Fine all-wool knitting yarn and preparation process thereof

Abstract

The invention relates to the technical field of textile yarns, in particular to a fine all-wool knitting yarn and a preparation process thereof.The preparation process comprises the following steps that S1, modified wool is prepared, specifically, a nano-silver / methoxypolyethylene glycol grafted chitosan compound, sodium polyacrylate and ionic liquid are mixed, and ionic liquid treating fluid is prepared; then putting wool into an ionic liquid treatment solution for dipping treatment, rolling, washing with ethanol, washing with water, and drying to obtain modified wool; s2, the wool is subjected to mixing, carding, gilling, roving, spinning, spooling, doubling, two-for-one twisting and yarn steaming, and the fine all-wool knitting yarn is obtained; the fine all-wool knitting yarn produced by the method has higher strength uniformity and excellent antibacterial performance.

Description

Technical Field

[0001] The present invention relates to the technical field of textile yarns, and particularly relates to a delicate all-wool knitting yarn and a preparation process thereof. Background Art

[0002] As a natural keratin fiber, wool has good elasticity and soft luster, making the wool fabric prepared therefrom light and comfortable to wear and having strong warmth retention, which is deeply favored by consumers. With the development of technology and the improvement of people's living standards, the requirements for wool products are getting higher and higher. In order to obtain high-quality wool products, the performance of the wool knitting yarn for knitting wool products is also required to be relatively high. For example, it is necessary to make the all-wool knitting yarn have a high strength uniformity, so that the overall strength of the all-wool product is higher and it has higher durability.

[0003] If the strength of the all-wool knitting yarn is uneven, it will cause weak knots in the yarn, which are easy to break during the weaving process, increasing the breakage rate during the weaving process, and the large fluctuation of the yarn strength will affect the overall strength and durability of the fabric. Therefore, it is necessary to reduce the coefficient of variation of the strength of the all-wool knitting yarn and improve the uniformity of the strength of the all-wool knitting yarn. To improve the uniformity of the strength of the all-wool knitting yarn, improving processes such as carding and twisting is one of the conventional means. At present, the processes such as carding and twisting and related equipment in the prior art are relatively mature. To further improve the strength uniformity of the wool knitting yarn, the wool can also be modified to obtain corresponding technical effects. Summary of the Invention

[0004] The purpose of the present invention is to provide a delicate all-wool knitting yarn and a preparation process thereof. The produced delicate all-wool knitting yarn has high strength uniformity and excellent antibacterial properties.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions: A preparation process of a delicate all-wool knitting yarn, comprising the following steps: S1. Prepare modified wool: Mix a nano-silver / polyethylene glycol monomethyl ether grafted chitosan complex, sodium polyacrylate and an ionic liquid to prepare an ionic liquid treatment solution; then immerse the wool in the ionic liquid treatment solution, perform rolling, then wash with ethanol, and then wash with water and dry to obtain modified wool; S2. Perform blending, carding, gilling, roving, spinning, winding, doubling, twisting and steaming on the modified wool to obtain the delicate all-wool knitting yarn.

[0006] Preferably, the nanosilver / polyethylene glycol monomethyl ether grafted chitosan complex is 1.5-3% of the mass of the ionic liquid; the sodium polyacrylate is 0.5-1% of the mass of the ionic liquid, and the molecular weight of the sodium polyacrylate is 6000-8000.

[0007] Preferably, during the immersion treatment, the treatment temperature is 65-70° C., and the treatment time is 25-35 min; during the immersion treatment, the mass volume ratio of the ionic liquid treatment solution to the wool is 15-25 mL:1 g.

[0008] Preferably, the method for preparing the ionic liquid treatment solution comprises the following steps: The ionic liquid is heated to 100-105° C. while stirring, and then the nanosilver / polyethylene glycol monomethyl ether grafted chitosan complex and sodium polyacrylate are added while stirring, and the mixture is stirred for 60-90 minutes and ultrasonically treated for 1-2 hours, and then cooled to 65-70° C. to obtain an ionic liquid treatment solution.

