CN111775517A - Light honeycomb sandwich structure integrating structure and biological safety and preparation method thereof - Google Patents
Light honeycomb sandwich structure integrating structure and biological safety and preparation method thereof Download PDFInfo
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Abstract
The invention provides a structure and biosafety integrated light honeycomb sandwich structure and a preparation method thereof, wherein the structure comprises two functional layers, two structural layers and a honeycomb layer, wherein the two structural layers are symmetrically arranged at two sides of the honeycomb layer, the 0-degree direction of the structural layers is consistent with the L direction of the honeycomb stretching direction, and the two functional layers are symmetrically arranged at the outer sides of the two structural layers; the functional layer is formed by curing a prepreg compounded by a resin adhesive film containing inorganic antibacterial master batches and a reinforcing material; the structural layer is formed by curing a prepreg compounded by a resin adhesive film and a reinforcing material; the honeycomb layer is a paper honeycomb structure impregnated with phenolic resin added with an antibacterial agent and/or a mildew preventive. The honeycomb sandwich structure has the antibacterial rate of more than or equal to 99 percent on staphylococcus aureus and escherichia coli, the antibacterial rate of more than or equal to 80 percent on candida albicans, the mildew-proof grade of 0 grade and good mechanical property retentivity.
Description
Technical Field
The invention belongs to the technical field of composite material manufacturing, and particularly relates to a light honeycomb sandwich structure integrating structure and biological safety and a preparation method thereof.
Background
The honeycomb sandwich structure material is an efficient material with light weight, high specific strength and high specific rigidity, can be used for manufacturing structural members and functional members for heat insulation, noise reduction and the like, and is one of main materials for manufacturing advanced aircrafts in the future. Among various existing honeycombs, metal honeycombs have a large specific gravity, and with the rapid development of composite material science and the increasing urgent weight reduction requirements, structural parts such as aerospace stations and aircrafts are gradually updated from metals to resin-based composite materials. However, if the non-metallic resin-based composite material is in a closed or humid environment for a long time, the propagation problem of mold is easily caused, so the indexes of the non-metallic material under the working condition, such as antibiosis and mildew prevention, need to be controlled.
Strategic tactical weapons have a long storage and transportation period between manufacture and use, and mold propagation and other problems are easy to occur in the process, so that the potential problem of structural performance reduction is brought. The aeroengine acoustic lining component is in a wet environment for a long time due to a weather environment, and although the design of the drainage channel exists, water accumulation inevitably exists in the honeycomb, and the potential performance reduction problem is also caused. The sealed and unsealed compartments of the space station, both inside and outside the compartments, also use a large amount of resin-based composite material. Compared with metal materials, the resin-based composite material in the sealed cabin can become a mould breeding place and the like. In order to control the microorganisms in the sealed cabin, the biological safety indexes of the resin-based composite material in the cabin, such as antibiosis, mildew prevention and the like, need to be controlled. Meanwhile, the main functions of the space station interior decoration system are to provide hard support for the cabin, so that the space station interior decoration system is convenient for the astronaut to support by means of force and simultaneously realizes the overall architecture of the cabin, thereby having strict requirements on the mechanical properties of the used resin matrix composite material.
Based on the above problems, there is a need for a complete material design basis and a preparation technology for performing structural biosafety integrated composite design and preparation on a resin-based composite material member to realize a structure.
Disclosure of Invention
In order to overcome the defects in the prior art, the inventor of the invention carries out intensive research, provides a light honeycomb sandwich structure integrating structure and biological safety and a preparation method thereof, and solves the problem of the biological safety performance of a panel by introducing high-concentration inorganic antibacterial masterbatch RHA-TA adaptive to the process; the liquid inorganic antibacterial agent CAG6000 and the mildew preventive A02 are introduced in the gum dipping process of honeycomb preparation, the biological safety performance of the honeycomb is realized, the panel with higher content is laid on the surface layer, the panel without the antibacterial mildew preventive is used as the middle layer, the biological safety performance can be realized, and the structural performance is ensured, so that the invention is completed.
