Electronic packaging structure glue toughening modifier proportioning device and preparation method

Abstract

This invention relates to the field of modifier preparation technology, specifically to a mixing equipment and preparation method for toughening modifiers for electronic packaging structural adhesives. The equipment includes a support frame, a material cylinder comprising an inner liner, an outer protective sleeve, and a fixing frame, and a high-precision metering pump on the discharge pipe. A temperature probe is also installed on the side wall of the inner liner. An air inlet pipe connects to an external low-pressure steam heat source. A shearing structure is also provided inside the packing cylinder. A laser particle size analyzer is also embedded inside the packing cylinder. A degassing structure is provided inside the mixing cylinder, including a central shaft, defoaming plates, branch shafts, a turning plate, and an ultrasonic generator. A driving structure is also provided between the central shaft and the branch shafts. A vacuum tube is connected to the inner side of the mixing cylinder, and a vacuum pump is installed on the vacuum tube. An industrial control computer is also located on the outer side of the mixing cylinder. This invention achieves the purification and reuse of high-temperature waste heat airflow in the workshop, and also enables efficient elimination of bubbles in the mixed liquid through multiple methods, improving the precise proportioning and quality of the prepared adhesive solution for packaging structural adhesives.

Description

Technical Field

[0001] This invention relates to the fields of structural adhesive production and modifier preparation technology, specifically to a mixing equipment and preparation method for a toughening modifier for electronic packaging structural adhesives. Background Technology

[0002] Toughening modifiers for electronic encapsulation structural adhesives (mainly epoxy-based) typically consist of four parts: an elastomer matrix, a compatibilizer, functional additives, and nanofillers. However, the preparation and use of existing structural adhesive toughening modifiers have unsatisfactory results.

[0003] The prior art document "CN220633822U, A Mixing Device for the Production of Structural Adhesive with Adjustable Proportion" describes a device that includes a protective outer shell and a stirring blade fixedly connected to the stirring rod. The present application, through the setting of a proportioning plate, allows for the proportional adjustment and conveying of raw materials. A rotating component drives a first bevel gear, which in turn drives a threaded rod smoothly via a second bevel gear. The threaded rod's rotation smoothly pushes a lifting plate, reducing the space within the proportioning plate. A scale is provided in the material trough within the proportioning plate, allowing observation of the required proportion through a transparent plate. After adjustment, a first servo motor is activated to drive the proportioning plate. As the proportioning plate rotates, the raw materials in the hopper fall into the material trough, and the rotation of the proportioning plate ensures smooth material conveying and use.

[0004] However, the aforementioned existing structural adhesive mixing devices only address the issue of raw material proportioning and delivery, failing to simultaneously address the problems of raw material preservation, addition and use, temperature control, and dispersion management while ensuring precise proportioning of various raw materials. Further analysis reveals issues such as the use of fillers in structural adhesives. Existing fillers exhibit poor process stability, including nanofiller agglomeration and large batch-to-batch viscosity / strength fluctuations (CV≥8%). Further analysis also reveals the lack of viscosity control for the main components, coupling agents, and functional additives used in structural adhesives before proportioning and use. Such practices pose significant safety risks in the preparation of encapsulated structural adhesives, and in severe cases, can affect the quality consistency of batch-to-batch encapsulated structural adhesives.

[0005] Further investigation of the publicly available technology "CN103904288 B, A Rapid Proportioning and Mixing Addition Equipment" reveals that "the equipment includes: a proportioning and mixing device for achieving quantitative proportioning and rapid mixing of the gel solution and the acid solution; an automatic metering device, controllably connected to the proportioning and mixing device, for quantitatively controlling the mixture entering the automatic metering device from the proportioning and mixing device, thereby for quantitative injection into batteries of corresponding specifications; and an addition device, connected to the metering device, through which the quantitatively mixed solution controlled by the automatic metering device is injected into the battery, thereby completing the addition of electrolyte to the gel battery. The method for adding electrolyte to gel batteries using the above equipment is also disclosed. The structure is reasonably designed, enabling integrated proportioning, mixing, addition, and cleaning, and is fast, simple, and automates acid quantity adjustment, reducing the time for addition and mixing, and improving production efficiency."

[0006] However, while the existing adhesive mixing equipment mentioned above solves the problem of adhesive ratio to some extent, it still fails to meet the accuracy requirements and intelligent control standards for the ratio of structural adhesive toughening modifiers. Furthermore, the traditional methods of filling material drying and structural adhesive mixing often rely on electric heating, resulting in significant energy consumption and waste. In other words, it still fails to achieve energy conservation and environmental protection while ensuring production cost-effectiveness. In the early stages of structural adhesive production, the high-temperature melting process for purchasing raw materials to produce the main agent generates a large amount of waste heat, which is directly discharged without utilization, also wasting resources. Simultaneously, whether in the ratio and use of the structural adhesive raw material liquid or in the stage of mixing all raw materials, the traditional methods for eliminating air bubbles in structural adhesives are too simplistic and ineffective, and the presence of air bubbles seriously affects the quality of the encapsulated structural adhesive. In other words, existing structural adhesive production technology has not yet achieved the goal of effectively eliminating air bubbles in the encapsulated structural adhesive raw materials and mixtures through multiple methods, reducing the air bubble production rate, and thus improving the quality of the encapsulated structural adhesive mixing and preparation, in addition to purifying the high-temperature waste heat airflow in the workshop and utilizing low-pressure steam waste heat. Summary of the Invention

[0007] To address the shortcomings and deficiencies of existing toughening modifier formulations, this invention provides a formulation device for toughening modifiers of electronic packaging structural adhesives.

