A double-layer composite pipe and a method for manufacturing the same

Abstract

The application discloses a double-layer composite pipe and a preparation method thereof, which comprises an inner layer material and an outer layer material, wherein the outer layer material is prepared from copolymerized polyamide 47-87%, toughening agent 5-20%, glass fiber 5-30%, antioxidant A 0.1-3% and color masterbatch 0-3% according to mass percentage; and the inner layer material is prepared from maleic anhydride grafted SEBS 10-60%, high-viscosity homopolymerized polypropylene 8-40%, SEBS 0-34.9%, high-viscosity white oil 15-35%, antioxidant B 0.1-3% and color masterbatch 0-3%. The outer layer polyamide resin uses decamethylenediamine, pentanediamine and sebacic acid as monomer raw materials, and the raw materials are all derived from bio-based materials. When the outer layer copolymerized polyamide is modified, the material strength and heat distortion temperature are improved through the addition of glass fiber reinforcement, and the normal temperature and high-temperature burst performance of the overall pipeline is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high polymer material synthesis and processing, and particularly relates to a double-layer composite pipe and a preparation method thereof. BACKGROUND

[0002] With the rapid development of the new energy automobile industry, the requirements for the automobile thermal management system are increasingly improved; the cooling pipeline is an important component of the thermal management system; the PA12 / adhesive layer / PP three-layer pipe structure widely used at present has a general pipe line burst pressure of about 4 MPa due to the low hardness of the PA12 material, and is not suitable for the cooling liquid delivery of high speed and high pressure. In order to increase the cooling liquid delivery capacity, the pipe diameter can only be increased, which seriously increases the pipe volume and is not conducive to the compact arrangement of the cooling system. SUMMARY

[0003] Therefore, the present application provides a double-layer composite pipe and a preparation method thereof to solve the problems in the background technology. The pipe outer layer material is prepared by using full-bio-based raw materials, i.e., sebacic acid, decanediamine and pentanediamine, and polyamide, and the outer layer of the pipe has high strength, which greatly improves the burst strength at room temperature and high temperature. The inner layer uses SEBS-g-MAH modified soft glue material, which is easy to install and connect, and improves the fatigue vibration resistance. The double-layer composite pipe produced by the present application can be applied to the cooling pipeline system of new energy automobiles, energy storage batteries and the like.

[0004] To achieve the above object, the present application provides the following technical scheme:

[0005] In one aspect, the present application discloses a double-layer composite pipe, which comprises an inner layer material and an outer layer material, wherein, according to the mass percentage:

[0006] The outer layer material is prepared from copolymerized polyamide 47-87%, toughening agent 5-20%, glass fiber 5-30%, antioxidant A 0.1-3% and color masterbatch 0-3%.

[0007] The inner layer material is prepared from maleic anhydride grafted SEBS 10-60%, high viscosity homopolymerized polypropylene 8-40%, SEBS 0-34.9%, high viscosity white oil 15-35%, antioxidant B 0.1-3% and color masterbatch 0-3%.

[0008] As a further scheme of the present application, in the outer layer material, the toughening agent is at least one of maleic anhydride grafted POE, maleic anhydride grafted SEBS and maleic anhydride grafted EPDM.

[0009] As a further scheme of the present application, in the outer layer material, the glass fiber is a short-cut glass fiber.

[0010] As a further scheme of the present application: in the outer layer material, the copolyamide is a medium-high viscosity copolyamide copolymer, and the relative viscosity is 2.0-3.3; the preparation method of the copolyamide is as follows:

[0011] The decanediamine and sebacic acid are added into deionized water, heated and stirred to prepare a 30-70% concentration salt solution F1; the pentanediamine and sebacic acid are added into deionized water, heated and stirred to prepare a 30-70% concentration salt solution F2; the salt solution F1 and the salt solution F2 are added into a polymerization kettle according to the mass ratio of the two salts (4-30):1 to obtain a mixed salt solution;

[0012] The mixed salt solution is heated to 230-260℃, and first kept warm for 2-5 hours under normal pressure nitrogen blowing, and then vacuumized for 1-2 hours under a pressure lower than 400Pa to obtain a polymerization product, the viscosity is controlled by controlling the stirring current, and the copolyamide is prepared by drawing, cutting and drying.

