High modulus aramid 1414 fiber for optical cable and preparation method thereof

Abstract

The application provides a high modulus type aramid fiber 1414 for optical cable and a preparation method thereof, and belongs to the technical field of optical cable. The application adopts conventional technology to obtain aramid fiber 1414 original wire; the aramid fiber 1414 original wire with a fineness of 1500-6000D, a moisture content of 20-30% and an elastic modulus of 110-130Gpa is selected to perform first oiling, heat treatment, second oiling and winding, wherein the temperature and tension in the heat treatment process are controlled, finally, the high modulus type aramid fiber 1414 for optical cable with a breaking strength of 18.0-20.0cN / dtex, an elastic modulus of 110-130Gpa, a breaking elongation of 2.0-3.2% and a moisture content of 3.0-7.0% is obtained, meanwhile, the large-scale production of the high modulus type aramid fiber 1414 for optical cable is realized, the production efficiency is effectively improved, the production value is increased, and energy saving and emission reduction are achieved.

Description

Technical Field

[0001] This invention relates to an aramid 1414 fiber and its preparation method, specifically to a high-modulus aramid 1414 fiber for optical cables and its preparation method, belonging to the field of optical cable technology. Background Technology

[0002] Aramid 1414, officially known as poly(p-phenylene terephthalamide), is a synthetic fiber with excellent properties such as high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight. Its strength is 5-6 times that of steel wire, its modulus is 2-3 times that of steel wire, and its toughness is twice that of steel wire, while its weight is only 1 / 5 that of steel wire. It does not decompose or melt below 560℃. Aramid products are mainly used in bulletproof vests, helmets, aerospace materials, optical cable reinforcement materials, sports materials, tire frame materials, and conveyor belt materials. Aramid 1414 products are classified according to their mechanical properties, including: general performance products, medium modulus products, high modulus products, and high strength products. Among them, high strength and high modulus products are considered high-end products within the aramid 1414 fiber category.

[0003] With the increasing development of optical fiber communication and the widespread application of optical cables, two protective and tensioning elements are needed to ensure that brittle silica optical fibers are not damaged during construction and operation: high-modulus aramid 1414 fiber and braided fabric. Currently, my country uses over 1,000 tons of high-modulus aramid II products for optical cables annually, accounting for about one-third of aramid products. However, the existing high-modulus aramid 1414 fiber is mainly supplied by DuPont and Teijin, and there is no large-scale domestic production of high-modulus aramid 1414 fiber products; it relies heavily on imports.

[0004] Existing technology CN114808451A discloses "a method for preparing high-modulus aramid 1414 fiber," which involves segmented heating and oiling in the post-processing stage. First, a drying stage removes most of the moisture from the nascent fiber, facilitating the penetration of the oil agent into the fiber during the first oiling process. This promotes the orientation movement of the molecular chains during subsequent hot stretching, resulting in high-modulus aramid fiber with a modulus higher than 800 g / d. Furthermore, this process eliminates the need for high-temperature treatment. This process avoids the need for strong stretching, solving the problems of fiber breakage and poor production stability. Similarly, CN217266162U discloses "a spinning production line for high-modulus aramid 1414 fiber," which also addresses the problems of fiber breakage and poor production stability in the preparation of high-modulus aramid 1414 fiber in existing technologies.

[0005] Therefore, there is an urgent need for a large-scale, systematic method for preparing high-modulus aramid 1414 fibers. Summary of the Invention

[0006] This invention aims to overcome the shortcomings of existing technologies and proposes a high-modulus aramid 1414 fiber for optical cables and its preparation method. Specifically, based on a specific preparation method—two-stage oiling and zoned heat treatment—not only can a high-modulus aramid 1414 fiber for optical cables be obtained, but it also fills the gap in large-scale production, broadens the application market for aramid fibers, and forms a series of aramid fiber products.

