Supercritical lightweight fabric and production method thereof

Abstract

The invention belongs to the technical field of fabrics, and particularly discloses a supercritical light-weight fabric and a production method thereof. The supercritical light-weight fabric is formed by weaving warps and wefts, supercritical polymer foaming fibers serve as the warps, bamboo charcoal fibers serve as the wefts, and the preparation method of the bamboo charcoal fibers comprises the following steps that the bamboo charcoal fibers are dispersed in a salicylic acid solution, stirred, washed with water, then dispersed in a sodium carbonate solution, stirred, washed with water and then dispersed in deionized water; and adding the carbon nanotube composite titanium dioxide nanowire and the tea polyphenol composite chitosan, stirring at the temperature of 60-65 DEG C, and drying to obtain the bamboo charcoal fiber. Various raw materials are mixed, and the obtained fabric has good mechanical properties, wear resistance and durability.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of fabrics, in particular to a supercritical lightweight fabric and a production method thereof. BACKGROUND

[0002] A fabric is a material used to make clothes. As one of the three elements of clothes, the fabric not only has durability and washability, but also presents color and shape performance effects of different clothes. With the pursuit of diversity of clothes, the requirements for the types of fabrics are also getting higher and higher. Fabrics are divided into linen blended fabrics, antibacterial and stain-resistant composite fabrics according to functions. The linen blended fabric improves the wrinkle resistance and softness of linen, and the antibacterial and stain-resistant composite fabric enhances the antibacterial and stain-resistant properties. Fabrics with different functions have different effects.

[0003] The supercritical lightweight fabric is a fabric with special performance made by using a supercritical foaming technology. A gas in a supercritical state is injected into a polymer material, the gas is fully and uniformly mixed / diffused with the molten raw material to form a single-phase mixed sol, the sol is made to have a large pressure drop by adjusting temperature, pressure and other parameters, so that the gas is precipitated to form a large number of bubble nuclei, and in the subsequent cooling and forming process, the bubble nuclei continuously grow and form, and finally a lightweight material with a microporous structure is obtained.

[0004] The supercritical lightweight fabric has the advantages of lightweight, excellent chemical corrosion resistance and high resilience. However, the microporous structure makes the material surface more easily pierced or torn by sharp objects, and the cell edge will be damaged after long-term friction, thereby affecting the durability of the fabric. SUMMARY

[0005] In order to improve the problem that the edge will be damaged during long-term use of the fabric, the application provides a supercritical lightweight fabric and a production method thereof.

[0006] The application provides a supercritical lightweight fabric, which adopts the following technical scheme: A supercritical lightweight fabric is woven by warp and weft, wherein a supercritical polymer foaming fiber is used as the warp, and a bamboo charcoal fiber is used as the weft. The preparation method of the bamboo charcoal fiber comprises the following steps: dispersing the bamboo charcoal fiber in a salicylic acid solution, stirring for 4-6 min, washing with water, dispersing in a sodium carbonate solution again, stirring for 3-5 min, washing with water, dispersing in deionized water again, adding carbon nanotube composite titanium dioxide nanowire and tea polyphenol composite chitosan, stirring at a temperature of 60-65 DEG C for 1-2 h, and drying to obtain the bamboo charcoal fiber.

[0007] By adopting the above technical scheme, the supercritical lightweight fabric is woven by warp and weft, the supercritical polymer foaming fiber is warp, the supercritical fluid forms uniform micropores in the polymer, the fiber density is greatly reduced after foaming, has good porosity, reduces the overall fabric weight, and the foamed fiber still has good tensile strength, air permeability, high resilience and heat insulation.

[0008] In the preparation method of the bamboo charcoal fiber, salicylic acid dissolves the amorphous carbon layer on the surface of the bamboo charcoal fiber, exposes more microporous structure, increases the specific surface area, and the sodium carbonate solution further erodes the surface of the bamboo charcoal fiber, increases the micropore size, so that the surface of the bamboo charcoal fiber is negatively charged, which is helpful for the subsequent adsorption of the carbon nanotube composite titanium dioxide nanowire and the tea polyphenol composite chitosan.

