Spandex waste silk recycling regenerated high-elasticity fiber

Abstract

The invention relates to the technical field of recycling of waste spandex filaments, in particular to a regenerated high-elasticity fiber prepared by recycling the waste spandex filaments, the waste spandex filaments are converted into high-performance materials such as regenerated polyurethane through advanced technologies such as melting thermal degradation, resource recycling can be achieved, resource waste is reduced, and the regenerated high-elasticity fiber is prepared. Spandex waste silk is treated by adopting a melting thermal degradation technology, and a high-quality regenerated polyurethane raw material can be obtained by accurately controlling degradation conditions and parameters, so that a foundation is laid for subsequent preparation of high-performance fibers; secondly, in the preparation process of the modified thermoplastic polyester elastomer and the modified filler component, a silane coupling agent is adopted for chemical modification treatment, so that not only can the surface performance of the material be improved, but also the interaction force between the materials can be enhanced, and the overall performance of the fiber is improved; in the process of preparing the regenerated high-elasticity fiber, uniform mixing and full reaction of all the components can be ensured by adopting the technologies of internal mixing, extrusion and the like, so that the regenerated fiber with excellent performance is prepared.

Description

Technical Field

[0001] The invention relates to the technical field of recycling spandex waste, and in particular to regenerated high-elastic fibers using recycled spandex waste. Background Art

[0002] In the textile industry, spandex, as a high-performance elastic fiber, is widely used in various types of clothing, sports equipment and medical supplies due to its excellent elastic recovery and wear resistance. However, with the widespread use of spandex fiber, the problem of waste silk generated in its production process has become increasingly prominent. These waste silks not only occupy a large amount of storage space, but also may cause potential pollution to the environment, while wasting precious resources.

[0003] With the increasing global attention to sustainable development, the textile industry has a growing demand for environmentally friendly, high-performance recycled fiber materials. More and more companies have begun to explore the recycling technology of spandex waste in order to achieve resource recycling and environmental protection. Therefore, how to recycle and reuse spandex waste to prepare highly elastic fibers for repeated use has become a technical problem that needs to be urgently solved in this field. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for recycling spandex waste yarn to regenerate high-elastic fibers, aiming to be able to recycle spandex waste yarn to prepare high-elastic fibers.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A high-elastic fiber recycled from waste spandex, the high-elastic fiber recycled from waste spandex consisting of the following components: recycled polyurethane from waste spandex, modified thermoplastic polyester elastomer and modified filler component; The recycled polyurethane using spandex waste is prepared with the melt thermal degradation product of spandex waste and polytetrahydrofuran diol as main raw materials; The modified thermoplastic polyester elastomer is prepared with polyborosiloxane and silane coupling agent KH-550 as main raw materials; The modified filler component is prepared by mixing nano titanium dioxide, nano silicon dioxide and graphene oxide and then modifying them with a silane coupling agent KH-570.

[0006] Furthermore, the preparation method of the spandex waste melt thermal degradation product is: Pour the spandex waste into deionized water and ultrasonically disperse it at a frequency of 30 kHz for 30 minutes. After filtering out the filtrate, dry it in an oven at 60°C for 24 hours to complete the cleaning treatment. The cleaned spandex waste, triethyl phosphate and acetamide are mixed in a weight ratio of 10:20:1 and placed in a flask under a nitrogen atmosphere at a temperature of 170°C for condensation reflux thermal degradation. The result after thermal degradation for 30 minutes is the molten thermal degradation product of the spandex waste.

[0007] Furthermore, the preparation method of recycled polyurethane by recycling spandex waste is: Weigh 45g of polytetrahydrofuran diol with a relative molecular weight of 2000 and vacuum dehydrate it at a temperature of 110°C for 1h, pour it into a mixing container and add 5g of the molten thermal degradation product of waste spandex for blending, stir at a stirring speed of 200r / min for 30min, then add 10g of toluene diisocyanate at a temperature of 60°C, stir at a stirring speed of 150r / min for 30min, and then cool to room temperature to obtain the recycled polyurethane obtained by recycling waste spandex.

