A high-pressure temperature-controlled stirring barrel for nano-SiO2 / starch-based composite adhesive

Abstract

The utility model provides a kind of high-pressure temperature control stirring barrel for nano SiO2 / starch-based composite adhesive, including barrel body, barrel cover and stirring paddle assembly;Barrel cover is detachably sealed with barrel body, barrel body and barrel cover are enclosed into the stirring space of stirring barrel, barrel cover is provided with raw material inlet and nano SiO2 supplement port 220 and stirring space intercommunication, barrel body bottom is provided with discharge port and stirring space intercommunication;Stirring paddle assembly includes anchor type stirring paddle, turbine type dispersion paddle and helical type flow guide paddle, which are sequentially arranged from bottom to top, anchor type stirring paddle is arranged on the barrel bottom and barrel wall of inner barrel body, helical type flow guide paddle is vertically arranged to generate up-down direction flow guiding effect, turbine type dispersion paddle is used to generate radial shear force and / or turbulent effect when rotating, to break up the agglomerates of nano SiO2, and make it uniformly dispersed in starch paste matrix;Further comprising a coolant circulation system for heating the stirred material by heat medium and cooling the stirred material by coolant medium, and the heat medium and coolant are heat-carrying fluids.

Description

Technical Field

[0001] This utility model relates to the technical field of adhesive production equipment, specifically to a high-pressure temperature-controlled mixing tank for nano-SiO2 / starch-based composite adhesives. Background Technology

[0002] In the preparation of nano-SiO2 / starch-based composite adhesives, the boiling of sodium silicate water glass and the gelatinization of starch must be completed simultaneously under high pressure at 100℃-140℃. Simultaneously, the problems of excessively high viscosity when starch gelatinization is sufficient and the easy agglomeration of nano-SiO2 must be addressed (e.g., CN107099263B). However, existing mixing tanks generally have the following defects: The mixing structure is simple, mostly a single blade design, which makes it difficult to balance the requirements of material mixing uniformity and anti-agglomeration. This can easily lead to uneven starch gelatinization and nano-SiO2 agglomeration, affecting the water resistance and bonding strength of the adhesive. If the temperature control accuracy is low or there is no temperature control at all, and the local temperature difference exceeds 5°C, the water glass may be overcooked or the starch may not be fully gelatinized, which will not meet the precise reaction conditions required by the nano-SiO2 / starch-based composite adhesive. Summary of the Invention

[0003] Based on the above, a high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives is provided to achieve stable reactions under high pressure and high temperature conditions, solve the problems of high viscosity due to starch gelatinization and agglomeration of nano-SiO2, and ensure the quality and efficiency of adhesive preparation.

[0004] A high-pressure temperature-controlled mixing tank for nano-SiO2 starch-based composite adhesives includes a tank body, a tank lid, and a mixing paddle assembly. The tank lid is detachably and sealed to the tank body, and the tank body and the tank lid enclose a mixing space within the mixing tank. The tank lid is provided with a raw material inlet and a nano-SiO2 replenishment port 220 communicating with the mixing space. The bottom of the tank body is provided with a discharge port communicating with the mixing space. The mixing paddle assembly includes, from bottom to top, an anchor-type mixing paddle, a turbine-type dispersing paddle, and a spiral guide paddle. The stirring paddle is fitted to the bottom and walls of the container. The vertically positioned spiral guide paddle provides vertical flow guidance, while the turbine-type dispersing paddle generates radial shear force and / or turbulence during rotation, breaking up the agglomerates of nano-SiO2 and dispersing them uniformly within the starch paste matrix. The system also includes a heat medium circulation system and a cold medium circulation system. The heat medium circulation system heats the stirred material using a heat medium, while the cold medium circulation system cools it using a cold medium. Both the heat medium and cold medium are heat-carrying fluids. This three-layer coaxial stirring structure, with different paddle types and rotation speeds, effectively addresses the high viscosity problem of starch gelatinization by using an anchor paddle to prevent material residue and localized overheating, a turbine-type dispersing paddle to break up nano-SiO2 agglomerates, and a spiral guide paddle to promote material circulation. The heat medium and cold medium circulation systems, through heating and cooling the stirred material with heat and cold media, enable temperature control, ensuring simultaneous and uniform water glass preparation and starch gelatinization, thus guaranteeing the adhesive's water resistance and bonding strength.

[0005] In one embodiment, the anchor-type stirring paddle is provided with a first drive shaft, the turbine-type dispersing paddle is provided with a second drive shaft, and the spiral-type guide paddle is provided with a third drive shaft. The second drive shaft is sleeved on the first drive shaft, and the third drive shaft is sleeved on the second drive shaft, so that the anchor-type stirring paddle, the turbine-type dispersing paddle, and the spiral-type guide paddle rotate coaxially. The first drive shaft, the second drive shaft, and the third drive shaft are connected to the output shaft of the drive motor through a reducer. The reducer and / or the drive motor are fixedly connected to the barrel lid.

[0006] In one embodiment, the blades of the turbine-type dispersion propeller are inclined at 45 degrees.

[0007] In one embodiment, the trailing edge of the turbine-type dispersion propeller blades is provided with several serrated structures.

[0008] In one embodiment, a guide tube is fitted around the outside of the helical guide propeller, and the diameter of the guide tube is 1 / 4 to 1 / 3 of the diameter of the inner barrel.

[0009] In one embodiment, a first driven gear is disposed at the end of the first drive shaft away from the anchor-type agitator, a second driven gear is disposed at the end of the second drive shaft away from the turbine-type dispersing impeller, and a third driven gear is disposed at the end of the third drive shaft away from the helical guide impeller; the reducer includes a base and a drive shaft, the base having a bearing seat hole, a first cylindrical hole, a second cylindrical hole, and a third cylindrical hole connected in sequence; the bearing seat hole is used to insert the first drive shaft and forms a bearing connection with the first drive shaft; the first cylindrical hole is used to insert the first driven gear, the second cylindrical hole is used to insert the second driven gear, and the third cylindrical hole is used to insert the third driven gear; the diameter of the first driven gear is smaller than that of the second driven gear. The diameter of the driven gear is smaller than that of the second driven gear than that of the third driven gear. The drive shaft is rotatably connected to the base via a bearing, and a first drive gear, a second drive gear, and a third drive gear are arranged sequentially from top to bottom. The second drive gear is used to mesh with the second driven gear for transmission, and the third drive gear is used to mesh with the third driven gear for transmission. The reducer also includes a transmission gear rotatably connected to the base. The transmission gear is disposed between the first cylindrical hole and the first drive gear and meshes with the first drive gear. The transmission gear is used to mesh with the first driven gear so that the rotation direction of the first transmission shaft is the same as that of the drive shaft and opposite to that of the third and second transmission shafts. In this embodiment, the bearing seat hole also serves to position the first transmission shaft.

[0010] In one embodiment, the first drive shaft is connected to the bearing housing bore via a sliding bearing.

[0011] In one embodiment, the diameters of the bearing housing bore, the first cylindrical bore, the second cylindrical bore, and the third cylindrical bore increase progressively.

