A method for batch production of alginate hydrogel fibers by a novel gas-phase confinement method
The preparation of alginate hydrogel fibers by gas-phase confinement method solves the problems of crosslinking agent waste and pollution in wet spinning, realizes efficient and environmentally friendly fiber production, and improves fiber quality and functionality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2026-03-17
AI Technical Summary
Traditional wet spinning processes suffer from problems such as excessive crosslinking agent usage, severe waste liquid pollution, high production costs, and equipment blockage during the liquid-phase confinement process in the coagulation bath, which affect fiber quality and production continuity.
A gas-phase confinement method was adopted, which uses the gas phase to replace the liquid phase coagulation bath. Alginate hydrogel fibers were prepared by anionic alginate, cationic crosslinking agent and micro-nano powder coating material, which simplifies the process and reduces the use of crosslinking agent.
It significantly reduces the use of crosslinking agents, reduces environmental pollution, simplifies process steps, improves fiber uniformity and performance, endows fibers with a variety of high-value-added functions, such as photothermal conversion, moisture absorption and phase change energy storage, and broadens the application fields.
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Figure CN119663479B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of alginate fiber preparation technology, specifically to a novel gas-phase confinement method for the batch preparation of alginate hydrogel fibers. Background Technology
[0002] The development of traditional wet spinning technology has primarily focused on improving the tensile strength and flexibility of silk fabrics. Alginate fibers, due to their wide availability, non-toxicity, and biodegradability, are widely used in the textile industry. The basic process involves precisely merging the alginate spinning solution stream with other streams providing additional functions using an injection pump to form an alginate mixture. This mixture is then injected into a coagulation bath filled with a crosslinking agent. The coagulation bath gradually solidifies the alginate mixture into gel fibers through liquid-phase confinement, followed by a drying process to obtain the final product. The spinning process's advantages of simplicity, low cost, and ease of large-scale production make it a commonly used technology for preparing sodium alginate fibers.
[0003] While wet spinning offers numerous advantages in fiber preparation, the liquid-phase confinement coagulation process in the coagulation bath also presents several challenges. To maintain the steady state of the coagulation bath, wet spinning typically requires far more crosslinking agent than necessary for liquid-phase confinement. This not only increases production costs but also generates substantial amounts of wastewater, polluting the environment. As the crosslinking process continues, the concentration of the crosslinking agent in the coagulation bath gradually decreases. This change not only slows the crosslinking reaction rate but also affects the strength, flexibility, and tensile properties of the hydrogel fibers, leading to overall product quality instability. Furthermore, the reduced crosslinking agent concentration may disrupt the stable state of the coagulation bath, causing precipitation and localized phase separation, which can then clog the injection inlet, disrupting normal production. Such clogging not only affects production continuity but can also damage equipment, increasing maintenance and repair costs. Summary of the Invention
[0004] Conventional wet spinning focuses on imparting high-value-added functions to hydrogel fibers while maintaining stable mechanical properties. However, it cannot overcome problems such as increased production costs due to the large-scale use of coagulation bath reagents, wastewater pollution, and flocculation clogging of pipe openings. The proposed "vapor-phase confinement" method provides a research approach to solve this problem. The fundamental advantage of vapor-phase confinement in the preparation of alginate hydrogels lies in the conversion of the coagulation bath from excess liquid solvent to air. This significantly reduces the use of crosslinking agents and avoids environmental pollution from wastewater. Simultaneously, the hydrogel fibers can enter the drying stage without entering the coagulation bath, simplifying the process. Therefore, this application adopts the vapor-phase confinement approach in the hydrogel fiber spinning process, which helps to solve the problem of waste of coagulation bath reagents and simplifies the hydrogel fiber spinning process.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] A novel gas-phase confinement method for the mass production of alginate hydrogel fibers includes a hydrogel fiber shell and a powder coating on the surface of the hydrogel shell; the hydrogel fiber shell is prepared by combining anionic alginate and a crosslinking agent.
[0007] The anionic alginate content is 0.5%–10%; the cationic crosslinking agent content is 0.5%–20%; the water-based toughening agent content is 0.2%–5%; the outer powder coating content is 0.1%–5%; and the balance is water.
[0008] Furthermore, the viscosity of the mixed aqueous solution prepared by the anionic alginate and the aqueous toughening agent should be less than 5000 mPa·s.
