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Polystyrene /polystyrene anion exchange alloy film preparation method

A technology based on polyvinylidene fluoride and polystyrene, which is applied in the field of functional polymer film preparation, can solve the problems of weak monomer immersion and absorption capacity, and achieve the effects of eliminating structural defects, avoiding use, and reducing film resistance

Inactive Publication Date: 2013-07-31
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyvinylidene fluoride or polyvinylidene fluoride-polyisobutylene composite particles used in this invention have a weak soaking ability to the monomer (composed of styrene and crosslinking agent), so it is difficult to process chloromethylation, Anion-exchange alloy membranes with high ion-exchange capacity obtained after amination

Method used

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  • Polystyrene /polystyrene anion exchange alloy film preparation method

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preparation example Construction

[0013] Such as figure 1 Shown, the preparation method of polyvinylidene fluoride / polystyrene-based anion exchange alloy membrane of the present invention comprises the following steps:

[0014] 1. First, drop the polymerized monomer solution composed of chloromethylstyrene, crosslinking agent and initiator according to the mass ratio of 100:2~10:3~10 into the polyvinylidene fluoride solution, and polymerize the monomer solution The mass ratio with polyvinylidene fluoride solution is 5~40:100, fully mixed to obtain a uniform polymer composite solution.

[0015] The adopted polymerization monomer solution is uniformly mixed with chloromethyl styrene, a cross-linking agent and an initiator. The chloromethyl styrene used is m-chloromethyl styrene or p-chloromethyl styrene, and a mixture of the two in any mass ratio. The cross-linking agent used is divinylbenzene, and the usage amount is 2%~10% of the mass of chloromethyl styrene; if the proportion is too small, the water content...

Embodiment 1

[0024] Step 1: Add 500 grams of polyvinylidene fluoride powder (brand FR904, Shanghai Sanaifu Co., Ltd.) into a 5-liter glass interlayer reactor, pour in 2 liters of dimethylacetamide, heat to 80°C, and stir for 2 hours , forming a completely dissolved polyvinylidene fluoride solution. In a 500ml Erlenmeyer flask, add 412 grams of chloromethylstyrene (containing 75.2% p-chloromethylstyrene, 21.9% m-chloromethylstyrene), 34 grams of divinylbenzene (63.2%) and 24 grams of benzoyl peroxide was stirred at room temperature for 1 hour to obtain a polymerized monomer solution. The polymerized monomer solution is slowly added dropwise into the rapidly stirred polyvinylidene fluoride solution through a constant pressure funnel, and the addition is controlled within 30 minutes, and then the stirring is continued for 30 minutes to obtain a uniform polymer composite solution.

[0025]Step 2: The polymer composite solution containing polymerized monomers and vinylidene fluoride is heated ...

Embodiment 2

[0030] With 500 grams of chloromethylstyrene (containing 75.2% of p-chloromethylstyrene and 21.9% of m-chloromethylstyrene), 45 grams of divinylbenzene (63.2%) and 26 grams of benzoyl peroxide, Respectively replace 412 grams of chloromethylstyrene, 34 grams of divinylbenzene and 24 grams of benzoyl peroxide in the first step in Example 1; all the other proportioning and manufacturing conditions are unchanged.

[0031] According to the measurement method described in the national standard (HY / T 034.2-1994), the performance parameters of the prepared anion exchange alloy membrane are as follows: the average thickness of the membrane is 0.37 mm, the water content is 45.2%, and the exchange capacity is 2.25 mmol / g Dry film, the surface resistance of the film is 3.7 Ω. cm 2 , the ion selective transmittance is 97.6%, and the membrane burst strength is 0.58 MPa.

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Abstract

The invention discloses a polystyrene / polystyrene anion exchange alloy film preparation method, which comprises the following steps: adding a polymerized monomer solution which is composed of 1-(chloromethyl)-4-ethenylbenzene, a cross-linking agent and an initiator into a polyvinylidene fluoride solution, and then heating for copolymerization, extruding, solidifying, granulating, drying, crushing and other steps for obtaining PCMS / polyvinylidene fluoride alloy powder; reacting the alloy powder and the amination solution, washing, transforming, drying and obtaining the anion exchange powder; finally using a hot pressing moulding method, adding auxiliary material, banburying, milling, pulling sheet, hot pressing and obtaining polyvinylidene fluoride / polystyrene anion exchange alloy membrane. The anion exchange alloy membrane manufactured by the invention has the advantages of high-molecular interpenetrating network structure, whose membrane area resistance is greatly lower than the traditional interphase anion exchange membrane, and the comprehensive properties of the membrane approaches to the homogeneous anion exchange membrane. The invention avoids the usage of carcinogenic reagent chloromethyl ether, and is easy for realization of industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional polymer membranes, in particular to a preparation method of a polyvinylidene fluoride / polystyrene-based anion exchange alloy membrane with an interpenetrating network structure. Background technique [0002] Due to its unique ion exchange (conduction) characteristics, ion exchange membranes are playing an increasingly important role in clean production, environmental protection, energy conversion, etc., and are especially suitable for modern industrial desalination (or concentration) separation, new energy, The needs of energy saving, low-grade raw material reuse and environmental pollution control. Ion exchange membranes can be broadly classified into heterogeneous membranes and homogeneous membranes. Among them, the heterogeneous ion exchange membrane is generally manufactured by hot pressing molding process, which is relatively simple and the production cost is relatively low...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00C08F212/14C08F8/44
Inventor 雷引林梅乐和罗云杰陈飞
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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