Preparation system suitable for antibacterial flame-retardant lyocell fibers

Abstract

The utility model discloses a preparation system suitable for antibacterial flame-retardant lyocell fibers, and belongs to the technical field of functional fibers. The preparation system comprises a conveying mesh belt and at least seven compression roller sets, the conveying mesh belt comprises a chitosan solution spraying section, an alkali liquor spraying section, a water spraying section I, a sodium alginate solution spraying section, a cross-linking liquid spraying section and a water spraying section II, and the compression roller sets are distributed on the front sides of stations of the spraying sections. The spraying sections are respectively used for squeezing washing water, unadsorbed chitosan, unreacted alkali liquor, spraying water, unadsorbed sodium alginate, unreacted cross-linking liquid and spraying water, and spraying devices corresponding to solutions are arranged above stations of the spraying sections. The preparation system is well matched with an antibacterial and flame-retardant lyocell fiber production process, and continuous and industrial production of the antibacterial and flame-retardant lyocell fibers is guaranteed; moreover, it is guaranteed that the fiber has excellent antibacterial performance and good flame retardant performance, meanwhile, it is guaranteed that the production process of the functional fiber is stable, and the related preparation has industrial application prospects.

Description

Technical Field

[0001] The utility model specifically relates to a preparation system applicable to antibacterial and flame-retardant lyocell fibers, belonging to the technical field of functionalized cellulose regenerated fibers. Background Art

[0002] Lyocell fiber is known as the "green fiber" of the 21st century. It is a new type of regenerated cellulose fiber produced by physical dissolution and regeneration. The whole production process is green and pollution-free. As a brand-new textile fabric, lyocell fiber combines the excellent properties of natural fibers and synthetic fibers. It not only has mechanical properties comparable to chemical fibers but also has the comfort and touch of cotton fibers and silk. It is widely used in the textile field. Like other regenerated cellulose fibers, lyocell fiber is a flammable material. Its textiles are also extremely flammable and can easily cause fires. Therefore, the development of flame-retardant lyocell fiber is crucial for the application of lyocell fiber in the textile field.

[0003] At present, the preparation of flame-retardant lyocell fiber mainly combines flame retardants such as halogen-based, phosphorus-based, silicon-based, and nitrogen-based with lyocell fiber through blending, graft copolymerization, and post-finishing. However, most of these flame retardants have certain chemical toxicity, which will not only reduce the originally excellent biocompatibility of lyocell fiber but also cause certain environmental protection pressure in production. Moreover, although the flame-retardant lyocell fiber prepared by these flame retardants can achieve the flame-retardant effect, it will produce harmful and unpleasant gases, causing harm to the human body. In addition, like other synthetic fibers, lyocell fiber is prone to breeding bacteria and fungi, which will be restricted to a certain extent in the application in the fields of high-end home textiles and high-end women's clothing. If the antibacterial and flame-retardant properties can be simultaneously imparted to lyocell fiber, then lyocell fiber will be more widely used in the textile field.

[0004] Although the prior art discloses antibacterial lyocell fiber and / or flame-retardant lyocell fiber, there are still the following technical problems:

[0005] First, the antibacterial and / or flame-retardant effects are poor. After multiple washes, the antibacterial and flame-retardant functions decline rapidly.

[0006] Second, in order to impart the antibacterial and flame-retardant functions to lyocell fiber, antibacterial agents, alkaline auxiliaries, penetrants, metal cations, etc. are used, which pose potential safety hazards to the human body and cause certain environmental pollution, and thus will be greatly restricted in the application in the textile field.

[0007] Third, the preparation system for antibacterial and flame-retardant lyocell fiber involved is almost blank. Summary of the Invention

[0008] In order to continuously and industrially produce antibacterial and flame-retardant Lyocell fibers, a preparation system suitable for antibacterial and flame-retardant Lyocell fibers is proposed, that is, to provide a matching preparation system for the production process of antibacterial and flame-retardant Lyocell fibers, so as to ensure that the fibers have excellent antibacterial properties and good flame-retardant properties. At the same time, ensure the stability of the production process of functional fibers, and the involved preparation has industrial application prospects.

