A polymer regeneration modification method based on wide frequency range hydraulic pressure and ultrasonic dynamic physical field regulation

Abstract

This invention belongs to the field of polymer material recycling technology and discloses a polymer regeneration modification method based on broadband hydraulic and ultrasonic dynamic physical field control. This invention integrates an optimized single physical field action mode with an innovative composite mode into a complete and selectable process system. Users can flexibly select the most economical and effective mode according to the actual condition of the waste polymer raw materials, such as aging degree and pollution status, realizing intelligent and highly adaptable process strategies and constructing a complete and selectable process system. By defining the effective and safe working parameter windows of the hydraulic vibration field and the ultrasonic oscillation field, the application of either physical field alone becomes more controllable and efficient. It creatively proposes a composite synergistic mode that simultaneously applies ultrasonic oscillation fields and hydraulic vibration fields, which, through deep coupling of ultrasonic free radical chain recombination and macroscopic stress guidance, achieves controllable repair and performance enhancement of severely aged polymer molecular chains.

Description

Technical Field

[0001] This invention belongs to the field of polymer material recycling technology, specifically relating to a polymer regeneration modification method based on wide-frequency domain hydraulic and ultrasonic dynamic physical field control. Background Technology

[0002] Polymer materials, due to their excellent comprehensive performance and cost advantages, are widely used in packaging, building materials, automobiles, home appliances, and many other fields, becoming an indispensable basic material in modern society. However, these materials generate a large amount of waste at the end of their service life, leading to increasingly serious waste disposal problems. Efficient recycling and reuse are key to achieving resource recycling and reducing environmental pollution. Mechanical recycling (physical recycling) is currently the primary method for treating plastic waste due to its relatively simple process and low cost. However, current polymer mechanical recycling technologies suffer from the bottleneck of irreversible performance degradation. Therefore, recycled plastics currently on the market have poor performance and can only be used in products with lower performance requirements or blended for downgraded use.

[0003] To improve the performance of recycled materials, the industry has conducted extensive research, mainly categorized into two technical routes: chemical modification and physical modification. Chemical modification involves adding compatibilizers, antioxidants, or crosslinking agents to increase the molecular weight and stability of the recycled material. However, this method requires the introduction of exogenous chemicals, increasing cost and complexity, potentially leading to secondary pollution risks, and making the recycled material less "pure," thus hindering its application in high-end fields such as food contact and medical applications, as well as subsequent multiple recycling. Physical modification, on the other hand, alters the material's structure and properties through external physical fields. Its cleanliness has garnered attention, but existing physical modification technologies have systemic limitations: 1. Limitations of Single Physical Field Applications: Currently, ultrasonic-assisted extrusion has been studied for polymer recycling. However, existing technologies typically employ fixed or narrow power ranges, resulting in unstable effects when processing prevalent linear thermoplastic waste plastics. If the power is too low, the modification effect is weak; conversely, blindly using high power (e.g., >1000W) to improve performance can easily lead to excessive random breakage of the polymer backbone, triggering secondary degradation, performance fluctuations, and even deterioration. Furthermore, existing technologies lack power control guidelines for raw materials with different aging stages, resulting in poor process adaptability. On the other hand, the application of low-frequency vibration or pressure pulsation in existing technologies has a relatively singular purpose, primarily focusing on macroscopic rheological improvements, such as promoting mixing, reducing defects, and promoting molecular chain orientation. The frequency selection is often not related to the relaxation behavior of the polymer melt, contributing little to the repair of molecular chain structural damage.

[0004] 2. Lack of systematic multi-field synergy and flexible control strategies: Existing technologies are mostly limited to the research or application of single physical fields or simple equipment superposition. They lack a deep understanding of the synergistic mechanism between fields and the establishment of a complete process parameter system that can be flexibly switched. Therefore, when faced with waste plastics with complex composition and varying degrees of aging, single and fixed physical field treatment modes are inadequate. For example, for lightly aged materials, high-intensity composite fields may be uneconomical, while for severely aged materials, single physical fields cannot achieve deep repair.

