Friction-wear-resistant environment-friendly HDPE (high-density polyethylene) composite material, preparation method and application

Abstract

The invention relates to a friction-wear-resistant environment-friendly HDPE (high-density polyethylene) composite material as well as a preparation method and application thereof. The friction-wear-resistant environment-friendly HDPE composite material comprises 100 parts of high-density polyethylene, 20-30 parts of organic modified glass fibers, 25-35 parts of ramie fibers, 2-5 parts of nano clay, 6-8 parts of color masterbatch, 1-3 parts of a lubricant and 0.5-1.5 parts of a compound antioxidant, through organic modification of the glass fibers and combination of the ramie fibers, the glass fibers and ultrafine micropore structures of the ramie fibers can form an intertwined net structure, the composite structure reserves the advantages of a single reinforcing material, meanwhile, the nano clay is introduced as an interface compatilizer of an HDPE matrix, the design capacity of the composite material is improved, and the composite material has the advantages of being high in mechanical strength, high in mechanical strength and the like. The modified HDPE composite material has the advantages that rigidity enhancement and friction and wear resistance improvement which cannot be achieved by a single reinforcing material are achieved, the long-term stability problem of the HDPE material in a complex medium conveying environment is solved, the modified HDPE composite material has unique and comprehensive performance, and the application range of the HDPE material is widened.

Description

Technical Field

[0001] This invention relates to the field of pipe technology, specifically to a friction-resistant and wear-resistant environmentally friendly HDPE composite material, its preparation method, and its application. Background Technology

[0002] With the continuous advancement of modern engineering technology and the expanding application fields, high-density polyethylene (HDPE) pipes have been widely used in municipal construction, transportation engineering, water conservancy projects, and industrial fields due to their unique advantages. However, the increasing diversity and complexity of usage environments place higher demands on the performance of HDPE pipes. In buried applications, HDPE pipes need to withstand long-term pressure from the soil and external impacts, requiring sufficient compressive strength. Rigidity is a crucial indicator of compressive strength; improving rigidity effectively enhances compressive performance and ensures stability during long-term use. Simultaneously, ring stiffness is an important indicator of a pipe's resistance to circumferential deformation. Only with sufficiently high ring stiffness can the pipe maintain its shape stability under external pressure, preventing deformation and breakage. Furthermore, with the increasing application of HDPE pipes in industrial fields, they need to transport media with frictional abrasion and corrosive properties, such as mineral slurry and coal-water slurry. In summary, these specific application scenarios place even higher demands on the rigidity and wear resistance of the pipes. Therefore, enhancing the rigidity and wear resistance of pipes to adapt them to specific application scenarios and extend their service life to meet engineering design and construction requirements is of great practical significance for broadening the application range of HDPE pipes and promoting their superior performance in more fields. However, simultaneously improving the rigidity and wear resistance of HDPE pipes is a difficult problem in the current research field.

[0003] To address the aforementioned issues, Chinese patent "A Tensile-Resistant PE Gas Pipe" (Application No.: CN202211263139.6, Authorization Announcement Date: 20240202) discloses a tensile-resistant PE gas pipe. The method involves adding high-density polyethylene, cross-linked polyethylene, modified ramie fiber, modified magnesium sulfate whiskers, and other raw materials in a specific ratio to a high-speed mixer. The mixture is then extruded and granulated to obtain raw material particles, which are then melted and extruded again to prepare the tensile-resistant PE pipe. This method utilizes the compatibility between modified ramie fiber and polyethylene to improve the tensile strength of the PE gas pipe. However, it does not investigate the impact of the special structure and wear resistance of ramie fiber on the rigidity and friction / wear properties of polyethylene. The experimental results also verify that the improvement in the tensile properties of the PE gas pipe using only modified ramie fiber is limited.

