A flame-retardant spandex fabric and its preparation method

Abstract

The present invention relates to the technical field of spandex fabrics, and particularly relates to a flame-retardant spandex fabric and a preparation method thereof, including a spandex matrix layer. Inner layers are fixedly arranged on both the upper surface and the lower surface of the spandex matrix layer, and an improved layer is fixedly arranged on the outer surface of the inner layer away from the spandex matrix layer. The spandex matrix layer is woven from elastic fibers, and the elastic fibers include spandex fiber threads. The flame-retardant spandex fabric of the present invention is made of a spandex matrix layer in cooperation with an inner layer and an improved layer. The spandex matrix layer is spirally wound with glass fiber threads and hemp fiber threads on the outer wall of the spandex fiber threads to optimize the elastic performance of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of spandex fabrics, and particularly relates to a flame-retardant spandex fabric and a preparation method thereof. Background Art

[0002] A composite fabric is a new type of material formed by bonding and laminating one or more layers of textile materials, non-woven materials, and other functional materials, and is suitable for making textiles such as sofas and clothing, and is one of the indispensable fabrics for people's home life.

[0003] The existing spandex fabrics have poor flame retardancy, as well as poor wear resistance and elastic properties. It is difficult to coordinately and balancedly improve the flame retardancy, wear resistance, and elasticity of the products, and the weather and wash fastness stability of the products is poor, which limits the use efficiency of the products. Summary of the Invention

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a flame-retardant spandex fabric and a preparation method thereof to solve the problems raised in the above background art.

[0005] The present invention adopts the following technical solutions to solve the technical problems:

[0006] The present invention provides a flame-retardant spandex fabric, including a spandex matrix layer. Inner layers are fixedly provided on both the upper surface and the lower surface of the spandex matrix layer, and an improved layer is fixedly provided on the outer surface of the inner layer away from the spandex matrix layer;

[0007] The spandex matrix layer is woven from elastic fibers. The elastic fibers include spandex fiber threads, and fiberglass threads and hemp fiber threads are arranged outside the spandex fiber threads, and the fiberglass threads and the hemp fiber threads are spirally wound on the outer wall of the spandex fiber threads;

[0008] The inner layer is formed by interweaving and knitting flax fiber filaments and aramid fiber yarns;

[0009] The improved layer is formed by spraying a nano-modified coating agent onto the outer surface of the inner layer. The thickness of the improved layer is 0.2 - 0.3 mm; the thickness of the spandex matrix layer is 0.4 - 0.5 mm; the thickness of the inner layer is 0.3 - 0.4 mm;

[0010] Among them, the nano-modified coating agent includes the following raw materials in parts by weight:

[0011] 45 - 50 parts of polyurethane resin, 20 - 25 parts of epoxy resin, 7 - 11 parts of modified nano filler, 5 - 9 parts of synergistic filler, 5 - 8 parts of flame retardant, 3 - 5 parts of thickener, 2 - 4 parts of silane coupling agent, 4 - 6 parts of curing agent, and 30 - 35 parts of solvent.

[0012] Preferably, the solvent is acetone solvent; the silane coupling agent is silane coupling agent KH560; the flame retardant is magnesium hydroxide; the thickener is methyl cellulose;

[0013] The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

[0014] Preferably, the preparation method of the modified nanofiller is:

[0015] S01: stirring the carbon nanotubes thoroughly in a sufficient amount of potassium permanganate solution, then washing, filtering, and drying to obtain dry carbon nanotubes;

[0016] 3-5 parts of calcium titanate and 2-3 parts of silicon carbide are added by weight to 5-8 parts of a 4% by weight lanthanum chloride solution, followed by adding 1-2 parts of a silane coupling agent KH550 and stirring thoroughly to obtain a calcium titanate solution;

[0017] S02: stirring and modifying the dried carbon nanotubes and calcium titanate solution in a weight ratio of 3:5, and completing the stirring to obtain a carbon nanotube-calcium titanate combined solution;

[0018] S03: Preparation of nano-modifier:

[0019] Carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution were uniformly mixed in a weight ratio of 3:1:2 to obtain a carboxymethyl cellulose solution;

[0020] Add 3-5 parts of nano-bentonite and 2-3 parts of nano-zirconia by weight to 5-7 parts of carboxymethyl cellulose solution, perform ultrasonic treatment, and then filter and dry to obtain a nano-modifier;

[0021] S04: The carbon nanotube-calcium titanate combined solution and the nano-modifier are mixed in a weight ratio of 3:5 and ball-milled at a ball-milling speed of 1500 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain a nano-filler.

[0022] Preferably, the mass fraction of the potassium permanganate solution is 5-8%; the mass fraction of the urea solution is 2-5%.

[0023] Preferably, the stirring speed of the stirring modification treatment is 750-800 r / min, and the stirring is 1-2 hours; the ultrasonic power of the ultrasonic treatment is 350-400 W, and the ultrasonic treatment is 20-30 minutes.

