A polyester oiling agent for high-speed spinning

Abstract

This invention belongs to the field of textile auxiliaries technology, and particularly relates to a high-speed spinning polyester oiling agent, comprising, by weight: 40-60 parts of a smoothing agent, 10-20 parts of an emulsifier, 5-20 parts of an antistatic agent, 5-10 parts of a bridging agent, and 5-15 parts of oil-containing lubricating particles. The oil-containing lubricating particles comprise a core suspension and a shell layer covering the outer side of the core suspension. The core suspension comprises an oily dispersion medium and inorganic nano-lubricating particles dispersed in the oily dispersion medium. The shell layer is a temperature-sensitive reversible cross-linked network structure. The high-speed spinning polyester oiling agent of this invention improves the oiling agent's anti-wear and friction-reducing properties, lubrication properties, stability, and anti-agglomeration ability by optimizing the addition method of nanoparticles.

Description

Technical Field

[0001] This invention belongs to the field of spinning auxiliaries technology, and particularly relates to a polyester oiling agent for high-speed spinning. Background Technology

[0002] Chemically synthesized fibers are high-molecular-weight compounds formed by the direct polymerization of compounds. During the spinning process, they generate friction and static electricity, thus requiring the use of auxiliaries to soften and smooth the fibers, as well as to eliminate static electricity buildup. These auxiliaries are collectively known as spinning oils. Spinning oils protect the fibers by forming an oil film on the fiber surface, giving the fibers a certain degree of smoothness, reducing or even completely eliminating fiber damage during friction, and providing a good hand feel. Polyester fibers possess advantages such as high strength, good abrasion resistance, strong wrinkle resistance, excellent dimensional stability, and good resistance to acids, alkalis, and other chemicals. They are widely used in clothing textiles, home decoration, industrial textiles, medical supplies, and emerging fields, and are currently the most widely used and largest-produced synthetic fiber globally, consistently ranking first in production volume and occupying a core position among synthetic fibers.

[0003] In recent years, with the advancement of textile technology, the operating speed of modern spinning equipment has increased significantly; for example, the spinning speed of polyester filament can reach over 5000 m / min. This requires oils to possess stronger penetrability, lubricity, bundling properties, anti-splashing ability, and heat resistance. Currently,

[0004] In the development of lubricants, although many existing technologies have shown that nanoparticles, with their layered or spherical structures, can form a ball bearing effect or a self-lubricating film on the surface of friction pairs, significantly reducing the coefficient of friction at the contact surfaces, and that nanoparticles can embed themselves into the worn surface during friction, filling micro-pits and polishing rough peaks to reduce surface roughness and the ploughing effect, thereby improving lubrication, their application in spinning lubricants is still in its early stages. The addition of nanoparticles to lubricants to achieve anti-wear and friction-reducing effects is relatively rare. The main reasons for this are as follows:

[0005] First, nanoparticles are generally non-lipophilic and have extremely high specific surface area and surface energy, making them prone to aggregation. In the emulsion system of spinning oils, nanoparticles have problems such as weak stability, poor compatibility with oily components, and easy aggregation. If nanoparticles cannot be uniformly dispersed, they will form large particles or agglomerates. These particles or agglomerates not only fail to exert the lubricating and friction-reducing effects of nanoparticles, but may also wear down the fiber surface, becoming a source of defects on the fiber surface and leading to fiber surface defects.

[0006] Secondly, the working environment of spinning oils differs significantly from other lubrication systems, making it difficult for nanoparticles to adhere to the fiber surface. Specifically, there are currently two main methods for applying spinning oils: nozzle application and roller application. Nozzle application involves spraying the oil directly onto the fiber bundle in a mist or fine stream through a nozzle, while roller application involves applying the oil to the fiber bundle using an oiling roller. During the oiling process, due to the small diameter of the fibers and the limited surface area for oil adhesion, coupled with the significant fiber deformation during subsequent spinning, it is difficult for the nanoparticles in the oil to adhere to the fiber surface. Even if they do adhere successfully, they are easily detached during the spinning process due to friction, stretching, and deformation. Therefore, the nanoparticles added to the oil often fail to effectively perform their lubricating and friction-reducing functions.

[0007] Third, the addition of nanoparticles can easily cause clogging of the oiling equipment. Because the oiling agent needs to be applied to the oil nozzle or oil wheel by dripping or spraying through the oiling nozzle, and the flow rate of the oiling agent applied to a single oil nozzle or oil wheel is very small, the cross-section of the oil nozzle or oiling nozzle is extremely small. During oiling, nanoparticles can easily cause clogging of the oiling equipment and interruption of the spinning process due to agglomeration or deposition.

[0008] In view of this, the present invention proposes a high-speed spinning polyester oiling agent that can effectively utilize the lubrication and friction reduction effects of nanoparticles by improving the method of adding nanoparticles. Summary of the Invention

[0009] The purpose of this invention is to address the aforementioned technical problems by providing a high-speed spinning polyester oil that can effectively improve the oiling effect by utilizing the lubrication and friction-reducing properties of nanoparticles.

[0010] In view of this, the present invention provides a high-speed spinning polyester oiling agent, comprising, by weight: 40-60 parts of a smoothing agent, 10-20 parts of an emulsifier, 5-20 parts of an antistatic agent, 5-10 parts of a bridging agent, and 5-15 parts of oil-containing lubricating particles, wherein the oil-containing lubricating particles comprise a core suspension and a shell layer covering the outer side of the core suspension, wherein the core suspension comprises an oily dispersion medium and inorganic nano-lubricating particles dispersed in the oily dispersion medium, and the shell layer is a temperature-sensitive reversible cross-linked network structure.

[0011] Furthermore, the shell layer is an amphiphilic, thermosensitive, reversible cross-linked network structure.

[0012] Furthermore, the shell layer includes: a cross-linked network;

[0013] The cross-linked network is a thermosensitive and reversible cross-linked network structure formed by reacting and cross-linking Pluronic-NHS with a water-soluble polymer containing hydroxyl groups.

[0014] Furthermore, star-shaped nodes are attached to the cross-linking network in the shell, and the star-shaped nodes are formed by inorganic nanoparticles attached to the cross-linking network.

[0015] Furthermore, the star-shaped nodes are inorganic nanoparticles attached to the Pronnicke-NHS and / or water-soluble polymer chains containing hydroxyl groups.