[0004] Chinese patent "An Environmentally Friendly Composite Material for Pipelines and Its Preparation Method" (Application No.: CN202411701000.4, Authorization Announcement Date: 20250311) discloses an environmentally friendly composite material for pipelines and its preparation method. The method comprises nylon, maleic anhydride grafted polymer, flat glass fiber, hemp fiber, inorganic nanoparticles, coupling agent, lubricant, and antioxidant. The method utilizes hemp fiber and flat glass fiber to form a composite fiber, improving the dispersibility of the flat glass fiber in the resin and the interfacial bonding force between the flat glass fiber and the nylon resin, thereby enhancing the mechanical properties of the composite material. This method verifies that the composite fiber-modified nylon resin possesses good strength and toughness. However, it does not conduct in-depth research and discussion on the rigidity and friction and wear resistance of the composite fiber in pipelines. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a friction-resistant and wear-resistant environmentally friendly HDPE composite material with excellent rigidity and wear resistance, its preparation method, and its application.

[0006] To achieve the above objectives, a friction-resistant and wear-resistant environmentally friendly HDPE composite material is mainly composed of the following components in parts by weight: 100 parts high-density polyethylene, 20-30 parts organic modified glass fiber, 25-35 parts ramie fiber, 2-5 parts nano clay, 6-8 parts color masterbatch, 1-3 parts lubricant, and 0.5-1.5 parts compounded antioxidant.

[0007] A composite system of ramie fiber and organically modified glass fiber is used to improve the rigidity and abrasion resistance of HDPE raw materials. The introduction of natural ramie fiber reduces the content of other reinforcing materials and raw materials, lowers the energy consumption in the production of synthetic materials, and improves the wear resistance of HDPE, providing an option for the development of green and environmentally friendly reinforced HDPE materials. The introduction of organically modified glass fiber further enhances the rigidity and wear resistance of HDPE. By combining organically modified glass fiber with ramie fiber, the advantages of a single reinforcing material are retained while improving the design capabilities of the material. To improve the interfacial compatibility between the composite fiber system and the HDPE matrix material, nano-clay is introduced as a compatibilizer. This allows the modified composite material to achieve effects that a single reinforcing material cannot, combining high interfacial bonding strength between the fiber and the matrix with the fracture toughness of the composite material, giving the modified HDPE composite material unique and comprehensive performance.

[0008] Preferably, the organically modified glass fiber is prepared according to the following method: The glass fiber is oxidized, and the oxidized glass fiber is mixed with epoxy resin and heated to obtain organic modified glass fiber, wherein the weight ratio of glass fiber to epoxy resin is 1:3-5.

[0009] The lubricant is a fatty acid amide lubricant.

[0010] Preferably, the fatty acid amide lubricant is one or more of N,N-ethylene bis-stearamide, oleamide, erucamide, and n-butyl stearate.

[0011] The compound antioxidant is composed of hindered phenolic antioxidants and thiobisphenol antioxidants, wherein the ratio of hindered phenolic antioxidants to thiobisphenol antioxidants is 1:2.

[0012] Preferably, the method for oxidizing glass fibers includes: adding glass fibers to hydrogen peroxide at 70°C for heat treatment for 30 min, followed by filtration, washing, and drying; then immersing the treated glass fibers in titanate coupling agent at 60°C±5°C for 2-3 h to complete the oxidation treatment; when the volume ratio of the oxidized fibers is 1:25, filtration, washing, and drying are performed to complete the oxidation treatment of the glass fibers.

[0013] Preferably, the color masterbatch is made of carbon black.

[0014] A method for preparing a friction-resistant and wear-resistant environmentally friendly HDPE composite material, comprising: Step 1. Preparation of organically modified glass fiber; The glass fiber is oxidized, and the oxidized glass fiber is mixed with epoxy resin and heated to obtain organically modified glass fiber; Step 2. Preparation of composite material particles; First, high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant are added to a high-speed mixer in proportion and stirred at 900-1000 r / min for 10-15 min. Then, the mixture is extruded using a twin-screw extruder to form composite material particles. The composition of high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant is as follows: 100 parts high-density polyethylene, 20-30 parts organically modified glass fiber, 25-35 parts ramie fiber, 2-5 parts nano-clay, 6-8 parts color masterbatch, 1-3 parts lubricant, and 0.5-1.5 parts compound antioxidant.

