A plant fiber composite material and its preparation method and preparation device

Abstract

The present invention discloses a plant fiber composite material and a preparation method and a preparation device thereof, which relate to the technical field of composite materials, and comprises a mounting frame, wherein the mounting frame is provided with a tank body and a motor, wherein a rotating shaft is rotatably provided in the tank body, wherein the motor is in transmission connection with the rotating shaft, wherein a hollow mounting plate is fixedly provided on the rotating shaft, wherein a plurality of sleeves are evenly distributed on the outer wall of the mounting plate, wherein a telescopic rod is slidably provided in the sleeve, wherein a plurality of mounting boxes connected to the inside of the tank body are provided on the outer wall of the tank body, wherein a baffle is slidably provided in the mounting box, and wherein a control mechanism for controlling the synchronous extension and retraction of the telescopic rod and the baffle is provided on the mounting plate. The present invention controls the baffle to extend into the tank body, so that the high-speed rotating liquid material hits the baffle when rotating along the inner wall of the tank body, thereby increasing the turbulence degree of the liquid material and reducing the generation of vortex phenomenon.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials, and in particular to a plant fiber composite material and a preparation method and a preparation device thereof. Background Art

[0002] Plant fiber composite materials are made by pressing and gluing powdered plant fibers with organic glue to make fiberboard, or by mixing sticky substances (such as cement) with plant fibers, making them dense through vibration or pressure, and then curing them naturally. Faced with increasingly serious environmental pollution problems and the gradual improvement of social environmental awareness, the trend of utilizing natural materials is also becoming more mature. The environmentally friendly, lightweight, low-energy consumption and renewable characteristics of plant fibers have attracted much attention and will surely develop rapidly in the foreseeable future.

[0003] In the production process of plant fiber composite materials, a high-speed mixer is used to add water to the plant materials for mixing. The existing high-speed mixer generally drives the stirring shaft set at the center of the mixer to rotate by a motor, and the stirring rod set on the stirring shaft rotates to mix the raw materials. When water is added to the raw materials of the plant fiber composite material for mixing, before the thickener takes effect, the viscosity of the liquid material in the container is low. At this time, the mixing device runs at a high speed, and the agitator speed is high enough, such as Figure 1 As shown, there is a pressure difference due to fluid flow in the liquid material along the cross section perpendicular to the velocity. Under the action of centrifugal force, the liquid material level at the container wall rises, while the liquid material level at the center drops, which will eventually lead to the formation of vortex. Since some raw materials have large particle size and high mass, they are easily thrown to the edge of the container during mixing, making the vortex phenomenon more obvious, which will cause the axial flow to be destroyed. All materials will flow in the form of radial flow fluid. The center of the vortex will be exposed to the air, making it difficult for the stirred liquid material to be fully mixed to form a uniform phase, resulting in difficulty in ensuring product quality. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that a vortex is generated at the center when a high-speed mixer mixes liquid materials, resulting in reduced stirring efficiency, and to propose a plant fiber composite material and a preparation method and a preparation device thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A preparation device of a plant fiber composite material comprises a mounting frame, wherein the mounting frame is provided with a tank body and a motor, a rotating shaft is rotatably arranged in the tank body, the motor is drivingly connected to the rotating shaft, a hollow mounting plate is fixedly arranged on the rotating shaft, a plurality of sleeves are equidistantly distributed on the outer wall of the mounting plate, a telescopic rod is slidably arranged in the sleeve, a plurality of mounting boxes connected to the interior of the tank body are arranged on the outer wall of the tank body, a baffle is slidably arranged in the mounting box, and a control mechanism for controlling the synchronous extension and retraction of the telescopic rod and the baffle is arranged on the mounting plate.

[0007] Preferably, the control mechanism includes a plurality of sliding rods fixedly arranged on the mounting plate, a counterweight block is slidably arranged on the sliding rods, a control plate is slidably arranged inside the mounting plate, a mounting plate is slidably arranged on the top of the mounting plate, a spring 2 is arranged between the mounting plate and the mounting plate, a control structure 2 for driving the baffle is provided on the mounting plate, a spring 1 is arranged between the control plate and the mounting plate, and a control structure 1 for driving the telescopic rod is provided on the control plate.