[0009] Furthermore, the anionic alginate solute includes one or more of the following: alginic acid, sodium alginate, potassium alginate, calcium alginate, or magnesium alginate.
[0010] Furthermore, the cationic crosslinking agents are all divalent or higher metal ions, including Ca. 2+ Mg 2+ Zn 2+ 、Sr 2+ Cu 2+ Al 3+ or Fe 3+ If one or more of the following are used as cross-linking agents, the concentration of all cationic substances should be 0.2–3 mol / L.
[0011] Furthermore, the water-based toughening agent should contain one or more of agar, xanthan gum, dextran, silk fibroin, sericin, polyvinyl alcohol, or polyurethane, with a solid content of less than 5%.
[0012] Further, the powder coating is one or more of metal powder, metal oxide powder, inorganic non-metallic powder, or organic polymer powder, and the particle size is between 0.1 μm and 100 μm. Wherein:
[0013] The metal powder includes at least one of iron powder, copper powder, and gold powder;
[0014] The inorganic salt powder includes at least one of lithium chloride, sodium chloride, potassium chloride, and silver chloride;
[0015] The metal oxide powder includes at least one of iron(II,III) oxide, copper oxide, and titanium dioxide powder;
[0016] The inorganic non-metallic powder includes at least one of silicon dioxide, talc, mica powder, kaolin, graphene, and carbon nanotubes.
[0017] The organic polymer powder includes at least one of polypropylene, polytetrafluoroethylene, polydimethylsiloxane, and polystyrene.
[0018] A novel gas-phase confinement method for the batch preparation of alginate hydrogel fibers includes the following steps:
[0019] 1) After the alginate and water form a stable mixed solution, add the water-based toughening agent to the mixed aqueous solution.
[0020] 2) After continuously and uniformly adding a certain concentration of cationic crosslinking agent to the surface of the mixed aqueous solution, the mixture is uniformly pulled and drawn into filamentous hydrogel fibers under gas-phase confinement conditions.
[0021] 3) Attach one or more powder coatings to the surface of the hydrogel fiber.
[0022] 4) The hydrogel fibers are dried by heat convection and heat radiation.
[0023] 5) Collect the dried hydrogel fibers using a winding machine.
[0024] The aqueous toughening agent described in step 1) should not react with the cationic crosslinking agent or the reaction rate should be significantly lower than that of the alginate aqueous solution, and the mass fraction of the agent should preferably be similar to that of the alginate.
[0025] Furthermore, the gas phase confinement in step 2) should be a gas phase that is in direct contact with the surface of the mixed aqueous solution, including one or more of air, nitrogen, oxygen or rare gases.
[0026] Furthermore, when using multiple powder coatings as described in step 3), the powders can be premixed evenly before coating; if the outer coating powders are not convenient to be coated simultaneously due to different wettability, the hydrophilic powder can be mixed with a cationic crosslinking agent and then coated during lifting and traction.
[0027] Further, the thermal convection curing method in step 4) includes at least one of natural convection, oven drying, conveyor belt drying, fluidized bed drying, hot air drying, or air circulation drying. The thermal radiation curing method includes at least one of infrared radiation, ultraviolet radiation, laser radiation, microwave radiation, blue light irradiation, or visible light thermal radiation curing.
[0028] Furthermore, the hydrogel fiber collection in step 5) is achieved by one or more sets of rotating winding devices controlled by a single-phase motor, wherein the rotation speed control range of the rotating winding device is 5 to 500 r / min. The rotation method includes one of magnetic rotation, robotic arm rotation, roller rotation, or turntable rotation.
[0029] Furthermore, when using multiple sets of rotating winding devices, the maximum speed difference between the winding devices should be between 0.5 and 3 times.
[0030] Compared to the traditional wet spinning process, the beneficial effects achieved by the technical solution of this invention are:
[0031] 1. This invention provides a novel gas-phase confinement method for the mass production of alginate-based hydrogel fibers. These fibers utilize micro / nano-scale materials as the outer coating powder and alginate as the gel structure. The hydrogel employs a semi-coating structure to regulate the surface powder. During the hydrogel curing stage, the outer coating powder on the gel surface can migrate and rearrange as the gel shell expands or contracts, preventing localized powder agglomeration from affecting the uniformity of the hydrogel fibers.
