Method for modifying aramid fibers by silane coupling agent

A technology of silane coupling agent and modified aramid fiber, which is applied in fiber treatment, textile and papermaking, physical treatment, etc. It can solve the problem of poor interfacial bonding performance of composite materials, low surface activity of aramid fiber, and "skin-core structure" and other problems to achieve the effect of improving the surface activity of fibers, avoiding the reduction of fiber strength and avoiding damage

Inactive Publication Date: 2016-11-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problems of low surface activity of aramid fiber, serious "skin-core structure" phenomenon and poor interfacial bonding performance of composite materials, the invention provides a method for modifying aramid fiber with a silane coupling agent

Method used

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  • Method for modifying aramid fibers by silane coupling agent
  • Method for modifying aramid fibers by silane coupling agent
  • Method for modifying aramid fibers by silane coupling agent

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specific Embodiment approach 1

[0039] Specific Embodiment 1: This embodiment provides a method for modifying aramid fiber with a silane coupling agent, including cleaning and drying the fiber surface, chlorination reaction on the fiber surface, hydroxylation reaction on the fiber surface and grafted silane coupling on the fiber surface Reagent reaction four steps, concrete implementation steps are as follows:

[0040] 1. Aramid fiber surface cleaning and drying:

[0041] (1) Put the aramid fiber bundle into the high-pressure reactor, seal it, and after vacuuming, inject acetone into it through the feed port to make the fiber submerged in the acetone, close the feed port, put the reactor into the oven, and control the temperature React at 60~80°C for 22~26 hours. After the reaction, take out the fiber and wash it with acetone for 5~10 minutes;

[0042] (2) Take out the aramid fibers treated in step (1) and dry them in an oven at 70-80°C for 2-4 hours;

[0043] 2. Chlorination reaction on fiber surface:

...

specific Embodiment approach 2

[0064] Specific embodiment two: This embodiment provides a method for modifying aramid fiber with a silane coupling agent, including fiber surface cleaning and drying, fiber surface chlorination reaction, fiber surface hydroxylation reaction and fiber surface graft silane coupling Reagent reaction four steps, concrete implementation steps are as follows:

[0065] 1. Aramid fiber surface cleaning and drying:

[0066] (1) Put the aramid fiber bundle into the high-pressure reactor, seal it, and after vacuuming, inject acetone into it through the feed port to make the fiber submerged in the acetone, close the feed port, put the reactor into the oven, and control the temperature React at 70°C for 24 hours. After the reaction, take out the fiber and wash it with acetone for 5 minutes;

[0067] (2) Take out the aramid fibers treated in step (1) and dry them in an oven at 75°C for 3 hours;

[0068] 2. Chlorination reaction on fiber surface:

[0069] (1) Put the dried aramid fiber i...

specific Embodiment approach 3

[0080] Specific Embodiment Three: This embodiment provides a method for modifying aramid fiber with a silane coupling agent, including cleaning and drying the fiber surface, chlorination reaction on the fiber surface, hydroxylation reaction on the fiber surface and grafted silane coupling on the fiber surface Reagent reaction four steps, concrete implementation steps are as follows:

[0081] 1. Aramid fiber surface cleaning and drying:

[0082] (1) Put the aramid fiber bundle into the high-pressure reactor, seal it, and after vacuuming, inject acetone into it through the feed port to make the fiber submerged in the acetone, close the feed port, put the reactor into the oven, and control the temperature React at 80°C for 24 hours. After the reaction, take out the fiber and rinse it with acetone for 10 minutes;

[0083] (2) Take out the aramid fibers treated in step (1) and dry them in an oven at 70°C for 4 hours;

[0084] 2. Chlorination reaction on fiber surface:

[0085] (...

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Abstract

A method for modifying aramid fiber with a silane coupling agent, the method comprises four steps of cleaning and drying the fiber surface, chlorination reaction on the fiber surface, hydroxylation reaction on the fiber surface and grafting silane coupling agent reaction on the fiber surface. The invention adopts gamma ray high-energy irradiation to treat aramid fibers, and uses 1,4-dichlorobutane as a grafting agent to irradiate aramid fibers and 1,4-dichlorobutane to initiate grafting on the fiber surface reaction, introduce -Cl functional group, and then use NaOH solution to carry out hydroxylation treatment, convert -Cl to -OH, introduce -OH on the surface of the fiber, and finally react the hydroxylated aramid fiber with the aminosilane coupling agent KH550 to activate Fiber surface, improve fiber interface performance. The process of the invention is simple and efficient, the fibers can be processed in batches, the reaction solvent can be reused many times, the invention is green and environmentally friendly, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a method for modifying aramid fiber, in particular to a method for modifying the surface of aramid fiber with a silane coupling agent. Background technique [0002] With the development of manned spaceflight, lunar exploration projects, commercial aircraft and modern high-tech weapons, the requirements for composite materials are further "miniaturized", "lightweight" and "high performance". Due to the advantages of high-performance fiber-reinforced resin composite materials such as high strength, high specific modulus, high temperature resistance, and corrosion resistance, they occupy an increasingly important position in many defense industries such as aerospace and weaponry. As a light-weight, high-strength advanced resin-based composite material, aramid fiber / epoxy composite material is widely used in various aircraft in aerospace and strategic intercontinental missiles in national defense and military industry due to its hi...

Claims

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Application Information

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IPC IPC(8): D06M13/513D06M10/08D06M11/38D06M13/127D06M101/36
CPCD06M13/513D06M10/08D06M11/38D06M13/127D06M2101/36
Inventor 刘丽谢非黄玉东邢丽欣王巍贾储源钟正祥赵敏王彩凤
Owner HARBIN INST OF TECH
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