[0015] Preferably, the preparation method of organic modified glass fiber in step 1 includes: Step 101. Add glass fiber to hydrogen peroxide at 70°C for heat treatment for 30 minutes, then filter, wash and dry it. Step 102. Immerse the glass fiber treated in Step 101 in titanate coupling agent at 60℃±5℃ for 2-3 hours to complete the oxidation treatment. When the volume ratio of the fiber after oxidation treatment is 1:25, filter, wash and dry to complete the oxidation treatment of the glass fiber. Step 103. Mix the oxidized glass fiber from step 102 with epoxy resin and heat at 170℃±10℃ for 45±15 min to obtain organic modified glass fiber, wherein the weight ratio of glass fiber to epoxy resin is 1:3~5.

[0016] Application of a friction-resistant and wear-resistant environmentally friendly HDPE composite material, which can be used in one or more of HDPE drainage pipes, HDPE single-wall corrugated pipes, HDPE double-wall corrugated pipes, HDPE reinforced hollow wall spiral pipes, trenchless special pipes, and HDPE reinforced hollow wall spiral traction pipes.

[0017] The specific beneficial effects of this invention are: This study utilizes natural ramie fiber and modified glass fiber to enhance the rigidity and abrasion resistance of HDPE matrix materials. Natural ramie fiber and natural mineral nano-clay are introduced as environmentally friendly reinforcing materials for HDPE. Firstly, the organic modification of glass fiber and its combination with ramie fiber allows the glass fiber to form an intertwined network structure with the ultrafine porous structure of ramie fiber. This composite structure retains the advantages of a single reinforcing material while improving the design capabilities of the composite material, achieving rigidity enhancement and abrasion resistance improvements that cannot be achieved by a single reinforcing material. Secondly, the use of natural mineral nano-clay as an interface compatibilizer combines high interfacial bonding between the fiber and the matrix with the fracture toughness of the composite material, further improving the flexural strength of the HDPE composite material and solving the problem of HDPE's tendency to crack. This results in a modified HDPE composite material with unique and comprehensive performance.

[0018] Composite fibers were used as reinforcing materials, and nano-clay was used as a compatibility modifier to synergistically enhance the mechanical properties and improve the thermal stability of the composite material. Specifically, modified glass fiber and natural organic fiber—ramie fiber—were used as reinforcing materials, with HDPE as the matrix resin. Through molecular structure design, high-performance fiber-reinforced HDPE materials were prepared. The developed material and modification technology improved the rigidity and wear resistance of the matrix resin, while the introduction of natural fibers provided a sustainable option for green and environmentally friendly materials.

[0019] On the other hand, the modification / reinforcement of polymer matrices with composite fibers usually involves surface treatment or the use of compatibilizers to enhance the interfacial bonding between the polymer matrix and natural fillers. While these traditional methods are effective, they can be costly and complex. Therefore, this application introduces the use of nanoclay as a compatibilizer to reinforce HDPE composites. Nanoclay typically consists of a basic layer composed of two silicate layers sandwiching an alumina octahedron. These layers can be bonded through ion exchange to form layered silicate minerals. At the same time, the surface of nanoclay contains a large number of active groups, such as Si-OH, which can react with organic or other inorganic substances to form organic-inorganic hybrid materials. When nanoclay is fully dispersed in HDPE, it can not only improve the mechanical and thermal properties of the composite material, but also replace additional compatibilizers or functionalization treatments. Nanoclay has unique characteristics such as high aspect ratio and large specific surface area, and plays an important role in improving the mechanical properties of HDPE composites. Therefore, the introduction of nanoclay also has a certain synergistic reinforcing effect on toughness and rigidity.

