CN113232375A - Preparation method of honeycomb sandwich composite material - Google Patents
Preparation method of honeycomb sandwich composite material Download PDFInfo
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- CN113232375A CN113232375A CN202110346744.9A CN202110346744A CN113232375A CN 113232375 A CN113232375 A CN 113232375A CN 202110346744 A CN202110346744 A CN 202110346744A CN 113232375 A CN113232375 A CN 113232375A
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- 239000002131 composite material Substances 0.000 title claims abstract description 105
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 238000007598 dipping method Methods 0.000 claims abstract description 108
- 238000005470 impregnation Methods 0.000 claims abstract description 82
- 239000006096 absorbing agent Substances 0.000 claims abstract description 55
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 239000003292 glue Substances 0.000 claims abstract description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 80
- 229920005989 resin Polymers 0.000 claims description 66
- 239000011347 resin Substances 0.000 claims description 66
- 239000011358 absorbing material Substances 0.000 claims description 49
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims description 44
- 229920003192 poly(bis maleimide) Polymers 0.000 claims description 44
- 239000003085 diluting agent Substances 0.000 claims description 40
- 239000002270 dispersing agent Substances 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 39
- 229910000859 α-Fe Inorganic materials 0.000 claims description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 37
- 229910021389 graphene Inorganic materials 0.000 claims description 36
- 239000011248 coating agent Substances 0.000 claims description 25
- 238000005520 cutting process Methods 0.000 claims description 24
- 238000000465 moulding Methods 0.000 claims description 24
- 239000002313 adhesive film Substances 0.000 claims description 14
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 7
- 239000011825 aerospace material Substances 0.000 abstract description 2
- 239000011162 core material Substances 0.000 description 174
- 239000000463 material Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000002086 nanomaterial Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
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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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
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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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/146—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers whereby one or more of the layers is 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
- B32B38/00—Ancillary operations in connection with laminating processes
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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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/08—Impregnating
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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
- B32B5/02—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 structural features of a fibrous or filamentary layer
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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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B2038/0052—Other operations not otherwise provided for
- B32B2038/0076—Curing, vulcanising, cross-linking
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/212—Electromagnetic interference shielding
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a preparation method of a honeycomb sandwich composite material, belonging to the technical field of aerospace material preparation, and being characterized by comprising the following steps: a. preparing a first impregnation solution; b. placing the first honeycomb core with the rectangular cross section in a dipping tank for fully dipping; c. preparing a second impregnation solution; d. placing the second honeycomb core with the trapezoidal section in a dipping tank for fully dipping; e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core; f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material. According to the invention, two honeycomb cores containing different wave absorber coatings are obtained by wet impregnation, a composite honeycomb sandwich structure is obtained by reasonable design, and then the composite honeycomb sandwich structure is bonded and cured with a panel, so that the wave absorbing bandwidth of the whole honeycomb sandwich composite material can be effectively improved, and the absorption effect of electromagnetic waves is enhanced.
Description
Technical Field
The invention relates to the technical field of aerospace material preparation, in particular to a preparation method of a honeycomb sandwich composite material.
Background
The development of modern military investigation technology puts higher requirements on the stealth performance of the airplane, so that the vigorous development of light and broadband radar stealth wave-absorbing materials becomes an important subject of aerospace manufacturing technology.
The radar stealth wave-absorbing material has the basic working principle that incident electromagnetic waves are limited in the material through the electromagnetic parameter adjustment design of the material, and electromagnetic energy is converted into heat energy through various loss mechanisms to be lost. The wave-absorbing material for aerospace can be generally divided into a coating type material and a structural type material, wherein the honeycomb core structure becomes an important development object of the structural type wave-absorbing material due to low density and large specific surface area. At present, the main method for improving the wave absorption performance of the honeycomb sandwich composite material is to dip and coat a high-loss wave absorber on the surface of the honeycomb sandwich composite material, and common wave absorbers are classified into dielectric loss type and magnetic loss type according to loss types. Dielectric loss type absorbers such as graphene or carbon nanotubes have a narrow absorption bandwidth and low absorption strength, and thus are difficult to be practically applied to aircraft manufacturing. The magnetic loss wave absorbing body such as ferrite is actually applied to the manufacturing of wave absorbing honeycomb materials due to good wave absorbing strength, but has the biggest defect that the density of the wave absorbing material is obviously improved, and the wave absorbing bandwidth needs to be further increased.
