Smooth agent for polyester fdy spinning oil

Abstract

The present application belongs to the technical field of polyester oil agent, and particularly relates to a smoothing agent for polyester FDY spinning oil agent. The smoothing agent for polyester FDY spinning oil agent comprises the following components in parts by weight: 20-30 parts of fatty acid ester; 15-20 parts of polyether modified oleic acid; and 10-15 parts of modified amino silicone oil. The smoothing agent provided by the present application comprises the components of fatty acid ester, polyether modified oleic acid and modified amino silicone oil, the polyether modified oleic acid and the modified amino silicone oil help to improve the comprehensive performance of the smoothing agent, endow the smoothing agent with excellent smoothness, wettability and high-temperature resistance, and are used in the polyester FDY oil agent, have high oil film strength, can also improve the antistatic performance and the flame retardant performance of the oil agent, and are suitable for being specially used in flame-retardant polyester fully drawn yarn oil agent.

Description

Technical Field

[0001] This invention belongs to the field of polyester oiling technology, specifically relating to a smoothing agent for polyester FDY spinning. Background Technology

[0002] Polyester is a synthetic fiber made from polyethylene terephthalate (PET) or its copolymers through spinning and post-processing. Based on its production method, it can be divided into: virgin yarn (undrawn yarn UDY, semi-pre-oriented yarn MOY, pre-oriented yarn POY, highly oriented yarn HOY), drawn yarn (drawn yarn DY, fully drawn yarn FDY, fully undrawn yarn FOY), and textured yarn (conventional textured yarn TY, drawn textured yarn DTY, air-textured yarn ATY). Among these, fully drawn polyester yarn has a huge annual production volume and is widely used in home textiles, clothing, engineering, and other fields. To improve the poor moisture absorption, poor conductivity, and high coefficient of friction of polyester fibers, oiling agents are used during the polyester spinning process. These agents form an oriented adsorption layer (oil film) on the fiber surface, reducing the coefficient of friction between the fiber and equipment, and between fibers themselves. They also prevent static electricity accumulation, improve bundle cohesion and smoothness, thereby ensuring the smooth completion of spinning, winding, and drawing processes.

[0003] Polyester spinning oil typically comprises smoothing agents, emulsifiers, wetting agents, bridging agents, and antistatic agents. Among these, the smoothing agent is a crucial component, its performance directly impacting the oil's effectiveness. Common smoothing agents include mineral oils, natural esters, synthetic esters, and polyethers. While mineral oils offer good smoothness at low temperatures, they suffer from poor heat resistance, high volatility at high temperatures, and weak oil film strength. Natural esters offer good smoothness, low smoke emission, and high oil film strength, but are prone to oxidation. Synthetic esters come in various types, exhibiting good thermal stability, smoothness, and abrasion resistance. Polyethers possess good thermal stability and exhibit certain wetting and bridging properties. Mineral oil, natural esters, synthetic esters, and polyethers are typically compounded to improve the performance of smoothing agents. Compared to single-type smoothing agents, compounded smoothing agents offer significantly improved smoothness and are suitable for different types of polyester spinning oils. Due to the high speed and friction of the high-speed polyester FDY spinning process, the temperature during stretching deformation can reach around 200°C, requiring smoothing agents with excellent high-temperature resistance. However, most existing synthetic ester and polyether smoothing agents lack sufficient high-temperature resistance and cannot meet the requirements of the polyester FDY spinning process. Therefore, a high-temperature resistant smoothing agent specifically designed for polyester FDY spinning is needed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a smoothing agent for polyester FDY spinning oil, comprising fatty acid esters, polyether-modified oleic acid, and modified amino silicone oil components. The polyether-modified oleic acid and modified amino silicone oil help improve the overall performance of the smoothing agent, giving it excellent smoothness, wettability, and high-temperature resistance. When used in polyester FDY oil, it produces a high oil film strength and can also improve the antistatic and flame-retardant properties of the oil, making it suitable for use in flame-retardant polyester fully drawn yarn oil.

