Novel graphite straw composite thermal insulation material and preparation method and device thereof

Abstract

The invention belongs to the technical field of straw thermal insulation materials, and particularly relates to a novel graphite straw composite thermal insulation material and a preparation method and device thereof.The novel graphite straw composite thermal insulation material is prepared from, by weight, 75-95 parts of graphite corn straw particles, 50-60 parts of graphite polystyrene particles, 45-53 parts of glass beads, 20-30 parts of cement and 15-28 parts of silica fume; the graphite corn straw particles are prepared from 60%-75% of corn straw, 10%-25% of graphite, 8%-15% of water-based resin and 2%-10% of an additive; the graphite corn straw particles and the graphite polystyrene particles are main thermal insulation materials, the fireproof performance of the thermal insulation board can be improved by adding the glass bead particles, and the thermal insulation materials and the fireproof materials are bonded together through the cement and the silica fume. The graphite straw composite insulation board prepared on the basis has excellent heat insulation property, environmental protection property, flame retardance and mechanical property, the comprehensive utilization of the straw is accelerated, the air pollution is reduced, the thermal insulation property of a building structure is improved, and the energy efficiency of the building industry is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of straw thermal insulation materials, and particularly relates to a novel graphite-straw composite thermal insulation material, a preparation method thereof, and a device therefor. Background Art

[0002] The energy consumption in the construction industry accounts for a large share of the world's energy consumption. In recent years, with the rapid development of the construction industry, the total energy consumption has been continuously increasing. Improving energy efficiency has gradually become the focus of attention of the whole society. Therefore, the development of high-efficiency energy-saving technologies in the construction industry is very necessary. Adopting an envelope structure in a building is an effective method to improve the building's thermal insulation performance and can greatly improve the energy efficiency of the construction industry. The construction cost of the building envelope structure accounts for about 15%-40% of the total construction cost. However, its contribution to the cost of the building's entire life cycle, especially the energy cost, is about 60%. Therefore, the thermal insulation performance of the envelope structure will directly determine the contribution of the energy cost.

[0003] How to accelerate the comprehensive utilization of straw and reduce air pollution has become a major issue that needs to be urgently solved by scientific research workers in China and even the world. Straw fiber has a small thermal conductivity coefficient and can be used to prepare graphite composite thermal insulation materials for application in the building envelope structure, which is an effective way to solve the resource utilization of crop straw.

[0004] Currently, the mainstream building thermal insulation materials on the market mainly include organic types (such as EPS, XPS, polyurethane foam) and inorganic types (such as rock wool, expanded perlite, aerogel), but they all have significant defects. Organic thermal insulation materials are flammable and release toxic gases (such as HCN, CO) when burned, posing a great fire hazard. Their raw materials rely on petrochemical resources, with high production energy consumption, and are difficult to degrade after being discarded, exacerbating "white pollution". Inorganic thermal insulation materials have fibers that are prone to moisture absorption and sedimentation, resulting in a decline in thermal insulation performance after long-term use, being brittle, having low compressive strength, and being costly.

[0005] Therefore, the present invention provides a novel graphite-straw composite thermal insulation material, a preparation method thereof, and a device therefor. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A novel graphite-straw composite thermal insulation material of the present invention is composed of the following raw materials in parts by weight: 75-95 parts of graphite corn straw particles, 50-60 parts of graphite polystyrene particles, 45-53 parts of expanded perlite, 20-30 parts of cement, and 15-28 parts of silica fume;

[0008] The graphite corn straw particles are prepared from 60%-75% corn straw, 10%-25% graphite, 8%-15% water-based resin, and 2%-10% additive;

[0009] Among them, the additive is a mixture of aluminum hydroxide, silane coupling agent, and zinc borate.

