Flame-retardant polyester industrial yarn added with modified master batch on line

Abstract

The invention relates to a flame-retardant polyester industrial yarn added with modified master batch on line, which is characterized in that the variable coefficient of elongation at break is less than 4%; the breaking strength variation coefficient is smaller than 2.5%, and the limit oxygen index is larger than 28%; the raw materials of the flame-retardant polyester industrial yarn comprise rare earth modified master batches. The flame-retardant polyester industrial yarn provided by the invention has better flame retardance and strength stability.

Description

Technical Field

[0001] The present invention relates to the technical field of textile production, and specifically, it is a flame-retardant polyester industrial yarn with online addition of modified masterbatch.

Background Art

[0002] Flame-retardant polyester industrial yarns have important applications in many fields with high fire safety requirements due to their combination of high strength, weather resistance, and flame-retardant properties (achieved through modification or addition of flame retardants). The main uses include the following categories:

[0003] I. Industrial and Construction Fields

[0004] Firefighting and safety equipment: Used for making fire hoses, fire curtains, fire blankets, etc., to prevent the spread of fire or protect personnel and equipment in fire scenarios.

[0005] Flame-retardant sunshade nets and sound insulation and heat insulation materials for buildings (such as wall / roof filling layers) to meet building fire codes.

[0006] Industrial filtration and protection: Industrial dust filter bags in high-temperature environments (such as coal-fired power plants, steel mills), which can withstand dust friction and high temperatures, and at the same time prevent sparks from causing combustion.

[0007] Sealing materials for chemical equipment and anti-corrosion and flame-retardant conveyor belts, suitable for flammable and explosive chemical production environments.

[0008] II. Transportation and Traffic Fields

[0009] Automobile and rail transit interiors: Automobile seat fabrics, carpets, ceiling linings, dashboard covering materials, which can reduce the spread of smoke and flames during a fire and meet strict automotive safety standards (such as FMVSS 302).

[0010] Seat fabrics and luggage rack partitions for high-speed trains and aircraft interiors, meeting the flame-retardant and lightweight requirements of the aviation / railway industries.

[0011] Structural components of transportation vehicles: Tire cord fabrics (to enhance the strength of the tire carcass), brake pad linings, which can suppress the generation of open flames in scenarios where heat is generated by friction.

[0012] Flame-retardant canvas for ship ropes and lifeboats to ensure safety in offshore operations.

[0013] III. Safety Protection and Personal Equipment

[0014] Protective clothing and equipment: Industrial flame-retardant work clothes (such as in the oil, power, and metallurgy industries), which can resist the harm of electric arcs, sparks, or flames to the human body.

[0015] Safety belts, safety ropes, and parachute components, which have both high strength and flame retardancy to ensure reliability in critical situations.

[0016] Public safety supplies: Flame-retardant curtains and drapes in public places (such as shopping malls, cinemas) to reduce the fire risk; Signage materials for escape routes, which are flame-resistant and maintain visibility.

[0017] IV. Electronics and Electrical Field

[0018] Electrical insulation and cables: Insulating materials for motor windings, cable sheaths, to prevent fires caused by short circuits or overloads and meet the flame-retardant standards of the electrical industry (such as UL 94).

[0019] Reinforcing fibers inside the enclosures of electronic devices to enhance high-temperature resistance and flame-retardant properties.

[0020] Batteries and energy equipment: Packaging materials for lithium batteries, flame-retardant separators for energy storage devices, to inhibit the spread of fire during battery thermal runaway and ensure the safety of new energy equipment.

[0021] V. Other Special Applications

[0022] Outdoor and military equipment: Military tents, camouflage nets, bulletproof vest liners, to meet the fire protection and weather resistance requirements in complex environments.

[0023] Camping equipment (such as flame-retardant tent fabrics) to reduce the safety hazards of accidental fire sources such as campfires.

[0024] High-end packaging materials: Flame-retardant packaging fabrics, reinforcing fibers for transportation pallets for flammable and explosive items (such as chemicals, fireworks), to reduce storage and transportation risks.

