A high-density polyethylene composite additive and its preparation method

Abstract

This application relates to the technical field of polyethylene composite additives, and specifically relates to a high-density polyethylene composite additive and a preparation method thereof. The high-density polyethylene composite additive of this application includes an anti-aging agent, a fluoropolymer, and an antistatic agent. Among them, the anti-aging agent is a microcapsule with an antioxidant as the core and a urea-formaldehyde resin doped with nano-titanium dioxide and nano-silica as the shell. The formation of the microcapsule is beneficial to improving the dispersibility and stability of the antioxidant, nano-titanium dioxide, and nano-silica, thereby being beneficial to improving the anti-aging performance of high-density polyethylene. After mixing the anti-aging agent, the fluoropolymer, and the antistatic agent, extrusion granulation is carried out to make composite additive particles. When added to high-density polyethylene, it can improve the dispersibility of the composite additive in high-density polyethylene and reduce the agglomeration phenomenon caused by uneven mixing when each additive is added separately.

Description

Technical Field

[0001] This application relates to the technical field of polyethylene composite additives, and specifically relates to a high-density polyethylene composite additive and a preparation method thereof. Background Art

[0002] High-density polyethylene is a crystalline polymer material with low price and excellent mechanical properties. At room temperature, it is insoluble in organic solvents, resistant to the corrosion of acids, alkalis and salts, has stable chemical properties, good wear resistance, electrical insulation, toughness and cold resistance, and is mainly applied in the fields of packaging, construction, wire and cable, pipelines, etc. However, high-density polyethylene materials are easily affected by factors such as light, heat, and oxygen during processing and use, resulting in changes in molecular structure, becoming brittle gradually, and the mechanical properties and aging resistance decreasing, and the service life shortening.

[0003] In recent years, with the continuous expansion of the application fields of high-density polyethylene, the market demand for high-performance high-density polyethylene has been increasing day by day. However, the imported high-density polyethylene additives are expensive, which restricts their popularization and application. Therefore, the development of efficient high-density polyethylene composite additives to improve the aging resistance, mechanical properties, processing properties, etc. of high-density polyethylene has attracted more and more attention.

[0004] Currently, high-density polyethylene composite additives mainly include antioxidants, ultraviolet stabilizers, stabilizers, lubricants, plasticizers, antistatic agents, etc. These additives improve the aging resistance, mechanical properties and processing properties of high-density polyethylene through different action mechanisms. However, there may be problems such as poor synergistic effect and poor dispersibility among these additives, resulting in unstable quality and deteriorated performance of high-density polyethylene materials.

[0005] The patent application document with publication number CN115286839A discloses a special polyethylene composite additive with high ultraviolet resistance, and its components contain antioxidants, low-density polyethylene and nanoparticles. Among them, the nanoparticles are prepared by ball-milling and mixing zinc oxide, titanium dioxide and silicon dioxide in a certain molar ratio. During preparation, under a nitrogen atmosphere, the raw materials are mixed evenly and then added into a twin-screw extruder for melting, plasticizing, extruding and pelletizing. Prepared in this way, since the antioxidants and nanoparticles are in powder form, their dispersibility in low-density polyethylene is poor, which may affect the aging resistance of low-density polyethylene. Summary of the Invention

[0006] In order to improve the aging resistance of high-density polyethylene, this application provides a high-density polyethylene composite additive and a preparation method thereof.

[0007] A high-density polyethylene composite additive contains the following components in parts by weight: 50 - 80 parts of anti-aging agent, 1 - 5 parts of fluoropolymer, 1 - 10 parts of antistatic agent;

[0008] The preparation method of the anti-aging agent comprises the following steps:

[0009] S1: Dissolve urea in water, add formaldehyde, stir, adjust the pH to 8 - 9, react at 70 - 75 °C for 0.5 - 3 h, and cool to room temperature to obtain mixture A;

[0010] S2: Add tetrabutyl titanate, tetraethyl orthosilicate and ethanol to mixture A, stir for 1 - 3 h to obtain mixture B;

[0011] S3: Mix the antioxidant, emulsifier and water evenly at 35 - 50 °C, add mixture B, stir for 5 - 10 min, adjust the pH value to 3 - 5, react at 60 - 65 °C for 2 - 5 h, filter and dry to obtain the product.