[0005] The technical solution adopted by the present invention to achieve the above objectives is as follows:

[0006] A smoothing agent for polyester FDY spinning oil, the smoothing agent comprising the following components in parts by weight: 20-30 parts of fatty acid ester; 15-20 parts of polyether-modified oleic acid; and 10-15 parts of modified amino silicone oil;

[0007] Furthermore, the fatty acid ester is any one or a mixture of several of isooctyl oleate, glycerol monooleate, and pentaerythritol stearate.

[0008] Further, the preparation method of the polyether-modified oleic acid is as follows: polyethylene glycol monomethyl ether and sodium hydride are added to anhydrous tetrahydrofuran solution, stirred evenly, and under nitrogen protection, the reaction is carried out at a temperature of 40-50°C for 1-2 hours. Then, modified oleic acid is added, and the reaction is continued for 4-5 hours. After the reaction is completed, the insoluble matter is removed first, and then the anhydrous tetrahydrofuran solution is removed. The mixture is stirred and impurities are removed by n-hexane, filtered, and the product is washed and dried to obtain polyether-modified oleic acid.

[0009] Furthermore, the molar ratio of polyethylene glycol monomethyl ether, sodium hydride, and modified oleic acid is 1:1.3-1.5:1.2-1.3.

[0010] Furthermore, the modified amino silicone oil is prepared by adding amino silicone oil to an isopropanol solution, stirring until homogeneous, adding modified oleic acid and triethylamine, stirring and reacting at 60-70°C for 6-7 hours, removing the isopropanol solution after the reaction is complete, and drying to obtain the modified amino silicone oil.

[0011] Furthermore, the mass ratio of the amino silicone oil, modified oleic acid, and triethylamine is 1:0.1-0.2:0.04-0.05.

[0012] Furthermore, the method for preparing the modified oleic acid is as follows:

[0013] S1. Add oleic acid, sodium 3-chloro-2-hydroxypropanesulfonate and p-toluenesulfonic acid to the toluene solution, stir until homogeneous, reflux at 100-110℃ for 4-5 hours, and collect the water produced in the reaction. After the reaction is complete, remove the toluene solution, stir and remove impurities by passing through diethyl ether, filter, and wash and dry the product to obtain sodium oleic acid-sulfonate.

[0014] S2. Add sodium oleic acid sulfonate and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to the N,N-dimethylformamide solution, stir until homogeneous, and react at 90-95℃ for 8-9 hours. After the reaction is complete, remove the N,N-dimethylformamide solution, remove impurities by stirring with diethyl ether, filter, and wash and dry the product to obtain modified oleic acid.

[0015] Further, in step S1, the molar ratio of oleic acid, sodium 3-chloro-2-hydroxypropanesulfonate, and p-toluenesulfonic acid is 1:1.1-1.2:0.01-0.02.

[0016] Furthermore, in step S2, the molar ratio of sodium oleate-sulfonate and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:1.1-1.2.

[0017] The present invention also provides a method for preparing a smoothing agent for polyester FDY spinning oil, comprising the following steps: adding fatty acid ester, polyether modified oleic acid and modified amino silicone oil into a reaction vessel according to the weight ratio, stirring at 50-60°C for 1-2 hours, and cooling to room temperature to obtain a smoothing agent for polyester FDY spinning oil.

[0018] The present invention has the following beneficial effects:

