Hybrid high-performance fiber recombined bamboo and manufacturing method thereof

Abstract

The invention discloses a hybrid high-performance fiber recombined bamboo and a manufacturing method thereof, and relates to the technical field of building materials. The hybrid high-performance fiber recombined bamboo comprises bamboo bundles and high-performance fibers. Wherein the bamboo bundles and the high-performance fiber blanks form fiber and bamboo bundle mixed prefabricated blanks, and the fiber and bamboo bundle mixed prefabricated blanks are pressed to form the mixed high-performance fiber recombined bamboo; bamboo bundles and high-performance fibers are uniformly mixed and directly pressed to form the composite material in the forms of pasting, blank assembling and the like, grooving and secondary processing are not needed, and therefore the integrity of the composite material can be guaranteed, the bonding performance of the composite material is remarkably improved, the better cooperative work effect is achieved, the mechanical property of the fibers is fully utilized, and the service life of the composite material is prolonged. The bearing capacity and the rigidity of the recombined bamboo are effectively improved, and due to the good bonding performance, after high-performance fibers are broken, the recombined bamboo still bears a part of loads, and certain contribution is made to the rigidity.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to a mixed high-performance fiber reconstituted bamboo and a manufacturing method thereof. Background Art

[0002] Traditional building materials such as steel and concrete consume a lot of energy during production and cause damage to the environment. As a green and environmentally friendly alternative material, bamboo has the characteristics of short growth cycle and high strength. However, traditional bamboo has anisotropy, low cross-sectional stiffness, insufficient bending bearing capacity, and is prone to cracks under load and shrinkage effects. Long-term loads lead to stiffness degradation, increased deflection and reduced strength. Therefore, bamboo is mainly used in flooring, furniture and decoration, and cannot be fully used in building materials.

[0003] Based on the above problems, researchers have studied methods such as external bonding of fiber-reinforced composite materials, bottom reinforcement, and introduction of high-performance fibers at specific levels to improve traditional reconstructed bamboo. However, these improvement measures are often limited by the constraints of bonding performance, resulting in the failure to fully utilize the mechanical properties of the composite materials. Therefore, the present invention proposes a mixed high-performance fiber reconstructed bamboo. The bamboo bundles and high-performance fibers are evenly mixed by pasting, forming embryos, etc., and then directly pressed. It not only ensures the integrity of the reconstructed bamboo, but also significantly improves the bonding performance of the composite material, achieves a better synergistic working effect, and fully utilizes the mechanical properties of the fiber. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a hybrid high-performance fiber reconstituted bamboo and a manufacturing method thereof, which solves at least one technical problem raised in the background technology.

[0006] (II) Technical solution

[0007] The technical solution adopted by the present invention is:

[0008] In a first aspect, the present invention provides a hybrid high-performance fiber reconstructed bamboo, wherein the hybrid high-performance fiber reconstructed bamboo comprises a bamboo bundle and high-performance fibers;

[0009] The bamboo bundle and the high-performance fiber embryo form a fiber bamboo bundle mixed preform, and the fiber bamboo bundle mixed preform is pressed to form a mixed high-performance fiber reconstituted bamboo.

[0010] Preferably, the high-performance fiber is a fiber impregnated with a silane coupling agent.

[0011] Preferably, the preparation method of the fiber bamboo bundle mixed preform is: bamboo bundles and high-performance fibers are pasted together to form a preform;

[0012] Alternatively, bamboo bundles and high-performance fibers are laid alternately to form the embryo.

[0013] In a second aspect, the present invention further provides a method for preparing a hybrid high-performance fiber reconstructed bamboo, the preparation method comprising:

[0014] The high-performance fiber is immersed in a silane coupling agent for surface activation treatment to obtain a pretreated high-performance fiber;

[0015] The bamboo bundle and the pretreated high-performance fiber are impregnated with phenolic resin respectively, and then dried;

[0016] The dried bamboo bundles and high-performance fibers are combined to form a fiber-bamboo bundle hybrid preform;

[0017] The fiber bamboo bundle mixed preform is pressed to obtain the mixed high-performance fiber reconstituted bamboo.

