25 results about "Coated urea" patented technology

The invention discloses a preparation method of an ethyl cellulose and isocyanate cross-linked coated urea slow-release fertilizer, and relates to a preparation method of a urea slow-release fertilizer. The invention aims to solve the problems that the existing nitrogen fertilizer is low in utilization rate and easy to absorb moisture and cake, a polyurethane coating material is non-degradable, and pure ethyl cellulose is insufficient in mechanical strength and limited in water resistance and is not beneficial to being used as a coating matrix of the fertilizer. The method comprises the following steps: 1, preparing an ethyl cellulose cross-linked isocyanate enveloping solution; and 2, preparing the ethyl cellulose and isocyanate cross-linked coated urea slow-release fertilizer. According to the preparation method, etherified derivative ethyl cellulose of cellulose is taken as a raw material, and the defects that a pure ethyl cellulose membrane is insufficient in mechanical strength, limited in water resistance and low in nutrient separation control precision are overcome by utilizing isocyanate crosslinking modification. The prepared slow-release fertilizer has the advantages of being simple in process, low in cost, environmentally friendly, degradable in matrix, capable of effectively preventing urea from absorbing moisture and caking and the like, and is suitable for large-scale preparation and used in agricultural production.

The invention relates to the technical field of microbial culture, in particular to a heterotrophic culture method of benthic diatom, which comprises the following steps: S1, adding benthic diatom into an improved SE culture medium, and culturing for 5-7 days until OD540 is 0.8-1.2 to obtain a benthic diatom seed solution; according to the method disclosed by the invention, a nutrition system is constructed by taking waste glycerol as a carbon source and sodium alginate coated urea as a slow-release nitrogen source, and the benthic diatom, nitrogen-fixing bacteria and phosphate solubilizing bacteria are co-cultured on a porous ceramic carrier to be cultured under a dark condition, so that compared with the prior art, the method disclosed by the invention thoroughly gets rid of the dependence on illumination, and the yield is increased. The rapid, high-yield and stable heterotrophic culture of the benthic diatom is realized, meanwhile, the raw material and energy consumption cost is greatly reduced, and the resource recycling rate is improved; the obtained diatom biomass can be used for aquatic bait, biological energy, environmental restoration and development of high-added-value products, and has a wide industrial application prospect.

The application discloses resin-coated urea slow-release fertilizer, a preparation method and application thereof, and first prepares resin-coated urea slow-release fertilizer, adopts polystyrene, polyethylene, talcum powder and starch mixture to be dispersed and heated in tetrachloroethylene to prepare coating liquid, then sprays the coating liquid on the surface of dried urea after pretreatment, and with evaporation of the solvent, a resin layer is formed on the particle, and the resin-coated urea slow-release fertilizer is obtained. The resin-coated urea can simulate atmospheric nitrogen deposition, and can more truly simulate the nitrogen deposition mode.

The invention discloses a special compound fertilizer for food crops as well as a preparation method and application thereof, and belongs to the technical field of organic and microbial fertilizers. The compound fertilizer comprises a basic fertilizer and an organic biological fertilizer source, wherein the basic fertilizer is prepared from sulfur coated urea, urea, calcium superphosphate, potassium chloride, sodium metasilicate and oyster shell powder; the organic biological fertilizer source is composed of a vinasse fermentation product, a microbial activity protective agent and lignosulfonate. The vinasse fermented product is prepared by carrying out three-stage solid state fermentation on vinasse by adopting a compound bacterium suspension consisting of mycobacillus halophilus and ocean sediment vesicular bacillus. Through synergistic fermentation of functional strains, compounding of a microbial active protective agent and introduction of a slow-release nitrogen source and stress-resistant components, synergistic interaction of efficient release of nutrients, soil improvement and improvement of crop stress resistance is realized. The compound fertilizer is suitable for grain crops such as wheat and rice, can remarkably improve root activity, yield and stress resistance, and has a wide application prospect.

