Wrapped yarn, preparation method thereof and blended fabric adopting wrapped yarn

Abstract

The invention relates to the field of textile fabric production, in particular to a fasciated yarn, a preparation method thereof and a blended fabric adopting the fasciated yarn. The blended fabric is prepared by weaving fasciated yarns, the fasciated yarns are prepared by blending polyamide fibers and polyester fibers into mixed yarns and then coating the mixed yarns on polyester yarns spun by the polyester fibers; the polyester fiber comprises a film layer formed on the polyester fiber by the dyeing modification impregnation liquid, so that the dyeing performance of the polyester fiber is improved; the dyeing modification impregnation liquid comprises sodium alginate, tannin, calcium chloride, dialdehyde and water-based closed isocyanate; the polyester fiber in the fasciated yarn endows the covering yarn with better shrinkage resistance; the prepared fasciated yarn and the blended fabric prepared from the fasciated yarn have good shrinkage resistance and homochromatism.

Description

Technical Field

[0001] The present application relates to the field of textile fabric production, and in particular to a wrapped yarn and a preparation method thereof, and a blended fabric using the wrapped yarn. Background Art

[0002] Wool fiber is soft, comfortable, warm, and easy to care for, making it very suitable for outerwear fabrics, but wool fiber is prone to shrinkage. In order to overcome the easy shrinkage of pure wool fabrics, polyester fibers are often appropriately added to improve the dimensional stability of the fabrics, and the addition of nylon can improve the wear resistance and resilience of wool fabrics. However, wool and nylon have good dyeing homochromaticity and bright colors, but polyester has no polar groups that can be combined with conventional dyes in its molecular structure. The dye molecules cannot hydrogen bond with the polymer chains of polyester and can only rely on van der Waals attraction to bind to the fibers. Generally, disperse dyes are required to dye polyester under high temperature and high pressure conditions. In addition, during the washing process of blended fabrics, some relatively small disperse dye molecules will be lost from the surface of polyester fibers. Therefore, existing blended fabrics mixed with wool, nylon and polyester are difficult to achieve good homochromaticity.

[0003] In order to achieve better color homogeneity, existing blended fabrics of wool, nylon and polyester often use polyester as the core yarn, and wool and nylon are wrapped around the surface of the polyester core yarn to prepare a wrapped yarn; in order to make the wool and nylon wrapped more tightly on the surface of the polyester and improve the color homogeneity of the blended fabric, the wool content in the wrapped yarn is generally higher and the polyester content is relatively lower; however, due to the lower polyester content, the shrinkage resistance of the existing blended fabrics of wool, nylon and polyester is not ideal. Summary of the invention

[0004] In order to solve the problem that existing blended fabrics of wool, nylon and polyester are difficult to have both good shrinkage resistance and dyeing homochromaticity, the present application provides a wrapped yarn and a preparation method thereof, and a blended fabric using the wrapped yarn.

[0005] In a first aspect, the present application provides a wrapping yarn: A wrapped yarn comprises 30-65 parts of wool fiber, 5-12 parts of nylon fiber and 17-45 parts of polyester fiber by weight; the nylon fiber and polyester fiber are blended into mixed yarn and then coated on polyester yarn spun from polyester fiber to prepare the wrapped yarn; the polyester fiber comprises a film layer formed by reaction on the polyester fiber after being treated with alkali solution and then with a dyeing modified impregnation liquid; the dyeing modified impregnation liquid comprises sodium alginate, tannin, calcium chloride, dialdehyde and water-based blocked isocyanate.

[0006] By adopting the above technical scheme, the polyester fiber in the wrapped yarn gives the core-spun yarn better anti-shrinkage performance, the wool fiber is soft, comfortable and warm, and the nylon improves the wear resistance and resilience of the wool fiber. By using 30-65 parts of wool fiber, 5-12 parts of nylon fiber and 17-75 parts of polyester fiber, the prepared wrapped yarn is soft, comfortable and warm, and has good anti-shrinkage and wear resistance.

