Flame-retardant antistatic HDPE (high-density polyethylene) master batch as well as preparation method and application thereof

Abstract

The invention discloses a flame-retardant antistatic HDPE (high-density polyethylene) master batch as well as a preparation method and application thereof. The master batch comprises 100 parts of HDPE, 15-30 parts of a monomer mixture, 10-40 parts of filler, 0.1-5 parts of an antistatic agent and 1-10 parts of a flame retardant, the HDPE is subjected to plasma treatment; the monomer mixture is subjected to irradiation treatment and is formed by mixing at least two of methacrylic acid, acrylic acid, acrylamide, 2-vinylpyridine and vinyl-3-ethyl hydrogen silane; the antistatic agent is a compound antistatic agent; and the flame retardant is a compound flame retardant. The preparation method comprises the following steps: S1, plasma treatment of HDPE; s2, carrying out irradiation treatment on the monomer mixture; s3, carrying out reaction on HDPE and the monomer mixture to obtain a high polymer; s4, grinding the filler; and S5, extruding and granulating the high polymer, the filler, the antistatic agent and the flame retardant to obtain the flame-retardant antistatic HDPE master batch. According to the application, the HDPE master batch and polyethylene are mixed to prepare the flame-retardant antistatic composite material.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a flame-retardant and antistatic HDPE masterbatch and a preparation method and application thereof. Background Art

[0002] Polyethylene (PE) is the leading thermoplastic. Its lightweight, non-toxic, and excellent chemical resistance make it widely used in industries such as electrical appliances, chemicals, food, and machinery. High-density polyethylene (HDPE), a polymer formed from the polymerization of ethylene monomers, exhibits excellent mechanical properties, chemical stability, and processing capabilities. Its dense molecular chain structure and high crystallinity contribute to its high density and hardness, making it widely used in packaging, pipes, wire and cable, and other fields. However, due to its dense molecular chain structure and high crystallinity, HDPE is prone to generating static electricity during friction. When this static charge accumulates to a certain level, it can cause a violent discharge and spark. Furthermore, HDPE has a low oxygen index, making it a flammable material. Sparks can easily cause the material to combust. In some flammable and explosive chemical environments, sparks can even cause explosions, posing a significant risk. Therefore, antistatic modification of HDPE is essential to eliminate the hazards of static electricity.

[0003] At present, there are two main methods for antistatic modification of high-density polyethylene (HDPE): (1) One method is to treat the surface of HDPE products by electroplating, coating, pasting, etc. to form a conductive layer on the surface of the products, but this method has the problems of high cost, high pollution and difficulty in processing products with complex shapes; (2) Another method is to add antistatic agents or conductive fillers (such as conductive carbon black, graphite, metal powder, etc.) to HDPE to improve the antistatic property or conductivity of HDPE, but the addition of antistatic agents will promote the combustion of high-density polyethylene, resulting in reduced flame retardancy, and the addition of fillers (such as carbon black fillers) will make the material turn black. For products with color requirements, after adding carbon black fillers, products of other colors cannot be prepared. If metal fillers are added, the price is high, it is easy to oxidize and will severely crack, resulting in poor mechanical properties of the product.

[0004] At the same time, there is a certain antagonistic effect between the modification of flame retardancy and antistatic properties. If modified together, it will affect the physical properties of the material, making it difficult to achieve both simultaneously. Therefore, it is necessary to comprehensively consider the antistatic modification method based on the above shortcomings, and at the same time, it is necessary to achieve a balance between flame retardancy and antistatic properties during the modification. Summary of the Invention

[0005] The purpose of the present invention is to address the problems existing in the existing HDPE antistatic modification methods and to propose a flame retardant antistatic HDPE masterbatch to solve the above problems.

[0006] To achieve the above object, the present invention is achieved through the following technical solutions:

[0007] The present invention provides a flame retardant and antistatic HDPE masterbatch, which comprises the following components in parts by weight: 100.0 parts of HDPE, 15.0-30.0 parts of a monomer mixture, 10.0-40.0 parts of a filler, 0.1-5.0 parts of an antistatic agent, and 1.0-10.0 parts of a flame retardant;

[0008] The HDPE is HDPE surface-treated by plasma technology; the monomer mixture is irradiated and is a mixture of at least two of methacrylic acid, acrylic acid, acrylamide, 2-vinylpyridine, and vinyl-3-ethylhydrogen silane; the antistatic agent is a compound antistatic agent; and the flame retardant is a compound flame retardant.

