CN113211883B - Foam-filled aramid paper honeycomb wave-absorbing structure and preparation method thereof - Google Patents
Foam-filled aramid paper honeycomb wave-absorbing structure and preparation method thereof Download PDFInfo
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- CN113211883B CN113211883B CN202110606758.XA CN202110606758A CN113211883B CN 113211883 B CN113211883 B CN 113211883B CN 202110606758 A CN202110606758 A CN 202110606758A CN 113211883 B CN113211883 B CN 113211883B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
- B31D3/00—Making articles of cellular structure, e.g. insulating board
- B31D3/02—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section
- B31D3/0223—Making honeycomb cores, e.g. by piling a plurality of web sections or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
- B31D3/00—Making articles of cellular structure, e.g. insulating board
- B31D3/02—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section
- B31D3/0207—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section of particular shape or construction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
- B31D3/00—Making articles of cellular structure, e.g. insulating board
- B31D3/02—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section
- B31D3/0292—Making articles of cellular structure, e.g. insulating board honeycombed structures, i.e. the cells having an essentially hexagonal section involving auxiliary operations, e.g. expanding, moistening, glue-applying, joining, controlling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H3/00—Camouflage, i.e. means or methods for concealment or disguise
- F41H3/02—Flexible, e.g. fabric covers, e.g. screens, nets characterised by their material or structure
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- Engineering & Computer Science (AREA)
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the technical field of electronic materials, in particular to a foam-filled aramid paper honeycomb wave-absorbing structure and a preparation method thereof. According to the invention, the T-direction, W-direction and L-direction mechanical properties of the honeycomb structure are improved by filling the modified polyurethane foam into the aramid paper honeycomb wave-absorbing structure. In addition, the structure has strong plasticity, and magnetic materials such as carbon black, carbon nano tubes, ferrite and the like can be added in the foaming process so as to meet the requirement of optimizing the wave-absorbing performance of the honeycomb wave-absorbing structure in the T direction and ensure the popularization and the application of the structure in the fields of electromagnetic compatibility, low detectable technology and the like. The modified polyurethane foaming agent foam hardly influences the wave absorbing performance of the original honeycomb wave absorbing structure; the preparation method is simple to operate, simple in used equipment, short in preparation flow and strong in operability. Still further provide the whole graphical design scheme of honeycomb holes who fills the foam to realize secondary structural design, reach lightweight or/and mechanical properties's promotion.
Description
Technical Field
The invention relates to the technical field of electronic materials, in particular to a foam-filled aramid paper honeycomb wave-absorbing structure and a preparation method thereof.
Background
The structural stealth material is a bifunctional composite material developed on the basis of an advanced composite material, can be stealthed and borne, can form various parts with complex shapes, such as wings, empennages, air inlet channels and the like, does not increase the extra mass of an airplane, is favorable for widening an absorption band, and is a main development direction of the modern stealth material.
The aramid fiber paper honeycomb composite material is an important weight-reducing material in the fields of aviation, aerospace, transportation and the like. The aramid fiber paper honeycomb wave-absorbing structure has the functions of light weight, high rigidity, high strength, wave absorption and the like, is widely concerned in the technical field of electromagnetic compatibility and low detectability, is a typical structural design scheme with light weight, high strength and high rigidity, and organically combines the high strength and high modulus of the panel with the low density and high rigidity of the sandwich. However, the aramid paper honeycomb has excellent mechanical properties such as high rigidity and high strength only in the T direction, but has poor mechanical properties in the W direction and the L direction (see fig. 1), and is generally 1 to 2 orders of magnitude lower than the T direction. In the actual use process, the aramid fiber paper honeycomb is not always stressed axially, the electromagnetic performance in the T direction is guaranteed by considering the actual application, and meanwhile, the mechanical properties in the W direction and the L direction of the honeycomb structure are improved to become a core problem to be solved urgently for the aramid fiber paper honeycomb wave-absorbing structure.
The existing method for enhancing the mechanical strength of the honeycomb structure mainly aims at the T direction of the honeycomb structure and does not relate to the improvement of the mechanical properties of the W direction and the L direction, such as: 1. for example, a plurality of honeycombs are connected in series (namely, the height of the honeycomb holes is increased) to improve the energy absorption effect, but the problems of inconsistent deformation sequence and the like often occur; 2. the honeycomb node structure is changed through the bionic design so as to improve the mechanical strength of the honeycomb structure, however, the structure is complex in design and high in manufacturing cost, and the process is not suitable for a paper honeycomb structure; 3. individual holes are filled in the honeycomb holes through the metal pipe or the carbon fiber pipe structure, the bearing mode of the honeycomb structure is changed, however, the filling of the metal pipe can deteriorate the wave absorbing performance of the whole structure, and the two filling modes can lead to corresponding process cost increase. 4. In addition, reinforcing methods such as a honeycomb wall reinforcement structure and a heterosexual structure are adopted, but the methods also have the problems of high operation difficulty, complex preparation process and the like.
