Preparation method and preparation system of waterborne polyester

Abstract

The invention discloses a preparation method and a preparation system of water-based polyester, and relates to the technical field of water-based polyester preparation, the preparation method comprises the following steps: S1, under nitrogen protection, adding trimethylolethane and 2, 2-dimethylolbutyric acid into a reaction kettle, and adding p-toluene sulfonic acid for reaction; s2, adding isophthalic acid, maleic anhydride, succinic acid, trimethylolethane, hexanediol and xylene, heating to 140 DEG C, starting stirring, heating to 160 DEG C, keeping the temperature for 0.5 h, heating to 180 DEG C, reacting for 2 h, gradually heating to 240 DEG C, keeping the temperature for 2 h, rapidly cooling to 90 DEG C or below, and adding ethylene glycol monobutyl ether; s3, N, N-dimethylethanolamine is added for a neutralization reaction for 0.5 h, and the waterborne polyester resin is prepared. Through collaborative innovation of a preparation process and an equipment structure, the problems of low stirring efficiency, impurity residues, difficulty in cleaning and the like in the prior art are solved, the production quality and efficiency of the waterborne polyester are remarkably improved, and remarkable economic benefits and environmental protection values are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of waterborne polyester preparation, and particularly relates to a preparation method and a preparation system of waterborne polyester. Background Art

[0002] With the increasingly strict environmental protection requirements, waterborne polyester has been more and more widely used in the fields of coatings, adhesives, etc. due to its characteristics such as low VOC emissions and environmental friendliness. However, in the existing waterborne polyester preparation technology, the traditional stirring mechanism of the reaction kettle mostly adopts a fixed stirring paddle design, which has problems such as limited stirring range, uneven material mixing, and easy formation of stirring dead corners, resulting in low reaction efficiency and insufficient product quality stability. At the same time, some preparation systems lack effective inner wall cleaning devices, and materials are easily attached to the inner wall of the reaction kettle, affecting subsequent production, and no filtering device is provided at the discharge port, and solid impurities may remain in the finished product. Therefore, it is urgent to design a waterborne polyester preparation system with excellent stirring effect, automatic cleaning and filtering functions, and a supporting efficient preparation process to solve the deficiencies in the prior art. Summary of the Invention

[0003] In order to solve the problems mentioned in the above background art, the present invention provides a preparation method and a preparation system of waterborne polyester.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A preparation method of waterborne polyester, comprising the following steps: S1: Under nitrogen protection, add trimethylolethane and 2,2-dimethylolbutyric acid to the reaction kettle (1), heat up to 125 °C, add p-toluenesulfonic acid, react for 5 h, and cool to 40 °C; S2: Add isophthalic acid, maleic anhydride, succinic acid, trimethylolethane, hexanediol and xylene, heat up to 140 °C, start stirring, heat up to 160 °C and keep it constant for 0.5 h, heat up to 180 °C, react for 2 h, then gradually heat up to 240 °C, keep it warm for 2 h, and then quickly cool to below 90 °C, and add ethylene glycol monobutyl ether; S3: Cool down to 70 °C, add N,N-dimethylethanolamine to carry out neutralization reaction for 0.5 h, add deionized water, stir, and vacuum extract xylene under reduced pressure, and filter and package to obtain waterborne polyester resin.

[0005] Preferably, in the step S1, the mass ratio of trimethylolethane, 2,2-dimethylolbutyric acid, and p-toluenesulfonic acid is 500:2000:25.

[0006] Preferably, in the step S2, the mass ratio of isophthalic acid, maleic anhydride, succinic acid, trimethylolethane, hexanediol, xylene, and ethylene glycol monobutyl ether is 150:230:100:30:200:50:200.

[0007] Preferably, in the step S3, the mass ratio of N,N-dimethylethanolamine to deionized water is 120:1250.