[0012] In one embodiment, the diameter of the second drive gear is larger than the diameter of the first drive gear; the diameter of the first drive gear is larger than the diameter of the third drive gear.

[0013] In one embodiment, the first drive shaft and the second drive shaft are slidably connected or clearance-fitted; the second drive shaft and the third drive shaft are slidably connected or clearance-fitted.

[0014] In one embodiment, a first flange is provided at the upper end of the barrel body, and a second flange is provided at the lower end of the barrel lid; the first flange and the second flange cooperate with each other and are fixedly connected by a bolt assembly to achieve a fixed connection between the barrel body and the barrel lid.

[0015] In one embodiment, a sealing ring is also included. The sealing ring is made of a high-temperature resistant material and is disposed between the first flange and the second flange to seal and fix the barrel body to the barrel lid.

[0016] In one embodiment, a positioning post is provided on the edge of the first flange or the side of the barrel body, and a positioning sleeve is provided on the edge of the second flange or the side of the barrel cover. The positioning post can be inserted into the positioning sleeve and slidably connected or clearance-fitted with the positioning sleeve to position the first flange and the second flange, so as to facilitate subsequent fixing with bolt assemblies.

[0017] In one embodiment, there are at least two pairs of positioning posts and positioning sleeves, and they are evenly arranged in the circumferential direction.

[0018] In one embodiment, the first flange is fixedly connected to or integrally formed with the inner barrel body.

[0019] In one embodiment, a support foot is provided at the lower end of the barrel body. The support foot is used to stabilize the position of the barrel body and raise the discharge port to facilitate the external connection of the discharge port to the discharge pipe.

[0020] In one embodiment, the support leg is fixedly connected to or integrally formed with the outer barrel body.

[0021] In one embodiment, the bucket lid is also provided with a pressure detection port for detecting the pressure in the sealed stirring space.

[0022] In one embodiment, a pressure sensor is encapsulated within the pressure detection port.

[0023] In one embodiment, the bucket lid is also provided with a pressure relief valve to limit the maximum pressure within the stirring space.

[0024] In one embodiment, the pressure relief valve has a set opening pressure of 0.6 MPa.

[0025] In one embodiment, the bucket lid is also provided with a motor mounting bracket for fixing and installing the drive motor.

[0026] In one embodiment, the reducer is disposed on the lower side of the bucket lid, and the drive motor is disposed on the upper side of the bucket lid; the bucket lid is provided with a shaft hole for inserting the output shaft of the drive motor or the input end of the drive shaft of the reducer. The shaft hole is mechanically sealed to the output shaft of the drive motor or the drive shaft of the reducer.

[0027] In one embodiment, the reducer and the drive motor are disposed on the upper side of the bucket lid, and the bucket lid is provided with a shaft hole for inserting the third drive shaft; the shaft hole is mechanically sealed to the third drive shaft.

[0028] In one embodiment, the reducer and the drive motor are disposed on the lower side of the bucket lid to further improve the sealing of the stirring space between the bucket body and the bucket lid.

[0029] In one embodiment, the bucket lid is further provided with an observation window, which includes an observation hole on the bucket lid and an observation mirror encapsulated in the observation hole.

[0030] In one embodiment, the observation mirror is made of a transparent material.

[0031] In one embodiment, the observation hole is a circular hole, the observation mirror is a glass disk, and the diameter of the observation mirror is less than or equal to the diameter of the observation hole; the observation mirror is sealed and fixedly connected to the observation hole.

[0032] In one embodiment, the reducer is provided with a third flange for securing the reducer to the bucket lid via a bolt assembly.

[0033] In one embodiment, the reducer further includes a first bearing and a second bearing, one end of the drive shaft is rotatably connected to the base via the first bearing, and the other end is rotatably connected to the base via the second bearing.

[0034] In one embodiment, the first bearing and / or the second bearing is a ball bearing, a roller bearing, or a sliding bearing.

[0035] In one embodiment, the substrate is further provided with a cavity for mounting a drive gear, the cavity being in communication with the first cylindrical hole, the second cylindrical hole and the third cylindrical hole.

[0036] In one embodiment, a first retaining ring is provided at one end of the first drive shaft and a second retaining ring is provided at the other end. The first retaining ring is used to limit the depth of the first drive shaft inserted into the bearing seat hole, and the second retaining ring is used to prevent the second drive shaft from sliding downward along the first drive shaft. A third retaining ring is provided at one end of the second drive shaft and a fourth retaining ring is provided at the other end. The third retaining ring is used to limit the depth of the second drive shaft inserted into the first cylindrical hole, and the fourth retaining ring is used to prevent the third drive shaft from sliding downward along the second drive shaft. A fifth retaining ring is provided on the third drive shaft above the third driven gear, and the fifth retaining ring is used to limit the depth of the third drive shaft inserted into the second cylindrical hole.

[0037] In one embodiment, the first drive shaft has a first slot for engaging the first retaining ring; the second drive shaft has a second slot for engaging the third retaining ring; and the third drive shaft has a third slot for engaging the fifth retaining ring.

[0038] In one embodiment, the second retaining ring is fixedly connected to the first drive shaft and is sealed and slidably connected to the second drive shaft; the fourth retaining ring is fixedly connected to the second drive shaft and is sealed and slidably connected to the third drive shaft.

[0039] In one embodiment, the connection between the first drive shaft and the reducer employs a double-end mechanical seal structure, with the moving ring made of silicon carbide and the stationary ring made of graphite, fitted with a PTFE sealing ring. Similar sealing mechanisms can also be used between the second and third drive shafts and the reducer.

[0040] In one embodiment, the anchor-type stirring impeller rotates at a speed of 20-50 r / min; the turbine-type dispersing impeller rotates at a speed of 150-300 r / min; and the spiral-type guide impeller rotates at a speed of 80-120 r / min.

[0041] In one embodiment, the anchor-type stirring impeller rotates at a speed of 35-40 r / min; the turbine-type dispersing impeller rotates at a speed of 200-250 r / min; and the spiral-type guide impeller rotates at a speed of 100-110 r / min.

[0042] In one embodiment, the barrel includes an inner barrel and an outer barrel fitted onto the inner barrel, with the inner barrel and the outer barrel spaced apart; the barrel lid is detachably and sealingly connected to the inner barrel and / or the outer barrel, and the inner barrel and the barrel lid enclose the stirring space; a supporting partition is provided between the inner barrel and the outer barrel to restrict the position of the inner barrel within the outer barrel, and / or to divide the space between the inner barrel and the outer barrel into several functional cavities or functional areas; the supporting partition is fixedly connected to the inner barrel and / or the outer barrel.

[0043] In one embodiment, the heat transfer system heats the material being stirred by heating the inner tank, and the refrigerant circulation system cools the material being stirred by cooling the inner tank; the inner tank is made of a good conductor of heat, such as stainless steel.