[0008] Furthermore, the preparation method of the polyborosiloxane is: Pour 100g of terminal hydroxyl polydimethylsiloxane with a hydroxyl mass fraction of 4% into a vacuum kneader, seal the kettle, stir and heat to 110°C at a stirring speed of 100r / min, then add 4g of boric acid, continue to seal the kettle, stir and heat to 180°C at a stirring speed of 100r / min, then evacuate, then react at a constant temperature of 180°C for 2h, and cool to room temperature to obtain polyborosiloxane.

[0009] Furthermore, the preparation steps of the modified thermoplastic polyester elastomer are: Step 1, 0.2 g of silane coupling agent KH-550 and 3 g of polyborosiloxane were mixed, and the mixture was stirred at a stirring speed of 200 r / min for 20 min to obtain a pretreated polyborosiloxane component; Step 2, 97 g of thermoplastic polyester elastomer was placed in an oven at 90° C. and dried for 4 h, and then poured into an internal mixer together with the pretreated polyborosiloxane component, melt-blended at 220° C. and stirred at a constant temperature for 10 min, and then crushed after cooling to room temperature, and the obtained particles were recorded as fragments; Step 3: pour the fragmented particles into the feeding barrel of the strand pelletizer, heat up in stages, melt-extrude the strip blend, and water-cool and pelletize to obtain the modified thermoplastic polyester elastomer.

[0010] Furthermore, the temperatures of the first, second and third zones of the staged heating in step 3 are 215° C., 220° C. and 225° C. respectively, and the die head temperature in step 3 is 230° C.

[0011] Furthermore, the preparation steps of the modified filler component are: Step A, mixing nano titanium dioxide, nano silicon dioxide and graphene oxide in a weight ratio of 1:1:2, and the obtained mixture is recorded as a filler component; Step B, dispersing 1g of silane coupling agent KH-570 in 300mL of anhydrous ethanol, adding 50g of filler component and stirring after uniform dispersion, filtering to remove the filtrate after ultrasonic dispersion and drying to obtain the modified filler component.

[0012] Furthermore, the specific operation of uniform dispersion in step B is stirring at a stirring speed of 500 r / min for 10 min, the specific operation of stirring and mixing in step B is stirring at a stirring speed of 300 r / min for 10 min, the specific operation of ultrasonic dispersion in step B is ultrasonic dispersion at a frequency of 28 kHz for 30 min, and the specific operation of drying in step B is drying in an oven at 68° C. to constant weight.

[0013] Furthermore, the preparation method of the recycled spandex waste yarn to regenerate high elastic fiber is: Weigh 30-40 parts by weight of recycled polyurethane from waste spandex, 30-40 parts by weight of modified thermoplastic polyester elastomer and 3-5 parts by weight of modified filler components, pour them into an internal mixer and mix them at 230°C for 10 minutes. After extrusion and granulation through a twin-screw extruder, they are spun into fibers through a spinning machine to obtain recycled high-elastic fibers from waste spandex.

[0014] Furthermore, in the preparation method of regenerated high-elastic fiber by recycling spandex waste, the heating box of the spinning machine adopts staged heating, and the temperatures of zones 1, 2, 3 and components are 210°C, 220°C, 230°C and 235°C respectively, and the spinning speeds are 400m / min, 500m / min, 600m / min and 750m / min respectively.

[0015] The present invention provides a method for recycling spandex waste to regenerate highly elastic fibers. Compared with the prior art, the present invention has the following beneficial effects: The present invention converts waste spandex into high-performance materials such as recycled polyurethane through advanced technologies such as melt thermal degradation, thereby realizing resource recycling and reducing resource waste. By using melt thermal degradation technology to treat waste spandex, high-quality recycled polyurethane raw materials can be obtained by precisely controlling degradation conditions and parameters, thus laying the foundation for the subsequent preparation of high-performance fibers. Secondly, in the preparation process of modified thermoplastic polyester elastomers and modified filler components, chemical modification with a silane coupling agent can not only improve the surface properties of the material, but also enhance the interaction between materials, thereby improving the overall performance of the fiber.