[0032] 2. By using micro- and nano-sized powders as the outer coating material, high-value-added applications can be given to the obtained alginate hydrogel fibers at the microscale. For example, loading light-absorbing powders onto the hydrogel surface can endow the fibers with photothermal conversion properties, loading hydrophilic powders can endow the fibers with hygroscopic properties, and loading phase change materials can endow the fibers with phase change energy storage applications.
[0033] 3. Alginic acid-based materials are derived from natural seaweed. Using alginic acid as the main raw material for preparing hydrogel fibers offers advantages such as non-toxicity, good biocompatibility, abundant resources, and biodegradability. The finished fibers can effectively absorb and release moisture, helping to regulate humidity.
[0034] 4. This invention provides a novel gas-phase confinement method for the mass production of alginate hydrogel fibers. Its core advantage lies in replacing the traditional liquid-phase solvent coagulation bath with air, thereby significantly reducing the use of crosslinking agents. This not only solves the problems of solvent waste, waste liquid pollution, and pipe blockage associated with conventional coagulation baths, but also allows the hydrogel fibers to directly enter the drying process, simplifying the workflow. Attached Figure Description
[0035] Figure 1 Optical micrographs of sodium alginate fiber products with different mass ratios prepared according to the present invention.
[0036] Figure 2 Different mass ratios of Ca used in this invention 2+ Optical micrograph of sodium alginate filaments prepared with crosslinking agents.
[0037] Figure 3 These are optical micrographs of particles adhered to by different toughening agents used in this invention.
[0038] Figure 4 These are optical micrographs of particles adhered to by different toughening agents used in this invention, after being soaked in water for one week.
[0039] Figure 5 This is an optical micrograph of the sodium alginate fiber prepared in this invention, which, after drying, absorbs water and reverts to a gel state.
[0040] Figure 6 This is an electron micrograph of the sodium alginate gel fibers prepared in this invention after drying.
[0041] Figure 7 This is an electron micrograph of the sodium alginate gel fiber prepared in this invention after being immersed in a water bath.
[0042] Figure 8 The effect of different amounts of toughening agents added in this invention on the tensile strength of sodium alginate fibers is shown.
[0043] Figure 9 This is a schematic diagram of a novel gas-phase confinement method for the mass production of alginate hydrogel fibers according to the present invention. In the diagram: ① is a sodium alginate mixed solution; ② is a cationic crosslinking agent; ③ is the outer coating material; ④ represents particles adhering to the hydrogel surface. Detailed Implementation
[0044] To more clearly illustrate the technical problems, solutions, and effects of the present invention, the accompanying drawings are provided. Figure 9 Detailed descriptions and examples are provided. Percentages in the examples are by weight, and all materials and chemicals are commercially available or prepared using publicly disclosed methods. The examples are for illustrative purposes only and do not limit the scope of the invention.
[0045] Example 1
[0046] This embodiment provides a novel gas-phase confinement method for the mass preparation of alginate hydrogel fibers. The crosslinking agent CaCl2 is kept constant at 2%, and sodium alginate in different mass ratios is used as the main body of the hydrogel fibers. The specific preparation steps are as follows:
[0047] Step 1: Place 2g, 3g, 4g, 5g and 6g of sodium alginate in beakers, add water to 100g to prepare sodium alginate aqueous solutions with different mass fractions.
[0048] Step 2: Uniformly drop 2% CaCl2 aqueous solution onto the surface of the above solution to ensure full contact and reaction. Then, vertically pull the mixed solution with the added CaCl2, maintaining stability and a uniform speed to gradually stretch it until long and uniform hydrogel fibers are formed.
[0049] Step 3: After drying the samples prepared in Step 2, transparent hydrogel fibers with different mass ratios of sodium alginate are obtained, such as... Figure 1 As shown.
[0050] Example 2
[0051] This embodiment provides a novel gas-phase confinement method for the mass preparation of alginate hydrogel fibers. Sodium alginate is used as the main component of the hydrogel fibers, with a constant mass ratio of 2%. CaCl2 is used as a crosslinking agent in different mass ratios. The specific preparation steps are shown below:
[0052] Step 1: Place 2g of sodium alginate in a beaker and add water to 100g to prepare an aqueous solution of sodium alginate.