[0044] In one embodiment, the heat medium circulation system includes a heat coil and a heat medium inlet pipe joint and a heat medium outlet pipe joint disposed on the outer wall of the outer barrel. One end of the heat coil is connected to the heat medium inlet pipe joint, and the other end is connected to the heat medium outlet pipe joint. The refrigerant circulation system includes a cold coil and a refrigerant inlet pipe joint and a refrigerant outlet pipe joint disposed on the outer wall of the outer barrel. One end of the cold coil is connected to the refrigerant inlet pipe joint, and the other end is connected to the refrigerant outlet pipe joint. The heat coil and the cold coil are arranged side by side and are wrapped around the bottom surface and / or outer wall of the inner barrel, so that the heat coil and the cold coil are generally arranged alternately, so that the heating and cooling coverage areas are approximately the same.

[0045] In one embodiment, the hot coil and the cold coil are made of copper tubing.

[0046] In one embodiment, the heating medium is oil and the cooling medium is water.

[0047] In one embodiment, a heat insulation layer is provided between the inner wall of the outer barrel and the hot coil and the cold coil.

[0048] In one embodiment, a first temperature sensor and a second temperature sensor are also included. The temperature detection ends of the first temperature sensor and the second temperature sensor are fixed inside the barrel to detect the temperature of the material being stirred inside the mixing barrel. The installation position of the first temperature sensor is higher than the installation position of the second temperature sensor, so that the first temperature sensor detects the temperature of the upper part of the material being stirred, and the second temperature sensor detects the temperature of the lower part of the material being stirred.

[0049] In one embodiment, the detection heads of the first and second temperature sensors are respectively located at the lower part of the mixing tank, such as near the anchor-type agitator, and at the upper part, such as near the lower middle part of the spiral guide impeller. This arrangement allows for simultaneous acquisition of temperatures in different areas within the tank. The PLC system calculates the temperature difference, and when the temperature difference exceeds 3°C, it automatically adjusts the stirring speed or the temperature control system (heat medium circulation system + coolant circulation system) to further ensure reaction uniformity.

[0050] In one embodiment, the first temperature sensor and the second temperature sensor are PT100 platinum resistance sensors.

[0051] In one embodiment, a third temperature sensor is also included; the third temperature sensor is disposed against the inner tub and is used to detect the wall temperature of the inner tub; the third temperature sensor is installed at the bottom of the inner tub.

[0052] The high-pressure temperature-controlled mixing tank for nano-SiO2 starch-based composite adhesives provided above features a three-layer coaxial mixing structure. Through the combination of different impeller types and rotation speeds, the anchor impeller avoids material residue and localized overheating, the turbine-type dispersing impeller breaks up nano-SiO2 agglomerates, and the spiral guide impeller promotes material circulation, effectively solving the problem of high viscosity during starch gelatinization. The hot and cold medium circulation systems heat and cool the stirred material through the hot and cold mediums, enabling temperature control of the stirred material and ensuring that water glass preparation and starch gelatinization proceed synchronously and uniformly, thus guaranteeing the adhesive's water resistance and bonding strength. Attached Figure Description

[0053] Figure 1 A schematic diagram of the mixing tank assembly structure and a partial cross-sectional structure provided for one or more embodiments; Figure 2 A schematic diagram of the assembly structure of a stirring paddle assembly provided for one or more embodiments; Figure 3 A schematic cross-sectional structure diagram of a speed reducer provided for one or more embodiments; Figure 4 A cross-sectional structural schematic diagram of a reducer and agitator assembly provided for one or more embodiments.

[0054] Explanation of reference numerals in the attached figures:

[0055] 100. Barrel body; 110. Inner barrel body; 120. Outer barrel body; 121. Support leg; 122. Discharge port; 123. First flange; 124. Positioning post; 125. Support partition; 200. Barrel lid; 210. Raw material inlet; 220. Nano-SiO2 replenishment port; 230. Pressure detection port; 240. Pressure relief valve; 250. Motor mounting base; 260. Positioning sleeve; 270. Observation window; 280 300. Second flange; 310. Agitator assembly; 311. Anchor-type agitator; 312. First drive shaft; 313. First driven gear; 314. First retaining ring; 315. First retaining groove; 320. Turbine-type dispersing impeller; 321. Second drive shaft; 322. Second driven gear; 323. Third retaining ring; 324. Second retaining groove; 325. Fourth retaining ring; 330. Spiral guide impeller; 33 1. Third drive shaft; 332. Third driven gear; 333. Fifth retaining ring; 334. Third slot; 400. Reducer; 410. Base; 411. Bearing seat hole; 412. First cylindrical hole; 413. Second cylindrical hole; 414. Third cylindrical hole; 420. Drive shaft; 431. First bearing; 432. Second bearing; 441. First drive gear; 442. Transmission gear; 443. Second drive gear; 444. Third drive gear; 450. Third flange; 500. Drive motor; 610. Heating coil; 611. Heating medium inlet pipe joint; 612. Heating medium outlet pipe joint; 620. Cooling coil; 621. Refrigerant inlet pipe joint; 622. Refrigerant outlet pipe joint; 710. First temperature sensor; 720. Second temperature sensor; 730. Third temperature sensor; 800. Sealing ring; 810. Bolt assembly. Detailed Implementation

[0056] In this patent document, the following is discussed Figure 1-4 The various embodiments used to describe the principles or methods of this disclosure are for illustrative purposes only and should not be construed as limiting the scope of this disclosure in any way. Preferred embodiments of this disclosure will be described below with reference to the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations will be omitted to avoid obscuring the subject matter of this disclosure with unnecessary detail. Furthermore, the terminology used herein will be defined according to the functional definition of this utility model. Therefore, the terminology may vary depending on the intention or usage of the user or operator. Consequently, the terminology used herein must be understood based on the descriptions made herein.

[0057] A high-pressure temperature-controlled stirring tank for nano-SiO2 starch-based composite adhesives, such as Figure 1As shown, the device includes a barrel body 100, a barrel cover 200, and a stirring paddle assembly 300. The barrel cover 200 is detachably and sealingly connected to the barrel body 100, and the barrel body 100 and the barrel cover 200 enclose the stirring space of the mixing barrel. The barrel cover 200 is provided with a raw material inlet 210 and a nano-SiO2 replenishment inlet 220 communicating with the stirring space. The bottom of the barrel body 100 is provided with a discharge outlet 122 communicating with the stirring space. The stirring paddle assembly 300 includes an anchor-type stirring paddle 310, a turbine-type dispersing paddle 320, and a spiral guide paddle 330 arranged sequentially from bottom to top. Anchor-type stirring paddle 310 is fitted to the bottom and wall of the tank 100. Spiral-type guide paddle 330 is vertically positioned to provide vertical flow guidance. Turbine-type dispersing paddle 320 generates radial shear force and / or turbulence during rotation, breaking up agglomerates of nano-SiO2 and dispersing them uniformly in the starch paste matrix. The tank also includes a heat medium circulation system and a cold medium circulation system. The heat medium circulation system heats the stirred material using a heat medium, and the cold medium circulation system cools the stirred material using a cold medium. Both the heat medium and the cold medium are heat-carrying fluids. In this embodiment, the raw material inlet 210 is the core feeding channel of the stirring tank, mainly used to add the basic reaction raw materials for the preparation of the nano-SiO2 / starch-based composite adhesive, specifically including: Liquid alkali (10wt%-18wt% liquid sodium hydroxide): reacts with quartz sand as a reactant in the formation of water glass, and is also a key gelatinizing agent for starch gelatinization. It ionizes to release OH⁻, which breaks the hydrogen bonds of water molecules and promotes the swelling of starch granules by absorbing water. Quartz sand: used to react with liquid alkali to produce sodium silicate water glass (core reaction: SiO2 + 2NaOH → Na2SiO3 + H2O), which is an indirect source of nano-SiO2 in composite adhesives; Starch aqueous solution: The core substrate can be corn starch, potato starch, etc. After gelatinization, it is combined with water glass and nano SiO2 to form the main body of the adhesive. The concentration of starch aqueous solution is selected as 15%-27%.

