Titanium metal reinforced composite polymer building template and preparation method thereof

Abstract

The application relates to the technical field of building template production, and discloses a titanium metal reinforced composite polymer building template and a preparation method thereof, which comprises the following steps: feeding a titanium reinforced polymer blank into a hot press to obtain a preheating blank; heat-insulating the preheating blank to obtain a pressurized heat-insulating composite blank; when it is determined that the preparation of the pressurized heat-insulating composite blank has a risk of being substandard according to an interface combination value, determining whether the preparation of the pressurized heat-insulating composite blank is up to standard according to a maximum dielectric loss tangent value of a risk area; cooling the pressurized heat-insulating composite blank that is up to standard to obtain a pressure-maintained cooling composite blank; when it is determined that the preparation of the pressure-maintained cooling composite blank is substandard according to a cooling synchronous value during the cooling process, adjusting process parameters; demolding the pressure-maintained cooling composite blank that is up to standard to obtain the titanium metal reinforced composite polymer building template, so that the structural stability of the titanium metal reinforced composite polymer building template is improved.

Description

Technical Field

[0001] This invention relates to the field of building formwork production technology, specifically to a titanium-reinforced composite polymer building formwork and its preparation method. Background Technology

[0002] Currently, the main types of formwork used in construction projects for extreme corrosive environments are steel formwork and ordinary plastic formwork. Steel formwork is widely used due to its high strength and rigidity; however, under the corrosive effects of chloride ions and acidic / alkaline substances in coastal salt spray, salt lakes, and chemical industrial areas, its surface is prone to rapid corrosion. This not only reduces the surface smoothness of the formwork, affecting the quality of concrete pouring, but also leads to a decrease in the structural strength of the formwork, a shortened service life, and consequently, an increase in the frequency of formwork replacement and construction costs. While ordinary plastic formwork avoids corrosion problems, its molecular structure is prone to aging and degradation under the combined effects of salt spray and strong ultraviolet radiation, causing the formwork to become brittle and prone to cracking, making it unable to meet the long-term use requirements of extreme corrosive environments.

[0003] Titanium metal has natural immunity to corrosive media, making it an ideal surface material. However, in the existing hot pressing process for preparing titanium / plastic composites, the temperature field distribution during the heating stage is uneven, leading to fluctuations in the interfacial bonding quality. During the pressure holding and cooling stage, residual stress is generated due to asynchronous shrinkage, causing warping or delamination of the building formwork. Therefore, a new technical solution is needed to address these technical problems. Summary of the Invention

[0004] This application proposes a titanium-reinforced composite polymer building template and its preparation method. The template can monitor and control the interface bonding quality in real time and in stages during the pressure insulation stage to ensure that the titanium foil and the polymer core material are fully bonded. During the pressure insulation and cooling stage, the template can monitor and dynamically adjust the shrinkage synchronization of the cooling process in real time to avoid residual stress caused by the difference in thermal expansion between titanium and polymer, and prevent the template from warping, deforming and peeling off.

[0005] Therefore, the first aspect of this application provides a method for preparing a titanium-reinforced composite polymer building template, comprising: After applying pre-compression to the titanium-reinforced polymer preform, it is fed into a hot press and heated to the first preset temperature at a preset heating rate to obtain a preheated slab. The preheated slab is kept at a preset insulation temperature and a preset insulation pressure for a preset insulation time to obtain a pressurized and insulated composite slab; the AC impedance values ​​of several detection areas on the surface of the pressurized and insulated composite slab are collected to obtain the interface bonding characterization value of the pressurized and insulated composite slab. When it is determined from the interface and characterization value that the preparation of the pressure-insulated composite board blank has a risk of not meeting the preset standard, the preparation of the pressure-insulated composite board blank shall be determined a second time based on the maximum dielectric loss tangent of the risk area. The pressurized and heat-insulating composite slab that meets the preset standard is cooled to a second preset temperature for a preset cooling time while maintaining the preset pressure, to obtain a pressure-cooled composite slab; during the cooling process, the cooling synchronous characterization value of the pressure-cooled composite slab is obtained by the temperature-time curve of the detection area; If the preparation of the pressure-holding and cooling composite slab does not meet the preset standard based on the cooling synchronization characterization value, the cooling medium flow rate in the abnormal cooling area shall be reduced or the preset cooling time shall be increased. The pressure-holding and cooling composite slab blank that meets the preset standards is released from the preset pressure-holding pressure and demolded from the hot press to obtain a titanium metal reinforced composite polymer building template.

[0006] By adopting the above technical solution: during the pressure insulation stage, monitoring and controlling the interface bonding quality ensures that the titanium foil and the polymer core material are fully bonded; during the pressure holding and cooling stage, monitoring and adjusting the shrinkage synchronization avoids residual stress caused by thermal expansion differences, thereby ensuring the preparation stability of the titanium metal reinforced composite polymer building template.

[0007] Preferably, the process of obtaining the titanium-reinforced polymer preform includes: Prepare a first titanium foil as the upper reinforcing layer and a second titanium foil as the lower reinforcing layer; Prepare polymer core material boards; Prepare the first adhesive layer and the second adhesive layer; The lower reinforcing layer, the first adhesive layer, the polymer core material board, the second adhesive layer, and the upper reinforcing layer are stacked in a bottom-to-top order to form the titanium-reinforced polymer preform. The first adhesive layer is used to bond the lower reinforcing layer to the polymer core board, and the second adhesive layer is used to bond the upper reinforcing layer to the polymer core board.

