CN106003850B - Honeycomb sandwich structural part and preparation method thereof - Google Patents

Abstract

The invention discloses a honeycomb sandwich structural member and a preparation method thereof. The method comprises the following steps: s1, selecting a honeycomb core and filling foam to form a foam honeycomb core; s2, selecting two non-woven fabric layers and two hot melt adhesive film layers, sequentially placing the non-woven fabric layers, the hot melt adhesive film layers, the foam honeycomb core, the hot melt adhesive film layers and the non-woven fabric layers in a first mold, and adjusting the temperature and the pressure to perform hot-pressing combination to obtain an intermediate core; s3, placing the middle core between two fiber reinforced thermoplastic panels, placing the two fiber reinforced thermoplastic panels in a second mold, adjusting the temperature and the pressure to perform hot-pressing combination, and rapidly cooling after the hot pressing is finished to obtain the honeycomb sandwich middle plate; s4, injection molding and edge covering are carried out on the periphery of the honeycomb sandwich intermediate plate, and the honeycomb sandwich structural member is obtained. The honeycomb sandwich structural member prepared by the method has strong mechanical property, is not easy to degum and delaminate and has long service life.

Description

Honeycomb sandwich structure and its preparation method

technical field

The invention relates to the technical field of honeycomb sandwich panels, in particular to a honeycomb sandwich structure and a preparation method thereof.

Background technique

The composite sandwich structure is generally composed of three layers of materials. The upper and lower layers are panels or skins of high-strength, high-modulus materials. Or the skin keeps a certain distance, thereby increasing the moment of inertia of the section, which not only improves the bending stiffness of the structure, but also makes full use of the strength of the material. Using the honeycomb core as the core can produce a high-performance, lightweight laminate, called a honeycomb sandwich structure.

The mechanical properties of the existing honeycomb sandwich structure are not ideal. For example, the thermosetting skin honeycomb sandwich structure has problems such as poor toughness and poor impact resistance, which affect its application range. In addition, because the bonding area between the skin and the honeycomb core is very small, it is difficult to ensure the necessary bonding between the skin and the honeycomb core, and degumming and delamination are very easy to occur, which directly affects the performance and service life of the product.

Contents of the invention

Based on this, the present invention provides a method for preparing a honeycomb sandwich structure. The prepared honeycomb sandwich structure has strong mechanical properties, is not easy to be degummed and delaminated, and has a long service life.

The invention also provides a honeycomb sandwich structure.

In order to realize the purpose of the present invention, the present invention adopts following technical scheme:

A preparation method for a honeycomb sandwich structure, comprising the steps of:

S1, selecting a honeycomb core, filling foam in the pores of the honeycomb core to form a foam honeycomb core;

S2, select the first non-woven fabric layer, the second non-woven fabric layer, the first hot-melt adhesive film layer, the second hot-melt adhesive film layer and provide the first mold, then heat the first mold to be larger than the first hot-melt adhesive The melting point temperature of the film layer and the second hot-melt adhesive film layer is 1°C-100°C, and the first non-woven fabric layer, the first hot-melt adhesive film layer, the foam honeycomb core, the second hot-melt adhesive film layer and the second Place the non-woven fabric layer in the first mold, close the mold, adjust the pressure of the first mold to 0.1MPa-1MPa, keep the heat and pressure for 3s-120s, so that the first non-woven fabric layer, the first hot-melt adhesive film layer, the foam The honeycomb core, the second hot-melt adhesive film layer and the second non-woven fabric layer are combined by heat and pressure, and the intermediate core is obtained after demoulding;

S3. Select a fiber-reinforced thermoplastic panel and provide a second mold, heat the second mold to the molding temperature of the fiber-reinforced thermoplastic panel, place the intermediate core between two fiber-reinforced thermoplastic panels, and place it in the second mold In the process of closing the mold, adjust the pressure of the second mold to 0.2MPa-5MPa, and keep the heat and pressure for 15s-150s, so that the fiber-reinforced thermoplastic panel and the middle core are hot-compressed together, and they are demoulded after rapid cooling within 30s-90s to obtain Honeycomb sandwich panel;

S4. Embedding the honeycomb sandwich middle plate into the injection mold, injecting the honeycomb sandwich middle plate, forming hemming on the periphery of the honeycomb sandwich middle plate, and obtaining the honeycomb sandwich structure.