[0016] In the process of preparing regenerated high-elastic fibers, the use of technologies such as mixing and extrusion can ensure the uniform mixing and full reaction of each component, thereby preparing regenerated fibers with excellent performance; moreover, the use of staged heating technology and different spinning speeds in the spinning process can optimize the microstructure and properties of the fibers, which can not only improve the output and quality of the fibers, but also reduce production costs and energy consumption.

[0017] The present invention prepares regenerated high-elastic fiber by recycling spandex waste yarn, which can reduce raw material costs and improve economic benefits. Since the regenerated fiber has excellent performance, wide application fields and large market demand, it has broad market prospects and economic benefits. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0019] The present invention will be further described below in conjunction with the embodiments.

[0020] Embodiment 1: A kind of spandex waste yarn recycling regeneration high elastic fiber of this embodiment, the spandex waste yarn recycling regeneration high elastic fiber is composed of the following components: spandex waste yarn recycling regeneration polyurethane, modified thermoplastic polyester elastomer and modified filler component; Recycling of spandex waste Regenerated polyurethane is made from the melt thermal degradation products of spandex waste and polytetrahydrofuran diol as the main raw materials; The preparation method of the melt thermal degradation product of spandex waste yarn is as follows: Pour the spandex waste into deionized water and ultrasonically disperse it at a frequency of 30 kHz for 30 minutes. After filtering out the filtrate, dry it in an oven at 60°C for 24 hours to complete the cleaning treatment. The cleaned spandex waste, triethyl phosphate and acetamide are mixed in a weight ratio of 10:20:1 and placed in a flask under a nitrogen atmosphere at a temperature of 170°C for condensation reflux thermal degradation. The result after thermal degradation for 30 minutes is the molten thermal degradation product of the spandex waste.

[0021] The preparation method of recycled polyurethane by recycling spandex waste is as follows: Weigh 45g of polytetrahydrofuran diol with a relative molecular weight of 2000 and vacuum dehydrate it at a temperature of 110°C for 1h, pour it into a mixing container and add 5g of the molten thermal degradation product of waste spandex for blending, stir at a stirring speed of 200r / min for 30min, then add 10g of toluene diisocyanate at a temperature of 60°C, stir at a stirring speed of 150r / min for 30min, and then cool to room temperature to obtain the recycled polyurethane obtained by recycling waste spandex.

[0022] The modified thermoplastic polyester elastomer is prepared with polyborosiloxane and silane coupling agent KH-550 as main raw materials; Wherein, the preparation method of polyborosiloxane is: Pour 100g of terminal hydroxyl polydimethylsiloxane with a hydroxyl mass fraction of 4% into a vacuum kneader, seal the kettle, stir and heat to 110°C at a stirring speed of 100r / min, then add 4g of boric acid, continue to seal the kettle, stir and heat to 180°C at a stirring speed of 100r / min, then evacuate, then react at a constant temperature of 180°C for 2h, and cool to room temperature to obtain polyborosiloxane.

[0023] The preparation steps of the modified thermoplastic polyester elastomer are: Step 1, 0.2 g of silane coupling agent KH-550 and 3 g of polyborosiloxane were mixed, and the mixture was stirred at a stirring speed of 200 r / min for 20 min to obtain a pretreated polyborosiloxane component; Step 2, 97 g of thermoplastic polyester elastomer was placed in an oven at 90° C. and dried for 4 h, and then poured into an internal mixer together with the pretreated polyborosiloxane component, melt-blended at 220° C. and stirred at a constant temperature for 10 min, and then crushed after cooling to room temperature, and the obtained particles were recorded as fragments; Step 3, pour the fragments into the feeding barrel of the strand pelletizer, heat up in stages, melt-extrude the strip blend, and water-cool and pelletize to obtain a modified thermoplastic polyester elastomer. The temperatures of the first, second and third zones of the staged heating are 215°C, 220°C and 225°C, respectively, and the die temperature is 230°C.

