CN110041700B - Carbon fiber reinforced nylon material, preparation raw material, preparation method and application thereof - Google Patents
Carbon fiber reinforced nylon material, preparation raw material, preparation method and application thereof Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/06—Polyamides derived from polyamines and polycarboxylic acids
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2479/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
Abstract
The invention belongs to the field of plastic composite materials, and particularly relates to a carbon fiber reinforced nylon material, a preparation raw material, a preparation method and application thereof. The carbon fiber reinforced nylon material is prepared from raw materials including nylon, carbon fibers, an isocyanate compound with a functional group of 2, polycarbodiimide, an antioxidant and a lubricant, wherein the carbon fibers are carbon fibers with surfaces coated with polyurethane, the weight ratio of the nylon to the carbon fibers to the isocyanate compound with the functional group of 2 to the polycarbodiimide is (25-160): 10-80): 1-10): 1, and the isocyanate compound with the functional group of 2 is independently stored. The carbon fiber reinforced nylon material prepared by the raw materials and the method provided by the invention has excellent fatigue resistance, mechanical strength and heat resistance.
Description
Technical Field
The invention belongs to the field of plastic composite materials, and particularly relates to a carbon fiber reinforced nylon material, a preparation raw material, a preparation method and application thereof.
Background
The carbon fiber reinforced nylon material has extremely high specific strength, self-lubricating property and chemical corrosion resistance, is widely applied to industries such as mechanical industry, transportation, electronic and electric appliances and the like, and is often used as a lightweight material to replace a metal material to manufacture parts subjected to complex stress such as mechanical gears, transmission connecting rods, structural supports and the like due to good mechanical strength and extremely low density. These parts are subject to repeated alternating stresses under normal operating conditions and are most likely to break well below the yield or fracture strength of the material.
Research and development about material fatigue strength are concentrated on metal materials, the internal structure of the metal materials is uneven due to crystallization and impurity distribution, so that stress transmission is unbalanced, tiny cracks are formed in local high-stress areas, stress concentration areas are formed at the tops of the tiny cracks, and the cracks are continuously expanded under the action of alternating stress until unstable fracture. The fracture mechanism of plastic composites is more complex than that of metal materials. Firstly, the metal is a single-phase system, and the influence of two phases and an interface on the composite material is not required to be considered; second, the working temperature of the metal is much lower than the melting point, the strength of the metal does not deform at the working temperature, the working temperature of the plastic may be higher than the glass transition temperature of the plastic itself, and the plastic may creep and stress relax under normal working conditions.
At present, in order to improve the fatigue strength of the carbon fiber reinforced nylon material, the prior art mainly adds a POE-G-MAH compatilizer and the like. However, the fatigue strength of the carbon fiber reinforced nylon material is improved in this way, only the interface of two phases is considered, and the influence of the compatilizer on the mechanical strength and the reduction of the heat-resistant temperature of the carbon fiber reinforced nylon material is not considered, that is, the obtained material cannot have both excellent fatigue strength and mechanical strength and can maintain a higher heat-resistant temperature.
Disclosure of Invention
The invention aims to overcome the defects that the existing carbon fiber reinforced nylon material cannot have excellent fatigue resistance and mechanical strength and can not keep high heat resistance temperature by adding a compatilizer, and provides a carbon fiber reinforced nylon material which can have excellent fatigue resistance and mechanical strength and can keep high heat resistance temperature, a preparation raw material, a preparation method and application thereof.
The carbon fiber reinforced nylon material is prepared from nylon, carbon fibers, an isocyanate compound with a functional group of 2, polycarbodiimide, an antioxidant and a lubricant, wherein the carbon fibers are carbon fibers with surfaces coated with polyurethane, the weight ratio of the nylon to the carbon fibers to the isocyanate compound with the functional group of 2 to the polycarbodiimide is (25-160): 10-80): 1-10): 1, and the isocyanate compound with the functional group of 2 is independently stored.
Furthermore, the raw materials for preparing the carbon fiber reinforced nylon material comprise 50-80 parts by weight of nylon, 20-40 parts by weight of carbon fibers, 2-5 parts by weight of isocyanate compounds with 2 functional groups, 0.5-2 parts by weight of polycarbodiimide, 0.5-1 part by weight of antioxidant and 0.2-0.6 part by weight of lubricant.
Further, the nylon is selected from at least one of nylon 66, nylon 6, nylon 612 and nylon 12.
