A PC-based building formwork material with a wide temperature range and its production method

Abstract

This application discloses a PC-based building formwork material with a wide operating temperature range and its production method, belonging to the technical field of building formwork materials. The PC-based building formwork material with a wide operating temperature range is characterized by comprising, by weight, 60-80 parts of polycarbonate, 10-15 parts of modified polyetheretherketone (PEEK), 10-20 parts of silicone rubber, 3-5 parts of compatibility additive, 0.3-0.5 parts of antioxidant, and 0.2-0.5 parts of light stabilizer; the modified PEEK is prepared by modifying PEEK with maleic anhydride. By using a specific ratio of modified PEEK, silicone rubber, and polycarbonate, the high-temperature and low-temperature resistance of the building formwork material is improved while ensuring the compatibility of the matrix, thus widening the operating temperature range of the PC-based building formwork material; the addition of compatibility additive further enhances the overall compatibility, avoids phase separation, and improves the overall consistency and stability of the material.

Description

Technical Field

[0001] This application relates to a PC-based building formwork material with a wide temperature range and its production method, belonging to the technical field of building formwork materials. Background Technology

[0002] Formwork systems play a crucial role in current building construction processes. Choosing appropriate formwork can effectively improve construction efficiency and achieve sustainable construction. Formwork refers to the temporary structural support for concrete until it solidifies and takes shape according to the designed dimensions and geometry. During this process, the formwork must withstand its own weight and external loads during construction.

[0003] Traditional construction formwork mainly uses wood, steel, and aluminum alloy. Wood formwork is susceptible to humidity, leading to deformation, mold, and corrosion. It has poor durability and limited strength and load-bearing capacity. Although steel formwork is sturdy, it is prone to wear and corrosion, reducing formwork stability and contaminating the concrete surface, and it is also expensive. Aluminum alloy formwork has poor plasticity and requires the use of release agents. Therefore, composite material formwork has gradually been proposed.

[0004] Polycarbonate (PC) is a thermoplastic engineering plastic containing carbonate groups in its molecular chain, with a wide molecular weight distribution, typically ranging from 32,000 to 115,000. PC is an amorphous resin that does not easily crystallize, possessing good heat and low-temperature resistance. It exhibits good mechanical properties, flame retardancy, and dimensional stability over a wide temperature range and can be used for extended periods at temperatures from -40°C to 125°C. However, existing PC composite materials have weak low-temperature resistance, are prone to micro-tears, and are susceptible to molecular chain breakage, leading to product cracking. This significantly reduces their mechanical properties in low-temperature environments, severely limiting the application of PC composite building formwork.

[0005] To address the aforementioned issues, existing technologies propose using modified PC materials with excellent heat resistance, impact resistance, dimensional stability, and processing fluidity to prepare building formwork. For example, PC / ABS materials possess excellent heat resistance, impact resistance, dimensional stability, and processing fluidity; however, they are prone to embrittlement around 0°C, and their performance gradually declines after 2-3 years of prolonged outdoor exposure. Therefore, providing a material with excellent mechanical properties while broadening the operating temperature range of PC-based building formwork could significantly expand its applications. Summary of the Invention

[0006] To address the aforementioned issues, a PC-based building formwork material with a wide operating temperature range and its preparation method are provided. This PC-based building formwork material with a wide operating temperature range improves the high-temperature and low-temperature resistance of the building formwork material and broadens its operating temperature range by using a specific ratio of modified polyether ether ketone, silicone rubber, and polycarbonate. This ensures the compatibility of the matrix while expanding the high-temperature and low-temperature resistance of the building formwork material. The addition of compatibility additives further enhances the overall compatibility, prevents phase separation, and improves the overall consistency and stability of the material.

[0007] According to one aspect of this application, a PC-based building template material with a wide temperature range is provided, comprising, by weight, 60-80 parts of polycarbonate, 10-15 parts of modified polyetheretherketone, 10-20 parts of silicone rubber, 3-5 parts of compatibility additive, 0.3-0.5 parts of antioxidant, and 0.2-0.5 parts of light stabilizer; wherein the modified polyetheretherketone is prepared by modifying polyetheretherketone with maleic anhydride.

