A manufacturing process of soft ultrafine coated yarn

Abstract

The present invention relates to the technical field of coated yarns, and discloses a manufacturing process of a soft ultrafine coated yarn, comprising the following steps: S1, uniformly mixing polyether polyol, ionic liquid, and hydroxylated modified lignin to obtain a mixed solution; the ionic liquid is an ionic liquid with a terminal hydroxyl functional group; S2, mixing the mixed solution, 4,4'-diphenylmethane diisocyanate, and a solvent, and performing a first reaction under a nitrogen atmosphere; then, adding a catalyst for a second reaction, and obtaining a modified polyurethane after the reaction ends; S3, spinning the obtained modified polyurethane to obtain a modified spandex filament, using the modified spandex filament as a core yarn, and coating the core yarn with an outer yarn in a spiral manner to obtain a soft ultrafine coated yarn; the outer yarn contains radiation refrigeration particles. The coated yarn obtained by the method of the present invention has excellent softness, antistatic property, anti-ultraviolet property, mechanical property, and heat insulation effect.

Description

Technical Field

[0001] The invention relates to the technical field of coated yarns, in particular to a manufacturing process of soft ultra-fine coated yarns. Background Art

[0002] Covered yarn, also known as wrapped yarn, is a new type of yarn structure. It uses filament or staple fiber as the yarn core and is covered with another filament or staple fiber yarn. The outer yarn covers the core yarn in a spiral manner. Its characteristics are uniform yarn, bulky and full, smooth yarn with less hairiness, high strength and less broken ends. Covered yarn is mostly used for knitted fabrics that require high elasticity, and some are used for woven fabrics. It is an ideal yarn for high-grade thin wool, linen fabrics, jacquard double-layer weft knitted fabrics and warp knitted fabrics. According to the purpose, the covered yarn can choose appropriate core yarn and outer yarn, and its strength is higher than any single yarn.

[0003] Patent CN114561734A discloses a method for preparing a light, thin, wear-resistant, high-strength fabric, which uses high-count spandex stretch yarn, high-elastic milk yarn, nylon high-elastic yarn, Tencel, graphene fiber, meta-aramid resin precipitated fiber, and bamboo charcoal fiber line for composite weaving, hot pressing, and impregnation with a finishing agent with wear resistance, so that the prepared fabric has elasticity, lightness, air permeability and wear resistance, and improves the quality of the fabric. However, the fabric produced does not have antibacterial properties, and the antistatic property needs to be improved, and the softness is insufficient, which limits the application of the fabric. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a manufacturing process of soft ultrafine coated yarn.

[0005] The technical solution of the present invention is as follows:

[0006] A manufacturing process of soft ultrafine coated yarn comprises the following steps:

[0007] S1, preparation of a mixed solution: uniformly mixing a polyether polyol, an ionic liquid, and a hydroxylated modified lignin to obtain a mixed solution; the ionic liquid is an ionic liquid having a terminal hydroxyl functional group;

[0008] S2, preparation of modified polyurethane: mixing the mixed liquid, 4,4'-diphenylmethane diisocyanate and solvent, and performing a first reaction under a nitrogen atmosphere; then, adding a catalyst to perform a second reaction, and after the reaction is completed, a modified polyurethane is obtained;

[0009] S3. Spinning the obtained modified polyurethane to obtain modified spandex filaments, using the modified spandex filaments as core yarns, and wrapping the core yarns with outer yarns in a spiral manner to obtain soft ultrafine coated yarns; the outer yarns contain radiation refrigeration particles.

[0010] As a preferred embodiment of the present invention, in step S1: the ionic liquid includes at least one of a quaternary ammonium ionic liquid having a terminal hydroxyl functional group, a quaternary phosphonium ionic liquid having a terminal hydroxyl functional group, a pyridine ionic liquid having a terminal hydroxyl functional group, and an imidazole ionic liquid having a terminal hydroxyl functional group.

[0011] As a preferred embodiment of the present invention, the anion of the ionic liquid is selected from at least one of halide ions, trifluoromethanesulfonate ions, bistrifluoromethanesulfonyl imide ions, nitrate ions, sulfate ions, carboxylate ions and dicyandiamide ions.

