CN107083019A - A kind of sound insulation composite material and preparation method thereof - Google Patents
A kind of sound insulation composite material and preparation method thereof Download PDFInfo
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- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/143—Halogen containing compounds
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
- C08J2203/142—Halogenated saturated hydrocarbons, e.g. H3C-CF3
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/18—Binary blends of expanding agents
- C08J2203/182—Binary blends of expanding agents of physical blowing agents, e.g. acetone and butane
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- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
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- C08L2203/00—Applications
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Abstract
A kind of sound insulation composite material, it is using Foamex system and three dimensional fibrous web as raw material, three dimensional fibrous web is subjected to curing molding in advance with polymeric system, the hollow sandwich inside configuration that Foamex system injects three dimensional fibrous web then is carried out into internal in-situ foaming composite curing forms.The present invention is by the way that the porosity of Foamex system, open-celled structure and aperture etc. are adjusted, and be combined with the three dimensional fibrous web with hollow sandwich structure, gained composite material exhibits go out excellent sound insulation value, and with preferably rigidity, toughness, and the cost of material that is related to is low, preparation method is simple, with important actual application value.
Description
Technical field
The invention belongs to field of functional materials, and in particular to a kind of sound insulation composite material and preparation method thereof.
Background technology
Current sound insulation sound-absorbing material application field is more and more extensive, and research of the people in terms of the sound-absorbing material that insulates against sound also is obtained
Great development, therefore composite also presents the one side of its advantage, meeting to the requirement in terms of sound insulation sound absorption
Meanwhile, composite can show good toughness, and therefore outstanding mechanics performance, grinds to sound insulation acoustic absorption composite material
Studying carefully has positive impetus to investigation of materials.
Because the sound insulation property of material follows quality theorem, in existing sound insulating material, such as sound-proof wall, sound insulationg board material
There is quality greatly in material, the features such as thickness is big can not arbitrarily cut size according to demand, and use scope in actual applications
Also it is narrow, and manufacturing process is complex, it is impossible to realize a large amount of quick productions.Japanese " Shi Jing business Co., Ltd. " research
Go out acoustic film of good performance, it there can be good sound insulation property, can also cut randomly according to demand completely, but this
The sound insulation film cost of manufacture of sample is higher.
The content of the invention
It is an object of the invention to provide a kind of sound insulation composite material, the sound insulation property of the material is excellent, and with preferable
Rigidity, toughness, and the cost of material being related to is low, preparation method simple, is adapted to popularization and application.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of sound insulation composite material, it is using Foamex system and three dimensional fibrous web as raw material, and the three-dimensional fiber is knitted
Thing includes upper surface, lower surface and hollow sandwich；Polymeric system is uniformly brushed in the upper surface of three dimensional fibrous web first
Curing molding is carried out to three dimensional fibrous web with lower surface, then Foamex system is injected to the three dimensional fabric of curing molding
In hollow sandwich, then heat up to foam in hollow sandwich into enforcement Foamex system and obtained with three dimensional fibrous web composite curing
The sound insulation composite material.
In such scheme, the gross thickness of the sound insulation composite material is 3-50mm.
In such scheme, the hollow sandwich between the upper and lower surface that the three-dimensional fiber is knitted is by continuous fibre core
Post, which connects, to be formed；Upper and lower surface thickness is 0.1~0.2mm, and the mesh aperture of upper and lower surface is 3-5mm, fine
The length of dimension is 20-100cm, a diameter of 5-30 μm.
In such scheme, the three dimensional fibrous web is carried out after curing molding, and the thickness of its upper and lower surface is
0.3-0.6mm。
In such scheme, the thickness of the hollow sandwich of the three dimensional fibrous web for carrying out curing molding is 2-48mm.
In such scheme, the porosity of the Foamex system is 58-79%, abscess aperture up to 500-600 μm, and
Distribution of cells is uniform.
