A bamboo 3D printing slurry and its preparation method and application

Abstract

The present invention belongs to the technical field of bamboo processing waste utilization, and specifically relates to a bamboo 3D printing slurry and its preparation method and application. The present invention compounds bamboo pulp with MgAl2(SiO3)4 and CaSO4. Magnesium aluminum silicate and calcium sulfate are the main components of gypsum. The prepared bamboo 3D printing slurry does not need high-temperature sintering for molding after 3D printing. It only needs to remove the moisture in the material to achieve solidification molding, which simplifies the solidification molding process and solves the difficulty that the existing non-hot-melt materials need to be calcined at high temperature for a long time to solidify and mold.

Description

Technical Field

[0001] The invention belongs to the technical field of bamboo processing waste utilization, and specifically relates to a bamboo 3D printing slurry and a preparation method and application thereof. Background Art

[0002] Bamboo is a fast-growing, widely distributed, and high-yield renewable resource. During the bamboo processing process, a large amount of residue - bamboo chips - is produced, and the utilization rate of this part of the material is not high. 3D printing is a new type of rapid additive manufacturing technology. Deep processing of bamboo processing residues - bamboo chips into 3D printing materials is an effective way to improve the utilization rate of bamboo processing residues.

[0003] 3D printing materials include hot-melt materials and non-hot-melt materials. Regarding hot-melt materials, the technical routes for using bamboo in 3D printing materials in existing reports can be summarized into two categories: ① Composite bamboo with thermoplastic materials to partially replace non-renewable petrochemical materials. ② Convert bamboo into furan furfural polymer thermoplastic materials through catalysis. Among them, bamboo-plastic composite materials use bamboo powder to partially replace non-renewable petrochemical materials, and only partially achieve the degradability of 3D printing materials. Bamboo-based furan furfural polymer materials require various catalysts and catalytic conditions such as temperature and pressure, and after the catalysis is completed, they need to be further separated and purified. The production and purification are difficult, resulting in high costs. At the same time, hot-melt materials also have the problem that the stability of the material after production needs to be improved, which limits the use of hot-melt 3D printing materials.

[0004] Therefore, it is urgent to develop a non-hot-melt 3D printing material based on bamboo. The existing non-hot-melt 3D printing materials are ceramic materials. This type of material has no hot-melt parts in the 3D growth process, and after printing and molding, it still requires a long time of high-temperature calcination (800-1200℃) process to solidify and shape. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a bamboo 3D printing slurry and its preparation method and application. The present invention compounds bamboo pulp with MgAl2(SiO3)4 and CaSO4, and the obtained bamboo 3D printing slurry does not need high-temperature sintering and molding after 3D printing. It only needs to remove the moisture in the material to achieve solidification molding.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a method for preparing a bamboo 3D printing slurry, comprising the following steps:

[0008] pulping bamboo chips to obtain bamboo pulp;

[0009] The bamboo pulp, MgAl2(SiO3)4 and CaSO4 are mixed and concentrated to obtain the bamboo 3D printing slurry, and the water content of the bamboo 3D printing slurry is 40-60%.

[0010] Preferably, on a dry basis, the weight ratio of the bamboo chips, MgAl2(SiO3)4 and CaSO4 is 10:1-2:2-4.

[0011] Preferably, the fineness of the MgAl2(SiO3)4 and CaSO4 is independently 1200-2000 mesh.

[0012] Preferably, the pulping comprises the following steps: soaking bamboo chips in water and then crushing them to obtain bamboo pulp; the moisture content of the bamboo chips is 12-15%, and the weight ratio of the bamboo chips to water is 1:4-8.

[0013] Preferably, the soaking temperature is 20-35° C. and the soaking time is 2-6 hours.

[0014] Preferably, the crushing equipment is a colloid mill, the tooth spacing of the colloid mill is 5 to 20 μm, the rotation speed is 4000 to 5000 rpm, and the crushing time is 60 to 180 min.

[0015] Preferably, the concentration method is drying, the drying temperature is 60 to 80° C., the vacuum degree is -0.09 to 0.11 MPa, and the drying time is 40 to 120 min.

[0016] The present invention also provides a bamboo 3D printing slurry obtained by the preparation method described in the above technical solution, wherein the bamboo 3D printing slurry comprises bamboo pulp, MgAl2(SiO3)4 and CaSO4.

