Method for producing recycled environmentally friendly composite yarn and recycled environmentally friendly yarn

Abstract

The present application relates to the field of textiles, and specifically discloses a method for producing regenerated environmentally friendly composite yarn and a method for producing regenerated environmentally friendly yarn. The method for producing regenerated environmentally friendly composite yarn includes the following steps: S1. Raw material preparation: collecting and sorting waste polyester cellulose materials to remove impurities and pollutants therein; S2. Celluloseization: processing the waste polyester cellulose materials to produce cellulose raw materials; S3. Regeneration: extracting the cellulose raw materials to produce polyester fiber raw materials; S4. Polymerization: mixing the polyester fiber raw materials produced in S3 with other raw materials for polymerization reaction to generate regenerated polyester polymers; S5. Drawing: subjecting the regenerated polyester polymers to a process of melting and extrusion to form fibrous regenerated polyester filaments; S6. Spinning: subjecting the regenerated polyester filaments to a spinning process, and forming yarns by stretching and twisting. The regenerated environmentally friendly composite yarn of the present application has the advantages of improving material utilization and being more environmentally friendly.

Description

Technical Field

[0001] The present application relates to the field of textiles, and more specifically, to a method for producing a regenerated environmentally friendly composite yarn and the regenerated environmentally friendly yarn. Background Art

[0002] Ring spinning involves drawing sliver or roving fibers through a rotating ring traveler. The bobbin winds faster than the traveler, twisting the yarn into fine yarn. This method is widely used in various short-staple spinning processes, such as carded, combed, and blended yarns. The traveler, driven by the bobbin through the yarn, rotates around a steel collar, adding twist. Friction from the collar causes the yarn to rotate slightly slower than the bobbin, resulting in a continuous loop. Spinning speeds are high, and ring yarn forms a conical helix with fibers primarily shifting inward and outward. This creates a dense, interconnected yarn structure, resulting in high strength and suitability for thread production, as well as for weaving and knitting.

[0003] The yarn waste produced during the spinning process, the scraps produced during the garment-making process, and the clothes discarded by consumers are often treated as waste. This treatment method wastes materials and is not environmentally friendly. Summary of the Invention

[0004] In order to improve the utilization rate of materials, the present application provides a method for producing a regenerated environmentally friendly composite yarn and a regenerated environmentally friendly yarn.

[0005] In a first aspect, the present application provides a method for producing a regenerated environmentally friendly composite yarn, which adopts the following technical solution: A method for producing a regenerated environmentally friendly composite yarn comprises the following steps:

[0006] S1. Raw material preparation: Collect and sort waste polyester cellulose materials to remove impurities and pollutants;

[0007] S2, cellulose: processing the waste polyester cellulose material to produce cellulose raw materials;

[0008] S3, regeneration: extracting the cellulose raw material to obtain polyester fiber raw material;

[0009] S4, polymerization: mixing the polyester fiber raw material prepared in S3 with other raw materials to carry out polymerization reaction to generate regenerated polyester polymer;

[0010] S5, drawing: the recycled polyester polymer is melted and extruded to form fibrous recycled polyester yarn;

[0011] S6. Spinning: The regenerated polyester yarn is spun and formed into yarn through stretching and twisting.

[0012] By adopting the above technical solution, since waste polyester cellulose materials are recycled and processed, the waste yarns generated in the spinning process, the scraps generated in the clothing making process or the clothes discarded by consumers can be recycled and reused, thereby improving the material utilization rate and being more environmentally friendly. At the same time, because other raw materials are added to polymerize with the polyester fiber raw materials during the repolymerization process, the regenerated yarn maintains excellent anti-breakage and anti-pilling properties.

[0013] Preferably, the processing method in the S2 celluloseization includes mechanical crushing.

[0014] By adopting the above technical solution, the size of the cellulose raw material after mechanical crushing is reduced, thereby obtaining a cellulose raw material to be processed with uniform size. At this time, the cellulose raw material contains not only polyester fiber raw material, but also other fiber raw materials or other substances, so that the cellulose raw material at this time is a mixture of multiple substances. Therefore, the cellulose raw material is crushed in this step, which is more convenient for subsequent regeneration processing, thereby reducing the difficulty of subsequent regeneration processing.

[0015] Preferably, the extraction method in the S3 regeneration includes dissolution and recovery.

