High-resilience spandex fiber as well as preparation method and application thereof

Abstract

The invention discloses a high-resilience spandex fiber and a preparation method and application thereof.The high-resilience spandex fiber is mainly prepared from PTMEG and MD I through polymerization, the PTMEG is used for producing a polyurethane elastomer, spandex and an ester-ether copolymerized elastomer, the MD I is a polyurethane material synthesized from isocyanate, polyhydric alcohols and matched auxiliaries of the isocyanate, the polyhydric alcohols and the matched auxiliaries of the isocyanate, the polyhydric alcohols and the matched auxiliaries of the MD I are used for producing polyurethane elastomers, the polyurethane elastomers are used for producing polyurethane elastomers, the polyurethane elastomers are used for producing polyurethane elastomers, and the MD I is used for producing polyurethane elastomers. In the spinning process of the high-resilience spandex fiber, the spandex is composed of one or more filaments, the spandex has high elasticity and good resilience, the spandex is determined by the polymer block copolymer structure of the spandex, and in the block copolymer structure, the high-resilience spandex fiber comprises the following components in percentage by mass: 60-66% of PTMEG (polytetrahydrofuran); 10 to 12% of MD (diisocyanate); 14-17% of an auxiliary material; and 9-11% of an additive. The high-resilience spandex fiber is relatively low in production efficiency, easy to break, high in elasticity and stability, not easy to deform, easy to shrink, wide in application and stable in use.

Description

Technical Field

[0001] The invention relates to the technical field of high-resilience spandex fibers, in particular to a high-resilience spandex fiber and a preparation method and application thereof. Background Art

[0002] Spandex fabric is a kind of Gutenberg stretch fiber, which belongs to a kind of elastic synthetic fiber. Because of its high elasticity and high resilience, it is widely used in tight clothing, swimsuits, yoga clothes, socks, jeans, etc., mainly used to increase the comfort and tightness of clothing. The characteristics of spandex materials are as follows: High elasticity: Spandex fabric has high elasticity, can be extended 2-6 times, remains stable in the stretched state, and rebounds quickly. Therefore, it can provide excellent tight and close-fitting effects, making the wearer feel more comfortable. Good durability and wrinkle resistance: Spandex fabric is durable, not easy to deform, fade, pilling, easy to dye, easy to clean, and not easy to wrinkle. Light and breathable: Spandex fiber is very light and breathable. In particular, spandex is blended with natural fibers such as cotton, linen, silk, and wool, and the blended fabrics made often have better breathability. Due to the excellent performance of spandex, general clothing will use blended fabrics, such as nylon and spandex, which are blended quick-drying fabrics in summer, and they are excellent in terms of wearing feeling and breathability.

[0003] Chinese patent number CN103757741 B provides a method for preparing spandex fiber with high resilience, which mainly includes the following steps: 1) mixing raw materials polytetramethylene ether glycol (PTMEG) and 4,4-diphenylmethane diisocyanate (MDI) in a solvent to obtain an isocyanate-terminated prepolymer; 2) preparing a special chain extender mixture solution, wherein the amount of UPy (2-ureido-4[1H]-pyrimidone) type diamine compound in the chain extender accounts for 5-15 mol% of the total amount; 3) gradually adding the chain extender mixture solution to the prepolymer solution while stirring, reacting to form a polyurethane urea solution; 4) spinning the above polyurethane urea solution to prepare spandex fiber with high resilience. The method for preparing spandex fiber with high resilience of the present invention solves the requirements of some application fields for high resilience of spandex.

