Preparation process of superfine denier profiled polyester yarn

Abstract

The invention belongs to the technical field of superfine polyester yarn, and particularly discloses a preparation process of superfine denier special-shaped polyester yarn. Comprising the following steps: (1) mixing polyester chips, modified nano bentonite, polydimethylsiloxane, nano zirconium oxide, maleic anhydride grafted polyethylene, modified pottery clay and polyethylene wax powder, stirring at 80-85 DEG C for 30-35 minutes, melting at 240-280 DEG C to obtain a melt, and spinning to obtain cellosilk; (2) cooling and solidifying the cellosilk at the temperature of 20-22 DEG C through cross air blowing to obtain cooled cellosilk; and (3) oiling the cooled cellosilk, and coiling and forming to obtain the superfine denier profiled polyester yarn. The prepared superfine denier special-shaped polyester yarn has good strength and wear resistance, fibers are not prone to breakage in the spinning process, and the quality and durability of the fibers are guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of superfine polyester filaments, and particularly to a preparation process of superfine denier profiled polyester filaments. Background Art

[0002] Superfine denier profiled polyester filaments are polyester filaments with superfine denier and profiled cross-sections. Superfine denier fibers refer to fibers with a single filament fineness below 0.55 dtex, and profiled polyester filaments refer to polyester filaments with a cross-sectional shape other than circular. Common cross-sectional shapes include I-shaped, triangular, cross-shaped, three-leaf-shaped, etc. Superfine denier profiled polyester filaments combine the characteristics of superfine denier fibers and profiled fibers and have excellent physical and chemical properties.

[0003] The commonly used preparation method of superfine denier profiled polyester filaments uses POY raw filaments as raw materials, first forms a pre-network, passes through the first feed roller and the first texturing hot box, is cooled by ring blowing, false twist texturing, then passes through the second feed roller and the second setting hot box, and finally is set and overfed, oiled, and wound into shape to obtain the product. The prepared superfine denier profiled polyester filaments have super hygroscopicity, softness, breathability, and better comfort, and are widely used in high-grade clothing fabrics, home textile products, industrial fabrics, and other fields. Due to the fineness of the polyester filaments and the special cross-section, they are prone to breakage during the spinning process, which affects the product quality and production efficiency, and subsequently causes the fabric to be easily damaged during use. Summary of the Invention

[0004] In order to improve the problem that polyester filaments are prone to breakage, the present application provides a preparation process of superfine denier profiled polyester filaments.

[0005] The present application provides a preparation process of superfine denier profiled polyester filaments, adopting the following technical scheme: A preparation process of superfine denier profiled polyester filaments includes the following steps: (1) Mix polyester chips, modified nano-bentonite, polydimethylsiloxane, nano-zirconia, maleic anhydride grafted polyethylene, modified clay, and polyethylene wax powder, stir at 80 - 85 °C for 30 - 35 min, melt at 240 - 280 °C to obtain a melt, and spin at a temperature of 270 - 280 °C to obtain fiber filaments; (2) Cool and solidify the fiber filaments obtained in step (1) by side blowing at a temperature of 20 - 22 °C to obtain cooled fiber filaments; (3) Oil the cooled fiber filaments obtained in step (2), wind and form them to obtain superfine denier profiled polyester filaments.

[0006] By adopting the above technical solution, polyester chips, modified nano-bentonite, polydimethylsiloxane, nano-zirconium oxide, maleic anhydride grafted polyethylene, modified clay, and polyethylene wax powder are mixed for spinning to obtain fiber filaments. Among them, polyester chips serve as the main polymer raw material, providing the basic properties of the fiber, having high strength, high modulus, excellent fiber-forming properties, wear resistance, and dimensional stability. The modified nano-bentonite has good dispersibility and stability, enabling the uniform dispersion of each component, and also has excellent mechanical properties and lubricating effects, capable of filling the molecular gaps in polyester chips, increasing the intermolecular interaction force, and improving the strength and wear resistance of polyester filaments.

[0007] Polydimethylsiloxane has good lubricity, softness, and high-temperature resistance, which can improve the flexibility and elasticity of polyester filaments, making them easier to form during the spinning process; nano-zirconium oxide has high hardness, wear resistance, tensile strength, and thermal stability, which can significantly improve the hardness, thermal stability, and wear resistance of polyester filaments, making them not easily break during use. Maleic anhydride grafted polyethylene serves as a compatibilizer to improve the compatibility between polyester chips and other additives, ensuring the uniform distribution of each component in the fiber. Modified clay has good adsorption and stability, which can enhance the mechanical properties of polyester filaments and maintain their performance and dimensional stability in high-temperature environments. Polyethylene wax powder has good lubricity and processing properties, reducing the friction and wear of polyester filaments during processing, improving the gloss and smoothness of the fiber, and being able to improve the processing properties of polyester filaments.

