Synthesis Equipment and Synthesis Method of a Modified Styrene-Butadiene Emulsion

Abstract

The invention discloses a synthesis device and a synthesis method of a modified styrene butadiene emulsion, and the invention relates to the technical field of adhesive production. The invention comprises a reactor, a synthesis device and a synthesis method of a modified styrene butadiene emulsion, a stirring blade assembly can be driven by a gear ring mechanism to reciprocate up and down while stirring the material axially, and can achieve the effect of turning the upper layer material and the lower layer material while stirring the material, solving the problem that the stirring blade of the stirring device in the current reactor is fixedly installed on the stirring shaft and cannot move up and down, making the stirring action flexible and changeable, and the upper layer and the lower layer material in the reactor can be quickly mixed, saving the mixing and stirring time. The gear and the gear ring mechanism are meshed to realize the synchronous revolution and rotation, which can greatly improve the stirring efficiency, and the reciprocating motion of the piston plate is realized by the stirring blade rotating and cooperating with the jacking assembly, and there is no need to set a driving device for the movement of the piston plate separately, making the structure simpler.

Description

Technical Field

[0001] The present invention relates to the technical field of binder production, and particularly to a synthesis device and a synthesis method for modified styrene-butadiene emulsion. Background Art

[0002] In the preparation process of modified styrene-butadiene emulsion, carboxylic acid monomers, butadiene monomers, styrene or methyl styrene, functional monomers, molecular weight regulators, reactive emulsifiers and initiators need to be mixed, and the aqueous solution of the mixture is subjected to free radical emulsion copolymerization. During the synthesis process of modified styrene-butadiene emulsion, stirring and mixing need to be carried out in a reaction kettle. Currently, the general reaction kettle is driven by a stirring motor to rotate a stirring shaft, and the stirring blades are used to stir the materials. However, the stirring blades are fixedly installed on the stirring shaft and cannot move up and down, which results in a fixed stirring action. The upper and lower materials in the reaction kettle cannot be quickly mixed, and it often takes a long time to achieve uniform mixing of the raw materials. In addition, a large amount of foam will be generated during the stirring and mixing of the modified styrene-butadiene emulsion synthesis device, which affects the use of the synthesized emulsion. Therefore, the present invention proposes a synthesis device and a synthesis method for modified styrene-butadiene emulsion to solve the above problems. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a synthesis device and a synthesis method for modified styrene-butadiene emulsion, which solve the problems that the stirring blades of the stirring device in the current reaction kettle are fixedly installed on the stirring shaft and cannot move up and down, resulting in a fixed stirring action, the upper and lower materials in the reaction kettle cannot be quickly mixed, and it often takes a long time to achieve uniform mixing of the raw materials, and a large amount of foam will be generated during the stirring and mixing, which affects the use of the synthesized emulsion.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A synthesis device for modified styrene-butadiene emulsion, comprising a reaction kettle. One side of the top of the reaction kettle is fixedly provided with a feeding hopper for providing raw materials for the production of modified styrene-butadiene emulsion, and a discharging pipe for discharging the modified styrene-butadiene emulsion is fixedly provided below the side wall of the reaction kettle. Annular grooves are equidistantly arranged on the inner wall of the reaction kettle from top to bottom. A toothed ring mechanism is arranged inside the annular groove. A mixing mechanism for stirring the raw materials for the production of modified styrene-butadiene emulsion is rotatably arranged inside the reaction kettle. A servo motor for driving the mixing mechanism to rotate is fixedly provided on the top of the reaction kettle, and an exhaust hole for discharging the gas inside the mixing mechanism is opened at the bottom of the reaction kettle.

[0005] The toothed ring mechanism includes a steel ring fixedly arranged on the inner wall of the annular groove. The top of the steel ring is respectively fixedly provided with a special-shaped rack and an arc rack, and the special-shaped rack and the arc rack are distributed in a cyclic and alternating manner.