[0016] By adopting the above technical solution, the polyester fibers in the waste material are first dissolved, the insoluble matter is filtered out, and then the dissolved polyester fibers are recovered, thereby effectively reducing impurities in the polyester fibers and improving the purity of the polyester fibers. The improvement of the purity of the polyester fibers is conducive to maintaining excellent performance of the finally formed polyester yarn.

[0017] Preferably, the polymerization reaction mode in the S4 polymerization is melt polymerization.

[0018] By adopting the above technical solution, the regenerated polyester fiber raw materials and other raw materials are melt-polymerized to enhance the regenerated polyester fiber, compensate for the decline in polyester fiber performance caused by polyester fiber regeneration, and ensure that the final polyester yarn maintains excellent performance.

[0019] In a second aspect, the present application provides a regenerated environmentally friendly composite yarn, which adopts the following technical solution:

[0020] A regenerated environmentally friendly composite yarn is produced by a spinning process of regenerated polyester filaments, wherein the regenerated polyester filaments are produced by melt extrusion of the following raw materials in parts by weight: 60 to 80 parts of cellulose raw material, 5 to 15 parts of fiber reinforcement, 4 to 6 parts of crystallization accelerator, and 5 to 7 parts of auxiliary fiber.

[0021] By adopting the above technical solution, during the melt extrusion process, the fiber reinforcement and auxiliary fibers first reinforce the cellulose raw material, so that the performance of the formed polyester fiber is enhanced. At the same time, the addition of the crystallization promoter increases the crystallinity of the regenerated polyester fiber, thereby further improving the performance of the regenerated polyester fiber.

[0022] Preferably, the cellulose raw material is subjected to surface etching modification treatment.

[0023] By adopting the above technical solution, the surface roughness of the cellulose raw material that has been subjected to surface etching modification is improved, which is more conducive to the combination of fiber reinforcement and auxiliary fibers with it. During the melting process, since the fiber reinforcement and auxiliary fibers are both combined with the cellulose raw material that has been subjected to surface etching modification, the melt bonding degree is better, so that the performance of the finally formed polyester fiber is better.

[0024] Preferably, the surface modification treatment step is: adding sodium hydroxide to an ethylene glycol aqueous solution, then adding a cellulose raw material, stirring and heating, then washing with deionized water for multiple times and freeze-drying to obtain a surface-modified cellulose raw material.

[0025] By adopting the above technical solution, the cellulose raw material is surface treated with an etching solution. The surface roughness of the cellulose raw material after surface treatment is improved, which is more conducive to the combination of the cellulose raw material with other raw materials. It is also more conducive to the mixing of the raw materials during the melting process, improves the dispersion uniformity, and thus improves the performance of the final polyester fiber.

[0026] Preferably, the fiber reinforcement comprises pentaerythritol stearate.

[0027] By adopting the above technical solution, the molecular structure of polyester fiber is enhanced by the multi-branched chain of pentaerythritol stearate itself, thereby improving the performance of polyester fiber. In addition, during the melting process, pentaerythritol stearate can replace the decomposition of polyester fiber, thereby reducing polyester fiber loss and improving the recycling rate of polyester fiber.

[0028] Preferably, the crystallization promoter comprises polyethylene glycol.

[0029] By adopting the above technical solution, polyethylene glycol is added to the regenerated polyester fiber production process during the melting process. Polyethylene glycol promotes the crystallization of the polyester fiber, thereby improving the crystallization speed and crystallinity of the polyester fiber, which is beneficial to improving the performance of the regenerated polyester fiber.

[0030] In summary, this application has the following beneficial effects:

[0031] 1. Since waste polyester cellulose materials are recycled and processed, the waste yarns produced in the spinning process, the scraps produced in the garment making process or the clothes discarded by consumers can be recycled and reused, thereby improving the material utilization rate and being more environmentally friendly. At the same time, because other raw materials are added to the polyester fiber raw materials during the repolymerization process, the regenerated yarn maintains excellent anti-breakage and anti-pilling properties.

[0032] 2. In the present application, during the melt extrusion process, the fiber reinforcement and auxiliary fibers first reinforce the cellulose raw material, so that the performance of the formed polyester fiber is enhanced. At the same time, the addition of the crystallization promoter increases the crystallinity of the regenerated polyester fiber, thereby further improving the performance of the regenerated polyester fiber.

