Special spinning oil agent for PEEK fine-denier monofilament

Abstract

The invention discloses a special spinning oil agent for PEEK fine denier monofilament, which comprises the following components in percentage by mass: 35-65% of smoothing agent, which is prepared by mixing heat-resistant synthetic ester and polyether modified siloxane according to the mass ratio of (2-5): 1; the composite antistatic agent is formed by mixing alkyl sulfonate and potassium alkyl phosphate according to the mass ratio of 1: (1-2); the compound emulsifier is formed by mixing fatty alcohol-polyoxyethylene ether and castor oil polyoxyethylene ether according to the mass ratio of (1-3): 1; 4-12% of a high temperature resistant additive, which is tricresyl phosphate; 1-6% of a bundling agent which is a polyoxyethylene ether compound; 0.5-4% of a fiber splitting agent, which is a siloxane derivative; the functional additive is prepared by mixing a hindered phenol antioxidant and nano silicon dioxide according to the mass ratio of (1-3): 1; and 5-15% of deionized water. The high-temperature-resistant antistatic emulsion has the advantages of excellent high-temperature resistance, antistatic effect and emulsion stability.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical fiber processing aids, and particularly relates to a spinning oil agent special for PEEK fine denier monofilaments. Background Art

[0002] As a high-performance thermoplastic engineering plastic, polyetheretherketone (PEEK) is widely used in the fields of aerospace, medical treatment, fuel cells, etc. due to its excellent mechanical properties, high temperature resistance, chemical stability and good processing performance. Especially in the field of proton exchange membrane (PEM) fuel cells, PEEK fine denier fibers are often used as additive materials for substrates to improve the mechanical strength and comprehensive performance of proton exchange membranes.

[0003] In the process of PEEK spinning, the use of spinning oil agent is crucial, which can ensure the smooth progress of the spinning process and improve the post-processing performance and product quality of fibers. However, traditional chemical fiber spinning oil agents are difficult to meet the spinning requirements of PEEK fine denier monofilaments. The core components of traditional spinning oil agents generally include: mineral oil / ordinary ester smoothing agents, single antistatic agents, and conventional emulsifier compounding. However, traditional chemical fiber spinning oil agents generally have the following technical defects: 1) Insufficient high-temperature lubrication performance: Traditional oil agents mostly use mineral oil or ordinary fatty acid esters as smoothing agents, whose heat resistance is generally not more than 200°C and the viscosity is relatively high. While the PEEK spinning temperature is as high as above 340°C, traditional oil agents are prone to decomposition and carbonization at such high temperatures, generating coke deposits, resulting in surface defects of fibers, which not only affects the spinning quality but also pollutes the equipment; moreover, the lubricity of traditional oil agents is poor and cannot meet the requirements under high-friction conditions in the PEEK spinning process, easily causing surface wear of fibers and affecting the strength and appearance quality of fibers; 2) Insufficient antistatic performance: The electrostatic conduction efficiency of traditional oil agents decreases in a high-temperature and low-humidity environment, and the electrostatic accumulation on the fiber surface is serious. The electrostatic accumulation on the fiber surface causes problems such as fiber entanglement and dust adsorption, seriously affecting the spinning continuity; 3) Poor emulsion stability: The conventional emulsifier compounding technology cannot balance the dispersion stability of oil-phase components (such as high-temperature resistant additives, synthetic esters) at high temperatures, and is prone to demulsification and delamination phenomena, resulting in uneven oiling and further affecting the spinning quality; 4) Imbalance between bundling and fiber splitting functions: The diameter of PEEK fine denier monofilaments is extremely fine, reaching 0.1 - 0.5 μm. The high viscosity and poor fluidity of traditional oil agents will cause fiber adhesion and cannot meet the forming requirements of fine denier fibers. Moreover, the synergistic effect between the bundling agent (such as polyacrylate) and the fiber splitting agent (such as silicone oil) in traditional oil agents is insufficient, and problems such as difficult post-processing fiber splitting due to too strong fiber bundle binding force or single fiber breakage caused by excessive fiber splitting often occur; 5) Insufficient functional durability: Lack of effective antioxidant and surface enhancement components, the spinning oil is prone to performance degradation during storage and use, and cannot meet the requirements of long-term continuous spinning. Summary of the Invention

