Preparation method of antistatic fluorescent multifunctional polyester fiber

Abstract

The invention provides a preparation method of an antistatic fluorescent multifunctional polyester fiber, and belongs to the technical field of melt spinning. White polyester chips are fed into a mixing bin through a main bin, first functional chips are fed into the mixing bin through a first distribution bin, second functional chips are fed into a small screw through a second distribution bin, melt extrusion and spinning processes are carried out, the first functional chips are antistatic master batches with polyether ester as a carrier, and the second functional chips are whitening agents PS-1. A signal feedback device for detecting volume specific resistance change and color difference is arranged before the packaging process, the adding speed and the adding amount of the first functional slice and the second functional slice are controlled, and the breaking strength of the obtained antistatic fluorescent polyester fiber is 93.6 N, the breaking strength is 8.43 cN / dtex, the elongation at break is 12.6%, the volume specific resistance is 5.8 * 10 < 10 > omega.cm, and the dust absorption height is smaller than 0.5 cm.

Description

Technical Field

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

[0002] Currently, functional fibers are typically spun by extruding white polyester chips into a melt, then injecting the functional components through a small screw (as in CN102787376A). Alternatively, as in CN214612856U, white polyester chips are first mixed with the functional components and then melt-extruded for spinning. Both methods suffer from a single method and a limited number of functionalities. Furthermore, some masterbatches have poor heat and pressure resistance, making it difficult to achieve optimal results with a single method. For example, in color and fluorescent masterbatches, the added color pigments and fluorescent components are mostly organic, which generally have poor heat resistance. Summary of the Invention

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

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

[0005] A preparation process for 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 a main material bin, and first functional chips are supplied to a sub-bin. The two are mixed in a mixing bin and then fed into a 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, mixed with the extruded melt of the main screw, and fed into a spinning process. Control systems are provided between the mixing bin and the main material bin, between the mixing bin and sub-bin, and between the small screw and the main screw, for online monitoring of the extruded melts of the supplied white polyester chips, first functional chips, and second functional chips.

[0006] The above-mentioned process of this application is mainly based on 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, the processing of polyester fibers with different effects can be achieved; in the above-mentioned 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 first mixed and then dissolved, which can well control the product quality. When the melt of the second functional chips with a relatively small amount of addition is added, the addition of the second component can be realized. Due to the above-mentioned special settings of its addition amount and addition state, its addition will not cause melt pressure fluctuations, thereby realizing flexible production and processing of multiple functions.

[0007] Furthermore, as a preference:

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

[0009] The small screw is a single screw or a twin screw.

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

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

[0012] A signal feedback device is provided in the spinning process, and the signal feedback device is connected to each control system. Based on the fiber condition, before the fiber package is formed, the signal feedback device monitors the functional indicators online, such as: the flame retardant component can obtain the phosphorus content by monitoring the P element content, the antistatic component can monitor the resistance change to obtain the resistance signal, the antibacterial component can obtain the silver content by monitoring the silver element content, the ultraviolet resistance detects the spectral transmittance change, and the color difference signal of the colored and fluorescent components can be obtained by online colorimetry to adjust the corresponding feed amount and feed speed.

[0013] Several specific multifunctional polyester fibers are added below.

[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, a moisture content of ≤40 ppm, and a feeding speed of 1.5-15 tons / h; the first functional chips are masterbatch with a moisture content of ≤40 ppm, and an addition amount of 2-5% of the mass of the white polyester chips; the screw extrusion temperature is 270-290°C; the second functional chips are 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°C, the addition amount of the fluorescent masterbatch relative to the white polyester chips is 60-250 ppm, and the stretching 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 chips are flame-retardant masterbatch with a moisture content of ≤40 ppm, an intrinsic viscosity of 0.85-1.25 dl / g, a P element content of 5000-100000 ppm, and a feeding speed of 5kg-3000kg / h; the screw extrusion temperature is 230-320℃; the second functional slice is a masterbatch with an intrinsic viscosity of 0.3-0.7dl / 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 of the spinning process to control the addition speed and addition amount of the first functional masterbatch and the second functional masterbatch.

[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 chips are 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° C.; the second functional chips are 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° C., 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 provided before the winding process of the spinning process to control the addition speed and addition amount of the first functional masterbatch and the second functional masterbatch.

