A novel preparation method of a bamboo charcoal plate

Abstract

The present application provides a novel preparation method of bamboo charcoal plate, comprising the following steps: S1: combine light calcium powder and heavy calcium powder, mix after fully scattering, use stearic acid to activate the calcium powder after scattering, and prepare activated calcium powder; S2: use anhydrous ethanol to dilute the silane coupling agent, and prepare a coupling agent dilution solution. The novel preparation method of bamboo charcoal plate of the present application utilizes activated calcium powder and silane coupling agent to construct stable chemical bonding at the interface of inorganic bamboo charcoal particles and organic resin matrix, thereby improving the interface bonding strength. At the same time, through the integrated forming process of resin coating pretreatment, atomization coupling surface modification and foaming hot pressing, the overall density of the material is improved, and the nail holding capacity and assembly connection firmness of the bamboo charcoal plate are improved.

Description

Technical Field

[0001] This invention relates to the field of bamboo-based engineered wood processing technology, and in particular to a novel method for preparing bamboo charcoal boards. Background Technology

[0002] Bamboo charcoal board is a new type of environmentally friendly and functional decorative artificial board. It is mainly made of activated bamboo charcoal powder, which is produced by high-temperature and oxygen-deficient carbonization of four-year-old high-quality moso bamboo, as the core raw material. It is combined with bamboo fiber, environmentally friendly resin and special additives, and processed by high-temperature extrusion and precision co-extrusion molding process, which has both structural stability and ecological functionality.

[0003] An existing method for preparing decorative environmentally friendly bamboo charcoal boards involves uniformly dispersing micron-sized bamboo charcoal powder in an aqueous solution using the dispersing function of biomass nanocellulose. After shrinkage and freeze-drying, a uniform bamboo charcoal aerogel is formed, which is then used to prepare bamboo charcoal aerogel particles with uniform diameter. This results in bamboo charcoal boards with uniform density and consistent performance, improving tensile strength and elastic modulus, and addressing the current problems of brittleness and unsatisfactory mechanical properties in bamboo charcoal boards. However, due to the significant differences in physicochemical properties between the inorganic and organic phases, relying solely on biomass nanocellulose for physical coating and bonding leads to low interfacial bonding strength and poor interfacial stability. During screw assembly and tightening, the threaded structure exerts compression and shearing forces on the pore walls and the interface between the two phases, easily causing interfacial debonding and local pore wall structure breakage and collapse. This makes it difficult to achieve a mechanical interlocking anchoring effect, leading to problems such as screw slippage, loose connections, and fixation failure, thus reducing the assembly stability of the bamboo charcoal boards. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the above-mentioned technologies.

[0005] Therefore, one object of the present invention is to propose a novel method for preparing bamboo charcoal boards, which can...

[0006] To achieve the above objectives, the first aspect of this invention proposes a novel method for preparing bamboo charcoal boards, comprising the following steps: S1: Combining light calcium carbonate powder and heavy calcium carbonate powder, thoroughly mixing them, and then activating the mixed calcium carbonate powder with stearic acid to obtain activated calcium carbonate powder; S2: Diluting a silane coupling agent with anhydrous ethanol to obtain a diluted coupling agent solution; S3: Grinding bamboo charcoal raw materials into powder, then sieving and drying them, combining them with the activated calcium carbonate powder obtained in step S1, thoroughly mixing them, and then adding natural resin particles, antioxidants, and PE wax to obtain resin-coated particles; S4: Spraying the diluted coupling agent solution obtained in step S2 into the resin-coated particles obtained in step S3, thoroughly stirring and mixing them, then adding a composite foaming agent and stirring and mixing again to obtain a loose granular composite mixture; S5: According to the weight of the target board, laying the loose granular composite mixture obtained in step S4 into a hot press mold, and pressing it into bamboo charcoal boards under high temperature and high pressure.

