A low-attenuation, low-delay optical fiber loose tube material preparation device and production process

Abstract

The present invention discloses a low-attenuation, low-delay optical fiber loose tube material preparation device and production process, including: a reactor body, a vacuum pump, a mixing and stirring component and an esterification dispersion component, the input end of the vacuum pump is connected to the interior of the reactor body, the top surface of the reactor body is provided with a sealing top cover, the top end of the esterification dispersion component is fixedly connected to the bottom surface of the reactor body, the surface of the sealing top cover is provided with a feeding end cover, and one side of the reactor body is fixedly connected with a lid opening mechanism fixedly connected to the surface of the reactor body. In the present invention, by adopting a decompression dispersion mechanism, the reactor body is driven by the vacuum pump to generate negative pressure inside the esterification dispersion component, so that the material inside the esterification dispersion component is pushed by the air pressure to escape from the micropores on the surface of the dispersion inner cylinder, and in the process of escaping, the material is broken up and reorganized at the molecular level to achieve material recombination, and the material is mixed in the material polycondensation reaction to improve the polycondensation reaction effect.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber loose tube production, and in particular to a low-attenuation and low-delay optical fiber loose tube material preparation device and production process. Background Art

[0002] The special material for loose tube of optical fiber cable is also called the special material for secondary coating of optical fiber PBT. The scientific name of PBT is polybutylene terephthalate. The continuous production method is adopted abroad, and 1,4-butanediol and dimethyl terephthalate are used for ester exchange. The main feature of this method is that the reaction speed is relatively fast, the operating conditions are easy to control, and the cost of the product is basically close to that of the PTA production method. The ordinary PBT material sold abroad cannot be used for optical cables, and my country can only produce ordinary PBT material. The ordinary PBT material has low strength. Due to its small molecular weight, it has low intrinsic viscosity and high melt index. When melted, the flow rate reaches 65 grams / 10 minutes.

[0003] The solid phase continuous thickening method is to fluidize the low-viscosity PBT resin for pre-crystallization, crystallization and thickening, and then mix it with the special masterbatch, cool it and remove dust, and then transport it to the silo. The whole production process is continuous and highly automated, but there are problems such as the masterbatch is not easy to mix evenly, which affects the stability of the product. The existing patent "Method for producing optical cable grade products using existing equipment for synthesizing polybutylene terephthalate" (200810203401.1) introduces a method for adding functional masterbatch to high-viscosity PBT products in the solid phase polymerization stage to produce optical cable materials. The special products produced are difficult to meet the quality requirements of high-speed production.

[0004] In addition, the existing optical fiber loose tube material preparation device is mainly prepared by the existing general-purpose esterification reactor and polycondensation reactor. During the preparation process, the generated reaction materials need to be transferred manually. The esterification reactor and the polycondensation reactor use paddle or double-helix high-speed dispersion structure to disperse and mix the materials. Since the viscosity of the material increases in the solid phase polymerization stage, the traditional high-speed dispersion equipment cannot obtain a higher speed in the viscous material, resulting in low reaction mixing efficiency and the material cannot be fully and evenly mixed. It needs to be dispersed for a long time, which further slows down the reaction preparation process.

[0005] In view of this, research and improvement are carried out on the existing problems, and a low-attenuation, low-delay optical fiber loose tube material preparation device and production process are provided to solve the current problems of low production reaction efficiency and low economic benefits. The purpose is to achieve the purpose of solving problems and improving practical value through this technology. Summary of the invention

[0006] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0007] To this end, the technical solution adopted by the present invention is: a low-attenuation, low-delay optical fiber loose tube material preparation device, comprising: a reactor body, a vacuum pump, a mixing and stirring component and an esterification dispersion component, the input end of the vacuum pump is connected to the interior of the reactor body, the top surface of the reactor body is provided with a sealing top cover, the top end of the esterification dispersion component is fixedly connected to the bottom surface of the reactor body, the surface of the sealing top cover is provided with a feeding end cover, one side of the reactor body is fixedly connected to a cover-opening mechanism fixedly connected to the surface of the reactor body, and the mixing and stirring component is fixedly installed on the surface of the sealing top cover;

