1354results about How to "Good slow release" patented technology

The present invention provides one kind of water gel containing natural high molecular material and its preparation process. The water gel has cross-linking degree of 70-95 % and water absorption of 500-80000 %, and contains natural high molecular material or its derivative selected from chitin, chitin derivative, chitosan, chitosan derivative, carrageenin, etc. The water gel may have synthetic high molecular material, inorganic filler, cross-linking sensitizer, medicine and other assistant added. It is prepared through radiation cross-linking, with the radiation dosage being 10-40 kGy. The water gel of the present invention has high water absorption, high flexibility, good medicine slow releasing performance, and may be used in wound dressing, etc.

The invention discloses a double-layer coated essence microcapsule and a preparation method thereof. The essence microcapsule takes an oil soluble liquid essence as a capsule core, a gelatin modified amino resin composite material as a first-layer capsule wall and an acrylate polymer as a second-layer capsule wall, wherein a grafting transition area is formed by graft copolymerization of gelatin and acrylate between the first-layer capsule wall and the second-layer capsule wall. The preparation method comprises a step of prepolymer compounding, emulsification dispersion, microcapsule continuous double-layer coating and post-treatment. Compared with a single-layer coated microcaposule, the essence microcapsule has the advantages that the slow release performance, the heat resistance performance and the capsule wall material mechanical property are greatly improved, and the essence microcapsule can be used for most of microencapsulated essence products processed by heat extrusion molding of high molecular materials.

Disclosed are a preparation method and application of macroporous-mesoporous silicon dioxide hollow microsphere, which relate to the field of inorganic materials preparation and pesticide application. The process of materials preparation includes adding templates P123 in aqueous phase, after generating steady oil-water-oil dual emulsion, adding silica source tetraethyl ortho-silicate TEOS, producing hydrolysis under the effect of precipitant, generating silicon dioxide hollow microsphere, after filtering and drying, the product of the invention can be produced via calcining in 550 DEG C for 6 hours. The silicon dioxide hollow microsphere of the invention has macroporous structure and mesoporous structure. Through the mesoporous structure of the microsphere wall, realizing the communication between the hollow inside of the microshere and the outside. The invention also relates to the application in area of release carrier of the materials as avermectin drugs, the prepared release controlling agent has perfect long-acting slow release performance.

The invention provides a preparation method of drug and protein sustained-release alginate hybrid gel. The preparation method comprises the steps of preparing calcium alginate hydrogel, then soaking the calcium alginate hydrogel in inorganic salt solutions including trisodium phosphate, diammonium hydrogen phosphate, sodium silicate, sodium carbonate, sodium oxalate and the like at certain concentration to swell for a certain period of time, and soaking the swelled calcium alginate hydrogel into an aqueous solution of drugs and proteins with calcium ions at certain concentration for crosslinking for a period of time, thus obtaining the drug and protein sustained-release alginate hybrid gel. The calcium alginate hydrogel disclosed by the invention can be in the shape of a membrane, a microballoon, a fiber and the like. The method disclosed by the invention is simple to operate and does not adopt any poisonous and harmful solvent; the activity of the immobilized protein is high; the materials are good in biocompatibility; and the drug and protein sustained-release alginate hybrid gel is good in slow release performance, and has good application prospect in the fields of tissue engineering, controlled release, medicine and health, and the like.

The invention discloses a medical wound dressing which is loaded with antibiotic nanometer particles and which is in a spongy state when being dried and in a gel state after absorbing the moisture; the medical wound dressing is fixed in a spongy membrane prepared by chitosan and natural high molecular polymers and derivatives of the chitosan with the proportion of 10 to 19 percent of the spongy membrane and natural polymers by drug-loading nanometer particles; the drug-loading nanometer particles contains antibiotics with the particle size of 100nm to 1000nm, the encapsulation rate of 50 to 98 percent and the drug-loading rate of 5 to 60 percent and the weight percentage of 2 to 10 percent of the drug-loading nanometer particles in the wounding dressing. Combing the sustained and controlled release characteristic and the advantage of polysaccharide membrane, the invention has high water absorbability, air permeability, moisture permeability and good biological compatibility can keep the wound physiological moisture environment and promote the wound to recover and has hemostatic effect; at the same time, the invention has good slow release performance for the antibiotics, can prevent the infection of the wound and accelerate the recovery, thus being suitable for a plurality of wounds such as the traumas, burns and ulcers.

