Diammonium Phosphate(DAP)

1. Agricultural Planting Sector

• Core Compound Fertilizer: This is DAP's primary application. DAP contains approximately 18% nitrogen and 46% phosphorus (as P₂O₅), making it a high-concentration nitrogen-phosphorus binary compound fertilizer. It offers balanced nutrient release and high absorption and utilization rates, suitable for use as a base fertilizer or top dressing. It is applicable to various crops such as wheat, corn, rice, cotton, melons, fruits, and vegetables. It promotes root development, flower bud differentiation, and grain plumpness, and is particularly suitable for phosphorus-deficient soils and crops during critical phosphorus-demanding periods. It can also be used for chlorine-sensitive crops (such as tobacco and citrus).

• Raw Material for Compound Fertilizers: DAP is a core raw material for producing multi-element compound fertilizers and blended fertilizers. It can be formulated with urea, potassium chloride, potassium sulfate, etc., to create compound fertilizers with different nutrient ratios to meet the fertilization needs of different crops and soils.

• Seedling and Planting Substrates: In seedling substrates and hydroponics nutrient solutions, DAP can serve as a nitrogen and phosphorus nutrient source, providing balanced minerals for seedling growth and ensuring robust development. It can also be used in microbial fertilizer production, providing nutrients for functional strains and promoting their reproduction.

2. Industrial Production Fields

• Water Treatment Agents: DAP can be used as a water quality stabilizer in circulating cooling water systems. On one hand, it can adjust the pH value of the water and alleviate pipe corrosion; on the other hand, its phosphate ions can form complexes or slightly soluble precipitates with calcium and magnesium ions, inhibiting scale formation. It can also be used to assist in the removal of heavy metal ions in wastewater treatment.

• Flame Retardant Materials: DAP can be used alone or in combination with ammonium polyphosphate, aluminum hydroxide, etc., to prepare intumescent flame retardants for flame retardant treatment of materials such as plastics, coatings, wood, and paper. At high temperatures, DAP decomposes to produce ammonia and phosphoric acid. Ammonia can dilute flammable gases, and phosphoric acid can form a flame-retardant char layer, blocking oxygen and heat transfer, thus improving the fire resistance of the material.

• Electroplating and Surface Treatment: In the electroplating industry, DAP can be used as a complexing agent and buffer in processes such as nickel and zinc plating. It stabilizes the pH of the plating solution and complexes metal ions, preventing hydrolysis and precipitation, thus improving the uniformity, gloss, and adhesion of the coating. It can also be used in metal surface phosphating to enhance the bond between the metal substrate and the coating.

• Refractory Materials and Ceramics: DAP can be used as a binder for refractory materials and a flux in ceramic production. It improves the high-temperature stability of refractory materials and the density and smoothness of ceramic products. It is commonly used in the production of industrial refractory bricks, daily-use ceramics, and special ceramics.

3. Pharmaceutical and Biotechnology Fields

• Pharmaceutical Excipients: In pharmaceutical preparations, DAP can be used as a pH buffer to stabilize the acid-base environment of oral liquids and injections, extending the shelf life of drugs. Simultaneously, due to its nitrogen and phosphorus content, it can regulate the electrolyte balance of body fluids and can also be used as an auxiliary ingredient in electrolyte supplements.

• Biological Experimental Reagents: DAP is a common component in the preparation of phosphate buffer solutions. It can be combined with ammonium dihydrogen phosphate and other compounds to adjust the pH of the buffer system, maintaining acid-base stability in experiments such as enzymatic reactions, cell culture, and protein purification. It can also serve as a nitrogen and phosphorus nutrient source for microbial culture media, ensuring the growth and reproduction of microbial strains.

4. Other Special Applications

• Food Industry: Food-grade DAP can be used as a food additive in the production of baked goods such as bread and biscuits. It provides a phosphorus source for yeast growth, promotes dough fermentation, and improves the texture and taste of baked goods. It can also be used as a nutritional fortifier in some functional foods to supplement the nitrogen and phosphorus minerals needed by the human body.

• Fire Extinguishing Agent Raw Material: DAP can be used to prepare dry powder fire extinguishing agents, especially suitable for extinguishing fires involving flammable solids and liquids. Its decomposition products can cover the surface of burning materials, playing a role in suffocation and cooling.

• Water treatment and soil improvement: In soil improvement, DAP can be used to adjust the pH value of acidic soil (because its aqueous solution is weakly alkaline) while replenishing soil nitrogen and phosphorus nutrients and improving soil fertility; in wastewater denitrification and phosphorus removal processes, it can be added as a phosphorus source to assist in biological denitrification and phosphorus removal.