[0018] Preferably, the preparation method of the bamboo bundle is:

[0019] The original bamboo is cut into bamboo strips, and the green and yellow parts are removed to form bamboo bundles.

[0020] Preferably, the method of combining the bamboo bundle and the high-performance fiber to form a fiber-bamboo bundle hybrid preform is:

[0021] The bamboo bundles and high-performance fibers are glued together and then assembled.

[0022] Preferably, the method of combining the bamboo bundles and the high-performance fibers to form the fiber-bamboo-bundle mixed preform is: the bamboo bundles and the high-performance fibers are laid alternately to form the preform.

[0023] Preferably, the dried bamboo bundles are pre-pressed and flattened;

[0024] The dried high-performance fiber is evenly laid on the bamboo bundle along the grain or across the grain;

[0025] Then, bamboo bundles are evenly laid on the surface of the high-performance fiber along the grain or across the grain;

[0026] The bamboo bundles and the high-performance fibers are laid alternately in sequence to form a fiber-bamboo-bundle mixed preform.

[0027] Preferably, the bamboo bundles impregnated with phenolic resin and the pretreated high-performance fibers are dried to a moisture content of 10%-12%.

[0028] Preferably, the bamboo bundles and the pretreated high-performance fibers are respectively impregnated with phenolic resin, and the impregnation amount is 6%-10%.

[0029] (III) Beneficial effects

[0030] The present invention provides a hybrid high-performance fiber reconstituted bamboo and a manufacturing method thereof, which has the following beneficial effects compared with the prior art:

[0031] The mixed high-performance fiber reconstructed bamboo and the manufacturing method thereof provided in the embodiments of the present invention are formed by uniformly mixing bamboo bundles and high-performance fibers in the form of pasting, embryo assembly, etc., and directly pressing them without grooving or secondary processing. Therefore, the integrity of the beam can be ensured, the bonding performance of the composite material can be significantly improved, and a better collaborative working effect can be achieved, so that the mechanical properties of the fibers are fully utilized, and the bearing capacity and stiffness of the reconstructed bamboo are effectively improved. In addition, the good bonding performance can enable the high-performance fibers to still bear a part of the load after breaking, which has a certain contribution to the stiffness.

[0032] In addition, the mixing of high-performance fibers can also make the reconstructed bamboo achieve multi-level damage when subjected to tension and bending, improving the ductility and safety of the material. By evenly mixing bamboo bundles with high-performance fibers, the anisotropy of the reconstructed bamboo can be reduced, and the dimensional stability of the reconstructed bamboo can be improved, thereby reducing the possibility of cracks caused by load and shrinkage, reducing the creep effect of the reconstructed bamboo under long-term load, and extending the service life of the reconstructed bamboo, opening up broader prospects for the application of bamboo in the field of building materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0034] Figure 1 This is a process flow chart of the paste-type mixed production process of the present invention;

[0035] Figure 2 This is a flow chart of the hybrid production process of the embryo assembly of the present invention;

[0036] Figure 3 It is a schematic diagram of bonding bamboo bundles and high-performance fiber bundles;

[0037] Figure 4 This is a schematic diagram of arranging high-performance fibers along the direction of bamboo bundles when forming long bamboo bundles;

[0038] Figure 5 This is a schematic diagram of arranging high-performance fibers perpendicular to the direction of bamboo bundles when forming long bamboo bundles;

[0039] Figure 6 This is a schematic diagram of randomly spreading short-cut high-performance fibers when forming long bamboo bundles. Specific implementation methods

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] An embodiment of the present invention provides a hybrid high-performance fiber reconstructed bamboo, wherein the hybrid high-performance fiber reconstructed bamboo comprises a bamboo bundle and high-performance fibers;

[0043] The bamboo bundle and the high-performance fiber embryo form a fiber bamboo bundle mixed preform, and the fiber bamboo bundle mixed preform is pressed to form a mixed high-performance fiber reconstituted bamboo.

[0044] The high-performance fiber is a fiber impregnated with a silane coupling agent.

[0045] Furthermore, the preparation method of the fiber bamboo bundle mixed preform is: the bamboo bundle and the high-performance fiber are pasted together and then assembled into a preform;

[0046] Alternatively, bamboo bundles and high-performance fibers are laid alternately to form the embryo.