[0008] By adopting the above technical solution, a five-layer composite structure was constructed, with a polymer core board as the main body and two layers of titanium foil as reinforcing layers. This structure utilizes the excellent corrosion resistance of titanium foil as a surface protective layer, making it suitable for corrosive environments; the polymer core board ensures the lightweight and mechanical properties of the template; and two adhesive layers achieve a strong bond between the titanium foil and the polymer core material, providing a structural foundation for improving the interface bonding quality in subsequent hot pressing processes.

[0009] Preferably, the process of determining whether the preparation of the pressurized thermal insulation composite slab meets the preset standard based on the interfacial bonding characterization value of the pressurized thermal insulation composite slab includes: The interface combined with the characterization value is compared with the first preset interface combined with the characterization value and the second preset interface combined with the characterization value respectively; If the interface bonding characterization value is less than the first preset interface bonding characterization value, then the preparation of the pressurized thermal insulation composite board blank is determined to meet the preset standard. If the interface bonding characterization value is greater than or equal to the first preset interface bonding characterization value and less than the second preset interface bonding characterization value, it is determined that the preparation of the pressure-insulated composite board blank has a risk of not meeting the preset standard, and the preparation of the pressure-insulated composite board blank is further determined based on the maximum dielectric loss tangent value of the risk area. If the interface bonding characterization value is greater than or equal to the second preset interface bonding characterization value, it is determined that the preparation of the pressurized thermal insulation composite board does not meet the preset standard, and the preset thermal insulation temperature is increased according to the difference between the interface bonding characterization value and the second preset interface bonding characterization value.

[0010] By adopting the above technical solution, a three-level grading system for the interface bonding quality during the pressure insulation stage was established. The interface bonding status was divided into three levels: meeting the standard, posing a risk, and not meeting the standard. This enabled a refined assessment of the interface bonding quality, ensuring that the interface bonding quality of each batch of slabs could meet the preset standard. This solved the problem of interface bonding quality fluctuation caused by uneven temperature distribution or insufficient insulation in the existing process.

[0011] Preferably, several temperature adjustment methods are provided to accommodate an increase in the preset insulation temperature, wherein, If the interface bonding characteristic difference is less than the first preset interface bonding characteristic difference, then the preset heat preservation temperature is increased to the corresponding value using the first adjustment coefficient. If the interface bonding characteristic difference is greater than or equal to the first preset interface bonding characteristic difference and less than the second preset interface bonding characteristic difference, then the preset heat preservation temperature is increased to the corresponding value using the second adjustment coefficient. If the interface combination characteristic difference is greater than or equal to the second preset interface combination characteristic difference, then the preset heat preservation temperature is increased to the corresponding value using the third adjustment coefficient.

[0012] By adopting the above technical solution, multi-level temperature adjustment coefficients are set according to different ranges of interface and characterization difference, thereby achieving precise control over the increase of the preset insulation temperature.

[0013] Preferably, the process of obtaining the interface combined with the characterization value includes: The surface of the pressurized thermal insulation composite board blank is evenly divided into several detection areas; An AC excitation voltage is applied to each detection area at a preset AC frequency, and the AC impedance value of each detection area is collected. Based on the AC impedance values ​​of each detection area, calculate the arithmetic mean and standard deviation of all AC impedance values; The ratio of the standard deviation to the arithmetic mean is denoted as the interface combination characterization value.

[0014] By adopting the above technical solution, the surface of the slab is uniformly divided into multiple detection areas and AC impedance values ​​are collected separately to realize spatial distribution monitoring of the interface bonding state. The smaller the interface bonding characterization value, the more uniform the interface bonding is; the larger the interface bonding characterization value, the more local anomaly exists in the interface bonding, thereby improving the accuracy of process control during the pressure insulation stage.

[0015] Preferably, the process of determining whether the preparation of the pressure-insulated composite slab meets the preset standard based on the maximum dielectric loss tangent of the risk area includes: If the maximum dielectric loss tangent is less than the preset dielectric loss tangent, then the preparation of the pressurized thermal insulation composite board blank is determined to meet the preset standard. If the maximum dielectric loss tangent is greater than or equal to the preset dielectric loss tangent, it is determined that the preparation of the pressurized thermal insulation composite board does not meet the preset standard, and the preset thermal insulation time is increased according to the difference between the maximum dielectric loss tangent and the preset dielectric loss tangent. The risk area refers to the detection area in a plurality of detection areas where the AC impedance value is greater than or equal to a preset AC impedance value. The maximum dielectric loss tangent is the maximum value among the dielectric loss tangent values ​​of several risk regions.

[0016] By adopting the above technical solution: after determining that there is a risk in the interface bonding characterization value, the maximum dielectric loss tangent value is introduced to make a secondary judgment on the risk area, ensuring that the weakest area can also be effectively identified. When the maximum dielectric loss tangent value exceeds the preset threshold, the heat preservation time is dynamically extended to provide additional reaction time for the area that has not been fully cured, avoiding the decrease in interface bonding strength caused by incomplete curing, avoiding misjudgment, and achieving precise control of interface bonding quality.

[0017] Preferably, the process of determining whether the preparation of the pressure-holding and cooling composite slab meets the preset standard based on the cooling synchronization characterization value of the pressure-holding and cooling composite slab includes: The cooling synchronization characterization value is compared with the first preset cooling synchronization characterization value and the second preset cooling synchronization characterization value respectively; If the cooling synchronization characterization value is less than the first preset cooling synchronization characterization value, then the preparation of the pressure-holding cooling composite slab is determined to meet the preset standard. If the cooling synchronization characterization value is greater than or equal to the first preset cooling synchronization characterization value and less than the second preset cooling synchronization characterization value, it is determined that the preparation of the pressure-holding cooling composite slab does not meet the preset standard, and the cooling medium flow rate in the cooling abnormal area is reduced according to the difference between the cooling synchronization characterization value and the first preset cooling synchronization characterization value. If the cooling synchronization characterization value is greater than or equal to the second preset cooling synchronization characterization value, it is determined that the preparation of the pressure-holding and cooling composite slab does not meet the preset standard, and the preset cooling time is increased according to the difference between the cooling synchronization characterization value and the second preset cooling synchronization characterization value.