In such scheme, each component and its shared parts by weight include in the Foamex system：It is 100 parts of resin, solid
20-60 parts of agent, A2-5 parts of foaming agent, B1-2.5 parts of foaming agent, 2-4 parts of foam stabiliser.
In such scheme, each component and its shared parts by weight include in the polymeric system：100 parts of resin, solidification
20-60 parts of agent, its system is roughly the same with Foamex system, and difference is to be not added with foaming agent and foam stabiliser.
In such scheme, the epoxy resin, polyurethane, phenolic resin or unsaturated polyester resin etc.；It can select poly- ammonia
Ester, bisphenol A type epoxy resin, bisphenol f type epoxy resin etc..
It is preferred that, the resin is bisphenol A-type E-51 epoxy resin.
In such scheme, the curing agent is the normal temperature or high-temperature curing agent for selected resin, and such as selected resin is
Curing agent can select modified polyamide or dicyandiamide etc. during bisphenol A type epoxy resin.
In such scheme, the foaming agent A can select the physics such as dichloromethane, trichlorotrifluoroethane or dicholorodifluoromethane
Foaming agent；Temperature difference very little during the curing gel of the blowing temperature of the physical blowing agent of use and epoxy resin, can be obtained
To stable loose structure.
It is preferred that, the foaming agent A is dichloromethane.
In such scheme, the foaming agent B is the foaming agent of high 10-20 DEG C than foaming agent A of blowing temperature, such as selected foaming
When agent A is dichloromethane, the optional pentamethylene of foaming agent B.It is used in combination, original single foaming agent can be obtained using two kinds of foaming agents
Obturator-type foam be changed into open-celled foam, to obtain the good open-celled foam material of insulating against sound.
It is preferred that, the foaming agent B is pentamethylene.
In such scheme, the foam stabiliser is Tween-20, silicone oil, Tween-80 or L-64 etc.；The stabilizer of use
Stomata obtained by foaming can be made fine and closely woven uniform, when system is in the low-viscosity stage, hole wall can be made stable, it is ensured that stomata grows into suitable
The degree of conjunction.
It is preferred that, the foam stabiliser selects silicone oil.
A kind of preparation method of above-mentioned novel sound composite, it comprises the following steps：
1) upper and lower surface first uniformly brushed polymeric system in three dimensional fibrous web is knitted to three-dimensional fiber
Thing carries out curing molding；
2) each component of resin expanded system is weighed by proportioning, each component and its shared parts by weight are：Resin is 100
Part, curing agent be 20-60 parts, foaming agent A be 2-5 parts, foaming agent B be 1-2.5 parts, foam stabiliser be 2-4 parts；
3) resin weighed, foaming agent A, foaming agent B, foam stabiliser are stirred mixed under conditions of 300-600r/min
Close uniform, then add curing agent and continue to stir, obtain resin expanded system；
4) injection of gained resin expanded system is through step 1) in the hollow sandwich of the three dimensional fibrous web of curing molding, then
40-50 DEG C of foaming 50-60min is warming up to, being continuously heating to 60-80 DEG C after resin expanded system starts to condense carries out secondary hair
50-60min is steeped, finally cooling, curing molding, produce the sound insulation composite material.
In such scheme, the addition of the resin expanded system is simultaneously former to inject three dimensional fibrous web hollow sandwich structure
The space that hollow sandwich is filled up in position foaming is defined.
In such scheme, the injection rate of the resin expanded system can select as 1.5-3 times of three dimensional fibrous web quality.
