407results about How to "Improve dispersion stability" patented technology

The invention relates to the technical field of chemical coatings, and particularly discloses an aerogel flame-retardant heat-insulation coating and a preparation method thereof. The aerogel flame-retardant heat-insulation heat-preservation coating is prepared from the following raw materials in parts by weight: 25 to 40 parts of deionized water, 0.1 to 1.0 part of cellulose, 4 to 10 parts of a building additive, 15 to 30 parts of a silicate flame retardant, 20 to 35 parts of an emulsion, 0.5 to 3.0 parts of aerogel and 12 to 25 parts of hollow glass beads, the preparation method comprises the following steps: adding the cellulose into the deionized water, stirring and mixing, then adding the building additive and the silicate flame retardant, stirring and mixing, then adding the emulsion, stirring and mixing, finally adding the aerogel and the hollow glass beads, and uniformly mixing to obtain the aerogel flame-retardant heat-insulation coating. After the aerogel flame-retardant heat-insulation heat-preservation coating is applied, a protective layer formed by the silicate flame retardant used by the aerogel flame-retardant heat-insulation heat-preservation coating at a high temperature can show relatively good closing performance, so that the aerogel flame-retardant heat-insulation heat-preservation coating has excellent heat-insulation heat-preservation performance and flame-retardant performance.

The invention relates to conductive silver paste and a preparation method thereof, and relates to the technical field of low-temperature curing type conductive paste, the conductive silver paste comprises the following components: multi-dimensional micro-nano conductive silver powder, surface conductive type liquid metal nanoparticles, a multi-system organic resin binding phase, a closed curing agent, a mixed organic solvent and various additives; wherein the mass part of each component is as follows: the mass part of the multi-dimensional micro-nano conductive silver powder is 60-90; the mass part of the surface conductive liquid metal nanoparticles is 5-10; the mass part of the multi-system organic resin binding phase is 0.1-10; the mass part of the closed curing agent is 0.1-5 parts; the mass part of the mixed organic solvent is 5-20; the mass part of each additive is 0.1-10 parts. The bending resistance, the adhesive force and the fatigue resistance of the conductive silver paste are improved.

The invention relates to the technical field of coating preparation, in particular to a highly oil-proof and waterproof fluorine-containing composition and application thereof in coatings, the fluorine-containing composition comprises the following chemical components by weight: 70-80 parts of a resin mixture, 2-5 parts of diisocyanate, 5-8 parts of a modified titanium dioxide filler and 10-15 parts of modified glass flakes, the resin mixture comprises fluorinated hydroxyl acrylic resin and urethane acrylate, and the mass ratio of the fluorinated hydroxyl acrylic resin to the urethane acrylate is (3-5): 1. The resin mixture, the modified titanium dioxide filler and the modified glass flakes form a stable composite structure through chemical bonding and physical effects, and finally the fluorine-containing composition shows excellent waterproof and oil-proof performance and good mechanical strength.

The invention discloses a doped iron manganese phosphate precursor, a preparation method and a lithium iron manganese phosphate positive electrode material, and belongs to the technical field of lithium ion batteries. The doped iron manganese phosphate precursor and the lithium iron manganese phosphate positive electrode material are prepared by adopting a hydrothermal method, and the grain size is refined by doping vanadium ions; the diffusion rate and the conductivity of lithium ions are improved, and the rate capability and the electronic conductivity of the positive electrode material are enhanced. And in the preparation process, quaternization modified sodium lignin sulfonate is used as a dispersing agent, so that the dispersity among particles is improved, and the problem that the electrochemical performance of the positive electrode material is reduced due to the fact that the particle size is too small and the particles are agglomerated due to vanadium doping is solved. The molecular chain of the quaternization modified sodium lignin sulfonate also contains dithio-carboxyl, so that manganese ions can be reduced and fixed while the dispersing performance of the dispersing agent is improved, the structural stability is improved, and the dissolution of manganese is reduced.