[0047] That is, the embodiment of the present invention provides two ways to form the fiber bamboo bundle hybrid preform. The first way is to paste before assembling the preform, and the contact surface of the bamboo bundle and the high-performance fiber is parallel; Figure 3 As shown, the fibers are pasted along the direction of the bamboo bundle.

[0048] The second method is to add high-performance fibers when forming the embryo. First, lay a layer of bamboo bundles. Then, when laying the high-performance fibers, you can change the laying direction of the high-performance fibers, including along the grain, across the grain, and randomly. Bamboo bundles and high-performance fibers are laid alternately in sequence. Figure 4-Figure 6 shown.

[0049] The hybrid high-performance fiber reconstructed bamboo provided by the present invention can improve the bearing capacity and stiffness of the reconstructed bamboo, reduce the anisotropy of the reconstructed bamboo, reduce the creep effect under long-term load, and improve the dimensional stability.

[0050] Furthermore, the high-performance fiber is a fiber impregnated with a silane coupling agent.

[0051] The embodiment of the present invention evenly mixes bamboo bundles and high-performance fibers by pasting, forming embryos, etc., and directly presses them, without grooving or secondary processing, so the integrity of the beam can be ensured, the bonding performance of the composite material can be significantly improved, and a better collaborative effect can be achieved, so that the mechanical properties of the fibers can be fully utilized, and the bearing capacity and stiffness of the reconstructed bamboo can be effectively improved. In addition, the good bonding performance can make the high-performance fibers still bear a part of the load after breaking, which has a certain contribution to the stiffness. In addition, the mixed high-performance fibers can also make the reconstructed bamboo achieve multi-level failure when subjected to tension and bending, improving the ductility and safety of the material.

[0052] The existing reconstituted bamboo with CFRP attached to the bottom is often damaged due to debonding between CFRP and reconstituted bamboo, and the mechanical properties of CFRP cannot be fully utilized. The fibers of the uniformly mixed carbon fibers in the embodiment of the present invention can be fully bonded to the reconstituted bamboo inside the reconstituted bamboo, and can achieve cooperative deformation, and the performance can be fully utilized. By uniformly mixing the bamboo bundles with high-performance fibers, the anisotropy of the reconstituted bamboo can also be reduced, and the dimensional stability of the reconstituted bamboo can be improved, thereby reducing the possibility of cracks caused by load and shrinkage, reducing the creep effect of the reconstituted bamboo under long-term load, and extending the service life of the reconstituted bamboo, opening up a broader prospect for the application of bamboo in the field of building materials.

[0053] The method for preparing the above-mentioned hybrid high-performance fiber reconstructed bamboo of the present invention comprises:

[0054] The high-performance fiber is immersed in a silane coupling agent for surface activation treatment to obtain a pretreated high-performance fiber;

[0055] The bamboo bundle and the pretreated high-performance fiber are impregnated with phenolic resin respectively, and then dried;

[0056] The dried bamboo bundles and high-performance fibers are combined to form a fiber-bamboo bundle hybrid preform;

[0057] The fiber bamboo bundle mixed preform is pressed to obtain the mixed high-performance fiber reconstituted bamboo.

[0058] Furthermore, the preparation method of the bamboo bundle is:

[0059] The original bamboo is cut into bamboo strips, and the green and yellow parts are removed to form bamboo bundles.

[0060] High-performance fiber is a fiber impregnated with a silane coupling agent.

[0061] The surface activation treatment obtains the pretreated high-performance fiber. Specifically, the silane coupling agent KH550 can be selected in the implementation process. The high-performance fiber is immersed in the silane coupling agent for surface activation treatment to improve the interface bonding between it and the bamboo bundle, so that the hybrid high-performance fiber reconstructed bamboo has good overall performance.

[0062] Furthermore, the bamboo bundles impregnated with phenolic resin and the pretreated high-performance fibers in the above embodiments are dried to a moisture content of 10%-12%.

