High-strength corrugated pipe for drainage and method for manufacturing the same

Abstract

The application discloses a kind of high-strength corrugated pipes for drainage and manufacturing method thereof, belong to the technical field of corrugated pipe.The corrugated pipe includes the following weight parts components: 50-75 parts of PVC, 8-15 parts of HPVC, 5-15 parts of HNBR, 5-10 parts of modified filler, 4-8 parts of toughening agent, 1-2 parts of antioxidant, 1-3 parts of heat stabilizer, 0.4-1.1 parts of lubricant.By the raw materials of above-mentioned formula are mixed at high speed, using one-step continuous extrusion molding process, under the temperature parameter and blow pressure of accurate control, plasticizing, extruding, blow setting, traction cutting preparation obtains high-strength corrugated pipe for drainage.Compared with prior art, the high-strength corrugated pipe for drainage of the application solves the problem of poor filler dispersibility and weak interface bonding through multi-level synergistic effect.Testing shows that the corrugated pipe of the application has high ring stiffness and excellent low-temperature impact resistance, long service life, and is especially suitable for high-standard drainage engineering.

Description

Technical Field

[0001] This invention relates to the field of corrugated pipe technology, and in particular to a high-strength corrugated pipe for drainage and its manufacturing method. Background Technology

[0002] Plastic corrugated pipes for drainage and ventilation are widely used in municipal, construction, and industrial fields due to their advantages such as light weight, corrosion resistance, and strong flow capacity. Their core performance indicators mainly include ring stiffness, impact toughness, especially low-temperature toughness and long-term durability. Currently, mainstream technologies mostly use polyvinyl chloride (PVC) and its modified materials as the matrix, and improve mechanical properties by adding reinforcing fillers and toughening agents.

[0003] Existing technologies have explored this area extensively. For example, Chinese Patent Publication No. CN120156135A discloses a high-tensile-strength polytetrafluoroethylene (PTFE) film and its preparation process. This technology involves preparing a composite raw material of epoxy-based tetrafluoroethylene copolymer and composite filler, followed by cold pressing and sintering processes to obtain the film. However, this technology is mainly aimed at the specific form of PTFE film, and its complex preparation process is difficult to apply to the manufacture of large-diameter, continuously extruded corrugated pipes. Furthermore, the high cost of PTFE raw materials fails to meet the economic requirements of drainage pipes.

[0004] Another Chinese patent publication, CN120590725A, directly relates to a low-temperature resistant PVC corrugated pipe. It improves low-temperature performance by introducing functional additives into a PVC / HPVC / HNBR system with a specific ratio. While this technology focuses on the low-temperature resistance of the corrugated pipe, its core lies in optimizing interfacial compatibility through ethylene-vinyl acetate copolymer grafts. Its reinforcing effect mainly relies on polymer toughening, offering limited contribution to significantly improving the pipe's ring stiffness. Furthermore, it fails to address the fundamental problem of poor filler dispersion and stress concentration under high filler loading.

[0005] In summary, existing technologies have significant limitations: either, like CN120156135A, their material systems and processes are incompatible with the low-cost, high-efficiency extrusion processing requirements of corrugated pipes; or, like CN120590725A, their modification approaches struggle to simultaneously achieve the high rigidity, high toughness, and excellent long-term performance of corrugated pipes, particularly failing to fundamentally resolve the core contradiction between the dispersion and interfacial bonding of reinforcing fillers in the polymer matrix. Therefore, developing a high-performance drainage corrugated pipe manufacturing technology that achieves high strength, high toughness, balanced performance, and a feasible process has become an urgent problem to be solved in this field. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention aims to provide a high-strength corrugated pipe for drainage that significantly improves rigidity and toughness through modified fillers with synergistic effects, and a method for manufacturing the same.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] A high-strength corrugated pipe for drainage comprises the following components in parts by weight:

[0009] 50-75 parts PVC, 8-15 parts HPVC, 5-15 parts HNBR, 5-10 parts modified filler, 4-8 parts toughening agent, 1-2 parts antioxidant, 1-3 parts heat stabilizer, 0.4-1.1 parts lubricant.