[0008] The present invention achieves the above objectives by adopting the following technical solution: A mixing device for a toughening modifier of an electronic packaging structural adhesive includes a vertically distributed support frame. A mixing cylinder is located at the bottom of the support frame, and three material cylinders and a filler cylinder are evenly distributed in a ring on the support frame and above the mixing cylinder. Each material cylinder includes an inner liner, an outer protective sleeve, and a fixing frame positioned between them. The inner liner has an inlet pipe connected to its top and an outlet pipe connected to the mixing cylinder at its bottom. A high-precision metering pump is installed on the outlet pipe. A temperature probe is also installed on the side wall of the inner liner. An air inlet pipe is located at the bottom of the material cylinder, between the inner liner and the outer protective sleeve, and an air outlet pipe is located at its top. The air inlet pipe is connected to an external low-pressure steam heat source. The filler cylinder and the mixing cylinder have the same structure as the material cylinders, and the filler cylinder also has a shearing structure to perform high-speed dispersion to pre-treat the micron-sized filler, followed by low-speed shearing. The system completes the dispersion treatment of nanofillers and can perform vibration grinding on the fillers; a laser particle size analyzer is also embedded in the filler cylinder; filler dispersion monitoring: the fineness (≤5μm) is detected in real time by the laser particle size analyzer to prevent agglomeration; the mixing cylinder is equipped with a degassing structure, which includes a central shaft, defoaming plates, branch shafts, a turning plate, and an ultrasonic generator; the central shaft is vertically distributed in the mixing cylinder, the defoaming plates are set on the central shaft and can rotate and move up and down along the central shaft; there are multiple branch shafts centered on the central shaft, and the turning plates are set on the branch shafts, and the two are threadedly connected; the ultrasonic generator is set in the inner cavity of the central shaft and the branch shafts; a drive structure is also provided between the central shaft and the branch shafts; a vacuum tube is also connected to the inner side of the mixing cylinder, and a vacuum pump is installed on the vacuum tube; an industrial control computer is also provided on the outer side of the mixing cylinder.

[0009] To achieve integrated installation of the mixing equipment, optimize structural design, maximize space utilization, and avoid the problem of large space occupation in traditional single-unit designs, this invention adopts a preferred technical solution: the support frame includes support legs, a first mounting ring, a connecting arm, a second mounting ring, and a third mounting ring; the support legs are vertically distributed and fixed to the first mounting ring by welding, the first mounting ring being used to connect the mixing cylinder; the connecting arm is inclined and its bottom end is fixed to the first mounting ring, and its top end is connected to the second mounting ring; the diameter of the second mounting ring is larger than the diameter of the first mounting ring; multiple third mounting rings are evenly distributed and installed on the second mounting ring, the third mounting rings being used to connect the material cylinder and the packing cylinder.

[0010] To further streamline the process of feeding, storing, and precisely proportioning individual materials, while also ensuring convenient maintenance of individual materials and improving the ease of inspection and replacement of material cylinders, thus avoiding the problems of traditional material cylinders being too tall and fixed, making disassembly and maintenance difficult; this invention further adopts a preferred technical solution: the third mounting ring consists of multiple evenly distributed rings, which are connected and fixed to the second mounting ring via a side shaft; wherein, the third mounting ring also includes two symmetrically distributed fastening plates, one side of which is hinged to the side shaft and the other side has a mounting hole, and the mounting holes of the two fastening plates are connected and fixed by fastening bolts.

[0011] To further realize the independent use capability of individual cylinder control, further ensure the rational distribution of heat source and automation effect, and at the same time take into account the problem of excess glue residue and solidification in the discharge pipe, which would affect the accuracy of subsequent material proportioning and weight, the present invention further adopts a preferred technical solution: electromagnetic switch valves are provided on both the air inlet pipe and the air outlet pipe, and a safety valve is also provided on the air outlet pipe; wherein, a return pipe is provided on one side of the discharge pipe of the material cylinder and above the high-precision metering pump, the output end of the return pipe leads to the inner liner, and a gear pump is also provided on the return pipe, and a one-way valve is also provided at the input end of the return pipe.

[0012] To achieve efficient use of raw materials such as main agents, additives, and coupling agents, thereby ensuring the fluidity and viscosity requirements of the adhesive raw materials, and further addressing the elimination of air bubbles in the adhesive raw materials, thus providing favorable conditions for the subsequent high-quality preparation of modifiers, this invention further adopts a preferred technical solution: the material cylinder is also equipped with a stirring structure, which includes a stirring motor, a stirring shaft, and stirring blades; the stirring motor is mounted on the material cylinder via a bracket, the stirring shaft is vertically distributed in the material cylinder and connected to the stirring motor; the stirring blades are disposed on the stirring shaft, and a filament is provided between the two vertically distributed stirring blades.

[0013] To further improve the intelligent processing effect of filler drying and dispersion, thereby increasing the dispersibility of the filler by 50%, reducing the agglomeration rate to <5%, and achieving batch stability CV <5%, the present invention employs a preferred technical solution: the shearing structure includes a variable speed motor, a rotating shaft, crushing blades, and a vibrating grinding component; the variable speed motor is mounted on the filler cylinder via a bracket, and the rotating shaft is vertically distributed inside the filler cylinder and connected to the variable speed motor; there are multiple crushing blades, all mounted on the rotating shaft; the vibrating grinding component includes a fixed sleeve, steel wire ropes, and vibrating grinding balls; the fixed sleeve is fixedly installed on the lower part of the rotating shaft; one end of the steel wire rope is connected to the fixed sleeve, and the other end is connected to the vibrating grinding ball; the steel wire ropes and vibrating grinding balls are matched and arranged in multiple sets in a ring; the length of the multiple steel wire ropes gradually decreases in a clockwise direction, and the vibrating grinding balls are also provided with particle protrusions.

[0014] To further improve the uniform mixing of multiple raw material components in the mixing drum and optimize the treatment of bubbles generated in the mixture, millimeter-level tangents are used to enhance and eliminate bubbles, further improving the preparation quality of the toughening modifier and enhancing product consistency. The present invention further adopts a preferred technical solution: the defoaming plate includes a rectangular frame and tangents arranged within the rectangular frame, wherein the tangents are staggered and have a diameter on the millimeter level; a connecting plate is provided on one side of the defoaming plate, and one end of the connecting plate is threadedly connected to the central shaft via a rotating sleeve; the movement of the defoaming plate and the turning plate do not interfere with each other.