[0053] Step 2: Uniformly drop 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, and 4% CaCl2 aqueous solutions onto the surface of the above solution, allowing them to fully contact and react. Then, vertically pull the mixed solution containing the dropped CaCl2, maintaining stability and a uniform speed to gradually stretch it until long and uniform hydrogel fibers are formed.
[0054] Step 3: After drying the samples prepared in Step 2, transparent hydrogel fiber products with different mass ratios of crosslinking agents are obtained, such as... Figure 2 As shown.
[0055] Example 3
[0056] This embodiment provides a novel gas-phase confinement method for the mass production of alginate hydrogel fibers. Sodium alginate is used as the main component of the hydrogel fibers, and CaCl2 solution is used as the crosslinking agent, with both maintained at a constant mass ratio of 2%. Waterborne polyurethane (WPU) and polyvinyl alcohol (PVA) are used as toughening agents. The specific preparation steps are as follows:
[0057] Step 1: Place 2g of sodium alginate in a beaker, add water to 50g to prepare a 4% sodium alginate stock solution. Repeat the process to obtain multiple portions of sodium alginate stock solution.
[0058] Step 2: Add different mass fractions of WPU and PVA as toughening agents to the multiple portions of sodium alginate stock solution prepared in Step 1, and then add water to 100g to obtain a sodium alginate mixture.
[0059] Step 3: Uniformly drop 2% CaCl2 aqueous solution onto the surface of the above mixture to ensure full contact and reaction. Then, vertically pull the mixture containing the added CaCl2 solution, maintaining stability and a uniform speed to gradually stretch it until long and uniform hydrogel fibers are formed.
[0060] Step 4: Evenly drop 2% CaCl2 aqueous solution onto the surface of the above mixture to ensure full contact and reaction. Then, vertically pull the mixture containing the added CaCl2 solution, maintaining stability and a uniform speed to gradually stretch it until long and uniform hydrogel fibers are formed.
[0061] Step 5: Attach micro / nano-scale particles to the surface of the different hydrogel fibers obtained in Step 4, and after drying, obtain hydrogel fiber products prepared with different toughening agents, such as... Figure 3 As shown.
[0062] Step 6: After soaking the hydrogel fiber product obtained in Step 5 in water for one week, the hydrogel fiber product with particle adhesion properties is obtained by morphology screening, such as... Figure 4 As shown.
[0063] Example 4
[0064] This embodiment provides a novel gas-phase confinement method for the mass preparation of alginate hydrogel fibers. Sodium alginate (5% by mass) is used as the main body of the hydrogel fibers, while the crosslinking agent CaCl2 is kept constant at 2%. The specific preparation steps are as follows:
[0065] Step 1: Place 5g of sodium alginate in a beaker and add water to 100g to prepare an aqueous solution of sodium alginate.
[0066] Step 2: Uniformly drop 2% CaCl2 aqueous solution onto the surface of the above solution to ensure full contact and reaction. Then, vertically pull the mixed solution with the added CaCl2, maintaining stability and a uniform speed to gradually stretch it until long and uniform hydrogel fibers are formed.
[0067] Step 3: The transparent hydrogel fiber obtained by drying the sample prepared in step 2.
[0068] Step 4: After drying in Step 3, the hydrogel fibers are immersed in a room temperature water bath to regenerate hydrogel fibers, such as... Figure 5 As shown.
[0069] Example 5
[0070] This embodiment provides a novel gas-phase confinement method for the mass preparation of alginate hydrogel fibers. Sodium alginate (2% by mass) is used as the main body of the hydrogel fibers, and the crosslinking agent CaCl2 is kept constant at 2%. The specific preparation steps are as follows:
[0071] Step 1: Place 2g of sodium alginate in a beaker and add water to 100g to prepare an aqueous solution of sodium alginate.
[0072] Step 2: Uniformly drop 2% CaCl2 aqueous solution onto the surface of the above solution to ensure full contact and reaction. Then, vertically pull the mixed solution with the added CaCl2, maintaining stability and a uniform speed to gradually stretch it until long and uniform hydrogel fibers are formed.
[0073] Step 3: After the sample prepared in Step 2 is naturally dried, the resulting transparent hydrogel fibers are photographed using a scanning electron microscope, such as... Figure 6 As shown.
