A blended yarn of wool and recycled nylon from fishing nets and its preparation method

Abstract

This application relates to the field of blended yarns, and specifically discloses a blended yarn of wool and recycled nylon from fishing nets and a preparation method thereof. The preparation method of the blended yarn of wool and recycled nylon from fishing nets includes: selecting the following raw materials by mass percentage: 30 - 80% of Merino superfine wool, 20 - 70% of recycled nylon, and 0 - 30% of additional fiber, wherein the recycled nylon is recycled nylon from fishing nets modified with polyurethane / nano mica powder; blending and carding the above raw materials 3 - 4 times, and then performing combing, gilling, roving, spinning, winding, doubling twisting, skein dyeing, drying, and waxing to obtain the blended yarn of wool and recycled nylon from fishing nets. The blended yarn of wool and recycled nylon from fishing nets in this application has the advantages of being green and environmentally friendly, having good hygroscopicity, and good anti-pilling performance, and its preparation method has the advantages of enhancing the strength and anti-pilling performance of the blended yarn.

Description

Technical Field

[0001] The present application relates to the field of blended yarns, and more specifically, to a blended yarn of wool and recycled nylon from fishing nets and a preparation method thereof. Background Art

[0002] With the development of marine resources, marine pollution has become increasingly serious. A large number of wastes, such as fishing nets, are discarded in the sea, affecting the marine ecosystem. Recycling and reusing wastes such as fishing nets can not only reuse resources but also protect marine organisms and the marine environment.

[0003] Nylon is the main raw material of fishing nets. Waste fishing nets are often crushed and extruded into pellets to make recycled nylon fibers for reuse. However, due to the limited toughness and weavability of recycled nylon fibers, the application of recycled nylon fibers in the field of clothing textiles is relatively less.

[0004] In view of the above related technologies, the present application provides a blended yarn of wool and recycled nylon from fishing nets and a preparation method thereof. Summary of the Invention

[0005] In order to obtain a green and environmentally friendly blended yarn, the present application provides a blended yarn of wool and recycled nylon from fishing nets and a preparation method thereof.

[0006] In a first aspect, the present application provides a preparation method of a blended yarn of wool and recycled nylon from fishing nets, adopting the following technical scheme:

[0007] A preparation method of a blended yarn of wool and recycled nylon from fishing nets includes the following steps

[0008] Select the following raw materials by mass percentage: 30 - 80% of Merino superfine wool, 20 - 70% of recycled nylon, and 0 - 30% of additional fiber;

[0009] Blend and card the above raw materials 3 - 4 times, and then perform combing to remove impurities, wool grains and other defects in the raw materials to obtain a combed top with uniform sliver;

[0010] Pass the above top through gilling, roving, spinning, winding, and doubling twisting to obtain a blended yarn;

[0011] Perform skein dyeing, drying, and waxing on the blended yarn to obtain a blended yarn of wool and recycled nylon from fishing nets;

[0012] The recycled nylon is recycled nylon from fishing nets modified with polyurethane / nano mica powder.

[0013] By adopting the above technical solution, Merino superfine wool has excellent spinning performance, high spinnable count, soft and elastic hand feeling. Recycling nylon is blended with Merino superfine wool, and additional fibers are added to improve the performance of the blended yarn. Then, the technological process is improved, which can improve the weavability of recycled nylon fiber, apply recycled nylon to the textile field, improve the environmental performance of the blended yarn, and make the obtained blended yarn comfortable to the touch, with high strength, even yarn evenness, and high pilling resistance;

[0014] The drawing-in step can achieve uniform mixing of various fibers. Through 3-4 times of drawing-in, recycled nylon, wool and additional fibers are evenly mixed to improve the yarn evenness; the combing and gilling steps can remove impurities such as neps in the sliver, draft and comb the fiber sliver, and further fully mix recycled nylon, wool and additional fibers; through the roving step, the sliver under gilling is further drafted to make a finer roving sliver. The spinning can draft and twist the roving sliver into a semi-finished yarn, and at the same time can improve the toughness of the fiber sliver. Then, through the winding step, harmful hairiness, foreign fibers, thick and thin places, etc. are cut off, reducing the possibility of pilling of the sliver; the doubling and twisting step can make the blended yarn more stable, and at the same time improve the strength of the blended yarn, further enhancing the pilling resistance; by waxing, the burrs of the blended yarn are laid down on the yarn, enhancing the pilling resistance and weavability of the blended yarn;