[0008] The fiber filaments are cooled by side blowing air, enabling them to solidify quickly, which helps with the uniform cooling and shaping of the fiber filaments. Then, oiling is carried out, applying an appropriate amount of sizing agent on the surface of the fiber filaments to improve the lubricity and antistatic properties of the fiber, and coiling and forming to obtain superfine denier profiled polyester filaments.

[0009] Preferably, the preparation method of the modified nano-bentonite includes the following steps: (1) Immerse the bentonite in a sodium hydroxide solution, stir for 1 - 2 h, wash with water, and calcine at a temperature of 430 - 435 °C for 20 - 25 min to obtain pretreated bentonite; (2) Disperse the modified wood ash in deionized water, add the pretreated bentonite from step (1), ultrasonicate for 2 - 3 h, and filter to obtain a premix; (3) Spray nano-silica sol on the surface of the premix from step (2), stir evenly, and dry to obtain the modified nano-bentonite.

[0010] By adopting the above technical solution, bentonite is first pretreated by soaking it in a sodium hydroxide solution. The alkali treatment of bentonite with sodium hydroxide helps to improve its interlayer structure and dispersibility, remove impurities in the bentonite, and improve its purity and activity. Calcination further helps to remove moisture and organic substances in the bentonite, while improving its thermal stability and structural stability.

[0011] The modified wood ash is dispersed in deionized water, and the pretreated bentonite is added. The modified wood ash has good adsorption, reactivity and mechanical properties, can be loaded on the surface of bentonite particles, increase the mechanical properties of bentonite, and is subsequently applied to polyester filaments to fill the pores of the polyester filaments, increasing the mechanical properties and wear resistance of the polyester filaments.

[0012] Nanosilica sol has excellent viscosity, dispersibility and stability. Spraying it on the surface of the premix makes the modified wood ash firmly adhere to the surface of bentonite, increasing the modification stability of bentonite, which helps to further improve the mechanical properties of bentonite. Subsequently applied to polyester filaments, it can more effectively fill the tiny voids of polyester fibers, enhance the bonding force inside the fibers, and increase the wear resistance, thermal stability and mechanical properties of polyester filaments.

[0013] Preferably, the mass ratio of the bentonite, modified wood ash and nanosilica sol is 1:0.7 - 0.8:0.3 - 0.4.

[0014] By adopting the above technical solution, the mass ratio between the bentonite, modified wood ash and nanosilica sol is further defined. The obtained modified bentonite has better comprehensive properties. Bentonite has good adsorption performance and expansibility, can adsorb impurities and moisture on the surface of fibers, thereby improving the surface quality and dimensional stability of fibers. The modified wood ash has excellent mechanical properties and wear resistance, can adsorb on the surface and pores of bentonite, increasing the corresponding properties of bentonite. Nanosilica sol has certain adhesiveness and dispersibility, making the modified wood ash tightly adhere to the surface of bentonite, increasing the mechanical properties, wear resistance and high-temperature resistance of bentonite. Subsequently applied to polyester filaments, the modified bentonite can be embedded in the gaps between polyester molecules, subsequently increasing the strength, wear resistance and thermal stability of polyester filaments, and at the same time can also improve the surface quality and dimensional stability of fibers.

[0015] Preferably, the preparation method of the modified wood ash includes the following steps: Dispersing tree ash in hydrogen peroxide solution and soaking for 3 - 4 h, washing with water, drying, then dispersing in deionized water, adding calcium lignosulfonate, metal-organic framework material, sodium lauryl polyoxyethylene ether sulfate and polyvinyl alcohol, stirring at a temperature of 60 - 65 °C for 1 - 2 h, drying, and grinding to obtain a powder with a size of 0.5 - 0.7 μm, which is the modified wood ash.

[0016] By adopting the above technical solution, tree ash is treated with hydrogen peroxide to remove impurities therein and change its chemical properties, so that the tree ash has good abrasion resistance and adsorption properties, which helps the tree ash to be more evenly dispersed in deionized water; calcium lignosulfonate, metal-organic framework material, sodium lauryl polyoxyethylene ether sulfate and polyvinyl alcohol are added. Calcium lignosulfonate has good dispersion properties and adhesion properties, enabling better dispersion of other components with the tree ash and improving the uniformity and stability of the system.

[0017] The metal-organic framework material has a high specific surface area and a porous structure, and can be loaded on the surface and pores of the tree ash, increasing the mechanical properties, abrasion resistance and adsorption properties of the tree ash. Sodium lauryl polyoxyethylene ether sulfate has good wetting and emulsifying properties, and cooperates synergistically with calcium lignosulfonate to make the tree ash and the metal-organic framework material disperse evenly. Polyvinyl alcohol has good film-forming and bonding properties, enabling the metal-organic framework material to stably adhere to the surface of the tree ash, increasing the stability of the performance modification of the modified wood ash, and making the modified wood ash have good adsorption properties, stability, abrasion resistance and mechanical properties, and being subsequently applied to bentonite to increase the corresponding properties of bentonite.

