Ultrafine denier antibacterial composite fiber and its preparation process

Abstract

An ultra-fine denier antibacterial composite fiber and a preparation process thereof, wherein the ultra-fine denier antibacterial composite fiber is blended with ultra-fine denier polyester fiber and other fibers, wherein the other fibers are a mixture of one or more of wool fiber, flax fiber, lyocell fiber, and nylon fiber; the ultra-fine denier polyester fiber is prepared by melt spinning of antibacterial polyester pellets, and the linear density of the ultra-fine denier polyester fiber is less than 0.4 dtex. The ultra-fine denier antibacterial composite fiber and a preparation process thereof of the present invention are prepared by an in-situ polymerization modification method to obtain an ultra-fine denier polyester fiber with antibacterial and ultraviolet prevention functions, and the ultra-fine denier polyester fiber is blended with other fibers to combine the different advantages of each fiber, achieve complementary performance, reduce costs, and have broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of composite fibers, and in particular relates to an ultra-fine denier antibacterial composite fiber and a preparation process thereof. Background Art

[0002] With the development of society, people's quality of life is constantly improving, and their requirements for the clothes they wear are also constantly increasing, and they pay more and more attention to the versatility of textiles. However, for a single fiber, it is not perfect, and it has its advantages and disadvantages. Therefore, in the development of fabrics, the selection of multi-component composite fibers (yarns) has become an inevitable trend.

[0003] Ultrafine denier is a trend in the development of polyester filaments. Polyester ultrafine denier fibers usually refer to polyester filaments with a single yarn density of less than 0.55dtex. Due to the extremely fine linear density of polyester ultrafine denier fibers, the stiffness of the yarn is greatly reduced, and the specific surface area and capillary effect of the yarn are increased. Therefore, the fluffiness and coverage of the fabric are improved, the moisture permeability of the fabric is improved, and its moisture absorption and perspiration function is excellent; the fabric has a high filling density and good warmth retention; at the same time, the low strength of the single yarn is conducive to post-processing such as sanding. Polyester ultrafine denier fibers are compositely spun with different fibers such as wool and nylon, so that the different advantages of each fiber can be fully released, and the performance can be complemented, so that the intrinsic quality of the product is greatly improved. At the same time, it can also reduce the cost used and make the fabric have more functions.

[0004] For example, Chinese patent application No. 201611225491.5 discloses an antibacterial ultrafine denier nylon water-soluble polyester composite fiber and a preparation method, which includes the following components by weight: 50-60 parts of ultrafine denier nylon and 40-50 parts of water-soluble polyester; the composition of the ultrafine denier nylon includes by weight: 85-95 parts of nylon 6 slices, 5-7 parts of activated carbon, 6-10 parts of nano-silicon dioxide and 3-5 parts of modifier; the composition of the water-soluble polyester includes by weight: 40-50 parts of polyethylene terephthalate, 26-34 parts of ethylene glycol, 3-7 parts of catalyst, 2-6 parts of adipic acid, 2-6 parts of zirconium nitrate, 3-5 parts of polyethylene glycol, 4-6 parts of diethylene glycol-5-sulfonate sodium isophthalate, and 5-8 parts of water-soluble adhesive.

[0005] The above patent releases the water-soluble adhesive after hydrolysis, and bonds the ultrafine denier nylon and the water-soluble polyester more tightly together. The resulting composite fiber has the advantages of ultrafine denier nylon and polyester, and the resulting composite fiber is not easy to break. The antibacterial effect is improved by adding an antibacterial modifier to the ultrafine denier nylon.

[0006] The purpose of the present invention is to develop another ultra-fine denier antibacterial composite fiber and its preparation process, which is made by blending ultra-fine denier polyester fiber with other fibers. The ultra-fine denier polyester fiber can be combined with the different advantages of wool fiber, flax fiber, lyocell fiber and nylon fiber. The antibacterial effect is improved by adding nano ZnO dispersed slurry to the ultra-fine denier polyester fiber. Summary of the invention

