Conductive paste mixing and dispersing production cooperative automatic control method

Abstract

The present application relates to the technical field of conductive paste mixing and dispersion production, in particular to a kind of conductive paste mixing and dispersion production synergistic automation control method, it is first to metal powder raw material and is mixed and dispersed pretreatment, obtain metal powder slurry, then metal powder slurry is input to roller press and is ground, afterwards according to grinding parameter dynamic adjustment mixing and dispersion pretreatment parameter, finally to the slurry of grinding and is processed, obtain conductive paste.Mixing and dispersion pretreatment includes physical pretreatment and chemical pretreatment.The present application introduces the dynamic mixing and dispersion pretreatment link containing the synergistic action of physical dispersion and chemical additive on the upstream of roller grinding process, and constructs the closed-loop control mechanism based on grinding parameter feedback, realizes the active compensation and inhibition to nonlinear disturbance factor from root source.Solve the mechanical nonlinear problem of roller press in the mixing and dispersion production process of conductive paste in the prior art.

Description

Technical Field

[0001] This invention relates to the field of conductive slurry mixing and dispersion production technology, and specifically to a collaborative automated control method for conductive slurry mixing and dispersion production. Background Technology

[0002] The preparation process of conductive paste generally includes steps such as ingredient premixing, wet grinding and dispersion, homogenization and degassing, and filtration and filling. Among these, the grinding and dispersion step is the core step that determines the particle size distribution and dispersion stability of conductive metal powders (such as silver powder and copper powder) in the paste. In this step, the industry widely uses roller presses such as three-roll mills to perform high-shear treatment on the materials. The strong shear force generated by the different speed ratios between different rollers and the micron-level gaps deagglomerates the metal powder particles and disperses them uniformly in the organic carrier.

[0003] However, in actual production, the three-roll mill exhibits a significant "pressure-gap" mechanical nonlinearity under continuous high-load operation, severely restricting the batch consistency of conductive paste and the safety of equipment operation. Specifically, due to the heat generated by high-speed shearing friction, the roller surface experiences significant thermal expansion. At this time, there is a slight dead zone between the actual position feedback of the servo motor and the command. If the command is forcibly executed, it will cause the roller surface to directly crush large metal particles, resulting in wire-drawing damage to the precision chromium plating layer of the roller surface. The damaged area will become a source of contamination for metal debris in subsequent batches, causing quality defects.

[0004] Therefore, there is a need for a collaborative automated control method for the production of conductive slurry mixing and dispersion to solve the mechanical nonlinearity problem of the roller press in the existing conductive slurry mixing and dispersion production process. Summary of the Invention

[0005] The purpose of this invention is to provide a collaborative automated control method for the mixing and dispersion production of conductive slurry, thereby solving the following technical problems:

[0006] Mechanical nonlinearity issues of roller presses in the production process of conductive slurry mixing and dispersion in existing technologies.

[0007] The objective of this invention can be achieved through the following technical solutions: A method for coordinated automated control of conductive paste mixing and dispersion production includes the following steps: Based on the mixing and dispersion pretreatment parameters, the metal powder raw material is subjected to mixing and dispersion pretreatment to obtain a metal powder slurry; Metal powder slurry is fed into a roller press for grinding to obtain grinding slurry; Monitor the grinding parameters during grinding and dynamically adjust the mixing and dispersion pretreatment parameters based on the grinding parameters; The grinding slurry is processed to obtain a conductive slurry; The mixed dispersion pretreatment includes physical pretreatment and chemical pretreatment. The parameters of the mixed dispersion pretreatment include physical parameters and chemical parameters. The physical pretreatment includes dispersing the metal powder raw material. The physical parameters are used to control the physical pretreatment. The chemical pretreatment includes adding chemical additives. The chemical additives are used to improve the dispersion effect of the metal powder raw material in the metal powder slurry. The chemical parameters include the amount of chemical additives added.

[0008] In a preferred embodiment, the physical pretreatment includes primary homogenization, temperature-controlled stirring, and ultrasonic dispersion.

[0009] In a preferred embodiment: monitoring grinding parameters during grinding and dynamically adjusting mixing and dispersion pretreatment parameters based on the grinding parameters, including: By monitoring the grinding parameters during grinding, the pressure variation coefficient and subsequent particle size deviation during grinding can be obtained. The quality indicators of the slurry entering the roller press are obtained based on the pressure variation coefficient and the particle size deviation of the subsequent stage. Based on the quality index of the slurry at the roller press inlet, and using multi-level index thresholds, the physical parameters are dynamically adjusted.