[0033] 3. In this application, an etching solution is used to surface treat the cellulose raw material. The surface roughness of the cellulose raw material after surface treatment is improved, which is more conducive to the combination of the cellulose raw material with other raw materials. It is also more conducive to the mixing of various raw materials during the melting process, improving the dispersion uniformity, and thus improving the performance of the final polyester fiber. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to the embodiments.

[0035] Example

[0036] Example 1

[0037] This embodiment discloses a method for producing a regenerated environmentally friendly composite yarn, comprising the following steps:

[0038] S1. Raw material preparation: collecting and sorting waste polyester cellulose materials. In this embodiment, waste polyester yarn is used to remove impurities and pollutants.

[0039] S2, cellulose: the waste polyester cellulose material is mechanically crushed and processed to produce cellulose raw materials with a length of 10 mm;

[0040] S3, regeneration: extracting the cellulose raw material to obtain a polyester fiber raw material, specifically, the extraction operation is as follows: dissolving potassium hydroxide in an ethanol solution to obtain a 10% potassium hydroxide ethanol solution, then adding dioxane by weight of the potassium hydroxide and mixing evenly, then adding the cellulose raw material obtained in S2 to the ethanol solution, and uniformly dissolving the solution at 170° C. for 40 minutes; after dissolution, first filtering out the undissolved matter in the dissolved system, adding deionized water, and then uniformly titrating the solution to pH = 7 with hydrochloric acid, recovering the precipitated crystals by solid-liquid separation, then placing the precipitated crystals in a low-temperature freeze dryer for drying, and finally grinding the precipitated crystals for 6 hours to obtain a polyester fiber raw material powder;

[0041] S4, polymerization: The polyester fiber raw material prepared in S3 is subjected to a surface etching process. Specifically, sodium hydroxide is added to a 10% ethylene glycol aqueous solution, where the amount of sodium hydroxide added is 1% by weight of the water. Then, a cellulose raw material is added, stirred, and heated. The cellulose raw material is then washed with deionized water multiple times and freeze-dried to obtain a surface-modified cellulose raw material. Then, 60 kg of the surface-etched polyester fiber raw material is mixed with 5 kg of pentaerythritol stearate, 4 kg of polyethylene glycol, and 5 kg of carbon fiber, melt-mixed, and subjected to a polymerization reaction to produce a regenerated polyester polymer.

[0042] S5. Fiber Drawing: The regenerated polyester polymer is melt-spun using a screw extruder, wherein the screw diameter is 22 mm, the aspect ratio is 12 / 1, the temperatures of the first, second, and third zones of the screw are set to 275°C, 292°C, and 288°C, respectively, the pump speed is 30 r / min, the pump supply is adjusted to 9 mL / r, the spinneret aspect ratio is 1:4, the spinneret is 28 f / 0.5 mm, and the spinning speed is 400 m / min, and fibrous regenerated polyester yarn is formed through melting and extrusion;

[0043] S6, Spinning: The regenerated polyester yarn is spun, and the fiber prepared in S5 is balanced for 12 hours and then stretched on a stretching machine. The temperature of the hot plate is set to 70°C, the temperature of the hot plate is set to 140°C, and the stretch ratio is adjusted to 3.8 for stretching to obtain finished fiber, which is then twisted to form yarn.

[0044] Example 2

[0045] This embodiment discloses a method for producing a regenerated environmentally friendly composite yarn, comprising the following steps:

[0046] S1. Raw material preparation: collecting and sorting waste polyester cellulose materials. In this embodiment, waste polyester yarn is used to remove impurities and pollutants.

[0047] S2, cellulose: the waste polyester cellulose material is mechanically crushed and processed to produce cellulose raw materials with a length of 10 mm;

[0048] S3, regeneration: extracting the cellulose raw material to obtain a polyester fiber raw material, specifically, the extraction operation is as follows: dissolving potassium hydroxide in an ethanol solution to obtain a 10% potassium hydroxide ethanol solution, then adding dioxane by weight of the potassium hydroxide and mixing evenly, then adding the cellulose raw material obtained in S2 to the ethanol solution, and uniformly dissolving the solution at 170° C. for 40 minutes; after dissolution, first filtering out the undissolved matter in the dissolved system, adding deionized water, and then uniformly titrating the solution to pH = 7 with hydrochloric acid, recovering the precipitated crystals by solid-liquid separation, then placing the precipitated crystals in a low-temperature freeze dryer for drying, and finally grinding the precipitated crystals for 6 hours to obtain a polyester fiber raw material powder;