[0017] The multifunctional polyester fiber is an anti-ultraviolet and antibacterial 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 chips are anti-ultraviolet 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°C; the second functional chips are 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°C, 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 spectral transmittance changes and silver content is provided before the winding process of the spinning process to control the addition speed and addition amount of the first and second functional masterbatch. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Numbers in the figure: 1. Main silo; 11. First control system; 2. Distribution silo 1; 3. Distribution silo 2; 4. Mixing silo; 5. Main screw; 6. Drying mechanism 1; 61. Second control system; 7. Drying mechanism 2; 8. Small screw; 81. Third control system. DETAILED DESCRIPTION

[0020] Example 1

[0021] This example is about preparing 1000D colored flame-retardant functional polyester fiber.

[0022] (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 chips are flame retardant masterbatch (phosphorus flame retardant), with an intrinsic viscosity of 0.95 dl / g and a P element content of 44,000 ppm; the second functional chips are color masterbatch (black masterbatch can be used), with an intrinsic viscosity of 0.43 dl / g.

[0023] (2) Feeding: Combined Figure 1 The white polyester chips are fed into the mixing bin 4 through the main silo 1, and the feeding speed of the white polyester chips is 83kg / h; the first functional chips are fed into the mixing bin 4 through the sub-bin 1 2, and the feeding amount is 12.26kg; the second functional chips are fed into the small screw 8 through the sub-bin 2 3, and the adding speed is 1.66kg / h.

[0024] (3) Melt extrusion: The mixed material 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 parameters

[0026]

[0027] Table 2: Process parameters of small screw

[0028]

[0029] (4) Spinning process:

[0030] Spinning 1110dtex / 192f colored flame-retardant polyester industrial yarn, spinneret specification 0.6mm*1.2mm / 192f, 40μm sintered metal mesh filter element.

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

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

[0033] Slow cooler temperature: 330℃.

[0034] Side wind speed: 0.55m / s, wind temperature: 20℃, humidity: 75%.

[0035] Spinning oil: GXM-100.

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

[0037] The roller temperature and roller speed were set as shown in Table 3, and the draft ratio was 4.78.

[0038] Table 3: Temperature and speed settings of each spin winding roller

[0039]

[0040] A signal feedback device for detecting phosphorus content and color difference is set before the winding process: when the phosphorus content exceeds 6500ppm, it indicates that the amount of flame retardant masterbatch added exceeds the standard, and the signal is transmitted to the first control system 11. The first control system 11 increases the feeding speed of the white polyester chips accordingly, which is equivalent to reducing the feeding amount of the flame retardant masterbatch. Conversely, when the phosphorus content is lower than 4000ppm, it indicates that the amount of flame retardant masterbatch added is insufficient, so the feeding speed of the 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 addition amount of the second functional masterbatch is adjusted and the addition amount of the color masterbatch is changed.

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

[0042] Example 1-1

[0043] Common masterbatches are often hydrophobic and prone to static electricity. To balance breaking strength and linting, a draw ratio of 5.35 was selected in this example to test the effect of adding masterbatch relative to white polyester chips on spinning performance, based on the principle that higher draw ratios and more intense stretching increase strength but also increase the likelihood of linting.

[0044] After preliminary experiments, we determined that the relative addition range of a masterbatch with a more prominent influence is 2-3.5%. The following four addition gradients within this range were selected, and the color pump speed (i.e., the metering pump speed of the small screw 8) was calculated 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 masterbatch addition amounts on the reaction

[0046]

[0047] Table 4 shows that as the amount of masterbatch added relative to the white polyester chips increases, the severity of the tow divergence phenomenon gradually intensifies, the full coil rate decreases significantly, and single filament breakage and terry yarns increase. Especially above 3%, full coils are almost nonexistent. Below 3%, although tow divergence still occurs, the appearance indicators are normal. Below 2%, tow divergence is not obvious. Therefore, it is appropriate to control the masterbatch addition level below 3%.

[0048] Example 1-2

[0049] The configuration of this embodiment is the same as that of embodiment 1, except that: two stretch ratios of 5.35 and 5.0 are used as variables, and multiple parallel samples are tested to determine the effect of the stretch 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 stretching ratios

[0051]

[0052] Combined with Example 1 (stretching ratio 4.78), and compared with Table 5, it can be seen that when processing with the same specifications (the specifications in Table 5 are 1110), the larger the stretching ratio, the higher the measured fineness is generally, the strength, intensity and dry heat shrinkage are generally higher, and the elongation is lower.

