Antistatic ultrafine denier fiber and method for producing the same
By using a sea-island structure formed by modified polyethylene resin chips and components such as nano-magnesium hydroxide, the problems of static electricity and compatibility of ultrafine denier fibers are solved, achieving efficient and long-lasting antistatic effect and excellent comprehensive performance of antistatic ultrafine denier fibers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 福建省福地新材料股份有限公司
- Filing Date
- 2026-04-20
- Publication Date
- 2026-06-09
AI Technical Summary
During the production of ultrafine denier fibers, static electricity causes the fibers to repel or adsorb each other, resulting in unstable production, affecting product quality and appearance. Furthermore, antistatic agents have compatibility issues in fiber formulations, affecting the mechanical properties of the fibers.
Modified polyethylene resin chips are used as the base material, combined with components such as nano-magnesium hydroxide, antioxidants and ultraviolet absorbers to form antistatic ultrafine denier fibers with an island structure. The antistatic functional chips are prepared by pre-mixing with polyethylene resin to ensure uniform distribution of antistatic agents. The antistatic and mechanical properties of the fibers are improved by extrusion spinning process.
This achieves a complementary balance between the fiber's high-efficiency antistatic properties and mechanical properties, improving the fiber's durability and production stability, reducing entanglement and adsorption problems caused by static electricity, and ensuring the fiber's overall performance.
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Abstract
Description
Technical Field
[0001] This application relates to the technical field of functional fibers, and in particular to an antistatic ultrafine denier fiber and its preparation method. Background Technology
[0002] The Chemical Fiber Industry Corporation of the Ministry of Textile Industry in my country has stipulated that the single filament fineness (dpf) of ultrafine denier staple fiber should be 0.5-1.3 dtex. Ultrafine denier fibers are finer than ordinary fibers, have a larger specific surface area, and are more fluffy and soft to the touch than traditional fibers. They also possess excellent warmth retention, water resistance, and mildew resistance, overcoming the shortcomings of natural fibers (easily wrinkled) and synthetic fibers (lacking breathability). They are mainly used in artificial suede, high-performance cleaning cloths, high-density waterproof and breathable fabrics, precision instrument wiping cloths, medical materials, and ultrafiltration materials.
[0003] However, the static electricity problem is even more pronounced with microfiber. Static electricity causes the extremely lightweight microfibers to repel or attract each other, making it difficult for the fiber bundles to move stably on the guide rollers and draft rollers. This easily leads to tangling on the rollers, causing frequent fiber breakage and forcing the production line to stop. Static adsorption causes the fibers to rub against the equipment, generating a large number of fuzzy fibers. These fuzzy fibers accumulate further, worsening the production environment and leading to even larger-scale fiber breakage. Moreover, static-charged fibers attract dust, oil, and impurities from the environment, causing defects such as "crystal spots" and "stiff fibers" in nonwoven fabrics, affecting the product's appearance and uniformity.
[0004] Therefore, in order to solve the static electricity problem, antistatic agents are usually added to the fiber formulation. However, there are compatibility issues between antistatic agents and materials. In ES core-sheath composite fibers, the addition of antistatic agents may exist at the sheath-core interface, weakening the bonding force between the sheath and core, affecting the mechanical properties of the fiber, and hindering the drawing and other processing of ultrafine denier fibers. Summary of the Invention
[0005] To address the static electricity problem of ultrafine denier fibers, this application provides an antistatic ultrafine denier fiber and its preparation method.
[0006] This application provides an antistatic ultrafine denier fiber, employing the following technical solution: An antistatic microfiber comprises a core and a sheath. The core comprises the following raw materials: polypropylene, nano-magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770, and calcium stearate. The sheath comprises the following raw materials: modified polyethylene resin chips, ultraviolet absorber UV-327, nano-magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770, and calcium stearate.