[0015] The recycled nylon from fishing nets has poor flexibility and low hygroscopicity. Modifying the recycled nylon from fishing nets with polyurethane / nano mica powder can, on the one hand, improve the softness and toughness of the recycled nylon, improve the weavability, and help improve the hygroscopicity of the recycled nylon, thereby improving the wearing comfort of the blended yarn; on the other hand, it is beneficial to enhance the cohesion performance of the blended yarn, improve the pilling resistance of the blended yarn, and is beneficial to improve the wearing effect of the blended yarn.

[0016] In a specific feasible embodiment, the modification operation of the recycled nylon includes the following steps:

[0017] Immerse the recycled nylon from fishing nets in a 20%-30% formic acid solution at a bath ratio of 1:100, impregnate for 24-48 h, filter out and dry;

[0018] Mix polyether diol and diisocyanate and react to obtain a polyurethane prepolymer;

[0019] Dissolve the polyurethane prepolymer and chain extender in an organic solvent, immerse the formic acid-treated recycled nylon from fishing nets in it at a bath ratio of 1:10, react at 70-120 °C for 60-120 min, filter out and bake to obtain polyurethane-grafted recycled nylon;

[0020] Add a silane coupling agent to an ethanol solution with a concentration of 95% to make a coupling agent solution with a concentration of 3-6 wt%. Add nano mica powder to it, adjust the pH to 3.5-5, impregnate for 20-30 min, filter, wash, and dry to obtain modified nano mica powder;

[0021] Add the modified nano mica powder to an ethanol solution with a concentration of 95%, disperse it evenly, and adjust the pH to 3.5-5 to obtain an impregnating solution, where the mass percentage of nano mica powder is 0.1-2%;

[0022] Immerse the polyurethane grafted recycled nylon in the impregnating solution according to a bath ratio of 1:10. After impregnating for 1-3 h, filter, wash, and dry to obtain modified recycled nylon.

[0023] By adopting the above technical scheme, there are certain terminal amino groups and terminal hydroxyl groups on the surface of the fishing net recycled nylon. The fishing net recycled nylon is swollen and activated by impregnation with a formic acid solution to increase the number of surface active groups such as terminal amino groups and enhance the reactivity of the fishing net recycled nylon; under the action of a chain extender, the polyurethane prepolymer undergoes a chain extension reaction and reacts with the terminal amino groups on the surface of the fishing net recycled nylon through isocyanate groups to be grafted onto the fishing net recycled nylon; the grafting and coating of polyurethane on the fishing net recycled nylon is beneficial to improving the softness and toughness of the fishing net recycled nylon fibers, making the recycled nylon fibers easy to blend and improving the weavability; at the same time, it also improves the dyeability and hygroscopicity of the recycled nylon, which is beneficial to improving the dyeability of the blended yarn, making the blended yarn more likely to adsorb the dyeing agent during the skein dyeing step, improving the dyeing uniformity of the blended yarn, and being beneficial to improving the hygroscopicity of the blended yarn and the wearing comfort of the blended yarn;

[0024] The surface of the nano mica powder is modified by a silane coupling agent, so that the coupling agent molecules are grafted onto the nano mica powder. Then, the recycled nylon is dispersed in the impregnating solution. The coupling agent molecules on the nano mica powder can combine with the polyurethane to couple the nano mica powder and the polyurethane, so that the nano mica powder is indirectly attached to the recycled nylon;

[0025] The lamellar nano mica powder adheres to the surface of the recycled nylon fibers. On the one hand, it enhances the corrosion resistance, insulation property, and high-temperature resistance of the recycled nylon. On the other hand, it increases the wear resistance, surface friction coefficient, and specific surface area of the recycled nylon, enhances the mechanical force between the recycled nylon fibers and wool fibers and external fibers during the blending process, is beneficial to enhancing the cohesion performance of the blended yarn, reduces the possibility of wool slipping out of the blended yarn to form fuzz during the wearing or washing process of the blended yarn, and further reduces the possibility of fuzz entangling with each other to form pills during the wearing process, that is, it is beneficial to improving the pilling resistance of the blended yarn;

[0026] Controlling the mass percentage range of nano mica powder in the impregnating solution to be 0.1 - 2% can endow the blended yarn with better pilling resistance performance while reducing the possibility of poor hygroscopicity caused by excessive consumption of active groups on the surface of polyurethane grafted recycled nylon by coupling agent molecules, making the blended yarn have better wearing comfort.

