CN117720784A - High-gloss, high-rigidity and high-toughness polypropylene composite material for injection molding product and preparation method thereof - Google Patents
High-gloss, high-rigidity and high-toughness polypropylene composite material for injection molding product and preparation method thereof Download PDFInfo
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- -1 polypropylene Polymers 0.000 title claims abstract description 64
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 61
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 61
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 238000001746 injection moulding Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000004519 manufacturing process Methods 0.000 title description 2
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 25
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims abstract description 10
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 9
- 238000001125 extrusion Methods 0.000 claims abstract description 8
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 230000032683 aging Effects 0.000 claims abstract description 6
- 238000005469 granulation Methods 0.000 claims abstract description 3
- 230000003179 granulation Effects 0.000 claims abstract description 3
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 229920001912 maleic anhydride grafted polyethylene Polymers 0.000 claims description 10
- 239000000155 melt Substances 0.000 claims description 10
- 239000004611 light stabiliser Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 5
- 239000003963 antioxidant agent Substances 0.000 claims description 5
- 230000003078 antioxidant effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 5
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 4
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 3
- VNQNXQYZMPJLQX-UHFFFAOYSA-N 1,3,5-tris[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-1,3,5-triazinane-2,4,6-trione Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CN2C(N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C(=O)N(CC=3C=C(C(O)=C(C=3)C(C)(C)C)C(C)(C)C)C2=O)=O)=C1 VNQNXQYZMPJLQX-UHFFFAOYSA-N 0.000 claims description 2
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000003508 Dilauryl thiodipropionate Substances 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 2
- 230000003712 anti-aging effect Effects 0.000 claims description 2
- 235000019304 dilauryl thiodipropionate Nutrition 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- JKBYAWVSVVSRIX-UHFFFAOYSA-N octadecyl 2-(1-octadecoxy-1-oxopropan-2-yl)sulfanylpropanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)SC(C)C(=O)OCCCCCCCCCCCCCCCCCC JKBYAWVSVVSRIX-UHFFFAOYSA-N 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 8
- 230000000052 comparative effect Effects 0.000 description 9
- 238000013329 compounding Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000002991 molded plastic Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Abstract
The invention discloses a high-gloss, high-rigidity and high-toughness polypropylene composite material for injection molding products, and preparation and application thereof. The high-gloss high-strength polypropylene material comprises the following raw materials in parts by weight: 40-80 parts of general polypropylene, 5-10 parts of ultra-high melt polypropylene, 5-10 parts of ultra-high molecular weight polyethylene powder, 5-30 parts of basalt fiber chopped yarn and 1-5 parts of maleic anhydride grafted polypropylene; 1-5 parts of maleic anhydride grafted polypropylene, 1-5 parts of maleic anhydride grafted POE, 0.3-2 parts of ageing-resistant auxiliary agent, feeding basalt fiber chopped yarn from side, feeding the basalt fiber chopped yarn from a main feeding port of a double-screw extruder, and carrying out melt extrusion and granulation to obtain the basalt fiber chopped yarn. The high-gloss, high-rigidity and high-toughness polypropylene composite material provided by the invention has excellent three dimensions of flexural modulus and notched impact strength of a simply supported beam.
Description
Technical Field
The invention relates to the field of high polymer materials, in particular to a high-gloss, high-rigidity and high-toughness polypropylene composite material for injection molding products and a preparation method thereof
Background
The polypropylene has the advantages of low density, low cost, easy recycling and the like, but has much lower tensile strength and impact toughness compared with engineering plastics such as polycarbonate, polyamide and the like, and greatly limits the application field of the polypropylene. In order to improve the mechanical properties of polypropylene, the polypropylene is generally reinforced by adding glass fibers, basalt fibers and the like, but the reinforced polypropylene has the defects of surface warpage, floating fibers, low gloss and the like.
Many of the existing studies on basalt fiber reinforced polypropylene are based on studying the performance of the system, the compatibility of the system or the cost optimization.
The Chinese patent document with publication number of CN 110483897A discloses a basalt fiber reinforced polypropylene material and a preparation method thereof, wherein the basalt fiber reinforced polypropylene material comprises the following raw materials in percentage by weight: 50-80% of polypropylene resin, 20-50% of basalt fiber, 0.3-0.5% of silane coupling agent, 5-10% of ethylene-octene copolymer grafted maleic anhydride, 1-5% of polypropylene grafted maleic anhydride and 0.5% of lubricant. The silane coupling agent, the ethylene-octene copolymer grafted maleic anhydride (POE-g-MAH) and the polypropylene grafted maleic anhydride (PP-g-MAH) are used for grafting and modifying the polypropylene resin, so that the surface polarity of the polypropylene resin is changed, and the bonding strength of basalt fibers and a polypropylene interface is increased. The performance and cost of the enhancement system are optimized mainly.
