A method for preparing antistatic fluorescent multifunctional polyester fiber

Abstract

This application provides a method for preparing antistatic fluorescent multifunctional polyester fiber, belonging to the field of melt spinning technology. White polyester chips are fed into a mixing hopper via a main feed hopper, a first functional chip is fed into the mixing hopper via a first distribution hopper, and a second functional chip is fed into a small screw via a second distribution hopper. The process involves melt extrusion and spinning. The first functional chip is an antistatic masterbatch with polyether ester as a carrier, and the second functional chip is a whitening agent PS-1. A signal feedback device for detecting changes in volume resistivity and color difference is installed before the winding process to control the addition rate and amount of the first and second functional chips. The resulting antistatic fluorescent polyester fiber has a breaking strength of 93.6 N, a breaking strength of 8.43 cN / dtex, a breaking elongation of 12.6%, and a volume resistivity of 5.8 × 10⁻⁶. 10 Ω·cm, dust absorption height <0.5cm.

Description

Technical Field

[0001] This application relates to a method for preparing antistatic fluorescent multifunctional polyester fiber, belonging to the field of melt spinning technology. Background Technology

[0002] Currently, in the spinning of functional fibers, white polyester chips are often extruded and melted to form a melt, and then functional components are injected through a small screw (e.g., CN102787376A) to achieve the addition of functional components through melt mixing; or, as shown in CN214612856U, white polyester chips are first mixed with functional components and then melt-extruded into fibers. Both of these methods have the drawbacks of being limited in their implementation methods and the limited number of functions that can be achieved; moreover, when some masterbatches have poor heat resistance and pressure resistance, it is difficult to achieve good results through a single method, such as color masterbatches and fluorescent masterbatches, where the added color pigments and fluorescent components are mostly organic components, and their heat resistance is usually poor. Summary of the Invention

[0003] In view of this, this application provides a preparation process for multifunctional polyester fibers, which can adjust the amount of front-end functional components added in a timely manner to achieve uniformity of product quality.

[0004] Specifically, this application is implemented in the following ways:

[0005] A process for preparing multifunctional polyester fiber uses white polyester chips and first functional chips as main materials and second functional chips as auxiliary materials. White polyester chips are supplied to the main material silo, and first functional chips are supplied to the distribution silo. The two are mixed in a mixing silo and then fed into the main screw for melt extrusion to form a melt. At the same time, the second functional chips are extruded into a melt by a small screw and mixed with the extruded melt from the main screw. The melt is then fed into the spinning process. Control systems are set up between the mixing silo and the main material silo, between the mixing silo and the distribution silo, and between the small screw and the main screw to monitor the supplied white polyester chips, first functional chips, and second functional chip extruded melts online.

[0006] The above-mentioned process in this application mainly uses white polyester chips and first functional chips, supplemented by second functional chips. By adding commonly used white polyester chips and first functional chips, and adjusting different second functional chips, polyester fibers with different effects can be processed. In the above process, the amount of white polyester chips and first functional chips added is relatively large, and they are also the two components that have the most significant impact on melt performance in production. The two are mixed and then dissolved, which can effectively control product quality. When a relatively small amount of second functional chips is added to the melt, the addition of the second component can be achieved. Due to the above-mentioned special settings of the addition amount and addition state, its addition will not cause melt pressure fluctuations, thereby realizing flexible production and processing with multiple functions.

[0007] Furthermore, as a preferred option:

[0008] When the first functional slice is dried to a moisture content of ≤0.4% by the first drying unit, it is added to the mixing bin. When the second functional slice is dried to a moisture content of ≤0.4% by the second drying unit, it is fed into the small screw for extrusion and melting.

[0009] The small screw can be a single screw or a twin screw.

[0010] The main screw has four spinning positions, each corresponding to a small screw.

[0011] The first functional slice is any one of flame retardant masterbatch, antibacterial masterbatch, UV-resistant masterbatch, fluorescent masterbatch, and color masterbatch, and the second functional slice is any one of flame retardant masterbatch, antibacterial masterbatch, UV-resistant masterbatch, fluorescent masterbatch, color masterbatch, and antistatic masterbatch, and the first functional slice and the second functional slice are different.

