A high-strength waterproof polyethylene composite material and its preparation method

Abstract

The present invention discloses a high-strength waterproof polyethylene composite material and a preparation method thereof, belonging to the technical field of compositions of high molecular compounds. By mass, it comprises the following component 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 part of antioxidant; the high-strength waterproof polyethylene composite material prepared by the present invention uniformly disperses the modified glass fiber in the high-density polyethylene matrix, and by compounding the flame retardant with the glass fiber, improves the dispersion of the flame retardant in the high-density polyethylene matrix, reduces the influence of the flame retardant filler on the mechanical properties of the polyethylene composite material, and improves the strength and flame retardant performance of the high-strength waterproof polyethylene composite material.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer compound compositions, relates to polyethylene composites, and specifically relates to a high-strength waterproof polyethylene composite material and a preparation method thereof. Background Art

[0002] Using plastic pipes to replace copper pipes and cement pipes for outdoor water transmission pipes is the trend of the times. 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 transmission, municipal engineering and other departments. Since polyethylene double-wall corrugated pipes must be buried underground for a long time, it is required that the corrugated pipes can withstand greater pressure. The ring stiffness of conventional high-density polyethylene corrugated pipes is relatively low, only reaching 4 kN / m 2 , which cannot meet the usage requirements in scenarios with high requirements for ring stiffness, and it is necessary to strengthen and modify 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. By adding non-metallic powder materials, the physical strength of polyethylene materials can be effectively improved. However, polyethylene is a non-polar thermoplastic resin, and its compatibility with non-metallic inorganic substances and polar polymer materials is poor, and the degree of modification is limited.

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

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

[0006] The purpose of the present invention is to solve the problem of how to improve the dispersion degree 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] In the present invention, glass fibers are modified and uniformly dispersed in a high-density polyethylene matrix. By compounding a flame retardant with the glass fibers, the dispersibility of the flame retardant in the high-density polyethylene matrix is improved, and the strength and flame retardant performance of the high-strength waterproof polyethylene composite material are enhanced.

[0008] The object of the present invention can be achieved through the following technical solutions:

[0009] A high-strength waterproof polyethylene composite material, by mass, comprises the following component raw materials:

[0010] 100 - 120 parts of high-density polyethylene, 20 - 30 parts of polypropylene resin, 1 - 1.2 parts of diisopropylbenzene peroxide, 8 - 10 parts of modified composite glass fibers, 2 - 3 parts of stabilizer, 5 - 6 parts of coupling agent, and 0.3 - 0.4 part of antioxidant.

[0011] The flame-retardant hydroxylated glass fibers are prepared from MOF / hydroxylated glass fibers loaded with an organic flame retardant.

[0012] The MOF / hydroxylated glass fibers are prepared by in-situ generation of MOF on the surface of hydroxylated glass fibers.

[0013] Further, the modified composite glass fibers are prepared by the following steps:

[0014] In a reaction kettle, the flame-retardant hydroxylated glass fibers are mixed with tetrahydrofuran, 10-undecen-1-ol is added at 0 - 5°C, stirred for 10 - 12 h, the precipitate is collected by filtration, the precipitate is washed, and vacuum dried to obtain the modified composite glass fibers.

[0015] Further, the dosage ratio of the flame-retardant hydroxylated glass fibers, tetrahydrofuran, and 10-undecen-1-ol is 8 - 10 g: 100 - 150 mL: 20 - 25 g.

[0016] Further, the stabilizer is one of a composite stabilizer of barium alkylphenate, cadmium oleate, and zinc naphthenate, the coupling agent is one of silane coupling agents KH550, KH560, and KH570, and the antioxidant is antioxidant 1010.

[0017] Further, the flame-retardant hydroxylated glass fibers are prepared by the following steps:

[0018] In a reaction kettle, ammonium polyphosphate is dissolved in deionized water, MOF / hydroxylated glass fibers are added, ultrasonically dispersed, and then heated to 70 - 80°C under stirring conditions. After slowly evaporating the deionized water, the flame-retardant hydroxylated glass fibers are obtained.

[0019] Further, the dosage ratio of ammonium polyphosphate, deionized water, and MOF / hydroxylated glass fibers is 0.5 - 0.6 g: 100 - 120 mL: 8 - 10 g.

[0020] Furthermore, the MOF / hydroxylated glass fiber is prepared by the following steps:

[0021] Disperse the hydroxylated glass fiber in methanol in a reaction kettle, add 2-aminobenzimidazole, heat up to 40 - 50 °C and stir for 30 - 40 min, then add zinc nitrate hexahydrate, stir until dissolved, heat up to 70 - 80 °C and react for 8 - 10 h, filter to obtain a precipitate, wash the precipitate, and dry it under vacuum to obtain the MOF / hydroxylated glass fiber.

