Chemical treatment method for improving strength of viscose staple fibers
Through chemical treatment methods using alkali solution, reinforcing treatment liquid, nanocellulose and acid solution, the problem of insufficient strength of viscose staple fibers was solved, and efficient and low-cost strength improvement was achieved while maintaining other properties of the fiber.
Patent Information
- Application Number
- CN202511169688.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2025-10-10
AI Technical Summary
Viscose staple fiber has weak strength, and traditional processes have little effect on improving it and are costly, which affects its application in textile and other fields.
The chemical method of alkaline pretreatment, strengthening treatment solution, nanocellulose and acid treatment is used to gradually strengthen the structure of viscose staple fibers, introduce new functional groups and enhance interfacial bonding strength, and finally solidify the structure.
It significantly improves the strength and durability of viscose staple fibers, reduces production costs, and maintains other fiber properties such as moisture absorption and feel.
Smart Images
Figure CN120759098A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of functional fibers, and particularly relates to a chemical treatment method for improving the strength of viscose staple fibers. Background Art
[0002] Viscose staple fiber is a regenerated cellulose fiber with excellent moisture absorption, dyeability and spinnability, and is therefore widely used in textiles, non-woven fabrics and composite materials. However, the strength of viscose staple fiber is relatively weak.
[0003] The strength of viscose staple fiber mainly depends on the degree of polymerization, crystallinity and bonding force between molecular chains of cellulose. In traditional processes, the strength of viscose staple fiber is mostly improved through physical stretching or high-concentration alkali treatment. The process is complicated, the production cost is high, the strength improvement is not obvious, and the performance of the treated fiber in terms of feel, color, etc. is greatly reduced, which restricts the demand for the use of viscose staple fiber related products. Therefore, it is necessary to improve the existing reinforcement process of viscose staple fiber to effectively solve the problem of insufficient strength improvement of viscose staple fiber by existing technology. Summary of the Invention
[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a chemical treatment method for improving the strength of viscose staple fibers, so as to solve the problem that the prior art does not significantly improve the strength of viscose staple fibers.
[0005] To achieve the above object, the present invention provides the following technical solutions:
[0006] A chemical treatment method for improving the strength of viscose staple fibers, comprising the following steps:
[0007] pretreating viscose staple fibers with alkali solution to obtain relaxed viscose staple fibers;
[0008] treating the relaxed viscose staple fibers with a reinforcement treatment liquid to obtain reinforced viscose staple fibers;
[0009] treating the reinforced viscose staple fibers with nanocellulose to obtain reinforced viscose staple fibers;
[0010] The reinforced viscose staple fibers are treated with an acid solution to obtain high-strength viscose staple fibers.
[0011] Preferably, in the viscose staple fiber pretreatment using alkali solution, the viscose staple fiber is immersed in a 3% to 5% sodium hydroxide solution with a bath ratio of 1:15, and treated at 60 to 80°C for 20 to 30 minutes, and then the treated material is rinsed with deionized water until it is neutral, and the neutral treated material is dried at 60°C to a moisture content of ≤5% to obtain relaxed viscose staple fibers.
[0012] Preferably, the relaxed viscose staple fiber is treated with a reinforcing treatment liquid, and the relaxed viscose staple fiber is immersed in the reinforcing treatment liquid at a bath ratio of 1:10 to 15, nitrogen is introduced into the reaction environment to exclude oxygen, and the reaction is carried out at a constant temperature oscillation of 60 to 80°C for 45 to 60 minutes, with an oscillation frequency of 100 to 200 times / minute, 0.1% hydroquinone is added to terminate the reaction, the reaction product is repeatedly washed with ethanol, and the reaction product is transferred to an ethanol solution containing 1% to 2% silane coupling agent. After soaking at room temperature for 10 minutes, the reaction product is rinsed with deionized water to obtain reinforced viscose staple fiber.
[0013] Preferably, the enhanced treatment liquid includes 5% to 10% by mass of a polyol compound, 5% to 15% by mass of a grafting monomer, 0.3% to 0.5% by mass of a cross-linking agent, 0.1% to 0.15% by mass of an initiator and deionized water. The corresponding mass fractions of the polyol compound, grafting monomer, cross-linking agent, initiator and deionized water are placed in a stirrer, the stirring speed is controlled to 200 to 500 r / min, and the stirring time is 30 to 60 minutes to obtain the enhanced treatment liquid.
