Novel starch-polyvinyl alcohol blend fully-degradable plastic film and preparation method thereof

Abstract

The invention discloses a novel starch-polyvinyl alcohol blend fully-degradable plastic film. The novel starch-polyvinyl alcohol blend fully-degradable plastic film is characterized by being prepared from the following raw materials in parts by weight: 60-65 parts of corn starch, 7-9 parts of nano montmorillonite, 0.6-0.7 part of peanut oil, 1.2-1.4 parts of tetrabutyl titanate, 12-14 parts of ramie sticks, 30-35 parts of polyvinyl alcohol, 2-3 parts of gelatin, 1-2 parts of magnesium stearate, 13-15 parts of acetyl tributyl citrate, 4-6 parts of nano titanium dioxide, and 1-1.5 parts of 2,6-di-tert-butyl-4- methyl phenol. The product disclosed by the invention is produced by a safe formula, and can be used for manufacturing a food packaging bag and the like; in use, the product is high in strength, waterproof, oil-resistant and durable in use, beneficial to realizing large-scale industrial production, easy to grasp, and convenient to popularize; and under the action of oxygen enrichment and microorganisms, the wasted product is automatically degraded and finally generates carbon dioxide and water, so that the novel starch-polyvinyl alcohol blend fully-degradable plastic film is ecological and environmentally-friendly.

Description

technical field [0001] The invention relates to the technical field of plastic films, in particular to a novel starch-polyvinyl alcohol blended fully degradable plastic film and a preparation method thereof. Background technique [0002] In recent years, due to the increasingly serious "white pollution" caused by waste plastics that are difficult to degrade, it has attracted widespread attention from all over the world. Countries around the world have successively issued relevant laws and regulations restricting or prohibiting the use of non-degradable plastic packaging. On the other hand, because petroleum, the raw material for making traditional plastics, is a non-renewable resource, it will be exhausted with the massive use of human beings. Therefore, it is imminent to develop environmentally friendly plastics that use renewable resources as raw materials and are degradable. [0003] The use of biodegradable starch materials to prepare degradable packaging films has becom...

AI Technical Summary

Problems solved by technology

However, while starch improves the degradability of plastics, on the one hand, it will cause a decrease in its physical and mechanical properties, making it difficult to process. On the other hand, it is also too hydrophilic, which is not compatible with most general-purpose resins. Poor, resulting in a significant decline in the mechanical properties of the film, poor water resistance, thus hindering the wide application of starch plastics in the process of industrialization

[0004] Polyvinyl alcohol is a widely used high molecular polymer, its performance is between plastic and rubber, it contains a large number of polar hydroxyl groups, its toxicity is very low, its molecular chain structure is symmetrical and regular, and it has unique strong adhesion, Film flexibility, smoothness, oil resistance, solvent resistance, protective colloid, gas barrier and water resistance after special treatment, but also has a certain degree of biodegradability, in the presence of bacteria in a wet environment 6 It can be completely decomposed into water and carbon dioxide within one month. It is a completely biodegradable material, but the degradation process has high requirements on the degradation environment, so the degradation rate is still relatively slow.