[0007] After the polyester fiber is treated with alkali solution, the hydroxyl and carboxyl groups on the surface of the polyester fiber are increased. Then, after being treated with a dyeing modification impregnation solution, the blocked isocyanate groups in the water-based blocked isocyanate are unblocked under heating conditions, and can react with the hydroxyl groups in tannin and sodium alginate and the hydroxyl or carboxyl groups on the surface of the polyester fiber, so that the tannin and sodium alginate are connected to the polyester fiber to form a film layer; further, the sodium alginate in the dyeing modification solution can react with calcium chloride to further increase the density of the formed film layer; tannin and sodium alginate contain more hydroxyl groups, which can increase the dyeing rate of the dye on the polyester fiber, thereby improving the color homogeneity of the polyester fiber with the wool fiber and the nylon fiber after dyeing, so that the prepared wrapped yarn has good shrinkage resistance and dyeing homogeneity.

[0008] Preferably, the dyeing modified impregnation liquid comprises, based on the weight of the dyeing modified impregnation liquid, 1-3wt% sodium alginate, 3-7wt% calcium chloride, 0.2-10wt% tannin, 10-18wt% aqueous blocked isocyanate and 0.3-1.2wt% dialdehyde; the NCO content in the aqueous blocked isocyanate is 5-6wt%.

[0009] Preferably, the content of sodium alginate is 2wt%, calcium chloride is 5-6wt%, tannin is 5-8wt%, water-based blocked isocyanate is 12-15wt%, and dialdehyde is 1wt%.

[0010] Preferably, the average number average molecular weight of the sodium alginate is 8000-20000; the average number average molecular weight of the water-based blocked isocyanate is 2000-10000; and the average number average molecular weight of the tannin is 500-3000.

[0011] By adopting the above technical scheme, the mass ratio of sodium alginate, tannin, calcium chloride, aqueous blocked isocyanate and dialdehyde is optimized; the molecular weight of sodium alginate, aqueous blocked isocyanate and tannin is optimized, so that the prepared film layer has good dyeing performance, strength and water resistance.

[0012] As the content of sodium alginate increases, the dyeability of the polyester fiber is improved. However, if the content of sodium alginate is too much, the water resistance of the film layer will decrease; as the content of water-based blocked isocyanate increases, the water resistance of the film layer is improved. However, if the content of water-based blocked isocyanate is too much, it is not conducive to dyeing; the dosage of sodium alginate, tannin, calcium chloride, water-based blocked isocyanate and dialdehyde is preferably selected, so that the prepared film layer has good dyeability, strength and water resistance, thereby improving the dyeing homochromaticity of the wrapped yarn.

[0013] Preferably, the wool fiber accounts for 40-55 parts, the nylon fiber accounts for 8-10 parts, and the polyester fiber accounts for 25-60 parts.

[0014] By adopting the above technical scheme, the amount of wool fiber, nylon fiber and polyester fiber is optimized, so that the wrapped yarn has better anti-shrinkage performance and homochromicity.

[0015] The dyeing modified impregnation liquid modifies the dyeing properties of polyester fibers, and the higher content of polyester fibers makes the blended fabric have better shrinkage resistance; in the wrapped yarn, a certain content of wool fibers and nylon fibers are wrapped on the surface of the polyester fibers, reducing the damage to the membrane layer of the polyester fibers during the dyeing process, and further improving the homochromaticity of the wool fibers, nylon fibers and polyester fibers in the wrapped yarn; making the wrapped yarn have better shrinkage resistance and dyeing homochromaticity.

[0016] Preferably, the dyeing modified impregnation solution further comprises 0.6-1.5 wt % of hydroxyl-terminated silicone oil.

[0017] By adopting the above technical scheme, hydroxyl-terminated silicone oil is used in the dyeing modified impregnation liquid. The hydroxyl-terminated silicone oil can reduce the surface energy of the film layer formed by the reaction of the dyeing modified impregnation liquid and improve the softness of the film layer, thereby reducing the damage of the film layer during the dyeing process or after contacting water, and further improving the dyeing homochromaticity of the wool fiber, nylon fiber and polyester fiber in the wrapped yarn after dyeing.