The technical scheme provided by the invention is as follows:
in a first aspect, the structure and biosafety integrated light honeycomb sandwich structure comprises two functional layers, two structural layers and a honeycomb layer, wherein the two structural layers are symmetrically arranged on two sides of the honeycomb layer, the 0-degree direction of the structural layers is consistent with the L direction of a honeycomb, and the two functional layers are symmetrically arranged on the outer sides of the two structural layers; the functional layer is formed by curing a prepreg compounded by a resin adhesive film containing inorganic antibacterial master batches and a reinforcing material; the structural layer is formed by curing a prepreg compounded by a resin adhesive film and a reinforcing material; the honeycomb layer is a paper honeycomb structure impregnated with phenolic resin added with an antibacterial agent and/or a mildew preventive.
In a second aspect, a method for preparing a structure and biosafety integrated lightweight honeycomb sandwich structure is used for preparing the structure and biosafety integrated lightweight honeycomb sandwich structure of the first aspect, and comprises the following steps:
step 4, forming: designing the proportion of the functional layer and the structural layer according to the actual working condition requirements, then sequentially paving the functional layer and the structural layer on a panel mould, and curing and molding the autoclave to form an integrated panel;
and then sequentially placing the panel with the functional layer on the outer side, the glue film, the honeycomb layer, the glue film and the panel with the functional layer on the outer side in an assembly mold, and curing and molding the panel by using an autoclave.
According to the structure and biosafety integrated light honeycomb sandwich structure and the preparation method thereof provided by the invention, the following beneficial effects are achieved:
(1) according to the honeycomb sandwich structure, the material-grade biological safety performance of the panel (the functional layer and the structural layer) and the aramid paper honeycomb is realized, the antibacterial rate to staphylococcus aureus and escherichia coli is more than or equal to 99%, the antibacterial rate to candida albicans is more than or equal to 80%, and the mildew-proof grade is 0;
(2) according to the honeycomb sandwich structure, the functional layer with high antibacterial agent content is used as the surface layer, and the structural layer without the antibacterial agent is used as the middle layer, so that the mechanical property of the structure is ensured while the biological safety performance is realized; compared with a system in which inorganic antibacterial master batches are uniformly distributed in a functional layer and a structural layer, the mechanical property retention rate is 10% -20% higher than that of a system with equivalent antibacterial property, and the killing capacity to candida albicans is more than 30% higher than that of a system with the same average content.
Drawings
Fig. 1 shows a schematic structural view of a honeycomb sandwich structure in the present invention;
fig. 2 shows the results of the antibacterial performance of the honeycomb layer, the first column for each item being the antibacterial rate of staphylococcus aureus, the second column for escherichia coli, and the third column for the antibacterial rate of candida albicans;
fig. 3 shows the results of the antibacterial performance of the honeycomb sandwich structure, the first column for each item is the antibacterial rate of staphylococcus aureus, the second column for escherichia coli, and the third column for candida albicans.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
According to a first aspect of the present invention, as shown in fig. 1, there is provided a structure and biosafety integrated light honeycomb sandwich structure, the structure comprises two functional layers 1, two structural layers 2 and a honeycomb layer 3, wherein the two structural layers 2 are symmetrically arranged at two sides of the honeycomb layer 3, the 0 ° direction of the structural layers is consistent with the L direction of the honeycomb, and the two functional layers 1 are symmetrically arranged at the outer sides of the two structural layers 2; the functional layer is formed by curing a prepreg compounded by a resin adhesive film containing inorganic antibacterial master batches and a reinforcing material; the structural layer is formed by curing a prepreg compounded by a resin adhesive film and a reinforcing material; the honeycomb layer is a paper honeycomb structure impregnated with phenolic resin added with an antibacterial agent and/or a mildew preventive. Wherein, the honeycomb L direction refers to the honeycomb cell stretching direction.
In the present invention, the honeycomb layer 3 is selected from any one of aramid paper honeycomb or glass fiber reinforced plastic honeycomb. The honeycomb layer 3 can be a plurality of specifications of honeycombs with or without grooves.
Furthermore, antibacterial agents and mildew preventive agents are added into the phenolic resin impregnated in the honeycomb layer 3 forming process, so that the honeycomb structure with biosafety is obtained, wherein the antibacterial agents are liquid inorganic antibacterial agents CAG6000, and the mildew preventive agents are mildew preventive agents A02. Wherein CAG6000 is a pure inorganic nano-silver antibacterial agent, is a nano-silver solution, and has a silver content of more than 6000 ppm; the mildew preventive A02 is a high-efficiency liquid antibacterial mildew preventive, is a nonionic system, adopts an organic-inorganic composite mildew preventive, and has broad-spectrum antibacterial mildew preventive performance. .
