CN113563664A - Halogen-free flame-retardant polyethylene sheath material for high-voltage cable and preparation method thereof - Google Patents
Halogen-free flame-retardant polyethylene sheath material for high-voltage cable and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K2003/026—Phosphorus
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K2003/2224—Magnesium hydroxide
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Abstract
The invention provides a halogen-free flame-retardant polyethylene sheath material for a high-voltage cable and a manufacturing method thereof, and the halogen-free flame-retardant polyethylene sheath material for the high-voltage cable comprises the following components: 20 to 30 parts of linear low-density polyethylene resin, 8 to 20 parts of ethylene-octene copolymer, 8 to 20 parts of compatilizer, 30 to 45 parts of inorganic flame retardant, 8 to 16 parts of flame-retardant synergist, 1 to 3 parts of lubricant, 0.3 to 1 part of antioxidant, 0.2 to 2 parts of coupling agent and 1 to 8 parts of color master batch. The invention overcomes the defects of low elongation and low cracking resistance of the existing sheath material by changing the composition of the halogen-free flame-retardant polyethylene sheath material for the high-voltage cable.
Description
Technical Field
The invention relates to the field of flame-retardant high polymer materials, in particular to a halogen-free flame-retardant polyethylene sheath material for a high-voltage cable and a manufacturing method thereof.
Background
The nonmetal outer protective layer of the high-voltage cable mainly has the functions of insulating ground, preventing water, protecting machinery and the like and serves as a first protective layer of the high-voltage cable. Some projects put severe requirements on flame retardance of cables due to the particularity of laying environments, and common outer protective layer materials of high-voltage cables comprise two main types of materials, namely polyvinyl chloride and polyethylene. However, polyvinyl chloride is a typical halogen-containing material, generates a large amount of toxic gas in the combustion process, and is not suitable for areas with many people, such as public places. The common polyethylene material has poor flame retardant performance, but the mechanical performance of the polyethylene material added with the halogen-free flame retardant is poor. When the halogen-free flame-retardant polyethylene is used as a high-voltage cable material, the problems of difficult extrusion, large extrusion current, large amount of air holes in the cable section and the like can occur in the extrusion of the halogen-free flame-retardant polyethylene for the common high-voltage cable because the outer diameter of the high-voltage cable is larger.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a halogen-free flame-retardant polyethylene sheath material for a high-voltage cable and a manufacturing method thereof, aiming at solving the defects of low elongation and low cracking resistance of the halogen-free flame-retardant polyethylene sheath material for the high-voltage cable in the prior art.
According to one aspect of the embodiments of the present invention, the present invention provides a halogen-free flame retardant polyethylene sheath material for high voltage cables, comprising: 20 to 30 parts of linear low-density polyethylene resin, 8 to 20 parts of ethylene-octene copolymer, 8 to 20 parts of compatilizer, 30 to 45 parts of inorganic flame retardant, 8 to 16 parts of flame-retardant synergist, 1 to 3 parts of lubricant, 0.3 to 1 part of antioxidant, 0.2 to 2 parts of coupling agent and 1 to 8 parts of color master batch
Alternatively, the linear low density polyethylene resin comprises one or both of a general melt index linear low density polyethylene resin having a melt flow rate of not more than 3.5g/10min and a high melt index linear low density polyethylene resin having a melt flow rate of not more than 20.0g/10 min.
Optionally, the compatibilizer comprises one or more of maleic anhydride grafted polyethylene, maleic anhydride grafted ethylene-vinyl acetate copolymer, and maleic anhydride grafted ethylene octene copolymer.
Optionally, the inorganic flame retardant comprises one or both of aluminum hydroxide and magnesium hydroxide.
Optionally, the flame retardant synergist comprises one or more of red phosphorus, aluminum diethylphosphinate, ammonium polyphosphate, zinc borate and a composite char forming agent.
Optionally, the lubricant comprises one or more of polyethylene wax, silicone, erucamide, calcium stearate, and ethylene bis stearamide.
Optionally, the antioxidant comprises one or more of antioxidant 1010, antioxidant 1076, antioxidant 300, antioxidant 168 and antioxidant DLTP.
Optionally, the coupling agent is a silane coupling agent.
According to another aspect of the embodiments of the present invention, the present invention provides a method for manufacturing a halogen-free flame retardant polyethylene sheath material for a high voltage cable, which is used for the halogen-free flame retardant polyethylene sheath material for a high voltage cable, and includes:
mixing linear low-density polyethylene resin, ethylene-octene copolymer, compatilizer, inorganic flame retardant, flame-retardant synergist, lubricant, antioxidant and black color master batch according to respective parts by weight, and then putting the mixture into a mixer for uniform mixing to obtain a mixture;
placing the mixture into an internal mixer for internal mixing, and adding a coupling agent into the mixture to obtain a molten mixture;
and putting the molten mixture into a production unit for extrusion granulation.