[0022] Furthermore, 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.

[0023] Furthermore, the hydroxylated glass fiber is prepared by the following steps:

[0024] Place the glass fiber in a 0.5 - 1 M hydrochloric acid solution in a reaction kettle, heat up to 80 - 90 °C, soak and etch for 6 - 8 h, filter and collect the precipitate, wash the precipitate, and dry it to obtain the hydroxylated glass fiber.

[0025] A preparation method of a high-strength waterproof polyethylene composite material, the preparation method includes the following steps:

[0026] Add high-density polyethylene, polypropylene resin, dicumyl peroxide, modified composite glass fiber, stabilizer, coupling agent, and antioxidant into a high-speed mixer, heat up to 130 - 150 °C, mix at 400 - 500 rpm for 30 - 40 min, extrude and pelletize through an extruder, and the extrusion pressure is 5 - 8 Mpa to obtain the high-strength waterproof polyethylene composite material.

[0027] The beneficial effects of the present invention:

[0028] 1. The high-strength waterproof polyethylene composite material prepared by the present invention uniformly disperses the modified glass fiber in the high-density polyethylene matrix, combines the flame retardant with the glass fiber, improves the dispersion of the flame retardant in the high-density polyethylene matrix, reduces the influence of the flame retardant filler on the mechanical properties of the polyethylene composite material, and improves the strength and flame retardant performance of the high-strength waterproof polyethylene composite material.

[0029] 2. The preparation method of the present invention hydroxylates the surface of glass fiber after acid treatment to increase the hydroxyl content on the surface of glass fiber. Through the hydrogen bond interaction between the hydroxyl group and the amino group on 2-aminobenzimidazole, 2-aminobenzimidazole is evenly grafted on the surface of glass fiber, and then Zn-MOF is in-situ generated on the surface of glass fiber through hydrothermal reaction to obtain MOF / hydroxylated glass fiber with uniform loading. Through the adsorption effect generated by the porous structure of Zn-MOF, the ammonium polyphosphate solution is adsorbed in the porous structure of Zn-MOF to obtain flame-retardant hydroxylated glass fiber with flame-retardant function.

[0030] 3. The preparation method of the present invention grafts long-chain olefins on the surface of glass fiber through the hydrogen bond interaction between 10-undecen-1-ol and amino group to obtain modified composite glass fiber. During the blending process, 10-undecen-1-ol, a long-chain olefin, is cross-linked and grafted with high-density polyethylene under the catalysis of dicumyl peroxide, which can not only improve the dispersion of the modified composite glass fiber in high-density polyethylene, but also improve the bonding effect between the modified composite glass fiber and high-density polyethylene, forming a cross-linked network interface. The interface can act as a medium for stress transfer, play a role in buffering stress, transfer part of the stress to the glass fiber, enhance the strength of high-density polyethylene and effectively relieve the impact on high-density polyethylene, 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 on the performance of the polyethylene composite material in the polyethylene composite material is reduced, further enhancing the strength and flame retardant performance of the polyethylene composite material. Specific Embodiments

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Example 1: A preparation method of a high-strength waterproof polyethylene composite material, comprising the following steps:

[0033] S1. Place the glass fiber in a 0.5M hydrochloric acid solution in a reaction kettle, heat it to 80°C and soak and etch for 6 hours, filter and collect the precipitate, wash the precipitate with deionized water, and dry it at 60°C for 8 hours to obtain hydroxylated glass fiber.

[0034] S2. Disperse 8 g of hydroxylated glass fiber in 100 mL of methanol in a reaction kettle, add 4 g of 2-aminobenzimidazole, heat up to 40 °C and stir for 30 min. Then add 3 g of zinc nitrate hexahydrate to the reaction kettle, stir to dissolve, heat up to 70 °C and react for 8 h. Filter to obtain a precipitate, wash the precipitate with methanol and deionized water, and dry it in vacuum at 60 °C for 8 h to obtain MOF / hydroxylated glass fiber.

[0035] S3. Dissolve 0.5 g of ammonium polyphosphate in 100 mL of deionized water in a reaction kettle, add 8 g of MOF / hydroxylated glass fiber, ultrasonically disperse it, heat up to 70 °C under stirring conditions, slowly evaporate the deionized water, and then place it in an oven at 70 °C for vacuum drying for 8 h to obtain flame-retardant hydroxylated glass fiber.

