Chemical method for activating aramid fiber surface

A technology of aramid fiber and surface activation, which is applied in the chemical field of aramid fiber surface activation, can solve the unsolved essential factors of the interfacial bonding strength of composite materials, it is difficult to control the degree of corrosion and etching depth, and it cannot be obtained in large-scale industry. Application and other issues, to achieve good activation effect, no drop in impact strength, and low cost

Inactive Publication Date: 2010-08-11
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With its low density, high strength, high stiffness, high heat resistance and good chemical environment resistance, aramid fiber is used as an excellent reinforcing material, and is widely used in advanced high-tech fields such as aviation and aerospace. In the composite material technology, however, the highly oriented and crystalline structure formed in the liquid crystal spinning process causes the aramid fiber to exhibit a strong surface chemical inertness, which greatly reduces the interfacial bonding strength between it and the resin matrix, thereby affecting The comprehensive mechanical properties of composite materials have had a great negative impact. Therefore, the research on the surface activation of aramid fibers has always been a hot and difficult point in the field of advanced composite materials.
[0003] The existing surface activation methods of aramid fibers at home and abroad mainly include three methods: physics, chemistry and the comprehensive application of the two, but most of them are still used as experimental research and cannot be used in large-scale industrial applications. The reason is that physical methods mainly use Ultrasonic vibration causes cavitation of the liquid near the fiber surface, and the energy released by the cavitation can peel off the weak layer on the fiber surface and reduce the stress concentration point, but this method does not solve the essential factors that affect the interfacial bonding strength of composite materials , that is, chemically inert, so the activation effect is poor
The chemical method includes two ways: one is to use the corrosion effect of strong oxid

Method used

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  • Chemical method for activating aramid fiber surface

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Experimental program
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Effect test

Example Embodiment

[0025] Example one

[0026] A chemical method for surface activation of aramid fiber, the specific steps are as follows:

[0027] In the first step, aramid fiber, surfactant epichlorohydrin, and anhydrous aluminum trichloride are weighed in a ratio of 1:3:1.5, and dried separately.

[0028] In the second step, the dried aramid fiber and epichlorohydrin were added to the reactor with the reflux device in the ratio of 1:3.

[0029] In the third step, under the protection of nitrogen, the reactor was heated to 110°C for grafting reaction. During the reaction, the total amount of the anhydrous aluminum trichloride weighed and dried in the first step was added in 2 times. The amount added each time is the same. After the reaction is carried out for 20 minutes, the reactor is naturally cooled to room temperature, and the aramid fiber is taken out.

[0030] The fourth step is to soak the aramid fiber obtained in the third step with industrial pure acetone for 24 hours, and then use distilled ...

Example Embodiment

[0035] Example two

[0036] A chemical method for surface activation of aramid fiber, the specific steps are as follows:

[0037] In the first step, aramid fiber, surfactant epichlorohydrin, and anhydrous aluminum trichloride are weighed in a ratio of 1:3:2, and dried separately,

[0038] In the second step, the dried aramid fiber and epichlorohydrin were added to the reactor with the reflux device in the ratio of 1:3.

[0039] In the third step, under the protection of nitrogen, the reactor was heated to 112°C for grafting reaction. During the reaction, the total amount of the anhydrous aluminum trichloride weighed and dried in the first step was added in 2 times. The amount added each time is the same. After 40 minutes of reaction, the reactor is naturally cooled to room temperature, and the aramid fiber is taken out.

[0040] The fourth step is to soak the aramid fiber obtained in the third step with industrial pure acetone for 24 hours, and then use distilled water to rinse the dir...

Example Embodiment

[0045] Example three

[0046] A chemical method for surface activation of aramid fiber, the specific steps are as follows:

[0047] In the first step, the aramid fiber, the surfactant epichlorohydrin, and anhydrous aluminum trichloride are weighed in a ratio of 1:3:3, and dried separately.

[0048] In the second step, the dried aramid fiber and epichlorohydrin were added to the reactor with the reflux device in the ratio of 1:3.

[0049] In the third step, under the protection of nitrogen, the reactor was heated to 113°C to carry out the grafting reaction. During the reaction, the total amount of the anhydrous aluminum trichloride weighed and dried in the first step was added in 3 times. The amount added each time is the same. After the reaction is carried out for 60 minutes, the reactor is naturally cooled to room temperature, and the aramid fiber is taken out.

[0050] The fourth step is to soak the aramid fiber obtained in the third step with industrial pure acetone for 24 hours, an...

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Abstract

The invention relates to a chemical method for activating aramid fiber surface and the method adopts aramid fiber as activated object. The method comprises the following steps: using a large amount of benzene rings in the molecular chains of aramid fiber to perform Friedel-Crafts reaction with epichlorohydrin, grafting epichlorohydrin to aramid fiber surface to form o-chlorohydrin side chains, and then using alkaline solution to perform epoxidation and obtain active side chains. The specific steps are as follows: firstly drying aramid fiber, epichlorohydrin and anhydrous aluminium chloride, performing a grafting reaction, using acetone to soak, secondly performing epoxidation reaction, washing with distilled water, and finally drying aramid fiber to obtain aramid fiber with activated surface. The chemical method can increase the surface activity of aramid fiber under the premise of not damaging the entity structure, have the advantages that the cost is low, the process operability is strong, the surface activation effect is good, the activation does not have degradation effect and the social benefit is good, and be applicable to batch industrial production.

Description

Technical field [0001] The invention relates to the technical field of surface activation of aramid fibers, in particular to a chemical method for surface activation of aramid fibers. Background technique [0002] Aramid fiber is used as an excellent reinforcement material for its advantages of low density, high strength, high stiffness, high heat resistance and good chemical environment resistance, and is widely used in advanced high-tech fields such as aviation and aerospace. In composite material technology, the highly oriented and crystalline structure formed in the liquid crystal spinning process causes the aramid fiber to exhibit strong surface chemical inertness, which greatly reduces the interface bonding strength between it and the resin matrix, thereby preventing The comprehensive mechanical properties of composite materials have a great negative impact. Therefore, surface activation research on aramid fibers has always been a hot and difficult point in the field of adv...

Claims

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Application Information

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IPC IPC(8): D06M13/11D06M101/36
Inventor 郑元锁刘铁民胡洁
Owner XI AN JIAOTONG UNIV
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