CN221923052U - Bio-based polyamide honeycomb core - Google Patents
Bio-based polyamide honeycomb core Download PDFInfo
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- CN221923052U CN221923052U CN202323420120.0U CN202323420120U CN221923052U CN 221923052 U CN221923052 U CN 221923052U CN 202323420120 U CN202323420120 U CN 202323420120U CN 221923052 U CN221923052 U CN 221923052U
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- unidirectional prepreg
- honeycomb core
- prepreg tape
- hollow cylinder
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- 229920006021 bio-based polyamide Polymers 0.000 title claims abstract description 65
- 239000000835 fiber Substances 0.000 claims abstract description 40
- 239000010410 layer Substances 0.000 claims description 48
- 239000004744 fabric Substances 0.000 claims description 20
- 239000003365 glass fiber Substances 0.000 claims description 14
- 239000012790 adhesive layer Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 239000011162 core material Substances 0.000 description 28
- 239000002131 composite material Substances 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Laminated Bodies (AREA)
Abstract
The utility model relates to a bio-based polyamide honeycomb core, which comprises a plurality of hollow columns arranged in rows, wherein the side wall of each hollow column at least comprises a layer of unidirectional prepreg tape, the trend of continuous fibers in the side wall and the height direction of each hollow column are crossed to form an alpha angle which is more than or equal to 0 degree and less than or equal to 90 degrees, and the unidirectional prepreg tape is a continuous fiber reinforced bio-based polyamide unidirectional prepreg tape. The honeycomb core structure has excellent strength, and meets the energy conservation and emission reduction and light weight design requirements in different fields.
Description
Technical Field
The utility model relates to the technical field of composite materials, in particular to a bio-based polyamide honeycomb core.
Background
A honeycomb panel is a sheet of material having a honeycomb-like geometry. The plastic honeycomb board has the characteristics of light weight, high strength, heat insulation, sound insulation and the like, can replace the traditional metal plates, paperboards, wood boards and the like, is used in the fields of building templates, trucks, refrigerated trucks, logistics cars, movable board houses, yachts, partitions and the like, and has very wide application. The traditional plastic honeycomb composite board is formed by heating and compounding honeycomb structural materials which are made of polypropylene fiber composite yarn fabrics or prepreg tapes on the upper surface and the lower surface, and core materials are polypropylene raw materials, and has the problems that the honeycomb core structure strength is limited, and the use requirement is difficult to meet in application occasions with high requirements on mechanical properties. The bio-based polyamide honeycomb core composite material which is more beneficial to sustainable development planning and meets the requirements of energy conservation and emission reduction and light weight design in different fields needs to be explored.
Disclosure of utility model
The utility model aims to provide a bio-based polyamide honeycomb core which has excellent structural strength and meets the design requirements of energy conservation, emission reduction and light weight in different fields.
In order to achieve the above object, the present utility model provides a bio-based polyamide honeycomb core, the honeycomb core comprises a plurality of hollow columns arranged in a row, the side walls of the hollow columns comprise at least one layer of unidirectional prepreg tapes, the directions of continuous fibers in the side walls intersect with the height direction of the hollow columns to form an angle alpha, and alpha is more than or equal to 0 DEG and less than or equal to 90 DEG, wherein the unidirectional prepreg tapes are continuous fiber reinforced bio-based polyamide unidirectional prepreg tapes.
Wherein when the angle alpha is zero degrees, the trend of the continuous fibers in the side wall is parallel to the height direction of the hollow column; when the angle α is 90 degrees, it indicates that the continuous fibers in the sidewall run perpendicular to the height of the hollow cylinder.
The continuous fiber reinforced bio-based polyamide unidirectional prepreg tape of the present utility model is a tape-shaped prepreg which can be made by impregnating bio-based polyamide resin with continuous fibers parallel to each other, which belongs to a composite material known in the art, preferably purchased from kesai organism.
According to the utility model, the prefabricated bio-based polyamide unidirectional prepreg tape is subjected to hot pressing, and then spliced and bonded to form a plurality of hollow columns arranged in rows, so that the honeycomb structural material is obtained, and the honeycomb core side wall formed by the continuous fiber reinforced bio-based polyamide unidirectional prepreg tape endows the honeycomb core with excellent mechanical properties, so that the method is beneficial to sustainable development planning, and can meet the energy conservation, emission reduction and light weight design requirements of different fields.