[0012] As a preferred embodiment of the present invention, in step S1: the hydroxylated modified lignin includes at least one of hydroxylated modified alkali lignin and hydroxylated modified acetic acid lignin.

[0013] As a preferred embodiment of the present invention, in step S1: the polyether polyol includes at least one of polytetramethylene ether glycol, polyoxypropylene glycol, and tetramethylene ether glycol.

[0014] As a preferred embodiment of the present invention, in step S1: the mass ratio of the polyether polyol, the ionic liquid, and the hydroxylated modified lignin is (15-20): (2-8): (1-6).

[0015] As a preferred embodiment of the present invention, in step S2: the mass ratio of the mixed solution, 4,4'-diphenylmethane diisocyanate, solvent and catalyst is (10-15): (20-22): (100-120): (2-5).

[0016] As a preferred embodiment of the present invention, in step S2: the reaction temperature of the first reaction is 75-95°C, and the reaction time is 1-2.5h.

[0017] As a preferred embodiment of the present invention, in step S2: the reaction temperature of the second reaction is 50-75°C, and the reaction time is 3.5-6h.

[0018] As a preferred embodiment of the present invention, in step S2: the solvent includes at least one of N-methylpyrrolidone, N,N-dimethylformamide, butyl acetate, toluene, xylene, butanone, and cyclohexanone.

[0019] As a preferred embodiment of the present invention, in step S2: the catalyst includes at least one of ethylenediamine, triethylamine, N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, N,N,N',N'-tetramethylalkylenediamine, pyridine, and N,N'-dimethylpyridine.

[0020] As a preferred embodiment of the present invention, in step S3: the modified spandex filament is 20-40D.

[0021] As a preferred embodiment of the present invention, in step S3: the outer covering yarn is 20-40D.

[0022] As a preferred embodiment of the present invention, in step S3: the particle size of the radiation cooling particles is 3-10 μm.

[0023] As a preferred embodiment of the present invention, in step S3: the amount of the radiation refrigeration particles is 2-10wt% of the mass of the outer yarn.

[0024] As a preferred embodiment of the present invention, in step S3: the preparation method of the radiation refrigeration particles is: dispersing TiO2 and SiO2 in an ethanol aqueous solution to form a dispersion, then adding alkaline lignin, cellulose, and a hydrophobic modifier, adjusting the pH to neutral to weakly alkaline, stirring at 30-60°C for a period of time, removing the supernatant, washing the remaining solid with water, and drying to obtain the radiation refrigeration particles.

[0025] As a preferred embodiment of the present invention, the mass ratio of TiO2, SiO2, alkali lignin, cellulose and hydrophobic modifier is (5-20): (5-20): (2-40): (5-20): (1-50).

[0026] As a preferred embodiment of the present invention, step S3 further includes step S4: applying an organic solvent to the obtained soft ultrafine coated yarn, and then drying the organic solvent.

[0027] As a preferred embodiment of the present invention, the organic solvent may be applied by dipping, spraying or dripping.

[0028] As a preferred embodiment of the present invention, the organic solvent includes at least one of methanol, ethanol, acetone, ether, ethyl acetate and chloroform.

[0029] The beneficial effects that can be achieved by the present invention are:

[0030] Ionic liquids are cationic surfactants with electrostatic adsorption, thus giving the resulting coated yarn excellent antistatic properties; after the fiber adsorbs the surfactant, the hydrophobic group of the surfactant faces the outside of the fiber surface, forming a lubricant film between the fibers, reducing the static friction coefficient of the fiber and increasing the smoothness and softness of the fiber. In addition, the ionic liquid used in the present invention is an ionic liquid with a terminal hydroxyl functional group, which can participate in the polyurethane synthesis process and enter the internal structure of the polyurethane, so that the polyurethane can obtain long-term antistatic properties; the ionic liquid can be well dispersed in the polyurethane, and can also play an effect of inducing polyurethane nucleation, promoting the acceleration of the synthesis reaction. Lignin is an aromatic polymer widely found in plants. It contains a large number of conjugated structures such as benzene rings, carbonyl groups, and phenolic hydroxyl groups, and has excellent antioxidant and UV resistance. Lignin also participates in the polyurethane synthesis process. After hydroxylation modification, the molecular weight of lignin can be controlled and the hydroxyl content can be increased, thereby improving the reaction activity of lignin and the compatibility in the polyurethane synthesis system, reducing the aggregation of lignin in polyurethane, and increasing the mechanical properties of polyurethane materials. At the same time, it can also give polyurethane long-term UV resistance and degradability. Hydroxylation-modified lignin can also be used as a surfactant to synergize with ionic liquids to improve the antistatic and softness of polyurethane. Adding ionic liquids and lignin in appropriate amounts can improve the antistatic, softness, mechanical and thermodynamic properties of polyurethane, and also give traditional polyurethane materials properties that they do not have, such as degradability, antibacterial and antibacterial. The coated yarn obtained by the present invention has excellent antibacterial and antistatic properties, and is highly stable to water washing and solvent treatment. The outer yarn contains radiation refrigeration particles, which can give the obtained covered yarn a good heat insulation effect and improve the use performance of the obtained fabric in a high temperature environment.

