235results about How to "Prevent self-aggregation" patented technology

The invention relates to a ceramic material for 3D light curing formation printing and a preparation method of a ceramic element. The ceramic material is prepared from 30 to 70 vol percent of ceramicpowder and 30 to 70 vol percent of photosensitive resin premixed liquid, wherein the photosensitive resin premixed liquid is prepared from 37 to 50 weight percent of oligomers, 30 to 60 weight percentof reactive diluents, 0.1 to 5 weight percent of photoinitiators, 1 to 5 weight percent of dispersing agents, 0.1 to 0.6 weight percent of ultraviolet blocking agents, 0 to 0.05 weight percent of polymerization inhibitors, 1 to 4 weight percent of anti-foaming agents, 0.5 to 2.35 weight percent of anti-settling agents and 0.3 to 3 weight percent of leveling agents. In the degreasing and sinteringpost-treatment work procedures, specific parameters are used, so that a sintering element can reach good sintering density and mechanical performance. By optimizing the composition and the proportionof light curing ceramic resin, and selecting the excellent dispersing agent combination and the reasonable consumption, the ceramic powder can be better dispersed in the resin; the problems that theexisting light curing ceramic resin has poor flowability and low formation precision, and that a finally prepared ceramic product can easily generate cracks or deformation, and the like are solved.

The invention discloses a polymerization inhibitor suitable for a vinyl aromatic compound, which can be applied in the processes of production, treatment, transportation and utilization of vinyl aromatic compounds. The compounded polymerization inhibitor is composed of an oxime compound, a nitrophenol compound and a nitroxide free radical compound and skilfully utilizes the respective advantages of a true polymerization inhibitor and a retarder; the synergy of components obviously improves inhibition effect, reduces use amount of highly toxic substances, lowers toxicity, improves solubility in the organic solvent and obtains good economic benefit.

The invention relates to a combined isoprene rectification and separation method, mainly aimed at solving the problems in prior art that when to separate and crack the diolefin in c_5 fraction, the raw materials have to enter a thermal dimerization reactor first, resulting in great losses of isoprene and cyclopentadienyl, and that because the boiling points of isoprene and cyclopentadienyl are nearly the same, the cyclopentadienyl affects the purity of the product isoprene and a part of cyclopentadienyl is lost, and particularly the problem that the isoprene knockout tower has high temperature and is energy-consuming. The invention makes the c_5 materials enter the isoprene knockout tower2 from the middle; after separation, material flow I containing isoprene comes out from the top of the tower and the material flow II containing cyclopentadienyl comes out from the bottom of the tower for later processing. Then the material flow I enters the cyclopentadienyl recycling tower from the middle part, after separation the material flow III coming out from the top of the cyclopentadienyl recycling tower enters the follow-up isoprene refining process and the cyclopentadienyl material flow coming out from the bottom of the cyclopentadienyl recycling tower circulates to the middle part of the isoprene knockout tower2. With such technique proposal, the invention solves the problems, thus the invention can be applied to the industrial production of separating the diolefin in c_5 fraction.

The invention relates to a preparation method of lithium ion battery anode slurry. The method comprises the following steps: a. weighing anode slurry, an active material, a conductive agent, a thickener, a binder, a solvent and a surfactant in the lithium ion battery anode slurry ratio; b. mixing the thickener with the solvent in the raw materials, adding the conductive agent to the mixed solventafter full stirring, and continuing stirring the mixture uniformly; c, adding the surfactant to the mixture of step b, performing stirring, adding the active material in three batches, and fully stirring the mixture again for 1. 5 h to obtain slurry a with uniform appearance; d, adding the binder to the slurry a, and adjusting the viscosity of the slurry with the solvent in the stirring process toobtain the lithium ion battery anode slurry. With adoption of a step-by-step wet mixing process, the anode slurry is dispersed evenly, the conductive agent SP and the active material form a mutuallydispersed interlocking microstructure, stability is good, settling is not likely to occur, and peel strength of a prepared pole piece is significantly improved compared with that of a pole piece prepared with the traditional process.

