A method for preparing optical fiber for high-temperature non-fading and non-migration optical cable

Abstract

The present invention discloses an optical fiber for high-temperature non-fading and non-migrating optical cables and a preparation method thereof, and relates to optical fibers. The present invention first adds a curing monomer and 3-aminopropylmethyldimethoxysilane to the acrylic resin of the inner coating layer. The additive does not contain small molecule active substances, thereby avoiding the migration phenomenon; aminosiloxane can enhance the adhesion between the high-temperature resistant acrylate layer and the polyimide layer. Secondly, maleic anhydride and 4,4'-diaminodiphenyl ether are used as diamine monomers as reaction raw materials to synthesize a diamine monomer containing a diimide unit. A thermosetting polyimide film having a dynamic imine bond in the molecular backbone is prepared by an amine-aldehyde condensation reaction. The primary amine group in the aminosilane coupling agent is used to promote the reversible bond exchange reaction of the imine, thereby achieving self-repair. After long-term use, the optical fiber can be repaired after a large area of ​​delamination and peeling of the coating is repaired, thereby improving the high temperature resistance of the optical fiber. The optical fiber prepared by the present invention has a high-temperature stable effect.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fibers, in particular to an optical fiber for a high-temperature non-fading and non-migration optical cable and a preparation method thereof. Background Art

[0002] With the rapid development of optical communications, optical fiber, as a foundational material, has found widespread application in numerous fields. Different application scenarios place varying demands on optical fiber performance. For example, high-temperature sensing, oil and gas wells, and other high-temperature applications place particular demands on optical fiber's heat resistance. Currently, conventional optical fiber cannot meet the reliability requirements for use at higher temperatures. To meet the demands of high-temperature environments, optical fiber must maintain the same or similar optical performance, mechanical strength, and reliability as at room temperature and under typical operating conditions.

[0003] Conventional UV-curable polyacrylate-coated optical fibers experience severe aging and failure at temperatures exceeding 85°C. This is manifested by the coating turning yellow and black, weakening its mechanical properties, and losing its protective effect on the fiber, leading to spontaneous fiber breakage and failure to meet fiber transmission reliability requirements. Furthermore, after prolonged use, high-temperature-resistant optical fibers can experience extensive delamination between the inner and outer coatings. To address these issues, the present invention provides an optical fiber for high-temperature, non-fading, non-migration optical cables and a method for preparing the same, addressing the existing challenges. Summary of the Invention

[0004] The purpose of the present invention is to provide an optical fiber for a high-temperature non-fading and non-migration optical cable and a preparation method thereof, so as to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for preparing an optical fiber for a high-temperature non-fading and non-migration optical cable, wherein the optical fiber for the optical cable is prepared by applying a modified acrylic inner coating layer and a self-repairing polyimide outer coating layer to a melt-drawn optical fiber; the self-repairing polyimide is prepared using a diamine monomer containing a maleimide group and a bisimide unit as a raw material;

[0006] The preparation process of the self-healing polyimide is as follows: first, a certain amount of diamine monomer containing a bisimide moiety is weighed into a three-necked flask, and then p-phenylenediamine is added and stirred at high speed to completely dissolve it, wherein the mass ratio of the diamine monomer containing a bisimide moiety to p-phenylenediamine is 1:0.5-2; then, pyromellitic dianhydride is added in four portions, and the total amount added is 0.9 times the molar number of the diamine monomer containing a bisimide moiety, and the addition method is to add the pyromellitic dianhydride in four equal portions, with the time interval between each addition of pyromellitic dianhydride being 20 minutes; after the reaction is complete, a self-healing polyimide liquid is obtained;

[0007] The preparation process of the diamine monomer containing a bisimide unit comprises the following steps: adding 0.01 mmol of 4,4'-diaminodiphenyl ether and 20 mL of acetone to a dry three-necked flask equipped with an electromagnetic stirrer under nitrogen protection; slowly dripping 20 mL of acetone in which 0.01 mmol of maleic anhydride is dissolved, and the maleic anhydride is completely added within 30 minutes; stirring is continued at 150 rpm for 2 hours to allow the reaction to proceed completely; and after the reaction is completed, filtering, rinsing with acetone, and recrystallizing with ethanol to obtain the diamine monomer containing a bisimide unit.

