Method and system for detecting content of volatile organic compounds in curing agent

Abstract

The invention relates to the technical field of component content analysis, in particular to a method and system for detecting the content of volatile organic compounds in a curing agent, and the method comprises the following steps: determining gas transmission delay according to the no-load operation process of a target tunnel type oven; determining a comprehensive physical reference coefficient according to the physical volatilization operation process of the target tunnel type drying oven without chemical reaction, the gas transmission delay and an Antow empirical formula; determining a current molar evaporation enthalpy and a current pre-exponential factor; determining a physical volatilization benchmark reference value by combining the alignment temperature data at the current moment; and detecting the content of the organic volatile matters in the curing agent according to the physical volatilization benchmark reference value and the actually measured gas concentration data of each curing reaction temperature zone at the current moment. By analyzing the no-load operation process, the physical volatilization operation process without chemical reaction and the current curing reaction operation process of the tunnel type drying oven, the content of the volatile organic compounds in the curing agent is detected, and the detection accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of component content analysis technology, specifically to a method and system for detecting the content of volatile organic compounds in curing agents. Background Technology

[0002] In the coating manufacturing industry of lithium battery electrodes, optical functional films, and flexible copper-clad laminates, the curing of solvent-based thermosetting resins is a critical process. This process is often carried out continuously in a tunnel oven and involves two parallel mass transfer and reaction behaviors: one is the physical drying process by removing organic solvents through heating; the other is the chemical curing process by which curing agent molecules undergo cross-linking polymerization at a specific temperature and release small molecule byproducts.

[0003] Currently, industrial sites primarily rely on online total hydrocarbon analyzers (such as FID or PID sensors) to monitor the total concentration of volatile organic compounds (VOCs) inside drying ovens. However, when using this method, the following technical problems often arise: For example, in the early and middle stages of drying, the concentration of VOCs generated by physical evaporation of solvents is usually 1-2 orders of magnitude higher than the concentration of byproducts released by chemical cross-linking. The trace chemical reaction signals are often completely drowned out by the strong background noise of the solvent, making it impossible to directly determine the starting position and intensity of the chemical reaction from the total concentration data, thus resulting in poor accuracy in detecting the content of volatile organic compounds in the curing agent. Summary of the Invention

[0004] To address the technical problem of poor accuracy in detecting the content of volatile organic compounds (VOCs) in curing agents, this invention proposes a method and system for detecting the content of VOCs in curing agents.

[0005] In a first aspect, the present invention provides a method for detecting the content of volatile organic compounds in a curing agent, the method comprising: Based on the concentration changes of tracer gas in the solvent evaporation temperature zone and each curing reaction temperature zone during the no-load operation of the target tunnel oven, the gas transmission delay corresponding to the solvent evaporation temperature zone and each curing reaction temperature zone is determined. Based on the temperature and concentration changes in the solvent evaporation temperature zone and each curing reaction temperature zone during the physical evaporation operation of the target tunnel oven without chemical reaction, as well as the gas transport delay and Antoine's empirical formula, the comprehensive physical reference coefficient corresponding to each curing reaction temperature zone is determined. Based on the temperature changes in the solvent evaporation zone during the current curing reaction operation of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula, determine the current molar enthalpy of vaporization and the current pre-exponential factor. Based on the aligned temperature data of each curing reaction temperature zone obtained at the current moment based on the gas transport delay, the comprehensive physical reference coefficient, the current molar enthalpy of vaporization, and the current pre-exponential factor obtained during the current curing reaction operation of the target tunnel oven, determine the physical volatilization reference value of each curing reaction temperature zone at the current moment; The content of volatile organic compounds in the curing agent was tested based on the physical volatile reference value and measured gas concentration data of each curing reaction temperature zone at the current moment.

[0006] In conjunction with the first aspect above, in one possible implementation, determining the gas transport delay corresponding to the solvent evaporation temperature zone and each curing reaction temperature zone based on the concentration changes of the tracer gas in the solvent evaporation temperature zone and each curing reaction temperature zone during the no-load operation of the target tunnel oven includes: The solvent evaporation temperature zone or any curing reaction temperature zone is designated as the marked temperature zone. During the no-load operation of the target tunnel oven, tracer gas is injected into the sampling port of the marked temperature zone by opening the solenoid valve, and the concentration of tracer gas is collected in real time within the marked temperature zone. The opening time of the solenoid valve when the tracer gas is injected into the sampling port of the marked temperature zone is determined as the first marking time. The sampling time corresponding to the maximum peak of all tracer gas concentrations collected within the marked temperature zone is determined as the second marking time; The duration between the first marked time and the second marked time is determined as the gas transmission delay corresponding to the marked temperature zone.

[0007] In conjunction with the first aspect above, in one possible implementation, the determination of the comprehensive physical reference coefficient corresponding to each curing reaction temperature zone based on the temperature and concentration changes in the solvent evaporation temperature zone and each curing reaction temperature zone during the non-chemically reactive physical evaporation operation of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula, includes: Real-time acquisition of measured temperature data and measured gas concentration data of solvent evaporation temperature zone and each curing reaction temperature zone during the physical evaporation process without chemical reaction; Selecting the target stable operating process from the physical volatilization process without chemical reaction; Each data acquisition moment during the stable operation of the target is defined as a temporary moment. Based on the measured temperature data and measured gas concentration data of the solvent evaporation temperature zone during the physical evaporation process without chemical reaction, as well as the gas transport delay and Antoine's empirical formula, the reference molar enthalpy of vaporization and the reference pre-exponential factor at each temporary moment are determined. Based on the gas transport delay corresponding to each curing reaction temperature zone, the alignment temperature data of each curing reaction temperature zone at the data acquisition time during the physical volatilization operation without chemical reaction is determined, thereby obtaining the alignment temperature data of each curing reaction temperature zone at each temporary moment. Based on the mean of the reference molar enthalpy of vaporization at all temporary moments, the mean of the reference pre-exponential factor at all temporary moments, and the mean of the aligned temperature data for each curing reaction temperature zone at all temporary moments, the theoretical concentration value corresponding to each curing reaction temperature zone is determined. Based on the average of the measured gas concentration data of each curing reaction temperature zone at all temporary times, and the theoretical concentration value corresponding to each curing reaction temperature zone, the comprehensive physical reference coefficient corresponding to each curing reaction temperature zone is determined.

