Preparation method of water retention type fertilizer

Abstract

The invention relates to a preparation method of a water retention type fertilizer. The preparation method comprises the following steps that: 50 to 80 weight parts of crylic acid is placed in a container, 350 weight parts of de-ionized water is added to be stirred uniformly, and potassium hydroxide is used for regulating the PH value so that the PH value of the system is about 7.0; 30 to 50 weight parts of dry natural sheep manure is weighed and is crushed into powder of 100 meshes; the prepared sheep manure powder is added into the solution, next, 60 to 90 weight parts of carbamide and 10 to 15 weight parts of diammonium phosphate are added to be stirred and dissolved, then, nitrogen gas is introduced for stirring for 30 minutes at a high speed; mixture is heated to 65 DEG C at the pressure being 0.03 to 0.05 Mpa, and the pasting is carried out for 20 minutes; and 1.0 weight part of potassium persulfate salt and 1.0 weight part of sodium sulfite are added to be stirred uniformly, 0.5 weight part of N,N'-methylene bisacrylamide is added, the polymerization is carried out when the temperature is 50 to 60 DEG C, the polymerization time is one hour, crosslinked polymeric products are obtained, and the final product is obtained after nutritional ingredients are supplemented. The preparation method has the beneficial effects that the water retention type fertilizer obtained through the method provided by the invention has good water retention performance and good biologic and chemical stability, meanwhile, the natural sheep manure is used as a base material, the effective nutritional ingredients of the sheep manure are reserved, the effective utilization of resources is widened, and the cost can be greatly reduced.

Description

[0001] technical field [0002] The invention belongs to the field of superabsorbent resins, and in particular relates to a method for preparing water-retaining fertilizers. [0003] Background technique [0004] my country is a large agricultural country, and agriculture is the foundation of the national economy and an irreplaceable primary industry. Modern agriculture is characterized by low input, high output, high efficiency and sustainable development. The closely related chemical fertilizer industry and water resource utilization are the important material basis for modern agricultural production and development. Chemical fertilizers play an important role in agricultural production. According to the estimates of the Food and Agriculture Organization of the United Nations (FAO), 55% of the increase in food production in developing countries comes from the role of chemical fertilizers. However, due to factors such as volatilization, loss, and infiltration, the curre...

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