[0016] Furthermore, the star-shaped nodes are inorganic nanoparticles attached to the water-soluble polymer chain segments containing hydroxyl groups.

[0017] Furthermore, the smoothing agent is a mixture of mineral oil, synthetic fatty acid ester, and polyether, wherein the mass ratio of mineral oil, synthetic fatty acid ester, and polyether is (1~3):(3~5):(2~4).

[0018] Furthermore, the preparation process of the high-speed spinning polyester oiling agent is as follows:

[0019] S1, Pretreatment of inorganic nano-lubricating particles: First, the inorganic nano-lubricating particles are dispersed in a soluble calcium salt solution, then fatty acid salts are added dropwise. After reacting at room temperature and stirring for 10-30 minutes, the particles are separated and dried to obtain the pretreated inorganic nano-lubricating particles.

[0020] S2, Preparation of core suspension: Disperse the inorganic nano-lubricating particles pretreated in step S1 into an oily dispersion medium. After uniform dispersion, the core suspension is obtained.

[0021] S3, Preparation of oil-containing lubricating particles: The core suspension obtained in step S2 and Pluronic-NHS are dispersed in an organic solvent to obtain mixed system a. Water-soluble polymer, deionized water and emulsifier are mixed and stirred thoroughly to obtain mixed system b. Then, mixed system a is slowly added to mixed system b. After the addition is complete, the mixture is emulsified under ultrasonication at 5~18℃ for 10~20 min. After distillation to remove the organic solvent, a dispersion of oil-containing lubricating particles is obtained. The dispersion of oil-containing lubricating particles is then freeze-dried to obtain oil-containing lubricating particles.

[0022] S4, Preparation of the oil phase: According to the weight ratio of smoothing agent, emulsifier, antistatic agent and bridging agent in polyester oil, mix appropriate amounts of smoothing agent, emulsifier, antistatic agent and bridging agent, and stir evenly to obtain the oil phase;

[0023] S5, Preparation of high-speed spinning polyester oil: Take the oil-containing lubricating particles prepared in step S3 and disperse them into the oil phase prepared in step S4. First, stir at 5~15℃ for 20~30 min, then heat to 30~40℃ and stir for 5~10 min to obtain high-speed spinning polyester oil.

[0024] Furthermore, the mixed system b in step S3 also includes inorganic nanoparticles, the amount of which is 0.5 to 3 times the amount of water-soluble polymer. The preparation process of the mixed system b in step S3 is as follows:

[0025] The water-soluble polymer was dissolved in deionized water according to the weight ratio to prepare an aqueous solution. Then, the inorganic nanoparticles and emulsifier were dispersed into the aqueous solution of the water-soluble polymer and stirred until uniformly dispersed to obtain mixed system b.

[0026] or,

[0027] First, the water-soluble polymer is dissolved in 30-50 wt% of deionized water to prepare an aqueous solution. Then, the inorganic nanoparticles and emulsifier are dispersed into the aqueous solution of the water-soluble polymer and stirred until uniformly dispersed. Finally, the remaining deionized water is added and stirred until uniformly dispersed to obtain mixed system b.

[0028] Furthermore, the preparation process of the mixed system b in step S3 is as follows:

[0029] Dissolve 2-10 parts by weight of sodium silicate in 10-40 parts by weight of deionized water and stir until fully dissolved to obtain an aqueous sodium silicate solution. Dissolve 1-3 parts by weight of water-soluble polymer in the remaining deionized water, and then slowly add the sodium silicate solution dropwise to the aqueous solution of the water-soluble polymer. After the addition is complete, adjust the pH of the mixture to 7-8 using acid and react for 2-3 hours under low-speed stirring. Then add the prescribed amount of emulsifier to obtain mixed system b.

[0030] The beneficial effects of this invention are:

[0031] The polyester oiling agent for high-speed spinning described in this invention has the following advantages:

[0032] First, a shell layer is formed by reacting and cross-linking Pluronic-NHS with a water-soluble polymer containing hydroxyl groups to coat the outside of the core suspension. Under the coating, separation and sealing effect of the shell layer, the inorganic nano-lubricating particles in the core suspension are not easy to flow out from the shell layer. In this way, the purpose of separating the core suspension containing inorganic nano-lubricating particles into multiple micro-units is achieved through the shell layer. The core suspension and the inorganic nano-lubricating particles in different micro-units are not easy to come into direct contact. Thus, large-scale aggregation between inorganic nano-lubricating particles can be suppressed, so that they are uniformly dispersed in the oil and the stability of the oil can be improved.

[0033] Secondly, the inorganic nano-lubricating particles can be well immersed in the oily dispersion medium in the core suspension, so as to realize the free sliding or rotation of the inorganic nano-lubricating particles during use and effectively exert the anti-wear and friction reduction effect.

[0034] Third, during use, as the temperature of the oil agent rises, the shell layer in the oil-containing lubricating particles can rapidly shrink in size through a sol-gel phase transition, releasing some of the oily dispersion medium to form a stronger and more complete oil film covering the fiber surface. This not only improves the lubrication effect of the oil agent but also enhances the oleophilicity of the oil-containing lubricating particles, promoting good fusion between the oil-containing lubricating particles and the oil film, making it less likely for the oil-containing lubricating particles to fall off the fiber surface. At the same time, the oily dispersion medium released by the oil-containing lubricating particles can also achieve self-lubrication of the oil-containing lubricating particles.

[0035] Fourth, unlike existing technologies that directly add inorganic nanoparticles, the inorganic nanoparticles in the oil-containing lubricating particles come into contact with the fibers through a soft oil-containing shell and an oily dispersion medium contained within the shell. During friction, on the one hand, this soft oil-containing shell can buffer the impact of the inorganic nanoparticles on the friction pair, preventing hard particles from directly scratching the fiber surface or equipment surface; on the other hand, this soft oil-containing shell has a certain degree of elasticity and deformation capacity, which can form an adaptive effect on the surface of the friction pair, fill the microscopic unevenness of the fiber surface, improve the friction surface, and further reduce friction and wear.