[0008] In conjunction with the first aspect above, in one possible implementation, the screening of the target stable operating process from the physical volatilization operating process without chemical reaction includes: The maximum value among the gas transport delays corresponding to the solvent evaporation temperature zone and all curing reaction temperature zones is determined as the reference transport delay; The sum of the reference transmission delay and the preset stable duration threshold is determined as the target representative duration, and the start time of the physical volatilization process without chemical reaction is determined as the start reference time. The time interval between the start reference time and the target representative time is selected from the physical volatilization process without chemical reaction as the target segmentation time; Using the target segmentation time as the segmentation point, the physical volatilization process without chemical reaction is divided into two sub-processes, and the latest sub-process among these two sub-processes is determined as the target stable operation process.

[0009] In conjunction with the first aspect above, in one possible implementation, determining the reference molar enthalpy of vaporization and the reference pre-exponential factor at each temporary moment based on measured temperature data and measured gas concentration data during the physical evaporation process without chemical reaction, as well as gas transport delay and Antoine's empirical formula, includes: Based on the gas transport delay corresponding to the solvent evaporation temperature zone, the alignment temperature data of the solvent evaporation temperature zone at the data acquisition time during the physical evaporation process without chemical reaction is determined, thereby obtaining the alignment temperature data of the solvent evaporation temperature zone at each temporary moment, which is recorded as the alignment evaporation temperature data at each temporary moment. Any temporary moment is designated as a pending moment. If there are fewer than a preset number of temporary moments before the pending moment, the reference molar enthalpy of vaporization and the reference pre-exponential factor at the pending moment are set to the preset molar enthalpy of vaporization and the preset pre-exponential factor, respectively. If there are a preset number of temporary moments before the pending moment, and the variance of the aligned evaporation temperature data under the preset number of temporary moments closest to the pending moment is less than a preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor under the pending moment are respectively set as the reference molar enthalpy of vaporization and the reference pre-exponential factor under the previous temporary moment of the pending moment. If there are a preset number of temporary moments before the pending moment, and the variance of the aligned evaporation temperature data at the preset number of temporary moments closest to the pending moment is greater than or equal to a preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor at the pending moment are determined using the Antoine empirical formula based on the aligned evaporation temperature data at the preset number of temporary moments closest to the pending moment and the measured gas concentration data.

[0010] In conjunction with the first aspect above, in one possible implementation, determining the aligned temperature data of the solvent evaporation temperature zone at the data acquisition time during the physical evaporation process without chemical reaction, based on the gas transport delay corresponding to the solvent evaporation temperature zone, includes: Any data acquisition moment during the physical volatilization process without chemical reaction is determined as a candidate moment, and the gas transmission delay corresponding to the solvent volatilization temperature zone is determined as the reference gas transmission delay. The data acquisition time before the candidate time and with a duration equal to the reference gas transmission delay is selected from the physical volatilization process without chemical reaction and used as the data alignment time corresponding to the candidate time; The measured temperature data of the solvent evaporation temperature zone at the data alignment time corresponding to the candidate time is determined as the alignment temperature data of the solvent evaporation temperature zone at the candidate time.

[0011] In conjunction with the first aspect above, in one possible implementation, determining the current molar enthalpy of vaporization and the current pre-exponential factor based on the temperature changes in the solvent evaporation zone during the current curing reaction operation of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula, includes: Based on the gas transport delay corresponding to the solvent evaporation temperature zone, determine the aligned temperature data of the solvent evaporation temperature zone at each data acquisition moment during the current curing reaction operation. Any data acquisition moment during the current curing reaction is determined as the reference moment. If there are fewer than a preset number of data acquisition moments before the reference moment during the current curing reaction, the reference molar enthalpy of vaporization and the reference pre-exponential factor at the reference moment are set to the preset molar enthalpy of vaporization and the preset pre-exponential factor, respectively. If there are a preset number of data acquisition times before the reference time during the current curing reaction, and the variance of the aligned volatilization temperature data at the preset number of data acquisition times closest to the reference time before the reference time is less than a preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor at the reference time are respectively set as the reference molar enthalpy of vaporization and the reference pre-exponential factor at the data acquisition time before the reference time. If there are a preset number of data acquisition times before the reference time, and the variance of the aligned volatilization temperature data at the preset number of data acquisition times closest to the reference time before the reference time is greater than or equal to a preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor at the reference time are determined by the Antoine empirical formula based on the aligned volatilization temperature data and the measured gas concentration data at the preset number of data acquisition times closest to the reference time before the reference time. Thus, the reference molar enthalpy of vaporization and the reference pre-exponential factor at each data acquisition moment during the current curing reaction operation are obtained, and the reference molar enthalpy of vaporization and the reference pre-exponential factor at the last data acquisition moment during the current curing reaction operation are determined as the current molar enthalpy of vaporization and the current pre-exponential factor, respectively.

[0012] In conjunction with the first aspect above, in one possible implementation, determining the physical volatilization reference value for each curing reaction temperature zone at the current moment, based on the aligned temperature data obtained at the current moment based on the gas transport delay, the comprehensive physical reference coefficient, the current molar enthalpy of vaporization, and the current pre-exponential factor, for each curing reaction temperature zone during the current curing reaction operation of the target tunnel oven, includes: Any curing reaction temperature zone is designated as the marked curing reaction temperature zone, and the gas transport delay corresponding to the marked curing reaction temperature zone is designated as the marked curing reaction gas transport delay. The data acquisition time before the current time, and whose duration between the current time and the current time is equal to the mark solidification reaction gas transmission delay, will be used as the target alignment time corresponding to the current time. The measured temperature data of the mark curing reaction temperature zone at the target alignment time corresponding to the current time is determined as the alignment temperature data of the mark curing reaction temperature zone at the current time. Based on the alignment temperature data of the marking and curing reaction temperature zone at the current moment, the comprehensive physical reference coefficient corresponding to the marking and curing reaction temperature zone, the current molar enthalpy of vaporization and the current pre-exponential factor, determine the physical volatilization reference value of the marking and curing reaction temperature zone at the current moment.

[0013] In conjunction with the first aspect above, in one possible implementation, the detection of the volatile organic compound (VOC) content of the curing agent based on the physical volatile reference value and measured gas concentration data of each curing reaction temperature zone at the current moment includes: Based on the difference between the measured gas concentration data and the physical volatilization reference value at the current moment for each curing reaction temperature zone, the organic volatile content index, which characterizes the organic volatile content of the curing agent, is determined for each curing reaction temperature zone.