[0063] In the above embodiment, the bamboo bundle and the pretreated high-performance fiber are respectively impregnated with phenolic resin, and the impregnation amount is 6%-10%. The impregnation amount is specifically: assuming that the mass of the bamboo bundle after drying before impregnation is m1, and the mass of the bamboo bundle after impregnation and drying is m2, then the impregnation amount is (m2-m1) / m1×100%.

[0064] Furthermore, the method of combining the bamboo bundle and the high-performance fiber to form a fiber-bamboo bundle hybrid preform is:

[0065] The bamboo bundles and high-performance fibers are pasted together and then assembled.

[0066] Furthermore, the method for forming the fiber-bamboo-bundle mixed preform by combining the bamboo bundles and the high-performance fibers is: the bamboo bundles and the high-performance fibers are laid alternately to form the preform.

[0067] Furthermore, the specific process of histone embryogenesis is as follows:

[0068] Pre-press and flatten the dried bamboo bundles;

[0069] The dried high-performance fiber is evenly laid on the bamboo bundle along the grain or across the grain;

[0070] Then, bamboo bundles are evenly laid on the surface of the high-performance fiber along the grain or across the grain;

[0071] The bamboo bundles and the high-performance fibers are laid alternately in sequence to form a fiber-bamboo-bundle mixed preform.

[0072] In the above embodiment, the fiber bamboo bundle mixed preform is pressed to obtain the mixed high-performance fiber reconstituted bamboo, wherein the pressing is cold pressing or hot pressing.

[0073] The bamboo bundles and high-performance fibers are uniformly mixed by pasting or forming an embryo; the types, forming methods and mixing ratios of the bamboo bundles and high-performance fibers can be adjusted to meet different performance requirements;

[0074] Hybrid high-performance fiber reconstructed bamboo has good load-bearing capacity, stiffness, creep resistance and dimensional stability, and can also reduce the anisotropy of reconstructed bamboo.

[0075] In order to better understand the above technical solution, the above technical solution will be described below in conjunction with the accompanying drawings and specific implementation methods:

[0076] Example 1

[0077] A method for preparing a hybrid high-performance fiber reconstituted bamboo, such as Figure 1As shown, the following steps are included:

[0078] (1) Preparation of bamboo bundles:

[0079] S1, first cut the bamboo into bamboo tubes, split them into arc-shaped bamboo pieces along the longitudinal direction, then remove the green and yellow parts of the bamboo pieces, which is conducive to improving the bonding strength between the bamboo bundle and the high-performance fiber, and finally roll and loosen them to form a mesh bamboo bundle; the bamboo bundle is 30 mm wide, 1930 mm long, and 2 to 5 mm thick;

[0080] S2. Place the bamboo bundles in a drying oven for drying before gluing, with a constant temperature of 70°C to 90°C. After drying, the moisture content of the bamboo bundles reaches 6% to 8%.

[0081] (2) Preparation of high-performance fibers:

[0082] S1. High-performance fiber: The carbon fiber selected is soft in texture, with a density close to that of bamboo bundles, and is easy to press;

[0083] S2, immersing the carbon fiber in a 2% silane coupling agent KH550 solution for 20 minutes for surface activation treatment, which is beneficial to improving the bonding strength between the carbon fiber and the bamboo bundle;

[0084] S3. The approximate amount of the purchased carbon fiber mentioned above is calculated by the following formula:

[0085]

[0086] in, is the mass of the required carbon fiber bundle, is the density of the carbon fiber bundle, Target density for hybrid high performance fiber reconstituted bamboo, Target volume of hybrid high performance fiber reconstituted bamboo, is the mass ratio of carbon fiber to bamboo bundle.

[0087] (3) Impregnation with phenolic resin:

[0088] The bamboo bundles and carbon fiber bundles are respectively immersed in phenolic resin for 10 to 30 minutes, and then taken out and drained for later use.

[0089] (4) Second drying

[0090] The dipped bamboo bundles and carbon fiber bundles are placed in a drying oven for drying at a constant temperature of 40°C to 60°C. After drying, the moisture content of the bamboo bundles and carbon fiber bundles reaches 8% to 12%.