[0027] Preferably, the polyether diol is polytetrahydrofuran ether diol.

[0028] Preferably, the diisocyanate is selected from one or a combination of diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate.

[0029] Preferably, the chain extender is selected from one or a combination of 1,4 - butanediol, ethylene glycol, 1,6 - hexanediol toluene diamine, triethanolamine, diethanolamine, triisopropanolamine, methyldiethanolamine, adipic acid, terephthalic acid, isophthalic acid.

[0030] Preferably, the organic solvent is selected from one or a combination of N,N - dimethylacetamide, N,N - dimethylformamide, N - methylpyrrolidone.

[0031] Preferably, the specification of the fishing net recycled nylon is 2.5 dtex - 3.9 dtex, 88 mmH; the specification of the Merino superfine wool is 17.5 mic - 19.3 mic, 58 mmH - 70 mmH.

[0032] Preferably, the additional fiber is selected from one or a combination of Lenzing Tencel, viscose fiber, polyester, acrylic fiber.

[0033] Preferably, the additional fiber is polyester, and the mass percentage of the polyester in the blended yarn is 10 - 30%, and the fineness is 2.2 dtex - 3.3 dtex.

[0034] By adopting the above technical solution, polyester has excellent stretching performance, shrinkage resistance performance, high elastic modulus, high breaking strength, high thermoplasticity, good resilience performance, and stable size. Adding polyester to the blended yarn of wool and fishing net recycled nylon for blending can help improve the dimensional stability of the blended yarn and reduce the possibility of post - shrinkage in water.

[0035] Preferably, the additional fiber needs to be pretreated before the drawing step, including the following steps:

[0036] Dissolve 4.5 - 5 parts by weight of itaconic acid and 0.1 - 0.5 parts by weight of initiator in 45 - 50 parts by weight of water to obtain an additional fiber treatment agent;

[0037] Spray the external fiber treatment agent evenly on the surface of the external fiber, and then treat the external fiber at 30-60°C for 3-8 hours, followed by washing and drying.

[0038] Preferably, the initiator is a persulfide.

[0039] Through the above technical solution, under the action of the initiator, itaconic acid undergoes graft copolymerization on the surface of the external fiber. On the one hand, it is beneficial to improve the dyeing performance, moisture absorption performance and antistatic performance of the external fiber, and thus beneficial to improving the dyeing performance and moisture absorption of the blended yarn. On the other hand, the surface of the external fiber is provided with abundant polar functional groups, which improves the interaction force between the external fibers during the blending process, further improves the cohesion performance of the blended yarn, and enhances the anti-pilling performance of the blended yarn.

[0040] Preferably, in the combing step, the number of fed strands is 18, and the fed gram weight is 2×18 g / m.

[0041] Preferably, the spinning step includes: feeding two rovings into a spinning frame, and drawing and twisting them into a semi-finished yarn.

[0042] Through the above technical solution, the blending process is improved, which is beneficial to enhancing the strength of the yarn, improving the evenness of the yarn, reducing the generation of hairiness, enhancing the anti-pilling performance, and improving the spinnability of the blended yarn.

[0043] Preferably, the spinnable count range of the yarn is 16-80 single or double yarns, and the twist is 330Z-900Z / 180S-600S.

[0044] In the second aspect, the present application provides a blended yarn of wool and recycled nylon from fishing nets, adopting the following technical solution: a blended yarn of wool and recycled nylon from fishing nets is prepared by the preparation method of the above-mentioned blended yarn of wool and recycled nylon from fishing nets.

[0045] By adopting the above technical solution, the blended yarn of wool and recycled nylon from fishing nets has the advantages of high strength, good hand feeling, excellent anti-pilling performance, and is green and recyclable, with environmental protection performance.