[0036] Fifth, inorganic nano-lubricating particles easily adhere to the fiber surface: The inorganic nano-lubricating particles provided by this invention adhere to the fiber through chain segments in the cross-linked network and the oil phase encapsulated therein. Compared with the direct adhesion of inorganic nano-lubricating particles, the oil-containing cross-linked network has lower surface tension and better lubricity, making it easier for the oil-containing lubricating particles to spread and adhere to the fiber surface. At the same time, the functional groups in the network macromolecules in the oil-containing cross-linked network can react chemically with the active groups on the fiber surface to form chemical bonds, thereby significantly improving the adhesion stability of inorganic particles. In addition, the network macromolecular chain segments can easily form mechanical connections such as entanglement and embedding with the microstructure of the fiber surface, further enhancing the bonding force between the oil-containing lubricating particles and the fiber.

[0037] Sixth, based on this, the present invention uses the reaction of fatty acid salts in clear limewater to form calcium fatty acid, which is then deposited on the surface of inorganic nano-lubricating particles, thereby improving their surface properties and enabling them to be dispersed more uniformly and stably in the oil phase.

[0038] Seventh, by setting star-shaped nodes on the cross-linking network, the present invention can, on the one hand, enhance the cross-linking network through the introduction of star-shaped nodes, and on the other hand, the inorganic nanoparticles attached to the cross-linking network can achieve a microstructure similar to a "ball bearing". They can move over short distances, but are not easy to move over long distances due to the constraint of chain segments. In this way, the star-shaped nodes on them can be fixed within a specific range through the cross-linking network, which can play a role in anti-friction and wear reduction while being less prone to agglomeration.

[0039] Eighth, in this invention, the uniformity of the star-shaped nodes and the bonding stability between the inorganic nanoparticles and the water-soluble polymer network are improved by reactive in-situ deposition. The result is a star-shaped node that is constrained by the polymer chain segments over long distances but can move over short distances and is arranged in a certain way. While playing a role in anti-wear and friction reduction, it can also be stably attached to the fiber and effectively prevent agglomeration.

[0040] In summary, the high-speed spinning polyester oiling agent of the present invention improves the anti-wear and friction-reducing properties, lubrication properties, stability and anti-agglomeration ability of the oiling agent by optimizing the addition method of nanoparticles. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of the oil-containing lubricating particles in the oil agent of the present invention;

[0042] Figure 2 This is another structural schematic diagram of the oil-containing lubricating particles in the oil agent described in this invention;

[0043] The markings in the diagram are as follows:

[0044] 1. Shell layer, 101. Cross-linked network; 102. Star-shaped node; 2. Core suspension, 201. Inorganic nano-lubricating particles. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0046] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0047] It should be noted that, in this application, the terms "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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0048] A high-speed spinning polyester oiling agent, by weight, comprises: 40-60 parts of a smoothing agent, 10-20 parts of an emulsifier, 5-20 parts of an antistatic agent, 5-10 parts of a bridging agent, and 5-15 parts of oil-containing lubricating particles. The oil-containing lubricating particles comprise a core suspension 2 and a shell layer 1 covering the outer side of the core suspension 2. The core suspension 2 comprises an oily dispersion medium and inorganic nano-lubricating particles 201 dispersed in the oily dispersion medium. The shell layer 1 is a temperature-sensitive reversible cross-linked network structure.

[0049] Preferably, the shell layer 1 is an amphiphilic, thermosensitive, reversible cross-linked network structure.

[0050] Furthermore, the shell layer 1 includes a cross-linked network 101, which is a thermosensitive reversible cross-linked network structure formed by reacting and cross-linking different chain segments with a water-soluble polymer containing hydroxyl groups, and interlocking with each other.

[0051] As some examples of the present invention, the water-soluble polymer used to prepare the crosslinked network 101 is selected from one or more of carboxymethyl cellulose (CMC), hydroxypropyl methyl cellulose (HPMC), polyvinyl alcohol (PVA), polyethylene glycol (PEG), starch, chitosan and its derivatives, hyaluronic acid (HA), etc.

[0052] Furthermore, it should be noted that the preparation process of Pluronic-NHS used in this invention is prior art, and for details, please refer to Chinese patent application number 202410264898.7. The preparation principle of the crosslinked network 101 is as follows: carboxymethyl cellulose (CMC), hydroxypropyl methyl cellulose (HPMC), polyvinyl alcohol (PVA), polyethylene glycol (PEG), starch, chitosan and its derivatives, and hyaluronic acid (HA) can react and crosslink with Pluronic-NHS through the hydroxyl groups on their molecular chains to form the thermosensitive reversible crosslinked network structure.

[0053] Preferably, the water-soluble polymer used to prepare the crosslinked network 101 is selected from one or more of carboxymethyl cellulose (CMC), hydroxypropyl methyl cellulose (HPMC), polyvinyl alcohol (PVA), polyethylene glycol (PEG), and starch.

[0054] Furthermore, the HLB value of the Prönnik raw material used to prepare the Prönnik-NHS is <10, preferably 5 to 9.

[0055] As some examples of the present invention, the Plunk is selected from one or more of P123, L121, L101, L81, L61, L31, etc.

[0056] As some examples of the present invention, the inorganic nano-lubricating particles 201 have a particle size ≤100nm, and the inorganic nano-lubricating particles 201 are selected from one or more of calcium carbonate, titanium dioxide, silicon dioxide, boron nitride, cadmium sulfide, graphite, carbon nanotubes, etc.

[0057] Furthermore, star-shaped nodes 102 are attached to the cross-linked network 101 in the shell 1, and the star-shaped nodes 102 are formed by inorganic nanoparticles attached to the cross-linked network 101.

[0058] Specifically, the star-shaped node 102 is an inorganic nanoparticle attached to the Pronnicke-NHS and / or water-soluble polymer chain segments containing hydroxyl groups.

[0059] Preferably, the star-shaped node 102 is an inorganic nanoparticle attached to the water-soluble polymer chain segment containing hydroxyl groups.

[0060] As some examples of the present invention, the smoothing agent is selected from one or more of mineral oil, vegetable oil, natural or synthetic fatty acid esters, fatty alcohols or fatty acid polyethers.

[0061] Preferably, the smoothing agent is a mixture of mineral oil, synthetic fatty acid ester, and polyether, wherein the mass ratio of mineral oil, synthetic fatty acid ester, and polyether is (1~3):(3~5):(2~4).

