Antistatic acrylic fiber blended yarn and preparation method thereof

Abstract

The invention discloses an antistatic acrylic fiber blended yarn and a preparation method thereof. The antistatic acrylic fiber blended yarn comprises the following components in parts by weight: 100-120 parts of polyacrylonitrile stock solution, 3.5-6 parts of polyethylene glycol, 5-8 parts of conductive mother solution, 0.8-1.5 parts of nano zinc oxide, 25-30 parts of bamboo fiber and 8-15 parts of silver antibacterial polyester. The preparation method comprises the following steps: carrying out ball milling on the modified carbon nanotubes, polyacrylamide and lignosulfonate to prepare conductive mother liquor; blending the polyacrylonitrile stock solution with the conductive mother solution, nano zinc oxide, bamboo fibers and silver fibers, and performing high-speed shearing emulsification and double-screw mixing defoaming to obtain a spinning solution; fibers are formed through low-temperature wet spinning, multi-stage drafting and antistatic silicone oil dipping; optimizing spinning parameters and controlling humidity to weave yarns; finally, acid dye is adopted for dyeing, a finishing solution prepared from a fluorine-containing antistatic agent and a cross-linking agent is used for padding and baking, and the antistatic blended yarn with the electrical conductivity and the dyeing stability is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of fabrics, in particular to an antistatic acrylic blended yarn and a preparation method thereof. Background Art

[0002] With the rapid development of the textile industry, acrylic fiber has become an important raw material in the fields of autumn and winter clothing and home textiles due to its excellent fluffiness, warmth retention and wool-like texture. However, its inherent hydrophobicity leads to a prominent problem of static electricity accumulation. Especially in dry environments, static electricity not only causes clothing to absorb dust and feel uncomfortable to wear, but may also cause electronic equipment failures and even industrial safety hazards. For example, patent CN103255634A (a polyacrylonitrile / polyaniline composite conductive fiber) uses a metal fiber blend, but the fiber has high rigidity and weak cohesion, resulting in uneven distribution during the spinning process, affecting the strength and appearance of the finished product. Although the industry has proposed a variety of antistatic modification technologies, the existing solutions generally have performance limitations and process defects. The existing technology often uses wet spinning stretching baths and adopts antistatic agent spraying or impregnation processes. Although it can improve conductivity in the short term, the antistatic agent is easily lost due to washing or friction, and the effect drops sharply in a low humidity environment, and may damage the mechanical properties of the fiber; it is difficult to meet the current textile market's urgent demand for antistatic acrylic blended yarns to shift from single functions to multi-dimensional performance integration. People need long-term antistatic and high comfort coexisting, adaptable to dyeing, compatible with process and environmentally friendly antistatic acrylic blended yarns. Therefore, there is a need to develop a new type of antistatic acrylic blended yarn and its preparation method on the market. Summary of the Invention

[0003] To achieve the above-mentioned purpose, the present invention provides an antistatic acrylic blended yarn and a preparation method thereof, which solves the above-mentioned technical problems.

[0004] The invention provides an antistatic blended yarn comprising the following components: polyacrylonitrile stock solution, polyethylene glycol, conductive mother solution, nano zinc oxide, bamboo fiber and silver-based antibacterial polyester.

[0005] Furthermore, the invention comprises the following components in parts by weight: 100-120 parts of polyacrylonitrile stock solution, 3.5-6 parts of polyethylene glycol, 5-8 parts of conductive mother solution, 0.8-1.5 parts of nano zinc oxide, 25-30 parts of bamboo fiber and 8-15 parts of silver-based antibacterial polyester.

[0006] Furthermore, the conductive mother solution includes modified carbon nanotubes, polyacrylamide and lignin sulfonate.

[0007] Furthermore, the conductive mother solution comprises, by weight, 1.2-1.8 parts of modified carbon nanotubes, 1.8-2.7 parts of polyacrylamide, and 0.6-0.9 parts of lignin sulfonate.

[0008] Furthermore, the modified carbon nanotubes have a carboxyl functional group density of ≥0.8 mmol / g, a dispersion D90 particle size of ≤200 nm, and are coated with polydopamine to form a core-shell structure.

[0009] Furthermore, the silver-based antibacterial polyester is a silver / titanium dioxide composite antibacterial fiber with a silver loading of 0.5-1.0wt% and an antibacterial rate of ≥99%.