[0010] A preparation method of a novel graphite straw composite thermal insulation material, which is used to prepare the above-mentioned novel graphite straw composite thermal insulation material, includes the following steps:

[0011] A1: Use a rolling water washing device to wash the corn straw and dry it until the moisture content is less than 5%;

[0012] A2: Immerse the corn straw in a 5%-10% NaOH solution for 2-4 hours to improve the fiber activity, then rinse it with dilute hydrochloric acid or water until neutral, and cut and crush it into 1-5 mm particles after drying again;

[0013] A3: Mix graphite with deionized water at a ratio of 1:10, ultrasonically disperse for 30 minutes, add 1%-2% of the silane coupling agent based on the mass of graphite, and heat and stir for 1 hour to obtain modified graphite;

[0014] A4: Stir and mix the corn straw particles, modified graphite, water-based resin, and additive, and extrude the mixture into particles with a diameter of 3-8 mm through a screw extruder to obtain graphite corn straw particles;

[0015] A5: Heat and stir and mix the graphite corn straw particles, graphite polystyrene particles, expanded perlite, cement, and silica fume for 20-30 minutes, then put the mixture into a mold for molding, and cure it at normal temperature or by heating for 24-48 hours to obtain the graphite straw composite thermal insulation material.

[0016] Among them, the specific operation steps of the rolling water washing device in step A1 are as follows:

[0017] A11: Place the straw on the surface of the conveying component. Driven by the conveying component, the straw gradually moves into the gantry, and the water spraying component sprays water on the surface of the straw for cleaning;

[0018] A12: When the straw passes under the side rolling component, control the turntable to rotate through the motor, and use the connecting rod to drive the translation seat to move left and right reciprocally. The translation seat continuously rolls the straw laterally and makes it roll laterally;

[0019] A13: The water inside the water supply pipe enters the cavity of the translation seat through the corrugated pipe, and then sprays downward along multiple guide holes, so that the translation seat sprays water on the straw while rolling it;

[0020] A14: When the translation base moves towards the baffle, the air inside the elastic member is squeezed into the tops of multiple pressure cylinders after being squeezed, driving the movable block and the puncture rod to move downward. The puncture rod pierces into the interior of the straw, causing the straw to rupture and form cracks, facilitating the entry of water into the straw to wash away impurities.

[0021] A preparation device for a new type of graphite straw composite thermal insulation material, which is applicable to the above preparation method. The rolling water washing device described in step A1 includes a washing pool, a gantry, a conveying component, a water spraying component, and a lateral rolling component; the gantry is arranged above the washing pool;

[0022] The conveying component is arranged on the top of the washing pool; the conveying component is used to convey the straw to move and pass under the water spraying component; the water spraying component is arranged inside the gantry; the water spraying component is used to spray and wash the straw on the surface of the conveying component;

[0023] The lateral rolling component is arranged inside the gantry; the lateral rolling component is used to control the lateral rolling of the straw on the surface of the conveying component; the lateral rolling component includes a group of limiting plates fixedly connected to the top of the washing pool; a translation base is arranged between the limiting plates; sliding grooves are formed on the surfaces of the limiting plates; a slider is fixedly connected to the side surface of the translation base, and the slider is slidably connected inside the sliding groove; a turntable is rotatably connected inside the gantry, and the turntable is connected to a motor; a connecting rod is hinged between the edge of the end face of the turntable and the translation base.

[0024] Preferably, the water spraying component includes a group of strip-shaped water spraying members; a group of water spraying holes are evenly distributed on the lower side of the strip-shaped water spraying members; the strip-shaped water spraying members are communicated with a water supply pipe through a connecting pipe, and the water supply pipe is connected to an external water source.

[0025] Preferably, the conveying component includes a group of conveying rollers, and the conveying rollers are connected with a driving mechanism; a conveyor belt is sleeved on the surface of the conveying rollers; a guide wheel is rotatably connected at a position corresponding to the translation base inside the washing pool, and the guide wheel is attached to the upper side of the conveyor belt; the heights of the conveying rollers on both sides of the guide wheel are different.

[0026] Preferably, the conveyor belt is designed as a mesh; there is a gap between adjacent conveying rollers.