In some of the embodiments, between the step S3 and the step S4, there is also a step S31: removing the burrs on the periphery of the honeycomb sandwich middle plate.

In some of these embodiments, the honeycomb core in the step S1 is one of PE honeycomb core, PP honeycomb core, PVC honeycomb core, PC honeycomb core, PET honeycomb core, paper honeycomb core, Nomex honeycomb core and aluminum honeycomb core , the thickness is 3mm-30mm.

In some of these embodiments, the foam in the step S1 is one or a combination of PVC foam, PS foam, PU foam, PUR foam, PEI foam, PI foam, PMI foam, PPSU foam and SAN foam, The foam has a density of 40-200 kg/m ³ .

In some of these embodiments, in the step S2, the first non-woven layer and the second non-woven layer are all selected from polypropylene, polyester, nylon, acrylic, polyethylene, and polyvinyl chloride, and the square grammage is 10g/m ² -100g/m ² .

In some of these embodiments, the first hot-melt adhesive film layer and the second hot-melt adhesive film layer in the step S2 use the same kind of hot-melt adhesive film layer, and are selected from PO hot-melt adhesive film, TPU hot-melt adhesive film Film, PA hot-melt adhesive film, EVA hot-melt adhesive film and PES hot-melt adhesive film, with a thickness of 0.05mm-0.3mm.

In some of these embodiments, the thickness of the fiber-reinforced thermoplastic panel in the step S3 is 0.2mm-3mm, the volume content of fibers is 35%-65%, and the fiber-reinforced thermoplastic panel is composed of a resin matrix and a reinforcing phase, so The above resin matrix is HDPE, LDPE, PP, PE, PC, PC/ABS alloy, PA, TPU, PA6, PA66, PA11, PA12, PPS, PEK, PEEK, PI, PEI, PMMA, PLA, POM, PET and PBT The reinforcing phase is continuous glass fiber, carbon fiber, aramid fiber, basalt fiber, PBO fiber, UHMWPE fiber, PET fiber, alumina fiber, silicon carbide fiber woven cloth, unidirectional cloth, woven cloth and single One or more of mixed cloth to cloth.

In some of these embodiments, the plastic used for injection molding in the step S4 is glass fiber or carbon fiber reinforced plastic, the weight content of the fiber is 5%-65%, and the plastic matrix in the glass fiber or carbon fiber reinforced plastic is HDPE, LDPE , PP, PE, PC, PC/ABS alloy, PA, TPU, PA6, PA66, PA11, PA12, PPS, PEK, PEEK, PI, PEI, PMMA, PLA, POM, PET and PBT.

The present invention also adopts following technical scheme:

A honeycomb sandwich structure, made by the above method, comprising a honeycomb sandwich middle plate and a wrapping covering the periphery of the honeycomb sandwich middle plate, the honeycomb sandwich middle plate includes sequentially bonded and connected The first fiber-reinforced thermoplastic panel, the first non-woven fabric layer, the first hot-melt adhesive film layer, the foam honeycomb core, the second hot-melt adhesive film layer, the second non-woven fabric layer and the second fiber-reinforced thermoplastic panel, so The foam honeycomb core is composed of a honeycomb core and foam filled in the pores of the honeycomb core.

In some of these embodiments, the thicknesses of the first fiber-reinforced thermoplastic panel and the second fiber-reinforced thermoplastic panel are both 0.2mm-3mm, and the thicknesses of the first hot-melt adhesive film layer and the second hot-melt adhesive film layer are Both are 0.05mm-0.3mm, and the thickness of the honeycomb core is 3mm-30mm.

The preparation method of the honeycomb sandwich structural part of the present invention first fills the honeycomb core with foam to form a foam honeycomb core, which strengthens the mechanical properties such as toughness and impact resistance of the honeycomb core; then the first non-woven fabric layer, the second A hot-melt adhesive film layer, a foam honeycomb core, a second hot-melt adhesive film layer and a second non-woven fabric layer are placed in the first mold for hot-press bonding to form an intermediate core, and then the intermediate core is placed on two fibers Reinforced thermoplastic panels are hot-pressed and laminated through the second mold, and then injection-molded; there is a non-woven fabric layer between the fiber-reinforced thermoplastic panels and the foam honeycomb core. The mechanical properties of the entire structural part are improved; and the fiber-reinforced thermoplastic panel and the foam honeycomb core are bonded through a non-woven layer, which increases the bonding area of the two, and the injection molding reinforcement strengthens the stability of the structural part. The means of rapid heating and rapid cooling is adopted in the hot pressing of the second mold, and the rapid cooling after the hot pressing is stable makes the bonding stability higher, thus making the structural part less prone to degumming and delamination, and improving its service life.

