Polyvinyl alcohol polarity sponge plastics and method of producing the same

Abstract

The present invention provides poly vinyl alcohol polar foam. Water is used as foamer and plasticizer. According to weight, water is 15 portions to 55 portions, and poly vinyl alcohol is 45 portions to 85 portions. The material are dissolved for expansion, melted and processed for foaming. The melting and processing foaming comprises a melting and extruding continuous foaming method and a moldingfoaming method. The poly vinyl alcohol polar foam is a plate material, sheet material, membrane or bead or square block. The poly vinyl alcohol polar foam of the present invention can be added with crosslinker, molecular composite agent, processing aid, nucleating agent and functional additive. According to the weight portion, the crosslinker is 0 portion to 2 portions, the molecular composite agent 0 portion to 10 portions, the processing aid 0 portion to 10 portions, the nucleating agent 0 portion to 5 portions and the functional additive 0 portion to 30 portions. When the poly vinyl alcohol polar foam of the present invention is used as heavy metal particles, adsorption, filtration and separation material of organic pollutant, the poly vinyl alcohol polar foam has the characteristics of rapid adsorption, easy desorption and capacity of being repeatedly washed.

Description

Polyvinyl alcohol polar foam plastic and its preparation method technical field The invention belongs to the field of foamed plastics or polymer foamed materials, in particular to a polyvinyl alcohol polar foamed plastic and a preparation method thereof. Background technique Heavy metal ions and organic pollutants in industrial and domestic wastewater have caused great pollution to the environment, and there is an urgent need for efficient and environmentally friendly separation materials and technologies. Existing polymer foam materials such as polyethylene, polypropylene, and polystyrene foam are non-polar foams with poor adsorption and separation effects. Generally, polar groups or bonded catalysts are introduced through chemical modification, and the preparation process is complicated. The cost is high, and it is difficult to make foam materials by melt processing. Polyvinyl alcohol (PVA) is a general-purpose polymer material with excellent performance and strong hyd...

AI Technical Summary

Problems solved by technology

The above-mentioned polyvinyl alcohol adopts the solution mechanical foaming method or chemical foaming method, the process is complex, the production cycle is long, and there are chemical foaming agents or acetal residues, which limit the application of polyvinyl alcohol foam materials and cannot prepare polyvinyl alcohol block foam