[0031] The quaternary ammonium ionic liquid, quaternary phosphonium ionic liquid, pyridine ionic liquid and imidazole ionic liquid provided by the present invention also have certain antibacterial properties, and can work together with hydroxylated modified lignin to further improve the antibacterial and antifungal properties of polyurethane. TiO2 and SiO2 have the characteristics of high infrared emissivity and low sunlight absorption; TiO2 particles have high reflectivity and can strongly scatter sunlight. After hydrophobic modification, a large number of hydrophobic groups are distributed on the surface and a large number of methoxy groups (-OCH3) are grafted, which increases its radiation refrigeration performance while giving it hydrophobic properties; SiO2 has high infrared emissivity performance, and after hydrophobic modification, its radiation refrigeration performance is also increased, and it cooperates with TiO2 to achieve efficient refrigeration. Lignin has excellent antioxidant and anti-ultraviolet properties, can remove free radicals generated by TiO2 and SiO2 due to light, and improve the aging resistance of the obtained coated yarn; the coating of alkali lignin can make TiO2 and SiO2 self-dispersed in the outer yarn, and improve the structural strength and refrigeration effect of the coated yarn. Cellulose molecules are polar and the interaction between molecular chains is very strong. The addition of cellulose can increase the toughness and elasticity of the coated yarn. In addition, the obtained soft ultra-fine coated yarn is also subjected to the steps of applying an organic solvent and then drying the organic solvent. The organic solvent can make the core yarn and the outer yarn tightly fit together, thereby improving the bonding performance between the core yarn and the outer yarn. Heating can volatilize the organic solvent and shape the coated yarn, thereby improving the structural stability.

[0032] The coated yarn obtained by the method of the present invention is relatively fine, and has excellent softness, antistatic property, anti-ultraviolet property, mechanical property and heat insulation effect. The prepared product is more fine and dense, and has a lighter texture, and has broad prospects for application in fabrics. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used that do not specify the manufacturer are all conventional products that can be obtained commercially.

[0034] The outer covering yarns in the following embodiments and comparative examples are made of nylon, but this does not limit the outer covering yarn material of the present invention.

[0035] Example 1

[0036] A manufacturing process of soft ultrafine coated yarn comprises the following steps:

[0037] S1. Preparation of a mixed solution: polytetrahydrofuran ether glycol, an ionic liquid, and hydroxylated modified lignin are uniformly mixed to obtain a mixed solution; wherein the ionic liquid is a quaternary ammonium ionic liquid having a terminal hydroxyl functional group, and the structural formula is as follows:

[0038]

[0039] The hydroxylated modified lignin is hydroxylated modified alkali lignin, the polyether polyol is polytetramethylene ether diol, and the mass ratio of the polyether polyol, the ionic liquid and the hydroxylated modified lignin is 15:2:6.

[0040] S2. Preparation of modified polyurethane: Mix the mixed liquid, 4,4'-diphenylmethane diisocyanate and solvent, and carry out the first reaction under nitrogen atmosphere, the reaction temperature is 75°C, and the reaction time is 2.5 hours; then, add the catalyst to carry out the second reaction, the reaction temperature is 50°C, and the reaction time is 6 hours. After the reaction, a modified polyurethane is obtained; wherein the mass ratio of the mixed liquid, 4,4'-diphenylmethane diisocyanate, solvent and catalyst is 10:22:100:2.5, the solvent is N-methylpyrrolidone, and the catalyst is ethylenediamine.