The invention relates to nanometer loading controlled releasing essence and the method for preparing the same, belonging to essence preparation field. The microcapsule technical essence is characterized by bad stability, not good controlled releasing performance, short fragrance retention time, and great application limit; and the product with better performance is expensive and difficult to prepare. The invention is to provide an essence- loaded porous hollow silicon dioxide controlled releasing system which is characterized by simple process and long essence retention time. The process for preparation comprises: dissloving essence or perfume compounds with different flavour into proper organic solvent, putting porous hollow nanometer silicon dioxide into it for immersion or putting into self- produced device for adsorption, filtering, drying and getting essence- loaded porous hollow controlled releasing system. The nanometer loading controlled releasing essence is suitable for demostic, artifical fabrics, paper making or air cleaning for flavour fixation and prolonging effective releasing cycle of essence flavour.

The invention discloses a mint-releasing cigarette filter tip and a production technique thereof, relating to a cigarette filter tip and the production technique thereof. The mint-releasing cigarette filter tip contains tow material in which cotton thread infused with mint essence solution is wrapped; film-forming material solution is adsorbed at the outer layer of the cotton thread infused with mint essence solution; mint essence is added in the film-forming material solution; and the film-forming material includes natural macromolecular material and synthetic macromolecular material. The mint-releasing cigarette filter tip has the advantages that: 1, adopting membrane technology, mint is low in volatility at room temperature, so the mint can be effectively released when taking the cigarette;2, the production technique is simple; 3, the mint-releasing cigarette filter tip is not changed in performance; 4, the mint-releasing cigarette filter tip can be preserved for more than one year at room temperature; 5, the mint-releasing cigarette filter tip is low in cost.

The invention discloses an environment-friendly coated fertilizer and a preparation method thereof, and relates to the technical field of sustained / controlled release fertilizers. The environment-friendly coated fertilizer comprises fertilizer particles and a coat coating the surfaces of the fertilizer particles, wherein the controlled release coat is prepared from polyaldehyde oxidized polysaccharide and protein, and in order to protect the controlled release coat, the controlled release coat is coated with super absorbent resin. The environment-friendly coated fertilizer provides required various nutrients for plants, improves the sustained release performance of nutrient elements of the fertilizer, and has multiple functions of water absorbing and retaining, sustained release, soil conditioning and the like by combining the absorbent resin.

The invention discloses a method for preparing high-temperature resistant essence microcapsules, which comprises the following steps: preparing aqueous solution of gelatin and aqueous solution of Arabic gum by gelatin and Arabic gum respectively, then adding oil-soluble essence into the aqueous solution of Arabic gum and performing homogenization and emulsification on the solution, and uniformly mixing the emulsified solution and the aqueous solution of gelatin to obtain emulsified liquid; adjusting the pH of the emulsified liquid to 4.15-4.17 by using edible acetic acid; dissolving a curing agent glutamine transaminase in water, and then mixing solution of the curing agent and the emulsified liquid to perform curing; filtering the cured emulsified liquid, discarding the supernate, and collecting the sediment; dissolving a wall material obtained by mixing Arabic gum, malt dextrin, glucose and isolated soy protein in the water, then adding the collected sediment into the solution of wall material to be uniformly mixed, and preparing the mixture into the high-temperature resistant essence microcapsules by adopting a spray drying method. The method prepares the oil-soluble essence into the microcapsules so as to keep the primary fragrance of the essence and ensure the using effect in high-temperature processing.