Further, the relative viscosity of the nylon is 2.5-3.0 under the conditions that the temperature is 40 +/-0.1 ℃ and the reference medium is 96 +/-0.15 wt% of sulfuric acid aqueous solution.
Further, the moisture content of the nylon is less than 500 ppm.
Furthermore, the carbon fibers are chopped carbon fibers with the monofilament diameter of 5-10 mu m and the length of 4-8 mm.
Further, the amount of the polyurethane coated on the surface of the carbon fiber is 1.5-3 wt%.
Further, the moisture content of the carbon fiber is less than 500 ppm.
Further, the isocyanate compound with the functional group of 2 is diphenylmethane diisocyanate and/or toluene diisocyanate.
Further, the antioxidant is a mixture of N, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine and bis (2, 4-dicumylphenyl) pentaerythritol diphosphite.
Further, the lubricant is a silicone lubricant and/or an ethylene acrylic acid copolymer.
The invention also provides a preparation method of the carbon fiber reinforced nylon material, wherein the carbon fiber reinforced nylon material takes the preparation raw materials of the carbon fiber reinforced nylon material as raw materials and the preparation method comprises the following steps:
s1, placing the nylon, the polycarbodiimide, the antioxidant and the lubricant into a low-speed mixer to be uniformly mixed to obtain a premix;
and S2, adding the premix and the carbon fibers from a main feeding port and a first side feeding port of a double-screw extruder respectively for melt blending to obtain a nylon carbon fiber blend, adding an isocyanate compound with a functional group of 2 from a second side feeding port of the double-screw extruder after melting to continue melt blending with the nylon carbon fiber blend, and then extruding the obtained melt blending product to obtain the carbon fiber reinforced nylon material.
Furthermore, the length-diameter ratio of the double-screw extruder is (36-48): 1, the extrusion temperature is 265-300 ℃, and the screw rotation speed is 350-500 r/min.
The invention also provides the carbon fiber reinforced nylon material prepared by the method.
In addition, the invention also provides application of the carbon fiber reinforced nylon material as a manufacturing material of a mechanical gear, a transmission connecting rod or a structural support.
The inventor of the invention finds out after intensive research that the stress concentration points of the carbon fiber reinforced nylon material are mainly at two ends of the internal carbon fiber, under alternating stress, the interface at the two ends of the carbon fiber is firstly debonded to generate micro cracks to further initiate stress concentration, and the isocyanate compound with the functional group of 2 and the polycarbodiimide are simultaneously added into the carbon fiber reinforced nylon material system, so that the adhesion between the carbon fiber and the plastic matrix can be improved while the mechanical strength and the high temperature resistance are kept through the synergistic cooperation of the two, the generation of the micro cracks is delayed, the fatigue strength is improved, and the service life is prolonged. The reason for this is presumed to be due to: on one hand, each molecular chain of the isocyanate compound with the functional group of 2 comprises two active functional groups, the reaction activity is high, the isocyanate compound can react with carboxyl, hydroxyl and amido on nylon and with hydroxyl on polyurethane-coated carbon fiber, the compatibility between two phases of the material is improved, so that a uniform system is obtained to keep the mechanical strength and the high temperature resistance, and the isocyanate compound is a component with two functional groups, so that the processing performance of the material is deteriorated due to the fact that a cross-linking structure is not easily formed, and the lengthened molecular chain can more effectively transfer stress; on the other hand, under a normal working state, the high-frequency alternating stress can heat the material to increase the temperature, so that the linear composite material is further subjected to high-temperature degradation, and the addition of the polycarbodiimide can improve the crack propagation resistance of the material matrix, so that the fatigue strength of the material is improved.
In addition, in the preparation method of the carbon fiber reinforced nylon material, the nylon plastic substrate and the carbon fiber are uniformly mixed at the front section of the double-screw extruder, the isocyanate compound with the functional group of 2 is added from the feeding port at the second side of the rear section of the double-screw extruder after being melted, the melt viscosity can be increased by adding the isocyanate compound with the functional group of 2 at the position, but the carbon fiber cannot be broken due to small shearing force, so that the average length of the carbon fiber is prevented from being shortened, and the mechanical property of the carbon fiber reinforced nylon material is greatly maintained.
Detailed Description
The present invention is described in detail below.
