Modified starch composition for soil water retention and preparation method thereof

Abstract

The invention relates to the technical field of the chemical modification of starch, and particularly discloses a modified starch composition for soil water retention and a preparation method thereof. The preparation method comprises the following steps of getting a cross-linking agent and an etherifying agent to add into a reaction solvent, so as to obtain a mixed solution, and adding starch into the mixed solution to carry out a cross-linking and etherification reaction, so as to obtain a reaction material 1; getting sodium polyacrylate and guar gum to add into the reaction material 1, uniformly mixing an obtained first mixture, afterwards, adding water into the obtained first mixture, and agitating an obtained second mixture to carry out a reaction, so as to obtain a reaction material 2; carrying out drying and gelatinization treatment on the reaction material 2, so as to obtain the modified starch composition for the soil water retention, wherein the mass ratio of the sodium polyacrylate to the starch is (0.5 to 2): 100, and the mass ratio of the guar gum to the starch is (2 to 5): 100. The modified starch composition provided by the invention has quite good water absorption and water retention properties, cohesiveness and moldability, has water absorption capacity reaching 5 to 12 times of the mass of the modified starch composition self, can be used as an adhesive for preparing a soil water retention soil blank body, is finally decomposed into carbon dioxide and water in nature, and is not only harmless to a plant, can be but also absorbed and utilized by the plant.

Description

technical field [0001] The invention relates to the technical field of starch chemical modification, in particular to a modified starch composition for soil water retention and a preparation method thereof. Background technique [0002] Agriculture is the foundation of a country. The advancement, modernization and scientificization of agricultural planting directly affect the development of "agriculture, rural areas and farmers". The total area of ​​cultivated land in my country is 1.5 billion mu, including 570 million mu of dry land accounting for about 38% of the country's cultivated land area. In addition, there are large areas of barren hills and dry slopes for afforestation. Due to the low rainfall in my country and uneven distribution , which directly affects the improvement of agricultural productivity and the survival rate of afforestation trees. Moreover, my country is a country with a relative lack of water resources. Even the paddy fields that can be irrigated are ...

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Problems solved by technology

[0003] At present, it is usually by adding or mixing some effective water-absorbing and water-retaining materials or substances (such as perlite, vermiculite and sepiolite, etc.) in the soil to improve the water absorption and water-retaining properties of specific soils. Certain binders and forming agents are required. Most of the usual bonding forming agents are polyvinyl alcohol and cellulose ethers, which are not only costly, but also degrade slowly. After degradation, a large number of small molecular chemical substances are produced, which is not conducive to the growth of crops. to grow

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