[0009] Preferably, the ionic liquid is at least one of 1-butyl-3-methylimidazolium tetrafluoroborate, 1,2-dimethyl-3-ethylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium acetate, and 1-butyl-3-methylimidazolium acetate.

[0010] Preferably, the ionic liquid is at least one of 1-ethyl-3-methylimidazolium acetate and 1-butyl-3-methylimidazolium acetate.

[0011] Preferably, the preparation method of the nanosilver / polyethylene glycol monomethyl ether grafted chitosan composite comprises the following steps: Deionized water, 1-1.2% by weight of silver nitrate, and 80-100% by weight of polyethylene glycol are added to a reaction kettle, wherein the molecular weight of the polyethylene glycol is 600-800; after being fully mixed, the reaction kettle is sealed, and the temperature is raised to 160-170° C. while stirring for 2-3 hours, and then cooled to room temperature, and then water is removed by vacuum distillation to obtain a nano silver solution; 40-80% of the weight of nanosilver solution was added to the polyethylene glycol monomethyl ether grafted chitosan, and then the mixture was placed in a ball mill and mixed for 3-5 hours to obtain a nanosilver / polyethylene glycol monomethyl ether grafted chitosan composite.

[0012] The nanosilver is prepared by the above method, and the obtained nanosilver stock solution is directly ball-milled and mixed with methoxypolyethylene glycol grafted chitosan to prepare a nanosilver / methoxypolyethylene glycol grafted chitosan composite. There is no need to separately isolate the nanosilver. The preparation method is simple. Compared with directly ball-milling and compounding nanosilver particles with methoxypolyethylene glycol grafted chitosan, the strength uniformity of the wool knitted yarn can be enhanced, and the antibacterial property is also improved.

[0013] Preferably, the methoxypolyethylene glycol grafted chitosan is prepared by grafting methoxypolyethylene glycol onto chitosan by the formaldehyde linking method.

[0014] Preferably, during wool blending, water, wool lubricant, and antistatic agent are mixed into a mixed solution and sprayed on the modified wool, and then left at room temperature for 24 - 32 h. The amount of water accounts for 5 - 7% of the total amount of the modified wool, the water temperature is controlled at 40 - 45 °C, the amount of wool lubricant accounts for 1 - 1.5% of the total amount of the modified wool, and the amount of antistatic agent accounts for 0.2 - 0.3% of the total amount of the modified wool. During carding, gilling, roving, and spinning, the relative humidity is controlled at 65 - 70% and the temperature is controlled at 22 - 28 °C.

[0015] As a general inventive concept, the present invention provides a delicate all-wool knitted yarn prepared by a preparation process.

[0016] The beneficial effects of the present invention are: The present invention impregnates wool with an ionic liquid treatment solution. The ionic liquid therein can modify the surface of wool fibers and penetrate into the interior of wool fibers. By improving the surface and internal structures of wool fibers, the strength of the whole wool fibers becomes more uniform, and the wool is made more suitable for spinning. When a nano-silver / methoxypolyethylene glycol grafted chitosan composite is used in combination with the ionic liquid to impregnate wool, methoxypolyethylene glycol grafted chitosan forms a chitosan film on the surface of wool and can partially penetrate into the interior of wool fibers, effectively enhancing the strength uniformity of wool fibers, reducing fiber friction during the spinning process, and enhancing the spinnability of wool. By using methoxypolyethylene glycol modified chitosan, the binding force between the formed chitosan film and wool fibers can be stronger, thus further enhancing the modification effect. By incorporating an appropriate amount of nano-silver into chitosan, the nano-silver material can be evenly dispersed in the chitosan film on the surface of wool fibers, enhancing the strength of the film and further enhancing the strength of wool fibers. Based on its own nano-effect, the nano-silver can be adsorbed on the surface and damaged parts of wool fibers, enhancing the mechanical properties of wool fibers. At the same time, the nano-silver material combined with chitosan can well enhance the antibacterial property of wool fibers, so that the obtained all-wool knitted yarn has good antibacterial effect. In addition, through research, it is found that on the basis of adding the nano-silver / methoxypolyethylene glycol grafted chitosan composite, an appropriate amount of sodium polyacrylate is added, which can further enhance the strength uniformity of the obtained wool knitted yarn. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a process flow chart for the preparation of the fine all-wool knitted yarn of the present invention; Figure 2 It is a process flow chart for the preparation of the modified wool of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] For those conditions not specified in the examples, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase. The technologies not mentioned in the present invention refer to the prior art. Unless otherwise specified, the following examples and comparative examples are parallel tests, using the same treatment steps and parameters.