[0007] By adopting the above technical solutions, polypropylene, as the core material matrix, provides the core mechanical strength and spinnability of the fiber, has good antistatic properties, and undertakes the mechanical support of the fiber, determining the fiber's basic toughness and processing stability. Nano-magnesium hydroxide, as a flame-retardant component, has both flame-retardant and smoke-suppressing effects, improving the fiber's flame-retardant performance and preventing the generation of large amounts of smoke during combustion. It also has good compatibility with the resin matrix and does not affect fiber molding. Antioxidant 1010 inhibits the thermal oxidative degradation of the core material during processing and use, extending the fiber's service life and improving the core material's thermal stability. Antioxidant 1076 works synergistically with antioxidant 1010 to enhance the anti-thermal oxidation effect, compensating for the shortcomings of a single antioxidant and further improving the core material's aging resistance. Light stabilizer 770 inhibits the degradation of the core material after UV exposure, reducing fiber embrittlement and yellowing caused by light exposure and improving the fiber's weather resistance. Calcium stearate improves the fluidity of the core material raw materials during melt processing, preventing raw material agglomeration, while also improving the smoothness of the spinning process and reducing equipment wear.
[0008] In the leather material, modified polyethylene resin chips serve as the leather matrix, matching the core matrix material to ensure a tight bond between the leather and core, while also imparting a good hand feel and formability to the fiber surface. UV absorber UV-327 directly absorbs external ultraviolet rays, preventing them from penetrating the leather and affecting the core, further enhancing the overall UV resistance of the fiber and preventing surface aging and discoloration. Nano-magnesium hydroxide works synergistically with the nano-magnesium hydroxide in the core to achieve full-section flame retardancy of the fiber, ensuring uniform overall flame retardant performance and meeting flame retardant application requirements. Antioxidant 1010 functions similarly to the antioxidants in the core, inhibiting thermal oxidative degradation of the leather. Combined with antioxidant 1076, it forms a synergistic antioxidant system, improving the leather's thermal stability and aging resistance. Antioxidant 1076 and antioxidant 1010 work synergistically to enhance the leather's resistance to thermal oxidation, preventing cracking and aging caused by high temperatures and oxidation during processing and use. Light stabilizer 770 and UV absorber UV-327 work synergistically to provide dual protection against UV damage to the fibers, improving their weather resistance and extending their lifespan. Calcium stearate improves the fluidity of the leather during melt processing, ensuring uniform coverage of the core material while also enhancing the smoothness of the fiber surface and preventing skeining during spinning.
[0009] The resulting antistatic ultrafine denier fiber has a core material that focuses on ensuring the fiber's mechanical strength, flame retardancy, and long-term stability, while the sheath material focuses on improving the fiber's UV resistance and surface smoothness, achieving complementary performance. Antioxidants 1010 and 1076, light stabilizer 770, UV absorber UV-327, and nano-magnesium hydroxide form a synergistic system, significantly improving the fiber's anti-aging, UV resistance, and flame retardancy. The modified polyethylene resin chips not only have good mechanical properties but also high antistatic properties, giving the antistatic ultrafine denier fiber excellent durability.
[0010] In this application, the antistatic agent is pre-mixed with polyethylene resin to form antistatic functional chips. These chips are similar in shape, size, and density to the base chips, allowing for better physical compatibility and improved uniformity of antistatic addition. This is primarily because the antistatic agent undergoes its first mixing and dispersion with the carrier resin under high shear force during the chip manufacturing process. This means the antistatic agent is relatively uniformly fixed in the carrier resin matrix as tiny particles. When the masterbatch enters the main screw, it only needs to further melt, shear, and evenly distribute these pre-dispersed micro-agglomerates. This is much easier and more thorough than directly breaking up large powder agglomerates (antistatic agent). The chipping method ensures the antistatic agent is uniformly distributed in the fiber matrix in an island-like structure, making it possible to construct a continuous and uniform conductive network throughout the fiber product, thus significantly and stably improving antistatic efficiency. Furthermore, the antistatic agent is encapsulated and protected by the carrier resin within the chips. In the initial stage of entering the screw, it undergoes a relatively mild and gradual melting process, which greatly reduces the risk of decomposition due to localized overheating, thereby reducing the occurrence of bubbles and yellowing. The prepared modified polyethylene resin chips exhibit excellent mechanical properties and antistatic properties.