Thus, there is still a need for further research on methods of obtaining reinforced polypropylene with more excellent surfaces.
Disclosure of Invention
Aiming at the defects in the art, the invention provides a high-gloss, high-rigidity and high-toughness polypropylene composite material for injection molding products, which has excellent rigidity, toughness and high-gloss surface and can be used in the fields with high requirements on rigidity, toughness and glossiness.
The high-gloss, high-rigidity and high-toughness polypropylene composite material for injection molding products comprises the following raw materials in parts by weight:
40-80 parts of general polypropylene,
5-10 parts of ultra-high melt polypropylene;
5-10 parts of ultra-high molecular weight polyethylene powder,
5-30 parts of basalt fiber chopped yarn,
3-15 parts of a compound compatilizer,
0.1-2 parts of an aging-resistant auxiliary agent.
The compound compatilizer comprises:
1-5 parts of maleic anhydride grafted polyethylene,
1-5 parts of maleic anhydride grafted polypropylene,
1-5 parts of maleic anhydride grafted POE.
According to the invention, the maleic anhydride grafted polyethylene, the maleic anhydride grafted polypropylene and the maleic anhydride grafted POE are compounded to serve as the compatilizer, preferably the maleic anhydride grafted linear low-density polyethylene, and the maleic anhydride grafted linear low-density polyethylene is applied to a specific polypropylene material formula system, and the maleic anhydride grafted polyethylene, the maleic anhydride grafted polypropylene and the maleic anhydride grafted linear low-density polyethylene are compounded to play a role in compatibilization, and simultaneously change the melt rheological property, so that the surface glossiness is influenced, wherein the maleic anhydride grafted polyethylene accounts for 1/4-1/5 of the total amount of the compounded compatilizer, and the surface glossiness is optimal.
The general polypropylene is homo-polypropylene and/or co-polypropylene, and the melt flow rate is 1-50 g/10 min under the test condition of 2.16kg at 230 ℃.
The ultra-high melt index polypropylene is homo-polypropylene, and the melt flow rate is 1500-2500 g/10 min under the test condition of 2.16kg at 230 ℃.
The ultra-high molecular weight polyethylene powder is polyethylene with the molecular weight of more than 100 ten thousand sold in the market and is in a powder shape.
The basalt fiber chopped yarn has the advantages that the diameter of a monofilament is 5.5-25 mu m, the length of the monofilament is 6-100 mm, and a silane coupling agent is coated on the surface of the basalt fiber chopped yarn.
The aging-resistant auxiliary agent is at least one of an antioxidant and a light stabilizer. The antioxidant can be one or more than two of pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tri (2, 4-di-tert-butylphenyl) phosphite, dioctadecyl thiodipropionate, dilauryl thiodipropionate, 1,3, 5-tri (3, 5-di-tert-butyl-4-hydroxybenzyl) isocyanuric acid and n-stearyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate. The light stabilizer may be selected from the group consisting of the German Pasteur light stabilizer 855. The aging-resistant auxiliary agent is preferably a compound antioxidant system.
In the injection molding process, the injection speed parameter is set to be low, the injection speed is 10% -25% (the percentage of the highest speed in the injection speed parameter of the injection molding machine), and the injection quantity is not more than 3g/s.
It has been found that under the conditions described above, the polypropylene material obtained has excellent mechanical properties and a high surface gloss.
The invention also provides a preparation method of the high-gloss, high-rigidity and high-toughness polypropylene composite material, which comprises the following steps:
(1) Mixing and uniformly stirring the raw materials except the basalt fiber chopped yarn according to a proportion, wherein the stirring speed is 80-90 rpm, and the stirring time is 10-15 min;
(2) Adding the mixture obtained in the step (1) from a main feeding port of a double-screw extruder, adding basalt fiber chopped yarn through side feeding (the side feeding position is one half of the extruder), and carrying out melt extrusion and granulation to obtain the high-gloss, high-rigidity and high-toughness polypropylene composite material.
In the step (2), the blanking speed of the main feed is 20+/-5 Hz, the temperature of the melt extrusion is 170-240 ℃, and the rotating speed of a main machine of the double-screw extruder is 300-500 revolutions per minute.
In the step (2), the specific distribution of the temperature of the melt extrusion is as follows: 180+ -10 ℃ in the first region, 200+ -10 ℃ in the second region, 220+ -10 ℃ in the third region, and 230+ -10 ℃ in the fourth to ninth regions.
The high-gloss, high-rigidity and high-toughness polypropylene composite material is suitable for the field of injection molding plastic products with requirements on high gloss, high rigidity and high toughness.
