Ureaformaldehyde modification method, modified ureaformaldehyde and application thereof

Abstract

The invention relates to the technical field of ureaformaldehyde for slow-release fertilizers, in particular to a ureaformaldehyde modification method, modified ureaformaldehyde and application thereof. According to the modification method, in the process of preparing the ureaformaldehyde through a mixed reaction of urea and a formaldehyde solution, an organic acid prepared through starch fermentation is employed for modification treatment, so that after the ureaformaldehyde is added to an organic fertilizer for preparing a slow-release fertilizer, the slow release effect of the ureaformaldehyde is better, and therefore growth requirements of crops are met, the amount of fertilizers required by the crops is reduced, and the yield is improved.

Description

Technical field [0001] The invention relates to the technical field of urea-formaldehyde for slow-release fertilizers, in particular to a urea-formaldehyde modification method, modified urea-formaldehyde and applications thereof. Background technique [0002] With the continuous development of technology, the shortcomings of traditional agricultural fertilizers have gradually become prominent, and agricultural fertilizers have begun to undergo earth-shaking changes, and a large number of new fertilizers have appeared. For example, in order to promote the rapid absorption of crops, water-soluble fertilizers and liquids are provided. Fertilizers, foliar fertilizers, etc.; and in the process of promoting the development of fertilizers absorbed by crops, the matching relationship between the release of fertilizer nutrients and crops has also been greatly developed, making the field of agricultural fertilizers appear Controlled-release fertilizers and slow-release fertilizers to achie...

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Problems solved by technology

[0003] However, in the process of continuous development of slow-release fertilizers and controlled-release fertilizers, their shortcomings have gradually been reflected, so that researchers for slow-release fertilizers and controlled-release fertilizers began to make some conclusions about the nutrient release effects of slow-release fertilizers and controlled-release fertilizers. In-depth research, and in the process of in-depth research, the requirements for the slow-release structure and controlled-release structure of slow-release fertilizers and controlled-release fertilizers are becoming more and more stringent. Therefore, it is necessary to look for excellent slow-release and controlled-release structure materials has developed rapidly

[0004] Urea-formaldehyde, due to its own advantages, makes a large number of technical documents use it as a raw material for slow-release and controlled-release structures, and has also achieved good results; for the utilization of urea-formaldehyde, it is generally used as a coating material , coated on the outside of the fertilizer granules, mixed with the fertilizer powder, and directly granulated; after the urea-formaldehyde is processed through the above-mentioned treatment method to obtain a slow-release fertilizer or controlled-release fertilizer, it can promote fertilization into the soil. The long-term release of nutrients can achieve the effect of slow release and controlled release; however, according to the research, it is found that the slow release cycle of urea formaldehyde slow release fertilizer is longer, making it difficult to fully release the nutrients during the growth of crops, especially In short-cycle crops, the effect of its utilization is not ideal, which leads to the limitation of the application range of urea-formaldehyde slow-release fertilizer, otherwise it will increase the cost of agricultural fertilizer and cause the consumption of nitrogen fertilizer resources

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