Polyolefin composite material as well as preparation method and application thereof

Abstract

The invention discloses a polyolefin composite material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials, 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 a nitrogen-phosphorus flame retardant, 4.5-11 parts of graphite and 0.9-5.2 parts of an interface improver; 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. Under the combined action of the polyolefin resin, the vinyl coupling agent modified metal powder, the nitrogen-phosphorus flame retardant, the graphite and the interface improving agent, excellent electromagnetic shielding performance and flame retardant performance are obtained, and the polyolefin material is suitable for preparing electronic components, especially suitable for preparing electric control boxes, such as high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials, high-temperature-resistant materials and the like. The invention discloses a lithium battery pack and an electronic appliance protection shell.

Description

Technical Field

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

[0002] With the rapid development of the electronic information industry, the number of electronic products has increased sharply, and the resulting electromagnetic wave interference has become increasingly serious. In the field of electronics and electricity, precision electronic devices and components are easily damaged due to electromagnetic wave interference. Therefore, higher requirements are put forward for the electromagnetic shielding performance of materials. As a material widely used in the field of electronics and electricity, improving the electromagnetic shielding performance of halogen-free flame-retardant polyolefins is of great significance.

[0003] The global market scale of electromagnetic shielding materials is constantly expanding, which further promotes the research and development of halogen-free flame-retardant polypropylene with electromagnetic shielding effect. Halogen-free flame-retardant polypropylene has the characteristics of environmental protection, low toxicity, good thermal stability, excellent flame retardancy, etc. While meeting the flame retardant requirements, it can effectively reduce electromagnetic wave interference and provide guarantee for the normal operation of electronic devices.

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

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

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a polyolefin composite material, a preparation method thereof, and an application thereof. The polyolefin composite material has excellent electromagnetic shielding performance and flame retardant performance. The polyolefin material is suitable for preparing electronic components, especially suitable for preparing electronic control boxes, lithium battery packs, and electronic and electrical protection casings.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A polyolefin composite material, comprising 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-based flame retardant, 4.5-11 parts of graphite, and 0.9-5.2 parts of interface improver; The vinyl coupling agent-modified metal powder includes a vinyl coupling agent and a metal powder. The metal powder includes at least one of carbonyl iron powder, reduced iron powder, electrolytic iron powder, and iron-based alloy powder.

[0008] The present invention creatively combines the above raw materials. Under the combined action of polyolefin resin, vinyl coupling agent-modified metal powder, nitrogen-phosphorus-based flame retardant, graphite, and interface improver, a material with excellent electromagnetic shielding performance and flame retardant performance is obtained. The polyolefin material is suitable for the preparation of electronic components, especially for the preparation of electronic control boxes, lithium battery packs, and electronic and electrical protection casings.

[0009] 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, and can effectively improve the efficiency of electromagnetic absorption and reflection. Combining with the polar nitrogen-phosphorus-based flame retardant effectively reduces the transmission ability of electromagnetic waves in the material, jointly improving the electromagnetic shielding performance; the special layered structure, expandability, and high conductivity of graphite enable it to reflect and absorb electromagnetic waves, weakening the intensity of electromagnetic waves. At the same time, the vinyl coupling agent-modified metal powder has certain polar combustion properties. During the combustion process, the combustion of the vinyl coupling agent-modified metal powder can release a large amount of heat, prompting the rapid decomposition of the phosphorus-nitrogen-based flame retardant, releasing a large amount of non-toxic gas that can inhibit the spread of the flame, and forming a compound with a sponge-like foam structure through expansion. Under the action of graphite, a porous expanded carbon layer is formed. Moreover, the metal powder has a strong adsorption effect, and the formed porous expanded carbon layer combines with metal oxides at high temperatures and deposits on the material surface, increasing the density of the carbon layer, reducing the oxygen concentration around the ignition source, and inhibiting the continuous progress of combustion. Under the synergistic action of the vinyl coupling agent-modified metal powder, nitrogen-phosphorus-based flame retardant, and graphite, the electromagnetic shielding performance and flame retardant performance of the polyolefin composite material are significantly improved.

[0010] Among them, the dosage of the polyolefin resin is 18 - 32 parts, for example, it can be 18 parts, 20 parts, 22 parts, 25 parts, 26 parts, 28 parts, 30 parts, 32 parts, or the range composed of any two of these values.

