Functional spandex fabric

Abstract

The invention relates to the technical field of fabric weaving, and discloses a functional spandex fabric which is formed by weaving spandex fibers on a machine after twisting, twist setting, warping and drafting. Wherein the spandex fiber is prepared by fully mixing a high-barrier polyvinyl alcohol modified polyurethane emulsion and a functional compound to form a spinning solution and then carrying out wet spinning; the high-barrier polyurethane emulsion is a polyurethane emulsion with organic fluorine in the structure; the functional compound is a compound with hindered amine groups and cinnamyl Schiff base in the structure. The high-barrier polyvinyl alcohol is prepared to enhance the hydrophobic antifouling performance of the spandex fabric, so that the fabric is not prone to being contaminated by oil stains, the purpose of easy cleaning is achieved, the light fastness and antibacterial performance of the fabric are improved by preparing the functional compound, the fabric is prevented from yellowing due to long-time illumination and physiological activities of bacteria, and the fabric has a good anti-fouling effect. The service life of the fabric is greatly prolonged.

Description

Technical Field

[0001] This invention relates to the field of fabric weaving technology, specifically to a functional spandex fabric. Background Technology

[0002] Spandex fabric is an important component of the clothing and textile industry. It is made by intertwining spandex fibers. The spandex structure contains a large number of urethane groups, which gives the fibers excellent elasticity, making the woven spandex fabric soft and comfortable, conforming to the human body's contours, and adapting to the needs of various clothing and textiles, with a wide range of applications. However, spandex fabric has poor light resistance and is easily affected by ultraviolet rays during use. Under sunlight or ultraviolet light, molecular oxidation and cracking occur, causing the fabric surface to yellow, affecting the appearance and performance of the spandex fabric. At the same time, because spandex fabric itself does not have a stain-resistant barrier function, it is easy to get oil stains in actual use. It is very difficult to clean and can easily leave oil residue, affecting the appearance of clothing. Long-term accumulation of oil stains and the growth of bacteria in hot and humid environments can affect human health. During the growth and reproduction of bacteria, they also secrete some acidic substances. These acidic substances cause the pH value of the fabric to drop, which promotes the formation and deposition of some colored substances, causing the fabric to yellow and reducing its lifespan.

[0003] Therefore, people often modify spandex fabrics when using them. For example, patent CN111155313B discloses a modified spandex fiber material and its preparation method. By grafting a polyamino compound onto pretreated spandex fibers, adsorbing metal ions onto the surface of the spandex fibers, adding sulfur ions for reaction, and finally grafting with a fluorosilicone reagent, a modified spandex fiber material is obtained. Fabrics woven from this spandex fiber have excellent stain resistance and UV resistance, which can improve the lightfastness of spandex fabrics and prevent spandex fabrics from aging and yellowing due to light exposure. However, this fabric does not take into account the impact of the physiological activities of bacterial growth and reproduction on the fabric, and does not improve the antibacterial properties of the fabric. Summary of the Invention

[0004] The purpose of this invention is to provide a functional spandex fabric that solves the following technical problems: (1) the fabric is prone to getting stained with oil due to insufficient stain resistance, making it difficult to clean and affecting the appearance of the clothes; (2) the fabric has no antibacterial properties and is prone to bacterial growth in humid and hot environments, affecting human health; (3) the fabric has insufficient light resistance and yellowing due to light exposure.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A functional spandex fabric is woven from spandex fibers through twisting, warping, and heddle threading. The spandex fibers are formed by fully mixing a high-barrier polyvinyl alcohol-modified polyurethane emulsion with a functional compound to form a spinning solution, which is then wet-spun. The high-barrier polyurethane emulsion is a polyurethane emulsion containing organic fluorine in its structure. The functional compound is a compound containing hindered amine groups and cinnamaldehyde Schiff bases in its structure.

[0007] Furthermore, the preparation method of the high-barrier polyvinyl alcohol is as follows:

[0008] S1: Place polyvinyl alcohol in deionized water, add epichlorohydrin and tetrabutylammonium bromide, heat to 70-85℃ and react for 3-5 hours, then adjust the pH to 11-12 with sodium hydroxide solution, heat to 60-70℃ and react for 1-3 hours, filter, wash and vacuum dry to obtain modified polyvinyl alcohol.

[0009] S2: Place the modified polyvinyl alcohol in deionized water, add 1H,1H,2H,2H-perfluorodecylthiol and catalyst, heat to 70-85℃, react for 15-20h, collect the product, and obtain high-barrier polyvinyl alcohol.