The thickness is also an important factor influencing the wave absorption performance of the honeycomb sandwich composite material, and the change of the electromagnetic parameters of the composite material can be realized by changing the thickness of the honeycomb core, so that the final wave absorption frequency range is influenced.
Chinese patent publication No. CN 103600517a, published as 2014, 02/26 discloses a method for preparing a honeycomb core with nanomaterial specific properties, comprising the steps of:
(1) gluing raw material paper, laminating, and hot-pressing by a hot press to prepare a honeycomb laminated block;
(2) stretching the honeycomb stacked block by a stretcher, and then shaping at high temperature in an oven to prepare a white honeycomb block;
(3) dipping and curing the white honeycomb blocks in a dipping machine;
the method is characterized in that: in the step (3), the white honeycomb block is subjected to at least one time of gum dipping, and the last gum dipping adopts a nano gum dipping solution, wherein the nano gum dipping solution comprises resin, an organic solvent and a nano material, the weight ratio of the resin to the organic solvent is 100: 150-.
The preparation method of the honeycomb core with the nanomaterial specificity disclosed by the patent document is simple in process and operation, no production equipment is required to be added, and the prepared honeycomb core not only inherits the excellent mechanical property of the traditional honeycomb core composite material, but also has the nanomaterial specificity. However, the absorption bandwidth and the electromagnetic wave absorption effect are not good enough.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of a honeycomb sandwich composite material, two honeycomb cores containing different wave absorber coatings are obtained by wet impregnation, a composite honeycomb sandwich structure is obtained by reasonable design, and then the composite honeycomb sandwich structure is bonded and cured with a panel, so that the wave-absorbing bandwidth of the whole honeycomb sandwich composite material can be effectively improved, and the absorption effect of electromagnetic waves is enhanced.
The invention is realized by the following technical scheme:
the preparation method of the honeycomb sandwich composite material is characterized by comprising the following steps of:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
In the step a, the impregnation liquid I is prepared from 100 parts by weight of bismaleimide resin, 2 parts by weight of dispersant, 4 parts by weight of nano graphene wave-absorbing material and 30 parts by weight of acetone diluent.
In the step b, the first honeycomb core with the rectangular cross section is placed in the dipping tank for full dipping, namely the dipping times are 3 times, and the dipping time is 20min each time.
In the step c, the second impregnation liquid is prepared from 100 parts by weight of bismaleimide resin, 30 parts by weight of nano ferrite wave-absorbing material, 30 parts by weight of acetone diluent and 2 parts by weight of dispersant.
In the step d, the second honeycomb core with the trapezoidal section is placed in the dipping tank to be fully dipped, namely the dipping times are 3 times, and the dipping time is 10min each time.
In the step e, the rectangular section honeycomb cores I are arranged longitudinally, the trapezoidal section honeycomb cores II are arranged transversely, and the adhesive film is a J-116 type high-temperature adhesive film.
In the step f, the upper panel and the lower panel are both quartz fiber and bismaleimide composite wave-transmitting panels.
In the step f, the curing is specifically performed under the conditions of 0.2 MPa and 180 ℃, and the curing time is 3 hours.
The beneficial effects of the invention are mainly shown in the following aspects:
1. a, preparing a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin into a uniform impregnation solution I; b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core; c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin; d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber; e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core; f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material. Compared with the prior art, the two honeycomb cores containing different wave absorber coatings are obtained by wet impregnation, the composite honeycomb sandwich structure is obtained by reasonable design, and then the composite honeycomb sandwich structure is bonded and cured with the panel, so that the wave absorbing bandwidth of the whole honeycomb sandwich composite material can be effectively improved, and the absorption effect of electromagnetic waves is enhanced.
2. According to the invention, the graphene wave-absorbing material is selected to replace part of ferrite wave-absorbing material to impregnate the honeycomb core, so that the wave-absorbing bandwidth of the composite material can be effectively improved while the wave-absorbing strength of the composite material is ensured, and the density of the composite material is lower than that of a honeycomb core material containing single ferrite.
