| abstract |
Disclosed herein is a water-soluble fully biodegradable material comprising a main material and a foaming agent, wherein the main material is a product formed by melting a mixture containing starch, polyol, and water-containing polyvinyl alcohol; and the polyvinyl alcohol is hydrophilic polyvinyl alcohol. The main material is a product formed from a molten mixture and has a melting temperature of 130-190 ° C which is much lower than its decomposition temperature of 250-400 ° C, therefore the water-soluble fully biodegradable material can achieve molten state, has thermoplastic processability incomparable to that of conventional simple physical mixture of polyvinyl alcohol, starch, and polyol, and can achieve real extrusion granulation and foam molding. The foam product prepared from the inventive material by foam molding has excellent foaming ratio, compression strength, resilience rate and dimension stability. The foam product can be dissolved in water so as to accelerate decomposition at waste treatment condition or ambient condition after disposal, and will not cause environment pollution. |