[0011] Preferably, the modified polyethylene resin chips are composed of glass fiber powder, montmorillonite / POSS composite, polyethylene resin chips, and an antistatic agent.
[0012] By adopting the above technical solution, polyethylene resin chips, as the basic matrix of the modified resin, provide the resin with basic molding properties, mechanical toughness, and spinnability. They are the core component of the modified polyethylene resin chips, determining the resin's basic processing and performance characteristics. Glass fiber powder, as a reinforcing and modifying component, can significantly improve the mechanical strength, rigidity, and abrasion resistance of the modified polyethylene resin, enhance its resistance to deformation, and thus improve the tensile strength and service life of the final fiber. Simultaneously, it exhibits good compatibility with polyethylene resin and does not affect the spinning process.
[0013] The montmorillonite / POSS composite serves as a modifying and enhancing component. Montmorillonite possesses a layered structure, while POSS (polyhedral oligomeric silsesquioxane) exhibits a unique nanostructure. The combination synergistically improves the heat resistance, weather resistance, and dimensional stability of the modified resin, while also enhancing its compatibility with other additives and improving the uniformity of raw material dispersion. The antistatic agent imparts antistatic properties to the modified polyethylene resin, thereby providing the fibers with a long-lasting antistatic effect. This reduces the accumulation of static electricity caused by friction during processing and use, preventing problems such as dust adsorption and entanglement due to static electricity.
[0014] The combination of multiple components has a synergistic effect. Glass fiber provides a rigid skeleton, while montmorillonite / POSS enhances the interfacial bonding. Together, they comprehensively improve the strength, modulus, and heat resistance of the modified polyethylene chips. The antistatic agent, the layered structure of montmorillonite, and the surface of glass fiber jointly construct a multidimensional conductive network, achieving a highly efficient and long-lasting antistatic effect.
[0015] Preferably, the montmorillonite / POSS complex is composed of methacryloyloxypropyl POSS, a silane coupling agent, and pretreated montmorillonite.
[0016] By adopting the above technical solution, methacryloxypropyl POSS, as the core functional component of the composite, possesses a unique nanoscale cage structure, which significantly improves the composite's heat resistance, rigidity, and dimensional stability. The methacryloxypropyl group in its molecular structure can form good interactions with polyethylene resin and other components, improving the compatibility of the composite with the resin matrix and preventing aggregation. A silane coupling agent connects methacryloxypropyl POSS to pretreated montmorillonite, reducing the interfacial tension between the two and enhancing the internal binding tightness of the composite. Simultaneously, one end of the silane coupling agent can bind to the active groups on the surface of the pretreated montmorillonite, while the other end can interact with POSS and polyethylene resin, further improving the dispersion uniformity of the composite and other components in the modified polyethylene resin chips.
[0017] Pretreated montmorillonite, as a reinforcing and modifying substrate for composites, provides excellent mechanical reinforcement due to its layered structure. It can also adsorb POSS molecules to form a layer-cage synergistic structure. The oleophilicity of the surface of pretreated montmorillonite is enhanced, transforming it into a more easily intercalated morphology. This effectively improves its compatibility with polyethylene resin and POSS, prevents montmorillonite from agglomerating in the resin, and fully utilizes its layered reinforcement and barrier functions.
