29 results about "Urea phosphate" patented technology

This invention discloses a method for improving the yield of urea phosphate in the preparation of wet-process phosphoric acid. The method involves mixing a crystallizer with wet-process phosphoric acid and urea, reacting the mixture, and then cooling, crystallizing, filtering, and drying to obtain urea phosphate. Alternatively, wet-process phosphoric acid is mixed with urea and reacted. After the reaction, a crystallizer or a urea phosphate mother liquor containing the crystallizer is added, followed by cooling, crystallizing, filtering, and drying to obtain urea phosphate. The crystallizer is one or a mixture of two or more of ethylene glycol methyl ether, ethylenediaminetetraacetic acid, and citric acid in any proportion. The urea phosphate produced by this method is in crystalline form, meeting the industrial urea phosphate standard (GB / T27805-2011), satisfying market demand, and featuring a low-cost crystallizer with flexible addition methods, making it very convenient for practical production.

The application discloses a compound fertilizer for promoting cotton high yield and a preparation method thereof, relates to the technical field of cotton fertilizer, and comprises first mother liquor A, second mother liquor B and third mother liquor C which are prepared, stored and packaged separately; the first mother liquor A contains urea phosphate, monoammonium phosphate, anhydrous citric acid, malic acid and manganese sulfate monohydrate; the second mother liquor B contains commercial 11-37-0 liquid ammonium polyphosphate, ammonium salt type polyaspartic acid solution, purified fulvic acid clear liquid and tri-potassium citrate; and the third mother liquor C is a mixed system of polyol complex state boron clear pre-liquid and medium complex state zinc pre-liquid. The application can improve the effective state stability of phosphorus, zinc and boron, reduce the risks of precipitation fouling and dripping head blockage, alleviate the risks of local salt peak and root injury in the seedling stage, promote the uniform emergence and young root growth of cotton, and improve the yield.

The invention relates to the technical field of urea phosphate production, and particularly provides an anti-foaming digital twinning optimization method for urea phosphate production. Multi-modal monitoring data such as reaction parameters, equipment states and environmental conditions are collected by deploying distributed edge computing nodes; performing feature extraction on the data to generate an initial anti-bubbling feature vector; a dynamic interaction topological structure is constructed in combination with material flowing and equipment operation states, and a comprehensive anti-foaming feature matrix is generated through graph neural network modeling; carrying out attention mechanism fusion on the matrix and the environment state feature vector to obtain an anti-foaming association intensity index; when the index exceeds a threshold value, generating an early warning signal through machine learning classification; and encrypting the data log by using the block chain to generate an audit record, verifying the path integrity, and outputting a final evaluation result. According to the invention, full-process intelligent anti-foaming management and control are realized, and the early warning accuracy, the real-time performance and the system adaptability are effectively improved.

This invention relates to the field of agricultural fertilizer technology and discloses a urea phosphate fertilizer specifically for improving saline-alkali soil. The raw materials, by weight, include: 81.0-84.0 parts urea phosphate, 1.5-2.0 parts polyepoxysuccinic acid, 4.0-6.0 parts magnesium sulfate heptahydrate, 8.0-12.0 parts water-soluble short-chain ammonium polyphosphate, and 0.5-1.0 parts hydrophobic fumed silica. Specifically, the polyepoxysuccinic acid coordinates with the magnesium ions dissociated from magnesium sulfate heptahydrate, and the hydrophobic fumed silica coats and embeds itself on the fertilizer surface. Through this fertilizer system, the magnesium polyepoxysuccinate complex preferentially undergoes cation exchange with free calcium in the soil, interrupting the formation pathway of insoluble phosphate precipitation, preventing phosphorus from solidifying and passivating in saline-alkali soil, and releasing magnesium ions to supplement crop nutrition. Simultaneously, the hydrophobic fumed silica on the surface blocks environmental moisture penetration, solving the problem of urea phosphate hygroscopic clumping, and hydrolyzes and desorbs after application to slightly alkaline soil.

