High-strength waterproof polyethylene composite material and preparation method thereof

Abstract

The invention discloses a high-strength waterproof polyethylene composite material and a preparation method thereof, and belongs to the technical field of high-molecular compound compositions, and the high-strength waterproof polyethylene composite material comprises the following raw materials by mass: 100-120 parts of high-density polyethylene, 20-30 parts of polypropylene resin, 1-3 parts of an antioxidant, 1-3 parts of a lubricant, and 1-3 parts of a lubricant. The material comprises, by weight, 1-1.2 parts of dicumyl peroxide, 8-10 parts of modified composite glass fibers, 2-3 parts of a stabilizer, 5-6 parts of a coupling agent and 0.3-0.4 part of an antioxidant. According to the high-strength waterproof polyethylene composite material prepared by the preparation method disclosed by the invention, the glass fibers are modified and then uniformly dispersed in a high-density polyethylene matrix, and the flame retardant is compounded with the glass fibers, so that the dispersity of the flame retardant in the high-density polyethylene matrix is improved, and the influence of flame retardant filler on the mechanical property of the polyethylene composite material is reduced; the strength and the flame retardant property of the high-strength waterproof polyethylene composite material are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of compositions of polymer compounds and relates to polyethylene composite materials, in particular to a high-strength waterproof polyethylene composite material and a preparation method thereof. Background Art

[0002] It is the trend of the times to use plastic pipes to replace copper pipes and cement pipes for outdoor water pipes. Polyethylene large-diameter double-wall corrugated pipes have high ring stiffness, low cost, light weight, impact resistance, pressure resistance, acid and alkali corrosion resistance, and long service life. They have been increasingly used in water supply, municipal engineering and other departments. Since polyethylene double-wall corrugated pipes must be buried for a long time, the corrugated pipes are required to withstand greater pressure. Conventional high-density polyethylene corrugated pipes have a low ring stiffness of only 4kN / m 2 In usage scenarios where higher ring stiffness requirements cannot meet usage requirements, it is necessary to perform strength-enhancing modification on the polyethylene material to improve the strength of the polyethylene material.

[0003] In the prior art, fillers are usually used to enhance the physical strength of polyethylene materials. The physical strength of polyethylene materials can be effectively improved by adding non-metallic powder materials. However, polyethylene is a non-polar thermoplastic resin and has poor compatibility with non-metallic inorganic substances and polar polymer materials, and the degree of modification is limited.

[0004] The Chinese invention patent application with publication number CN115433402A discloses an enhanced HDPE double-wall corrugated pipe and a preparation method thereof. By adding a mixture of fluororesin and silicone resin as a filler, it has higher heat resistance and is not easily deformed under pressure after mixing with high-density polyethylene, thereby improving the overall ring stiffness and impact resistance of the corrugated pipe. However, in actual use, since polyethylene composite materials are extremely flammable, the polyethylene material is also required to have a certain flame retardancy.

[0005] The Chinese invention patent application with publication number CN115746460A discloses a composite modified material for corrugated pipes and a preparation method thereof. The composite modified material is obtained by preparing a modified PP resin and a modified nylon blend, and using maleic anhydride grafted POE elastomer as a toughening agent, thereby improving the flame retardancy and tensile strength of the corrugated pipe; however, the addition of flame retardant red phosphorus will significantly increase the melt viscosity of PP, resulting in uneven mixing, reducing the dispersibility of the filler in PP, and having limited effect on the strength improvement of PP. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of how to improve the dispersion of fillers in polyethylene plastics to improve the strength and flame retardant properties of polyethylene plastics, and to provide a high-strength waterproof polyethylene composite material and a preparation method thereof.

[0007] The invention improves the strength and flame retardant performance of the high-strength waterproof polyethylene composite material by modifying the glass fiber and uniformly dispersing the modified glass fiber in a high-density polyethylene matrix and compounding the flame retardant with the glass fiber to improve the dispersibility of the flame retardant in the high-density polyethylene matrix.

[0008] The purpose of the present invention can be achieved through the following technical solutions: A high-strength waterproof polyethylene composite material, comprising the following component raw materials by weight: 100-120 parts of high-density polyethylene, 20-30 parts of polypropylene resin, 1-1.2 parts of dicumyl peroxide, 8-10 parts of modified composite glass fiber, 2-3 parts of stabilizer, 5-6 parts of coupling agent and 0.3-0.4 parts of antioxidant.