[0008] Specifically, this application modifies polyetheretherketone (PEEK) with maleic anhydride to introduce carboxyl functional groups into its molecular chain, which can improve the compatibility of PEEK in PC-based building template materials. On the one hand, the introduced carboxyl groups can undergo esterification with the hydroxyl groups of PC, enhance the linkage with PC groups, and improve the compatibility and stability of the entire system.

[0009] Optionally, the preparation method of the modified polyether ether ketone includes the following steps:

[0010] S1 Place polyetheretherketone particles in a reaction vessel, add DMF, stir until homogeneous, add maleic anhydride and initiator, and heat to react under nitrogen protection;

[0011] After the S2 reaction is completed, the mixture is filtered, washed, and dried to obtain modified polyether ether ketone.

[0012] Optionally, in S1, the reaction temperature is 100–120°C, and the reaction time is 4–6 h; the mass of the maleic anhydride is 5–10% of the mass of polyetheretherketone, and the mass of the initiator is 0.5–1% of the mass of polyetheretherketone; the initiator includes benzoyl peroxide.

[0013] Specifically, this application specifies the preparation method of modified polyetheretherketone (PEEK). On the one hand, under the action of an initiator, the unsaturated bonds of maleic anhydride undergo a free radical addition reaction with the active sites on the PEEK molecular chain, introducing carboxyl groups. On the other hand, this application specifies the modification method and the amount of each component. If the amount of maleic anhydride is too high, it will result in maleic anhydride residue, affecting the stability of the material. If the amount of maleic anhydride is too low, it will affect the modification effect, resulting in insufficient reactive sites with PC and reduced compatibility.

[0014] Optionally, the compatibility additive includes glycidyl methacrylate-butyl acrylate copolymer or glycidyl methacrylate-methyl methacrylate-butyl acrylate terpolymer; the silicone rubber includes methyl silicone rubber or methyl vinyl silicone rubber.

[0015] Specifically, this application specifies the selection of compatibility additives and silicone rubber. On one hand, the compatibility additives include glycidyl methacrylate-butyl acrylate copolymers or glycidyl methacrylate-methyl methacrylate-butyl acrylate terpolymers, which introduce epoxy functional groups into the acrylate polymer molecular chain. These additives possess the film-forming properties and flexibility of acrylate polymers, as well as their affinity for various organic materials, while also exhibiting the high reactivity of epoxy groups. When the compatibility additives are mixed with polycarbonate, modified polyetheretherketone, and silicone rubber, the epoxy groups interact with each component to construct a network structure, further enhancing the system's compatibility. On the other hand, silicone rubber possesses excellent flexibility. Its main chain structure composed of silicon-oxygen bonds gives it good thermal stability, allowing it to withstand extreme low temperatures. Its glass transition temperature is generally -60°C or even lower, remaining soft and elastic even in cold environments without hardening or becoming brittle, thus greatly improving the low-temperature resistance of PC-based building formwork materials.

[0016] Optionally, the polycarbonate may further include modified polycarbonate obtained by graft copolymerization of the polycarbonate with a vinyl-containing polysiloxane monomer.

[0017] Specifically, by modifying polycarbonate with vinyl-containing polysiloxane monomers, polysiloxane segments are grafted onto the PC molecular chain. The siloxane segments can be better compatible with silicone rubber and can improve the heat resistance, weather resistance and other properties of PC, making it more stable in a wide temperature range environment.

[0018] Optionally, the preparation of the modified polycarbonate includes the following steps:

[0019] S01 Add polycarbonate to toluene, dissolve it, add polysiloxane monomer containing vinyl groups, stir evenly, add initiator, and react under nitrogen atmosphere by heating.

[0020] After the SO2 reaction is completed, the modified polycarbonate is obtained by alcohol precipitation, filtration, washing and drying.

[0021] Optionally, the vinyl-containing polysiloxane monomer is a vinyl-terminated polydimethylsiloxane, and the initiator is benzoyl peroxide; the reaction temperature in SO1 is 120-150°C, and the reaction time is 4-6 hours.

[0022] Specifically, the mass of the vinyl-terminated polydimethylsiloxane is 10% to 20% of the mass of the polycarbonate, and the mass of the initiator is 1% to 2% of the mass of the polycarbonate.

[0023] Optionally, the antioxidant includes antioxidant 1010 and antioxidant 168; the light stabilizer includes UV637 or UV981.