[0013] As a further scheme of the present application: in the outer layer material, the antioxidant A is compounded by Irganox 1098, Irganox 245 and Irganox 168.

[0014] As a further scheme of the present application: in the inner layer material, the antioxidant B is compounded by Irganox 1010 and Irganox 168.

[0015] As a further scheme of the present application: in the inner layer material, the high viscosity homopolypropylene has a melt index of 0.1-6g / 10min at 230℃ and under a load of 2.16kg.

[0016] As a further scheme of the present application: the high viscosity white oil is naphthenic oil, and the kinematic viscosity at 40℃ is 100-300mm2 / s.

[0017] Another aspect of the present application discloses a preparation method of the double-layer composite pipe, comprising the following steps:

[0018] S1, the copolyamide, the toughening agent, the antioxidant A and the color masterbatch are blended to obtain a mixture one, the mixture one is put into a main feeding port of a double-screw extruder, the glass fiber is put into a sub-feeding port of the double-screw extruder, and the outer layer material is obtained by extruding, drawing, cutting and drying;

[0019] S2, the maleic anhydride grafted SEBS, the high viscosity homopolypropylene, the SEBS, the high viscosity white oil, the antioxidant B and the color masterbatch are blended to obtain a mixture two, the mixture two is put into a double-screw extruder after standing for at least 1 hour to allow the white oil to be fully absorbed, and the inner layer material is obtained by drawing, cutting and drying.

[0020] S3, the outer layer material and the inner layer material are added into a two-layer pipe extruder for melt extrusion, to obtain a double-layer composite pipe.

[0021] Further:

[0022] In step S1, the temperature of each zone of the double-screw extruder is as follows: the temperature of the first zone is 130-240 DEG C, the temperature of the second zone is 180-280 DEG C, the temperature of the third zone is 180-280 DEG C, the temperature of the fourth zone is 180-280 DEG C, the temperature of the fifth zone is 180-280 DEG C, the temperature of the sixth zone is 180-280 DEG C, the temperature of the seventh zone is 180-280 DEG C, the temperature of the eighth zone is 180-280 DEG C, the temperature of the ninth zone is 180-280 DEG C, and the temperature of the tenth zone is 180-280 DEG C; the temperature of the die head is 200-290 DEG C; and the rotation speed of the main machine is 100-1200 r / min.

[0023] In step S2, the temperature of each zone of the double-screw extruder is as follows: the temperature of the first zone is 140-200 DEG C, the temperature of the second zone is 160-270 DEG C, the temperature of the third zone is 160-270 DEG C, the temperature of the fourth zone is 160-270 DEG C, the temperature of the fifth zone is 160-270 DEG C, the temperature of the sixth zone is 160-270 DEG C, the temperature of the seventh zone is 160-270 DEG C, the temperature of the eighth zone is 160-270 DEG C, the temperature of the ninth zone is 160-270 DEG C, and the temperature of the tenth zone is 160-270 DEG C; the temperature of the die head is 200-280 DEG C; and the rotation speed of the main machine is 100-1200 r / min.

[0024] In step S3, a double-layer pipe extruder is used. The temperature settings of the outer layer material are as follows: the temperature of the first zone is 160-190 DEG C, the temperature of the second zone is 180-270 DEG C, the temperature of the third zone is 200-270 DEG C, the temperature of the fourth zone is 200-270 DEG C, and the temperature of the fifth zone is 200-270 DEG C; the temperature settings of the inner layer material are as follows: the temperature of the first zone is 120-150 DEG C, the temperature of the second zone is 170-260 DEG C, the temperature of the third zone is 170-260 DEG C, the temperature of the fourth zone is 170-260 DEG C, and the temperature of the fifth zone is 170-260 DEG C; and the temperature settings of the die head are as follows: the temperature of the first zone is 200-280 DEG C, the temperature of the second zone is 200-280 DEG C, the temperature of the third zone is 200-280 DEG C, the temperature of the fourth zone is 200-280 DEG C, and the temperature of the fifth zone is 210-280 DEG C.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] 1. The outer layer polyamide resin uses decamethylenediamine, pentanediamine and sebacic acid as monomer raw materials, and the raw materials are all derived from biological materials.