[0008] The esterification dispersion component includes a dispersion outer cylinder and a dispersion inner cylinder, a sealing sleeve is fixedly installed on the bottom end of the dispersion outer cylinder, and the dispersion outer cylinder is rotatably sleeved on the outer side of the dispersion inner cylinder through the sealing sleeve. The mixing and stirring component includes a drive motor transmission gear ring, a lifting vane and a fixed stirring rod. The drive motor is fixedly installed on the surface of the sealing top cover and the output end is fixedly sleeved on the driving tooth located inside the reactor body and meshed with the transmission gear ring. The transmission gear ring is fixedly sleeved on the outer side of the dispersion outer cylinder, and the surface of the dispersion outer cylinder is provided with dispersion micropores. The lifting vane is fixedly welded to the inner side of the dispersion outer cylinder and is slidably abutted against the outer side of the dispersion inner cylinder. A material cavity is provided inside the dispersion inner cylinder, and a plurality of mixing guide holes are opened on the surface of the dispersion inner cylinder. The fixed stirring rod is movably installed on the surface of the dispersion inner cylinder.

[0009] In a preferred example, the present invention can be further configured as follows: the top of the dispersion inner cylinder is connected to the outside through an opening on the top surface of the sealing top cover, the bottom surface of the feeding end cover is sealed and abutted against the top of the material cavity, the mixing guide hole is located at the bottom end of the dispersion inner cylinder, and the two ends of the mixing guide hole are respectively connected to the inside of the material cavity and the inner cavity of the dispersion outer cylinder.

[0010] By adopting the above technical scheme, the raw materials are loaded into the dispersion inner cylinder, and the esterification and polycondensation reactions are carried out in the esterification dispersion component and the reactor body respectively, so that the preparation of optical fiber loose tube materials can be integrated without the need for transfer between the reactors, thus realizing the integration of the reactors.

[0011] In a preferred example, the present invention can be further configured as follows: the dispersion micropores are located on the surface of the dispersion outer cylinder and close to the top of the dispersion outer cylinder, the dispersion micropores are densely distributed in an annular shape, and the through-hole diameter of the dispersion micropores is 0.02-0.1 μm.

[0012] By adopting the above technical solution, the internal pressure of the dispersion outer cylinder and the dispersion inner cylinder is greater than the internal pressure of the reactor body, so that the product escapes from the dispersion micropores under the lifting effect of the lifting rotor and the pressure difference.

[0013] In a preferred example, the present invention can be further configured as follows: the mixing guide holes are evenly distributed on the surface of the dispersion inner cylinder in a spiral shape and close to the bottom end of the dispersion inner cylinder, and the through hole diameter of the mixing guide holes is 0.1-0.5 mm.

[0014] By adopting the above technical solution, the interior of the reactor body is intermittently pressurized and depressurized by a vacuum pump, so that the boring material can be repeatedly mixed with the slurry through the mixing guide hole. In the process of escape, the material is broken up and reorganized at the molecular level to achieve material recombination, and the material is mixed during the condensation reaction of the material to improve the condensation reaction effect.

[0015] In a preferred example, the present invention can be further configured as follows: the lifting vane has a spiral blade structure, and the bottom end of the lifting vane is in sliding contact with the top surface of the sealing sleeve, the bottom end of the lifting vane is fixedly connected to the surface of the transmission gear ring, and the number of the fixed stirring rods is several and they are spirally distributed on the surface of the dispersion inner cylinder and are located in the spiral gap of the lifting vane.

[0016] By adopting the above technical solution, during the lifting process, the moving material contacts the relatively static fixed stirring rod, thereby further stirring and mixing the material. The contact between the material and the fixed stirring rod further performs boring mixing, thereby improving the reaction efficiency.

[0017] In a preferred example, the present invention can be further configured as follows: the fixed stirring rod includes a rotating pin and a paddle plate, the paddle plate is rotatably sleeved on the outer side of the rotating pin, one end of the rotating pin is welded and fixed to the outer side of the dispersion inner cylinder, the material contacts the paddle plate, and the paddle plate can rotate freely to improve the mixing effect.

