High-performance flame-retardant polyester yarn and preparation method thereof

Abstract

The invention discloses a high-performance flame-retardant polyester yarn and a preparation method thereof, and belongs to the technical field of polyester yarns. The problem that the quality guarantee time of the escape blanket made of the flame-retardant polyester yarn containing the silicon flame retardant is not long enough due to the fact that the silicon flame retardant in the flame-retardant polyester yarn and sulfur-containing groups are subjected to sulfur-silicon exchange reaction after the escape blanket is subjected to wear-resistant treatment through an oil agent containing a sulfur silane coupling agent is solved. Comprising a polyester matrix and a sulfur-containing silane coupling agent oil agent applied to the surface of the polyester matrix. According to the invention, a sulfur-silicon reaction energy barrier is improved by grafting a tert-butyl phenyl steric hindrance group, and nucleophilic attack is blocked; n, N '-bis (2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine and the like are added into a polyester matrix, so that the thiol clearance rate of a fiber body is increased; a mercaptan scavenger and the like are introduced into the oiling agent, so that the occurrence time of harmful reactions is delayed to more than one year, and the problem that the quality guarantee period of the escape blanket is short is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polyester yarn, in particular to a high-performance flame-retardant polyester yarn and a preparation method thereof. BACKGROUND

[0002] Polyester yarn is an important chemical fiber. It is made of polyethylene terephthalate as raw material by spinning, and has the advantages of high strength, good elasticity, wear resistance, chemical corrosion resistance, etc. Polyester yarn fabric is crisp and not easy to wrinkle, easy to wash and dry, and has good shape retention, and is widely used in clothing, home textiles, industrial fabrics and other fields, such as making shirts, coats, quilt covers, tire cord fabrics, etc. It is one of the indispensable basic materials in modern textile industry.

[0003] The flame-retardant polyester yarn is processed by special process, and has the characteristics of not burning when encountering fire and delaying combustion. The function is realized by copolymerization or after-treatment of adding flame retardant, and has the advantages of high strength, chemical corrosion resistance, etc. It is widely used in special occasions such as fire-fighting clothes, protective gloves, and industrial fabrics, and other fields with strict requirements on fireproofing.

[0004] Because the application scene of flame-retardant polyester yarn mainly involves the possibility of encountering open flame, it not only needs to consider good flame-retardant effect, but also needs to consider excellent wear resistance to play a barrier protection effect. Especially the flame-retardant polyester yarn is applied to escape blankets and other products that are biased towards consumables. Because the positioning of the product itself determines that it does not need to be used repeatedly, the production cost and service life need to be controlled within a lower range. Therefore, in order to improve the wear resistance of the flame-retardant polyester yarn, an oil agent containing sulfur silane coupling agent is often used.

[0005] The silicon-based flame retardant in the flame-retardant polyester yarn reacts with the sulfur-containing group to form a brittle layer on the surface of the fiber. The reaction between the oil agent and the flame retardant is slow at room temperature, and after storage for 3 months, the phenomenon will appear. This condition will cause the flame retardant to fall off from the surface of the fiber, and the friction coefficient of the fiber will suddenly decrease, resulting in the "flying silk" phenomenon in textile processing. The finished fabric has insufficient flame retardant content, and finally the fabric woven from the polyester yarn loses the flame-retardant protection in the fire scene due to the falling off of the flame retardant.

[0006] However, due to the time length of the situation cannot be limited, many escape blankets made of wear-resistant treated by oil agent containing sulfur silane coupling agent and made of flame-retardant polyester filament containing silicon flame retardant will not be replaced in time in a short time frequently, usually only when the fire inspection is carried out every year, it is found that the escape blanket is expired, so that the escape blanket made of wear-resistant treated by oil agent containing sulfur silane coupling agent and made of flame-retardant polyester filament containing silicon flame retardant may appear the situation that the expiration is not found and the flame-retardant effect is invalid in the emergency.

[0007] Therefore, a high-performance flame-retardant polyester filament and a preparation method thereof are provided to solve or alleviate the above problems. SUMMARY

[0008] The purpose of the present application is to solve the shortcomings in the prior art and provide a high-performance flame-retardant polyester filament and a preparation method thereof.

