A high puncture-resistant polyethylene geomembrane and its production apparatus and process

Abstract

This application discloses a high puncture-resistant polyethylene geomembrane and its production apparatus and process, belonging to the field of geomembrane technology. The high puncture-resistant polyethylene geomembrane comprises, from top to bottom, an upper membrane, a first middle membrane, an inner membrane, a second middle membrane, and a lower membrane. By weight, the upper and lower membranes each comprise 90-100 parts of modified linear low-density polyethylene resin and 2-10 parts of dual-resistant black masterbatch; the first and second middle membranes each comprise 40-60 parts of medium-density polyethylene resin, 35-55 parts of metallocene high-density polyethylene resin, and 2-10 parts of dual-resistant black masterbatch; the inner membrane comprises 60-80 parts of medium-density polyethylene resin, 15-35 parts of linear low-density polyethylene resin, and 2-10 parts of dual-resistant black masterbatch. This application describes a polyethylene geomembrane with a symmetrical five-layer structure centered on the inner membrane. It specifically defines the components of each layer and the proportional relationship between the components, thereby simultaneously improving the puncture resistance and environmental stress cracking resistance of the polyethylene geomembrane to meet the needs of seepage prevention projects in harsh environments.

Description

Technical Field

[0001] This application relates to a high puncture-resistant polyethylene geomembrane and its production apparatus and process, belonging to the field of geomembrane technology. Background Technology

[0002] Currently, polyethylene geomembranes are mainly used as the primary seepage barrier layer in sanitary landfills and tailings ponds. However, in some seepage control projects, the foundation conditions are not ideal, with many sharp-angled stones in the compacted soil layer, posing a significant risk of leaks during geomembrane installation. Complex environmental conditions also present a significant challenge to the geomembrane's resistance to environmental stress cracking. Furthermore, after the protective layer is laid, a leachate-diverting layer is typically laid on top of the geomembrane. This layer may contain sharp-angled stones, and despite the geomembrane as a protective layer, the safety factor of the geomembrane's integrity is greatly reduced under the heavy pressure of a large landfill. On the other hand, for landfill seepage control, the backfill waste inevitably contains sharp objects after the landfill is operational, placing higher demands on the geomembrane's puncture resistance under the heavy pressure of a large landfill.

[0003] Existing composite geomembranes typically use high-density polyethylene or linear low-density polyethylene as raw materials. After screening, washing, and drying, these materials are fed into an extruder to produce the geomembrane. However, geomembranes produced using existing technologies often fail to simultaneously achieve both puncture resistance and environmental stress cracking resistance, making them unsuitable for seepage control projects in harsh environments. Therefore, providing a polyethylene geomembrane that meets the requirements for both puncture resistance and environmental stress cracking resistance in seepage control projects in harsh environments is a pressing issue that needs to be addressed. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a high-puncture-resistant polyethylene geomembrane and its production apparatus and process. This application constructs a polyethylene geomembrane with a symmetrical five-layer structure centered on the inner layer membrane by sequentially arranging an upper membrane, a first middle membrane, an inner membrane, a second middle membrane, and a lower membrane from top to bottom. The composition of each layer and the proportional relationships between the components are specifically defined, simultaneously improving the puncture resistance and environmental stress cracking resistance of the polyethylene geomembrane to meet the needs of seepage prevention projects in harsh environments.

[0005] According to one aspect of this application, a high puncture-resistant polyethylene geomembrane is provided, comprising, from top to bottom, an upper membrane, a first middle membrane, an inner membrane, a second middle membrane, and a lower membrane; by weight, the upper membrane and the lower membrane each comprise 90-100 parts of modified linear low-density polyethylene resin and 2-10 parts of dual-resistant black masterbatch; the first middle membrane and the second middle membrane each comprise 40-60 parts of medium-density polyethylene resin, 35-55 parts of metallocene high-density polyethylene resin, and 2-10 parts of dual-resistant black masterbatch; the inner membrane comprises 60-80 parts of medium-density polyethylene resin, 15-35 parts of linear low-density polyethylene resin, and 2-10 parts of dual-resistant black masterbatch.

[0006] Preferably, by weight, the upper and lower membranes each comprise 95 parts of modified linear low-density polyethylene resin and 5 parts of dual-resistance black masterbatch; the first and second middle membranes each comprise 50 parts of medium-density polyethylene resin, 45 parts of metallocene high-density polyethylene resin and 5 parts of dual-resistance black masterbatch; and the inner membrane comprises 70 parts of medium-density polyethylene resin, 25 parts of linear low-density polyethylene resin and 5 parts of dual-resistance black masterbatch.

[0007] Specifically, this application comprises, from top to bottom, an upper membrane, a first middle membrane, an inner membrane, a second middle membrane, and a lower membrane, forming a symmetrical membrane structure centered on the inner membrane. In the upper and lower membranes, the modified linear low-density polyethylene resin, after toughening and reinforcement modification, works in conjunction with the dual-resistance black masterbatch to give the upper and lower membranes high stiffness, high tensile strength, and high puncture resistance, as well as excellent flexibility and resistance to environmental stress cracking. The first and second middle membranes are made of medium-density polyethylene resin, metallocene high-density polyethylene resin, and dual-resistance black masterbatch. The metallocene high-density polyethylene has high rigidity and high tensile modulus, and is puncture-resistant. While possessing excellent puncture resistance, its resistance to environmental stress cracking is relatively poor. However, by combining it with a specific ratio of medium-density polyethylene resin and dual-resistance black masterbatch, it achieves excellent environmental stress cracking resistance and tear resistance while maintaining excellent puncture resistance. The inner membrane utilizes medium-density polyethylene resin, linear low-density polyethylene resin, and dual-resistance black masterbatch to improve the geomembrane's flexibility while also meeting its rigidity requirements. This application employs a symmetrical five-layer membrane structure, enabling the geomembrane to possess excellent environmental stress cracking resistance and tear resistance in addition to its excellent puncture resistance, thus adapting to harsh environmental seepage control projects.

[0008] Optionally, by weight, the modified linear low-density polyethylene resin comprises 80-100 parts of linear low-density polyethylene resin, 5-15 parts of modified nano-silica, 5-10 parts of nano-titanium dioxide, 2-8 parts of maleic anhydride-grafted polyethylene, 0.5-1.5 parts of antioxidant, and 0.05-0.1 parts of ultraviolet absorber; the modified nano-silica is prepared by modification with a silane coupling agent.

[0009] Specifically, the preparation method of modified linear low-density polyethylene resin includes the following steps:

[0010] S01 involves mixing modified nano-silica, nano-titanium dioxide, maleic anhydride-grafted polyethylene, antioxidant, and ultraviolet absorber in a specific ratio to obtain a premix.