[0007] Purpose of the invention: In order to overcome the above shortcomings, the purpose of the present invention is to provide an ultra-fine denier antibacterial composite fiber and its preparation process, which can combine the different advantages of ultra-fine denier polyester fiber with wool fiber, flax fiber, lyocell fiber and nylon fiber to achieve complementary performance, reduce the cost and make the fabric have more functions. Through the in-situ polymerization modification method, nano-ZnO dispersed slurry is added as an antibacterial agent to obtain ultra-fine denier polyester fiber with antibacterial and UV protection functions. The preparation process is simple and the application prospect is broad.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] Disclosed is an ultra-fine denier antibacterial composite fiber, which is blended from ultra-fine denier polyester fiber and other fibers, wherein the other fibers are a mixture of one or more of wool fiber, flax fiber, lyocell fiber and nylon fiber; the ultra-fine denier polyester fiber is prepared by melt spinning of antibacterial polyester pellets, and the linear density of the ultra-fine denier polyester fiber is less than 0.4 dtex; the antibacterial polyester pellets comprise the following raw materials in parts by weight: 80-85 parts of terephthalic acid, 36-38 parts of ethylene glycol, 10-15 parts of nano ZnO dispersion slurry, 0.01-0.05 parts of catalyst and 0.01-0.05 parts of stabilizer.

[0010] The ultrafine denier antibacterial composite fiber of the present invention is made by blending ultrafine denier polyester fiber with other fibers. The ultrafine denier polyester fiber can be combined with the different advantages of wool fiber, flax fiber, lyocell fiber and nylon fiber to achieve complementary performance. It can also reduce the cost and make the fabric have more functions.

[0011] Among them, the ultrafine denier polyester fiber is made by melt spinning of antibacterial polyester pellets, and its linear density is less than 0.4dtex. Compared with conventional polyester fibers, ultrafine denier polyester fibers have extremely fine linear density, greatly reduced stiffness, increased specific surface area and capillary effect. After being subsequently made into fabrics, the fluffiness and covering power of the fabrics are improved, the moisture permeability is improved, and it is also beneficial to the filling density, which can improve the warmth retention, and is conducive to post-processing such as sanding.

[0012] The antibacterial polyester pellets are prepared by an in-situ polymerization modification method using terephthalic acid and ethylene glycol as raw materials, nano ZnO dispersion slurry as an antibacterial agent, a catalyst and a stabilizer as auxiliary agents. The nano ZnO dispersion slurry includes nano ZnO, and the nano ZnO inorganic nano material has good effects in antibacterial and ultraviolet prevention. The nano ZnO is dispersed into a nano ZnO dispersion slurry with a stable uniform size. Through the in-situ polymerization modification method, the disadvantages of poor washability and instability can be avoided, and the antibacterial polyester pellets with good spinnability, antibacterial and ultraviolet prevention functions can be prepared.

[0013] Furthermore, the above-mentioned ultrafine denier antibacterial composite fiber is blended by ultrafine denier polyester fiber, wool fiber and lyocell fiber, and the mass ratio of the ultrafine denier polyester fiber, wool fiber and lyocell fiber is 3-5:3-5:1-3.

[0014] Wool fiber, lyocell fiber, and superfine denier polyester fiber all have good feel and gloss, and Lyocell fiber has good moisture absorption and air permeability, comparable to pure cotton. Superfine denier polyester fiber has high strength and wear resistance. The superfine denier antibacterial composite fiber blended with superfine denier polyester fiber, wool fiber, and Lyocell fiber has excellent feel and gloss, and can optimize moisture absorption, air permeability, strength, and wear resistance. In terms of matching, combining chemical fibers with natural fibers can reduce costs.

[0015] Furthermore, the above-mentioned ultrafine denier antibacterial composite fiber is blended by ultrafine denier polyester fiber, wool fiber and nylon fiber, and the mass ratio of the ultrafine denier polyester fiber, wool fiber and nylon fiber is 3-5:2-4:2-4.

[0016] Nylon fiber has excellent moisture absorption, wear resistance and resilience. The ultra-fine denier antibacterial composite fiber made of ultra-fine denier polyester fiber, wool fiber and nylon fiber can optimize the anti-pilling properties, moisture absorption and breathability, drape and wear resistance. In terms of matching, combining chemical fibers with natural fibers can reduce costs.

[0017] Furthermore, the above-mentioned ultrafine denier antibacterial composite fiber is blended by ultrafine denier polyester fiber, flax fiber and nylon fiber, and the mass ratio of the ultrafine denier polyester fiber, flax fiber and nylon fiber is 3-5:3-5:1-3.