[0008] The present invention also provides a preparation system for aqueous polyester, including a reaction kettle. A solid addition port and a liquid addition port are respectively provided at the top end of the reaction kettle, a discharge port is provided at the bottom end of the reaction kettle, and a stirring mechanism is provided inside the reaction kettle; The stirring mechanism includes a power input shaft. The bottom end of the input shaft extends into the interior of the reaction kettle and is fixed with a support housing. The support housing is of a cylindrical structure. A plurality of stirring shafts are installed at the bottom end of the support housing. A driving mechanism is provided inside the support housing, and the driving mechanism drives the stirring shafts to reciprocate radially along the support housing.

[0009] Preferably, an installation frame is fixed at the top end of the reaction kettle. A rotary motor and a motor speed reducer are installed at the top end of the installation frame. The output shaft of the rotary motor is connected to the input end of the motor speed reducer, and the output end of the motor speed reducer is connected to the top end of the power input shaft.

[0010] Preferably, a T-shaped filter is connected to the discharge port through a connecting elbow. A jacket is provided outside the reaction kettle, and a cold and hot medium inlet and a cold and hot medium outlet are respectively provided on both sides of the jacket.

[0011] Preferably, a guide post is fixed to the outside of the input shaft. A disc is installed on the outside of the guide post in a lifting manner. Arc-shaped guide openings corresponding to the number of stirring shafts are formed on the disc. A horizontal slide rail is provided inside the support housing below the disc, and the horizontal slide rail is fixed to the guide post.

[0012] Preferably, there are a plurality of the horizontal slide rails, and the plurality of horizontal slide rails correspond to the plurality of stirring shafts one by one. A slider is slidably installed on the horizontal slide rail. A first limiting rod is fixed to the top end of the slider, and the top end of the first limiting rod passes through the disc through the arc-shaped guide opening.

[0013] Preferably, the horizontal slide rail is fixedly strengthened with the support housing through a fixing frame. A strip-shaped opening is provided at the bottom end of the support housing. The top end of the stirring shaft extends into the interior of the support housing through the strip-shaped opening and is rotatably connected to the bottom end of the slider.

[0014] Preferably, a first guiding groove is formed in the outer part of the guiding column, a second limiting rod is fixed at the position of the top end of the disc facing the guiding column, one end of the second limiting rod extends into the first guiding groove, a guiding ring is fixed on the inner wall of the top end of the reaction kettle, the guiding ring is located outside the disc, and a second guiding groove is formed in the inner wall of the guiding ring. A lifting ring is rotatably installed on the outer side of the disc, a third limiting rod is fixed on the lifting ring, the third limiting rod extends into the second guiding groove, and the lifting ring is fixed to the lifting guiding ring, and the lifting guiding ring is installed on the outer part of the input shaft in a lifting and moving manner.

[0015] Preferably, a fixing ring is arranged outside the strip-shaped opening at the bottom end of the support shell, a rack is arranged on the inner wall of one side of the fixing ring, and a gear is fixed on the outer part of the stirring shaft, and the gear meshes with the rack.

[0016] Preferably, a plurality of stirrers are equidistantly distributed on the stirring shaft from top to bottom, and the stirrers on each stirring shaft are arranged staggered with each other. A scraper is fixed on one side of the support shell through a connecting frame, and the shape of the scraper matches the inner wall of the reaction kettle.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The stirring mechanism of the preparation system adopts a design of a stirring shaft that can reciprocate radially. When the power input shaft drives the support shell to rotate, the stirring shaft not only revolves with the support shell, but also realizes radial reciprocating movement through the cooperation of the arc-shaped guiding port and the horizontal sliding rail. At the same time, the meshing structure of the gear and the rack makes the stirring shaft rotate self, forming a three-dimensional stirring effect, greatly expanding the stirring range, eliminating dead angles, and accelerating the mixing of materials. The stirrers on each stirring shaft are arranged staggered to avoid interference and enhance the shearing force at the same time, ensuring uniform dispersion of materials.