Alternatively, the mixing time of the mixer is 60 seconds to 300 seconds, the effective volume of the internal mixer is 75L, the internal mixing temperature of the internal mixer is 120 degrees to 160 degrees, and the production unit comprises a double-screw extruder and a single-screw extruder.
The invention discloses a halogen-free flame-retardant polyethylene sheath material for a high-voltage cable and a manufacturing method thereof, and the halogen-free flame-retardant polyethylene sheath material for the high-voltage cable is improved in components, so that the problems of low elongation and low cracking resistance of the halogen-free flame-retardant polyethylene sheath material for the high-voltage cable in the prior art can be effectively solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a process flow chart of a halogen-free flame retardant polyethylene sheath material for a high voltage cable according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a halogen-free flame-retardant polyethylene sheath material for a high-voltage cable, which comprises the following components: 20 to 30 parts of linear low-density polyethylene resin, 8 to 20 parts of ethylene-octene copolymer, 8 to 20 parts of compatilizer, 30 to 45 parts of inorganic flame retardant, 8 to 16 parts of flame-retardant synergist, 1 to 3 parts of lubricant, 0.3 to 1 part of antioxidant, 0.2 to 2 parts of coupling agent and 1 to 8 parts of color master batch.
In some embodiments, a proportion of the high melt index linear low density polyethylene resin promotes the processing flow extrusion performance of the whole formulation system, and the processing rheological performance of the finished product is very superior by matching with a proper lubricating system. The linear low density polyethylene resin has a melt flow rate of not more than 20g/min, the linear low density polyethylene resin comprises one or both of a general melt index linear low density polyethylene resin and a high melt index linear low density polyethylene resin, the general melt index linear low density polyethylene resin has a melt flow rate of not more than 3.5g/10min, and the high melt index linear low density polyethylene resin has a melt flow rate of not more than 20.0g/10 min. Alternatively, in order to adapt to extrusion of large-diameter high-voltage cables, the flame-retardant polyethylene sheath material needs very superior processing and extrusion properties.
In some embodiments, the ethylene-octene copolymer melt flow rate is not greater than 5g/10 min. Preferably, the melt flow rate of the ethylene-octene copolymer melt is not greater than 1.0g/10 min.
In some embodiments, the compatibilizer is used for compounding with resin, the compatibilizer is maleic anhydride grafted modified polyolefin, the melt flow rate of the compatibilizer is not more than 3.0g/10min, and the content of the functional group is 0.5-1.0 wt%. Preferably, the melt flow rate of the compatilizer is not more than 2.5g/10min, and the content of the functional group is 0.5-0.8 wt%. The compatilizer comprises one or more of maleic anhydride grafted polyethylene, maleic anhydride grafted ethylene-vinyl acetate copolymer and maleic anhydride grafted ethylene octene copolymer.
In some embodiments, the inorganic flame retardant comprises one or both of aluminum hydroxide, magnesium hydroxide.
In some embodiments, the flame retardant synergist comprises one or more of red phosphorus, aluminum diethylphosphinate, ammonium polyphosphate, zinc borate, and composite char-forming agents. The water generated in the initial combustion stage reacts with red phosphorus to generate phosphoric acid, and the phosphoric acid promotes the dehydration and carbonization of the composite charring agent to form a compact carbon layer. Magnesium hydroxide in part of the antioxidant reacts with phosphoric acid to generate magnesium phosphate which is attached to the carbon layer, so that the carbon layer is harder; the other part of the magnesium hydroxide is heated and decomposed to generate steam and magnesium oxide, and the magnesium oxide forms a compact metal oxide protective film to isolate the external air and heat. At high temperature, zinc borate is decomposed to generate boron trioxide solid which is attached to the surface of the material to promote the formation of a carbon layer, and a covering layer is generated at the same time, so that the generation of combustible gas can be effectively inhibited, the further proceeding of oxidation and thermal decomposition is prevented, and the covering layer is harder than a common carbon layer. When the temperature is higher than 300 ℃, the zinc borate is thermally decomposed to lose crystal water, and the effects of absorbing heat, cooling and diluting oxygen are achieved; meanwhile, part of zinc in the zinc borate enters a gas-phase combustion phase in the form of zinc oxide, and free radicals in the combustion reaction are captured, so that the polyolefin material is promoted to be dehydrated and carbonized, and the generation of combustible gas and the speed of the combustion reaction are reduced.