The invention discloses a high-purity fully-water-soluble potassium sulfate fertilizer and a preparation method thereof, and belongs to the technical field of potassium sulfate fertilizers. The high-purity fully water-soluble potassium sulfate fertilizer is prepared from the following components in parts by weight: 960 to 980 parts of industrial grade potassium sulfate, 10 to 20 parts of urea phosphate, 5 to 15 parts of potassium nitrate, 1 to 3 parts of sodium hexametaphosphate, 0.5 to 1.5 parts of sodium cocoyl glutamate and 1 to 5 parts of citric acid-polyethylene glycol modified polyaspartic acid. The common problems of dissolution retardation and pseudo saturation of the traditional potassium sulfate fertilizer in low-temperature cold water are effectively eliminated.

The invention discloses an acrylic bathtub material, a preparation method thereof and a bathtub, the acrylic bathtub material comprises an acrylic base material and a fiber reinforced resin layer, the acrylic base material comprises methyl methacrylate, hydroxyl-containing (methyl) acrylate, phosphate-containing (methyl) acrylate and an initiator; the fiber reinforced resin layer comprises fiber reinforced resin, a filler, glass fibers, a curing agent and an accelerant; the fiber reinforced resin comprises an NCO-terminated urethane methacrylate monomer, unsaturated polyester and a diluting monomer. According to the invention, an acrylate monomer with phosphate groups and hydroxyl groups is copolymerized with methyl methacrylate to obtain an acrylic base material with a large number of phosphate groups and hydroxyl groups on the surface, and the acrylic base material and NCO groups of fiber reinforced resin can form chemical bond structures such as urea phosphate and amino methyl ester groups; the fiber reinforced resin layer and the acrylic base material are tightly anchored together, so that the hydrolysis resistance is better, and the flame retardance of the material is improved.

The invention belongs to the technical field of high-temperature well fracturing materials, and relates to a slow-release acid for fracturing by utilizing phase state slow release and a preparation method thereof. The preparation method comprises the following steps: preparing urea phosphate crystals; in the preparation process of the water-based gel, urea is added and uniformly stirred, and the urea water-based fracturing fluid is prepared; and mixing the urea phosphate crystal and the urea water-based fracturing fluid to obtain the slow-release acid for fracturing. In the dissolving process, dissociation balance of urea phosphate crystals moves reversely due to the existence of excessive urea, the solubility of urea phosphate is reduced, the concentration of phosphoric acid dissociated from the solution is reduced, and the corrosion inhibition effect is achieved. In a high-temperature stratum, urea is subjected to a polymerization reaction, the concentration of urea in a solution is reduced, dissociation balance moves forwards, the solubility of a urea phosphate solid is increased, and the concentration of phosphoric acid dissociated from the solution is increased; and the ionization balance of phosphoric acid is promoted to proceed forward by the temperature rise, and the hydrogen ion concentration in the solution is increased, so that the acidity of the fracturing fluid is accurately controlled.

The present application relates to a kind of compound preparation for improving the function of cattle and sheep rumen, and 100ml compound preparation is mainly made of the following weight ratio of raw materials: gentian 3-5g, giant knotweed 3-5g, cardamom 3-5g, peilan 3-5g, log 1-2g, cypress seed 3-5g, orange peel 3-5g, sea buckthorn 3-5g, carvacol 5-7g, urea phosphate 10-15g, sodium chloride 3-5g.The present application compound preparation is aimed at the characteristics of ruminant, adjusts rumen function, promotes nutrient absorption, and improves production performance;The present application compound preparation is easily absorbed after entering the body, and clinical administration is convenient, suitable for group administration, saves manpower and material resources.