[0017] The present invention also provides the application of the bamboo 3D printing slurry described in the above technical solution in 3D printing.

[0018] Preferably, the 3D printing comprises the following steps:

[0019] The bamboo 3D printing slurry is 3D printed and then cured to obtain a 3D printing material;

[0020] The curing method is room temperature curing or microwave curing. The room temperature curing temperature is 25-35°C and the time is 24 hours. The parameters of the microwave curing include: microwave power is 300-600W, duration is 30-150s, cooling time is 3-5min, and the number of cycles is 1-3 times.

[0021] The present invention provides a method for preparing a bamboo 3D printing slurry, comprising the following steps:

[0022] pulping bamboo chips to obtain bamboo pulp;

[0023] The bamboo pulp, MgAl2(SiO3)4 and CaSO4 are mixed and concentrated to obtain the bamboo 3D printing slurry, and the water content of the bamboo 3D printing slurry is 40-60%.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention compounds bamboo pulp with MgAl2(SiO3)4 and CaSO4. Magnesium aluminum silicate and calcium sulfate are the main components of gypsum. The obtained bamboo 3D printing slurry does not require high-temperature sintering for molding after 3D printing. It only needs to remove moisture from the material to achieve solidification and molding, which simplifies the solidification and molding process and solves the difficulty that existing non-hot-melt materials require long-term high-temperature calcination for solidification and molding.

[0026] Furthermore, because bamboo cells contain organic glue, polysaccharides, and fatty acid components, combined with fine bamboo particles, they will unite and form after dehydration. If only bamboo chips are used, the printed material is prone to shrinkage and cracking after dehydration. The present invention adds magnesium-based and calcium-based inorganic materials (magnesium aluminum silicate and calcium sulfate) to bamboo pulp to increase the solid content of the pulp. At the same time, the magnesium-based and calcium-based inorganic materials also have a curing and forming effect, which can prevent deformation during the later dehydration and curing process of the material, and is conducive to maintaining the shape of the printed material during the drying process.

[0027] Furthermore, the bamboo 3D printing slurry of the present invention uses bamboo processing waste - bamboo chips as raw materials, and has the advantages of low cost and good degradation performance of printing materials.

[0028] The present invention also provides a bamboo 3D printing slurry prepared by the preparation method described in the above technical solution, which is stable within 6 months in a sealed state, and after the material bag is opened and used, it only needs to seal the opening to prevent dehydration to achieve long-term storage. Compared with clay-based 3D printing materials, the stability of the bamboo 3D printing slurry of the present invention is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a picture of the finished product after the bamboo 3D printing slurry is printed and formed in Example 1;

[0031] Figure 2This is a picture of the finished product after printing with the bamboo 3D printing slurry in Comparative Example 1;

[0032] Figure 3 This is an exploded view of Cerambot's sintering furnace;

[0033] Figure 4 This is an overall diagram of Cerambot's sintering furnace. DETAILED DESCRIPTION

[0034] The present invention provides a method for preparing a bamboo 3D printing slurry, comprising the following steps:

[0035] pulping bamboo chips to obtain bamboo pulp;

[0036] The bamboo pulp, MgAl2(SiO3)4 and CaSO4 are mixed and concentrated to obtain the bamboo 3D printing slurry, and the water content of the bamboo 3D printing slurry is 40-60%.

[0037] In the present invention, unless otherwise specified, the materials and equipment used are commercially available products in the art.

[0038] The invention pulps bamboo chips to obtain bamboo pulp.

[0039] In the present invention, the pulping preferably includes the following steps: soaking bamboo chips in water and then crushing them to obtain bamboo pulp; the moisture content of the bamboo chips is preferably 12-15%, more preferably 12.5%; the weight ratio of the bamboo chips to water is preferably 1:4-8, more preferably 1:5-6.

[0040] In the present invention, the bamboo chips are preferably obtained by drying commercially available bamboo chips, the drying temperature is preferably 105°C, and the time is preferably 1 hour. The drying can control the moisture content of the bamboo chips, and is beneficial to the softening of lignin in the bamboo chips and the destruction of cell membranes. After soaking in water, lignin is easier to crush, and polysaccharides in the cytoplasm are easier to release during the grinding process of the colloid mill.