[0009] The flame retardant hydroxylated glass fiber is prepared by loading MOF / hydroxylated glass fiber with organic flame retardant.

[0010] MOF / hydroxylated glass fiber is prepared by in-situ generation of MOF on the surface of hydroxylated glass fiber.

[0011] Further, the modified composite glass fiber is prepared by the following steps: The flame retardant hydroxylated glass fiber and tetrahydrofuran are mixed in a reaction kettle, 10-undecene-1-ol is added at 0-5° C., the mixture is stirred for 10-12 hours, the precipitate is collected by filtration, the precipitate is washed, and the modified composite glass fiber is obtained by vacuum drying.

[0012] Furthermore, the usage ratio of the flame retardant hydroxylated glass fiber, tetrahydrofuran and 10-undecene-1-ol is 8-10 g: 100-150 mL: 20-25 g.

[0013] Furthermore, the stabilizer is one of the composite stabilizers of alkylphenol barium, cadmium oleate and zinc cyclohexaneate, the coupling agent is one of the silane coupling agents KH550, KH560 and KH570, and the antioxidant is antioxidant 1010.

[0014] Further, the flame retardant hydroxylated glass fiber is prepared by the following steps: Ammonium polyphosphate is dissolved in deionized water in a reaction kettle, and MOF / hydroxylated glass fiber is added. After ultrasonic dispersion, the temperature is raised to 70-80° C. under stirring, and the deionized water is slowly evaporated to obtain flame-retardant hydroxylated glass fiber.

[0015] Furthermore, the usage ratio of ammonium polyphosphate, deionized water and MOF / hydroxylated glass fiber is 0.5-0.6 g: 100-120 mL: 8-10 g.

[0016] Further, MOF / hydroxylated glass fiber is prepared by the following steps: In a reaction kettle, hydroxylated glass fiber is dispersed in methanol, 2-aminobenzimidazole is added, the temperature is raised to 40-50°C and stirred for 30-40 minutes, and then zinc nitrate hexahydrate is added, stirred to dissolve, and then the temperature is raised to 70-80°C and reacted for 8-10 hours. The precipitate is filtered, washed, and vacuum dried to obtain MOF / hydroxylated glass fiber.

[0017] Furthermore, the usage ratio of hydroxylated glass fiber, methanol, 2-aminobenzimidazole and zinc nitrate hexahydrate is 8-10 g: 100-120 mL: 4-5 g: 3-4 g.

[0018] Further, the hydroxylated glass fiber is prepared by the following steps: The glass fiber is placed in a 0.5-1M hydrochloric acid solution in a reaction kettle, and the temperature is raised to 80-90° C. for immersion and etching for 6-8 hours. The precipitate is collected by filtration, washed, and dried to obtain the hydroxylated glass fiber.

[0019] A method for preparing a high-strength waterproof polyethylene composite material, the preparation method comprising the following steps: High-density polyethylene, polypropylene resin, dicumyl peroxide, modified composite glass fiber, stabilizer, coupling agent and antioxidant are added into a high-speed mixer, heated to 130-150°C, mixed at 400-500rpm for 30-40min, extruded and granulated by an extruder with an extrusion pressure of 5-8Mpa to obtain a high-strength waterproof polyethylene composite material.

[0020] Beneficial effects of the present invention: 1. The high-strength waterproof polyethylene composite material prepared by the present invention is obtained by uniformly dispersing the modified glass fiber in a high-density polyethylene matrix, and by compounding the flame retardant with the glass fiber to improve the dispersibility of the flame retardant in the high-density polyethylene matrix, reduce the influence of the flame retardant filler on the mechanical properties of the polyethylene composite material, and improve the strength and flame retardant properties of the high-strength waterproof polyethylene composite material.

[0021] 2. The preparation method of the present invention increases the hydroxyl content on the surface of the glass fiber by subjecting the surface of the glass fiber to acid treatment and then hydroxylation, and uniformly grafts 2-aminobenzimidazole on the surface of the glass fiber through hydrogen bonding between the hydroxyl group and the amino group on the 2-aminobenzimidazole, and then in situ generates Zn-MOF on the surface of the glass fiber through a hydrothermal reaction to obtain uniformly loaded MOF / hydroxylated glass fiber, and adsorbs the ammonium polyphosphate solution into the porous structure of the Zn-MOF through the adsorption effect generated by the porous structure of the Zn-MOF to obtain a flame-retardant hydroxylated glass fiber with flame retardant function.

