Antistatic composite monofilament and preparation method therefor

Abstract

The present invention relates to the technical field of composite monofilaments, and in particular to an antistatic composite monofilament, comprising a core monofilament and a sheath layer, wherein the sheath layer wraps the core monofilament; the core monofilament is prepared by drying PPS chips mixed with modified lignin fibers, and subjecting same to screw-extrusion melting, spinning, drawing and heat-setting, followed by microwave treatment; and the sheath layer is prepared by drying HDPE chips mixed with a modified conductive oxide and subjecting same to screw-extrusion melting. In the composite monofilament provided by the present invention, the core monofilament is taken as a main conductive region and the sheath layer is taken as an auxiliary conductive region, and the core monofilament and a sheath monofilament are electrically conductive with each other, which can effectively avoid accumulation of static electricity. In the preparation of the core monofilament, during microwave treatment, moisture of dilute sulfuric acid in the modified lignin fibers can be evaporated, so that the sulfuric acid becomes more concentrated, to carbonize the lignin fibers to form fibrous conductive carbon, thereby effectively improving the conductive effect of the core monofilament.

Description

An antistatic composite monofilament and its preparation method Technical Field

[0001] This invention relates to the field of composite monofilament technology, and in particular to an antistatic composite monofilament and its preparation method. Background Technology

[0002] Composite monofilament, as a type of composite fiber material, has advantages such as smooth surface, bright colors, waterproof, oil-proof, UV-proof, flame-retardant, cool, wear-resistant, and long service life. Therefore, it is widely used in various products such as outdoor leisure products, clothing, furniture decoration, beach chairs, hammocks, curtains, car seat cushions and floor mats, door mats, and decorative products.

[0003] The main raw materials for preparing composite monofilaments include high molecular weight polymers such as PET (polyethylene terephthalate), PPS (polyphenylene sulfide), PE (polyethylene), HDPE (high-density polyethylene), and LDPE (low-density polyethylene). Because these polymers are inherently hydrophobic with low moisture content, they are prone to static electricity. Therefore, clothing made from composite monofilaments easily accumulates static electricity, leading to unpleasant wearing experiences and, in certain environments, posing safety hazards such as fire hazards. Thus, considering both comfort and safety, the necessity of antistatic processing is becoming increasingly apparent.

[0004] There are many antistatic fibers on the market, and antistatic fabrics are usually achieved in three ways: one is by using a finishing method to attach antistatic agents to the fabric surface, but the durability of antistatic properties is poor, affecting its application effect; another is by adding conductive fibers, such as metal fibers, carbon fibers, or silver-plated fibers, to the fabric in a certain way and proportion, which has excellent antistatic properties, but the fabric has a poor hand feel or high cost, and when the amount added is large, it will lead to a decrease in the strength of the fabric, which greatly limits its application in clothing fabrics; the third is to add carbon black or graphite during the spinning process to obtain antistatic fibers. Antistatic fibers obtained in this way have a certain color, and the color of fabrics using this type of fiber will be limited, and dyeing them in light colors will affect the appearance of the fabric.

[0005] Therefore, we propose an antistatic composite monofilament and its preparation method to solve the above problems. Technical issues

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing an antistatic composite monofilament and its preparation method. Technical solutions

[0007] An antistatic composite monofilament includes a core monofilament and a sheath layer; the sheath layer encapsulates the core monofilament.

[0008] PPS chips mixed with modified lignin fibers are dried, screw melted, spun, stretched and shaped, and microwave treated to produce core layer monofilaments.

[0009] HDPE chips mixed with modified conductive oxides are dried and then melted by a screw to form a skin layer;

[0010] The modified lignin fiber content in the PPS chips is 8% to 22%.

[0011] The amount of modified conductive oxide added to the HDPE chips is 2% to 6%.

[0012] Preferably, the method for preparing the modified lignin fiber includes the following steps: immersing the lignin fiber in dilute sulfuric acid, filtering it after immersion, drying the filter cake to a moisture content of 5% to 25% at a drying temperature of 60°C to 90°C, and then thoroughly mixing the dried filter cake, coupling agent, and nano-calcium carbonate for 1 to 2 hours to obtain the modified lignin fiber.

[0013] The concentration of the solute in the dilute sulfuric acid is 0.01 mol / L to 0.5 mol / L, and the mass ratio of lignin fiber, nano-calcium carbonate and coupling agent is 1:(0.01 to 0.25):(0.3 to 0.6).