[0027] Preferably, a cavity is formed inside the translation base; an elastic corrugated pipe is communicated between the cavity and the water supply pipe; a group of guide holes are evenly distributed between the cavity and the lower side of the translation base.

[0028] Preferably, a group of pressure cylinders are evenly distributed inside the cavity; a movable block is slidably and sealingly connected inside the pressure cylinder; a spring is fixedly connected between the upper side of the movable block and the pressure cylinder; a puncture rod is fixedly connected to the lower side of the movable block; the tip of the bottom of the puncture rod faces the guide hole, and the diameter of the guide hole is larger than that of the puncture rod;

[0029] One side of the translation base away from the connecting rod is fixedly connected with an elastic member; the elastic member is designed as a hollow structure, and a conduit is communicated between the elastic member and the tops of a plurality of pressure cylinders; a baffle is fixedly connected to the top of the cleaning pool at a position corresponding to the elastic member.

[0030] Preferably, the bottom of the puncture rod and the end of the pressure cylinder are in sliding seal connection; a water inlet is communicated between the bottom of the pressure cylinder and the cavity; a drainage hole is formed inside the puncture rod, and the top of the drainage hole is communicated with the pressure cylinder; one-way valves are arranged inside both the water inlet and the drainage hole.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. For a novel graphite straw composite thermal insulation material, its preparation method and device according to the present invention, graphite corn straw particles and graphite polystyrene particles are the main thermal insulation materials. The addition of vitrified microbead particles can improve the fire resistance of the thermal insulation board. Cement and silica fume bond the thermal insulation material and the fireproof material together. The graphite straw composite thermal insulation board prepared on this basis has excellent heat insulation, environmental protection, flame retardancy and mechanical properties, accelerates the comprehensive utilization of straw, reduces air pollution, improves the thermal insulation performance of building structures, and improves the energy efficiency of the building industry.

[0033] 2. For a novel graphite straw composite thermal insulation material, its preparation method and device according to the present invention, the straw is placed on the surface of the conveying assembly. Then, driven by the conveying assembly, the straw gradually moves into the gantry. The water spraying assembly sprays water on the surface of the straw to clean it. And when the straw passes under the side rolling assembly, the motor is controlled to rotate the turntable, and the connecting rod drives the translation base to reciprocate left and right above the conveying assembly. Then, the translation base continuously laterally rolls the straw on the surface of the conveying assembly and drives the straw to roll laterally, which can promote the straw to be quickly flattened and dispersed along the width direction of the cleaning pool, prevent the straw from piling up so that the innermost straw cannot be washed by the water flow, and on the other hand, the straw can continuously change the cleaning surface during the rolling process, so that the surface of the straw can be evenly washed by the water flow. In addition, since the straw is usually a hollow structure and there are also a large amount of debris impurities such as cellulose, lignin, and soil inside it, the rolling action of the translation base on the straw can promote the straw to break, which is beneficial for the water flow to enter the inside of the straw for cleaning. Brief Description of the Drawings

[0034] The present invention will be further described below with reference to the drawings.

[0035] Figure 1 It is a schematic diagram of the preparation method of the graphite straw composite thermal insulation material in the present invention;

[0036] Figure 2It is a specific operation schematic diagram of the rolling water washing device in the present invention;

[0037] Figure 3 It is a structural schematic diagram of the rolling water washing device in the present invention;

[0038] Figure 4 It is a structural schematic diagram of the cleaning pool in the present invention;

[0039] Figure 5 It is Figure 4 The partial enlarged view at position A in;

[0040] Figure 6 It is a cross-sectional view of the conveyor belt in the present invention;

[0041] Figure 7 It is a partial cross-sectional view of the translation base in the present invention;

[0042] Figure 8 It is Figure 7 The partial enlarged view at position B in.