[0025] The core advantages of flame-retardant polyester industrial yarn lie in "high strength + flame retardancy", so it is mainly applied to scenarios with extremely high requirements for fire safety and durability, covering multiple fields such as industrial manufacturing, transportation, construction, safety protection, electronics and electricity, and plays a key role especially in environments with potential fire risks.

[0026] The flame-retardant effect of polyester industrial yarn is usually achieved through the synergistic effect of a compound flame-retardant system, such as:

[0027] Phosphorus-halogen synergy: Phosphorus-based promotes char formation, and halogen-based inhibits free radicals. The combination of the two can act simultaneously in the gas phase and the condensed phase.

[0028] Phosphorus-nitrogen synergy: In a halogen-free flame-retardant system, phosphorus promotes carbonization, nitrogen expands to form carbon and releases non-combustible gases, reducing the generation of toxic gases, meeting environmental protection requirements.

[0029] Assisted by metal compounds: Antimony oxides (such as Sb2O3) synergize with halogen-based flame retardants to enhance the free radical capture ability; or metal oxides (such as ZnO, MgO) improve the stability of the carbon layer.

[0030] At present, Chinese Patent Publication No. CN108677269A relates to a production method of high-quality flame-retardant polyester industrial yarn, which includes drying of flame-retardant masterbatch, precise weighing and batching of flame-retardant masterbatch and high-viscosity chips, extrusion melting, metering, slow cooling, side blowing cooling, oiling, five-pair roll stretching and setting, texturing, and winding and forming. However, its flame-retardant masterbatch uses a phosphorus-based flame retardant as a modifier (mainly copolymer addition of CEPPA), and uses the phosphorus-containing groups of the phosphorus-based flame retardant to generate a large amount of combustion heat during the combustion process, causing the polyester to melt, reducing the flow viscosity to produce molten dripping, taking away heat, and using the free radical capture effect of the phosphorus-containing flame retardant to extinguish the flame, achieving the flame-retardant purpose, and its flame-retardant mechanism is heat removal by molten dripping for flame retardancy.

[0031] Chinese Patent Publication No. CN110158188A relates to a preparation method of high-strength flame-retardant polyester industrial yarn, which is characterized by including the following steps:

[0032] (1) Raw material selection

[0033] Component A: high molecular weight phosphorus-based flame retardant, with specific parameters: molecular weight 40,000 - 100,000, phosphorus content: 8 - 12%, Tg; 100 - 105 °C;

[0034] Mix component A with fiber-grade PET chips, and the mass ratio of component A in the mixed raw materials is: 5 - 10%; among them, the intrinsic viscosity of the fiber-grade PET chips is: 0.66 - 0.68 dl / g; the mass content of COOH is 24 - 32 mol / ton; the mass content of DEG is 0.8 - 1.0%;

[0035] (2) Solid-phase viscosity increase: The mixed materials in step (1) are dried and preheated in a continuous solid-phase viscosity increase device or a rotary drum, and solid-phase viscosity increase is carried out until the intrinsic viscosity of the mixed materials after treatment is 1.0 - 1.20 dl / g of high-viscosity PET flame-retardant chips;

[0036] (3) Melting process: The raw materials polymerized in solid phase in step (2) are heated and melted in the range of 265 °C - 310 °C under N2 protection, and then enter the spinning box body, and the temperature of the spinning box body is controlled at 265 - 310 °C;

[0037] (4) Metering and spinning process: The fully melted melt is spun through a metering pump;

[0038] (5) Cooling and forming: The spun yarn ejected from the spinneret holes is cooled into a filament bundle by side blowing, and the temperature of the cooling air is controlled at 18 - 25 °C;

[0039] (6) Stretching process: The cooled filament bundle is stretched and heat-set, with a total stretching ratio of 5 - 7 and a setting temperature of 200 °C - 230 °C;

[0040] (7) Winding process: control the winding speed at 2200 m / min to 4000 m / min.

[0041] Among them, the polymer phosphorus-based flame retardant is formed by grafting one or more of copolyphosphonate carbonate, polyphosphonate, and copolyphosphonate onto the PET molecular chain.