[0019] This invention uses oleic acid as a modifying raw material, reacting it sequentially with sodium 3-chloro-2-hydroxypropanesulfonate and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) to obtain modified oleic acid containing oleate groups, DOPO groups, and sodium propanesulfonate groups. This invention also prepares modified amino silicone oil by reacting the amino group in the amino silicone oil structure with the chlorine atom in the modified oleic acid molecule, and further prepares polyether-modified oleic acid by reacting the hydroxyl group in the polyethylene glycol monomethyl ether structure with the chlorine atom in the modified oleic acid molecule. Both the polyether-modified oleic acid and the modified amino silicone oil prepared by this invention have modified oleic acid molecules grafted onto their structures, namely oleate groups and DOPO groups. The presence of sodium propyl sulfonate groups, including oleate groups and polyethylene glycol monomethyl ether structures in polyether-modified oleic acid, gives it excellent surface activity. The oleate groups have good lubricity and work synergistically with the amino silicone oil structure in modified amino silicone oil to greatly improve the smoothness of the lubricant and reduce the coefficient of friction. Sodium propyl sulfonate groups reduce static electricity accumulation and work synergistically with antistatic agents in the oil to further enhance the antistatic properties of the oil. The rigid ring structure and strong flame retardant effect of the DOPO groups improve the heat resistance of polyether-modified oleic acid and modified amino silicone oil, thereby synergistically improving the high-temperature resistance and flame retardant properties of the oil and enhancing the oil film strength.

[0020] The smoothing agent provided by this invention includes fatty acid esters, polyether-modified oleic acid, and modified amino silicone oil components. The polyether-modified oleic acid and modified amino silicone oil help improve the overall performance of the smoothing agent, giving it excellent smoothness, wettability, and high-temperature resistance. When used in polyester FDY oiling agents, it produces high oil film strength and can also improve the antistatic and flame-retardant properties of the oiling agent. It is suitable for use in flame-retardant polyester fully drawn yarn oiling agents. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the technical solution of this invention, all chemical reagents used are commercially available, including: amino silicone oil (CAS number 63148-62-0, 800 mPa·s, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.); polyethylene glycol monomethyl ether (CAS number 9004-74-4, Mn=750); sodium hydride (CAS number 7646-69-7); triethylamine (CAS number 121-44-8); oleic acid (CAS number 112-80-1); and sodium 3-chloro-2-hydroxypropanesulfonate (CAS number 12). 6-83-0; p-Toluenesulfonic acid CAS number 104-15-4; 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) CAS number 35948-25-5; Toluene CAS number 108-88-3; Diethyl ether CAS number 60-29-7; N,N-Dimethylformamide CAS number 68-12-2; Tetrahydrofuran CAS number 109-99-9; n-Hexane CAS number 110-54-3; Isopropanol CAS number 67-63-0.

[0023] Example 1

[0024] This embodiment provides a method for preparing modified oleic acid, specifically including:

[0025] S1. Add 30.0 g oleic acid, 23.1 g sodium 3-chloro-2-hydroxypropanesulfonate, and 0.3 g p-toluenesulfonic acid to 500 mL of toluene solution. Stir until homogeneous, reflux at 110 °C for 5 h, and collect the water produced in the reaction. After the reaction is complete, remove the toluene solution, remove impurities by stirring with diethyl ether, filter, and wash and dry the product to obtain 41.5 g of oleic acid-sulfonate sodium; wherein the molar ratio of oleic acid, sodium 3-chloro-2-hydroxypropanesulfonate, and p-toluenesulfonic acid is 1:1.1:0.02; the reaction process is as follows: ;

[0026] Sodium oleate sulfonate: ESI (m / z): 462.0 [M+H] + , 1 H-NMR (600MHz, DMSO-d6, δppm): 5.18-5.30 (m, 3H), 3.40-3.53 (m, 4H), 2.16-2.29 (m, 6H), 1.26-1.38 (m, 22H), 0.88 (t, J=6.8Hz, 3H);

[0027] S2. Add 40.0 g of sodium oleate and 20.6 g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) to 450 mL of N,N-dimethylformamide solution. Stir until homogeneous and react at 95 °C for 8 h. After the reaction is complete, remove the N,N-dimethylformamide solution, remove impurities by stirring with diethyl ether, filter, and wash and dry the product to obtain 48.6 g of modified oleic acid. The molar ratio of sodium oleate to 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:1.1. The reaction process is as follows: ;

[0028] Modified oleic acid: ESI (m / z): 678.2 [M+H] + , 1 H-NMR (600MHz, DMSO-d6, δppm): 7.75-8.00 (m, 2H), 7.41-7.50 (m, 4H), 7.29-7.36 (m, 2H), 5.00-5.08 (m, 1H), 3.39 -3.46 (m, 3H), 3.30-3.36 (m, 2H), 2.29-2.33 (m, 2H), 1.68-1.75 (m, 6H), 1.25-1.33 (m, 22H), 0.89 (t, J=6.9Hz, 3H).

