃, the temperature of a second area is 150 ℃, the temperature of a third area is 200 ℃, the temperature of a fourth area is 220 ℃, the temperature of a fifth area is 230 ℃, the temperature of a sixth area is 230 ℃, the temperature of a seventh area is 220 ℃, the temperature of an eighth area is 220 ℃ and the temperature of a machine head is 220 ℃; the screw speed is 230 r/min.
Example 2
(1) putting the T700 finished carbon fiber into a desizing furnace for 30min under the protection of nitrogen, wherein the temperature of the desizing furnace is 600 ℃; taking out, putting into a snake-shaped fat extractor, condensing and refluxing for 8h by using acetone, taking out, washing the carbon fiber for 5 times by using deionized water at the water bath temperature of 80 ℃, drying in a vacuum drying oven at the temperature of 120 ℃ for 6h, and taking out; adding anode voltage to the carbon fiber, adding cathode voltage to the bottom of the treatment tank, introducing 3A current to obtain sodium chloride as electrolyte, taking out for 3min, cleaning, and drying at 150 deg.C; taking 800g of the carbon fiber, 800g of P-aminobenzoic acid and 1000g of polyphosphoric acid (PPA), putting the carbon fiber, 800g of P-aminobenzoic acid and 1000g of polyphosphoric acid (PPA) into a three-neck flask, heating to 150 ℃, stirring to react for 5 hours, then adding 1000g of phosphorus pentoxide (P205), and continuing to react for 72 hours, wherein all reactions are under the protection of nitrogen. And taking out the carbon fiber, washing the carbon fiber by using deionized water, and drying the carbon fiber by using an oven to obtain the modified carbon fiber.
(2) Drying and drying PA6 at 100 ℃ for 10 hours, and putting 70 parts of PA6 into a main feeding port of a double-screw extruder; and (2) adding 30 parts of the modified carbon fiber in the step (1) into a side feeding port of a double-screw extruder, and performing extrusion granulation to obtain modified carbon fiber/PA 6 master batches.
(3) and (3) stirring 25 parts of the carbon fiber/PA 6 master batch in the step (2), 70 parts of polypropylene resin (PP), 4.7 parts of ethylene copolymer of glycidyl methacrylate and ethylene methyl acrylate and 0.3 part of antioxidant for 12 minutes by a high-speed mixer according to the proportion to form a mixture, putting the mixture into a hopper of a double-screw extruder, and carrying out melting, extrusion granulation, water cooling, granulation and drying to obtain the product. Wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of the first zone is 80 ℃, the temperature of the second zone is 150 ℃, the temperature of the third zone is 190 ℃, the temperature of the fourth zone is 220 ℃, the temperature of the fifth zone is 230 ℃, the temperature of the sixth zone is 230 ℃, the temperature of the seventh zone is 230 ℃, the temperature of the eighth zone is 220 ℃ and the temperature of the head is 230 ℃; the screw rotation speed is 180 r/min.
example 3
(1) Putting the T700 finished carbon fiber into a desizing furnace for 30min under the protection of nitrogen, wherein the temperature of the desizing furnace is 500 ℃; taking out, putting into a snake-shaped fat extractor, condensing and refluxing for 8h by using acetone, taking out, washing the carbon fiber for 5 times by using deionized water at the water bath temperature of 80 ℃, drying in a vacuum drying oven at the temperature of 120 ℃ for 6h, and taking out; adding anode voltage to the carbon fiber, adding cathode voltage to the bottom of the treatment tank, introducing 3A current to obtain electrolyte potassium sulfate, taking out for 3min, cleaning, and drying at 150 deg.C; 300g of the carbon fiber, 300g of P-aminobenzoic acid and 1000g of polyphosphoric acid (PPA) are put into a three-neck flask and heated to 130 ℃, stirred and reacted for 5 hours, then 1000g of phosphorus pentoxide (P205) is added, and the reaction is continued for 60 hours, wherein all the reactions are under the protection of nitrogen. Taking out the carbon fiber, washing the carbon fiber with deionized water, and drying the carbon fiber in a drying oven to obtain modified carbon fiber;
(2) Drying and drying PA6 at 100 ℃ for 10 hours, and putting 60 parts of PA6 into a main feeding port of a double-screw extruder; and (2) putting 40 parts of the modified carbon fiber in the step (1) into a side feeding port of a double-screw extruder, and performing extrusion granulation to obtain the modified carbon fiber/PA 6 master batch.