[0009] The carbon nanotube composite titanium dioxide nanowire has photocatalytic antibacterial performance, mechanical properties and wear resistance, can be adsorbed in the micropores and on the surface of the bamboo charcoal fiber, the surface of the bamboo charcoal fiber mainly contains carboxylic acid groups and hydroxyl groups after sodium carbonate treatment, the carbon nanotube composite titanium dioxide nanowire surface has hydroxyl groups, carboxyl groups and Ti-OH groups, and the two are combined by electrostatic action and hydrogen bond, increasing the mechanical properties, antibacterial properties, adsorption and durability of the bamboo charcoal fiber. The sugar ring hydroxyl in the tea polyphenol composite chitosan is bridged with the fiber surface hydroxyl through water molecules to form a three-dimensional hydrogen bond network, the catechol in tea polyphenol forms a double hydrogen bond with the fiber surface hydroxyl, and the hydroxyl on the surface of the carbon nanotube composite titanium dioxide nanowire forms a five-membered ring chelate with the catechol in tea polyphenol, so that the carbon nanotube composite titanium dioxide nanowire is firmly adsorbed on the surface of the bamboo charcoal fiber, further improving the performance stability of the prepared bamboo charcoal fiber, and improving the mechanical properties, wear resistance and durability of the bamboo charcoal fiber. Subsequently, the supercritical polymer foaming fiber is woven, improving the wear resistance, mechanical properties and durability of the supercritical lightweight fabric.

[0010] Preferably, the mass ratio of the bamboo charcoal fiber, the carbon nanotube composite titanium dioxide nanowire and the tea polyphenol composite chitosan is 1:0.6-0.7:0.2-0.3.

[0011] By adopting the above technical scheme, the mass ratio of the bamboo charcoal fiber, the carbon nanotube composite titanium dioxide nanowire and the tea polyphenol composite chitosan is further limited, and the obtained bamboo charcoal fiber has excellent mechanical properties, wear resistance and durability. The carbon nanotube composite titanium dioxide nanowire has good adsorption and mechanical strength, can be adsorbed on the surface and pores of the bamboo charcoal fiber, and improves the mechanical properties and wear resistance of the bamboo charcoal fiber. The functional groups in the tea polyphenol composite chitosan can be adsorbed with the functional groups in the bamboo charcoal fiber and the carbon nanotube composite titanium dioxide nanowire to form a three-dimensional network, further improving the structural stability of the bamboo charcoal fiber, and thereby improving the mechanical properties and wear resistance of the bamboo charcoal fiber. Subsequently, it is applied to the fabric, improving the mechanical properties and wear resistance of the fabric.

[0012] Preferably, the titanium dioxide nanoparticles, carbon nanotubes, and sodium dodecyl benzene sulfonate are dispersed in deionized water, ultrasonic for 30-35 min, filtered, added to a sodium hydroxide solution, and hydrothermally reacted at 120-130℃ for 5-6h. After the reaction is completed, centrifugal separation is performed, and repeated washing with dilute hydrochloric acid and water is performed until neutral. After freeze-drying, calcination is performed at 500-510℃ under a nitrogen atmosphere for 2-3h to obtain carbon nanotube-titanium dioxide nanowires. The carbon nanotube-titanium dioxide nanowires are dispersed in deionized water, and polyvinylpyrrolidone and sodium alginate are added. Stirring is performed at a temperature of 80-85℃ for 1-2h, and drying is performed to obtain carbon nanotube composite titanium dioxide nanowires.

[0013] By using the above technical solution, the titanium dioxide nanoparticles are used as a precursor, recrystallized into nanowires under hydrothermal conditions, the carbon nanotubes provide a one-dimensional skeleton, and a heterojunction is formed between the carbon nanotubes and the TiO2 through π-π stacking, thereby enhancing the structural strength of the titanium dioxide nanoparticles. The sodium dodecyl benzene sulfonate improves the dispersibility of the titanium dioxide nanoparticles and the carbon nanotubes, and avoids agglomeration. In the sodium hydroxide solution, the carboxyl groups on the surface of the carbon nanotubes form Ti-O-C bonds with the TiO2 precursor, guiding the TiO2 to grow along the axis of the carbon nanotubes, forming a "CNT core-TiO2 shell" structure, and improving the structural strength of the carbon nanotube-titanium dioxide nanowires. The sodium dodecyl benzene sulfonate and organic residues are removed by calcination, promoting the perfection of the TiO2 crystal form, and further improving the structural strength of the carbon nanotube-titanium dioxide nanowires.

