288results about How to "Long release period" patented technology

The invention provides sustained-release chlorine dioxide gel comprising the following components by weight percent: 0.1% to 5.0% of chlorine dioxide precursor, 1.0% to 10.0% of gel, 0.01% to 2.0% of chelating agent, 0.1% to 10.0% of inclusion agent, 30% to 70% of activating agent, 0.1% to 5.0% of sustained-release agent, 0.1% to 5.0% of stabilizing agent and deionized water in balancing amount. The sustained-release chlorine dioxide gel of the invention is capable of conducting the stable sustained-release process at a certain rate for 3 to 6 months, so the sustained-release chlorine dioxidegel has the advantages of long release period, uniform and stable release rate and lasting effect; the sustained-release chlorine dioxide gel is capable of not only removing formaldehyde from indoor air in an effective, safe and lasting way and ensuring the high removal rate of formaldehyde, but also disinfecting and sterilizing the indoor air continuously and thoroughly purifying the indoor air;moreover, the invention dispenses with high-purity chlorine dioxide gas and further has the advantages of simple preparation method and convenient operation.

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 relates to an anti-pollution alga finishing agent and an application method thereof. The finishing agent is compounded by silver-containing multiaperture inorganic polymer material and polymeric flocculant, or nanometer silver natural biological polymer material or polymer material and made into powder, particle products; or the silver-containing multiaperture inorganic polymer material self mixes with resin to produce various spheres, sponge products, etc. The aperture of the silver-containing multiaperture inorganic polymer material is 5-50nm and the silver content is 0.01-10 percent (weight); the multiaperture inorganic polymer material(s) is one or a plurality of glass, ceramics, diatomite, kaoline, zeolite, molecular sieve and nanometer anion powder, therefore, silver is one or a plurality of Ag simple substance, Ag ion, Ag2O and AgO and is combined with the multiaperture framework of the multiaperture inorganic polymer materials. The invention has simple application and is suitable for treating water pollution caused by algae in rivers and pools and improving microenvironment of water body of aquatic product and fancy fishery cultivation.

The invention discloses a multifunctional compound fertilizer additive and a preparation method thereof. The preparation method comprises the following steps: uniformly spraying a compound amino acid complex solution of trace elements containing Fe, B, Mn, Cu, Zn and Mo, rare earth elements containing Ce and La and beneficial mineral elements containing Ni, Co and Ti on grass carbon, brown coal or weathered coal powder, airing or drying, and then crushing to obtain a material A; preparing dicyandiamide used as a nitrification inhibitor into an ammonia solution to be adsorbed on carboxymethyl cellulose used as a water retention agent, airing or drying, and then crushing to obtain a material B; mixing cobalt sulfide and molybdenum sulfide which are used as nitrogen fixation catalysts with bean cakes or corn starch to obtain a material C; and uniformly mixing the material A, the material B and the material C to obtain the additive. The multifunctional compound fertilizer added with the additive of the invention has the advantages of fixing nitrogen, dissolving phosphorus, enriching soil, reducing nutrient loss, improving nutrient utilization ratio, improving crop enzyme activity, promoting metabolism, improving crop quality, increasing crop yield, retaining water, saving water, resisting drought, regulating buffering acidity or saline-alkali soil, and improving soil structure.

The invention discloses a method for producing an organic fertilizer through biodegradation of died livestock. The method comprises the steps of fully mixing died livestock bodies with a compound microbial agent according to a proportion of 100Kg: (30-45L), then fully mixing with chicken manure, sludge and straw, putting into a fermentation tank for fermenting, and turning over in fermentation, wherein the ventilator capacity is 0.8-1.0VVM, the pressure of the tank is kept at 0.03-0.05Mpa, the temperature is at 55-62DEG C, and the period is 2-3 days. The organic fertilizer can reduce the cost of the fertilizer by over 65%, and can prolong the fertilizer nutrient release period to about 120%; due to adoption of the organic fertilizer, great pressure of the livestock died of disease on the environment can be lowered, so that the habitat balance is maintained; the compound microbial agent can ferment and degrade the livestock died of disease into organic fertilizer safely and efficiently in short time, so that the great pressure of the livestock died of disease on the environment can be lowered, furthermore, the waste is turned into wealth.

