Second-generation high-temperature-resistant waterproof heat-resisting sheet and preparation method thereof

Abstract

The invention relates to the technical field of characteristic layered products, in particular to a second-generation high-temperature-resistant waterproof heat-resisting sheet and a preparation method thereof.The preparation material comprises a heat-resisting sheet body, the heat-resisting sheet body comprises a base layer, the top of the base layer is fixedly connected with a first composite layer, and the top of the first composite layer is fixedly connected with a first fireproof layer; the top of the first fireproof layer is fixedly connected with a first hydrophobic layer, and the bottom of the base layer is fixedly connected with a second composite layer. According to the invention, a symmetric multi-layer composite structure is constructed through a step-by-step hot-pressing fixing process, a flame-retardant double-faced adhesive tape is used as a bonding medium, and a hydrophobic layer, a fireproof layer and a composite layer are sequentially subjected to hot-pressing densification layer by layer, so that the bonding strength between functional layers is enhanced, gaps are eliminated, layering and falling are prevented, a flame-retardant material forms a thermal resistance barrier, and thermal stress is dispersed through an internal and external symmetric structure; the integrity and functionality of the core structure can still be kept after the surface layer is abraded, and the stability of the whole structure is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of characteristic layered products, and in particular to a second-generation high-temperature resistant waterproof and heat-insulating sheet and its preparation method. Background Technology

[0002] The field of layered composite materials technology relates to sheet or plate-like products composed of multiple layers of materials. The core of this field lies in achieving specific functional attributes in the final product through the layering and structural design of different materials. This technology systematically encompasses composite laminate structures of various materials such as polymers, fibers, metals, or ceramics, focusing on achieving comprehensive functional characteristics such as thermal insulation, waterproofing, high-temperature resistance, or specific electrical properties, rather than solely focusing on a single material. Traditional second-generation high-temperature resistant waterproof thermal insulation sheets refer to a type of multi-layered composite sheet designed to achieve heat resistance, water resistance, and heat insulation. The technical challenge addressed by this type of sheet is maintaining structural stability and thermal barrier performance simultaneously in high-temperature and humid environments. Traditional solutions typically employ a multi-layered physical composite approach, such as using fiberglass mat, aluminum silicate fiber, or aerogel mat as the core insulation layer, and then bonding a polyimide film, aluminum foil, or waterproof coating with an adhesive as the surface layer to respectively perform the functions of thermal insulation and waterproofing.

[0003] Existing technologies typically employ simple physical stacking composite methods when constructing high-temperature resistant, waterproof, and heat-insulating structures. They primarily rely on ordinary adhesives to connect the heat-insulating core material to the surface waterproof membrane. This basic laminated structure is highly susceptible to adhesive aging and failure under extreme high-temperature and high-humidity environments, leading to a significant decrease in interlayer bonding strength and causing delamination. Furthermore, such products often rely solely on a single surface film to provide waterproofing and flame retardancy. Once the surface is subjected to mechanical damage or thermal stress cracking, the internal structure is directly exposed to the external environment, causing the overall heat insulation and protection performance to rapidly decline. This makes it difficult to maintain long-term structural stability and provide durable and reliable flame retardancy and hydrophobic protection. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and propose a second-generation high-temperature resistant waterproof heat insulation sheet and its preparation method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a second-generation high-temperature resistant waterproof heat insulation sheet, comprising a heat insulation sheet body, the heat insulation sheet body comprising a base layer, a first composite layer fixedly connected to the top of the base layer, a first fireproof layer fixedly connected to the top of the first composite layer, and a first hydrophobic layer fixedly connected to the top of the first fireproof layer. The base layer is fixedly connected to the bottom of a second composite layer, the second composite layer is fixedly connected to the bottom of a second fireproof layer, and the second fireproof layer is fixedly connected to the bottom of a second hydrophobic layer.

[0006] As a further embodiment of the present invention, the first composite layer includes a high-temperature resistant layer, a heat insulation layer, and a flame-retardant layer, wherein the heat insulation layer is fixed on top of the high-temperature resistant layer, and the flame-retardant layer is fixed on top of the heat insulation layer.

[0007] As a further embodiment of the present invention, the first composite layer, the first fireproof layer, the first hydrophobic layer, the second composite layer, the second fireproof layer, and the second hydrophobic layer are all formed by hot pressing with flame-retardant double-sided adhesive, and the first composite layer, the first fireproof layer, the first hydrophobic layer, the second composite layer, the second fireproof layer, and the second hydrophobic layer are an integral structure.

[0008] A method for preparing a second-generation high-temperature resistant waterproof and heat-insulating sheet, the method being performed based on the aforementioned second-generation high-temperature resistant waterproof and heat-insulating sheet, comprising the following steps: S1: Prepare the top component, obtain the first composite layer, the first fireproof layer and the first hydrophobic layer, fix the first fireproof layer to the top of the first composite layer by hot pressing with flame-retardant double-sided adhesive, and then fix the first hydrophobic layer to the top of the first fireproof layer by hot pressing with the flame-retardant double-sided adhesive to obtain the top component. S2: Prepare the bottom component, obtain the second composite layer, the second fireproof layer and the second hydrophobic layer, fix the second fireproof layer to the bottom of the second composite layer by hot pressing with flame-retardant double-sided adhesive, and then fix the second hydrophobic layer to the bottom of the second fireproof layer by hot pressing with the flame-retardant double-sided adhesive to obtain the bottom component; S3: Composite assembly, obtaining the base layer, hot-pressing the top component to the top of the base layer with flame-retardant double-sided adhesive, and simultaneously hot-pressing the bottom component to the bottom of the base layer with the same flame-retardant double-sided adhesive, to obtain a second-generation high-temperature resistant waterproof and heat-insulating sheet.

[0009] As a further aspect of the present invention, the step of preparing the top-level component in S1 specifically includes: S11: Obtain a high-temperature resistant layer, a heat insulation layer, and a flame-retardant layer. Use a first flame-retardant double-sided adhesive to hot-press and fix the heat insulation layer to the top of the high-temperature resistant layer. Then use a second flame-retardant double-sided adhesive to hot-press and fix the flame-retardant layer to the top of the heat insulation layer to obtain a first composite layer. S12: Obtain the first fireproof layer, and use the third flame-retardant double-sided adhesive to hot-press and fix the first fireproof layer to the top of the flame-retardant layer of the first composite layer; S13: Obtain the first hydrophobic layer, and use the fourth flame-retardant double-sided adhesive to hot-press and fix the first hydrophobic layer to the top of the first fireproof layer to obtain the top layer component.

[0010] As a further aspect of the present invention, the step of preparing the underlying component in S2 specifically includes: S21: Obtain the second composite layer, the second fireproof layer, and the second hydrophobic layer; S22: The second fireproof layer is aligned and hot-pressed to the bottom of the second composite layer using the fifth flame-retardant double-sided adhesive; S22: The second fireproof layer is aligned and hot-pressed to the bottom of the second composite layer using the fifth flame-retardant double-sided adhesive; S23: The second hydrophobic layer is aligned and hot-pressed to the bottom of the second fireproof layer using the sixth flame-retardant double-sided adhesive, ensuring that the edges of each layer are aligned, to obtain the bottom component.

