High-strength and high-span three-layer co-extrusion wood-plastic floor and preparation method thereof

Abstract

The invention relates to the technical field of wood-plastic materials, and particularly discloses a high-strength and high-span three-layer co-extrusion wood-plastic floor and a preparation method. The co-extrusion wood-plastic floor comprises a surface layer, a core layer and a middle layer, the middle layer wraps the core layer, the surface layer wraps the middle layer, and the surface layer is a polyethylene material layer; the core layer is prepared from 35 to 45 parts of a polyethylene material, 35 to 50 parts of an ABS (Acrylonitrile Butadiene Styrene) material, 22 to 28 parts of wood flour, 20 to 35 parts of a recycled waste fiber material, 1.2 to 1.8 parts of zinc stearate and 1.2 to 1.8 parts of a titanate coupling agent; the middle layer is prepared from 70 to 85 parts of a polyethylene material, 30 to 50 parts of an ABS (Acrylonitrile Butadiene Styrene) material, 20 to 35 parts of a recycled waste fiber material, 1.2 to 1.8 parts of a titanate coupling agent and 1.2 to 1.8 parts of zinc stearate. According to the wood-plastic floor, the mechanical property of the wood-plastic floor in a high-span use scene can be improved, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wood-plastic materials, and in particular to a high-strength high-span three-layer co-extrusion wood-plastic floor and a preparation method thereof. BACKGROUND

[0002] Wood-plastic composite material is a new type of environmentally friendly material made of wood fiber or plant fiber and thermoplastic plastic as the main raw material, adding various processing aids, and then through processes such as melting mixing and extrusion molding. With the enhancement of environmental awareness and the improvement of performance requirements for outdoor decorative materials, wood-plastic floors have been widely used in outdoor gardens, terraces, and boardwalks because they combine the advantages of wood and plastic, such as corrosion resistance, moisture resistance, non-deformation, and recyclability.

[0003] In related technologies, CN117487372A discloses a low-expansion co-extrusion wood-plastic floor and a preparation method thereof, which includes a core and an outer layer arranged on the surface of the core. The core includes the following components by weight: polyethylene mixture 40-50 parts, special wood powder 55-70 parts, lubricant 3-5 parts, and filler 12-18 parts. The outer layer includes the following components by weight: high-density polyethylene 40-50 parts, glass fiber 25-35 parts, infrared reflective pigment 2-5 parts, ultraviolet resistance agent 0.6-0.8 parts, stabilizer 1-2 parts, and coupling agent 0.5-1.5 parts.

[0004] However, the above-mentioned wood-plastic floor has the problem of insufficient strength in high-span use scenarios, which can easily bend, break, and affect its performance and service life. Currently, some technical solutions increase the thickness of the board or add reinforcing fibers to improve the strength, but such methods not only significantly increase the production cost, but also may cause poor material flowability, increased processing difficulty, and sacrifice part of the flexibility and weather resistance. Therefore, developing wood-plastic floor preparation technology that balances high performance and economy has become a key problem to be solved in the industry. SUMMARY

[0005] In order to improve the mechanical properties of wood-plastic floors in high-span use scenarios and reduce production costs, the present application provides a high-strength high-span three-layer co-extrusion wood-plastic floor and a preparation method thereof.

[0006] In the first aspect, the present application provides a high-strength high-span three-layer co-extrusion wood-plastic floor, which adopts the following technical solution: A high-strength, high-span three-layer co-extruded wood-plastic composite flooring comprises a surface layer, a core layer, and an intermediate layer. The intermediate layer encloses the core layer, and the surface layer encloses the intermediate layer. The surface layer is a polyethylene material layer. Based on the total weight of the core layer, the core layer comprises the following raw materials in parts by weight: 35-45 parts polyethylene material, 35-50 parts ABS material, 22-28 parts wood flour, 20-35 parts recycled waste fiber material, 1.2-1.8 parts zinc stearate, and 1.2-1.8 parts titanate coupling agent. Based on the total weight of the intermediate layer, the intermediate layer comprises the following raw materials in parts by weight: 70-85 parts polyethylene material, 30-50 parts ABS material, 20-35 parts recycled waste fiber material, 1.2-1.8 parts titanate coupling agent, and 1.2-1.8 parts zinc stearate.