[0010] The modified filler is prepared as follows:

[0011] Carboxylated carbon nanotubes were added to water to prepare a dispersion. After heating, divalent and trivalent metal nitrates were added and stirred to dissolve. The system was then cooled, and amino acids and / or amino acid derivatives were added dropwise under a nitrogen atmosphere. The pH was adjusted using sodium hydroxide aqueous solution. The mixture was then reacted at high temperature. After the reaction was completed, the modified filler was obtained by filtration, washing, and drying.

[0012] The antioxidant is at least one of antioxidant 4010, antioxidant DPPD, or antioxidant DNP.

[0013] The toughening agent is at least one of ethylene-octene copolymer and ethylene-propylene copolymer.

[0014] The lubricant is at least one of PE wax, EVA wax, calcium stearate, and ethylene distearate amine.

[0015] The heat stabilizer is at least one of a composite lead salt stabilizer, a calcium-zinc stabilizer, or an organotin stabilizer.

[0016] Preferably, the modified filler is prepared by the following method, in parts by weight:

[0017] First, weigh out 3-8 parts of carboxylated carbon nanotubes, 3-8 parts of divalent metal nitrates, 1-5 parts of trivalent metal nitrates, and 1-5 parts of amino acids and / or amino acid derivatives for later use. Add the carboxylated carbon nanotubes to water to prepare a dispersion of 2-6 mg / mL. Heat the solution to 70-90℃ and then add the divalent and trivalent metal nitrates, stirring until completely dissolved. Subsequently, cool the system to 50-60℃ and add the amino acids and / or amino acid derivatives dropwise under a nitrogen atmosphere. Adjust the pH to 8-10 using a 1-4 mol / L sodium hydroxide aqueous solution. Transfer the mixture to a hydrothermal reactor and maintain the reaction at 80-90℃ for 5-20 hours. After the reaction is completed, filter, wash, and dry to obtain the modified filler.

[0018] The divalent metal nitrate is at least one of magnesium nitrate, zinc nitrate, and strontium nitrate.

[0019] The trivalent metal nitrate is at least one of ferric nitrate and chromium nitrate.

[0020] Preferably, the divalent metal nitrate is zinc nitrate; and the trivalent metal nitrate is ferric nitrate.

[0021] The amino acid is at least one of glutamic acid, aspartic acid, and cystine; the amino acid derivative is at least one of D-penicillamine, 2-aminoterephthalic acid, 2-methylcysteine, p-aminobenzoic acid, 2,5-diaminobenzoic acid, carboxymethylcysteine, 3-aminotetrahydrothiophene-3-carboxylic acid, and 3-amino-1,2,4-triazole-5-carboxylic acid.

[0022] Preferably, the amino acid derivative is composed of 2-aminoterephthalic acid and D-penicillamine in a mass ratio of 0.5-2:0.5-2.

[0023] More preferably, the amino acid derivative is composed of 2-aminoterephthalic acid, D-penicillamine, and 3-amino-1,2,4-triazole-5-carboxylic acid in a mass ratio of 0.5-2:0.5-2:0.1-0.3.

[0024] The manufacturing method of the high-strength corrugated pipe for drainage is as follows:

[0025] First, weigh out PVC, HPVC, HNBR, modified filler, toughening agent, antioxidant, heat stabilizer, and lubricant according to their weight proportions. Put all raw materials into a high-speed mixer and stir at a speed of 500-1000 r / min for 10-50 minutes. Then, feed the mixed material into a twin-screw extruder for plasticizing and extrusion molding. The set temperatures for each section of the extruder are as follows: feeding section 150-160℃, compression section 160-180℃, metering section 170-190℃, die head 180-190℃, and die 185-195℃. After the molten material is extruded through the die, it is blown into shape under compressed air at 0.12-0.18MPa and then put into a corrugated forming mold at 40-60℃ for shaping. Finally, it is pulled at a constant speed of 3-8 m / min by a traction machine and cut to a fixed length to obtain a high-strength corrugated pipe for drainage.

