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Crossblend separation membrane for polyvinyl chloride in high pass quantity and preparation method

A polyvinyl chloride, high-flux technology, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of poor hydrophilicity, low membrane separation efficiency, poor anti-pollution ability, etc., and achieve hydrophilic Enhanced performance, excellent performance, and improved hydrophilicity

Inactive Publication Date: 2005-01-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrophilicity of PVC material is poor, and the membrane separation efficiency is low, and the anti-pollution ability is also poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Preparation of medium molecular weight cut-off PVC / polyvinyl acetal polymer separation membrane

[0018] 7g of PVC and 7g of polyvinyl acetal high polymer were dissolved in 78g of N,N-dimethylformamide (DMF) solvent to prepare a blend solution. After the polymer is completely dissolved, add 8g of Li salt as an additive, stir and heat to dissolve. Put the blended solution in an oven to mature for 2 days. The temperature of the casting solution is 20°C. Under the conditions of room temperature 15°C and humidity 80%, cast the film on a clean glass plate. The evaporation time is 10 seconds, and then put it away immediately. Put it into the gel bath, the composition of the gel bath is water, the bath temperature is 20°C, after the film is automatically peeled off the glass plate, put it into distilled water and soak it for testing. The single-component Tgs of pure PVC and pure polyvinyl acetal polymers are 85.5°C and 57.9°C respectively. When PVC / polyvinyl acetal ...

Embodiment 2

[0020] Example 2 Preparation of low molecular weight cut-off PVC / polyvinyl acetal polymer separation membrane

[0021] Take 1.8g of PVC, 16.2g of polyvinyl acetal high polymer dissolved in 81.99g of N-methylpyrrolidone (NMP) solvent to prepare a blend solution. After the polymer is completely dissolved, add 0.01g of Li salt as an additive, stir and heat to dissolve. Put the blended solution in an oven to mature for 3 days. The temperature of the casting solution is 80°C. Under the conditions of room temperature 30°C and humidity 50%, cast the film on a clean glass plate. The evaporation time is 5 seconds, and then put it away immediately. Put it into the gel bath, the composition of the gel bath is NaCl, and the bath temperature is 5°C. After the film is automatically peeled off the glass plate, it is soaked in distilled water for testing. The single-component Tgs of pure PVC and pure polyvinyl acetal polymers are 85.5°C and 57.9°C respectively. When PVC / polyvinyl acetal poly...

Embodiment 3

[0023] Example 3 Preparation of high molecular weight cut-off PVC / polyvinyl acetal polymer separation membrane

[0024]Take 9.0g of PVC, 1.0g of polyvinyl acetal high polymer and dissolve it in 87g of N,N-dimethylacetamide (DMAC) solvent to prepare a blend solution. After the polymer is completely dissolved, add 3g of polyvinylpyrrolidone PVP as an additive, stir and heat to dissolve. Put the blended solution in an oven to mature for 3 days, cast the film at a temperature of 40°C, and cast it on a clean glass plate at a room temperature of 25°C and a humidity of 62%. The evaporation time is 150 seconds, and then put it away immediately Put it into the gel bath, the composition of the gel bath is water, the bath temperature is 30°C, after the film is automatically peeled off the glass plate, soak it in distilled water for testing. The single-component Tgs of pure PVC and pure polyvinyl acetal polymers are 85.5°C and 57.9°C respectively. When PVC / polyvinyl acetal polymers are b...

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PUM

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Abstract

A high-throughness separating PVC mixture membrane with high hydrophilicity is prepared through proportionally dissolving the polyvinyl alcohol, alkoholyzed halogene-fatty-acid-ene and PVC in organic solvent, adding additive, dissolving, ageing, doctor blading to form membrane, evaporating, and automatic stripping in gel bath.

Description

technical field [0001] The high-throughput polyvinyl chloride blended separation membrane and a preparation method thereof belong to the field of preparation of organic separation membranes. Background technique [0002] Polyvinyl chloride (PVC) is a traditional polymer material with good chemical stability and high mechanical strength. There are stable industrial products in my country, and it has been paid enough attention since the early stage of film development in my country. Its low price, strong resistance The advantages of acidity and alkalinity make it widely developed in the field of membrane separation technology. However, the hydrophilicity of PVC material is poor, and the membrane separation efficiency is low, and the anti-pollution ability is also poor. At present, the method commonly used to improve the hydrophilicity of PVC film is to blend PVC with other hydrophilic polymer organic compounds. The blending of vinyl chloride-vinyl acetate (VC-co-VAC) (≠Sun Bin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38
Inventor 彭跃莲刘淑秀隋燕纪树兰钱英
Owner BEIJING UNIV OF TECH
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