Preparation method of anti-aging high-density polyethylene composite material for pipelines

Abstract

The invention relates to the technical field of polyethylene, and discloses a preparation method of an anti-aging high-density polyethylene composite material for pipelines, which comprises the following steps: uniformly mixing polyethylene, POE (Polyolefin Elastomer), styrene, a functionalized hindered amine light stabilizer, functionalized silver-loaded zinc oxide whiskers and the like, and grafting a functionalized auxiliary agent into a matrix material under the initiation of an initiator, thereby obtaining the anti-aging high-density polyethylene composite material for pipelines. The anti-aging high-density polyethylene composite material for the pipeline is prepared by the following steps of: adding an inorganic whisker material, reducing the precipitation effect of the inorganic whisker material, improving the compatibility of the whisker and a matrix material, and uniformly dispersing the whisker in the matrix material. The polyethylene composite material prepared by the invention has excellent long-acting antibacterial property, mechanical property and anti-aging property, and can be used for preparing the anti-aging high-density polyethylene composite material for the pipeline. Wide application prospects are realized in the field of pipes.

Description

Technical Field

[0001] The invention relates to the technical field of polyethylene, in particular to a method for preparing an anti-aging high-density polyethylene composite material for pipelines. Background Art

[0002] High-density polyethylene (HDPE) is a corrosion-resistant, easy-to-process, and moisture-permeable thermoplastic material. It is one of the commonly used materials for pipes. However, HDPE has poor mechanical properties, low hardness, and poor aging resistance. Especially when used as a pipe material, it is prone to aging, discoloration, and cracking when exposed to outdoor conditions for a long time. Pores and cracks appear on the surface, the color turns yellow or fades, and the mechanical properties deteriorate, thereby shortening its service life.

[0003] Ethylene-1-octene copolymer (POE) is a thermoplastic elastomer with good toughness. Adding it to polyethylene as a toughening agent can enhance the overall performance of the composite material. Zinc oxide whiskers, with a three-dimensional, four-needle structure, possess high strength and antimicrobial activity. However, if added directly to the resin, the interfacial bonding between the matrix and the whiskers is weak, the zinc oxide whiskers disperse poorly in the resin, and agglomeration is severe, necessitating modification.

[0004] For example, patent publication number CN 110372941 B discloses a high-density polyethylene pipe and a method for preparing the same. This invention uses high-density polyethylene, four-needle zinc oxide whiskers, a plasticizer, an anti-aging agent, and other raw materials to produce a high-density polyethylene pipe with excellent crack resistance. However, the polyethylene pipe is susceptible to bacterial erosion during long-term use, resulting in a reduced service life. This invention does not address this problem.

[0005] Based on this, the present invention provides a method for preparing an anti-aging high-density polyethylene composite material for pipelines. Summary of the Invention

[0006] (1) Technical problems solved

[0007] In response to the shortcomings of the existing technology, the present invention provides a method for preparing an anti-aging high-density polyethylene composite material for pipelines. The prepared composite material has good mechanical properties, anti-aging properties and long-term antibacterial properties, and has broad application prospects in the field of pipes.

[0008] (2) Technical solution

[0009] A method for preparing an anti-aging high-density polyethylene composite material for pipelines, the method comprising the following steps:

[0010] Polyethylene, POE, styrene, a functionalized hindered amine light stabilizer, a functionalized silver-loaded zinc oxide whisker, paraffin wax, and dicumyl peroxide are uniformly mixed, the mixed mixture is fed into a twin-screw extruder, extruded into granules, and then placed in an injection molding machine for injection molding to obtain an anti-aging high-density polyethylene composite material for pipes, wherein dicumyl peroxide is used as an initiator, styrene is used as a grafting-promoting comonomer, POE is a toughening agent, and PP is a grafting matrix. The alkenyl groups contained in the functionalized hindered amine light stabilizer and the functionalized silver-loaded zinc oxide whisker are grafted with the matrix to obtain an anti-aging high-density polyethylene composite material for pipes.

[0011] Further preferably, the weight ratio of the polyethylene, POE, styrene, functionalized hindered amine light stabilizer, functionalized silver-loaded zinc oxide whisker, paraffin wax, and dicumyl peroxide is 100:5-10:1-2:0.3-0.6:8-10:1-2:0.3-0.5.

