Preparation system of spinning solution

Abstract

The invention discloses a preparation system of a spinning solution, and belongs to the technical field of spinning solution preparation. The problem that an existing spinning solution preparation system cannot prepare high-molecular-weight polymers is solved. The device comprises a blending tank, a prepolymerization device, a first neutralization device, a first filter, a polymerization device, a second neutralization device and a crude spinning solution storage tank which are connected in sequence. The pre-polymerization device and the polymerization device are arranged to realize two-time polymerization, the first neutralization device and the second neutralization device are arranged to respectively realize neutralization after two-time polymerization, and a high molecular weight polymer solution which is stable in performance and is used for spinning is obtained through two-time polymerization and two-time neutralization.

Description

Technical Field

[0001] The invention relates to the technical field of spinning solution preparation, and in particular to a spinning solution preparation system. Background Art

[0002] Spinning liquid is the raw material liquid used to make fibers in chemical fiber production. It is a solution or suspension formed by polymers in appropriate solvents. The preparation and adjustment of spinning liquid is a key step in the fiber production process.

[0003] The existing spinning solution preparation system only includes a polymerization reaction device and a neutralization reaction device, which can only prepare low molecular weight polymers and cannot prepare polymers with a molecular weight of 10 4 -10 6 The high molecular weight polymer or the prepared high molecular weight polymer is of low quality. Summary of the invention

[0004] In view of the above analysis, the present invention aims to provide a spinning solution preparation system to solve the problem that the existing spinning solution preparation system cannot prepare high molecular weight polymers.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] The invention provides a spinning solution preparation system, comprising a mixing tank, a prepolymerization device, a first neutralization device, a first filter, a polymerization device, a second neutralization device and a crude spinning solution storage tank which are connected in sequence.

[0007] Furthermore, it also includes a first raw material tank connected to the prepolymerization device and the polymerization device respectively.

[0008] Further, it also includes a metering pump;

[0009] Metering pumps are arranged on the pipeline connecting the first raw material tank and the polymerization device and on the pipeline connecting the first raw material tank and the polymerization device.

[0010] Furthermore, it also includes a viscosity detector arranged between the polymerization device and the second neutralization device.

[0011] Further, a buffer is included;

[0012] The first neutralization device, the buffer, the first filter and the polymerization device are connected in sequence.

[0013] Furthermore, it also includes a second filter, a degassing device and a finished spinning solution storage tank which are connected in sequence;

[0014] The inlet of the second filter is connected to the crude spinning solution storage tank.

[0015] Furthermore, the degassing device comprises a vacuum centrifugal degassing device.

[0016] Further, the vacuum centrifugal degassing device comprises a tank body having a cavity, a centrifugal assembly arranged in the cavity, and a driving assembly arranged outside the tank body;

[0017] The drive assembly is connected to the centrifugal assembly.

[0018] Furthermore, the degassing device also includes a vacuum machine arranged outside the tank body.

[0019] Furthermore, the degassing device also includes a vacuum gauge connected to the tank body.

[0020] Furthermore, the centrifugal assembly includes a centrifugal cylinder, a connecting support arm, an umbrella-shaped dispersion plate and a support column connected in sequence from the outside to the inside;

[0021] The centrifugal cylinder comprises a top truncated cone cylinder section, a straight cylinder section and a reduced diameter section which are sequentially connected from top to bottom; the umbrella-shaped dispersion plate is connected to the inner wall of the straight cylinder section through a connecting support arm, and a spacing is arranged between the umbrella-shaped dispersion plate and the straight cylinder section;

[0022] The centrifugal assembly also includes a fluid limiting unit arranged below the umbrella-shaped dispersion plate, and the fluid limiting unit includes an annular limiting plate, a connecting rod, a connecting sleeve, an anti-retraction piece and a threaded locking piece connected in sequence; wherein the annular limiting plate, the connecting rod and the connecting sleeve are arranged in sequence from the outside to the inside; the connecting sleeve, the anti-retraction piece and the threaded locking piece are sequentially sleeved on the outer wall of the support column, and the connecting sleeve and the threaded locking piece are respectively threadedly connected to the outer wall of the support column, and the threaded locking piece and the connecting sleeve move axially along the support column, thereby driving the annular limiting plate to perform linear reciprocating motion along the axial direction of the support column.

