High-strength corrugated pipe for drainage and manufacturing method thereof

Abstract

The invention discloses a high-strength corrugated pipe for drainage and a manufacturing method thereof, and belongs to the technical field of corrugated pipes. The corrugated pipe comprises the following components in parts by weight: 50-75 parts of PVC, 8-15 parts of HPVC, 5-15 parts of HNBR, 5-10 parts of a modified filler, 4-8 parts of a toughening agent, 1-2 parts of an antioxidant, 1-3 parts of a heat stabilizer and 0.4-1.1 parts of a lubricant. The high-strength corrugated pipe for drainage is prepared by mixing the raw materials according to the formula at a high speed, then adopting a one-step continuous extrusion molding process, and carrying out plasticizing, extrusion, blow-up shaping and traction cutting under accurately controlled temperature parameters and blow-up pressure. Compared with the prior art, the high-strength corrugated pipe for drainage fundamentally solves the problems of poor filler dispersity and weak interface bonding through a multi-layer synergistic effect. Tests show that the corrugated pipe has high ring stiffness and excellent low-temperature impact resistance, is long in service life and is particularly suitable for high-standard drainage projects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of corrugated pipes, in particular to a high-strength corrugated pipe for drainage and a manufacturing method thereof. BACKGROUND

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

[0003] The prior art has made many explorations, for example, Chinese Patent Publication No. CN120156135A discloses a high-tensile-strength polytetrafluoroethylene (PTFE) film and a preparation process thereof. The technology prepares a composite material of epoxy-based tetrafluoroethylene copolymer and composite fillers, and then obtains the film through cold pressing and sintering processes. However, this technology is mainly aimed at PTFE film in a specific form, and its complex preparation process is difficult to apply to the manufacturing of large-diameter, continuous extrusion corrugated pipes, and the cost of PTFE raw materials is high, which cannot meet the economic requirements of drainage pipes.

[0004] Another Chinese Patent Publication No. CN120590725A directly relates to a low-temperature-resistant PVC corrugated pipe, which improves the low-temperature performance by introducing functional additives into a PVC / HPVC / HNBR system with a specific ratio. Although this technology focuses on the low-temperature resistance of the corrugated pipe, its core is to optimize the interfacial compatibility through ethylene-vinyl acetate copolymer grafting, and its reinforcing effect mainly depends on the toughening of the polymer, which has limited contribution to the improvement of the ring stiffness of the pipe, and does not solve the fundamental problem of poor filler dispersion and easy stress concentration under high filler content.

[0005] In summary, the existing technology has obvious limitations: either like CN120156135A, its material system and process do not match the low-cost and high-efficiency extrusion processing requirements of corrugated pipes; or like CN120590725A, its modification idea cannot simultaneously consider the high stiffness, high toughness and excellent long-term performance of the corrugated pipe, especially it fails to fundamentally solve the core contradiction of the dispersion and interfacial bonding force of the reinforcing filler in the polymer matrix. Therefore, developing a high-performance drainage corrugated pipe manufacturing technology that can achieve high strength, high toughness and balanced performance, and a feasible process, has become a problem to be solved in the field. SUMMARY

[0006] In order to solve the problems in the prior art, the present application aims to provide a high-strength corrugated pipe for drainage with significantly improved rigidity and toughness by using modified fillers with synergistic effect and a manufacturing method thereof.

[0007] In order to achieve the above-mentioned application purposes, the present application adopts the following technical solutions:

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

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

[0010] The preparation method of the modified fillers is as follows:

[0011] Carboxylated carbon nanotubes are added to water to configure a dispersion liquid, and after being heated, divalent metal nitrate and trivalent metal nitrate are added and stirred to dissolve; then the system is cooled, amino acid and / or amino acid derivative are added dropwise under a nitrogen atmosphere, and the pH is adjusted by using sodium hydroxide solution; the mixed system is reacted at high temperature; after the reaction is completed, the modified fillers are obtained through 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 bis-stearamide.

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

[0016] Preferably, the preparation method of the modified fillers is as follows, in terms of weight parts:

[0017] Firstly, 3-8 parts of carboxylated carbon nanotubes, 3-8 parts of divalent metal nitrate, 1-5 parts of trivalent metal nitrate and 1-5 parts of amino acid and / or amino acid derivative are weighed for use; the carboxylated carbon nanotubes are added into water to prepare a dispersion liquid with a concentration of 2-6 mg / mL, and then the divalent metal nitrate and the trivalent metal nitrate are added after the liquid is heated to 70-90 ℃ and stirred until completely dissolved; subsequently, the system is cooled to 50-60 ℃, and the amino acid and / or amino acid derivative is added dropwise under a nitrogen atmosphere, and the pH is adjusted to 8-10 by using 1-4 mol / L sodium hydroxide aqueous solution; the mixed system is transferred to a hydrothermal reaction kettle, and the reaction is maintained at 80-90 ℃ for 5-20 hours; after the reaction is completed, the product is obtained by filtration, washing and drying.

