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Ultraviolet light cross-linked polyphosphazene, preparation method, composite coating low temperature temperature measuring optical fiber, and preparation method

A temperature-measuring optical fiber and composite coating technology, which is applied in clad optical fiber, multi-layer core/clad optical fiber, coating, etc., can solve the problem of difficult to meet the temperature measurement requirements of high-temperature superconducting equipment and the interference of electrical signal sensors , low-temperature sensitivity degradation of optical fiber, etc., to avoid cracking and interface bonding force deterioration, no side reactions, and good thermal stability

Active Publication Date: 2021-06-15
EASTERN SUPERCONDUCTOR SCI & TECH SUZHOU CO LTD
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  • Abstract
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Problems solved by technology

[0003] At present, the temperature measurement and control of superconducting equipment mainly faces two problems: First, most high-temperature superconducting equipment works at the temperature of liquid nitrogen, and the sensors for temperature monitoring at low temperatures are mostly electrical signal sensors such as thermal resistors and thermocouples. Conductive equipment often operates in high-voltage, high-current, strong magnetic field and other working conditions. The electrical signal sensor is greatly disturbed by the electromagnetic field, and the test accuracy will be seriously affected. It is difficult to meet the temperature measurement requirements of high-temperature superconducting equipment.
[0005] However, one of the challenges that the Rayleigh scattering-based distributed optical fiber sensing technology must overcome is the high temperature sensitivity of the measuring fiber at low temperature.
Early studies have shown that coating polymers with high thermal expansion coefficients (polyimide, polymethyl acrylate) on the surface of bare optical fibers can improve the temperature sensitivity coefficient of optical fibers in low temperature environments to a certain extent, but the improvement effect is not significant
In recent years, metal (such as Sn) coatings have been coated on the surface of optical fibers coated with polymethyl acrylate coatings by melting method, making full use of the synergistic effect of Young's modulus (E) and coefficient of thermal expansion (CTE) of composite coatings. , the sensitivity of the prepared composite coated optical fiber is improved at low temperature, but due to the high temperature process of melting and coating metal, the inner polymethylacrylate coating will be pyrolyzed, resulting in "bare optical fiber and polymethylacrylate coating" The interfacial bonding between the "layers" and "polymethyl acrylate coating and metal coating" is significantly reduced, which eventually leads to the degradation or loss of the low temperature sensitivity of the optical fiber

Method used

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  • Ultraviolet light cross-linked polyphosphazene, preparation method, composite coating low temperature temperature measuring optical fiber, and preparation method
  • Ultraviolet light cross-linked polyphosphazene, preparation method, composite coating low temperature temperature measuring optical fiber, and preparation method
  • Ultraviolet light cross-linked polyphosphazene, preparation method, composite coating low temperature temperature measuring optical fiber, and preparation method

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Embodiment 1

[0040] This embodiment first prepares PBEMP, comprises the following process:

[0041] First, 0.05 mole of sodium butoxyalkoxide, 0.10 mole of sodium glycidoxyl alkoxide and 0.05 mole of sodium hydroxyethyl methacrylate were dissolved in 1000 ml of dry tetrahydrofuran solvent to prepare a nucleophilic substitution salt solution;

[0042] Subsequently, the above-mentioned salt solution was slowly added dropwise to 500 ml of dry tetrahydrofuran solution containing 0.1 mole of polydichlorophosphazene under ice-water bath conditions, and the reactants were stirred and reacted for 24 hours at room temperature and under nitrogen protection conditions; after the reaction, The reaction product is extracted and dried to obtain [N=P] n (OC 4 h 9 ) 0.25 (OCH 2 CHOCH 2 ) 0.50 (OCH 2 CH 2 OOCC (CH 3 )=CH 2 ) 0.25 , number average molecular weight M n >10000.

[0043] Next, PBEMP is used to make a composite coated cryogenic temperature measurement optical fiber, including the f...