[0014] In a second aspect, the present invention provides a system for detecting the content of volatile organic compounds in a curing agent, comprising a processor and a memory, wherein the processor is configured to process instructions stored in the memory to implement the method of the first aspect or any possible implementation thereof, the system comprising: The gas transport delay determination module is used to determine the gas transport delay corresponding to the solvent evaporation temperature zone and each curing reaction temperature zone based on the concentration changes of the tracer gas in the solvent evaporation temperature zone and each curing reaction temperature zone during the no-load operation of the target tunnel oven. The comprehensive physical reference coefficient determination module is used to determine the comprehensive physical reference coefficient corresponding to each curing reaction temperature zone based on the temperature and concentration changes in the solvent evaporation temperature zone and each curing reaction temperature zone during the physical evaporation operation of the target tunnel oven without chemical reaction, as well as the gas transport delay and Antoine's empirical formula. The module for determining molar enthalpy of vaporization and pre-exponential factor is used to determine the current molar enthalpy of vaporization and the current pre-exponential factor based on the temperature changes in the solvent evaporation temperature zone during the current curing reaction operation of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula. The physical volatilization reference value determination module is used to determine the physical volatilization reference value of each curing reaction temperature zone at the current moment based on the aligned temperature data obtained at the current moment based on the gas transport delay, the comprehensive physical reference coefficient, the current molar enthalpy of vaporization, and the current pre-exponential factor obtained at the current moment for each curing reaction temperature zone during the current curing reaction operation of the target tunnel oven. The curing agent volatile organic compound (VOC) content detection module is used to detect the VOC content of the curing agent based on the physical volatilization reference value and measured gas concentration data of each curing reaction temperature zone at the current moment.

[0015] Thirdly, a server is provided, including a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, causing the device to perform the methods of the first aspect or any possible implementation thereof.

[0016] Fourthly, a computer program product is provided, comprising: computer program code, which, when run on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof.

[0017] Fifthly, a computer-readable storage medium is provided that stores computer program code, which, when executed on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof.

[0018] The present invention has the following beneficial effects: The present invention discloses a method for detecting the content of volatile organic compounds (VOCs) in a curing agent. By analyzing the no-load operation process, the physical volatilization process without chemical reaction, and the current curing reaction process of a tunnel oven, the method achieves the detection of VOC content in the curing agent, solves the technical problem of poor accuracy in detecting VOC content in curing agents, and improves the accuracy of VOC content detection in curing agents. Specifically, considering that the concentration signal in the same temperature zone lags behind the temperature signal on the time axis, this invention quantifies the gas transmission delay corresponding to different temperature zones by analyzing the no-load operation process of the target tunnel oven. Under certain circumstances, this can facilitate the subsequent time alignment of concentration and temperature. Secondly, by analyzing the physical volatilization operation process of the target tunnel oven without chemical reaction, and combining the gas transmission delay and Antoine's empirical formula, the comprehensive physical reference coefficient corresponding to the curing reaction temperature zone is quantified. Based on the temperature change in the solvent volatilization temperature zone during the current curing reaction operation of the target tunnel oven, as well as the gas transmission delay and Antoine's empirical formula, the current molar enthalpy of vaporization and the current pre-exponential factor are quantified, thereby quantifying the physical volatilization reference value of the curing reaction temperature zone at the current moment. Combined with the measured gas concentration data of the curing reaction temperature zone at the current moment, the content of organic volatiles in the curing agent is detected, which reduces the concentration interference caused by physical volatilization to a certain extent, thereby improving the accuracy of detecting the content of organic volatiles in the curing agent. Attached Figure Description

[0019] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of a method for detecting the content of volatile organic compounds in a curing agent according to the present invention; Figure 2This is a schematic diagram of the composition and structure of a system for detecting the content of volatile organic compounds in a curing agent according to the present invention; Figure 3 This is a schematic diagram of the structure of a computer device according to the present invention. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the technical solution proposed according to the present invention are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] refer to Figure 1 The flowchart illustrates some embodiments of a method for detecting the content of volatile organic compounds (VOCs) in a curing agent according to the present invention. This method for detecting the content of VOCs in a curing agent includes the following steps: Step S1: Based on the concentration changes of the tracer gas in the solvent evaporation temperature zone and each curing reaction temperature zone during the no-load operation of the target tunnel oven, determine the gas transmission delay corresponding to the solvent evaporation temperature zone and each curing reaction temperature zone.

[0024] The target tunnel oven can be the tunnel oven used for detecting the content of volatile organic compounds in the curing agent. Tunnel ovens are often continuous, through-type industrial drying or heating equipment, named for their tunnel-like shape and working principle. They are widely used in industrial fields requiring large-scale, continuous production. During no-load operation, the coating machine's transmission mechanism (such as rollers or conveyor belts) is in operation, but no material is being fed (i.e., no substrate foil or coating slurry is being placed), the entire oven is empty, and the exhaust fan can be turned on to the standard production airflow, but heating is not activated to maintain room temperature. The tracer gas can be a high-concentration gas pre-set for tracer purposes, such as standard isopropanol or high-purity nitrogen. The solvent evaporation temperature zone, also known as the inlet temperature zone, can have a heating temperature set below the chemical activation temperature of the curing agent (e.g., set to 60°C to 80°C). In this zone, the coating mainly undergoes physical evaporation of the solvent, without significant chemical cross-linking reactions. The temperature settings of different curing reaction zones are gradually increased to the curing temperature (e.g., 120°C to 160°C), where the coating often undergoes deep solvent evaporation and cross-linking reaction of the curing agent. Inside the oven along the coating line, the coating passes sequentially through the solvent evaporation temperature zone and different curing reaction temperature zones with gradually increasing temperature settings.

[0025] It should be noted that, since volatile organic compounds (VOCs) often need to be transported from inside the oven to a sensor located outside the duct via sampling pipelines, while temperature data is usually measured directly by thermocouples close to the coating surface, the concentration signal in the same temperature zone often lags behind the temperature signal on the time axis. To eliminate this phase difference, it is often necessary to pre-determine the gas transmission delay for each temperature zone.

[0026] As an example, this step may include the following steps: The first step is to designate the solvent evaporation temperature zone or any curing reaction temperature zone as the marked temperature zone. During the no-load operation of the target tunnel oven, tracer gas is injected into the sampling port of the marked temperature zone by opening the solenoid valve, and the concentration of tracer gas is collected in real time within the marked temperature zone.

[0027] The second step is to determine the opening time of the solenoid valve when the tracer gas is injected into the sampling port of the marked temperature zone as the first marking time.

[0028] It should be noted that at the internal sampling port of the marked temperature zone, a high concentration of tracer gas can be rapidly injected for a very short duration (such as 0.5 seconds) through a solenoid valve. The concentration of the tracer gas can be collected in real time by the corresponding gas concentration sensor, and the precise moment when the solenoid valve opens can be recorded as the first marking moment.

[0029] The third step is to determine the collection time corresponding to the maximum peak of all tracer gas concentrations collected within the marked temperature zone as the second marking time.

[0030] The fourth step is to determine the duration between the first and second marked times as the gas transmission delay corresponding to the marked temperature zone.

[0031] It should be noted that the gas transmission delay is mainly determined by the length of the sampling pipeline and the flow rate of the pump, and can be regarded as an inherent constant of the equipment.

