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Surface modified aramid fiber and preparation method thereof

A kind of aramid fiber, surface modification technology, applied in the direction of fiber type, fiber treatment, light/infrared/X-ray fiber treatment, etc., can solve the problem of limited bonding force between inorganic materials and organic fibers, poor heat resistance and oxidation resistance, Organic fiber photocatalytic degradation and other problems, to ensure service reliability, high heat resistance, improve tensile strength and work at break.

Active Publication Date: 2018-10-12
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organic UV shielding agents have poor heat resistance and oxidation resistance
These problems are well controlled in inorganic UV shielding agents, but there is a problem of high catalytic activity, which brings the risk of photocatalytic degradation to organic fibers; in addition, the binding force between inorganic materials and organic fibers is limited, and during use There will be a problem of shedding, which will affect the service reliability

Method used

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  • Surface modified aramid fiber and preparation method thereof
  • Surface modified aramid fiber and preparation method thereof
  • Surface modified aramid fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Preparation of surface modified aramid fiber

[0051] (1) 1g of aramid fiber (Kevlar-49, diameter 12μm, density 1.45g / m 3 , produced by DuPont, USA) were immersed in acetone at 70°C, petroleum ether at 75°C, and deionized water at 115°C in turn, and kept for 3 hours respectively; then the fibers were taken out and dried in a vacuum oven at 80°C to obtain clean aramid fibers. is KF;

[0052] (2) Dissolve 10.5g of sodium hydroxide in 120mL of ethanol to prepare ethanol solution A of sodium hydroxide; immerse the clean aramid fiber KF obtained in step (1) in the above solution A, shake at 65°C React for 5h, after the reaction finishes, wash and dry to obtain aramid fibers with amino groups and carboxyl groups on the surface;

[0053] (3) Add 0.25g of aramid fibers with amino and carboxyl groups on the surface and 30mL of γ-glycidyl etheroxypropyltrimethoxysilane to 70mL of ethanol, and react at 70°C for 12h under a nitrogen atmosphere; after the reaction , take out t...

Embodiment 2

[0065] 1. Preparation of surface modified aramid fiber

[0066] Disperse 0.5g of silicon-containing methoxy aramid fibers prepared in step (6) of Example 1, and 3.75g of polydopamine-modified turbostratic boron nitride-coated cerium oxide in an aqueous solution, and shake for 6 hours at a temperature of 60°C After the reaction, the fiber is taken out, washed and dried. Obtain surface-modified aramid fibers, denoted as T-KF2, its infrared spectrum, scanning electron microscope (SEM) photos, tensile properties and work-to-break refer to the attached Figure 5 , 6 and 7, surface contact angles and free energies are shown in Table 1.

[0067] 2. Ultraviolet irradiation of clean fiber and modified fiber

[0068] According to the same steps and conditions of embodiment 1, the aramid fiber T-KF2 that obtains in embodiment 2 is carried out the UV irradiation of 168h, obtains the 168h ultraviolet radiation fiber, is denoted as UV-T-KF2, its tensile properties and Work of fracture s...

Embodiment 3

[0077] 1. Preparation of surface modified aramid fiber

[0078] (1) 1g of aramid fiber (Kevlar-49, diameter 12μm, density 1.45g / m 3 , produced by DuPont, USA) were immersed in acetone at 70°C, petroleum ether at 75°C, and deionized water at 115°C in turn, and kept for 3 hours respectively; then the fibers were taken out and dried in a vacuum oven at 80°C to obtain clean aramid fibers. for KF.

[0079] (2) Dissolve 10.5g of sodium hydroxide in 120mL of ethanol to prepare ethanol solution A of sodium hydroxide; immerse the clean aramid fiber KF obtained in step (1) in the above solution A, shake at 65°C After reacting for 5 hours, after the reaction, washing and drying are carried out to obtain aramid fibers with amino groups and carboxyl groups on the surface.

[0080] (3) Add 0.25g of aramid fibers with amino and carboxyl groups on the surface and 30mL of γ-glycidyl etheroxypropyltrimethoxysilane to 70mL of ethanol, and react at 70°C for 12h under a nitrogen atmosphere; afte...

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Abstract

The invention relates to surface modified aramid fiber and a preparation method thereof. The method comprises the following steps: aramid fiber with an amino group and a carboxyl group on the surfaceis modified with a siloxane gamma-glycidyloxypropyltrimethoxysilane in order to obtain silicon methoxylated aramid fiber; and the silicon methoxylated aramid fiber and polydopamine modified turbostratic boron nitride coated cerium oxide are reacted in order to obtain surface modified aramid fiber. Polydopamine modified turbostratic boron nitride coated cerium oxide has high ultraviolet absorption,at the same time has extremely low catalytic activity, in order to avoid destroy of photocatalysis on the fiber structure in a radiation process, and is an effective and safe high efficient ultraviolet absorbent. The surface modified aramid fiber has anti-UV function, high surface activity, high thermal performance and higher mechanical properties, and excellent comprehensive performance and higher utilization value. The preparation method is simple and controllable, and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a surface modification technology of aramid fiber, in particular to a surface modified aramid fiber and a preparation method thereof. Background technique [0002] Aramid fiber is a typical representative of high-performance organic fibers. Its excellent comprehensive properties such as light weight, ultra-high strength, high modulus and high heat resistance make it widely used in aerospace, safety protection, electronic information, sporting goods, tire frames, etc. domain plays an important role. However, aramid fibers have disadvantages such as low surface activity and poor UV resistance. [0003] In recent years, in order to improve the surface activity and UV resistance of aramid fibers, UV shielding agents have been introduced on the surface of aramid fibers. UV screeners are divided into organic UV screeners and inorganic UV screeners. However, organic UV shielding agents have poor heat resistance and oxidation resist...

Claims

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Application Information

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IPC IPC(8): D06M11/38D06M13/513D06M11/80D06M11/45D06M15/61D06M101/36
CPCD06M11/38D06M11/45D06M11/80D06M13/513D06M15/61D06M2101/36D06M7/00D06M15/3562D06M23/08D06M10/001B82Y40/00D06M11/36
Inventor 顾嫒娟蔡华梁国正袁莉
Owner SUZHOU UNIV
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