[0007] In one specific implementation, the ABS material comprises ABS masterbatch and ABS waste plastic in a weight ratio of (3-4):1.

[0008] In one specific implementation, both the core layer and the intermediate layer further include polyethylene grafted maleic anhydride, wherein the weight ratio of the polyethylene grafted maleic anhydride to the recycled waste fiber material in both the core layer and the intermediate layer is 1:(5-8).

[0009] In one specific implementation, the polyethylene material comprises polyethylene masterbatch and recycled waste polyethylene material in a weight ratio of (1-2):3.

[0010] In one specific implementation scheme, the surface layer comprises, by weight, the following raw materials: 55-65 parts polyethylene masterbatch, 6-9 parts nano calcium carbonate, 0.6-0.9 parts hindered phenolic antioxidant, 0.7-0.9 parts ultraviolet absorber, and 1.2-1.8 parts titanate coupling agent.

[0011] In one specific implementation scheme, the recycled waste fiber material includes at least one of waste textile fibers, waste wind turbine blade fibers, or waste glass fibers.

[0012] Secondly, this application provides a method for preparing a high-strength, high-span three-layer co-extruded wood-plastic flooring, which adopts the following technical solution: A method for preparing high-strength, high-span three-layer co-extruded wood-plastic composite flooring includes the following steps: S1. According to the core layer ratio, dry polyethylene material, ABS material, wood flour and recycled waste fiber material to a moisture content of ≤3%, mix them, add zinc stearate and titanate coupling agent, stir evenly to obtain core material; S2. According to the ratio of the intermediate layer, dry the polyethylene material, ABS material and recycled waste fiber material to a moisture content of ≤3%, mix them, add zinc stearate and titanate coupling agent, stir evenly, and obtain the intermediate material. S3. The surface material, intermediate material and core material are co-extruded into three layers. The core material forms the core layer, the intermediate material forms the intermediate layer that wraps the core layer, and the surface material forms the surface layer that wraps the intermediate layer, thus obtaining a high-strength, high-span three-layer co-extruded wood-plastic flooring.

[0013] In a specific feasible implementation, in step S3, the surface material, intermediate material, and core material are respectively added to a screw extruder and compounded through a stacked three-layer co-extrusion die. The temperature of the screw extruder is 160-170℃ in the feeding section, 170-180℃ in the compression section, 180-190℃ in the homogenization section, and 177-183℃ in the die. The screw speed is 18-22 r / min, and the melt pressure difference between each layer is 0.8-1.2 MPa.

[0014] In summary, this application has the following beneficial effects: 1. This application adopts a three-layer co-extruded composite structure, with the core layer containing polyethylene, ABS, wood flour, and recycled waste fiber materials, the middle layer containing polyethylene, ABS, and recycled waste fiber materials, and the surface layer being polyethylene material. This structure can form a strong composite reinforcement effect, reducing costs while ensuring performance, and helping to improve the mechanical properties of wood-plastic flooring in high-span usage scenarios.

[0015] 2. In this application, polyethylene masterbatch and recycled waste polyethylene material with a weight ratio of (1-2):3, ABS masterbatch and ABS waste plastic with a weight ratio of (3-4):1, and polyethylene grafted with maleic anhydride are preferred, which helps to further improve the mechanical properties of wood-plastic flooring in high-span usage scenarios. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the high-strength, high-span three-layer co-extruded wood-plastic flooring in Embodiment 1 of this application.