[0074] Example 6
[0075] This embodiment provides a novel gas-phase confinement method for the mass preparation of alginate hydrogel fibers. Sodium alginate (2% by mass) is used as the main body of the hydrogel fibers, and the crosslinking agent CaCl2 is kept constant at 2%. The specific preparation steps are as follows:
[0076] Step 1: Place 2g of sodium alginate in a beaker and add water to 100g to prepare an aqueous solution of sodium alginate.
[0077] Step 2: Uniformly drop 2% CaCl2 aqueous solution onto the surface of the above solution to ensure full contact and reaction. Then, vertically pull the mixed solution with the added CaCl2, maintaining stability and a uniform speed to gradually stretch it until long and uniform hydrogel fibers are formed.
[0078] Step 3: Soak the hydrogel fibers prepared in Step 2 in a room temperature water bath for one hour.
[0079] Step 3: After the sample prepared in Step 3 is naturally dried, the resulting transparent hydrogel fibers are photographed using a scanning electron microscope, such as... Figure 7 As shown.
[0080] Example 7
[0081] This embodiment provides a novel gas-phase confinement method for the mass production of alginate-based hydrogel fibers. Sodium alginate is used as the main component of the hydrogel fibers, and CaCl2 solution is used as the crosslinking agent, with the mass ratio maintained at 2%. Waterborne polyurethane (WPU) with different mass ratios is used as a toughening agent. The specific preparation steps are shown below:
[0082] Step 1: Place 2g of sodium alginate in a beaker, add water to 50g to prepare a 4% sodium alginate stock solution. Repeat the process to obtain multiple portions of sodium alginate stock solution.
[0083] Step 2: Add WPU of different mass fractions as toughening agent to the multiple portions of sodium alginate stock solution prepared in Step 1, and then add water to 100g to obtain sodium alginate mixture.
[0084] Step 3: Uniformly drop 2% CaCl2 aqueous solution onto the surface of the above mixture to ensure full contact and reaction. Then, vertically pull the mixture containing the added CaCl2 solution, maintaining stability and a uniform speed to gradually stretch it until long and uniform hydrogel fibers are formed.
[0085] Step 4: Measure the tensile strength of the hydrogel fibers with different mass ratios of WPU added in Step 3 using a universal testing machine. Figure 8 As shown.
[0086] The purpose of this invention is to provide a novel gas-phase confinement method for the efficient and mass production of alginate hydrogel fibers. This method utilizes micro / nano-scale materials as the outer coating powder, combined with alginate as the gel substrate, aiming to address the problem of insufficient uniformity in existing hydrogel fibers. By controlling the migration and rearrangement of the outer coating powder during the hydrogel curing stage, the overall quality and performance of the hydrogel fibers are significantly improved.
[0087] The technical solution of this invention relates to the design of a semi-encapsulated structure. By adjusting the distribution of powder on the hydrogel surface, it ensures that the outer encapsulated powder can effectively rearrange itself to accommodate the expansion or contraction of the gel shell during the hydrogel curing process. Simultaneously, this invention introduces a gas-phase confinement method to replace the traditional liquid-phase solvent coagulation bath, significantly reducing the use of crosslinking agents and lowering environmental pollution and resource waste. Furthermore, this method simplifies the production process, allowing hydrogel fibers to directly enter the drying stage, thereby improving production efficiency.
[0088] The alginate hydrogel fibers prepared by the novel gas-phase confinement method exhibit excellent physical and chemical properties. These fibers are not only non-toxic, biocompatible, and biodegradable, but also effectively absorb and release moisture, thereby regulating humidity. Furthermore, the application of micro / nano-scale powders endows the fibers with various high-value-added functions, such as photothermal conversion performance, excellent hygroscopicity, and phase change energy storage capacity, greatly expanding their application potential in medical, environmental protection, and construction fields.
[0089] The above specific embodiments are merely for understanding the technical concept and solution of the present invention, and the given examples do not cover all material, dosage, and process conditions selected for the technical solution of the present invention. These embodiments are merely examples and do not limit the scope of protection of the present invention. Any modifications, equivalent substitutions, or improvements within the spirit and principles of the present invention are included within the scope of protection. The scope of the present invention should be defined by the claims, and any modifications or alterations made by those skilled in the art based on the teachings of the present invention are within the scope of protection.