[0022] 3. The preparation method of the present invention obtains a modified composite glass fiber by grafting a long-chain olefin on the surface of a glass fiber through the hydrogen bonding of 10-undecene-1-ol and an amino group. During the blending process, the long-chain olefin 10-undecene-1-ol is cross-linked and grafted with a high-density polyethylene under the catalysis of diisopropylbenzene peroxide, which not only improves the dispersibility of the modified composite glass fiber in the high-density polyethylene, but also improves the bonding effect between the modified composite glass fiber and the high-density polyethylene, forming a cross-linked network interface. The interface can act as a medium for transmitting stress and play a role in buffering stress, transferring part of the stress to the glass fiber, thereby enhancing the strength of the high-density polyethylene and effectively alleviating the impact on the high-density polyethylene, thereby improving the strength of the polyethylene composite material. By loading the flame retardant on the modified composite glass fiber, the influence of the flame retardant in the polyethylene composite material on the performance of the polyethylene composite material is reduced, thereby further improving the strength and flame retardant properties of the polyethylene composite material. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1: A method for preparing a high-strength waterproof polyethylene composite material, comprising the following steps: S1. Place the glass fiber in a 0.5M hydrochloric acid solution in a reaction kettle, heat to 80°C, immerse and etch for 6 hours, collect the precipitate by filtration, wash the precipitate with deionized water, and dry at 60°C for 8 hours to obtain the hydroxylated glass fiber.

[0025] S2. In a reactor, 8 g of hydroxylated glass fiber was dispersed in 100 mL of methanol, 4 g of 2-aminobenzimidazole was added, the temperature was raised to 40°C and stirred for 30 min, and then 3 g of zinc nitrate hexahydrate was added to the reactor. After stirring and dissolving, the temperature was raised to 70°C and reacted for 8 h. The precipitate was filtered and washed with methanol and deionized water, and vacuum dried at 60°C for 8 h to obtain MOF / hydroxylated glass fiber.

[0026] S3. Dissolve 0.5 g of ammonium polyphosphate in 100 mL of deionized water in a reactor, add 8 g of MOF / hydroxylated glass fiber, and heat to 70°C under stirring after ultrasonic dispersion. Slowly evaporate the deionized water and place in a 70°C oven for vacuum drying for 8 h to obtain flame-retardant hydroxylated glass fiber.

[0027] S4. In a reaction kettle, 8 g of flame-retardant hydroxylated glass fiber was mixed with 100 mL of tetrahydrofuran, and 20 g of 10-undecene-1-ol was added at 0° C. The mixture was stirred for 10 h, and the precipitate was collected by filtration. The precipitate was washed with ethanol, and vacuum dried at 60° C. to obtain the modified glass fiber.

[0028] S5. 100 g high-density polyethylene, 20 g polypropylene resin, 1 g diisopropylbenzene peroxide, 8 g modified composite glass fiber, 2 g alkylphenol barium, 5 g silane coupling agent KH550 and 0.3 g antioxidant 1010 are mixed in a high-speed mixer at 130°C and 400 rpm for 30 min, and the mixture is extruded and granulated through an extruder with an extrusion pressure of 5 MPa to obtain a high-strength waterproof polyethylene composite material.

[0029] Embodiment 2: A method for preparing a high-strength waterproof polyethylene composite material, comprising the following steps: S1. Place the glass fiber in a 0.75M hydrochloric acid solution in a reaction kettle, heat to 85°C and immerse and etch for 7 hours, collect the precipitate by filtration, wash the precipitate with deionized water, and dry at 65°C for 9 hours to obtain the hydroxylated glass fiber.

[0030] S2. Disperse 9 g of hydroxylated glass fiber in 110 mL of methanol in a reactor, add 4.5 g of 2-aminobenzimidazole, heat to 45 °C and stir for 35 min, then add 3.5 g of zinc nitrate hexahydrate to the reactor, stir to dissolve and heat to 75 °C for 9 h, filter to obtain a precipitate, wash the precipitate with methanol and deionized water, and dry under vacuum at 65 °C for 9 h to obtain MOF / hydroxylated glass fiber.