[0062] Preferably, the polyether is selected from one or more of linear fatty alcohol polyoxyethylene ethers and branched fatty alcohol polyoxyethylene ethers.

[0063] As some examples of the present invention, the emulsifier is selected from one or more of the following: sorbitan fatty acid ester, polyethylene glycol fatty acid ester, castor oil polyoxyethylene ether, sodium lauryl ether sulfate, N-methylamide carboxylate, sorbitan fatty acid ester polyoxyethylene ether, polyoxyethylene cholesterol ether, etc.

[0064] As some examples of the present invention, the antistatic agent is selected from one or more of quaternary ammonium salts, alkyl phosphate salts, alkyl polyoxyethylene ether phosphate salts, alkyl sulfate salts, alkyl alcohol phosphate polyoxyethylene ethers, alkyl sulfonates, etc.

[0065] As some examples of the present invention, the bridging agent is selected from one or more of the following: coconut oil diethanolamide, triethanolamine oleate, polyethylene glycol laurate, polyoxyethylene laurate, glycerol random polyether, and N-acyl amino acid salt.

[0066] As some examples of the present invention, the high-speed spinning polyester oil also includes 1 to 3 parts by weight of antioxidants, defoamers and other auxiliaries.

[0067] Furthermore, the present invention also provides a method for preparing the above-mentioned high-speed spinning polyester oiling agent, as follows:

[0068] S1, Pretreatment of inorganic nano-lubricating particles: First, the inorganic nano-lubricating particles are dispersed in a soluble calcium salt solution, then fatty acid salts are added dropwise. After reacting at room temperature and stirring for 10-30 minutes, the particles are separated and dried to obtain the pretreated inorganic nano-lubricating particles.

[0069] S2, Preparation of core suspension: Disperse the inorganic nano-lubricating particles pretreated in step S1 into an oily dispersion medium. After uniform dispersion, the core suspension is obtained.

[0070] S3, Preparation of oil-containing lubricating particles: The core suspension obtained in step S2 and Pluronic-NHS are dispersed in an organic solvent to obtain mixed system a. Water-soluble polymer, deionized water and emulsifier are mixed and stirred thoroughly to obtain mixed system b. Then, mixed system a is slowly added to mixed system b. After the addition is complete, the mixture is emulsified under ultrasonication at 5~18℃ for 10~20 min. After distillation to remove the organic solvent, a dispersion of oil-containing lubricating particles is obtained. The dispersion of oil-containing lubricating particles is then freeze-dried to obtain oil-containing lubricating particles.

[0071] S4, Preparation of the oil phase: According to the weight ratio of smoothing agent, emulsifier, antistatic agent and bridging agent in polyester oil, mix appropriate amounts of smoothing agent, emulsifier, antistatic agent and bridging agent, and stir evenly to obtain the oil phase;

[0072] S5, Preparation of high-speed spinning polyester oil: Take the oil-containing lubricating particles prepared in step S3 and disperse them into the oil phase prepared in step S4. First, stir at 5~15℃ for 20~30 min, then heat to 30~40℃ and stir for 5~10 min to obtain high-speed spinning polyester oil.

[0073] Preferably, in step S1, the fatty acid salt is a salt compound formed by the reaction of fatty acids with sodium hydroxide and potassium hydroxide, and its general structural formula is R-COO. - M + In this context, R is a hydrocarbon group, and M is a monovalent metal cation, such as Na. + K + wait.

[0074] As some examples of the present invention, the fatty acid salt is selected from one or more of potassium laurate, sodium oleate, potassium oleate, sodium stearate, sodium laurate, sodium myristate, sodium palmitate, potassium linoleate, etc.

[0075] Preferably, the fatty acid salt is selected from one or more of sodium oleate, potassium oleate, sodium stearate, and potassium stearate.

[0076] Preferably, in step S1, before dispersing the inorganic nano-lubricating particles into a soluble calcium salt solution, the inorganic nano-lubricating particles may be pre-treated with dopamine or the like to improve the adsorption capacity of the inorganic nano-lubricating particles for the calcium fatty acid generated in the reaction, thereby improving the adhesion rate and adhesion stability of the calcium fatty acid on the surface of the inorganic nano-lubricating particles.

[0077] As some examples of the present invention, the process of surface modification treatment of the inorganic nano-lubricating particles with dopamine is as follows:

[0078] First, mix 1-3 parts by weight of dopamine powder with 10-20 parts by weight of water and stir until the dopamine powder is fully dissolved. Then, add 5-10 parts by weight of inorganic nano-lubricating particles and stir until the inorganic nano-lubricating particles are evenly dispersed. Next, add 100-150 parts by weight of an alkaline solution with a concentration of 5-10 wt%. After reacting for 10-20 hours with stirring, centrifuge, wash with water, filter, and dry to obtain polydopamine-modified inorganic nano-lubricating particles.

[0079] Preferably, when using polydopamine to modify the surface of the inorganic nano-lubricating particles, the stirring and reaction should be carried out under light-protected conditions.

[0080] Furthermore, in step S1, the amount of fatty acid salt added is 15-25% of the weight of inorganic nano-lubricating particles, the concentration of calcium ions in the soluble calcium salt solution is 0.1-1 mol / L, and the content of inorganic nano-lubricating particles in the soluble calcium salt solution is 5-15 wt%.

[0081] As some examples of the present invention, the soluble calcium salt solution is calcium chloride, calcium nitrate, etc.

[0082] Furthermore, in step S2, the selection of the oily dispersion medium can be made with reference to the aforementioned smoothing process. For example, the oily dispersion medium can be selected from one or more of mineral oil, vegetable oil, natural or synthetic fatty acid esters, fatty alcohols or fatty acid polyethers.

[0083] Preferably, the oily dispersion medium is a mixture of natural or synthetic fatty acid esters and vegetable oil, wherein the mass ratio of natural or synthetic fatty acid esters to vegetable oil is (6~8):(2~4).

[0084] Compared to other oily dispersion media, fatty acid ester molecules possess long-chain alkyl groups and polar ester groups, enabling them to bind to the surface of nanoparticles through hydrophobic interactions. Simultaneously, the polarity of the ester groups can form hydrogen bonds or electrostatic interactions with the particle surface, enhancing dispersion stability. Furthermore, fatty acid esters have relatively low surface tension, which helps wet the nanoparticle surface and reduces the tendency to aggregate. Meanwhile, vegetable oils contain triglyceride structures, which have a certain degree of polarity and can also interact with the nanoparticle surface, promoting stable dispersion of nanoparticles in oily dispersion media.