[0018] Preferably, the preparation method of the modified clay comprises the following steps: (1) Disperse clay and bauxite in hydrogen peroxide, soak for 20 - 24 min, wash with water, then disperse in deionized water, add calcium carbonate and sodium lauryl sulfate, stir evenly, and dry to obtain a clay mixture; (2) Disperse the modified polylactic acid fiber in deionized water, add the clay mixture obtained in step (1), stir at a temperature of 75 - 80 °C for 1 - 2 h, then add gum arabic and nano-zinc oxide, and continue to stir for 2 - 3 h, and dry to obtain the modified clay.

[0019] By adopting the above technical solution, treating clay and bauxite with hydrogen peroxide to remove organic impurities in the clay and bauxite, oxidizing the surfaces of the clay and bauxite, increasing the specific surface area and dispersibility of the clay and bauxite, and increasing the interaction of the subsequent clay and bauxite with other components; adding calcium carbonate and sodium lauryl sulfate, calcium carbonate can fill the pores of the clay and bauxite, increasing the mechanical properties of the clay and bauxite, and sodium lauryl sulfate helps to improve the dispersibility and stability of the mixture, making each component mix evenly.

[0020] The modified polylactic acid fiber has good tear resistance and toughness, can adsorb on the particle surface and pores of the clay mixture, increasing the toughness, thermal stability and mechanical properties of the clay mixture. Arabic gum has a certain viscosity, enabling the modified polylactic acid fiber to adhere stably in the structure of the clay composition, increasing the structural strength and toughness of the clay. Nano-zinc oxide has good mechanical properties and ultraviolet resistance, can be embedded in the structures of the clay mixture and Arabic gum, further improving the comprehensive properties of the modified clay, and is subsequently applied to polyester filaments to increase the high-temperature resistance, mechanical properties, heat resistance and wear resistance of the polyester filaments.

[0021] Preferably, the mass ratio of the clay, modified polylactic acid fiber and Arabic gum is 1:0.5 - 0.6:0.1 - 0.2.

[0022] By adopting the above technical solution, further limiting the mass ratio of the clay, modified polylactic acid fiber and Arabic gum within a certain range, the obtained modified clay has good comprehensive properties. The clay has a large specific surface area, heat resistance and wear resistance. The modified polylactic acid fiber has good flexibility, tensile strength and comfort, and can improve the flexibility and wear resistance of polyester filaments. Arabic gum has good adhesiveness and film-forming properties and is used as an adhesive to enhance the binding force between the clay and the modified polylactic acid fiber, enabling the modified polylactic acid fiber to adhere stably in the clay structure and improving the overall performance of the polyester filaments. There is a synergistic effect among the clay, modified polylactic acid fiber and Arabic gum, enhancing the mechanical properties, wear resistance, heat resistance and thermal stability of the polyester filaments, making them more durable.

[0023] Preferably, the preparation method of the modified polylactic acid fiber includes the following steps: dispersing the polylactic acid fiber in a hydrochloric acid solution, soaking for 1 - 2 h, washing with water, then impregnating in a mixed solution for 3 - 5 times, drying after each impregnation, and the impregnation time is 20 - 25 s to obtain the modified polylactic acid fiber; The raw materials of the mixed solution include: cellulose diacetate, chitosan, deionized water, citric acid, starch, Al 2 O 3 / Fe 2 O 3 composite nanoparticles.

[0024] By adopting the above technical solution, hydrochloric acid treats the surface of the polylactic acid fiber, removes the impurities on the surface of the polylactic acid fiber, increases the specific surface area of the polylactic acid fiber, and increases the pore structure on the surface of the polylactic acid fiber, which is helpful for subsequent impregnation treatment.

[0025] In the mixed solution, cellulose diacetate has good flexibility, hygroscopicity and mechanical strength. Loaded on the surface of polylactic acid fiber, it increases the mechanical strength and wear resistance of the surface of polylactic acid fiber. Chitosan has excellent antibacterial properties and viscosity, enabling cellulose diacetate to be loaded on the surface of polylactic acid fiber. Functional groups such as amino and hydroxyl groups in chitosan molecules can interact with functional groups such as hydroxyl groups in starch molecules to form stronger chemical bonds or hydrogen bonds, thereby further enhancing the adhesion of the mixed system.

[0026] Al 2 O 3 / Fe 2 O 3 The composite nanoparticles have very high hardness and wear resistance, can adhere to the surface of polylactic acid fiber, improve the mechanical properties (such as tensile strength and modulus), wear resistance and thermal stability of polylactic acid fiber. The adhesive substance formed by starch and chitosan enables Al 2 O 3 / Fe 2 O 3 The composite nanoparticles adhere to the surface of polylactic acid fiber, increasing the mechanical properties, wear resistance and thermal stability of polylactic acid fiber, and then improving the corresponding properties of clay, and subsequently improving the comprehensive properties of polyester filaments.