[0012] Preferably, the temperatures in each zone of the extruder are 130°C, 160°C, 170°C, 180°C, 185°C, 190°C, 185°C, and 180°C, the head temperature is 170°C, and the rotation speed is 50 rpm.

[0013] Preferably, the preparation method of the functionalized hindered amine light stabilizer comprises the following steps:

[0014] Methyl cinnamate, 2,2,6,6-tetramethylpiperidinol, and tetrabutyl titanate are added to toluene, and the mixture is protected by nitrogen and magnetically stirred at 100-110°C for 8-10 hours. After the reaction, the mixture is distilled under reduced pressure and recrystallized from petroleum ether to obtain a functionalized hindered amine light stabilizer, wherein the amount ratio of methyl cinnamate to 2,2,6,6-tetramethylpiperidinol is (1-1.2) g:1 g. In this reaction, methyl cinnamate and 2,2,6,6-tetramethylpiperidinol are catalyzed by tetrabutyl titanate to obtain a functionalized hindered amine light stabilizer, which contains not only a methyl cinnamate structure with antibacterial effect, but also a hindered amine anti-aging structure and an active olefinic structure:

[0015] ;

[0016] Preferably, the method for preparing the functionalized silver-loaded zinc oxide whiskers comprises the following steps:

[0017] (1) Using acetic acid to adjust the pH of a 90% ethanol aqueous solution to 4, then adding γ-methacryloxypropyltrimethoxysilane, stirring and hydrolyzing for 20-40 minutes at room temperature, adding dried tetrapod-shaped zinc oxide whiskers, heating to 55-65 ° C, magnetic stirring for 2-4 hours, vacuum distillation, washing 3-5 times with a 50% ethanol aqueous solution, and drying to obtain functionalized zinc oxide whiskers. In this reaction, the silanol group generated by the hydrolysis of γ-methacryloxypropyltrimethoxysilane is condensed with the hydroxyl group on the surface of the zinc oxide whiskers, and the organic group at the other end is grafted onto the resin matrix to form a "whisker-coupling agent-resin" system, so that a good interface bonding is generated between the three, which is beneficial to improving the mechanical properties;

[0018] (2) Add the functionalized zinc oxide whiskers to deionized water, stir and disperse them, add NaOH, SnCl2, and KNaC4H4O6·4H2O thereto, stir magnetically for 1-2 hours at room temperature, filter, wash, and dry to obtain powder; add concentrated hydrochloric acid and PbCl2 to deionized water, stir and mix evenly, add the above powder to it, heat in a water bath at 30°C, stir magnetically for 1-2 hours, filter, wash, and dry to obtain activated zinc oxide whiskers;

[0019] (3) Add activated zinc oxide whiskers, silver nitrate, and formaldehyde to ammonia water, stir magnetically for 1-2 hours at room temperature, filter, wash, and dry to obtain functionalized silver-loaded zinc oxide whiskers. In this reaction, Pb particles are used as catalysts to reduce silver ions to silver. Metallic silver is deposited on the surface of zinc oxide whiskers by chemical deposition, that is, zinc oxide whiskers are used as cores and the surface is coated with a silver particle layer. When it is added to the matrix material, on the one hand, the generation of dispersed protruding silver particles on the surface of the whiskers can increase the roughness of the surface of the zinc oxide whiskers, so that mechanical riveting occurs between the whiskers and the matrix. Improve the enhancement and modification effect. On the other hand, zinc oxide whiskers and silver are both inorganic antibacterial particles. (Zinc oxide whiskers can not only pierce the bacterial cell membrane through their sharp structure to cause the outflow of bacterial contents, but also produce active oxygen through photocatalysis to destroy the bacterial cell membrane and cause cell death, thereby achieving the antibacterial purpose; silver can produce silver ions and combine with -SH and other groups on the cell membrane to increase the permeability of the membrane, causing the leakage of intracellular substances, thereby achieving the purpose of contact antibacterial). The two can synergistically improve the antibacterial properties of the base material. Applying them in pipeline materials can increase the service life of the pipeline materials.