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

[0010] A preparation system suitable for antibacterial and flame-retardant Lyocell fibers includes a conveyor belt and at least seven roller groups distributed on the conveyor belt. The conveyor belt includes a chitosan solution spraying section, an alkali solution spraying section, a water spraying section I, an alginate solution spraying section, a cross-linking solution spraying section, and a water spraying section II arranged in sequence. There is a roller group for squeezing water in front of the working station of the chitosan solution spraying section. There is a roller group for squeezing unadsorbed chitosan between the chitosan solution spraying section and the alkali solution spraying section. There is a roller group for squeezing unreacted alkali solution between the alkali solution spraying section and the water spraying section I. There is a roller group for squeezing water between the water spraying section I and the alginate solution spraying section. There is a roller group for squeezing unadsorbed alginate between the alginate solution spraying section and the cross-linking solution spraying section. There is a roller group for squeezing unreacted cross-linking solution between the cross-linking solution spraying section and the water spraying section II. There is a roller group for squeezing water behind the working station of the water spraying section II;

[0011] And, there is a chitosan solution spraying device above the working station of the chitosan solution spraying section, an alkali solution spraying device above the working station of the alkali solution spraying section, a water spraying device I above the working station of the water spraying section I, an alginate solution spraying device above the working station of the alginate solution spraying section, a cross-linking solution spraying device above the working station of the cross-linking solution spraying section, and a water spraying device II above the working station of the water spraying section II.

[0012] Further, a Lyocell fiber production system is provided in front of the working station of the conveyor belt, and a water washing device is provided between the Lyocell fiber production system and the conveyor belt.

[0013] Further, the conveyor belt is sleeved on a driving roller for driving the conveyor belt.

[0014] Further, there are supporting rollers under the conveyor belt for supporting the weight of the conveyor belt and Lyocell fibers to reduce belt wear. Preferably, there are multiple supporting rollers evenly distributed under the conveyor belt.

[0015] Further, there are also tension rollers under the conveyor belt for controlling the tension of the conveyor belt. Preferably, there are two tension rollers distributed at both ends under the conveyor belt.

[0016] Furthermore, a chitosan solution receiving tank is provided below the chitosan solution spraying section. The chitosan solution receiving tank is connected to the chitosan solution spraying device to achieve effective collection and recycling of the chitosan solution;

[0017] An alkali solution receiving tank is provided below the alkali solution spraying section. The alkali solution receiving tank is connected to the alkali solution spraying device to achieve effective collection and recycling of the alkali solution;

[0018] A water receiving tank I is provided below the water spraying section I. The water receiving tank I is connected to the water spraying device I to achieve effective collection and recycling of water;

[0019] A sodium alginate solution receiving tank is provided below the sodium alginate solution spraying section. The sodium alginate solution receiving tank is connected to the sodium alginate solution spraying device to achieve effective collection and recycling of the sodium alginate solution;

[0020] A crosslinking solution receiving tank is provided below the crosslinking solution spraying section. The crosslinking solution receiving tank is connected to the crosslinking solution spraying device to achieve effective collection and recycling of the crosslinking solution;

[0021] A water receiving tank II is provided below the water spraying section II. The water receiving tank II is connected to the water spraying device II to achieve effective collection and recycling of water.

[0022] In this technical solution, the positional relationships such as "upper", "in sequence", "front side of the work station", "rear side of the work station", "between", "above the work station", "lower side", "both ends", "below" are defined according to the actual usage conditions, which are common terms in this technical field and also common terms for those skilled in the art during actual use.

[0023] In the description of this technical solution, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "provided with", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this technical solution can be understood according to specific situations.