[0008] Preferably, the control structure 1 comprises a guide column fixedly arranged on one end of the telescopic rod close to the control board, the control board is provided with an inclined guide groove, the guide column extends into the guide groove and abuts against the inner wall of the guide groove.

[0009] Preferably, the second control structure includes a mounting ring rotatably mounted on the mounting plate, a plurality of connecting rods are fixedly mounted on the outer circumferential surface of the mounting ring, a pressure column is fixedly mounted on one end of the connecting rod close to the baffle plate, a cavity is defined in the baffle plate, an inclined pressure groove is defined in the cavity, and the pressure column extends into the pressure groove and abuts against the inner wall of the pressure groove.

[0010] Preferably, a plurality of limiting rods are vertically arranged on the top of the mounting plate, and the mounting plate is slidably connected to the limiting rods.

[0011] Preferably, the counterweight block is connected to the mounting plate and the control panel respectively through connecting ropes, and the two connecting ropes on the same counterweight block are both in a taut state.

[0012] Preferably, the baffle is provided with an installation opening, a spoiler is rotatably arranged in the installation opening, two limiting columns are fixedly arranged on the inner wall of the installation opening, and the two limiting columns are symmetrically distributed on both sides of the spoiler.

[0013] Preferably, a plurality of stirring blades are fixedly provided on the outer peripheral surface of the rotating shaft, and the stirring blades are located at the bottom of the tank body.

[0014] Preferably, the stirring blade is arranged in a spiral shape, and the torsion angle of the stirring blade is 90 degrees.

[0015] Accordingly, the present invention also provides a method for preparing a plant fiber composite material, comprising the following steps:

[0016] S1: First, wash the Salix psammophila branches, and then put them into a cutting machine to cut them into small pieces with a length of 1-2 cm;

[0017] S2: putting the cut straw and shrub short strips into a 100°C cooking pot for pretreatment for 3 minutes;

[0018] S3: washing and drying the corn stalks, and separating the husk and pith from the stalks using a husk and pith separation device;

[0019] S4: crushing corn stalk husk into 60-70 mesh powder by crusher, crushing small segments of Salix psammophila branches into 100 mesh powder, grinding stalk pith, bone glue and xanthan gum into powder to obtain 10-30 mm crushed material, and then grinding the crushed material with a grinder to make the particle size reach 100-120 mesh;

[0020] S5: Add water to the above raw materials in proportion and put them into a high-speed mixer, mix and react for 1-2 hours at a speed of 1000-1500r / min, cool to 50-70℃ and discharge;

[0021] S6: putting the slurry into a square mold of a hot press, selecting 140° C., 170° C., and 200° C. as the three-level hot pressing temperatures of the hot press, selecting 3.5, 5.0, and 6.5 MPa as the three-level hot pressing pressures of the hot press, and hot pressing and shaping the slurry;

[0022] S7: Use a universal testing machine to perform a tensile test and a three-point bending test on the bio-board to measure the tensile strength and bending strength of the bio-board;

[0023] S8: Measure the water resistance and water absorption of the bio-board using an angular contact meter and a water immersion test.

[0024] Correspondingly, the present invention also provides a plant fiber composite material, comprising the following components in mass fractions: 56-72 parts of corn straw fiber, 23-37 parts of Salix psammophila, 5-10 parts of corn straw pith, 10-18 parts of glue, 6-15 parts of xanthan gum, 2-7 parts of heat stabilizer and 15-22 parts of colorant, the corn straw fiber is selected to have a powder particle size of 60-70 mesh, the Salix psammophila branches are ground into powdered wood fiber with a particle size of 100 mesh, the heat stabilizer is stearic acid, and the colorant is white pigment.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. The present invention increases the turbulence of liquid materials and reduces the generation of vortex phenomena by arranging a retractable baffle. The turbulence generated by the baffle can make some heavier large-particle materials (such as 60-70 mesh corn stalks and 100 mesh Salix psammophila branches) flow with the fluid and spread in the tank, so that before the thickener takes effect and increases the viscosity of the liquid raw material, different materials are fully mixed to form a uniform phase, thereby achieving high-quality production of composite materials.