[0018] The combination of these three components has a synergistic effect. The pretreated montmorillonite layers are expanded, which facilitates the entry of polymer molecular chains into the interlayer and achieves nanoscale dispersion. The silane coupling agent connects POSS and montmorillonite. One end of the silane coupling agent condenses with the hydroxyl groups on the surface of montmorillonite to form a covalent bond, while the other end, the methacryloyl group, binds to a similar structure on POSS through copolymerization or hydrogen bonding, achieving chemical intercalation rather than physical mixing. The resulting montmorillonite / POSS composite has a stable structure, and POSS is not easily desorbed from the interlayer of montmorillonite during subsequent processing, ensuring functional durability. It combines the nano-reinforcement and thermal stability of POSS with the barrier and nucleation effects of montmorillonite, resulting in synergistic enhancement.
[0019] Preferably, the preparation of the pretreated montmorillonite includes the following steps: dispersing montmorillonite in a sodium hydroxide solution, soaking for 20-25 minutes, washing with water, then dispersing it in deionized water, adding nano-fumed silica and metal-organic framework materials, sonicating for 1-2 hours, filtering, and drying to obtain pretreated montmorillonite.
[0020] By employing the above-mentioned technical solution, immersion in sodium hydroxide solution removes some impurities from montmorillonite, achieving surface activation and preliminary sodiumization, thus creating an active surface for subsequent composite with nano-fumed silica and MOFs. The surface of nano-fumed silica is rich in silanol groups, which can form hydrogen bonds or condensation with Al-OH or Si-OH at the edges of montmorillonite layers, coating or anchoring it to the montmorillonite surface and interlayer edges. Furthermore, nano-SiO2 can penetrate the interlayer spaces of montmorillonite, further widening the interlayer spacing and forming an inorganic support structure. Metal-organic framework materials possess ultra-high specific surface area, controllable pores, and abundant unsaturated metal sites; introducing them into the interlayer spaces or surface of montmorillonite endows it with corresponding functions and helps to widen the interlayer spacing.
[0021] The synergy of these three elements results in a more robust anchoring of nano-SiO2 on the surface and interlayer edges of montmorillonite, forming a stable inorganic-inorganic composite structure. MOFs are more evenly dispersed on the montmorillonite surface through the bridging effect of nano-SiO2, avoiding agglomeration. Some small-sized MOF nanocrystals can intercalate into the interlayer of montmorillonite, achieving true nanocomposite properties. This yields high-performance pretreated montmorillonite that integrates structural regulation, surface modification, and functional implantation, further optimizing its reinforcement and compatibility effects and providing a guarantee for the performance improvement of subsequent modified polyethylene resins.
[0022] Preferably, the antistatic agent is composed of stearyltrimethylammonium chloride, nano zinc oxide, and ethylene glycol monostearate.
[0023] By employing the above technical solution, stearyltrimethylammonium chloride forms an ion-conductive layer on the fiber surface, rapidly reducing surface resistance and achieving rapid antistatic action. Nano-zinc oxide, as an inorganic antistatic functional component, enhances the durability and heat resistance of the antistatic effect, while also possessing certain antibacterial and UV-shielding properties. Stearyltrimethylammonium chloride can be adsorbed onto the surface of nano-zinc oxide through electrostatic interactions, preventing nanoparticle aggregation. Ethylene glycol monostearate has lubricating, dispersing, and internal plasticizing effects, improving the dispersibility of each component in the resin, preventing local aggregation of stearyltrimethylammonium chloride, ensuring uniform antistatic effect, and simultaneously helping to reduce triboelectric charging and improve long-term antistatic stability. The ester groups of ethylene glycol monostearate can form hydrogen bonds or coordination bonds with the hydroxyl groups on the surface of nano-zinc oxide, coating the surface of nano-zinc oxide and forming a steric hindrance layer, preventing nanoparticles from re-aggregating during processing and ensuring the nano-effect. The combination of these three components balances the speed of antistatic onset, long-term effectiveness, and processing adaptability, meeting the requirements of melt spinning processes for ultrafine denier fibers.
[0024] Preferably, the weight ratio of the skin layer to the core layer is 1:2-4.