[0012] In the above technical solution, the anti-aging agent is a microcapsule with an antioxidant as the core and a urea-formaldehyde resin doped with titanium dioxide and silicon dioxide nanoparticles as the wall. First, the antioxidant is encapsulated in the microcapsule. Firstly, it can protect the antioxidant from the influence of light, heat and oxygen during the processing and use of high-density polyethylene, thereby prolonging the service life of the antioxidant; secondly, it can achieve the slow release of the antioxidant, avoid premature consumption of the antioxidant, improve the utilization efficiency of the antioxidant, and endow high-density polyethylene with long-term antioxidant properties; finally, it can improve the dispersion performance of the antioxidant, enable the antioxidant to be evenly distributed in high-density polyethylene, and reduce the performance degradation caused by uneven dispersion.

[0013] Secondly, in the outdoor atmospheric environment, high-density polyethylene is easily irradiated by ultraviolet rays, which can trigger photo-oxidation reactions and cause the aging and degradation of high-density polyethylene. To reduce the aging and degradation of high-density polyethylene, an anti-ultraviolet agent that can absorb or scatter ultraviolet rays to achieve a shielding effect is introduced into the microcapsule. Titanium dioxide nanoparticles have good absorption, reflection and scattering abilities for ultraviolet rays. When irradiated by ultraviolet rays, during the transition of electrons from the valence band to the conduction band in nano-titanium dioxide, it causes the absorption of ultraviolet rays. Due to the small particle size and large quantity of nano-titanium dioxide, its absorption ability for ultraviolet rays is strong, and it can also block ultraviolet rays by reflection and scattering. In addition, nano-silicon dioxide has a large specific surface area and high activity, and can also effectively shield ultraviolet rays; moreover, nano-silicon dioxide also has anti-adhesion properties, which can reduce the adhesion between high-density polyethylene molecules, reduce the tendency of adhesion, and improve the processing fluidity of high-density polyethylene. In summary, introducing nano-silicon dioxide and nano-titanium dioxide into the microcapsule can not only enhance the stability of the microcapsule, improve the strength and toughness of high-density polyethylene, but also improve the anti-aging performance and processing performance of high-density polyethylene.

[0014] Thirdly, urea-formaldehyde resin is made into microcapsules and added to high-density polyethylene, which can improve its dispersibility in high-density polyethylene, make it evenly distributed in high-density polyethylene, and reduce performance differences caused by uneven distribution; moreover, urea-formaldehyde resin embeds antioxidants inside it, so that nano-titanium dioxide and nano-silicon dioxide are doped in its molecules, which can reduce the mutual influence between antioxidants and nano-titanium dioxide and nano-silicon dioxide, and improve their synergistic effect; in addition, urea-formaldehyde resin contains more hydrogen bonds. When affected by light, heat, and oxygen, the high-density polyethylene molecular chain breaks, which can be repaired to a certain extent by rebuilding the hydrogen bonds in the urea-formaldehyde resin, thereby improving the aging resistance of high-density polyethylene, reducing the degradation rate, and extending its service life.

[0015] Preferably, the fluoropolymer is one or more of fluoropolymer FX5922, fluoropolymer FX5917 and fluoropolymer FX9613.

[0016] In the above-mentioned technical solution, fluoropolymer is a linear alkane polymer in which some or all of the hydrogen atoms in its molecular structure are replaced by fluorine. As a result, fluoropolymer has a low surface energy. During the processing of high-density polyethylene (HDPE), it can effectively reduce friction between the melt and the mold, thereby reducing shear stress and suppressing the occurrence of melt fracture. Furthermore, due to the flexibility and low viscosity of the fluoropolymer molecular chain, fluoropolymer can act as a plasticizer, improving the fluidity of the HDPE during processing, thereby helping the HDPE melt to be evenly distributed in the mold and reducing surface roughening.

[0017] Preferably, the antistatic agent is bis(β-hydroxyethyl)coconut amine.

[0018] Preferably, in step S1, the mass ratio of urea to formaldehyde is 1:(1.5-3).

[0019] Preferably, the mass ratio of urea, tetrabutyl titanate, and tetraethyl orthosilicate is 1:(0.2-0.5):(0.1-0.3).

[0020] Preferably, in step S3, the antioxidant consists of a phenolic antioxidant and a phosphite antioxidant, and the mass ratio of the phenolic antioxidant to the phosphite antioxidant is 1:(0.1-0.5).