[0043] In the figure: cleaning pool 1, gantry 2, limit plate 3, translation base 4, sliding groove 5, slider 6, turntable 7, motor 8, connecting rod 9, strip-shaped water spraying part 10, series connection pipe 11, water supply pipe 12, conveying roller 13, conveyor belt 14, guide wheel 15, cavity 16, corrugated pipe 17, guide hole 18, pressure cylinder 19, movable block 20, spring 21, puncture rod 22, elastic part 23, conduit 24, baffle 25, water inlet 26, drain hole 27. Specific embodiments

[0044] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0045] A new type of graphite straw composite thermal insulation material described in the present invention is composed of the following raw materials in parts by weight: 75 - 95 parts of graphite corn straw particles, 50 - 60 parts of graphite polystyrene particles, 45 - 53 parts of vitrified microspheres, 20 - 30 parts of cement, and 15 - 28 parts of silica fume;

[0046] The graphite corn straw particles are prepared from 60% - 75% of corn straw, 10% - 25% of graphite, 8% - 15% of water-based resin, and 2% - 10% of additives;

[0047] Among them, the additive is a mixture of aluminum hydroxide, silane coupling agent, and zinc borate.

[0048] Graphite corn straw particles and graphite polystyrene particles are the main thermal insulation materials. The addition of vitrified microsphere particles can improve the fire resistance of the thermal insulation board. Cement and silica fume bond the thermal insulation materials and fireproof materials together. The graphite straw composite thermal insulation board prepared on this basis has excellent heat insulation, environmental protection, flame retardancy and mechanical properties. Its thermal conductivity can be as low as 0.035 - 0.06 W / (m·K), which is better than traditional EPS foam. It has a high biodegradation rate and the carbon emissions are reduced by more than 50% compared with petrochemical-based materials. Graphite combined with vitrified microspheres has an extremely high melting point and chemical stability, will not burn at high temperatures, and will not release toxic gases. The compressive strength of the finished thermal insulation board can reach 1 - 5 MPa.

[0049] In this invention, straw is used as the thermal insulation material. On the one hand, it can accelerate the comprehensive utilization of straw and reduce air pollution. On the other hand, by adding flame retardants to ensure the fire resistance of the straw material, the straw material can greatly reduce the thermal conductivity of the existing thermal insulation materials, improve the thermal insulation performance of the building structure, and improve the energy efficiency of the building industry.

[0050] As Figures 1 to 2 shown, a preparation method of a novel graphite straw composite thermal insulation material described in this invention, which is used to prepare the above-mentioned novel graphite straw composite thermal insulation material, includes the following steps:

[0051] A1: Clean the corn straw with a rolling water washing device and dry it until the moisture content is less than 5%;

[0052] A2: Immerse the corn straw in a 5% - 10% NaOH solution for 2 - 4 hours to improve the fiber activity, then rinse it with dilute hydrochloric acid or clean water until neutral, and cut and crush it into 1 - 5 mm particles after drying again;

[0053] A3: Mix graphite with deionized water at a ratio of 1:10, ultrasonically disperse for 30 minutes, add 1% - 2% of the silane coupling agent based on the mass of graphite, and heat and stir for 1 hour to obtain modified graphite;

[0054] A4: Stir and mix the corn straw particles, modified graphite, water-based resin, and additives, and extrude the mixture into particles with a diameter of 3 - 8 mm through a screw extruder to obtain graphite corn straw particles;

[0055] A5: Heat and stir and mix the graphite corn straw particles, graphite polystyrene particles, vitrified microspheres, cement, and silica fume for 20 - 30 minutes, then put the mixture into a mold for molding, and cure it at normal temperature or by heating for 24 - 48 hours to obtain the graphite straw composite thermal insulation material.

[0056] Among them, the specific operation steps of the rolling water washing device in step A1 are:

[0057] A11: Place the straw on the surface of the conveying component. Driven by the conveying component, the straw gradually moves into the interior of the gantry 2, and the water spraying component sprays water on the surface of the straw for cleaning.

