106 results about "Urea-formaldehyde" patented technology

The invention belongs to the technical field of concrete, and particularly relates to green high-strength concrete and a preparation method thereof.The preparation method comprises the steps that an organic phase-change material with the phase-change temperature being 0-10 DEG C is taken and packaged with a polymethyl methacrylate shell, and organic microcapsules are prepared; taking an inorganic phase-change material with the phase-change temperature of 50-95 DEG C, and packaging the inorganic phase-change material with a urea-formaldehyde resin shell to prepare an inorganic microcapsule; the organic microcapsules and the inorganic microcapsules are mutually combined to form microcapsule pairs; coating the micro-capsule exterior with a silicon dioxide shell to obtain phase change particles; and mixing the phase change particles into the concrete to obtain the high-strength concrete. The green high-strength concrete disclosed by the invention contains two phase change materials with different phase change temperatures, so that heat can be stored during internal temperature rise, and the temperature rise rate in the concrete is effectively reduced; meanwhile, the low temperature of the outer wall needs to be relieved, the freezing damage influence is relieved, the internal and external temperature difference is reduced, caused thermal stress is reduced, and therefore the cracking risk is reduced.

The invention discloses an oral dispersion liquid composition capable of effectively inhibiting bacteria, and relates to the technical field of nano-emulsion / micro-capsule suspension liquid. Aiming at the problems of transient antibacterial effect, strong irritation and poor dispersibility of the traditional oral care product, the composition is prepared by adopting a nano-emulsion and micro-capsule technology. A bacteriostatic agent (such as nano-silver and thyme volatile oil) is wrapped in urea formaldehyde microcapsules through an interfacial polymerization method, and protection and controlled release of active ingredients are achieved. The nano-emulsion is prepared by compounding Span and Tween emulsifiers, so that high dispersity and permeability are ensured; tea polyphenol is added as an antioxidant, so that the stability is enhanced. The preparation method comprises the steps of nano-emulsion preparation, active ingredient microencapsulation, disperse system construction and sterilization filling, and the particle size D90 of a final product is smaller than or equal to 200 nm. The composition has a lasting antibacterial effect, good stability and safety, and is suitable for oral health maintenance.

The invention belongs to the technical field of coating self-repairing, and relates to a preparation method of a modified urea formaldehyde microcapsule containing a drying oil repairing agent. Preparing the microcapsule by using a two-step in-situ polymerization method, wherein the microcapsule mainly comprises a capsule core and a capsule wall. Wherein the capsule core is a dry oil repairing agent, and the capsule wall is urea-formaldehyde resin copolymerized and modified by melamine. According to the microcapsule provided by the invention, the defect that the dry oil core material is easy to leak is overcome through a simple modification process while high repairability endowed by the dry oil capsule core is considered, and the storage life of a microcapsule product coated with the dry oil in an air environment is greatly prolonged.

Cellulose / urea-formaldehyde water-retaining slow-release fertilizer granules prepared by means of a polycondensation-grafting-crosslinking integrated reaction extrusion process and an application method thereof. In a double-screw reaction extruder, low-polymerization-degree urea-formaldehyde undergoes a polycondensation reaction to generate urea-formaldehyde having a relatively high molecular weight, and under the strong shearing action of the extruder, cellulose having a large number of exposed active hydroxyl groups undergoes a nucleophilic substitution or condensation reaction, so that urea-formaldehyde macromolecules generated in situ are grafted onto macromolecular chains thereof; and -COOH of citric acid and -OH of cellulose simultaneously undergo a cross-linking reaction. By means of the polycondensation-grafting-crosslinking three-in-one reaction extrusion process, a cellulose / urea-formaldehyde compound is generated, thereby obtaining the cellulose / urea-formaldehyde water-retaining slow-release fertilizer granules in one step. By modifying urea-formaldehyde with hydroxyethyl cellulose, the strong intermolecular and intramolecular hydrogen bonding can enhance the mechanical properties of the urea-formaldehyde fertilizer, and the long molecular chains and abundant hydrophilic groups can also significantly improve the water absorption and water retention performance of the fertilizer.