[0091] (5) Bonding

[0092] S1. Select JH801-2A / B epoxy resin glue from Zhimao Electronic Technology Co., Ltd., with the ratio of A and B components being 3:1. This epoxy resin glue is colorless and has good fluidity. It can effectively bond bamboo bundles and carbon fibers at room temperature, and it does not react with phenolic resin in the future, and can work together to improve the bonding performance;

[0093] S2. Calculate the average mass of one bamboo bundle by weighing the masses of 10 bamboo bundles, and then calculate the mass of the carbon fiber required for one bamboo bundle according to the mass ratio of the carbon fiber to the bamboo bundle and weigh it;

[0094] S3. Apply epoxy resin to the surface of the carbon fiber bundle and stick it to the bamboo bundle. To solve the problem that the epoxy resin takes a long time to cure and the carbon fiber and bamboo bundle cannot be bonded at the beginning, plastic clamps are placed at both ends of the bamboo bundle to initially fix the bamboo bundle and carbon fiber, and then placed at room temperature for 24 hours. See the schematic diagram of bonding carbon fiber and bamboo bundle for details. Figure 3 ;

[0095] S4. Place the newly reconstructed bamboo unit after bonding the carbon fiber and bamboo bundle in a drying oven for drying. Since the temperature range of epoxy resin curing is -20℃~90℃, the drying temperature should not be too high. Therefore, adjust the temperature of the drying oven to a constant temperature of 30℃~50℃. After drying, the moisture content of the newly reconstructed bamboo unit reaches 10%~15%.

[0096] (6) Cold pressing

[0097] The newly reconstructed bamboo unit is placed into the mold for embryo assembly (mold specifications are: width 152mm, height 152mm, length 1930mm), the pressure is 60-80MPa, the fiber bamboo bundle mixed preform is pressed into the mold by a cold press, and then the mold is locked.

[0098] (7) Heating and curing

[0099] The cold-pressed new reconstructed bamboo timber is placed in a curing tunnel together with the mold for curing at a temperature of 140℃~160℃ for 8~12h. After curing, it is cooled at room temperature for 20~36h. The density of the new reconstructed bamboo timber after curing is 1.0~1.3g / cm 3 .

[0100] (8) Maintenance

[0101] The new reconstructed bamboo lumber is demolded and then placed at room temperature for 2-3 weeks to obtain the mixed high-performance fiber reconstructed bamboo lumber.

[0102] Example 2

[0103] like Figure 2 As shown, the difference from Example 1 is that step (5) is not included, and the method of adding high-performance fibers is different, and the process is changed to hot pressing.

[0104] (1) Preparation of bamboo bundles:

[0105] S1, first cut the bamboo into bamboo tubes, split them into arc-shaped bamboo pieces along the longitudinal direction, then remove the green and yellow parts of the bamboo pieces, which is conducive to improving the bonding strength between the bamboo bundle and the high-performance fiber, and finally roll and loosen them to form a mesh bamboo bundle; the bamboo bundle is 30 mm wide, 1930 mm long, and 2 to 5 mm thick;

[0106] S2. Place the bamboo bundles in a drying oven for drying before gluing, with a constant temperature of 70°C to 90°C. After drying, the moisture content of the bamboo bundles reaches 6% to 8%.

[0107] (2) Preparation of high-performance fibers:

[0108] S1. High-performance fiber: The carbon fiber selected is soft in texture, with a density close to that of bamboo bundles, and is easy to press;

[0109] S2, immersing the carbon fiber in a 2% silane coupling agent KH550 solution for 20 minutes for surface activation treatment, which is beneficial to improving the bonding strength between the carbon fiber and the bamboo bundle;

[0110] S3. The approximate amount of the purchased carbon fiber mentioned above is calculated by the following formula:

[0111] in, is the mass of the required carbon fiber bundle, is the density of the carbon fiber bundle, Target density for hybrid high performance fiber reconstituted bamboo, Target volume of hybrid high performance fiber reconstituted bamboo, is the mass ratio of carbon fiber to bamboo bundle.

[0112] (3) Impregnation with phenolic resin:

[0113] The bamboo bundles and carbon fiber bundles are respectively immersed in phenolic resin for 10 to 30 minutes, and then taken out and drained for later use.