[0011] S02 involves adding the premix to linear low-density polyethylene resin and then performing co-extrusion using a twin-screw extruder at a temperature of 180–220°C.

[0012] SO3 is cooled and granulated to obtain modified linear low-density polyethylene resin.

[0013] Specifically, this application uses modified linear low-density polyethylene to obtain modified linear low-density polyethylene resin, which improves both strength and toughness. This resin works in conjunction with the dual-resistance black masterbatch to ensure the geomembrane's puncture resistance, oxidation resistance, and environmental stress cracking resistance. On one hand, a specific ratio of modified nano-silica, nano-titanium dioxide, and maleic anhydride-grafted polyethylene synergistically enhances its mechanical properties and toughness. On the other hand, the modified nano-silica effectively improves the dispersibility and compatibility of the nano-silica, further enhancing the modification effect.

[0014] Optionally, the method for preparing the modified nano-silica includes the following steps:

[0015] (1) Disperse nano-silica in ethanol to obtain nano-silica dispersion;

[0016] (2) Add silane coupling agent to the nano silica dispersion, and heat and stir;

[0017] (3) Centrifuge and vacuum dry to obtain modified nano-silica.

[0018] Specifically, the mass ratio of nano-silica to ethanol is 1:(300-400), and the volume fraction of the silane coupling agent is 1.5% to 2%.

[0019] Specifically, in step (1), the dispersion time is 25-35 min; in step (2), the temperature is 60-75℃ and the stirring time is 3-4 h; in step (3), the centrifugation speed is 7500-8500 rpm and the vacuum drying is 45-55℃ for 24-36 h.

[0020] Specifically, the silane coupling agent is an aminosilane coupling agent.

[0021] Specifically, the aminosilane coupling agent is 3-aminopropyltriethoxysilane or N-(2-aminoethyl)-3-aminopropyltrimethoxysilane.

[0022] Preferably, the aminosilane coupling agent is 3-aminopropyltriethoxysilane.

[0023] Specifically, aminosilane coupling agents can introduce amino groups onto nano-silica, which helps improve the dispersibility of nano-silica, prevents its aggregation, and further enhances the modification effect.

[0024] According to another aspect of this application, a production apparatus for the aforementioned high puncture-resistant polyethylene geomembrane is also provided, comprising, in sequence, a centralized feeding mechanism, a melt extrusion mechanism, a die forming mechanism, an internal cooling control mechanism, and a traction and rolling mechanism; the centralized feeding mechanism includes a first feeding component, a second feeding component, a third feeding component, a fourth feeding component, and a fifth feeding component.

[0025] Specifically, the production apparatus for high puncture-resistant polyethylene geomembrane provided in this application sequentially passes through a centralized feeding mechanism, a melt extrusion mechanism, a mold forming mechanism, an internal cooling control mechanism, and a traction rolling mechanism to obtain a high puncture-resistant polyethylene geomembrane through five-layer co-extrusion blow molding.

[0026] Optionally, the first feeding component includes a first hopper, a first quantitative feeder, and a first hopper; the second feeding component includes a second hopper, a second quantitative feeder, and a second hopper; the third feeding component includes a third hopper, a third quantitative feeder, and a third hopper; the fourth feeding component includes a fourth hopper, a fourth quantitative feeder, and a fourth hopper; and the fifth feeding component includes a fifth hopper, a fifth quantitative feeder, and a fifth hopper, wherein the first hopper, the second hopper, the third hopper, the fourth hopper, and the fifth hopper are respectively located below the first quantitative feeder, the second quantitative feeder, the third quantitative feeder, the fourth quantitative feeder, and the fifth quantitative feeder.

[0027] Specifically, the first silo is used to store modified linear low-density polyethylene resin, the second silo is used to store metallocene high-density polyethylene resin, the third silo is used to store medium-density polyethylene resin, the fourth silo is used to store linear low-density polyethylene resin, and the fifth silo is used to store double-resistant black masterbatch.

[0028] Specifically, the first, second, third, fourth, and fifth quantitative feeders extract raw materials from their respective silos according to the formula ratio and mix them thoroughly. After mixing, the raw materials are fed into the corresponding first, second, third, fourth, and fifth hoppers.

[0029] Optionally, the melt extrusion mechanism includes a first screw melt extruder, a second screw melt extruder, a third screw melt extruder, a fourth screw melt extruder, and a fifth screw melt extruder, wherein the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder are respectively disposed below the first hopper, the second hopper, the third hopper, the fourth hopper, and the fifth hopper.

[0030] Specifically, the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder heat and melt the mixed raw materials fed into the first hopper, the second hopper, the third hopper, the fourth hopper, and the fifth hopper, respectively, and then extrude them to the die forming mechanism.

[0031] Optionally, the mold forming mechanism includes a connecting pipe assembly, a fluid distributor, a five-layer forming mold, and a herringbone frame; the connecting pipe assembly includes a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, and a fifth connecting pipe; the first connecting pipe, the second connecting pipe, the third connecting pipe, the fourth connecting pipe, and the fifth connecting pipe are respectively connected to a first screw melt extruder, a second screw melt extruder, a third screw melt extruder, a fourth screw melt extruder, and a fifth screw melt extruder and the fluid distributor, and the fluid distributor is connected to the five-layer forming mold.

[0032] Specifically, a flowing melt is formed in the five-layer molding die and then extruded through the five-layer molding die.

[0033] Specifically, the A-frame is equipped with guide tubes.

[0034] Optionally, the internal cooling control mechanism includes an air inlet fan, an air outlet fan, a width probe, an air inlet pipe, and an air outlet pipe; the air inlet pipe connects the air inlet fan to the five-layer forming mold, and the air outlet pipe connects the air outlet fan to the five-layer forming mold; the traction and winding mechanism sequentially includes a first traction machine, a slitting assembly, an upper guide roller, a film spreading frame, a lower guide roller, a second traction machine, a film storage frame, a third traction machine, and a friction winding machine; the slitting assembly includes a slitting blade and a slitting blade support; the five-layer forming mold includes a mold body, an air inlet, and an air outlet; the mold body has flow channels inside, including a first flow channel, a second flow channel, a third flow channel, a fourth flow channel, and a fifth flow channel, which are respectively connected to a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, and a fifth connecting pipe.

[0035] Specifically, the five-layer forming mold gathers the raw materials transported by the split fluid and extrudes geomembrane bubbles from above the mold. The A-frame then steadily transports the extruded and cooled geomembrane bubbles upward to the first traction machine.

