A kind of reaction kettle of styrene butadiene latex

Abstract

The present invention relates to the field of reactors, and in particular to a reactor for styrene-butadiene latex, comprising a reactor body and a stirring shaft, wherein the reactor body is provided with a stirring shaft, a reactor cover of the reactor body is provided with a driving motor, and the stirring shaft is mounted on the rotating shaft of the driving motor; it also comprises a connecting ring 1, wherein two connecting rings 1 are provided, and the two connecting rings 1 are vertically distributed and mounted on the stirring shaft; a connecting arm 1, wherein each connecting ring 1 is respectively provided with two connecting arms 1 that are symmetrically distributed; and a scraper, wherein two scrapers are provided, and both scrapers are inclined to the inner wall of the reactor body and are symmetrical about the axis center of the stirring shaft. The present invention disturbs the material near the inner wall of the reactor body through the inclined scraper, and guides this part of the material to continuously flow to the middle of the reactor body, that is, close to the stirring shaft, and the inclined scraper has a smaller movement resistance.

Description

Technical Field

[0001] The invention relates to the field of reaction kettles, in particular to a reaction kettle for styrene-butadiene latex. Background Art

[0002] Styrene butadiene latex is a stable emulsion formed by low-temperature polymerization of butadiene and styrene. In the synthesis reaction of styrene butadiene latex, the viscous material will stick to the wall of the reactor of styrene butadiene latex, affecting the temperature conduction efficiency of the reactor wall and hindering the full progress of the reaction.

[0003] For example, CN221536700U discloses a chemical reactor for preventing materials from adhering to the inner wall of the reactor. The reactor scrapes off the attachments on the inner wall of the reactor by arranging a scraper in the reactor. However, the reactor has defects: first, the scraped materials still stay at a position close to the inner wall of the reactor, which is far away from the stirring area of ​​the stirring shaft. Therefore, the scraped materials cannot be quickly dispersed and are still in a piled state, which is not conducive to the reaction; second, the scraper is always in a state perpendicular to the inner wall of the reactor and is in contact and friction with the inner wall, which not only increases the rotation resistance of the stirring shaft and consumes a lot of energy, but also causes wear between the scraper and the inner wall of the reactor. Summary of the invention

[0004] In order to overcome the shortcomings of the scraper structure of the existing reactor that it is not conducive to the rapid dispersion of the scraped materials and the scraper structure has a large wear, the present invention provides a reactor for styrene-butadiene latex.

[0005] The technical solution is: a reaction kettle for styrene-butadiene latex, comprising a kettle body and a stirring shaft, wherein the kettle body is provided with a stirring shaft, and a kettle cover of the kettle body is provided with a driving motor, and the stirring shaft is installed on the rotating shaft of the driving motor; it also comprises a connecting ring 1, wherein two connecting rings 1 are provided, and the two connecting rings 1 are vertically distributed and installed on the stirring shaft; a connecting arm 1, wherein each connecting ring 1 is respectively provided with two connecting arms 1 that are symmetrically distributed; a scraper, wherein two scrapers are provided, and the two scrapers are both inclined to the inner wall of the kettle body and are symmetrical about the axis center of the stirring shaft, and the two ends of the scraper are respectively installed on one of the connecting arms 1 of the two connecting rings 1, so that the material close to the inner wall of the kettle body is disturbed by the inclined scraper, and this part of the material is guided to continuously flow to the middle of the kettle body, that is, close to the stirring shaft, and the inclined scraper has smaller movement resistance.

[0006] As an improvement of the above solution, the scraping edges of the two scrapers are both configured as tooth-like structures, and the concave-convex distribution of the tooth-like structures of the two scrapers is staggered.

