Halogen-free flame-retardant polyethylene composite material, preparation method and application thereof

Abstract

The application discloses a halogen-free flame-retardant polyethylene composite material and a preparation method and application thereof. The halogen-free flame-retardant polyethylene composite material comprises the following components in parts by weight: 68-84 parts of polyethylene, 16-20 parts of a phosphorus-nitrogen flame retardant, 0.8-1.5 parts of a silicate, and 5-8 parts of ethylene-vinyl acetate copolymer; the melt flow rate of the ethylene-vinyl acetate copolymer is 10-40 g / 10 min under the condition of 190 DEG C and 2.16 kg; the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 22-28%; the silicate is selected from at least one of aluminum silicate, calcium silicate and sepiolite powder; and the D50 particle size of the silicate is 3-6 mu m. The halogen-free flame-retardant polyethylene composite material has excellent flame-retardant performance, bending resistance and good aging resistance.

Description

Technical Field

[0001] This invention belongs to the technical field of plastics, and more specifically, relates to a halogen-free flame-retardant polyethylene composite material, its preparation method, and its application. Background Technology

[0002] Interior decorations, such as most artificial grass, artificial flowers, and artificial leaves, are currently made of modified polyethylene. However, the existing modified polyethylene materials used in these decorations have insufficient flame retardant properties. Therefore, these artificial grass, artificial flowers, and artificial leaves are extremely easy to burn and will spread rapidly once a fire or open flame occurs.

[0003] In response, some countries or regions require that interior decorations made of such modified polyethylene materials must have flame-retardant properties. For example, EN 13823 is the core testing standard of the European Union for the fire resistance performance of building products. Its full name is "Fire testing of building materials – Excluding flooring exposed to the thermal shock of a single burning object". This standard assesses the combustion characteristics, smoke generation, and flame spread behavior of building materials by simulating real fire scenarios, and is an important technical support for the EU building product fire rating system (EN 13501-1). According to the EN 13823 standard, currently, EU interior decorations such as artificial grass and artificial flowers are required to meet at least Class B: FIGRA ≤ 120 W / s, THR600s ≤ 7.5 MJ / KG.

[0004] Currently, halogen-free intumescent flame-retardant systems are one of the development trends for flame-retardant polyethylene used in interior decoration. These systems primarily utilize phosphorus-based flame retardants and charring systems to form a carbon layer on the polyethylene matrix at high temperatures, thus blocking oxygen from contacting the matrix. Therefore, halogen-free intumescent flame-retardant systems have an inherent advantage in suppressing smoke. However, they also suffer from problems such as excessive smoke production due to excessive flame retardant addition, whitening after bending, or severe breakage, making it difficult to meet the low-smoke flame-retardant requirements for interior decorations. Furthermore, depending on the application scenario, interior decorations near windows, balconies, or subjected to long-term artificial light sources (such as spotlights) require superior aging resistance. Summary of the Invention

[0005] In view of the above-mentioned existing technical problems, the primary objective of this invention is to provide a halogen-free flame-retardant polyethylene composite material.

[0006] The second objective of this invention is to provide a method for preparing halogen-free flame-retardant polyethylene composite materials.

[0007] The third objective of this invention is to provide an interior simulation decoration product.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention claims protection for a halogen-free flame-retardant polyethylene composite material, which, by weight, comprises the following components: 68-84 parts of polyethylene, 16-20 parts of phosphorus-nitrogen flame retardant, 0.8-1.5 parts of silicate, and 5-8 parts of ethylene-vinyl acetate copolymer. The ethylene vinyl acetate copolymer has a melt flow rate of 10-40 g / 10 min at 190°C and 2.16 kg; the vinyl acetate content in the ethylene vinyl acetate copolymer is 22-28%. The silicate is selected from at least one of aluminum silicate, calcium silicate, and sepiolite powder; the D50 particle size of the silicate is 3-6 μm.

