CN109177349B - Foam honeycomb sandwich board and preparation method and application thereof - Google Patents
Foam honeycomb sandwich board and preparation method and application thereof Download PDFInfo
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- CN109177349B CN109177349B CN201811131084.7A CN201811131084A CN109177349B CN 109177349 B CN109177349 B CN 109177349B CN 201811131084 A CN201811131084 A CN 201811131084A CN 109177349 B CN109177349 B CN 109177349B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
Abstract
The invention discloses a foam honeycomb sandwich board which is of a layered structure and sequentially comprises a lower board layer, a first honeycomb core layer, a foam layer, a second honeycomb core layer and an upper board layer from bottom to top. The invention also discloses two different preparation methods of the foam honeycomb sandwich board and application of the foam honeycomb sandwich board in high-speed motor train units, urban rails and subway vehicles. The middle layer of the foam honeycomb sandwich board is formed by compounding a first honeycomb core layer, a foam layer and a second honeycomb core layer into a whole, and the existence of the foam layer blocks air convection in honeycomb holes, so that the sound insulation and heat insulation performance of the sandwich board is enhanced; compared with the traditional honeycomb sandwich board, when the foam honeycomb sandwich board product is impacted, the impact force is transmitted to the foam layer through the panel and the honeycomb core layer, so that the impact force borne by the panel and the honeycomb core layer is reduced, and the impact resistance of the sandwich board is improved.
Description
Technical Field
The invention belongs to the field of composite materials, and particularly relates to a foam honeycomb sandwich board and a preparation method and application thereof.
Background
With the higher requirements of high-speed trains on vehicle weight reduction, various new materials and new structures suitable for being installed in the high-speed trains are continuously emerging. At present, the honeycomb sandwich plate with the characteristics of light weight, high strength, good flame retardance, strong corrosion resistance, easy forming and the like is more and more widely applied to rail vehicles at home and abroad.
However, the traditional honeycomb sandwich board is a composite board formed by bonding paper honeycombs between an upper layer of panel and a lower layer of panel, and has the following defects: (1) the shock resistance is not strong, and the shock resistance is easy to damage; (2) the two panels are connected through the single-layer honeycomb, sound and heat can be directly transmitted to the other panel from one panel, and the sound insulation and heat insulation performance of the sandwich panel is greatly weakened.
In order to overcome the defects of the conventional honeycomb sandwich panel, researchers improve the defects in various aspects, such as: chinese patent CN 101700701a discloses a method for manufacturing a foam honeycomb core, which comprises stretching the honeycomb core, stacking the honeycomb core and a foaming material, and putting the stacked honeycomb core and the foaming material into a flat press for extrusion and combination, thereby enhancing the sandwich strength of the foam honeycomb plate, and having good sound insulation effect, fire resistance and thermal insulation performance. However, the method is easy to collapse the paper honeycomb core, and the technological operation process is not easy to control. Chinese patent CN 103203883A discloses a preparation method of a honeycomb reinforced phenolic foam composite material, which comprises the steps of pouring a phenolic resin foaming composite material into a mould, vertically placing a honeycomb into the mould, placing the honeycomb into the phenolic resin foaming composite material, and placing the mould into an oven for foaming to obtain the honeycomb reinforced phenolic foam composite material. However, the forming process of the method is complex, and the filling consistency of the honeycomb reinforced phenolic foam composite material prepared by the method is difficult to ensure due to the obstruction of honeycomb holes.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects and shortcomings in the background technology and providing a foam honeycomb sandwich board with a specific structure and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides a foam honeycomb sandwich panel, is laminated structure, from supreme down, includes lower panel layer, first honeycomb sandwich layer, foam layer, second honeycomb sandwich layer and last panel layer in proper order.