[0053] Example 2

[0054] This example is used to prepare 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 chips are masterbatch (black masterbatch can be used in this embodiment), with an intrinsic viscosity of 0.43 dl / g, and the addition amount is 3% of the weight of the white polyester chips; the second functional chips are fluorescent masterbatch (whitening agent PS-1 can be used in this embodiment), with an intrinsic viscosity of 0.52 dl / g, and the addition amount is 2% of the weight of the white polyester chips.

[0056] (2) Feeding: Combined Figure 1The white polyester chips are fed into the mixing bin 4 through the main silo 1, and the feeding speed of the white polyester chips is 83 kg / h; the first functional chips are fed into the mixing bin 4 through the sub-bin 1 2, and the second functional chips are fed into the small screw 8 through the sub-bin 2 3.

[0057] (3) Melt extrusion: The mixed material 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. The corresponding fluorescent masterbatch addition content is 200 ppm.

[0058] Table 6: Main screw parameters

[0059]

[0060] Table 7: Process parameters of small screw

[0061]

[0062] (4) Spinning process:

[0063] Spinning colored fluorescent polyester fiber with specifications of 1110dtex / 192f, spinneret specifications of 0.6mm*1.2mm / 192f, 40μm sintered metal mesh filter element.

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

[0065] Table 8: Temperature and speed settings of each spin winding roller

[0066]

[0067] A signal feedback device for detecting whiteness and color difference is set before the winding process: when color difference occurs in the fiber, the signal is transmitted to the first control system 11, and the first control system 11 adjusts the relative feeding speed of the white polyester chips accordingly, that is, changes the relative addition amount of the masterbatch; when the brightness coefficient of the fiber is less than 0.20 and the luminous intensity is less than 3000 a.u. under ultraviolet light excitation, it indicates that the fluorescent masterbatch is insufficiently added, and 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 luminous intensity is greater than 3000 a.u. under ultraviolet light excitation, it indicates that the fluorescent masterbatch is excessively added, and the addition speed of the second functional masterbatch is adjusted to reduce the addition speed of the fluorescent masterbatch.

[0068] The polyester fiber obtained by the above process has a breaking strength of 92.4N, a breaking tenacity of 8.18cN / dtex, an elongation at break 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] The configuration of this embodiment is the same as that of embodiment 1, except that the amount of fluorescent masterbatch added is different, as shown in Table 9.

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

[0072]

[0073] As can be seen from Table 9, with the increase of the amount of fluorescent masterbatch added, the change pattern of breaking strength and breaking elongation is not obvious, basically maintaining the breaking strength around 93-94N, the breaking strength at 8.1-8.3cN / dtex, and the breaking elongation at 12.7-12.9%. However, the chromaticity L value decreases significantly, and the fiber becomes darker; the B value decreases, and the fluorescent agent plays a whitening role. Taking all factors into consideration: for dark colors, it is appropriate to control the amount of fluorescent masterbatch added to 60-200ppm, and for light colors, it is appropriate to control the amount of fluorescent masterbatch added to 200-300ppm.

[0074] Example 2-2

[0075] The configuration of this embodiment is the same as that of embodiment 1, except that the stretching ratio is different, as shown in Table 10.

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

[0077]

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

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

[0080] Example 3

[0081] This example prepares antistatic fluorescent functional polyester fibers as follows:

[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 chips are antistatic masterbatch (an antistatic agent 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 the white polyester chips; the second functional chips are fluorescent masterbatch (whitening agent PS-1 can be used in this embodiment), with an intrinsic viscosity of 0.50 dl / g, and the addition amount relative to the white polyester chips is 200 ppm.

[0083] (2) Feeding: Combined Figure 1 The white polyester chips are fed into the mixing bin 4 through the main silo 1, and the feeding speed of the white polyester chips is 83 kg / h; the first functional chips are fed into the mixing bin 4 through the sub-bin 1 2, and the second functional chips are fed into the small screw 8 through the sub-bin 2 3.

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

[0085] (4) Spinning:

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

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

[0088] GR-3+4: 488m / 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 was 5.4.

[0093] Before the winding process, a signal feedback device is set to detect the change of 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 for controlling white polyester chips) and the second functional masterbatch.

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

[0095] Example 3-1:

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

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

[0098]

[0099]

[0100] It can be seen from Table 11 that the antistatic masterbatch has little effect on the mechanical properties of the fiber. The volume resistivity and dust absorption height of the fiber decrease with the increase of the addition amount of the antistatic masterbatch. When the addition ratio of the antistatic masterbatch is greater than 10%, the volume resistivity of the fiber reaches 10 10 Ω·cm (T=20℃, RH=65%), and almost no dust absorption (T=25℃, RH=40%). Therefore, it is appropriate to control the addition amount of antistatic masterbatch to 10-14% of the mass of white polyester chips.