[0009] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: A high-performance flame-retardant polyester filament, comprising a polyester base and a sulfur-containing silane coupling agent oil agent applied on the surface of the polyester base. The polyester base comprises 80-86.5% of polyethylene terephthalate resin, 12-18% of modified silicon flame retardant, 0.5-2% of reaction inhibitor, and 0.5-1.5% of processing aid, the modified silicon flame retardant comprises a polysiloxane grafted bulky steric hindrance group compound, and the reaction inhibitor comprises a 2,2,6,6-tetramethyl-4-piperidinamine derivative. The sulfur-containing silane coupling agent oil agent comprises 60-75% of base lubricant, 5-15% of sulfur-containing silane coupling agent, 3-8% of mercaptan scavenger, 5-10% of reaction inert barrier agent, 5-10% of emulsifier, and 1-3% of auxiliary agent.

[0010] Preferably, the modified silicon flame retardant comprises a base flame retardant and a modifier, the base flame retardant adopts polydimethylsiloxane grafted polyphosphate P-DMS-g-PP or polymethylphenylsiloxane PMPS, the modifier comprises 3,5-di-tert-butyl-4-hydroxyphenyl propionate or tris(2,4-di-tert-butylphenyl) phosphite derived silane coupling agent, and the steric hindrance group of the polysiloxane grafted bulky steric hindrance group compound is selected from 3,5-di-tert-butyl-4-hydroxyphenyl propionate or tris(2,4-di-tert-butylphenyl) phosphite.

[0011] Preferably, the reaction inhibitor comprises N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine.

[0012] Preferably, the reaction inhibitor further comprises a synergistic inhibitor, the synergistic inhibitor comprising dibutyl tin dilaurate or dibutyl tin bis(acetylacetone) complex.

[0013] Preferably, the processing aid comprises an antioxidant and a lubricant.

[0014] Preferably, the base lubricant comprises mineral oil, polyether, or high viscosity dimethyl silicone oil, the sulfur-containing silane coupling agent comprises γ-mercaptopropyl trimethoxysilane or bis-[3-(triethoxysil)propyl]tetrasulfide, the emulsifier comprises a non-ionic surfactant, and the auxiliary agent comprises an antifoaming agent and a preservative.

[0015] Preferably, the mercaptan scavenger comprises a multifunctional mercapto compound.

[0016] Preferably, the mercaptan scavenger comprises a primary scavenger, the primary scavenger comprising 1,2-ethylene bis(oxyethylene) bis(3-(dodecylthio)propionate) or pentaerythritol tetra(3-mercaptopropionate), a multifunctional mercapto compound selected from 1,2-ethylene bis(oxyethylene) bis(3-(dodecylthio)propionate) or pentaerythritol tetra(3-mercaptopropionate), and an auxiliary scavenger, the auxiliary scavenger comprising trimethylolpropane triglycidyl ether.

[0017] Preferably, the reaction-inert barrier agent comprises a highly branched polyester amide or a hyperbranched polyglycidyl ether.

[0018] The present application also provides a method for preparing high-performance flame-retardant polyester yarn, for preparing the high-performance flame-retardant polyester yarn as described above, comprising the following steps: Flame retardant modification, reacting the base flame retardant with a modifier at 120-150°C under nitrogen protection for 3-5 hours to synthesize a modified silicon-based flame retardant; Master batch preparation, melt blending and granulating polyethylene terephthalate resin, 12-18% of the modified silicon-based flame retardant, reaction inhibitor, and processing aid according to the ratio, the melt temperature ≤ 270°C and the residence time ≤ 3 minutes; Spinning and oiling, melt spinning the polyethylene terephthalate chip with the master batch, and applying sulfur-containing silane oil to the surface of the fiber before winding; Post-processing, the oil-coated yarn cylinder is conditioned at 25°C / 65% RH for 24 hours, and then sealed and packaged under nitrogen protection.

[0019] The present application has the following beneficial effects: The present application solves the problem of poor shelf life of the escape blanket made of flame-retardant polyester yarn containing silicon-based flame retardant due to the sulfur-silicon exchange reaction between the silicon-based flame retardant in the flame-retardant polyester yarn and the sulfur-containing group after the oil-resistant treatment of the oil containing sulfur-containing silane coupling agent, first, a bulky tert-butyl phenyl steric group is grafted in the molecular chain of the silicon-based flame retardant to form a spatial barrier to increase the sulfur-silicon reaction energy barrier and directly block the nucleophilic attack of the thiol group on the Si-O bond, at the same time, N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexanediamine is added in the polyester matrix, the rigid piperidine ring produces steric hindrance, the secondary amine group dynamically captures free thiol to generate reversible thioamide, and dibutyltin dilaurate promotes the conversion of thiol to inert sulfide to achieve the improvement of the thiol removal rate of the fiber body, finally, the thiol scavenger is introduced into the oil to react with the -SH of the sulfur-containing silane to form a stable polysulfide network, and synergistically with trimethylolpropane triglycidyl ether to permanently block the residual active groups, and a highly branched polyester amide builds a thick and dense inert barrier on the surface of the fiber to physically isolate the reactants, significantly delaying the appearance time of harmful reactions to more than 1 year. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0021] Figure 1 The flowchart of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the present application are within the scope of the present application.