The invention separates two honeycomb core layers by using the foam layer, and has multiple functions: the sandwich board has the advantages that the sandwich board has an anti-seismic buffering effect, when the sandwich board is subjected to impact force, the impact force is transmitted to the foam layer through the panel and the honeycomb core layer, the foam layer is made of high-molecular porous foam materials and has an energy absorption characteristic, the transmitted impact force is absorbed by the buffering effect, and the damage of the impact force to the sandwich board is reduced; the sound insulation effect is achieved, sound bridges in honeycomb core holes are broken by the foam layer, the foam layer is a high-molecular porous foaming sound absorption material, and the sound insulation effect of the sandwich board can be greatly improved due to the foam layer; and thirdly, the heat insulation and preservation function is achieved, the heat transfer performance of the foam material is low, and the micro-pores in the foam material prevent the convection heat transfer function formed by air circulation, so that the heat insulation and preservation performance of the foam honeycomb sandwich board is enhanced.
In the above foam honeycomb sandwich panel, preferably, the two surfaces of the foam layer are provided with integrally formed ribs; the distribution mode of the ribs on the surface of the foam layer comprises transverse distribution and longitudinal distribution. The arrangement of the transverse longitudinal ribs can improve the L-direction and W-direction shearing strength of the foam honeycomb sandwich board, and the ribs sunk into the grooves can play a role of reinforcing ribs under the condition that the adhesive film bonding layer fails, so that the shearing resistance of the sandwich board is improved.
In the foam honeycomb sandwich board, preferably, the first honeycomb core layer and the second honeycomb core layer are both provided with grooves matched with the ribs on the foam layer. The depth of the grooves on the surface of the honeycomb core layer is 3-8mm, and the height of the ribs on the surface of the foam layer is 3-8 mm.
Preferably, a glue film is arranged between each layered structure of the foam honeycomb sandwich board; the adhesive film is a medium-temperature curing epoxy adhesive film. The layers are bonded through the adhesive film, and the interlayer bonding force between the honeycomb core layer and the foam layer can be ensured after molding. Because the glue film and the honeycomb layer are combined to be in line contact, and the foam layer is of a rigid structure, the defects of degumming, bubbles and the like can exist in the curing process, the firm bonding of the whole plane is difficult to ensure, when the sandwich panel is subjected to transverse load, the upper panel and the lower panel mainly bear tensile stress and compressive stress, the middle core layer mainly bears shear stress, the upper panel, the lower panel and the core layer have enough shear strength and toughness, if the bonding layer has the defects of degumming, bubbles and the like, the bonding layer can be damaged too early, and the shear strength of the whole sandwich panel is influenced. According to the sandwich panel, the transverse longitudinal ribs are arranged on the foam layer, the corresponding grooves are formed in the honeycomb layer, the ribs on the foam layer play a role of reinforcing ribs, and even if the defects of degumming and bubbles exist between the foam layer and the honeycomb layer, the transverse and longitudinal shear strengths of the sandwich panel are not too low due to the matched structure of the ribs and the grooves; the foam layer adopts mould foaming integrated into one piece, according to actual product requirement, can set up rib width and thickness in a flexible way.
In the foam honeycomb sandwich panel, preferably, the lower surface plate layer and the upper surface plate layer are made of fiber material prepreg, and the fiber material is woven or mixed woven by one or more of carbon fiber, aramid fiber and glass fiber; the first honeycomb core layer and the second honeycomb core layer are made of paper honeycombs or aluminum honeycombs; the foam layer material is any one of phenolic foam, PVC foam, polyurethane foam and polyimide foam.
In the foam honeycomb sandwich board, the thickness of the first honeycomb core layer and the second honeycomb core layer is preferably 5-20mm, and the thickness of the foam layer is preferably 3-10 mm.
As a general inventive concept, the present invention also provides a method for preparing the above-mentioned foam honeycomb sandwich panel, comprising the steps of:
(1) grooving the honeycomb core layer material, and forming grooves matched with the ribs on the foam layer on the surface of the honeycomb core layer material;
(2) according to the sequence of the layered structure of the foam honeycomb sandwich board, sequentially paving a fiber material prepreg, an adhesive film, a grooved honeycomb core layer, an adhesive film, a foam layer, an adhesive film, a grooved honeycomb core layer, an adhesive film and a fiber material prepreg on a mold, performing hot-mold forming after paving, and obtaining the foam honeycomb sandwich board after forming.