The invention discloses a decomposable polymer film-typed slow release fertilizer, which consists of fertilizer core 1 and film, wherein the film is composed of (a) high-impedance porous organic film 2, (b) compound film 3 with sulphur and or decomposable polymer layer 4, which is whole film lining or middle layer; the decomposable polymer can be one or more of amino resin, polyvinyl alcohol and acetal resin of polymer, unsaturated oil resin and natural polymer and derivant.

The invention discloses an environmentally degraded enveloped slow release chemical fertilizer, which comprises a chemical fertilizer core and a chemical fertilizer core envelop. The envelop is a composite film formed by a film A and a film B, wherein the film A is a polymer film of a polar natural polymer and a derivative thereof with the mass fraction not smaller than 20 percent, the film B is a high-permeability resistance organic film of a polar natural polymer and a derivative thereof with the mass fraction smaller than 20 percent, the mass fraction of the polar natural polymer and the derivative thereof in the film A is preferably 25-50 percent, and the mass fraction of the polar natural polymer and the derivative thereof in the film B is preferably zero. In the envelop of the environmentally degraded enveloped slow release chemical fertilizer, the aggregate thickness of the film A is preferably 3 times or more of the aggregate thickness of the film B, the aggregate thickness of the envelop is preferably 22-200 mu m, the aggregate thickness of the film A is preferably 20-180 mu m, and the aggregate thickness of the film B is preferably 2-30 mu m. The envelope of the slow release fertilizer is partially environmentally degradable and has longer release period.

The present invention is slow released ClO2 air disinfectant, and belongs to the field of hygienic disease controlling and sterilizing technology. The slow released ClO2 air disinfectant consists of ClO2 solution in 1-3 weight portions, silicon gel as the carrier of ClO2 solution in 3 and activator in 0.005-0.1 weight portions. The slow released ClO2 air disinfectant has homogeneous and lasting release to maintain proper ClO2 concentration in the air and reach excellent air disinfecting effect. The used silicon gel may be recovered and reused after treatment.

The invention discloses an immobilized chlorine dioxide sustained-release gel material and a preparation method thereof. The immobilized chlorine dioxide sustained-release gel is prepared from a chlorine dioxide precursor, a carrier, an activating agent, a stabilizing agent, essence, gel, water and other raw materials. In order to better control the chlorine dioxide release rate, the preparation scheme provided by the invention is characterized in that the activating agent is immobilized in pore channels of a porous carrier; the carrier is dispersed into the gel; by adopting the scheme of theinvention, on one hand, the reaction rate of the chlorine dioxide precursor and the immobilized activating agent is controlled, and on the other hand, the generated chlorine dioxide gas can be released into the environment only by overcoming the diffusion resistance of the pore channels in the carrier and the diffusion resistance of the gel outside the pore channels, so that the generation rate ofchlorine dioxide and the release rate after the chlorine dioxide is generated can be effectively adjusted. The immobilized chlorine dioxide gel material disclosed by the invention is stable in storage, the chlorine dioxide gas is not leaked, the phenomenon that chlorine dioxide is sharply released at the initial stage of gel formation in the prior art can be overcome in the using process, the chlorine dioxide gas can be released stably for a long time, and the effects of removing peculiar smells, sterilizing, disinfecting and removing volatile organic matter such as formaldehyde in the indoorenvironment can be achieved.

The invention relates to an organic fertilizer prepared from sludge, which comprises the following components in percentage by weight: 60-70% of sludge, 27-35% of organic waste and 3-5% of biomass fermenting enzyme. The sludge is pure sludge in which heavy metals and substances that are harmful to plant growth are removed. The organic waste comprises 5% of plastic waste, 8% of waste rubber, 5% of fiber fabric, 12% of waste paper, 15% of rice bran, 14% of coconut shell, 6% of leaf, 10% of bark, 3% of flower and grass, 7% of kitchen peel, 5% of cake pulp, 5% of vinasse and 5% of bagasse. The organic fertilizer can effectively improve the soil structure, has longer effective time, can lower the fertilizer use cost, and enhances the environmental contribution rate.

