Polynutrient anti-blocking synergy urea and preparation method

Abstract

The invention discloses polynutrient anti-blocking synergy urea which contains large particle urea and a film coating composition, wherein the film coating composition comprises the following components in proportion by weight: 60-95 magnesium sulfate, 2-15 polyacrylamide, 0.5-4 sodium carboxymethyl cellulose, 0.5-4 dodecyl benzene sulphonic acid, 378-1770 water, 5-15 compound sodium nitrophenolate and 5-15 alpha-pimacol; and the weight ratio of the film coating composition to the large particle urea is 1:100-500. The film coating composition forms a coating film on the surface of the large particle urea so as to have good effects of anti-caking and anti-chalking. The components of the polynutrient anti-blocking synergy urea mutually cooperate to ensure that the decomposition velocity of nitrogen is consistent with the demand for nitrogen of crops and can improve the utilization rate of the nitrogen in the urea, promote the growth of plants and meet the requirement on magnesium of the crops, thus the product is polynutrient anti-blocking high-efficiency urea which has simple process and low cost and is suitable for popularization.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to an anti-caking urea and a preparation method thereof. Background technique [0002] Nitrogen is generally deficient in farmland soil in my country, and the application of nitrogen fertilizer is one of the key measures to ensure high-yield, stable, high-quality, and efficient agriculture. At present, the main variety of nitrogen fertilizer in the world and in my country is urea. Urea has been recognized by consumers for its high concentration of effective nutrients, good performance, easy storage and transportation, and convenient use. However, domestic urea generally has agglomeration problems during transportation, storage and after application, which seriously affects product appearance and utilization rate. On the other hand, the nitrogen utilization rate of urea after application is relatively low. [0003] The agglomeration of urea is caused by the recrystallization process on t...

AI Technical Summary

Problems solved by technology

The main types of coated urea currently formed in China include coated urea, phosphogypsum coated urea and calcium magnesium phosphate coated urea. The amount is small and the cost is low, but most of its slow-release properties are too fast, which cannot match the nitrogen demand of crops. There is still a big gap between the production technology and Europe, the United States, Japan and other countries, and it has not been used on a large scale so far. in agricultural production