[0029] Example 2

[0030] This embodiment provides a smoothing agent for polyester FDY spinning oil, comprising the following components by weight: 30 parts of fatty acid ester; 20 parts of polyether-modified oleic acid; and 15 parts of modified amino silicone oil; wherein the fatty acid ester is isooctyl oleate.

[0031] The preparation method of polyether-modified oleic acid is as follows: polyethylene glycol monomethyl ether and sodium hydride are added to anhydrous tetrahydrofuran solution and stirred evenly. Under nitrogen protection, the mixture is stirred and reacted at 50°C for 1.5 h. Then, modified oleic acid is added and the reaction is continued for 5 h. After the reaction is completed, insoluble matter is removed first, and then the anhydrous tetrahydrofuran solution is removed. The mixture is stirred and impurities are removed by n-hexane, filtered, and the product is washed and dried to obtain polyether-modified oleic acid. The molar ratio of polyethylene glycol monomethyl ether, sodium hydride and modified oleic acid is 1:1.5:1.3.

[0032] The modified amino silicone oil is prepared by adding amino silicone oil to an isopropanol solution, stirring until homogeneous, adding modified oleic acid and triethylamine, stirring and reacting at 65°C for 7 hours, removing the isopropanol solution after the reaction is complete, and drying to obtain the modified amino silicone oil; wherein the mass ratio of amino silicone oil, modified oleic acid and triethylamine is 1:0.2:0.05.

[0033] A method for preparing a smoothing agent for polyester FDY spinning oil includes the following steps: according to the weight ratio, fatty acid ester, polyether modified oleic acid and modified amino silicone oil are added to a reaction vessel, stirred at 60°C for 1 hour, and cooled to room temperature to obtain a smoothing agent for polyester FDY spinning oil.

[0034] Example 3

[0035] This embodiment provides a smoothing agent for polyester FDY spinning oil, comprising the following components by weight: 20 parts of fatty acid ester; 17 parts of polyether-modified oleic acid; and 10 parts of modified amino silicone oil; wherein the fatty acid ester is pentaerythritol stearate.

[0036] The preparation method of polyether-modified oleic acid is as follows: polyethylene glycol monomethyl ether and sodium hydride are added to anhydrous tetrahydrofuran solution and stirred evenly. Under nitrogen protection, the mixture is stirred and reacted at 40°C for 2 hours. Then, modified oleic acid is added and the reaction is continued for 4.5 hours. After the reaction is completed, insoluble matter is removed first, and then the anhydrous tetrahydrofuran solution is removed. The mixture is stirred and impurities are removed by n-hexane, filtered, and the product is washed and dried to obtain polyether-modified oleic acid. The molar ratio of polyethylene glycol monomethyl ether, sodium hydride and modified oleic acid is 1:1.3:1.2.

[0037] The modified amino silicone oil is prepared by adding amino silicone oil to an isopropanol solution, stirring until homogeneous, adding modified oleic acid and triethylamine, stirring and reacting at 70°C for 6 hours, removing the isopropanol solution after the reaction is complete, and drying to obtain the modified amino silicone oil; wherein the mass ratio of amino silicone oil, modified oleic acid and triethylamine is 1:0.1:0.04.

[0038] A method for preparing a smoothing agent for polyester FDY spinning oil includes the following steps: according to the weight ratio, fatty acid ester, polyether modified oleic acid and modified amino silicone oil are added to a reaction vessel, stirred at 50°C for 2 hours, and cooled to room temperature to obtain a smoothing agent for polyester FDY spinning oil.

[0039] Example 4

[0040] This embodiment provides a smoothing agent for polyester FDY spinning oil, comprising the following components by weight: 25 parts fatty acid ester; 15 parts polyether-modified oleic acid; and 12 parts modified amino silicone oil; wherein the fatty acid ester is glycerol monooleate.