[0006] The mixing mechanism includes a stirring rod, long strip-shaped through grooves opened on both sides of the outer wall of the stirring rod, and a protective cylinder rotatably sleeved on the outer wall of the stirring rod. The inside of the stirring rod is a hollow structure, and its cavity and the long strip-shaped through grooves together form a lifting cavity. A lifting rod is slidably arranged inside the lifting cavity. On both sides of the outer wall of the lifting rod and located inside the long strip-shaped through grooves, long strip-shaped limiting blocks are fixedly arranged. A spring pressing plate is fixedly arranged at the bottom end of the lifting rod. A first spring is sleeved on the outer wall of the long strip-shaped limiting blocks and above the spring pressing plate. Stirring blade assemblies for stirring the production raw materials of modified styrene-butadiene emulsion are arranged on the outer walls of both long strip-shaped limiting blocks.

[0007] Preferably, the output shaft of the servo motor rotates through the reaction kettle and is connected to the stirring rod through a coupling. The bottom end of the protective cylinder is fixedly connected to the bottom of the reaction kettle cavity. The exhaust hole is communicated with the inside of the protective cylinder.

[0008] Preferably, the bottom end of the lifting rod slides through the stirring rod and extends into the protective cylinder. The spring pressing plate is slidably arranged inside the protective cylinder. The first spring is located inside the cavity of the protective cylinder.

[0009] Preferably, the special-shaped rack includes an arc-shaped convex block and equally spaced teeth. The arc-shaped convex block is fixedly arranged on the top of the steel ring, and the teeth are fixedly arranged on the upper surface of the arc-shaped convex block.

[0010] Preferably, the stirring blade assembly includes a stirring blade, a gear fixedly arranged at one end of the stirring blade, and liquid inlet openings opened at one end of the stirring blade and located on both sides of the gear. First one-way valves for only allowing liquid to enter are fixedly arranged inside both liquid inlet openings. A liquid outlet is opened on one side of the stirring blade near the first one-way valve. A defoaming assembly for filtering the foam of the modified styrene-butadiene emulsion is fixedly arranged inside the liquid outlet. The defoaming assembly includes a filter cylinder and a second one-way valve fixedly arranged inside the filter cylinder for only allowing liquid to be discharged. A piston plate is slidably arranged inside the stirring blade and on one side of the filter cylinder. On both sides of the side wall of the piston plate away from the filter cylinder, connecting rods are fixedly arranged. The connecting rods slide through the stirring blade and fixedly arranged hemispheres. A second spring is sleeved on the outer wall of the connecting rods and between the hemispheres and the stirring blade. A jacking mechanism for pushing the hemispheres to move is arranged on one side of the stirring blade.

[0011] Preferably, the jacking mechanism includes a circular plate and arc-shaped convex blocks. The arc-shaped convex blocks are evenly fixedly arranged on the outer wall of the circular plate.

[0012] Preferably, the gear is meshed with the special-shaped rack and the arc-shaped rack. The circular plate is fixedly arranged on the side wall of the long strip-shaped limiting block.

[0013] Preferably, the stirring blade is rotatably arranged on the side wall of the circular plate through a rotating shaft. The number of the arc-shaped convex blocks is an even number.

[0014] The present invention also provides a synthesis method for a synthesis device of a modified styrene-butadiene emulsion. The specific method includes the following steps:

[0015] Step 1, adding synthesis raw materials: successively add the raw materials for synthesizing the modified styrene-butadiene emulsion into the reaction kettle through the feeding hopper.

[0016] Step 2, axial stirring: drive the stirring rod to rotate along its axis by means of a servo motor, and multiple stirring blade assemblies rotate synchronously with the stirring rod to stir the raw materials of the modified styrene-butadiene emulsion.

[0017] Step 3, longitudinal stirring: during the rotation of the stirring blade assembly, it continuously meets the special-shaped rack and the arc rack alternately. When the stirring blade assembly is meshed and connected with the special-shaped rack, it is lifted, and the lifting rod slides upward along the inner wall of the stirring rod synchronously with the stirring blade assembly. The first spring is compressed by the inner wall of the protective cylinder. When the stirring blade assembly is meshed and connected with the arc rack, the elastic force of the first spring pushes the spring pressing plate downward, and the lifting rod slides downward along the inner wall of the stirring rod. The stirring blade assembly turns the raw materials in the upper and lower layers inside the reaction kettle up and down for stirring.

[0018] Step 4, defoaming treatment: during the stirring of the raw materials of the modified styrene-butadiene emulsion by the stirring blade assembly, the raw materials are simultaneously sucked into its interior, and the foam is filtered by the filtering structure.