[0018] 2. The jacket structure outside the reaction kettle realizes precise control of the reaction temperature through the cold and heat medium inlets and outlets. Cooperating with the stepwise heating and rapid cooling technologies in the process steps, the reaction process is effectively controlled, and the uniformity of the polyester molecular weight distribution is improved. The T-shaped filter connected to the discharge port can filter solid impurities in real time, ensure the purity of the finished product, and reduce the subsequent treatment process. 3. The scraper on the side of the support shell rotates synchronously with the stirring mechanism, continuously scrapes the inner wall of the reaction kettle, prevents material adhesion and scaling, reduces the manual cleaning cost, and improves the continuous operation ability of the equipment. In addition, the stirring mechanism realizes the reciprocating movement of the stirring shaft by the cooperation of the guiding ring and the lifting ring, using the rotational kinetic energy of the input shaft, without an additional driving device, and has the advantages of energy saving and intelligence. 4. The preparation method adopts a segmented esterification reaction under nitrogen protection, strictly controls the temperature and reaction time at each stage, and cooperates with the addition of ethylene glycol monobutyl ether to effectively adjust the hydrophilic-lipophilic balance of the resin. The prepared waterborne polyester resin has excellent water solubility, film-forming properties and weather resistance, and the solid content is stably within a reasonable range, meeting the application requirements of high-end coatings and adhesives.

[0019] In summary, through the collaborative innovation of the preparation process and equipment structure, the present invention solves the problems of low stirring efficiency, impurity residue, and difficult cleaning in the prior art, significantly improves the production quality and efficiency of waterborne polyester, and has significant economic benefits and environmental protection value. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is the front view of the reaction kettle of the present invention; Figure 2 It is the perspective view of the reaction kettle of the present invention; Figure 3 It is the front perspective sectional view of the reaction kettle of the present invention; Figure 4 It is the perspective sectional view of the reaction kettle of the present invention; Figure 5 It is the top view of the support shell of the present invention; Figure 6 It is the perspective view of the support shell of the present invention; Figure 7 It is the top view of the internal horizontal slide rail of the support shell of the present invention; Figure 8 It is the first perspective view of the internal components of the reaction kettle of the present invention; Figure 9 is Figure 8 the enlarged detail view of position A in Figure 10 It is the second perspective view of the internal components of the reaction kettle of the present invention; Figure 11 It is the bottom view of the support shell of the present invention; Figure 12 It is the sectional view of the guide ring of the present invention; Figure 13 It is the front perspective sectional view of the cooperation relationship between the guide ring and the disc of the present invention; Figure 14Stereoscopic sectional view of the mating relationship between the guiding ring and the disc of the present invention; In the figure: 1, reaction kettle; 101, solid addition port; 102, liquid addition port; 103, discharge port; 1031, connecting elbow; 1032, T-shaped filter; 104, mounting rack; 105, input shaft; 2, jacket; 201, hot and cold medium inlet; 202, hot and cold medium outlet; 3, motor reducer; 301, rotating motor; 4, support housing; 401, stirring shaft; 402, stirrer; 403, strip-shaped opening; 404, fixed ring; 4041, rack; 405, gear; 5, connecting frame; 501, scraper; 6, guiding ring; 601, second guiding groove; 7, disc; 701, arc-shaped guiding port; 702, third limiting rod; 703, second limiting rod; 704, lifting ring; 705, lifting guiding ring; 8, guiding column; 801, horizontal sliding rail; 802, fixing frame; 803, slider; 8031, first limiting rod; 804, first guiding groove. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0023] A preparation method of aqueous polyester includes the following steps: S1: Under nitrogen protection, add 500 parts of trimethylolethane and 2000 parts of 2,2-dimethylolbutyric acid into the reaction kettle 1, heat up to 125 °C, add 25 parts of p-toluenesulfonic acid, react for 5 h, and cool to 40 °C; S2: Add 150 parts of isophthalic acid, 230 parts of maleic anhydride, 100 parts of succinic acid, 30 parts of trimethylolethane, 200 parts of hexanediol and 50 parts of xylene, heat up to 140 °C, start stirring, heat up to 160 °C and keep it constant for 0.5 h, heat up to 180 °C, react for 2 h, then gradually heat up to 240 °C, keep warm for 2 h, and then quickly cool to below 90 °C, and add 200 parts of ethylene glycol monobutyl ether; S3: Cool down to 70 °C, add 120 parts of N,N-dimethylethanolamine to neutralize the reaction for 0.5 h, add 1250 parts of deionized water, stir, and vacuum extract xylene under reduced pressure, and filter and package to obtain the aqueous polyester resin. Embodiment 2