[0005] Therefore, there is an urgent need in this field for a physical regeneration method that can intelligently select the external field action mode based on the state of the raw materials and make precise control within an optimized parameter window, in order to solve the problems of rigidity and poor adaptability of existing technical solutions. Summary of the Invention

[0006] The present invention aims to overcome the above-mentioned defects of the prior art and provide a novel polymer regeneration modification method based on adjustable parameter windows and hydraulic and ultrasonic dynamic physical field control.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A polymer regeneration modification method based on broadband hydraulic and ultrasonic dynamic physical field control, characterized by comprising the following steps: S1. Raw material pretreatment: Waste polymer raw materials are sorted, cleaned, dried and crushed to obtain pretreated materials; S2. Melting and plasticizing: The pretreated material is fed into an extrusion device for melting and plasticizing to form a uniform polymer melt; S3. Physical field control: The polymer melt is made to flow through a physical field action area set on the extrusion equipment, and the melt is subjected to dynamic physical field action by an external field generation module for in-situ modification treatment; the dynamic physical field includes at least one of a hydraulic vibration field and an ultrasonic oscillation field; wherein the frequency of the hydraulic vibration field is 2Hz to 200Hz; and the power of the ultrasonic oscillation field is less than 800W. S4. Molding and post-processing: The polymer melt treated by the dynamic physical field is extruded from the molding die, and then cooled, drawn, pelletized or shaped to obtain recycled polymer particles or products.

[0008] As a further preferred embodiment of the above technical solution, the operating frequency of the hydraulic vibration field is 4Hz to 8Hz.

[0009] As a further preferred embodiment of the above technical solution, the power of the ultrasonic oscillation field is 150W to 750W.

[0010] As a further preferred embodiment of the above technical solution, the application mode of the dynamic physical field includes a hydraulically dominated mode, an ultrasonically dominated mode, and a combined synergistic mode. As a further preferred option of the above technical solution, when processing waste polymers that are severely aged, contain cross-linked gel structures, or have many impurities, the aforementioned composite synergistic mode is preferred.

[0011] As a further preferred embodiment of the above technical solution, in the composite synergistic mode, the operating frequency of the hydraulic vibration field is set to 4Hz±1Hz, and the operating power of the ultrasonic oscillation field is 750W±50W.

[0012] As a further preferred embodiment of the above technical solution, the waste polymer is one of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyamide, or a blend thereof.

[0013] As a further preferred embodiment of the above technical solution, the extrusion equipment is a single-screw or twin-screw extruder, and the physical field action area is integrated in the melt flow channel between the screw end and the forming die of the extrusion equipment; the external field generation module includes a hydraulic pulsation generator and an ultrasonic transducer, which couple energy to the melt flow channel through a pressure transmission interface and an ultrasonic vibrating head, respectively.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention integrates an optimized single physical field action mode with an innovative composite mode into a complete and selectable process system. Users can flexibly choose the most economical and effective mode based on the actual conditions of the waste polymer raw materials, such as aging degree and pollution status, realizing intelligent and highly adaptable process strategies and constructing a complete and selectable process system. This invention also makes the application of either physical field more controllable and efficient by defining the effective and safe working parameter windows of the hydraulic vibration field and the ultrasonic oscillation field. This invention creatively proposes a composite synergistic mode of simultaneously applying ultrasonic oscillation field and hydraulic vibration field. This mode generates a synergistic effect of "1+1>2" through deep coupling of microscopic cavitation activation and macroscopic stress guidance, realizing the controllable breakage and orderly recombination of molecular chains and significantly improving the modification efficiency. The entire process of this invention is physical modification, requiring no chemical additives. The required equipment is easy to integrate into existing extrusion production lines, with low modification costs, green environmental protection, and easy industrialization. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1This is a schematic diagram of the steps in the polymer regeneration and modification method provided by the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1 like Figure 1 As shown, this embodiment provides a polymer regeneration modification method based on broadband hydraulic and ultrasonic dynamic physical field control, including the following steps: S1. Raw Material Pretreatment: The collected waste polymer raw materials are sorted manually or automatically, and initially separated according to material type (such as polypropylene PP, polyethylene PE). The waste polymer raw materials can be used packaging, containers, industrial scraps, etc., and their materials are one of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyamide or blends thereof. Then, they are washed to remove surface stains, labels, residual contents, etc., and are thoroughly dried to remove moisture. Then, the clean flakes / blocks are processed into relatively uniform fragments or flocculent materials by crusher or shredder to obtain pretreated materials to ensure the stability of subsequent feeding.

