Flame-retardant spandex fabric and preparation method thereof

Abstract

The invention relates to the technical field of spandex fabrics, in particular to a flame-retardant spandex fabric and a preparation method thereof.The flame-retardant spandex fabric comprises a spandex base layer, inner layers are fixedly arranged on the upper surface and the lower surface of the spandex base layer, and improved layers are fixedly arranged on the outer surfaces, away from the spandex base layer, of the inner layers; the spandex base body layer is formed by weaving elastic fibers, and the elastic fibers comprise spandex fiber lines. According to the flame-retardant spandex fabric, the spandex base body layer is matched with the inner layer and the improved layer to form the flame-retardant spandex fabric, the spandex base body layer is formed by spirally winding the glass fiber threads and the hemp fiber threads on the outer walls of the spandex fiber threads, and the elastic performance of a product is optimized.

Description

Technical Field

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

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

[0003] Existing spandex fabrics have poor flame retardancy, poor wear resistance and elasticity. It is difficult to improve the flame retardancy, wear resistance and elasticity of the product in a coordinated and balanced manner. In addition, the product has poor weather resistance and water washing stability, which limits the use efficiency of the product. Summary of the invention

[0004] In view of 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 technology.

[0005] The present invention solves the technical problem by adopting the following technical solution: The present invention provides a flame retardant spandex fabric, comprising a spandex base layer, an inner layer is fixedly disposed on the upper surface and the lower surface of the spandex base layer, and an improved layer is fixedly disposed on the outer surface of the inner layer away from the spandex base layer; The spandex matrix layer is woven with elastic fibers, the elastic fibers include spandex fiber lines, glass fiber lines and hemp fiber lines are arranged outside the spandex fiber lines, and the glass fiber lines and hemp fiber lines are spirally wound around the outer wall of the spandex fiber lines; The inner layer is formed by interweaving flax fiber yarn and aramid fiber yarn; The improved layer is formed by spraying a nano-modified coating onto the outer surface of the inner layer, and the thickness of the improved layer is 0.2-0.3mm; the thickness of the spandex base layer is 0.4-0.5mm; and the thickness of the inner layer is 0.3-0.4mm; 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 nano filler, 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.

[0006] Preferably, the solvent is acetone solvent; the silane coupling agent is silane coupling agent KH560; the flame retardant is magnesium hydroxide; and the thickener is methyl cellulose; The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

[0007] Preferably, the preparation method of the modified nanofiller is: S01: stirring the carbon nanotubes 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 4% by weight lanthanum chloride solution, and then 1-2 parts of silane coupling agent KH550 are added and stirred sufficiently to obtain 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: The carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution are 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 for ultrasonic treatment, and then filter and dry to obtain a nano-modifier; S04: The carbon nanotube-calcium titanate combined liquid and the nano-modifier are mixed in a weight ratio of 3:5, and the mixture is ball-milled at a 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.

[0008] Preferably, the mass fraction of the potassium permanganate solution is 5-8%; the mass fraction of the urea solution is 2-5%.

[0009] 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.

[0010] Preferably, the preparation method of the compounding filler is: S11: preparing a sodium dodecylbenzene sulfonate solution with a mass fraction of 5%, preheating magnesium titanate at 55-60° C. for 1 hour, and uniformly stirring the preheated magnesium titanate in the sodium dodecylbenzene sulfonate solution with a weight of 3-5 times the total weight of the magnesium titanate to obtain a magnesium titanate liquid; S12: Mix the magnesium titanate liquid 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.

[0011] Preferably, the mixing and ball milling treatment is performed at a ball milling speed of 1000-1200 r / min, and the ball milling is performed for 2 hours.

[0012] Preferably, the preparation method of the filling agent is: The titanium oxide and dopamine hydrochloride solution are uniformly stirred in a weight ratio of 2:5 to obtain a titanium oxide liquid; Subsequently, 3-5 parts of barium carbonate and 1-3 parts of hydrotalcite are added to 4-7 parts of titanium oxide liquid by weight, and finally 1-2 parts of sodium stearate are added, stirred evenly, and then filtered and dried to obtain a filling agent.

[0013] Preferably, the mass fraction of the dopamine hydrochloride solution is 3-6%.

