Energy-saving light porous thermal insulation partition board and preparation method thereof

Abstract

The invention relates to the technical field of building materials, and particularly discloses an energy-saving light porous thermal insulation partition board and a preparation method thereof. The preparation method comprises the following steps: firstly, synergistically modifying fly ash through zinc stearate, a silane coupling agent and potassium carbonate, then performing mineralization cross-linking modification on polypropylene fibers through silica sol and calcium chloride, then mixing cement, the modified fly ash, glass beads, magnesium chloride and other raw materials, adding a water reducing agent, the mineralization cross-linking modified polypropylene fibers and a foaming agent to prepare lightweight slurry, and finally, preparing the lightweight slurry. And performing extrusion forming, cutting and natural curing to obtain a finished product. Through a dual modification technology and formula optimization, the partition board has excellent lightweight characteristic, heat insulation performance and mechanical strength, and is low in water absorption, stable in size and good in crack resistance; and meanwhile, industrial solid waste fly ash is utilized, so that the production process is environment-friendly and energy-saving, is suitable for large-scale production, and meets the use requirements of energy conservation, greenness and safety of modern buildings.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to an energy-saving lightweight porous thermal insulation partition board and its preparation method. Background Technology

[0002] As the construction industry shifts towards energy conservation and green building practices, lightweight porous thermal insulation partition boards have become a core product replacing traditional wall materials due to their ability to effectively reduce building weight and energy consumption. They are widely used in the enclosure and partition structures of various buildings, including residential and commercial buildings. Currently, lightweight partition boards on the market mainly include inorganic insulation types and organic-inorganic composite insulation types. However, in practical applications, they still face the problem of insufficient performance synergy optimization, making it difficult to simultaneously meet the comprehensive requirements of lightweight, high strength, thermal insulation, and durability.

[0003] Existing inorganic thermal insulation partition boards made from industrial solid wastes such as fly ash have achieved the resource utilization of solid waste. However, the fly ash surface is highly hydrophilic and has low activity without targeted modification, resulting in weak interfacial bonding with the cementitious matrix. This leads to defects such as high water absorption and large drying shrinkage value of the boards. Long-term use can easily cause cracking and dampness. At the same time, it is difficult to balance thermal insulation performance and mechanical strength. Either strength is sacrificed in pursuit of lightweight, or the thermal insulation effect is reduced due to increased density.

[0004] In fiber-reinforced composite partition boards, ordinary polypropylene fibers, glass fibers, and other materials exhibit poor compatibility with inorganic cementitious materials, resulting in weak interfacial bonding. Under stress, these fibers easily slip from the matrix, failing to effectively enhance toughness and crack resistance, leading to insufficient impact resistance and poor toughness. Furthermore, existing foaming systems often suffer from uneven pore distribution and low closed-cell rates. Some foaming agents also exhibit poor compatibility with the cementitious system, easily causing pore connectivity and reducing thermal insulation performance. Therefore, there is an urgent need to develop an energy-saving, lightweight, porous thermal insulation partition board and its preparation method. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a method for preparing an energy-saving, lightweight, porous thermal insulation partition wall panel.

[0006] In a first aspect, the present invention provides a method for preparing an energy-saving lightweight porous thermal insulation partition wall panel, comprising the following steps: Step S1: Add zinc stearate and silane coupling agent to water, heat and stir to form zinc stearate emulsion, add fly ash to zinc stearate emulsion, heat and stir to react, add potassium carbonate, continue the reaction, after the reaction is completed, filter, wash, dry, grind, calcine and sieve to obtain modified fly ash; Step S2: Add polypropylene fiber to water and disperse it by ultrasonication to obtain a polypropylene fiber suspension. Add silica sol and calcium chloride to the polypropylene fiber suspension, stir evenly, adjust the pH value of the system, age, filter, wash and dry to obtain mineralized crosslinked modified polypropylene fiber. Step S3: Add cement, modified fly ash, and vitrified microspheres to water, stir evenly, then add water-reducing agent and mineralized cross-linked modified polypropylene fiber, stir evenly, add foaming agent, stir, and obtain lightweight slurry. Step S4: Add the lightweight slurry to the wall panel extrusion molding machine, extrude and cut it, and allow it to cure naturally to obtain the energy-saving lightweight porous thermal insulation partition board.

