Bamboo bundle plate and preparation method thereof

Abstract

The invention provides a bamboo bundle plate and a preparation method thereof. The preparation method of the bamboo bundle plate comprises the steps that (1) a functional modifier is applied to plant tissue for modification, then drying is conducted, modified plant tissue is obtained, and the plant tissue comprises granular plant tissue and / or fibrous plant tissue; (2) respectively applying glue to the modified plant tissues and the bamboo bundles, and then drying to respectively obtain glue-applied modified plant tissues and glue-applied bamboo bundles; and (3) applying the sizing modified plant tissue to the surface of the sizing bamboo bundle, and then performing hot pressing to obtain the bamboo bundle plate. By means of the method, the surface flatness and smoothness of the board can be remarkably improved, meanwhile, the bamboo bundle board is endowed with the surface application functions of mildew prevention, flame retardance and the like, and therefore dependence on the later treatment process is reduced, and the production procedure is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of bamboo processing, and particularly relates to a bamboo bundle board and a preparation method thereof. Background Art

[0002] For the surface treatment of boards, the existing technologies mainly focus on post-treatment processes such as coating and veneering. For example, by coating paint or coatings on the board surface to improve the surface hardness, wear resistance and aesthetics; or using veneering technology to attach decorative thin boards (such as melamine boards) to the board surface to achieve the purpose of aesthetics and protection. However, these surface treatment technologies have some problems. The coating process may release volatile organic compounds (VOCs), which have a certain impact on the environment and human health; the veneering technology may cause the veneer to fall off due to reasons such as the aging of the adhesive, and the combination of these surface treatment methods with the internal structure of the board is not tight enough, and surface damage is likely to occur during long-term use.

[0003] In the manufacture of bamboo-based boards with bamboo bundles as the basic unit, the current treatment mainly focuses on the construction of its internal structure, but there is a lack of innovation in the surface treatment of bamboo forming units. Because bamboo bundles have pores and different tissue forms, the surface of the pressed bamboo-based board is uneven. The existing surface treatment technologies for bamboo bundle boards often simply perform grinding and sanding to improve the surface flatness. On the one hand, secondary treatment methods such as grinding and polishing will undoubtedly increase the manufacturing process and raise the production cost. Secondly, the improvement of flatness by polishing and grinding methods is not particularly significant. Similarly, in order to improve other properties of bamboo bundles, such as wear resistance and mildew resistance, paint is applied to the surface of the bamboo bundle board, and a coating is formed on the surface to achieve the purpose of functionalization. However, due to the uneven surface of the bamboo bundle board itself, the coating is easy to fall off and the effect may not be ideal.

[0004] Therefore, how to achieve the flatness of the surface of bamboo bundle boards in a simple way and endow bamboo bundle boards with other functions is a very important task. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems in the prior art to some extent. To this end, an object of the present invention is to provide a bamboo bundle board and a preparation method thereof.

[0006] In the first aspect of the present invention, a preparation method of a bamboo bundle board is provided, the method comprising: (1) Applying a functional modifier to plant tissue for modification and then drying to obtain modified plant tissue, wherein the plant tissue includes granular plant tissue and / or fibrous plant tissue; (2)Apply glue to the modified plant tissue and bamboo bundles respectively and then dry them to obtain sized modified plant tissue and sized bamboo bundles respectively. (3)Apply the sized modified plant tissue on the surface of the sized bamboo bundles, and then perform hot pressing to obtain bamboo bundle boards.

[0007] According to the above preparation method of bamboo bundle boards of the present invention, the granular plant tissue and / or fibrous plant tissue are modified by a functional modifier to endow them with certain functions, such as mildew-proof function, flame-retardant function, etc. Then, glue is applied to the modified plant tissue and bamboo bundles respectively and dried, and then the sized modified plant tissue is applied on the surface of the sized bamboo bundles and hot pressed. By applying glue, the modified plant tissue and bamboo bundles can form an integral bamboo bundle board. Because there are certain pores in the bamboo bundles themselves, during the hot pressing process, the modified plant tissue fills the pores on the surface of the bamboo bundles. After hot pressing, the modified plant tissue is denser and more evenly distributed, thus forming a smooth modified plant tissue layer on the surface of the bamboo bundles, effectively solving the problem of low surface flatness of bamboo bundle boards. At the same time, the inventor found that the modified plant tissue layer formed on the surface of the bamboo bundles by using the modified plant tissue can not only endow the bamboo bundle boards with certain functions (such as mildew-proof function, flame-retardant function, etc.), but also due to the modification of the plant tissue, the plant tissue is more firmly embedded in the pores of the bamboo bundles. Compared with the traditional method of coating the surface of bamboo bundle boards, the modified plant tissue layer formed by the present invention is difficult to fall off from the bamboo bundles, thus significantly extending the service life of the boards.

