Preparation device and process of high-stability water-based acrylic pressure-sensitive adhesive

Abstract

The application relates to the technical field of chemical production equipment, in particular to a high-stability water-based acrylic pressure-sensitive adhesive preparation device and process, which comprises a supporting assembly, a stirring assembly and a heat exchange assembly, the supporting assembly provides a structural basis, the stirring assembly drives a scraper to remove adhesions on the inner wall and mix materials through a linkage mechanism, and the heat exchange assembly realizes double efficient temperature control inside and outside by using a circulating pump, a spiral pipe and a liquid distribution channel. The application can effectively solve the problem of poor colloid stability caused by uneven mixing, inner wall adhesion and poor heat dissipation, and improve the product quality consistency.

Description

Technical Field

[0001] This invention relates to the field of chemical production equipment technology, and in particular to a device and process for preparing a highly stable water-based acrylic pressure-sensitive adhesive. Background Technology

[0002] Water-based acrylic pressure-sensitive adhesives have wide applications in packaging, labeling, and medical supplies due to their environmentally friendly properties and excellent bonding performance.

[0003] In the prior art, a reactor device with a stirring mechanism and an external jacket cooling structure is usually used to achieve the mixing of raw materials and control of reaction temperature.

[0004] However, existing technologies still suffer from poor batch stability of colloids due to uneven material mixing, severe adhesion to the inner wall, and insufficient heat dissipation efficiency during the preparation process. Summary of the Invention

[0005] The purpose of this invention is to provide a high-stability waterborne acrylic pressure-sensitive adhesive preparation device and process, which can solve the technical problems of poor batch stability of the adhesive due to uneven material mixing, severe adhesion on the inner wall and insufficient heat dissipation efficiency in the preparation process of the prior art.

[0006] The first aspect of this application provides a high-stability waterborne acrylic pressure-sensitive adhesive preparation apparatus, including a support assembly, a stirring assembly, and a heat exchange assembly. The support assembly includes a base, a support frame, a support shell, and a feeder. The support frame is fixed to the base, the support shell is disposed on the support frame, and the feeder is disposed on the support shell. The stirring assembly includes a stirrer, a scraper, and a heat dissipation structure. The stirrer is rotatably disposed inside the support shell, the scraper is disposed on one side of the stirrer for scraping the inner wall of the support shell, and the heat dissipation structure is disposed on the outer side of the support shell. The heat exchange assembly includes a circulating pump, a spiral tube, a heat exchange box, a liquid distribution channel, and an inlet pipe. The inlet pipe is connected to the support shell, the circulating pump is connected to the inlet pipe, the spiral tube is connected to the circulating pump, the heat exchange box is disposed on the outer side of the spiral tube, and the liquid distribution channel is disposed inside the support shell and connected to the spiral tube.

[0007] The agitator includes a stirring motor, a stirring rod, and stirring blades. The stirring rod is rotatably mounted inside the support shell, and the stirring blades are fixedly connected to the stirring rod and located on one side of the stirring rod. The output end of the stirring motor is connected to the stirring rod.

[0008] The scraper includes a scraper rod, a gear ring, a drive gear, and a transmission gear set. The gear ring is rotatably mounted inside the support shell. The scraper rod is fixed below the gear ring and contacts the support shell. The drive gear is fixed to the stirring rod. The transmission gear set meshes with the gear ring and the drive gear.

[0009] The stirring assembly also includes a protective shell, which is located on the outside of the transmission gear set.

[0010] The heat dissipation structure includes a heat dissipation layer and multiple first heat dissipation fins. The heat dissipation layer is disposed on the outside of the support shell, and the multiple first heat dissipation fins are disposed on the outside of the heat dissipation layer.

[0011] The stirring assembly also includes a temperature detection structure, which comprises a temperature detection unit, a judgment unit, and a control unit. The temperature detection unit is mounted on the support shell, the judgment unit is connected to the temperature detection unit, the control unit is connected to the judgment unit, and is connected to the circulating pump.

[0012] The heat exchange box includes a box body, a cooler, multiple second heat sinks and a return pipe. The cooler is fixed on the box body, the multiple second heat sinks are installed on the box body, and the return pipe is connected to the spiral pipe and the liquid distribution channel.

[0013] The liquid distribution channel includes a liquid distribution channel body and multiple liquid outlet pipes. The liquid distribution channel body is connected to the return pipe, and the multiple liquid outlet pipes are connected to the liquid distribution channel body and located around the liquid distribution channel body.

