Metal / nonmetal composite material and preparation method and application thereof

Abstract

The invention provides a metal / non-metal composite material and a preparation method and application thereof.The metal / non-metal composite material comprises a non-metal material base material, a metal hollow sphere and a binder, and the difference value of the density of the metal hollow sphere and the density of the non-metal material base material is smaller than or equal to 0.03 g / cm < 3 >; and the non-metal material base material and the metal hollow ball body are bonded into a whole through the binder. The metal / non-metal composite material disclosed by the invention is relatively good in performance consistency, relatively high in strength and light in weight; when the composite material is used as a raw material of automobile parts, the requirements of the automobile parts on the aspects of light weight, strength, durability and the like of materials can be met.

Description

Technical Field

[0001] The present application relates to the technical field of composite materials, and in particular to a metal / non-metal composite material and a preparation method and application thereof. Background Art

[0002] In recent years, with the rapid and stable development of the automobile industry, automobile lightweighting technology has become an important means to promote the sustainable development of the automobile industry, improve automobile economy, and reduce automobile emissions. Especially for new energy vehicles, reducing the weight of the vehicle has become an important means to increase the driving range.

[0003] Among the many lightweight solutions, plastics have the advantages of low density, good insulation, anti-buffering, corrosion resistance, abundant raw materials, and low prices. Replacing steel with plastics has become the most widely used and most weight-reducing implementation measure. However, due to the limitations of the material's own properties, non-metallic materials such as plastics have poor climate performance such as low hardness, low strength, poor rigidity, and high temperature resistance compared to metal materials, which makes it impossible to replace metal materials with non-metallic materials for some parts.

[0004] To solve such problems, there are already metal / non-metal composite parts in the industry. However, most of the current metal and non-metal composite materials are mechanically connected by bonding, riveting, welding and other methods, which have problems such as high cost, poor interface bonding, easy corrosion, easy deformation and cracking. The main reason is that non-metallic materials and metal materials have different ductility, shrinkage, and resistance to factors such as temperature, and thus react differently to environmental and force changes. For example, under high temperature and high humidity conditions, the plastic itself will expand due to heat absorption and moisture absorption, while metal materials will not. As a result, the plastic expansion process is restricted by the connection, causing internal stress in the entire component. Over time, it is easy to cause problems such as falling off, deformation, and cracking. As a result, water, dust and other substances will enter the connection to cause corrosion, exacerbating quality problems, incurring maintenance costs and component replacement costs, and increasing costs.

[0005] Therefore, the traditional technology still needs to be further improved. Summary of the invention

[0006] Based on this, the present application provides a metal / non-metal composite material with good performance consistency, high strength and light weight, and correspondingly provides a preparation method and application of the metal / non-metal composite material.

[0007] The technical solution proposed in this application is as follows:

[0008] According to a first aspect of the present application, a metal / non-metal composite material is provided, comprising a non-metallic material substrate, a metal hollow sphere and a binder, wherein the density difference between the metal hollow sphere and the non-metallic material substrate is less than or equal to 0.03 g / cm 3 The adhesive bonds the non-metallic material substrate and the metal hollow sphere together.

[0009] In any embodiment, the surface roughness Ra of the metal hollow sphere is 0.4 μm to 0.8 μm.

[0010] In any embodiment, the D50 particle size of the metal hollow sphere is 50 nm to 500 nm.

[0011] In any embodiment, the material of the metal hollow sphere includes aluminum, magnesium, steel and alloys thereof.

[0012] In any embodiment, the non-metallic material substrate includes one or more of general plastics, engineering plastics and special plastics.

[0013] In any embodiment, the non-metallic material substrate includes one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer, polyamide, polyoxymethylene, polybutylene terephthalate, polyphenylene sulfide and polyetheretherketone.

[0014] In any embodiment, the adhesive includes one or more of an epoxy adhesive, an acrylic adhesive, and a modified silane adhesive.

[0015] In any embodiment, based on the total mass of the non-metallic material substrate, the metal hollow spheres and the binder as 100%, the total mass of the metal hollow spheres and the binder in the metal / non-metallic composite material accounts for 5% to 70%.

[0016] In any embodiment, the metal / non-metal composite material further comprises one or more of an anti-aging agent, a masterbatch, a toughening agent and a flame retardant.

