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.
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[0049] Example 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 Company in the United States) were immersed in acetone at 70°C, petroleum ether at 75°C and deionized water at 115°C for 3 hours respectively; then the fibers were taken out and dried in a vacuum oven at 80°C to obtain clean aramid fibers. KF;
[0052] (2) Dissolve 10.5g of sodium hydroxide in 120mL of ethanol to prepare sodium hydroxide ethanol solution A; immerse the clean aramid fiber KF obtained in step (1) in the above solution A, and shake at 65°C After reacting for 5 hours, after the reaction is completed, washing and drying are performed to obtain aramid fiber with amino and carboxyl groups on the surface;
[0053] (3) Add 0.25g of aramid fiber with amino and carboxyl groups on the surface and 30mL γ-glycidoxypropyltrimethoxysilane into 70mL ethanol, and react at 70℃ for 12h under nitrogen atmosphere; after...
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[0064] Example 2
[0065] 1. Preparation of surface modified aramid fiber
[0066] Disperse 0.5 g of the silicon methoxy aramid fiber prepared in step (6) of Example 1 and 3.75 g of polydopamine-modified random-layer 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. The surface-modified aramid fiber is denoted as T-KF2. For its infrared spectrogram, scanning electron microscope (SEM) photograph, tensile properties and work of fracture, see the attached Figure 5 , 6 And 7, the surface contact angle and free energy are shown in Table 1.
[0067] 2. Ultraviolet radiation of clean fiber and modified fiber
[0068] According to the same steps and conditions of Example 1, the aramid fiber T-KF2 obtained in Example 2 was subjected to 168h UV irradiation to obtain a 168h ultraviolet irradiated fiber, which was recorded as UV-T-KF2. Its tensile properties and See attached Fi...
Example Embodiment
[0076] Example 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 Company in the United States) were immersed in acetone at 70°C, petroleum ether at 75°C and deionized water at 115°C 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 sodium hydroxide ethanol solution A; immerse the clean aramid fiber KF obtained in step (1) in the above solution A, and shake at 65°C After reacting for 5 hours, after the reaction is completed, washing and drying are performed to obtain aramid fiber with amino and carboxyl groups on the surface.
[0080] (3) Add 0.25g of aramid fiber with amino and carboxyl groups on the surface and 30mL γ-glycidoxypropyltrimethoxysilane into 70mL ethanol, and react at 70℃ for 12h under nitrogen atmosphere; a...
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