[0021] With the above technical solution, firstly, the phenolic hydroxyl groups in the phenolic antioxidant have high activity and can quickly combine with free radicals to prevent the occurrence of oxidative degradation reactions. Moreover, they have good thermal stability and compatibility, and can continuously play an antioxidant role during the processing and use of high-density polyethylene. Secondly, the phosphite antioxidant can decompose the hydroperoxides generated during the processing of high-density polyethylene, prevent them from further decomposing to generate free radicals, and thus inhibit the breakage of polymer chains. Taking the phenolic antioxidant as the main component and the phosphite antioxidant as the auxiliary component can synergistically improve the aging resistance of high-density polyethylene.

[0022] Preferably, the phenolic antioxidant is one or more of antioxidant 1010, antioxidant 264, and antioxidant 1076; the phosphite antioxidant is one or more of antioxidant DSTP, antioxidant 242, and antioxidant 168.

[0023] Preferably, in step S2, the emulsifier is one or more of sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, and sodium hexadecyl sulfate.

[0024] Preferably, the mass ratio of urea to the antioxidant is 1:(2.2 - 4.8).

[0025] A preparation method of a high-density polyethylene composite additive includes the following steps:

[0026] Mix the raw material components of the high-density polyethylene composite additive evenly and carry out extrusion granulation to obtain the composite additive.

[0027] In the above technical solution, after mixing the raw materials of the high-density polyethylene composite additive evenly and carrying out extrusion granulation to make composite additive particles, and then adding them to high-density polyethylene, the dispersibility of the composite additive in high-density polyethylene can be improved, and the agglomeration phenomenon caused by uneven mixing during the separate addition of each additive can be reduced. Therefore, the quality uniformity and stability of high-density polyethylene can be improved; moreover, adding the composite additive in the form of particles reduces the mixing difficulty of adding each powder additive or liquid additive and improves production efficiency.

[0028] The above technical solution of this application has at least the following beneficial effects:

[0029] 1. Embedding the antioxidant in the microcapsules in this application can not only protect the antioxidant, extend its service life, but also achieve the slow release of the antioxidant, enabling high-density polyethylene to have long-term antioxidant performance; in addition, it can also improve the dispersibility of the antioxidant and reduce the agglomeration phenomenon.

[0030] 2. During the preparation of the microcapsules in this application, the urea-formaldehyde resin doped with nano-titanium dioxide and nano-silica is used as the capsule wall, which can not only enhance the stability of the microcapsules, but also exert the synergistic effect of nano-titanium dioxide and nano-silica, improving the anti-aging performance, processing performance, etc. of high-density polyethylene. In addition, it also has a certain self-healing effect, further enhancing the anti-aging performance of high-density polyethylene.

[0031] 3. In this application, the high-density polyethylene composite additives are made into particles, which can improve the dispersibility of the composite additives in high-density polyethylene, reduce the mixing difficulty between each additive and high-density polyethylene, and thus improve the production efficiency. Brief Description of the Drawings

[0032] Figure 1 is the tensile strength retention rate of the high-density polyethylene specimen after the aging test. Detailed Description of the Embodiments

[0033] The following further elaborates on this application in conjunction with embodiments.

[0034] Unless otherwise specified, the raw materials in the embodiments and comparative examples of this application are all commercially available.

[0035] Embodiments

[0036] Example 1

[0037] The high-density polyethylene composite additives in this example contain the following components in parts by weight: 50 parts of anti-aging agent, 1 part of fluoropolymer, and 10 parts of antistatic agent;

[0038] The preparation method of the anti-aging agent in this example includes the following steps:

[0039] S1: Weigh 10 g of urea, dissolve it in 100 mL of deionized water, add 50 g of formaldehyde solution with a mass fraction of 30%, use a magnetic stirrer, adjust the rotation speed to 400 r / min, adjust the pH to 8, react at 70 °C for 3 h, and cool to room temperature to obtain the mixed solution A;

[0040] S2: Slowly add 2 g of tetrabutyl titanate, 1 g of tetraethyl orthosilicate, and 20 mL of ethanol to the mixed solution A, adjust the stirring speed to 150 r / min, and continue stirring for 1 h to obtain the mixed solution B;

