A continuous prepolymerization equipment and polymerization method for spandex yarn production

Abstract

This invention discloses a continuous prepolymerization device for spandex yarn production, comprising: a first reactor; a second reactor configured below the first reactor; a storage tank configured below the second reactor; a desizing and debubbling device configured between the storage tank and the second reactor; and a connecting pipeline connecting the first reactor, the second reactor, the desizing and debubbling device, and the storage tank. The internal structures of the first reactor, the second reactor, and the storage tank are identical, and the inner walls of the first reactor, the second reactor, and the storage tank are collectively referred to as the inner cavity wall, each equipped with a stirrer and a control device. This invention incorporates materials within the reactors that can circulate during use. The materials circulate during stirring and mixing, enabling rapid internal and external circulation of the materials within the reactors.

Description

Technical Field

[0001] This invention relates to the field of prepolymerization technology, specifically to a continuous prepolymerization equipment and polymerization method for spandex yarn production. Background Technology

[0002] Prepolymerization equipment is used to produce polymer materials such as synthetic fibers, plastics, and rubber. It allows monomers or low-molecular-weight prepolymers to undergo chain extension reactions under specific conditions, forming high-molecular-weight block copolymers or cross-linked polymers. The advantages of prepolymerization equipment include improved reaction efficiency, reduced energy consumption, control over product structure and performance, and reduced environmental pollution.

[0003] Dry prepolymerization equipment: This equipment involves prepolymerizing diisocyanate and diol in a first reactor to generate a prepolymer with a certain NCO content. Then, solvent and chain extender are added to a second reactor to carry out a chain extension reaction, forming a high-molecular-weight block copolymer solution. This equipment is suitable for dry spinning, where the block copolymer solution is spun into fine filaments through a spinneret, and the solvent is removed in hot air, causing the filaments to solidify. Dry spinning is currently the most commonly used method, accounting for over 80% of total spandex production. The advantages of dry prepolymerization equipment are simple process, fewer equipment requirements, low energy consumption, and high product quality.

[0004] Good thermal conductivity and stable mixing effect can ensure stable polymerization in prepolymerization equipment. However, stirring the internal materials with a stirring rod requires a long cycle time for uniform mixing, resulting in poor temperature transfer rate between heating and cooling. When the temperature changes, the temperature of the materials inside the reactor fluctuates greatly, affecting the polymerization quality. Summary of the Invention

[0005] One of the objectives of this invention is to provide a continuous prepolymerization equipment and polymerization method for spandex yarn production. By changing the movement of materials inside the reactor, the material can be rapidly circulated within the reactor, thereby reducing the temperature difference of the materials inside the reactor.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a continuous prepolymerization device for spandex yarn production, comprising:

[0007] First reactor;

[0008] The second reactor is located below the first reactor. A storage tank is located below the second reactor. A degassing and de-bubbling device is located between the storage tank and the second reactor. A connecting pipeline is provided between the first reactor, the second reactor, the degassing and de-bubbling device, and the storage tank to form a connection.

[0009] The internal structures of the first reactor, the second reactor, and the storage tank are identical. The inner walls of the first reactor, the second reactor, and the storage tank are collectively referred to as the inner cavity walls, and all are equipped with agitators and control devices.

[0010] The mixer includes:

[0011] The stirring rod is rotatably disposed inside the first reactor, the second reactor, and the storage tank. The stirring rod extends vertically to the inner wall of the cavity. A guide plate is disposed at the lower part of the stirring frame. The guide plate is inclined in a threaded manner, and a protective plate is disposed at the end of the guide plate away from the inner wall. The protective plate, the guide plate, and the inner wall form a U-shape. A circulation plate is disposed at the upper part of the guide plate. The circulation plate is arc-shaped.

[0012] The adjusting plate is movably installed inside the stirring rod and can rotate and slide relative to the stirring rod.

[0013] In one or more embodiments of the present invention, the aforementioned adjusting plate is disposed on the inner side of the protective plate, the middle part of the adjusting plate is axially shaped, and the inner side of the stirring rod is provided with a sliding sleeve sleeved on the middle part of the adjusting plate, and the stirring rod can rotate and slide relative to the sliding sleeve.

