A polyolefin composite material and its preparation method and application

Abstract

The present invention discloses a polyolefin composite material, its preparation method, and application, belonging to the field of polymer materials technology. The polyolefin composite material comprises the following components in parts by weight: 18-32 parts of polyolefin resin, 19-31 parts of vinyl coupling agent-modified metal powder, 19-31 parts of nitrogen-phosphorus flame retardant, 4.5-11 parts of graphite, and 0.9-5.2 parts of an interface modifier. The vinyl coupling agent-modified metal powder comprises a vinyl coupling agent and a metal powder, wherein the metal powder comprises at least one of carbonyl iron powder, reduced iron powder, electrolytic iron powder, and iron-based alloy powder. The polyolefin resin, vinyl coupling agent-modified metal powder, nitrogen-phosphorus flame retardant, graphite, and interface modifier work together to produce a composite material having excellent electromagnetic shielding and flame retardant properties. The polyolefin material is suitable for the preparation of electronic components, particularly electrical control boxes, lithium battery packs, and protective housings for electronic appliances.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a polyolefin composite material and a preparation method and application thereof. Background Art

[0002] With the rapid development of the electronic information industry and the dramatic increase in electronic products, the electromagnetic interference they generate is becoming increasingly serious. In the electrical and electronic field, sophisticated electronic equipment and components are easily damaged by electromagnetic interference, placing higher demands on the electromagnetic shielding performance of materials. Halogen-free flame-retardant polyolefin, a material widely used in the electrical and electronic field, has significant implications for improving its electromagnetic shielding performance.

[0003] The global market for electromagnetic shielding materials is expanding, further driving the research and development of halogen-free flame-retardant polypropylene (HFP) with electromagnetic shielding properties. HFP boasts environmental friendliness, low toxicity, excellent thermal stability, and flame retardancy. While meeting flame retardancy requirements, it also effectively reduces electromagnetic interference, ensuring the proper operation of electronic equipment.

[0004] So far, there has been little research on the electromagnetic shielding of halogen-free flame-retardant polyolefins. Generally, modified carbon black is added to absorb or reflect electromagnetic waves. However, the electromagnetic shielding effect of carbon black is relatively limited, and a large amount of carbon black is often required to significantly improve the electromagnetic shielding performance. However, since carbon black has a significant impact on the flame retardant properties of halogen-free flame-retardant polypropylene, it is impossible to have both excellent electromagnetic shielding and flame retardant properties. There is an urgent need to develop a halogen-free flame-retardant polyolefin material with excellent electromagnetic shielding performance.

[0005] In view of this, this application is filed. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a polyolefin composite material and its preparation method and application. The polyolefin composite material has excellent electromagnetic shielding performance and flame retardant properties. The polyolefin material is suitable for preparing electronic components, especially for preparing electric control boxes, lithium battery packs and electronic and electrical protective housings.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A polyolefin composite material comprises the following components in parts by weight: 18 to 32 parts of a polyolefin resin, 19 to 31 parts of a vinyl coupling agent-modified metal powder, 19 to 31 parts of a nitrogen-phosphorus flame retardant, 4.5 to 11 parts of graphite, and 0.9 to 5.2 parts of an interface improver;

[0009] The vinyl coupling agent modified metal powder comprises a vinyl coupling agent and metal powder, and the metal powder comprises at least one of carbonyl iron powder, reduced iron powder, electrolytic iron powder, and iron-based alloy powder.

[0010] The present invention creatively combines the above-mentioned raw materials, and under the joint action of polyolefin resin, vinyl coupling agent modified metal powder, nitrogen-phosphorus flame retardant, graphite, and interface improver, obtains excellent electromagnetic shielding performance and flame retardant properties. The polyolefin material is suitable for preparing electronic components, especially for preparing electric control boxes, lithium battery packs and electronic and electrical protective housings.