[0058] The three raw materials mentioned above are added simultaneously or sequentially according to a set ratio, such as liquid alkali and quartz sand in a mass ratio of 1:1 to 1:5, and starch aqueous solution accounting for 40% to 60% of the liquid alkali mass. This provides a reaction basis for the simultaneous boiling of water glass and gelatinization of starch. Therefore, centralized feeding through the same raw material inlet 210 simplifies the feeding process. Of course, multiple raw materials can also be transported simultaneously through pipeline branches.

[0059] Based on the process principles and equipment functional requirements of the patent (CN107099263B), this application has designed a unique nano-SiO2 addition port 220 to adapt to the reaction sequence, ensure mixing effect, and avoid process failure. Specifically: 1. Match the reaction sequence of the stirred materials to avoid premature reaction interference. First, the water glass boiling and starch gelatinization need to be stirred and reacted under high pressure and 100-140℃ for 80-120 minutes before adding nano-SiO2. If SiO2 is added together with liquid alkali, quartz sand, and starch aqueous solution through the raw material inlet 210, it will cause the nano-SiO2 to react prematurely with the incompletely gelatinized starch particles and the undercooked water glass, disrupting the synchronicity of starch gelatinization and water glass hydrolysis and condensation. Second, the starch must be fully gelatinized and the water glass fully hydrolyzed and condensed before adding SiO2 for coating. Adding SiO2 together can easily lead to the failure of the anti-agglomeration and viscosity reduction effects.

[0060] 2. Precise control of SiO2 replenishment ensures accurate proportioning. The SiO2 replenishment amount is typically 16%-24% of the liquid caustic soda mass, and the replenishment timing must be precisely triggered after 80-120 minutes of simultaneous reaction. A separately designed replenishment port can be equipped with a pneumatic valve and a high-precision flow meter, and can be linked to the reaction time and liquid caustic soda feed rate via a PLC system to achieve quantitative and timed automatic replenishment. If the feed port is shared with other raw materials, SiO2 metering errors can easily occur due to feed impact and material mixing, deviating from the patented proportioning requirements.

[0061] 3. Avoid agglomeration and feed blockage of nano-SiO2. Nano-SiO2 is in powder form, with a large specific surface area, making it prone to agglomeration. Its density also differs significantly from that of liquid alkali and starch aqueous solution. The separately designed replenishment port is located in the upper part of the mixing tank. During replenishment, the axial circulation generated by the guide paddle can directly carry SiO2 into the material mixing zone. Combined with the shearing force of the middle turbine dispersion paddle 320, potential agglomerates can be quickly dispersed. If it is added from the raw material inlet 210 mixed with other raw materials, SiO2 is prone to floating on the liquid surface or settling at the bottom of the tank, forming agglomerates that are difficult to disperse. At the same time, it may cause blockage of the feed inlet due to mixing with quartz sand (solid particles) and starch aqueous solution (viscous liquid).

[0062] 4. Ensuring the stability of the reaction system. During the simultaneous reaction stage of water glass boiling and starch gelatinization, the tank is under high pressure (0.3-0.5 MPa) and high temperature (100-140℃). The raw material inlet 210 must be kept sealed after feeding to maintain the high-pressure environment. The separately designed nano-SiO2 replenishment port 220 uses a high-pressure sealed pneumatic valve, which is only opened briefly during replenishment and immediately sealed after replenishment. This avoids pressure leakage and temperature fluctuations inside the tank due to frequent opening of the raw material inlet 210, thus ensuring the stability of the simultaneous reaction.

[0063] The innovative three-layer stirring paddle assembly 300 of this application can form a closed loop of "circulation-shearing-cleaning" through the synergistic effect of different paddle types, achieving the core objectives of "anti-agglomeration, uniform mixing, and viscosity reduction," ultimately realizing the uniform mixing and stable performance of the composite adhesive. Specifically: The main functions of the anchor-type agitator 310 located at the bottom are: Material scraping: The anchor-type stirring paddle 310 is designed to fit the bottom and wall of the barrel, which can scrape off viscous materials such as gelatinized starch and water glass that are attached to the inner wall of the equipment. This avoids the problem of overheating and carbonization or incomplete reaction caused by long-term retention of local materials, and especially solves the problem of uneven boiling of water glass.

[0064] Assisted mixing: When the anchor-type stirring paddle 310 rotates at low speed, it can push the material at the bottom of the barrel to flow upward, forming a basic axial circulation, which provides a stable material supply to the turbine-type dispersing paddle 320 located in the middle layer.

[0065] Uniform heat transfer: The anchor-type stirring paddle 310 breaks the boundary layer between the barrel wall and the material, promoting heat transfer between the heat medium circulation system and the cold medium circulation system, and avoiding uneven starch gelatinization caused by excessive local temperature difference.

[0066] The main functions of the turbine-type dispersion propeller 320 located in the middle layer are: Dispersion function: When the turbine-type dispersing paddle 320 rotates, it will generate strong radial shear force and turbulence effect, which can completely break up the agglomerates of nano-SiO2 and make them uniformly dispersed in the starch paste matrix, thus meeting the requirement of coating nano-SiO2 with gelatinized starch.

[0067] Reducing system viscosity: The high-intensity shearing action generated by the turbine dispersion paddle at 320° rotation can break the hydrogen bonds between starch molecules, reduce the frictional resistance within the material, and directly reduce the viscosity of the adhesive system. When the viscosity exceeds the standard, the viscosity reduction effect can be enhanced by increasing the rotation speed.

[0068] Promotes component fusion: The turbulence generated by the turbine dispersion paddle 320 shear can accelerate the molecular-level mixing of starch paste, water glass and nano SiO2, avoiding the problem of excessively high local component concentration.

[0069] The main functions of the upper-level helical guide vane 330 are: Constructing a circulating flow field: When the spiral guide paddle 330 rotates, it will generate a strong axial downward suction force, pushing the material in the upper part of the barrel 100 downward to the middle layer of the turbine dispersion paddle 320 area, and then flowing back upward through the anchor stirring paddle 310 at the bottom layer, forming a full-domain material circulation in the upper, middle and lower areas.