The invention discloses a method for preparing porous compound type high permeability absorption hemostasis coating with modified nano-crystalline cellulose, and belongs to the field of biological medical materials. The method comprises the following steps of: pre-processing bacterial cellulose by alkali water at high temperature to remove endotoxin; scattering the obtained bacterial cellulose under a high-speed bacterial pulverizer to be fine fibers; performing alkalization treatment on the fine fibers by alkali liquid with the proper concentration to activate the cellulose; adding an etherifying agent grafted modified bacterial cellulose to ensure that the fiber has a certain hemostasis function; uniformly compounding the modified bacterial cellulose with sodium alga acid to form gel network by ion crosslinking; and freezing and drying the gel network to obtain the hemostasis compound material with good performance. The porous compound material prepared by the method is a good medicine carrier, which can carry the medicines capable of resisting bacteria, stopping the pain and coagulating blood, so that the material has good medicine sustained release effect under different PH values. The porous compound material is high in biocompatibility and cell affinity, can promote proliferation and differentiation of stem cells, and facilitates rapid recovery of damaged tissues.

The utility model relates to a new drug-loading controlled-releasing microcapsule and a preparation method thereof, which belongs to the field of the material preparation and the medicine application, and is expected to have applications in the filed of the food, the spice, the makeup, the pesticide, the organism and other fields. A new micro encapsulant system of medicine / silicon dioxide with the core-shell composite structure is prepared by means of the emulsion in-situ encapsulation and synthesis, and can embed the medicine with different molecular dimensions into the cavity, that makes the new micro encapsulant system become a warehouse for medicine storage indeed, and increases the medicine load; and the release rate of the medicine can be regulated by means of the shell structure to reach the goal of slow release.

The invention discloses a chicken manure fermentation organic fertilizer, which is prepared from the following raw materials: chicken manure, straw powders, konjak flour, corn flour, cellulose, zeolite, humic acid, potassium dihydrogen phosphate, urea, peat soil, a leavening agent, a soil improvement agent, a film coating agent, potassium sulfate, borax and calcium superphosphate. The above raw materials are subjected to the integrated treatment of anaerobic fermentation and aerobic fermentation, so that the organic fertilizer is prepared through the fermentation of the chicken manure. The chicken manure fermentation organic fertilizer is complete in fermentation effect, and is capable of killing plant pathogenic bacteria, eggs, weed seeds and other harmful microorganisms in the chicken manure, and generating a large amount of nutrients beneficial to the plant growth and the plant absorption. The process is simple and easy to implement. The raw materials of the prepared organic fertilizer are rich in nutrition. Meanwhile, the prepared organic fertilizer is high in fertilizer efficiency and rich in nutrition, and can coordinate the soil nutrient balance, improve the soil nutrient, promote the plant growth, increase the plant yield and improve the plant quality.

A biological and micro-capsule technology to improve slow-release capability of micro-capsule which includes the following steps: add a strain of microorganism liquid seed into sodium alginate solution ,add the above solution into glutin-CaCl2 intermixture with certain pH value in 40-45DEG C temperature and 40-60 drops / min velocity, stabilize for3.5-5h to form micro-capsule rudiment, add CaCl2 solution to re-calcify for 10-15min, add chitosan solution with certain pH value for 2-3h for re-coacervation, immerse in steriled saline solution for 6-24h for proliferating. Micro-capsule made by this method shows uniform shape, well fastness and excellent slow-release capability.

The invention discloses a litsea cubeba oil microcapsule and a preparation method thereof, and belongs to the technical field of mouldproof and insecticidal capsules. The litsea cubeba oil microcapsule is characterized by being prepared by the complex coacervation of litsea cubeba oil taken as a core material, sodium alginate taken as a main wall material and an aqueous solution which contains 1% to 5% of chitosan and 2% to 5% of anhydrous calcium chloride and is taken as a coagulating bath solution, wherein the mass ratio of the sodium alginate to the litsea cubeba oil is 1:(1-4). The preparation method mainly comprises the following steps: firstly preparing an emulsion A of the sodium alginate and the litsea cubeba oil; then preparing the aqueous solution of the chitosan and the anhydrous calcium chloride as the coagulating bath solution B; dripping the emulsion A into the coagulating bath solution B; and solidifying the mixture for certain time and then filtering the mixture, thereby obtaining the litsea cubeba oil microcapsule. Thus, the litsea cubeba oil microcapsule which is high in litsea cubeba oil content, long in service time and good in mouldproof and insecticidal effect and the preparation method of the litsea cubeba oil microcapsule are provided. The litsea cubeba oil microcapsule is mainly used for performing mouldproof and insecticidal functions on grains as well as on clothes.