[0010] The present invention provides a method for preparing an antistatic blended yarn, comprising the following steps: S1, preparing a conductive mother solution: adding modified carbon nanotubes, polyacrylamide and lignin sulfonate to deionized water and ultrasonically milling for 5 hours to prepare a suspension with a solid content of 12%;

[0011] S2. Blending spinning solution: preheat the polyacrylonitrile solution to 65°C, add polyethylene glycol grafting agent and stir, add conductive mother solution and nano zinc oxide, raise the temperature to 75°C, emulsify at high speed shear, add bamboo fiber and silver antibacterial polyester, and mix for 25 minutes;

[0012] S3. Wet spinning: The coagulation bath is DMAC / water, the flow rate is 2.5 m / min, the temperature is -5 °C, three-stage countercurrent 6 water washing is used, the washing rate is 15 m / min, and the antistatic silicone oil containing Dow Corning DC-193 is impregnated for 30 s.

[0013] Furthermore, the following steps are included: S4, blended yarn weaving: calibrate the distance between the cylinder and the cover plate, the speed of the licker-in roller is 750rpm, the cotton roll weight is 45g / m, turn on the 8kV static elimination system, maintain the humidity in the operating area at 65%RH, perform the first drawing and drafting, which is 6.2 times stretching, perform the last drawing and drafting, which is 5.8 times secondary stretching, set the roller spacing in stages to 45mm for the front section, 50mm for the middle section and 55mm for the rear section, assemble the OSS 8 / 0 type wire ring, start the three-roller drive system, activate the 15,000 rpm spindle, apply 820 twists / m, synchronize the winding device, and match the line speed of 15 meters / minute.

[0014] Furthermore, the method further includes the following steps: S5, dyeing and antistatic treatment: using 1.5% of acid red GRL as dye, dyeing the product obtained in step S4 at 40°C, soaping with detergent LS at 80°C for 15 minutes to obtain antistatic blended yarn after dye treatment, and padding the dye-treated antistatic blended yarn with 3% of fluorine-containing antistatic agent Chemstat 1220 and 1.5% of cross-linking agent epichlorohydrin at 0.3MPa, and baking at 130°C for 2.5 minutes to obtain antistatic blended yarn.

[0015] Furthermore, the hot air circulation speed of the baking process in step S5 is 15 m / s, and the weight ratio of the cross-linking agent epichlorohydrin to the fluorine-containing antistatic agent is 1:2.

[0016] The antistatic acrylic blended yarn and preparation method thereof proposed in the present invention have the following beneficial effects:

[0017] 1. The antistatic blended yarn of the present application has high and long-lasting antistatic properties, constructs a conductive network, and forms a dual antistatic mechanism of "three-dimensional conductive path + surface moisture absorption layer" through the synergistic effect of modified carbon nanotubes and bamboo fibers. The surface resistivity is lower than that of traditional metal blended yarns. The antistatic blended yarn also has excellent dyeing adaptability, and the reactive dye carrier improves the dyeing rate of acid dyes. It also has good process compatibility and adopts a low-temperature coagulation bath and gradient drafting to meet the requirements of high-speed ring spinning. No heavy metals are added throughout the process, the wastewater COD value is low, and no heavy metal residues are detected, which meets green manufacturing standards and is environmentally friendly.

[0018] 2. This application uses acid dye Acid Red GRL and crosslinking agent epichlorohydrin for treatment, which has good wet friction color fastness, high dye uptake and good color uniformity;

[0019] 3. This application demonstrates high mechanical performance and process compatibility, with a single fiber breaking strength of 3.5 cN / dtex, a fabric tear strength of 28 N, and an elongation at break of 25%, meeting the requirements of high-speed spinning. Low-temperature wet spinning (-5°C coagulation bath) and a multi-stage drafting process (total draft ratio of 5.76) contribute to the optimization of fiber structure. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0021] Unless otherwise specified, the examples and comparative examples are parallel tests with the same components, component contents, preparation steps, and preparation parameters. The test methods in the following examples are conventional methods unless otherwise specified. The test materials used in the following examples are purchased from commercial channels unless otherwise specified.

[0022] Unless otherwise stated, all reagents were used as received without further purification.