The addition amount of the antibacterial agent is 5-45 wt% of the phenolic resin dry glue, and the addition amount of the mildew preventive is 5-10 wt% of the phenolic resin dry glue. To impregnate the honeycomb or to coat the film, a solvent is added to the resin, wherein the resin without solvent is known as a dry glue. The antibacterial agent and the mildew preventive in the addition range have the antibacterial rate of more than or equal to 99 percent on staphylococcus aureus and escherichia coli, the antibacterial rate of more than or equal to 80 percent on candida albicans and the mildew-proof grade of 0.
In the functional layer, the inorganic antibacterial master batch is the inorganic antibacterial master batch RHA-TA which is an inorganic antibacterial mildew preventive with silver and zinc as active components, the content of the active components is more than or equal to 93 percent, the temperature resistance reaches 500 ℃, and the functional layer is suitable for injection molding and other processes. The inventor adopts the antibacterial agent in the form of master batch in the functional layer instead of selecting the liquid antibacterial agent, because the viscosity of the resin needs to be ensured in the glue film making stage of the resin, if the liquid antibacterial agent is used, the viscosity of the system is reduced, and the prepreg preparation process is influenced; the reason for selecting the RHA-TA is that the inorganic antibacterial mildew preventive has good heat resistance, good process adaptability, slow release antibacterial property and long antibacterial property aging. Silver-based antibiotics have a contact reaction with bacterial and fungal cell membranes, and can cause the destruction or dysfunction of inherent components of bacteria, thereby causing the death of the bacteria.
In the functional layer, the addition amount of the inorganic antibacterial master batch is 2 wt% -20 wt% of the dry resin glue. Tests show that when the addition amount is more than 2 wt%, the antibacterial rate to staphylococcus aureus and escherichia coli is more than or equal to 99%, the antibacterial rate to candida albicans is more than or equal to 80%, and the mildew-proof grade is 0 grade; when the amount exceeds 20 wt%, the coating film formed by resin coating is not uniform in quality and cannot be uniformly coated to form a film.
In the functional layer, the reinforcing material can be selected from one or a combination of T300, T700, T800, M40J high-performance carbon fiber, glass fiber, aramid fiber unidirectional tape or two-dimensional fabric.
In the functional layer, the resin may be selected from one or a combination of epoxy resin, bismaleimide resin, cyanate resin, polyimide resin, or phthalonitrile resin system.
In the invention, in the structural layer, the reinforcing material can be selected from one or a combination of T300, T700, T800, M40J high-performance carbon fiber, glass fiber, aramid fiber unidirectional tape or two-dimensional fabric.
In the structural layer, the resin can be selected from one or a combination of epoxy resin, bismaleimide resin, cyanate resin, polyimide resin or phthalonitrile resin system.
In the structural layer, the resin does not contain an antibacterial agent so as to ensure the mechanical property of the structural layer, thereby realizing the mechanical property of the whole structure. In the invention, the functional layer mainly provides a biological safety function of the honeycomb sandwich structure panel, the structural layer mainly provides a mechanical function of the honeycomb sandwich structure panel, the number of the structural layer is far greater than that of the functional layer, and the number of the functional layer is controlled to be below 4 as much as possible. Functional layer and structural layer set up respectively, compare in homogenization functional layer and structural layer, when improving inside and outside antibacterial property, do benefit to the mechanical strength who guarantees honeycomb sandwich structure.
The honeycomb sandwich structure ensures that the antibacterial rate to staphylococcus aureus and escherichia coli is more than or equal to 99 percent, the antibacterial rate to candida albicans is more than or equal to 80 percent, and the mildew-proof grade is 0 grade; the antibacterial rate of the honeycomb layer in the honeycomb sandwich structure to staphylococcus aureus and escherichia coli is more than or equal to 99%, the antibacterial rate to candida albicans is more than or equal to 80%, the mildew-proof grade is 0 grade, the test standards of the panel and the sandwich structure are GJB150.10A-2009 and QB/T2591-2003, and the test standard of the honeycomb is GB/T20944.3.