[0049] S4, polymerization: The polyester fiber raw material prepared in S3 is subjected to a surface etching process. Specifically, sodium hydroxide is added to a 10% ethylene glycol aqueous solution in an amount of 1% by weight of the water. Then, a cellulose raw material is added, stirred, and heated. Then, 70 kg of the surface-etched polyester fiber raw material is mixed with 10 kg of pentaerythritol stearate, 5 kg of polyethylene glycol, and 6 kg of carbon fiber to form a melt-polymerized reaction to produce a regenerated polyester polymer.

[0050] S5. Fiber Drawing: The regenerated polyester polymer is melt-spun using a screw extruder, wherein the screw diameter is 22 mm, the aspect ratio is 12 / 1, the temperatures of the first, second, and third zones of the screw are set to 275°C, 292°C, and 288°C, respectively, the pump speed is 30 r / min, the pump supply is adjusted to 9 mL / r, the spinneret aspect ratio is 1:4, the spinneret is 28 f / 0.5 mm, and the spinning speed is 400 m / min, and fibrous regenerated polyester yarn is formed through melting and extrusion;

[0051] S6, Spinning: The regenerated polyester yarn is spun, and the fiber prepared in S5 is balanced for 12 hours and then stretched on a stretching machine. The temperature of the hot plate is set to 70°C, the temperature of the hot plate is set to 140°C, and the stretch ratio is adjusted to 3.8 for stretching to obtain finished fiber, which is then twisted to form yarn.

[0052] Example 3

[0053] This embodiment discloses a method for producing a regenerated environmentally friendly composite yarn, comprising the following steps:

[0054] S1. Raw material preparation: collecting and sorting waste polyester cellulose materials. In this embodiment, waste polyester yarn is used to remove impurities and pollutants.

[0055] S2, cellulose: the waste polyester cellulose material is mechanically crushed and processed to produce cellulose raw materials with a length of 10 mm;

[0056] S3, regeneration: extracting the cellulose raw material to obtain a polyester fiber raw material, specifically, the extraction operation is as follows: dissolving potassium hydroxide in an ethanol solution to obtain a 10% potassium hydroxide ethanol solution, then adding dioxane by weight of the potassium hydroxide and mixing evenly, then adding the cellulose raw material obtained in S2 to the ethanol solution, and uniformly dissolving the solution at 170° C. for 40 minutes; after dissolution, first filtering out the undissolved matter in the dissolved system, adding deionized water, and then uniformly titrating the solution to pH = 7 with hydrochloric acid, recovering the precipitated crystals by solid-liquid separation, then placing the precipitated crystals in a low-temperature freeze dryer for drying, and finally grinding the precipitated crystals for 6 hours to obtain a polyester fiber raw material powder;

[0057] S4, polymerization: The polyester fiber raw material prepared in S3 is subjected to a surface etching process. Specifically, sodium hydroxide is added to a 10% ethylene glycol aqueous solution in an amount of 1% by weight of the water. Then, a cellulose raw material is added, stirred, and heated. Then, 80 kg of the surface-etched polyester fiber raw material is mixed with 15 kg of pentaerythritol stearate, 6 kg of polyethylene glycol, and 7 kg of carbon fiber to form a melt-polymerized reaction to produce a regenerated polyester polymer.

[0058] S5. Fiber Drawing: The regenerated polyester polymer is melt-spun using a screw extruder, wherein the screw diameter is 22 mm, the aspect ratio is 12 / 1, the temperatures of the first, second, and third zones of the screw are set to 275°C, 292°C, and 288°C, respectively, the pump speed is 30 r / min, the pump supply is adjusted to 9 mL / r, the spinneret aspect ratio is 1:4, the spinneret is 28 f / 0.5 mm, and the spinning speed is 400 m / min, and fibrous regenerated polyester yarn is formed through melting and extrusion;

[0059] S6, Spinning: The regenerated polyester yarn is spun, and the fiber prepared in S5 is balanced for 12 hours and then stretched on a stretching machine. The temperature of the hot plate is set to 70°C, the temperature of the hot plate is set to 140°C, and the stretch ratio is adjusted to 3.8 for stretching to obtain finished fiber, which is then twisted to form yarn.