[0009] Furthermore, a flame retardant and antistatic HDPE masterbatch comprises the following components in parts by weight: 100.0 parts of HDPE, 20.0-25.0 parts of a monomer mixture, 20.0-30.0 parts of a filler, 1.5-3.0 parts of an antistatic agent, and 3.0-7.0 parts of a flame retardant.

[0010] Furthermore, a flame-retardant and antistatic HDPE masterbatch: the filler is selected from at least two of metal oxides, metal hydroxides, carboxylates, silicates, aluminosilicates, organometallic compounds, halides, glass fibers, carbon fibers, metal-coated glass beads, metal oxide powders, metal fibers, antimony-coated tin oxide, antimony- and tin oxide-coated titanium dioxide, silver-coated glass fibers, silver-coated glass foil, copper-coated graphite fibers, stainless steel fibers, nickel fibers, nickel-coated carbon fibers, aluminum fibers, silver-, aluminum-, or copper-coated ceramic microbeads, copper-, stainless steel-, or aluminum-coated mica, zinc-tin alloys, zinc-aluminum alloys, and aluminum foil. The fillers can be mixed in any proportion.

[0011] Furthermore, a flame-retardant antistatic HDPE masterbatch is provided: the antistatic agent is a compound of at least two of the following: polyetheresteramide, polyetherimide, quaternary ammonium salt-containing acrylic ester copolymer, monoglycolic acid glyceride, quaternary ammonium salt-containing maleimide copolymer, sodium polystyrene sulfonate, quaternary aminocarboxylic acid inner salt copolymer, polyethylene oxide-methyl methacrylate copolymer, dodecyldimethyl quaternary ethyl inner salt, and chloropropanol. The compounding ratios may be arbitrary.

[0012] Furthermore, a flame-retardant and antistatic HDPE masterbatch: the flame retardant is compounded by at least two of antimony trioxide, magnesium hydroxide, aluminum hydroxide, and silicon-based flame retardants, and can be compounded in any proportion.

[0013] The present invention also provides a method for preparing a flame retardant and antistatic HDPE masterbatch, which comprises the following steps:

[0014] S1, plasma treatment of the HDPE, standby;

[0015] S2, irradiating the monomer mixture for standby use;

[0016] S3, reacting the plasma-treated HDPE and the irradiated monomer mixture, filtering, washing, and drying after the reaction to obtain a polymer;

[0017] S4, grinding the filler for standby use;

[0018] S5. The polymer, filler, antistatic agent and flame retardant are mixed evenly and then added into a twin-screw extruder for melt extrusion and granulation to obtain flame-retardant and antistatic HDPE masterbatch.

[0019] Furthermore, a method for preparing a flame-retardant and antistatic HDPE masterbatch is provided: in step S1, the plasma treatment time is 5.0 to 10.0 minutes; in step S2, the monomer mixture is subjected to a gamma-ray irradiation treatment for 5.0 to 10.0 minutes.

[0020] Furthermore, a method for preparing a flame-retardant and antistatic HDPE masterbatch is provided: Step S3, placing the plasma-treated HDPE and the irradiated monomer mixture in a reactor under air conditions at 45-60° C. for 15.0-20.0 min, filtering, washing, and drying after the reaction to obtain a polymer.

[0021] Furthermore, a method for preparing a flame retardant and antistatic HDPE masterbatch: in step S5, the temperatures of each zone of the twin-screw extruder are 150°C, 155°C, 160°C, 160°C, 160°C, 165°C, 165°C, 170°C, and 170°C, and the head temperature is 170°C.

[0022] The present invention also provides a use of a flame retardant and antistatic HDPE masterbatch. The flame retardant and antistatic HDPE masterbatch is dried and mixed with polyethylene, and then injection molded by an injection molding machine to obtain a flame retardant and antistatic composite material, wherein the polyethylene accounts for 50.0 to 70.0 wt%.

[0023] Specifically, the drying temperature of the flame retardant and antistatic HDPE masterbatch is 90-110°C, and the temperature of the injection molding machine is 190-220°C.