[0010] In this method, under the action of tetrabutylammonium bromide and alkaline conditions, epichlorohydrin undergoes a polycondensation reaction with the hydroxyl groups in the polyvinyl alcohol structure to obtain modified polyvinyl alcohol. Then, under the action of a catalyst, the epoxy groups in the modified polyvinyl alcohol structure react with the mercapto groups in the 1H,1H,2H,2H-perfluorodecylthiol structure to obtain high-barrier polyvinyl alcohol. This high-barrier polyvinyl alcohol structure has multiple hydroxyl groups that can undergo cross-linking reactions with spandex fiber spinning solutions, enhancing the mechanical properties of spandex fibers. It also enhances the softness and comfort of the fabric. The short bond spacing and high bond energy of the CF bonds in its structure result in extremely low surface energy, which enhances the fabric's hydrophobic and stain-resistant properties, making it less prone to oil stains, easy to clean, and significantly extending the fabric's service life.

[0011] Further, in step S1, the mass fraction of the sodium hydroxide solution is 10-20%.

[0012] Furthermore, in step S2, the catalyst is triethylamine.

[0013] Furthermore, the preparation method of the functional complex is as follows:

[0014] SS1: 2-Methyl-2-acrylate-2,2,6,6-tetramethyl-4-piperidinyl ester and 2-aminoethyl methacrylate hydrochloride were placed in N,N-dimethylformamide, an initiator was added, the temperature was raised to 55-65℃ and the reaction was carried out for 5-8 hours. The functional complex precursor was obtained by vacuum distillation.

[0015] SS2: Cinnamaldehyde was placed in acetone, a functional complex precursor was added, the mixture was heated to react, and after the reaction was completed, it was filtered, washed, and dried to obtain the functional complex.

[0016] In this method, under the action of an initiator, 2-methyl-2-acrylate-2,2,6,6-tetramethyl-4-piperidinyl ester and 2-aminoethyl methacrylate hydrochloride undergo a free radical polymerization reaction to obtain a functional complex precursor containing amino groups. The amino groups in the structure of this functional complex precursor react with the aldehyde groups in the cinnamaldehyde structure to form a Schiff base, yielding the functional complex. This functional complex contains hindered amine groups that can absorb ultraviolet light, improving the lightfastness of the fabric and preventing yellowing caused by light exposure. Simultaneously, its structure also contains a cinnamaldehyde Schiff base, which can exert a broad-spectrum bactericidal effect, preventing bacterial growth that could affect human health, and preventing the production of acidic substances during bacterial growth and metabolism that could contaminate the fabric, causing yellowing and affecting the appearance of clothing, thereby extending the fabric's lifespan.

[0017] Furthermore, in step S1, the initiator is either ammonium persulfate or potassium persulfate.

[0018] Furthermore, in step S2, the heating reaction temperature is 40-50℃ and the time is 10-15h.

[0019] Furthermore, the method for preparing the spandex fabric is as follows:

[0020] Step 1: Thoroughly mix isophorone diisocyanate and polyethylene glycol-2000, purge with nitrogen, heat to 70-75℃, add dibutyltin dilaurate, keep the reaction at this temperature for 1-2 hours, then cool to 55-60℃, add 1,4-butanediol, continue heating to 70-75℃ and react for 3-5 hours, cool to 45-50℃, add high-barrier polyvinyl alcohol and triethylamine, stir evenly, keep the reaction at this temperature for 2-5 hours, add deionized water, continue stirring for 1-2 hours, and let stand to defoam to obtain polyurethane emulsion;

[0021] Step 2: Place the functional compound and polyurethane emulsion in N,N-dimethylacetamide, stir thoroughly, and mix evenly to form a spinning solution. Set the spinning solution flow rate and perform wet spinning. After the spinning solution passes through the spinneret, add it to a distilled water coagulation bath, and then perform stretching, drying, and winding to obtain spandex fibers.

[0022] Step 3: After twisting, fixing, warping, and threading the heddles, the spandex fibers are woven on a loom to obtain spandex fabric.

[0023] Furthermore, in step two, the flow rate of the spinning solution is 0.6-0.8 ml / h.

[0024] The beneficial effects of this invention are:

[0025] This invention enhances the hydrophobic and stain-resistant properties of spandex fabrics by preparing high-barrier polyvinyl alcohol, making the fabric easy to clean and resistant to oil stains. Furthermore, it improves the fabric's lightfastness and antibacterial properties by preparing functional composites, preventing yellowing caused by prolonged exposure to light and bacterial physiological activities, thus extending the fabric's lifespan.