[0004] The high-resilience spandex fiber and its preparation method and application in the prior art have relatively low production efficiency, are prone to breakage, have relatively poor high elasticity, and are easily deformed and wrinkled. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a high-elasticity, high-resilience, high-durability, non-deformation, non-shrinkage high-rebound spandex fiber and a preparation method and application thereof.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-resilience spandex fiber and a preparation method and application thereof. The technical solutions adopted are: a high-resilience spandex fiber, wherein the main raw materials of the high-resilience spandex fiber are: PTMEG (polytetrahydrofuran) and MDI (diisocyanate) polymerized, PTMEG (polytetrahydrofuran) is used to produce polyurethane elastomers, spandex and ester-ether copolymer elastomers, MDI (diisocyanate) is a polyurethane material synthesized from isocyanate, polyol and its auxiliary agent, and in the spinning process of the high-resilience spandex fiber, the spandex is composed of one or more filaments, and the mass percentage of the high-resilience spandex fiber is:

[0009]

[0010] Additives include the following reagents:

[0011] Antimicrobial agents

[0012] Anti-aging agents

[0013] Lubricants

[0014] Crosslinking agent

[0015] Curing agent.

[0016] As a preferred solution, the spandex has high elasticity and good resilience, and the spandex is determined by its high molecular block copolymer structure, in which the soft segment is composed of low molecular weight polyester or polyether chains.

[0017] A method for preparing high-resilience spandex fiber comprises the following steps:

[0018] S1. Ingredients: PTMEG (polytetrahydrofuran) and MDI (diisocyanate) are mixed in a specified ratio, with the mass percentage of PTMEG (polytetrahydrofuran) and MDI (diisocyanate) being 60-66%:10-12%, and auxiliary materials and additives are weighed at the same time;

[0019] S2. Mixing: Pour the PTMEG (polytetramethylene furan) and MDI (diisocyanate) in a good proportion into a designated container;

[0020] S3, melting: Pour the mixed PTMEG (polytetrahydrofuran) and MDI (diisocyanate) into a melting tank, start the melting tank, and fully stir the PTMEG (polytetrahydrofuran) and MDI (diisocyanate) at the same time, then add the auxiliary materials, and then stir them fully;

[0021] S4, extrusion: pouring the melted raw materials into a screw extruder, and using the screw extruder to extrude the melted raw materials through a mold for molding;

[0022] S5, filament formation and winding: at the same time, the melt extruded from the formed raw materials through the small holes of the spinneret is cooled and solidified into filaments by side blowing in the channel, and finally high-elastic spandex fiber filaments are obtained, and the high-elastic spandex fiber filaments are oiled and wound into a tube;

[0023] S6, weaving machine: then, the oiled and wound high-resilience spandex fiber yarn is put into the weaving machine, the high-resilience spandex fiber yarn is spun into spandex yarn of normal thickness, and the outer part of the spandex yarn is subjected to core-sand treatment;

[0024] S7. Testing: The obtained spandex yarn is tested by performance testing equipment to obtain qualified spandex yarn.

[0025] As a preferred solution, in S3, the temperature of the melting tank is adjusted to 120-140°C, and the speed of the stirring device is set at 800-1200r / min.

[0026] As a preferred solution, in S4, the temperature of the screw extruder is set to 130-140°C, the pre-reaction is set to 20-35 seconds, and in S5, the temperature of the air blowing cooling is set to 15-18°C.

[0027] As a preferred solution, in S6, the core-spun sand is also called elastic core-spun yarn. The main characteristics of this yarn are: good hand feel and appearance, natural fiber, and good moisture absorption; 1-10% spandex filament can be used to produce high-quality elastic yarn; the elasticity range is controlled at 10%-20%, and different elasticity values ​​are selected according to different product uses.

[0028] As a preferred embodiment, in S7, the items of spandex yarn performance testing include tensile strength, elongation at break, residual elongation, modulus, aging resistance, dyeability, minimum fineness and thermal stability.

[0029] As a preferred embodiment, in S1, the auxiliary materials include one or more mixtures of ethylenediamine, butanediamine, ethanolamine and antioxidants.

[0030] As a preferred solution, in S6, the high resilience spandex fibers are prepared into common specifications of 10D / fiber, 15D / fiber or even 20D / fiber.

[0031] The invention discloses an application of high-resilience spandex fiber, wherein the high-resilience spandex fiber is widely used in sportswear, underwear, swimsuits, socks, pants and other clothing. The spandex fiber can also be blended with other fibers, such as cotton, wool, silk and the like, to increase the elasticity and comfort of the fabric.

