A method for recycling cellulose-based waste textiles and using them to produce functional materials
By using a low-temperature alkaline solvent system to dissolve cellulose in combination with carbon black, and then combining wet spinning and casting molding, the degradation of non-cellulose components and high costs caused by high temperature and high alkali in the recycling and regeneration technology of cellulose-based waste textiles have been solved. This has enabled the preparation of low-cost and high-efficiency functional materials that are suitable for multiple application fields.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GANNAN NORMAL UNIV
- Filing Date
- 2026-04-20
- Publication Date
- 2026-06-30
AI Technical Summary
In existing technologies, the recycling and regeneration of cellulose-based waste textiles suffers from problems such as degradation of non-cellulose components under high temperature and high alkali conditions, long process flow, high equipment requirements, high processing costs, and limited molding methods, making it difficult to achieve integrated recycling and functional preparation with low cost, zero pollution, and high recovery rate.
A low-temperature alkaline solvent system (0℃ to -20℃) is used to combine carbon black with cellulose. Cellulose is dissolved by mechanical stirring, while non-cellulose components are retained as solids. Functional materials are then prepared by wet spinning, wet film formation, and casting. The alkali concentration is controlled at 4~10%, and the carbon content is 0.15%~1%.
This technology enables efficient dissolution and regeneration of cellulose solutions, producing biodegradable and functional green materials. It simplifies the process, reduces costs, and improves material utilization, making it suitable for applications in textiles and apparel, green packaging, automotive interiors, and biomedical materials.
Smart Images
Figure CN122302334A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of resource recycling of waste textiles and preparation of functional biomass materials, specifically a method for recycling cellulose-based waste textiles and using them to prepare functional materials. Background Technology
[0002] With the continuous development of the global textile industry and the upgrading of consumption, the production and consumption of textiles have been rising steadily. Cellulose-containing waste textiles (such as cotton, viscose, lyocell, and cellulose-based blended fabrics) have become a massive amount of industrial and domestic solid waste. Large quantities of waste clothing, home textiles, and textile scraps are not effectively recycled and are mostly disposed of through landfill and incineration. This not only causes a serious waste of natural cellulose resources but also leads to environmental problems such as soil pollution and increased carbon emissions, which is inconsistent with the requirements of green, low-carbon, and circular economic development.
[0003] Currently, recycling technologies for waste cellulose textiles still have significant limitations. Traditional recycling processes often employ high-temperature, high-alkali, or strong oxidizing conditions, which, while capable of dissolving cellulose, easily lead to the degradation, embrittlement, and structural damage of non-cellulose components in the fabric. This makes it difficult to achieve simultaneous recovery of multiple components, resulting in low material utilization. Furthermore, existing recycling methods generally suffer from long process flows, demanding equipment requirements, high processing costs, and limited molding methods, making it difficult to meet the demands for low-cost, large-scale remanufacturing.
[0004] Currently, the market demand for biodegradable and functional green materials continues to grow, but there are still significant shortcomings in the resource recovery and functionalization technology of cellulose-based waste textiles. Low-cost, zero-pollution, and high-recyclability integrated recycling and functionalization technology has become an urgent need in the industry, and has important research value and broad application prospects. Summary of the Invention
[0005] The purpose of this invention is to provide a method for recycling cellulose-based waste textiles and using them to prepare functional materials, in order to address the problem mentioned in the background art: the market demand for biodegradable and functional green materials continues to grow, while the technology for resource recovery and functionalization of cellulose-based waste textiles still has significant shortcomings. Low-cost, zero-pollution, and high-recovery-rate integrated recycling and functionalization technology has become an urgent need in the industry and has important research value and broad application prospects.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for recycling cellulose-based waste textiles and using them to prepare functional materials, the preparation method comprising the following steps: S1. First, the waste textile containing cellulose is loosened and mixed with cellulose solvent and carbon black to obtain a cellulose solution. The flocculent raw material is then mixed with a pre-cooled low-temperature solvent system and a functional filler. The low-temperature solvent system contains alkali, urea, and water, and the functional filler is carbon black. Under low-temperature conditions of 0°C to -20°C, the mixture is mechanically stirred and dissolved to dissolve the cellulose and uniformly compound it with the carbon black, resulting in a carbon black cellulose composite solution. At the same time, the non-cellulose components in the waste textile are retained in solid form. The carbon black cellulose composite solution is then subjected to solid-liquid separation to remove the undissolved non-cellulose solid components, resulting in a clear carbon black cellulose composite solution.