[0014] The polyvinylpyrrolidone improves the dispersibility of the carbon nanotube-titanium dioxide nanowires and prevents agglomeration. The carboxylate groups of the sodium alginate form hydrogen bonds with the TiO2 surface hydroxyl groups, forming a continuous gel layer. After drying, the mechanical strength, wear resistance, and hydrophilicity of the nanowires are improved, which is helpful for subsequent cooperation with bamboo charcoal fibers and improves the corresponding performance of the bamboo charcoal fibers.

[0015] Preferably, the mass ratio of the titanium dioxide nanoparticles, the carbon nanotubes, and the sodium alginate is 1:0.6-0.7:0.2-0.3.

[0016] By adopting the technical scheme, the mass ratio of the titanium dioxide nanoparticles, the carbon nanotubes and the sodium alginate is limited in a certain range, and the mechanical property and the structural strength of the titanium dioxide nanoparticles are improved. The titanium dioxide nanoparticles have a large number of hydroxyl groups on the surface, high specific surface area and chemical activity, the carbon nanotubes have excellent mechanical strength, and the carbon nanotubes make the TiO2 grow along the axial direction of the carbon nanotubes to form a structure of "CNT core-TiO2 shell". The sodium alginate molecular chain contains a large number of carboxyl groups and hydroxyl groups, has good water solubility, and is easy to form a gel network. The carbon nanotube-titanium dioxide nanowire structure can be coated, the tensile strength and the toughness of the carbon nanotube composite titanium dioxide nanowire are improved, the carbon nanotube composite titanium dioxide nanowire is mixed with the bamboo charcoal fiber subsequently, the corresponding performance of the bamboo charcoal fiber is improved, and the comprehensive performance of the fabric is further improved.

[0017] Preferably, the preparation method of the tea polyphenol composite chitosan comprises the following steps: dispersing chitosan in an acetic acid solution, adding tea polyphenol, stirring for 25-30 min at room temperature to obtain a mixed solution; The hydroxypropyl starch is dispersed in deionized water, uniformly stirred at a temperature of 50-55℃, and then the silicon dioxide and 3-aminopropyl triethoxysilane are added and continuously stirred for 1-2 h, and then the mixture is dried to obtain a mixture; The mixture is added to the mixed solution, stirred at a temperature of 60-65℃ for 2-3 h, and then dried to obtain the tea polyphenol composite chitosan.

[0018] By adopting the technical scheme, the chitosan is dissolved in the acetic acid solution, the amino groups are protonated to form a transparent viscous solution, the tea polyphenol is added, the phenolic hydroxyl groups of the tea polyphenol are combined with the amino groups of the chitosan through hydrogen bonds to form a stable composite, and the film-forming property of the subsequent chitosan is improved.

[0019] After the hydroxypropyl starch is dissolved in hot water at 50-55℃, the molecular chain is stretched to form a flexible gel network, the introduction of the hydroxypropyl improves the water solubility and flexibility of the starch, the silicon dioxide has excellent mechanical properties and wear resistance, and is dispersed in the starch water solution structure. The ethoxyl groups of the 3-aminopropyl triethoxysilane are hydrolyzed and combined with the surface hydroxyl groups of the SiO2, the amino groups are exposed to the surface and combined with the hydroxypropyl starch, so that the composite structure is stable, the mechanical properties, the adsorption properties and the wear resistance of the composite are improved, and the subsequent combination with the bamboo charcoal fiber, the carbon nanotube composite titanium dioxide nanowire and the bamboo charcoal fiber improves the comprehensive performance of the bamboo charcoal fiber.

[0020] Preferably, the mass ratio of the chitosan, the silicon dioxide and the hydroxypropyl starch is 1:0.4-0.5:0.1-0.2.

[0021] By adopting the technical scheme, the mass ratio of chitosan, silicon dioxide and hydroxypropyl starch is limited in a certain range, and the tea polyphenol composite chitosan obtained has excellent mechanical properties, adsorption and stability. The silicon dioxide has excellent mechanical properties and wear resistance, the chitosan has excellent film forming property, and the hydroxypropyl starch has excellent adhesion. The SiO2 is uniformly dispersed in the chitosan matrix, the tensile strength of the material is improved through physical filling and stress transfer effect, the hydrogen bond network is formed between the hydroxyl groups of the hydroxypropyl starch and the amino groups of the chitosan, the intermolecular force is enhanced, the crack propagation is reduced, and the toughness and impact resistance of the material are improved. Subsequently applied to the bamboo charcoal fiber, the corresponding performance of the bamboo charcoal fiber is improved.

