Enhanced HDPE (high-density polyethylene) double-wall corrugated pipe and manufacturing method thereof

Abstract

The invention discloses an enhanced HDPE (high-density polyethylene) double-wall corrugated pipe and a manufacturing method thereof, and belongs to the technical field of corrugated pipes. Through unique corrugation design and an independently researched and developed production process, key raw materials comprise HDPE powder, kaolin, POE (polyolefin elastomer), a modified reinforcing agent and the like, and the product quality is ensured by accurately controlling stirring, extruding and cooling processes. Compared with the prior art, the pipe provided by the invention is excellent in notch impact strength, pressure resistance, flexibility, dimensional accuracy and corrosion resistance, meets the application requirements of large-diameter pipelines, fills up the market blank, and has remarkable economic and environmental benefits.

Description

Technical Field

[0001] The invention relates to the technical field of corrugated pipes, and in particular to a reinforced HDPE double-wall corrugated pipe and a manufacturing method thereof. Background Art

[0002] With the acceleration of urbanization and the continuous deepening of infrastructure construction, the demand for high-quality pipeline systems is growing. Among the many pipeline materials, high-density polyethylene (HDPE) double-wall corrugated pipe has attracted widespread attention due to its excellent performance and economic benefits. HDPE double-wall corrugated pipe plays an important role in municipal engineering, sewage treatment, water conservancy engineering and other fields with its unique structural design and material properties.

[0003] HDPE double-wall corrugated pipe is a new type of pipe with an annular corrugated structure. It has been widely used in domestic and foreign markets for its light weight, high strength, good flexibility and corrosion resistance. Traditional HDPE double-wall corrugated pipe is mainly produced by co-extrusion process, with smooth inner wall and corrugated outer wall, which is conducive to improving the ring stiffness and ring flexibility of the pipe, thereby enhancing its pressure bearing capacity and ability to adapt to different soil environments.

[0004] Although HDPE double-wall corrugated pipes perform well in many aspects, existing technologies still have certain limitations in some special applications, such as the need for large-diameter pipes, adaptability to complex installation environments, and requirements for higher corrosion resistance. In addition, with the improvement of environmental protection requirements, the market demand for new environmentally friendly pipe materials is also increasing.

[0005] In China, the production technology of HDPE double-wall corrugated pipes is relatively mature, but most companies' products still have certain gaps in key indicators such as ring stiffness and ring flexibility. In addition, the production technology of large-diameter HDPE double-wall corrugated pipes has not yet been popularized in China, and there is a certain technical gap in the production of large-diameter HDPE double-wall corrugated pipes.

[0006] Chinese invention patent CN116790058A discloses a HDPE double-wall corrugated pipe and its preparation method, which belongs to the field of corrugated pipe technology, including the following raw materials by weight: 100 parts of high-density polyethylene, 10-14 parts of modified carbon nanotubes, 6-10 parts of functionalized nano titanium dioxide, 25-35 parts of POE elastomer, 1-2 parts of lubricant, 0.6-0.8 parts of benzoyl peroxide; the raw materials are stirred and mixed evenly, sent to a twin-screw extruder, melt extruded, molded, and then pulled, cut, and expanded to obtain a double-wall corrugated pipe. The double-wall corrugated pipe of the invention uses HDPE as the matrix, and adds modified carbon nanotubes and functionalized nano titanium dioxide as reinforcing materials to improve the mechanical strength and water resistance and corrosion resistance of the corrugated pipe; the modified carbon nanotubes can also interact with the functionalized nano titanium dioxide, which can make the two better play a reinforcing role and improve the ring stiffness and aging resistance of the corrugated pipe. However, the notched impact strength and light aging resistance of the HDPE double-wall corrugated pipe prepared by the invention are poor, and cannot meet the application requirements of large-diameter HDPE double-wall corrugated pipes. Summary of the invention

[0007] In view of the limitations of the prior art, the present invention aims to provide a reinforced HDPE double-wall corrugated pipe and a method for manufacturing the same. The method significantly improves the ring stiffness, ring flexibility, notch impact strength and light aging resistance of the pipe by introducing modified reinforcing agents and specific additives to meet the needs of large-diameter pipeline applications and adaptability to complex environments.