Description of drawings

Fig. 1 is a partial sectional view of a honeycomb sandwich structure according to a preferred embodiment of the present invention.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

The preparation method of honeycomb sandwich structure of the present invention, it comprises the steps:

S1. A honeycomb core is selected. The honeycomb core has a plurality of holes, and the pores of the honeycomb core are filled with foam to form a foam honeycomb core. In this embodiment, the thickness of the honeycomb core is 3mm-30mm, and the thickness is determined according to the required thickness of the overall structural member. The material of the honeycomb core is one of PE honeycomb core, PP honeycomb core, PVC honeycomb core, PC honeycomb core, PET honeycomb core, paper honeycomb core, Nomex honeycomb core and aluminum honeycomb core. The foam is one or a combination of PVC foam, PS foam, PU foam, PUR foam, PEI foam, PI foam, PMI foam, PPSU foam and SAN foam, and the density of the foam is 40-200kg/m ³ . When several materials are selected for the foam, different types of foam can be filled in one hole, or one kind of foam can be filled in the same hole, and other foams of different types can be filled in other holes.

S2, select the first non-woven fabric layer, the second non-woven fabric layer, the first hot-melt adhesive film layer, the second hot-melt adhesive film layer and provide the first mould, the first non-woven fabric layer, the second non-woven fabric layer The cloth layer is cut to the same size as the first hot-melt adhesive film layer, the second hot-melt adhesive film layer and the foam honeycomb core to ensure that the circumference of the manufactured structural parts is neat, and then the first mold is heated to a thickness larger than the hot-melt adhesive film. The melting point temperature is 1°C-100°C, generally 80°C-180°C. For example, the melting point of PES is 135°C, and it is heated to 145°C during hot pressing. Place the first non-woven fabric layer, the first hot-melt adhesive film layer, the foam honeycomb core, the second hot-melt adhesive film layer and the second non-woven fabric layer in the first mold in sequence, arrange until the layers are aligned, and close the mold , the hot pressing temperature is 80°C-180°C, the pressure of the first mold is adjusted to 0.1MPa-1MPa, and the heat preservation and pressure are kept for 3s-120s, so that the first non-woven fabric layer, the first hot-melt adhesive film layer, the foam honeycomb core, The second hot-melt adhesive film layer and the second non-woven fabric layer are bonded by heat and pressure, and the intermediate core is obtained after demoulding. Wherein different hot-melt adhesive films have different melting point temperatures, the temperature of the mold is set according to the melting point temperature of the hot-melt adhesive film, wherein the first hot-melt adhesive film layer and the second hot-melt adhesive film layer need to use the same hot-melt adhesive film, in order to set the temperature of the first mold more conveniently, and prevent the melting point temperature of the first hot melt adhesive film layer and the second hot melt adhesive film layer from being different, which will affect the process of hot-press bonding. Both the first hot-melt adhesive film layer and the second hot-melt adhesive film layer are selected from PO hot-melt adhesive film, TPU hot-melt adhesive film, PA hot-melt adhesive film, EVA hot-melt adhesive film and PES hot-melt adhesive film. species, and the thickness of the first hot-melt adhesive film layer and the second hot-melt adhesive film layer is 0.05mm-0.3mm. Both the first non-woven fabric layer and the second non-woven fabric layer are selected from polypropylene fiber, polyester fiber, nylon fiber, acrylic fiber, polyethylene fiber and polyvinyl chloride, and the square grammage is 10g/m ² -100g/m ² . The first non-woven fabric layer and the second non-woven fabric layer can be selected from the same or different types.