[0024] It should be noted that similar reference numerals and letters refer to like items in the accompanying drawings, and once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0025] In the description of the application, it needs to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0026] In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] In the description of the application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0028] A high-performance flame-retardant polyester filament includes a polyester base and a sulfur-containing silane coupling agent oil applied to the surface of the polyester base; The polyester base includes 80-86.5% polyethylene terephthalate resin, 12-18% modified silicon-based flame retardant, 0.5-2% reaction inhibitor, and 0.5-1.5% processing aid. The modified silicon-based flame retardant includes a compound of polysiloxane grafted bulky steric hindrance group, and the reaction inhibitor includes a 2,2,6,6-tetramethyl-4-piperidylamine derivative. Specifically, the modified silicon flame retardant includes a basic flame retardant and a modifier, the basic flame retardant adopts polydimethylsiloxane grafted polyphosphate P-DMS-g-PP or polymethylphenylsiloxane PMPS, the modifier includes a silane coupling agent derived from 3,5-di-tert-butyl-4-hydroxyphenyl propionate or tris(2,4-di-tert-butylphenyl) phosphite, the steric hindering group of the compound of polysiloxane grafted bulky steric hindering group is selected from 3,5-di-tert-butyl-4-hydroxyphenyl propionate or tris(2,4-di-tert-butylphenyl) phosphite, the reaction inhibitor includes N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine, the reaction inhibitor also includes a synergistic inhibitor, the synergistic inhibitor includes dibutyltin dilaurate or dibutyltin bis(acetylacetone) complex, and the processing aid includes an antioxidant and a lubricant.

[0029] The sulfur-containing silane coupling agent oil comprises 60-75% of a base lubricant, 5-15% of a sulfur-containing silane coupling agent, 3-8% of a mercaptan scavenger, 5-10% of a reaction inert barrier agent, 5-10% of an emulsifier, and 1-3% of an auxiliary agent.

[0030] Specifically, the base lubricant includes mineral oil, polyether, or high-viscosity dimethyl silicone oil, the sulfur-containing silane coupling agent includes γ-mercaptopropyltrimethoxysilane or bis-[3-(triethoxysilyl)propyl]tetrasulfide, the emulsifier includes a nonionic surfactant, the auxiliary agent includes a defoaming agent and a preservative, the thiol scavenger includes a multifunctional thiol compound, the thiol scavenger includes a main scavenger and an auxiliary scavenger, the main scavenger includes 1,2-ethylenebis(oxyethylene)bis(3-(dodecylthio)propionate) or pentaerythritoltetrakis(3-mercaptopropionate), the multifunctional thiol compound is selected from 1,2-ethylenebis(oxyethylene)bis(3-(dodecylthio)propionate) or pentaerythritoltetrakis(3-mercaptopropionate), the auxiliary scavenger includes trimethylolpropane triglycidyl ether, and the reaction inert barrier agent includes a highly branched polyester amide or a hyperbranched polyglycidyl ether.

[0031] The present invention also provides a method for preparing high-performance flame-retardant polyester yarn, such as Figure 1 As shown, the preparation of the high-performance flame-retardant polyester yarn as above includes the following steps: Flame retardant modification: react the base flame retardant with the modifier at 120-150°C under nitrogen protection for 3-5 hours to synthesize a modified silicon flame retardant; Preparation of masterbatch: polyethylene terephthalate resin, 12-18% modified silicon flame retardant, reaction inhibitor, and processing aid are melt-blended and granulated according to the proportion, with the melt temperature ≤ 270°C and the residence time ≤ 3 minutes; Spinning and oiling, melt spinning polyethylene terephthalate chip and master batch, and applying sulfur-containing silane oil agent to the surface of the fiber before winding; Post-processing, the oil-coated yarn tube is conditioned at 25℃ / 65%RH for 24 hours, sealed and packaged under nitrogen.