[0011] Preferably, the dosage of the polyolefin resin is 20 - 30 parts.

[0012] Among them, the dosage of the vinyl coupling agent-modified metal powder is 19 - 31 parts, for example, it can be 19 parts, 20 parts, 22 parts, 25 parts, 26 parts, 28 parts, 30 parts, 31 parts, or the range composed of any two of these values.

[0013] Preferably, the dosage of the vinyl coupling agent-modified metal powder is 20 - 30 parts.

[0014] Among them, the dosage of the nitrogen-phosphorus-based flame retardant is 19 - 31 parts, for example, it can be 19 parts, 20 parts, 22 parts, 25 parts, 26 parts, 28 parts, 30 parts, 31 parts, or the range composed of any two of these values.

[0015] Preferably, the amount of the nitrogen-phosphorus based flame retardant is 20 to 30 parts.

[0016] Among them, the amount of the 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 the range composed of any two of these values.

[0017] Preferably, the amount of the graphite is 5 to 10 parts.

[0018] Among them, the amount of the interface improver is 0.9 to 5.2 parts, and can be, for example, 0.9 parts, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 5.2 parts or the range composed of any two of these values.

[0019] Preferably, the amount of the interface improver is 1 to 5 parts.

[0020] Preferably, the polyolefin composite material comprises the following components in parts by weight: 20 to 30 parts of polyolefin resin, 20 to 30 parts of vinyl coupling agent modified metal powder, 20 to 30 parts of nitrogen-phosphorus based flame retardant, 5 to 10 parts of graphite, 1 to 5 parts of interface improver.

[0021] Among them, in the polyolefin composite material, the weight percentage content of the polyolefin resin is not less than 20%.

[0022] Preferably, in the polyolefin composite material, the weight percentage content of the polyolefin resin is 20 to 40%, and can be, for example, 20%, 22%, 25%, 26%, 28%, 30%, 32%, 35%, 36%, 38%, 40% or the range composed of any two of these values.

[0023] Preferably, in the polyolefin composite material, the weight percentage content of the polyolefin resin is 20 to 30%.

[0024] Among them, the polyolefin resin in the present invention includes at least one of polyethylene (HDPE, LDPE, LLDPE, metallocene PE, etc.), polypropylene (homopolypropylene, block copolymerized polypropylene, random copolymerized polypropylene), ethylene-vinyl acetate copolymer, and ethylene-octene copolymer.

[0025] Preferably, it is polypropylene with a melt mass flow rate of 0.1 to 50 g / 10 min (the test standard for the melt mass flow rate is GB / T 3682-2000, and the test conditions are 230 °C, 2.16 kg).

[0026] Among them, in the polyolefin composite material, the weight percentage content of the vinyl coupling agent modified metal powder is not less than 20%.

[0027] Preferably, in the polyolefin composite material, the weight percentage content 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 composed of any two of these values.

[0028] Preferably, in the polyolefin composite material, the weight percentage content of the vinyl coupling agent-modified metal powder is 25-30%.

[0029] Preferably, the average particle size of the vinyl coupling agent-modified metal powder is 0.5-50 μm, for example, it can be 0.5 μm, 1 μm, 2 μm, 4 μm, 5 μm, 6 μm, 8 μm, 10 μm, 12 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, or a range composed of any two of these values.

[0030] Preferably, the average particle size of the vinyl coupling agent-modified metal powder is 1-15 μm.

[0031] Preferably, the average particle size of the vinyl coupling agent-modified metal powder is 4-10 μm.

[0032] Preferably, the mass ratio of the vinyl coupling agent to the metal powder is (0.1-1):(99-99.9).

[0033] Preferably, the vinyl coupling agent includes at least one of vinyltris(2-methoxyethoxy)silane, vinyltrimethoxysilane, and vinyltriethoxysilane.

[0034] It should be noted that in the present invention, the vinyl coupling agent and the metal powder can be prepared into the vinyl coupling agent-modified metal powder by conventional methods in the prior art. The present invention has no limitation on the preparation method. The following is an exemplary preparation method of the vinyl coupling agent-modified metal powder.

[0035] Method 1: Put the vinyl coupling agent and the metal powder into a high-speed mixer, stir evenly at 50-90 °C (the rotation speed can be 50-400 rpm, and the time can be 0.5-6 h), and perform ball milling and screening to the target particle size to obtain the vinyl coupling agent-modified metal powder.