[0018] S2. Melting and Plasticizing: The pretreated material is continuously and stably fed into the extrusion equipment through a feeding device. The extrusion equipment is a single-screw or twin-screw extruder. This equipment is a conventional extrusion equipment in the field, and its specific structure will not be described in detail here. The heating process temperature of each zone of the extrusion equipment from the feeding section to the die head is set according to the material type of the target polymer, so that the material is gradually and completely melted and homogenized under the conveying, compression, shearing and mixing action of the screw, forming a polymer melt with uniform temperature and viscosity.

[0019] S3. Physical field control: The polymer melt formed in step S2 is made to flow through a specially designed physical field action area integrated into the extrusion equipment. This area is preferably located in the high-pressure melt flow channel between the end of the extruder screw and the final forming die. In this area, dynamic physical field action can be applied to the melt through an external field generation module to perform in-situ modification treatment. The dynamic physical field includes one or both of hydraulic vibration field and ultrasonic oscillation field. The hydraulic vibration field is generated by a hydraulic pulsation generator, such as a servo hydraulic system or a reciprocating piston pump. This device applies periodic pressure pulsations to the melt in the flow channel through a pressure transmission interface, such as a flexible diaphragm or a piston, which are coaxial with the flow direction or at a specific angle. The frequency of these pressure pulsations can be continuously or stepwise adjusted within a wide range of 2Hz to 200Hz, preferably between 4Hz and 8Hz. The amplitude can be matched and adjusted according to the extrusion back pressure. The ultrasonic oscillation field consists of an ultrasonic generator, a transducer, and a vibrating head. The ultrasonic transducer converts high-frequency electrical signals into mechanical vibrations, which are coupled into the melt flow channel via the vibrating head. The output power of the ultrasonic oscillation field is strictly controlled to be below 800W, preferably adjustable between 150W and 750W, and its operating frequency is typically in the range of 15kHz to 40kHz.

[0020] In step S3, regarding the application mode of the dynamic physical field, this embodiment provides a flexible control strategy, which can select one of the following three basic modes according to the aging degree, pollution status, gel content, and target product performance requirements of the waste polymer raw materials: 1. Hydraulic-dominated mode: Only the hydraulic vibration field is activated. This mode is suitable for recycled materials with relatively light aging, poor polymer melt flowability, uneven mixing, or processing "historical memory". It can effectively break the melt stagnation zone by using low-frequency pulsating pressure and vibration shear, promote the dispersion and homogenization of each component, and reduce the apparent viscosity of the melt by inducing dynamic shear thinning and wall slip, thereby improving the molecular chain orientation and melt flowability.

[0021] 2. Ultrasonic-dominated mode: Only the ultrasonic oscillation field is turned on. This mode is suitable for recycled materials with a large thermal history, a small number of oxidative cross-linking gel points, or abnormally broadened molecular weight distribution. It can generate controlled high-frequency vibration and cavitation effect in the polymer melt to break the weak bonds and local gel / entanglement network in the aged polymer, generate active macromolecular free radicals, and promote the molecular chain recombination, branching or chain extension of these free radicals, thereby repairing the molecular weight and performance reduced by degradation.

[0022] 3. Composite Synergistic Mode: Simultaneously activating the hydraulic vibration field and the ultrasonic oscillation field is the preferred and most effective mode for treating severely aged, significantly degraded waste plastics containing a large amount of gel or with complex composition. In this mode, the two physical fields produce a deep synergistic effect in terms of energy form, action scale, and time scale. The ultrasonic field is responsible for repairing molecular chains and reducing flow viscosity, while the hydraulic field is responsible for promoting the dispersion and homogenization of various components and the orientation of molecular chains, etc.

[0023] S4. Molding and Post-processing: The polymer melt, whose structure has been optimized through physical field control, is then conveyed to the molding die and extruded. The extruded melt strip or profile immediately enters a cooling medium such as a water tank, cooling roller, or forced air cooling for rapid cooling and shaping to "freeze" its optimized microstructure. Finally, it is pulled out at a uniform speed by a traction device and granulated by a pelletizer as needed to obtain high-performance recycled polymer particles, or directly wound and cut to obtain intermediate products such as sheets and profiles.