[0085] Preferably, the content of the inorganic nano-lubricating particles in the core suspension is 4~10wt%.

[0086] Furthermore, in the mixing system a in step S3, the weight ratio of the core suspension, Pluronic-NHS and organic solvent is (5~15):(1~3):(100~300).

[0087] Furthermore, in the mixing system b in step S3, the weight ratio of the water-soluble polymer, emulsifier and deionized water is (1~3):(5~20):(150~300).

[0088] Furthermore, in step S3, the weight ratio of Pluronic-NHS to the water-soluble polymer is (1~1.3):1.

[0089] Furthermore, the mixed system b in step S3 also includes inorganic nanoparticles with a particle size ≤10nm, which are attached to the crosslinking network 101 to form the star-shaped nodes 102.

[0090] As some examples of the present invention, in step S3, the preparation process of the mixed system b is as follows:

[0091] First, the water-soluble polymer is dissolved in deionized water according to the weight ratio to prepare an aqueous solution. Then, the inorganic nanoparticles and emulsifier are dispersed in the aqueous solution of the water-soluble polymer and stirred until uniformly dispersed to obtain the mixed system b.

[0092] In the mixed system b, the amount of inorganic nanoparticles added is 0.5 to 3 times the amount of water-soluble polymer added.

[0093] Preferably, in the preparation of the mixed system b, the water-soluble polymer can first be dissolved in 30-50 wt% of deionized water to prepare an aqueous solution. Then, the inorganic nanoparticles and emulsifier are dispersed in the aqueous solution of the water-soluble polymer and stirred until uniformly dispersed. Finally, the remaining deionized water is added and stirred until uniformly dispersed to obtain the mixed system b.

[0094] This step-by-step water addition method allows the polymer chains to come into more full contact with the inorganic nanoparticles in the initial stage, thereby improving the adhesion efficiency of the inorganic nanoparticles.

[0095] In the aforementioned process, water-soluble polymers can utilize their numerous hydrophilic groups, such as hydroxyl groups, to form a three-dimensional network structure in water. This extension and entanglement of molecular chains creates a physical barrier, generating a steric hindrance effect that hinders the aggregation of nanoparticles and fixes them onto the network through adsorption. Meanwhile, inorganic nanoparticles typically possess charged or polar groups on their surfaces, which can bind to the hydrophilic groups on the polymer chains through electrostatic interactions, hydrogen bonds, or van der Waals forces. Simultaneously, the inorganic nanoparticles adsorbed onto the network maintain a dispersed state due to the steric hindrance effect, reducing their tendency to aggregate.

[0096] Furthermore, in preparing the mixed system b, the star-shaped nodes 102 can be formed by reactive in-situ deposition to improve the bonding stability between the inorganic nanoparticles and the water-soluble polymer network.

[0097] As some examples of the present invention, the process of improving the bonding stability between the inorganic nanoparticles and the water-soluble polymer network by reactive in-situ deposition is as follows:

[0098] Dissolve 2-10 parts by weight of sodium silicate in 10-40 parts by weight of deionized water and stir until fully dissolved to obtain an aqueous sodium silicate solution. Dissolve 1-3 parts by weight of water-soluble polymer in the remaining deionized water, and then slowly add the sodium silicate solution dropwise to the aqueous solution of the water-soluble polymer. After the addition is complete, adjust the pH of the mixture to 7-8 using acid and react for 2-3 hours under low-speed stirring. Then add the prescribed amount of emulsifier to obtain the mixed system b.

[0099] Furthermore, in step S3, after distilling to remove the organic solvent and obtaining a dispersion of oil-containing lubricating particles, the dispersion can be heated to 35~55℃ and kept at that temperature for 3~5 min, then surfactant SDS can be added, and the dispersion can be stirred at the current temperature for 5~10 min, followed by freeze drying to obtain oil-containing lubricating particles.

[0100] Preferably, in step S3, the amount of surfactant SDS added is 0.01~0.03% of the weight of the water-soluble polymer in the dispersion of oil-containing lubricating particles. The negatively charged hydrophilic groups in the surfactant SDS can interact with the hydroxyl groups on the molecular chains of the water-soluble polymer, reducing the number of hydroxyl groups in the dispersion system of oil-containing lubricating particles, especially on the surface of the oil-containing lubricating particles, and improving the dispersion stability of the oil-containing lubricating particles.

[0101] The polyester oiling agent for high-speed spinning described in this invention has the following advantages:

[0102] First, a shell layer 1 is formed by reacting and cross-linking Pluronic-NHS and a water-soluble polymer containing hydroxyl groups to coat the outside of the core suspension 2. Under the coating, separation and sealing effect of the shell layer 1, the inorganic nano-lubricating particles 201 in the core suspension 2 are not easy to flow out from the shell layer 1. In this way, the purpose of separating the core suspension 2 containing inorganic nano-lubricating particles 201 into multiple micro-units is achieved through the shell layer 1. The core suspension 2 and the inorganic nano-lubricating particles 201 in different micro-units are not easy to come into direct contact. In this way, the large-scale aggregation of inorganic nano-lubricating particles 201 can be suppressed, so that they are uniformly dispersed in the oil and the stability of the oil can be improved.

[0103] Secondly, the inorganic nano-lubricating particles 201 can be well immersed in the oily dispersion medium in the core suspension 2, so as to realize the free sliding or rotation of the inorganic nano-lubricating particles 201 during use, and effectively play the role of anti-wear and friction reduction.

[0104] Third, during use, as the temperature of the oil agent rises, the shell layer 1 in the oil-containing lubricating particles can rapidly shrink in size through a sol-gel phase transition, releasing some of the oily dispersion medium to form a stronger and more complete oil film covering the fiber surface. This not only improves the lubrication effect of the oil agent but also enhances the oleophilicity of the oil-containing lubricating particles, promoting good fusion between the oil-containing lubricating particles and the oil film, making it less likely for the oil-containing lubricating particles to fall off the fiber surface. At the same time, the oily dispersion medium released by the oil-containing lubricating particles can also achieve self-lubrication of the oil-containing lubricating particles.