[0024] Specifically, the mass ratio of antioxidant 1010 to antioxidant 168 is (2-5):1.

[0025] Specifically, this application uses two antioxidants compounded in a specific ratio, which work together with other components of this application to improve the weather resistance of PC-based building formwork materials and extend their service life.

[0026] According to another aspect of this application, a method for producing the above-mentioned PC-based building formwork material with a wide temperature range is also provided, comprising the following steps:

[0027] (1) Weigh out polycarbonate, modified polyether ether ketone, silicone rubber, compatibility additive, antioxidant and light stabilizer according to the weight parts and add them to a high-speed mixer and mix evenly to obtain a premix;

[0028] (2) The premixed material is melted, extruded and granulated by a twin-screw extruder to obtain PC-based building template material granules with a wide operating temperature range;

[0029] (3) Injection molding is performed on PC-based building formwork material particles with a wide temperature range to obtain PC-based building formwork material with a wide temperature range.

[0030] Optionally, in step (1), the high-speed mixer speed is 500-700 rpm and the stirring time is 15-20 min; in step (2), the twin-screw extruder is divided into a feeding section, a plasticizing section and a metering section for granulation, wherein the temperature of the feeding section is 180-200℃, the temperature of the plasticizing section is 220-240℃ and the temperature of the metering section is 240-260℃; in step (3), during injection molding, the mold temperature is 50-80℃, the injection pressure is 80-100 bar, the holding time is 15-20 s and the cooling time is 90-110 s.

[0031] Specifically, this application defines the production steps and process parameters of the production method for PC-based building formwork materials with a wide temperature range, so as to obtain PC-based building formwork materials with a wide temperature range.

[0032] The beneficial effects of this application include, but are not limited to:

[0033] 1. The PC-based building formwork material with a wide operating temperature range according to this application improves the high-temperature and low-temperature resistance of the building formwork material and broadens the operating temperature range of the PC-based building formwork material by using a specific ratio of modified polyether ether ketone, silicone rubber and polycarbonate. The addition of compatibility additives further enhances the overall compatibility, avoids phase separation, and improves the overall consistency and stability of the material.

[0034] 2. According to the PC-based building formwork material with a wide operating temperature range of this application, maleic anhydride is used to modify polyetheretherketone (PEEK) and introduce carboxyl functional groups into its molecular chain. This can improve the compatibility of PEEK in PC-based building formwork materials. On the one hand, the introduced carboxyl groups can undergo esterification with the hydroxyl groups of PC, enhance the linkage with PC groups, and improve the compatibility and stability of the entire system.

[0035] 3. According to the PC-based building formwork material with a wide operating temperature range of this application, specific limitations are made on the silicone rubber and compatibility additives to increase the interaction between the components and improve the overall high-temperature resistance and low-temperature resistance of the material, so that it has a wider operating temperature range.

[0036] 4. The production method of PC-based building formwork material with a wide temperature range according to this application is simple, the raw materials are readily available, it is easy to promote and utilize, and it saves costs. Detailed Implementation

[0037] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0038] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application were all purchased commercially.

[0039] Unless otherwise specified, the methods used in the embodiments and comparative examples of this application are conventional methods in the prior art.

[0040] Example 1

[0041] A method for producing PC-based building formwork material with a wide temperature range:

[0042] (1) Weigh out 60 parts of polycarbonate, 10 parts of modified polyether ether ketone, 10 parts of silicone rubber methyl silicone rubber, 3 parts of compatibility agent glycidyl methacrylate-butyl acrylate copolymer, 0.3 parts of antioxidant 1010 and antioxidant 168 and 0.2 parts of light stabilizer UV637 according to the following weight ratios and add them to a high-speed mixer and mix evenly. The mass ratio of antioxidant 1010 to antioxidant 168 is 2:1. The speed of the high-speed mixer is 500 rpm and the stirring time is 15 min; to obtain the premix.

[0043] (2) The premixed material is melted, extruded and granulated through a twin-screw extruder. The twin-screw extruder is divided into a feeding section, a plasticizing section and a metering section during granulation. The temperature of the feeding section is 180°C, the temperature of the plasticizing section is 220°C and the temperature of the metering section is 240°C. PC-based building template material granules with a wide operating temperature range are obtained.