Compared with the prior art, the invention has the main advantages that: the invention uses ultra-high molecular weight polyethylene and basalt fiber chopped yarn as fillers to strengthen the rigidity and toughness of polypropylene materials; the ultra-high melt index polypropylene with extremely high fluidity is creatively added, and the ultra-high melt index polypropylene with high gloss and high fluidity is more enriched on the surface of a manufactured part, so that the surface with high gloss and high flatness is provided; the ultra-high molecular weight polyethylene and basalt fiber chopped yarn system is enriched in the interior of the product, and provides the composite material with extremely high mechanical strength and toughness, and meanwhile, attention is paid to the fact that the injection molding speed needs to be kept at a low speed in order to prevent the composite material from layering. By compounding the compatilizer and the proportion thereof, the unexpected discovery of compounding three common compatilizers only has great influence on the glossiness of the surface when the ratio of the maleic anhydride grafted polyethylene in the compounding compatilizer is within a certain range. The composite material obtained according to the method and the requirement disclosed by the invention is excellent in three dimensions of flexural modulus, notched impact strength of a simply supported beam and glossiness.
Description of the embodiments
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The methods of operation, under which specific conditions are not noted in the examples below, are generally in accordance with conventional conditions, or in accordance with the conditions recommended by the manufacturer.
The formulations of examples 1 to 6 and comparative examples 1 to 3 are shown in Table 1;
other raw materials except the fibers are stirred in a stirring pot for 10 minutes according to the formula, the raw materials are put into an extruder hopper after being uniformly mixed, the raw materials are melted and blended by a double-screw extruder, basalt fiber chopped yarns are added by side feeding, the extrusion temperature is controlled to be 170-240 ℃ to prepare the high-gloss, high-rigidity and high-toughness polypropylene composite material, and various raw material sources are selected from the materials listed in table 2.
The polypropylene material thus obtained was dried in a forced air drying oven at 85℃for 2 hours, and then test bars were injection molded by an injection molding machine at an injection molding speed of 20% for examples 1 to 5 and comparative examples 1 to 3 and at an injection molding speed of 45% for example 6. Flexural modulus testing was performed according to GB/T9341 178 at a speed of 2 mm/min; the notch impact strength of the simply supported beam is implemented according to the GB/T1043.1 standard, and the pendulum bob is 3.75J; the surface gloss was measured at 60℃according to GB/T9754 standard. The test performance data are shown in Table 3 below, the data are retained for a significant number of bits, and the performance test results are shown in Table 3.
Table 1 formulation components
| Component (A) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Universal polypropylene | 65.4 | 65.4 | 65.4 | 65.4 | 65.4 | 65.4 | 72.4 | 72.4 | 72.4 |
| Ultra-high melt index polypropylene | 7 | 7 | 7 | 7 | 7 | 7 | 0 | 7 | 7 |
| Ultra-high molecular weight polyethylene powder | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Basalt fiber chopped yarn | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Maleic anhydride grafted polyethylene | 0.8 | 1 | 1.2 | 1.6 | 1 | 1 | 1 | 0 | 1 |
| Maleic anhydride grafted polypropylene | 2.1 | 2 | 1.9 | 1.7 | 2 | 2 | 2 | 2.5 | 4 |
| Maleic anhydride grafted POE | 2.1 | 2 | 1.9 | 1.7 | 2 | 2 | 2 | 2.5 | 0 |
| Aging-resistant auxiliary agent | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 |
TABLE 2 raw materials manufacturer's brand
| Component (A) | Raw material manufacturer and brand information |
| Polypropylene | The melt flow rate of the middle sea shell homo-polypropylene HP840N-Z was 12 g/10 min (230 ℃,2.16 kg) |
| Ultra-high melt index polypropylene | Basel polypropylene MF650Y melt flow rate of 1800 g/10 min (230 ℃,2.16 kg) |
| Ultra-high molecular weight polyethylene powder | Ultra-high molecular weight polyethylene brand 2126, molecular weight 150 ten thousand of Seranis in U.S |
| Maleic anhydride grafted polyethylene | Examples 1-4, example 6 and comparative example LLDPE-g-MAH Yi Rong CMG5904, example 5 HDPE-g-MAH Yi Rong CMG5804 |
| Maleic anhydride grafted polypropylene | Best Yi Rong MPP 9801 |
| Maleic anhydride grafted POE | Ketong KT 915B |
| Basalt fiber chopped yarn | Jiangsu Gelong basalt fiber chopped yarn BCS7-22 with diameter of 7 mu m and silane coupling agent infiltration |
| Anti-aging agent | The German basf antioxidant 168, 1076 and the light stabilizer 855 are compounded according to the mass ratio of 2:3:2 |
TABLE 3 Performance test results
| Performance index | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example1 | Comparative example 2 | Comparative example 3 |
| Flexural modulus (MPa) | 5017 | 5321 | 5412 | 5583 | 5354 | 5386 | 5311 | 4810 | 5853 |
| Notched impact strength of simply supported beam (kJ/m 2) | 30 | 28 | 28 | 27 | 29 | 25 | 26 | 30 | 19 |
| Surface gloss (°) | 32 | 60 | 58 | 33 | 42 | The surface of the molded plastic is peeled and layered, and the molded plastic cannot be tested. | 21 | 30 | 29 |
Further, it will be understood that various changes and modifications may be made by those skilled in the art after reading the foregoing description of the invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (10)
1. The high-gloss, high-rigidity and high-toughness polypropylene composite material for injection molding products comprises the following raw materials in parts by weight:
40-80 parts of general polypropylene,
5-10 parts of ultra-high melt polypropylene;
5-10 parts of ultra-high molecular weight polyethylene powder,
5-30 parts of basalt fiber chopped yarn,
3-15 parts of a compound compatilizer,
0.1-2 parts of an anti-aging auxiliary agent;
the compound compatilizer comprises:
1-5 parts of maleic anhydride grafted polyethylene,
1-5 parts of maleic anhydride grafted polypropylene,
1-5 parts of maleic anhydride grafted POE;
the maleic anhydride grafted polyethylene accounts for 1/4-1/5 of the total amount of the compound compatilizer.