The invention relates to a preparation method of multiple response core-shell structure magnetic nanometer aquagel photonic crystals. The method comprises the following steps that NIPAM, crosslinkingagents, emulsifying agents and initiators are mixed for reaction to obtain PNIPAM; dilution is performed by de-ionized water; crosslinking agents, AA, initiators and catalysts are sequentially added for continuous stirring and reaction; PNIPAM/PAA of an IPN structure is obtained; concentration is performed to 1/2 of the original mass concentration; reaction is performed with Fe<2+>, NaNO2 and ammonia water to obtain IPN/Fe3O4; NIPAM, crosslinking agents and initiators are added for reaction to obtain PNIPAM@(IPN/Fe3O4); concentration is performed to 2 to 8 weight percent; self assembly is performed to obtain the multiple response core-shell structure magnetic nanometer aquagel photonic crystals. The method has the advantages that the process is simple; the raw materials can be easily obtained; the green and environment-friendly effects are achieved; the prepared product has the core-shell structure and the temperature/pH/magnetic triplex response performance; great application prospects are realized in the fields of optics and biomedicine.

The invention discloses an electrode material. The chemical composition of the electrode material is LixMe1yMe2a(RO4)z, wherein Me1 is one of or composition of at least two of Mn, Fe, Ni, Co or V, Me2 is one of or composition of at least two of Mg, Mn, Cr, Ni or Al, R refers to P or/and Si, 1</=x</=4, 1</=y</=3, 1</=z</=5, and 0</=a</=0.2. The invention further discloses a preparation method of the electrode material. Small particles in solution uniformly wrap surfaces of large particles under the interaction of positive and negative charges of anionic dispersants and cationic dispersants, self-aggregation of the particles is avoided, the wrapping state cannot be destroyed in a precursor forming process, and the obtained electrode material is fine and uniform in crystal particle and good in electrical conductivity and cycle performance and is coated with a thin carbon layer on the surface.

The invention discloses a method for directly synthesizing polyoxymethylene dimethyl ether by taking dilute formaldehyde and methylal as raw materials. The method comprises the following steps: directly mixing dilute formaldehyde and methylal, removing the moisture through a membrane separation process, and carrying out a condensation reaction, thereby obtaining the polyoxymethylene dimethyl ether. According to the method disclosed by the invention, the membrane separation dehydration process and the catalytic condensation reaction are efficiently coupled, the polyoxymethylene dimethyl ether is directly synthesized by taking the dilute formaldehyde and methylal as raw materials, and the method achieves the effects of investment conservation and low cost and has high comprehensive benefits in technical economy.

The invention provides a dentin reactive monomer mixture and a preparing method, a polycarboxylic oligomer and a preparing method, and dental composite resin bonding systems, wherein the dentin reactive monomer mixture and the polycarboxylic oligomer are used for constructing the dental composite resin bonding systems. The invention further provides a single-component dental composite resin bonding systems and a double-component dental composite resin bonding system. The bonding systems overcome the defect that due to the fact that a large number of hydrophilic monomers are introduced into a traditional wet bonding technique, cured resin can be easily degraded by esterase in saliva as the water absorption rate is increased remarkably.

The invention provides a preparation method of a viscosity-reducing type polycarboxylate water reducer. The viscosity-reducing type polycarboxylate water reducer is obtained by free radical polymerization of TPEG monomers, unsaturated dibasic acid monomers or derivative monomers thereof, and viscosity-reducing assistants according to the mole ratio of 1:(3-6):(0.1-0.5) under the action of reducingagents, oxidizing agents and chain transfer agents, wherein the viscosity-reducing assistants are diethanolamide fumarate phosphate. The preparation method has the advantages that the unsaturated dibasic acid monomers or derivative monomers thereof, the diethanolamide fumarate phosphate and the TPEG monomers are subjected to copolymerization, the proportion of polar hydrophilic groups on molecular chains of the TPEG monomers can be increased through two carboxyl groups, introduced into the unsaturated dibasic acid monomers or derivative monomers thereof, and polar groups in the diethanolamidefumarate phosphate, such as ethanol, amide and phosphate groups, the hydrophilic-lipophilic balance of the water reducer is increased, and accordingly, the viscosity reducing effect of the water reducer is improved.