[0036] Method 2: Disperse the vinyl coupling agent in an ethanol solution (concentration 10-90 wt%), add the metal powder, stir evenly (can be heated to 50-80 °C to increase the speed), filter, dry, perform ball milling and screening to the target particle size to obtain the vinyl coupling agent-modified metal powder.

[0037] Method 3: Disperse the vinyl coupling agent in an ethanol solution (concentration 10 - 90 wt%), evenly spray the mixture on the surface of the metal powder, dry, and ball mill and screen to the target particle size to obtain the vinyl coupling agent-modified metal powder.

[0038] Preferably, the metal powder includes carbonyl iron powder. Especially when using carbonyl iron powder, the carbonyl iron powder is prepared from liquid Fe(CO)5. The carbonyl iron powder has a high sphericity and a layered structure similar to an onion inside, which can increase the number of reflections and further improve the electromagnetic shielding performance.

[0039] 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 composed of any two of these values.

[0040] Preferably, the particle size of the graphite is 400 - 600 mesh.

[0041] 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, polyphosphazene piperazine, and piperazine hypophosphite.

[0042] 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.

[0043] Preferably, it further includes 0 - 1 part by weight of antioxidant and 0 - 2 parts by weight of processing aid.

[0044] Preferably, the antioxidant includes at least one of thioester antioxidants, hindered phenol antioxidants, hydroxylamine antioxidants, phosphite antioxidants, and phosphate antioxidants.

[0045] Preferably, the thioester antioxidant includes at least one of dialkyl thiodipropionate or pentaerythritol tetrakis(3 - laurylthiopropionate).

[0046] Preferably, the hindered phenol antioxidant includes at least one of pentaerythritol tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 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.

[0047] Preferably, the hydroxylamine antioxidant includes bis(octadecyl) hydroxylamine.

[0048] Preferably, the phosphite antioxidant includes at least one of tris(2,4-di-tert-butylphenyl) phosphite and pentaerythritol bis(di-2,4-tert-butylphenyl) diphosphite.

[0049] Preferably, the phosphate antioxidant includes bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphate.

[0050] 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, glycerol stearate, pentaerythritol stearate, erucamide, methylene bisstearamide, and N,N-ethylenebisstearamide.

[0051] 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.

[0052] The polyolefin composite material of the present invention may include mineral powder, and suitable mineral powders include but are not limited to calcium carbonate, mica, kaolin, magnesium hydroxide, boehmite, and combinations thereof.

[0053] The polyolefin composite material of the present invention may include colorant, and suitable colorants include but are not limited to carbon black, titanium dioxide, zinc sulfide, iron oxide red, titanium yellow, and combinations thereof.

[0054] The polyolefin composite material of the present invention may include weathering agent, and suitable weathering agents include but are not limited to hindered amine light stabilizers.

[0055] The polyolefin composite material of the present invention may include antistatic agent, and suitable antistatic agents include but are not limited to zinc oxide, manganese dioxide, chromium trioxide, and combinations thereof.

[0056] The polyolefin composite material described in the present invention may include an ultraviolet light absorber. Suitable ultraviolet light absorbers include, but are not limited to, hydroxydibenzophenones, benzotriazoles, hydroxybenzotriazines, cyanoacrylates, nano-scale inorganic materials (such as titanium oxide, cerium oxide, and zinc oxide), and combinations thereof.

[0057] The present invention also provides a method for preparing a polyolefin composite material, comprising the following steps: First, melt-blend the polyolefin resin, vinyl-coupling agent-modified metal powder, and interface improver, and then mix and melt-extrude with other components to obtain the polyolefin composite material.

[0058] The present invention also provides an application 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.

[0059] In particular, the polypropylene composite material described in the present invention has excellent electromagnetic shielding performance and flame retardancy. The polypropylene composite material is very suitable for preparing articles with excellent electromagnetic shielding performance and flame retardancy; specifically, it can be used to prepare electronic control boxes, battery packs, and electronic and electrical protection housings, and electronic components.

[0060] The present invention also provides an electronic component prepared from the above-mentioned polyolefin composite material.