In embodiments of the present invention, there is also a need to improve the lubricant, including one or more of polyethylene wax, silicone, erucamide, calcium stearate, and ethylene bis stearamide, to further increase the flexibility of the jacket material.
In some embodiments, the antioxidant comprises one or more of antioxidant 1010, antioxidant 1076, antioxidant 300, antioxidant 168, and antioxidant DLTP.
In some embodiments, the coupling agent is a silane coupling agent, preferably 0.2-1.6 parts by weight of the coupling agent, and preferably 4-6 parts by weight of the black color masterbatch.
The halogen-free flame-retardant polyethylene sheath material for the high-voltage cable has good flexibility through the synergistic effect of the components, the tensile strength of the sheath material is more than 13MPa, the elongation at break of the sheath material is more than 420%, and the sheath material can bear the load of more than 5 kilograms for 1 hour at the temperature of more than 130 ℃ without cracking.
As shown in fig. 1, the invention also provides a method for manufacturing the halogen-free flame retardant polyethylene sheath material for the high voltage cable, which is used for manufacturing the halogen-free flame retardant polyethylene sheath material for the high voltage cable, and comprises the following steps:
step S1: mixing linear low-density polyethylene resin, ethylene-octene copolymer, compatilizer, inorganic flame retardant, flame-retardant synergist, lubricant, antioxidant and black color master batch according to respective parts by weight, and then putting the mixture into a mixer for uniform mixing to obtain a mixture;
step S2: placing the mixture into an internal mixer for internal mixing, and adding a coupling agent into the mixture to obtain a molten mixture;
step S3: and putting the molten mixture into a production unit for extrusion granulation.
In step S1, the linear low-density polyethylene resin, the ethylene-octene copolymer, and the compatibilizer are mixed and fed into a mixing device, and are mixed in a reciprocating manner up and down to obtain a mixed resin. And putting the mixed resin into a storage bin, and putting the mixed resin into a high-speed mixer through an automatic metering system. And then putting the inorganic flame retardant, the flame-retardant synergist, the lubricant, the antioxidant and the black color master batch into a mixer, and starting high-speed mixing, wherein the mixing time of the mixer is 60 seconds to 300 seconds.
In step S2, the effective volume of the internal mixer is 75L, and the internal mixing temperature of the internal mixer is between 120 ℃ and 160 ℃.
In step S3, the production line includes a twin-screw extruder and a single-screw extruder. The processing technology of the double-screw extruder for extrusion granulation comprises the following steps: first zone 90-105 ℃, second zone 105-125 ℃, third zone 120-135 ℃, fourth zone 120-140 ℃, fifth zone 120-140 ℃, sixth zone 120-140 ℃, seventh zone 120-140 ℃, eighth zone 110-135 ℃, ninth zone 110-130 ℃, tenth zone 100-120 ℃; the processing technology of the single-screw extruder for extruding and granulating comprises the following steps: the first zone is 100-120 ℃, the second zone is 110-130 ℃, the third zone is 115-135 ℃, the screen changing zone is 120-145 ℃ and the machine head is 120-155 ℃.
Example (b):
example 1, example 2, example 3 and example 4 were prepared according to the parts by weight of the components in table 1:
table 1 dosage of the formulations
In Table 1, the linear low density polyethylene resin has a melt flow rate of not more than 20g/min, the compatibilizer has a melt flow rate of not more than 2.5g/10min, the functional group content is 0.5 to 0.8 wt%, the antioxidant is 0.4 to 0.8 parts by weight, and the black masterbatch is 4 to 6 parts by weight.
Table 2 performance requirements of the halogen-free flame retardant polyethylene sheath material for high voltage cables prepared according to example 1, example 2, example 3 and example 4.
TABLE 2 halogen-free flame-retardant polyethylene sheath material for high-voltage cable
Table 2 (continuation)
As can be seen from table 2, the halogen-free flame retardant polyethylene sheath material for high voltage cables of the present invention has good flexibility through the synergistic effect of the components, in examples 1 to 4, the improved halogen-free flame retardant polyethylene sheath material for high voltage cables has a tensile strength of 13MPa or more, an oxygen index of 28 to 30, an elongation at break of 420% or more, does not crack when processed for 1 hour at 130 degrees or more and bearing 5 kilograms, and can maintain good tensile strength and elongation at break even in an air heating oven at 110 degrees or more.
As can be seen from Table 2, the halogen-free flame-retardant polyethylene sheath material for the high-voltage cable, which is disclosed by the invention, has good tensile strength and crack resistance, and can overcome the defects of low tensile strength and low crack resistance of the conventional halogen-free flame-retardant polyethylene sheath material.