[0007] As an improvement of the above scheme, the scraper and the connecting arm 1 are rotatably connected and a torsion spring is connected between the scraper and the connecting arm 1. The outer ring surface of the kettle body is provided with two outer grooves, and an electric telescopic member is installed in each of the two outer grooves. The telescopic end of the electric telescopic member penetrates the kettle body and moves in the inner groove provided on the inner wall of the kettle body. A connecting arm 2 is installed at the telescopic end of each of the electric telescopic members. A connecting ring 2 is installed between the two connecting arms 2. The connecting ring 1 located above is rotatably connected to the inner ring of the connecting ring 2. The connecting ring 2 is located above the connecting arm 1, an internal spline structure is provided in the connecting ring 1, an external spline structure is provided on the stirring shaft, the connecting ring 1 is connected to the stirring shaft through the spline structure, a limiting column is installed on the upper surface of each of the two scrapers, a limiting ring is installed on the inner wall of the kettle body, the lower surface of the limiting ring is an inclined surface with a low inner ring and a high outer ring, the lifting and lowering of the limiting column is controlled by the telescopic end of the electric telescopic part, so that the limiting column moves along the inclined surface of the limiting ring, thereby realizing the rotation of the scraper to adjust the angle of the scraper.

[0008] As an improvement of the above solution, in the initial state, the scraping edge of the scraper faces outward and contacts the inner wall of the kettle body. When the limiting column moves to the highest point along the inclined surface of the limiting ring, the scraping edge of the scraper faces inward.

[0009] As an improvement of the above solution, when the limiting column moves to the highest point along the inclined surface of the limiting ring, the internal spline structure of the connecting ring 1 is disengaged from the external spline structure of the stirring shaft.

[0010] As an improvement of the above solution, a plurality of defoaming needles are respectively installed on the lower surfaces of the two connecting arms 1 located on the upper connecting ring 1.

[0011] As an improvement of the above solution, all the defoaming needles on the connecting arm 1 are arranged to have lengths that gradually increase from a side close to the stirring shaft to a side away from the stirring shaft.

[0012] As an improvement of the above solution, the interior of the defoaming needle is configured to be hollow and penetrated from top to bottom, and each of the connecting arms is provided with a plurality of through holes, which are connected to the hollow structure inside the defoaming needle.

[0013] As an improvement of the above solution, the bottom surface of the inner groove is an inclined surface.

[0014] As an improvement of the above solution, the upper surface of the limiting ring is an arc surface or an inclined surface with a lower inner ring and a higher outer ring.

[0015] The present invention has the following advantages: the present invention sets the scraper to be inclined to the inner wall of the kettle body, which can not only realize the scraping operation on the inner wall of the kettle body, but also act as a guiding spoiler. The inclined scraper is used to disturb the material close to the inner wall of the kettle body, and guide this part of the material to continuously flow to the middle of the kettle body, that is, close to the stirring shaft, thereby improving the effect of the stirring reaction.

[0016] The present invention uses a scraper with an adjustable rotation angle to gradually scrape off the material attached to the inner wall of the kettle body. This is different from the prior art method of directly scraping off all the attachments on the inner wall of the kettle body. The prior method not only has a large scraping resistance, but also the scraped attachments are prone to form clumps and cannot be quickly dispersed; and the stirred and flowing material continuously impacts the scraping edge of the scraper, thereby achieving impact cleaning of the attachments on the scraping edge of the scraper.

[0017] The present invention guides the scraped attached matter by a scraper serving as a guide spoiler, so that the scraped attached matter is guided to flow toward a side close to a stirring shaft, thereby improving the reaction efficiency.

[0018] The present invention reduces the contact friction area between the scraper and the inner wall of the kettle body by setting the concave-convex distribution positions of the two scraper tooth structures in a staggered shape, while not affecting the effective area of ​​the scraper scraping the material on the inner wall of the kettle body, thereby achieving the effect of reducing wear.

[0019] The present invention arranges the defoaming needles to be distributed in a gradually changing height so that the defoaming needles at various positions can be responsible for the foam elimination work at different height positions, so that the foam at the position far from the stirring shaft is eliminated first, and the foam at the position close to the stirring shaft is eliminated later, so that the foam elimination work is carried out in an orderly manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 What is shown is a schematic diagram of the three-dimensional structure of the reaction kettle of styrene-butadiene latex of the present invention;

[0021] Figure 2 What is shown is a schematic diagram of the three-dimensional structure inside the kettle body of the present invention;

[0022] Figure 3 Shown is a cross-sectional view of the limit ring of the present invention;

[0023] Figure 4 What is shown is a schematic diagram of the combined three-dimensional structure of the electric telescopic member and the second connecting arm of the present invention;

[0024] Figure 5 The state change diagram of the scraper of the present invention is shown, the upper side is the scraping edge of the scraper facing outward, and the lower side is the scraping edge of the scraper facing inward;

[0025] Figure 6Shown is a cross-sectional view of the defoaming needle of the present invention;

[0026] Figure 7 What is shown is a three-dimensional structural schematic diagram of the scraper with a toothed structure of the present invention.