[0022] Preferably, the preparation method of the supercritical polymer foaming fiber comprises the following steps: The thermoplastic elastomer, EVA, talcum powder, epoxy chain extender and hindered phenolic antioxidant are mixed, melt extruded and dried to obtain a filament; The filament is immersed in a supercritical fluid, and after immersion, the gas is locked at low temperature to obtain an immersed filament; The immersed filament is heated and foamed, shaped and drawn to obtain a foaming fiber.

[0023] By adopting the above technical scheme, the thermoplastic polyester elastomer provides high elasticity and fatigue resistance, the EVA (ethylene-vinyl acetate copolymer) improves processing fluidity, reduces melting temperature and enhances flexibility. The talcum powder acts as a nucleating agent to promote uniform bubble formation during foaming and reduce bubble coalescence. The epoxy chain extender enhances the crosslinking between molecular chains, improves the melt strength and prevents bubble rupture during foaming. The hindered phenolic antioxidant inhibits thermal oxidative degradation during high-temperature processing, maintaining stable material properties.

[0024] The supercritical fluid ensures uniform gas release during foaming, forming a microporous structure. Rapid cooling causes gas molecules to be "locked" in the polymer matrix, preventing premature escape and ensuring foaming effectiveness. Shaping and drawing optimize molecular chain orientation, improving fiber strength, and the resulting foaming fiber has good tensile strength and resilience.

[0025] Preferably, the temperature for heating and foaming is 220-230℃, the shaping temperature is 120-130℃, and the drawing speed is 5-5.5m / min.

[0026] By adopting the above technical scheme, by limiting the process parameters of heating and foaming, shaping, residence time and constant speed drawing, the production process of the supercritical lightweight fabric is optimized, ensuring the lightweight, high strength, high resilience and other properties of the fabric.

[0027] Preferably, in the fabric, the warp density is 100-110 ends / inch, and the weft density is 70-80 ends / inch.

[0028] By adopting the technical scheme, the fabric obtained has good air permeability and mechanical properties by limiting the warp density and weft density.

[0029] In a second aspect, the application also provides a production method of the supercritical lightweight fabric, comprising the following steps: twisting one or more supercritical polymer foaming fibers into yarns, twisting one or more bamboo charcoal fibers into wefts, and weaving the warps and wefts into the supercritical lightweight fabric by using a satin process.

[0030] By adopting the technical scheme, the supercritical fluid forms a micro-porous structure in the polymer, and the polymer is expanded by rapid pressure relief to form a lightweight and high-resilience fiber. One or more supercritical polymer foaming fibers are twisted into yarns to balance the strength and flexibility. One or more bamboo charcoal fibers are twisted into wefts to ensure the stability of the functional layer. The obtained fabric has lightweight and high strength, air permeability and antibacterial properties, durability and comfort.

[0031] In summary, the application has the following beneficial effects: 1. In the application, the supercritical lightweight fabric is woven from warps and wefts, the supercritical polymer foaming fiber is the warp, the supercritical fluid forms uniform micro-pores in the polymer, the fiber density is greatly reduced after foaming, has good porosity, reduces the overall fabric weight, and the foamed fiber still has good tensile strength, air permeability, high resilience and thermal insulation.

[0032] 2. In the application, the sugar ring hydroxyl in the tea polyphenol composite chitosan is bridged with the fiber surface hydroxyl through water molecules to form a three-dimensional hydrogen bond network, the catechol in the tea polyphenol forms a double hydrogen bond with the fiber surface hydroxyl, and the hydroxyl on the surface of the carbon nanotube composite titanium dioxide nanowire forms a five-membered ring chelate with the catechol in the tea polyphenol, so that the carbon nanotube composite titanium dioxide nanowire is firmly adsorbed on the surface of the bamboo charcoal fiber, further improving the performance stability of the prepared bamboo charcoal fiber, and improving the mechanical properties, wear resistance and durability of the bamboo charcoal fiber.

[0033] 3. In the application, the sodium alginate molecular chain contains a large number of carboxyl and hydroxyl groups, which can form a gel network and coat the carbon nanotube-titanium dioxide nanowire structure, thereby improving the tensile strength and toughness of the carbon nanotube composite titanium dioxide nanowire, and improving the corresponding properties of the bamboo charcoal fiber after mixing with the bamboo charcoal fiber, and further improving the comprehensive performance of the fabric. DETAILED DESCRIPTION

[0034] The application will be further described in detail below in combination with examples.