[0023] Furthermore, the outer edge of the annular limit plate includes an inclined section arranged obliquely downward, and a limit block is arranged on the inner wall of the straight tube section opposite to the inclined section. The limit block includes an annular structure arranged around the inner wall of the straight tube section, and the annular structure is an annular structure with a triangular cross-section. The plane where the inclined section is located is parallel to the first side wall of the annular structure closest to the inclined section.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] 1. In the present invention, two polymerizations are achieved by setting a prepolymerization device and a polymerization device, and neutralization after the two polymerizations is achieved by setting a first neutralization device and a second neutralization device, respectively. A high molecular weight polymer solution with stable performance and used for spinning is obtained through two polymerizations and two neutralizations.

[0026] 2. In the present invention, the raw material is polymerized for the first time through a prepolymerization device, and the obtained prepolymer is neutralized with ammonia through a first neutralization device, and then the particles in the mixed liquid after the first neutralization are removed through a first filter to obtain a clarified prepolymer, which lays the foundation for the preparation of a high molecular weight polymer; the clarified prepolymer is polymerized for the second time in a polymerization device to obtain a polymer, and the polymer is neutralized for the second time through a second neutralization device to obtain a polymer solution with stable performance, and is input into a crude spinning solution storage tank, and a high molecular weight polymer solution with stable performance and used for spinning is obtained through two polymerizations and two neutralizations.

[0027] 3. By combining vacuum technology and centrifugal technology, the degassing device of the present invention can achieve rapid removal of bubbles in the gas-liquid mixed fluid, ensuring the quality and stability of the material during the degassing process.

[0028] 4. The present invention blocks and / or controls the amount of fluid entering the inner wall of the straight tube section in the centrifuge cylinder through the fluid restriction unit, thereby controlling the centrifugal time of the fluid on the straight tube section and the film thickness on the inner wall of the straight tube section, thereby facilitating the escape of bubbles and achieving the purpose of completely escaping the bubbles, thereby improving the quality of the finished spinning solution for spinning.

[0029] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0031] Figure 1 It is a structural schematic diagram of a spinning solution preparation system in the present invention;

[0032] Figure 2 It is a schematic diagram of the spinning solution preparation process in the present invention;

[0033] Figure 3 It is a structural schematic diagram of a degassing device;

[0034] Figure 4 It is a schematic diagram of the structure after the centrifugal cylinder, the connecting support arm and the umbrella-shaped dispersion plate are connected;

[0035] Figure 5 Schematic diagram of the structure of the fluid restriction unit.

[0036] Reference numerals:

[0037] 1-preparation tank, 2-prepolymerization device, 3-first neutralization device, 4-first filter, 5-polymerization device, 6-second neutralization device, 7-crude spinning solution storage tank, 8-first raw material tank, 9-metering pump, 10-viscosity detector, 11-second filter, 12-degassing device, 13-finished spinning solution storage tank, 14-buffer;

[0038] 91-a first metering pump, 92-a second metering pump;

[0039] 121-tank body, 122-centrifugal assembly, 123-driving assembly;

[0040] 1211- cavity, 1212 feed port;

[0041] 1221-centrifuge cylinder, 1222-connecting support arm, 1223-umbrella-shaped dispersion plate, 1224-support column, 1225-fluid restriction unit;

[0042] a-top frustum cylinder section, b-straight cylinder section, c-reduced diameter section;

[0043] b1-limiting block;

[0044] A-annular limiting plate, B-connecting rod, C-connecting sleeve, D-anti-retraction part, E-thread locking part;

[0045] A1-oblique segment;

[0046] 1231-rotating shaft, 1232-magnetic drive unit. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0048] Example

[0049] A specific embodiment of the present invention discloses a system for preparing a spinning solution, such as Figure 1 and Figure 2 As shown, it includes a preparation tank 1, a prepolymerization device 2, a first neutralization device 3, a first filter 4, a polymerization device 5, a second neutralization device 6 and a crude spinning solution storage tank 7 which are connected in sequence.

