Starch-based degradable plastic film with excellent oxygen resistance

Abstract

The invention discloses a starch-based degradable plastic film with excellent oxygen resistance. The starch-based degradable plastic film is prepared from, by weight, 64-70 parts of dry-base corn starch, 23-26 parts of ethyl alcohol, 11-15 parts of monochloro acetic acid, 14-16 parts of silicon dioxide, 0.08-0.1 part of epichlorohydrin, 60-80 parts of dimethylformamide, 3-4 parts of mineral oil, 4-6 parts of sodium caseinate, 3-4 parts of bamboo polysaccharide, 4-5 parts of coconut shell charcoal, 0.1-0.2 part of methyl methacrylate, 2-3 parts of zinc stearate, 3-4 parts of microcrystalline wax, appropriate 85% ethanol solution and appropriate deionized water. The agricultural plastic film has high tensile strength and elongation at break and good gas barrier property, water retention, oxidation resistance and the like, is long in service life, fully degradable and worth of popularization, and has no impact on the environment.

Description

technical field [0001] The invention relates to the technical field of agricultural mulching films, in particular to a starch-based degradable mulching film with excellent oxygen barrier properties. Background technique [0002] At present, plastic film mulching technology has been widely promoted in agriculture, and has been applied to the planting of wheat, rice, corn, soybean, sorghum, cotton and other crops, and the effect of increasing production is obvious. It is neither corroded by microorganisms nor decomposed by itself. If things go on like this, it will inevitably bring pollution hazards that are difficult to solve for future generations. Therefore, research on degradable mulch has gradually attracted attention. Starch is an abundant renewable resource in nature. It is non-toxic, harmless, and completely biodegradable. However, its poor mechanical properties and waterproof properties limit its application. Its application is limited. Starch is a renewable resou...

AI Technical Summary

Problems solved by technology

[0003] In the article "Study on Hydrophobic Modified Starch / PVA Biodegradable Plastic Mulch Film", the author used corn starch as raw material, which was double-modified by carboxymethyl etherification and cross-linking. The molar ratio of starch is 1.85, the etherification time is 2.33h, and the concentration of ethanol is 84.65%. The dosage is 1.5%, and then get cross-linked carboxymethyl starch with strong thermoplasticity, and then use it to blend with PVA. After cross-linking, speed-up, and hydrophobic modification, the mechanical properties of the film meet the standard requirements, and the water absorption rate is greatly improved. However, its comprehensive performance is still not up to the needs of actual use, and it needs to be further modified to meet various use requirements, so as to improve the mechanical properties, toughness, strength and other properties of starch films, and expand the scope of application.