A pH-controlled release microcapsule polymer saline-alkaline soil modifier and preparation method thereof

Abstract

The invention provides a pH controlled release microcapsule type macromolecular saline-alkaline soil modifier and a preparation method thereof. The pH controlled release microcapsule type macromolecular saline-alkaline soil modifier is made by the following raw materials in parts by weight: 300 parts of organic polymer, 50-100 parts of an active divalent cation material, 0.05-5 parts of a catalyst, 300-2000 parts of an organic solvent, 0.05-4 parts of a surfactant, 0.05-2 parts of a cross-linking agent, 10-250 parts of a pH sensitive material and 100-1000 parts of water. According to the pH controlled release microcapsule type macromolecular saline-alkaline soil modifier, the release rate of active cations can be controlled according to the change of the pH value of the soil, so that the long-acting property of replacing sodium ions in the colloidal particles of the saline-alkaline soil can be achieved; meanwhile, a polymer material polymerizes small-particle-size aggregates to form stable large-particle-size aggregates, so that the porosity of the soil is increased, and the problems of high salinity of the saline-alkaline soil, poor soil structure and the like are solved. The saline-alkaline soil modifier provided by the invention has the advantages of strong desalting capacity, excellent soil particle polymerization property, long action effect, good environmental benefit andwide application prospect.

Description

technical field [0001] The invention relates to the technical field of soil improvement, in particular to a pH-controlled release microcapsule polymer saline-alkaline soil improver and a preparation method thereof. Background technique [0002] Saline-alkali soil is a general term for saline soil and alkaline soil. During the formation of this type of soil, soluble salts are redistributed and accumulated in the soil, resulting in higher soil salt content than normal soil (2g / kg) or alkalization (substitutional sodium The ratio of ions to soluble cations) is greater than 20%, which seriously restricts the normal growth of crops. According to statistics, saline-alkali soil is distributed in more than 100 countries around the world, with a total area of ​​up to 1×10 9 hectare. As an important reserve land resource, its rational development and utilization to increase the amount of cultivated land and ensure national food security are currently hot issues. [0003] Excessive ...

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Problems solved by technology

[0005] However, most of the saline-alkali soil amendment materials at home and abroad are mainly inorganic materials, and CaSO 4 , CaCl 2 , CaS 5 After the materials are applied to the soil, the active exchange ions provided are relatively small due to factors such as the degree of hydrolysis. Moreover, after the inorganic amendment is applied to the soil at one time, it can only reduce the alkalization degree in a short period of time. , in a long period of agricultural planting, it is easy to cause harm such as anti-salt and anti-alkali, and lacks long-term effect