82 results about "Dispersity" patented technology

The invention discloses a self-healing concrete intelligent preparation method and system based on a dynamic optimization algorithm. The method comprises the following steps: S1, feeding: feeding materials to a premixing module by a raw material bin and a repairing agent carrier storage bin; s2, premixing: monitoring the water content of the aggregate fed into the raw material bin in real time by a premixing module, and dynamically adjusting the rotating speed of the premixing module through the water content; s3, gradient stirring: after premixing, feeding the materials into a gradient stirring module, and sequentially stirring; s31, firstly entering a low-speed paddle for stirring, monitoring the stirring resistance moment and the slurry viscosity distribution in real time, and dynamically adjusting the rotating speed of the paddle according to the torque-viscosity relationship; s32, performing ultrasonic homogenization on the materials subjected to low-speed stirring, monitoring the dispersity of each substance in low-speed stirring in real time through an identification camera, calculating the concentration gradient, monitoring the particle size distribution of a carrier at a discharge port of an ultrasonic homogenizer to obtain the particle size of a target aggregate, and dynamically adjusting the ultrasonic frequency according to the particle size of the target aggregate to obtain the target aggregate. And dynamically adjusting ultrasonic power and action time according to the concentration gradient.

A micron-sized speckle preparation method for quasi-in-situ OIM-DIC mesoscopic strain field analysis comprises the following steps: (1) polishing the surface of a sample to be detected to obtain a bright and scratch-free mirror surface; (2) preparing Si powder turbid liquid; (3) dipping speckles of a sample to be detected in the Si powder turbid liquid to obtain micron-sized speckles; and (4) observing and shooting speckle morphology, and if Si particles are uniformly distributed and dispersed, applying the Si particles to quasi-in-situ OIM-DIC mesoscopic strain field analysis. The method is simple, convenient and rapid, low in operation and construction cost, high in practicability, good in particle dispersity, high in precision, more suitable for calculation of a quasi-in-situ OIM-DIC mesoscopic strain field, controllable in preparation process, low in cost and free of damage to the surface of a sample, the definition and stability of speckle characteristics are remarkably improved, DIC mesoscopic micron-scale operation under a quasi-in-situ OIM mechanical test can be effectively achieved, and the method is suitable for large-scale industrial production. And the grain and mesoscopic strain field information is successfully coupled.

The invention discloses an emulsion type collecting agent prepared on the basis of an oil-water two-phase emulsifier phase composition transformation method and a preparation method and application of the emulsion type collecting agent, and the emulsion type collecting agent with the total mass fraction of 100 is prepared from 20-40 parts of an oily collecting agent, 1-5 parts of a W / O emulsifier, 4-10 parts of an O / W emulsifier and a plurality of parts of water. When the emulsion type collecting agent is prepared, the HLB value of a system can be accurately controlled by adjusting the mass ratio of the W / O emulsifier to the O / W emulsifier, the phase transformation process from W / O emulsion to bicontinuous phase and O / W emulsion is achieved, and then the emulsion type collecting agent with excellent performance is prepared. The average particle size of the emulsion type collecting agent is about 0.5 mu m, compared with a traditional oily collecting agent, the emulsion type collecting agent is better in dispersity, smaller in particle size and larger in specific surface area, the collision and adhesion probability of the collecting agent and particles is remarkably increased, and the low-rank coal interface hydrophobic modification effect and the flotation recovery rate are improved.

The present invention is a resist composition containing a hypervalent iodine compound, a carboxy-group-containing polymer, and a solvent, where the carboxy-group-containing polymer includes a repeating unit of a carboxylic acid derivative, represented by the following formula (1), and the polymer has a dispersity Mw / Mn of 1.30 or less, where Mw is a weight-average molecular weight and Mn is a number-average molecular weight measured by gel permeation chromatography. This can provide: a non-chemically amplified resist composition excellent in sensitivity and limiting resolution in photolithography using a high-energy beam; a laminate including the resist composition; a patterning process using the resist composition; and a method for manufacturing the resist composition.