[0041] S3. Spinning the obtained modified polyurethane to obtain 20D modified spandex filaments, using the modified spandex filaments as core yarns, and spirally coating the core yarns with 40D outer yarns to obtain soft ultrafine coated yarns; wherein the outer yarns contain 3wt% of radiation refrigeration particles with a particle size of 3-10μm, and the preparation method of the radiation refrigeration particles is as follows: dispersing TiO2 and SiO2 in an ethanol aqueous solution to form a dispersion, and then adding alkali lignin, cellulose, and a hydrophobic modifier, the mass ratio of TiO2, SiO2, alkali lignin, cellulose, and a hydrophobic modifier is 5:5:2:5:3, adjusting the pH to 7.5, stirring at 30°C for 1.5h, removing the upper clear liquid, and washing the remaining solids with water and drying to obtain radiation refrigeration particles.

[0042] Example 2

[0043] A manufacturing process of soft ultrafine coated yarn comprises the following steps:

[0044] S1. Preparation of a mixed solution: uniformly mix polyether polyol, ionic liquid and hydroxylated modified lignin to obtain a mixed solution; wherein the ionic liquid is a pyridine ionic liquid having a terminal hydroxyl functional group, and the structural formula is:

[0045]

[0046] The hydroxylated modified lignin is hydroxylated modified acetic acid lignin, the polyether polyol is polyoxypropylene glycol, and the mass ratio of the polyether polyol, the ionic liquid and the hydroxylated modified lignin is 20:8:1.

[0047] S2. Preparation of modified polyurethane: Mix the mixed liquid, 4,4'-diphenylmethane diisocyanate and solvent, and carry out the first reaction under nitrogen atmosphere at a reaction temperature of 95°C and a reaction time of 1 hour; then, add a catalyst for a second reaction at a reaction temperature of 75°C and a reaction time of 3.5 hours. After the reaction, a modified polyurethane is obtained; wherein the mass ratio of the mixed liquid, 4,4'-diphenylmethane diisocyanate, solvent and catalyst is 15:20:120:5, the solvent is N,N-dimethylformamide, and the catalyst is N,N'-dimethylpyridine.

[0048] S3. Spin the obtained modified polyurethane to obtain 40D modified spandex filaments, use the modified spandex filaments as core yarns, and cover the core yarns with 20D outer covering yarns in a spiral manner to obtain soft ultrafine covered yarns; wherein, the outer covering yarns contain 5wt% of radiation refrigeration particles with a particle size of 3-10μm, and the preparation method of the radiation refrigeration particles is: disperse TiO2 and SiO2 in an ethanol aqueous solution to form a dispersion, and then add alkali lignin, cellulose, and a hydrophobic modifier, the mass ratio of TiO2, SiO2, alkali lignin, cellulose, and a hydrophobic modifier is 2:1:4:2:40, adjust the pH to neutral, stir at 60℃ for 1h, remove the upper clear liquid, wash the remaining solid with water, and dry to obtain the radiation refrigeration particles.

[0049] Example 3

[0050] A manufacturing process of soft ultrafine coated yarn comprises the following steps:

[0051] S1. Preparation of a mixed solution: uniformly mix polyether polyol, ionic liquid and hydroxylated modified lignin to obtain a mixed solution; the ionic liquid is an imidazole ionic liquid having a terminal hydroxyl functional group, and the structure is as follows:

[0052]

[0053] The hydroxylated modified lignin is hydroxylated modified alkali lignin and hydroxylated modified acetic acid lignin (mass ratio 1:1), the polyether polyol is tetrahydrofuran-propylene oxide copolymer glycol, and the mass ratio of polyether polyol, ionic liquid and hydroxylated modified lignin is 18:4:3.

[0054] S2. Preparation of modified polyurethane: Mix the mixed liquid, 4,4'-diphenylmethane diisocyanate and solvent, and carry out the first reaction under nitrogen atmosphere, the reaction temperature is 80°C, and the reaction time is 2h; then, add the catalyst to carry out the second reaction, the reaction temperature is 65°C, and the reaction time is 5h. After the reaction, a modified polyurethane is obtained; wherein the mass ratio of the mixed liquid, 4,4'-diphenylmethane diisocyanate, solvent and catalyst is 12:20:110:3, the solvent is cyclohexanone, and the catalyst is bis(2-dimethylaminoethyl) ether.