[0041] The preparation method of polyether-modified oleic acid is as follows: polyethylene glycol monomethyl ether and sodium hydride are added to anhydrous tetrahydrofuran solution and stirred evenly. Under nitrogen protection, the mixture is stirred and reacted at 45°C for 1 hour. Then, modified oleic acid is added and the reaction is continued for 4 hours. After the reaction is completed, insoluble matter is removed first, and then the anhydrous tetrahydrofuran solution is removed. The mixture is stirred and impurities are removed by n-hexane, filtered, and the product is washed and dried to obtain polyether-modified oleic acid. The molar ratio of polyethylene glycol monomethyl ether, sodium hydride and modified oleic acid is 1:1.4:1.25.

[0042] The modified amino silicone oil is prepared by adding amino silicone oil to an isopropanol solution, stirring until homogeneous, adding modified oleic acid and triethylamine, stirring and reacting at 60°C for 6.5 h, removing the isopropanol solution after the reaction is complete, and drying to obtain the modified amino silicone oil; wherein the mass ratio of amino silicone oil, modified oleic acid and triethylamine is 1:0.15:0.045.

[0043] A method for preparing a smoothing agent for polyester FDY spinning oil includes the following steps: according to the weight ratio, fatty acid ester, polyether modified oleic acid and modified amino silicone oil are added to a reaction vessel, stirred at 55°C for 1.5 h, and cooled to room temperature to obtain a smoothing agent for polyester FDY spinning oil.

[0044] Example 5

[0045] This embodiment provides a smoothing agent for polyester FDY spinning oil, comprising the following components by weight: 28 parts of fatty acid ester; 16 parts of polyether-modified oleic acid; and 15 parts of modified amino silicone oil; wherein the fatty acid ester is isooctyl oleate.

[0046] The preparation method of polyether-modified oleic acid is as follows: polyethylene glycol monomethyl ether and sodium hydride are added to anhydrous tetrahydrofuran solution and stirred evenly. Under nitrogen protection, the mixture is stirred and reacted at 45°C for 2 hours. Then, modified oleic acid is added and the reaction is continued for 5 hours. After the reaction is completed, insoluble matter is removed first, and then the anhydrous tetrahydrofuran solution is removed. The mixture is stirred and impurities are removed by n-hexane, filtered, and the product is washed and dried to obtain polyether-modified oleic acid. The molar ratio of polyethylene glycol monomethyl ether, sodium hydride and modified oleic acid is 1:1.4:1.3.

[0047] The modified amino silicone oil is prepared by adding amino silicone oil to an isopropanol solution, stirring until homogeneous, adding modified oleic acid and triethylamine, stirring and reacting at 70°C for 6.5 h, removing the isopropanol solution after the reaction is complete, and drying to obtain the modified amino silicone oil; wherein the mass ratio of amino silicone oil, modified oleic acid and triethylamine is 1:0.1:0.045.

[0048] A method for preparing a smoothing agent for polyester FDY spinning oil includes the following steps: according to the weight ratio, fatty acid ester, polyether modified oleic acid and modified amino silicone oil are added to a reaction vessel, stirred at 60°C for 2 hours, and cooled to room temperature to obtain a smoothing agent for polyester FDY spinning oil.

[0049] Comparative Example 1

[0050] This comparative example differs from Example 2 in that the components of the smoothing agent are different.

[0051] This comparative example provides a smoothing agent for polyester FDY spinning oil, comprising the following components in parts by weight: 30 parts of fatty acid ester; 20 parts of polyethylene glycol monomethyl ether; and 15 parts of modified amino silicone oil; wherein the fatty acid ester is isooctyl oleate.

[0052] The modified amino silicone oil is prepared by adding amino silicone oil to an isopropanol solution, stirring until homogeneous, adding modified oleic acid and triethylamine, stirring and reacting at 65°C for 7 hours, removing the isopropanol solution after the reaction is complete, and drying to obtain the modified amino silicone oil; wherein the mass ratio of amino silicone oil, modified oleic acid and triethylamine is 1:0.2:0.05.