[0012] The spinning process is equipped with a signal feedback device, which is connected to each control system. Based on the fiber condition, before the fiber is packaged and formed, the signal feedback device monitors functional indicators online. For example, the flame retardant component can be obtained by monitoring the phosphorus content of the phosphorus element, the antistatic component can be obtained by monitoring the resistance change, the antibacterial component can be obtained by monitoring the silver content of the silver element, the UV resistance can be detected by detecting the spectral transmittance change, and the color difference signal can be obtained by online colorimetry for colorimetry, so as to adjust the feed amount and feed speed accordingly.

[0013] Below are some specific examples of multifunctional polyester fibers.

[0014] The multifunctional polyester fiber is a colored fluorescent functional polyester fiber. The white polyester chips are polyester chips with an intrinsic viscosity of 0.85-1.25 dl / g and a moisture content of ≤40 ppm, with a feeding speed of 1.5-15 tons / h. The first functional chip is a color masterbatch with a moisture content of ≤40 ppm, and the addition amount is 2-5% of the mass of the white polyester chips. The screw extrusion temperature is 270-290℃. The second functional chip is a fluorescent masterbatch with an intrinsic viscosity of 0.3-0.7 dl / g and a moisture content of <0.5%. The small screw extrusion temperature is 238-270℃, the addition amount of fluorescent masterbatch relative to the white polyester chips is 60-250 ppm, and the draw ratio is 5.4-6.0.

[0015] The multifunctional polyester fiber is a colored flame-retardant functional polyester fiber. The white polyester chips are polyester chips with an intrinsic viscosity of 0.85-1.25 dl / g, a moisture content of ≤40 ppm, and a feeding speed of 1.5-30 tons / h. The first functional chip is a flame-retardant masterbatch with a moisture content of ≤40 ppm, an intrinsic viscosity of 0.85-1.25 dl / g, a phosphorus content of 5000-100000 ppm, and a feeding speed of 5 kg-3000 kg / h. The screw extrusion temperature is... 230-320℃; the second functional chip is a color masterbatch with an intrinsic viscosity of 0.3-0.7 dl / g and a moisture content of <0.5%; the small screw extrusion temperature is 240-300℃, the output melt speed is 5kg-3000kg / h, the output melt ratio relative to the main screw is ≤5%, and the injection pressure is greater than the main screw pressure; a signal feedback device for detecting phosphorus content and color difference is set before the winding process in the spinning process to control the addition rate and amount of the first and second functional masterbatches.

[0016] The multifunctional polyester fiber is an antistatic fluorescent functional polyester fiber. The white polyester chips are polyester chips with an intrinsic viscosity of 0.85-1.25 dl / g, a moisture content of ≤40 ppm, and a feeding speed of 1.5-15 tons / h. The first functional chip is an antistatic masterbatch with a moisture content of ≤40 ppm and a feeding speed of 1 kg-1000 kg / h. The screw extrusion temperature is 230-320℃. The second functional chip is a fluorescent masterbatch with an intrinsic viscosity of 0.3-0.7 dl / g and a moisture content of <0.5%. The small screw extrusion temperature is 240-300℃, the output melt speed is 5 kg-3000 kg / h, the output melt ratio relative to the main screw is ≤5%, and the injection pressure is greater than the main screw pressure. A signal feedback device for detecting resistance changes and color difference (or whiteness) is set before the winding process in the spinning process to control the addition speed and amount of the first and second functional masterbatches.

[0017] The multifunctional polyester fiber is an anti-UV and antibacterial polyester fiber. The white polyester chips are polyester chips with an intrinsic viscosity of 0.85-1.25 dl / g, a moisture content of ≤40 ppm, and a feeding speed of 1.5-15 tons / h. The first functional chip is an anti-UV masterbatch with a moisture content of ≤40 ppm and a feeding speed of 1 kg-1000 kg / h. The screw extrusion temperature is 230-320℃. The second functional chip is an antibacterial masterbatch with an intrinsic viscosity of 0.3-0.7 dl / g, a silver ion content of 200-8000 ppm, and a moisture content of <0.5%. The small screw extrusion temperature is 240-300℃, the output melt speed is 5 kg-3000 kg / h, the output melt ratio relative to the main screw is ≤5%, and the injection pressure is greater than the main screw pressure. A signal feedback device for detecting changes in spectral transmittance and silver content is set before the winding process in the spinning process to control the addition rate and amount of the first and second functional masterbatches. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process flow of this application.