[0046] To sum up, the present application has the following beneficial effects:

[0047] 1. The present application applies recycled nylon to the field of blended yarns, enabling full utilization of resources, protecting the marine ecological environment, improving the environmental protection performance of the blended yarns, making the prepared blended yarns recyclable, reducing environmental pollution, reducing energy consumption, and reducing carbon emissions, which is in line with the trend of social development;

[0048] 2. The preparation method of the present application can improve the strength of the blended yarn, improve the evenness of the yarn evenness, enhance the anti-pilling performance, making the obtained blended yarn have good weavability and comfortable hand feeling.

[0049] 3. Before blending, the recycled nylon from fishing nets is modified with polyurethane / nano mica powder. On the one hand, it can improve the softness and toughness of the recycled nylon, improve the weavability, and help improve the moisture absorption of the recycled nylon, thereby improving the wearing comfort of the blended yarn. On the other hand, it is beneficial to enhance the cohesion performance of the blended yarn, improve the anti-pilling performance of the blended yarn, and is conducive to improving the wearing effect of the blended yarn. Specific Embodiments

[0050] The present application will be further described in detail below with reference to the embodiments.

[0051] Preparation Examples

[0052] Preparation Example 1

[0053] This preparation example provides a method for modifying recycled nylon, including the following steps:

[0054] Immerse the recycled nylon from fishing nets in a 20% formic acid solution at a bath ratio of 1:100, filter it out after impregnating for 24 h, wash it three times with water, and dry it.

[0055] Add polytetrahydrofuran ether diol and isophorone diisocyanate to the reaction kettle in a mass ratio of 5:2, and react at 50 °C for 2 h to obtain a polyurethane prepolymer.

[0056] Dissolve the polyurethane prepolymer and triethanolamine in N,N-dimethylacetamide in a mass ratio of 5:1, and the mass of N,N-dimethylacetamide is three times that of the polyurethane prepolymer. Then immerse the formic acid-treated recycled nylon from fishing nets in it according to a bath ratio of 1:10, react at 75 °C for 2 h, filter it out, and bake it to obtain polyurethane-grafted recycled nylon.

[0057] Add a silane coupling agent to an ethanol solution with a concentration of 95% to make a 5 wt% coupling agent solution. Add 20% of nano mica powder based on the mass of the coupling agent solution to it, dropwise add oxalic acid to adjust the pH to 4, impregnate for 30 min, filter it out, wash it, and dry it to obtain modified nano mica powder.

[0058] Add the modified nano mica powder to an ethanol solution with a concentration of 95%, dropwise add oxalic acid to adjust the pH to 4, and ultrasonically disperse it evenly to obtain an impregnating solution.

[0059] Immerse the modified recycled nylon in the impregnating solution according to a bath ratio of 1:10. After impregnating for 2 h, filter it out, wash it three times with an ethanol solution with a concentration of 50%, and dry it to obtain modified recycled nylon.

[0060] In this preparation example, the recycled nylon for fishing nets is commercially available and has a specification of 2.5 dtex and 88 mmH.

[0061] In this preparation example, based on the mass of the impregnating solution, the mass fraction of the nano mica powder is 0.1%; the particle size of the nano mica powder is 350 nm; the model of the silane coupling agent is KH-570.

[0062] Preparation Example 2

[0063] The difference between this preparation example and Preparation Example 1 is only that, based on the mass of the impregnating solution, the mass fraction of the nano mica powder is 0.5%.

[0064] Preparation Example 3

[0065] The difference between this preparation example and Preparation Example 1 is only that, based on the mass of the impregnating solution, the mass fraction of the nano mica powder is 1.5%.

[0066] Preparation Example 4

[0067] The difference between this preparation example and Preparation Example 1 is only that, based on the mass of the impregnating solution, the mass fraction of the nano mica powder is 2%.

[0068] Preparation Example 5

[0069] The difference between this preparation example and Preparation Example 1 is only that, based on the mass of the impregnating solution, the mass fraction of the nano mica powder is 2.5%.

[0070] Preparation Example 6

[0071] The difference between this preparation example and Preparation Example 1 is only that the recycled nylon for fishing nets is not treated by impregnation with formic acid solution.