[0020] When producing fine all-wool knitting yarn, the ionic liquid treatment liquid used in the invention is a raw material nano silver / polyethylene glycol monomethyl ether grafted chitosan complex.

[0021] In a specific embodiment of the present invention, three nano-silver / polyethylene glycol monomethyl ether grafted chitosan composites were prepared. The deacetylation degree of the raw material chitosan used was ≥95%, the viscosity was 100-200 mpa.s, the molecular weight of polyethylene glycol monomethyl ether was 2000, and the molecular weight of polyethylene glycol was 600. Specifically, the preparation methods of nano-silver / polyethylene glycol monomethyl ether grafted chitosan composite I, nano-silver / polyethylene glycol monomethyl ether grafted chitosan composite II, and nano-silver / polyethylene glycol monomethyl ether grafted chitosan composite III are as follows: The preparation method of nano silver / polyethylene glycol monomethyl ether grafted chitosan composite I comprises the following steps: (1) Preparation of polyethylene glycol monomethyl ether grafted chitosan: add 2% chitosan by weight to a formic acid solution with a pH value of 5.5, stir and dissolve, add polyethylene glycol monomethyl ether with a mass fraction of 4% chitosan by weight, stir for 30 minutes, then add 25% chitosan by weight 37% formaldehyde solution, heat to 50°C, stir for 8 hours, place in a dialysis bag and dialyze with deionized water for 3 days, then freeze-dry; wash the freeze-dried product with chloroform, then filter, dissolve the product with 0.1 mol / L hydrochloric acid, place in a dialysis bag and dialyze with deionized water for 4 days, then freeze-dry to obtain polyethylene glycol monomethyl ether grafted chitosan; (2) Preparation of nanosilver solution: deionized water, 1.2% by weight of silver nitrate, and 100% by weight of polyethylene glycol were added to a reaction kettle, and after thorough mixing, the reaction kettle was sealed, and the temperature was raised to 160° C. for reaction for 3 h while stirring, and then cooled to room temperature, and then water was removed by vacuum distillation to obtain a nanosilver solution; (3) Add 40% of the weight of nanosilver solution to the polyethylene glycol monomethyl ether grafted chitosan, and then place it in a ball mill and mix for 3 hours to obtain nanosilver / polyethylene glycol monomethyl ether grafted chitosan composite I.

[0022] The preparation method of nano silver / polyethylene glycol monomethyl ether grafted chitosan complex II comprises the following steps: (1) Preparation of polyethylene glycol monomethyl ether grafted chitosan: add 2% chitosan by weight to a formic acid solution with a pH value of 5.5, stir and dissolve, add polyethylene glycol monomethyl ether with a mass fraction of 4% chitosan by weight, stir for 30 minutes, then add 25% chitosan by weight 37% formaldehyde solution, heat to 50°C, stir for 8 hours, place in a dialysis bag and dialyze with deionized water for 3 days, then freeze-dry; wash the freeze-dried product with chloroform, then filter, dissolve the product with 0.1 mol / L hydrochloric acid, place in a dialysis bag and dialyze with deionized water for 4 days, then freeze-dry to obtain polyethylene glycol monomethyl ether grafted chitosan; (2) Preparation of nanosilver solution: deionized water, 1% by weight of silver nitrate, and 90% by weight of polyethylene glycol were added to a reaction kettle, and after thorough mixing, the reaction kettle was sealed, and the temperature was raised to 170° C. while stirring for 2 h, and then cooled to room temperature, and then water was removed by vacuum distillation to obtain a nanosilver solution; (3) Add 80% of the weight of nanosilver solution to the polyethylene glycol monomethyl ether grafted chitosan, and then place it in a ball mill and mix it for 5 hours to obtain nanosilver / polyethylene glycol monomethyl ether grafted chitosan complex II.