[0053] A method for preparing a smoothing agent for polyester FDY spinning oil includes the following steps: according to the weight ratio, fatty acid ester, polyethylene glycol monomethyl ether and modified amino silicone oil are added to a reaction vessel, stirred at 60°C for 1 hour, and cooled to room temperature to obtain a smoothing agent for polyester FDY spinning oil.

[0054] Comparative Example 2

[0055] This comparative example differs from Example 2 in that the components of the smoothing agent are different.

[0056] This comparative example provides a smoothing agent for polyester FDY spinning oil, comprising the following components in parts by weight: 30 parts of fatty acid ester; 20 parts of polyether-modified oleic acid; and 15 parts of amino silicone oil; wherein the fatty acid ester is isooctyl oleate.

[0057] The preparation method of polyether-modified oleic acid is as follows: polyethylene glycol monomethyl ether and sodium hydride are added to anhydrous tetrahydrofuran solution and stirred evenly. Under nitrogen protection, the mixture is stirred and reacted at 50°C for 1.5 h. Then, modified oleic acid is added and the reaction is continued for 5 h. After the reaction is completed, insoluble matter is removed first, and then the anhydrous tetrahydrofuran solution is removed. The mixture is stirred and impurities are removed by n-hexane, filtered, and the product is washed and dried to obtain polyether-modified oleic acid. The molar ratio of polyethylene glycol monomethyl ether, sodium hydride and modified oleic acid is 1:1.5:1.3.

[0058] A method for preparing a smoothing agent for polyester FDY spinning oil includes the following steps: according to the weight ratio, fatty acid ester, polyether modified oleic acid and amino silicone oil are added to a reaction vessel, stirred at 60°C for 1 hour, and cooled to room temperature to obtain a smoothing agent for polyester FDY spinning oil.

[0059] Comparative Example 3

[0060] This comparative example differs from Example 2 in that the components of the smoothing agent are different.

[0061] This comparative example provides a smoothing agent for polyester FDY spinning oil, comprising the following components in parts by weight: 30 parts of fatty acid ester; 20 parts of polyethylene glycol monomethyl ether; and 15 parts of amino silicone oil; wherein the fatty acid ester is isooctyl oleate.

[0062] A method for preparing a smoothing agent for polyester FDY spinning oil includes the following steps: according to the weight ratio, fatty acid ester, polyethylene glycol monomethyl ether and amino silicone oil are added to a reaction vessel, stirred at 60°C for 1 hour, and cooled to room temperature to obtain a smoothing agent for polyester FDY spinning oil.

[0063] Test case

[0064] The smoothing agents obtained in Examples 2 to 5 and Comparative Examples 1 to 3 were formulated into polyester FDY spinning oils. The formulations were as follows: 50 parts by weight of smoothing agent; 15 parts by weight of emulsifier (nonylphenol polyoxyethylene ether); 10 parts by weight of antistatic agent (sodium lauryl succinate monoester sulfonate); 8 parts by weight of bundle agent (cocoyl oleate diethanolamide); 0.5 parts by weight of antioxidant (antioxidant 330); and 15 parts by weight of water. These were then formulated into an emulsion (15% aq). The emulsion was used for 15 days under the same spinning conditions at a spinning speed of 4500 m / min, a fiber specification of 150D / 96f, and a GR2 temperature of 130℃. The spinning effect was observed. Surface tension was tested according to GB / T 22237-2008 standard. Wetting speed was tested using the canvas settling method (15% aq emulsion). (aq), temperature 30℃; tested oil application rate, dynamic friction coefficient, and resistivity (equilibrated for 24h at 20℃ and 65% relative humidity); oil film strength test according to GB / T3142 standard; flame retardancy test according to GB / T 2406-2009 standard; test results are shown in Table 1 below.