[0036] Specifically, a five-layer membrane structure is formed through a five-layer molding mold, consisting of an upper membrane, a first middle membrane, an inner membrane, a second middle membrane, and a lower membrane.

[0037] Specifically, the width probe is used to control the width of the geomembrane bubble.

[0038] According to another aspect of this application, a production process for the aforementioned high puncture-resistant polyethylene geomembrane is also provided, comprising the following steps:

[0039] S1 First quantitative feeder, Second quantitative feeder, Third quantitative feeder, Fourth quantitative feeder, and Fifth quantitative feeder extract raw materials from the First, Second, Third, Fourth, and Fifth hoppers according to a ratio and mix them thoroughly. The raw materials then enter the First, Second, Third, Fourth, and Fifth Screw Melt Extruders respectively through the First, Second, Third, Fourth, and Fifth Hoppers.

[0040] The first, second, third, fourth, and fifth screw melt extruders of S2 extrude molten raw materials, which are then fed into the distributor via the first, second, third, fourth, and fifth connecting pipes, respectively. The materials are then transported to the five-layer forming die to form a flowing melt. The flowing melt is extruded through the five-layer forming die to obtain a cylindrical film bubble.

[0041] S3 lifts the cylindrical membrane bubble to the first traction machine, and the cylindrical membrane bubble forms a closed cylindrical cavity between the five-layer forming mold and the first traction machine; the inlet fan injects air into the cylindrical cavity, and the outlet fan discharges the air from the cylindrical cavity. The inlet fan and outlet fan are controlled according to a transverse stretching ratio of 1:(1.2~1.4) to form a cylindrical cavity with a stable diameter.

[0042] The first traction machine (S4) controls the traction speed according to a longitudinal stretch ratio of 1:(1.2~1.4) to form a cylindrical cavity with a stable thickness. The cylindrical cavity is cut by the cutting assembly and unfolded by the membrane unfolding frame to form a geomembrane with a stable width and stable thickness. After being pulled by the second traction machine, the membrane storage frame, and the third traction machine, it is cut into rolls by the friction roll forming machine to obtain a high puncture-resistant polyethylene geomembrane.

[0043] Optionally, in S2, the length-to-diameter ratio of the first, second, third, fourth, and fifth screw melt extruders is 35:1, the feed section temperature is 175–185℃, the compression section temperature is 195–205℃, and the metering section temperature is 185–195℃; the diameter of the first screw melt extruder is D1 = 120mm, the diameter of the second screw melt extruder is D2 = 150mm, the diameter of the third screw melt extruder is D3 = 180mm, the diameter of the fourth screw melt extruder is D4 = 150mm, and the diameter of the fifth screw melt extruder is D5 = 120mm.

[0044] Specifically, in S2, the extrusion ratios of the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder are 10%, 20%, 40%, 20%, and 10%, respectively.

[0045] Specifically, in S2, the extrusion ratios of the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder are 15%, 15%, 40%, 15%, and 15%, respectively.

[0046] Specifically, in S2, the extrusion ratios of the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder are 20%, 10%, 40%, 10%, and 20%, respectively.

[0047] Specifically, in S2, the extrusion ratios of the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder are 10%, 10%, 60%, 10%, and 10%, respectively.

[0048] Specifically, the extrusion ratio of the third screw melt extruder is greater than that of the first, second, fourth, and fifth screw melt extruders.

[0049] Specifically, this application sets specific limits on temperature. Excessive temperature will accelerate the decomposition of the double-resistant black masterbatch, reduce the antioxidant properties of the geomembrane, and significantly shorten the service life of the geomembrane.

[0050] Specifically, this application specifies the steps and process parameters of the production process for high puncture-resistant polyethylene geomembrane, so that the obtained polyethylene geomembrane has excellent resistance to environmental stress cracking and tearing on the basis of excellent puncture resistance, and can adapt to seepage prevention projects in harsh environments. It solves the problem of puncture damage to geomembrane caused by many sharp-angled gravel in compacted soil layers, sharp-angled gravel in gravel drainage layers, and sharp objects in backfill garbage in seepage prevention projects, and greatly improves the safety factor of geomembrane integrity.

[0051] The beneficial effects of this application include, but are not limited to:

[0052] 1. According to the present application, a high puncture-resistant polyethylene geomembrane is formed by sequentially setting an upper membrane, a first middle membrane, an inner membrane, a second middle membrane, and a lower membrane from top to bottom, forming a symmetrical five-layer membrane structure with the inner membrane as the center. The composition of each layer and the proportional relationship between the components are specifically defined, thereby simultaneously improving the puncture resistance and environmental stress cracking resistance of the polyethylene geomembrane to meet the needs of seepage prevention projects in harsh environments.

[0053] 2. According to this application, a high puncture-resistant polyethylene geomembrane comprises an upper and a lower membrane. Modified linear low-density polyethylene resin, after toughening and reinforcement, works in conjunction with a dual-resistance black masterbatch to give the upper and lower membranes high stiffness, high tensile strength, and high puncture resistance, as well as excellent flexibility and resistance to environmental stress cracking. The first and second intermediate membranes are made of medium-density polyethylene resin, metallocene high-density polyethylene, and dual-resistance black masterbatch. Metallocene high-density polyethylene has high rigidity and high tensile modulus, and excellent puncture resistance, but its resistance to environmental stress cracking is limited. The geomembrane exhibits relatively poor puncture resistance, but when combined with a specific ratio of medium-density polyethylene resin and dual-resistance black masterbatch, it achieves excellent environmental stress cracking resistance and tear resistance while maintaining superior puncture resistance. The inner membrane, made of medium-density polyethylene resin, linear low-density polyethylene resin, and dual-resistance black masterbatch, enhances the geomembrane's flexibility while also meeting its rigidity requirements. This application employs a symmetrical five-layer membrane structure, which, in addition to its excellent puncture resistance, also provides the geomembrane with good environmental stress cracking resistance and tear resistance, enabling it to adapt to harsh environmental seepage control projects.

[0054] 3. According to the present application, a high puncture-resistant polyethylene geomembrane is obtained by modifying linear low-density polyethylene to obtain modified linear low-density polyethylene resin, which improves both strength and toughness. This resin works in conjunction with dual-resistance black masterbatch to ensure the geomembrane's puncture resistance, oxidation resistance, and environmental stress cracking resistance. On one hand, a specific ratio of modified nano-silica, nano-titanium dioxide, and maleic anhydride-grafted polyethylene works synergistically to improve its mechanical properties and toughness. On the other hand, the modified nano-silica effectively enhances the dispersibility and compatibility of the nano-silica, further strengthening the modification effect.