The invention provides low-viscosity high-wear-resistance vehicle engine oil and a preparation method thereof, and belongs to the technical field of engine oil. According to the preparation method, an ionic liquid group is introduced through a reaction, a nano interlayer compound is constructed by combining surface modification of a metal-ionic liquid complex and silicon dioxide nanoparticles, and a microcapsule structure is formed through coating of a urea-formaldehyde prepolymer; the ionic liquid group provides a low friction coefficient and thermal stability, the silicon dioxide nanoparticles provide physical isolation and wear-resistant protection, and the microcapsules realize controlled release and dynamic repair of the lubricating components; a skeleton polymer is prepared through a reaction of polyamidoamine and epoxy chloropropane so as to provide abundant active sites, and oxidation resistance is improved through a synergistic effect of the skeleton polymer, hindered phenol and calixarene; by combining oleic acid modified nanoparticles, the dispersity and the wear resistance are enhanced, and meanwhile, dynamic protection is provided on a friction interface; the synergistic effect prolongs the service life of the engine oil and improves the high-temperature stability of the engine oil.

The invention relates to a high-strength urea-formaldehyde glue and a preparation method thereof, and belongs to the technical field of resin adhesives, the high-strength urea-formaldehyde glue comprises formaldehyde with the mass concentration of 46-52%, urea, melamine, organic montmorillonite powder and modified cellulose nanocrystals, the molar ratio of formaldehyde to urea is 0.8-1.05, the adding amount of melamine is 2-10% of the mass of urea, the adding amount of organic montmorillonite powder is 1-5% of the mass of modified cellulose nanocrystals, and the adding amount of organic montmorillonite powder is 1-5% of the mass of modified cellulose nanocrystals. The use amount of the organic montmorillonite powder is 1-2% of the mass of the urea, and the use amount of the modified cellulose nanocrystals is 2-3% of the mass of the urea. On the basis of adopting a high-concentration formaldehyde material, the organic montmorillonite powder and the modified cellulose nanocrystals are added, so that the performance of the urea-formaldehyde resin is further improved, and the strength and the water resistance of the urea-formaldehyde resin are improved.

The invention relates to the technical field of shaving boards, and discloses a preparation method of an anti-deformation moisture-proof shaving board and the shaving board, the preparation method comprises the following steps: S1, sorting: sorting to obtain surface layer fine materials and core layer wood shavings; s2, glue applying, wherein urea-formaldehyde glue I is applied to the surface layer fine materials, and urea-formaldehyde glue II and MDI glue are applied to the core layer wood shavings; the urea-formaldehyde glue I and the urea-formaldehyde glue II are both melamine modified urea-formaldehyde glue; s3, moisture prevention is conducted, specifically, a waterproof agent and a mildew preventive are applied to the surface layer fine materials and the core layer wood shavings correspondingly, and then a curing agent is applied to the core layer wood shavings; s4, paving is conducted, specifically, laminated paving is conducted according to surface layer fine materials, core layer wood shavings and surface layer fine materials, and a plate blank is obtained; and S5, hot pressing, wherein the plate blank is subjected to hot pressing. Melamine modified urea-formaldehyde glue is adopted for sizing, different sizing processes are adopted for the surface layer and the core layer, the wood shaving units are tightly glued together, and the shaving board good in humidity resistance and size stability is prepared.

A urea-formaldehyde microcapsule shell surface modification method beneficial to toughening of an epoxy composite material. The method comprises: uniformly mixing polyvinyl alcohol powder with deionized water to obtain a surfactant aqueous solution; mixing deionized water with the surfactant aqueous solution, then adding urea, ammonium chloride, and resorcinol, stirring the mixture, dropwise adding a diluted hydrochloric acid solution to adjust the pH, and stirring the mixture to obtain a stable emulsion; adding a formaldehyde-urea mixed solution to the stable emulsion and stirring and heating the mixture; after the heating reaction is completed, cooling the mixture to room temperature, and carrying out vacuum filtration, washing with deionized water, filtration, and then vacuum drying to obtain a urea-formaldehyde microcapsule shell; and mixing 3-aminopropyltriethoxysilane with deionized water, dropwise adding a diluted hydrochloric acid solution to adjust the pH to obtain a modified solution, adding the urea-formaldehyde microcapsule shell to the modified solution, stirring the mixture, and then carrying out vacuum filtration and drying to obtain a urea-formaldehyde microcapsule shell with the surface modified.