[0011] As a further aspect of the present invention, the steps of the composite assembly in S3 specifically include: S31: Obtain the base layer, the top layer component, the bottom layer component, the seventh flame-retardant double-sided adhesive, and the eighth flame-retardant double-sided adhesive; S32: Positioning and bonding: Place the seventh flame-retardant double-sided adhesive on the top of the base layer, align and bond the top layer component to the seventh flame-retardant double-sided adhesive, place the eighth flame-retardant double-sided adhesive on the bottom of the base layer, align and bond the bottom layer component to the eighth flame-retardant double-sided adhesive, forming a structure to be pressed together; S33: Hot pressing: The structure to be pressed is placed in a hot pressing device and pressed at a preset temperature. and preset pressure Hot pressing is performed below, and the holding time is... After cooling and demolding, the second-generation high-temperature resistant waterproof and heat-insulating sheet is obtained.

[0012] As a further aspect of the present invention, the preset temperature The value ranges from 150°C to 180°C; The preset pressure The value range is from 1.0 MPa to 2.5 MPa; The holding time The value range is from 15 minutes to 30 minutes.

[0013] As a further aspect of the present invention, the step of preparing the first composite layer in S11 specifically includes: S111: Obtain a high-temperature resistant layer substrate and a heat insulation layer substrate, and use the first flame-retardant double-sided adhesive to hot-press and fix the heat insulation layer substrate to the top of the high-temperature resistant layer substrate to form a composite base layer; S112: Preparation of flame-retardant slurry: Phosphorus-based flame retardant, nitrogen-based flame retardant, film-forming resin, and solvent are dispersed and mixed at high speed in a stirred tank according to a predetermined mass ratio. The mass ratio of the phosphorus-based flame retardant to the nitrogen-based flame retardant is... satisfy ,in This represents the quality of phosphorus-based flame retardants. This represents the quality of nitrogen-based flame retardants, and The value ranges from 1.5 to 3.5, resulting in a uniform and stable flame-retardant slurry; S113: Coating and curing: The flame-retardant slurry is uniformly coated onto the surface of the heat insulation layer substrate of the composite base layer using a scraping process. Then, it is placed in an oven for gradient temperature drying and high-temperature cross-linking curing treatment to form a dense flame-retardant layer on the top of the heat insulation layer substrate, thus obtaining the first composite layer.

[0014] As a further aspect of the present invention, the phosphorus-based flame retardant is microencapsulated red phosphorus, and the average particle size of the microencapsulated red phosphorus is 5 μm to 15 μm; The nitrogen-based flame retardant is melamine polyphosphate; The film-forming resin is an aqueous polyurethane emulsion, and the solid content of the aqueous polyurethane emulsion is... pass Calculation, where This represents the weight of the residue after drying. The original sample weight representing the waterborne polyurethane emulsion, and the solid content... The value ranges from 30% to 45%.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows: In this invention, a symmetrical multi-layer composite structure with a base layer as the core is constructed by using a step-by-step hot-pressing fixing process. Flame-retardant double-sided adhesive is used as the key bonding medium. The hot-pressing densification process is carried out layer by layer from the outside to the inside in a specific order from the hydrophobic layer to the fireproof layer and then to the composite layer. This progressive densification pressing method can significantly enhance the interfacial bonding strength between each functional layer, eliminate interlayer gaps and effectively prevent delamination and peeling under high temperature conditions. The flame-retardant adhesive material forms a continuous thermal barrier between the layers. Combined with the symmetrical internal and external structural layout, it effectively disperses thermal stress and ensures that the integrity and functionality of the internal core structure can be maintained even when the surface layer is locally worn, thereby achieving excellent overall structural stability. Attached Figure Description

[0016] Figure 1 This is a flowchart of the preparation method of the second-generation high-temperature resistant waterproof and heat-insulating sheet of the present invention; Figure 2 This is a flowchart illustrating the fabrication process of the top-level component of this invention. Figure 3 This is a flowchart illustrating the fabrication process of the underlying components of this invention. Figure 4 This is a flowchart of the composite assembly and hot pressing process of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the technical solutions of this invention and do not constitute a limitation on the scope of protection.

[0018] In the description of this invention, the process flow relationships or material and energy transfer paths indicated by terms such as "unit," "step," "equipment," "pipeline," "material flow," and "process parameters" are defined based on the process flow diagram or equipment structure diagram corresponding to the embodiments. This way of expression is only used to clearly illustrate the logical relationship between the elements in the technical solution, and not to limit the specific equipment connection method or physical layout. The term "multiple" includes two or more technical units, including but not limited to multiple reactors, pumps, valves, separation units, or detection instruments and other expandable elements. The specific number is determined according to specific process requirements or production scale and needs to be specifically stated.

[0019] Example 1 In this embodiment, the mass ratio of phosphorus-based flame retardant to nitrogen-based flame retardant The lower limit of its range is 1.5; the solid content of the waterborne polyurethane emulsion. The lower limit of its range was adopted as 30%; the average particle size of microencapsulated red phosphorus was adopted as the lower limit of its range as 5 μm; hot pressing temperature The lower limit of its range is 150°C; hot pressing pressure. The lower limit of its range is 1.0 MPa; hot pressing holding time The lower limit of its interval is used, which is 15 minutes.

[0020] Please see Figure 1 The present invention provides a technical solution: a second-generation high-temperature resistant waterproof and heat-insulating sheet, the second-generation high-temperature resistant waterproof and heat-insulating sheet includes a heat-insulating sheet body, the heat-insulating sheet body includes a base layer, a first composite layer is fixedly connected to the top of the base layer, a first fireproof layer is fixedly connected to the top of the first composite layer, a first hydrophobic layer is fixedly connected to the top of the first fireproof layer, a second composite layer is fixedly connected to the bottom of the base layer, a second fireproof layer is fixedly connected to the bottom of the second composite layer, and a second hydrophobic layer is fixedly connected to the bottom of the second fireproof layer.

[0021] The first composite layer includes a high-temperature resistant layer, a heat insulation layer, and a flame-retardant layer. The heat insulation layer is fixed on top of the high-temperature resistant layer, and the flame-retardant layer is fixed on top of the heat insulation layer.

[0022] The first composite layer, the first fireproof layer, the first hydrophobic layer, the second composite layer, the second fireproof layer, and the second hydrophobic layer are all formed by hot pressing with flame-retardant double-sided adhesive, and the first composite layer, the first fireproof layer, the first hydrophobic layer, the second composite layer, the second fireproof layer, and the second hydrophobic layer are a single integral structure.