[0014] Preferably, the polyol compound includes ethylene glycol and propylene glycol, the grafting monomer includes acrylic acid, glycidyl methacrylate and maleic anhydride, the crosslinking agent includes N,N'-methylenebisacrylamide and epichlorohydrin, and the initiator includes potassium persulfate and azobisisobutyronitrile.
[0015] Preferably, the reinforced viscose staple fibers are treated with nanocellulose, cellulose nanocrystals are dispersed in a polyethylene glycol solution with a mass fraction of 0.5% to 1%, and a nanocellulose suspension is formed after ultrasonic treatment for 20 minutes. The pH value of the nanocellulose suspension is adjusted to 6, and the reinforced viscose staple fibers are immersed in the nanocellulose suspension. After ultrasonic-assisted treatment for 20 minutes, the treated product is dried at 80°C to obtain reinforced viscose staple fibers.
[0016] Preferably, the reinforced viscose staple fiber is treated with acid solution, and the reinforced viscose staple fiber is immersed in a 0.5% citric acid solution at a bath ratio of 1:12, and treated at 30-40°C for 10 minutes. The treated product is rinsed with deionized water and then thermally cured at 120-150°C for 10-15 minutes to obtain high-strength viscose staple fiber.
[0017] Preferably, the high-strength viscose staple fibers are calendered using a hot roller calender with a working pressure of 5 to 10 MPa and a temperature of 80°C.
[0018] Compared with the prior art, the present invention has the following beneficial effects:
[0019] The present invention first uses alkali solution to pretreat viscose staple fibers, relaxes the amorphous regions of the viscose staple fibers to obtain relaxed viscose staple fibers, removes impurities on the surface of the viscose staple fibers, opens hydrogen bonds between cellulose molecular chains, and improves the permeability of subsequent reagents. Then, the relaxed viscose staple fibers are treated with a reinforcing treatment liquid to obtain reinforced viscose staple fibers. New functional groups are introduced on the surface of the viscose staple fibers by the reinforcing treatment liquid to improve the strength of the viscose staple fibers. Nanocellulose is then used to treat the reinforced viscose staple fibers to obtain reinforced viscose staple fibers, so that the nanocellulose and the viscose staple fibers are combined together to further supplement and enhance the strength of the viscose staple fibers. Finally, the reinforced viscose staple fibers are treated with an acid solution to solidify and stabilize the structure of the reinforced viscose staple fibers to obtain high-strength viscose staple fibers. Compared with the traditional viscose staple fiber reinforcement treatment method, the high-strength viscose staple fibers can significantly and effectively improve the strength and durability of the viscose staple fibers. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a flowchart of the steps of a chemical treatment method for improving the strength of viscose staple fibers disclosed in the present invention. DETAILED DESCRIPTION
[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0022] Example 1:
[0023] See also Figure 1 As shown, a chemical treatment method for improving the strength of viscose staple fibers comprises the following steps:
[0024] pretreating viscose staple fibers with alkali solution to obtain relaxed viscose staple fibers;
[0025] treating the relaxed viscose staple fibers with a reinforcement treatment liquid to obtain reinforced viscose staple fibers;
[0026] treating the reinforced viscose staple fibers with nanocellulose to obtain reinforced viscose staple fibers;
[0027] The reinforced viscose staple fibers are treated with an acid solution to obtain high-strength viscose staple fibers.
[0028] From the above, it can be seen that the viscose staple fibers are first pretreated with alkali solution to relax the amorphous regions of the viscose staple fibers to obtain relaxed viscose staple fibers, remove impurities on the surface of the viscose staple fibers, open the hydrogen bonds between the cellulose molecular chains, and improve the permeability of subsequent reagents. The relaxed viscose staple fibers are then treated with a reinforcing treatment liquid to obtain reinforced viscose staple fibers. New functional groups are introduced on the surface of the viscose staple fibers by the reinforcing treatment liquid to improve the strength of the viscose staple fibers. The reinforced viscose staple fibers are then treated with nanocellulose to obtain reinforced viscose staple fibers, so that the nanocellulose and the viscose staple fibers are combined together to further supplement and enhance the strength of the viscose staple fibers. Finally, the reinforced viscose staple fibers are treated with acid solution to solidify and stabilize the structure of the reinforced viscose staple fibers to obtain high-strength viscose staple fibers. Compared with the traditional viscose staple fiber reinforcement treatment method, it can significantly and effectively improve the strength and durability of the viscose staple fibers.