The application discloses a starch-based coated slow-release urea and a preparation method thereof. The slow-release urea is composed of a core and a composite coating layer. The core is urea particles. The composite coating layer comprises a paraffin layer as an inner layer and a starch-based material layer as an outer layer. The mass of the paraffin layer accounts for 0.5-2% of the total mass of the slow-release urea. The total mass of the composite coating layer accounts for 4-10% of the total mass of the slow-release urea. The starch-based material layer is formed by cross-linking reaction of starch and / or modified starch and glutaraldehyde. The method is continuous, simple and low in cost. The coating material is biodegradable. The obtained product has good slow-release performance and moisture-proof stability. In addition, the outer layer film formed by chemical cross-linking has good mechanical strength and is combined firmly with the inner paraffin layer, so that the structural integrity of the coated urea during storage, transportation and application is ensured.

The invention belongs to the field of fertilizer and rice planting, and discloses a slow mixed fertilizer for improving the quality of rice in saline-alkali soil, which is prepared from the following components in parts by mass: 10-12 parts of urea, 21-25 parts of sulfur coated urea, 39-47 parts of 90-day resin coated urea, 14-22 parts of resin coated diammonium phosphate and 10 parts of resin coated potassium chloride. The slow-mixing fertilizer is applied at one time during paddy field soil preparation, and the nitrogen application amount is 65-80% of the local conventional nitrogen application amount. By optimizing the proportion of nitrogen, phosphorus and potassium and combination of slow-release materials, nutrient release is dynamically matched with fertilizer requirement in the key growth period of rice, nitrogen loss is remarkably reduced, the fertilizer utilization rate is increased, and the yield is stably increased; meanwhile, the processing quality, the appearance quality and the taste quality of the rice are improved; the nitrogen application amount is reduced to 65-80% of the conventional nitrogen application amount, the non-point source pollution risk is remarkably reduced, and both high-quality production and ecological protection are considered.

The invention discloses a slow-mixing fertilizer suitable for increasing yield and reducing emission of machine-transplanted early rice in a low-latitude region. The slow-mixing fertilizer is prepared from the following components in parts by mass: 4-6 parts of sulfur-coated urea and 4-6 parts of 2-month resin-coated urea. The invention further discloses application of the slow-mixing fertilizer in early rice production, fertilization and rice transplanting are synchronously carried out, and the slow-mixing fertilizer is directly applied to the position 5 cm away from the rhizosphere side of seedlings and the position 3-5 cm deep in soil. The slow-mixing fertilizer provided by the invention can improve yield and nitrogen fertilizer utilization efficiency and reduce greenhouse gas emission. Compared with the conventional high-yield fractional fertilization, the slow-mixing fertilizer disclosed by the invention has the advantages that by applying the slow-mixing fertilizer disclosed by the invention, the yield of rice is increased by 7.5%-7.8%, the nitrogen fertilizer utilization efficiency is increased by 30.5%-44.5%, meanwhile, the global temperature increasing potential is reduced by 12.8%-27.5%, and the greenhouse gas emission intensity is reduced by 19.3%-32.7%.

The invention discloses a preparation method of large-particle urea surface treatment liquid and application of the large-particle urea surface treatment liquid in polyurethane coating, and belongs to the technical field of chemical fertilizer industry. The large-particle urea surface treatment liquid is prepared from nano powder, a dispersing agent, a film-forming high polymer, a wetting agent, a defoaming agent and water. The large-particle urea for surface treatment is coated with polyurethane, so that the large-particle urea with high smoothness can be obtained under the conditions of high efficiency and low energy consumption. Tests show that the nitrogen nutrition accumulative release rate in 24 hours is 0.10-0.33%, the nitrogen nutrition accumulative release rate in 7 days is 3.59-5.02%, the nitrogen nutrition accumulative release rate in 28 days is 14.95-16.37%, the nitrogen nutrition accumulative release rate in 60 days is 30.46-32.09%, and the polyurethane coated urea is excellent in controlled release rate.