[0027] 2. When the outer layer copolymerized polyamide is modified, the material strength and heat distortion temperature are improved by adding glass fiber reinforcement, and the normal temperature and high temperature burst performance of the overall pipeline is greatly improved.

[0028] 3. The outer polyamide resin is copolymerized, which reduces the polyamide crystallization rate during pipe extrusion molding and improves the interfacial bonding force between polyamide and glass fiber, thereby significantly improving the smoothness of the outer layer of the pipe and reducing the surface fiber floating of the outer layer of the pipe.

[0029] 4. The outer polyamide layer, through the addition of SEBS-g-MAH, POE-g-MAH, and EPDM-g-MAH toughening agents, significantly improves the low-temperature impact performance of the pipe.

[0030] 5. By adding SEBS-g-MAH, high-viscosity white oil, antioxidants, and color masterbatch, PP material produces a high-toughness inner layer material with strong adhesion to the outer layer of reinforcing polyamide. At the same time, due to its high flexibility, it is easy to install quick-connect fittings, and the fluid being transported will not leak from the connection point. Detailed Implementation

[0031] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0033] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0034] Short-cut fiberglass GF1, manufactured by China Jushi Co., Ltd.: 568H;

[0035] Short-cut glass fiber GF2, manufactured by Chongqing International Composite Materials Co., Ltd.: ECS301HP-3-H;

[0036] POE-g-MAH, manufacturer: DuPont Fusabond: N216;

[0037] SEBS-g-MAH, manufactured by Kraton polymer: FG1901;

[0038] EPDM-g-MAH, manufactured by ExxonMobil: EXXELOR VA1803;

[0039] Antioxidant 245, Antioxidant 1098, Antioxidant 168, etc. are all manufactured by BASF.

[0040] PA1010, manufacturer is Shandong Dongchen Ruishisen New Material Science and Technology Co., Ltd., relative viscosity 2.7;

[0041] Homopolymer PP, manufacturer is Shanghai Petrochemical: S1003;

[0042] High viscosity white oil, Karamay naphthenic oil, KN4010 (40℃ kinematic viscosity 140.7mm 2 / S);

[0043] SEBS, manufacturer is Yueyang Petrochemical: YH503.

[0044] The copolymer polyamide is prepared according to the following method:

[0045] Decamethonium and sebacic acid are added to deionized water, heated and stirred to form a 30-70% concentration salt solution F1; pentamethonium and sebacic acid are added to deionized water, heated and stirred to form a 30-70% concentration salt solution F2; the salt solution F1 and the salt solution F2 are added to the polymerization kettle according to the mass ratio (excluding water) of the two salts in the solution 4:1-30:1 to obtain a mixed salt solution;

[0046] The mixed salt solution is heated to 230-260℃, first kept at constant pressure nitrogen blowing reaction for 2-5 hours, then vacuum reaction for 1-2 hours under a pressure of less than 400Pa to obtain a polymerization product, the viscosity is controlled by controlling the stirring current, and the copolymer polyamide is obtained by drawing, cutting and drying.

[0047] The copolymer polyamide G1 with a relative viscosity of 2.7 is obtained by using the weight ratio of sebacic acid decamethonium salt to sebacic acid pentamethonium salt 30:1; the copolymer resin G2 with a relative viscosity of 3.3 is obtained by using the weight ratio of sebacic acid decamethonium salt to sebacic acid pentamethonium salt 10:1; the copolymer polyamide G3 with a relative viscosity of 2.0 is obtained by using the weight ratio of sebacic acid decamethonium salt to sebacic acid pentamethonium salt 4:1.

[0048] It can be understood that the above raw materials and reagents are only examples of some specific embodiments of the present application, so that the technical scheme of the present application is more clear, and do not represent that the present application can only use the above reagents, and the specific range is subject to the scope of the claims. In addition, the "parts" in the examples and comparative examples, unless otherwise specified, refer to weight parts.

[0049] Any range described in the present application includes the end values and any numerical value between the end values and any sub-range formed by any numerical value of the end values or between the end values.