[0027] Preferably, in step (1), the denier of the single filament of the spinning is ≤0.5 dtex.

[0028] By adopting the above technical solution, the denier of the single filament of the spinning is limited to ≤0.5 dtex to obtain superfine denier polyester filaments. The obtained polyester filaments have good adsorption, filtration and air permeability, and subsequently improve the softness and comfort of the fabric.

[0029] Preferably, the shape of the spinneret is selected from one of star, cross, oval, Y-shaped, dumbbell-shaped.

[0030] By adopting the above technical solution, the shape of the spinneret is limited, and the obtained profiled polyester filaments have cross-sections of different shapes, endowing the fibers with unique physical and chemical properties, enabling the fibers to be applied in different fields.

[0031] Preferably, in step (1), the temperatures of each zone of the melt extrusion are: zone 1: 240 - 250 °C, zone 2: 255 - 265 °C, zone 3: 260 - 270 °C, zone 4: 260 - 275 °C, zone 5: 265 - 280 °C, zone 6: 265 - 280 °C, and the screw pressure is 90 - 100 kg / Cm 2 。

[0032] By adopting the above technical solution, the temperatures of each extrusion zone are further limited, so that the melt extruded has good functions and fluidity, which is conducive to subsequent spinning.

[0033] In summary, the present application has the following beneficial effects: 1. The modified nano-bentonite in the present application has good dispersibility and stability, enabling the uniform dispersion of each component. It also has excellent mechanical properties and lubricating effects, can fill in the molecular gaps of polyester chips, increase the intermolecular interaction force, and improve the strength and wear resistance of polyester filaments.

[0034] 2. The modified clay in the present application has good adsorption and stability, can enhance the mechanical properties of polyester filaments, and enable them to maintain performance and dimensional stability in high-temperature environments.

[0035] 3. The ultrafine denier profiled polyester filaments obtained in the present application have good mechanical properties and wear resistance, and subsequently extend the service life of the polyester filaments. Specific Embodiments

[0036] The following further elaborates on the present application in conjunction with examples.

[0037] The raw materials used in the examples and comparative examples can all be obtained commercially.

[0038] Preparation Example of Modified Nano-Bentonite Preparation Example 1-1 The preparation method of modified nano-bentonite includes the following steps: (1) Soak 40 kg of bentonite in 50 L of sodium hydroxide solution with a mass fraction of 12%, stir for 1.5 h, wash with water, and calcine at a temperature of 435 °C for 22 min to obtain pretreated bentonite; (2) Disperse the modified wood ash in 120 L of deionized water, add the pretreated bentonite from step (1), sonicate for 3 h, filter to obtain a premix; (3) Spray nano-silica sol on the surface of the premix from step (2), stir evenly, and dry to obtain modified nano-bentonite.

[0039] The nano-silica sol is purchased from Yuanyang County Lutong Refractory Materials Co., Ltd.

[0040] The mass ratio of bentonite, modified wood ash, and nano-silica sol is 1:0.8:0.3.

[0041] The preparation method of modified wood ash includes the following steps: Disperse 60 kg of tree ash in 90 L of hydrogen peroxide solution with a mass fraction of 8% and soak for 3.5 h, wash with water, dry, then disperse in 100 L of deionized water, add 10 kg of calcium lignosulfonate, 30 kg of metal-organic framework material, 8 kg of sodium lauryl polyoxyethylene ether sulfate, and 15 kg of polyvinyl alcohol, stir at a temperature of 65 °C for 2 h, dry, and grind to obtain a powder with a size of 0.5 - 0.7 μm, which is the modified wood ash.

[0042] Preparation Example 1-2 It is different from Preparation Example 1-1 in that in step (2), modified wood ash is not added.

[0043] Preparation Example 1-3 It is different from Preparation Example 1-1 in that in step (3), nano-silica sol is not added.

[0044] Preparation Example 1-4 It is different from Preparation Example 1-1 in that the mass ratio of bentonite, modified wood ash and nano-silica sol is 1:0.7:0.4.

[0045] Preparation Example 1-5 It is different from Preparation Example 1-1 in that the mass ratio of bentonite, modified wood ash and nano-silica sol is 1:0.1:0.8.

[0046] Preparation Example 1-6 It is different from Preparation Example 1-1 in that in the preparation method of modified wood ash, metal-organic framework material is not added.

[0047] Preparation Example 1-7 It is different from Preparation Example 1-1 in that in the preparation method of modified wood ash, polyvinyl alcohol is not added.

