A kind of aramid fiber surface graft treatment method
A kind of aramid fiber and processing method technology, applied in the direction of fiber processing, fiber type, textile and papermaking, etc., can solve the problems of chemical grafting reaction process and reaction degree that are not easy to control, difficult to industrialize, harsh reaction conditions, etc. Continuous processing, simple equipment, and the effect of improving surface roughness
Inactive Publication Date: 2020-12-25
GUIZHOU INST OF TECH
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Problems solved by technology
[0006] The purpose of the present invention is to provide a method for grafting the surface of aramid fiber to solve the problem that the reaction process and reaction degree of the existing chemical grafting modification are difficult to control, and the process is complicated, there are many processing steps, the reaction conditions are harsh, and the investment cost is low. Big and difficult to industrialize
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[0021] refer to Figure 1 to Figure 5 , the present embodiment provides a kind of aramid fiber surface graft treatment method, and concrete steps are as follows:
[0022] (1) First immerse the aramid fiber in acetone and ultrasonically clean it at room temperature for 1-2 hours, and then place it in deionized water for multiple washings to remove the surface treatment agent during fiber processing. Dry at -80°C for 1-2 hours;
[0023] (2) Surface activation treatment of aramid fiber: 1) preparing a polyamic acid solution (PAA) with a mass fraction of 1%-10%; 2) cutting the pretreated aramid fiber into small sections of 10-50 cm, and placing In the amic acid solution, ultrasonically treat at 50°C for 0.5-2h; ③Take out the aramid fiber and place it in an electric heating constant temperature blast drying box, and treat it at 50°C for 2h to remove excess polyamic acid on the surface, and then put it in oxygen Or high temperature treatment at 250°C for 1 hour under air condition...
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Abstract
The invention provides a surface grafting treatment method for aramid fibers. The surface grafting treatment method for the aramid fibers comprises the following steps: (1) preparing a polyamic acid solution (PAA) of which the mass fraction is 1% to 10%; (2) cutting pretreated aramid fibers into small sections which are 10 to 50cm, placing in PAA, performing ultrasonic treatment for 0.5 to 2h at the temperature of 50 DEG C; (3) removing excessive polyamic acid on surfaces, and then performing high-temperature treatment for 1h at the temperature of 250 DEG C under oxygen or air conditions; (4)quickly washing with DMAC or NMP for multiple times after treatment, then washing with deionized water for multiple times until pH is 7; (5) drying after washing to obtain surface graft modified aramid fibers. The surface grafting treatment method for the aramid fibers disclosed by the invention solves the problems of difficult control of the reaction process and the reaction degree of the existing chemical graft modification, complicated process, more treatment steps, strict reaction conditions, large investment cost, difficult industrialization and the like. The invention belongs to the technical field of the aramid fiber treatment.
Description
technical field [0001] The invention relates to a method for grafting treatment on the surface of aramid fiber, which belongs to the technical field of fiber modification treatment. Background technique [0002] Short fiber reinforced composite materials can combine the rigidity of the matrix material and the fiber well. In particular, among many fibers, aramid fiber (AF) is characterized by its excellent strength, toughness, aspect ratio and high retention. The rate has the best modification effect on composite materials. However, AF has the disadvantages of high surface crystallinity, dense lattice, and poor chemical activity. This results in weaker interfacial adhesion between the fibers and the matrix. Therefore, seeking new and efficient surface treatment agents and effective interface modification technologies to improve interfacial bonding performance is one of the important directions in the current research on aramid fiber modification. [0003] In recent years, ...
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IPC IPC(8): D06M15/59D06M101/36
CPCD06M15/59D06M2101/36
Inventor 李杨罗咏梅周琴马智慧李青罗雄礼
Owner GUIZHOU INST OF TECH