[0008] According to the preparation method of bamboo bundle boards provided by the present invention, in step (1), the mesh number of the granular plant tissue is 20 - 200 meshes. By controlling the mesh number of the plant tissue to be 20 - 200 meshes, it can be better embedded in the pores of the bamboo bundles to form a dense and uniform surface layer of the bamboo bundle boards.

[0009] According to the preparation method of bamboo bundle boards provided by the present invention, in step (1), the beating degree of the pulp formed by the fibrous plant tissue is 5 - 50°SR. Controlling the beating degree of the pulp formed by the fibrous plant tissue within the above range can be better embedded in the pores of the bamboo bundles to form a dense and uniform surface layer of the bamboo bundle boards.

[0010] It should be noted that the plant tissue includes bamboo tissue or other wood tissues, preferably bamboo tissue. No special limitation is made on the morphology of the bamboo / wood tissue. For example, the tissue morphology can be powdery, fibrous, flocculent, filamentous, granular, etc., and the tissue types can be fibers, fiber bundles, parenchyma cells, miscellaneous cells, etc. and their mixtures.

[0011] According to the preparation method of bamboo bundle boards provided by the present invention, in step (1), the plant tissue includes unsized plant tissue and / or sized plant tissue.

[0012] In some embodiments of the present invention, the sizing plant tissue is obtained by crushing the sizing plant.

[0013] Preferably, the sizing plant is selected from sizing bamboo materials. Further, the applied bamboo materials include sizing bamboo lumber and / or sizing bamboo bundles.

[0014] According to the method for preparing bamboo bundle board provided by the present invention, in step (1), the modifier is selected from one of a mildew-proof functional modifier and a flame-retardant functional modifier. By using a mildew-proof functional modifier to modify the plant tissue, the plant tissue is given a certain mildew-proof effect, thereby endowing the bamboo bundle board with a mildew-proof function. At the same time, the bonding strength between the plant tissue and the bamboo bundle is improved, and the service life of the bamboo bundle board is extended. By using a flame-retardant functional modifier to modify the plant tissue, the plant tissue is given a certain flame-retardant effect, thereby endowing the bamboo bundle board with a flame-retardant function. At the same time, the bonding strength between the plant tissue and the bamboo bundle is improved, and the service life of the bamboo bundle board is extended.

[0015] Preferably, the mildew-proof functional modifier includes one or more of quaternary ammonium salt modifiers, isothiazolinone modifiers, triazole modifiers, nano-silver modifiers, and nano-zinc oxide modifiers.

[0016] As an example, quaternary ammonium salt modifiers include dodecyl dimethyl benzyl ammonium chloride, ammonia-soluble quaternary ammonium copper, dicetyl dimethyl ammonium chloride, ditridecyl dimethyl ammonium chloride, and their mixtures, etc.; isothiazolinone modifiers include isothiazolinone, methyl chloro isothiazolinone, methyl isothiazolinone, and their mixtures, etc.; triazole modifiers include tebuconazole, difenoconazole, propiconazole, etc.

[0017] Preferably, the flame-retardant functional modifier includes one or more of phosphorus-based flame retardants, phosphorus-nitrogen-boron composite flame retardants, metal hydroxide flame retardants, and resin flame retardants.

[0018] As an example, phosphorus-based flame retardants include ammonium dihydrogen phosphate, trisodium phosphate, ammonium polyphosphate, etc.; phosphorus-nitrogen-boron composite flame retardants include boron-based flame retardants such as boric acid and borax compounded with phosphorus-based flame retardants; metal hydroxide flame retardants include aluminum hydroxide, magnesium hydroxide, iron hydroxide, etc.