[0041] S3: Weigh 1 g of antioxidant 1010, 1 g of antioxidant 264, 0.2 g of antioxidant DSTP, 0.5 g of sodium dodecylbenzenesulfonate, and 50 g of deionized water, mix them evenly at 40 °C, add the mixed solution B, stir for 5 min, adjust the pH value to 3 with dilute hydrochloric acid, react at 60 °C for 5 h, and perform filtration and drying after the reaction is completed;

[0042] The preparation method of the high-density polyethylene composite additive in this embodiment includes the following steps:

[0043] Weigh 500 g of anti-aging agent, 10 g of fluoropolymer FX5922 and 100 g of bis(β-hydroxyethyl)cocoamine. At room temperature, stir and mix at a stirring speed of 150 r / min for 5 min, and then put the mixture into an extrusion granulator for granulation. That's it.

[0044] Example 2

[0045] The high-density polyethylene composite additive in this embodiment contains the following components in parts by weight: 80 parts of anti-aging agent, 5 parts of fluoropolymer, and 1 part of antistatic agent;

[0046] The preparation method of the anti-aging agent in this embodiment includes the following steps:

[0047] S1: Weigh 10 g of urea, dissolve it in 100 mL of deionized water, add 100 g of formaldehyde solution with a mass fraction of 30%, use a magnetic stirrer, adjust the rotation speed to 400 r / min, adjust the pH to 9, react at 75 °C for 0.5 h, and cool to room temperature to obtain the mixed solution A;

[0048] S2: Slowly add 2 g of tetrabutyl titanate, 1 g of tetraethyl orthosilicate and 20 mL of ethanol to the mixed solution A, adjust the stirring speed to 150 r / min, and continue stirring for 3 h to obtain the mixed solution B;

[0049] S3: Weigh 1 g of antioxidant 1076, 1 g of antioxidant 264, 0.1 g of antioxidant DSTP, 0.1 g of antioxidant 168, 0.5 g of sodium dodecyl sulfate and 50 g of deionized water, mix evenly at 40 °C, add the mixed solution B, stir for 10 min, adjust the pH value to 5 with dilute hydrochloric acid, react at 65 °C for 2 h, and perform filtration and drying after the reaction is completed. That's it.

[0050] The preparation method of the high-density polyethylene composite additive in this embodiment includes the following steps:

[0051] Weigh 800 g of anti-aging agent, 50 g of fluoropolymer FX5917 and 10 g of bis(β-hydroxyethyl)cocoamine. At room temperature, stir and mix at a stirring speed of 150 r / min for 5 min, and then put the mixture into an extrusion granulator for granulation. That's it.

[0052] Example 3

[0053] The high-density polyethylene composite additive in this embodiment contains the following components in parts by weight: 65 parts of anti-aging agent, 3 parts of fluoropolymer, and 5 parts of antistatic agent;

[0054] The preparation method of the anti-aging agent in this embodiment includes the following steps:

[0055] S1: Weigh 10 g of urea, dissolve it in 100 mL of deionized water, add 80 g of formaldehyde solution with a mass fraction of 30%, use a magnetic stirrer, adjust the rotation speed to 400 r / min, adjust the pH to 9, react at 75 °C for 0.5 h, cool to room temperature to obtain the mixed solution A;

[0056] S2: Slowly add 2 g of tetrabutyl titanate, 1 g of tetraethyl orthosilicate and 20 mL of ethanol to the mixed solution A, adjust the stirring speed to 150 r / min, and continue stirring for 2 h to obtain the mixed solution B;

[0057] S3: Weigh 1 g of antioxidant 1076, 1 g of antioxidant 1010, 0.1 g of antioxidant 242, 0.1 g of antioxidant 168, 0.5 g of sodium hexadecyl sulfate and 50 g of deionized water, mix evenly at 40 °C, add the mixed solution B, stir for 10 min, adjust the pH value to 4 with dilute hydrochloric acid, react at 65 °C for 2 h, and perform filtration and drying after the reaction is completed;

[0058] The preparation method of the high-density polyethylene composite additive in this example includes the following steps:

[0059] Weigh 650 g of anti-aging agent, 10 g of fluoropolymer FX5917, 20 g of fluoropolymer FX9613 and 50 g of bis(β-hydroxyethyl)cocoamine, stir and mix at a stirring speed of 150 r / min at room temperature for 5 min, and then put the mixed material into an extrusion granulator for granulation;

[0060] Example 4

[0061] The weight fraction components of the high-density polyethylene composite additive in this example are the same as those in Example 3;

[0062] The difference in the preparation method of the anti-aging agent in this example from that in Example 3 lies in:

[0063] S2: Slowly add 5 g of tetrabutyl titanate, 3 g of tetraethyl orthosilicate and 20 mL of ethanol to the mixed solution A, adjust the stirring speed to 150 r / min, and continue stirring for 2 h to obtain the mixed solution B;

[0064] The remaining steps are the same as those in Example 3;

[0065] The preparation method of the high-density polyethylene composite additive in this example is the same as that in Example 3.