The invention discloses a self-repairing polyurethane blade anticorrosive coating and a preparation method thereof. The self-repairing polyurethane blade anticorrosive coating is prepared from a polyurethane prepolymer, self-repairing microcapsules, nano SiO2 powder, a gamma-aminopropyl silane coupling agent, a UV absorbent and a dibutyltin distearate catalyst. The self-repairing microcapsule is a double-layer gradient shell, an outer-layer high-crosslinking urea formaldehyde-borate shell provides fatigue resistance, an inner-layer low-crosslinking urea formaldehyde-polyester shell is easy to break, and a repairing agent is released once a crack occurs; a reversible dioxane cross-linking bond is introduced into the polyurethane prepolymer, so that closed regeneration after network breakage is realized; acoustic emission and electrochemical impedance monitoring, a PLC dynamic adjustment process and a formula-process closed loop construction process are built in a preparation-curing stage, so that the repair agent release and network closing are triggered once microcracks are generated, the completeness and stability of a coating are kept under complex working conditions, the anti-corrosion service life is remarkably prolonged, and the production consistency is improved.

A preparation method for a urea-formaldehyde microcapsule, comprising: uniformly mixing an emulsifier, urea, ammonium chloride, resorcinol and deionized water, adjusting the pH value, defoaming, adding dicyclopentadiene to form an emulsion, after stabilization, adding a formaldehyde solution and paraffin oil, covering and heating the emulsion for polymerization, and cooling and washing to obtain a urea-formaldehyde microcapsule.

The invention discloses a preparation method and application of a polypyrrole-urea resin cross-linked photo-thermal energy storage phase change microcapsule, and aims to solve the problems that an existing photo-thermal conversion material and a phase change energy storage material are compounded, interface bonding between the photo-thermal conversion material and the phase change material is not firm and the like. The preparation method comprises the following steps: 1, pretreating a pyrrole monomer and a phase change material; 2, mixing a phase change material and a pyrrole monomer to prepare an oil phase, and adding the oil phase into the water phase to obtain a water-in-oil emulsion; 3, mixing a ferric chloride solution with the urea formaldehyde prepolymer solution, adjusting the pH value of the system to 3-4, and dropwise adding the mixed solution into the water-in-oil emulsion to obtain a reaction solution; 4, heating and carrying out a cross-linking reaction; 5, blocking and stabilizing; and 6, washing and drying. According to the preparation method disclosed by the invention, simultaneous coating of polypyrrole and urea-formaldehyde resin is realized through a one-step method cooperating with in-situ polymerization, the two polymers form an interpenetrating network structure on an oil-water interface, and the special structure remarkably improves the mechanical strength and thermal stability of the microcapsule.

The invention relates to a composite sponge for an automobile engine hood and a preparation method of the composite sponge. The composite sponge is prepared from the following components in parts by weight: 100 to 130 parts of polyurethane prepolymer, 20 to 30 parts of bismaleimide and furyl polyether copolymer, 12 to 20 parts of 6-(diphenoxy phosphine)-6H-dibenzoxphosphine or a derivative thereof, 12 to 20 parts of ammonium polyphosphate, 8 to 15 parts of nano silicon dioxide or montmorillonite, 12 to 20 parts of self-healing microcapsule, 1 to 3 parts of azodicarbonamide and 1 to 2 parts of zinc stearate. And 5 to 8 parts of a diisocyanate crosslinking agent. Wherein the self-healing microcapsule takes an aromatic ester or epoxy prepolymer as a core material and a urea formaldehyde condensate as a shell material, and the particle size is 20-80 microns. All the components are compounded under a specific process path to form a foam network structure with high-temperature shape memory and self-healing functions and efficient flame retardance, and the foam network structure is suitable for thermal protection application of an automobile engine compartment under complex working conditions.

