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A kind of acid-resistant ion exchange membrane and preparation method thereof

An ion-exchange membrane and cation-exchange technology, applied in the field of acid-resistant ion-exchange membranes and their preparation, can solve the problems of decreased water resistivity, decreased capacity, and affected membrane ion-exchange performance, etc., and achieve good tensile yield strength, The effect of improving the service life

Active Publication Date: 2021-10-08
辅元(天津)环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Generally speaking, after the water to be purified is filtered through the first stage and the second stage, divalent ions such as calcium ions and magnesium ions in the water can be removed, and the hardness of the water can be reduced to below 1ppm; When the reverse osmosis membrane ruptures, it will reduce its ability to remove divalent ions in the water, so that the hardness of the water is higher than 1ppm; at this time, after this high hardness water enters the electrodeionization membrane stack, it passes through the ion exchange membrane After the filtration, although the divalent ions and monovalent ions in the water can be filtered out, as time goes by, scale will be generated inside the membrane stack due to the action of calcium ions and magnesium ions. In order to improve the working efficiency of the membrane stack , it is necessary to use hydrochloric acid to clean the fouling inside the membrane stack; since the raw materials of traditional ion exchange membranes are added with antioxidants and coupling agents containing metal ions, although the addition of antioxidants and coupling agents can Improve the thermal oxygen resistance of the ion exchange membrane during high temperature processing and improve the compatibility between the ion resin and polyethylene resin, but these components containing metal ions will react with hydrochloric acid during the pickling process, making ion exchange The membrane is corroded and micropores appear inside, which leads to the decrease of the strength of the ion exchange membrane, the increase of the water permeability and the decrease of the resistivity of the produced water, which greatly affects the performance and service life of the ion exchange membrane.
However, if the antioxidant and coupling agent that do not contain metal ions are replaced, the polarity of the ion exchange resin will be affected by some active groups in the antioxidant and coupling agent, which will affect the ion exchange rate of the membrane. Exchange performance, making the exchange capacity lower than the industry standard value of 2.0mol / kg

Method used

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  • A kind of acid-resistant ion exchange membrane and preparation method thereof
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  • A kind of acid-resistant ion exchange membrane and preparation method thereof

Examples

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preparation example 1

[0040] Preparation Example 1 of Modified Linear Low Density Polyethylene: 1. Get 15kg of nano silicon dioxide, 3kg of sepiolite powder and 1kg of microcrystalline cellulose, mix them to obtain a blend; place the blend in 20wt% hydrochloric acid Soak in the solution for 3 hours, then suction filter it, wash with distilled water until neutral, and obtain the acid-treated blend;

[0041] ②Take 0.5kg of silane coupling agent KH550 and 100kg of ethanol solution with a volume fraction of 75%, and disperse for 20 minutes under the condition of ultrasonic frequency of 80kHz to obtain a silane hydrolyzate;

[0042] ③ Add the acid-treated blend to the silane hydrolyzate, stir at 90°C for 2 hours, filter with suction, wash with distilled water until neutral, and dry to obtain the modified blend;

[0043] ④ Add 10% of its weight modified blend to the linear low density polyethylene, mix at a high speed of 3000r / min for 20min, then place it in a twin-screw extruder, each zone of the screw ...

preparation example 2

[0044] Preparation example 2 of modified linear low density polyethylene: 1. Get 17.5kg of nano silicon dioxide, 5kg of sepiolite powder and 1kg of microcrystalline cellulose, mix them to obtain a blend; place the blend in 20wt% Soak in hydrochloric acid solution for 4 hours, then suction filter it, wash with distilled water until neutral, and obtain the acid-treated blend;

[0045] ②Take 0.5 kg of silane coupling agent KH560 and 110 kg of ethanol solution with a volume fraction of 85%, and disperse for 25 minutes at an ultrasonic frequency of 90 kHz to obtain a silane hydrolyzate;

[0046] ③ Add the acid-treated blend to the silane hydrolyzate, stir for 2.5 hours at a temperature of 95°C, filter with suction, wash with distilled water until neutral, and dry to obtain the modified blend;

[0047] ④ Add 15% of its weight modified blend to the linear low density polyethylene, mix it at a high speed of 3000r / min for 20min, then place it in a twin-screw extruder, each zone of the ...

preparation example 3

[0048] Preparation example 3 of modified linear low-density polyethylene: ① Take 20kg of nano silicon dioxide, 7kg of sepiolite powder and 1kg of microcrystalline cellulose, mix them to obtain a blend; place the blend in 20wt% hydrochloric acid Soak in the solution for 5h, then suction filter it, wash with distilled water until neutral, and obtain the acid-treated blend;

[0049] ②Take 0.5kg of silane coupling agent KH570 and 120kg of ethanol solution with a volume fraction of 95%, and disperse for 30min at an ultrasonic frequency of 100kHz to obtain a silane hydrolyzate;

[0050] ③The acid-treated blend was added to the silane hydrolyzate, stirred at 100°C for 3 hours, filtered with suction, washed with distilled water until neutral, and dried at 90°C for 10 hours to obtain the modified co- mixture;

[0051] ④ Add 20% of the weight of the modified blend to the linear low density polyethylene, mix it at a high speed of 3000r / min for 20min, then place it in a twin-screw extrud...

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Abstract

The invention relates to the field of diaphragm materials, in particular to an acid-resistant ion-exchange membrane and a preparation method thereof, which solves the problem of poor acid-corrosion resistance of the traditional ion-exchange membrane. Wherein, an acid-resistant ion-exchange membrane includes the following components in parts by weight: 5000-6000 parts of ion-exchange resin powder, 3000-4000 parts of modified linear low-density polyethylene and 50-80 parts of polyethylene wax; The modified linear low density polyethylene is formed by modifying the linear low density polyethylene by nano silicon dioxide, sepiolite powder, microcrystalline cellulose and silane coupling agent; the melt index of the linear low density polyethylene is 2.0g / 10min, the density is 0.9225g / cm 3 . The acid-resistant ion exchange membrane provided by the invention has the effects of good acid corrosion resistance, good ion exchange performance and long service life.

Description

technical field [0001] The invention relates to the technical field of diaphragm materials, more specifically, it relates to an acid-resistant ion exchange membrane and a preparation method thereof. Background technique [0002] Ion exchange membrane is a kind of polymer membrane containing ionic groups and has the ability to selectively permeate ions in the solution. It is mainly used for desalination of brackish water, desalination and concentration of solutions, and softening and desalination of boiler water. Among them, electrodeionization (abbreviated as EDI) is one of the innovative technologies in the field of water treatment in recent years. It is a water treatment technology that combines electroosmosis and ion exchange; usually, the water purification process It mainly includes three filtrations: ①First-level filtration, through the first-level filtration membrane to remove insoluble sediment and other substances in the water; ②Secondary filtration, through the rev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/26B01D69/02B01D67/00B01D61/48C02F1/469
CPCB01D61/48B01D67/0079B01D69/02B01D71/26B01D2325/42C02F1/4695
Inventor 吕大为
Owner 辅元(天津)环境技术有限公司