[0024] Beneficial effects of the present invention:

[0025] The flame-retardant and antistatic HDPE masterbatch of the present invention is prepared by surface treating HDPE with plasma technology to introduce polar groups such as hydroxyl groups, which can effectively destroy the stable structure of its surface. The monomer mixture is then irradiated with gamma rays, which not only enhances the grafting rate of the two but also reduces the ability of the polymer to accumulate static charge, thereby obtaining good antistatic properties.

[0026] At the same time, the compound antistatic agent of the present invention uses a zwitterionic antistatic agent, which can be used in combination with anionic or cationic antistatic agents. Both of them have strong adhesion to polymers, and thus can exert excellent antistatic properties; the compound flame retardant of the present invention can effectively reduce the antagonistic effect with the antistatic agent, thereby greatly improving the joint performance of the two properties and achieving a balance between the flame retardant and antistatic properties. DETAILED DESCRIPTION

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment 1 provides a flame retardant and antistatic HDPE masterbatch, which comprises the following components in parts by weight: 100.0 parts of HDPE, 23.0 parts of a monomer mixture, 25.0 parts of a filler, 2.5 parts of an antistatic agent, and 5.0 parts of a flame retardant;

[0030] Wherein, the HDPE is HDPE surface-treated by plasma technology;

[0031] The monomer mixture is irradiated with gamma rays, and the monomer mixture is prepared by mixing methacrylic acid and acrylic acid in a weight ratio of 1:1;

[0032] The filler is made of glass fiber and glass fiber coated with antimony and tin oxide titanium dioxide silver in a weight ratio of 1:1;

[0033] The antistatic agent is a compound antistatic agent, which is compounded by polyether ester amide and quaternary ammonium salt-containing acrylic acid ester copolymer in a weight ratio of 1:1. The preferred quaternary ammonium salt-containing acrylic acid ester copolymer has significant electrostatic regulation performance. Its core function is to reduce the surface charge of the polymer through the quaternary ammonium salt group, thereby solving problems such as electrostatic adsorption and pollution.

[0034] The flame retardant is a compound flame retardant, which is compounded by antimony trioxide and magnesium hydroxide in a weight ratio of 1:1.

[0035] Preparation: The method for preparing the flame-retardant and antistatic HDPE masterbatch in Example 1 comprises the following specific steps:

[0036] S1. Weigh 100.0 parts by weight of high-density polyethylene (HDPE) and perform plasma surface treatment on it for 8.0 min using plasma surface treatment technology, and set aside;

[0037] S2. Weigh 23.0 parts of the monomer mixture by weight and irradiate it with gamma rays for 8.0 minutes, and set aside;

[0038] S3, placing the plasma-treated HDPE and the monomer mixture treated with gamma rays in a reactor under air at 50° C. for 15.0 min, filtering, washing, and drying after the reaction to obtain a polymer;

[0039] S4. Weigh 25.0 parts of filler by weight and grind it for later use;

[0040] S5. The above-mentioned polymer, filler, compound antistatic agent and compound flame retardant are mixed evenly and then added into a twin-screw extruder for melt extrusion and granulation to obtain flame-retardant antistatic HDPE masterbatch; wherein, the temperatures of each zone of the twin-screw extruder are 150°C, 155°C, 160°C, 160°C, 160°C, 165°C, 165°C, 170°C, and 170°C, respectively, and the head temperature is 170°C.

[0041] Example 2

[0042] This embodiment 2 provides a flame retardant and antistatic HDPE masterbatch, which comprises the following components in parts by weight: 100.0 parts of HDPE, 15.0 parts of a monomer mixture, 10.0 parts of a filler, 0.2 parts of an antistatic agent, and 1.5 parts of a flame retardant;

[0043] Wherein, the HDPE is HDPE surface-treated by plasma technology;

[0044] The monomer mixture is irradiated with gamma rays, and the monomer mixture is prepared by mixing methacrylic acid and acrylamide in a weight ratio of 1:1;

[0045] The filler is made of a mixture of aluminosilicate and silver-coated glass foil in a weight ratio of 1:1;

[0046] The antistatic agent is a compound antistatic agent, which is compounded by polyether ester amide and polyether imide in a weight ratio of 1:1;

[0047] The flame retardant is a compound flame retardant, which is compounded by antimony trioxide and aluminum hydroxide in a weight ratio of 1:1.