[0019] Preferably, the servo motor rotates at a constant speed, and the rotation speed is 30 r / min.

[0020] Beneficial effects

[0021] The present invention provides a synthesis device and a synthesis method for a modified styrene-butadiene emulsion. Compared with the prior art, the following beneficial effects are achieved:

[0022] 1. A synthesis device and synthesis method for a modified styrene-butadiene emulsion. The mixing mechanism includes a stirring rod, long strip-shaped through grooves opened on both sides of the outer wall of the stirring rod, and a protective cylinder rotatably sleeved on the outer wall of the stirring rod. The inside of the stirring rod is a hollow structure, and its cavity and the long strip-shaped through grooves together form a lifting cavity. A lifting rod is slidably arranged inside the lifting cavity. Long strip-shaped limiting blocks are fixedly arranged on both sides of the outer wall of the lifting rod and located inside the long strip-shaped through grooves. A spring pressing plate is fixedly arranged at the bottom end of the lifting rod. A first spring is sleeved on the outer wall of the long strip-shaped limiting block and above the spring pressing plate. Stirring blade assemblies for stirring the production raw materials of the modified styrene-butadiene emulsion are arranged on the outer walls of both long strip-shaped limiting blocks. While the stirring blade assemblies perform axial stirring actions along with the stirring shaft, they can reciprocate up and down under the push of the gear ring mechanism, achieving the effect of turning the upper-layer materials and the lower-layer materials while stirring the materials, solving the problem that the stirring blades of the stirring device in the current reaction kettle are fixedly installed on the stirring shaft and cannot move up and down, making the stirring action flexible and variable, enabling the rapid mixing of the upper-layer and lower-layer materials in the reaction kettle, and saving the mixing and stirring time.

[0023] 2. A synthesis device and synthesis method for a modified styrene-butadiene emulsion. The rotation of the stirring rod drives the synchronous rotation of the stirring blades, and the meshing of the gear and the gear ring mechanism enables the synchronous progress of revolution and rotation, which can greatly improve the stirring efficiency of the raw materials of the modified styrene-butadiene emulsion. At the same time, the alternating arrangement of the special-shaped rack and the arc-shaped rack of the gear ring mechanism, and the height of the special-shaped rack is higher than that of the arc-shaped rack, can achieve the intermittent lifting action of the driving gear while driving the gear to rotate. This process does not require a separate driving device for the stirring blade assembly, reducing the manufacturing cost.

[0024] 3. A synthesis device and method for a modified styrene-butadiene emulsion. The stirring blade assembly includes a stirring blade, a gear fixedly arranged at one end of the stirring blade, and liquid inlets opened at one end of the stirring blade and located on both sides of the gear. First one-way valves for only allowing liquid to enter are fixedly arranged inside both liquid inlets. A liquid outlet is opened on one side of the top of the stirring blade near the first one-way valve. An antifoaming assembly for filtering the foam of the modified styrene-butadiene emulsion is fixedly arranged inside the liquid outlet. The antifoaming assembly includes a filter cartridge and a second one-way valve fixedly arranged inside the filter cartridge for only allowing liquid to be discharged. A piston plate is slidably arranged inside the stirring blade and on one side of the filter cartridge. Connecting rods are fixedly arranged on both sides of the side wall of the piston plate far from the filter cartridge. The connecting rods slidably penetrate through the stirring blade and are fixedly provided with hemispheres. A second spring is sleeved on the outer wall of the connecting rod between the hemisphere and the stirring blade. A lifting mechanism for pushing the hemisphere to move is arranged on one side of the stirring blade. By utilizing the meshing transmission characteristic of the gear ring mechanism and the gear, the stirring blade assembly can revolve and rotate along its own axis simultaneously, so as to realize the reciprocating motion of the piston plate 686 under the action of the pushing assembly, and can perform the "swallowing and spitting" operation on the liquid in the reaction kettle. And when the liquid is discharged from the cavity of the stirring blade, the filter cartridge is used to filter its foam, thereby reducing the foam generated during stirring and being beneficial to the use of the synthesized emulsion.

