When Granular Fertilizer Binding Starch is used as the binder for granular fertilizer production, particles hardly crack under standardized process ratios and proper storage conditions. It delivers outstanding stability with far lower cracking risks than traditional inorganic binders. The core bonding mechanism lies in that starch absorbs water, swells and ruptures after hydrothermal gelatinization, forming highly viscous, tough colloidal reticular structures. These structures evenly wrap powdery raw materials including nitrogen‑phosphorus‑potassium components and organic matter, and fill micro‑pores inside particles. Loose powder materials are tightly integrated into solid wholes, yielding compact‑structured, reasonably‑tough particles with favorable deformation resistance.
In standardized production, as long as starch dosage (normally 2%‑5%), mixing uniformity, drying temperature and duration are well controlled, finished fertilizer particles achieve moderate hardness and smooth surfaces. Hardly any cracking, powder shedding or breakage takes place during ambient‑temperature dry storage, regular transportation and loading‑unloading. Compared with inorganic binders such as clay and talcum powder, Granular Fertilizer Binding Starch endows particles with prominent toughness advantages. Granules formed by inorganic binders are brittle and prone to dry cracking triggered by temperature‑humidity changes, whereas starch colloidal structures can moderately buffer stress caused by thermal expansion and cold contraction.
Cracking of such fertilizer particles represents abnormal outcomes stemming from improper production or storage rather than inherent defects of Granular Fertilizer Binding Starch. Firstly, insufficient starch addition fails to build complete reticular bonding frameworks. Raw powders bond loosely with excessive internal voids, and cracks emerge as particles shrink after dehydration. Secondly, defective drying processes cause rapid moisture evaporation and surface hardening, while internal moisture evaporates slowly and generates tension. Uneven shrinkage between interior and exterior induces surface cracking.
Besides, harsh storage environments serve as another major cracking trigger. If fertilizer is kept in humid surroundings with drastic temperature swings for long periods, starch colloids undergo repeated water‑absorbing expansion and water‑losing contraction. Structural fatigue and aging will produce fine cracks. Moreover, direct sealing without sufficient post‑production cooling traps residual heat inside particles and sustains moisture dissipation, which further provokes cracks. By contrast, properly‑produced, dry‑sealed particles bonded with Granular Fertilizer Binding Starch retain intact shapes for a long time without cracking or damage, fully meeting basic requirements for fertilizer storage, transportation and application.