The invention belongs to the technical field of fertilizers and specifically relates to a water-retention and slow-release fertilizer. The water-retention and slow-release fertilizer comprises the following raw materials in parts by weight: 70-80 parts of coated slow-release fertilizer or low-solubility slow-release fertilizer, 15-20 parts of water retention agent, 1-2 parts of biological bacteria, 5-10 parts of humic acid and 5-15 parts of soil conditioner. The prepared water-retention and slow-release fertilizer disclosed by the invention has the advantages of low cost and simplicity and convenience in application, and can adjust the water absorbency of the fertilizer according to different crops, soil, climate and other conditions and be widely applied to grain crops, cash crops, horticultural plants and the like. The water-retention and slow-release fertilizer disclosed by the invention has long effective period, and can greatly reduce the loss of the fertilizer caused by volatilization and eluviation, enable the limited fertilizer and water to be fully absorbed and utilized by the plants, achieve the integration of the water and the fertilizer and improve the soil. Through the application of the water-retention and slow-release fertilizer, the irrigation cost of farmland can be reduced and the high-efficient water conservation purpose can be achieved. The water-retention and slow-release fertilizer disclosed by the invention can greatly improve the utilization rate of nutrients and effectively control the pollution of the crops and an environment caused by the application of the fertilizer.

The invention relates to a novel passive targeting nano emulsion with skin whitening effect and a preparation method thereof. The invention uses a novel passive targeting transdermal delivery dosing system TDDS-nano emulsion as a carrier of a function component for whitening or lighting the skin, uses different physical and chemical properties, action mechanism and actual effect of each skin whitening function component, especially the action advantages of certain novel skin whitening function components, and provides skin whitening effect nano emulsion systems with two joint applications in morning and evening matched with each other. The two joint applied nano emulsion systems not only have minimum spherical grains, extremely even distribution of nano-scale grains, remarkable passive targeting function, good transdermal absorption and strong penetrability, but also have extremely even, exquisite, smooth and glossy texture of the nano emulsion, is quite comfortable after coating on the face or the skin, has no stimulus and good stability; and the nano is light yellow, beautiful in appearance, bright and transparent, clear and crystalline, has light opalescence, and is adhesive but not sticky, thick but not heavy, oily but not greasy.

The invention relates to the technical field of medicines, and in particular relates to a micro-emulsion thermosensitive gel for skin wound healing and a preparation method thereof. The micro-emulsion thermosensitive gel disclosed by the invention is composed of medicines, oil phase, a surfactant, a cosurfactant, a gel matrix and water, wherein the medicines are selected from resveratrol, paeonol and matrine. Proved by animal experiments, the prepared micro-emulsion thermosensitive gel has the characteristics of nearly no irritation to skin, safety in use, large percutaneous infiltration quantity, high percutaneous infiltration rate, long retention time of the micro-emulsion gel in the skin, high medicine concentration in the skin, good slow-release effect and good effect of promoting the healing of skin wound injury. The micro-emulsion thermosensitive gel disclosed by the invention has the advantages of simpleness in preparation method, low cost, convenience and safety in use and capability of effectively promoting the skin wound healing. According to the invention, a novel dosage form is provided for treating the skin wound.