[0032] Step S2: Based on the temperature and concentration changes in the solvent evaporation temperature zone and each curing reaction temperature zone during the physical evaporation operation of the target tunnel oven without chemical reaction, as well as the gas transport delay and Antoine's empirical formula, determine the comprehensive physical reference coefficient corresponding to each curing reaction temperature zone.

[0033] In the physical volatilization process without chemical reaction, the production line can be started and coated with resin slurry without added curing agent (or the entire furnace temperature can be set below the curing agent activation temperature, for example, 80 degrees Celsius for the entire line); and it can be run at the standard production line speed. In this case, only physical volatilization usually occurs throughout the line, without any chemical reaction. The duration of the physical volatilization process without chemical reaction can be preset according to the actual situation, and the physical volatilization process without chemical reaction is mainly used to eliminate the interference of physical volatilization.

[0034] As an example, this step may include the following steps: The first step is to acquire real-time temperature data and gas concentration data of the solvent evaporation temperature zone and each curing reaction temperature zone during the physical evaporation process without chemical reaction.

[0035] The measured temperature data can be obtained directly by thermocouples placed close to the coating surface. The measured gas concentration data can be the VOC (Volatile Organic Compounds) concentration collected by an online total hydrocarbon analyzer (such as an FID or PID sensor).

[0036] The second step, screening out the target stable operating process from the physical volatilization process without chemical reaction, may include the following sub-steps: The first sub-step involves determining the maximum value among the gas transport delays corresponding to the solvent evaporation temperature zone and all curing reaction temperature zones as the reference transport delay.

[0037] The second sub-step is to determine the sum of the above-mentioned reference transmission delay and the preset stable duration threshold as the target representative duration, and to determine the start time of the above-mentioned physical volatilization process without chemical reaction as the start reference time.

[0038] The preset stabilization time threshold can be a pre-set time based on the actual situation, which is considered to be the time when the concentration reading in the temperature zone reaches a relatively stable state. For example, it can be 5 minutes.

[0039] The third sub-step involves selecting, from the physical volatilization process without chemical reaction, moments whose duration between the starting reference moment and the target representative duration is equal to the aforementioned target segmentation moment.

[0040] The fourth sub-step involves dividing the physical volatilization process without chemical reaction into two sub-processes, using the aforementioned target segmentation time as the dividing point. The latest sub-process among these two sub-processes is then identified as the target stable operation process.

[0041] The third step involves defining each data acquisition moment during the stable operation of the aforementioned target as a temporary moment. Based on the measured temperature and gas concentration data of the solvent evaporation temperature range during the physical evaporation process without chemical reaction, as well as the gas transport delay and Antoine's empirical formula, determining the reference molar enthalpy of vaporization and the reference pre-exponential factor at each temporary moment may include the following sub-steps: The first sub-step involves determining the alignment temperature data of the solvent evaporation temperature zone at the data acquisition time during the physical evaporation process without chemical reaction, based on the gas transport delay corresponding to the solvent evaporation temperature zone. This results in the alignment temperature data of the solvent evaporation temperature zone at each temporary moment, which is recorded as the alignment evaporation temperature data at each temporary moment.

[0042] For example, determining the aligned temperature data at the data acquisition time during the physical evaporation process without chemical reaction in the solvent evaporation temperature zone, based on the gas transport delay corresponding to the solvent evaporation temperature zone, may include the following steps: First, any data acquisition moment during the physical volatilization process without chemical reaction is determined as a candidate moment, and the gas transmission delay corresponding to the solvent volatilization temperature zone is determined as the reference gas transmission delay.

[0043] Next, data acquisition times that occur before the aforementioned candidate times and whose duration between them and the aforementioned candidate times is equal to the aforementioned reference gas transmission delay are selected from the physical volatilization process without chemical reaction, and these times are used as the data alignment times corresponding to the aforementioned candidate times.

[0044] Finally, the measured temperature data of the solvent evaporation temperature zone at the data alignment time corresponding to the above candidate time is determined as the alignment temperature data of the solvent evaporation temperature zone at the above candidate time.

[0045] It should be noted that the aligned temperature data of the solvent evaporation temperature zone at the above candidate times can be matched with the measured gas concentration data of the solvent evaporation temperature zone at the above candidate times. That is, the hysteresis concentration reading is matched with the historical temperature at the time when the gas was generated, thereby restoring the physical state of the coating at that time on the time axis.

[0046] The second sub-step is to determine any temporary moment as a pending moment. If there are fewer than a preset number of temporary moments before the pending moment, the reference molar enthalpy of vaporization and the reference pre-exponential factor at the pending moment are set to the preset molar enthalpy of vaporization and the preset pre-exponential factor, respectively.

[0047] The preset quantity can be a quantity pre-set based on actual conditions, such as 300. The preset molar enthalpy of vaporization and the preset pre-exponential factor are respectively the molar enthalpy of vaporization and the pre-exponential factor pre-set based on actual conditions. For example, the preset molar enthalpy of vaporization and the preset pre-exponential factor can be derived from the historical production batch average of the solvent formulation, or set according to the standard Antoine constant of the main solvent component (such as NMP, butanone, etc.). The pre-exponential factor can be the intercept of the Antoine empirical formula; related to the pre-exponential factor, it reflects the base volatility of the solvent. The molar enthalpy of vaporization can be the slope of the Antoine empirical formula; related to the molar enthalpy of vaporization of the solvent, it often reflects the sensitivity of the evaporation rate to temperature changes.

[0048] For example, the formula corresponding to Antoine's empirical formula can be: ; in, C It refers to the gas concentration. It is an exponential function with the natural constant as its base. H It refers to the preceding factor. h It is the molar enthalpy of vaporization. t It's temperature. Representing absolute temperature, thermodynamic formulas often require the use of the absolute temperature scale.

[0049] The third sub-step is as follows: if there are a preset number of temporary moments before the aforementioned pending moment, and the variance of the aligned evaporation temperature data under the preset number of temporary moments closest to the aforementioned pending moment is less than a preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor under the aforementioned pending moment are respectively set as the reference molar enthalpy of vaporization and the reference pre-exponential factor under the previous temporary moment of the aforementioned pending moment.

[0050] The preset minimum regression incentive threshold can be a threshold set in advance based on the actual situation, such as 0.5.

[0051] It should be noted that if the variance of the aligned evaporation temperature data at the nearest preset number of temporary moments before the aforementioned pending moment is less than the preset minimum regression excitation threshold, it often indicates that the operating conditions are too stable and lack sufficient information to update the parameters. In this case, the subsequent regression calculation can be skipped, and the learning results of the previous moment can be used directly to maintain the stability of the model.