[0011] Among them, the vinyl coupling agent modified metal powder of the present invention has excellent electromagnetic shielding performance, can effectively increase the number of reflections of electromagnetic waves, can effectively improve the efficiency of electromagnetic absorption and reflection, and is combined with a polar nitrogen-phosphorus flame retardant to effectively reduce the transmission ability of electromagnetic waves in the material, thereby jointly improving the electromagnetic shielding performance; the special layered structure, expandability and high electrical conductivity of graphite enable it to reflect and absorb electromagnetic waves, reducing the intensity of electromagnetic waves, and at the same time, the vinyl coupling agent modified metal powder has a certain polar combustion property. During the combustion process, the vinyl coupling agent modified metal powder combustion can A large amount of heat is released, which prompts the phosphorus-nitrogen flame retardant to decompose rapidly, releasing a large amount of non-toxic gas that can inhibit the spread of flames, which expands to form a compound with a sponge-like foam structure. Under the action of graphite, a porous expanded carbon layer is formed. The metal powder has a strong adsorption effect. The formed porous expanded carbon layer combines with the metal oxide at high temperature and is deposited on the surface of the material, increasing the density of the carbon layer, reducing the oxygen concentration around the ignition source, and inhibiting the continued combustion. Under the synergistic effect of the vinyl coupling agent modified metal powder, nitrogen-phosphorus flame retardant, and graphite, the electromagnetic shielding performance and flame retardant properties of the polyolefin composite material are significantly improved.

[0012] The polyolefin resin is used in an amount of 18 to 32 parts, for example, 18 parts, 20 parts, 22 parts, 25 parts, 26 parts, 28 parts, 30 parts, 32 parts or a range consisting of any two of these values.

[0013] Preferably, the amount of the polyolefin resin is 20 to 30 parts.

[0014] The amount of the vinyl coupling agent modified metal powder is 19 to 31 parts, for example, 19 parts, 20 parts, 22 parts, 25 parts, 26 parts, 28 parts, 30 parts, 31 parts or a range consisting of any two of these values.

[0015] Preferably, the amount of the vinyl coupling agent modified metal powder is 20 to 30 parts.

[0016] The amount of the nitrogen-phosphorus flame retardant is 19 to 31 parts, for example, 19 parts, 20 parts, 22 parts, 25 parts, 26 parts, 28 parts, 30 parts, 31 parts or a range consisting of any two of these values.

[0017] Preferably, the amount of the nitrogen-phosphorus flame retardant is 20-30 parts.

[0018] The amount of graphite is 4.5 to 11 parts, such as 4.5 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 10 parts or a range consisting of any two of the values.

[0019] Preferably, the amount of graphite used is 5 to 10 parts.

[0020] The amount of the interface improver is 0.9 to 5.2 parts, for example, 0.9 parts, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 5.2 parts or a range consisting of any two of these values.

[0021] Preferably, the amount of the interface improver is 1 to 5 parts.

[0022] Preferably, the polyolefin composite material comprises the following components in parts by weight: 20-30 parts of polyolefin resin, 20-30 parts of vinyl coupling agent modified metal powder, 20-30 parts of nitrogen-phosphorus flame retardant, 5-10 parts of graphite, and 1-5 parts of interface improver.

[0023] Wherein, in the polyolefin composite material, the weight percentage of the polyolefin resin is not less than 20%.

[0024] Preferably, in the polyolefin composite material, the weight percentage of the polyolefin resin is 20-40%, for example, it can be 20%, 22%, 25%, 26%, 28%, 30%, 32%, 35%, 36%, 38%, 40% or a range consisting of any two of these values.

[0025] Preferably, in the polyolefin composite material, the weight percentage of the polyolefin resin is 20-30%.

[0026] The polyolefin resin of the present invention includes at least one of polyethylene (HDPE, LDPE, LLDPE, metallocene PE, etc.), polypropylene (homopolymer polypropylene, block copolymer polypropylene, random copolymer polypropylene), ethylene-vinyl acetate copolymer, and ethylene-octene copolymer.

[0027] Preferably, the polypropylene has a melt flow rate of 0.1 to 50 g / 10 min (the melt flow rate is tested in accordance with GB / T 3682-2000 under the conditions of 230° C. and 2.16 kg).

[0028] Wherein, in the polyolefin composite material, the weight percentage of the vinyl coupling agent modified metal powder is not less than 20%.