The invention relates to the field of inorganic material preparation, and provides a bismuth hydroxide material and a preparation method thereof. The bismuth hydroxide is sphere-like nano-particles with the particle size of 85-175 nm, the dispersity is good, and the purity exceeds 99.8%. The preparation method comprises the following steps: preparing a micelle solution from a polyethylene glycol-polylactic acid (PEG-PLA) block copolymer, adding bismuth salt into the micelle solution, carrying out a reaction, and carrying out centrifugation, washing and vacuum drying to obtain the product. Due to the unique amphipathy of the PEG-PLA micelle, bismuth ions are uniformly distributed, and the uniformity of particles is improved; the hydrophilic chain segment forms steric hindrance to inhibit particle aggregation; meanwhile, the reaction rate is slowed down, and high-concentration ammonia water is combined to ensure high purity of the product. The method overcomes the problems of uneven particle size and agglomeration in traditional preparation.

To provide a chemically amplified positive resist composition that can give a resist film which has extremely high isolated space resolution, small LER, excellent rectangularity, and on which formation of a resist pattern with suppressed etching resistance or pattern collapse is possible, and a resist pattern forming method using the chemically amplified positive resist composition.SOLUTION: A chemically amplified positive resist composition contains: (A) a base polymer which includes a repeating unit derived from hydroxystyrene or hydroxynaphthalene and a repeating unit derived from hydroxystyrene in which a hydroxy group is protected by acid-labile group or hydroxynaphthalene in which a hydroxy group is protected by acid-labile group, and in which dissolubility to alkali aqueous solution increases by acid action, and a dispersion degree is 1.0 to 1.19; (B) photo-acid generator expressed by the following formula (B); and (C) organic solvent.SELECTED DRAWING: None

The invention discloses a polyaluminum chloride-based flocculant as well as a preparation method and application thereof, belongs to the technical field of preparation of flocculants, and aims at solving the technical problem that the flocculation performance and the stability of a flocculant in the prior art need to be further improved. The surface charges of iron-based particles are adjusted through sodium citrate, so that the problem of particle agglomeration is effectively avoided, the coating uniformity of microgel is improved, and the specific surface area of the material is increased; abundant cation sites are introduced into the trimethylamine modified chitosan, so that the electrostatic adsorption capacity of the microgel on anion pollutants is remarkably enhanced, and meanwhile, the electrical property and the stability of a system are improved; the addition of sodium metasilicate further promotes the modified PAC to form a stable Al-O-Si bridging structure, the material is endowed with good three-dimensional skeleton strength and composite interface stability, the three components cooperate with each other and play key roles in particle dispersity, charge construction and skeleton stability, and finally, an efficient, stable and storable composite flocculation system is constructed.

The invention relates to the technical field of release film materials, in particular to a bimodal nano-system anti-bonding master batch for an MLCC (multilayer ceramic capacitor) base film and a preparation method of the bimodal nano-system anti-bonding master batch. The anti-bonding master batch comprises the following components in parts by weight: 85-98 parts of thermoplastic resin; 1 to 15 parts of a modified inorganic nanoparticle complex; 0.1 to 1 part of an auxiliary agent; the modified inorganic nanoparticle complex is prepared from the following raw materials: a silane coupling agent and an inorganic nanoparticle complex; the inorganic nano particle complex comprises SiO2 and Al2O3, and the inorganic nano particle complex comprises SiO2 and Al2O3; the particle size of the inorganic nano particle complex is 50 to 500 nm. The technical problems that inorganic nanoparticles are poor in dispersity and easy to agglomerate in PET resin are solved through a bimodal nanoparticle compounding and surface modification technology, the surface of the MLCC release film is endowed with ultralow roughness, and the comprehensive performance of an MLCC product is remarkably improved.

The invention relates to a composition and method for manufacture of paper, board, tissue or the like. The composition comprises an amphoteric polymer component, which has a weight average molecular weight of at least 600 000 g / mol, preferably at least 1 000 000 g / mol, more preferably at least 2 000 000 g / mol, and at least one synthetic cationic polymer component, which is a copolymer of a polyamidoamine and has a weight average molecular weight ≤550 000 g / mol, preferably ≤500 000 g / mol, more preferably ≤400 000 g / mol and dispersity index more than 15, preferably more than 20, more preferably more than 25.