[0041] In the present invention, the soaking temperature is preferably 20-35°C, more preferably 25°C; the soaking time is preferably 2-6h, more preferably 3h; the soaking temperature and time of the present invention can fully wet the bamboo chips and soften the lignin and cellulose.

[0042] In the present invention, the crushing equipment is preferably a colloid mill, a ball mill, a sand mill or a homogenizer, and the tooth spacing of the colloid mill is preferably 5-20 μm, more preferably 10 μm; the rotation speed is preferably 4000-5000 rpm, more preferably 4200-4500 rpm; the crushing time is preferably 60-180 min, more preferably 80-100 min; the material handling capacity of the ball mill is low, and the sand mill and homogenizer both require the raw material particles to be crushed to a certain fineness, otherwise the machine will be greatly damaged. The colloid mill has relatively rough requirements for raw materials, and the material coarseness can be 4 mesh (4.75 mm), so the crushing equipment of the present invention is preferably a colloid mill. The use of the colloid mill can fully crush and refine the bamboo chips, preparing for the subsequent bamboo reconstruction, which refers to the process of bamboo being reshaped by micron-sized bamboo particles due to intermolecular forces and viscous substances.

[0043] In the present invention, the inner kettle of the colloid mill preferably adopts an external circulation oil bath system and is preferably preheated before starting; the temperature of the external circulation oil bath system is preferably 70-90°C, more preferably 80°C; the preheating time is preferably 30 minutes, and the purpose of the preheating is to adapt the machine to the temperature environment.

[0044] In the present invention, the particle size of the bamboo chips in the bamboo pulp is preferably 20 to 40 μm.

[0045] After obtaining the bamboo pulp, the present invention mixes the bamboo pulp, MgAl2(SiO3)4 and CaSO4 and concentrates them to obtain the bamboo 3D printing slurry, and the water content of the bamboo 3D printing slurry is 40-60%.

[0046] In the present invention, the weight ratio of the bamboo chips, MgAl2(SiO3)4 and CaSO4 is preferably 10:1-2:2-4, more preferably 10:2:2, calculated on a dry basis.

[0047] If bamboo pulp is used directly for 3D printing, due to the high water content of bamboo pulp, the printed material will be severely deformed after dehydration and curing. Adding magnesium-based and calcium-based inorganic materials (magnesium aluminum silicate and calcium sulfate) can increase the solid content of the slurry. At the same time, magnesium-based and calcium-based inorganic materials also have a curing and forming effect, which can prevent deformation of the material during the dehydration and curing process.

[0048] In the present invention, the fineness of the MgAl2(SiO3)4 and CaSO4 is independently preferably 1200-2000 mesh. The fineness of the MgAl2(SiO3)4 and CaSO4 in the present invention can make the mixed material more uniform.

[0049] The present invention preferably homogenizes the mixed slurry obtained by mixing bamboo pulp, MgAl2(SiO3)4 and CaSO4, and then concentrates it; the homogenization pressure is preferably 5000-8000psi, more preferably 6000psi; the flow rate is preferably 60-100mL / min, more preferably 80-90mL / min; the number of cycles is preferably 3-8 times, more preferably 4-5 times; the homogenization can fully mix the components in the mixed slurry.

[0050] In the present invention, the concentration method is preferably drying, the drying temperature is preferably 60-80°C, more preferably 50°C; the vacuum degree is preferably -0.09-0.11MPa, more preferably -0.1MPa; the time is preferably 40-120min, more preferably 50min, and the purpose of the concentration is to control the moisture content in the bamboo 3D printing slurry.

[0051] In the present invention, the water content of the bamboo 3D printing slurry is preferably 50%; the water content of the bamboo 3D printing slurry of the present invention can facilitate 3D printing, and the bamboo 3D printing slurry will not be directly cured, and the obtained printing material does not need high temperature curing.

[0052] The present invention also provides a bamboo 3D printing slurry obtained by the preparation method described in the above technical solution, wherein the bamboo 3D printing slurry comprises bamboo pulp, MgAl2(SiO3)4 and CaSO4.

[0053] The bamboo 3D printing slurry of the present invention is stable within 6 months in a sealed state, and after the material bag is opened and used, it only needs to seal the opening to prevent dehydration to achieve long-term storage. Compared with clay-based 3D printing materials, the stability of the bamboo 3D printing slurry of the present invention is significantly improved.