[0018] By adopting the above technical solution, a three-level classification judgment based on the synchronous characterization value of cooling is constructed in the pressure holding and cooling stage. This alleviates the asynchronous shrinkage caused by the difference in thermal expansion coefficient between the titanium metal foil layer and the polymer core material, reduces the generation of residual stress inside the slab, avoids defects such as warping deformation and interface peeling of the template, and improves the adaptability of the cooling process by adjusting the preset cooling rate or cooling time, thereby ensuring the overall forming accuracy of the template.

[0019] Preferably, the process of obtaining the cooling synchronization characterization value includes: During the process of cooling the pressurized and heat-insulating composite slab to the second preset temperature, data on the temperature change over time of several detection areas are collected at a preset acquisition frequency to obtain the temperature-time curve corresponding to each detection area. Pair two adjacent detection areas one by one, and for each pair of adjacent areas, count the number of times their corresponding two temperature-time curves intersect. The sum of the number of intersections of all adjacent region pairs is recorded as the cooling synchronization characterization value.

[0020] By adopting the above technical solution, temperature-time curves of each detection area are collected during the slab cooling process, and the sum of the number of intersections of temperature-time curves of adjacent detection areas is used as the cooling synchronization characterization value. This can intuitively and quantitatively reflect the degree of cooling synchronization of each area of ​​the pressure-holding and cooling composite slab, accurately reflect the difference in cooling rate at different positions of the slab, provide objective and reliable data basis for judging cooling synchronization, and avoid the subjectivity and error of manual judgment.

[0021] Preferably, the process of obtaining the abnormal cooling area includes: The number of times the temperature-time curve of each detection area intersects with the temperature-time curve of an adjacent detection area during the process of cooling the pressurized and insulated composite slab to the second preset temperature is counted and recorded as the number of times the detection area is disturbed. When the temperature-time curves of each pair of adjacent regions intersect once, the number of disturbances in both detection regions is counted simultaneously. The detection area where the number of disturbances is greater than or equal to the preset number of disturbances is recorded as the cooling abnormality area.

[0022] By adopting the above technical solution, the degree of cooling disorder in each detection area is quantified, and then the abnormal cooling areas are accurately screened by comparing with the preset number of disturbances. This enables precise positioning of the uneven cooling parts of the slab, thereby allowing for targeted adjustment of the preset cooling rate or cooling start time in that area, so that the local cooling rate tends to be consistent with the adjacent areas.

[0023] A second aspect of this application provides a titanium-reinforced composite polymer building template prepared by the above-described preparation method, comprising: a first titanium foil, a first adhesive layer, a polymer core material board, a second adhesive layer, and a second titanium foil stacked sequentially from top to bottom; wherein the first titanium foil and the second titanium foil are industrial pure titanium foils surface-treated with a coupling agent, each with a thickness of 0.5 mm; the polymer core material board is a polypropylene sheet with a thickness of 10 mm; and the first adhesive layer and the second adhesive layer are epoxy resin films with a thickness of 0.3 mm.

[0024] By adopting the above technical solution: the upper and lower layers of titanium foil treated with coupling agents give the template excellent corrosion resistance, making it suitable for extreme corrosive environments such as coastal areas, salt lakes, and chemical plants. The middle polypropylene core material ensures the template's rigidity while achieving lightweight design, facilitating construction. The epoxy resin film, combined with coupling agent treatment, ensures a strong bond between the titanium foil and the core material, preventing interface delamination during use.

[0025] The working principle and beneficial effects of this application are as follows: 1. This application uses a composite of upper and lower titanium foil, adhesive layer and polymer core material to form a five-layer symmetrical blank, which is then pre-pressed and graded hot-pressed to prepare the template. This not only utilizes the excellent corrosion resistance of titanium foil to resist chloride ion and acid and alkali corrosion in extreme corrosive environments, but also achieves template lightweighting through polymer core material, thereby solving the problems of easy corrosion of steel templates, easy aging and cracking of plastic templates, and heavy weight of pure titanium templates.

[0026] 2. This application achieves spatial distribution monitoring of the interfacial bonding state of the slab by uniformly dividing the slab surface into several detection areas during the pressure insulation stage, collecting the AC impedance value of each area and calculating the interfacial bonding characterization value, sensitively reflecting interfacial bonding problems, and increasing the insulation temperature when the interfacial bonding characterization value exceeds the preset threshold to ensure that the titanium foil and the polymer core material are fully bonded, thereby improving the uniformity of the interfacial bonding strength of the slab.

