Method for end point control of polymerization of hydroxyl acrylic resins and use thereof

Abstract

The application discloses a kind of end point control method and application of hydroxy acrylic resin polymerization, belong to process control field, comprising the following steps: S1, server receives the set end point refractive index value, set end point refractive index value is recorded as target refractive index, i.e.nD 目 ;S4, server receives the real-time refractive index value of refractive index sensor, real-time refractive index value is recorded as nD 实 , C=nD 实 -nD 目 , server determines according to the relationship of the absolute value of C and threshold value.This application avoids that end point is identified too early or too late, thereby stably improves the overall performance of hydroxy acrylic resin product.

Description

Technical Field

[0001] This invention relates to the field of process control, and in particular to a method for controlling the endpoint of the polymerization reaction of hydroxyl acrylic resin and its application. Background Technology

[0002] Hydroxy acrylic resin is a high-performance synthetic resin for automotive coatings. The polymerization step in its production process is the key step to obtain high-performance synthetic resin automotive coatings. The existing polymerization reaction controls the endpoint by manually sampling and chemically analyzing the reactant residue of hydroxy acrylic resin. When the reactant residue of hydroxy acrylic resin is lower than the threshold, a terminator is added to terminate the reaction.

[0003] Existing methods for controlling the endpoint of polymerization reactions of hydroxyl acrylic resins have the following shortcomings: (1) Manual sampling and analysis are cumbersome and labor-intensive. Furthermore, due to the long time required for chemical analysis (including chromatographic analysis), the residual amount obtained from the analysis may differ from the actual residual amount in the reactor, resulting in the timing of the addition of the terminator being either too early or too late. (2) Although the terminator can terminate the polymerization reaction, as a material added outside the formulation, it introduces impurities into the hydroxyl acrylic resin product to varying degrees, thereby reducing the performance of the hydroxyl acrylic resin product.

[0004] The above background information is provided to facilitate understanding of the present invention and is not intended to be publicly known technology disclosed to the general public prior to the application of this invention. Summary of the Invention

[0005] To address the aforementioned deficiencies, this invention provides a method and application for controlling the endpoint of the polymerization reaction of hydroxyl acrylic resin. This method employs intelligent endpoint control, avoiding premature or late endpoint identification, thereby steadily improving the overall performance of hydroxyl acrylic resin products.

[0006] The technical solution is: a method for controlling the endpoint of the polymerization reaction of hydroxyl acrylic resin, comprising the following steps:

[0007] S1, The server receives the set endpoint refractive index value, which is recorded as the target refractive index, i.e., nD. 目 ;

[0008] S4, The server receives the real-time refractive index value from the refractive index sensor, and the real-time refractive index value is denoted as nD. 实 Let C = nD 实 -nD 目 The server makes a judgment based on the relationship between the absolute value of C and the threshold.

[0009] Furthermore, in S4, if the absolute value of C is within the threshold, the server sends a termination start command to the actuator of the termination droplet tube. The actuator of the termination droplet tube executes the command and drips the terminating agent into the reactor to terminate the reaction. If the absolute value of C is outside the threshold, the process continues until the absolute value of C is within the threshold.

[0010] Furthermore, S1 also includes: the server receiving a set endpoint viscosity window, which is denoted as the target viscosity window, i.e., μ. 目 In S4, if the absolute value of C is within the threshold, the server receives the real-time viscosity value from the viscosity sensor, and this real-time viscosity value is denoted as μ. 实 If μ 实 In μ 目 Inside, the server sends an opening command to the actuator of the termination droplet tube 1. The actuator of the termination droplet tube 1 executes the command and drips the terminating agent into the reaction vessel to terminate the reaction. If μ 实 In μ 目 In addition, the server outputs an alarm command; if the absolute value of C is outside the threshold, the process continues until the absolute value of C is within the threshold.

