Preparation method of polyamino phosphoric acid functional-born polyether sulfone functional separating membrane

Abstract

The invention relates to a preparation method of polyamino phosphoric acid functional-born polyether sulfone functional separating membrane. The preparation method mainly comprises the following steps: by taking trichloromethane, chloroacetyl chloride and anhydrous aluminum chloride as main reagents, performing chloracetylation to the polyether sulfone at room temperature; then by taking N,N-dimethylacetylamide as a solvent and tetraethylenepentamine as an amination reagent, performing amination to the polyether sulfone, subjected to chloracetylation, at the temperature of 80-85DEG C, and preparing chloroacetyl chloride-tetraethylenepentamine- polyether sulfone anion-exchange membrane; then in methanol and triethylamine solution, by taking paraformaldehyde and phosphorous acid as reagents, performing phosphorylation graft modification to the chloroacetyl chloride-tetraethylenepentamine- polyether sulfone anion-exchange membrane, to prepare the polyamino phosphoric acid functional-born polyether sulfone functional separating membrane. The preparation method has good technological stability, the chelated functional groups of the prepared polyether sulfone functional separating membrane are difficult to lose, and the heavy metal pollutants in water environment can be effectively removed.

Description

technical field [0001] The invention relates to a preparation method of a separation membrane. Background technique [0002] In recent years, with the rapid economic development, there are more and more links involving metal processing and electroplating processes in the production process of aerospace, navigation, transportation, machinery manufacturing, hardware and electrical appliances, textiles and other industries, accompanied by the discharge of heavy metal pollutants As a result, the content of heavy metal pollutants in soil, water and the atmosphere exceeds the self-purification ability of the environment, which in turn leads to serious environmental pollution problems. As we all know, heavy metal pollutants discharged into the environment have the characteristics of bioaccumulation, they are not easy to biodegrade, and are easy to be activated after blunting, and the forms of heavy metal pollutants are complex and changeable, which can be transmitted through the bi...

AI Technical Summary

Problems solved by technology

However, the modified polyvinylidene fluoride microfiltration separation membrane prepared by this patented technology has poor stability of the chelating functional group, and butyl titanate and ethylenediamine tetramethylene phosphonic acid are bonded to form colloidal particles and polymer molecules. The strength of the interaction between them is weak, and the aminophosphonic acid groups blended into the separation membrane are easy to lose, resulting in a significant drop in the removal efficiency of heavy metals