[0018] Linen fiber has good moisture absorption and breathability, antibacterial and bacteriostatic properties, UV resistance and antistatic properties, but poor hand feel, softness and wrinkle resistance. The ultrafine denier antibacterial composite fiber made of ultrafine denier polyester fiber, linen fiber and nylon fiber can solve the problems of hand feel, softness and wrinkle resistance, and also optimize the moisture absorption and breathability, antibacterial and bacteriostatic properties, UV resistance and antistatic properties. In terms of matching, combining chemical fibers with natural fibers can reduce costs.

[0019] Furthermore, in the above-mentioned ultrafine denier antibacterial composite fiber, the catalyst is one of S-21, S-24, S-PT, GeO2, C-94 or a mixture of more thereof, and the stabilizer is one of triphenyl phosphate, trimethyl phosphate, trimethyl phosphite, and polyphosphoric acid.

[0020] S-21, S-24, and S-PT are all antimony-based catalysts, GeO2 is a germanium-based catalyst, and C-94 is a titanium-silicon catalyst.

[0021] In order to obtain a more efficient catalytic effect, preferably, the catalyst is a mixed catalytic system of S-PT and GeO2, and the stabilizer is trimethyl phosphate. The S-PT and GeO2 catalytic system shared by antimony and germanium systems can increase the liquid and solid phase polycondensation speed of polyester by adding a small amount, and can improve the color and thermal stability of antibacterial polyester pellets by sharing with triphenyl phosphate.

[0022] The present invention also relates to a preparation process of the ultrafine denier antibacterial composite fiber, including the preparation of ultrafine denier polyester fiber and the blending of ultrafine denier antibacterial composite fiber; wherein the preparation of the ultrafine denier polyester fiber comprises the following steps:

[0023] (1) Preparation of antibacterial polyester pellets: terephthalic acid and ethylene glycol are added to a pulping kettle for stirring, and a catalyst and a stabilizer are added during the stirring process to obtain a slurry; the slurry in the pulping kettle is transferred to an esterification kettle for esterification, and after the first esterification is completed, the slurry is transferred to a diesterification kettle, and the nano ZnO dispersed slurry is added to the diesterification kettle, and then diesterification is performed; after the esterification is completed, the slurry is transferred to a polycondensation kettle for polymerization, firstly low vacuum polycondensation is performed, and then high vacuum polycondensation is performed, and after the polymerization is completed, the antibacterial polyester pellets are obtained through extrusion, pelletizing and drying steps;

[0024] (2) Melt spinning: The antibacterial polyester pellets are sequentially subjected to the steps of melting, conveying, spinning and spinning to obtain ultrafine denier polyester fibers.

[0025] The preparation of the ultra-fine denier polyester fiber is to first obtain antibacterial polyester pellets through an in-situ polymerization modification method, melt the antibacterial polyester pellets into a liquid melt, transport the liquid melt in a pipeline, and send it to a spinneret to be spun, solidify into solid yarn, and then change the physical properties of the solid yarn through spinning to obtain ultra-fine denier polyester fiber.

[0026] Furthermore, the preparation process of the above-mentioned ultra-fine denier antibacterial composite fiber, the preparation of the antibacterial polyester pellets, specifically includes the following steps: adding terephthalic acid and ethylene glycol to a pulping kettle for stirring, adding a catalyst and a stabilizer during the stirring process, and stirring until uniform to obtain a slurry; transferring the slurry in the pulping kettle to an esterification kettle for esterification, exhausting the air in the esterification kettle by filling and discharging nitrogen, raising the temperature to 240-280°C under 0.1-0.5MPa N2 protective gas, and the reaction time is 2 h; after the first esterification is completed, it is transferred to the second esterification kettle, and nano ZnO dispersed slurry is added at the same time, and the esterification reaction is carried out for another 2h; after the esterification is completed, it is transferred to the polycondensation kettle for polymerization, and the temperature of the polycondensation kettle is increased to 250-270°C, and low vacuum polycondensation is carried out first, and the low vacuum polycondensation time is 0.5-1h, and then the temperature of the polycondensation kettle is increased to 270-290°C at a heating rate of 5-8°C / min, and then high vacuum polycondensation is carried out. After the polymerization is completed, the antibacterial polyester pellets are obtained through extrusion, pelletizing and drying processes.

