Fabricated fireproof thermal-insulation hydrophobic integrated composite wallboard

Abstract

The invention discloses a fabricated fireproof thermal-insulation hydrophobic integrated composite wallboard, and belongs to the technical field of composite wallboards. The wallboard is prepared from the following raw materials in percentage by weight: 15%-30% of regenerated cellulose fibers, 10%-30% of modified clay, 10%-30% of phosphogypsum, 8%-18% of ordinary Portland cement, 4%-8% of a curing enhancer, 0-2% of an additive and 5%-10% of phase change microcapsules. The preparation method comprises the following steps: firstly, dry-mixing the regenerated cellulose fiber, the modified clay, the phosphogypsum and the cement, then adding an aqueous solution dissolved with the curing enhancer and the additive and the phase change microcapsule, mixing to obtain slurry, and finally carrying out compression molding and natural curing to obtain a finished product. Industrial and agricultural wastes are utilized, through the synergistic effect of the components, the thermal insulation material has excellent thermal insulation property, mechanical strength and stability, and unification of energy conservation, environmental protection and functionality is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of composite wallboards, and particularly relates to an assembled fireproof, heat-insulating and water-repellent integrated composite wallboard. BACKGROUND

[0002] As a core component of building industrialization and green building development, the assembled wallboard refers to a wall material that is produced by standardization prefabrication in a factory and assembled and installed on site. The assembled wallboard has the advantages of high construction efficiency, controllable quality and precision, low resource energy consumption, and small on-site pollution, and has become a key carrier for modular construction in the fields of residential buildings, public buildings and the like, and meets the current low-carbon and intensive development trend of the building industry.

[0003] However, the existing assembled wallboard still has many technical shortcomings in the aspects of functional integration design and performance synergistic optimization, and is difficult to meet the increasingly stringent requirements of building energy saving, safety protection and long-term use, and the specific defects are as follows:

[0004] Limited thermal insulation performance and lack of active temperature regulation: The thermal insulation scheme of the existing assembled wallboard mostly relies on single lightweight aggregate (such as ceramsite, expanded perlite) or traditional organic thermal insulation interlayer (such as polystyrene, polyurethane). The former is a passive heat insulation structure, and the thermal conductivity is generally higher than 0.1 W / (m·K), the thermal insulation efficiency is limited, and it is difficult to meet the requirements of high-efficiency thermal insulation materials in the current building energy saving standard. The latter has a low thermal conductivity, but has the risks of flammability (the oxygen index is generally lower than 28%), release of toxic gases at high temperatures, and shrinkage and aging during long-term use. In addition, the interface compatibility with inorganic matrix (cement, gypsum) is poor, and delamination and hollowing are easy to occur, which seriously affects the integrity and safety of the wall. More importantly, such thermal insulation design lacks an active temperature regulation mechanism, and cannot respond to day-night temperature difference or extreme temperature fluctuations through energy storage and release, resulting in poor stability of the indoor thermal environment of the building and additional air conditioning energy consumption.

[0005] Fireproof and water-repellent functions are split, and durability is insufficient: Most assembled wallboards focus on structural strength or single thermal insulation function, and ignore the integrated design of fireproof and water-repellent functions. The wallboard made of traditional inorganic matrix (ordinary concrete, unmodified gypsum) depends only on the inorganic properties of the material itself for fireproof performance, without targeted optimization of flame-retardant components, and the oxygen index is generally lower than 32%, which is difficult to meet the difficult level (B1 level) in GB8624-2012 “Classification of Combustion Performance of Building Materials and Products”. At the same time, the surface has strong hydrophilicity, and the water absorption rate is often more than 10%, which is easy to cause moisture return, mold growth and freeze-thaw damage in a humid environment for a long time, resulting in mechanical strength attenuation and shortening of service life. Although some improved wallboards add organic water-repellent agents or flame retardants, there are problems such as poor compatibility of additives with the matrix and rapid functional attenuation, and the long-term stable synergy of fireproof and water-repellent performance cannot be achieved.