The invention provides a method for improving lubricating property and wear resistance of base oil and a method for improving dispersion stability of graphite in the base oil. A telechelic polymer is adopted, the telechelic polymer is composed of an oil-soluble central chain and two non-oil-soluble pyrene functionalized end-group chains, and the telechelic polymer can be self-assembled into a completely cross-linked, rodlike and stable gel network through pi-pi stacking interaction. The telechelic polymer is added into the base oil, so that stable oil gel can be formed, on one hand, leakage and wriggling of the base oil can be remarkably relieved, and on the other hand, the lubricating property and wear resistance of the base oil can be improved; when graphite or a derivative thereof is also added, the lubricating property and the wear resistance can be further improved, particularly when the graphite is added, the graphite can be stripped into graphene in situ under the assistance of ultrasonic waves, the cost is low, the method is simple and easy to implement, and the dispersion stability of the graphite is improved.

The invention relates to a modified binder as well as a preparation method and application thereof. The modified binder comprises an inner core layer, a middle shell layer and an outer shell layer which are sequentially arranged from inside to outside, wherein the inner core layer and the middle shell layer are made of butadiene styrene rubber, and the strength of the inner core layer is greater than that of the middle shell layer; and the shell layer is formed by unsaturated acid and unsaturated ether substances. According to the scheme provided by the invention, the problems of negative electrode coating cracking and material floating in the coating process can be effectively improved, the stripping force of the negative electrode piece is improved, and the adhesive property is good; and the dispersion of the negative active material, the conductive agent and the like can be improved and promoted, the loading capacity of the negative active material is improved, and the energy density and cycle performance of the battery are improved.

The invention provides a label-free magnetic self-assembly nanoprobe, a construction method thereof and application of the label-free magnetic self-assembly nanoprobe in detection of PrPC protein. The label-free magnetic self-assembly nanoprobe disclosed by the invention comprises a magnetic Fe3O4 / Fe2O3 (at) Au heteroplasmon nanorod array and a sulfhydrylation aptamer nucleic acid chain which is combined with the magnetic Fe3O4 / Fe2O3 (at) Au heteroplasmon nanorod array through an Au-S bond; a biosensor prepared from the label-free magnetic self-assembly nanoprobe is good in reproducibility and stability; the RSD value of multiple times of detection (intraday / day) is 1.55%; the storage time of multiple groups of sensors is 0-15 days, and the change of response signal values does not exceed 4%; the biosensor has a relatively low detection limit (1pg / mL), a relatively wide linear range (1 * 10 < pg / mL >-1 * 10 < 5 > pg / mL) and relatively good sensitivity, has very good application in detection of PrPC, and has very good practicability.

The invention provides positive conductive paste, a positive plate and a lithium ion battery. The positive electrode conductive paste comprises a solid and a solvent, and the positive electrode conductive paste comprises the following components in percentage by mass of the solid: 0.02%-0.05% of a single-walled carbon nanotube, 0.3%-0.7% of a carbon black conductive agent, 0.1%-0.5% of a softening agent, 0.1%-0.5% of a dispersing and anti-cracking integrated auxiliary agent, 96%-98% of a positive electrode active material and 1%-2.25% of a binder. By adding the single-walled carbon nanotubes, the conductivity and mechanical properties of the positive electrode conductive paste are improved. And the softening agent improves the rheological property of the positive electrode conductive paste and enhances the flexibility of the pole piece at the same time. And the dispersing and anti-cracking integrated auxiliary agent effectively disperses positive electrode active material particles and prevents coating and baking cracking. The high solid content achieved under the cooperative work of the three is beneficial to solving the problems of brittle failure, low coating rate, easy cracking of the pole piece and the like of the thick pole piece.

The invention relates to the technical field of surfactants for oil field oil extraction, in particular to a surfactant for oil field oil extraction and a preparation method thereof.The surfactant is prepared from, by weight, 15-20 parts of polymer surfactants, 8-12 parts of enhancing auxiliaries, 6-8 parts of temperature-sensitive microspheres and 80-90 parts of water, the problems that an existing surfactant for oil extraction in an oil field is insufficient in activity and poor in effect are solved by compounding a high-molecular surfactant, a reinforcing auxiliary agent containing a hyperbranched structure and temperature-sensitive microspheres loaded with microorganisms, and meanwhile, the surfactant has a certain temperature-sensitive characteristic and can play a role in the deep position of an oil layer to form a plugging and flooding composite effect; therefore, the crude oil recovery rate of surfactant flooding can be well improved.