[0027] 3. In the cooling stage, this application quantifies the cooling synchronization characterization value by the number of temperature-time curve crosses, accurately locates the abnormal cooling area, and adaptively adjusts the preset cooling rate or cooling time. This effectively alleviates the residual stress caused by the asynchronous shrinkage of titanium metal and polymer materials, prevents template warping and deformation, and ensures the template forming accuracy and long-term reliability. Attached Figure Description

[0028] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 This is a flowchart illustrating the preparation method of titanium-reinforced composite polymer building templates according to an embodiment of this application; Figure 2 This is a flowchart illustrating how the preparation of the pressurized thermal insulation composite slab meets a preset standard based on the interface and characterization values ​​of the slab, according to an embodiment of this application. Figure 3 This is a flowchart illustrating a secondary determination, based on the maximum dielectric loss tangent of the risk area, of whether the preparation of the pressurized thermal insulation composite slab meets the preset standard in this embodiment of the application. Figure 4 This is a flowchart illustrating how the preparation of the pressure-holding and cooling composite slab meets a preset standard based on the synchronous cooling characterization value of the pressure-holding and cooling composite slab according to an embodiment of this application. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4The following flowcharts illustrate the preparation methods of titanium-reinforced composite polymer building templates according to embodiments of this application; the determination of whether the preparation of the pressure-insulated composite slab meets the preset standard based on the interface bonding characterization value of the pressure-insulated composite slab according to embodiments of this application; the determination of whether the preparation of the pressure-insulated composite slab meets the preset standard based on the maximum dielectric loss tangent value of the risk area according to embodiments of this application; and the determination of whether the preparation of the pressure-holding and cooling composite slab meets the preset standard based on the cooling synchronization characterization value of the pressure-holding and cooling composite slab according to embodiments of this application.

[0032] Step S1: Apply a pre-pressure of 0.5 MPa to the titanium-reinforced polymer preform and hold the pressure for 30 seconds. Then, send it into a hot press and heat it to the first preset temperature of 120°C at a preset heating rate of 5°C / min. After averaging the temperature for 10 minutes, a preheated slab is obtained. Step S2: The preheated slab is kept at a preset insulation temperature of 180℃ and a preset pressure of 3MPa for a preset insulation time of 15min to obtain a pressurized and insulated composite slab; the AC impedance values ​​of several detection areas on the surface of the pressurized and insulated composite slab are collected to obtain the interface bonding characterization value of the pressurized and insulated composite slab. Step S3: If it is determined that the preparation of the pressure-insulated composite board blank has a risk of not meeting the preset standard based on the interface and the characterization value, the preparation of the pressure-insulated composite board blank shall be determined for the second time based on the maximum dielectric loss tangent value of the risk area. Step S4: The pressurized and heat-insulating composite slab that meets the preset standard is cooled to a second preset temperature of 40°C for a preset cooling time of 25 minutes while maintaining the preset pressure. During the cooling process, the cooling medium flow rate of the cooling circuit corresponding to each detection area is set to 5L / min to obtain the pressure-insulating and cooling composite slab. During the cooling process, the cooling synchronous characterization value of the pressure-insulating and cooling composite slab is obtained by the temperature-time curve of the detection area. Step S5: If the preparation of the pressure-holding and cooling composite slab does not meet the preset standard according to the cooling synchronization characterization value, reduce the cooling medium flow rate in the abnormal cooling area or increase the preset cooling time. Step S6: Release the preset pressure of the pressure-holding and cooling composite slab that meets the preset standard, demold it from the hot press, and obtain the titanium metal reinforced composite polymer building template.

[0033] Specifically, the process of obtaining the titanium-reinforced polymer preform includes: Prepare a first titanium foil as the upper reinforcing layer and a second titanium foil as the lower reinforcing layer; Prepare polymer core material boards; Prepare the first adhesive layer and the second adhesive layer; The lower reinforcing layer, the first adhesive layer, the polymer core material board, the second adhesive layer, and the upper reinforcing layer are stacked sequentially from bottom to top to form the titanium-reinforced polymer preform. The adhesive application amount for both the first and second adhesive layers is 80 g / m². 2 .

[0034] The first adhesive layer is used to bond the lower reinforcing layer to the polymer core board, and the second adhesive layer is used to bond the upper reinforcing layer to the polymer core board.

[0035] Specifically, the process of determining whether the preparation of the pressurized thermal insulation composite slab meets the preset standard based on the interfacial bonding characterization value of the pressurized thermal insulation composite slab includes: The interface combined characterization value is compared with the first preset interface combined characterization value of 0.08 and the second preset interface combined characterization value of 0.18 respectively; If the interface bonding characterization value is less than the first preset interface bonding characterization value, then the preparation of the pressurized thermal insulation composite board blank is determined to meet the preset standard. If the interface bonding characterization value is greater than or equal to the first preset interface bonding characterization value and less than the second preset interface bonding characterization value, it is determined that the preparation of the pressure-insulated composite board blank has a risk of not meeting the preset standard, and the preparation of the pressure-insulated composite board blank is further determined based on the maximum dielectric loss tangent value of the risk area. If the interface bonding characterization value is greater than or equal to the second preset interface bonding characterization value, it is determined that the preparation of the pressurized thermal insulation composite board does not meet the preset standard, and the preset thermal insulation temperature is increased according to the difference between the interface bonding characterization value and the second preset interface bonding characterization value.

[0036] Specifically, the first preset interface combined with the characterization value has a value range of [0.05, 0.10], and the second preset interface combined with the characterization value has a value range of [0.15, 0.25]. Preferably, the first preset interface combined with the characterization value has a value of 0.08, and the second preset interface combined with the characterization value has a value of 0.18.

[0037] Specifically, the interface bonding characterization value represents the uniformity of the interface bonding between the titanium reinforcement layer and the polymer core material in the pressure-insulated composite slab. The smaller the interface bonding characterization value, the more concentrated the impedance values ​​in each region, the more uniform the temperature and pressure fields, and the better the consistency of the interface bonding quality. The larger the interface bonding characterization value, the more abnormally high the impedance values ​​in a local area, indicating poor interface bonding in that area. When the interface bonding characterization value is less than the first preset threshold, it is judged to meet the standard, indicating good interface bonding uniformity, and no intervention is needed to proceed to the next process. When the interface bonding characterization value is between the first and second thresholds, it is judged to have a risk, and a secondary judgment procedure is initiated. The risk area is checked by the dielectric loss tangent value to avoid misjudgment caused by single detection error or titanium surface oxidation. When the interface bonding characterization value is greater than or equal to the second threshold, it is judged to not meet the standard, indicating obvious local interface bonding defects. At this time, the insulation temperature is increased, and the flowability and curing reaction rate of the adhesive are fundamentally improved through temperature compensation, so that the interface bonding quality in each region tends to be consistent, achieving precise control of the interface bonding quality in the pressure insulation stage.