[0014] Preferably, the modified conductive oxide is obtained by mixing a conductive oxide, sodium dodecylbenzenesulfonate, and a coupling agent;

[0015] The mass ratio of the conductive oxide, sodium dodecylbenzenesulfonate, and coupling agent is 1:(0.1-0.15):(0.1-0.3).

[0016] Preferably, the particle size of the nano-calcium carbonate in the modified lignin fiber is 20nm-100nm.

[0017] Preferably, the conductive oxide is at least one of conductive zinc oxide and conductive titanium oxide; the coupling agent is one of silane coupling agent or phthalate coupling agent.

[0018] Preferably, a method for preparing an antistatic composite monofilament includes the following steps:

[0019] Step 1: PPS chips mixed with modified lignin fibers are dried, melted by screw, spun, stretched and shaped, and microwave-treated to produce core layer monofilaments.

[0020] Step 2: HDPE chips mixed with modified conductive oxides are dried and melted by a screw to form a skin layer;

[0021] Step 3: Composite the core monofilament and the sheath layer prepared in Step 1 and Step 2, spin them, then cool them in a water bath, and finally wind them into an antistatic composite monofilament.

[0022] Preferably, in step 1, during the drying process, the pre-crystallization is carried out at 60℃~110℃ for 1h~2h, and the temperature is raised to 110℃~135℃ for 1h~2h. After reaching the preset temperature, the temperature is maintained for 3h~6h.

[0023] When the screw is melting, the extruder's pump feed rate is 300–500 g / min, and the pressure is 60–150 kg / cm². 2 The preheating zone temperature is 270℃~300℃, the melting zone temperature is 285℃~320℃, and the metering zone temperature is 295℃~320℃; during spinning, the template temperature is 285℃~320℃, and the spinning speed is 50℃~300m / min; during stretching and setting, the stretching ratio is 4~5.5, and the setting temperature is 150℃~210℃.

[0024] During microwave processing: the power of the microwave device is 400W to 1000W, and the residence time of the core monofilament in the microwave device is 3s to 8s.

[0025] Preferably, in step 2, during the drying process, the pre-crystallization is carried out at 45℃~80℃ for 1h~2h, and the temperature is raised to 90℃~120℃ for 1h~2h. After reaching the preset temperature, the temperature is maintained for 3h~5h.

[0026] When the screw is melting, the extruder feed rate is 300-550 g / min, and the pressure is 50 kg / cm². 2 ~150kg / cm 2 Preheating zone temperature: 235℃~275℃, melting zone temperature: 245℃~285℃, metering zone temperature: 255℃~285℃.

[0027] Preferably, in step 3, when the core layer monofilament and the sheath layer are compounded, the extruder pump feed rate is 100g / min~150g / min, the main machine temperature is 160℃~250℃, the die head temperature is 160℃~250℃, and the screw pressure is 150kg / cm². 2 ~300kg / cm 2 . Beneficial effects

[0028] 1. The composite monofilament proposed in this invention uses the core monofilament as the main conductive area and the sheath as the auxiliary conductive area. The core and sheath monofilaments are interconnected, which can effectively prevent the accumulation of static electricity. During the preparation of the core monofilament, microwave treatment can evaporate the water in the dilute sulfuric acid in the modified lignin fiber, making the sulfuric acid more concentrated and carbonizing the lignin fiber to form fibrous conductive carbon, which effectively improves the conductivity of the core monofilament. On the other hand, by adding a small amount of conductive oxide to the sheath, the conductivity of the sheath can be improved, so that the core and sheath monofilaments are interconnected and form a complete conductor, which facilitates the release of static electricity. Furthermore, high-density polyethylene itself is white, and the conductive oxide is also white. Therefore, the sheath can play a certain role in shielding the core monofilament, making it easier to dye the composite monofilament to the desired color.

[0029] 2. The composite monofilament proposed in this invention, during the preparation of the core layer monofilament, evaporates the water from the dilute sulfuric acid in the modified lignin fiber during microwave treatment. When the water vapor escapes, it leaves many micropores on the core layer monofilament. When the core layer monofilament is combined with the skin layer, some of the raw materials of the skin layer will fill the micropores, effectively improving the bonding strength between the core layer monofilament and the skin layer.