The invention provides water-soluble ammonium polyphosphate synthesized by using urea phosphate mother liquor through microwave polymerization and a synthesis method and application thereof, and the synthesis method comprises the following steps: sequentially carrying out vacuum concentration dehydration, drying and crushing treatment on the urea phosphate mother liquor without an insoluble phosphate precipitation phenomenon to obtain urea phosphate concentrated powder; mixing the urea phosphate concentrated powder with urea, then putting the mixture into a microwave reactor, and reacting for 3-9 minutes in an open environment under the condition that the microwave power is 140-980W, so as to obtain the water-soluble ammonium polyphosphate. The water-soluble ammonium polyphosphate contains 3%-5% by mass of chelated medium trace elements, the content of water insoluble substances is less than 0.21%, the polymerization rate is 91%-96%, the average polymerization degree is 3.83-3.88, and the water-soluble ammonium polyphosphate can be used as a water-soluble slow-release fertilizer. According to the method, the newly produced urea phosphate mother liquor can be directly used as a raw material, and high-value utilization of low-grade resources is realized.

The application discloses a preparation method of compound fertilizer by sulfur phosphorus urea process, and belongs to the technical field of compound fertilizer.The preparation method of the compound fertilizer by the sulfur phosphorus urea process comprises the following steps: first, mixing and reacting equal-molar-ratio phosphoric acid and urea, inputting the mixture into a buffer tank and then into a tubular reactor, and inputting concentrated sulfuric acid into the tubular reactor; then, spraying the mixed slurry on a granulator bed while inputting ammonia gas, and sequentially performing processes such as drying, screening, cooling, film coating and packaging to obtain urea phosphate compound fertilizer.The process integrates the synthesis of urea phosphate, acidification reaction and neutralization granulation in a continuous flow, shortens the process flow, improves the production efficiency, increases the compound fertilizer yield by more than 10%, and stably supplies nutrients for a long time.Through the preparation method, the granulation effect is more stable, the product has a compressive strength of more than 30N, is not easy to cake, and the chemical reaction heat is used to drive the process, so that energy consumption is significantly reduced.

The invention relates to the technical field of soil improvement, in particular to a composite modifier suitable for sticky saline-alkali soil in coastal areas in South China and a three-dimensional quick-effect improvement method.The composite modifier is prepared from, by weight, 30-50 parts of sugar refinery filter mud, 20-40 parts of decomposed cassava residues, 10-20 parts of vinegar residues, 3-5 parts of urea phosphate and 0.1-0.5 part of fungicide. Compared with the prior art, the invention provides a new scheme for improving the sticky saline-alkali soil in the coastal area of south China by preferably selecting the components of the composite modifier and the components of the microbial agent with the best phosphorus and potassium dissolving capacity and combining a three-dimensional quick-effect improvement method, the pH value of the improved sticky saline-alkali soil is about 7.5, the total salt content is reduced to about 0.25%, and the soil quality is improved. The total porosity of the soil is remarkably improved by 60% or above, the content of rapidly available potassium and rapidly available phosphorus is improved, the emergence rate of sea rice planted on the land is 85% or above, and the growth condition is good.

The application provides a sunflower planting method in moderate and severe soda saline-alkali land, and belongs to the technical field of saline-alkali land improvement and crop planting. The sunflower planting method in moderate and severe soda saline-alkali land provided by the application comprises the following steps: uniformly mixing desulfurized gypsum, biochar and lignite, and throwing and spreading the mixture to the ground surface to uniformly mix the mixture with soil; ditching and ridging, laying drip irrigation belts and black degradable mulching films in the ditch and the ridge; after mulching, washing salt through drip irrigation, and applying urea phosphate through drip irrigation; and after washing salt, planting sunflowers through holes in the mulching film. The planting method reduces salt ion toxicity in the root zone of sunflowers, increases the content of soil organic matter, improves the emergence rate of sunflowers, speeds up the growth speed, and achieves the purpose of increasing yield and economic benefits.