[0031] S3. Dissolve 0.55 g of ammonium polyphosphate in 110 mL of deionized water in a reactor, add 9 g of MOF / hydroxylated glass fiber, and heat to 75° C. under stirring after ultrasonic dispersion. Slowly evaporate the deionized water and place in a 75° C. oven for vacuum drying for 9 h to obtain flame-retardant hydroxylated glass fiber.

[0032] S4. Mix 9 g of flame-retardant hydroxylated glass fiber with 125 mL of tetrahydrofuran in a reaction kettle, add 22.5 g of 10-undecene-1-ol at 2.5° C., stir for 11 h, collect the precipitate by filtration, wash the precipitate with ethanol, and dry it in vacuo at 65° C. to obtain the modified glass fiber.

[0033] S5. 110 g high-density polyethylene, 25 g polypropylene resin, 1.1 g diisopropylbenzene peroxide, 9 g modified composite glass fiber, 2.5 g cadmium oleate, 5.5 g silane coupling agent KH560 and 0.35 g antioxidant 1010 are mixed in a high-speed mixer at 140 ° C and 450 rpm for 35 min, and extrude and granulate through an extruder with an extrusion pressure of 6.5 MPa to obtain a high-strength waterproof polyethylene composite material.

[0034] Embodiment 3: A method for preparing a high-strength waterproof polyethylene composite material, comprising the following steps: S1. Place the glass fiber in a 1M hydrochloric acid solution in a reaction kettle, heat to 90°C and immerse and etch for 8 hours, collect the precipitate by filtration, wash the precipitate with deionized water, and dry at 70°C for 10 hours to obtain the hydroxylated glass fiber.

[0035] S2. Disperse 10 g of hydroxylated glass fiber in 120 mL of methanol in a reactor, add 5 g of 2-aminobenzimidazole, heat to 50 °C and stir for 40 min, then add 4 g of zinc nitrate hexahydrate to the reactor, stir to dissolve and heat to 80 °C for 10 h, filter to obtain a precipitate, wash the precipitate with methanol and deionized water, and dry under vacuum at 70 °C for 10 h to obtain MOF / hydroxylated glass fiber.

[0036] S3. Dissolve 0.6 g of ammonium polyphosphate in 120 mL of deionized water in a reactor, add 10 g of MOF / hydroxylated glass fiber, and heat to 80° C. under stirring after ultrasonic dispersion. Slowly evaporate the deionized water and place in an oven at 80° C. for vacuum drying for 10 h to obtain flame-retardant hydroxylated glass fiber.

[0037] S4. In a reaction kettle, 10 g of flame-retardant hydroxylated glass fiber was mixed with 150 mL of tetrahydrofuran, and 25 g of 10-undecene-1-ol was added at 5° C. The mixture was stirred for 12 h, and the precipitate was collected by filtration. The precipitate was washed with ethanol, and vacuum dried at 70° C. to obtain the modified glass fiber.

[0038] S5. 120 g high-density polyethylene, 30 g polypropylene resin, 1.2 g diisopropylbenzene peroxide, 10 g modified composite glass fiber, 3 g zinc cyclohexane composite stabilizer, 6 g silane coupling agent KH570 and 0.4 g antioxidant 1010 are mixed in a high-speed mixer at 150 ° C and 500 rpm for 40 min, and extrude and granulate through an extruder with an extrusion pressure of 8 MPa to obtain a high-strength waterproof polyethylene composite material.

[0039] Principle of the invention: The present invention increases the hydroxyl content on the surface of the glass fiber by subjecting the surface of the glass fiber to acid treatment and then hydroxylation, forms hydrogen bonds between the hydroxyl groups and the amino groups on the 2-aminobenzimidazole, uniformly grafts the 2-aminobenzimidazole on the surface of the glass fiber, and then in-situ generates Zn-MOF on the surface of the glass fiber through a hydrothermal reaction to obtain a uniformly loaded MOF / hydroxylated glass fiber, and adsorbs an ammonium polyphosphate solution into the porous structure of the Zn-MOF through the adsorption effect generated by the porous structure of the Zn-MOF, thereby obtaining a flame-retardant hydroxylated glass fiber with a flame-retardant function.