The application provides a coated urea production system, which comprises a coating liquid conveying system and a urea conveying system; the coating liquid conveying system comprises a coating liquid storage tank, a conveying pipeline and a spraying assembly arranged on the conveying pipeline which are sequentially connected; a coating power pump and a pressure adjusting system for controlling the spraying amount of the coating liquid are arranged on the conveying pipeline, the pressure adjusting system comprises the following control parameters: power air pressure 0.35-0.6 Mpa, pump outlet pressure 0.25-0.5 Mpa; the urea conveying system comprises a conveying belt and a stirring device arranged on the conveying belt, the modified urea has a core-shell structure, the inner core is urea particles, the intermediate coating layer is modified attapulgite and polyvinyl alcohol, and the outer shell is starch-acrylonitrile graft copolymer; the obtained urea has good coating effect, and the coating stability and the urea stability are both excellent, and the strength and the slow-release effect of the urea product are improved.

The invention relates to the technical field of agricultural organic fertilizers, and discloses a soil improvement efficient slow-release bio-organic fertilizer and a preparation method thereof.The soil improvement efficient slow-release bio-organic fertilizer is prepared from, by mass, 30%-38% of a slow-release matrix, 6%-8% of a biological functional fungicide, 18%-25% of a soil improvement auxiliary, 30% of a modified carrier framework and 6%-8% of a keep-alive and forming auxiliary, the slow-release matrix is formed by compounding calcium alginate microspheres and humic acid coated urea according to the mass ratio of (12-18): (18-20), the particle size of the calcium alginate microspheres is 100-150 microns, the crosslinking degree is 85%, and the embedding rate of nitrogen, phosphorus and potassium nutrients is larger than or equal to 90%; the nitrogen content of the humic acid coated urea is 46%, the slow release period is 90 days, and the coating thickness is 50 microns. The humic acid activated straw powder-peanut shell carbon composite carrier is adopted, the porosity is high, a survival microenvironment is provided for microorganisms, and soil salt and heavy metal can be adsorbed; and a keep-alive system of vitamin C and maltodextrin is matched, so that the attenuation rate of microorganisms stored for 120 days is reduced.

The application discloses a biodegradable coated urea added with zirconium-based MOF nanocrystals with phosphatase activity and a preparation method and application thereof, and belongs to the technical field of fertilizers. The zirconium-based MOF nanocrystals with phosphatase activity are prepared, a solution of the zirconium-based MOF nanocrystals is mixed with urea and dried, polypropylene carbonate is used as a coating material, and then the biodegradable coated urea added with the zirconium-based MOF nanocrystals with phosphatase activity is prepared through a fluidized bed solvent method. The coated urea prepared in the application can realize nitrogen control release, hydrolyze soil organic phosphorus through the phosphatase activity of the Zr-MOF nanocrystals, realize the dual functions of continuous supply of nitrogen and in-situ activation of soil phosphorus, simultaneously meet the demand of crops for two core nutrient elements of nitrogen and phosphorus, significantly relieve the low-phosphorus stress of crops, promote the growth of the root system and the aboveground part of crops, and improve the biomass of crops.

The invention provides bio-based polyurethane coated urea as well as a preparation method and application thereof. The bio-based polyurethane coated urea comprises urea and a coating material coating the surface of the urea, the coating material comprises bio-based polyurethane, and the bio-based polyurethane is prepared from bio-based polyol and an isocyanate compound, the bio-based polyol is a reaction product of a lactic acid prepolymer and epoxidized vegetable oil. The polyurethane coated urea has the advantages of being excellent in nitrogen fertilizer slow release effect, high in bio-based content, capable of being degraded by microorganisms, small in pollution, low in cost and the like.