[0011] Furthermore, S1 also includes: the server receiving a set endpoint viscosity window, which is denoted as the target viscosity window, i.e., μ. 目 The server receives the set refractive index change rate window, and the set refractive index change rate is recorded as the target refractive index window, i.e., M. 目 The data includes S3, which is the refractive index of the refractive index sensor received by the server at the current moment, denoted as nD. (S1 and S4 are also included.) 实t , nD 实t =nD 实 The refractive index received by the server from the refractive index sensor at the previous moment is denoted as nD. 实（t-1） M 实 =nD 实t - nD 实（t-1） Comparison M 实 With M 目 If M 实 In M 目 Inside, maintain the initiator dropping rate, if M 实 In M 目 In addition, the server sends an adjustment command to the actuator of the initiator dripping tube, which adjusts the initiator dripping acceleration. In S4, the server continues to receive the real-time refractive index value from the refractive index sensor. If the absolute value of C is within the threshold, the server receives the real-time viscosity value from the viscosity sensor, which is recorded as μ. 实 If μ 实 In μ 目Inside, the server sends a shut-off command to the actuator of the initiator dripping tube. The actuator of the initiator dripping tube executes the command, stopping the dripping of initiator into the reactor. Simultaneously, the server sends an open command to the actuator of the terminator dripping tube. The actuator of terminator dripping tube 1 executes the command, dripping terminator into the reactor to terminate the reaction. If μ 实 In μ 目 In addition, the server outputs an alarm command; if the absolute value of C is outside the threshold, the process continues until the absolute value of C is within the threshold.

[0012] Furthermore, in S3, when M 实 In M 目 When outside, if M 实 Below M 目 The server sends an adjustment command to the actuator of the initiator dripping tube when the lower limit is reached, and the actuator increases the initiator dripping acceleration; if M 实 Higher than M 目 The server sends a command to the actuator of the initiator dripping tube to reduce the initiator dripping acceleration.

[0013] Furthermore, S1 also includes: the server receiving a set endpoint viscosity window, which is denoted as the target viscosity window, i.e., μ. 目 The server receives the set refractive index change rate window, and the set refractive index change rate is recorded as the target refractive index window, i.e., M. 目 The server also receives the set first oxygen content target value and second oxygen content target value, with the first oxygen content target value denoted as O. 目1 The second oxygen content target value is denoted as O. 目2 S1 and S4, including S2 and S3:

[0014] S2, The server receives the real-time oxygen content value from the oxygen sensor, and the real-time oxygen content value is recorded as O. 实 Comparison O 实 With O 目1 If O 实 ≤O 目1 The server sends a command to the actuator in the intake pipe to stop the nitrogen supply. The actuator in the intake pipe stops supplying nitrogen, and the server stops receiving the real-time oxygen content value from the oxygen sensor. If O 实 >O 目1 Nitrogen gas continues to be introduced through the intake manifold actuator;

[0015] S3, The server receives the real-time refractive index value from the refractive index sensor. The refractive index received by the server from the refractive index sensor at the current moment is denoted as nD. 实t , nD 实t =nD实 The refractive index received by the server from the refractive index sensor at the previous moment is denoted as nD. 实（t-1） M 实 =nD 实t - nD 实（t-1）， Compare M 实 With M 目 If M 实 In M 目 Inside, maintain the initiator dropping rate, if M 实 In M 目 In addition, the server sends an adjustment command to the actuator of the initiator dripping tube, and the actuator of the initiator dripping tube adjusts the initiator dripping acceleration;

[0016] In S4, the server continues to receive the real-time refractive index value from the refractive index sensor. If the absolute value of C is within the threshold, the server receives the real-time viscosity value from the viscosity sensor, which is denoted as μ. 实 If μ 实 In μ 目 Inside, the server sends a shut-off command to the actuator of the initiator dripping tube. The actuator executes the command, stopping the dripping of initiator into the reactor. Simultaneously, the server sends a command to the actuator of the air inlet pipe to introduce air or oxygen. The actuator executes the command to introduce air or oxygen into the reactor, terminating the reaction. The server continues to receive O2 signals from the oxygen sensor. 实 Comparison O 实 With O 目2 If O 实 ≧O 目2 The server sends a command to the actuator of the intake pipe to stop the supply of air or oxygen. The actuator of the intake pipe stops the supply of air or oxygen, and the server stops receiving the real-time oxygen content value from the oxygen sensor. If O 实 <O 目2 The intake manifold actuator continues to supply air or oxygen; if μ 实 In μ 目 In addition, the server outputs an alarm command, requiring manual intervention; if the absolute value of C is outside the threshold, the process continues until the absolute value of C is within the threshold.

[0017] Furthermore, the refractive index sensor is installed inside the bypass pipe, the viscosity sensor is installed in the turbulent zone generated by the agitator blades inside the reactor, and the oxygen sensor is installed above the liquid level, near the exhaust pipe.

[0018] The present invention also provides an electronic device.

[0019] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described method for controlling the endpoint of the polymerization reaction of hydroxyl acrylic resin.