[0050] Examples A1-A3 and comparative examples a1-a3 are prepared as the outer layer material, and the preparation method is as follows:

[0051] According to the proportioning of Table 1, each component is weighed, the copolyamide, toughening agent, antioxidant, color masterbatch are added into a high-speed mixer, and mixed for 1-10 minutes to obtain material one; extrusion granulation is performed, a double screw extruder with 10 sections is used, and the temperature of each section is set as follows: the temperature of the first section is 130-240℃, the temperature of the second section is 180-280℃, the temperature of the third section is 180-280℃, the temperature of the fourth section is 180-280℃, the temperature of the fifth section is 180-280℃, the temperature of the sixth section is 180-280℃, the temperature of the seventh section is 180-280℃, the temperature of the eighth section is 180-280℃, the temperature of the ninth section is 180-280℃, and the temperature of the tenth section is 180-280℃; the temperature of the die head is 200-290℃; the rotation speed of the main machine of the extruder is 100-1200r / min; the mixed material one is added into the main hopper of the extruder, and the glass fiber is added into the fifth section of the double screw extruder through the side feeding of the loss weight scale; the material is drawn, cut and dried to obtain the outer layer material particles.

[0052] After the outer layer material particles are dried and injection molded into a sample bar, the related performance test data are shown in the test data part of Table 1.

[0053] Table 1

[0054]

[0055] (1) The comparative example a1 is compared with the example A1, and the surface of the pipe material is obviously floating when the homopolymer PA1010 glass fiber reinforced material is directly used as the outer layer material.

[0056] (2) The comparative example a2 is compared with the example A1, and the tensile strength of the material decreases from 92.1MPa of A1 to 42.5MPa without adding the reinforcing glass fiber.

[0057] (3) The comparative example a3 is compared with the example A1, and the low temperature impact performance decreases from 15.8KJ / m 2 to 7.1KJ / m 2 without adding the toughening agent SEBS-g-MAH.

[0058] The examples B1-B3 and the comparative examples b1-b2 are inner layer materials, and the preparation method is as follows:

[0059] According to the proportioning of Table 2, each component was weighed, SEBS-g-MAH (ground into powder, easy to absorb white oil), homopolymer PP, SEBS (powder), antioxidant, white oil, color masterbatch were mixed uniformly in a high-speed mixer, and then were placed for 2 hours. Then, the mixture was added into a 10-section twin-screw extruder for modification and granulation. The temperature of each section of the twin-screw extruder was set as follows: the temperature of the first section was 140-200°C, the temperature of the second section was 160-270°C, the temperature of the third section was 160-270°C, the temperature of the fourth section was 160-270°C, the temperature of the fifth section was 160-270°C, the temperature of the sixth section was 160-270°C, the temperature of the seventh section was 160-270°C, the temperature of the eighth section was 160-270°C, the temperature of the ninth section was 160-270°C, and the temperature of the tenth section was 160-270°C. The temperature of the die head was 200-280°C. The rotation speed of the main machine of the extruder was 100-1200r / min. The mixed material was added into the main hopper of the extruder, and was fed into the first section of the twin-screw extruder through the main feeding loss weight scale. Then, the material was drawn, cut, dried, and the inner layer material particles were prepared.

[0060] After the inner layer material particles were dried and injection molded into sample strips, the related performance test data were obtained, which were shown in the test data part of Table 2.

[0061] Table 2

[0062]

[0063]

[0064] Compared with Example B1, Comparative Example B1 did not add SEBS-g-MAH, and the melt index increased from 1.1 to 52.3, which could not be used for stable extrusion application of pipe;

[0065] Compared with Example B1, the melt index of Comparative Example B2 increased from 1.1 to 79.1, which could not be extruded into a pipe. At the same time, the tensile strength decreased from 7.6MPa to 3.7MPa, the hardness decreased from 61 to 45.7, and the hardness was too low, which caused solution leakage after installing the joint.

[0066] Examples 1-3 and Comparative Examples 1-6 were prepared by a double-layer composite pipe, and the preparation method was as follows:

[0067] According to the parameters in Table 3, a circular straight pipe with an outer diameter of 18 mm and a wall thickness of 1.5 mm is produced by a two-layer pipe extruder. The outer layer uses a 5-zone heating section pipe extruder, the inner layer uses a 5-zone heating pipe extruder, and the die has 3-zone heating. The temperature settings for the outer layer PA modified material are: Zone 1 160-190℃, Zone 2 180-270℃, Zone 3 200-270℃, Zone 4 200-270℃, Zone 5 200-270℃; The temperature settings for the inner layer material are: Zone 1 120-150℃, Zone 2 170-260℃, Zone 3 170-260℃, Zone 4 170-260℃, Zone 5 170-260℃; The temperature settings for the die are: Zone 1 200-280℃, Zone 2 200-280℃, Zone 3 200-280℃, Zone 4 200-280℃, Zone 5 210-280℃.