[0025] By adopting the above technical solution, within this weight ratio range, it can ensure that the sheath layer uniformly and completely covers the core layer, giving the fiber surface excellent antistatic, UV resistance, and smooth feel, while also providing the core layer with sufficient mechanical strength, flame retardant properties, and structural stability. At the same time, it is compatible with the composite spinning process of ultra-fine denier fibers, ensuring smooth spinning, uniform fiber cross-section, and strong sheath-core bonding, making it less prone to defects such as peeling and core exposure.
[0026] Secondly, this application also provides a method for preparing antistatic ultrafine denier fibers, comprising the following steps: (1) Core material preparation: Mix polypropylene, nano magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770 and calcium stearate, melt them, and set aside. (2) Leather preparation: Mix modified polyethylene resin chips, UV absorber UV-327, nano magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770, and calcium stearate, melt them, and set aside. (3) The core material and the sheath material are extruded and spun to obtain antistatic ultrafine denier fiber.
[0027] By adopting the above technical solution and preparation method, the operation is simple and helps to improve the mechanical properties, wear resistance and crack resistance of the prepared antistatic ultrafine denier fiber. The obtained antistatic ultrafine denier fiber has good comprehensive properties such as durability.
[0028] Preferably, the melt extrusion temperature is 210-215℃, the spinning temperature is 230-235℃, and the spinning speed is 2300-2400 m / min.
[0029] In summary, this application has the following beneficial effects: 1. In this application, the antistatic agent is premixed with polyethylene resin to prepare antistatic functional chips, which enables them to be better compatible and physically blended, improves the uniformity of antistatic addition, and the prepared modified polyethylene resin chips have excellent mechanical properties and antistatic properties, which in turn gives the fibers excellent comprehensive properties.
[0030] 2. The antistatic ultrafine denier fiber obtained in this application has a core material that focuses on ensuring the fiber's mechanical strength, flame retardancy, and long-term stability, while the sheath material focuses on improving the fiber's UV resistance and surface smoothness, thus achieving complementary performance. The modified polyethylene resin chips not only have good mechanical properties but also high antistatic properties, which makes the antistatic ultrafine denier fiber have excellent durability.
[0031] 3. In this application, modified polyethylene resin chips are used as the leather matrix, which matches the core matrix material to ensure the tightness of the leather-core bond, while giving the fiber surface a good feel and formability. Detailed Implementation
[0032] The present application will be further described in detail below with reference to the embodiments.
[0033] The raw materials used in the examples and comparative examples are all commercially available.
[0034] Preparation Example 1 The preparation of modified polyethylene resin chips includes the following: 2 kg of glass fiber powder was heated at 155 °C for 5 min, then dispersed in 15 L of anhydrous ethanol, 5 kg of montmorillonite / POSS composite was added, stirred at 58 °C for 18 min, and dried to obtain composite powder. 10 kg of polyethylene resin chips, composite powder, and 1 kg of antistatic agent were mixed and modified under ultraviolet light (wavelength 185 nm) and argon atmosphere for 24 h. Then, the mixture was melt-extruded at 210 °C and sliced to obtain modified polyethylene resin chips.
[0035] The montmorillonite / POSS composite was prepared as follows: 1 kg of methacryloyloxypropyl POSS was dispersed in 20 L of tetrahydrofuran solution, 0.5 kg of silane coupling agent KH550 was added, and the mixture was stirred for 35 min. Then, 3 kg of pretreated montmorillonite was added, and the mixture was stirred at 125 °C for 3 h. The mixture was then freeze-dried (at -50 °C for 24 h) to obtain the montmorillonite / POSS complex.
[0036] The preparation of pretreated montmorillonite includes the following steps: 2 kg of montmorillonite is dispersed in 9 L of sodium hydroxide solution, soaked for 25 min, washed with water, then dispersed in 15 L of deionized water, 0.8 kg of nano-fumed silica and 0.07 kg of metal-organic framework material (MOF-841, purchased from Xi'an Qiyue Biotechnology Co., Ltd.) are added, ultrasonicated for 2 h, filtered, and dried to obtain pretreated montmorillonite.
