In-situ preparation method of Al(Zr)-PVDF (polyvinylidene fluoride) hybrid film
An in-situ preparation and hybrid membrane technology, which is applied in the field of membrane separation, can solve the problems of high control cost, difficult hydrolysis reaction, and limited application, and achieve the effect of low equipment requirements, remarkable hydrophilic performance, and easy operation
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Embodiment 1
[0020] First, ultrasonically dissolve 1 g of zirconium oxychloride in 100 g of N,N-dimethylformamide, then add a certain amount of 201×7 resin for ion exchange, when the Cl in N,N-dimethylformamide - OH on the resin - After the exchange is complete, the anion exchange resin in the solvent is filtered off to obtain an organic solvent sol system in which zirconium species are uniformly dispersed. The PVDF polymkeric substance of 18g is dissolved in the obtained organosol, obtains uniform, transparent casting film liquid, at 70 o After standing at C for 4 hours for degassing, scrape flat membrane at room temperature, place it in the air for 30 seconds, and then immerse it in a coagulation bath completely composed of deionized water. After soaking for 24 hours, the formed Zr-PVDF ultrafiltration membrane is re- After soaking in glycerin solution for 4h, air-dry naturally. The nanoparticles in the obtained film are uniformly distributed, and the particle diameter is 10-20nm. The...
Embodiment 2
[0022] First, ultrasonically dissolve 1.5g of zirconium oxychloride in 100g of N,N-dimethylformamide, then add a certain amount of 201×7 resin for ion exchange, when the Cl in N,N-dimethylformamide - OH on the resin - After the exchange is complete, the anion exchange resin in the solvent is filtered off to obtain an organic solvent sol system in which zirconium species are uniformly dispersed. The PVDF polymkeric substance of 18g is dissolved in the obtained organosol, obtains uniform, transparent casting film liquid, at 70 o After standing at C for 4 hours for degassing, scrape flat membrane at room temperature, place it in the air for 30 seconds, and then immerse it in a coagulation bath completely composed of deionized water. After soaking for 24 hours, the formed Zr-PVDF ultrafiltration membrane is re- After soaking in glycerin solution for 4h, air-dry naturally. The nanoparticles in the obtained film are uniformly distributed, and the particle diameter is 10-20nm. The...
Embodiment 3
[0024] First, ultrasonically dissolve 2g of aluminum chloride in 100g of N,N-dimethylformamide, then add a certain amount of 201×7 resin for ion exchange, when the Cl in N,N-dimethylformamide - OH on the resin - After the exchange is complete, the anion exchange resin in the solvent is filtered off to obtain an organic solvent sol system in which zirconium species are uniformly dispersed. The PVDF polymkeric substance of 18g is dissolved in the obtained organosol, obtains uniform, transparent casting film liquid, at 70 o After standing for 4 hours at C for degassing, scrape a flat membrane at room temperature, place it in the air for 30 seconds, and then immerse it in a coagulation bath completely composed of deionized water. After soaking for 24 hours, the formed Al-PVDF ultrafiltration membrane is re- After soaking in glycerin solution for 4h, air-dry naturally. The nanoparticles in the obtained film are uniformly distributed, and the particle diameter is 10-20nm. The con...
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