[0055] S3. Spin the obtained modified polyurethane to obtain 30D modified spandex filaments, use the modified spandex filaments as core yarns, and cover the core yarns with 20D outer covering yarns in a spiral manner to obtain soft ultrafine covered yarns; wherein, the outer covering yarns contain 7.5wt% of radiation refrigeration particles with a particle size of 3-10μm, and the preparation method of the radiation refrigeration particles is: disperse TiO2 and SiO2 in an ethanol aqueous solution to form a dispersion, and then add alkali lignin, cellulose, and a hydrophobic modifier, the mass ratio of TiO2, SiO2, alkali lignin, cellulose, and a hydrophobic modifier is 15:10:20:7:30, adjust the pH to 8, stir at 40℃ for 1h, remove the upper clear liquid, wash the remaining solids with water, and dry them to obtain radiation refrigeration particles.

[0056] S4: applying ethyl acetate, an organic solvent, to the obtained soft ultrafine covered yarn in an immersion manner, and then drying the organic solvent.

[0057] Example 4

[0058] A manufacturing process of soft ultrafine coated yarn comprises the following steps:

[0059] S1. Preparation of a mixed solution: uniformly mix polyether polyol, ionic liquid and hydroxylated modified lignin to obtain a mixed solution; the ionic liquid is a quaternary phosphonium ionic liquid having a terminal hydroxyl functional group, and the structural formula is as follows:

[0060]

[0061] The hydroxylated modified lignin is hydroxylated modified alkali lignin, the polyether polyol is polytetramethylene ether glycol and polyoxypropylene glycol (mass ratio 1:1), and the mass ratio of the polyether polyol, the ionic liquid and the hydroxylated modified lignin is 17:6:5.

[0062] S2. Preparation of modified polyurethane: mix the mixed liquid, 4,4'-diphenylmethane diisocyanate and solvent, and carry out the first reaction under nitrogen atmosphere, the reaction temperature is 90°C, and the reaction time is 1.5h; then, add the catalyst for the second reaction, the reaction temperature is 60°C, and the reaction time is 5h. After the reaction, a modified polyurethane is obtained; wherein the mass ratio of the mixed liquid, 4,4'-diphenylmethane diisocyanate, solvent and catalyst is 14:21:100:4, the solvent is N-methylpyrrolidone and butyl acetate (mass ratio 1:1), and the catalyst is ethylenediamine and N,N,N',N'-tetramethylalkylenediamine (mass ratio 1:1).

[0063] S3. Spin the obtained modified polyurethane to obtain 20D modified spandex filaments, use the modified spandex filaments as core yarns, and use 30D outer yarns to cover the core yarns in a spiral manner to obtain soft ultrafine covered yarns; wherein the outer yarns contain 9wt% of radiation refrigeration particles with a particle size of 3-10μm, and the preparation method of the radiation refrigeration particles is: disperse TiO2 and SiO2 in an ethanol aqueous solution to form a dispersion, and then add alkali lignin, cellulose, and a hydrophobic modifier, the mass ratio of TiO2, SiO2, alkali lignin, cellulose, and a hydrophobic modifier is 10:20:30:12:20, adjust the pH to 8.5, stir at 50°C for 1h, remove the upper clear liquid, wash the remaining solid with water, and dry to obtain the radiation refrigeration particles.

[0064] S4: applying organic solvent acetone to the obtained soft ultrafine coated yarn in a dropwise manner, and then drying the organic solvent.

[0065] Example 5

[0066] A manufacturing process of soft ultrafine coated yarn comprises the following steps:

[0067] S1. Preparation of a mixed solution: uniformly mix polyether polyol, ionic liquid and hydroxylated modified lignin to obtain a mixed solution; the ionic liquid is a pyridine ionic liquid and an imidazole ionic liquid having a terminal hydroxyl functional group, and the structural formula is as follows:

[0068]

[0069] The hydroxylated modified lignin is hydroxylated modified alkali lignin, the polyether polyol is polytetramethylene ether diol, and the mass ratio of the polyether polyol, the ionic liquid and the hydroxylated modified lignin is 16:5:3.5.

