Dissolving device and system capable of industrially and efficiently preparing chitosan spinning solution

Abstract

The utility model discloses a dissolving device and system capable of industrially and efficiently preparing a chitosan spinning solution, and belongs to the field of preparation, processing and application of natural polymer fibers. Wherein the dissolving device comprises a shell, a stirring main shaft and a stirring unit, the stirring unit comprises at least two connecting rods and impeller blades, the connecting rods are arranged on the stirring main shaft in a sleeving manner, and the included angle between each connecting rod and the stirring main shaft is 90 degrees; the impeller blades are evenly distributed on the connecting rod, the included angle between the center line of each impeller blade and the center line of the connecting rod ranges from 90 degrees to 120 degrees, the length of the impeller blade in the middle of the connecting rod is larger than that of the impeller blade at the tail end of the connecting rod, and the distance between the impeller blade close to the inner wall of the shell and the inner wall of the shell ranges from 3 mm to 6 mm. The utility model further provides a system comprising the dissolving device. The dissolving efficiency and effect of the chitosan are effectively improved, the time required for dissolving the raw materials is greatly reduced, and the like, so that the industrial efficient preparation of the chitosan spinning solution is ensured.

Description

Technical Field

[0001] The utility model relates to a preparation device for chitosan spinning solution, in particular to a dissolving device and system for industrially and efficiently preparing chitosan spinning solution, belonging to the field of natural polymer fiber preparation, processing and application. Background Art

[0002] Chitosan is a product obtained by deacetylation of chitin. It is the only alkaline natural polysaccharide in nature. Its reserves are second only to cellulose. It is known as the "sixth life element of the human body" in addition to sugars, proteins, fats, vitamins and minerals. Chitosan has good biocompatibility, biodegradability, antioxidant properties, pH sensitivity, tissue adhesion and metal ion chelating ability. Therefore, it has broad application prospects in biomedicine, tissue engineering, water treatment, textile industry, energy catalysis and inorganic nanoparticle carriers.

[0003] Chitosan fiber is a product obtained by dissolving and spinning chitosan as raw material. It is a fiber material with broad-spectrum antibacterial properties. It not only has good moisture absorption and air permeability, but also has biological functions such as hemostasis and promotion of wound healing. It has great application potential in high-end textiles such as medical products.

[0004] Chitosan contains a large number of amino groups on its molecular chain and can be dissolved in various low-concentration inorganic or organic acid solutions. At present, in the industrial preparation of chitosan spinning solution, an acidic aqueous solution is usually used to dissolve it. However, once the chitosan raw material contacts the acidic solution, the chitosan raw material on the surface will dissolve quickly, thereby wrapping up the undissolved chitosan raw material inside, which seriously hinders the penetration of the solvent, resulting in a significant reduction in the dissolution effect and dissolution efficiency. In addition, due to the large molecular weight of the chitosan raw material, the solution viscosity formed after dissolution is high, and the solution is difficult to degas, which further increases the difficulty of industrial preparation of chitosan spinning solution.

[0005] Although the prior art "CN114775069A A method for degassing spinning solution for industrial production of pure chitosan fiber" discloses that: the reaction kettle includes a tank body and a defoaming device; "CN203494407U A dissolving device for pure chitosan spinning solution" discloses that: it includes a dissolving kettle (1) and a stirring device (2), the upper part of the dissolving kettle (1) is provided with a feed port (5), a solvent inlet (6), a water inlet (9) and a vacuum port (7), and the bottom is provided with a discharge port (11). However, during dissolution and stirring, the shearing effect is relatively weak; and the viscosity of the chitosan solution is relatively high, which affects the dissolution efficiency of the chitosan. In addition, the prior art "CN101812743A A spinning solution for industrial production of pure chitosan fiber and its preparation method" mainly solves the technical problem of how to prepare high-performance pure chitosan spinning solution using flaky chitosan raw materials in large-scale industrial production.