Preferably, the α is 45 ° or 90 °. Preferably the alpha angle is more advantageous for obtaining higher mechanical properties in different angular directions of the honeycomb core.
In some embodiments, the sidewall contains more than two layers of unidirectional prepreg tape, and the intersection of continuous fibers in adjacent two layers of unidirectional prepreg tape is 0-90 °, preferably 90 ° or 45 °.
In some embodiments, the unidirectional prepreg tape has a thickness of 0.15 to 0.5mm, preferably 0.2 to 0.35mm, for example 0.25mm,0.31mm,0.32mm,0.33mm.
In some embodiments, the sidewall of the hollow cylinder has a thickness of 0.15-2.0mm.
In some embodiments, the hollow cylinder has a height of 10-200mm.
In some embodiments, the cross section of the hollow cylinder is any one of a circle, an ellipse, a polygon, or a combination thereof. Preferably, the polygon is a rounded polygon.
Preferably, the polygon is selected from any one of rectangle, square, diamond, hexagon or a combination thereof. Preferably, the hexagons are regular hexagons, more preferably rounded regular hexagons.
In some embodiments, the hollow cylinder has a cross-section with a maximum diameter of 0.6-4.0cm, preferably 0.8-1.8cm. The maximum diameter refers to the distance between two furthest apart points of the cross-sectional edge, when the cross-section is circular, the maximum diameter is the circular diameter.
In some embodiments, the hollow cylinder has a cross-sectional area of 0.5 to 10 square centimeters, preferably 1 to 5 square centimeters.
In some specific embodiments, the unidirectional prepreg tape is selected from the group consisting of a biobased polyamide continuous glass fiber unidirectional prepreg tape, a biobased polyamide continuous aramid fiber unidirectional prepreg tape, a biobased polyamide continuous basalt fiber unidirectional prepreg tape, a biobased polyamide continuous polyolefin fiber unidirectional prepreg tape, or a biobased polyamide continuous carbon fiber unidirectional prepreg tape, or a combination thereof, such as the continuous long fiber reinforced long carbon chain polyamide resin unidirectional prepreg tape disclosed in chinese patent application CN113232384 a.
In some embodiments, the unidirectional prepreg tape has a continuous fiber volume fraction of 30-55% vf. The volume ratio refers to the volume of the continuous fibers to the volume of the prepreg tape.
According to an embodiment of the utility model, the bio-based polyamide in the continuous fiber reinforced bio-based polyamide unidirectional prepreg tape is for example selected from the group consisting of bio-based polyamide PA56, bio-based polyamide PA510, bio-based polyamide PA511, bio-based polyamide PA512, bio-based polyamide PA513, bio-based polyamide PA514, bio-based polyamide PA515 and bio-based polyamide PA516, bio-based polyamide PA56/5T, bio-based polyamide PA510/5T, bio-based polyamide PA511/5T, bio-based polyamide PA512/5T, bio-based polyamide PA513/5T, bio-based polyamide PA514/5T, bio-based polyamide PA515/5T, bio-based polyamide PA516/5T, bio-based polyamide PA56/5I, commercially available
Any one or a combination of a plurality of them.
In some embodiments, the unidirectional prepreg tape has a density of 1.5 to 2.0g/cm 3.
In some embodiments, the side walls of the hollow cylinder further comprise a fiber cloth.
In some specific embodiments, the fiber cloth is a fiberglass cloth, such as a plain weave fiberglass cloth or a twill weave fiberglass cloth.
In some embodiments, the fibrous web has a thickness of 0.1 to 0.4mm, preferably 0.175 to 0.193mm. For example, three right twill glass fiber cloths with a thickness of 0.175mm and twill glass fiber cloths with a thickness of 0.185 mm.
In some specific embodiments, the side wall of the hollow cylinder is provided with an inner layer, an intermediate layer and an outer layer, wherein the inner layer and the outer layer respectively contain at least one layer of unidirectional prepreg tape, and the intermediate layer contains at least one layer of fiber cloth.
In some specific embodiments, the side wall of the hollow cylinder is provided with an inner layer, an intermediate layer and an outer layer, wherein the inner layer and the outer layer respectively comprise a layer of unidirectional prepreg tape, and the intermediate layer comprises a layer of glass fiber cloth.
In some embodiments, the outer side of the side wall of the hollow cylinder is further provided with an adhesive layer. The adhesive layer is used to further bond the aligned hollow columns.