[0007] In addition, the novel preparation method of bamboo charcoal board proposed according to the present invention may also have the following additional technical features:

[0008] Specifically, step S1 includes the following operations: placing light calcium carbonate powder and heavy calcium carbonate powder in a mixer and dispersing them at a speed of 400-550 r / min for 2-6 minutes; then raising the temperature of the mixer to 100-110℃, adding stearic acid, and stirring at a speed of 600-750 r / min for 7-10 minutes; after thorough mixing, cooling is performed to obtain activated calcium carbonate powder.

[0009] Specifically, step S2 includes the following operations: the silane coupling agent and anhydrous ethanol are combined in a mass ratio of 1:9 and added to a magnetic stirring reaction device. The mixture is then magnetically stirred for 4-8 minutes at a temperature of 20-30°C and a rotation speed of 180-220 r / min to obtain a diluted coupling agent solution.

[0010] Specifically, step S3 includes the following operations: crushing the bamboo charcoal raw material in a hammer mill and sieving it through a 300-1200 mesh standard sieve; then placing the sieved bamboo charcoal powder in an oven and drying it at a constant temperature of 75-85℃ for 5-7 hours; then placing the bamboo charcoal powder with a moisture content of 1.0%-2.5% in a high-speed mixer, adding activated calcium powder, and premixing it at a speed of 250-350 r / min; adding natural rosin resin particles, antioxidants, and PE wax to the premixed raw material, and stirring it at a temperature of 105-112℃ and a speed of 8000-10000 r / min to obtain resin-coated particles.

[0011] Specifically, step S4 includes the following operations: placing the resin-coated particles in a high-speed mixer, preheating them at a temperature of 55-75°C and a rotation speed of 2500-3500 r / min, then spraying the coupling agent dilution solution onto the surface of the resin-coated particles under an atomization spraying pressure of 0.2-0.4 MPa, mixing thoroughly, cooling to room temperature, adding the composite foaming agent, and stirring at a rotation speed of 250-350 r / min to obtain a loose granular composite mixture.

[0012] Specifically, step S5 includes the following operations: the predetermined density of the bamboo charcoal board is 0.42-0.85 g / cm3. The loose granular composite mixture is weighed, then spread evenly in a hot press mold, and hot-pressed at 2.2-2.8 MPa within a temperature range of 125-160℃. The board is then cooled to 40-65℃ and unloaded to obtain the desired bamboo charcoal board.

[0013] Specifically, the silane coupling agent is any one or a combination of KH-550 type aminosilane coupling agent, KH-560 type epoxysilane coupling agent, and KH-570 type vinylsilane coupling agent.

[0014] Specifically, the antioxidant is one or more of antioxidant 1010, antioxidant 1076, and antioxidant 264.

[0015] Specifically, the PE wax is high-density polyethylene micro powder wax with a powder mesh size of 200-450 mesh.

[0016] Specifically, the composite foaming agent is a low-temperature organic composite foaming agent, which is composed of azodicarbonamide and sodium bicarbonate in a mass ratio of 2:1.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The novel preparation method of bamboo charcoal board of the present invention utilizes activated calcium powder in combination with silane coupling agent to build a stable chemical bond at the interface between inorganic bamboo charcoal particles and organic resin matrix, thereby improving the interfacial bonding strength. At the same time, through the integrated molding process combining resin coating pretreatment, atomized coupling surface modification and foaming hot pressing, the overall density of the material is improved, thereby improving the nail holding capacity and assembly connection firmness of the bamboo charcoal board.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 This is a flowchart of a novel preparation method for bamboo charcoal boards according to an embodiment of the present invention. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] The following describes a novel method for preparing bamboo charcoal boards according to an embodiment of the present invention, with reference to the accompanying drawings.