[0027] 2. The present invention realizes automatic control of the states of the baffle and the telescopic rod according to the operating speed of the equipment by arranging a telescopic rod and a slidable baffle in cooperation with a counterweight. When the equipment is running at a high speed, the telescopic rod is controlled to retract inwardly while the baffle is extended outwardly, which is beneficial to reducing the generation of vortices. When the equipment is running at a low speed, the baffle is retracted into the installation box while the telescopic rod is extended, so that the stirring radius becomes larger, which is beneficial to improving the stirring range, reducing the stirring dead angle generated between the baffle and the inner wall of the tank body after the baffle is extended, so that the material mixing is more uniform, which is beneficial to improving product quality.

[0028] 3. By setting a spoiler and rotating the spoiler, the angle between the spoiler and the direction of fluid movement becomes smaller, so that a dead angle of fluid is formed between the spoiler and the inner wall of the tank body. The fluid swirls after entering the dead angle, further increasing the degree of turbulence caused by the baffle to the liquid material, which is conducive to the full mixing of the liquid raw materials to form a uniform phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of generating a vortex during operation of an existing mixing device;

[0030] Figure 2 This is a schematic diagram of the overall structure of a device for preparing a plant fiber composite material proposed by the present invention;

[0031] Figure 3 This is a schematic diagram of the internal structure of a device for preparing a plant fiber composite material proposed by the present invention;

[0032] Figure 4 This is a schematic structural diagram of a device for preparing a plant fiber composite material in a low-speed operation state provided by the present invention;

[0033] Figure 5 This is a schematic structural diagram of a device for preparing a plant fiber composite material in a high-speed operation state proposed by the present invention;

[0034] Figure 6 This is a schematic structural diagram of a control panel in a device for preparing a plant fiber composite material proposed by the present invention;

[0035] Figure 7This is a schematic structural diagram of a telescopic rod in a device for preparing a plant fiber composite material proposed by the present invention;

[0036] Figure 8 This is a structural schematic diagram of the connection relationship between the mounting plate and the mounting ring in the preparation device of the plant fiber composite material proposed by the present invention;

[0037] Fig. 9 This is a schematic structural diagram of a baffle in a device for preparing a plant fiber composite material proposed by the present invention;

[0038] Fig.10 This is a schematic diagram of the top view of the structure of a baffle in a device for preparing a plant fiber composite material proposed by the present invention.

[0039] In the figure: 1. mounting frame; 2. tank body; 3. motor; 4. rotating shaft; 5. mounting plate; 6. sleeve; 7. telescopic rod; 8. mounting box; 9. baffle; 10. slide bar; 11. counterweight; 12. control board; 13. spring 1; 14. mounting plate; 15. spring 2; 16. guide column; 17. guide groove; 18. mounting ring; 19. connecting rod; 20. pressure column; 21. pressure groove; 22. spoiler; 23. stirring blade. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] Reference Figure 2-3 A preparation device for a plant fiber composite material includes a mounting frame 1, on which a tank body 2 and a motor 3 are provided. A cover body is hinged on the tank body 2 to facilitate the addition of materials. A discharge port is provided at the bottom of the tank body 2. After the objects are mixed, they can be discharged through the discharge port.

[0043] The mounting frame 1 is also provided with a control panel, which is electrically connected to the motor 3. A person skilled in the art can use the control panel to control the start and stop of the motor 3 through simple programming. A rotating shaft 4 is rotatably arranged in the tank body 2, and the motor 3 is transmission-connected to the rotating shaft 4.

[0044] Pulleys are fixedly provided on the output end of the motor 3 and the rotating shaft 4, and the two pulleys are connected by a belt transmission. When the motor 3 rotates, the rotating shaft 4 is driven to rotate by the belt. Connecting the motor 3 and the rotating shaft 4 by belt transmission is beneficial to the subsequent maintenance and replacement of the motor 3.

[0045] A hollow mounting plate 5 is fixedly provided on the rotating shaft 4. The mounting plate 5 is cross-shaped and coaxially arranged on the top of the rotating shaft 4. A plurality of sleeves 6 are evenly distributed on the outer wall of the mounting plate 5. The sleeve 6 is arranged perpendicular to the mounting plate 5. A telescopic rod 7 is slidably arranged in the sleeve 6. When the rotating shaft 4 rotates, the sleeve 6 and the telescopic rod 7 are driven to rotate to achieve stirring and mixing of the liquid material in the tank body 2. The telescopic rod 7 can slide in the sleeve 6 to change the combined length of the sleeve 6 and the telescopic rod 7 to achieve a change in the stirring radius, which is beneficial to expand the stirring range when the equipment is running at a low speed, make the material mixing more uniform, and improve the quality of the product.