[0024] Adopting this technical solution brings the following beneficial technical effects:

[0025] In the present utility model, the conveyor mesh belt includes a chitosan solution spraying section, an alkali solution spraying section, a water spraying section I, an alginate solution spraying section, a crosslinking solution spraying section, and a water spraying section II arranged in sequence, as well as steps for specific positions of each pressure roller group; in addition, corresponding solution spraying devices are provided for the corresponding spraying sections, ensuring that this preparation system not only better cooperates with the production process of antibacterial and flame-retardant lyocell fibers, ensuring continuous and industrial production of antibacterial and flame-retardant lyocell fibers; moreover, it also ensures that the fibers have excellent antibacterial properties and good flame-retardant properties, and at the same time, ensures the stability of the functional fiber production process, and the involved preparation has industrial application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the equipment layout diagram in the present utility model;

[0027] In the figure, 1. Conveyor mesh belt, 2. Chitosan solution spraying device, 3. Alkali solution spraying device, 4. Water spraying device I, 5. Alginate solution spraying device, 6. Crosslinking solution spraying device, 7. Water spraying device II, 8. Pressure roller group, 9. Driving roller, 10. Tension roller, 11. Chitosan solution receiving tank, 12. Alkali solution receiving tank, 13. Water receiving tank I, 14. Alginate solution receiving tank, 15. Crosslinking solution receiving tank, 16. Water receiving tank II, 17. Supporting roller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] Embodiment 1

[0030] This embodiment provides: A preparation system suitable for antibacterial and flame-retardant lyocell fibers, which better cooperates with the preparation process of antibacterial and flame-retardant lyocell fibers, and this preparation system has strong adaptability and ensures good stability of the preparation process. Specifically as follows:

[0031] A preparation system suitable for antibacterial and flame-retardant lyocell fibers, such as Figure 1As shown in the figure, it includes a conveyor belt 1 and at least seven pressure roller groups 8 distributed on the conveyor belt. The conveyor belt 1 includes a chitosan solution spraying section, an alkali solution spraying section, a water spraying section I, an alginate solution spraying section, a crosslinking solution spraying section, and a water spraying section II arranged in sequence. There is a pressure roller group 8 for squeezing water on the front side of the working station of the chitosan solution spraying section. There is a pressure roller group 8 for squeezing unadsorbed chitosan between the chitosan solution spraying section and the alkali solution spraying section. There is a pressure roller group 8 for squeezing unreacted alkali solution between the alkali solution spraying section and the water spraying section I. There is a pressure roller group 8 for squeezing water between the water spraying section I and the alginate solution spraying section. There is a pressure roller group 8 for squeezing unadsorbed alginate between the alginate solution spraying section and the crosslinking solution spraying section. There is a pressure roller group 8 for squeezing unreacted crosslinking solution between the crosslinking solution spraying section and the water spraying section II. There is a pressure roller group 8 for squeezing water on the rear side of the working station of the water spraying section II;

[0032] In addition, there is a chitosan solution spraying device 2 above the working station of the chitosan solution spraying section, an alkali solution spraying device 3 above the working station of the alkali solution spraying section, a water spraying device I 4 above the working station of the water spraying section I, an alginate solution spraying device 5 above the working station of the alginate solution spraying section, a crosslinking solution spraying device 6 above the working station of the crosslinking solution spraying section, and a water spraying device II 7 above the working station of the water spraying section II.

[0033] Example 2

[0034] On the basis of Example 1, the raw material Lyocell fiber involved can be directly purchased commercially or prepared by oneself. If it is prepared by oneself, then the layout of the production line involved includes:

[0035] There is a Lyocell fiber production system on the front side of the working station of the conveyor belt 1, and a water washing device is provided between the Lyocell fiber production system and the conveyor belt 1. Among them, the Lyocell fiber production system can adopt conventional technologies in the existing ones.

[0036] Example 3

[0037] On the basis of Examples 1-2, in this example, the conveyor belt 1 is further defined to further illustrate the present invention.

[0038] The conveyor belt 1 is sleeved on a driving roller 9 for driving the conveyor belt 1;

[0039] There are supporting rollers 17 under the conveyor belt 1 for supporting the weight of the conveyor belt 1 and the Lyocell fiber to reduce belt wear. Preferably, there are multiple supporting rollers 17, which are evenly distributed under the conveyor belt 1.

[0040] There are also tension rollers 10 under the conveyor belt 1 for controlling the tension of the conveyor belt 1. Preferably, there are two tension rollers 10, which are distributed at both ends under the conveyor belt 1.