[0114] (4) Second drying

[0115] The dipped bamboo bundles and carbon fiber bundles are placed in a drying oven for drying at a constant temperature of 40°C to 60°C. After drying, the moisture content of the bamboo bundles and carbon fiber bundles reaches 8% to 12%.

[0116] (5) Histoblast

[0117] S1. Pre-press the dried bamboo bundles at a pressure of 0.4-0.6 MPa to flatten the bamboo bundles. This is to ensure that the bamboo bundles have obvious stratification when they are assembled, which is convenient for laying the carbon fiber bundles.

[0118] S2. Divide the mass of the bamboo bundle calculated in the second step into n-1 parts, where n is the number of layers to be laid, and then lay the divided carbon fiber bundles evenly on the bamboo bundles along the grain or across the grain. Figure 4 , see the schematic diagram of horizontal paving Figure 5 .

[0119] (6) Hot pressing

[0120] The fiber bamboo bundle mixed preform after embryo assembly is sent to the hot press for hot pressing. The hot pressing temperature is 125-155℃, the hot pressing pressure is 10MPa, and the hot pressing is carried out for 25 minutes. The dimensions of the new reconstituted bamboo board after pressing are: 1930mm long, 1300mm wide, 20mm thick, and the density is 1.0-1.3g / cm3.

[0121] (7) Maintenance

[0122] The pressed new reconstructed bamboo board is placed at room temperature for 2-3 weeks to obtain a mixed high-performance fiber reconstructed bamboo board.

[0123] Example 3

[0124] The difference from Example 2 lies in step (5).

[0125] (5) Histoblast

[0126] S1. Pre-press the dried bamboo bundles at a pressure of 0.4-0.6 MPa to flatten the bamboo bundles. This is to ensure that the bamboo bundles have obvious stratification when they are assembled, which is convenient for laying the carbon fiber bundles.

[0127] S2. Divide the mass of the bamboo bundle calculated in the second step into n-1 parts, where n is the number of layers to be laid. Then cut the divided carbon fiber bundles into 40mm long short carbon fibers, and then evenly and randomly spread them on the bamboo bundles. See the schematic diagram of short carbon fiber laying for details. Figure 6 .

[0128] The mechanical properties of the reconstructed bamboo prepared in the above examples were compared, and the performance was measured according to the current standards and specifications for reconstructed bamboo, namely "Reconstructed for Structural Use" (LY / T 3194-2020). The control group was a common production method without adding carbon fiber. The bamboo pieces were decomposed into bamboo bundles, soaked in phenolic resin glue, dried, assembled, and pressed. The specific process was the same as in Example 1.

[0129] as follows:

[0130]

[0131] Note: The mass ratio of bamboo bundle to carbon fiber in the examples in the table is 100:5.

[0132]

[0133] Note: The mass ratio of bamboo bundle to carbon fiber in the examples in the table is 100:10.

[0134]

[0135] Note: The mass ratio of carbon fiber to bamboo bundle in the examples in the table is 100:15.

[0136] In the above table, along-the-grain laying means that the carbon fiber bundles are laid on the bamboo bundles along the grain, and orthogonal laying means that the carbon fiber bundles are evenly laid on the bamboo bundles transverse to the grain.

[0137] Similar conclusions were drawn for the parallel-grain laying in Example 1 and Example 2. In the parallel-grain performance test, when the mass ratio of bamboo bundle to carbon fiber was 100:5, all performance parameters were significantly improved, among which the tensile modulus was significantly improved compared with the control group, by about 59.63% and 58.53%, respectively. Moreover, as the mass ratio of carbon fiber increased, the mechanical properties in the parallel-grain direction were further improved. This shows that the addition of carbon fiber effectively improves the performance parameters of the reconstructed bamboo in the parallel-grain direction. It also shows from the side that the carbon fiber is evenly mixed in the reconstructed bamboo through pasting, embryo assembly, etc., which effectively improves the bonding performance of the composite material, achieves a better collaborative effect, makes full use of the mechanical properties of the fiber, and effectively improves the bearing capacity and stiffness of the reconstructed bamboo. There is basically no obvious change in the mechanical properties in the transverse direction.