[0023] Please see Figure 1 and Figure 2 A method for preparing a second-generation high-temperature resistant waterproof and heat-insulating sheet, wherein the method is based on the above-mentioned second-generation high-temperature resistant waterproof and heat-insulating sheet and includes the following steps: S1: Prepare the top component, obtain the first composite layer, the first fireproof layer and the first hydrophobic layer, fix the first fireproof layer to the top of the first composite layer by hot pressing with flame-retardant double-sided adhesive, and then fix the first hydrophobic layer to the top of the first fireproof layer by hot pressing with flame-retardant double-sided adhesive to obtain the top component. The specific steps for preparing the top-level component in S1 include: S11: Obtain a high-temperature resistant layer, a heat insulation layer and a flame retardant layer. Use a first flame retardant double-sided adhesive to hot-press and fix the heat insulation layer to the top of the high-temperature resistant layer, and then use a second flame retardant double-sided adhesive to hot-press and fix the flame retardant layer to the top of the heat insulation layer to obtain the first composite layer. The specific steps for preparing the first composite layer in S11 include: S111: Obtain the high-temperature resistant layer substrate and the heat insulation layer substrate, and use the first flame-retardant double-sided adhesive to hot-press and fix the heat insulation layer substrate to the top of the high-temperature resistant layer substrate to form a composite base layer. S112: Preparation of flame-retardant slurry: Phosphorus-based flame retardant, nitrogen-based flame retardant, film-forming resin, and solvent are dispersed and mixed at high speed in a stirred tank according to a predetermined mass ratio. The mass ratio of phosphorus-based flame retardant to nitrogen-based flame retardant is... satisfy ,in This represents the quality of phosphorus-based flame retardants. This represents the quality of nitrogen-based flame retardants, and The value ranges from 1.5 to 3.5, resulting in a uniform and stable flame-retardant slurry; The phosphorus-based flame retardant is microencapsulated red phosphorus; The average particle size of microencapsulated red phosphorus is 5 μm to 15 μm; The nitrogen-based flame retardant is melamine polyphosphate; The film-forming resin is an aqueous polyurethane emulsion; Solid content of waterborne polyurethane emulsion pass Calculation, where This represents the weight of the residue after drying. The original sample weight of the waterborne polyurethane emulsion, and its solid content. The value ranges from 30% to 45%; S113: Coating and curing: The flame-retardant slurry is uniformly coated onto the surface of the heat insulation layer substrate of the composite base layer using a scraping process. Then, it is placed in an oven for gradient temperature drying and high-temperature cross-linking curing treatment to form a dense flame-retardant layer on the top of the heat insulation layer substrate, thus obtaining the first composite layer. S12: Obtain the first fireproof layer and fix the first fireproof layer to the top of the flame-retardant layer of the first composite layer by hot pressing with the third flame-retardant double-sided adhesive. S13: Obtain the first hydrophobic layer, and use the fourth flame-retardant double-sided adhesive to hot-press and fix the first hydrophobic layer to the top of the first fireproof layer to obtain the top component.

[0024] Prepare 1mm thick aramid fiber paper as the high-temperature resistant layer substrate and 3mm thick aerogel felt as the heat insulation layer substrate. Cut both substrates to a 1m x 1m size. Take a 1m wide roll of first flame-retardant double-sided adhesive (acrylate adhesive system) and evenly apply it to the surface of the aramid fiber paper substrate. Then, align the aramid fiber paper with the double-sided adhesive and the aerogel felt, and place them in a flatbed hot press. Set the hot press temperature to 120°C and the pressure to 0.5MPa, hold the pressure for 5 minutes, and perform the initial pressing. After cooling, remove the substrate to obtain the composite base layer.

[0025] The aforementioned flame-retardant double-sided tape refers to a double-sided tape in which a flame retardant has been added to the adhesive system. When burning, the adhesive can inhibit the spread of flames or extinguish itself, thus providing bonding function without reducing the overall fire safety level of the composite material.

[0026] In a 100L stirred tank equipped with a cooling jacket and a high-speed dispersion paddle, 20.0 kg of deionized water was first added as a solvent. The stirring was started and set to 500 rpm. Then, 26.7 kg of melamine polyphosphate (a nitrogen-based flame retardant) was added. Slowly add the mixture to the mixing tank and stir continuously for 15 minutes to initially disperse it in the water. Then, add 40.0 kg of microencapsulated red phosphorus (a phosphorus-based flame retardant). The particles (with an average particle size of 5 μm) were added to the reactor in batches. During this process, cooling water was circulated through the jacket to strictly control the temperature inside the reactor below 40°C. After the addition was completed, the stirring speed was increased to 2000 rpm, and high-speed dispersion was carried out for 45 minutes.

[0027] Then, the rotation speed was reduced to 800 rpm, and 55.6 kg of a waterborne polyurethane emulsion (film-forming resin) with a solid content of 30% was slowly pumped in. Validation was performed before feeding as follows: Accurately weigh 10.00 g of the aqueous polyurethane emulsion sample into a pre-weighed petri dish, place it in an oven at 105°C and dry to constant weight (approximately 2 hours). After drying, cool to room temperature in a desiccator and weigh. The weight of the residue after drying was recorded. The original sample weight was 3.00g. It is 10.00g, calculated using the formula: ; Confirm that the solid content meets the requirements. After the emulsion is completely added, continue stirring for 30 minutes to obtain the flame-retardant slurry. The viscosity of the slurry was measured at 25°C using an NDJ-8S rotational viscometer, and the value was 3500 mPa·s.

[0028] Based on the above feed amounts, the mass ratio of phosphorus-based flame retardants to nitrogen-based flame retardants... The calculations were performed. This included the mass of phosphorus-based flame retardants. The mass of nitrogen-based flame retardant is 40.0 kg. It weighs 26.7 kg. According to the formula... Calculations yielded The ratio is 1.5.

[0029] The aforementioned melamine polyphosphate is a nitrogen-phosphorus synergistic intumescent halogen-free flame retardant. When heated, it decomposes to produce phosphoric acid and melamine. The phosphoric acid catalyzes the dehydration and carbonization of the substrate to form a carbon layer, while the non-flammable gas (such as ammonia) produced by the decomposition of melamine can dilute the concentration of flammable gas and carry away heat, thereby achieving the flame retardant effect of heat insulation and air isolation.

[0030] The aforementioned microencapsulated red phosphorus refers to red phosphorus particles coated with one or more dense protective shells (such as melamine-formaldehyde resin, aluminum hydroxide, etc.) through physical or chemical methods. This shell can effectively isolate red phosphorus from contact with the external environment, solving the problems of ordinary red phosphorus being prone to moisture absorption, oxidation, dust explosion during processing, and poor compatibility with polymer substrates, while retaining its highly efficient phosphorus-based flame retardant properties.

[0031] The composite substrate prepared in step S111 is fixed on the unwinding shaft of a doctor blade coater, with the surface of the insulation layer substrate (aerogel felt) facing upwards. The gap between the coating doctor blade and the substrate surface is set to 0.5 mm. The coater is started, and the flame-retardant slurry prepared in step S112 is pumped into the feed tank for continuous coating at a linear speed of 10 m / min. The coated wet film enters a three-temperature-zone tunnel oven along with the substrate. The first temperature zone is set at 80°C for 5 minutes to evaporate moisture; the second temperature zone is set at 110°C for 5 minutes to further dry and initiate resin crosslinking; the third temperature zone is set at 140°C for 10 minutes to complete the crosslinking and curing process. After drying and curing, a uniform and dense flame-retardant layer is formed on the top of the insulation layer substrate. The resulting product is wound up on a take-up shaft, forming the first composite layer.

[0032] The first composite layer roll material obtained in the previous step is placed again on the laminating equipment. A 0.2mm thick, 1m wide alkali-free fiberglass cloth is prepared as the first fireproof layer. A third flame-retardant double-sided adhesive (release paper type) is applied to the entire surface of the alkali-free fiberglass cloth using a pressure roller. Then, the fiberglass cloth with the adhesive tape is aligned and bonded to the surface of the flame-retardant layer of the first composite layer, and pressed together using a hot press roller. The hot press roller temperature is set to 140°C, and the linear speed is 5m / min.