The invention belongs to the field of conductive slurry, and particularly discloses a method for detecting the dispersity of slurry particles. The detection method comprises the following steps: centrifuging slurry, sampling from the bottom of the slurry, and forming a film on the obtained sample to obtain a test sample film; spraying metal on the surface of the test sample film, and observing the particle size and the number of large particles in the test sample film by adopting a scanning electron microscope; the centrifugation is as follows: the slurry is centrifuged for 3-12 times by adopting a centrifugal force of 500-3000g, and each time is centrifuged for 10s-7min. The large particles are actively enriched to the bottom of the slurry through centrifugation, and then are directly sampled and observed from the bottom, so that the large particles are more easily captured and analyzed. According to the method, the problems that in a traditional method, due to the fact that large particles naturally sink to the bottom in the drying film forming process and are difficult to be effectively observed by an electron microscope, size misjudgment and number missing detection are caused are fundamentally avoided, and therefore more accurate statistics and characterization of the large particles in the slurry are achieved.

The invention provides a preparation method of rod-like copper powder, and belongs to the field of micro-nano copper powder preparation. The preparation method comprises the steps that a copper salt solution, a dispersing agent and halide ions are mixed to obtain a precursor solution, and the pH value of a reaction system is any one of 8-12; a reducing agent is added into the precursor solution at a preset rate, a reduced copper powder solution is obtained, the pH value of a reaction system is any value in the range of 8-12, and the preset rate is any value in the range of 0.1 mL / min to 3 mL / min; and the reduced copper powder solution is subjected to aftertreatment, and the rod-shaped copper powder is obtained. According to the preparation method, crystals are effectively induced to grow along the specific orientation, the reduction and growth rate is accurately regulated and controlled, and the prepared rod-like copper powder is uniform in morphology, narrow in particle size distribution, good in dispersity and high in purity.

The application relates to the technical field of nanomaterials, and discloses monodisperse nanometer carbonate and a preparation method and application thereof. The method for preparing the monodisperse nanometer carbonate comprises the following steps: (1) performing acid-base neutralization reaction on a calcium source and / or a magnesium source and a surfactant in the presence of an organic solvent; wherein the calcium source is an alkaline calcium source, the magnesium source is an alkaline magnesium source, and the surfactant is an organic acid; (2) mixing water with the product obtained through the acid-base neutralization reaction in step (1); (3) performing first carbonization reaction on the mixture obtained through step (2) and a carbon source a; (4) performing second carbonization reaction on the product obtained through the first carbonization reaction and a carbon source b; wherein the carbon source a is different from the carbon source b. The monodisperse nanometer carbonate particles disclosed by the application are small in particle size, 1-5 nm in size, small in particle size, uniform in particle size distribution, monodisperse, and good in dispersity.

The present invention discloses a method for measuring the dispersion degree of powder materials, which is characterized in that: a dispersion liquid is prepared from the powder materials as the medium for buoyancy measurement, the buoyancy change of the float in the medium is measured, the dispersion force of the dispersion liquid medium is calculated, and the dispersion degree of the powder materials is obtained. The technical solution of the present invention can be applied to the measurement of the dispersion degree of powder materials, including titanium dioxide, clay, kaolin, calcium carbonate, diatomite, silicon dioxide, carbon black, white carbon black, etc. The measurement device has a low cost, the measurement method is simple, the measurement accuracy is high, and continuous and uninterrupted measurement can be achieved to obtain the continuous change value of the dispersion degree of the powder materials over time. The dispersion degree values of the powder materials at different positions in the dispersion system can also be measured simultaneously.

The invention discloses a preparation method and application of a high-dispersity cationic nano sheet covalent organic framework material based on quaternary ammonium salinization. The method comprises the following steps: firstly, successfully synthesizing COF powder by adopting an amino monomer (such as 2, 4, 6-tris (4-aminophenyl)-1, 3, 5-triazine (TAPT) and the like) and an aldehyde monomer (such as 2, 5-dihydroxy terephthalaldehyde (DHTA)) through Schiff base reaction, and then carrying out a reaction on the COF powder and a quaternary ammonium salinization reagent (such as 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (CHPTAC)) to obtain a quaternary ammonium salt product. According to the preparation method, a cationic nano-sheet-shaped COF material with good dispersibility is prepared by taking a reaction in an alkaline solution for quaternization modification and combining with an ultrasonic method, and the nano-sheet is a nano-sheet-shaped cationic polyelectrolyte material with a nano-sheet layer structure and high charge characteristics, is expected to be applied to fiber flocculation and complex water treatment, and has a wide application prospect. And a new scheme is provided for sewage treatment in papermaking industry and chemical industry.