[0052] The fourth sub-step is as follows: If there are a preset number of temporary moments before the aforementioned pending moment, and the variance of the aligned evaporation temperature data at the preset number of temporary moments closest to the aforementioned pending moment is greater than or equal to a preset minimum regression excitation threshold, then based on the aligned evaporation temperature data and measured gas concentration data at the preset number of temporary moments closest to the aforementioned pending moment, the reference molar enthalpy of vaporization and the reference pre-exponential factor at the aforementioned pending moment are determined using the Antoine empirical formula.

[0053] For example, the aligned evaporation temperature data and measured gas concentration data at the nearest preset number of temporary moments before the aforementioned undetermined moment can be substituted into the Antoine empirical formula and solved by least squares to obtain the pre-exponential factor and molar enthalpy of vaporization of the Antoine empirical formula at this time, which can be used as the reference pre-exponential factor and reference molar enthalpy of vaporization at the undetermined moment.

[0054] It should be noted that if the variance of the aligned evaporation temperature data at the nearest preset number of temporary moments before the aforementioned pending moment is greater than or equal to the preset minimum regression excitation threshold, it often indicates that the data at this time has effective information and can be updated.

[0055] The fourth step is to determine the alignment temperature data of each curing reaction temperature zone at the data acquisition time during the physical volatilization process without chemical reaction, based on the gas transport delay corresponding to each curing reaction temperature zone, thereby obtaining the alignment temperature data of each curing reaction temperature zone at each temporary moment.

[0056] It should be noted that the method for obtaining the alignment temperature data at the time of data acquisition in the physical evaporation operation without chemical reaction in the curing reaction temperature zone can be the same as the method for obtaining the alignment temperature data at the time of data acquisition in the physical evaporation operation without chemical reaction in the solvent evaporation temperature zone, and will not be repeated here.

[0057] The fifth step is to determine the theoretical concentration value corresponding to each curing reaction temperature zone based on the average of the reference molar enthalpy of vaporization at all temporary times, the average of the reference pre-exponential factor at all temporary times, and the average of the aligned temperature data of each curing reaction temperature zone at all temporary times.

[0058] For example, the formula for determining the theoretical concentration value corresponding to the curing reaction temperature zone can be: ; in, It is the first i The theoretical concentration values ​​corresponding to each curing reaction temperature zone. i It is the serial number of the curing reaction temperature zone. It is an exponential function with the natural constant as its base. It is the mean of the reference exponential factor at all temporary times. It is the average of the reference molar enthalpy of vaporization at all temporary moments. It is the first i The mean of the aligned temperature data of the curing reaction zone at all temporary times.

[0059] It should be noted that, It can characterize the first part, which is forcibly derived from the physical formula calculated using the entrance region. i Theoretically, the VOC concentration that should be in a curing reaction temperature zone is often only considered in terms of temperature, without taking into account the decrease in solvent.

[0060] The sixth step is to determine the comprehensive physical reference coefficient for each curing reaction temperature zone based on the average of the measured gas concentration data at all temporary times for each curing reaction temperature zone and the theoretical concentration value corresponding to each curing reaction temperature zone.

[0061] For example, the formula for determining the comprehensive physical reference coefficient corresponding to the curing reaction temperature zone can be: ; in, It is the first i The comprehensive physical reference coefficient corresponding to each curing reaction temperature zone. i It is the serial number of the curing reaction temperature zone. It is the first i The mean of measured gas concentration data for each curing reaction temperature zone at all temporary times. It is the first i The theoretical concentration values ​​corresponding to each curing reaction temperature zone.

[0062] It should be noted that, It can characterize the first i The VOC concentrations were actually measured in each curing reaction temperature zone. It can characterize the first part, which is forcibly derived from the physical formula calculated using the entrance region. i Theoretically, the VOC concentration should be in a certain curing reaction temperature zone. However, this often only considers the temperature and not the decrease in solvent. Therefore, It can characterize the automatic "absorption" of all complex physical attenuation factors, becoming the benchmark correction quantity for subsequent differential calculations. For example, if... A value of 0.5 often indicates that in the first... i In the curing reaction zone, because the solvent is reduced or the air volume is increased, the actual concentration is only 50% of the pure theoretical value. In subsequent formal production, the calculated theoretical value is multiplied by 50%, and the resulting value can often characterize the physical background value.

[0063] Step S3: Based on the temperature changes in the solvent evaporation zone during the current curing reaction of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula, determine the current molar enthalpy of vaporization and the current pre-exponential factor.

[0064] The current curing reaction process can be the ongoing production process, excluding the initial oven startup phase. The end time of the current curing reaction process can be the current moment. The duration of the initial oven startup phase can be preset based on actual conditions; for example, it can be equal to the maximum value among the solvent evaporation temperature zone and the gas transport delay corresponding to all curing reaction temperature zones. In practice, during the initial oven startup phase, the coating machine is often not yet fully operational, and the data acquisition time at this point often lacks aligned temperature data, and the reference value of the data generated at this time is often low. Therefore, data acquisition can begin when the oven starts, but the volatile organic compound (VOC) content of the curing agent can be detected after the initial oven startup phase. In other words, the current moment can be the data acquisition time after the initial oven startup phase.

[0065] It should be noted that the no-load operation process, the physical volatilization operation process without chemical reaction, and the current curing reaction operation process are three independent operating processes. The no-load operation process and the physical volatilization operation process without chemical reaction are performed for parameter calculation and simulation before the current curing reaction operation process. Specifically, the no-load operation process is set up mainly to determine the gas transmission delay corresponding to different temperature zones, the physical volatilization operation process without chemical reaction is set up mainly to eliminate the interference of physical volatilization, and the current curing reaction operation process is the production process in which the content of organic volatiles in the curing agent is to be detected.

[0066] As an example, this step may include the following steps: The first step is to determine the aligned temperature data of the solvent evaporation temperature zone at each data acquisition moment during the current curing reaction, based on the gas transport delay corresponding to the solvent evaporation temperature zone.

[0067] It should be noted that the method for obtaining the alignment temperature data of the solvent evaporation temperature zone at the time of data acquisition during the current curing reaction operation can be the same as the method for obtaining the alignment temperature data of the solvent evaporation temperature zone at the time of data acquisition during the physical evaporation operation without chemical reaction, and will not be repeated here.

[0068] The second step is to determine any data acquisition time during the current curing reaction as the reference time. If there are fewer than a preset number of data acquisition times before the reference time during the current curing reaction, the reference molar enthalpy of vaporization and the reference pre-exponential factor at the reference time are set to the preset molar enthalpy of vaporization and the preset pre-exponential factor, respectively.