[0055] 4. The production apparatus for a high puncture-resistant polyethylene geomembrane according to this application adopts a five-layer co-extrusion blow molding process. The apparatus is reasonably designed and can be adapted to the composition and structure of the high puncture-resistant polyethylene geomembrane, which is conducive to improving production efficiency.

[0056] 5. According to the production process of a high puncture-resistant polyethylene geomembrane of this application, the steps and process parameters of the production process of the high puncture-resistant polyethylene geomembrane are specifically defined, so that the obtained polyethylene geomembrane has good environmental stress cracking resistance and tear resistance on the basis of excellent puncture resistance, and can adapt to seepage prevention projects in harsh environments. It solves the problem of puncture damage to geomembrane caused by many sharp-angled gravel in the compacted soil layer, sharp-angled gravel in the gravel drainage layer, and sharp objects in the backfill garbage in seepage prevention projects, and greatly improves the safety factor of geomembrane integrity. Attached Figure Description

[0057] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0058] Figure 1 This is a cross-sectional structural schematic diagram of the production apparatus for high puncture-resistant polyethylene geomembrane according to an embodiment of this application.

[0059] Figure 2 This is a schematic cross-sectional view of the five-layer molding die involved in the embodiments of this application.

[0060] Figure 3 This is a schematic diagram of the cross-sectional structure of the high puncture-resistant polyethylene geomembrane involved in the embodiments of this application.

[0061] List of components and reference numerals:

[0062] 1. First screw melt extruder; 2. First metering feeder; 3. First hopper; 4. Second screw melt extruder; 5. Second metering feeder; 6. Second hopper; 7. Third screw melt extruder; 8. Third metering feeder; 9. Third hopper; 10. Fourth screw melt extruder; 11. Fourth metering feeder; 12. Fourth hopper; 13. Fifth screw melt extruder; 14. Fifth metering feeder; 15. Fifth hopper; 16. Flow divider; 17. Five-layer forming die; 18. Film bubble; 19. A-frame; 20. Guide tube; 21. First traction machine; 22. Slitting cutter support; 23. Slitting cutter; 24. Upper guide roller; 25. Film spreading frame; 26. Lower guide roller; 27. 28. Second traction machine; 29. ​​Film storage rack; 30. Third traction machine; 31. Friction winding machine; 32. Fifth hopper; 33. Fourth hopper; 34. Third hopper; 35. Second hopper; 36. First connecting pipe; 37. Second connecting pipe; 38. Third connecting pipe; 39. Fourth connecting pipe; 40. Fifth connecting pipe; 41. First flow channel; 42. Second flow channel; 43. Third flow channel; 44. Fourth flow channel; 45. Fifth flow channel; 46. Flowing melt; 47. Air inlet; 48. Width probe; 49. Air outlet; 50. Air inlet fan; 51. Air outlet fan; 52. Upper film; 53. First middle film; 54. Inner film; 55. Second middle film; 56. Lower film. Detailed Implementation

[0063] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0064] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application were all purchased commercially.

[0065] Unless otherwise specified, the methods used in the embodiments and comparative examples of this application are conventional methods in the prior art.

[0066] Example 1

[0067] Preparation method of modified linear low-density polyethylene resin:

[0068] S01 Mix 5 parts of modified nano-silica, 5 parts of nano-titanium dioxide, 2 parts of maleic anhydride-grafted polyethylene, 0.5 parts of antioxidant, and 0.05 parts of ultraviolet absorber evenly to obtain a premix.

[0069] S02 The premixed material is added to 80 parts of linear low-density polyethylene resin and co-extruded using a twin-screw extruder at a temperature of 180℃.

[0070] SO3 is cooled and granulated to obtain modified linear low-density polyethylene resin.

[0071] Preparation method of high puncture-resistant polyethylene geomembrane:

[0072] The S1 first quantitative feeder extracts 90 parts of modified linear low-density polyethylene resin and 2 parts of double-anti-corrosion black masterbatch from the first and fifth hoppers respectively, mixes them thoroughly, and feeds them into the first screw melt extruder through the first hopper. The first screw melt extruder has a length-to-diameter ratio of 35:1 and a diameter D = 120 mm. The temperature of the feeding section of the first screw melt extruder is 175℃, the temperature of the compression section is 195℃, and the temperature of the metering section is 185℃.

[0073] The second quantitative feeder extracts 40 parts of medium-density polyethylene resin, 35 parts of metallocene high-density polyethylene resin, and 2 parts of double-antioxidant black masterbatch from the third, second, and fifth hoppers, respectively, mixes them thoroughly, and feeds them into the second screw melt extruder through the second hopper. The length-to-diameter ratio of the second screw melt extruder is 35:1, the diameter D = 150 mm, the feed section temperature of the second screw melt extruder is 175℃, the compression section temperature is 195℃, and the metering section temperature is 185℃.

[0074] The third quantitative feeder extracts 60 parts of medium-density polyethylene resin, 15 parts of linear low-density polyethylene resin, and 2 parts of double-anti-corrosion black masterbatch from the third, fourth, and fifth hoppers, respectively, mixes them thoroughly, and feeds them into the third screw melt extruder through the third hopper. The length-to-diameter ratio of the third screw melt extruder is 35:1, the diameter D = 180 mm, the feed section temperature of the third screw melt extruder is 175℃, the compression section temperature is 195℃, and the metering section temperature is 185℃.

[0075] The fourth quantitative feeder extracts 40 parts of medium-density polyethylene resin, 35 parts of metallocene high-density polyethylene resin, and 2 parts of double-antioxidant black masterbatch from the third, second, and fifth hoppers, respectively, mixes them thoroughly, and feeds them into the fourth screw melt extruder through the fourth hopper. The fourth screw melt extruder has a length-to-diameter ratio of 35:1 and a diameter D = 150 mm. The feed section temperature of the fourth screw melt extruder is 175℃, the compression section temperature is 195℃, and the metering section temperature is 185℃.

[0076] The fifth quantitative feeder extracts 90 parts of modified linear low-density polyethylene resin and 2 parts of double-anti-corrosion black masterbatch from the first and fifth hoppers respectively, mixes them thoroughly, and feeds them into the fifth screw melt extruder through the fifth hopper. The length-to-diameter ratio of the fifth screw melt extruder is 35:1, the diameter D = 120mm, the feed section temperature of the fifth screw melt extruder is 175℃, the compression section temperature is 195℃, and the metering section temperature is 185℃.

[0077] The first, second, third, fourth, and fifth screw melt extruders of S2 extrude molten raw materials at proportions of 20%, 10%, 40%, 10%, and 20%, respectively. The molten raw materials are then fed into the distributor through the first, second, third, fourth, and fifth connecting pipes, respectively, and conveyed to the five-layer forming die to form a flowing melt. The flowing melt is then extruded through the five-layer forming die to obtain a cylindrical film bubble.

