A method for producing high-elastic composite twisted yarn and moisture-absorbing quick-drying fabric

Abstract

The invention relates to the field of textile technology, and specifically discloses a production method of a high-elastic composite twisted yarn and a moisture-absorbing quick-drying fabric; the preparation method of the high-elastic composite twisted yarn comprises the following steps: S1: taking dimethyl terephthalate, ethylene glycol and sodium acetate, stirring evenly, heating and stirring to obtain an intermediate; taking the intermediate, polyethylene glycol, modified diatomaceous earth and a solvent, stirring evenly, heating, adding diisocyanate and a tin catalyst, stirring and reacting until the isocyanate group content reaches a theoretical end point, and removing the solvent by rotary evaporation to obtain a hydrophilic additive; S2: taking polyester masterbatch and a hydrophilic additive, mixing and stirring, adding them into a screw extruder for melt spinning to obtain polyester yarn; S3: taking polyester yarn and polyester staple yarn with a special cross-section, twisting and shaping to obtain a basic yarn; S4: immersing the basic yarn in a sericin solution, passing nitrogen gas, ultraviolet radiation, washing with water, and drying to obtain a high-elastic composite twisted yarn.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and specifically discloses a production method of a high-elastic composite twisted yarn and a moisture-absorbing quick-drying fabric. Background Art

[0002] Polyester is an important type of synthetic fiber with good strength and elasticity, and is widely used in clothing fabrics. However, polyester fiber macromolecules are relatively rigid and lack hydrophilic groups, resulting in poor moisture absorption and breathability, and reduced wearing comfort.

[0003] In order to meet market demand, it is necessary to prepare yarns and fabrics with good moisture absorption and quick-drying properties and high elasticity, and polyester yarns need to be modified and profiled in different forms; however, the modifications in the existing technology often make it difficult to balance the elasticity and moisture absorption and quick-drying properties of the yarns, and the problem of rough fiber feel often occurs; in summary, it is of great significance to study a production method of a high-elastic composite twisted yarn with good moisture absorption and quick-drying properties and a moisture absorption and quick-drying fabric. Summary of the invention

[0004] The purpose of the present invention is to provide a production method of a high-elastic composite twisted yarn and a moisture-absorbing quick-drying fabric to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for producing a high-elastic composite twisted yarn comprises the following steps:

[0007] Step 1: Take polyester yarn and polyester staple yarn with a mass ratio of (80-90): (10-20), twist them in opposite twist directions and with a twist of 400-800 twists / m, and shape them (shape setting at 90-100°C for 80-90 minutes) to obtain basic yarn;

[0008] Step 2: The base yarn is immersed in a sericin solution, nitrogen is introduced, ultraviolet radiation is applied, water is washed, and drying is performed to obtain a high-elastic composite twisted yarn.

[0009] More optimally, the preparation method of the polyester yarn comprises the following steps: S1: taking dimethyl terephthalate, ethylene glycol, and sodium acetate, stirring evenly, heating to 170-180°C and stirring for 4-6 hours to obtain an intermediate; taking the intermediate, polyethylene glycol, modified diatomaceous earth, and solvent (ethanol), stirring evenly, heating to 70-75°C, adding diisocyanate and tin catalyst (dibutyltin dilaurate), stirring and reacting until the isocyanate group content reaches the theoretical end point, and removing the solvent by rotary evaporation to obtain a hydrophilic additive;

[0010] S2: Take polyester masterbatch and hydrophilic additive, mix and stir, add them into a screw extruder for melt spinning, and obtain polyester yarn.

[0011] Dimethyl terephthalate and ethylene glycol undergo an ester exchange reaction to obtain an intermediate containing -OH at both ends, so that it can participate in the next step of the reaction with an isocyanate group.

[0012] More optimally, the special-shaped cross section refers to a cross section with grooves, such as a Y-shaped cross section, a M-shaped cross section, a cross-shaped cross section, etc.