[0020] Further preferably, in (1), the amount of γ-methacryloxypropyltrimethoxysilane used is 10-15% of the mass of the tetrapod-shaped zinc oxide whiskers.

[0021] Further preferably, in (2), the usage ratio of the functionalized zinc oxide whisker, NaOH, SnCl2, and KNaC4H4O6·4H2O is 1 g: (2.8-3) g: (1.8-2) g: (2.8-3) g.

[0022] Further preferably, in (3), the ratio of activated zinc oxide whiskers, silver nitrate, and formaldehyde is 1 g: (2-2.2) g: (1-1.2) mL.

[0023] (3) Beneficial technical effects

[0024] The present invention loads silver onto zinc oxide whiskers, and then utilizes the alkenyl structure contained in the surface of the functionalized zinc oxide whiskers to graft onto a base material. On the one hand, the functionalized zinc oxide whiskers can be uniformly dispersed in the base resin and have a skeleton function in the base material. The zinc oxide whiskers are four-needle-shaped. When subjected to external stress, the stress exerted on one whisker is transmitted to the other three whiskers, and energy is absorbed and transmitted through stress dispersion, thereby improving the mechanical properties of the base material. On the other hand, the zinc oxide whiskers prepared by the present invention contain more double bond structures after the modified surface, and can generate more chemical bonds with the base material. When the stress is dispersed to the whiskers, the excess stress can be dispersed to other whiskers or molecular chains through molecular chains, thereby achieving the purpose of improving the mechanical properties of the base material. On the other hand, the zinc oxide whiskers have good anti-ultraviolet aging effect, and form an organic-inorganic synergistic anti-aging structure with the organic hindered amine anti-oxidation aging structure, thereby jointly improving the anti-aging performance of the material. In addition, the present invention utilizes zinc oxide whiskers to load silver to form a long-lasting antibacterial combination, and adding the silver whiskers to the material can enhance the antibacterial properties of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the SEM image of the functionalized silver-loaded zinc oxide whiskers of Example 1. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, 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 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 making creative efforts shall fall within the scope of protection of the present invention.

[0027] Preparation Example 1

[0028] (1) The pH of a 90% ethanol aqueous solution was adjusted to 4 using acetic acid, and then 1.5 g of γ-methacryloyloxypropyltrimethoxysilane was added. The mixture was stirred and hydrolyzed at room temperature for 40 min. 15 g of dried tetrapod-shaped zinc oxide whiskers was added, and the mixture was heated to 60 °C and magnetically stirred for 4 h. The mixture was distilled under reduced pressure, washed five times with a 50% ethanol aqueous solution, and dried to obtain functionalized zinc oxide whiskers.

[0029] (2) Add 12 g of functionalized zinc oxide whiskers to deionized water and stir to disperse. Add 33.6 g of NaOH, 21.6 g of SnCl2, and 33.6 g of KNaC4H4O6·4H2O to the mixture. Stir magnetically at room temperature for 2 h. Filter, wash, and dry to obtain powder. Add 2 mL of concentrated hydrochloric acid and 0.2 g of PbCl2 to 500 mL of deionized water and stir to mix evenly. Add the above powder to the mixture. Heat in a water bath at 30 °C and stir magnetically for 1 h. Filter, wash, and dry to obtain activated zinc oxide whiskers.

[0030] (3) Add 10 g of activated zinc oxide whiskers, 20 g of silver nitrate, and 10 mL of formaldehyde to 40 mL of ammonia water and stir magnetically at room temperature for 2 h. After stirring, filter, wash, and dry to obtain functionalized silver-loaded zinc oxide whiskers.

[0031] (4) 1 g of methyl cinnamate, 1 g of 2,2,6,6-tetramethylpiperidinol, and 0.1 mL of tetrabutyl titanate were added to toluene, and the mixture was protected by nitrogen and magnetically stirred at 105 °C for 8 h. After the reaction, the mixture was distilled under reduced pressure and recrystallized from petroleum ether to obtain a functionalized hindered amine light stabilizer.