[0014] The present invention also provides a method for preparing a flame retardant spandex fabric, comprising the following steps: Step 1: First, the glass fiber thread and the hemp fiber thread are spirally wound around the outer wall of the spandex fiber thread to form a spandex matrix layer; Step 2: The flax fiber yarn and the aramid fiber yarn are interwoven to form the inner layer, and the inner layer is compounded with the upper and lower surfaces of the spandex matrix layer by polyurethane glue. The amount of polyurethane glue used is 20g / m 2 ; Step 3: Weigh the raw materials of the nano-modified coating according to weight, and then mix the raw materials evenly to obtain the nano-modified coating, spray the nano-modified coating onto the outer surface of the inner layer to form a modified layer, and then obtain the flame-retardant spandex fabric.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The flame-retardant spandex fabric of the present invention adopts a spandex base layer, an inner layer and an improved layer to form the flame-retardant spandex fabric. The spandex base layer adopts glass fiber lines and hemp fiber lines to be spirally wound on the outer wall of the spandex fiber lines to optimize the elastic performance of the product. At the same time, the improved layer adopts a nano-modified coating to be sprayed on the outer surface of the inner layer to form the flame-retardant spandex fabric. The nano-modified coating adopts polyurethane resin, epoxy resin, flame retardant, thickener, silane coupling agent, curing agent, solvent and other raw materials. Through the blending of the raw materials, modified nano-fillers and matching fillers are added at the same time. The coordination and synergy between the raw materials are adopted to optimize the flame retardancy, wear resistance and elasticity of the product. The weather resistance and water washing stability of the product are significantly improved. The modified nano-filler adopts carbon nanotubes to be optimized and improved by potassium permanganate solution, and then is stirred and improved with calcium titanate solution. Calcium titanate, silicon carbide and lanthanum chloride solution with a mass fraction of 4% in the calcium titanate solution are combined with silicon carbide. The alkane coupling agent KH550 is prepared into a carbon nanotube-calcium titanate joint liquid through the co-combination and co-assistance of the raw materials, and then the nano modifier is ball-milled for improvement. The nano bentonite, nano zirconium oxide and carboxymethyl cellulose liquid in the nano modifier are blended and optimized together. At the same time, the carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution in the carboxymethyl cellulose liquid are co-blended and coordinated, so that the modified nano filler optimizes the performance coordination and performance stability of the product in the system; the matching filler adopts preheated magnesium titanate to be matched with the sodium dodecylbenzene sulfonate solution for dispersion and blending improvement. At the same time, the barium carbonate and hydrotalcite in the filling agent are matched with the titanium oxide liquid through ball milling improvement, and finally sodium stearate is blended. Through the co-blending and co-combination of the raw materials and the optimization of the synergy, the matching filler prepared has a better synergistic effect with the modified nano filler, and thus the performance of the product is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the layered structure of the present invention; Figure 2 Schematic diagram of the structure of the spandex matrix layer. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] A flame retardant spandex fabric of this embodiment comprises a spandex base layer 1, an inner layer 2 is fixedly provided on the upper and lower surfaces 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 with elastic fibers, 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, and the glass fiber lines 102 and hemp fiber lines 103 are spirally wound around the outer wall of the spandex fiber lines 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 nano filler, 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.

[0019] 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; The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

[0020] The preparation method of the modified nano filler of this embodiment is: S01: stirring the carbon nanotubes 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 4% by weight lanthanum chloride solution, and then 1-2 parts of silane coupling agent KH550 are added and stirred sufficiently to obtain 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: The carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution are 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 for ultrasonic treatment, and then filter and dry to obtain a nano-modifier; S04: The carbon nanotube-calcium titanate combined liquid and the nano-modifier are mixed in a weight ratio of 3:5, and the mixture is ball-milled at a 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.

[0021] The mass fraction of the potassium permanganate solution in this embodiment is 5-8%; the mass fraction of the urea solution is 2-5%.

[0022] The stirring speed of the stirring modification treatment in this embodiment 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.