[0035] The raw materials used in the examples and comparative examples can be obtained by market purchase.

[0036] Preparation Example 1 A method for preparing carbon nanotube composite titanium dioxide nanowires, comprising the following steps: 1 kg of titanium dioxide nanoparticles, carbon nanotubes, 0.2 kg of sodium dodecyl benzene sulfonate were dispersed in 75 L of deionized water, ultrasonic for 33 min, filtered, added to 20 L of 10 mol / L sodium hydroxide solution, hydrothermal reaction at 120℃ for 6 h, after the reaction was completed, centrifugal separation, repeatedly washed with 10% dilute hydrochloric acid and water until neutral, freeze-dried, calcined at 500℃ under nitrogen atmosphere for 2 h, to obtain carbon nanotube-titanium dioxide nanowires; The carbon nanotube-titanium dioxide nanowires were dispersed in 60 L of deionized water, 0.4 kg of polyvinylpyrrolidone and sodium alginate were added, stirred at a temperature of 82℃ for 1.5 h, dried to obtain carbon nanotube composite titanium dioxide nanowires.

[0037] The mass ratio of titanium dioxide nanoparticles, carbon nanotubes and sodium alginate is 1:0.6:0.3.

[0038] Preparation Example 2 The difference from Preparation Example 1 is that no carbon nanotubes are added.

[0039] Preparation Example 3 The difference from Preparation Example 1 is that no sodium alginate is added.

[0040] Preparation Example 4 The difference from Preparation Example 1 is that the mass ratio of titanium dioxide nanoparticles, carbon nanotubes and sodium alginate is 1:0.7:0.2.

[0041] Preparation Example 5 The difference from Preparation Example 1 is that the mass ratio of titanium dioxide nanoparticles, carbon nanotubes and sodium alginate is 1:0.1:0.6.

[0042] Preparation Example 6 A method for preparing tea polyphenol composite chitosan, comprising the following steps: 2 kg of chitosan was dispersed in 20 L of 5% acetic acid solution, 0.6 kg of tea polyphenol was added, stirred at room temperature for 28 min to obtain a mixed solution; Hydroxypropyl starch was dispersed in 30 L of deionized water, stirred uniformly at a temperature of 52℃, 0.8 kg of 3-aminopropyl triethoxysilane and silicon dioxide were added, and stirring was continued for 1.5 h, and the mixture was dried to obtain a mixture; The mixture was added to the mixed solution, stirred at a temperature of 64℃ for 2.5 h, and dried to obtain tea polyphenol composite chitosan.

[0043] The mass ratio of chitosan, silicon dioxide and hydroxypropyl starch is 1:0.4:0.2.

[0044] Preparation Example 7 The difference from Preparation Example 6 is that no silica is added.

[0045] Preparation Example 8 The difference from Preparation Example 6 is that no hydroxypropyl starch is added.

[0046] Preparation Example 9 The difference from Preparation Example 8 is that the mass ratio of chitosan, silica, and hydroxypropyl starch is 1:0.5:0.1.

[0047] Preparation Example 10 The difference from Preparation Example 6 is that the mass ratio of chitosan, silica, and hydroxypropyl starch is 1:0.05:0.4.

[0048] Example 1 A supercritical lightweight fabric is woven from warp and weft threads, with supercritical polymer foaming fibers as the warp threads and bamboo charcoal fibers as the weft threads. The preparation method of the bamboo charcoal fibers comprises the following steps: dispersing 5 kg of bamboo charcoal fibers in 20 L of a 0.1 mol / L salicylic acid solution, stirring for 5 min, washing with water, then dispersing in 20 L of a 0.7 mol / L sodium carbonate solution, stirring for 4 min, washing with water, then dispersing in 30 L of deionized water, adding carbon nanotube composite titanium dioxide nanowires and tea polyphenol composite chitosan, stirring at a temperature of 65°C for 2 h, and drying to obtain the bamboo charcoal fibers.

[0049] The mass ratio of the bamboo charcoal fibers, carbon nanotube composite titanium dioxide nanowires, and tea polyphenol composite chitosan is 1:0.7:0.2.