[0007] To achieve the above technical objectives, the following technical solution is proposed:

[0008] The primary objective of this technical solution is to provide: a high-modulus aramid 1414 fiber for optical cables, which is prepared by mixing and dissolving poly(p-phenylene terephthalamide) resin (PPTA) and sulfuric acid as raw materials, followed by degassing and filtration, spinning, washing, drying, offline heat treatment or online heat treatment;

[0009] The performance indicators of the high-modulus aramid 1414 fiber for optical cables include:

[0010] Fracture strength: 18.0-20.0 cN / dtex;

[0011] Elastic modulus: 110-130 GPa;

[0012] Elongation at break: 2.0-3.2%;

[0013] Moisture content: 3.0-7.0%.

[0014] The second objective of this technical solution is to provide a method for preparing high-modulus aramid 1414 fiber for optical cables, comprising the following steps:

[0015] S1: Preparation of Aramid 1414 precursor yarn

[0016] Poly(p-phenylene terephthalamide) resin and sulfuric acid are mixed and dissolved, defoamed, filtered, spun, washed and dried to obtain aramid 1414 precursor yarn with a fineness of 1500-6000D, a moisture content of 20-30% and an elastic modulus of 110-130Gpa.

[0017] S2: First oiling

[0018] The aramid 1414 precursor yarn was placed on oiling machine I, and the oil content of the aramid 1414 precursor yarn was controlled to be 0.4±0.2%.

[0019] S3: Heat treatment

[0020] After the first oiling, the aramid 1414 raw yarn is placed in a heat treatment machine and sequentially passed through the heat treatment zone for stretching, the spray zone for spraying, and the cold roller zone for heat setting to obtain aramid 1414 yarn.

[0021] Specifically, the temperature of the heat treatment zone is controlled at 220-360℃, the tension between the dryer and the heat treatment zone is 1.2-3.5 g / d, and the tension between the heat treatment zone and the cold roller zone is 1.5-3.5 g / d.

[0022] S4: Second oiling

[0023] The aramid 1414 yarn was placed on oiling machine II, and the oil content of the aramid 1414 yarn was controlled to be 1.4±0.4%.

[0024] S5: Winding

[0025] The aramid 1414 filaments after the second oiling are wound by a winding machine to obtain high-modulus aramid 1414 fiber for optical cables with an elastic modulus of 110-130 Gpa.

[0026] Furthermore, the material conveying rate inside the heat treatment machine is 330-370 m / min, and the stretching time in the heat treatment zone is 0.7-1.2 s.

[0027] Furthermore, the heat treatment zone includes heat treatment zone I and heat treatment zone II, and the cold roller zone includes cold roller zone I and cold roller zone II. The temperature of heat treatment zone I is 220-240℃, and the stretching time is 0.3-0.5s; the temperature of heat treatment zone II is 320-360℃, and the stretching time is 0.55-0.7s; the tension between the dryer and heat treatment zone I is 1.2-1.5g / d, the tension between heat treatment zone I and heat treatment zone II is 2.5-3.5g / d, and the tension between heat treatment zone II and cold roller zone I is 1.5-3.5g / d.

[0028] The third objective of this technical solution is to provide: a preparation system for high-modulus aramid 1414 fiber for optical cables, including a solution preparation device, a degassing device, a filtering device, a spinning device, a washing device, a dryer, an oiling machine I, a heat treatment device, an oiling machine II, and a winding device. The solution preparation device, the degassing device, the filtering device, the spinning device, the washing device, and the dryer are connected in sequence, and a continuous path for preparing aramid 1414 precursor yarn is formed between the solution preparation device, the degassing device, the filtering device, the spinning device, the washing device, and the dryer.

[0029] Oiling machine I is located behind the dryer's workstation, heat treatment device is located behind the oiling machine I's workstation, oiling machine II is located behind the heat treatment device's workstation, and winding device is located behind the oiling machine II's workstation. The dryer, oiling machine I, heat treatment device, oiling machine II, and winding device form a continuous path for preparing high-modulus aramid 1414 fibers for optical cables.