[0042] This application takes a different approach. By designing a rare earth flame retardant system, while maintaining the mechanical strength performance of polyester industrial yarn, it achieves an efficient flame retardant effect and meets the actual production application.

Summary of the Invention

[0043] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a flame retardant polyester industrial yarn with an online added modified masterbatch.

[0044] The purpose of the present invention is achieved through the following technical solutions:

[0045] A flame retardant polyester industrial yarn with an online added modified masterbatch, the coefficient of variation of its elongation at break is less than 4%; the coefficient of variation of breaking strength is less than 2.5%, and the limiting oxygen index is greater than 28%;

[0046] The raw materials of the flame retardant polyester industrial yarn include a rare earth modified masterbatch.

[0047] The coefficient of variation of the elongation at break of the flame retardant polyester industrial yarn is less than 2%.

[0048] The coefficient of variation of the breaking strength of the flame retardant polyester industrial yarn is less than 1.5%.

[0049] The limiting oxygen index of the flame retardant polyester industrial yarn is greater than 30%.

[0050] The limiting oxygen index of the flame retardant polyester industrial yarn is greater than 32%.

[0051] A rare earth modified masterbatch, the mass percentage of its raw materials is:

[0052]

[0053] Modified LDH: Mix the layered double hydroxide LDH powder and the rare earth carboxylate coupling agent in a mass ratio of 100:3 to 100:5, and treat them in a high-speed mixer at 80 - 85 °C for 30 - 60 minutes to obtain modified LDH. Mainly make the coupling agent combine with the surface hydroxyl groups of LDH through ion exchange, and the rare earth carboxylate coupling agent, such as cerium tristearate, etc.

[0054] The stabilizer is tris(2,4-di-tert-butylphenyl) phosphite.

[0055] The dispersant is vinyl bisstearamide and the like.

[0056] The mass fraction of CeO2 in the rare earth modified masterbatch is 11-13%.

[0057] The mass fraction of the modified LDH in the rare earth modified masterbatch is 34-36%.

[0058] A granulation method for a rare earth modified masterbatch, the specific steps are as follows:

[0059] Add various raw materials to a twin-screw extruder, melt and blend at 250-260 °C, the screw speed is 250-300 revolutions per minute, the residence time is 5-8 minutes, and finally cut the material to obtain the rare earth modified masterbatch; and control the moisture content to be less than 50 ppm.

[0060] A flame-retardant polyester industrial yarn with online addition of a modified masterbatch is melt-spun by means of in-line injection through a pipeline; specifically, the rare earth modified masterbatch is used as the raw material for pipeline injection, and the conventional polyester melt is used as the main melt. The melt of the rare earth modified masterbatch is injected into the main melt through a pipeline injection system, then mixed through a pipeline static mixer, then transported through a melt pipeline, filtered before spinning, and then enters the spinning assembly for melt spinning. After cooling by ring blowing, oiling, drawing, and winding, a flame-retardant polyester industrial yarn with in-line addition of a modified masterbatch is obtained;

[0061] The mass ratio of the rare earth modified masterbatch to the conventional polyester melt is 1:15-1:20;

[0062] The winding speed of the melt direct spinning in-line addition colored yarn is 4200-4400 m / min, the ring blowing wind speed is 0.38-0.58 m / min, the ring blowing temperature is 25-28 °C, the length of the ring blowing cylinder is 120-165 cm, the drawing is divided into pre-drawing and main drawing, the pre-drawing multiple is 2.5-3.5 times, and the main drawing is 3.5-4.5 times.

[0063] This application uses an in-line addition pump-front injection device, which not only plays an in-line addition and modification role in large-capacity polyester polymerization, but also meets the modification of small-batch and multi-batch products. At the same time, because the injected functional melt stays in the pipeline for a short time, there is less degradation and the impact on the main melt is lower, which can improve the quality of polyester products.

[0064] Compared with the prior art, the positive effects of the present invention are:

[0065] The CeO2 in this application catalyzes the polyester to form a dense carbon layer (the carbon residue increases from 12% to 25%), and the MgO / Al2O3 generated by the decomposition of LDH fills the pores of the carbon layer to form a "ceramicized" protective layer, effectively blocking the transfer of heat and oxygen.