(3) And (3) stirring 25 parts of the carbon fiber/PA 6 master batch in the step (2), 70 parts of polypropylene resin (PP), 4.7 parts of ethylene copolymer of glycidyl methacrylate and ethylene vinyl acetate and 0.3 part of antioxidant for 15 minutes by a high-speed mixer according to the proportion to form a mixture, putting the mixture into a hopper of a double-screw extruder, and carrying out melting, extrusion granulation, water cooling, granulation and drying to obtain the product. Wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of a first area is 70 ℃, the temperature of a second area is 170 ℃, the temperature of a third area is 200 ℃, the temperature of a fourth area is 220 ℃, the temperature of a fifth area is 230 ℃, the temperature of a sixth area is 230 ℃, the temperature of a seventh area is 220 ℃, the temperature of an eighth area is 220 ℃ and the temperature of a machine head is 230 ℃; the screw rotation speed is 300 r/min.
Example 4
(1) Putting the T300 finished carbon fiber into a desizing furnace for 20min under the protection of nitrogen, wherein the temperature of the desizing furnace is 500 ℃; taking out, putting into a snake-shaped fat extractor, condensing and refluxing for 2h by using acetone, taking out, washing the carbon fiber for 3 times by using deionized water at the water bath temperature of 60 ℃, drying in a vacuum drying oven at the temperature of 80 ℃ for 4h, and taking out; adding anode voltage to the carbon fiber, adding cathode voltage to the bottom of the treatment tank, introducing 2A current, taking out sodium hypochlorite as electrolyte for 2min, cleaning, and drying at 100 deg.C; 200g of the carbon fiber, 200g of P-aminobenzoic acid and 900g of polyphosphoric acid (PPA) are taken and put into a three-neck flask to be heated to 130 ℃, stirred and reacted for 3 hours, then 500g of phosphorus pentoxide (P205) is added and reacted for 48 hours at 130 ℃, and all the reactions are carried out under the protection of nitrogen. And taking out the carbon fiber, washing the carbon fiber by using deionized water, and drying the carbon fiber by using an oven to obtain the modified carbon fiber.
(2) Drying and drying PA6 at 120 ℃ for 12 hours, and putting 60 parts of PA6 into a main feeding port of a double-screw extruder; and (2) putting 40 parts of the modified carbon fiber in the step (1) into a side feeding port of a double-screw extruder, and performing extrusion granulation to obtain the modified carbon fiber/PA 6 master batch.
(3) mixing 35 parts of the carbon fiber/PA 6 master batch in the step (2) with 60 parts of polypropylene resin (PP), 4.7 parts of ethylene copolymer of glycidyl methacrylate and maleic anhydride and 0.3 part of antioxidant in a ratio by a high-speed mixer for 15 minutes to form a mixture, putting the mixture into a hopper of a double-screw extruder, and carrying out melting, extrusion granulation, water cooling, granulation and drying to obtain the product. Wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of a first area is 70 ℃, the temperature of a second area is 190 ℃, the temperature of a third area is 220 ℃, the temperature of a fourth area is 230 ℃, the temperature of a fifth area is 230 ℃, the temperature of a sixth area is 220 ℃, the temperature of a seventh area is 220 ℃, the temperature of an eighth area is 220 ℃ and the temperature of a machine head is 230 ℃; the screw rotation speed is 260 r/min.
Example 5
(1) Putting the T700 finished carbon fiber into a desizing furnace for 15min under the protection of nitrogen, wherein the temperature of the desizing furnace is 450 ℃; taking out, putting into a snake-shaped fat extractor, condensing and refluxing for 6h by using acetone, taking out, washing the carbon fiber for 5 times by using deionized water at the water bath temperature of 80 ℃, drying in a vacuum drying oven at the temperature of 100 ℃ for 4h, and taking out; adding anode voltage to the carbon fiber, adding cathode voltage to the bottom of the treatment tank, introducing 3A current, taking out sodium bicarbonate as electrolyte for 3min, cleaning, and drying at 150 deg.C; 200g of the carbon fiber, 200g of P-aminobenzoic acid and 1000g of polyphosphoric acid (PPA) are put into a three-neck flask and heated to 130 ℃, stirred and reacted for 5 hours, then 1000g of phosphorus pentoxide (P205) is added, and the reaction is continued for 60 hours, wherein all the reactions are under the protection of nitrogen. Taking out the carbon fiber, washing the carbon fiber with deionized water, and drying the carbon fiber in a drying oven to obtain modified carbon fiber;
(2) Drying and drying PA6 at 100 ℃ for 8 hours, and putting 60 parts of PA6 into a main feeding port of a double-screw extruder; and (2) putting 40 parts of the modified carbon fiber in the step (1) into a side feeding port of a double-screw extruder, and performing extrusion granulation to obtain the modified carbon fiber/PA 6 master batch.