[0027] Furthermore, the preparation process of the above-mentioned ultrafine denier antibacterial composite fiber, the preparation of the nano ZnO dispersed slurry, specifically includes the following steps: adding nano ZnO and dispersant PCX-10 to distilled water, ultrasonically treating for 0.5-1h at room temperature, then adding ethylene glycol, continuing ultrasonic treatment for 0.5-1h, evaporating and dehydrating to obtain nano ZnO dispersed slurry.

[0028] Preferably, the nano ZnO is wurtzite nano zinc oxide, and its average particle size is 80-110 nm. With the above nano ZnO, with the aid of dispersant PCX-10 and ethylene glycol, a nano ZnO dispersion slurry with uniform nano ZnO dispersion and stable size can be prepared.

[0029] Further, in the preparation process of the ultra-fine denier antibacterial composite fiber, the characteristic viscosity of the melt obtained after the antibacterial polyester pellets are melted is 0.65-0.70 dL / g, and the temperature of the melt conveying is controlled at 282.5-283.5°C; the spinneret adopts a φ64mm spinneret with a hole diameter of 0.1-0.15mm, a hole depth of 0.3-0.5mm, and concentric holes; the spinning temperature is controlled at 290.5-291.5°C, and the spinning cooling adopts annular air cooling, and the wind pressure of the annular air cooling is 25-30Pa, and the wind The speed is 1.3-1.5m / s, the wind temperature is controlled at 20-23°C, the windless zone height of the annular air cooling is 35-45mm, and the relative humidity is controlled at 20%-22%; the spinning oiling adopts HL-106 oil agent and the oiling rate is controlled at 1.0-1.1%; the spinning stretching adopts a first hot roller-a second hot roller, the speed of the first hot roller is 2400-2450m / min, the temperature is controlled at 72-75°C, the speed of the second hot roller is 3550-3600m / min, and the temperature is controlled at 120-122°C.

[0030] In order to ensure that the single-filament linear density of the ultrafine denier polyester fiber produced by antibacterial polyester pelletizing is less than 0.4dtex, strict requirements are placed on its technical conditions. Therefore, during the preparation process, the characteristic viscosity of the melt, the temperature of the melt conveying (to ensure the uniformity of the melt viscosity), the design of the spinneret (to ensure the uniformity of the melt spinning), the temperature stability of the spinning, the uniformity and gentleness of the cooling blowing, and the reduction of the friction between the fiber and the air should be optimized according to the antibacterial polyester pelletizing.

[0031] Furthermore, the preparation process of the above-mentioned ultrafine denier antibacterial composite fiber, the blending of the ultrafine denier antibacterial composite fiber comprises the following steps:

[0032] (1) Front process: The ultra-fine denier polyester fiber is processed by a wool mixing machine and a wool combing machine in sequence, and then mixed with other fibers by a wool blending machine, and then processed by a first-pass and second-pass gill combing by a gill combing machine in sequence, and then processed by a combing machine, a first-pass and second-pass gill combing by a gill combing machine in sequence;

[0033] (2) Combing: The composite fiber is subjected to one-pass, two-pass, three-pass, and four-pass combing treatments of a combing machine to obtain an ultra-fine denier antibacterial composite fiber.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) The ultra-fine denier antibacterial composite fiber disclosed in the present invention is made by blending ultra-fine denier polyester fiber with other fibers, and can combine the different advantages of ultra-fine denier polyester fiber with wool fiber, flax fiber, lyocell fiber, and nylon fiber to achieve complementary performance, reduce the cost used, and make the fabric have more functions;

[0036] (2) The ultra-fine denier antibacterial composite fiber disclosed in the present invention is prepared by melt spinning of antibacterial polyester pellets, and has a linear density of less than 0.4 dtex. Compared with conventional polyester fibers, ultra-fine denier polyester fibers have extremely fine linear density, greatly reduced stiffness, increased specific surface area and capillary effect, and after being made into fabrics, the fluffiness and coverage of the fabrics are improved, the moisture permeability is improved, and the filling density is also improved, which can improve the warmth retention and is conducive to post-processing such as sanding;

[0037] (3) The ultra-fine denier antibacterial composite fiber disclosed in the present invention, the antibacterial polyester pellets are prepared by an in-situ polymerization modification method using terephthalic acid and ethylene glycol as raw materials, nano ZnO dispersion slurry as antibacterial agent, catalyst and stabilizer as auxiliary agents, the nano ZnO dispersion slurry includes nano ZnO, nano ZnO inorganic nano material, which has good effects in antibacterial and ultraviolet prevention, and the nano ZnO is dispersed into a nano ZnO dispersion slurry with a stable size and uniform size, and the disadvantages of poor washability and instability are avoided by an in-situ polymerization modification method, so as to obtain antibacterial polyester pellets with good spinnability, antibacterial and ultraviolet prevention functions;