[0024] Preferably, the preparation method of the synergistic filler is:

[0025] S11: preparing a 5% by weight sodium dodecylbenzene sulfonate solution, preheating magnesium titanate at 55-60° C. for 1 hour, and uniformly stirring the preheated magnesium titanate in the sodium dodecylbenzene sulfonate solution having a weight that is 3-5 times the total weight of the magnesium titanate to obtain a magnesium titanate solution;

[0026] S12: Mix the magnesium titanate solution and the filling agent in a weight ratio of 7:5, perform ball milling treatment, and after the ball milling is completed, carry out suction filtration and drying to obtain the filling agent for matching effect.

[0027] Preferably, the ball milling speed for the mixing and ball milling treatment is 1000 - 1200 r / min, and ball milling is carried out for 2 h.

[0028] Preferably, the preparation method of the filling agent for matching effect is as follows:

[0029] Stir titanium oxide and dopamine hydrochloride solution evenly in a weight ratio of 2:5 to obtain a titanium oxide solution;

[0030] Subsequently, add 3 - 5 parts by weight of barium carbonate and 1 - 3 parts by weight of hydrotalcite to 4 - 7 parts by weight of the titanium oxide solution, and finally add 1 - 2 parts by weight of sodium stearate, stir evenly, then carry out suction filtration and drying to obtain the filling agent for matching effect.

[0031] Preferably, the mass fraction of the dopamine hydrochloride solution is 3 - 6%.

[0032] The present invention also provides a preparation method of a flame - retardant spandex fabric, comprising the following steps:

[0033] Step 1: First, wind glass fiber yarns and hemp fiber yarns spirally on the outer wall of spandex fiber yarns to form a spandex matrix layer;

[0034] Step 2: Then, interweave and braid flax fiber filaments and aramid fiber yarns to form an inner layer, and the inner layer is compounded with the upper and lower surfaces of the spandex matrix layer through polyurethane glue, and the dosage of the polyurethane glue is 20 g / m 2 ;

[0035] Step 3: Then, weigh the raw materials of the nano - modified coating agent according to parts by weight, and then mix the raw materials evenly to obtain the nano - modified coating agent. Spray the nano - modified coating agent on the outer surface of the inner layer to form an improved layer, and thus the flame - retardant spandex fabric can be obtained.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The flame-retardant spandex fabric of the present invention is made of a spandex matrix layer in cooperation with an inner layer and an improved layer. The spandex matrix layer is formed by helically winding glass fiber yarns and hemp fiber yarns on the outer wall of spandex fiber yarns to optimize the elastic properties of the product. At the same time, in cooperation with the improved layer, it is formed by spraying a nano-modified coating agent on the outer surface of the inner layer. The nano-modified coating agent is made of polyurethane resin, epoxy resin in combination with a flame retardant, a thickening agent, a silane coupling agent, a curing agent, a solvent and other raw materials. Through the blending of the raw materials, and at the same time adding a modified nano-filler and a synergistic filler, the synergistic effect of the raw materials is adopted to optimize the flame retardancy, wear resistance and elastic coordination balance improvement of the product, and the weather resistance-wash resistance stability effect of the product is remarkable; the modified nano-filler is optimized and improved by carbon nanotubes through a potassium permanganate solution, and then stirred and improved with a calcium titanate solution. Calcium titanate, silicon carbide in the calcium titanate solution and a lanthanum chloride solution with a mass fraction of 4% are combined with a silane coupling agent KH550. Through the co-allocation and co-assistance of the raw materials, a carbon nanotube-calcium titanate combined solution is prepared. At the same time, it is further improved by ball milling with a nano-modifying agent. The nano-bentonite, nano-zirconia and carboxymethyl cellulose solution in the nano-modifying agent are jointly blended and optimized. At the same time, the carboxymethyl cellulose, urea solution and a nitric acid yttrium solution with a mass fraction of 4% in the carboxymethyl cellulose solution are co-blended. Thus, the prepared modified nano-filler optimizes the performance coordination and performance stability of the product in the system; the synergistic filler is preheated magnesium titanate and dispersed and blended into a sodium dodecylbenzenesulfonate solution for improvement. At the same time, it is further improved by ball milling with a filling effect agent. Barium carbonate and hydrotalcite in the filling effect agent are combined with a titanium oxide solution, and finally sodium stearate is blended. Through the co-blending and co-allocation of the raw materials, the synergistic effect is optimized. The prepared synergistic filler has a better synergistic effect with the modified nano-filler, and further improves the performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the layered structure of the present invention;

[0039] Figure 2 It is a schematic diagram of the structure of the spandex matrix layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] A flame-retardant spandex fabric in this embodiment includes a spandex matrix layer 1. Inner layers 2 are fixedly arranged on both the upper surface and the lower surface of the spandex matrix layer 1. An improved layer 3 is fixedly arranged on the outer surface of the inner layer 2 away from the spandex matrix layer 1;

[0042] The spandex base layer 1 is woven with elastic fibers, and the elastic fibers include spandex fiber lines 101. Glass fiber lines 102 and hemp fiber lines 103 are arranged outside the spandex fiber lines 101. The glass fiber lines 102 and hemp fiber lines 103 are spirally wound around the outer wall of the spandex fiber lines 101.

[0043] The inner layer 2 is formed by interweaving flax fiber yarn and aramid fiber yarn;

[0044] The improved layer 3 is formed by spraying a nano-modified coating onto the outer surface of the inner layer 2. The thickness of the improved layer 3 is 0.2-0.3 mm. The thickness of the spandex base layer 1 is 0.4-0.5 mm. The thickness of the inner layer 2 is 0.3-0.4 mm.

