Polyvinyl alcohol sponge with high elongation and preparation method thereof

Abstract

The invention discloses a polyvinyl alcohol sponge with high elongation and a preparation method thereof. The method comprises the following steps: mixing polyvinyl alcohol, cellulose, carbonate and deionized water, and performing stirring under a closed condition until the components are completely dissolved to obtain a uniform polyvinyl alcohol solution; adding a mixture of an emulsifier and esters into the polyvinyl alcohol solution, and performing stirring until the reaction is complete to obtain a white viscous solution; adding a foaming agent into the white viscous solution, and performing stirring by using a strong stirrer until bubbles with uniform sizes are generated in the solution, so as to obtain a foamed solution; and pouring the foamed solution into a mold, and carrying out freeze thawing to obtain the polyvinyl alcohol sponge with high elongation. Compared with an existing polyvinyl alcohol sponge manufacturing process, the freeze thawing method used in the method has the advantages of being easy to control, good in environmental protection property, little in resource waste, capable of avoiding harm of formaldehyde to human health and the like.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, in particular to a polyvinyl alcohol sponge with a high elongation rate and a preparation method thereof. Background technique [0002] Polyvinyl alcohol (Polyvinyl Alcohol, PVA) sponge is composed of a mesh structure cross-linked by numerous polymer chains. Polyvinyl alcohol has strong hydrophilicity, so it can absorb and store a large amount of water, and maintain a certain mechanical strength after absorbing water. In addition, polyvinyl alcohol is a polymer material with light weight, and it can be made into a porous sponge structure, which can also be used in fields such as heat insulation and sound insulation. [0003] Existing polyvinyl alcohol sponge is mainly polyvinyl formal sponge. In terms of resources and environmental protection, the preparation of polyvinyl formal sponge generally uses starch as an auxiliary foaming agent. After the sponge is solidified and formed, the exc...

AI Technical Summary

Problems solved by technology

This preparation method needs to consume a large amount of water, resulting in waste of resources and environmental pollution

In terms of the mechanical properties of the sponge, if the starch in the sponge is not completely washed off, the sponge is easily corroded during use

In addition, during the preparation process, the reaction conditions are difficult to precisely control

If the heating rate is too fast, the acetal is too high, which will cause the sponge to agglomerate and form a compact material, and the mesh structure is difficult to form well, making it difficult for the reactants to continue to interact

The stretchability of the polyvinyl formal sponge obtained in this way is relatively poor, and the stretch rate is generally 200-300%, and the sponge structure is easily destroyed in the repeated stretching process.

In terms of personal health, the above preparation method uses formaldehyde, so the product inevitably contains free formaldehyde, which will cause potential health hazards to both the preparation experimenters and product users

Images