[0048] Preparation Examples of Modified Kaolin Preparation Example 2-1 The preparation method of modified kaolin includes the following steps: (1) Disperse 20 kg of kaolin and 10 kg of bauxite in 40 L of hydrogen peroxide solution with a mass fraction of 4%, soak for 23 min, wash with water, then disperse in 50 L of deionized water, add 5 kg of calcium carbonate and 3 kg of sodium lauryl sulfate, stir evenly, and dry to obtain a kaolin mixture; (2) Disperse the modified polylactic acid fiber in 100 L of deionized water, add the kaolin mixture obtained in step (1), stir at 77 °C for 1.5 h, then add gum arabic and 1.5 kg of nano-zinc oxide, continue to stir for 2.5 h, and dry to obtain modified kaolin.

[0049] The mass ratio of kaolin, modified polylactic acid fiber and gum arabic is 1:0.5:0.2.

[0050] The preparation method of the modified polylactic acid fiber includes the following steps: Disperse 20 kg of polylactic acid fiber in 30 L of hydrochloric acid solution with a mass fraction of 7%, soak for 1.5 h, wash with water, then immerse in the mixed solution, immerse 4 times, dry after each immersion, and the immersion time is 23 s to obtain the modified polylactic acid fiber; The raw materials of the mixed solution include: 4kg cellulose diacetate, 10kg chitosan, 70L deionized water, 8g citric acid, 5kg starch, 8kg Al 2 O 3 / Fe 2 O 3 Composite nanoparticles.

[0051] Al 2 O 3 / Fe 2 O 3 Composite nanoparticles were purchased from Xi'an Qiyue Biotechnology Co., Ltd.

[0052] Preparation Example 2-2 The difference from Preparation Example 2-1 is that in step (2), no modified polylactic acid fiber is added.

[0053] Preparation Example 2-3 The difference from Preparation Example 2-1 is that in step (2), gum arabic is not added.

[0054] Preparation Example 2-4 The difference from Preparation Example 2-1 is that the mass ratio of clay, modified polylactic acid fiber and gum arabic is 1:0.6:0.1.

[0055] Preparation Example 2-5 The difference from Preparation Example 2-1 is that the mass ratio of clay, modified polylactic acid fiber and gum arabic is 1:0.1:0.9.

[0056] Preparation Example 2-6 The difference from Preparation Example 2-1 is that in the preparation method of the modified polylactic acid fiber, no Al is added. 2 O 3 / Fe 2 O 3 Composite nanoparticles.

[0057] Preparation Example 2-7 The difference from Preparation Example 2-1 is that chitosan is not added in the preparation method of the modified polylactic acid fiber. Example

[0058] Example 1 A preparation process of ultra-fine denier special-shaped polyester yarn comprises the following steps: (1) 110 kg of polyester chips, 30 kg of modified nano-bentonite, 10 kg of polydimethylsiloxane, 14 kg of nano-zirconium oxide, 5 kg of maleic anhydride grafted polyethylene, 24 kg of modified clay, and 7 kg of polyethylene wax powder were mixed, stirred at 85° C. for 30 min, melted at 280° C. to obtain a melt, and spun through a spinneret at a temperature of 270° C. to obtain fiber filaments; (2) The fiber filaments obtained in step (1) are cooled and solidified by side blowing at a temperature of 22°C, with a relative humidity of 75% and a wind speed of 0.28 m / s to obtain cooled fiber filaments; (3) The cooled fiber filaments in step (2) are oiled with a polyester finishing agent. The weight concentration of the polyester finishing agent is 10%, the rotational speed of the oil roller is 6 revolutions per minute, and winding and forming are carried out to obtain superfine denier profiled polyester filaments.

[0059] The polyester finishing agent is purchased from Zhenhua Synthetic Fiber Auxiliary Factory in Nanyang City.

[0060] In step (1), the single fiber fineness of the spinning is 0.5 dtex.

[0061] The shape of the spinneret is selected from a star shape.

[0062] In step (1), the temperatures of each zone for melt extrusion are: zone 1 at 250°C, zone 2 at 265°C, zone 3 at 270°C, zone 4 at 275°C, zone 5 at 280°C, zone 6 at 280°C, and the screw pressure is 100 kg / Cm 2 。

[0063] The modified nano-bentonite is prepared by Preparation Example 1-1; the modified clay is prepared by Preparation Example 2-1.

[0064] Example 2 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 and includes the following steps: (1) 100 parts of polyester chips, 28 kg of modified nano-bentonite, 8 kg of polydimethylsiloxane, 16 kg of nano-zirconia, 4 kg of maleic anhydride grafted polyethylene, 25 kg of modified clay, and 5 kg of polyethylene wax powder are mixed, stirred at 80°C for 35 min, melted at 240°C to obtain a melt, and spun through a spinneret at a temperature of 280°C to obtain fiber filaments; (2) The fiber filaments obtained in step (1) are cooled and solidified by side blowing at a temperature of 20°C, with a relative humidity of 70% and a wind speed of 0.25 m / s to obtain cooled fiber filaments; (3) The cooled fiber filaments in step (2) are oiled with a polyester finishing agent. The weight concentration of the polyester finishing agent is 18%, the rotational speed of the oil roller is 4 revolutions per minute, and winding and forming are carried out to obtain superfine denier profiled polyester filaments.

