39results about How to "Adjustable particle size" patented technology

The invention belongs to the technical field of seed emulsion polymerization, relates to a preparation of a high polymer material, and especially relates to a small-particle-size carboxylic styrene-butadiene latex and its preparation method. Technical problems comprising unadjustable particle size, bad mechanical stability, bad chemical stability and the like of latexes in the prior art are solved in the invention. The preparation method which adopts a seed emulsion polymerization technology and adopts butadiene and styrene as monomers comprises the following steps: adding soft water, a seed latex, an electrolyte, a chelating agent and a pH buffering agent; heating; adding functional monomers, unsaturated carboxylic acid, a molecular weight adjustment agent, a composite emulsifier and an initiator; degassing when the conversion rate reaches above 98%; cooling; and synthesizing the carboxylic styrene-butadiene latex. Compared with the prior art, the preparation method of the small-particle-size carboxylic styrene-butadiene latex has the advantages of realization of the adjustment of the particle size of the latex, and simple operation; and compared with present carboxylic styrene-butadiene latexes, the carboxylic styrene-butadiene latex prepared in the invention has the advantages of narrow monodispersion, good fluidity, excellent mechanical stability and excellent chemical stability.

The invention discloses a carbon-coated granularity controllable sphere lithium iron phosphate compound anode material and a preparation method thereof, the steps of the preparation method is as follows: 1) the Fe<3> compound is weighted according to mol ratios as below: 1.95-2.05 of the Fe<3> compound, 1.95-2.05 of lithium source compound, 0.01-0.2 of phosphorus source compound and 2 of carbon source; 2) defined amount water is added into the Fe<3> compound, the lithium source compound, the phosphorus source compound and the carbon source, and is mixed and placed into a stirring grinder for grinding, thus obtaining precursor solution; 3) a precursor solution is granulated by spraying and drying for obtaining yellow precursor solution powder; 4) the precursor solution powder is calcined under the condition of atmosphere protection and is cooled. By adopting the spraying and drying, the obtained sphere powder granularity is evenly distributed and the size of the granularity can be adjustable; glucide is taken as the carbon source, thus achieving the purpose of thinning the particles and improving the product purity and performance; and the synthesis technique is simple, the source of the raw material is wide, thus greatly reducing the manufacturing cost.

The invention relates to a method for preparing nano-zeolite metal-organic framework compounds by a microreactor, and belongs to the technical field of preparation of nano-particles, which is characterized by comprising the following steps of: constructing a microreactor by a porous film; respectively dissolving a metal precursor and an organic ligand in a solvent to prepare a metal precursor solution A and an organic ligand solution B; respectively arranging the metal precursor solution A and the organic ligand solution B at two sides of the film; by a pressure difference of the two sides of the film, uniformly pressing reactants at one side of the film into reactants at the other side of the film through the pores of the film, to generate nano-particles; and centrifuging, washing and drying to obtain the target product. The method for preparing the nano-zeolite metal-organic framework compounds by the microreactor is simple in operation, strong in controllability of particle structure, and is suitable for preparation and industrial production of various nano-zeolite metal-organic framework compounds.

The invention discloses a polyvinylidene fluoride anti-pollution membrane and a preparation method thereof, and belongs to the field of environmental functional membrane materials. The preparation method comprises: (1) self-polymerizing dopamine on the surface of polyvinylidene fluoride powder, and adhering the generated poly dopamine functional layer onto the surface of the polyvinylidene fluoride powder; (2) preparing a poly dopamine modified polyvinylidene fluoride membrane by using a phase conversion method; and (3) depositing a nano-TiO2 functional layer on the membrane prepared in the step (2) through a liquid phase deposition method to prepare the polyvinylidene fluoride anti-pollution membrane. According to the present invention, by combining the strong adhesion and the polyfunctional group of poly dopamine, the ultraviolet resistance and stable chemical performance of polyvinylidene fluoride, and the advantages of hydrophilicity, high photocatalytic activity and the like of nano-TiO2, the polyvinylidene fluoride anti-pollution membrane is developed; and the prepared polyvinylidene fluoride anti-pollution membrane has excellent pollution resistance, and can be used in various membrane separation fields.