The invention relates to the technical field of chemical production, and aims to provide a method for producing 64% powdery monoammonium phosphate by using urea phosphate mother liquor and strong phosphoric acid, which comprises the following steps: directly reacting gas ammonia and mixed acid in a reaction chamber, atomizing and spraying reaction slurry through a special spraying pipe, and drying and dehydrating in a drying tower to finally produce 64% powdery monoammonium phosphate. The production advantage of the tubular reactor is fully utilized, the limitation that dilute phosphoric acid is adopted for traditional production of 64% powdery monoammonium phosphate is changed, and the defects that the dilute phosphoric acid needs to be pretreated and purified in traditional production of 64% powdery monoammonium phosphate, the technological process is complex, energy consumption is high, and more equipment is used are overcome; meanwhile, waste urea phosphate mother liquor which is generated in urea phosphate production and is difficult to treat can be treated, the technological process is shortened, the number of production equipment is reduced, energy consumption is reduced, and the purposes of saving energy and reducing consumption are achieved.

The invention discloses a composite conditioning agent for improving a soil environment and a preparation method of the composite conditioning agent, and belongs to the technical field of poultry manure treatment and soil environment conditioning agent preparation. Comprising the following steps: inoculating bacillus subtilis into a special liquid culture medium, and carrying out staged heating culture to obtain a high-temperature-resistant bacteria solution; mixing the high-temperature-resistant bacterial liquid, poloxamer, L-histidine and a 1M Tris-HCl buffer solution to obtain a saline-alkali-resistant and high-temperature-resistant bacterial agent; a salt-resistant potassium agriculture and forestry water-retaining agent is modified and then is mixed with a salt-alkali-resistant high-temperature-resistant microbial agent to obtain a special bacterial fertilizer; mixing sheep manure, mineral source potassium fulvate, urea phosphate, polyaspartic acid, calcium magnesium phosphate fertilizer and special bacterial fertilizer to obtain a compound; and performing staged high-temperature fermentation on the compound to obtain the composite regulator. The saline-alkali resistance and high temperature resistance of the bacillus subtilis in the composite conditioning agent are improved, and the soil environment improving effect of the composite conditioning agent is further improved.

The invention discloses a preparation method and application of a synergistic liquid ammonium phosphate fertilizer containing polymeric amino acid, and belongs to the field of liquid fertilizers, the preparation method comprises the following steps: S1, preparing a synergist containing polymeric amino acid, S2, preparing a basic liquid fertilizer, S3, compounding the synergist and the basic liquid fertilizer, and S4, compounding an organic-inorganic composite liquid fertilizer. In the step S1, polyaspartic acid is subjected to ring opening to prepare a polysuccinimide intermediate, then piperidine acid is grafted, the polysuccinimide intermediate is crosslinked with polyglutamic acid and gamma-aminobutyric acid, thiohydantoin is loaded, and the pH response type organic gel synergist is prepared; s2, polymerizing phosphoric acid and urea to generate a urea polyphosphate intermediate, and ammonifying to prepare an ammonium polyphosphate basic liquid fertilizer; according to the invention, two industrial technical bottlenecks of mutual exclusion contradiction between long-acting slow release and suspension stability and difficulty in coordination of organic-inorganic component release kinetics are broken through, and a new three-dimensional gel fertilizer normal form with mechanical stability, environmental response intelligence and biological activity coordination is provided for a drip irrigation system.

The application belongs to the technical field of phosphorus chemical industry, and provides a preparation method of high-purity urea phosphate. The preparation method comprises the following steps: (1) preheating wet-process phosphoric acid, preparing urea aqueous solution and preheating, and preparing calcium hydroxide suspension; (2) adding the calcium hydroxide suspension into the wet-process phosphoric acid drop by drop, keeping the pH of the system at 0.8-1.8, and generating calcium phosphate nanocrystals in situ; (3) adding the urea aqueous solution into the calcium phosphate nanocrystals for reaction, simultaneously starting the nanofiltration membrane system for online circulation impurity removal, and obtaining a reaction liquid; (4) constant-temperature static setting crystallization of the reaction liquid; and (5) separation, washing and drying to obtain the high-purity urea phosphate. The preparation method uses the wet-process phosphoric acid as a raw material, realizes one-step high-purity crystallization through acid in-situ calcium phosphate nanocrystal induction and reaction-nanofiltration collaborative impurity removal, and has no organic additive residue; the high-purity urea phosphate with super-high purity, regular crystal form and extremely low impurities can be prepared, and is suitable for high-end application scenarios.