[0048] Example 3

[0049] This embodiment 3 provides a flame retardant and antistatic HDPE masterbatch, which comprises the following components in parts by weight: 100.0 parts of HDPE, 29.0 parts of a monomer mixture, 39.0 parts of a filler, 4.7 parts of an antistatic agent, and 9.8 parts of a flame retardant;

[0050] Wherein, the HDPE is HDPE surface-treated by plasma technology;

[0051] The monomer mixture is irradiated with gamma rays, and the monomer mixture is prepared by mixing methacrylic acid and 2-vinylpyridine in a weight ratio of 1:1;

[0052] The filler is made of antimony-plated tin oxide and copper-coated ceramic microbeads mixed in a weight ratio of 1:1;

[0053] The antistatic agent is a compound antistatic agent, which is compounded by monoglycoside glyceride and maleimide copolymer containing quaternary ammonium salt group in a weight ratio of 1:1;

[0054] The flame retardant is a compound flame retardant, which is compounded by antimony trioxide and silicon-based flame retardant in a weight ratio of 1:1.

[0055] Example 4

[0056] This embodiment 4 provides a flame retardant and antistatic HDPE masterbatch, which comprises the following components in parts by weight: 100.0 parts of HDPE, 20.0 parts of a monomer mixture, 20.0 parts of a filler, 1.5 parts of an antistatic agent, and 3.5 parts of a flame retardant;

[0057] Wherein, the HDPE is HDPE surface-treated by plasma technology;

[0058] The monomer mixture is irradiated with gamma rays and is prepared by mixing acrylic acid and vinyl-3-ethylhydrogen silane in a weight ratio of 1:1;

[0059] The filler is made of stainless steel fiber and aluminum-coated mica mixed in a weight ratio of 1:1;

[0060] The antistatic agent is a compound antistatic agent, which is prepared by compounding sodium polystyrene sulfonate, quaternary ammonium carboxylic acid inner salt copolymer, and polyethylene oxide-methyl methacrylate copolymer in a weight ratio of 1:1:1.

[0061] The flame retardant is a compound flame retardant, which is compounded by magnesium hydroxide and aluminum hydroxide in a weight ratio of 1:1.

[0062] Example 5

[0063] This embodiment 5 provides a flame retardant and antistatic HDPE masterbatch, which comprises the following components in parts by weight: 100.0 parts of HDPE, 25.0 parts of a monomer mixture, 30.0 parts of a filler, 3.0 parts of an antistatic agent, and 6.8 parts of a flame retardant;

[0064] Wherein, the HDPE is HDPE surface-treated by plasma technology;

[0065] The monomer mixture is irradiated with gamma rays and is prepared by mixing methacrylic acid, acrylic acid, and acrylamide in a weight ratio of 1:1:1;

[0066] The filler is made of a mixture of metal oxide and zinc-tin alloy in a weight ratio of 1:1;

[0067] The antistatic agent is a compound antistatic agent, which is prepared by compounding polyetherimide, dodecyl dimethyl quaternary ethyl salt and chloropropanol in a weight ratio of 1:1:1;

[0068] The flame retardant is a compound flame retardant, which is compounded by magnesium hydroxide, aluminum hydroxide and silicon flame retardant in a weight ratio of 1:1:1.

[0069] Comparative Example 1

[0070] The difference between Comparative Example 1 and Example 1 is that the antistatic agent and flame retardant in Comparative Example 1 are different from those in Example 1. Specifically, Comparative Example 1 uses a single polyether ester amide as an antistatic agent and a single antimony trioxide as a flame retardant. The other conditions of Comparative Example 1 are the same as those of Example 1.

[0071] Comparative Example 2

[0072] The difference between Comparative Example 2 and Example 1 is that no monomer mixture is added in Comparative Example 2, and the other conditions of Comparative Example 2 are the same as those of Example 1.

[0073] Comparative Example 3

[0074] The difference between Comparative Example 3 and Example 1 is that the filler in Comparative Example 3 is different from that in Example 1. Specifically, a single glass fiber is used as the filler in Comparative Example 3. The other conditions of Comparative Example 3 are the same as those in Example 1.

