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Self-repairing aramid fiber reinforced core for optical cable, and preparation method of self-repairing aramid fiber reinforced core

An aramid fiber strengthening and self-repairing technology, which is applied in the field of optical cables and optical cable materials, can solve the problems of low interlayer shear strength, high degree of orientation of molecular chains on the surface, and material damage, so as to improve mechanical properties and service life, enhance Self-healing performance, the effect of enhancing overall performance

Active Publication Date: 2019-03-22
安徽牡东通讯光缆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although aramid fibers have many excellent mechanical and chemical properties, their surface molecular chains have a high degree of orientation and high crystallinity, and the large steric hindrance of the benzene ring makes it difficult for the hydrogen on the amide group to interact with other atomic reactions
In addition, the surface of aramid fibers is smooth and lacks active functional groups that can interact with polymer composites in the form of covalent bonds or hydrogen bonds, all of which lead to poor wettability of aramid fibers. Poor interfacial adhesion and low interlayer shear strength severely degrade the performance of aramid composites
Aramid fiber used as a cable reinforcement core is extremely vulnerable to mechanical deformation and material damage during actual use. Therefore, providing an aramid fiber reinforcement core with self-repairing properties is beneficial to prolong the service life of the cable and improve the overall performance of the cable.

Method used

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  • Self-repairing aramid fiber reinforced core for optical cable, and preparation method of self-repairing aramid fiber reinforced core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A self-repairing aramid fiber reinforced core for optical cable, comprising an aramid fiber substrate, a polydopamine layer on the surface of the aramid fiber substrate, and a polyurethane layer coated on the surface of the polydopamine layer; the polyurethane layer is doped with boron nitride nanosheets ; The content of boron nitride nanosheets in the polyurethane layer is 5wt%; the thickness of the polyurethane layer is 0.5mm;

[0030] The polyurethane in the polyurethane layer is self-healing polyurethane, and the preparation process of self-healing polyurethane includes:

[0031] S1. Mix diphenylmethane diisocyanate and poly-1,4-butylene adipate diol in a molar ratio of 1.8:1, add DMF to dissolve, heat up to 70°C for 3 hours in a nitrogen atmosphere, and cool down to 0°C; add furfurylamine dropwise to react for 2 hours, raise the temperature to 30°C, continue to react for 4 hours, precipitate and filter to obtain a furan-terminated intermediate; wherein, the molar v...

Embodiment 2

[0038] A self-repairing aramid fiber reinforced core for optical cable, comprising an aramid fiber substrate, a polydopamine layer on the surface of the aramid fiber substrate, and a polyurethane layer coated on the surface of the polydopamine layer; the polyurethane layer is doped with boron nitride nanosheets ; The content of boron nitride nanosheets in the polyurethane layer is 15wt%; the thickness of the polyurethane layer is 3mm;

[0039] The polyurethane in the polyurethane layer is self-healing polyurethane, and the preparation process of self-healing polyurethane includes:

[0040] S1. Mix diphenylmethane diisocyanate and poly-1,4-butylene adipate diol in a molar ratio of 2.2:1, add DMF to dissolve, heat up to 80°C for 2 hours in a nitrogen atmosphere, and cool down to 5°C; add furfurylamine dropwise for 1 hour, raise the temperature to 40°C, continue the reaction for 3 hours, precipitate and filter to obtain a furan-terminated intermediate; wherein, the molar volume r...

Embodiment 3

[0047] A self-repairing aramid fiber reinforced core for optical cable, comprising an aramid fiber substrate, a polydopamine layer on the surface of the aramid fiber substrate, and a polyurethane layer coated on the surface of the polydopamine layer; the polyurethane layer is doped with boron nitride nanosheets ; The content of boron nitride nanosheets in the polyurethane layer is 10wt%; the thickness of the polyurethane layer is 2mm;

[0048] The polyurethane in the polyurethane layer is self-healing polyurethane, and the preparation process of self-healing polyurethane includes:

[0049] S1. Mix diphenylmethane diisocyanate and poly-1,4-butylene adipate diol in a molar ratio of 2:1, add DMF to dissolve, heat up to 75°C in a nitrogen atmosphere and react for 2.5h, then cool down to 3°C; add furfurylamine dropwise to react for 1.5h, raise the temperature to 35°C, continue to react for 3.5h, precipitate and filter to obtain a furan-terminated intermediate; wherein, the molar vo...

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Abstract

The invention discloses a self-repairing aramid fiber reinforced core for an optical cable. The self-repairing aramid fiber reinforced core comprises an aramid fiber base body, a polydopamine layer arranged on the surface of the aramid fiber base body, and a polyurethane layer, wherein the surface of the polydopamine layer is coated with the polyurethane layer; the polyurethane layer is internallydoped with boron nitride nanosheets; the invention also discloses a preparation method of the self-repairing aramid fiber reinforced core for the optical cable; the method comprises the following steps: a. depositing polydopamine; b. coating with the polyurethane layer; c. curing for molding. The polydopamine layer and the polyurethane layer are sequentially arranged on the surface of the aramidfiber base body; due to the cooperation of the two layers of functional materials, the self-repairing performance of the aramid fiber reinforced core is enhanced, the mechanical properties of the reinforced core for the optical cable is improved, and the service life of the reinforced core is prolonged.

Description

technical field [0001] The invention relates to the technical field of optical cables and optical cable materials, in particular to a self-repairing aramid fiber reinforcing core for optical cables and a preparation method thereof. Background technique [0002] Aramid fibers can be used as reinforcements in many fields due to their low density, good breaking strength, high insulation, high flame retardancy and high modulus. However, although aramid fibers have many excellent mechanical and chemical properties, their surface molecular chains have a high degree of orientation and high crystallinity, and the large steric hindrance of the benzene ring makes it difficult for the hydrogen on the amide group to interact with other atomic reactions. In addition, the surface of aramid fibers is smooth and lacks active functional groups that can interact with polymer composites in the form of covalent bonds or hydrogen bonds, all of which lead to poor wettability of aramid fibers. P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/37D06M15/572D06M11/80D06M101/36G02B6/44
CPCD06M11/80D06M15/37D06M15/572D06M2101/36G02B6/4432
Inventor 夏道友
Owner 安徽牡东通讯光缆有限公司
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