[0014] The inlet of the liquid inlet pipe is equipped with a filter screen, and a brush rod is also installed on the scraper, with the brush rod corresponding to the filter screen.

[0015] The second aspect of this application provides a process for preparing a highly stable waterborne acrylic pressure-sensitive adhesive, comprising: The water-based acrylic pressure-sensitive adhesive raw material is fed into the support shell through the feeder, and the base and support frame provide stable support. When the agitator is started, the agitator motor drives the agitator rod and agitator blade to rotate inside the support shell, shearing and mixing the materials; at the same time, the drive gear fixed on the agitator rod drives the gear ring to rotate through the transmission gear set, driving the scraper to move along the inner wall of the support shell to scrape off the adhering materials in real time. Start the circulating pump to drive the heat exchange medium to be drawn in from the support shell through the inlet pipe. After being filtered by the filter screen, the medium enters the spiral tube and is cooled by the cooler and the second heat sink in the heat exchange box. The cooled medium enters the distribution channel body through the return pipe and flows back evenly to the inside of the support shell through multiple outlet pipes to circulate and cool the material. The temperature signal inside the support shell is collected in real time by the temperature detection unit. After analysis by the judgment unit, the power of the circulation pump is adjusted by the control unit to realize closed-loop automatic control of the reaction temperature. During the mixing and heat exchange process, external auxiliary heat dissipation is achieved through the heat dissipation layer on the outside of the support shell and the first heat dissipation fin; at the same time, the movement of the scraper drives the brush to clean the filter screen at the inlet of the liquid inlet pipe, keeping the medium flowing smoothly, and finally producing a highly stable water-based acrylic pressure-sensitive adhesive.

[0016] This application provides a high-stability waterborne acrylic pressure-sensitive adhesive preparation device and process. This solution integrates a support assembly, a stirring assembly, and a heat exchange assembly to construct a closed-loop temperature-controlled mixing system. The support shell serves as the reaction vessel, and a feeder ensures precise raw material addition. A stirring motor drives the stirring rod to rotate the stirring blades, generating a shear flow field. Simultaneously, a drive gear and transmission gear set transmit power to a gear ring, causing a scraper to move circumferentially against the inner wall of the support shell. This removes adhering materials in real time during mixing, preventing localized overheating and dead zones. Furthermore, the heat exchange assembly uses a circulating pump to drive the medium through a spiral tube to exchange heat with the heat exchange box. The medium is then evenly injected into the support shell at multiple points via a distribution channel. Combined with an external heat dissipation layer and a first heat sink, convective heat dissipation is enhanced, achieving efficient and uniform temperature control of the reaction system. This effectively solves the technical problems of poor batch stability of the colloid due to uneven material mixing, severe adhesion to the inner wall, and insufficient heat dissipation efficiency in existing technologies. Therefore, it avoids gelation or performance fluctuations in the colloid, improving product consistency and production reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a structural diagram of the apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive according to the first embodiment of the present invention.

[0019] Figure 2 This is a left-side structural diagram of the high-stability waterborne acrylic pressure-sensitive adhesive preparation apparatus according to the first embodiment of the present invention.

[0020] Figure 3 This is a cross-sectional structural diagram of the high-stability waterborne acrylic pressure-sensitive adhesive preparation apparatus according to the first embodiment of the present invention.

[0021] Figure 4 yes Figure 3 A magnified view of detail A; Figure 5 yes Figure 3 A magnified view of detail B.

[0022] Base 101, support frame 102, support shell 103, feeder 104, stirrer 105, scraper 106, heat dissipation structure 107, circulating pump 108, spiral tube 109, heat exchange box 110, liquid distribution channel 111, liquid inlet pipe 112, stirring motor 113, stirring rod 114, stirring blade 115, scraper 116, gear ring 117, drive gear 118, transmission gear set 119, protective shell 120, heat dissipation layer 121, first heat dissipation fin 122, temperature detection unit 123, judgment unit 124, control unit 125, housing 126, cooler 127, second heat dissipation fin 128, return pipe 129, liquid distribution channel body 130, liquid outlet pipe 131, filter screen 132. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0024] First embodiment: To achieve the aforementioned objectives, this invention provides a highly stable water-based acrylic pressure-sensitive adhesive preparation apparatus. Its overall technical solution is as described in the embodiments of this application, mainly comprising the following core technical elements: a support assembly, a stirring assembly, and a heat exchange assembly. These technical elements work together to constitute the overall technical solution of this invention.