[0105] Fourth, unlike existing technologies that directly add inorganic nanoparticles, the inorganic nano-lubricating particles 201 in the oil-containing lubricating particles come into contact with the fibers through a soft oil-containing shell layer 1 and an oily dispersion medium contained within the shell layer 1. During the friction process, on the one hand, this soft oil-containing shell layer 1 can buffer the impact of the inorganic nano-lubricating particles 201 on the friction pair, preventing hard particles from directly scratching the fiber surface or equipment surface; on the other hand, this soft oil-containing shell layer 1 has a certain elasticity and deformation capacity, which can form an adaptive effect on the surface of the friction pair, fill the microscopic unevenness of the fiber surface, improve the friction surface, and further reduce friction and wear.

[0106] Fifth, the inorganic nano-lubricating particles 201 easily adhere to the fiber surface: The inorganic nano-lubricating particles 201 provided by this invention adhere to the fiber through the chain segments in the cross-linked network 101 and the oil phase encapsulated therein. Compared with the direct adhesion of inorganic nano-lubricating particles 201, the oil-containing cross-linked network 101 has lower surface tension and better lubricity, making it easier for the oil-containing lubricating particles to spread and adhere to the fiber surface. At the same time, the functional groups in the network macromolecules in the oil-containing cross-linked network 101 can react chemically with the active groups on the fiber surface to form chemical bonds, thereby significantly improving the adhesion stability of inorganic particles. In addition, the network macromolecular chain segments can easily form mechanical connections such as entanglement and embedding with the microstructure of the fiber surface, further enhancing the bonding force between the oil-containing lubricating particles and the fiber.

[0107] Sixth, based on this, the present invention uses the reaction of fatty acid salts in clear limewater to form calcium fatty acid, which is then deposited on the surface of inorganic nano-lubricating particles, thereby improving their surface properties and enabling them to be dispersed more uniformly and stably in the oil phase.

[0108] Seventh, by setting star-shaped nodes 102 on the cross-linked network 101, this invention can, on the one hand, strengthen the cross-linked network through the introduction of star-shaped nodes 102; on the other hand, the inorganic nanoparticles attached to the cross-linked network 101 can achieve a microstructure similar to a "ball bearing," and while they can move over short distances, they are not easily moved over long distances due to the constraint of chain segments. Thus, the star-shaped nodes 102 on the cross-linked network 101 can be fixed within a specific range, achieving anti-friction and wear-reducing effects while preventing agglomeration. Simultaneously, during the preparation process, the particle size and density of the star-shaped nodes 102 should be controlled to avoid the star-shaped nodes 102 on the cross-linked network 101 becoming too large or too dense, thus preventing the formation of excessively large aggregates.

[0109] Eighth, in this invention, the uniformity of the star-shaped nodes 102 and the bonding stability between the inorganic nanoparticles and the water-soluble polymer network are improved by reactive in-situ deposition. Finally, a star-shaped node 102 arranged in a certain way is obtained, which has a long-distance motion freedom constrained by the polymer chain segments but can move short distances. While playing a role in anti-wear and friction reduction, it can also be stably attached to the fiber and effectively prevent the occurrence of agglomeration.

[0110] In summary, the high-speed spinning polyester oiling agent of the present invention improves the anti-wear and friction-reducing properties, lubrication properties, stability and anti-agglomeration ability of the oiling agent by optimizing the addition method of nanoparticles.

[0111] The following specific examples illustrate the polyester oiling agent for high-speed spinning described in this invention:

[0112] Example 1

[0113] Pretreatment of inorganic nano-lubricating particles:

[0114] First, inorganic nano-lubricating particles are dispersed in a soluble calcium salt solution, then sodium oleate is added dropwise. After reacting at room temperature with stirring for 20 minutes, the mixture is separated and dried to obtain pretreated inorganic nano-lubricating particles. The inorganic nano-lubricating particles are silica, the soluble calcium salt is a calcium chloride solution, the amount of sodium oleate added is 20% of the weight of the inorganic nano-lubricating particles, the concentration of calcium ions in the soluble calcium salt solution is 0.5 mol / L, and the content of inorganic nano-lubricating particles in the soluble calcium salt solution is 10 wt%.

[0115] Example 2

[0116] Pretreatment of inorganic nano-lubricating particles:

[0117] First, 3 parts by weight of dopamine powder and 20 parts by weight of deionized water were mixed and stirred until the dopamine powder was fully dissolved. Then, 10 parts by weight of inorganic nano-lubricating particles silica were added and stirred until the inorganic nano-lubricating particles were evenly dispersed. Then, 120 parts by weight of an 8 wt% alkaline solution were added and reacted for 15 hours under stirring. After centrifugation, washing with water, filtration and drying were performed to obtain polydopamine surface-modified inorganic nano-lubricating particles.

[0118] Then, the polydopamine-modified inorganic nano-lubricating particles were dispersed in a calcium chloride solution, followed by the addition of sodium oleate. After reacting at room temperature with stirring for 20 minutes, the mixture was separated and dried to obtain the pretreated inorganic nano-lubricating particles. The amount of sodium oleate added was 20% of the weight of the inorganic nano-lubricating particles, the concentration of calcium ions in the soluble calcium salt solution was 0.5 mol / L, and the content of inorganic nano-lubricating particles in the soluble calcium salt solution was 10 wt%.

[0119] Example 3

[0120] Preparation of mixed system b:

[0121] Mixing water-soluble polymer, deionized water and emulsifier according to the weight ratio and stirring thoroughly yields mixture system b, wherein the water-soluble polymer is polyvinyl alcohol, the emulsifier is Tween 80, and the weight ratio of water-soluble polymer, emulsifier and deionized water is 2:10:200.

[0122] Example 4

[0123] Preparation of mixed system b:

[0124] A water-soluble polymer, polyvinyl alcohol, is dissolved in deionized water according to a weight ratio to prepare an aqueous solution. Then, inorganic nanoparticles, titanium dioxide, and emulsifier, Tween 80, are dispersed in the aqueous solution of the water-soluble polymer. After stirring until uniform dispersion, the mixed system b is obtained. The weight ratio of the water-soluble polymer, emulsifier, and deionized water is 2:10:200, and the amount of inorganic nanoparticles added is twice the amount of the water-soluble polymer added.