[0044] (3) The PC-based building template material particles with a wide temperature range are injection molded. During the injection molding process, the mold temperature is 50°C, the injection pressure is 80 bar, the holding time is 15 s, and the cooling time is 90 s; thus, a PC-based building template material with a wide temperature range is obtained.

[0045] The preparation method of modified polyether ether ketone includes the following steps:

[0046] S1. Place polyetheretherketone (PEEK) particles in a reaction vessel, add DMF, stir until homogeneous, add maleic anhydride and initiator benzoyl peroxide, and under nitrogen protection, heat the reaction to 100°C for 4 hours; the mass of maleic anhydride is 5% of the mass of PEEK, and the mass of initiator is 0.5% of the mass of PEEK.

[0047] After the S2 reaction is completed, the mixture is filtered, washed, and dried to obtain modified polyether ether ketone.

[0048] Example 2

[0049] A method for producing PC-based building formwork material with a wide temperature range:

[0050] (1) Weigh out 80 parts of polycarbonate, 15 parts of modified polyetheretherketone, 20 parts of silicone rubber methyl vinyl silicone rubber, 5 parts of compatibility aid glycidyl methacrylate-methyl methacrylate-butyl acrylate terpolymer, 0.5 parts of antioxidant 1010 and antioxidant 168 and 0.5 parts of light stabilizer UV981 according to the following weight proportions and add them to a high-speed mixer and mix evenly. The mass ratio of antioxidant 1010 to antioxidant 168 is 5:1. The speed of the high-speed mixer is 700 rpm and the stirring time is 20 min; to obtain the premix.

[0051] (2) The premixed material is melted, extruded and granulated through a twin-screw extruder. The twin-screw extruder is divided into a feeding section, a plasticizing section and a metering section during granulation. The temperature of the feeding section is 200°C, the temperature of the plasticizing section is 240°C and the temperature of the metering section is 260°C. PC-based building template material granules with a wide operating temperature range are obtained.

[0052] (3) The PC-based building template material particles with a wide temperature range are injection molded. During the injection molding process, the mold temperature is 80℃, the injection pressure is 100 bar, the holding time is 20s, and the cooling time is 110s; thus, a PC-based building template material with a wide temperature range is obtained.

[0053] The preparation method of modified polyether ether ketone includes the following steps:

[0054] S1. Place polyetheretherketone (PEEK) particles in a reaction vessel, add DMF, stir until homogeneous, add maleic anhydride and initiator benzoyl peroxide, and under nitrogen protection, heat the reaction to 120°C for 6 hours; the mass of maleic anhydride is 10% of the mass of PEEK, and the mass of initiator is 1% of the mass of PEEK.

[0055] After the S2 reaction is completed, the mixture is filtered, washed, and dried to obtain modified polyether ether ketone.

[0056] Example 3

[0057] A method for producing PC-based building formwork material with a wide temperature range:

[0058] (1) Weigh out 70 parts of polycarbonate, 12 parts of modified polyetheretherketone, 15 parts of methyl vinyl silicone rubber, 4 parts of compatibility aid glycidyl methacrylate-butyl acrylate copolymer, 0.4 parts of antioxidant 1010 and antioxidant 168 and 0.3 parts of light stabilizer UV637 according to the following weight ratios and add them to a high-speed mixer and mix evenly. The mass ratio of antioxidant 1010 to antioxidant 168 is 3:1. The speed of the high-speed mixer is 600 rpm and the stirring time is 20 min; a premix is ​​obtained.

[0059] (2) The premixed material is melted, extruded and granulated through a twin-screw extruder. The twin-screw extruder is divided into a feeding section, a plasticizing section and a metering section during granulation. The temperature of the feeding section is 200°C, the temperature of the plasticizing section is 230°C and the temperature of the metering section is 250°C. PC-based building template material granules with a wide operating temperature range are obtained.

[0060] (3) The PC-based building template material particles with a wide temperature range are injection molded. During the injection molding process, the mold temperature is 60℃, the injection pressure is 90 bar, the holding time is 20s, and the cooling time is 100s; thus, a PC-based building template material with a wide temperature range is obtained.

[0061] The preparation method of modified polyether ether ketone includes the following steps:

[0062] S1. Place polyetheretherketone (PEEK) particles in a reaction vessel, add DMF, stir until homogeneous, add maleic anhydride and initiator benzoyl peroxide, and under nitrogen protection, raise the temperature to 110°C and react for 5 hours; the mass of maleic anhydride is 8% of the mass of PEEK, and the mass of initiator is 0.7% of the mass of PEEK.