[0030] 3. In the composite monofilament proposed in this invention, during the preparation of the core layer monofilament, microwave treatment is used to break the coupling agent between the lignin fiber and the nano-calcium carbonate through water vapor. Sulfuric acid is adsorbed in the carbonized lignin fiber. At this time, the nano-calcium carbonate reacts with the sulfuric acid, and the generated calcium sulfate "grows" on the carbonized lignin fiber. The strength of the carbonized lignin fiber is improved by calcium sulfate, thereby improving the strength of the core layer monofilament. Attached Figure Description

[0031] Type the accompanying description paragraph here. The best embodiment of the present invention

[0032] In the following embodiments, unless otherwise specified, the experimental methods or testing methods are all conventional methods; the reagents and materials, unless otherwise specified, are all obtained from conventional commercial sources or prepared by conventional methods, wherein: the conductive titanium dioxide is needle-shaped conductive titanium dioxide TIPAQUEFT-3000, purchased from Qianhai Jishengya Technology Co., Ltd.; the conductive zinc oxide is Japanese Hakusui Chemicals 23-K conductive zinc oxide, purchased from Fushixin (Xiamen) Materials Technology Co., Ltd.; the silane coupling agent is one of KH550, KH560, and KH570, and the silane coupling agent and phthalate coupling agent are purchased from Shanghai Yiyan Biotechnology Co., Ltd.; and the nano calcium carbonate is purchased from Changxing Dewei New Materials Technology Co., Ltd. Embodiments of the present invention

[0033] An antistatic composite monofilament includes a core monofilament and a sheath; the sheath wraps around the core monofilament.

[0034] PPS chips mixed with modified lignin fibers are dried, screw melted, spun, stretched and shaped, and microwave treated to produce core layer monofilaments.

[0035] HDPE chips mixed with modified conductive oxides are dried and then melted by a screw to form a skin layer; Example

[0036] The amount of modified lignin fiber added to PPS chips is 8%.

[0037] The amount of modified conductive oxide added to the HDPE chips is 2%.

[0038] The preparation method of modified lignin fiber includes the following steps: lignin fiber is soaked in dilute sulfuric acid. After soaking, it is filtered and the filter cake is dried to a moisture content of 5% at a drying temperature of 60°C. Then, the dried filter cake, coupling agent and nano calcium carbonate are thoroughly mixed for 1 hour to obtain modified lignin fiber.

[0039] The concentration of the solute in the dilute sulfuric acid is 0.01 mol / L, and the mass ratio of lignin fiber, nano-calcium carbonate and coupling agent is 1:0.01:0.3.

[0040] The modified conductive oxide is obtained by mixing a conductive oxide, sodium dodecylbenzenesulfonate, and a coupling agent;

[0041] The mass ratio of the conductive oxide, sodium dodecylbenzenesulfonate, and coupling agent is 1:0.1:0.1.

[0042] The particle size of the nano-calcium carbonate in the modified lignin fiber is 20 nm.

[0043] The conductive oxide is at least one of conductive zinc oxide; the coupling agent is a silane coupling agent.

[0044] A method for preparing an antistatic composite monofilament includes the following steps:

[0045] Step 1: PPS chips mixed with modified lignin fibers are dried, melted by screw, spun, stretched and shaped, and microwave-treated to produce core layer monofilaments.

[0046] Step 2: HDPE chips mixed with modified conductive oxides are dried and melted by a screw to form a skin layer;

[0047] Step 3: Composite the core monofilament and the sheath layer prepared in Step 1 and Step 2, spin them, then cool them in a water bath, and finally wind them into an antistatic composite monofilament.

[0048] In step 1, during the drying process, the material is pre-crystallized at 60°C for 1 hour, then heated to 110°C for 1 hour, and held at the preset temperature for 3 hours.

[0049] During screw melting, the extruder's pump feed rate is 300 g / min, and the pressure is 60 kg / cm². 2 Preheating zone temperature: 270℃, melting zone temperature: 285℃, metering zone temperature: 295℃; during spinning, template temperature: 285℃, spinning speed: 50m / min; during stretching and setting, stretch ratio: 4, setting temperature: 150℃.

[0050] During microwave processing: the power of the microwave device is 400W, and the residence time of the core monofilament in the microwave device is 8s.

[0051] In step 2, during the drying process, the material is pre-crystallized at 45°C for 1 hour, then heated to 90°C after 1 hour, and held at the preset temperature for 3 hours.