[0138] In the cross-grain performance test of the orthogonal laying in Example 2, each performance parameter has been significantly improved, among which the tensile strength, tensile modulus and compressive modulus are greatly improved compared with the control group, respectively increasing by about 528.44%, 557.34% and 518.77%. The mechanical properties in the direction of the grain are slightly reduced, but the excellent mechanical properties can still be maintained. And with the increase of the mass ratio of carbon fiber to bamboo bundle, the mechanical properties in the cross-grain direction are closer to the mechanical properties in the cross-grain direction. The conclusion shows that the orthogonal arrangement of carbon fiber and bamboo bundle when forming embryos can greatly reduce the anisotropy of the reconstructed bamboo to cope with a more complex mechanical environment.

[0139] The random arrangement of short fibers in Example 3 can improve the mechanical properties of reconstructed bamboo in each direction. However, compared with the parallel and cross-grain laying of long fibers, the performance improvement of random short fiber laying is still somewhat lower, but it still has certain utilization value.

[0140] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0141] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid high-performance fiber reconstructed bamboo, characterized in that: The hybrid high-performance fiber reconstructed bamboo comprises bamboo bundles and high-performance fibers; The bamboo bundle and the high-performance fiber embryo form a fiber bamboo bundle mixed preform, and the fiber bamboo bundle mixed preform is pressed to form a mixed high-performance fiber reconstituted bamboo.

2. The hybrid high-performance fiber reconstructed bamboo according to claim 1, characterized in that: The high-performance fiber is a fiber impregnated with a silane coupling agent.

3. The hybrid high-performance fiber reconstructed bamboo according to claim 1, characterized in that: The fiber bamboo bundle mixed preform The preparation method is as follows: bamboo bundles and high-performance fiber embryos are pasted together and then embryos are formed; Alternatively, bamboo bundles and high-performance fibers are laid alternately to form the embryo.

4. A method for preparing a hybrid high-performance fiber reconstructed bamboo, characterized in that: The preparation method comprises: The high-performance fiber is immersed in a silane coupling agent for surface activation treatment to obtain a pretreated high-performance fiber; The bamboo bundle and the pretreated high-performance fiber are impregnated with phenolic resin respectively, and then dried; The dried bamboo bundles and high-performance fibers are combined to form a fiber-bamboo bundle hybrid preform; The fiber bamboo bundle mixed preform is pressed to obtain the mixed high-performance fiber reconstituted bamboo.

5. The method for preparing the hybrid high-performance fiber reconstructed bamboo according to claim 4, characterized in that: The preparation method of the bamboo bundle is as follows: The original bamboo is cut into bamboo strips, and the green and yellow parts are removed to form bamboo bundles.

6. The method for preparing the hybrid high-performance fiber reconstructed bamboo according to claim 4, characterized in that: The method for forming a fiber-bamboo-bundle hybrid preform by combining the bamboo bundle and the high-performance fiber is as follows: The bamboo bundles and high-performance fibers are pasted together and then assembled.

7. The method for preparing the hybrid high-performance fiber reconstructed bamboo according to claim 4, characterized in that: The method for forming the fiber-bamboo-bundle mixed preform by combining the bamboo bundles and the high-performance fibers is as follows: the bamboo bundles and the high-performance fibers are laid alternately to form the preform.

8. The method for preparing the hybrid high-performance fiber reconstructed bamboo according to claim 7, characterized in that: Pre-press and flatten the dried bamboo bundles; The dried high-performance fiber is evenly laid on the bamboo bundle along the grain or across the grain; Then, bamboo bundles are evenly laid on the surface of the high-performance fiber along the grain or across the grain; The bamboo bundles and the high-performance fibers are laid alternately in sequence to form a fiber-bamboo-bundle mixed preform.

9. The method for preparing the hybrid high-performance fiber reconstructed bamboo according to claim 4, characterized in that: After impregnation of phenolic resin The bamboo bundles and pre-treated high performance fibers are dried to a moisture content of 10%-12%.

10. The method for preparing the hybrid high-performance fiber reconstructed bamboo according to claim, characterized in that: The bamboo bundle and the pretreated high-performance fiber are respectively impregnated with phenolic resin, and the impregnation amount is 6%-10%.

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