[0025] 4. A synthesis device and method for a modified styrene-butadiene emulsion. The reciprocating motion of the piston plate is realized by the cooperation of the rotation of the stirring blade and the lifting assembly. This process does not require a separate driving device for the movement of the piston plate, saving the manufacturing cost of setting up the driving device, and at the same time making the device structure simpler and facilitating subsequent maintenance and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the first overall three-dimensional structure of the present invention;

[0027] Figure 2 It is a schematic sectional structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the second overall three-dimensional structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the enlarged structure of part A of the present invention;

[0030] Figure 5 It is a schematic three-dimensional structure of the gear ring mechanism of the present invention;

[0031] Figure 6 It is a schematic exploded three-dimensional structure of the mixing mechanism of the present invention;

[0032] Figure 7 It is a schematic diagram of the enlarged structure of part B of the present invention;

[0033] Figure 8Schematic cross-sectional structure diagram of the stirring blade assembly of the present invention;

[0034] Figure 9 Schematic enlarged structure diagram of part C of the present invention;

[0035] Figure 10 Process flow chart of the present invention.

[0036] In the figure: 1, reaction kettle; 2, feeding hopper; 3, discharge pipe; 4, annular groove; 5, gear ring mechanism; 51, steel ring; 52, special-shaped rack; 53, arc rack; 6, mixing mechanism; 61, stirring rod; 62, long strip through groove; 63, protective cylinder; 64, first spring; 65, lifting rod; 66, long strip limit block; 67, spring pressing plate; 68, stirring blade assembly; 681, stirring blade; 682, gear; 683, first one-way valve; 684, filter cartridge; 685, second one-way valve; 686, piston plate; 687, connecting rod; 688, hemispherical body; 689, second spring; 6810, top pushing assembly; 68101, round plate; 68102, arc convex block; 7, servo motor; 8, exhaust hole. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] The present invention provides two technical solutions:

[0039] Such as Figure 1-7,10 shows the first embodiment: a synthesis device for modified styrene-butadiene emulsion, including a reaction kettle 1. On one side of the top of the reaction kettle 1, a feeding hopper 2 for providing raw materials for the production of modified styrene-butadiene emulsion is fixedly arranged. And a discharging pipe 3 for discharging the modified styrene-butadiene emulsion is fixedly arranged below the side wall of the reaction kettle 1. Annular grooves 4 are equidistantly arranged on the inner wall of the reaction kettle 1 from top to bottom. A toothed ring mechanism 5 is arranged inside the annular groove 4. A mixing mechanism 6 for stirring the raw materials of the modified styrene-butadiene emulsion is rotatably arranged inside the reaction kettle 1. A servo motor 7 for driving the mixing mechanism 6 to rotate is fixedly arranged on the top of the reaction kettle 1. And an exhaust hole 8 for discharging the gas inside the mixing mechanism 6 is arranged at the bottom of the reaction kettle 1. The toothed ring mechanism 5 includes a steel ring 51 fixedly arranged on the inner wall of the annular groove 4. An irregular rack 52 and an arc rack 53 are respectively fixedly arranged on the top of the steel ring 51. The irregular rack 52 and the arc rack 53 are distributed in a cyclic and alternating manner. The highest position of the top of the steel ring 51 is set with a safe moving distance from the top of the annular groove 4 to ensure that the gear 682 will not interfere with the inner wall of the annular groove 4 during the rising process. The mixing mechanism 6 includes a stirring rod 61, long strip-shaped through grooves 62 opened on both sides of the outer wall of the stirring rod 61, and a protective cylinder 63 rotatably sleeved on the outer wall of the stirring rod 61. The inside of the stirring rod 61 is a hollow structure, and its cavity and the long strip-shaped through groove 62 together form a lifting cavity. A lifting rod 65 is slidably arranged inside the lifting cavity. On both sides of the outer wall of the lifting rod 65 and inside the long strip-shaped through groove 62, long strip-shaped limiting blocks 66 are fixedly arranged. A spring pressing plate 67 is fixedly arranged at the bottom end of the lifting rod 65. A first spring 64 is sleeved on the outer wall of the long strip-shaped limiting block 66 and above the spring pressing plate 67. Stirring blade assemblies 68 for stirring the raw materials of the modified styrene-butadiene emulsion are arranged on the outer walls of both long strip-shaped limiting blocks 66. The output shaft of the servo motor 7 rotates through the reaction kettle 1 and is connected to the stirring rod 61 through a coupling. The bottom end of the protective cylinder 63 is fixedly connected to the bottom of the cavity of the reaction kettle 1. The exhaust hole 8 is communicated with the inside of the protective cylinder 63. The bottom end of the lifting rod 65 slides through the stirring rod 61 and extends into the protective cylinder 63. The spring pressing plate 67 is slidably arranged inside the protective cylinder 63. The first spring 64 is located inside the cavity of the protective cylinder 63. The length of the long strip-shaped through groove 62 is greater than that of the long strip-shaped limiting block 66. When the lifting rod 65 slides to the uppermost and lowermost limit positions, there is still a certain distance between its bottom end and top end and the bottom and top of the long strip-shaped through groove 62, and no interference will occur. The irregular rack 52 includes a circular arc convex block and equally spaced teeth. The circular arc convex block is fixedly arranged on the top of the steel ring 51, and the teeth are fixedly arranged on the upper surface of the circular arc convex block. The servo motor 7 rotates at a constant speed, and the rotation speed is 30 r / min.