[0101] Example 4

[0102] This embodiment prepares anti-ultraviolet and antibacterial functional polyester fibers as follows:

[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 chips are anti-UV 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 based on the mass of the white polyester chips; the second functional chips are antibacterial masterbatch (nano-silver antibacterial agent can be used in this embodiment), with an intrinsic viscosity of 0.52 dl / g, and the addition amount relative to the white polyester chips is 100 ppm.

[0104] (2) Feeding: Combined Figure 1 The white polyester chips are fed into the mixing bin 4 through the main silo 1, and the feeding speed of the white polyester chips is 83 kg / h; the first functional chips are fed into the mixing bin 4 through the sub-bin 1 2, and the second functional chips are fed into the small screw 8 through the sub-bin 2 3.

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

[0106] (4) Spinning:

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

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

[0109] GR-3+4: 495m / 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 stretch ratio was 5.84.

[0114] Before the winding 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 speed and amount of the first functional masterbatch (mainly for controlling white polyester chips) and the second functional masterbatch.

[0115] The finished fiber has a breaking strength of 84.4N, a breaking tenacity of 7.6cN / dtex, a dry heat shrinkage of 6.0%, and an elongation at break of 15.9%. A 300-hour accelerated aging test using artificial fluorescent UV light showed that the fiber 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] In this comparative example, multifunctional polyester fibers were prepared by melt mixing. The same white polyester chips, flame retardant masterbatch, and color masterbatch as in Example 1 were used for melt mixing. The three components were all melted, and then the melts of the flame retardant masterbatch and the color masterbatch were added to the melt of the white polyester chips. The mixture was then spun. 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 stable spinning.

[0118] Comparative Example 2

[0119] In this comparative example, multifunctional polyester fibers were prepared by masterbatch mixing. The same white polyester chips, flame retardant masterbatch and color masterbatch as in Example 1 were used for production by chip mixing. The flame retardant masterbatch and color masterbatch were mixed with the white polyester chips and extruded and melt-spun. We found that the thermal properties of the color masterbatch and the flame retardant masterbatch were quite different, and uneven and insufficient melting were easily caused during extrusion melting, resulting in serious clogging of the filter element and difficulty in fiber forming.

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 chips are antistatic masterbatches with polyether ester as the 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 the white polyester chips; the second functional chips are whitening agent PS-1 with an intrinsic viscosity of 0.50 dl / g and an addition amount relative to the white polyester chips of 200 ppm. (2) Feeding: White polyester chips are fed into the mixing bin through the main bin, and the feeding speed of white polyester chips is 83 kg / h; the first functional chips are fed into the mixing bin through the sub-bin 1, and the second functional chips are fed into the small screw through the sub-bin 2. (3) Melt extrusion: The mixed material 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 °C, zone 2 temperature is 285 °C, zone 3 temperature is 275 °C, zone 4 temperature is 268 °C, zone 5 temperature is 260 °C, zone 6 temperature is 265 °C, 155 bar; The small screw parameters are set as follows: zone 1 temperature is 256 °C, zone 2 temperature is 276 °C, zone 3 temperature is 251 °C, zone 4 temperature is 240 °C, zone 5 temperature is 235 °C, 75 bar, output 45%, metering pump speed is 12.6 rpm, drying temperature is 132 °C, (4) Spinning process: Spinning antistatic fluorescent polyester fiber with specifications of 1110 dtex / 192 f, spinneret specifications of 0.6 mm*1.2 mm / 192 f, 40 μm sintered metal mesh filter element, The roller speed of GR-1+2 is 442 m / min; The roller speed of GR-3+4 is 488 m / min and the roller temperature is 91 °C; The roller speed of GR-5+6 is 1750 m / min and the roller temperature is 133 °C; The roller speed of GR-7+8 is 2461 m / min and the roller temperature is 232 °C; The roller speed of GR-9+10 is 2386 m / min, and the roller temperature is 132 ℃. The stretching ratio is 5.4, Before the packaging process, a signal feedback device for detecting volume specific resistance changes and color differences is set to control the adding speed and amount of the first functional slice and the second functional slice. The obtained antistatic fluorescent polyester fiber has a breaking strength of 93.6 N, a breaking tenacity of 8.43 cN / dtex, a breaking elongation of 12.6%, and a volume resistivity of 5.8×10 10 Ω·cm, ash absorption height <0.5cm.

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