[0027] The reference numbers in the figure are: 1-kettle body, 101-outer tank, 102-inner tank, 2-stirring shaft, 3-connecting ring one, 4-connecting arm one, 401-through hole, 5-scraper, 6-electric telescopic part, 7-connecting arm two, 8-connecting ring two, 9-limiting column, 10-limiting ring, 11-defoaming needle. DETAILED DESCRIPTION

[0028] The technical solution is further described below in conjunction with specific embodiments. It should be noted that the words indicating directions such as up, down, left, and right mentioned in this article are only for the position of the structure shown in the corresponding drawings. The serial numbers of the parts in this article, such as first, second, etc., are only used to distinguish the objects described and do not have any order or technical meaning. The words such as connection and coupling in this application include direct and indirect connection (coupling) unless otherwise specified.

[0029] Example 1

[0030] A reactor for styrene-butadiene latex, such as Figure 1-Figure 7 As shown, it comprises a kettle body 1 and a stirring shaft 2, wherein the stirring shaft 2 is arranged in the kettle body 1, and a driving motor is arranged on the kettle cover of the kettle body 1. The kettle cover and the driving motor thereon are not shown in the drawings, but the structure is well known to those skilled in the art and belongs to common knowledge. The stirring shaft 2 is mounted on the rotating shaft of the driving motor;

[0031] It also includes a connecting ring 1 3, wherein two connecting rings 1 3 are provided, and the two connecting rings 1 3 are vertically distributed and installed on the stirring shaft 2;

[0032] Connecting arm 1 4, the outer ring surface of each connecting ring 1 3 is respectively equipped with two symmetrically distributed connecting arms 1 4;

[0033] The scraper 5 is provided with two scrapers 5, both of which are inclined to the inner wall of the kettle body 1 and are symmetrical about the axis center of the stirring shaft 2, and the two ends of the scraper 5 are respectively installed on one of the connecting arms 4 of the two connecting rings 3.

[0034] The scraping edges of the two scrapers 5 are both configured as tooth-like structures, and the concave-convex distribution of the tooth-like structures of the two scrapers 5 is staggered.

[0035] The scraper 5 is rotatably connected to the connecting arm 4 and a torsion spring for resetting the torsion is connected between the scraper 5 and the connecting arm 4. The outer ring surface of the kettle body 1 is provided with two symmetrically distributed outer grooves 101, and an electric telescopic member 6 is installed in each of the two outer grooves 101. The electric telescopic member 6 is a pneumatic push rod or an electric push rod. The telescopic end of the electric telescopic member 6 penetrates the kettle body 1 and moves in the inner groove 102 opened on the inner wall of the kettle body 1. A sealing ring is provided at the position where the electric telescopic member 6 penetrates the kettle body 1, and each of the telescopic ends of the electric telescopic member 6 is provided with a There are two connecting arms 7, a connecting ring 28 is installed between the two connecting arms 7, the connecting ring 3 located above is rotatably connected to the inner ring surface of the connecting ring 28, the connecting ring 28 is located above the connecting arm 4, an inner spline structure is provided in the connecting ring 3, an outer spline structure is provided on the stirring shaft 2, the connecting ring 3 is connected to the stirring shaft 2 through the spline structure, a limiting column 9 is installed on the upper surface of each of the two scrapers 5, a limiting ring 10 is installed on the inner wall of the kettle body 1, and the lower surface of the limiting ring 10 is an inclined surface with a low inner ring and a high outer ring.

[0036] It should be noted that the length of the limiting column 9 is sufficient so that the connecting arm 2 7 will not touch the limiting ring 10 during the process of the limiting column 9 moving up and down and moving along the inclined surface of the limiting ring 10 .