[0019] The diagram is labeled as follows: 1. Main material bin; 11. First control system; 2. Distribution bin one; 3. Distribution bin two; 4. Mixing bin; 5. Main screw; 6. Drying mechanism one; 61. Second control system; 7. Drying mechanism two; 8. Small screw; 81. Third control system. Detailed Implementation

[0020] Example 1

[0021] This embodiment describes the preparation of 1000D colored flame-retardant functional polyester fiber.

[0022] (1) Raw materials: White polyester chips are polyester chips with an intrinsic viscosity of 1.05dl / g and a moisture content of 10ppm; the first functional chip is flame retardant masterbatch (phosphorus flame retardant) with an intrinsic viscosity of 0.95dl / g and a phosphorus content of 44,000ppm; the second functional chip is color masterbatch (black masterbatch can be used) with an intrinsic viscosity of 0.43dl / g.

[0023] (2) Material supply: combined with Figure 1 White polyester chips are fed into mixing bin 4 through main material bin 1 at a feeding speed of 83 kg / h; first functional chips are fed into mixing bin 4 through distribution bin 1 2 at a feeding rate of 12.26 kg; second functional chips are fed into small screw 8 through distribution bin 2 3 at a feeding rate of 1.66 kg / h.

[0024] (3) Melt extrusion: The mixture in the mixing bin 4 is fed into the main screw 5. The parameters of the main screw are set as shown in Table 1; the parameters of the small screw 8 are set as shown in Table 2.

[0025] Table 1: Main Screw Parameter Table

[0026]

[0027] Table 2: Process Parameters for Small Screw

[0028]

[0029] (4) Spinning process:

[0030] It produces colored flame-retardant polyester industrial yarn with specifications of 1110dtex / 192f, with spinneret specifications of 0.6mm*1.2mm / 192f and 40μm sintered metal mesh filter element.

[0031] W / D: 2600m / min, tension: 100cN, grid pressure: 2.2bar.

[0032] Metering pump specifications: 20cc / r, metering pump speed: 12.55r / min.

[0033] Slow cooler temperature: 330℃.

[0034] Side-blowing air velocity: 0.55m / s, air temperature: 20℃, air humidity: 75%.

[0035] Spinning oil: GXM-100.

[0036] Oil pump specifications: 0.08cc / r, oil pump speed: 45r / min.

[0037] Roll temperature and speed are set as shown in Table 3, and the draw ratio is 4.78.

[0038] Table 3: Temperature and speed settings for each roller in the spinning winding process

[0039]

[0040] A signal feedback device for detecting phosphorus content and color difference is set before the rolling process: when the phosphorus content exceeds 6500ppm, it indicates that the amount of flame retardant masterbatch added is excessive. This signal is transmitted to the first control system 11, which increases the feeding speed of white polyester chips accordingly, which is equivalent to reducing the amount of flame retardant masterbatch supplied. Conversely, when the phosphorus content is below 4000ppm, it indicates that the amount of flame retardant masterbatch added is insufficient, so the feeding speed of white polyester chips is reduced or the supply of flame retardant masterbatch is increased. When the RGB value of the fiber exceeds the set value or the fluctuation range exceeds 10%, the amount of second functional masterbatch added is adjusted to change the amount of color masterbatch added.

[0041] When spinning 1110dtex / 192f specification fiber, the measured fineness is 1125dtex, the breaking strength is 82.12N, the breaking strength is 7.30cN / dtex, the dry heat shrinkage rate is 7.0%, the breaking elongation is 14.5%, the network is 5; the L value is 90, the B value is 4.6, the a value is -1.5, and the phosphorus content in the fiber is 6500ppm.

