An assembled energy-saving thermal insulation board based on variable-temperature foaming and a preparation method thereof

Abstract

This invention provides a prefabricated energy-saving insulation board based on temperature-varying foaming, composed of the following raw materials in parts by weight: 60-80 parts blast furnace slag powder, 10-20 parts solid waste-based sulfur-aluminum-iron cementitious clinker, 10-25 parts raw by-product gypsum, 2-6 parts silica fume, 0.5-2 parts calcium carbide slag, 0.5-1.2 parts calcium stearate, 0.2-0.6 parts polycarboxylate superplasticizer, 0.02-0.1 parts xanthan gum, 0.2-1 parts dispersible latex powder, 0.1-0.5 parts chopped fibers, 0.02-0.06 parts composite retarder, and foaming agent. This invention selects hydrogen peroxide as the foaming agent because of the low alkalinity of this cementitious system; hydrogen peroxide will not decompose rapidly after addition, thus extending the stirring time after hydrogen peroxide addition while ensuring the fresh slurry has high fluidity. After the mixed slurry is poured into the mold, a medium-temperature heat source is applied to catalyze the decomposition of hydrogen peroxide. At this point, the foaming and expansion process of the fresh slurry occurs simultaneously with the solidification and hardening process, thus achieving controllable regulation of the foaming process and increasing the slurry hardening speed. Ultimately, this invention provides a solid waste-based energy-saving insulation board for prefabricated buildings based on variable-temperature foaming.

Description

Technical Field

[0001] This invention belongs to the field of solid waste-based energy-saving insulation materials, and specifically relates to a prefabricated energy-saving insulation board based on variable temperature foaming and its preparation method. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Building carbon emissions are a major source of greenhouse gases. Developing high-performance, low-energy-consumption energy-saving insulation panels for prefabricated buildings is crucial for improving building energy efficiency, reducing the carbon footprint throughout the building's life cycle, and promoting the green transformation and sustainable development of prefabricated buildings. Currently, prefabricated energy-saving insulation panels are primarily autoclaved aerated concrete (AAC) panels, but their preparation process requires curing in an autoclave at 180-200℃ and 1.1-2 MPa saturated steam pressure for 8-24 hours. This curing process involves high energy consumption and CO2 emissions, accounting for approximately 20% of the overall environmental impact of AAC panels. Furthermore, their raw materials typically require cement, lime, and silica sand. The cement and lime industries account for approximately 8% and 1% of global anthropogenic CO2 emissions, respectively. Over-exploitation of sand and gravel seriously threatens the stability of river channels and river ecosystems. These factors not only limit the low-carbon sustainable development of energy-saving insulation materials for prefabricated buildings but also lead to environmental degradation. For non-autoclaved aerated concrete, on the one hand, the early performance of the product is insufficient, easily causing problems such as structural collapse of the energy-saving insulation panels. On the other hand, the chemical foaming process is often very rapid, and excessively rapid foaming is not conducive to the formation of a uniform pore structure. Simultaneously, excessively rapid foaming leads to a highly viscous slurry, placing high demands on mixing and casting equipment. Therefore, it is difficult to match the strength development of autoclaved aerated concrete (AAC) energy-saving insulation panels with the foaming expansion process. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a prefabricated energy-saving insulation board based on variable-temperature foaming and its preparation method, aiming to improve the performance and reduce the overall energy consumption of the solid waste-based prefabricated energy-saving insulation board through a mild curing method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In view of the high carbon emissions and high energy consumption of existing autoclaved aerated concrete (AAC) panels in terms of raw materials and curing processes; the dual disadvantages of non-autoclaved energy-saving insulation panels in terms of strength and pore structure; and the problem of mismatch between the strength development of the substrate and the rapid foaming expansion process in chemical foaming processes, this invention provides a prefabricated energy-saving insulation panel based on variable temperature foaming and its preparation method.