[0007] S2. The recycling and reuse methods include wet spinning, wet film formation, and casting. The cellulose solution is reused to obtain regenerated cellulose filaments, cellulose films, and cellulose plastic products. The cellulose solution is pretreated, including refiltration and degassing. The pretreated cellulose solution is extruded through a wet spinning machine in a coagulation bath to regenerate filaments. The initial filaments are drawn by drawing rollers, washed with water to remove sodium hydroxide and coagulation bath components, oiled, and dried to obtain cellulose fibers. The regenerated cellulose film preparation method, the continuous wet film formation preferably includes: extruding the cellulose solution through a slot extrusion device and continuously wet forming a film in a coagulation bath.
[0008] S3. Finally, through traction and stretching, and by washing with water to remove sodium hydroxide and coagulation bath components, a cellulose film is obtained by drying. The cellulose solution is then subjected to pre-crosslinking, casting, molding, washing with water, hydrophobic treatment, and drying to form a final product.
[0009] Preferably, the cellulose-containing waste textiles include viscose fiber, viscose fiber / polyester, and cotton / polyester, and the cellulose solvent includes the following raw materials in parts by weight: 4-10 parts alkali, 0-8 parts urea, and 82-96 parts water, and 16-40 parts carbon black; preferably, 6-10 parts alkali, 2-5 parts urea, and 85-92 parts water, and 20-48 parts carbon black.
[0010] Preferably, the temperature at which the cellulose solution is obtained is 0 to -20°C, the mass concentration of the cellulose solution is 1 to 10%, and the carbon mass concentration of the cellulose solution is 0.15 to 1%.
[0011] Preferably, the filtration is continuous filtration; the pore size of the filter element is preferably 1~20μm; the degassing is preferably vacuum degassing or static degassing; the vacuum degassing time is preferably 3~6h, and the static degassing time is preferably 8~16h.
[0012] Preferably, the coagulation bath is an organic solvent, an acid, or a salt; the organic solvent is preferably an aqueous solution of ethanol with a volume concentration of 60%; the acid is preferably sodium bicarbonate with a mass concentration of 10%; and the salt is preferably sodium citrate with a mass concentration of 10%.
[0013] Preferably, the cellulose solution pre-crosslinking is preferably epichlorohydrin crosslinking, the hydrophobic treatment is preferably hexadecyltrimethoxysilane hydrophobic agent, and the cleaning reagent is preferably water. There are no specific limitations on the amount of cleaning reagent or the number of cleaning cycles, as long as the alkali and salt can be cleaned off.
[0014] Preferably, the mechanical stirring dissolution time is 10 minutes to 2 hours, the stirring speed is 200 to 1500 rpm, and the total mass concentration of the carbon black cellulose composite solution is 1% to 10%, wherein the mass concentration of cellulose is 1% to 6%.
[0015] Preferably, when casting is used, a crosslinking agent and / or a hydrophobic modifier are added to the carbon black cellulose composite solution before molding; the crosslinking agent is epichlorohydrin, and the amount added is 1% to 10% of the cellulose mass; the hydrophobic modifier is hexadecyltrimethoxysilane, and the amount added is 0.5% to 5% of the cellulose mass; the post-treatment includes: washing in warm water at 30 to 60°C for 10 to 30 minutes to remove residual alkali and coagulation bath components, and then drying in a forced-air or vacuum at 60 to 100°C until constant weight.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In the method of recycling cellulose-based waste textiles and using them to prepare functional materials, the alkali concentration is controlled at 4~10% and the temperature at 0~-20℃, and the carbon content is 0.15%~1%, which can maximize the dissolution of cellulose solution and maximize the dissolution of carbon in cellulose. The cellulose solution obtained by this method can be reused and remanufactured in a simple and low-cost manner, including obtaining regenerated cellulose fibers, cellulose films and cellulose plastics by wet spinning, wet film forming and casting. The preparation method provided by the present invention is simple to operate and easy to industrialize.