[0042] Example 1-1

[0043] Most common masterbatches are hydrophobic materials, which easily cause static electricity. To balance breaking strength and fuzzing, based on the principle that a higher draw ratio and more intense stretching make it easier to obtain strength, but also more likely to produce fuzzing, this embodiment selects a draw ratio of 5.35 to test the effect of the amount of masterbatch added relative to white polyester chips on spinning conditions.

[0044] After preliminary experiments, we determined that the relative addition range of color masterbatch with a more prominent influence was 2-3.5%. The following selected four addition gradients within this range and calculated the color pump speed (i.e. the metering pump speed of the small screw 8) from low to high for each experiment (other parameter settings are the same as in Example 1). The results are shown in Table 4.

[0045] Table 4: Effect of different amounts of masterbatch added on the reaction

[0046]

[0047] Table 4 shows that as the amount of color masterbatch added relative to white polyester chips increases, the severity of filament dispersion gradually intensifies, the full roll rate decreases significantly, and monofilament breakage and terry loop phenomena increase, especially above 3%, where full rolls are almost nonexistent. Below 3%, although filament dispersion still exists, the appearance indicators are normal; below 2%, the filament dispersion is not obvious. Therefore, it is appropriate to control the amount of color masterbatch added below 3%.

[0048] Examples 1-2

[0049] This embodiment has the same setup as Embodiment 1, except that: two stretching ratios of 5.35 and 5.0 are used as variables to test multiple parallel samples to determine the effect of stretching ratio on the performance of products of the same specifications, as shown in Table 5.

[0050] Table 5: Comparison of fiber performance parameters under different draw ratios

[0051]

[0052] Based on Example 1 (stretch ratio 4.78) and comparing with Table 5, it can be seen that when processing the same specifications (specification 1110 in Table 5), the larger the stretch ratio, the higher the measured fineness, the higher the strength, strength and dry heat shrinkage rate, while the elongation is lower.

[0053] Example 2

[0054] This embodiment describes the preparation of colored fluorescent polyester industrial yarn:

[0055] (1) Raw materials: White polyester chips are polyester chips with an intrinsic viscosity of 1.05 dl / g and a moisture content of 10 ppm; the first functional chip is color masterbatch (black color masterbatch can be used in this embodiment), with an intrinsic viscosity of 0.43 dl / g, and the amount added is 3% of the weight of white polyester chips; the second functional chip is fluorescent masterbatch (whitening agent PS-1 can be used in this embodiment), with an intrinsic viscosity of 0.52 dl / g, and the amount added is 2% of the weight of white polyester chips.

[0056] (2) Material supply: combined with Figure 1White polyester chips are fed into mixing bin 4 through main material bin 1, and the feeding speed of white polyester chips is 83 kg / h; first functional chips are fed into mixing bin 4 through material distribution bin 1 2, and second functional chips are fed into small screw 8 through material distribution bin 2 3.

[0057] (3) Melt extrusion: The mixture in the mixing bin 4 is fed into the main screw 5. The parameters of the main screw are set as shown in Table 6; the parameters of the small screw 8 are set as shown in Table 7, and the corresponding fluorescent masterbatch addition content is 200ppm.

[0058] Table 6: Main Screw Parameter Table

[0059]

[0060] Table 7: Process Parameters for Small Screw

[0061]

[0062] (4) Spinning process:

[0063] It is made of colored fluorescent polyester fiber with a specification of 1110dtex / 192f, with a spinneret specification of 0.6mm*1.2mm / 192f and a 40μm sintered metal mesh filter element.

[0064] The roller temperature and roller speed are set as shown in Table 8, and the stretch ratio is 5.9.

[0065] Table 8: Temperature and Speed ​​Settings for Each Roller in Spinning and Winding

[0066]

[0067] A signal feedback device for detecting whiteness and color difference is set up before the rolling process: when color difference occurs in the fiber, the signal is transmitted to the first control system 11. The first control system 11 adjusts the relative feeding speed of the white polyester chips accordingly, which changes the relative addition amount of color masterbatch. When the fiber has a brightness coefficient <0.20 and the luminescence intensity under ultraviolet light excitation is less than 3000 a.u., it indicates that the fluorescent masterbatch addition is insufficient. Adjusting the addition speed of the second functional masterbatch can make up for the deficiency. Conversely, when the whiteness is higher than the brightness coefficient ≥0.20 and the luminescence intensity under ultraviolet light excitation is greater than 3000 a.u., it indicates that the fluorescent masterbatch addition is excessive. Adjusting the addition speed of the second functional masterbatch reduces the addition speed of the fluorescent masterbatch.