[0029] Preferably, in the polyolefin composite material, the weight percentage of the vinyl coupling agent modified metal powder is 20-35%, for example, it can be 20%, 22%, 25%, 26%, 28%, 30%, 32%, 35% or a range consisting of any two values ​​therein.

[0030] Preferably, in the polyolefin composite material, the weight percentage of the vinyl coupling agent modified metal powder is 25-30%.

[0031] Preferably, the average particle size of the vinyl coupling agent modified metal powder is 0.5~50μm, for example, it can be 0.5μm, 1μm, 2μm, 4μm, 5μm, 6μm, 8μm, 10μm, 12μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm or a range consisting of any two values ​​therein.

[0032] Preferably, the average particle size of the vinyl coupling agent modified metal powder is 1-15 μm.

[0033] Preferably, the average particle size of the vinyl coupling agent modified metal powder is 4-10 μm.

[0034] Preferably, the mass ratio of the vinyl coupling agent to the metal powder is (0.1~1):(99~99.9).

[0035] Preferably, the vinyl coupling agent includes at least one of vinyltris(2-methoxyethoxy)silane, vinyltrimethoxysilane, and vinyltriethoxysilane.

[0036] It should be noted that the present invention can adopt conventional methods in the prior art to prepare vinyl coupling agent and metal powder into vinyl coupling agent-modified metal powder. The present invention is not limited to the preparation method. The preparation method of vinyl coupling agent-modified metal powder is exemplified below.

[0037] Method 1: Place the vinyl coupling agent and metal powder into a high-speed mixer, stir evenly at 50-90°C (the speed can be 50-400 rpm, and the time can be 0.5-6 hours), and ball mill and sieve to the target particle size to obtain vinyl coupling agent modified metal powder.

[0038] Method 2: Disperse the vinyl coupling agent in an ethanol solution (concentration of 10~90wt%), add metal powder, stir evenly (heat to 50~80℃ to increase the speed), filter, dry, and ball mill to obtain the target particle size to obtain vinyl coupling agent modified metal powder.

[0039] Method 3: Disperse the vinyl coupling agent in an ethanol solution (concentration of 10~90wt%), spray the mixture evenly on the surface of the metal powder, dry it, and ball mill and sieve it to the target particle size to obtain vinyl coupling agent modified metal powder.

[0040] Preferably, the metal powder includes carbonyl iron powder. In particular, when carbonyl iron powder is used, the carbonyl iron powder is prepared using liquid Fe(CO)5. The iron powder has high sphericity and the inner layer has an onion-like layered structure, which can increase the number of reflections and further improve the electromagnetic shielding performance.

[0041] Preferably, the particle size of the graphite is 100-1000 mesh, for example, it can be 100 mesh, 200 mesh, 300 mesh, 400 mesh, 500 mesh, 600 mesh, 700 mesh, 800 mesh, 900 mesh, 1000 mesh or a range consisting of any two values ​​therein.

[0042] Preferably, the particle size of the graphite is 400-600 mesh.

[0043] Preferably, the nitrogen-phosphorus flame retardant includes at least one of ammonium polyphosphate, modified ammonium polyphosphate, ammonium hypophosphite, triphenyl phosphate, melamine polyphosphate, melamine phosphate, melamine pyrophosphate, melamine cyanurate, melamine hypophosphite, a complex of melamine pyrophosphate and piperazine pyrophosphate, piperazine polyphosphate, and piperazine hypophosphite.

[0044] Preferably, the interface improver includes at least one of maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene, acrylic acid grafted polypropylene, and acrylic acid grafted polyethylene.

[0045] Preferably, the invention further comprises 0-1 parts by weight of an antioxidant and 0-2 parts by weight of a processing aid.

[0046] Preferably, the antioxidant includes at least one of a thioester antioxidant, a hindered phenol antioxidant, a hydroxylamine antioxidant, a phosphite antioxidant, and a phosphate antioxidant.

[0047] Preferably, the thioester antioxidant includes at least one of dialkyl thiodipropionate or pentaerythritol tetrakis (3-laurylthiopropionate).