[0017] According to the second aspect of the present application, a method for preparing the metal / non-metal composite material of the first aspect of the present application is provided, comprising the following steps: mixing a non-metallic material substrate, a metal hollow sphere and a binder, and injection molding to form the metal / non-metal composite material; wherein the difference between the density of the metal hollow sphere and the density of the non-metallic material substrate is less than or equal to 0.03 g / cm 3 .

[0018] In any embodiment, the mixing of the non-metallic material substrate, the metal hollow sphere and the binder comprises the following steps: applying the binder on the surface of the metal hollow sphere to form a metal hollow sphere with a binder layer on the surface; mixing the metal hollow sphere with the binder layer on the surface with the non-metallic material substrate.

[0019] In any embodiment, the thickness of the adhesive layer is 0.08 μm to 0.1 μm.

[0020] In any embodiment, before applying the adhesive on the surface of the hollow metal sphere, the method further comprises the following steps: forming a concave-convex rough structure on the surface of the hollow metal sphere by laser etching.

[0021] According to the third aspect of the present application, there is provided an application of a metal / non-metal composite material prepared by the metal / non-metal composite material of the first aspect of the present application or the method for preparing the metal / non-metal composite material of the second aspect of the present application in the preparation of automotive parts.

[0022] According to the fourth aspect of the present application, a composite material product is provided, comprising the metal / non-metal composite material of the first aspect of the present application, or a metal / non-metal composite material prepared by the preparation method of the metal / non-metal composite material of the second aspect of the present application.

[0023] Compared with the traditional technology, this application has at least the following beneficial effects:

[0024] The above-mentioned metal / non-metal composite material is obtained by adding metal hollow spheres as reinforcing materials to the non-metallic material substrate. The density of the metal hollow spheres is equivalent to that of the non-metallic material substrate, and the non-metallic material substrate and the metal hollow spheres are bonded together by a binder; wherein the metal hollow spheres having a density equivalent to that of the non-metallic material substrate can be uniformly mixed with the non-metallic material substrate and uniformly distributed in the non-metallic material substrate to form a metal / non-metal composite material with good uniformity of performance. The metal / non-metal composite material is mainly composed of the non-metallic material substrate, and can achieve lightweight of the material; the use of metal hollow spheres as reinforcing materials can significantly improve the strength of the material, and is a metal / non-metal composite material with good consistency of performance, high strength and lightness. Using it as a raw material for automotive parts can meet the requirements of automotive parts for lightweight materials, strength and durability.

[0025] In addition, in the preparation method of the present application, a binder is first applied to the surface of the metal hollow sphere to form a binder layer, and then mixed with the non-metallic material substrate for injection molding; compared with the method of directly mixing the non-metallic material substrate, the metal hollow sphere and the binder, it is more conducive to improving the dispersion uniformity of the metal hollow sphere in the non-metallic material substrate, and improving the interface bonding force between the metal hollow sphere and the non-metallic material substrate, thereby further optimizing the performance consistency and mechanical properties of the metal / non-metallic composite material. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. Unless otherwise specifically stated, various raw materials, reagents, instruments and equipment used in the present application, etc. can be purchased from the market or can be prepared by existing methods.

[0028] Some embodiments of the present application provide a metal / non-metal composite material, the metal / non-metal composite material comprising a non-metal material substrate, a metal hollow sphere and a binder; wherein the difference between the density of the metal hollow sphere and the density of the non-metal material substrate is less than or equal to 0.03 g / cm 3 , the adhesive bonds the non-metallic material substrate and the metal hollow sphere into one.

[0029] The above-mentioned metal / non-metal composite material is obtained by adding metal hollow spheres as reinforcing materials into the non-metallic material matrix, and the density difference between the metal hollow spheres and the non-metallic material matrix is ​​less than or equal to 0.03g / cm 3 The densities of the two are close, and the non-metallic material substrate and the metal hollow spheres are bonded together by a binder; wherein the metal hollow spheres having a density close to that of the non-metallic material substrate can be uniformly mixed with the non-metallic material substrate and uniformly distributed in the non-metallic material substrate, and the binder can tightly bond the metal hollow spheres to the non-metallic material substrate during the molding (such as injection molding) process to form a metal / non-metallic composite material with good performance uniformity.

[0030] The metal / non-metal composite material is mainly composed of non-metallic material substrate, which can achieve material lightweight; the use of metal hollow spheres as reinforcement materials can significantly improve the strength of the material. It is a metal / non-metal composite material with good performance consistency, high strength and light weight. Using it as a raw material for automotive parts can meet the requirements of automotive parts for material lightweight, strength and durability.