[0004] The object of the present invention is to provide a special spinning oil for PEEK fine denier monofilaments with excellent high-temperature lubrication performance, antistatic performance, emulsion stability, and fiber bundling and fiber splitting effects.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A special spinning oil for PEEK fine denier monofilaments, comprising the following components by mass percentage: Smoothing agent 35-65%, the smoothing agent is composed of a heat-resistant synthetic ester and a polyether-modified silicone in a mass ratio of (2-5):1; Compound antistatic agent 4-12%, the compound antistatic agent is composed of an alkyl sulfonate and a potassium alkyl phosphate in a mass ratio of 1:(1-2); Compound emulsifier 18-35%, the compound emulsifier is composed of a fatty alcohol polyoxyethylene ether (AEO-9) and a castor oil polyoxyethylene ether (EL-40) in a mass ratio of (1-3):1; High-temperature resistant additive 4-12%, the high-temperature resistant additive is tricresyl phosphate; Bundling agent 1-6%, the bundling agent is a polyoxyethylene ether compound; Fiber splitting agent 0.5-4%, the fiber splitting agent is a silicone derivative; Functional additive 2-6%, which is composed of a hindered phenol antioxidant and nano-silica with a particle size ≤50 nm in a mass ratio of (1-3):1; Deionized water 5-15%.

[0006] Furthermore, for the above-mentioned special spinning oil for PEEK fine denier monofilaments, among them: the heat-resistant synthetic ester is pentaerythritol tetraoctanoate or trimethylolpropane trioleate.

[0007] Furthermore, for the above-mentioned special spinning oil for PEEK fine denier monofilaments, among them: the molecular weight of the polyether-modified silicone in the smoothing agent is 2000-5000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (2-5):1.

[0008] Furthermore, for the above-mentioned special spinning oil for PEEK fine denier monofilaments, among them: in the compound antistatic agent, the alkyl sulfonate is sodium dodecylbenzenesulfonate, and the potassium alkyl phosphate is potassium monolauryl phosphate.

[0009] Further, for the above-mentioned special spinning finish for PEEK fine denier monofilament, wherein: the bundling agent is dodecyl polyoxyethylene ether.

[0010] Further, for the above-mentioned special spinning finish for PEEK fine denier monofilament, wherein: the fiber separating agent is polyether modified silicone, and the molecular weight of the polyether modified silicone in the fiber separating agent is 1000 - 3000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (1 - 3):1.

[0011] Further, for the above-mentioned special spinning finish for PEEK fine denier monofilament, wherein: the hindered phenol antioxidant is one or more of antioxidant 1010 and antioxidant 1076.

[0012] By implementing the above technical solutions, the beneficial effects of the present invention are: (1) excellent high-temperature resistance: through the 350°C thermogravimetric test, the mass loss within 1 hour is ≤5%, which is significantly better than the commercially available traditional finish (the weight loss rate of the traditional finish ≥15%); (2) long-lasting antistatic effect: during the spinning process, the static voltage on the fiber surface is ≤500V, which is 70% lower than that of the traditional finish, effectively solving the production problems caused by static electricity; (3) strong emulsion stability: there is no stratification after storing at room temperature for 6 months and accelerating aging at 50°C for 2 months, meeting the long-term storage requirements of industrialization; (4) optimized processing performance: the fiber bundling index (CI) is 65 - 75, and the fiber separating index (DI) is 30 - 40, which is in the ideal processing range, and the broken-end rate is reduced by more than 40% compared with the prior art; (5) diversified functions: it has both antioxidant and surface enhancement functions, improving the adaptability of the fiber in post-processing. Specific embodiments

[0013] In order to make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the embodiments.