[0075] Comparative Example 4

[0076] The difference between Comparative Example 4 and Example 1 is that in the process of preparing the flame-retardant and antistatic HDPE masterbatch in Comparative Example 4, the HDPE is not subjected to plasma treatment, and the other conditions of Comparative Example 4 are the same as those of Example 1.

[0077] Comparative Example 5

[0078] The difference between Comparative Example 5 and Example 1 is that in Comparative Example 5, the monomer mixture is not subjected to gamma-ray irradiation during the preparation of the flame-retardant and antistatic HDPE masterbatch. The other conditions of Comparative Example 5 are the same as those of Example 1.

[0079] Application: The flame retardant and antistatic HDPE masterbatches of Examples 1 to 5 and Comparative Examples 1 to 5 were dried at 100° C. for 24 hours and then mixed with polyethylene to form a mixed material (in which polyethylene accounted for 60.0 wt%), which was then injection molded by an injection molding machine (the injection molding machine temperature was 205° C.) to obtain a flame retardant and antistatic composite material.

[0080] Test: Flame-retardant and antistatic composite materials prepared by mixing the masterbatches of Examples 1 to 5 and Comparative Examples 1 to 5 with polyethylene were made into standard test specimens according to standard sizes, and their performance was then tested according to national standards.

[0081] (1) Tensile strength:

[0082] The test was carried out according to the standard GB / T 1040, with a tensile rate of 20 mm / min. The test results of Examples 1 to 5 and Comparative Examples 1 to 5 are shown in Table 1 below.

[0083] (2) Surface resistance:

[0084] The test was conducted in accordance with GB / T 1410-2006. Strips with a thickness of 2.0 mm were prepared for surface resistance testing. The ambient temperature during the test was 25±2°C and the humidity was 50±2% RH. The surface resistance values (Ω) of Examples 1 to 5 and Comparative Examples 1 to 5 were tested in Table 1 below (the lower the resistance value, the stronger the antistatic ability).

[0085] (3) Flame retardant performance test: According to UL94, the following fire resistance categories are obtained:

[0086] ①HB: The lowest flame retardant grade in the UL94 standard, requiring that the burning speed of samples with a thickness of 3 to 13 mm be less than 40 mm / min, and that the burning speed of samples with a thickness of less than 3 mm be less than 70 mm / min, or that the sample be extinguished before the 100 mm mark;

[0087] ②V-2: After two 10-second combustion tests on the sample, the flame goes out within 30 seconds and can ignite the cotton wool 30 cm below;

[0088] ③V-1: After two 10-second combustion tests on the sample, the flame goes out within 30 seconds and cannot ignite the cotton wool 30 cm below;

[0089] ④ V-0: After the sample is subjected to two 10-second combustion tests, the flame is extinguished within 10 seconds and no burning material falls; the flame retardant performance test results of Examples 1 to 5 and Comparative Examples 1 to 5 are shown in Table 1 below.

[0090] Table 1 shows the test results of tensile strength, surface resistance and flame retardant performance of the flame retardant and antistatic composite materials obtained in Examples 1 to 5 and Comparative Examples 1 to 5:

[0091] Tensile strength / MPa Surface resistance / Ω Flame retardant performance / UL94 Example 1 135.1 <![CDATA[2.1×10 6 ]]> V-0 Example 2 116.5 <![CDATA[7.8×10 6 ]]> V-0 Example 3 145.2 <![CDATA[1.3×10 6 ]]> V-0 Example 4 128.9 <![CDATA[3.7×10 6 ]]> V-0 Example 5 137.4 <![CDATA[6.4×10 6 ]]> V-0 Comparative Example 1 124.5 <![CDATA[4.2×10 11 ]]> HB Comparative Example 2 78.1 <![CDATA[8.9×10 10 ]]> V-2 Comparative Example 3 83.7 <![CDATA[8.4×10 9 ]]> V-1 Comparative Example 4 110.3 <![CDATA[6.2×10 9 ]]> V-1 Comparative Example 5 95.5 <![CDATA[5.1×10 10 ]]> V-1

[0092] Note: The lower the resistance value, the stronger the antistatic ability.