[0023] The preparation method of the effective filler of this embodiment is: S11: preparing a sodium dodecylbenzene sulfonate solution with a mass fraction of 5%, preheating magnesium titanate at 55-60° C. for 1 hour, and uniformly stirring the preheated magnesium titanate in the sodium dodecylbenzene sulfonate solution with a weight of 3-5 times the total weight of the magnesium titanate to obtain a magnesium titanate liquid; S12: Mix the magnesium titanate liquid 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.

[0024] The mixing and ball milling process of this embodiment has a ball milling speed of 1000-1200 r / min and the ball milling is performed for 2 hours.

[0025] The preparation method of the filling agent of this embodiment is: The titanium oxide and dopamine hydrochloride solution are uniformly stirred in a weight ratio of 2:5 to obtain a titanium oxide liquid; Subsequently, 3-5 parts of barium carbonate and 1-3 parts of hydrotalcite are added to 4-7 parts of titanium oxide liquid by weight, and finally 1-2 parts of sodium stearate are added, stirred evenly, and then filtered and dried to obtain a filling agent.

[0026] The mass fraction of the dopamine hydrochloride solution in this embodiment is 3-6%.

[0027] A method for preparing a flame-retardant spandex fabric in this embodiment comprises the following steps: Step 1: First, the glass fiber line 102 and the hemp fiber line 103 are spirally wound around the outer wall of the spandex fiber line 101 to form a spandex matrix layer 1; Step 2: The flax fiber yarn and the aramid fiber yarn are interwoven to form the inner layer 2, and the inner layer 2 is compounded with the upper and lower surfaces of the spandex base layer 1 by polyurethane glue, and the amount of polyurethane glue used is 20g / m 2 ; Step 3: Weigh the raw materials of the nano-modified coating according to weight, and then mix the raw materials evenly to obtain the nano-modified coating, spray the nano-modified coating onto the outer surface of the inner layer 2 to form the improved layer 3, and then obtain the flame-retardant spandex fabric.

[0028] Embodiment 1: A flame retardant spandex fabric, comprising a spandex base layer 1, an inner layer 2 is fixedly disposed on the upper surface and the lower surface of the spandex base layer 1, and an improved layer 3 is fixedly disposed on the outer surface of the inner layer 2 away from the spandex base layer 1; The spandex matrix layer 1 is woven with elastic fibers, 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, and the glass fiber lines 102 and hemp fiber lines 103 are spirally wound around the outer wall of the spandex fiber lines 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 mm; the thickness of the spandex base layer 1 is 0.4 mm; and the thickness of the inner layer 2 is 0.3 mm; The nano-modified coating comprises the following raw materials in parts by weight: 45 parts of polyurethane resin, 20 parts of epoxy resin, 7 parts of modified nano filler, 5 parts of matching 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.

[0029] 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; The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

[0030] The preparation method of the modified nano filler of this embodiment is: S01: stirring the carbon nanotubes in a sufficient amount of potassium permanganate solution, then washing, filtering and drying to obtain dry carbon nanotubes; 3 parts of calcium titanate and 2 parts of silicon carbide are added by weight to 5 parts of 4% by weight lanthanum chloride solution, and then 1 part of silane coupling agent KH550 is added and stirred sufficiently to obtain 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: The carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution are uniformly mixed in a weight ratio of 3:1:2 to obtain a carboxymethyl cellulose solution; Add 3 parts of nano-bentonite and 2 parts of nano-zirconia by weight into 5 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 liquid 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.

[0031] The mass fraction of the potassium permanganate solution in this embodiment is 5%; the mass fraction of the urea solution is 2%.

[0032] The stirring speed of the stirring modification treatment in this embodiment is 750 r / min, and the stirring is for 1 hour; the ultrasonic power of the ultrasonic treatment is 350 W, and the ultrasonic treatment is for 20 minutes.

[0033] The preparation method of the effective filler of this embodiment is: S11: preparing a sodium dodecylbenzene sulfonate solution with a mass fraction of 5%, preheating magnesium titanate at 55° C. for 1 hour, and stirring the preheated magnesium titanate in the sodium dodecylbenzene sulfonate solution with a weight that is 3 times the total weight of the magnesium titanate to obtain a magnesium titanate liquid; S12: Mix the magnesium titanate liquid 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.