[0015] To achieve a reasonable configuration within a limited space, a single-drive motor design is adopted, which drives the central defoaming plate to rotate spirally and move up and down. The structure is simple and the manufacturing cost is low. At the same time, it can also take into account the up and down movement of the mixture at multiple points on the periphery, which can further improve the uniformity of mixing and the efficiency of defoaming treatment. The present invention further adopts a preferred technical solution: the drive structure includes a drive motor, a main wheel, and a secondary wheel; the drive motor is set in the mixing cylinder and connected to the central shaft; the main wheel is sleeved and installed on the central shaft, and the secondary wheel is set on the branch shaft, and the main wheel and the secondary wheel are kept in meshing transmission.

[0016] To further achieve the rational and safe use of waste heat sources and avoid affecting the quality of the adhesive, it is necessary to carry out environmentally friendly purification treatment such as impurity removal and desulfurization adsorption. This will further improve the energy-saving and environmental protection effect of the mixing equipment, reduce the consumption of electricity resources, and effectively reduce the production cost of the enterprise's modifier preparation. The present invention further adopts a preferred technical solution: the input end of the multiple air inlet pipes is also provided with a transfer box. The transfer box contains, from left to right, millimeter-level filter screen, non-woven fabric, 10mm pore size activated carbon block, air filter cotton, 10-micron pore size activated carbon particles, and micron-level filter screen. The transfer box has a door on one side and thermal insulation cotton on the outer wall.

[0017] A method for preparing a mixing device for toughening modifiers of electronic packaging structural adhesives, wherein the above-mentioned mixing device is used to prepare the toughening modifiers of structural adhesives, and the preparation method is as follows: Step S1: First, turn on the stirring motor to achieve the preset flowability and viscosity requirements of the elastomer main agent, coupling agent, and functional additives in the material cylinder; and turn on the electromagnetic switch valve of the air inlet pipe to heat up the material cylinder, packing cylinder, and mixing cylinder through low-pressure steam heat, and intelligently control and adjust the temperature of the corresponding cylinders in conjunction with temperature probes and industrial control computers. Step S2: The next step is to initially add the filler into the filler cylinder, ensuring the filler drying temperature is 100–120℃; simultaneously turn on the variable speed motor, first add the micron filler for high-speed dispersion, then add the nano filler for low-speed shearing to avoid nano-agglomeration and achieve batch stability CV<5%; the high-speed dispersion is 300–500 rpm / 30min; the low-speed shearing is 80–100 rpm / 30min; the synchronous forward and reverse rotation of the variable speed motor will drive the vibrating mill ball to switch between different directions and high-speed and low-speed rotation modes to complete the vibrating milling of the filler, and the fineness is detected in real time by a laser particle size analyzer, with a fineness requirement of ≤5μm; Step S3: The operator inputs the material proportioning parameters via an industrial control computer, specifying the following weight ratios: elastomer main agent: 60–80; coupling agent: 2–5; functional additives: 8–30; nanofiller: 0–5. Then, under the feedback control of a high-precision metering pump, the elastomer main agent, functional additives, coupling agent, and nanofiller are sequentially added to the mixing cylinder. The drive motor is started and maintained at 20–50 rpm / min, and the temperature is controlled at 60–80℃. Ultrasonic degassing at 40 kHz for 30 min and vacuum degassing at -0.09 MPa for 30 min are also initiated, resulting in a bubble rate of <0.1%. Finally, a high-precision proportioned, high-quality toughening modifier for encapsulating structural adhesives is obtained.

[0018] Based on the above-mentioned targeted analysis of the beneficial effects of the technical features of the technical solution, this proportioning equipment utilizes the waste heat from the melting process in the same workshop, and after purification treatment, simultaneously optimizes the structural design of the material cylinder. It can be directly used for the preheating of raw materials, drying of fillers, and temperature control needs in the mixing stage. In the filler processing step, the material is added in stages: first, micron-sized fillers are added for high-speed dispersion, and then nano-sized fillers are added for low-speed shearing; the fineness is ≤2μm to avoid nano-agglomeration, and the batch stability CV of temperature, rotation speed, and time is standardized to <5%. This mixing equipment employs a high-precision metering pump (error ≤ ±0.5%) for precise mixing control, avoiding errors from manual mixing. It precisely controls the temperature gradient of the mixed solution, maintaining a temperature of 60℃ during the mixing stage to ensure full compatibility of the coupling agent and filler. During the degassing stage, the temperature is maintained at 40℃ to reduce viscosity and thoroughly degas. A triple approach of tangential circular motion, ultrasonic degassing, and vacuum degassing is used to eliminate bubbles, ensuring a bubble rate of <0.1%. This further guarantees the high quality of the modifier preparation. This mixing equipment not only purifies the high-temperature waste heat airflow in the workshop and utilizes low-pressure steam waste heat, but also efficiently eliminates bubbles in the encapsulation structural adhesive raw materials and mixture through multiple methods, reducing the bubble production rate and significantly improving the quality and consistency of the encapsulation structural adhesive mixing preparation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions 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 perspective view of the overall structure of the present invention; Figure 2 This is a front view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the material cylinder of the present invention; Figure 4 This is a schematic diagram of the structural distribution of the transfer box of the present invention; Figure 5 This is a cross-sectional view of the packing cylinder of the present invention; Figure 6 This is a partial structural diagram of the shear structure of the present invention; Figure 7 This is a cross-sectional view of the mixing cylinder of the present invention; Figure 8 for Figure 7 Enlarged view of part A in the diagram; Figure 9This is a three-dimensional view of the degassing structure of the present invention.