[0018] In a second aspect, the present application provides a method for preparing a wrapped yarn: A method for preparing a wrapped yarn, wherein the mass ratio of the polyester fiber to the dyeing modified impregnation liquid is 1:(20-30); after the polyester fiber is impregnated with the dyeing modified impregnation liquid for 10-24 hours, it is first pre-dried at 25-60°C, and then dried at 100-150°C for 0.5-2 hours.

[0019] Preferably, the concentration of the alkali solution is 6-10 g / L, and the treatment time is 1-3 h.

[0020] By adopting the above technical scheme, the mass ratio of polyester fiber and dyeing modified impregnation liquid, the impregnation treatment time and the reaction temperature are optimized, so that the film layer formed by the dyeing modified impregnation liquid is better attached to the polyester fiber, thereby improving the dyeing homochromaticity of the wrapped yarn.

[0021] In a third aspect, the present application provides a blended fabric: A blended fabric can be a twill, satin or plain weave fabric.

[0022] Preferably, the blended fabric is dyed with reactive dyes.

[0023] By adopting the above technical solution, the prepared blended fabric has good shrinkage resistance and dyeing homochromicity.

[0024] In a third aspect, the present application provides a blended fabric: The utility model relates to a blended fabric, which can be a twill fabric, a satin fabric or a plain weave fabric.

[0025] Preferably, the blended fabric is dyed with reactive dyes.

[0026] By adopting the above technical scheme, the polyester fiber, wool fiber and nylon fiber modified by the dyeing modified impregnation liquid contain rich hydroxyl groups and are easily dyed with reactive dyes, thereby improving the color homogeneity and color fastness to friction of the blended fabric after dyeing, so that the prepared wrapped yarn and blended fabric have good anti-shrinkage performance, dyeing homogeneity and color fastness to friction, and are suitable for making clothing fabrics, especially outerwear fabrics.

[0027] In summary, this application has the following beneficial effects: 1. A blended fabric, prepared by weaving a wrapped yarn; the wrapped yarn is prepared by blending nylon fiber and polyester fiber into a mixed yarn and then covering the polyester yarn spun from polyester fiber; the polyester fiber includes a film layer formed on the polyester fiber by a dyeing modified impregnation liquid, which improves the dyeing performance of the polyester fiber; the dyeing modified impregnation liquid includes sodium alginate, tannin, calcium chloride, dialdehyde and water-based blocked water-based blocked isocyanate; the polyester fiber in the wrapped yarn gives the core-spun yarn better shrinkage resistance; the prepared wrapped yarn and the blended fabric prepared using the wrapped yarn have better shrinkage resistance and same color.

[0028] 2. Optimize the amount of wool fiber, nylon fiber and polyester fiber so that the wrapped yarn has better shrinkage resistance; optimize the mass ratio of sodium alginate, tannin, calcium chloride, water-based blocked isocyanate and dialdehyde; improve the dyeing homochromaticity of wool fiber, nylon fiber and polyester fiber in the wrapped yarn after dyeing; make the wrapped yarn and blended fabrics have better shrinkage resistance and dyeing homochromaticity.

[0029] 3. Preferably, the dyeing modified impregnation liquid also includes hydroxyl-terminated silicone oil; the hydroxyl-terminated silicone oil can reduce the surface energy of the film layer formed by the reaction of the dyeing modified impregnation liquid and improve the flexibility of the film layer, thereby reducing the damage of the film layer during the dyeing process or after contacting water, and further improving the dyeing homochromaticity of the wrapped yarn and blended fabrics. DETAILED DESCRIPTION Example

[0030] Example 1-1, a wrapped yarn, using raw materials as shown in Table 1, including the following preparation process: Preparation of polyester yarn: The polyester fiber (1.5D, 38mm) was treated with alkali solution (alkali solution concentration 8g / L, immersion time 2h, bath ratio 1:10), and then the alkali-treated polyester fiber was dried, and then impregnated with a dyeing modified impregnation solution (using raw materials as shown in Table 2), and the mass ratio of the polyester fiber to the dyeing modified impregnation solution was 1:25; after the polyester fiber was impregnated with the dyeing modified impregnation solution for 20h, it was filtered and pre-dried at 50°C for 15min, and then placed at 120°C for high temperature reaction for 1h, and then washed and dried to prepare modified polyester fiber; the modified polyester fiber was subjected to wool and wool, needle combing into strips, drawing, air spinning, winding, spinning, and spinning to obtain polyester yarn.