[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 iron nitrate and chromium nitrate.

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

[0021] The amino acid is at least one of glutamic acid, aspartic acid and cystine; and the amino acid derivative is at least one of D-penicillamine, 2-amino terephthalic acid, 2-methyl cysteine, p-aminobenzoic acid, 2,5-diaminobenzoic acid, carboxymethyl cysteine, 3-amino tetrahydrothiophene-3-carboxylic acid and 3-amino-1,2,4-triazole-5-carboxylic acid.

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

[0023] Further preferably, the amino acid derivative is composed of 2-amino terephthalic 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, the PVC, HPVC, HNBR, modified filler, toughening agent, antioxidant, heat stabilizer, lubricant are weighed by weight parts, all raw materials are put into a high-speed mixer, and stirred at a speed of 500-1000 r / min for 10-50 minutes, then the mixed material is sent into a double screw extruder for plasticizing and extruding, the setting temperature of each section of the extruder is respectively: 150-160℃ for feeding section, 160-180℃ for compression section, 170-190℃ for metering section, 180-190℃ for head, 185-195℃ for die, the molten material is extruded through the die, and is blown into a corrugated pipe under the action of 0.12-0.18 MPa compressed air, and is shaped into a corrugated pipe in a corrugated pipe shaping mold at 40-60℃, finally, the corrugated pipe is cut into a fixed length at a speed of 3-8 m / min by a traction machine, and a high-strength corrugated pipe for drainage is obtained.

[0026] The design of the present application starts from the deep insight into the core problem that the traditional filler has poor dispersibility in the polymer matrix and weak interfacial bonding. To solve this problem, a core-shell structure modified filler is conceived, which has carboxylated carbon nanotubes as the core and layered double hydroxide intercalated with amino acids or amino acid derivatives as the shell, aiming to improve the dispersion through the layered characteristics and achieve the preliminary bridging of the filler and the matrix by the functional groups of the amino acids or amino acid derivatives. Further, to break through the limitation of single interface modification, a synergistic system of multifunctional amino acids or amino acid derivatives is designed, first, 2-amino terephthalic acid is selected as a rigid skeleton support, then D-penicillamine is introduced to realize strong anchoring by its thiol group, and finally 3-amino-1, 2, 4-triazole-5-carboxylic acid is added to construct a stable three-dimensional interface network through the coordination of its heterocycle. Finally, the synchronous significant improvement of the rigidity and toughness of the drainage corrugated pipe is successfully realized.

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

[0028] 1) The present application constructs a stable reinforcing network in the matrix through the modified filler, which improves the ring stiffness of the pipe material and increases the low-temperature impact resistance, solving the industry problem that strength and toughness are difficult to be balanced.

[0029] 2) In the prior art, the filler is prone to agglomeration to form stress concentration points. In the present application, the carboxylated carbon nanotubes are in-situ grown on the surface by hydrothermal method, and are intercalated and bridged by amino acids or amino acid derivatives, so that the filler is uniformly dispersed at the nanoscale and forms a strong interfacial bonding with the PVC, HNBR and other matrices. The performance defects caused by agglomeration are eliminated, and the performance potential of the material is fully utilized, and the performance is uniform and stable.

[0030] 3) The corrugated pipe prepared by the application not only has excellent instantaneous mechanical properties, but also has excellent creep resistance, heat aging resistance and dimensional stability due to the compact interface structure and the stability of the filler itself. This makes the pipe stable in performance under harsh environments such as long-term load and temperature change, significantly prolongs the service life, and is suitable for deep buried drainage, industrial drainage and other more demanding scenarios. DETAILED DESCRIPTION

[0031] Part of the material parameters and sources:

[0032] PVC, brand: OxyVinyls® 226, brand: American Western Petroleum Ethylene Company.

[0033] HPVC, brand: 8001, brand: Taiwan Plastic.

[0034] HNBR, product name: Zetpol® 1010, brand: Japan Zeon.

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

[0036] Calcium-zinc stabilizer, part number: ADK STAB RUP-129, brand: Japan ADEKA.