[0007] Further, the weight parts of each raw material in step S1 are: 1-5 parts zinc stearate, 0.5-3 parts silane coupling agent, 30-80 parts water, 60-120 parts fly ash, and 2-8 parts potassium carbonate.

[0008] Furthermore, the silane coupling agent is KH-550.

[0009] Furthermore, in step S1, the heating and stirring temperature for forming the zinc stearate emulsion is 40℃-60℃, and the stirring time is 10min-30min.

[0010] Further, after adding fly ash, the temperature is raised to 70℃-90℃ and the mixture is stirred for 20min-60min.

[0011] Furthermore, after adding potassium carbonate, the reaction was continued at 70℃-90℃ for 30min-90min.

[0012] Furthermore, the calcination is carried out in a muffle furnace at a temperature of 500℃-700℃ for 1-3 hours.

[0013] Furthermore, the sieving is performed through a 200-400 mesh sieve.

[0014] Further, the weight parts of each raw material in step S2 are: 5-20 parts of polypropylene fiber, 100-300 parts of water, 10-30 parts of silica sol, and 2-10 parts of calcium chloride.

[0015] Furthermore, the ultrasonic dispersion power is 200W-400W, and the dispersion time is 15min-30min.

[0016] Furthermore, the pH of the system is adjusted to 8-10 using ammonia or sodium hydroxide aqueous solution.

[0017] Furthermore, the aging process is carried out in a constant temperature water bath at a temperature of 50℃-70℃ for 2-4 hours.

[0018] Furthermore, the drying is carried out in a forced-air drying oven at a temperature of 80℃-100℃ for 2-4 hours.

[0019] Further, the weight parts of each raw material in step S3 are as follows: 100-200 parts cement, 20-60 parts modified fly ash, 10-40 parts vitrified microspheres, 40-100 parts water, 0.5-3 parts water-reducing agent, 3-12 parts mineralized cross-linked modified polypropylene fiber, and 0.5-3 parts foaming agent.

[0020] Furthermore, the foaming agent is aluminum powder paste.

[0021] Furthermore, the stirring time after adding the foaming agent is 30s-90s, and the stirring speed is controlled at 200r / min-400r / min.

[0022] Furthermore, in step S4, the extrusion molding pressure of the wall panel extrusion molding machine is 0.5MPa-2MPa.

[0023] Furthermore, the natural curing temperature is 15℃-30℃, the relative humidity is 60%-80%, and the curing time is 7d-28d.

[0024] On the other hand, the present invention provides an energy-saving lightweight porous thermal insulation partition board prepared by a method for preparing an energy-saving lightweight porous thermal insulation partition board.

[0025] The beneficial effects of this invention are: 1. This invention effectively constructs an internal multi-scale porous structure by performing composite hydrophobic and activation modification on fly ash, and by combining chemical foaming technology with the introduction of lightweight vitrified microspheres. This structure significantly reduces the weight of the board while effectively blocking heat transfer, enabling the product to simultaneously achieve excellent lightweight properties and high-efficiency thermal insulation performance, meeting the core requirements of modern energy-saving buildings for building envelope materials.

[0026] 2. This invention innovatively modifies the surface of polypropylene fibers through mineralization and cross-linking, enabling them to form a strong chemical and mechanical bond with the cement matrix. This strong interfacial adhesion allows the polypropylene fibers to effectively bridge and inhibit the propagation of microcracks, thereby significantly improving the toughness, impact resistance, and crack resistance under load of the partition wall panel, enhancing the product's safety and durability.

[0027] 3. The hydrophobic modification treatment of fly ash in this invention significantly reduces its hydrophilicity, resulting in a final product with lower water absorption and drying shrinkage, thereby improving the dimensional stability and long-term reliability of the partition wallboard in humid environments. Furthermore, this method utilizes a large amount of industrial solid waste fly ash as its core raw material, and the production process does not require high temperature or high pressure, embodying the green concept of comprehensive resource utilization and energy conservation and environmental protection. Detailed Implementation

[0028] To make the embodiments of the present invention easier to understand, the present invention will be described in detail below with reference to specific embodiments. These embodiments are for illustrative purposes only and are not limited to the application scope of the present invention.