[0010] In a preferred embodiment: based on the quality index of the slurry at the roller press inlet, and using multi-level index thresholds, the physical parameters are dynamically adjusted, including: Comparing the quality indicators of the slurry at the roller press inlet with the multi-level indicator thresholds, the multi-level indicator thresholds include the first-level indicator threshold, the second-level indicator threshold, and the third-level indicator threshold, which increase sequentially. If the quality index of the slurry at the roller press inlet is less than the threshold of the first-level index, then increase the homogenization speed used for primary homogenization in the physical parameters, and at the same time adjust the stirring temperature used for temperature control in the physical parameters. If the primary homogenization rotation speed reaches the upper limit, then increase the ultrasonic treatment time used for ultrasonic dispersion in the physical parameters. If the quality index of the slurry at the roller press inlet is not less than the first-level index threshold and less than the second-level index threshold, then the physical parameters shall be maintained. If the quality index of the slurry at the roller press inlet is not less than the secondary index threshold, then reduce the homogenization speed.

[0011] In a preferred embodiment: the chemical additives include dispersants and coupling agents; monitoring grinding parameters during grinding and dynamically adjusting mixing and dispersion pretreatment parameters based on the grinding parameters includes: By monitoring the grinding parameters during grinding, the pressure variation coefficient during grinding is obtained; Adjust the amount of dispersant added according to the pressure variation coefficient and add it accordingly; After adding the dispersant, the grinding parameters for multiple grinding cycles were obtained; If the grinding parameters for multiple grinding cycles do not meet the preset response standard, adjust the amount of coupling agent added and add it.

[0012] In a preferred embodiment: adjusting and adding the corresponding amount of coupling agent includes: By monitoring the grinding parameters during grinding, the particle size distribution of the subsequent stages during grinding can be obtained; Adjust the amount of coupling agent added according to the particle size distribution of the downstream particles and add it accordingly.

[0013] In a preferred embodiment: the chemical additive includes a rheology modifier; monitoring the grinding parameters during grinding and dynamically adjusting the mixing and dispersion pretreatment parameters according to the grinding parameters includes: By monitoring the grinding parameters during grinding, the density difference and feeding rate of different feed troughs of the roller press can be obtained; If the density difference between different feed troughs of the roller press exceeds the preset density difference threshold, the amount of rheology modifier to be added is determined according to the feed rate and then added.

[0014] In a preferred embodiment: the chemical additive includes a pH adjuster; monitoring grinding parameters during grinding and dynamically adjusting mixing and dispersion pretreatment parameters based on the grinding parameters includes: By monitoring the grinding parameters during grinding, the particle size of the subsequent grinding stage can be obtained; Based on the subsequent particle size, the particle size increment index is obtained; If the particle size increment index exceeds the preset increment threshold, adjust the amount of pH adjuster accordingly and add it.

[0015] In a preferred embodiment: the chemical additive includes at least one of a dispersant, a coupling agent, a rheology modifier, and a pH adjuster; the dispersant includes at least one of a polymeric dispersant and anionic dispersant; the coupling agent includes at least one of a silane coupling agent and a titanate coupling agent; the rheology modifier includes at least one of an organobentonite, hydrogenated castor oil, and polyamide wax; and the pH adjuster includes at least one of an organic amine and acetic acid.

[0016] A collaborative automated control system for the mixing and dispersion production of conductive paste includes: The dynamic pretreatment unit is used to perform mixed dispersion pretreatment on metal powder raw materials based on mixed dispersion pretreatment parameters to obtain metal powder slurry; The grinding unit is used to feed metal powder slurry into a roller press for grinding to obtain grinding slurry; The dynamic adjustment unit is used to monitor the grinding parameters during grinding and dynamically adjust the mixing and dispersion pretreatment parameters according to the grinding parameters; The production unit is used to process the grinding slurry to obtain a conductive slurry; The mixed dispersion pretreatment includes physical pretreatment and chemical pretreatment. The parameters of the mixed dispersion pretreatment include physical parameters and chemical parameters. The physical pretreatment includes dispersing the metal powder raw material. The physical parameters are used to control the physical pretreatment. The chemical pretreatment includes adding chemical additives. The chemical additives are used to improve the dispersion effect of the metal powder raw material in the metal powder slurry. The chemical parameters include the amount of chemical additives added.