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

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

[0039] The remaining raw materials in the examples and comparative examples of the application are commercially available products.

[0040] Example 1

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

[0042] First, 65 parts of PVC, 12 parts of HPVC, 10 parts of HNBR, 8 parts of modified filler, 6 parts of ethylene-octene copolymer, 1.8 parts of antioxidant 4010, 2 parts of calcium-zinc stabilizer, 0.2 parts of PE wax and 0.5 parts of calcium stearate are weighed, all the raw materials are put into a high-speed mixer, stirred at a speed of 800 r / min for 30 minutes, then the mixed material is sent into a double screw extruder for plasticizing and extruding, the setting temperature of each section of the extruder is respectively: 155℃ for feeding section, 170℃ for compression section, 180℃ for metering section, 185℃ for head, 190℃ for die, the molten material is extruded through the die, and is blow molded under the pressure of 0.15 MPa of compressed air, and enters the corrugated forming mold at 50℃ for setting, finally, the high-strength corrugated pipe for drainage is obtained by uniform traction at a speed of 5 meters / minute through a traction machine and cutting according to the fixed length.

[0043] The preparation method of the modified filler is as follows, in parts by weight:

[0044] First, 5 parts of carboxylated carbon nanotubes, 5 parts of divalent metal nitrate, 3 parts of trivalent metal nitrate and 3 parts of amino acid derivative are weighed for use; the carboxylated carbon nanotubes are added to water to prepare a dispersion liquid of 4 mg / mL, and then the divalent metal nitrate and the trivalent metal nitrate are added after being heated to 80℃ and stirred until completely dissolved; then the system is cooled to 55℃, and the amino acid derivative is added dropwise under a nitrogen atmosphere, and the pH is adjusted to 9 by using 3 mol / L sodium hydroxide aqueous solution; the mixed system is transferred to a hydrothermal reaction kettle, and the reaction is maintained at 90℃ for 15 hours; after the reaction is completed, the product is obtained by filtration, washing and drying.

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

[0046] Example 2

[0047] The manufacturing method of a high-strength drainage corrugated pipe is basically the same as that of Example 1, with the only difference being 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 drainage corrugated pipe is basically the same as that of Example 1, with the only difference being 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 drainage corrugated pipe is basically the same as that of Example 1, with the only difference being that the amino acid derivative in the preparation method of the modified filler is 2-methyl cysteine.

[0052] Example 5

[0053] The manufacturing method of a high-strength drainage corrugated pipe is basically the same as that of Example 1, with the only difference being that the amino acid derivative in the preparation method of the modified filler is carboxymethyl cysteine.

[0054] Example 6

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

[0056] Example 7

[0057] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that of example 1, with the only difference that the amino acid derivative in the preparation method of the modified filler is replaced by an amino acid, specifically glutamic acid.

[0058] Example 8

[0059] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that of example 1, with the only difference that the amino acid derivative in the preparation method of the modified filler is replaced by an amino acid, specifically glutamic acid.

[0060] Example 9

[0061] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that of example 1, with the only difference that the amino acid derivative in the preparation method of the modified filler is replaced by an amino acid, specifically aspartic acid.

[0062] Example 10

[0063] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that of example 1, with the only difference that the amino acid derivative in the preparation method of the modified filler is replaced by an amino acid, specifically cystine.

[0064] Example 11

[0065] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that of example 1, with the only difference that the amino acid derivative in the preparation method of the modified filler is 2-amino terephthalic acid and D-penicillamine in a mass ratio of 1:1.

[0066] Example 12

[0067] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that of example 1, with the only difference that the amino acid derivative in the preparation method of the modified filler is replaced by an amino acid, specifically glutamic acid and aspartic acid in a mass ratio of 1:1.

[0068] Example 13

[0069] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that of example 1, with the only difference that the amino acid derivative in the preparation method of the modified filler is replaced by a mixture of an amino acid and an amino acid derivative, specifically cystine and p-aminobenzoic acid in a mass ratio of 1:1.

[0070] Example 14

[0071] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that in embodiment 1, with the only difference that the amino acid derivative in the preparation method of the modified filler is replaced by amino acids, specifically cysteine.

[0072] Comparative example 1

[0073] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that in embodiment 1, with the only difference that the amino acid derivative in the preparation method of the modified filler is replaced by amino acids, specifically cysteine.