[0072] Preparation Example 7

[0073] The difference between this preparation example and Preparation Example 1 is only that the recycled nylon is the recycled nylon for fishing nets graft-modified with polyurethane; the modification method is as follows:

[0074] Immerse the recycled nylon for fishing nets in a 20% formic acid solution at a bath ratio of 1:100, filter it out after impregnation for 24 h, wash it three times with water, and dry it;

[0075] Add polytetrahydrofuran ether diol and isophorone diisocyanate to the reaction kettle in a mass ratio of 5:2, and react at 50 °C for 2 h to obtain a polyurethane prepolymer;

[0076] Dissolve the polyurethane prepolymer and triethanolamine in N,N-dimethylacetamide in a mass ratio of 5:1, and the mass of N,N-dimethylacetamide is three times that of the polyurethane prepolymer; then immerse the formic acid-treated recycled nylon for fishing nets in it at a bath ratio of 1:10, react at 75 °C for 2 h, filter it out, and bake it to obtain the modified recycled nylon.

[0077] Preparation Example 8

[0078] The difference between this preparation example and Preparation Example 1 is only that the recycled nylon is the recycled nylon of fishing net coupled and modified with nano mica powder; the modification method is as follows:

[0079] Immerse the recycled nylon of fishing net in 20% formic acid solution at a bath ratio of 1:100, filter it out after impregnation for 24 h, wash it three times with water, and dry it;

[0080] Add silane coupling agent to the ethanol solution with a concentration of 95% to make a 5 wt% coupling agent solution, add nano mica powder accounting for 20% of the mass of the coupling agent solution to it, dropwise add oxalic acid to adjust the pH to 4, impregnate for 30 min, filter it out, wash it, and dry it to obtain modified nano mica powder;

[0081] Add modified nano mica powder to the ethanol solution with a concentration of 95%, dropwise add oxalic acid to adjust the pH to 4, and disperse it evenly by ultrasonic wave to obtain an impregnating solution;

[0082] Immerse the recycled nylon of fishing net after formic acid treatment in the impregnating solution according to a bath ratio of 1:10, filter it out after impregnation for 2 h, wash it three times with 50% ethanol solution, and dry it to obtain modified recycled nylon.

[0083] Preparation Example 9

[0084] This preparation example provides a pretreatment method for external fibers, including the following steps:

[0085] Dissolve 4.5 parts by weight of itaconic acid and 0.5 part by weight of potassium persulfide in 50 parts by weight of water to obtain an external fiber treatment agent; uniformly spray the external fiber treatment agent on the surface of the external fibers, then stack the external fibers in a sealed package at 40 °C for 6 h, wash them 3 times with 50% ethanol solution, and dry them to obtain pretreated external fibers.

[0086] Examples

[0087] Example 1

[0088] This example discloses a blended yarn of wool and recycled nylon of fishing net, and its preparation method includes the following steps:

[0089] Wool selection: Select the following raw materials by mass percentage: 30% of Merino superfine wool and 70% of recycled nylon, wherein the specification of Merino superfine wool is 18 mic, 65 mmH, and the recycled nylon is prepared from Preparation Example 1;

[0090] Drawing: Combine, card, and draw out the Merino superfine wool and recycled nylon fiber sliver; repeat the drawing 3 times;

[0091] Combing: Feed the blended sliver into the comber. The number of fed slivers is 18, and the fed weight per meter is 2×18 g / m. The comber combs out the wool particles in the sliver, further straightening, paralleling, and separating the fibers to produce a combed sliver with uniform evenness;

[0092] Gilling: Further draft, comb, and combine the combed sliver to make the sliver fibers straight and parallel, producing a fiber sliver of a certain thickness;

[0093] Roving: Further draft the sliver from gilling to produce a finer sliver;

[0094] Spinning: Feed 2 rovings into the spinning frame. The spinning frame drafts and twists the roving sliver into a semi-finished yarn;

[0095] Winding: Cut off the harmful hairiness, foreign fibers, thick and thin places, etc. in the semi-finished yarn;

[0096] Doubling and Twisting: Increase the twist of the double-strand yarn after winding on the doubling and twisting machine to make the yarn more stable. The metric count of the single yarn is 60s, and the twist is 690Z / 380S;

[0097] Hank Dyeing: Immerse in the dyeing vat at a liquor ratio of 1:3 for hank dyeing;

[0098] Drying: Put the dyed blended yarn into the oven, control the oven temperature at 70°C for drying;

[0099] Wax the dried blended yarn to obtain a blended yarn of wool and recycled nylon from fishing nets.