[0023] The preparation method of nano silver / polyethylene glycol monomethyl ether grafted chitosan complex III comprises the following steps: (1) Preparation of polyethylene glycol monomethyl ether grafted chitosan: add 2% chitosan by weight to a formic acid solution with a pH value of 5.5, stir and dissolve, add polyethylene glycol monomethyl ether with a mass fraction of 4% chitosan by weight, stir for 30 minutes, then add 25% chitosan by weight 37% formaldehyde solution, heat to 50°C, stir for 8 hours, place in a dialysis bag and dialyze with deionized water for 3 days, then freeze-dry; wash the freeze-dried product with chloroform, then filter, dissolve the product with 0.1 mol / L hydrochloric acid, place in a dialysis bag and dialyze with deionized water for 4 days, then freeze-dry to obtain polyethylene glycol monomethyl ether grafted chitosan; (2) Preparation of nanosilver solution: deionized water, 1.2% by weight of silver nitrate, and 80% by weight of polyethylene glycol were added to a reaction kettle, and after thorough mixing, the reaction kettle was sealed, and the temperature was raised to 165° C. while stirring for 2.5 h, and then cooled to room temperature, and then water was removed by vacuum distillation to obtain a nanosilver solution; (3) Add 60% of the weight of nanosilver solution to the polyethylene glycol monomethyl ether grafted chitosan, and then place it in a ball mill for mixing for h to obtain nanosilver / polyethylene glycol monomethyl ether grafted chitosan composite III.

[0024] Embodiment 1: A preparation process of fine all-wool knitting yarn, such as Figure 1As shown, it includes the following steps: S1. Prepare modified wool: While stirring, heat 1-ethyl-3-methylimidazolium acetate to 105°C, then while stirring, add 3% by mass of nano-silver / polyethylene glycol monomethyl ether grafted chitosan complex II based on the mass of 1-ethyl-3-methylimidazolium acetate and 0.5% by mass of sodium polyacrylate (molecular weight 8000) based on the mass of 1-ethyl-3-methylimidazolium acetate. Stir and mix for 60 min and perform ultrasonic treatment for 2 h, then cool to 70°C to obtain an ionic liquid treatment solution; Then immerse 90S mercerized Australian wool in the ionic liquid treatment solution. The treatment temperature is 70°C and the treatment time is 25 min; during the immersion treatment, the mass-volume ratio of the ionic liquid treatment solution to 90S mercerized Australian wool is 25 mL:1 g; then perform rolling, then wash with ethanol, then wash with water and dry to obtain modified wool; The process flow chart for the preparation of modified wool is as Figure 2 shown; S2. Card, comb, gill, rove, spin, wind, draw, ply, and steam the modified wool to obtain the delicate all-wool knitting yarn; during carding, mix water, carding oil FX-906, and antistatic agent DK-103 into a mixed solution and spray it on the modified wool, then place it at room temperature for 28 h. The dosage of water accounts for 6% of the total amount of modified wool, the dosage of carding oil accounts for 1.2% of the total amount of modified wool, and the dosage of antistatic agent accounts for 0.25% of the total amount of modified wool; During combing, gilling, roving, and spinning, control the relative humidity at 65 - 70% and the temperature at 25 - 28°C.

