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Manufacture method of semihomogeneous anion-exchange membrane

An anion-exchange membrane and manufacturing method technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of difficulty in stabilizing the performance of ion-exchange membranes, hard texture of ion-exchange membrane products, and poor thermal stability, etc. Achieve the effect of improving cost performance and technical competitiveness, better thermal stability, and reducing film surface resistance

Active Publication Date: 2017-03-22
HANGZHOU IONTECH ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, on the one hand, polyvinyl chloride is prone to degradation during thermal processing, and its thermal stability is far inferior to that of polyethylene and non-thermoplastic crosslinkable ion exchange resin powder, so the performance of the obtained ion exchange membrane is difficult to stabilize.
On the other hand, polyvinyl chloride-based ionic membrane products are hard and easily damaged during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw material preparation:

[0025] 1) Preparation of thermoplastic polyethylene-quaternized polystyrene-based anion-exchange composite resin powder: Weigh 300 kg of low-density polyethylene powder (LDPE, Yanshan Petrochemical, brand: 1I20A, melt index: 20g / 10min, pulverize to 20-50 mesh), put it into a 2000-liter polymerization reactor, then add 1000 liters of tap water and 2.0 kg of polyvinyl alcohol, and stir to raise the temperature to 60-65°C. Add a polymerized oil phase consisting of 182 kg of styrene, 18 kg of divinylbenzene (mass purity 80%) and 2.0 kg of benzoyl peroxide, heat up and polymerize after absorbing for 1 hour, polymerize at 75°C for 2 hours, and polymerize at 90°C overnight , Washed with water, filtered and dried to obtain about 500 kg of white powder. Weigh 120 kg of the above-mentioned white powder, put it into a 1000 liter amination reaction kettle, add 500 liters of industrial chloromethyl ether and 40 kg of anhydrous zinc chloride, react at roo...

Embodiment 2

[0031] Raw material preparation: replace the LLDPE granules in Example 1 (Mitsui Chemicals, brand: 20100J, melt index: 8.0g / 10min) with LDPE granules (Yanshan Petrochemical, brand: 1I20A, melt index: 20g / 10min), and the remaining raw materials and preparation procedures were carried out as described in Example 1.

[0032] Semi-homogeneous membrane manufacturing: Weigh 20 kg non-thermoplastic cross-linked quaternary polystyrene anion exchange resin powder, 12 kg thermoplastic polyethylene-quaternary polystyrene anion exchange composite resin powder, 10 kg Polyethylene powder (LDPE, brand: 1I20A) and 2 kg of polyisobutylene powder are directly put into the internal mixer and pre-mixed for 10 minutes. The subsequent steps of internal mixer mixing, two-roller open mill sheet output, four-roller calendering, cooling, automatic cutting, and net-covering hot pressing are implemented according to the method described in Example 1, and the heat processing temperature is reduced by 2 to...

Embodiment 3

[0034] Preparation of raw materials: prepare the LLDPE particles in Example 1 (Mitsui Chemicals, brand: 20100J, melt index: 8.0g / 10min) and the LDPE particles in Example 2 (Yanshan Petrochemical, brand: 1I20A, melt index: 20g / 10min) 10min), all the other raw materials and preparation process are carried out as described in Example 1.

[0035] Semi-homogeneous membrane manufacturing: Weigh 20 kg non-thermoplastic cross-linked quaternary polystyrene anion exchange resin powder, 10 kg thermoplastic polyethylene-quaternary polystyrene anion exchange composite resin powder, 5 kg LLDPE powder (brand: 20100J), 4 kg of LDPE (brand: 1I20A) powder, and 2 kg of polyisobutylene powder are directly put into the internal mixer and pre-mixed for 6 minutes. Afterwards, the steps of internal mixer mixing, two-roller mill discharge, four-roller calendering, cooling, automatic cutting, net-covering and hot pressing are implemented according to the method described in Example 1, and the obtained ...

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Abstract

The invention discloses a manufacture method of a semihomogeneous anion-exchange membrane, comprising the following steps: 1) mixing thermoplastic polyethylene-quaternary amino polystyrene anion-exchange composite resin powder, non-thermoplastic crosslinked quaternary amino polystyrene anion-exchange resin powder, polyethylene powder and polyisobutylene powder according to a ratio; 2) melt-blending by an internal mixer, extruding by a two-roller open mill, continuously rolling by a four-roller mill, cooling by a cold-roll, and cutting by a cutting machine so as to obtain a prefabricated membrane; and 3) coating upper and lower surfaces of the prefabricated membrane with enhanced screen cloth, and compacting by a hot press so as to obtain the semihomogeneous anion-exchange membrane product. According to the prepared anion-exchange membrane product, internal quaternary amine groups with anion exchange effect are connected to each other and ceaseless such that membrane area resistance is greatly reduced. Various film forming materials have good compatibility and are tightly combined. Selective transmittance of the membrane is higher, and comprehensive properties of the membrane are obviously better than comprehensive properties of a conventional homogeneous anion-exchange membrane.

Description

technical field [0001] The invention belongs to the technical field of functional polymer film production, and in particular relates to a production method of a semi-homogeneous anion exchange membrane with polyethylene and quaternized crosslinked polystyrene as substrates. Background technique [0002] The electrodialysis technology with ion exchange membrane as the core component is more and more widely used. According to different membrane structures, ion exchange membranes can be divided into heterogeneous membranes, semi-homogeneous membranes and homogeneous membranes. Among them, the homogeneous ion-exchange membrane has excellent performance, but the manufacturing process is complicated and the technical difficulty is high, so the production and promotion are limited. However, heterogeneous ion exchange membranes are easy to produce, and although their overall performance is not good, they are still more commonly produced and applied in my country. Heterogeneous ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/72B01D67/00
Inventor 卿波莫剑雄
Owner HANGZHOU IONTECH ENVIRONMENTAL TECH
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