[0008] Further, the method comprises the following preparation steps:

[0009] (1) The optical fiber preform is fed into a furnace at a temperature of 2000-2200℃ by a feeding system and heated. After the preform is softened, it is pulled out from the lower outlet of the furnace at a speed of more than 800-1600m / min in the form of a filament. A certain error in the diameter of the optical fiber is allowed.

[0010] (2) After melt drawing, the optical fiber is annealed and cooled at room temperature and then directly enters the inner coating mold. The maximum outer diameter of the inner coating layer is 200 μm, and the coating pressure of the inner coating layer is 2.5 bar;

[0011] (3) After the inner layer is coated, the optical fiber quickly enters the outer layer coating mold. The maximum outer diameter of the outer coating is 250 μm, the coating pressure of the outer coating is 5 bar, and the outer coating material is self-healing polyimide;

[0012] (4) The optical fiber after double coating is cured under high power of 6 UV lamps; after the curing is completed, it is wound with an automatic winding device to prepare an optical fiber for high temperature non-fading and non-migration optical cable.

[0013] Furthermore, the coating temperature in steps (2) and (3) is maintained at 40°C.

[0014] Furthermore, the inner coating layer material in step (2) is a homemade modified acrylic resin.

[0015] Furthermore, the preparation process of the homemade modified acrylic resin is as follows: according to parts by weight, 1-3 parts of 2-hydroxy-4-(3-methacrylate-2-hydroxypropoxy)benzophenone, 15-25 parts of butyl acrylate, 2 parts of methyl methacrylate, 0.5 parts of methacrylic acid, 0.03 parts of benzoyl peroxide, 20 parts of butanone, and 0.15-0.55 parts of 3-aminopropylmethyldimethoxysilane are weighed, stirred at 150 rpm for 20 minutes to mix evenly, and then added to a light-shielded reactor, stirred at 150 rpm in an 80°C water bath for 60 minutes to obtain a modified acrylic resin.

[0016] Furthermore, the UV lamp in step (4) is a 3W high-power lamp.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0018] The present invention uses a melt-drawn optical fiber to modify an acrylic inner coating layer and a self-repairing polyimide outer coating layer to achieve a high-temperature stable effect.

[0019] First, a curing monomer and 3-aminopropylmethyldimethoxysilane are added to the acrylic resin of the inner coating layer. The additives do not contain small-molecule active substances, thus preventing the migration of small-molecule active substances during storage. Their application to the acrylic resin can impart excellent high-temperature resistance. The aminosilicone can enhance the adhesion between the high-temperature resistant acrylate layer and the polyimide layer, while also improving the viscosity of the acrylic film after the curing monomer is added, ensuring that the inner coating layer remains stable, does not peel, and does not fade even under high-temperature conditions.

[0020] Secondly, a diamine monomer containing a maleimide group and a bisimide unit was synthesized using maleic anhydride and 4,4'-diaminodiphenyl ether as diamine monomers as reaction raw materials. The diamine monomer was reacted with p-phenylenediamine and pyromellitic dianhydride through an amine-aldehyde condensation reaction to prepare a thermosetting polyimide film with a dynamic imine bond in the molecular main chain. This film was used as an outer coating layer and cured quickly. This film not only has excellent heat resistance, but also utilizes the primary amine group in the aminosilane coupling agent added to the inner coating layer to promote the reversible imide bond exchange reaction, thereby realizing the self-repair of the thermosetting polyimide film under mild conditions. After long-term use, the large area of ​​delamination between the modified acrylic layer and the polyimide layer of the optical fiber can be repaired, thereby improving the high temperature resistance of the optical fiber. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of an optical fiber for a high-temperature non-fading and non-migration optical cable prepared in the following examples.

[0023] High-temperature stability: Delamination ratio between the inner and outer coatings of a double-coated optical fiber tested at 250°C for 30 days. Typical values ​​of added attenuation at 150°C are measured in accordance with Section 40 of GB-T15972.40-2008. Example 1

[0024] (1) The optical fiber preform is fed into a 2000℃ high temperature furnace by a feeding system for heating. After the preform softens, it is pulled out from the lower outlet of the furnace at a speed of more than 800m / min in the form of a filament. A certain error in the diameter of the optical fiber is allowed.