[0019] According to the method for preparing bamboo bundle board provided by the present invention, the drug loading amount of the mildew-proof functional modifier is 0.05 - 1.0 kg / m 3 , that is, the addition amount of the mildew-proof functional modifier in the plant tissue per unit volume. When the drug loading amount of the mildew-proof functional modifier is within the above range, it can ensure that the mildew-proof agent endows the plant tissue with mildew-proof performance, and a better mildew-proof effect can be achieved on the surface of the bamboo bundle in the bamboo bundle board.

[0020] In some embodiments of the present invention, the mildew-proof functional modifier is applied to the plant tissue by means such as impregnation, spraying, etc., and it is only necessary to make the modifier evenly adhere to the plant tissue. Further, the plant tissue after applying the mildew-proof functional modifier is dried again to a moisture content of 5-10% for standby.

[0021] According to the method for preparing the bamboo bundle board provided by the present invention, the application amount of the flame-retardant functional modifier is 20%-40% of the mass of the plant tissue, such as 20%, 25%, 30%, 35%, 40%, etc., or the range between any two of the above values. By controlling the application amount of the flame-retardant functional modifier within the above range, it can ensure that the flame retardant imparts flame-retardant properties to the plant tissue, and a better flame-retardant effect can be achieved on the surface of the bamboo bundles in the bamboo bundle board.

[0022] In some embodiments of the present invention, the flame-retardant functional modifier is applied to the plant tissue by means such as impregnation, spraying, etc., and it is only necessary to make the modifier evenly adhere to the plant tissue. Further, the plant tissue after applying the flame-retardant functional modifier is dried again to a moisture content of 5-10% for standby.

[0023] According to the method for preparing the bamboo bundle board provided by the present invention, in step (2), the application amount of the glue for the modified plant tissue is 5%-10% of the mass of the modified plant tissue.

[0024] In some embodiments of the present invention, after the modified plant tissue is applied with glue, it is dried to a moisture content of 5% - 15% for standby. At the same time, the modified plant tissue after sizing still remains in its original state such as powdery, fibrous, flocculent, filamentous, granular, etc.

[0025] In some embodiments of the present invention, in step (2), the method for applying glue to the bamboo bundles is: immersing the bamboo bundles in the glue for 10-20 min. Further, after the sizing of the bamboo bundles is completed, they are dried at 65°C to a moisture content of 10% - 15%.

[0026] In some embodiments of the present invention, the glue includes one or more of phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, protein adhesive, polyurethane adhesive, epoxy resin, inorganic adhesive.

[0027] Preferably, the glue applied to the modified plant tissue is the same as the glue applied to the bamboo bundles. Keeping the glue applied to the modified plant tissue and the bamboo bundles consistent can ensure the interfacial bonding strength between the modified plant tissue and the basic unit of the bamboo bundles.

[0028] In some embodiments of the present invention, in step (2), the stiffness of the bamboo bundles is 60-220 kg / m. Controlling the stiffness of the bamboo bundles to be 60-220 kg / m can ensure that the bamboo bundles are properly defibrated, which is beneficial for the filling of the modified plant tissue in the bamboo bundles.

[0029] In some embodiments of the present invention, in step (3), the application amount of the sizing-modified plant tissue on the sized bamboo bundles is 1000-7000 kg / m 3 . Controlling the application amount of the sizing-modified plant tissue on the sized bamboo bundles within the above range can ensure that the thickness of the board is appropriate, and there will be no cracking, wire jumping, etc. after post-treatment of the board such as sanding, and the production cost of the board is reduced.