[0026] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is the infrared spectrum of the functional compound in Example 1 of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] The preparation method of high-barrier polyvinyl alcohol is as follows:

[0032] S1: Place 2g of polyvinyl alcohol in 50ml of deionized water, add 2.5ml of epichlorohydrin and 0.05g of tetrabutylammonium bromide, heat to 70℃ and react for 3h, then adjust the pH to 11 with 10% sodium hydroxide aqueous solution, heat to 60℃ and react for 1h, filter, wash and vacuum dry to obtain modified polyvinyl alcohol.

[0033] S2: Place 2.5g of modified polyvinyl alcohol in 80ml of deionized water, add 1.5g of 1H,1H,2H,2H-perfluorodecyl mercaptan and 0.02ml of triethylamine, heat to 70℃, react for 15h, cool to room temperature and collect the product to obtain high-barrier polyvinyl alcohol.

[0034] The sulfur content in modified polyvinyl alcohol and high-barrier polyvinyl alcohol was determined using a Flash Smart elemental analyzer. The results showed that modified polyvinyl alcohol did not contain sulfur, while the sulfur content in high-barrier polyvinyl alcohol was 3.2%. This is attributed to the ring-opening reaction between the epoxy groups on the surface of modified polyvinyl alcohol and the thiol groups in the 1H,1H,2H,2H-perfluorodecyl mercaptan structure.

[0035] Preparation of functional complexes

[0036] SS1: 3g of 2-methyl-2-acrylate-2,2,6,6-tetramethyl-4-piperidinyl ester and 2g of 2-aminoethyl methacrylate hydrochloride were placed in 100ml of N,N-dimethylformamide, thoroughly mixed, and then 0.2g of ammonium persulfate was added. The mixture was heated to 55℃ and reacted for 5h. The precursor of the functional complex was obtained by vacuum distillation.

[0037] SS2: Place 2 ml of cinnamaldehyde in 30 ml of acetone, add 5 g of the functional complex precursor, heat to 40 °C and react for 10 h. After the reaction is complete, filter, wash and dry to obtain the functional complex.

[0038] The infrared absorption spectra of the functional complexes were determined using a Nicolet 6700 Fourier transform infrared spectrometer and the KBr pellet method. Figure 1 It can be seen that in the infrared spectrum of the functional complex, 3412 cm⁻¹ -1 The absorption peak at 3034 cm⁻¹ represents the nitrogen-hydrogen bond in the imine group. -1 The absorption peak at 2879 cm⁻¹ represents the carbon-hydrogen bond in the benzene ring. -1 The absorption peak at 1721 cm⁻¹ represents the carbon-hydrogen bond in the methyl group. -1 The absorption peak at 1630 cm⁻¹ represents the carbon-oxygen double bond in the ester group. -1 The absorption peak at 3034 cm⁻¹ represents the carbon-nitrogen bond in a carbon-nitrogen double bond. -1 The absorption peak of the carbon-hydrogen bond in the benzene ring and 1630 cm⁻¹ -1 The presence of the carbon-nitrogen bond absorption peak in the carbon-nitrogen double bond indicates that the amino group in the precursor structure of the functional complex underwent a Schiff base reaction with the aldehyde group in the cinnamaldehyde structure, resulting in the functional complex.

[0039] Preparation of spandex fabric

[0040] Step 1: Mix 3ml of isophorone diisocyanate with 5ml of polyethylene glycol-2000 thoroughly, purge with nitrogen, heat to 70℃, add 0.5g of dibutyltin dilaurate, keep the reaction at this temperature for 1 hour, then cool to 55℃, add 1.5ml of 1,4-butanediol, continue to heat to 70℃ and react for 3 hours, cool to 45℃, add 4g of high-barrier polyvinyl alcohol and 2ml of triethylamine, stir evenly, keep the reaction at this temperature for 2 hours, add 20ml of deionized water, continue stirring for 1 hour, and let stand to defoam to obtain polyurethane emulsion;

[0041] Step 2: Place 3g of functional compound and 25ml of polyurethane emulsion in 80ml of N,N-dimethylacetamide, stir thoroughly, and mix evenly to form a spinning solution. Set the spinning solution flow rate to 0.6ml / h for wet spinning. After the spinning solution passes through the spinneret, add it to a distilled water coagulation bath, and then perform stretching, drying, and winding to obtain spandex fiber.

