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Preparation method for polystyrene/polyvinylidene fluoride cation exchange membrane

A polyvinylidene fluoride, cation exchange technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor product stability, poor proton conductivity, high production cost, and achieve reduced membrane resistance, Good chemical stability and thermal stability, the effect of eliminating structural defects

Active Publication Date: 2014-11-05
辽宁易辰膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Then these two base membranes are sulfonated to obtain a cation exchange membrane, which requires strict sulfonation reaction process control means and precision equipment, poor product stability, and high production costs
However, polyvinylidene fluoride / polypropylene sulfonic acid membrane (Chinese invention patent application number 200910077024.6) and polyvinylidene fluoride / polyionic liquid monomer membrane (Chinese invention patent application number 200910088228.X) can obtain cation exchange membrane after polymerization , there is no need to sulfonate the whole membrane, but because cheap polystyrene systems are not used, not only the cost of raw materials is high, but also the proton conductivity is not as good as that of polystyrene sulfonic acid membranes

Method used

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  • Preparation method for polystyrene/polyvinylidene fluoride cation exchange membrane
  • Preparation method for polystyrene/polyvinylidene fluoride cation exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]In a 500ml three-neck flask, add 50g of polyvinylidene fluoride powder (brand DF-1), add 180ml of dimethylacetamide, heat to 85°C, and stir for 90 minutes to form a transparent polyvinylidene fluoride solution. Take a 250 ml Erlenmeyer flask, add 36.5 g of styrene, 3.5 g of divinylbenzene (80.5% content) and 1.8 g of benzoyl peroxide, and stir magnetically at room temperature until the solid is completely dissolved to obtain a styrene polymerization solution. Slowly add the styrene polymerization solution dropwise into the high-speed stirred polyvinylidene fluoride solution, control the addition within 20 minutes, and then continue stirring for 30 minutes to obtain a homogeneous mixed solution.

[0030] Subsequently, the above mixed solution was poured into clean watch glasses in batches, wrapped and sealed with plastic wrap, placed in an oven, pre-polymerized at 75°C for 2 hours, and polymerized at 85°C for 12 hours. Take out the watch glass, take out the polymerized po...

Embodiment 2

[0035] 45.5 grams of styrene, 4.5 grams of divinylbenzene (80.5%) and 2.0 grams of benzoyl peroxide were used to prepare a styrene polymerization solution to replace the styrene polymerization solution in Example 1, and the remaining proportions remained unchanged. According to the same method as in Example 1, a finished polystyrene / polyvinylidene fluoride cation exchange membrane was prepared.

[0036] According to the determination method described in the national standard (HY / T 034.2-1994), the performance of the prepared cation exchange alloy membrane was measured, and the results are shown in Table 1. Membrane resistance is 40% lower than conventional polystyrene-based cation exchange heterogeneous membranes, and membrane strength is increased by 44%.

Embodiment 3

[0038] 55.2 grams of styrene, 4.8 grams of divinylbenzene (80.5%) and 2.0 grams of benzoyl peroxide were used to prepare a styrene polymerization solution to replace the styrene polymerization solution in Example 1, and the remaining proportions remained unchanged. According to the same method as in Example 1, a finished polystyrene / polyvinylidene fluoride cation exchange membrane was prepared.

[0039] According to the determination method described in the national standard (HY / T 034.2-1994), the performance of the prepared cation exchange alloy membrane was measured, and the results are shown in Table 1. The membrane resistance is 58% lower than that of conventional polystyrene-based cation exchange heterogeneous membranes, which is very close to that of cation exchange homogeneous membranes (generally, the membrane resistance of cation exchange homogeneous membranes is 2~4 Ω·cm 2 ); the membrane strength is 22% higher than that of conventional heterogeneous membranes.

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Abstract

The invention discloses a preparation method for a polystyrene / polyvinylidene fluoride cation exchange membrane. According to the method, polyvinylidene fluoride is used as a matrix material for the membrane. The method comprises the following steps: dissolving polyvinylidene fluoride and then fully mixing dissolved polyvinylidene fluoride with styrene and a cross-linking agent so as to obtain a homogeneous polymer solution; carrying out heat-initiated crosslinking copolymerization so as to obtain gelatinoid with an interpenetrating network structure; subjecting the gelatinoid to polymer physical processing so as to obtain polystyrene / polyvinylidene composite powder; then preparing cation exchange powder by using a sulfonation method for a storng-acid cation exchange resin as reference; and finally preparing the cation exchange membrane by using a hot pressing molding method for a heterogeneous cation exchange membrane. The polystyrene / polyvinylidene fluoride cation exchange composite high polymer membrane prepared in the invention has the interpenetrating network structure, so the structural defect of incompatibility between cation exchange resin powder and a high polymer binder in conventional heterogeneous cation exchange membranes is eradicated, membrane resistance is substantially reduced, and comprehensive properties of the polystyrene / polyvinylidene fluoride cation exchange membrane in the invention are closer to comprehensive properties of cation exchange membranes.

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 cation exchange composite polymer 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, such as immobilized sulfonic acid groups that can exchange cations, and immobilized quaternary ammonium groups that can exchange anions. Due to the unique ion exchange characteristics of the ion exchange membrane, it plays an increasingly important role in clean production, environmental protection, energy conversion, etc. Fresh air for air conditioning), reuse of low-grade raw materials (such as waste acid / waste alkali recovery) and environmental pollution control (such as industrial wastewater treatment). [0003] According to different structures, ion exchang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D67/00C08F212/08C08J7/12
Inventor 雷引林莫剑雄孙晓成陈飞罗云杰刘富沈立强叶建荣
Owner 辽宁易辰膜科技有限公司
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