[0050] The preparation method of the supercritical polymer foaming fibers comprises the following steps: Thermoplastic elastomer TPEE 50 kg, EVA 20 kg, talcum powder 4 kg, epoxy chain extender (chain extender ADR-4380) 0.8 kg, and hindered phenolic antioxidant (antioxidant 1010) 0.5 kg are mixed, melt extruded at a temperature of 220°C, and dried to obtain a filament with a diameter of 1.92 mm; The filament is immersed in a supercritical fluid (supercritical CO2 fluid), and after immersion, the supercritical fluid is locked at a low temperature to obtain an immersed filament. The solubility of the supercritical fluid in the filament is 0.5 wt.%, and the temperature for locking the supercritical fluid at a low temperature is 0°C. The immersed filament is heated and foamed, channel shaped, and stretched at a constant speed to obtain a foaming fiber.

[0051] The foaming temperature is 220°C, the channel shaping temperature is 120°C, the residence time in the channel is 3 s, and the constant speed stretching speed is 5 m / min.

[0052] The warp density is 100 threads / inch and the weft density is 80 threads / inch.

[0053] The production method of the supercritical lightweight fabric includes the following steps: Three supercritical polymer foamed fibers are twisted into yarns, three bamboo charcoal fibers are twisted into weft threads, and the warp threads and weft threads are woven into a supercritical lightweight fabric by using a satin process.

[0054] The carbon nanotube composite titanium dioxide nanowire is prepared by Preparation Example 1, and the tea polyphenol composite chitosan is prepared by Preparation Example 6.

[0055] Example 2: A supercritical lightweight fabric, which is different from Example 1 in that the mass ratio of the bamboo charcoal fiber, the carbon nanotube composite titanium dioxide nanowire, and the tea polyphenol composite chitosan is 1:0.6:0.3.

[0056] Example 3: A supercritical lightweight fabric, which is different from Example 1 in that the mass ratio of the bamboo charcoal fiber, the carbon nanotube composite titanium dioxide nanowire, and the tea polyphenol composite chitosan is 1:0.2:0.9.

[0057] Example 4: A supercritical lightweight fabric, which is different from Example 1 in that the carbon nanotube composite titanium dioxide nanowire is prepared by Preparation Example 2.

[0058] Example 5: A supercritical lightweight fabric, which is different from Example 1 in that the carbon nanotube composite titanium dioxide nanowire is prepared by Preparation Example 3.

[0059] Example 6: A supercritical lightweight fabric, which is different from Example 1 in that the carbon nanotube composite titanium dioxide nanowire is prepared by Preparation Example 4.

[0060] Example 7: A supercritical lightweight fabric, which is different from Example 1 in that the carbon nanotube composite titanium dioxide nanowire is prepared by Preparation Example 5.

[0061] Example 8: A supercritical lightweight fabric, which is different from Example 1 in that the tea polyphenol composite chitosan is prepared by Preparation Example 7.

[0062] Example 9: A supercritical lightweight fabric, which is different from Example 1 in that the tea polyphenol composite chitosan is prepared by Preparation Example 8.

[0063] Example 10: A supercritical lightweight fabric, which is different from Example 9 in that the tea polyphenol composite chitosan is prepared by Preparation Example 9.

[0064] Example 11: A supercritical lightweight fabric, which is different from Example 9 in that the tea polyphenol composite chitosan is prepared by Preparation Example 10.

[0065] Comparative Example 1 A supercritical lightweight fabric, which is different from Example 1 in that no carbon nanotube composite titanium dioxide nanowires are added.

[0066] Comparative Example 2 A supercritical lightweight fabric, which is different from Example 1 in that no tea polyphenol composite chitosan is added.

[0067] Performance test The supercritical lightweight fabrics prepared from Examples 1-11 and Comparative Examples 1-2 are subjected to performance test. Breaking strength: detection is performed in accordance with GB / T 3923.1-1997 "Determination of breaking strength and elongation of fabrics - strip method".

[0068] Abrasion resistance: detection is performed in accordance with GB / T 21196.2-2007 "Textiles - Determination of abrasion resistance of fabrics - Martindale method - Part 2: determination of specimen damage", a friction load of 1000g is set, and the test sample is continuously rubbed until it is abraded, and the number of rotations of the abrasion tester is detected.