[0006] Balancing the contradiction between the use of environmentally friendly raw materials and multiple performance: In order to implement the concept of green and low carbon, some assembled wall panels try to use agricultural waste (straw, wheat straw, sugarcane residue, etc.) or industrial by-products (phosphogypsum, fly ash, etc.) as raw materials, but face three core bottlenecks: first, the interfacial bonding force between plant fibers and inorganic cementitious materials is weak, which is easy to form cracks in the matrix, resulting in insufficient compressive strength and poor bending performance of the wall panel, which is difficult to meet the structural bearing requirements of the assembled component; second, the industrial by-products have complex composition, and if they are not modified, harmful impurities or interference with the cement hydration reaction will be introduced, causing fluctuations in product performance; third, the functional design is single, and most products only focus on environmental protection, but sacrifice key performance such as thermal insulation, fire resistance and water resistance, and cannot achieve the multi-dimensional coordinated balance of environmental protection, thermal insulation, fire resistance and water resistance.

[0007] In summary, the technical defects of the existing assembled wall panel in active temperature regulation and insulation, fire and water resistance integration, efficient use of environmentally friendly raw materials, and multi-performance coordination have become a key obstacle to its popularization and application in high-end building field. Therefore, the development of an assembled integrated composite wall panel with active temperature regulation and insulation, efficient fire resistance and durable water resistance functions, and the realization of the resource utilization of agricultural and industrial waste, has become an urgent direction to solve the current technical problems and meet the high-quality development needs of the building industry. SUMMARY

[0008] In view of the above, in order to overcome the defects of the prior art, the present application takes regenerated cellulose fiber and industrial by-product phosphogypsum as the core raw material, which not only effectively utilizes agricultural waste and industrial waste, reduces the production cost of the wall panel, but also conforms to the green and sustainable development concept of building, and reduces the environmental burden by recycling waste.

[0009] In order to achieve the above purpose, the following technical scheme is adopted: the present application provides an assembled fire-resistant, thermal-insulating and water-resistant integrated composite wall panel, which is made of the following raw materials in weight percentage:

[0010] 15% to 30% of regenerated cellulose fiber,

[0011] 10% to 30% of modified clay,

[0012] 10% to 30% of phosphogypsum,

[0013] 8% to 18% of ordinary portland cement,

[0014] 4% to 8% of solidification enhancer,

[0015] 0 to 2% of additive,

[0016] 5% to 10% of phase change microcapsule;

[0017] The preparation method of the modified clay is: mixing the clay with moderate plasticity and silane coupling agent KH-550 at a mass ratio of 100:1-100:3, adding an ethanol aqueous solution with a volume concentration of 50%-70%, stirring at 60-80°C for 2-4h, and then filtering, washing and drying to obtain the modified clay.

[0018] The preparation method of the phase change microcapsule is:

[0019] (1) mixing n-eicosane and graphene nanosheet at a mass ratio of 100:5-100:10, ultrasonic dispersion at 70-80°C for 30-60min to obtain a core material mixture;

[0020] (2) adding the core material mixture of step (1) into a silica sol with a mass percentage concentration of 10%-20%, the mass ratio of the core material mixture to the silica sol being 1:2-1:4, then adding hexadecyl trimethyl ammonium bromide as an emulsifier, which accounts for 0.5%-1% of the mass of the silica sol, high-speed shearing emulsification at 50-60°C for 20-40min to form an emulsion;

[0021] (3) slowly adding tetraethyl orthosilicate which accounts for 5%-10% of the mass of the silica sol into the emulsion of step (2), and adding ammonia water as a catalyst, which accounts for 10%-20% of the mass of the tetraethyl orthosilicate, stirring and reacting at 40-50°C for 2-4h, after the reaction is completed, cooling, filtering, washing and drying to obtain phase change microcapsules with silica as a shell layer and graphene modified n-eicosane as a core material.

[0022] Further, the regenerated cellulose fiber is a regenerated fiber from agricultural waste, including at least one of rice straw, wheat straw or sugarcane residue.

[0023] Further, the strength grade of the ordinary portland cement is 42.5 or 52.5.

[0024] Further, the width of the regenerated cellulose fiber is 1-2mm, and the thickness is 0.5-1mm.

[0025] Further, the additive is one or more of CaCl2 or MgCl2.

[0026] Further, the curing enhancer is composed of the following components by weight percentage: CaO 20%-40%, calcium stearate 20%-40%, MgSO4 10%-30%, MgO 10%-30%, and acrylic resin 10%-30%.