[0034] The mixing and ball milling process in this embodiment was carried out at a ball milling speed of 1000 r / min and the ball milling was carried out for 2 h.

[0035] The preparation method of the filling agent of this embodiment is: The titanium oxide and dopamine hydrochloride solution are uniformly stirred in a weight ratio of 2:5 to obtain a titanium oxide liquid; Subsequently, 3 parts of barium carbonate and 1 part of hydrotalcite were added to 4 parts of titanium oxide liquid according to weight, and finally 1 part of sodium stearate was added, stirred evenly, and then filtered and dried to obtain a filling agent.

[0036] The mass fraction of the dopamine hydrochloride solution in this embodiment is 3%.

[0037] A method for preparing a flame-retardant spandex fabric in this embodiment comprises the following steps: Step 1: First, the glass fiber line 102 and the hemp fiber line 103 are spirally wound around the outer wall of the spandex fiber line 101 to form a spandex matrix layer 1; Step 2: The flax fiber yarn and the aramid fiber yarn are interwoven to form the inner layer 2, and the inner layer 2 is compounded with the upper and lower surfaces of the spandex base layer 1 by polyurethane glue, and the amount of polyurethane glue used is 20g / m 2 ; Step 3: Weigh the raw materials of the nano-modified coating according to weight, and then mix the raw materials evenly to obtain the nano-modified coating, spray the nano-modified coating onto the outer surface of the inner layer 2 to form the improved layer 3, and then obtain the flame-retardant spandex fabric.

[0038] Embodiment 2: A flame retardant spandex fabric, comprising a spandex base layer 1, an inner layer 2 is fixedly disposed on the upper surface and the lower surface of the spandex base layer 1, and an improved layer 3 is fixedly disposed on the outer surface of the inner layer 2 away from the spandex base layer 1; The spandex matrix layer 1 is woven with elastic fibers, 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, and the glass fiber lines 102 and hemp fiber lines 103 are spirally wound around the outer wall of the spandex fiber lines 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 0.3 mm; the thickness of the spandex base layer 1 is 0.5 mm; and the thickness of the inner layer 2 is 0.4 mm. The nano-modified coating comprises the following raw materials in parts by weight: 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.

[0039] 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; The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

[0040] The preparation method of the modified nano filler of this embodiment is: S01: stirring the carbon nanotubes in a sufficient amount of potassium permanganate solution, then washing, filtering and drying to obtain dry carbon nanotubes; 5 parts of calcium titanate and 3 parts of silicon carbide are added by weight to 8 parts of 4% by weight lanthanum chloride solution, and then 2 parts of silane coupling agent KH550 are added and stirred sufficiently to obtain 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: The carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution are uniformly mixed in a weight ratio of 3:1:2 to obtain a carboxymethyl cellulose solution; Add 5 parts of nano-bentonite and 3 parts of nano-zirconia by weight into 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 liquid 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.

[0041] The mass fraction of the potassium permanganate solution in this embodiment is 8%; the mass fraction of the urea solution is 5%.

[0042] The stirring speed of the stirring modification treatment in this embodiment is 800 r / min, and the stirring is for 2 hours; the ultrasonic power of the ultrasonic treatment is 400 W, and the ultrasonic treatment is for 30 minutes.

[0043] The preparation method of the effective filler of this embodiment is: S11: preparing a sodium dodecylbenzene sulfonate solution with a mass fraction of 5%, preheating magnesium titanate at 60° C. for 1 h, and stirring the preheated magnesium titanate in the sodium dodecylbenzene sulfonate solution with a weight that is 5 times the total weight of the magnesium titanate to obtain a magnesium titanate liquid; S12: Mix the magnesium titanate liquid 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.

[0044] The mixing and ball milling process in this embodiment was carried out at a ball milling speed of 1200 r / min and the ball milling was carried out for 2 h.

[0045] The preparation method of the filling agent of this embodiment is: The titanium oxide and dopamine hydrochloride solution are uniformly stirred in a weight ratio of 2:5 to obtain a titanium oxide liquid; Subsequently, 5 parts of barium carbonate and 3 parts of hydrotalcite were added to 7 parts of titanium oxide liquid according to weight, and finally 2 parts of sodium stearate were added, stirred evenly, and then filtered and dried to obtain a filling agent.

