Low-cost high-strength full-biodegradable agricultural mulching film and in-situ reaction extrusion plasticizing compatibilization preparation process thereof

Abstract

The invention relates to a low-cost high-strength full-biodegradable agricultural mulching film and an in-situ reaction extrusion plasticizing compatibilization preparation process thereof. PBAT and starch are used as base materials, and urea aldehyde is used as a plasticizing compatibilizer. A reaction precursor hydroxymethyl urea solution of the plasticizing compatibilizer urea aldehyde is mixed with the starch, so that micromolecular hydroxymethyl urea can be conveniently attached to the surfaces of starch particles or enter the starch particles, and hydrogen bonds between molecular chains and in the molecular chains of the starch are remarkably damaged; during extrusion in a screw extruder, hydroxymethyl urea is subjected to an in-situ polycondensation reaction on the surfaces of starch particles and in the starch particles to generate a urea-aldehyde polymer, and active groups such as acylamino and amino on a urea-aldehyde macromolecular chain can interact with active functional groups on starch and a PBAT macromolecular chain respectively; therefore, the PBAT / starch composite material is plasticized and compatibilized. On one hand, the PBAT / starch composite material is more suitable for blow molding film preparation, and on the other hand, the mechanical property of the prepared mulching film can be greatly improved.

Description

technical field [0001] The invention relates to the field of biodegradable agricultural mulch films, in particular to a low-cost and high-strength fully biodegradable agricultural mulch film and an in-situ reaction extrusion plasticizing and compatibilizing preparation process thereof. Background technique [0002] In the late 1970s, China began to experiment and promote plastic film technology, which brought about a "white revolution in agriculture". After more than 30 years of development, agricultural plastic film has been widely promoted and applied in my country, and has gradually become the fourth largest agricultural production material after seeds, pesticides and fertilizers. However, under the background of returning to ecological agriculture and developing a green economy, the large-scale application of pesticides and chemical fertilizers is no longer advocated, and the drawbacks of the traditional non-degradable plastic film, which once played a major role in incr...

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Problems solved by technology

However, due to the destruction of a large number of starch granules, the mechanical properties of the prepared starch / polymer composites are generally not high.

The plasticization process of starch will also increase the production cost of degradable mulch, so a simpler and more effective starch pretreatment method is needed to reduce the production cost of mulch

In addition, the degradation cycle of degradable plastic film is often longer. When planting crops with a shorter growth cycle, the shortcoming of a longer degradation cycle is obvious; and its decomposition in the soil will also affect the activity of some microorganisms, resulting in Nutrients cannot be fully absorbed and utilized by plants

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