[0017] The beneficial effects of this invention are: This invention provides a collaborative automated control method for the mixing and dispersion production of conductive slurry. First, based on mixing and dispersion pretreatment parameters, metal powder raw materials are subjected to mixing and dispersion pretreatment to obtain a metal powder slurry. Then, the metal powder slurry is fed into a roller press for grinding to obtain a ground slurry. Next, the grinding parameters during grinding are monitored, and the mixing and dispersion pretreatment parameters are dynamically adjusted based on these parameters. Finally, the ground slurry is processed to obtain a conductive slurry. The mixing and dispersion pretreatment includes physical pretreatment and chemical pretreatment. The mixing and dispersion pretreatment parameters include physical parameters and chemical parameters. Physical pretreatment includes dispersing the metal powder raw materials, and the physical parameters are used to control the physical pretreatment. Chemical pretreatment includes adding chemical additives to improve the dispersion effect of the metal powder raw materials in the metal powder slurry. The chemical parameters include the amount of chemical additives added. This invention introduces a dynamic mixing and dispersion pretreatment step upstream of the roller pressing and grinding process, incorporating the synergistic effect of physical dispersion and chemical additives, and constructs a closed-loop control mechanism based on grinding parameter feedback, achieving proactive compensation and suppression of nonlinear disturbance factors at their source. Specifically, this invention avoids forcibly driving a servo mechanism already at its physical limits. Instead, it optimizes the agglomeration of metal powder, thereby reducing the hard impact load on the roller surface during grinding. Simultaneously, by precisely controlling the amount of chemical additives, it improves the wettability and suspension stability of the metal powder in the carrier, reducing the internal friction coefficient of the slurry and the heat generated during grinding. This synergistic control strategy allows the roller press to operate stably within a relatively larger safety clearance range, significantly reducing the phenomenon of large metal powder particles being directly crushed by the roller surface due to forced gap pressing. This eliminates the risk of chromium plating layer wire drawing damage and subsequent batch metal debris contamination from the source. It also solves the mechanical nonlinearity problem of roller presses in the existing conductive slurry mixing and dispersion production process. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a flowchart of the method for the coordinated automated control of conductive paste mixing and dispersion production according to the present invention; Figure 2 This is a schematic diagram of the production line for the automated control method of conductive paste mixing and dispersing production according to the present invention. Figure 3 This is a system architecture diagram of the conductive slurry mixing and dispersion production collaborative automated control system of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 This invention provides a method for the coordinated automated control of conductive slurry mixing and dispersion production, comprising the following steps: S101. Based on the mixing and dispersion pretreatment parameters, the metal powder raw material is subjected to mixing and dispersion pretreatment to obtain a metal powder slurry; S102. The metal powder slurry is fed into a roller press for grinding to obtain a grinding slurry; S103. Monitor the grinding parameters during grinding and dynamically adjust the mixing and dispersion pretreatment parameters according to the grinding parameters; S104. Process the grinding slurry to obtain a conductive slurry; The mixed dispersion pretreatment includes physical pretreatment and chemical pretreatment. The parameters of the mixed dispersion pretreatment include physical parameters and chemical parameters. The physical pretreatment includes dispersing the metal powder raw material. The physical parameters are used to control the physical pretreatment. The chemical pretreatment includes adding chemical additives. The chemical additives are used to improve the dispersion effect of the metal powder raw material in the metal powder slurry. The chemical parameters include the amount of chemical additives added.

[0022] In the production of conductive paste, the "pressure-gap" mechanical nonlinearity of the roller press (generally a three-roll mill; in this invention, the roller press refers to any machine that uses rollers for grinding) mainly stems from the following aspects: First, high-speed shearing raises the temperature of the roller surface, and the roller diameter increases due to thermal expansion, resulting in the actual gap being smaller than the set value, or even roller surface contact. Second, the servo adjustment mechanism has a dead zone, and the micron-level gap adjustment screw has a reverse backlash, so the tiny displacement commands issued by existing control units (such as PLCs) cannot be precisely executed by the mechanical structure. Finally, when hard agglomerates of metal powder particles enter the roller press, the instantaneous extrusion pressure rises sharply, triggering overload protection or damaging the chromium plating layer on the roller surface.