[0029] The specific sources of the raw materials used in this invention are as follows: The cement used in this invention is grade 52.5 low-alkali cement, purchased from Chongqing Xinjianan Building Materials Co., Ltd.

[0030] The polypropylene fibers used in this invention have a diameter of 15μm-48μm, are monofilaments, and were purchased from Taian Haosong Fiber Co., Ltd.

[0031] The silica sol used in this invention is a liquid silica sol, purchased from Jinan Huamao Chemical Co., Ltd.

[0032] The vitrified microspheres used in this invention have a particle size of 80 mesh and were purchased from Langfang Sanxin Perlite Products Co., Ltd.

[0033] The aluminum powder paste used in this invention was purchased from Shandong Yingfeiyang New Material Technology Co., Ltd.

[0034] The water-reducing agent used in this invention is a polycarboxylate water-reducing agent, purchased from Liaoning Hengda New Materials Co., Ltd.

[0035] The fly ash used in this invention is Grade I fly ash with a specification of 200 mesh, purchased from Lingshou County Chengjiang Mining Processing Plant.

[0036] Example 1 A method for preparing an energy-saving lightweight porous thermal insulation partition board includes the following preparation steps: Step S1: Take 1 part zinc stearate, 0.5 parts silane coupling agent KH-550, 30 parts water, 60 parts grade I fly ash, and 2 parts potassium carbonate; add zinc stearate and silane coupling agent KH-550 to water, heat and stir at 40℃ for 10 min to form zinc stearate emulsion; add grade I fly ash to zinc stearate emulsion, heat to 70℃ and stir to react for 20 min; add potassium carbonate and continue to react at 70℃ for 30 min; after the reaction is completed, filter, wash twice with deionized water, transfer to a forced-air drying oven, dry at 80℃ for 2 h, grind after drying, calcine in a muffle furnace at 500℃ for 1 h, and pass through a 200 mesh sieve to obtain modified fly ash; Step S2: Take 5 parts of polypropylene fiber, 100 parts of water, 10 parts of liquid silica sol, and 2 parts of calcium chloride; add the polypropylene fiber to the water and ultrasonically disperse it for 15 minutes at 200W power to obtain a polypropylene fiber suspension; add the liquid silica sol to the polypropylene fiber suspension, and then add calcium chloride and stir evenly; adjust the pH of the system to 8 with 0.5% ammonia water and age it in a constant temperature water bath at 50℃ for 2 hours; after filtration, wash it once with deionized water and dry it in a forced-air drying oven at 80℃ for 2 hours to obtain mineralized crosslinked modified polypropylene fiber; Step S3: Take 100 parts of 52.5 grade low-alkali cement, 20 parts of modified fly ash, 10 parts of vitrified microspheres, 40 parts of water, 0.5 parts of polycarboxylate superplasticizer, 3 parts of mineralized cross-linked modified polypropylene fiber, and 0.5 parts of aluminum powder paste; add the 52.5 grade low-alkali cement, modified fly ash, and vitrified microspheres to the water and stir evenly, then add the polycarboxylate superplasticizer and mineralized cross-linked modified polypropylene fiber and continue stirring evenly; after adding the aluminum powder paste, stir at a stirring speed of 200 r / min for 30 s to obtain a lightweight slurry; Step S4: Inject the lightweight slurry into the wall panel extrusion molding machine and form it under a pressure of 0.5MPa; cut it into blanks of specified size and place them in an environment with a temperature of 15℃ and a relative humidity of 60% for natural curing for 7 days to obtain the energy-saving lightweight porous thermal insulation partition wall panel.