[0031] Preparation of mixed yarn: wool fiber (average diameter 35μm, length 70mm) and nylon fiber (1.5D, 55mm) are spun into mixed yarn through wool and needle combing, drawing, air spinning, winding, and mixed spinning.

[0032] Preparation of wrapped yarn: polyester yarn is used as the yarn core, and wool-nylon mixed yarn is spirally wrapped on the surface of the polyester yarn to obtain the wrapped yarn.

[0033] Embodiment 1-2 to embodiment 1-3 are a kind of wrapped yarn, which is different from embodiment 1-1 in that the process parameters of raw material weight, polyester fiber treated with alkali solution and dyeing modified impregnation solution are set differently, as shown in Table 1.

[0034] Table 1: List of process parameters for raw material weight, polyester fiber treated with alkali solution and dyed modified impregnation solution in the preparation of wrapped yarns of Examples 1-1 to 1-3 Table 2: List of raw materials and their weights used in the dyeing and modification impregnation liquid in the preparation of the wrapped yarns of Examples 1-1 to 1-3 Example 1-4 is a wrapped yarn, which is different from Example 1-1 in that the content of sodium alginate is 4wt%, calcium chloride is 8wt%, tannin is 5wt%, water-based blocked isocyanate is 8wt%, and glutaraldehyde is 1wt%.

[0035] Example 1-5 is a wrapped yarn, which differs from Example 1-1 in that the content of sodium alginate is 2wt%, calcium chloride is 6wt%, tannin is 8wt%, water-based blocked isocyanate is 15wt%, and glutaraldehyde is 1wt%.

[0036] Example 1-6 is a wrapped yarn, which differs from Example 1-1 in that the content of sodium alginate is 1wt%, calcium chloride is 3wt%, tannin is 10wt%, water-based blocked isocyanate is 18wt%, and glutaraldehyde is 1.2wt%.

[0037] Example 1-7 is a wrapped yarn, which differs from Example 1-1 in that the content of sodium alginate is 3wt%, calcium chloride is 7wt%, tannin is 0.2wt%, water-based blocked isocyanate is 10wt%, and glutaraldehyde is 0.3wt%.

[0038] Example 1-8 is a wrapped yarn, which is different from Example 1-1 in that 40 kg of wool fiber, 8 kg of nylon fiber and 25 kg of polyester fiber are used.

[0039] Example 1-9 is a wrapped yarn, which is different from Example 1-1 in that 55 kg of wool fiber, 10 kg of nylon fiber and 60 kg of polyester fiber are used.

[0040] Example 1-10 is a wrapped yarn, which is different from Example 1-1 in that 65 kg of wool fiber, 12 kg of nylon fiber and 17 kg of polyester fiber are used.

[0041] Example 1-11 is a wrapped yarn, which is different from Example 1-1 in that 30 kg of wool fiber, 5 kg of nylon fiber, and 45 kg of polyester fiber are used.

[0042] Example 1-12, a wrapped yarn, is different from Example 1-1 in that the dyeing and modification impregnation solution further includes 0.6 wt % hydroxyl-terminated silicone oil.

[0043] Example 1-13, a wrapped yarn, is different from Example 1-2 in that the dyeing modification impregnation solution further includes 1.5 wt % hydroxyl-terminated silicone oil.

[0044] Example 2-1, a blended fabric, the preparation process of which is as follows: The wrapped yarn of Example 1-1 is used as the warp and weft, and the warp and weft are the same; after warping, drawing in, weaving, grey cloth inspection, and raw repair, it is woven into a 2 / 2 herringbone pattern on an air jet loom; then it is inspected, sewn, piece dyed, shrunk, washed, dehydrated, dried, steamed, raised, dried, ironed, cut, inspected, and made into a gram weight of 450g / m 2 Blended fabrics.