In the invention, the weight ratio of the nylon, the carbon fiber, the isocyanate compound with the functional group of 2 and the polycarbodiimide is (25-160): 10-80): 1-10): 1. In addition, the content of the antioxidant can be 0.5-1 part by weight and the content of the lubricant can be 0.2-0.6 part by weight relative to 50-80 parts by weight of the nylon. In the most preferred embodiment of the invention, the raw materials for preparing the carbon fiber reinforced nylon material comprise 50-80 parts by weight of nylon, 20-40 parts by weight of carbon fiber, 2-5 parts by weight of isocyanate compound with a functional group of 2, 0.5-2 parts by weight of polycarbodiimide, 0.5-1 part by weight of antioxidant and 0.2-0.6 part by weight of lubricant. In addition, the isocyanate compound with the functional group of 2 is required to be independently stored, namely, the isocyanate compound is stored separately from other components, so that the nylon, the carbon fiber, the polycarbodiimide, the antioxidant and the lubricant can be added at the front section in the subsequent process of preparing the carbon fiber reinforced nylon material, and the isocyanate compound with the functional group of 2 is added at the rear section, so that the obtained carbon fiber reinforced nylon material has excellent fatigue resistance, mechanical strength and heat resistance.
In the present invention, specific examples of the nylon include, but are not limited to, at least one of nylon 66, nylon 6, nylon 612, and nylon 12, with nylon 66 being particularly preferred. The relative viscosity of the nylon is preferably 2.5-3.0. In the present invention, the test temperature of the relative viscosity is 40 ℃. + -. 0.1 ℃ and the reference medium is 96. + -. 0.15 wt% aqueous sulfuric acid. Further, the moisture content of the nylon is preferably less than 500 ppm.
In the invention, the carbon fiber is preferably a chopped carbon fiber with a monofilament diameter of 5-10 μm and a length of 4-8 mm. The surface of the carbon fiber needs to be coated with polyurethane. Wherein the coating amount of the polyurethane is 1.5-3 wt%. Further, the moisture content of the carbon fiber is preferably less than 500 ppm.
In the invention, the isocyanate compound with the functional group of 2 is used as a compatilizer and a stress transfer agent, so that the mechanical strength and the high-temperature resistance are improved on one hand, the binding force between a nylon plastic matrix and carbon fibers is improved on the other hand, the generation of microcracks is delayed, the fatigue resistance is improved, and the service life is prolonged. The addition effect of the isocyanate compound with the functional group of 2 is better than that of a maleic anhydride grafted polyolefin elastomer (POE-g-MAH), the grafting rate of the POE-g-MAH is generally 1-3 wt%, the effective content of the active functional group is low, a molecular chain may contain a plurality of functional groups or has no functional group, when chemical reaction occurs, some parts may form a cross-linking structure, and some parts are POE incompatible with a nylon matrix, so that the internal unevenness of the material is increased. The isocyanate compound with the functional group of 2 has higher reactivity than a maleic acid rod, so that one end of the isocyanate compound is connected to nylon, the other end of the isocyanate compound is connected to carbon fiber to improve the compatibility between the two phases, the isocyanate compound only contains two functional groups, the length of a molecular chain is only increased, a cross-linking structure is not easily formed, the increased molecular chain can effectively transfer stress, and the fatigue resistance is improved. Specific examples of the isocyanate-based compound having the functional group of 2 include, but are not limited to: diphenylmethane diisocyanate (MDI) and/or Toluene Diisocyanate (TDI), particularly preferably diphenylmethane diisocyanate.
The type of the antioxidant is not particularly limited in the present invention, and may be any of various conventional substances capable of improving the oxidation resistance of a carbon fiber reinforced nylon material, and a mixture of N, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine (1098) and bis (2, 4-dicumylphenyl) pentaerythritol diphosphite (9228) is particularly preferable. Wherein the weight ratio of N, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine to bis (2, 4-dicumylphenyl) pentaerythritol diphosphite in the mixture is preferably (0.5-2): 1.
The present invention is not particularly limited in kind of the lubricant, and specific examples thereof include, but are not limited to: at least one of a silicone lubricant, an ethylene acrylic acid copolymer, a polyethylene wax, Ethylene Bis Stearamide (EBS), and pentaerythritol stearate, preferably a silicone lubricant and/or an ethylene acrylic acid copolymer. The silicone lubricant may be, for example, a modified high molecular weight silicone lubricant Tegomer E525. The ethylene acrylic acid copolymer may be, for example, honeywell AC 540A.