[0029] In the method of pre-treating the viscose staple fibers with alkali solution, the viscose staple fibers are immersed in a 3% to 5% sodium hydroxide solution with a bath ratio of 1:15, and treated at 60 to 80°C for 20 to 30 minutes. The treated material is then rinsed with deionized water until it is neutral, and the neutral treated material is dried at 60°C to a moisture content of ≤5% to obtain relaxed viscose staple fibers. The alkali solution can relax the amorphous region of the viscose staple fibers, remove impurities on the surface of the viscose staple fibers, and open the hydrogen bonds between the cellulose molecular chains, thereby improving the permeability of subsequent reagents. In some embodiments, the user can also perform an early oxidation treatment on the relaxed viscose staple fibers by immersing the relaxed viscose staple fibers in an acidic solution containing 0.5% to 1% ammonium persulfate and treating them at room temperature for 30 minutes to generate more hydroxyl or carboxyl active sites on the surface of the relaxed viscose staple fibers, thereby enhancing the activity of subsequent grafting reactions.
[0030] The relaxed viscose staple fibers are treated with a reinforcing treatment liquid, the relaxed viscose staple fibers are immersed in the reinforcing treatment liquid at a bath ratio of 1:10 to 15, nitrogen is introduced into the reaction environment to exclude oxygen, the reaction is carried out at a constant temperature oscillation of 60 to 80° C. for 45 to 60 minutes, the oscillation frequency is 100 to 200 times / minute, 0.1% hydroquinone is added to terminate the reaction, the reaction product is repeatedly washed with ethanol, and the reaction product is transferred to an ethanol solution containing 1% to 2% silane coupling agent. After soaking at room temperature for 10 minutes, the reaction product is rinsed with deionized water to obtain reinforced viscose staple fibers, and the strength of the viscose staple fibers is improved by introducing new functional groups on the surface of the relaxed viscose staple fibers.
[0031] The enhanced treatment liquid includes 5% to 10% by mass of a polyol compound, 5% to 15% by mass of a grafting monomer, 0.3% to 0.5% by mass of a cross-linking agent, 0.1% to 0.15% by mass of an initiator and deionized water. The corresponding mass fractions of the polyol compound, grafting monomer, cross-linking agent, initiator and deionized water are placed in a stirrer, the stirring speed is controlled at 200 to 500 r / min, and the stirring time is 30 to 60 minutes to obtain the enhanced treatment liquid.
[0032] The polyol compound includes ethylene glycol and propylene glycol. The polyol compound has multiple hydroxyl groups. These hydroxyl groups can interact with the hydroxyl groups on the surface of the viscose staple fiber to form hydrogen bonds. The interaction force between the molecular chains of the viscose staple fiber is enhanced by synthesizing hydrogen bonds, making the internal structure of the fiber more compact, thereby effectively improving the strength of the viscose staple fiber. In addition, the polyol compound can also improve the wettability of the enhanced treatment liquid, promote the treatment liquid to penetrate into the fiber more evenly, and ensure the consistency of the treatment effect; the grafting monomer includes acrylic acid, glycidyl methacrylate and maleic anhydride. The grafting monomer contains carboxyl Acid and epoxy groups can introduce new active functional groups on the surface of viscose staple fibers, and low molecular monomers can diffuse into the interior of the fibers to form a uniform grafting layer, thereby enhancing the mechanical strength of the fibers; the cross-linking agent includes N,N'-methylenebisacrylamide and epichlorohydrin, and the cross-linking agent connects the molecular chains of the viscose staple fibers through chemical reactions, thereby significantly improving the tensile strength and water resistance of the viscose staple fibers. At the same time, the cross-linking reaction can reduce the slippage of the cellulose molecular chains, thereby inhibiting the swelling and strength loss of the fibers in a wet state, thereby maintaining the strength of the viscose staple fibers. The initiator includes potassium persulfate and azobisisobutyronitrile.