The invention relates to the technical field of self-cleaning coatings, in particular to a two-component inorganic super-hydrophilic self-cleaning coating and a preparation method and application thereof.The preparation method comprises the following steps that 1, gamma-aminopropyltriethoxysilane is dissolved in an ethanol water solution, then titanium dioxide sol is added, stirring reaction is conducted for 2-4 h at the temperature of 40-50 DEG C, and modified titanium dioxide sol is obtained; (2) dispersing nano-montmorillonite in ethanol, then adding tea polyphenol, and performing ultrasonic dispersion for 0.5-1 hour to obtain a modified nano-montmorillonite suspension; (3) mixing a cerium nitrate solution with the alumina sol, then adding the modified montmorillonite suspension, and uniformly mixing to obtain composite alumina sol; and (4) mixing and cross-linking the prepared modified titanium dioxide sol and composite aluminum oxide sol to obtain the self-cleaning coating. The long-acting super-hydrophilic self-cleaning coating provided by the invention has the advantages of excellent self-cleaning capability, stable and long-acting super-hydrophilicity, wear resistance and antistatic effect.

The invention belongs to the technical field of papermaking dyes, and particularly relates to an environment-friendly dye for papermaking and a preparation method thereof. According to the invention, the sulfonate surfactant is prepared by a two-step method, and the sulfonate surfactant has excellent dispersibility, stability and emulsibility, and has good compatibility with alkaline auramine O; the sulfonate surfactant is compounded with the alkaline bright yellow O for use, so that the solubility, dispersion stability and high-temperature stability of the alkaline bright yellow O dye can be remarkably improved in manners of reducing interfacial tension, increasing wettability, improving permeation and the like. When the prepared environment-friendly dye is used for dyeing paper, the dye-uptake and the color fastness to light of the dye can be obviously improved, the dyeing uniformity and effect are improved, the dye waste is effectively reduced, and the requirement of green development is met.

The invention provides a tracer agent for an oil field and a method for evaluating oil production contribution of each section of a horizontal well, and belongs to the technical field of oil field development. The tracer agent for the oil field, provided by the invention, is prepared from white oil, a nonionic surfactant, 3-allyloxy-2-hydroxy propanesulfonic acid sodium salt and alcohols; wherein the rare earth metal salt, the complexing agent and the sodium 3-allyloxy-2-hydroxy propanesulfonate form a complex; the complexing agent is a mixture of glycolic acid, triethylene tetramine and sodium dimercaptopropanesulfonate in a mass ratio of 10: (3-5): (1-2). The tracer agent for the oil field can stably exist under complex stratum conditions and can resist hypersalinity; in the process of evaluating the oil production contribution of each section of the horizontal well by using the tracer agent for the oil field, different types and different dosages of tracer agents are selected for different layer sections, so that the evaluation of the oil production contribution of each section of the horizontal well can be realized, and an effective basis is provided for subsequent refracturing.

The present invention relates to an anti-caking tablet for metallocene olefin polymerization process, wherein the anti-caking tablet comprises the following raw material components in parts by weight: 50-99.9 parts of alkane oil solvent, 0.01-20 parts of fatty acid compounds, 0.01-40 parts of fatty acid salt compounds, and 0.001-5 parts of emulsifiers. Compared with the prior art, the present invention can effectively prevent, reduce or stop the agglomeration and flake problem of polyolefin particles during the polymerization process, improve the dispersion stability of the anti-caking tablet, and have no obvious adverse effect on the activity of the matching metallocene catalyst. At the same time, the obtained final product can be used for various applications such as food contact.