[0024] It should be further explained that the mechanism of the ultrasonic oscillation field in this embodiment lies in microscale activation and fracture-reorganization: under controlled power of less than 800W, the ultrasonic waves mainly generate high-frequency mechanical vibration and controlled cavitation effect in the viscoelastic melt. The high temperature, high pressure or strong shock wave generated at the moment of cavitation bubble collapse can accurately target the "defect" structure in the polymer system, such as tertiary carbon free radical sites generated by β-fracture, peroxy bonds generated by oxidation, weak bonds such as carbonyl α-position, excessive physical entanglement network formed by multiple shearing, and mild chemical crosslinking points. This selective fracture eliminates structural defects that lead to stress concentration and performance degradation, while the large number of active macromolecular free radicals generated by fracture will undergo molecular chain recombination, branching or chain extension, thereby repairing the molecular weight and performance reduced by degradation.

[0025] The mechanism of the hydraulic vibration field in this embodiment lies in macroscopic rheological regulation and stress guidance: by using periodic hydraulic pulsating pressure and shear force in the frequency range of 2 to 200 Hz, the alternating pressure field and steady-state shear flow field are superimposed to form high-intensity dynamic shear, which greatly stimulates the "shear thinning" effect of the melt and promotes wall slip, thereby significantly reducing the apparent viscosity of the process and improving the mixing and temperature field uniformity. The composite synergistic mode in this embodiment produces a profound synergy of "1+1>2". The ultrasonic oscillation field precisely creates active sites and triggers recombination reactions at the microscopic level, while the periodic tensile and shear stresses generated by the hydraulic vibration field provide a directional and periodic driving field for the active free radicals and chain segments generated by ultrasonic activation. Under the guidance of this stress field, molecular chains are more likely to move, align and approach along the flow field direction, greatly increasing the probability of them undergoing orderly and effective recombination, rather than random combinations that may lead to performance dispersion. Moreover, the macroscopic hydraulic stress field can effectively suppress the tendency of random excessive degradation that may be caused by high-power ultrasound alone, guiding the chain-severed products to recombine towards an ordered, dense, and high-performance structure. This spatiotemporal coupling of microscopic activation and macroscopic guidance makes the contradictory processes of fracture and recombination efficient and controllable, ultimately achieving molecular weight recovery, narrowing of molecular weight distribution, and optimization of topological structures such as long branches, thus manifesting as a simultaneous and significant improvement in strength and toughness on a macroscopic level.

[0026] To evaluate the technical effectiveness of the parameters disclosed in this invention, the following comparative examples are used for verification.

[0027] 1. Raw materials: Select virgin HDPE material of grade 5000s with an original relative molecular mass of approximately 130,000. Process it three times in a twin-screw extruder, applying multiple thermomechanical actions to degrade some molecular chains, causing the material to turn slightly yellow. Clean the HDPE waste material to remove impurities and adhering substances, and vacuum dry it at 80°C for 4 hours to remove moisture.

[0028] 2. Process: A laboratory single-screw extruder (screw diameter ø50mm, length-to-diameter ratio L / D=28) is used. The extruder barrel has three temperature control sections: the feeding section temperature is set at 160℃, the intermediate melting section at 180℃, and the die head flange section at 200℃. The screw speed is set at 5rpm to ensure appropriate shearing and uniform plasticization of the melt. At the die head outlet of the extruder, hydraulic shearing or ultrasonic vibration is applied to the polymer melt. Pressure and temperature are monitored in real time by a probe installed at the die head outlet.

[0029] 3. Extrusion and Compound Processing: Dry HDPE scrap is continuously fed into the extruder, with a forced feeding device at the feed port to ensure stable feeding. Once the extruder reaches steady-state melting (melt temperature at the die head is approximately 200°C), the ultrasonic generator is activated, and different ultrasonic power levels are set, with a peak amplitude of approximately 2μm. This causes the ultrasonic vibrating head to apply high-frequency vibration to the melt inside the die head. Simultaneously, the hydraulic system is activated, and the hydraulic shear vibration frequency is adjusted. At this point, the HDPE melt is extruded through the die head under the combined action of ultrasonic cavitation and high pressure. The extruded material is extruded from the die head in sheet form, and after air cooling, it is pulled out by a traction machine to obtain HDPE recycled sheet material.

