Production process of cotton fiber blended yarn

Abstract

The invention relates to a production process of cotton fiber blended yarn, and belongs to the technical field of blended yarn production processes. The production process of the cotton fiber blended yarn comprises the following steps: preparing the spandex fiber through a modified spinning solution by adopting dry spinning, and then interweaving and blending the polyamide fiber and the spandex fiber to obtain the cotton fiber blended yarn, the modified spinning solution is prepared from the following components: isocyanate, dihydric alcohol, modified titanium dioxide, hexamethylenediamine, other auxiliaries and a solvent. The cotton fiber blended yarn prepared by the preparation method disclosed by the invention has excellent antibacterial performance while having good flexibility.

Description

Technical Field

[0001] The invention belongs to the technical field of blended yarn production technology and relates to a production technology of cotton fiber blended yarn. Background Art

[0002] In the process of preparing antibacterial fabrics, a variety of methods are usually used to achieve their antibacterial function. One common method is to directly add antibacterial agents to the fibers of the fabric. For example, fiber materials such as bamboo fibers can be used, which have antibacterial properties. These fiber materials naturally have the ability to resist bacterial growth, thus giving the fabric antibacterial properties.

[0003] Titanium dioxide, as a material with excellent photocatalytic properties, is increasingly used in antibacterial fabrics. Titanium dioxide can produce highly oxidizing active oxygen species under light conditions, which can effectively decompose bacterial cell walls and cell membranes, thereby achieving an antibacterial effect. Therefore, the application of titanium dioxide in antibacterial fabrics can significantly improve the antibacterial properties of fabrics, making them have broad application prospects in the fields of medical care, hygiene, and daily life.

[0004] Specifically, titanium dioxide nanoparticles can be evenly dispersed in textile fibers, or titanium dioxide can be coated on the surface of fabrics through coating technology to give textiles excellent antibacterial properties. This antibacterial fabric can effectively inhibit the growth and reproduction of bacteria and reduce odor and infection caused by bacteria. However, in the process of preparing textile fibers, the compatibility between titanium dioxide and spandex textile fibers is poor. The compatibility and dispersibility of titanium dioxide directly affect its antibacterial properties, which limits its application in blended yarns. Summary of the invention

[0005] The purpose of the present invention is to provide a production process of cotton fiber blended yarn. The cotton fiber blended yarn of the present invention is made by interweaving and blending nylon fiber and spandex fiber, and has good flexibility and excellent antibacterial property.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A production process of cotton fiber blended yarn comprises the following steps: preparing spandex fiber by modifying spinning solution through dry spinning, and then preparing the blended yarn by interweaving nylon fiber and spandex fiber;

[0008] The mass ratio of the nylon fiber to the spandex fiber is 1:0.9-1.1; the parameters of the dry spinning are a spinning temperature of 245-252° C. and a spinning speed of 800-1000 m / min.

[0009] The modified spinning solution comprises the following components in parts by weight:

[0010]

[0011] As a preferred technical solution of the present invention, the diol is polytetramethylene ether diol with a molecular weight of 1500-3000Da; more preferably, the molecular weight is 2000Da.

[0012] As a preferred technical solution of the present invention, the isocyanate is prepared by mixing lysine diisocyanate and diphenylmethane diisocyanate in a mass ratio of 2:1.0-1.2.

[0013] As a preferred technical solution of the present invention, the solvent is one or two of N,N-dimethylacetamide and N,N-dimethylformamide.

[0014] As a preferred technical solution of the present invention, the other auxiliary agent is a mixture of ultraviolet absorber UV-9 and antioxidant 1010 in a mass ratio of (3-5): (4-6), and a more preferred mass ratio is 4:5.

[0015] The invention discloses a method for preparing the modified spinning solution, which comprises the following steps:

[0016] After mixing the isocyanate and the diol, heat to 80-85° C. and stir for 3-4 hours, add the modified titanium dioxide, hexamethylenediamine, other additives and solvents and stir and mix, and heat at 40-50° C. for 28-30 hours to obtain a modified spinning solution.

