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Direct fluorination method for producing surface fluorine-containing fiber

A fluorine-containing fiber and fluorination technology, which is used in liquid/gas/vapor processing of textile materials of a certain length, processing textile material drums, processing textile material equipment configuration, etc., can solve problems such as flammability, and improve fluorination rate. , improve uniformity and efficiency, and accelerate the effect of diffusion rate

Active Publication Date: 2012-07-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the rolls used are generally paper rolls, which are flammable, and fluorine gas is a highly dangerous gas.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, wrap the aramid fibers on the polypropylene plastic cylinder with 2mm diameter uniformly distributed on the wall, and control the fiber weight of each cylinder at about 500 grams according to the routine, and then put several reels of fibers into two closed fluorination reaction In the reactor, turn on the heating circulation fan to raise the temperature to 50°C, start the vacuum auxiliary system at the same time to evacuate the two fluorination reactors to a pressure of <10KPa, close the relevant valves, and then fill the two fluorination reactors with fluorine gas at the same time / Nitrogen gas mixture to fluorinate the fibers placed inside it. The total pressure of the mixed gas in the two reactors is less than 50KPa, and the partial pressure of the fluorine gas is 15KPa. After 5 minutes of fluorination, the fluorine / nitrogen gas mixture in one of the fluorination reactors is pumped into the other fluorination reactor through a vacuum pump to continue fluorina...

Embodiment 2

[0023] In this embodiment, except that the fluorination temperature is controlled to be 25° C., the partial pressure of fluorine gas in the reactor is 10 KPa, and the number of cycles is 20 times, the rest of the fluorination process is the same as that of Embodiment 1, so it is omitted here.

Embodiment 3

[0025] In this embodiment, except that the reel is made of a metal cylinder, the fluorination temperature is controlled to be 100°C, the partial pressure of fluorine gas in the reactor is 5KPa, the fluorination time of each cycle is 1 minute, and the number of fluorination cycles is 10 times, the remaining fluorine The chemical process is omitted because it is the same as in Example 1.

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PUM

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Abstract

The invention discloses a direct fluorination method for producing surface fluorine-containing fiber, which is characterized by comprising the steps of: firstly winding raw material fiber on a winding drum with through holes uniformly distributed on the wall, putting in two fluorination reactors and heating and enabling fluorine gas mixture to carry out pulse circulation between the two fluorination reactors by utilizing a vacuum accessory system to ensure that the fluorine gas mixture repeatedly penetrates through fiber layers on the winding drum and is forcedly diffused to uniformly fluoridate the fiber wound on the drum. The method disclosed by the invention has the advantages that the batch surface treatment of whole-drum fiber can be realized; the inner / outer layer surface effect uniformity of the treated fiber is good; the fluorination rate is high; the treatment period is short; the consumed fluorine gas amount is little; the production cost is lower; the safety is high; the process is simple and controllable; and wider application prospect is provided.

Description

technical field [0001] The invention belongs to the technical field of fiber surface modification, and in particular relates to a method for producing surface fluorine-containing fibers by direct fluorination. Background technique [0002] As the main reinforcing medium of advanced composite materials, high-performance fibers have a very important surface activity. However, ordinary fibers do not have this surface activity, so they generally need surface activation modification treatment to improve the interface properties between them and the matrix resin, so as to improve the overall performance of the composite material. Due to the particularity of the fiber itself, such as small fineness and large specific surface area, it is generally wound into a tube during processing. Therefore, the large-scale production method of surface activation treatment of fibers has always been a hot spot in research and development. At present, the production methods of large-scale activat...

Claims

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Application Information

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IPC IPC(8): D06B5/16D06B23/02D06B23/20
Inventor 刘向阳王旭张鹏陈一罗龙波庞雨微高杰
Owner SICHUAN UNIV
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