[0037] It should be noted that the stirring blade structure of the stirring shaft 2 is located between the positions of the two connecting rings 3 and will not affect the lifting and lowering of the two connecting rings 3, which is not shown in the accompanying drawings.

[0038] In the initial state, the scraping edge of the scraper 5 faces outward and contacts the inner wall of the kettle body 1. When the limiting column 9 moves to the highest point along the inclined surface of the limiting ring 10, the scraping edge of the scraper 5 faces inward.

[0039] When the limit column 9 moves to the highest point along the inclined surface of the limit ring 10, the internal spline structure of the connecting ring 3 is disengaged from the external spline structure of the stirring shaft 2. At this time, the scraper 5 is in a state of being impacted and cleaned, and there is no need to perform scraping operations. Therefore, the scraper 5 no longer needs to be driven to rotate. The internal spline structure of the connecting ring 3 is disengaged from the external spline structure of the stirring shaft 2 to stop driving the scraper 5 and reduce energy consumption.

[0040] In this embodiment, the materials required for preparing styrene-butadiene latex are put into the kettle body 1 for reaction, and the materials are stirred by rotating the stirring shaft 2. Since the materials are viscous and will adhere to the inner wall of the kettle body 1 during the reaction, which will affect the temperature conduction efficiency of the kettle body 1 and the full reaction of the materials, the scraper 5 that rotates with the stirring shaft 2 is used to scrape the inner wall of the kettle body 1.

[0041] Furthermore, in the prior art, the scraper 5 for scraping the inner wall of the kettle body 1 is perpendicular to the inner wall of the kettle body 1. When the scraper 5 rotates, it will contact the material in the kettle body 1 and cause a large resistance to rotation. Therefore, the scraper 5 of the present invention is arranged to be inclined to the inner wall of the kettle body 1, which can not only realize the scraping operation on the inner wall of the kettle body 1, but also act as a guiding spoiler. The inclined scraper 5 can disturb the material close to the inner wall of the kettle body 1, and guide this part of the material to flow continuously to the middle of the kettle body 1, that is, close to the stirring shaft 2, thereby improving the effect of the stirring reaction.

[0042] Furthermore, when the material is just put into the kettle, that is, in the initial stage of the reaction, the material is still being stirred near the middle of the kettle body 1, and no adhesion has yet formed on the inner wall of the kettle body 1. At this time, there is no need for the scraper 5 to contact the inner wall of the kettle body 1 to scrape the material. Therefore, in the present invention, the electric telescopic member 6 is controlled to drive the connecting arm 2 7 and the connecting ring 2 8 to rise and fall, thereby driving the connecting ring 1 3, the connecting arm 1 4, the scraper 5, and the limiting column 9 to rise and fall, so that the limiting column 9 moves along the inclined surface of the limiting ring 10. When the limiting column 9 moves upward, the limiting column 9 moves toward the inner wall of the kettle body 1, so that the scraper 5 is driven to rotate, and the scraping edge of the scraper 5 moves away from the inner wall of the kettle body 1. When the limiting column 9 moves downward, since a torsion spring for resetting torsion is connected between the scraper 5 and the connecting arm 4, on the contrary, the scraping edge of the scraper 5 moves toward the inner wall of the kettle body 1, so as to adjust the distance between the scraping edge of the scraper 5 and the inner wall of the kettle body 1 through the telescopic control of the electric telescopic member 6;

[0043] At the beginning of the reaction, the distance between the scraping edge of the scraper 5 and the inner wall of the kettle body 1 is the farthest. The scraper 5, which can act as a guide spoiler, is used to guide the material to reduce the adhesion of the material to the inner wall of the kettle body 1. As the reaction proceeds, the material will still diffuse around and adhere to the inner wall of the kettle body 1. At this time, the scraping edge of the scraper 5 is controlled to gradually approach the inner wall of the kettle body 1, so as to gradually scrape off the material attached to the inner wall of the kettle body 1. This is different from the method in the prior art of directly scraping off all the attachments on the inner wall of the kettle body 1. The existing method not only has a large scraping resistance, but also the scraped attachments are easy to clump and cannot be quickly dispersed.