[0038] Specifically, several temperature adjustment methods are provided to address the increase of the preset insulation temperature, among which, If the interface bonding characteristic difference is less than the first preset interface bonding characteristic difference of 0.03, then the preset heat preservation temperature is increased to the corresponding value using the first adjustment coefficient of 1.03. If the interface bonding characteristic difference is greater than or equal to the first preset interface bonding characteristic difference and less than the second preset interface bonding characteristic difference of 0.06, then the preset heat preservation temperature is increased to the corresponding value using the second adjustment coefficient of 1.06. If the interface bonding characteristic difference is greater than or equal to the second preset interface bonding characteristic difference, then the preset heat preservation temperature is increased to the corresponding value using a third adjustment coefficient of 1.09.

[0039] Specifically, the process of obtaining the interface combined with the representation value includes: The surface of the pressurized thermal insulation composite board blank is evenly divided into 5 rows × 5 columns of detection areas. The size of each detection area is 100mm × 100mm. A set of conductive silver paste electrodes is arranged at the geometric center of each detection area, and the electrode leads are connected to a high-frequency AC impedance analyzer. An AC excitation voltage of 50mV is applied to each detection area at a preset AC frequency of 5kHz, and the AC impedance value of each detection area is collected. Based on the AC impedance values ​​of each detection area, calculate the arithmetic mean and standard deviation of all AC impedance values; The ratio of the standard deviation to the arithmetic mean is denoted as the interface combination characterization value.

[0040] Specifically, the process of determining whether the preparation of the pressure-insulated composite slab meets the preset standard based on the maximum dielectric loss tangent value of the risk area includes: If the maximum dielectric loss tangent is less than the preset dielectric loss tangent of 0.03, then the preparation of the pressurized thermal insulation composite board blank is determined to meet the preset standard. If the maximum dielectric loss tangent is greater than or equal to the preset dielectric loss tangent, it is determined that the preparation of the pressurized thermal insulation composite board does not meet the preset standard, and the preset thermal insulation time is increased according to the difference between the maximum dielectric loss tangent and the preset dielectric loss tangent. The risk area refers to the detection area in a plurality of detection areas where the AC impedance value is greater than or equal to the preset AC impedance value of 3.0Ω; The maximum dielectric loss tangent is the maximum value among the dielectric loss tangent values ​​of several risk regions.

[0041] Specifically, the increase in the preset heat preservation time is positively correlated with the difference between the maximum dielectric loss tangent and the preset dielectric loss tangent. The positive correlation can be linear or nonlinear. The linear slope of the linear positive correlation is not specifically limited. It can be understood that the greater the difference between the maximum dielectric loss tangent and the preset dielectric loss tangent, the greater the increase in the preset heat preservation time.

[0042] Specifically, the dielectric loss tangent is measured using an impedance analyzer. Under the same frequency and voltage conditions as the AC impedance value acquisition, the test electrodes of the impedance analyzer are connected to pre-set electrode contacts in the detection area corresponding to the risk area. The impedance analyzer can directly read and output the dielectric loss tangent value of that area. Measuring the dielectric loss tangent is a well-known technique in the field, and existing commercial instruments such as high-frequency impedance analyzers and LCR meters all have the function of directly measuring and outputting the dielectric loss tangent value.

[0043] Specifically, under the same material system (titanium foil, polypropylene core, epoxy resin film) and hot-pressing process conditions (insulation temperature 180℃, pressure 3MPa), pressurized and insulated composite board samples with different insulation times (e.g., 5min, 10min, 15min, 20min) were prepared to obtain specimens with different degrees of curing. Using the same testing conditions as in the production site (frequency 5kHz, voltage 50mV, temperature 180℃), the dielectric loss tangent of the risk area of ​​each sample was measured. Simultaneously, the actual interfacial bonding quality of each sample was verified through peel strength testing. The lowest dielectric loss tangent that meets the interfacial bonding strength design requirements (peel strength ≥ 2.0N / mm) was used as the preset threshold; in this embodiment, the preset dielectric loss tangent was 0.03.

[0044] Specifically, the maximum dielectric loss tangent characterizes the severity of interface defects in the risk area. An ideal interface between the titanium reinforcement layer and the polymer core material (without debonding, missing adhesive, or pores) exhibits stable dielectric properties and low dielectric energy loss, resulting in a relatively small dielectric loss tangent. When debonding, missing adhesive, or micropores exist in the risk area, the dielectric continuity of the interface layer is disrupted, leading to a significant increase in dielectric energy loss and a corresponding rise in the dielectric loss tangent. When the maximum dielectric loss tangent exceeds a preset threshold, it indicates that there are defects in the interface bonding of the risk area. In this case, the preset insulation time should be increased to allow the adhesive more time to complete impregnation and curing.