[0070] Solving the stratification problem: The ingenious design and application of the spiral guide paddle 330 can avoid the stratification defects of insufficient gelatinization of the upper layer material and overcooking of the lower layer material in traditional stirring, ensuring that the reaction progress of the material in the entire tank is consistent.

[0071] Optimized dispersion efficiency: A stable circulating flow field allows nano-SiO2 particles to pass through the shear zone of the middle dispersion paddle multiple times, further improving dispersion uniformity and preventing secondary agglomeration.

[0072] This configuration, with its three-layer coaxial stirring structure, utilizes different impeller types and rotation speeds. The anchor impeller prevents material residue and localized overheating, the turbine-type dispersing impeller 320 breaks up nano-SiO2 agglomerates, and the spiral guide impeller 330 promotes material circulation, effectively solving the problem of high viscosity during starch gelatinization. The hot and cold medium circulation systems heat and cool the stirred material using the hot and cold mediums, enabling temperature control and ensuring that water glass preparation and starch gelatinization proceed simultaneously and uniformly, thus guaranteeing the adhesive's water resistance and bonding strength.

[0073] In one embodiment, the blades of the anchor-type stirring paddle 310, the turbine-type dispersing paddle 320, and the spiral guide paddle 330 are all made of Hastelloy C276, which is resistant to strong alkali corrosion and suitable for the NaOH environment in the adhesive system.

[0074] In one embodiment, such as Figure 1 As shown, the nano-SiO2 replenishment port 220 is located on the upper part of the barrel cover 200, equipped with a pneumatic valve and a flow meter, which can replenish SiO2 after the reaction in the barrel for 80-120 minutes, with the replenishment accuracy controlled within ±0.5%.

[0075] In one embodiment, an online viscosity monitor (not shown in the figure) is also included. The online viscosity monitor uses a rotary viscosity sensor (measurement range 10-1000 Pa·s) to display the viscosity of the system in real time. When the viscosity exceeds the set value, the viscosity can be reduced by increasing the rotation speed of the turbine dispersion paddle 320.

[0076] In one embodiment, the effective volume of the barrel 100 is 500-2000L.

[0077] In one embodiment, the stirring pressure is 0.3-0.5 MPa.

[0078] In one embodiment, the stirring temperature range is selected from room temperature to 160°C to cover the reaction temperature range of the nano-SiO2 / starch-based composite adhesive of this application, and a safety margin of 10-20°C is reserved.

[0079] In one embodiment, the barrel 100 is made of 316L stainless steel, which is resistant to liquid alkali corrosion, and is also resistant to high temperatures and easy to clean.

[0080] In one embodiment, the inner wall of the barrel 100 is mirror polished with a roughness Ra≤0.8μm to reduce the adhesion of starch paste and nano-SiO2 and avoid residual pollution.

[0081] In one embodiment, such as Figure 1 Figure 2 As shown, the anchor-type stirring paddle 310 is provided with a first drive shaft 311, the turbine-type dispersing paddle 320 is provided with a second drive shaft 321, and the helical guide paddle 330 is provided with a third drive shaft 331. The second drive shaft 321 is sleeved onto the first drive shaft 311, and the third drive shaft 331 is sleeved onto the second drive shaft 321, so that the anchor-type stirring paddle 310, the turbine-type dispersing paddle 320, and the helical guide paddle 330 rotate coaxially. The first drive shaft 311, the second drive shaft 321, and the third drive shaft 331 are connected to the output shaft of the drive motor 500 through a reducer 400. The reducer 400 and / or the drive motor 500 are fixedly connected to the bucket cover 200. In this embodiment, coaxial rotation means that the anchor-type stirring paddle 310, the turbine-type dispersing paddle 320, and the helical guide paddle 330 rotate around the same axis of rotation.

[0082] In one embodiment, such as Figure 1 Figure 2 As shown, the blades of the turbine-type dispersion propeller 320 are set at a 45-degree angle.

[0083] In one embodiment, the trailing edge of the turbine-type dispersion propeller 320 is provided with several serrated structures (not shown in the figure). In this embodiment, the serration density of the trailing edge of the propeller is 3 teeth / cm.

[0084] In one embodiment, such as Figure 1 Figure 2 As shown, the helical guide vane 330 is an axial guide with a helical lift angle of 15±1°.

[0085] In one embodiment, a guide tube (not shown in the figure) is fitted around the outer side of the spiral guide impeller 330, and the diameter of the guide tube is 1 / 4 to 1 / 3 of the diameter of the inner barrel 110. This arrangement allows the material to be stirred to circulate between the two ends of the guide tube and further improves the guiding effect.

[0086] In one embodiment, the gap between the helical guide vane 330 and the inner wall of the guide tube is 10±0.5mm.

[0087] In one embodiment, such as Figure 1 Figure 2 As shown, a first driven gear 312 is provided at the end of the first drive shaft 311 away from the anchor-type agitator 310; a second driven gear 322 is provided at the end of the second drive shaft 321 away from the turbine-type dispersing impeller 320; and a third driven gear 332 is provided at the end of the third drive shaft 331 away from the helical guide impeller 330. Figure 3 Figure 4As shown, the reducer 400 includes a base 410 and a drive shaft 420. The base 410 is provided with a bearing seat hole 411, a first cylindrical hole 412, a second cylindrical hole 413, and a third cylindrical hole 414 connected in sequence. The bearing seat hole 411 is used to insert the first drive shaft 311 and forms a bearing connection with the first drive shaft 311. The first cylindrical hole 412 is used to insert the first driven gear 312, the second cylindrical hole 413 is used to insert the second driven gear 322, and the third cylindrical hole 414 is used to insert the third driven gear 332. The diameter of the first driven gear 312 is smaller than the diameter of the second driven gear 322, and the diameter of the second driven gear 322 is smaller than the diameter of the third driven gear 332. The drive shaft 420 is connected to the base 410 via a shaft. The reducer 400 is rotatably connected to the base 410 and is provided with a first drive gear 441, a second drive gear 443, and a third drive gear 444 in sequence from top to bottom. The second drive gear 443 is used to mesh with the second driven gear 322 for transmission, and the third drive gear 444 is used to mesh with the third driven gear 332 for transmission. The reducer 400 also includes a transmission gear 442 rotatably connected to the base 410. The transmission gear 442 is disposed between the first cylindrical hole 412 and the first drive gear 441 and meshes with the first drive gear 441. The transmission gear 442 is used to mesh with the first driven gear 312 so that the rotation direction of the first transmission shaft 311 is the same as that of the drive shaft 420, and opposite to that of the third transmission shaft 331 and the second transmission shaft 321. In this embodiment, the bearing seat hole 411 also serves to position the first transmission shaft 311. This configuration not only enables the stirring components to achieve stable transmission, but also allows the turbine-type dispersing paddle 320 in the middle layer to rotate in the opposite direction to the anchor-type stirring paddle 310 at the bottom, which can further enhance the shearing and dispersing effect of the turbine-type dispersing paddle 320.