[0078] S3 lifts the cylindrical membrane bubble to the first traction machine, and the cylindrical membrane bubble forms a closed cylindrical cavity between the five-layer forming mold and the first traction machine; the inlet fan injects air into the cylindrical cavity, and the outlet fan discharges the air from the cylindrical cavity. The inlet fan and outlet fan are controlled according to a lateral stretching ratio of 1:1.2 to form a cylindrical cavity with a stable diameter.

[0079] The first traction machine (S4) controls the traction speed at a longitudinal stretch ratio of 1:1.2 to form a cylindrical cavity with a stable thickness. The cylindrical cavity is cut by the cutting assembly and unfolded by the membrane unfolding frame to form a geomembrane with a stable width and thickness. After being pulled by the second traction machine, the membrane storage frame, and the third traction machine, it is cut into rolls by the friction roll forming machine to obtain a high puncture-resistant polyethylene geomembrane.

[0080] Example 2

[0081] Preparation method of modified linear low-density polyethylene resin:

[0082] S01 mixes 15 parts of modified nano-silica, 10 parts of nano-titanium dioxide, 8 parts of maleic anhydride-grafted polyethylene, 1.5 parts of antioxidant, and 0.1 parts of ultraviolet absorber evenly to obtain a premix.

[0083] S02 The premixed material is added to 100 parts of linear low-density polyethylene resin and co-extruded using a twin-screw extruder at a temperature of 220℃.

[0084] SO3 is cooled and granulated to obtain modified linear low-density polyethylene resin.

[0085] Preparation method of high puncture-resistant polyethylene geomembrane:

[0086] The S1 first quantitative feeder extracts 100 parts of modified linear low-density polyethylene resin and 10 parts of double-anti-corrosion black masterbatch from the first and fifth hoppers respectively, mixes them thoroughly, and feeds them into the first screw melt extruder through the first hopper. The first screw melt extruder has a length-to-diameter ratio of 35:1 and a diameter D = 120 mm. The temperature of the feeding section of the first screw melt extruder is 185℃, the temperature of the compression section is 205℃, and the temperature of the metering section is 195℃.

[0087] The second quantitative feeder extracts 60 parts of medium-density polyethylene resin, 55 parts of metallocene high-density polyethylene resin, and 10 parts of double-antioxidant black masterbatch from the third, second, and fifth hoppers, respectively, mixes them thoroughly, and feeds them into the second screw melt extruder through the second hopper. The length-to-diameter ratio of the second screw melt extruder is 35:1, the diameter D = 150 mm, the feed section temperature of the second screw melt extruder is 185℃, the compression section temperature is 205℃, and the metering section temperature is 195℃.

[0088] The third quantitative feeder extracts 80 parts of medium-density polyethylene resin, 35 parts of linear low-density polyethylene resin, and 10 parts of double-anti-corrosion black masterbatch from the third, fourth, and fifth hoppers, respectively, mixes them thoroughly, and feeds them into the third screw melt extruder through the third hopper. The length-to-diameter ratio of the third screw melt extruder is 35:1, the diameter D = 180 mm, the feed section temperature of the third screw melt extruder is 185℃, the compression section temperature is 205℃, and the metering section temperature is 195℃.

[0089] The fourth quantitative feeder extracts 60 parts of medium-density polyethylene resin, 55 parts of metallocene high-density polyethylene resin, and 10 parts of double-antioxidant black masterbatch from the third, second, and fifth hoppers, respectively, mixes them thoroughly, and feeds them into the fourth screw melt extruder through the fourth hopper. The fourth screw melt extruder has a length-to-diameter ratio of 35:1, a diameter D = 150 mm, and the feed section temperature of the fourth screw melt extruder is 185℃, the compression section temperature is 205℃, and the metering section temperature is 195℃.

[0090] The fifth quantitative feeder extracts 100 parts of modified linear low-density polyethylene resin and 10 parts of double-resistant black masterbatch from the first and fifth hoppers respectively, mixes them thoroughly, and feeds them into the fifth screw melt extruder through the fifth hopper. The fifth screw melt extruder has a length-to-diameter ratio of 35:1 and a diameter D = 120 mm. The feed section temperature of the fifth screw melt extruder is 185℃, the compression section temperature is 205℃, and the metering section temperature is 195℃.

[0091] The first, second, third, fourth, and fifth screw melt extruders of S2 extrude molten raw materials at proportions of 15%, 15%, 40%, 15%, and 15%, respectively. The molten raw materials are then fed into the distributor through the first, second, third, fourth, and fifth connecting pipes, respectively, and conveyed to the five-layer forming die to form a flowing melt. The flowing melt is then extruded through the five-layer forming die to obtain a cylindrical film bubble.

[0092] S3 lifts the cylindrical membrane bubble to the first traction machine, and the cylindrical membrane bubble forms a closed cylindrical cavity between the five-layer forming mold and the first traction machine; the inlet fan injects air into the cylindrical cavity, and the outlet fan discharges the air from the cylindrical cavity. The inlet fan and outlet fan are controlled according to a lateral stretching ratio of 1:1.4 to form a cylindrical cavity with a stable diameter.

[0093] The first traction machine (S4) controls the traction speed at a longitudinal stretch ratio of 1:1.4 to form a cylindrical cavity with a stable thickness. The cylindrical cavity is cut by the cutting assembly and unfolded by the membrane unfolding frame to form a geomembrane with a stable width and thickness. After being pulled by the second traction machine, the membrane storage frame, and the third traction machine, it is cut into rolls by the friction roll forming machine to obtain a high puncture-resistant polyethylene geomembrane.

[0094] Example 3

[0095] Preparation method of modified linear low-density polyethylene resin:

[0096] S01 mixes 10 parts of modified nano-silica, 5 parts of nano-titanium dioxide, 5 parts of maleic anhydride-grafted polyethylene, 1 part of antioxidant, and 0.1 parts of ultraviolet absorber evenly to obtain a premix.

[0097] S02 The premixed material is added to 90 parts of linear low-density polyethylene resin and co-extruded using a twin-screw extruder at a temperature of 200℃.

[0098] SO3 is cooled and granulated to obtain modified linear low-density polyethylene resin.

[0099] Preparation method of high puncture-resistant polyethylene geomembrane:

[0100] The S1 first quantitative feeder extracts 95 parts of modified linear low-density polyethylene resin and 5 parts of double-anti-corrosion black masterbatch from the first and fifth hoppers respectively, mixes them thoroughly, and feeds them into the first screw melt extruder through the first hopper. The first screw melt extruder has a length-to-diameter ratio of 35:1 and a diameter D = 120 mm. The temperature of the feeding section of the first screw melt extruder is 180℃, the temperature of the compression section is 200℃, and the temperature of the metering section is 190℃.