[0017] The invention discloses a method for preparing modified titanium dioxide, comprising the following steps:

[0018] 1) titanium dioxide and anhydrous ethanol are stirred and mixed, vinyl catechol is added for grinding, aminobenzenethiol and a photosensitizer are added for ultraviolet irradiation treatment, the supernatant is removed by centrifugation, a solid is taken for washing, and vacuum drying is performed to a constant weight to obtain an intermediate synthetic body;

[0019] 2) The intermediate synthetic product, anhydrous ethanol and natural phenol derivatives are heated and stirred, then cooled to room temperature, filtered, and the solid matter is washed and vacuum dried to constant weight to obtain modified titanium dioxide.

[0020] As a preferred technical solution of the present invention, in step 1), the stirring and mixing is stirring at a speed of 400-500 r / min for 20-30 min; the grinding time is 40-50 min; the photosensitizer is photosensitizer 1173; the ultraviolet irradiation treatment is UV irradiation at a wavelength of 365 nm for 6-8 h; the washing is washing four times with anhydrous ethanol; the vacuum drying temperature is 80°C; the mass ratio of titanium dioxide, vinyl catechol, aminobenzenethiol, anhydrous ethanol and photosensitizer is 16-18:3.8-4.2:2.2-2.6:60-70:0.13-0.15; the vinyl catechol is 4-vinyl catechol; and the aminobenzenethiol is m-aminobenzenethiol.

[0021] As a preferred technical solution of the present invention, in step 2), the heating and stirring is stirring at a temperature of 52-65°C for 6-7h; the temperature of the vacuum drying is 70-90°C (more preferably 80°C); the washing is washing four times with anhydrous ethanol; the mass ratio of the intermediate synthetic product, anhydrous ethanol and natural phenol derivative is 20:60-70:3.4-3.8; and the natural phenol derivative is 2-hydroxy-4-pentadecanylbenzaldehyde.

[0022] As a preferred technical solution of the present invention, the 2-hydroxy-4-pentadecylbenzaldehyde is prepared using cardanol as a raw material.

[0023] Beneficial effects of the present invention:

[0024] The cotton fiber blended yarn of the present invention is prepared by interweaving and blending nylon fiber and spandex fiber, and has good flexibility and excellent antibacterial property. Specifically, the present invention compounded lysine diisocyanate and diphenylmethane diisocyanate to ensure that the spandex fiber has a dense structure, and combined with modified titanium dioxide, significantly promoted its dispersibility and compatibility in the polyurethane system, while improving the antibacterial property of the spandex fiber. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0026] A production process of cotton fiber blended yarn comprises the following steps: preparing spandex fiber by modifying spinning solution through dry spinning, and then preparing spandex fiber by interweaving and blending nylon fiber and spandex fiber; wherein the mass ratio of nylon fiber to spandex fiber is 1:0.9-1.1; the parameters of dry spinning are spinning temperature of 245-252°C and spinning speed of 800-1000m / min;

[0027] The modified spinning solution comprises the following components in parts by weight:

[0028]

[0029] The diol is polytetramethylene glycol with a molecular weight of 2000Da;

[0030] The isocyanate is prepared by mixing lysine diisocyanate and diphenylmethane diisocyanate in a mass ratio of 2:1.0-1.2;

[0031] The solvent is one or two of N,N-dimethylacetamide and N,N-dimethylformamide;

[0032] The other auxiliary agents are prepared by mixing ultraviolet absorber UV-9 and antioxidant 1010 in a mass ratio of 4:5.

[0033] The preparation method of the modified spinning solution comprises the following steps:

[0034] After mixing the isocyanate and the diol, heat to 80-85° C. and stir for 3-4 hours, add the modified titanium dioxide, hexamethylenediamine, other additives and solvents and stir and mix, and heat at 40-50° C. for 28-30 hours to obtain a modified spinning solution.

[0035] The preparation of the spandex fiber comprises: dry spinning the modified spinning solution at a spinning temperature of 245-252° C. and a spinning speed of 800-1000 m / min to obtain the spandex fiber.