[0044] Furthermore, since the deposits on the inner wall of the kettle body 1 remain at a position far away from the stirring shaft 2 after being scraped off, affecting the complete reaction of this part of the deposits, the scraped deposits can be guided by the scraper 5 acting as a guide spoiler, so that the scraped deposits are guided to flow to the side close to the stirring shaft 2, thereby improving the efficiency of the reaction.

[0045] Furthermore, since the scraper 5 will be worn when scraping the inner wall of the kettle body 1, the concave-convex distribution positions of the tooth structures of the two scrapers 5 are set to be staggered to reduce the contact friction area between the scraper 5 and the inner wall of the kettle body 1. At the same time, the effective area of ​​the scraper 5 scraping the inner wall of the kettle body 1 is not affected, thereby achieving the effect of reducing wear.

[0046] Furthermore, when the scraper 5 is scraping, the scraped material may adhere to the scraper 5, which may affect the subsequent scraping operation and still cause material adhesion. Therefore, when the limit column 9 moves to the highest point along the inclined surface of the limit ring 10, the scraping edge of the scraper 5 faces inward, that is, Figure 5 As shown in the change from top to bottom state in the figure, at this time, the stirred flowing material continuously impacts the scraping edge of the scraper 5, so as to impact and clean the attachments on the scraping edge of the scraper 5.

[0047] Example 2

[0048] On the basis of Example 1, Figure 1-Figure 6 As shown, twelve defoaming needles 11 are respectively installed on the lower surfaces of the two connecting arms 4 located on the upper connecting ring 3.

[0049] All the defoaming needles 11 on the connecting arm 1 4 are arranged to have lengths that gradually increase from the side close to the stirring shaft 2 to the side away from the stirring shaft 2 .

[0050] The interior of the defoaming needle 11 is configured to be hollow and penetrated from top to bottom. Each of the connecting arms 4 is respectively provided with twelve through holes 401 , and the through holes 401 are communicated with the hollow structure inside the defoaming needle 11 .

[0051] In this embodiment, since foam will be generated when preparing styrene-butadiene latex, in order to reduce the influence of foam on the reaction, a defoaming needle 11 is additionally provided so that when the stirring shaft 2 drives the connecting ring 3 and the connecting arm 4 to rotate, the defoaming needle 11 rotates synchronously to pierce and eliminate the foam.

[0052] Furthermore, the defoaming needles 11 are arranged to have a gradually changing height distribution, so that the defoaming needles 11 at various positions can be responsible for the foam elimination work at different height positions, so that the foam at the position far away from the stirring shaft 2 is eliminated first, and the foam at the position close to the stirring shaft 2 is eliminated later, so that the foam elimination work can be carried out in an orderly manner, avoiding the simultaneous elimination of foam in a large area, causing a large amount of gas to be instantly filled above the kettle body 1, and the large amount of accumulated gas cannot be discharged in time at once, which not only affects the reaction efficiency but also poses a safety hazard.

[0053] Furthermore, the defoaming needle 11 is set to be hollow. When the connecting arm 4 is in the descending process, the defoaming needle 11 will be immersed in the material. The small bubbles under the liquid surface of the material can be eliminated by the defoaming needle 11 immersed in the material. At the same time, the gas in the small bubbles can flow upward along the through hole 401 through the internal space of the defoaming needle 11, so as to prevent small bubbles from forming large bubbles.

[0054] It should be noted that the connecting arm 4 is always located above the liquid surface of the reaction.

[0055] Example 3

[0056] On the basis of Example 2, Figure 1-Figure 4 As shown, the bottom surface of the inner groove 102 is an inclined surface, so that the material can flow downward along the inclined surface to reduce material residue.

[0057] The upper surface of the limiting ring 10 is an arc surface or an inclined surface with a lower inner ring and a higher outer ring, so that the material can flow downward along the arc surface or the inclined surface to reduce material residue.