[0032] (5) 100 g of polyethylene, 5 g of POE, 2 g of styrene, 0.3 g of functionalized hindered amine light stabilizer, 8 g of functionalized silver-loaded zinc oxide whiskers, 2 g of paraffin wax, and 0.3 g of diisopropylbenzene peroxide were mixed evenly, and the mixed mixture was fed into a twin-screw extruder for extrusion granulation. The temperatures of each zone of the extruder were 130°C, 160°C, 170°C, 180°C, 185°C, 190°C, 185°C, and 180°C, the head temperature was 170°C, and the speed was 50 rpm. The mixture was then placed in an injection molding machine for injection molding at an injection molding temperature of 180°C to obtain an anti-aging high-density polyethylene composite material for pipes.

[0033] During the melt blending process, free radicals are generated by the decomposition of dicumyl peroxide, which triggers a chemical reaction between the double bonds contained in the energetic hindered amine light stabilizer and the functionalized silver-loaded zinc oxide whiskers and the matrix material, thereby producing a chemical bond between the functionalized additive and the matrix, strengthening the interfacial interaction between the whiskers and antioxidant structure and the matrix, increasing the interfacial compatibility, and thus significantly improving the performance of the composite material.

[0034] Preparation Example 2

[0035] (1) Use acetic acid to adjust the pH of 90% ethanol aqueous solution to 4, then add 2g of γ-methacryloyloxypropyltrimethoxysilane, stir and hydrolyze at room temperature for 20min, add 15g of dry tetrapod-shaped zinc oxide whiskers, heat to 65℃, stir magnetically for 2h, distill under reduced pressure, wash three times with 50% ethanol aqueous solution, and dry to obtain functionalized zinc oxide whiskers.

[0036] (2) Add 12 g of functionalized zinc oxide whiskers to deionized water and stir to disperse. Add 34 g of NaOH, 23 g of SnCl2, and 34 g of KNaC4H4O6·4H2O to the water and stir magnetically for 2 h at room temperature. Filter, wash, and dry to obtain powder. Add 2 mL of concentrated hydrochloric acid and 0.2 g of PbCl2 to 500 mL of deionized water and stir to mix evenly. Add the above powder to the water and heat in a water bath at 30 °C. Stir magnetically for 2 h. Filter, wash, and dry to obtain activated zinc oxide whiskers.

[0037] (3) Add 10 g of activated zinc oxide whiskers, 22 g of silver nitrate, and 11 mL of formaldehyde to 40 mL of ammonia water and stir magnetically for 2 h at room temperature. After stirring, filter, wash, and dry to obtain functionalized silver-loaded zinc oxide whiskers.

[0038] (4) 1.2 g of methyl cinnamate, 1 g of 2,2,6,6-tetramethylpiperidinol, and 0.1 mL of tetrabutyl titanate were added to toluene, and the mixture was protected by nitrogen and magnetically stirred at 100 °C for 10 h. After the reaction, the mixture was distilled under reduced pressure and recrystallized from petroleum ether to obtain a functionalized hindered amine light stabilizer.

[0039] (5) 100 g of polyethylene, 5 g of POE, 1 g of styrene, 0.4 g of functionalized hindered amine light stabilizer, 8.5 g of functionalized silver-loaded zinc oxide whiskers, 1 g of paraffin wax, and 0.4 g of diisopropylbenzene peroxide were mixed evenly, and the mixed mixture was fed into a twin-screw extruder for extrusion granulation. The temperatures of each zone of the extruder were 130°C, 160°C, 170°C, 180°C, 185°C, 190°C, 185°C, and 180°C, the head temperature was 170°C, and the speed was 50 rpm. The mixture was then placed in an injection molding machine for injection molding at an injection molding temperature of 180°C to obtain an anti-aging high-density polyethylene composite material for pipes.

[0040] Preparation Example 3

[0041] (1) Use acetic acid to adjust the pH of 90% ethanol aqueous solution to 4, then add 2.2 g of γ-methacryloyloxypropyltrimethoxysilane, stir and hydrolyze at room temperature for 30 min, add 15 g of dried tetrapod-shaped zinc oxide whiskers, heat to 55 ° C, magnetically stir for 4 h, distill under reduced pressure, wash four times with 50% ethanol aqueous solution, and dry to obtain functionalized zinc oxide whiskers.