[0068] The relevant performance test data of the pipe material are shown in Table 3 Test Data section. The adhesion test is specifically operated as follows: take a 10 mm section of pipe material, cut it longitudinally, and then test after peeling.

[0069] Table 3

[0070]

[0071]

[0072] From the two-layer pipe combination table, we can see that:

[0073] Compared with Example 1, the fiber on the surface of the pipe material of Comparative Example 1 is obvious.

[0074] Compared with Example 1, the burst pressure of the pipe material of Comparative Example 2 decreased from 11.3 MPa to 4.7 MPa.

[0075] Compared with Example 1, the pipe material of Comparative Example 3 ruptured at -40℃ low temperature impact.

[0076] Compared with Example 1, the burst pressure of the pipe material of Comparative Example 4 decreased from 11.3 MPa to 4.1 MPa.

[0077] Compared with Example 1, the pipe material of Comparative Example 5 has unstable inner layer extrusion and poor adhesion between the inner and outer layers, which may cause fluid leakage.

[0078] Compared with Example 1, the pipe material of Comparative Example 6 has unstable inner layer extrusion and the inner layer is too soft, which may cause fluid leakage after installing the quick connector.

[0079] In summary, Examples 1, 2 and 3 have good overall performance and can meet the cooling pipe application requirements of high-burst new energy vehicles, energy storage, etc.

[0080] Although the present specification is described in terms of embodiments, not every embodiment exhibits every characteristic or implements every combination of features described in the specification. In addition, the description of the specification is not meant to bind the inventors to a particular interpretation of the description. Rather, the specification is meant to provide a number of examples of embodiments of the present application and the description is merely exemplary of the principles of the application. Accordingly, the scope of the present application is not meant to be limited to the embodiments described in the specification. Rather, the scope of the present application is meant to include any embodiment falling within the scope of the claims.

[0081] The above description is merely illustrative of the embodiments of the present application and is not intended to limit the scope of the application. Rather, the scope of the present application is meant to encompass any variations that can become apparent to one of ordinary skill in the art once given the benefit of this disclosure.

Claims

1. A double-layer composite pipe, characterized by, The outer layer material is prepared from copolyamide 47-87%, toughening agent 5-20%, glass fiber 5-30%, antioxidant A 0.1-3%, and color masterbatch 0-3% by mass percentage. The outer layer material is prepared from copolyamide 47-87%, toughening agent 5-20%, glass fiber 5-30%, antioxidant A 0.1-3%, and color masterbatch 0-3% by mass percentage. The inner layer material is prepared from maleic anhydride grafted SEBS 10-60%, high-viscosity homopolypropylene 8-40%, SEBS 0-34.9%, high-viscosity white oil 15-35%, antioxidant B 0.1-3%, and color masterbatch 0-3%. The copolyamide is a bio-based copolyamide prepared from decanediamine, pentanediamine, and sebacic acid as monomer raw materials, specifically a medium-high viscosity polyamide copolymer, and the relative viscosity of the copolyamide is 2.0-3.3; the preparation method of the copolyamide is as follows: The decanediamine and sebacic acid are added to deionized water to prepare a 30-70% concentration salt solution F1 by heating and stirring; the pentanediamine and sebacic acid are added to deionized water to prepare a 30-70% concentration salt solution F2 by heating and stirring; the salt solution F1 and the salt solution F2 are added to a polymerization kettle in a mass ratio of 4-30:1 to obtain a mixed salt solution; The mixed salt solution is heated to 230-260℃, and first, the polymerization kettle is kept constant pressure nitrogen blowing for 2-5 hours, and then vacuumized at a pressure below 400 Pa for 1-2 hours to obtain a polymerization product, and the viscosity is controlled by controlling the stirring current, and the copolyamide is obtained by strand cutting, drying, and the like.

2. The double-layer composite pipe according to claim 1, characterized by In the outer layer material, the toughening agent is at least one of maleic anhydride grafted POE, maleic anhydride grafted SEBS, and maleic anhydride grafted EPDM.