[0008] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0009] A method for manufacturing a reinforced HDPE double-wall corrugated pipe is as follows, in parts by weight:

[0010] Add 80-120 parts of HDPE powder, 10-20 parts of kaolin, 8-12 parts of POE elastomer, 10-20 parts of modifier, 1-2 parts of lubricant, 5-10 parts of toughening agent, 0.2-0.4 parts of antioxidant, and 2-4 parts of black masterbatch into a high-speed mixer, set the rotation speed to 400-600 r / min, stir for 1-5 minutes to obtain a premix; place the premix into a twin-screw extruder, and set the extrusion parameters as follows: extrusion temperature 160-180° C.; extruder speed 40-60 r / min; traction speed 300-500 cm / min; obtain a preliminary HDPE pipe after extrusion; place the extruded preliminary pipe in a water temperature environment of 0.01-0.03 MPa and 20-25° C. for shaping; then transfer it to a water tank of 15-20° C. for secondary cooling; cut the product after secondary cooling to a fixed length to obtain a reinforced HDPE double-wall corrugated pipe.

[0011] The toughening agent is at least one of SBS, SEBS and EPDM.

[0012] The lubricant is at least one of white oil, calcium stearate, zinc stearate and stearic acid.

[0013] The antioxidant is at least one of dilauryl thiodipropionate, (2,4-di-tert-butylphenyl) phosphite triester, and β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate octadecyl alcohol.

[0014] The preparation method of the modified enhancer is as follows, in parts by weight:

[0015] First, 80-120 parts of sodium persulfate, 80-120 parts of dithiothreitol, 600-900 parts of emulsifier, 100-140 parts of silicone defoamer and 1.2×10 5 ~1.8×10 5 100-2000 parts of cis-octadecatonic acid and 4×10 3 ~6×10 3 1×10 3 ~1.5×10 3 Garcinia acid and 1.5×10 4 ~2.5×10 4 The functional mixture is added to the initial reactant, and ethylene gas is continuously introduced to treat for 5 to 10 hours; after the treatment, the pH value is adjusted to 8 to 11 using a pH regulator, and then cooled and filtered to obtain a modified enhancer.

[0016] The emulsifier is at least one of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, diethylene glycol monoethyl ether, propylene glycol monocaprylate, sorbitan monooleate, and sodium lauryl sulfate.

[0017] The organosilicon defoamer is at least one of BYK-038, BYK-037 and BYK-1616.

[0018] The pH regulator is a 0.4-0.6 mol / / L sodium hydroxide aqueous solution.

[0019] The functions of the various substances described in the present invention are as follows:

[0020] HDPE powder is the main raw material for reinforced HDPE double-wall corrugated pipe, providing the basic structure and strength of the pipe.

[0021] Kaolin is used as filler to improve the rigidity and dimensional stability of pipes and reduce costs.

[0022] POE elastomer improves the flexibility and elasticity of the pipe and improves its impact resistance.

[0023] Modified reinforcing agents improve the mechanical properties and aging resistance of pipes.

[0024] Lubricants include white oil, calcium stearate, zinc stearate, stearic acid, etc., which can reduce friction during the extrusion process and improve extrusion efficiency.

[0025] Toughening agents such as SBS, SEBS and EPDM enhance the toughness and impact resistance of pipes.

[0026] Antioxidants prevent material oxidation and extend the service life of the pipe.

[0027] Black masterbatch is used to adjust the color of the tubing and may also provide some UV resistance.

[0028] Sodium persulfate acts as a polymerization initiator to promote the polymerization reaction of the modified enhancer.

[0029] Dithiothreitol, as a reducing agent, may be used to control free radicals during the polymerization process.

[0030] Emulsifiers are used in the preparation of modified enhancers to improve the dispersibility and stability of modified enhancers.

[0031] Silicone defoamers are used to eliminate foam generated during the preparation of modified reinforcing agents.

[0032] The pH adjuster is used to adjust the pH value of the modified enhancer to ensure the stability and functionality of the modified enhancer.