[0017] The technology of this invention combines environmental friendliness, low cost, and high added value, and can be widely applied in fields such as textiles and apparel, green packaging, automotive interiors, electronic shielding, and biomedical materials. It aligns with the development direction of circular economy, low-carbon environmental protection, and green transformation of the textile industry, and has significant environmental and economic benefits. Attached Figure Description
[0018] Figure 1 A schematic diagram of the technology for preparing functional materials from cellulose-containing waste textiles; Figure 2This is a microscope image of the waste textile fabric from Example 1 after it has been dissolved in a low-temperature alkaline solution. Figure 3 This is a microscope image of the waste textiles from Example 2 after they were dissolved in a low-temperature alkaline solution. Figure 4 The tensile mechanical properties of the regenerated cellulose fibers and film obtained in step (5) of Example 1 are shown in the diagram. Figure 5 The tensile mechanical properties of the regenerated cellulose fibers and films obtained in step (5) of Example 2 are shown in the diagram. Figure 6 The tensile mechanical properties of the regenerated cellulose fibers and film obtained in step (5) of Example 3 are shown in the diagram. Figure 7 The diagram shows the tensile mechanical properties of the regenerated cellulose fibers and films obtained in step (5) of Example 4. Detailed Implementation
[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] Please see Figure 1-7 A method for recycling cellulose-based waste textiles and using them to prepare functional materials, the preparation method comprising the following steps: S1. First, after loosening the waste textile containing cellulose, the preparation method mixes it with cellulose solvent and carbon black to obtain a cellulose solution. The flocculent raw material of the preparation method is then mixed with a pre-cooled low-temperature solvent system and functional filler. The low-temperature solvent system of the preparation method contains alkali, urea and water, and the functional filler is carbon black. Under low-temperature conditions of 0℃ to -20℃, the mixture is mechanically stirred and dissolved to dissolve the cellulose and uniformly compound it with the carbon black, resulting in a carbon black cellulose composite solution. At the same time, the non-cellulose components in the waste textile are retained in solid form. The carbon black cellulose composite solution of the preparation method is then subjected to solid-liquid separation to remove the undissolved non-cellulose solid components, resulting in a clear carbon black cellulose composite solution.
[0021] S2. The recycling and reuse methods include wet spinning, wet film formation, and casting. Cellulose solutions are reused to obtain regenerated cellulose filaments, cellulose films, and cellulose plastic products. The cellulose solution undergoes pretreatment, including refiltration and degassing. The pretreated cellulose solution is extruded through a wet spinning machine in a coagulation bath to regenerate filaments. The initial filaments are drawn by drawing rollers, washed with water to remove sodium hydroxide and coagulation bath components, oiled, and dried to obtain cellulose fibers. The regenerated cellulose film preparation method, preferably using continuous wet film formation, includes: extruding the cellulose solution through a slot extruder and continuously wet forming the film in a coagulation bath. In the method of recycling cellulose-based waste textiles and using them to prepare functional materials, controlling the alkali concentration to 4-10%, the temperature to 0--20℃, and the carbon content to 0.15%-1% maximizes the dissolution of the cellulose solution and the maximum carbon dissolution in the cellulose. The cellulose solution obtained by this method can achieve simple and low-cost reuse and product remanufacturing.
[0022] S3. Finally, through traction and stretching, and by washing to remove sodium hydroxide and coagulation bath components, a cellulose film is obtained by drying. The cellulose solution is then subjected to pre-crosslinking, casting, molding, washing, hydrophobic treatment, and drying. This technology is applicable to the recycling and treatment of waste textiles such as cotton, viscose, and linen, as well as polyester / cotton blended textiles. It covers the entire process of waste textile pretreatment, green dissolution, component separation, regeneration molding, and functional modification.
[0023] Example 1: S1. Sodium hydroxide and water are mixed in a mass ratio of 14:86 and pre-cooled at -16°C to obtain cellulose solvent.
[0024] S2. Loosen the waste viscose / cotton in a pulverizer to obtain flocculent raw material. Mix the flocculent viscose / cotton with urea at a mass ratio of 16:84 and pre-cool at 0℃.
[0025] S3. Mix the solutions and mechanically stir at -10°C to obtain a cellulose solution. In this invention, the dissolution process is carried out under stirring conditions. This invention does not specifically limit the stirring speed, as long as the cellulose can be fully dissolved.
[0026] S4. The cellulose solution is further filtered through a series of 20 μm-5 μm-1 μm filter cartridges, and the filtrate is allowed to stand for 3 hours to remove bubbles.