[0025] Please see Figures 1-5 This invention provides a high-stability waterborne acrylic pressure-sensitive adhesive preparation apparatus, comprising a support assembly, a stirring assembly, and a heat exchange assembly. The support assembly includes a base 101, a support frame 102, a support shell 103, and a feeder 104. The support frame 102 is fixed to the base 101, the support shell 103 is disposed on the support frame 102, and the feeder 104 is disposed on the support shell 103. The stirring assembly includes a stirrer 105, a scraper 106, and a heat dissipation structure 107. The stirrer 105 is rotatably disposed within the support shell 103, and the scraper 106 is disposed within the support shell 107. One side of the stirrer 105 is used to scrape the inner wall of the support shell 103, and the heat dissipation structure 107 is disposed on the outer side of the support shell 103. The heat exchange assembly includes a circulation pump 108, a spiral tube 109, a heat exchange box 110, a liquid distribution channel 111, and an inlet pipe 112. The inlet pipe 112 is connected to the support shell 103, the circulation pump 108 is connected to the inlet pipe 112, the spiral tube 109 is connected to the circulation pump 108, the heat exchange box 110 is disposed on the outer side of the spiral tube 109, and the liquid distribution channel 111 is disposed inside the support shell 103 and is connected to the spiral tube 109.

[0026] In this invention, a stable installation foundation is provided by setting up a support component. The stirring component achieves uniform mixing of materials and prevents them from sticking to the walls within the support shell 103. The heat exchange component drives the heat exchange medium through the circulating pump 108 to exchange heat through the spiral tube 109 and the heat exchange box 110, and then returns it to the inside of the support shell 103 through the liquid distribution channel 111. Together with the external heat dissipation structure 107, a dual internal and external temperature control system is formed. This solves the problem of poor colloidal stability caused by uneven mixing and poor heat dissipation in the preparation of existing water-based acrylic pressure-sensitive adhesives. Its beneficial effects are that it achieves precise control of reaction temperature and efficient mixing of materials, significantly improving the batch consistency and chemical stability of pressure-sensitive adhesive products. For example, the support shell 103 can be made of stainless steel to enhance corrosion resistance, or a support shell 103 with an insulation jacket can be used to adapt to production needs under different ambient temperatures.

[0027] The high-stability waterborne acrylic pressure-sensitive adhesive preparation apparatus of this application achieves thorough shear mixing of materials during the colloid preparation process through the synergistic action of multiple components, including a support component, a stirring component, and a heat exchange component. Simultaneously, a scraper 106 continuously removes material adhering to the inner wall to reduce thermal resistance. Furthermore, the spiral tube 109 and the distribution channel 111 in the heat exchange component form a closed-loop circulation, which, combined with the external heat dissipation structure 107, accelerates heat dissipation, ensuring timely removal of reaction heat. Therefore, this apparatus significantly improves the temperature control accuracy and mixing uniformity during the preparation of waterborne acrylic pressure-sensitive adhesives, effectively solving the problem of product quality fluctuations caused by localized overheating or uneven mixing in existing technologies.

[0028] The stirrer 105 includes a stirring motor 113, a stirring rod 114, and stirring blades 115. The stirring rod 114 is rotatably mounted inside the support housing 103. The stirring blades 115 are fixedly connected to the stirring rod 114 and located on one side of the stirring rod 114. The output end of the stirring motor 113 is connected to the stirring rod 114. In this invention, by setting the stirring motor 113 as an independent power source and directly driving the stirring rod 114 to rotate the stirring blades 115 through its output end, stable and adjustable stirring power can be provided, thereby enhancing the controllability and reliability of the mixing process. Its beneficial effect is that it ensures the stability of the connection between the stirring rod 114 and the blades, preventing loosening or abnormal vibration under long-term high-load operation, and improving the overall service life of the device. For example, a variable frequency speed control motor can be used as the stirring motor 113 to adapt to the stirring speed requirements of different reaction stages, or a stirring motor 113 with a reducer can be used to increase the output torque.