[0036] S4. Mix 8 g of flame-retardant hydroxylated glass fiber with 100 mL of tetrahydrofuran in a reaction kettle, add 20 g of 10-undecen-1-ol at 0 °C, stir for 10 h, filter to collect the precipitate, wash the precipitate with ethanol, and dry it in vacuum at 60 °C to obtain modified glass fiber.

[0037] S5. Mix 100 g of high-density polyethylene, 20 g of polypropylene resin, 1 g of diisopropylbenzene peroxide, 8 g of modified composite glass fiber, 2 g of barium alkylphenate, 5 g of silane coupling agent KH550, and 0.3 g of antioxidant 1010 in a high-speed mixer at 130 °C and 400 rpm for 30 min, and extrude and pelletize through an extruder with an extrusion pressure of 5 Mpa to obtain a high-strength waterproof polyethylene composite material.

[0038] Example 2: A method for preparing a high-strength waterproof polyethylene composite material, comprising the following steps:

[0039] S1. Place glass fiber in a 0.75 M hydrochloric acid solution in a reaction kettle, heat up to 85 °C, soak and etch for 7 h, filter to collect the precipitate, wash the precipitate with deionized water, and dry it at 65 °C for 9 h to obtain hydroxylated glass fiber.

[0040] S2. Disperse 9 g of hydroxylated glass fiber in 110 mL of methanol in a reaction kettle, add 4.5 g of 2-aminobenzimidazole, heat up to 45 °C and stir for 35 min. Then add 3.5 g of zinc nitrate hexahydrate to the reaction kettle, stir to dissolve, heat up to 75 °C and react for 9 h. Filter to obtain a precipitate, wash the precipitate with methanol and deionized water, and dry it in vacuum at 65 °C for 9 h to obtain MOF / hydroxylated glass fiber.

[0041] S3. Dissolve 0.55 g of ammonium polyphosphate in 110 mL of deionized water in a reaction kettle, add 9 g of MOF / hydroxylated glass fiber, ultrasonically disperse it, heat up to 75 °C under stirring conditions, slowly evaporate the deionized water, and then place it in an oven at 75 °C for vacuum drying for 9 h to obtain flame-retardant hydroxylated glass fiber.

[0042] 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-undecen-1-ol at 2.5 °C, stir for 11 h, filter to collect the precipitate, wash the precipitate with ethanol, and dry it under vacuum at 65 °C to obtain modified glass fiber.

[0043] S5. Mix 110 g of high-density polyethylene, 25 g of polypropylene resin, 1.1 g of diisopropyl peroxide, 9 g of modified composite glass fiber, 2.5 g of cadmium oleate, 5.5 g of silane coupling agent KH560, and 0.35 g of antioxidant 1010 in a high-speed mixer at 140 °C and 450 rpm for 35 min, and extrude and pelletize through an extruder with an extrusion pressure of 6.5 Mpa to obtain a high-strength waterproof polyethylene composite material.

[0044] Example 3: A method for preparing a high-strength waterproof polyethylene composite material, comprising the following steps:

[0045] S1. Place glass fiber in a 1 M hydrochloric acid solution in a reaction kettle, heat up to 90 °C, soak and etch for 8 h, filter to collect the precipitate, wash the precipitate with deionized water, and dry it at 70 °C for 10 h to obtain hydroxylated glass fiber.

[0046] S2. Disperse 10 g of hydroxylated glass fiber in 120 mL of methanol in a reaction kettle, add 5 g of 2-aminobenzimidazole, heat up to 50 °C and stir for 40 min, then add 4 g of zinc nitrate hexahydrate to the reaction kettle, stir to dissolve, heat up to 80 °C and react for 10 h, filter to obtain the precipitate, wash the precipitate with methanol and deionized water, and dry it under vacuum at 70 °C for 10 h to obtain MOF / hydroxylated glass fiber.

[0047] S3. Dissolve 0.6 g of ammonium polyphosphate in 120 mL of deionized water in a reaction kettle, add 10 g of MOF / hydroxylated glass fiber, ultrasonically disperse it, heat up to 80 °C under stirring conditions, slowly evaporate the deionized water, and then place it in an oven at 80 °C for vacuum drying for 10 h to obtain flame-retardant hydroxylated glass fiber.

[0048] S4. Mix 10 g of flame-retardant hydroxylated glass fiber with 150 mL of tetrahydrofuran in a reaction kettle. Add 25 g of 10-undecen-1-ol at 5 °C, stir for 12 h, filter to collect the precipitate, wash the precipitate with ethanol, and dry it under vacuum at 70 °C to obtain modified glass fiber.