The invention relates to the technical field of fertilizer production and industrial solid waste resource utilization, and particularly discloses a method for producing a urea formaldehyde polyglutamic acid compound fertilizer from phosphorus and potassium mixed acid raffinate. According to the method, phosphorus-potassium mixed acid slurry, polyglutamic acid and urea formaldehyde are used as main raw materials, and the preparation method comprises the steps of raw material reaction and mixed acid preparation, multi-stage neutralization and functional agent mixing, slow-release nitrogen source mixing, returned material pretreatment and granulation, screening and wrapping, process waste heat recovery and the like. The product disclosed by the invention can be applied as a special compound fertilizer with nutrient slow release and biological stimulation functions, and has the advantages of balanced nutrients, high utilization rate and capability of improving soil. Besides, according to the preparation method, high-valued resource utilization of the phosphorus-potassium mixed acid raffinate is achieved, and through ammoniation pretreatment of returned materials and systematic recovery of reaction waste heat, the preparation method has the advantages that the raw material cost is reduced, the product performance is improved, and the production energy consumption is reduced.

The application relates to a composite film material, a urea-formaldehyde product and a preparation method thereof, and a toilet bowl. The composite film material comprises a modified film material, the modified film material comprises a reinforcing cloth and a PVB matrix coated on the surface of the reinforcing cloth and filled in the reinforcing cloth, the total thickness of the modified film material is 0.1mm-2mm, the modified film material is provided with a plurality of through holes arranged in the thickness direction, and the diameter of each through hole is 1mm-5mm; the grammage of the reinforcing cloth is 10g / m 2 ~120g / m 2 ; the material for preparing the PVB matrix comprises PVB 85-92 parts and a plasticizer 8-15 parts in mass fraction, the total mass fraction of the PVB and the plasticizer is 100 parts, and the viscosity of a 10% PVB ethanol solution at 20 DEG C is 30s-120s. The composite film material has high hardness and high impact resistance, is applied in the urea-formaldehyde product, and is favorable for improving the impact resistance of the urea-formaldehyde product.

The application discloses a kind of high activity catalyst and utilize the catalyst in aqueous phase 5-hydroxymethylfurfural one-step hydrogenation preparation 2,5-tetrahydrofuran dimethyl alcohol method.The catalyst described in the application directly introduces nickel salt into furfuryl alcohol urea formaldehyde resin, then the obtained resin is calcined under hydrogen atmosphere to obtain metallic nickel-based catalyst, because the catalyst has excellent affinity with HMF, HMF can be selectively prepared THFDM under relatively mild reaction conditions in aqueous phase, and the yield of THFDM is up to 93%.The catalyst preparation process of the application is simple, the hydrogenation reaction condition is mild, the yield of THFDM is high, and HMF crude product aqueous solution can be used as substrate, and it has good industrial application prospect.In addition, HMF has good water solubility, considering the principles of green and sustainable chemistry, water is used as reaction medium, compared with expensive organic solvent, the post-processing cost can be greatly reduced.

The present invention belongs to the technical field of wear-resistant coatings, and specifically provides an impact-resistant wear-resistant coating and a preparation method thereof. Among them, the impact-resistant wear-resistant coating contains the following components in parts by weight: 70-90 parts of copper alloy, 10-30 parts of urea-formaldehyde microcapsules, 5-10 parts of organic compounds, 0.1-2 parts of silane coupling agent, 60-100 parts of organic solvent, 0.2-2 parts of inhibitor, and 0.3-1 part of photocatalyst. The present invention uses copper alloy and urea-formaldehyde microcapsules for component design, enhancing the impact resistance and wear resistance of the coating. When cracks appear, the urea-formaldehyde microcapsules release the healing agent to achieve self-repair of the coating. The formed superhydrophobic film accelerates the self-repair of the coating and realizes self-cleaning of the coating. Together with the urea-formaldehyde microcapsules, it increases the corrosion resistance of the coating, effectively solving the problem that the coating in the prior art is difficult to simultaneously possess the functions of impact resistance, wear resistance, self-repair, self-cleaning and corrosion resistance.