The carbon fiber reinforced nylon material provided by the invention takes the preparation raw material of the carbon fiber reinforced nylon material as the raw material and the preparation method comprises the following steps:
s1, placing the nylon, the polycarbodiimide, the antioxidant and the lubricant into a low-speed mixer to be uniformly mixed to obtain a premix;
and S2, adding the premix and the carbon fibers from a main feeding port and a first side feeding port of a double-screw extruder respectively for melt blending to obtain a nylon carbon fiber blend, adding an isocyanate compound with a functional group of 2 from a second side feeding port of the double-screw extruder after melting to continue melt blending with the nylon carbon fiber blend, and then extruding the obtained melt blending product to obtain the carbon fiber reinforced nylon material. Wherein, the main feeding port and the first side feeding port are positioned at the front section of the double-screw extruder. The second side feeding port is positioned at the rear section of the double-screw extruder and is close to the machine head. For example, when the twin screw extruder is a twin screw extruder comprising eight to ten zones, the main feeding port and the first side feeding port may be located in one zone, and the second side feeding port may be located in five or six zones. In addition, the length-diameter ratio of the double-screw extruder can be (36-48): 1, the extrusion temperature can be 265-300 ℃, and the screw rotation speed can be 350-500 r/min.
The invention also provides the carbon fiber reinforced nylon material prepared by the method.
In addition, the invention also provides application of the carbon fiber reinforced nylon material as a manufacturing material of a mechanical gear, a transmission connecting rod or a structural support.
The present invention will be described in detail below by way of examples.
Example 1
S1, drying nylon (PA66, the relative viscosity of which is 2.7 under the conditions that the temperature is 40 +/-0.1 ℃ and the reference medium is 96 +/-0.15 wt% of sulfuric acid water solution) and carbon fibers (chopped carbon fibers with the monofilament diameter of 5-10 mu m, the length of 4-8 mm and the surface coated with 1.5 wt% of polyurethane) in a blast drying oven at 100 ℃ until the moisture content is less than 500ppm for later use. Nylon 66, polycarbodiimide, antioxidant and lubricant were mixed uniformly in a low-speed blender at a speed of 400rpm (the same applies below) to obtain a premix.
S2, adding the premix from a main feeding port of one area of a double-screw extruder (comprising ten areas in total), simultaneously adding carbon fibers from a side feeding port of one area of the double-screw extruder, melting MDI at a constant temperature of 60 ℃, feeding the MDI from a side feeding port of five areas of the double-screw extruder through a melt pump, controlling the length-diameter ratio of the double-screw extruder to be 48:1, controlling the temperature of each section of the double-screw extruder to be 265-300 ℃, controlling the rotating speed to be 350-500 rpm, and extruding and granulating to obtain the carbon fiber reinforced nylon material. Wherein the amounts of the components are shown in table 1.
Example 2
S1, drying nylon (PA66, the relative viscosity of which is 2.5 under the condition that the temperature is 40 +/-0.1 ℃ and the reference medium is 96 +/-0.15 wt% of sulfuric acid water solution) and carbon fibers (chopped carbon fibers with the monofilament diameter of 5-10 mu m, the length of 4-8 mm and the surface coated with 3 wt% of polyurethane) in a blast drying box at 100 ℃ until the moisture content is less than 500ppm for later use. Uniformly mixing nylon 66, polycarbodiimide, an antioxidant and a lubricant in a low-speed mixer to obtain the premix.
S2, adding the premix from a main feeding port of one area of a double-screw extruder (comprising ten areas in total), simultaneously adding carbon fibers from a side feeding port of one area of the double-screw extruder, melting MDI at a constant temperature of 60 ℃, feeding the MDI from a side feeding port of five areas of the double-screw extruder through a melt pump, controlling the length-diameter ratio of the double-screw extruder to be 48:1, controlling the temperature of each section of the double-screw extruder to be 265-300 ℃, controlling the rotating speed to be 350-500 rpm, and extruding and granulating to obtain the carbon fiber reinforced nylon material. Wherein the amounts of the components are shown in table 1.
Example 3
S1, drying nylon (PA66, the relative viscosity of which is 3.0 under the condition that the temperature is 40 +/-0.1 ℃ and the reference medium is 96 +/-0.15 wt% of sulfuric acid water solution) and carbon fibers (chopped carbon fibers with the monofilament diameter of 5-10 mu m, the length of 4-8 mm and the surface coated with 2 wt% of polyurethane) in a blast drying box at 100 ℃ until the moisture content is less than 500ppm for later use. Uniformly mixing nylon 66, polycarbodiimide, an antioxidant and a lubricant in a low-speed mixer to obtain the premix.