The present invention principle be：
The present invention is by the way that the porosity of foam system, foam structure, aperture etc. are adjusted, gained Foamex system
Abscess-size up to 500-600 μm, adjustable porosity to 58-79%, abscess is in open-celled structure and is evenly distributed.By above-mentioned tree
Fat foaming system injection three dimensional fibrous web hollow sandwich in, then foam in place, solidification obtain the novel sound be combined
Material, resulting materials show excellent sound insulation and mechanical property：During gained sound insulating material surface that sound wave is incoming, sound wave is first
By the fiber reflection of fabric once, remainder enters inside foamed resin material, simultaneously because the interior bone of foam
The damping effect of generation and be gradually consumed, while being also coated on the fibre core in Foamex system in foam inside
Post, sound wave runs into fiber stem in open celled foam and may proceed to occur refraction and scatter, and sound wave is again by foam inside through hole
Damping action is consumed, internal fiber and foam the through hole synergy of such three dimensional fabric, significantly improves the sound insulation of resulting materials
Performance；Simultaneously as fiber has good bearing capacity, and three dimensional fabric inside configuration fiber is connected with each other constantly, works as material
When material receives load, Foamex matrix is received and transmits load, and load is transmitted in material internal, it is not easy to produce stress collection
In, the fiber being broken individually gained composite material exhibits because the effect of Foamex matrix is so that crackle can not spread
Excellent mechanical property, is adapted to popularization and application.
Compared with prior art, the beneficial effects of the invention are as follows：
1) present invention is using three dimensional fibrous web as reinforcement, and with traditional foam layer, honeycomb interlayer etc. is compared, its
Structure is more stablized, and is not in the phenomenon that surface layer is separated with sandwich layer；Compared with the fiber reinforcing texture composite of two dimension, three
The failure procedure for tieing up structure is globality that is gradual and can preferably keeping original structure.
2) present invention prepares Foamex system using two kinds of foaming agent first, and in three dimensional fibrous web
Foam in place is carried out in empty sandwich to be combined, and obtains the open-celled foam filled composite system for possessing good sound insulation property, profit
With few cost, the sound insulation property of material is substantially increased.
3) sound insulation property of present invention gained novel sound composite is excellent, and with preferably rigidity, toughness, and relate to
And cost of material is low, preparation method simple, be adapted to popularization and application.
Brief description of the drawings
Fig. 1 is the cross-sectional view of the products therefrom of the embodiment of the present invention 1, in figure, and 1 knits for the three-dimensional fiber after solidification
Object plane layer, 2 be fiber stem, and 3 be resin expanded system.
Fig. 2 is sound insulation property of the products therefrom of the embodiment of the present invention 1 under 125Hz-6000Hz frequencies and the gained of comparative example 1
With the sound insulation value comparison diagram of size foaming sound-proof material.
Fig. 3 is sound insulation property of the products therefrom of the embodiment of the present invention 2 under 125Hz-6000Hz frequencies and the gained of comparative example 2
With the sound insulation value comparison diagram of size foaming sound-proof material.
Fig. 4 is sound insulation property of the products therefrom of the embodiment of the present invention 3 under 125Hz-6000Hz frequencies and the gained of comparative example 3
With the sound insulation value comparison diagram of size foaming sound-proof material.
Embodiment
Further the present invention will be described with reference to the accompanying drawings and examples, but present disclosure is not limited solely to
The following examples.
In following examples, the resin used is modified polyamide for bisphenol A-type E51 epoxy resin, curing agent；Before use
By bisphenol A-type E51 epoxy resin and curing agent modified polyamide cure, determine that its solidification temperature scope is 40~80 by DSC
℃。
In following examples, the foaming agent A used is dichloromethane, and foaming agent B is pentamethylene, and stabilizer is silicone oil.
The three dimensional fibrous web used is commercially available three-dimensional glass fabric, and it is formed by glass fibre continuous weaving
In the three-dimensional braid of hollow core structures, comprising upper surface, lower surface and hollow sandwich, by between upper and lower surface
Continuous fiber stem in empty interlayer, which connects, to be formed；Surface layer (upper and lower surface) thickness of the dimension fabric is 0.1
~0.2mm, the mesh aperture of upper and lower surface is 4mm, and the length of fiber is 20~100cm, and the height of fiber stem is
4.2mm, a diameter of 5~30 μm；Three dimensional fibrous web is brushed with polymeric system and carried out with upper and lower surface on obtained by curing molding
Surface, the thickness of lower surface are 0.3~0.4mm.