[0032] (III) Beneficial effects

[0033] Compared with the prior art, the present invention provides a high-resilience spandex fiber and a preparation method and application thereof, which have the following beneficial effects:

[0034] 1. The spandex obtained by the present invention is a highly elastic fiber, and its strength is 2-3 times higher than that of latex yarn. The density of spandex yarn is relatively finer, and it is also very resistant to acid and alkali, sweat, dry cleaning, and abrasion. Elasticity: the elasticity of spandex fiber can be extended to 400%-800%, which is higher than that of nylon high elastic yarn, and the resilience is more than 95%.

[0035] 2. The production efficiency of the present invention is relatively low, and it is easy to break. The high elastic stability and high resilience spandex fiber that is not easy to deform or shrink have wide applications and are stable in use. Heat resistance: There are amino bonds between spandex molecules and crystallinity within the molecules, which makes the spandex fiber have higher heat resistance, which is quite different from the heat resistance of spandex.

[0036] 3. The spandex fiber of the present invention has good wrinkle resistance, can maintain a flat surface during washing, and reduce the generation of wrinkles. Comfortability: Since the spandex fiber has good air permeability and moisture absorption, the clothes made of spandex fabric are very comfortable to wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the components of the present invention;

[0038] Figure 2 It is a schematic flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described and illustrated below in conjunction with specific embodiments and accompanying drawings:

[0040] See also Figure 1-2 The present invention discloses a high-resilience spandex fiber. The main raw materials of the high-resilience spandex fiber are: PTMEG (polytetramethylene furan) and MDI (diisocyanate) polymerized. PTMEG (polytetramethylene furan) is used to produce polyurethane elastomers, spandex and ester-ether copolymer elastomers. MDI (diisocyanate) is a polyurethane material synthesized from isocyanate, polyol and its auxiliary agent. During the spinning process of the high-resilience spandex fiber, the spandex is composed of one or more filaments. The mass percentage of the high-resilience spandex fiber is:

[0041]

[0042] Additives include the following reagents:

[0043] Antimicrobial agents

[0044] Anti-aging agents

[0045] Lubricants

[0046] Crosslinking agent

[0047] Curing agent.

[0048] As a preferred solution, spandex has high elasticity and good resilience. Spandex is determined by its high molecular block copolymer structure. In the block copolymer structure, the soft segment is composed of low molecular weight polyester or polyether chain, which can be easily deformed, so that the fiber is easily stretched and deformed, and has a large elongation performance. The hard segment is composed of diisocyanate chain, so that the molecular chain will not be infinitely elongated, and sliding between molecules is prevented, so that the fiber has high resilience and strength. In the fiber, the soft segment forms a liquid-like base layer, and the hard segment forms a hard area, which plays a cross-linking role. The basic structure of the fiber follows the typical rubber elasticity theory. There is only a weak intermolecular force like a liquid between the long chain segments that can move freely, and a three-dimensional network is formed by cross-linking at specific locations. The cross-linking is achieved by the crystalline hard segment in the hard area.

[0049] A method for preparing high-resilience spandex fiber comprises the following steps:

[0050] S1. Ingredients: PTMEG (polytetrahydrofuran) and MDI (diisocyanate) are mixed in a specified ratio, wherein the mass percentage of PTMEG (polytetrahydrofuran) and MDI (diisocyanate) is 60-66%:10-12%, and auxiliary materials and additives are weighed at the same time, wherein the auxiliary materials include one or more mixtures of ethylenediamine, butanediamine, ethanolamine and antioxidants;

[0051] S2. Mixing: Pour the PTMEG (polytetramethylene furan) and MDI (diisocyanate) in a good proportion into a designated container;

[0052] S3, melting: Pour the mixed PTMEG (polytetrahydrofuran) and MDI (diisocyanate) into a melting tank, start the melting tank, adjust the temperature of the melting tank to 120-140°C, and fully stir PTMEG (polytetrahydrofuran) and MDI (diisocyanate) at the same time, set the speed of the stirring device to 800-1200r / min, then add the auxiliary materials, and then stir fully;