[0024] Refer to Figures 1-14, A preparation system for a water-based polyester, including a reaction kettle 1. The top of the reaction kettle 1 is respectively provided with a solid addition port 101 and a liquid addition port 102. The bottom of the reaction kettle 1 is provided with a discharge port 103. A stirring mechanism is arranged inside the reaction kettle 1; The stirring mechanism includes a power input shaft 105. The bottom end of the input shaft 105 extends into the reaction kettle 1 and is fixed with a support housing 4. The support housing 4 is of a cylindrical structure. A plurality of stirring shafts 401 are installed at the bottom end of the support housing 4. A driving mechanism is arranged inside the support housing 4, and the driving mechanism drives the stirring shafts 401 to reciprocate radially along the support housing 4; When the power input shaft 105 rotates, it drives the entire support housing 4 to rotate, thereby driving a plurality of stirring shafts 401 to rotate along with it to stir the materials. During the stirring process, the driving mechanism drives the stirring shafts 401 to reciprocate radially along the support housing 4, thereby continuously changing the positions of the stirring shafts 401, increasing the stirring range, reducing the stirring dead angle, thereby accelerating the mixing of the materials and increasing the reaction rate.

[0025] Among them, an installation frame 104 is fixed at the top of the reaction kettle 1. A rotary motor 301 and a motor speed reducer 3 are installed at the top of the installation frame 104. The output shaft of the rotary motor 301 is connected to the input end of the motor speed reducer 3, and the output end of the motor speed reducer 3 is connected to the top end of the power input shaft 105; When the rotary motor 301 is started, through the speed reduction effect of the motor speed reducer 3, the power input shaft 105 can be driven to rotate at a relatively slow speed and the torque can be increased.

[0026] Among them, a T-shaped filter 1032 is connected to the discharge port 103 through a connecting elbow 1031. A jacket 2 is arranged outside the reaction kettle 1. A cold and hot medium inlet 201 and a cold and hot medium outlet 202 are respectively arranged on both sides of the jacket 2. After the reaction is completed, when the water-based polyester resin emulsion is discharged, it is first filtered through the T-shaped filter 1032 to filter out solid impurities, and then transported to a packaging machine for packaging. Example 3

[0027] Refer to Figures 1-14 , The difference between this example and Example 2 is that a guide post 8 is fixed outside the input shaft 105. A disc 7 is installed on the outside of the guide post 8 in a lifting manner. An arc-shaped guide port 701 corresponding to the number of stirring shafts 401 is opened on the disc 7. A horizontal slide rail 801 is arranged inside the support housing 4 below the disc 7. The horizontal slide rail 801 is fixed to the guide post 8. There are a plurality of horizontal slide rails 801, and the plurality of horizontal slide rails 801 correspond to the plurality of stirring shafts 401 one by one. A slider 803 is slidably installed on the horizontal slide rail 801. A first limiting rod 8031 is fixed to the top end of the slider 803, and the top end of the first limiting rod 8031 passes through the disc 7 through the arc-shaped guide port 701; When the disc 7 rotates relative to the support housing 4, since the top end of the first limiting rod 8031 passes through the disc 7 through the arc-shaped guiding opening 701, the limiting and guiding effect of the arc-shaped guiding opening 701 on the first limiting rod 8031 will drive the slider 803 to move horizontally along the horizontal sliding rail 801. As long as the disc 7 swings back and forth relative to the support housing 4, the slider 803 can be driven to move horizontally back and forth along the horizontal sliding rail 801. Embodiment 4