S3. Select a fiber-reinforced thermoplastic panel and provide a second mold, heat the second mold to the molding temperature of the fiber-reinforced thermoplastic panel, the temperature is 150°C-400°C, for example, the molding temperature of the fiber-reinforced TPU panel is 180°C. Place the middle core between the same two fiber-reinforced thermoplastic panels, and place it in the second mold, close the mold, adjust the pressure of the second mold to 0.2MPa-5MPa, keep the heat and pressure for 15s-150s, so that the fiber-reinforced thermoplastic The panel and the middle core are hot-pressed together, cooled rapidly within 30s-90s and demolded to obtain the honeycomb sandwich middle board. Fiber-reinforced thermoplastic panels are composed of a resin matrix and a reinforcement phase. Different types of fiber-reinforced thermoplastic panels have different molding temperatures. For example, if the resin matrix is selected, the molding temperatures of glass fiber-reinforced and carbon-fiber-reinforced panels are different. In this embodiment, the thickness of the fiber-reinforced thermoplastic panel is 0.2mm-3mm, and the volume content of fibers is 35%-65%, that is, the volume ratio of the reinforcing phase in the resin matrix and the reinforcing phase is 35%-65%. The resin matrix is selected from HDPE, LDPE, PP, PE, PC, PC/ABS alloy, PA, TPU, PA6, PA66, PA11, PA12, PPS, PEK, PEEK, PI, PEI, PMMA, PLA, POM, PET and PBT The reinforcing phase is made of continuous glass fiber, carbon fiber, aramid fiber, basalt fiber, PBO fiber, UHMWPE fiber, PET fiber, alumina fiber, silicon carbide fiber woven cloth, unidirectional cloth, woven cloth and unidirectional cloth One or more of the mixed cloth, when multiple reinforcement phases are selected, is a fiber-reinforced thermoplastic panel reinforced with multiple fibers.

S31. Remove flashings around the middle plate of the honeycomb sandwich to make the surface smooth and more convenient for injection molding.

S4. Embedding the honeycomb sandwich middle plate into an injection mold, injecting the honeycomb sandwich middle plate, forming hemming around the periphery of the honeycomb sandwich middle plate, and obtaining a honeycomb sandwich structure. Among them, the plastic used for injection molding is glass fiber or carbon fiber reinforced plastic, and the weight content of fiber is 5%-65%. The plastic matrix in glass fiber or carbon fiber reinforced plastic is HDPE, LDPE, PP, PE, PC, PC/ABS alloy, PA , TPU, PA6, PA66, PA11, PA12, PPS, PEK, PEEK, PI, PEI, PMMA, PLA, POM, PET and PBT.

Please refer to Fig. 1, the honeycomb sandwich structure 100 prepared by the preparation method of the above-mentioned honeycomb sandwich structure includes a honeycomb sandwich middle plate 10 and an edge 20 wrapped around the periphery of the honeycomb sandwich middle plate, the honeycomb sandwich The middle panel 10 includes a first fiber-reinforced thermoplastic panel 11, a first non-woven fabric layer 12, a first hot-melt adhesive film layer 13, a foam honeycomb core 14, a second hot-melt adhesive film layer 15, a second The non-woven fabric layer 16 and the second fiber-reinforced thermoplastic panel 17, the foam honeycomb core 14 is composed of a honeycomb core 141 and foam filled in the cells of the honeycomb core. The thicknesses of the first fiber reinforced thermoplastic panel 11 and the second fiber reinforced thermoplastic panel 17 are both 0.2mm-3mm, and the thicknesses of the first hot melt adhesive film layer 13 and the second hot melt adhesive film layer 15 are both 0.05mm-0.3 mm. mm, the thickness of the honeycomb core is 3mm-30mm.

In the present invention, foam is first filled in the honeycomb core to form a foam honeycomb core, which strengthens the mechanical properties of the honeycomb core such as toughness and impact resistance; then the first non-woven fabric layer, the first hot-melt adhesive film layer, the foam honeycomb core, The second hot-melt adhesive film layer and the second non-woven fabric layer are placed in the first mold for thermal compression bonding to form the middle core, and then the middle core is placed between two fiber-reinforced thermoplastic panels and passed through the second mold Carry out hot pressing lamination, and then carry out injection molding wrapping; there is a non-woven fabric layer between the fiber-reinforced thermoplastic panel and the foam honeycomb core. Due to the good toughness of the non-woven fabric itself, the mechanical properties of the entire structural part are enhanced; and the fiber-reinforced The thermoplastic panel and the foam honeycomb core are bonded through a non-woven fabric layer, which increases the bonding area of the two, and the injection molding edging strengthens the stability of the structural part. The second mold is hot-pressed by means of rapid heating and rapid cooling , cooling rapidly after the hot pressing is stable, which makes the bonding more stable, thus making the structural part less likely to be degummed and delaminated, and improving its service life.