[0030] In some embodiments of the present invention, a paving device is used to lay the sizing-modified plant tissue on the sized bamboo bundles. The paving device includes components such as a paving head, a sensor, and a flow controller. The sensor is used to detect information such as the surface shape and position of the bamboo bundle forming unit, and then feedback this information to the control system. The flow controller accurately controls the paving amount and paving position of plant tissues of different shapes according to the feedback information of the sensor. Reference can be made to Figure 1 , and the paving process is as follows: Under the action of the paving head control unit, the modified plant tissue is accurately paved on the surface of the basic bamboo bundle forming unit. The inside of the paving head adopts a partition structure, and different partitions can separately process plant tissue units of different forms such as powdery, granular, flocculent, filamentous, and fibrous, to avoid mutual interference between two forms of plant tissue during the paving process. Each partition has an independent feeding channel and a flow control device to ensure accurate paving. A basic unit of a bamboo board with the modified plant tissue paved on its surface is obtained, and the modified plant tissue has been paved on its surface as required, preparing for the subsequent pressing process.

[0031] In some embodiments of the present invention, a primary pressing is performed under the set pressing temperature, pressure, and time parameters. The pressing parameters are consistent with the process of composite forming of the basic unit of the bamboo bundle board. During the pressing process, the modified plant tissue is tightly combined with the surface of the basic bamboo bundle forming unit under the action of pressure and temperature. At the same time, the plant tissues are also combined with each other to form an integral board structure, so that the board can achieve good surface performance and target functions after a single pressing. After pressing, cutting, etc. are carried out as required to make the board meet the final size and shape requirements, and finally a bamboo board with good surface performance and target functionality is obtained for application in high-value board application fields.

[0032] In some embodiments of the present invention, in step (3), the temperature of the hot pressing is not lower than the thermal curing temperature of the glue. Preferably, the temperature of the hot pressing is 10 - 30°C higher than the thermal curing temperature of the glue. For example, when the glue used for the bamboo bundle board basic unit is phenolic resin as the adhesive, the pressure for hot pressing forming is 1 MPa to 25 MPa, the pressure holding time is 5 min to 50 min, and the pressure holding temperature is 135°C to 155°C. When different adhesives and different board thicknesses are selected, flexible adjustment can be made according to the curing temperature and curing time of the selected glue.

[0033] In the second aspect of the present invention, the present invention provides a bamboo bundle board. The bamboo bundle board is prepared by the above method. The surface of the bamboo bundle board is flat and has high smoothness, has excellent mildew-proof function or flame-retardant function, and at the same time has a long service life.

[0034] The present invention has at least the following technical effects: By first modifying the plant tissue and then paving it on the surface of the bamboo bundle and pressing it into a board at one time, the present invention significantly improves the surface properties such as the surface flatness and smoothness of the board, and at the same time endows the bamboo bundle board with surface application functions such as mildew-proof and flame-retardant, thereby reducing the dependence on post-treatment processes (such as coating mildew-proof coatings, etc.), and thus simplifying the production process.

[0035] Traditional pressing techniques fail to effectively integrate the surface treatment techniques such as the modification and paving of plant tissue with the pressing process. The present invention makes full use of the distribution of the modified plant tissue on the surface of the bamboo forming unit to achieve pressing into a board at one time and simultaneously achieve good surface properties and target functions, thereby improving production efficiency and meeting the requirements of high-performance bamboo-based boards.

[0036] Compared with the traditional coating process, the modified plant tissue layer formed on the bamboo bundle in the present invention has a strong binding force and is difficult to fall off from the bamboo bundle, thereby improving the service life of the board. At the same time, the plant tissue used in the present invention can be waste materials in the process of board preparation or other easily available plant tissues, with environmentally friendly raw materials, realizing the full utilization of waste materials, significantly reducing production costs, and improving resource utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1Schematic diagram of the process of laying sizing-modified plant tissue on sized bamboo bundles according to an embodiment of the present invention; Figure 2 Physical and electron microscope images of the surface mold-proof modified bamboo bundle laminated board of Embodiment 1 of the present invention; Figure 3 Physical and electron microscope images of the bamboo bundle laminated board of Comparative Example 1 of the present invention. Detailed implementation manners

[0039] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. The present invention will be described below with reference to specific embodiments. It should be noted that these embodiments are only illustrative and do not limit the present invention in any way.