A method for synthesizing fluorescent carbon quantum dots (CQDs) and nitrogen-phosphorus co-doped fluorescent CQDs and applications are provided. Firstly, a mixture of leaf powder and deionized water is subjected to hydrothermal reaction at 200-240° C. to obtain a product A, followed by removing by-products in it and drying to obtain fluorescent CQDs; nitrogen-phosphorus co-doped fluorescent CQDs are obtained by replacing the product A with a product B and treating the product B in a same way as the product A, where product B is obtained as follows: a mixed system of leaf powder, urea phosphate and deionized water is subjected to hydrothermal reaction at 200-240° C. with a mass ratio of urea phosphate to leaf powder as less than or equal to 0.2 to obtain the product B.

A type of N,P modified Ti3C2T x The preparation method and application of electrode materials relate to the field of lithium-ion battery anode materials. The preparation steps are as follows: 1) Prepare Ti3C2T x The material was uniformly dispersed in deionized water, and then ultrasonically purified to obtain a homogeneous Ti3C2T. x 1) Dispersion; 2) Add N and P compound solution to the dispersion and stir to mix; 3) Pour the mixture obtained in 2) into the liner of a polytetrafluoroethylene reactor and carry out a solvothermal reaction. After cooling, wash the obtained sample with deionized water by centrifugation and vacuum drying to obtain N,P@Ti3C2T x Materials. This method uses one of urea phosphate, aminotrimethylene phosphonic acid, or N-bis(phosphohydroxymethyl)glycine as the N and P source, and employs a solvothermal method in Ti3C2T x The construction of N and P functional groups on the material surface effectively modulates the surface charge distribution, accelerates carrier transport and diffusion at the material interface, stabilizes the material structure, improves lithium-ion diffusion performance, and promotes the development of Ti3C2T. x Application of materials in lithium-ion battery anodes.

The invention discloses a defoaming agent adding method based on foam visual inspection, and belongs to the technical field of urea phosphate production. According to the method, the foam visual data acquisition module acquires foam images in a reaction kettle in real time, and the foam feature extraction and analysis module extracts feature parameters such as foam height, coverage area, particle size distribution, flow velocity and stability index based on an artificial intelligence algorithm; and in combination with process data such as temperature, pressure, liquid level and the like acquired by the production process parameter monitoring module, the defoaming agent adding strategy generation module dynamically generates an optimal strategy of the type, the adding amount, the opportunity and the rate of the defoaming agent by utilizing a reinforcement learning model, and accurate adding is realized through the defoaming agent accurate adding module. The data management and optimization module stores data and continuously optimizes the model, and the man-machine interaction and early warning module provides real-time monitoring and abnormal early warning. According to the invention, intelligent, accurate and self-adaptive addition of the defoaming agent is realized, consumption of the defoaming agent is effectively reduced, and production efficiency and safety are improved.