2. The high gloss, high rigidity and high toughness polypropylene composite material for injection molded articles according to claim 1, wherein said maleic anhydride grafted polyethylene is a maleic anhydride grafted linear low density polyethylene.
3. The high-gloss, high-rigidity and high-toughness polypropylene composite material for injection molded articles according to claim 1, wherein the general polypropylene is homo-polypropylene and/or co-polypropylene, and the melt flow rate under the test condition of 2.16kg at 230 ℃ is 1-50 g/10 min.
4. The high-gloss, high-rigidity and high-toughness polypropylene composite material for injection molded articles according to claim 1, wherein the ultra-high melt polypropylene is homo-polypropylene, and the melt flow rate under the test condition of 2.16kg at 230 ℃ is 1500-2500 g/10 min.
5. The high gloss, high rigidity and high toughness polypropylene composite material for injection molded articles according to claim 1, wherein said ultra high molecular weight polyethylene powder is commercially available polyethylene having a molecular weight of more than 100 ten thousand in powder form.
6. The high-gloss, high-rigidity and high-toughness polypropylene composite material for injection molded articles according to claim 1, wherein the basalt fiber chopped yarn has a monofilament diameter of 5.5-25 μm and a length of 6-100 mm, and the surface is coated with a silane coupling agent.
7. The high-gloss, high-rigidity and high-toughness polypropylene composite material for injection molded articles according to claim 1, wherein said aging-resistant auxiliary agent is at least one of an antioxidant and a light stabilizer; the antioxidant is one or more than two of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester, tri (2, 4-di-tert-butylphenyl) phosphite, dioctadecyl thiodipropionate, dilauryl thiodipropionate, 1,3, 5-tri (3, 5-di-tert-butyl-4-hydroxybenzyl) isocyanuric acid and beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate n-stearyl alcohol ester; the light stabilizer is selected from the group consisting of the German Basoff light stabilizer 855.
8. The high gloss, high rigidity and high toughness polypropylene composite material for injection molded articles according to claim 1, wherein the injection molding speed parameter is set to be low speed, the injection molding speed is 10% -25%, and the injection molding amount is not more than 3g/s.
9. The method for preparing a high gloss, high rigidity and high toughness polypropylene composite material according to claim 1, comprising the steps of:
(1) Mixing and uniformly stirring the raw materials except the basalt fiber chopped yarn according to a proportion, wherein the stirring speed is 80-90 rpm, and the stirring time is 10-15 min;
(2) Adding the mixture obtained in the step (1) from a main feeding port of a double-screw extruder, adding basalt fiber chopped yarn through side feeding (the side feeding position is one half of the extruder), and carrying out melt extrusion and granulation to obtain the high-gloss, high-rigidity and high-toughness polypropylene composite material.
10. The method for preparing a high-gloss, high-rigidity and high-toughness polypropylene composite material according to claim 9, wherein in the step (2), the blanking speed of the main feed is 20±5 Hz, the temperature of the melt extrusion is 170 ℃ to 240 ℃, and the host rotation speed of the twin-screw extruder is 300 rpm to 500 rpm; in the step (2), the specific distribution of the temperature of the melt extrusion is as follows: 180+ -10 ℃ in the first region, 200+ -10 ℃ in the second region, 220+ -10 ℃ in the third region, and 230+ -10 ℃ in the fourth to ninth regions.
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