[0024] The modified filler component is prepared by mixing nano titanium dioxide, nano silicon dioxide and graphene oxide and then modifying them with silane coupling agent KH-570; Wherein, the preparation steps of the modified filler component are: Step A, mixing nano titanium dioxide, nano silicon dioxide and graphene oxide in a weight ratio of 1:1:2, and the obtained mixture is recorded as a filler component; Step B: Disperse 1 g of silane coupling agent KH-570 in 300 mL of anhydrous ethanol, stir at a stirring speed of 500 r / min for 10 min, add 50 g of filler component and stir at a stirring speed of 300 r / min for 10 min, ultrasonically disperse at a frequency of 28 kHz for 30 min, filter to remove the filtrate and place in an oven at 68°C to dry to constant weight, and the resulting modified filler component is obtained.

[0025] The preparation method of regenerated high elastic fiber by recycling spandex waste is as follows: Weigh 30 parts by weight of recycled polyurethane from waste spandex, 30 parts by weight of modified thermoplastic polyester elastomer and 3 parts by weight of modified filler components, pour them into an internal mixer and mix them at 230°C for 10 minutes. After extrusion and granulation through a twin-screw extruder, they are spun into fibers through a spinning machine. The result is recycled high-elastic fiber from waste spandex. The heating box of the spinning machine adopts staged heating, and the temperatures of zones one, two, three and components are 210°C, 220°C, 230°C and 235°C respectively, and the spinning speeds are 400m / min, 500m / min, 600m / min and 750m / min respectively.

[0026] Embodiment 2: A kind of spandex waste yarn recycled regenerated high elastic fiber of this embodiment, the spandex waste yarn recycled regenerated high elastic fiber is composed of the following components: spandex waste yarn recycled regenerated polyurethane, modified thermoplastic polyester elastomer and modified filler component; Recycling of spandex waste Regenerated polyurethane is made from the melt thermal degradation products of spandex waste and polytetrahydrofuran diol as the main raw materials; The preparation method of the melt thermal degradation product of spandex waste yarn is as follows: Pour the spandex waste into deionized water and ultrasonically disperse it at a frequency of 30 kHz for 30 minutes. After filtering out the filtrate, dry it in an oven at 60°C for 24 hours to complete the cleaning treatment. The cleaned spandex waste, triethyl phosphate and acetamide are mixed in a weight ratio of 10:20:1 and placed in a flask under a nitrogen atmosphere at a temperature of 170°C for condensation reflux thermal degradation. The result after thermal degradation for 30 minutes is the molten thermal degradation product of the spandex waste.

[0027] The preparation method of recycled polyurethane by recycling spandex waste is as follows: Weigh 45g of polytetrahydrofuran diol with a relative molecular weight of 2000 and vacuum dehydrate it at a temperature of 110°C for 1h, pour it into a mixing container and add 5g of the molten thermal degradation product of waste spandex for blending, stir at a stirring speed of 200r / min for 30min, then add 10g of toluene diisocyanate at a temperature of 60°C, stir at a stirring speed of 150r / min for 30min, and then cool to room temperature to obtain the recycled polyurethane obtained by recycling waste spandex.

[0028] The modified thermoplastic polyester elastomer is prepared with polyborosiloxane and silane coupling agent KH-550 as main raw materials; Wherein, the preparation method of polyborosiloxane is: Pour 100g of terminal hydroxyl polydimethylsiloxane with a hydroxyl mass fraction of 4% into a vacuum kneader, seal the kettle, stir and heat to 110°C at a stirring speed of 100r / min, then add 4g of boric acid, continue to seal the kettle, stir and heat to 180°C at a stirring speed of 100r / min, then evacuate, then react at a constant temperature of 180°C for 2h, and cool to room temperature to obtain polyborosiloxane.