[0025] Example 2: A preparation process for a delicate all-wool knitting yarn, as Figure 1 shown, includes the following steps: S1. Prepare modified wool: While stirring, heat 1-ethyl-3-methylimidazolium acetate to 105°C, then while stirring, add 2% by mass of nano-silver / polyethylene glycol monomethyl ether grafted chitosan complex I based on the mass of 1-ethyl-3-methylimidazolium acetate and 0.5% by mass of sodium polyacrylate (molecular weight 8000) based on the mass of 1-ethyl-3-methylimidazolium acetate. Stir and mix for 90 min and perform ultrasonic treatment for 1 h, then cool to 70°C to obtain an ionic liquid treatment solution; Then immerse 90S mercerized Australian wool in the ionic liquid treatment solution. The treatment temperature is 70°C and the treatment time is 35 min; during the immersion treatment, the mass-volume ratio of the ionic liquid treatment solution to 90S mercerized Australian wool is 20 mL:1 g; then perform rolling, then wash with ethanol, then wash with water and dry to obtain modified wool; S2. Carry out wool mixing, carding, gilling, roving, spinning, winding, doubling, twisting, and yarn steaming on the modified wool to obtain the delicate all-wool knitting yarn; during wool mixing, mix water, wool lubricant FX-906, and antistatic agent DK-103 into a mixed solution and spray it on the modified wool, then leave it at room temperature for 28 h. The amount of water used accounts for 6% of the total amount of modified wool, the amount of wool lubricant used accounts for 1.2% of the total amount of modified wool, and the amount of antistatic agent used accounts for 0.25% of the total amount of modified wool. During carding, gilling, roving, and spinning, control the relative humidity at 65 - 70% and the temperature at 22 - 25 °C.

[0026] Example 3: A preparation process for delicate all-wool knitting yarn, as Figure 1 shown, includes the following steps: S1. Prepare modified wool: Heat 1-ethyl-3-methylimidazolium acetate to 100 °C while stirring, then add 2% by mass of nano-silver / polyethylene glycol monomethyl ether grafted chitosan complex III and 1% by mass of sodium polyacrylate (molecular weight 8000) of 1-ethyl-3-methylimidazolium acetate while stirring, stir and mix for 80 min and perform ultrasonic treatment for 1.5 h, then cool to 68 °C to obtain an ionic liquid treatment solution; Then immerse 90S mercerized Australian wool in the ionic liquid treatment solution. The treatment temperature is 68 °C and the treatment time is 25 min; during the immersion treatment, the mass-volume ratio of the ionic liquid treatment solution to 90S mercerized Australian wool is 15 mL:1 g; then perform rolling, then wash with ethanol, then wash with water and dry to obtain modified wool; S2. Carry out wool mixing, carding, gilling, roving, spinning, winding, doubling, twisting, and yarn steaming on the modified wool to obtain the delicate all-wool knitting yarn; during wool mixing, mix water, wool lubricant FX-906, and antistatic agent DK-103 into a mixed solution and spray it on the modified wool, then leave it at room temperature for 28 h. The amount of water used accounts for 6% of the total amount of modified wool, the amount of wool lubricant used accounts for 1.2% of the total amount of modified wool, and the amount of antistatic agent used accounts for 0.25% of the total amount of modified wool. During carding, gilling, roving, and spinning, control the relative humidity at 65 - 70% and the temperature at 25 - 28 °C.

[0027] Example 4: A preparation process for delicate all-wool knitting yarn, as Figure 1 shown, includes the following steps: S1. Preparation of modified wool: Stir and heat 1-ethyl-3-methylimidazolium acetate to 102 °C, then add 1.5% of silver nanoparticles / polyethylene glycol monomethyl ether grafted chitosan complex Ⅰ and 0.7% of sodium polyacrylate (with a molecular weight of 8000) based on the mass of 1-ethyl-3-methylimidazolium acetate while stirring. Stir and mix for 80 min and ultrasonically treat for 2 h, then cool to 65 °C to obtain an ionic liquid treatment solution. Then immerse 90S mercerized Australian wool in the ionic liquid treatment solution at a treatment temperature of 65 °C for 35 min. The mass-volume ratio of the ionic liquid treatment solution to 90S mercerized Australian wool during the immersion treatment is 25 mL:1 g. Then perform rolling, followed by washing with ethanol, then water washing and drying to obtain modified wool. S2. Card, comb, gill box, roving, spinning, winding, doubling, twisting, and steaming the modified wool to obtain the delicate all-wool knitted yarn. During carding, mix water, carding oil FX-906, and antistatic agent DK-103 into a mixed solution and spray it on the modified wool, then leave it at room temperature for 28 h. The amount of water used accounts for 6% of the total amount of modified wool, the amount of carding oil used accounts for 1.2% of the total amount of modified wool, and the amount of antistatic agent used accounts for 0.25% of the total amount of modified wool. Control the relative humidity at 65 - 70% and the temperature at 22 - 25 °C during combing, gill box, roving, and spinning.