[0007] The first aspect of this invention provides a prefabricated energy-saving insulation board based on temperature-varying foaming, comprising the following raw materials in parts by weight: 60-80 parts blast furnace slag powder, 10-20 parts solid waste-based sulfur-aluminum-iron cementitious clinker, 10-25 parts original by-product gypsum, 2-6 parts silica fume, 0.5-2 parts calcium carbide slag, 0.5-1.2 parts calcium stearate, 0.2-0.6 parts polycarboxylate superplasticizer, 0.02-0.1 parts xanthan gum, 0.2-1 parts dispersible latex powder, 0.1-0.5 parts chopped fibers, 0.2-0.6 parts composite retarder, and foaming agent;

[0008] The foaming agent is a 30% hydrogen peroxide solution, used at a concentration of 2-5% of the total mass of the cementitious material. Alternatively, industrial-grade hydrogen peroxide solutions with concentrations of 27.5% and 35% are also applicable.

[0009] In some implementations, the water-cement ratio is 0.3-0.4.

[0010] In some embodiments, the solid waste-based sulfur-aluminum-iron cementitious clinker is made from coal gangue, red mud, aluminum ash, carbide slag, and by-product gypsum as raw materials through low-temperature calcination at 1200-1250℃.

[0011] In the supersulfate and sulfoaluminate system, slag continuously dissolves silica and aluminum ions from its vitreous state, which can participate in the synthesis of AFt and CSH gels, resulting in a dense structure and improved later-stage performance. Furthermore, as a solid waste, its source is lower-carbon and sustainable.

[0012] In some embodiments, the composite retarder is composed of boric acid, citric acid and tartaric acid in a ratio of 1:1:2.

[0013] In some implementations, the chopped fibers are made of polypropylene fibers, glass fibers, etc., and are 6-12 mm in length.

[0014] A second aspect of the present invention provides a method for preparing a prefabricated energy-saving insulation board based on variable-temperature foaming, comprising:

[0015] Solid waste-based sulfur-aluminum-iron cementitious clinker, blast furnace slag powder, silica fume, and carbide slag are ground separately and then premixed to obtain the first mixture.

[0016] Add calcium stearate, xanthan gum, and dispersible latex powder to the first mixture, mix well, and obtain the second mixture;

[0017] The raw by-product gypsum, polycarboxylate superplasticizer, chopped fibers, composite retarder, and water are mixed uniformly by wet method at a water-cement ratio of 0.3-0.4 to obtain a water-containing mixture.

[0018] The second mixture is mixed with the water-containing mixture, and the mixture is first stirred slowly for 30-40 seconds, and then stirred at high speed for 3-4 minutes to obtain a mixed slurry; hydrogen peroxide is added during the slow stirring process, followed by high-speed stirring for 1 minute.

[0019] The mixed slurry is poured into the mold box of the board, and after the mold box is covered with a film, the temperature of the board is maintained at 40-60℃ for 12-24 hours by external heating. After demolding and curing, the board is obtained.

[0020] This invention utilizes the low alkalinity of the gelling system and the gas-generating properties of hydrogen peroxide through medium-temperature decomposition. Upon initial addition, hydrogen peroxide does not actively decompose, thus improving its uniformity and ensuring the fresh slurry maintains high fluidity. When the mixed slurry is poured into a mold, a medium-temperature heat source catalyzes the decomposition of hydrogen peroxide. At this point, the foaming and expansion process of the fresh slurry occurs concurrently with the solidification and hardening process, thereby achieving controllable regulation of the foaming process and accelerating the slurry's hardening speed.

[0021] In some embodiments, the fineness of the first mixture is such that the residue on a 200-mesh square-hole sieve is less than 10%.

[0022] In some embodiments, the rotation speed of the slow stirring is 140±5 r / min, depending on the disturbance state of the stirring teeth in the stirring tank. If the disturbance is small, it is recommended to increase the rotation speed appropriately.

[0023] In some embodiments, the high-speed stirring speed is 280±10 r / min, which depends on the disturbance state of the stirring teeth in the stirring tank. If the disturbance is small, it is recommended to increase the speed appropriately.

[0024] More specifically, including:

[0025] (1) Solid waste-based sulfur-aluminum-iron cementitious clinker is made from coal gangue, red mud, aluminum ash, carbide slag, and by-product gypsum through low-temperature calcination at 1200-1250℃, and is ready for use.