[0021] In the diagram: 1. Support frame; 11. Support leg; 12. First mounting ring; 13. Connecting arm; 14. Second mounting ring; 15. Third mounting ring; 16. Side shaft; 17. Fastening plate; 18. Mounting hole; 19. Fastening bolt; 2. Mixing cylinder; 21. Vacuum tube; 22. Vacuum pump; 3. Material cylinder; 31. Inner liner; 32. Outer protective sleeve; 33. Fixing frame; 34. Air inlet pipe; 35. Air outlet pipe; 36. Electromagnetic switch valve; 37. Safety valve; 38. Return pipe; 39. Gear pump; 310. Check valve; 311. Thermal insulation cotton; 312. Stirring structure; 313. Stirring motor; 314. Stirring shaft; 315. Stirring blade; 316. Thread; 317. Transfer box; 318. Millimeter-level filter screen; 319. Non-woven fabric; 320. Activated carbon block; 321. Air filter cotton; 322. Activated carbon granules; 323. Micron-level filter screen; 324. Box door; 325. Feed pipe; 326. Discharge pipe; 4. Packing cylinder; 41. Laser particle size analyzer; 5. High-precision metering pump; 6. Temperature probe; 7. Shearing structure; 71. Variable speed motor; 72. Rotating shaft; 73. Crushing blade; 74. Vibrating grinding component; 741. Fixing sleeve; 742. Steel wire rope; 743. Vibrating grinding ball; 744. Particle protrusion; 8. Defoaming structure; 81. Central shaft; 82. Defoaming plate; 821. Rectangular frame; 822. Tangent; 823. Connecting plate; 824. Rotating sleeve; 83. Branch shaft; 84. Tilting plate; 85. Ultrasonic generator; 9. Drive structure; 91. Drive motor; 92. Main wheel; 93. Sub-wheel; 10. Industrial control computer. Detailed Implementation

[0022] 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.

[0023] Example: Figures 1 to 9 As shown: A mixing device for toughening modifiers of structural adhesives for electronic packaging is disclosed. The device includes a vertically distributed support frame 1, a mixing cylinder 2 at the lower part of the support frame 1, and three annularly distributed material cylinders 3 and a filler cylinder 4 on the support frame 1 and above the mixing cylinder 2. The three material cylinders correspond to three different raw material types. Alternatively, this embodiment can employ a structure with multiple material cylinders, tailored to the design requirements of the construction site. To achieve integrated installation of the mixing device, optimize structural design, maximize space utilization, and avoid the problem of large space occupation in traditional single-unit designs, this invention adopts a preferred technical solution: the support frame 1 includes support legs 11, a first mounting ring 12, a connecting arm 13, a second mounting ring 14, and a third mounting arm 15. Specifically, the support legs 11 are vertically distributed and fixed to the first mounting ring 12 by welding; multiple support legs are evenly distributed. The first mounting ring 12 connects to the mixing cylinder 2; specifically, the two are fixed by welding to ensure good stability. The connecting arms 13 are inclined and their bottom ends are fixedly connected to the first mounting ring 12, while their top ends are connected to the second mounting ring 14. The diameter of the second mounting ring 14 is larger than the diameter of the first mounting ring 12. This arrangement facilitates equipment maintenance and meets process requirements. Multiple sets of third mounting rings 15 are evenly distributed and mounted on the second mounting rings 14. The third mounting rings 15 are used to connect the material cylinder 3 and the packing cylinder 4. The third mounting rings are fixedly mounted on the second mounting rings to ensure stable support of the foundation.

[0024] like Figure 1 and Figure 2 As shown: In this embodiment, specifically, in order to further realize the process flow of feeding, storing, and accurately proportioning individual materials, while also taking into account the convenience of using and maintaining individual materials, and improving the convenience of inspection and replacement of material cylinder 3, avoiding the problem of traditional material cylinder 3 being too tall and fixed, making disassembly and maintenance difficult; the present invention further adopts a preferred technical solution: each group of the third mounting rings 15 consists of multiple evenly distributed vertically, and is connected and fixed to the second mounting rings 14 through the side shaft 16; in this embodiment, the side shaft is perpendicular to the second mounting ring and welded to it. Each material cylinder is equipped with two vertically distributed third mounting rings. Among them, the third mounting ring 15 also includes two symmetrically distributed fastening plates 17. The fastening plates are generally semi-circular in structure, and one side of the fastening plate 17 is hinged to the side shaft 16, and the other side has a mounting hole 18. The mounting holes 18 of the two fastening plates 17 are connected and fixed by fastening bolts 19. The purpose of this setting is to adopt a detachable structure, ensuring the stability of the material cylinder foundation while improving the convenience of disassembly and maintenance of individual material cylinders, making it more practical.

[0025] like Figure 1 and Figure 3As shown: The material cylinder 3 includes an inner liner 31, an outer protective sleeve 32, and a fixing frame 33 positioned between them. The fixing frame is existing technology and can be ring-shaped, with its inner wall fixed to the inner liner and its outer wall fixed to the outer protective sleeve. It also has multiple through holes, primarily for supporting the inner liner and facilitating ventilation and preheating. The top of the inner liner 31 is connected to an inlet pipe 325, and the bottom is connected to the mixing cylinder 2 via an outlet pipe 326. A high-precision metering pump 5 and an electromagnetic switch valve are also installed on the outlet pipe 326. This configuration allows for high-precision metering and proportioning of materials in conjunction with an industrial control computer. Furthermore, a temperature probe 6 is installed on the side wall of the inner liner 31; this configuration aims to perform real-time temperature measurement of the inner liner, thereby ensuring optimal conditions for material addition and use. An air inlet pipe 34 is located at the bottom of the area between the inner liner 31 and the outer protective sleeve 32 inside the material cylinder 3, and an air outlet pipe 35 is located at the top. The air inlet pipe 34 is connected to an external low-pressure steam heat source. This low-pressure steam heat source comes from the waste heat of the rubber raw material heating and melting process in the same workshop. This arrangement maximizes the heat source required by the mixing equipment based on the reasonable layout of the heat pipes. The main purpose of the heat required by the mixing equipment is to achieve optimal control of the raw materials and the mixing process, so the heat source requirement is relatively small. Using independent electric heating would result in unnecessary waste of electrical energy. The structures of the packing cylinder 4 and the mixing cylinder 2 are the same as those of the material cylinder 3, both including an inner liner, a fixing frame, and a heating structure.