[0014] A special spinning finish for PEEK fine denier monofilament includes the following components by mass percentage: The smoothing agent is 35 - 65%, and the smoothing agent is composed of a heat-resistant synthetic ester and polyether modified silicone mixed in a mass ratio of (2 - 5):1; wherein, the heat-resistant synthetic ester is pentaerythritol tetraoctanoate or trimethylolpropane trioleate; the molecular weight of the polyether modified silicone in the smoothing agent is 2000 - 5000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (2 - 5):1; The composite antistatic agent is 4 - 12%, and the composite antistatic agent is composed of alkyl sulfonate and potassium alkyl phosphate mixed in a mass ratio of 1:(1 - 2); wherein, the alkyl sulfonate is sodium dodecylbenzenesulfonate, and the potassium alkyl phosphate is potassium monolauryl phosphate (CAS 39322 - 78 - 6); 18 - 35% of compound emulsifier, the compound emulsifier is composed of fatty alcohol polyoxyethylene ether (AEO - 9) and castor oil polyoxyethylene ether (EL - 40) mixed in a mass ratio of (1 - 3):1; 4 - 12% of high - temperature resistant additive, the high - temperature resistant additive is tricresyl phosphate; 1 - 6% of bundling agent, the bundling agent is a polyoxyethylene ether compound; the bundling agent is dodecyl polyoxyethylene ether; 0.5 - 4% of fiber - separating agent, the fiber - separating agent is a silicone derivative; the fiber - separating agent is polyether - modified silicone, and the molecular weight of the polyether - modified silicone in the fiber - separating agent is 1000 - 3000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (1 - 3):1; 2 - 6% of functional additive, which is composed of a hindered phenol antioxidant and nano - silica with a particle size ≤ 50nm mixed in a mass ratio of (1 - 3):1; among them, the hindered phenol antioxidant is one or more of antioxidant 1010 and antioxidant 1076; 5 - 15% of deionized water.

[0015] The preparation method of the above - mentioned special spinning oil agent for PEEK fine denier monofilament is as follows: S1: Preparation of water phase: Add deionized water to the reaction kettle, start stirring and heat up to 55 - 65°C; then add the compound emulsifier and continuously stir for 30 - 40 minutes until a uniform and transparent solution is formed; S2: Preparation of oil phase: In another container, add the smoothing agent and high - temperature resistant additive, heat up to 70 - 80°C and disperse at high speed (2000rpm) for 20min, stir evenly to form a pre - emulsion; S3: Emulsification: Slowly add the oil phase obtained in S2 to the water phase obtained in S1, while increasing the stirring speed to 1500 - 2000 rpm, and carry out high - shear emulsification for 30 - 50 minutes to form a uniform emulsion; S4: Adding other components: Reduce the stirring speed to 300 - 600 rpm, then add the compound antistatic agent, bundling agent, fiber - separating agent and functional additive in sequence, and continue to stir for 40 - 60 minutes to make each component fully dispersed and uniform, obtaining the oil agent; S5: Homogenization and filtration: Pass the oil agent obtained in S4 through a high - pressure homogenizer and homogenize it 1 - 2 times under a pressure of 60 - 80 MPa to further refine the emulsion particles, and then filter with a 0.2 - 0.5μm filter to remove impurities and undispersed particles, obtaining the finished oil agent.