[0045] In the piece dyeing process, the dyeing solution used contains reactive blue dye 69 (superior grade) 3% owf, dispersant NNO 2g / L, penetrant JFC 3g / L, didodecyl dimethyl ammonium bromide 2g / L, triethanolamine etc. as pH adjustment to 5; bath ratio 1:25, dyeing at 60°C for 30min, vehicle speed 20m / min, and then treated at 160°C for 2min.

[0046] Embodiment 2-2 to embodiment 2-13 are a blended fabric, which is different from embodiment 2-1 in that the wrapping yarns are the wrapping yarns of embodiment 1-2 to embodiment 1-13 in sequence.

[0047] Comparative Example Comparative Example 1-1 is a wrapped yarn, which is different from Example 1-1 in that 70 kg of wool fiber, 15 kg of nylon fiber, and 15 kg of polyester fiber are used.

[0048] Comparative Example 1-2 is a wrapped yarn, which is different from Example 1-1 in that the polyester fiber is not treated with alkali solution.

[0049] Comparative Example 1-3 is a wrapped yarn, which is different from Example 1-1 in that tannin is used in an equal amount to replace sodium alginate in the dyeing modified impregnation liquid; and aqueous blocked isocyanate is used in an equal amount to replace calcium chloride.

[0050] Comparative Example 1-4 is a wrapped yarn, which is different from Example 1-1 in that tannin is used in an equal amount to replace sodium alginate in the dyeing modified impregnation liquid; and calcium chloride is used in an equal amount to replace aqueous blocked isocyanate.

[0051] Comparative Example 1-5 is a wrapped yarn, which is different from Example 1-1 in that an equal amount of aqueous blocked isocyanate replaces calcium chloride in the dyeing modified impregnation liquid.

[0052] Comparative Examples 2-1 to 2-5 are blended fabrics, which differ from Example 2-1 in that the wrapping yarns are the wrapping yarns of Comparative Examples 1-1 to 1-5, respectively.

[0053] Comparative Example 2-6, a blended fabric, the preparation process of which is as follows: (1) The raw materials used were 70 kg wool fiber (average diameter 35 μm, length 70 mm), 10 kg nylon fiber (1.5D, 55 mm), and 20 kg polyester staple fiber (1.5D, 38 mm).

[0054] (2) The polyester staple fibers were dyed with a disperse dye (Disperse Turquoise Blue S-GL) solution at a temperature of 130°C for 60 min. The bath ratio was 1:25. The composition and weight percentage of the disperse dye solution were as follows: 7% disperse dye, 4% glycosyl quaternary ammonium salt surfactant, and the remainder was deionized water.

[0055] (3) The wool fiber and nylon fiber are then mixed and combed into strips, drawn, air-spun, and wound, and mixed and spun into mixed yarn, with a spinning humidity of 75-85% and a temperature of 25-30 degrees Celsius; the polyester staple fibers are then mixed, combed into strips, drawn, air-spun, and wound, and mixed and spun into polyester yarn, with a spinning humidity of 75-85% and a temperature of 25-30 degrees Celsius.

[0056] (4) using the dyed polyester yarn obtained in step 2 as the yarn core, and wrapping the mixed yarn obtained in step 3 around the surface of the polyester filament in a spiral to obtain a wrapped yarn; (5) Weaving: The wrapped yarn obtained in step 4 is used as the warp and weft, and the warp and weft are the same; after warping, drawing in, weaving, grey fabric inspection, and raw repair, it is woven into a 2 / 2 herringbone pattern on an air jet loom; Finishing: Through the process of grey fabric inspection, sewing, piece dyeing, shrinking, washing, dehydration, drying, steaming, raising, drying, ironing and cutting, and inspection, a blended fabric is made. In the piece dyeing process of the finishing, the amount of acid dye (acid blue 74) added is 3% of the weight of the grey fabric, and the bath ratio is 1:25.