[0029] The preparation steps of the modified thermoplastic polyester elastomer are: Step 1, 0.2 g of silane coupling agent KH-550 and 3 g of polyborosiloxane were mixed, and the mixture was stirred at a stirring speed of 200 r / min for 20 min to obtain a pretreated polyborosiloxane component; Step 2, 97 g of thermoplastic polyester elastomer was placed in an oven at 90° C. and dried for 4 h, and then poured into an internal mixer together with the pretreated polyborosiloxane component, melt-blended at 220° C. and stirred at a constant temperature for 10 min, and then crushed after cooling to room temperature, and the obtained particles were recorded as fragments; Step 3, pour the fragments into the feeding barrel of the strand pelletizer, heat up in stages, melt-extrude the strip blend, and water-cool and pelletize to obtain a modified thermoplastic polyester elastomer. The temperatures of the first, second and third zones of the staged heating are 215°C, 220°C and 225°C, respectively, and the die temperature is 230°C.

[0030] The modified filler component is prepared by mixing nano titanium dioxide, nano silicon dioxide and graphene oxide and then modifying them with silane coupling agent KH-570; Wherein, the preparation steps of the modified filler component are: Step A, mixing nano titanium dioxide, nano silicon dioxide and graphene oxide in a weight ratio of 1:1:2, and the obtained mixture is recorded as a filler component; Step B: Disperse 1 g of silane coupling agent KH-570 in 300 mL of anhydrous ethanol, stir at a stirring speed of 500 r / min for 10 min, add 50 g of filler component and stir at a stirring speed of 300 r / min for 10 min, ultrasonically disperse at a frequency of 28 kHz for 30 min, filter to remove the filtrate and place in an oven at 68°C to dry to constant weight, and the resulting modified filler component is obtained.

[0031] The preparation method of regenerated high elastic fiber by recycling spandex waste is as follows: Weigh 40 parts by weight of recycled polyurethane from waste spandex, 40 parts by weight of modified thermoplastic polyester elastomer and 5 parts by weight of modified filler components, pour them into an internal mixer and mix them at 230°C for 10 minutes. After extrusion and granulation through a twin-screw extruder, they are spun into fibers through a spinning machine. The result is recycled high-elastic fiber from waste spandex. The heating box of the spinning machine adopts staged heating, and the temperatures of zones one, two, three and components are 210°C, 220°C, 230°C and 235°C respectively, and the spinning speeds are 400m / min, 500m / min, 600m / min and 750m / min respectively.

[0032] Embodiment 3: A kind of spandex waste yarn recycling regeneration high elastic fiber of this embodiment, the spandex waste yarn recycling regeneration high elastic fiber is composed of the following components: spandex waste yarn recycling regeneration polyurethane, modified thermoplastic polyester elastomer and modified filler component; Recycling of spandex waste Regenerated polyurethane is made from the melt thermal degradation products of spandex waste and polytetrahydrofuran diol as the main raw materials; The preparation method of the melt thermal degradation product of spandex waste yarn is as follows: Pour the spandex waste into deionized water and ultrasonically disperse it at a frequency of 30 kHz for 30 minutes. After filtering out the filtrate, dry it in an oven at 60°C for 24 hours to complete the cleaning treatment. The cleaned spandex waste, triethyl phosphate and acetamide are mixed in a weight ratio of 10:20:1 and placed in a flask under a nitrogen atmosphere at a temperature of 170°C for condensation reflux thermal degradation. The result after thermal degradation for 30 minutes is the molten thermal degradation product of the spandex waste.