[0052] When the screw is melting, the extruder feed rate is 300 g / min and the pressure is 50 kg / cm². 2 Preheating zone temperature: 235℃, melting zone temperature: 245℃, metering zone temperature: 255℃.

[0053] In step 3, during the lamination of the core layer monofilament and the sheath layer, the extruder pump feed rate is 100 g / min, the main extruder temperature is 160℃, the die head temperature is 160℃, and the screw pressure is 150 kg / cm². 2 . Example

[0054] The amount of modified lignin fiber added to PPS chips is 22%.

[0055] The amount of modified conductive oxide added to the HDPE chips is 6%.

[0056] The preparation method of modified lignin fiber includes the following steps: lignin fiber is soaked in dilute sulfuric acid. After soaking, it is filtered and the filter cake is dried to a moisture content of 25% at a drying temperature of 90°C. Then, the dried filter cake, coupling agent and nano calcium carbonate are thoroughly mixed for 2 hours to obtain modified lignin fiber.

[0057] The concentration of the solute in the dilute sulfuric acid is 0.5 mol / L, and the mass ratio of lignin fiber, nano-calcium carbonate and coupling agent is 1:0.25:0.6.

[0058] The modified conductive oxide is obtained by mixing a conductive oxide, sodium dodecylbenzenesulfonate, and a coupling agent;

[0059] The mass ratio of the conductive oxide, sodium dodecylbenzenesulfonate, and coupling agent is 1:0.15:0.3.

[0060] The particle size of the nano-calcium carbonate in the modified lignin fiber is 100 nm.

[0061] The conductive oxide is conductive titanium oxide; the coupling agent is a silane coupling agent.

[0062] A method for preparing an antistatic composite monofilament includes the following steps:

[0063] Step 1: PPS chips mixed with modified lignin fibers are dried, melted by screw, spun, stretched and shaped, and microwave-treated to produce core layer monofilaments.

[0064] Step 2: HDPE chips mixed with modified conductive oxides are dried and melted by a screw to form a skin layer;

[0065] Step 3: Composite the core monofilament and the sheath layer prepared in Step 1 and Step 2, spin them, then cool them in a water bath, and finally wind them into an antistatic composite monofilament.

[0066] In step 1, during the drying process, the material is pre-crystallized at 110℃ for 2 hours, then heated to 135℃ after 2 hours, and held at the preset temperature for 6 hours.

[0067] During screw melting, the extruder's pump feed rate is 500 g / min, and the pressure is 150 kg / cm². 2 Preheating zone temperature: 300℃, melting zone temperature: 320℃, metering zone temperature: 320℃; during spinning, template temperature: 320℃, spinning speed: 300m / min; during stretching and setting, stretch ratio: 5.5, setting temperature: 210℃.

[0068] During microwave processing: the power of the microwave device is 1000W, and the residence time of the core monofilament in the microwave device is 3s.

[0069] In step 2, during the drying process, the material is pre-crystallized at 80°C for 2 hours, then heated to 120°C after 2 hours, and kept at the preset temperature for 5 hours.

[0070] When the screw is melting, the extruder feed rate is 550 g / min and the pressure is 150 kg / cm². 2 Preheating zone temperature: 275℃, melting zone temperature: 285℃, metering zone temperature: 285℃.

[0071] In step 3, during the lamination of the core layer monofilament and the sheath layer, the extruder pump feed rate is 150 g / min, the main extruder temperature is 250℃, the die head temperature is 250℃, and the screw pressure is 300 kg / cm². 2 . Example

[0072] The amount of modified lignin fiber added to PPS chips is 15%.

[0073] The amount of modified conductive oxide added to the HDPE chips is 4%.

[0074] The preparation method of modified lignin fiber includes the following steps: lignin fiber is soaked in dilute sulfuric acid. After soaking, it is filtered and the filter cake is dried to a moisture content of 15% at a drying temperature of 70°C. Then, the dried filter cake, coupling agent and nano calcium carbonate are thoroughly mixed for 1.5 hours to obtain modified lignin fiber.

[0075] The concentration of the solute in the dilute sulfuric acid is 0.2 mol / L, and the mass ratio of lignin fiber, nano-calcium carbonate and coupling agent is 1:0.1:0.4.