[0033] In the preparation of modified enhancers, cis-octadecatetraenoic acid and gambogic acid may be used to provide conjugated double bonds and other functional groups to enhance the photostability and anti-aging properties of the modified enhancers.

[0034] The synergistic effect of these substances enables the reinforced HDPE double-wall corrugated pipe of the present invention to have excellent mechanical properties, aging resistance and environmental adaptability.

[0035] Compared with the prior art, it has the following beneficial effects:

[0036] 1) The present invention significantly improves the ring stiffness, ring flexibility and notch impact strength of the HDPE double-wall corrugated pipe by introducing a modifier and a variety of additives, so that the pipe exhibits better stability and durability when subjected to external pressure and impact.

[0037] 2) By adding specific antioxidants and light stabilizers, the HDPE double-wall corrugated pipe of the present invention shows a lower performance degradation rate in the light aging test, which means that the pipe can better resist aging and performance degradation caused by ultraviolet rays during long-term use, especially in outdoor environments.

[0038] 3) The pipeline design of the present invention takes into account a variety of complex environmental conditions. By optimizing the material formula and production process, the pipeline has better chemical corrosion resistance and temperature adaptability, and is suitable for a wider range of application scenarios, including extreme temperatures and environments with complex chemical properties. DETAILED DESCRIPTION

[0039] Main sources of substances:

[0040] HDPE powder, brand: 5000S, processing level: extrusion grade, drawing grade, brand: Daqing Petrochemical.

[0041] Kaolin, specification: 3000 mesh, Mohs hardness: 6-7, appearance: white powder.

[0042] POE elastomer, item number: DF810, brand: Mitsui Chemicals.

[0043] SBS, brand: YH-815, processing level: extrusion grade, manufacturer: Baling Petrochemical.

[0044] Black masterbatch, item number: HE106, color: black, Suzhou Linyuan Plastic Technology Co., Ltd.

[0045] Isomeric tridecanol polyoxyethylene ether ammonium sulfate, type: emulsifier, model E-1310SA, Hai'an Petrochemical Plant, Jiangsu Province.

[0046] The remaining raw materials in the examples and comparative examples of the present invention are all commercially available products.

[0047] The design idea of ​​the present invention is to innovate the raw material formula and manufacturing process of HDPE double-wall corrugated pipe, introduce modified enhancers and specific additives to improve the ring stiffness, ring flexibility, notch impact strength and light aging resistance of the pipe, thereby producing enhanced HDPE double-wall corrugated pipe with better performance, more stable size and better corrosion resistance, which meets the needs of large-diameter pipeline applications and adaptability to complex environments.

[0048] Example 1

[0049] A method for manufacturing an enhanced HDPE double-wall corrugated pipe is as follows:

[0050] Add 100kg HDPE powder, 15kg kaolin, 10kg POE elastomer, 15kg modifier, 1.5kg zinc stearate, 8kg SBS, 0.3kg dilauryl thiodipropionate, and 3kg black masterbatch into a high-speed mixer, set the speed to 500r / min, and stir for 3 minutes to obtain a premix; place the premix into a twin-screw extruder, and set the extrusion parameters: extrusion temperature 170°C; extruder speed 50r / min; traction speed 400cm / min; obtain a preliminary HDPE pipe after extrusion; place the extruded preliminary pipe in a water temperature environment of 0.02MPa and 23°C for shaping; then transfer it to a water tank at 18°C ​​for secondary cooling; cut the product after secondary cooling to a fixed length to obtain a reinforced HDPE double-wall corrugated pipe.

[0051] The preparation method of the modified enhancer is as follows:

[0052] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, 120g of silicone defoamer BYK-038 and 150kg of water are mixed and heated to 90°C to obtain a reaction system; then, 0.3kg of cis-octadecatetraenoic acid and 5kg of vinyl acetate are pre-mixed to obtain a premix, and the premix is ​​added to the reaction system, and after vacuuming and introducing ethylene gas, it is treated for 40 minutes to obtain an initial reactant; then the temperature is raised to 95°C, 1.2kg of gambogic acid and 20kg of vinyl acetate are mixed to obtain a functional mixture, the functional mixture is added to the initial reactant, and ethylene gas is continuously introduced for treatment for 8 hours; after the treatment, the pH value is adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0053] Example 2

[0054] The method for manufacturing a reinforced HDPE double-wall corrugated pipe is basically the same as that in Example 1, the only difference being the preparation method of the modified reinforcing agent.