[0060] Example 4

[0061] This embodiment discloses a method for producing a regenerated environmentally friendly composite yarn, comprising the following steps:

[0062] S1. Raw material preparation: collecting and sorting waste polyester cellulose materials. In this embodiment, waste polyester yarn is used to remove impurities and pollutants.

[0063] S2, cellulose: the waste polyester cellulose material is mechanically crushed and processed to produce cellulose raw materials with a length of 10 mm;

[0064] S3, regeneration: extracting the cellulose raw material to obtain a polyester fiber raw material, specifically, the extraction operation is as follows: dissolving potassium hydroxide in an ethanol solution to obtain a 10% potassium hydroxide ethanol solution, then adding dioxane by weight of the potassium hydroxide and mixing evenly, then adding the cellulose raw material obtained in S2 to the ethanol solution, and uniformly dissolving the solution at 170° C. for 40 minutes; after dissolution, first filtering out the undissolved matter in the dissolved system, adding deionized water, and then uniformly titrating the solution to pH = 7 with hydrochloric acid, recovering the precipitated crystals by solid-liquid separation, then placing the precipitated crystals in a low-temperature freeze dryer for drying, and finally grinding the precipitated crystals for 6 hours to obtain a polyester fiber raw material powder;

[0065] S4, polymerization: 70 kg of the polyester fiber raw material prepared in S3, 10 kg of pentaerythritol stearate, 5 kg of polyethylene glycol and 6 kg of carbon fiber were mixed and melted to perform polymerization reaction to generate a regenerated polyester polymer;

[0066] S5. Fiber Drawing: The regenerated polyester polymer is melt-spun using a screw extruder, wherein the screw diameter is 22 mm, the aspect ratio is 12 / 1, the temperatures of the first, second, and third zones of the screw are set to 275°C, 292°C, and 288°C, respectively, the pump speed is 30 r / min, the pump supply is adjusted to 9 mL / r, the spinneret aspect ratio is 1:4, the spinneret is 28 f / 0.5 mm, and the spinning speed is 400 m / min, and fibrous regenerated polyester yarn is formed through melting and extrusion;

[0067] S6, Spinning: The regenerated polyester yarn is spun, and the fiber prepared in S5 is balanced for 12 hours and then stretched on a stretching machine. The temperature of the hot plate is set to 70°C, the temperature of the hot plate is set to 140°C, and the stretch ratio is adjusted to 3.8 for stretching to obtain finished fiber, which is then twisted to form yarn.

[0068] Comparative Example

[0069] Comparative Example 1

[0070] This comparative example discloses a method for producing a regenerated environmentally friendly composite yarn, comprising the following steps:

[0071] S1. Raw material preparation: collecting and sorting waste polyester cellulose materials. In this embodiment, waste polyester yarn is used to remove impurities and pollutants.

[0072] S2, cellulose: the waste polyester cellulose material is mechanically crushed and processed to produce cellulose raw materials with a length of 10 mm;

[0073] S3, regeneration: extracting the cellulose raw material to obtain a polyester fiber raw material, specifically, the extraction operation is as follows: dissolving potassium hydroxide in an ethanol solution to obtain a 10% potassium hydroxide ethanol solution, then adding dioxane by weight of the potassium hydroxide and mixing evenly, then adding the cellulose raw material obtained in S2 to the ethanol solution, and uniformly dissolving the solution at 170° C. for 40 minutes; after dissolution, first filtering out the undissolved matter in the dissolved system, adding deionized water, and then uniformly titrating the solution to pH = 7 with hydrochloric acid, recovering the precipitated crystals by solid-liquid separation, then placing the precipitated crystals in a low-temperature freeze dryer for drying, and finally grinding the precipitated crystals for 6 hours to obtain a polyester fiber raw material powder;

[0074] S4, polymerization: The polyester fiber raw material prepared in S3 is subjected to a surface etching process. Specifically, sodium hydroxide is added to a 10% ethylene glycol aqueous solution in an amount of 1% by weight of the water. Then, a cellulose raw material is added, stirred, and heated. Then, 70 kg of the polyester fiber raw material subjected to the surface etching process is mixed and melted to perform a polymerization reaction to produce a regenerated polyester polymer.