In some preferred embodiments, when the cross section of the hollow cylinder is hexagonal or rounded hexagonal, the hollow cylinder is formed by surrounding six side walls, wherein the outer surfaces of the six side walls are provided with adhesive layers, or the outer sides of only two side walls facing each other are provided with adhesive layers.
In some preferred embodiments, when the cross section of the hollow cylinder is elliptical or circular, the hollow cylinder is a cylinder or elliptical cylinder, wherein an adhesive layer is provided on the outside of the cylinder sidewall.
In some embodiments, the material of the tie layer is selected from resins having a melting point in the range of 60-220 ℃.
In some embodiments, the material of the tie layer is selected from PE-g-MAH, PP-g-MAH, POE-g-MAH, EPDM-g-MAH, ABS-g-MAH, PS-g-MAH, EVA resin, polyurethane, epoxy resin, or acrylic resin. Preferably a room temperature curing binder.
The utility model provides a composite plate-like material with a geometric shape similar to a honeycomb structure, which comprises
The light, high-strength, heat-insulating and sound-insulating properties, can replace traditional metal plates, paperboards, wood boards and the like, can be used in the fields of building templates, trucks, refrigerated trucks, logistics vehicular cabins, movable plank houses, yachts, partitions and the like, and has very wide application.
Drawings
FIG. 1 is a schematic view of a honeycomb core according to the present utility model;
FIG. 2 is a schematic view of a hollow column according to the present utility model;
FIG. 3 is a schematic view of another hollow cylinder according to the present utility model;
FIG. 4 is a schematic cross-sectional view of a hollow cylinder of the present utility model;
FIG. 5 is a schematic view of a hollow cylinder according to another embodiment of the present utility model;
Fig. 6 shows a schematic view of another honeycomb core structure of the present utility model.
Description of element numbers:
1: a hollow cylinder with a hexagonal cross section;
2: the side wall of the hollow cylinder;
3: a hollow cylinder with a circular cross section;
211. 311: the height direction of the hollow column;
221. 231, 321: the unidirectional prepreg tape, the continuous fiber trend is parallel to the height direction of the hollow column;
222. 232, 322: unidirectional prepreg tape, continuous fiber trend and hollow column height direction cross 90 degrees;
233: glass fiber cloth;
241. 242, 243, 244, 245, 246: six side walls of the hexagonal hollow cylinder are respectively represented;
252. 253). And respectively an adhesive layer.
Detailed Description
Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for the purpose of understanding and reading the disclosure, and are not intended to limit the scope of the utility model, which is defined by the appended claims, but rather by the claims, unless otherwise indicated, and unless otherwise indicated, all changes in structure, proportions, or otherwise, used by those skilled in the art, are included in the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.
Example 1
As shown in fig. 1 to 4, the present embodiment provides a bio-based polyamide honeycomb core, the honeycomb core includes a plurality of hollow columns 1 arranged in a row, and the side walls 2 of the hollow columns 1 contain at least one layer of unidirectional prepreg tape, wherein the unidirectional prepreg tape is any one of bio-based polyamide continuous glass fiber unidirectional prepreg tape, bio-based polyamide continuous aramid fiber unidirectional prepreg tape, bio-based polyamide continuous basalt fiber unidirectional prepreg tape, bio-based polyamide continuous polyolefin fiber unidirectional prepreg tape, or bio-based polyamide continuous carbon fiber unidirectional prepreg tape.
The cross section of the hollow cylinder is any one or combination of a hexagon or a rounded hexagon. The maximum diameter of the cross section of the hollow cylinder is 0.6-4.0cm, preferably 0.8-1.8cm. The cross-sectional area of the hollow cylinder is 0.5-10 square cm, preferably 1-5 square cm. The continuous fiber volume ratio of the unidirectional prepreg tape is 30-55% vf. The density of the unidirectional prepreg tape is 1.5-2.0g/cm 3.
As shown in fig. 2, the thickness of the side wall 2 of the hollow cylinder is 0.15-2.0mm, which comprises two layers of unidirectional prepreg tapes 221 and 222, wherein the continuous fiber trend in the unidirectional prepreg tape 221 is parallel to the height direction of the hollow cylinder, and the continuous fiber trend in the unidirectional prepreg tape 222 is crossed with the height direction of the hollow cylinder by 90 degrees. The thickness of the unidirectional prepreg tapes 221 and 222 is 0.15 to 0.5mm.