[0055] The preparation method of the modified enhancer is as follows:

[0056] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, 120g of silicone defoamer BYK-038 and 150kg of water were mixed and heated to 90°C to obtain a reaction system; then, 0.3kg of 9-hydroxy-10,12-octadecadienoic acid and 5kg of vinyl acetate were pre-mixed to obtain a premix, and the premix was added to the reaction system, and after vacuuming and introducing ethylene gas, it was treated for 40 minutes to obtain an initial reactant; then the temperature was raised to 95°C, 1.2kg of gambogic acid and 20kg of vinyl acetate were mixed to obtain a functional mixture, the functional mixture was added to the initial reactant, and ethylene gas was continuously introduced for treatment for 8 hours; after the treatment, the pH value was adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0057] Example 3

[0058] The method for manufacturing a reinforced HDPE double-wall corrugated pipe is basically the same as that in Example 1, the only difference being the preparation method of the modified reinforcing agent.

[0059] The preparation method of the modified enhancer is as follows:

[0060] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, 120g of silicone defoamer BYK-038 and 150kg of water are mixed and heated to 90°C to obtain a reaction system; then, 0.3kg of fumaric acid and 5kg of vinyl acetate are pre-mixed to obtain a premix, and the premix is ​​added to the reaction system, and after vacuuming and introducing ethylene gas, it is treated for 40 minutes to obtain an initial reactant; then the temperature is raised to 95°C, 1.2kg of gambogic acid and 20kg of vinyl acetate are mixed to obtain a functional mixture, the functional mixture is added to the initial reactant, and ethylene gas is continuously introduced for treatment for 8 hours; after the treatment, the pH value is adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0061] Example 4

[0062] The method for manufacturing a reinforced HDPE double-wall corrugated pipe is basically the same as that in Example 1, the only difference being the preparation method of the modified reinforcing agent.

[0063] The preparation method of the modified enhancer is as follows:

[0064] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, 120g of silicone defoamer BYK-038 and 150kg of water were mixed and heated to 90°C to obtain a reaction system; then, 0.3kg of 5-phenyl-2,4-pentadienoic acid and 5kg of vinyl acetate were pre-mixed to obtain a premix, and the premix was added to the reaction system, and after vacuuming and introducing ethylene gas, it was treated for 40 minutes to obtain an initial reactant; then the temperature was raised to 95°C, 1.2kg of gambogic acid and 20kg of vinyl acetate were mixed to obtain a functional mixture, the functional mixture was added to the initial reactant, and ethylene gas was continuously introduced for treatment for 8 hours; after the treatment, the pH value was adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0065] Example 5

[0066] The method for manufacturing a reinforced HDPE double-wall corrugated pipe is basically the same as that in Example 1, the only difference being the preparation method of the modified reinforcing agent.

[0067] The preparation method of the modified enhancer is as follows:

[0068] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, 120g of silicone defoamer BYK-038 and 150kg of water are mixed and heated to 90°C to obtain a reaction system; then, 0.3kg of conjugated linoleic acid and 5kg of vinyl acetate are pre-mixed to obtain a premix, and the premix is ​​added to the reaction system, and after vacuuming and introducing ethylene gas, it is treated for 40 minutes to obtain an initial reactant; then the temperature is raised to 95°C, 1.2kg of gambogic acid and 20kg of vinyl acetate are mixed to obtain a functional mixture, the functional mixture is added to the initial reactant, and ethylene gas is continuously introduced for treatment for 8 hours; after the treatment, the pH value is adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0069] Example 6

[0070] The method for manufacturing a reinforced HDPE double-wall corrugated pipe is basically the same as that in Example 1, the only difference being the preparation method of the modified reinforcing agent.