[0020] Composite fiber system design – synergistic reinforcement of modified glass fiber and natural ramie fiber; This invention employs a composite system of modified glass fiber and natural ramie fiber to reinforce the HDPE matrix. Through molecular structure design, the material's performance is enhanced. The glass fiber undergoes hydrogen peroxide oxidation, titanate coupling agent modification, and epoxy resin coating, significantly improving interfacial bonding. Furthermore, it forms a complex, intertwined network structure with the ultra-fine porous ramie fiber. The introduction of ramie fiber not only reduces costs but also endows the material with environmentally friendly properties. Traditional research often focuses on single-fiber reinforcement, while this invention achieves synergistic optimization of mechanical properties through the complementary stiffness and toughness of the two fibers, while simultaneously reducing dependence on synthetic fibers and promoting sustainable development.

[0021] Nano clay as a multifunctional compatibilizer—replacing traditional compatibilizers and synergistically enhancing their properties; This invention innovatively uses nano-clay as a compatibilizer to replace traditional surface treatments or compatibilizers, simplifying the process and reducing costs. The layered structure (silicate-alumina octahedron) and surface-active groups (Si-OH) of nano-clay can simultaneously undergo physical adsorption or chemical bonding with HDPE matrix and composite fibers, improving interfacial compatibility. Its high aspect ratio and large specific surface area not only enhance the rigidity, wear resistance and thermal stability of the material, but also achieve synergistic enhancement of toughness and rigidity through an "organic-inorganic hybrid" mechanism, avoiding the high cost problem of traditional compatibilizers.

[0022] Green and environmentally friendly approach – a sustainable combination of natural fibers and nano-clay; This invention constructs an environmentally friendly HDPE composite material by introducing ramie fiber (a natural renewable resource) and nano-clay (a natural mineral). The biodegradability of ramie fiber and the low toxicity of nano-clay reduce environmental pollution, while the highly efficient reinforcing effect of nano-clay reduces reliance on synthetic fillers. This design aligns with the trend of green materials development. Traditional fiber-reinforced composite materials require complex surface treatments or additional compatibilizers, while this invention simplifies the process through the multifunctional properties of nano-clay (improved compatibility, mechanical reinforcement, and enhanced thermal stability). The ion exchange capacity and active groups of nano-clay allow it to simultaneously perform multiple roles such as compatibilization, reinforcement, and barrier after being fully dispersed in HDPE, reducing production steps and equipment investment, and significantly lowering overall costs.

[0023] Synergistic improvement of rigidity, toughness, and wear resistance – multi-scale structural design This invention overcomes the performance limitations of a single reinforcing phase through a multi-scale reinforcement strategy of "composite fiber + nano-clay". Glass fiber provides rigid support, ramie fiber absorbs impact energy, and nano-clay enhances wear resistance through interlaminar slip and crack deflection mechanisms. The synergistic effect of these three components achieves a balance between rigidity and toughness in HDPE composites. This structural design provides a high-performance material solution for engineering applications such as anti-corrosion double-wall corrugated pipes. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of this application will be described in further detail below.