The invention discloses a special lecithin-coated slow release fertilizer for cotton. The slow release fertilizer is prepared from the following raw materials: urea, monoammonium phosphate, potassium chloride, ammonium chloride, superphosphate, zinc sulfate, borax, lecithin and amidinothiourea; and the production method of the slow release fertilizer comprises the steps of: firstly, granulating monoammonium phosphate, potassium chloride, ammonium chloride, superphosphate, zinc sulfate, borax and most part of urea (used after fusion) to form inner-layer particles; then spraying mixture of the rest of urea (used after fusion) and amidinothiourea on the inner-layer particles; and coating the outer layer with lecithin. As a sustained-release material (lecithin) and a controlled-release material which is amidinothiourea serving as a urease inhibitor and a nitrification inhibitor are selected and used in the slow release fertilizer, the effective period of a nitrogenous fertilizer is prolonged to 121 days from about 30 days, the effective period of the nitrogenous fertilizer is prolonged greatly, the utilization rate of the nitrogenous fertilizer for cotton is improved greatly, the utilization rate of the nitrogenous fertilizer in a cotton season is improved by 37%, the fixation and the loss of a phosphorus potassium fertilizer are reduced, and the utilization rate of the phosphorus potassium fertilizer in a cotton season is improved by 13% and 5% respectively.

The invention discloses a preservative for fruits. The preservative for fruits is formed by mixing the following components in percentage by weight: 5 to 20 percent of sucrose ester, 5 to 20 percent of sodium benzoate, 20 to 40 percent of malic acid, 10 to 40 percent of lignin, 10 to 40 percent of chitin and the balance of water. The preservative for fruits is simple in preparation method, reasonable in formula, low in cost, convenient to operate during use, long in release period, uniform in effect and good in fresh-keeping effect. When the preservative for fruits is in use, fruits are required to be placed into the preservative for 2 to 5 minutes.

The invention provides a radix isatidis cellulose fiber 5.5-5.56 cN / dtex in dry strength, 2.61-2.68cN / dtex in wet strength and 26.2%-26.7% in elongation at dry break. The invention further provides a preparation method of the fiber. The preparation method includes: adding a dispersing agent 4-4.3% in content. The slow release period of effective ingredients of radix isatidis in the radix isatidis cellulose fiber can reach more than 1.5 years; textile produced by adopting 100% of the radix isatidis cellulose fiber has functions of removing heat to cool blood, resisting viruses and enhancing immunity; the fiber prepared from the method is good in antibacterial effect, antibacterial rate to staphylococcus aureus reaches more than 9.4%, the antibacterial rate to escherichia coli reaches more than 99.5%, the antibacterial rate to monilia albicans reaches more than 97.5%, and after washing, the antibacterial effect is kept persistently.

The invention discloses an environment-friendly coated slow-release fertilizer for wheat. The environment-friendly coated slow-release fertilizer is prepared from raw materials in percentage by weight as follows: 15%-22% of urea, 26%-34% of monoammonium phosphate, 16%-23% of potassium chloride, 6%-12% of ammonium nitrate phosphorus, 1%-5% of ammonium sulfate, 1%-3% of potassium sulfate, 5%-15% of an organic fertilizer, 2%-5% of a microelement fertilizer, 0.1%-0.5% of a chemical fertilizer synergist, 4%-10% of modified tapioca flour and 2%-8% of an auxiliary. The environment-friendly coated slow-release fertilizer for the wheat can sufficiently supply nutrients to the wheat, nutrient supply is lasting and coordinating, release of nutrient elements can be controlled, the fertilizer can be applied once without topdressing, meanwhile, soil pollution cannot be caused, and the quality and the yield of wheat are remarkably improved.

The invention relates to a special controlled release fertilizer for orange and a preparation method thereof and belongs to the technical field of sustained release fertilizer and controlled release fertilizer. According to the rule of the fertilizer requirement of the orange, the invention remixes 6 percent, 7 percent and 8 percent thermoplastic resin coated urea, sulfur coated urea, potassium sulfate complex fertilizer, the potassium sulfate, diammonium phosphate, zinc sulfate and borax exactly to form the special controlled release fertilizer for orange. The nutrient release rule of the controlled release fertilizer is in accordance with the nutrition absorption rule of the orange, which improves the fertilizer absorption and utilization rate and reduces the cost of the controlled release fertilizer, and the effect of production increase is good.

The invention relates to a composite rice seedling agent and a preparation method thereof. The composite rice seedling agent comprises the following components based on 1000kg: 420-490kg of acidified coal slag, 100-150kg of sulfuric acid, 200-230kg of diammonium phosphate, 70-110kg of ammonium sulfate, 65-85kg of nitro humic acid, 30-40kg of rare earth, 27-35kg of potassium sulfate, 10-12kg of zinc sulfate and 8-10kg of iron sulfate. The composite rice seedling agent provided by the invention can be used for preventing and treating rice seedling blight and improving the disease-resistant capability and development quality of rice seedlings so that the rice seedlings can well thrive.