[0009] This invention employs a phosphorus-nitrogen halogen-free flame retardant, a specific type of silicate, and an ethylene vinyl acetate copolymer. The specific silicate exhibits superior free radical scavenging properties during combustion and can adhere to the char layer during char formation, increasing its thickness and better isolating combustion-supporting gases. The addition of the ethylene vinyl acetate copolymer enhances the viscoelasticity and continuity of the char layer, reducing cracks and pores, thus forming a denser, stronger, and more complete expanded char layer. The combination of the phosphorus-nitrogen halogen-free flame retardant, silicate, and ethylene vinyl acetate copolymer results in a denser char layer, significantly reducing the heat release of the polyethylene composition and simultaneously reducing the amount of flame retardant required.

[0010] Furthermore, this invention optimizes the flame retardant, flexural, and aging resistance properties of polyethylene composites by controlling the D50 particle size of silicates. When the D50 particle size of silicates is too large, it hinders the formation of a carbon layer in the flame retardant system, resulting in insufficient carbon layer density. Additionally, it impedes the dispersion of silicates and other substances in the system (such as ethylene vinyl acetate copolymer), easily leading to significant stress concentration at the bending point during bending, resulting in noticeable creases. Uneven dispersion of the ethylene vinyl acetate copolymer also affects the aging resistance of the polyethylene composite. When the D50 particle size of silicates is small, silicates are prone to agglomeration, forming stress concentration points in the system, reducing the flexural strength and flame retardant effect of the composite material.

[0011] Furthermore, the ethylene vinyl acetate copolymer also plays a dispersing role in the system, improving the compatibility of the phosphorus-nitrogen halogen-free flame retardant, silicate, and polyethylene matrix. When the melt flow rate of the ethylene vinyl acetate copolymer is low, it affects the uniform dispersion of the copolymer in the system, easily forming copolymer enrichment zones and flame retardant agglomeration, resulting in a decrease in flame retardant effect, flexural resistance, and aging resistance. When the melt flow rate of the ethylene vinyl acetate copolymer is high, its molecular weight is too low, resulting in low inherent strength and difficulty in improving flexural resistance. During combustion, low molecular weight ethylene vinyl acetate copolymers preferentially decompose, failing to form a stable polymer network. Furthermore, when the vinyl acetate content in the ethylene vinyl acetate copolymer is low, it cannot effectively improve flame retardancy, flexural resistance, and aging resistance. When the vinyl acetate content is high, the excess vinyl acetate will cause ester bond breakage and deep decomposition during combustion. On the one hand, the resulting carbon layer becomes loose, porous and weak, and cannot effectively protect the composite material. On the other hand, it will reduce the aging resistance. In addition, excess vinyl acetate will also cause the mechanical properties of the composite material to decline excessively and the bending resistance to be poor.

[0012] This invention combines phosphorus-nitrogen flame retardants, specific types of silicates, and ethylene vinyl acetate copolymers, and controls the D50 particle size of the silicates, the melt flow rate of the ethylene vinyl acetate copolymers, and the vinyl acetate content, so that the halogen-free flame-retardant polyethylene composite material has excellent flame retardant properties, bending resistance, and good aging resistance.

[0013] Specifically, the number of parts of polyethylene can be 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, etc., or any range formed by the above values, such as 69-83 parts, 75-80 parts, etc., and the present invention is not limited thereto. Specifically, the number of parts of phosphorus-nitrogen flame retardant can be 16.5, 17, 17.5, 18, 18.5, 19, 19.5, etc., or any range formed by the above values, and the present invention is not limited thereto. Specifically, the number of parts of silicate can be 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, etc., or any range formed by the above values, and the present invention is not limited thereto. Specifically, the number of parts of the ethylene vinyl acetate copolymer can be 5.2 parts, 5.5 parts, 5.8 parts, 6 parts, 6.2 parts, 6.5 parts, 6.8 parts, 7 parts, 7.2 parts, 7.5 parts, 7.8 parts, etc., or any range formed by the above values, and the present invention is not limited thereto.

[0014] Specifically, polyethylene accounts for no less than 69.7% of the mass of the polyethylene composite material. More specifically, polyethylene accounts for 69.7-75.2% of the mass of the polyethylene composite material.

[0015] Specifically, the ethylene vinyl acetate copolymer accounts for 4.5-8.7% of the mass of the polyethylene composite material.