As shown in fig. 3, the thickness of the side wall 2 of the hollow cylinder is 0.15-2.0mm, each of the inside and outside of the side wall is provided with a layer of unidirectional prepreg tape 231 and 232, the continuous fiber trend in the unidirectional prepreg tape 231 is parallel to the height direction of the hollow cylinder, the continuous fiber trend in the unidirectional prepreg tape 232 is crossed by 90 degrees with the height direction of the hollow cylinder, and a layer of interlayer fiber cloth is arranged between the unidirectional prepreg tapes 231 and 232, and the interlayer fiber cloth can be glass fiber cloth, such as plain weave glass fiber cloth or twill weave glass fiber cloth. The thickness of the unidirectional prepreg tapes 231 and 232 is 0.15-0.5mm, and the thickness of the glass fiber cloth is 0.1-0.4mm.
In the application field with high requirements on mechanical properties and lightweight design, preferably, the side wall of the hollow cylinder comprises more than two layers of unidirectional prepreg tapes, and the trend of continuous fibers in two adjacent layers of unidirectional prepreg tapes is crossed to form 90 degrees.
In order to promote the adhesion between the plurality of hollow cylinders and further improve the mechanical properties of the honeycomb core, it is preferable to provide an adhesive layer on the outer side of the side wall of the hollow cylinder. As shown in fig. 4, when the cross section of the hollow cylinder is hexagonal, or when the cross section of the hollow cylinder after rounding the hexagon is rounded, the hollow cylinder is formed by enclosing six side walls 241, 242, 243, 244, 245, 246, and bonding layers 252, 253 are respectively arranged outside the two opposite side walls 241 and 244.
The material of the bonding layer is at least one of PE-g-MAH, PP-g-MAH, POE-g-MAH, EPDM-g-MAH, ABS-g-MAH, PS-g-MAH, EVA, polyurethane, epoxy resin or acrylic resin with the melting point of 60-220 ℃. A normal temperature curable binder is preferred.
The honeycomb core of the embodiment can be obtained by placing a prefabricated bio-based polyamide unidirectional prepreg tape in a die, performing high-temperature compression molding to obtain toothed plates, wherein the toothed plates comprise semi-cylindrical parts and connecting parts which are distributed at intervals, splicing two toothed plates, the connecting parts of the two toothed plates are mutually attached, the semi-cylindrical parts are spliced to form a complete hollow cylinder, a plurality of groups of two toothed plates are overlapped to form a plurality of hollow cylinders arranged in a row, the toothed plates form the side walls of the hollow cylinders, and the side walls of the hollow cylinders are placed at the temperature of 60-220 ℃ for 10-30min, so that the honeycomb core with tight adhesion can be obtained.
Finally, the hollow cylinder can be cut according to specific application scenes to obtain honeycomb core composite materials with different heights.
Example 2
As shown in fig. 5 to 6, similar to embodiment 1, the difference is that the cross section of the hollow cylinder of this embodiment is circular or elliptical. The honeycomb core of the embodiment can be used for manufacturing cylindrical pipes from the bio-based polyamide unidirectional prepreg tape in advance, and then a plurality of cylindrical pipes are overlapped to form a plurality of hollow columns arranged in a row. In particular, PE-g-MAH, PP-g-MAH, POE-g-MAH, EPDM-g-MAH, ABS-g-MAH, PS-g-MAH or EVA resin with the melting point of 60-220 ℃ is preferably arranged on the outer side of the outer wall of the pipe as the bonding layer. Placing a plurality of hollow columns arranged in a row at the temperature of 60-220 ℃ for 10-30min, thus obtaining the honeycomb core with tight adhesion.
The honeycomb cores obtained by specific examples of examples 1 and 2 were subjected to the following mechanical property test, and the results are shown in table 1: test method the honeycomb core is tested for compression performance by referring to GB/T1453-2022 sandwich structure or core flat compression performance test method. The raw material unidirectional prepreg tapes are all: the biobased polyamide continuous glass fiber unidirectional prepreg tape from Kaiser organism has a density of 1.55g/cm 3, a thickness of 0.32mm, and a continuous glass fiber content of 30vol%. The side wall of the hollow column body comprises two layers of unidirectional prepreg tapes, the continuous fiber trend in the unidirectional prepreg tape at the inner layer of the side wall is crossed with the height direction of the hollow column body by 90 degrees, and the continuous fiber trend in the unidirectional prepreg tape at the outer layer of the side wall is parallel with the height direction of the hollow column body (crossed by 0 degrees). The outermost layer of the side wall is provided with a bonding layer POE-g-MAH.