The invention belongs to the technical field of melamine modified urea-formaldehyde rubber powder, and particularly relates to ENF-grade melamine modified urea-formaldehyde rubber powder as well as a preparation method and application thereof. The ENF-grade melamine modified urea-formaldehyde rubber powder is prepared from the following components in parts by weight: 50 to 60 parts of urea, 90 to 110 parts of a formaldehyde solution, 10 to 15 parts of melamine, 0.2 to 0.5 part of hyperbranched polyglycerol and 10 to 20 parts of a cellulose porous material. The specific hyperbranched polyglycerol and cellulose porous material are adopted, under the specific preparation method, the melamine modified urea-formaldehyde glue powder with the low free formaldehyde content can be obtained, the formaldehyde emission of the prepared plywood is smaller than 0.025 mg / m, the ENF-level requirement is met, and meanwhile the plywood has the excellent bonding strength and water resistance.

The invention discloses a flame-retardant polyester modified urea-formaldehyde adhesive as well as a preparation method and application thereof, and belongs to the technical field of wood processing and artificial board adhesives. The preparation method comprises the following steps: mixing glycerol and maleic anhydride, and carrying out first heating reaction to obtain a polyester prepolymer; mixing the polyester prepolymer and glycerin, and carrying out a second heating reaction to obtain functionalized hyperbranched polyester; dissolving the functionalized hyperbranched polyester in acetonitrile, then adding phenylphosphoryl dichloride for reaction, heating and stirring for reaction, and removing the solvent and byproducts after the reaction is finished to obtain hyperbranched flame-retardant polyester; and uniformly mixing the hyperbranched flame-retardant polyester aqueous solution, urea-formaldehyde resin and water to obtain the modified urea-formaldehyde adhesive. Through an innovative strategy of'structural design-chemical bonding ', the long-standing core contradiction that'flame retardance-performance' is difficult to consider in urea resin flame-retardant modification is successfully solved, an efficient and durable flame-retardant modification solution with excellent comprehensive performance is provided, and the industrial application value is significant.

This invention discloses a supported anti-sulfurization reducing agent and its preparation method, relating to the technical field of rubber additives. A supported anti-sulfurization reducing agent includes an adhesive layer and an inner capsule. The adhesive layer is formed by blending a carrier rubber and a fatty acid salt. The inner capsule includes a core material and an inner capsule wall. The core material is the anti-sulfurization reducing agent, while the inner capsule wall is formed by reacting and curing an amino-modified liquid isoprene rubber and a urea-formaldehyde prepolymer. This application, by using microencapsulation, prepares an anti-sulfurization reducing agent with a double-layered supported structure. This not only effectively improves the problems of poor compatibility and difficult dispersion of pure anti-sulfurization reducing agents in rubber compounds, but also effectively protects the active ingredients, which is beneficial for improving the actual utilization rate of the anti-sulfurization reducing agent, reducing the amount of anti-sulfurization reducing agent added, and thus reducing the production cost of rubber products.

The present invention discloses an organic carrier for the front silver paste of a crystalline silicon solar cell and a preparation method thereof, belonging to the technical field of solar cells. The organic carrier is composed of the following components in weight ratio: 6%-9% of resin, 87-92% of organic solvent, 1-3% of thixotropic agent, 0.1-1% of leveling agent, and 0.3%-1% of adhesion promoter; the resin is composed of resin A and resin B, and the resin A is at least one of melamine formaldehyde resin, nitrocellulose, urea formaldehyde resin, and nitrogen-containing phenolic resin, and the resin B is at least one of acrylic resin, ethyl cellulose, hydroxypropyl cellulose, butyl acetate cellulose, and PVB resin. The organic carrier of the present invention is used to prepare the front silver paste of a crystalline silicon solar cell, and the obtained front silver paste has excellent printing performance, the grid line is linear and full, and the aspect ratio is greater than 0.55.

This invention relates to the field of adhesive technology and discloses an anti-aging phenolic resin-based urea-formaldehyde adhesive and its preparation method. The adhesive is composed of 95-100 parts phenol, 120-160 parts 37% formaldehyde solution, 80-110 parts urea, 3-4.5 parts modifier, 1.5-1.8 parts curing agent, and 1.8-2.2 parts anti-aging agent. The preparation method includes four steps: preparation of phenolic resin prepolymer, preparation of urea-formaldehyde resin prepolymer, composite modification, and post-treatment. This invention, through the synergistic effect of composite modification and anti-aging agent, solves the defects of traditional urea-formaldehyde adhesives, such as high formaldehyde release, poor anti-aging performance, and insufficient water resistance, while possessing excellent environmental friendliness, adhesion, and durability, making it suitable for fields such as the production of engineered wood products.