[0027] S5. The degassed solution is extruded through a wet spinning machine into a 10 wt% sodium bicarbonate coagulation bath to regenerate a film. Finally, the film is washed with water, oiled, and dried to obtain a regenerated cellulose film.
[0028] The cellulose mixture and the separated cellulose solution obtained in step (5) were observed using an optical microscope, and the results are as follows: Figure 2 Polyester fibers maintain their good fiber morphology in low-temperature alkaline solutions without significant damage, and a clear and transparent cellulose solution can be obtained after filtration.
[0029] The tensile mechanical properties of the regenerated cellulose fiber obtained in step (5) were tested using the tensile property test method. The result was that the tensile strength of the regenerated cellulose fiber was 159 MPa.
[0030] Example 2: S1. Sodium hydroxide, water and carbon black are mixed in a mass ratio of 14:85.7:0.3 and pre-cooled at -16℃ to obtain carbon black cellulose solvent.
[0031] S2. Loosen the waste viscose / cotton in a pulverizer to obtain flocculent raw material. Mix the flocculent viscose / cotton with urea at a mass ratio of 16:84 and pre-cool at 0℃.
[0032] S3. Mix the solutions and mechanically stir at -10°C to obtain a carbon black cellulose solution. In this invention, the dissolution process is carried out under stirring conditions. This invention does not specifically limit the stirring speed, as long as the cellulose can be fully dissolved.
[0033] S4. The cellulose solution is further filtered through a series of 20 μm-5 μm-1 μm filter cartridges, and the filtrate is allowed to stand for 3 hours to remove bubbles.
[0034] S5. The degassed solution is extruded through a wet spinning machine into a 10 wt% sodium bicarbonate coagulation bath to regenerate a film. Finally, the film is washed with water, oiled, and dried to obtain a regenerated cellulose film.
[0035] The cellulose mixture and the separated cellulose solution obtained in step (5) were observed using an optical microscope, and the results are as follows: Figure 2 Polyester fibers maintain their good fiber morphology in low-temperature alkaline solutions without significant damage, and a clear and transparent cellulose solution can be obtained after filtration.
[0036] The tensile mechanical properties of the regenerated cellulose fiber obtained in step (5) were tested using the tensile property test method. The results showed that the tensile strength of the regenerated cellulose fiber was 162.5 MPa.
[0037] Example 3: S1. Sodium hydroxide, water and carbon black are mixed in a mass ratio of 14:85:1 and pre-cooled at -16℃ to obtain carbon black cellulose solvent.
[0038] S2. Loosen the waste viscose / cotton in a pulverizer to obtain flocculent raw material. Mix the flocculent viscose / cotton with urea at a mass ratio of 16:84 and pre-cool at 0℃.
[0039] S3. Mix the solutions and mechanically stir at -10℃ to obtain a carbon black cellulose solution.
[0040] S4. The cellulose solution is further filtered through a series of 20 μm-5 μm-1 μm filter cartridges, and the filtrate is allowed to stand for 3 hours to remove bubbles.
[0041] S5. The degassed solution is extruded through a wet spinning machine into a 10 wt% sodium bicarbonate coagulation bath to regenerate a film. Finally, the film is washed with water, oiled, and dried to obtain a regenerated cellulose film.
[0042] The tensile mechanical properties of the regenerated cellulose fiber obtained in step (5) were tested using the tensile property test method. The result was that the tensile strength of the regenerated cellulose fiber was 162 MPa.
[0043] Example 4: S1. Sodium hydroxide, water and carbon black are mixed in a mass ratio of 14:84:2 and pre-cooled at -16℃ to obtain carbon black cellulose solvent.
[0044] S2. Loosen the waste viscose / cotton in a pulverizer to obtain flocculent raw material. Mix the flocculent viscose / cotton with urea at a mass ratio of 16:84 and pre-cool at 0℃.
[0045] S3. Mix the solutions and mechanically stir at -10℃ to obtain a carbon black cellulose solution.
[0046] S4. The cellulose solution is further filtered through a series of 20 μm-5 μm-1 μm filter cartridges, and the filtrate is allowed to stand for 3 hours to remove bubbles.
[0047] S5. The degassed solution is extruded through a wet spinning machine into a 10 wt% sodium bicarbonate coagulation bath to regenerate a film. Finally, the film is washed with water, oiled, and dried to obtain a regenerated cellulose film.
[0048] The tensile mechanical properties of the regenerated cellulose fiber obtained in step (5) were tested using the tensile property test method. The results showed that the tensile strength of the regenerated cellulose fiber was 167.5 MPa.