Compared with a system in which inorganic antibacterial master batches are uniformly distributed in the functional layer and the structural layer, the functional layer and the structural layer of the honeycomb sandwich structure have the advantages that the mechanical property retention rate is 10-20% higher than that of the system with equivalent antibacterial property, and the killing capacity to candida albicans is more than 30% higher than that of the system with the same average content.
According to a second aspect of the present invention, there is provided a method for preparing a light honeycomb sandwich structure integrated with biosafety, which is used for preparing the light honeycomb sandwich structure integrated with biosafety, and comprises the following steps:
step 4, forming: designing the proportion of the functional layer and the structural layer according to the actual working condition requirements, then sequentially paving the functional layer and the structural layer on a panel mould, and curing and molding the functional layer and the structural layer in an autoclave;
and then sequentially placing a panel with a functional layer on the outer side, a glue film, a honeycomb layer (judging whether the honeycomb needs to be shaped or not according to different structures), the glue film and the panel with the functional layer on the outer side in an assembly mold, and curing and molding by using an autoclave.
In the invention, in the step 1, the inorganic antibacterial master batch is the inorganic antibacterial master batch RHA-TA. The addition amount of the inorganic antibacterial master batch is 2 to 20 weight percent of the dry resin adhesive.
The reinforcing material may be selected from one or a combination of T300, T700, T800, M40J high performance carbon fibers, glass fibers, aramid fiber unidirectional tapes or two-dimensional fabrics thereof. The resin may be selected from one or a combination of epoxy, bismaleimide, cyanate ester, polyimide, or phthalonitrile resin systems.
The thickness of the single-layer function layer after the prepreg is cured is controlled within the range of 0.05-0.3 mm.
In the present invention, in step 2, the reinforcing material may be selected from one or a combination of T300, T700, T800, M40J high performance carbon fiber, glass fiber, aramid fiber unidirectional tape or two-dimensional fabric thereof. The resin may be selected from one or a combination of epoxy, bismaleimide, cyanate ester, polyimide, or phthalonitrile resin systems.
The prepreg does not contain an antimicrobial agent.
The thickness of the single-layer structure layer after prepreg curing is controlled within the range of 0.05-0.3 mm.
In the invention, in the step 3, the honeycomb layer is selected from any one of aramid paper honeycomb or glass fiber reinforced plastic honeycomb. The honeycomb layer can be a plurality of specifications of honeycombs which are grooved or not grooved.
Furthermore, the phenolic resin impregnated in the honeycomb layer is added with an antibacterial agent and a mildew preventive to obtain a honeycomb structure with biosafety, wherein the antibacterial agent is a liquid inorganic antibacterial agent CAG6000, and the mildew preventive is a mildew preventive A02. The addition amount of the antibacterial agent is 5-45 wt% of the phenolic resin dry glue, and the addition amount of the mildew preventive is 5-10 wt% of the phenolic resin dry glue.
In the invention, in step 4, the number of prepreg layers in the structural layer is far larger than that in the functional layer, and the number of functional layer layers is controlled to be less than 4.
In step 4, the adhesive film is selected from any one or combination of J-47C adhesive film, J-116A, SJ-2C and the like.
Examples example 1
A structure and biosafety integrated light honeycomb sandwich structure is shown in figure 1 and comprises a functional layer 1, a structural layer 2 and aramid paper honeycombs 3. The reinforcing material of the functional layer/the structural layer is carbon fiber unidirectional tape T700 (Nippon Tokory), the resin is toughened 604 epoxy resin (aerospace materials and process research institute), the inorganic antibacterial master batch RHA-TA (Shanghai Runhe nanometer materials science and technology Co., Ltd.), the aramid paper honeycomb NH-2.75-32-10mm (Suzhou aromatic Lei honeycomb composite Co., Ltd.), the liquid inorganic antibacterial agent CAG6000 (Beijing Chonggao nanometer technology Co., Ltd.), and the mildew preventive agent is mildew preventive A02 (Beijing Chonggao nanometer technology Co., Ltd.); J-47C glue film (petrochemical research institute of academy of sciences of Heilongjiang province).