[0065] In step (1), the single fiber fineness of the spinning is 0.4 dtex.

[0066] The shape of the spinneret is selected from a cross shape.

[0067] In step (1), the temperatures of each zone for melt extrusion are: Zone 1: 240 °C, Zone 2: 255 °C, Zone 3: 260 °C, Zone 4: 260 °C, Zone 5: 265 °C, Zone 6: 265 °C, and the screw pressure is 90 kg / Cm 2 .

[0068] Example 3 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified nano-bentonite is prepared by Preparation Example 1-2.

[0069] Example 4 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified nano-bentonite is prepared by Preparation Example 1-3.

[0070] Example 5 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified nano-bentonite is prepared by Preparation Example 1-4.

[0071] Example 6 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified nano-bentonite is prepared by Preparation Example 1-5.

[0072] Example 7 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified nano-bentonite is prepared by Preparation Example 1-6.

[0073] Example 8 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified nano-bentonite is prepared by Preparation Example 1-7.

[0074] Example 9 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified clay is prepared by Preparation Example 2-2.

[0075] Example 10 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified clay is prepared by Preparation Example 2-3.

[0076] Example 11 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified clay is prepared by Preparation Example 2-4.

[0077] Example 12 A preparation process for superfine denier profiled polyester filaments, which is different from Example 1 in that the modified clay is prepared by Preparation Example 2-5.

[0078] Example 13 A preparation process of superfine denier profiled polyester filaments, which is different from that of Example 1 in that the modified clay is prepared by Preparation Examples 2-6.

[0079] Example 14 A preparation process of superfine denier profiled polyester filaments, which is different from that of Example 1 in that the modified clay is prepared by Preparation Examples 2-7.

[0080] Comparative Example Comparative Example 1 A preparation process of superfine denier profiled polyester filaments, which is different from that of Example 1 in that no modified bentonite is added.

[0081] Comparative Example 2 A preparation process of superfine denier profiled polyester filaments, which is different from that of Example 1 in that the modified bentonite is replaced with an equal amount of bentonite.

[0082] Comparative Example 3 A preparation process of superfine denier profiled polyester filaments, which is different from that of Example 1 in that no modified clay is added.

[0083] Comparative Example 4 A preparation process of superfine denier profiled polyester filaments, which is different from that of Example 1 in that the modified clay is replaced with an equal amount of clay.

[0084] Performance detection test The performance of the preparation processes of the superfine denier profiled polyester filaments prepared in Examples 1-14 and Comparative Examples 1-4 was tested; The polyester filaments prepared in the examples and comparative examples were made into fibers with a fineness of 3.4 dtex, and the breaking strength and breaking elongation of the polyester filaments were detected according to GB / T14460-2015.

[0085] The polyester filaments prepared in the examples and comparative examples were used to weave fabrics on a loom, and the abrasion resistance of the fabrics was detected according to GB / T21196.3-2007 "Determination of fabric abrasion resistance by Martindale method - Part 3: Determination of mass loss", and the abrasion resistance index Ai = n / Δm was measured, where n refers to the total number of friction times and Δm refers to the mass loss under the total number of friction times, with the unit of milligram; the color fastness to soaping of textiles was tested according to GB / T 3921-2008.

[0086] Broken wire experiment: On a single set of equipment, continuous running samples were carried out for 24 hours, and the number of broken wires during the operation of the equipment was recorded; the test results are shown in Table 1.

[0087] Table 1 Test data of examples and comparative examples As can be seen from Table 1, the preparation process of the superfine denier profiled polyester filaments prepared in Examples 1-2 of this application has good mechanical properties and abrasion resistance. Among them, the breaking strength of Example 1 is 6.8 cN / dtex, the elongation at break is 34.5%, there is no wire breakage phenomenon, the abrasion resistance index is 1.02 mg / time, and the color fastness to washing is 5. It shows that the prepared superfine denier profiled polyester filaments have good mechanical properties and mechanical strength, and various components cooperate with each other to jointly improve the abrasion resistance and tensile properties of the polyester filaments, thereby making the polyester filaments not easy to break during the spinning process.