[0036] The preparation method of the modified titanium dioxide comprises the following steps:

[0037] 1) After titanium dioxide and anhydrous ethanol are stirred at a speed of 400-500 r / min for 20-30 min, vinyl catechol is added and ground for 40-50 min, aminobenzenethiol and a photosensitizer are added and UV irradiated at a wavelength of 365 nm for 6-8 h, the supernatant is removed by centrifugation, the solid is washed four times with anhydrous ethanol, and vacuum dried at a temperature of 80° C. to constant weight to obtain an intermediate synthetic body; the mass ratio of titanium dioxide, vinyl catechol, aminobenzenethiol, anhydrous ethanol and photosensitizer is 16-18:3.8-4.2:2.2-2.6:60-70:0.13-0.15; the vinyl catechol is 4-vinyl catechol; the aminobenzenethiol is m-aminobenzenethiol; the photosensitizer is photosensitizer 1173;

[0038] 2) Stirring the intermediate synthetic body, anhydrous ethanol and natural phenol derivatives at 52-65°C for 6-7h, cooling to room temperature, filtering, washing the solid with anhydrous ethanol four times, and vacuum drying at 80°C to constant weight to obtain modified titanium dioxide; the mass ratio of the intermediate synthetic body, anhydrous ethanol and natural phenol derivatives is 20:60-70:3.4-3.8; the natural phenol derivative is 2-hydroxy-4-pentadecanylbenzaldehyde.

[0039] Example 1

[0040] The modified spinning solution comprises the following components in parts by weight:

[0041]

[0042] The diol is polytetramethylene glycol with a molecular weight of 2000Da;

[0043] The isocyanate is prepared by mixing lysine diisocyanate and diphenylmethane diisocyanate in a mass ratio of 2:1.0;

[0044] The solvent is N,N-dimethylacetamide;

[0045] The other auxiliary agents are prepared by mixing ultraviolet absorber UV-9 and antioxidant 1010 in a mass ratio of 4:5.

[0046] The preparation method of the modified spinning solution comprises the following steps:

[0047] After mixing the isocyanate and the diol, the mixture is heated to 80° C. and stirred for 3 hours. Modified titanium dioxide, hexamethylenediamine, other additives and solvents are added and stirred and mixed. After heating at 40° C. for 28 hours, a modified spinning solution is obtained.

[0048] The preparation of the spandex fiber comprises: obtaining the spandex fiber by dry spinning the modified spinning solution at a spinning temperature of 245° C. and a spinning speed of 800 m / min.

[0049] The preparation method of the modified titanium dioxide comprises the following steps:

[0050] 1) After titanium dioxide and anhydrous ethanol are stirred at a speed of 400 r / min for 20 minutes, vinyl catechol is added and ground for 40 minutes, aminobenzenethiol and a photosensitizer are added and UV irradiated at a wavelength of 365 nm for 6 hours, the supernatant is removed by centrifugation, the solid is washed four times with anhydrous ethanol, and vacuum dried at 80° C. to constant weight to obtain an intermediate synthetic body;

[0051] The mass ratio of titanium dioxide, vinyl catechol, aminobenzenethiol, anhydrous ethanol and photosensitizer is 16:3.8:2.2:60:0.13; the vinyl catechol is 4-vinyl catechol; the aminobenzenethiol is m-aminobenzenethiol; the photosensitizer is photosensitizer 1173;

[0052] 2) Stirring the intermediate synthetic product, anhydrous ethanol and natural phenol derivatives at 52° C. for 6 hours, cooling to room temperature, filtering, washing the solid with anhydrous ethanol four times, and vacuum drying at 80° C. to constant weight to obtain modified titanium dioxide; the mass ratio of the intermediate synthetic product, anhydrous ethanol and natural phenol derivatives is 20:60:3.4; the natural phenol derivative is 2-hydroxy-4-pentadecanylbenzaldehyde.