[0040] The modified composite glass fiber is obtained by grafting long-chain olefins on the surface of glass fiber through the hydrogen bonding of 10-undecene-1-ol and amino groups. During the blending process, the long-chain olefin 10-undecene-1-ol is cross-linked and grafted with high-density polyethylene under the catalysis of diisopropylbenzene peroxide, which not only improves the dispersibility of the modified composite glass fiber in the high-density polyethylene, but also improves the bonding effect between the modified composite glass fiber and the high-density polyethylene, forming a cross-linked network interface, which can act as a medium for transmitting stress and play a role in buffering stress, transferring part of the stress to the glass fiber, enhancing the strength of the high-density polyethylene, and effectively alleviating the impact on the high-density polyethylene, thereby improving the strength of the polyethylene composite material.

[0041] By loading the flame retardant on the modified composite glass fiber, the influence of the flame retardant in the polyethylene composite material on the performance of the polyethylene composite material is reduced, and the strength and flame retardant properties of the polyethylene composite material are further improved.

[0042] Comparative Example 1: The difference between Example 1 and Example 1 is that in S3, hydroxylated glass fiber is used to replace MOF / hydroxylated glass fiber to prepare a polyethylene composite material.

[0043] Comparative Example 2: The difference between Example 1 and Example 1 is that in S4, MOF / hydroxylated glass fiber and ammonium polyphosphate are used to replace the flame-retardant hydroxylated glass fiber to prepare a polyethylene composite material.

[0044] Comparative Example 3: The difference from Example 1 is that in S5, the modified composite glass fiber is replaced by flame-retardant hydroxylated glass fiber to prepare a polyethylene composite material.

[0045] The sources of some chemical reagents in the embodiments and comparative examples are as follows: The diameter of the glass fiber is 10-15 μm and the length is 0.6-0.8 mm.

[0046] 10-Undecen-1-ol was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.

[0047] The remaining reagents were commercially available.

[0048] The polyethylene composite materials obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were heated and melted, extruded and plasticized, and molded by a mold to prepare a double-wall corrugated pipe with a DN / OD of 315, a melting temperature of 180° C., an extrusion pressure of 12 MPa, and an extruded pipe pulling speed of 2 m / min. The obtained double-wall corrugated pipe was subjected to a performance test; Place the double-wall corrugated pipe horizontally and determine the compression speed of the plate according to the diameter of the pipe. Use two parallel plates to apply pressure to the sample in a vertical direction. When deformed, a reaction force is generated. The ring stiffness is calculated using the force value when the deformation in the diameter direction of the pipe sample section is 0.03di: The definition of ring stiffness is S=EI / D3 (kN / m 2 ).

[0049] Where E is the elastic modulus of the material; I is the moment of inertia; and D is the average diameter of the pipe.

[0050] The calculation formula is: i =(0.0186+0.02Y i / d i )・F i / L i YY i In the formula, S i is the ring stiffness of the specimen (kN / m 2 );d i is the inner diameter of the pipe (m); F i is the force value when the pipe is deformed by 3% relative to its diameter (kN); L i is the sample length (m); Y i is the deformation (m), relative to the deformation of the pipe when it is 3.0% deformed, such as Y i / d i =0.03.

[0051] According to the standard GB / T 9647-2015, at the specified pressing speed, press down 30% of the average outer wall of the pipe to observe whether the pipe is damaged or has reverse bending.

[0052] The combustion behavior is determined according to the standard GB / T2406.1-2008 Plastic Oxygen Index Method and the limiting oxygen index is determined.

[0053] The results are shown in Table 1: Table 1: Double-wall corrugated pipe sample performance test results

[0054] It can be seen from Table 1 that the double-wall corrugated pipe made of the high-strength waterproof polyethylene composite material prepared in the present invention has high ring stiffness and good ring flexibility, and good flame retardant performance.

[0055] In Comparative Example 1, since Zn-MOF was not synthesized on the surface of the hydroxylated glass fiber, the bonding degree and bonding strength between the flame retardant and the hydroxylated glass fiber were low, and the strength and flame retardant properties of the polyethylene composite material were slightly improved.

[0056] In Comparative Example 2, since ammonium polyphosphate is difficult to dissolve in organic solvents, the MOF / hydroxylated glass fiber has a weak adsorption capacity for large particles of ammonium polyphosphate, the dispersion and bonding strength of the flame retardant in the obtained modified composite glass fiber are low, the flame retardant is easily fallen off from the surface of the glass fiber during the melt blending process, and the flame retardant performance and strength of the obtained polyethylene composite material are low.