[0101] The second quantitative feeder extracts 50 parts of medium-density polyethylene resin, 45 parts of metallocene high-density polyethylene resin, and 5 parts of double-antioxidant black masterbatch from the third, second, and fifth hoppers, respectively, mixes them thoroughly, and feeds them into the second screw melt extruder through the second hopper. The length-to-diameter ratio of the second screw melt extruder is 35:1, the diameter D = 150 mm, the feed section temperature of the second screw melt extruder is 180℃, the compression section temperature is 200℃, and the metering section temperature is 190℃.

[0102] The third quantitative feeder extracts 70 parts of medium-density polyethylene resin, 25 parts of linear low-density polyethylene resin, and 5 parts of double-anti-corrosion black masterbatch from the third, fourth, and fifth hoppers, respectively, mixes them thoroughly, and feeds them into the third screw melt extruder through the third hopper. The length-to-diameter ratio of the third screw melt extruder is 35:1, the diameter D = 180 mm, the feed section temperature of the third screw melt extruder is 180℃, the compression section temperature is 200℃, and the metering section temperature is 190℃.

[0103] The fourth quantitative feeder extracts 50 parts of medium-density polyethylene resin, 45 parts of metallocene high-density polyethylene resin, and 5 parts of double-antioxidant black masterbatch from the third, second, and fifth hoppers, respectively, mixes them thoroughly, and feeds them into the fourth screw melt extruder through the fourth hopper. The fourth screw melt extruder has a length-to-diameter ratio of 35:1 and a diameter D = 150 mm. The feed section temperature of the fourth screw melt extruder is 180℃, the compression section temperature is 200℃, and the metering section temperature is 190℃.

[0104] The fifth quantitative feeder extracts 95 parts of modified linear low-density polyethylene resin and 5 parts of double-anti-corrosion black masterbatch from the first and fifth hoppers respectively, mixes them thoroughly, and feeds them into the fifth screw melt extruder through the fifth hopper. The length-to-diameter ratio of the fifth screw melt extruder is 35:1, the diameter D = 120mm, the feed section temperature of the fifth screw melt extruder is 180℃, the compression section temperature is 200℃, and the metering section temperature is 190℃.

[0105] The first, second, third, fourth, and fifth screw melt extruders of S2 extrude molten raw materials at proportions of 10%, 20%, 40%, 20%, and 10%, respectively. The molten raw materials are then fed into the distributor through the first, second, third, fourth, and fifth connecting pipes, and conveyed to the five-layer forming die to form a flowing melt. The flowing melt is then extruded through the five-layer forming die to obtain a cylindrical film bubble.

[0106] S3 lifts the cylindrical membrane bubble to the first traction machine, and the cylindrical membrane bubble forms a closed cylindrical cavity between the five-layer forming mold and the first traction machine; the inlet fan injects air into the cylindrical cavity, and the outlet fan discharges the air from the cylindrical cavity. The inlet fan and outlet fan are controlled according to a lateral stretching ratio of 1:1.3 to form a cylindrical cavity with a stable diameter.

[0107] The first traction machine (S4) controls the traction speed at a longitudinal stretch ratio of 1:1.3 to form a cylindrical cavity with a stable thickness. The cylindrical cavity is cut by the cutting assembly and unfolded by the membrane unfolding frame to form a geomembrane with a stable width and thickness. After being pulled by the second traction machine, the membrane storage frame, and the third traction machine, it is cut into rolls by the friction roll forming machine to obtain a high puncture-resistant polyethylene geomembrane.

[0108] Example 4

[0109] The difference between Example 4 and Example 3 is that the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder extruded the melt raw material in proportions of 10%, 10%, 60%, 10%, and 10%, respectively, while the rest are the same.

[0110] Example 5

[0111] The difference between Example 5 and Example 3 is that the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder extruded the melt raw material in proportions of 20%, 20%, 20%, 20%, and 20%, respectively, while the rest are the same.

[0112] Example 6

[0113] The difference between Example 6 and Example 3 is that the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder extruded the melt raw material in proportions of 30%, 10%, 20%, 10%, and 30%, respectively, while the rest are the same.

[0114] Example 7

[0115] The difference between Example 7 and Example 3 is that the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder extruded the melt raw material in proportions of 10%, 30%, 20%, 30%, and 10%, respectively, while the rest are the same.

[0116] Example 8

[0117] The difference between Example 8 and Example 3 is that in S3 and S4, the transverse draw ratio and the longitudinal draw ratio are both 1.7, while the rest are the same.

[0118] Example 9

[0119] The difference between Example 9 and Example 3 is that in S3 and S4, the transverse draw ratio and the longitudinal draw ratio are both 1.1, while the rest are the same.

[0120] Example 10

[0121] The difference between Example 10 and Example 3 is that the feed section temperature of the first, second, third, fourth, and fifth screw melt extruders is 200°C, the compression section temperature is 220°C, and the metering section temperature is 210°C; all other conditions are the same.

[0122] Example 11

[0123] The difference between Example 11 and Example 3 is that the modified linear low-density polyethylene resin does not include modified nano-silica, while the rest are the same.

[0124] Example 12

[0125] The difference between Example 12 and Example 3 is that the modified nano-silica in the modified linear low-density polyethylene resin is not modified, while the rest are the same.

[0126] Example 13

[0127] The difference between Example 13 and Example 3 is that in the preparation method of modified nano-silica, the silane coupling agent is KH550, and the rest are the same.

[0128] Example 14

[0129] The difference between Example 14 and Example 3 is that the modified linear low-density polyethylene resin does not include nano-titanium dioxide, but all other aspects are the same.

[0130] Example 15

[0131] The difference between Example 15 and Example 3 is that the modified linear low-density polyethylene resin does not include maleic anhydride polyethylene, while the rest are the same.

[0132] Comparative Example 1

[0133] The difference between Comparative Example 1 and Example 3 is that the upper membrane, the first middle membrane, the inner membrane, the second middle membrane, and the lower membrane all contain 95 parts of modified linear low-density polyethylene resin and 5 parts of double-resistant black masterbatch, while the rest are the same.

[0134] Comparative Example 2

[0135] The difference between Comparative Example 2 and Example 3 is that the upper membrane, the first middle membrane, the inner membrane, the second middle membrane, and the lower membrane all contain 50 parts of medium-density polyethylene resin, 45 parts of metallocene high-density polyethylene resin, and 5 parts of double-antioxidant black masterbatch, while the rest are the same.