[0050] In this embodiment, the polymer raw material completes the first polymerization, i.e., prepolymerization, through the prepolymerization device 2, and the obtained prepolymer is neutralized with ammonia through the first neutralization device 3, and then the particles in the mixed liquid after the first neutralization are removed through the first filter 4 to obtain a clarified prepolymer, laying the foundation for the preparation of a high molecular weight polymer; the clarified prepolymer completes the second polymerization in the polymerization device 5 to obtain a polymer, and the polymer is completed by the second neutralization device 6. The second neutralization obtains a polymer solution with stable performance and is input into the crude spinning solution storage tank 7.

[0051] Furthermore, the preparation system of this embodiment further comprises a first raw material tank 8 connected to the prepolymerization device 2 and the polymerization device 5, respectively. Figure 1 and Figure 2 As shown, the first raw material tank 8 is used to store isophthaloyl chloride.

[0052] In this embodiment, isophthaloyl chloride is added in a preset amount in both polymerization reactions to obtain high molecular weight polymer solutions. Specifically, isophthaloyl chloride is added in a preset amount to the prepolymerization device 2 for prepolymerization to obtain a prepolymer, and phthaloyl chloride is also added in a preset amount to the polymerization device 5 for polymerization to obtain a polymer.

[0053] Furthermore, considering the control of the amount of the raw material in the first raw material tank 8 added to the prepolymerization device 2 and the polymerization device 5, the preparation system of this embodiment further includes a metering pump 9, such as Figure 1 and Figure 2 As shown; metering pumps 9 are respectively arranged on the pipeline connecting the first raw material tank 8 and the prepolymerization device 2, and on the pipeline connecting the first raw material tank 8 and the polymerization device 5. Specifically, a first metering pump 91 is arranged on the pipeline connecting the first raw material tank 8 and the prepolymerization device 2, and the amount of isophthaloyl chloride input into the prepolymerization device 2 is controlled by the first metering pump 91; second metering pumps 92 are respectively arranged on the pipeline connecting the first raw material tank 8 and the polymerization device 5, and the amount of isophthaloyl chloride input into the polymerization device 5 is controlled by the second metering pump 92.

[0054] Furthermore, in consideration of determining the endpoint of the polymerization reaction in the polymerization device 5 and fine-tuning the viscosity of the polymerization product, the preparation system of this embodiment further includes a viscosity detector 10 disposed between the polymerization device 5 and the second neutralization device 6, such as Figure 2 shown.

[0055] Furthermore, in order to reduce the input buffer and output buffer of the first filter 4, the preparation system of this embodiment further includes a buffer 14, such as Figure 1 and Figure 2 As shown, the first neutralization device 3, the buffer 14, the first filter 4 and the polymerization device 5 are connected in sequence.

[0056] Furthermore, considering that the polymer solution used for spinning needs to be filtered and degassed to improve the spinning quality, the preparation system of this embodiment also includes a second filter 11, a degassing device 12 and a finished spinning solution storage tank 13, such as Figure 1 and Figure 2 As shown; the outlet end of the crude spinning solution storage tank 7, the second filter 11, the degassing device 12 and the finished spinning solution storage tank 13 are connected in sequence.

[0057] Furthermore, in this embodiment, the degassing device 12 includes a vacuum centrifugal degassing device to achieve degassing of the solution to be degassed under vacuum conditions. The degassing device 12 promotes the rapid removal of bubbles in the gas-liquid mixed fluid by combining vacuum technology and centrifugal technology structures, thereby ensuring the quality and stability of the material during the degassing process.

[0058] In this embodiment, the degassing device 12 includes a tank body 121 having a cavity 1211, a centrifugal assembly 122 arranged in the cavity 1211, and a driving assembly 123 arranged outside the tank body 121; the driving assembly 123 is connected to the centrifugal assembly 122, such as Figure 3 shown.