[0076] The modified conductive oxide is obtained by mixing a conductive oxide, sodium dodecylbenzenesulfonate, and a coupling agent;

[0077] The mass ratio of the conductive oxide, sodium dodecylbenzenesulfonate, and coupling agent is 1:0.12:0.2.

[0078] The particle size of the nano-calcium carbonate in the modified lignin fiber is 50 nm.

[0079] The conductive oxide is a mixture of conductive zinc oxide and conductive titanium oxide in a mass ratio of 2:1; the coupling agent is a phthalate coupling agent.

[0080] A method for preparing an antistatic composite monofilament includes the following steps:

[0081] Step 1: PPS chips mixed with modified lignin fibers are dried, melted by screw, spun, stretched and shaped, and microwave-treated to produce core layer monofilaments.

[0082] Step 2: HDPE chips mixed with modified conductive oxides are dried and melted by a screw to form a skin layer;

[0083] Step 3: Composite the core monofilament and the sheath layer prepared in Step 1 and Step 2, spin them, then cool them in a water bath, and finally wind them into an antistatic composite monofilament.

[0084] In step 1, during the drying process, the material is pre-crystallized at 70℃ for 1.5 hours, then heated to 115℃ after 1.5 hours, and held at the preset temperature for 4 hours.

[0085] During screw melting, the extruder's pump feed rate is 400 g / min, and the pressure is 100 kg / cm². 2 Preheating zone temperature: 280℃, melting zone temperature: 295℃, metering zone temperature: 310℃; during spinning, template temperature: 305℃, spinning speed: 200m / min; during stretching and setting, stretch ratio: 5, setting temperature: 180℃.

[0086] During microwave processing: the power of the microwave device is 800W, and the residence time of the core monofilament in the microwave device is 5s.

[0087] In step 2, during the drying process, pre-crystallize at 60℃ for 1.5h, then raise the temperature to 100℃ after 1.5h, and hold at the preset temperature for 4h.

[0088] When the screw is melting, the extruder feed rate is 450 g / min and the pressure is 100 kg / cm². 2 Preheating zone temperature: 255℃, melting zone temperature: 265℃, metering zone temperature: 265℃.

[0089] In step 3, during the lamination of the core layer monofilament and the sheath layer, the extruder pump feed rate is 120 g / min, the main extruder temperature is 200℃, the die head temperature is 200℃, and the screw pressure is 200 kg / cm². 2 .

[0090] Comparative Example 1,

[0091] The difference between Comparative Example 1 and Example 1 is as follows:

[0092] The preparation method of modified lignin fiber includes the following steps: lignin fiber is soaked in dilute sulfuric acid. After soaking, it is filtered and the filter cake is dried to a moisture content of 25% at a drying temperature of 60°C. Then, the dried filter cake and coupling agent are thoroughly mixed for 1 hour to obtain modified lignin fiber.

[0093] The concentration of the solute in the dilute sulfuric acid is 0.5 mol / L, and the mass ratio of lignin fiber to coupling agent is 1:0.6.

[0094] In Comparative Example 2,

[0095] The difference between Comparative Example 2 and Example 1 is as follows:

[0096] The preparation method of modified lignin fiber includes the following steps: lignin fiber is soaked in dilute sulfuric acid. After soaking, it is filtered and the filter cake is dried to a moisture content of 5% at a drying temperature of 60°C. Then, the dried filter cake and nano calcium carbonate are thoroughly mixed for 1 hour to obtain modified lignin fiber.

[0097] The concentration of the solute in the dilute sulfuric acid is 0.01 mol / L, and the mass ratio of lignin fiber to nano-calcium carbonate is 1:0.01.

[0098] In Comparative Example 3,

[0099] The difference between Comparative Example 3 and Example 1 is as follows:

[0100] The preparation method of modified lignin fiber includes the following steps: lignin fiber is soaked in deionized water, filtered after soaking, the filter cake is dried to a moisture content of 5% at a drying temperature of 60℃, and then the dried filter cake, coupling agent and nano calcium carbonate are thoroughly mixed for 1 hour to obtain modified lignin fiber.

[0101] The concentration of the solute in the dilute sulfuric acid is 0.01 mol / L, and the mass ratio of lignin fiber, nano-calcium carbonate and coupling agent is 1:0.01:0.3.

[0102] In Comparative Example 4,

[0103] The difference between Comparative Example 4 and Example 1 is as follows:

[0104] No modified lignin fibers were added to the HDPE chips that make up the core monofilaments.