[0070] S2. Preparation of modified polyurethane: Mix the mixed liquid, 4,4'-diphenylmethane diisocyanate and solvent, and carry out the first reaction under nitrogen atmosphere, the reaction temperature is 85°C, and the reaction time is 1.5h; then, add the catalyst for the second reaction, the reaction temperature is 65°C, and the reaction time is 4h. After the reaction, a modified polyurethane is obtained; wherein the mass ratio of the mixed liquid, 4,4'-diphenylmethane diisocyanate, solvent and catalyst is 13:20:100:3, the solvent is N-methylpyrrolidone, N,N-dimethylformamide (mass ratio 1:1), and the catalyst is triethylamine, N,N-dimethylcyclohexylamine (mass ratio 1:1).

[0071] S3. Spinning the obtained modified polyurethane to obtain 20D modified spandex filaments, taking the modified spandex filaments as core yarns, and spirally coating the core yarns with 20D outer coating yarns to obtain soft ultrafine coated yarns; wherein, the outer coating yarns contain 6.5wt% of radiation refrigeration particles with a particle size of 3-10μm, and the preparation method of the radiation refrigeration particles is as follows: dispersing TiO2 and SiO2 in an ethanol aqueous solution to form a dispersion, and then adding alkali lignin, cellulose, and a hydrophobic modifier, the mass ratio of TiO2, SiO2, alkali lignin, cellulose, and a hydrophobic modifier is 12:18:25:13:25, adjusting the pH to 7.5, stirring at 45°C for 1h, removing the upper clear liquid, and washing the remaining solids with water and drying to obtain radiation refrigeration particles.

[0072] S4: applying organic solvent ethanol to the obtained soft ultrafine coated yarn in a spraying manner, and then drying the organic solvent.

[0073] Comparative Example 1

[0074] No ionic liquid was added, and the rest was the same as in Example 1.

[0075] Comparative Example 2

[0076] No hydroxylated modified lignin was added, and the rest was the same as in Example 1.

[0077] Comparative Example 3

[0078] The hydroxylated modified lignin was replaced by alkali lignin, and the rest was the same as in Example 1.

[0079] Comparative Example 4

[0080] No radiation refrigeration particles are added, and the rest is the same as in Example 1.

[0081] The coated yarns obtained in the above examples and comparative examples were used as warp and weft for weaving to obtain fabrics. The fabrics were tested for softness, antibacterial properties, antistatic properties and temperature. The test results are shown in Tables 1 and 2.

[0082] Antibacterial rate: It is determined by GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", in which Escherichia coli is selected as the bacteria.

[0083] Static drape coefficient: determined by GB / T23329-2009 "Determination of Drape of Textile Fabrics".

[0084] Surface resistance: Determined by GB / T22042-2008 "Test method for surface resistivity of antistatic performance of clothing".

[0085] The temperature test method is: irradiate one side of the fabric of the embodiment and the fabric of the comparative example with light of the same intensity at the same time, and after irradiation for a period of time, detect the temperature of the other side of the fabric of the embodiment and the fabric of the comparative example.

[0086] Table 1 Antibacterial rate, static drape coefficient, surface resistance test results of the embodiments and comparative examples

[0087]

[0088] Table 2 Temperature test results of embodiments and comparative examples

[0089]

[0090]

[0091] It can be seen from the data in Table 1 and Table 2 that the performance of the embodiments is better than that of the comparative examples. Compared with comparative examples 1-4, the ionic liquid and hydroxylated modified lignin provided by the present invention can significantly improve the antibacterial rate, static drape coefficient and surface resistance of the fabric, and the ionic liquid and hydroxylated modified lignin work together to significantly improve the antibacterial property, softness and antistatic property of the coated yarn, and finally make the obtained fabric have excellent antibacterial property, softness and antistatic property; among them, the ionic liquid has a significant effect on the static drape coefficient and surface resistance of the fabric, the hydroxylated modified lignin has a significant effect on the antibacterial rate and static drape coefficient of the fabric, and the lignin without hydroxylation modification has a certain effect on the antibacterial rate and static drape coefficient of the fabric; the radiant refrigeration particles provided by the present invention can significantly improve the thermal insulation performance of the fabric, and also have a great effect on the antibacterial rate. The results show that the soft ultrafine coated yarn obtained by the method of the present invention has excellent antibacterial, soft, antistatic and heat-insulating effects; the ionic liquid and the hydroxylated modified lignin participate in the synthesis of polyurethane and become a part of the internal structure of the polyurethane, so that the coated yarn can obtain long-lasting antibacterial and antistatic properties, and can still maintain excellent antibacterial and antistatic properties after washing 50 times.