[0025] The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. Example 1

[0026] This embodiment provides a method for preparing double-wall corrugated pipes from friction-resistant and wear-resistant environmentally friendly HDPE composite materials; including: Step 1, Preparation of organically modified glass fibers; Step 101. Add glass fiber GF to hydrogen peroxide (0.1 mol / L concentration) at 70℃ for heat treatment for 30 minutes, and then filter, wash and dry it. Step 102. Immerse the glass fiber treated in Step 101 in titanate coupling agent at 60°C for 2.5 hours to complete the oxidation treatment. When the volume ratio of the fiber after oxidation treatment is 1:25, filter, wash and dry to complete the oxidation treatment of the glass fiber. Step 103. Mix the oxidized glass fiber from step 102 with epoxy resin and heat at 170°C for 45 minutes to obtain organic modified glass fiber, wherein the weight ratio of glass fiber to epoxy resin is 1:4; The filtration, washing and drying methods used in this embodiment are conventional methods for those skilled in the art, so the specific operation methods will not be described in detail here. Step 2. Preparation of composite material particles; First, high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant are added to a high-speed mixer in the following proportions and mixed at 950 r / min for 13 min. The specific components of high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant are as follows: 100 parts high-density polyethylene, 25 parts organically modified glass fiber, 30 parts ramie fiber, 3.5 parts nano-clay, 7 parts color masterbatch, 2 parts lubricant, and compound antioxidant. One part of antioxidant is prepared; wherein the masterbatch is carbon black, and the lubricant is a fatty acid amide lubricant, specifically one or more of N,N-ethylene bis-stearamide, oleamide, erucamide, and n-butyl stearate. In this embodiment, N,N-ethylene bis-stearamide is selected as the lubricant; the compound antioxidant is prepared by mixing one of hindered phenolic antioxidants 1010 and 1076 with thiobisphenol antioxidant 300 in a 1:2 ratio. In this embodiment, hindered phenolic antioxidant 1010 and thiobisphenol antioxidant 300 are selected as the compound antioxidant. Then, the mixed mixture is extruded using a twin-screw extruder to form composite material particles, thus obtaining composite material particles; Step 3. Preparation of friction-resistant and wear-resistant environmentally friendly HDPE double-wall corrugated pipe; The composite material particles obtained in step 2 are melted and plasticized in a single-screw extruder, extruded through a die, and then vacuum-shaped, cooled and cured, cut, marked, inspected for quality, and stored to produce a wear-resistant and environmentally friendly HDPE double-wall corrugated pipe. The outer layer main extruder speed (r / min): 18~22, barrel temperature: 210~230℃, die temperature: 195±10℃; the inner layer main extruder speed (r / min): 20~23, barrel temperature: 190~205℃, die temperature: 185±10℃; the molding machine speed (m / min): 2.5±10%. Example 2

[0027] This embodiment provides a method for preparing double-wall corrugated pipes from friction-resistant and wear-resistant environmentally friendly HDPE composite materials; including: Step 1, Preparation of organically modified glass fibers; Step 101. Add glass fiber GF to hydrogen peroxide (0.1 mol / L concentration) at 70℃ for heat treatment for 30 minutes, and then filter, wash and dry it. Step 102. Immerse the glass fiber treated in Step 101 in titanate coupling agent at 55°C for 3 hours to complete the oxidation treatment. When the volume ratio of the fiber after oxidation treatment is 1:25, filter, wash and dry to complete the oxidation treatment of the glass fiber. Step 103. Mix the oxidized glass fiber from step 102 with epoxy resin and heat at 160°C for 60 minutes to obtain organically modified glass fiber, wherein the weight ratio of glass fiber to epoxy resin is 1:3; The filtration, washing and drying methods used in this embodiment are conventional methods for those skilled in the art, so the specific operation methods will not be described in detail here. Step 2. Preparation of composite material particles; First, high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant are added to a high-speed mixer in the specified proportions and mixed at 900 rpm for 15 minutes. The specific components of high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant are as follows: 100 parts high-density polyethylene, 20 parts organically modified glass fiber, 25 parts ramie fiber, 2 parts nano-clay, 6 parts color masterbatch, 1 part lubricant, and compound antioxidant. Oxidizing agent 0.5 parts; wherein the color masterbatch is carbon black, and the lubricant is a fatty acid amide lubricant, specifically one or more of N,N-ethylene bis-stearamide, oleamide, erucamide, and n-butyl stearate. In this embodiment, N,N-ethylene bis-stearamide is selected as the lubricant; the compound antioxidant is a mixture of one of hindered phenolic antioxidants 1010 and 1076 and thiobisphenol antioxidant 300 in a 1:2 ratio. In this embodiment, hindered phenolic antioxidant 1076 and thiobisphenol antioxidant 300 are selected as the mixture. Then, the mixed mixture is extruded using a twin-screw extruder to form composite material particles, thus obtaining composite material particles; Step 3. Preparation of friction-resistant and wear-resistant environmentally friendly HDPE double-wall corrugated pipe; The composite material particles obtained in step 2 are melted and plasticized in a single-screw extruder, extruded through a die, and then vacuum-shaped, cooled and cured, cut, marked, inspected for quality, and stored to produce a wear-resistant and environmentally friendly HDPE double-wall corrugated pipe. The outer layer main extruder speed (r / min): 18~22, barrel temperature: 210~230℃, die temperature: 195±10℃; the inner layer main extruder speed (r / min): 20~23, barrel temperature: 190~205℃, die temperature: 185±10℃; the molding machine speed (m / min): 2.5±10%. Example 3