[0105] In Comparative Example 5, the difference between Comparative Example 5 and Example 1 is as follows:

[0106] A method for preparing an antistatic composite monofilament includes the following steps:

[0107] Step 1: PPS chips mixed with modified lignin fibers are dried, melted by screw, spun, stretched and shaped to produce core layer monofilaments;

[0108] Step 2: HDPE chips mixed with modified conductive oxides are dried and melted by a screw to form a skin layer;

[0109] Step 3: Composite the core monofilament and the sheath layer prepared in Step 1 and Step 2, spin them, then cool them in a water bath, and finally wind them into an antistatic composite monofilament.

[0110] In Comparative Example 6,

[0111] The difference between Comparative Example 6 and Example 1 is as follows:

[0112] No modified conductive oxides were added to the HDPE chips that make up the skin layer.

[0113] In Comparative Example 7,

[0114] The difference between Comparative Example 7 and Example 1 is as follows:

[0115] No modified conductive oxides were added to the HDPE chips that make up the skin layer; no modified lignin fibers were added to the HDPE chips that make up the core layer monofilaments.

[0116] The performance of the composite monofilaments prepared in Examples 1-3 and Comparative Examples 1-7 was tested.

[0117] Detection method:

[0118] 1. The resistivity of the antistatic functional fibers in Examples 1-3 and Comparative Examples 1-7 was tested using an antistatic resistance tester at an environment of 25°C and 65%RH.

[0119] 2. Mechanical strength test: The strength and elongation at break of the antistatic functional fibers in Examples 1-3 and Comparative Examples 1-7 were tested using a high-precision electronic universal testing machine. The test results are shown in Table 1.

[0120] Table 1

[0121] Resistivity (Ω*cm), Strength (cN / dtex), Elongation at break (%) Example 1: 14.5*10 4 4.0979.4 Example 27.2*10 4 4.0378.7 Example 32.6*10 4 4.1280.9 Comparative Example 14.7*10 4 3.7674.2 Comparative Example 25.8*10 5 4.0879.1 Comparative Example 37.9*10 6 4.2981.5 Comparative Example 48.1*10 6 3.7874.6 Comparative Example 57.8*10 6 4.2581.3 Comparative Example 61.9*10 6 4.0677.9 Comparative Example 73.2*10 9 3.5972.8

[0122] As shown in Table 1, in Examples 1-3, the resistivity of the composite monofilament is less than 7.2*10. 4The resistivity of the modified lignin fiber is Ω*cm, meeting the requirements for antistatic fibers. In Comparative Example 1, no nano-calcium carbonate was added during the preparation of the modified lignin fiber. Its resistivity was close to that of Example 1, but its mechanical strength was significantly lower than that of Example 1. In Comparative Example 2, no coupling agent was added during the preparation of the modified lignin fiber. Its resistivity was higher than that of Example 1, while its mechanical strength was close to that of Example 1. This was mainly because the coupling agent was not placed between the lignin fiber and the nano-calcium carbonate, and the nano-calcium carbonate reacted with sulfuric acid prematurely (before microwave treatment), resulting in a lower degree of carbonization of the lignin fiber. In Comparative Example 3, when preparing the modified lignin fiber, dilute sulfuric acid was replaced with deionized water, resulting in no carbonization of the lignin fiber. Its resistivity was significantly higher than that of the control fiber. Example 2; In Comparative Example 4, no modified lignin fiber was added to the HDPE chips that make up the core layer monofilaments. Its resistivity was close to that of Comparative Example 3, but its mechanical strength was lower than that of Comparative Example 3. In Comparative Example 5, no microwave treatment was performed during the preparation of the composite monofilaments, and its performance in all aspects was close to that of Comparative Example 3. In Comparative Example 6, no modified conductive oxide was added to the HDPE chips that make up the skin layer. Its resistivity was lower than that of Comparative Example 3, and its mechanical strength was slightly lower than that of Example 1. In Comparative Example 7, no modified conductive oxide was added to the HDPE chips that make up the skin layer; no modified lignin fiber was added to the HDPE chips that make up the core layer monofilaments, and its resistivity reached 3.2*10. 9 It lacks antistatic properties and has the lowest mechanical strength among all embodiments and comparative examples. Industrial applicability

[0123] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention. Sequence List Free Content

[0124] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An antistatic composite monofilament, characterized by, It includes a core monofilament and a sheath; the sheath wraps around the core monofilament. PPS chips mixed with modified lignin fibers are dried, screw melted, spun, stretched and shaped, and microwave treated to produce core layer monofilaments. HDPE chips mixed with modified conductive oxides are dried and then melted by a screw to form a skin layer; The modified lignin fiber content in the PPS chips is 8% to 22%. The amount of modified conductive oxide added to the HDPE chips is 2% to 6%.

