Multifunctional degradable liquid mulch film and preparation method and usage method thereof

Abstract

The invention relates to the field of agricultural application, in particular to a multifunctional degradable liquid mulch film with macromolecule polymer as the main component and a preparation method and a usage method thereof. The mulch film comprises according to the weight percentage 2%-8% of polyvinyl alcohol, 2%-6% of carboxymethylcellulose sodium, 0.1%-0.5% of a crosslinking agent, 0.2%-0.5% of a defoaming agent, 0.3%-0.7% of glycerol and the balance of water. The mulch film provided by the invention is fully stirred with water and sprayed on the soil surface; the macromolecular hydrophilic groups can effectively combine with active sites on soil particles to form a crosslinking layer on the soil surface, so as to inhibit the moisture evaporation of soil and reduce soil erosion. The product has the effects of shortening seedling emergence time of crops, improving soil structure, promoting crop yield and avoiding pollution to the soil environment, can improve the shortage of agricultural water resources in semiarid area to a certain extent, and has broad application prospects.

Description

technical field [0001] The invention relates to the field of agricultural applications, in particular to a multifunctional degradable liquid mulch film with a high molecular polymer as the main component and a preparation method and application method thereof. Background technique [0002] The shortage of water resources in arid and semi-arid areas is one of the bottlenecks restricting the development of local agriculture. For example, in 2008, 12,136.8 thousand hectares of crops were affected by drought in the whole country, of which 6797.5 thousand hectares were affected and 811.8 thousand hectares were not harvested. 16.06 billion kilograms, and 22.62 billion yuan in economic crop losses. Therefore, how to solve the problem of agricultural water shortage has become an important challenge for agricultural science and technology workers. [0003] Field mulching technology and chemical control water-saving technology are two important measures to save agricultural water res...

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Problems solved by technology

[0004] At present, there are a lot of liquid mulch patents, but there are problems, such as CN1209443, whose functional component is hydroxychlorobutanol latex resin solution, CN1195044C, which uses kelp powder, alpha starch, phosphoric acid starch, etc. as raw materials, which are expensive and difficult to apply on a large scale; CN1277228 Since the main component is petroleum asphalt or oil residue, the source of raw materials is limited and has certain environmental toxicity; CN101402794B is a polyether polyol-polyvinyl alcohol-polyaspartate polymer whose functional components are difficult to control because of its components , its product performance is difficult to control

However, some existing products on the market also have many problems, such as poor freeze-thaw stability, poor storage stability, unstable product performance, and mixing with water to easily generate foam and affect the spraying effect.

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