(3) And (3) stirring 45 parts of the carbon fiber/PA 6 master batch in the step (2), 50 parts of polypropylene resin (PP), 4.7 parts of ethylene copolymer of glycidyl methacrylate and maleic anhydride and 0.3 part of antioxidant for 10 minutes by a high-speed mixer according to the proportion to form a mixture, putting the mixture into a hopper of a double-screw extruder, and carrying out melting, extrusion granulation, water cooling, granulation and drying to obtain the product. Wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of a first area is 70 ℃, the temperature of a second area is 180 ℃, the temperature of a third area is 220 ℃, the temperature of a fourth area is 230 ℃, the temperature of a fifth area is 230 ℃, the temperature of a sixth area is 220 ℃, the temperature of a seventh area is 220 ℃, the temperature of an eighth area is 220 ℃ and the temperature of a machine head is 230 ℃; the screw rotation speed is 200 r/min.
Comparative example 1
Drying and drying PA6 at 100 ℃ for 8 hours, stirring 25 parts of PA6, 70 parts of polypropylene resin, 4.7 parts of ethylene copolymer of glycidyl methacrylate and maleic anhydride and 0.3 part of antioxidant for 15 minutes by a high-speed mixer to form a mixture, putting the mixture into a hopper of a double-screw extruder, and carrying out melting, extrusion granulation, water cooling, granulation and drying to obtain the product. Wherein the temperature and the screw rotating speed of each area of the double-screw extruder are respectively as follows: the temperature of a first area is 70 ℃, the temperature of a second area is 170 ℃, the temperature of a third area is 200 ℃, the temperature of a fourth area is 230 ℃, the temperature of a fifth area is 230 ℃, the temperature of a sixth area is 230 ℃, the temperature of a seventh area is 230 ℃, the temperature of an eighth area is 230 ℃ and the temperature of a machine head is 230 ℃; the screw rotation speed is 200 r/min.
the PP/PA6 composite materials prepared in examples 1-5 and comparative example 1 were tested for tensile strength, flexural strength and flexural modulus, respectively, according to the relevant test standards, and the test standards and product performance data are shown in Table 1 below:
TABLE 1 Performance testing of the products of the examples
| test standard | unit of | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example 1 | |
| Tensile strength | ISO 527 | MPa | 58.5 | 69.7 | 64.1 | 74.9 | 76.2 | 47.9 |
| Bending strength | ISO178 | MPa | 61.7 | 63.8 | 65.5 | 76.3 | 79.7 | 50.3 |
| Flexural modulus | ISO178 | MPa | 3680 | 4216 | 4758 | 5335 | 5869 | 2820 |
Note: the specific conditions for the above test are as follows:
Tensile bars for testing tensile strength were 1A type dumbbell specimens of type (170.0 ± 5.0) mm (20.0 ± 0.2) mm (4.0 ± 0.2) mm at a tensile rate of 20 mm/min;
Bending sample bars tested for bending strength were (80 ± 5.0) mm (10.0 ± 0.5) mm (4.0 ± 0.2) mm, bending rate 20 mm/min;
the flexural specimen model for the flexural modulus was (80 ± 5.0) mm (10.0 ± 0.5) mm (4.0 ± 0.2) mm, the flexural rate was 20 mm/min;
as can be seen from the comparison of the data in the table, the modified carbon fiber reinforced PP/PA6 composite materials in examples 1-5 of the present invention have greatly increased tensile strength, bending strength and bending modulus compared with the PP/PA6 composite material without carbon fiber in comparative example 1. The surface wettability of the carbon fiber can be improved through modification treatment, so that the carbon fiber is well dispersed in the PP/PA6 composite material, the interface bonding strength of the composite material is improved, and the mechanical property of the PP/PA6 composite material is improved. Therefore, the application field of the carbon fiber reinforced PP/PA6 composite material is greatly expanded, and the method has very important practical significance.