[0074] Comparative example 2

[0075] A manufacturing method of a high-strength drainage corrugated pipe is basically the same as that in embodiment 1, with the only difference that the divalent metal nitrate in the preparation method of the modified filler is replaced by calcium nitrate; and the trivalent metal nitrate is replaced by aluminum nitrate.

[0076] Comparative example 3

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

[0078] Test example 1

[0079] Test of ring stiffness

[0080] The test 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 vertically compressed at a constant speed by the upper and lower compression plates until a radial deformation of at least 30% is produced. By continuously recording the force value and deformation, the ring stiffness of the pipe is calculated.

[0082] The test method is as follows: One 200±10mm long sample is cut from each of three pipes. The sample is conditioned in an environment of 23±2℃ for 24 hours. The sample is placed in the center of the compression plate of the testing machine and compressed at a rate of 5±1mm / min.

[0083] Data processing: The ring stiffness (S) is 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 samples.

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

[0085] Table 1

[0086] Experimental protocol Ring stiffness (kN / m 2 )]> 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] Test of impact resistance

[0089] The impact resistance at 0℃ was tested according to GB / T 14152-2001 “Test method for resistance to external impact of thermoplastics pipes - Pendulum method”.

[0090] Test principle: The pipe sample was placed horizontally on the impact testing machine, and a specified mass of a falling hammer was allowed to fall freely from a certain height. The impact number at which the sample produced a dent was recorded to evaluate its impact resistance. The higher the impact number, the better the impact resistance.

[0091] A sufficient number of (200±10) mm long samples were cut from the pipe. The sample was soaked in a low-temperature water bath at 0±1℃ for 2 hours.

[0092] Impact test: The sample after state adjustment was quickly placed on the testing machine within 10 seconds, the d90 hammer was used, the impact height was 2000mm, the mass of the falling hammer was 1.6kg, the sample was impacted, and the impact number at which the sample produced a dent was recorded.

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

[0094] Table 2

[0095] Experimental protocol Number of impacts 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 performance of the high-strength corrugated pipe for drainage according to the present application, examples 1 to 10, is significantly better than that of comparative example 3, and the fundamental reason may be that comparative example 3 only uses unmodified carboxylated carbon nanotubes, which are prone to agglomeration in the polymer matrix, forming stress concentration points, and the interface bonding with the matrix is weak. The modified filler prepared by the present application is a core-shell structure formed by in-situ growth of layered double hydroxide intercalated with amino acid derivative on the surface of carboxylated carbon nanotubes by hydrothermal method. The layered structure and the intercalated amino acid or amino acid derivative in the structure greatly improve the dispersibility of the filler in the matrix, and the active functional groups of the amino acid derivative molecules can interact with the polymer molecular chain, thereby efficiently transferring external force from the relatively fragile polymer matrix to the high-strength filler, achieving the effect of simultaneously increasing rigidity and toughness.

[0097] In Examples 1-10, Example 1 using 2-amino terephthalic acid performed the best in terms of ring stiffness, the mechanism of which can be that this molecule has a rigid aromatic ring structure that can significantly expand the interlayer spacing like a pillar, and its double carboxyl group ensures firm intercalation between the layers, which provides a strong and rigid support network for the polymer matrix, thereby significantly improving the ability of the pipe to resist external pressure deformation.

[0098] The performance of Example 11 (2-amino terephthalic acid compounded with D-penicillamine) is better than any single component, the key of which can be the synergistic effect. 2-amino terephthalic acid mainly provides a macroscopic rigid skeleton, while the high activity of the thiol and amino groups contained in the D-penicillamine molecule can greatly enhance the interfacial bonding force between the filler and the matrix like a molecular anchor.

[0099] Example 14 introduces 3-amino-1,2,4-triazole-5-carboxylic acid on the basis of Example 11, and its performance is further improved, the mechanism of which can be that this substance introduces a triazole heterocycle rich in nitrogen atoms. This heterocycle not only further improves the overall stiffness of the filler through its rigidity, but more importantly, the nitrogen atoms on the triazole ring can form stronger coordination and hydrogen bonding with the polymer chain, metal stabilizer, etc., forming a more dense and 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 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.

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 acids and their derivatives. 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 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, 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 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.

8. The high-strength corrugated pipe for drainage as described in claim 1 or 4, characterized in that, The amino acid derivative is composed of 2-aminoterephthalic acid and D-penicillamine in a mass ratio of 0.5-2:0.5-2.

9. The high-strength corrugated pipe for drainage as described in claim 1 or 4, characterized in that, 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.

10. A method for manufacturing a high-strength corrugated pipe for drainage as described in any one of claims 1-9, 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.