[0045] The nano-modified coating comprises the following raw materials in parts by weight:

[0046] 45-50 parts of polyurethane resin, 20-25 parts of epoxy resin, 7-11 parts of modified nanofiller, 5-9 parts of matching filler, 5-8 parts of flame retardant, 3-5 parts of thickener, 2-4 parts of silane coupling agent, 4-6 parts of curing agent and 30-35 parts of solvent.

[0047] The solvent of this embodiment is acetone solvent; the silane coupling agent is silane coupling agent KH560; the flame retardant is magnesium hydroxide; the thickener is methyl cellulose;

[0048] The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

[0049] The preparation method of the modified nanofiller of this embodiment is:

[0050] S01: stirring the carbon nanotubes thoroughly in a sufficient amount of potassium permanganate solution, then washing, filtering, and drying to obtain dry carbon nanotubes;

[0051] 3-5 parts of calcium titanate and 2-3 parts of silicon carbide are added by weight to 5-8 parts of a 4% by weight lanthanum chloride solution, followed by adding 1-2 parts of a silane coupling agent KH550 and stirring thoroughly to obtain a calcium titanate solution;

[0052] S02: stirring and modifying the dried carbon nanotubes and calcium titanate solution in a weight ratio of 3:5, and completing the stirring to obtain a carbon nanotube-calcium titanate combined solution;

[0053] S03: Preparation of nano-modifier:

[0054] Carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution were uniformly mixed in a weight ratio of 3:1:2 to obtain a carboxymethyl cellulose solution;

[0055] Add 3 - 5 parts of nano - bentonite and 2 - 3 parts of nano - zirconia by weight to 5 - 7 parts of carboxymethyl cellulose solution, conduct ultrasonic treatment, then perform suction filtration and drying to obtain a nano - modifier;

[0056] S04: Mix the carbon nanotube - calcium titanate combined solution and the nano - modifier according to a weight ratio of 3:5, conduct ball - milling treatment, with a ball - milling speed of 1500 r / min for 2 h. After the ball - milling ends, perform suction filtration and drying to obtain a nano - filler.

[0057] In this example, the mass fraction of the potassium permanganate solution is 5 - 8%; the mass fraction of the urea solution is 2 - 5%.

[0058] In this example, the stirring speed for the stirring modification treatment is 750 - 800 r / min for 1 - 2 h; the ultrasonic power for the ultrasonic treatment is 350 - 400 W for 20 - 30 min.

[0059] The preparation method of the matching - effect filler in this example is as follows:

[0060] S11: Prepare a 5% sodium dodecylbenzenesulfonate solution by mass. Preheat magnesium titanate at 55 - 60 °C for 1 h, and stir the pre - heated magnesium titanate evenly in a sodium dodecylbenzenesulfonate solution that is 3 - 5 times the total weight of magnesium titanate to obtain a magnesium titanate solution;

[0061] S12: Mix the magnesium titanate solution and the matching - effect agent according to a weight ratio of 7:5, conduct ball - milling treatment. After the ball - milling ends, perform suction filtration and drying to obtain the matching - effect filler.

[0062] In this example, the ball - milling speed for the ball - milling treatment of mixing evenly is 1000 - 1200 r / min for 2 h.

[0063] The preparation method of the matching - effect agent in this example is as follows:

[0064] Stir titanium oxide and a hydrochloric acid dopamine solution evenly according to a weight ratio of 2:5 to obtain a titanium oxide solution;

[0065] Subsequently, add 3 - 5 parts of barium carbonate and 1 - 3 parts of hydrotalcite by weight to 4 - 7 parts of the titanium oxide solution, and finally add 1 - 2 parts of sodium stearate, stir evenly, then perform suction filtration and drying to obtain the matching - effect agent.

[0066] In this example, the mass fraction of the hydrochloric acid dopamine solution is 3 - 6%.

[0067] The preparation method of a flame - retardant spandex fabric in this example includes the following steps:

[0068] Step one: First, wind the glass fiber yarn 102 and the hemp fiber yarn 103 spirally around the outer wall of the spandex fiber yarn 101 to form a spandex matrix layer 1;

[0069] Step 2: Then, an inner layer 2 is formed by interweaving flax fiber filaments and aramid fiber yarns. The inner layer 2 is compounded with the upper and lower surfaces of the spandex matrix layer 1 through polyurethane glue, and the dosage of the polyurethane glue is 20 g / m 2 ;

[0070] Step 3: Then, weigh the raw materials of the nano-modified coating agent according to parts by weight, and then mix the raw materials evenly to obtain the nano-modified coating agent. Spray the nano-modified coating agent on the outer surface of the inner layer 2 to form an improved layer 3, and then the flame-retardant spandex fabric can be obtained.

