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Method for modifying raw material nano SiO2 for preparing poly-vinylidene-fluoride composite film

A technology of polyvinylidene fluoride and modification method, which is applied in the preparation of raw materials and the modification of raw material nano-SiO2, which can solve the problems of uneven dispersion, easy aggregation of inorganic particles, and unsatisfactory film performance, and achieve uniform dispersion and difficulty in aggregation. Effect

Inactive Publication Date: 2005-12-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when added, the inorganic particles are easy to agglomerate and dispersed unevenly in the film, resulting in unsatisfactory performance of the film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: Dissolve 5g of γ-aminopropyltriethoxysilane in 100ml of acetone, disperse in 120W ultrasonic wave at 35°C for 10min; add glacial acetic acid to adjust the pH to 3, stir at 35°C for 1h; add ammonia water to adjust the pH to 11, Add 75g of SiO with a particle size of 15-20nm 2 Particles were heated to 100°C and continued to stir for 1 hour; dried in a vacuum oven at 80°C for 7 hours to obtain a white powder. Add it to the casting solution of polyvinylidene fluoride with a molecular weight of 600,000 to make SiO 2 The mass ratio of polyvinylidene fluoride to polyvinylidene fluoride is 1:10, and the water flux of the prepared membrane is 240L m -2 h -1 , the rejection rate of bovine serum albumin is 97.5%, and the porosity is 78%.

Embodiment 2

[0012] Example 2: Dissolve 8g of γ-chloropropyltriethoxysilane in 100ml of toluene, disperse in ultrasonic wave at 30°C for 15min; add glacial acetic acid to adjust pH to 4, stir at 30°C for 1.5h; add ammonia water to adjust pH to 11, Add 100g of SiO with a particle size of 10-20nm 2 Particles were heated to 100°C and continued to stir for 2 hours; dried in a vacuum oven at 80°C for 8 hours to obtain a white powder. Add it to the casting solution of polyvinylidene fluoride with a molecular weight of 440,000 to make SiO 2 The mass ratio of polyvinylidene fluoride to polyvinylidene fluoride is 1:6, and the water flux of the prepared membrane is 218L m -2 h -1 , the rejection rate of bovine serum albumin is 98.5%, and the porosity is 76%.

Embodiment 3

[0013] Example 3: Dissolve 12g of γ-chloropropyltriethoxysilane in 100ml of acetone, disperse in ultrasonic wave at 40°C for 30min; add glacial acetic acid to adjust pH to 3, stir at 40°C for 1h; add ammonia water to adjust pH to 12, add 150g of SiO with a particle size of 20-30nm 2 Particles were heated to 100°C and continued to stir for 3 hours; dried in a vacuum oven at 80°C for 10 hours to obtain a white powder. Add it to the casting solution of polyvinylidene fluoride with a molecular weight of 800,000 to make SiO 2 The mass ratio of polyvinylidene fluoride to polyvinylidene fluoride is 1:8, and the water flux of the prepared membrane is 226L m -2 h -1 , the rejection rate of bovine serum albumin is 98.0%, and the porosity is 79%.

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PUM

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Abstract

The present invention discloses a kind of embellishing method of nano SiO2 used for producing PVDF compound membrane. It belongs to material producing technology of compound membrane. The method includes following specific steps: dissolve silicon hydride into acetone or toluene to form dissolve silicon hydride solution, after dispersed in ultrasonic, add pure acetic acid to adjust pH value as mixed. After reacting 1 - 3 hours, add ammonia to adjust pH, and add SiO2 nanometer particles to control the quality proportion of SiO2 and silicon solution, increase temperature to have coupling reaction, dry the produce in vacuum drying oven for 6 - 10 hours at 80 Deg. C, then get the nanometer SiO2 used for producing PVDF compound membrane. The advantage is: produce SiO2 nanometer particles covered by silicon hydride according to structure and performance characteristics of PVDF membrane. These particles are uneasy to polymerize, so can be equably dispersed in polymers.

Description

technical field [0001] The invention relates to a raw material nano-SiO used to prepare a polyvinylidene fluoride composite film 2 modification method. It belongs to the preparation technology of the raw material of the composite membrane. Background technique [0002] With the development of modern industry, the water environment has shown a serious deterioration trend. For the sustainable development of human society, there must be corresponding water resources technology. On the one hand, reclaimed water reuse can reduce the pollution of the water environment, and on the other hand, it can realize the recycling of wastewater, which has good social and economic benefits. Membrane separation technology is an effective and practical method for reclaimed water reuse. Polyvinylidene fluoride has become a research hotspot of membrane materials due to its high thermal stability and good weather resistance, but the strength and hydrophilicity of p...

Claims

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Application Information

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IPC IPC(8): C08K3/36
Inventor 张裕卿曲云
Owner TIANJIN UNIV