The invention discloses an antiviral water-based paint for an interior wall and a preparation method thereof, and belongs to the technical field of water-based paints. The antiviral water paint is used for solving the technical problem that in the prior art, the antiviral performance, the antibacterial performance and the moisture resistance of an antiviral coating need to be further improved. Comprising the following components in parts by weight: 90 to 105 parts of antibacterial and antiviral emulsion, 1.0 to 1.3 parts of dispersing agent, 0.5 to 0.8 part of wetting agent, 0.6 to 1.0 part of defoaming agent, 1.2 to 1.5 parts of thickening agent and 20 to 25 parts of activated filler. The antibacterial agent, modified zinc oxide and the acrylic monomer are prepared into the antibacterial and antiviral emulsion in a free radical polymerization mode in the polysiloxane silicon emulsion containing the multi-element olefin, and the antibacterial and antiviral emulsion is matched with the activated filler, so that the storage stability of the water-based paint is effectively improved, and the service life of the water-based paint is prolonged. And the moisture resistance, scrubbing resistance, long-acting antibacterial property and antiviral property of a water-based paint film are also improved.

The invention discloses epigallocatechin gallate starch nanoparticles as well as a preparation method and application thereof, and belongs to the technical field of medicinal chemistry. According to the method, high-proportion branched-chain cassava starch is used as a raw material, ultrasonic microwave assistance is adopted, in the nanometer starch alcohol precipitation process, epigallocatechin gallate is synchronously packaged to form nanometer-level epigallocatechin gallate starch nanometer particles, and embedding of epigallocatechin gallate is completed. The embedding rate of the epigallocatechin gallate starch nanoparticles can reach 50.20%, the drug loading capacity can reach 311mg / g, the drug slow release performance is obvious in the process of simulating gastrointestinal digestion, the sustained release time can be 20 hours, the drug release capacity can reach 72.33% and 90.10% respectively, and the preparation process is simple, easy to operate, low in preparation cost and suitable for large-scale production and application.

The invention provides alpha-aluminum oxide powder and a preparation method, and belongs to the field of inorganic nonmetals. The method comprises the following steps: mixing an aluminum oxide precursor, a steric hindrance agent and a solvent to obtain mixed slurry; sanding the mixed slurry to obtain superfine slurry; carrying out spray drying on the superfine slurry to obtain superfine powder; mixing the ultrafine powder and a grain inducer to obtain a roasting precursor; and roasting the roasting precursor under set roasting conditions to obtain the alpha-aluminum oxide powder. Firstly, a steric hindrance agent is added into an aluminum oxide precursor, so that steric hindrance is formed in emulsification and dispersion processes, and agglomeration of powder is inhibited; secondly, through sanding, dispersity and uniformity of raw material particles are guaranteed; thirdly, a seed crystal inducer is added into the superfine powder, so that superfine particles can be formed through induction, and the conversion temperature can be reduced. Therefore, the alpha conversion rate of the alpha-aluminum oxide is improved, and the dispersion stability of the alpha-aluminum oxide is improved.

The invention discloses a colored fluorescent particle for electrophoretic display, and relates to the field of photoelectric display, the colored fluorescent particle is of a core-shell structure, and the colored fluorescent particle sequentially comprises a core, a middle layer and a shell layer from inside to outside; the core is a pigment unit, the middle layer is a quantum dot layer coating the surfaces of pigment particles, the shell layer comprises one or more high-molecular polymers selected from polylauryl methacrylate and polymethyl methacrylate, and the surface of the middle layer is coated with the shell layer; the color fluorescent particles comprise intrinsic primary colors presented by the pigment units and compensation fluorescence excited by the quantum dot layer under light; and the compensation fluorescence is matched with the intrinsic primary color. In addition, the invention also provides a preparation process of the colored fluorescent particles. The colored fluorescent electrophoretic particle provided by the invention is pure and full in color and luster, and is more gorgeous in color under the excitation of ultraviolet rays.

The invention discloses a method for preparing a graphene dispersion liquid by using a gemini surfactant in combination with a sanding process, and belongs to the technical field of graphene. Adding graphene into the gemini surfactant solution, carrying out pre-dispersion, and sanding the obtained graphene aqueous solution to obtain the graphene dispersion liquid. The method provided by the invention can realize efficient dispersion of graphene, is good in stability, safe and environment-friendly, remarkably simplifies the subsequent processing technology of the material, and has important practical significance and industrial potential.