[0029] The scraper 106 includes a scraper 116, a gear ring 117, a drive gear 118, and a transmission gear set 119. The gear ring 117 is rotatably disposed inside the support shell 103. The scraper 116 is fixed below the gear ring 117 and contacts the support shell 103. The drive gear 118 is fixed to the stirring rod 114. The transmission gear set 119 meshes with the gear ring 117 and the drive gear 118. In this invention, by fixing the drive gear 118 to the stirring rod 114 and using the transmission gear set 119 to drive the gear ring 117 to rotate, thereby driving the scraper 116 to move along the inner wall of the support shell 103, the scraper 106 and the stirrer 105 share power and synchronize their operation. This solves the problem of the complex structure caused by the need for additional power to drive the scraping mechanism. Its beneficial effects are that it automatically removes the accumulated material on the inner wall while stirring, preventing material coking and improving heat exchange efficiency, while saving equipment space and energy consumption. For example, the transmission gear set 119 can use spur gear transmission to simplify manufacturing costs, or bevel gear transmission to change the transmission direction to adapt to a compact spatial layout.

[0030] The stirring assembly also includes a protective shell 120, which is disposed outside the transmission gear set 119. In this invention, by providing a protective shell 120 outside the transmission gear set 119, the precision gear transmission mechanism can be isolated from the external environment, thereby preventing dust, liquid splashes, or foreign objects from entering the gear meshing surface. The beneficial effects include effectively reducing gear wear and the risk of jamming, reducing operating noise, and extending the maintenance cycle and service life of the transmission system. For example, the protective shell 120 can be made of transparent polycarbonate material to facilitate observation of the gear operating status, or a metal protective shell 120 with sealing strips can be used to enhance the protection level.

[0031] The heat dissipation structure 107 includes a heat dissipation layer 121 and a plurality of first heat dissipation fins 122. The heat dissipation layer 121 is disposed on the outside of the support shell 103, and the plurality of first heat dissipation fins 122 are disposed on the outside of the heat dissipation layer 121. In this invention, by disposing of a heat dissipation layer 121 on the outside of the support shell 103 and arranging a plurality of first heat dissipation fins 122 thereon, the surface area of ​​the support shell 103 in contact with the surrounding environment can be significantly increased, thereby enhancing the heat dissipation effect under natural convection or forced air cooling conditions. Its beneficial effect is that it assists the heat exchange components in quickly removing the heat generated by the reaction, preventing the local temperature of the support shell 103 from becoming too high, and further improving the overall temperature control capability of the device. For example, the first heat dissipation fins 122 can be evenly distributed in a ring on the outside of the heat dissipation layer 121 to optimize the airflow path, or the first heat dissipation fins 122 can be made of aluminum alloy to improve thermal conductivity.

[0032] The stirring assembly also includes a temperature detection structure, comprising a temperature detection unit 123, a judgment unit 124, and a control unit 125. The temperature detection unit 123 is mounted on the support shell 103, the judgment unit 124 is connected to the temperature detection unit 123, and the control unit 125 is connected to the judgment unit 124 and the circulating pump 108. In this invention, by setting the temperature detection unit 123 to collect the temperature signal inside the support shell 103 in real time, and after analysis and processing by the judgment unit 124, the control unit 125 automatically adjusts the working state of the circulating pump 108, thereby achieving closed-loop automatic control of the reaction temperature. This solves the problems of delayed response and low accuracy in manual temperature control, and its beneficial effect is that it ensures that the reaction process is always within the optimal temperature range, improving the repeatability of the process and the consistency of the product. For example, the temperature detection unit 123 can use a Pt100 resistance thermometer to provide a high-precision temperature feedback signal, or the control unit 125 can use a PID control algorithm to achieve precise adjustment of the flow rate of the circulating pump 108.

[0033] The heat exchange box 110 includes a box body 126, a cooler 127, multiple second heat sinks 128, and a return pipe 129. The cooler 127 is fixed on the box body 126, and the multiple second heat sinks 128 are disposed on the box body 126. The return pipe 129 is connected to the spiral tube 109 and to the distribution channel 111. In this invention, by integrating the cooler 127 and multiple second heat sinks 128 on the box body 126 and connecting the spiral tube 109 and the distribution channel 111 using the return pipe 129, a highly efficient heat exchange medium circulation and cooling system can be constructed. This solves the problem of reduced heat exchange efficiency due to the temperature rise caused by heat absorption during the circulation process. Its beneficial effect is that it ensures that the medium returning to the distribution channel 111 has a sufficient temperature difference, maintaining a continuous and stable heat exchange capacity. For example, the cooler 127 can be a semiconductor cooler to achieve rapid cooling, or the second heat sinks 128 can be used in conjunction with a cooling fan to enhance the forced convection cooling effect.