In the above preparation method, preferably, in the step (2), the hot-die-pressing process is divided into three sections: the first stage is to heat the temperature from room temperature to 90-100 ℃, keep the temperature for 10-30 min, and keep the unit surface pressure (the force on the sandwich plate/the area of the sandwich plate in the hot pressing process) at 0.1-0.2 MPa; in the second stage, the temperature is continuously increased to 130-150 ℃, the temperature is kept for 1.0-2.0 h, and the unit pressure is kept at 0.3-0.8 MPa; the third stage is to cool the temperature from 130-150 ℃ to 30-60 ℃, and finally to release the pressure to the atmospheric pressure.
As a general inventive concept, the present invention also provides a method for preparing the above-mentioned foam honeycomb sandwich panel, comprising the steps of:
(1) grooving the honeycomb core layer material, and forming grooves matched with the ribs on the foam layer on the surface of the honeycomb core layer material; further preferably, grooving is carried out through CNC, and the rotating speed of a main shaft is controlled to be over 12000r/min during CNC machining;
(2) laying a fiber material prepreg, a PET polyester film and the fiber material prepreg on a mould in sequence, and then carrying out hot die pressing to form an upper panel and a lower panel;
(3) and (3) sequentially paving the lower panel, the glue film, the honeycomb core layer subjected to slotting treatment, the glue film, the foam layer, the glue film, the honeycomb core layer subjected to slotting treatment, the glue film and the upper panel prepared in the step (2) on a mold, carrying out secondary hot-mold forming, opening the mold after forming, and taking out the foam honeycomb sandwich panel.
In the preparation method, preferably, in the step (2), the hot-die-pressing forming process is divided into three sections, wherein in the first section, the temperature is increased from room temperature to 90-100 ℃, the temperature is kept for 10-30 min, and the unit area pressure is kept at 1-2 MPa; in the second stage, the temperature is continuously increased to 130-150 ℃, the temperature is kept for 1.0-2.0 h, and the unit pressure is kept at 5-8 MPa; the third stage is to cool the temperature from 130 to 150 ℃ to 30 to 60 ℃ and release the pressure to atmospheric pressure;
in the step (3), the process conditions of the secondary hot die pressing molding are as follows: heating to 130-150 ℃, preserving the heat for 1.0-2.0 h, and keeping the unit surface pressure at 0.3-0.8 MPa.
As a general inventive concept, the invention also provides an application of the foam honeycomb sandwich panel or the foam honeycomb sandwich panel obtained by the preparation method in high-speed motor train units, urban rails and subway vehicles, such as floors, door panels, partition walls, skirtboards and the like.
Compared with the prior art, the invention has the advantages that:
(1) the middle layer of the foam honeycomb sandwich board is formed by compounding the first honeycomb core layer, the foam layer and the second honeycomb core layer into a whole, and the existence of the foam layer blocks air convection in honeycomb holes, so that the sound insulation and heat insulation performance of the sandwich board is enhanced.
(2) The ribs are arranged on the upper surface and the lower surface of the foam layer, and the grooves are formed in the surfaces of the first honeycomb core layer and the second honeycomb core layer, so that the ribs on the foam layer are matched with the grooves of the honeycomb core layer, and the shear resistance of the middle layer of the sandwich board can be improved; and the bonding is realized through the adhesive film, so that the interlayer bonding force between the honeycomb core layer and the foam layer is increased.
(3) Compared with the traditional honeycomb sandwich board, when the foam honeycomb sandwich board product is impacted, the impact force is transmitted to the foam layer through the panel and the honeycomb core layer, so that the impact force borne by the panel and the honeycomb core layer is reduced, and the impact resistance of the sandwich board is improved.
(4) The preparation method of the invention is hot press molding, which can mold both a plane sandwich board and a curved sandwich board, wherein the plane sandwich board can be formed by one-time hot press molding, and the curved sandwich board can be formed by multiple hot press molding, thereby ensuring the bonding strength between panels, between panels and a honeycomb layer, between the honeycomb layer and a foam layer.
