Preparation method of modified polypropylene melt-blown filter element

Abstract

A preparation method of a modified polypropylene melt-blown filter element is characterized by comprising the following steps: (1) preparation of a polypropylene melt-blown filter element: uniformly mixing polypropylene with an additive introduced with a modification site, pouring into a charging barrel, extruding the raw materials by an extruder, drawing into filaments under the traction of hot air at the temperature of 200-300 DEG C, then winding and cutting on a receiving rod, and thus obtaining the polypropylene melt-blown filter element; and (2) amination modification of the polypropylene melt-blown filter element: putting the polypropylene melt-blown filter element into a polyamine modified solution, heating under a water bath condition to initiate amination modification of the polypropylene filter element, and cleaning and drying to obtain the modified polypropylene melt-blown filter element. Modification sites are introduced in the melt-blowing process of the PP filter element to lay a foundation for introduction of an amine adsorbent, and the PP filter element is modified by adopting an amine monomer and used for removing heavy metals; and the adsorption sites are grafted to the surface of the material through chemical reaction, the adsorption sites are firmly combined, and the removal effect is stable.

Description

technical field [0001] The invention relates to a filter element for water purification, in particular to a filter element made of polypropylene. Background technique [0002] At present, the filter materials for removing heavy metals are mainly composed of the following categories: fibers, resins, separation membranes and activated carbons, fibers such as chelating fibers, or fiber filter materials prepared by other methods; resin modified ion The exchange resin has a certain function of removing heavy metals; the separation membrane is prepared by phase inversion, and the adsorbent is introduced to the surface of the separation membrane (such as a hollow fiber membrane), so as to realize the function of removing heavy metals. Activated carbon achieves the function of removing heavy metals by modifying the carbon powder or introducing an adsorbent during the sintering process. [0003] The Chinese invention patent application with the application number 201810869708.9 disc...

AI Technical Summary

Problems solved by technology

This method has many steps and complicated process, and the active groups grafted by plasma technology have poor uniformity and stability

[0005] At present, the following problems commonly exist in the existing heavy metal removal materials: First, the preparation process is complicated and the cost is high: firstly, it needs to be prepared into fibers, membrane filaments or ion exchange resins, and then made into filter elements. The process is complicated and there are many links. Second, the material preparation process uses a