[0016] Preferably, the melt flow rate of the ethylene vinyl acetate copolymer at 190°C and 2.16 kg can be 13 g / 10 min, 16 g / 10 min, 18 g / 10 min, 20 g / 10 min, 22 g / 10 min, 24 g / 10 min, 26 g / 10 min, 28 g / 10 min, 30 g / 10 min, 35 g / 10 min, 38 g / 10 min, etc., or any range formed by the above values, such as 19-32 g / 10 min, 20-40 g / 10 min, etc., and the present invention is not limited thereto. Specifically, the test method for the melt flow rate of the ethylene vinyl acetate copolymer is GB / T 3682-2018.

[0017] Specifically, the D50 particle size of the silicate can be 3.2 μm, 3.5 μm, 3.8 μm, 4.0 μm, 4.2 μm, 4.5 μm, 4.8 μm, 5.0 μm, 5.2 μm, 5.5 μm, 5.8 μm, etc., or any range formed by the above values, such as 3-4.8 μm, 4.8-6 μm, etc., and the present invention is not limited thereto. Specifically, the test method for the D50 particle size of the silicate is GB / T 19077-2024.

[0018] Preferably, the phosphorus-nitrogen flame retardant is selected from at least one of piperazine pyrophosphate, piperazine polyphosphate, melamine pyrophosphate, melamine polyphosphate, ammonium polyphosphate, aluminum hypophosphite, melamine cyanurate, and a mixture of melamine.

[0019] More preferably, the phosphorus-nitrogen flame retardant is selected from at least one mixture of piperazine pyrophosphate, aluminum hypophosphite, and melamine cyanurate. Herein, the halogen-free flame-retardant polyethylene composite material exhibits low total smoke production and superior aging resistance.

[0020] Specifically, the mass ratio of aluminum hypophosphite to melamine cyanurate is 1-3:1-3.

[0021] Preferably, the silicate is selected from sepiolite powder. Under this preferred embodiment, the halogen-free flame-retardant polyethylene composite material has lower total heat release, lower total smoke production, and better aging resistance.

[0022] Preferably, the polyethylene is at least one of linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE).

[0023] Preferably, the melt flow rate of the polyethylene at 190°C and 2.16 kg is 18-60 g / 10 min. Specifically, the melt flow rate of the polyethylene at 190°C and 2.16 kg is 20-55 g / 10 min. More specifically, the melt flow rate of the polyethylene at 190°C and 2.16 kg can be 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, 45 g / 10 min, 50 g / 10 min, etc., or any range formed by the above values, such as 25-55 g / 10 min, 20-60 g / 10 min; the present invention is not limited thereto. Specifically, the test method for the melt flow rate of the polyethylene is GB / T 3682-2018.

[0024] Preferably, the halogen-free flame-retardant polyethylene composite material further includes at least one of an antioxidant and a lubricant.

[0025] Preferably, the antioxidant is at least one of hindered phenolic antioxidants and phosphite antioxidants. Specifically, the antioxidant includes, but is not limited to, at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 2,6-di-tert-butyl-p-cresol, tris(2,4-di-tert-butylphenyl) phosphite, and bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite.

[0026] Preferably, the lubricant is at least one of stearic acid lubricants or amide lubricants. Specifically, the lubricant includes, but is not limited to, at least one of calcium stearate, zinc stearate, glyceryl stearate, ethylene bis-stearamide, oleamide, and erucamide.

[0027] Specifically, by weight, the halogen-free flame-retardant polyethylene composite material includes 0-1 parts of antioxidant. Specifically, the halogen-free flame-retardant polyethylene composite material includes 0.1-1 parts of antioxidant.

[0028] Specifically, by weight, the halogen-free flame-retardant polyethylene composite material includes 0-1 parts of lubricant. Specifically, the halogen-free flame-retardant polyethylene composite material includes 0.1-1 parts of lubricant.

[0029] Furthermore, this invention claims protection for a method for preparing a halogen-free flame-retardant polyethylene composite material, wherein the raw materials are mixed evenly, melt-extruded, and the halogen-free flame-retardant polyethylene composite material is obtained.

[0030] Preferably, a twin-screw extruder is used for melt extrusion, and the length-to-diameter ratio of the twin-screw extruder is 40-48:1. Preferably, the melt extrusion temperature is 140-180℃.

[0031] Furthermore, this invention claims protection for an indoor simulated decorative product prepared using the above-mentioned halogen-free flame-retardant polyethylene composite material.