[0006] Therefore, there is a need for a device that can effectively improve the dissolution efficiency and dissolution effect, reduce bubble generation, and can industrially and efficiently prepare chitosan spinning solution. Summary of the invention

[0007] In order to effectively solve the above problems, the utility model proposes a dissolution device and system for industrially and efficiently preparing chitosan spinning solution. This technical solution can not only effectively improve the dissolution efficiency and dissolution effect of chitosan, and greatly reduce the time required for raw material dissolution; it can also reduce the generation of bubbles during the dissolution process, facilitate the subsequent filtration of the spinning solution and the spinning process, and thus ensure the industrial and efficient preparation of chitosan spinning solution;

[0008] In addition, the dissolving device in the utility model adopts a unique stirring unit, which is beneficial to breaking up the agglomerated medium, making the chitosan raw material evenly dispersed, and facilitating the rapid dissolution of chitosan; on the other hand, it prevents the formation of a stirring dead corner at the bottom of the tank, and can realize the industrial rapid dissolution of chitosan raw materials, thereby improving the efficiency of the chitosan spinning solution preparation process.

[0009] In order to achieve the above technical objectives, the following technical solutions are proposed:

[0010] The first purpose of the technical solution is to provide: a dissolving device capable of industrially and efficiently preparing chitosan spinning solution, comprising a housing and a stirring main shaft and a stirring unit arranged in the housing;

[0011] Shell: The upper part of the shell is provided with a vacuum tube connector and a feed port, and the outer side of the shell is provided with a temperature regulating jacket; the bottom of the shell is provided with a discharge port;

[0012] Stirring main shaft: It is arranged longitudinally, the upper end of the stirring main shaft extends outside the shell and is connected to a motor with a reducer, the motor provides stirring power, the reducer adjusts the motor rotation speed, and the motor and the stirring shaft are connected through a coupling; the lower end of the stirring main shaft extends to the bottom of the shell and is connected to the shell through a bearing seat;

[0013] The stirring unit includes a connecting rod and an impeller blade. There are at least two connecting rods, which are all sleeved on the stirring main shaft. The angle between the connecting rod and the stirring main shaft is 90°. There are at least two impeller blades, which are evenly distributed on the connecting rod. The angle between the center line of the impeller blade and the center line of the connecting rod is 90° to 120°. The length of the impeller blade in the middle of the connecting rod is greater than that of the impeller blade at the end of the connecting rod. The distance between the impeller blade close to the inner wall of the shell and the inner wall of the shell is 3 to 6 mm.

[0014] Furthermore, there are at least two stirring units to improve dissolution efficiency and quality.

[0015] Furthermore, in the same stirring unit, the connecting rods are arranged in the same horizontal plane. This arrangement ensures that the materials are mixed evenly, and at the same time, the materials are repeatedly sheared and stirred by the blades, thereby improving the dissolution efficiency and quality.

[0016] Furthermore, the stirring main shaft is connected to the shell in a mechanical sealing manner to ensure that the tank body is sealed when the stirring main shaft rotates.

[0017] Furthermore, the shell is arranged on a bracket. In this arrangement, the bracket is used to support the shell. On the one hand, it ensures that the shell is higher than the ground to prevent it from being affected by the ground (water stains, moisture, pollution from other substances, etc.), that is, to increase its service life; on the other hand, it ensures high-position discharging, thereby ensuring the orderliness and effectiveness of the discharging.

[0018] Furthermore, a mounting frame is provided on the top of the shell, and the motor and the reducer are both arranged on the mounting frame. This arrangement facilitates the arrangement of the motor, the reducer, the stirring spindle, etc., thereby ensuring the smoothness of the dissolution process.

[0019] Furthermore, a temperature regulating medium outlet valve is provided on the upper part of the temperature regulating jacket for outputting the temperature regulating medium from the temperature regulating jacket; a temperature regulating medium inlet valve is provided on the lower part of the temperature regulating jacket for inputting the temperature regulating medium into the temperature regulating jacket to adjust the temperature inside the shell, that is, the heating medium enters from the bottom and exits from the top, thus ensuring the heating efficiency and quality, and thus improving the dissolution efficiency and quality.

[0020] Furthermore, there are two temperature regulating jackets, which ensure heating efficiency and quality while facilitating the installation of structural components, thereby improving the dissolution efficiency and quality in the preparation of chitosan spinning solution.