[0058] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reaction kettle for styrene-butadiene latex, comprising a kettle body (1) and a stirring shaft (2), wherein the stirring shaft (2) is arranged in the kettle body (1), a driving motor is arranged on a kettle cover of the kettle body (1), and the stirring shaft (2) is mounted on a rotating shaft of the driving motor; Its characteristic is that include: A connecting ring (3), wherein two connecting rings (3) are provided, and the two connecting rings (3) are vertically distributed and mounted on the stirring shaft (2); Connecting arm one (4), each of the connecting rings one (3) is respectively provided with two symmetrically distributed connecting arms one (4); A scraper (5), wherein two scrapers (5) are provided, and both scrapers (5) are inclined to the inner wall of the kettle body (1) and are symmetrical about the axis of the stirring shaft (2). The two ends of the scraper (5) are respectively mounted on one of the connecting arms (4) of the two connecting rings (3). The inclined scraper (5) disturbs the material close to the inner wall of the kettle body (1) and guides the material to continuously flow toward the middle of the kettle body (1), that is, close to the stirring shaft (2). The inclined scraper (5) has a smaller movement resistance. The scraper (5) and the connecting arm 1 (4) are rotatably connected and a torsion spring is connected between the scraper (5) and the connecting arm 1 (4). The outer annular surface of the kettle body (1) is provided with two outer grooves (101), and an electric telescopic component (6) is installed in each of the two outer grooves (101). The telescopic end of the electric telescopic component (6) penetrates into the kettle body (1) and moves in an inner groove (102) provided on the inner wall of the kettle body (1). A connecting arm 2 (7) is installed at the telescopic end of each electric telescopic component (6). A connecting ring 2 (8) is installed between the two connecting arms 2 (7). The connecting ring 1 (3) located at the top is rotatably connected to the inner annular surface of the connecting ring 2 (8). The second connecting ring (8) is located above the first connecting arm (4); an internal spline structure is provided in the first connecting ring (3); an external spline structure is provided on the stirring shaft (2); the first connecting ring (3) is connected to the stirring shaft (2) via the spline structure; a limiting column (9) is installed on the upper surface of each of the two scrapers (5); a limiting ring (10) is installed on the inner wall of the kettle body (1); the lower surface of the limiting ring (10) is an inclined surface with a lower inner ring and a higher outer ring; the lifting and lowering of the limiting column (9) is controlled by the telescopic end of the electric telescopic member (6) so that the limiting column (9) moves along the inclined surface of the limiting ring (10), thereby realizing the rotation of the scraper (5) to adjust the angle of the scraper (5); In the initial state, the scraping edge of the scraper (5) faces outward and contacts the inner wall of the kettle body (1); when the limiting column (9) moves along the inclined surface of the limiting ring (10) to the highest point, the scraping edge of the scraper (5) faces inward; When the limiting column (9) moves to the highest point along the inclined surface of the limiting ring (10), the internal spline structure of the connecting ring 1 (3) is disengaged from the external spline structure of the stirring shaft (2).

2. The reactor of styrene-butadiene latex according to claim 1, characterized in that: The scraping edges of the two scrapers (5) are both arranged as tooth-like structures, and the concave-convex distribution of the tooth-like structures of the two scrapers (5) is staggered.

3. The reactor of styrene-butadiene latex according to claim 1, characterized in that: A plurality of defoaming needles (11) are respectively installed on the lower surfaces of the two connecting arms (4) located on the upper connecting ring (3).

4. The reactor of styrene-butadiene latex according to claim 3, characterized in that: All the defoaming needles (11) on the connecting arm 1 (4) are arranged so that their lengths gradually increase from a side close to the stirring shaft (2) to a side away from the stirring shaft (2).

5. The reactor of styrene-butadiene latex according to claim 3, characterized in that: The interior of the defoaming needle (11) is configured to be hollow and penetrated from top to bottom, and each of the connecting arms (4) is provided with a plurality of through holes (401), and the through holes (401) are connected to the hollow structure inside the defoaming needle (11).

6. The reactor of styrene-butadiene latex according to claim 1, characterized in that: The bottom surface of the inner groove (102) is an inclined surface.

7. The reaction kettle of styrene-butadiene latex according to claim 1, characterized in that: The upper surface of the limiting ring (10) is a curved surface or an inclined surface with a lower inner ring and a higher outer ring.

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