[0014] In one or more embodiments of the present invention, a positioning block is disposed at one end of the adjustment plate near the inner cavity wall, the positioning block extends into the inner cavity wall, and a groove is disposed in the inner cavity wall to restrict the positioning block, the groove being corrugated.

[0015] In one or more embodiments of the present invention, a partition plate is provided on the inner side of the inner cavity wall, the partition plate is fixed on the inner side of the inner cavity wall, and the stirring rod is set in an integer multiple of the partition plate. The upper end of the adjusting plate extends to the inner side of the partition plate, a guide groove is provided on the inner side of the partition plate, and the adjusting plate extends to the inner side of the guide plate.

[0016] In one or more embodiments of the present invention, a cam is provided at the upper end of the adjustment plate. The cam is slidably sleeved on the outside of the adjustment plate and extends into the guide groove. An upwardly extending limiting protrusion is provided at the top of the cam and the limiting protrusion is limited by the guide groove.

[0017] In one or more embodiments of the present invention, the aforementioned limiting protrusion is equipped with a ball bearing, which is rotatably disposed inside the limiting protrusion. The ball bearing contacts the inner wall of the guide groove. The circulation plate is fixed to the outer wall of the partition plate. The inner side of the cam is polygonal, and the upper part of the adjustment plate is adapted to the shape of the inner side of the cam. The cam can only slide relative to the adjustment plate.

[0018] In one or more embodiments of the present invention, the control device described above includes a heating unit, a cooling unit, and a pressure control device. The heating unit and the cooling unit are both installed inside the inner cavity wall, and the pressure control device is installed outside the first reactor, the second reactor, and the storage tank.

[0019] In one or more embodiments of the present invention, the above includes the following steps:

[0020] S1. Prepolymerization reaction: Diisocyanate and diol are prepolymerized in a certain molar ratio in the first reactor to generate a prepolymer with a certain NCO content. The reaction temperature is 60-80℃, the reaction time is 2-4 hours, and the reaction pressure is 0.1-0.5MPa.

[0021] S2, Chain extension reaction: The prepolymer from the first reactor is mixed with solvent and chain extender in a certain proportion, and the chain extension reaction is carried out in the second reactor to form a high molecular weight block copolymer solution.

[0022] S3. De-monomerization and de-bubbling treatment: Remove unreacted monomers and bubbles from the block copolymer solution coming out of the second reactor. The temperature for the de-monomerization and de-bubbling treatment is 40-60℃, and the vacuum degree is 0.01-0.05MPa.

[0023] S4. Storage and Feeding: The block copolymer solution after degassing and de-bubbling treatment is stored in a storage tank and kept at a suitable temperature, pressure and concentration for spinning. The storage temperature is 30-50℃, the storage pressure is 0.1-0.5MPa and the concentration is 20-30%. Then, the block copolymer solution in the storage tank is delivered to the spinning head at a certain flow rate and pressure using a feed pump.

[0024] Beneficial effects

[0025] This invention provides a continuous prepolymerization device and polymerization method for spandex yarn production. Compared with the prior art, it has the following advantages:

[0026] 1. The present invention is equipped with materials inside the reactor that can circulate during use. During the stirring and mixing process, the materials can form a circulation, thereby enabling the materials to circulate rapidly inside and outside the reactor. This ensures that the material movement can stably contact the heating and cooling units during use, reducing the temperature difference of the materials inside the reactor.

[0027] 2. This invention features a sliding groove for adjusting the plate that changes position according to the stirring rod during use. This allows the height of the adjusting plate to be adjusted based on its movement, thus adapting to the inclination of the guide plate and driving material flow to ensure rapid material circulation within the reactor. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2This is a schematic diagram of the internal structure of the first reactor, the second reactor, and the storage tank of the present invention;

[0030] Figure 3 This is a partial structural diagram of the present invention;

[0031] Figure 4 This is a top view of the adjusting plate structure of the present invention;

[0032] Figure 5 This is a bottom view of the circulating plate structure of the present invention.