[0020] Compared with the prior art, the principles and beneficial effects of the present invention are as follows:

[0021] In their production practice, the inventors discovered that during the formation reaction of hydroxyl acrylic resin, as the reactants of the hydroxyl acrylic resin are converted into products, the refractive index of the mixture undergoes a continuous and predictable change, and there is a good linear relationship between the refractive index and the conversion rate of the reactants. The inventors also found that during the formation reaction of hydroxyl acrylic resin, as the reactants of the hydroxyl acrylic resin are converted into products, the viscosity of the mixture undergoes a continuous and predictable change, and there is a good linear relationship between the viscosity and the conversion rate of the reactants.

[0022] This invention uses server monitoring to add viscosity identification to the endpoint identification based on refractive index, thus avoiding misjudgment.

[0023] This invention also controls the initiator's dripping rate via a server, keeping the reaction rate within an optimized range, thereby achieving the production of high-quality hydroxyl acrylic resin coatings.

[0024] This invention also utilizes the anaerobic nature of the hydroxyl acrylic resin formation reaction to monitor and control the atmosphere of the reactor via a server, thereby achieving the termination of the reaction without the use of a terminator. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the hydroxyl acrylic resin reaction vessel of the present invention;

[0026] Figure 2 This is a schematic flowchart of Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic flowchart of Embodiment 2 of the present invention;

[0028] Figure 4 This is a schematic flowchart of Embodiment 3 of the present invention;

[0029] In the diagram, 1 is the termination droplet tube, 2 is the product discharge tube, 3 is the air inlet tube, 4 is the exhaust tube, 5 is the bypass tube, 6 is the refractive index sensor, 7 is the viscosity sensor, 8 is the oxygen sensor, and 9 is the initiator droplet tube. Detailed Implementation

[0030] The technical solution of the present invention will be described in detail below with specific embodiments. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention and not for limiting the claims of the present invention.

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0033] Unless otherwise specified, all inventions are existing technologies.

[0034] Please refer to Figure 1 , Figure 1 The diagram shows the structure of the hydroxy acrylic resin reactor of the present invention. In the present invention, the hydroxy acrylic resin reactor is equipped with a termination liquid dripping pipe 1, an initiator dripping pipe 9, a product discharge pipe 2, an air inlet pipe 3, an exhaust pipe 4, and a bypass pipe 5.

[0035] The refractive index sensor 6 is installed inside the bypass pipe 5. The purpose of this installation is to accurately measure the refractive index under constant temperature, constant pressure, and bubble-free conditions. The viscosity sensor 7 is installed in the turbulent zone generated by the agitator blades inside the reactor. The purpose of this installation is to avoid reading fluctuations, data failure due to bubbles, or data lag.

[0036] The oxygen sensor 8 is installed above the liquid level, near the exhaust pipe 4. The purpose of this installation is to monitor the overall atmosphere quickly and accurately.

[0037] Example 1

[0038] Please refer to Figures 1-2 , Figure 2 This is a flowchart of this embodiment.

[0039] A method for controlling the endpoint of a polymerization reaction of a hydroxyl acrylic resin, comprising the following steps:

[0040] S1, The server receives the set endpoint refractive index value, which is recorded as the target refractive index, i.e., nD. 目 .

[0041] S4, The server receives the real-time refractive index value from the refractive index sensor 6, and the real-time refractive index value is recorded as nD. 实 Let C = nD 实 -nD 目If the absolute value of C is within the threshold, the server sends a termination start command to the actuator of the termination droplet tube 1. The actuator of the termination droplet tube 1 executes the command and drips the terminating agent into the reactor to terminate the reaction. If the absolute value of C is outside the threshold, the process continues until the absolute value of C is within the threshold.

[0042] To more accurately determine the endpoint and prevent misjudgment, in one specific application of this embodiment, S1 further includes the server receiving a set endpoint viscosity window, which is denoted as the target viscosity window, i.e., μ. 目 In S4, when the absolute value of C is within the threshold, the server receives the real-time viscosity value from the viscosity sensor 7, and the real-time viscosity value is recorded as μ. 实 If μ 实 In μ 目 Inside, the server sends an opening command to the actuator of the termination droplet tube 1. The actuator of the termination droplet tube 1 executes the command and drips the terminating agent into the reaction vessel to terminate the reaction. If μ 实 In μ 目 In addition, the server outputs alarm commands, requiring manual intervention.

[0043] In one specific application implementation of this embodiment, n 目 Set to 1.4413, μ 目 The settings are 3000 mPa·s to 5000 mPa·s.