3. The double-layer composite pipe according to claim 1, characterized by In the outer layer material, the glass fiber is a chopped glass fiber.

4. The double-layer composite pipe according to claim 1, characterized by In the outer layer material, the antioxidant A is compounded from Irganox 1098, Irganox 245, and Irganox 168.

5. The double-layer composite pipe according to claim 1, wherein In the inner layer material, the antioxidant B is compounded from Irganox 1010 and Irganox 168.

6. The double-layer composite pipe according to claim 1, wherein In the inner layer material, the high-viscosity homopolypropylene has a melt index of 0.1-6 g / 10 min at 230℃ and 2.16 kg.

7. The double-layer composite pipe according to claim 1, wherein In the inner layer material, the high viscosity white oil is a naphthenic oil having a kinematic viscosity at 40°C of 100-300 mm 2 / s.

8. The method of producing a double-layer composite pipe according to any one of claims 1 to 7, wherein The method comprises the following steps: S1, blending the copolyamide, the toughening agent, the antioxidant A, and the color masterbatch to obtain a mixture one, placing the mixture one into the main feeding port of a double-screw extruder, placing the glass fiber into the auxiliary feeding port of the double-screw extruder, and performing extrusion, strand drawing, cutting, and drying to obtain the outer layer material; S2, blending the maleic anhydride grafted SEBS, the high-viscosity homopolypropylene, the SEBS, the high-viscosity white oil, the antioxidant B, and the color masterbatch to obtain a mixture two, placing the mixture two into the double-screw extruder after standing for at least 1 hour, and performing strand drawing, cutting, and drying to obtain the inner layer material; S3, placing the outer layer material and the inner layer material into a two-layer extrusion tube machine to perform melt extrusion, and obtaining the double-layer composite tube.

9. The preparation method according to claim 8, wherein In step S1, the temperature of each zone of the double-screw extruder is as follows: the temperature of the first zone is 130-240 DEG C, the temperature of the second zone is 180-280 DEG C, the temperature of the third zone is 180-280 DEG C, the temperature of the fourth zone is 180-280 DEG C, the temperature of the fifth zone is 180-280 DEG C, the temperature of the sixth zone is 180-280 DEG C, the temperature of the seventh zone is 180-280 DEG C, the temperature of the eighth zone is 180-280 DEG C, the temperature of the ninth zone is 180-280 DEG C, and the temperature of the tenth zone is 180-280 DEG C; the temperature of the die head is 200-290 DEG C; and the rotation speed of the main machine is 100-1200 r / min. In step S2, the temperature of each zone of the double-screw extruder is as follows: the temperature of the first zone is 140-200 DEG C, the temperature of the second zone is 160-270 DEG C, the temperature of the third zone is 160-270 DEG C, the temperature of the fourth zone is 160-270 DEG C, the temperature of the fifth zone is 160-270 DEG C, the temperature of the sixth zone is 160-270 DEG C, the temperature of the seventh zone is 160-270 DEG C, the temperature of the eighth zone is 160-270 DEG C, the temperature of the ninth zone is 160-270 DEG C, and the temperature of the tenth zone is 160-270 DEG C; the temperature of the die head is 200-280 DEG C; and the rotation speed of the main machine is 100-1200 r / min. In step S3, a double-layer pipe extruder is used, and the temperature of the outer layer material is set as follows: the temperature of the first zone is 160-190 DEG C, the temperature of the second zone is 180-270 DEG C, the temperature of the third zone is 200-270 DEG C, the temperature of the fourth zone is 200-270 DEG C, and the temperature of the fifth zone is 200-270 DEG C; the temperature of the inner layer material is set as follows: the temperature of the first zone is 120-150 DEG C, the temperature of the second zone is 170-260 DEG C, the temperature of the third zone is 170-260 DEG C, the temperature of the fourth zone is 170-260 DEG C, and the temperature of the fifth zone is 170-260 DEG C; and the temperature of the die head is set as follows: the temperature of the first zone is 200-280 DEG C, the temperature of the second zone is 200-280 DEG C, the temperature of the third zone is 200-280 DEG C, the temperature of the fourth zone is 200-280 DEG C, and the temperature of the fifth zone is 210-280 DEG C.

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