[0088] In one embodiment, the driven gear and the driving gear can be replaced by a transmission mechanism with pulleys and belts.

[0089] In one embodiment, such as Figure 4 As shown, the first drive shaft 311 is connected to the bearing housing hole 411 via a sliding bearing.

[0090] In one embodiment, such as Figure 3 Figure 4 As shown, the diameters of the bearing housing bore 411, the first cylindrical bore 412, the second cylindrical bore 413, and the third cylindrical bore 414 increase progressively. In this embodiment, the bearing housing bore 411, the first cylindrical bore 412, the second cylindrical bore 413, and the third cylindrical bore 414 are preferably circular holes. This arrangement gives the bearing housing bore 411, the first cylindrical bore 412, the second cylindrical bore 413, and the third cylindrical bore 414 an overall stepped or tower-like shape, to accommodate drive shafts and / or driven gears of different diameters.

[0091] In one embodiment, such as Figure 3 Figure 4 As shown, the diameter of the second drive gear 443 is larger than the diameter of the first drive gear 441; the diameter of the first drive gear 441 is larger than the diameter of the third drive gear 444. This configuration allows the turbine-type dispersing impeller 320 to achieve a higher rotational speed than the anchor-type stirring impeller 310, thus matching the roles played by each impeller type in this application.

[0092] In one embodiment, such as Figure 1 Figure 2 As shown, the first drive shaft 311 and the second drive shaft 321 are slidably connected or have a clearance fit; the second drive shaft 321 and the third drive shaft 331 are slidably connected or have a clearance fit.

[0093] In one embodiment, such as Figure 2 As shown, a first flange 123 is provided at the upper end of the barrel body 100, and a second flange 280 is provided at the lower end of the barrel cover 200. The first flange 123 and the second flange 280 cooperate with each other and are fixedly connected by a bolt assembly 810 to achieve a fixed connection between the barrel body 100 and the barrel cover 200. In this embodiment, since the inside of the barrel body 100 is under high pressure during operation, the connection using flanges and bolt assembly 810 is more stable and reliable.

[0094] In one embodiment, such as Figure 1 As shown, it also includes a sealing ring 800, which is made of a high-temperature resistant material and is disposed between the first flange 123 and the second flange 280 to seal and fix the barrel body 100 and the barrel cover 200. In this embodiment, since the inside of the barrel body 100 is under high pressure during operation, the sealing ring 800 between the flanges can make the sealing effect more stable and reliable.

[0095] In one embodiment, such as Figure 1 As shown, a positioning post 124 is provided on the edge of the first flange 123 or the side of the barrel 100, and a positioning sleeve 260 is provided on the edge of the second flange 280 or the side of the barrel cover 200. The positioning post 124 can be inserted into the positioning sleeve 260 and slide or gap-fit ​​with the positioning sleeve 260 to position the first flange 123 and the second flange 280, so as to facilitate subsequent fixing with bolt assembly 810.

[0096] In one embodiment, such as Figure 1 As shown, there are at least two pairs of positioning pins 124 and positioning sleeves 260, and they are evenly arranged in the circumferential direction.

[0097] In one embodiment, such as Figure 1 As shown, the first flange 123 is fixedly connected to the inner barrel 110 or integrally formed.

[0098] In one embodiment, such as Figure 1 As shown, a support foot 121 is provided at the lower end of the barrel 100. The support foot 121 is used to stabilize the position of the barrel 100 and raise the discharge port 122 to facilitate the external connection of the discharge port 122 to the discharge pipe.

[0099] In one embodiment, such as Figure 1 As shown, the support foot 121 is fixedly connected to the outer barrel body 120 or integrally formed.

[0100] In one embodiment, such as Figure 1 As shown, the lid 200 is also equipped with a pressure detection port 230 for detecting the pressure in the sealed stirring space.

[0101] In one embodiment, a pressure sensor is encapsulated within the pressure detection port 230.

[0102] In one embodiment, the pressure detection port 230 is used to connect a pressure gauge, thereby connecting the pressure gauge to the stirring space. In this embodiment, the interface diameter of the pressure gauge is preferably Φ15mm.

[0103] In one embodiment, such as Figure 1 As shown, a pressure relief valve 240 is also provided on the bucket lid 200 to limit the maximum pressure in the stirring space.

[0104] In one embodiment, the pressure relief valve 240 has a starting pressure of 0.6 MPa.

[0105] In one embodiment, such as Figure 1 As shown, the bucket lid 200 is also provided with a motor mounting base 250 for fixing and mounting the drive motor 500.

[0106] In one embodiment, such as Figure 1 As shown, the reducer 400 is located on the lower side of the bucket cover 200, and the drive motor 500 is located on the upper side of the bucket cover 200. The bucket cover 200 is provided with a shaft hole for inserting the output shaft of the drive motor 500 or the input end of the drive shaft 420 of the reducer 400. The shaft hole is mechanically sealed to the output shaft of the drive motor 500 or the drive shaft 420 of the reducer 400.

[0107] In one embodiment, the reducer 400 and the drive motor 500 are disposed on the upper side of the barrel cover 200, and the barrel cover 200 is provided with a shaft hole for inserting a third drive shaft 331; the shaft hole is mechanically sealed to the third drive shaft 331.

[0108] In one embodiment, the reducer 400 and the drive motor 500 are disposed on the lower side of the lid 200 to further improve the sealing of the stirring space between the barrel 100 and the lid 200.

[0109] In one embodiment, such as Figure 1 As shown, the bucket lid 200 is also provided with an observation window 270, which includes an observation hole provided on the bucket lid 200 and an observation mirror encapsulated in the observation hole.

[0110] In one embodiment, such as Figure 1 As shown, the observation mirror is made of transparent material.

[0111] In one embodiment, such as Figure 1 As shown, the observation hole is a circular hole, and the observation mirror is a glass disk, with the diameter of the observation mirror being less than or equal to the diameter of the observation hole; the observation mirror and the observation hole are sealed and fixedly connected.

[0112] In one embodiment, such as Figure 3 Figure 4 As shown, the reducer 400 is provided with a third flange 450, which is used to fix the reducer 400 to the barrel cover 200 by means of bolt assembly 810.

[0113] In one embodiment, such as Figure 3 Figure 4 As shown, the reducer 400 also includes a first bearing 431 and a second bearing 432. One end of the drive shaft 420 is rotatably connected to the base 410 through the first bearing 431, and the other end is rotatably connected to the base 410 through the second bearing 432.

[0114] In one embodiment, such as Figure 3 Figure 4 As shown, the first bearing 431 and / or the second bearing 432 are a type of ball bearing, roller bearing, or sliding bearing.

[0115] In one embodiment, such as Figure 3 Figure 4 As shown, the base 410 also has a cavity for mounting the drive gear, and the cavity communicates with the first cylindrical hole 412, the second cylindrical hole 413, and the third cylindrical hole 414. In this embodiment, the drive gear can be mounted in the same cavity or in three separate cavities. When mounted in three cavities, the three cavities are arranged vertically and horizontally. Furthermore, the transmission gear 442 is also disposed in the cavity.