[0044] Example 2

[0045] Although Example 1 can automatically and accurately identify the timing of the terminating agent addition, in the formation reaction of hydroxyacrylic resin, both excessively fast and excessively slow reactions affect the quality of the final product. The reaction speed is controlled by the addition of the initiator. In the existing method, the initiator is added manually in batches, which affects the quality of the final product.

[0046] In the formation reaction of hydroxyl acrylic resin, the refractive index of the mixture increases as the amount of reactants decreases.

[0047] Based on Example 1, this embodiment controls the reaction rate within an optimized range by controlling the dripping rate of the initiator, thereby achieving the production of high-quality hydroxyl acrylic resin coatings.

[0048] Please refer to Figure 1 and Figure 3 , Figure 3 This is a flowchart of this embodiment.

[0049] A method for controlling the endpoint of a polymerization reaction of a hydroxyl acrylic resin, comprising the following steps:

[0050] S1, The server receives the set endpoint refractive index value, which is recorded as the target refractive index, i.e., nD. 目 The server receives the set endpoint viscosity window, which is denoted as the target viscosity window, i.e., μ. 目 The server receives the set refractive index change rate window, and the set refractive index change rate is recorded as the target refractive index window, i.e., M. 目 .

[0051] S3, The server receives the real-time refractive index value from the refractive index sensor 6, and the real-time refractive index value is denoted as nD. 实 The refractive index of the refractive index sensor 6 received by the server at the current moment is denoted as nD. 实t , nD 实t =nD 实 The refractive index of the refractive index sensor 6 received by the server at the previous moment is denoted as nD. 实（t-1） M 实 =nD 实t - nD 实（t-1）， Compare M 实 With M 目 If M 实 In M 目 Inside, maintain the initiator dropping rate, if M 实 In M 目 In addition, the server sends an adjustment command to the actuator of the initiator dripping tube 9, and the actuator of the initiator dripping tube 9 adjusts the initiator dripping acceleration.

[0052] S4, the server continues to receive the real-time refractive index value from refractive index sensor 6, let C=nD 实 -nD 目 If the absolute value of C is within the threshold, the server receives the real-time viscosity value from the viscosity sensor 7, and the real-time viscosity value is recorded as μ. 实 If μ 实 In μ 目 Inside, the server sends a shut-off command to the actuator of the initiator dripping tube 9. The actuator of the initiator dripping tube 9 executes the command, stopping the dripping of initiator into the reactor. Simultaneously, the server sends an open command to the actuator of the terminator dripping tube 1. The actuator of the terminator dripping tube 1 executes the command, dripping terminator into the reactor to terminate the reaction. If μ 实 In μ 目 In addition, the server outputs an alarm command, requiring manual intervention; if the absolute value of C is outside the threshold, the process continues until the absolute value of C is within the threshold.

[0053] Furthermore, in S4, when M 实 In M 目 When outside, if M 实 Below M 目The server sends an adjustment command to the actuator of the initiator dripping tube 9, which increases the initiator dripping acceleration; if M 实 Higher than M 目 The server sends a command to the actuator of the initiator dripping tube 9 to reduce the initiator dripping acceleration.

[0054] Example 3

[0055] Although Example 2 achieved the production of high-quality hydroxyl acrylic resin coatings, it still did not solve the problem of terminator in the background art.

[0056] Please refer to Figure 1 and Figure 4 , Figure 4 This is a flowchart of this embodiment.

[0057] A method for controlling the endpoint of a polymerization reaction of a hydroxyl acrylic resin, comprising the following steps:

[0058] S1, The server receives the set endpoint refractive index value, which is recorded as the target refractive index, i.e., nD. 目 The server receives the set endpoint viscosity window, which is denoted as the target viscosity window, i.e., μ. 目 The server receives the set refractive index change rate window, and the set refractive index change rate is recorded as the target refractive index window, i.e., M. 目 The server also receives the set first oxygen content target value and second oxygen content target value, with the first oxygen content target value denoted as O. 目1 The second oxygen content target value is denoted as O. 目2 .

[0059] S2, The server receives the real-time oxygen content value from oxygen sensor 8, and the real-time oxygen content value is recorded as O. 实 Comparison O 实 With O 目1 If O 实 ≤O 目1 The server sends a command to the actuator of intake pipe 3 to stop the supply of nitrogen. The actuator of intake pipe 3 stops supplying nitrogen, and the server stops receiving the real-time oxygen content value from oxygen sensor 8. If O 实 >O 目1 Nitrogen gas continues to be introduced into the actuator of intake pipe 3.