[0042] (2) Add 12 g of functionalized zinc oxide whiskers to deionized water and stir to disperse. Add 35 g of NaOH, 23 g of SnCl2, and 35 g of KNaC4H4O6·4H2O to the water. Stir magnetically at room temperature for 1 h. Filter, wash, and dry to obtain powder. Add 2 mL of concentrated hydrochloric acid and 0.2 g of PbCl2 to 500 mL of deionized water and stir to mix evenly. Add the above powder to the water. Heat in a water bath at 30 °C and stir magnetically for 1 h. Filter, wash, and dry to obtain activated zinc oxide whiskers.

[0043] (3) Add 10 g of activated zinc oxide whiskers, 21 g of silver nitrate, and 12 mL of formaldehyde to 40 mL of ammonia water and stir magnetically for 1 h at room temperature. After stirring, filter, wash, and dry to obtain functionalized silver-loaded zinc oxide whiskers.

[0044] (4) 1.2 g of methyl cinnamate, 1 g of 2,2,6,6-tetramethylpiperidinol, and 0.1 mL of tetrabutyl titanate were added to toluene, and the mixture was protected by nitrogen and magnetically stirred at 110 °C for 8 h. After the reaction, the mixture was distilled under reduced pressure and recrystallized from petroleum ether to obtain a functionalized hindered amine light stabilizer.

[0045] (5) 100 g of polyethylene, 8 g of POE, 1 g of styrene, 0.5 g of functionalized hindered amine light stabilizer, 9 g of functionalized silver-loaded zinc oxide whiskers, 2 g of paraffin wax, and 0.5 g of diisopropylbenzene peroxide were mixed evenly, and the mixed mixture was fed into a twin-screw extruder for extrusion granulation. The temperatures of each zone of the extruder were 130°C, 160°C, 170°C, 180°C, 185°C, 190°C, 185°C, and 180°C, the head temperature was 170°C, and the speed was 50 rpm. The mixture was then placed in an injection molding machine for injection molding at an injection molding temperature of 180°C to obtain an anti-aging high-density polyethylene composite material for pipes.

[0046] Preparation Example 4

[0047] (1) Use acetic acid to adjust the pH of 90% ethanol aqueous solution to 4, then add 2.25g of γ-methacryloxypropyltrimethoxysilane, stir and hydrolyze at room temperature for 30min, add 15g of dried tetrapod-shaped zinc oxide whiskers, heat to 60℃, stir magnetically for 4h, distill under reduced pressure, wash 5 times with 50% ethanol aqueous solution, and dry to obtain functionalized zinc oxide whiskers.

[0048] (2) Add 12 g of functionalized zinc oxide whiskers to deionized water and stir to disperse. Add 36 g of NaOH, 24 g of SnCl2, and 36 g of KNaC4H4O6·4H2O to the mixture and stir magnetically for 1 h at room temperature. Filter, wash, and dry to obtain powder. Add 2 mL of concentrated hydrochloric acid and 0.2 g of PbCl2 to 500 mL of deionized water and stir to mix evenly. Add the above powder to the mixture and heat in a water bath at 30 °C. Stir magnetically for 2 h. Filter, wash, and dry to obtain activated zinc oxide whiskers.

[0049] (3) Add 10 g of activated zinc oxide whiskers, 22 g of silver nitrate, and 10 mL of formaldehyde to 40 mL of ammonia water and stir magnetically for 2 h at room temperature. After stirring, filter, wash, and dry to obtain functionalized silver-loaded zinc oxide whiskers.

[0050] (4) 1.2 g of methyl cinnamate, 1 g of 2,2,6,6-tetramethylpiperidinol, and 0.1 mL of tetrabutyl titanate were added to toluene, and the mixture was protected by nitrogen and magnetically stirred at 100 °C for 9 h. After the reaction, the mixture was distilled under reduced pressure and recrystallized from petroleum ether to obtain a functionalized hindered amine light stabilizer.