[0046] The outer wall of the tank body 2 is provided with a plurality of installation boxes 8 connected with the interior of the tank body 2. The installation boxes 8 are vertically arranged, and a baffle 9 is slidably arranged inside the installation box 8. The baffle 9 can be adaptively extended or retracted according to the rotation speed of the equipment. When the baffle 9 is extended, it is beneficial to increase the turbulence degree of the fluid, so that large particles of easily precipitated materials are evenly dispersed along with the turbulence generated by the baffle 9, which is beneficial to fully mix the liquid raw materials to form a uniform phase.

[0047] A control mechanism for controlling the synchronous extension and retraction of the telescopic rod 7 and the baffle 9 is disposed on the mounting plate 5 .

[0048] In the specific implementation, the raw materials and water are first added into the tank body 2. In the initial state, before the thickener takes effect, the speed of the motor 3 is set to 1500r / min, so that the rotating shaft 4 rotates at a high speed, driving the telescopic rod 7 and the sleeve 6 to quickly stir the liquid raw materials. Under the action of centrifugal force, the liquid material level at the inner wall of the tank body 2 rises, while the liquid material level at the center drops, generating a vortex. The particles in the raw materials are larger in size and higher in quality, and are easily thrown to the edge of the tank body 2 during mixing. At this time, the baffle 9 is controlled by the control mechanism to extend from the installation box 8 into the tank body 2, and the liquid When the material rotates along the inner wall of the tank body 2, it hits the baffle 9, thereby increasing the turbulence of the liquid material, reducing the generation of vortex phenomenon, reducing power fluctuations and abnormal forces generated by the vortex, and increasing the service life of the equipment. At the same time, it reduces useless work in fluid movement and reduces energy consumption. The turbulence generated by the baffle 9 can make some heavier large-particle materials flow with the fluid and disperse in the tank body 2, thereby making the different materials fully mixed to form a uniform phase before the thickener takes effect and increases the viscosity of the liquid raw material, thereby achieving high-quality production of composite materials.

[0049] After stirring and mixing for a period of time, under the action of the thickener, the viscosity of the liquid material increases. At this time, it is no longer necessary to stir the material at a high speed, and the speed of the motor 3 is reduced to 1000r / min. At this time, under the action of the control mechanism, the baffle 9 is hidden in the installation box 8, so that the inner wall of the tank body 2 is fully exposed, and the telescopic rod 7 extends outward from the sleeve 6, which is conducive to increasing the stirring range, reducing the stirring dead angle, and making the material mixing more uniform, which is conducive to improving product quality.

[0050] Reference Figure 4-5 The control mechanism includes a plurality of slide bars 10 fixedly arranged on the mounting plate 5. The slide bars 10 are arranged horizontally. A counterweight block 11 is slidably arranged on the slide bars 10. When the rotating shaft 4 rotates, the slide bars 10 are driven to rotate, so that the counterweight block 11 is thrown outward under the action of centrifugal force. A control plate 12 is slidably arranged in the mounting plate 5. The control plate 12 can move axially in the mounting plate 5. A mounting disk 14 is slidably arranged on the top of the mounting plate 5. A plurality of limit rods are vertically arranged on the top of the mounting plate 5. The mounting disk 14 is slidably connected with the limit rod. The mounting disk 14 is limited by the limit rod, so that the mounting disk 14 can rotate with the mounting plate 5, and the mounting disk 14 can move axially along the limit rod.

[0051] The counterweight block 11 is connected to the mounting plate 14 and the control board 12 respectively through connecting ropes. The two connecting ropes on the same counterweight block 11 are both in a taut state. When the counterweight block 11 is thrown outward, the mounting plate 14 and the control board 12 are pulled by the connecting ropes, so that the mounting plate 14 moves downward and the control board 12 moves upward.