[0066] The CO2 and H2O generated by the decomposition of LDH in this application dilute the concentration of combustible gases, and CeO2 inhibits the gas-phase combustion chain reaction by capturing free radicals (such as -OH, -H).

Specific Embodiments

[0067] The following provides specific embodiments of a flame-retardant polyester industrial yarn with an online-added modified masterbatch according to the present invention.

[0068] Example 1

[0069] A rare-earth modified masterbatch, the mass percentages of its raw materials are as follows:

[0070]

[0071] Modified LDH: The layered double hydroxide LDH powder is mixed with a rare-earth carboxylate coupling agent at a mass ratio of 100:3 to 100:5, and processed in a high-speed mixer at 80 - 85 °C for 30 - 60 minutes to obtain modified LDH. Mainly, the coupling agent binds to the surface hydroxyl groups of LDH through ion exchange. The rare-earth carboxylate coupling agent is, for example, cerium tristearate, etc.

[0072] The stabilizer is tris(2,4-di-tert-butylphenyl) phosphite.

[0073] The dispersant is an analogue such as vinyl bisstearamide.

[0074] The layered double hydroxide LDH powder is purchased from Xianfeng Nanomaterials Co., Ltd., specifically MgAl-LDH with a platelet diameter of 10 microns.

[0075] A granulation method for a rare-earth modified masterbatch, the specific steps are as follows:

[0076] Add various raw materials into a twin-screw extruder, melt and blend at 250 - 260 °C, with a screw speed of 250 - 300 revolutions per minute and a residence time of 5 - 8 minutes, and finally cut the material to obtain the rare-earth modified masterbatch; and control the moisture content to be less than 50 ppm.

[0077] A flame-retardant polyester industrial yarn with an online-added modified masterbatch is melt-spun by the method of injecting through a pipeline in the melt direct spinning process; specifically, the rare-earth modified masterbatch is used as the raw material for pipeline injection, and the conventional polyester melt is used as the main melt. The rare-earth modified masterbatch melt is injected into the main melt through a pipeline injection system, then mixed through a pipeline static mixer, then transported through a melt pipeline, and then filtered before spinning, and enters the spinning pack to carry out melt spinning. After cooling by ring blowing, oiling, drawing, and winding, the flame-retardant polyester industrial yarn with an online-added modified masterbatch is obtained;

[0078] The mass ratio of the rare-earth modified masterbatch to the conventional polyester melt is 1:15;

[0079] The winding speed of the melt direct spinning with online addition of colored filaments is 4,250 m / min, the air speed of the ring blower is 0.38 - 0.58 m / min, the temperature of the ring blower is 25 - 28 °C, the length of the ring blower barrel is 120 - 165 cm. The stretching is divided into pre-stretching and main stretching. The multiple of pre-stretching is 2.7 times, and the multiple of main stretching is 3.8 times.

[0080] In this application, by means of the online addition pump front injection device, it not only realizes the online addition and modification of large-capacity polyester polymerization, but also meets the modification of small-batch and multi-batch products. At the same time, since the functional melt injected stays in the pipeline for a short time, there is less degradation and the impact on the main melt is low, which can improve the quality of polyester products.

[0081] The limiting oxygen index of the flame-retardant polyester industrial yarn with melt direct spinning and online addition of modified masterbatch in Example 1 is 31%.

[0082] The coefficient of variation of the elongation at break of the flame-retardant polyester industrial yarn with melt direct spinning and online addition of modified masterbatch in Example 1 is 3.8%; the coefficient of variation of the breaking strength is 2.3%.

[0083] Example 2

[0084] A rare earth modified masterbatch, the mass percentage of its raw materials is as follows:

[0085]

[0086] Modified LDH: Mix the layered double hydroxide LDH powder and the rare earth carboxylate coupling agent in a mass ratio of 100:3 - 100:5, and process at 80 - 85 °C for 30 - 60 minutes in a high-speed mixer to obtain modified LDH. The main purpose is to make the coupling agent combine with the surface hydroxyl groups of LDH through ion exchange. The rare earth carboxylate coupling agent is, for example, cerium tristearate, etc.