The invention discloses a preparation method of a surface enhanced raman spectrum substrate of a gold nanoparticle embellished diamond film. The diamond film has the extreme physicochemical property, the good biocompatibility and chemical stability, and a gold nanoparticle has a surface enhanced raman spectrum effect. The invention provides the surface enhanced raman spectrum substrate of the gold nanoparticle embellished diamond film and a preparation method of the surface enhanced raman spectrum substrate. The surface enhanced raman spectrum substrate is composed of the diamond film and gold nanoparticles embellished on the diamond film, wherein the surface of the diamond film is subjected to activating treatment through an ultraviolet light chemical reaction method, an amidogen is introduced on the surface of the diamond film, and a layer of gold nanoparticles which are uniformly distributed are assembled on the surface of the amidogen-embellished diamond film, so that the surface enhanced raman spectrum substrate material of the gold nanoparticle embellished diamond film with high stability is formed. The surface enhanced raman spectrum active substrate provided by the invention has the advantages that the preparation is simple, the stability is high, the raman enhancing effect is good, and the preparation method is applied to material trace analysis and molecular detection, chemistry and biosensing, biomedicine detection and the like.

The invention relates to a preparation method of ferroferric oxide nanoparticles, relating to the field of preparation of inorganic non-metallic nano materials. The preparation method comprises the steps of: firstly, preparing a mixed dispersion solution of a ferric source and a ferrous source and a dispersion solution of an alkali source, adding the prepared mixed dispersion solution of the ferric source and the ferrous source into the dispersion solution of the alkali source, stirring for reaction for 50-70min to generate black precipitates in a reaction process, delivering reactants to a centrifuger, washing the separated precipitates sequentially with distilled water, a water-alcohol solution and absolute ethyl alcohol, centrifuging, separating and drying to obtain ferroferric oxide nanoparticles. In the invention, a used reaction solvent has the advantages of low cost and no toxicity and harmfulness, can be recycled and has no environment pollution problem; and used equipment is simple, operation conditions are easy to master, and thus, large-scale production is convenient.

The invention relates to a bionic magnetosome loaded with siRNA and a preparation method of the magnetosome, and belongs to the field of chemistry and biomedicine. According to the bionic magnetosome, water-soluble MNC serves as the kernel and is wrapped by a white cell membrane, and siRNA is loaded between the MNC and the white cell membrane; antibodies or peptides with modifying groups can be coupled outside the white cell membrane of the bionic magnetosome in a covalence mode. By preparing MNC, M and MNC:siRNA and mixing an MNC:siRNA solution, an M solution and a buffer solution, the bionic magnetosome is obtained; the white cell membrane of the bionic magnetosome is modified by the peptides or antibodies through the modifying groups, and the bionic magnetosome coupled with the antibodies or peptides is obtained. The MNC in the bionic magnetosome has positive charges, can adsorb siRNA and is wrapped by M for bionics, a focus is reached efficiently and rapidly, and meanwhile immune elimination of organisms is avoided.

The invention relates to a silicon dioxide-based anti-adhesion agent used for a polyolefin thin film and a preparation method thereof. The silicon dioxide-based anti-adhesion agent is suitable for plastic thin film production enterprises. The preparation method includes the following steps of: 1) preparing silicon dioxide sol from tetraethyl orthosilicate under alkaline conditions; 2) adding a surfactant and a proper oil phase organic substance, and stirring the mixture to prepare a micelle with silicon dioxide as a shell layer; 3) adding trimethoxy silane containing an R group and a catalyst to the micelle with the silicon dioxide as the shell layer, and stirring the mixture to prepare silicon dioxide-based microspheres at a certain temperature, wherein the surfaces of silicon dioxide are modified by silane; and 4) drying the microspheres to remove the oil phase to obtain silicon dioxide hollow microspheres. The silicon dioxide-based anti-adhesion agent is a compound having definite structural and molecular formulas and molecular weight, but is a hollow microsphere which has a hierarchical pore structure and is based on silicon dioxide. The anti-adhesion agent can reinforce a plastic thin film and improves creep resistance, wherein a large quantity of micro projections and gaps are formed on the surface of the thin film, thereby increasing roughness of the thin film, reducing friction coefficient and preventing adhesion of the thin films.