The invention relates to the technical field of drilling fluid cooling, and discloses a drilling fluid cooling composite polyol phase change microcapsule and a preparation method thereof.The drilling fluid cooling composite polyol phase change microcapsule comprises a composite phase change material core material and a composite high-molecular polymer wall material, and the composite phase change material core material comprises composite polyol, paraffin, fatty acid, polyester, polyethylene glycol, silicone oil and fluoride; the composite high-molecular polymer wall material comprises polyurea, polyamide, polyurea formaldehyde, polymethyl methacrylate and polystyrene, and the composite phase change material core material and the composite high-molecular polymer wall material in the microcapsule have high phase change latent heat and thermal stability and can effectively absorb and release heat, so that cooling of the drilling fluid is achieved, and the drilling fluid is prevented from falling off. The cooling effect of the drilling fluid is improved, the drilling efficiency is improved, and normal production of enterprises is met.

The application discloses a urea-formaldehyde composite material and a preparation method and application thereof, wherein the urea-formaldehyde composite material comprises urea-formaldehyde particles and a toughening agent, and the toughening agent is an acetal polymer. The urea-formaldehyde composite material can realize anti-cracking of urea-formaldehyde products without changing ceramic texture and high hardness of urea-formaldehyde material, and the preparation process of the urea-formaldehyde composite material is simple and easy to carry out large-scale production.

The invention discloses a modified urea-formaldehyde glue preparation process and a waste gas purification treatment device thereof, and the modified urea-formaldehyde glue preparation process comprises the following steps: S1, raw material pretreatment; s2, intelligent monitoring preparation is carried out; s3, carrying out addition reaction; s4, polycondensation reaction; s5, modifying; and S6, carrying out post-treatment. A waste gas purification treatment device for modified urea-formaldehyde glue preparation comprises a base, a pretreatment tank, a filtering tank, a pre-filtering assembly and a pre-cooling assembly, the pretreatment tank and the filtering tank are both fixed to the base, the upper ends of the pretreatment tank and the filtering tank are communicated through a gas guide pipe, the lower end of the pretreatment tank is provided with a gas inlet, and the lower end of the filtering tank is provided with a gas outlet; and a filter element is arranged at the bottom in the filtering tank. The waste gas treatment device provided by the invention adopts dual pretreatment of pre-filtering and cooling, and is matched with a self-cleaning mechanism to reduce the maintenance cost, a circulating cooling system saves energy, meanwhile, the formaldehyde removal rate is greatly improved by three-dimensional rotary spraying, and high-efficiency and low-consumption environment-friendly production is realized.

The invention relates to the technical field of epoxy resin adhesives, and discloses a waterproof epoxy resin-based urea-formaldehyde adhesive and a preparation method thereof, and the waterproof epoxy resin-based urea-formaldehyde adhesive comprises the following components by weight: 50-60 parts of urea-formaldehyde resin, 15-20 parts of bisphenol A epoxy resin, 1-1.5 parts of a filler, 1-1.5 parts of a waterproof agent, 1-1.2 parts of an auxiliary agent, and 2-3 parts of diethylenetriamine. According to the waterproof agent, 4-nitrodichlorophenyl phosphate and perfluorohexyl ethyl alcohol serve as raw materials, fluorine-containing groups are introduced through two-step reaction, fluorine-containing chain segments have extremely high hydrophobicity, a surface hydrophobic layer can be formed after the urea-formaldehyde glue is cured, water molecule permeation is hindered, good waterproof performance is achieved, meanwhile, the urea-formaldehyde glue has good flame retardance, and the waterproof performance is good. And the self-repairing effect is achieved.

