Chemical modification method for surface of aramid fiber and application of same in preparation of silver-coated aramid composite fiber

A technology of aramid fiber and surface chemistry, which is applied in fiber processing, textiles and papermaking, etc., can solve the problems of weak bonding force between shell and core fiber, low surface reactivity of aramid fiber, and low electrical performance, so as to achieve convenient large-scale Large-scale application, uniform silver shell layer, and excellent electrical properties

Inactive Publication Date: 2016-08-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for modifying the surface of aramid fibers with thiol modification and its application in the preparation of silver-coated aramid composite fibers for the low reactivity of the surface of aramid fibers, so as to solve the problem of preparing Metal-coated aramid composite fibers have problems such as low electrical properties, thick shell, weak bonding between shell and core fibers, high density, and high cost.

Method used

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  • Chemical modification method for surface of aramid fiber and application of same in preparation of silver-coated aramid composite fiber
  • Chemical modification method for surface of aramid fiber and application of same in preparation of silver-coated aramid composite fiber
  • Chemical modification method for surface of aramid fiber and application of same in preparation of silver-coated aramid composite fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Cleaning steps: Use a Soxhlet extractor to effectively remove the oil on the surface of the aramid fiber. Pour 170mL of ethanol into a round bottom flask of a Soxhlet extractor, then wrap 3g of aramid fiber with filter paper and place it in the Soxhlet extractor, and reflux for 4h. Afterwards, it was washed with ethanol for 3 times, filtered with suction, and dried in a vacuum oven at 110°C for 6 hours before use.

[0036] Aramid fiber surface chemical modification steps: Weigh 3g of aramid fiber into a three-necked flask, then add 30mL of water and 60mL of ethanol in turn, stir magnetically, and add γ-mercapto-propyltrimethoxysilane when the temperature is stable at 20°C and ammonia water, the concentration of which in the obtained chemical modification solution is 6mL / L, 50mL / L respectively, and react at this temperature for 5h, filter with suction, wash with absolute ethanol, repeat 3 times, and dry in an oven at 60°C for 6h ,stand-by.

[0037] Liquid-phase chemica...

Embodiment 2

[0046] Cleaning steps: Use a Soxhlet extractor to effectively remove the oil on the surface of the aramid fiber. Pour 200mL of acetone into a round-bottom flask of a Soxhlet extractor, then wrap 4g of aramid fiber with filter paper and place it in the Soxhlet extractor, and reflux for 4h. Afterwards, it was washed with ethanol for 3 times, filtered with suction, and dried in a vacuum oven at 110°C for 6 hours before use.

[0047] Mercapto modification: Weigh 3g of aramid fibers and place them in a three-necked flask, then add 30mL of water and 60mL of ethanol in turn, stir magnetically, and add γ-mercapto-propyltrimethoxysilane and ammonia water respectively when the temperature rises to 60°C , ensure that the concentrations are 5mL / L and 200mL / L respectively, react at this temperature for 5h, filter with suction, wash with absolute ethanol, repeat 3 times, dry in an oven at 60°C for 6h, and set aside.

[0048] Such as Figure 9 As shown, it can be seen that the surface morp...

Embodiment 3

[0050] Cleaning steps: Use a Soxhlet extractor to effectively remove the oil on the surface of the aramid fiber. Pour 170mL of toluene into a Soxhlet extractor round bottom flask, then wrap 5g of aramid fiber with filter paper and put it in the Soxhlet extractor, and reflux for 4h. Afterwards, it was washed with ethanol for 3 times, filtered with suction, and dried in a vacuum oven at 110°C for 6 hours before use.

[0051] Mercapto modification: Weigh 1g of aramid fiber and place it in a three-necked flask, then add 50mL of water and 50mL of ethanol in turn, stir magnetically, and add γ-mercapto-propyltriethoxysilane and ammonia respectively when the temperature is stable at 20°C , to ensure that the concentrations are 1mL / L and 10mL / L respectively, and react at this temperature for 8h, filter with suction, wash with absolute ethanol, repeat 3 times, dry in an oven at 60°C for 6h, and set aside.

[0052] Such as Figure 10 As shown, it can be seen that the surface morphology...

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Abstract

The invention relates to a chemical modification method for the surface of aramid fiber and application of the same in preparation of silver-coated aramid composite fiber. The chemical modification method comprises the following steps: 1) cleaning the surface of the aramid fiber and then carrying out pumping-filtration and drying; 2) placing the aramid fiber treated in the step 1) into a mixed solution of water and ethanol and adding a gamma-mercaptopropyltrimethoxysilane or gamma-mercaptopropyltriethoxysilane coupling agent and a catalyst so as to obtain a chemical modification solution; and 3) controlling reaction temperature and time for thiolation modification, and then successively carrying out pumping-filtering, washing and drying. Compared with the prior art, the invention has the following main advantages: the silver-coated aramid composite fiber prepared through the modification method has a uniform and compact silver shell, and the silver shell has low silver content, about 37.5 wt%; the silver-coated aramid composite fiber has excellent electrical performance and volume resistivity of 1.6*10<-4> omega.cm; bonding force between the aramid fiber and the silver shell is strong; and the method is simple in process, low in cost, environmentally friendly and easy for large-scale application.

Description

technical field [0001] The invention relates to the fields of conductive and electromagnetic shielding composite materials, flexible conductors, etc., in particular to a method for chemically modifying the surface of aramid fibers and its application in preparing silver-coated aramid composite fibers. Background technique [0002] Compared with isotropic conductive fillers, metal fibers with one-dimensional structure are easier to overlap to form a conductive network in the polymer matrix, and their percolation threshold is also smaller. At the same time, this conductive network is not easy to be damaged under external stress, so metal fibers can be used to prepare flexible conductors, and are used in flexible sensors, electronic skin and transparent electrodes and other fields. Although silver fibers have high electrical conductivity, they have a high density (about 10.5g / cm 3 ), poor compatibility with the polymer matrix, and high cost, which limit its application in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/83D06M13/513D06M101/36
CPCD06M11/83D06M13/513D06M2101/36
Inventor 赵素玲王雅兰王一龙李维陈志宏官建国
Owner WUHAN UNIV OF TECH
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