[0013] More optimally, the special-shaped cross section is a cross-shaped cross section.

[0014] More optimally, the intermediate includes the following raw materials, calculated by mass: 20 parts of dimethyl terephthalate, 10-12 parts of ethylene glycol, and 0.2-0.3 parts of sodium acetate; the hydrophilic additive includes the following raw materials, calculated by mass: 18-22 parts of the intermediate, 5-8 parts of polyethylene glycol (polyethylene glycol-1000), 4-6 parts of modified diatomaceous earth, 20-30 parts of solvent, 10-15 parts of diisocyanate, and 1-2 parts of tin catalyst.

[0015] More optimally, the preparation of the modified diatomaceous earth includes the following steps: putting diatomaceous earth, microcrystalline cellulose and hydroxyethyl methacrylate into a ball mill, and ball milling for 10 to 12 hours at a rotation speed of 200 to 220 rpm to obtain modified diatomaceous earth.

[0016] Ball milling uses mechanical force to make -OH and silanol groups on the surface of diatomite combine with each other to obtain modified diatomite.

[0017] More optimally, the modified diatomaceous earth comprises the following raw materials, calculated by weight: 40-50 parts of diatomaceous earth, 2-3 parts of microcrystalline cellulose, and 1-2 parts of hydroxyethyl methacrylate.

[0018] More optimally, the sericin solution includes 20-25 g / L of vinyl sericin, 1-2 g / L of photoinitiator, and the rest is deionized water;

[0019] The vinylized sericin comprises the following raw materials, calculated by weight: 2-3 parts of sericin and 18-20 parts of methacrylic anhydride.

[0020] More optimally, the preparation of the vinylized sericin comprises the following steps: taking sericin and methacrylic anhydride, stirring and treating at 0-5°C and pH 7-8 for 6-8 hours, and dialyzing to remove unreacted methacrylic anhydride to obtain vinylized sericin.

[0021] More optimally, the specific process of melt extrusion of the polyester filament is: extrusion after melting at 250~280℃, the annular blowing wind speed is 0.35~0.5 m / min, the length of the annular blowing wind tube is 120~165 cm, the stretching multiple is 1.8~2.2 times, the winding tension is controlled at 20~23cN, and the spinning winding speed is 1500~2500 m / min.

[0022] More optimally, the polyester staple fibers with special-shaped cross-sections have a fineness of 50-80 dtex and an average length of 35-40 mm.

[0023] More optimally, the above-mentioned high-elastic composite twisted yarn can be woven into a moisture-absorbing and quick-drying fabric.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are: the polyester yarn and the polyester staple yarn with special cross-section are used together in a certain proportion, and the advantages of both can be combined to obtain a basic yarn with good elasticity, good water absorption and quick drying properties;

[0025] The polyester yarn is obtained by melt extrusion of polyester masterbatch and hydrophilic additive, and the hydrophilic additive is a polyurethane structure, which can increase the elasticity of polyester; it contains dimethyl terephthalate, which has a structure similar to that of polyester masterbatch molecules and can improve the binding property between the hydrophilic finishing agent and the polyester masterbatch; polyethylene glycol has good hydrophilicity, and diatomaceous earth has a porous structure, which can significantly improve the moisture absorption and quick-drying properties of polyester; the diatomaceous earth is modified diatomaceous earth, and the hydroxyl groups are combined with the silicon hydroxyl groups on the surface of the diatomaceous earth through the mechanical force of ball milling to obtain the modified diatomaceous earth, wherein the microcrystalline cellulose contains a large amount of hydroxyl groups, which improves the hydrophilicity and enhances the dispersibility of the modified diatomaceous earth; hydroxyethyl methacrylate introduces double bonds on the surface of the diatomaceous earth, so that it can be tightly combined with the vinylized sericin in the subsequent steps;

[0026] The base yarn is immersed in a solution containing vinylized sericin and cross-linked by ultraviolet light under the catalysis of a photoinitiator to obtain a high-elastic composite twisted yarn. The sericin has good water absorption and quick drying properties. After the immersion treatment, the sericin is coated on the base yarn to enhance the bonding force between the two yarns. Since the polyester yarn contains modified diatomaceous earth with double bonds, the vinylized sericin has good bonding force with it and can form a more uniform coating layer.