[0032] Specifically, the indoor simulated decorative products can be decorative plants, such as artificial grass, artificial flowers, and artificial leaves.

[0033] Compared with the prior art, the present invention has the following beneficial effects: This invention combines phosphorus-nitrogen flame retardants, specific types of silicates, and ethylene vinyl acetate copolymers, and controls the D50 particle size of the silicates, the melt flow rate of the ethylene vinyl acetate copolymers, and the vinyl acetate content, so that the prepared halogen-free flame-retardant polyethylene composite material has excellent flame retardant properties, bending resistance, and good aging resistance. Detailed Implementation

[0034] The present invention will be further described below with reference to the specification and specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in this technical field.

[0035] Polyethylene 1, melt flow rate of 20 g / 10 min at 190℃ and 2.16 kg, LLDPE M2320, Sinopec.

[0036] The melt flow rate of polyethylene 2 at 190℃ and 2.16kg is 55g / 10min. LDPE 1850A, Maoming Petrochemical.

[0037] Phosphorus-nitrogen flame retardant 1, piperazine pyrophosphate, FP-2200, from Japan's Adico.

[0038] Phosphorus-nitrogen flame retardant 2 is a mixture of aluminum hypophosphite and melamine cyanurate in a mass ratio of 1:1. Aluminum hypophosphite, M-116, Shanghai Lidao; melamine cyanurate, Zhejiang Xusen.

[0039] Phosphorus-nitrogen flame retardant 3, melamine polyphosphate, MPP, Zhenjiang Xingxing flame retardant.

[0040] Silicate 1, sepiolite powder, with a D50 particle size of 1 μm. The method for obtaining silicate 1 is as follows: sepiolite powder (Yongbang sepiolite, with a D50 particle size of 15 μm) is ground to obtain silicate 1 with a D50 particle size of 1 μm.

[0041] Silicate 2, sepiolite powder, with a D50 particle size of 3 μm. The method for obtaining silicate 2 is the same as that for silicate 1.

[0042] Silicate 3, sepiolite powder, with a D50 particle size of 4.8 μm. The method for obtaining silicate 3 is the same as that for silicate 1.

[0043] Silicate 4, sepiolite powder, with a D50 particle size of 6 μm. The method for obtaining silicate 4 is the same as that for silicate 1.

[0044] Silicate 5, sepiolite powder, with a D50 particle size of 10 μm. The method for obtaining silicate 5 is the same as that for silicate 1.

[0045] Silicate 6, calcium silicate, D50 particle size 3.8μm, Jiangxi Kete Fine Powder.

[0046] Talc powder, D50 particle size 4.2μm, commercially available.

[0047] Magnesium hydroxide, D50 particle size 5.2μm, commercially available.

[0048] Ethylene-vinyl acetate copolymer 1, with a melt flow rate of 19 g / 10 min at 190 °C and 2.16 kg, and a vinyl acetate content of 25%, ELVAX TM 350, Dow Chemical.

[0049] Ethylene-vinyl acetate copolymer 2, with a melt flow rate of 25 g / 10 min at 190°C and 2.16 kg, and a vinyl acetate content of 28%, ELVAX TM 3180, Dow Chemical.

[0050] Ethylene-vinyl acetate copolymer 3, with a melt flow rate of 32 g / 10 min at 190°C and 2.16 kg, and a vinyl acetate content of 22.5%, ELVAX TM 3200-2, Dow Chemical.

[0051] Ethylene-vinyl acetate copolymer 4, with a melt flow rate of 6 g / 10 min at 190°C and 2.16 kg, and a vinyl acetate content of 28%, ELVAX TM 3175, Dow Chemical.

[0052] Ethylene-vinyl acetate copolymer 5, with a melt flow rate of 150 g / 10 min at 190 °C and 2.16 kg, a vinyl acetate content of 28%, ELVAX™ 220W, Dow Chemical.

[0053] Ethylene-vinyl acetate copolymer 6, with a melt flow rate of 30 g / 10 min at 190°C and 2.16 kg, and a vinyl acetate content of 18%, ELVAX TM 3176, Dow Chemical.

[0054] Ethylene-vinyl acetate copolymer 7, with a melt flow rate of 20 g / 10 min at 190 °C and 2.16 kg, and a vinyl acetate content of 33%, Lotte VC710, Lotte Korea.