[0069] Elastic recovery rate is detected in accordance with standard FZ / T 01034-2008 "Textiles - Test methods for tensile elastic properties of woven fabrics", a pre-tension of 1N, a fixed load of 25N, a gauge of 100mm, an upward speed of 180mm / min, and a downward speed of 120mm / min are set, each fabric is tested in warp and weft directions for three times, and an average value is taken, and the test results are shown in Table 1.

[0070] Table 1 Test data of examples and comparative examples

[0071] As can be seen from Table 1, the supercritical lightweight fabric prepared from Examples 1-2 has good mechanical properties, abrasion resistance, and mechanical strength, wherein the radial breaking strength of Example 1 is 990N, the weft breaking strength is 850N, the abrasion resistance is 650,000 times, the radial elastic recovery rate is 95.3%, and the weft elastic recovery rate is 96.8%. It can be seen that the supercritical lightweight fabric prepared in the application has good strength, toughness, and abrasion resistance, and various components cooperate with each other to improve the mechanical properties of the supercritical lightweight fabric and prolong the durability of the fabric.

[0072] Example 3 changes the mass ratio of bamboo charcoal fiber, carbon nanotube-composite titanium dioxide nanowire, and tea polyphenol-composite chitosan. Comparative Examples 1-2 do not add carbon nanotube-composite titanium dioxide nanowire and tea polyphenol-composite chitosan. As can be seen from Table 1, the radial / latitudinal breaking strength, wear resistance, and radial / latitudinal elastic recovery test results of Example 3 are significantly worse than those of Examples 1-2, and the corresponding test results of Comparative Examples 1-2 are significantly worse than those of Examples 1-3, indicating that not adding carbon nanotube-composite titanium dioxide nanowire or tea polyphenol-composite chitosan significantly reduces the wear resistance, mechanical properties, and durability of the supercritical lightweight fabric. However, the functional groups in the tea polyphenol-composite chitosan can adsorb with the functional groups in the bamboo charcoal fiber and the carbon nanotube-composite titanium dioxide nanowire to form a three-dimensional network, improving the structural stability of the bamboo charcoal fiber, thereby improving the mechanical properties and wear resistance of the bamboo charcoal fiber. Subsequent application in fabrics improves the mechanical properties and wear resistance of the fabric.

[0073] The preparation methods of carbon nanotube composite titanium dioxide nanowires in Examples 4-5 do not add carbon nanotubes and sodium alginate respectively. Examples 6-7 change the mass ratio of titanium dioxide nanoparticles, carbon nanotubes and sodium alginate. It can be seen from Table 1 that the test results of radial / latitudinal breaking strength, wear resistance, and radial / latitudinal elastic recovery rate of Examples 4-5 are significantly worse than those of Examples 1-3 and Example 6, and the corresponding test results of Example 7 are significantly better than those of Examples 4-5, but worse than those of Examples 1-3 and Example 6, indicating that the sodium alginate molecular chain contains a large number of carboxyl groups and hydroxyl groups, which are easy to form a gel network, can cover the carbon nanotube-titanium dioxide nanowire structure, improve the tensile strength and toughness of the carbon nanotube composite titanium dioxide nanowire, and then mix with bamboo charcoal fiber to improve the corresponding properties of the bamboo charcoal fiber, thereby improving the comprehensive performance of the fabric.

[0074] The preparation methods of tea polyphenol composite chitosan in Examples 8-9 do not add silicon dioxide and hydroxypropyl starch respectively. In Examples 10-11, the mass ratio of chitosan, silicon dioxide and hydroxypropyl starch is changed. It can be seen from Table 1 that the test results of radial / latitudinal breaking strength, wear resistance and radial / latitudinal elastic recovery of Examples 8-9 are significantly worse than those of Examples 1-3 and Example 10, and the corresponding test results of Example 11 are significantly better than those of Examples 8-9, but worse than those of Examples 1-3 and Example 10, indicating that silicon dioxide has excellent mechanical properties and wear resistance, chitosan has excellent film-forming properties, hydroxypropyl starch has excellent adhesion, SiO2 is uniformly dispersed in the chitosan matrix, which improves the tensile strength of the material, and the hydroxyl groups of hydroxypropyl starch form a hydrogen bond network with the amino groups of chitosan, which enhances the intermolecular force, reduces crack propagation, and improves the toughness and impact resistance of the material. It is subsequently applied to bamboo charcoal fiber to improve the corresponding properties of bamboo charcoal fiber.