[0061] The beneficial effects of the present invention are as follows: Under the combined action of the polyolefin resin, vinyl-coupling agent-modified metal powder, nitrogen-phosphorus-based flame retardant, graphite, and interface improver, the present invention obtains a polyolefin material with excellent electromagnetic shielding performance and flame retardancy. The polyolefin material is suitable for preparing electronic components, especially suitable for preparing electronic control boxes, lithium battery packs, and electronic and electrical protection housings. Detailed Embodiments

[0062] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0063] In the present application, among the technical features described in an open-ended manner, a closed technical solution composed of the listed features is included, and an open technical solution including the listed features is also included.

[0064] In this application, when it comes to numerical ranges, unless otherwise specified, the above 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 the range refers to integers, it includes every integer between the minimum and maximum values of the range. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein.

[0065] The raw materials used in the examples and comparative examples are described as follows: Polyolefin resin - 1: Polypropylene resin, grade PP Z30S, manufacturer: CNOOC and Shell Petrochemical Company Limited.

[0066] Polyolefin resin - 2: Polypropylene resin, grade PP LH - K9829H, manufacturer: Lihe Zhixin New Materials Technology Co., Ltd.

[0067] Polyolefin resin - 3: Polyethylene resin, grade LDPE M1850A, manufacturer: China Petroleum & Chemical Corporation.

[0068] Vinyl coupling agent - modified carbonyl iron powder - 1: The average particle size is 10 μm, including vinyltriethoxysilane and carbonyl iron powder with a mass ratio of 0.6:99.4.

[0069] Vinyl coupling agent - modified carbonyl iron powder - 2: The average particle size is 5 μm, including vinyltriethoxysilane and carbonyl iron powder with a mass ratio of 0.6:99.4.

[0070] Vinyl coupling agent - modified carbonyl iron powder - 3: The average particle size is 15 μm, including vinyltriethoxysilane and carbonyl iron powder with a mass ratio of 0.6:99.4.

[0071] Vinyl coupling agent - modified carbonyl iron powder - 4: The average particle size is 1 μm, including vinyltriethoxysilane and carbonyl iron powder with a mass ratio of 0.6:99.4.

[0072] Vinyl coupling agent - modified carbonyl iron powder - 5: The average particle size is 10 μm, including vinyltriethoxysilane and carbonyl iron powder with a mass ratio of 0.2:99.8.

[0073] Vinyl coupling agent - modified carbonyl iron powder - 6: The average particle size is 10 μm, including vinyltriethoxysilane and carbonyl iron powder with a mass ratio of 0.1:99.9.

[0074] Vinyl coupling agent - modified carbonyl iron powder - 7: The average particle size is 10 μm, including vinyltriethoxysilane and carbonyl iron powder with a mass ratio of 1:99.

[0075] The preparation methods of vinyl coupling agent modified carbonyl iron powders - 1 to 7 all include the following steps: Put carbonyl iron powder and vinyltriethoxysilane into a high-speed mixer, stir evenly at 80 °C (rotation speed is 200 rpm, and the time can be 4 h), grind and screen to the target particle size to obtain vinyl coupling agent modified carbonyl iron powders - 1 to 7.

[0076] Vinyl coupling agent modified reduced iron powder: The average particle size is 10 μm, including vinyltriethoxysilane and reduced iron powder with a mass ratio of 0.6:99.4.

[0077] In the preparation method of vinyl coupling agent modified carbonyl iron powders - 1 to 7, by controlling the ratio of carbonyl iron powder to vinyltriethoxysilane and by adjusting the grinding and screening parameters, vinyl coupling agent modified carbonyl iron powders - 1 to 7 can be obtained. The carbonyl iron powder in the preparation method of vinyl coupling agent modified carbonyl iron powders - 1 to 7 is sourced from Sanyi New Materials in Xinxiang City, with the brand PF - 01.

[0078] 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, only the type of iron powder needs to be changed. Among them, the reduced iron powder is sourced from Sanyi New Materials in Xinxiang City, with the brand NF - 19.

[0079] Graphite, purchased from Qingdao Yuanshengrun Graphite New Materials, model LC500, is obtained through grinding and screening to get graphites 1 to 4 with different particle size distributions.

[0080] Graphite - 1: 400 mesh.

[0081] Graphite - 2: 600 mesh.

[0082] Graphite - 3: 100 mesh.

[0083] Graphite - 4: 1000 mesh.