[0071] Example 1: A flame-retardant spandex fabric, including a spandex matrix layer 1, inner layers 2 are fixedly arranged on both the upper surface and the lower surface of the spandex matrix layer 1, and an improved layer 3 is fixedly arranged on the outer surface of the inner layer 2 away from the spandex matrix layer 1;

[0072] The spandex matrix layer 1 is woven with elastic fibers. The elastic fibers include spandex fiber threads 101, and a fiberglass thread 102 and a hemp fiber thread 103 are arranged outside the spandex fiber threads 101. The fiberglass thread 102 and the hemp fiber thread 103 are spirally wound on the outer wall of the spandex fiber threads 101;

[0073] The inner layer 2 is formed by interweaving flax fiber filaments and aramid fiber yarns;

[0074] The improved layer 3 is formed by spraying the nano-modified coating agent on the outer surface of the inner layer 2, and the thickness of the improved layer 3 is 0.2 mm; the thickness of the spandex matrix layer 1 is 0.4 mm; the thickness of the inner layer 2 is 0.3 mm;

[0075] Among them, the nano-modified coating agent includes the following raw materials in parts by weight:

[0076] 45 parts of polyurethane resin, 20 parts of epoxy resin, 7 parts of modified nano filler, 5 parts of synergistic filler, 5 parts of flame retardant, 3 parts of thickener, 2 parts of silane coupling agent, 4 parts of curing agent and 30 parts of solvent.

[0077] The solvent in this example is acetone solvent; the silane coupling agent is silane coupling agent KH560; the flame retardant is magnesium hydroxide; the thickener is methyl cellulose;

[0078] The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; the curing agent is m-xylenediamine.

[0079] The preparation method of the modified nano filler in this example is:

[0080] S01: First, stir the carbon nanotubes sufficiently in a sufficient amount of potassium permanganate solution, then wash with water, filter by suction, and dry to obtain dry carbon nanotubes;

[0081] Add 3 parts of calcium titanate and 2 parts of silicon carbide by weight to 5 parts of a lanthanum chloride solution with a mass fraction of 4%, and then add 1 part of silane coupling agent KH550. Stir well to obtain a calcium titanate solution;

[0082] S02: Stir and modify the dry carbon nanotubes and the calcium titanate solution according to a weight ratio of 3:5. After stirring, a carbon nanotube - calcium titanate combined solution is obtained;

[0083] S03: Prepare a nano - modifier:

[0084] Blend carboxymethyl cellulose, urea solution and yttrium nitrate solution with a mass fraction of 4% evenly according to a weight ratio of 3:1:2 to obtain a carboxymethyl cellulose solution;

[0085] Add 3 parts of nano - bentonite and 2 parts of nano - zirconia by weight to 5 parts of the carboxymethyl cellulose solution, perform ultrasonic treatment, then filter and dry to obtain a nano - modifier;

[0086] S04: Mix and ball - mill the carbon nanotube - calcium titanate combined solution and the nano - modifier according to a weight ratio of 3:5. The ball - mill rotation speed is 1500 r / min, and ball - mill for 2 h. After ball - milling, filter and dry to obtain a nano - filler.

[0087] In this example, the mass fraction of the potassium permanganate solution is 5%; the mass fraction of the urea solution is 2%.

[0088] In this example, the stirring speed for the stirring and modification treatment is 750 r / min, and stir for 1 h; the ultrasonic power for the ultrasonic treatment is 350 W, and ultrasonic for 20 min.

[0089] The preparation method of the matching filler in this example is as follows:

[0090] Prepare a sodium dodecylbenzenesulfonate solution with a mass fraction of 5%. Preheat magnesium titanate at 55 °C for 1 h, and stir the pre - heated magnesium titanate evenly in a sodium dodecylbenzenesulfonate solution that is 3 times the total weight of magnesium titanate to obtain a magnesium titanate solution;

[0091] Mix and ball - mill the magnesium titanate solution and the filling agent according to a weight ratio of 7:5. After ball - milling, filter and dry to obtain a matching filler.

[0092] In this example, the ball - mill rotation speed for the mixing and ball - milling treatment is 1000 r / min, and ball - mill for 2 h.

[0093] The preparation method of the filling agent in this example is as follows:

[0094] Stir titanium oxide and dopamine hydrochloride solution evenly according to a weight ratio of 2:5 to obtain a titanium oxide solution;

[0095] Subsequently, 3 parts of barium carbonate and 1 part of hydrotalcite were added to 4 parts of titanium oxide solution by weight, and finally 1 part of sodium stearate was added. After stirring evenly, filtration and drying were carried out to obtain a filling agent.

[0096] The mass fraction of the dopamine hydrochloride solution in this example is 3%.

[0097] A preparation method of a flame-retardant spandex fabric in this example includes the following steps:

[0098] Step 1: First, glass fiber yarn 102 and hemp fiber yarn 103 are spirally wound around the outer wall of spandex fiber yarn 101 to form a spandex matrix layer 1;

[0099] Step 2: Then, an inner layer 2 is formed by interweaving and knitting flax fiber filaments and aramid fiber yarns. The inner layer 2 is compounded with the upper and lower surfaces of the spandex matrix layer 1 through polyurethane glue, and the dosage of the polyurethane glue is 20 g / m 2 ;

[0100] Step 3: Then, the raw materials of the nano-modified coating agent are weighed according to parts by weight, and then the raw materials are mixed evenly to obtain the nano-modified coating agent. The nano-modified coating agent is sprayed on the outer surface of the inner layer 2 to form an improved layer 3, and the flame-retardant spandex fabric can be obtained.