[0075] The embodiments are only illustrative of the present application, and are not intended to limit the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A supercritical lightweight fabric woven from warp and weft, characterized in that: The invention adopts supercritical polymer foamed fiber as warp and bamboo charcoal fiber as weft, and the preparation method of the bamboo charcoal fiber comprises the following steps: dispersing the bamboo charcoal fiber in a salicylic acid solution, stirring for 4-6 minutes, washing with water, and then dispersing the bamboo charcoal fiber in a sodium carbonate solution, stirring for 3-5 minutes, washing with water, and then dispersing the bamboo charcoal fiber in deionized water, adding carbon nanotube composite titanium dioxide nanowire and tea polyphenol composite chitosan, stirring at a temperature of 60-65°C for 1-2 hours, and drying to obtain the bamboo charcoal fiber.

2. The supercritical lightweight fabric according to claim 1, characterized in that: The mass ratio of the bamboo charcoal fiber, the carbon nanotube composite titanium dioxide nanowire and the tea polyphenol composite chitosan is 1:0.6-0.7:0.2-0.

3.

3. The supercritical lightweight fabric according to claim 1, characterized in that: The method for preparing the carbon nanotube composite titanium dioxide nanowires comprises the following steps: Titanium dioxide nanoparticles, carbon nanotubes, and sodium dodecylbenzenesulfonate are dispersed in deionized water, ultrasonicated for 30-35 minutes, filtered, added to a sodium hydroxide solution, and hydrothermally reacted at 120-130°C for 5-6 hours. After the reaction is completed, centrifugation is performed, and the solution is repeatedly washed with dilute hydrochloric acid and water until neutral. After freeze-drying, the solution is calcined at 500-510°C in a nitrogen atmosphere for 2-3 hours to obtain carbon nanotube-titanium dioxide nanowires. The carbon nanotube-titanium dioxide nanowires are dispersed in deionized water, polyvinyl pyrrolidone and sodium alginate are added, stirred at a temperature of 80-85° C. for 1-2 hours, and dried to obtain the carbon nanotube-titanium dioxide composite nanowires.

4. The supercritical lightweight fabric according to claim 3, characterized in that: The mass ratio of the titanium dioxide nanoparticles, carbon nanotubes and sodium alginate is 1:0.6-0.7:0.2-0.

3.

5. The supercritical lightweight fabric according to claim 1, characterized in that: The preparation method of the tea polyphenol-chitosan composite comprises the following steps: dispersing chitosan in an acetic acid solution, adding tea polyphenol, and stirring at room temperature for 25-30 minutes to obtain a mixed solution; Disperse hydroxypropyl starch in deionized water, stir evenly at a temperature of 50-55°C, add silicon dioxide and 3-aminopropyltriethoxysilane, continue stirring for 1-2 hours, and dry to obtain a mixture; The mixture is added to the mixed solution, stirred at a temperature of 60-65° C. for 2-3 hours, and dried to obtain tea polyphenol composite chitosan.

6. The supercritical lightweight fabric according to claim 5, characterized in that: The mass ratio of the chitosan, silicon dioxide and hydroxypropyl starch is 1:0.4-0.5:0.1-0.

2.

7. The supercritical lightweight fabric according to claim 1, characterized in that: The preparation method of the supercritical polymer foamed fiber comprises the following steps: Thermoplastic elastomer, EVA, talc, epoxy chain extender and hindered phenol antioxidant are mixed, melt-extruded and dried to obtain a filament; The wire is impregnated with a supercritical fluid, and after the impregnation is completed, the air is locked at a low temperature to obtain an impregnated wire; The impregnated silk material is heated to foam, shaped, and drawn to obtain foamed fibers.

8. The supercritical lightweight fabric according to claim 7, characterized in that: The heating and foaming temperature is 220-230° C., the setting temperature is 120-130° C., and the constant speed drawing speed is 5-5.5 m / min.

9. The supercritical lightweight fabric according to claim 1, characterized in that: In the fabric, the warp density is 100-110 threads / inch and the weft density is 70-80 threads / inch.

10. The method for producing a supercritical lightweight fabric according to claim 1, characterized in that: The method comprises the following steps: twisting one or more strands of supercritical polymer foamed fibers into yarns, twisting one or more strands of bamboo charcoal fibers into wefts, and weaving the warps and wefts into supercritical lightweight fabrics using a satin weave process.

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