The invention discloses a preparation method and application of a medicament-cyclodextrin inclusion compound self-emulsifying composition. The composition is prepared through the following steps: preparing a medicament-cyclodextrin inclusion compound by combining a medicament and cyclodextrin; mixing the medicament-cyclodextrin inclusion compound, an oil phase, an emulsifier, an assistant emulsifier, a stabilizer and an additive; and completely dissolving the materials through magnetic stirring or ultrasonic; and uniformly mixing. The composition has the advantages that the defects of low solubility of poorly water-soluble drugs, low bioavailability, low drug-loading rate and the like are overcome, the medicament stability is greatly improved, the problems of poor emulsifier stability, large storage volume and the like caused by a water phase are solved, and the effect of sustaining medicament release can be achieved. The preparation method has the advantages of simplicity, developed process, high yield of the composition and suitability for industrial production.

The invention discloses a slow release fertilizer used for rice planting. The fertilizer is prepared from urea, monoammonium phosphate, potassium chloride, ammonium chloride, diammonium phosphate, calcium triple superphosphate, zinc sulfate, ammonium molybdate, ammonium nitrate complex, gamma-polyglutamic acid, attapulgite, modified sepiolite powder, kaolin powder, talcum powder, stannous chloride, sodium bisulfite, boric acid, oxalic acid, cow dung, soybean meal, furfural residues, corn straw, rape-seed cakes, bagasse, fly ash, medical stone, humic acid, EM strain, hydroxymethyl cellulose and modified sustained-release preparation. The invention further provides a preparing method of the slow release fertilizer used for rice planting. The slow release fertilizer used for rice planting has excellent slow release performance, can provide rich nutrient substances, promote the growth of the rice, increase the yield of the rice, and improve the quality of the rice.

The invention discloses a novel polysaccharide gel water retaining and slow release fertilizer and relates to the technical field of slow release fertilizers. The fertilizer consists of fertilizer particles and film covered water retaining and slow release layers covering on the surfaces of the fertilizer surfaces, wherein materials for forming the film covered water retaining and slow release layers comprise tamarindus polysaccharide and plant polysaccharide, and the plant polysaccharide is in crosslinking with the tamarindus polysaccharide and is one or several materials in starch, soluble cellulose, guar gum and konjac polysaccharide. A high molecular gel reticular structure formed by the pure nature plant polysaccharide is used for building a slow release system, so the novel polysaccharide gel water retaining and slow release fertilizer integrating the water retaining and the slow and controlled release is obtained, and the fertilizer has the advantages that stronger water absorption and water retaining performance, the nutrient loss is little, nontoxicity is realized, the biodegradable and environment-friendly effects are realized, and the like. The novel polysaccharide gel water retaining and slow release fertilizer particularly has good market prospects in regions of drought, water lack or regions with great daily evaporation capacity.

The invention relates to a slow-release compound fertilizer and a production method thereof. The slow-release compound fertilizer comprises a water-soluble granular fertilizer core and a coating layer, wherein the coating layer includes 2-3 coating layers; and the content of N, P2O5 and K2O which are contained in the slow-release compound fertilizer is respectively 4%-33%, 4%-30% and 0%-30% accounting for the total weight of the slow-release compound fertilizer. According to the invention, the coating layer of the slow-release compound fertilizer is not made from high-molecular materials or other organic polymers, the cost is reduced, and the secondary pollution of the organic polymer or the high-molecular materials on the soil is prevented; and a product formula is flexible, a production process is simplified by integrating the preparation process and compound (mixed) fertilizer production process of the slow-release compound fertilizer into a whole, the equipment investment is saved, the convenience for realizing large-scale industrial production is achieved, and no three wastes are discharged in the production process. Compared with the prior art, the slow-release compound fertilizer disclosed by the invention enhances the slow-release effect to a certain degree and meets the requirements of a chemical industry standard HG / T 4217-2011.