[0033] The reinforced viscose staple fibers are treated with nanocellulose, cellulose nanocrystals are dispersed in a polyethylene glycol solution with a mass fraction of 0.5% to 1%, and a nanocellulose suspension is formed after ultrasonic treatment for 20 minutes. The pH value of the nanocellulose suspension is adjusted to 6, and the reinforced viscose staple fibers are immersed in the nanocellulose suspension. After ultrasonic-assisted treatment for 20 minutes, the treated product is dried at 80°C to obtain reinforced viscose staple fibers. The nanocellulose suspension can embed nanocrystals into the pores on the surface of the viscose staple fibers, thereby enhancing the interfacial bonding strength.
[0034] The reinforced viscose staple fibers are treated with acid solution, wherein the reinforced viscose staple fibers are immersed in a 0.5% citric acid solution at a bath ratio of 1:12, and treated at 30-40°C for 10 minutes. The treated product is rinsed with deionized water and then thermally cured at 120-150°C for 10-15 minutes to obtain high-strength viscose staple fibers.
[0035] Example 2:
[0036] Referring to Figure 1 As shown in the drawings, a chemical treatment method for improving the strength of viscose staple fiber, the steps include:
[0037] Pretreat the viscose staple fiber with alkali solution to obtain relaxed viscose staple fiber;
[0038] Treat the relaxed viscose staple fiber with a reinforcing treatment solution to obtain reinforced viscose staple fiber;
[0039] Treat the reinforced viscose staple fiber with nanocellulose to obtain reinforced viscose staple fiber;
[0040] Treat the reinforced viscose staple fiber with acid solution to obtain high-strength viscose staple fiber.
[0041] As can be seen from the above, first, the viscose staple fiber is pretreated with alkali solution, the amorphous region of the relaxed viscose staple fiber is obtained, the impurities on the surface of the viscose staple fiber are removed, the hydrogen bonds between the cellulose molecular chains are opened, and the permeability of the subsequent reagent is improved. Then, the relaxed viscose staple fiber is treated with a reinforcing treatment solution to obtain reinforced viscose staple fiber. New functional groups are introduced on the surface of the viscose staple fiber by the reinforcing treatment solution, thereby improving the strength of the viscose staple fiber. Then, the reinforced viscose staple fiber is treated with nanocellulose to obtain reinforced viscose staple fiber. The nanocellulose is combined with the viscose staple fiber, thereby further improving the strength of the viscose staple fiber. Finally, the reinforced viscose staple fiber is treated with acid solution to solidify and stabilize the structure of the reinforced viscose staple fiber, thereby obtaining high-strength viscose staple fiber. Compared with the traditional strengthening treatment method of viscose staple fiber, the strength and durability of the viscose staple fiber can be significantly and effectively improved.
[0042] In the pretreatment of the viscose staple fiber with alkali solution, the viscose staple fiber is immersed in a 4% sodium hydroxide solution, the bath ratio is 1:15, and after treatment at 70°C for 25 minutes, the treated product is washed with deionized water until it is neutral, and the neutral treated product is dried at 60°C until the moisture content is ≤5%, to obtain relaxed viscose staple fiber. The alkali solution can relax the amorphous region of the viscose staple fiber, remove the impurities on the surface of the viscose staple fiber, and open the hydrogen bonds between the cellulose molecular chains, thereby improving the permeability of the subsequent reagent. In some embodiments, the user can also perform an oxidation treatment on the relaxed viscose staple fiber by immersing the relaxed viscose staple fiber in an acidic solution containing 0.8% ammonium persulfate at room temperature for 30 minutes, to generate more hydroxyl or carboxyl active sites on the surface of the relaxed viscose staple fiber, thereby enhancing the activity of the subsequent grafting reaction.