[0025] (2) According to the weight ratio, 1 part of 2-hydroxy-4-(3-methacrylate-2-hydroxypropoxy)benzophenone, 15 parts of butyl acrylate, 2 parts of methyl methacrylate, 0.5 parts of methacrylic acid, 0.03 parts of benzoyl peroxide, 20 parts of butanone, and 0.15 parts of 3-aminopropylmethyldimethoxysilane were weighed, stirred at 150 rpm for 20 minutes to mix evenly, and then added to a light-shielded reactor, stirred at 150 rpm in an 80°C water bath for 60 minutes to prepare a modified acrylic resin; the optical fiber after melt drawing was directly put into the inner coating mold after annealing and cooling at room temperature, and the coating temperature was maintained at 40°C. The inner coating material was a homemade modified acrylic resin, the maximum outer diameter of the inner coating was 200 μm, and the coating pressure of the inner coating was 2.5 bar;

[0026] (3) In a dry three-necked flask equipped with an electromagnetic stirrer, under nitrogen protection, add 0.01mmol of 4,4'-diaminodiphenyl ether and 20mL of acetone; slowly drop 20mL of acetone dissolved with 0.01mmol of maleic anhydride, and complete the addition of maleic anhydride within 30min. Continue stirring at 150rpm for 2h to complete the reaction; after the reaction is completed, filter, rinse with acetone, and recrystallize with ethanol to obtain a diamine monomer containing a diimide unit; first weigh a certain amount of diamine monomer containing a diimide unit into a three-necked flask, then add p-phenylenediamine and stir at high speed to completely dissolve it. The mass ratio of diamine monomer containing a diimide unit to p-phenylenediamine is 1:0.5. ; Then, 0.9 times the molar amount of the diamine monomer containing the bisimide unit is added in 4 times, and the addition method of the pyromellitic dianhydride is the dichotomy method, and the addition is made in 4 times, and the time interval between each addition of the pyromellitic dianhydride is 20 minutes; after the reaction is complete, a self-healing polyimide liquid is obtained; after the inner layer is coated, the optical fiber quickly enters the mold for outer layer coating, and the coating temperature is maintained at 40°C. The outer coating material is the self-healing polyimide liquid, the maximum outer diameter of the outer coating is 250μm, and the coating pressure of the outer coating is 5bar;

[0027] (4) The optical fiber after double coating is cured under high power of 6 3W high power UV lamps; after the curing is completed, it is wound with an automatic winding device to prepare an optical fiber for high temperature non-fading and non-migration optical cable. Example 2

[0028] (1) The optical fiber preform is fed into a 2100°C high-temperature furnace by a feeding system for heating. After the preform softens, it is pulled out from the lower outlet of the furnace at a speed of more than 1200m / min in the form of a filament. A certain error in the diameter of the optical fiber is allowed.

[0029] (2) According to the weight ratio, 2 parts of 2-hydroxy-4-(3-methacrylate-2-hydroxypropoxy)benzophenone, 20 parts of butyl acrylate, 2 parts of methyl methacrylate, 0.5 parts of methacrylic acid, 0.03 parts of benzoyl peroxide, 20 parts of butanone, and 0.30 parts of 3-aminopropylmethyldimethoxysilane were weighed, stirred at 150 rpm for 20 minutes, and then added to a light-shielded reactor. The mixture was stirred at 150 rpm in an 80°C water bath for 60 minutes to prepare a modified acrylic resin. After the melt-drawn optical fiber was annealed and cooled at room temperature, it was directly placed into the mold for inner coating. The coating temperature was maintained at 40°C. The inner coating material was a homemade modified acrylic resin. The maximum outer diameter of the inner coating was 200 μm, and the coating pressure of the inner coating was 2.5 bar.