[0023] The core idea of ​​this embodiment is to add a dynamic pretreatment unit before the roller press inlet. This unit dynamically adjusts the mixing and dispersion pretreatment intensity of the metal powder slurry based on the grinding parameters such as the pressure characteristic value and gap state fed back by the roller press in real time, as well as the addition of chemical additives. This changes the role of the three-roll mill from "passive grinding that withstands impact" to "active shaping with fine adjustment". The mechanical nonlinearity problem is compensated and resolved by the pre-stage mixing and dispersion pretreatment unit through parameter adaptation.

[0024] Specifically, the physical pretreatment includes primary homogenization, temperature-controlled stirring, and ultrasonic dispersion. Primary homogenization can be achieved by adding an online high-speed homogenizer before mixing the metal powder. This homogenizer pre-shears the metal powder and carrier mixture, breaking up large hard agglomerates. It is feedback-regulated and can be re-homogenized in subsequent processes. The primary role of primary homogenization in this step is to optimize the agglomerates. Temperature-controlled stirring is performed in a temperature-controlled stirring buffer tank to regulate the slurry temperature and viscosity, providing buffer volume to match the roller press feed rate. Ultrasonic dispersion can be handled by an online ultrasonic dispersion device, which cavitation breaks up residual submicron soft agglomerates, reducing the non-uniformity of the material entering the roller press. The physical pretreatment in this embodiment can also include other existing adjustable steps, such as adjustable precision filtration, to intercept large particles or magnetic impurities that may damage the roller surface.

[0025] Furthermore, based on the above physical pretreatment, step S103 in this embodiment, which involves monitoring the grinding parameters during grinding and dynamically adjusting the mixing and dispersion pretreatment parameters according to the grinding parameters, specifically includes: By monitoring the grinding parameters during grinding, the pressure variation coefficient and subsequent particle size deviation during grinding can be obtained. The quality indicators of the slurry entering the roller press are obtained based on the pressure variation coefficient and the particle size deviation of the subsequent stage. Based on the quality index of the slurry at the roller press inlet, and using multi-level index thresholds, the physical parameters are dynamically adjusted.

[0026] In the above process, the pressure variation coefficient can be obtained from the pressure curve of the roller press. It can be statistically analyzed using any existing method or index to measure pressure changes. The particle size of the downstream discharge is the same as the particle size of the roller press output, such as D90, D10, etc. The quality index of the slurry entering the roller press can be calculated using any method, such as weighted summation, based on the above two parameters, and is used to represent the quality index of the incoming material state.

[0027] Furthermore, in one embodiment, the above step of: dynamically adjusting the physical parameters based on the quality index of the slurry at the roller press inlet and multi-level index thresholds specifically includes: Comparing the quality indicators of the slurry at the roller press inlet with the multi-level indicator thresholds, the multi-level indicator thresholds include the first-level indicator threshold, the second-level indicator threshold, and the third-level indicator threshold, which increase sequentially. If the quality index of the slurry at the roller press inlet is less than the threshold of the first-level index, then increase the homogenization speed used for primary homogenization in the physical parameters, and at the same time adjust the stirring temperature used for temperature control in the physical parameters. If the primary homogenization rotation speed reaches the upper limit, then increase the ultrasonic treatment time used for ultrasonic dispersion in the physical parameters. If the quality index of the slurry at the roller press inlet is not less than the first-level index threshold and less than the second-level index threshold, then the physical parameters shall be maintained. If the quality index of the slurry at the roller press inlet is not less than the secondary index threshold, then reduce the homogenization speed.

[0028] This embodiment introduces a multi-level threshold control mechanism based on grinding feedback. When the performance indicators are poor (below the first-level threshold), the system prioritizes physical methods that offer rapid response and consume no additional materials, such as increasing the homogenization speed and adjusting the stirring temperature to quickly enhance dispersion intensity. Only when physical methods reach their limits is the ultrasonic treatment time intelligently extended. This ensures deagglomeration while effectively avoiding excessive shearing that could damage the microstructure of the metal powder. When the performance indicators are within the ideal range, parameters remain stable, requiring only minor PID adjustments to ensure process continuity and batch consistency. When the performance indicators are excellent (above the second-level threshold), the system proactively reduces the homogenization speed to enter energy-saving mode, effectively reducing production energy consumption and equipment wear.