[0041] Example 4

[0042] On the basis of Examples 1 - 3, in order to ensure the stable operation of the production line of antibacterial and flame - retardant Lyocell fibers, and to realize the circulation, recovery and reuse of the corresponding spraying liquid, it is further defined that:

[0043] A chitosan solution receiving tank 11 is provided below the chitosan solution spraying section. The chitosan solution receiving tank 11 is connected to the chitosan solution spraying device 2 to achieve the effective collection and recycling of the chitosan solution;

[0044] An alkali solution receiving tank 12 is provided below the alkali solution spraying section. The alkali solution receiving tank 12 is connected to the alkali solution spraying device 3 to achieve the effective collection and recycling of the alkali solution;

[0045] A water receiving tank I 13 is provided below the water spraying section I. The water receiving tank I 13 is connected to the water spraying device I 4 to achieve the effective collection and recycling of water;

[0046] A sodium alginate solution receiving tank 14 is provided below the sodium alginate solution spraying section. The sodium alginate solution receiving tank 14 is connected to the sodium alginate solution spraying device 5 to achieve the effective collection and recycling of the sodium alginate solution;

[0047] A cross - linking liquid receiving tank 15 is provided below the cross - linking liquid spraying section. The cross - linking liquid receiving tank 15 is connected to the cross - linking liquid spraying device 6 to achieve the effective collection and recycling of the cross - linking liquid;

[0048] A water receiving tank II 16 is provided below the water spraying section II. The water receiving tank II 16 is connected to the water spraying device II 7 to achieve the effective collection and recycling of water.

[0049] In addition, for each device involved in this preparation system:

[0050] The conveyor mesh belt 1: Specifically, a stainless - steel conveyor mesh belt can be used for laying and transporting Lyocell fibers;

[0051] The chitosan solution spraying device 2: It is used to spray the prepared chitosan solution onto Lyocell fibers, and the chitosan solution evenly wraps on the surface of Lyocell fibers;

[0052] The alkali solution spraying device 3: Among them, the alkali solution can specifically be sodium hydroxide solution. The alkali solution spraying device 3 is used to spray the prepared alkali solution onto Lyocell fibers to solidify the chitosan solution evenly wrapped on the surface of Lyocell fibers, so as to form an antibacterial layer on the fiber surface;

[0053] The water spraying device I 4: It is used to wash and remove the unreacted alkali solution on the fiber surface;

[0054] Sodium alginate solution spraying device 5: It is used to spray the prepared sodium alginate solution onto the Lyocell fibers, so that the sodium alginate solution evenly wraps on the surface of the Lyocell fibers;

[0055] Crosslinking solution spraying device 6: Among them, the crosslinking solution can specifically be a calcium chloride solution. The crosslinking solution spraying device 6 is used to spray the prepared crosslinking solution onto the Lyocell fibers. Ca in the crosslinking solution 2+ is used to crosslink the sodium alginate solution evenly wrapped on the surface of the Lyocell fibers, so that it solidifies, thereby forming a flame retardant layer;

[0056] Water spraying device II 7: It is used to wash and remove the unreacted crosslinking solution on the fiber surface;

[0057] Press roller: It is used to squeeze and remove the excessive chitosan solution, alkali solution, sodium alginate solution, crosslinking solution and water;

[0058] Drive roller 9: It is used for the transmission of the conveyor belt 11;

[0059] Tension roller 10: It is used to control the tension of the conveyor belt 11;

[0060] Chitosan solution receiving tank 11: It is used to recover the chitosan solution squeezed out by the press roller;

[0061] Alkali solution receiving tank 12: It is used to recover the alkali solution squeezed out by the press roller;

[0062] Water receiving tank I 13: It is used to recover the washing water containing alkali squeezed out by the press roller;

[0063] Sodium alginate solution receiving tank 14: It is used to recover the sodium alginate solution squeezed out by the press roller;

[0064] Crosslinking solution receiving tank 15: It is used to recover the crosslinking solution squeezed out by the press roller;

[0065] Water receiving tank II 16: It is used to recover the washing water containing crosslinking agent squeezed out by the press roller;

[0066] Support roller 17: It is used to support the weight of the conveyor belt 11 and the Lyocell fibers, and reduce the wear of the conveyor belt 1.