[0023] like Figure 1 As shown in the figure, this embodiment provides a novel method for preparing bamboo charcoal boards, and the specific steps are as follows:

[0024] Example 1

[0025] S1: Add light calcium carbonate powder and heavy calcium carbonate powder to a mixer and mix at 450 r / min for 4 minutes. Then heat to 105℃, add stearic acid, and stir at 650 r / min for 8 minutes at a constant temperature. After fully activating and modifying, let it cool naturally to room temperature to obtain activated calcium carbonate powder for later use.

[0026] S2: Select KH-550 type aminosilane coupling agent, mix it with anhydrous ethanol at a mass ratio of 1:9, place it in a magnetic stirrer, stir for 6 minutes at room temperature of 25℃ and a speed of 200r / min to obtain a diluted coupling agent solution.

[0027] S3: Crush the bamboo charcoal raw material with a hammer mill and sieve it through a 600-mesh standard sieve. Then, place the sieved bamboo charcoal powder in an 80℃ oven and dry it at a constant temperature for 6 hours, controlling the moisture content to be 1.8%. Then, put the dried bamboo charcoal powder and activated calcium powder into a high-speed mixer and premix them at 300r / min for 4 minutes. Then, add natural rosin resin particles, antioxidant 1010, and 300-mesh high-density polyethylene micro powder wax. Heat the mixture to 108℃ and stir it at 9000r / min for 12 minutes to obtain resin-coated particles.

[0028] S4: Place the resin-coated granules in a high-speed mixer and preheat them for 4 minutes at 65°C and 3000 r / min. Then, spray the diluted coupling agent solution onto the surface of the granules under an atomization pressure of 0.3 MPa and continue stirring for 10 minutes. After cooling to room temperature, add the composite foaming agent and stir at 300 r / min for 5 minutes to obtain a loose granular composite mixture.

[0029] S5: Set the target density of the board to 0.65 g / cm³, weigh the composite mixture, and then evenly spread it in the hot press mold (the hot press mold is 1220×2440 mm in size). The thickness of the bamboo charcoal board is 6 mm. Set the hot pressing temperature to 140℃, the hot pressing pressure to 2.5 MPa, and the hot pressing time to 20 minutes. Finally, cool it to 50℃ and unload the board to obtain the bamboo charcoal board.

[0030] The composite foaming agent is prepared by uniformly mixing azodicarbonamide and sodium bicarbonate in a mass ratio of 2:1.

[0031] Example 2

[0032] S1: Add light calcium carbonate powder and heavy calcium carbonate powder to a mixer and mix at 500 r / min for 5 minutes. Then heat to 110℃, add stearic acid, and stir at 700 r / min for 9 minutes at a constant temperature. After fully activating and modifying, let it cool naturally to room temperature to obtain activated calcium carbonate powder for later use.

[0033] S2: Select KH-560 type epoxy silane coupling agent, mix it with anhydrous ethanol at a mass ratio of 1:9, place it in a magnetic stirrer, stir for 7 minutes at room temperature of 28℃ and a speed of 220r / min to obtain a diluted coupling agent solution.

[0034] S3: Crush the bamboo charcoal raw material with a hammer mill and sieve it through an 800-mesh standard sieve. Then, place the sieved bamboo charcoal powder in a 78℃ oven and dry it at a constant temperature for 7 hours, controlling the moisture content to be 1.5%. Then, put the dried bamboo charcoal powder and activated calcium powder into a high-speed mixer and premix them at 350r / min for 3 minutes. Then, add natural rosin resin particles, antioxidant 1076, and 400-mesh high-density polyethylene micro powder wax. Heat the mixture to 110℃ and stir it at 9500r / min for 10 minutes to obtain resin-coated particles.

[0035] S4: Place the resin-coated granules in a high-speed mixer and preheat them for 3 minutes at 70°C and 3200 r / min. Then, spray the diluted coupling agent solution onto the surface of the granules under an atomization pressure of 0.35 MPa and continue stirring for 12 minutes. After cooling to room temperature, add the composite foaming agent and stir at 300 r / min for 5 minutes to obtain a loose granular composite mixture.