[0055] Ethylene-octene copolymer, melt flow rate of 30 g / 10 min at 190 °C and 2.16 kg, POEENGAGE 8402, Dow Chemical.

[0056] Antioxidant 1, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid], commercially available.

[0057] Antioxidant 2, tris(2,4-di-tert-butylphenyl) phosphite, commercially available.

[0058] Lubricant, erucamide, commercially available.

[0059] Unless otherwise specified, all components (such as antioxidants and lubricants) used in the parallel embodiments and comparative examples are the same commercially available products.

[0060] Examples 1-11 A halogen-free flame-retardant polyethylene composite material is prepared by the following steps: According to the weight proportions listed in Table 1, each raw material is placed in a high-speed mixer at a mixing speed of 1000 rpm for 4 minutes. The resulting mixture is then added to a twin-screw extruder (the length-to-diameter ratio of the twin-screw extruder is 40:1). The temperatures in each zone are set to 150℃, 150℃, 155℃, 165℃, 170℃, 175℃, 170℃, and 165℃. The mixture is then extruded and granulated to obtain the halogen-free flame-retardant polyethylene composite material.

[0061] Table 1

[0062] Comparative Examples 1-14 The weight proportions of raw materials used in the following comparative examples are shown in Tables 2 and 3. The preparation method is the same as that in Example 1 above.

[0063] Table 2

[0064] Table 3

[0065] Test case The halogen-free flame-retardant polyethylene composite materials obtained in the above embodiments and comparative examples were used to perform relevant experimental tests on injection-molded samples of 300mm*90mm*3mm. The specific test items and test methods are as follows: (1) Heat release test: According to EN 13823 standard, a fire scenario is simulated by a single combustible material to obtain the total heat release (MJ / KG) of the sample within 600 seconds of THR600s; the requirement is to reach at least Class B: THR600s≤7.5 MJ / KG.

[0066] (2) Smoke emission test: According to EN 13823 standard: the total smoke production (m³) of the sample within 600 seconds (TSP600s) was obtained. 2 Total smoke production is required to be <50m³. 2 .

[0067] (3) Bending resistance and whitening test: Halogen-free flame-retardant polyethylene composite material was injection molded to obtain a green leaf shape with a thickness of about 0.4 mm. It was cut into 50 mm * 50 mm pieces and repeatedly folded in half 50 times in an environment of 23℃. The creases at the fold lines were observed. The creases were graded according to their obviousness as follows: Grade 1: obvious creases; Grade 2: some creases; Grade 3: slight creases; Grade 4: very slight creases; Grade 5: no creases visible.

[0068] (4) Xenon lamp aging test: A 100*100*2mm thick square plate was obtained by injection molding of polyethylene composite material. The plate was aged for 1000 hours according to the test conditions of ISO-4892-2 Cycle 1. The color difference value ΔE before and after aging was tested.

[0069] The test results are shown in Table 4 below.

[0070] Table 4

[0071] As shown in Table 4 above, the halogen-free flame-retardant polyethylene composite material provided by this invention has low total heat release and total smoke production, and excellent bending resistance and aging resistance. More specifically, the total heat release is ≤3.8 MJ / KG, and the total smoke production is ≤32 m³ / kg. 2 Crease grade ≥ 5, △E ≤ 2.1.

[0072] As can be seen from Examples 1 and 3-4, when piperazine pyrophosphate, or a mixture of aluminum hypophosphite and melamine cyanurate is used, the halogen-free flame-retardant polyethylene composite material has a low total smoke production and superior aging resistance.

[0073] As can be seen from Examples 1 and 7, compared with calcium silicate, when sepiolite powder is used, the halogen-free flame-retardant polyethylene composite material has a lower total heat release, a lower total smoke production, and better aging resistance.

[0074] As can be seen from Example 1 and Comparative Examples 1-2, when the D50 particle size of silicate is within a specific range, the halogen-free flame-retardant polyethylene composite material has lower total heat release, lower total smoke production, and better bending resistance and aging resistance.

[0075] As can be seen from Example 1 and Comparative Example 3, the technical effects of the present invention cannot be achieved by using other fillers such as talc.