[0030] (3) In a dry three-necked flask equipped with an electromagnetic stirrer, under nitrogen protection, add 0.01mmol of 4,4'-diaminodiphenyl ether and 20mL of acetone; slowly drop 20mL of acetone dissolved with 0.01mmol of maleic anhydride, and complete the addition of maleic anhydride within 30min. Continue stirring at 150rpm for 2h to complete the reaction; after the reaction is completed, filter, rinse with acetone, and recrystallize with ethanol to obtain a diamine monomer containing a diimide unit; first weigh a certain amount of diamine monomer containing a diimide unit into a three-necked flask, then add p-phenylenediamine and stir at high speed to completely dissolve it. The mass ratio of diamine monomer containing a diimide unit to p-phenylenediamine is 1:1.5. ; Then, 0.9 times the molar amount of the diamine monomer containing the bisimide unit is added in 4 times, and the addition method of the pyromellitic dianhydride is the dichotomy method, and the addition is made in 4 times, and the time interval between each addition of the pyromellitic dianhydride is 20 minutes; after the reaction is complete, a self-healing polyimide liquid is obtained; after the inner layer is coated, the optical fiber quickly enters the mold for outer layer coating, and the coating temperature is maintained at 40°C. The outer coating material is the self-healing polyimide liquid, the maximum outer diameter of the outer coating is 250μm, and the coating pressure of the outer coating is 5bar;

[0031] (4) The optical fiber after double coating is cured under high power of 6 3W high power UV lamps; after the curing is completed, it is wound with an automatic winding device to prepare an optical fiber for high temperature non-fading and non-migration optical cable. Example 3

[0032] (1) The optical fiber preform is fed into a 2200°C high-temperature furnace by a feeding system for heating. After the preform softens, it is pulled out from the lower outlet of the furnace at a speed of more than 1600 m / min in the form of a filament. A certain error in the diameter of the optical fiber preform is allowed.

[0033] (2) According to the weight ratio, 3 parts of 2-hydroxy-4-(3-methacrylate-2-hydroxypropoxy)benzophenone, 25 parts of butyl acrylate, 2 parts of methyl methacrylate, 0.5 parts of methacrylic acid, 0.03 parts of benzoyl peroxide, 20 parts of butanone, and 0.55 parts of 3-aminopropylmethyldimethoxysilane were weighed, stirred at 150 rpm for 20 minutes to mix evenly, and then added to a light-shielded reactor, stirred at 150 rpm in an 80°C water bath for 60 minutes to prepare a modified acrylic resin; the optical fiber after melt drawing was directly put into the inner coating mold after annealing and cooling at room temperature, and the coating temperature was maintained at 40°C. The inner coating material was a homemade modified acrylic resin, the maximum outer diameter of the inner coating was 200 μm, and the coating pressure of the inner coating was 2.5 bar;

[0034] (3) In a dry three-necked flask equipped with an electromagnetic stirrer, under nitrogen protection, add 0.01mmol of 4,4'-diaminodiphenyl ether and 20mL of acetone; slowly drop 20mL of acetone dissolved with 0.01mmol of maleic anhydride, and complete the addition of maleic anhydride within 30min. Continue stirring at 150rpm for 2h to complete the reaction; after the reaction is completed, filter, rinse with acetone, and recrystallize with ethanol to obtain a diamine monomer containing a diimide unit; first weigh a certain amount of diamine monomer containing a diimide unit into a three-necked flask, then add p-phenylenediamine and stir at high speed to completely dissolve it. The mass ratio of diamine monomer containing a diimide unit to p-phenylenediamine is 1:2; Then, 0.9 times the molar amount of the diamine monomer containing a bisimide unit is added to the optical fiber in four portions. The addition of the optical fiber is carried out by a dichotomous method, and the time interval between each addition of the optical fiber is 20 minutes. After the reaction is complete, a self-healing polyimide solution is obtained. After the inner layer is coated, the optical fiber is quickly placed in a mold for outer coating. The coating temperature is maintained at 40°C. The outer coating material is the self-healing polyimide solution. The maximum outer diameter of the outer coating is 250 μm, and the coating pressure of the outer coating is 5 bar.

[0035] (4) The optical fiber after double coating is cured under high power of 6 3W high power UV lamps; after the curing is completed, it is wound with an automatic winding device to prepare an optical fiber for high temperature non-fading and non-migration optical cable.