[0027] Further, the assembled fireproof, thermal insulation and water drainage integrated composite wallboard is prepared by the following steps:

[0028] (a) proportionally weigh each raw material, first mix the recycled cellulose fiber, modified clay, phosphogypsum and ordinary Portland cement uniformly to obtain a mixture A;

[0029] (b) dissolve the solidification enhancer and additives in water to form a solution B;

[0030] (c) add the solution B and phase change microcapsules to the mixture A, and stir to mix uniformly to obtain a slurry;

[0031] (d) pour the slurry into a wallboard mold, compact and form, demold and naturally cure for 7-14 days to obtain the prefabricated fireproof, thermal insulation and hydrophobic integrated composite wallboard.

[0032] Further, the compacting and forming in step (d) is compacted and formed by a press at 10-20 MPa.

[0033] Further, the natural curing condition in step (d) is temperature 15-30 DEG C, relative humidity 60%-80%.

[0034] The beneficial effects of the present application are:

[0035] The present application takes recycled cellulose fiber and industrial byproduct phosphogypsum as core raw materials, not only effectively utilizes agricultural waste and industrial waste, reduces the production cost of wallboard, but also is more in line with the green and sustainable building concept, through the resource utilization of waste, reduces the environmental burden.

[0036] The recycled cellulose fiber forms a porous network structure in the matrix, effectively retarding heat conduction, secondly, the unique phase change microcapsule takes graphene modified n-eicosane as core material and silicon dioxide as shell layer, which undergoes reversible solid-liquid phase change at ambient temperature change, actively adjusts the temperature by absorbing or releasing a large amount of latent heat, significantly improves the thermal inertia of the wallboard, makes the internal temperature of the building more stable, the addition of graphene enhances the thermal conductivity of the core material, ensures the rapid and uniform phase change process.

[0037] Through the surface modification of clay by silane coupling agent, the interfacial bonding force of clay and cement matrix and other components is significantly improved, the internal defects are reduced, thereby the compressive and flexural strength of the wallboard is improved, at the same time, the components in the solidification enhancer synergistically act, CaO and MgO provide alkaline environment to promote hydration, calcium stearate endows the wallboard with hydrophobicity, and acrylic resin enhances the bonding force, which collectively improves the overall strength, water resistance and durability of the wallboard.

[0038] The application forms a stable overall structure through physical and chemical actions among the components, the modified clay is combined closely with the matrix, the silica shell of the phase change microcapsule has good compatibility with the cement hydration product, and the performance attenuation caused by poor combination of the capsule and the matrix is avoided, and the optimized interface structure ensures the dimensional stability and functional durability of the wallboard during long-term use. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the application, and not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to one skilled in the art. In addition, any method and material similar or equivalent to those described can be used in the application. The preferred implementation methods and materials described herein are only used for demonstration, but cannot limit the content of the application.

[0041] The experimental methods in the following embodiments are all conventional methods unless otherwise specified. The test materials used in the following embodiments are all purchased from commercial channels unless otherwise specified.

[0042] Embodiment 1

[0043] An assembled fireproof, heat-insulating and water-draining integrated composite wallboard is made of the following raw materials in percentage by weight:

[0044] 20% of regenerated cellulose fiber,

[0045] 21% of modified clay,

[0046] 21% of phosphogypsum,

[0047] 18% of ordinary portland cement,

[0048] 8% of solidification enhancer,

[0049] 2% of additive,

[0050] 10% of phase change microcapsule;

[0051] The preparation method of the modified clay is as follows: a clay with medium plasticity and silane coupling agent KH-550 are mixed at a mass ratio of 100:1, and then added into an ethanol aqueous solution with a volume concentration of 50%, stirred at 60℃ for 2h, and then filtered, washed and dried to obtain the modified clay.

