Properties of urea
Urea, also known as carbamide, carbamide and urea. Pure urea is white, tasteless, odorless, needle shaped or prismatic crystal, with a melting point of 132.7 â?? under normal pressure. It is hygroscopic, deliquescent, hydrolyzable, and weakly alkaline. It is made into compound fertilizer with acid fertilizer. Urea is an organic compound composed of carbon, nitrogen, oxygen and hydrogen. It is a white crystal. Urea is one of the simplest organic compounds. The most important use of urea is as fertilizer. Its nitrogen content is more than 46%. After being converted into ammonium carbonate in soil, urea is hydrolyzed and absorbed by plants. It is the nitrogen fertilizer with the highest nitrogen content at present.
Molecular formula of urea: CO (NH2) 2, molecular weight 60.06, density 1.335g/cm �³ï¼? The melting point is 132.7 â??. Soluble in water and alcohol, insoluble in ether and chloroform. It is slightly alkaline. It can react with acid to form salt. It has hydrolysis. Condensation reaction can be carried out at high temperature to produce biuret, triuret and cyanuric acid. Heat to 160 â?? and decompose to generate ammonia gas and turn into cyanic acid at the same time. Urea can be hydrolyzed into ammonia and carbon dioxide under the action of acid, alkali and enzyme (acid and alkali need to be heated). Unstable to heat, heat to 150 â??ï½? 160 â?? to deamination to biuret. Urea is easily soluble in water, 105g can be dissolved in 100ml water at 20 â??, and the aqueous solution shows neutral reaction. There are two kinds of urea products: crystalline urea is white acicular or prismatic crystal with strong hygroscopicity; Granular urea is a translucent particle with a particle size of 1~2mm, which has a smooth appearance and improved moisture absorption.
Urea is a physiologically neutral fertilizer, which does not leave any harmful substances in the soil and has no adverse effects after long-term application. However, a small amount of biuret, also known as biuret, will be produced when the temperature is too high during granulation, which has an inhibitory effect on crops. Urea is molecular before conversion and cannot be adsorbed by soil, so it should be prevented from being lost with water; The ammonia formed after conversion is also volatile, so urea should also be deeply covered with soil. Urea is the first synthetic organic substance and widely exists in nature, such as 0.4% urea in fresh human feces.
The new version of national standard GB/T2440-2017 for urea has been officially implemented since July 1, 2018. Compared with the replaced 2001 standard, certain adjustments have been made.
New standard GB/T2440-2017
CASå?·:57-13-6 Urea for vehicles, agricultural urea, urea N46ï¼?
When the temperature of urea is below 20 â?? and the relative humidity is below 70%, it will not only not absorb moisture, but also evaporate water and reduce its water content; When the temperature exceeds 20 â?? and the relative humidity is higher than 80%, it starts to absorb moisture, and becomes paste when it is serious. When the air is dried again, it will re agglomerate, which is only inferior to ammonium nitrate. When the urea aqueous solution is at 80 â??, hydrolysis and decomposition reactions will occur, forming ammonium carbamate, ammonia gas and carbon dioxide respectively. Under acid and alkaline conditions, urea will decompose faster when it is heated. Urea is easy to combine with straight chain carbohydrates to form crystalline additional compounds; It forms a variety of double salts with various inorganic compounds, such as Ca (NO3) 2 �· 4CO (NH2) 2, NH4Cl �· CO (NH2) 2, CaChemicalbookSO4 �· 4CO (NH2) 2, MgSO4 �· 4CO (NH2) 2 �· 3H2O, Mg (NO3) �· 4CO (NH2) 2 �· 2H2O, etc; It is easy to form urea phosphate, dicalcium phosphate and water with monocalcium phosphate, namely Ca (H2PO4) 2 �· H2O+CO (NH2) 2 â?? H3PO4 �· CO (NH2) 2+CaHPO4+H2O; With nitric acid, it is easy to form urea nitrate, CO (NH2) 2+HNO3 â?? CO (NH2) 2 �· HNO3, which combines and relaxes the two; It can combine with formaldehyde to form urea formaldehyde compounds (uric acid rubber shrinks), in which the higher proportion of formaldehyde is urea resin, and the lower proportion is slow-release (effective) urea.