[0088] In the preparation methods of modified nano-bentonite in Examples 3-4, modified wood ash and nano-silica sol are not added respectively. In Examples 5-6, the mass ratios of bentonite, modified wood ash and nano-silica sol are changed. As can be seen from Table 1, the test results of the breaking strength, elongation at break, number of wire breaks, abrasion resistance index and color fastness to washing in Examples 3-4 are significantly worse than those in Examples 1-2 and Example 5, while the corresponding performance tests in Example 6 are better than those in Examples 3-4, but worse than those in Examples 1-2 and Example 5. It shows that modified wood ash has excellent mechanical properties and abrasion resistance, can be adsorbed on the surface and pores of bentonite, and increases the corresponding properties of bentonite. Nano-silica sol has certain adhesiveness and dispersibility, making the modified wood ash tightly adhere to the surface of bentonite, increasing the mechanical properties, abrasion resistance and high temperature resistance of bentonite. Subsequently, when applied to polyester filaments, it increases the strength, abrasion resistance and thermal stability of the polyester filaments.

[0089] In the preparation methods of modified wood ash in Examples 7-8, metal-organic framework materials and polyvinyl alcohol are not added respectively. As can be seen from Table 1, the test results of the breaking strength, elongation at break, number of wire breaks, abrasion resistance index and color fastness to washing in Examples 7-8 are significantly better than those in Example 3, but worse than those in Examples 1-2. It shows that metal-organic framework materials have a high specific surface area and porous structure, can be loaded on the surface and pores of tree ash, and increase the mechanical properties, abrasion resistance and adsorption properties of tree ash. Polyvinyl alcohol has good film-forming and adhesive properties, making the metal-organic framework materials stably adhere to the surface of tree ash, increasing the stability of the performance modification of modified wood ash, and making the modified wood ash have good adsorption, stability, abrasion resistance and mechanical properties. Subsequently, when applied to bentonite, it increases the corresponding properties of bentonite.

[0090] In the preparation methods of modified clay in Examples 9 - 10, modified polylactic acid fibers and arabic gum were not added respectively. In Examples 11 - 12, the mass ratios of clay, modified polylactic acid fibers and arabic gum were changed. As can be seen from Table 1, the test results of breaking strength, elongation at break, number of broken filaments, wear resistance index and color fastness to washing in Examples 9 - 10 were significantly worse than those in Examples 1 - 2 and Example 11. The corresponding performance tests in Example 12 were better than those in Examples 9 - 10, but worse than those in Examples 1 - 2 and Example 11. It shows that clay has a large specific surface area, heat resistance and wear resistance, modified polylactic acid fibers have good flexibility, tensile strength and comfort, which can improve the flexibility and wear resistance of polyester filaments. Arabic gum has good adhesiveness and film-forming property, which can enhance the binding force between clay and modified polylactic acid fibers, making the modified polylactic acid fibers stably bonded in the clay structure, improving the overall performance of polyester filaments. There is a synergistic effect among clay, modified polylactic acid fibers and arabic gum, enhancing the mechanical properties, wear resistance, heat resistance and thermal stability of polyester filaments, making them more durable.

[0091] In the preparation methods of modified polylactic acid fibers in Examples 13 - 14, Al 2 O 3 / Fe 2 O 3 composite nanoparticles and chitosan were not added respectively. As can be seen from Table 1, the test results of breaking strength, elongation at break, number of broken filaments, wear resistance index and color fastness to washing in Examples 13 - 14 were significantly better than those in Example 9, but worse than those in Examples 1 - 2. It shows that Al 2 O 3 / Fe 2 O 3 composite nanoparticles have very high hardness and wear resistance, can adhere to the surface of polylactic acid fibers, improving the mechanical properties (such as tensile strength and modulus), wear resistance and thermal stability of polylactic acid fibers. Chitosan enables Al 2 O 3 / Fe 2 O 3 composite nanoparticles to adhere to the surface of polylactic acid fibers, increasing the mechanical properties, wear resistance and thermal stability of polylactic acid fibers, and then improving the corresponding properties of clay, and subsequently improving the comprehensive performance of polyester filaments.

[0092] In Comparative Example 1 and Comparative Example 3, modified bentonite and modified kaolin were not added respectively. It can be seen from Table 1 that the test results of the breaking strength, elongation at break, number of broken filaments, wear resistance index, and color fastness to washing of Comparative Example 1 and Comparative Example 3 are significantly worse than those of Examples 1-2, indicating that the modified nano-bentonite has good dispersibility and stability, enabling the uniform dispersion of each component, and also has excellent mechanical properties and lubricating effects, which can fill the molecular gaps of polyester chips, increase the intermolecular interaction force, and improve the strength and wear resistance of polyester filaments; the modified kaolin has good adsorption, mechanical properties and stability, which can enhance the mechanical properties of polyester filaments and keep their performance and dimensional stability in high-temperature environments.

[0093] In Comparative Example 2 and Comparative Example 4, the modified bentonite was replaced with an equal amount of bentonite and the modified kaolin was replaced with an equal amount of kaolin respectively. It can be seen from Table 1 that the test results of the breaking strength, elongation at break, number of broken filaments, wear resistance index, and color fastness to washing of Comparative Example 2 are significantly worse than those of Examples 1-2, but better than those of Comparative Example 1 and Comparative Example 3, indicating that the modified bentonite and modified kaolin of the present application have good mechanical properties, wear resistance and stability, thereby improving the mechanical properties of polyester filaments and keeping the polyester filaments from being easily broken during the spinning process.