[0030] 4. Comparative test: On the one hand, under the same extrusion conditions, without turning on the ultrasonic and hydraulic fields, the same aged material was subjected to conventional melt granulation to obtain unmodified HDPE recycled material; on the other hand, the same aged material was subjected to recycling experiments in a separate hydraulic vibration field, a separate ultrasonic oscillation field, and a combined ultrasonic and hydraulic field.

[0031] 5. Performance Testing: The experimental samples were subjected to various tests, including mechanical properties. Tensile strength and elongation at break were tested using an electronic tensile testing machine (in accordance with GB / T1040 standard). In addition, the crystallinity of the material was characterized by differential scanning calorimetry, and the molecular weight of the material was characterized by gel permeation chromatography.

[0032] The following naming rules for experiments are: V represents new material, the number after A represents the number of aging cycles, the number after H represents the hydraulic frequency, and the number after U represents the ultrasonic power.

[0033] Comparative Example 1: The experimental samples included virgin HDPE samples (v-HDPE), general recycled HDPE samples without any physical field treatment (A3H0U0), and recycled HDPE samples subjected to hydraulic vibration fields at different frequencies (2Hz, 4Hz, 6Hz, 8Hz). The experimental results are shown in Table 1. Table 1 Comparison of HDPE material properties before and after treatment in Comparative Example 1 Sample number Tensile strength (MPa) Elongation at break (%) v-HDPE 24.8 910.5 A3H0U0 22.5 639.6 A3H2U0 31.0 1063.9 A3H4U0 42.5 1010.1 A3H6U0 39.4 1023.3 A3H8U0 40.8 1137.0 As can be seen from the above, the mechanical properties of recycled material are reduced by nearly 2 MPa compared with those of virgin material, and the elongation at break is significantly lower than that of virgin material. Data from hydraulic vibration fields with different operating frequencies show that the modification effect is best at a frequency of 4 Hz, and the tensile strength can be increased by 20 MPa.

[0034] Comparative Example 2: Experimental samples included virgin HDPE samples (v-HDPE), general recycled HDPE samples without any physical field treatment (A3H0U0), and recycled HDPE samples subjected to ultrasonic oscillation fields with different power levels (150W, 350W, 550W, 650W, 750W, 800W). Experimental results are shown in Table 2. Table 2 Comparison of HDPE material properties before and after treatment in Comparative Example 2 sample Tensile strength (MPa) Elongation at break (%) v-HDPE 24.8 910.5 A3H0U0 22.5 639.6 A3H0U150 38.9 633.2 A3H0U350 35.1 642.1 A3H0U550 33.8 778 A3H0U650 34.1 855 A3H0U750 38 1019 A3H0U800 23.4 781.4 As shown above, the tensile strength and elongation at break of the recycled material are significantly improved under ultrasonic oscillation fields with different power levels. However, when the ultrasonic oscillation power is increased to 800W (A3H0U800), the material properties decline, manifested as a decrease in tensile strength and elongation at break. This indicates that excessively high ultrasonic energy may induce excessive cavitation or excessive chain segment breakage, and the increased local temperature caused by excessively high ultrasonic power is more likely to lead to secondary degradation. Therefore, the ultrasonic power should be controlled below 800W.