[0100] Example 2

[0101] The difference between this example and Example 1 is only that in the wool selection step, the following raw materials are selected by mass percentage: 80% Merino superfine wool, 20% recycled nylon.

[0102] Examples 3 - 7

[0103] Examples 3 - 7 are basically the same as Example 1, the difference being that the recycled nylon is prepared from Preparation Examples 2 - 6.

[0104] Example 8

[0105] The difference between this example and Example 1 is only that in the wool selection step, the following raw materials are selected by mass percentage: 40% Merino superfine wool, 50% recycled nylon, and 10% additional fiber.

[0106] In this example, the additional fiber is recyclable polyester with a fineness of 2.5 dtex.

[0107] Example 9

[0108] The difference between this example and Example 8 is only that in the wool selection step, the following raw materials are selected by mass percentage: 40% Merino superfine wool, 40% recycled nylon, and 20% additional fiber.

[0109] Example 10

[0110] The difference between this example and Example 8 is only that in the wool selection step, the following raw materials are selected by mass percentage: 40% Merino superfine wool, 30% recycled nylon, and 30% additional fiber.

[0111] Example 11

[0112] The difference between this example and Example 8 is only that the additional fiber is Lenzing Tencel with a fineness of 1.4 dtex.

[0113] Example 12

[0114] The difference between this example and Example 8 is only that the additional fiber is acrylic fiber with a fineness of 2.5 dtex.

[0115] Example 13

[0116] The difference between this example and Example 8 is only that before drawing, the polyester is pretreated by the method of Preparation Example 9.

[0117] Comparative Example

[0118] Comparative Example 1

[0119] The difference between this comparative example and Example 1 is only that in the wool selection step, the following raw materials are selected by mass percentage: 20% Merino superfine wool and 80% recycled nylon.

[0120] Comparative Example 2

[0121] The difference between this comparative example and Example 1 is only that the recycled nylon is recycled fishing net nylon without modification treatment.

[0122] Comparative Example 3

[0123] The difference between this comparative example and Example 1 is only that the recycled nylon is prepared by Preparation Example 7.

[0124] Comparative Example 4

[0125] The difference between this comparative example and Example 1 is only that the recycled nylon is prepared by Preparation Example 8.

[0126] Performance Detection Test Test 1: Pilling Resistance Performance: Refer to the standard GB / T 4802.3-2008 to detect the pilling resistance performance of the wool and recycled fishing net nylon blended yarns prepared in each example and comparative example;

[0127] Test 2: Hygroscopicity: Refer to the standard GB / T 21655.1-2008 to detect the water absorption rate of the wool and recycled fishing net nylon blended yarns prepared in each example and comparative example.

[0128] Test 3: Tensile strength: Refer to the standard GB / T 3916 to detect the tensile strength of the wool and recycled fishing net nylon blended yarns prepared in each example and comparative example. The test conditions are: applying a 10 cN pre-tension, a gripping distance of 500 mm, and a stretching speed of 500 mm / min.

[0129] The test results are summarized in Table 1.

[0130] Table 1

[0131] Pilling resistance grade Water absorption rate (%) Breaking strength (cN / tex) Example 1 3.5 248 16.40 Example 2 3 285 14.15 Example 3 4 231 16.95 Example 4 4 218 17.10 Example 5 4 182 17.15 Example 6 4 125 17.30 Example 7 3.5 206 15.35 Example 8 3.5 255 17.20 Example 9 3.5 267 18.25 Example 10 3.5 281 19.50 Example 11 3 256 16.85 Example 12 2 309 16.05 Example 13 4 347 19.30 Comparative Example 1 3.5 99 17.20 Comparative Example 2 3 107 12.75 Comparative Example 3 3 274 15.85 Comparative Example 4 3.5 86 14.60

