Environment-friendly packaging bag

The invention discloses an environment-friendly packaging bag which comprises, by weight, 60-80 parts of polyvinyl alcohol, 40-60 parts of polyurethane resin, 45-60 parts of modified starch, 15-30 parts of cellulose, 8-12 parts of silicon dioxide, 10-14 parts of calcium carbonate, 3-7 parts of zinc oxide, 1-3 parts of paraffin, 4-8 parts of epoxy soybean oil and 1-2 parts of antioxidant, and the modified starch is prepared from dry starch, acetic anhydride, octenyl succinic anhydride and water. The environment-friendly packaging bag has good mechanical performance and biodegrading performanceand is quite durable, sanitary and environment-friendly, so that environment pollution is lowered. 本发明公开了种环保包装袋，其原料按重量份包括：60-80份聚乙烯醇、40-60份聚氨酯树脂、45-60份改性淀粉、15-30份纤维素、8-12份二氧化硅、10-14份碳酸钙、3-7份氧化锌、1-3份石蜡、4-8份环氧大豆油、1-2份抗氧剂；所述改性淀粉的原料包括干淀粉、醋酸酐、辛烯基琥珀酸酐、水。本发明的环保包装袋具有良好的机械性能、生物降解性能，包装袋非常耐用，卫生环保，降低了对环境的污染。