The invention discloses a nitrogenous fertilizer coated slow release fertilizer. The nitrogenous fertilizer coated slow release fertilizer consists of a fertilizer core and a fertilizer core external coating. The coating is an amino resin-expanded graphite compound film layer or a composite film layer of the amino resin-expanded graphite compound film layer with a degradable polymer film layer. The degradable polymer is preferably amino resin. The amino resin is urea resin and / or malamine resin. The coating also can be compounded with a sulfur film layer and / or a high permeability resistant organic film layer. The resin-expanded graphite compound film layer can be mixed with high permeability resistant organic substance. The mass fraction of expanded graphite in the resin-expanded graphite compound film layer is preferably within the range of 2 percent to 15 percent. The total thickness of the coating is more than or equal to 40mum; the thickness of the high permeability resistant organic film layer is preferably less than or equal to 20mum; and the thickness of the sulfur film layer is preferably less than or equal to 50mum. A (main) coating layer of the nitrogenous fertilizer coated slow release fertilizer is harmless to the environment and is the nutriment in the fertilizer, and the nitrogenous fertilizer coated slow release fertilizer has low cost and long release period.

The invention belongs to the field of fertilizers for crops and particularly relates to a special ecological fertilizer for maca as well as a preparation method thereof. The special ecological fertilizer is prepared by mixing decomposed manure, agricultural and forestry wastes, urea, a phosphate fertilizer, potassium humate, medium trace elements, an activating agent and a water retaining slow-release agent at a certain weight ratio. A compound fertilizer with charcoal serving as the substrate is prepared by carbonizing the agricultural and forestry wastes into charcoal and fully mixing the charcoal with the decomposed manure and the chemical fertilizers. The content of total nitrogen and available phosphate in soil can be increased due to the application of the compound fertilizer. The loss of nutrients in the compound fertilizer due to elution can be reduced, and the utilization rate of the compound fertilizer can be increased. The water retaining slow-release agent is added into the compound fertilizer to form the ecological fertilizer with water retaining and slow releasing capacities. The special ecological fertilizer for maca is reasonable in formula, contains multiple balanced nutrients, is improved in utilization rate significantly and can be used for greatly improving the yield and quality of maca. In addition, the special ecological fertilizer for maca can be used for improving the environment of soil, enhancing the fertilizer retaining and supplying capacity and buffering capacity of soil, reducing pests and diseases and increasing the economic benefit of maca due to long-term application.

The present invention is one kind of artificial tooth root material with surface porous Ca-P bioactive ceramic coating layer and bone morphogenetic protein and its preparation process. The artificial tooth root material consists of metal tooth root substrate, one layer of double-layered porous Ca-P bioactive ceramic coating layer on the surface of the metal substrate, and bone morphogenetic protein covering the bioactive ceramic coating layer. The preparation process includes machining artificial tooth root with titanium or titanium alloy; surface activating the artificial tooth root, two-step bionic deposition to form the porous biological Ca-P ceramic coating layer comprising the compact non-crystal calcium phosphate base layer and the porous crystalline bone-like apatite surface layer; and soaking the artificial tooth root inside mixed solution comprising bone morphogenetic protein and buffering phosphate solution.

The invention provides a motherwort cellulose fiber. According to the fiber, the content of motherwort extracts is 8.2-8.5%, the dried break strength is greater than or equal to 4 cN / dtex, the wet break strength is greater than or equal to 2.2 cN / dtex, and the dried break elongation is greater than or equal to 24%. The invention further provides a preparation method of the fiber. The method comprises the steps of preparing motherwort gelatin fluid, preparing motherwort microcapsules, adding a dispersing agent, and preparing a spinning stock solution. According to the motherwort cellulose fiber prepared by the preparation method disclosed by the invention, the slow release period of effective components of motherwort is long, and reaches 1.5-2.5 years. According to the motherwort cellulose fiber prepared by the preparation method disclosed by the invention, the content of the motherwort extracts is 8.2-8.5%, the dried break strength is greater than or equal to 4 cN / dtex, the wet break strength is greater than or equal to 2.2 cN / dtex, the dried break elongation is greater than or equal to 24%, the quantity of residual sulfur is less than or equal to 4.2 mg / 100g, the rate of extra-long fibers is less than or equal to 1.0%, and long fibers are less than or equal to 10 mg / 100g.

