Controllable starch-based biodegradable agricultural mulching film

Abstract

The invention discloses a controllable starch-based biodegradable agricultural mulching film. The agricultural mulching film is prepared from PBAT+PLA or PBAT+PLA+MTPS or PBAT+PLA+MTPS+bagasse cellulose with a chain extender and a mold release agent. Based on the formula, degradation time and degradation efficiency of the biological mulching film can be adjusted and controlled in combination withan under-film drip irrigation technology by adjusting the composition ratio according to climate characteristics as well as growth and development and laws of water and fertilizer requirements of covered crops. The best mulching days for local mulched crops are reached in the safety period, the prospective effects of warming and preserving soil moisture, controlling weeds, reducing chemicals, stabilizing yield and increasing income in the mulching period are ensured, and the film can be degraded in time at the later growth stage or after harvest, and is finally decomposed into water and carbondioxide by soil microorganisms without polluting soil and ecological environment; a cheap modified starch-based composite material and sugarcane cellulose are added to the formula, so that the production cost can be greatly reduced, and the mulching film has better comprehensive performance and good market application prospect.

Description

technical field [0001] The invention relates to an agricultural mulch film, in particular to a controllable starch-based biodegradable agricultural mulch film, which belongs to the technical field of polymer materials. Background technique [0002] Mulch film has the functions of warming, moisturizing, and weed prevention, which is beneficial to the growth and development of crops and can greatly increase crop yield. However, ordinary agricultural mulch is extremely difficult to degrade under natural conditions, and manual recycling is costly and laborious, and it is difficult to clean thoroughly. The residual film continues to accumulate in the soil, resulting in changes in the physical structure of the soil, and the downward transport of soil moisture and nutrients. If it is hindered, the porosity and permeability of the soil will decrease, resulting in a decline in the quality of cultivated land. At present, the biodegradable mulch film used in agriculture has many advan...

AI Technical Summary

Problems solved by technology

However, ordinary agricultural mulch is extremely difficult to degrade under natural conditions, and manual recycling is costly and laborious, and it is difficult to clean thoroughly. The residual film continues to accumulate in the soil, resulting in changes in the physical structure of the soil, and the downward transport of soil moisture and nutrients. Obstructed, the porosity and permeability of the soil are reduced, resulting in a decline in the quality of cultivated land

At present, the biodegradable mulch film used in agriculture has many advantages in terms of crop yield increase, soil and environmental protection, etc., but the cost of materials is high, and it is difficult to promote large-scale production; on the other hand, it is affected by climate conditions and crop growth and development. The law of fertilizer and water demand has a great influence. Although it can degrade itself within a certain period of time and has no residue and pollution to the soil, its degradation time and degradation efficiency are difficult to control, and it does not have the degradation characteristics suitable for cover crops.

It begins to degrade at the seedling stage or low temperature period of crops, and cannot achieve the effect of increasing temperature and moisture conservation. Degradation is delayed after crop growth or harvest, which seriously affects the planting time and growth of the next crop, thus restricting its promotion and application value.

Images