[0065] Table 1 Test Results

[0066]

[0067] As shown in Table 1, the smoothing agents prepared in Examples 2 to 5 of this invention, when used in polyester FDY spinning oil, have advantages such as low surface tension, fast wetting speed, high oiling rate, small dynamic friction coefficient, small resistivity, high oil film strength, and high limiting oxygen index. During spinning, there are no fuzzy fibers or broken ends, and almost no smoke or coking on the heater. This indicates that the smoothing agent prepared in this invention has excellent smoothness, wettability, high temperature resistance, and high oil film strength. It can also improve the antistatic and flame-retardant properties of the oil, making it suitable for use as a special oil for flame-retardant fully drawn polyester yarn. Compared with Comparative Examples 1 to 3, the smoothing agent in Example 2 of this invention includes polyether-modified oleic acid and modified amino silicone oil. The modified oleic acid molecules contained in both can work synergistically to improve the smoothness, dispersibility, antistatic properties, high temperature resistance, and flame-retardant properties of the smoothing agent.

[0068] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0069] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lubricant for polyester FDY spinning oil, characterized in that, The smoothing agent comprises the following components in parts by weight: 20-30 parts fatty acid ester; 15-20 parts polyether-modified oleic acid; and 10-15 parts modified amino silicone oil. The preparation method of the polyether modified oleic acid is as follows: polyethylene glycol monomethyl ether and sodium hydride are added to anhydrous tetrahydrofuran solution and stirred evenly. Under nitrogen protection, the reaction is carried out at a temperature of 40-50°C for 1-2 hours. Then, modified oleic acid is added and the reaction is continued for 4-5 hours. After the reaction is completed, the insoluble matter is removed first, and then the anhydrous tetrahydrofuran solution is removed. The product is stirred and impurities are removed by n-hexane, filtered, and the product is washed and dried to obtain polyether modified oleic acid. The modified amino silicone oil is prepared by adding amino silicone oil to an isopropanol solution, stirring until uniform, adding modified oleic acid and triethylamine, stirring and reacting at 60-70℃ for 6-7 hours, removing the isopropanol solution after the reaction is complete, and drying to obtain the modified amino silicone oil. The method for preparing the modified oleic acid is as follows: S1. Add oleic acid, sodium 3-chloro-2-hydroxypropanesulfonate and p-toluenesulfonic acid to the toluene solution, stir until homogeneous, reflux at 100-110℃ for 4-5 hours, and collect the water produced in the reaction. After the reaction is complete, remove the toluene solution, stir and remove impurities by passing through diethyl ether, filter, and wash and dry the product to obtain sodium oleic acid-sulfonate. S2. Add sodium oleic acid sulfonate and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to the N,N-dimethylformamide solution, stir until homogeneous, and react at 90-95℃ for 8-9 hours. After the reaction is complete, remove the N,N-dimethylformamide solution, remove impurities by stirring with diethyl ether, filter, and wash and dry the product to obtain modified oleic acid.

2. The lubricant for polyester FDY spinning oil according to claim 1, characterized in that, The mass ratio of amino silicone oil, modified oleic acid, and triethylamine is 1:0.1-0.2:0.04-0.

05.

3. The lubricant for polyester FDY spinning oil according to claim 1, characterized in that, The molar ratio of polyethylene glycol monomethyl ether, sodium hydride, and modified oleic acid is 1:1.3-1.5:1.2-1.

3.

4. The lubricant for polyester FDY spinning oil according to claim 1, characterized in that, The molar ratio of oleic acid, sodium 3-chloro-2-hydroxypropanesulfonate, and p-toluenesulfonic acid in step S1 is 1:1.1-1.2:0.01-0.

02.

5. A smoothing agent for polyester FDY spinning oil according to claim 1, characterized in that, In step S2, the molar ratio of sodium oleate-sulfonate and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 1:1.1-1.

2.

6. The lubricant for polyester FDY spinning oil according to claim 1, characterized in that, The fatty acid ester is any one or a mixture of several of isooctyl oleate, glycerol monooleate, and pentaerythritol stearate.

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