[0040] As Figure 8-9The second embodiment is shown. The main difference from the first embodiment lies in: a synthesis device for modified styrene-butadiene emulsion. The stirring blade assembly 68 includes a stirring blade 681, a gear 682 fixedly arranged at one end of the stirring blade 681, and liquid inlets opened at one end of the stirring blade 681 and located on both sides of the gear 682. A first one-way valve 683 for only allowing liquid to enter is fixedly arranged inside each of the two liquid inlets. A liquid outlet is opened on one side of the top of the stirring blade 681 near the first one-way valve 683. An anti-foaming component for filtering the foam of the modified styrene-butadiene emulsion is fixedly arranged inside the liquid outlet. The anti-foaming component includes a filter cartridge 684 and a second one-way valve 685 fixedly arranged inside the filter cartridge 684 for only allowing liquid to be discharged. Filter holes are evenly opened on the surface of the filter cartridge 684, and the inner diameter of the filter holes is smaller than the outer diameter of the smallest foam. A piston plate 686 is slidably arranged inside the stirring blade 681 and on one side of the filter cartridge 684. Connecting rods 687 are fixedly arranged on both sides of the side wall of the piston plate 686 away from the filter cartridge 684. The connecting rods 687 slidably penetrate through the stirring blade 681 and are fixedly provided with hemispheres 688. A second spring 689 is sleeved on the outer wall of the connecting rod 687 between the hemisphere 688 and the stirring blade 681. A jacking mechanism for pushing the hemisphere 688 to move is arranged on one side of the stirring blade 681. The jacking mechanism includes a circular plate 68101 and arc-shaped protrusions 68102. The arc-shaped protrusions 68102 are evenly fixedly arranged on the outer wall of the circular plate 68101. The gear 682 is meshed and connected with the special-shaped rack 52 and the arc-shaped rack 53. The circular plate 68101 is fixedly arranged on the side wall of the long strip-shaped limiting block 66. The stirring blade 681 is rotatably arranged on the side wall of the circular plate 68101 through a rotating shaft. The number of the arc-shaped protrusions 68102 is an even number to ensure that the two connecting rods 687 can be jacked up simultaneously.

[0041] The embodiment of the present invention also provides a synthesis method for a synthesis device of modified styrene-butadiene emulsion. The specific method includes the following steps:

[0042] Step 1: Adding synthesis raw materials: Sequentially add the raw materials for synthesizing the modified styrene-butadiene emulsion into the reaction kettle 1 through the feeding hopper 2;

[0043] Step 2: Axial stirring: Drive the stirring rod 61 to rotate along its axis by means of the servo motor 7, and multiple stirring blade assemblies 68 rotate synchronously with the stirring rod 61 to stir the raw materials of the modified styrene-butadiene emulsion;

[0044] Step 3. Vertical stirring: During the rotation of the stirring blade assembly 68, it continuously encounters the special-shaped rack 52 and the arc-shaped rack 53 alternately. When the gear 682 in the stirring blade assembly 68 is meshed and connected with the special-shaped rack 52, it is lifted. The lifting rod 65 slides upward along the inner wall of the stirring rod 61 synchronously with the stirring blade assembly 68. The first spring 64 is compressed by the obstruction of the inner wall of the protective cylinder 63. When the gear 682 in the stirring blade assembly 68 is meshed and connected with the arc-shaped rack 53, the elastic force of the first spring 64 pushes the spring pressing plate 67 downward, and the lifting rod 65 slides downward along the inner wall of the stirring rod 61. The stirring blade assembly 68 stirs the upper and lower layers of raw materials inside the reaction kettle 1 up and down.