[0076] As can be seen from Examples 1 and Comparative Examples 4-7, when the melt flow rate of the ethylene vinyl acetate copolymer and the vinyl acetate content are within a specific range, the halogen-free flame-retardant polyethylene composite material has lower total heat release, lower total smoke production, and better bending resistance and aging resistance.

[0077] As can be seen from Example 1 and Comparative Example 8, using other ethylene-octene copolymers as the dispersing components in the system cannot achieve a good dispersion effect, making the halogen-free flame-retardant polyethylene composite material unable to meet the requirements.

[0078] As can be seen from Examples 1 and Comparative Examples 9-11, when the polyethylene composite material system lacks silicates, phosphorus-nitrogen flame retardants, or ethylene vinyl acetate copolymers, it is difficult to achieve the technical effects of the present invention.

[0079] As can be seen from Examples 1, 12 and 13, it is difficult to achieve the technical effect of the present invention when the amount of ethylene vinyl acetate copolymer is too much or too little.

[0080] As can be seen from Example 1 and Comparative Example 14, using magnesium hydroxide to replace sepiolite powder cannot achieve the technical effect of the present invention.

[0081] The foregoing examples are merely illustrative, used to explain some features of the method described in this invention. The appended claims are intended to claim the broadest possible scope, and the embodiments presented herein are demonstrated by the applicant's actual experimental results. Therefore, the applicant intends that the appended claims are not limited by the selection of examples illustrating the features of the invention. Some numerical ranges used in the claims also include sub-ranges within them, and variations within these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A halogen-free flame-retardant polyethylene composite material, characterized in that, By weight, it comprises the following components: 68-84 parts polyethylene, 16-20 parts phosphorus-nitrogen flame retardant, 0.8-1.5 parts silicate, and 5-8 parts ethylene-vinyl acetate copolymer. The ethylene vinyl acetate copolymer has a melt flow rate of 10-40 g / 10 min at 190°C and 2.16 kg; the vinyl acetate content in the ethylene vinyl acetate copolymer is 22-28%. The silicate is selected from at least one of aluminum silicate, calcium silicate, and sepiolite powder; the D50 particle size of the silicate is 3-6 μm.

2. The halogen-free flame-retardant polyethylene composite material according to claim 1, characterized in that, The phosphorus-nitrogen flame retardant is selected from at least one of piperazine pyrophosphate, piperazine polyphosphate, melamine pyrophosphate, melamine polyphosphate, ammonium polyphosphate, aluminum hypophosphite, melamine cyanurate, and a mixture of melamine. Preferably, the phosphorus-nitrogen flame retardant is selected from at least one of a mixture of piperazine pyrophosphate, aluminum hypophosphite, and melamine cyanurate.

3. The halogen-free flame-retardant polyethylene composite material according to claim 2, characterized in that, The mass ratio of aluminum hypophosphite to melamine cyanurate is 1-3:1-3.

4. The halogen-free flame-retardant polyethylene composite material according to claim 1, characterized in that, The silicate is selected from sepiolite powder.

5. The halogen-free flame-retardant polyethylene composite material according to claim 1, characterized in that, The polyethylene is at least one of linear low-density polyethylene and low-density polyethylene.

6. The halogen-free flame-retardant polyethylene composite material according to claim 1, characterized in that, The polyethylene has a melt flow rate of 18-60 g / 10 min at 190°C and 2.16 kg.

7. The halogen-free flame-retardant polyethylene composite material according to claim 1, characterized in that, The halogen-free flame-retardant polyethylene composite material also includes at least one of antioxidants and lubricants; Preferably, the antioxidant is at least one of hindered phenolic antioxidants and phosphite antioxidants; Preferably, the lubricant is at least one of stearic acid lubricants and amide lubricants.

8. The method for preparing the halogen-free flame-retardant polyethylene composite material according to any one of claims 1-7, characterized in that, The raw materials are mixed evenly, melt-extruded, and the halogen-free flame-retardant polyethylene composite material is prepared.

9. An indoor simulated decorative product, characterized in that, It is prepared using the halogen-free flame-retardant polyethylene composite material according to any one of claims 1-7.

10. The interior simulated decorative product according to claim 9, characterized in that, Indoor simulated decorative products include at least one of artificial grass, artificial flowers, and artificial leaves.

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