[0026] (2) Take 10-20 parts of solid waste-based sulfur-aluminum-iron cement clinker from (1), 60-80 parts of blast furnace slag powder, 2-6 parts of silica fume, and 0.5-2 parts of carbide slag, and grind and premix them. The fineness requirement is that the residue on a 200-mesh square hole sieve is less than 10%.

[0027] (3) Add 0.5-1.2 parts of calcium stearate, 0.02-0.1 parts of xanthan gum, and 0.2-1 parts of dispersible latex powder to the mixture in (2), mix evenly and set aside;

[0028] (4) Take 10-25 parts of unprocessed by-product gypsum, 0.2-0.6 parts of polycarboxylate superplasticizer, 0.1-0.5 parts of chopped fiber, 0.02-0.06 parts of composite retarder, 0.3-0.4 parts of water-cement ratio, and 30-40 parts of water, mix them by wet method and set aside.

[0029] (5) Take the mixture from (3) and mix it into the water-containing mixture from (4). Stir slowly for 30 seconds, then stir at high speed for 3 minutes to make a mixed slurry.

[0030] (6) During the slow stirring of the slurry in (5), add 2-5 parts of hydrogen peroxide, and then stir at high speed for 1 minute;

[0031] (7) Pour the fresh slurry mixed in (6) into the board mold box. After covering the mold box with plastic wrap, keep the board temperature at 40-60℃ for 12-24 hours by external heating. Finally, after the prefabricated energy-saving insulation material has completed expansion and hardening, demold it. Then, properly cure it in the standard curing room to obtain the prefabricated energy-saving insulation board.

[0032] A third aspect of the present invention provides the application of the above-mentioned prefabricated energy-saving insulation board based on temperature-controlled foaming in the construction field.

[0033] Beneficial effects of the present invention

[0034] (1) Compared with existing technologies, the prefabricated energy-saving insulation board prepared by this invention eliminates the high-temperature, high-pressure, and steam curing process in an autoclave, making the preparation process simpler and safer, and significantly reducing equipment investment. The raw materials are almost entirely derived from bulk industrial solid waste. The strength of the material comes from fully utilizing the potential hydration activity of blast furnace slag powder in the persulfate system, leveraging the early strength, rapid hardening, and high strength characteristics of solid waste-based sulfur-aluminum-iron cementitious materials, and compounding silica fume and carbide slag as slurry functional regulators, ultimately achieving a hardened system with C(A)-SH and AFt as the main hydration products. In the foaming process of the material, existing technologies mostly use aluminum powder or hydrogen peroxide as foaming agents. Furthermore, all technologies involve rapid and intense gas expansion after the foaming agent is added to the fresh slurry, resulting in a rapid decrease in the flow state and an increase in consistency of the fresh slurry. This is detrimental to the high-precision molding of the slurry during the casting process. This invention selects hydrogen peroxide as the foaming agent because of the low alkalinity of this gelling system. Hydrogen peroxide does not decompose rapidly after addition, thus extending the stirring time after its addition and ensuring the fresh slurry maintains high fluidity. When the mixed slurry is poured into a mold, a medium-temperature heat source is applied to catalyze the decomposition of hydrogen peroxide. At this point, the foaming and expansion process of the fresh slurry occurs concurrently with the solidification and hardening process, thereby achieving controllable regulation of the foaming process and increasing the slurry hardening speed. Ultimately, this invention prepares a solid waste-based energy-saving insulation board for prefabricated buildings based on variable-temperature foaming.

[0035] (2) The raw materials of this invention are almost entirely derived from industrial solid waste. The expansion of the slurry and hardening of the matrix are achieved through temperature-variable curing under mild conditions, resulting in excellent overall performance of the product.

[0036] (3) The gelling system of the present invention belongs to the persulfate slag system. It fully explores the hydration activity of blast furnace slag in the persulfate system, and takes advantage of the early strength, fast hardening and high strength characteristics of solid waste-based sulfur-aluminum-iron gelling materials. It is compounded with silica fume and carbide slag as slurry functional regulators, and finally realizes a hardening system with C(A)-SH and AFt as the main hydration products. The product raw material end and process end are more energy-saving, and the overall carbon footprint can be reduced by more than 70%.