[0033] In the diagram: 100 First reactor, 200 Second reactor, 300 Debubbling and desaturation device, 400 Storage tank;

[0034] 101 Stirrer, 102 Heating unit, 103 Cooling unit, 104 Pressure control device, 105 Connecting pipeline;

[0035] 1011 Stirring rod, 1012 Guide plate, 1013 Protective plate, 1014 Circulation plate, 1015 Divider plate, 1016 Sliding sleeve, 1017 Adjusting plate, 1018 Cam, 1019 Limiting protrusion, 1020 Ball bearing, 1021 Guide groove, 1022 Sliding groove, 1023 Positioning block. Detailed Implementation

[0036] The following describes several embodiments of the present invention with reference to the accompanying drawings. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and elements will be shown in the drawings in a simple schematic manner, and in all drawings, the same reference numerals will be used to denote the same or similar elements. And, where feasible, features of different embodiments can be interchanged.

[0037] Unless otherwise defined, all terms used herein (including technical and scientific terms) have their ordinary meanings, which are understandable to those skilled in the art. Furthermore, the definitions of the foregoing terms in commonly used dictionaries should be interpreted in the context of this specification as having the meaning consistent with the relevant field of this invention. Unless specifically defined, these terms will not be construed as having idealized or overly formal meanings.

[0038] Please see Figure 1-5 This invention provides a continuous prepolymerization device for spandex yarn production, comprising:

[0039] First reactor 100;

[0040] The second reactor 200 is located below the first reactor 100. The second reactor 200 is located below the storage tank 400. A degassing and de-bubbling device 300 is located between the storage tank 400 and the second reactor 200. A connecting pipe 105 is connected between the first reactor 100, the second reactor 200, the degassing and de-bubbling device 300 and the storage tank 400.

[0041] The internal structures of the first reactor 100, the second reactor 200 and the storage tank 400 are identical. The inner walls of the first reactor 100, the second reactor 200 and the storage tank 400 are collectively referred to as the inner cavity walls, and each is equipped with a stirrer 101 and a control device.

[0042] The mixer 101 includes:

[0043] A stirring rod 1011 is rotatably disposed inside the first reactor 100, the second reactor 200, and the storage tank 400. The stirring rod extends vertically towards the inner cavity wall. A guide plate 1012 is disposed at the lower part of the stirring frame. The guide plate 1012 is inclined in a threaded manner. A protective plate 1013 is disposed at the end of the guide plate 1012 away from the inner cavity wall. The protective plate 1013, the guide plate 1012, and the inner cavity wall form a U-shape. A circulation plate 1014 is disposed at the upper part of the guide plate 1012. The circulation plate 1014 is arc-shaped.

[0044] The adjusting plate 1017 is movably installed inside the stirring rod 1011 and can rotate and slide relative to the stirring rod 1011.

[0045] In this embodiment, the guide plate 1012, the guard plate 1013, and the circulation plate 1014 are configured in an arc-shaped guiding configuration. During the rotation of the stirring rod 1011, the material can be driven to rotate inside the inner cavity wall, thereby rotating rapidly and making the material rotate inside the inner cavity wall to quickly contact the cooling unit 103 and the heating unit 102.

[0046] In one embodiment, an adjusting plate 1017 is disposed inside the protective plate 1013. The middle part of the adjusting plate 1017 is axially shaped. The inner side of the stirring rod 1011 is provided with a sliding sleeve 1016 sleeved on the middle part of the adjusting plate 1017. The stirring rod 1011 can rotate and slide relative to the sliding sleeve 1016.

[0047] In this embodiment, the central part of the adjusting plate 1017 is axially shaped to facilitate the rotation of the adjusting plate 1017, while the sliding sleeve 1016 allows the edge of the adjusting plate 1017 to slide. Thus, the position of the adjusting plate 1017 can be limited by the positioning block 1023 and the cam 1018, thereby adjusting the position of the adjusting plate 1017 and causing the adjusting plate 1017 to drive the material to move inside the inner cavity wall.

[0048] In one embodiment, a positioning block 1023 is disposed at one end of the adjusting plate 1017 near the inner cavity wall. The positioning block 1023 extends into the inner cavity wall, and the inner cavity wall is provided with a groove 1022 that restricts the positioning block 1023. The groove 1022 is corrugated.