[0026] like Figure 3 As shown: To achieve efficient use of raw materials such as main agents, additives, and coupling agents, thereby ensuring the fluidity and viscosity requirements of the adhesive raw materials, and further addressing the elimination of air bubbles in the adhesive raw materials, thus providing favorable conditions for the subsequent high-quality preparation of modifiers, this invention further adopts a preferred technical solution: the material cylinder 3 is also equipped with a stirring structure 312, wherein the stirring structure 312 includes a stirring motor 313, a stirring shaft 314, and stirring blades 315. The stirring motor 313 is mounted on the material cylinder 3 via a bracket; specifically, the stirring motor is a servo-controlled motor and is mounted on an outer protective sleeve. The stirring shaft 314 is vertically arranged in the material cylinder 3 and connected to the stirring motor 313; specifically, the stirring shaft is located in the inner liner. The stirring blades 315 are arranged on the stirring shaft 314, and a wire 316 is provided between the two vertically distributed stirring blades 315. With this setup, taking the material cylinder containing the elastomer main agent as an example, when the stirring motor starts, it will drive the stirring shaft and stirring blades to rotate synchronously. During the rotation, the filaments distributed above and below will shear and eliminate air bubbles, avoiding excessive air bubbles from affecting the quality of the raw materials and meeting the requirements for precise subsequent proportioning.

[0027] like Figure 3As shown: In this embodiment, to further realize the independent use capability of individual cylinder control, further ensure the reasonable distribution of heat source and automation effect, and at the same time take into account the problem of excess glue residue and solidification in the discharge pipe 326, which would affect the accuracy of subsequent material proportioning and weight, the present invention further adopts a preferred technical solution: electromagnetic switch valves 36 are provided on both the air inlet pipe 34 and the air outlet pipe 35. This arrangement facilitates automated switching control. A safety valve 37 is also provided on the air outlet pipe 35; this arrangement aims to achieve safe air pressure control. Furthermore, a return pipe 38 is provided on one side of the discharge pipe 326 of the material cylinder 3, above the high-precision metering pump 5. The output end of the return pipe 38 leads to the inner liner 31, and a gear pump 39 is also provided on the return pipe 38. A one-way valve 310 is also provided at the input end of the return pipe 38, ensuring a one-way conveying effect. The purpose of this design is to facilitate the recovery of residual raw material liquid on the discharge pipe between the electromagnetic switch valve and the high-precision metering pump 5, avoiding viscosity solidification caused by temperature loss. It also achieves high resource utilization efficiency and has high practical value. The liquid return structure design in this embodiment is only for material cylinders containing liquid, aiming to achieve resource recovery and pipeline cleaning.

[0028] like Figure 1 and Figure 4 As shown: To further achieve the rational and safe use of waste heat sources and avoid affecting the quality of the adhesive, it is necessary to carry out environmentally friendly purification treatment such as impurity removal and desulfurization adsorption, further improving the energy-saving and environmental protection effect of the mixing equipment, reducing electricity consumption, and effectively reducing the production cost of the enterprise's modifier preparation. The present invention further adopts a preferred technical solution: the input ends of the multiple air inlet pipes 34 are also equipped with a transfer box 317. Specifically, the low-pressure steam heat source is connected to the transfer box through a pipeline, and the transfer box is then connected to the corresponding air inlet pipe through pipe valve joints. Inside the transfer box 317, from left to right, are arranged millimeter-level filter screens 318, non-woven fabric 319, 10mm pore size activated carbon blocks 320, air filter cotton 321, 10-micron pore size activated carbon particles 322, and micron-level filter screens 323. The above filtration structures are wrapped together by the filter screens to form a whole, facilitating overall installation. A door 324 is provided on one side of the transfer box 317; this design facilitates the replacement and installation of new filter elements, ensuring the cleanliness of the airflow. Furthermore, the outer wall of the transfer box is equipped with thermal insulation cotton 311. This design aims to reduce heat loss and avoid the risk of injury from accidental contact. It also enables energy-saving and environmentally friendly reuse of waste heat, rational allocation of heat resources, and replacement of traditional electric heating methods, significantly reducing production costs.

[0029] like Figure 5As shown: In this embodiment, a preferred technical solution includes a shearing structure 7 inside the packing cylinder 4. This structure performs high-speed dispersion to pre-treat the micron-sized fillers, followed by low-speed shearing to disperse the nano-sized fillers and perform vibration grinding on the fillers. Specifically, a laser particle size analyzer 41 is also embedded inside the packing cylinder 4. This arrangement is for monitoring filler dispersion; the laser particle size analyzer 41 detects the fineness (≤5μm) in real time to prevent filler agglomeration. To further improve the intelligent processing effect of filler treatment, drying, and dispersion, resulting in a 50% increase in filler dispersibility, an agglomeration rate <5%, and batch stability CV <5%, the micron-sized fillers are first added for high-speed dispersion, followed by low-speed shearing of the nano-sized fillers to avoid nano-agglomeration. A preferred technical solution is further adopted in this invention: the shearing structure 7 includes a variable-speed motor 71, a rotating shaft 72, a crushing blade 73, and a vibration grinding component 74. The variable-speed motor 71 is mounted on the packing cylinder 4 via a bracket, and the variable-speed motor is a three-speed servo-controlled variable-speed motor. The rotating shafts 72 are vertically arranged inside the packing cylinder 4 and connected to the variable speed motor 71; the variable speed motor drives the rotating shafts to rotate synchronously. Multiple pulverizing blades 73 are arranged on the rotating shafts 72; this arrangement is for the purpose of shearing the packing material using the pulverizing blades.