The present invention provides an oil-dispersible polydopamine nano-lubricating additive and a preparation method and application thereof, belonging to the field of new material technology. The additive is prepared by the following method: taking polydopamine nanoparticles, dispersing them in water, adjusting the pH of the dispersion to 3-4 with dilute hydrochloric acid, and continuously stirring the reaction; adding ethyl acetate to the dispersion after the reaction, then dripping a lipophilic fluorine-containing anion salt solution, and stirring for 0.5-1h; obtaining the oil phase after the reaction, and removing the ethyl acetate. The present invention adopts a simple and controllable protonation reaction and anion transfer process to successfully adjust the lipophilicity and lipophobicity of polydopamine nanoparticles, and achieves its long-term dispersion stability in polyethylene glycol base oil for more than 30 days. The polydopamine nanoparticles prepared by the present invention can be directly dispersed in polyethylene glycol lubricating base oil, and have an effective lubricating effect on the friction and wear between metal / metal friction pairs.

The invention belongs to the technical field of polymer composite materials, and discloses a method for preparing an aqueous polyvinyl chloride emulsion and a functional film and applications thereof, wherein the preparation steps are as follows: firstly, a hydrophilic modifier and polyvinyl chloride are reacted to obtain hydrophilic modified polyvinyl chloride; then a quaternary ammonium salt is used to modify a lignin derivative to obtain a lignin quaternary ammonium salt; finally, the lignin quaternary ammonium salt and the hydrophilic modified polyvinyl chloride are uniformly dispersed in a mesh gel structure of sodium carboxymethyl cellulose to obtain an aqueous polyvinyl chloride emulsion, and further film-formed to obtain a polyvinyl chloride functional film. The polyvinyl chloride functional film provided by the invention has good hydrophilic properties, anti-ultraviolet and antibacterial properties, and the preparation process is convenient to operate, conforms to the concept of green environmental protection, and can be applied to the fields of film materials such as gloves and functionalized packaging.

The invention discloses a low-viscosity high-stability perfluoropolyether-based magnetic liquid and a preparation method thereof, and relates to the technical field of magnetic material preparation, and the preparation method comprises the following steps: preparing composite nano magnetic particles of ferroferric oxide and carbon nanotubes by adopting a chemical in-situ coprecipitation method; coating the composite nano magnetic particles with a perfluoropolyether surfactant; the composite nano magnetic particles are dispersed into the perfluoropolyether oil-based carrier liquid, and the solid content of the composite nano magnetic particles accounts for 5 wt%-20 wt%. Ferroferric oxide and carbon nano tube composite nano magnetic particles are obtained through a chemical precipitation method, the particles are stably dispersed in perfluoropolyether-based carrier liquid under the modification effect of a surfactant, and under the condition of low solid content, the dispersion stability and magnetic field stability of the magnetic liquid are greatly improved; the problem of overheating caused by the fact that high-viscosity magnetic liquid is used for high-rotating-speed sealing is greatly solved.

The invention discloses a synthesis method of oil-soluble trinickel disulfide nanoparticles. The synthesis method comprises the following steps: adding nickel stearate and sulfur powder into a reaction container; a solvent and a surface modifier are added into the reaction container to obtain an initial mixed solution, the solvent is octadecene, and the surface modifier is oleylamine; performing ultrasonic treatment on the initial mixed solution to uniformly mix the initial mixed solution to obtain a mixed solution; introducing inert gas into the reaction container to exhaust air in the reaction container so as to ensure that the reaction is carried out in an inert atmosphere; and carrying out a hot stirring reaction on the mixed solution, and after the reaction is finished, carrying out solid-liquid separation and washing to obtain the oil-soluble trinickel disulfide nanoparticles. Particularly, an intelligent technology is also adopted to help to quickly determine proper synthesis parameters according to actual synthesis conditions and requirements, so that the intelligent degree of the synthesis process of the oil-soluble trinickel disulfide nanoparticles is improved.

The invention belongs to the technical field of semiconductors, and particularly relates to a polishing composition and a preparation method and application thereof. The polishing composition comprises grinding particles, an oxidizing agent, an organic dispersing agent, an inorganic dispersing agent, a pH buffering agent, a pH adjusting agent and water. Wherein the oxidizing agent comprises permanganate, the organic dispersing agent forms an organic coating layer on the surface of the grinding particles, and the inorganic dispersing agent forms an inorganic coating layer on the surface of the organic coating layer. Through the steric hindrance of the organic dispersing agent and the static stable synergistic effect of the inorganic dispersing agent, the grinding particles obtain a good dispersing effect. Meanwhile, the outer surface of the organic coating layer is coated with the inorganic coating layer, so that oxidative damage of a strong oxidant to organic dispersant molecules of the organic coating layer can be prevented, and the dispersion stability and the polishing stability of the polishing composition are improved. Therefore, the polishing composition containing the grinding particles can continuously obtain low-defect and low-roughness surfaces when processing third-generation semiconductor materials.