[0027] The high-elastic composite twisted yarn prepared by the present invention adopts a method of preparing polyester filaments + impregnated sericin solution by melt extrusion of polyester masterbatch and hydrophilic additives in order to improve its moisture absorption and quick-drying properties, which effectively solves the problem that the performance of the polyester filaments is reduced due to too many additives inside and the hand feel is reduced due to too many additives in the impregnation solution. At the same time, since the polyester filaments contain modified diatomaceous earth with double bonds, the uniformity and bonding force of the vinylized sericin coating layer are improved, and finally a high-elastic composite twisted yarn with good elasticity and good water absorption and quick-drying properties is prepared; the fabric prepared with the yarn has good elasticity and moisture absorption and quick-drying properties. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0029] The following parts are by mass unless otherwise specified;

[0030] In the following examples, the specific process of melt spinning of polyester yarn is as follows: extrusion after melting at 260°C, annular blowing wind speed of 0.5 m / min, annular blowing wind tube length of 135 cm, stretching multiple of 2 times, winding tension control of 22 cN, spinning winding speed of 2200 m / min;

[0031] The polyester staple yarn with special cross-section has a fineness of 58dtex and an average length of 38mm;

[0032] The shaping process is: shaping at 90℃ for 90min.

[0033] Example 1: S1: 3 parts of sericin and 20 parts of methacrylic anhydride were stirred at 2°C and pH 7 for 8 hours, and unreacted methacrylic anhydride was removed by dialysis to obtain vinyl sericin; a sericin solution was prepared: the sericin solution included 20 g / L of vinyl sericin, 1 g / L of a photoinitiator, and the rest was deionized water;

[0034] S2: 50 parts of diatomaceous earth, 2 parts of microcrystalline cellulose, and 2 parts of hydroxyethyl methacrylate were put into a ball mill, and ball milled on a planetary ball mill for 12 hours at a speed of 200 rpm to obtain modified diatomaceous earth;

[0035] S3: Take 20 parts of dimethyl terephthalate, 12 parts of ethylene glycol, and 0.25 parts of sodium acetate, stir evenly at 145°C, heat to 178°C and stir for 5h to obtain an intermediate; add 20 parts of the intermediate, 6 parts of polyethylene glycol, 5 parts of modified diatomaceous earth, and 25 parts of ethanol to a three-necked flask equipped with a polytetrafluoroethylene stirring rod, a condenser and a nitrogen conduit, stir evenly, heat to 75°C, add 12 parts of isophorone diisocyanate and 1.5 parts of dibutyltin dilaurate, stir to react, determine the content of isocyanate groups in the system by toluene-di-n-butylamine titration method to reach the theoretical end point, and stop the reaction; remove the solvent by rotary evaporation to obtain a hydrophilic additive;

[0036] S4: Take 100 parts of polyester masterbatch and 18 parts of hydrophilic additive, add them into a high-speed stirrer, mix and stir at room temperature for 4 hours, add them into a screw extruder through the main feeding port, melt-spin, and obtain polyester yarn;

[0037] S5: taking polyester yarn and polyester staple yarn with a mass ratio of 85:15, twisting them together to a twist of 500 twists / m; shaping them, cooling them to room temperature, and obtaining basic yarn;

[0038] S6: The base yarn is immersed in the sericin solution, nitrogen is introduced for 30 minutes, and then placed in a UV cross-linking instrument, irradiated at 365 nm for 20 minutes, washed with water, and dried to obtain a high-elastic composite twisted yarn.