[0125] Example 5

[0126] Preparation of mixed system b:

[0127] First, according to the weight ratio, the water-soluble polymer polyvinyl alcohol is dissolved in 30 wt% of deionized water to prepare an aqueous solution. Then, the inorganic nanoparticles titanium dioxide and the emulsifier Tween 80 are dispersed into the aqueous solution of the water-soluble polymer. After stirring until uniformly dispersed, the remaining deionized water is added and stirred evenly to obtain the mixed system b. The weight ratio of the water-soluble polymer, emulsifier and deionized water is 2:10:200, and the amount of inorganic nanoparticles added is twice the amount of water-soluble polymer added.

[0128] Example 6

[0129] Preparation of mixed system b:

[0130] Dissolve 8 parts by weight of sodium silicate in 30 parts by weight of deionized water and stir until fully dissolved to obtain an aqueous sodium silicate solution. Dissolve 2 parts by weight of water-soluble polymer polyvinyl alcohol in the remaining deionized water. Then, slowly add the sodium silicate solution dropwise to the aqueous solution of the water-soluble polymer. After the addition is complete, adjust the pH of the mixture to 8 with acid and react for 3 hours under low-speed stirring. Then, add the prescribed amount of emulsifier Tween 80 to obtain the mixed system b. The weight ratio of water-soluble polymer, emulsifier and deionized water is 2:10:200.

[0131] Examples 7-11

[0132] Preparation of oil-containing lubricating particles:

[0133] (1) First, the inorganic nano-lubricating particles pretreated in Examples 1 and 2 above are dispersed in an oily dispersion medium. After uniform dispersion, core suspension A and core suspension B with an inorganic nano-lubricating particle content of 5wt% are obtained. The oily dispersion medium is a mixture of synthetic fatty acid ester and vegetable oil in a weight ratio of 6:2.

[0134] (2) Then, the prepared core suspension A or B and Prönnick-NHS are dispersed in an organic solvent to obtain a mixed system a. Specifically, the Prönnick used to prepare Prönnick-NHS is L121, and the organic solvent is dichloromethane. Then, the mixed system a is slowly added to the mixed system b prepared in Examples 3 to 6. After the addition is complete, the mixture is emulsified at 10°C under ultrasonication for 15 min. After distillation to remove the organic solvent, a dispersion of oil-containing lubricating particles is obtained. Then, the dispersion of oil-containing lubricating particles is freeze-dried to obtain oil-containing lubricating particles.

[0135] in:

[0136] In mixture system a, the mass ratio of core suspension, Pluronic-NHS and organic solvent is 10:2:200, and the weight ratio of Pluronic-NHS and water-soluble polymer in mixture system b is 1.2:1.

[0137] The oil-containing lubricating particles in Example 7 were prepared using the inorganic nano-lubricating particles pretreated in Example 1 and the mixed system b prepared in Example 3.

[0138] The oil-containing lubricating particles in Example 8 were prepared using the inorganic nano-lubricating particles pretreated in Example 2 and the mixed system b prepared in Example 3.

[0139] The oil-containing lubricating particles in Example 9 were prepared using the inorganic nano-lubricating particles pretreated in Example 2 and the mixed system b prepared in Example 4.

[0140] The oil-containing lubricating particles in Example 10 were prepared using the inorganic nano-lubricating particles pretreated in Example 2 and the mixed system b prepared in Example 5.

[0141] The oil-containing lubricating particles in Example 11 were prepared using the inorganic nano-lubricating particles pretreated in Example 2 and the mixed system b prepared in Example 6.

[0142] Example 12

[0143] Preparation of oil-containing lubricating particles:

[0144] (1) First, the inorganic nano-lubricating particles pretreated in Example 2 above are dispersed into an oily dispersion medium. After being dispersed evenly, a core suspension B with an inorganic nano-lubricating particle content of 5wt% is obtained. The oily dispersion medium is a mixture of synthetic fatty acid ester and vegetable oil in a weight ratio of 6:2.

[0145] Then, the prepared core suspension B and Pluronic-NHS were dispersed in an organic solvent to obtain mixed system a. In mixed system a, the Pluronic used to prepare Pluronic-NHS was specifically L121, the organic solvent was dichloromethane, the mass ratio of the core suspension, Pluronic-NHS and the organic solvent was 10:2:200, and the weight ratio of Pluronic-NHS and the water-soluble polymer in mixed system b was 1.2:1. Then, mixed system a was slowly added to mixed system b prepared in Example 6. After the addition was complete, it was emulsified at 10°C under ultrasound for 15 min, and the organic solvent was removed by distillation to obtain a dispersion of oil-containing lubricating particles. The dispersion was then heated to 40°C and kept at that temperature for 5 min. The surfactant SDS was added at an amount of 0.02% of the weight of the water-soluble polymer in the dispersion of oil-containing lubricating particles. The dispersion was stirred at the current temperature for 10 min and then freeze-dried to obtain oil-containing lubricating particles.

[0146] Examples 13-20

[0147] Preparation of polyester oiling agent for high-speed spinning:

[0148] Weigh each raw material for preparing high-speed spinning polyester oil according to the weight ratio shown in Table 1 below, mix the smoothing agent, emulsifier, antistatic agent and slubber, and stir evenly to obtain an oil phase. Then, take the oil-containing lubricating particles prepared in Examples 7 to 12 above according to the weight ratio, disperse them into the pre-prepared oil phase, and stir at 10°C for 25 minutes to obtain high-speed spinning polyester oil.

[0149] Table 1. Raw material ratio of oil agent

[0150]

[0151] The smoothing agent is a mixture of mineral oil, synthetic fatty acid ester, and polyether in a mass ratio of 2:5:3; the emulsifier is a mixture of sorbitan fatty acid ester, castor oil polyoxyethylene ether, and N-methylamide carboxylate in a mass ratio of 1:0.5:0.5; the antistatic agent is a mixture of quaternary ammonium salt, alkyl phosphate salt, and alkyl sulfonate in a mass ratio of 0.5:1:0.5; and the bridging agent is coconut oil diethanolamide.

[0152] Comparative Example 1

[0153] Preparation of polyester oiling agent for high-speed spinning:

[0154] The only difference between it and Example 13 above is that no oil-containing lubricating particles are added.