[0030] Furthermore, the heat treatment device includes a heat treatment zone, a spray zone, and a cold roller zone. The heat treatment zone is equipped with multiple stretching rollers, the spray zone is equipped with a spraying mechanism, and the cold roller zone is equipped with multiple heat setting rollers. A continuous passage for material stretching, spraying, and heat setting is formed between the stretching rollers, the spraying mechanism, and the heat setting rollers.

[0031] Furthermore, the heat treatment zone includes heat treatment zone I and heat treatment zone II. Heat treatment zone I is provided with six stretching rollers, and heat treatment zone II is provided with eight stretching rollers. The stretching rollers in heat treatment zone I are distributed on one side of the stretching rollers in heat treatment zone II.

[0032] Furthermore, the cold roll area includes cold roll area I and cold roll area II. Cold roll area I is provided with four heat setting rollers, and cold roll area II is provided with four heat setting rollers. The heat setting rollers in cold roll area I are distributed on one side of the heat setting rollers in cold roll area II.

[0033] The technological mechanisms underlying this technical solution include:

[0034] From a microscopic perspective, para-aramid (aramid 1414) has a fibrous structure composed of microfibrils with diameters ranging from 20-50 nm distributed along the fiber axis, featuring a highly oriented skin and a relatively poorly oriented fiber core. From a macroscopic perspective, para-aramid possesses a divergent microfibril sheet structure, with a fold every 600 nm perpendicular to the fiber axis. Undried para-aramid has a structure saturated with water; with water acting as a lubricating medium, the microfibrils will slip and be straightened under stress. Therefore, when undried fibers are subjected to circumferential tension, the microstructure deforms, increasing the crystal orientation of the fiber core without damaging the macrostructure. The sustained circumferential stretching process gradually eliminates the folded sheet structure, simultaneously increasing fiber strength and modulus. In contrast, dry fibers with a water-free collapse microstructure can only undergo a certain degree of core-pulling stretching and orientation before further damage to the microstructure occurs, resulting in increased fiber modulus but significantly decreased strength.

[0035] Therefore, this technical solution utilizes the mechanism that wet fibers undergo microstructural changes under the tension of annular rollers, thereby increasing the modulus of para-aramid without sacrificing strength. It proposes a high-modulus aramid 1414 fiber for optical cables and its preparation method.

[0036] In this technical solution, the terms and definitions involved include:

[0037] Elongation at break: The ratio of the length of the specimen elongated under the action of the breaking force to its initial length, expressed as a percentage;

[0038] Fracture strength: The property of a unit linear density to resist deformation under external force;

[0039] Elastic modulus: The maximum slope of the unit load-elongation curve in the elastic region under unconfined compression.

[0040] The principles underlying the determination of the aforementioned mechanical properties include:

[0041] The specimen is stretched until it breaks to obtain the breaking strength and elongation. The breaking strength is calculated from the breaking strength and linear density. At the same time, the maximum slope of the unit load-elongation curve in the elastic region is obtained to obtain the tensile elastic modulus. The chord modulus, constant elongation force, and constant force elongation are calculated from the load-elongation curve.

[0042] In this technical solution, the positional relationships involved, such as "inside", "behind the workstation", and "between", are defined according to the actual usage conditions and are common terms in this technical field, as well as common terms used by those skilled in the art in actual use.

[0043] The beneficial technical effects of adopting this technical solution are as follows:

[0044] This invention not only yields high-modulus aramid 1414 fiber for optical cables, with a breaking strength of 18.0-20.0 cN / dtex, an elastic modulus of 110-130 GPa, an elongation at break of 2.0-3.2%, and a moisture content of 3.0-7.0%, but also enables large-scale production, effectively improving production efficiency, increasing output value, and contributing to energy conservation and emission reduction.