[0018] A low-attenuation, low-delay optical fiber loose tube material preparation production process, comprising the following steps:

[0019] S1: The raw materials are 1,4-butanediol and purified terephthalic acid, and the molar ratio of the two is 1.0-1.6:1. They are mixed evenly in a slurry preparation tank to prepare slurry. The feeding end cover is opened and the slurry is put into the inner dispersion cylinder. The catalyst is added and the heating is turned on.

[0020] S2: intermittently pressurize and depressurize the interior of the reactor body through a vacuum pump, with the pressurization and depressurization time both being 5 seconds, so that the raw materials and the catalyst are repeatedly mixed through the mixing guide hole at 200-270° C. and a pressure of 10 kPa-500 kPa to perform slurry mixing, and the esterification reaction lasts for 20-30 minutes to generate dihydroxybutyl terephthalate;

[0021] S2: Dihydroxybutyl terephthalate is subjected to polycondensation reaction in the presence of a catalyst, an auxiliary agent, high temperature and reduced pressure, and a vacuum pump is started to decompress the interior of the reactor. During the decompression operation, the reaction pressure is controlled to be 100Pa-200Pa and the reaction temperature is 200°C-260°C. After the reaction is continued for 20 minutes, the feeding end cover is opened, and the outer dispersion cylinder is driven by the rotation of the driving motor to rotate on the outside of the inner dispersion cylinder. The material is lifted along the surface of the inner dispersion cylinder by the rotation of the lifting vane. During the lifting process, the moving material contacts the relatively stationary fixed stirring rod, thereby further stirring the mixed material to generate 1,4-butanediol and polybutylene terephthalate;

[0022] S4: Open the air valve on the surface of the feeding end cover, the air pressure inside the dispersion outer cylinder and the dispersion inner cylinder is greater than the air pressure inside the reactor body, so that the product escapes from the dispersion micropores under the lifting effect of the lifting rotor and the pressure difference. During the escape process, the material molecules are further dispersed and recombined, so that they are fully mixed and enter the reactor body;

[0023] S5: All materials enter the reactor body, close the feeding end cover, cool naturally, and then stand for 10-15 minutes, then control the temperature to 200℃~260℃ and the reaction pressure to 10Pa~2000Pa for solid phase polycondensation reaction to obtain PBT optical fiber loose tube special material.

[0024] By adopting the above technical solution, the reduced pressure mixing is carried out in an integrated manner to disperse the reaction materials and provide polycondensation reaction conditions, so that the contact between the material molecules is more sufficient and uniform, effectively improving the reaction efficiency and reducing the reaction conditions.

[0025] The beneficial effects achieved by the present invention are:

[0026] 1. In the present invention, by adopting a decompression dispersion mechanism, a negative pressure is generated inside the esterification dispersion component by utilizing the reaction kettle body driven by a vacuum pump, so that the material inside the esterification dispersion component is pushed by the gas pressure to escape from the micropores on the surface of the dispersion inner cylinder, and in the process of escape, the material is broken up and reorganized at the molecular level to achieve material recombination, and the material is mixed during the material polycondensation reaction to improve the polycondensation reaction effect.

[0027] 2. In the present invention, by adopting a multi-layer cylinder structure, the materials are located in the dispersion outer cylinder and the dispersion inner cylinder for mixing operations in different reactions, and the solid phase polycondensation reaction is carried out inside the reactor body, thereby realizing the integrated preparation of optical fiber loose tube materials without the need for transfer between various reactors, realizing the integration of reactors, reducing the labor intensity of personnel and the cost investment of production equipment, and improving economic benefits.

[0028] 3. In the present invention, by adopting a microporous through-type mixing process, a vacuum pump is used to perform a decompression operation inside the reactor during material mixing, and the decompression mixing is performed in an integrated manner to disperse each reaction material and provide condensation polymerization conditions, so that the contact between material molecules is more sufficient and uniform, effectively improving the reaction efficiency and reducing the reaction conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the internal structure of a reactor body according to an embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of a mixing and stirring component and an esterification and dispersion component according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of an esterification dispersion component according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of a dispersion outer cylinder according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the dispersed inner cylinder structure of an embodiment of the present invention;

[0035] Figure 7 For an embodiment of the present invention Figure 6 Schematic diagram of the structure at point A.