[0033] A 50 μm thick polytetrafluoroethylene (PTFE) microporous membrane, treated with plasma C4F8 gas deposition, is prepared as the first hydrophobic layer. A fourth flame-retardant double-sided adhesive is then applied to one side of the PTFE membrane using a similar process to that described above. Subsequently, this PTFE membrane is aligned and bonded to the surface of the glass fiber cloth (first fire-resistant layer) from step S12, and pressed together using hot rollers with the same parameters as in step S12. The final product obtained by winding is the top layer assembly.

[0034] Please see Figure 1 and Figure 3 S2: Prepare the bottom component, obtain the second composite layer, the second fireproof layer and the second hydrophobic layer, fix the second fireproof layer to the bottom of the second composite layer by hot pressing with flame-retardant double-sided adhesive, and then fix the second hydrophobic layer to the bottom of the second fireproof layer by hot pressing with flame-retardant double-sided adhesive to obtain the bottom component. The specific steps for preparing the underlying components in S2 include: S21: Obtain the second composite layer, the second fireproof layer, and the second hydrophobic layer; S22: The second fireproof layer is aligned and hot-pressed to the bottom of the second composite layer using the fifth flame-retardant double-sided adhesive. S23: The second hydrophobic layer is aligned and hot-pressed to the bottom of the second fireproof layer using the sixth flame-retardant double-sided adhesive, ensuring that the edges of each layer are aligned to obtain the bottom component.

[0035] Obtain a second composite layer, a second fire-resistant layer, and a second hydrophobic layer. The preparation method and material specifications of the second composite layer are exactly the same as those for the first composite layer described in step S11. The second fire-resistant layer uses the same alkali-free glass fiber cloth as in step S12. The second hydrophobic layer uses the same PTFE microporous membrane as in step S13.

[0036] Apply the fifth flame-retardant double-sided adhesive to one surface of the second fireproof layer (alkali-free fiberglass cloth). Place the second composite layer on the workbench with its bottom (the side with the aramid fiber paper substrate of the high-temperature resistant layer) facing upwards. Precisely align the second fireproof layer with the tape to the bottom surface of the second composite layer, using a CCD vision alignment system to ensure alignment error is within ±0.2mm. Press and fix using a hot press roller.

[0037] The sixth flame-retardant double-sided adhesive is applied to one surface of the second hydrophobic layer (PTFE microporous membrane). The semi-finished product obtained in step S22 is placed on a workbench with the second fire-retardant layer surface facing upwards. Using a CCD vision alignment system, the second hydrophobic layer with the adhesive tape is precisely aligned with the surface of the second fire-retardant layer. After edge alignment, it is pressed together using a hot press roller. The final product is the bottom component.

[0038] Please see Figure 1 and Figure 4 S3: Composite assembly, obtain the base layer, and use flame-retardant double-sided adhesive to hot-press the top component to the top of the base layer, and at the same time use flame-retardant double-sided adhesive to hot-press the bottom component to the bottom of the base layer, to obtain the second-generation high-temperature resistant waterproof and heat-insulating sheet. The specific steps involved in the composite assembly in S3 include: S31: Obtain the base layer, top layer component, bottom layer component, seventh flame-retardant double-sided adhesive and eighth flame-retardant double-sided adhesive; S32: Positioning and bonding: Place the seventh flame-retardant double-sided adhesive on the top of the base layer, align and bond the top layer component to the seventh flame-retardant double-sided adhesive, place the eighth flame-retardant double-sided adhesive on the bottom of the base layer, align and bond the bottom layer component to the eighth flame-retardant double-sided adhesive, forming the structure to be pressed. S33: Hot pressing, placing the structure to be pressed in a hot press equipment, and pressing at a preset temperature. and preset pressure Hot pressing is performed below, and the holding time is... After cooling and demolding, the second-generation high-temperature resistant waterproof heat insulation sheet is obtained; preset temperature The value ranges from 150°C to 180°C; Preset pressure The value range is from 1.0 MPa to 2.5 MPa; Duration The value range is from 15 minutes to 30 minutes.

[0039] Obtain a 5mm thick aramid paper honeycomb core (4mm side length of the cell) as the base layer and cut it into 1m×1m size. Prepare the top layer component obtained in step S1, the bottom layer component obtained in step S2, and the cut seventh and eighth flame-retardant double-sided tapes (all in 1m×1m sheets).

[0040] On the horizontal assembly table, first lay the aramid paper honeycomb base layer flat. Lay the seventh flame-retardant double-sided adhesive on top of the base layer and remove the release paper. Then, precisely align and attach the top layer component (its bottom being the high-temperature resistant layer) onto the seventh flame-retardant double-sided adhesive. Flip the entire structure 180 degrees. Lay the eighth flame-retardant double-sided adhesive on the other side of the base layer (i.e., the current top) and remove the release paper. Finally, precisely align and attach the bottom layer component (its top being the second composite layer) onto the eighth flame-retardant double-sided adhesive. During alignment, a laser edge detector is used to ensure that the maximum misalignment of the edges of all layers does not exceed 0.5mm. This structure is the one to be pressed together.

[0041] Carefully move the structure to be pressed onto the lower platen of the large flatbed hot press. Start the equipment and set the hot pressing temperature. 150°C, preset pressure The pressure is 1.0 MPa. After the compressor closes, the program starts timing and maintains this temperature and pressure for 15 minutes (i.e., =15 minutes). After the pressure holding period, the system automatically switches to the cooling program, using circulating cooling water inside the pressure plate to lower the mold temperature to below 60°C. Then, the pressure is released, the press is opened, and the finished product is removed. The resulting product is the final second-generation high-temperature resistant waterproof and heat-insulating sheet. After edge trimming and surface cleaning, the finished product is inspected and put into storage.

[0042] Table 1: Performance Comparison of Products in Example 1

[0043] In the table above, conventional aluminum silicate fiber insulation sheets are marked as "not applicable" in the vertical flammability rating (UL-94) item. This usually means that when the material is tested according to the UL-94 standard, its flammability behavior (such as the duration of continuous flaming burning, whether the molten droplets ignite the degreased cotton, etc.) does not meet the evaluation criteria of any valid rating (such as V-0, V-1 or V-2), or its material properties (such as inorganic fiber felt) are not suitable for the flammability test method of this plastic material.

[0044] As shown in Table 1, the second-generation high-temperature resistant waterproof insulation sheet prepared in this embodiment shows performance improvements over existing conventional insulation materials in terms of thermal conductivity, flame retardancy, hydrophobicity, structural strength, and lightweight.

[0045] Example 2 In this embodiment, the mass ratio of phosphorus-based flame retardant to nitrogen-based flame retardant The upper limit of its range, 3.5, is adopted; the solid content of the waterborne polyurethane emulsion. The upper limit of its range, i.e., 45%, is adopted; the average particle size of microencapsulated red phosphorus is adopted as the upper limit of its range, i.e., 15 μm; hot pressing temperature. Use its upper limit value, i.e., 180°C; hot pressing pressure The upper limit of its range is adopted, namely 2.5 MPa; hot pressing holding time Use its upper limit of the interval, which is 30 minutes.

[0046] Please see Figure 1 The present invention provides a technical solution: a second-generation high-temperature resistant waterproof and heat-insulating sheet, the second-generation high-temperature resistant waterproof and heat-insulating sheet includes a heat-insulating sheet body, the heat-insulating sheet body includes a base layer, a first composite layer is fixedly connected to the top of the base layer, a first fireproof layer is fixedly connected to the top of the first composite layer, a first hydrophobic layer is fixedly connected to the top of the first fireproof layer, a second composite layer is fixedly connected to the bottom of the base layer, a second fireproof layer is fixedly connected to the bottom of the second composite layer, and a second hydrophobic layer is fixedly connected to the bottom of the second fireproof layer.