[0066] Example 5

[0067] The weight fraction components of the high-density polyethylene composite additive in this example are the same as those in Example 4;

[0068] The difference in the preparation method of the anti-aging agent in this example from that in Example 4 lies in:

[0069] S3: Weigh 2 g of antioxidant 1076, 1.2 g of antioxidant 1010, 0.8 g of antioxidant 242, 0.8 g of antioxidant 168, 0.5 g of sodium lauryl sulfate, and 50 g of deionized water. Mix them evenly at 40 °C, add mixture B, stir for 10 min, adjust the pH value to 4 with dilute hydrochloric acid, react at 65 °C for 2 h, and then filter and dry after the reaction to obtain:

[0070] The remaining steps are the same as those in Example 4;

[0071] The preparation method of the high-density polyethylene composite additive in this example is the same as that in Example 4.

[0072] Example 6

[0073] The weight fraction components of the high-density polyethylene composite additive in this example are the same as those in Example 4;

[0074] The difference in the preparation method of the anti-aging agent in this example from that in Example 4 lies in:

[0075] S3: Weigh 2 g of antioxidant 1076, 1 g of antioxidant 1010, 0.5 g of antioxidant 242, 0.4 g of antioxidant 168, 0.5 g of sodium lauryl sulfate, and 50 g of deionized water. Mix them evenly at 40 °C, add mixture B, stir for 10 min, adjust the pH value to 4 with dilute hydrochloric acid, react at 65 °C for 2 h, and then filter and dry after the reaction to obtain:

[0076] The remaining steps are the same as those in Example 4;

[0077] The preparation method of the high-density polyethylene composite additive in this example is the same as that in Example 4.

[0078] Comparative Example

[0079] Comparative Example 1

[0080] The high-density polyethylene composite additive in this comparative example contains the following components in weight fractions: 45 parts of urea-formaldehyde resin, 1 part of nano-titanium dioxide, 0.5 part of nano-silica, 1.5 parts of antioxidant 1010, 1.5 parts of antioxidant 264, 0.5 part of antioxidant DSTP, 1 part of fluoropolymer FX5922, and 10 parts of bis(β-hydroxyethyl)cocoamine;

[0081] The preparation method of the high-density polyethylene composite additive in this comparative example includes the following steps:

[0082] Weigh 450 g of urea-formaldehyde resin, 10 g of nano-titanium dioxide, 5 g of nano-silica, 15 g of antioxidant, 15 g of antioxidant 264, 5 g of antioxidant DSTP, 10 g of fluoropolymer FX5922 and 100 g of bis(β-hydroxyethyl)cocoamine. At room temperature, stir and mix them at a stirring speed of 150 r / min for 5 min, and then put the mixture into an extrusion granulator for granulation. That's it.

[0083] Performance detection test

[0084] Aging resistance performance detection

[0085] 1. Specimen preparation: Mix 100 g of the high-density polyethylene composite additive and 1 kg of high-density polyethylene of Examples 1-6 and Comparative Example 1 evenly under a nitrogen atmosphere, add them to a twin-screw extruder for melting, plasticizing and extruding. The melting temperature is 180 °C, the screw speed is 50 r / min, and specimens of 100 mm×100 mm×0.1 mm are made for aging resistance performance testing. At the same time, pure high-density polyethylene, that is, high-density polyethylene without adding the composite additive, is used as a blank experiment.

[0086] 2. Steps of the photoaging experiment: Use a spherical mercury xenon lamp with an ultraviolet radiation wavelength less than 365 nm to irradiate the above specimens for 15 days respectively, and then conduct a tensile property test. The tensile rate is 50 mm / min, and the results of the tensile strength retention rate are as Figure 1 shown;

[0087] 3. Steps of the thermal aging experiment: Place the above specimens in the same forced-air drying oven, age them at 120 °C for 30 days, and then conduct a tensile property test. The tensile rate is 50 mm / min, and the results of the tensile strength retention rate are as Figure 1 shown.