[0068] The polyester fiber obtained by the above process has a breaking strength of 92.4 N, a breaking strength of 8.18 cN / dtex, a breaking elongation of 12.9%, an L value of 60.44, a B value of -4.92, and an a value of 1.74.

[0069] Example 2-1

[0070] This embodiment has the same setup as Embodiment 1, except that the amount of fluorescent masterbatch added is different, as shown in Table 9.

[0071] Table 9: Effect of different fluorescent masterbatch addition amounts on fiber properties

[0072]

[0073] As shown in Table 9, with the increase of fluorescent masterbatch addition, the changes in tensile strength and elongation at break are not obvious, basically remaining around 93-94 N for tensile strength, 8.1-8.3 cN / dtex for tensile strength, and 12.7-12.9% for elongation at break. However, the L value of color decreases significantly, and the fiber darkens; the B value decreases, and the fluorescent agent plays a whitening role. Considering all factors, it is appropriate to control the addition of fluorescent masterbatch at 60-200 ppm for dark colors and at 200-300 ppm for light colors.

[0074] Example 2-2

[0075] This embodiment has the same settings as Embodiment 1, except that the stretching ratio is different, as shown in Table 10.

[0076] Table 10: Effect of different draw ratios on fiber properties

[0077]

[0078] Table 10 shows that spinning is good when the draw ratio is between 5.4 and 5.9. With increasing draw ratio, the breaking strength and tensile strength gradually increase, while the elongation at break gradually decreases. However, when the draw ratio exceeds 6.0, while the breaking strength and tensile strength continue to increase, sporadic filament breakage occurs. When the draw ratio exceeds 6.2, continuous filament breakage occurs. Based on the spinning requirements, the draw ratio should be controlled between 5.4 and 6.0.

[0079] Examples 1 and 2 above confirm that the draw ratio has the same influence trend on different multifunctional polyester fibers: the breaking strength and breaking power increase with the increase of the draw ratio, while the breaking elongation decreases with the increase of the draw ratio.

[0080] Example 3

[0081] This embodiment prepares antistatic fluorescent functional polyester fibers, as detailed below:

[0082] (1) Raw materials: White polyester chips are polyester chips with an intrinsic viscosity of 1.05 dl / g and a moisture content of 10 ppm; the first functional chip is antistatic masterbatch (antistatic agent with polyether ester as carrier), with an intrinsic viscosity of 0.63 dl / g and a moisture content of 10 ppm, and the addition amount is 10% of the mass of white polyester chips; the second functional chip is fluorescent masterbatch (in this embodiment, whitening agent PS-1 can be used), with an intrinsic viscosity of 0.50 dl / g, and the addition amount relative to white polyester chips is 200 ppm.

[0083] (2) Material supply: combined with Figure 1 White polyester chips are fed into mixing bin 4 through main material bin 1, and the feeding speed of white polyester chips is 83 kg / h; first functional chips are fed into mixing bin 4 through material distribution bin 1 2, and second functional chips are fed into small screw 8 through material distribution bin 2 3.

[0084] (3) Melt extrusion: The mixture in the mixing bin 4 is fed into the main screw 5. The parameters of the main screw 5 are set to 266℃ / 285℃ / 275℃ / 268℃ / 260℃ / 265℃, 155 bar; the parameters of the small screw are set to 256℃ / 276℃ / 251℃ / 240℃ / 235℃, 75 bar, output 45%, metering pump speed 12.6 rpm, and drying temperature 132℃.

[0085] (4) Spinning:

[0086] It is made of antistatic fluorescent polyester fiber with a specification of 1110dtex / 192f, with a spinneret specification of 0.6mm*1.2mm / 192f and a 40μm sintered metal mesh filter element.

[0087] GR-1+2: 442 m / min;

[0088] GR-3+4: 488 m / min, 91℃;

[0089] GR-5+6: 1750m / min, 133℃;

[0090] GR-7+8: 2461m / min, 232℃;

[0091] GR-9+10: 2386m / min, 132℃;

[0092] The stretch ratio is 5.4.