[0040] Embodiment 1 Surface mold-proof modified bamboo bundle laminated board (1) Bamboo powder mold-proof modification: Propiconazole, tebuconazole, and iodopropargyl n-butylcarbamate composite mold-proof agent (the mass ratio of the three is 1:1:1) is used to perform mold-proof treatment on 100-mesh bamboo powder. The drug loading amount of the mold-proof modifier is 0.60 kg / m 3 , and the bamboo powder impregnated with the mold-proof agent is dried again to a moisture content of 10% for standby; (2) Sizing of modified bamboo powder: The bamboo powder treated with the mold-proof agent is mixed with phenolic resin glue and stirred evenly. The sizing amount is 8%. The sized bamboo powder is dried to a moisture content of 10% for standby; (3) Sizing of bamboo bundle curtain: Bamboo is processed by a rolling and defibrating machine into bamboo bundles. The stiffness of the formed bamboo bundles is 160 kg / m. Then the bamboo bundles are horizontally linked and woven into a whole bamboo bundle curtain and dried. The dried bamboo bundle curtain is impregnated in phenolic resin for 15 min and then drained, and dried at 65 °C to a moisture content of 10%; (4) Blanket laying and paving: Three layers of the above-mentioned impregnated bamboo bundle curtains are laminated and paved. The sized mold-proof modified bamboo powder is evenly paved on the surface of the surface layer bamboo bundle curtain. The paving thickness of the bamboo powder is 3 mm (the application amount of the sized modified bamboo powder on the surface layer bamboo bundle curtain is 2500 kg / m 3 ).

[0041] (5) Hot pressing and forming: It is formed by a "cold in - cold out" hot pressing process with a hot pressing temperature of 145 °C, a pressure of 19 MPa, a pressure holding time of 20 min, and a cooling time of 20 min, and hot pressed and formed with a specified thickness of 6 mm.

[0042] Embodiment 2 Surface flame-retardant modified bamboo bundle laminated board (1)Flame retardant modification of bamboo powder: 100-mesh bamboo powder was impregnated in an aqueous solution of trisodium phosphate with a mass fraction of 10% for 1 h for flame retardant treatment, and then dried to a moisture content of 10% for standby. The application amount of the flame retardant in the bamboo powder was 30%; (2)Sizing of modified bamboo powder: The bamboo powder treated with the flame retardant was mixed with phenolic resin glue and stirred evenly. The sizing amount was 8%, and the sized bamboo powder was dried to a moisture content of 10% for standby; (3)Sizing of bamboo curtain: The same as in Example 1; (4)Laminating and laying: Three layers of the above-mentioned sized bamboo curtains were laminated and laid. The sized flame retardant modified bamboo powder was evenly laid on the surface of the surface layer bamboo curtain. The laying thickness of the bamboo powder was 3 mm (the application amount of the sized modified bamboo powder on the surface layer bamboo curtain was 2500 kg / m 3 ).

[0043] (5)Hot pressing and forming: The same as in Example 1.

[0044] Example 3 Surface mildew-proof modified bamboo laminate (1)Mildew-proof modification of bamboo fiber: A compound mildew-proof agent of propiconazole, tebuconazole, and iodopropargyl n-butylcarbamate (the mass ratio of the three is 1:1:1) was used to treat 20°SR bamboo fiber for mildew-proof treatment. The drug loading amount of the mildew-proof modifier was 0.60 kg / m 3 , and the bamboo fiber impregnated with the mildew-proof agent was dried again to a moisture content of 10% for standby; (2)Sizing of modified bamboo fiber: The bamboo fiber treated with the mildew-proof agent was mixed with phenolic resin glue and stirred evenly. The sizing amount was 8%, and the sized bamboo fiber was dried to a moisture content of 10% for standby; (3)Sizing of bamboo curtain: The same as in Example 1; (4)Laminating and laying: Three layers of the above-mentioned sized bamboo curtains were laminated and laid. The sized modified bamboo fiber was evenly laid on the surface of the surface layer bamboo curtain. The laying thickness of the bamboo fiber was 3 mm (the application amount of the sized modified bamboo powder on the surface layer bamboo curtain was 2500 kg / m 3 ).

[0045] (5)Hot pressing and forming: The same as in Example 1.