[0037] Preparation Example 2 The difference from Preparation Example 1 is that glass fiber powder is not added in the preparation of the modified polyethylene resin chips.
[0038] Preparation Example 3 The difference from Preparation Example 1 is that no montmorillonite / POS composite was added during the preparation of the modified polyethylene resin chips.
[0039] Preparation Example 4 The difference from Preparation Example 1 is that no antistatic agent is added in the preparation of the modified polyethylene resin chips.
[0040] Preparation Example 5 The difference from Preparation Example 1 is that methacryloyloxypropyl POSS is not added in the preparation of the montmorillonite / POSS complex.
[0041] Preparation Example 6 The difference from Preparation Example 1 is that no silane coupling agent is added in the preparation of the montmorillonite / POSS composite.
[0042] Preparation Example 7 The difference from Preparation Example 1 is that no nano-fumed silica is added in the preparation of pretreated montmorillonite.
[0043] Preparation Example 8 The difference from Preparation Example 1 is that no metal-organic framework material is added in the preparation of pretreated montmorillonite.
[0044] Example 1 An antistatic ultrafine denier fiber, comprising a core material and a sheath material. The core material, by weight, comprises the following raw materials: 20 kg of polypropylene, 2.2 kg of nano magnesium hydroxide, 0.2 kg of antioxidant 1010, 0.1 kg of antioxidant 1076, 0.1 kg of light stabilizer 770, and 0.4 kg of calcium stearate. The sheath material, by weight, comprises the following raw materials: 80 kg of modified polyethylene resin chips, 0.4 kg of ultraviolet absorber UV-327, 4 kg of nano magnesium hydroxide, 0.4 kg of antioxidant 1010, 0.3 kg of antioxidant 1076, 0.5 kg of light stabilizer 770, and 0.8 kg of calcium stearate.
[0045] The modified polyethylene resin chips were prepared in Preparation Example 1.
[0046] The antistatic agent consists of 0.3 kg stearyltrimethylammonium chloride (purchased from Shandong Yuquan New Material Technology Co., Ltd.), 0.5 kg nano zinc oxide, and ethylene glycol monostearate.
[0047] The above-mentioned method for preparing antistatic ultrafine denier fiber includes the following steps: (1) Core material preparation: Mix polypropylene, nano magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770 and calcium stearate, melt them, and set aside. (2) Leather preparation: Mix modified polyethylene resin chips, UV absorber UV-327, nano magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770, and calcium stearate, melt them, and set aside. (3) The core material and the sheath material are extruded and spun to obtain antistatic ultrafine denier fiber with a single filament fineness (dpf) of 0.5dtex.
[0048] The melt extrusion temperature is 210℃, the spinning temperature is 230℃, and the spinning speed is 2300 m / min.
[0049] The weight ratio of the cortex to the core is 1:4.
[0050] Example 2: An antistatic ultrafine denier fiber, which differs from Example 1 in that the modified polyethylene resin chips are prepared from Preparation Example 2.
[0051] Example 3: An antistatic ultrafine denier fiber, which differs from Example 1 in that the modified polyethylene resin chips were prepared in Preparation Example 3.
[0052] Example 4: An antistatic ultrafine denier fiber, which differs from Example 1 in that the modified polyethylene resin chips are prepared from Preparation Example 4.
[0053] Example 5: An antistatic ultrafine denier fiber, which differs from Example 1 in that the modified polyethylene resin chips are prepared from Preparation Example 5.
[0054] Example 6: An antistatic ultrafine denier fiber, which differs from Example 1 in that the modified polyethylene resin chips were prepared in Example 6.
[0055] Example 7: An antistatic ultrafine denier fiber, which differs from Example 1 in that the modified polyethylene resin chips were prepared in Preparation Example 7.