[0034] The distribution channel 111 includes a distribution channel body 130 and multiple outlet pipes 131. The distribution channel body 130 is connected to the return pipe 129, and the multiple outlet pipes 131 are connected to the distribution channel body 130 and located around the distribution channel body 130. In this invention, by setting the distribution channel body 130 to collect the return medium and discharge it through multiple outlet pipes 131 distributed around the perimeter, the heat exchange medium can be uniformly transported to different areas inside the support shell 103, thereby solving the problem of uneven internal temperature distribution caused by single-point liquid inlet. Its beneficial effect is that it achieves uniformity of the internal temperature field of the support shell 103, avoiding the adverse effects of local overheating or undercooling on the colloidal polymerization reaction. For example, the outlet direction of the outlet pipe 131 can be set to be obliquely downward to guide the medium to flow into the depth of the reactants, or the diameter of the outlet pipe 131 can be gradually reduced along the medium flow direction to maintain a consistent flow rate at each outlet.

[0035] A filter screen 132 is installed at the inlet of the liquid inlet pipe 112, and a brush rod is also installed on the scraper 116, with the brush rod corresponding to the filter screen 132. In this invention, by setting a filter screen 132 at the inlet of the liquid inlet pipe 112 to intercept impurities, and installing a brush rod corresponding to the filter screen 132 on the scraper 116, the rotational movement of the scraper 116 drives the brush rod to automatically clean the filter screen 132. This prevents impurities from entering the circulation system and clogging the pipes, while simultaneously achieving self-cleaning of the filter screen 132. This solves the problem of frequent shutdowns for cleaning the filter screen 132 affecting production continuity. Its beneficial effects include extending the continuous operating time of the device, reducing maintenance costs, and ensuring smooth flow of the heat exchange medium. For example, the bristles of the brush rod can be made of wear-resistant nylon to withstand long-term friction, or the distance between the brush rod and the filter screen 132 can be designed as an adjustable structure to control the cleaning force. Example

[0036] A second aspect of the present invention provides a process for preparing a highly stable waterborne acrylic pressure-sensitive adhesive, using the apparatus for preparing a highly stable waterborne acrylic pressure-sensitive adhesive as described in any of the above embodiments, comprising the following steps: S201 uses a feeder to feed water-based acrylic pressure-sensitive adhesive raw material into the support shell, and provides stable support through the base and support frame; The water-based acrylic pressure-sensitive adhesive raw material is fed into the support shell through the feeder, and the base and support frame provide stable support.

[0037] In this step, the support assembly serves as the fundamental load-bearing unit for the entire preparation process. Its base cooperates with the support frame to ensure the structural stability of the reaction vessel during subsequent high-speed stirring and heat exchange processes. This prevents equipment vibration from affecting mixing accuracy or causing safety hazards, and provides a closed and stable space for the material reaction. S202 starts the agitator, and the agitator motor drives the agitator rod and agitator blade to rotate inside the support shell to shear and mix the materials; at the same time, the drive gear fixed on the agitator rod drives the gear ring to rotate through the transmission gear set, driving the scraper to move along the inner wall of the support shell to scrape off the adhering materials in real time. When the agitator is started, the agitator motor drives the agitator rod and agitator blade to rotate inside the support shell, shearing and mixing the materials. At the same time, the drive gear fixed on the agitator rod drives the gear ring to rotate through the transmission gear set, driving the scraper to move along the inner wall of the support shell and scrape off the adhering materials in real time.

[0038] This step achieves simultaneous mixing and anti-sticking. The stirring motor, acting as an independent power source, drives the stirring blades to rotate via the stirring rod, applying shear force to the material within the support shell and promoting uniform dispersion of the components. Simultaneously, the power output from the stirring rod, through the meshing of the drive gear and transmission gear set, drives the gear ring and the fixed scraper below to rotate. The scraper moves closely against the inner wall of the support shell, effectively scraping away material that has adhered to the wall surface, thus solving the problems of increased thermal resistance, uneven material mixing, and localized coking caused by high-viscosity colloids sticking to the wall, ensuring the uniformity of the material flow field within the reactor.