[0031] It should be noted that the density difference between the metal hollow sphere and the non-metallic material substrate refers to the absolute value of the difference between the density of the metal hollow sphere and the density of the non-metallic material substrate.

[0032] In some embodiments, the outer surface of the metal hollow sphere has a rough structure, and the surface roughness Ra of the metal hollow sphere is 0.4 μm to 0.8 μm. By setting the outer surface of the metal hollow sphere to a rough surface and controlling its roughness within the above range, the contact area between the metal hollow sphere and the binder can be effectively increased, so that more binder can be attached to the surface of the metal hollow sphere, and the metal hollow sphere and the non-metallic material substrate are more closely bonded, which is conducive to further improving the strength and other mechanical properties of the metal / non-metallic composite material.

[0033] It should be noted that the above-mentioned rough structure can be formed on the outer surface of the metal hollow sphere by various existing methods. In some specific examples, the pattern formed by concave and convex can be etched on the outer surface of the metal hollow sphere by laser etching, thereby increasing the roughness and specific surface area of ​​the surface of the metal hollow sphere. In addition, the above-mentioned rough structure can also be formed on the surface of the metal hollow sphere by chemical corrosion, electrochemical treatment and other methods.

[0034] In addition, metal hollow spheres can be prepared by various existing methods. For example, metal hollow spheres can be prepared by a template method or a template-free method. Among them, the template method refers to the use of a pre-prepared template as a "mold" when preparing metal hollow spheres, depositing metal on the surface or inside the template, and then removing the template to obtain a hollow structure. The template can be a hard template, such as a silica sphere, etc.; it can also be a soft template, such as an emulsion droplet, etc. The template-free method is a method that uses physical or chemical processes to form a hollow structure of a metal material itself. The template-free method mainly includes spray drying, atomization, replacement reaction sintering, self-assembly, and chemical vapor deposition.

[0035] In some embodiments, the D50 particle size of the metal hollow sphere is 50 nm to 500 nm. Controlling the D50 particle size of the metal hollow sphere within the above range can make the size of the metal hollow sphere more compatible with the chain length of the non-metallic material substrate (such as plastic), which is conducive to further improving the mixing uniformity between the metal hollow sphere and the non-metallic material substrate.

[0036] It can be understood that the D50 particle size of the metal hollow sphere can be 50nm, 60nm, 80nm, 100nm, 120nm, 150nm, 180nm, 200nm, 220nm, 250nm, 280nm, 300nm, 320nm, 350nm, 380nm, 400nm, 420nm, 450nm, 480nm, 500nm and any value within the range formed by any two of the above values.

[0037] In some embodiments, the material of the metal hollow sphere includes aluminum, magnesium, steel and alloys thereof. That is, the metal hollow sphere can be a magnesium hollow sphere, an aluminum hollow sphere, a steel hollow sphere, an alloy hollow sphere, etc. The specific material of the metal hollow sphere can be selected according to the application scenario and actual performance requirements of the metal / non-metal composite material.

[0038] In some of the embodiments, the non-metallic material substrate is plastic. Specifically, it can be one or more of general plastics, engineering plastics and special plastics. In some specific examples, the non-metallic material substrate is one or more of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), polyamide (PA), polyoxymethylene (POM), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS) and polyetheretherketone (PEEK). It can be understood that the specific type of non-metallic material substrate can be selected according to the application scenario and actual performance requirements of the metal / non-metallic composite material.

[0039] In some embodiments, the adhesive includes one or more of an epoxy adhesive, an acrylic adhesive, and a modified silane adhesive. The above adhesive has good bonding properties with both the non-metallic material substrate and the metal hollow sphere, which is conducive to a tighter combination between the non-metallic material substrate and the metal hollow sphere, and further improves the mechanical properties of the metal / non-metal composite material.

[0040] Among them, epoxy adhesives include but are not limited to bisphenol A epoxy resin adhesives, phenolic epoxy resin adhesives, aliphatic epoxy resin adhesives, glycidyl ester epoxy resin adhesives and water-based epoxy adhesives; acrylic adhesives include but are not limited to solvent-based acrylic adhesives, emulsion-based acrylic adhesives and reactive acrylic adhesives; modified silane adhesives include but are not limited to single-component modified silane adhesives, two-component modified silane adhesives, epoxy-modified silane adhesives, polyurethane-modified silane adhesives and acrylic-modified silane adhesives.