[0033] The preparation method of recycled polyurethane by recycling spandex waste is as follows: Weigh 45g of polytetrahydrofuran diol with a relative molecular weight of 2000 and vacuum dehydrate it at a temperature of 110°C for 1h, pour it into a mixing container and add 5g of the molten thermal degradation product of waste spandex for blending, stir at a stirring speed of 200r / min for 30min, then add 10g of toluene diisocyanate at a temperature of 60°C, stir at a stirring speed of 150r / min for 30min, and then cool to room temperature to obtain the recycled polyurethane obtained by recycling waste spandex.

[0034] The modified thermoplastic polyester elastomer is prepared with polyborosiloxane and silane coupling agent KH-550 as main raw materials; Wherein, the preparation method of polyborosiloxane is: Pour 100g of terminal hydroxyl polydimethylsiloxane with a hydroxyl mass fraction of 4% into a vacuum kneader, seal the kettle, stir and heat to 110°C at a stirring speed of 100r / min, then add 4g of boric acid, continue to seal the kettle, stir and heat to 180°C at a stirring speed of 100r / min, then evacuate, then react at a constant temperature of 180°C for 2h, and cool to room temperature to obtain polyborosiloxane.

[0035] The preparation steps of the modified thermoplastic polyester elastomer are: Step 1, 0.2 g of silane coupling agent KH-550 and 3 g of polyborosiloxane were mixed, and the mixture was stirred at a stirring speed of 200 r / min for 20 min to obtain a pretreated polyborosiloxane component; Step 2, 97 g of thermoplastic polyester elastomer was placed in an oven at 90° C. and dried for 4 h, and then poured into an internal mixer together with the pretreated polyborosiloxane component, melt-blended at 220° C. and stirred at a constant temperature for 10 min, and then crushed after cooling to room temperature, and the obtained particles were recorded as fragments; Step 3, pour the fragments into the feeding barrel of the strand pelletizer, heat up in stages, melt-extrude the strip blend, and water-cool and pelletize to obtain a modified thermoplastic polyester elastomer. The temperatures of the first, second and third zones of the staged heating are 215°C, 220°C and 225°C, respectively, and the die temperature is 230°C.

[0036] The modified filler component is prepared by mixing nano titanium dioxide, nano silicon dioxide and graphene oxide and then modifying them with silane coupling agent KH-570; Wherein, the preparation steps of the modified filler component are: Step A, mixing nano titanium dioxide, nano silicon dioxide and graphene oxide in a weight ratio of 1:1:2, and the obtained mixture is recorded as a filler component; Step B: Disperse 1 g of silane coupling agent KH-570 in 300 mL of anhydrous ethanol, stir at a stirring speed of 500 r / min for 10 min, add 50 g of filler component and stir at a stirring speed of 300 r / min for 10 min, ultrasonically disperse at a frequency of 28 kHz for 30 min, filter to remove the filtrate and place in an oven at 68°C to dry to constant weight, and the resulting modified filler component is obtained.

[0037] The preparation method of regenerated high elastic fiber by recycling spandex waste is as follows: Weigh 35 parts by weight of recycled polyurethane from waste spandex, 35 parts by weight of modified thermoplastic polyester elastomer and 4 parts by weight of modified filler components, pour them into an internal mixer and mix them at 230°C for 10 minutes. After extrusion and granulation through a twin-screw extruder, they are spun into fibers through a spinning machine. The result is recycled high-elastic fiber from waste spandex. The heating box of the spinning machine adopts staged heating, and the temperatures of zones one, two, three and components are 210°C, 220°C, 230°C and 235°C respectively, and the spinning speeds are 400m / min, 500m / min, 600m / min and 750m / min respectively.

[0038] Comparative Example 1: The recycled high-elastic fiber obtained by recycling waste spandex provided in this comparative example is substantially the same as that in Example 1, the main difference being that the modified thermoplastic polyester elastomer in Example 1 is replaced by thermoplastic polyester elastomer TPEE.

[0039] Comparative Example 2: The high-elastic fiber regenerated by recycling waste spandex provided in this comparative example is substantially the same as that in Example 1, with the main difference being that the modified filler component in Example 1 is replaced by nano titanium dioxide in this comparative example 2.