[0021] The second purpose of the technical solution is to provide: a system for industrially and efficiently preparing chitosan spinning solution, comprising a chitosan storage tank, a deionized water storage tank, an acid storage tank, a chitosan dispersion preparation tank, the dissolving device and the acid solution preparation tank, wherein the chitosan storage tank and the deionized water storage tank are both connected to the chitosan dispersion preparation tank;

[0022] The acid storage tank and the deionized water storage tank are both connected to the acid solution preparation tank;

[0023] The chitosan dispersion preparation tank is connected to the dissolving device through a chitosan dispersion delivery pipe;

[0024] The acid solution preparation tank is connected to the dissolving device through an acid solution delivery pipe;

[0025] The dissolving device is connected with a vacuum device and a heating device.

[0026] Furthermore, the dissolving device is also connected to a chitosan spinning solution storage tank.

[0027] The relationships involved in this technical solution, such as "between", "on", "inside", "upper part", "outside", "bottom", "longitudinal", "outside", "upper end", and "top", are defined according to the situations under actual usage conditions. They are conventional terms in this technical field and are also conventional terms used by technical personnel in this field in actual use.

[0028] The beneficial technical effects brought about by adopting this technical solution are:

[0029] 1. The utility model can not only effectively improve the dissolution efficiency and dissolution effect of chitosan, and greatly reduce the time required for raw material dissolution; but also reduce the generation of bubbles during the dissolution process, which is convenient for the subsequent filtration of the spinning solution and the spinning process, thereby ensuring the industrialized and efficient preparation of the chitosan spinning solution;

[0030] Second, the dissolving device in the utility model is provided with a vacuum tube connector to ensure that the chitosan raw material dispersion and dissolution processes are both carried out under vacuum conditions, which helps to reduce the generation of bubbles during the dissolution process, so that there are fewer bubbles in the final chitosan spinning solution, and solves the problem of difficulty in degassing the chitosan spinning solution due to its high viscosity, which is beneficial to the subsequent filtration of the spinning solution and the spinning process;

[0031] 3. The dissolving device in the utility model adopts a unique stirring unit, which is conducive to breaking up the agglomerated medium, making the chitosan raw material evenly dispersed, and is conducive to the rapid dissolution of chitosan; on the other hand, it prevents the formation of a stirring dead corner at the bottom of the tank, and can achieve industrial rapid dissolution of chitosan raw materials, thereby improving the efficiency of the chitosan spinning solution preparation process;

[0032] 4. In the system of the utility model, the chitosan storage tank, deionized water storage tank, chitosan dispersion preparation tank, acid storage tank, acid solution preparation tank and the like are arranged to ensure that the chitosan raw material is first dispersed in deionized water to form a dispersion, and then an acidic aqueous solution is added for dissolution. The chitosan raw material is not directly added to the acidic aqueous solution. This not only reduces the agglomeration of the chitosan raw material during the dissolution process, but also greatly shortens the time required for dissolution, effectively improving the dissolution effect and efficiency of the chitosan. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the dissolving device in the utility model;

[0034] Figure 2 It is a schematic diagram of the installation of the stirring mechanism in the utility model (top view);

[0035] Figure 3 It is a structural block diagram of the preparation system in the utility model;

[0036] Figure 4 It is a flow chart of the preparation process in the utility model;

[0037] In the figure, 1. motor, 2. reducer, 3. mounting frame, 4. mechanical seal, 5. vacuum tube connector, 6. stirring unit, 7. temperature control medium inlet valve, 8. temperature control medium outlet valve, 9. discharge port, 10. impeller blade, 11. connecting rod, 12. stirring main shaft, 13. bearing seat, 14. shell, 15. feed port, 16. bracket, 17. coupling, 18. chitosan storage tank, 19. deionized water storage tank, 20. acid storage tank, 21. chitosan dispersion preparation tank, 22. dissolving device, 23. acid solution preparation tank, 24. vacuum device, 25. heating device, 26. chitosan spinning solution storage tank. DETAILED DESCRIPTION

[0038] The following is a clear and complete description of the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Example 1

