Special magnesian clay crosslinking suspending agent for liquid fertilizer and preparation method thereof

Abstract

The invention belongs to the technical field of fertilizer production and specifically relates to a special magnesian clay crosslinking suspending agent for a liquid fertilizer and a preparation method thereof. The special magnesian clay crosslinking suspending agent for a liquid fertilizer is prepared from the following raw materials (by weight): 80-90 parts of magnesian clay, 2-8 parts of melamine, 0.01-0.2 part of a crosslinking adjuvant, 0.05-0.5 part of an initiator, and 0.1-0.8 part of a surfactant. Through high-temperature collision dispersion and quenching of the magnesian clay with high magnesium content, the magnesian clay becomes fluffy and light; and under the action of the crosslinking adjuvant, the magnesian clay and melamine are cross-linked to form a light porous magnesian clay crosslinking suspending agent. The suspending agent is used in a liquid fertilizer, can rapidly absorb water to be expanded to form gel and has good compatibility and stability in water. On one hand, a liquid fertilizer can be suspended due to the thickening effect; and on the other hand, the product will not settle and prevents segregability in water. Defects such as short suspension time and easy layering of traditional clay in a liquid suspension fertilizer are overcome.

Description

technical field [0001] The invention belongs to the technical field of fertilizer production, and in particular relates to a special magnesia clay cross-linked suspending agent for liquid fertilizer and a preparation method. Background technique [0002] Liquid fertilizer, also known as fluid fertilizer, commonly known as liquid fertilizer, is a liquid product of one or more nutrients required by crops, generally with the theme of N, P, K or one of the three major nutrients. Also often includes the need for micronutrients. The development of liquid fertilizers has a history of more than 200 years, and there are many varieties, which can be roughly divided into two categories: liquid nitrogen fertilizers and liquid compound fertilizers. Liquid nitrogen fertilizers include ammonium, nitrate and amide nitrogen, such as liquid ammonia, ammonia water, ammonium nitrate and ammonia, urea and ammonia, etc. Liquid compound fertilizer contains two or three nutrients in N, P and K, s...

AI Technical Summary

Problems solved by technology

The storage and transportation of liquid fertilizers must use specific containers and transportation vehicles, which are expensive and require the preparation of special application tools, etc.

At the same time, under the previous conditions, it is only suitable for on-site production and application, and the procurement cost is generally higher than that of solid fertilizers. Some products or mixtures may have salting-out or precipitation, which are all constraints on the development of liquid fertilizers.

[0004] In solving the layering problem of liquid fertilizers, the United States mainly adopts adding a part of colloidal clay minerals, such as bentonite, white clay, attapulgite, sepiolite, etc., with an amount of about 1% to 2%, and making the suspension at 28°C When the viscosity is controlled in the range of 300-700mPa·s, this method is applied to high-concentration liquid fertilizer and compound fertilizer for a short period of time, and the fertilizer must be used up in a short period of time (15 days), and stratified agglomeration will occur if it is placed for a long time; , mainly by adding high-viscosity and high-molecular-weight cellulose substances, such as the patent 200910192150.6 suspension type liquid compound fertilizer and its preparation method, adding 4-12% hydroxyethyl cellulose to increase the viscosity of the suspension. This method adds The proportion of cellulose is relatively large, and the cost is too high