[0042] Step 3: After twisting, fixing, warping, and threading the heddles, the spandex fibers are woven on a loom to obtain spandex fabric.

[0043] Example 2

[0044] Preparation of spandex fabric

[0045] Step 1: Mix 5ml of isophorone diisocyanate with 8ml of polyethylene glycol-2000 thoroughly, purge with nitrogen, heat to 72℃, add 0.6g of dibutyltin dilaurate, keep the reaction at this temperature for 1.5h, then cool to 57℃, add 2ml of 1,4-butanediol, continue heating to 72℃ and react for 4h, then cool to 47℃, add 4.5g of high-barrier polyvinyl alcohol and 2.5ml of triethylamine, stir evenly, keep the reaction at this temperature for 3h, then add 25ml of deionized water, continue stirring for 1.5h, and let stand to defoam to obtain polyurethane emulsion;

[0046] Step 2: Place 3.5g of functional compound and 30ml of polyurethane emulsion in 90ml of N,N-dimethylacetamide, stir thoroughly, and mix evenly to form a spinning solution. Set the spinning solution flow rate to 0.7ml / h for wet spinning. After the spinning solution passes through the spinneret, add it to a distilled water coagulation bath, and then stretch, dry, and wind to obtain spandex fiber.

[0047] Step 3: After twisting, fixing, warping, and threading the heddles, the spandex fibers are woven on a loom to obtain spandex fabric.

[0048] The preparation method of the high-barrier polyvinyl alcohol and functional compound is the same as that in Example 1.

[0049] Example 3

[0050] Preparation of spandex fabric

[0051] Step 1: Mix 6 ml of isophorone diisocyanate with 10 ml of polyethylene glycol-2000 thoroughly, purge with nitrogen, heat to 75°C, add 0.7 g of dibutyltin dilaurate, keep the reaction at this temperature for 2 hours, then cool to 60°C, add 3 ml of 1,4-butanediol, continue heating to 75°C and react for 5 hours, cool to 50°C, add 5 g of high-barrier polyvinyl alcohol and 3 ml of triethylamine, stir evenly, keep the reaction at this temperature for 5 hours, add 30 ml of deionized water, continue stirring for 2 hours, and let stand to defoam to obtain polyurethane emulsion;

[0052] Step 2: Place 4g of functional compound and 35ml of polyurethane emulsion in 100ml of N,N-dimethylacetamide, stir thoroughly, and mix evenly to form a spinning solution. Set the spinning solution flow rate to 0.8ml / h for wet spinning. After the spinning solution passes through the spinneret, add it to a distilled water coagulation bath, and then perform stretching, drying, and winding to obtain spandex fiber.

[0053] Step 3: After twisting, fixing, warping, and threading the heddles, the spandex fibers are woven on a loom to obtain spandex fabric.

[0054] The preparation method of the high-barrier polyvinyl alcohol and functional compound is the same as that in Example 1.

[0055] Comparative Example 1

[0056] Preparation of spandex fabric

[0057] Step 1: Mix 5ml of isophorone diisocyanate with 8ml of polyethylene glycol-2000 thoroughly, purge with nitrogen, heat to 72℃, add 0.6g of dibutyltin dilaurate, keep the reaction at this temperature for 1.5h, then cool to 57℃, add 2ml of 1,4-butanediol, continue heating to 72℃ and react for 4h, cool to 47℃, add 2.5ml of triethylamine, stir evenly, keep the reaction at this temperature for 3h, add 25ml of deionized water, continue stirring for 1.5h, and let stand to defoam to obtain polyurethane emulsion;

[0058] Step 2: Place 3.5g of functional compound and 30ml of polyurethane emulsion in 90ml of N,N-dimethylacetamide, stir thoroughly, and mix evenly to form a spinning solution. Set the spinning solution flow rate to 0.7ml / h for wet spinning. After the spinning solution passes through the spinneret, add it to a distilled water coagulation bath, and then stretch, dry, and wind to obtain spandex fiber.

[0059] Step 3: After twisting, fixing, warping, and threading the heddles, the spandex fibers are woven on a loom to obtain spandex fabric.

[0060] The preparation method of the functional compound is the same as that in Example 1.