[0047] The first composite layer includes a high-temperature resistant layer, a heat insulation layer, and a flame-retardant layer. The heat insulation layer is fixed on top of the high-temperature resistant layer, and the flame-retardant layer is fixed on top of the heat insulation layer.

[0048] The first composite layer, the first fireproof layer, the first hydrophobic layer, the second composite layer, the second fireproof layer, and the second hydrophobic layer are all formed by hot pressing with flame-retardant double-sided adhesive, and the first composite layer, the first fireproof layer, the first hydrophobic layer, the second composite layer, the second fireproof layer, and the second hydrophobic layer are a single integral structure.

[0049] Please see Figure 1 and Figure 2 A method for preparing a second-generation high-temperature resistant waterproof and heat-insulating sheet, wherein the method is based on the above-mentioned second-generation high-temperature resistant waterproof and heat-insulating sheet and includes the following steps: S1: Prepare the top component, obtain the first composite layer, the first fireproof layer and the first hydrophobic layer, fix the first fireproof layer to the top of the first composite layer by hot pressing with flame-retardant double-sided adhesive, and then fix the first hydrophobic layer to the top of the first fireproof layer by hot pressing with flame-retardant double-sided adhesive to obtain the top component. The specific steps for preparing the top-level component in S1 include: S11: Obtain a high-temperature resistant layer, a heat insulation layer and a flame retardant layer. Use a first flame retardant double-sided adhesive to hot-press and fix the heat insulation layer to the top of the high-temperature resistant layer, and then use a second flame retardant double-sided adhesive to hot-press and fix the flame retardant layer to the top of the heat insulation layer to obtain the first composite layer. The specific steps for preparing the first composite layer in S11 include: S111: Obtain the high-temperature resistant layer substrate and the heat insulation layer substrate, and use the first flame-retardant double-sided adhesive to hot-press and fix the heat insulation layer substrate to the top of the high-temperature resistant layer substrate to form a composite base layer. S112: Preparation of flame-retardant slurry: Phosphorus-based flame retardant, nitrogen-based flame retardant, film-forming resin, and solvent are dispersed and mixed at high speed in a stirred tank according to a predetermined mass ratio. The mass ratio of phosphorus-based flame retardant to nitrogen-based flame retardant is... satisfy ,in This represents the quality of phosphorus-based flame retardants. This represents the quality of nitrogen-based flame retardants, and The value ranges from 1.5 to 3.5, resulting in a uniform and stable flame-retardant slurry; The phosphorus-based flame retardant is microencapsulated red phosphorus; The average particle size of microencapsulated red phosphorus is 5 μm to 15 μm; The nitrogen-based flame retardant is melamine polyphosphate; The film-forming resin is an aqueous polyurethane emulsion; Solid content of waterborne polyurethane emulsion pass Calculation, where This represents the weight of the residue after drying. The original sample weight of the waterborne polyurethane emulsion, and its solid content. The value ranges from 30% to 45%; S113: Coating and curing: The flame-retardant slurry is uniformly coated onto the surface of the heat insulation layer substrate of the composite base layer using a scraping process. Then, it is placed in an oven for gradient temperature drying and high-temperature cross-linking curing treatment to form a dense flame-retardant layer on the top of the heat insulation layer substrate, thus obtaining the first composite layer. S12: Obtain the first fireproof layer and fix the first fireproof layer to the top of the flame-retardant layer of the first composite layer by hot pressing with the third flame-retardant double-sided adhesive. S13: Obtain the first hydrophobic layer, and use the fourth flame-retardant double-sided adhesive to hot-press and fix the first hydrophobic layer to the top of the first fireproof layer to obtain the top component.

[0050] First, two rolls of material are prepared: one roll of aramid fiber paper, 1mm thick and 1m wide, to be used as the high-temperature resistant layer substrate; the other roll of aerogel felt, 3mm thick and 1m wide, to be used as the heat insulation layer substrate. In the cutting process, a high-precision CNC cutting machine is used to precisely cut both substrates into 1m x 1m squares. Next, the operator uses an automatic laminator to evenly and without bubbles apply a 1m wide, 0.1mm thick roll of flame-retardant double-sided adhesive (model A-200, with an acrylic adhesive system and a shear strength of 20N / cm) to the entire surface of the aramid fiber paper substrate. This ensures tight contact between the adhesive layer and the substrate, without wrinkles or detachment. Then, the operator precisely aligns the aramid fiber paper substrate with the double-sided adhesive on a positioning platform with the pre-prepared aerogel felt substrate.

[0051] During alignment, an infrared laser alignment system is used to ensure that the edge deviation between the two substrates does not exceed ±0.1mm. After alignment, the laminated structure is smoothly fed into a flatbed hot press equipped with a precise temperature control system. The operating parameters of the hot press are set as follows: platen temperature 120°C, pressing pressure 0.5MPa, and holding time 5 minutes. The main purpose of this stage of pressing is to achieve preliminary interlayer curing and remove interlayer air, avoiding delamination or bubbling in subsequent operations. After pressing, once the flatbed hot press has cooled to room temperature, the laminated substrate is carefully removed. At this point, a preliminary composite base layer is obtained, with a smooth surface and no obvious delamination between the layers.

[0052] In a 100L jacketed stirred tank equipped with magnetic stirring and wall scraping devices and precise temperature control, 20.0 kg of deionized water was first precisely measured and added. The stirring device was started, and the impeller speed was set to 500 rpm to ensure a stable vortex was formed in the liquid inside the tank. Subsequently, 26.7 kg of melamine polyphosphate (nitrogen-based flame retardant, commercial brand name MPPE-200, average particle size 5 μm) was weighed and slowly and evenly added to the stirred tank through a weighing feeder to avoid powder agglomeration. Stirring was continued for 15 minutes to allow the melamine polyphosphate to be fully wetted and initially dispersed in the deionized water. Next, 93.45 kg of microencapsulated red phosphorus (phosphorus flame retardant, commercial brand name MRP-15, with an average particle size set at 15 μm, which was detected by a laser particle size analyzer and ranged from 10 μm to 20 μm) was accurately weighed and added to the reactor in eight batches, each batch weighing approximately 11.7 kg, with a 3-minute interval between each batch.

[0053] During the addition of microencapsulated red phosphorus, chilled brine was circulated through the jacket to strictly control the material temperature inside the reactor at 38°C, ensuring that the flame retardant would not degrade due to frictional heat during dispersion. After all solid powder was added, the stirring speed was increased to 2000 rpm for high-speed dispersion for 45 minutes to ensure that powder agglomerates were completely broken up and a uniform suspension was formed. After dispersion, the stirring speed was reduced to 800 rpm. 55.6 kg of a 45% solids content aqueous polyurethane emulsion (film-forming resin, commercial brand WPU-500, viscosity at 25°C 8000 mPa·s) was slowly pumped into the stirred tank at a rate of 5 kg / min using a peristaltic pump. Before feeding, the solids content of this batch of aqueous polyurethane emulsion was... Verification was performed: 10.00 g of the emulsion sample was accurately weighed and placed in a pre-weighed aluminum foil tray, then baked in a 105°C oven for 2 hours until constant weight. The weight of the residue after drying was recorded. The measured weight was 4.50g, the original sample weight of the emulsion. It is 10.00g. According to the formula... Calculations yielded This result meets the requirements of this embodiment by 45%. After the emulsion is added, continue stirring at 800 rpm for 30 minutes to ensure that all components are mixed evenly, finally obtaining a uniform and stable flame-retardant slurry. After stirring, the slurry viscosity was measured at 25°C using an NDJ-8S rotational viscometer, and the value was 4200 mPa·s.