The invention discloses a soil improvement type biological organic composite coated fertilizer which is characterized by being prepared from the following raw materials in parts by weight: 67-70 parts of human and animal excreta, 25-30 parts of riverway sludge, 8-10 parts of diatomite, 25-28 parts of diammonium phosphate, 12-15 parts of magnesium sulfate, 15-19 parts of potassium chloride, 45-49 parts of furfural residue, 40-45 parts of animal bone meal, 50-54 parts of rice husk, 35-40 parts of saw dust, 27-29 parts of urea, 3-5 parts of amino acids, 1-2 parts of sodium tetraborate, 7-8 parts of an EM fungicide, 7-9 parts of a soil improvement agent and a proper amount of water. The fertilizer disclosed by the invention is balanced in nutrition, contains inorganic elements and mineral substance components such as the riverway sludge and diatomite, the nutrient needed by plant growth is met, the soil is activated, and the water and fertilizer retaining properties of the soil are improved; and due to the addition of the soil improvement agent, the fertilizer has the effects of improving the efficiency and promoting plant nutrition absorption. According to the fertilizer disclosed by the invention, the urea melting and coating process is adopted, the slow-release effect is obvious, and the fertilizer efficiency is lasting.

The invention discloses a preparation method of a synthetic type polycarboxylic acid water reducer. The synthetic type polycarboxylic acid water reducer has a solid content of 40-50%, and is prepared from the following raw materials in parts by weight: 100 parts of unsaturated polyoxyethylene ether, 7-15 parts of unsaturated acid, 4-10 parts of unsaturated ester, 1-3 parts of an amide derivative, 0.5-2 parts of an oxidant, 0.2-1.2 parts of a chain transfer agent, 0.3-2 parts of a reducing agent, 0.1-1 part of a crosslinking agent, 0.01-0.1 part of ferrous sulfate heptahydrate, 5-10 parts of a commercially available mud-resistant auxiliary agent, 90-130 parts of deionized water and an appropriate amount of liquid caustic soda. The preparation method disclosed by the invention adopts a normal-temperature oxidation-reduction initiating system to synthesize the synthetic type polycarboxylic acid water reducer which not only has functions of water reduction and slump loss resistance, but also has functions of mud resistance and early strength, heating is not needed for reaction, the energy consumption is reduced, and the production cost is greatly reduced.

The invention relates to a spice slow-release filter tip additive with a polymer covering film as well as a preparation method and an application thereof, which belong to the technical field of cigarettes. The spice slow-release filter tip additive with the polymer covering film is of a three-layer sandwich structure, an inner core is made from porous materials, the covering film is made from polymers, and spices are fixed in a middle layer of the additive. The filter tip additive is added to a cigarette holder in an adding manner of ordinary filter tip particles, so as to prepare a cigarette. When the cigarette is smoked, the position of the particles in a filter tip is kneaded by hand, so that the spices in a sandwich layer are released, the aroma and flavor of smoke are increased, and the quality of the cigarette is increased. After the filter tip additive which is prepared by using the method is added to the cigarette, the non-burning section of the cigarette can be effectively perfumed, so that the aroma in an early manufacturing stage is prevented from being quickly volatilized, and the aroma and flavor of the cigarette can be kept for a long time.

The invention discloses compound fertilizer having growth promotion and high slow-release properties and used for rice planting. The compound fertilizer is prepared from raw materials as follows: ammonium nitrate, monopotassium phosphate, urea, urea phosphate, calcium superphosphate, ammonium dihydrogen phosphate, potassium sulfate, magnesium sulfate, potassium nitrate, amino sodium dicarboxylate, Trichoderma, yeast powder, straw fermentation bacteria, cellulase, potassium mineral powder, rare earth, low-rank coal, silico-calcium powder, turf powder, fly ash, pine sawdust, kaolin, rice hull powder, poultry manure, maize straw, blue-green alga powder, dolomite, diatomite, calcite, humic acid, lignin, EDTA (ethylene diamine tetraacetic acid) chelate zinc, amino acid chelated molybdenum, dicyandiamide, phosphoric triamide and a modified slow-release agent. The invention further discloses a preparation method of the compound fertilizer having growth promotion and high slow-release properties and used for rice planting. The compound organic fertilizer has outstanding slow-release performance and can effectively increase the rice yield and improve the rice quality.

Compositions and systems for topical ophthalmic application, which include an aqueous mixture of steroidal and non-steroidal anti-inflammatory agents in a flowable mucoadhesive polymer, for treating inflammation and inflammatory conditions of the eye.