[0029] In the above embodiments, the dynamic pretreatment unit mainly relies on physical methods such as high-speed homogenization and ultrasonic dispersion to deagglomerate and pre-disperse the metal powder. However, physical shearing still has inherent limitations: when the agglomerate size is reduced to the submicron level, the energy required to further increase the shear strength increases exponentially, and it is easy to cause damage to the morphology of metal powder particles. For example, after excessive shearing, the specific surface area of ​​flake silver powder decreases and its conductivity is impaired; slurries dispersed only by physical methods are prone to secondary agglomeration in static or low-shear areas (such as pipe bends and roller press feed troughs), resulting in unstable inlet material conditions; the surface functional groups and zeta potential of different batches of metal powders are different, and pure physical parameter adjustments are difficult to fully compensate for this fluctuation in chemical properties.

[0030] Therefore, this invention also adds an online chemical additive control module before the roller press, which works in conjunction with the physical pretreatment unit. The selection and dosage of chemical additives are adjusted in a closed loop based on the grinding parameters fed back by the roller press in real time, achieving dual-dimensional coordinated control of physical and chemical processes. A schematic diagram of the production line in this embodiment is shown below. Figure 2 As shown.

[0031] Specifically, chemical additives include at least one of dispersants, coupling agents, rheology modifiers, and pH adjusters. Among them: Dispersants include at least one of polymeric dispersants (such as PVP and BYK series) and anionic dispersants (such as polycarboxylate salts), which are used to adsorb onto the surface of metal powders, providing electrostatic repulsion or steric hindrance, reducing van der Waals forces between particles, thereby reducing the shear force required for grinding and reducing pressure fluctuations in the roller press. When the pressure variation coefficient increases, the dispersant replenishment rate can be increased.

[0032] Coupling agents include at least one of silane coupling agents (such as KH-550 and KH-570) and titanate coupling agents. These are used to form an organic bridging layer on the surface of metal powder, improving wettability and compatibility with the organic carrier, thereby stabilizing slurry viscosity and preventing viscosity rebound after shear thinning. The coupling agent can be replenished when a "pseudoplastic recovery" phenomenon occurs in the viscosity of the roller press output.

[0033] The rheology modifier includes at least one of organobentonite, hydrogenated castor oil, and polyamide wax; it is used to form a three-dimensional thixotropic network in the slurry, imparting appropriate yield stress to the slurry, thereby preventing metal powder sedimentation and maintaining the uniformity of the slurry in the three-roll mill feed trough. The concentration of the rheology modifier can be adjusted when the roller press feed level sensor detects a concentration gradient between the upper and lower layers.

[0034] The pH adjuster includes at least one of an organic amine (AMP-95) and acetic acid, used to adjust the pH value of the system to a region far from the isoelectric point of the metal powder, enhancing the absolute value of the zeta potential and thus improving the long-term effectiveness of the electrostatic stabilization mechanism. It can automatically verify and adjust the pH setpoint when the particle size D90 of the roller press discharges drifts for three consecutive batches.

[0035] It should be noted that the regulation of chemical additives is not isolated, but rather constitutes a two-dimensional optimization problem together with physical pretreatment parameters. The goal is to find the optimal balance between physical shear energy consumption and chemical additive dosage, while meeting the quality requirements of the slurry entering the roller press. In practice, physical parameters can be adjusted first due to their rapid response and lack of introduction of additional substances. When adjusting physical parameters to their limits still fails to meet the requirements, chemical additive regulation is initiated. The dosage of chemical additives is constrained by the upper limit of the final product formulation to avoid side effects on downstream sintering or printing processes.

[0036] In one embodiment, the chemical additives include dispersants and coupling agents. Correspondingly, step S103 above, monitoring the grinding parameters during grinding and dynamically adjusting the mixing and dispersion pretreatment parameters according to the grinding parameters, specifically includes: By monitoring the grinding parameters during grinding, the pressure variation coefficient during grinding is obtained; Adjust the amount of dispersant added according to the pressure variation coefficient and add it accordingly; After adding the dispersant, the grinding parameters for multiple grinding cycles were obtained; If the grinding parameters for multiple grinding cycles do not meet the preset response standard, adjust the amount of coupling agent added and add it.