[0040] Comparative Example 3: The regenerated high-elastic fiber obtained by recycling waste spandex provided in this comparative example is substantially the same as that in Example 1, with the main difference being that the modified filler component in Example 1 is replaced with nano-silicon dioxide in this comparative example 3.

[0041] Comparative Example 4 The recycled high-elastic fiber obtained by recycling waste spandex provided in this comparative example is substantially the same as that in Example 1, with the main difference being that the modified filler component in Example 1 is replaced by graphene oxide in this comparative example 4.

[0042] The recycled spandex waste fibers prepared in Examples 1-3 and Comparative Examples 1-3 were marked as Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4, respectively. The properties of Examples 1-3 and Comparative Examples 1-4 were tested. The specific testing methods and test items are as follows: 1. The tensile strength and elongation at break of Examples 1-3 and Comparative Examples 1-4 were tested with reference to the standard of GB / T 1040.1-2018, and the obtained data are recorded in the following table; 2. The modulus of Examples 1-3 and Comparative Examples 1-4 was tested with reference to the standard of GB / T19975-2005, and the obtained data were recorded in the following table; Tensile strength / MPa Elongation at break / % Modulus / cN / dtex Example 1 30.26 367 935 Example 2 30.17 359 910 Example 3 31.65 348 920 Comparative Example 1 21.68 319 755 Comparative Example 2 25.47 338 760 Comparative Example 3 26.15 326 795 Comparative Example 4 25.89 314 780 It can be seen from the data in the above table that the tensile strength and modulus of the regenerated high elastic fibers recycled from spandex waste in the present embodiments 1-3 are greater than those in the comparative examples 1-4, indicating that adding modified thermoplastic polyester elastomer and modified filler components in the preparation of the regenerated high elastic fibers recycled from spandex waste can improve the performance. Therefore, the regenerated high elastic fibers recycled from spandex waste prepared in the present invention have excellent market application prospects.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for recycling spandex waste yarn to regenerate high elastic fiber, characterized in that: The recycled high elastic fiber from waste spandex yarn is composed of the following components: recycled polyurethane from waste spandex yarn, modified thermoplastic polyester elastomer and modified filler component; The recycled polyurethane using spandex waste is prepared with the melt thermal degradation product of spandex waste and polytetrahydrofuran diol as main raw materials; The modified thermoplastic polyester elastomer is prepared with polyborosiloxane and silane coupling agent KH-550 as main raw materials; The modified filler component is prepared by mixing nano titanium dioxide, nano silicon dioxide and graphene oxide and then modifying them with a silane coupling agent KH-570.

2. The method of recycling spandex waste yarn and regenerating high elastic fiber according to claim 1, characterized in that: The preparation method of the spandex waste melt thermal degradation product is: Pour the spandex waste into deionized water and ultrasonically disperse it at a frequency of 30 kHz for 30 minutes. After filtering out the filtrate, dry it in an oven at 60°C for 24 hours to complete the cleaning treatment. The cleaned spandex waste, triethyl phosphate and acetamide are mixed in a weight ratio of 10:20:1 and placed in a flask under a nitrogen atmosphere at a temperature of 170°C for condensation reflux thermal degradation. The result after thermal degradation for 30 minutes is the molten thermal degradation product of the spandex waste.

3. The method of recycling spandex waste yarn and regenerating high elastic fiber according to claim 1, characterized in that: The preparation method of recycled polyurethane by recycling spandex waste is as follows: Weigh 45g of polytetrahydrofuran diol with a relative molecular weight of 2000 and vacuum dehydrate it at a temperature of 110°C for 1h, pour it into a mixing container and add 5g of the molten thermal degradation product of waste spandex for blending, stir at a stirring speed of 200r / min for 30min, then add 10g of toluene diisocyanate at a temperature of 60°C, stir at a stirring speed of 150r / min for 30min, and then cool to room temperature to obtain the recycled polyurethane obtained by recycling waste spandex.