[0016] To more clearly explain the formulation of this oil agent, the synergistic action mechanism of each component in the formulation of this oil agent is described below: (1)Smoothing agent: The heat-resistant synthetic ester forms a durable lubricating film during the high-temperature spinning process with a high flash point (≥320°C) and low volatility, reducing the friction coefficient between the fiber and the godet (which can be reduced to below 0.15); the polyether-modified silicone improves the surface smoothness of the fiber through the polyether chain segment, and at the same time the polyether group enhances the compatibility with the aqueous phase, making the smoothing agent more evenly dispersed in the emulsion. The combination of the two produces a synergistic effect of "high-temperature lubrication + interfacial affinity". (2)Compound antistatic agent: The sulfonic acid group of alkyl sulfonate and the phosphate group of potassium alkyl phosphate form a bipolar conductive network, adsorbing trace moisture in the air on the fiber surface, and can form an ion conductive layer with a thickness of about 5 - 10 nm, quickly conducting static charges and reducing the surface resistivity of the fiber to below 10 9 Ω; In the compound antistatic agent, potassium alkyl phosphate acts as a high-temperature long-term antistatic agent in the formulation. By compounding with alkyl sulfonate, it solves the problem of static charge accumulation during high-speed spinning of PEEK fibers and at the same time avoids the thermal decomposition defect of traditional antistatic agents; its selection and ratio need to strictly follow the requirements of heat resistance, compatibility and environmental protection; after optimizing the compounding ratio, the antistatic effect is improved by more than 30% compared with single components, effectively suppressing static charge accumulation in high-temperature and low-humidity environments. (3)Compound emulsifier: The short-chain polyoxyethylene group (EO = 9) of fatty alcohol polyoxyethylene ether (AEO-9) provides strong hydrophilicity, and the long-chain castor oil-modified structure of castor oil polyoxyethylene ether (EL-40) enhances the solubilization ability for oil-phase components. The two are compounded in a specific ratio to form a stable oil-in-water (O / W) emulsion with an HLB value of 12 - 14, and the emulsion particle size is controlled within 1 - 5 μm. After a 48-hour thermal stability test at 120°C, there is no layering. (4)High-temperature resistant additive: Tricresyl phosphate is used as a high-temperature resistant plasticizer. On the one hand, it increases the glass transition temperature of the oil agent system (Tg≥150°C) and inhibits component migration at high temperatures; on the other hand, it forms a chemical adsorption layer with the fiber surface, enhancing the adhesion force of the lubricating film and increasing the retention rate of the oil agent on the fiber surface by 25%. (5)Balance of bundling agent and fiber separating agent: The polyoxyethylene ether-based bundling agent forms physical cross-linking points on the fiber surface through hydrogen bonding, controlling the single-filament cohesion force within 5 - 8 cN / tex to meet the bundling requirements of high-speed spinning (≥3000 m / min); the silicone derivative fiber separating agent forms a nano-level lubricating isolation layer between the fibers, reducing the friction force between single filaments (fiber separating force ≤ 3 cN / tex). The combination of the two achieves precise control of "no bundling dispersion and no fiber brittleness during fiber separation". (6) Functional additives: The hindered phenol antioxidant captures the free radicals generated by the oxidation of the spinning finish, extending the storage period of the spinning finish to more than 12 months; nano-silica forms a chemical bond with the carbonyl group on the fiber surface through surface hydroxyl groups, enhancing the surface hardness of the fiber (microhardness HV≥50) and wear resistance, and reducing the hairiness defects during post-processing. (7) Deionized water: Achieves uniform dispersion and stable emulsification of the spinning finish components; enables AEO-9 and EL-40 in the composite emulsifier to form a stable emulsion through water, evenly dispersing the spinning finish components (such as synthetic esters and siloxanes) and avoiding stratification; can adjust viscosity and adapt to the process. Adding 5-15% deionized water can reduce the viscosity to 50-200 mPa·s, adapting to the contact-type oiling roller or atomized spraying process. Example 1

[0017] A special spinning finish for PEEK fine denier monofilament, comprising the following components by mass percentage: 40% smoothing agent, the smoothing agent is composed of pentaerythritol tetraoctanoate and polyether-modified silicone in a mass ratio of 3:1; the molecular weight of the polyether-modified silicone in the smoothing agent is 2000-5000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (2-5):1; 8% composite antistatic agent, the composite antistatic agent is composed of sodium dodecylbenzenesulfonate and potassium monolauryl phosphate (CAS 39322-78-6) in a mass ratio of 1:1.5; 25% composite emulsifier, the composite emulsifier is composed of fatty alcohol polyoxyethylene ether (AEO-9) and castor oil polyoxyethylene ether (EL-40) in a mass ratio of 2:1; 8% high-temperature resistant additive, the high-temperature resistant additive is tricresyl phosphate; 3% bundling agent, the bundling agent is dodecyl polyoxyethylene ether; 2% fiber separating agent, the fiber separating agent is polyether-modified silicone, and the molecular weight of the polyether-modified silicone in the fiber separating agent is 1000-3000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (1-3):1; 4% functional additive, which is a mixture of antioxidant 1010 and nano-silica with a particle size ≤50 nm in a mass ratio of 2:1; 10% deionized water. Example 2