[0026] This invention stems from a profound understanding of the core problems of traditional fillers in polymer matrices: poor dispersibility and weak interfacial bonding. To address this issue, a core-shell modified filler was conceived, using carboxylated carbon nanotubes as the core and layered bimetallic hydroxides with intercalated amino acids or amino acid derivatives as the shell. The aim is to improve dispersion through the layered structure and utilize the functional groups of amino acids or amino acid derivatives to achieve initial bridging between the filler and the matrix. Furthermore, to overcome the limitations of single interfacial modification, a synergistic system of multifunctional amino acids or amino acid derivatives was designed. First, 2-aminoterephthalic acid was selected as a rigid framework support. Then, D-penicillamine was introduced to achieve strong anchoring using its thiol groups. Finally, 3-amino-1,2,4-triazole-5-carboxylic acid was added, and a stable three-dimensional interfacial network was constructed through the coordination of its heterocyclic rings. Ultimately, a significant and simultaneous improvement in the rigidity and toughness of the drainage corrugated pipe was successfully achieved.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] 1) This invention constructs a robust reinforcing network within the matrix through modified fillers. This improves the ring stiffness of the pipe and enhances its low-temperature impact resistance, solving the industry challenge of balancing strength and toughness.

[0029] 2) In existing technologies, fillers are prone to agglomeration, forming stress concentration points. This invention utilizes a hydrothermal method to grow carboxylated carbon nanotubes in situ, and intercalates them with amino acids or amino acid derivatives to create intercalation bridges, enabling the filler to be uniformly dispersed at the nanoscale and forming a strong interfacial bond with matrices such as PVC and HNBR. This eliminates performance defects caused by agglomeration, allowing the material's performance potential to be fully realized, resulting in uniform and stable performance.

[0030] 3) The corrugated pipe prepared by this invention not only has superior instantaneous mechanical properties, but its dense interface structure and the stability of the filler itself also endow the product with excellent creep resistance, heat aging resistance, and dimensional stability. This enables the pipe to maintain stable performance under harsh environments such as long-term loads and temperature changes, significantly extending its service life and making it suitable for scenarios with higher requirements such as deep burial drainage and industrial sewage discharge. Detailed Implementation

[0031] Some material parameters and their sources:

[0032] PVC, grade: OxyVinyls® 226, brand: Occidental Petroleum Ethylene Company, USA.

[0033] HPVC, grade: 8001, brand: Formosa Plastics.

[0034] HNBR, Product Name: Zetpol® 1010, Brand: Zeon Japan.

[0035] Ethylene-octene copolymer, grade: POE8440, brand: Dow Chemical.

[0036] Calcium and zinc stabilizer, product number: ADK STAB RUP-129, brand: Adik, Japan.

[0037] Carboxylated carbon nanotubes, grade: 755125, brand: Merck, Germany.

[0038] PE wax, grade: AC-6(A), brand: Honeywell.

[0039] All other raw materials used in the embodiments and comparative examples of this invention are commercially available products.

[0040] Example 1

[0041] A method for manufacturing a high-strength corrugated pipe for drainage is as follows, in parts by weight:

[0042] First, weigh out 65 parts PVC, 12 parts HPVC, 10 parts HNBR, 8 parts modified filler, 6 parts ethylene-octene copolymer, 1.8 parts antioxidant 4010, 2 parts calcium-zinc stabilizer, 0.2 parts PE wax, and 0.5 parts calcium stearate. Put all raw materials into a high-speed mixer and stir at 800 r / min for 30 minutes. Then, feed the mixed material into a twin-screw extruder for plasticizing and extrusion molding. The set temperatures of each section of the extruder are as follows: feeding section 155℃, compression section 170℃, metering section 180℃, die head 185℃, and die 190℃. After the molten material is extruded through the die, it is blown into shape under compressed air at 0.15 MPa and then placed into a corrugated forming mold at 50℃ for shaping. Finally, it is pulled at a constant speed of 5 m / min by a traction machine and cut to a fixed length to obtain a high-strength corrugated pipe for drainage.