[0056] Example 8: An antistatic ultrafine denier fiber, which differs from Example 1 in that the modified polyethylene resin chips were prepared in Example 8.
[0057] Comparative Example 1 An antistatic ultrafine denier fiber differs from Example 1 in that the modified polyethylene resin chips are replaced by an equal amount of polyethylene resin chips.
[0058] The performance testing experiment was conducted on an antistatic ultrafine denier fiber prepared in Examples 1-8 and Comparative Example 1. The breaking strength was determined in accordance with the standard GB / T14344-2022 Test Method for Tensile Properties of Chemical Fiber Filaments, where the tensile speed was 30 mm / min.
[0059] Anti-photoaging performance: The sample was treated with ultraviolet light, and the fracture strength after the photo-treatment was measured. The fracture strength retention rate was calculated as follows: Fracture strength retention rate = (fracture strength after photo-treatment / fracture strength before photo-treatment) x 100%.
[0060] The ultraviolet irradiation treatment conditions were as follows: the distance between the ultraviolet lamp and the sample was 15 cm, the power was 22 W, the wavelength was 340 nm, and the ultraviolet irradiation treatment lasted for 40 h.
[0061] Abrasion resistance test: Abrasion resistance was tested according to GB / T21196.3-2007 "Textiles - Martindale method - Determination of abrasion resistance of fabrics - Part 3: Determination of mass loss". The abrasion resistance index Ai = n / Am was measured, where n refers to the total number of friction cycles and Am refers to the mass loss under the total number of friction cycles, in grams. The test results are shown in Table 1.
[0062] Table 1 Test data for the examples and comparative examples
[0063] As shown in Table 1, the antistatic ultrafine denier fiber prepared in Example 1 of this application exhibits good mechanical properties, abrasion resistance, and durability. Specifically, the tensile strength of Example 1 is 5.68 cN / dtex, the tensile strength retention rate after aging is 95%, and the abrasion resistance index is 0.98 mg / cycle. It is evident that the antistatic ultrafine denier fiber prepared in this application possesses good comprehensive performance. The modified polyethylene resin chips not only have good mechanical properties but also high antistatic properties, resulting in excellent durability of the antistatic ultrafine denier fiber. The combination of multiple components has a synergistic effect, thereby achieving a highly efficient and long-lasting antistatic effect and excellent mechanical stability in the fiber.
[0064] In the preparation of modified polyethylene resin chips in Examples 2-4, glass fiber powder, montmorillonite / POSS composite, and antistatic agent were not added, respectively. Table 1 shows that the tensile strength, aging tensile strength retention rate, and abrasion resistance index of Examples 2-4 were all worse than those of Example 1. This indicates that glass fiber powder, as a reinforcing and modifying component, can significantly improve the mechanical strength, rigidity, and abrasion resistance of the modified polyethylene resin, improve the resin's resistance to deformation, and thus improve the tensile strength and service life of the final fiber. The montmorillonite / POSS composite, as a modifying and enhancing component, combines montmorillonite with a layered structure and POSS with a unique nanostructure. The combination synergistically improves the heat resistance, weather resistance, and dimensional stability of the modified resin, while also improving the compatibility of the resin with other additives and enhancing the uniformity of raw material dispersion. The antistatic agent imparts antistatic properties to the modified polyethylene resin, thereby giving the fiber a long-lasting antistatic effect, while also improving the fiber's mechanical properties and abrasion resistance.
[0065] In Examples 5-6, neither methacryloyloxypropyl POSS nor silane coupling agent was added during the preparation of the montmorillonite / POSS composites. Table 1 shows that the fracture strength, aging fracture strength retention rate, and abrasion resistance index of Examples 5-6 were inferior to Example 1, but superior to Example 3. This indicates that methacryloyloxypropyl POSS, as the core functional component of the composite, possesses a unique nanoscale cage structure, which significantly improves the composite's heat resistance, rigidity, and dimensional stability, subsequently improving compatibility with the resin matrix and enhancing the overall performance of the resin. One end of the silane coupling agent can bind to the active groups on the surface of the pretreated montmorillonite, while the other end can interact with POSS and polyethylene resin, further improving the dispersion uniformity of the composite and other components in the modified polyethylene resin chips, thereby promoting the overall performance of the resin.