[0018] A special spinning finish for PEEK fine denier monofilament, comprising the following components by mass percentage: 65% of a smoothing agent, the smoothing agent being composed of trimethylolpropane trioleate and polyether-modified silicone in a mass ratio of 5:1; the molecular weight of the polyether-modified silicone in the smoothing agent is 2000 - 5000, and the molar ratio of ethylene oxide to propylene oxide in the polyether segment is (2 - 5):1; 4% of a composite antistatic agent, the composite antistatic agent being composed of sodium dodecylbenzenesulfonate and potassium monolauryl phosphate (CAS 39322 - 78 - 6) in a mass ratio of 1:2; 18% of a composite emulsifier, the composite emulsifier being composed of fatty alcohol polyoxyethylene ether (AEO - 9) and castor oil polyoxyethylene ether (EL - 40) in a mass ratio of 3:1; 4% of a high - temperature resistant additive, the high - temperature resistant additive being tricresyl phosphate; 1% of a bundling agent, the bundling agent being dodecyl polyoxyethylene ether; 0.5% of a fiber - separating agent, the fiber - separating agent being polyether - modified silicone, the molecular weight of the polyether - modified silicone in the fiber - separating agent is 1000 - 3000, and the molar ratio of ethylene oxide to propylene oxide in the polyether segment is (1 - 3):1; 2% of a functional additive, being composed of antioxidant 1076 and nano - silica with a particle size ≤ 50nm in a mass ratio of 1:1; 5.5% of deionized water. Example 3

[0019] A special spinning finish for PEEK fine denier monofilament, comprising the following components by mass percentage: 35% of a smoothing agent, the smoothing agent being composed of pentaerythritol tetra - octanoate and polyether - modified silicone in a mass ratio of 2:1; the molecular weight of the polyether - modified silicone in the smoothing agent is 2000 - 5000, and the molar ratio of ethylene oxide to propylene oxide in the polyether segment is (2 - 5):1; 12% of a composite antistatic agent, the composite antistatic agent being composed of sodium dodecylbenzenesulfonate and potassium monolauryl phosphate (CAS 39322 - 78 - 6) in a mass ratio of 1:1; 35% of a composite emulsifier, the composite emulsifier being composed of fatty alcohol polyoxyethylene ether (AEO - 9) and castor oil polyoxyethylene ether (EL - 40) in a mass ratio of 1:1; 5% of a high - temperature resistant additive, the high - temperature resistant additive being tricresyl phosphate; 3% of a bundling agent, the bundling agent being dodecyl polyoxyethylene ether; 2% of a fiber - separating agent, the fiber - separating agent being polyether - modified silicone, the molecular weight of the polyether - modified silicone in the fiber - separating agent is 1000 - 3000, and the molar ratio of ethylene oxide to propylene oxide in the polyether segment is (1 - 3):1; The functional additive is 3%, which is a mixture of antioxidant 1010 and nano-silica with a particle size of ≤50 nm in a mass ratio of 3:1; Deionized water is 5%. Example 4