[0041] In some of the embodiments, the total mass of the non-metallic material substrate, the metal hollow sphere and the binder is 100%, and the total mass of the metal hollow sphere and the binder in the metal / non-metallic composite material accounts for 5% to 70%. Controlling the total mass proportion of the metal hollow sphere and the binder in the metal / non-metallic composite material within the above range is conducive to making the metal / non-metallic composite material better balance performance consistency, strength and lightweight. It is understandable that the total mass proportion of the metal hollow sphere and the binder can be 5%, 10%, 15%, 18%, 20%, 25%, 28%, 30%, 35%, 38%, 40%, 45%, 48%, 50%, 55%, 58%, 60%, 65%, 68%, 70% and any value within the range formed by any two of the above values.

[0042] In some embodiments, the metal / non-metal composite material further includes one or more of an anti-aging agent, a color masterbatch, a toughening agent, and a flame retardant. It is understandable that one or more of the above raw materials can be selectively added to the metal / non-metal composite material according to the performance requirements of the metal / non-metal composite material.

[0043] For example, when the metal / non-metal composite material is required to have better aging performance, a certain amount of anti-aging additive can be added to the metal / non-metal composite material; when the metal / non-metal composite material is required to have a specific color, a specific masterbatch can be added to the composite material; when the metal / non-metal composite material is required to have a specific toughness or flame retardant performance, a certain amount of toughening agent or flame retardant can be added to the composite material respectively.

[0044] In one embodiment of the present application, a method for preparing a metal / non-metal composite material is provided, the method comprising the following steps: mixing a non-metallic material substrate, a metal hollow sphere and a binder, and performing injection molding to form a metal / non-metal composite material; wherein the difference between the density of the metal hollow sphere and the density of the non-metallic material substrate is less than or equal to 0.03 g / cm 3 .

[0045] The preparation method of the above-mentioned metal / non-metal composite material adopts a non-metal material substrate and a metal hollow sphere with equivalent density, mixes them with a binder, and prepares the metal / non-metal composite material through injection molding. The non-metal material substrate and the metal hollow sphere with equivalent density can be uniformly mixed with each other, and the metal hollow sphere can be uniformly distributed in the non-metal material substrate to form a metal / non-metal composite material with good performance uniformity, high strength and light weight. The metal / non-metal composite material prepared by this preparation method can meet the requirements of automotive parts for material lightness, strength and durability.

[0046] In some of the embodiments, mixing the non-metallic material substrate, the metal hollow sphere and the binder comprises the following steps: first, applying the binder on the surface of the metal hollow sphere to form the metal hollow sphere having the binder layer on the surface; and then mixing the metal hollow sphere having the binder layer on the surface with the non-metallic material substrate.

[0047] In this way, a binder is first applied on the surface of the metal hollow sphere to form a binder layer, and then mixed with the non-metallic material substrate for injection molding. Compared with the method of directly mixing the non-metallic material substrate, the metal hollow sphere and the binder, it is more conducive to improving the dispersion uniformity of the metal hollow sphere in the non-metallic material substrate and improving the interface bonding strength between the metal hollow sphere and the non-metallic material substrate.

[0048] In some embodiments, the thickness of the adhesive layer is 0.08 μm to 0.1 μm. It is understood that the thickness of the adhesive layer can be 0.08 μm, 0.085 μm, 0.09 μm, 0.095 μm, 0.1 μm, and any value within the range formed by any two of the above values.

[0049] In some embodiments, before applying the binder on the surface of the hollow metal sphere, a concavo-convex rough structure is formed on the surface of the hollow metal sphere by laser etching. In this way, a patterned concavo-convex rough structure can be formed on the surface of the hollow metal sphere, increasing the surface roughness and specific surface area of ​​the hollow metal sphere, thereby being more conducive to the adhesion of the binder on the surface of the hollow metal sphere and increasing the adhesion amount of the binder.

[0050] It should be noted that, in addition to forming the concavo-convex rough structure on the surface of the metal hollow sphere by laser etching, the above-mentioned rough structure can also be formed on the surface of the metal hollow sphere by existing methods such as chemical corrosion and electrochemical treatment.

[0051] The metal / non-metal composite material of the present application or the metal / non-metal composite material prepared by the preparation method of the present application has good performance uniformity, high strength, and is lightweight. It can be used as raw materials for automotive parts and made into various automotive parts, which can meet the requirements of automotive parts for material lightweight, strength, and durability.