A method of making a honeycomb sandwich structure comprising the steps of:
selecting inorganic antibacterial masterbatch RHA-TA as an additive, wherein the addition proportion is 7.5 percent of the mass fraction of resin dry glue, fully mixing the additive with 604 epoxy resin, coating the mixture to form a film, and preparing the film and a reinforcing material into uniform dry prepreg; the thickness of the single layer after curing is 0.05 mm;
an additive-free T700/604 prepreg was prepared by the same process, with a 0.05mm monolayer thickness after curing. The functional layer is 2 layers, the structural layer is 8 layers, and the average content of the final panel RHA-TA additive is 1.5 wt% (resin dry glue);
in the gum dipping process of preparing the honeycomb layer, adding a liquid inorganic antibacterial agent CAG6000 and a mildew preventive A02 into the phenolic resin, dipping the phenolic resin in the gum, and drying, wherein the adding amount of A02 is 10 wt% of the dry phenolic resin, and the adding amount of CAG6000 is 20 wt% of the dry phenolic resin;
laying 2 functional layers and 8 structural layers in sequence, and curing and molding the panel by using an autoclave;
and then sequentially placing the formed panel, the J-47C adhesive film, the aramid paper honeycomb, the J-47C adhesive film and the formed panel in an assembly die, paying attention to the asymmetry of the panel, controlling the functional layer to be exposed on the outer surface, and curing and forming by using an autoclave.
Example 2
A structure and biosafety integrated light honeycomb sandwich structure is shown in figure 1 and comprises a functional layer 1, a structural layer 2 and aramid paper honeycombs 3. The antibacterial reinforced cloth/reinforced cloth base material of the functional layer/the structural layer is aramid fiber forged fabric, eight three-flyaway forged patterns F-8H3 (Yixing Tianqi), the resin is toughened 602 epoxy resin (aerospace materials and process research institute), inorganic antibacterial master batch RHA-TA (Shanghai Runhe nanometer materials science and technology Co., Ltd.), aramid paper honeycomb NH-5.5-48-20mm (Suzhou aromatic Lei honeycomb composite Co., Ltd.), liquid inorganic antibacterial agent CAG6000 (Beijing Chonggao nanometer technology Co., Ltd.), and the mildew preventive is mildew preventive A02 (Beijing Chonggao nanometer technology Co., Ltd.); J-47C glue film (petrochemical research institute of academy of sciences of Heilongjiang province).
A method of making a honeycomb sandwich structure comprising the steps of:
selecting inorganic antibacterial masterbatch RHA-TA as an additive, wherein the addition proportion is 6 percent of the mass fraction of resin dry glue, fully mixing the additive with 602 epoxy resin, coating the mixture to form a film, and preparing the film and a reinforcing material into uniform dry prepreg; the thickness of the single layer after curing is 0.12 mm;
F-8H3/602 prepreg containing no RHA-TA additive was prepared by the same procedure with a 0.12mm monolayer thickness after curing. The functional layer and the structural layer are respectively 3 layers, and the average content of the final panel additive is 3 wt% (resin dry glue);
in the gum dipping process of preparing the honeycomb layer, adding a liquid inorganic antibacterial agent CAG6000 and a mildew preventive A02 into the phenolic resin, dipping the phenolic resin in the gum, and drying, wherein the adding amount of A02 is 10 wt% of the dry phenolic resin, and the adding amount of CAG6000 is 30 wt% of the dry phenolic resin;
sequentially laying 3 functional layers and 3 structural layers, and curing and molding the panel by using an autoclave;
and then sequentially placing the formed panel, the J-47C adhesive film, the aramid paper honeycomb, the J-47C adhesive film and the formed panel in an assembly die, paying attention to the asymmetry of the panel, controlling the functional layer to be exposed on the outer surface, and curing and forming by using an autoclave.
Examples of the experiments
Experimental example 1
For the honeycomb layer material of the honeycomb sandwich structure, the evaluation of the antibacterial performance of the textile is carried out according to the following part 3: the material antibacterial performance test is carried out by a method specified in the oscillation method (GB/T20944.3-2008), and the mildew-proof performance is carried out according to GJB150.10A-2009 standard. The honeycomb layer was prepared in the manner of example 1, and in the preparation process of the honeycomb layer, 10%, 30%, and 40% of additives (the addition amount of the mildewcide a02 was 5%, and the rest was the antibacterial agent CAG6000) were added, respectively, and the prepared honeycomb layer was subjected to antibacterial ability test.