[0132] Combined with Examples 1-2 and Table 1, it can be seen that by referring to the preparation method disclosed in the present application to prepare the wool and recycled fishing net nylon blended yarns, the blended yarns can be given better strength and pilling resistance. In the present application, the evenness of the yarn is improved by multiple blending, which is beneficial to improving the strength of the blended yarns. Through processes such as spinning, winding, and doubling twisting, the strength of the yarn is effectively improved, the evenness is improved, the generation of hairiness is reduced, and the pilling resistance of the blended yarns is enhanced. At the same time, combined with Comparative Example 1, it can be seen that when the amount of Merino superfine wool is too small, the hygroscopicity of the blended yarns is poor; when the amount of recycled nylon is too small, the environmental protection effect of the blended yarns is limited. Therefore, by selecting wool and recycled nylon for blending within the scope disclosed in the present application, blended yarns with good hygroscopicity and environmental friendliness can be obtained.

[0133] Combined with Example 1 and Comparative Examples 2-4 and Table 1, it can be seen that only using polyurethane to graft-modify the recycled fishing net nylon, the pilling resistance of the blended yarns is poor, and the hygroscopicity is significantly improved; only using nano-mica to couple-modify the recycled fishing net nylon, the pilling resistance of the blended yarns is improved to some extent, while the hygroscopicity is poor. This may be because the coupling agent molecules on the nano-mica powder consume the hydrophilic active groups on the recycled fishing net nylon, reducing the hygroscopicity of the recycled fishing net nylon.

[0134] Modifying the recycled fishing net nylon with polyurethane / nano-mica powder can improve the pilling resistance and hygroscopicity of the blended yarns. This may be because the graft coating of polyurethane makes the hydrophilic groups on the surface of the recycled nylon more abundant, improving the hygroscopicity, and at the same time being beneficial to improving the toughness of the recycled nylon and increasing the tensile strength of the blended yarns; the coupling attachment of nano-mica powder on the surface of the recycled nylon can increase the surface friction and specific surface area of the recycled nylon, enhancing the cohesion performance of the blended yarns, and thus being beneficial to enhancing the pilling resistance.

[0135] Combined with Example 1, Examples 3 - 6 and Table 1, it can be seen that the increase in the adhesion amount of nano - mica powder can enhance the anti - pilling performance of recycled nylon. At the same time, nano - mica powder is coupled with the polyurethane on recycled nylon through a silane coupling agent, consuming the active hydrophilic groups, which reduces the hygroscopicity of the blended yarn. When too much nano - mica powder adheres, it will affect the weavability and hand feeling of recycled nylon. At the same time, the excessive consumption of hydrophilic groups on the surface of recycled nylon will result in insufficient hygroscopicity of the blended yarn. Therefore, pretreating recycled nylon within the scope disclosed in this application can endow recycled nylon with better hygroscopicity, hand feeling, weavability, and excellent anti - pilling property.

[0136] Combined with Example 1 and Example 7 and Table 1, it can be seen that recycled nylon after being impregnated with formic acid solution can endow the blended yarn with better hygroscopic performance and breaking strength. This may be because the impregnation treatment with formic acid solution can activate the recycled nylon from fishing nets, promote the exposure of active groups on the surface of the recycled nylon from fishing nets, and then is conducive to improving the grafting rate of polyurethane, promoting the improvement of the hygroscopicity and toughness of recycled nylon.

[0137] Combined with Example 1, Examples 8 - 12 and Table 1, it can be seen that adding external fibers for blending is beneficial to improving the breaking strength of the blended yarn, and at the same time is beneficial to improving the hand feeling, weavability, etc. of the blended yarn. Selecting polyester as the external fiber can be conducive to improving the breaking strength of the blended yarn and at the same time can improve the dimensional stability and resilience of the blended yarn; Lenzing Tencel can endow the blended yarn with better hand feeling, but its anti - pilling performance is not good. Acrylic fiber can endow the blended yarn with better hygroscopicity and softness, etc., but it is easy to pill.

[0138] Combined with Example 1 and Example 13 and Table 1, it can be seen that pretreating polyester by grafting modification with itaconic acid can enhance the toughness of polyester, further improve the breaking strength of the blended yarn, and at the same time is beneficial to improving the water absorption and dyeing performance of the blended yarn.

[0139] This specific embodiment is only an interpretation of this application, and it does not limit this application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of this application, it is protected by the patent law.