[0017] Reference numerals: 1. Surface layer; 2. Intermediate layer; 3. Core layer. Detailed Implementation

[0018] Unless otherwise specified, all raw materials used in this application were commercially available. Specifically, the polyethylene masterbatch was Exxon LL6201RQ. The nano-calcium carbonate, with a mesh size between 200-1250, was purchased from Xuancheng Huaxin Chemical Co., Ltd. The hindered phenolic antioxidant was antioxidant 3114. The ultraviolet absorber was UV-326. The titanate coupling agent was NXH-101. The ABS masterbatch was PetroChina Jilin Chemical GE150. The wood flour, with a mesh size between 60-80, was purchased from Shijiazhuang Woyuan Mining Co., Ltd. The waste textile fiber was polyester fiber with a length of 3 mm and a fineness of 2.2-3.3 dtex. The waste wind turbine blade fiber was fiber from recycled waste wind turbine blades with a length of 3 mm and a fineness of 2.2-3.3 dtex. The waste glass fiber was glass fiber with a length of 3 mm and a fineness of 2.2-3.3 dtex. Polyethylene grafted with maleic anhydride is Arkema 18302. Recycled waste polyethylene material is recovered waste polyethylene powder. Recycled ABS plastic is recovered waste ABS powder.

[0019] The shapes of the surface layer, core layer, and intermediate layer in the accompanying drawings of this application are merely one optional implementation and are not intended to limit this application.

[0020] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0021] Example 1 like Figure 1 As shown, this embodiment provides a high-strength, high-span three-layer co-extruded wood-plastic flooring, including a surface layer, a core layer, and an intermediate layer, with the intermediate layer wrapping the core layer and the surface layer wrapping the intermediate layer.

[0022] The surface layer comprises the following raw materials: 60 kg of polyethylene masterbatch, 7.5 kg of nano calcium carbonate, 0.75 kg of hindered phenolic antioxidant, 0.8 kg of ultraviolet absorber, and 1.5 kg of titanate coupling agent.

[0023] The core layer comprises the following raw materials: 40 kg of polyethylene masterbatch, 42 kg of ABS masterbatch, 25 kg of wood flour, 27 kg of waste textile fibers, 1.5 kg of zinc stearate, and 1.5 kg of titanate coupling agent.

[0024] The intermediate layer comprises the following raw materials: 77 kg of polyethylene masterbatch, 40 kg of ABS masterbatch, 27 kg of waste textile fibers, 1.5 kg of titanate coupling agent, and 1.5 kg of zinc stearate.

[0025] This embodiment also provides a method for preparing high-strength, high-span three-layer co-extruded wood-plastic flooring, comprising the following steps: S1. According to the core layer ratio, dry polyethylene material, ABS material, wood flour and recycled waste fiber material to a moisture content of ≤3%, mix them, add zinc stearate and titanate coupling agent, and continue to stir until uniform to obtain the core material.

[0026] S2. According to the ratio of the intermediate layer, dry the polyethylene material, ABS material and recycled waste fiber material to a moisture content of ≤3%, mix them, add zinc stearate and titanate coupling agent, and continue to stir until uniform to obtain the intermediate material.

[0027] S3. The surface material, intermediate material, and core material are fed into three screw extruders respectively. The three independent screw extruders work together to feed the material, and the three layers are co-extruded through a stacked three-layer co-extrusion die. The core material forms the core layer, the intermediate material forms the intermediate layer surrounding the core layer, and the surface material forms the surface layer surrounding the intermediate layer, resulting in a high-strength, high-span three-layer co-extruded wood-plastic flooring. The screw extruder's feeding section temperature is 165℃, the compression section temperature is 175℃, the homogenization section temperature is 185℃, and the die temperature is 180℃; the screw speed is 20 r / min, and the melt pressure difference between each layer is 1 MPa.

[0028] Example 2 The only difference between this embodiment and Embodiment 1 is that the core layer in this embodiment comprises the following raw materials: 35 kg of polyethylene masterbatch, 50 kg of ABS masterbatch, 28 kg of wood flour, 35 kg of waste textile fibers, 1.8 kg of zinc stearate, and 1.8 kg of titanate coupling agent. The intermediate layer comprises the following raw materials: 70 kg of polyethylene masterbatch, 50 kg of ABS masterbatch, 35 kg of waste textile fibers, 1.8 kg of titanate coupling agent, and 1.8 kg of zinc stearate.