(5) In the preparation method, the foam material is not required to be pressed into the honeycomb core hole, the paper honeycomb is not crushed, and the prepared foam honeycomb plate also has the sound insulation and heat preservation effects.
Drawings
FIG. 1 is a schematic structural view of a foam honeycomb sandwich panel in example 1 of the present invention.
Fig. 2 is an exploded view of a foam honeycomb sandwich panel according to example 1 of the present invention.
FIG. 3 is a schematic view of the foam layer of the foam honeycomb sandwich panel of example 1 of the present invention.
FIG. 4 is a schematic representation of a foam honeycomb sandwich panel of example 1 after grooving the honeycomb core.
Illustration of the drawings:
1. a lower panel layer; 2. a first honeycomb core layer; 3. a foam layer; 4. a second honeycomb core layer; 5. an upper panel layer; 6. and (5) coating the film.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1:
a foam honeycomb sandwich panel (planar sandwich panel) is of a layered structure, is shown in figure 1 in a schematic structural diagram, is shown in figure 2 in an exploded structural diagram, and sequentially comprises a lower plate layer 1, a first honeycomb core layer 2, a foam layer 3, a second honeycomb core layer 4 and an upper plate layer 5 from bottom to top; both surfaces of the foam layer 3 (thickness 4mm) are provided with transverse and longitudinal ribs (height 4mm) formed integrally, as shown in fig. 3; grooves (the depth of the grooves is 4mm) matched with the ribs on the foam layer 3 are arranged on the first honeycomb core layer 2 and the second honeycomb core layer 4 respectively, as shown in figure 4; a medium-temperature curing epoxy adhesive film 6 is arranged between each layered structure, and the thickness of each layer of the medium-temperature curing epoxy adhesive film is 0.1 mm; the lower plate layer 1 and the upper plate layer 5 are made of glass fiber flame-retardant phenolic prepreg (gram weight 350 g/m)2Resin content 47%); the first honeycomb core layer 2 and the second honeycomb core layer 4 are paper honeycombs; the foam layer 3 is phenolic foam; the first honeycomb core thickness and the second honeycomb core thickness were 8 mm.
The preparation method of the foam honeycomb sandwich panel comprises the following steps:
(1) grooving paper honeycombs (a first honeycomb core layer 3 and a second honeycomb core layer 7 which are used as foam honeycomb sandwich plates) by CNC (computer numerical control) machining, wherein the rotating speed of a main shaft is controlled to be over 12000r/min during the CNC machining;
(2) sequentially paving 4 layers of 0.3mm thick glass fiber flame-retardant phenolic prepreg, medium-temperature cured epoxy film, slotted treated paper honeycomb, medium-temperature cured epoxy film, phenolic foam, medium-temperature cured epoxy film, slotted treated paper honeycomb, medium-temperature cured epoxy film and 4 layers of 0.3mm thick glass fiber flame-retardant phenolic prepreg on a mould, after paving is completed, closing the mould, placing the mould on a hot press, performing hot press molding, wherein the molding process is divided into three sections, namely a first section: heating to 90 deg.C at 2 deg.C/min, maintaining the temperature for 30min, and maintaining the unit surface pressure at 0.1 MPa; and a second stage: heating to 140 ℃ at the speed of 2 ℃/min, preserving the heat for 2.0h, and keeping the unit pressure at 0.45 MPa; a third stage: cooling from 140 deg.C to 50 deg.C at 3 deg.C/min, and relieving pressure to atmospheric pressure;
(3) and after hot-pressing curing molding, opening the mold and taking out the foam honeycomb sandwich board.