[0052] A second spring 15 is provided between the mounting disk 14 and the mounting plate 5. Under the action of the second spring 15, the mounting disk 14 is normally at the upper position. A second control structure for driving the baffle 9 is provided on the mounting disk 14. Through the second control structure, when the mounting disk 14 moves downward, the baffle 9 is extended into the tank body 2. When the mounting disk 14 is reset, the baffle 9 is reset accordingly.

[0053] A spring 13 is arranged between the control board 12 and the mounting plate 5. Under the action of the spring 13, the control board 12 is normally at the bottom. A control structure 1 for driving the telescopic rod 7 is arranged on the control board 12. Through the control structure 1, when the control board 12 moves upward, the telescopic rod 7 is retracted inward. When the control board 12 is reset, the telescopic rod 7 is reset. Through the elastic force of the spring 13 and the spring 2 15, the counterweight block 11 can be prevented from displacement when the equipment is running at a low speed.

[0054] Therefore, when the equipment is running at a low speed, the telescopic rod 7 is in an extended state and the baffle 9 is in a retracted state. At this time, the materials can be mixed without dead angles. When running at a high speed, the counterweight 11 has a large centrifugal force and moves outward along the slide rod 10, driving the telescopic rod 7 to retract inward and extending the baffle 9 at the same time, thereby achieving the purpose of eliminating the vortex generated under the high-speed operation state.

[0055] Reference Figure 6-7 The control structure 1 includes a guide column 16 fixedly arranged at one end of the telescopic rod 7 near the control board 12. The control board 12 is provided with an inclined guide groove 17. The guide column 16 extends into the guide groove 17 and abuts against the inner wall of the guide groove 17. When the control board 12 is pulled upward by the connecting rope, the guide groove 17 presses the guide column 16. Since the guide groove 17 is inclined, when the guide column 16 is pressed, the guide column 16 drives the telescopic rod 7 to retract inward.

[0056] Reference Figure 4-5 The second control structure includes a mounting ring 18 rotatably sleeved on the mounting disk 14, and a plurality of connecting rods 19 are fixedly arranged on the outer circumference of the mounting ring 18. A pressure column 20 is fixedly arranged at one end of the connecting rod 19 close to the baffle 9. A cavity is provided in the baffle 9, and the connecting rod 19 extends into the cavity. When the rotating shaft 4 rotates to drive the mounting disk 14 to rotate, the mounting ring 18 will not rotate. An inclined pressure groove 21 is provided in the cavity, and the pressure column 20 extends into the pressure groove 21 and abuts against the inner wall of the pressure groove 21. When the mounting disk 14 is pulled downward by the connecting rope, the pressure groove 21 presses the pressure column 20. Since the pressure groove 21 is inclined, when the pressure column 20 is pressed, the pressure column 20 drives the baffle 9 to slide out of the tank body 2.

[0057] Reference Figure 3 A plurality of stirring blades 23 are fixedly arranged on the outer peripheral surface of the rotating shaft 4. The stirring blades 23 are located at the bottom of the tank body 2. The stirring blades 23 stir the bottom of the tank body 2, which is conducive to forming a circulating flow effect of the liquid material.

[0058] Reference Figure 3 The stirring blade 23 is spirally arranged, and the torsion angle of the stirring blade 23 is 90 degrees. When the stirring blade 23 rotates, the fluid located at the center of the tank body 2 flows downward, and the fluid located at the edge of the tank body 2 flows upward, so that the liquid material flows upward along the inner wall of the tank body 2 and then flows back to the center of the tank body 2 for replenishment, forming a fluid circulation effect, further improving the mixing effect.

[0059] Further, see Figure 9-10The baffle plate 9 is provided with an installation opening, in which a spoiler 22 is rotatably arranged, and the shaft of the spoiler 22 is arranged on the side of the installation opening close to the rotating shaft 4, and the spoiler 22 can rotate under the impact of the fluid, and two limit columns are fixedly arranged on the inner wall of the installation opening, and the two limit columns are symmetrically distributed on both sides of the spoiler 22, and the limit columns are used to limit the rotation angle of the spoiler 22 to prevent the spoiler 22 from opening and closing at too large an angle and being difficult to reset. When the fluid hits the spoiler 22, the spoiler 22 is rotated and abuts against the limit columns, thereby reducing the angle between the spoiler 22 and the direction of fluid movement, so that a fluid dead angle is formed between the spoiler 22 and the inner wall of the tank body 2, and the fluid swirls after entering the dead angle, further improving the turbulence degree caused by the baffle 9 to the liquid material, so that different materials are fully mixed to form a uniform phase, thereby achieving high-quality production of composite materials.