[0059] Considering that the cavity 1211 needs to be in a vacuum environment during operation, the degassing device 12 further includes a vacuum machine arranged outside the tank body 121. Considering the real-time monitoring of the vacuum degree in the cavity 1211, a vacuum gauge connected to the tank body 121 is also included.

[0060] In this embodiment, the tank body 121 includes a feed port 1212, a vacuum port and a discharge port. The feed port 1212 is connected to a feed pipe. The vacuum port is connected to a vacuum machine. The discharge port is connected to the finished spinning solution storage tank 13. The cavity 1211 includes an upper centrifugal zone and a lower pure liquid fluid collection zone, such as Figure 3 shown.

[0061] In this embodiment, the centrifugal assembly 122 includes a centrifugal cylinder 1221, a connecting support arm 1222, an umbrella-shaped dispersion plate 1223 and a support column 1224, which are connected in sequence from the outside to the inside. Figure 3 As shown, the feed pipe guides the gas-liquid mixed fluid to the umbrella-shaped dispersion plate 1223. Through rotation, the umbrella-shaped dispersion plate 1223 throws the gas-liquid mixed fluid onto the inner wall of the centrifugal cylinder 1221. The gas-liquid mixed fluid moves downward in a spiral on the inner wall of the centrifugal cylinder 1221, and centrifugal degassing is achieved during the movement. The driving component 123 is connected to the support column 1224, and drives the support column 1224 to rotate the centrifugal cylinder 1221 through the umbrella-shaped dispersion plate 1223 and the connecting support arm 1222. The centrifugal cylinder 1221 includes a top truncated cone cylinder section a, a straight cylinder section b, and a reduced diameter section c, which are sequentially connected from top to bottom, as shown in FIG. Figure 4As shown, the umbrella-shaped dispersion plate 1223 is connected to the inner wall of the straight cylinder section b through the connecting support arm 1222, and a distance is set between the umbrella-shaped dispersion plate 1223 and the straight cylinder section b, which is conducive to the fluid to rotate downward on the straight cylinder section b. The upper opening diameter of the top truncated cone cylinder section a, the outer edge diameter of the umbrella-shaped dispersion plate 1223, and the lower opening diameter of the top truncated cone cylinder section a are increased in sequence, and the lower opening diameter of the top truncated cone cylinder section a is equal to the diameter of the straight cylinder section b. The top truncated cone cylinder section a is located above the umbrella-shaped dispersion plate 1223 to prevent the gas-liquid mixed fluid on the umbrella-shaped dispersion plate 1223 from splashing from above the umbrella-shaped dispersion plate 1223 and directly falling into the pure liquid fluid collection area during the rotation of the umbrella-shaped dispersion plate 1223. The liquid outlet of the feed pipe is located between the upper opening of the top conical cylinder section a and the umbrella-shaped dispersion plate 1223, and a distance is set between the feed pipe and the upper opening of the top conical cylinder section a, and this distance serves as the first channel for gas to be removed from the centrifugal assembly 122, providing a channel for bubbles to escape from the centrifugal assembly 122 during the rotation of the umbrella-shaped dispersion plate 1223, and the lower opening of the reduced diameter section c serves as the second channel for gas to be removed from the centrifugal assembly 122, providing a channel for bubbles to escape from the centrifugal assembly 122 during the rotating centrifugal process.