[0037] (4) The present invention catalyzes the decomposition of hydrogen peroxide by applying a medium-temperature heat source. At this time, the foaming and expansion process of the fresh slurry and the solidification and hardening process are carried out in parallel, thereby realizing the controllable regulation of the foaming process and the improvement of the slurry hardening speed.

[0038] (5) The preparation method of the present invention is simple, practical and easy to promote. Attached Figure Description

[0039] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. Exemplary embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0040] Figure 1 Process flow diagram of this invention;

[0041] Figure 2 Diagram of the pore structure of the energy-saving and heat-insulating material of this invention. Detailed Implementation

[0042] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0043] The present invention will be further described in detail below with reference to specific embodiments. It should be noted that the specific embodiments are explanations of the present invention and not limitations thereof.

[0044] In the following examples, the solid waste-based sulfur-aluminum-iron cementitious clinker is prepared by calcining 16 parts of coal gangue, 10 parts of red mud, 30 parts of aluminum ash, 23 parts of calcium carbide slag, and 25 parts of by-product gypsum at a low temperature of 1220℃, and is ready for use.

[0045] Polycarboxylate superplasticizer, brand name Sika, commercially available product.

[0046] Example 1

[0047] A prefabricated energy-saving insulation board based on variable-temperature foaming is disclosed. The board uses blast furnace slag powder, solid waste-based sulfur-aluminum-iron cementitious clinker, and undisturbed desulfurized gypsum as the main cementing materials, carbide slag and silica fume as solid waste-based functional regulators, calcium stearate and xanthan gum as foam stabilizers, dispersible latex powder as cell reinforcing agents, chopped fibers as toughening materials, polycarboxylate superplasticizer and composite retarder as rheology modifiers, and 30% hydrogen peroxide as a foaming agent. The water used meets the requirements for concrete mixing water. The foaming process adopts a unique variable-temperature foaming method to achieve a balanced and stable expansion and hardening of the slurry under mild conditions.

[0048] A prefabricated energy-saving insulation board based on variable-temperature foaming and its preparation method, comprising the following steps:

[0049] (1) Solid waste-based sulfur-aluminum-iron cementitious clinker is made by calcining 16% coal gangue, 10% red mud, 30% aluminum ash, 23% carbide slag and 25% by-product gypsum at a low temperature of 1220℃ for later use. Its main mineral phases are Fe-Al dissolved calcium sulfoaluminate, anhydrous calcium sulfoaluminate, dicalcium silicate, iron phase, etc.

[0050] (2) Take 20 parts of solid waste-based sulfur-aluminum-iron cement clinker from (1), 60 parts of blast furnace slag powder, 2 parts of silica fume, and 1 part of carbide slag, and grind and premix them. The fineness requirement is that the residue on a 200-mesh square hole sieve is less than 10%.

[0051] (3) Add 0.8 parts of calcium stearate, 0.04 parts of xanthan gum, and 0.5 parts of dispersible latex powder to the mixture in (2), mix well and set aside;

[0052] (4) Take 20 parts of unprocessed by-product gypsum, 0.4 parts of polycarboxylate superplasticizer, 0.2 parts of chopped fiber, 0.06 parts of composite retarder, and 30 parts of water, mix them by wet method and set aside;

[0053] (5) Take the mixture from (3) and mix it into the water-containing mixture from (4). First, stir slowly (145r / min) for 30 seconds, then stir at high speed (285r / min) for 3 minutes to make a mixed slurry.

[0054] (6) Stir the mixed slurry in (5) at a slow speed (145r / min). During the slow stirring process, add 3 parts of hydrogen peroxide, and then stir at a high speed (285r / min) for 1 min.

[0055] (7) Pour the fresh slurry mixed in (6) into the board mold box. After covering the mold box with plastic wrap, keep the board temperature at 40°C for 24 hours by external heating. Finally, after the prefabricated energy-saving insulation material has completed expansion and hardening, demold it. Then, properly cure it in the standard curing room to obtain the prefabricated energy-saving insulation board.