[0075] S5. Fiber Drawing: The regenerated polyester polymer is melt-spun using a screw extruder, wherein the screw diameter is 22 mm, the aspect ratio is 12 / 1, the temperatures of the first, second, and third zones of the screw are set to 275°C, 292°C, and 288°C, respectively, the pump speed is 30 r / min, the pump supply is adjusted to 9 mL / r, the spinneret aspect ratio is 1:4, the spinneret is 28 f / 0.5 mm, and the spinning speed is 400 m / min, and fibrous regenerated polyester yarn is formed through melting and extrusion;

[0076] S6, Spinning: The regenerated polyester yarn is spun, and the fiber prepared in S5 is balanced for 12 hours and then stretched on a stretching machine. The temperature of the hot plate is set to 70°C, the temperature of the hot plate is set to 140°C, and the stretch ratio is adjusted to 3.8 for stretching to obtain finished fiber, which is then twisted to form yarn.

[0077] Comparative Example 2

[0078] This comparative example discloses a method for producing a regenerated environmentally friendly composite yarn, comprising the following steps:

[0079] S1. Raw material preparation: collecting and sorting waste polyester cellulose materials. In this embodiment, waste polyester yarn is used to remove impurities and pollutants.

[0080] S2, cellulose: the waste polyester cellulose material is mechanically crushed and processed to produce cellulose raw materials with a length of 10 mm;

[0081] S3, regeneration: extracting the cellulose raw material to obtain a polyester fiber raw material, specifically, the extraction operation is as follows: dissolving potassium hydroxide in an ethanol solution to obtain a 10% potassium hydroxide ethanol solution, then adding dioxane by weight of the potassium hydroxide and mixing evenly, then adding the cellulose raw material obtained in S2 to the ethanol solution, and uniformly dissolving the solution at 170° C. for 40 minutes; after dissolution, first filtering out the undissolved matter in the dissolved system, adding deionized water, and then uniformly titrating the solution to pH = 7 with hydrochloric acid, recovering the precipitated crystals by solid-liquid separation, then placing the precipitated crystals in a low-temperature freeze dryer for drying, and finally grinding the precipitated crystals for 6 hours to obtain a polyester fiber raw material powder;

[0082] S4, polymerization: taking 70 kg of the polyester fiber raw material prepared in S3, mixing and melting, and performing polymerization reaction to generate regenerated polyester polymer;

[0083] S5. Fiber Drawing: The regenerated polyester polymer is melt-spun using a screw extruder, wherein the screw diameter is 22 mm, the aspect ratio is 12 / 1, the temperatures of the first, second, and third zones of the screw are set to 275°C, 292°C, and 288°C, respectively, the pump speed is 30 r / min, the pump supply is adjusted to 9 mL / r, the spinneret aspect ratio is 1:4, the spinneret is 28 f / 0.5 mm, and the spinning speed is 400 m / min, and fibrous regenerated polyester yarn is formed through melting and extrusion;

[0084] S6, Spinning: The regenerated polyester yarn is spun, and the fiber prepared in S5 is balanced for 12 hours and then stretched on a stretching machine. The temperature of the hot plate is set to 70°C, the temperature of the hot plate is set to 140°C, and the stretch ratio is adjusted to 3.8 for stretching to obtain finished fiber, which is then twisted to form yarn.

[0085] Comparative Example 3

[0086] This comparative example discloses a method for producing a regenerated environmentally friendly composite yarn, comprising the following steps:

[0087] S1. Raw material preparation: collecting and sorting waste polyester cellulose materials. In this embodiment, waste polyester yarn is used to remove impurities and pollutants.

[0088] S2, cellulose: the waste polyester cellulose material is mechanically crushed and processed to produce cellulose raw materials with a length of 10 mm;

[0089] S3, regeneration: melting the cellulose raw material and performing polymerization reaction to generate regenerated polyester polymer;

[0090] S4, Fiber Drawing: The regenerated polyester polymer is melt-spun using a screw extrusion, wherein the screw diameter is 22 mm, the aspect ratio is 12 / 1, the temperatures of the first, second, and third zones of the screw are set to 275°C, 292°C, and 288°C, respectively, the pump speed is 30 r / min, the pump supply is adjusted to 9 mL / r, the spinneret aspect ratio is 1:4, the spinneret is 28f / 0.5mm, and the spinning speed is 400 m / min, and fibrous regenerated polyester yarn is formed through melting and extrusion;

[0091] S5, Spinning: The regenerated polyester yarn was spun, and the fiber obtained from S5 was balanced for 12 hours and then stretched on a stretching machine. The temperature of the hot plate was set to 70°C, the temperature of the hot plate was set to 140°C, and the stretch ratio was adjusted to 3.8 for stretching to obtain the finished fiber, which was then twisted to form yarn.