[0116] In one embodiment, such as Figure 2As shown, a first retaining ring 313 is provided at one end of the first drive shaft 311, and a second retaining ring 315 is provided at the other end. The first retaining ring is used to limit the depth of the first drive shaft 311 inserted into the bearing seat hole 411, and the second retaining ring 315 is used to prevent the second drive shaft 321 from sliding downward along the first drive shaft 311. A third retaining ring 323 is provided at one end of the second drive shaft 321, and a fourth retaining ring 325 is provided at the other end. The third retaining ring is used to limit the depth of the second drive shaft 321 inserted into the first cylindrical hole 412, and the fourth retaining ring 325 is used to prevent the third drive shaft 331 from sliding downward along the second drive shaft 321. A fifth retaining ring 333 is provided on the third drive shaft 331 above the third driven gear 332. The fifth retaining ring 333 is used to limit the depth of the third drive shaft 331 inserted into the second cylindrical hole 413.

[0117] In one embodiment, such as Figure 2 Figure 4 As shown, the first drive shaft 311 has a first slot 314 for engaging the first retaining ring; the second drive shaft 321 has a second slot 324 for engaging the third retaining ring; and the third drive shaft 331 has a third slot 334 for engaging the fifth retaining ring 333. This arrangement facilitates the assembly and disassembly of the first drive shaft 311, the second drive shaft 321, and the third drive shaft 331, and the snap-fit ​​method is more convenient and faster. Furthermore, the retaining ring, after being snapped in, abuts against the stepped end of the cylinder bore in the reducer 400 and is constrained by the cylinder bore wall, ensuring reliable operation.

[0118] In one embodiment, such as Figure 2 Figure 4 As shown, the second retaining ring is fixedly connected to the first drive shaft 311 and is sealed and slidably connected to the second drive shaft 321; the fourth retaining ring is fixedly connected to the second drive shaft 321 and is sealed and slidably connected to the third drive shaft 331.

[0119] In one embodiment, the connection between the first drive shaft 311 and the reducer 400 employs a double-end mechanical seal structure, with the moving ring made of silicon carbide and the stationary ring made of graphite, fitted with a PTFE sealing ring. Similar sealing mechanisms can also be used between the second drive shaft 321 and the third drive shaft 331 and the reducer 400.

[0120] In one embodiment, the anchor-type stirring paddle 310 rotates at a speed of 20-50 r / min; the turbine-type dispersing paddle 320 rotates at a speed of 150-300 r / min; and the spiral-type guide paddle 330 rotates at a speed of 80-120 r / min.

[0121] In one embodiment, the anchor-type stirring paddle 310 rotates at a speed of 35-40 r / min; the turbine-type dispersing paddle 320 rotates at a speed of 200-250 r / min; and the spiral-type guide paddle 330 rotates at a speed of 100-110 r / min.

[0122] In one embodiment, such as Figure 1 As shown, the barrel 100 includes an inner barrel 110 and an outer barrel 120 fitted onto the inner barrel 110, with the inner barrel 110 and the outer barrel 120 spaced apart. The barrel lid 200 is detachably and sealingly connected to the inner barrel 110 and / or the outer barrel 120, and the inner barrel 110 and the barrel lid 200 enclose a stirring space. A supporting partition 125 is provided between the inner barrel 110 and the outer barrel 120 to restrict the position of the inner barrel 110 within the outer barrel 120, and / or to divide the space between the inner barrel 110 and the outer barrel 120 into several functional cavities or functional areas. The supporting partition 125 is fixedly connected to the inner barrel 110 and / or the outer barrel 120.

[0123] In one embodiment, the heat medium circulation system heats the stirred object by heating the inner barrel 110, and the cold medium circulation system cools the stirred object by cooling the inner barrel 110; the inner barrel 110 is made of a good conductor of heat, such as stainless steel.

[0124] In one embodiment, such as Figure 1 As shown, the heat medium circulation system includes a heat coil 610 and a heat medium inlet pipe joint 611 and a heat medium outlet pipe joint 612 disposed on the outer wall of the outer barrel 120. One end of the heat coil 610 is connected to the heat medium inlet pipe joint 611, and the other end is connected to the heat medium outlet pipe joint 612. The refrigerant circulation system includes a cold coil 620 and a refrigerant inlet pipe joint 621 and a refrigerant outlet pipe joint 622 disposed on the outer wall of the outer barrel 120. One end of the cold coil 620 is connected to the refrigerant inlet pipe joint 621, and the other end is connected to the refrigerant outlet pipe joint 622. The heat coil 610 and the cold coil 620 are arranged side by side and are wrapped around the bottom surface and / or outer wall of the inner barrel 110 so that the heat coil 610 and the cold coil 620 are generally arranged alternately, so that the heating and cooling coverage areas are approximately the same.

[0125] In one embodiment, the hot coil 610 and the cold coil 620 are made of copper tubing.

[0126] In one embodiment, the heating medium is oil and the cooling medium is water.

[0127] In one embodiment, a heat insulation layer is provided between the inner wall of the outer barrel 120 and the hot coil 610 and the cold coil 620.

[0128] In one embodiment, such as Figure 1As shown, it also includes a first temperature sensor 710 and a second temperature sensor 720. The temperature detection ends of the first temperature sensor 710 and the second temperature sensor 720 are fixed inside the barrel 100 to detect the temperature of the material being stirred inside the mixing barrel. The installation position of the first temperature sensor 710 is higher than the installation position of the second temperature sensor 720, so that the first temperature sensor 710 detects the temperature of the upper part of the material being stirred, and the second temperature sensor 720 detects the temperature of the lower part of the material being stirred.

[0129] In one embodiment, such as Figure 1 As shown, the detection heads of the first temperature sensor 710 and the second temperature sensor 720 are located at the lower and upper parts of the mixing tank, respectively. The lower part is positioned close to the anchor-type stirring paddle 310, and the upper part is positioned close to the lower-middle part of the spiral guide paddle 330. This arrangement allows for simultaneous acquisition of temperatures in different areas within the tank. The PLC system calculates the temperature difference, and when the temperature difference exceeds 3°C, the stirring speed or the temperature control system (heat medium circulation system + cold medium circulation system) is automatically adjusted to further ensure reaction uniformity.

[0130] In one embodiment, the first temperature sensor 710 and the second temperature sensor 720 are PT100 platinum resistance sensors.

[0131] In one embodiment, such as Figure 1 As shown, it also includes a third temperature sensor 730; the third temperature sensor 730 is disposed against the inner barrel 110 and is used to detect the wall temperature of the inner barrel 110; the third temperature sensor 730 is installed at the bottom of the inner barrel 110.