[0037] This embodiment optimizes the response matching between chemical additives and grinding conditions, establishing a step-by-step verification-based control logic for dispersants and coupling agents. First, based on the real-time pressure variation coefficient, the amount of dispersant with the fastest response and widest application range is preferentially adjusted to rapidly reduce grinding resistance and pressure fluctuations by enhancing electrostatic repulsion or steric hindrance. Parameter changes in subsequent grinding cycles are continuously monitored to verify the true effectiveness of the dispersant. If the response is found to be substandard, a second-level response mechanism is triggered, intelligently adjusting the amount of coupling agent to alter the interfacial compatibility between the metal powder and the organic carrier. This not only minimizes unnecessary consumption of expensive coupling agents but also precisely solves the dispersion failure problem caused by raw material batch fluctuations, ensuring that the pre-treated slurry possesses highly consistent low-friction, low-agglomeration rheological properties before entering the roller press.

[0038] In one embodiment, adjusting the amount of coupling agent added and then adding it specifically includes: By monitoring the grinding parameters during grinding, the particle size distribution of the subsequent stages during grinding can be obtained; Adjust the amount of coupling agent added according to the particle size distribution of the downstream particles and add it accordingly.

[0039] This embodiment dynamically calculates the optimal addition amount based on the specific characteristics of the subsequent particle size distribution (such as the distribution width reflected by the D90 / D10 ratio), thereby minimizing the potential negative impact of chemical additives on the final conductivity.

[0040] In one embodiment, the chemical additive includes a rheology modifier. Correspondingly, step S103 above, monitoring the grinding parameters during grinding and dynamically adjusting the mixing and dispersion pretreatment parameters according to the grinding parameters, includes: By monitoring the grinding parameters during grinding, the density difference and feeding rate of different feed troughs of the roller press can be obtained; If the density difference between different feed troughs of the roller press exceeds the preset density difference threshold, the amount of rheology modifier to be added is determined according to the feed rate and then added.

[0041] Traditional control methods often only respond passively after grinding anomalies occur. This embodiment, however, by monitoring the density differences at different locations (upper, middle, and lower) of the roller press feed trough in real time, can keenly detect early signs of initial sedimentation of metal powder before it enters the grinding zone. Once the density difference exceeds a preset threshold, the system does not simply apply a constant dose of rheology modifier, but intelligently performs dynamic correlation calculations between the added amount and the real-time feed rate (e.g., the replenishment flow rate is proportional to the feed volume flow rate). This method effectively prevents uneven feeding and localized overload or idling of the roller press caused by sedimentation, while strictly avoiding side effects such as excessively high slurry viscosity and poor ink penetration in downstream printing caused by excessive accumulation of rheology modifier.

[0042] In one embodiment, the chemical additive includes a pH adjuster. Correspondingly, step S103 above, monitoring the grinding parameters during grinding and dynamically adjusting the mixing and dispersion pretreatment parameters based on the grinding parameters, includes: By monitoring the grinding parameters during grinding, the particle size of the subsequent grinding stage can be obtained; Based on the subsequent particle size, the particle size increment index is obtained; If the particle size increment index exceeds the preset increment threshold, adjust the amount of pH adjuster accordingly and add it.

[0043] The particle size increase index can be any indicator that describes the increase in particle size, such as the particle size increase rate. This embodiment uses the "particle size increase index" variable to detect hidden anomalies where, although the particle size D90 and other indicators of multiple consecutive batches of output are still within acceptable limits, they show a monotonically increasing trend. When this index exceeds a preset threshold, it can be considered that there is a mismatch between the surface zeta potential or functional group state of the current metal powder and the existing dispersion system. At this point, a micro-addition of pH adjuster is intelligently triggered. By adjusting the pH of the slurry system to a range far from the optimal isoelectric point, the efficient adsorption and stabilization performance of the dispersant is restored from the microscopic charge repulsion level, improving product consistency and process robustness in long-term continuous production.

[0044] Combination Figure 3 The present invention also provides a collaborative automated control system for the production of conductive slurry mixing and dispersion, comprising: The dynamic pretreatment unit 310 is used to perform mixed dispersion pretreatment on metal powder raw materials based on mixed dispersion pretreatment parameters to obtain metal powder slurry; The grinding unit 320 is used to feed metal powder slurry into a roller press for grinding to obtain grinding slurry; The dynamic adjustment unit 330 is used to monitor the grinding parameters during grinding and dynamically adjust the mixing and dispersion pretreatment parameters according to the grinding parameters; Production unit 340 is used to process the grinding slurry to obtain a conductive slurry; The mixed dispersion pretreatment includes physical pretreatment and chemical pretreatment. The parameters of the mixed dispersion pretreatment include physical parameters and chemical parameters. The physical pretreatment includes dispersing the metal powder raw material. The physical parameters are used to control the physical pretreatment. The chemical pretreatment includes adding chemical additives. The chemical additives are used to improve the dispersion effect of the metal powder raw material in the metal powder slurry. The chemical parameters include the amount of chemical additives added.