[0045] Specifically, the process of determining whether the preparation of the pressure-holding and cooling composite slab meets the preset standard based on the cooling synchronization characterization value of the pressure-holding and cooling composite slab includes: The cooling synchronization characterization value is compared with the first preset cooling synchronization characterization value 5 times and the second preset cooling synchronization characterization value 15 times respectively. If the cooling synchronization characterization value is less than the first preset cooling synchronization characterization value, then the preparation of the pressure-holding cooling composite slab is determined to meet the preset standard. If the cooling synchronization characterization value is greater than or equal to the first preset cooling synchronization characterization value and less than the second preset cooling synchronization characterization value, it is determined that the preparation of the pressure-holding cooling composite slab does not meet the preset standard, and the cooling medium flow rate in the cooling abnormal area is reduced according to the difference between the cooling synchronization characterization value and the first preset cooling synchronization characterization value. If the cooling synchronization characterization value is greater than or equal to the second preset cooling synchronization characterization value, it is determined that the preparation of the pressure-holding and cooling composite slab does not meet the preset standard, and the preset cooling time is increased according to the difference between the cooling synchronization characterization value and the second preset cooling synchronization characterization value.

[0046] Specifically, the reduction in the cooling medium flow rate in the abnormal cooling area is positively correlated with the difference between the cooling synchronization characterization value and the first preset cooling synchronization characterization value. The positive correlation can be linear or nonlinear. The slope of the linear positive correlation is not specifically limited. It can be understood that the greater the difference between the cooling synchronization characterization value and the first preset cooling synchronization characterization value, the greater the reduction in the cooling medium flow rate in the abnormal cooling area.

[0047] Specifically, the cooling synchronization characterization value reflects the synchronicity of the cooling rhythm in different regions of the slab during the pressure-holding cooling process. The smaller the value, the closer the cooling rates of each region are, the more stable the relative relationship of the temperature curves, and the better the shrinkage synchronization. The larger the value, the more frequent the temperature reversal between different regions, the disordered cooling sequence, and the more severe the shrinkage asynchrony. When the cooling synchronization characterization value is between the first and second thresholds, it is judged as a mild anomaly. At this time, the cooling medium flow rate in the abnormal cooling region is reduced, and the cooling rate of this region is made to converge with the adjacent region through local adjustment. When the cooling synchronization characterization value is greater than or equal to the second threshold, it is judged as a severe anomaly. At this time, the preset cooling time is increased. By extending the overall cooling time, more space is provided for heat conduction, which solves the shrinkage disorder caused by excessive temperature difference or time sequence misalignment. This avoids the impact of excessive intervention on the normal region and ensures that the shrinkage synchronization is effectively compensated when it is severely insufficient, thereby fundamentally solving the warping deformation problem caused by the difference in thermal expansion between titanium and polymers.

[0048] Specifically, under the same material system and cooling process conditions, samples with different degrees of cooling synchronization were prepared, and their cooling synchronization characterization values ​​were measured and correlated with the results of the plate surface flatness test after unloading. The upper limit of the cooling synchronization characterization value in the qualified samples was taken as the first preset cooling synchronization characterization value, with a value range of [3 times, 8 times], preferably 5 times; the lower limit of the cooling synchronization characterization value in the unqualified samples was taken as the second preset cooling synchronization characterization value, with a value range of [12 times, 20 times], preferably 15 times.

[0049] Specifically, the process of obtaining the cooling synchronization characterization value includes: During the process of cooling the pressurized and heat-insulating composite slab to the second preset temperature, thermocouple sensors are arranged at the geometric center of each detection area to collect data on the temperature change of several detection areas over time at a preset acquisition frequency of 1 time / second, so as to obtain the temperature-time curve corresponding to each detection area. Pair two adjacent detection areas one by one, and for each pair of adjacent areas, count the number of times their corresponding two temperature-time curves intersect. The sum of the number of intersections of all adjacent region pairs is recorded as the cooling synchronization characterization value.

[0050] Specifically, the process of obtaining the abnormal cooling area includes: The number of times the temperature-time curve of each detection area intersects with the temperature-time curve of an adjacent detection area during the process of cooling the pressurized and insulated composite slab to the second preset temperature is counted and recorded as the number of times the detection area is disturbed. When the temperature-time curves of each pair of adjacent regions intersect once, the number of disturbances in both detection regions is counted simultaneously. The detection area where the number of disturbances is greater than or equal to the preset number of disturbances (3 times) is recorded as the cooling abnormal area.

[0051] In a second aspect of this embodiment, a titanium-reinforced composite polymer building template prepared by the above-described preparation method is provided, comprising: a first titanium foil, a first adhesive layer, a polymer core material board, a second adhesive layer, and a second titanium foil stacked sequentially from top to bottom; wherein the first titanium foil and the second titanium foil are industrial pure titanium foils surface-treated with a coupling agent, each with a thickness of 0.5 mm; the polymer core material board is a polypropylene sheet with a thickness of 10 mm; and the first adhesive layer and the second adhesive layer are epoxy resin films with a thickness of 0.3 mm.

[0052] Example 1: Perform all steps completely according to the technical solution of this application: Step S1: Apply a pre-pressure of 0.5 MPa to the titanium-reinforced polymer preform and hold it for 30 seconds. Then, send it into a hot press and heat it to 120°C at a rate of 5°C / min. After 10 minutes of uniform heating, a preheated slab is obtained.

[0053] Step S2: The preheated slab is held at 180℃ and 3MPa for 15 minutes to obtain a pressurized and insulated composite slab. The AC impedance values ​​(5kHz, 50mV) of 25 detection areas are collected, and the interfacial bonding characterization value is calculated to be 0.07.

[0054] Step S3: The interface combination characterization value of 0.07 is less than the first preset interface combination characterization value of 0.08, so it is determined that it meets the standard.

[0055] Step S4: Under the condition of maintaining a pressure of 3MPa, the temperature is reduced to 40℃ over a cooling time of 25 minutes to obtain a pressure-holding cooled composite slab. Temperature data of each region is collected during the cooling process, and the total number of crossovers of 40 pairs of adjacent regions is counted to obtain 5 cooling synchronization characterization values.