[0039] Example 2: S1: 2 parts of sericin and 18 parts of methacrylic anhydride were stirred at 2°C and pH 7 for 8 hours, and unreacted methacrylic anhydride was removed by dialysis to obtain vinyl sericin; a sericin solution was prepared: the sericin solution included 20 g / L of vinyl sericin, 1 g / L of a photoinitiator, and the rest was deionized water;

[0040] S2: 50 parts of diatomaceous earth, 3 parts of microcrystalline cellulose, and 1 part of hydroxyethyl methacrylate were put into a ball mill, and ball milled on a planetary ball mill for 12 hours at a speed of 200 rpm to obtain modified diatomaceous earth;

[0041] S3: Take 20 parts of dimethyl terephthalate, 10 parts of ethylene glycol, and 0.25 parts of sodium acetate, stir evenly at 145°C, heat to 178°C and stir for 5h to obtain an intermediate; add 18 parts of the intermediate, 5 parts of polyethylene glycol, 4 parts of modified diatomaceous earth, and 25 parts of ethanol to a three-necked flask equipped with a polytetrafluoroethylene stirring rod, a condenser and a nitrogen conduit, stir evenly, heat to 75°C, add 10 parts of isophorone diisocyanate and 1.5 parts of dibutyltin dilaurate, stir to react, determine the content of isocyanate groups in the system by toluene-di-n-butylamine titration method to reach the theoretical end point, and stop the reaction; remove the solvent by rotary evaporation to obtain a hydrophilic additive;

[0042] S4: Take 100 parts of polyester masterbatch and 20 parts of hydrophilic additive, add them into a high-speed stirrer, mix and stir at room temperature for 4 hours, add them into a screw extruder through the main feeding port, melt-spin, and obtain polyester yarn;

[0043] S5: taking polyester yarn and polyester staple yarn with a mass ratio of 80:20, twisting them together to a twist of 500 twists / m; shaping them, cooling them to room temperature, and obtaining basic yarn;

[0044] S6: The base yarn is immersed in the sericin solution, nitrogen is introduced for 30 minutes, and then placed in a UV cross-linking instrument, irradiated at 365 nm for 20 minutes, washed with water, and dried to obtain a high-elastic composite twisted yarn.

[0045] Example 3: S1: 3 parts of sericin and 20 parts of methacrylic anhydride were stirred at 2°C and pH 7 for 8 hours, and unreacted methacrylic anhydride was removed by dialysis to obtain vinyl sericin; a sericin solution was prepared: the sericin solution included 20 g / L of vinyl sericin, 1 g / L of a photoinitiator, and the rest was deionized water;

[0046] S2: 50 parts of diatomaceous earth, 3 parts of microcrystalline cellulose, and 2 parts of hydroxyethyl methacrylate were put into a ball mill, and ball milled on a planetary ball mill for 12 hours at a speed of 200 rpm to obtain modified diatomaceous earth;

[0047] S3: Take 20 parts of dimethyl terephthalate, 12 parts of ethylene glycol, and 0.25 parts of sodium acetate, stir evenly at 145°C, heat to 178°C and stir for 5h to obtain an intermediate; add 22 parts of the intermediate, 8 parts of polyethylene glycol, 6 parts of modified diatomaceous earth, and 25 parts of ethanol to a three-necked flask equipped with a polytetrafluoroethylene stirring rod, a condenser and a nitrogen conduit, stir evenly, heat to 75°C, add 15 parts of isophorone diisocyanate and 1.5 parts of dibutyltin dilaurate, stir to react, determine the content of isocyanate groups in the system by toluene-di-n-butylamine titration method to reach the theoretical end point, and stop the reaction; remove the solvent by rotary evaporation to obtain a hydrophilic additive;

[0048] S4: Take 100 parts of polyester masterbatch and 15 parts of hydrophilic additive, add them into a high-speed stirrer, mix and stir at room temperature for 4 hours, add them into a screw extruder through the main feeding port, melt-spin, and obtain polyester yarn;

[0049] S5: taking polyester yarn and polyester staple yarn with a mass ratio of 90:10, twisting them together to a twist of 500 twists / m; shaping them, cooling them to room temperature, and obtaining basic yarn;

[0050] S6: The base yarn is immersed in the sericin solution, nitrogen is introduced for 30 minutes, and then placed in a UV cross-linking instrument, irradiated at 365 nm for 20 minutes, washed with water, and dried to obtain a high-elastic composite twisted yarn.