[0045] It should be noted that the above systems mainly refer to computer program products.

[0046] This invention provides a collaborative automated control method for the mixing and dispersion production of conductive slurry. First, based on mixing and dispersion pretreatment parameters, metal powder raw materials are subjected to mixing and dispersion pretreatment to obtain a metal powder slurry. Then, the metal powder slurry is fed into a roller press for grinding to obtain a ground slurry. Next, the grinding parameters during grinding are monitored, and the mixing and dispersion pretreatment parameters are dynamically adjusted based on these parameters. Finally, the ground slurry is processed to obtain a conductive slurry. The mixing and dispersion pretreatment includes physical pretreatment and chemical pretreatment. The mixing and dispersion pretreatment parameters include physical parameters and chemical parameters. Physical pretreatment includes dispersing the metal powder raw materials, and the physical parameters are used to control the physical pretreatment. Chemical pretreatment includes adding chemical additives to improve the dispersion effect of the metal powder raw materials in the metal powder slurry. The chemical parameters include the amount of chemical additives added. This invention introduces a dynamic mixing and dispersion pretreatment step upstream of the roller pressing and grinding process, incorporating the synergistic effect of physical dispersion and chemical additives, and constructs a closed-loop control mechanism based on grinding parameter feedback, achieving proactive compensation and suppression of nonlinear disturbance factors at their source. Specifically, this invention avoids forcibly driving a servo mechanism already at its physical limits. Instead, it optimizes the agglomeration of metal powder, thereby reducing the hard impact load on the roller surface during grinding. Simultaneously, by precisely controlling the amount of chemical additives, it improves the wettability and suspension stability of the metal powder in the carrier, reducing the internal friction coefficient of the slurry and the heat generated during grinding. This synergistic control strategy allows the roller press to operate stably within a relatively larger safety clearance range, significantly reducing the phenomenon of large metal powder particles being directly crushed by the roller surface due to forced gap pressing. This eliminates the risk of chromium plating layer wire drawing damage and subsequent batch metal debris contamination from the source. It also solves the mechanical nonlinearity problem of roller presses in the existing conductive slurry mixing and dispersion production process.

[0047] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method for coordinated automated control of conductive paste mixing and dispersion production, characterized in that, Includes the following steps: Based on the mixing and dispersion pretreatment parameters, the metal powder raw material is subjected to mixing and dispersion pretreatment to obtain a metal powder slurry; Metal powder slurry is fed into a roller press for grinding to obtain grinding slurry; Monitor the grinding parameters during grinding and dynamically adjust the mixing and dispersion pretreatment parameters based on the grinding parameters; The grinding slurry is processed to obtain a conductive slurry; The mixed dispersion pretreatment includes physical pretreatment and chemical pretreatment. The mixed dispersion pretreatment parameters include physical parameters and chemical parameters. The physical pretreatment includes dispersing the metal powder raw material. The physical parameters are used to control the physical pretreatment. The chemical pretreatment includes adding chemical additives. The chemical additives are used to improve the dispersion effect of the metal powder raw material in the metal powder slurry. The chemical parameters include the amount of chemical additives added. Physical pretreatment includes primary homogenization, temperature-controlled stirring, and ultrasonic dispersion; Monitor grinding parameters during grinding and dynamically adjust mixing and dispersion pretreatment parameters based on these parameters, including: The grinding parameters during grinding are monitored to obtain the pressure variation coefficient and the subsequent particle size deviation. The pressure variation coefficient is obtained from the pressure curve of the roller press and is used to measure the pressure change. The subsequent particle size is the particle size of the material discharged from the roller press. The quality indicators of the slurry entering the roller press are obtained based on the pressure variation coefficient and the particle size deviation of the subsequent stage. Based on the quality indicators of the slurry at the roller press inlet, and using multi-level indicator thresholds, the physical parameters are dynamically adjusted, specifically including: Comparing the quality indicators of the slurry at the roller press inlet with the multi-level indicator thresholds, the multi-level indicator thresholds include the first-level indicator threshold, the second-level indicator threshold, and the third-level indicator threshold, which increase sequentially. If the quality index of the slurry at the roller press inlet is less than the threshold of the first-level index, then increase the homogenization speed used for primary homogenization in the physical parameters, and at the same time adjust the stirring temperature used for temperature control in the physical parameters. If the primary homogenization rotation speed reaches the upper limit, then increase the ultrasonic treatment time used for ultrasonic dispersion in the physical parameters. If the quality index of the slurry at the roller press inlet is not less than the first-level index threshold and less than the second-level index threshold, then the physical parameters shall be maintained. If the quality index of the slurry at the roller press inlet is not less than the secondary index threshold, then reduce the homogenization speed.