[0058] A12: When the straw passes under the side rolling component, the motor 8 is used to control the rotation of the turntable 7, and the connecting rod 9 is used to drive the translation seat 4 to reciprocate left and right. The translation seat 4 continuously rolls the straw laterally and makes it roll laterally.

[0059] A13: The water inside the water supply pipe 12 enters the cavity 16 of the translation seat 4 through the corrugated pipe 17, and then sprays downward along a plurality of guide holes 18, so that the translation seat 4 sprays water on the straw while rolling the straw.

[0060] A14: When the translation seat 4 moves towards the baffle 25, the air inside the elastic member 23 enters the tops of a plurality of pressure cylinders 19 after being squeezed, driving the movable block 20 and the puncture rod 22 to move downward. The puncture rod 22 pierces into the straw, causing the straw to break and crack, facilitating the entry of water into the straw to wash away impurities.

[0061] As Figures 3 to 8 shown, for the preparation device of a new type of graphite straw composite thermal insulation material described in the present invention, this device is applicable to the above preparation method. In step A1, the rolling and washing device includes a cleaning pool 1, a gantry 2, a conveying component, a water spraying component, and a side rolling component; the gantry 2 is arranged above the cleaning pool 1;

[0062] The conveying component is arranged on the top of the cleaning pool 1; the conveying component is used to convey the straw to move and pass under the water spraying component; the water spraying component is arranged inside the gantry 2; the water spraying component is used to spray water on the straw on the surface of the conveying component for cleaning.

[0063] The side rolling component is arranged inside the gantry 2; the side rolling component is used to control the lateral rolling of the straw on the surface of the conveying component; the side rolling component includes a group of limiting plates 3 fixedly connected to the top of the cleaning pool 1; a translation seat 4 is arranged between the limiting plates 3; sliding grooves 5 are formed on the surfaces of the limiting plates 3; a slider 6 is fixedly connected to the side of the translation seat 4, and the slider 6 is slidably connected inside the sliding groove 5; a turntable 7 is rotatably connected inside the gantry 2, and the turntable 7 is connected to a motor 8; a connecting rod 9 is hinged between the edge of the end face of the turntable 7 and the translation seat 4.

[0064] When this device is in use, the straw is placed on the surface of the conveying component. Then, driven by the conveying component, the straw gradually moves into the interior of the gantry 2. The water spraying component sprays water on the surface of the straw to clean it. And when the straw passes under the lateral rolling component, the motor 8 is used to control the rotation of the turntable 7, and the connecting rod 9 is used to drive the translation seat 4 to reciprocate left and right above the conveying component. Then, the translation seat 4 continuously laterally rolls over the straw on the surface of the conveying component and drives the straw to roll laterally, which can promote the straw to be quickly flattened and dispersed along the width direction of the cleaning pool 1, prevent the straw from piling up together so that the innermost straw cannot be washed by the water flow, and the straw can continuously change the cleaning surface during the rolling process, so that the surface of the straw can be evenly washed by the water flow. On the other hand, since the straw is usually a hollow structure and there are also a large amount of debris impurities such as cellulose, lignin, and soil inside it, the rolling action of the translation seat 4 on the straw can promote the straw to break, which is beneficial for the water flow to enter the interior of the straw for cleaning.

[0065] As a preferred embodiment of the present invention, the water spraying component includes a group of strip-shaped spraying parts 10; a group of spraying holes are evenly distributed on the lower side of the strip-shaped spraying parts 10; the strip-shaped spraying parts 10 are connected to a water supply pipe 12 through a connecting pipe 11, and the water supply pipe 12 is connected to an external water source. Clean water is transported to the water supply pipe 12 by the external water source, and the water flow sprays downward along the water supply pipe 12, the connecting pipe 11, the strip-shaped spraying parts 10, and the spraying holes to wash the straw on the surface of the conveying component.