[0046] Example 4 Surface flame retardant modified bamboo laminate (1)Flame retardant modification of bamboo fiber: Bamboo fiber with a beating degree of 20°SR was impregnated in an aqueous solution of trisodium phosphate with a mass fraction of 10% for 1 h for flame retardant treatment, and then dried to a moisture content of 10% for standby. The application amount of the flame retardant in the bamboo fiber was 30%; (2) Sizing of modified bamboo fibers: The bamboo fibers treated with the flame retardant are mixed with phenolic resin glue and stirred evenly. The sizing amount is 8%. The sized bamboo fibers are dried to a moisture content of 10% for standby. (3) Sizing of bamboo bundle curtains: The same as in Example 1. (4) Blanket laying and assembly: Three layers of the above-mentioned sized bamboo bundle curtains are laminated and assembled. The sized flame-retardant modified bamboo fibers are evenly laid on the surface of the surface bamboo bundle curtain. The laying thickness of the bamboo fibers is 3 mm (the application amount of the sized modified bamboo powder on the surface bamboo bundle curtain is 2500 kg / m 3 )

[0047] (5) Hot pressing and forming: The same as in Example 1.

[0048] Comparative Example 1 Preparation of bamboo bundle laminated board (without bamboo and wood tissue on the surface): (1) Preparation of bamboo bundle curtain: The bamboo is defibrated into bamboo bundles by a rolling defibrator. The stiffness of the defibrated bamboo bundles is 160 kg / m. Then the bamboo bundles are horizontally linked and woven into a whole bamboo bundle curtain and dried. The thickness of the dried single bamboo bundle curtain is about 3 mm.

[0049] (2) Sizing of bamboo bundle curtain: The dried bamboo bundle curtain is immersed in phenolic resin for 15 minutes and then drained, and dried at 65°C to a moisture content of 15%. (3) Blanket laying, assembly, hot pressing and forming: Three layers of the above-mentioned sized bamboo bundle curtains are laminated and assembled. It is formed by a hot pressing process of "cold in - cold out" with a hot pressing temperature of 145°C, a pressure of 19 MPa, a pressure holding time of 20 minutes, and a cooling time of 20 minutes, and hot pressed and formed to a specified thickness of 6 mm.

[0050] Comparative Example 2 Preparation of bamboo bundle laminated board with flame-retardant coating on the surface: (1) Sizing of bamboo bundle curtain: The same as in Example 1. (2) Blanket laying, hot pressing and forming: The same as in Comparative Example 1.

[0051] (3) Surface flame-retardant coating: Sodium phosphate flame-retardant coating is evenly sprayed on the surface of the hot-pressed and formed board, with a total of three layers coated. The single-layer coating amount of the coating is 400 g / m 2 .

[0052] Comparative Example 3 Preparation of bamboo bundle laminated board with mildew-proof coating on the surface: (1) Sizing of bamboo bundle curtain: The same as in Example 1. (2) Blanket laying, hot pressing and forming: The same as in Comparative Example 1.

[0053] (3)Surface anti - mildew finishing: Uniformly spray a composite anti - mildew coating of propiconazole, tebuconazole, and iodopropynyl butylcarbamate on the surface of the board after hot - pressing and forming. A total of three layers are coated, and the single - layer coating amount of the coating is 400 g / m 2 .

[0054] Test the properties of the bamboo - based boards prepared in Examples 1 - 4 and Comparative Examples 1 - 3. The specific methods are as follows: (1)Surface flatness: Use a super - depth - of - field microscope or a white - light interference profilometer to measure the surface roughness (arithmetical mean height of surface Sa) to represent the surface flatness degree according to the test method of ISO 25178; (2)Test the anti - mildew performance of the bamboo - based board according to the test method of LY / T 2230 - 2013; (3)Test the flame - retardant performance of the bamboo - based board according to the test method of ISO 5660 - 1 standard; (4)Interface bonding ability: Test the adhesion of surface bamboo powder according to the test method of ASTM D 3359 - 2002 standard; (5)Aging method of bamboo - based board: Refer to the GB / T 30364 - 2024 standard for boiling - drying - boiling aging cycle. The specific process is that the board is immersed in boiling water for 4 h, taken out and directly separated and laid flat in a drying oven at (63 ± 3)°C for 20 h, and then immersed in boiling water for 4 h. The performance test results of the bamboo - based boards prepared in Examples 1 - 4 and Comparative Examples 1 - 3 are shown in Table 1.