The preparation method comprises the following steps: firstly, adding PEG (Polyethylene Glycol) which accounts for 3% of the mass of an industrial byproduct magnesium chloride solution as a dispersing agent into the industrial byproduct magnesium chloride solution, stirring and dissolving under the ultrasonic action to obtain a mixed solution, then carrying out ultrasonic precipitation reaction, and carrying out ultrasonic precipitation reaction on the mixed solution at constant temperature to obtain the flame-retardant grade magnesium hydroxide. The preparation method comprises the following steps: under the combined action of stirring and ultrasound, dropwise adding ammonia water to carry out a precipitation reaction, then standing and curing the reacted slurry at a constant temperature, and finally carrying out solid-liquid separation, washing, drying and grinding to obtain a flame-retardant grade magnesium hydroxide product, the XRD pattern of the product is consistent with the characteristic diffraction peak of a standard magnesium hydroxide diffraction pattern, the diffraction peak is sharp and has no impurity peak, and the flame-retardant grade magnesium hydroxide product is obtained. The particle size D90 is less than or equal to 1.5 mu m, and the morphology is an irregular sheet structure which is uniformly dispersed. According to the invention, the industrial byproduct magnesium chloride is used as a raw material to prepare the flame-retardant grade magnesium hydroxide with high purity, superfine particle size and good dispersity, and high-valued utilization of the byproduct magnesium chloride is realized.

The invention discloses nano magnetic powder with high dispersity and uniform particle size and a preparation method of the nano magnetic powder, and belongs to the technical field of powder material preparation and treatment. According to the invention, the dispersion medium, the dispersing agent and the wetting agent are added into the nano magnetic powder, so that efficient dispersion of the nano magnetic powder can be realized; meanwhile, the ultrahigh-pressure jet flow homogenization treatment is combined, so that soft aggregates can be thoroughly crushed, and the nano magnetic powder is monodispersed; besides, after the coating agent is used for coating, the magnetic effect can be weakened, secondary agglomeration can be prevented, and the stability of the coating slurry and the nano magnetic powder is remarkably improved; the particle size distribution of the powder can be accurately regulated and controlled by further adopting rotational flow grading treatment, and the nano magnetic powder with uniform particle size distribution is obtained; and the whole preparation process flow realizes integration of dispersing, coating, grading and drying, the process flow system is complete, parameters are easy to control, the method is suitable for large-scale continuous production, and the product performance is stable and reliable.

The invention relates to the technical field of optical material preparation, and provides a polymerizable liquid crystal compound, a polymerizable composition and a phase difference film, a steric hindrance substituent group is introduced to a proper position of a short axis of the polymerizable liquid crystal compound, and the compound shows excellent reverse wavelength dispersity after film forming. Besides, steric hindrance substituent groups are introduced into proper positions of the molecular structure of the polymerizable liquid crystal compound, so that the structural regularity is destroyed, and the compound shows excellent solubility. A phase difference film produced using the polymerizable liquid crystal compound is not susceptible to crystallization and alignment defects.

The invention discloses a color master batch dispersibility detection method based on a rheology principle. The method comprises the following steps: S1, preparing a polymer melt test sample containing a color master batch to be detected and a standard sample with good dispersibility; s2, using a capillary rheometer to obtain the total pressure drop when the sample flows through the capillary; s3, determining inlet pressure drop of the to-be-detected sample and the standard sample; s4, on the basis of the difference between the inlet pressure drop of the to-be-tested sample and the inlet pressure drop of the standard sample, calculating a dispersity index for quantitatively evaluating the dispersion degree of the to-be-tested color master batch. According to the invention, the color master batch dispersibility is improved from qualitative description to quantitative evaluation, and the reproducibility, comparability and high sensitivity of the detection method are ensured.