[0060] The specific working principle of the preparation device in the present invention is as follows:

[0061] When in use, first add the raw material and water into the tank body 2. In the initial state, before the thickener takes effect, set the speed of the motor 3 to 1500r / min, so that the rotating shaft 4 rotates at a high speed, driving the telescopic rod 7 and the sleeve 6 to quickly stir the liquid raw material. The baffle 9 is controlled by the control mechanism to extend from the installation box 8 into the tank body 2. When the liquid material rotates along the inner wall of the tank body 2, it hits the baffle 9, thereby increasing the turbulence of the liquid material, reducing the generation of vortex phenomenon, reducing the power fluctuation and abnormal force generated by the vortex, and increasing the service life of the equipment. The turbulence generated by the baffle 9 can make some heavier large-particle materials flow with the fluid and disperse in the tank body 2, thereby making the liquid material fully mixed with different materials to form a uniform phase before the thickener takes effect and increases the viscosity of the liquid raw material, thereby achieving high-quality production of composite materials;

[0062] After stirring and mixing for a period of time, under the action of the thickener, the viscosity of the liquid material increases. At this time, it is no longer necessary to stir the material at a high speed, and the speed of the motor 3 is reduced to 1000r / min. At this time, under the action of the control mechanism, the baffle 9 is hidden in the installation box 8, so that the inner wall of the tank body 2 is fully exposed, and the telescopic rod 7 extends outward from the sleeve 6, which is conducive to increasing the stirring range, reducing the stirring dead angle, and making the material mixing more uniform, which is conducive to improving product quality.

[0063] A method for preparing a plant fiber composite material comprises the following steps:

[0064] S1: First, wash the Salix psammophila branches, and then put them into a cutting machine and cut them into small pieces with a length of 1 cm;

[0065] S2: putting the cut straw and shrub short strips into a 100°C cooking pot for pretreatment for 3 minutes;

[0066] S3: washing and drying the corn stalks, and separating the husk and pith from the stalks using a husk and pith separation device;

[0067] S4: crushing corn stalks into 60 mesh powder by crusher, crushing Salix psammophila branches into 100 mesh powder, grinding stalks, bone glue and xanthan gum into powder to obtain 20 mm crushed materials, and then grinding the crushed materials with a grinder to make the particle size reach 100 mesh;

[0068] S5: Add water to the above raw materials in proportion and put them into a high-speed mixer, mix and react for 1 hour at a speed of 1500r / min. After the viscosity of the raw material mixture increases significantly, reduce the speed, continue mixing and reacting at a speed of 1000r / min for 1 hour, cool to 50-70°C and discharge;

[0069] S6: putting the slurry into a square mold of a hot press, selecting 140° C., 170° C., and 200° C. as the three-level hot pressing temperatures of the hot press, selecting 3.5, 5.0, and 6.5 MPa as the three-level hot pressing pressures of the hot press, and hot pressing and shaping the slurry;

[0070] S7: Use a universal testing machine to perform a tensile test and a three-point bending test on the bio-board to measure the tensile strength and bending strength of the bio-board;

[0071] S8: Measure the water resistance and water absorption of the bio-board using an angular contact meter and a water immersion test. Example

[0072] A plant fiber composite material comprises the following components in mass fractions: 64 parts of corn straw fiber, 30 parts of Salix psammophila, 7.5 parts of corn straw pith, 14 parts of bone glue, 10.5 parts of xanthan gum, 2 parts of heat stabilizer and 15 parts of colorant, wherein the corn straw fiber is selected from powder with a particle size of 60 meshes, the Salix psammophila branches are ground into powder with a particle size of 100 meshes, the heat stabilizer is stearic acid, and the colorant is white pigment.

[0073] Corn straw fiber is mechanically crushed to obtain fiber powder. However, fiber powders of different particle sizes are subjected to different forces during crushing, so the surface roughness and aspect ratio of fiber powders of different particle sizes are also different. Generally speaking, the surface roughness of fiber powder increases with the increase of particle size, and the surface roughness of fiber powder has a great influence on the mechanical properties of composite materials. The particle size of corn straw fiber powder is 60 mesh.