[0043] The modified filler is prepared by the following method, in parts by weight:

[0044] First, weigh out 5 parts of carboxylated carbon nanotubes, 5 parts of divalent metal nitrates, 3 parts of trivalent metal nitrates, and 3 parts of amino acid derivatives for later use. Add the carboxylated carbon nanotubes to water to prepare a 4 mg / mL dispersion. Heat the solution to 80°C and then add the divalent and trivalent metal nitrates, stirring until completely dissolved. Subsequently, cool the system to 55°C and add the amino acid derivative dropwise under a nitrogen atmosphere. Adjust the pH to 9 using a 3 mol / L sodium hydroxide aqueous solution. Transfer the mixture to a hydrothermal reactor and maintain the reaction at 90°C for 15 hours. After the reaction is complete, filter, wash, and dry to obtain the modified filler.

[0045] The divalent metal nitrate is zinc nitrate; the trivalent metal nitrate is ferric nitrate; and the amino acid derivative is 2-aminoterephthalic acid.

[0046] Example 2

[0047] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is D-penicillamine.

[0048] Example 3

[0049] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is 2,5-diaminobenzoic acid.

[0050] Example 4

[0051] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is 2-methylcysteine.

[0052] Example 5

[0053] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is carboxymethylcysteine.

[0054] Example 6

[0055] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is 3-aminotetrahydrothiophene-3-carboxylic acid.

[0056] Example 7

[0057] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is p-aminobenzoic acid.

[0058] Example 8

[0059] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is replaced with an amino acid, specifically glutamic acid.

[0060] Example 9

[0061] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is replaced with an amino acid, specifically aspartic acid.

[0062] Example 10

[0063] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is replaced with an amino acid, specifically cystine.

[0064] Example 11

[0065] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is composed of 2-aminoterephthalic acid and D-penicillamine in a mass ratio of 1:1.

[0066] Example 12

[0067] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is replaced with amino acids, specifically glutamic acid and aspartic acid in a mass ratio of 1:1.

[0068] Example 13

[0069] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is replaced by a mixture of amino acids and amino acid derivatives, specifically cystine and para-aminobenzoic acid in a mass ratio of 1:1.

[0070] Example 14

[0071] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is composed of 2-aminoterephthalic acid, D-penicillamine and 3-amino-1,2,4-triazole-5-carboxylic acid in a mass ratio of 1:1:0.2.

[0072] Comparative Example 1

[0073] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the amino acid derivative in the preparation method of the modified filler is replaced with an amino acid, specifically cysteine.

[0074] Comparative Example 2

[0075] The manufacturing method of a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the divalent metal nitrate in the preparation method of the modified filler is calcium nitrate and the trivalent metal nitrate is aluminum nitrate.

[0076] Comparative Example 3

[0077] A method for manufacturing a high-strength corrugated pipe for drainage is basically the same as that in Example 1, except that the modified filler is replaced with an equal amount of carboxylated carbon nanotubes.

[0078] Test Example 1

[0079] Ring stiffness testing

[0080] The testing standard refers to GB / T 9647-2015 "Determination of ring stiffness of thermoplastic pipes".

[0081] Test principle: A sample of a specified length is cut from the pipe and placed on an electronic universal testing machine. The sample is compressed vertically at a constant speed by upper and lower pressure plates until at least 30% radial deformation occurs. The ring stiffness of the pipe is calculated by continuously recording the force and deformation.

[0082] The test method is as follows: A 200±10mm long specimen was cut from each of the three pipes. The specimens were conditioned at 23±2℃ for 24 hours. The specimens were then placed in the center of the pressure plate of the testing machine and compressed at a rate of 5±1mm / min.

[0083] Data processing: The ring stiffness (S) was calculated according to the formula S=(0.0186+0.025Δy)×(F / Δy) in the standard, where F is the applied force and Δy is the corresponding vertical deformation. The final result is the average of multiple specimens.

[0084] The test results are shown in Table 1.