[0057] In Comparative Example 3, since the flame retardant hydroxylated glass fiber is not modified, the flame retardant hydroxylated glass fiber is only dispersed and combined with the high-density polyethylene under the action of the coupling agent, it is difficult to form a cross-linked network, and the ring flexibility and ring stiffness are poor.

[0058] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A high-strength waterproof polyethylene composite material, characterized in that: Calculated by mass, it includes the following raw materials: 100-120 parts of high-density polyethylene, 20-30 parts of polypropylene resin, 1-1.2 parts of dicumyl peroxide, 8-10 parts of modified composite glass fiber, 2-3 parts of stabilizer, 5-6 parts of coupling agent and 0.3-0.4 parts of antioxidant; The modified composite glass fiber is prepared by the following steps: Mixing flame-retardant hydroxylated glass fiber and tetrahydrofuran in a reaction kettle, adding 10-undecene-1-ol at 0-5° C., stirring for 10-12 hours, collecting precipitates by filtration, washing the precipitates, and vacuum drying to obtain modified composite glass fiber; The flame retardant hydroxylated glass fiber is prepared by loading an organic flame retardant on MOF / hydroxylated glass fiber; The MOF / hydroxylated glass fiber is prepared by in-situ generation of MOF on the surface of hydroxylated glass fiber.

2. A high-strength waterproof polyethylene composite material according to claim 1, characterized in that: The usage ratio of the flame retardant hydroxylated glass fiber, tetrahydrofuran and 10-undecene-1-ol is 8-10 g: 100-150 mL: 20-25 g.

3. A high-strength waterproof polyethylene composite material according to claim 1, characterized in that: The stabilizer is one of alkylphenol barium, cadmium oleate and zinc cyclohexane compound stabilizers; the coupling agent is one of silane coupling agents KH550, KH560 and KH570; and the antioxidant is antioxidant 1010.

4. A high-strength waterproof polyethylene composite material according to claim 2, characterized in that: The flame retardant hydroxylated glass fiber is specifically prepared by the following steps: Ammonium polyphosphate is dissolved in deionized water in a reaction kettle, and MOF / hydroxylated glass fiber is added. After ultrasonic dispersion, the temperature is raised to 70-80° C. under stirring, and the deionized water is slowly evaporated to obtain flame-retardant hydroxylated glass fiber.

5. A high-strength waterproof polyethylene composite material according to claim 4, characterized in that: The usage ratio of the ammonium polyphosphate, deionized water and MOF / hydroxylated glass fiber is 0.5-0.6 g: 100-120 mL: 8-10 g.

6. A high-strength waterproof polyethylene composite material according to claim 5, characterized in that: The MOF / hydroxylated glass fiber is specifically prepared by the following steps: In a reaction kettle, hydroxylated glass fiber is dispersed in methanol, 2-aminobenzimidazole is added, the temperature is raised to 40-50°C and stirred for 30-40 minutes, and then zinc nitrate hexahydrate is added, stirred to dissolve, and then the temperature is raised to 70-80°C and reacted for 8-10 hours. The precipitate is filtered, washed, and vacuum dried to obtain MOF / hydroxylated glass fiber.

7. A high-strength waterproof polyethylene composite material according to claim 6, characterized in that: The dosage ratio of the hydroxylated glass fiber, methanol, 2-aminobenzimidazole and zinc nitrate hexahydrate is 8-10 g: 100-120 mL: 4-5 g: 3-4 g.

8. A high-strength waterproof polyethylene composite material according to claim 7, characterized in that: The hydroxylated glass fiber is prepared by the following steps: The glass fiber is placed in a 0.5-1M hydrochloric acid solution in a reaction kettle, and the temperature is raised to 80-90° C. for immersion and etching for 6-8 hours. The precipitate is collected by filtration, washed, and dried to obtain the hydroxylated glass fiber.

9. The method for preparing a high-strength waterproof polyethylene composite material according to claim 1, characterized in that: The preparation method comprises the following steps: High-density polyethylene, polypropylene resin, dicumyl peroxide, modified composite glass fiber, stabilizer, coupling agent and antioxidant are added into a high-speed mixer, heated to 130-150°C, mixed at 400-500rpm for 30-40min, extruded and granulated by an extruder with an extrusion pressure of 5-8Mpa to obtain a high-strength waterproof polyethylene composite material.

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