[0056] Example 2

[0057] A prefabricated energy-saving insulation board based on variable-temperature foaming is disclosed. The board uses blast furnace slag powder, solid waste-based sulfur-aluminum-iron cementitious clinker, and undisturbed desulfurized gypsum as the main cementing materials, carbide slag and silica fume as solid waste-based functional regulators, calcium stearate and xanthan gum as foam stabilizers, dispersible latex powder as cell reinforcing agents, chopped fibers as toughening materials, polycarboxylate superplasticizer and composite retarder as rheology modifiers, and 30% hydrogen peroxide as a foaming agent. The water used meets the requirements for concrete mixing water. The foaming process adopts a unique variable-temperature foaming method to achieve a balanced and stable expansion and hardening of the slurry under mild conditions.

[0058] A prefabricated energy-saving insulation board based on variable-temperature foaming and its preparation method, comprising the following steps:

[0059] (1) Solid waste-based sulfur-aluminum-iron cementitious clinker is made by calcining coal gangue, red mud, aluminum ash, carbide slag and by-product gypsum at a low temperature of 1200℃ for use. Its main mineral phases are Fe-Al dissolved calcium sulfoaluminate, anhydrous calcium sulfoaluminate, dicalcium silicate, iron phase, etc.

[0060] (2) Take 15 parts of solid waste-based sulfur-aluminum-iron cement clinker, 70 parts of blast furnace slag powder, 4 parts of silica fume, and 1.5 parts of carbide slag from (1), and grind and premix them. The fineness requirement is that the residue on a 200-mesh square hole sieve is less than 10%.

[0061] (3) Add 1 part calcium stearate, 0.06 parts xanthan gum, and 0.8 parts dispersible latex powder to the mixture in (2), mix well and set aside;

[0062] (4) Take 15 parts of unprocessed by-product gypsum, 0.5 parts of polycarboxylate superplasticizer, 0.3 parts of chopped fiber, 0.04 parts of composite retarder, and 35 parts of water, mix them by wet method and set aside.

[0063] (5) Take the mixture from (3) and mix it into the water-containing mixture from (4). First, stir slowly (145r / min) for 30 seconds, then stir at high speed (285r / min) for 3 minutes to make a mixed slurry.

[0064] (6) Stir the mixed slurry in (5) at a slow speed (145r / min). During the slow stirring process, add 4 parts of hydrogen peroxide, and then stir at a high speed (285r / min) for 1 min.

[0065] (7) Pour the fresh slurry mixed in (6) into the board mold box. After covering the mold box with plastic wrap, keep the board temperature at 50°C for 16 hours by external heating. Finally, after the prefabricated energy-saving insulation material has completed expansion and hardening, demold it. Then, after proper curing in the standard curing room, the prefabricated energy-saving insulation board can be obtained.

[0066] Example 3

[0067] A prefabricated energy-saving insulation board based on variable-temperature foaming is disclosed. The board uses blast furnace slag powder, solid waste-based sulfur-aluminum-iron cementitious clinker, and undisturbed desulfurized gypsum as the main cementing materials, carbide slag and silica fume as solid waste-based functional regulators, calcium stearate and xanthan gum as foam stabilizers, dispersible latex powder as cell reinforcing agents, chopped fibers as toughening materials, polycarboxylate superplasticizer and composite retarder as rheology modifiers, and 30% hydrogen peroxide as a foaming agent. The water used meets the requirements for concrete mixing water. The foaming process adopts a unique variable-temperature foaming method to achieve a balanced and stable expansion and hardening of the slurry under mild conditions.

[0068] A prefabricated energy-saving insulation board based on variable-temperature foaming and its preparation method, comprising the following steps:

[0069] (1) Solid waste-based sulfur-aluminum-iron cementitious clinker is made from coal gangue, red mud, aluminum ash, carbide slag, and by-product gypsum through low-temperature calcination at 1180℃, and is ready for use.