[0136] Comparative Example 3

[0137] The difference between Comparative Example 3 and Example 3 is that the upper membrane, the first middle membrane, the inner membrane, the second middle membrane, and the lower membrane all contain 70 parts of medium-density polyethylene resin, 25 parts of linear low-density polyethylene resin, and 5 parts of double-antioxidant black masterbatch, while the rest are the same.

[0138] Comparative Example 4

[0139] The difference between Comparative Example 4 and Example 3 is that linear low-density polyethylene resin is used instead of modified linear low-density polyethylene resin, while the rest are the same.

[0140] Experimental Example 1

[0141] The longitudinal and transverse tensile properties, puncture resistance, environmental stress cracking resistance, and oxidation resistance of the polyethylene geomembrane prepared by the above method were tested, and the test results are shown in Table 1.

[0142] Table 1 Performance Test Results

[0143]

[0144]

[0145] As shown in Table 1, the polyethylene geomembrane provided in this application has excellent puncture resistance and environmental stress cracking resistance, and can adapt to seepage prevention projects in harsh environments.

[0146] Depend on Figures 1-3 It is understood that the production device for high puncture-resistant polyethylene geomembrane provided in this application obtains high puncture-resistant polyethylene geomembrane through five layers of co-extrusion blow molding via a centralized feeding mechanism, a melt extrusion mechanism, a mold forming mechanism, an internal cooling control mechanism, and a traction rolling mechanism.

[0147] In one embodiment, the first feeding assembly includes a first hopper 35, a first quantitative feeder 2, and a first hopper 3; the second feeding assembly includes a second hopper 34, a second quantitative feeder 5, and a second hopper 6; the third feeding assembly includes a third hopper 33, a third quantitative feeder 8, and a third hopper 9; the fourth feeding assembly includes a fourth hopper 32, a fourth quantitative feeder 11, and a fourth hopper 12; and the fifth feeding assembly includes a fifth hopper 31, a fifth quantitative feeder 14, and a fifth hopper 15. The first hopper 3, the second hopper 6, the third hopper 9, the fourth hopper 12, and the fifth hopper 15 are respectively located below the first quantitative feeder 2, the second quantitative feeder 5, the third quantitative feeder 8, the fourth quantitative feeder 11, and the fifth quantitative feeder 14.

[0148] Specifically, the first silo 35 is used to store modified linear low-density polyethylene resin, the second silo 34 is used to store metallocene high-density polyethylene resin, the third silo 33 is used to store medium-density polyethylene resin, the fourth silo 32 is used to store linear low-density polyethylene resin, and the fifth silo 31 is used to store double-resistant black masterbatch.

[0149] Specifically, the first quantitative feeder 2, the second quantitative feeder 5, the third quantitative feeder 8, the fourth quantitative feeder 11, and the fifth quantitative feeder 14 extract raw materials from the corresponding hoppers according to the formula ratio and mix them thoroughly. After mixing, the raw materials are fed into the corresponding first hopper 3, second hopper 6, third hopper 9, fourth hopper 12, and fifth hopper 15.

[0150] In one embodiment, the melt extrusion mechanism includes a first screw melt extruder 1, a second screw melt extruder 4, a third screw melt extruder 7, a fourth screw melt extruder 10, and a fifth screw melt extruder 13, which are respectively located below the first hopper 3, the second hopper 6, the third hopper 9, the fourth hopper 12, and the fifth hopper 15.

[0151] Specifically, the first screw melt extruder 1, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder heat and melt the mixed raw materials fed into the first hopper 3, the second hopper 6, the third hopper 9, the fourth hopper 12, and the fifth hopper 15, respectively, and then extrude them to the die forming mechanism.

[0152] In one embodiment, the mold forming mechanism includes a connecting pipe assembly, a fluid distributor 16, a five-layer forming mold 17, and a herringbone frame 19; the connecting pipe assembly includes a first connecting pipe 36, a second connecting pipe 37, a third connecting pipe 38, a fourth connecting pipe 39, and a fifth connecting pipe 40; the first connecting pipe 36, the second connecting pipe 37, the third connecting pipe 38, the fourth connecting pipe 39, and the fifth connecting pipe 40 are respectively connected to the first screw melt extruder 1, the second screw melt extruder 4, the third screw melt extruder 7, the fourth screw melt extruder 10, the fifth screw melt extruder 13, and the fluid distributor 16, and the fluid distributor 16 is connected to the five-layer forming mold 17.

[0153] Specifically, a flowing melt 46 is formed in the five-layer molding die 17 and extruded through the five-layer molding die 17.

[0154] Specifically, the A-frame 19 is equipped with a guide tube 20.

[0155] In one implementation, the internal cooling control mechanism includes an inlet fan 50, an outlet fan 51, a width probe 48, an inlet duct, and an outlet duct; the inlet duct connects the inlet fan 50 to the five-layer forming mold 17, and the outlet duct connects the outlet fan 51 to the five-layer forming mold 17; the traction and winding mechanism sequentially includes a first traction machine 21, a slitting knife assembly, an upper guide roller 24, a film spreading frame 25, a lower guide roller 26, a second traction machine 27, a film storage frame 28, a third traction machine 29, and a friction winding machine 30; the slitting knife assembly includes a slitting knife. 23 and the cutting tool support 22; the five-layer molding mold 17 includes a mold body, an air inlet 47 and an air outlet 49. The mold body is provided with flow channels, which include a first flow channel 41, a second flow channel 42, a third flow channel 43, a fourth flow channel 44 and a fifth flow channel 45. The first flow channel 41, the second flow channel 42, the third flow channel 43, the fourth flow channel 44 and the fifth flow channel 45 are respectively connected to the first connecting pipe 36, the second connecting pipe 37, the third connecting pipe 38, the fourth connecting pipe 39 and the fifth connecting pipe 40.

[0156] Specifically, the five-layer forming mold 17 collects the raw materials conveyed by the distributor 16 and extrudes the geomembrane bubble 18 from above the mold. The A-frame 19 stably conveys the extruded and cooled geomembrane bubble 18 upward to the first traction machine 21.

[0157] Specifically, a five-layer membrane structure consisting of an upper membrane 52, a first middle membrane 53, an inner membrane 54, a second middle membrane 55, and a lower membrane 56 is formed through a five-layer molding mold 17.

[0158] Specifically, the width probe 48 is used to control the width of the geomembrane bubble 18.