The invention discloses sedimentation-free and agglomeration-free nano-diamond slurry and a preparation method and application thereof.The sedimentation-free and agglomeration-free nano-diamond slurry is composed of a component A and a component B. The weight percentage of the component A to the component B is 80-95 wt%: 5-20 wt%, the component A is prepared from, by weight, 20-50 wt% of a first organic solvent, 20-50 wt% of a silane coupling agent, 5-20 wt% of a dispersing agent, 5-20 wt% of a permeation promoter and 5-20 wt% of nano-diamond powder, and the component B is prepared from, by weight, 20-50 wt% of a second organic solvent, 5-20 wt% of the content of the silane coupling agent is 2-5 wt%, the content of the dispersing agent is 5-20 wt%, the content of the permeation promoter is 3-10 wt%, the content of the nano diamond powder is 15-70 wt%, and the permeation promoter is selected from at least one of pure Fe powder, pure Co powder, 2% of pure Cr powder and pure CeO2 powder; the component B is prepared from the following raw materials in percentage by weight: 60 to 80 percent of second organic solvent, 10 to 20 percent of resin and 10 to 20 percent of corresponding curing agent. The dispersity and stability of the nano-diamond powder are remarkably improved; the slurry viscosity is optimized, and a simple dip-coating process is realized; a thick hardened infiltrated layer is formed, and the steel hardness is remarkably improved; the process is simple, economical and environment-friendly; and universality and expandability are realized.

The purpose of the present invention is to provide a novel material which exhibits good alkali solubility when irradiated with a high-energy ray and which can be used as a resist material. A novel material according to the present invention is a branched organopolysiloxane which is represented by an average unit formula (1), has a weight-average molecular weight of 2,000 or less, has a polydispersity of 1.30 or less, and has, in the molecule, a hydrophilic group protected by an acid-decomposable functional group: (R3SiO1 / 2) a (R2SiO2 / 2) b (RSiO3 / 2) c (SiO4 / 2) d (O1 / 2Z) e (1), r is a group selected from a monovalent hydrocarbon group or the like and a hydrophilic group protected by an acid-decomposable functional group, and a, b, c, d and e are numbers satisfying the following conditions: 0 < = a, 0 < = b, 0.8 < = c, 0 < = d, 0 < = e, and a + b + c + d = 1).

The invention discloses a multi-element enhanced alginate-based composite film and a preparation method thereof, and belongs to the technical field of polymer composite materials. Through component optimization, hydroxyethyl cellulose is used as a flexible chain segment and forms a physical entanglement network with an alginate matrix through a hydrogen bond; the microcrystalline cellulose is used as a rigid reinforcing phase and is uniformly dispersed in a matrix to form an effective stress transfer skeleton. The tensile strength and the tear resistance of the film are remarkably improved, and the modified porous filler is also added, so that the dispersity is more excellent, and more excellent filling and loading effects are achieved. Besides, a crosslinking solution containing zinc ions is adopted, an excellent crosslinking network can be formed, the stability of the film structure is promoted, under the condition that antibacterial agents such as nano-silver and chitosan do not need to be additionally added, the obvious antibacterial effect is still achieved, the release rate of the zinc ions can be controlled by regulating and controlling the crosslinking density, and in order to achieve the long-acting and stable antibacterial effect, the application range is wide. The overall biological safety is higher.

The invention discloses high-dispersion carbon black for conductive plastic and a preparation method of the high-dispersion carbon black, the optimal particle distribution state of the high-dispersion carbon black for plastic conduction is as follows in percentage by mass: 19%-21% of 18 meshes, 48%-52% of 35 meshes, 19%-21% of 35 meshes and 6%-14% of 10 meshes. The preparation method has the beneficial effects that the prepared carbon black meets the optimal particle distribution, the carbon black is filled into the plastic, the particle dispersion condition of the plastic and the particle structure related parameters and resistivity after the plastic is filled with the carbon black are detected, it is verified that the carbon black meeting the optimal particle distribution has good dispersity in the plastic, and the conductivity of the plastic is effectively improved. The distribution condition of carbon black particles can be effectively adjusted, high-dispersion carbon black is prepared, and the conductivity of a plastic product can be effectively improved by filling plastic with the high-dispersion carbon black.