[0101] Example 2: A flame-retardant spandex fabric, including a spandex matrix layer 1, inner layers 2 are fixedly arranged on both the upper surface and the lower surface of the spandex matrix layer 1, and an improved layer 3 is fixedly arranged on the outer surface of the inner layer 2 away from the spandex matrix layer 1;

[0102] The spandex matrix layer 1 is woven from elastic fibers. The elastic fibers include spandex fiber yarn 101, and glass fiber yarn 102 and hemp fiber yarn 103 are arranged outside the spandex fiber yarn 101, and the glass fiber yarn 102 and the hemp fiber yarn 103 are spirally wound around the outer wall of the spandex fiber yarn 101;

[0103] The inner layer 2 is formed by interweaving and knitting flax fiber filaments and aramid fiber yarns;

[0104] The improved layer 3 is formed by spraying the nano-modified coating agent on the outer surface of the inner layer 2, and the thickness of the improved layer 3 is 0.3 mm; the thickness of the spandex matrix layer 1 is 0.5 mm; the thickness of the inner layer 2 is 0.4 mm;

[0105] Among them, the nano-modified coating agent includes the following raw materials by weight:

[0106] 50 parts of polyurethane resin, 25 parts of epoxy resin, 11 parts of modified nano filler, 9 parts of matching filler, 8 parts of flame retardant, 5 parts of thickener, 4 parts of silane coupling agent, 6 parts of curing agent and 35 parts of solvent.

[0107] The solvent of this embodiment is acetone solvent; the silane coupling agent is silane coupling agent KH560; the flame retardant is magnesium hydroxide; the thickener is methyl cellulose;

[0108] The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

[0109] The preparation method of the modified nanofiller of this embodiment is:

[0110] S01: stirring the carbon nanotubes thoroughly in a sufficient amount of potassium permanganate solution, then washing, filtering, and drying to obtain dry carbon nanotubes;

[0111] 5 parts of calcium titanate and 3 parts of silicon carbide were added to 8 parts of 4% by weight lanthanum chloride solution, followed by adding 2 parts of silane coupling agent KH550 and stirring thoroughly to obtain a calcium titanate solution;

[0112] S02: stirring and modifying the dried carbon nanotubes and calcium titanate solution in a weight ratio of 3:5, and completing the stirring to obtain a carbon nanotube-calcium titanate combined solution;

[0113] S03: Preparation of nano-modifier:

[0114] Carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution were uniformly mixed in a weight ratio of 3:1:2 to obtain a carboxymethyl cellulose solution;

[0115] 5 parts of nano-bentonite and 3 parts of nano-zirconium oxide were added to 7 parts of carboxymethyl cellulose solution by weight, and then ultrasonically treated, and then filtered and dried to obtain a nano-modifier;

[0116] S04: The carbon nanotube-calcium titanate combined solution and the nano-modifier are mixed in a weight ratio of 3:5 and ball-milled at a ball-milling speed of 1500 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain a nano-filler.

[0117] The mass fraction of the potassium permanganate solution in this embodiment is 8%; the mass fraction of the urea solution is 5%.

[0118] The stirring speed of the stirring modification treatment in this embodiment is 800 r / min, and the stirring is 2 hours; the ultrasonic power of the ultrasonic treatment is 400 W, and the ultrasonic treatment is 30 minutes.

[0119] The preparation method of the effective filler of this embodiment is:

[0120] S11: preparing a 5% by mass sodium dodecylbenzene sulfonate solution, preheating magnesium titanate at 60°C for 1 hour, and uniformly stirring the preheated magnesium titanate in the sodium dodecylbenzene sulfonate solution having a weight that is 5 times the total weight of the magnesium titanate to obtain a magnesium titanate solution;

[0121] S12: Mix the magnesium titanate solution and the filling agent in a weight ratio of 7:5, perform ball milling treatment, and after the ball milling is completed, carry out suction filtration and drying to obtain the filling agent with matching effect.

[0122] In this embodiment, the ball milling speed for the mixing and ball milling treatment is 1200 r / min, and the ball milling time is 2 h.

[0123] The preparation method of the filling agent in this embodiment is as follows:

[0124] Stir the titanium oxide and the hydrochloric acid dopamine solution evenly in a weight ratio of 2:5 to obtain the titanium oxide solution;

[0125] Subsequently, add 5 parts of barium carbonate and 3 parts of hydrotalcite by weight to 7 parts of the titanium oxide solution, and finally add 2 parts of sodium stearate, stir evenly, then carry out suction filtration and drying to obtain the filling agent.

[0126] The mass fraction of the hydrochloric acid dopamine solution in this embodiment is 6%.

[0127] A preparation method of a flame-retardant spandex fabric in this embodiment includes the following steps:

[0128] Step 1: First, wind the glass fiber yarn 102 and the hemp fiber yarn 103 spirally around the outer wall of the spandex fiber yarn 101 to form the spandex matrix layer 1;

[0129] Step 2: Then, interweave and braid the flax fiber filaments and the aramid fiber yarns to form the inner layer 2, and the inner layer 2 is compounded with the upper and lower surfaces of the spandex matrix layer 1 through polyurethane glue, and the dosage of the polyurethane glue is 20 g / m 2 ;

[0130] Step 3: Then, weigh the raw materials of the nano-modified coating agent according to weight parts, and then mix the raw materials evenly to obtain the nano-modified coating agent, and spray the nano-modified coating agent on the outer surface of the inner layer 2 to form the improved layer 3, and then the flame-retardant spandex fabric can be obtained.