[0093] Before the rolling process, a signal feedback device is set up to detect changes in volume resistivity (YG321 fiber resistivity meter, tested by Changzhou Textile Instrument Factory) and color difference (or whiteness): to control the addition speed and amount of the first functional masterbatch (mainly controlling white polyester chips) and the second functional masterbatch.

[0094] The resulting finished fiber has a breaking strength of 93.6 N, a breaking strength of 8.43 cN / dtex, a breaking elongation of 12.6%, and a volume resistivity of 5.8 × 10⁻⁶. 10 Ω·cm, dust absorption height <0.5cm.

[0095] Example 3-1:

[0096] This embodiment has the same setup as Embodiment 3, except that the amount of antistatic masterbatch added (relative to the mass ratio of white polyester chips) is different, in order to verify the effect of antistatic masterbatch on fiber properties, as shown in Table 11.

[0097] Table 11: Effect of different antistatic masterbatches on the relative proportion of white polyester chips

[0098]

[0099]

[0100] As shown in Table 11, the antistatic masterbatch has little effect on the mechanical properties of the fiber. The bulk resistivity and dust absorption height of the fiber decrease with increasing antistatic masterbatch content. When the antistatic masterbatch content is greater than 10%, the fiber bulk resistivity reaches 10. 10 The Ω·cm (T=20℃, RH=65%) indicates that it is almost non-dust-absorbing (T=25℃, RH=40%). Therefore, the appropriate amount of antistatic masterbatch added should be controlled at 10-14% of the mass of white polyester chips.

[0101] Example 4

[0102] This embodiment describes the preparation of UV-resistant and antibacterial polyester fibers, as detailed below:

[0103] (1) Raw materials: White polyester chips are polyester chips with an intrinsic viscosity of 1.05 dl / g and a moisture content of 10 ppm; the first functional chip is UV-resistant masterbatch (nano TiO2) with an intrinsic viscosity of 0.48 dl / g and a moisture content of 20 ppm, and the addition amount is 200 ppm of the mass of white polyester chips; the second functional chip is antibacterial masterbatch (nano silver-based antibacterial agent can be used in this embodiment) with an intrinsic viscosity of 0.52 dl / g, and the addition amount relative to white polyester chips is 100 ppm.

[0104] (2) Material supply: combined with Figure 1 White polyester chips are fed into mixing bin 4 through main material bin 1, and the feeding speed of white polyester chips is 83 kg / h; first functional chips are fed into mixing bin 4 through material distribution bin 1 2, and second functional chips are fed into small screw 8 through material distribution bin 2 3.

[0105] (3) Melt extrusion: The mixture in the mixing bin 4 is fed into the main screw 5. The parameters of the main screw 5 are set to 296℃ / 305℃ / 298℃ / 290℃ / 285℃ / 282℃, 190 bar; the parameters of the small screw are set to 288℃ / 293℃ / 290℃ / 289℃ / 273℃, 65 bar, output 55%, metering pump speed 13.3 rpm, and drying temperature 156℃.

[0106] (4) Spinning:

[0107] It is made of antistatic fluorescent polyester fiber with a specification of 1110dtex / 192f, with a spinneret specification of 0.6mm*1.2mm / 192f and a 40μm sintered metal mesh filter element.

[0108] GR-1+2: 460 m / min;

[0109] GR-3+4: 495 m / min, 93℃;

[0110] GR-5+6: 1850m / min, 143℃;

[0111] GR-7+8: 2721m / min, 242℃;

[0112] GR-9+10: 2688m / min, 129℃;

[0113] The draw ratio is 5.84.

[0114] Before the rolling process, a signal feedback device is set up to detect the aging strength retention rate and silver ion content (inductively coupled plasma optical emission spectrometry, ICP-OES) to control the addition rate and amount of the first functional masterbatch (mainly controlling white polyester chips) and the second functional masterbatch.