[0023] In the preparation examples and embodiments of the present invention, "parts" are parts by weight unless otherwise specified, and concentration percentages are concentrations by weight unless otherwise specified.

[0024] Polyacrylonitrile stock solution is from Japan Toray AN-22; modified carbon nanotubes are CABOT BLACK from the United States 480 (polydopamine modified); bamboo fiber is Anhui Fengyuan Biotechnology FY-BF80 (120 mesh); silver antibacterial polyester is DuPont of the United States 3GT-Ag (silver loading 0.8 wt%); polyethylene glycol grafting agent is from BASF, Germany E 4000; Nano zinc oxide is Nano-ZnO-50 from the United States; Polyacrylamide is from FOAMER, France TM 420; lignin sulfonate is from Norwegian Borrego CA; antistatic silicone oil is Dow Corning DOW DC-193; Acid Red GRL dye is from Huntsman, Switzerland RedGRL.

[0025] Example 1

[0026] This embodiment provides a method for preparing an antistatic blended yarn, comprising the following specific steps:

[0027] S1. Preparation of conductive mother solution: 1.2 parts of modified carbon nanotubes, 1.8 parts of polyacrylamide and 0.6 parts of lignin sulfonate were added to deionized water and ultrasonically ball milled for 5 hours to prepare a conductive mother solution with a solid content of 12%;

[0028] S2. Blended spinning solution: 110 parts of polyacrylonitrile solution (DMAC solvent, solid content 22%) were preheated to 65°C, 4.5 parts of polyethylene glycol grafting agent were added, and the mixture was stirred at 600 rpm for 30 min. 6 parts of conductive mother solution and 1.2 parts of nano zinc oxide were added. The mixture was heated to 75°C and switched to a high-speed shear emulsifier at 12,000 rpm for 45 min. 28 parts of bamboo fiber and 12 parts of silver-based antibacterial polyester were added. A twin-screw mixer (L / D = 40:1, screw speed 80 rpm) was used for mixing for 25 min. The mixture was allowed to stand for degassing at a vacuum degree of -0.095 MPa and a temperature of 60°C for 48 h. The viscosity was controlled at 4500 mPa·s.

[0029] S3. Wet spinning: DMAC / water = 35 / 65 (v / v) was used as the coagulation bath solvent at a flow rate of 2.5 m / min. The coagulation bath was maintained at -5°C, with a primary draft (in-bath draft) ratio of 1.8x at 50°C; a secondary draft ratio of 3.2x at 92°C, for a total draft ratio of 5.76x. Washing was performed using a three-stage countercurrent flow of 60°C → 45°C → 25°C at a rate of 15 m / min. The fibers were impregnated with antistatic silicone oil (Dow Corning DC-193, 1.2%) for 30 s and a 75% squeeze-out rate.

[0030] S4, blended yarn braiding: Calibrate the cylinder-flat clearance to 0.18 mm, set the licker-in speed to 750 rpm, configure the lap delivery rate to 45 g / m, start the 8 kV static elimination system, maintain the operating area humidity at 65% RH, perform the first draw draft at 6.2 times, perform the final draw draft at 5.8 times, set the roller spacing in stages to 45 mm in the front, 50 mm in the middle, and 55 mm in the rear. Install the OSS 8 / 0 traveller, start the three-roller drive system, activate the 15,000 rpm spindle, apply 820 twists / m, synchronize the winding device, and match the line speed of 15 m / min.

[0031] S5. Dyeing and antistatic treatment: Acid red GRL 1.5% (owf) with a pH of 4.5 (adjusted with acetic acid) and a bath ratio of 1:15 was used as the dye. The product obtained in step S4 was dyed at 40°C, raised to 98°C at 1°C / min, kept warm for 50 minutes, washed with cold water, and soaped with 1 g / L of detergent LS at 80°C for 15 minutes to obtain the dye-treated antistatic blended yarn. A finishing solution was prepared with 3 parts of a fluorine-containing antistatic agent, Chemstat 1220, and 1.5 parts of a cross-linking agent, epichlorohydrin. The dye-treated antistatic blended yarn was padded at 0.3 MPa, with a hot air circulation speed of 15 m / s, and baked at 130°C for 2.5 minutes to obtain the antistatic blended yarn.