[0053] Example 2

[0054] The modified spinning solution comprises the following components in parts by weight:

[0055]

[0056] The diol is polytetramethylene glycol with a molecular weight of 2000Da;

[0057] The isocyanate is prepared by mixing lysine diisocyanate and diphenylmethane diisocyanate in a mass ratio of 2:1.1;

[0058] The solvent is N,N-dimethylacetamide;

[0059] The other auxiliary agents are prepared by mixing ultraviolet absorber UV-9 and antioxidant 1010 in a mass ratio of 4:5.

[0060] The preparation method of the modified spinning solution comprises the following steps:

[0061] After mixing the isocyanate and the diol, the mixture is heated to 82° C. and stirred for 3.5 hours. Modified titanium dioxide, hexamethylenediamine, other additives and solvents are added and stirred and mixed. After heating at 45° C. for 29 hours, a modified spinning solution is obtained.

[0062] The preparation of the spandex fiber comprises: obtaining the spandex fiber by dry spinning the modified spinning solution at a spinning temperature of 248° C. and a spinning speed of 900 m / min.

[0063] The preparation method of the modified titanium dioxide comprises the following steps:

[0064] 1) After titanium dioxide and anhydrous ethanol are stirred at a speed of 450 r / min for 25 minutes, vinyl catechol is added and ground for 45 minutes, aminobenzenethiol and a photosensitizer are added and UV irradiated at a wavelength of 365 nm for 7 hours, the supernatant is removed by centrifugation, the solid is washed four times with anhydrous ethanol, and vacuum dried at a temperature of 80°C to constant weight to obtain an intermediate synthetic body; the mass ratio of titanium dioxide, vinyl catechol, aminobenzenethiol, anhydrous ethanol and photosensitizer is 17:4:2.4:65:0.14; the vinyl catechol is 4-vinyl catechol; the aminobenzenethiol is m-aminobenzenethiol; the photosensitizer is photosensitizer 1173;

[0065] 2) Stirring the intermediate synthetic product, anhydrous ethanol and natural phenol derivatives at 58°C for 6.5 hours, cooling to room temperature, filtering, washing the solid with anhydrous ethanol four times, and vacuum drying at 80°C to constant weight to obtain modified titanium dioxide; the mass ratio of the intermediate synthetic product, anhydrous ethanol and natural phenol derivative is 20:65:3.6; the natural phenol derivative is 2-hydroxy-4-pentadecanylbenzaldehyde.

[0066] Example 3

[0067] The modified spinning solution comprises the following components in parts by weight:

[0068]

[0069] The diol is polytetramethylene ether diol with a molecular weight of 2000Da;

[0070] The isocyanate is prepared by mixing lysine diisocyanate and diphenylmethane diisocyanate in a mass ratio of 2:1.2;

[0071] The solvent is N,N-dimethylacetamide;

[0072] The other auxiliary agents are prepared by mixing ultraviolet absorber UV-9 and antioxidant 1010 in a mass ratio of 4:5.

[0073] The preparation method of the modified spinning solution comprises the following steps:

[0074] After mixing the isocyanate and the diol, the mixture is heated to 85° C. and stirred for 4 hours. Modified titanium dioxide, hexamethylenediamine, other additives and solvents are added and stirred and mixed. After heating at 50° C. for 30 hours, a modified spinning solution is obtained.

[0075] The preparation of the spandex fiber comprises: obtaining the spandex fiber by dry spinning the modified spinning solution at a spinning temperature of 252° C. and a spinning speed of 1000 m / min.

[0076] The preparation method of the modified titanium dioxide comprises the following steps:

[0077] 1) After titanium dioxide and anhydrous ethanol are stirred at a speed of 500 r / min for 30 minutes, vinyl catechol is added and ground for 50 minutes, aminobenzenethiol and a photosensitizer are added and UV irradiated at a wavelength of 365 nm for 8 hours, the supernatant is removed by centrifugation, the solid is washed four times with anhydrous ethanol, and vacuum dried at a temperature of 80°C to constant weight to obtain an intermediate synthetic body; the mass ratio of titanium dioxide, vinyl catechol, aminobenzenethiol, anhydrous ethanol and photosensitizer is 18:4.2:2.6:70:0.15; the vinyl catechol is 4-vinyl catechol; the aminobenzenethiol is m-aminobenzenethiol; the photosensitizer is photosensitizer 1173;