[0066] In Examples 7-8, no nano-fumed silica or metal-organic framework (MOF) materials were added during the preparation of the pretreated montmorillonite. Table 1 shows that the fracture strength, aging fracture strength retention rate, and abrasion resistance index of Examples 7-8 were all inferior to those of Example 1. This indicates that nano-SiO2 is more firmly anchored on the surface and interlayer edges of the montmorillonite, forming a stable inorganic-inorganic composite structure. MOFs are more uniformly dispersed on the montmorillonite surface through the bridging effect of nano-SiO2, avoiding agglomeration. Some small-sized MOF nanocrystals can intercalate into the interlayer of montmorillonite, achieving nanocomposite properties. This results in a high-performance pretreated montmorillonite that integrates structural regulation, surface modification, and functional implantation, further optimizing its reinforcement and compatibility effects, and providing a guarantee for the subsequent performance improvement of modified polyethylene resin.
[0067] Comparative Example 1, where the modified polyethylene resin chips were replaced by an equal amount of polyethylene resin chips, shows in Table 1 that the tensile strength, aging tensile strength retention rate, and abrasion resistance index of Comparative Example 1 are significantly worse than those of Example 1. This indicates that the modified polyethylene resin chips of this application not only possess better mechanical properties but also have high antistatic properties, resulting in excellent durability of the antistatic ultrafine denier fibers.
[0068] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. An antistatic ultrafine denier fiber, characterized in that, It includes a core material and a sheath material. The core material includes the following raw materials: polypropylene, nano magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770, and calcium stearate. The sheath material includes the following raw materials: modified polyethylene resin chips, ultraviolet absorber UV-327, nano magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770, and calcium stearate.
2. The antistatic ultrafine denier fiber according to claim 1, characterized in that, The modified polyethylene resin chips are composed of glass fiber powder, montmorillonite / POSS composite, polyethylene resin chips, and an antistatic agent.
3. The antistatic ultrafine denier fiber according to claim 2, characterized in that, The montmorillonite / POSS complex consists of methacryloyloxypropyl POSS, a silane coupling agent, and pretreated montmorillonite.
4. The antistatic ultrafine denier fiber according to claim 3, characterized in that, The preparation of the pretreated montmorillonite includes the following steps: dispersing montmorillonite in a sodium hydroxide solution, soaking for 20-25 minutes, washing with water, then dispersing it in deionized water, adding nano-fumed silica and metal-organic framework materials, sonicating for 1-2 hours, filtering, and drying to obtain pretreated montmorillonite.
5. The antistatic ultrafine denier fiber according to claim 2, characterized in that, The antistatic agent is composed of stearyltrimethylammonium chloride, nano zinc oxide, and ethylene glycol monostearate.
6. The antistatic ultrafine denier fiber according to claim 1, characterized in that, The weight ratio of the cortex to the core is 1:2-4.
7. The method for preparing antistatic ultrafine denier fiber according to claim 1, characterized in that, Includes the following steps: (1) Core material preparation: Mix polypropylene, nano magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770 and calcium stearate, melt them, and set aside. (2) Leather preparation: Mix modified polyethylene resin chips, UV absorber UV-327, nano magnesium hydroxide, antioxidant 1010, antioxidant 1076, light stabilizer 770, and calcium stearate, melt them, and set aside. (3) The core material and the sheath material are extruded and spun to obtain antistatic ultrafine denier fiber.
8. The method for preparing antistatic ultrafine denier fiber according to claim 7, characterized in that, The melt extrusion temperature is 210-215℃, the spinning temperature is 230-235℃, and the spinning speed is 2300-2400 m / min.