The results of the tests on the antibacterial performance of the honeycomb layer are shown in fig. 2, and it can be seen from fig. 2 that the antibacterial rate of the honeycomb layer in the traditional mode to staphylococcus aureus, escherichia coli and candida albicans is lower than 70%, and the antibacterial rate of the honeycomb layer with the additives added is greater than 90% in 10%, 30% and 40%. On the other hand, the mildew-proof performance grade is that the honeycomb in the traditional mode is 2-grade light, the mildew on the surface of the material continuously spreads, and the surface below the mildew is still visible; and other samples are all grade 0, and the material has no mould growth.
Experimental example 2
For the panel material of the honeycomb sandwich structure, a material antibacterial performance test is carried out according to a method specified in appendix A of antibacterial plastic antibacterial performance test method and antibacterial effect (QB/T2591-. The antibacterial performance test result of the panel material is shown in table 1, wherein 0% in table 1 is a structural layer; 1.0%, 1.5%, 2.0%, 3.0%, 6.0%, 10.0%, 20.0% refers to the addition amount of the pure functional layer; 1.5A%, 3.0A%, 1.5B%, 3.0B% refer to the panels of examples 1 and 2, A representing the experimental plane as the functional plane and B representing the experimental plane as the structural plane.
As can be seen from Table 1, the structural layer corresponds to the test result of 0%, and the antibacterial rate of the structural layer to the three bacteria is lower than 50%; when the content of the additive is 1.5%, the antibacterial rate of the additive to candida albicans is only 49%, and is far lower than 80%.
1.5A% and 3.0A% respectively correspond to the panel antibacterial performance (experimental surface is functional surface) of examples 1 and 2, the antibacterial rate to the three kinds of bacteria is higher than 90%, and 1.5B% and 3.0B% compared with the three kinds of bacteria are panels with the same structure, but the experimental surface is changed from the functional layer to the structural layer, and the antibacterial rate is seen to be reduced sharply; by comparing the results of 1.5% and 1.5A%, the method can improve the antibacterial rate of Candida albicans by 30%.
TABLE 1
Experimental example 3
For the whole honeycomb sandwich structure, the evaluation of the antibacterial performance of the textile is carried out according to the following part 3: the material antibacterial performance test is carried out by a method specified in the oscillation method (GB/T20944.3-2008), and the mildew-proof performance is carried out according to GJB150.10A-2009 standard.
The results of the tests on the antibacterial performance of the honeycomb sandwich structures of examples 1 and 2 are shown in fig. 3, and it can be seen from fig. 3 that the antibacterial rate of the sandwich structure of the conventional mode to staphylococcus aureus, escherichia coli and candida albicans is less than 60%, and the antibacterial rate of the sandwich structure of examples 1 and 2 is more than 90%. And the mildew-proof performance grade is 0 grade in the traditional mode and the two embodiments, and the material has no mildew growth.
Experimental example 4
The mechanical properties of the pure functional layer, the pure structural layer and the hybrid structure of both (panel) of example 1 were systematically studied and the test results are listed in table 2. The structural layer has a corresponding mechanical property of 0 percent, the functional layer has a corresponding mechanical property of 7.5 percent, and the mixture has a corresponding mechanical property of 1.5A percent. It can be seen from table 2 that, with the addition of the antibacterial and antifungal agent, the overall mechanical properties show a decreasing trend, but the mechanical properties of the panel hybrid structure of the final product are generally higher than those of the pure functional layer by more than 10-20%, which not only realizes higher biological safety performance, but also is higher than that of a system with equivalent antibacterial performance by 10-20%.