[0069] Third, if there are a preset number of data acquisition times before the reference time during the current solidification reaction operation, and the variance of the aligned volatilization temperature data at the preset number of data acquisition times closest to the reference time before the reference time is less than the preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor at the reference time are respectively set as the reference molar enthalpy of vaporization and the reference pre-exponential factor at the data acquisition time before the reference time.

[0070] Fourth step: If there are a preset number of data acquisition times before the above reference time, and the variance of the aligned volatilization temperature data at the preset number of data acquisition times closest to the above reference time before the above reference time is greater than or equal to the preset minimum regression excitation threshold, then based on the aligned volatilization temperature data and measured gas concentration data at the preset number of data acquisition times closest to the above reference time before the above reference time, the reference molar enthalpy of vaporization and the reference pre-exponential factor at the above reference time are determined using the Antoine empirical formula.

[0071] It should be noted that the methods for obtaining the reference molar enthalpy of vaporization and the reference pre-exponential factor at the reference time can be the same as those for obtaining the reference molar enthalpy of vaporization and the reference pre-exponential factor at the undetermined time, and will not be repeated here.

[0072] The fifth step is to obtain the reference molar enthalpy of vaporization and the reference pre-exponential factor at each data acquisition moment during the current curing reaction operation, and to determine the reference molar enthalpy of vaporization and the reference pre-exponential factor at the last data acquisition moment during the current curing reaction operation as the current molar enthalpy of vaporization and the current pre-exponential factor, respectively.

[0073] The current moment is the last data acquisition moment during the current curing reaction process.

[0074] Step S4: Based on the alignment temperature data of each curing reaction temperature zone obtained at the current moment during the current curing reaction operation of the target tunnel oven, the comprehensive physical reference coefficient, the current molar enthalpy of vaporization, and the current pre-exponential factor, determine the physical volatilization reference value of each curing reaction temperature zone at the current moment.

[0075] As an example, this step may include the following steps: The first step is to designate any curing reaction temperature zone as the marked curing reaction temperature zone, and to designate the gas transport delay corresponding to the marked curing reaction temperature zone as the marked curing reaction gas transport delay.

[0076] The second step is to take the data acquisition time before the current time, and the time between the current time and the current time being equal to the aforementioned mark solidification reaction gas transmission delay, as the target alignment time corresponding to the current time.

[0077] The third step is to determine the measured temperature data of the mark curing reaction temperature zone at the target alignment time corresponding to the current time as the alignment temperature data of the mark curing reaction temperature zone at the current time.

[0078] The fourth step is to determine the physical volatilization reference value of the marking and curing reaction temperature zone at the current moment based on the alignment temperature data of the marking and curing reaction temperature zone at the current moment, the comprehensive physical reference coefficient corresponding to the marking and curing reaction temperature zone, the current molar enthalpy of vaporization, and the current pre-exponential factor.

[0079] For example, the formula for determining the physical volatilization reference value of the marking curing reaction temperature zone at the current moment can be: ; in, A It is the physical volatilization reference value of the marking curing reaction temperature zone at the current moment. It is the comprehensive physical reference coefficient corresponding to the marking curing reaction temperature zone. It is an exponential function with the natural constant as its base. It is the current pre-exponential factor. It is the current molar enthalpy of vaporization. T It is the alignment temperature data of the marking curing reaction temperature zone at the current moment.

[0080] It should be noted that, It can characterize the automatic "absorption" of all complex physical attenuation factors, becoming the benchmark correction quantity for subsequent differential calculations. It can characterize the theoretical concentration value. Therefore, A It can characterize the amount of physical solvent evaporation.

[0081] Step S5: Detect the content of volatile organic compounds in the curing agent based on the physical volatilization reference value and measured gas concentration data of each curing reaction temperature zone at the current moment.

[0082] As an example, the organic volatile content index, which characterizes the organic volatile content of the curing agent, can be determined based on the difference between the measured gas concentration data of each curing reaction temperature zone at the current moment and the physical volatile reference value.

[0083] For example, the formula for determining the content of volatile organic compounds corresponding to the curing reaction temperature zone can be: ; ; in, It is the first i The organic volatile content index corresponding to each curing reaction temperature zone. i It is the serial number of the curing reaction temperature zone. It is the first i The increment of crosslinking reaction byproducts corresponding to each curing reaction temperature zone. It is the first i The measured gas concentration data for each curing reaction temperature zone at the current moment. It is the first i The physical volatilization reference value for each curing reaction temperature zone at the current moment. It is a function that takes the maximum value. It is an adjustment factor that is set in advance based on the actual situation. Here it is mainly used to prevent the denominator from being 0. For example, it can be 0.0001.

[0084] It should be noted that all variables in the embodiments of the present invention, especially the denominator, can be adjusted by adding corresponding adjustment factors according to the actual situation, so as to adjust their value range or prevent the denominator from being 0.

[0085] It should be noted that, It can characterize the first i The amount of physical solvent evaporation in each curing reaction temperature zone. It can characterize the first i The VOC concentrations were actually measured in each curing reaction temperature zone. It can characterize the content of volatile organic compounds released by the crosslinking reaction of the curing agent. Therefore, It can characterize the proportion of volatile organic compounds released by the cross-linking reaction of the curing agent, and to a certain extent, it can characterize the degree of volatile organic compound content released by the cross-linking reaction of the curing agent.

[0086] refer to Figure 2Based on the same inventive concept as the above-described method embodiments, this invention provides a system for detecting the content of volatile organic compounds in a curing agent, including a processor and a memory. The processor is used to process instructions stored in the memory to implement the steps of a method for detecting the content of volatile organic compounds in a curing agent, specifically including: The gas transmission delay determination module 201 is used to determine the gas transmission delay corresponding to the solvent evaporation temperature zone and each curing reaction temperature zone based on the concentration change of the tracer gas in the solvent evaporation temperature zone and each curing reaction temperature zone during the no-load operation of the target tunnel oven. The comprehensive physical reference coefficient determination module 202 is used to determine the comprehensive physical reference coefficient corresponding to each curing reaction temperature zone based on the temperature and concentration changes in the solvent evaporation temperature zone and each curing reaction temperature zone during the physical evaporation operation of the target tunnel oven without chemical reaction, as well as the gas transmission delay and Antoine's empirical formula. The molar enthalpy of vaporization and pre-exponential factor determination module 203 is used to determine the current molar enthalpy of vaporization and the current pre-exponential factor based on the temperature change in the solvent evaporation temperature zone during the current curing reaction operation of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula. The physical volatilization reference value determination module 204 is used to determine the physical volatilization reference value of each curing reaction temperature zone at the current moment based on the aligned temperature data, comprehensive physical reference coefficient, current molar enthalpy of vaporization and current pre-exponential factor obtained at the current moment for each curing reaction temperature zone during the current curing reaction operation of the target tunnel oven. The curing agent volatile organic compound content detection module 205 is used to detect the curing agent volatile organic compound content based on the physical volatilization reference value and measured gas concentration data of each curing reaction temperature zone at the current moment.