[0040] The present embodiment provides: a dissolving device for industrially and efficiently preparing chitosan spinning solution, comprising a shell 14 and a stirring main shaft 12 and a stirring unit 6 arranged in the shell 14; a vacuum tube connector 5 and a feed port 15 are arranged on the upper part of the shell 14, and a temperature regulating jacket is arranged on the outer side of the shell 14; a discharge port 9 is arranged at the bottom of the shell 14; the stirring main shaft 12 is arranged in a longitudinal direction, and the upper end of the stirring main shaft 12 extends to the outside of the shell 14 and is connected to a motor 1 with a reducer 2, the motor 1 provides stirring power, the reducer 2 adjusts the rotation speed of the motor 1, and the motor 1 and the stirring shaft are connected through a coupling 17; the lower end of the stirring main shaft 12 extends to the bottom of the shell 14, through the bearing seat 1 3 is connected to the housing 14; the stirring unit 6 includes a connecting rod 11 and an impeller blade 10, at least two connecting rods 11, all of which are sleeved on the stirring main shaft 12, and the angle between the connecting rod 11 and the stirring main shaft 12 is 90° (the connecting rod 11 is perpendicular to the stirring main shaft 12); at least two impeller blades 10 are evenly distributed on the connecting rod 11, and the angle between the center line of the impeller blade 10 and the center line of the connecting rod 11 is 90°~120°, the length of the impeller blade 10 in the middle of the connecting rod 11 is greater than the length of the impeller blade 10 at the end of the connecting rod 11, and the distance between the impeller blade 10 close to the inner wall of the housing 14 and the inner wall of the housing 14 is 3~6mm.

[0041] In the stirring unit 6, the angle between the center line of the impeller blade 10 and the center line of the connecting rod 11 is 90° to 120°. Furthermore, the angles between the center lines of the impeller blade 10 and the connecting rod 11 are not consistent, which is conducive to sufficient stirring without leaving dead corners.

[0042] On each connecting rod 11, the lengths of the impeller blades 10 are inconsistent. The length of the impeller blade 10 in the middle of the connecting rod 11 is greater than the length of the impeller blade 10 at the end of the connecting rod 11, that is, the impeller blade 10 close to the inner wall of the shell 14 is the shortest; the impeller blade 10 close to the bottom of the shell 14 is in a head shape, which matches the shape of the bottom of the shell 14 to prevent the formation of a stirring dead angle at the bottom of the shell 14.

[0043] More specifically, the distance between the impeller blade 10 close to the inner wall of the housing 14 and the inner wall of the housing 14 is 3 to 6 mm. The interval between the impeller blade 10 close to the inner wall of the housing 14 and the inner wall of the housing 14 is small enough to scrape off the residual medium adhering to the inner wall of the housing 14, enter the intermediate medium, and mix evenly.

[0044] Example 2

[0045] On the basis of Example 1, this example defines the stirring unit 6 to further illustrate the present technical aspect.

[0046] There are at least two stirring units 6 to improve dissolution efficiency and quality. The specific number of stirring units 6 can be determined according to the size and shape of the inner cavity of the housing 14.

[0047] In the same stirring unit 6, the connecting rods 11 are arranged in the same horizontal plane. This arrangement ensures that the materials are mixed evenly. At the same time, the materials are repeatedly sheared and stirred by the blades, thereby improving the dissolution efficiency and quality.

[0048] In the stirring unit 6, the edge of the impeller blade 10 is arranged in a knife-edge shape, which is conducive to breaking up the clumped medium, making the medium dispersed evenly, and facilitating the rapid dissolution of chitosan.

[0049] Example 3

[0050] On the basis of Embodiments 1-2, this embodiment limits the installation of the stirring spindle 12 to further illustrate the present technology.

[0051] The stirring main shaft 12 and the shell 14 are connected by mechanical seal 4 to ensure that the tank is sealed when the stirring main shaft 12 rotates.

[0052] Example 4

[0053] On the basis of embodiments 1-3, this embodiment defines the housing 14 to further illustrate the present technology.