[0028] Example 5: A preparation process of delicate all-wool knitted yarn, which is different from Example 4 in that 1-ethyl-3-methylimidazolium acetate is replaced by 1-butyl-3-methylimidazolium acetate.

[0029] Example 6: A preparation process of delicate all-wool knitted yarn, which is different from Example 4 in that 1-ethyl-3-methylimidazolium acetate is replaced by 1-butyl-3-methylimidazolium tetrafluoroborate.

[0030] Comparative Example 1: A preparation process of delicate all-wool knitted yarn, which is different from Example 4 in that when preparing the ionic liquid treatment solution, silver nanoparticles / polyethylene glycol monomethyl ether grafted chitosan complex Ⅰ is replaced by silver nanoparticles / chitosan complex. The preparation method of the silver nanoparticles / chitosan complex includes the following steps: The preparation method of silver nanoparticles / polyethylene glycol monomethyl ether grafted chitosan complex Ⅰ includes the following steps: (1) Preparing a nanosilver solution: deionized water, 1.2% by weight of silver nitrate, and 100% by weight of polyethylene glycol were added to a reaction kettle, and after thorough mixing, the reaction kettle was sealed, and the temperature was raised to 160° C. for reaction for 3 h while stirring, and then cooled to room temperature, and then water was removed by vacuum distillation to obtain a nanosilver solution; (2) Add 40% of the mass of nanosilver solution to chitosan, and then place it in a ball mill and mix it for 3 hours to obtain a nanosilver / chitosan composite.

[0031] Comparative Example 2: A preparation process of fine all-wool knitting yarn, which is different from Example 4 in that when preparing the ionic liquid treatment solution, the nanosilver / polyethylene glycol monomethyl ether grafted chitosan complex I is replaced by the polyethylene glycol monomethyl ether grafted chitosan complex.

[0032] Comparative Example 3: A preparation process of fine all-wool knitting yarn, which is different from Example 4 in that when preparing the ionic liquid treatment solution, the nano-silver / polyethylene glycol monomethyl ether grafted chitosan complex I is replaced with a mixture of nano-silver and polyethylene glycol monomethyl ether grafted chitosan, and the preparation method of the mixture of nano-silver and polyethylene glycol monomethyl ether grafted chitosan comprises the following steps: 0.3% by weight of nanosilver particles (particle size of 50-200 nm) were added to the polyethylene glycol monomethyl ether grafted chitosan, and then mixed in a ball mill for 3 hours to obtain a mixture of nanosilver and polyethylene glycol monomethyl ether grafted chitosan.

[0033] Comparative Example 4: A preparation process for fine all-wool knitting yarn, which is different from Example 4 in that the ionic liquid treatment solution is different. The preparation method of the ionic liquid treatment solution in this comparative example comprises the following steps: heating 1-ethyl-3-methylimidazole acetate to 102° C. while stirring, then adding 0.7% of the mass of 1-ethyl-3-methylimidazole acetate sodium polyacrylate (molecular weight 8000) while stirring, stirring and mixing for 80 minutes and ultrasonically treating for 2 hours, and then cooling to 65° C. to obtain the ionic liquid treatment solution.