[0078] 2) Stir the intermediate synthetic product, anhydrous ethanol and natural phenol derivatives at 65°C for 7 hours, cool to room temperature, filter, wash the solid four times with anhydrous ethanol, and vacuum dry at 80°C to constant weight to obtain modified titanium dioxide; the mass ratio of the intermediate synthetic product, anhydrous ethanol and natural phenol derivative is 20:70:3.8; the natural phenol derivative is 2-hydroxy-4-pentadecanylbenzaldehyde.

[0079] Comparative Example 1

[0080] Compared with Example 3, the difference in Comparative Example 1 is that the isocyanate is lysine diisocyanate, and the other components, preparation steps and parameters are the same.

[0081] Comparative Example 2

[0082] Compared with Example 3, the difference in Comparative Example 2 is that the isocyanate is diphenylmethane diisocyanate, and the other components, preparation steps and parameters are the same.

[0083] Comparative Example 3

[0084] Compared with Example 3, Comparative Example 3 is different in that vinyl catechol is not used, and the other components, preparation steps and parameters are the same.

[0085] Comparative Example 4

[0086] Compared with Example 3, Comparative Example 4 is different in that aminobenzenethiol is not used, and the remaining components, preparation steps and parameters are the same.

[0087] Comparative Example 5

[0088] Compared with Example 3, the difference in Comparative Example 5 is that 2-hydroxybenzaldehyde replaces the natural phenol derivative, and the other components, preparation steps and parameters are the same.

[0089] The spandex fibers prepared in Examples 1-3 and Comparative Examples 1-5 were tested for the following properties, and the test results are shown in Table 1.

[0090] Antibacterial test: The antibacterial rate was tested using the GB / T20944.3-2008 oscillation method.

[0091] Table 1: Effect test

[0092] Escherichia coli inhibition rate (%) Candida albicans inhibition rate (%) Example 1 95.4 92.2 Example 2 94.8 91.4 Example 3 96.1 92.8 Comparative Example 1 81.6 75.7 Comparative Example 2 75.4 71.3 Comparative Example 3 76.2 71.6 Comparative Example 4 72.7 68.6 Comparative Example 5 73.3 70.2

[0093] From the test results in Table 1, it can be seen that compared with Comparative Examples 1-5, the spandex fibers prepared in Examples 1-3 have excellent antibacterial effects.

[0094] Through comparative analysis, it can be known that this is because the present invention is compounded by lysine diisocyanate and diphenylmethane diisocyanate, the benzene ring structure of diphenylmethane diisocyanate has steric hindrance, and too much content is not conducive to the dispersion of modified titanium dioxide in the polyurethane system, and too much lysine diisocyanate is not conducive to the formation of a dense structure, and its antibacterial performance is reduced; in addition, the present invention introduces a catechol group by compounding a coordination bond between vinyl catechol and titanium dioxide, increases active sites, and utilizes the interaction between amino and phenolic hydroxyl groups to facilitate the grafting between the dethiol group and the vinyl group, and then utilizes the amino and aldehyde groups to form a Schiff base bond connection. The Schiff base bond has good compatibility with lysine diisocyanate, which further promotes the interfacial bonding force of titanium dioxide in the polyurethane system. In addition, catechol has a higher reactivity than alcohol hydroxyl groups, and can react with isocyanate to form a Schiff base bond. The modified titanium dioxide contains catechol structure, Schiff base structure and benzene ring structure at the same time, forming a dense structure, which improves the antibacterial properties of spandex fiber. The introduction of catechol structure and Schiff base structure, natural phenol derivatives are prepared through cardanol, and the hydrophobic carbon long chain improves the fluidity of the modified titanium dioxide in the polyurethane system, while improving the hydrophobic property and promoting its contact with bacteria, and plays an antibacterial role through mechanisms such as destroying the bacterial cell membrane, inhibiting enzyme activity, and interfering with the bacterial metabolic pathway. Catechol can destroy the bacterial cell wall through phenolic hydroxyl group, leading to bacterial death; and the unique molecular structure of Schiff base structure and titanium metal complex provide different antibacterial mechanisms, interfering with the bacterial metabolic pathway and destroying the bacterial cell structure.