[0036] S5: Set the target density of the board to 0.75 g / cm³, weigh the composite mixture, and then evenly spread it in the hot press mold (the hot press mold is 1220×2440 mm in size). The thickness of the bamboo charcoal board is 6 mm. Set the hot pressing temperature to 145℃, the hot pressing pressure to 2.6 MPa, and the hot pressing time to 18 minutes. Finally, cool it to 55℃ and unload the board to obtain the bamboo charcoal board.

[0037] The composite foaming agent is prepared by uniformly mixing azodicarbonamide and sodium bicarbonate in a mass ratio of 2:1.

[0038] Example 3

[0039] S1: Add light calcium carbonate powder and heavy calcium carbonate powder to a mixer and mix at 400 r / min for 6 minutes. Then heat to 100℃, add stearic acid, and stir at 600 r / min for 10 minutes at a constant temperature. After fully activating and modifying, let it cool naturally to room temperature to obtain activated calcium carbonate powder for later use.

[0040] S2: Select KH-570 type vinyl silane coupling agent, mix it with anhydrous ethanol at a mass ratio of 1:9, place it in a magnetic stirrer, stir for 8 minutes at room temperature of 22℃ and a speed of 180r / min to obtain a diluted coupling agent solution.

[0041] S3: Crush the bamboo charcoal raw material with a hammer mill and sieve it using a 1000-mesh standard sieve. Then, place the sieved bamboo charcoal powder in an 85℃ oven and dry it at a constant temperature for 5 hours, controlling the moisture content to be 2.2%. Then, put the dried bamboo charcoal powder and activated calcium powder into a high-speed mixer and premix them at 250r / min for 5 minutes. Then, add natural rosin resin particles, antioxidant 264, and 200-mesh PE wax, raise the temperature to 105℃, and stir at a high speed of 8500r / min for 15 minutes to obtain resin-coated particles.

[0042] S4: Place the resin-coated granules in a high-speed mixer and preheat for 5 minutes at 55°C and 2500 r / min. Then, spray the diluted coupling agent solution onto the surface of the granules under an atomization pressure of 0.25 MPa and continue stirring for 8 minutes. After cooling to room temperature, add the composite foaming agent and stir at 250 r / min for 5 minutes to obtain a loose granular composite mixture.

[0043] S5: Set the target density of the board to 0.58 g / cm³, weigh the composite mixture, and then evenly spread it in the hot press mold (the hot press mold is 1220×2440 mm in size). The thickness of the bamboo charcoal board is 6 mm. Set the hot pressing temperature to 130℃, the hot pressing pressure to 2.3 MPa, and the hot pressing time to 22 minutes. Finally, cool it to 45℃ and unload the board to obtain the bamboo charcoal board.

[0044] The composite foaming agent is prepared by uniformly mixing azodicarbonamide and sodium bicarbonate in a mass ratio of 2:1.

[0045] In summary, the novel preparation method of bamboo charcoal board of the present invention utilizes activated calcium powder in combination with silane coupling agent to construct a stable chemical bond at the interface between inorganic bamboo charcoal particles and organic resin matrix, thereby improving the interfacial bonding strength. At the same time, the integrated molding process combining resin coating pretreatment, atomized coupling surface modification and foaming hot pressing improves the overall density of the material, thereby improving the nail holding capacity and assembly connection firmness of the bamboo charcoal board.

[0046] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A novel method for preparing bamboo charcoal boards, characterized in that, Includes the following steps: S1: Combine light calcium carbonate powder and heavy calcium carbonate powder, mix them thoroughly, and then use stearic acid to activate the mixed calcium carbonate powder to obtain activated calcium carbonate powder. S2: The silane coupling agent is diluted with anhydrous ethanol to obtain a diluted coupling agent solution; S3: Grind the bamboo charcoal raw material into powder, then sieve and dry it. Combine it with the activated calcium powder obtained in step S1, mix it thoroughly, and then add natural resin particles, antioxidants and PE wax to make resin-coated particles. S4: Spray the diluted coupling agent solution obtained in step S2 into the resin-coated particles obtained in step S3, stir and mix thoroughly, add the composite foaming agent and stir and mix again to obtain a loose granular composite mixture. S5: According to the weight of the target board, the loose granular composite mixture obtained in step S4 is laid in a hot press mold and pressed into bamboo charcoal board under high temperature and high pressure.