Example

In this embodiment, the preparation method of the honeycomb sandwich structure comprises the following steps:

S1. A honeycomb core is selected. The honeycomb core has a plurality of holes, and the pores of the honeycomb core are filled with foam to form a foam honeycomb core. In this embodiment, the thickness of the honeycomb core is 6 mm. The material of the honeycomb core is a PC honeycomb core, which is filled with PVC foam to obtain a foam honeycomb core.

S2, select the first non-woven fabric layer, the second non-woven fabric layer, the first hot-melt adhesive film layer, and the second hot-melt adhesive film layer, and provide the first mold, the first non-woven fabric layer, the second non-woven fabric layer The woven fabric layer and the first hot-melt adhesive film layer, the second hot-melt adhesive film layer and the foam honeycomb core are cut to the same size to ensure that the circumference of the manufactured structural parts is neat, and the first hot-melt adhesive film layer and the second hot-melt adhesive film layer are Melt adhesive film layer is the TPU hot-melt adhesive film layer of 0.05mm, and the first non-woven fabric layer and the second non-woven fabric layer are PET non-woven fabric layers, and the specification is 30g/m ² ; Then heat the first mold to Greater than the melting point temperature of the first hot-melt adhesive film layer and the second hot-melt adhesive film layer is 120°C, and the first non-woven fabric layer, the first hot-melt adhesive film layer, the foam honeycomb core, and the second hot-melt adhesive film layer are sequentially And the second non-woven fabric layer is placed in the first mold, arranged until each layer is aligned, the mold is closed and hot-pressed, the pressure of the first mold is adjusted to 0.5MPa, and the heat preservation and pressure are maintained for 60s, so that the first non-woven fabric layer, the first The hot-melt adhesive film layer, the foam honeycomb core, the second hot-melt adhesive film layer and the second non-woven fabric layer are combined by heat and pressure, and the intermediate core is obtained after demoulding.

S3. Select a fiber-reinforced thermoplastic panel and provide a second mold. The fiber-reinforced thermoplastic panel is a composite thermoplastic panel of TPU and glass fiber, that is, a glass fiber-reinforced TPU panel with a fiber volume content of 45% and a thickness of 0.5mm. The second mold is at 170°C, place the middle core between the same two fiber-reinforced thermoplastic panels, and place it in the second mold, close the mold, adjust the pressure of the second mold to 1.5MPa, keep the heat and pressure for 30s, so that the fiber The reinforced thermoplastic panel and the middle core are hot-pressed together, cooled rapidly within 30s and demolded to obtain the honeycomb sandwich middle board. Fiber-reinforced thermoplastic panels are composed of a resin matrix and a reinforcement phase. Different types of fiber-reinforced thermoplastic panels have different molding temperatures. For example, if the resin matrix is selected, the molding temperatures of glass fiber-reinforced and carbon-fiber-reinforced panels are different.

S31. Remove flashings around the middle plate of the honeycomb sandwich to make the surface smooth and more convenient for injection molding.

S4. Embed the honeycomb sandwich panel into the injection mold, inject the honeycomb sandwich panel with glass fiber TPU with a weight content of 20%, the injection pressure is 500N, the injection temperature is 190°C, and the temperature of the injection mold is 80°C , The injection time is 4s. A wrapping is formed on the periphery of the honeycomb sandwich middle plate to obtain a honeycomb sandwich structure.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (8)