[0087] The stabilizer is tris(2,4-di-tert-butylphenyl) phosphite.

[0088] The dispersant is vinyl bisstearamide and analogues thereof.

[0089] A granulation method for a rare earth modified masterbatch, the specific steps are as follows:

[0090] Add various raw materials into a twin-screw extruder, melt and blend at 250 - 260 °C, the screw speed is 250 - 300 rpm, the residence time is 5 - 8 minutes, and finally cut the material to obtain the rare earth modified masterbatch; and control the moisture content to be less than 50 ppm.

[0091] A flame-retardant polyester industrial yarn with modified masterbatch added online is melt-spun by means of direct melt spinning with online addition through a pipeline injection method; specifically, a rare-earth modified masterbatch is used as the raw material for pipeline injection, and a conventional polyester melt is used as the main melt. The rare-earth modified masterbatch melt is injected into the main melt through a pipeline injection system, then mixed through a pipeline static mixer, transported through a melt pipeline, filtered before spinning, and then enters the spinning assembly for melt spinning. After cooling by ring blowing, oiling, drawing, and winding, the flame-retardant polyester industrial yarn with modified masterbatch added online by direct melt spinning is obtained;

[0092] The mass ratio of the rare-earth modified masterbatch to the conventional polyester melt is 1:17;

[0093] The winding speed of the melt-spun online-added colored yarn is 4300 m / min, the ring blowing wind speed is 0.38 - 0.58 m / min, the ring blowing temperature is 25 - 28 °C, the length of the ring blowing cylinder is 120 - 165 cm, the drawing is divided into pre-drawing and main drawing, the multiple of pre-drawing is 2.8 times, and the main drawing is 4 times.

[0094] The limiting oxygen index of the flame-retardant polyester industrial yarn with modified masterbatch added online in this Example 2 is 33%;

[0095] The coefficient of variation of the elongation at break of the flame-retardant polyester industrial yarn with modified masterbatch added online in this Example 2 is 3.0%; the coefficient of variation of the breaking strength is 1.8%.

[0096] Example 3

[0097] A rare-earth modified masterbatch, the mass percentage of its raw materials is:

[0098]

[0099] Modified LDH: The layered double hydroxide LDH powder is mixed with a rare-earth carboxylate coupling agent in a mass ratio of 100:3 - 100:5, and processed in a high-speed mixer at 80 - 85 °C for 30 - 60 minutes to obtain modified LDH. The main purpose is to make the coupling agent combine with the surface hydroxyl groups of LDH through ion exchange. The rare-earth carboxylate coupling agent is, for example, cerium tristearate, etc.

[0100] The stabilizer is tris(2,4-di-tert-butylphenyl) phosphite.

[0101] The dispersant is vinyl bisstearamide and other analogues.

[0102] A granulation method for a rare-earth modified masterbatch, the specific steps are as follows:

[0103] Add various raw materials into a twin-screw extruder, melt and blend them at 250 - 260 °C, with the screw speed of 250 - 300 revolutions per minute and the residence time of 5 - 8 minutes, and finally cut the materials to obtain the rare-earth modified masterbatch; and control the moisture content to be less than 50 ppm.

[0104] A flame-retardant polyester industrial yarn with online addition of modified masterbatch is melt-spun by the method of injecting through a pipeline in melt direct spinning; specifically, the rare-earth modified masterbatch is used as the raw material for pipeline injection, and the conventional polyester melt is used as the main melt. The melt of the rare-earth modified masterbatch is injected into the main melt through a pipeline injection system, then mixed through a pipeline static mixer, then transported through a melt pipeline, then filtered before spinning, and then enters the spinning assembly for melt spinning. After cooling by ring blowing, oiling, drawing, and winding, the flame-retardant polyester industrial yarn with online addition of modified masterbatch in melt direct spinning is obtained;

[0105] The mass ratio of the rare-earth modified masterbatch to the conventional polyester melt is 1:19;

[0106] The winding speed of the melt direct spinning online addition colored yarn is 4350 meters per minute, the ring blowing wind speed is 0.38 - 0.58 meters per minute, the ring blowing temperature is 25 - 28 °C, the length of the ring blowing air duct is 120 - 165 cm, the drawing is divided into pre-drawing and main drawing, the multiple of pre-drawing is 3 times, and the main drawing is 4 times.