The invention discloses an innovative process for preparing a liquid fertilizer from an acetylisovaleryltylosin tartrate waste liquid for vegetable planting, and relates to the technical field of fertilizer preparation, and the innovative process comprises the following specific steps: step 1, preliminary pretreatment of the acetylisovaleryltylosin tartrate waste liquid; the preparation method has the advantages that the aminopropyltriethoxysilane enhances the dispersion stability of titanium dioxide in a waste liquid environment, the reduction of the effective surface area capable of participating in the reaction due to agglomeration is avoided, and the comprehensive and efficient promotion of the photocatalytic reaction is guaranteed; amino functional groups carried by aminopropyltriethoxysilane can be specifically combined with various organic substances in the waste liquid to guide a photocatalytic reaction to directionally act on specific organic macromolecules, so that the decomposition process is more targeted and efficient, the conversion efficiency of nutritional ingredients is greatly improved through the synergistic effect, and the photocatalytic effect of the waste liquid is improved. Macromolecular protein, polysaccharide and the like in the waste liquid are efficiently converted into micromolecular nutrients such as amino acid, monosaccharide and the like, and the content of effective nutritional ingredients in the liquid fertilizer is remarkably increased.

The invention provides a thermal response type nano polymer gel blocking agent and a preparation method thereof. The method comprises the following steps: mixing 20-40 parts of vinyl silicon dioxide microspheres, 30-80 parts of a temperature-sensitive monomer, 15-30 parts of dimethylaminoethyl methacrylate, 6-10 parts of 3-acrylamidophenylboronic acid, 1-5 parts of a cross-linking agent and 100-150 parts of water to obtain a mixed solution; and adding 0.1-0.3 part of an initiator, stirring and reacting under the protection of inert gas, cooling, filtering, washing and drying to obtain the thermal response type nano polymer gel blocking agent. The plugging agent can tolerate the high temperature of 180 DEG C or above for a long time, the pressure-bearing plugging capacity reaches 16 MPa or above, the plugging efficiency and the permeability recovery value of a low-permeability shale core reach 100%, shale micropores and micro cracks can be efficiently plugged, a plugging layer with the permeability being zero is formed near a well wall, and the purposes of stabilizing the well wall and protecting an oil and gas layer are achieved.

The invention relates to a preparation technology of a polyurethane nanoscale microporous membrane for protective clothing, and belongs to the technical field of clothing fabric preparation, and the preparation technology specifically comprises the following steps: extracting silk fibroin and carrying out hydrophobic modification to obtain modified silk fibroin; then, the modified cellulose and polyurethane are mixed and dissolved in a solvent, a pore-forming agent and breathable particles obtained by mixing the modified cellulose and aerogel powder are added, and a mother solution is prepared; and finally, preparing a membrane by using the mother liquor, thereby obtaining the polyurethane nano-scale microporous membrane for the protective clothing. According to the process, modified silk fibroin and a polyurethane material are mixed, and breathable particles obtained by mixing modified cellulose and aerogel powder are added, so that the mechanical property of the membrane is remarkably improved, and the breathability is optimized. Meanwhile, through acetylation treatment on silk fibroin and modification on carboxymethyl cellulose by using dopamine hydrochloride, the overall performance of the material and the stability in the preparation process are further improved.