[0084] Phosphorus - nitrogen flame retardant - 1: Ammonium polyphosphate, brand CF - APP202C, manufacturer is Sichuan Changfeng Chemical Co., Ltd.

[0085] Phosphorus - nitrogen flame retardant - 2: Melamine phosphate, brand FR - MPP200, manufacturer is Guangzhou Yinyuan New Materials.

[0086] Interface improver: Polypropylene grafted maleic anhydride, brand GPM200B, manufacturer is Ningbo Nengzhiguang.

[0087] Antioxidant - 1, antioxidant 1010, commercially available.

[0088] Antioxidant - 2: Antioxidant 168, commercially available.

[0089] Processing aid - 1: Calcium stearate, commercially available.

[0090] Processing aid - 2: Erucamide, commercially available.

[0091] Unless otherwise specified, the component raw materials used in the examples and comparative examples of the present invention are all commercially available raw materials, and the component raw materials used in each parallel experiment are the same kind.

[0092] Examples 1 - 16 - Comparative Examples 1 - 7 The formulations of the polyolefin composites of Examples 1 - 16 and Comparative Examples 1 - 7 are shown in Tables 1 and 2 (in parts by weight in the tables).

[0093] Among them, the preparation methods of the polyolefin composites of Examples 1 - 16 and Comparative Examples 1 - 7 all include the following steps: According to the formulation, the 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 the phosphorus - nitrogen - based flame retardant and graphite are added from the side feeding ports of the 5th - 7th sections of the twin - screw extruder, and melt - extruded to obtain the polyolefin composite.

[0094] Table 1 Table 2 Performance testing 1. Electromagnetic shielding performance testing: The shielding effectiveness of planar materials is tested according to the standard GB / T 30142 - 2013.

[0095] 2. Flame - retardant performance testing: The flame - retardant performance is tested according to the standard GB / T 10707 using a vertical burning tester and an oxygen index meter.

[0096] Table 3 As can be seen from Table 3, the polyolefin composite described in the present invention has excellent electromagnetic shielding performance and flame - retardant performance. The polyolefin material is suitable for preparing electronic components, especially suitable for preparing electric control boxes, lithium - battery packs and electronic and electrical protection casings. Among them, the electromagnetic shielding effectiveness ≥ 32 DB, the 1.5 - mm UL - 94 vertical burning rating is V - 0, and the oxygen index ≥ 33%.

[0097] By comparing Example 1 with Comparative Examples 1 - 7, it can be seen that the vinyl coupling agent - modified metal powder, nitrogen - phosphorus - based flame retardant and graphite described in the present invention have a significant synergistic effect in improving the 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.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A polyolefin composite material, characterized in that, Comprising 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 - based flame retardant, 4.5 - 11 parts of graphite, 0.9 - 5.2 parts of interface improver; The vinyl coupling agent - modified metal powder comprises a vinyl coupling agent and a 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.

2. The polyolefin composite material according to claim 1, wherein The average particle size of the vinyl coupling agent - modified metal powder is 0.5 - 50 μm.

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

4. The polyolefin composite material according to claim 1, characterized in that, The vinyl coupling agent comprises at least one of vinyltris(2 - methoxyethoxy)silane, vinyltrimethoxysilane, and vinyltriethoxysilane.

5. The polyolefin composite material according to claim 1, characterized in that, The particle size of the graphite is 100 - 1000 mesh.

6. The polyolefin composite material according to claim 1, wherein The nitrogen - phosphorus - based flame retardant comprises 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, polyphosphazene piperazine, and piperazine hypophosphite; and / or The interface improver comprises at least one of maleic anhydride - grafted polypropylene, maleic anhydride - grafted polyethylene, acrylic - grafted polypropylene, and acrylic - grafted polyethylene.

7. The polyolefin composite material according to claim 1, characterized in that, It also includes 0 - 1 part by weight of antioxidant and 0 - 2 parts by weight of processing aid.

8. The preparation method of the polyolefin composite material according to any one of claims 1 to 7, characterized in that, Comprising the following steps: First, melt - blend the polyolefin resin, vinyl coupling agent - modified metal powder, and interface improver, and then mix and melt - extrude with other components to obtain a polyolefin composite material.

9. Use of the polyolefin composite material according to any one of claims 1 - 7 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.

10. An electronic component, characterized in that, Prepared by using the polyolefin composite material according to any one of claims 1 - 7.

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