2. The novel preparation method of bamboo charcoal board according to claim 1, characterized in that, The S1 step specifically includes the following operations: Place the light calcium carbonate powder and heavy calcium carbonate powder in a mixer and mix them at a speed of 400-550 r / min for 2-6 minutes. Then raise the temperature of the mixer to 100-110℃, add stearic acid, and stir at a speed of 600-750 r / min for 7-10 minutes. After thorough mixing, cool the mixture to obtain activated calcium carbonate powder.

3. The novel preparation method of bamboo charcoal board according to claim 1, characterized in that, The S2 step specifically includes the following operations: The silane coupling agent and anhydrous ethanol are combined at a mass ratio of 1:9 and added to a magnetically stirred reaction apparatus. The mixture is then magnetically stirred at 180-220 r / min for 4-8 minutes at a temperature of 20-30℃ to obtain a diluted coupling agent solution.

4. The novel preparation method of bamboo charcoal board according to claim 1, characterized in that, The S3 step specifically includes the following operations: The bamboo charcoal raw material is crushed in a hammer mill and sieved through a 300-1200 mesh standard sieve. The sieved bamboo charcoal powder is then placed in an oven and dried at a constant temperature of 75-85℃ for 5-7 hours. The bamboo charcoal powder with a moisture content of 1.0%-2.5% is then placed in a high-speed mixer, activated calcium powder is added, and it is premixed at a speed of 250-350r / min. Natural rosin resin particles, antioxidants, and PE wax are added to the premixed raw materials, and the mixture is stirred at a temperature of 105-112℃ and a speed of 8000-10000r / min to obtain resin-coated particles.

5. A novel method for preparing bamboo charcoal boards according to claim 1, characterized in that, The S4 step specifically includes the following operations: The resin-coated granules are placed in a high-speed mixer and preheated at 55-75℃ and 2500-3500 r / min. Then, the coupling agent dilution solution is sprayed onto the surface of the resin-coated granules under an atomization spraying pressure of 0.2-0.4MPa. After thorough mixing, the mixture is cooled to room temperature, and a composite foaming agent is added. The mixture is stirred at 250-350 r / min to obtain a loose granular composite mixture.

6. A novel method for preparing bamboo charcoal boards according to claim 1, characterized in that, The S5 step specifically includes the following operations: The predetermined density of the bamboo charcoal board is 0.42-0.85 g / cm3. The loose granular composite mixture is weighed, then spread evenly in a hot press mold, and hot-pressed at 2.2-2.8 MPa within a temperature range of 125-160℃. The board is then cooled to 40-65℃ and unloaded to obtain the desired bamboo charcoal board.

7. A novel method for preparing bamboo charcoal boards according to claim 1, characterized in that, The silane coupling agent is any one or a combination of KH-550 type aminosilane coupling agent, KH-560 type epoxysilane coupling agent, and KH-570 type vinylsilane coupling agent.

8. A novel method for preparing bamboo charcoal boards according to claim 1, characterized in that, The antioxidant is one or more of antioxidant 1010, antioxidant 1076, and antioxidant 264.

9. A novel method for preparing bamboo charcoal boards according to claim 1, characterized in that, The PE wax is high-density polyethylene micro powder wax with a powder mesh size of 200-450 mesh.

10. A novel method for preparing bamboo charcoal boards according to claim 1, characterized in that, The composite foaming agent is a low-temperature organic composite foaming agent, which is composed of azodicarbonamide and sodium bicarbonate in a mass ratio of 2:1.

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