Disclosure of Invention
Aiming at the problems or the defects, the invention provides a foam-filled aramid paper honeycomb wave-absorbing structure and a preparation method thereof, aiming at solving the problem that the existing aramid paper honeycomb wave-absorbing structure has poor mechanical properties in the T direction, the W direction and the L direction.
A foam-filled aramid fiber paper honeycomb wave-absorbing structure comprises aramid fiber paper honeycombs and foam; the foam is filled in preset honeycomb holes of the aramid paper honeycomb, and the foam material adopts 4,4' diphenylmethane diisocyanate: epoxy resin and matched curing agent: the foaming agent is prepared by foaming a polyurethane foaming agent black material and a polyurethane foaming agent white material according to the mass percentage of 7-10.
Furthermore, the preset honeycomb holes are not completely filled, and the honeycomb holes filled with foam form a graphical design relative to the plane graph of the whole target aramid fiber paper honeycomb wave-absorbing structure. Such as regular polygons or periodic structures, to achieve further weight reduction or/and dual structural optimization of mechanical properties.
Further, the foam is filled with magnetic materials, such as carbon black, carbon nanotubes or/and ferrite. The requirements of the honeycomb wave-absorbing structure on the T-direction wave-absorbing performance are met in an optimized mode, and the popularization and application of the honeycomb wave-absorbing structure in the fields of electromagnetic compatibility, low detectable technology and the like are guaranteed.
The preparation method of the foam-filled aramid paper honeycomb wave-absorbing structure comprises the following steps:
step 3, adding the polyurethane foaming agent black material and the polyurethane foaming agent white material prepared in the step 1 into a container containing the mixture 1, and uniformly mixing the materials to obtain a mixture 2;
and 4, foaming the mixture 2 obtained in the step 3 at the temperature of 60-80 ℃ to fill the preset honeycomb holes of the aramid fiber paper honeycomb wave-absorbing structure, and naturally cooling to room temperature after the mixture is completely solidified.
Further, the mixture 2 obtained in the step 3 is added with magnetic materials such as carbon black, carbon nanotubes, ferrite and the like according to needs, so as to meet the requirement of optimizing the wave-absorbing performance of the honeycomb wave-absorbing structure in the T direction and ensure the popularization and application of the honeycomb wave-absorbing structure in the fields of electromagnetic compatibility, low detectable technology and the like.
Further, the specific manner of filling the mixture 2 into the aramid fiber paper honeycomb wave-absorbing structure by foaming in the step 4 is as follows: by configuring a mould matched with the aramid fiber paper honeycomb wave-absorbing structure, the mode that the aramid fiber paper honeycomb wave-absorbing structure is firstly placed, then the mixture 2 is added for foaming, or the mixture 2 is firstly added and then the aramid fiber paper honeycomb wave-absorbing structure is immersed is adopted.
Furthermore, the foaming filling mold in the step 4 is used after being preheated at 50-90 ℃, and the preheating of the mold is beneficial to reducing the temperature difference between the foaming mixture and the inside of the furnace and is beneficial to the foaming process.
Furthermore, when the aramid fiber paper honeycomb wave-absorbing structure is not completely filled and foamed, the aramid fiber paper honeycomb wave-absorbing structure is firstly placed in the foaming filling mode in the step 4, and then the mixture 2 is added for foaming, so that the process implementation is facilitated.
According to the invention, the T-direction, W-direction and L-direction mechanical properties of the honeycomb structure are improved by filling the modified polyurethane foam into the aramid paper honeycomb wave-absorbing structure. In addition, the structure has strong plasticity, and magnetic materials such as carbon black, carbon nano tubes, ferrite and the like can be added in the foaming process so as to meet the requirement of optimizing the wave-absorbing performance of the honeycomb wave-absorbing structure in the T direction and ensure the popularization and the application of the structure in the fields of electromagnetic compatibility, low detectable technology and the like. In the L direction of the aramid paper honeycomb composite structure, the average value of the platform force is increased from 95N (figure 2, honeycomb-L) to 1100N (figure 3, honeyy/foam-L); in the W direction of the aramid paper honeycomb composite structure, the average platform force is increased from 110N (FIG. 2, honeycomb-W) to 890N (FIG. 3, honeyy/foam-W). On the basis of the original aramid paper honeycomb structure, the mechanical property in the L direction is improved by over 1100 percent, and the mechanical property in the W direction is improved by over 800 percent. The modified polyurethane foaming agent foam hardly influences the wave absorbing performance of the original honeycomb wave absorbing structure; the preparation method is simple to operate, simple in used equipment, short in preparation flow and strong in operability. Still further provide the whole graphical design scheme of honeycomb holes who fills the foam to realize secondary structural design, reach lightweight or/and mechanical properties's promotion.