[0051] Comparative Example 1 (diatomaceous earth is used instead of modified diatomaceous earth, and the other steps are the same as those of Example 1): S1: 3 parts of sericin and 20 parts of methacrylic anhydride are taken, stirred and treated at 2° C. and pH 7 for 8 hours, and unreacted methacrylic anhydride is removed by dialysis to obtain vinyl sericin; a sericin solution is prepared: the sericin solution comprises 20 g / L of vinyl sericin, 1 g / L of a photoinitiator, and the rest is deionized water;

[0052] S2: Take 20 parts of dimethyl terephthalate, 12 parts of ethylene glycol, and 0.25 parts of sodium acetate, stir evenly at 145°C, heat to 178°C and stir for 5h to obtain an intermediate; add 20 parts of the intermediate, 6 parts of polyethylene glycol, 5 parts of diatomaceous earth, and 25 parts of ethanol to a three-necked flask equipped with a polytetrafluoroethylene stirring rod, a condenser and a nitrogen conduit, stir evenly, heat to 75°C, add 12 parts of isophorone diisocyanate and 1.5 parts of dibutyltin dilaurate, stir to react, determine the content of isocyanate groups in the system by toluene-di-n-butylamine titration method to reach the theoretical end point, and stop the reaction; remove the solvent by rotary evaporation to obtain a hydrophilic additive;

[0053] S3: Take 100 parts of polyester masterbatch and 18 parts of hydrophilic additive, add them into a high-speed stirrer, mix and stir at room temperature for 4 hours, add them into a screw extruder through the main feeding port, melt-spin, and obtain polyester yarn;

[0054] S4: taking polyester yarn and polyester staple yarn with a mass ratio of 85:15, twisting them together to a twist of 500 twists / m; shaping them, cooling them to room temperature, and obtaining basic yarn;

[0055] S5: The base yarn is immersed in the sericin solution, nitrogen is introduced for 30 minutes, and then placed in a UV cross-linking instrument, irradiated at 365 nm for 20 minutes, washed with water, and dried to obtain a high-elastic composite twisted yarn.

[0056] Comparative Example 2 (the amount of each raw material added in the hydrophilic additive was changed, and the other method steps were consistent with Example 1): S1: 3 parts of sericin and 20 parts of methacrylic anhydride were taken, stirred for 8 hours at 2°C and pH 7, and unreacted methacrylic anhydride was removed by dialysis to obtain vinyl sericin; a sericin solution was prepared: the sericin solution included 20 g / L of vinyl sericin, 1 g / L of photoinitiator, and the rest was deionized water;

[0057] S2: 50 parts of diatomaceous earth, 2 parts of microcrystalline cellulose, and 2 parts of hydroxyethyl methacrylate were put into a ball mill, and ball milled on a planetary ball mill for 12 hours at a speed of 200 rpm to obtain modified diatomaceous earth;

[0058] S3: Take 20 parts of dimethyl terephthalate, 12 parts of ethylene glycol, and 0.25 parts of sodium acetate, stir evenly at 145°C, heat to 178°C and stir for 5 hours to obtain an intermediate; add 15 parts of the intermediate, 10 parts of polyethylene glycol, 8 parts of modified diatomaceous earth, and 25 parts of ethanol to a three-necked flask equipped with a polytetrafluoroethylene stirring rod, a condenser, and a nitrogen conduit, stir evenly, heat to 75°C, add 12 parts of isophorone diisocyanate and 1.5 parts of dibutyltin dilaurate, stir to react, determine the content of isocyanate groups in the system by toluene-di-n-butylamine titration method to reach the theoretical end point, and stop the reaction; remove the solvent by rotary evaporation to obtain a hydrophilic additive;

