Urea-Agrochemical

Urea, also known as urea and carbonamide, is an organic compound composed of carbon, nitrogen, oxygen and hydrogen, and is a white crystal. One of the simplest organic compounds is the main nitrogen-containing end product of protein metabolism and breakdown in mammals and some fish. As a neutral fertilizer, urea is suitable for a variety of soils and plants. It is easy to preserve, easy to use, has little damage to the soil, is a chemical nitrogen fertilizer with a large amount of use, and is also the nitrogen fertilizer with the highest nitrogen content. In addition to the use of urea as fertilizer, urea is also widely used in other fields.

Urea is a high-concentration nitrogen fertilizer, a neutral quick-acting fertilizer, suitable for all crops and all soils, can be used as base fertilizer and top dressing, dry paddy fields can be applied. It can also be used to produce a variety of compound fertilizers. No harmful substances remain in the soil, and there are no adverse effects of long-term application. Urea in the granulation temperature is too high to produce a small amount of biuret, also known as diurea, which has an inhibitory effect on crops. China stipulates that the content of urea biuret for fertilizer should be less than 0.5%. When the biuret content exceeds 1%, it cannot be used as seed fertilizer, seedling fertilizer and foliar fertilizer, and the urea content in other application periods should not be too much or too concentrated. Urea is an organic nitrogen fertilizer, which can be absorbed and utilized by crops after being hydrolyzed into ammonium carbonate or ammonium bicarbonate after the urease action in the soil. Therefore, urea should be applied 4~8 days before the fertilizer period of the crop.

Urea-Industry

Because urea has excellent dissolving dye properties, mild reduction, oxidation resistance and excellent hygroscopicity, it is an excellent dye solvent, hygroscopic agent, viscose fiber extruder, resin finishing agent in the textile industry. 2. It has a brightening effect on chemical polishing of steel and stainless steel, and is used as a corrosion inhibitor in metal pickling, and is also used in the preparation of palladium activation liquid.3. Used as raw materials for the manufacture of urea-formaldehyde ester, polyurethane, melamine-formaldehyde resin, urea heating to 200 °C to generate solid trichloric acid (i.e. cyanuric acid). Derivatives of cyanuric acid trichloroisocyanuric acid, sodium dichloroisocyanate, tris(2-hydroxyethyl isocyanurate), tri(allyl) isocyanurate, tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanate, triglycidyl ether isocyanurate, melamine cyanurate complex, etc. have many important applications. The first two are new high-grade disinfection and bleaching agents, and the total production capacity of trichloroisocyanuric acid in the world exceeds 80,000 tons.4. Urea is the raw material of special plastics (such as: urea formaldehyde resin). 5. Animal husbandry can be used as feed for ruminants. 6. Salt that replaces antifreeze is sprinkled on the street, and the advantage is that the metal does not corrode. 7. Ingredients of certain shampoos and detergents. 8. The composition of the first aid refrigeration package, because the reaction of urea with water will absorb heat. 9. Vehicle urea treats the exhaust gases of diesel engines, engines and thermal power plants, especially to reduce nitrogen oxide. 10. Ingredients of teeth whitening products. 11. Important auxiliary agent in dyeing and printing. 12. Composition of environmentally friendly engine fuel. 13. Strengthen the smell of cigarettes.14. Ingredients of rain inducer (with salt). 15. It can be used as raw materials for the production of hydrazine hydrate, tetracycline, phenobarbital, caffeine, reduced brown BR, phthalocyanine B, phthalocyanine Bx, monosodium glutamate and other products. 16. Automotive urea is mainly used in diesel engines. The state stipulates that EFI diesel engine vehicles must add urea, because the exhaust emissions of diesel vehicles are relatively large, and adding urea can reduce the carbon oxides in the exhaust gas and reduce pollutant emissions, thereby making diesel vehicles more environmentally friendly. 17. Urea can also be used in foaming agents. Third, feed addition Rumen of ruminant livestock contains a large number of bacteria and ciliates. Because urea is a nitrogenous compound, after it enters the rumen, it is hydrolyzed by the urease produced by the bacteria in the rumen to produce ammonia and carbon dioxide, ammonia and starch in the feed are used by bacteria to synthesize bacterial protein, bacterial protein and crude protein of feed have the same effect, enter the true stomach and small intestine of ruminants and are digested and absorbed, can supplement the needs of animal protein. 4. Cosmetics Urea is a very useful moisturizing ingredient, it is found in the stratum corneum of the skin, and it is the main component of the skin's natural moisturizing factor NMF. For the skin, urea has the effect of moisturizing and softening the keratin, so it can also prevent the stratum corneum from clogging the pores, thereby improving the problem of acne. It is used to add moisturizing ingredients in masks, skin lotions, creams, hand creams and other products. The addition ratio is 3-5%. 5. Medical use To test for the presence of Helicobacter pylori, a carbon-14-breath test uses urea containing a carbon 14 or carbon 13 label. Because the urease of Helicobacter pylori uses urea to make ammonia to raise the pH of its surrounding stomach. The same principle can also be used to test similar bacteria living in the stomachs of animals. Non-surgical nails are used in occlusive dressings that contain 40% urea. 6. Laboratory application Urea is very effective at denaturing proteins, especially at destroying non-covalently bonded proteins. This feature can improve the solubility of certain proteins at concentrations up to 10 moles per volume. Urea can also be used to make urea nitrate