[0052] The preparation method of the phase change microcapsule is as follows:

[0053] (1) Mix n-eicosane with graphene nanosheet at a mass ratio of 100:5, ultrasonically disperse at 70℃ for 30 minutes to obtain a core material mixture;

[0054] (2) Add the core material mixture of step (1) to a 10% mass percentage concentration of silica sol, the mass ratio of the core material mixture to the silica sol is 1:2, then add 0.5% of cetyltrimethylammonium bromide based on the mass of the silica sol as an emulsifier, high-speed shear emulsify at 50℃ for 20 minutes to form an emulsion;

[0055] (3) Slowly add 5% of tetraethyl orthosilicate based on the mass of the silica sol to the emulsion of step (2), while adding 10% of ammonia water based on the mass of the tetraethyl orthosilicate as a catalyst, stir and react at 40℃ for 2h, after the reaction is completed, cool, filter, wash, and dry to obtain phase change microcapsules with silica as the shell layer and graphene modified n-eicosane as the core material.

[0056] The regenerated cellulose fiber is regenerated fiber from agricultural waste, which is composed of rice straw and wheat straw at a mass ratio of 2:1.

[0057] The strength grade of the ordinary portland cement is 42.5.

[0058] The width of the regenerated cellulose fiber is 1mm, and the thickness is 0.5mm.

[0059] The additive is CaCl2.

[0060] The solidification enhancer is composed of the following components by weight percentage: CaO 20%, calcium stearate 20%, MgSO4 10%, MgO 30%, and acrylic resin 20%.

[0061] A preparation method of a fabricated fireproof, thermal insulation, and water drainage integrated composite wallboard, comprising the following steps:

[0062] (a) Weigh the raw materials according to the proportion, first mix the regenerated cellulose fiber, modified clay, phosphogypsum, and ordinary portland cement uniformly to obtain a mixture A;

[0063] (b) Dissolve the solidification enhancer and the additive in water to form a solution B;

[0064] (c) Add the solution B and the phase change microcapsules to the mixture A and stir to mix uniformly to obtain a slurry;

[0065] (d) Pour the slurry into a wallboard mold, compact and form, demold, and naturally cure for 7 days to obtain the fabricated fireproof, thermal insulation, and water drainage integrated composite wallboard.

[0066] The compaction forming in step (d) is press forming at 10 MPa using a press.

[0067] The natural curing condition in step (d) is a temperature of 15℃ and a relative humidity of 60%.

[0068] Example 2:

[0069] A prefabricated fireproof, thermal insulation, and water drainage integrated composite wallboard is made from the following raw materials in percentage by weight:

[0070] 30% of regenerated cellulose fibers,

[0071] 30% of modified clay,

[0072] 23% of phosphogypsum,

[0073] 8% of ordinary Portland cement,

[0074] 4% of solidification enhancer,

[0075] 5% of phase change microcapsules;

[0076] The preparation method of the modified clay is as follows: a medium plasticity clay is mixed with silane coupling agent KH-550 at a mass ratio of 100:3, added into an ethanol aqueous solution with a volume concentration of 70%, stirred at 80℃ for 4h, and then filtered, washed, and dried to obtain the modified clay.

[0077] The preparation method of the phase change microcapsules is as follows:

[0078] (1) eicosane and graphene nanosheets are mixed at a mass ratio of 100:10, ultrasonically dispersed at 80℃ for 60 minutes to obtain a core material mixture;

[0079] (2) the core material mixture of step (1) is added into a silicon sol with a mass percentage concentration of 20%, and the mass ratio of the core material mixture to the silicon sol is 1:4, then 1% of cetyltrimethylammonium bromide based on the mass of the silicon sol is added as an emulsifier, and the emulsion is formed by high-speed shearing emulsification at 60℃ for 40 minutes;

[0080] (3) 10% of tetraethyl orthosilicate based on the mass of the silicon sol is slowly added dropwise into the emulsion of step (2), and 20% of ammonia water based on the mass of the tetraethyl orthosilicate is added dropwise as a catalyst, and the reaction is stirred at 50℃ for 4h, after the reaction is completed, the mixture is cooled, filtered, washed, and dried to obtain phase change microcapsules with silica as the shell layer and graphene modified eicosane as the core material.

[0081] The regenerated cellulose fibers are regenerated fibers from agricultural waste, composed of rice straw, wheat straw, and sugarcane residue at a mass ratio of 2:2:1.

[0082] The strength grade of the ordinary portland cement is 52.5.

[0083] The width of the recycled cellulose fiber is 2mm, and the thickness is 1mm.

[0084] The additive is MgCl2.

[0085] The solidification enhancer is composed of the following weight percentages of components: CaO 30%, calcium stearate 10%, MgSO4 10%, MgO 20%, and acrylic resin 30%.