[0030] like Figure 5 and Figure 6 As shown: In a preferred embodiment, the vibrating grinding element 74 includes a fixed sleeve 741, a steel wire rope 742, and a vibrating grinding ball 743. The fixed sleeve 741 is fixedly installed on the lower part of the rotating shaft 72; specifically, it is located below the lowest layer of crushing blades. One end of the steel wire rope 742 is connected to the fixed sleeve 741, and the other end is connected to the vibrating grinding ball 743. The purpose of this arrangement is that the steel wire rope has a certain rigidity (tensioned state) and a certain flexibility (bending in the untensioned state). The main purpose is to achieve friction (normal rotation) and impact (reversing lag impact) of the vibrating grinding ball on the packing material through a hysteresis mechanism during forward and reverse rotation operations, thereby achieving fine dispersion of the packing material. The steel wire rope 742 and the vibrating grinding ball 743 are matched and arranged in multiple sets in a ring. The length of the multiple steel wire ropes 742 gradually decreases in the clockwise direction, and the vibrating grinding ball 743 is also provided with particle protrusions 744. The purpose of this design is to achieve comprehensive and efficient dispersion of the packing material at the bottom using minimal structural design, further ensuring and improving the dispersibility of the packing. In a preferred embodiment, a multi-layered vibrating grinding ball structure can also be designed, such as... Figure 5 As shown, the grinding balls are arranged in three layers, one above the other, with four groups arranged in a ring within each layer. The lengths of the multiple steel wire ropes 742 distributed within the same layer gradually decrease in a clockwise direction. The length of the longest steel wire rope from top to bottom also gradually increases. This arrangement aims to enhance the grinding effect and improve the dispersion of the filler.

[0031] like Figure 1 and Figure 7 As shown: In this embodiment, the mixing cylinder 2 is equipped with a defoaming structure 8. Specifically, the defoaming structure 8 includes a central shaft 81, a defoaming plate 82, a branch shaft 83, a turning plate 84, and an ultrasonic generator 85. The central shaft 81 is vertically arranged in the mixing cylinder 2, and the defoaming plate 82 is arranged on the central shaft 81 and can rotate and move up and down along the central shaft 81. In order to further improve the uniform mixing of multiple raw material components in the mixing cylinder 2 and achieve optimized treatment of bubbles generated in the mixture, millimeter-level tangents 822 are used to enhance and eliminate bubbles, further improving the preparation quality of the toughening modifier and improving product consistency. The present invention further adopts a preferred technical solution: the defoaming plate 82 includes a rectangular frame 821 and tangents 822 arranged in the rectangular frame 821, wherein the tangents 822 are staggered and have a diameter of millimeters. Figure 8 As shown: A connecting plate 823 is provided on one side of the defoaming plate 82. Specifically, the connecting plate is fixedly connected to one side of the rectangular frame, and the two are perpendicularly distributed. One end of the connecting plate 823 is threadedly connected to the central shaft 81 through a rotating sleeve 824. The movements of the defoaming plate 82 and the turning plate 84 do not interfere with each other. With this arrangement, during the forward rotation of the central shaft, the rotating sleeve and the defoaming plate as a whole will move upward along the central shaft due to the threaded connection. During the reverse rotation of the central shaft, the rotating sleeve and the defoaming plate as a whole will move downward along the central shaft. The rotation is a tangential cutting operation of the defoaming plate on the mixture, and the up-and-down movement is a turning operation of the connecting plate on the upper and lower layers of the mixture. This combination greatly improves the uniformity of the mixture mixing, the consistency of heating, and the product quality. In a preferred embodiment, the area between the inner liner and the outer protective sleeve of the mixing cylinder can also be filled with water to achieve optimal temperature maintenance.

[0032] This mixing equipment employs a high-precision metering pump (error ≤ ±0.5%) for precise mixing control, avoiding errors from manual mixing. It precisely controls the temperature gradient of the mixed solution, maintaining a temperature of 60℃ during the mixing stage to ensure full compatibility of the coupling agent and filler. During the degassing stage, the temperature is maintained at 40℃ to reduce viscosity and thoroughly degas. A triple approach of tangential circular motion, ultrasonic degassing, and vacuum degassing is used to eliminate bubbles, ensuring a bubble rate of <0.1%. This further guarantees the high quality of the modifier preparation. This mixing equipment not only purifies the high-temperature waste heat airflow in the workshop and utilizes low-pressure steam waste heat, but also efficiently eliminates bubbles in the encapsulation structural adhesive raw materials and mixture through multiple methods, reducing the bubble production rate and significantly improving the quality and consistency of the encapsulation structural adhesive mixing preparation.

[0033] like Figure 7 and Figure 9 As shown: In this embodiment, there are multiple branch shafts 83 distributed around the central shaft 81, preferably a structure with four branch shafts. Specifically, both ends of the branch shafts are connected to the mixing cylinder via bearings. A turning plate 84 is disposed on the branch shafts 83, and the two are threadedly connected. An ultrasonic generator 85 is disposed within the cavities of the central shaft 81 and the branch shafts 83; this arrangement aims to enhance the bubble elimination effect through ultrasonic assistance. A drive structure 9 is also provided between the central shaft 81 and the branch shafts 83; to achieve a reasonable configuration within a limited space, a single drive motor 91 is used to drive the central defoaming plate 82 to rotate spirally and move up and down. This design is simple, has low manufacturing cost, and simultaneously facilitates the up-and-down movement of the mixture at multiple peripheral points, further improving the uniformity of mixing and the efficiency of defoaming treatment. The present invention further adopts a preferred technical solution: the drive structure 9 includes a drive motor 91, a main wheel 92, and a secondary wheel 93. The drive motor 91 is disposed on the mixing cylinder 2 and connected to the central shaft 81. The main wheel 92 is sleeved and installed on the central shaft 81, and the auxiliary wheel 93 is set on the branch shaft 83, and the main wheel 92 and the auxiliary wheel 93 are engaged for transmission.