3. According to the invention, the section of the ferrite honeycomb core II is in a trapezoid shape, so that electromagnetic waves which are not absorbed by the rectangular section honeycomb core I can be reflected to the wave absorbing wall of the rectangular section honeycomb core I again through the inclined surface, and the generation of transmission waves and surface secondary reflection waves is reduced; meanwhile, the existence of the inclined surface also causes linear change of the thickness of the honeycomb core with the rectangular section, which is also beneficial to widening the absorption bandwidth of the honeycomb material.
4. In the step e, the first rectangular-section honeycomb cores are arranged longitudinally, the second trapezoidal-section honeycomb cores are arranged transversely, the adhesive film is a J-116 type high-temperature adhesive film, the transverse arrangement of the second trapezoidal-section honeycomb cores is favorable for increasing the effective wall area of electromagnetic loss of the composite material, electromagnetic waves transmitted by the second trapezoidal-section honeycomb cores can be limited in the cavity of the core lattice for loss, the absorption effect of the electromagnetic waves is enhanced, and the longitudinal arrangement of the first rectangular-section honeycomb cores can effectively ensure the good mechanical strength of the composite material along the longitudinal direction.
Detailed Description
Example 1
A preparation method of the honeycomb sandwich composite material comprises the following steps:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
a. Preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin; b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core; c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin; d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber; e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core; f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material. Compared with the prior art, the two honeycomb cores containing different wave absorber coatings are obtained by wet impregnation, the composite honeycomb sandwich structure is obtained by reasonable design, and then the composite honeycomb sandwich structure is bonded and cured with the panel, so that the wave absorbing bandwidth of the whole honeycomb sandwich composite material can be effectively improved, and the absorption effect of electromagnetic waves is enhanced.
Example 2
A preparation method of the honeycomb sandwich composite material comprises the following steps:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
In the step a, the impregnation liquid I is prepared from 100 parts by weight of bismaleimide resin, 2 parts by weight of dispersant, 4 parts by weight of nano graphene wave-absorbing material and 30 parts by weight of acetone diluent.
Example 3
A preparation method of the honeycomb sandwich composite material comprises the following steps:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
In the step a, the impregnation liquid I is prepared from 100 parts by weight of bismaleimide resin, 2 parts by weight of dispersant, 4 parts by weight of nano graphene wave-absorbing material and 30 parts by weight of acetone diluent.
In the step b, the first honeycomb core with the rectangular cross section is placed in the dipping tank for full dipping, namely the dipping times are 3 times, and the dipping time is 20min each time.
The graphene wave-absorbing material is selected to replace part of ferrite wave-absorbing material to impregnate the honeycomb core, so that the wave-absorbing bandwidth of the composite material can be effectively improved while the wave-absorbing strength of the composite material is ensured, and the density of the composite material is lower than that of a honeycomb core material containing single ferrite.
Example 4
A preparation method of the honeycomb sandwich composite material comprises the following steps:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
In the step a, the impregnation liquid I is prepared from 100 parts by weight of bismaleimide resin, 2 parts by weight of dispersant, 4 parts by weight of nano graphene wave-absorbing material and 30 parts by weight of acetone diluent.
In the step b, the first honeycomb core with the rectangular cross section is placed in the dipping tank for full dipping, namely the dipping times are 3 times, and the dipping time is 20min each time.
In the step c, the second impregnation liquid is prepared from 100 parts by weight of bismaleimide resin, 30 parts by weight of nano ferrite wave-absorbing material, 30 parts by weight of acetone diluent and 2 parts by weight of dispersant.
Example 5
A preparation method of the honeycomb sandwich composite material comprises the following steps:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
In the step a, the impregnation liquid I is prepared from 100 parts by weight of bismaleimide resin, 2 parts by weight of dispersant, 4 parts by weight of nano graphene wave-absorbing material and 30 parts by weight of acetone diluent.
In the step b, the first honeycomb core with the rectangular cross section is placed in the dipping tank for full dipping, namely the dipping times are 3 times, and the dipping time is 20min each time.