[0062] The fluid entering the degassing device 12 includes a gas-liquid mixed fluid containing a liquid fluid and a gaseous fluid. During the rotation process, the liquid fluid and the gaseous fluid are both subjected to two forces. The first force is the buoyancy toward the rotation axis of the support column 1224 under a vacuum state. The second force is the centrifugal force that is directed away from the axis of rotation. Because the density of gas is much smaller than that of liquid, the mass of gas is much smaller than that of liquid in the same volume, that is, the centrifugal force is proportional to the mass of the substance, and the centrifugal force on the liquid with a large mass is greater than the centrifugal force on the gas with a small mass. Under vacuum, the buoyancy of the liquid fluid and the gaseous fluid in the radial direction of the centrifuge cylinder 1221 and toward the rotation axis of the centrifuge cylinder 1221 is the same, the centrifugal force of the gas is smaller, and the resultant force it receives is larger, while the centrifugal force of the liquid is larger, and the resultant force it receives is smaller; during the rotation process, the gas moves rapidly toward the direction of the rotation axis of the centrifuge cylinder 1221, and then escapes from the liquid fluid, realizing the escape of bubbles in the liquid fluid.

[0063] Furthermore, the outer edge of the umbrella-shaped dispersion plate 1223 is connected to the straight tube section b, and a gap is set between the outer edge of the umbrella-shaped dispersion plate 1223 and the inner wall of the straight tube section b, such as Figure 4 As shown, the fluid is thrown to the inner wall of the straight tube section b and moves spirally downward along the straight tube section b.

[0064] Furthermore, a gap is provided between two adjacent connecting support arms 1222 to reduce the load on the support column 1224 .

[0065] Furthermore, the centrifugal assembly 122 also includes a fluid restriction unit 1225 disposed below the umbrella-shaped dispersion plate 1223, such as Figure 3 and Figure 5 As shown, the fluid limiting unit 1225 includes an annular limit plate A, a connecting rod B, a connecting sleeve C, an anti-retraction part D and a threaded locking part E which are connected in sequence; wherein the annular limit plate A, the connecting rod B and the connecting sleeve C are arranged in sequence from the outside to the inside; the connecting sleeve C, the anti-retraction part D and the threaded locking part E are sequentially sleeved on the outer wall of the support column 1224, and the connecting sleeve C and the threaded locking part E are respectively threadedly connected to the outer wall of the support column 1224, and the threaded locking part E and the connecting sleeve C move axially along the support column 1224, driving the annular limit plate A to perform linear reciprocating motion along the axial direction of the support column 1224, so as to achieve the purpose of adjusting the axial position of the annular limit plate A on the support column 1224; the anti-retraction part D is used to achieve the relative stillness of the connecting sleeve C, the threaded locking part E and the support column 1224 after the three are connected and locked, so as to avoid displacement during rotation. In the radial direction of the centrifugal barrel 1221, the outer edge of the annular limit plate A is located between the straight tube section b and the reduced diameter section c, the inner edge of the annular limit plate A is located between the outer edge of the umbrella-shaped disperser plate 1223 and the support column 1224, and gaps are set between the annular limit plate A and the straight tube section b, between the annular limit plate A and the support column 1224, between the annular limit plate A and the umbrella-shaped disperser plate 1223, and between the annular limit plate A and the support column 1224.

[0066] In this embodiment, by controlling the annular limit plate A to make linear reciprocating motion along the axial direction of the support column 1224, and then controlling the distance between the annular limit plate A closest to the umbrella-shaped disperser plate 1223 and the umbrella-shaped disperser plate 1223, the amount of fluid thrown from the umbrella-shaped disperser plate 1223 to the straight tube section b is controlled, so as to achieve the control of the amount of fluid entering the straight tube section b, and then achieve the control of the thickness of the film formed on the straight tube section b, thereby controlling the degassing efficiency and improving the degassing effect.

[0067] In this embodiment, the outer edge of the annular limiting plate A is arranged between the straight tube section b and the reduced diameter section c. Figure 3 As shown, the speed of the spiral downward rotation of the fluid on the straight section b is blocked and reduced, the time the fluid is centrifuged on the straight section b is prolonged, the centrifugal time is increased, and the degassing efficiency is improved.

[0068] In this embodiment, the inner edge of the annular limiting plate A is located between the outer edge of the umbrella-shaped dispersion plate 1223 and the support column 1224, which provides a channel for the centrifugal gas to move out of the centrifugal assembly 122 on the one hand, and reduces the counterweight on the other hand.