The present invention aims at providing a plastic lens having excellent heat resistance and durability in which generation of cracks is suppressed even in high-temperature environments or when a mechanical stress being applied, and has excellent surface hardness and scratch resistance. The present invention provides a plastic lens containing a plastic lens substrate, a layer formed on at least one surface of the plastic lens substrate, and a vapor deposition coated film formed on at least one surface of the hard coating layer, the hard coating layer being a cured product of a curable composition containing a polyorganosilsesquioxane, the polyorganosilsesquioxane containing a constituent unit represented by Formula (1), a constituent unit represented by Formula (I), hard coating a constituent unit represented by (II), and a constituent unit represented by Formula (4); wherein a molar ratio of the constituent unit represented by Formula (I) and the constituent unit (II) represented by Formula (II) is 5 or greater and 500 or less,a ratio of the constituent unit represented by Formula (1) and the constituent unit represented by Formula (4) relative to the total amount (100 mol %) of siloxane constituent units is from 55 to 100 mol %; a number average molecular weight is from 1000 to 50000; and a molecular weight dispersity (a weight average molecular weight / a number average molecular weight) is from 1.0 to 4.0.[Chem. 1][R1SiO3 / 2]  (1)[Chem. 2][RaSiO3 / 2]  (I)[Chem. 3][RbSiO2 / 2(ORc)]  (II)[Chem. 4][R1SiO2 / 2(ORc)]  (4)

The present invention provides a method for preparing a binder-free molecular sieve particulate material, comprising the following steps: step S1, adding chitosan to an acidic aqueous solution, stirring and dissolving, and then ultrasonicating to prepare a chitosan solution; step S2, adding molecular sieves to the chitosan solution, stirring evenly, and obtaining a suspension; step S3, pouring the suspension into an oil phase dispersed with an emulsifier under magnetic stirring to obtain an oil-in-water emulsion; step S4, adding a crosslinking agent to the oil-in-water emulsion, stirring and then standing to obtain a mixed solution of oil and water layers; step S5, recovering the upper oil phase of the mixed solution, and washing and drying the solid particles precipitated in the lower layer of the mixed solution to obtain a crude product; step S6, high-temperature roasting of the crude product to obtain a binder-free molecular sieve particulate material. The above-mentioned preparation method is simple to operate, and can prepare molecular sieve particles with good dispersion, uniform size, and high sphericity. The particles can be directly filled into the back cavity of the speaker, which can significantly improve the low-frequency acoustic performance of the speaker.

The invention provides non-spherical colloidal silicon dioxide as well as a preparation method and application thereof, and belongs to the technical field of polishing solutions. The preparation method comprises the following steps: firstly, uniformly dispersing a seed crystal silicon dioxide solution in ultrapure water, adding organic acid to adjust the pH value of the solution to be acidic to obtain a mixed solution A, heating the mixed solution A to a preset temperature, and curing for a certain time to finally form preliminarily-shaped colloidal silicon dioxide small particles; and then dropwise adding alkyl silicate at a constant speed until the particles grow to a target particle size, and heating and concentrating to remove alcohol to obtain the non-spherical colloidal silicon dioxide. The colloidal silicon dioxide prepared by the method is high in non-sphericity degree and good in stability and dispersity and can be used as grinding particles of a CMP polishing solution, and the method is easy to operate, low in cost and suitable for large-scale production.

The invention relates to the technical field of nano catalytic materials, and discloses a modified Y-type molecular sieve and a preparation method and application thereof, the modified Y-type molecular sieve comprises a Y-type molecular sieve and a ruthenium element loaded on the Y-type molecular sieve; the temperature of a main reduction peak in a reduction curve of the modified Y-type molecular sieve obtained through H2-TPR test is 150-200 DEG C; and after reduction at 500 DEG C in a hydrogen atmosphere for 1 h, TEM characterization shows that the average particle size of the ruthenium metal particles on the modified Y-type molecular sieve is 1.5-3.5 nm. The modified Y-type molecular sieve is good in ruthenium dispersity, high in catalytic activity and good in activity stability.