[0071] The preparation method of the modified enhancer is as follows:

[0072] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecyl alcohol polyoxyethylene ether ammonium sulfate, 120g of silicone defoamer BYK-038 and 150kg of water are mixed and heated to 90°C to obtain a reaction system; then, 0.3kg of gambogic acid and 5kg of vinyl acetate are pre-mixed to obtain a premix, and the premix is ​​added to the reaction system, and after vacuuming and introducing ethylene gas, it is treated for 40 minutes to obtain an initial reactant; then the temperature is raised to 95°C, 1.2kg of gambogic acid and 20kg of vinyl acetate are mixed to obtain a functional mixture, the functional mixture is added to the initial reactant, and ethylene gas is continuously introduced for treatment for 8 hours; after the treatment, the pH value is adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0073] Example 7

[0074] The method for manufacturing a reinforced HDPE double-wall corrugated pipe is basically the same as that in Example 1, the only difference being the preparation method of the modified reinforcing agent.

[0075] The preparation method of the modified enhancer is as follows:

[0076] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecyl alcohol polyoxyethylene ether sulfate ammonium salt, 120g of silicone defoamer BYK-038 and 150kg of water are mixed and heated to 90°C to obtain a reaction system; then, 0.3kg of cis-octadecatetraenoic acid and 5kg of vinyl acetate are pre-mixed to obtain a premix, and the premix is ​​added to the reaction system, and after vacuuming and introducing ethylene gas, it is treated for 40 minutes to obtain an initial reactant; then the temperature is raised to 95°C, 1.2kg of cis-octadecatetraenoic acid and 20kg of vinyl acetate are mixed to obtain a functional mixture, the functional mixture is added to the initial reactant, and ethylene gas is continuously introduced for 8 hours; after the treatment, the pH value is adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0077] Comparative Example 1

[0078] The method for manufacturing a reinforced HDPE double-wall corrugated pipe is basically the same as that in Example 1, the only difference being the preparation method of the modified reinforcing agent.

[0079] The preparation method of the modified enhancer is as follows:

[0080] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, 120g of silicone defoamer BYK-038 and 150kg of water are mixed and heated to 90°C to obtain a reaction system; then, 0.3kg of eleostearic acid and 5kg of vinyl acetate are pre-mixed to obtain a premix, and the premix is ​​added to the reaction system, and after vacuuming and introducing ethylene gas, it is treated for 40 minutes to obtain an initial reactant; then the temperature is raised to 95°C, 1.2kg of gambogic acid and 20kg of vinyl acetate are mixed to obtain a functional mixture, the functional mixture is added to the initial reactant, and ethylene gas is continuously introduced for treatment for 8 hours; after the treatment, the pH value is adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0081] Comparative Example 2

[0082] The method for manufacturing a reinforced HDPE double-wall corrugated pipe is basically the same as that in Example 1, the only difference being the preparation method of the modified reinforcing agent.

[0083] The preparation method of the modified enhancer is as follows:

[0084] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, 120g of silicone defoamer BYK-038 and 150kg of water are mixed and heated to 90°C to obtain a reaction system; then, 0.3kg of eleostearic acid and 5kg of vinyl acetate are pre-mixed to obtain a premix, and the premix is ​​added to the reaction system, and after vacuuming and introducing ethylene gas, it is treated for 40 minutes to obtain an initial reactant; then the temperature is raised to 95°C, 1.2kg of eleostearic acid and 20kg of vinyl acetate are mixed to obtain a functional mixture, the functional mixture is added to the initial reactant, and ethylene gas is continuously introduced for treatment for 8 hours; after the treatment, the pH value is adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0085] Comparative Example 3

[0086] The method for manufacturing a reinforced HDPE double-wall corrugated pipe is basically the same as that in Example 1, the only difference being the preparation method of the modified reinforcing agent.