The invention discloses a low-density flame-retardant organic silicon foam composition, a silicon rubber foam material and a preparation method of the low-density flame-retardant organic silicon foam composition and the silicon rubber foam material, and the foam composition comprises the following components in parts by weight: (A) 100 parts of organopolysiloxane; (B) 5-100 parts of a reinforcing filler; (C) 20-100 parts of a composite flame-retardant filler; (D) 1-10 parts of a structuring control agent; (E) 1-10 parts of a foaming agent; (F) 1-10 parts of an auxiliary foaming agent; (G) 1-10 parts of hydrogen-containing siloxane; (H) 0.01-3 parts of a platinum group metal compound catalyst; (I) 0.01-1 part of an inhibitor; according to the organic silicon foam composition, the component (F) and the component (E) are introduced, so that the foaming speed and the curing speed can be better matched, the organic silicon foam composition has a relatively high foaming ratio after being cured, the density of a material can be remarkably reduced, and meanwhile, foam pores of foam are uniform and fine in size.

The invention discloses a preparation method of lithium ion battery negative electrode slurry, which is characterized by comprising the following steps: step 1, sequentially adding 0.5-1 part by weight of CMC dry powder, 0.5-1.2 parts by weight of a conductive agent and 95-97.5 parts by weight of an active substance into a stirring kettle, enabling the stirring kettle to rotate at 400-600 rpm and revolve at 20-30 rpm, and stirring for 20-30 minutes, so that each component is fully and uniformly dispersed to form required mixed powder; step 2, deionized water is added into the mixed powder obtained in the step 1 for kneading, the rotation speed of a stirring kettle is 0 rpm, the revolution speed of the stirring kettle is 20-30 rpm, and the kneading time is 30-60 min; 3, adding 1-2.5 parts by weight of PAA, dispersing at a high speed, and uniformly stirring; the rotation speed of the stirring kettle is 1500-2000 rpm, and the revolution speed is 25-30 rpm. According to the preparation method of the lithium ion battery negative electrode slurry disclosed by the invention, the viscosity characteristic of the slurry is reasonably regulated and controlled, so that the slurry is ensured to have excellent coating performance, and precipitation in the standing process can be avoided, thereby remarkably improving the uniformity and density of a battery negative electrode layer.

The invention discloses a fireproof flame-retardant cable and a preparation method thereof, and relates to the technical field of cables. A modified expanded perlite composite material is combined with 4, 5-dihydroxy-2-hexenoic acid and boric acid, boron doping is achieved, a nitrogen-boron synergistic flame-retardant system is formed, then pre-crosslinking with butadiene rubber and double-bond-containing allyl modified phenolic resin is carried out through double bonds, the mechanical property of the cable is optimized, in addition, due to construction of the pre-crosslinking system, the flame-retardant performance of the cable is improved, and the service life of the cable is prolonged. The boron-doped composite material, the allyl modified phenolic resin and other substances with the flame-retardant effect are inserted into the three-dimensional network cross-linked structure in a penetrating manner, so that the flame-retardant stability and dispersion stability of the material are improved, the compactness of the flame-retardant fireproof outer sleeve layer is further improved, the flame-retardant fireproof outer sleeve layer has good mechanical properties and fire retardance and is not prone to cracking, and meanwhile, the flame-retardant fireproof outer sleeve layer has the good flame-retardant effect. The modified expanded perlite composite material forms a heat insulation network by means of a pre-crosslinking structure, so that the prepared sheath mixture has excellent heat insulation and heat resistance, and the fireproof performance of the cable is improved.

The present invention discloses a method for upconversion nanoparticle phase transition and DNA coupling using amphiphilic DNA, comprising the following steps: S1, synthesizing an amphiphilic DNA molecule modified with multiple alkane side chains; S2, dissolving the amphiphilic DNA molecule with DMSO, adding chloroform and ultrasonication; S3, providing an upconversion nanoparticle, and resuspending it with chloroform; S4, uniformly mixing the upconversion nanoparticle with the amphiphilic DNA molecule, ultrasonically dispersing it, and resuspending it with an aqueous buffer solution, combining the alkane side chain of the DNA molecule with the hydrophobic ligand on the surface of the upconversion nanoparticle through the effect of ligand intercalation, obtaining a DNA molecule-modified upconversion nanoparticle, and realizing phase transition and DNA coupling of the upconversion nanoparticle at the same time. According to the present invention, the upconversion nanoparticle can be well converted from the organic phase to the aqueous phase, realizing uniform dispersion of the upconversion nanoparticle in the aqueous phase, and having good biomedical application prospects.