[0086] A preparation method of an assembled fireproof thermal insulation and drainage integrated composite wallboard, comprising the following steps:

[0087] (a) weighing each raw material according to the proportion, first mixing the recycled cellulose fiber, modified clay, phosphogypsum and ordinary portland cement uniformly to obtain a mixture A;

[0088] (b) dissolving the solidification enhancer and the additive in water to form a solution B;

[0089] (c) adding the solution B and the phase change microcapsule to the mixture A and stirring to mix uniformly to obtain a slurry;

[0090] (d) pouring the slurry into a wallboard mold, compacting and forming, demolding and naturally curing for 14 days to obtain the assembled fireproof thermal insulation and drainage integrated composite wallboard.

[0091] The compacting and forming in step (d) is compacted and formed by a press at 20MPa.

[0092] The natural curing condition in step (d) is a temperature of 30℃ and a relative humidity of 80%.

[0093] Example 3:

[0094] An assembled fireproof thermal insulation and drainage integrated composite wallboard is made of the following weight percentages of raw materials:

[0095] recycled cellulose fiber 26%,

[0096] modified clay 23%,

[0097] phosphogypsum 23%,

[0098] ordinary portland cement 13%,

[0099] solidification enhancer 6%,

[0100] additive 1%,

[0101] phase change microcapsule 8%;

[0102] The preparation method of the modified clay is: mixing the medium plastic clay and silane coupling agent KH-550 at a mass ratio of 100:2, adding an ethanol aqueous solution with a volume concentration of 60%, stirring at 70°C for 3h, and then filtering, washing and drying to obtain the modified clay;

[0103] The preparation method of the phase change microcapsule is:

[0104] (1) mixing n-eicosane and graphene nanosheet at a mass ratio of 100:7, ultrasonic dispersion at 75°C for 45 minutes to obtain a core material mixture;

[0105] (2) adding the core material mixture of step (1) into a silicon sol with a mass percentage concentration of 15%, and then adding hexadecyl trimethyl ammonium bromide as an emulsifier accounting for 0.8% of the mass of the silicon sol, high-speed shearing emulsification at 55°C for 30 minutes to form an emulsion;

[0106] (3) slowly adding tetraethyl orthosilicate accounting for 7.5% of the mass of the silicon sol into the emulsion of step (2), and adding ammonia water as a catalyst accounting for 15% of the mass of the tetraethyl orthosilicate, stirring and reacting at 45°C for 3h, and then cooling, filtering, washing and drying to obtain phase change microcapsules with silica as a shell layer and graphene modified n-eicosane as a core material.

[0107] The regenerated cellulose fiber is regenerated fiber from agricultural waste, which is composed of rice straw, wheat straw and sugarcane residue at a mass ratio of 2:2:1.

[0108] The strength grade of the ordinary portland cement is 42.5.

[0109] The width of the regenerated cellulose fiber is 1.5mm, and the thickness is 0.8mm.

[0110] The additive is composed of CaCl2 and MgCl2 at a mass ratio of 2:1.

[0111] The curing enhancer is composed of the following components by weight percentage: CaO 10%, calcium stearate 40%, MgSO4 20%, MgO 20%, and acrylic resin 10%.

[0112] A preparation method of an assembled fireproof, heat-insulating and water-draining integrated composite wallboard, comprising the following steps:

[0113] (a) weighing each raw material according to the proportion, and uniformly mixing the regenerated cellulose fiber, the modified clay, the phosphogypsum and the ordinary portland cement to obtain a mixture A;

[0114] (b) dissolving the curing enhancer and the additive in water to form a solution B;

[0115] (c) adding solution B and phase change microcapsules into mixture A, stirring to mix evenly to obtain a slurry;

[0116] (d) pouring the slurry into a wallboard mold, compacting and forming, demolding and naturally curing for 10 days to obtain the prefabricated fireproof, thermal insulation and water repellent integrated composite wallboard.

[0117] The compacting and forming in step (d) is compacting and forming by a press at 15 MPa.

[0118] The natural curing condition in step (d) is a temperature of 23℃ and a relative humidity of 70%.