[0034] With this setup, the drive motor's startup causes the central shaft to rotate synchronously. Simultaneously, the meshing rotation of the main and auxiliary wheels drives the branch shaft to rotate. The branch shaft and the tipping plate are also threaded together; therefore, the forward and reverse rotation of the branch shaft also causes the tipping plate to move up and down, creating a tumbling effect on the upper and lower layers of the mixture. In other words, the mixing drum has a material tumbling effect with a connecting plate at its center and multiple tipping plates along its inner edge. A vacuum tube 21 is also connected to the inner side of the mixing drum 2, and a vacuum pump 22 is installed on the vacuum tube 21. This setup aims to achieve the required vacuum level in the mixing drum through the vacuum pump, which not only improves the elimination of air bubbles but also ensures the quality of the mixing process for the modifier formulation. An industrial control computer 10 is also installed on the outside of the mixing drum 2. This industrial control computer can have a built-in PLC controller and works with a temperature probe and an electromagnetic switch valve to achieve reasonable heat source distribution and automated control. By connecting to a high-precision metering pump, the automated addition and control of materials to meet high-precision proportioning requirements is achieved. The mixing equipment utilizes waste heat from the melting process within the same workshop, followed by purification treatment. Simultaneously, the material cylinder's structural design is optimized, allowing direct application for preheating of raw materials, drying of fillers, and temperature control during the mixing stage. In the filler processing stage, materials are added in stages: first, micron-sized fillers are added for high-speed dispersion, then nano-sized fillers are added for low-speed shearing; the fineness is ≤2μm, avoiding nano-agglomeration. Furthermore, the batch stability (CV) for standardized temperature, rotation speed, and time is <5%. A discharge port is also provided at the bottom of the mixing cylinder for easy filling operations.

[0035] A method for preparing a mixing device for toughening modifiers of electronic packaging structural adhesives, wherein the above-mentioned mixing device is used to prepare the toughening modifiers of structural adhesives, and the preparation method is as follows: Step S1: First, turn on the stirring motor 313 to ensure the elastomer, coupling agent, and functional additives in the material cylinder 3 meet the preset flowability and viscosity requirements. Then, open the solenoid valve 36 of the air inlet pipe 34 to preheat the material cylinder 3, packing cylinder 4, and mixing cylinder 2 using low-pressure steam. Combined with the temperature probe 6 and the industrial control computer 10, the temperature of the corresponding cylinders is intelligently controlled and adjusted. This ensures the flowability and optimal state of the original liquid within the material cylinder.

[0036] Step S2: The next step is to initially add filler into the filler cylinder 4, ensuring the filler drying temperature is 100–120℃. Simultaneously start the variable speed motor 71, first adding micron-sized filler for high-speed dispersion, then adding nano-sized filler for low-speed shearing to avoid nano-agglomeration and achieve batch stability CV < 5%. High-speed dispersion is 300–500 rpm / 30 min; low-speed shearing is 80–100 rpm / 30 min. The synchronous forward and reverse rotation of the variable speed motor 71 drives the vibrating grinding ball 743 to switch between different directions and high-speed / low-speed rotation modes to complete the efficient vibrating grinding of the lower part of the filler. The fineness is detected in real time by the laser particle size analyzer 41, with a required fineness of ≤ 5 μm.

[0037] Step S3: The operator inputs the material proportioning parameters into the industrial control computer 10, using parts by weight: Elastomer main agent: 60–80; Coupling agent: 2–5; Functional additives: 8–30; Nanofiller: 0–5. Specific analysis: Taking the basic formulation (parts by weight) of a general toughening modifier as an example: Elastomer main agent: 60–80 (CTBN / PU / organosilicon / core-shell); Compatible / coupling agent: 2–5 (KH-560, titanate); Plasticizer: 5–20 (phthalate, polyether polyol); Stabilizer: 3–8 (antioxidant, light stabilizer); Nanofiller: 0–5 (nano SiO2, montmorillonite); Catalyst: 0–2 (organotin, tertiary amine). Among these, the catalyst, plasticizer, and stabilizer all belong to the functional additives category. Subsequently, under the signal feedback control of the industrial control computer and the high-precision metering pump 5, the elastomer main agent, functional additives, coupling agent, and nanofiller are sequentially added to the mixing cylinder 2. The drive motor 91 is started and maintained at 20-50 rpm / min, and the temperature is controlled at 60–80℃. Ultrasonic degassing at 40 kHz for 30 min and vacuum degassing at -0.09 MPa for 30 min are then initiated, resulting in a bubble rate of <0.1%. Ultimately, a high-precision, high-quality toughening modifier for encapsulating structural adhesives is obtained.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0039] It should be noted that, in specific embodiments of the present invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the use of phrases such as "comprising one" to define an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A mixing device for a toughening modifier of an electronic packaging structural adhesive, characterized in that: The system includes a vertically distributed support frame, with a mixing cylinder at the bottom of the support frame. Three material cylinders and a packing cylinder are also arranged in a ring above the mixing cylinder on the support frame. Each material cylinder includes an inner liner, an outer protective sleeve, and a fixing frame between them. The inner liner has an inlet pipe at its top and an outlet pipe at its bottom connected to the mixing cylinder. A high-precision metering pump is installed on the outlet pipe. A temperature probe is also installed on the side wall of the inner liner. An air inlet pipe is located at the bottom of the material cylinder, between the inner liner and the outer protective sleeve, and an air outlet pipe is located at its top. The air inlet pipe is connected to an external low-pressure steam heat source. The packing cylinder and mixing cylinder have the same structure as the material cylinder, and the packing cylinder also has a shearing structure to perform high-speed dispersion pretreatment of the micron-sized filler, followed by low-speed shearing. The system disperses nanofillers and performs vibration grinding on them. A laser particle size analyzer is also embedded inside the packing cylinder. The mixing cylinder has a degassing structure, which includes a central shaft, defoaming plates, branch shafts, a turning plate, and an ultrasonic generator. The central shaft is vertically arranged in the mixing cylinder, and the defoaming plates are located on the central shaft and can rotate and move up and down along the central shaft. There are multiple branch shafts centered on the central shaft, located in the mixing cylinder. The turning plate is located on the branch shaft, and the two are threaded together. The ultrasonic generator is located in the inner cavity of the central shaft and the branch shafts. A drive structure is also provided between the central shaft and the branch shafts. A vacuum tube is connected to the inside of the mixing cylinder, and a vacuum pump is installed on the vacuum tube. An industrial control computer is also located on the outside of the mixing cylinder.