[0037] Example 2 A method for preparing an energy-saving lightweight porous thermal insulation partition board includes the following preparation steps: Step S1: Take 2 parts of zinc stearate, 2 parts of silane coupling agent KH-550, 55 parts of water, 100 parts of grade I fly ash, and 5 parts of potassium carbonate; add zinc stearate and silane coupling agent KH-550 to water, heat and stir at 50℃ for 20 min to form a zinc stearate emulsion; add grade I fly ash to the zinc stearate emulsion, heat to 80℃ and stir for 40 min; add potassium carbonate and continue to react at 80℃ for 50 min; after the reaction is complete, filter, wash 3 times with deionized water, transfer to a forced-air drying oven, dry at 90℃ for 3 h, grind after drying, calcine at 600℃ in a muffle furnace for 2 h, and pass through a 300-mesh sieve to obtain modified fly ash; Step S2: Take 12 parts of polypropylene fiber, 200 parts of water, 20 parts of liquid silica sol, and 6 parts of calcium chloride; add the polypropylene fiber to the water and ultrasonically disperse it for 22 minutes at 300W to obtain a polypropylene fiber suspension; add the liquid silica sol to the polypropylene fiber suspension, and then add calcium chloride and stir evenly; adjust the pH of the system to 9 with 0.5% ammonia water and age it in a constant temperature water bath at 60℃ for 4 hours; after filtration, wash once with deionized water and dry in a 90℃ forced-air drying oven for 3 hours to obtain mineralized crosslinked modified polypropylene fiber; Step S3: Take 150 parts of 52.5 grade low-alkali cement, 40 parts of modified fly ash, 25 parts of vitrified microspheres, 68 parts of water, 2 parts of polycarboxylate superplasticizer, 7 parts of mineralized cross-linked modified polypropylene fiber, and 2 parts of aluminum powder paste; add the 52.5 grade low-alkali cement, modified fly ash, and vitrified microspheres to the water and stir evenly, then add the polycarboxylate superplasticizer and mineralized cross-linked modified polypropylene fiber and continue stirring evenly; after adding the aluminum powder paste, stir at a stirring speed of 300 r / min for 60 s to obtain a lightweight slurry; Step S4: Inject the lightweight slurry into the wall panel extrusion molding machine and form it under a pressure of 1.5MPa; cut it into blanks of specified size and place them in an environment with a temperature of 20℃ and a relative humidity of 70% for natural curing for 15 days to obtain the energy-saving lightweight porous thermal insulation partition wall panel.

[0038] Example 3 A method for preparing an energy-saving lightweight porous thermal insulation partition board includes the following preparation steps: Step S1: Take 5 parts of zinc stearate, 3 parts of silane coupling agent KH-550, 80 parts of water, 120 parts of grade I fly ash, and 8 parts of potassium carbonate; add zinc stearate and silane coupling agent KH-550 to water, heat and stir at 60℃ for 30 min to form a zinc stearate emulsion; add grade I fly ash to the zinc stearate emulsion, heat to 90℃ and stir for 60 min; add potassium carbonate and continue to react at 90℃ for 90 min; after the reaction is complete, filter, wash 4 times with deionized water, transfer to a forced-air drying oven, dry at 100℃ for 4 h, grind after drying, calcine in a muffle furnace at 700℃ for 3 h, and pass through a 400-mesh sieve to obtain modified fly ash; Step S2: Take 20 parts of polypropylene fiber, 300 parts of water, 30 parts of liquid silica sol, and 10 parts of calcium chloride; add the polypropylene fiber to the water and ultrasonically disperse it for 30 minutes at 400W power to obtain a polypropylene fiber suspension; add the liquid silica sol to the polypropylene fiber suspension, and then add calcium chloride and stir evenly; adjust the pH of the system to 10 with 0.5% ammonia water and age it in a constant temperature water bath at 70℃ for 4 hours; after filtration, wash twice with deionized water and dry in a 100℃ forced-air drying oven for 4 hours to obtain mineralized crosslinked modified polypropylene fiber; Step S3: Take 200 parts of 52.5 grade low-alkali cement, 60 parts of modified fly ash, 40 parts of vitrified microspheres, 100 parts of water, 3 parts of polycarboxylate superplasticizer, 12 parts of mineralized cross-linked modified polypropylene fiber, and 3 parts of aluminum powder paste; add the 52.5 grade low-alkali cement, modified fly ash, and vitrified microspheres to the water and stir evenly, then add the polycarboxylate superplasticizer and mineralized cross-linked modified polypropylene fiber and continue stirring evenly; after adding the aluminum powder paste, stir at a stirring speed of 400 r / min for 90 s to obtain a lightweight slurry; Step S4: Inject the lightweight slurry into the wall panel extrusion molding machine and form it under a pressure of 2MPa; cut it into blanks of specified size and place them in an environment with a temperature of 30℃ and a relative humidity of 80% for natural curing for 28 days to obtain the energy-saving lightweight porous thermal insulation partition wall panel.