[0119] Comparative Example 1:

[0120] This comparative example is compared with Example 3, and the phase change microcapsules are omitted, and the weight percentage of the phase change microcapsules is replaced with an equal amount of modified clay. The other raw material compositions and preparation methods are exactly the same as those of Example 3.

[0121] Comparative Example 2:

[0122] This comparative example is compared with Example 3, and unmodified medium plastic clay is used instead of modified clay. The other raw material compositions and preparation methods are exactly the same as those of Example 3.

[0123] Comparative Example 3:

[0124] This comparative example is compared with Example 3, and the regenerated cellulose fiber is omitted, and the weight percentage of the regenerated cellulose fiber is replaced with an equal amount of ordinary portland cement. The other raw material compositions and preparation methods are exactly the same as those of Example 3.

[0125] Comparative Example 4:

[0126] This comparative example represents a traditional wallboard, using an ordinary concrete formula: ordinary portland cement 40%, quartz sand 40%, crushed stone aggregate 20%, and a small amount of water is added and compacted and formed after mixing. The preparation method is similar to that of Example 3, but there is no regenerated cellulose fiber, modified clay, phosphogypsum, curing enhancer, additive and phase change microcapsule.

[0127] Result analysis

[0128] The thermal conductivity test is carried out by a thermal conductivity analyzer, and the specific steps are as follows: the wallboard sample is placed on the test table, the probe is placed at the center of the sample, the test temperature is set to 25℃, a constant heat flow is applied, and the thermal conductivity value of the sample is recorded. Each sample is tested 3 times and the average value is taken.

[0129] The compressive strength test is carried out by a universal testing machine, and the bending strength test is carried out by an electronic bending testing machine.

[0130] The water absorption rate test was performed by oven and electronic balance. The wallboard sample was dried at 105℃ until the weight was constant, and then the dry weight was recorded. After the sample was immersed in water for 24h, the surface water was wiped off, and the wet weight was measured. The water absorption rate was calculated.

[0131] The thermal stability test was performed by thermogravimetric analyzer. About 10 mg of wallboard sample powder was heated from room temperature to 800℃ at a rate of 10℃ / min under nitrogen atmosphere. The mass loss curve was recorded, and the mass loss rate was calculated.

[0132] The limiting oxygen index (LOI) was determined according to GB / T 2406.2-2009. Each wallboard sample was tested for 3 times, and the average value was taken.

[0133] The static contact angle of water droplet on the wallboard sample was recorded by contact angle measuring instrument according to GB / T 30693-2014.

[0134] The test results are shown in Table 1.

[0135] Table 1 Comparison of performance test results of composite wallboard

[0136] Sample No. Thermal conductivity [W / (m·K)] Compressive strength / MPa Bending strength / MPa Water absorption / % Mass loss rate / % LOI / % Contact angle / ° Example 1 0.085 8.5 3.2 8.5 <5% 34.2 102.5 Example 2 0.082 8.2 3.0 9.0 <5% 33.8 100.3 Example 3 0.084 8.7 3.3 8.7 <5% 34.5 103.1 Comparative Example 1 0.112 7.0 2.5 12.0 8% 28.5 82.4 Comparative Example 2 0.105 6.5 2.2 11.5 7% 29.2 78.6 Comparative Example 3 0.125 7.8 2.8 10.8 9% 27.8 80.1 Comparative Example 4 0.150 10.0 2.0 15.0 12% 26.3 65.8

[0137] The test results in Table 1 show that the thermal conductivity of the three examples is significantly lower than that of all the comparative examples, indicating that the wallboard of the present application has the most excellent thermal insulation performance. Each example achieves a good balance between compressive and bending strength, and the comprehensive mechanical properties are better than those of the comparative examples. The water absorption rate of the examples is significantly lower, indicating that they have better water resistance and durability. This is mainly due to the improvement of the microstructure of the material by the curing enhancer and modified clay. The mass loss rate of each example at 300℃ is <5%, the oxygen index of the examples is all ≥33.8%, belonging to difficult-to-burn materials, which is significantly higher than that of the comparative examples, showing excellent thermal stability and potential fireproof performance. The hydrophobic contact angle of each example is ≥100°, which has good hydrophobicity.

[0138] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

[0139] The above describes the present application and its embodiments, which is not restrictive, and the examples shown in the embodiments are only one of the embodiments of the present application, and the actual application is not limited thereto. In summary, if a person skilled in the art is inspired, without departing from the purpose of the present application, without creative design, similar ways and examples of the technical solution should belong to the protection scope of the present application.