[0132] The high-pressure temperature-controlled mixing tank for nano-SiO2 starch-based composite adhesives provided above features a three-layer coaxial mixing structure. Through the combination of different impeller types and rotation speeds, the anchor impeller avoids material residue and localized overheating, the turbine-type dispersing impeller 320 breaks up nano-SiO2 agglomerates, and the spiral guide impeller 330 promotes material circulation, effectively solving the problem of high viscosity during starch gelatinization. The hot and cold medium circulation systems heat and cool the stirred material through the hot and cold mediums, enabling temperature control of the stirred material and ensuring that water glass preparation and starch gelatinization proceed synchronously and uniformly, thus guaranteeing the adhesive's water resistance and bonding strength.

[0133] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives, characterized in that, Includes the barrel body, barrel lid, and stirring paddle assembly; The barrel lid is detachably and sealed to the barrel body. The barrel body and the barrel lid form the stirring space of the stirring barrel. The barrel lid is provided with a raw material inlet and a nano-SiO2 replenishment inlet that are connected to the stirring space. The bottom of the barrel body is provided with a discharge outlet that is connected to the stirring space. The stirring paddle assembly includes an anchor-type stirring paddle, a turbine-type dispersing paddle, and a spiral guide paddle arranged sequentially from bottom to top. The anchor-type stirring paddle is set to fit the bottom and wall of the barrel body. The spiral guide paddle is set vertically to generate a vertical guiding effect. The turbine-type dispersing paddle is used to generate radial shear force and / or turbulence effect when rotating to break up the agglomerates of nano-SiO2 and make them uniformly dispersed in the starch paste matrix. It also includes a heat medium circulation system and a cold medium circulation system. The heat medium circulation system is used to heat the stirred object through a heat medium, and the cold medium circulation system is used to cool the stirred object through a cold medium. The heat medium and the cold medium are heat-carrying fluids.

2. The high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives according to claim 1, characterized in that, The anchor-type stirring paddle is provided with a first drive shaft, the turbine-type dispersing paddle is provided with a second drive shaft, and the spiral-type guide paddle is provided with a third drive shaft. The second drive shaft is sleeved on the first drive shaft, and the third drive shaft is sleeved on the second drive shaft, so that the anchor-type stirring paddle, the turbine-type dispersing paddle, and the spiral-type guide paddle rotate coaxially. The first drive shaft, the second drive shaft, and the third drive shaft are connected to the output shaft of the drive motor via a reducer; The reducer and / or the drive motor are fixedly connected to the bucket lid.

3. The high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives according to claim 2, characterized in that, The first drive shaft is provided with a first driven gear at the end away from the anchor-type stirring paddle, the second drive shaft is provided with a second driven gear at the end away from the turbine-type dispersing paddle, and the third drive shaft is provided with a third driven gear at the end away from the spiral-type guide paddle; The reducer includes a base and a drive shaft. The base has a bearing seat hole, a first cylindrical hole, a second cylindrical hole, and a third cylindrical hole that are connected in sequence. The bearing seat hole is used to insert the first drive shaft and forms a bearing connection with the first drive shaft. The first cylindrical hole is used to insert the first driven gear, the second cylindrical hole is used to insert the second driven gear, and the third cylindrical hole is used to insert the third driven gear. The diameter of the first driven gear is smaller than the diameter of the second driven gear, and the diameter of the second driven gear is smaller than the diameter of the third driven gear. The drive shaft is rotatably connected to the base via a bearing and has a first drive gear, a second drive gear, and a third drive gear arranged in sequence from top to bottom. The second drive gear is used to mesh with the second driven gear, and the third drive gear is used to mesh with the third driven gear. The reducer also includes a transmission gear rotatably connected to the base. The transmission gear is disposed between the first cylindrical hole and the first drive gear and meshes with the first drive gear. The transmission gear meshes with the first driven gear so that the rotation direction of the first drive shaft is the same as that of the drive shaft and opposite to that of the third drive shaft and the second drive shaft.

4. The high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives according to claim 3, characterized in that, The first drive shaft has a first retaining ring at one end and a second retaining ring at the other end. The first retaining ring is used to limit the depth of the first drive shaft inserted into the bearing seat hole, and the second retaining ring is used to prevent the second drive shaft from sliding downward along the first drive shaft. The second drive shaft is provided with a third retaining ring at one end and a fourth retaining ring at the other end. The third retaining ring is used to limit the depth of the second drive shaft inserted into the first cylindrical hole, and the fourth retaining ring is used to prevent the third drive shaft from sliding downward along the second drive shaft. A fifth retaining ring is provided on the third drive shaft above the third driven gear. The fifth retaining ring is used to limit the depth to which the third drive shaft is inserted into the second cylindrical hole.

5. The high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives according to any one of claims 1-4, characterized in that, The rotational speed of the anchor-type stirring paddle is 20-50 r / min; The rotational speed of the turbine-type dispersing paddle is 150-300 r / min; The rotational speed of the helical guide propeller is 80-120 r / min.

6. The high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives according to claim 1, characterized in that, The barrel body includes an inner barrel body and an outer barrel body fitted onto the inner barrel body, wherein the inner barrel body and the outer barrel body are spaced apart. The bucket lid is detachably and sealingly connected to the inner bucket body and / or the outer bucket body, and the inner bucket body and the bucket lid enclose the stirring space; A support partition is provided between the inner barrel and the outer barrel to restrict the position of the inner barrel within the outer barrel, and / or to divide the space between the inner barrel and the outer barrel into several functional cavities or functional areas. The supporting partition is fixedly connected to the inner barrel and / or the outer barrel.

7. The high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives according to claim 6, characterized in that, The heat medium circulation system includes a heat coil and a heat medium inlet pipe joint and a heat medium outlet pipe joint disposed on the outer wall of the outer barrel. One end of the heat coil is connected to the heat medium inlet pipe joint, and the other end is connected to the heat medium outlet pipe joint. The refrigerant circulation system includes a cold coil, and a refrigerant inlet pipe joint and a refrigerant outlet pipe joint disposed on the outer wall of the outer barrel. One end of the cold coil is connected to the refrigerant inlet pipe joint, and the other end is connected to the refrigerant outlet pipe joint. The hot coil and the cold coil are arranged side by side and wrapped around the bottom surface and / or outer wall of the inner barrel, so that the hot coil and the cold coil are generally arranged alternately.

8. The high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives according to claim 1 or 6, characterized in that, It also includes a first temperature sensor and a second temperature sensor. The temperature detection ends of the first temperature sensor and the second temperature sensor are fixed inside the barrel to detect the temperature of the material being stirred inside the mixing barrel. The installation position of the first temperature sensor is higher than the installation position of the second temperature sensor, so that the first temperature sensor detects the temperature of the upper part of the material being stirred, and the second temperature sensor detects the temperature of the lower part of the material being stirred.

9. The high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives according to claim 8, characterized in that, The first temperature sensor and the second temperature sensor are PT100 platinum resistance sensors.

10. The high-pressure temperature-controlled stirring tank for nano-SiO2 / starch-based composite adhesives according to claim 6, characterized in that, It also includes a third temperature sensor; The third temperature sensor is positioned against the inner barrel body and is used to detect the wall temperature of the inner barrel body. The third temperature sensor is installed at the bottom of the inner barrel.

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