[0092] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of the present invention.

Claims

1. A manufacturing process for soft ultrafine coated yarn, characterized in that: The following steps are involved: S1, preparation of a mixed solution: uniformly mixing a polyether polyol, an ionic liquid, and a hydroxylated modified lignin to obtain a mixed solution; the ionic liquid is an ionic liquid having a terminal hydroxyl functional group; the ionic liquid includes at least one of a quaternary ammonium ionic liquid having a terminal hydroxyl functional group, a quaternary phosphonium ionic liquid having a terminal hydroxyl functional group, a pyridine ionic liquid having a terminal hydroxyl functional group, and an imidazole ionic liquid having a terminal hydroxyl functional group; The hydroxylated modified lignin includes at least one of hydroxylated modified alkali lignin and hydroxylated modified acetic acid lignin; S2, preparation of modified polyurethane: mixing the mixed liquid, 4,4'-diphenylmethane diisocyanate and solvent, and performing a first reaction under a nitrogen atmosphere; then, adding a catalyst to perform a second reaction, and after the reaction is completed, a modified polyurethane is obtained; S3. Spinning the obtained modified polyurethane to obtain modified spandex filaments, using the modified spandex filaments as core yarns, and wrapping the core yarns with outer yarns in a spiral manner to obtain soft ultrafine coated yarns; the outer yarns contain radiation refrigeration particles.

2. A manufacturing process for a soft ultrafine coated yarn according to claim 1, characterized in that: In step S1: the mass ratio of the polyether polyol, the ionic liquid, and the hydroxylated modified lignin is (15-20): (2-8): (1-6).

3. A manufacturing process of a soft ultrafine coated yarn according to claim 1, characterized in that: In step S2: the mass ratio of the mixed solution, 4,4'-diphenylmethane diisocyanate, solvent and catalyst is (10-15): (20-22): (100-120): (2-5).

4. A manufacturing process of a soft ultrafine coated yarn according to claim 1, characterized in that: In step S2: The reaction temperature of the first reaction is 75-95°C and the reaction time is 1-2.5h; The reaction temperature of the second reaction is 50-75°C, and the reaction time is 3.5-6h.

5. The manufacturing process of a soft ultrafine coated yarn according to claim 1, characterized in that: In step S2: The solvent includes at least one of N-methylpyrrolidone, N,N-dimethylformamide, butyl acetate, toluene, xylene, butanone, and cyclohexanone; The catalyst includes at least one of ethylenediamine, triethylamine, N,N-dimethylcyclohexylamine, bis(2-dimethylaminoethyl) ether, N,N,N',N'-tetramethylalkylenediamine, pyridine and N,N'-dimethylpyridine.

6. A manufacturing process of a soft ultrafine coated yarn according to claim 1, characterized in that: In step S3: the modified spandex filament is 20-40D, and the outer covering yarn is 20-40D.

7. A process for manufacturing a soft ultrafine coated yarn according to claim 1, characterized in that: In step S3: the preparation method of the radiation refrigeration particles is: disperse TiO2 and SiO2 in an ethanol aqueous solution to form a dispersion, then add alkaline lignin, cellulose, and a hydrophobic modifier, adjust the pH to neutral to weakly alkaline, stir at 30-60°C for a period of time, remove the supernatant, wash the remaining solid with water, and dry it to obtain the radiation refrigeration particles.

8. The manufacturing process of a soft ultrafine coated yarn according to claim 1, characterized in that: In step S3: the amount of the radiation refrigeration particles is 2-10wt% of the mass of the outer yarn.

9. A manufacturing process of a soft ultra-fine coated yarn according to claim 1, characterized in that: The method further comprises step S4 after step S3: applying an organic solvent to the obtained soft ultrafine coated yarn, and then drying the organic solvent.

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