Humic Acid Ball Granule other name Granule Humus, Humic Acid Ball, Humus Granule is a kind of high polymer heterogeneous aromatic materials contains hydroxyl, carboxyl, phenolic hydroxyl and other active groups with black or brown appearance. It has the functions of chelation, complexing, ion exchange, floc, dispersion and adhesion. It is non-toxic, odorless.
Humic Acid Ball Granule other name Granule Humus, Humic Acid Ball, Humus Granule is a kind of high polymer heterogeneous aromatic materials contains hydroxyl, carboxyl, phenolic hydroxyl and other active groups with black or brown appearance. It has the functions of chelation, complexing, ion exchange, floc, dispersion and adhesion. It is non-toxic, odorless.
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Ground brucite, natural magnesium hydroxide, we have our own brucite mine in China.
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Use in fertilizer
Brucite is used for magnesium fertilizer particles. Pure natural brucite ore after high temperature calcination, reduction, baking, unique process. Particles are rich in structural water and trace elements to improve crop absorption, regulate acid soil, supplement crop nutrition and improve quality.
The main component of brucite is magnesium hydroxide, which belongs to the slightly soluble mineral type alkaline magnesium fertilizer. On the one hand, the rate of release of available magnesium is slow, usually in the slow-acting form of magnesium fertilizer application, on the other hand, due to low solubility, little dripping loss.
Balanced fertilization with all nutrients: Soil testing formula, in addition to ammonia, phosphorus and potassium, at the same time contains a variety of microelements which fruits and vegetables need,reduce the yellow leaf, lobular, dehiscent fruit and other physiological diseases;
After application,the crops will grow healthily, the roots are developed, the stems will be strong, the seedlings are protected, the fruits and melons will become more fragrant, the vegetables are delicious,and the cold resistance and drought resistance of the crops are enhanced.
Wide range of applications: it is suitable for all kinds of soil and crops, especially suitable for chlorine sensitive and high sulphur-using crops such as fruits and vegetables, tea, etc.
GERMALL PLUS is a combination of Diazolidinyl Urea and IPBC pre-dissolved in Propylene Glycol for ease of use. This combination exhibits a synergistic preservative effect, which reduces the total active preservative level necessary; provides for complete, broad spectrum preservation against Gram-positive and Gram-negative bacteria, yeast, and mold.
Compatible with most cosmetic raw materials.
Can be used in a wide variety of leave-on and rinse-off personal care formulations for reliable preservation.
Recommended use levels in a finished formulation is 0.1-0.5%.
Add at 50�°C or below during the cool down stage of processing.
Every cosmetic formulation requires a specific preservative system to meet its individual needs. Therefore, every newly developed or modified product should be challenge tested to assure preservative efficacy.
Urea is one kind of neutral fertilizer, which can be used in long time without any harmful material in soil. Usually it can be used both for base and top dressing fertilizer in agriculture. urea contains prilled urea and granular urea .
Prilled urea : gas based and coal based ; coated and uncoated; agriculture and industry grade
Granular urea : Can be used in agriculture and producing BB fertilizer and sulfur coated urea.
UREA is a spherical white solid. It is an organic amide molecule containing 46% nitrogen in the form of amine groups. UREA is infinitely soluble in water and is suitable for use as an agricultural and forestry fertilizer as well as for industrial applications which require a high quality nitrogen source.
"Type: Food Additives
Origin: China
CAS No.: 7783-28-0
AUCO No.: 300
Packing: 25kg bag"
Items Standard
Main content (NH4) 2HPO4 99%
P2O5 Phosphorus Pentoxide 53%
Nitrogen, as N 20.8%
Moisture 0.1%
Heavy metals, as Pb 0.001%
SO4 0.5%
Arsenic, as As 0.0003%
Fluoride 10 ppm
Water insoluble 0.10%
PH (1% water solution) 7.8-8.2
Na2O 0.001%
K2O 0.01%
Density 20--40 mesh
Insoluble matter NIL
Any foreign particle NIL
Ethephon is a plant growth regulator, which has the physiological effects of plant hormones in enhancing emulsion secretion, accelerating maturation, shedding, senescence and promoting flowering. Under certain conditions, ethepene can not only release ethylene by itself, but also induce plants to produce ethylene. It is applied in the production of natural rubber, benzoin and raw lacquer, and has a significant effect of increasing production. Ethylene is utilized to promote early maturity of cotton, concentrate the production of cotton floss, increase the yield of cotton floss and improve the grade, which is conducive to the mechanization of cotton cultivation. It can also be used for ripening bananas and tomatoes, ripening early rice, yellowing of tobacco leaves, regulating the opening of pineapples, removing flowers from tea leaves, sex transformation of flowers in cucumbers and other gourds, killing the male stems of wheat, and coloring apples and citrus fruits, etc.
