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A method for modifying the surface of aramid fiber and its application in reinforcing natural rubber
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A surface modification, natural rubber technology, applied in fiber types, textiles and papermaking, fiber processing, etc., can solve the problems of affecting the performance of composites, damage to the aramid fiber body, poor effect, etc., to achieve suitable industrial production, improve interface adhesion The effect of combined force and simple process
Active Publication Date: 2016-04-27
广西平果润民发展有限公司
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Problems solved by technology
At present, the surface treatment of aramid fiber of aramid fiber / rubber composite material that has entered industrial application adopts the surface treatment method of coupling agent after acid or alkali corrosion of the fiber surface, or the surface treatment method of latex coating, because the surface of aramid fiber is too inert. High, not only the activation cost is high, but the effect is poor, the former method will also cause damage to the aramid fiber body and affect the performance of the composite; the latter method is based on physical interaction between the matrix and the fiber, and the cost is high
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Embodiment 1
[0015] Example 1 of the present invention: a method for modifying the surface of aramid fibers, cutting aramid filaments (brand: AF-1000, 1500D, Korea ALKEX Company) into 13mm segments, placing them in a beaker, ultrasonically cleaning them with acetone for 2 hours, and then drying them ; Each group takes 15g aramid fibers (4 groups in total), and uses 2% AlCl 3 Ultrasonic impregnation of the aqueous solution at room temperature for 30 minutes, pour off the solution, keep the surface of the fiber soaked, and obtain impregnated aramid fiber; add 1.5g, 4.5g, 7.5g and 10.5g of hydroxyl-terminated liquid to each beaker equipped with aramid fiber Polyisoprene rubber (brand: L2R-565, molecular weight about 50,000, viscosity: 500Pa·S, Puyang Linmin Chemical New Material Co., Ltd.), and pour 100ml of toluene into each group to completely immerse the mixed materials, After fully mixing, after ultrasonic impregnation for 30 minutes, dry the mixture at 145°C for 3 hours, dry the solvent,...
Embodiment 2
[0021] Example 2 of the present invention: a method for modifying the surface of aramid fibers, cutting aramid filaments (brand name: AF-1000, 1500D, Korea ALKEX Company) into 13mm segments, placing them in a beaker, ultrasonically cleaning them with acetone for 2 hours, and then drying them ; Each group takes 30g aramid fiber (totally 4 groups), and uses the AlCl that the mass percent concentration is 5% respectively 3 Ultrasonic impregnation of the aqueous solution at room temperature for 30 minutes, pour off the solution, keep the surface of the fiber soaked, and obtain impregnated aramid fiber; add 3g, 9g, 15g and 21g of hydroxyl-terminated liquid polyisoprene to each beaker equipped with aramid fiber Polyethylene rubber (brand: L2R-565, molecular weight about 50000, viscosity: 500Pa·S, Puyang Linmin Chemical New Material Co., Ltd.), and pour 100ml of toluene into each group, completely immerse the mixed materials, and mix well , after ultrasonic impregnation for 30min, th...
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Abstract
The invention discloses a method for modifying an aramid fiber surface and application of the method to enhancement of natural rubber. The method comprises the following steps: aluminum chloride is taken as a catalyst, and liquid polyisoprene rubber and aramid fiber are subjected to grafted reaction; a functional group on a hydroxyl-terminated liquid rubber molecule directly reacts with active H on a benzene ring in an aramid fiber molecule structure without reacting with an amide group by breaking through conjugate and stereo-hindrance effect, so that the hydroxyl-terminated liquid rubber molecule is grafted on the aramid fiber surface, so as to achieve modification on the aramid fiber surface by the hydroxyl-terminated liquid polyisoprene rubber. The hydroxyl-terminated liquid polyisoprene rubber and the natural rubber have the same molecule structures, so that the modified aramid fiber and the natural rubber can simultaneously participate in vulcanization crosslinking reaction in the vulcanization procedure after being evenly mixed, so as to achieve co-vulcanization. Thus, the interface bonding strength between the fiber and the matrix can be effectively improved, so as to improve the mechanical property of the composite material.
Description
technical field [0001] The invention relates to the field of polymer materials, in particular to a method for modifying the surface of aramid fibers and the application of the reinforced natural rubber. Background technique [0002] Aramid fiber has excellent properties such as high temperature resistance and high strength, and is widely used as a reinforcing material for rubber. Because the benzene ring in the aramid molecular chain forms a great steric hindrance effect on the amide groups on the left and right sides and the highly crystalline molecular chain structure, the surface activity of the aramid fiber is very low and very smooth, which greatly affects the quality of the aramid fiber. The interface with natural rubber is bonded, so the surface activation treatment of aramid fibers is the key technology for preparing aramid fiber reinforced rubber composites with excellent performance. At present, the surface treatment of aramid fiber of aramid fiber / rubber composit...
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