[0074] Salix psammophila is a short fiber raw material with high fiber cell content and cellulose content and good fiber morphology, making it an ideal raw material for pulping, papermaking and fiberboard. The wood fiber of the 100-mesh powder is ground from the branches of Salix psammophila, and its mechanical properties and water resistance are better than those of plant fibers, so it can be used as a reinforcing material for artificial fiberboard.

[0075] Corn stalk pith is rich in nutrients such as sugar and crude protein. Sugar substances can become viscous at high temperatures. Therefore, adding a small amount of corn stalk pith during the hot pressing process can serve as an adhesive to enhance the strength of the bioboard.

[0076] Since the cellulose and hemicellulose in the straw have high crystallinity and good compatibility with the matrix glue, adding different amounts of glue has a certain effect on the mechanical properties of the bio-board. Xanthan gum plays a role in thickening and stabilizing the raw materials during hot pressing. Too high or too low can make the fluidity of the mixed raw materials worse.

[0077] Stearic acid can be used as a heat stabilizer during the hot pressing process of bio-boards to prevent the bio-boards from "burning"; white pigment, as a safe food-grade colorant, can increase the gloss of the bio-boards. Example

[0078] A plant fiber composite material comprises the following components in mass fractions: 72 parts of corn straw fiber, 23 parts of Salix psammophila, 7.5 parts of corn straw pith, 14 parts of glue, 15 parts of xanthan gum, 2 parts of heat stabilizer and 15 parts of colorant, wherein the corn straw fiber is selected to have a powder particle size of 60 meshes, the Salix psammophila branches are ground into powdered wood fiber with a particle size of 100 meshes, the heat stabilizer is stearic acid, and the colorant is white pigment. Example

[0079] A plant fiber composite material comprises the following components in mass fractions: 56 parts of corn straw fiber, 30 parts of Salix psammophila, 7.5 parts of corn straw pith, 14 parts of glue, 15 parts of xanthan gum, 3 parts of heat stabilizer and 17 parts of colorant, wherein the corn straw fiber is selected to have a powder particle size of 60 meshes, the Salix psammophila branches are ground into powdered wood fiber with a particle size of 100 meshes, the heat stabilizer is stearic acid, and the colorant is white pigment. Example

[0080] A plant fiber composite material comprises the following components in mass fractions: 64 parts of corn straw fiber, 30 parts of Salix psammophila, 5 parts of corn straw pith, 10 parts of glue, 6 parts of xanthan gum, 3 parts of heat stabilizer and 17 parts of colorant, wherein the corn straw fiber is selected to have a powder particle size of 60 meshes, the Salix psammophila branches are ground into powdered wood fiber with a particle size of 100 meshes, the heat stabilizer is stearic acid, and the colorant is white pigment. Example

[0081] A plant fiber composite material comprises the following components in mass fractions: 64 parts of corn straw fiber, 23 parts of Salix psammophila, 5 parts of corn straw pith, 14 parts of glue, 10.5 parts of xanthan gum, 4 parts of heat stabilizer and 19 parts of colorant, wherein the corn straw fiber is selected to have a powder particle size of 60 meshes, the Salix psammophila branches are ground into powdered wood fiber with a particle size of 100 meshes, the heat stabilizer is stearic acid, and the colorant is white pigment. Example

[0082] A plant fiber composite material comprises the following components in mass fractions: 64 parts of corn straw fiber, 30 parts of Salix psammophila, 10 parts of corn straw pith, 18 parts of glue, 10.5 parts of xanthan gum, 5 parts of heat stabilizer and 19 parts of colorant, wherein the corn straw fiber is selected to have a powder particle size of 60 meshes, the Salix psammophila branches are ground into powdered wood fiber with a particle size of 100 meshes, the heat stabilizer is stearic acid, and the colorant is white pigment. Example