[0049] Example 5: S1. Sodium hydroxide, water and carbon black are mixed in a mass ratio of 14:84.5:1.5 and pre-cooled at -16℃ to obtain carbon black cellulose solvent.
[0050] S2. Loosen the waste polyester cotton in a pulverizer to obtain flocculent raw material. Mix the flocculent polyester cotton with urea at a mass ratio of 4:96 and pre-cool at 0℃.
[0051] S3. Mix the solutions and mechanically stir at -10℃ to obtain a carbon black cellulose solution.
[0052] S4. The cellulose solution is further filtered through a series of 20 μm-5 μm-1 μm filter cartridges, and the filtrate is allowed to stand for 3 hours to remove bubbles.
[0053] S5. The degassed solution is extruded through a wet spinning machine into a 10 wt% sodium bicarbonate coagulation bath to regenerate a film. Finally, the film is washed with water, oiled, and dried to obtain a regenerated cellulose film.
[0054] Example 6: S1. Sodium hydroxide, water and carbon black are mixed in a mass ratio of 14:85:3 and pre-cooled at -16℃ to obtain carbon black cellulose solvent.
[0055] S2. Loosen the waste polyester cotton in a pulverizer to obtain flocculent raw material. Mix the flocculent polyester cotton with urea at a mass ratio of 4:96 and pre-cool at 0℃.
[0056] S3. Mix the solutions and mechanically stir at -10℃ to obtain a carbon black cellulose solution.
[0057] S4. The cellulose solution is further filtered through a series of 20 μm-5 μm-1 μm filter cartridges, and the filtrate is allowed to stand for 3 hours to remove bubbles.
[0058] S5. The degassed solution is extruded through a wet spinning machine into a 10 wt% sodium bicarbonate coagulation bath to regenerate a film. Finally, the film is washed with water, oiled, and dried to obtain a regenerated cellulose film.
[0059] Comparative example: S1. Sodium hydroxide, urea, water and carbon black are mixed in a mass ratio of 7:8:76..7:0.3 and pre-cooled at -12℃ to obtain cellulose solvent.
[0060] S2. Loosen the waste cotton / viscose in a pulverizer to obtain flocculent raw material. Take 8g of flocculent cotton / polyester and add it to 92g of cellulose solvent. Stir mechanically at -10℃ to obtain cellulose solution.
[0061] S3. The cellulose solution is further filtered through a series of 20 μm-5 μm-1 μm filter cartridges, and the filtrate is allowed to stand for 3 hours to remove bubbles.
[0062] S4. After the degassing solution is cast into a film by casting, it is then regenerated in a 10 wt% sodium bicarbonate coagulation bath. Finally, the film is washed with water, oiled, and dried to obtain a regenerated cellulose film.
[0063] Through comparative tests, it was found that (2) had low solubility of cellulose and carbon in the solution, and (4) had poor formability, indicating that the cellulose concentration was low. In comparison with Examples 3 and 4, this method was relatively less effective in dissolving the adhesive and carbon, and (4) also had poorer tensile properties.
[0064] In summary, this invention discloses a method for recycling cellulose-based waste textiles and using them to prepare functional materials and for resource-based recycling and reuse. It employs a mild dissolution system with a low temperature of 0-20°C and an alkali concentration of 4-10%, combined with carbon black composite modification, which can efficiently dissolve cellulose. The resulting cellulose solution can be used to prepare regenerated cellulose fibers, films, and plastics at low cost through wet spinning, wet film formation, and casting. The process is simple and easily industrialized. The introduction of carbon black imparts functional properties and mechanical strengthening effects to the materials, significantly increasing the added value of recycled products. This method effectively solves the problems of harsh conditions in traditional recycling processes, limited functionality of recycled materials, and low resource utilization rates, providing a feasible technical route for the low-carbon recycling of textile solid waste.