[0063] After the S2 reaction is completed, the mixture is filtered, washed, and dried to obtain modified polyether ether ketone.

[0064] Example 4

[0065] Compared with Example 3, Example 4 further includes a process of modifying polycarbonate. The preparation of modified polycarbonate specifically includes the following steps:

[0066] S01. Polycarbonate was added to toluene and dissolved. Vinyl-terminated polydimethylsiloxane was then added, and the mixture was stirred until homogeneous. Benzoyl peroxide, the initiator, was then added. The mass of the vinyl-terminated polydimethylsiloxane was 10% of the mass of the polycarbonate, and the mass of the initiator was 1% of the mass of the polycarbonate. The reaction was carried out under a nitrogen atmosphere at 150°C for 6 hours.

[0067] After the SO2 reaction is completed, the modified polycarbonate is obtained by alcohol precipitation, filtration, washing and drying.

[0068] Example 5

[0069] The difference between Example 5 and Example 3 is that Example 5 also includes a process of modifying polycarbonate. The preparation of modified polycarbonate specifically includes the following steps:

[0070] S01. Polycarbonate was added to toluene and dissolved. Vinyl-terminated polydimethylsiloxane was then added, and the mixture was stirred until homogeneous. Benzoyl peroxide, the initiator, was then added. The mass of the vinyl-terminated polydimethylsiloxane was 20% of the mass of the polycarbonate, and the mass of the initiator was 2% of the mass of the polycarbonate. The reaction was carried out under a nitrogen atmosphere at 120°C for 4 hours.

[0071] After the SO2 reaction is completed, the modified polycarbonate is obtained by alcohol precipitation, filtration, washing and drying.

[0072] Example 6

[0073] The difference between Example 6 and Example 3 is that the antioxidant only includes antioxidant 1010 0.4 parts, while the rest are the same.

[0074] Example 7

[0075] The difference between Example 7 and Example 3 is that the antioxidant only includes antioxidant 168 0.4 parts, while the rest are the same.

[0076] Comparative Example 1

[0077] The difference between Comparative Example 1 and Example 3 is that polyetheretherketone is used instead of modified polyetheretherketone; otherwise, they are the same.

[0078] Comparative Example 2

[0079] The difference between Comparative Example 2 and Example 3 is that butadiene rubber is used instead of silicone rubber methyl vinyl silicone rubber, while the rest are the same.

[0080] Comparative Example 3

[0081] The difference between Comparative Example 3 and Example 3 is that Comparative Example 3 does not include compatibility additives, but all other aspects are the same.

[0082] Experimental Example 1

[0083] The performance of a PC-based building formwork material with a wide temperature range prepared in Examples 1-7 and Comparative Examples 1-3 was tested using the following methods:

[0084] Tensile strength: Tested according to ISO 527 standard, at a test speed of 50 mm / min;

[0085] Bending strength: Tested according to ISO 178 standard, test speed 2mm / min;

[0086] Low-temperature impact strength: Tested according to ISO 179-1:2010(E) standard, at a test temperature of -30℃;

[0087] Oxidation induction period: Tested according to GB / T 19466.6-2009 standard, the test temperature is 180℃;

[0088] Heat distortion temperature: 1.82 MPa, tested according to ISO 75 standard.

[0089] The test results are shown in Table 1.

[0090] Table 1 Performance Test Results

[0091]

[0092] Experiment Example 2

[0093] Test strips were made from a PC-based building template material with a wide temperature range prepared in Examples 1-7 and Comparative Examples 1-3 of this application. The strips were 120 mm long, 10 mm wide, and 4 mm thick. The strips were placed in an aging chamber with ultraviolet light from a 1000W high-pressure mercury lamp at 80°C and continuously irradiated for 1000 h. The decrease rate of tensile strength and flexural strength after ultraviolet irradiation compared to before irradiation was tested. The test results are shown in Table 2.