[0028] This embodiment provides a method for preparing double-wall corrugated pipes from friction-resistant and wear-resistant environmentally friendly HDPE composite materials; including: Step 1, Preparation of organically modified glass fibers; Step 101. Add glass fiber GF to hydrogen peroxide (0.1 mol / L concentration) at 70℃ for heat treatment for 30 minutes, and then filter, wash and dry it. Step 102. Immerse the glass fiber treated in Step 101 in titanate coupling agent at 65°C for 2 hours to complete the oxidation treatment. When the volume ratio of the oxidized fiber is 1:25, filter, wash and dry to complete the oxidation treatment of the glass fiber. Step 103. Mix the glass fiber after oxidation treatment in step 102 with epoxy resin and heat it at 180°C for 30 minutes to obtain organic modified glass fiber, wherein the weight ratio of glass fiber to epoxy resin is 1:5; The methods used for filtration, washing and drying in this embodiment are conventional methods for those skilled in the art, so the specific operation methods will not be described in detail here. Step 2. Preparation of composite material particles; First, high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant are added to a high-speed mixer in the specified proportions and mixed at 1000 rpm for 10 minutes. The specific components of high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant are as follows: 100 parts high-density polyethylene, 30 parts organically modified glass fiber, 35 parts ramie fiber, 5 parts nano-clay, 8 parts color masterbatch, 3 parts lubricant, and compound antioxidant. Antioxidant 1.5 parts; wherein the color masterbatch is carbon black, and the lubricant is a fatty acid amide lubricant, specifically one or more of N,N-ethylene bis-stearamide, oleamide, erucamide, and n-butyl stearate. In this embodiment, N,N-ethylene bis-stearamide is selected as the lubricant; the compound antioxidant is a mixture of one of hindered phenolic antioxidants 1010 and 1076 and thiobisphenol antioxidant 300 in a 1:2 ratio. In this embodiment, hindered phenolic antioxidant 1076 and thiobisphenol antioxidant 300 are selected as the mixture. Then, the mixed mixture is extruded using a twin-screw extruder to form composite material particles, thus obtaining composite material particles; Step 3. Preparation of friction-resistant and wear-resistant environmentally friendly HDPE double-wall corrugated pipe; The composite material particles obtained in step 2 are melted and plasticized in a single-screw extruder, extruded through a die, and then vacuum-shaped, cooled and cured, cut, marked, inspected for quality, and stored to produce a wear-resistant and environmentally friendly HDPE double-wall corrugated pipe. The outer layer main extruder speed (r / min): 18~22, barrel temperature: 210~230℃, die temperature: 195±10℃; the inner layer main extruder speed (r / min): 20~23, barrel temperature: 190~205℃, die temperature: 185±10℃; the molding machine speed (m / min): 2.5±10%.

[0029] The composite material particles prepared according to Examples 1-3 can also be used to prepare one or more of the following: HDPE drainage pipes, HDPE single-wall corrugated pipes, HDPE reinforced hollow wall spiral pipes, trenchless special pipes, and HDPE reinforced hollow wall spiral traction pipes.