[0066] As a preferred embodiment of the present invention, the conveying component includes a group of conveying rollers 13, and the conveying rollers 13 are connected with a driving mechanism; a conveyor belt 14 is sleeved on the surface of the conveying rollers 13; a guide wheel 15 is rotatably connected at a position corresponding to the translation seat 4 inside the cleaning pool 1, and the guide wheel 15 is attached to the upper side of the conveyor belt 14; the heights of the conveying rollers 13 on both sides of the guide wheel 15 are different, so the heights of the conveyor belt 14 on both sides of the guide wheel 15 are also different. Below the translation seat 4, the conveyor belt 14 shows a stepped increase along its moving direction, and the distance between the lower part of the conveyor belt 14 and the translation seat 4 is greater than the diameter of the straw, and the distance between the higher part of the conveyor belt 14 and the translation seat 4 is slightly smaller than the diameter of the straw. Then, when the straw moves with the conveyor belt 14, the straw can smoothly enter the gap between the lower side of the translation seat 4 and the conveyor belt 14, and when the straw moves to the higher part of the conveyor belt 14, the straw can smoothly fit with the lower side of the translation seat 4, so that the translation seat 4 can smoothly roll over the straw and drive it to roll laterally. After that, the conveyor belt 14 drives the straw to gradually pass under the translation seat 4.

[0067] The conveyor belt 14 is designed as a mesh; there is a gap between adjacent conveying rollers 13. The sewage and impurities generated during the cleaning process can fall downward through the mesh conveyor belt 14 and the gap between the conveying rollers 13 into the cleaning pool 1 for collection.

[0068] As a preferred embodiment of the present invention, a cavity 16 is formed inside the translation base 4; an elastic corrugated pipe 17 is connected between the cavity 16 and the water supply pipe 12; a group of guide holes 18 are evenly distributed between the cavity 16 and the lower side of the translation base 4. During the cleaning process, the water inside the water supply pipe 12 can enter the cavity 16 inside the translation base 4 synchronously through the corrugated pipe 17, so that the cavity 16 is filled with clean water. Then the water sprays downward along the plurality of guide holes 18, so that the translation base 4 sprays water on the straw while rolling it, improving the cleaning efficiency of the straw.

[0069] As a preferred embodiment of the present invention, a group of pressure cylinders 19 are evenly distributed inside the cavity 16; a movable block 20 is slidably and sealingly connected inside the pressure cylinder 19; a spring 21 is fixedly connected between the upper side of the movable block 20 and the pressure cylinder 19; a puncture rod 22 is fixedly connected to the lower side of the movable block 20; the tip of the bottom of the puncture rod 22 faces the guide hole 18, and the diameter of the guide hole 18 is larger than that of the puncture rod 22;

[0070] An elastic member 23 is fixedly connected to the side of the translation base 4 away from the connecting rod 9; the elastic member 23 is designed as a hollow structure, and a conduit 24 is connected between the elastic member 23 and the tops of the plurality of pressure cylinders 19; a baffle 25 is fixedly connected to the top of the cleaning pool 1 at a position corresponding to the elastic member 23.

[0071] As the translation base 4 reciprocates laterally, when the translation base 4 moves towards the baffle 25, the elastic member 23 will be squeezed by the baffle 25. Then the air inside the elastic member 23 enters the tops of the plurality of pressure cylinders 19 through the conduit 24, promoting the increase of the pressure inside the pressure cylinder 19, driving the movable block 20 and the puncture rod 22 to move downward. Further, the puncture rod 22 extends downward through the guide hole 18 and pierces into the straw, further causing the straw to break and crack, facilitating the water flow to enter the hollow structure of the straw through the cracks to clean impurities. When the elastic member 23 moves away from the baffle 25, it automatically expands and restores, and the spring 21 drives the movable block 20 and the puncture rod 22 to reset upward.