S2, adding the premix from a main feeding port of one area of a double-screw extruder (comprising ten areas in total), simultaneously adding carbon fibers from a side feeding port of one area of the double-screw extruder, melting MDI at a constant temperature of 60 ℃, feeding the MDI from a side feeding port of five areas of the double-screw extruder through a melt pump, controlling the length-diameter ratio of the double-screw extruder to be 48:1, controlling the temperature of each section of the double-screw extruder to be 265-300 ℃, controlling the rotating speed to be 350-500 rpm, and extruding and granulating to obtain the carbon fiber reinforced nylon material. Wherein the amounts of the components are shown in table 1.
Comparative example 1
A carbon fiber-reinforced nylon material was prepared in the same manner as in example 1, except that the same parts by weight of POE-g-MAH (graft ratio: 3 wt%) was used in place of the diphenylmethane diisocyanate, and the remaining conditions were the same as in example 1, to obtain a reference carbon fiber-reinforced nylon material. Wherein the amounts of the components are shown in table 1.
Comparative example 2
A carbon fiber-reinforced nylon material was prepared according to the method of example 1, except that polycarbodiimide and diphenylmethane diisocyanate were not added, and the remaining conditions were the same as in example 1, to obtain a reference carbon fiber-reinforced nylon material. Wherein the amounts of the components are shown in table 1.
Comparative example 3
A carbon fiber reinforced nylon material was prepared according to the method of example 1, except that, during the melt extrusion in the twin-screw extruder, diphenylmethane diisocyanate and the premix were simultaneously fed from a main feeding port of one zone of the twin-screw extruder, and carbon fibers were simultaneously fed from a side feeding port of one zone of the twin-screw extruder, under the same conditions as in example 1, to obtain a reference carbon fiber reinforced nylon material. Wherein the amounts of the components are shown in table 1.
TABLE 1
| Name of raw materials | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Nylon | 76.8 | 65.1 | 51.4 | 76.8 | 78.6 | 76.8 |
| Carbon fiber | 20 | 30 | 40 | 20 | 20 | 20 |
| MDI | 5 | 3 | 2 | - | - | 5 |
| POE-g-MAH | - | - | - | 5 | - | - |
| PolycarbonDiimine compounds | 2 | 1 | 0.5 | 2 | - | 2 |
| Antioxidant 1098 | 0.5 | 0.3 | 0.2 | 0.5 | 0.5 | 0.5 |
| Antioxidant 9228 | 0.5 | 0.3 | 0.3 | 0.5 | 0.5 | 0.5 |
| Lubricant AC540A | 0.6 | 0.3 | 0.2 | 0.6 | 0.6 | 0.6 |
Test example
Tensile strength, flexural strength, heat distortion temperature and fatigue resistance of the carbon fiber reinforced nylon materials obtained in examples 1 to 3 and the reference carbon fiber reinforced nylon materials obtained in comparative examples 1 to 3 were measured by the following methods, respectively, and the results are shown in table 2.
(1) Tensile strength: testing according to ISO 572-2;
(2) bending strength: testing according to ISO 178;
(3) heat distortion temperature: testing according to ISO075-2 (method A);
(4) fatigue resistance (tensile and compressive fatigue-failure cycle): standard type I bars were prepared according to ISO178, after which fatigue resistance tests were carried out under conditions of 150MPa, 80Hz until the bars broke.
TABLE 2
| Test items | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Tensile Strength (MPa) | 223 | 275 | 297 | 194 | 218 | 197 |
| Flexural Strength (MPa) | 298 | 363 | 392 | 278 | 277 | 274 |
| Heat distortion temperature (. degree. C.) | 252 | 251 | 253 | 237 | 250 | 250 |
| Tension-compression fatigue-failure cycle (time) | 4.3E+6 | 1.4E+7 | 5.76E+6 | 7.6E+5 | 4.2E+6 | 3.3E+6 |
From the results in table 2, it can be seen that the carbon fiber reinforced nylon material prepared by the raw material and the method provided by the invention has excellent fatigue strength, mechanical strength and heat resistance.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (9)
1. The raw materials for preparing the carbon fiber reinforced nylon material are characterized by consisting of nylon, carbon fibers, an isocyanate compound with a functional group of 2, polycarbodiimide, an antioxidant and a lubricant, wherein the carbon fibers are carbon fibers with surfaces coated with polyurethane, the weight ratio of the nylon to the carbon fibers to the isocyanate compound with the functional group of 2 to the polycarbodiimide is (25-160): (10-80): 1-10): 1, and the isocyanate compound with the functional group of 2 is independently stored; the nylon is selected from at least one of nylon 66, nylon 6, nylon 612 and nylon 12; the isocyanate compound with the functional group of 2 is diphenylmethane diisocyanate and/or toluene diisocyanate;
the carbon fiber reinforced nylon material is prepared by the following method:
s1, placing the nylon, the polycarbodiimide, the antioxidant and the lubricant into a low-speed mixer to be uniformly mixed to obtain a premix;
and S2, adding the premix and the carbon fibers from a main feeding port and a first side feeding port of a double-screw extruder respectively for melt blending to obtain a nylon carbon fiber blend, adding an isocyanate compound with a functional group of 2 from a second side feeding port of the double-screw extruder after melting to continue melt blending with the nylon carbon fiber blend, and then extruding the obtained melt blending product to obtain the carbon fiber reinforced nylon material.