[0061] Comparative Example 2

[0062] Preparation of spandex fabric

[0063] Step 1: Mix 5ml of isophorone diisocyanate with 8ml of polyethylene glycol-2000 thoroughly, purge with nitrogen, heat to 72℃, add 0.6g of dibutyltin dilaurate, keep the reaction at this temperature for 1.5h, then cool to 57℃, add 2ml of 1,4-butanediol, continue heating to 72℃ and react for 4h, then cool to 47℃, add 4.5g of high-barrier polyvinyl alcohol and 2.5ml of triethylamine, stir evenly, keep the reaction at this temperature for 3h, then add 25ml of deionized water, continue stirring for 1.5h, and let stand to defoam to obtain polyurethane emulsion;

[0064] Step 2: Place 30ml of polyurethane emulsion in 90ml of N,N-dimethylacetamide, stir thoroughly, and mix evenly to form a spinning solution. Set the spinning solution flow rate to 0.7ml / h for wet spinning. After the spinning solution passes through the spinneret, it is added to a distilled water coagulation bath. Then, after stretching, drying, and winding, spandex fiber is obtained.

[0065] Step 3: After twisting, fixing, warping, and threading the heddles, the spandex fibers are woven on a loom to obtain spandex fabric.

[0066] The preparation method of high-barrier polyvinyl alcohol is the same as that in Example 1.

[0067] Comparative Example 3

[0068] Preparation of spandex fabric

[0069] Step 1: Mix 5ml of isophorone diisocyanate with 8ml of polyethylene glycol-2000 thoroughly, purge with nitrogen, heat to 72℃, add 0.6g of dibutyltin dilaurate, keep the reaction at this temperature for 1.5h, then cool to 57℃, add 2ml of 1,4-butanediol, continue heating to 72℃ and react for 4h, cool to 47℃, add 2.5ml of triethylamine, stir evenly, keep the reaction at this temperature for 3h, add 25ml of deionized water, continue stirring for 1.5h, and let stand to defoam to obtain polyurethane emulsion;

[0070] Step 2: Place 30ml of polyurethane emulsion in 90ml of N,N-dimethylacetamide, stir thoroughly, and mix evenly to form a spinning solution. Set the spinning solution flow rate to 0.7ml / h for wet spinning. After the spinning solution passes through the spinneret, it is added to a distilled water coagulation bath. Then, after stretching, drying, and winding, spandex fiber is obtained.

[0071] Step 3: After twisting, fixing, warping, and threading the heddles, the spandex fibers are woven on a loom to obtain spandex fabric.

[0072] Comparative Example 4

[0073] Preparation of spandex fabric

[0074] Step 1: Mix 5ml of isophorone diisocyanate with 8ml of polyethylene glycol-2000 thoroughly, purge with nitrogen, heat to 72℃, add 0.6g of dibutyltin dilaurate, keep the reaction at this temperature for 1.5h, then cool to 57℃, add 2ml of 1,4-butanediol, continue heating to 72℃ and react for 4h, cool to 47℃, add 4.5g of polyvinyl alcohol and 2.5ml of triethylamine, stir evenly, keep the reaction at this temperature for 3h, add 25ml of deionized water, continue stirring for 1.5h, and let stand to defoam to obtain polyurethane emulsion;

[0075] Step 2: Place 3.5g of functional compound and 30ml of polyurethane emulsion in 90ml of N,N-dimethylacetamide, stir thoroughly, and mix evenly to form a spinning solution. Set the spinning solution flow rate to 0.7ml / h for wet spinning. After the spinning solution passes through the spinneret, add it to a distilled water coagulation bath, and then stretch, dry, and wind to obtain spandex fiber.

[0076] Step 3: After twisting, fixing, warping, and threading the heddles, the spandex fibers are woven on a loom to obtain spandex fabric.

[0077] The preparation method of the functional compound is the same as that in Example 1.

[0078] Performance testing

[0079] The spandex fabrics prepared in Examples 1-3 and Comparative Examples 1-4 were cut into samples conforming to specifications. The samples were tested for light yellowing resistance according to standard GB / T30669-2014 "Textiles - Tests for Color Fastness - Light Yellowing Fastness". Water contact angle tests were performed using a JC2000D2G contact angle tester. Antimicrobial properties were tested according to standard GB / T20944.3-2008 "Evaluation of Antimicrobial Properties of Textiles - Part 3: Shaking Method", with Staphylococcus aureus as the tested bacteria. Tensile strength was tested according to standard GB / T3923.2-2013 "Textiles - Tensile Properties of Fabrics - Part 2: Determination of Breaking Strength (Grasp Method)" to determine the mechanical properties of the samples. Specific testing methods are shown in the table below.