[0029] Example 3 The only difference between this embodiment and Embodiment 1 is that the core layer in this embodiment comprises the following raw materials: 45 kg of polyethylene masterbatch, 35 kg of ABS masterbatch, 22 kg of wood flour, 20 kg of waste textile fibers, 1.2 kg of zinc stearate, and 1.2 kg of titanate coupling agent. The intermediate layer comprises the following raw materials: 85 kg of polyethylene masterbatch, 30 kg of ABS masterbatch, 20 kg of waste textile fibers, 1.2 kg of titanate coupling agent, and 1.2 kg of zinc stearate.

[0030] Example 4 The only difference between this embodiment and Embodiment 1 is that the surface layer of this embodiment includes the following raw materials: 55 kg of polyethylene masterbatch, 9 kg of nano calcium carbonate, 0.9 kg of hindered phenolic antioxidant, 0.9 kg of ultraviolet absorber, and 1.8 kg of titanate coupling agent.

[0031] Example 5 The only difference between this embodiment and Embodiment 1 is that the surface layer of this embodiment includes the following raw materials: 65 kg of polyethylene masterbatch, 6 kg of nano calcium carbonate, 0.6 kg of hindered phenolic antioxidant, 0.7 kg of ultraviolet absorber, and 1.2 kg of titanate coupling agent.

[0032] Example 6 The only difference between this embodiment and Embodiment 1 is that, in the raw materials and preparation process of the core layer and intermediate layer, the polyethylene masterbatch is replaced with a mixture of polyethylene masterbatch and recycled waste polyethylene material in an equal weight ratio of 1:3.

[0033] Example 7 The only difference between this embodiment and Embodiment 1 is that, in the raw materials and preparation process of the core layer and intermediate layer, the polyethylene masterbatch is replaced with a mixture of polyethylene masterbatch and recycled waste polyethylene material in an equal weight ratio of 1:2.

[0034] Example 8 The only difference between this embodiment and Embodiment 1 is that, in the raw materials and preparation process of the core layer and intermediate layer, the polyethylene masterbatch is replaced with a mixture of polyethylene masterbatch and recycled waste polyethylene material in an equal weight ratio of 2:3.

[0035] Example 9 The only difference between this embodiment and Embodiment 1 is that, in the raw materials and preparation process of the core layer and intermediate layer, the ABS masterbatch is replaced with a mixture of ABS masterbatch and ABS waste plastic in an equal weight ratio of 3:1.

[0036] Example 10 The only difference between this embodiment and Embodiment 1 is that, in the raw materials and preparation process of the core layer and intermediate layer, the ABS masterbatch is replaced with a mixture of ABS masterbatch and ABS waste plastic in an equal weight ratio of 3.5:1.

[0037] Example 11 The only difference between this embodiment and Embodiment 1 is that, in the raw materials and preparation process of the core layer and intermediate layer, the ABS masterbatch is replaced with a mixture of ABS masterbatch and ABS waste plastic in an equal weight ratio of 4:1.

[0038] Example 12 The only difference between this embodiment and Embodiment 1 is that, in the raw materials and preparation process of the core layer and the intermediate layer, an equal amount of waste wind turbine blade fibers are used to replace waste textile fibers.

[0039] Example 13 The only difference between this embodiment and Embodiment 1 is that, in the raw materials and preparation process of the core layer and the intermediate layer, an equal amount of waste glass fiber is used to replace waste textile fiber.

