Degradable starch-based agricultural mulching film with added corn straws

Abstract

The invention discloses a degradable starch-based agricultural mulching film with added corn straws. The degradable starch-based agricultural mulching film is prepared from the following raw materials in parts by weight: 64 to 70 parts of dry base corn starch, 23 to 26 parts of ethanol, 11 to 15 parts of monochloro acetic acid, 14 to 16 parts of silicon dioxide, 0.08 to 0.1 part of epoxy chloropropane, 60 to 80 parts of dimethylformamide, 2 to 3 parts of a phosphinate type stabilizer, 3 to 4 parts of thiourea, 4 to 5 parts of urea, 16 to 20 parts of the corn straws, 3 to 4 parts of gelatin, 0.05 to 0.07 part of formaldehyde, 2 to 3 parts of mineral oil, 5 to 6 parts of talcum powder, 2 to 3 parts of an antioxidant, a proper amount of 85 percent ethanol solution and a proper amount of de-ionized water. The prepared starch film has high strength, water resistance and oil resistance; the raw materials are simple and easy to obtain, so that industrial large-batch production is convenient to realize; the degradable starch-based agricultural mulching film is long in service life and low in production cost, can increase the activity of soil after being degraded and is ecological and environment-friendly.

Description

Technical field [0001] The invention relates to the technical field of agricultural mulching films, in particular to a degradable starch-based agricultural mulching film added with corn stalks. Background technique [0002] At present, film mulching technology has been widely promoted in agriculture, and has been applied to the cultivation of wheat, rice, corn, soybeans, sorghum, cotton and other crops. The yield increase effect is obvious. Because the mulching film used in large quantities is a non-degradable polymer compound. It is neither eroded by microorganisms nor decomposed by itself. If things go on like this, it will inevitably bring unsolvable pollution hazards to future generations. Therefore, research on degradable mulch film has gradually received attention. Starch is an abundant renewable resource in nature. It is non-toxic and harmless and can be completely biodegradable. However, its poor mechanical properties and waterproof properties limit its application. It...

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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.