[0045] The process involves several steps. First, mature and conventional technologies (dissolving, defoaming and filtering, spinning, washing, and drying) are used to prepare aramid 1414 precursor fibers. Second, aramid 1414 precursor fibers with a fineness of 1500-6000D, a moisture content of 20-30%, and an elastic modulus of 110-130 GPa are selected and subjected to a first oiling, heat treatment, a second oiling, and winding process. This involves two-stage oiling and zoned heat treatment, with control over the oiling rate, heat treatment temperature, and heat treatment tension. Ultimately, high-modulus aramid 1414 fibers for optical cables with an elastic modulus of 110-130 GPa are obtained. This ensures the large-scale and continuous production of aramid 1414 fibers while maintaining and preserving the initial modulus, making them suitable for optical cables.

[0046] Furthermore, a continuous pathway for preparing high-modulus aramid 1414 fibers for optical cables is formed between the dryer, oiler I, heat treatment device, oiler II, and winding device. Moreover, based on the systematic control of oiling rate, heat treatment temperature, and heat treatment tension, this invention ensures that high-modulus aramid 1414 fibers for optical cables can be produced on a large scale, in a standardized and systematic manner. Attached Figure Description

[0047] Figure 1This is a process flow diagram of the present invention;

[0048] Figure 2 This is a schematic diagram illustrating the working principle of the device in this invention;

[0049] Figure 3 This is a block diagram of the device logic connection in this invention;

[0050] In the diagram, 1 is the stock solution preparation device, 2 is the defoaming device, 3 is the filtration device, 4 is the spinning device, 5 is the washing device, 6 is the dryer, 7 is the oiling machine I, 8 is the heat treatment device, 81 is the heat treatment zone, 82 is the spraying zone, 83 is the cold roller zone, 9 is the oiling machine II, and 10 is the winding device. Detailed Implementation

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0052] Example 1

[0053] This embodiment provides: a high-modulus aramid 1414 fiber for optical cables, which is prepared by mixing and dissolving poly(p-phenylene terephthalamide) resin (PPTA) and sulfuric acid as raw materials, followed by degassing and filtration, spinning, washing, drying, offline heat treatment or online heat treatment;

[0054] The performance indicators of the high-modulus aramid 1414 fiber for optical cables include:

[0055] Fracture strength: 18.0-20.0 cN / dtex;

[0056] Elastic modulus: 110-130 GPa;

[0057] Elongation at break: 2.0-3.2%;

[0058] Moisture content: 3.0-7.0%.

[0059] Example 2

[0060] This embodiment provides a method for preparing high-modulus aramid 1414 fiber for optical cables, such as... Figure 1 As shown, it includes the following steps:

[0061] S1: Preparation of Aramid 1414 precursor yarn

[0062] Poly(p-phenylene terephthalamide) resin and sulfuric acid are mixed and dissolved, defoamed, filtered, spun, washed and dried to obtain aramid 1414 precursor yarn with a fineness of 1500-6000D, a moisture content of 20-30% and an elastic modulus of 110-130Gpa.

[0063] S2: First oiling

[0064] The aramid 1414 precursor yarn was placed on oiling machine I, and the oil content of the aramid 1414 precursor yarn was controlled to be 0.4±0.2%.

[0065] S3: Heat treatment

[0066] After the first oiling, the aramid 1414 raw yarn is placed in a heat treatment machine and sequentially passed through the heat treatment zone for stretching, the spray zone for spraying, and the cold roller zone for heat setting to obtain aramid 1414 yarn.

[0067] Specifically, the temperature of the heat treatment zone is controlled at 220-360℃, the tension between the dryer and the heat treatment zone is 1.2-3.5 g / d, and the tension between the heat treatment zone and the cold roller zone is 1.5-3.5 g / d.

[0068] S4: Second oiling

[0069] Aramid 1414 yarn was placed on oiling machine II, and the oil content was controlled at 1.4±0.4%.

[0070] S5: Winding

[0071] The aramid 1414 filaments after the second oiling are wound by a winding machine to obtain high-modulus aramid 1414 fiber for optical cables with an elastic modulus of 110-130 Gpa.