[0131] Embodiment 3: A flame-retardant spandex fabric, including a spandex matrix layer 1, inner layers 2 are fixedly arranged on both the upper surface and the lower surface of the spandex matrix layer 1, and an improved layer 3 is fixedly arranged on the outer surface of the inner layer 2 away from the spandex matrix layer 1;

[0132] The spandex matrix layer 1 is woven from elastic fibers, and the elastic fibers include a spandex fiber yarn 101, and a glass fiber yarn 102 and a hemp fiber yarn 103 are arranged outside the spandex fiber yarn 101, and the glass fiber yarn 102 and the hemp fiber yarn 103 are spirally wound around the outer wall of the spandex fiber yarn 101;

[0133] The inner layer 2 is formed by interweaving and braiding flax fiber filaments and aramid fiber yarns;

[0134] The improved layer 3 is formed by spraying a nano-modified coating onto the outer surface of the inner layer 2. The thickness of the improved layer 3 is 0.25 mm. The thickness of the spandex base layer 1 is 0.45 mm. The thickness of the inner layer 2 is 0.35 mm.

[0135] The nano-modified coating comprises the following raw materials in parts by weight:

[0136] 47.5 parts of polyurethane resin, 22.5 parts of epoxy resin, 9 parts of modified nanofiller, 7 parts of matching filler, 6.5 parts of flame retardant, 4 parts of thickener, 3 parts of silane coupling agent, 5 parts of curing agent and 32.5 parts of solvent.

[0137] The solvent of this embodiment is acetone solvent; the silane coupling agent is silane coupling agent KH560; the flame retardant is magnesium hydroxide; the thickener is methyl cellulose;

[0138] The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

[0139] The preparation method of the modified nanofiller of this embodiment is:

[0140] S01: stirring the carbon nanotubes thoroughly in a sufficient amount of potassium permanganate solution, then washing, filtering, and drying to obtain dry carbon nanotubes;

[0141] 4 parts of calcium titanate and 2.5 parts of silicon carbide were added to 6.5 parts of 4% by weight lanthanum chloride solution, followed by adding 1.5 parts of silane coupling agent KH550 and stirring thoroughly to obtain a calcium titanate solution;

[0142] S02: stirring and modifying the dried carbon nanotubes and calcium titanate solution in a weight ratio of 3:5, and completing the stirring to obtain a carbon nanotube-calcium titanate combined solution;

[0143] S03: Preparation of nano-modifier:

[0144] Carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution were uniformly mixed in a weight ratio of 3:1:2 to obtain a carboxymethyl cellulose solution;

[0145] 4 parts of nano-bentonite and 2.5 parts of nano-zirconia were added to 6 parts of carboxymethyl cellulose solution by weight, and then ultrasonically treated, and then filtered and dried to obtain a nano-modifier;

[0146] S04: The carbon nanotube-calcium titanate combined solution and the nano-modifier are mixed in a weight ratio of 3:5 and ball-milled at a ball-milling speed of 1500 r / min for 2 h. After the ball-milling is completed, the mixture is filtered and dried to obtain a nano-filler.

[0147] The mass fraction of the potassium permanganate solution in this embodiment is 6.5%; the mass fraction of the urea solution is 3.5%.

[0148] The stirring speed for the stirring modification treatment in this embodiment is 770 r / min, and the stirring time is 1.5 h; the ultrasonic power for the ultrasonic treatment is 375 W, and the ultrasonic treatment time is 25 min.

[0149] The preparation method of the matching effect filler in this embodiment is as follows:

[0150] S11: Prepare a sodium dodecylbenzenesulfonate solution with a mass fraction of 5%. Preheat magnesium titanate at 57 °C for 1 h, and stir the preheated magnesium titanate evenly in a sodium dodecylbenzenesulfonate solution that is 4 times the total weight of magnesium titanate to obtain a magnesium titanate solution;

[0151] S12: Mix the magnesium titanate solution and the filling effect agent in a weight ratio of 7:5, perform ball milling treatment. After the ball milling is completed, filter by suction and dry to obtain the matching effect filler.

[0152] The ball milling speed for the mixing and ball milling treatment in this embodiment is 1100 r / min, and the ball milling time is 2 h.

[0153] The preparation method of the filling effect agent in this embodiment is as follows:

[0154] Stir titanium oxide and a hydrochloric acid dopamine solution evenly in a weight ratio of 2:5 to obtain a titanium oxide solution;

[0155] Subsequently, add 4 parts of barium carbonate and 2 parts of hydrotalcite by weight to 5.5 parts of the titanium oxide solution, and finally add 1.5 parts of sodium stearate, stir evenly, then filter by suction and dry to obtain the filling effect agent.

[0156] The mass fraction of the hydrochloric acid dopamine solution in this embodiment is 4.5%.