[0036] Reference numerals:

[0037] 100, reactor body; 110, sealing top cover; 120, cover opening mechanism; 130, feeding end cover;

[0038] 200. Vacuum pump;

[0039] 300, mixing and stirring assembly; 310, driving motor; 320, transmission gear ring; 330, lifting rotor; 340, fixed stirring rod; 311, driving gear;

[0040] 400, esterification dispersion component; 410, dispersion outer cylinder; 420, dispersion inner cylinder; 411, dispersion micropores; 412, sealing sleeve; 421, material cavity; 422, mixing guide hole. DETAILED DESCRIPTION

[0041] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0042] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0043] A low-attenuation, low-delay optical fiber loose tube material preparation device and production process provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0044] Combination Figure 1-7 As shown, a low-attenuation and low-delay optical fiber loose tube material preparation device provided by the present invention comprises: a reactor body 100, a vacuum pump 200, a mixing and stirring assembly 300 and an esterification and dispersion assembly 400, wherein the input end of the vacuum pump 200 is connected to the interior of the reactor body 100, a sealing top cover 110 is provided on the top surface of the reactor body 100, the top end of the esterification and dispersion assembly 400 is fixedly connected to the bottom surface of the reactor body 100, a feeding end cover 130 is provided on the surface of the sealing top cover 110, a cover-opening mechanism 120 fixedly connected to the surface of the reactor body 100 is fixedly connected to one side of the reactor body 100, and the mixing and stirring assembly 300 is fixedly installed on the surface of the sealing top cover 110;

[0045] The esterification dispersion assembly 400 includes a dispersion outer cylinder 410 and a dispersion inner cylinder 420. The bottom end of the dispersion outer cylinder 410 is fixedly mounted with a sealing sleeve 412. The dispersion outer cylinder 410 is rotatably sleeved on the outer side of the dispersion inner cylinder 420 through the sealing sleeve 412. The mixing and stirring assembly 300 includes a drive motor 310, a transmission gear ring 320, a lifting rotor 330 and a fixed stirring rod 340. The drive motor 310 is fixedly mounted on the surface of the sealing top cover 110 and the output end is fixedly sleeved on the inside of the reactor body 100 and connected to the inner cylinder 420. The transmission gear ring 320 drives the meshing driving teeth 311, and the transmission gear ring 320 is fixedly sleeved on the outer side of the dispersion outer cylinder 410. The surface of the dispersion outer cylinder 410 is provided with dispersion micropores 411. The lifting vane 330 is fixedly welded to the inner side of the dispersion outer cylinder 410 and is slidably abutted against the outer side of the dispersion inner cylinder 420. The interior of the dispersion inner cylinder 420 is provided with a material cavity 421. The surface of the dispersion inner cylinder 420 is provided with a plurality of mixing guide holes 422. The fixed stirring rod 340 is movably installed on the surface of the dispersion inner cylinder 420.

[0046] In this embodiment, the top end of the dispersion inner cylinder 420 is connected to the outside through the opening on the top surface of the sealing top cover 110, the bottom surface of the feeding end cover 130 is sealed and abutted against the top end of the material cavity 421, and the mixing guide hole 422 is located at the bottom end of the dispersion inner cylinder 420, and the two ends of the mixing guide hole 422 are respectively connected to the interior of the material cavity 421 and the inner cavity of the dispersion outer cylinder 410.

[0047] Specifically, a multi-layer cylinder structure is adopted, and the materials are located inside the dispersion outer cylinder 410 and the dispersion inner cylinder 420 for mixing operations in different reactions, and a solid phase polycondensation reaction is carried out inside the reactor body 100, thereby realizing the integrated preparation of optical fiber loose tube materials without the need for transfer between various reactors, realizing the integration of reactors, reducing the labor intensity of personnel and the cost investment of production equipment, and improving economic benefits.