[0053] S4, extrusion: pour the melted raw materials into a screw extruder, set the temperature of the screw extruder to 130-140°C, and set the pre-reaction to 20-35 seconds, and use the screw extruder to extrude the melted raw materials through the mold;

[0054] S5, filamentation and winding: at the same time, the melt extruded from the formed raw materials through the spinneret holes is cooled and solidified into filaments by side blowing in the channel, and the blowing cooling temperature is set at 15-18° C. Finally, high-elastic spandex fiber filaments are obtained, and the high-elastic spandex fiber filaments are oiled and wound into a tube;

[0055] S6, weaving machine: then put the oiled and wound high-resilience spandex fiber yarn into the weaving machine, weave the high-resilience spandex fiber yarn into spandex yarn of normal thickness, and treat the outer surface of the spandex yarn with core sand, which is also called elastic core-spun yarn. The main characteristics of this yarn are: good hand feel and appearance, natural fiber, good hygroscopicity; using 1-10% spandex filament, high-quality stretch yarn can be produced; the elasticity range is controlled at 10%-20%, and different elasticity values ​​are selected according to different product uses. The obtained high-resilience spandex fiber is prepared into common specifications of 10D / root, 15D / root and even 20D / root. In theory, the fewer the roots, the better the uniformity of the yarn, because the chance of overlapping morphology is less;

[0056] S7. Testing: The spandex yarn obtained is tested by performance testing equipment to obtain qualified spandex yarn. The performance testing items of spandex yarn include tensile strength, elongation at break, residual elongation, modulus, aging resistance, dyeability, minimum fineness and thermal stability. Elasticity: The elastic elongation of spandex fiber can reach 400% to 800%, which is higher than the elasticity of nylon high elastic yarn, and the rebound rate is more than 95%. Strength: The strength of spandex fiber is relatively high, and it is the strongest among elastic fibers. Heat resistance: Due to the hydrogen bonds between spandex molecules and the crystallinity within the molecules, spandex fiber has high heat resistance, but the heat resistance of different varieties of spandex varies greatly. Dyeability: Spandex has good dyeability and is not easy to fade. Most dyes used for polyamide fibers can be used to dye spandex fibers, especially acid dyes, disperse dyes and chromium-containing dyes. They can be dyed into various beautiful colors, have high wear resistance, good chemical resistance, and especially oil and solvent resistance.

[0057] The invention discloses an application of high-resilience spandex fiber. The high-resilience spandex fiber is widely used in sportswear, underwear, swimsuits, socks, pants and other clothing. The spandex fiber can also be blended with other fibers, such as cotton, wool, silk, etc., to increase the elasticity and comfort of the fabric.

[0058] Embodiment 1

[0059] A method for preparing high-resilience spandex fiber comprises the following steps:

[0060] S1. Ingredients: PTMEG (polytetrahydrofuran) and MDI (diisocyanate) are mixed in a specified ratio, and auxiliary materials and additives are weighed at the same time. The mass percentage of PTMEG (polytetrahydrofuran) and MDI (diisocyanate) is 60%:10%, and the auxiliary materials are 17%. The auxiliary materials include one or more mixtures of ethylenediamine, butanediamine, ethanolamine and antioxidants;

[0061] S2. Mixing: Pour the PTMEG (polytetramethylene furan) and MDI (diisocyanate) in a good proportion into a designated container;

[0062] S3, melting: Pour the mixed PTMEG (polytetrahydrofuran) and MDI (diisocyanate) into a melting tank, start the melting tank, adjust the temperature of the melting tank to 140°C, and fully stir PTMEG (polytetrahydrofuran) and MDI (diisocyanate) at the same time. The speed of the stirring device is set at 1200r / min, and then add the auxiliary materials and then stir them fully.

