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Making process of strong acid ion exchange fiber

A technology of ion exchange fiber and manufacturing method, which is applied in the field of chemical fiber material manufacturing and strong acid ion exchange fiber manufacturing, can solve the problems of low utilization rate of grafted monomers, easily damaged fiber matrix, and insufficient acid strength, and achieve industrialization The effect of easy promotion and implementation, short production process and simple process

Inactive Publication Date: 2005-04-27
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many shortcomings in this method and the strong acid fiber obtained, such as the polyethylene or polypropylene fiber as the fiber matrix has poor heat resistance and chemical stability. The matrix is ​​easily damaged, the chemical grafting method used has a low grafting rate, the acid strength is not high enough, and the utilization rate of grafted monomers is also low.
Therefore, studying a strong acid ion exchange fiber with simple manufacturing method, high acid strength and good stability is an important direction of fiber material research at present, and the literature on super acid ion exchange fiber has not been reported yet.

Method used

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  • Making process of strong acid ion exchange fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Immerse the polytetrafluoroethylene fibers in a homogeneously mixed solution of 70% styrene and 30% dichloromethane by volume, pass through nitrogen protection, and irradiate 30KGy with cobalt 60 at room temperature for 80 hours to obtain grafted fibers, take them out and wash them and then immersed in a homogeneously mixed solution of 30% by volume of chlorosulfonic acid and 70% of tetrachloroethane, carried out sulfonation reaction at 100°C, cooled and washed to obtain the strong acid ion exchange fiber. After testing, the fiber has an exchange capacity of 3.8mmol / g, can be used for ion exchange, has strong acidity (pH value is 2.92), and can also be used as a solid acid catalyst.

Embodiment 2

[0027] Immerse the polytetrafluoroethylene fibers in a homogeneously mixed solution of 40% styrene and 60% methylene chloride by volume, pass through nitrogen protection, and irradiate 30KGy with cobalt 60 at room temperature for 80 hours to obtain grafted fibers, take them out and wash them Then immerse it in a homogeneous mixed solution of 40% chlorosulfonic acid and 60% tetrachloroethane by volume, carry out sulfonation reaction at 90°C, wash after cooling, and obtain the strong acid ion exchange fiber. After testing, the fiber has an exchange capacity of 2.7mmol / g, can be used for ion exchange, has strong acidity (PH value is 3.85), and can also be used as a solid acid catalyst.

Embodiment 3

[0029] Soak the polytetrafluoroethylene fibers in a homogeneously mixed solution of 60% styrene and 40% dichloromethane by volume, pass through nitrogen protection, and irradiate 30KGy with cobalt 60 for 80 hours at room temperature to obtain grafted fibers, take them out and wash them Then immerse it in a homogeneous mixed solution of 40% chlorosulfonic acid and 60% tetrachloroethane by volume, carry out sulfonation reaction at 100°C, wash after cooling, and obtain the strong acid ion exchange fiber. After testing, the fiber has an exchange capacity of 3.5mmol / g, can be used for ion exchange, has strong acidity (PH value is 3.25), and can also be used as a solid acid catalyst.

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Abstract

The making process of strong acid ion exchange fiber includes the irradiation grafting step of setting PTFE fiber inside homogeneous mixed solution compounded with styrene in 10-70 vol% and dichloromethane in 30-90 vol%, introducing protecting nitrogen, and irradiating with Co-60 of dosage 15-30 KGy at room temperature for 24-80 hr, and washing to obtain grafted PTFE fiber; and the grafted PTFE fiber sulfonating step of setting the grafted PTFE fiber inside homogeneous mixed solution compounded with chlorosulfonic acid in 30-40 vol% and ethane tetrachloride in 60-70 vol% for sulfonation, cooling and washing to obtain the said strong acid ion exchange fiber. The production process of the present invention is simple and wide applicable and needs no special apparatus, and the product has high stability and strong acidity and may be used in ion exchange and solid acid catalysis.

Description

technical field [0001] The invention relates to a method for manufacturing chemical fiber materials, specifically a method for manufacturing strong acid ion exchange fibers, which belongs to the field of functional polymer materials, and the international patent main classification number is intended to be Int.C1 7 B01J39 / 20. Background technique [0002] Strong acid ion exchange fiber refers to a chemical fiber material with strong acidic groups. Strong acid ion exchange fibers can be used as ion exchangers because of their super acidic groups. Strongly acidic ion exchange fibers can be applied to various ion exchange processes, and have been widely used in water treatment, precious metal ion recovery, separation and extraction of pharmaceuticals, biochemistry and other fields. broad. [0003] The matrix of strong acid ion exchange fibers that have been prepared so far is mostly composed of hydrocarbons. The general manufacturing method is to use chemical methods to ini...

Claims

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Application Information

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IPC IPC(8): B01J39/20
Inventor 魏俊富张政朴李慧胡荣霞
Owner NANKAI UNIV
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