[0032] Example 2

[0033] This embodiment provides a method for preparing an antistatic blended yarn, comprising the following specific steps:

[0034] S2, blended spinning solution: 100 parts of polyacrylonitrile stock solution (DMAC solvent, solid content 22%) were preheated to 65 ° C, 3.5 parts of polyethylene glycol grafting agent were added, and the mixture was stirred at 600 rpm for 30 min. 5 parts of conductive mother liquor and 0.8 parts of nano zinc oxide were added, and the temperature was raised to 75 ° C. The mixture was switched to a high-speed shear emulsifier and continued at 12000 rpm for 45 min. 25 parts of bamboo fiber and 8 parts of silver antibacterial polyester were added. A twin-screw mixer (L / D = 40:1, screw speed 80 rpm) was used for 25 min of mixing. The mixture was allowed to stand for degassing at a vacuum degree of -0.095 MPa and a temperature of 60 ° C for 48 h. The viscosity was controlled at 4500 mPa s. Other contents were consistent with Example 1.

[0035] Example 3

[0036] This embodiment provides a method for preparing an antistatic blended yarn, comprising the following specific steps:

[0037] S2, blended spinning solution: 120 parts of polyacrylonitrile stock solution (DMAC solvent, solid content 22%) were preheated to 65 ° C, 6 parts of polyethylene glycol grafting agent were added, and the mixture was stirred at 600 rpm for 30 min. 8 parts of conductive mother liquor and 1.5 parts of nano zinc oxide were added, and the temperature was raised to 75 ° C. The mixture was switched to a high-speed shear emulsifier and continued at 12000 rpm for 45 min. 30 parts of bamboo fiber and 15 parts of silver antibacterial polyester were added. A twin-screw mixer (L / D = 40:1, screw speed 80 rpm) was used for 25 min of mixing. The mixture was allowed to stand for degassing at a vacuum degree of -0.095 MPa and a temperature of 60 ° C for 48 h. The viscosity was controlled at 4500 mPa s. Other contents were consistent with Example 1.

[0038] Comparative Example 1

[0039] The difference from Example 1 is the lack of an equal weight portion of conductive mother liquid, and the other parts are the same.

[0040] Comparative Example 2

[0041] The difference from Example 1 is that the nano zinc oxide in equal parts by weight is missing, and the other parts are the same.

[0042] Comparative Example 3

[0043] The difference from Example 1 is the lack of bamboo fiber in equal parts by weight, and the other parts are the same.

[0044] Comparative Example 4

[0045] The difference from Example 1 is that the silver-based antibacterial polyester is missing in equal parts by weight, and the other parts are the same.

[0046] Performance Testing

[0047] 1. Tests for resistivity and color fastness: At a temperature of 25 ° C and a humidity of 65%, the resistivity of the blended yarns prepared in the examples and comparative examples was tested in accordance with ASTM D257, using an EST121 digital high resistance meter, an electrode spacing of 50 mm, and a test voltage of 100 V; the blended yarns prepared in the examples and comparative examples were subjected to an electrostatic voltage half-life test in accordance with GB / T12703.1-2021, using a YG342E fabric static tester, the sample was charged to ±5 kV, and the time required for the voltage to decay to 1 / 2 was recorded; the blended yarns prepared in the examples and comparative examples were tested for color fastness to rubbing in accordance with ISO 105-X12, using an LFY-304 rubbing color fastness tester, wet rubbing 10 times, a pressure of 9 N, a stroke of 100 mm, grades 1-5, and grade 5 being the best. The results are shown in Table 1.

[0048] Table 1

[0049]

[0050] 2. Mechanical Properties and Environmental Friendliness Tests: The blended yarns prepared in the Examples and Comparative Examples were tested for single fiber breaking strength according to ASTM D3822. The blended yarns prepared in the Examples and Comparative Examples were tested for fabric tearing strength according to GB / T 3923.1-2013 using an INSTRON 5967 universal material testing machine with a tensile rate of 500 mm / min and a clamping distance of 20 mm. The results are shown in Table 2.

[0051] Table 2

[0052]

[0053] The chemical oxygen demand and heavy metal content (silver ion) of the wastewater of Example 1 were tested according to GB 4287-2012. The instruments used for the test were a HACH DR6000 spectrophotometer and an ICP-MS (Agilent 7900). The COD of Example 1 was tested to be 78 mg / L, and no silver ions were detected. The COD of the wastewater of Example 1 was ≤80 mg / L, and no heavy metal residues were found, meeting the green manufacturing requirements.