[0054] The present invention also provides the application of the bamboo 3D printing slurry described in the above technical solution in 3D printing.

[0055] In the present invention, the 3D printing preferably includes the following steps:

[0056] The bamboo 3D printing slurry is 3D printed and then solidified to obtain a 3D printing material.

[0057] The present invention preferably places the bamboo 3D printing slurry into a feed tank equipped with an electric push rod for 3D printing, and a polytetrafluoroethylene tube with a temperature resistance of 220°C is placed between the feed tank and the 3D extruder head; during the 3D printing, the polytetrafluoroethylene tube is equipped with three independently controlled heating sleeves, and the temperature of the first heating sleeve is preferably 60-80°C, more preferably 70°C; the temperature of the second heating sleeve is preferably 85-95°C, more preferably 90°C; the third heating sleeve is close to the extruder and the temperature is preferably 105-115°C, more preferably 105°C; the feeding speed of the bamboo 3D printing slurry is preferably 4-8mL / min, more preferably 5mL / min.

[0058] In the present invention, the curing method is preferably room temperature curing or microwave curing, the room temperature curing temperature is preferably 25-35°C, and the time is preferably 24h; the parameters of the microwave curing include: the microwave power is preferably 300-600W, more preferably 350W; the duration is preferably 30-150s, more preferably 60s; the cooling time is preferably 3-5min, more preferably 4min; the number of cycles is preferably 1-3 times, more preferably 3 times.

[0059] In the present invention, the density of the 3D printing material is preferably 0.7 to 0.9 g / cm 3 , more preferably 0.83 to 0.88 g / cm 3 ; The impact strength is preferably 3.8 to 9.5 KJ / m 2 , more preferably 4.1 to 4.5 kJ / m 2 .

[0060] In order to further illustrate the present invention, the bamboo 3D printing slurry and its preparation method and application of the present invention are described in detail below in combination with the accompanying drawings and embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0061] Example 1

[0062] 1. Dry the bamboo chips in an oven at 105℃ for 1 hour to make the moisture content of the dried bamboo chips 12.5%. Mix the dried bamboo chips with water at a weight ratio of 1:5, soak at room temperature of 25℃ for 3 hours and put into the colloid mill;

[0063] 2. The temperature of the colloid mill inner kettle adopts an external circulation oil bath system of 80°C, and the machine is preheated for 30 minutes before starting up to adapt the machine to the temperature environment. Then the colloid mill tooth spacing is adjusted to 10μm, the speed is 4200rpm, and the equipment is operated for 100 minutes to obtain bamboo pulp;

[0064] 3. Add MgAl2(SiO3)4 and CaSO4 to the prepared bamboo pulp in a weight ratio of 10:2:2 on a dry basis of bamboo scraps, MgAl2(SiO3)4 and CaSO4, and mix thoroughly in a cement mixer, wherein the fineness of MgAl2(SiO3)4 and CaSO4 is 1200 mesh;

[0065] 4. The slurry was fed into a high-pressure homogenizer. The homogenization parameters included a pressure of 6000 psi, a flow rate of 80 mL / min, and 5 homogenization cycles.

[0066] 5. Place the slurry in a vacuum drying oven, set the temperature to 60°C, vacuum degree to -0.1MPa, and time to 40 minutes to obtain bamboo 3D printing slurry with a moisture content of 50%.

[0067] 6. Put the prepared bamboo 3D printing slurry into a feed tank equipped with an electric push rod. There is a 220°C temperature-resistant polytetrafluoroethylene tube between the feed tank and the 3D extruder. During 3D printing, the polytetrafluoroethylene tube is equipped with three independently controlled heating sleeves. The first heating sleeve has a temperature of 70°C, the second heating sleeve has a temperature of 90°C, and the third heating sleeve is close to the extruder and has a temperature of 105°C. The feed speed is 5mL / min.

[0068] 7. After the bamboo 3D printing slurry is printed, place it in a household microwave oven with a power of 350W for 60 seconds, cool it for 4 minutes, and cycle it 3 times to complete the curing of the printed pattern.