[0038] (4) The preparation process of the ultrafine denier antibacterial composite fiber disclosed in the present invention is simple. During the preparation process, the characteristic viscosity of the melt, the temperature of the melt conveying (to ensure the uniformity of the melt viscosity), the design of the spinneret (to ensure the uniformity of the melt spinning), the temperature stability of the spinning, the uniformity and gentleness of the cooling air blowing, the reduction of the friction between the fiber and the air and other conditions are optimized according to the antibacterial polyester pellets. This can ensure that the single-filament linear density of the ultrafine denier polyester fiber obtained by using the antibacterial polyester pellets is less than 0.4 dtex. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a process flow chart of ultra-fine denier polyester fiber melt spinning of an ultra-fine denier antibacterial composite fiber according to the present invention; DETAILED DESCRIPTION

[0040] The following is a comparative example 1-5, embodiment 1-4 combined with specific experimental data and attached Figure 1, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0041] The following comparative examples 1-5 and Example 1 respectively provide a common polyester fiber, wool fiber (66-spin mercerized wool fiber), linen fiber (flax short hemp), lyocell fiber, nylon fiber (nylon 6), and ultrafine denier polyester fiber, which are tested in accordance with GB / T3916-2013 "Determination of breaking strength and elongation of single yarn of textile package yarn".

[0042] Comparative Example 1

[0043] Comparative Example 1 is ordinary polyester fiber, and its performance test results are shown in Table 1.

[0044] Table 1

[0045]

[0046] Comparative Example 2

[0047] Comparative Example 2 is 66-count mercerized wool fiber, and its performance test results are shown in Table 2.

[0048] Table 2

[0049] Linear density (pieces) Length(mm) Strength (cN / dtex) Elongation(%) Comparative Example 2 66 49.6 0.92 38.4

[0050] Comparative Example 3

[0051] Comparative Example 3 is flax short hemp, and its performance test results are shown in Table 3.

[0052] Table 3

[0053] Linear density (dtex) Length(mm) Strength (cN / dtex) Elongation(%) Comparative Example 3 15.51 77.9 515.01 4.62

[0054] Comparative Example 4

[0055] Comparative Example 4 is lyocell fiber, and its performance test results are shown in Table 4.

[0056] Table 4

[0057] Linear density (dtex) Length(mm) Strength (cN / dtex) Elongation(%) Comparative Example 4 1.67 38 4.06 15.81

[0058] Comparative Example 5

[0059] Comparative Example 5 is nylon 6, and its performance test results are shown in Table 5.

[0060] Table 5

[0061]

[0062]

[0063] Example 1

[0064] The preparation of the ultra-fine denier polyester fiber of Example 1 comprises the following steps:

[0065] (1) Preparation of antibacterial polyester pellets: The antibacterial polyester pellets include the following raw materials in parts by weight: 83 parts of terephthalic acid, 37 parts of ethylene glycol, 10 parts of nano ZnO dispersion slurry, 0.02 parts of trimethyl phosphate, S-PT 0.006 parts, GeO20.005 parts; add terephthalic acid and ethylene glycol to a pulping kettle and stir, add S-PT, GeO2 and trimethyl phosphate during the stirring process, stir until uniform to obtain a slurry; transfer the slurry in the pulping kettle to an esterification kettle for esterification, exhaust the air in the esterification kettle by filling and discharging nitrogen, increase the temperature to 255°C under 0.2MPa N2 protective gas, and the reaction time is 2h; after the first esterification is completed, transfer to a second esterification kettle, add nano ZnO dispersed slurry at the same time, and then carry out esterification reaction for 2h; after the esterification is completed, transfer to a polycondensation kettle for polymerization, the temperature of the polycondensation kettle is increased to 255°C, first carry out low vacuum polycondensation, the low vacuum polycondensation time is 1h, then the temperature of the polycondensation kettle is increased to 275°C at a heating rate of 5°C / min, and then carry out high vacuum polycondensation, after the polymerization is completed, the antibacterial polyester pellets are obtained through extrusion, pelletizing and drying processes;

[0066] (2) Melt spinning: The antibacterial polyester pellets are sequentially subjected to the steps of melting, conveying, spinning and spinning to obtain ultrafine denier polyester fibers.