[0052] The present application will be further described below in conjunction with specific embodiments and comparative examples, but they should not be construed as limiting the scope of protection of the present application.

[0053] Embodiment 1:

[0054] Laser etching was used to etch a patterned concave-convex rough structure on the surface of a magnesium-zinc alloy hollow sphere with a D50 particle size of 100 nm, so that the surface roughness Ra of the magnesium-zinc alloy hollow sphere was 0.5 μm. The magnesium-zinc alloy hollow sphere was mixed with an epoxy adhesive, and a 0.1 μm thick adhesive layer was attached to the surface of the magnesium-zinc alloy hollow sphere.

[0055] 100g of the above-prepared magnesium-zinc alloy hollow sphere with a binder layer on the surface was mixed with 100g of PP material, 0.6g of anti-aging agent 1010, 1.5g of masterbatch, 2g of flame retardant aluminum hydroxide, and 6g of toughening agent PS512 to form an injection molding base material. The injection molding base material was placed in an injection molding machine and heated at 8cm 3 / s flow rate and 1100 bar pressure for 3s to obtain automobile parts. The density of the magnesium-zinc alloy hollow sphere is 0.92g / cm 3 , the density of PP material is 0.9g / cm 3 The density difference between the two is 0.02g / cm 3 The sum of the mass of the magnesium-zinc alloy hollow sphere and the binder accounts for 50% of the total mass of the magnesium-zinc alloy hollow sphere, the binder and the PP material.

[0056] Embodiment 2:

[0057] Laser etching was used to etch a patterned concave-convex rough structure on the surface of an aluminum-manganese alloy hollow sphere with a D50 particle size of 200 nm, so that the surface roughness Ra of the aluminum-manganese alloy hollow sphere was 0.7 μm. The aluminum-manganese alloy hollow sphere was mixed with an acrylic adhesive, and a binder layer with a thickness of 0.08 μm was attached to the surface of the aluminum-manganese alloy hollow sphere.

[0058] 50g of the aluminum-manganese alloy hollow sphere with a binder layer on the surface prepared above was mixed with 100g of PA66 material, 0.70g of hindered phenol and phosphite anti-aging additives, 1.0g of masterbatch, 7.5g of flame retardant melamine urate, and 7.5g of toughening agent TPU to form an injection molding base material. The injection molding base material was placed in an injection molding machine and heated at 6 cm 3 / s flow rate and 1200 bar pressure for 4s to obtain automobile parts. The density of the aluminum-manganese alloy hollow sphere is 1.11g / cm 3 The density of PA66 material is 1.12g / cm 3 The density difference between the two is 0.01g / cm 3 The sum of the mass of the aluminum-manganese alloy hollow sphere and the binder accounts for 33% of the total mass of the aluminum-manganese alloy hollow sphere, the binder and the PA66 material.

[0059] Embodiment 3:

[0060] Laser etching was used to etch a patterned concave-convex rough structure on the surface of a steel hollow sphere with a D50 particle size of 300 nm, so that the surface roughness Ra of the steel hollow sphere was 0.4. The steel hollow sphere was mixed with a modified silane adhesive, and a binder layer with a thickness of 0.09 μm was attached to the surface of the steel hollow sphere.

[0061] 50g of the steel hollow sphere with the adhesive layer on the surface prepared above was mixed with 200g of PE material, 1.2g of anti-aging agent 1024, 1.8g of masterbatch, 5g of flame retardant zinc borate, and 20g of toughening agent EPDM to form an injection molding base material. The injection molding base material was placed in an injection molding machine and heated at 9 cm 3 / s flow rate and 800 bar pressure for 3s to obtain automobile parts. The density of the hollow steel sphere is 0.96 g / cm 3 , the density of PE material is 0.94g / cm 3 The density difference between the two is 0.02g / cm 3 The sum of the mass of the hollow steel sphere and the binder accounts for 20% of the total mass of the hollow steel sphere, the binder and the PE material.

[0062] Comparative Example 1:

[0063] This embodiment is basically the same as the embodiment 1, except that a solid sphere of magnesium-zinc alloy is used instead of a hollow sphere of magnesium-zinc alloy; the density of the solid sphere of magnesium-zinc alloy is 1.9 g / cm 3 , the density of PP material is 0.9g / cm 3 The density difference between the two is 1g / cm 3 .