[0063] S4, extrusion: pour the melted raw materials into a screw extruder, set the temperature of the screw extruder to 140°C, and set the pre-reaction to 35 seconds, and use the screw extruder to extrude the melted raw materials through the mold;

[0064] S5, filamentation and winding: at the same time, the melt extruded from the formed raw materials through the spinneret holes is cooled and solidified into filaments by side blowing in the channel, and the blowing cooling temperature is set at 18° C. Finally, high-elastic spandex fiber filaments are obtained, and the high-elastic spandex fiber filaments are oiled and wound into a tube;

[0065] S6, weaving machine: then put the oiled and wound high-resilience spandex fiber yarn into the weaving machine, weave the high-resilience spandex fiber yarn into spandex yarn of normal thickness, and treat the outer part of the spandex yarn with core sand, which is also called elastic core-spun yarn. The main characteristics of this yarn are: good hand feel and appearance, natural fiber, good hygroscopicity; using 10% spandex filament, high-quality stretch yarn can be produced; the elastic range is controlled at 20%, and different elasticity values ​​are selected according to different product uses. The obtained high-resilience spandex fiber is prepared into common specifications of 15D / root. In theory, the fewer the roots, the better the uniformity of the yarn, because the chance of overlapping forms is less;

[0066] S7. Testing: The spandex yarn obtained is tested by performance testing equipment to obtain qualified spandex yarn. The spandex yarn performance testing items include tensile strength, elongation at break, residual elongation, modulus, aging resistance, dyeability, minimum fineness and thermal stability.

[0067] Embodiment 2

[0068] A method for preparing high-resilience spandex fiber comprises the following steps:

[0069] S1. Ingredients: PTMEG (polytetrahydrofuran) and MDI (diisocyanate) are mixed in a specified ratio, and auxiliary materials and additives are weighed at the same time. The mass percentage of PTMEG (polytetrahydrofuran) and MDI (diisocyanate) is 63%:11%, and the auxiliary materials are 17%. The auxiliary materials include one or more mixtures of ethylenediamine, butanediamine, ethanolamine and antioxidants;

[0070] S2. Mixing: Pour the PTMEG (polytetramethylene furan) and MDI (diisocyanate) in a good proportion into a designated container;

[0071] S3, melting: Pour the mixed PTMEG (polytetrahydrofuran) and MDI (diisocyanate) into a melting tank, start the melting tank, adjust the temperature of the melting tank to 140°C, and fully stir PTMEG (polytetrahydrofuran) and MDI (diisocyanate) at the same time, set the speed of the stirring device at 1200r / min, then add the auxiliary materials, and then stir fully;

[0072] S4, extrusion: pour the melted raw materials into a screw extruder, set the temperature of the screw extruder to 140°C, and set the pre-reaction to 35 seconds, and use the screw extruder to extrude the melted raw materials through the mold;

[0073] S5, filamentation and winding: at the same time, the melt extruded from the formed raw materials through the spinneret holes is cooled and solidified into filaments by side blowing in the channel, and the blowing cooling temperature is set at 18° C. Finally, high-elastic spandex fiber filaments are obtained, and the high-elastic spandex fiber filaments are oiled and wound into a tube;

[0074] S6, weaving machine: then put the oiled and wound high-resilience spandex fiber yarn into the weaving machine, weave the high-resilience spandex fiber yarn into spandex yarn of normal thickness, and treat the outer part of the spandex yarn with core sand, which is also called elastic core-spun yarn. The main characteristics of this yarn are: good hand feel and appearance, natural fiber, good hygroscopicity; using 10% spandex filament, high-quality stretch yarn can be produced; the elastic range is controlled at 20%, and different elasticity values ​​are selected according to different product uses. The obtained high-resilience spandex fiber is prepared into common specifications of 15D / root. In theory, the fewer the roots, the better the uniformity of the yarn, because the chance of overlapping forms is less;

[0075] S7. Testing: The spandex yarn obtained is tested by performance testing equipment to obtain qualified spandex yarn. The spandex yarn performance testing items include tensile strength, elongation at break, residual elongation, modulus, aging resistance, dyeability, minimum fineness and thermal stability.