[0040] Example 14 The difference between this embodiment and Embodiment 1 lies only in that the core layer of this application comprises the following raw materials: 40 kg of polyethylene masterbatch, 42 kg of ABS masterbatch, 25 kg of wood flour, 27 kg of waste textile fibers, 1.5 kg of zinc stearate, 1.5 kg of titanate coupling agent, and 4.5 kg of polyethylene grafted maleic anhydride. The intermediate layer comprises the following raw materials: 77 kg of polyethylene masterbatch, 40 kg of ABS masterbatch, 27 kg of waste textile fibers, 1.5 kg of titanate coupling agent, 1.5 kg of zinc stearate, and 4.5 kg of polyethylene grafted maleic anhydride.

[0041] Example 15 The difference between this embodiment and Embodiment 1 lies only in that the core layer of this application comprises the following raw materials: 40 kg of polyethylene masterbatch, 42 kg of ABS masterbatch, 25 kg of wood flour, 27 kg of waste textile fibers, 1.5 kg of zinc stearate, 1.5 kg of titanate coupling agent, and 5.4 kg of polyethylene grafted maleic anhydride. The intermediate layer comprises the following raw materials: 77 kg of polyethylene masterbatch, 40 kg of ABS masterbatch, 27 kg of waste textile fibers, 1.5 kg of titanate coupling agent, 1.5 kg of zinc stearate, and 5.4 kg of polyethylene grafted maleic anhydride.

[0042] Example 16 The difference between this embodiment and Embodiment 1 lies only in that the core layer of this application comprises the following raw materials: 40 kg of polyethylene masterbatch, 42 kg of ABS masterbatch, 25 kg of wood flour, 27 kg of waste textile fibers, 1.5 kg of zinc stearate, 1.5 kg of titanate coupling agent, and 3.375 kg of polyethylene grafted maleic anhydride. The intermediate layer comprises the following raw materials: 77 kg of polyethylene masterbatch, 40 kg of ABS masterbatch, 27 kg of waste textile fibers, 1.5 kg of titanate coupling agent, 1.5 kg of zinc stearate, and 3.375 kg of polyethylene grafted maleic anhydride.

[0043] Example 17 The only difference between this embodiment and Embodiment 1 is that in step S3 of the method for preparing high-strength, high-span three-layer co-extruded wood-plastic flooring, the surface material, intermediate material, and core material are respectively added to three screw extruders. The three independent screw extruders feed the material collaboratively, and the three layers are co-extruded through a stacked three-layer co-extrusion die. The core material forms the core layer, the intermediate material forms the intermediate layer surrounding the core layer, and the surface material forms the surface layer surrounding the intermediate layer, resulting in high-strength, high-span three-layer co-extruded wood-plastic flooring. The screw extruder's feeding section temperature is 160℃, the compression section temperature is 170℃, the homogenization section temperature is 180℃, and the die temperature is 177℃; the screw speed is 18 r / min, and the melt pressure difference between each layer is 0.8 MPa.

[0044] Example 18 The only difference between this embodiment and Embodiment 1 is that in step S3 of the method for preparing high-strength, high-span three-layer co-extruded wood-plastic flooring, the surface material, intermediate material, and core material are respectively added to three screw extruders. The three independent screw extruders feed the material collaboratively, and the three layers are co-extruded through a stacked three-layer co-extrusion die. The core material forms the core layer, the intermediate material forms the intermediate layer surrounding the core layer, and the surface material forms the surface layer surrounding the intermediate layer, resulting in high-strength, high-span three-layer co-extruded wood-plastic flooring. The screw extruder's feeding section temperature is 170℃, the compression section temperature is 180℃, the homogenization section temperature is 190℃, and the die temperature is 183℃; the screw speed is 22 r / min, and the melt pressure difference between each layer is 1.2 MPa.

[0045] Comparative Example 1 The only difference between this comparative example and Example 1 is that, in the raw materials and preparation process of the core layer and intermediate layer, an equal amount of polyethylene masterbatch is used to replace the ABS masterbatch.

[0046] Comparative Example 2 The only difference between this comparative example and Example 1 is that, in the raw materials and preparation process of the core layer and intermediate layer, an equal amount of waste textile fibers are replaced with polyethylene masterbatch.