The invention relates to a cellulose-polylactic acid amphiphilic drug-loading micelle preparation method and a product thereof, and applications of the product. According to the method, the active aldehyde group of hydroxypropylmethylcellulose is reduced with mercapto-ethylamine to obtain thiol-terminated hydroxypropylmethylcellulose, alkynyl-terminal poly(L-lactic acid) is synthesis by initiatingwith propargyl alcohol through a ring-opening polymerization method, and finally a thiol alkyne click reaction is initiated under ultraviolet light irradiation so as to obtain a series of hydroxypropylmethylcellulose-poly(L-lactic acid) block copolymers with different molecular weights. According to the present invention, the product is the amphiphilic block nano-micelles using hydroxypropylmethylcellulose as the hydrophilic chain segment and using poly(L-lactic acid) as the hydrophobic chain segment; the preparation method has characteristics of wide raw material source, simple process and strong operability; and the obtained product has good popularization and application value in drug controlled slow release carriers, bio-intelligent switches and nano-scale reactors.

The invention discloses a preparation process for non-cleaning carboxyl polystyrene microspheres. The process comprises the following steps: (1) pouring a functional monomer solution into an outer aqueous-phase solution at one time, wherein the functional monomer is one or more selected from acrylic acid, methacrylic acid and ethyl acrylate, performing stirring, and adding an initiator to initiatea polymerization reaction; and (2) when the initiated polymerization is performed for 5 min to 2 h, adding a mixture of styrene and divinylbenzene at one time, performing a reaction for a period of time, performing cooling, and performing filtration to obtain the carboxyl polystyrene microspheres. The particle size and carboxyl content of the carboxyl polystyrene microspheres prepared by the process are controllable, the reaction time is shortened, and no or only a small amount of time is required for post-treatment.

The invention provides an adriamycin nanoparticle with the particle size controllable. The adriamycin nanoparticle is formed by taking polyethylene glycol vitamin E succinate (TPGS) as a core and wrapping the core with polyethylene glycol-adriamycin and poly(isobutene-alt-maleic anhydride)-modified beta-cyclodextrin through self-assembly. The invention further provides a preparation method of the adriamycin nanoparticle. Compared with a traditional nanoparticle prepared through a chemical bond forming and rupturing method, the adriamycin nanoparticle is controllable in particle size, simple in preparation process, mild in reaction condition and capable of easily obtaining the raw materials and has the good biological safety and tissue compatibility.

The invention discloses a method for preparing instant-soluble cationic high molecular weight polyacrylamide by a two-step method. The method comprises the following steps: (1) adding a dispersing agent to a reaction vessel containing a hydrocarbon solvent, and heating the materials to dissolve the dispersing agent; (2) adding 20 to 40% by mass of an acrylamide aqueous solution, a water-soluble initiator, and a cationic comonomer to the reaction vessel and stirring the materials to form a water-in-oil reaction system; (3) introducing nitrogen gas, and removing oxygen in the reaction system; (4) heating the reaction system to a reaction for a period of time to form primary particles of polyacrylamide; 5) adding an alcohol-water mixed solution to the reaction vessel, stirring the materials,and aggregating the primary particles of polyacrylamide to form solid particles similar to a grape bunch structure; and (6) heating and boiling to remove the alcohol and the aqueous solution, and obtaining the instant-soluble high molecular weight polyacrylamide solid. The polyacrylamide obtained by the two-step method has a faster dissolution rate when used, and is not easily agglomerated.