The invention relates to a coated synergistic nitrogen fertilizer composition and a preparation method thereof. The nitrogen fertilizer composition contains 0.01-30.0 percent of gamma-polyglutamic acid. The preparation method of the nitrogen fertilizer composition comprises the following steps of: adding water into the gamma-polyglutamic acid and mixing to obtain gamma-polyglutamic acid solution; adding an auxiliary agent into the gamma-polyglutamic acid solution to obtain gamma-polyglutamic acid coating solution; and uniformly spraying the gamma-polyglutamic acid solution to nitrogen fertilizer particles to uniformly mix, then drying and quantitatively packaging to obtain a finished product. According to the product, the release time of the fertilizer in soil is about 4 times longer than that of the conventional fertilizer, the using amount of the fertilizer can be directly reduced by over 20 percent, and the cost is saved on the basis of guaranteeing the yield of crops.

The invention relates to urea-coated composite emulsion and a preparation method and application thereof. The urea-coated composite emulsion consists of waterborne polyurethane emulsion, styrene-acrylic emulsion, nonionic surfactant and the like, or consists of waterborne polyurethane emulsion, styrene-acrylic emulsion, nonionic surfactant, organic silicon emulsion and the like. The urea-coated composite emulsion provided by the invention delays quick release of fertilizer, obviously increases the release time, and can be matched with the nutrient intake of plants particularly by ternary blending. The coated composite emulsion provided by the invention can be used for coating any water-soluble fertilizer and has very broad application prospect.

The invention relates to a preparation method of a cyclopropene preservative paper. The method comprises the steps of: 1. preparation of a 1-MCP (1-methylcyclopropene) inclusion complex: adding metallic lithium and anhydrous tetrahydrofuran into a three-necked bottle equipped with a condensing tube and a dropping funnel, adding diisopropylamine slowly in a dropwise manner till complete disappearance of metallic lithium, thus obtaining the reaction product lithium diisopropylamide; and then, adding 3-chloro-2-methylpropene slowly in a dropwise manner, introducing the reaction-produced gas into an alpha / beta-cyclodextrin absorption liquid, then performing centrifugation and drying, thus obtaining the 1-MCP inclusion complex; 2. mixture preparation: weighing the 1-MCP inclusion complex obtained in step 1, then weighing a water absorbent, a dispersing agent, and a sustained-release agent, and conducting mixing; and 3. filling sealing: loading the mixture obtained in step 2 into a film with breathability and moisture permeability uniformly, and performing heat sealing to obtain the cyclopropene preservative paper. The cyclopropene preservative paper provided in the invention is simpler and more convenient to use, and is easy for large-scale popularization and application; the water absorbent can rapidly absorb moisture in the air so as to accelerate the 1-MCP gas release rate of the inclusion complex; and the sustained-release agent can extend the release period of 1-MCP so as to achieve a more excellent preservation effect.

The invention discloses controlled-release antibiotic expanded acrylic bone cement prepared by mixing a solid phase and a liquid phase according to a ratio of 1g: (0.6ml-0.9ml), wherein the solid phase includes polymethyl methacrylate, antibiotic loaded microspheres with expandable core-shell structures and barium sulfate which are in the mass ratio of (5-7): (2.1-4.5): (0.5-0.9), and the antibiotic loaded microspheres with expandable core-shell structures contain carboxylated graphene; and the liquid phase includes methyl methacrylate, an accelerant and a retardant which are in the mass ratioof (8.5-9.5): (0.25-0.5): (0.25-1). The invention further discloses a preparation method of the controlled-release antibiotic expanded acrylic bone cement. The bone cement prepared by using the method has a better expansion ratio, also has a sensitive pH response function and is capable of realizing long-acting drug release as required according to the pH change of a microenvironment surroundingan implant, so that the release ratio of antibiotics is increased.

The invention discloses a nitrogenous envelope slowed release fertilizer, which comprises a fertilizer core and an envelope outside the fertilizer core; the envelope is an amino resin envelope; fertilizer-resistance inorganic padding with the grain diameters equal to or less than 3 microns are wrapped on the surface of the envelope; wherein, the amino resin can be urea formaldehyde resin and / or melamine resin. The fertilizer-resistance inorganic padding wrapped on the surface of the envelope are better to be nano padding with the grain diameters equal to or less than 1 micron, and can be one or more than one of nano calcium carbonate, white carbon black and nano carbon black. The wrapped (nano) fertilizer-resistance inorganic padding can comprise fertilizer-permeable padding and / or the fertilizer-resistance inorganic padding with the grain diameters more than 3 microns. The fertilizer-permeable padding can be one or more than one of natural organic powder, clay powder, water-soluble grains, and the like. The thickness of the envelope is better to be between 50 and 220 mu m. The organic envelope body of the slowed release fertilizer is harmless to the environment, and is a nutriment in a fertilizer, with low cost and long and adjustable release period.