[0087] The preparation method of the modified enhancer is as follows:

[0088] First, 100g of sodium persulfate, 100g of dithiothreitol, 800g of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, 120g of silicone defoamer BYK-038 and 150kg of water were mixed and heated to 90°C to obtain a reaction system; then, 5kg of vinyl acetate was added to the reaction system, and after vacuuming and introducing ethylene gas, it was treated for 40 minutes to obtain an initial reactant; then the temperature was raised to 95°C, 20kg of vinyl acetate was added to the initial reactant, and ethylene gas was continuously introduced for 8 hours; after the treatment, the pH value was adjusted to 10 using a 0.5mol / / L sodium hydroxide aqueous solution, and then cooled and filtered to obtain a modified enhancer.

[0089] Comparative Example 4

[0090] A method for manufacturing an enhanced HDPE double-wall corrugated pipe is as follows:

[0091] Add 100kg HDPE powder, 15kg kaolin, 10kg POE elastomer, 1.5kg zinc stearate, 8kg SBS, 0.3kg dilauryl thiodipropionate, and 3kg black masterbatch into a high-speed mixer, set the speed to 500r / min, and stir for 3 minutes to obtain a premix; place the premix into a twin-screw extruder, and set the extrusion parameters: extrusion temperature 170°C; extruder speed 50r / min; traction speed 400cm / min; obtain a preliminary HDPE pipe after extrusion; place the extruded preliminary pipe in a water temperature environment of 0.02MPa and 23°C for shaping; then transfer it to a water tank at 18°C ​​for secondary cooling; cut the product after secondary cooling to a fixed length to obtain a reinforced HDPE double-wall corrugated pipe.

[0092] Test Example 1

[0093] Notched impact strength test

[0094] According to the national standard GB / T 1043.1-2008 “Determination of impact properties of simply supported beams of plastics Part 1: Non-instrumented impact test”, the reinforced HDPE double-wall corrugated pipes of the embodiments of the present invention and the comparative examples were tested, and the test data are shown in Table 1.

[0095] Table 1

[0096] Experimental protocol <![CDATA[Notched impact strength (kJ·m -2 )]]> Example 1 29.4 Example 2 27.6 Example 3 28.2 Example 4 27.8 Example 5 27.1 Example 6 28.1 Example 7 26.8 Comparative Example 1 27.3 Comparative Example 2 26.5 Comparative Example 3 25.6 Comparative Example 4 23.4

[0097] Test Example 2

[0098] Light aging test

[0099] The test was carried out in accordance with GB / T 16422.2-2022 "Plastics Laboratory Light Source Exposure Test Method Part 2: Xenon Arc Lamp" standard, with an average irradiance of 0.5W / m 2The light aging test was carried out for 1000 h. After aging, the samples were air-dried at room temperature for 24 h, and their ring stiffness before and after aging was tested. The test results are shown in Table 2.

[0100] Table 2

[0101]

[0102]

[0103] It can be seen from the data in Tables 1 and 2 that the reinforced HDPE double-wall corrugated pipe prepared in Example 1 has the largest notched impact strength and the best performance after light aging.

[0104] In the present invention, the introduction of cis-octadecatonic acid improves the performance of the HDPE double-wall corrugated pipe mainly through its conjugated double bond structure compared to the different organic acids in other embodiments and comparative examples. Cis-octadecatonic acid contains multiple double bonds, which makes it have a high reactivity in the polymerization reaction, and can effectively react with vinyl acetate and ethylene to form a stable copolymer, thereby enhancing the toughness and impact resistance of the material. In addition, the high reactivity of cis-octadecatonic acid to form a stable copolymer may also improve the light stability of the material, reduce the damage of ultraviolet rays to HDPE, and delay the light aging process.