[0157] The preparation method of a flame-retardant spandex fabric in this embodiment includes the following steps:

[0158] Step 1: First, helically wind the glass fiber thread 102 and the hemp fiber thread 103 on the outer wall of the spandex fiber thread 101 to form a spandex matrix layer 1;

[0159] Step 2: Then, interweave and braid flax fiber filaments and aramid fiber yarns to form an inner layer 2. The inner layer 2 is compounded with the upper and lower surfaces of the spandex matrix layer 1 through polyurethane glue, and the dosage of the polyurethane glue is 20 g / m 2 ;

[0160] Step 3: Weigh the raw materials of the nano-modified coating agent according to weight parts, then mix the raw materials evenly to obtain the nano-modified coating agent, and spray the nano-modified coating agent on the outer surface of the inner layer 2 to form an improved layer 3, thus obtaining the flame-retardant spandex fabric.

[0161] Comparative Example 1:

[0162] It is different from Example 3 in that the modified nano filler is not added.

[0163] Comparative Example 2:

[0164] It is different from Example 3 in that the carbon nanotube-calcium titanate combined liquid is not added in the preparation of the modified nano filler.

[0165] Comparative Example 3:

[0166] It is different from Example 3 in that the dry carbon nanotubes are not added in the preparation of the carbon nanotube-calcium titanate combined liquid.

[0167] Comparative Example 4:

[0168] It is different from Example 3 in that the calcium titanate liquid is not added in the preparation of the carbon nanotube-calcium titanate combined liquid.

[0169] Comparative Example 5:

[0170] It is different from Example 3 in that calcium titanate and silicon carbide are not added to the calcium titanate liquid.

[0171] Comparative Example 6:

[0172] It is different from Example 3 in that the nano modifier is not added in the preparation of the modified nano filler.

[0173] Comparative Example 7:

[0174] It is different from Example 3 in that nano bentonite and nano zirconia are not added to the nano modifier.

[0175] Comparative Example 8:

[0176] It is different from Example 3 in that the carboxymethyl cellulose solution is not added to the nano modifier.

[0177] Comparative Example 9:

[0178] It is different from Example 3 in that the synergistic filler is not added.

[0179] Comparative Example 10:

[0180] It is different from Example 3 in that the magnesium titanate solution is not added in the preparation of the synergistic filler.

[0181] Comparative Example 11:

[0182] It is different from Example 3 in that the filling agent is not added in the preparation of the synergistic filler.

[0183] Comparative Example 12:

[0184] It is different from Example 3 in that barium carbonate and hydrotalcite are not added to the filling agent.

[0185] Comparative Example 13:

[0186] Different from Example 3, titanium oxide solution was not added to the filling agent.

[0187] The products of Examples 1 to 3 and Comparative Examples 1 to 13 were respectively subjected to performance tests under conventional conditions and weather-resistant and water-wash-resistant conditions, testing flame retardancy, abrasion resistance and elastic properties. The weather-resistant and water-wash-resistant conditions were to place the products under the ultraviolet intensity of 100W / m 2 for 72 h and then wash 50 times. The test results are shown in Table 1.

[0188] Table 1 Performance test results of the products of Examples 1 to 3 and Comparative Examples 1 to 13:

[0189]

[0190] It can be seen from Examples 1 to 3 and Comparative Examples 1 to 13 that the products of Example 3 of the present invention can achieve coordinated improvement in abrasion resistance, elasticity and flame retardancy, and the weather-resistant and water-wash-resistant stability effect of the products is remarkable;

[0191] It can be seen from Examples 1 to 3 and Comparative Examples 1 to 13 that when one of the modified nano-filler and the filling agent is not added in the present invention, the performance of the product deteriorates significantly. By using the modified nano-filler and the filling agent in combination and their coordination, the performance effect of the product is the most obvious;

[0192] When the carbon nanotube-calcium titanate combined liquid is not added in the preparation of the modified nano-filler, the dry carbon nanotube is not added in the preparation of the carbon nanotube-calcium titanate combined liquid, the calcium titanate liquid is not added in the preparation of the carbon nanotube-calcium titanate combined liquid, calcium titanate, silicon carbide is not added to the calcium titanate liquid, the nano-modifier is not added in the preparation of the modified nano-filler, nano-bentonite and nano-zirconia are not added to the nano-modifier, and the carboxymethyl cellulose liquid is not added to the nano-modifier, the performance of the product shows a trend of varying degrees of deterioration. The performance effect of the modified nano-filler prepared by using the nano-modifier obtained by the specific method of the present invention and the modified nano-filler obtained by combining the carbon nanotube-calcium titanate combined liquid of the present invention is the most remarkable, and the effect of using other methods instead is not as obvious as that of the present invention;

[0193] When magnesium titanate liquid is not added in the preparation of the filling agent, the filling agent is not added in the preparation of the filling agent, barium carbonate and hydrotalcite are not added to the filling agent, and titanium oxide liquid is not added to the filling agent, the performance of the product shows a trend of varying degrees of deterioration. Only the filling agent obtained by the method of the present invention has the most remarkable performance effect.