[0059] S4: Take 100 parts of polyester masterbatch and 18 parts of hydrophilic additive, add them into a high-speed stirrer, mix and stir at room temperature for 4 hours, add them into a screw extruder through the main feeding port, melt and extrude to obtain polyester filaments;

[0060] S5: taking polyester yarn and polyester staple yarn with a mass ratio of 85:15, twisting them together to a twist of 500 twists / m; shaping them, cooling them to room temperature, and obtaining basic yarn;

[0061] S6: The base yarn is immersed in the sericin solution, nitrogen is introduced for 30 minutes, and then placed in a UV cross-linking instrument, irradiated at 365 nm for 20 minutes, washed with water, and dried to obtain a high-elastic composite twisted yarn.

[0062] Comparative Example 3 (the method of adding the hydrophilic additive is changed, and the other steps are the same as those of Example 1): S1: 3 parts of sericin and 20 parts of methacrylic anhydride are taken, stirred and treated at 2° C. and pH 7 for 8 hours, and unreacted methacrylic anhydride is removed by dialysis to obtain vinyl sericin; a sericin solution is prepared: the sericin solution comprises 20 g / L of vinyl sericin, 1 g / L of a photoinitiator, and the rest is deionized water;

[0063] S2: 50 parts of diatomaceous earth, 2 parts of microcrystalline cellulose, and 2 parts of hydroxyethyl methacrylate were put into a ball mill, and ball milled on a planetary ball mill for 12 hours at a speed of 200 rpm to obtain modified diatomaceous earth;

[0064] S3: Take 20 parts of dimethyl terephthalate, 12 parts of ethylene glycol, and 0.25 parts of sodium acetate, stir evenly at 145°C, heat to 178°C and stir for 5h to obtain an intermediate; add 20 parts of the intermediate, 6 parts of polyethylene glycol, 5 parts of modified diatomaceous earth, and 25 parts of ethanol to a three-necked flask equipped with a polytetrafluoroethylene stirring rod, a condenser and a nitrogen conduit, stir evenly, heat to 75°C, add 12 parts of isophorone diisocyanate and 1.5 parts of dibutyltin dilaurate, stir to react, determine the content of isocyanate groups in the system by toluene-di-n-butylamine titration method to reach the theoretical end point, and stop the reaction; remove the solvent by rotary evaporation to obtain a hydrophilic additive;

[0065] S4: Take 100 parts of polyester masterbatch, add it into a high-speed stirrer, mix and stir at room temperature for 4 hours, add it into a screw extruder through the main feeding port, melt and extrude it to obtain polyester filaments;

[0066] S5: taking polyester yarn and polyester staple yarn with a mass ratio of 85:15, twisting them together to a twist of 500 twists / m; shaping them, cooling them to room temperature, and obtaining basic yarn;

[0067] S6: The base yarn is immersed in a sericin solution, 20 g / L of a hydrophilic additive is added, nitrogen is introduced for 30 minutes, and then placed in a UV cross-linking instrument, irradiated at 365 nm for 20 minutes, washed with water, and dried to obtain a high-elastic composite twisted yarn.