[0051] (5) 100 g of polyethylene, 10 g of POE, 2 g of styrene, 0.6 g of functionalized hindered amine light stabilizer, 10 g of functionalized silver-loaded zinc oxide whiskers, 2 g of paraffin wax, and 0.5 g of diisopropylbenzene peroxide were mixed evenly, and the mixed mixture was fed into a twin-screw extruder for extrusion granulation. The temperatures of each zone of the extruder were 130°C, 160°C, 170°C, 180°C, 185°C, 190°C, 185°C, and 180°C, the head temperature was 170°C, and the speed was 50 rpm. The mixture was then placed in an injection molding machine for injection molding at an injection molding temperature of 180°C to obtain an anti-aging high-density polyethylene composite material for pipes.

[0052] Comparative Example 1

[0053] The steps for preparing the anti-aging high-density polyethylene composite material for pipes in this comparative example are roughly the same as those in Preparation Example 1, except that nano zinc oxide is used instead of tetrapod-shaped zinc oxide whiskers in step (1).

[0054] Comparative Example 2

[0055] The steps for preparing the anti-aging high-density polyethylene composite material for pipelines in this comparative example are roughly the same as those in Preparation Example 1, except that: functionalized silver-loaded zinc oxide whiskers are not contained in step (5).

[0056] Comparative Example 3

[0057] The steps for preparing the anti-aging high-density polyethylene composite material for pipelines in this comparative example are roughly the same as those in Preparation Example 1, except that: the functionalized hindered amine light stabilizer is not contained in step (5).

[0058] With reference to GB / T16422.2-2022, the samples were artificially aged for 60 days using a xenon lamp testing machine. The aging performance change rate (%) = (performance after aging - performance before aging) / performance before aging × 100%.

[0059] Use an impact testing machine to test the impact properties of the material.

[0060] Table 1:

[0061]

[0062] As can be seen from the table, Comparative Example 2 does not contain functionalized silver-loaded zinc oxide whiskers, so its mechanical properties are the worst. Comparative Example 1 uses nano zinc oxide instead of four-needle zinc oxide whiskers in step 1, and its mechanical properties are not as good as those of Preparation Example 1. This is because zinc oxide whiskers are four-needle. When subjected to external stress, the stress on one of the whiskers will be transferred to the other three whiskers, absorbing and transmitting energy through stress dispersion. That is, the external stress borne by the matrix can be effectively transferred to the whiskers through the interface, thereby exerting the reinforcing effect of the whiskers. Spherical nano zinc oxide whiskers do not have such advantages, and their stress transfer efficiency is lower than that of whiskers. Therefore, when the addition amount is the same, the impact strength of the whisker material is higher than that of the nano material. Comparative Example 3 contains functionalized silver-loaded zinc oxide whiskers, so its mechanical properties are better than those of Comparative Examples 1 and 2, but its mechanical properties are not as good as those of Example 1. This is because Comparative Example 3 does not contain functionalized hindered amine light stabilizer. This structure contains a rigid benzene ring structure and can also absorb more impact energy. It can be seen from Preparation Examples 1-4 that as the amount of functionalized silver-loaded zinc oxide whiskers and functionalized hindered amine light stabilizer increases, the mechanical properties increase and can reach a maximum of 61.6 MPa.

[0063] The smaller the absolute value of the aging performance change rate, the better the anti-aging performance. After 60 days of aging, it can be seen from the table that the composite material prepared by the present invention has good anti-aging performance.

[0064] Refer to GB / T 31402-2023 to test the antibacterial rate, and the test bacteria is Escherichia coli;

[0065] The material was immersed in deionized water at 55°C and stirred. The deionized water was replaced every 12 hours and the antibacterial performance test was conducted after 30 days.

[0066] Table 2:

[0067]

[0068] It can be seen from the table that the polyethylene composite material prepared by the present invention has excellent antibacterial properties and still has a long-lasting antibacterial effect after flushing for one month.