The invention relates to the technical field of urea phosphate production, and particularly discloses an online viscosity sensing and regulating method for urea phosphate production. The method comprises the following steps: S1, collecting characteristic samples of each production stage according to different production stages of urea phosphate, and carrying out viscosity sensing analysis treatment on the characteristic samples; s2, corresponding regulation and control measures are carried out on corresponding production stages of urea phosphate according to the viscosity sensing analysis processing result of the characteristic sample material; s3, after the regulation and control measures are executed, the characteristic sample materials of the corresponding production stages are collected again, and the viscosity sensing analysis processing is repeated to judge whether the viscosity correlation parameters can be successfully matched with the normal viscosity interval or not; if matching fails, the step S2 is repeated; according to the method, the online detection equipment is arranged in stages to collect the characteristic sample materials in each production stage and obtain the corresponding viscosity related parameters, so that the viscosity related parameters in the whole process from raw material pretreatment to mother liquor circulation are accurately sensed, and a blind area of traditional management and control is effectively filled up.

The application discloses a high-purity full-water-soluble potassium sulfate fertilizer and a preparation method thereof, and belongs to the technical field of potassium sulfate fertilizers. The high-purity full-water-soluble potassium sulfate fertilizer is composed of the following components in parts by weight: 960-980 parts of industrial-grade potassium sulfate, 10-20 parts of urea phosphate, 5-15 parts of potassium nitrate, 1-3 parts of sodium hexametaphosphate, 0.5-1.5 parts of sodium cocoyl glutamate and 1-5 parts of citric acid-polyethylene glycol modified polyaspartic acid. The problems of slow dissolution and false saturation of traditional potassium sulfate fertilizers in low-temperature cold water are effectively eliminated.

The invention relates to the technical field of fertilizers, and particularly discloses an instant potassium sulfate fertilizer and a production process thereof. The self-made crystallized potassium sulfate is prepared by adopting a hot melting-cold crystallization process, and the process conditions of the hot melting-cold crystallization process are as follows: the hot melting temperature is 80-100 DEG C, the hot melting time is 10-15 minutes, the crystallization temperature is 20-30 DEG C, the crystallization time is 10-15 hours, the initial liquid-solid ratio is (4.0-5.0): 1, and the circulating liquid-solid ratio is (11.5-12.0): 1; based on the weight of the self-made crystal potassium sulfate, the auxiliary agent comprises 1-2% of sodium tripolyphosphate, 0.5-1% of urea phosphate and 1-5% of magnesium sulfate. The instant potassium sulfate fertilizer disclosed by the invention has the advantages of clear solution, no impurity and high dissolving speed after being dissolved, and the pH value can be increased compared with that of the existing instant potassium sulfate, so that the influence on plant growth caused by over-low pH value is avoided.

The application discloses a kind of high-strength flame-retardant shaving board, which is made of the following raw material components by weight: shavings 800-1200 parts, composite adhesive 50-200 parts. The composite adhesive is made of the following components by weight: modified soybean glue 20-80 parts, modified guar gum 20-80 parts, curing agent 5-20 parts, flame retardant 5-10 parts. The high-strength flame-retardant shaving board prepared by the application has high strength and good mechanical properties. The combination of modified soybean glue and modified guar gum in the adhesive component improves the internal glue bonding strength of the material. The combination of hydroxyethyl melamine and sodium tetraborate improves the static bending strength of the material. The combination of urea phosphate and halloysite nanotubes improves the flame retardant performance of the material.

The application discloses a growth promoter for improving the seedling emergence rate of cotton in saline-alkali soil, and the salt resistance of cotton seed germination is improved by using rapeseed euricin regulator and GABA permeation regulator; the stable agent formed by strong acid materials such as urea phosphate can quickly reduce the pH value and saline-alkali of the soil tillage layer; meanwhile, the urea phosphate, amino acid, fulvic acid and auxiliary materials provide certain nutrient substances for seedling crops; the cooperation among raw materials fundamentally improves the salt tolerance of cotton seedling, not only improves the seedling emergence rate of cotton, but also can quickly reduce the pH value of saline-alkali soil in Xinjiang after dissolving water, improves the chemical composition of soil, reduces the salt content and alkalinity of soil, creates a good environment for crop growth, and after application, the soil salt content is below 20 g / kg, the pH value is below 7.5, the seedling emergence rate of cotton is above 70%, which is more than 30% higher than that of the control, and the yield of cotton in saline-alkali soil in Xinjiang is significantly increased, thereby providing technical support for rural revitalization.