Embodiment 1
A kind of sound insulation composite material, its preparation method comprises the following steps：
1) three dimensional fibrous web is brushed with polymeric system first and carries out curing molding with upper and lower surface, formation has
The three dimensional fibrous web of hollow sandwich structure, the polymeric system is by the resin of 100 parts by weight and the curing agent of 30 parts by weight
It is well mixed to form；
2) each component of resin expanded system is weighed by proportioning, each component and its shared parts by weight are：100 parts of resin,
30 parts of curing agent, A2 parts of foaming agent, B1 parts of foaming agent, 2 parts of stabilizer；
3) resin weighed, foaming agent A, foaming agent B, foam stabiliser are stirred mixed under conditions of 300-600r/min
Close uniform, then add curing agent and continue to stir, obtain resin expanded system；
4) three-dimensional of the resin expanded system injection of gained (injection rate is 1.5 times of three dimensional fibrous web quality) curing molding
In the hollow sandwich structure of fabric, 40 DEG C of foaming 60min are then heated to, treat that resin expanded system starts to condense follow-up temperature of continuing rising
To 60 DEG C of progress second time of foaming, foam 60min, and then curing molding, produces the novel sound composite (structural representation
See Fig. 1), the gross thickness of gained composite is 5mm, wherein the porosity of the resin expanded system of foaming gained is 58%, abscess
Aperture is 500~600 μm.
Comparative example 1
A kind of foaming sound-proof material, its formula is roughly the same with the resin expanded system in embodiment 1, and difference is not
Foaming agent B is added, and second time of foaming step need not be carried out in preparation method.
Foaming sound-proof material obtained by the present embodiment products therefrom and comparative example is subjected to mechanical property and sound insulation value respectively
Test, as a result shows：Products therefrom of the present invention sound transmission loss in 125Hz reaches as high as 48Hz, and average sound transmission loss also reaches
44.54Hz (see Fig. 2), significantly larger than non-complex three-dimensional fabric foaming sound-proof system；And bending strength is reachable
135.86MPa, relative contrast's example 1 improves 312.4%.
Embodiment 2
A kind of novel sound composite, its preparation method comprises the following steps：
1) three dimensional fibrous web is brushed with polymeric system first and carries out curing molding with upper and lower surface, formation has
The three dimensional fibrous web of hollow sandwich structure, the polymeric system is by the resin of 100 parts by weight and the curing agent of 30 parts by weight
It is well mixed to form；
2) each component of resin expanded system is weighed by proportioning, each component and its shared parts by weight are：100 parts of resin,
30 parts of curing agent, 3 parts of foaming agent A, 1.5 parts of foaming agent B, 3 parts of stabilizer；
3) resin weighed, foaming agent A, foaming agent B, foam stabiliser are stirred mixed under conditions of 300-600r/min
Close uniform, then add curing agent and continue to stir, obtain resin expanded system；
4) three-dimensional of the resin expanded system injection of gained (injection rate is 1.5 times of three dimensional fibrous web quality) curing molding
In the hollow sandwich structure of fabric, 40 DEG C of foaming 60min are then heated to, treat that resin expanded system starts to condense follow-up temperature of continuing rising
Second time of foaming foaming 60min is carried out to 60 DEG C, then curing molding, produces the novel sound composite, gained composite wood
The gross thickness of material is 5mm, wherein the porosity of the resin expanded system of foaming gained is 68%, abscess aperture is 500~600 μm.
Comparative example 2
A kind of foaming sound-proof material, its formula is roughly the same with the resin expanded system in embodiment 2, and difference is not
Foaming agent B is added, and second time of foaming step need not be carried out in preparation method.