Fluorobenzoylurea insect growth regulator, belonging to chitosan polysaccharide enzyme inhibitor, inhibits the formation of chitosan. The purpose of pest control is achieved by controlling the normal molting and development of the larvae. It is particularly active against a variety of Lepidoptera pests and also has a good effect on the larvae of other whiteflies, Diptera, Hymenoptera and Coleoptera pests. However, it is ineffective against many parasitic insects, predatory insects and spiders. It is mainly used for vegetables, fruit trees, cotton, tea, etc. For example, during the peak hatching period of cabbage worms and small cabbage moths to the peak development period of 1st to 2nd instar larvae, spray with 5% emulsifiable concentrate at a dilution of 2000 to 4000 times. For the diamondback moth, beet armyworm and diamondback moth that have developed resistance to organophosphorus and pyrethrin, spray with 5% emulsifiable concentrate at a dilution of 1500 to 3000 times during the peak hatching period of eggs to the peak emergence period of 1st to 2nd instar larvae. For cotton bollworms and red bollworms during the peak incubation period of the second and third generations of eggs, spray 5% emulsifiable concentrate at a dilution of 1500 to 2000 times. The insecticidal effect can reach over 85% about 10 days after application.
It is used as a growth regulator for urea plants and has cytokinin activity. It is mainly used as a cotton defoliant, and can also be used for defoliation of apple trees, grapevines, hibiscus, and crops such as kidney beans, soybeans, and peanuts. It has a significant inhibitory effect, with a dosage of 0.3 to 3kg/hm2. If the dosage in the cotton field is 0.5kg/hm, apply the medicine when 50% to 60% of the cotton bolls are opened. Dilute the preparation into a 500L/hm �² water solution and spray it on the plants. The defoliation effect is 98%. It can also be used to control weeds such as barnyard grass, dogtooth grass, horsehair, foxtail grass, creeping ice grass and chickweed. The dosage is 3kg/hm2, and the control effect is nearly 100%.
Urea, known as carbamide, is an organic compound composed of carbon, nitrogen, oxygen, and hydrogen. One of the simplest organic compounds is the main nitrogen-containing end product of protein metabolism in mammals and certain fish species. It is also the nitrogen fertilizer with the highest nitrogen content.
Product Specification
Nitrogen:
46% min.
Moisture:
0.3% max.
Biuret:
1% max.
Granulation:
1 - 4 mm 90-94 % min.
Melting Point:
131-135 Degrees Celsius
Colour:
Pure White Prilled
Radiation:
Non - Radioactive
Free A mmonia:
160pxt ppm max.
Main: N-P-K
30% 40%, 45% 60%
10kg, 25kg, 40kg, 50kg bag.
Water Solubility 100%.
Water soluble fertilizer, depending on its characteristic of easy to dissolve, no sediment and easy to absorbed, is widely used in the production of seedling, pot flower, cut flower, vegetable, and fruit, especially in the planting of modern horticulture.
Balanced fertilization with all nutrients:Soil testing formula,phosphorus and potassium,at the same time contains a variety of microelements which fruits and vegetables need,reduce the yellow leaf,lobular,dehiscent fruit and other physiological diseases;After application,the crops will grow healthily, the roots are developed, the stems will be strong, the seedlings are protected, the fruits and melons will become more fragrant, the vegetables are delicious,and the cold resistance and drought resistance of the crops are enhanced.
Compound fertilizer refers to chemical fertilizers containing two or more nutrients. The compound fertilizer has the advantages of high nutrient content, less auxiliary components and good physical properties. It is very important for alanced fertilization, improving fertilizer utilization rate and promoting high yield and stable yield of crops.
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