[0056] Step S5: The cooling synchronization index 5 times equals the first preset cooling synchronization index 5 times, indicating a critical state. The number of disturbances in each region is counted; regions with 4 and 3 disturbances respectively are marked as abnormal cooling regions. The cooling medium flow rate is reduced for these regions, and cooling continues for 5 minutes before re-monitoring. The cooling synchronization index drops to 2 times, meeting the standard.

[0057] Step S6: Release the holding pressure and demold the titanium metal reinforced composite polymer building template.

[0058] Comparative Example 1: A titanium-reinforced polymer preform was prepared using the same layup method as in Example 1 (0.5 mm first titanium foil, 0.5 mm second titanium foil, 10 mm polypropylene core, 0.3 mm epoxy resin film, with a coating amount of 80 g / m²). The preform was subjected to a pre-pressure of 0.5 MPa for 30 seconds and then fed into a hot press. The temperature was increased to 120°C at a rate of 5°C / min and uniformly heated for 10 minutes. Subsequently, it was held at 180°C and 3 MPa for 15 minutes, and then cooled directly to 40°C over a 25-minute cooling period. The preform was then unloaded to obtain the building template.

[0059] Comparative Example 2: This comparative example included interface bonding characterization value detection during the pressure holding stage, but lacked a secondary judgment procedure for the dielectric loss tangent and a synchronous cooling characterization value detection and adjustment procedure. The preliminary steps were the same as in the embodiment. After the pressure holding period, AC impedance values ​​were collected for each detection area, and the calculated interface bonding characterization value was 0.15 (between the first preset interface bonding characterization value of 0.08 and the second preset interface bonding characterization value of 0.18, indicating a potential risk). Since no secondary judgment procedure was implemented, this comparative example directly determined that the slab met the standard and proceeded to the cooling process. The cooling process used a fixed cooling time of 25 minutes to lower the temperature to 40°C, after which the slab was unloaded to obtain the template.

[0060] Table 1 Performance Comparison of Example 1, Comparative Example 1, and Comparative Example 2 As shown in Table 1, Example 1, which adopts the complete technical solution of this application, produces titanium-reinforced composite polymer building templates with the best interfacial peel strength, while exhibiting the lowest board warpage and debonding rate. Compared to Comparative Example 1, which did not have any online detection or parameter control, Example 1 shows a significant improvement in overall performance, effectively solving the product defects caused by uneven interfacial bonding and asynchronous cooling under traditional fixed processes. Compared to Comparative Example 2, which only sets interfacial bonding characterization value detection without secondary judgment or synchronous cooling control, Example 1, through complete interfacial quality judgment and cooling anomaly adjustment, further optimizes interfacial bonding stability and cooling shrinkage synchronization, and its various performance indicators are significantly better than those of Comparative Example 2. This fully demonstrates that the detection judgment and closed-loop control scheme of this application can effectively improve product quality and production qualification rate.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a titanium-reinforced composite polymer building template, characterized in that, include: After applying pre-compression to the titanium-reinforced polymer preform, it is fed into a hot press and heated to the first preset temperature at a preset heating rate to obtain a preheated slab. The preheated slab is kept at a preset heat preservation temperature and a preset pressure for a preset heat preservation time to obtain a pressurized and heat-insulating composite slab. The AC impedance values ​​of several detection areas on the surface of the pressurized thermal insulation composite slab are collected to obtain the interface bonding characterization value of the pressurized thermal insulation composite slab. When it is determined from the interface and characterization value that the preparation of the pressure-insulated composite board blank has a risk of not meeting the preset standard, the preparation of the pressure-insulated composite board blank shall be determined a second time based on the maximum dielectric loss tangent of the risk area. The pressurized and heat-insulating composite slab blank that meets the preset standard is cooled to a second preset temperature for a preset cooling time while maintaining the preset pressure, to obtain a pressure-insulating and cooled composite slab blank. During the cooling process, the cooling synchronous characterization value of the pressure-holding and cooling composite slab is obtained by using the temperature-time curve of the detection area; If the preparation of the pressure-holding and cooling composite slab does not meet the preset standard based on the cooling synchronization characterization value, the cooling medium flow rate in the abnormal cooling area shall be reduced or the preset cooling time shall be increased. The pressure-holding and cooling composite slab blank that meets the preset standards is released from the preset pressure-holding pressure and demolded from the hot press to obtain a titanium metal reinforced composite polymer building template.

2. The method for preparing titanium-reinforced composite polymer building templates according to claim 1, characterized in that, The process of obtaining the titanium-reinforced polymer preform includes: Prepare a first titanium foil as the upper reinforcing layer and a second titanium foil as the lower reinforcing layer; Prepare polymer core material boards; Prepare the first adhesive layer and the second adhesive layer; The lower reinforcing layer, the first adhesive layer, the polymer core material board, the second adhesive layer, and the upper reinforcing layer are stacked in a bottom-to-top order to form the titanium-reinforced polymer preform. The first adhesive layer is used to bond the lower reinforcing layer to the polymer core board, and the second adhesive layer is used to bond the upper reinforcing layer to the polymer core board.

3. The method for preparing titanium-reinforced composite polymer building templates according to claim 1, characterized in that, The process of determining whether the preparation of the pressurized thermal insulation composite slab meets the preset standard based on the interfacial bonding characterization values ​​of the pressurized thermal insulation composite slab includes: The interface combined with the characterization value is compared with the first preset interface combined with the characterization value and the second preset interface combined with the characterization value respectively; If the interface bonding characterization value is less than the first preset interface bonding characterization value, then the preparation of the pressurized thermal insulation composite board blank is determined to meet the preset standard. If the interface bonding characterization value is greater than or equal to the first preset interface bonding characterization value and less than the second preset interface bonding characterization value, it is determined that the preparation of the pressure-insulated composite board blank has a risk of not meeting the preset standard, and the preparation of the pressure-insulated composite board blank is further determined based on the maximum dielectric loss tangent value of the risk area. If the interface bonding characterization value is greater than or equal to the second preset interface bonding characterization value, it is determined that the preparation of the pressurized thermal insulation composite board does not meet the preset standard, and the preset thermal insulation temperature is increased according to the difference between the interface bonding characterization value and the second preset interface bonding characterization value.