[0092] Performance testing

[0093] The average breaking strength and average breaking elongation were tested with reference to GB / T 14337-2008 “Test method for tensile properties of chemical staple fibers”.

[0094] Table 1 Performance test data table

[0095]

[0096]

[0097] Combining Example 2 and Example 4 with Table 1, it can be seen that the surface roughness of the cellulose raw material subjected to surface etching modification is improved, which is more conducive to the combination of the fiber reinforcement and the auxiliary fiber therewith. During the melting process, since the fiber reinforcement and the auxiliary fiber are both combined with the surface etching modification cellulose raw material, the melt bonding degree is better, so that the performance of the finally formed polyester fiber is better.

[0098] Combining Example 2, Comparative Example 1 and Comparative Example 2 and Table 1, it can be seen that during the melt extrusion process, the fiber reinforcement and the auxiliary fiber first reinforce the cellulose raw material, so that the performance of the formed polyester fiber is enhanced. At the same time, the addition of the crystallization accelerator increases the crystallinity of the regenerated polyester fiber, thereby further improving the performance of the regenerated polyester fiber.

[0099] From Example 2 and Comparative Example 3 and Table 1, it can be seen that the polyester fibers in the waste material are first dissolved, the insoluble matter is filtered out, and then the dissolved polyester fibers are recovered, thereby effectively reducing impurities in the polyester fibers and improving the purity of the polyester fibers. The improved purity of the polyester fibers is conducive to maintaining excellent performance of the finally formed polyester yarn.

[0100] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for producing a regenerated environmentally friendly composite yarn, characterized in that: The following steps are involved: S1. Raw material preparation: Collect and sort waste polyester cellulose materials to remove impurities and pollutants; S2, cellulose: processing the waste polyester cellulose material to produce cellulose raw materials; S3, regeneration: extracting the cellulose raw material to obtain polyester fiber raw material powder; the specific extraction operation is to dissolve potassium hydroxide in an ethanol solution to obtain an ethanol solution with a mass fraction of 10% potassium hydroxide, then add dioxane with the same weight as the potassium hydroxide and mix evenly, then add the cellulose raw material obtained in S2 to the ethanol solution, and evenly dissolve it at 170°C for 40 minutes; after dissolution, first filter out the undissolved matter in the dissolved system, add deionized water, and then evenly titrate the solution with hydrochloric acid to pH=7, recover the precipitated crystals by solid-liquid separation, then place them in a low-temperature freeze dryer for drying, and finally grind them for 6 hours to obtain polyester fiber raw material powder; S4, polymerization: the polyester fiber raw material powder prepared in S3 is mixed with other raw materials for polymerization reaction to generate regenerated polyester polymer; the polyester fiber raw material powder prepared in S3 is subjected to surface etching processing, specifically, sodium hydroxide is added to a 10% ethylene glycol aqueous solution, the amount of sodium hydroxide added is 1% by weight of the water, and then the polyester fiber raw material powder is added, stirred and heated; then 60-80 parts of the polyester fiber raw material powder after the surface etching processing is mixed with 5-15 parts of a fiber reinforcement, 4-6 parts of a crystallization accelerator and 5-7 parts of an auxiliary fiber, melted and polymerized to generate regenerated polyester polymer; the auxiliary fiber is a carbon fiber; S5, drawing: the recycled polyester polymer is melted and extruded to form fibrous recycled polyester yarn; S6. Spinning: The regenerated polyester yarn is spun and formed into yarn through stretching and twisting.

2. The method for producing the regenerated environmentally friendly composite yarn according to claim 1, characterized in that: The processing method in the S2 celluloseization includes mechanical crushing.

3. The method for producing the regenerated environmentally friendly composite yarn according to claim 1, characterized in that: The fiber reinforcement includes pentaerythritol stearate.

4. The method for producing the regenerated environmentally friendly composite yarn according to claim 3, characterized in that: The crystallization promoter includes polyethylene glycol.

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