[0060] S3, The server receives the real-time refractive index value from the refractive index sensor 6, and the real-time refractive index value is denoted as nD. 实 The refractive index of the refractive index sensor 6 received by the server at the current moment is denoted as nD. 实tThe refractive index of the refractive index sensor 6 received by the server at the previous moment is denoted as nD. 实（t-1） M 实 =nD 实t - nD 实（t-1）， Compare M 实 With M 目 If M 实 In M 目 Inside, maintain the initiator dropping rate, if M 实 In M 目 In addition, the server sends an adjustment command to the actuator of the initiator dripping tube 9, and the actuator of the initiator dripping tube 9 adjusts the initiator dripping acceleration.

[0061] S4, the server continues to receive the real-time refractive index value from refractive index sensor 6, let C=nD 实t -nD 目 If the absolute value of C is within the threshold, the server receives the real-time viscosity value from the viscosity sensor 7, and the real-time viscosity value is recorded as μ. 实 If μ 实 In μ 目 Inside, the server sends a shut-off command to the actuator of the initiator dripping pipe 9. The actuator of the initiator dripping pipe 9 executes the command, stopping the dripping of initiator into the reactor. Simultaneously, the server sends a command to the actuator of the air inlet pipe 3 to introduce air or oxygen. The actuator of the air inlet pipe 3 executes the command to introduce air or oxygen into the reactor, terminating the reaction. The server continues to receive O2 signals from the oxygen sensor 8. 实 Comparison O 实 With O 目2 If O 实 ≧O 目2 The server sends a command to the actuator of the intake pipe 3 to stop the supply of air or oxygen. The actuator of the intake pipe 3 stops the supply of air or oxygen, and the server stops receiving the real-time oxygen content value from the oxygen sensor 8. If O 实 <O 目2 The actuator of intake pipe 3 continues to supply air or oxygen; if μ 实 In μ 目 In addition, the server outputs an alarm command, requiring manual intervention; if the absolute value of C is outside the threshold, the process continues until the absolute value of C is within the threshold.

[0062] Furthermore, in S4, when M 实 In M 目 When outside, if M 实 Below M 目 The server sends an adjustment command to the actuator of the initiator dripping tube 9, which increases the initiator dripping acceleration; if M 实 Higher than M 目The server sends a command to the actuator of the initiator dripping tube 9 to reduce the initiator dripping acceleration.

[0063] In one specific application embodiment of this example, when the reaction is terminated, air is introduced into the reaction vessel through the air inlet pipe 3, and the set O 目1 =10ppm, set O 目2 =20.9% (v / v).

[0064] An electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the endpoint control method for the polymerization reaction of any one of Examples 1-3 of the hydroxyl acrylic resin.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling the endpoint of the polymerization reaction of a hydroxyl acrylic resin, characterized in that, Includes the following steps: S1, The server receives the set endpoint refractive index value, which is recorded as the target refractive index, i.e., nD. 目 ; S4, The server receives the real-time refractive index value from the refractive index sensor, and the real-time refractive index value is denoted as nD. 实 Let C = nD 实 -nD 目 The server makes a judgment based on the relationship between the absolute value of C and the threshold. S1 also includes: the server receiving the set endpoint viscosity window, which is denoted as the target viscosity window, i.e., μ. 目 The server receives the set refractive index change rate window, and the set refractive index change rate is recorded as the target refractive index window, i.e., M. 目 The data includes S3, which is the refractive index of the refractive index sensor received by the server at the current moment, denoted as nD. (S1 and S4 are also included.) 实t , nD 实t =nD 实 The refractive index received by the server from the refractive index sensor at the previous moment is denoted as nD. 实（t-1） M 实 =nD 实t -nD 实（t-1） Comparison M 实 With M 目 If M 实 In M 目 Inside, maintain the initiator dropping rate, if M 实 In M 目 In addition, the server sends an adjustment command to the actuator of the initiator dripping tube, which adjusts the initiator dripping acceleration. In S4, the server continues to receive the real-time refractive index value from the refractive index sensor. If the absolute value of C is within the threshold, the server receives the real-time viscosity value from the viscosity sensor, which is recorded as μ. 实 If μ 实 In μ 目 Inside, the server sends a shut-off command to the actuator of the initiator dripping tube, which executes the command to stop dripping the initiator into the reactor. Simultaneously, the server sends an open command to the actuator of the stop liquid dripping tube, which executes the command to drip the stop agent into the reactor to terminate the reaction. If μ 实 In μ 目 In addition, the server outputs an alarm command; if the absolute value of C is outside the threshold, the process continues until the absolute value of C is within the threshold.