[0030] Comparative Example 1 This comparative example provides a method for preparing a bellows, including: Step 1. Add high-density polyethylene, ramie fiber, nano clay, color masterbatch, lubricant and compound antioxidant to a high-speed mixer in a certain proportion and mix them. Then, extrude the mixed mixture with a twin-screw extruder to form composite material particles. Step 2. The composite material particles obtained in Step 1 are melted and plasticized by a single screw extruder, extruded through a die, and then subjected to vacuum shaping, cooling and curing, cutting, inkjet printing, quality inspection, and finished product storage to obtain a corrugated pipe.

[0031] Comparative Example 2 The difference between Comparative Example 2 and Comparative Example 1 is that the composite material of Comparative Example 2 does not contain ramie fiber, but contains organically modified glass fiber.

[0032] Comparative Example 3 The difference between Comparative Example 3 and Comparative Example 1 is that the composite material in Comparative Example 3 does not contain ramie fiber and organic modified glass fiber.

[0033] This application presents tests on the ring stiffness and ring flexibility of Examples 1-3 and Comparative Examples 1-2, respectively, using methods conforming to GB / T9647—2015 and ISO13968:2008. In addition, erosion wear tests were conducted using a pre-mixed abrasive waterjet device, with sample dimensions of 50×50×5 mm. 3 Garnet was used as the abrasive (particle size 120 μm, content 0.25 wt%). Specific erosion parameters were as follows: water pump pressure 1 MPa, nozzle inner diameter 4 mm, target distance 0.5 cm, and erosion times of 3 min, 5 min, and 10 min. Before and after erosion, the samples were ultrasonically cleaned at 40 kHz for 5 min, and then dried in a constant temperature and humidity drying oven for 6 h. The experimental data are shown in the table below.

[0034] As can be seen from the table above, the wear-resistant and environmentally friendly HDPE double-wall corrugated pipe provided in this embodiment of the invention, by adding organically modified glass fiber, ramie fiber, and nano-clay interfacial compatibilizer, can significantly improve the ring stiffness and wear resistance of the HDPE double-wall corrugated pipe. The performance of single-fiber modified HDPE composite material is inferior to that of composite fiber modified HDPE composite material, indicating that the organically modified glass fiber, ramie fiber, and nano-clay added in this embodiment of the invention have a synergistic effect. Furthermore, with the increase of the content of organically modified glass fiber and ramie fiber, the ring stiffness exhibits a phenomenon of first increasing and then decreasing. The principle may be as follows: the introduction of nano-clay as an interfacial compatibilizer between the glass fiber and ramie fiber network structure and the HDPE matrix endows the HDPE composite material with higher structural strength, effectively offsetting the impact of axial jets. Simultaneously, the addition of highly rigid composite fibers effectively offsets the tensile and shear effects of radial and tangential jets when receiving loads, demonstrating unique advantages in wear resistance and improving both the rigidity and wear resistance of the composite material. However, when there is an excessive amount of ramie fiber in the composite material, the ramie fibers that do not form a network structure are randomly distributed in the HDPE matrix. Under the erosion and wear of rotating water jets, the eroded surface of the HDPE composite material exhibits brittle fracture of HDPE, ramie fiber breakage, enhanced stretching vibration of hydroxyl groups on the molecular chains, and increased oxygen content, resulting in increased water absorption on the wear surface. This reduces the stiffness of the composite material and decreases its wear resistance. Therefore, adding a certain amount of composite fiber can make it more uniformly dispersed throughout the system, exhibiting excellent rigidity and wear resistance.

[0035] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A friction- and wear-resistant environmentally friendly HDPE composite material, characterized in that, It is mainly composed of the following components in parts by weight: 100 parts high-density polyethylene, 20-30 parts organic modified glass fiber, 25-35 parts ramie fiber, 2-5 parts nano clay, 6-8 parts color masterbatch, 1-3 parts lubricant, and 0.5-1.5 parts compound antioxidant.