The invention discloses an insecticide microcapsule suspension type liquid medicine fertilizer and a preparation method and application thereof.The insecticide microcapsule suspension type liquid medicine fertilizer is prepared from insecticide, an organic solvent, a cyst wall material, a pH adjusting agent I for preparing microcapsules, a nitrogen fertilizer, a phosphate fertilizer, a potash fertilizer, a micronutrient fertilizer, an emulsifying agent, a filler, a dispersing agent, a defoaming agent, a thickening agent, an antifreezing agent and water, wherein the pH adjusting agent I is acid.The raw materials further include a pH adjusting agent II for adjusting the pH value of the liquid medicine fertilizer, wherein the pH adjusting agent II is alkali.The average control effect of the insecticide microcapsule suspension type liquid medicine fertilizer on wheat aphid is 80.0% or above, meanwhile, the yield of eggplants can be increased, and the N, P and K unit nutrient partial productivity is improved.The insecticide microcapsule suspension type liquid medicine fertilizer is simple and reasonable in technology, reduces the material grinding size as much as possible, is low in energy consumption, suitable for industrial production and suitable for being adopted in a small area, and saves material resources, financial resources and labor force.

The invention relates to uniform-sized konjak gulcomannan microspheres. The average particle size of the microspheres is less than 10 mu m; the content of the konjak gulcomannan in the microspheres is greater than 20% (w / w); the particle size is uniform; and the particle size distribution coefficient Span value is less than 0.9. The invention further provides a preparation method of the microspheres. According to the invention, the problems that the konjak gulcomannan microspheres of which the particle size is less than 10 mu m are hard to prepare by using the conventional method and the prepared microspheres are not uniform in particle size are solved.

The invention discloses a preparation method of a drought-resistant water-retaining agent, and belongs to the technical field of soil fertilizers and water-saving agriculture. According to the preparation method provided by the invention, N, N-methylene bisacrylamide is used as a crosslinking agent, potassium persulfate is used as an initiator, carboxymethyl cellulose is subjected to graft copolymerization with acrylic acid and acrylamide, so that the number of space network crosslinking points is further increased; after being effectively grafted with hydrophilic monomers acrylic acid and acrylamide, a large network structure can be formed, liquid can be better absorbed and retained, the water holding capacity of soil can be increased, the moisture evaporation rate of the soil can be reduced, and modified montmorillonite is added at the same time, and because montmorillonite bentonite has the characteristics of relatively high cohesiveness, cation exchange property, hygroscopicity andthe like, the characteristics have good effects of adjusting physical and chemical properties of the soil and improving water, fertilizer and gas heat of the soil. The preparation method provided bythe invention solves the problems that an existing soil drought-resistant and water-retaining agent can cause soil hardening and the drought-resistant and water-retaining capacity of the soil is not high when used in the soil for a long time.

Currently, continuous reduction of soil fertility and serious salinization are caused by using a great deal of chemical fertilizer, meanwhile, necessary nutrient components in soil flow away along with water in the irrigation process when organic fertilizer is used to cause nutrition shortage, and consequently plant and crop growth is affected seriously. The invention discloses a slow release fertilizer production technology and a using method of slow release fertilizer, wherein the slow release fertilizer takes charcoal synthesized by biomass solid waste as the raw material and has the function of enriching nutrient elements, the method can be used for effectively adjusting the pH value of soil and improving the salinization current situation, soil fertility is improved, the application amount of chemical fertilizer is substantially reduced to conserve cultivated land, and sustainable utilization of cultivated land is achieved.

The invention relates to an oil field down-hole antiscaling agent and its preparing process which comprises, weighing silica, sodium carbonate, sodium tripolyphosphate, alkali metal salt, alumina, and tinkalite, mixing homogeneously, throwing into 1000 deg. C - 1500 deg. C sintering furnace for agglomeration, transforming the raw material from solid phase to liquid phase, and feeding into die arrangement for modeling, distressing through heat treatment by kiln, modeling to obtain the vitrified solid antiscaling product capable of dissolving slowly.