Example 2:
the invention relates to a foam honeycomb sandwich panel (curved surface sandwich panel), which is of a layered structure and sequentially comprises a lower panel layer, a first honeycomb core layer, a foam layer, a second honeycomb core layer and an upper panel layer from bottom to top; the two surfaces of the foam layer (the thickness is 4mm) are provided with transverse and longitudinal ribs (the height of the ribs is 4mm) which are integrally formed; grooves (the depth is 4mm) matched with the ribs on the foam layer are arranged on the first honeycomb core layer and the second honeycomb core layer; intermediate-temperature curing epoxy glue films are arranged among the layered structures, and the thickness of each intermediate-temperature curing epoxy glue film is 0.1 mm; the lower plate layer and the upper plate layer are made of glass fiber flame-retardant phenolic prepreg (gram weight is 350 g/m)2Resin content 47%); the first honeycomb core layer and the second honeycomb core layer are paper honeycombs; the foam layer is phenolic foam; the first honeycomb core thickness and the second honeycomb core thickness were 8 mm.
The preparation method of the foam honeycomb sandwich panel comprises the following steps:
(1) grooving paper honeycombs (serving as a first honeycomb core layer and a second honeycomb core layer of a foam honeycomb sandwich plate) by CNC (computer numerical control) machining, wherein the rotating speed of a main shaft is controlled to be over 12000r/min during the CNC machining;
(2) laying 4 layers of 0.3mm glass fiber flame-retardant phenolic prepreg, a PET polyester film (used for separating an upper panel from a lower panel) and 4 layers of 0.3mm glass fiber flame-retardant phenolic prepreg on a mould in sequence, and carrying out hot press molding to prepare an upper panel and a lower panel, wherein the hot press process is divided into three sections, namely a first section: heating to 90 deg.C at 2 deg.C/min, maintaining the temperature for 30min, and maintaining the unit surface pressure at 0.1 MPa; and a second stage: heating to 140 ℃ at the speed of 2 ℃/min, preserving the heat for 2.0h, and keeping the unit pressure at 5 MPa; a third stage: cooling from 140 deg.C to 50 deg.C at 3 deg.C/min, relieving pressure to atmospheric pressure, and taking out the formed upper and lower panels;
(3) sequentially paving the lower panel prepared in the step (2), the medium-temperature curing epoxy film, the paper honeycomb subjected to slotting treatment, the medium-temperature curing epoxy film, the phenolic foam, the medium-temperature curing epoxy film, the paper honeycomb subjected to slotting treatment, the medium-temperature curing epoxy film and the upper panel prepared in the step (2) on a die, and performing secondary hot die pressing, wherein the molding process parameters are as follows: heating to 140 ℃ from 50 ℃ at a speed of 2 ℃/min, preserving heat and curing for 1h, keeping the unit surface pressure at 0.45MPa, opening the mold after curing and molding, and taking out the foam honeycomb sandwich board.
The foam honeycomb sandwich panels prepared in example 1 and example 2 were tested for their relevant properties and the results are shown in table 1.
TABLE 1 foam Honeycomb Sandwich Panel Performance test results
Claims (9)
1. A foam honeycomb sandwich panel is characterized in that the foam honeycomb sandwich panel is of a layered structure and sequentially comprises a lower panel layer (1), a first honeycomb core layer (2), a foam layer (3), a second honeycomb core layer (4) and an upper panel layer (5) from bottom to top; a glue film is arranged between each layered structure; the thickness of the foam layer (3) is 3-10 mm; the foam layer (3) is made of any one of phenolic foam, PVC foam, polyurethane foam and polyimide foam; the lower surface plate layer (1) and the upper surface plate layer (5) are made of fiber materials, and the fiber materials are woven or mixed woven by one or more of carbon fibers, aramid fibers and glass fibers.
2. The foam honeycomb sandwich panel according to claim 1, characterized in that both surfaces of the foam layer (3) are provided with integrally formed ribs; the distribution mode of the ribs on the surface of the foam layer (3) comprises transverse distribution and longitudinal distribution; all be provided with on first honeycomb sandwich layer (2) and second honeycomb sandwich layer (4) with rib assorted recess on foam layer (3).
3. The foam honeycomb sandwich panel according to any one of claims 1 to 2, wherein the material of the first honeycomb core layer (2) and the second honeycomb core layer (4) is paper honeycomb or aluminum honeycomb.
4. The foamed honeycomb sandwich panel according to any one of claims 1 to 2, wherein the first honeycomb core layer (2) and the second honeycomb core layer (4) have a thickness of 5 to 20 mm.