[0057] Performance testing Test 1: Homochromaticity test The color index L of the two fibers after dyeing was measured using a Datacolor SF600 spectrophotometer, and the brightness difference ΔL was used to represent the homochromy. The smaller the ΔL, the better the homochromy. In this application, ΔL = L polyester-L mixed yarn, polyester is the polyester fiber in the test sample; mixed yarn is the mixed yarn in the test sample.

[0058] Test 2: Shrinkage The test sample was washed three times according to the International Wool Bureau TM31 washing standard for wool textile products, and the area shrinkage rate (%) = (area before washing - area after washing) / area before washing * 100%.

[0059] Test 3: Rubbing fastness The rubbing fastness test of the test samples was carried out in accordance with GB / T3920-2008.

[0060] Test samples: The blended fabrics of Examples 2-1 to 2-13 are taken as example samples; the blended fabrics of Comparative Examples 2-1 to 2-6 are taken as comparative example samples.

[0061] Test results: The test results of the same color test, shrinkage rate and friction fastness of the blended fabrics of Examples 2-1 to 2-13 and Comparative Examples 2-1 to 2-6 are shown in Table 3: Table 3: Test results of homochromy test, shrinkage rate and friction fastness of blended fabrics of Examples 2-1 to 2-13 and Comparative Examples 2-1 to 2-6 Combining Examples 2-1 to 2-13 and Comparative Examples 2-1 to 2-6 and Table 3, it can be seen that: Compared with the test results of Comparative Examples 2-1 to 2-6, the blended fabric of Example 2-1 has both good homochromicity and low shrinkage, indicating that the film layer formed by reaction on the polyester fiber after being treated with alkali solution and then treated with the dyeing modified impregnation liquid improves the dyeing performance of the polyester fiber; the amount of wool fiber, nylon fiber and polyester fiber is optimized, so that the blended fabric using the prepared wrapped yarn has both good homochromicity and low shrinkage; it may be because the modified impregnation liquid treatment contains more hydroxyl groups in the film layer formed on the polyester fiber, thereby improving the dyeing performance of the polyester fiber; the amount of wool fiber, nylon fiber and polyester fiber is optimized, and the polyester fiber with a higher content makes the blended fabric have better anti-shrinkage performance; in the wrapped yarn, a certain amount of wool fiber and nylon fiber are wrapped on the surface of the polyester fiber, which reduces the damage of the film layer of the polyester fiber during the dyeing process, and further improves the homochromicity of the wool fiber, nylon fiber and polyester fiber in the wrapped yarn.

[0062] Compared with Example 2-1, the colorimetric properties and rubbing fastness of the blended fabric of Comparative Example 2-2 are poor. This may be because the polyester fiber is not treated with alkali solution, the polyester fiber has fewer active groups on the surface, and the bonding performance between the film layer formed on the polyester fiber by the modified impregnation liquid treatment and the polyester fiber is poor. The film layer is easily damaged during dyeing or after contacting water, resulting in a decrease in the colorimetric properties and rubbing fastness of the blended fabric.

[0063] Compared with Comparative Examples 2-3 to 2-5, Example 2-4, Example 2-6 to Example 2-7, the blended fabrics of Example 2-1 and Example 2-5 have better homochromicity, indicating that sodium alginate, calcium chloride, tannin, dialdehyde and aqueous blocked isocyanate are used in combination in the dyeing modified impregnation solution, and the dosage is optimized to further improve the homochromicity of the prepared wrapped yarn and blended fabrics; it may be because the combination of sodium alginate and tannin can better improve the dyeing performance of polyester fiber, calcium chloride can improve the strength of the film formed by sodium alginate, and the aqueous blocked isocyanate and dialdehyde can improve the dyeing performance. The strength of the film formed by tannin and sodium alginate is improved; when the content of calcium chloride, water-based blocked isocyanate and glutaraldehyde is too low, the strength of the film is low, and the film is easily damaged during dyeing or when it comes into contact with water, thereby reducing the color uniformity; when the content of calcium chloride is too high, the water resistance of the film is reduced; when the content of water-based blocked isocyanate and glutaraldehyde is too high, the toughness of the film is reduced, the strength of the film is reduced, and the film is also easily damaged during dyeing or after coming into contact with water, resulting in reduced color uniformity of the prepared wrapped yarn and blended fabric; in addition, the water resistance or strength of the film is reduced, resulting in reduced friction fastness of the wrapped yarn and blended fabric.