1. a preparation method of honeycomb sandwich structure, is characterized in that, comprises the steps: S1, selecting a honeycomb core, filling foam in the pores of the honeycomb core to form a foam honeycomb core; S2. Select the first non-woven fabric layer, the second non-woven fabric layer, the first hot-melt adhesive film layer, and the second hot-melt adhesive film layer, and provide the first mold, and then heat the first mold to a temperature larger than the first hot-melt adhesive film layer. The melting point temperature of the adhesive film layer and the second hot-melt adhesive film layer is 1°C-100°C, and the first non-woven fabric layer, the first hot-melt adhesive film layer, the foam honeycomb core, the second hot-melt adhesive film layer and the second The second non-woven fabric layer is placed in the first mold, the mold is closed, the pressure of the first mold is adjusted to 0.1MPa-1MPa, and the heat preservation and pressure are maintained for 3s-120s, so that the first non-woven fabric layer, the first hot-melt adhesive film layer, The foam honeycomb core, the second hot-melt adhesive film layer and the second non-woven fabric layer are combined by heat and pressure, and the intermediate core is obtained after demoulding; S3. Select a fiber-reinforced thermoplastic panel and provide a second mold, heat the second mold to the molding temperature of the fiber-reinforced thermoplastic panel, place the intermediate core between two fiber-reinforced thermoplastic panels, and place it in the second mold In the process of closing the mold, adjust the pressure of the second mold to 0.2MPa-5MPa, and keep the heat and pressure for 15s-150s, so that the fiber-reinforced thermoplastic panel and the middle core are hot-compressed together, and they are demoulded after rapid cooling within 30s-90s to obtain Honeycomb sandwich panel; S4. Embedding the honeycomb sandwich middle plate into the injection mold, injecting the honeycomb sandwich middle plate, forming hemming on the periphery of the honeycomb sandwich middle plate, and obtaining the honeycomb sandwich structure. 2. The preparation method of the honeycomb sandwich structure according to claim 1, characterized in that: between the step S3 and the step S4, there is also a step S31: removing the flash on the periphery of the honeycomb sandwich middle plate . 3. The preparation method of the honeycomb sandwich structure according to claim 1, characterized in that: the honeycomb core in the step S1 is a PE honeycomb core, a PP honeycomb core, a PVC honeycomb core, a PC honeycomb core, a PET honeycomb core, One of paper honeycomb core, Nomex honeycomb core and aluminum honeycomb core, the thickness is 3mm-30mm. 4. The preparation method of the honeycomb sandwich structure according to claim 1, characterized in that: in the step S1, the foam is PVC foam, PS foam, PU foam, PUR foam, PEI foam, PI foam, PMI foam, A combination of one or more of PPSU foam and SAN foam, the density of the foam is 40-200kg/m ³ . 5. The preparation method of the honeycomb sandwich structure according to claim 1, characterized in that: in the step S2, the first non-woven layer and the second non-woven layer are all selected from polypropylene, polyester, nylon, acrylic , polyethylene, polyvinyl chloride, the square grammage is 10g/m ² -100g/m ² . 6. The method for preparing a honeycomb sandwich structure according to claim 1, characterized in that: the first hot-melt adhesive film layer and the second hot-melt adhesive film layer in the step S2 are selected from the same hot-melt adhesive film layer , and are all selected from one of PO hot melt adhesive film, TPU hot melt adhesive film, PA hot melt adhesive film, EVA hot melt adhesive film and PES hot melt adhesive film, with a thickness of 0.05mm-0.3mm. 7. The method for preparing a honeycomb sandwich structure according to claim 1, characterized in that: in the step S3, the thickness of the fiber-reinforced thermoplastic panel is 0.2mm-3mm, and the volume content of the fiber is 35%-65%, The fiber-reinforced thermoplastic panel is composed of a resin matrix and a reinforcing phase, and the resin matrix is HDPE, LDPE, PP, PC, PC/ABS alloy, TPU, PA6, PA66, PA11, PA12, PPS, PEK, PEEK, PI, One of PEI, PMMA, PLA, POM, PET and PBT, the reinforcing phase is continuous glass fiber, carbon fiber, aramid fiber, basalt fiber, PBO fiber, UHMWPE fiber, PET fiber, alumina fiber, silicon carbide fiber One or more of woven fabrics, unidirectional fabrics, and mixed fabrics of woven fabrics and unidirectional fabrics. 8. The method for preparing a honeycomb sandwich structure according to claim 1, characterized in that: in the step S4, the plastic used for injection molding is glass fiber or carbon fiber reinforced plastic, and the weight content of the fiber is 5%-65%. The plastic matrix in the glass fiber or carbon fiber reinforced plastic is HDPE, LDPE, PP, PC, PC/ABS alloy, TPU, PA6, PA66, PA11, PA12, PPS, PEK, PEEK, PI, PEI, PMMA, PLA, POM One of , PET and PBT.