The present embodiment products therefrom and the gained foaming sound-proof material of comparative example 2 are subjected to mechanical property and sound insulation value respectively
Test, as a result shows：Products therefrom of the present invention sound transmission loss in 125Hz reaches as high as 53Hz, and average sound transmission loss also reaches
(50.58Hz see Fig. 3), significantly larger than non-complex three-dimensional fabric Foamex system；And bending strength is reachable
131.34MPa, relative contrast's example 2 improves 298.6%.
Embodiment 3
A kind of novel sound composite, its preparation method comprises the following steps：
1) three dimensional fibrous web is brushed with polymeric system first and carries out curing molding with upper and lower surface, formation has
The three dimensional fibrous web of hollow sandwich structure, the polymeric system is by the resin of 100 parts by weight and the curing agent of 30 parts by weight
It is well mixed to form；
2) each component of resin expanded system is weighed by proportioning, each component and its shared parts by weight are：100 parts of resin,
30 parts of curing agent, A4 parts of foaming agent, 2 parts of foaming agent B, 4 parts of stabilizer；
3) resin weighed, foaming agent A, foaming agent B, foam stabiliser are stirred mixed under conditions of 300-600r/min
Close uniform, then add curing agent and continue to stir, obtain resin expanded system；
4) three-dimensional of the resin expanded system injection of gained (injection rate is 1.5 times of three dimensional fibrous web quality) curing molding
In the hollow sandwich structure of fabric, 40 DEG C of foaming 60min are then heated to, treat that resin expanded system starts to condense follow-up temperature of continuing rising
Second time of foaming foaming 60min is carried out to 60 DEG C, then curing molding, produces the novel sound composite, gained composite wood
The gross thickness of material is 5mm, wherein the porosity of the resin expanded system of foaming gained is 79%, abscess aperture is 500~600 μm.
Comparative example 3
A kind of foaming sound-proof material, its formula is roughly the same with the resin expanded system in embodiment 3, and difference is not
Foaming agent B is added, and second time of foaming step need not be carried out in preparation method.
The present embodiment products therefrom and the gained foaming sound-proof material of comparative example 3 are subjected to mechanical property and sound insulation value respectively
Test, as a result shows：Products therefrom of the present invention sound transmission loss in 125Hz reaches as high as 45.08Hz, and average sound transmission loss also reaches
42.17Hz (see Fig. 4), significantly larger than non-complex three-dimensional fabric Foamex system；And bending strength is reachable
128.82MPa, relative contrast's example 3 improves 285.0%.
Above-described embodiment is just for the sake of clearly demonstrating done example, and the not limitation to embodiment.For
For those of ordinary skill in the art, can also make on the basis of the above description other it is various forms of change or
Change, there is no necessity and possibility to exhaust all the enbodiments, therefore the obvious changes or variations amplified
Within the protection domain of the invention.
Claims (10)
1. a kind of sound insulation composite material, it is characterised in that it is using Foamex system and three dimensional fibrous web as raw material, described three
Tie up fabric and include upper surface, lower surface and hollow sandwich；Polymeric system is uniformly brushed in three dimensional fibrous web first
Upper and lower surface curing molding is carried out to three dimensional fibrous web, it is then that the injection of the Foamex system of preparation is cured
In the hollow sandwich of the three dimensional fibrous web of shaping, then heating up makes Foamex system be foamed in hollow sandwich and fine with three-dimensional
Dimensional fabric is compound, solidification obtains the sound insulation composite material.
2. sound insulation composite material according to claim 1, it is characterised in that the thickness of the sound insulation composite material is 3-
50mm。
3. sound insulation composite material according to claim 1, it is characterised in that the upper surface of the three dimensional fibrous web is with
Hollow sandwich between surface is connected by continuous fiber stem to be formed；Upper and lower surface thickness is 0.1-0.2mm, upper table
Face and the fibrage mesh aperture of lower surface are 3-5mm, and the length of fiber is 20-100cm, a diameter of 5-30 μm.