[0048] Preferably, the hindered phenol antioxidant includes at least one of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester, tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl ester, ethylene bis(oxyethylene)bis[3-(5-tert-butyl-4-hydroxy-m-tolyl)propionate] or 3,9-bis[1,1-dimethyl-2-[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane.

[0049] Preferably, the hydroxylamine antioxidant includes bis(octadecyl)hydroxylamine.

[0050] Preferably, the phosphite antioxidant includes at least one of tris(2,4-di-tert-butylphenyl)phosphite and pentaerythritol bis(2,4-tert-butylphenyl)diphosphite.

[0051] Preferably, the phosphate antioxidant includes bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphate.

[0052] Preferably, the processing aid includes at least one of solid paraffin, liquid paraffin, polyolefin wax, calcium stearate, magnesium stearate, zinc stearate, barium stearate, ethylene glycol stearate, glyceryl stearate or pentaerythritol stearate, erucamide, methylene bisstearamide, and N,N-ethylene bisstearamide.

[0053] Preferably, the polyolefin composite material of the present invention may further include at least one of mineral powder, colorant, weathering agent, antistatic agent, and ultraviolet light absorber.

[0054] The polyolefin composite material of the present invention may include mineral powder. Suitable mineral powders include, but are not limited to, calcium carbonate, mica, kaolin, magnesium hydroxide, boehmite, and combinations thereof.

[0055] The polyolefin composite material of the present invention may include a colorant. Suitable colorants include, but are not limited to, carbon black, titanium dioxide, zinc sulfide, iron red, titanium yellow, and combinations thereof.

[0056] The polyolefin composite material of the present invention may include a weathering agent. Suitable weathering agents include but are not limited to hindered amine light stabilizers.

[0057] The polyolefin composite material of the present invention may include an antistatic agent. Suitable antistatic agents include, but are not limited to, zinc oxide, manganese dioxide, chromium trioxide, and combinations thereof.

[0058] The polyolefin composite material of the present invention may include an ultraviolet light absorber. Suitable ultraviolet light absorbers include, but are not limited to, hydroxybenzophenones, benzotriazoles, hydroxybenzotriazines, cyanoacrylates, nanoscale inorganic materials (such as titanium oxide, cerium oxide, and zinc oxide), and combinations thereof.

[0059] The present invention also provides a method for preparing a polyolefin composite material, comprising the following steps:

[0060] The polyolefin resin, vinyl coupling agent modified metal powder and interface improver are first melt-blended and then mixed with other components and melt-extruded to obtain a polyolefin composite material.

[0061] The present invention also provides a use of the polyolefin composite material in the preparation of electronic components, household items, household appliances, gardening equipment, medical technology equipment, motor vehicle parts, vehicle body parts or power tool parts.

[0062] In particular, the polypropylene composite material of the present invention has excellent electromagnetic shielding and flame retardant properties, and is very suitable for preparing parts with excellent electromagnetic shielding and flame retardant properties; specifically, it can be used to prepare electronic control boxes, battery packs, electronic and electrical protective housings, and electronic components.

[0063] The present invention also provides an electronic component, which is prepared using the above-mentioned polyolefin composite material.

[0064] The beneficial effects of the present invention are as follows: under the combined action of polyolefin resin, vinyl coupling agent modified metal powder, nitrogen-phosphorus flame retardant, graphite, and interface improver, the present invention obtains excellent electromagnetic shielding performance and flame retardant performance. The polyolefin material is suitable for preparing electronic components, especially for preparing electric control boxes, lithium battery packs, and electronic and electrical protective housings. DETAILED DESCRIPTION

[0065] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0066] In this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0067] In this application, when referring to numerical ranges, unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges subsumed therein.

[0068] The raw materials used in the embodiments and comparative examples are described as follows:

[0069] Polyolefin resin-1: polypropylene resin, brand PP Z30S, manufactured by CNOOC and Shell Petrochemical Co., Ltd.

[0070] Polyolefin resin-2: polypropylene resin, brand PP LH-K9829H, manufacturer: Lihe Zhixin New Materials Technology Co., Ltd.