2. The wear-resistant and environmentally friendly HDPE composite material according to claim 1, characterized in that, The organically modified glass fiber is prepared according to the following method: The glass fiber is oxidized, and the oxidized glass fiber is mixed with epoxy resin and heated to obtain organic modified glass fiber, wherein the weight ratio of glass fiber to epoxy resin is 1:3-5.

3. The wear-resistant and environmentally friendly HDPE composite material according to claim 1, characterized in that, The lubricant is a fatty acid amide lubricant.

4. The wear-resistant and environmentally friendly HDPE composite material according to claim 3, characterized in that, The fatty acid amide lubricant is one or more of N,N-ethylene bis-stearamide, oleamide, erucamide, and n-butyl stearate.

5. The wear-resistant and environmentally friendly HDPE composite material according to claim 1, characterized in that, The compound antioxidant is composed of hindered phenolic antioxidants and thiobisphenol antioxidants, wherein the ratio of hindered phenolic antioxidants to thiobisphenol antioxidants is 1:

2.

6. The wear-resistant and environmentally friendly HDPE composite material according to claim 2, characterized in that, The method for oxidizing glass fibers includes: adding glass fibers to hydrogen peroxide at 70°C for heat treatment for 30 minutes, followed by filtration, washing, and drying; then immersing the treated glass fibers in titanate coupling agent at 60°C±5°C for 2-3 hours to complete the oxidation treatment; when the volume ratio of the oxidized fibers is 1:25, filtration, washing, and drying are performed to complete the oxidation treatment of the glass fibers.

7. The wear-resistant and environmentally friendly HDPE composite material according to claim 1, characterized in that, The color masterbatch is made of carbon black.

8. A method for preparing a friction-resistant and wear-resistant environmentally friendly HDPE composite material, characterized in that, include: Step 1. Preparation of organically modified glass fibers; The glass fiber is oxidized, and the oxidized glass fiber is mixed with epoxy resin and heated to obtain organic modified glass fiber. Step 2. Preparation of composite material particles; First, high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant are added to a high-speed mixer in proportion and stirred at 900-1000 r / min for 10-15 min. Then, the mixture is extruded using a twin-screw extruder to form composite material particles. The composition of high-density polyethylene, organically modified glass fiber, ramie fiber, nano-clay, color masterbatch, lubricant, and compound antioxidant is as follows: 100 parts high-density polyethylene, 20-30 parts organically modified glass fiber, 25-35 parts ramie fiber, 2-5 parts nano-clay, 6-8 parts color masterbatch, 1-3 parts lubricant, and 0.5-1.5 parts compound antioxidant.

9. The method for preparing a friction-resistant and wear-resistant environmentally friendly HDPE composite material according to claim 8, characterized in that, Step 1, the preparation method of organic modified glass fiber, includes: Step 101. Add glass fiber to hydrogen peroxide at 70°C for heat treatment for 30 minutes, then filter, wash and dry it. Step 102. Immerse the glass fiber treated in Step 101 in titanate coupling agent at 60℃±5℃ for 2-3 hours to complete the oxidation treatment. When the volume ratio of the fiber after oxidation treatment is 1:25, filter, wash and dry to complete the oxidation treatment of the glass fiber. Step 103. Mix the oxidized glass fiber from step 102 with epoxy resin and heat at 170℃±10℃ for 45±15 min to obtain organic modified glass fiber, wherein the weight ratio of glass fiber to epoxy resin is 1:3~5.

10. An application of the wear-resistant and environmentally friendly HDPE composite material as described in any one of claims 1-7, characterized in that, The composite material can be applied to one or more of the following: HDPE drainage pipe, HDPE single-wall corrugated pipe, HDPE double-wall corrugated pipe, HDPE reinforced hollow wall spiral pipe, trenchless special pipe, and HDPE reinforced hollow wall spiral traction pipe.

Images