In the step c, the second impregnation liquid is prepared from 100 parts by weight of bismaleimide resin, 30 parts by weight of nano ferrite wave-absorbing material, 30 parts by weight of acetone diluent and 2 parts by weight of dispersant.
In the step d, the second honeycomb core with the trapezoidal section is placed in the dipping tank to be fully dipped, namely the dipping times are 3 times, and the dipping time is 10min each time.
The cross section of the ferrite honeycomb core II is in a trapezoid shape, so that electromagnetic waves which are not absorbed by the rectangular cross section honeycomb core I can be reflected to the wave absorbing wall of the rectangular cross section honeycomb core I again through the inclined surface, and the generation of transmission waves and surface secondary reflection waves is reduced; meanwhile, the existence of the inclined surface also causes linear change of the thickness of the honeycomb core with the rectangular section, which is also beneficial to widening the absorption bandwidth of the honeycomb material.
Example 6
A preparation method of the honeycomb sandwich composite material comprises the following steps:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
In the step a, the impregnation liquid I is prepared from 100 parts by weight of bismaleimide resin, 2 parts by weight of dispersant, 4 parts by weight of nano graphene wave-absorbing material and 30 parts by weight of acetone diluent.
In the step b, the first honeycomb core with the rectangular cross section is placed in the dipping tank for full dipping, namely the dipping times are 3 times, and the dipping time is 20min each time.
In the step c, the second impregnation liquid is prepared from 100 parts by weight of bismaleimide resin, 30 parts by weight of nano ferrite wave-absorbing material, 30 parts by weight of acetone diluent and 2 parts by weight of dispersant.
In the step d, the second honeycomb core with the trapezoidal section is placed in the dipping tank to be fully dipped, namely the dipping times are 3 times, and the dipping time is 10min each time.
In the step e, the rectangular section honeycomb cores I are arranged longitudinally, the trapezoidal section honeycomb cores II are arranged transversely, and the adhesive film is a J-116 type high-temperature adhesive film.
Example 7
A preparation method of the honeycomb sandwich composite material comprises the following steps:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
In the step a, the impregnation liquid I is prepared from 100 parts by weight of bismaleimide resin, 2 parts by weight of dispersant, 4 parts by weight of nano graphene wave-absorbing material and 30 parts by weight of acetone diluent.
In the step b, the first honeycomb core with the rectangular cross section is placed in the dipping tank for full dipping, namely the dipping times are 3 times, and the dipping time is 20min each time.
In the step c, the second impregnation liquid is prepared from 100 parts by weight of bismaleimide resin, 30 parts by weight of nano ferrite wave-absorbing material, 30 parts by weight of acetone diluent and 2 parts by weight of dispersant.
In the step d, the second honeycomb core with the trapezoidal section is placed in the dipping tank to be fully dipped, namely the dipping times are 3 times, and the dipping time is 10min each time.
In the step e, the rectangular section honeycomb cores I are arranged longitudinally, the trapezoidal section honeycomb cores II are arranged transversely, and the adhesive film is a J-116 type high-temperature adhesive film.
In the step f, the upper panel and the lower panel are both quartz fiber and bismaleimide composite wave-transmitting panels.
Example 8
A preparation method of the honeycomb sandwich composite material comprises the following steps:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
In the step a, the impregnation liquid I is prepared from 100 parts by weight of bismaleimide resin, 2 parts by weight of dispersant, 4 parts by weight of nano graphene wave-absorbing material and 30 parts by weight of acetone diluent.
In the step b, the first honeycomb core with the rectangular cross section is placed in the dipping tank for full dipping, namely the dipping times are 3 times, and the dipping time is 20min each time.
In the step c, the second impregnation liquid is prepared from 100 parts by weight of bismaleimide resin, 30 parts by weight of nano ferrite wave-absorbing material, 30 parts by weight of acetone diluent and 2 parts by weight of dispersant.
In the step d, the second honeycomb core with the trapezoidal section is placed in the dipping tank to be fully dipped, namely the dipping times are 3 times, and the dipping time is 10min each time.
In the step e, the rectangular section honeycomb cores I are arranged longitudinally, the trapezoidal section honeycomb cores II are arranged transversely, and the adhesive film is a J-116 type high-temperature adhesive film.