[0055] Table 1

[0056] It can be seen from the data in Table 1 that the bamboo - bundle boards of the present invention have excellent anti - mildew and flame - retardant properties, and at the same time have excellent surface flatness and interface bonding stability. The surface of the board can still remain flat and the surface functionalization effect can still be maintained after the board is aged. Combining Figure 2 and Figure 3 it can be known that there are a large number of gaps on the surface of the unlaid modified - bamboo - powder bamboo - bundle board, and bamboo structures such as bamboo parenchyma cells and fiber cells can be seen on the surface. Compared with the unlaid - bamboo - powder bamboo - bundle board, after the modified bamboo powder is laid on the surface of the bamboo - bundle board and hot - pressed, it is evenly distributed on the surface of the bamboo - bundle board. There are no obvious defects such as voids and wire skipping on the surface of the board. At the microscopic level, only the modified bamboo powder can be seen on the surface of the bamboo - bundle board, and it is completely evenly covered by the modified bamboo powder. The laying of the modified bamboo powder on the surface of the bamboo - bundle laminated veneer lumber not only improves the surface flatness of the board, but also the modifiers added to the bamboo powder can be evenly distributed and firmly bonded on the surface of the bamboo - bundle board, playing a better protective role.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a bamboo bundle board, characterized in that: include: (1) applying a functional modifier to plant tissue for modification and then drying to obtain modified plant tissue, wherein the plant tissue includes granular plant tissue and / or fibrous plant tissue; (2) applying glue to the modified plant tissue and the bamboo bundle respectively and then drying them to obtain glue-applied modified plant tissue and glue-applied bamboo bundle respectively; (3) applying the sizing modified plant tissue on the surface of the sizing bamboo bundle, and then hot pressing to obtain a bamboo bundle board.

2. The method according to claim 1, characterized in that: In step (1), the mesh size of the granular plant tissue is 20-200 mesh; And / or, the pulp formed by using the fibrous plant tissue has a beating degree of 5-50°SR.

3. The method according to claim 1 or 2, characterized in that: In step (1), the plant tissue includes un-glued plant tissue and / or glued plant tissue; The glue-applying plant tissue is obtained by crushing the glue-applying plant; Preferably, the sizing plant is selected from sizing bamboo material.

4. The method according to claim 1 or 2, characterized in that: In step (1), the functional modifier is selected from a mildew-proof functional modifier and a flame-retardant functional modifier; Preferably, the anti-mildew functional modifier includes one or more of quaternary ammonium salt modifiers, isothiazolinone modifiers, triazole modifiers, nano silver modifiers, and nano zinc oxide modifiers; Preferably, the flame retardant functional modifier includes one or more of a phosphorus flame retardant, a phosphorus-nitrogen-boron composite flame retardant, a metal hydroxide flame retardant and a resin flame retardant.

5. The method according to claim 4, characterized in that: The drug loading of the anti-mildew functional modifier is 0.05-1.0 kg / m 3 ; And / or, the application amount of the flame retardant functional modifier is 20%-40% of the mass of the plant tissue.

6. The method according to claim 1, characterized in that: In step (2), the amount of glue applied to the modified plant tissue is 5%-10% of the mass of the modified plant tissue; And / or, the bamboo bundle is applied with glue by immersing the bamboo bundle in the glue for 10-20 minutes.

7. The method according to claim 1 or 6, characterized in that: The glue includes one or more of phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, protein adhesive, polyurethane adhesive, epoxy resin, and inorganic adhesive; Preferably, the glue applied by the modified plant tissue is the same as the glue applied by the bamboo bundles.

8. The method according to claim 1, characterized in that: In step (2), the stiffness of the bamboo bundle is 60-220 kg / m; And / or, in step (3), the amount of the sizing modified plant tissue applied to the sizing bamboo bundle is 1000-7000 kg / m 3 .

9. The method according to claim 1, characterized in that: In step (3), the temperature of the hot pressing is not lower than the thermal curing temperature of the glue; Preferably, the temperature of the hot pressing is 10-30° C. higher than the thermal curing temperature of the glue.

10. A bamboo bundle board, characterized in that: The method is prepared by any one of claims 1 to 9.

Images