[0048] In this embodiment, the dispersion micropores 411 are located on the surface of the dispersion outer cylinder 410 and close to the top of the dispersion outer cylinder 410. The dispersion micropores 411 are densely distributed in an annular shape, and the through-hole diameter of the dispersion micropores 411 is 0.02-0.1 μm.

[0049] Specifically, the internal air pressure of the dispersion outer cylinder 410 and the dispersion inner cylinder 420 is greater than the internal air pressure of the reactor body 100, so that the product escapes from the dispersion micropores 411 under the lifting action of the lifting rotor 330 and the pressure difference. The reactor body 100 generates a negative pressure inside the esterification dispersion component 400 driven by the vacuum pump 200, so that the material inside the esterification dispersion component 400 is pushed by the air pressure to escape from the micropores on the surface of the dispersion inner cylinder 420, and in the process of escape, the material is broken up and reorganized at the molecular level to achieve material recombination, and the material is mixed during the material condensation reaction to improve the condensation reaction effect.

[0050] In this embodiment, the mixing guide holes 422 are evenly distributed on the surface of the dispersion inner cylinder 420 in a spiral shape and close to the bottom end of the dispersion inner cylinder 420. The through hole diameter of the mixing guide holes 422 is 0.1-0.5 mm.

[0051] Specifically, the interior of the reactor body 100 is intermittently pressurized and depressurized by the vacuum pump 200, so that the boring material can be repeatedly mixed with the slurry through the mixing guide hole 422. During the escape process, the material is broken up and reorganized at the molecular level to achieve material recombination, and the material is mixed during the condensation reaction of the material to improve the condensation reaction effect.

[0052] In this embodiment, the lifting vane 330 has a spiral blade structure, and the bottom end of the lifting vane 330 is in sliding contact with the top surface of the sealing sleeve 412, and the bottom end of the lifting vane 330 is fixedly connected to the surface of the transmission gear ring 320. The number of the fixed stirring rods 340 is several and is spirally distributed on the surface of the dispersion inner cylinder 420 and is located in the spiral gap of the lifting vane 330.

[0053] Specifically, during the lifting process, the moving material contacts the relatively stationary fixed stirring rod 340, thereby further stirring and mixing the material. The contact between the material and the fixed stirring rod 340 further performs boring mixing, thereby improving the reaction efficiency.

[0054] In this embodiment, the fixed stirring rod 340 includes a rotating pin and a paddle plate. The paddle plate is rotatably sleeved on the outer side of the rotating pin. One end of the rotating pin is welded and fixed to the outer side of the dispersion inner cylinder 420. The material contacts the paddle plate, and the paddle plate can rotate freely to improve the mixing effect.

[0055] A low-attenuation, low-delay optical fiber loose tube material preparation production process, comprising the following steps:

[0056] S1: The raw materials are 1,4-butanediol and purified terephthalic acid, and the molar ratio of the two is 1.0-1.6:1. They are mixed evenly in a slurry preparation tank to prepare slurry. The feeding end cover 130 is opened and the slurry is put into the inner dispersion cylinder 420. The catalyst is added and the heating is turned on.

[0057] S2: The interior of the reactor body 100 is intermittently pressurized and depressurized by the vacuum pump 200, and the pressurization and depressurization time are both 5 seconds, so that the raw materials and the catalyst are repeatedly mixed through the mixing guide hole 422 at 200-270° C. and a pressure of 10 kPa-500 kPa to perform slurry mixing, and the esterification reaction is continued for 20-30 minutes to generate dihydroxybutyl terephthalate;

[0058] S2: Dihydroxybutyl terephthalate is subjected to polycondensation reaction under the conditions of catalyst, auxiliary agent, high temperature and reduced pressure. The vacuum pump 200 is started to decompress the interior of the reactor body 100. During the decompression operation, the reaction pressure is controlled to be 100Pa-200Pa and the reaction temperature is 200°C-260°C. After the reaction is continued for 20 minutes, the feeding end cover 130 is opened, and the outer dispersion cylinder 410 is driven by the rotation of the driving motor 310 to rotate on the outer side of the dispersion inner cylinder 420. The material is lifted and moved along the surface of the dispersion inner cylinder 420 by the rotation of the lifting vane 330. During the lifting process, the moving material contacts the relatively stationary fixed stirring rod 340, thereby further stirring the mixed material to generate 1,4-butanediol and polybutylene terephthalate;