[0094] Table 2 Results of UV Aging Test

[0095]

[0096]

[0097] As shown in Tables 1 and 2, the PC-based building template material with a wide operating temperature range provided in this application has good mechanical properties, as well as good high-temperature and low-temperature resistance. Furthermore, its mechanical properties show minimal decline after ultraviolet aging testing. Compared to Examples 1-3, Examples 4 and 5 used modified polycarbonate, resulting in improved performance across the board. Comparative Example 1 did not use modified polyetheretherketone, leading to a significant decrease in its performance. Comparative Example 2 changed the type of rubber added, resulting in a significant decrease in performance.

[0098] The above description is merely an embodiment of this application, and the scope of protection of this application is not limited to these specific embodiments, but is determined by the claims of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the technical concept and principles of this application should be included within the scope of protection of this application.

Claims

1. A PC-based building formwork material with a wide temperature range, characterized in that, The product comprises, by weight, 60-80 parts of polycarbonate, 10-15 parts of modified polyetheretherketone, 10-20 parts of silicone rubber, 3-5 parts of compatibility additives, 0.3-0.5 parts of antioxidants, and 0.2-0.5 parts of light stabilizers; The modified polyether ether ketone is prepared by modifying polyether ether ketone with maleic anhydride, and the preparation method includes the following steps: S1 Place polyetheretherketone particles in a reaction vessel, add DMF, stir until homogeneous, add maleic anhydride and initiator, and heat to react under nitrogen protection; After the S2 reaction is completed, the mixture is filtered, washed, and dried to obtain the modified polyether ether ketone. The reaction temperature in S1 is 100~120℃, and the reaction time is 4~6h; the mass of the maleic anhydride is 5~10% of the mass of polyetheretherketone, and the mass of the initiator is 0.5~1% of the mass of polyetheretherketone; the initiator includes benzoyl peroxide.

2. The PC-based building formwork material with a wide temperature range according to claim 1, characterized in that, The compatibility additives include glycidyl methacrylate-butyl acrylate copolymer or glycidyl methacrylate-methyl methacrylate-butyl acrylate terpolymer; the silicone rubber includes methyl silicone rubber or methyl vinyl silicone rubber.

3. The PC-based building formwork material with a wide temperature range according to claim 1, characterized in that, The polycarbonate also includes modified polycarbonate obtained by graft copolymerization of polycarbonate with a vinyl-containing polysiloxane monomer.

4. The PC-based building formwork material with a wide temperature range according to claim 3, characterized in that, The preparation of the modified polycarbonate includes the following steps: S01 Add polycarbonate to toluene, dissolve it, add polysiloxane monomer containing vinyl groups, stir evenly, add initiator, and react under nitrogen atmosphere by heating. After the SO2 reaction is completed, the modified polycarbonate is obtained by alcohol precipitation, filtration, washing and drying.

5. The PC-based building formwork material with a wide temperature range according to claim 4, characterized in that, The vinyl-containing polysiloxane monomer is vinyl-terminated polydimethylsiloxane, and the initiator is benzoyl peroxide; the reaction temperature in SO1 is 120~150℃, and the reaction time is 4~6h.

6. The PC-based building formwork material with a wide temperature range according to claim 4, characterized in that, The antioxidants include antioxidant 1010 and antioxidant 168; the light stabilizers include UV637 or UV981.

7. The method for producing PC-based building formwork material with a wide temperature range as described in any one of claims 1 to 6, characterized in that, Includes the following steps: (1) Weigh out polycarbonate, modified polyether ether ketone, silicone rubber, compatibilizer, antioxidant and light stabilizer according to the weight parts and add them to a high-speed mixer and mix evenly to obtain a premix; (2) The premixed material is melted, extruded and granulated by a twin-screw extruder to obtain PC-based building template material granules with a wide operating temperature range; (3) Injection molding is performed on PC-based building formwork material particles with a wide temperature range to obtain PC-based building formwork material with a wide temperature range.

8. The method for producing PC-based building formwork material with a wide temperature range according to claim 7, characterized in that, In step (1), the high-speed mixer rotates at 500-700 rpm and the mixing time is 15-20 min. In step (2), the twin-screw extruder is divided into a feeding section, a plasticizing section, and a metering section for granulation. The temperature of the feeding section is 180-200℃, the temperature of the plasticizing section is 220-240℃, and the temperature of the metering section is 240-260℃. In step (3), the mold temperature is 50-80℃, the injection pressure is 80-100 bar, the holding time is 15-20 s, and the cooling time is 90-110 s.

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