Method for preparing environment-friendly and multi-functional agro-forestry super absorbent polymer

Abstract

The invention discloses a method for preparing an environment-friendly and multi-functional agro-forestry super absorbent polymer, belonging to the field of preparation of agro-forestry superabsorbent polymers. The method sequentially comprises the following steps: (1) carrying out a neutral reaction, namely adding water into pregelatinized starch and stirring for 15-30 minutes to prepare gelatinized liquid, slowly adding potassium hydroxide and diammonium hydrogen phosphate, or ammonia water and dipotassium phosphate, or diammonium hydrogen phosphate and dipotassium phosphate for dissolving, slowly adding acrylic acid for neutralizing, and finally adding a cross-linking agent for uniformly mixing; (2) performing irradiation polymerization, namely separately packaging the neutralization solution into a polymerization container, and performing irradiation polymerization in an irradiation chamber, wherein the total irradiation dose is 3-15kGy; (3) drying, namely mincing gel blocks, and drying; and (4) crushing, namely crushing in a crusher, screening, thereby obtaining the agro-forestry absorbent polymer. The method disclosed by the invention is a method for preparing an energy-saving and environment-friendlyagro-forestry super absorbent polymer, and the prepared agro-forestry superabsorbent polymer has effects of preserving moisture and fertility, supplying plant nutrition and promoting growth.

Description

technical field [0001] The invention belongs to the field of preparation of agricultural and forestry water-retaining agents. Background technique [0002] Agriculture and forestry water-retaining agent is a kind of super-absorbent resin. Different from traditional water-absorbing materials, it not only has high water absorption, but also has good water retention. It can quickly absorb hundreds or even thousands of times its own weight Watery and gel-like. Mixing the water-retaining agent with the cultivation soil in a certain proportion can improve the soil aggregate structure, improve the water retention and air permeability of the soil, reduce the temperature difference between day and night of the soil, adjust the dryness and humidity of the soil, reduce the frequency of irrigation, and achieve the improvement of poor-quality soil and drought resistance. the goal of. The development and research of superabsorbent resin has only a few decades of history. The earliest co...

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Problems solved by technology

[0003] Most of the superabsorbent resins in the prior art are synthesized and produced with acrylic acid as the main raw material. Usually, compounds such as potassium persulfate, ammonium persulfate, ammonium cerium nitrate, and sodium bisulfate are used as initiators. The process is complicated, and the polymerization process requires heating and heat preservation. The initiator remains in the resin and cannot be removed, causing certain pollution. The heating and heat preservation process consumes energy and increases the cost in industrial production; the free radicals generated by chemical initiators are limited, and the oxygen in the air consumes free radicals, so during the polymerization reaction It needs to be protected by nitrogen gas, and the reaction device needs to be equipped with nitrogen adding equipment and needs to be airtight, and the equipment is more complicated

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