Water-retaining fertilizer

Abstract

The invention relates to a water-retaining fertilizer, which is prepared by a method comprising the steps of: adding 50-80 parts by weight of acrylic acid in a container, adding 350 parts by weight of deionized water and mixing the mixture uniformly, and adjusting pH value with potassium hydroxide, wherein pH value of the system is adjusted to about 7.0; weighing 30-50 parts by weight of dried natural sheep manure and smashing the sheep manure into powder of 100 meshes; adding the prepared sheep manure powder to the solution, then adding 60-90 parts by weight of urea and 10-15 parts by weight of diammonium hydrogen phosphate, stirring to dissolve, then introducing nitrogen, and stirring at high speed for 30min; heating to 65 DEG C and gelatinizing for 20min under a pressure of 0.03-0.05Mpa; adding 1.0 part by weight of potassium persulfate and 1.0 part by weight of sodium sulfite, agitating uniformly and adding 0.5 parts of N, N'-methylene bisacrylamide, and polymerizing at 50-60 DEG C for 1 hour to obtain a crosslinked polymerized product; and adding nutritional ingredients to obtain the final product. According to the invention, the water-retaining fertilizer obtained by the method provided by the invention has good water-retaining performance and biological and chemical stability, and the natural sheep manure is used as a base material, the effective nutritional ingredients of sheep manure is maitained, the effective use of resources is increased and the cost is reduced to a great extent.

Description

[0001] Technical field [0002] The invention belongs to the field of super absorbent resins, and specifically relates to a water-retaining fertilizer. [0003] Background technique [0004] my country is a large agricultural country, and agriculture is the foundation of the national economy and the primary industry that cannot be replaced. Modern agriculture is characterized by low input, high output, high efficiency and sustainable development. The fertilizer industry and the utilization of water resources, which are closely related to this, are an important material basis for modern agricultural production and development. Chemical fertilizer occupies an important position in agricultural production. According to the United Nations Food and Agriculture Organization (FAO) estimates, 55% of the increase in food production in developing countries comes from the role of fertilizers. However, due to factors such as volatilization, loss and penetration, the current seasonal utiliza...

AI Technical Summary

Problems solved by technology

[0010] In agricultural applications, due to the high cost of superabsorbent resins, the application and promotion of superabsorbent resins have been seriously hindered. Many domestic scientists have done a lot of work in reducing the cost of superabsorbent resins, but most of the work is mainly concentrated on Add cheap materials such as bentonite, kaolin and attapulgite to the polymerization system to achieve the purpose of reducing costs. Although adding some inorganic minerals can improve the hydrogel strength of the water-retaining material after absorbing water, but the performance is high. The amount of resin soil added is low, which cannot fundamentally reduce the cost of raw materials

In addition, the product function only has the same water absorption and water release functions as ordinary water-absorbent resins, and lacks nutritional functions.

[0011] The invention patent application with the publication number CN101113119A discloses a water-retaining fertilizer and its preparation method. It is prepared by mixing a superabsorbent resin with a chelating agent. The chelating agent is used to provide some nutrients, and this method has no way to reduce The processing cost of superabsorbent resin, while adding various components to the finished product further increases the cost of manufacturing