TABLE 2
Parameter(s) | 0% | 7.50% | 1.50A |
Longitudinal tensile strength/MPa | 793 | 530 | 605 |
Tensile modulus in the machine direction/GPa | 49.5 | 30.2 | 34.5 |
Transverse tensile strength/MPa | 798 | 515 | 654 |
Transverse tensile modulus/GPa | 51.1 | 30.6 | 37.5 |
Longitudinal compressive strength/MPa | 635 | 415 | 473 |
Modulus of longitudinal compression/GPa | 63.3 | 33.6 | 40.1 |
Transverse compressive strength/MPa | 644 | 398 | 455 |
Transverse compressive modulus/GPa | 69.4 | 31.1 | 38.3 |
Longitudinal bending strength/MPa | 906 | 661 | 767 |
Flexural modulus in the machine direction/GPa | 44.5 | 32.1 | 35.6 |
Transverse bending strength/MPa | 901 | 559 | 668 |
Transverse flexural modulus/GPa | 42.8 | 30.4 | 33.9 |
Longitudinal layer shear strength/MPa | 59.0 | 56.1 | 69 |
Transverse layer shear strength/MPa | 56.0 | 54.0 | 59.9 |
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (9)
1. A structure and biosafety integrated light honeycomb sandwich structure is characterized by comprising two functional layers, two structural layers and a honeycomb layer, wherein the two structural layers are symmetrically arranged on two sides of the honeycomb layer, the 0-degree direction of the tensile structural layer is consistent with the L direction of a honeycomb, and the two functional layers are symmetrically arranged on the outer sides of the two structural layers; the functional layer is formed by curing a prepreg compounded by a resin adhesive film containing inorganic antibacterial master batches and a reinforcing material; the structural layer is formed by curing a prepreg compounded by a resin adhesive film and a reinforcing material; the honeycomb layer is a paper honeycomb structure impregnated with phenolic resin added with an antibacterial agent and/or a mildew preventive.
2. The honeycomb sandwich structure according to claim 1, wherein an antibacterial agent and a mildew preventive are added into the phenolic resin impregnated in the honeycomb layer forming process, the antibacterial agent is a liquid inorganic antibacterial agent CAG6000, and the mildew preventive is mildew preventive A02.
3. The honeycomb sandwich structure according to claim 2, wherein the antibacterial agent is added in an amount of 5-45 wt% of the phenolic resin dry glue, and the mildewproof agent is added in an amount of 5-10 wt% of the phenolic resin dry glue.
4. The honeycomb sandwich structure of claim 1, wherein the inorganic antibacterial masterbatch is the inorganic antibacterial masterbatch RHA-TA in the functional layer.
5. The honeycomb sandwich structure according to claim 4, wherein the inorganic antibacterial masterbatch is added in the functional layer in an amount of 2-20 wt% of the dry resin adhesive.
6. The honeycomb sandwich structure according to claim 1, wherein in the functional layer, the reinforcing material may be selected from one or a combination of T300, T700, T800, M40J high performance carbon fiber, glass fiber, aramid fiber unidirectional tape or two-dimensional fabric thereof;
the resin may be selected from one or a combination of epoxy, bismaleimide, cyanate ester, polyimide, or phthalonitrile resin systems.
7. The honeycomb sandwich structure of claim 1, wherein in the structural layer, the reinforcing material can be selected from one or a combination of T300, T700, T800, M40J high-performance carbon fiber, glass fiber, aramid fiber unidirectional tape or two-dimensional fabric thereof;
the resin may be selected from one or a combination of epoxy, bismaleimide, cyanate ester, polyimide, or phthalonitrile resin systems.
8. A method for preparing a light honeycomb sandwich structure with integrated structure and biosafety, which is used for preparing the light honeycomb sandwich structure with integrated structure and biosafety of any one of claims 1 to 7, and comprises the following steps:
step 1, preparing a functional layer raw material: selecting inorganic antibacterial master batches as additives, fully mixing the additives with resin, coating the mixture to form a film, and preparing the film and a reinforcing material into uniform dry prepreg;
step 2, preparing raw materials of a structural layer: selecting a resin system and a reinforcing material which are the same as those of the functional layer, and compounding the resin system and the reinforcing material into a dry prepreg, wherein the structural layer does not contain inorganic antibacterial master batches;
step 3, preparing a honeycomb layer raw material: in the gum dipping process of the paper honeycomb preparation, adding an antibacterial agent and/or a mildew preventive into phenolic resin, dipping gum, and preparing semi-cured or cured honeycomb according to the final molding requirement;
step 4, forming: designing the proportion of the functional layer and the structural layer according to the actual working condition requirements, then sequentially paving the functional layer and the structural layer on a panel mould, and curing and molding the autoclave to form an integrated panel;
and then sequentially placing the panel with the functional layer on the outer side, the glue film, the honeycomb layer, the glue film and the panel with the functional layer on the outer side in an assembly mold, and curing and molding the panel by using an autoclave.
9. The method according to claim 8, wherein in step 4, the number of structural layers is much greater than that of functional layers, and the number of functional layers is controlled to be 4 or less.
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