[0049] In this embodiment, the positioning block 1023 and the slide groove 1022 can restrict the adjustment plate 1017, and the slide groove 1022 and the guide plate 1012 have the same inclination slope, which can prevent the adjustment plate 1017 from contacting the guide plate 1012 during the movement, thus preventing the guide plate 1012 from being worn.

[0050] In one embodiment, a partition plate 1015 is disposed on the inner side of the inner cavity wall. The partition plate 1015 is fixed to the inner side of the inner cavity wall, and the stirring rod 1011 is set in multiples of the partition plate 1015. The upper end of the adjusting plate 1017 extends to the inner side of the partition plate 1015. A guide groove 1021 is disposed on the inner side of the partition plate 1015, and the adjusting plate 1017 extends to the inner side of the guide plate 1012.

[0051] In this embodiment, the partition plate 1015 can divide the inner cavity wall into multiple regions, and each region is equipped with multiple stirring rods 1011. The stirring rods 1011 drive the adjusting plate 1017 to rotate, which can make the material in that region move.

[0052] In one embodiment, a cam 1018 is disposed on the upper end of the adjusting plate 1017. The cam 1018 is slidably sleeved on the outside of the adjusting plate 1017. The cam 1018 extends into the guide groove 1021. An upwardly extending limiting protrusion 1019 is provided on the top of the cam 1018. The limiting protrusion 1019 is limited by the guide groove 1021.

[0053] In this embodiment, the cam 1018 and the limiting protrusion 1019 are restricted by the guide groove 1021, thereby restricting the movement of the cam 1018. Under the restriction of the guide groove 1021, the adjusting plate 1017 can swing, thereby adjusting according to the position of the guard plate 1013.

[0054] In one embodiment, a ball bearing 1020 is disposed inside the limiting protrusion 1019. The ball bearing 1020 is rotatably disposed inside the limiting protrusion 1019 and contacts the inner wall of the guide groove 1021. The circulation plate 1014 is fixed to the outer wall of the partition plate 1015. The inner side of the cam 1018 is polygonal, and the upper part of the adjusting plate 1017 is adapted to the shape of the inner side of the cam 1018. The cam 1018 can only slide relative to the adjusting plate 1017.

[0055] In this embodiment, the polygonal configuration of the cam 1018 ensures synchronous movement with the adjustment plate 1017, and the cam 1018 can slide up and down relative to the adjustment plate 1017. During the adjustment of the adjustment plate 1017, it can be restricted by the cam 1018, and the setting of the ball bearing 1020 can reduce wear during the movement.

[0056] In one embodiment, the control device includes a heating unit 102, a cooling unit 103, and a pressure control device 104. The heating unit 102 and the cooling unit 103 are both installed inside the inner cavity wall, and the pressure control device 104 is installed outside the first reactor 100, the second reactor 200, and the storage tank 400.

[0057] In one embodiment, the following steps are included:

[0058] S1. Prepolymerization reaction: Diisocyanate and diol are prepolymerized in the first reactor 100 at a certain molar ratio to generate a prepolymer with a certain NCO content. The reaction temperature is 60-80℃, the reaction time is 2-4 hours, and the reaction pressure is 0.1-0.5MPa.

[0059] S2, Chain extension reaction: The prepolymer from the first reactor is mixed with solvent and chain extender in a certain proportion, and the chain extension reaction is carried out in the second reactor to form a high molecular weight block copolymer solution.

[0060] S3. De-monomerization and de-bubbling treatment: Remove unreacted monomers and bubbles from the block copolymer solution exiting the second reactor 200. The temperature for the de-monomerization and de-bubbling treatment is 40-60℃, and the vacuum degree is 0.01-0.05MPa.

[0061] S4. Storage and Feeding: The block copolymer solution after degassing and de-bubbling treatment is stored in storage tank 300, and its temperature, pressure and concentration are kept suitable for spinning. The storage temperature is 30-50℃, the storage pressure is 0.1-0.5MPa and the concentration is 20-30%. Then, the block copolymer solution in storage tank 400 is delivered to the spinning head at a certain flow rate and pressure using a feed pump.