Embodiment 2

[0049] This embodiment first prepares PBEMP, comprises the following process:

[0050] First, 0.10 mole of sodium butoxyalkoxide, 0.05 mole of sodium glycidoxyl alkoxide and 0.05 mole of sodium hydroxyethyl methacrylate were dissolved in 1000 ml of dry tetrahydrofuran solvent to prepare a nucleophilic substitution salt solution;

[0051] Subsequently, the above-mentioned salt solution was slowly added dropwise to 500 ml of dry tetrahydrofuran solution containing 0.1 mole of polydichlorophosphazene under ice-water bath conditions, and the reactants were stirred and reacted for 24 hours at room temperature and under nitrogen protection conditions; after the reaction, The reaction product is extracted and dried to obtain [N=P] n (OC 4 h 9 ) 0.50 (OCH 2 CHOCH 2 ) 0.25 (OCH 2 CH 2 OOCC (CH 3 )=CH 2 ) 0.25 , number average molecular weight M n >10000.

[0052] Next, PBEMP is used to make a composite coated cryogenic temperature measurement optical fiber, including the f...

Embodiment 3

[0057] This embodiment first prepares PBEMP, comprises the following process:

[0058] First, 0.09 mole of sodium butoxyalkoxide, 0.09 mole of sodium glycidoxyl alkoxide and 0.02 mole of sodium hydroxyethyl methacrylate were dissolved in 1000 ml of dry tetrahydrofuran solvent to prepare a nucleophilic substitution salt solution;

[0059] Subsequently, the above-mentioned salt solution was slowly added dropwise to 500 ml of dry tetrahydrofuran solution containing 0.1 mole of polydichlorophosphazene under ice-water bath conditions, and the reactants were stirred and reacted for 24 hours at room temperature and under nitrogen protection conditions; after the reaction, The reaction product is extracted and dried to obtain [N=P] n (OC 4 h 9 ) 0.45 (OCH 2 CHOCH 2 ) 0.45 (OCH 2 CH 2 OOCC (CH 3 )=CH 2 ) 0.10 , number average molecular weight M n >10000.

[0060] Next, PBEMP is used to make a composite coated cryogenic temperature measurement optical fiber, including the f...

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Abstract

The invention relates to an ultraviolet light cross-linked polyphosphazene, a preparation method, a composite coated low-temperature temperature-measuring optical fiber, and a preparation method, belonging to the technical field of optical fiber manufacturing. The preparation method of the composite coating low-temperature temperature-measuring optical fiber comprises the following steps: S1, dispersing ultraviolet light cross-linked polyphosphazene in tetrahydrofuran solvent, mixing with ultraviolet photoinitiator and polymerization aid, fully stirring and degassing, and preparing The coating liquid is obtained; S2, the coating liquid is placed in the coating mold, the bare optical fiber passes through the coating mold, carries the coating liquid and passes through the UV curing furnace under the protection of nitrogen; A polyphosphazene elastic coating is formed on the surface of the bare optical fiber; S3, the optical fiber with the polyphosphazene elastic coating is passed through a secondary coating mold filled with low melting point molten metal, and the metal is coated on the surface of the polyphosphazene elastic coating Melt, and finally get the composite coating cryogenic temperature measurement optical fiber. The invention can overcome the disadvantages of cracking of the polymer coating and deterioration of interfacial bonding force in the process of metal fusion coating in the traditional composite coated optical fiber.

Description

technical field [0001] The invention relates to a technology in the field of optical fiber manufacturing, in particular to an ultraviolet light cross-linked polyphosphazene, a preparation method, a composite coated low-temperature temperature-measuring optical fiber, and a preparation method. Background technique [0002] Superconducting equipment has the characteristics of low loss and high current carrying capacity, and has attracted extensive attention from the power industry. However, superconducting devices have always faced the risk of quench failure. Due to the thermal effect of the resistance after quenching, the heat in the local area will accumulate rapidly and the temperature will rise. If it cannot be found in time and dealt with accordingly, the thermal effect accumulation will cause the cooling medium in the confined space to boil, the strip will burn, and even lead to more serious problems. risks of. Therefore, monitoring the temperature changes in various p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G79/025C09D185/02G02B6/036C03C25/1065C03C25/16
CPCC08G79/025C09D185/02G02B6/036C03C25/109C03C25/16
Inventor 袁文蔡渊包颖熊旭明牛潇晔
Owner EASTERN SUPERCONDUCTOR SCI & TECH SUZHOU CO LTD
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