The utility model relates to the technical field of urea formaldehyde compound fertilizer production, and discloses a urea formaldehyde preparation system, which comprises a reaction tank and an intermediate tank, the reaction tank is communicated with a water inlet pipe, an air inlet pipe, a feed inlet and a liquid outlet pipe; a first conveying pump is arranged on the liquid outlet pipe; the other end of the liquid outlet pipe is communicated with a middle tank, the middle tank is communicated with a discharging pipe, a second conveying pump is arranged on the discharging pipe, a plurality of spray heads are arranged at the other end of the discharging pipe, and the spray heads extend into a secondary dryer or a granulator. According to the scheme, urea and formaldehyde react to form the urea formaldehyde solution, and then the urea formaldehyde solution is sprayed on the surface of the compound fertilizer to form the urea formaldehyde slow-release compound fertilizer, so that the coating uniformity of urea formaldehyde on the surface of the compound fertilizer is effectively improved, and the slow-release uniformity of the urea formaldehyde compound fertilizer is improved.

The invention discloses a slow-release liquid fertilizer and a preparation method thereof, and belongs to the technical field of fertilizers. The preparation method comprises the following steps: S1, mixing and stirring urea and a formaldehyde solution for reaction to prepare monomethylol urea and dimethylol urea; s2, pyrophosphoric acid is added into a reaction product in the S1, stirring reaction is continued, and a urea formaldehyde pyrophosphate monoester compound is prepared; and S3, firstly adding a potassium source into the reaction product in the S2 for reaction, and then adding a stabilizer for reaction again to obtain the product. The urea, the formaldehyde, the pyrophosphoric acid and the potassium source are used as preparation raw materials for preparing the slow-release liquid fertilizer, and the preparation method is simple, mild in condition, high in preparation efficiency and suitable for large-scale industrial production; the prepared slow-release liquid fertilizer has an excellent nitrogen fertilizer and phosphate fertilizer slow-release effect, has comprehensive and balanced nutritional value, can effectively promote the growth and yield increase of crops, has long-acting storage stability, and solves the problems that a traditional fertilizer is low in chemical fertilizer utilization rate and easily causes many environmental damages during use.

The invention discloses a modified montmorillonite-based lubricant and a preparation method thereof, and belongs to the technical field of lubricants, oleic acid and diethylenetriamine are cyclized and quaternized to prepare an oleic acid-based imidazoline quaternary ammonium salt corrosion inhibitor, the oleic acid-based imidazoline quaternary ammonium salt corrosion inhibitor is used for organic modification of nano montmorillonite, a silane coupling agent is further adopted for silanization treatment, and the modified montmorillonite-based lubricant is prepared. The preparation method comprises the following steps: preparing silane modified corrosion-inhibition montmorillonite, carrying out in-situ polymerization coating by taking a urea-formaldehyde prepolymer as a wall material to form montmorillonite modified corrosion-inhibition microcapsules, and carrying out copolymerization on acrylic acid, N, N-bis (2-hydroxyethyl) aminomethylene diethyl phosphonate and trifluoromethacrylate to obtain the modified polyacrylate dispersant with heat-resistant and dispersion-stable functions. The microcapsule, a dispersing agent, dibasic acid ester oil, PAO base oil and an antioxidant are compounded in proportion to form the modified montmorillonite-based lubricant.

The present invention relates to the technical field of slow / controlled-release chemical fertilizers, in particular to an integrated preparation process and application method for a urea-formaldehyde-based multi-nutrient biodegradable polymeric slow / controlled-release liquid fertilizer and granular fertilizer. The preparation method comprises the following steps: first, preparing a hydroxymethyl urea solution, then adding a portion of the obtained hydroxymethyl urea solution into a reactor for preparing a liquid fertilizer, and finally obtaining a polymer slow / controlled-release liquid fertilizer; feeding the remaining portion of the obtained hydroxymethyl urea solution into an integrated reaction-extrusion machine, generating a urea-formaldehyde polymer by means of polycondensation reactive extrusion in a double-screw reactive extruder of a reaction unit of the integrated reaction-extrusion machine, and finally obtaining a polymeric slow / controlled-release granular fertilizer. The present invention allows for the simultaneous production of a urea-formaldehyde-based multi-nutrient biodegradable polymeric slow / controlled-release liquid fertilizer in two different forms, namely, a liquid form and a solid, granular form, using a single set of equipment, and the process is simple and environmental-friendly.