[0039] Comparative Example 1 Compared with Example 1, this comparative example replaces "modified fly ash" with an equal mass of "grade 1 fly ash". All other steps and parameters are the same, and will not be repeated here. The final result is an energy-saving lightweight porous thermal insulation partition board.

[0040] Comparative Example 2 Compared with Example 1, this comparative example did not add potassium carbonate in step S1, but the remaining steps and parameters were the same. This comparative example will not be repeated here. Finally, an energy-saving lightweight porous thermal insulation partition board was obtained.

[0041] Comparative Example 3 Compared with Example 1, this comparative example does not involve calcination in step S1 to obtain modified fly ash. The remaining steps and parameters are the same, and will not be repeated here. The final result is an energy-saving lightweight porous thermal insulation partition board.

[0042] Comparative Example 4 Compared with Example 1, this comparative example replaces "mineralized crosslinked modified polypropylene fiber" with an equal mass of "polypropylene fiber". All other steps and parameters are the same, and will not be repeated in this comparative example. Finally, an energy-saving lightweight porous thermal insulation partition board is obtained.

[0043] The energy-saving lightweight porous thermal insulation partition boards prepared in Examples 1-3 and Comparative Examples 1-4 were tested, and the results are recorded in Table 1.

[0044] 1. Bulk density testing method: Referring to GB / T 23450-2009, specimens with dimensions of 300mm×300mm×90mm were cut from the energy-saving lightweight porous thermal insulation partition boards prepared in Examples 1-3 and Comparative Examples 1-4, respectively. Five parallel specimens were prepared for each group. The specimens were dried in a 105℃ forced-air drying oven at an average temperature of 25±2℃ until constant weight (the difference between two consecutive weighings ≤0.5%). After cooling to room temperature, they were weighed using an electronic balance (accuracy 0.1g), and the actual dimensions of the specimens were measured using vernier calipers (accuracy 0.02mm). The volume was calculated, and the bulk density was calculated using the following formula: The result is the arithmetic mean of 5 parallel samples.

[0045] 2. Methods for testing thermal conductivity: Referring to GB / T 10294-2008, specimens with dimensions of 300mm×300mm×90mm were cut from the energy-saving lightweight porous thermal insulation partition boards prepared in Examples 1-3 and Comparative Examples 1-4, respectively. Five parallel specimens were prepared for each group. The specimens were tested using a protective hot plate thermal conductivity meter at an average temperature of 25±2℃. The heat flux density through the specimen, the temperature difference between the two surfaces of the specimen, and the thickness were measured. The thermal conductivity λ value was calculated, and the result was taken as the arithmetic mean of the five parallel specimens.

[0046] 3. Method for testing compressive strength: Referring to GB / T 23450-2009, 100mm×100mm×90mm specimens were cut from the energy-saving lightweight porous thermal insulation partition boards prepared in Examples 1-3 and Comparative Examples 1-4, respectively. Five parallel specimens were prepared for each group. The upper and lower surfaces of the specimens were ground smooth with a grinding wheel and placed on a YES-2000 compression testing machine. A uniform loading rate of 2.5mm / min was applied until the specimen failed. The maximum failure load was recorded, and the results were calculated. The formula is: The result is the arithmetic mean of 5 parallel samples (outliers are removed).

[0047] 4. Impact resistance testing methods: Referring to GB / T 23450-2009, 600mm×400mm×90mm specimens were cut from the energy-saving lightweight porous thermal insulation partition boards prepared in Examples 1-3 and Comparative Examples 1-4, respectively. Five parallel specimens were prepared for each group and fixed on a special test frame, with the impact surface of the specimen perpendicular to the ground. A steel ball with a mass of 0.5kg was dropped freely from a height of 1.0m to impact the center position of the specimen. After each impact, the specimen was observed to see if cracks appeared. The maximum number of impacts when no visible cracks appeared was recorded. The minimum value of the five parallel specimens was taken as the result. The standard requires ≥5 impacts.

[0048] 5. Method for detecting drying shrinkage: Referring to GB / T 23450-2009, 100mm×100mm×400mm specimens were cut from the energy-saving lightweight porous thermal insulation partition boards prepared in Examples 1-3 and Comparative Examples 1-4, respectively. After curing under standard conditions (20℃, 60% relative humidity) for 7 days, the initial length of the specimens was measured using a dial indicator (accuracy 0.001mm). Subsequently, the specimens were placed in a constant temperature and humidity chamber at 23℃ and 50% relative humidity, and the final length was measured after 28 days. The drying shrinkage value was calculated using the following formula: The detection result at 28 days is taken as the final value.