[0034] Comparative Example 5: A preparation process for fine all-wool knitting yarn, which is different from Example 4 in that the ionic liquid treatment solution is different. The preparation method of the ionic liquid treatment solution in this comparative example comprises the following steps: heating 1-ethyl-3-methylimidazole acetate to 102° C. while stirring, then adding 1.5% of the mass of 1-ethyl-3-methylimidazole acetate nanosilver / polyethylene glycol monomethyl ether grafted chitosan complex I while stirring, stirring and mixing for 80 minutes and ultrasonically treating for 2 hours, and then cooling to 65° C. to obtain the ionic liquid treatment solution.

[0035] Comparative Example 6: A preparation process of a delicate all-wool knitted yarn, which is different from Example 4 in that the ionic liquid treatment liquid is replaced by 1-ethyl-3-methylimidazolium acetate.

[0036] Test the coefficient of variation of the strength and the breaking strength of the all-wool knitted yarns in Examples 1-6 and Comparative Examples 1-6, and refer to GB / T 20944.3—2008 "Textiles - Evaluation of antibacterial properties - Part 3: Oscillation method" to test the antibacterial properties of the all-wool knitted yarns. The test results are shown in Table 1. Among them, the coefficient of variation of strength is a statistical index to measure the uniformity of yarn strength. The lower the coefficient of variation of strength, the more uniform the yarn strength.

[0037] Table 1: Coefficient of strong variation / % Yarn breaking strength cN / tex Inhibitory rate against Escherichia coli / % Inhibitory rate against Staphylococcus aureus / % Example 1 2.78 393 95.6 94.6 Example 2 2.87 389 94.6 93.8 Example 3 2.95 385 95.0 94.4 Example 4 3.05 383 94.1 93.2 Example 5 3.08 382 93.8 93.3 Example 6 3.19 379 93.5 92.6 Comparative Example 1 3.82 358 93.0 91.1 Comparative Example 2 3.57 347 80.7 80.0 Comparative Example 3 3.36 369 91.2 91.0 Comparative Example 4 5.23 335 67.8 65.5 Comparative Example 5 4.05 360 92.3 91.7 Comparative Example 6 6.28 330 65.2 62.5

[0038] As can be seen from Table 1 above, the all-wool knitted yarn prepared by the present invention has a low coefficient of variation of strength, strong uniformity of yarn strength, and excellent antibacterial properties at the same time.

[0039] As can be seen from the comparison between Example 4 and Comparative Example 1, grafting chitosan with polyethylene glycol monomethyl ether plays a relatively obvious positive role in improving the uniformity and strength of the all-wool knitted yarn.

[0040] As can be seen from the comparison between Example 4 and Comparative Example 2, the composite of the nano-silver liquid of the present invention and polyethylene glycol monomethyl ether grafted chitosan plays a relatively obvious positive role in improving the uniformity, strength, and antibacterial property of the all-wool knitted yarn.

[0041] As can be seen from the comparison between Example 4 and Comparative Example 3, compared with directly mixing nano-silver particles with polyethylene glycol monomethyl ether grafted chitosan, mixing the nano-silver liquid of the present invention with polyethylene glycol monomethyl ether grafted chitosan plays a slightly obvious positive role in improving the uniformity and strength of the all-wool knitted yarn.

[0042] As can be seen from the comparison between Example 4 and Comparative Example 4, adding the nano-silver / polyethylene glycol monomethyl ether grafted chitosan complex to the ionic liquid treatment liquid plays an obvious positive role in improving the uniformity, strength, and antibacterial property of the all-wool knitted yarn.

[0043] As can be seen from the comparison between Example 4 and Comparative Example 5, adding sodium polyacrylate to the ionic liquid treatment liquid plays an obvious positive role in improving the uniformity and strength of the all-wool knitted yarn.

[0044] It can be seen from the comparison between Example 4 and Comparative Example 6 that adding nano-silver / methoxypolyethylene glycol grafted chitosan complex and sodium polyacrylate to the ionic liquid treatment solution plays an obvious positive role in improving the yarn strength uniformity, strength and antibacterial property of all-wool knitted yarns.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A preparation process for a delicate all-wool knitted yarn, characterized in that, The following steps are involved: S1. preparing modified wool: mixing nanosilver / polyethylene glycol monomethyl ether grafted chitosan complex, sodium polyacrylate and ionic liquid to prepare ionic liquid treatment solution; then immersing the wool in the ionic liquid treatment solution, rolling and pressing, then washing with ethanol, and then washing with water and drying to obtain modified wool; S2, the modified wool is subjected to wool blending, combing, needle combing, roving, spun yarn, bobbin winding, doubling, doubling, and steaming to obtain the fine all-wool knitting yarn.