The honeycomb core is made of the continuous fiber reinforced bio-based polyamide composite material, so that the honeycomb core with higher compressive strength can be obtained, which is more than several times of the compressive strength of the traditional PP honeycomb core. The honeycomb core provided by the utility model can meet the energy-saving emission-reduction and light-weight design requirements of different fields.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (12)
1. A biobased polyamide honeycomb core comprising a plurality of hollow cylinders arranged in rows, wherein the side walls of the hollow cylinders comprise at least one layer of unidirectional prepreg tape, the orientation of continuous fibers in the side walls and the height direction of the hollow cylinders intersect at an angle alpha, and alpha is more than or equal to 0 degrees and less than or equal to 90 degrees, wherein the unidirectional prepreg tape is a continuous fiber reinforced biobased polyamide unidirectional prepreg tape.
2. The biobased polyamide honeycomb core of claim 1, wherein the sidewall comprises more than two layers of unidirectional prepreg tapes, and the continuous fibers in adjacent two layers of unidirectional prepreg tapes are oriented at an intersection of 0-90 °.
3. The biobased polyamide honeycomb core of claim 1, wherein the thickness of the side walls of the hollow cylinder is 0.15-2.0mm and/or the thickness of the unidirectional prepreg tape is 0.15-0.5mm.
4. The biobased polyamide honeycomb core of claim 1, wherein the cross section of the hollow cylinder is any one of a circle, an ellipse, a polygon, or a combination thereof, and the polygon is any one of a rectangle, a square, a diamond, a hexagon, or a combination thereof.
5. The biobased polyamide honeycomb core according to claim 1, wherein the cross section of the hollow cylinder has a maximum diameter of 0.6-4.0cm and/or the cross section of the hollow cylinder has an area of 0.5-10 square cm.
6. The biobased polyamide honeycomb core of claim 1, wherein the unidirectional prepreg tape is selected from the group consisting of biobased polyamide continuous glass fiber unidirectional prepreg tape, biobased polyamide continuous aramid fiber unidirectional prepreg tape, biobased polyamide continuous basalt fiber unidirectional prepreg tape, biobased polyamide continuous polyolefin fiber unidirectional prepreg tape, and biobased polyamide continuous carbon fiber unidirectional prepreg tape, or a combination thereof.
7. The biobased polyamide honeycomb core of claim 1 wherein the side walls of the hollow cylinder further comprise a fibrous cloth.
8. The biobased polyamide honeycomb core of claim 7, wherein the fiber cloth is a glass fiber cloth and/or the fiber cloth has a thickness of 0.1-0.4mm.
9. The biobased polyamide honeycomb core according to claim 1, wherein the side walls of the hollow cylinder are provided with an inner layer, an intermediate layer and an outer layer, wherein the inner layer and the outer layer respectively comprise at least one layer of unidirectional prepreg tape, and the intermediate layer comprises at least one layer of fiber cloth.
10. The biobased polyamide honeycomb core of claim 1, wherein the outside of the side walls of the hollow cylinder is further provided with an adhesive layer.
11. The biobased polyamide honeycomb core according to claim 1, wherein when the cross section of the hollow cylinder is hexagonal or rounded hexagonal, the hollow cylinder is formed by six side walls enclosed, wherein an adhesive layer is provided on the outer surfaces of the six side walls or an adhesive layer is provided only on the outer sides of two side walls facing each other; or when the cross section of the hollow cylinder is elliptical or circular, the hollow cylinder is a cylinder or an elliptical cylinder, wherein the outer side of the side wall of the cylinder is provided with a bonding layer.
12. The biobased polyamide honeycomb core according to claim 10 or 11, wherein the material of the tie layer is selected from resins having a melting point of 60-220 ℃.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2023227241735 | 2023-10-11 | ||
| CN202322724173 | 2023-10-11 |
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| CN221923052U true CN221923052U (en) | 2024-10-29 |
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| CN202323420120.0U Active CN221923052U (en) | 2023-10-11 | 2023-12-15 | Bio-based polyamide honeycomb core |
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| CN (1) | CN221923052U (en) |
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