4. sound insulation composite material according to claim 1, it is characterised in that the porosity of the Foamex system is
58-79%, abscess aperture is 500-600 μm.
5. sound insulation composite material according to claim 1, it is characterised in that in the Foamex system each component and its
Shared parts by weight include：100 parts of resin, 20-60 parts of curing agent, A2-5 parts of foaming agent, B1-2.5 parts of foaming agent, foam stabilization
2-4 parts of agent.
6. sound insulation composite material according to claim 2, it is characterised in that each component and its institute in the polymeric system
Accounting for parts by weight includes：100 parts of resin, 20-60 parts of curing agent.
7. the sound insulation composite material according to claim 5 or 6, it is characterised in that the resin is epoxy resin, poly- ammonia
Ester, phenolic resin or unsaturated polyester resin.
8. sound insulation composite material according to claim 4, it is characterised in that the foaming agent A is dichloromethane, trichlorine three
Fluoromethane or dicholorodifluoromethane；The foaming agent B is pentamethylene, ethlyene dichloride or fluorohydrocarbon.
9. sound insulation composite material according to claim 4, it is characterised in that the foam stabiliser is Tween-20, silicon
Oil, Tween-80 or L-64.
10. the preparation method of any one of the claim 1~9 novel sound composite, it is characterised in that including following step
Suddenly：
1) upper and lower surface first uniformly brushed polymeric system in three dimensional fibrous web is entered to three dimensional fibrous web
Row curing molding；
2) each component of resin expanded system is weighed by proportioning, each component and its shared parts by weight include：It is 100 parts of resin, solid
20-60 parts of agent, A2-5 parts of foaming agent, B1-2.5 parts of foaming agent, 2-4 parts of foam stabiliser；
3) resin weighed, foaming agent A, foaming agent B, foam stabiliser are mixed equal with 300-600r/min stir speed (S.S.)
It is even, then add curing agent and continue to stir, obtain resin expanded system；
4) by the injection of gained resin expanded system through step 1) in the hollow sandwich of the three dimensional fibrous web of curing molding, Ran Housheng
Temperature is continuously heating to 60-80 DEG C of progress second time of foaming to 40-50 DEG C of foaming 50-60min after resin expanded system starts to condense
50-60min, finally cooling, curing molding, produce the sound insulation composite material.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110065287A (en) * | 2019-05-27 | 2019-07-30 | 重庆理工大学 | A kind of bubble core phase transformation sandwich structure composite material and preparation method thereof |
| CN110978672A (en) * | 2019-12-17 | 2020-04-10 | 南京工程学院 | Integrally formed sandwich structure and process |
| CN111349312A (en) * | 2018-12-24 | 2020-06-30 | 湖南莱科新材料科技有限公司 | Fiber reinforced structural foam material with three-dimensional network structure |
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| CN103865144A (en) * | 2012-12-13 | 2014-06-18 | 江南大学 | Mesh type three-dimensional woven grid fabric reinforced lightweight plate and preparation method thereof |
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| CN103865144A (en) * | 2012-12-13 | 2014-06-18 | 江南大学 | Mesh type three-dimensional woven grid fabric reinforced lightweight plate and preparation method thereof |
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| CN111349312A (en) * | 2018-12-24 | 2020-06-30 | 湖南莱科新材料科技有限公司 | Fiber reinforced structural foam material with three-dimensional network structure |
| CN111349312B (en) * | 2018-12-24 | 2024-03-15 | 湖南莱科新材料科技有限公司 | Fiber reinforced structural foam material with three-dimensional network structure |
| CN110065287A (en) * | 2019-05-27 | 2019-07-30 | 重庆理工大学 | A kind of bubble core phase transformation sandwich structure composite material and preparation method thereof |
| CN110978672A (en) * | 2019-12-17 | 2020-04-10 | 南京工程学院 | Integrally formed sandwich structure and process |
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| CN107083019B (en) | 2020-01-31 |
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