[0095] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any indirect modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A production process for cotton fiber blended yarn, characterized in that: The following steps are involved: The spandex fiber is prepared by dry spinning through modified spinning solution, and then prepared by interweaving and blending nylon fiber and spandex fiber; The modified spinning solution comprises the following components in parts by weight: Wherein, the preparation method of the modified titanium dioxide comprises the following steps: 1) titanium dioxide and anhydrous ethanol are stirred and mixed, vinyl catechol is added for grinding, aminobenzenethiol and a photosensitizer are added for ultraviolet irradiation treatment, the supernatant is removed by centrifugation, a solid is taken for washing, and vacuum drying is performed to a constant weight to obtain an intermediate synthetic body; 2) The intermediate synthetic product, anhydrous ethanol and natural phenol derivatives are heated and stirred, then cooled to room temperature, filtered, and the solid matter is washed and vacuum dried to constant weight to obtain modified titanium dioxide.

2. The production process of a cotton fiber blended yarn according to claim 1, characterized in that: The mass ratio of the nylon fiber to the spandex fiber is 1:0.9-1.1; the parameters of the dry spinning are a spinning temperature of 245-252° C. and a spinning speed of 800-1000 m / min.

3. The production process of a cotton fiber blended yarn according to claim 1, characterized in that: The diol is polytetramethylene ether diol with a molecular weight of 1500-3000Da; the isocyanate is prepared by mixing lysine diisocyanate and diphenylmethane diisocyanate in a mass ratio of 2:1.0-1.

2.

4. The production process of a cotton fiber blended yarn according to claim 1, characterized in that: The solvent is one or two of N,N-dimethylacetamide and N,N-dimethylformamide; the other auxiliary agent is a mixture of ultraviolet absorber UV-9 and antioxidant 1010 in a mass ratio of (3-5): (4-6).

5. The production process of a cotton fiber blended yarn according to claim 1, characterized in that: The preparation method of the modified spinning solution comprises the following steps: After mixing the isocyanate and the diol, heat to 80-85° C. and stir for 3-4 hours, add the modified titanium dioxide, hexamethylenediamine, other additives and solvents and stir and mix, and heat at 40-50° C. for 28-30 hours to obtain a modified spinning solution.

6. The production process of a cotton fiber blended yarn according to claim 1, characterized in that: In step 1), the stirring and mixing is stirring at a speed of 400-500 r / min for 20-30 min; the grinding time is 40-50 min; the washing is washing four times with anhydrous ethanol; and the vacuum drying temperature is 70-90°C.

7. The production process of a cotton fiber blended yarn according to claim 1, characterized in that: In step 1), the photosensitizer is photosensitizer 1173; the ultraviolet irradiation treatment is UV irradiation at a wavelength of 365nm for 6-8h; the mass ratio of titanium dioxide, vinyl catechol, aminobenzenethiol, anhydrous ethanol and photosensitizer is 16-18:3.8-4.2:2.2-2.6:60-70:0.13-0.15; the vinyl catechol is 4-vinyl catechol; and the aminobenzenethiol is m-aminobenzenethiol.

8. The production process of a cotton fiber blended yarn according to claim 1, characterized in that: In step 2), the heating and stirring is stirring at a temperature of 52-65° C. for 6-7 hours; the vacuum drying temperature is 80° C.; and the washing is washing four times with anhydrous ethanol.

9. The production process of a cotton fiber blended yarn according to claim 1, characterized in that: In step 2), the mass ratio of the intermediate synthetic product, anhydrous ethanol and natural phenol derivative is 20:60-70:3.4-3.8; the natural phenol derivative is 2-hydroxy-4-pentadecanylbenzaldehyde.

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