[0068] Comparative Example 4 (changing the method of adding vinylized sericin, and the other steps are the same as those in Example 1): S1: taking 3 parts of sericin and 20 parts of methacrylic anhydride, stirring and treating at 2° C. and pH 7 for 8 h, dialyzing to remove unreacted methacrylic anhydride, and obtaining vinylized sericin;

[0069] S2: 50 parts of diatomaceous earth, 2 parts of microcrystalline cellulose, and 2 parts of hydroxyethyl methacrylate were put into a ball mill, and ball milled on a planetary ball mill for 12 hours at a speed of 200 rpm to obtain modified diatomaceous earth;

[0070] S3: Take 20 parts of dimethyl terephthalate, 12 parts of ethylene glycol, and 0.25 parts of sodium acetate, stir evenly at 145°C, heat to 178°C and stir for 5h to obtain an intermediate; add 20 parts of the intermediate, 6 parts of polyethylene glycol, 5 parts of modified diatomaceous earth, and 25 parts of ethanol to a three-necked flask equipped with a polytetrafluoroethylene stirring rod, a condenser and a nitrogen conduit, stir evenly, heat to 75°C, add 12 parts of isophorone diisocyanate and 1.5 parts of dibutyltin dilaurate, stir to react, determine the content of isocyanate groups in the system by toluene-di-n-butylamine titration method to reach the theoretical end point, and stop the reaction; remove the solvent by rotary evaporation to obtain a hydrophilic additive;

[0071] S4: 100 parts of polyester masterbatch, 18 parts of hydrophilic additives, 5 parts of vinyl sericin, and 0.1 parts of photoinitiator are added to a high-speed stirrer, mixed and stirred at room temperature for 4 hours, added to a screw extruder through a main feed port, melt-extruded, and irradiated with 365nm ultraviolet light for 20 minutes to obtain polyester yarn;

[0072] S5: Take polyester yarn and polyester staple yarn with a mass ratio of 85:15, twist them together, and the twist is 500 twists / m; shape them, and cool them to room temperature to obtain high-elastic composite twisted yarn.

[0073] In the above examples, the test methods used are conventional methods unless otherwise specified; the raw materials used are commercially available unless otherwise specified, and the sources of the raw materials are as follows: sericin (Y0051, Hubei Yunmei Technology Co., Ltd.); methacrylic anhydride (CAS: 760-93-0); diatomaceous earth (20240710, Yajiang); microcrystalline cellulose (S14009, Shanghai Yuanye); hydroxyethyl methacrylate (CAS: 868-77-9); dimethyl terephthalate (CAS: 120-61-6 ); ethylene glycol (CAS: 107-21-1); sodium acetate (CAS: 127-09-3); polyethylene glycol (polyethylene glycol-1000, Shanghai Fangye Chemical Co., Ltd.); ethanol (CAS: 64-17-5); isophorone diisocyanate (CAS: 4098-71-9); dibutyltin dilaurate (CAS: 77-58-7); polyester masterbatch (99%, for spinning, Jadell); photoinitiator (photoinitiator 2959, CAS: 106797-53-9).

[0074] Experiment: Take the high elastic composite twisted yarn prepared in Examples 1-3 and Comparative Examples 1-4; (1) Weave the yarn into grey fabric through low density weaving, and set it in a high temperature setting machine at 200°C at a speed of 80 m / min to obtain a fabric with a gram weight of 135 g / m2. Soak it in salt water for 30 min, and air-dry it. Then, refer to FZ / T70006-2004 to test the elastic recovery rate (in the weft direction); (2) Test the moisture absorption and quick-drying performance with reference to GB / T21655.1-2008; The specific data are shown in the following table:

[0075]

[0076] Conclusion: From the above table, in Comparative Example 1, diatomaceous earth is used instead of modified diatomaceous earth, and the performance is reduced, which shows the importance of modified diatomaceous earth; in Comparative Example 2, the amount of each raw material added in the hydrophilic additive is changed: less intermediates, more polyethylene glycol and modified diatomaceous earth, although the content of the hydrophilic component is increased, the performance is reduced due to insufficient compatibility; in Comparative Example 3, the addition method of the hydrophilic additive is changed, and the yarn is modified by impregnation, but the effect is not as good as that of the embodiment, and the yarn feel will also change; in Comparative Example 4, the addition method of vinylized sericin is changed, and it is melt-extruded together with polyester masterbatch, and the performance is reduced due to compatibility problems; in summary, the high-elastic composite twisted yarn and moisture-absorbing and quick-drying fabric prepared by the present invention have good elasticity and moisture-absorbing and quick-drying properties.