[0070] (2) Take 10 parts of solid waste-based sulfur-aluminum-iron cement clinker from (1), 80 parts of blast furnace slag powder, 6 parts of silica fume, and 2 parts of carbide slag, and grind and premix them. The fineness requirement is that the residue on a 200-mesh square hole sieve is less than 10%.

[0071] (3) Add 1.2 parts of calcium stearate, 0.1 parts of xanthan gum, and 1 part of dispersible latex powder to the mixture in (2), mix well and set aside;

[0072] (4) Take 10 parts of unprocessed by-product gypsum, 0.6 parts of polycarboxylate superplasticizer, 0.4 parts of chopped fiber, 0.02 parts of composite retarder, and 40 parts of water, mix them by wet method and set aside;

[0073] (5) Take the mixture from (3) and mix it into the water-containing mixture from (4). First, stir slowly (145r / min) for 30 seconds, then stir at high speed (285r / min) for 3 minutes to make a mixed slurry.

[0074] (6) Stir the mixed slurry in (5) at a slow speed (145r / min). During the slow stirring process, add 5 parts of hydrogen peroxide, and then stir at a high speed (285r / min) for 1 min.

[0075] (7) Pour the fresh slurry mixed in (6) into the board mold box. After covering the mold box with plastic wrap, keep the board temperature at 60°C for 12 hours by external heating. Finally, after the prefabricated energy-saving insulation material has completed expansion and hardening, demold it. Then, after proper curing in the standard curing room, the prefabricated energy-saving insulation board can be obtained.

[0076] Comparative Example 1

[0077] The difference from Example 1 is that solid waste-based sulfur-aluminum-iron cementitious clinker was not used, and the amount of blast furnace slag powder was adjusted to 80 parts.

[0078] Test results show that solid waste-based sulfur-aluminum-iron cementitious clinker is a core material. Its main function is to improve the early compressive strength of the material and enhance the stability of the early foam structure. Without the use of this material, the material cannot be cured and formed quickly in the early stage, and the mold collapse phenomenon occurs.

[0079] Comparative Example 2

[0080] The difference from Example 1 is that the original by-product gypsum was not used, and the amount of solid waste-based sulfur-aluminum-iron cementitious clinker was adjusted to 40 parts.

[0081] Test results show that gypsum provides sufficient calcium sulfate to the cementing system, promoting hydration, and also reduces costs. Without the addition of undiluted gypsum, the system lacks the calcium sulfate required for hydration, which can easily lead to unstable conversion of AFt to AFm, thus affecting performance.

[0082] Comparative Example 3

[0083] The difference from Example 1 is that hydroxypropyl cellulose ether is used instead of xanthan gum.

[0084] Test results show that xanthan gum enhances the cohesiveness of the slurry, reduces foam aggregation, and controls foam size. Although hydroxypropyl cellulose ether has a similar effect, xanthan gum is more effective at the same dosage.

[0085] Comparative Example 4

[0086] The difference from Example 1 is that no dispersible latex powder was added.

[0087] Test results show that latex powder can reduce the surface tension of the slurry, which is beneficial to reducing foaming resistance. In addition, its film-forming properties can further densify and strengthen the pore wall structure, improve the integrity of the pore wall, and reduce the water absorption rate.

[0088] Table 1. High-performance, low-energy-consumption solid waste-based energy-saving thermal insulation materials prepared in the examples.

[0089]

[0090] Table 2. High-performance, low-energy-consumption solid waste-based energy-saving insulation materials prepared in comparative examples.

[0091]

[0092]

[0093] As can be seen from the comparison between Example 1 and Comparative Example 1, solid waste-based sulfur-aluminum-iron cementitious clinker effectively improves the strength of the insulation board and reduces the water absorption and thermal conductivity.

[0094] As can be seen from the comparison between Example 1 and Comparative Example 2, the addition of unprocessed by-product gypsum improves the strength of the insulation board.

[0095] As can be seen from the comparison between Example 1 and Comparative Example 3, xanthan gum can better improve the strength of the insulation board and reduce the water absorption rate compared with hydroxypropyl cellulose ether.