2. The antistatic composite filament according to claim 1, wherein The method for preparing the modified lignin fiber includes the following steps: immersing the lignin fiber in dilute sulfuric acid, filtering it after immersion, drying the filter cake to a moisture content of 5% to 25% at a drying temperature of 60℃ to 90℃, and then thoroughly mixing the dried filter cake, coupling agent, and nano-calcium carbonate for 1 to 2 hours to obtain the modified lignin fiber. The concentration of the solute in the dilute sulfuric acid is 0.01 mol / L to 0.5 mol / L, and the mass ratio of lignin fiber, nano-calcium carbonate and coupling agent is 1:(0.01 to 0.25):(0.3 to 0.6).

3. An antistatic composite filament according to claim 2, wherein The modified conductive oxide is obtained by mixing a conductive oxide, sodium dodecylbenzenesulfonate, and a coupling agent; The mass ratio of the conductive oxide, sodium dodecylbenzenesulfonate, and coupling agent is 1:(0.1-0.15):(0.1-0.3).

4. An antistatic composite filament according to claim 3, wherein The modified lignin fiber contains nano-calcium carbonate with a particle size of 20nm-100nm.

5. The antistatic composite filament according to claim 3, wherein The conductive oxide is at least one of conductive zinc oxide and conductive titanium oxide; the coupling agent is one of silane coupling agent or phthalate coupling agent.

6. A method of producing the antistatic composite filament according to any one of claims 1 to 5, characterized by, Includes the following steps: Step 1: PPS chips mixed with modified lignin fibers are dried, melted by screw, spun, stretched and shaped, and microwave-treated to produce core layer monofilaments. Step 2: HDPE chips mixed with modified conductive oxides are dried and melted by a screw to form a skin layer; Step 3: Composite the core monofilament and the sheath layer prepared in Step 1 and Step 2, spin them, then cool them in a water bath, and finally wind them into an antistatic composite monofilament.

7. The antistatic composite monofilament according to claim 6, wherein the antistatic composite monofilament is prepared by the method according to claim 6. In step 1, during the drying process, the pre-crystallization is carried out at 60℃~110℃ for 1h~2h, and the temperature is raised to 110℃~135℃ for 1h~2h. After reaching the preset temperature, the temperature is maintained for 3h~6h. When the screw is melting, the extruder's pump feed rate is 300–500 g / min, and the pressure is 60–150 kg / cm². 2 The preheating zone temperature is 270℃~300℃, the melting zone temperature is 285℃~320℃, and the metering zone temperature is 295℃~320℃; during spinning, the template temperature is 285℃~320℃, and the spinning speed is 50℃~300m / min; during stretching and setting, the stretching ratio is 4~5.5, and the setting temperature is 150℃~210℃. During microwave processing: the power of the microwave device is 400W to 1000W, and the residence time of the core monofilament in the microwave device is 3s to 8s.

8. The antistatic composite monofilament according to claim 6, wherein the antistatic composite monofilament is prepared by the method according to claim 6. In step 2, during the drying process, the pre-crystallization is carried out at 45℃~80℃ for 1h~2h, and the temperature is raised to 90℃~120℃ for 1h~2h. After reaching the preset temperature, the temperature is maintained for 3h~5h. When the screw is melting, the extruder feed rate is 300-550 g / min, and the pressure is 50 kg / cm². 2 ~150kg / cm 2 Preheating zone temperature: 235℃~275℃, melting zone temperature: 245℃~285℃, metering zone temperature: 255℃~285℃.

9. The antistatic composite monofilament according to claim 6, wherein the antistatic composite monofilament is prepared by the method according to claim 6. In step 3, when the core layer monofilament and the sheath layer are compounded, the extruder pump feed rate is 100g / min~150g / min, the main machine temperature is 160℃~250℃, the die head temperature is 160℃~250℃, and the screw pressure is 150kg / cm². 2 ~300kg / cm 2 .