[0054] Based on the above feed amounts, the mass ratio of phosphorus-based flame retardants to nitrogen-based flame retardants... The calculations were performed. This included the mass of phosphorus-based flame retardants. The mass of the nitrogen-based flame retardant is 93.45 kg. It weighs 26.7 kg. According to the formula... Calculations yielded The ratio result is 3.5, which is consistent with the preset upper limit.

[0055] The composite substrate prepared in step S111 is fixed to the unwinding shaft of the doctor blade coater using a precise tension control system, ensuring that the surface of the insulation substrate (aerogel felt) faces upwards. The doctor blade gap of the coater is set to 0.5 mm, which is calibrated using a high-precision micrometer to ensure consistent coating thickness. The coating equipment is started, and the flame-retardant slurry prepared in step S112 is precisely and constantly pumped into the coating tank using a diaphragm pump. The coater performs a continuous and uniform coating operation at a linear speed of 10 m / min, ensuring that the slurry forms a uniform wet film on the substrate surface.

[0056] After the wet film coating is completed, the composite substrate, along with the wet film, is immediately placed in a tunnel-type drying oven with three independently temperature-controlled zones. The first zone is set at 80°C for 5 minutes, primarily to gently evaporate most of the moisture in the slurry and prevent surface skinning. The second zone is set at 110°C for 5 minutes to further dry residual moisture and initiate the cross-linking reaction of the film-forming resin in the waterborne polyurethane emulsion. The third zone is set at 140°C for 10 minutes to thoroughly complete the resin cross-linking and curing process, forming a highly dense flame-retardant layer. The temperature of each zone is precisely controlled by a PID controller, monitored and recorded in real time to ensure temperature fluctuations are within ±2°C. After this precisely controlled drying and curing process, a uniformly thick, smooth, dense, and strongly adhesive flame-retardant layer is formed on top of the insulation substrate. The final product is then neatly wound into a roll using an automatic winding device; this roll constitutes the first composite layer.

[0057] The first composite layer obtained in step S113 is installed onto the unwinding station of the continuous laminating equipment. Simultaneously, a roll of fireproof cloth with a thickness of 0.2 mm, a width of 1 m, and woven from high-strength alkali-free glass fiber is prepared (as the first fireproof layer, weight 200 g / m², tensile strength 500 N / 5 cm). A third flame-retardant double-sided adhesive (high-viscosity PET-based double-sided adhesive, model B-300, initial viscosity 25 N / inch) is applied smoothly and bubble-free to one surface of the fireproof cloth using a roller pressing method, and the release film is removed. Subsequently, in an automatic alignment system, the fireproof cloth and the flame-retardant layer surface of the first composite layer are precisely aligned, ensuring that the transverse and longitudinal alignment accuracy of the two layers is within ±0.15 mm. Pressing is performed using a combination of heated rollers and pressure rollers. The surface temperature of the heated rollers is precisely controlled at 140°C, the pressing line speed is set to 5 m / min, and the pressing pressure is set to 0.8 MPa. This pressing process ensures the melting and flow of the double-sided adhesive, thereby achieving a tight bond between the first fireproof layer and the first composite layer.

[0058] The semi-finished roll material obtained in step S12 (containing the first composite layer and the first fireproof layer) is fed into the next continuous lamination station. A roll of polytetrafluoroethylene (PTFE) microporous membrane with a thickness of 50 μm and a width of 1 m, treated with plasma C4F8 gas deposition, is prepared as the first hydrophobic layer, achieving a surface contact angle of over 150°. A fourth flame-retardant double-sided adhesive (the same type as the third flame-retardant double-sided adhesive) is applied to one surface of the PTFE microporous membrane, and the release film is removed. Using a high-precision robotic arm and vision recognition system, the PTFE microporous membrane is precisely aligned with the surface of the glass fiber cloth (first fireproof layer) produced in step S12, ensuring an edge alignment accuracy within ±0.1 mm. Hot pressing is performed using the same combination of heated rollers and pressure rollers as in step S12, with a heated roller temperature of 140°C, a linear speed of 5 m / min, and a pressing pressure of 0.8 MPa. This precisely controlled hot pressing ensures a strong bond between the first hydrophobic layer and the underlying material, forming a complete and waterproof top layer component. Finally, the resulting top-level component is rolled up.

[0059] The aforementioned plasma C4F8 gas deposition treatment is a surface modification technology. In a vacuum environment, C4F8 (octafluorocyclobutane) gas is excited into a plasma state using radio frequency or microwave energy. The highly active fluorine-containing groups undergo deposition and polymerization reactions on the surface of the PTFE microporous membrane, forming a nanoscale hydrophobic film similar to polytetrafluoroethylene. This film can significantly enhance the hydrophobic properties of the material surface, making it reach a superhydrophobic state.

[0060] Please see Figure 1 and Figure 3S2: Prepare the bottom component, obtain the second composite layer, the second fireproof layer and the second hydrophobic layer, fix the second fireproof layer to the bottom of the second composite layer by hot pressing with flame-retardant double-sided adhesive, and then fix the second hydrophobic layer to the bottom of the second fireproof layer by hot pressing with flame-retardant double-sided adhesive to obtain the bottom component. The specific steps for preparing the underlying components in S2 include: S21: Obtain the second composite layer, the second fireproof layer, and the second hydrophobic layer; S22: The second fireproof layer is aligned and hot-pressed to the bottom of the second composite layer using the fifth flame-retardant double-sided adhesive. S23: The second hydrophobic layer is aligned and hot-pressed to the bottom of the second fireproof layer using the sixth flame-retardant double-sided adhesive, ensuring that the edges of each layer are aligned to obtain the bottom component.

[0061] First, a second composite layer, a second fire-resistant layer, and a second hydrophobic layer are obtained. The preparation method, material specifications (e.g., thickness and dimensions of the aramid fiber paper and aerogel mat), and stacking order of the layers in the second composite layer are completely consistent with those of the first composite layer described in step S11, ensuring symmetry between the upper and lower surfaces. The second fire-resistant layer uses the exact same batch and specifications of the alkali-free glass fiber cloth used in step S12. The second hydrophobic layer also uses the exact same batch and specifications of the PTFE microporous membrane used in step S13. All materials undergo rigorous quality checks before proceeding to steps S22 and S23, including checks for dimensions, surface defects, basis weight, and flame retardant properties.

[0062] The fifth flame-retardant double-sided adhesive (the same model as the aforementioned double-sided adhesive) is precisely applied to one surface of the second fireproof layer (alkali-free fiberglass cloth) using an automated laminating device. The operator places the prepared second composite layer (its bottom side, i.e., the side with the aramid fiber paper) stably on a precision alignment platform, bottom surface facing upwards. Subsequently, the second fireproof layer with the double-sided adhesive is precisely positioned using a high-precision electric slide and a CCD vision alignment system. The vision system captures the edge features of the two layers in real time, calculating and compensating for any minute deviations to ensure that the second fireproof layer is precisely aligned with the bottom of the second composite layer both laterally and longitudinally, keeping the alignment error within a minimal range of ±0.2mm. After alignment, continuous pressing is performed using a set of opposing hot press rollers. The surface temperature of the hot press rollers is set to 130°C, the linear speed to 5m / min, and the pressing pressure to 0.7MPa. This process aims to activate the adhesive properties of the double-sided adhesive, achieving a strong bond between the second fireproof layer and the second composite layer.