[0067] The preparation of the nano ZnO dispersion slurry specifically includes the following steps: adding 0.2 kg of wurtzite nano zinc oxide and 0.03 kg of dispersant PCX-10 into 1 L of distilled water, ultrasonically treating for 0.5 h at room temperature, then adding 1 kg of ethylene glycol, continuing the ultrasonic treatment for 1 h, and evaporating and dehydrating to obtain the nano ZnO dispersion slurry.

[0068] The characteristic viscosity of the melt obtained after the antibacterial polyester pellets are melted is 0.672±0.05dL / g, and the temperature of the melt conveying is controlled at 283.0±0.5℃; the spinning adopts a φ64mm spinneret with a hole diameter of 0.1mm, a hole depth of 0.35mm, and concentric holes. Figure 1 , process parameters are shown in Table 6.

[0069] Table 6

[0070] Process parameters Spinning box temperature / ℃ 291 Initial pressure of component / MPa 11.0 Winding speed / (m·min-1) 3500 Ring wind speed / (m·s-1) 1.3 Wind temperature / ℃ 23 Oil type HL-106 Oil rack height / mm 750 Main network pressure / MPa 0.40 Pre-network pressure / MPa 0.05 Speed ​​of the first hot roller / (m·min-1) 2420 The first hot roller temperature / °C 75 Second hot roller speed / (m·min-1) 3500 Second hot roller temperature / ℃ 120

[0071] The performance test results of Example 1 are shown in Table 7.

[0072] Table 7

[0073] Linear density (dtex) Length(mm) Strength (cN / dtex) Elongation(%) Example 1 0.3 88 5.99 34.62

[0074] Antibacterial test: According to GB / T20944.3 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method", quantitative antibacterial tests were performed on Comparative Example 1 and Example 1. The test results showed that the antibacterial rates of Example 1 against Escherichia coli and Staphylococcus aureus reached 99.99%, and it had excellent antibacterial properties, while Comparative Example 1 had no antibacterial properties.

[0075] The following Examples 2-4 respectively provide a superfine denier polyester fiber / wool fiber / lyocell fiber, a superfine denier polyester fiber / wool fiber / nylon fiber composite fiber, and a superfine denier polyester fiber / linen fiber / nylon fiber composite fiber.

[0076] Example 2

[0077] The preparation of the ultra-fine denier polyester fiber / wool fiber / lyocell fiber of Example 2 comprises the following steps:

[0078] (1) Front stage: The ultra-fine denier polyester fiber is processed by a wool mixing machine and a wool combing machine in sequence, and then mixed with comparative example 2 (mercerized wool fiber) and comparative example 4 (lyocell fiber) in a wool blending machine according to a mass ratio of 40:30:30, and then processed by a first-pass and second-pass gill combing of a gill combing machine in sequence, and then processed by a combing machine, a first-pass and second-pass gill combing of a gill combing machine in sequence;

[0079] (2) Combing: The composite fiber is subjected to one-pass, two-pass, three-pass, and four-pass combing treatments of a combing machine to obtain Example 2.

[0080] Example 3

[0081] The preparation of the ultra-fine denier polyester fiber / wool fiber / nylon fiber composite fiber of Example 3 comprises the following steps:

[0082] (1) Front stage: The ultra-fine denier polyester fiber is processed by a wool mixing machine and a wool combing machine in sequence, and then mixed with comparative example 2 (mercerized wool fiber) and comparative example 5 (nylon fiber) in a mass ratio of 30:30:40 by a wool blending machine, and then processed by a first-pass and second-pass gill combing by a gill combing machine in sequence, and then processed by a combing machine, a first-pass and second-pass gill combing by a gill combing machine in sequence;

[0083] (2) Combing: The composite fiber is processed by a guillotine machine in sequence, i.e., one-pass, two-pass, three-pass, and four-pass to obtain Example 3.

[0084] Example 4

[0085] The preparation of the ultra-fine denier polyester fiber / flax fiber / nylon fiber composite fiber of Example 4 comprises the following steps:

[0086] (1) Front stage: The ultra-fine denier polyester fiber is processed by a wool mixing machine and a wool combing machine in sequence, and then mixed with comparative example 3 (flax) and comparative example 5 (nylon fiber) in a mass ratio of 30:40:20 by a wool blending machine, and then processed by a first-pass and second-pass gill combing by a gill combing machine in sequence, and then processed by a combing machine, a first-pass and second-pass gill combing by a gill combing machine;

[0087] (2) Combing: The composite fiber is processed by a guillotine machine in sequence, i.e., one-pass, two-pass, three-pass, and four-pass to obtain Example 3.

