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Polystyrene/polyvinylidene fluoride quaternary ammonium type anion exchange alloy film preparation method

A polyvinylidene fluoride and polystyrene technology, applied in the field of functional polymer film preparation, can solve problems such as difficulty in ensuring product performance stability, high requirements for process control and equipment, and difficulty in precise control of the reaction process. Effect of quality control, film resistance reduction, elimination of structural defects

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

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Problems solved by technology

However, it is difficult to precisely control the reaction process if the functionalization reaction is to be carried out on the whole membrane, the requirements for process control and equipment are very high, and it is difficult to guarantee the stability of the performance of each batch of products

Method used

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  • Polystyrene/polyvinylidene fluoride quaternary ammonium type anion exchange alloy film preparation method

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preparation example Construction

[0014] Such as figure 1 Shown, the preparation method of polystyrene / polyvinylidene fluoride quaternary ammonium type anion exchange alloy membrane of the present invention, comprises the following steps:

[0015] 1. First, slowly add the monomer solution composed of styrene, crosslinking agent and initiator in a mass ratio of 100:2~10:1~10 into the polyvinylidene fluoride solution, and the monomer solution and polyvinylidene fluoride The mass ratio of the vinyl fluoride solution is 5~40:100, and it is fully mixed to obtain a uniform styrene / polyvinylidene fluoride composite solution.

[0016] The adopted monomer solution is uniformly mixed with styrene, cross-linking agent and initiator. The cross-linking agent used in the step (1) is divinylbenzene, and the usage amount is 2% to 10% of the mass of styrene; if the ratio is too small, the water content and swelling of the membrane will be too large, and if the ratio is too large Then it is difficult to implement subsequent t...

Embodiment 1

[0027] 1) Add 50 kg of polyvinylidene fluoride powder (brand DF-1, Shanghai Sanaifu Co., Ltd.) into a 500-liter glass-lined reactor, pour in 200 liters of dimethylacetamide, heat to 90°C, and stir for 2 Hours, a completely dissolved polyvinylidene fluoride solution was formed. In a 50-liter glass reactor, add 36 kg of styrene, 4 kg of divinylbenzene (63.2% purity, provided by Shangyu Puer Resin Co., Ltd.) and 2.4 kg of benzoyl peroxide, and stir for 1 hour at room temperature to obtain Styrene polymerized monomer solution. Slowly add the styrene monomer solution into the rapidly stirring polyvinylidene fluoride solution through the head tank, and finish the addition within 30 minutes, and then continue to stir for 30 minutes to obtain a uniform styrene / polyvinylidene fluoride composite solution .

[0028] 2) Subsequently, release the composite solution from the 500-liter glass-lined reactor, put it into a covered stainless steel polymerization container (volume 400 liters), ...

Embodiment 2

[0034] With 46 kilograms of styrene, 4 kilograms of divinylbenzene (content is 80.5%) and 3 kilograms of azobisisobutyronitrile, prepare styrene monomer solution, replace the styrene monomer solution in embodiment 1, all the other materials The ratio and operation method remain unchanged. According to the same method as in Example 1, the polystyrene / polyvinylidene fluoride quaternary ammonium anion exchange alloy membrane was prepared.

[0035] 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 0.32 mm, the water content is 50.7%, and the exchange capacity is 2.21 mmol / g Dry film, the surface resistance of the film is 3.7 Ω. cm 2 , the ion selective transmittance is 96.2%, and the membrane burst strength is 0.43 MPa.

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Abstract

The invention discloses a polystyrene / polyvinylidene fluoride quaternary ammonium type anion exchange alloy film preparation method, which comprises the following steps: dissolving polyvinylidene fluoride firstly, uniformly mixing the polyvinylidene fluoride and a polymerized monomer solution containing styrene, a cross-linking agent and an initiator, and then heating for copolymerization, extruding, solidifying, granulating, drying, crushing and other steps for obtaining polystyrene / polyvinylidene fluoride alloy powder; obtaining a quaternary ammonium type anion exchange alloy powder by applying chloromethylation reaction and amination reaction to alloy powder finally using a hot pressing moulding method, adding auxiliary material, banburying, milling, pulling sheet, hot pressing, cooling and obtaining polystyrene / polyvinylidene fluoride quaternary ammonium type anion exchange alloy membrane. The quaternary ammonium type anion exchange alloy membrane prepared by the invention has the advantages of high-molecular interpenetrating network structure, which completely eliminates the structure defect that the anion exchange resin powder and the high-molecular binder in the traditional interphase anion exchange membrane are not compatible with low resistor.

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 polystyrene / polyvinylidene fluoride quaternary ammonium anion exchange polymer alloy membrane with an interpenetrating network structure. Background technique [0002] Ion-exchange membranes are generally immobilized on the membrane with groups that can undergo ion exchange (or conduction), such as immobilized sulfonic acid groups that can exchange cations (such as sodium ions), and immobilized quaternary ammonium groups that can exchange anions (such as chloride ions). ). Due to the unique ion exchange (conduction) characteristics of the ion exchange membrane, it plays an increasingly important role in clean production, environmental protection, energy conversion, etc., and is especially suitable for desalination separation, new energy, energy saving, Reuse of low-grade raw materials and the need for environmental po...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00C08F212/08C08F8/44C08F8/24
Inventor 雷引林梅乐和罗云杰陈飞陈文澜
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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