Claims

1. A prefabricated fireproof, heat-insulating, and water-draining integrated composite wall panel, characterized in that, Made from the following raw materials by weight percentage: Regenerated cellulose fiber 15%–30%, Modified clay 10%–30%, 10%–30% phosphogypsum Ordinary Portland cement 8%–18%, Curing enhancer 4%–8%, Additives 0-2%, Phase change microcapsules 5%–10%; The modified clay is prepared by mixing moderately plastic clay with silane coupling agent KH-550 at a mass ratio of 100:1 to 100:3, adding it to an ethanol aqueous solution with a volume concentration of 50% to 70%, stirring at 60℃ to 80℃ for 2 to 4 hours, and then filtering, washing, and drying to obtain the modified clay. The preparation method of the phase change microcapsules is as follows: (1) Mix n-eicosane and graphene nanosheets at a mass ratio of 100:5 to 100:10 and ultrasonically disperse them at 70℃ to 80℃ for 30 to 60 minutes to obtain a core material mixture; (2) Add the core material mixture from step (1) to a silica sol with a mass percentage concentration of 10% to 20%, the mass ratio of the core material mixture to the silica sol is 1:2 to 1:4, and then add hexadecyltrimethylammonium bromide at a mass of 0.5% to 1% of the silica sol as an emulsifier, and emulsify at high speed at 50°C to 60°C for 20 to 40 minutes to form an emulsion; (3) Slowly add 5% to 10% of the mass of silica sol to the emulsion in step (2), and simultaneously add 10% to 20% of the mass of tetraethyl orthosilicate as a catalyst. Stir the reaction at 40°C to 50°C for 2 to 4 hours. After the reaction is completed, cool, filter, wash and dry to obtain phase change microcapsules with silica as the shell and graphene-modified n-eicosane as the core material.

2. The prefabricated fireproof, heat-insulating, and water-draining integrated composite wall panel according to claim 1, characterized in that: The regenerated cellulose fiber is a regenerated fiber derived from agricultural waste, including at least one of rice straw, wheat straw, or sugarcane bagasse.

3. The prefabricated fireproof, heat-insulating, and water-draining integrated composite wall panel according to claim 2, characterized in that: The strength grade of the ordinary silicate cement is 42.5 or 52.

5.

4. The prefabricated fireproof, heat-insulating, and water-draining integrated composite wall panel according to claim 3, characterized in that: The regenerated cellulose fiber has a width of 1-2 mm and a thickness of 0.5 mm-1 mm.

5. The prefabricated fireproof, heat-insulating, and water-draining integrated composite wall panel according to claim 4, characterized in that: The additive is one or more of CaCl2 or MgCl2.

6. The prefabricated fireproof, heat-insulating, and water-draining integrated composite wall panel according to claim 5, characterized in that: The curing and reinforcing agent is composed of the following components by weight percentage: CaO 20%–40%, calcium stearate 20%–40%, MgSO4 10%–30%, MgO 10%–30%, and acrylic resin 10%–30%.

7. The prefabricated fireproof, heat-insulating, and water-draining integrated composite wall panel according to claim 6, characterized in that: Prepared by the following steps: (a) Weigh each raw material according to the proportion, and first dry mix the regenerated cellulose fiber, modified clay, phosphogypsum and ordinary silicate cement evenly to obtain mixture A; (b) Dissolve the curing enhancer and additives in water to form solution B; (c) Add solution B and phase change microcapsules to mixture A and stir to mix evenly to obtain a slurry; (d) Pour the slurry into the wall panel mold, compact it, and allow it to cure naturally for 7-14 days after demolding to obtain the assembled fireproof, heat-insulating and water-repellent integrated composite wall panel.

8. The prefabricated fireproof, heat-insulating, and water-draining integrated composite wall panel according to claim 7, characterized in that: The compaction molding in step (d) is performed by pressing with a press at 10-20 MPa.

9. The prefabricated fireproof, heat-insulating, and water-draining integrated composite wall panel according to claim 8, characterized in that: The natural curing conditions in step (d) are a temperature of 15-30℃ and a relative humidity of 60%-80%.