[0067] Example 5

[0068] Based on Examples 1-4, this example provides: A preparation method of antibacterial and flame retardant Lyocell fibers, and the specific steps are as follows:

[0069] 1) Preparation of Lyocell fibers

[0070] After crushing the cellulose pulp, it is dissolved in an aqueous solution of N-methylmorpholine-N-oxide (NMMO) to control the formation of a cellulose solution with a concentration of 12.0 - 14.0 wt%. Then, the cellulose solution is filtered and processed by dry-jet wet spinning to obtain a Lyocell fiber bundle.

[0071] The obtained Lyocell fiber bundle is washed with water and cut to control the resulting Lyocell fiber (staple fiber) to have a length of 30 - 60 mm, a dry breaking strength of ≥4.5 cN / dtex, and a dry breaking elongation of ≥18%.

[0072] Here, the length of the Lyocell fiber is limited to 30 - 60 mm, and the specific specifications are determined according to actual needs. For example, the length specifications of Lyocell staple fiber products are 38 mm or 42 mm.

[0073] 2) Pretreatment: Web laying, dehydration

[0074] The obtained Lyocell fiber is evenly laid on a conveyor mesh belt. Then, a pressure roller is used to squeeze and dehydrate the Lyocell fiber to control the resulting Lyocell fiber to have a water content of 30 - 50%.

[0075] 3) Chitosan solution spraying, squeezing

[0076] A chitosan solution with a concentration of 0.5 - 2.0 wt% and a temperature of 20 - 50 °C is added to a chitosan solution spraying device to spray the Lyocell fiber on the conveyor mesh belt. Then, a pressure roller is used to squeeze the Lyocell fiber to remove the unadsorbed chitosan (the chitosan solution after pressure roller squeezing is recovered and recycled through a receiving tank), and the resulting Lyocell fiber with a chitosan solution content of 50 - 60% is controlled.

[0077] 4) NaOH solution spraying, squeezing

[0078] A NaOH solution with a concentration of 0.1 - 1.0 wt% and a temperature of 20 - 30 °C is added to a NaOH solution spraying device to spray the Lyocell fiber on the conveyor mesh belt. Then, a pressure roller is used to squeeze the Lyocell fiber to remove the unreacted NaOH (the NaOH solution after pressure roller squeezing is recovered and recycled through a receiving tank), and the resulting Lyocell fiber with a NaOH solution content of 30 - 50% is controlled.

[0079] 5) Washing with water, dehydration

[0080] The Lyocell fiber on the conveyor mesh belt is sprayed with water through a water spraying device, that is, the Lyocell fiber is washed with water to remove the unreacted NaOH remaining on the surface of the Lyocell fiber. Then, it is squeezed and dehydrated to control the resulting Lyocell fiber to have a water content of 30 - 50%.

[0081] 6) Sodium alginate solution spraying, squeezing

[0082] Add a sodium alginate solution with a concentration of 0.5 - 2.0 wt% and a temperature of 40 - 50 °C to the sodium alginate solution spraying device, and spray it on the Lyocell fibers on the conveyor mesh belt; then, use a pressure roller to squeeze the Lyocell fibers to remove the unadsorbed sodium alginate (the sodium alginate solution after being squeezed by the pressure roller is recovered and recycled through a receiving tank), and control to obtain Lyocell fibers with a sodium alginate solution content of 50 - 60%;

[0083] 7) Spraying and squeezing with CaCl₂ solution

[0084] Add a CaCl₂ solution with a concentration of 0.1 - 1.0 wt% and a temperature of 20 - 30 °C to the CaCl₂ solution spraying device, and spray it on the Lyocell fibers on the conveyor mesh belt; then, use a pressure roller to squeeze the Lyocell fibers to remove the unreacted CaCl₂ (the CaCl₂ solution after being squeezed by the pressure roller is recovered and recycled through a receiving tank), and control to obtain Lyocell fibers with a CaCl₂ solution content of 30 - 50%;