[0085] Table 1

[0086] Example 1 8.52 Example 2 8.21 Example 3 8.48 Example 4 8.15 Example 5 7.96 Example 6 8.03 Example 7 7.88 Example 8 7.65 Example 9 7.61 Example 10 7.32 Example 11 9.15 Example 12 7.64 Example 13 7.55 Example 14 9.48 Comparative Example 1 7.84 Comparative Example 2 7.9 Comparative Example 3 6.58

[0087] Test Example 2

[0088] Impact resistance test

[0089] The test standard refers to GB / T 14152-2001 "Test Method for Impact Resistance of Thermoplastic Pipes - Clockwise Rotation Method" to test the impact resistance at 0℃.

[0090] Test principle: The pipe sample is placed horizontally on an impact testing machine, and a drop hammer of a specified mass is dropped freely from a certain height. The number of impacts that cause the sample to dent is recorded to evaluate its impact resistance. The higher the number of impacts, the better the impact resistance.

[0091] Cut a sufficient number of samples (200±10) mm in length from the pipe. Immerse the samples in a low-temperature water bath at 0±1℃ for 2 hours.

[0092] Impact test: The conditioned specimen is placed on the testing machine within 10 seconds. A d90 punch is used to impact the specimen at an impact height of 2000 mm and a drop weight of 1.6 kg. The number of impacts that cause the specimen to dent is recorded.

[0093] The relevant test data are summarized in Table 2.

[0094] Table 2

[0095] Example 1 15 Example 2 17 Example 3 16 Example 4 16 Example 5 14 Example 6 13 Example 7 12 Example 8 10 Example 9 10 Example 10 8 Example 11 19 Example 12 10 Example 13 9 Example 14 20 Comparative Example 1 13 Comparative Example 2 14 Comparative Example 3 7

[0096] The high-strength corrugated pipe for drainage described in this invention, in Examples 1 to 10, exhibits significantly superior performance compared to Comparative Example 3. The fundamental reason for this is likely that Comparative Example 3 used only unmodified carboxylated carbon nanotubes, which are prone to agglomeration in the polymer matrix, forming stress concentration points, and exhibiting weak interfacial bonding with the matrix. In contrast, the modified filler prepared in this invention involves in-situ growth of layered bimetallic hydroxides intercalated with amino acid derivatives on the surface of carboxylated carbon nanotubes via a hydrothermal method, forming a core-shell structure. The layered structure and the intercalated amino acids or amino acid derivatives in this structure greatly improve the dispersibility of the filler in the matrix. Furthermore, the active functional groups extending from the amino acid derivative molecules can interact with the polymer molecular chains, thereby efficiently transferring external forces from the relatively fragile polymer matrix to the high-strength filler, achieving both increased stiffness and toughness.

[0097] In Examples 1 to 10, Example 1, which uses 2-aminoterephthalic acid, showed the best performance in ring stiffness. The mechanism may be that the molecule has a rigid aromatic ring structure, which can significantly expand the interlayer spacing like a pillar, and its dicarboxyl groups ensure strong intercalation between layers. This provides a strong rigid support network for the polymer matrix, thereby significantly improving the pipe's ability to resist external pressure deformation.

[0098] Example 11 (a combination of 2-aminoterephthalic acid and D-penicillamine) outperformed any single component, likely due to its synergistic effect. 2-Aminoterephthalic acid primarily provides the macroscopic rigid framework, while the highly reactive thiol and amino groups in the D-penicillamine molecule may act as molecular anchors, significantly enhancing the interfacial bonding between the filler and the matrix.

[0099] Example 14 introduces 3-amino-1,2,4-triazole-5-carboxylic acid based on Example 11, further improving its performance. The mechanism may lie in the introduction of a nitrogen-rich triazole heterocycle. This heterocycle not only further enhances the overall stiffness of the filler through its rigidity, but more importantly, the nitrogen atoms on the triazole ring can generate stronger coordination and hydrogen bonding interactions with polymer chains, metal stabilizers, etc., forming a denser and more stable three-dimensional cross-linked interface network.