[0077] 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.

Claims

1. A method for producing a high-elastic composite twisted yarn, characterized in that: The following steps are involved: S1: Take diatomaceous earth, microcrystalline cellulose and hydroxyethyl methacrylate, and ball-mill for 10-12 hours to obtain modified diatomaceous earth; S2: Take dimethyl terephthalate, ethylene glycol, and sodium acetate, stir evenly, heat to 170-180°C and stir for 4-6 hours to obtain an intermediate; take the intermediate, polyethylene glycol, modified diatomaceous earth, and solvent, stir evenly, heat to 70-75°C, add diisocyanate and tin catalyst, stir and react until the isocyanate group content reaches the theoretical end point, remove the solvent, and obtain a hydrophilic additive; S3: taking polyester masterbatch and hydrophilic additive, mixing and stirring, and melt spinning to obtain polyester yarn; S4: taking polyester yarn and polyester staple yarn with a mass ratio of (80-90):(10-20), twisting the two yarns in opposite twist directions and with a twist of 400-800 twists / m, and shaping them to obtain basic yarn; S5: immersing the base yarn in a sericin solution, introducing nitrogen gas, irradiating with ultraviolet light, washing with water, and drying to obtain a high-elastic composite twisted yarn; The modified diatomaceous earth includes the following raw materials, calculated by weight: 40-50 parts of diatomaceous earth, 2-3 parts of microcrystalline cellulose, and 1-2 parts of hydroxyethyl methacrylate; The intermediate includes the following raw materials, calculated by mass: 20 parts of dimethyl terephthalate, 10-12 parts of ethylene glycol, and 0.2-0.3 parts of sodium acetate; The hydrophilic additive includes the following raw materials, calculated by weight: 18 to 22 parts of an intermediate, 5 to 8 parts of polyethylene glycol, 4 to 6 parts of modified diatomaceous earth, 20 to 30 parts of a solvent, 10 to 15 parts of a diisocyanate, and 1 to 2 parts of a tin catalyst; The polyester yarn includes the following raw materials, calculated by weight: 100 parts of polyester masterbatch, 15-20 parts of hydrophilic additives; The sericin solution includes 20-25 g / L of vinyl sericin, 1-2 g / L of a photoinitiator, and the rest is deionized water; The steps for preparing vinylized sericin are as follows: taking 2-3 parts of sericin and 18-20 parts of methacrylic anhydride, stirring and treating at 0-5°C and pH 7-8 for 6-8 hours, and dialyzing to remove unreacted methacrylic anhydride to obtain vinylized sericin.

2. The method for producing a high-elastic composite twisted yarn according to claim 1, characterized in that: The specific process of melt spinning is: extrusion after melting at 250-280°C, the annular blowing speed is 0.35-0.5 m / min, the length of the annular blowing cylinder is 120-165 cm, the stretching multiple is 1.8-2.2 times, the winding tension is controlled at 20-23 cN, and the spinning winding speed is 1500-2500 m / min.

3. The method for producing a high-elastic composite twisted yarn according to claim 1, characterized in that: The polyester staple yarn with a special cross-section has a fineness of 50-80 dtex and an average length of 35-40 mm.

4. A high-elastic composite twisted yarn prepared according to the production method of a high-elastic composite twisted yarn according to any one of claims 1 to 3.

5. A method for producing a moisture-absorbing and quick-drying fabric, characterized in that: The high-elastic composite twisted yarn described in claim 4 is woven into a grey cloth at a low density, and then subjected to a high-temperature setting machine setting treatment to obtain a moisture-absorbing quick-drying fabric.

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