[0087] Figure 3 This is a schematic diagram of the structure of a computer device provided in an embodiment of the present invention. For example, as shown... Figure 3 As shown, the computer device 300 includes: a memory 301, a processor 302, and a computer program 303 stored in the memory 301 and running on the processor 302, wherein when the processor 302 executes the computer program 303, the computer device can perform any of the aforementioned methods for detecting the content of volatile organic compounds in a curing agent.

[0088] Based on the same inventive concept as the above-described method embodiments, the present invention provides a server, including a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, causing the device to perform any of the above-described methods for detecting the content of volatile organic compounds in curing agents.

[0089] Based on the same inventive concept as the above-described method embodiments, the present invention provides a computer program product comprising: computer program code, which, when run on a computer, causes the computer to execute any of the above-described methods for detecting the content of volatile organic compounds in a curing agent.

[0090] Based on the same inventive concept as the above-described method embodiments, the present invention provides a computer-readable storage medium storing computer program code, which, when executed on a computer, causes the computer to perform any of the above-described methods for detecting the content of volatile organic compounds in curing agents.

[0091] In summary, this invention quantifies the gas transport delay corresponding to different temperature zones by analyzing the no-load operation process of the target tunnel oven. Under certain circumstances, this facilitates the subsequent time alignment of concentration and temperature. Secondly, by analyzing the physical volatilization operation process of the target tunnel oven without chemical reaction, and combining the gas transport delay and Antoine's empirical formula, the comprehensive physical reference coefficient corresponding to the curing reaction temperature zone is quantified. Based on the temperature change in the solvent volatilization temperature zone during the current curing reaction operation of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula, the current molar enthalpy of vaporization and the current pre-exponential factor are quantified, thereby quantifying the physical volatilization reference value of the curing reaction temperature zone at the current moment. Combined with the measured gas concentration data of the curing reaction temperature zone at the current moment, the content of organic volatiles in the curing agent is detected, which to a certain extent reduces the concentration interference caused by physical volatilization, thereby improving the accuracy of detecting the content of organic volatiles in the curing agent.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for detecting the content of volatile organic compounds in a curing agent, characterized in that, Includes the following steps: Based on the concentration changes of tracer gas in the solvent evaporation temperature zone and each curing reaction temperature zone during the no-load operation of the target tunnel oven, the gas transmission delay corresponding to the solvent evaporation temperature zone and each curing reaction temperature zone is determined. Based on the temperature and concentration changes in the solvent evaporation temperature zone and each curing reaction temperature zone during the physical evaporation operation of the target tunnel oven without chemical reaction, as well as the gas transport delay and Antoine's empirical formula, the comprehensive physical reference coefficient corresponding to each curing reaction temperature zone is determined. Based on the temperature changes in the solvent evaporation zone during the current curing reaction operation of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula, determine the current molar enthalpy of vaporization and the current pre-exponential factor. Based on the aligned temperature data of each curing reaction temperature zone obtained at the current moment based on the gas transport delay, the comprehensive physical reference coefficient, the current molar enthalpy of vaporization, and the current pre-exponential factor obtained during the current curing reaction operation of the target tunnel oven, determine the physical volatilization reference value of each curing reaction temperature zone at the current moment; The content of volatile organic compounds in the curing agent was tested based on the physical volatile reference value and measured gas concentration data of each curing reaction temperature zone at the current moment.

2. The method for detecting the content of volatile organic compounds in a curing agent according to claim 1, characterized in that, The determination of the gas transport delay corresponding to the solvent evaporation temperature zone and each curing reaction temperature zone based on the concentration changes of the tracer gas in the solvent evaporation temperature zone and each curing reaction temperature zone during the no-load operation of the target tunnel oven includes: The solvent evaporation temperature zone or any curing reaction temperature zone is designated as the marked temperature zone. During the no-load operation of the target tunnel oven, tracer gas is injected into the sampling port of the marked temperature zone by opening the solenoid valve, and the concentration of tracer gas is collected in real time within the marked temperature zone. The opening time of the solenoid valve when the tracer gas is injected into the sampling port of the marked temperature zone is determined as the first marking time. The sampling time corresponding to the maximum peak of all tracer gas concentrations collected within the marked temperature zone is determined as the second marking time; The duration between the first marked time and the second marked time is determined as the gas transmission delay corresponding to the marked temperature zone.

3. The method for detecting the content of volatile organic compounds in a curing agent according to claim 1, characterized in that, The comprehensive physical reference coefficients for each curing reaction temperature zone are determined based on the temperature and concentration changes in the solvent evaporation temperature zone and each curing reaction temperature zone during the non-chemically reacting physical evaporation operation of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula. These coefficients include: Real-time acquisition of measured temperature data and measured gas concentration data of solvent evaporation temperature zone and each curing reaction temperature zone during the physical evaporation process without chemical reaction; Selecting the target stable operating process from the physical volatilization process without chemical reaction; Each data acquisition moment during the stable operation of the target is defined as a temporary moment. Based on the measured temperature data and measured gas concentration data of the solvent evaporation temperature zone during the physical evaporation process without chemical reaction, as well as the gas transport delay and Antoine's empirical formula, the reference molar enthalpy of vaporization and the reference pre-exponential factor at each temporary moment are determined. Based on the gas transport delay corresponding to each curing reaction temperature zone, the alignment temperature data of each curing reaction temperature zone at the data acquisition time during the physical volatilization process without chemical reaction is determined, thereby obtaining the alignment temperature data of each curing reaction temperature zone at each temporary moment. Based on the mean of the reference molar enthalpy of vaporization at all temporary moments, the mean of the reference pre-exponential factor at all temporary moments, and the mean of the aligned temperature data for each curing reaction temperature zone at all temporary moments, the theoretical concentration value corresponding to each curing reaction temperature zone is determined. Based on the average of the measured gas concentration data of each curing reaction temperature zone at all temporary times, and the theoretical concentration value corresponding to each curing reaction temperature zone, the comprehensive physical reference coefficient corresponding to each curing reaction temperature zone is determined.

4. The method for detecting the content of volatile organic compounds in a curing agent according to claim 3, characterized in that, The process of selecting a target stable operating process from a physical volatilization process without chemical reaction includes: The maximum value among the gas transport delays corresponding to the solvent evaporation temperature zone and all curing reaction temperature zones is determined as the reference transport delay; The sum of the reference transmission delay and the preset stable duration threshold is determined as the target representative duration, and the start time of the physical volatilization process without chemical reaction is determined as the start reference time. The time interval between the start reference time and the target representative time is selected from the physical volatilization process without chemical reaction as the target segmentation time; Using the target segmentation time as the segmentation point, the physical volatilization process without chemical reaction is divided into two sub-processes, and the latest sub-process among these two sub-processes is determined as the target stable operation process.