[0088] Effect verification:

[0089] The yarns with a count of 48*2Nm prepared in Example 2, Example 3, and Example 4 were tested in accordance with GB / T3916-2013 "Determination of Breaking Strength and Elongation at Break of Single Yarn of Textile Package Yarn", and the test results are shown in Table 8.

[0090] Table 8

[0091] Strength (cN / dtex) Elongation(%) Example 2 3.56 31.25 Example 3 3.63 45.38 Example 4 142.12 34.12

[0092] In addition, the fabrics of Example 2-4 were developed and trial-woven, and the fabric performance was tested. The seven indicators of the fabric bursting property, air permeability, moisture permeability, wear resistance, drape, antibacterial property, and anti-pilling property were tested. The tests showed that the bursting properties of the fabrics were as follows: the bursting properties of the fabrics prepared by Example 2-4 were better than those of pure lyocell fabric and pure wool fabric, the air permeability and moisture permeability of the fabrics prepared by Example 2-4 were better than those of pure ultra-fine denier polyester fabric and pure nylon fabric, the wear resistance of the fabrics prepared by Example 2-4 was better than that of pure lyocell fabric and pure wool fabric, the drape of the fabrics prepared by Example 2-4 was better than that of pure nylon fabric and pure linen fabric, the antibacterial property of the fabrics prepared by Example 2-4 was better than that of pure wool fabric, pure nylon fabric, pure linen fabric, and pure lyocell fabric, and the anti-pilling property of the fabrics prepared by Example 2-4 was better than that of pure nylon fabric and pure wool fabric.

[0093] The present invention has many specific application paths, and the above is only a preferred embodiment of the present invention. It should be pointed out that the above embodiments are only used to illustrate the present invention, and are not used to limit the protection scope of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, several improvements can also be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. An ultra-fine antibacterial composite fiber, characterized in that: The ultra-fine denier antibacterial composite fiber is blended by ultra-fine denier polyester fiber and other fibers, wherein the other fibers are a mixture of one or more of wool fiber, flax fiber, lyocell fiber and nylon fiber; the ultra-fine denier polyester fiber is prepared by melt spinning of antibacterial polyester pellets, and the linear density of the ultra-fine denier polyester fiber is less than 0.4 dtex; the antibacterial polyester pellets include the following raw materials in parts by weight: 80-85 parts of terephthalic acid, 36-38 parts of ethylene glycol, 10-15 parts of nano ZnO dispersion slurry, 0.01-0.05 parts of catalyst, and 0.01-0.05 parts of stabilizer; The preparation process of the ultra-fine denier antibacterial composite fiber includes the preparation of ultra-fine denier polyester fiber and the blending of the ultra-fine denier antibacterial composite fiber; The preparation of the ultra-fine denier polyester fiber comprises the following steps: (1) Preparation of antibacterial polyester pellets: terephthalic acid and ethylene glycol are added to a pulping kettle for stirring, and a catalyst and a stabilizer are added during the stirring process to obtain a slurry; the slurry in the pulping kettle is transferred to an esterification kettle for esterification, and after the first esterification is completed, the slurry is transferred to a diesterification kettle, and the nano ZnO dispersed slurry is added to the diesterification kettle, and then diesterification is carried out; after the esterification is completed, the slurry is transferred to a polycondensation kettle for polymerization, firstly low vacuum polycondensation is carried out, and then high vacuum polycondensation is carried out. After the polymerization is completed, the slurry is extruded, pelletized and dried to obtain antibacterial polyester pellets; (2) Melt spinning: The antibacterial polyester pellets are sequentially subjected to the steps of melting, conveying, spinning and spinning to obtain ultrafine denier polyester fibers; The blending of the ultrafine denier antibacterial composite fiber comprises the following steps: (1) Front stage: The ultra-fine denier polyester fiber is processed by a wool blending machine and a wool combing machine in sequence, and then mixed with other fibers by a wool blending machine, and then processed by a first-stage and second-stage gill combing by a gill combing machine in sequence, and then processed by a combing machine, a first-stage and second-stage gill combing by a gill combing machine in sequence; (2) Combing: The composite fiber is processed by a combing machine in sequence of one-pass, two-pass, three-pass, and four-pass to obtain an ultra-fine denier antibacterial composite fiber.