[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A method for recycling cellulose-based waste textiles and using them to prepare functional materials, characterized in that: Its preparation method includes the following steps: S1. First, the waste textile containing cellulose is loosened and mixed with cellulose solvent and carbon black to obtain a cellulose solution. The flocculent raw material is then mixed with a pre-cooled low-temperature solvent system and a functional filler. The low-temperature solvent system contains alkali, urea and water, and the functional filler is carbon black. Under low-temperature conditions of 0°C to -20°C, the mixture is mechanically stirred and dissolved to dissolve the cellulose and uniformly compound it with the carbon black to obtain a carbon black cellulose composite solution. At the same time, the non-cellulose components in the waste textile are retained in solid form. The carbon black cellulose composite solution is then subjected to solid-liquid separation to remove the undissolved non-cellulose solid components, resulting in a clear carbon black cellulose composite solution. S2. The recycling and reuse methods include wet spinning, wet film formation, and casting. The cellulose solution is reused to obtain regenerated cellulose filaments, cellulose films, and cellulose plastic products. The cellulose solution is pretreated, including refiltration and degassing. The pretreated cellulose solution is extruded through a wet spinning machine in a coagulation bath to regenerate filaments. The initial filaments are drawn by drawing rollers, washed with water to remove sodium hydroxide and coagulation bath components, oiled, and dried to obtain cellulose fibers. The regenerated cellulose film preparation method, the continuous wet film formation preferably includes: extruding the cellulose solution through a slot extrusion device and continuously wet forming a film in a coagulation bath. S3. Finally, through traction and stretching, and by washing with water to remove sodium hydroxide and coagulation bath components, a cellulose film is obtained by drying. The cellulose solution is then subjected to pre-crosslinking, casting, molding, washing with water, hydrophobic treatment, and drying to form a final product.
2. The method for recycling cellulose-based waste textiles and using them to prepare functional materials according to claim 1, characterized in that: The cellulose-containing waste textiles include viscose fiber, viscose fiber / polyester and cotton / polyester, and the cellulose solvent includes the following raw materials in parts by weight: 4-10 parts alkali, 0-8 parts urea and 82-96 parts water, and 16-40 parts carbon black; preferably 6-10 parts alkali, 2-5 parts urea and 85-92 parts water, and 20-48 parts carbon black.
3. The method for recycling cellulose-based waste textiles and using them to prepare functional materials according to claim 1, characterized in that: The temperature at which the cellulose solution is obtained is 0 to -20°C, the mass concentration of the cellulose solution is 1 to 10%, and the carbon mass concentration of the cellulose solution is 0.15 to 1%.
4. The method for recycling cellulose-based waste textiles and using them to prepare functional materials according to claim 1, characterized in that: The filtration is preferably continuous filtration; the pore size of the filter element is preferably 1~20μm; the degassing is preferably vacuum degassing or static degassing; the vacuum degassing time is preferably 3~6h, and the static degassing time is preferably 8~16h.
5. The method for recycling cellulose-based waste textiles and using them to prepare functional materials according to claim 1, characterized in that: The coagulation bath is preferably an organic solvent, an acid, or a salt; the organic solvent is preferably an aqueous solution of ethanol with a volume concentration of 60%; the acid is preferably sodium bicarbonate with a mass concentration of 10%; and the salt is preferably sodium citrate with a mass concentration of 10%.
6. The method for recycling cellulose-based waste textiles and using them to prepare functional materials according to claim 1, characterized in that: The cellulose solution pre-crosslinking is preferably epichlorohydrin crosslinking, the hydrophobic treatment is preferably hexadecyltrimethoxysilane hydrophobic agent, and the cleaning reagent is preferably water. There are no specific limitations on the amount of cleaning reagent or the number of cleaning cycles, as long as the alkali and salt can be cleaned off.
7. The method for recycling cellulose-based waste textiles and using them to prepare functional materials according to claim 1, characterized in that: The mechanical stirring dissolution time is 10 minutes to 2 hours, the stirring speed is 200 to 1500 rpm, and the total mass concentration of the carbon black cellulose composite solution is 1% to 10%, of which the mass concentration of cellulose is 1% to 6%.
8. The method for recycling cellulose-based waste textiles and using them to prepare functional materials according to claim 1, characterized in that: When casting is used, a crosslinking agent and / or a hydrophobic modifier are added to the carbon black cellulose composite solution before molding; the crosslinking agent is epichlorohydrin, and the amount added is 1% to 10% of the cellulose mass; the hydrophobic modifier is hexadecyltrimethoxysilane, and the amount added is 0.5% to 5% of the cellulose mass. The post-treatment includes: washing in warm water at 30 to 60°C for 10 to 30 minutes to remove residual alkali and coagulation bath components, and then drying in a forced-air or vacuum at 60 to 100°C until constant weight.