[0020] A special spinning oil for PEEK fine denier monofilament, comprising the following components by mass percentage: The smoothing agent is 35%, and the smoothing agent is a mixture of a heat-resistant synthetic ester and a polyether-modified silicone in a mass ratio of 2:1; among them, the heat-resistant synthetic ester is pentaerythritol tetraoctanoate or trimethylolpropane trioleate; the molecular weight of the polyether-modified silicone in the smoothing agent is 2000 - 5000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (2 - 5):1; The composite antistatic agent is 4%, and the composite antistatic agent is a mixture of an alkyl sulfonate and a potassium alkyl phosphate in a mass ratio of 1:2; among them, the alkyl sulfonate is sodium dodecylbenzenesulfonate, and the potassium alkyl phosphate is potassium monolauryl phosphate (CAS 39322 - 78 - 6); The composite emulsifier is 18%, and the composite emulsifier is a mixture of fatty alcohol polyoxyethylene ether (AEO - 9) and castor oil polyoxyethylene ether (EL - 40) in a mass ratio of 3:1; The high-temperature resistant additive is 12%, and the high-temperature resistant additive is tricresyl phosphate; The bundling agent is 6%, and the bundling agent is dodecyl polyoxyethylene ether; The fiber separating agent is 4%, and the fiber separating agent is a polyether-modified silicone. The molecular weight of the polyether-modified silicone in the fiber separating agent is 1000 - 3000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (1 - 3):1; The functional additive is 6%, which is a mixture of antioxidant 1076 and nano-silica with a particle size of ≤50 nm in a mass ratio of 2:1; Deionized water is 15%.

[0021] To better explain the present invention, the performances of the 4 examples in the specification and the traditional oil agent are compared in tabular form as shown in Table 1 below:

[0022] It can be seen from the above table that: (1) The smoothing agent of the present invention is a compound of high-temperature resistant synthetic ester + polyether silicone, which is stably lubricated above 320°C. The traditional oil agent decomposes above 200°C. Compared with the traditional oil agent, the present invention has excellent high-temperature resistance; (2) The antistatic agent of the present invention is a compound of double anions, and the antistatic effect is improved by 30%. The high-temperature static voltage ≤ 500V, while the traditional oil agent ≥ 1500V. Compared with the traditional oil agent, the present invention has a long-lasting antistatic effect and excellent antistatic performance; (3) The emulsifier of the present invention stabilizes the O / W emulsion (particle size 1-5μm), and it does not delaminate after 48 hours of heat stability at 120°C. The traditional oil agent delaminates only after 2 hours at 120°C. Compared with the traditional oil agent, the present invention has strong emulsion stability, and the stability is increased by more than 2 times, which is suitable for long-term industrial storage and high-temperature spinning environment; (4) The tricresyl phosphate of the present invention increases the glass transition temperature (Tg≥150°C), while the traditional oil agent has Tg<100°C and serious migration of high-temperature components. Compared with the traditional oil agent, the present invention has excellent high-temperature resistance; (5) The bundling index CI of the present invention is in the ideal processing range of 65-75, the fiber cohesion is moderate, and it is easy to separate filaments during post-processing; the fiber splitting index DI of the present invention is also in the ideal processing range of 30-40, the fiber splitting force is uniform, avoiding single-filament breakage or adhesion. For the traditional oil agent, CI>80 or DI<20, and the traditional oil agent has excessive or insufficient fiber splitting; (6) The present invention has both antioxidant and surface enhancement functions, and the storage period is extended to 12 months. Nano-SiO2 increases the fiber hardness HV≥50, while the performance of the traditional oil agent decays by more than 30% after 6 months of storage; (7) The weight loss rate of the present invention is reduced by 67% compared with the traditional oil agent, and the retention rate of active ingredients at high temperature is increased by more than 3 times; (8) The present invention has a long-lasting antistatic effect, and the static voltage on the fiber surface during the spinning process ≤ 500V. There is no winding or dust adsorption during high-speed spinning (≥3000m / min). Compared with the traditional oil agent, the static voltage of the present invention is reduced by 70%, effectively solving the production problems caused by static electricity; (9) Compared with the traditional oil agent, the breakage rate of the present invention is reduced by more than 40% on average, significantly improving the spinning continuity and production efficiency.

