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Preparation method of pre-swollen perfluorinated ion exchange membrane

A perfluorinated ion, pre-swelling technology, applied in the field of ion exchange membranes, can solve the problems of not being able to fully stretch out, partially showing shrinkage and curling, inhibiting the ability to absorb water and swelling, unable to meet application requirements, etc., to achieve cost savings, increase Effective volume, the effect of saving production costs

Active Publication Date: 2021-10-22
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be inferred from this that the perfluorinated ion exchange membrane itself has a strong ability to absorb water and expand after the pores are formed, but when the ambient humidity is low, the membrane absorbs water limited, and the internal pores cannot be completely stretched, and some of them are in a shrinking and curling state. ; When the membrane is again in an environment with sufficient water, such as soaking in an equilibrium solution, according to the principle of thermal expansion and contraction, if the temperature of the solution is low at this time, it is not enough to stimulate the pores in the membrane to fully expand, and the water absorption of the membrane Swellability will be inhibited, which will eventually result in a membrane with a smaller size than the application needs

Method used

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  • Preparation method of pre-swollen perfluorinated ion exchange membrane

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Experimental program
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Effect test

Embodiment 1

[0029] Customer 1 requires the size of the finished perfluorinated ion exchange membrane to be 1500mm.

[0030] The pre-swelling agent is pure water, the liquid level is 15.50cm, the temperature is raised to 60°C, and the temperature is kept constant for 30 minutes; the perfluorinated ion exchange membrane is preliminarily cut in the dry film state, the original size is measured, and then soaked in the pre-swelling agent. Take it out after 20 minutes, and then soak it in the NaOH equilibrium solution with a mass concentration of 2.2% at room temperature.

[0031] Table 1-1 Dimensional changes of membranes pre-swelled at 60°C for 20 minutes

[0032]

[0033] All five samples met the requirements, and the yield was 100.0%.

[0034] Determination of moisture content and electrochemical performance are shown in Table 1-2:

[0035] Table 1-2 Moisture content and electrochemical performance of the membrane pre-swelled at 60°C for 20 minutes

[0036]

[0037]

Embodiment 2

[0039] Customer 2 requires the size of the finished perfluorinated ion exchange membrane to be 1500mm.

[0040] The pre-swelling agent is pure water, the liquid level is 16.70cm, the temperature is raised to 60°C, and the temperature is kept constant for 30 minutes; the perfluorinated ion exchange membrane is preliminarily cut in the dry film state, the original size is measured, and then soaked in the pre-swelling agent. Take it out after 10 minutes, and then soak it in the NaOH equilibrium solution with a mass concentration of 1.8% at room temperature.

[0041] Table 2-1 Dimensional changes of membranes pre-swelled with pure water at 60°C for 10 minutes

[0042]

[0043] All five samples met the requirements, and the yield was 100.0%.

[0044] Determination of moisture content and electrochemical performance are shown in Table 2-2:

[0045] Table 2-2 Moisture content and electrochemical performance of the membrane pre-swelled at 60°C for 10 minutes

[0046]

Embodiment 3

[0048] Customer 3 requires the size of the finished perfluorinated ion exchange membrane to be 1500mm.

[0049] The pre-swelling agent is pure water, the liquid level is 16.50cm, the temperature is raised to 40°C, and the temperature is kept constant for 30 minutes; the perfluorinated ion exchange membrane is preliminarily cut in the dry film state, the original size is measured, and then soaked in the pre-swelling agent. Take it out after 10 minutes, and then soak it in the NaOH equilibrium solution with a mass concentration of 2.0% at room temperature.

[0050] Table 3-1 Dimensional changes of membranes pre-swelled with pure water at 40°C for 10 minutes

[0051]

[0052] All five samples met the requirements, and the yield was 100.0%.

[0053] Determination of moisture content and electrochemical performance are shown in Table 3-2:

[0054] Table 3-2 Moisture content and electrochemical performance of the membrane pre-swelled at 40°C for 10 minutes

[0055]

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Abstract

The invention relates to a preparation method of a pre-swelled perfluorinated ion-exchange membrane, belonging to the technical field of ion-exchange membranes. The preparation method of the pre-swelled perfluorinated ion-exchange membrane of the present invention is to perform pre-swelling treatment on the perfluorinated ion-exchange membrane, and then perform equilibrium treatment to obtain the pre-swollen perfluorinated ion-exchange membrane. The preparation method of the pre-swelled perfluorinated ion-exchange membrane described in the present invention is scientific and reasonable in design, simple and easy to implement, and the prepared pre-swelled perfluorinated ion-exchange membrane not only has a larger size swelling rate, but also has a higher electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a pre-swelled perfluorinated ion-exchange membrane, belonging to the technical field of ion-exchange membranes. Background technique [0002] The application of perfluorinated ion exchange membranes in the salt electrolysis industry has set off a revolution in the chlor-alkali industry. As the core component of the chlor-alkali electrolyzer, the perfluorinated ion exchange membrane plays a key role. It selectively permeates the cations in the electrolyzer, and at the same time generates high-purity H at the cathode and anode. 2 and Cl 2 . [0003] The preparation and processing of perfluorinated ion exchange membranes are very complicated, involving many fields and various physical and chemical changes. Among them, the most critical thing for the electrochemical performance of the membrane is the formation of pores inside the membrane. This process occurs in the chemical change of the resin functional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B13/08C25B13/02C25B1/46
CPCC25B1/46C25B13/02C25B13/08
Inventor 李晓杨淼坤王超之孙芙蓉张江山王丽张永明
Owner SHANDONG DONGYUE POLYMER MATERIAL
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