[0059] S4: Open the air valve on the surface of the feeding end cover 130, and the internal air pressure of the dispersion outer cylinder 410 and the dispersion inner cylinder 420 is greater than the internal air pressure of the reactor body 100, so that the product escapes from the dispersion micropores 411 under the lifting action of the lifting rotor 330 and the pressure difference. During the escape process, the material molecules are further dispersed and recombined, so as to be fully mixed and enter the reactor body 100;

[0060] S5: All the materials enter the reactor body 100, and the feeding end cover 130 is closed and cooled naturally. After standing for 10-15 minutes, the temperature is controlled to 200°C to 260°C and the reaction pressure is 10Pa to 2000Pa to perform solid phase polycondensation reaction to obtain PBT optical fiber loose tube special material.

[0061] By adopting the above technical solution, the reduced pressure mixing is carried out in an integrated manner to disperse the reaction materials and provide polycondensation reaction conditions, so that the contact between the material molecules is more sufficient and uniform, effectively improving the reaction efficiency and reducing the reaction conditions.

[0062] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The term "and / or" used herein includes any and all combinations of one or more of the related listed items. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connect" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0063] It should be noted that when an element is referred to as being "assembled on", "installed on", "fixed on" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0064] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A production process for preparing low-attenuation and low-delay optical fiber loose tube material, characterized in that: The preparation is carried out using a preparation device, comprising the following steps: S1: 1,4-butanediol and purified terephthalic acid are used as raw materials, and the molar ratio of the two is 1.0 to 1.6:

1. They are mixed evenly in a slurry preparation tank to prepare slurry. The feeding end cover (130) is opened and the slurry is put into the dispersion inner cylinder (420). A catalyst is added and heating is started. S2: intermittently pressurizing and depressurizing the interior of the reactor body (100) by means of a vacuum pump (200), with the pressurization and depressurization time both being 5 seconds, so that the raw materials and the catalyst are repeatedly mixed through the mixing guide hole (422) at 200 to 270° C. and a pressure of 10 kPa to 500 kPa to form a slurry, and an esterification reaction is carried out for 20 to 30 minutes to generate dihydroxybutyl terephthalate; S2: bis(hydroxybutyl terephthalate) is subjected to polycondensation reaction in the presence of a catalyst, an auxiliary agent, high temperature and reduced pressure, the vacuum pump (200) is started to reduce the pressure inside the reactor body (100), the outer dispersion cylinder (410) is driven to rotate on the outside of the inner dispersion cylinder (420) by the rotation of the driving motor (310), the material is lifted along the surface of the inner dispersion cylinder (420) by the rotation of the lifting vane (330), and during the lifting process, the moving material contacts the relatively stationary fixed stirring rod (340), thereby further stirring the mixed material to generate 1,4-butanediol and polybutylene terephthalate; S4: Opening the air valve on the surface of the feeding end cover (130), the internal air pressure of the dispersion outer cylinder (410) and the dispersion inner cylinder (420) is greater than the internal air pressure of the reaction kettle body (100), so that the product escapes from the dispersion micropores (411) under the lifting action of the lifting rotor (330) and the pressure difference. During the escape process, the material molecules are further dispersed and recombined, so that they are fully mixed and enter the reaction kettle body (100); S5: All the materials enter the reactor body (100), the feeding end cover (130) is closed, and after natural cooling and standing for 10-15 minutes, the temperature is controlled to be 200°C to 260°C, and the reaction pressure is 10Pa to 2000Pa, and a solid phase polycondensation reaction is performed to obtain a PBT optical fiber loose tube special material; The preparation device comprises: a reaction kettle body (100), a vacuum pump (200), a mixing and stirring assembly (300), and an esterification and dispersion assembly (400); the input end of the vacuum pump (200) is connected to the interior of the reaction kettle body (100); a sealing top cover (110) is provided on the top surface of the reaction kettle body (100); the top end of the esterification and dispersion assembly (400) is fixedly connected to the bottom surface of the reaction kettle body (100); a feeding end cover (130) is provided on the surface of the sealing top cover (110); a cover opening mechanism (120) fixedly connected to the surface of the reaction kettle body (100) is fixedly connected to one side of the reaction kettle body (100); and the mixing and stirring assembly (300) is fixedly mounted on the surface of the sealing top cover (110); The esterification dispersion assembly (400) comprises a dispersion outer cylinder (410) and a dispersion inner cylinder (420); a sealing sleeve (412) is fixedly mounted on the bottom end of the dispersion outer cylinder (410); the dispersion outer cylinder (410) is rotatably sleeved on the outside of the dispersion inner cylinder (420) via the sealing sleeve (412); the mixing and stirring assembly (300) comprises a drive motor (310), a transmission gear ring (320), a lifting rotor (330) and a fixed stirring rod (340); the drive motor (310) is fixedly mounted on the surface of the sealing top cover (110) and the output end is fixedly sleeved on the inside of the reaction kettle body (100) and A driving tooth (311) is in driving engagement with a driving tooth ring (320); the driving tooth ring (320) is fixedly sleeved on the outside of a dispersion outer cylinder (410); a surface of the dispersion outer cylinder (410) is provided with dispersion micropores (411); the lifting vane (330) is fixedly welded to the inside of the dispersion outer cylinder (410) and is in sliding contact with the outside of the dispersion inner cylinder (420); a material cavity (421) is provided inside the dispersion inner cylinder (420); a plurality of mixing guide holes (422) are provided on the surface of the dispersion inner cylinder (420); and the fixed stirring rod (340) is movably mounted on the surface of the dispersion inner cylinder (420).