[0032] And the present application provides Example One: High-performance flame-retardant polyester yarn, comprising a polyester base and a sulfur-containing silane coupling agent oil agent applied to the surface of the polyester base.

[0033] The polyester base comprises 86.5% polyethylene terephthalate resin, 12% modified silicon-based flame retardant, 0.9% reaction inhibitor (0.8% TMPM-HDA and 0.1% synergistic inhibitor), and 0.6% processing aid.

[0034] The sulfur-containing silane coupling agent oil agent comprises 68% base lubricant, 10% sulfur-containing silane coupling agent, 8% mercaptan scavenger (6% main scavenger and 2% auxiliary scavenger), 8% reaction inert barrier agent, 5% emulsifier, and 1% auxiliary agent.

[0035] The sulfur-containing silane coupling agent oil agent is a fixed ratio.

[0036] And the present application provides Example Two: High-performance flame-retardant polyester yarn, comprising a polyester base and a sulfur-containing silane coupling agent oil agent applied to the surface of the polyester base.

[0037] The polyester base comprises 84% polyethylene terephthalate resin, 14% modified silicon-based flame retardant, 1.2% reaction inhibitor (1% TMPM-HDA and 0.2% synergistic inhibitor), and 0.8% processing aid.

[0038] The sulfur-containing silane coupling agent oil agent comprises 68% base lubricant, 10% sulfur-containing silane coupling agent, 8% mercaptan scavenger (6% main scavenger and 2% auxiliary scavenger), 8% reaction inert barrier agent, 5% emulsifier, and 1% auxiliary agent.

[0039] The sulfur-containing silane coupling agent oil agent is a fixed ratio.

[0040] And the present application provides Example Three: High-performance flame-retardant polyester yarn, comprising a polyester base and a sulfur-containing silane coupling agent oil agent applied to the surface of the polyester base.

[0041] The polyester base comprises 82% polyethylene terephthalate resin, 15% modified silicon-based flame retardant, 1.8% reaction inhibitor (1.5% TMPM-HDA and 0.3% synergistic inhibitor), and 1.2% processing aid.

[0042] The sulfur-containing silane coupling agent oil agent includes 68% of a base lubricant, 10% of a sulfur-containing silane coupling agent, 8% of a mercaptan scavenger (6% of a main scavenger and 2% of an auxiliary scavenger), 8% of a reaction inert barrier agent, 5% of an emulsifier, and 1% of an auxiliary agent.

[0043] The sulfur-containing silane coupling agent oil agent is a fixed ratio.

[0044] And the present application provides Example Four: The high-performance flame-retardant polyester filament includes a polyester base and a sulfur-containing silane coupling agent oil agent applied to the surface of the polyester base.

[0045] The polyester base includes 83.5% of a polyethylene terephthalate resin, 14.5% of a modified silicon flame retardant, 1.2% of a reaction inhibitor (1% of TMPM-HDA and 0.2% of a synergistic inhibitor), and 0.8% of a processing aid.

[0046] The sulfur-containing silane coupling agent oil agent includes 68% of a base lubricant, 10% of a sulfur-containing silane coupling agent, 8% of a mercaptan scavenger (6% of a main scavenger and 2% of an auxiliary scavenger), 8% of a reaction inert barrier agent, 5% of an emulsifier, and 1% of an auxiliary agent.

[0047] The sulfur-containing silane coupling agent oil agent is a fixed ratio.

[0048] And the present application provides Example Five: The high-performance flame-retardant polyester filament includes a polyester base and a sulfur-containing silane coupling agent oil agent applied to the surface of the polyester base.

[0049] The polyester base includes 81.5% of a polyethylene terephthalate resin, 16% of a modified silicon flame retardant, 1.5% of a reaction inhibitor (1.2% of TMPM-HDA and 0.3% of a synergistic inhibitor), and 0.9% of a processing aid.

[0050] The sulfur-containing silane coupling agent oil agent includes 68% of a base lubricant, 10% of a sulfur-containing silane coupling agent, 8% of a mercaptan scavenger (6% of a main scavenger and 2% of an auxiliary scavenger), 8% of a reaction inert barrier agent, 5% of an emulsifier, and 1% of an auxiliary agent.

[0051] The sulfur-containing silane coupling agent oil agent is a fixed ratio.

[0052] And the present application provides Example Six: The high-performance flame-retardant polyester filament includes a polyester base and a sulfur-containing silane coupling agent oil agent applied to the surface of the polyester base.