5. A method for preparing the foam honeycomb sandwich panel according to any one of claims 1 to 4, comprising the following steps:
(1) grooving the honeycomb core layer material, and forming grooves matched with the ribs on the foam layer (3) on the surface of the honeycomb core layer material;
(2) according to the sequence of the layered structure of the foam honeycomb sandwich board, sequentially paving a fiber material prepreg, an adhesive film, a grooved honeycomb core layer, an adhesive film, a foam layer, an adhesive film, a grooved honeycomb core layer, an adhesive film and a fiber material prepreg on a mold, performing hot-mold forming after paving, and obtaining the foam honeycomb sandwich board after forming.
6. The manufacturing method according to claim 5, wherein in the step (2), the hot press molding process is divided into three sections: the first stage is to heat the temperature from room temperature to 90-100 ℃, keep the temperature for 10-30 min and keep the unit surface pressure at 0.1-0.2 MPa; in the second stage, the temperature is continuously increased to 130-150 ℃, the temperature is kept for 1.0-2.0 h, and the unit pressure is kept at 0.3-0.8 MPa; the third stage is to cool the temperature from 130-150 ℃ to 30-60 ℃, and finally to release the pressure to the atmospheric pressure.
7. A method for preparing the foam honeycomb sandwich panel according to any one of claims 1 to 4, comprising the following steps:
(1) grooving the honeycomb core layer material, and forming grooves matched with the ribs on the foam layer (3) on the surface of the honeycomb core layer material;
(2) laying a fiber material prepreg, a PET polyester film and the fiber material prepreg on a mould in sequence, and then carrying out hot die pressing to form an upper panel and a lower panel;
(3) and (3) sequentially paving the lower panel, the glue film, the honeycomb core layer subjected to slotting treatment, the glue film, the foam layer, the glue film, the honeycomb core layer subjected to slotting treatment, the glue film and the upper panel prepared in the step (2) on a mold, carrying out secondary hot-mold forming, opening the mold after forming, and taking out the foam honeycomb sandwich panel.
8. The preparation method according to claim 7, wherein in the step (2), the hot-die-pressing process is divided into three stages, wherein the first stage is to heat the temperature from room temperature to 90-100 ℃ and keep the temperature for 10-30 min, and the unit area pressure is kept at 1-2 MPa; in the second stage, the temperature is continuously increased to 130-150 ℃, the temperature is kept for 1.0-2.0 h, and the unit pressure is kept at 5-8 MPa; the third stage is to cool the temperature from 130 to 150 ℃ to 30 to 60 ℃ and release the pressure to atmospheric pressure;
in the step (3), the process conditions of the secondary hot die pressing molding are as follows: heating to 130-150 ℃, preserving the heat for 1.0-2.0 h, and keeping the unit surface pressure at 0.3-0.8 MPa.
9. Application of the foam honeycomb sandwich panel according to any one of claims 1 to 4 or the foam honeycomb sandwich panel obtained by the preparation method according to any one of claims 5 to 8 in high-speed motor train units, urban rails and subway vehicles.
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| CN112060733A (en) * | 2020-08-14 | 2020-12-11 | 贵州航天建设工程有限公司 | Polyimide-phosphogypsum color steel sandwich board and preparation method thereof |
| CN112406218A (en) * | 2020-11-12 | 2021-02-26 | 西安长峰机电研究所 | Shelter composite foamed aluminum sandwich plate structure |
| CN112776429B (en) * | 2021-01-20 | 2023-10-13 | 江苏玫源新材料有限公司 | Novel far infrared heater and preparation method thereof |
| CN112976701A (en) * | 2021-03-03 | 2021-06-18 | 北京汽车研究总院有限公司 | Honeycomb panel, manufacturing method thereof, vehicle body panel and vehicle |
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| CN204780465U (en) * | 2015-05-22 | 2015-11-18 | 珠海正业包装有限公司 | Multi -functional composite paperboard of high strength |
| CN207549612U (en) * | 2017-11-27 | 2018-06-29 | 温州富捷科技股份有限公司 | A kind of high strength composite paper board |
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