[0072] A sliding seal connection is provided between the bottom of the puncture rod 22 and the end of the pressure cylinder 19; a water inlet 26 is connected between the bottom of the pressure cylinder 19 and the cavity 16; a drain hole 27 is formed inside the puncture rod 22, and the top of the drain hole 27 is connected to the pressure cylinder 19; check valves are provided inside both the water inlet 26 and the drain hole 27. When the movable block 20 moves upward, negative pressure is generated inside the bottom of the pressure cylinder 19, and water in the cavity 16 is sucked into the bottom of the pressure cylinder 19 through the water inlet 26. Then, when the movable block 20 moves downward, the water inside the bottom of the pressure cylinder 19 can be compressed and extruded outwards through the drain hole 27, so that while the puncture rod 22 pierces into the interior of the straw, the pressurized water can be introduced into the interior of the straw by the tip of the puncture rod 22, and the impurities inside the straw can be carried outwards by the water flow, further improving the cleaning degree of the interior of the straw.

[0073] The above front, back, left, right, up, and down are all based on the Figure 1 description drawings of the specification. Taking the perspective of the observer as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left, and so on.

[0074] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as limiting the protection scope of the present invention.

[0075] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of graphite straw composite thermal insulation material, characterized by: The method is composed of the following raw materials in parts by weight: 75-95 parts of graphite corn stalk particles, 50-60 parts of graphite polystyrene particles, 45-53 parts of vitrified microspheres, 20-30 parts of cement, and 15-28 parts of silica fume; The graphite corn stalk particles are prepared from 60%-75% corn stalks, 10%-25% graphite, 8%-15% water-based resin, and 2%-10% additives; Wherein, the additive is a mixture of aluminum hydroxide, a silane coupling agent and zinc borate.

2. A method for preparing a novel graphite straw composite thermal insulation material, the method being used to prepare the novel graphite straw composite thermal insulation material according to claim 1, characterized in that: The following steps are involved: A1: Use a rolling water washing device to wash the corn stalks and dry them until the moisture content is less than 5%; A2: Soak corn stalks in 5%-10% NaOH solution for 2-4 hours to increase fiber activity, then rinse with dilute hydrochloric acid or water until neutral, dry again, and cut into 1-5mm particles; A3: Mix graphite and deionized water at a ratio of 1:10, disperse by ultrasonic for 30 minutes, add 1%-2% of the mass of graphite silane coupling agent, heat and stir for 1 hour to obtain modified graphite; A4: Mix corn stalk particles, modified graphite, water-based resin and additives, and extrude the mixture into particles with a diameter of 3-8 mm through a screw extruder to obtain graphite corn stalk particles; A5: Heat and stir the graphite corn straw particles, graphite polystyrene particles, glass beads, cement and silica fume for 20-30 minutes, then put the mixture into a mold for molding, and cure it at room temperature or by heating for 24-48 hours to obtain the graphite straw composite insulation material.

3. The method for preparing a novel graphite straw composite thermal insulation material according to claim 2, characterized in that: The specific operation steps of the rolling water washing device in step A1 are: A11: placing straw on the surface of the conveying assembly, and driven by the conveying assembly, the straw gradually moves toward the inside of the gantry (2), and the water spraying assembly sprays water on the surface of the straw for cleaning; A12: When the straw passes through the lower side of the lateral rolling assembly, the motor (8) controls the rotation of the turntable (7), and the connecting rod (9) drives the translation seat (4) to reciprocate left and right, so that the translation seat (4) continuously rolls the straw sideways and causes it to roll sideways; A13: The water in the water supply pipe (12) enters the cavity (16) of the translation seat (4) through the bellows (17), and then sprays downward along the plurality of guide holes (18), so that the translation seat (4) rolls the straw while spraying water on it; A14: When the translation seat (4) moves toward the baffle (25), the elastic member (23) is squeezed and the air inside it enters the top of the plurality of pressure cylinders (19), driving the movable block (20) and the piercing rod (22) to move downward. The piercing rod (22) pierces the inside of the straw, causing the straw to break and crack, making it easier for water to enter the inside of the straw to clean impurities.