[0071] Polyolefin resin-3: polyethylene resin, brand LDPE M1850A, manufactured by China Petrochemical Corporation.

[0072] Vinyl coupling agent modified carbonyl iron powder-1: with an average particle size of 10 μm, comprising vinyl triethoxysilane and carbonyl iron powder in a mass ratio of 0.6:99.4.

[0073] Vinyl coupling agent modified carbonyl iron powder-2: with an average particle size of 5 μm, comprising vinyl triethoxysilane and carbonyl iron powder in a mass ratio of 0.6:99.4.

[0074] Vinyl coupling agent modified carbonyl iron powder-3: average particle size is 15 μm, including vinyl triethoxysilane and carbonyl iron powder in a mass ratio of 0.6:99.4.

[0075] Vinyl coupling agent modified carbonyl iron powder-4: average particle size is 1 μm, including vinyl triethoxysilane and carbonyl iron powder in a mass ratio of 0.6:99.4.

[0076] Vinyl coupling agent modified carbonyl iron powder-5: average particle size is 10 μm, including vinyl triethoxysilane and carbonyl iron powder in a mass ratio of 0.2:99.8.

[0077] Vinyl coupling agent modified carbonyl iron powder-6: average particle size is 10 μm, including vinyl triethoxysilane and carbonyl iron powder in a mass ratio of 0.1:99.9.

[0078] Vinyl coupling agent modified carbonyl iron powder-7: average particle size is 10 μm, including vinyl triethoxysilane and carbonyl iron powder in a mass ratio of 1:99.

[0079] The preparation methods of vinyl coupling agent modified carbonyl iron powders-1~7 all include the following steps: placing carbonyl iron powder and vinyltriethoxysilane into a high-speed mixer, stirring evenly at 80°C (speed of 200 rpm, time of 4 hours), ball milling and sieving to a target particle size, to obtain vinyl coupling agent modified carbonyl iron powders-1~7.

[0080] Vinyl coupling agent modified reduced iron powder: with an average particle size of 10 μm, comprising vinyl triethoxysilane and reduced iron powder in a mass ratio of 0.6:99.4.

[0081] In the preparation method of vinyl coupling agent-modified carbonyl iron powders 1-7, the carbonyl iron powders 1-7 can be obtained by controlling the ratio of carbonyl iron powder to vinyltriethoxysilane and adjusting the ball milling and screening parameters. The carbonyl iron powder used in the preparation method is sourced from Xinxiang Sanyi New Materials, brand PF-01.

[0082] The preparation method of vinyl coupling agent modified reduced iron powder is the same as that of vinyl coupling agent modified carbonyl iron powder-1, except that the type of iron powder is changed. The reduced iron powder comes from Xinxiang Sanyi New Materials, brand NF-19.

[0083] Graphite was purchased from Qingdao Yuanshengrun Graphite New Materials, model LC500. After grinding and screening, graphites 1 to 4 with different particle size distributions were obtained.

[0084] Graphite-1:400 mesh.

[0085] Graphite-2: 600 mesh.

[0086] Graphite-3: 100 mesh.

[0087] Graphite-4: 1000 mesh.

[0088] Phosphorus and nitrogen flame retardant-1: ammonium polyphosphate, brand CF-APP202C, manufacturer: Sichuan Changfeng Chemical Co., Ltd.

[0089] Phosphorus-nitrogen flame retardant-2: melamine phosphate, brand FR-MPP200, manufacturer is Guangzhou Yinyuan New Materials.

[0090] Interface improver: Polypropylene grafted maleic anhydride, brand name GPM200B, manufacturer: Ningbo Nengzhiguang.

[0091] Antioxidant-1, Antioxidant 1010, commercially available.

[0092] Antioxidant-2: Antioxidant 168, commercially available.

[0093] Processing aid-1: calcium stearate, commercially available.

[0094] Processing aid-2: erucamide, commercially available.