The invention relates to the technical field of agricultural production, and particularly discloses a fertilizing method for promoting plant growth and increasing the phosphate fertilizer utilization rate. According to the method, specific phosphorus sources are applied in stages in a plurality of key growth periods such as 8-leaf expansion, 11-leaf expansion, 17-leaf expansion, a spinning period and a post-spinning period of corn, a fertilizer combination of a nitrogen fertilizer and a potassium fertilizer is matched, and the phosphorus sources are ammonium polyphosphate, monoammonium phosphate, urea phosphate, monopotassium phosphate or acidic potassium phosphate. The fertilizing method provided by the invention can effectively improve the morphological indexes of leaf area, stem diameter, plant height and the like of corn plants, and meanwhile, the total phosphorus content of each organ of the plants is remarkably improved, so that the synergistic improvement of crop growth and phosphate fertilizer utilization rate is realized.

The invention discloses a systematic alkali-resistant salt-resistant compound fertilizer, and belongs to the technical field of biological fertilizers. The alkali-resistant salt-resistant compound fertilizer is prepared from the following raw materials in parts by weight: 15 to 25 parts of urea phosphate mother liquor, 5 to 10 parts of urea nitrate, 0.7 to 1.5 parts of stress-resistant synergist and 64 to 80 parts of auxiliary materials, wherein the stress-resistant synergist is prepared from gamma-aminobutyric acid, Ectoin, chlorella growth factors and Asian growth halophilic archaea. After the compound fertilizer is applied for 30 days, the pH and the conductivity of the saline-alkali soil are effectively reduced, and in addition, the stress resistance of crops is remarkably improved, specifically, plant growth is remarkably promoted, and the plant height and the stem diameter are increased; the antioxidant enzyme activity is obviously improved; the phytophthora capsici is effectively prevented and treated.

The invention discloses a remodelable polyguanidinium urea material based on guanidinium urea phosphate and a preparation method thereof. The remodelable poly guanidinium urea material based on guanidinium urea phosphate is obtained by curing guanidinium urea phosphate and a polyfunctional isocyanate compound which serve as monomers under the condition of no catalyst. The high-performance remodeled guanidyl urea material is prepared from guanidyl urea phosphate and polyfunctional isocyanate, on one hand, the guanidyl urea phosphate and isocyanate can form richer crosslinking sites structurally, and the generated polyurea material has higher crosslinking density; therefore, the mechanical property of the dynamic covalent polymer network is enhanced; on the other hand, the guanidyl urea phosphate has reaction activity lower than that of hindered urea and has curing temperature lower than that of aromatic guanidyl amino acid monomers, so that reaction controllability is achieved, and reaction energy consumption is reduced.

Fertilizers comprising a mixture containing calcium nitrate (Ca(NO3)2) and one or both of urea phosphate (H3PO4.CO(NH2)2) and urea diphosphate ((H3PO4)2.CO(NH2)2) are disclosed. Methods of making and using the fertilizers are also disclosed.

The invention belongs to the technical field of crop planting, and particularly relates to a compound agent suitable for saline-alkali soil cotton planting and application of the compound agent. The compound agent provided by the invention comprises the following components in parts by weight: 3-10 parts of urea, 40-70 parts of urea phosphate, 18-45 parts of potassium sulfate, 0.1-2 parts of diethyl aminoethyl hexanoate and 0.5-3 parts of compound sodium nitrophenolate. Compared with the prior art, the compound agent provided by the invention is applied along with water drop or coated, can promote cotton seedling strengthening and growth promotion in a dry-sowing and wet-out planting mode, improves flower bud differentiation quantity and root system dry matter quality, and solves the problems of slow growth and development of cotton in saline-alkali soil, and weak seedlings are not adversity-resistant.