[0062] Although the present invention has been disclosed in conjunction with the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A continuous prepolymerization device for producing spandex yarn, characterized in that, include: First reactor; The second reactor is located below the first reactor. A storage tank is located below the second reactor. A degassing and de-bubbling device is located between the storage tank and the second reactor. A connecting pipeline is provided between the first reactor, the second reactor, the degassing and de-bubbling device, and the storage tank to form a connection. The internal structures of the first reactor, the second reactor, and the storage tank are identical. The inner walls of the first reactor, the second reactor, and the storage tank are collectively referred to as the inner cavity walls. The first reactor, the second reactor, and the storage tank are all equipped with a stirrer and a control device. The mixer includes: Multiple sets of horizontally arranged stirring rods are rotatably configured inside the first reactor, the second reactor, and the storage tank. The stirring rods extend vertically towards the inner cavity wall. A guide plate is arranged at the lower part of the stirring rod. The guide plate is inclined in a threaded shape, and a protective plate is arranged at the end of the guide plate away from the inner cavity wall. The protective plate, the guide plate, and the inner cavity wall form a U-shape. A partition plate is arranged on the inner side of the inner cavity wall and is fixed to the inner side of the inner cavity wall. The stirring rods are arranged in multiples of the partition plate. The upper part of the adjusting plate extends to the inner side of the partition plate. A guide groove is arranged on the inner side of the partition plate. The adjusting plate extends to the inner side of the guide groove. A circulation plate is arranged in an arc shape on the upper part of the guide plate and is fixed to the outer wall below the partition plate. An adjusting plate is movably mounted on the stirring rod and can rotate and slide relative to the stirring rod. The adjusting plate is located inside the protective plate and has a shaft-like structure in the middle. A sliding sleeve is fitted onto the middle of the adjusting plate on the stirring rod. The adjusting plate can rotate and slide relative to the sliding sleeve. A positioning block is located at one end of the adjusting plate near the inner cavity wall and extends to the inner cavity wall. The inner cavity wall is provided with a groove that restricts the positioning block. The groove is corrugated and has the same slope as the guide plate.

2. The continuous prepolymerization equipment for producing spandex yarn according to claim 1, characterized in that, A cam is configured at the upper end of the adjustment plate. The cam can be slidably sleeved on the outside of the adjustment plate. The cam extends into the guide groove. An upwardly extending limiting protrusion is provided at the top of the cam. The limiting protrusion is limited by the guide groove.

3. The continuous prepolymerization equipment for producing spandex yarn according to claim 2, characterized in that, The limiting protrusion is equipped with a ball bearing that can be rotatably positioned inside the limiting protrusion. The ball bearing contacts the inner wall of the guide groove. The inner side of the cam is polygonal, and the upper part of the adjusting plate is adapted to the shape of the inner side of the cam. The cam can only slide relative to the adjusting plate.

4. The continuous prepolymerization equipment for spandex yarn production according to claim 1, characterized in that, The control device includes a heating unit, a cooling unit, and a pressure control device. The heating unit and the cooling unit are installed inside the inner cavity wall, and the pressure control device is installed outside the first reactor, the second reactor, and the storage tank.

5. A polymerization method for producing spandex yarn, utilizing the continuous prepolymerization equipment for producing spandex yarn as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Prepolymerization reaction: Diisocyanate and diol are prepolymerized in a certain molar ratio in the first reactor to generate a prepolymer with a certain NCO content. The reaction temperature is 60~80℃, the reaction time is 2~4 hours, and the reaction pressure is 0.1~0.5MPa. S2, Chain extension reaction: The prepolymer from the first reactor is mixed with solvent and chain extender in a certain proportion, and the chain extension reaction is carried out in the second reactor to form a high molecular weight block copolymer solution. S3. De-monomerization and de-bubbling treatment: Remove unreacted monomers and bubbles from the block copolymer solution coming out of the second reactor. The temperature for the de-monomerization and de-bubbling treatment is 40~60℃, and the vacuum degree is 0.01~0.05MPa. S4. Storage and Feeding: The block copolymer solution after degassing and de-monopolymerization is stored in a storage tank and kept at a suitable temperature, pressure and concentration for spinning. The storage temperature is 30~50℃ and the storage pressure is 0.1~0.5MPa. Then, the block copolymer solution in the storage tank is delivered to the spinning head at a certain flow rate and pressure using a feed pump.

Images