[0069] In summary, the anti-aging high-density polyethylene composite material for pipelines prepared in the present invention has excellent long-term antibacterial properties, mechanical properties and anti-aging properties.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for preparing an anti-aging high-density polyethylene composite material for pipelines, characterized in that: The preparation method comprises the following steps: Polyethylene, POE, styrene, functionalized hindered amine light stabilizer, functionalized silver-loaded zinc oxide whiskers, paraffin wax, and dicumyl peroxide are uniformly mixed, the mixed mixture is fed into a twin-screw extruder, extruded into granules, and then placed in an injection molding machine for injection molding to obtain an anti-aging high-density polyethylene composite material for pipes.

2. The method for preparing the anti-aging high-density polyethylene composite material for pipelines according to claim 1, characterized in that: The weight ratio of the polyethylene, POE, styrene, functionalized hindered amine light stabilizer, functionalized silver-loaded zinc oxide whisker, paraffin wax, and dicumyl peroxide is 100:5-10:1-2:0.3-0.6:8-10:1-2:0.3-0.

5.

3. The method for preparing the anti-aging high-density polyethylene composite material for pipelines according to claim 1, characterized in that: The temperatures of each zone of the extruder are 130° C., 160° C., 170° C., 180° C., 185° C., 190° C., 185° C., and 180° C., the head temperature is 170° C., and the rotation speed is 50 rpm.

4. The method for preparing the anti-aging high-density polyethylene composite material for pipelines according to claim 1, characterized in that: The preparation method of the functionalized hindered amine light stabilizer comprises the following steps: Methyl cinnamate, 2,2,6,6-tetramethylpiperidinol and tetrabutyl titanate were added to toluene, and the mixture was protected by nitrogen and magnetically stirred at 100-110° C. for 8-10 hours. After the reaction, the mixture was distilled under reduced pressure and recrystallized from petroleum ether to obtain a functionalized hindered amine light stabilizer.

5. The method for preparing the anti-aging high-density polyethylene composite material for pipelines according to claim 4, characterized in that: The usage ratio of the methyl cinnamate and 2,2,6,6-tetramethylpiperidinol is (1-1.2) g:1 g.

6. The method for preparing the anti-aging high-density polyethylene composite material for pipelines according to claim 1, characterized in that: The preparation method of the functionalized silver-loaded zinc oxide whiskers comprises the following steps: (1) Using acetic acid to adjust the pH of a 90% ethanol aqueous solution to 4, then adding γ-methacryloxypropyltrimethoxysilane, stirring and hydrolyzing for 20-40 minutes at room temperature, adding dried tetrapod-shaped zinc oxide whiskers, heating to 55-65°C, magnetically stirring for 2-4 hours, and distilling under reduced pressure. Washing with a 50% ethanol aqueous solution for 3-5 times and drying to obtain functionalized zinc oxide whiskers; (2) Add the functionalized zinc oxide whiskers to deionized water, stir and disperse, add NaOH, SnCl2, KNaC4H4O6·4H2O, stir magnetically for 1-2 hours at room temperature, filter, wash, and dry to obtain powder; add concentrated hydrochloric acid and PbCl2 to deionized water, stir and mix evenly, and add the above powder to it. Heat in a water bath at 30°C, stir magnetically for 1-2 hours, filter, wash, and dry to obtain activated zinc oxide whiskers; (3) Add activated zinc oxide whiskers, silver nitrate, and formaldehyde to ammonia water and stir magnetically for 1-2 hours at room temperature. After the stirring, filter, wash, and dry to obtain functionalized silver-loaded zinc oxide whiskers.

7. The method for preparing the anti-aging high-density polyethylene composite material for pipelines according to claim 6, characterized in that: In the above (1), the amount of γ-methacryloxypropyltrimethoxysilane used is 10-15% of the mass of the tetrapod-shaped zinc oxide whiskers.

8. The method for preparing the anti-aging high-density polyethylene composite material for pipelines according to claim 6, characterized in that: In the above (2), the usage ratio of functionalized zinc oxide whiskers, NaOH, SnCl2, and KNaC4H4O6·4H2O is 1g:(2.8-3)g:(1.8-2)g:(2.8-3)g.

9. The method for preparing the anti-aging high-density polyethylene composite material for pipelines according to claim 6, characterized in that: In the above (3), the usage ratio of activated zinc oxide whiskers, silver nitrate and formaldehyde is 1 g: (2-2.2) g: (1-1.2) mL.

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