The application discloses a ternary precursor and a preparation method and application thereof. The preparation method comprises the following steps: 1) nucleation: metal salt solution, ammonia water and lye are introduced into a reactor to perform a nucleation reaction, a protective gas is introduced in the early stage of the nucleation reaction, and a mixed oxygenation gas is introduced in the middle and late stages of the nucleation reaction; 2) growth: after nucleation, the reaction is continuously performed to grow, a protective gas is introduced in the early stage of the growth, a strong mixed oxygenation gas is introduced in the middle stage of the growth, a protective gas is introduced in the late stage of the growth, the feeding is stopped when the growth reaches a preset particle size, the reaction is ended, and the ternary precursor is obtained. The ternary precursor with good sphericity and high tap density and small particles is prepared by controlling the reaction gas atmosphere in the preparation stage, the dispersity of the particles is good, the preparation method is simple, the reaction repeatability is high, and the method is very convenient for industrialization.

The application discloses a kind of temperature-resistant salt-tolerant slow swelling microspheres based on double emulsion and preparation method and application, it is related to oilfield chemical technical field, preparation method includes the following steps: emulsifier is weighed and dissolved in deionized water, ultrasonic dispersion is uniformly, then acrylamide, sulfonic monomer, hydrophobic monomer, polyoxyethylene ether functional monomer, di-vinyl benzene and initiator are added into the dispersion solution of emulsifier respectively, and water phase is prepared by stirring, water phase is slowly added into inner oil phase, and oil-in-water primary emulsion is obtained by high-speed stirring, then oil-in-water primary emulsion is added into outer oil phase and stirred to obtain double emulsion.Double emulsion is deoxidized by nitrogen, and the product is collected after aging at room temperature after stirring polymerization, washed, air-dried to constant weight, and temperature-resistant salt-tolerant slow swelling microspheres are obtained;In the application, the temperature-resistant salt-tolerant slow swelling microspheres prepared based on double emulsion template have spatial isolation effect of annular liquid film, the amphiphilic environment of emulsion provides multiphase reaction space for the synthesis of microspheres, and the microspheres have uniform particle size and excellent dispersity.

The invention belongs to the technical field of nuclear pollution decontamination, and particularly discloses a strippable decontamination material with a uranium developing and tracing function as well as a preparation method and application of the strippable decontamination material with the uranium developing and tracing function. The strippable decontamination material is prepared by taking polyvinyl alcohol (PVA) and the like as film-forming base materials and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) as a developing indicator; and an amphiphilic block copolymer PEA-b-PAA prepared by RAFT polymerization is innovatively adopted as a dispersing agent, so that the technical problems that Br-PADAP is poor in dispersity and easy to agglomerate in a water-based system are effectively solved. The material can be subjected to complexation reaction with uranium pollutants in the decontamination process, color change visible to naked eyes is generated, and visual tracing of a polluted area is achieved; meanwhile, the film-forming property is excellent, complete stripping can be achieved after curing, the decontamination rate on the surfaces of various base materials is all higher than 90%, and the detection limit on uranium can reach 0.81 * 10 <-6 > mol / cm < 2 >. The method is easy and convenient to operate, environmentally friendly and particularly suitable for rapid identification and removal of large-range uranium pollution in nuclear facility decommissioning and accident emergency.

The application discloses a high-stability small-particle-size nucleic acid-gold nanocomposite and a synthesis method thereof, and belongs to the technical field of functional nanomaterial preparation, and the synthesis method comprises the following steps: under the conditions of heating and stirring, a reducing agent solution is added into a boiling chloroauric acid aqueous solution in batches, a solution of a functional nucleic acid molecule with a PolyA sequence at the terminal is added after boiling again, an acetic acid solution is added when the color of the reaction system is changed from light pink or light purple to dark, and the high-stability small-particle-size nucleic acid-gold nanocomposite is prepared after the reaction is completed; the application provides a brand-new "one-pot" synthesis strategy, discards complicated multi-step separation operation, realizes the synthesis of gold nanoparticles and the surface nucleic acid functionalization of the gold nanoparticles in one step in the same reaction system, the preparation process is simple, the product is uniform in particle size, good in dispersity, free from a plasmon resonance absorption peak, and has excellent long-term storage stability without depending on any exogenous polymer protective agent.