[0036] Comparative Example 1

[0037] The difference between Comparative Example 1 and Example 2 lies in step (3). Step (3) is changed to: after the inner layer is coated, the optical fiber quickly enters the outer layer coating mold, the coating temperature is maintained at 40°C, the outer coating material is isophthalic polyimide, the maximum outer diameter of the outer coating is 250 μm, and the coating pressure of the outer coating is 5 bar; the remaining steps are the same as in Example 2.

[0038] Comparative Example 2

[0039] The difference between Comparative Example 2 and Example 2 lies in the difference in step (2). Step (2) is changed to: 2 parts of 2-hydroxy-4-(3-methacrylate-2-hydroxypropoxy)benzophenone, 20 parts of butyl acrylate, 2 parts of methyl methacrylate, 0.5 parts of methacrylic acid, 0.03 parts of benzoyl peroxide, and 20 parts of butanone are weighed in parts by weight, stirred at 150 rpm for 20 minutes, and then added to a light-shielded reactor. The mixture is stirred in an 80°C water bath at 150 rpm for 60 minutes to obtain a modified acrylic resin. After the melt-drawn optical fiber is annealed and cooled at room temperature, it is directly placed in a mold for inner coating. The coating temperature is maintained at 40°C. The inner coating material is a homemade modified acrylic resin. The maximum outer diameter of the inner coating is 200 μm, and the coating pressure of the inner coating is 2.5 bar. The remaining steps are the same as those in Example 2.

[0040] Comparative Example 3

[0041] The difference between Comparative Example 3 and Example 2 lies in step (2). Step (2) is changed to: 20 parts of butyl acrylate, 2 parts of methyl methacrylate, 0.5 parts of methacrylic acid, 0.03 parts of benzoyl peroxide, 20 parts of butanone, and 0.30 parts of 3-aminopropylmethyldimethoxysilane are weighed in parts by weight, stirred at 150 rpm for 20 minutes to mix evenly, and then added to a light-shielding reactor, stirred and reacted in an 80°C water bath at 150 rpm for 60 minutes to obtain a modified acrylic resin; the optical fiber after melt drawing is directly placed into an inner layer coating mold after annealing and cooling at room temperature, the coating temperature is maintained at 40°C, the inner coating material is a homemade modified acrylic resin, the maximum outer diameter of the inner coating is 200 μm, and the coating pressure of the inner coating is 2.5 bar; the remaining steps are the same as in Example 2.

[0042] Effect Examples

[0043] Table 1 below shows the performance analysis results of an optical fiber for a high-temperature non-fading and non-migration optical cable using Examples 1 to 3 of the present invention and Comparative Examples 1 to 3.

[0044] Table 1

[0045]