[0072] Furthermore, the material conveying rate inside the heat treatment machine is 330-370 m / min, and the stretching time in the heat treatment zone is 0.7-1.2 s.

[0073] Furthermore, the heat treatment zone includes heat treatment zone I and heat treatment zone II, and the cold roller zone includes cold roller zone I and cold roller zone II. The temperature of heat treatment zone I is 220-240℃, and the stretching time is 0.3-0.5s; the temperature of heat treatment zone II is 320-360℃, and the stretching time is 0.55-0.7s; the tension between the dryer and heat treatment zone I is 1.2-1.5g / d, the tension between heat treatment zone I and heat treatment zone II is 2.5-3.5g / d, and the tension between heat treatment zone II and cold roller zone I is 1.5-3.5g / d.

[0074] Example 3

[0075] This embodiment provides a system for preparing high-modulus aramid 1414 fiber for optical cables, such as... Figure 2-3As shown, the device includes a solution preparation device 1, a degassing device 2, a filtering device 3, a spinning device 4, a washing device 5, a dryer 6, an oiling machine I 7, a heat treatment device 8, an oiling machine II 9, and a winding device 10. The solution preparation device 1, the degassing device 2, the filtering device 3, the spinning device 4, the washing device 5, and the dryer 6 are connected in sequence, forming a continuous pathway for preparing aramid 1414 precursor yarn.

[0076] Oiling machine I7 is located behind the station of dryer 6, heat treatment device 8 is located behind the station of oiling machine I7, oiling machine II9 is ​​located behind the station of heat treatment device 8, and winding device 10 is located behind the station of oiling machine II9. A continuous path for preparing high modulus aramid 1414 fiber for optical cables is formed between dryer 6, oiling machine I7, heat treatment device 8, oiling machine II9 and winding device 10.

[0077] Furthermore, the heat treatment device 8 includes a heat treatment zone 81, a spray zone 82, and a cold roller zone 83. The heat treatment zone 81 is provided with multiple stretching rollers, the spray zone 82 is provided with a spraying mechanism, and the cold roller zone 83 is provided with multiple heat setting rollers. A continuous passage for material stretching, spraying, and heat setting is formed between the stretching rollers, the spraying mechanism, and the heat setting rollers.

[0078] Furthermore, the heat treatment zone 81 includes heat treatment zone I and heat treatment zone II. Heat treatment zone I is provided with six stretching rollers, and heat treatment zone II is provided with eight stretching rollers. The stretching rollers in heat treatment zone I are distributed on one side of the stretching rollers in heat treatment zone II.

[0079] Furthermore, the cold roll area 83 includes cold roll area I and cold roll area II. Cold roll area I is provided with four heat setting rollers, and cold roll area II is provided with four heat setting rollers. The heat setting rollers in cold roll area I are distributed on one side of the heat setting rollers in cold roll area II.

[0080] Example 4

[0081] Based on Example 2, this example discusses the process conditions involved in the preparation method of high-modulus aramid 1414 fiber for optical cables, in order to further illustrate the technical solution.

[0082] I. The Influence of Tension on the Mechanical Properties of Fibers After Heat Treatment

[0083] Table 1. Effect of tension on the mechanical properties of fiber after heat treatment

[0084]

[0085] Therefore, it can be seen that under the same heat treatment temperature and time, the fiber orientation degree increases and the modulus improves with increasing tension. However, when the tension exceeds 3.8 g / d, fibers with structural defects begin to break, easily leading to filament breakage and roller entanglement, affecting production stability. Simultaneously, maintaining low tension between the dryer and the heat treatment machine reduces wear between the fiber and the roller. To ensure sufficient fiber stretching during heat treatment and prevent fiber breakage, a suitable tension control is below 3.5 g / d.