The invention discloses anti-floating coated urea based on a water-soluble pigment and a preparation method of the anti-floating coated urea, and belongs to the technical field of slow-release fertilizers. Azone, dodecyl glucoside and polyvinyl alcohol are compounded to prepare a composite surfactant, then the composite surfactant is used for preparing the anti-floating coated urea based on the water-soluble pigment, and the anti-floating coated urea is specifically prepared from the following raw materials in parts by mass: 0.05-1 part of food-grade pigment, 0.5-5 parts of the composite surfactant, 900-1100 parts of urea and 5-20 parts of polyhydric alcohol. 5 to 20 parts of isocyanate; 5 to 20 parts of water; compared with the situation that the surfactant is not used or a single surfactant is used, the anti-floating capacity of the anti-floating coated urea is effectively enhanced. The anti-floating coated urea prepared by the invention is good in anti-floating property, controllable in nutrient release, good in environmental protection property and high in appearance identification degree, meets the development requirements of green and environment-friendly agriculture, and improves the market competitiveness of the product.

The application discloses a kind of fertilizer for rice planting and its preparation method, the fertilizer is the particle with the triple structure of core-shell-outer functional layer, including: core layer, by 35±2 parts of polyurethane coated urea is constituted;Intermediate layer, is covered outside the core layer, by 25±2 parts of sulfur-coated urea is constituted;Outer layer, is covered outside the intermediate layer, and total weight is 40±5 parts.The application realizes the programmed release of nutrient by the triple structure design of "core-shell-outer functional layer", and outer layer mineral source humic acid potassium, composite silicon source and the like are rapidly dissolved and released, stimulate seedling root and provide early resistance ability;Intermediate layer sulfur-coated urea is degraded in tillering to early jointing stage, releases nitrogen and sulfur element, accurately interfaces rice first nitrogen uptake peak, and sulfur element activates nitrogen metabolic enzyme, improves nitrogen assimilation efficiency;Core layer polyurethane coated urea continuously releases nitrogen in late jointing to milk stage, effectively prevents late period from losing fertilizer.

The invention belongs to the technical field of feed industrial quality detection and analytical chemistry, and provides a rapid detection method for the urea content of coated urea for feed, which comprises the following steps: dispersing coated urea particles in a water-based solvent (water) or a compound organic solvent, leaching in a constant-temperature water bath at 60-100 DEG C for 5-120 minutes, melting and crushing a coating layer, and carrying out solid-liquid separation to obtain the coated urea for the feed. Carefully sucking the supernate (water phase), filtering, washing residues with pure water, and combining filtrates to obtain a to-be-detected solution; testing the refractive index of the to-be-tested liquid, substituting the refractive index into a pre-generated urea concentration-refractive index standard curve, calculating to obtain the urea concentration of the to-be-tested liquid, and further calculating the urea content of the coated urea. The method can directly aim at complete particles, pretreatment errors are avoided, operation is safe and rapid, the result is accurate and reliable, the detection period is shortened to 1 hour from 3-4 hours, and the problems that an existing method is large in sample pretreatment error, dangerous and tedious in operation, insufficient in result precision and accuracy and the like are solved.

The invention discloses a slow-mixing fertilizer suitable for increasing yield and reducing emission of machine-transplanted late rice. The slow-mixing fertilizer is prepared from the following components in parts by mass: 4-6 parts of sulfur coated urea and 4-6 parts of 3-month resin coated urea. The invention further discloses application of the slow-mixing fertilizer in late rice planting, fertilization and rice transplanting are synchronously carried out, and the slow-mixing fertilizer is directly applied to the position 5 cm away from the rhizosphere side of a seedling and the position 3-5 cm deep in soil. Compared with an existing nitrogen fertilizer management scheme, by applying the slow-mixing fertilizer, the rice yield and the nitrogen fertilizer utilization efficiency are improved by 8.26% and 32.67% respectively, and meanwhile the global warming potential and the greenhouse gas emission intensity are reduced by 10.07% and 16.81% respectively.