[0069] In this embodiment, a plurality of fluid restriction units 1225 are provided, such as Figure 3As shown, the distance between two adjacent fluid restriction units 1225 is adjustable, which is suitable for degassing of gas-liquid mixed fluids with various viscosities and has a wide range of applications.

[0070] Furthermore, the outer edge of the annular limiting plate A includes an inclined section A1 arranged obliquely downward, such as Figure 5 As shown, a limit block b1 is arranged on the inner wall of the straight section b and is arranged opposite to the inclined section A1. Figure 4 As shown, the limit block b1 includes an annular structure arranged around the inner wall of the straight tube section b, the annular structure is an annular structure with a triangular cross section, and the plane where the inclined section A1 is located is parallel to the first side wall of the annular structure closest to the inclined section A1. By controlling the vertical distance between the inclined section A1 and the first side wall, the amount of fluid entering the inner wall of the straight tube section b is controlled, thereby controlling the thickness of the film on the inner wall of the straight tube section b.

[0071] In this embodiment, the outer edge of the inclined section A1 is located between the straight section b and the reduced diameter section c to ensure that during the rotational centrifugation process, the outer edge of the inclined section A1 can extend into the thin film formed on the inner wall of the straight section b, thereby achieving the purpose of blocking the movement of the fluid, thereby extending the time the fluid is centrifuged and improving the degassing efficiency.

[0072] Furthermore, the driving assembly 123 includes a rotating shaft 1231 and a magnetic driving unit 1232. Figure 3 As shown, the rotating shaft 1231 is fixedly connected to the support column 1224, and the magnetic drive unit 1232 is arranged in the groove at the bottom of the tank body 121. The magnetic drive unit 1232 drives the rotating shaft 1231 to rotate through magnetic transmission, and the magnetic transmission drive is adopted to ensure the sealing of the tank body 121. The rotating shaft 1231 drives the centrifugal assembly 122 to rotate as a whole through the support column 1224.

[0073] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A system for preparing a spinning solution, characterized in that: The invention comprises a mixing tank (1), a prepolymerization device (2), a first neutralization device (3), a first filter (4), a polymerization device (5), a second neutralization device (6) and a crude spinning solution storage tank (7) which are connected in sequence.

2. The system for preparing spinning solution according to claim 1, characterized in that: It also includes a first raw material tank (8) connected to the prepolymerization device (2) and the polymerization device (5) respectively.

3. The system for preparing spinning solution according to claim 2, characterized in that: Also includes a metering pump (9); A metering pump (9) is provided on the pipeline connecting the first raw material tank (8) and the polymerization device (2), and on the pipeline connecting the first raw material tank (8) and the polymerization device (5).

4. The system for preparing spinning solution according to claim 1, characterized in that: It also includes a viscosity detector (10) disposed between the polymerization device (5) and the second neutralization device (6).

5. The system for preparing spinning solution according to claim 1, characterized in that: Also includes a buffer (14); The first neutralization device (3), the buffer (14), the first filter (4) and the polymerization device (5) are connected in sequence.

6. The system for preparing spinning solution according to claim 1, characterized in that: It also includes a second filter (11), a degassing device (12) and a finished spinning solution storage tank (13) which are connected in sequence; The inlet of the second filter (11) is connected to the crude spinning solution storage tank (7).

7. The system for preparing spinning solution according to claim 6, characterized in that: The degassing device (12) comprises a vacuum centrifugal degassing device.

8. The system for preparing spinning solution according to claim 7, characterized in that: The vacuum centrifugal degassing device comprises a tank body (121) having a cavity (1211), a centrifugal assembly (122) arranged in the cavity (1211), and a driving assembly (123) arranged outside the tank body (121); The driving assembly (123) is connected to the centrifugal assembly (122).

9. The system for preparing spinning solution according to claim 8, characterized in that: The degassing device (12) further comprises a vacuum machine arranged outside the tank body (121).

10. The system for preparing spinning solution according to claim 8, characterized in that: The degassing device (12) further comprises a vacuum gauge connected to the tank body (121).

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