[0049] 6.24h water absorption rate test method Referring to GB / T 23450-2009, 200mm×200mm×90mm specimens were cut from the energy-saving lightweight porous thermal insulation partition boards prepared in Examples 1-3 and Comparative Examples 1-4, respectively. Five parallel specimens were prepared for each group. After drying to constant weight, the specimens were weighed (recorded as m0). The specimens were then completely immersed in deionized water at 23℃, with the water level 20mm above the upper surface of the specimens. After soaking for 24 hours, the specimens were removed, wiped dry with a dry cloth, and weighed immediately (recorded as m1). The water absorption rate was calculated using the following formula: The result is the arithmetic mean of 5 parallel samples.

[0050] 7. Hanging Force Testing Method 600mm×400mm×90mm specimens were cut from the energy-saving lightweight porous thermal insulation partition boards prepared in Examples 1-3 and Comparative Examples 1-4. A hole (10mm diameter, 45mm depth) was drilled in the center of the specimen, a special hanger was inserted and fixed, a 1000N weight was suspended, and the specimens were left to stand in a standard curing environment for 24 hours. The specimens were then observed to see if cracks with a width exceeding 0.5mm appeared, and whether they met the requirements was determined.

[0051] Table 1: Performance Test Results of Energy-Saving Lightweight Porous Thermal Insulation Wall Panels

[0052] According to the data in Table 1, the energy-saving lightweight porous thermal insulation partition boards prepared in Examples 1-3 achieved synergistic optimization in terms of lightweight, thermal insulation, mechanical strength, dimensional stability and water resistance, demonstrating excellent comprehensive performance.

[0053] Comparing Comparative Example 1 with Example 1, it can be seen that replacing modified fly ash with unmodified fly ash significantly increases the bulk density of the partition wall panel, while drastically reducing its compressive strength and impact resistance. Simultaneously, the water absorption rate increases significantly, and the drying shrinkage value also increases. This is because fly ash has a hydrophilic surface and low activity, failing to provide effective hydrophobicity and interfacial reinforcement within the cement matrix. Furthermore, its high water absorption interferes with the hydration process and may introduce harmful pores, thereby deteriorating the lightweight, mechanical properties, and durability of the panel.

[0054] Comparing Comparative Example 2 with Example 1, it can be seen that without the addition of potassium carbonate during the fly ash modification process, the compressive strength of the prepared partition board is lower than that of Example 1, and the thermal insulation performance is also slightly reduced. This indicates that potassium carbonate, as an alkali activator, is crucial for fully activating the potential pozzolanic activity of fly ash. Without this step, the chemical activity of fly ash cannot be effectively enhanced, resulting in insufficient participation in the hydration reaction of the cementitious system, thereby weakening its contribution to the matrix strength and potentially affecting the optimization of the pore structure inside the slurry.

[0055] Comparing Comparative Example 3 with Example 1, it is evident that omitting the calcination step during fly ash modification leads to a deterioration in the performance of the finished product in multiple aspects. Calcination not only thoroughly removes residual impurities from the fly ash surface, preventing interference with the subsequent foaming process, but also further stabilizes and strengthens the hydrophobic modified layer on the fly ash surface and improves the particle surface morphology through activation. The lack of calcination prevents these optimization effects from being achieved, resulting in a decline in the overall performance of the partition wall panel.

[0056] Comparing Example 4 with Example 1, it is evident that replacing the modified fibers with ordinary polypropylene fibers without mineralization and cross-linking significantly degraded the impact resistance of the partition wall panel, and minor cracks appeared during the hanging force test. This directly demonstrates that surface mineralization and cross-linking treatment of polypropylene fibers using silica sol and calcium chloride enhances the interfacial bond between the polypropylene fibers and the cement matrix. Unmodified polypropylene fibers have a weak bond with the matrix, easily slipping under stress and failing to effectively transfer and disperse stress, thus significantly reducing the toughness and crack resistance of the partition wall panel.

[0057] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. Modifications made by those skilled in the art to this embodiment without contributing any inventive step after reading this specification should be included within the protection scope of the present invention.