[0039] S203 starts the circulating pump, driving the heat exchange medium to be drawn in from the support shell through the inlet pipe. After being filtered by the filter screen, the medium enters the spiral tube and is cooled by the cooler and the second heat sink in the heat exchange box. The cooled medium enters the distribution channel body through the return pipe and flows back evenly to the inside of the support shell through multiple outlet pipes to circulate and cool the material. Start the circulating pump to drive the heat exchange medium to be drawn in from the support shell through the inlet pipe. After being filtered by the filter screen, the medium enters the spiral tube and is cooled by the cooler and the second heat sink in the heat exchange box. The cooled medium enters the distribution channel body through the return pipe and flows back evenly to the inside of the support shell through multiple outlet pipes to circulate and cool the material.

[0040] A circulating pump provides power to extract the medium after it has absorbed the heat of reaction, and filters out any impurities that may have entered. After entering the spiral tube, the medium is rapidly cooled within the heat exchange chamber by a combination of active cooling from the cooler and passive cooling from the second heat sink. The cooled medium then enters the distribution channel body through a return pipe, and is uniformly returned to the interior of the support shell via multiple outlet pipes distributed around the perimeter in a multi-point spray pattern. This multi-point return design avoids internal temperature differences caused by single-point liquid entry, ensures a uniform temperature distribution of the reaction system within the support shell, and effectively removes the exothermic reaction generated by polymerization.

[0041] S204 collects the temperature signal inside the support shell in real time through the temperature detection unit. After analysis by the judgment unit, the control unit adjusts the power of the circulation pump to achieve closed-loop automatic control of the reaction temperature. The temperature signal inside the support shell is collected in real time by the temperature detection unit. After analysis by the judgment unit, the power of the circulation pump is adjusted by the control unit to realize closed-loop automatic control of the reaction temperature.

[0042] The temperature detection unit monitors the thermal state of the reaction system in real time and feeds the signal back to the judgment unit. The judgment unit compares the real-time temperature with the set process curve, and the control unit dynamically adjusts the speed or power of the circulating pump based on the temperature difference signal, thereby changing the flow rate and volume of the heat exchange medium. This closed-loop feedback regulation mechanism overcomes the shortcomings of traditional manual temperature control, such as lag and low accuracy, ensuring that the reaction process is always within the optimal temperature range and significantly improving batch consistency of the product.

[0043] During the mixing and heat exchange process, S205 uses the heat dissipation layer on the outside of the support shell and the first heat sink for external auxiliary heat dissipation. At the same time, the movement of the scraper drives the brush to clean the filter screen at the inlet of the liquid inlet pipe, keeping the medium flowing smoothly, and finally producing a highly stable water-based acrylic pressure-sensitive adhesive.

[0044] During the mixing and heat exchange process, external auxiliary heat dissipation is achieved through the heat dissipation layer on the outside of the support shell and the first heat dissipation fin; at the same time, the movement of the scraper drives the brush to clean the filter screen at the inlet of the liquid inlet pipe, keeping the medium flowing smoothly, and finally producing a highly stable water-based acrylic pressure-sensitive adhesive.

[0045] The externally designed heat dissipation layer and first heat sink increase the heat dissipation area of ​​the outer surface of the support shell, forming a dual internal and external temperature control system with the internal heat exchange components, further improving temperature control efficiency. Furthermore, as the scraper rotates with the gear ring, the brush rod mounted on it simultaneously sweeps across the filter screen surface at the inlet of the liquid inlet pipe, achieving real-time mechanical cleaning of the filter screen. This prevents clumps or gels in the raw materials from clogging the filter screen, ensuring unobstructed circulation of the heat exchange medium, reducing the frequency of downtime for cleaning, and ultimately producing a uniformly mixed, chemically stable water-based acrylic pressure-sensitive adhesive product.

[0046] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. A device for preparing a highly stable water-based acrylic pressure-sensitive adhesive, characterized in that, It includes a support assembly, a stirring assembly, and a heat exchange assembly. The support assembly includes a base, a support frame, a support shell, and a feeder. The support frame is fixed to the base, the support shell is disposed on the support frame, and the feeder is disposed on the support shell. The stirring assembly includes a stirrer, a scraper, and a heat dissipation structure. The stirrer is rotatably disposed inside the support shell. The scraper is disposed on one side of the stirrer and is used to scrape the inner wall of the support shell. The heat dissipation structure is disposed on the outer side of the support shell. The heat exchange assembly includes a circulating pump, a spiral tube, a heat exchange box, a liquid distribution channel, and an inlet pipe. The inlet pipe is connected to the support shell, the circulating pump is connected to the inlet pipe, the spiral tube is connected to the circulating pump, the heat exchange box is located outside the spiral tube, and the liquid distribution channel is located inside the support shell and is connected to the spiral tube.

