Method for preparing super absorbent resin by graft copolymerization reaction of carboxymethyl potato starch, acrylamide, acrylic acid and sodium salt thereof

Abstract

The invention discloses a method for preparing super absorbent resin by the graft copolymerization reaction of carboxymethyl potato starch, acrylamide, acrylic acid and sodium salt thereof, which comprises the following main processes: carrying out neutralization reaction between a sodium hydroxide solution and acrylic acid from which polymerization inhibitor is removed under the cooling of ice-water bath; mixing acrylamide with de-ionized water to obtain an acrylamide solution; mixing the carboxymethyl potato starch with the prepared acrylic acid and the sodium salt solution and the acrylamide solution; adding an evocating agent persulfate and a cross-linking agent N,N'- methylene-bisacrylamide; stirring the mixture under room temperature; heating the mixture by water bath to rise the temperature so as to ensure that the carboxymethyl potato starch, the acrylic acid and the sodium salt thereof and the acrylamide generate graft copolymerization reaction under the protection of nitrogen; keeping the temperature of the reaction; drying and crashing to obtain the super absorbent resin with high potassium content by using carboxymethyl potato starch as the raw material. Compared with the similar products, the water absorption of the super absorbent resin is greatly enhanced; the super absorbent resin contains nitrogen nutrition element, does not need pasting in comparison with theprocess of directly using starch and greatly improves the preparation process. The super absorbent resin has great effect on the water conservation, the desert control, the plant growth promotion andthe like of soil in dry regions.

Description

technical field [0001] The invention relates to a method for preparing a superabsorbent resin used in fields such as agriculture, forestry, animal husbandry, horticulture, and desertification prevention and control, in particular to a method for preparing a superabsorbent resin with carboxymethyl potato starch, acrylic acid and acrylamide as main raw materials. Background technique [0002] The excellent water absorption and water retention properties of superabsorbent resin make it widely used in many fields. Adding superabsorbent resin to the soil can change the aggregate structure of the soil, increase the water permeability and air permeability of the soil, and store the added water, which is attractive in the aspects of soil moisture retention in arid areas and desert control. Prospects. At present, such products have been widely used in seed coating, desertification control, agriculture, forestry and horticulture and other fields, and their demand is growing at a high...

AI Technical Summary

Problems solved by technology

Although my country has achieved certain results in the research of superabsorbent resins, there are still many problems in the performance and variety of industrialized products, such as low water absorption of resins, poor salt resistance, and gel strength after water absorption. Low, complex production process, high product cost, etc., and there are not many researches on water absorption theory, water absorption performance and application. The varieties and quantities produced by industrial manufacturers are still relatively small, and there are many tasks that people need to do in depth

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