[0159] 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 production process for a high puncture-resistant polyethylene geomembrane, characterized in that, Includes the following steps: S1 First quantitative feeder, Second quantitative feeder, Third quantitative feeder, Fourth quantitative feeder, and Fifth quantitative feeder extract raw materials from the First, Second, Third, Fourth, and Fifth hoppers according to a ratio and mix them thoroughly. The raw materials then enter the First, Second, Third, Fourth, and Fifth Screw Melt Extruders respectively through the First, Second, Third, Fourth, and Fifth Hoppers. The first, second, third, fourth, and fifth screw melt extruders of S2 extrude molten raw materials, which are then fed into the distributor via the first, second, third, fourth, and fifth connecting pipes, respectively. The materials are then transported to the five-layer forming die to form a flowing melt. The flowing melt is extruded through the five-layer forming die to obtain a cylindrical film bubble. S3 lifts the cylindrical membrane bubble to the first traction machine, and the cylindrical membrane bubble forms a closed cylindrical cavity between the five-layer forming mold and the first traction machine; the inlet fan injects air into the cylindrical cavity, and the outlet fan discharges the air from the cylindrical cavity. The inlet fan and outlet fan are controlled according to a transverse stretching ratio of 1: (1.2~1.4) to form a cylindrical cavity with a stable diameter. The first traction machine (S4) controls the traction speed according to a longitudinal stretch ratio of 1:(1.2~1.4) to form a cylindrical cavity with a stable thickness. The cylindrical cavity is cut by the cutting assembly and unfolded by the membrane unfolding frame to form a geomembrane with a stable width and stable thickness. After being pulled by the second traction machine, the membrane storage frame, and the third traction machine, it is cut into rolls by the friction roll forming machine to obtain a high puncture-resistant polyethylene geomembrane. The high puncture-resistant polyethylene geomembrane comprises, from top to bottom, an upper membrane, a first middle membrane, an inner membrane, a second middle membrane, and a lower membrane. By weight, the upper and lower membranes each comprise 90-100 parts of modified linear low-density polyethylene resin and 2-10 parts of dual-resistant black masterbatch; the first and second middle membranes each comprise 40-60 parts of medium-density polyethylene resin, 35-55 parts of metallocene high-density polyethylene resin, and 2-10 parts of dual-resistant black masterbatch; and the inner membrane comprises 60-80 parts of medium-density polyethylene resin, 15-35 parts of linear low-density polyethylene resin, and 2-10 parts of dual-resistant black masterbatch. Based on parts by weight, the modified linear low-density polyethylene resin comprises 80-100 parts of linear low-density polyethylene, 5-15 parts of modified nano-silica, 5-10 parts of nano-titanium dioxide, 2-8 parts of maleic anhydride-grafted polyethylene, 0.5-1.5 parts of antioxidant, and 0.05-0.1 parts of ultraviolet absorber; the modified nano-silica is prepared by modification with a silane coupling agent.

2. The production process of the high puncture-resistant polyethylene geomembrane according to claim 1, characterized in that, The method for preparing the modified nano-silica includes the following steps: (1) Disperse nano-silica in ethanol to obtain nano-silica dispersion; (2) Add silane coupling agent to the nano silica dispersion, heat and stir; (3) Centrifuge and vacuum dry to obtain modified nano-silica.

3. The production process of the high puncture-resistant polyethylene geomembrane according to claim 1, characterized in that, In S2, the length-to-diameter ratio of the first, second, third, fourth, and fifth screw melt extruders is 35:

1. The feed section temperature is 175~185°C, the compression section temperature is 195~205°C, and the metering section temperature is 185~195°C. The diameters of the first, second, and third screw melt extruders are D1=120mm, D2=150mm, D3=180mm, D4=150mm, and D5=120mm.

4. A production apparatus for implementing the production process of high puncture-resistant polyethylene geomembrane according to any one of claims 1 to 3, characterized in that, It includes, in sequence, a centralized feeding mechanism, a melt extrusion mechanism, a die forming mechanism, an internal cooling control mechanism, and a traction coiling mechanism; the centralized feeding mechanism includes a first feeding component, a second feeding component, a third feeding component, a fourth feeding component, and a fifth feeding component.

5. The production apparatus according to claim 4, characterized in that, The first feeding assembly includes a first hopper, a first quantitative feeder, and a first hopper; the second feeding assembly includes a second hopper, a second quantitative feeder, and a second hopper; the third feeding assembly includes a third hopper, a third quantitative feeder, and a third hopper; the fourth feeding assembly includes a fourth hopper, a fourth quantitative feeder, and a fourth hopper; the fifth feeding assembly includes a fifth hopper, a fifth quantitative feeder, and a fifth hopper, wherein the first hopper, the second hopper, the third hopper, the fourth hopper, and the fifth hopper are respectively located below the first quantitative feeder, the second quantitative feeder, the third quantitative feeder, the fourth quantitative feeder, and the fifth quantitative feeder.

6. The production apparatus according to claim 5, characterized in that, The melt extrusion mechanism includes a first screw melt extruder, a second screw melt extruder, a third screw melt extruder, a fourth screw melt extruder, and a fifth screw melt extruder, which are respectively located below the first hopper, the second hopper, the third hopper, the fourth hopper, and the fifth hopper.

7. The production apparatus according to claim 4, characterized in that, The mold forming mechanism includes a connecting pipe assembly, a fluid distributor, a five-layer forming mold, and a herringbone frame; the connecting pipe assembly includes a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, and a fifth connecting pipe; the first connecting pipe, the second connecting pipe, the third connecting pipe, the fourth connecting pipe, and the fifth connecting pipe are respectively connected to the first screw melt extruder, the second screw melt extruder, the third screw melt extruder, the fourth screw melt extruder, and the fifth screw melt extruder and the fluid distributor, and the fluid distributor is connected to the five-layer forming mold.

8. The production apparatus according to claim 4, characterized in that, The internal cooling control mechanism includes an air inlet fan, an air outlet fan, a width probe, an air inlet pipe, and an air outlet pipe; the air inlet pipe connects the air inlet fan to the five-layer forming mold, and the air outlet pipe connects the air outlet fan to the five-layer forming mold; the traction and winding mechanism sequentially includes a first traction machine, a slitting knife assembly, an upper guide roller, a film spreading frame, a lower guide roller, a second traction machine, a film storage frame, a third traction machine, and a friction winding machine; the slitting knife assembly includes a slitting knife and a slitting knife support; the five-layer forming mold includes a mold body, an air inlet, and an air outlet; the mold body has flow channels inside, including a first flow channel, a second flow channel, a third flow channel, a fourth flow channel, and a fifth flow channel, which are respectively connected to a first connecting pipe, a second connecting pipe, a third connecting pipe, a fourth connecting pipe, and a fifth connecting pipe.

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