2. The preparation process of the delicate all-wool knitting yarn according to claim 1, characterized in that, The nano silver / polyethylene glycol monomethyl ether grafted chitosan complex accounts for 1.5-3% of the mass of the ionic liquid; the sodium polyacrylate accounts for 0.5-1% of the mass of the ionic liquid, and the molecular weight of the sodium polyacrylate is 6000-8000.

3. The preparation process of the delicate all-wool knitting yarn according to claim 1, characterized in that, During the immersion treatment, the treatment temperature is 65-70° C. and the treatment time is 25-35 min. During the immersion treatment, the mass volume ratio of the ionic liquid treatment solution to the wool is 15-25 mL:1 g.

4. The preparation process of the delicate all-wool knitting yarn according to claim 1, characterized in that, The method for preparing the ionic liquid treatment solution comprises the following steps: The ionic liquid is heated to 100-105° C. while stirring, and then the nanosilver / polyethylene glycol monomethyl ether grafted chitosan complex and sodium polyacrylate are added while stirring, and the mixture is stirred for 60-90 minutes and ultrasonically treated for 1-2 hours, and then cooled to 65-70° C. to obtain an ionic liquid treatment solution.

5. The preparation process of the delicate all-wool knitting yarn according to claim 1, characterized in that, The ionic liquid is at least one of 1-butyl-3-methylimidazolium tetrafluoroborate, 1,2-dimethyl-3-ethylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium acetate, and 1-butyl-3-methylimidazolium acetate.

6. The preparation process of the delicate all-wool knitting yarn according to claim 5, characterized in that, The ionic liquid is at least one of 1-ethyl-3-methylimidazolium acetate and 1-butyl-3-methylimidazolium acetate.

7. The preparation process of the delicate all-wool knitted yarn according to claim 1, characterized in that The preparation method of the nano silver / polyethylene glycol monomethyl ether grafted chitosan composite comprises the following steps: Deionized water, 1-1.2% by weight of silver nitrate, and 80-100% by weight of polyethylene glycol are added to a reaction kettle, wherein the molecular weight of the polyethylene glycol is 600-800; after being fully mixed, the reaction kettle is sealed, and the temperature is raised to 160-170° C. while stirring for 2-3 hours, and then cooled to room temperature, and then water is removed by vacuum distillation to obtain a nano silver solution; 40-80% of the weight of nanosilver solution was added to the polyethylene glycol monomethyl ether grafted chitosan, and then the mixture was placed in a ball mill and mixed for 3-5 hours to obtain a nanosilver / polyethylene glycol monomethyl ether grafted chitosan composite.

8. The preparation process of the delicate all-wool knitting yarn according to claim 7, characterized in that, The polyethylene glycol monomethyl ether grafted chitosan is prepared by grafting polyethylene glycol monomethyl ether onto chitosan through a formaldehyde connection method.

9. The preparation process of the delicate all-wool knitting yarn according to claim 1, characterized in that, When mixing the wool, water, wool oil and antistatic agent are mixed into a mixed solution and sprayed on the modified wool, and then placed at room temperature for 24-32 hours, and the amount of water accounts for 5-7% of the total amount of the modified wool, the water temperature is controlled at 40-45°C, the amount of wool oil accounts for 1-1.5% of the total amount of the modified wool, and the amount of antistatic agent accounts for 0.2-0.3% of the total amount of the modified wool; Control the relative humidity at 65 - 70% and the temperature at 22 - 28°C during the processes of carding, gilling, roving, and spinning.

10. A delicate all - wool knitted yarn prepared by the preparation process according to any one of claims 1 - 9.

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