In the step f, the upper panel and the lower panel are both quartz fiber and bismaleimide composite wave-transmitting panels.
In the step f, the curing is specifically performed under the conditions of 0.2 MPa and 180 ℃, and the curing time is 3 hours.
In the step e, the first rectangular-section honeycomb cores are arranged longitudinally, the second trapezoidal-section honeycomb cores are arranged transversely, the adhesive film is a J-116 type high-temperature adhesive film, the transverse arrangement of the second trapezoidal-section honeycomb cores is favorable for increasing the effective wall area of electromagnetic loss of the composite material, electromagnetic waves transmitted by the second trapezoidal-section honeycomb cores can be limited in the cavity of the core lattice for loss, the absorption effect of the electromagnetic waves is enhanced, and the longitudinal arrangement of the first rectangular-section honeycomb cores can effectively ensure the good mechanical strength of the composite material along the longitudinal direction.
Claims (8)
1. The preparation method of the honeycomb sandwich composite material is characterized by comprising the following steps of:
a. preparing a uniform impregnation liquid I from a nano graphene wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
b. slowly pouring the first impregnation liquid containing the wave absorber into an impregnation tank, cutting to obtain a first rectangular-section honeycomb core, fully impregnating the first rectangular-section honeycomb core in the impregnation tank, airing at room temperature, pre-curing, and finally curing and molding to wrap a resin coating containing the graphene wave absorber on the surface of the first rectangular-section honeycomb core;
c. preparing a uniform second impregnation solution from a nano ferrite wave-absorbing material, a dispersing agent, an acetone diluent and bismaleimide resin;
d. slowly pouring the dipping solution II containing the wave absorber into a dipping tank, cutting to obtain a second honeycomb core with a trapezoidal section, fully dipping the second honeycomb core with the trapezoidal section in the dipping tank, airing at room temperature, pre-curing, and finally curing and molding to enable the surface of the second honeycomb core with the trapezoidal section to be wrapped with a resin coating containing the ferrite wave absorber;
e. bonding the rectangular-section honeycomb core I and the trapezoidal-section honeycomb core II together by adopting a glue film to obtain a composite honeycomb core;
f. and adhering an upper panel to the upper surface of the composite honeycomb core, adhering a lower panel to the lower surface of the composite honeycomb core, and finally curing and cooling to room temperature to obtain the honeycomb sandwich composite material.
2. The preparation method of the honeycomb sandwich composite material according to claim 1, characterized in that: in the step a, the impregnation liquid I is prepared from 100 parts by weight of bismaleimide resin, 2 parts by weight of dispersant, 4 parts by weight of nano graphene wave-absorbing material and 30 parts by weight of acetone diluent.
3. The preparation method of the honeycomb sandwich composite material according to claim 1, characterized in that: in the step b, the first honeycomb core with the rectangular cross section is placed in the dipping tank for full dipping, namely the dipping times are 3 times, and the dipping time is 20min each time.
4. The preparation method of the honeycomb sandwich composite material according to claim 1, characterized in that: in the step c, the second impregnation liquid is prepared from 100 parts by weight of bismaleimide resin, 30 parts by weight of nano ferrite wave-absorbing material, 30 parts by weight of acetone diluent and 2 parts by weight of dispersant.
5. The preparation method of the honeycomb sandwich composite material according to claim 1, characterized in that: in the step d, the second honeycomb core with the trapezoidal section is placed in the dipping tank to be fully dipped, namely the dipping times are 3 times, and the dipping time is 10min each time.
6. The preparation method of the honeycomb sandwich composite material according to claim 1, characterized in that: in the step e, the rectangular section honeycomb cores I are arranged longitudinally, the trapezoidal section honeycomb cores II are arranged transversely, and the adhesive film is a J-116 type high-temperature adhesive film.
7. The preparation method of the honeycomb sandwich composite material according to claim 1, characterized in that: in the step f, the upper panel and the lower panel are both quartz fiber and bismaleimide composite wave-transmitting panels.
8. The preparation method of the honeycomb sandwich composite material according to claim 7, characterized in that: in the step f, the curing is specifically performed under the conditions of 0.2 MPa and 180 ℃, and the curing time is 3 hours.
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