Unlock instant, AI-driven research and patent intelligence for your innovation.

Polyimide fiber with high acid resistance and preparation method thereof

A polyimide fiber and fiber technology, which is applied in the field of high acid-resistant polyimide fiber and its preparation, can solve the problems that the surface layer of fluorine-containing polymers is easy to fall off, etc., shorten the processing cycle, reduce production costs, and use Effect of life improvement

Inactive Publication Date: 2012-07-25
SINOSELEN HI TECH +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its purpose is to form a chemical covalent bond between the coated fluoropolymer and the surface of the fiber, so as to overcome the disadvantage that the surface layer of the fluoropolymer is easy to fall off caused by the traditional coating method
However, there is no literature report on improving the acid resistance of polyimide fibers by fluorination

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polyimide fiber with high acid resistance and preparation method thereof
  • Polyimide fiber with high acid resistance and preparation method thereof
  • Polyimide fiber with high acid resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First place the polyimide fiber in a closed vacuum reactor, then evacuate, and replace the air in the reactor with nitrogen three times, then fill the vacuum reactor with a mixture of fluorine / nitrogen, wherein the fluorine is in The partial pressure in the reactor was 10KPa, and the temperature was raised to 25° C. to perform surface fluorination treatment for 20 minutes. Then use nitrogen to replace the reaction gas in the kettle for many times to obtain fluorinated high acid-resistant polyimide fiber.

[0025] The tensile strength retention rate of this fluorinated fiber was 95%.

Embodiment 2

[0027] In this example, except that the partial pressure of fluorine gas in the vacuum reactor is 50KPa, and the temperature is raised to 50° C. for 1 minute, the rest of the process is the same as that of Example 1, so it is omitted here.

[0028] The tensile strength retention rate of this fluorinated fiber was 95%.

Embodiment 3

[0030] In this embodiment, except that the partial pressure of fluorine gas in the vacuum reactor is 100KPa, and the temperature is raised to 5°C for fluorination for 5 minutes, the rest of the process is the same as that of Example 1, so it is omitted here.

[0031] The tensile strength retention rate of this fluorinated fiber was 97%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a polyimide fiber with high acid resistance prepared by using the technology direct fluorination. The surface of the fiber contains a carbon-fluorine covalent bond structure; characteristic absorption peaks of polyimide appear near 1780 cm<-1>, 1720 cm<-1> and 1380 cm<-1> in the transmission infrared spectrogram of the fiber, while absorption peaks of the carbon-fluorine covalent bond appear in the range of 1100 to 1300 cm<-1> in attenuated total reflection infrared spectrogram; power spectrum peaks of the element fluorine appear near 688 eV binding energy in X-ray photoelectron spectrogram of the fiber; the retention rate of tensile strength of the fiber is 94 to 98% after the fiber has undergone soaking treatment for 240 hours in an aqueous solution of sulfuric acid with a concentration of 20 wt%. The invention also discloses a preparation method for the polyimide fiber with high acid resistance. The polyimide fiber disclosed in the invention has obviously enhanced acid resistance, maintains excellent high temperature resistance and mechanical properties, and can be used as a high-end filtering material. The preparation method disclosed in the invention has the advantages of a high fluorination rate, a short preparation time and capacity of realizing continuous and on-line surface treatment of the fiber.

Description

technical field [0001] The invention belongs to the technical field of polyimide fiber and its preparation, and in particular relates to a highly acid-resistant polyimide fiber and a preparation method thereof. Background technique [0002] At present, environmental problems have become one of the major problems faced by human beings, among which water pollution, air pollution, white garbage, noise pollution, etc. are increasingly threatening our living environment. And one of several important sources of air pollution is a large amount of smoke and dust produced in various places. [0003] Since the beginning of the 21st century, people have paid more and more attention to the research on the systems used in factories and waste incineration sites that can filter a large amount of smoke generated by them. Although fibers are more and more widely used in air filters due to their unique advantages, because the fibers used as exhaust gas filtration systems of factories such as...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/09D06M101/30
Inventor 刘向阳侯庆华王旭罗龙波连宏光陈一
Owner SINOSELEN HI TECH