[0069] Figure 1 This is the finished product after the bamboo 3D printing slurry is printed and formed in Example 1. After molding and dehydration, the material remains in its original state without shrinkage or cracking. The density of the finished product is 0.88g / cm 3 , tested by pendulum impact tester, the impact strength is 4.5KJ / m 2 .

[0070] Example 2

[0071] 1. Dry the bamboo chips in an oven at 105℃ for 1 hour to make the moisture content of the dried bamboo chips 12.5%. Mix the dried bamboo chips with water at a weight ratio of 1:8, soak them at room temperature of 25℃ for 2 hours, and then put them into the colloid mill.

[0072] 2. The temperature of the colloid mill inner kettle adopts an external circulation oil bath system of 90°C, and the machine is preheated for 30 minutes before starting to adapt the machine to the temperature environment. Then the colloid mill tooth spacing is adjusted to 5μm, the speed is 4500rpm, and the equipment is operated for 80 minutes to obtain bamboo pulp;

[0073] 3. Add MgAl2(SiO3)4 and CaSO4 to the prepared bamboo pulp in a weight ratio of 10:1:2 based on the dry basis of bamboo scraps, MgAl2(SiO3)4 and CaSO4, and mix them thoroughly in a cement mixer, wherein the fineness of MgAl2(SiO3)4 and CaSO4 is 1200 mesh;

[0074] 4. The slurry was fed into a high-pressure homogenizer. The homogenization parameters included a pressure of 6000 psi, a flow rate of 90 mL / min, and 4 homogenization cycles.

[0075] 5. Put the slurry into a vacuum drying oven, set the temperature to 50°C, the vacuum degree to -0.1MPa, and the time to 50 minutes to obtain bamboo 3D printing slurry with a moisture content of 50%.

[0076] 6. Put the prepared bamboo 3D printing slurry into a feed tank equipped with an electric push rod. There is a 220°C temperature-resistant polytetrafluoroethylene tube between the feed tank and the 3D extruder. During 3D printing, the polytetrafluoroethylene tube is equipped with three independently controlled heating sleeves. The first heating sleeve has a temperature of 70°C, the second heating sleeve has a temperature of 90°C, and the third heating sleeve is close to the extruder and has a temperature of 105°C. The feed speed is 5mL / min.

[0077] 7. After the bamboo 3D printing slurry is printed, place it in a household microwave oven with a power of 350W for 60 seconds, cool it for 4 minutes, and cycle it 3 times to complete the curing of the printed pattern.

[0078] After molding and dehydration, the 3D printing material remains in its original shape without shrinkage or cracking. The density of the finished product is 0.83g / cm 3 , tested by pendulum impact tester, the impact strength is 4.1KJ / m 2 .

[0079] Comparative Example 1

[0080] 1. Dry the bamboo chips in an oven at 105℃ for 1 hour to make the moisture content of the dried bamboo chips 12.5%. Mix the dried bamboo chips with water at a weight ratio of 1:8, soak them at room temperature of 25℃ for 2 hours, and then put them into the colloid mill.

[0081] 2. The temperature of the colloid mill inner kettle adopts an external circulation oil bath system of 90°C, and the machine is preheated for 30 minutes before starting to adapt the machine to the temperature environment. Then the colloid mill tooth spacing is adjusted to 5μm, the speed is 4500rpm, and the equipment is operated for 80 minutes to obtain bamboo pulp;

[0082] 3. Add MgAl2(SiO3)4 and CaSO4 to the prepared bamboo pulp in a weight ratio of 10:3:5 based on the dry basis of bamboo scraps, MgAl2(SiO3)4 and CaSO4, and mix them thoroughly in a cement mixer, wherein the fineness of MgAl2(SiO3)4 and CaSO4 is 1200 mesh;

[0083] 4. The slurry was fed into a high-pressure homogenizer. The homogenization parameters included a pressure of 6000 psi, a flow rate of 90 mL / min, and 4 homogenization cycles.

[0084] 5. Put the slurry into a vacuum drying oven, set the temperature to 50°C, the vacuum degree to -0.1MPa, and the time to 50 minutes to obtain bamboo 3D printing slurry with a moisture content of 50%.

