Adhesive for granular fertilizer and preparation method for adhesive

Abstract

The invention provides an adhesive for a granular fertilizer and a preparation method thereof. The adhesive comprises the following components in parts by weight: 35 to 45 parts of starch, 1 to 5 parts of phosphate, 0.1 to 3 parts of an oxidant, 0.1 to 1 part of a coupling agent and 40 to 60 parts of water. The preparation method comprises the following steps of: adding the water into the starch to be in a slurry state, rising the temperature to be at 40 to 60 DEG C, adjusting the pH value of a system to be at 8 to 11, adding 1 to 5 parts of the phosphate and 0.1 to 3 parts of the oxidant for reaction for 10 to 30min, adding 0.1 to 1 part of the coupling agent for reaction for 15 to 60min to obtain modified starch emulsion, performing pregelatinization reaction and drying on the modified starch emulsion by a double-roller dryer to obtain modified starch blocks, and grinding and screening to obtain the adhesive with certain granularity. The adhesive is used for preparing the granular fertilizer is high in adsorption activity, high in adhering force, high in granulation balling rate and low in return rate; obtained granules are high in intensity; and a phenomenon that the granular fertilizer is easy to smash during transportation can be solved.

Description

technical field [0001] The invention relates to a binder for granular fertilizer and a preparation method thereof, in particular to a modified starch binder for compound fertilizer and a preparation method thereof. Background technique [0002] At present, in view of the national conditions of my country's small land and large population and the long-term high-yield and low-efficiency situation of agricultural production, the state has proposed a new idea for the development of high-speed, high-efficiency and high-quality agriculture, which has opened the prelude to my country's transformation from traditional agriculture to modern agriculture. Modern agriculture is gradually turning to green agriculture and ecological agriculture. At the same time as the development of ecological agriculture, the proportion of chemical fertilizers in modern green ecological agriculture is increasing, and it is the leading factor in contemporary agriculture. The compound fertilizer has becom...

AI Technical Summary

Problems solved by technology

Clay mineral binders are commonly used in the production of compound fertilizers at present. The problems encountered are: 1. The raw material has poor bonding performance, and it is difficult to form granules during granulation; 2. Due to poor dispersion and uneven distribution, each grain is compounded The nutrient content of the fertilizer granules is different; 3. After drying, the clay on the surface of the fertilizer granules becomes powdery and easy to fall off, which not only reduces the production efficiency, but also seriously affects the qualified rate of the product; Breakage occurs, which increases the contact surface between particles and is easy to agglomerate; 5. The utilization rate of nitrogen, phosphorus, potassium and other nutrients is not high. Long-term use of this kind in large quantities will easily cause soil acidification and compaction, and reduce biological activity; 6. The use of clay as a binder reduces the content of active ingredients due to the increase in useless ingredients, which increases production energy consumption and transportation costs.

However, because the crosslinking agent used is boric acid, the degree of crosslinking of the modified starch is low, and the product's cohesiveness is not strong enough, so it can only be used as a binder for organic fertilizers. For inorganic compound fertilizers and inorganic organic compound fertilizers, it is Insufficient cohesiveness will lead to low granulation rate in the granulation process, easy loosening of granules in the drying process, and high return rate, resulting in low output and high energy consumption