The application discloses a kind of special compound fertilizer of grain crops and its preparation method and application, belong to organic and microbial fertilizer technical field.The compound fertilizer includes base fertilizer and organic biological fertilizer source, wherein base fertilizer is composed of sulfur-coated urea, urea, superphosphate, potassium chloride, sodium metasilicate and oyster shell powder;Organic biological fertilizer source is composed of vinasse fermentation, microbial active protective agent and lignin sulfonate.The vinasse fermentation is obtained by using the three-stage solid-state fermentation of vinasse with the composite bacteria suspension of halophilic bacillus and ocean sedimentous bacillus.The present application realizes the synergistic effect of nutrient efficient release, soil improvement and crop stress resistance improvement by functional strain synergistic fermentation, microbial active protective agent compounding and the introduction of slow-release nitrogen source and stress resistance components.The compound fertilizer is suitable for wheat, rice and other grain crops, can significantly improve root activity, yield and stress resistance, and has wide application prospect.

This invention discloses a tower-type air-cooled cooling device and method for polyurethane-coated urea film, belonging to the field of controlled-release fertilizer processing technology. The tower body of this invention is sequentially arranged from top to bottom as a slow-cooling pre-cooling zone, a critical curing zone, and a strong-cooling dispersion zone. The device also includes three supply fans, one exhaust fan, four pulse valves, a material flow detection device, a temperature sensor group, and a controller. The four pulse valves at the bottom of the strong-cooling dispersion zone are diagonally grouped along the circumference of the tower body. The method of this invention sets different target cooling rates for the three zones based on the glass transition temperature and critical cooling rate of the polyurethane film. The controller alternately controls the diagonally grouped pulse valves according to the first and second on / off cycles, and adjusts the operating frequency of the supply fans in each zone using a combination of feedforward and feedback. This invention simultaneously suppresses film cracking and particle adhesion within the same device, significantly improving film integrity, anti-adhesion dispersion effect, and consistency of controlled-release performance compared to existing processes.

The application discloses a resin-coated urea production feeding device, which comprises a base, an upper end of the base is provided with a feeding assembly in an inclined mode, a lower end of the feeding assembly is fixedly provided with a feeding assembly, and the feeding assembly is internally provided with a filtering and scattering assembly for filtering and scattering raw materials; through the three-layer filtering and scattering assembly, not only can the impurities in the raw materials and the agglomerated materials which cannot be scattered be filtered, but also the raw materials can be scattered, so that the agglomeration of the raw materials in the feeding pipe is avoided, and the problem of material blockage of the feeding device is solved.

The invention discloses a cellulose coated urea slow-release fertilizer and a preparation method thereof, and belongs to the technical field of slow-release fertilizer preparation. The preparation method comprises the following steps: mixing an adhesive, urea and water, and granulating to obtain mixed particles; uniformly mixing a cellulose base material, a cross-linking agent, an auxiliary agent and water to obtain a coating precursor solution; mixing the coating precursor solution with the mixed particles, and drying to obtain a coating body; co-dissolving the coating body and a surface modifier in a solvent, carrying out stirring reaction, and drying to obtain a modified body; and repeating the steps of coating and modifying for 1-3 times to obtain the composite material. The invention also discloses the cellulose coated urea slow-release fertilizer prepared by the method. The cellulose coated urea slow-release fertilizer can effectively solve the problems of poor film-forming property and poor urea slow-release property of the existing urea slow-release fertilizer, and has a relatively good practical value.

This invention discloses a slow-mixed fertilizer suitable for increasing yield and reducing emissions in machine-transplanted early rice in low-latitude regions. It consists of the following parts by weight: 4-6 parts sulfur-coated urea and 4-6 parts 2-month resin-coated urea. The invention also discloses the application of this slow-mixed fertilizer in early rice production, with fertilization carried out simultaneously with rice transplanting. The slow-mixed fertilizer is applied directly to the base of the seedlings at a depth of 5 cm and 3-5 cm in the soil. This invention's slow-mixed fertilizer can increase yield, nitrogen fertilizer use efficiency, and reduce greenhouse gas emissions. Compared with conventional high-yield, multi-stage fertilization, the application of this invention's slow-mixed fertilizer increases rice yield by 7.5%-7.8%, increases nitrogen fertilizer use efficiency by 30.5%-44.5%, reduces global warming potential by 12.8%-27.5%, and reduces greenhouse gas emission intensity by 19.3%-32.7%.