[0064] Compared with Example 2-1 and Example 2-2, the blended fabrics of Example 2-12 and Example 2-13 have better colorimetric properties and rubbing fastness, indicating that the use of hydroxyl-terminated silicone oil in the dyeing modified impregnation solution improves the colorimetric properties and rubbing fastness of the wrapped yarn and the blended fabric.

[0065] This may be because hydroxyl-terminated silicone oil is used in the dyeing modified impregnation liquid. The hydroxyl-terminated silicone oil can reduce the surface energy of the film layer formed by the reaction of the dyeing modified impregnation liquid and improve the softness of the film layer, thereby reducing the damage of the film layer during the dyeing process and after contact with water, and further improving the dyeing homogeneity and friction fastness of the wool fiber, nylon fiber and polyester fiber in the wrapped yarn after dyeing.

[0066] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A wrapped yarn, characterized in that: The invention comprises 30-65 parts of wool fiber, 5-12 parts of nylon fiber and 17-45 parts of polyester fiber in parts by weight; the nylon fiber and polyester fiber are blended into mixed yarn and then coated on polyester yarn spun from polyester fiber to prepare wrapped yarn; the polyester fiber comprises a film layer formed by reaction on the polyester fiber after being treated with alkali solution and then with dyeing modified impregnation liquid; the dyeing modified impregnation liquid comprises sodium alginate, tannin, calcium chloride, dialdehyde and water-based blocked isocyanate.

2. The wrapping yarn according to claim 1, characterized in that The dyeing modified impregnation liquid comprises, based on the weight of the dyeing modified impregnation liquid, 1-3wt% sodium alginate, 3-7wt% calcium chloride, 0.2-10wt% tannin, 10-18wt% water-based blocked isocyanate and 0.3-1.2wt% dialdehyde; the NCO content of the water-based blocked isocyanate is 5-6wt%.

3. The wrapping yarn according to claim 2, characterized in that The content of the sodium alginate is 2wt%, the calcium chloride is 5-6wt%, the tannin is 5-8wt%, the water-based blocked isocyanate is 12-15wt%, and the dialdehyde is 1wt%.

4. The wrapping yarn according to claim 2, characterized in that The average number average molecular weight of the sodium alginate is 8000-20000; the average number average molecular weight of the water-based blocked isocyanate is 2000-10000; and the average number average molecular weight of the tannin is 500-3000.

5. The wrapping yarn according to claim 2, characterized in that The wool fiber accounts for 40-55 parts, the nylon fiber accounts for 8-10 parts, and the polyester fiber accounts for 25-60 parts.

6. The wrapping yarn according to claim 2, characterized in that The dyeing modified impregnation solution also includes 0.6-1.5wt% hydroxyl-terminated silicone oil.

7. A method for preparing a wrapped yarn according to any one of claims 1 to 6, characterized in that: The mass ratio of the polyester fiber to the dyeing modified impregnation liquid is 1: (20-30); after the polyester fiber is impregnated with the dyeing modified impregnation liquid for 10-24 hours, it is first pre-dried at 25-60°C, and then dried at 100-150°C for 0.5-2 hours.

8. The method for preparing a wrapped yarn according to claim 7, characterized in that: The concentration of the alkali solution is 6-10 g / L, and the treatment time is 1-3 h.

9. A blended fabric prepared by using the wrapped yarn according to any one of claims 1 to 6, characterized in that: The blended fabric can be a twill fabric, a satin fabric or a plain weave fabric.

10. The blended fabric according to claim 9, characterized in that: The blended fabric is dyed with reactive dyes.

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