[0023] The advantages of the present invention are as follows: (1) By designing a composite system (such as heat-resistant synthetic ester + polyether silicone, double-anion antistatic agent, nano-enhanced functional additive) and precise proportioning (such as the compounding ratio of smoothing agent, antistatic agent, composite emulsifier, and functional additive, etc.), the problems of poor high-temperature resistance, insufficient antistatic property, weak emulsion stability, and functional imbalance of traditional oil agents are systematically solved; (2) Excellent high-temperature resistance: Through the 350°C thermogravimetric test, the mass loss within 1 hour is ≤5%, which is significantly better than that of commercially available traditional oil agents (the weight loss rate of traditional oil agents ≥15%); (3) Long-lasting antistatic effect: During the spinning process, the surface static voltage of the fiber is ≤500V, which is 70% lower than that of traditional oil agents, effectively solving the production problems caused by static electricity; (4) Strong emulsion stability: There is no delamination after storing at room temperature for 6 months and accelerating aging at 50°C for 2 months, meeting the long-term storage requirements of industrialization; (5) Optimized processing performance: The fiber bundling index (CI) is 65 - 75, and the fiber splitting index (DI) is 30 - 40, which is in the ideal processing range, and the broken-end rate is reduced by more than 40% compared with the prior art; (6) Diversified functions: It has both antioxidant and surface enhancement functions, improving the adaptability of post-processing of fibers.

[0024] The above are only the preferred embodiments of the present invention, and do not limit the present invention in any other form. Any modification or equivalent change made according to the technical essence of the present invention still belongs to the scope protected by the present invention.

Claims

1. A special spinning finish for PEEK fine denier monofilament, characterized in that: It comprises the following components by mass percentage: Smoothing agent 35 - 65%, and the smoothing agent is formed by mixing a heat-resistant synthetic ester and a polyether-modified siloxane in a mass ratio of (2 - 5):1; Compound antistatic agent 4 - 12%, and the compound antistatic agent is formed by mixing an alkyl sulfonate and a potassium alkyl phosphate in a mass ratio of 1:(1 - 2); Compound emulsifier 18 - 35%, and the compound emulsifier is formed by mixing a fatty alcohol polyoxyethylene ether and a castor oil polyoxyethylene ether in a mass ratio of (1 - 3):1; High-temperature resistant additive 4 - 12%, and the high-temperature resistant additive is tricresyl phosphate; Bundling agent 1 - 6%, and the bundling agent is a polyoxyethylene ether compound; Fiber separating agent 0.5 - 4%, and the fiber separating agent is a siloxane derivative; Functional additive 2 - 6%, which is formed by mixing a hindered phenol antioxidant and nano-silica with a particle size ≤ 50nm in a mass ratio of (1 - 3):1; Deionized water 5 - 15%.

2. The spinning finish for PEEK fine denier monofilament according to claim 1, characterized in that: The heat-resistant synthetic ester is pentaerythritol tetraoctanoate or trimethylolpropane trioleate.

3. The special spinning finish for PEEK fine denier monofilament according to claim 1, characterized in that: The molecular weight of the polyether-modified siloxane in the smoothing agent is 2000 - 5000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (2 - 5):

1.

4. The spinning finish for PEEK fine denier monofilament according to claim 1, characterized in that: In the compound antistatic agent, the alkyl sulfonate is sodium dodecylbenzenesulfonate, and the potassium alkyl phosphate is potassium monolauryl phosphate.

5. A special spinning finish for PEEK fine denier monofilament according to claim 1, characterized in that: The bundling agent is dodecyl polyoxyethylene ether.

6. The special spinning finish for PEEK fine denier monofilament according to claim 1, characterized in that: The fiber separating agent is a polyether-modified siloxane, the molecular weight of the polyether-modified siloxane is 1000 - 3000, and the molar ratio of ethylene oxide to propylene oxide in the polyether chain segment is (1 - 3):

1.

7. A special spinning finish for PEEK fine denier monofilament according to claim 1, characterized in that: The hindered phenol antioxidant is one or more of antioxidant 1010 and antioxidant 1076.

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