Claims

1. A method for preparing a blended yarn of wool and recycled nylon from fishing nets, characterized in that, It includes the following steps: Select the following raw materials by mass percentage: 30 - 80% of merino superfine wool, 20 - 70% of recycled nylon, and 0 - 30% of additional fiber; Blend and card the above raw materials 3 - 4 times, and then perform combing to remove impurities, wool grains and other defects in the raw materials, obtaining a combed top with uniform evenness; Pass the above top through gilling, roving, spinning, winding, and doubling twisting to obtain a blended yarn; Dye, dry, and wax the blended yarn to obtain a blended yarn of wool and recycled nylon from fishing nets; The recycled nylon is recycled nylon from fishing nets modified with polyurethane and nano mica powder; The modification operation of the recycled nylon includes the following steps: Immerse the recycled nylon from fishing nets in a 20% - 30% formic acid solution at a bath ratio of 1:100, impregnate for 24 - 48 h, filter out, and dry; Mix and react polyether diol and diisocyanate to obtain a polyurethane prepolymer; Dissolve the polyurethane prepolymer and chain extender in an organic solvent, immerse the formic acid - treated recycled nylon from fishing nets in it at a bath ratio of 1:10, react at 70 - 120 °C for 60 - 120 min, filter out, and bake to obtain polyurethane - grafted recycled nylon; Add a silane coupling agent to an ethanol solution with a concentration of 95% to make a coupling agent solution with a concentration of 3 - 6 wt%, add nano mica powder to it, adjust the pH to 3.5 - 5, impregnate for 20 - 30 min, filter out, wash, and dry to obtain modified nano mica powder; Add the modified nano mica powder to an ethanol solution with a concentration of 95%, disperse evenly, adjust the pH to 3.5 - 5 to obtain an impregnating solution, where the mass percentage of nano mica powder is 0.1 - 2%; Immerse the polyurethane - grafted recycled nylon in the impregnating solution at a bath ratio of 1:10, after impregnating for 1 - 3 h, filter out, wash, and dry to obtain modified recycled nylon.

2. The method for preparing a blended yarn of wool and recycled nylon from fishing nets according to claim 1, characterized in that: The specification of the recycled nylon from fishing nets is 2.5 dtex - 3.9 dtex, 88 mmH; the specification of the merino superfine wool is 17.5 mic - 19.3 mic, 58 mmH - 70 mmH.

3. The method for preparing a blended yarn of wool and recycled nylon from fishing nets according to claim 1, characterized in that: The additional fiber is selected from one or a combination of more of Lenzing Tencel, viscose fiber, polyester, and acrylic fiber.

4. The method for preparing a blended yarn of wool and recycled nylon from fishing nets according to claim 3, characterized in that: The additional fiber is polyester, and the mass percentage of the polyester in the blended yarn is 10 - 30%, and the fineness is 2.2 dtex - 3.3 dtex.

5. The method for preparing a blended yarn of wool and recycled nylon from fishing nets according to claim 3, characterized in that: The additional fiber needs to be pretreated before the blending step, including the following steps: Dissolve 4 - 5 parts by weight of itaconic acid and 0.1 - 0.5 parts by weight of an initiator in water to obtain an additional fiber treatment agent, where the mass of water is 2 - 10 times the total amount of itaconic acid and the initiator; Spray the additional fiber treatment agent evenly on the surface of the additional fiber, and then treat the additional fiber at 30 - 60 °C for 3 - 8 h, wash and dry to obtain pretreated additional fiber.

6. The method for preparing a blended yarn of wool and recycled nylon from fishing nets according to claim 1, characterized in that: The spinning step includes: feeding two rovings into a spinning frame, and drafting and twisting them into a semi - finished yarn.

7. The method for preparing a blended yarn of wool and recycled nylon from fishing nets according to claim 1, characterized in that: The spinnable count range of the yarn is 16 - 80 single - or double - ply yarns, and the twist is 330 Z - 900 Z / 180 S - 600 S.

8. A blended yarn of wool and recycled nylon from fishing nets, characterized in that: It is prepared by the preparation method of the blended yarn of wool and recycled nylon from fishing nets according to any one of claims 1 - 7.