[0085] Among them, for the crosslinking agent, in addition to the CaCl₂ solution, an MgCl₂ solution or an FeCl₃ solution can also be used. However, considering factors such as cost and impact on the human body, the CaCl₂ solution is preferably used as the crosslinking agent;

[0086] 8) Post-treatment: Re-washing with water

[0087] Through a water spraying device, spray the Lyocell fibers on the conveyor mesh belt, that is, wash the Lyocell fibers with water to remove the unreacted CaCl₂ remaining on the surface of the Lyocell fibers; then, squeeze and dehydrate to control to obtain Lyocell fibers with a water content of 30 - 50%, that is, antibacterial and flame-retardant Lyocell fibers are obtained;

[0088] Among them, the water washing temperature is 20 - 30 °C. In addition, in order to better cooperate with the post-treatment process of antibacterial and flame-retardant Lyocell fibers, such as oiling, drying, etc., control to obtain Lyocell fibers with a water content of 30 - 50%.

[0089] Furthermore, the conveying speed of the conveyor mesh belt is 0.1 - 5.0 m / min. With this limitation of the conveying speed, it can better ensure that during the stable and orderly conveying process of Lyocell fibers, operations such as web laying, dehydration, spraying and squeezing with chitosan solution, spraying and squeezing with NaOH solution, water washing, re-dehydration, spraying and squeezing with sodium alginate solution, spraying and squeezing with CaCl₂ solution, and re-water washing are completed simultaneously.

[0090] Furthermore, the product performance indicators of the antibacterial and flame-retardant lyocell fiber include: dry breaking strength ≥ 3.8 cN / dtex, dry breaking elongation ≥ 12.0%, limiting oxygen index LOI > 27%, antibacterial rate against Staphylococcus aureus ≥ 92%, antibacterial rate against Escherichia coli ≥ 92%, and antibacterial rate against Candida albicans ≥ 90%.

[0091] In addition, in this preparation method, the chemical reaction formulas / mechanisms involved include:

[0092] I. Production process of lyocell fiber: N-methylmorpholine-N-oxide monohydrate (NMMO) can combine with the hydroxyl groups on cellulose to form hydrogen bonds, and then dissolve cellulose. The process includes: First, mix cellulose pulp with NMMO aqueous solution, and add appropriate antioxidants, additives, etc. Under vacuum, heating, and stirring, cellulose gradually dissolves to form a spinning solution; Second, the spinning solution is dry-jet wet-spun, and the spinning filaments are solidified and formed in a coagulation bath under a stretching state; Finally, the fibers are subjected to post-treatments such as washing, oiling, and drying to obtain lyocell fibers;

[0093] Formation of chitosan solution: In an acidic aqueous solution, the amino groups on the molecular chain of chitosan are protonated to generate -NH3 + ions, resulting in the molecular chain carrying a large amount of positive charges. Through electrostatic repulsion between molecular chains, they are evenly dispersed in the acidic aqueous solution, thus realizing the dissolution of chitosan. By stirring, a chitosan solution can be obtained;

[0094] Regeneration of chitosan: In an alkaline coagulation bath (usually sodium hydroxide solution), the protonated -NH3 + ions will neutralize with -OH to reform amino groups. In this way, the electrostatic interaction between chitosan molecular chains disappears, and the molecular chains re-aggregate and precipitate, thus regenerating and forming;

[0095] Formation of sodium alginate solution: Sodium alginate is itself a water-soluble substance. After adding water, the alginate anions carry negative charges, and the sodium alginate molecular chains are evenly dispersed in water through electrostatic repulsion. By stirring, a sodium alginate solution can be obtained;

[0096] Regeneration of sodium alginate: In an aqueous solution of Mg 2+ , Fe 3+ , Ca 2+ ions, the alginate anions will undergo an ion cross-linking reaction with Mg 2+ , Fe 3+ , Ca 2+ ions to form water-insoluble calcium alginate, magnesium alginate, and iron alginate, thus regenerating and forming.