[0080]

[0081]

[0082] As shown in the table above, the samples prepared in Examples 1-3 all exhibited excellent performance in terms of anti-yellowing, barrier and antifouling properties, as well as good mechanical properties. The sample prepared in Comparative Example 1 did not use high-barrier polyvinyl alcohol, resulting in poor antifouling performance. However, due to the addition of a functional compound, it possessed excellent antibacterial properties, good yellowing resistance, and good mechanical properties. The sample prepared in Comparative Example 2 did not contain a functional compound, resulting in average yellowing resistance and poor antibacterial performance. However, due to the addition of high-barrier polyvinyl alcohol, it exhibited excellent antifouling performance and good mechanical properties. The sample prepared in Comparative Example 3 did not contain either high-barrier polyvinyl alcohol or a functional compound, resulting in poor performance in terms of yellowing resistance, antifouling, antibacterial properties, and mechanical properties. The sample prepared in Comparative Example 4 contained a functional compound, resulting in superior antibacterial and yellowing resistance. The direct addition of unmodified polyvinyl alcohol improved the mechanical properties of the sample, but its antifouling performance was generally ineffective in blocking bacteria.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. A functional spandex fabric, characterized by, The functional spandex fabric is formed by twisting, setting, warping, and weaving spandex fibers after being threaded; the spandex fibers are formed by mixing high-barrier polyvinyl alcohol modified polyurethane emulsion and functional complex to form spinning solution, and then wet spinning; the high-barrier polyurethane emulsion is polyurethane emulsion with organic fluorine structure; the functional complex is a complex with hindered amine groups and cinnamaldehyde-based Schiff base.

2. The functional spandex fabric according to claim 1, wherein, The preparation method of the high-barrier polyvinyl alcohol is: S1: Put polyvinyl alcohol into deionized water, add epichlorohydrin and tetrabutylammonium bromide, heat to 70-85℃ and react for 3-5h, then adjust pH to 11-12 with sodium hydroxide solution, heat to 60-70℃ and react for 1-3h, filter, wash, and vacuum dry to obtain modified polyvinyl alcohol; S2: Put the modified polyvinyl alcohol into deionized water, add 1H, 1H, 2H, 2H-perfluorodecanethiol and a catalyst, heat to 70-85℃ and react for 15-20h, collect the product to obtain high-barrier polyvinyl alcohol.

3. The functional spandex fabric according to claim 2, wherein, In step S1, the mass fraction of the sodium hydroxide solution is 10-20%.

4. The functional spandex fabric according to claim 2, wherein, In step S2, the catalyst is triethylamine.

5. The functional spandex fabric according to claim 1, wherein, The preparation method of the functional complex is: SS1: Put 2-methyl-2-propenoic acid-2,2,6,6-tetramethyl-4-piperidyl ester and 2-aminoethyl methacrylate hydrochloride into N,N-dimethylformamide, add an initiator, heat to 55-65℃ and react for 5-8h, and then distill under reduced pressure to obtain a functional complex precursor; SS2: Put cinnamaldehyde into acetone, add the functional complex precursor, heat to react, and then filter, wash, and dry to obtain the functional complex.

6. The functional spandex fabric according to claim 5, wherein, In step S1, the initiator is any one of ammonium persulfate and potassium persulfate.

7. The functional spandex fabric of claim 5, wherein, In step S2, the heating reaction temperature is 40-50℃, and the time is 10-15h.

8. The functional spandex fabric of claim 1, wherein, The preparation method of the spandex fabric is: Step one, mix isophorone diisocyanate and polyethylene glycol-2000, introduce nitrogen, heat to 70-75℃, add dibutyltin dilaurate, heat to react for 1-2h, then cool to 55-60℃, add 1,4-butanediol, continue to heat to 70-75℃ and react for 3-5h, cool to 45-50℃, add high-barrier polyvinyl alcohol and triethylamine, stir uniformly, heat to react for 2-5h, then add deionized water, continue to stir for 1-2h, and then stand to defoam to obtain polyurethane emulsion; Step two, put the functional complex and the polyurethane emulsion into N,N-dimethylacetamide, stir thoroughly, mix uniformly to form spinning solution, set the spinning solution flow rate, and perform wet spinning, the spinning solution is added to a distillation water coagulation bath after passing through a spinneret, and then is drawn, dried, and wound to obtain spandex fibers; Step three, the spandex fibers are twisted, set, warped, threaded, and then woven to obtain the spandex fabric.

9. The functional spandex fabric according to claim 8, wherein, In step two, the spinning solution flow rate is 0.6-0.8ml / h.

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