[0049] S5. Mix 120 g of high-density polyethylene, 30 g of polypropylene resin, 1.2 g of diisopropylbenzene peroxide, 10 g of modified composite glass fiber, 3 g of zinc naphthenate composite stabilizer, 6 g of silane coupling agent KH570, and 0.4 g of antioxidant 1010 in a high-speed mixer at 150 °C and 500 rpm for 40 min, and then extrude and pelletize through an extruder with an extrusion pressure of 8 Mpa to obtain a high-strength waterproof polyethylene composite material.

[0050] Principle of the invention:

[0051] In the present invention, the surface of the glass fiber is acid-treated and hydroxylated to increase the hydroxyl content on the surface of the glass fiber. Through the hydrogen bond formation between the hydroxyl group and the amino group on 2-aminobenzimidazole, 2-aminobenzimidazole is evenly grafted onto the surface of the glass fiber. Then, through a hydrothermal reaction, Zn-MOF is in-situ generated on the surface of the glass fiber to obtain uniformly loaded MOF / hydroxylated glass fiber. Through the adsorption effect generated by the porous structure of Zn-MOF, ammonium polyphosphate solution is adsorbed in the porous structure of Zn-MOF to obtain flame-retardant hydroxylated glass fiber with flame-retardant function.

[0052] By grafting long-chain olefins onto the surface of the glass fiber through the hydrogen bond between 10-undecen-1-ol and the amino group, modified composite glass fiber is obtained. During the blending process, the long-chain olefin 10-undecen-1-ol is cross-linked and grafted with high-density polyethylene under the catalysis of diisopropylbenzene peroxide, which can not only improve the dispersion of the modified composite glass fiber in high-density polyethylene, but also improve the bonding effect between the modified composite glass fiber and high-density polyethylene, forming a cross-linked network interface. The interface can act as a medium for stress transfer, playing a role in buffering stress, transferring part of the stress to the glass fiber, enhancing the strength of high-density polyethylene and effectively alleviating the impact on high-density polyethylene, and improving the strength of the polyethylene composite material.

[0053] By loading the flame retardant on the modified composite glass fiber, the influence of the flame retardant on the performance of the polyethylene composite material is reduced, and the strength and flame retardant performance of the polyethylene composite material are further improved.

[0054] Comparative Example 1: The difference from Example 1 is that in S3, hydroxylated glass fiber is used to replace MOF / hydroxylated glass fiber to prepare a polyethylene composite material.

[0055] Comparative Example 2: The difference from Example 1 is that in S4, MOF / hydroxylated glass fiber and ammonium polyphosphate are used to replace flame-retardant hydroxylated glass fiber to prepare a polyethylene composite material.

[0056] Comparative Example 3: The difference from Example 1 is that in S5, flame-retardant hydroxylated glass fiber is used to replace the modified composite glass fiber to prepare a polyethylene composite material.

[0057] The sources of some chemical reagents in the examples and comparative examples are as follows:

[0058] The diameter of the glass fiber is 10 - 15 μm, and the length is 0.6 - 0.8 mm.

[0059] 10 - undecen - 1 - ol was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.

[0060] The remaining reagents were all commercially available.

[0061] The polyethylene composites prepared in Examples 1 - 3 and Comparative Examples 1 - 3 were heated and melted and then extruded and plasticized. After being molded by die pressing, double - wall corrugated pipes with a DN / OD of 315 were prepared. The melting temperature was 180 °C, the extrusion pressure was 12 MPa, and the traction speed of the extruded pipe was 2 m / min. The performance of the prepared double - wall corrugated pipes was tested;

[0062] Place the double - wall corrugated pipe horizontally and determine the compression speed of the flat plate according to the diameter of the pipe. Apply pressure to the specimen in the vertical direction with two parallel flat plates. When deformed, a reaction force is generated. Calculate the ring stiffness with the force value when the deformation amount in the diameter direction of the pipe specimen cross - section is 0.03di: The definition of the ring stiffness is S = EI / D 3 (kN / m 2 ).

[0063] In the formula, E is the elastic modulus of the material; I is the moment of inertia; D is the average diameter of the pipe.

[0064] Its calculation formula is: S i =(0.0186 + 0.02Y i / d i )・F i / L i YY i

[0065] 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 (kN) when the deformation of the pipe diameter is 3%; L i is the specimen length (m); Y i is the deformation amount (m), the deformation amount when the pipe deformation is 3.0%, such as Y i / d i =0.03.