[0088] Result analysis

[0089] From Figure 1 it can be seen that compared with the blank experiment, the tensile strength retention rates of the high-density polyethylene specimens of the comparative examples and the examples are relatively high, indicating better aging resistance performance.

[0090] From Figure 1From the data of Comparative Example 1 and Examples 1-3, it can be seen that the high-density polyethylene composite additives obtained by the preparation methods of Examples 1-3 can better improve the anti-aging performance of high-density polyethylene. And with the increase of the addition amount of the anti-aging agent, the anti-aging performance first increases and then basically remains unchanged. This may be because the encapsulation effect of the microcapsules on the antioxidant is more conducive to improving the dispersibility and stability of the antioxidant, thereby improving its long-term utilization rate. Moreover, after the urea-formaldehyde resin is hybridized with nano-titanium dioxide and nano-silica, it is more conducive to improving the dispersibility and stability of nano-titanium dioxide and nano-silica, and thus more conducive to improving their ultraviolet shielding performance. In addition, the formation of microcapsules is also beneficial to improving the tensile properties of high-density polyethylene.

[0091] From Figure 1 From the data of Examples 3-6, it can be seen that with the increase of the contents of nano-titanium dioxide and nano-silica in the anti-aging agent, the anti-aging performance of high-density polyethylene is improved. Moreover, the combined use of phenolic antioxidants and phosphite antioxidants in the antioxidant is also more conducive to improving the anti-aging performance of high-density polyethylene.

[0092] This specific embodiment is only an interpretation of the present application, and it is not a limitation of the present application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A high-density polyethylene composite additive, characterized in that, Comprising the following components in parts by weight: 50 - 80 parts of an anti-aging agent, 1 - 5 parts of a fluoropolymer, and 1 - 10 parts of an antistatic agent; The preparation method of the anti-aging agent comprises the following steps: S1: Dissolve urea in water, add formaldehyde, stir, adjust the pH to 8 - 9, react at 70 - 75 °C for 0.5 - 3 h, and cool to room temperature to obtain a mixed solution A; S2: Add tetrabutyl titanate, tetraethyl orthosilicate, and ethanol to the mixed solution A, stir for 1 - 3 h to obtain a mixed solution B; S3: Mix an antioxidant, an emulsifier, and water evenly at 35 - 50 °C, add the mixed solution B, stir for 5 - 10 min, adjust the pH value to 3 - 5, react at 60 - 65 °C for 2 - 5 h, filter and dry to obtain the product; In step S1, the mass ratio of urea to formaldehyde is 1:(1.5 - 3); The mass ratio of urea, tetrabutyl titanate, and tetraethyl orthosilicate is 1:(0.2 - 0.5):(0.1 - 0.3); The mass ratio of urea to the antioxidant is 1:(2.2 - 4.8); In step S3, the antioxidant consists of a phenolic antioxidant and a phosphite antioxidant, and the mass ratio of the phenolic antioxidant to the phosphite antioxidant is 1:(0.1 - 0.5).

2. The high-density polyethylene composite additive according to claim 1, wherein The fluoropolymer is one or more of fluoropolymer FX5922, fluoropolymer FX5917, and fluoropolymer FX9613.

3. The high-density polyethylene composite auxiliary agent according to claim 1, characterized in that, The antistatic agent is bis(β-hydroxyethyl)cocoamine.

4. The high-density polyethylene composite auxiliary agent according to claim 1, wherein, The phenolic antioxidant is one or more of antioxidant 1010, antioxidant 264, and antioxidant 1076; the phosphite antioxidant is one or more of antioxidant DSTP, antioxidant 242, and antioxidant 168.

5. The high-density polyethylene composite auxiliary agent according to claim 1, wherein In step S2, the emulsifier is one or more of sodium dodecylbenzenesulfonate, sodium dodecyl sulfate, and sodium hexadecyl sulfate.

6. A preparation method of the high-density polyethylene composite auxiliary agent according to claim 1, characterized in that, Comprising the following steps: Mix the raw materials of each component of the high-density polyethylene composite additive evenly, and carry out extrusion granulation to obtain the product.

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