Drawings
FIG. 1 is a honeycomb structure of aramid paper;
FIG. 2 is a force-displacement curve of the W-direction and L-direction compression process of the honeycomb structure of the aramid paper of the example;
FIG. 3 is a force-displacement curve of the modified polyurethane foam filled aramid fiber paper honeycomb wave-absorbing structure in the lateral compression process of the embodiment;
FIG. 4 is a pictorial representation of an example modified polyurethane foam structure;
FIG. 5 is a cross-sectional view of an embodiment of a modified polyurethane foam filled aramid fiber paper honeycomb wave-absorbing structure;
FIG. 6 is a cross-sectional view of an embodiment of a modified polyurethane foam doped carbon black filled aramid fiber paper honeycomb wave-absorbing structure;
FIG. 7 is a force-displacement curve of the modified polyurethane foam doped carbon black filled honeycomb wave-absorbing structure in the lateral compression process of the embodiment;
FIG. 8 is a front and back reflectivity curve of the modified polyurethane foam filled aramid fiber paper honeycomb wave-absorbing structure of the embodiment;
FIG. 9 is a reflectance curve before and after the modified polyurethane foam is doped with carbon black to fill the aramid fiber paper honeycomb wave-absorbing structure in the embodiment.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
Example 1: modified polyurethane foam fills aramid fiber paper honeycomb wave-absorbing structure.
140g of 4,4' diphenylmethane diisocyanate is weighed and poured into a beaker, 10g of epoxy resin and 10g of epoxy resin curing agent are respectively weighed according to the mass ratio of 7. Weighing 35g of polyurethane foam black material and 35g of polyurethane white material, injecting the polyurethane foam black material and the polyurethane white material into the mixture 1 together, setting the stirring speed to be 300r/min and the stirring time to be 180s at room temperature and 25 ℃, starting stirring after the parameters are set, and obtaining a mixture 2 after the set time. The materials used for the modified polyurethane foam are polyurethane foaming agent black material and polyurethane foaming agent white material produced by Fuzhou Ming worker and trade company, 4' diphenylmethane diisocyanate, epoxy resin and curing agent matched with the epoxy resin.
And (3) injecting the mixture 2 into a mold preheated to 80 ℃, standing for 2min, slightly pressing a prepared aramid fiber paper honeycomb structure into the mold, then putting the mold into a constant-temperature furnace, setting the temperature to 80 ℃, curing the modified polyurethane foam at the temperature for 90min, closing the constant-temperature furnace to slowly cool to the room temperature after the aramid fiber paper honeycomb structure is completely filled with the modified polyurethane foam, and taking out the obtained modified polyurethane foam filled aramid fiber paper honeycomb wave-absorbing structure.
Through tests, the density of the modified polyurethane foam filled honeycomb wave-absorbing structure in the embodiment is 190kg/m 3 . A physical diagram of the modified polyurethane foam filled aramid fiber paper honeycomb wave-absorbing structure after treatment is shown in fig. 5, lateral mechanical properties of the wave-absorbing structure under a compression condition are shown in fig. 3, and reflectivity of the modified polyurethane foam filled aramid fiber paper honeycomb wave-absorbing structure prepared in the embodiment is compared with reflectivity of an original honeycomb wave-absorbing structure and is shown in fig. 8.
Example 2: the modified polyurethane wave-absorbing foam is doped with carbon black filled aramid paper honeycomb wave-absorbing structure.
Other steps and conditions of this example are the same as those of example 1, and the difference is that: after obtaining mixture 1, 35g of a polyurethane foam black and 35g of a polyurethane white were weighed and poured together into mixture 1 to obtain mixture 2, which was not stirred. Then, 5% by weight of carbon black in the mixture 2 was weighed and poured into the mixture 2, and stirred according to the stirring parameters of the mixture 1, and after stirring, the mixture was left to stand for 2min, and the honeycomb structure prepared in advance was gently pressed into the mixture 3. The subsequent steps are the same, and the modified polyurethane foam filled aramid paper honeycomb wave-absorbing structure doped with the carbon black is obtained.