[0097] The above are the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A preparation system applicable to antibacterial and flame-retardant Lyocell fibers, characterized in that, It includes a conveyor mesh belt (1) and at least seven pressure roller groups (8) distributed on the conveyor mesh belt. The conveyor mesh belt (1) includes a chitosan solution spraying section, an alkali solution spraying section, a water spraying section I, an alginate solution spraying section, a crosslinking solution spraying section, and a water spraying section II arranged in sequence. A pressure roller group (8) for squeezing water is provided on the front side of the station of the chitosan solution spraying section. A pressure roller group (8) for squeezing unadsorbed chitosan is provided between the chitosan solution spraying section and the alkali solution spraying section. A pressure roller group (8) for squeezing unreacted alkali solution is provided between the alkali solution spraying section and the water spraying section I. A pressure roller group (8) for squeezing water is provided between the water spraying section I and the alginate solution spraying section. A pressure roller group (8) for squeezing unadsorbed alginate is provided between the alginate solution spraying section and the crosslinking solution spraying section. A pressure roller group (8) for squeezing unreacted crosslinking solution is provided between the crosslinking solution spraying section and the water spraying section II. A pressure roller group (8) for squeezing water is provided on the rear side of the station of the water spraying section II; A chitosan solution spraying device (2) is provided above the station of the chitosan solution spraying section. An alkali solution spraying device (3) is provided above the station of the alkali solution spraying section. A water spraying device I (4) is provided above the station of the water spraying section I. An alginate solution spraying device (5) is provided above the station of the alginate solution spraying section. A crosslinking solution spraying device (6) is provided above the station of the crosslinking solution spraying section. A water spraying device II (7) is provided above the station of the water spraying section II.

2. The preparation system for antibacterial and flame-retardant Lyocell fibers according to claim 1, characterized in that, A Lyocell fiber production system is provided on the front side of the station of the conveyor mesh belt (1). A water washing device is provided between the Lyocell fiber production system and the conveyor mesh belt (1).

3. The preparation system for antibacterial and flame-retardant lyocell fibers according to claim 2, characterized in that, The conveyor mesh belt (1) is sleeved on a driving roller (9).

4. The preparation system for antibacterial and flame-retardant Lyocell fibers according to claim 3, characterized in that, Below the conveyor mesh belt (1), there are supporting rollers (17) for supporting the weight of the conveyor mesh belt (1) and the Lyocell fiber.

5. The preparation system for antibacterial and flame-retardant lyocell fibers according to claim 4, characterized in that, There are multiple supporting rollers (17), which are evenly distributed below the conveyor mesh belt (1).

6. The preparation system for antibacterial and flame-retardant lyocell fibers according to claim 4, wherein, Below the conveyor mesh belt (1), there is also a tension roller (10) for controlling the tension of the conveyor mesh belt (1).

7. The preparation system for antibacterial and flame-retardant Lyocell fibers according to claim 6, characterized in that, There are two tension rollers (10), which are distributed at both ends below the conveyor mesh belt (1).

8. The preparation system for antibacterial and flame-retardant Lyocell fibers according to any one of claims 1-7, characterized in that, Below the chitosan solution spraying section, there is a chitosan solution receiving tank (11), and the chitosan solution receiving tank (11) is connected to the chitosan solution spraying device (2); Below the alkali solution spraying section, there is an alkali solution receiving tank (12), and the alkali solution receiving tank (12) is connected to the alkali solution spraying device (3); Below the water spraying section I, there is a water receiving tank I (13), and the water receiving tank I (13) is connected to the water spraying device I (4); Below the alginate solution spraying section, there is an alginate solution receiving tank (14), and the alginate solution receiving tank (14) is connected to the alginate solution spraying device (5); Below the crosslinking solution spraying section, there is a crosslinking solution receiving tank (15), and the crosslinking solution receiving tank (15) is connected to the crosslinking solution spraying device (6); Below the water spraying section II, there is a water receiving tank II (16), and the water receiving tank II (16) is connected to the water spraying device II (7).

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