[0095] Unless otherwise specified, the components and raw materials used in the examples and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0096] Examples 1 to 16 to Comparative Examples 1 to 7

[0097] The formulations of the polyolefin composite materials of Examples 1 to 16 and Comparative Examples 1 to 7 are shown in Table 1 and Table 2 (all parts by weight in the tables).

[0098] The preparation methods of the polyolefin composite materials of Examples 1 to 16 and Comparative Examples 1 to 7 all include the following steps:

[0099] According to the formula, polyolefin resin, vinyl coupling agent modified iron powder, interface improver, antioxidant and processing aid are mixed and added from the main feeding port of the twin-screw extruder, and then phosphorus-nitrogen flame retardant and graphite are added from the side feeding ports of the 5th to 7th sections of the twin-screw extruder, and melt extruded to obtain a polyolefin composite material.

[0100] Table 1

[0101]

[0102] Table 2

[0103]

[0104] Performance Testing

[0105] 1. Electromagnetic shielding performance test: Test the shielding effectiveness of planar materials according to standard GB / T 30142-2013.

[0106] 2. Flame retardant performance test: According to standard GB / T 10707, flame retardant performance is tested using a vertical burning tester and an oxygen index meter.

[0107] Table 3

[0108]

[0109] As can be seen from Table 3, the polyolefin composite material of the present invention has excellent electromagnetic shielding performance and flame retardant properties. The polyolefin material is suitable for preparing electronic components, especially for preparing electric control boxes, lithium battery packs and electronic and electrical protective housings. The electromagnetic shielding effectiveness is ≥32DB, the 1.5mm UL-94 vertical burning rating is V-0, and the oxygen index is ≥33%.

[0110] By comparing Example 1 with Comparative Examples 1 to 7, it can be seen that the vinyl coupling agent modified metal powder, nitrogen-phosphorus flame retardant, and graphite described in the present invention have a significant synergistic effect in improving electromagnetic shielding performance and flame retardant performance. Under the synergistic effect of the three, the electromagnetic shielding performance and flame retardant performance are significantly improved.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polyolefin composite material, characterized in that: The invention comprises the following components in parts by weight: 20 to 30 parts of polyolefin resin, 19 to 31 parts of vinyl coupling agent modified metal powder, 19 to 31 parts of nitrogen-phosphorus flame retardant, 4.5 to 11 parts of graphite, and 0.9 to 5.2 parts of interface improver; The vinyl coupling agent modified metal powder comprises a vinyl coupling agent and metal powder, wherein the metal powder comprises at least one of carbonyl iron powder, reduced iron powder and electrolytic iron powder; The average particle size of the vinyl coupling agent modified metal powder is 0.5-50 μm; The particle size of the graphite is 100-1000 mesh; The nitrogen-phosphorus flame retardant includes at least one of ammonium polyphosphate and melamine phosphate.

2. The polyolefin composite material according to claim 1, characterized in that The mass ratio of the vinyl coupling agent to the metal powder is (0.1-1): (99-99.9).

3. The polyolefin composite material according to claim 1, characterized in that The vinyl coupling agent includes at least one of vinyl tris(2-methoxyethoxy)silane, vinyl trimethoxysilane, and vinyl triethoxysilane.

4. The polyolefin composite material according to claim 1, characterized in that The interface improver includes at least one of maleic anhydride grafted polypropylene, maleic anhydride grafted polyethylene, acrylic acid grafted polypropylene, and acrylic acid grafted polyethylene.

5. The polyolefin composite material according to claim 1, characterized in that The invention also includes 0-1 parts by weight of an antioxidant and 0-2 parts by weight of a processing aid.

6. The method for preparing the polyolefin composite material according to any one of claims 1 to 5, characterized in that: The following steps are involved: The polyolefin resin, vinyl coupling agent modified metal powder and interface improver are first melt-blended and then mixed with other components and melt-extruded to obtain a polyolefin composite material.

7. Use of the polyolefin composite material according to any one of claims 1 to 5 in the preparation of electronic components, household goods, household appliances, gardening equipment, medical technology equipment, motor vehicle parts, body parts or power tool parts.

8. An electronic component, characterized in that: The polyolefin composite material is prepared using any one of claims 1 to 5.

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