[0047] Comparative Example 3 The only difference between this comparative example and Example 1 is that this example provides a co-extruded wood-plastic flooring, which includes a surface layer and a core layer, with the surface layer wrapping the core layer.

[0048] The surface layer comprises the following raw materials: 60 kg of polyethylene masterbatch, 7.5 kg of nano calcium carbonate, 0.75 kg of hindered phenolic antioxidant, 0.8 kg of ultraviolet absorber, and 1.5 kg of titanate coupling agent.

[0049] The core layer comprises the following raw materials: 40 kg of polyethylene masterbatch, 42 kg of ABS masterbatch, 25 kg of wood flour, 27 kg of waste textile fibers, 1.5 kg of zinc stearate, and 1.5 kg of titanate coupling agent.

[0050] This embodiment also provides a method for preparing co-extruded wood-plastic flooring, including the following steps: S1. According to the core layer ratio, dry polyethylene material, ABS material, wood flour and recycled waste fiber material to a moisture content of ≤3%, mix them, add zinc stearate and titanate coupling agent, and continue to stir until uniform to obtain the core material.

[0051] S2. The surface material and core material are added to two separate screw extruders. The two independent screw extruders work together to feed the material, and the two layers are co-extruded through a co-extrusion die. The core material forms the core layer, and the surface material forms the surface layer that surrounds the core layer, resulting in co-extruded wood-plastic flooring. The screw extruder's feeding section temperature is 165℃, the compression section temperature is 175℃, the homogenization section temperature is 185℃, and the die temperature is 180℃; the screw speed is 20 r / min, and the melt pressure difference between each layer is 1 MPa.

[0052] Performance testing The following performance tests were conducted on Examples 1-18 and Comparative Examples 1-3: Samples measuring 550 mm in length and 140 mm in width were cut from the co-extruded wood-plastic composite flooring prepared in the various embodiments and comparative examples, and the bending strength at a span of 500 mm was tested using a universal testing machine.

[0053] According to ASTM D6862, "Standard Specification for Wood-Plastic Composite Flooring", the interlayer peel strength (N / cm) of co-extruded wood-plastic composite flooring was tested.

[0054] The test results are shown in Table 1.

[0055] Table 1. Detection results of Examples 1-18 and Comparative Examples 1-3 As can be seen from Example 1 and Comparative Examples 1-3, and Table 1, compared to Example 1, the bending strength of Comparative Examples 1-3 is significantly lower under high span conditions, and the interlayer peel strength is also lower. This indicates that the raw material ratio and preparation method of Example 1 help improve the mechanical properties of wood-plastic composite flooring in high span application scenarios.

[0056] As can be seen from Examples 1-18 and Table 1, Examples 1-18 all exhibit high flexural strength under high span conditions, and their interlayer peel strength is greater than 3 N / cm. This indicates that using the raw material ratios and preparation methods within the range of Examples 1-18 helps improve the mechanical properties of wood-plastic composite flooring in high span application scenarios.

[0057] This is likely because ABS has significantly better rigidity, strength, and impact resistance than polyethylene, which enhances the core and intermediate layers' inherent resistance to bending deformation. Recycled waste fiber materials improve the material's tensile strength and creep resistance, preventing excessive permanent deformation of the flooring under long-term loads. The synergistic effect of these two materials creates a powerful composite reinforcement. Wood flour serves as an environmentally friendly filler, reducing costs while maintaining performance. Furthermore, the three-layer composite structure functions as a whole under stress, preventing delamination caused by interlayer peeling. The surface layer of nano-calcium carbonate improves surface hardness and wear resistance, protecting the internal core and intermediate layers. Therefore, this application contributes to improving the mechanical properties of wood-plastic composite flooring in high-span applications.

[0058] Moreover, by comparing the test results of Examples 1-18, it can be seen that using polyethylene masterbatch and recycled waste polyethylene material with a weight ratio of (1-2):3, ABS masterbatch and ABS waste plastic with a weight ratio of (3-4):1, and polyethylene grafted with maleic anhydride can help to further improve the mechanical properties of wood-plastic flooring in high-span usage scenarios.