[0046] The mass fraction of the dopamine hydrochloride solution in this embodiment is 6%.

[0047] A method for preparing a flame-retardant spandex fabric in this embodiment comprises the following steps: Step 1: First, the glass fiber line 102 and the hemp fiber line 103 are spirally wound around the outer wall of the spandex fiber line 101 to form a spandex matrix layer 1; Step 2: The flax fiber yarn and the aramid fiber yarn are interwoven to form the inner layer 2, and the inner layer 2 is compounded with the upper and lower surfaces of the spandex base layer 1 by polyurethane glue, and the amount of polyurethane glue used is 20g / m 2 ; Step 3: Weigh the raw materials of the nano-modified coating according to weight, and then mix the raw materials evenly to obtain the nano-modified coating, spray the nano-modified coating onto the outer surface of the inner layer 2 to form the improved layer 3, and then obtain the flame-retardant spandex fabric.

[0048] Embodiment 3: A flame retardant spandex fabric, comprising a spandex base layer 1, an inner layer 2 is fixedly disposed on the upper surface and the lower surface of the spandex base layer 1, and an improved layer 3 is fixedly disposed on the outer surface of the inner layer 2 away from the spandex base layer 1; The spandex matrix layer 1 is woven with elastic fibers, 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, and the glass fiber lines 102 and hemp fiber lines 103 are spirally wound around the outer wall of the spandex fiber lines 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 0.25 mm; the thickness of the spandex base layer 1 is 0.45 mm; and the thickness of the inner layer 2 is 0.35 mm. The nano-modified coating comprises the following raw materials in parts by weight: 47.5 parts of polyurethane resin, 22.5 parts of epoxy resin, 9 parts of modified nano filler, 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.

[0049] 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; The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

[0050] The preparation method of the modified nano filler of this embodiment is: S01: stirring the carbon nanotubes in a sufficient amount of potassium permanganate solution, then washing, filtering and drying to obtain dry carbon nanotubes; 4 parts of calcium titanate and 2.5 parts of silicon carbide are added by weight to 6.5 parts of 4% by weight lanthanum chloride solution, and then 1.5 parts of silane coupling agent KH550 are added and stirred sufficiently to obtain 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: The carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution are uniformly mixed in a weight ratio of 3:1:2 to obtain a carboxymethyl cellulose solution; 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; S04: The carbon nanotube-calcium titanate combined liquid and the nano-modifier are mixed in a weight ratio of 3:5, and the mixture is ball-milled at a 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.

[0051] The mass fraction of the potassium permanganate solution in this embodiment is 6.5%; the mass fraction of the urea solution is 3.5%.

[0052] The stirring speed of the stirring modification treatment in this embodiment is 770r / min, and the stirring is 1.5h; the ultrasonic power of the ultrasonic treatment is 375W, and the ultrasonic treatment is 25min.

[0053] The preparation method of the effective filler of this embodiment is: S11: preparing a sodium dodecylbenzene sulfonate solution with a mass fraction of 5%, preheating magnesium titanate at 57° C. for 1 h, and stirring the preheated magnesium titanate in the sodium dodecylbenzene sulfonate solution with a weight that is 4 times the total weight of the magnesium titanate to obtain a magnesium titanate solution; S12: Mix the magnesium titanate liquid 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.

[0054] The mixing ball milling process in this embodiment has a ball milling speed of 1100 r / min and a ball milling time of 2 h.

[0055] The preparation method of the filling agent of this embodiment is: The titanium oxide and dopamine hydrochloride solution are uniformly stirred in a weight ratio of 2:5 to obtain a titanium oxide liquid; Subsequently, 4 parts of barium carbonate and 2 parts of hydrotalcite were added to 5.5 parts of titanium oxide liquid by weight, and finally 1.5 parts of sodium stearate were added, stirred evenly, and then filtered and dried to obtain a filling agent.

[0056] The mass fraction of the dopamine hydrochloride solution in this embodiment is 4.5%.