This invention belongs to the field of agricultural slow-release fertilizer technology, specifically relating to a biodegradable starch-based coated urea and its preparation process. This invention provides a biodegradable starch-based coated urea that achieves a balance between excellent nutrient slow-release performance and biodegradability through a three-layer gradient structure design. The inner layer employs a high-porosity structure and incorporates copper ion-exchange zeolite powder, enabling rapid adsorption of urea molecules and delayed release through ion exchange; the outer layer is a low-porosity dense layer, forming a physical barrier; the middle dense isolation layer effectively prevents the migration of copper ions from the inner layer to the outer layer, while simultaneously blocking the rapid outward permeation of urea molecules. Through a synergistic model of inner-layer chemical regulation, middle-layer physical isolation, and outer-layer bio-enhanced treatment, nitrogen fertilizer utilization is increased by more than 20%, while also activating soil nutrients and promoting crop root growth. Moreover, the coated particles of this invention have a compressive strength of 30-34 N, meeting the requirements of mechanized fertilization and possessing broad industrial application prospects.

The invention provides a controlled-release coated urea fertilizer and a preparation method thereof, and relates to the technical field of fertilizers, the controlled-release coated urea fertilizer comprises a urea core and a composite coating layer wrapping the urea core; the composite coating layer sequentially comprises an inner layer biomass coating and an outer layer modified inorganic coating from inside to outside; the invention discloses a slow-release urea core and a preparation method thereof.The slow-release urea core is composed of, by mass, 80-100 parts of a urea core, 5-10 parts of an inner-layer biomass coating film and 3-8 parts of an outer-layer modified inorganic coating film, a double-layer composite structure of the inner-layer biomass coating film and the outer-layer modified inorganic coating film is adopted, and the inner-layer biomass coating film has certain air permeability and water absorption and can slowly release nitrogen; the outer layer modified inorganic coating can effectively prevent water from entering quickly, and the controlled release period is prolonged.

The invention relates to the technical field of feed additives, in particular to a mixed feed additive for beef cattle fattening and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing hydrogenated palm oil, palm oil, ethyl acetate and tea polyphenol, heating until the mixture is completely melted, then spraying the mixture onto the surface of granular urea to obtain palm oil-based coated urea, and then preparing a chitosan-based coating solution by inclusion of beta-cyclodextrin with vitamin E powder and O 'O-lauroyl chitosan; and finally, coating the surface of the palm oil-based coated urea by using glutaraldehyde as a cross-linking agent to form the mixed feed additive for fattening beef cattle. The prepared mixed feed additive is balanced in nutrition, nitrogen source slow release can be achieved, and the meat percentage of beef cattle is effectively increased.

The invention relates to a method for evaluating the slow release property of polyurethane coated urea based on infrared spectroscopic analysis, which comprises the following steps: acquiring relative relationship data among characteristic functional groups of a slow release fertilizer coating in infrared spectroscopic data based on the characteristic functional groups of the slow release fertilizer coating, and the relative relationship data and the slow release property of the slow release fertilizer have an association relationship; and determining the slow release performance of the slow release fertilizer based on the association relationship and a preset relationship between the relative relationship data and the slow release performance. Characteristic functional groups of the coating are subjected to qualitative recognition and semi-quantitative analysis through infrared spectroscopy, the proportion of hydrophilic and hydrophobic groups of the coating is indirectly obtained, and the slow release property of the coated slow release fertilizer is rapidly screened and evaluated in combination with slow release fertilizer release experiment verification. According to the method, complex sample pretreatment is not needed, the hydrophobicity of the coating can be preliminarily judged according to the peak intensity ratio of hydrophilic and hydrophobic groups, then the slow release performance is correlated, the evaluation period is shortened, the detection cost is reduced, and the method is suitable for mass production quality control and slow release effect pre-judgment of the slow release fertilizer.