[0059] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-strength, high-span three-layer co-extruded wood-plastic composite flooring, characterized in that, The material comprises a surface layer, a core layer, and an intermediate layer, wherein the intermediate layer encloses the core layer, and the surface layer encloses the intermediate layer. The surface layer is a polyethylene material layer. Based on the total weight of the core layer, the core layer comprises the following raw materials in parts by weight: 35-45 parts polyethylene material, 35-50 parts ABS material, 22-28 parts wood flour, 20-35 parts recycled waste fiber material, 1.2-1.8 parts zinc stearate, and 1.2-1.8 parts titanate coupling agent. Based on the total weight of the intermediate layer, the intermediate layer comprises the following raw materials in parts by weight: 70-85 parts polyethylene material, 30-50 parts ABS material, 20-35 parts recycled waste fiber material, 1.2-1.8 parts titanate coupling agent, and 1.2-1.8 parts zinc stearate.

2. The high-strength, high-span three-layer co-extruded wood-plastic flooring according to claim 1, characterized in that, The ABS material comprises ABS masterbatch and ABS waste plastic in a weight ratio of (3-4):

1.

3. The high-strength, high-span three-layer co-extruded wood-plastic flooring according to claim 2, characterized in that, Both the core layer and the intermediate layer further include polyethylene grafted maleic anhydride, and in both the core layer and the intermediate layer, the weight ratio of the polyethylene grafted maleic anhydride to the recycled waste fiber material is 1:(5-8).

4. The high-strength, high-span three-layer co-extruded wood-plastic flooring according to claim 3, characterized in that, The polyethylene material comprises polyethylene masterbatch and recycled waste polyethylene material in a weight ratio of (1-2):

3.

5. The high-strength, high-span three-layer co-extruded wood-plastic flooring according to claim 1, characterized in that, Based on the total weight of the surface layer, the surface layer comprises the following raw materials in parts by weight: 55-65 parts polyethylene masterbatch, 6-9 parts nano calcium carbonate, 0.6-0.9 parts hindered phenolic antioxidant, 0.7-0.9 parts ultraviolet absorber, and 1.2-1.8 parts titanate coupling agent.

6. The high-strength, high-span three-layer co-extruded wood-plastic flooring according to claim 1, characterized in that, The recycled waste fiber materials include at least one of waste textile fibers, waste wind turbine blade fibers, or waste glass fibers.

7. A method for preparing high-strength, high-span three-layer co-extruded wood-plastic flooring according to any one of claims 1-6, characterized in that, Includes the following steps: S1. According to the core layer ratio, dry polyethylene material, ABS material, wood flour and recycled waste fiber material to a moisture content of ≤3%, mix them, add zinc stearate and titanate coupling agent, stir evenly to obtain core material; S2. According to the ratio of the intermediate layer, dry the polyethylene material, ABS material and recycled waste fiber material to a moisture content of ≤3%, mix them, add zinc stearate and titanate coupling agent, stir evenly, and obtain the intermediate material. S3. The surface material, intermediate material and core material are co-extruded into three layers. The core material forms the core layer, the intermediate material forms the intermediate layer that wraps the core layer, and the surface material forms the surface layer that wraps the intermediate layer, thus obtaining a high-strength, high-span three-layer co-extruded wood-plastic flooring.

8. The method for preparing high-strength, high-span three-layer co-extruded wood-plastic flooring according to claim 7, characterized in that, In step S3, the surface material, intermediate material, and core material are added to the screw extruder separately and compounded through a stacked three-layer co-extrusion die. The temperature of the screw extruder is 160-170℃ in the feeding section, 170-180℃ in the compression section, 180-190℃ in the homogenization section, and 177-183℃ in the die. The screw speed is 18-22 r / min, and the melt pressure difference between each layer is 0.8-1.2 MPa.

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