2. The raw material for preparing the carbon fiber reinforced nylon material according to claim 1, wherein the raw material for preparing the carbon fiber reinforced nylon material comprises 50 to 80 parts by weight of nylon, 20 to 40 parts by weight of carbon fiber, 2 to 5 parts by weight of an isocyanate compound having a functional group of 2, 0.5 to 2 parts by weight of polycarbodiimide, 0.5 to 1 part by weight of an antioxidant, and 0.2 to 0.6 part by weight of a lubricant.
3. The raw material for preparing the carbon fiber reinforced nylon material according to claim 1 or 2, wherein the nylon has a relative viscosity of 2.5 to 3.0 at a temperature of 40 ℃ ± 0.1 ℃ and a reference medium of 96 ± 0.15 wt% aqueous solution of sulfuric acid; the moisture content of the nylon is less than 500 ppm.
4. The raw material for preparing the carbon fiber reinforced nylon material as claimed in claim 1 or 2, wherein the carbon fibers are chopped carbon fibers with a monofilament diameter of 5-10 μm and a length of 4-8 mm; the amount of the polyurethane coated on the surface of the carbon fiber is 1.5-3 wt%; the moisture content of the carbon fiber is less than 500 ppm.
5. The starting material for producing a carbon fiber-reinforced nylon material according to claim 1 or 2, wherein the antioxidant is a mixture of N, N' -bis- (3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine and bis (2, 4-dicumylphenyl) pentaerythritol diphosphite; the lubricant is a silicone lubricant and/or an ethylene acrylic acid copolymer.
6. A method for preparing a carbon fiber reinforced nylon material, which is characterized in that the carbon fiber reinforced nylon material takes the preparation raw material of the carbon fiber reinforced nylon material as claimed in any one of claims 1 to 5 as a raw material and the preparation method comprises the following steps:
s1, placing the nylon, the polycarbodiimide, the antioxidant and the lubricant into a low-speed mixer to be uniformly mixed to obtain a premix;
and S2, adding the premix and the carbon fibers from a main feeding port and a first side feeding port of a double-screw extruder respectively for melt blending to obtain a nylon carbon fiber blend, adding an isocyanate compound with a functional group of 2 from a second side feeding port of the double-screw extruder after melting to continue melt blending with the nylon carbon fiber blend, and then extruding the obtained melt blending product to obtain the carbon fiber reinforced nylon material.
7. The preparation method of the carbon fiber reinforced nylon material as claimed in claim 6, wherein the length-diameter ratio of the twin-screw extruder is (36-48): 1, the extrusion temperature is 265-300 ℃, and the screw rotation speed is 350-500 r/min.
8. A carbon fiber reinforced nylon material produced by the method of claim 6 or 7.
9. Use of the carbon fiber reinforced nylon material of claim 8 as a material for the manufacture of mechanical gears, transmission links or structural supports.
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| CN201910412566.8A CN110041700B (en) | 2019-05-17 | 2019-05-17 | Carbon fiber reinforced nylon material, preparation raw material, preparation method and application thereof |
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| CN201910412566.8A CN110041700B (en) | 2019-05-17 | 2019-05-17 | Carbon fiber reinforced nylon material, preparation raw material, preparation method and application thereof |
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| CN113897790A (en) * | 2021-09-24 | 2022-01-07 | 信泰(福建)科技有限公司 | Carbon fiber TPU coated manufacturing method and modified TPU carbon fiber yarn thereof |
| CN114410104B (en) * | 2022-01-13 | 2024-04-16 | 南京聚隆科技股份有限公司 | Wear-resistant antistatic PA6-GF30 composite material and preparation method thereof |
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