Table 3 shows the application effect of the halogen-free flame retardant polyethylene sheath material for high voltage cable provided by the present invention in the high voltage cable sheath according to the embodiment 1, the embodiment 2, the embodiment 3 and the embodiment 4.
TABLE 3 application effect of halogen-free flame-retardant polyethylene sheath material for high-voltage cable
| Evaluation item | Example 1 | Example 2 | Example 3 | Example 4 |
| Extrusion speed (m/min) | 4.2 | 4.0 | 3.8 | 4.0 |
| Extrusion current (A) | 320 | 310 | 340 | 340 |
| Sheath thickness (mm) | 10 | 8 | 8 | 8 |
| Cable external diameter (mm) | 120 | 100 | 100 | 100 |
| ExtrusionSurface of | Leveling | Leveling | Leveling | Leveling |
| Internal condition of sheath | Densification of | Densification of | Densification of | Densification of |
| Bundled flame test | Class C | Class C | Class C | Class C |
As can be seen from Table 3, when the sheath is extruded, the diameter of the sheath can reach more than 100 mm, the internal structure of the prepared sheath is compact, the extrusion current is small, and the flame retardant effect is good in the flame retardant experiment. Therefore, the invention can solve the problem that the halogen-free flame-retardant polyethylene sheath material in the prior art is difficult to be applied to large-diameter sheaths such as high-voltage cables.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The halogen-free flame-retardant polyethylene sheath material for the high-voltage cable is characterized by comprising the following components in percentage by weight: 20 to 30 parts of linear low-density polyethylene resin, 8 to 20 parts of ethylene-octene copolymer, 8 to 20 parts of compatilizer, 30 to 45 parts of inorganic flame retardant, 8 to 16 parts of flame-retardant synergist, 1 to 3 parts of lubricant, 0.3 to 1 part of antioxidant, 0.2 to 2 parts of coupling agent and 1 to 8 parts of color master batch.
2. The sheath material of halogen-free flame retardant polyethylene for high voltage cable according to claim 1, wherein the linear low density polyethylene resin comprises one or both of a general melt index linear low density polyethylene resin and a high melt index linear low density polyethylene resin, the melt flow rate of the general melt index linear low density polyethylene resin is not more than 3.5g/10min, and the melt flow rate of the high melt index linear low density polyethylene resin is not more than 20.0g/10 min.
3. The halogen-free flame retardant polyethylene sheath material for high voltage cable according to claim 1, wherein the compatibilizer comprises one or more of maleic anhydride grafted polyethylene, maleic anhydride grafted ethylene-vinyl acetate copolymer and maleic anhydride grafted ethylene octene copolymer.
4. The halogen-free flame retardant polyethylene sheath material for high voltage cable according to claim 1, wherein the inorganic flame retardant comprises one or both of aluminum hydroxide and magnesium hydroxide.
5. The halogen-free flame retardant polyethylene sheath material for the high voltage cable according to claim 1, wherein the flame retardant synergist comprises one or more of red phosphorus, aluminum diethylphosphinate, ammonium polyphosphate, zinc borate and a composite char former.
6. The halogen-free flame retardant polyethylene sheath material for high voltage cable according to claim 1, wherein the lubricant comprises one or more of polyethylene wax, silicone, erucamide, calcium stearate and ethylene bis-stearamide.
7. The halogen-free flame retardant polyethylene sheath material for the high voltage cable according to claim 1, wherein the antioxidant comprises one or more of antioxidant 1010, antioxidant 1076, antioxidant 300, antioxidant 168 and antioxidant DLTP.
8. The halogen-free flame retardant polyethylene sheath material for high voltage cable according to claim 1, wherein the coupling agent is a silane coupling agent.
9. A method for manufacturing a halogen-free flame retardant polyethylene sheath material for high voltage cables, which is used for the halogen-free flame retardant polyethylene sheath material for high voltage cables as claimed in any one of claims 1 to 8, and which comprises the following steps:
mixing linear low-density polyethylene resin, ethylene-octene copolymer, compatilizer, inorganic flame retardant, flame-retardant synergist, lubricant, antioxidant and black color master batch according to respective parts by weight, and then putting the mixture into a mixer for uniform mixing to obtain a mixture;
placing the mixture into an internal mixer for internal mixing, and adding a coupling agent into the mixture to obtain a molten mixture;
and putting the molten mixture into a production unit for extrusion granulation.
10. The method of claim 9, wherein the mixing time of the mixer is 60 seconds to 300 seconds, the effective volume of the internal mixer is 75L, the internal mixing temperature of the internal mixer is 120 degrees to 160 degrees, and the production line includes a twin screw extruder and a single screw extruder.
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