Provided is a method of solubilizing a poorly soluble/insoluble active material through formation of an oligomer composite, in which a structure having a hydrophobic cavity structure is formed by using oligomers derived from two types of hydrophilic natural polymers and a poorly soluble/insoluble component is encapsulated in the cavity structure, and thus, self-aggregation of the poorly soluble/insoluble material is prevented and simultaneously, thermodynamic stability increases to effectively solubilize the poorly soluble/insoluble material. According to the constitution of the present invention, the method may include a first operation of preparing an oligomer composite having a cavity structure formed therein by mixing and dissolving oligomers derived from two types of hydrophilic natural polymers in water, and a second operation of adding a poorly soluble/insoluble material to the oligomer composite to encapsulate the poorly soluble/insoluble material in the hydrophobic cavity structure of the oligomer composite.

The invention relates to a production method of high-nitrile SAN resin. The method comprises the specific steps of (a) mixing acrylonitrile with part of styrene cinnamene to obtain a mixture A, then mixing the mixture A with a circulating material and a condensation circulating material outside a reactor in a static mixer through a metering pump so as to obtain a mixture B, and then continuously leading the mixture B to the reactor; and enabling the rest of the styrene to be pumped into a steam condenser at the top of a reaction kettle through the metering pump, to be in contact with steaming air flows of the reactor, and to be mixed with condensation steam to become a condensation circulating material, and enabling the condensation circulating material to enter the reactor through a static mixer ; (c) polymerizing a reaction mixture at 140-160 DEG C in the reactor for 1.5-2.5 hours so as to obtain an SAN copolymer; and (d) performing two-stage devolatilization in a devolatilization machine, and performing pelleting in a pelletizer, so as to obtain the high-nitrile SAN resin with narrow distribution. According to the high-nitrile SAN resin produced by the method disclosed by the invention, the percentage by mass of acrylonitrile is greater than or equal to 32%, the melt indexes of products are smaller than 6g/10min(230 DEG C, 2.16Kg), and the yellow index of the products is smaller than 12.

The invention relates to a preparation method of a magnetic lignosulfonate adsorbing material, and belongs to the field of material science. The method comprises the following steps: firstly dissolving lignosulfonate into water to form a lignosulfonate water solution, sequentially adding ferrous salt and ferric salt into the solution, and stirring the solution, so as to obtain a uniformly mixed first solution, ensuring that the first solution is in reaction in an ultrasonic condition, dropwise adding an alkaline precipitator during the reaction process, ensuring that the pH value of the solution is greater than 10, so as to obtain a reactant; performing solid-liquid separation on the reactant under the action of magnetic field, and cooling and drying solid phase, so as to obtain the magnetic lignosulfonate adsorbing material. The method has the advantages that the lignosulfonate is compounded with magnetic ferroferric oxide nanometer particles to form the magnetic lignosulfonate adsorbing material, raw materials are low in price and wide in source, the preparation technology is simple, the condition is mild, the quantity of required equipment is small, and industrial production canbe realized.

The invention relates to a preparation method of white carbon black/graphene oxide nano-hybrid filler, the nano-hybrid filler and application of the nano-hybrid filler. The preparation method comprises the following steps: carrying out high-speed grinding and dispersion to prepare stable white carbon black slurry modified by a silane coupling agent; then uniformly stirring and grinding and dispersing the modified white carbon black slurry with a graphene oxide/water suspension solution subjected to high-speed grinding and dispersion and/or ultrasonic treatment; connecting white black carbon and graphene oxide through a bridge effect of the silane coupling agent; and then spraying and drying to prepare the white carbon black/graphene oxide nano-hybrid filler. The nano-hybrid filler is filled into any rubber variety through a traditional melting and blending technology to prepare high-performance tire tread. The preparation method and an application technology of the nano-hybrid filler are simple; and when the nano-hybrid filler is applied to rubber, nano-dispersion of graphene in a rubber matrix can be realized and the limitation of the rubber variety can be broken through, so thata composite material has excellent mechanical property, wet slipping resistance, cutting resistance, properties of delaying dynamic and static crack growth, and the like.

The invention discloses a hydrophobic zirconium-metal organic framework material and a preparation method thereof. The preparation method comprises the following steps: (1) feeding and dissolving zirconium chloride in methanol or DMF (Dimethyl Formamide) according to the molar ratio of 100:1.5-7.0, then adding glacial acetic acid for dissolving to obtain a mixture; (2) feeding the mixture in the step (1) into a ball milling tank to carry out ball milling for 10-30 minutes; (3) after the ball milling in the step (2) is finished, adding terephthalic acid with the amount equal to that of the zirconium chloride, continuing ball milling for 10-30 minutes; and (4) washing a product obtained after the step (3) is finished by using the methanol or the DMF in sequence, centrifuging, filtering, anddrying to prepare the nitrogen-doped zirconium-metal organic framework material. The hydrophobic zirconium-metal organic framework material prepared by adopting chemical and mechanical methods has higher specific surface area and higher hydrophobic property, so that the stronger adsorption force of the hydrophobic zirconium-metal organic framework material for chlorobenzene-aldehyde VOC (VolatileOrganic Compound) organic matters is improved.