[0035] Comparative Example 3: Experimental samples included virgin HDPE samples (v-HDPE), general recycled HDPE samples without any physical field treatment (A3H0U0), and recycled HDPE samples subjected to hydraulic vibration fields with different frequencies (2Hz, 4Hz, 8Hz) and ultrasonic vibration fields with different powers (150W, 350W, 550W, 650W, 750W). Experimental results are shown in Table 3. Table 3 Comparison of HDPE material properties before and after treatment in Comparative Example 3 sample Tensile strength (MPa) Elongation at break (%) v-HDPE 24.8 910.5 A3H0U0 22.5 639.6 A3H2U150 28.5 964.5 A3H4U150 28.8 1042.2 A3H8U150 32.1 934.4 A3H2U350 26.3 882.6 A3H4U350 37.9 1072.4 A3H8U350 30.2 1072.4 A3H2U550 30.8 964.3 A3H4U550 38.7 1039.7 A3H8U550 36 948 A3H2U650 34.9 1061.7 A3H4U650 35.7 918.9 A3H8U650 35.5 871.2 A3H2U750 39 1082.5 A3H4U750 45.4 1130.7 A3H8U750 40.1 1088.1 As can be seen from the above, under the action of a hydraulic vibration field with a constant frequency and an ultrasonic power of less than 800W, the performance of the recycled material basically conforms to the rule that the higher the ultrasonic strength, the better the performance; however, under the action of an ultrasonic oscillation field with a constant power, the optimal hydraulic frequency is generally 4HZ; the parameters with the best recycling performance when the two fields are superimposed are 4HZ and 750W, and the tensile properties and elongation at break are almost doubled compared to the aged material.

[0036] As can be seen from the above comparative examples, under the synergistic effect of the ultrasonic and hydraulic composite external field described in this invention, the comprehensive performance of HDPE recycled material is significantly improved. Compared with the untreated aged material A3H0U0, the tensile strength and elongation at break of the A3H4U750 sample treated with hydraulic vibration and ultrasound are significantly improved, and the overall level exceeds that of the virgin material. This indicates that the strength and toughness of the material are simultaneously restored and enhanced, demonstrating that this process can effectively promote the recombination and performance reconstruction of the degraded polymer chains. Therefore, in the composite synergistic mode of this invention, the operating frequency of the hydraulic vibration field should preferably be set to 4Hz, and the operating power of the ultrasonic oscillation field should preferably be set to 750W. Finally, it should be noted that the above description is only a preferred embodiment of this invention and is not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A polymer regeneration modification method based on broadband hydraulic and ultrasonic dynamic physical field control, characterized in that, Includes the following steps: S1. Raw material pretreatment: Waste polymer raw materials are sorted, cleaned, dried and crushed to obtain pretreated materials; S2. Melting and plasticizing: The pretreated material is fed into an extrusion device for melting and plasticizing to form a uniform polymer melt; S3, Physical field control: The polymer melt is made to flow through a physical field action area set on the extrusion equipment, and the melt is subjected to dynamic physical field action through the external field generation module to perform in-situ modification treatment; The dynamic physical field includes at least one of a hydraulic vibration field and an ultrasonic oscillation field; wherein the frequency of the hydraulic vibration field is between 2Hz and 200Hz; and the power of the ultrasonic oscillation field is less than 800W. S4. Molding and post-processing: The polymer melt treated by the dynamic physical field is extruded from the molding die, and then cooled, drawn, pelletized or shaped to obtain recycled polymer particles or products.

2. The polymer regeneration modification method according to claim 1, characterized in that, The frequency of the hydraulic vibration field is from 4 Hz to 8 Hz.

3. The polymer regeneration modification method according to claim 1, characterized in that, The power of the ultrasonic oscillation field is 150W to 750W.

4. The polymer regeneration modification method according to claim 1, characterized in that, The application modes of the dynamic physical field include hydraulic-dominated mode, ultrasonic-dominated mode, and composite synergistic mode.

5. The polymer regeneration modification method according to claim 4, characterized in that, When dealing with waste polymers that are severely aged, contain cross-linked gel structures, or have many impurities, the aforementioned composite synergistic mode should be preferred.

6. The polymer regeneration modification method according to claim 4, characterized in that, In the composite synergistic mode, the operating frequency of the hydraulic vibration field is set to 4Hz±1Hz, and the operating power of the ultrasonic oscillation field is 750W±50W.

7. The polymer regeneration modification method according to claim 1, characterized in that, The waste polymer is one of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyamide, or a blend thereof.

8. The polymer regeneration modification method according to claim 1, characterized in that, The extrusion equipment is a single-screw or twin-screw extruder, and the physical field action area is integrated in the melt flow channel between the screw end and the forming die of the extrusion equipment; the external field generation module includes a hydraulic pulsation generator and an ultrasonic transducer, which couple energy to the melt flow channel through a pressure transmission interface and an ultrasonic vibrating head, respectively.

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