[0054] While the specific embodiments of the present invention have been described in detail above, these are merely exemplary and the present invention is not limited thereto. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, any equivalent changes and modifications made without departing from the spirit and scope of the present invention are intended to be encompassed within the scope of the present invention.

Claims

1. An antistatic blended yarn, characterized in that: The invention comprises the following components: polyacrylonitrile stock solution, polyethylene glycol, conductive mother solution, nano zinc oxide, bamboo fiber and silver-based antibacterial polyester.

2. The antistatic blended yarn according to claim 1, characterized in that: The invention comprises the following components by weight: 100-120 parts of polyacrylonitrile stock solution, 3.5-6 parts of polyethylene glycol, 5-8 parts of conductive mother solution, 0.8-1.5 parts of nano zinc oxide, 25-30 parts of bamboo fiber and 8-15 parts of silver-based antibacterial polyester.

3. The antistatic blended yarn according to claim 1, characterized in that: The conductive mother solution comprises modified carbon nanotubes, polyacrylamide and lignin sulfonate.

4. The antistatic blended yarn according to claim 1, characterized in that: The conductive mother solution comprises, by weight, 1.2-1.8 parts of modified carbon nanotubes, 1.8-2.7 parts of polyacrylamide and 0.6-0.9 parts of lignin sulfonate.

5. The antistatic blended yarn according to claim 3, characterized in that: The modified carbon nanotubes have a carboxyl functional group density of ≥0.8 mmol / g, a dispersion liquid D90 particle size of ≤200 nm, and are coated with polydopamine to form a core-shell structure.

6. The antistatic blended yarn according to claim 1, characterized in that: The silver-based antibacterial polyester is a silver / titanium dioxide composite antibacterial fiber with a silver loading of 0.5-1.0 wt% and an antibacterial rate of ≥99%.

7. A method for preparing the antistatic blended yarn according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Preparation of conductive mother solution: Add modified carbon nanotubes, polyacrylamide and lignin sulfonate to deionized water and ultrasonically ball mill for 5 h to prepare a suspension with a solid content of 12%; S2. Blending spinning solution: preheat the polyacrylonitrile solution to 65°C, add polyethylene glycol grafting agent and stir, add conductive mother solution and nano zinc oxide, raise the temperature to 75°C, emulsify at high speed shear, add bamboo fiber and silver antibacterial polyester, and mix for 25 minutes; S3. Wet spinning: The coagulation bath is DMAC / water, the flow rate is 2.5 m / min, the temperature is -5 °C, three-stage countercurrent 6 water washing is used, the washing rate is 15 m / min, and the antistatic silicone oil containing Dow Corning DC-193 is impregnated for 30 s.

8. The preparation method according to claim 7, characterized in that The following steps are also included: S4. Blended Yarn Weaving: Calibrate the cylinder-flat spacing, set the licker-in speed to 750 rpm, set the lap weight to 45 g / m, turn on the 8 kV static elimination system, maintain the operating area humidity at 65% RH, perform the first draw draft at 6.2 times, and the final draw draft at 5.8 times. Set the roller spacing in stages to 45 mm for the front section, 50 mm for the middle section, and 55 mm for the rear section. Install the OSS 8 / 0 wire traveler, start the three-roller drive system, activate the 15,000 rpm spindle, apply 820 twists / m, and synchronize the winding device to match a line speed of 15 m / min.

9. The preparation method according to claim 7, characterized in that The following steps are also included: S5. Dyeing and antistatic treatment: Using 1.5% of acid red GRL as dye, the product obtained in step S4 was dyed at 40°C, and soaped with detergent LS at 80°C for 15 minutes to obtain dye-treated antistatic blended yarn, and the dye-treated antistatic blended yarn was padded with 3% of fluorine-containing antistatic agent Chemstat 1220 and 1.5% of cross-linking agent epichlorohydrin at 0.3 MPa, and baked at 130°C for 2.5 minutes to obtain antistatic blended yarn.

10. The preparation method according to claim 9, characterized in that The hot air circulation speed of the baking process in step S5 is 15 m / s, and the weight ratio of the cross-linking agent epichlorohydrin to the fluorine-containing antistatic agent is 1:2.

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