[0086] II. Effect of heat treatment temperature on the mechanical properties of fiber heat treatment

[0087] Table 2 Effect of temperature on the mechanical properties of fiber heat treatment

[0088]

[0089] In the online heat treatment process, the effects of temperatures in heat treatment zones I and II on fiber properties were investigated. Currently, the highest set temperature for heat treatment zone I is 270℃, and the highest set temperature for heat treatment zone II is 390℃. However, when the temperature setting in heat treatment zone I exceeds 260℃, the stretching rollers in heat treatment zone I are prone to alarming. This is because the initial moisture content of the fiber before entering heat treatment is maintained at 20-30%. When the temperature setting in heat treatment zone I is too high, the heating load in heat treatment zone I increases, and when the heat treatment machine reaches its limit load, an alarm will sound. Furthermore, if the temperature in heat treatment zone I is too high, the moisture content of the fiber entering heat treatment zone II will be too low. During heat treatment, there will not be enough moisture to provide lubrication, and the fiber structure will be easily damaged and breakage will occur during the heat treatment process. Therefore, it can be concluded that the suitable temperature setting for heat treatment zone I is 220-240℃.

[0090] Fiber crystallization orientation mainly occurs in heat treatment zone II. It is known that as the temperature increases, the fiber modulus is improved. When the average temperature of heat treatment zone II is higher than 320℃, high-modulus products are easily obtained. When the temperature continues to rise to 380℃, the fiber softens at high temperature, and the fiber structure is more prone to wear in the high-temperature zone, resulting in fiber breakage and entanglement, which affects the stability of production. Experiments show that when the average temperature of heat treatment zone II is 320-360℃, high-modulus products are easily obtained, and the frequency of fiber breakage is less. However, due to the differences between workstations, fiber breakage still exists.

[0091] III. The Impact of Oiling Method on Product Performance

[0092] In the initial experiments, the fibers were directly heat-treated and then oiled after being heated and set on the heat-setting roller. As a result, the fibers were prone to tangling and breaking on the cold roller. In order to improve production stability, the effects of the oiling and cold-setting schemes on fiber properties were investigated.

[0093] In the experiment, the initial moisture content of the fiber before heat treatment was controlled at 20-30%, the average temperature of heat treatment zone I was 220℃, the average temperature of heat treatment zone II was 320℃, and the tension between heat treatment zones I and II, as well as between the stretching roller and the heat setting roller, was controlled at 3g / d. Applying oil to the fiber before heat treatment lubricates the fiber during the process, increases fiber bundle cohesion, reduces friction and wear between the fiber and the hot roller, and improves the stability of the heat treatment. Since the fiber has strong static electricity after heat treatment, spraying water or oil between the hot and cold rollers reduces this static electricity, lubricates the fiber as it passes through the cold roller, and rapidly cools the fiber, which is beneficial for subsequent cold setting.

[0094] Table 3. Impact of oiling method on product performance

[0095]

[0096] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for producing high modulus aramid 1414 fiber for optical cable, characterized by, It comprises the following steps: S1: Preparation of aramid 1414 filaments Poly-p-phenyleneterephthalamide resin and sulfuric acid are mixed and dissolved, defoamed, filtered, spun, washed and dried to obtain aramid 1414 filaments with a fineness of 1500-6000D, a moisture content of 20-30% and an elastic modulus of 110-130Gpa; S2: First oiling The aramid 1414 filaments are placed on the oiling machine I, and the oil content of the aramid 1414 filaments is controlled to be 0.4±0.2%; S3: Heat treatment The aramid 1414 filaments after the first oiling are placed in the heat treatment machine, and are sequentially stretched in the heat treatment zone, sprayed in the spraying zone and heat set in the cold roller zone to obtain aramid 1414 filaments; The heat treatment zone includes heat treatment zone I and heat treatment zone II, and the cold roller zone includes cold roller zone I and cold roller zone II. The temperature of heat treatment zone I is 220-240℃, and the stretching time is 0.3-0.5s. The temperature of heat treatment zone II is 320-360℃, and the stretching time is 0.55-0.7s. The tension between the drying machine and heat treatment zone I is 1.2-1.5g / d, the tension between heat treatment zone I and heat treatment zone II is 2.5-3.5g / d, and the tension between heat treatment zone II and cold roller zone I is 1.5-3.5g / d; S4: Second oiling The aramid 1414 filaments are placed on the oiling machine II, and the oil content of the aramid 1414 filaments is controlled to be 1.4±0.4%; S5: Winding The aramid 1414 filaments after the second oiling are wound by the winding machine to obtain high modulus aramid 1414 fibers for optical cables with an elastic modulus of 110-130Gpa. The product performance indicators of the high modulus aramid 1414 fibers for optical cables include: Breaking strength: 18.0-20.0cN / dtex; Elastic modulus: 110-130Gpa; Breaking elongation: 2.0-3.2%; Moisture content: 3.0-7.0%.