[0057] A method for preparing a flame-retardant spandex fabric in this embodiment comprises the following steps: Step 1: First, the glass fiber line 102 and the hemp fiber line 103 are spirally wound around the outer wall of the spandex fiber line 101 to form a spandex matrix layer 1; Step 2: The flax fiber yarn and the aramid fiber yarn are interwoven to form the inner layer 2, and the inner layer 2 is compounded with the upper and lower surfaces of the spandex base layer 1 by polyurethane glue, and the amount of polyurethane glue used is 20g / m 2 ; Step 3: Weigh the raw materials of the nano-modified coating according to weight, and then mix the raw materials evenly to obtain the nano-modified coating, spray the nano-modified coating onto the outer surface of the inner layer 2 to form the improved layer 3, and then obtain the flame-retardant spandex fabric.

[0058] Comparative Example 1: The difference from Example 3 is that no modified nanofiller is added.

[0059] Comparative Example 2: The difference from Example 3 is that no carbon nanotube-calcium titanate combined liquid is added in the preparation of the modified nanofiller.

[0060] Comparative Example 3: The difference from Example 3 is that no dried carbon nanotubes are added in the preparation of the carbon nanotube-calcium titanate combined solution.

[0061] Comparative Example 4: The difference from Example 3 is that no calcium titanate solution is added in the preparation of the carbon nanotube-calcium titanate combined solution.

[0062] Comparative Example 5: The difference from Example 3 is that no calcium titanate or silicon carbide is added to the calcium titanate solution.

[0063] Comparative Example 6: The difference from Example 3 is that no nano modifier is added in the preparation of the modified nano filler.

[0064] Comparative Example 7: The difference from Example 3 is that no nano-bentonite or nano-zirconia is added to the nano-modifier.

[0065] Comparative Example 8: The difference from Example 3 is that no carboxymethyl cellulose solution is added to the nano-modifier.

[0066] Comparative Example 9: The difference from Example 3 is that no formulation filler is added.

[0067] Comparative Example 10: The difference from Example 3 is that magnesium titanate liquid is not added in the preparation of the effective filler.

[0068] Comparative Example 11: The difference from Example 3 is that no filling agent is added during the preparation of the compounding filler.

[0069] Comparative Example 12: The difference from Example 3 is that no barium carbonate or hydrotalcite is added to the filler.

[0070] Comparative Example 13: The difference from Example 3 is that no titanium oxide liquid is added to the filler.

[0071] The products of Examples 1 to 3 and Comparative Examples 1 to 13 were tested for flame retardancy, wear resistance and elasticity under normal conditions and weather resistance and water washing conditions. The weather resistance and water washing conditions were as follows: the products were placed under 100W / m2 The samples were irradiated under ultraviolet intensity for 72 hours and then washed with water 50 times. The test results are shown in Table 1.

[0072] Table 1 Product performance test results of Examples 1 to 3 and Comparative Examples 1 to 13:

[0073] It can be seen from Examples 1 to 3 and Comparative Examples 1 to 13 that the wear resistance, elasticity and flame retardancy of the product of Example 3 of the present invention can be improved in a coordinated manner, and the weather resistance and water washing stability of the product are remarkable; From Examples 1 to 3 and Comparative Examples 1 to 13, it can be seen that the performance of the product is significantly deteriorated when the modified nano filler and the matching filler are not added. The modified nano filler and the matching filler are used in combination, and the two work in synergy, and the product performance effect is most obvious. In the preparation of the modified nanofiller, no carbon nanotube-calcium titanate combined liquid was added, no dried carbon nanotubes were added in the preparation of the carbon nanotube-calcium titanate combined liquid, no calcium titanate liquid was added in the preparation of the carbon nanotube-calcium titanate combined liquid, no calcium titanate and silicon carbide were added to the calcium titanate liquid, no nano-modifier was added in the preparation of the modified nanofiller, no nano-bentonite and nano-zirconium oxide were added to the nano-modifier, and no carboxymethyl cellulose liquid was added to the nano-modifier. The performance of the products all showed a trend of deterioration to varying degrees. The modified nanofiller prepared by the nano-modifier obtained by the specific method of the present invention and the modified nanofiller obtained by the carbon nanotube-calcium titanate combined liquid of the present invention had the most significant performance effect. The use of other methods instead was not as obvious as the effect of the present invention. When magnesium titanate liquid is not added in the preparation of the effective filler, when the effective filler is not added in the preparation of the effective filler, when barium carbonate and hydrotalcite are not added to the effective filler, and when titanium oxide liquid is not added to the effective filler, the performance of the products all tends to deteriorate to varying degrees. Only when the effective filler is obtained by the method of the present invention, the performance effect of the product is the most significant.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0075] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes 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 base layer (1) is woven from elastic fibers, the elastic fibers comprising spandex fiber lines (101), glass fiber lines (102) and hemp fiber lines (103) are arranged outside the spandex fiber lines (101), and the glass fiber lines (102) and hemp fiber lines (103) are spirally wound around the outer wall of the spandex fiber lines (101); The inner layer (2) is formed by interweaving 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 nano filler, 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.