4. A novel preparation device of graphite straw composite thermal insulation material, which is applicable to the preparation method according to claim 2, characterized in that: The rolling water washing device in step A1 comprises a cleaning pool (1), a gantry (2), a conveying assembly, a water spraying assembly and a lateral rolling assembly; the gantry (2) is arranged above the cleaning pool (1); The conveying assembly is arranged on the top of the cleaning pool (1); the conveying assembly is used to convey the straw to move and pass under the water spraying assembly; the water spraying assembly is arranged on the inner side of the gantry (2); the water spraying assembly is used to spray water to wash the straw on the surface of the conveying assembly; The lateral rolling assembly is arranged inside the gantry (2); the lateral rolling assembly is used to control the lateral rolling of the straw on the surface of the conveying assembly; the lateral rolling assembly includes a group of limit plates (3) fixedly connected to the top of the cleaning tank (1); a translation seat (4) is arranged between the limit plates (3); a slide groove (5) is opened on the surface of the limit plates (3); a slider (6) is fixedly connected to the side of the translation seat (4), and the slider (6) is slidably connected to the inside of the slide groove (5); a turntable (7) is rotatably connected to the inside of the gantry (2), and the turntable (7) is connected to a motor (8); a connecting rod (9) is hinged between the edge of the end face of the turntable (7) and the translation seat (4).

5. The preparation device of a novel graphite straw composite thermal insulation material according to claim 4, characterized in that: The water spraying assembly comprises a group of strip-shaped water spraying parts (10); a group of water spraying holes are evenly distributed on the lower side of the strip-shaped water spraying parts (10); and the strip-shaped water spraying parts (10) are connected to a water supply pipe (12) via a series pipe (11).

6. The preparation device of a novel graphite straw composite thermal insulation material according to claim 4, characterized in that: The conveying assembly comprises a group of conveying rollers (13), and the conveying rollers (13) are connected to a driving mechanism; a conveying belt (14) is sleeved on the surface of the conveying rollers (13); a guide wheel (15) is rotatably connected to the inner side of the cleaning pool (1) at a position corresponding to the translation seat (4); the conveying rollers (13) on both sides of the guide wheel (15) have different heights.

7. The preparation device of a novel graphite straw composite thermal insulation material according to claim 6, characterized in that: The conveyor belt (14) is designed to be mesh-shaped; and there are gaps between adjacent conveyor rollers (13).

8. The preparation device of a novel graphite straw composite thermal insulation material according to claim 6, characterized in that: A cavity (16) is provided inside the translation seat (4); an elastic bellows (17) is connected between the cavity (16) and the water supply pipe (12); and a group of guide holes (18) are evenly distributed between the cavity (16) and the lower side of the translation seat (4).

9. The preparation device of a novel graphite straw composite thermal insulation material according to claim 8, characterized in that: A group of pressure cylinders (19) are evenly distributed inside the cavity (16); a movable block (20) is slidably and sealedly connected inside the pressure cylinder (19); a spring (21) is fixedly connected between the upper side of the movable block (20) and the pressure cylinder (19); a puncture rod (22) is fixedly connected to the lower side of the movable block (20); the tip of the bottom of the puncture rod (22) faces the guide hole (18); An elastic member (23) is fixedly connected to the side of the translation seat (4) away from the connecting rod (9); the elastic member (23) is designed to be a hollow structure, and a conduit (24) is connected between the elastic member (23) and the tops of the plurality of pressure cylinders (19); a baffle (25) is fixedly connected to the top of the cleaning pool (1) at a position corresponding to the elastic member (23).

10. The preparation device of a novel graphite straw composite thermal insulation material according to claim 9, characterized in that: The bottom of the puncture rod (22) and the end of the pressure cylinder (19) are connected in a sliding seal; a water inlet (26) is connected between the bottom of the pressure cylinder (19) and the cavity (16); a drainage hole (27) is provided inside the puncture rod (22), and the top of the drainage hole (27) is connected to the pressure cylinder (19); and one-way valves are provided inside the water inlet (26) and the drainage hole (27).

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