[0076] Embodiment 3

[0077] A method for preparing high-resilience spandex fiber comprises the following steps:

[0078] S1. Ingredients: PTMEG (polytetrahydrofuran) and MDI (diisocyanate) are mixed in a specified ratio, and auxiliary materials and additives are weighed at the same time. The mass percentage of PTMEG (polytetrahydrofuran) and MDI (diisocyanate) is 66%:12%, and the auxiliary materials are 17%. The auxiliary materials include one or more mixtures of ethylenediamine, butanediamine, ethanolamine and antioxidants;

[0079] S2. Mixing: Pour the PTMEG (polytetramethylene furan) and MDI (diisocyanate) in a good proportion into a designated container;

[0080] S3, melting: Pour the mixed PTMEG (polytetrahydrofuran) and MDI (diisocyanate) into a melting tank, start the melting tank, adjust the temperature of the melting tank to 140°C, and fully stir PTMEG (polytetrahydrofuran) and MDI (diisocyanate) at the same time, set the speed of the stirring device at 1200r / min, then add the auxiliary materials, and then stir fully;

[0081] S4, extrusion: pour the melted raw materials into a screw extruder, set the temperature of the screw extruder to 140°C, and set the pre-reaction to 35 seconds, and use the screw extruder to extrude the melted raw materials through the mold;

[0082] S5, filamentation and winding: at the same time, the melt extruded from the formed raw materials through the spinneret holes is cooled and solidified into filaments by side blowing in the channel, and the blowing cooling temperature is set at 18° C. Finally, high-elastic spandex fiber filaments are obtained, and the high-elastic spandex fiber filaments are oiled and wound into a tube;

[0083] S6, weaving machine: then put the oiled and wound high-resilience spandex fiber yarn into the weaving machine, weave the high-resilience spandex fiber yarn into spandex yarn of normal thickness, and treat the outer part of the spandex yarn with core sand, which is also called elastic core-spun yarn. The main characteristics of this yarn are: good hand feel and appearance, natural fiber, good hygroscopicity; using 10% spandex filament, high-quality stretch yarn can be produced; the elastic range is controlled at 20%, and different elasticity values ​​are selected according to different product uses. The obtained high-resilience spandex fiber is prepared into common specifications of 15D / root. In theory, the fewer the roots, the better the uniformity of the yarn, because the chance of overlapping forms is less;

[0084] S7. Testing: The spandex yarn obtained is tested by performance testing equipment to obtain qualified spandex yarn. The spandex yarn performance testing items include tensile strength, elongation at break, residual elongation, modulus, aging resistance, dyeability, minimum fineness and thermal stability.

[0085] According to the above examples, experimental comparison was carried out, only the ratio of PTMEG (polytetrahydrofuran) and MDI (diisocyanate) was changed, and other variables were kept the same. The following are the test data obtained in Example 1, Example 2 and Example 3:

[0086] index Embodiment 1 Embodiment 2 Embodiment 3 Existing spandex fiber Tensile strength / (cN / dtex) 1.1 1.3 1.2 0.9 Elongation at break / % 600 800 700 500 Residual elongation / % 17 20 19 15 Modulus / (cN / dtex) 0.03 0.05 0.04 0.02 Aging resistance good very good good Relatively poor Dyeability Can Can Can Relatively poor Minimum fineness 15 10 12 50 Thermal stability good Relatively poor good Relatively poor

[0087] From the table data, it can be concluded that among the first, second and third embodiments, the high resilience spandex fiber obtained in the second embodiment has the best performance.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A high resilience spandex fiber, characterized in that: The main raw materials of the high-resilience spandex fiber are: PTMEG (polytetramethylene furan) and MDI (diisocyanate) polymerized. PTMEG (polytetramethylene furan) is used to produce polyurethane elastomers, spandex and ester-ether copolymer elastomers. MDI (diisocyanate) is a polyurethane material synthesized from isocyanate, polyol and its auxiliary agents. During the spinning process of the high-resilience spandex fiber, the spandex is composed of one or more filaments. The mass percentage of the high-resilience spandex fiber is: PTMEG (polytetrahydrofuran) 60-66%; MDI (diisocyanate) 10-12%; Excipients 14-17%; Additives 9-11%; Additives include the following reagents: Antimicrobial agents Anti-aging agents Lubricants Crosslinking agent Curing agent.