4. The method of recycling spandex waste yarn and regenerating high elastic fiber according to claim 1, characterized in that: The preparation method of the polyborosiloxane is: Pour 100g of terminal hydroxyl polydimethylsiloxane with a hydroxyl mass fraction of 4% into a vacuum kneader, seal the kettle, stir and heat to 110°C at a stirring speed of 100r / min, then add 4g of boric acid, continue to seal the kettle, stir and heat to 180°C at a stirring speed of 100r / min, then evacuate, then react at a constant temperature of 180°C for 2h, and cool to room temperature to obtain polyborosiloxane.

5. The method of recycling spandex waste yarn and regenerating high elastic fiber according to claim 1, characterized in that: The preparation steps of the modified thermoplastic polyester elastomer are: Step 1, 0.2 g of silane coupling agent KH-550 and 3 g of polyborosiloxane were mixed, and the mixture was stirred at a stirring speed of 200 r / min for 20 min to obtain a pretreated polyborosiloxane component; Step 2, 97 g of thermoplastic polyester elastomer was placed in an oven at 90° C. and dried for 4 h, and then poured into an internal mixer together with the pretreated polyborosiloxane component, melt-blended at 220° C. and stirred at a constant temperature for 10 min, and then crushed after cooling to room temperature, and the obtained particles were recorded as fragments; Step 3: pour the fragmented particles into the feeding barrel of the strand pelletizer, heat up in stages, melt-extrude the strip blend, and water-cool and pelletize to obtain the modified thermoplastic polyester elastomer.

6. The method of recycling spandex waste yarn and regenerating high elastic fiber according to claim 5, characterized in that: The temperatures of the first, second and third zones of the staged heating in step 3 are 215° C., 220° C. and 225° C. respectively, and the die head temperature in step 3 is 230° C.

7. The high elastic fiber regenerated by recycling spandex waste according to claim 1, characterized in that: The preparation steps of the modified filler component are: Step A, mixing nano titanium dioxide, nano silicon dioxide and graphene oxide in a weight ratio of 1:1:2, and the obtained mixture is recorded as a filler component; Step B, dispersing 1g of silane coupling agent KH-570 in 300mL of anhydrous ethanol, adding 50g of filler component and stirring after uniform dispersion, filtering to remove the filtrate after ultrasonic dispersion and drying to obtain the modified filler component.

8. The method of recycling spandex waste yarn and regenerating high elastic fiber according to claim 7, characterized in that: The specific operation of uniform dispersion in step B is stirring at a stirring speed of 500 r / min for 10 min, the specific operation of stirring and mixing in step B is stirring at a stirring speed of 300 r / min for 10 min, the specific operation of ultrasonic dispersion in step B is ultrasonic dispersion at a frequency of 28 kHz for 30 min, and the specific operation of drying in step B is drying in an oven at 68° C. to constant weight.

9. The high elastic fiber regenerated by recycling spandex waste according to claim 1, characterized in that: The preparation method of the regenerated high elastic fiber by recycling spandex waste is as follows: Weigh 30-40 parts by weight of recycled polyurethane from waste spandex, 30-40 parts by weight of modified thermoplastic polyester elastomer and 3-5 parts by weight of modified filler components, pour them into an internal mixer and mix them at 230°C for 10 minutes. After extrusion and granulation through a twin-screw extruder, they are spun into fibers through a spinning machine to obtain recycled high-elastic fibers from waste spandex.

10. The high elastic fiber regenerated by recycling spandex waste according to claim 9, characterized in that: In the preparation method of regenerated high-elastic fiber by recycling spandex waste, the heating box of the spinning machine adopts staged heating, and the temperatures of the first, second and third zones and the components are 210°C, 220°C, 230°C and 235°C respectively, and the spinning speeds are 400m / min, 500m / min, 600m / min and 750m / min respectively.