[0046] From the comparison of the experimental data of high temperature resistance of the embodiment and the comparative example, it can be found that the present invention adds a curing monomer and 3-aminopropylmethyldimethoxysilane to the acrylic resin of the inner coating layer, and the additive does not contain small molecular active substances, thereby avoiding the migration phenomenon of small molecular active substances during storage. Applying it to the acrylic resin can make the acrylic resin have excellent high temperature resistance; aminosilicone can enhance the adhesion between the high temperature resistant acrylate layer and the polyimide layer, and at the same time can improve the viscosity of the acrylic film after the curing monomer is added, so that the inner coating layer still does not migrate, fall off or fade under high temperature conditions. The present invention uses maleic anhydride and 4,4'-diaminodiphenyl ether as diamine monomers as reaction raw materials to synthesize a diamine monomer containing a maleimide group in its molecular structure. The diamine monomer is reacted with p-phenylenediamine and pyromellitic dianhydride through an amine-aldehyde condensation reaction to prepare a thermosetting polyimide film with a dynamic imine bond in the molecular main chain. The film is used as an outer coating layer, which not only has excellent heat resistance, but also utilizes the primary amine group in the aminosilane coupling agent added to the inner coating layer to promote the reversible imide bond exchange reaction, thereby achieving self-repair of the thermosetting polyimide film under mild conditions. After long-term use of the optical fiber, large-area delamination between the modified acrylic layer and the polyimide layer can be repaired, thereby improving the high-temperature resistance of the optical fiber.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed therein. Any reference in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A method for preparing an optical fiber for a high-temperature non-fading and non-migration optical cable, characterized in that: The optical fiber for the optical cable is prepared by applying a modified acrylic inner coating layer and a self-repairing polyimide outer coating layer to a melt-drawn optical fiber; the self-repairing polyimide is prepared using a diamine monomer containing a maleimide group and a bisimide unit as a raw material; The preparation process of the self-healing polyimide is as follows: first, a certain amount of diamine monomer containing a bisimide moiety is weighed into a three-necked flask, and then p-phenylenediamine is added and stirred at high speed to completely dissolve it, wherein the mass ratio of the diamine monomer containing a bisimide moiety to p-phenylenediamine is 1:0.5-2; then, pyromellitic dianhydride is added in four portions, and the total amount added is 0.9 times the molar number of the diamine monomer containing a bisimide moiety, and the addition method is to add the pyromellitic dianhydride in four equal portions, with the time interval between each addition of pyromellitic dianhydride being 20 minutes; after the reaction is complete, a self-healing polyimide liquid is obtained; The preparation process of the diamine monomer containing a bisimide unit comprises the following steps: adding 0.01 mmol of 4,4'-diaminodiphenyl ether and 20 mL of acetone to a dry three-necked flask equipped with an electromagnetic stirrer under nitrogen protection; slowly dripping 20 mL of acetone in which 0.01 mmol of maleic anhydride is dissolved, and the maleic anhydride is completely added within 30 minutes; stirring is continued at 150 rpm for 2 hours to allow the reaction to proceed completely; and after the reaction is completed, filtering, rinsing with acetone, and recrystallizing with ethanol to obtain the diamine monomer containing a bisimide unit.

2. The method for preparing an optical fiber for a high-temperature non-fading and non-migration optical cable according to claim 1, characterized in that: The method comprises the following preparation steps: (1) The optical fiber preform is fed into a furnace at a temperature of 2000-2200℃ by a feeding system and heated. After the preform is softened, it is pulled out from the lower outlet of the furnace at a speed of more than 800-1600m / min in the form of a filament. A certain error in the diameter of the optical fiber is allowed. (2) After melt drawing, the optical fiber is annealed and cooled at room temperature and then directly enters the inner coating mold. The maximum outer diameter of the inner coating layer is 200 μm, and the coating pressure of the inner coating layer is 2.5 bar; (3) After the inner layer is coated, the optical fiber quickly enters the outer layer coating mold. The maximum outer diameter of the outer coating is 250 μm, the coating pressure of the outer coating is 5 bar, and the outer coating material is self-healing polyimide; (4) The optical fiber after double coating is cured under high power of 6 UV lamps; after the curing is completed, it is wound with an automatic winding device to prepare an optical fiber for high temperature non-fading and non-migration optical cable.

3. The method for preparing an optical fiber for a high-temperature non-fading and non-migration optical cable according to claim 2, characterized in that: In the steps (2) and (3), the coating temperature is maintained at 40°C.

4. The method for preparing an optical fiber for a high-temperature non-fading and non-migration optical cable according to claim 2, characterized in that: The inner coating layer material in step (2) is a homemade modified acrylic resin.

5. The method for preparing an optical fiber for a high-temperature non-fading and non-migration optical cable according to claim 4, characterized in that: The preparation process of the homemade modified acrylic resin is as follows: 1-3 parts of 2-hydroxy-4-(3-methacrylate-2-hydroxypropoxy)benzophenone, 15-25 parts of butyl acrylate, 2 parts of methyl methacrylate, 0.5 part of methacrylic acid, 0.03 part of benzoyl peroxide, 20 parts of butanone, and 0.15-0.55 parts of 3-aminopropylmethyldimethoxysilane are weighed in parts by weight; the mixture is stirred at 150 rpm for 20 minutes to mix evenly; the mixture is then added to a light-shielded reactor; and the mixture is stirred and reacted in a water bath at 80°C and 150 rpm for 60 minutes to obtain the modified acrylic resin.

6. The method for preparing an optical fiber for a high-temperature non-fading and non-migration optical cable according to claim 2, characterized in that: The UV lamp in step (4) is a 3W high-power lamp.

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