2. The high resilience spandex fiber according to claim 1, characterized in that: The spandex has high elasticity and good resilience, which is determined by its high molecular block copolymer structure, in which the soft segment is composed of low molecular weight polyester or polyether chains.

3. A method for preparing high resilience spandex fiber according to any one of claims 1-2, characterized in that: The following steps are involved: S1. Ingredients: PTMEG (polytetrahydrofuran) and MDI (diisocyanate) are mixed in a specified ratio, with the mass percentage of PTMEG (polytetrahydrofuran) and MDI (diisocyanate) being 60-66%:10-12%, and auxiliary materials and additives are weighed at the same time; S2. Mixing: Pour the mixed PTMEG (polytetramethylene furan) and MDI (diisocyanate) into a designated container; S3, melting: Pour the mixed PTMEG (polytetrahydrofuran) and MDI (diisocyanate) into a melting tank, start the melting tank, adjust the temperature of the melting tank to 120-140°C, and fully stir PTMEG (polytetrahydrofuran) and MDI (diisocyanate) at the same time, set the speed of the stirring equipment at 800-1200r / min, then add the auxiliary materials, and then stir fully; S4, extrusion: pour the melted raw materials into a screw extruder, set the temperature of the screw extruder to 130-140°C, and set the pre-reaction to 20-35 seconds, and use the screw extruder to extrude the melted raw materials through the mold; S5, filament formation and winding: at the same time, the melt extruded from the formed raw materials through the small holes of the spinneret is cooled and solidified into filaments by side blowing in the channel, and finally high-elastic spandex fiber filaments are obtained, and the high-elastic spandex fiber filaments are oiled and wound into a tube; S6, weaving machine: then, the oiled and wound high-resilience spandex fiber yarn is put into the weaving machine, the high-resilience spandex fiber yarn is spun into spandex yarn of normal thickness, and the outer part of the spandex yarn is subjected to core-sand treatment; S7. Testing: The obtained spandex yarn is tested by performance testing equipment to obtain qualified spandex yarn.

4. The method for preparing high resilience spandex fiber according to claim 3, characterized in that: In S3, the temperature of the melting tank is adjusted to 120-140° C., and the rotation speed of the stirring device is set at 800-1200 r / min.

5. The method for preparing high resilience spandex fiber according to claim 3, characterized in that: In the S4, the temperature of the screw extruder is set to 130-140°C, the pre-reaction is set to 20-35 seconds, and in the S5, the temperature of the air-blowing cooling is set to 15-18°C.

6. The method for preparing high resilience spandex fiber according to claim 3, characterized in that: In the S6, the core-spun yarn is also called elastic core-spun yarn. The main characteristics of this yarn are: good hand feel and appearance, natural fiber, and good moisture absorption; 1-10% spandex filaments can be used to produce high-quality elastic yarn; the elasticity range is controlled at 10%-20%, and different elasticity values ​​are selected according to different product uses.

7. The method for preparing high resilience spandex fiber according to claim 3, characterized in that: In S7, the items of spandex yarn performance testing include tensile strength, elongation at break, residual elongation, modulus, aging resistance, dyeability, minimum fineness and thermal stability.

8. The method for preparing high resilience spandex fiber according to claim 3, characterized in that: In S1, the auxiliary materials include one or more mixtures of ethylenediamine, butanediamine, ethanolamine and antioxidants.

9. The method for preparing high resilience spandex fiber according to claim 3, characterized in that: In S6, the high resilience spandex fibers are prepared into common specifications of 10D / fiber, 15D / fiber and even 20D / fiber. An application of high-resilience spandex fiber, comprising the high-resilience spandex fiber prepared by any one of the preparation methods of claims 1 to 9, characterized in that: The high-resilience spandex fiber is widely used in sportswear, underwear, swimsuits, socks, pants and other clothing. The spandex fiber can also be blended with other fibers, such as cotton, wool, silk, etc., to increase the elasticity and comfort of the fabric.

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