Claims

1. A high-strength corrugated pipe for drainage, characterized in that, Includes the following components by weight: 50-75 parts PVC, 8-15 parts HPVC, 5-15 parts HNBR, 5-10 parts modified filler, 4-8 parts toughening agent, 1-2 parts antioxidant, 1-3 parts heat stabilizer, 0.4-1.1 parts lubricant; The modified filler is prepared as follows: Carboxylated carbon nanotubes were added to water to prepare a dispersion. After heating, divalent and trivalent metal nitrates were added and stirred to dissolve. The system was then cooled, and amino acid derivatives were added dropwise under a nitrogen atmosphere. The pH was adjusted using sodium hydroxide aqueous solution. The mixture was then reacted at high temperature. After the reaction was completed, the modified filler was obtained by filtration, washing, and drying. The amino acid derivative is composed of 2-aminoterephthalic acid and D-penicillamine in a mass ratio of 0.5-2:0.5-2.

2. The high-strength corrugated pipe for drainage as described in claim 1, characterized in that, The antioxidant is at least one of antioxidant 4010, antioxidant DPPD, or antioxidant DNP; the toughening agent is at least one of ethylene-octene copolymer and ethylene-propylene copolymer.

3. The high-strength corrugated pipe for drainage as described in claim 1, characterized in that, The lubricant is at least one of PE wax, EVA wax, calcium stearate, and ethylene distearate amine; the heat stabilizer is at least one of composite lead salt stabilizer, calcium zinc stabilizer, or organotin stabilizer.

4. The high-strength corrugated pipe for drainage as described in claim 1, characterized in that, The modified filler is prepared by the following method, in parts by weight: First, weigh out 3-8 parts of carboxylated carbon nanotubes, 3-8 parts of divalent metal nitrates, 1-5 parts of trivalent metal nitrates, and 1-5 parts of amino acid derivatives for later use. Add the carboxylated carbon nanotubes to water to prepare a dispersion of 2-6 mg / mL. Heat the solution to 70-90℃ and then add the divalent and trivalent metal nitrates, stirring until completely dissolved. Then, cool the system to 50-60℃ and add the amino acid derivative dropwise under a nitrogen atmosphere. Adjust the pH to 8-10 using a 1-4 mol / L sodium hydroxide aqueous solution. Transfer the mixture to a hydrothermal reactor and maintain the reaction at 80-90℃ for 5-20 hours. After the reaction is complete, filter, wash, and dry to obtain the modified filler.

5. The high-strength corrugated pipe for drainage as described in claim 1 or 4, characterized in that, The divalent metal nitrate is at least one of magnesium nitrate, zinc nitrate, and strontium nitrate; the trivalent metal nitrate is at least one of ferric nitrate and chromium nitrate.

6. The high-strength corrugated pipe for drainage as described in claim 1 or 4, characterized in that, The divalent metal nitrate is zinc nitrate; the trivalent metal nitrate is ferric nitrate.

7. The high-strength corrugated pipe for drainage as described in claim 1 or 4, characterized in that, The amino acid derivative may also be composed of 2-aminoterephthalic acid, D-penicillamine, and 3-amino-1,2,4-triazole-5-carboxylic acid in a mass ratio of 0.5-2:0.5-2:0.1-0.

3.

8. A method for manufacturing a high-strength corrugated pipe for drainage as described in any one of claims 1-7, characterized in that, The method is as follows: First, weigh out PVC, HPVC, HNBR, modified filler, toughening agent, antioxidant, heat stabilizer, and lubricant according to their weight proportions. Put all raw materials into a high-speed mixer and stir at a speed of 500-1000 r / min for 10-50 minutes. Then, feed the mixed material into a twin-screw extruder for plasticizing and extrusion molding. The set temperatures for each section of the extruder are as follows: feeding section 150-160℃, compression section 160-180℃, metering section 170-190℃, die head 180-190℃, and die 185-195℃. After the molten material is extruded through the die, it is blown into shape under compressed air at 0.12-0.18MPa and then put into a corrugated forming mold at 40-60℃ for shaping. Finally, it is pulled at a constant speed of 3-8 m / min by a traction machine and cut to a fixed length to obtain a high-strength corrugated pipe for drainage.