[0054] The shell 14 is arranged on a bracket 16. In this arrangement, the bracket 16 is used to support the shell 14. On the one hand, it ensures that the shell 14 is higher than the ground to prevent it from being affected by the ground (water stains, moisture, pollution from other substances, etc.), that is, to increase its service life; on the other hand, it ensures high-position discharging, thereby ensuring the orderliness and effectiveness of the discharging.

[0055] A mounting frame 3 is provided on the top of the shell 14, and the motor 1 and the reducer 2 are both arranged on the mounting frame 3. This arrangement facilitates the arrangement of the motor 1, the reducer 2, the stirring spindle 12, etc., thereby ensuring the smoothness of the dissolution process.

[0056] Example 5

[0057] On the basis of Examples 1-4, this example defines the temperature regulating jacket to further illustrate the present technology.

[0058] A temperature regulating medium outlet valve 8 is provided at the upper part of the temperature regulating jacket for outputting the temperature regulating medium from the temperature regulating jacket; a temperature regulating medium inlet valve 7 is provided at the lower part of the temperature regulating jacket for inputting the temperature regulating medium into the temperature regulating jacket to adjust the temperature in the shell 14. That is, the heating medium enters from the bottom and exits from the top, ensuring the heating efficiency and quality, thereby improving the dissolution efficiency and quality.

[0059] Preferably, there are two temperature regulating jackets, which ensure heating efficiency and quality while facilitating the installation of structural components, thereby improving the dissolution efficiency and quality in the preparation of chitosan spinning solution.

[0060] Example 6

[0061] On the basis of Examples 1-5, this embodiment provides: a system for industrially and efficiently preparing chitosan spinning solution, comprising a chitosan storage tank 18, a deionized water storage tank 19, an acid storage tank 20, a chitosan dispersion preparation tank 21, the dissolving device 22 and an acid solution preparation tank 23, wherein the chitosan storage tank 18 and the deionized water storage tank 19 are both connected to the chitosan dispersion preparation tank 21;

[0062] The acid storage tank 20 and the deionized water storage tank 19 are both connected to the acid solution preparation tank 23;

[0063] The chitosan dispersion preparation tank 21 is connected to the dissolving device 22 via a chitosan dispersion delivery pipe;

[0064] The acid solution preparation tank 23 is connected to the dissolving device 22 through an acid solution delivery pipe;

[0065] The dissolving device 22 is connected to a vacuum device 24 and a heating device 25 .

[0066] The dissolving device 22 is also connected to a chitosan spinning solution storage tank 26 .

[0067] Example 7

[0068] On the basis of Examples 1-6, this Example provides: a process for industrially and efficiently preparing chitosan spinning solution, wherein the chitosan spinning solution is used to prepare lyocell cross-linked staple fibers, wherein the preparation of the chitosan spinning solution comprises the following steps:

[0069] S1: Preparation of chitosan dispersion

[0070] Weigh the chitosan raw material, add it into deionized water, stir and disperse it, and form a uniform chitosan dispersion in a chitosan dispersion preparation tank;

[0071] The chitosan raw material is industrial grade raw material, with a viscosity of 450-550 mPa.s and a deacetylation degree of 80-90%; the concentration of chitosan in the chitosan dispersion is 6-10wt%;

[0072] S2: Vacuum stirring and degassing

[0073] The chitosan dispersion in the chitosan dispersion preparation tank is passed into the dissolving device and vacuum stirred to achieve degassing;

[0074] The vacuum degree in the dissolving device is controlled to be -0.1 to -0.1 MPa, the stirring speed is 100 to 200 rpm / min, and the stirring time is 5 to 10 min;

[0075] S3: Preparation of dilute acid solution

[0076] In an acid solution preparation tank, prepare a dilute acid aqueous solution with a concentration of 4 to 8 wt%;

[0077] The acid in the dilute acid aqueous solution is one of organic acids or inorganic acids such as acetic acid, citric acid, and hydrochloric acid;

[0078] S4: Vacuum heating and stirring to dissolve

[0079] Add the diluted acid solution in the acid solution preparation tank to the dissolving device, heat and stir in vacuum to achieve uniform mixing and dissolution, and obtain chitosan spinning solution, which can be temporarily stored in the chitosan spinning solution storage tank;

[0080] The dissolving device is controlled to have a vacuum degree of -0.1 to -0.1 MPa, a heating temperature of 40 to 60°C, a stirring speed of 40 to 80 rpm / min, and a stirring time of 1 to 2 h.