[0096] As can be seen from the comparison between Example 1 and Comparative Example 4, the addition of dispersible latex powder improves the strength of the insulation board to a certain extent and reduces the water absorption and thermal conductivity.

[0097] Therefore, this invention achieves a high degree of matching between the strength development of solid waste-based cementitious materials and the foaming and expansion process of foam slurry through temperature regulation. Secondly, this invention eliminates the high energy consumption and carbon emission of autoclaving processes, achieving performance improvement and foaming expansion of energy-saving insulation boards under mild conditions. Thirdly, this invention solves the problems of mixing, casting, and molding of prefabricated energy-saving insulation boards, further improving product molding precision. Finally, this invention addresses the comprehensive utilization of large quantities of industrial solid waste.

[0098] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing prefabricated energy-saving insulation panels based on variable-temperature foaming, characterized in that, It is composed of the following raw materials in parts by weight: 60-80 parts blast furnace slag powder, 10-20 parts solid waste-based sulfur-aluminum-iron cementitious clinker, 10-25 parts raw by-product gypsum, 2-6 parts silica fume, 0.5-2 parts calcium carbide slag, 0.5-1.2 parts calcium stearate, 0.2-0.6 parts polycarboxylate superplasticizer, 0.02-0.1 parts xanthan gum, 0.2-1 parts dispersible latex powder, 0.1-0.5 parts chopped fibers, 0.02-0.06 parts composite retarder, and foaming agent; The foaming agent is a hydrogen peroxide solution with a mass concentration of 30%-33%, and the amount used is 2-5% of the total mass of the cementitious material. include: Solid waste-based sulfur-aluminum-iron cementitious clinker, blast furnace slag powder, silica fume, and carbide slag are ground separately and then premixed to obtain a first mixture; calcium stearate, xanthan gum, and dispersible latex powder are added to the first mixture and mixed evenly to obtain a second mixture; The raw by-product gypsum, polycarboxylate superplasticizer, chopped fibers, composite retarder, and water are mixed uniformly by wet method at a water-cement ratio of 0.3-0.4 to obtain a water-containing mixture. The second mixture is mixed with the water-containing mixture. The mixture is first stirred slowly for 30-40 seconds, and then stirred at high speed for 3-4 minutes to obtain a mixed slurry. The mixed slurry is then stirred slowly. During the slow stirring process, a foaming agent is added, and then the mixture is stirred at high speed for 1 minute. The mixed slurry is poured into the board mold box, and after the mold box is covered with a film, the temperature of the board is maintained at 40-60℃ for 12-24 hours by external heating. After demolding and curing, the board is obtained. The foaming and expansion process of the slurry and the curing and hardening process are carried out in parallel.

2. The method for preparing prefabricated energy-saving insulation panels based on variable-temperature foaming as described in claim 1, characterized in that, The solid waste-based sulfur-aluminum-iron cementitious clinker is made from coal gangue, red mud, aluminum ash, carbide slag, and by-product gypsum through low-temperature calcination at 1200-1250℃.

3. The method for preparing prefabricated energy-saving insulation panels based on variable-temperature foaming as described in claim 1, characterized in that, The composite retarder is composed of boric acid, citric acid and tartaric acid in a ratio of 1:1:

2.

4. The method for preparing prefabricated energy-saving insulation panels based on variable-temperature foaming as described in claim 1, characterized in that, The short-cut fibers are made of polypropylene or glass fiber and are 6-12mm in length.

5. The method for preparing prefabricated energy-saving insulation panels based on variable-temperature foaming as described in claim 1, characterized in that, The fineness of the first mixture is such that the residue on a 200-mesh square hole sieve is less than 10%.

6. The method for preparing prefabricated energy-saving insulation panels based on variable-temperature foaming as described in claim 1, characterized in that, The rotation speed of the slow stirring is 140±5 r / min.

7. The method for preparing prefabricated energy-saving insulation panels based on variable-temperature foaming as described in claim 1, characterized in that, The high-speed stirring speed is 280±10 r / min.

8. The application of the prefabricated energy-saving insulation board based on variable temperature foaming, prepared by the method of any one of claims 1-7, in the construction field.

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