Claims
1. A novel gas-phase confinement method for batch production of alginate hydrogel fibers, characterized in that, The hydrogel fiber shell comprises a hydrogel shell and a powder coating on the surface of the hydrogel shell. The hydrogel fiber shell is formed by contacting anionic alginate and a cross-linking agent in the gas phase, and comprises the following components by mass percentage: 0.5%-10% of anionic alginate solute; 0.5%-20% of cationic cross-linking agent; 0.2%-5% of aqueous toughening agent; 0.1%-5% of outer powder coating; and the balance of water. The outer powder coating comprises at least one of metal powder, inorganic salt powder, metal oxide powder, inorganic non-metal powder or organic polymer powder. The hydrogel fiber is obtained by the following method: The method comprises a hydrogel gas phase limiting step, a hydrogel solidification step and a hydrogel batch collection step, wherein the hydrogel gas phase limiting step comprises: (1) preparing a mixed aqueous solution of anionic alginate solute and aqueous toughening agent; (2) adding cationic cross-linking agent dropwise on the surface of the mixed aqueous solution in step (1); (3) continuously pulling the mixed solution with added cross-linking agent in step (2) to form a batch of fibers in the gas phase; (4) adhering the outer powder coating on the surface of the hydrogel after the batch of fibers in step (3); In the hydrogel solidification step, the solidification process is at least one of a thermal convection solidification method or a thermal radiation solidification method; The hydrogel batch collection step is completed by a rotating winding device controlled by one or more single-phase motors.
2. Novel gas phase confined method for batch production of alginate hydrogel fibers according to claim 1, characterized in that, The anionic alginate solute comprises one or more of alginic acid, sodium alginate, potassium alginate, calcium alginate or magnesium alginate.
3. Novel gas phase confined method for batch production of alginate hydrogel fibers according to claim 1, characterized by, The cationic crosslinker is one or several of the divalent and higher metal ions, Ca 2+ , Mg 2+ , Zn 2+ , Sr 2+ , Cu 2+ , Al 3+ or Fe 3+ .
4. The novel gas phase confined method for batch production of alginate hydrogel fibers according to claim 1, characterized by, The aqueous toughening agent is one or more of agar, xanthan gum, dextran, silk fibroin, sericin, polyvinyl alcohol or polyurethane, with a solid content of less than 5%.
5. The novel gas phase limiting method for batch preparation of alginate hydrogel fibers according to claim 1, wherein The metal powder comprises at least one of iron powder, copper powder or gold powder; The inorganic salt powder comprises at least one of lithium chloride, sodium chloride, potassium chloride or silver chloride; The metal oxide powder comprises at least one of ferroferric oxide, copper oxide or titanium dioxide powder; The inorganic non-metal powder comprises at least one of silicon dioxide, talc powder, mica powder, kaolin or graphene or carbon nanotube; The organic polymer powder comprises at least one of polypropylene, polytetrafluoroethylene, polydimethylsiloxane or polystyrene.
6. The novel gas phase confined method for batch production of alginate hydrogel fibers according to claim 1, characterized by, The gas phase conditions for the preparation of the hydrogel fibers are one or more of air, nitrogen, oxygen or noble gas.
7. The novel gas phase confined method for batch production of alginate hydrogel fibers according to claim 1, characterized by, The thermal convection solidification method is at least one of natural convection, oven drying, conveyor belt drying, fluidized bed drying, hot air drying or air circulation drying method; and the thermal radiation solidification method is at least one of infrared radiation, ultraviolet radiation, laser radiation, microwave radiation, blue light irradiation or visible light thermal radiation solidification method.
8. The novel gas phase confined method for batch production of alginate hydrogel fibers according to claim 1, characterized by, The rotating mode of the rotating winding device comprises one of magnetic rotation, mechanical arm rotation, roller rotation or turntable rotation; and the rotating speed control range of the rotating winding device is 5-500 r / min.
9. The novel gas phase confined method for batch production of alginate hydrogel fibers according to claim 1, characterized by, When multiple rotating winding devices are used, the maximum rotating speed difference between the winding devices should be between 0.5 and 3 times.
Citation Information
Patent Citations
Functional filler / sodium alginate composite fiber and preparation method thereof
CN118727196A