2. The apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive as described in claim 1, characterized in that, The stirrer includes a stirring motor, a stirring rod, and stirring blades. The stirring rod is rotatably disposed inside the support shell. The stirring blades are fixedly connected to the stirring rod and located on one side of the stirring rod. The output end of the stirring motor is connected to the stirring rod.

3. The apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive as described in claim 2, characterized in that, The scraper includes a scraper rod, a gear ring, a drive gear, and a transmission gear set. The gear ring is rotatably disposed inside the support shell. The scraper rod is fixed below the gear ring and contacts the support shell. The drive gear is fixed to the stirring rod. The transmission gear set meshes with the gear ring and the drive gear.

4. The apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive as described in claim 3, characterized in that, The stirring assembly also includes a protective shell, which is disposed on the outside of the transmission gear set.

5. The apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive as described in claim 4, characterized in that, The heat dissipation structure includes a heat dissipation layer and a plurality of first heat dissipation fins. The heat dissipation layer is disposed on the outside of the support shell, and the plurality of first heat dissipation fins are disposed on the outside of the heat dissipation layer.

6. The apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive as described in claim 5, characterized in that, The stirring assembly also includes a temperature detection structure, which includes a temperature detection unit, a judgment unit, and a control unit. The temperature detection unit is disposed on the support shell, the judgment unit is connected to the temperature detection unit, the control unit is connected to the judgment unit, and is connected to the circulation pump.

7. The apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive as described in claim 6, characterized in that, The heat exchange box includes a box body, a cooler, multiple second heat dissipation fins, and a return pipe. The cooler is fixed on the box body, the multiple second heat dissipation fins are disposed on the box body, and the return pipe is connected to the spiral tube and the liquid distribution channel.

8. The apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive as described in claim 7, characterized in that, The liquid distribution channel includes a liquid distribution channel body and multiple liquid outlet pipes. The liquid distribution channel body is connected to the return pipe, and the multiple liquid outlet pipes are connected to the liquid distribution channel body and located around the liquid distribution channel body.

9. The apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive as described in claim 8, characterized in that, A filter screen is installed at the inlet of the liquid inlet pipe, and a brush rod is also installed on the scraper rod, with the brush rod positioned corresponding to the filter screen.

10. A process for preparing a high-stability waterborne acrylic pressure-sensitive adhesive, characterized by employing the apparatus for preparing a high-stability waterborne acrylic pressure-sensitive adhesive as described in any one of claims 1-9, wherein... include: The water-based acrylic pressure-sensitive adhesive raw material is fed into the support shell through the feeder, and the base and support frame provide stable support. When the agitator is started, the agitator motor drives the agitator rod and agitator blade to rotate inside the support shell, shearing and mixing the materials; at the same time, the drive gear fixed on the agitator rod drives the gear ring to rotate through the transmission gear set, driving the scraper to move along the inner wall of the support shell to scrape off the adhering materials in real time. Start the circulating pump to drive the heat exchange medium to be drawn in from the support shell through the inlet pipe. After being filtered by the filter screen, the medium enters the spiral tube and is cooled by the cooler and the second heat sink in the heat exchange box. The cooled medium enters the distribution channel body through the return pipe and flows back evenly to the inside of the support shell through multiple outlet pipes to circulate and cool the material. The temperature signal inside the support shell is collected in real time by the temperature detection unit. After analysis by the judgment unit, the power of the circulation pump is adjusted by the control unit to realize closed-loop automatic control of the reaction temperature. During the mixing and heat exchange process, external auxiliary heat dissipation is achieved through the heat dissipation layer on the outside of the support shell and the first heat dissipation fin; at the same time, the movement of the scraper drives the brush to clean the filter screen at the inlet of the liquid inlet pipe, keeping the medium flowing smoothly, and finally producing a highly stable water-based acrylic pressure-sensitive adhesive.

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