2. A low attenuation and low delay optical fiber loose tube material preparation and production process according to claim 1, characterized in that: The top end of the dispersion inner cylinder (420) is connected to the outside through an opening on the top surface of the sealing top cover (110); the bottom surface of the feeding end cover (130) is in sealing contact with the top end of the material cavity (421); the mixing guide hole (422) is located at the bottom end of the dispersion inner cylinder (420); and the two ends of the mixing guide hole (422) are respectively connected to the inside of the material cavity (421) and the inner cavity of the dispersion outer cylinder (410).

3. The low attenuation and low delay optical fiber loose tube material preparation and production process according to claim 1, characterized in that: The dispersion micropores (411) are located on the surface of the dispersion outer cylinder (410) and close to the top of the dispersion outer cylinder (410). The dispersion micropores (411) are densely distributed in an annular shape. The through-hole diameter of the dispersion micropores (411) is 0.02-0.1 μm.

4. The low attenuation and low delay optical fiber loose tube material preparation and production process according to claim 1, characterized in that: The mixing guide holes (422) are evenly distributed in a spiral shape on the surface of the dispersion inner cylinder (420) and close to the bottom end of the dispersion inner cylinder (420), and the through hole diameter of the mixing guide holes (422) is 0.1-0.5 mm.

5. The low attenuation and low delay optical fiber loose tube material preparation and production process according to claim 1, characterized in that: The lifting vane (330) has a spiral blade structure, and the bottom end of the lifting vane (330) is in sliding contact with the top surface of the sealing shaft sleeve (412), and the bottom end of the lifting vane (330) is fixedly connected to the surface of the transmission gear ring (320). The fixed stirring rods (340) are in a plurality and are spirally distributed on the surface of the dispersion inner cylinder (420) and are located in the spiral gap of the lifting vane (330).

6. The low attenuation and low delay optical fiber loose tube material preparation and production process according to claim 1, characterized in that: The fixed stirring rod (340) comprises a rotating pin and a paddle, the paddle being rotatably sleeved on the outside of the rotating pin, and one end of the rotating pin being welded and fixed to the outside of the dispersion inner cylinder (420).

7. The low attenuation and low delay optical fiber loose tube material preparation and production process according to claim 1, characterized in that: In step S2, the reaction pressure is controlled to be 100Pa-200Pa, the reaction temperature is 200°C-260°C, and the reaction is continued for 20 minutes before the feeding end cover (130) is opened.

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