2. The ultrafine denier antibacterial composite fiber according to claim 1, characterized in that: The superfine denier antibacterial composite fiber is blended by superfine denier polyester fiber, wool fiber and lyocell fiber, and the mass ratio of the superfine denier polyester fiber, wool fiber and lyocell fiber is 3-5:3-5:1-3.

3. The ultrafine denier antibacterial composite fiber according to claim 1, characterized in that: The superfine denier antibacterial composite fiber is blended by superfine denier polyester fiber, wool fiber and nylon fiber, and the mass ratio of the superfine denier polyester fiber, wool fiber and nylon fiber is 3-5:2-4:2-4.

4. The ultrafine denier antibacterial composite fiber according to claim 1, characterized in that: The ultra-fine denier antibacterial composite fiber is blended by ultra-fine denier polyester fiber, flax fiber and nylon fiber, and the mass ratio of the ultra-fine denier polyester fiber, flax fiber and nylon fiber is 3-5:3-5:1-3.

5. The ultrafine denier antibacterial composite fiber according to claim 1, characterized in that: The catalyst is one of S-21, S-24, GeO2, and C-94 or a mixture of more thereof, wherein S-21 and S-24 are antimony-based catalysts, and C-94 is a titanium silicon catalyst. The stabilizer is one of triphenyl phosphate, trimethyl phosphate, trimethyl phosphite, and polyphosphoric acid.

6. The ultrafine denier antibacterial composite fiber according to claim 1, characterized in that: The preparation of the antibacterial polyester pellets specifically includes the following steps: adding terephthalic acid and ethylene glycol to a pulping kettle for stirring, adding a catalyst and a stabilizer during the stirring process, and stirring until uniform to obtain a slurry; transferring the slurry in the pulping kettle to an esterification kettle for esterification, exhausting the air in the esterification kettle by filling and discharging nitrogen, raising the temperature to 240-280°C under 0.1-0.5 MPa N2 protective gas, and the reaction time is 2 hours; after the first esterification is completed, transferring to a second esterification kettle, adding nano ZnO dispersed slurry at the same time, and then performing an esterification reaction for 2 hours; after the esterification is completed, transferring to a polycondensation kettle for polymerization, the temperature of the polycondensation kettle is raised to 250-270°C, firstly performing low vacuum polycondensation, the low vacuum polycondensation time is 0.5-1 hour, and then the temperature of the polycondensation kettle is raised to 270-290°C at a heating rate of 5-8°C / min, and then performing high vacuum polycondensation, and after the polymerization is completed, extruding, pelletizing and drying processes are carried out to obtain antibacterial polyester pellets.

7. The ultrafine denier antibacterial composite fiber according to claim 1, characterized in that: The preparation of the nano ZnO dispersion slurry specifically includes the following steps: adding nano ZnO and dispersant PCX-10 into distilled water, ultrasonically treating for 0.5-1 h at room temperature, then adding ethylene glycol, ultrasonically treating for 0.5-1 h, and evaporating and dehydrating to obtain the nano ZnO dispersion slurry.

8. The ultrafine denier antibacterial composite fiber according to claim 1, characterized in that: The characteristic viscosity of the melt obtained after the antibacterial polyester pellets are melted is 0.65-0.70dL / g, and the temperature of the melt conveying is controlled at 282.5-283.5°C; the spinneret adopts a φ64 mm spinneret with a hole diameter of 0.1-0.15mm, a hole depth of 0.3-0.5 mm, and concentric plate holes; the spinning temperature is controlled at 290.5-291.5°C, and the spinning cooling adopts annular air cooling, the wind pressure of the annular air cooling is 25-30Pa, the wind speed is 1.3-1.5m / s, and the wind temperature is controlled at 20-23°C, the windless zone height of the annular air cooling is 35-45mm, and the relative humidity is controlled at 20%-22%; the spinning oiling adopts HL-106 The spinning stretching adopts a first hot roller-a second hot roller, the speed of the first hot roller is 2400-2450 m / min, the temperature is controlled at 72-75°C, the speed of the second hot roller is 3550-3600 m / min, and the temperature is controlled at 120-122°C.

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