5. The method for detecting the content of volatile organic compounds in a curing agent according to claim 4, characterized in that, The determination of the reference molar enthalpy of vaporization and the reference pre-exponential factor at each temporary moment, based on measured temperature data and measured gas concentration data during the physical evaporation process without chemical reaction in the solvent evaporation temperature range, as well as gas transport delay and Antoine's empirical formula, includes: Based on the gas transport delay corresponding to the solvent evaporation temperature zone, the alignment temperature data of the solvent evaporation temperature zone at the data acquisition time during the physical evaporation process without chemical reaction is determined, thereby obtaining the alignment temperature data of the solvent evaporation temperature zone at each temporary moment, which is recorded as the alignment evaporation temperature data at each temporary moment. Any temporary moment is designated as a pending moment. If there are fewer than a preset number of temporary moments before the pending moment, the reference molar enthalpy of vaporization and the reference pre-exponential factor at the pending moment are set to the preset molar enthalpy of vaporization and the preset pre-exponential factor, respectively. If there are a preset number of temporary moments before the pending moment, and the variance of the aligned evaporation temperature data under the preset number of temporary moments closest to the pending moment is less than a preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor under the pending moment are respectively set as the reference molar enthalpy of vaporization and the reference pre-exponential factor under the previous temporary moment of the pending moment. If there are a preset number of temporary moments before the pending moment, and the variance of the aligned evaporation temperature data at the preset number of temporary moments closest to the pending moment is greater than or equal to a preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor at the pending moment are determined using the Antoine empirical formula based on the aligned evaporation temperature data at the preset number of temporary moments closest to the pending moment and the measured gas concentration data.

6. The method for detecting the content of volatile organic compounds in a curing agent according to claim 5, characterized in that, The step of determining the aligned temperature data of the solvent evaporation temperature zone at the data acquisition time during the physical evaporation process without chemical reaction, based on the gas transport delay corresponding to the solvent evaporation temperature zone, includes: Any data acquisition moment during the physical volatilization process without chemical reaction is determined as a candidate moment, and the gas transmission delay corresponding to the solvent volatilization temperature zone is determined as the reference gas transmission delay. The data acquisition time before the candidate time and with a duration equal to the reference gas transmission delay is selected from the physical volatilization process without chemical reaction and used as the data alignment time corresponding to the candidate time; The measured temperature data of the solvent evaporation temperature zone at the data alignment time corresponding to the candidate time is determined as the alignment temperature data of the solvent evaporation temperature zone at the candidate time.

7. The method for detecting the content of volatile organic compounds in a curing agent according to claim 1, characterized in that, The determination of the current molar enthalpy of vaporization and the current pre-exponential factor based on the temperature changes in the solvent evaporation zone during the current curing reaction operation of the target tunnel oven, as well as the gas transport delay and Antoine's empirical formula, includes: Based on the gas transport delay corresponding to the solvent evaporation temperature zone, determine the aligned temperature data of the solvent evaporation temperature zone at each data acquisition moment during the current curing reaction operation. Any data acquisition moment during the current curing reaction is determined as the reference moment. If there are fewer than a preset number of data acquisition moments before the reference moment during the current curing reaction, the reference molar enthalpy of vaporization and the reference pre-exponential factor at the reference moment are set to the preset molar enthalpy of vaporization and the preset pre-exponential factor, respectively. If there are a preset number of data acquisition times before the reference time during the current curing reaction, and the variance of the aligned volatilization temperature data at the preset number of data acquisition times closest to the reference time before the reference time is less than a preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor at the reference time are respectively set as the reference molar enthalpy of vaporization and the reference pre-exponential factor at the data acquisition time before the reference time. If there are a preset number of data acquisition times before the reference time, and the variance of the aligned volatilization temperature data at the preset number of data acquisition times closest to the reference time before the reference time is greater than or equal to a preset minimum regression excitation threshold, then the reference molar enthalpy of vaporization and the reference pre-exponential factor at the reference time are determined by the Antoine empirical formula based on the aligned volatilization temperature data and the measured gas concentration data at the preset number of data acquisition times closest to the reference time before the reference time. Thus, the reference molar enthalpy of vaporization and the reference pre-exponential factor at each data acquisition moment during the current curing reaction operation are obtained, and the reference molar enthalpy of vaporization and the reference pre-exponential factor at the last data acquisition moment during the current curing reaction operation are determined as the current molar enthalpy of vaporization and the current pre-exponential factor, respectively.

8. The method for detecting the content of volatile organic compounds in a curing agent according to claim 1, characterized in that, The method involves determining the physical volatilization reference value for each curing reaction temperature zone at the current moment based on the aligned temperature data obtained from the gas transport delay during the current curing reaction operation of the target tunnel oven, the comprehensive physical reference coefficient, the current molar enthalpy of vaporization, and the current pre-exponential factor, including: Any curing reaction temperature zone is designated as the marked curing reaction temperature zone, and the gas transport delay corresponding to the marked curing reaction temperature zone is designated as the marked curing reaction gas transport delay. The data acquisition time before the current time, and whose duration between the current time and the current time is equal to the mark solidification reaction gas transmission delay, will be used as the target alignment time corresponding to the current time. The measured temperature data of the mark curing reaction temperature zone at the target alignment time corresponding to the current time is determined as the alignment temperature data of the mark curing reaction temperature zone at the current time. Based on the alignment temperature data of the marking and curing reaction temperature zone at the current moment, the comprehensive physical reference coefficient corresponding to the marking and curing reaction temperature zone, the current molar enthalpy of vaporization and the current pre-exponential factor, determine the physical volatilization reference value of the marking and curing reaction temperature zone at the current moment.

9. The method for detecting the content of volatile organic compounds in a curing agent according to claim 1, characterized in that, The detection of volatile organic compound (VOC) content in the curing agent based on the physical volatile reference value and measured gas concentration data of each curing reaction temperature zone at the current moment includes: Based on the difference between the measured gas concentration data and the physical volatilization reference value at the current moment for each curing reaction temperature zone, the organic volatile content index, which characterizes the organic volatile content of the curing agent, is determined for each curing reaction temperature zone.

10. A system for detecting the content of volatile organic compounds in a curing agent, characterized in that, It includes a processor and a memory, the processor being used to process instructions stored in the memory to implement a method for detecting the content of volatile organic compounds in a curing agent according to any one of claims 1-9.

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