Rare earth element-rich coating material and preparation method and application thereof

Abstract

The invention discloses a rare earth element-rich coating material and its preparation method and application. The rare earth element-rich coating material comprises 100 parts of starch, cellulose, polyvinyl alcohol, a cross-linking agent, lanthanide rare earth and water, 20-30 parts of a compound modifier and 5-15 parts of a powder filler. The preparation method comprises the following steps: adding starch, cellulose, polyvinyl alcohol, lanthanide rare earth and water into a reaction vessel and stirring and mixing, heating to 60-80 DEG C for gelatinization, adding the cross-linking agent, keeping the temperature at 85-95 DEG C and reacting for 2-3 h to obtain an emulsion, adding the compound modifier and the powder filler in a corresponding proportion into the removed emulsion at room temperature, stirring and mixing uniformly to obtain the rare earth element-rich coating material. By adjusting composition of the coating material and ratio of the coating material and a granulated fertilizer, a slow and controlled release fertilizer with different release periods can be prepared. The slow and controlled release fertilizer is prepared according to the invention. Raw materials have a wide source and are cheap and easily available; and the preparation method is simple and is easy for industrial production.

Description

technical field [0001] The invention belongs to the technical field of materials and fertilizers, and in particular relates to a coating material rich in rare earth elements and its preparation method and application. Background technique [0002] The production and application of chemical fertilizers in my country rank first in the world, making great contributions to the grain production and security of the country and the world. However, there are some defects in chemical fertilizer itself and unreasonable application. The utilization rate of chemical fertilizer in our country is only about 30%. In order to increase the yield of crops, farmers often apply fertilizer twice or multiple times, which not only causes a lot of waste of resources, but also It has a negative impact on the ecological environment and has an adverse impact on the economic strategy of sustainable development. Therefore, the development of long-acting slow- and controlled-release fertilizers has beco...

AI Technical Summary

Problems solved by technology

However, chemical fertilizer itself has some defects and unreasonable application. In my country, the utilization rate of chemical fertilizer is only about 30%. In order to increase the yield of crops, farmers often apply fertilizer twice or more times, which not only causes a lot of waste of resources, but also It has a negative impact on the ecological environment and has an adverse impact on the economic strategy of sustainable development.