[0115] The resulting finished fiber has a breaking strength of 84.4 N, a breaking strength of 7.6 cN / dtex, a dry heat shrinkage rate of 6.0%, and a breaking elongation of 15.9%. The accelerated aging test under artificial fluorescent ultraviolet lamp for 300 hours showed that it has strong UV resistance and a breaking strength retention rate of over 90%. The bacterial activity value is <-1.0 (JISL-1902-1998), and there is no fungal growth (JISZ-2911).

[0116] Comparative Example 1

[0117] This comparative example demonstrates the preparation of multifunctional polyester fibers using a melt mixing method. The same white polyester chips, flame retardant masterbatch, and color masterbatch as in Example 1 were used for melt mixing. All three components were prepared into a melt state. The melts of the flame retardant masterbatch and color masterbatch were then added to the melt of the white polyester chips and mixed before spinning. We found that the pressure difference before and after the metering pump was large and fluctuated significantly, resulting in poor spinning stability, significant fiber breakage, and difficulty in achieving stable spinning.

[0118] Comparative Example 2

[0119] This comparative example demonstrates the preparation of multifunctional polyester fibers using a masterbatch mixing method. The same white polyester chips, flame-retardant masterbatch, and color masterbatch as in Example 1 were used for chip mixing. After mixing the flame-retardant and color masterbatches with the white polyester chips, the mixture was extruded and melt-spun. We found that the color masterbatch and flame-retardant masterbatch have significantly different thermal properties, leading to uneven melting and insufficient melting during extrusion, resulting in severe filter clogging and difficulty in fiber formation.

Claims

1. A method for preparing an antistatic fluorescent multifunctional polyester fiber, characterized in that: (1) Raw materials: White polyester chips are polyester chips with an intrinsic viscosity of 1.05 dl / g and a moisture content of 10 ppm; the first functional chip is an antistatic masterbatch with polyether ester as a carrier, with an intrinsic viscosity of 0.63 dl / g and a moisture content of 10 ppm, and the addition amount is 10% of the mass of white polyester chips; the second functional chip is whitening agent PS-1, with an intrinsic viscosity of 0.50 dl / g, and the addition amount relative to white polyester chips is 200 ppm. (2) Feeding: White polyester chips are fed into the mixing silo through the main material silo, and the feeding speed of white polyester chips is 83 kg / h; the first functional chips are fed into the mixing silo through the first material distribution silo, and the second functional chips are fed into the small screw through the second material distribution silo. (3) Melt extrusion: The mixture in the mixing bin is fed into the main screw. The parameters of the main screw are set as follows: Zone 1 temperature is 266 ℃, Zone 2 temperature is 285 ℃, Zone 3 temperature is 275 ℃, Zone 4 temperature is 268 ℃, Zone 5 temperature is 260 ℃, Zone 6 temperature is 265 ℃, and 155 bar. The small screw parameters are set as follows: Zone 1 temperature 256 ℃, Zone 2 temperature 276 ℃, Zone 3 temperature 251 ℃, Zone 4 temperature 240 ℃, Zone 5 temperature 235 ℃, 75 bar, output 45%, metering pump speed 12.6 rpm, drying temperature 132 ℃. (4) Spinning process: Antistatic fluorescent polyester fiber with a specification of 1110 dtex / 192 f is spun, with a spinneret specification of 0.6 mm*1.2 mm / 192 f, and a 40 μm sintered metal mesh filter element. The roller speed of GR-1+2 is 442 m / min; The GR-3+4 has a roller speed of 488 m / min and a roller temperature of 91 ℃; The GR-5+6 has a roller speed of 1750 m / min and a roller temperature of 133 ℃; The GR-7+8 has a roller speed of 2461 m / min and a roller temperature of 232 ℃; The GR-9+10 has a roll speed of 2386 m / min and a roll temperature of 132 ℃. The draw ratio is 5.

4. A signal feedback device is installed before the rolling process to detect changes in volume resistivity and color difference, thereby controlling the addition speed and amount of the first and second functional slices. The obtained antistatic fluorescent polyester fiber has a breaking strength of 93.6 N, a breaking strength of 8.43 cN / dtex, a breaking elongation of 12.6%, and a volume resistivity of 5.8 × 10⁻⁶. 10 Ω·cm, dust absorption height <0.5cm.

Images