[0053] The polyester base includes 83% polyethylene terephthalate resin, 13.5% modified silicon flame retardant, 0.55% reaction inhibitor (0.5% TMPM-HDA and 0.05% synergistic inhibitor), and 0.95% processing aid.

[0054] The sulfur-containing silane coupling agent oil agent includes 68% base lubricant, 10% sulfur-containing silane coupling agent, 8% mercaptan scavenger (6% main scavenger and 2% auxiliary scavenger), 8% reaction inert barrier agent, 5% emulsifier, and 1% auxiliary agent.

[0055] The sulfur-containing silane coupling agent oil agent is a fixed ratio.

[0056] and the present application provides Example Seven: The high-performance flame-retardant polyester yarn includes a polyester base and a sulfur-containing silane coupling agent oil agent applied to the surface of the polyester base.

[0057] The polyester base includes 80% polyethylene terephthalate resin, 18% modified silicon flame retardant, 1.5% reaction inhibitor (1.2% TMPM-HDA and 0.3% synergistic inhibitor), and 0.5% processing aid.

[0058] The sulfur-containing silane coupling agent oil agent includes 68% base lubricant, 10% sulfur-containing silane coupling agent, 8% mercaptan scavenger (6% main scavenger and 2% auxiliary scavenger), 8% reaction inert barrier agent, 5% emulsifier, and 1% auxiliary agent.

[0059] The sulfur-containing silane coupling agent oil agent is a fixed ratio.

[0060] and the high-performance flame-retardant polyester yarns of Examples One to Seven are tested for delayed reflection by accelerated aging test under 60℃ / 75% RH conditions and SEM cross-section analysis of surface embrittlement layer thickness, tested for limiting oxygen index LOI by GB / T5455-2014 standard to reflect flame retardancy, tested for Martin Dale abrasion resistance for its wear resistance by ISO12947-3:1998 Martin Dale method for testing fabric abrasion resistance, tested for flying yarn rate by industrial spinning test, and tested for flame retardant shedding rate by ultrasonic dissolution-ashing method, wherein the shedding rate = ash content / theoretical weight of flame retardant*100%.

[0061] The test results are shown in the following table:

[0062] It can be seen that the high-performance flame-retardant polyester yarn of Example Three is the best performance ratio.

[0063] The high-performance flame-retardant polyester yarn solves the problem of poor shelf life of escape blankets caused by sulfur-silicon exchange reaction: First, the molecular structure of the silicon-based flame retardant body is modified. The bulky 3,5-di-tert-butyl-4-hydroxyphenyl propionate groups are grafted to the polydimethylsiloxane grafted polyphosphate P-DMS-g-PP backbone through a silane coupling agent. The steric hindrance effect of the bulky groups increases the reaction energy barrier of the thiol group attacking the siloxane bond, significantly reducing the reaction rate constant k value.

[0064] Meanwhile, N,N'-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexanediamine TMPM-HDA is precisely added to the polyester matrix as the main inhibitor. The rigid tetramethylpiperidine ring produces a steric shielding effect, and the secondary amine group can reversibly capture free thiols to form thioamides, which have a high dynamic passivation rate. In addition, dibutyltin dilaurate DBTL catalyzes the addition reaction of thiol and trace olefin / epoxy groups to convert active-SH to inert sulfide.

[0065] Finally, a double defense is constructed in the sulfur-containing silane oil system. Pentaerythritol tetra(3-mercaptopropionate) is used as the main scavenger of "sacrificial" multi-thiol, which preferentially reacts with the-SH of γ-mercaptopropyl trimethoxysilane KH590 to form a stable multi-sulfur network through intermolecular crosslinking, and then permanently passivates the residual thiol through the ring-opening reaction of the epoxy group of trimethylolpropane triglycidyl ether TMPTGE. The concentration of free-SH is reduced, and at the same time, the highly branched polyester amide HBPEA self-assembles into a dense physical barrier on the surface of the fiber, and the three-dimensional structure with a branching degree ≥0.4 effectively isolates the flame retardant and active substances.

[0066] Through the synergistic effect, the escape blanket made of high-performance flame-retardant polyester yarn can extend the shelf life to more than 1 year after light storage. SEM cross-sectional analysis shows that the embrittlement layer thickness is only 0.3 μm, the flame retardant shedding rate is as low as 4.3%, the limiting oxygen index LOI is 28.8%, and the Martindale abrasion resistance test shows that the abrasion resistance is improved by 52%, and the "flying silk" phenomenon is reduced. Breakthrough the limitation of the shelf life of traditional products of about 3 months, and provide durable and reliable protection for high-temperature emergency scenarios.