[0085] 6. Put the prepared bamboo 3D printing slurry into a feed tank equipped with an electric push rod. There is a 220°C temperature-resistant polytetrafluoroethylene tube between the feed tank and the 3D extruder. During 3D printing, the polytetrafluoroethylene tube is equipped with three independently controlled heating sleeves. The first heating sleeve has a temperature of 70°C, the second heating sleeve has a temperature of 90°C, and the third heating sleeve is close to the extruder and has a temperature of 105°C. The feed speed is 5mL / min.

[0086] Figure 2 This is the finished product image after printing with the bamboo 3D printing slurry in Comparative Example 1. The adhesion between the materials is poor and the material density is high. During the layered 3D printing process, it is easy to collapse during its own gravity sedimentation as the height increases, and it is difficult to form the required printing configuration.

[0087] Comparison Cerambot clay material: mainly composed of Al2O3, SiO2 and Fe2O3. After printing, solidification requires high temperature (1200℃) sintering and is placed in a special ceramic sintering equipment. The microwave kiln is a ceramic sintering equipment developed by Eazao specifically for ceramic 3D printing. Figure 3 and 4 This is a physical picture of Cerambot's sintering furnace. Figure 3 For the decomposition diagram, Figure 4 It is an overall diagram, used to place the molding materials after printing. Electric kilns and gas kilns must also meet the requirement of sintering temperature above 800℃.

[0088] It can be seen from the above embodiments and comparative examples that after 3D printing using the bamboo 3D printing slurry of the present invention, the drying and molding process is simple, and the 3D printing material can be solidified and molded by removing the water from the material, and there is no redissolution and collapse phenomenon when it encounters water after solidification and molding. However, the subsequent solidification and molding of non-hot-melt 3D printing materials such as clay requires high-temperature sintering.

[0089] The bamboo 3D printing slurry of the present invention is stable within 6 months in a sealed state, and after the material bag is opened and used, it only needs to seal the opening to prevent dehydration to achieve long-term storage. Compared with clay 3D printing materials (according to the Eazao website, it is best to use it within 15 days in a sealed state, and once opened, it must be used up within 3 days, otherwise it will become hardened), the stability of the bamboo 3D printing slurry of the present invention is significantly improved.

[0090] Although the above-mentioned embodiments have made a detailed description of the present invention, they are only some embodiments of the present invention, rather than all embodiments. People can also obtain other embodiments based on the embodiments of the present invention without creative work, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A method for preparing bamboo 3D printing slurry, characterized in that: The following steps are involved: Soaking bamboo scraps in water and then crushing them to obtain bamboo pulp; The bamboo pulp, MgAl2(SiO3)4 and CaSO4 are mixed and concentrated to obtain the bamboo 3D printing slurry, wherein the water content of the bamboo 3D printing slurry is 40-60%; On a dry basis, the weight ratio of the bamboo scraps, MgAl2(SiO3)4 and CaSO4 is 10:1-2:2-4; The fineness of the MgAl2(SiO3)4 and CaSO4 is independently 1200-2000 mesh; The crushing equipment is a colloid mill, the tooth spacing of the colloid mill is 5-20 μm, the rotation speed is 4000-5000 rpm, and the crushing time is 60-180 min.

2. The preparation method according to claim 1, characterized in that: The moisture content of the bamboo chips is 12-15%, and the weight ratio of the bamboo chips to water is 1:4-8.

3. The preparation method according to claim 1, characterized in that: The soaking temperature is 20-35° C. and the soaking time is 2-6 hours.

4. The preparation method according to claim 1, characterized in that: The concentration method is drying, the drying temperature is 60-80° C., the vacuum degree is -0.09-0.11 MPa, and the drying time is 40-120 min.

5. The bamboo 3D printing slurry obtained by the preparation method according to any one of claims 1 to 4, characterized in that: The bamboo 3D printing slurry includes bamboo pulp, MgAl2(SiO3)4 and CaSO4.

6. Application of the bamboo 3D printing slurry according to claim 5 in 3D printing.

7. The use according to claim 6, characterized in that: The 3D printing comprises the following steps: The bamboo 3D printing slurry is 3D printed and then cured to obtain a 3D printing material; The curing method is room temperature curing or microwave curing. The room temperature curing temperature is 25-35°C and the time is 24 hours. The parameters of the microwave curing include: microwave power is 300-600W, duration is 30-150s, cooling time is 3-5min, and the number of cycles is 1-3 times.

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