Claims (10)
1. A preparation method of a carbon fiber reinforced PP-PA6 composite material is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing modified carbon fibers: carrying out desizing treatment, extraction and electrochemical treatment on the carbon fiber in sequence, and then carrying out surface amination treatment to prepare modified carbon fiber;
(2) Preparing modified carbon fiber/PA 6 master batch: drying PA6 and putting into a main feeding port of a double-screw extruder; adding modified carbon fibers from a side feeding port of a double-screw extruder, and performing extrusion granulation to obtain modified carbon fiber/PA 6 master batches;
(3) Stirring and mixing the modified carbon fiber/PA 6 master batch, the polypropylene resin, the compatilizer and the antioxidant, putting the mixture into a double-screw extruder, and carrying out melting, extrusion granulation, water cooling, grain cutting and drying to obtain the carbon fiber reinforced PP-PA6 composite material.
2. The method of claim 1, wherein: in the step (1), the type of the carbon fiber is one of T300 and T700.
3. the preparation method of the carbon fiber composite material according to claim 1 is characterized in that in the step (1), the desizing treatment is carried out at the temperature of 400 ~ 600 ℃ for 10 ~ 30min, the extraction solvent is acetone, the extraction temperature is 60 ~ 80 ℃ for 2 ~ 8h, and after the extraction is finished, the carbon fiber is cleaned by deionized water and then dried.
4. The method of claim 1, wherein: in the step (1), the electrochemical treatment method comprises the following steps: applying anode voltage on the carbon fiber, applying cathode voltage on the bottom of the treatment tank, performing electrochemical treatment for 1-3min under the condition of current intensity of 1-3A with electrolyte selected from sodium chloride, potassium sulfate, sodium bicarbonate, sodium hypochlorite and ammonium salt, washing with water, and drying.
5. the method of claim 1, wherein: in the step (1), the method for surface amination treatment comprises the following steps: mixing carbon fiber, p-aminobenzoic acid and polyphosphoric acid, heating to 110-150 ℃, stirring to react for 3-5h under an inert atmosphere, adding phosphorus pentoxide, continuously reacting for 24-72h, washing with water and drying to obtain modified carbon fiber; wherein the mass ratio of the carbon fiber, the p-aminobenzoic acid, the polyphosphoric acid and the phosphorus pentoxide is as follows: (2-8): (2-8): (8-10): (2-10).
6. The method of claim 1, wherein: in the step (3), the compatilizer is at least one of an ethylene copolymer of glycidyl methacrylate and maleic anhydride, an ethylene copolymer of glycidyl methacrylate and ethylene methyl acrylate, and an ethylene copolymer of glycidyl methacrylate and ethylene vinyl acetate.
7. The method of claim 1, wherein: in the step (3), the antioxidant is a mixture of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tris (2, 4-di-tert-butylphenyl) phosphite in a mass ratio of 2: 1.
8. The method of claim 1, wherein: the components are as follows according to the mass portion: 50-75 parts of polypropylene resin, 10-50 parts of PA6 resin, 0.01-10 parts of compatilizer, 0.01-10 parts of antioxidant and 5-40 parts of modified carbon fiber.
9. The method of claim 1, wherein: in the step (3), the temperature of each zone in the double-screw extruder is respectively as follows: the temperature of the first zone is 70-100 ℃, the temperature of the second zone is 120-260 ℃, the temperature of the third zone is 170-260 ℃, the temperature of the fourth zone is 170-260 ℃, the temperature of the fifth zone is 170-260 ℃, the temperature of the sixth zone is 170-260 ℃, the temperature of the seventh zone is 170-260 ℃, and the temperature of the eighth zone is 170-260 ℃; the head temperature of the double-screw extruder is 170-260 ℃; the screw rotating speed of the double-screw extruder is 180-300 r/min.
10. A carbon fiber reinforced PP-PA6 composite material produced by the production method according to any one of claims 1 to 9.
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| CN113603971A (en) * | 2021-09-01 | 2021-11-05 | 苏州禾润昌新材料有限公司 | High-strength polypropylene composite material and preparation method thereof |
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