The invention relates to a preparation method of high-purity nickel protoxide. The preparation method comprises the following steps: dechlorinating nickel oxide obtained by spray pyrolysis, and condcuting calcining at high temperature to obtain nickel protoxide powder with higher purity. The preparation method does not generate wastewater, has the advantages of stable technique and high product purity, and can prepare a high-purity nickel protoxide product with a nickel content of 77% or more, a cobalt content of 0.004% or less, an iron content of 0.004% or less, a calcium content of 0.004% orless and a chlorine content of 0.01% or less.

A middle-section cement clinker fine crushing device relates to the technical field of cement processing, aims to solve the technical problem of adjustable material crushing size, and adopts the technical scheme as follows: the middle-section cement clinker fine crushing device comprises a front-section grate bed, a rear-section grate bed and an outer shell, a grinding bed is arranged between the front-section grate bed and the rear-section grate bed; and a roller device is arranged on the upper surface of the grinding bed, the front-section grate bed, the rear-section grate bed, the grinding bed and the roller device are all located in the outer shell, and a gap adjusting device is arranged between the roller device and the grinding bed. Compared with an existing middle-section clinker crusher, materials can be crushed into smaller particles, high-pressure grinding is achieved, and the yield and efficiency are improved; and energy conservation and consumption reduction are realized, the finished product granularity is adjustable on line, the thermal efficiency of a rotary kiln is improved, the calcination of materials in the kiln is facilitated, and the power consumption of clinker grinding is reduced.

The invention relates to the technical field of water treatment and Fenton catalysts, in particular to a porous heterogeneous Fenton catalyst for water treatment. The catalyst is prepared by taking cerium oxide modified mesoporous iron oxide particles, a porous carrier, magnetic hercynite or hercynite, activated aluminum oxide, barium azodicarboxylate particles, a slow-release pore-forming agent, an optional high-temperature binder and other components as main raw materials through the steps of bonding with a bonding solution, granulating, thermally forming, loading and the like. The prepared Fenton catalyst particles have high porosity, catalytic activity and mechanical strength, and are suitable for treating organic wastewater through Fenton reaction.

The invention relates to the technical field of chemical machining machinery, and discloses chemical product grinding equipment capable of adjusting particle size. The equipment comprises an equipment body; a first sliding groove is fixedly formed in the inner side of the equipment body; a first sliding shaft is slidably connected to the inner side of the first sliding groove; the bottom of the first sliding shaft is rotationally connected with a chemical product containing cavity; the inner side of the first sliding groove is slidably connected with a first sliding block; and the end, away from the first sliding groove, of the first sliding block is fixedly connected with a rotating screw rod. A rotating support ascends, a grinding groove ascends to the bottom of a grinding wheel along with the rotating support, the distance of the grinding groove is fixed through a second fixing spring, the grinding groove is kept at the bottom of the grinding wheel, and therefore the effect of adjusting the size of raw materials is achieved, an impact ball moves along with right-left movement of a second sliding shaft so as to impact on the grinding groove, and the raw materials in the grinding groove fall off, so that the effect of conveniently collecting the raw materials is achieved.

The invention discloses a two-step method for preparing instant high molecular weight polyacrylamide. The two-step method comprises the following steps: (1) adding a dispersing agent into a reaction still containing a hydrocarbon solvent, and heating so that the dispersing agent is dissolved; (2) adding 20% to 40% of acrylamide water solution in percentage by weight and a water-soluble initiator into the reaction still in the step one, stirring so that the water solution is dispersed into the hydrocarbon solvent, and thus forming a water-in-oil reaction system; (3) introducing nitrogen, and removing reaction liquid and oxygen inside the reaction still; (4) heating the reaction system until a reaction, and reacting for a period of time to form polyacrylamide primary particles; (5) dropwiseadding an alcohol-water mixed solution into the reaction still, stirring, and gathering the polyacrylamide primary particles by controlling the using amount of the alcohol-water mixed solution and theratio of alcohol to water so as to form solid particles of similar grape cluster structures; and (6) heating until boiling, and azeotropically removing the alcohol and water solution so that the instant polyacrylamide solid with high molecular weight can be obtained. The polyacrylamide obtained through the two-step method is relatively high in solution rate when in use, and is unlikely to cake.