4. The method for preparing titanium-reinforced composite polymer building templates according to claim 3, characterized in that, Several temperature adjustment methods are provided to accommodate the increase of the preset insulation temperature, among which, If the interface bonding characteristic difference is less than the first preset interface bonding characteristic difference, then the preset heat preservation temperature is increased to the corresponding value using the first adjustment coefficient. If the interface bonding characteristic difference is greater than or equal to the first preset interface bonding characteristic difference and less than the second preset interface bonding characteristic difference, then the preset heat preservation temperature is increased to the corresponding value using the second adjustment coefficient. If the interface combination characteristic difference is greater than or equal to the second preset interface combination characteristic difference, then the preset heat preservation temperature is increased to the corresponding value using the third adjustment coefficient.

5. The method for preparing titanium-reinforced composite polymer building templates according to claim 4, characterized in that, The process of obtaining the interface combined with the characterization value includes: The surface of the pressurized thermal insulation composite board blank is evenly divided into several detection areas; An AC excitation voltage is applied to each detection area at a preset AC frequency, and the AC impedance value of each detection area is collected. Based on the AC impedance values ​​of each detection area, calculate the arithmetic mean and standard deviation of all AC impedance values; The ratio of the standard deviation to the arithmetic mean is denoted as the interface combination characterization value.

6. The method for preparing titanium-reinforced composite polymer building templates according to claim 5, characterized in that, The process of determining whether the preparation of the pressure-insulated composite slab meets the preset standard based on the maximum dielectric loss tangent value of the risk area includes: If the maximum dielectric loss tangent is less than the preset dielectric loss tangent, then the preparation of the pressurized thermal insulation composite board blank is determined to meet the preset standard. If the maximum dielectric loss tangent is greater than or equal to the preset dielectric loss tangent, it is determined that the preparation of the pressurized thermal insulation composite board does not meet the preset standard, and the preset thermal insulation time is increased according to the difference between the maximum dielectric loss tangent and the preset dielectric loss tangent. The risk area refers to the detection area in a plurality of detection areas where the AC impedance value is greater than or equal to a preset AC impedance value. The maximum dielectric loss tangent is the maximum value among the dielectric loss tangent values ​​of several risk regions.

7. The method for preparing titanium-reinforced composite polymer building templates according to claim 6, characterized in that, The process of determining whether the preparation of the pressure-holding and cooling composite slab meets the preset standard based on the cooling synchronization characterization value of the pressure-holding and cooling composite slab includes: The cooling synchronization characterization value is compared with the first preset cooling synchronization characterization value and the second preset cooling synchronization characterization value respectively; If the cooling synchronization characterization value is less than the first preset cooling synchronization characterization value, then the preparation of the pressure-holding cooling composite slab is determined to meet the preset standard. If the cooling synchronization characterization value is greater than or equal to the first preset cooling synchronization characterization value and less than the second preset cooling synchronization characterization value, it is determined that the preparation of the pressure-holding cooling composite slab does not meet the preset standard, and the cooling medium flow rate in the cooling abnormal area is reduced according to the difference between the cooling synchronization characterization value and the first preset cooling synchronization characterization value. If the cooling synchronization characterization value is greater than or equal to the second preset cooling synchronization characterization value, it is determined that the preparation of the pressure-holding and cooling composite slab does not meet the preset standard, and the preset cooling time is increased according to the difference between the cooling synchronization characterization value and the second preset cooling synchronization characterization value.

8. The method for preparing titanium-reinforced composite polymer building templates according to claim 7, characterized in that, The process of obtaining the cooling synchronization characterization value includes: During the process of cooling the pressurized and heat-insulating composite slab to the second preset temperature, data on the temperature change over time of several detection areas are collected at a preset acquisition frequency to obtain the temperature-time curve corresponding to each detection area. Pair two adjacent detection areas one by one, and for each pair of adjacent areas, count the number of times their corresponding two temperature-time curves intersect. The sum of the number of intersections of all adjacent region pairs is recorded as the cooling synchronization characterization value.

9. The method for preparing titanium-reinforced composite polymer building templates according to claim 8, characterized in that, The process of obtaining the abnormal cooling area includes: The number of times the temperature-time curve of each detection area intersects with the temperature-time curve of an adjacent detection area during the process of cooling the pressurized and insulated composite slab to the second preset temperature is counted and recorded as the number of times the detection area is disturbed. When the temperature-time curves of each pair of adjacent regions intersect once, the number of disturbances in both detection regions is counted simultaneously. The detection area where the number of disturbances is greater than or equal to the preset number of disturbances is recorded as the cooling abnormality area.

10. A titanium-reinforced composite polymer building template prepared by the preparation method according to any one of claims 1-9, characterized in that, include: The components are arranged in a top-to-bottom sequence: a first titanium foil, a first adhesive layer, a polymer core board, a second adhesive layer, and a second titanium foil. The first and second titanium foils are industrial pure titanium foils surface-treated with a coupling agent, each with a thickness of 0.5 mm. The polymer core board is a polypropylene sheet with a thickness of 10 mm. The first and second adhesive layers are epoxy resin films, each with a thickness of 0.3 mm.

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