[0107] The limiting oxygen index of the flame-retardant polyester industrial yarn with online addition of modified masterbatch in this Example 3 is 36%.

[0108] The coefficient of variation of the elongation at break of the flame-retardant polyester industrial yarn with online addition of modified masterbatch in this Example 3 is 2.2%; the coefficient of variation of the breaking strength is 1.1%.

[0109] Comparative Example 1

[0110] A rare-earth modified masterbatch, the mass percentage of its raw materials is:

[0111]

[0112] Modified LDH: Mix the layered double hydroxide LDH powder and the rare-earth carboxylate coupling agent according to the mass ratio of 100:3 - 100:5, and treat them in a high-speed mixer at 80 - 85 °C for 30 - 60 minutes to obtain the modified LDH. The main purpose is to make the coupling agent combine with the surface hydroxyl groups of LDH through ion exchange. The rare-earth carboxylate coupling agent is, for example, cerium tristearate, etc.

[0113] The stabilizer is tris(2,4-di-tert-butylphenyl) phosphite.

[0114] The dispersant is vinyl bisstearamide and other similar substances.

[0115] A granulation method for rare earth modified masterbatch, and its specific steps are as follows:

[0116] Add various raw materials into a twin-screw extruder, melt and blend at 250 - 260 °C, with the screw speed of 250 - 300 revolutions per minute, residence time of 5 - 8 minutes, and finally cut the material to obtain the rare earth modified masterbatch; and control the moisture content to be less than 50 ppm.

[0117] A flame-retardant polyester industrial yarn with online addition of modified masterbatch adopts the method of melt direct spinning with online addition by pipeline injection for melt spinning; specifically, using the rare earth modified masterbatch as the raw material for pipeline injection, and the conventional polyester melt as the main melt, the melt of the rare earth modified masterbatch is injected into the main melt through the pipeline injection system, then mixed through a pipeline static mixer, then transported through the melt pipeline, then filtered before spinning, and then enters the spinning assembly for melt spinning, cooled by ring blowing, oiled, drawn, and wound to obtain the flame-retardant polyester industrial yarn with online addition of modified masterbatch by melt direct spinning;

[0118] The mass ratio of the described rare earth modified masterbatch to the conventional polyester melt is 1:17;

[0119] The winding speed of the melt direct spinning online added colored yarn is 4300 m / min, the ring blowing wind speed is 0.38 - 0.58 m / min, the ring blowing temperature is 25 - 28 °C, the length of the ring blowing cylinder is 120 - 165 cm, the drawing is divided into pre-drawing and main drawing, the multiple of pre-drawing is 2.8 times, and the main drawing is 4 times.

[0120] The limiting oxygen index of the flame-retardant polyester industrial yarn with online addition of modified masterbatch in this Comparative Example 1 is 22%.

[0121] The coefficient of variation of the elongation at break of the flame-retardant polyester industrial yarn with online addition of modified masterbatch in Comparative Example 1 is 3.9%; the coefficient of variation of the breaking strength is 2.7%.

[0122] Comparative Example 2

[0123] A rare earth modified masterbatch, and its mass percentage of raw materials is:

[0124]

[0125] Modified LDH: Mix the layered double hydroxide LDH powder and the rare earth carboxylate coupling agent according to the mass ratio of 100:3 - 100:5, and treat at 80 - 85 °C for 30 - 60 minutes in a high-speed mixer to obtain the modified LDH. Mainly make the coupling agent combine with the surface hydroxyl groups of LDH through ion exchange, and the rare earth carboxylate coupling agent, such as cerium tristearate, etc.

[0126] The stabilizer is tris(2,4-di-tert-butylphenyl) phosphite.

[0127] The dispersant is vinyl bisstearamide and the like.