[0063] The sixth flame-retardant double-sided adhesive (the same type as the aforementioned double-sided adhesive) is precisely adhered to one surface of the second hydrophobic layer (PTFE microporous membrane) using an automated film-applying device. The semi-finished product obtained in step S22 (which already includes the second composite layer and the second fire-retardant layer) is placed on another alignment platform with the second fire-retardant layer facing upwards. Similarly, using a CCD vision alignment system, the second hydrophobic layer with the double-sided adhesive is precisely aligned with the surface of the second fire-retardant layer. This system monitors and adjusts in real time to ensure that the edge alignment error of each layer does not exceed ±0.15mm.

[0064] After ensuring precise alignment, continuous pressing is performed using another set of opposing hot press rollers. The surface temperature of the heated rollers is set at 130°C, the linear speed at 5 m / min, and the pressing pressure at 0.7 MPa. This operation further strengthens the adhesion between the layers and ensures that the second hydrophobic layer can fully exert its waterproof performance. Finally, after a complete alignment and pressing process, the finished product is the bottom layer component, whose layers are structurally intact and edge-aligned.

[0065] Please see Figure 1 and Figure 4 S3: Composite assembly, obtain the base layer, and use flame-retardant double-sided adhesive to hot-press the top component to the top of the base layer, and at the same time use flame-retardant double-sided adhesive to hot-press the bottom component to the bottom of the base layer, to obtain the second-generation high-temperature resistant waterproof and heat-insulating sheet. The specific steps involved in the composite assembly in S3 include: S31: Obtain the base layer, top layer component, bottom layer component, seventh flame-retardant double-sided adhesive and eighth flame-retardant double-sided adhesive; S32: Positioning and bonding: Place the seventh flame-retardant double-sided adhesive on the top of the base layer, align and bond the top layer component to the seventh flame-retardant double-sided adhesive, place the eighth flame-retardant double-sided adhesive on the bottom of the base layer, align and bond the bottom layer component to the eighth flame-retardant double-sided adhesive, forming the structure to be pressed. S33: Hot pressing, placing the structure to be pressed in a hot press equipment, and pressing at a preset temperature. and preset pressure Hot pressing is performed below, and the holding time is... After cooling and demolding, the second-generation high-temperature resistant waterproof heat insulation sheet is obtained; preset temperature The value ranges from 150°C to 180°C; Preset pressure The value range is from 1.0 MPa to 2.5 MPa; Duration The value range is from 15 minutes to 30 minutes.

[0066] First, accurately obtain the aramid paper honeycomb core as the base layer, with a thickness of 5mm, a cell side length of 4mm, and a density of 48kg / m³. This honeycomb core has been pre-dried to ensure a moisture content of less than 1%. Cut to a size of 1m × 1m. Simultaneously, prepare the top layer component (1m × 1m) obtained in step S1, and the bottom layer component (1m × 1m) obtained in step S2. Furthermore, prepare two pieces of 1m × 1m seventh and eighth flame-retardant double-sided adhesive tape (the same type as the aforementioned double-sided adhesive tapes, both high-viscosity PET-based double-sided adhesives), ensuring their release paper remains intact to prevent premature adhesion.

[0067] In a Class 10,000 cleanroom assembly workshop, operators first place the aramid paper honeycomb base layer stably on a high-precision automated assembly platform. This platform is equipped with a vacuum adsorption device to ensure the base layer remains stationary during subsequent operations. Next, the release paper of the seventh flame-retardant double-sided adhesive is peeled off and precisely laid flat on the entire top surface of the base layer, ensuring no air bubbles or wrinkles. Using an automated robotic arm and machine vision system, the top layer component (with a high-temperature resistant layer at its bottom) is precisely aligned onto the seventh flame-retardant double-sided adhesive. The alignment accuracy is controlled within ±0.2mm. After completion, the system automatically rotates the entire structure to be pressed 180 degrees, so that the original base layer bottom is facing upwards. The release paper of the eighth flame-retardant double-sided adhesive is peeled off and laid flat on the other surface of the base layer. Finally, again using an automated robotic arm and machine vision system, the bottom layer component (with a second composite layer at its top) is precisely aligned onto the eighth flame-retardant double-sided adhesive. This stage also strictly controls the alignment accuracy within ±0.2mm, ensuring overall alignment of the edges of each layer. At this point, a complete structure to be pressed is formed, consisting of a base layer, double-sided adhesive, and top and bottom layer components.

[0068] The assembled structure, completed in step S32, is smoothly fed into the center of the lower platen of a large hydraulic flatbed hot press via an automated conveyor system. The hot press is started, and the preset hot pressing cycle begins. The hot press's temperature control system precisely raises the platen temperature to 180°C, a temperature monitored in real-time by multiple thermocouples to ensure uniformity. Simultaneously, the hydraulic system gradually applies pressure to 2.5 MPa. After reaching the preset temperature and pressure, the hot press maintains these conditions for 30 minutes of pressure holding. During this period, the adhesive fully melts, flows, and penetrates the microstructure of each layer of material, achieving cross-linking and curing to form a strong interlayer bond. After pressure holding, the hot press automatically enters the cooling stage, using a built-in circulating water cooling system to slowly reduce the platen temperature to 60°C at a cooling rate of 5°C / min. This slow cooling process helps release internal stress in the material, preventing warping or delamination caused by rapid cooling. After cooling, the hydraulic system releases pressure, and the platen automatically opens. The operator carefully removes the finished second-generation high-temperature resistant waterproof insulation sheet. The finished products are then sent to the edge trimming station, where a CNC cutting machine is used to remove excess material from the edges. After surface cleaning, the final dimensions, appearance, flatness, and interlayer bonding strength are tested non-destructively to ensure that the products fully meet the design requirements before they can be packaged and stored.

[0069] Table 2: Performance Comparison Table of Products in Example 2

[0070] As shown in Table 2, the second-generation high-temperature resistant waterproof insulation sheet prepared using the upper limit of the process parameter range in this embodiment has improved performance compared to the product of Example 1 and the existing conventional aluminum silicate fiber insulation sheet. Specifically, compared to the product of Example 1, the thermal conductivity of the product in this embodiment decreased from 0.028 W / (m·K) to 0.026 W / (m·K), the limiting oxygen index increased from 48% to 55%, and the interlayer peel strength increased from 15 N / cm to 22 N / cm, indicating that its thermal insulation performance, flame retardant performance, and structural stability have been further enhanced.

[0071] The above embodiments illustrate preferred embodiments of the present invention. Any equivalent adjustments to the technical solution based on chemical engineering methods are within the scope of protection, including but not limited to: using different chemical reaction processes to achieve technical effects, optimizing the production process flow, adjusting the raw material ratio scheme, improving reactor design, and improving energy efficiency. Any implementation scheme derived from reasonable modifications to the production process, raw material utilization, equipment configuration, or system integration level without departing from the core technology of the present invention should be considered within the scope of protection defined by the claims of the present invention.

