| 摘要 |
<p>A water soluble biodegradable material comprising a host material and a blowing agent wherein said host material is a product obtained by melting of a mixture, said mixture contains starch, polyol and aqueous polyvinyl alcohol, said polyvinyl alcohol is hydrophilic polyvinyl alcohol. Because the host material contained in the water soluble biodegradable material of the invention is the product obtained by melting of the mixture, the melting temperature is far less than the decomposition temperature, so that a molten stat can be attained and true extrusion pelletizing and foam moulding can be realized. Various different foamed articles can be obtained by foam moulding of said water soluble biodegradable material, and the resulting foamed article has good foaming times, compression strength, compression resilience and size stability, has very high degradation rate. Said foamed article can be dissolved in water at scrap treatment condition or at natural condition after being used, to promote degradation and there is no environment pollution.</p> |