2. The mixing equipment for the toughening modifier of the electronic packaging structural adhesive as described in claim 1, characterized in that: The support frame includes support legs, a first mounting ring, a connecting arm, a second mounting ring, and a third mounting ring; the support legs are vertically distributed and fixed to the first mounting ring by welding, the first mounting ring being used to connect to the mixing cylinder; the connecting arm is inclined and its bottom end is fixed to the first mounting ring, and its top end is connected to the second mounting ring; the diameter of the second mounting ring is larger than the diameter of the first mounting ring; multiple third mounting rings are evenly distributed and mounted on the second mounting ring.

3. The mixing equipment for the toughening modifier of the electronic packaging structural adhesive as described in claim 2, characterized in that: The third mounting ring consists of multiple rings evenly distributed vertically and is connected and fixed to the second mounting ring via a side shaft. The third mounting ring also includes two symmetrically distributed fastening plates, one side of which is hinged to the side shaft and the other side has a mounting hole. The mounting holes of the two fastening plates are connected and fixed by fastening bolts.

4. The mixing equipment for the toughening modifier of the electronic packaging structural adhesive as described in claim 3, characterized in that: Both the inlet and outlet pipes are equipped with electromagnetic switch valves, and the outlet pipe is also equipped with a safety valve; a return pipe is also provided on one side of the material cylinder's outlet pipe and above the high-precision metering pump. The output end of the return pipe leads to the inner liner, and a gear pump is also provided on the return pipe, while a one-way valve is also provided at the input end of the return pipe.

5. The mixing equipment for the toughening modifier of the electronic packaging structural adhesive as described in claim 4, characterized in that: The material cylinder is also equipped with a stirring structure, which includes a stirring motor, a stirring shaft, and stirring blades. The stirring motor is mounted on the material cylinder via a bracket, and the stirring shaft is vertically distributed in the material cylinder and connected to the stirring motor. The stirring blades are disposed on the stirring shaft, and a filament is provided between the two stirring blades distributed vertically.

6. The mixing equipment for the toughening modifier of the electronic packaging structural adhesive as described in claim 5, characterized in that: The shearing structure includes a variable speed motor, a rotating shaft, crushing blades, and a vibrating grinding element. The variable speed motor is mounted on the packing cylinder via a bracket. The rotating shaft is vertically arranged inside the packing cylinder and connected to the variable speed motor. There are multiple crushing blades, all mounted on the rotating shaft. The vibrating grinding element includes a fixed sleeve, a steel wire rope, and a grinding ball. The fixed sleeve is fixedly installed on the lower part of the rotating shaft. One end of the steel wire rope is connected to the fixed sleeve, and the other end is connected to the grinding ball. The steel wire rope and the grinding ball are matched and arranged in multiple sets in a ring. The length of the multiple steel wire ropes gradually decreases in a clockwise direction, and the grinding ball is also provided with particle protrusions.

7. The mixing equipment for the toughening modifier of the electronic packaging structural adhesive as described in claim 6, characterized in that: The defoaming board includes a rectangular frame and tangents set within the rectangular frame, wherein the tangents are staggered and have a diameter of millimeters; a connecting plate is provided on one side of the defoaming board, and one end of the connecting plate is threadedly connected to the central shaft through a rotating sleeve; the movement of the defoaming board and the turning plate do not interfere with each other.

8. The mixing equipment for the toughening modifier of the electronic packaging structural adhesive as described in claim 7, characterized in that: The drive structure includes a drive motor, a main wheel, and a secondary wheel; the drive motor is disposed on the mixing drum and connected to the central shaft; the main wheel is sleeved and installed on the central shaft, and the secondary wheel is disposed on the branch shaft, maintaining meshing and transmission between the main wheel and the secondary wheel.

9. The mixing equipment for the toughening modifier of the electronic packaging structural adhesive as described in claim 8, characterized in that: The input ends of the multiple air intake pipes are also equipped with a transfer box. The transfer box contains, from left to right, millimeter-sized filter screens, non-woven fabric, 10mm pore size activated carbon blocks, air filter cotton, 10-micron pore size activated carbon particles, and micron-sized filter screens. The transfer box has a door on one side and is also equipped with thermal insulation cotton on the outer wall.

10. A method for preparing a toughening modifier mixing device for electronic packaging structural adhesive, characterized in that: The structural adhesive toughening modifier was prepared using the aforementioned mixing equipment, and the preparation method is as follows: Step S1: First, turn on the stirring motor to achieve the preset flowability and viscosity requirements of the elastomer main agent, coupling agent, and functional additives in the material cylinder; and turn on the electromagnetic switch valve of the air inlet pipe to heat up the material cylinder, packing cylinder, and mixing cylinder through low-pressure steam heat, and intelligently control and adjust the temperature of the corresponding cylinders in conjunction with temperature probes and industrial control computers. Step S2: The next step is to initially add the filler into the filler cylinder, ensuring the filler drying temperature is 100–120℃; simultaneously turn on the variable speed motor, first add the micron filler for high-speed dispersion, then add the nano filler for low-speed shearing to avoid nano-agglomeration and achieve batch stability CV<5%; the high-speed dispersion is 300–500 rpm / 30min; the low-speed shearing is 80–100 rpm / 30min; the synchronous forward and reverse rotation of the variable speed motor will drive the vibrating mill ball to switch between different directions and high-speed and low-speed rotation modes to complete the vibrating milling of the filler, and the fineness is detected in real time by a laser particle size analyzer, with a fineness requirement of ≤5μm; Step S3: The operator inputs the material proportioning parameters via an industrial control computer, specifying the following weight ratios: elastomer main agent: 60–80; coupling agent: 2–5; functional additives: 8–30; nanofiller: 0–5. Then, under the feedback control of a high-precision metering pump, the elastomer main agent, functional additives, coupling agent, and nanofiller are sequentially added to the mixing cylinder. The drive motor is started and maintained at 20–50 rpm / min, and the temperature is controlled at 60–80℃. Ultrasonic degassing at 40 kHz for 30 minutes and vacuum degassing at -0.09 MPa for 30 minutes are also activated, resulting in a bubble rate of <0.1%. Finally, a high-precision proportioned, high-quality toughening modifier for encapsulating structural adhesives is obtained.

Images