[0081] In the chitosan spinning solution, the concentration of chitosan is 3-5 wt%, and the concentration of acid is 1-6 wt%.

[0082] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A dissolving device for industrially and efficiently preparing chitosan spinning solution, characterized in that: The invention comprises a shell (14), a stirring main shaft (12) and a stirring unit (6) arranged in the shell (14); a vacuum tube connector (5) and a feed port (15) are arranged on the upper part of the shell (14); a temperature regulating jacket is arranged on the outer side of the shell (14); and a discharge port (9) is arranged on the bottom of the shell (14); The stirring main shaft (12) is arranged longitudinally, and the upper end of the stirring main shaft (12) extends outside the housing (14) and is connected to the motor (1) with the reducer (2); the lower end of the stirring main shaft (12) extends to the bottom of the housing (14) and is connected to the housing (14) via a bearing seat (13); The stirring unit (6) comprises a connecting rod (11) and an impeller blade (10), wherein there are at least two connecting rods (11), each of which is sleeved on a stirring main shaft (12), and the angle between the connecting rod (11) and the stirring main shaft (12) is 90°; and there are at least two impeller blades (10), which are evenly distributed on the connecting rod (11), and the angle between the center line of the impeller blade (10) and the center line of the connecting rod (11) is 90° to 120°, the length of the impeller blade (10) in the middle of the connecting rod (11) is greater than the length of the impeller blade (10) at the end of the connecting rod (11), and the distance between the impeller blade (10) close to the inner wall of the housing (14) and the inner wall of the housing (14) is 3 to 6 mm.

2. The dissolving device for industrially and efficiently preparing chitosan spinning solution according to claim 1 is characterized in that: There are at least two stirring units (6).

3. The dissolving device for industrially and efficiently preparing chitosan spinning solution according to claim 2, characterized in that: In the same stirring unit (6), the connecting rods (11) are arranged on the same horizontal plane.

4. The dissolving device for industrially and efficiently preparing chitosan spinning solution according to claim 1, characterized in that: The stirring main shaft (12) and the housing (14) are connected by a mechanical seal (4).

5. The dissolving device for industrially and efficiently preparing chitosan spinning solution according to claim 1, characterized in that: The housing (14) is arranged on a bracket (16).

6. The dissolving device for industrially and efficiently preparing chitosan spinning solution according to claim 1, characterized in that: A mounting frame (3) is provided on the top of the housing (14), and the motor (1) and the reducer (2) are both arranged on the mounting frame (3).

7. The dissolving device for industrially and efficiently preparing chitosan spinning solution according to claim 1, characterized in that: A temperature regulating medium outlet valve (8) is provided at the upper portion of the temperature regulating jacket, and a temperature regulating medium inlet valve (7) is provided at the lower portion of the temperature regulating jacket.

8. The dissolving device for industrially and efficiently preparing chitosan spinning solution according to claim 7, characterized in that: There are two temperature regulating jackets.

9. A system for industrially and efficiently preparing chitosan spinning solution, characterized in that: It comprises a chitosan storage tank (18), a deionized water storage tank (19), an acid storage tank (20), a chitosan dispersion preparation tank (21), a dissolving device (22) according to any one of claims 1 to 8, and an acid solution preparation tank (23), wherein the chitosan storage tank (18) and the deionized water storage tank (19) are both connected to the chitosan dispersion preparation tank (21); The acid storage tank (20) and the deionized water storage tank (19) are both connected to the acid solution preparation tank (23); The chitosan dispersion preparation tank (21) is connected to the dissolution device (22) via a chitosan dispersion delivery pipe; The acid solution preparation tank (23) is connected to the dissolving device (22) via an acid solution delivery pipe; The dissolving device (22) is connected to a vacuum device (24) and a heating device (25).

10. The system for industrially and efficiently preparing chitosan spinning solution according to claim 9, characterized in that: The dissolving device (22) is also connected to a chitosan spinning solution storage tank (26).

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