[0083] A plant fiber composite material comprises the following components in mass fractions: 56 parts of corn straw fiber, 37 parts of Salix psammophila, 5 parts of corn straw pith, 18 parts of glue, 6 parts of xanthan gum, 7 parts of heat stabilizer and 20 parts of colorant, wherein the corn straw fiber is selected to have a powder particle size of 60 meshes, the Salix psammophila branches are ground into powdered wood fiber with a particle size of 100 meshes, the heat stabilizer is stearic acid, and the colorant is white pigment. Example

[0084] A plant fiber composite material comprises the following components in mass fractions: 72 parts of corn straw fiber, 37 parts of Salix psammophila, 10 parts of corn straw pith, 10 parts of bone glue, 15 parts of xanthan gum, 5 parts of heat stabilizer and 19 parts of colorant, wherein the corn straw fiber is selected to have a powder particle size of 60 meshes, the Salix psammophila branches are ground into powdered wood fiber with a particle size of 100 meshes, the heat stabilizer is stearic acid, and the colorant is white pigment.

[0085] In the above embodiment, the obtained plant fiber composite material has the best performance under the following mass fraction ratio of components, including 64 parts of corn straw fiber, 30 parts of Salix psammophila, 7.5 parts of corn straw pith, 14 parts of bone glue, 10.5 parts of xanthan gum, 2 parts of heat stabilizer and 15 parts of colorant.

[0086] The recorded data are as follows:

[0087]

[0088] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for preparing a plant fiber composite material, comprising a mounting frame (1), wherein a tank body (2) and a motor (3) are provided on the mounting frame (1), a rotating shaft (4) is rotatably provided in the tank body (2), and the motor (3) is drivingly connected to the rotating shaft (4), characterized in that: A hollow mounting plate (5) is fixedly arranged on the rotating shaft (4), a plurality of sleeves (6) are evenly distributed on the outer wall of the mounting plate (5), a telescopic rod (7) is slidably arranged in the sleeve (6), a plurality of mounting boxes (8) connected to the interior of the tank body (2) are arranged on the outer wall of the tank body (2), a baffle (9) is slidably arranged in the mounting box (8), and a control mechanism for controlling the synchronous extension and retraction of the telescopic rod (7) and the baffle (9) is provided on the mounting plate (5); The control mechanism comprises a plurality of slide bars (10) fixedly arranged on the mounting plate (5), a counterweight block (11) being slidably arranged on the slide bars (10), a control plate (12) being slidably arranged inside the mounting plate (5), a mounting plate (14) being slidably arranged on the top of the mounting plate (5), a second spring (15) being arranged between the mounting plate (14) and the mounting plate (5), a second control structure for driving the baffle (9) being arranged on the mounting plate (14), a first spring (13) being arranged between the control plate (12) and the mounting plate (5), and a first control structure for driving the telescopic rod (7) being arranged on the control plate (12); The control structure 1 comprises a guide column (16) fixedly arranged on one end of the telescopic rod (7) close to the control panel (12); the control panel (12) is provided with an inclined guide groove (17); the guide column (16) extends into the guide groove (17) and abuts against the inner wall of the guide groove (17); The second control structure comprises a mounting ring (18) rotatably sleeved on the mounting plate (14), a plurality of connecting rods (19) being fixedly arranged on the outer peripheral surface of the mounting ring (18), a pressure column (20) being fixedly arranged at one end of the connecting rod (19) close to the baffle plate (9), a cavity being provided in the baffle plate (9), a pressure groove (21) being obliquely provided in the cavity, and the pressure column (20) extending into the pressure groove (21) and abutting against the inner wall of the pressure groove (21); The counterweight block (11) is connected to the mounting plate (14) and the control panel (12) respectively via connecting ropes, and the two connecting ropes on the same counterweight block (11) are both in a taut state.

2. The device for preparing a plant fiber composite material according to claim 1, characterized in that: A plurality of limit rods are vertically arranged on the top of the mounting plate (5), and the mounting plate (14) is slidably connected to the limit rods.

3. The device for preparing a plant fiber composite material according to claim 1, characterized in that: A plurality of stirring blades (23) are fixedly arranged on the outer peripheral surface of the rotating shaft (4), and the stirring blades (23) are located at the bottom of the tank body (2).

4. The device for preparing a plant fiber composite material according to claim 3, characterized in that: The stirring blade (23) is arranged in a spiral shape, and the torsion angle of the stirring blade (23) is 90 degrees.

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