[0067] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high-performance flame-retardant polyester yarn, characterized in that: It includes a polyester matrix and a sulfur-containing silane coupling agent oil applied on the surface of the polyester matrix; The polyester matrix comprises 80-86.5% of polyethylene terephthalate resin, 12-18% of a modified silicon-based flame retardant, 0.5-2% of a reaction inhibitor, and 0.5-1.5% of a processing aid, wherein the modified silicon-based flame retardant comprises a compound having a polysiloxane grafted with a bulky steric hindered group, and the reaction inhibitor comprises a 2,2,6,6-tetramethyl-4-piperidinamine derivative; The sulfur-containing silane coupling agent oil comprises 60-75% of a base lubricant, 5-15% of a sulfur-containing silane coupling agent, 3-8% of a mercaptan scavenger, 5-10% of a reaction inert barrier agent, 5-10% of an emulsifier, and 1-3% of an auxiliary agent.

2. The high-performance flame-retardant polyester yarn according to claim 1, characterized in that: The modified silicon-based flame retardant includes a basic flame retardant and a modifier, wherein the basic flame retardant adopts polydimethylsiloxane grafted polyphosphate P-DMS-g-PP or polymethylphenylsiloxane PMPS, the modifier includes a silane coupling agent derived from 3,5-di-tert-butyl-4-hydroxyphenyl propionate or tris(2,4-di-tert-butylphenyl) phosphite, and the steric hindering group of the compound of the polysiloxane grafted bulky steric hindering group is selected from 3,5-di-tert-butyl-4-hydroxyphenyl propionate or tris(2,4-di-tert-butylphenyl) phosphite.

3. The high-performance flame-retardant polyester yarn according to claim 1, characterized in that: The reaction inhibitor includes N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine.

4. The high-performance flame-retardant polyester yarn according to claim 3, characterized in that: The reaction inhibitor further includes a synergistic inhibitor, which includes dibutyltin dilaurate or dibutyltin bis(acetylacetonate) complex.

5. The high-performance flame-retardant polyester yarn according to claim 1, characterized in that: The processing aids include antioxidants and lubricants.

6. The high-performance flame-retardant polyester yarn according to claim 1, characterized in that: The base lubricant includes mineral oil, polyether, or high-viscosity dimethyl silicone oil, the sulfur-containing silane coupling agent includes γ-mercaptopropyltrimethoxysilane or bis-[3-(triethoxysilyl)propyl]tetrasulfide, the emulsifier includes a nonionic surfactant, and the auxiliary agent includes a defoaming agent and a preservative.

7. The high-performance flame-retardant polyester yarn according to claim 1, characterized in that: The thiol scavenger includes a multifunctional mercapto compound.

8. The high-performance flame-retardant polyester yarn according to claim 7, characterized in that: The thiol scavenger includes a main scavenger and an auxiliary scavenger, the main scavenger includes 1,2-ethylenebis(oxyethylene)bis(3-(dodecylthio)propionate) or pentaerythritol tetrakis(3-mercaptopropionate), the multifunctional thiol compound is selected from 1,2-ethylenebis(oxyethylene)bis(3-(dodecylthio)propionate) or pentaerythritol tetrakis(3-mercaptopropionate), and the auxiliary scavenger includes trimethylolpropane triglycidyl ether.

9. The high-performance flame-retardant polyester yarn according to claim 1, characterized in that: The reaction inert barrier agent includes highly branched polyester amide or hyperbranched polyglycidyl ether.

10. A method for preparing high-performance flame-retardant polyester yarn, for preparing the high-performance flame-retardant polyester yarn according to claims 1-9, characterized in that: The steps include: Flame retardant modification: react the base flame retardant with the modifier at 120-150°C under nitrogen protection for 3-5 hours to synthesize a modified silicon flame retardant; Preparation of masterbatch: polyethylene terephthalate resin, 12-18% modified silicon flame retardant, reaction inhibitor, and processing aid are melt-blended and granulated according to the proportion, with the melt temperature ≤ 270°C and the residence time ≤ 3 minutes; Spinning oiling: melt spinning polyethylene terephthalate chips and masterbatch, and applying sulfur-containing silane oil to the fiber surface before winding; After treatment, the oiled silk drum is humidified at 25℃ / 65%RH for 24 hours and nitrogen-filled and sealed.

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