Claims

1. A second-generation high-temperature resistant waterproof and heat-insulating sheet, characterized in that, The device includes a heat insulation sheet body, which includes a base layer, a first composite layer fixedly connected to the top of the base layer, a first fireproof layer fixedly connected to the top of the first composite layer, and a first hydrophobic layer fixedly connected to the top of the first fireproof layer. The base layer is fixedly connected to the bottom of a second composite layer, the second composite layer is fixedly connected to the bottom of a second fireproof layer, and the second fireproof layer is fixedly connected to the bottom of a second hydrophobic layer.

2. The second-generation high-temperature resistant waterproof and heat-insulating sheet according to claim 1, characterized in that, The first composite layer includes a high-temperature resistant layer, a heat insulation layer, and a flame-retardant layer. The heat insulation layer is fixed on top of the high-temperature resistant layer, and the flame-retardant layer is fixed on top of the heat insulation layer.

3. The second-generation high-temperature resistant waterproof and heat-insulating sheet according to claim 1, characterized in that, The first composite layer, the first fireproof layer, the first hydrophobic layer, the second composite layer, the second fireproof layer, and the second hydrophobic layer are all formed by hot pressing with flame-retardant double-sided adhesive, and the first composite layer, the first fireproof layer, the first hydrophobic layer, the second composite layer, the second fireproof layer, and the second hydrophobic layer are a single integral structure.

4. A method for preparing a second-generation high-temperature resistant waterproof and heat-insulating sheet, characterized in that, The method is used to prepare the second-generation high-temperature resistant waterproof and heat-insulating sheet according to any one of claims 1-3, and includes the following steps: S1: Prepare the top component, obtain the first composite layer, the first fireproof layer and the first hydrophobic layer, fix the first fireproof layer to the top of the first composite layer by hot pressing with flame-retardant double-sided adhesive, and then fix the first hydrophobic layer to the top of the first fireproof layer by hot pressing with the flame-retardant double-sided adhesive to obtain the top component. S2: Prepare the bottom component, obtain the second composite layer, the second fireproof layer and the second hydrophobic layer, fix the second fireproof layer to the bottom of the second composite layer by hot pressing with flame-retardant double-sided adhesive, and then fix the second hydrophobic layer to the bottom of the second fireproof layer by hot pressing with the flame-retardant double-sided adhesive to obtain the bottom component; S3: Composite assembly, obtaining the base layer, hot-pressing the top component to the top of the base layer with flame-retardant double-sided adhesive, and simultaneously hot-pressing the bottom component to the bottom of the base layer with the same flame-retardant double-sided adhesive, to obtain a second-generation high-temperature resistant waterproof and heat-insulating sheet.

5. The method for preparing the second-generation high-temperature resistant waterproof and heat-insulating sheet according to claim 4, characterized in that, The steps for preparing the top-level component in S1 specifically include: S11: Obtain a high-temperature resistant layer, a heat insulation layer, and a flame-retardant layer. Use a first flame-retardant double-sided adhesive to hot-press and fix the heat insulation layer to the top of the high-temperature resistant layer. Then use a second flame-retardant double-sided adhesive to hot-press and fix the flame-retardant layer to the top of the heat insulation layer to obtain a first composite layer. S12: Obtain the first fireproof layer, and use the third flame-retardant double-sided adhesive to hot-press and fix the first fireproof layer to the top of the flame-retardant layer of the first composite layer; S13: Obtain the first hydrophobic layer, and use the fourth flame-retardant double-sided adhesive to hot-press and fix the first hydrophobic layer to the top of the first fireproof layer to obtain the top layer component.

6. The method for preparing the second-generation high-temperature resistant waterproof and heat-insulating sheet according to claim 4, characterized in that, The steps for preparing the underlying component in S2 specifically include: S21: Obtain the second composite layer, the second fireproof layer, and the second hydrophobic layer; S22: The second fireproof layer is aligned and hot-pressed to the bottom of the second composite layer using the fifth flame-retardant double-sided adhesive; S23: The second hydrophobic layer is aligned and hot-pressed to the bottom of the second fireproof layer using the sixth flame-retardant double-sided adhesive, ensuring that the edges of each layer are aligned, to obtain the bottom component.

7. The method for preparing the second-generation high-temperature resistant waterproof and heat-insulating sheet according to claim 4, characterized in that, The steps of the composite assembly in S3 specifically include: S31: Obtain the base layer, the top layer component, the bottom layer component, the seventh flame-retardant double-sided adhesive, and the eighth flame-retardant double-sided adhesive; S32: Positioning and bonding: Place the seventh flame-retardant double-sided adhesive on the top of the base layer, align and bond the top layer component to the seventh flame-retardant double-sided adhesive, place the eighth flame-retardant double-sided adhesive on the bottom of the base layer, align and bond the bottom layer component to the eighth flame-retardant double-sided adhesive, forming a structure to be pressed together; S33: Hot pressing: The structure to be pressed is placed in a hot pressing device and pressed at a preset temperature. and preset pressure Hot pressing is performed below, and the holding time is... After cooling and demolding, the second-generation high-temperature resistant waterproof and heat-insulating sheet is obtained.

8. The method for preparing the second-generation high-temperature resistant waterproof and heat-insulating sheet according to claim 7, characterized in that, The preset temperature The value ranges from 150°C to 180°C; The preset pressure The value range is from 1.0 MPa to 2.5 MPa; The holding time The value range is from 15 minutes to 30 minutes.

9. The method for preparing the second-generation high-temperature resistant waterproof and heat-insulating sheet according to claim 5, characterized in that, The step of preparing the first composite layer in S11 specifically includes: S111: Obtain a high-temperature resistant layer substrate and a heat insulation layer substrate, and use the first flame-retardant double-sided adhesive to hot-press and fix the heat insulation layer substrate to the top of the high-temperature resistant layer substrate to form a composite base layer; S112: Preparation of flame-retardant slurry: Phosphorus-based flame retardant, nitrogen-based flame retardant, film-forming resin, and solvent are dispersed and mixed at high speed in a stirred tank according to a predetermined mass ratio. The mass ratio of the phosphorus-based flame retardant to the nitrogen-based flame retardant is... satisfy ,in This represents the quality of phosphorus-based flame retardants. This represents the quality of nitrogen-based flame retardants, and The value ranges from 1.5 to 3.5, resulting in a uniform and stable flame-retardant slurry; S113: Coating and curing: The flame-retardant slurry is uniformly coated onto the surface of the heat insulation layer substrate of the composite base layer using a scraping process. Then, it is placed in an oven for gradient temperature drying and high-temperature cross-linking curing treatment to form a dense flame-retardant layer on the top of the heat insulation layer substrate, thus obtaining the first composite layer.

10. The method for preparing the second-generation high-temperature resistant waterproof and heat-insulating sheet according to claim 9, characterized in that, The phosphorus-based flame retardant is microencapsulated red phosphorus, and the average particle size of the microencapsulated red phosphorus is 5 μm to 15 μm; The nitrogen-based flame retardant is melamine polyphosphate.

11. The method for preparing the second-generation high-temperature resistant waterproof and heat-insulating sheet according to claim 10, characterized in that, The film-forming resin is an aqueous polyurethane emulsion, and the solid content of the aqueous polyurethane emulsion is... pass Calculation, where This represents the weight of the residue after drying. The original sample weight representing the waterborne polyurethane emulsion, and the solid content... The value ranges from 30% to 45%.

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