[0028] Refer to Figures 1-14 , the difference between this embodiment and Embodiment 3 is that the horizontal sliding rail 801 is fixedly strengthened with the support housing 4 through the fixing frame 802. A strip-shaped opening 403 is provided at the bottom end of the support housing 4. The top end of the stirring shaft 401 extends into the interior of the support housing 4 through the strip-shaped opening 403 and is rotatably connected to the bottom end of the slider 803. A first guiding groove 804 is formed on the outer side of the guiding column 8. A second limiting rod 703 is fixed at the position of the top end of the disc 7 facing the guiding column 8. One end of the second limiting rod 703 extends into the first guiding groove 804. A guiding ring 6 is fixed on the inner wall of the top end of the reaction kettle 1. The guiding ring 6 is located outside the disc 7, and a second guiding groove 601 is formed on the inner wall of the guiding ring 6. A lifting ring 704 is rotatably installed on the outer side of the disc 7. A third limiting rod 702 is fixed on the lifting ring 704. The third limiting rod 702 extends into the second guiding groove 601, and the lifting ring 704 is fixed to the lifting and guiding ring 705. The lifting and guiding ring 705 is installed on the outer side of the input shaft 105 in a lifting and moving manner; When the support housing 4 rotates continuously, since the guiding ring 6 is fixed to the reaction kettle 1 and the lowering guiding ring 705 is installed on the outer side of the input shaft 105 in a lifting and moving manner, the lifting ring 704 will rotate following the input shaft 105. As a result, the third limiting rod 702 moves in the second guiding groove 601. The guiding of the second guiding groove 601 can drive the lifting ring 704 to move up and down reciprocally, and then drive the disc 7 to move up and down reciprocally. When the disc 7 moves up and down reciprocally, since one end of the second limiting rod 703 extends into the first guiding groove 804, the disc 7 will swing back and forth relative to the guiding column 8. Then, the disc 7 is driven to swing back and forth relative to the support housing 4 in a linked manner, and then the slider 803 is driven to move horizontally back and forth along the horizontal sliding rail 801, without the need for an additional installation of a driving device.

[0029] Wherein, a fixing ring 404 is provided outside the strip-shaped opening 403 at the bottom end of the support housing 4. A rack 4041 is provided on one inner wall of the fixing ring 404. A gear 405 is fixed on the outer side of the stirring shaft 401. The gear 405 meshes with the rack 4041; When the slider 803 reciprocates horizontally along the horizontal slide rail 801, since the gear 405 meshes with the rack 4041, it can drive the stirring shaft 401 to rotate self - sufficiently. A plurality of stirrers 402 are equidistantly distributed on the stirring shaft 401 from top to bottom, and the stirrers 402 on each stirring shaft 401 are staggered with each other. While the stirring shaft 401 can follow the revolution, it can also reciprocate horizontally and rotate reciprocally, which can greatly improve the stirring effect. The staggered stirrers 402 can ensure that there is no interference between them.

[0030] One side of the support shell 4 is fixed with a scraper 501 through a connecting frame 5. The shape of the scraper 501 matches the inner wall of the reaction kettle 1, and the scraper 501 can follow the rotation of the support shell 4 to scrape the inner wall of the reaction kettle 1.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0032] In the present invention, unless otherwise clearly specified and defined, the terms "set", "install", "connect", "link", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present invention can be understood according to specific situations.

[0033] The control mode of the present invention is automatically controlled by a controller. The control circuit of the controller can be realized by simple programming by those skilled in the art. The provision of power also belongs to the common knowledge in the art, and the present invention mainly aims to protect mechanical devices, so the control mode and circuit connection of the present invention will not be explained in detail.

[0034] The above - mentioned is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A preparation method of an aqueous polyester, characterized in that It includes the following steps: S1: Under nitrogen protection, trimethylolethane and 2,2-dimethylolbutyric acid are added into the reaction kettle (1), heated to 125 °C, p-toluenesulfonic acid is added, and the reaction is carried out for 5 h, then cooled to 40 °C; S2: Isophthalic acid, maleic anhydride, succinic acid, trimethylolethane, hexanediol and xylene are added, heated to 140 °C, stirring is started, heated to 160 °C and kept at a constant temperature for 0.5 h, then heated to 180 °C, and the reaction is carried out for 2 h. Then it is gradually heated to 240 °C, kept warm for 2 h, and then quickly cooled to below 90 °C, and ethylene glycol monobutyl ether is added; S3: Cool down to 70 °C, add N,N-dimethylethanolamine to neutralize the reaction for 0.5 h, add deionized water, stir, and vacuum extract xylene under reduced pressure, and then filter and package to obtain the waterborne polyester resin.