The invention provides an in-situ phase change gel slow release system taking a phospholipid as a substrate, and provides a preparation method thereof. A high-concentration phospholipid slow release preparation is prepared from a high-concentration (50-85 percent) phospholipid, a bioactive ingredient, ethanol solutions of different concentrations and / or injection oil with a simple method, and has the characteristics of high biocompatibility, small untoward effect, remarkable slow release effect and suitability for various administration forms such as hypodermic injection, intramuscular injection, external administration and the like; the amount of a coated medicament can be conveniently adjusted according to the clinical dosage of a medicament; and the in-situ phase change gel slow release system has a wide application prospect.

The invention aims at providing a method for preparing a multi-drug multi-coating eluting intravascular stent through ultrasonic atomizing and spraying, wherein VEGF, SZ-21 and other protein drugs, taking chitosan as a drug carrier, form a first coating; the second layer is a shielding layer, which adopts a polymer poly L lactic acid (PLLA) and can be added with polyethylene glycol (PEG) in different proportions to control release speed of drug; the third layer is lipid soluble medicine, such as rapamycin, which uses PLLA as a drug carrier; and a coating at the top end of the fourth layer, same as the second layer, is a shielding layer. Two uniform drug polymer coatings can simultaneously load multiple drugs, and the release speed of the drug can be regulated and controlled by regulating a mixing proportion of the PEG and the polymer, so as to inhibit restenosis and to reduce formation of thrombus simultaneously.

The invention discloses a water-retaining and slowly-release compound fertilizer and a preparation method thereof. The water-retaining and slowly-release compound fertilizer is prepared from the following components in parts by weight: 60-75 parts of chemical fertilizers, 1-6 parts of a water-retaining agent and 19-39 parts of filler, wherein the chemical fertilizers are at least two of a nitrogen source fertilizer, a phosphorus source fertilizer and a potassium source fertilizer; the water-retaining agent is at least one of polyacrylamide, sodium polyacrylate and sodium carboxymethylcellulose; the filler is at least one of bentonite, attapulgite, kaolin, talcum powder and gypsum powder. The preparation method comprises the following steps: 1) mixing the chemical fertilizers, the water-retaining agent and the filler to obtain a mixture; 2) adding water in the mixture and granulating; stopping adding water when small particles are formed, then adding the filler powder, granulating, and finally drying to obtain the water-retaining and slowly-release compound fertilizer. The water-retaining and slowly-release compound fertilizer disclosed by the invention has a water-retaining property and a slowly-release property, and is capable of reinforcing the water-retaining and water-holding capacities of soil, increasing the utilization rate of water resources, increasing utilization rate of the fertilizers, reducing nutrient loss, resisting drought, and reducing the pollution of fertilization to an ecological environment; the preparation method is simple and easy to process and produce.

The invention discloses a biomass charcoal-enveloped controlled-release fertilizer and a preparation method thereof. The fertilizer is prepared from the raw materials of, by weight: 20-30 parts of rice husk, 45-70 parts of a 3-6wt% sodium hydroxide solution, 10-15 parts of corn straw, 20-30 parts of urea, 15-25 parts of attapulgite, 10-15 parts of ammonium bicarbonate, 8-12 parts of potassium sulfate, 4-6 parts of trace elements, 15-25 parts of a calcium-magnesium-phosphorous fertilizer, 6-8 parts of a binding agent and a proper amount of water. Specifically, the enveloped controlled-release fertilizer is prepared with a rice husk and plant straw sealed charring technology and with the binding agent prepared from polyvinyl alcohol. As a result of tests, the biomass charcoal-enveloped controlled-release fertilizer has a significant controlled release effect. According to different plant requirements, the controlled-release speed can be adjusted by adjusting the proportion of the added enveloping agent. Most of the components in the enveloping agent is biomass charcoal, such that the pollution degree to the environment is almost zero. Also, a fertilizer dose is reduced, and fertilizer utilization rate is greatly improved.