[0105] Cis-octadecatetraenoic acid contains four double bonds. This highly unsaturated fatty acid can provide good flexibility and impact resistance. Garcinia acid contains multiple carbon-carbon double bonds, as well as functional groups such as carbonyl, hydroxyl, carbon-oxygen bond, and carbon-hydrogen bond. These functional groups can interact with the molecular chain to enhance the intermolecular connection force, thereby improving the mechanical properties and aging resistance of the pipe. The functional groups in Garcinia acid may also participate in photostabilization, further enhancing the light aging resistance of the material. When cis-octadecatetraenoic acid and Garcinia acid are used in combination, their respective advantages are complementary. The flexibility and impact resistance provided by cis-octadecatetraenoic acid are combined with the intermolecular forces and light stability enhanced by the functional groups in Garcinia acid, making the overall effect of the modified enhancer more significant. This combination not only improves the notched impact strength of the pipe, but also maintains good performance during the light aging process, reducing the performance degradation caused by aging. Therefore, the combined use of cis-octadecatetraenoic acid and gambogic acid in Example 1 can more effectively improve the comprehensive performance of the reinforced HDPE double-wall corrugated pipe than using either one alone.

Claims

1. A method for manufacturing a reinforced HDPE double-wall corrugated pipe, characterized in that: The method is as follows, in parts by weight: 80-120 parts of HDPE powder, 10-20 parts of kaolin, 8-12 parts of POE elastomer, 10-20 parts of modifier, 1-2 parts of lubricant, 5-10 parts of toughening agent, 0.2-0.4 parts of antioxidant and 2-4 parts of black masterbatch are mixed, the rotation speed is set to 400-600 r / min, and stirring is performed for 1-5 minutes to obtain a premix; the premix is ​​placed in a twin-screw extruder, and the extrusion parameters are set as follows: extrusion temperature 160-180°C; extruder speed 40-60 r / min; traction speed 300-500 cm / min; a preliminary HDPE pipe is obtained after extrusion; the extruded preliminary pipe is placed in a water temperature environment of 0.01-0.03 MPa and 20-25°C for shaping; then it is transferred to a water tank of 15-20°C for secondary cooling; the product after secondary cooling is cut to a fixed length to obtain a reinforced HDPE double-wall corrugated pipe.

2. The method for manufacturing the reinforced HDPE double-wall corrugated pipe according to claim 1, characterized in that: The toughening agent is at least one of SBS, SEBS and EPDM.

3. The method for manufacturing the reinforced HDPE double-wall corrugated pipe according to claim 1, characterized in that: The lubricant is at least one of white oil, calcium stearate, zinc stearate and stearic acid.

4. The method for manufacturing the reinforced HDPE double-wall corrugated pipe according to claim 1, characterized in that: The antioxidant is at least one of dilauryl thiodipropionate, (2,4-di-tert-butylphenyl) phosphite triester, and β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate octadecyl alcohol.

5. The method for manufacturing the reinforced HDPE double-wall corrugated pipe according to claim 1, characterized in that: The preparation method of the modified enhancer is as follows, in parts by weight: First, 80-120 parts of sodium persulfate, 80-120 parts of dithiothreitol, 600-900 parts of emulsifier, 100-140 parts of silicone defoamer and 1.2×10 5 ~1.8×10 5 100-2000 parts of cis-octadecatonic acid and 4×10 3 ~6×10 3 1×10 3 ~1.5×10 3 Garcinia acid and 1.5×10 4 ~2.5×10 4 The functional mixture is added to the initial reactant, and ethylene gas is continuously introduced to treat for 5 to 10 hours; after the treatment, the pH value is adjusted to 8 to 11 using a pH regulator, and then cooled and filtered to obtain a modified enhancer.

6. The method for manufacturing the reinforced HDPE double-wall corrugated pipe according to claim 5, characterized in that: The emulsifier is at least one of isomeric tridecanol polyoxyethylene ether sulfate ammonium salt, diethylene glycol monoethyl ether, propylene glycol monocaprylate, sorbitan monooleate, and sodium lauryl sulfate.

7. The method for manufacturing the reinforced HDPE double-wall corrugated pipe according to claim 5, characterized in that: The organosilicon defoamer is at least one of BYK-038, BYK-037 and BYK-1616.

8. The method for manufacturing the reinforced HDPE double-wall corrugated pipe according to claim 5, characterized in that: The pH regulator is a 0.4-0.6 mol / / L sodium hydroxide aqueous solution.

9. An enhanced HDPE double-wall corrugated pipe, characterized in that: The method is manufactured by the manufacturing method according to any one of claims 1 to 8.

Images