2. The method for coordinated automated control of conductive paste mixing and dispersion production according to claim 1, characterized in that, Chemical additives include dispersants and coupling agents; grinding parameters are monitored during grinding, and mixing and dispersion pretreatment parameters are dynamically adjusted based on the grinding parameters, including: By monitoring the grinding parameters during grinding, the pressure variation coefficient during grinding is obtained; Adjust the amount of dispersant added according to the pressure variation coefficient and add it accordingly; After adding the dispersant, the grinding parameters for multiple grinding cycles were obtained; If the grinding parameters for multiple grinding cycles do not meet the preset response standard, adjust the amount of coupling agent added and add it.

3. The method for coordinated automated control of conductive paste mixing and dispersion production according to claim 2, characterized in that, Adjust the dosage of the coupling agent and add it accordingly, including: By monitoring the grinding parameters during grinding, the particle size distribution of the subsequent stages during grinding can be obtained; Adjust the amount of coupling agent added according to the particle size distribution of the downstream particles and add it accordingly.

4. The method for coordinated automated control of conductive paste mixing and dispersion production according to claim 1, characterized in that, Chemical additives include rheology modifiers; monitoring grinding parameters during grinding and dynamically adjusting mixing and dispersion pretreatment parameters based on these parameters, including: By monitoring the grinding parameters during grinding, the density difference and feeding rate of different feed troughs of the roller press can be obtained; If the density difference between different feed troughs of the roller press exceeds the preset density difference threshold, the amount of rheology modifier to be added is determined according to the feed rate and then added.

5. The method for coordinated automated control of conductive slurry mixing and dispersion production according to claim 1, characterized in that, Chemical additives include pH adjusters; grinding parameters are monitored during grinding, and mixing and dispersion pretreatment parameters are dynamically adjusted based on the grinding parameters, including: By monitoring the grinding parameters during grinding, the particle size of the subsequent grinding stage can be obtained; Based on the subsequent particle size, the particle size increment index is obtained; If the particle size increment index exceeds the preset increment threshold, adjust the amount of pH adjuster accordingly and add it.

6. The method for coordinated automated control of conductive paste mixing and dispersion production according to claim 1, characterized in that, The chemical additives include at least one of dispersants, coupling agents, rheology modifiers, and pH adjusters; the dispersants include at least one of polymeric dispersants and anionic dispersants; the coupling agents include at least one of silane coupling agents and titanate coupling agents; the rheology modifiers include at least one of organobentonite, hydrogenated castor oil, and polyamide wax; and the pH adjusters include at least one of organic amines and acetic acid.

7. A collaborative automated control system for the mixing and dispersion production of conductive slurry, applied to the method described in any one of claims 1-6, characterized in that, include: The dynamic pretreatment unit is used to perform mixed dispersion pretreatment on metal powder raw materials based on mixed dispersion pretreatment parameters to obtain metal powder slurry; The grinding unit is used to feed metal powder slurry into a roller press for grinding to obtain grinding slurry; The dynamic adjustment unit is used to monitor the grinding parameters during grinding and dynamically adjust the mixing and dispersion pretreatment parameters according to the grinding parameters; The production unit is used to process the grinding slurry to obtain a conductive slurry; The mixed dispersion pretreatment includes physical pretreatment and chemical pretreatment. The parameters of the mixed dispersion pretreatment include physical parameters and chemical parameters. The physical pretreatment includes dispersing the metal powder raw material. The physical parameters are used to control the physical pretreatment. The chemical pretreatment includes adding chemical additives. The chemical additives are used to improve the dispersion effect of the metal powder raw material in the metal powder slurry. The chemical parameters include the amount of chemical additives added.

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