[0093] The above preferred embodiments of the present invention are only used to explain the present invention and are not used to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A flame retardant and antistatic HDPE masterbatch, characterized in that: The masterbatch comprises the following components in parts by weight: 100.0 parts of HDPE, 15.0-30.0 parts of monomer mixture, 10.0-40.0 parts of filler, 0.1-5.0 parts of antistatic agent and 1.0-10.0 parts of flame retardant; Wherein, the HDPE is HDPE surface-treated by plasma technology; The monomer mixture is irradiated and is a mixture of at least two of methacrylic acid, acrylic acid, acrylamide, 2-vinylpyridine, and vinyl-3-ethylhydrogen silane; the antistatic agent is a compound antistatic agent; and the flame retardant is a compound flame retardant.

2. The flame retardant and antistatic HDPE masterbatch according to claim 1, characterized in that: The masterbatch comprises the following components in parts by weight: 100.0 parts of HDPE, 20.0-25.0 parts of monomer mixture, 20.0-30.0 parts of filler, 1.5-3.0 parts of antistatic agent and 3.0-7.0 parts of flame retardant.

3. The flame retardant and antistatic HDPE masterbatch according to claim 1 or 2, characterized in that: The filler is selected from at least two of metal oxides, metal hydroxides, carboxylates, silicates, aluminosilicates, metal organic compounds, halides, glass fibers, carbon fibers, metal-coated glass beads, metal oxide powders, metal fibers, antimony-plated tin oxide, antimony- and tin oxide-plated titanium dioxide silver-coated glass fibers, silver-coated glass foil, copper-coated graphite fibers, stainless steel fibers, nickel fibers, nickel-coated carbon fibers, aluminum fibers, silver- or aluminum- or copper-coated ceramic microbeads, copper- or stainless steel- or aluminum-coated mica, zinc-tin alloys, zinc-aluminum alloys, and aluminum foil.

4. The flame retardant and antistatic HDPE masterbatch according to claim 1 or 2, characterized in that: The antistatic agent is prepared by compounding at least two of polyether ester amide, polyether imide, acrylate copolymer containing quaternary ammonium salt group, monoglycoside glyceride, maleimide copolymer containing quaternary ammonium salt group, sodium polystyrene sulfonate, quaternary aminocarboxylic acid inner salt copolymer, polyethylene oxide-methyl methacrylate copolymer, dodecyl dimethyl quaternary ethyl inner salt, and chloropropanol.

5. The flame retardant and antistatic HDPE masterbatch according to claim 1 or 2, characterized in that: The flame retardant is formed by compounding at least two of antimony trioxide, magnesium hydroxide, aluminum hydroxide and silicon-based flame retardant.

6. The method for preparing a flame retardant and antistatic HDPE masterbatch according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1, plasma treatment of the HDPE, standby; S2, irradiating the monomer mixture for standby use; S3, reacting the plasma-treated HDPE and the irradiated monomer mixture, filtering, washing, and drying after the reaction to obtain a polymer; S4, grinding the filler for standby use; S5. The polymer, filler, antistatic agent and flame retardant are mixed evenly and then added into a twin-screw extruder for melt extrusion and granulation to obtain flame-retardant and antistatic HDPE masterbatch.

7. The method for preparing a flame retardant and antistatic HDPE masterbatch according to claim 6, characterized in that: The plasma treatment time in step S1 is 5.0 to 10.0 minutes; and the monomer mixture is subjected to gamma ray irradiation treatment for 5.0 to 10.0 minutes in step S2.

8. The method for preparing a flame retardant and antistatic HDPE masterbatch according to claim 6, characterized in that: Step S3: placing the plasma-treated HDPE and the irradiated monomer mixture in a reactor under air conditions at 45-60° C. for 15.0-20.0 min, filtering, washing, and drying after the reaction to obtain a polymer.

9. The method for preparing a flame retardant and antistatic HDPE masterbatch according to claim 6, characterized in that: In step S5, the temperatures in each zone of the twin-screw extruder are 150°C, 155°C, 160°C, 160°C, 160°C, 165°C, 165°C, 170°C, and 170°C, and the head temperature is 170°C.

10. The use of a flame retardant and antistatic HDPE masterbatch according to any one of claims 1 to 5, characterized in that: The flame retardant and antistatic HDPE masterbatch is dried and mixed with polyethylene, and then injection molded by an injection molding machine to obtain a flame retardant and antistatic composite material.