[0155] Comparative Example 2

[0156] Preparation of high-speed spinning polyester oil: The only difference between this and Example 13 above is that 5 parts by weight of inorganic nano-lubricating particles are directly added to the spinning oil to replace the oil-containing lubricating particles.

[0157] Oil performance testing:

[0158] (I) The lubrication and friction-reducing properties of the high-speed spinning polyester oils prepared in Examples 13-20 and Comparative Examples 1-2 were tested, and the results are shown in Table 2 below. The oil film strength was tested using a four-ball friction meter according to GB / T3142-82; the dynamic friction coefficient μ... d The coefficient of kinetic friction between polyester fiber and metal;

[0159] Table 2. Test results of the lubricating and friction-reducing properties of the oil.

[0160]

[0161] (I) The lubrication and friction-reducing properties of the high-speed spinning polyester oils prepared in Examples 13-20 and Comparative Examples 1-2 were tested by spinning experiments. The spinning specification was 100 dtex / 72f, and the spinning speed was 3800 m / min. The results obtained from the spinning performance tests are shown in Table 3 below:

[0162] Table 3. Results of oil-based spinning performance tests

[0163]

[0164] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A polyester oiling agent for high-speed spinning, characterized in that, By weight, it comprises: 40-60 parts of smoothing agent, 10-20 parts of emulsifier, 5-20 parts of antistatic agent, 5-10 parts of bridging agent, and 5-15 parts of oil-containing lubricating particles, wherein the oil-containing lubricating particles comprise a core suspension and a shell layer covering the outer side of the core suspension, wherein the core suspension comprises an oily dispersion medium and inorganic nano-lubricating particles dispersed in the oily dispersion medium, and the shell layer is a temperature-sensitive reversible cross-linked network structure; The shell layer includes: a cross-linked network; The cross-linked network is a thermosensitive and reversible cross-linked network structure formed by reacting and cross-linking Pluronic-NHS with a water-soluble polymer containing hydroxyl groups. The preparation process of the polyester oiling agent for high-speed spinning is as follows: S1, Pretreatment of inorganic nano-lubricating particles: First, the inorganic nano-lubricating particles are dispersed in a soluble calcium salt solution, then fatty acid salts are added dropwise. After reacting at room temperature and stirring for 10-30 minutes, the particles are separated and dried to obtain the pretreated inorganic nano-lubricating particles. S2, Preparation of core suspension: Disperse the inorganic nano-lubricating particles pretreated in step S1 into an oily dispersion medium. After uniform dispersion, the core suspension is obtained. S3, Preparation of oil-containing lubricating particles: The core suspension obtained in step S2 and Pluronic-NHS are dispersed in an organic solvent to obtain mixed system a. Water-soluble polymer, deionized water and emulsifier are mixed and stirred thoroughly to obtain mixed system b. Then, mixed system a is slowly added to mixed system b. After the addition is complete, the mixture is emulsified under ultrasonication at 5~18℃ for 10~20 min. After distillation to remove the organic solvent, a dispersion of oil-containing lubricating particles is obtained. The dispersion of oil-containing lubricating particles is then freeze-dried to obtain oil-containing lubricating particles. S4, Preparation of the oil phase: According to the weight ratio of smoothing agent, emulsifier, antistatic agent and bridging agent in polyester oil, mix appropriate amounts of smoothing agent, emulsifier, antistatic agent and bridging agent, and stir evenly to obtain the oil phase; S5, Preparation of high-speed spinning polyester oil: Take the oil-containing lubricating particles prepared in step S3 and disperse them into the oil phase prepared in step S4. First, stir at 5~15℃ for 20~30 min, then heat to 30~40℃ and stir for 5~10 min to obtain high-speed spinning polyester oil.

2. The polyester oiling agent for high-speed spinning according to claim 1, characterized in that, Star-shaped nodes are attached to the cross-linking network in the shell, and the star-shaped nodes are formed by inorganic nanoparticles attached to the cross-linking network.

3. The polyester oiling agent for high-speed spinning according to claim 2, characterized in that, The star-shaped nodes are inorganic nanoparticles attached to the Pronnicke-NHS and / or water-soluble polymer chains containing hydroxyl groups.

4. The polyester oiling agent for high-speed spinning according to claim 3, characterized in that, The star-shaped nodes are inorganic nanoparticles attached to the water-soluble polymer chains containing hydroxyl groups.

5. The polyester oiling agent for high-speed spinning according to claim 1, characterized in that, The smoothing agent is a mixture of mineral oil, synthetic fatty acid ester, and polyether, wherein the mass ratio of mineral oil, synthetic fatty acid ester, and polyether is (1~3):(3~5):(2~4).

6. The polyester oiling agent for high-speed spinning according to claim 1, characterized in that, The mixed system b in step S3 also includes inorganic nanoparticles, the amount of which is 0.5 to 3 times the amount of water-soluble polymer. The preparation process of the mixed system b in step S3 is as follows: The water-soluble polymer was dissolved in deionized water according to the weight ratio to prepare an aqueous solution. Then, the inorganic nanoparticles and emulsifier were dispersed into the aqueous solution of the water-soluble polymer and stirred until uniformly dispersed to obtain mixed system b. or, First, the water-soluble polymer is dissolved in 30-50 wt% of deionized water to prepare an aqueous solution. Then, the inorganic nanoparticles and emulsifier are dispersed into the aqueous solution of the water-soluble polymer and stirred until uniformly dispersed. Finally, the remaining deionized water is added and stirred until uniformly dispersed to obtain mixed system b.

7. The polyester oiling agent for high-speed spinning according to claim 1, characterized in that, The preparation process of the mixed system b in step S3 is as follows: Dissolve 2-10 parts by weight of sodium silicate in 10-40 parts by weight of deionized water and stir until fully dissolved to obtain an aqueous sodium silicate solution. Dissolve 1-3 parts by weight of water-soluble polymer in the remaining deionized water, and then slowly add the sodium silicate solution dropwise to the aqueous solution of the water-soluble polymer. After the addition is complete, adjust the pH of the mixture to 7-8 using acid and react for 2-3 hours under low-speed stirring. Then add the prescribed amount of emulsifier to obtain mixed system b.

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