The modified polyurethane foam filling of this example incorporating carbon black was testedThe density of the aramid fiber paper honeycomb wave-absorbing structure is 160kg/m 3 . A physical diagram of the modified polyurethane foam filled aramid paper honeycomb wave-absorbing structure doped with carbon black after treatment is shown in fig. 6, fig. 7 is the lateral mechanical properties of the wave-absorbing structure in the W and L directions under a compression condition, and fig. 9 is a reflectivity comparison before and after carbon black is added with the mass fraction of 15%. The density of the honeycomb wave-absorbing structure is increased to a certain extent from the original 65kg/m 3 Increased to 160kg/m 3 。
In the L direction of the aramid paper honeycomb composite structure, the average value of the platform force is increased from 95N (figure 2, honeycomb-L) to 1100N (figure 3, honeyy/foam-L); in the W direction of the aramid paper honeycomb composite structure, the average platform force is increased from 110N (FIG. 2, honeycomb-W) to 890N (FIG. 3, honeyy/foam-W). On the basis of the original aramid paper honeycomb structure, the mechanical property in the L direction is improved by over 1100 percent, and the mechanical property in the W direction is improved by over 800 percent.
Through the two embodiments, the invention can be seen that the modified polyurethane foam is firstly modified (so as to avoid the foam from deteriorating the wave-absorbing performance), and then the foam and the aramid fiber paper honeycomb porous structure are compounded to form the modified polyurethane foam filled aramid fiber paper honeycomb wave-absorbing structure with excellent mechanical properties. The preparation process is simple, and the mechanical property of the aramid fiber paper honeycomb structure is positively influenced by compounding the aramid fiber paper honeycomb structure with the honeycomb porous light structure. In addition, the structure has strong plasticity, and can be conveniently doped with fillers of magnetic materials (such as carbon black, carbon fibers, carbon nanotubes and the like) so as to meet the use requirements in different scenes.
Claims (9)
1. The utility model provides a foam filling aramid paper honeycomb absorbent structure which characterized in that: comprises aramid paper honeycombs and foams; the foam is filled in preset honeycomb holes of the aramid paper honeycomb, and the foam material adopts 4,4' diphenylmethane diisocyanate: epoxy resin and matched curing agent: the foaming agent is prepared by foaming a polyurethane foaming agent black material and a polyurethane foaming agent white material according to the mass percentage of 7-10.
2. The foam-filled aramid paper honeycomb wave-absorbing structure as claimed in claim 1, wherein: the predetermined honeycomb holes are incompletely filled, and the honeycomb holes filled with the foam form a graphical design relative to a plane figure of the whole aramid fiber paper honeycomb wave-absorbing structure.
3. The foam-filled aramid paper honeycomb wave-absorbing structure as claimed in claim 2, characterized in that: the graphical design is a regular polygon or a periodic structure.
4. The foam-filled aramid paper honeycomb wave-absorbing structure as claimed in claim 1, wherein: the foam is also filled with a magnetic material.
5. The foam-filled aramid paper honeycomb wave-absorbing structure as claimed in claim 4, wherein: the magnetic material is carbon black, carbon nano-tubes or/and ferrite.
6. The preparation method of the foam-filled aramid paper honeycomb wave-absorbing structure as claimed in claim 1, comprising the following steps:
step 1, mixing a foaming raw material 4,4' diphenylmethane diisocyanate: epoxy resin and matched curing agent: preparing a polyurethane foaming agent black material and a polyurethane foaming agent white material according to the mass percentage of 8-10;
step 2, uniformly mixing the 4,4' -diphenylmethane diisocyanate prepared in the step 1, epoxy resin and a matched curing agent in a container to obtain a mixture 1;
step 3, adding the polyurethane foaming agent black material and the polyurethane foaming agent white material prepared in the step 1 into a container containing the mixture 1, and uniformly mixing the materials to obtain a mixture 2;
and 4, foaming the mixture 2 obtained in the step 3 at 80-120 ℃ to fill the preset honeycomb holes of the aramid fiber paper honeycomb wave-absorbing structure, and naturally cooling to room temperature after the mixture is completely solidified.
7. The preparation method of the foam-filled aramid paper honeycomb wave-absorbing structure as claimed in claim 6, characterized in that:
the specific mode of foaming and filling the mixture 2 to the target aramid fiber paper honeycomb wave-absorbing structure in the step 4 is as follows: by configuring a mold matched with a target aramid fiber paper honeycomb wave-absorbing structure, the mode that the aramid fiber paper honeycomb wave-absorbing structure is firstly placed, then the mixture 2 is added for foaming, or the mixture 2 is firstly added and then the aramid fiber paper honeycomb wave-absorbing structure is immersed is adopted.
8. The preparation method of the foam-filled aramid paper honeycomb wave-absorbing structure as claimed in claim 7, characterized in that: the foaming filling mould in the step 4 is used after being preheated at 50-90 ℃.
9. The preparation method of the foam-filled aramid paper honeycomb wave-absorbing structure as claimed in claim 7, characterized in that: when the aramid fiber paper honeycomb wave-absorbing structure is selected to be incompletely filled and foamed, the aramid fiber paper honeycomb wave-absorbing structure is firstly placed in the foaming filling mode in the step 4, and then the mixture 2 is added for foaming.
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