2. The method for controlling the endpoint of the polymerization reaction of hydroxyl acrylic resin according to claim 1, characterized in that, In S3, when M 实 In M 目 When outside, if M 实 Below M 目 If M reaches its lower limit, the server sends an adjustment command to the actuator of the initiator dripping tube, and the actuator increases the initiator dripping acceleration; if M... 实 Higher than M 目 The server sends a command to the actuator of the initiator dripping tube to reduce the initiator dripping acceleration.

3. The method for controlling the endpoint of the polymerization reaction of the hydroxyl acrylic resin according to any one of claims 1-2, characterized in that, The refractive index sensor is installed inside the bypass pipe, and the viscosity sensor is installed in the turbulent zone generated by the agitator blades inside the reactor.

4. A method for controlling the endpoint of the polymerization reaction of a hydroxyl acrylic resin, characterized in that, Includes the following steps: S1, The server receives the set endpoint refractive index value, which is recorded as the target refractive index, i.e., nD. 目 ; S4, The server receives the real-time refractive index value from the refractive index sensor, and the real-time refractive index value is denoted as nD. 实 Let C = nD 实 -nD 目 The server makes a judgment based on the relationship between the absolute value of C and the threshold. S1 also includes: the server receiving the set endpoint viscosity window, which is denoted as the target viscosity window, i.e., μ. 目 The server receives the set refractive index change rate window, and the set refractive index change rate is recorded as the target refractive index window, i.e., M. 目 The server also receives the set first oxygen content target value and second oxygen content target value, with the first oxygen content target value denoted as O. 目1 The second oxygen content target value is denoted as O. 目2 ; S1 and S4, including S2 and S3: S2, The server receives the real-time oxygen content value from the oxygen sensor, and the real-time oxygen content value is recorded as O. 实 Comparison O 实 With O 目1 If O 实 ≤O 目1 The server sends a command to the actuator in the intake pipe to stop the nitrogen supply. The actuator in the intake pipe stops supplying nitrogen, and the server stops receiving the real-time oxygen content value from the oxygen sensor. If O 实 >O 目1 Nitrogen gas continues to be introduced through the intake manifold actuator; S3, The server receives the real-time refractive index value from the refractive index sensor. The refractive index received by the server from the refractive index sensor at the current moment is denoted as nD. 实t , nD 实t =nD 实 The refractive index received by the server from the refractive index sensor at the previous moment is denoted as nD. 实（t-1） M 实 =nD 实t - nD 实（t-1）， Compare M 实 With M 目 If M 实 In M 目 Inside, maintain the initiator dropping rate, if M 实 In M 目 In addition, the server sends an adjustment command to the actuator of the initiator dripping tube, and the actuator of the initiator dripping tube adjusts the initiator dripping acceleration; In S4, the server continues to receive the real-time refractive index value from the refractive index sensor. If the absolute value of C is within the threshold, the server receives the real-time viscosity value from the viscosity sensor, which is denoted as μ. 实 If μ 实 In μ 目 Inside, the server sends a shut-off command to the actuator of the initiator dripping tube. The actuator executes the command, stopping the dripping of initiator into the reactor. Simultaneously, the server sends a command to the actuator of the air inlet pipe to introduce air or oxygen. The actuator executes the command to introduce air or oxygen into the reactor, terminating the reaction. The server continues to receive O2 signals from the oxygen sensor. 实 Comparison O 实 With O 目2 If O 实 ≧O 目2 The server sends a command to the actuator of the intake pipe to stop the supply of air or oxygen. The actuator of the intake pipe stops the supply of air or oxygen, and the server stops receiving the real-time oxygen content value from the oxygen sensor. If O 实 <O 目2 The intake manifold actuator continues to supply air or oxygen; if μ 实 In μ 目 In addition, the server outputs an alarm command, requiring manual intervention; if the absolute value of C is outside the threshold, the process continues until the absolute value of C is within the threshold.

5. The method for controlling the endpoint of the polymerization reaction of hydroxyl acrylic resin according to claim 4, characterized in that, The refractive index sensor is installed inside the bypass pipe, the viscosity sensor is installed in the turbulent zone generated by the agitator blades inside the reactor, and the oxygen sensor is installed above the liquid level, near the exhaust pipe.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the endpoint control method for the polymerization reaction of hydroxyl acrylic resin as described in any one of claims 1 to 5.

Images