[0045] Step 4. Defoaming treatment: During the stirring of the modified styrene-butadiene emulsion raw material by the stirring blade assembly 68, the raw material is simultaneously sucked into it. When the stirring blade 681 rotates, the two hemispheres 688 are intermittently and synchronously pushed by the arc-shaped protrusions 68102. The piston plate 686 moves along the inner wall of the stirring blade 681 towards the gear 682, and the sucked liquid is discharged after being filtered by the filter cylinder 684. The bubbles in the liquid are filtered out and retained in the filter cylinder 684. When the hemispheres 688 lose the push of the arc-shaped protrusions 68102, the elastic force of the second spring 689 pushes the hemispheres 688 back to their original positions, and the piston plate 686 slides in the reverse direction. A negative pressure state is formed in the cavity of the stirring blade 681 and on the right side of the piston plate 686. Since the first one-way valve 683 and the second one-way valve 685 are respectively arranged at the liquid inlet and the liquid outlet of the stirring blade 681, external liquid enters the cavity of the stirring blade 681 through the liquid inlet. When the hemispheres 688 meet the arc-shaped protrusions 68102 again, repeating the above operation can filter the foam by using the filtering structure.

[0046] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A synthesis device for modified styrene-butadiene emulsion, comprising a reaction kettle (1), characterized in that: On one side of the top of the reactor (1), a feeding hopper (2) for providing raw materials for the production of modified styrene-butadiene emulsion is fixedly arranged, and on the lower side of the side wall of the reactor (1), a discharging pipe (3) for discharging the modified styrene-butadiene emulsion is fixedly arranged. Annular grooves (4) are equidistantly arranged on the inner wall of the reactor (1) from top to bottom. A toothed ring mechanism (5) is arranged inside the annular groove (4). A mixing mechanism (6) for stirring the raw materials for the production of modified styrene-butadiene emulsion is rotatably arranged inside the reactor (1). A servo motor (7) for driving the mixing mechanism (6) to rotate is fixedly arranged on the top of the reactor (1), and an exhaust hole (8) for discharging the gas inside the mixing mechanism (6) is arranged at the bottom of the reactor (1). The toothed ring mechanism (5) includes a steel ring (51) fixedly arranged on the inner wall of the annular groove (4). An irregular rack (52) and an arc rack (53) are respectively fixedly arranged on the top of the steel ring (51). The irregular rack (52) and the arc rack (53) are distributed in a cyclic and alternating manner. The mixing mechanism (6) includes a stirring rod (61), long strip-shaped through grooves (62) opened on both sides of the outer wall of the stirring rod (61), and a protective cylinder (63) rotatably sleeved on the outer wall of the stirring rod (61). The inside of the stirring rod (61) is a hollow structure, and its cavity and the long strip-shaped through grooves (62) together form a lifting cavity. A lifting rod (65) is slidably arranged inside the lifting cavity. Long strip-shaped limiting blocks (66) are fixedly arranged on both sides of the outer wall of the lifting rod (65) and located inside the long strip-shaped through grooves (62). A spring pressing plate (67) is fixedly arranged at the bottom end of the lifting rod (65). A first spring (64) is sleeved on the outer wall of the long strip-shaped limiting block (66) and above the spring pressing plate (67). Stirring blade assemblies (68) for stirring the raw materials for the production of modified styrene-butadiene emulsion are arranged on the outer walls of both long strip-shaped limiting blocks (66). The irregular rack (52) includes a circular arc-shaped convex block and equidistantly distributed teeth. The circular arc-shaped convex block is fixedly arranged on the top of the steel ring (51), and the teeth are fixedly arranged on the upper surface of the circular arc-shaped convex block. The stirring blade assembly (68) includes a stirring blade (681), a gear (682) fixedly arranged at one end of the stirring blade (681), and liquid inlets formed at one end of the stirring blade (681) and located on both sides of the gear (682). A first one-way valve (683) for only allowing liquid to enter is fixedly arranged inside each of the two liquid inlets. An outlet is formed on one side of the top of the stirring blade (681) near the first one-way valve (683). An anti-foaming assembly for filtering the foam of the modified styrene-butadiene emulsion is fixedly arranged inside the outlet. The anti-foaming assembly includes a filter cartridge (684) and a second one-way valve (685) fixedly arranged inside the filter cartridge (684) for only allowing liquid to discharge. A piston plate (686) is slidably arranged inside the stirring blade (681) and on one side of the filter cartridge (684). Connecting rods (687) are fixedly arranged on both sides of the side wall of the piston plate (686) away from the filter cartridge (684). The connecting rods (687) slidably penetrate through the stirring blade (681) and are fixedly provided with hemispheres (688). A second spring (689) is sleeved on the outer wall of the connecting rod (687) between the hemisphere (688) and the stirring blade (681). A jacking mechanism for pushing the hemisphere (688) to move is arranged on one side of the stirring blade (681). The jacking mechanism includes a circular plate (68101) and arc-shaped bumps (68102). The arc-shaped bumps (68102) are evenly and fixedly arranged on the outer wall of the circular plate (68101).