The invention discloses a preparation method of soybean oil-based waterborne polyurethane light-cured resin. The preparation method comprises the following steps: adding epoxy soybean oil into a reaction bottle; raising the temperature and stirring; uniformly mixing one of acrylic acid and methacrylic acid, a catalyst and a polymerization inhibitor, and adding a mixture into the reaction bottle; continually raising the temperature of the reaction kettle; after reacting for a period of time, cooling to room temperature to obtain soybean oil-based polyatomic alcohol containing terminal double bonds; adding the soybean oil-based polyatomic alcohol containing the terminal double bonds into a four-opening flask provided with a condensation tube and a thermometer; stirring at low temperature and adding diisocyanate; after reacting for a period of time, adding dihydromethyl propionic acid and 1,4-butanediol; keeping the heat; adding an end blocking agent and reacting; adding a neutralizing agent for neutralizing to obtain a polyurethane pre-polymer; finally, adding de-ionized water and emulsifying to obtain needed resin. According to the preparation method provided by the invention, soybean oil, which is a renewable resource, is utilized and energy source pressure can be alleviated; the polymerization inhibitor is utilized, so that the acrylic acid or the methacrylic acid is prevented from self-polymerization under reaction temperature; the preparation method provided by the invention is simple, efficient, controllable and environment-friendly.

The invention discloses a multi-functional plastic auxiliary agent comprising the components in parts by weight: 80-90 parts of calcium carbonate, 8-10 parts of stearic acid, 3-5 parts of calcined kaolin, 1-3 parts of a lubricant, 0.8-1.5 parts of methyl acrylate, 1-2 parts of organic antimony, 0.5-1 part of sodium carbonate, 1-2 parts of polyethylene wax, and 1-2 parts of silica. Modified calcium carbonate is mixed with the auxiliary agent, so that the particle surface energy and interfacial tension can be greatly reduced, auto-agglutination of micronized particles is effectively prevented, the compatibility of the auxiliary agent in plastics is increased, the macromolecule plasticization is promoted, the product impact degree, stiffness and heat resistance are increased, the melt viscosity is reduced, the liquidity is improved, and the processability of the plastics is increased; and the calcined kaolin is filled into a mixture, and the plasticity of the plastic auxiliary agent is increased.

The invention discloses a film dehydrating method of raw materials used for preparing polymethoxyldimethyl ether. The raw materials comprise a mixture of a formaldehyde solution, methylal and methanol. The mixture flows across the surface of a film in a fluid or steam state, and driven by the water partial pressure of the two sides of the film, water in the mixture selectively penetrates through the separation film. The method is high in efficiency, low in energy consumption, simple in process and convenient to operate.

The invention relates to a method for continuously producing prothioconazole by utilizing a micro-channel reactor and a micro-channel system and belongs to the technical field of organic synthesis processes. The method comprises the following steps: taking 2-(1-chloro-cyclopropyl)-1-(2-chlorphenyl)-3-hydrazino-propyl-2-ol as a raw material, carrying out a cyclization and oxidization two-step reaction in the micro-channel reactor so as to continuously complete a preparation process of prothioconazole, introducing the material into the micro-channel reactor by a metering pump, performing preheating, mixed reaction and quenching crystallization separation so as to obtain the product prothioconazole. According to the method, mass transfer and heat transfer in the reaction process can be enhanced, the reaction temperature and reaction time are accurately controlled, side reactions and a reactant auto-polymerization phenomenon caused by material enrichment in the cyclization process are avoided, and conditions that the side reactions are increased due to 'temperature runaway' and reactive oxygen species overflow in the oxidization process and the like are also avoided. The reaction timeis finally reduced, the atom utilization ratio is improved, the reaction conversion rate is greatly improved, and production of solid wastes and side reactions is reduced.