[0043] The relaxed viscose staple fibers are treated with a reinforcing treatment liquid, and the relaxed viscose staple fibers are immersed in the reinforcing treatment liquid at a bath ratio of 1:12. Nitrogen is introduced into the reaction environment to remove oxygen. The reaction is carried out under constant temperature oscillation at 70°C for 50 minutes with an oscillation frequency of 150 times / minute. 0.1% hydroquinone is added to terminate the reaction. The reaction product is repeatedly washed with ethanol, and the reaction product is transferred to an ethanol solution containing 1% to 2% silane coupling agent. After soaking at room temperature for 10 minutes, the reaction product is rinsed with deionized water to obtain reinforced viscose staple fibers. By introducing new functional groups on the surface of the relaxed viscose staple fibers, the strength of the viscose staple fibers is improved.
[0044] The enhanced treatment liquid includes 7% by mass of a polyol compound, 10% by mass of a grafting monomer, 0.4% by mass of a cross-linking agent, 0.1% by mass of an initiator and deionized water. The corresponding mass fractions of the polyol compound, grafting monomer, cross-linking agent, initiator and deionized water are placed in a stirrer, the stirring speed is controlled at 400 r / min, and the stirring time is 45 minutes to obtain the enhanced treatment liquid.
[0045] The polyol compound includes ethylene glycol and propylene glycol. The polyol compound has multiple hydroxyl groups. These hydroxyl groups can interact with the hydroxyl groups on the surface of the viscose staple fiber to form hydrogen bonds. The interaction force between the molecular chains of the viscose staple fiber is enhanced by synthesizing hydrogen bonds, making the internal structure of the fiber more compact, thereby effectively improving the strength of the viscose staple fiber. In addition, the polyol compound can also improve the wettability of the enhanced treatment liquid, promote the treatment liquid to penetrate into the fiber more evenly, and ensure the consistency of the treatment effect; the grafting monomer includes acrylic acid, glycidyl methacrylate and maleic anhydride. The grafting monomer contains carboxyl Acid and epoxy groups can introduce new active functional groups on the surface of viscose staple fibers, and low molecular monomers can diffuse into the interior of the fibers to form a uniform grafting layer, thereby enhancing the mechanical strength of the fibers; the cross-linking agent includes N,N'-methylenebisacrylamide and epichlorohydrin, and the cross-linking agent connects the molecular chains of the viscose staple fibers through chemical reactions, thereby significantly improving the tensile strength and water resistance of the viscose staple fibers. At the same time, the cross-linking reaction can reduce the slippage of the cellulose molecular chains, thereby inhibiting the swelling and strength loss of the fibers in a wet state, thereby maintaining the strength of the viscose staple fibers. The initiator includes potassium persulfate and azobisisobutyronitrile.
[0046] The reinforced viscose staple fibers are treated with nanocellulose, cellulose nanocrystals are dispersed in a polyethylene glycol solution with a mass fraction of 0.75%, and a nanocellulose suspension is formed after ultrasonic treatment for 20 minutes. The pH value of the nanocellulose suspension is adjusted to 6, and the reinforced viscose staple fibers are immersed in the nanocellulose suspension. After ultrasonic-assisted treatment for 20 minutes, the treated product is dried at 80°C to obtain reinforced viscose staple fibers. The nanocellulose suspension can embed nanocrystals into the pores on the surface of the viscose staple fibers, thereby enhancing the interfacial bonding strength.
[0047] The reinforced viscose staple fibers are treated with acid solution, wherein the reinforced viscose staple fibers are immersed in a 0.5% citric acid solution at a bath ratio of 1:12, and treated at 35°C for 10 minutes. The treated product is rinsed with deionized water and then thermally cured at 130°C for 12 minutes to obtain high-strength viscose staple fibers.
[0048] The high-strength viscose staple fibers are calendered using a hot roller calendering machine with a working pressure of 8 MPa and a temperature of 80° C. The calendering treatment improves the surface density of the viscose staple fibers.
[0049] The breaking strength of the viscose staple fiber treated by this method is increased by 20% to 30% compared with that before treatment, greatly enhancing the durability and practicality of the fiber; the entire treatment process of this method has clear operation steps, the treatment conditions are easy to control, and no complex equipment is required, which effectively reduces the production difficulty and cost; the treatment liquid composition is environmentally friendly and no harmful pollutants are generated during the treatment process, which fully meets the requirements of green production; while improving the fiber strength, the fiber's hygroscopicity, dyeability, feel and other properties are basically unaffected, fully meeting the textile industry's diverse needs for fiber quality.