[0066] According to the standard GB / T 9647 - 2015, under the specified downward pressure speed, press down 30% of the average outer wall of the pipe, and observe whether the pipe is damaged and there is no reverse bending.

[0067] According to the standard GB / T 2406.1-2008 Plastics - Determination of burning behaviour by oxygen index - Part 1: General method, the limiting oxygen index was determined.

[0068] The results are shown in Table 1: Table 1: Performance test results of double - wall corrugated pipe specimens

[0069]

[0070] It can be seen from Table 1 that the double - wall corrugated pipe prepared from the high - strength waterproof polyethylene composite material of the present invention has high ring stiffness and good ring flexibility, and has good flame - retardant performance.

[0071] In Comparative Example 1, since Zn - MOF was not synthesized on the surface of hydroxylated glass fiber, the degree and strength of the combination of the flame retardant and hydroxylated glass fiber were relatively low, and the improvement of the strength and flame - retardant performance of the polyethylene composite material was small.

[0072] In Comparative Example 2, since ammonium polyphosphate is difficult to dissolve in organic solvents, the adsorption capacity of MOF / hydroxylated glass fiber for large - particle ammonium polyphosphate is weak, and the dispersibility and binding strength of the flame retardant in the obtained modified composite glass fiber are relatively low. During the melt - blending process, the flame retardant is likely to fall off from the surface of the glass fiber, and the flame - retardant performance and strength of the prepared polyethylene composite material are low.

[0073] In Comparative Example 3, since the flame - retardant hydroxylated glass fiber was not modified, the flame - retardant hydroxylated glass fiber was only dispersed and combined with high - density polyethylene under the action of a coupling agent, and it was difficult to form a cross - linked network, and the ring flexibility and ring stiffness were poor.

[0074] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A high-strength waterproof polyethylene composite material, characterized in that, By mass parts, it includes the following component 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: Mix the flame - retardant hydroxylated glass fiber with tetrahydrofuran in a reaction kettle, add 10 - undecene - 1 - ol at 0 - 5°C, stir for 10 - 12 h, filter to collect the precipitate, wash the precipitate, and vacuum - dry to obtain the 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; Specifically, the flame - retardant hydroxylated glass fiber is prepared by the following steps: Dissolve ammonium polyphosphate in deionized water in a reaction kettle, add MOF / hydroxylated glass fiber, after ultrasonic dispersion, heat to 70 - 80°C under stirring conditions, slowly evaporate the deionized water to obtain the flame - retardant hydroxylated glass fiber; Specifically, the MOF / hydroxylated glass fiber is prepared by the following steps: Disperse hydroxylated glass fiber in methanol in a reaction kettle, add 2 - aminobenzimidazole, heat to 40 - 50°C and stir for 30 - 40 min, then add zinc nitrate hexahydrate, stir to dissolve and then heat to 70 - 80°C and react for 8 - 10 h, filter to obtain the precipitate, wash the precipitate, and vacuum - dry to obtain MOF / hydroxylated glass fiber.

2. The high-strength waterproof polyethylene composite material according to claim 1, characterized in that, The dosage 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 the composite stabilizers of barium alkylphenate, cadmium oleate and zinc naphthenate, the coupling agent is one of the silane coupling agents KH550, KH560 and KH570, and the antioxidant is antioxidant 1010.

4. A high-strength waterproof polyethylene composite material according to claim 1, characterized in that, The dosage ratio of ammonium polyphosphate, deionized water and MOF / hydroxylated glass fiber is 0.5 - 0.6 g: 100 - 120 mL: 8 - 10 g.

5. A high-strength waterproof polyethylene composite material according to claim 1, characterized in that, The dosage 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.

6. The high-strength waterproof polyethylene composite material according to claim 5, wherein, The hydroxylated glass fiber is prepared by the following steps: Place the glass fiber in a 0.5 - 1 M hydrochloric acid solution in a reaction kettle, heat to 80 - 90°C and soak and etch for 6 - 8 h, filter to collect the precipitate, wash the precipitate, and dry to obtain the hydroxylated glass fiber.

7. The preparation method of a high-strength waterproof polyethylene composite material according to claim 1, characterized in that, The preparation method includes the following steps: Add high - density polyethylene, polypropylene resin, dicumyl peroxide, modified composite glass fiber, stabilizer, coupling agent and antioxidant into a high - speed mixer, heat to 130 - 150°C, mix at 400 - 500 rpm for 30 - 40 min, and extrude and pelletize through an extruder, with an extrusion pressure of 5 - 8 Mpa, to obtain a high - strength waterproof polyethylene composite material.

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