2. The flame retardant spandex fabric according to claim 1, characterized in that: The solvent is acetone solvent; the silane coupling agent is silane coupling agent KH560; the flame retardant is magnesium hydroxide; and the thickener is methyl cellulose; The solid content of the polyurethane resin is 35%; the epoxy resin is bisphenol A epoxy resin; and the curing agent is m-xylylenediamine.

3. The flame retardant spandex fabric according to claim 1, characterized in that: The preparation method of the modified nano filler is: S01: stirring the carbon nanotubes 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 4% by weight lanthanum chloride solution, and then 1-2 parts of silane coupling agent KH550 are added and stirred sufficiently to obtain 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: The carboxymethyl cellulose, urea solution and 4% by mass yttrium nitrate solution are 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 for ultrasonic treatment, and then filter and dry to obtain a nano-modifier; S04: The carbon nanotube-calcium titanate combined liquid and the nano-modifier are mixed in a weight ratio of 3:5, and the mixture is ball-milled at a 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.

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

5. The flame retardant spandex fabric according to claim 3, characterized in that: The stirring speed of the stirring modification treatment is 750-800r / min, and the stirring is 1-2h; the ultrasonic power of the ultrasonic treatment is 350-400W, and the ultrasonic treatment is 20-30min.

6. The flame retardant spandex fabric according to claim 1, characterized in that: The preparation method of the effective filler is as follows: S11: preparing a sodium dodecylbenzene sulfonate solution with a mass fraction of 5%, preheating magnesium titanate at 55-60° C. for 1 hour, and uniformly stirring the preheated magnesium titanate in the sodium dodecylbenzene sulfonate solution with a weight of 3-5 times the total weight of the magnesium titanate to obtain a magnesium titanate liquid; S12: Mix the magnesium titanate liquid 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.

7. The flame retardant spandex fabric according to claim 6, characterized in that: The mixing and ball milling treatment is performed at a ball milling speed of 1000-1200 r / min, and the ball milling is performed for 2 hours.

8. The flame retardant spandex fabric according to claim 6, characterized in that: The preparation method of the filling agent is: The titanium oxide and dopamine hydrochloride solution are uniformly stirred in a weight ratio of 2:5 to obtain a titanium oxide liquid; Subsequently, 3-5 parts of barium carbonate and 1-3 parts of hydrotalcite are added to 4-7 parts of titanium oxide liquid by weight, and finally 1-2 parts of sodium stearate are added, stirred evenly, and then filtered and dried to obtain a filling agent.

9. The flame retardant spandex fabric according to claim 8, characterized in that: The mass fraction of the dopamine hydrochloride solution is 3-6%.

10. A method for preparing a flame retardant spandex fabric, used for preparing the flame retardant spandex fabric as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: firstly, a glass fiber thread (102) and a hemp fiber thread (103) are spirally wound around the outer wall of a spandex fiber thread (101) to form a spandex matrix layer (1); Step 2: The flax fiber yarn and the aramid fiber yarn are interwoven to form an inner layer (2), and the inner layer (2) is compounded with the upper and lower surfaces of the spandex base layer (1) by polyurethane glue, and the amount of polyurethane glue used is 20g / m 2 ; Step 3: Weigh the raw materials of the nano-modified coating according to weight, and then mix the raw materials evenly to obtain the nano-modified coating, and spray the nano-modified coating onto the outer surface of the inner layer (2) to form a modified layer (3), thereby obtaining a flame-retardant spandex fabric.

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