Claims

1. A method for preparing an energy-saving lightweight porous thermal insulation partition board, characterized in that, It comprises the following steps: Step S1: zinc stearate and silane coupling agent are added into water, heated and stirred to form a zinc stearate emulsion, fly ash is added into the zinc stearate emulsion, heated and stirred to react, potassium carbonate is added to continue the reaction, after the reaction, filtration, drying, washing, grinding, calcination and sieving are performed to obtain modified fly ash; Step S2: polypropylene fibers are added into water, ultrasonic dispersion is performed to obtain a polypropylene fiber suspension, silica sol is added into the polypropylene fiber suspension, calcium chloride is added, the system pH value is adjusted, aging, filtration, washing and drying are performed to obtain mineralized cross-linked modified polypropylene fibers; Step S3: cement, modified fly ash and vitrified microbeads are added into water, stirred uniformly, water reducing agent and mineralized cross-linked modified polypropylene fibers are added, stirred uniformly, and foaming agent is added, stirred to obtain light slurry; Step S4: the light slurry is added into a wallboard extrusion molding machine for extrusion molding, cutting and natural curing to obtain the energy-saving light-weight porous thermal insulation partition wallboard.

2. The method for preparing an energy-saving lightweight porous thermal insulation partition wall panel according to claim 1, characterized in that, The weight parts of the raw materials in step S1 are as follows: zinc stearate 1-5 parts, silane coupling agent 0.5-3 parts, water 30-80 parts, fly ash 60-120 parts and potassium carbonate 2-8 parts.

3. The method of claim 1, wherein the method further comprises the steps of: adding 0.5-2 wt% of a foaming agent to the mixture; and mixing the mixture to form a homogeneous mixture. In step S1, the heating and stirring temperature for forming the zinc stearate emulsion is 40-60℃, and the stirring time is 10-30 min.

4. The method of claim 1, wherein the method further comprises the steps of: adding 0.5-2 wt% of a foaming agent to the mixture; and mixing the mixture to form a homogeneous mixture. In step S1, after the addition of fly ash, the temperature is increased to 70-90℃, and the stirring reaction is performed for 20-60 min, and after the addition of potassium carbonate, the reaction is continued at 70-90℃ for 30-90 min.

5. The method of claim 1, wherein the method further comprises the steps of: adding 0.5-2 wt% of a foaming agent to the mixture; and mixing the mixture to form a homogeneous mixture. In step S1, the calcination is performed in a muffle furnace, the calcination temperature is 500-700℃, and the calcination time is 1-3 h.

6. The method of claim 1, wherein the method further comprises the steps of: adding 0.5-2 wt% of a foaming agent to the mixture; and mixing the mixture to form a homogeneous mixture. The weight parts of the raw materials in step S2 are as follows: polypropylene fibers 5-20 parts, water 100-300 parts, silica sol 10-30 parts and calcium chloride 2-10 parts.

7. The method of claim 1, wherein the method further comprises the steps of: adding 0.5 to 2 wt% of a foaming agent to the mixture; and mixing the mixture to form a slurry. In step S2, the ultrasonic dispersion power is 200-400 W, the dispersion time is 15-30 min, the system pH value is adjusted to 8-10, the aging time is 2-4 h, the drying temperature is 80-100℃, and the drying time is 2-4 h.

8. The method of claim 1, wherein the method further comprises the steps of: adding 0.5-2 wt% of a foaming agent to the mixture; and mixing the mixture to form a homogeneous mixture. The weight parts of the raw materials in step S3 are as follows: cement 100-200 parts, modified fly ash 20-60 parts, vitrified microbeads 10-40 parts, water 40-100 parts, water reducing agent 0.5-3 parts, mineralized cross-linked modified polypropylene fibers 3-12 parts and foaming agent 0.5-3 parts.

9. The method of claim 1, wherein the method further comprises the steps of: adding 0.5-2 wt% of a foaming agent to the mixture; and mixing the mixture to form a homogeneous mixture. In step S4, the extrusion molding pressure is 0.5-2 MPa, the natural curing temperature is 15-30℃, the relative humidity is 60-80%, and the curing time is 7-28 d.

10. An energy-saving light-weight porous thermal insulation partition wallboard prepared by the method according to any one of claims 1-9.

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