[0128] A granulation method for a rare earth modified masterbatch, the specific steps of which are as follows:

[0129] Add various raw materials into a twin-screw extruder, melt and blend at 250-260 °C, the screw speed is 250-300 revolutions per minute, the residence time is 5-8 minutes, and finally cut the material to obtain a rare earth modified masterbatch; and control the moisture content to be less than 50 ppm.

[0130] A flame-retardant polyester industrial yarn with online addition of modified masterbatch is melt-spun by means of melt direct spinning and online addition through a pipeline injection method; specifically, the rare earth modified masterbatch is used as the raw material for pipeline injection, and the conventional polyester melt is used as the main melt. The rare earth modified masterbatch melt is injected into the main melt through a pipeline injection system, then mixed through a pipeline static mixer, then transported through a melt pipeline, then filtered before spinning, and then enters the spinning assembly for melt spinning. After cooling by ring blowing, oiling, drawing, and winding, a flame-retardant polyester industrial yarn with online addition of modified masterbatch by melt direct spinning is obtained;

[0131] The mass ratio of the rare earth modified masterbatch to the conventional polyester melt is 1:17;

[0132] The winding speed of the melt direct spinning online addition colored yarn is 4300 m / min, the ring blowing wind speed is 0.38-0.58 m / min, the ring blowing temperature is 25-28 °C, the length of the ring blowing cylinder is 120-165 cm, the drawing is divided into pre-drawing and main drawing, the multiple of pre-drawing is 2.8 times, and the main drawing is 4 times.

[0133] The limiting oxygen index of the flame-retardant polyester industrial yarn with online addition of modified masterbatch in Comparative Example 2 is 23%.

[0134] The coefficient of variation of the elongation at break of the flame-retardant polyester industrial yarn with online addition of modified masterbatch in Comparative Example 2 is 4.7%; the coefficient of variation of the breaking strength is 3.1%.

[0135] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A flame-retardant polyester industrial yarn with online addition of modified masterbatch, characterized in that: The coefficient of variation of its elongation at break is less than 4%; the coefficient of variation of breaking strength is less than 2.5%, and the limiting oxygen index is greater than 28%; The raw materials of flame retardant polyester industrial yarn include rare earth modified masterbatch.

2. The flame-retardant polyester industrial yarn with online modified masterbatch addition as claimed in claim 1, characterized in that: The coefficient of variation of the elongation at break of the flame retardant polyester industrial yarn is less than 2%.

3. The flame-retardant polyester industrial yarn with online modified masterbatch addition as claimed in claim 1, characterized in that: The coefficient of variation of breaking strength of flame-retardant polyester industrial yarn is less than 1.5%.

4. The flame-retardant polyester industrial yarn with online modified masterbatch addition as claimed in claim 1, characterized in that: The limiting oxygen index of flame retardant polyester industrial yarn is greater than 30%.

5. The flame-retardant polyester industrial yarn with online modified masterbatch addition as claimed in claim 1, characterized in that: The limiting oxygen index of flame retardant polyester industrial yarn is greater than 32%.

6. The flame-retardant polyester industrial yarn with online modified masterbatch addition as claimed in claim 1, characterized in that: Rare earth modified masterbatch, the raw material mass percentage is:

7. The flame-retardant polyester industrial yarn with online addition of modified masterbatch as claimed in claim 6, characterized in that: Modified LDH: Layered double hydroxide LDH powder and rare earth carboxylate coupling agent are mixed at a mass ratio of 100:3 to 100:5, and treated in a high-speed mixer at 80 to 85° C. for 30 to 60 minutes to obtain modified LDH.

8. The flame-retardant polyester industrial yarn with online addition of modified masterbatch as claimed in claim 6, characterized in that: The stabilizer is tris(2,4-di-tert-butylphenyl) phosphite.

9. The flame-retardant polyester industrial yarn with online addition of modified masterbatch according to claim 6, characterized in that: The mass fraction of CeO2 in the rare earth modified masterbatch is 11-13%.

10. The flame-retardant polyester industrial yarn with online modified masterbatch addition as claimed in claim 6, characterized in that: The mass fraction of the modified LDH in the rare earth modified masterbatch is 34-36%.

Images