[0064] Test method:

[0065] (1) Performance consistency test method

[0066] The uniformity of the sample was checked using an electron scanning electron microscope. The sample was cut perpendicular to the injection direction at the thickest position, and the electron scanning electron microscope was magnified 400 times to observe the cross section.

[0067] (2) Tensile strength test method

[0068] The tensile strength test was carried out in accordance with GB / T 1040.2, using type 1A specimens at a test speed of 50 mm / min.

[0069] The performance test results of the products of the above embodiments and comparative examples are shown in Table 1.

[0070] Table 1

[0071]

[0072] It can be seen from Table 1 that the metal / non-metal composite materials of each embodiment of the present application have good consistency and high strength, and the density of the composite materials is close to the density of the non-metallic material substrate, which is conducive to achieving lightweight automotive parts.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A metal / non-metal composite material, characterized in that: The invention comprises a non-metallic material substrate, a metal hollow sphere and a binder, wherein the density difference between the metal hollow sphere and the non-metallic material substrate is less than or equal to 0.03 g / cm 3 The adhesive bonds the non-metallic material substrate and the metal hollow sphere together.

2. The metal / non-metal composite material according to claim 1, characterized in that: The surface roughness Ra of the metal hollow sphere is 0.4 μm-0.8 μm.

3. The metal / non-metal composite material according to claim 1, characterized in that: The D50 particle size of the metal hollow sphere is 50nm~500nm.

4. The metal / non-metal composite material according to any one of claims 1 to 3, characterized in that: The material of the metal hollow sphere includes aluminum, magnesium, steel and alloys thereof.

5. The metal / non-metal composite material according to any one of claims 1 to 3, characterized in that: The non-metallic material substrate includes one or more of general plastics, engineering plastics and special plastics.

6. The metal / non-metal composite material according to any one of claims 1 to 3, characterized in that: The non-metallic material substrate includes one or more of polyethylene, polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer, polyamide, polyoxymethylene, polybutylene terephthalate, polyphenylene sulfide and polyetheretherketone.

7. The metal / non-metal composite material according to any one of claims 1 to 3, characterized in that: The adhesive includes one or more of an epoxy adhesive, an acrylic adhesive and a modified silane adhesive.

8. The metal / non-metal composite material according to any one of claims 1 to 3, characterized in that: Taking the total mass of the non-metallic material substrate, the metal hollow spheres and the binder as 100%, the total mass of the metal hollow spheres and the binder in the metal / non-metallic composite material accounts for 5% to 70%.

9. The metal / non-metal composite material according to any one of claims 1 to 3, characterized in that: The metal / non-metal composite material further comprises one or more of an anti-aging aid, a color masterbatch, a toughening agent and a flame retardant.

10. A method for preparing a metal / non-metal composite material, characterized in that: The following steps are involved: The non-metallic material substrate, the metal hollow sphere and the binder are mixed and injection molded to form the metal / non-metallic composite material; wherein the difference between the density of the metal hollow sphere and the density of the non-metallic material substrate is less than or equal to 0.03 g / cm 3 .

11. The method for preparing the metal / non-metal composite material according to claim 10, characterized in that: The mixing of the non-metallic material substrate, the metal hollow spheres and the binder comprises the following steps: Applying the binder on the surface of the metal hollow sphere to form a metal hollow sphere having a binder layer on the surface; The metal hollow spheres having a binder layer on the surface are mixed with the non-metallic material substrate.

12. The method for preparing the metal / non-metal composite material according to claim 11, characterized in that: The thickness of the adhesive layer is 0.08 μm to 0.1 μm.

13. The method for preparing the metal / non-metal composite material according to claim 11 or 12, characterized in that: Before applying the binder on the surface of the metal hollow sphere, the following steps are also included: A concavo-convex rough structure is formed on the surface of the metal hollow sphere by laser etching.

14. Use of the metal / non-metal composite material according to any one of claims 1 to 9 or the metal / non-metal composite material prepared by the method for preparing the metal / non-metal composite material according to any one of claims 10 to 13 in the preparation of automobile parts.

15. A composite material product, characterized in that: A metal / non-metal composite material comprising the metal / non-metal composite material according to any one of claims 1 to 9, or a metal / non-metal composite material prepared by the method for preparing the metal / non-metal composite material according to any one of claims 10 to 13.

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