2. The preparation method of an aqueous polyester according to claim 1, characterized in that, In the step S1, the mass ratio of trimethylolethane, 2,2-dimethylolbutyric acid, and p-toluenesulfonic acid is 500:2000:

25.

3. The preparation method of an aqueous polyester according to claim 1, wherein In the step S2, the mass ratio of isophthalic acid, maleic anhydride, succinic acid, trimethylolethane, hexanediol, xylene, and ethylene glycol monobutyl ether is 150:230:100:30:200:50:

200.

4. The preparation method of an aqueous polyester according to claim 1, wherein In the step S3, the mass ratio of N,N-dimethylethanolamine to deionized water is 120:1250.

5. A preparation system for aqueous polyester, which is applied to the preparation method of an aqueous polyester as described in claim 1, comprising a reaction kettle (1), and is characterized in that: The top of the reaction kettle (1) is respectively provided with a solid addition port (101) and a liquid addition port (102), the bottom end of the reaction kettle (1) is provided with a discharge port (103), and a stirring mechanism is arranged inside the reaction kettle (1); The stirring mechanism includes a power input shaft (105), the bottom end of the input shaft (105) extends into the interior of the reaction kettle (1) and is fixed with a support housing (4). The support housing (4) is of a cylindrical structure, and a plurality of stirring shafts (401) are installed at the bottom end of the support housing (4). A driving mechanism is arranged inside the support housing (4), and the driving mechanism drives the stirring shafts (401) to reciprocate radially along the support housing (4).

6. The preparation system of an aqueous polyester according to claim 5, characterized in that: An installation frame (104) is fixed at the top of the reaction kettle (1), a rotary motor (301) and a motor speed reducer (3) are installed at the top of the installation frame (104), the output shaft of the rotary motor (301) is connected to the input end of the motor speed reducer (3), and the output end of the motor speed reducer (3) is connected to the top end of the power input shaft (105).

7. The preparation system of an aqueous polyester according to claim 5, characterized in that: A T-shaped filter (1032) is connected to the discharge port (103) through a connecting elbow (1031). A jacket (2) is arranged outside the reaction kettle (1), and a cold and hot medium inlet (201) and a cold and hot medium outlet (202) are respectively arranged on both sides of the jacket (2).

8. The preparation system of an aqueous polyester according to claim 5, characterized in that: A guide post (8) is fixed outside the input shaft (105), a disc (7) is installed on the guide post (8) in a lifting manner, arc-shaped guide openings (701) corresponding to the number of the stirring shafts (401) are formed on the disc (7), and a horizontal slide rail (801) is arranged inside the support housing (4) below the disc (7), and the horizontal slide rail (801) is fixed to the guide post (8).

9. The preparation system of an aqueous polyester according to claim 8, characterized in that: A plurality of the horizontal slide rails (801) are provided, and the plurality of horizontal slide rails (801) correspond to the plurality of stirring shafts (401) one by one. A slider (803) is slidably mounted on the horizontal slide rail (801). A first limiting rod (8031) is fixed to the top end of the slider (803), and the top end of the first limiting rod (8031) passes through the disc (7) through the arc-shaped guiding opening (701).

10. The preparation system of an aqueous polyester according to claim 9, characterized in that: The horizontal slide rail (801) is fixedly strengthened with the support housing (4) through a fixing frame (802). A strip-shaped opening (403) is provided at the bottom end of the support housing (4). The top end of the stirring shaft (401) extends into the interior of the support housing (4) through the strip-shaped opening (403) and is rotatably connected to the bottom end of the slider (803).

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