[0094] This specific embodiment is only an interpretation of the present application and does not limit the present application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A process for preparing ultra-fine denier special-shaped polyester yarn, characterized in that: The steps include: (1) Mixing polyester chips, modified nano-bentonite, polydimethylsiloxane, nano-zirconium oxide, maleic anhydride grafted polyethylene, modified clay, and polyethylene wax powder, stirring at 80-85° C. for 30-35 minutes, melting at 240-280° C. to obtain a melt, and spinning at a temperature of 270-280° C. to obtain fiber filaments; (2) cooling and solidifying the fiber filaments obtained in step (1) at a temperature of 20-22° C. by side-blowing air to obtain cooled fiber filaments; (3) The cooled fiber filaments in step (2) are oiled and rolled into shape to obtain ultra-fine denier shaped polyester filaments.

2. The process for preparing the ultra-fine denier shaped polyester yarn according to claim 1, characterized in that: The preparation method of the modified nano bentonite comprises the following steps: (1) Soaking bentonite in a sodium hydroxide solution, stirring for 1-2 hours, washing with water, and calcining at a temperature of 430-435°C for 20-25 minutes to obtain pretreated bentonite; (2) dispersing the modified wood ash in deionized water, adding the pretreated bentonite from step (1), ultrasonicating for 2-3 hours, and filtering to obtain a premix; (3) Spraying nano-silica sol onto the surface of the premix in step (2), stirring evenly, and drying to obtain modified nano-bentonite.

3. The process for preparing the ultra-fine denier special-shaped polyester yarn according to claim 2, characterized in that: The mass ratio of the bentonite, the modified wood ash and the nano-silica sol is 1:0.7-0.8:0.3-0.

4.

4. The process for preparing the ultra-fine denier special-shaped polyester yarn according to claim 2, characterized in that: The preparation method of the modified wood ash comprises the following steps: dispersing tree ash in hydrogen peroxide and soaking it for 3-4 hours, washing it with water, drying it, and then dispersing it in deionized water, adding calcium lignin sulfonate, metal organic framework material, sodium lauryl polyoxyethylene ether sulfate and polyvinyl alcohol, stirring it at a temperature of 60-65° C. for 1-2 hours, drying it, and grinding it to obtain a powder with a size of 0.5-0.7 μm, namely the modified wood ash.

5. The process for preparing the ultra-fine denier special-shaped polyester yarn according to claim 1, characterized in that: The preparation method of the modified clay comprises the following steps: (1) Dispersing clay and bauxite in hydrogen peroxide, soaking for 20-24 minutes, washing with water, and then dispersing in deionized water, adding calcium carbonate and sodium lauryl sulfate, stirring evenly, and drying to obtain a clay mixture; (2) Dispersing the modified polylactic acid fiber in deionized water, adding the clay mixture of step (1), stirring at a temperature of 75-80° C. for 1-2 h, then adding gum arabic and nano zinc oxide, continuing to stir for 2-3 h, and drying to obtain modified clay.

6. The process for preparing ultra-fine denier shaped polyester yarn according to claim 5, characterized in that: The mass ratio of the clay, the modified polylactic acid fiber and the gum arabic is 1:0.5-0.6:0.1-0.

2.

7. The process for preparing ultra-fine denier special-shaped polyester yarn according to claim 5, characterized in that: The preparation method of the modified polylactic acid fiber comprises the following steps: dispersing the polylactic acid fiber in a hydrochloric acid solution, soaking for 1-2 hours, washing with water, and then soaking in the mixed solution for 3-5 times, drying after each soaking, and the soaking time is 20-25 seconds to obtain the modified polylactic acid fiber; The raw materials of the mixed solution include: cellulose diacetate, chitosan, deionized water, citric acid, starch, and Al2O3 / Fe2O3 composite nanoparticles.

8. The process for preparing ultra-fine denier special-shaped polyester yarn according to claim 1, characterized in that: In step (1), the fineness of the spun single filament is ≤0.5 dtex.

9. The process for preparing ultra-fine denier special-shaped polyester yarn according to claim 1, characterized in that: The shape of the spinneret is selected from a star shape, a cross shape, an ellipse shape, a Y shape, and a dumbbell shape.

10. The process for preparing ultra-fine denier special-shaped polyester yarn according to claim 1, characterized in that: In step (1), the temperature of each zone of melt extrusion is: zone 1 240-250°C, zone 2 255-265°C, zone 3 260-270°C, zone 4 260-275°C, zone 5 265-280°C, zone 6 265-280°C, and the screw pressure is 90-100kg / cm 2 .

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