2. The method of claim 1, wherein the high modulus aramid 1414 fiber for optical cable is prepared by the steps of: (a) preparing a solution of poly(phenylene terephthalamide) in a solvent; (b) extruding the solution into a fiber; (c) drying the fiber; and (d) heat treating the fiber. The material conveying speed in the heat treatment machine is 330-370 m / min.

3. The method for preparing high-modulus aramid 1414 fiber for optical cables according to claim 1, characterized in that, The heat treatment zone is stretched for 0.7-1.2s.

4. A system for producing high modulus aramid 1414 fiber for optical cable, characterized by, The preparation system used in the preparation method of any one of claims 1-3, the preparation system comprises a stock solution preparation device (1), a defoaming device (2), a filtering device (3), a spinning device (4), a washing device (5) and a drying machine (6), the stock solution preparation device (1), the defoaming device (2), the filtering device (3), the spinning device (4), the washing device (5) and the drying machine (6) are connected in sequence, and a continuous path for preparing aramid 1414 filaments is formed between the stock solution preparation device (1), the defoaming device (2), the filtering device (3), the spinning device (4), the washing device (5) and the drying machine (6), characterized in that the preparation system further comprises an oiling machine I (7), a heat treatment device (8), an oiling machine II (9) and a winding device (10), the oiling machine I (7) is arranged at the rear side of the working position of the drying machine (6), the heat treatment device (8) is arranged at the rear side of the working position of the oiling machine I (7), the oiling machine II (9) is arranged at the rear side of the working position of the heat treatment device (8), the winding device (10) is arranged at the rear side of the working position of the oiling machine II (9), and a continuous path for preparing high-modulus aramid 1414 fibers for optical cables is formed between the drying machine (6), the oiling machine I (7), the heat treatment device (8), the oiling machine II (9) and the winding device (10).

5. The system for preparing high modulus aramid 1414 fiber for optical cable according to claim 4, characterized in that, The heat treatment device (8) comprises a heat treatment zone (81), a spraying zone (82) and a cold roller zone (83), a plurality of stretching rollers are arranged in the heat treatment zone (81), a spraying mechanism is arranged in the spraying zone (82), and a plurality of heat setting rollers are arranged in the cold roller zone (83), and a continuous path for material stretching, spraying and heat setting is formed between the stretching rollers, the spraying mechanism and the heat setting rollers.

6. The system for preparing high modulus aramid 1414 fiber for optical cable according to claim 5, wherein, The heat treatment zone (81) comprises a heat treatment zone I and a heat treatment zone II, six stretching rollers are arranged in the heat treatment zone I, and eight stretching rollers are arranged in the heat treatment zone II, and the stretching rollers in the heat treatment zone I are distributed on one side of the stretching rollers in the heat treatment zone II.

7. The system for preparing high modulus aramid 1414 fiber for optical cable according to claim 5 or 6, characterized in that, The cold roller zone (83) comprises a cold roller zone I and a cold roller zone II, four heat setting rollers are arranged in the cold roller zone I, and four heat setting rollers are arranged in the cold roller zone II, and the heat setting rollers in the cold roller zone I are distributed on one side of the heat setting rollers in the cold roller zone II.

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