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Surface-modified aramid fiber and preparation method thereof

An aramid fiber and surface modification technology, applied in the field of organic fibers and their preparation, can solve the problems of large surface inertness and poor UV resistance, and achieve the effects of improving UV resistance, low cost, and improving flame retardant properties

Active Publication Date: 2015-03-11
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at solving the problems of poor UV resistance and high surface inertia of ordinary aramid fibers and the deficiencies in improving the flame retardancy of aramid fibers in the prior art, and provides a high surface activity and excellent UV resistance. Novel aramid fiber with high performance and flame retardancy and preparation method thereof

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0027] 1. Preparation of surface modified aramid fiber

[0028] (1) 0.5g para-aramid fiber (Kevlar-49, diameter 12um, density 1.43g / cm 3 , produced by DuPont Company of the United States) were immersed in acetone, petroleum ether, and deionized water in turn, and each was refluxed for 3 hours; after cleaning, the fibers were taken out and dried at 80°C for 12 hours to obtain clean aramid fibers, which were denoted as KF . Its infrared spectrum is attached figure 1 , surface contact angle and free energy are shown in Table 1.

[0029] (2) Stir and dissolve 10.5g of sodium hydroxide in 120mL of ethanol to obtain an ethanol solution of sodium hydroxide; immerse 0.1g of the KF fiber obtained in step (1) into the ethanol solution of sodium hydroxide, and reflux for 5 hours; After the reaction is finished, the fibers are washed with water and dried to obtain fibers with amino groups on the surface.

[0030] (3) Under the protection of nitrogen atmosphere, take 0.1g of aramid ...

Embodiment 2

[0041] 1. Preparation of surface modified aramid fiber

[0042] (1) Stir and dissolve 10.5g of sodium hydroxide in 120mL of ethanol to obtain an ethanol solution of sodium hydroxide; immerse 0.1g of the clean fiber KF obtained in step (1) of Example 1 into the ethanol solution of sodium hydroxide, Reflux for 5 hours; after the reaction, wash with water and dry to obtain fibers with amino groups on the surface.

[0043] (2) Under the protection of a nitrogen atmosphere, take 0.1g of the aramid fiber with amino groups obtained in step (2), add 30mL of γ-glycidyl etheroxypropyl trimethoxysilane, and 150mL of absolute ethanol solvent into a 250mL three-necked flask, and place at 70°C Under reflux for 12 hours, aramid fibers with methoxy groups on the surface were obtained.

[0044] (3) Dissolve 14.9g of cerium chloride and 1.11g of calcium chloride in 150mL of deionized water to obtain a mixed solution of cerium chloride and calcium chloride; add 6g of sodium hydroxide to the mix...

Embodiment 3

[0051] 1. Preparation of surface modified aramid fiber

[0052] (1) Stir and dissolve 10.5g of sodium hydroxide in 120mL of ethanol to obtain an ethanol solution of sodium hydroxide; immerse 0.1g of the clean fiber KF obtained in step (1) of Example 1 into the ethanol solution of sodium hydroxide, Reflux for 5 hours; after the reaction, wash with water and dry to obtain fibers with amino groups on the surface.

[0053] (2) Under the protection of a nitrogen atmosphere, take 0.1g of the aramid fiber with amino groups obtained in step (2), add 30mL of γ-glycidyl etheroxypropyl trimethoxysilane, and 150mL of absolute ethanol solvent into a 250mL three-necked flask, and place at 70°C Under reflux for 12 hours, aramid fibers with methoxy groups on the surface were obtained.

[0054] (3) Dissolve 14.9g of cerium chloride and 1.11g of calcium chloride in 150mL of deionized water to obtain a mixed solution of cerium chloride and calcium chloride; add 6g of sodium hydroxide to the mixed...

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Abstract

The invention discloses a surface-modified aramid fiber and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out amino and carboxyl treatment on the surface of an aramid fiber, then reacting with gamma-glycidoxypropyl trimethoxysilane and obtaining a methoxy fiber; reacting hydroxylated calcium oxide-doped cerium oxide with the methoxy fiber, and obtaining a hydroxylated calcium oxide-doped cerium oxide-coated fiber; putting the aramid fiber of which the surface is coated with the hydroxylated calcium oxide-doped cerium oxide into an alkoxy silane solution, adding deionized water and an organic solvent, washing and drying after the completion of reaction and obtaining the aramid fiber of which the surface is coated with hyper-branched polymer grafting inorganic nano-particles. The hyper-branched polymer grafting inorganic nano-particles disclosed by the invention can endow the aramid fiber with better flame resistance and ultraviolet resistance, and the surface adhesion and the mechanical property of the aramid fiber can be simultaneously improved. The surface-modified aramid fiber also has the characteristics of mild reaction conditions, less damage to the fiber and simple process.

Description

technical field [0001] The invention relates to an organic fiber and a preparation method thereof, in particular to a surface-modified aramid fiber and a preparation method thereof. technical background [0002] Aramid fiber is a shining pearl in today's advanced materials, and its excellent comprehensive performance has attracted a lot of attention since its birth. An important field of its application is the preparation of advanced resin matrix composites. However, the surface inertia and poor UV resistance make it difficult to fully reflect the excellent comprehensive properties of aramid fiber in composite materials; on the other hand, flame retardancy has gradually become one of the performance indicators of high-performance fiber materials, and further improvement of aramid fiber Expanding its application in harsher working environments is still a research topic that needs attention; however, there are few reports on related research and development work so far. Ther...

Claims

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Application Information

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IPC IPC(8): D06M15/643D06M11/44D06M11/45D06M101/36
Inventor 梁国正朱小玲顾嫒娟袁莉
Owner SUZHOU UNIV
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