[0050] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.
[0051] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.
Claims
1. A chemical treatment method for improving the strength of viscose staple fibers, characterized in that the steps include: pretreating viscose staple fibers with alkali solution to obtain relaxed viscose staple fibers; treating the relaxed viscose staple fibers with a reinforcement treatment liquid to obtain reinforced viscose staple fibers; treating the reinforced viscose staple fibers with nanocellulose to obtain reinforced viscose staple fibers; The reinforced viscose staple fibers are treated with an acid solution to obtain high-strength viscose staple fibers.
2. The chemical treatment method for improving the strength of viscose staple fibers according to claim 1, characterized in that: In the method of pre-treating the viscose staple fibers with alkali solution, the viscose staple fibers are immersed in a 3% to 5% sodium hydroxide solution with a bath ratio of 1:15, and treated at 60 to 80° C. for 20 to 30 minutes. The treated fibers are then rinsed with deionized water until neutral, and the neutral treated fibers are dried at 60° C. until the moisture content is ≤5%, thereby obtaining relaxed viscose staple fibers.
3. The chemical treatment method for improving the strength of viscose staple fibers according to claim 1, characterized in that: The relaxed viscose staple fibers are treated with a reinforcing treatment liquid, the relaxed viscose staple fibers are immersed in the reinforcing treatment liquid at a bath ratio of 1:10 to 15, nitrogen is introduced into the reaction environment to remove oxygen, the reaction is carried out under constant temperature oscillation at 60 to 80° C. for 45 to 60 minutes, the oscillation frequency is 100 to 200 times per minute, 0.1% hydroquinone is added to terminate the reaction, the reaction product is repeatedly washed with ethanol, and the reaction product is transferred to an ethanol solution containing 1% to 2% silane coupling agent. After soaking at room temperature for 10 minutes, the reaction product is rinsed with deionized water to obtain the reinforced viscose staple fibers.
4. The chemical treatment method for improving the strength of viscose staple fibers according to claim 3, characterized in that: The enhanced treatment liquid includes 5% to 10% by mass of a polyol compound, 5% to 15% by mass of a grafting monomer, 0.3% to 0.5% by mass of a cross-linking agent, 0.1% to 0.15% by mass of an initiator and deionized water. The corresponding mass fractions of the polyol compound, grafting monomer, cross-linking agent, initiator and deionized water are placed in a stirrer, the stirring speed is controlled at 200 to 500 r / min, and the stirring time is 30 to 60 minutes to obtain the enhanced treatment liquid.
5. The chemical treatment method for improving the strength of viscose staple fibers according to claim 4, characterized in that: The polyol compound includes ethylene glycol and propylene glycol, the grafting monomer includes acrylic acid, glycidyl methacrylate and maleic anhydride, the crosslinking agent includes N,N'-methylenebisacrylamide and epichlorohydrin, and the initiator includes potassium persulfate and azobisisobutyronitrile.
6. The chemical treatment method for improving the strength of viscose staple fibers according to claim 1, characterized in that: The reinforced viscose staple fibers are treated with nanocellulose, cellulose nanocrystals are dispersed in a polyethylene glycol solution with a mass fraction of 0.5% to 1%, and a nanocellulose suspension is formed after ultrasonic treatment for 20 minutes. The pH value of the nanocellulose suspension is adjusted to 6, and the reinforced viscose staple fibers are immersed in the nanocellulose suspension. After ultrasonic-assisted treatment for 20 minutes, the treated product is dried at 80°C to obtain reinforced viscose staple fibers.
7. The chemical treatment method for improving the strength of viscose staple fibers according to claim 1, characterized in that: The reinforced viscose staple fibers are treated with acid solution, wherein the reinforced viscose staple fibers are immersed in a 0.5% citric acid solution at a bath ratio of 1:12, and treated at 30-40°C for 10 minutes. The treated product is rinsed with deionized water and then thermally cured at 120-150°C for 10-15 minutes to obtain high-strength viscose staple fibers.
8. The chemical treatment method for improving the strength of viscose staple fibers according to claim 1, characterized in that: The high-strength viscose staple fibers are calendered using a hot roller calender with a working pressure of 5 to 10 MPa and a temperature of 80°C.