2. The synthesis equipment of a modified styrene-butadiene emulsion according to claim 1, characterized in that: The output shaft of the servo motor (7) rotatably penetrates through the reaction kettle (1) and is connected to the stirring rod (61) through a coupling. The bottom end of the protective cylinder (63) is fixedly connected to the bottom of the cavity of the reaction kettle (1). The exhaust hole (8) is communicated with the inside of the protective cylinder (63).

3. The synthesis equipment of a modified styrene-butadiene emulsion according to claim 1, characterized in that: The bottom end of the lifting rod (65) slidably penetrates through the stirring rod (61) and extends into the protective cylinder (63). The spring pressing plate (67) is slidably arranged inside the protective cylinder (63). The first spring (64) is located inside the cavity of the protective cylinder (63).

4. The synthesis equipment of a modified styrene-butadiene emulsion according to claim 1, characterized in that: The gear (682) is meshed and connected with the special-shaped rack (52) and the arc-shaped rack (53). The circular plate (68101) is fixedly arranged on the side wall of the long strip-shaped limiting block (66).

5. The synthesis equipment of a modified styrene-butadiene emulsion according to claim 1, characterized in that: The stirring blade (681) is rotatably arranged on the side wall of the circular plate (68101) through a rotating shaft. The number of the arc-shaped bumps (68102) is an even number.

6. A synthesis method of a synthesis device for modified styrene-butadiene emulsion according to claim 1, characterized in that: The method includes the following steps: Step 1, adding synthetic raw materials: successively add the raw materials for synthesizing the modified styrene-butadiene emulsion into the reaction kettle (1) through the feeding hopper (2); Step 2, axial stirring: drive the stirring rod (61) to rotate along its axis by means of the servo motor (7), and multiple stirring blade assemblies (68) rotate synchronously with the stirring rod (61) to stir the raw materials of the modified styrene-butadiene emulsion; Step 3: Vertical stirring: During the rotation of the stirring blade assembly (68), it continuously encounters the special-shaped rack (52) and the arc rack (53) alternately. When the stirring blade assembly (68) is meshed and connected with the special-shaped rack (52), it is lifted, and the lifting rod (65) slides upward along the inner wall of the stirring rod (61) synchronously with the stirring blade assembly (68). The first spring (64) is compressed by the inner wall of the protective cylinder (63). When the stirring blade assembly (68) is meshed and connected with the arc rack (53), the elastic force of the first spring (64) pushes the spring pressing plate (67) downward, and the lifting rod (65) slides downward along the inner wall of the stirring rod (61). The stirring blade assembly (68) stirs the upper and lower layers of raw materials inside the reaction kettle (1) up and down. Step 4: Defoaming treatment: During the stirring of the modified styrene-butadiene emulsion raw materials by the stirring blade assembly (68), the raw materials are simultaneously sucked into it, and the foam is filtered by the filtering structure.

7. The synthesis method of a synthesis device for a modified styrene-butadiene emulsion according to claim 6, characterized in that: The servo motor (7) rotates at a constant speed, and the rotation speed is 30 r / min.

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