[0194] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

[0195] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flame-retardant spandex fabric, characterized in that, It comprises a spandex base layer (1), an inner layer (2) is fixedly provided on the upper surface and the lower surface of the spandex base layer (1), and an improved layer (3) is fixedly provided on the outer surface of the inner layer (2) away from the spandex base layer (1); The spandex matrix layer (1) is woven from elastic fibers, the elastic fibers comprising a spandex fiber line (101), a glass fiber line (102) and a hemp fiber line (103) being arranged outside the spandex fiber line (101), and the glass fiber line (102) and the hemp fiber line (103) being spirally wound around the outer wall of the spandex fiber line (101); The inner layer (2) is formed by interweaving and knitting flax fiber yarns and aramid fiber yarns; The improved layer (3) is formed by spraying a nano-modified coating onto the outer surface of the inner layer (2), and the thickness of the improved layer (3) is 0.2-0.3 mm; the thickness of the spandex base layer (1) is 0.4-0.5 mm; and the thickness of the inner layer (2) is 0.3-0.4 mm. The nano-modified coating comprises the following raw materials in parts by weight: 45-50 parts of polyurethane resin, 20-25 parts of epoxy resin, 7-11 parts of modified nanofiller, 5-9 parts of matching filler, 5-8 parts of flame retardant, 3-5 parts of thickener, 2-4 parts of silane coupling agent, 4-6 parts of curing agent and 30-35 parts of solvent; The preparation method of the modified nanofiller is: S01: stirring the carbon nanotubes thoroughly in a sufficient amount of potassium permanganate solution, then washing, filtering, and drying to obtain dry carbon nanotubes; 3-5 parts of calcium titanate and 2-3 parts of silicon carbide are added by weight to 5-8 parts of a 4% by weight lanthanum chloride solution, followed by adding 1-2 parts of a silane coupling agent KH550 and stirring thoroughly to obtain a calcium titanate solution; S02: stirring and modifying the dried carbon nanotubes and calcium titanate solution in a weight ratio of 3:5, and completing the stirring to obtain a carbon nanotube-calcium titanate combined solution; S03: Preparation of nano-modifier: Carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution were uniformly mixed in a weight ratio of 3:1:2 to obtain a carboxymethyl cellulose solution; Add 3-5 parts of nano-bentonite and 2-3 parts of nano-zirconia by weight to 5-7 parts of carboxymethyl cellulose solution, perform ultrasonic treatment, and then filter and dry to obtain a nano-modifier; S04: The carbon nanotube-calcium titanate combined solution and the nano-modifier were mixed in a weight ratio of 3:5 and ball-milled at a ball-milling speed of 1500 r / min for 2 h. After the ball-milling was completed, the mixture was filtered and dried to obtain a nano-filler; The preparation method of the effective filler is as follows: S11: preparing a 5% by weight sodium dodecylbenzene sulfonate solution, preheating magnesium titanate at 55-60° C. for 1 hour, and uniformly stirring the preheated magnesium titanate in the sodium dodecylbenzene sulfonate solution having a weight that is 3-5 times the total weight of the magnesium titanate to obtain a magnesium titanate solution; S12: Mix the magnesium titanate solution and the filler in a weight ratio of 7:5 and perform ball milling. After the ball milling is completed, filter and dry to obtain the filler; The preparation method of the filling agent is: Stir titanium oxide and dopamine hydrochloride solution in a weight ratio of 2:5 to obtain titanium oxide solution; Subsequently, 3-5 parts by weight of barium carbonate and 1-3 parts of hydrotalcite are added to 4-7 parts of titanium oxide solution, and finally 1-2 parts of sodium stearate are added. After stirring evenly, filtration and drying are carried out to obtain a filling agent.

2. The flame-retardant spandex fabric according to claim 1, wherein The solvent is an acetone solvent; the silane coupling agent is silane coupling agent KH560; the flame retardant is magnesium hydroxide; the thickening agent is methyl cellulose; The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; the curing agent is m-xylenediamine.

3. The flame-retardant spandex fabric according to claim 1, characterized in that, The mass fraction of the potassium permanganate solution is 5-8%; the mass fraction of the urea solution is 2-5%.

4. The flame-retardant spandex fabric according to claim 1, characterized in that, For the stirring modification treatment, the stirring speed is 750-800 r / min and the stirring time is 1-2 h; for the ultrasonic treatment, the ultrasonic power is 350-400 W and the ultrasonic time is 20-30 min.

5. The flame-retardant spandex fabric according to claim 1, characterized in that, In S12, for the mixing and ball milling treatment, the ball milling speed is 1000-1200 r / min and the ball milling time is 2 h.

6. The flame-retardant spandex fabric according to claim 1, wherein The mass fraction of the dopamine hydrochloride solution is 3-6%.

7. A method for preparing a flame-retardant spandex fabric, which is used to prepare the flame-retardant spandex fabric according to any one of claims 1-6, characterized in that, It includes the following steps: Step 1: First, the glass fiber thread (102) and the hemp fiber thread (103) are spirally wound around the outer wall of the spandex fiber thread (101) to form a spandex matrix layer (1); Step 2: Then, an inner layer (2) is formed by interweaving linen fiber filaments and aramid fiber yarns. The inner layer (2) is compounded with the upper and lower surfaces of the spandex matrix layer (1) through polyurethane glue, and the dosage of the polyurethane glue is 20 g / m 2 ; Step 3: Then, the raw materials of the nano-modified coating agent are weighed according to parts by weight, and then the raw materials are mixed evenly to obtain the nano-modified coating agent. The nano-modified coating agent is sprayed on the outer surface of the inner layer (2) to form an improved layer (3), and thus the flame-retardant spandex fabric can be obtained.

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