16results about How to "Prevent gelation" patented technology

The application discloses a method for regenerating cellulose from waste cotton based on ion solvation pretreatment and application thereof, and belongs to the technical field of high-value utilization of biomass resources. The method is characterized in that waste cotton fabric is immersed in a metal halide aqueous solution for ion solvation pretreatment, and then subjected to mild decolorization by a reduced decoloring agent, and then high-polymerization-degree cotton cellulose after decolorization is dissolved in a cellulose solvent system to obtain a high-transparency and high-activity cellulose solution. The cellulose solution can be widely applied to the fields of regenerated cellulose fiber spinning, nanocellulose preparation, functional aerogel / hydrogel construction and high-performance gel electrolyte. The application overcomes the problem that the thoroughness of decolorization and the retention of polymerization degree of regenerated waste cotton textiles are difficult to be considered simultaneously, and realizes efficient decolorization, high-polymerization-degree retention and efficient dissolution of waste colored cotton textiles in various solvent systems.

This invention relates to the field of carbon nanotube technology, specifically disclosing a high-viscosity carbon nanotube conductive paste and its preparation method. The raw materials for this high-viscosity carbon nanotube conductive paste include ultra-long single-walled carbon nanotubes, short-cut multi-walled carbon nanotubes, conductive carbon black, carboxyl-terminated hyperbranched polyester-polyethylene glycol block copolymer, polyacrylic acid, fluorinated silane coupling agent, γ-butyrolactone, and N-methylpyrrolidone. The high-viscosity carbon nanotube conductive paste provided by this invention achieves uniform dispersion, low volume resistivity, excellent anti-settling properties, and good coating processability of the carbon nanotube conductive paste under high solids content through the synergistic effect of the carboxyl-terminated hyperbranched polyester-polyethylene glycol block copolymer, the fluorinated silane coupling agent, and polyacrylic acid, combined with multi-stage grinding and high-pressure homogenization processes.

The application relates to the technical field of chemical production equipment, in particular to a high-stability water-based acrylic pressure-sensitive adhesive preparation device and process, which comprises a supporting assembly, a stirring assembly and a heat exchange assembly, the supporting assembly provides a structural basis, the stirring assembly drives a scraper to remove adhesions on the inner wall and mix materials through a linkage mechanism, and the heat exchange assembly realizes double efficient temperature control inside and outside by using a circulating pump, a spiral pipe and a liquid distribution channel. The application can effectively solve the problem of poor colloid stability caused by uneven mixing, inner wall adhesion and poor heat dissipation, and improve the product quality consistency.

The invention relates to light dehydrofluorination modified PVDF (polyvinylidene fluoride) resin as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving PVDF resin to be modified in a polar solvent to obtain a PVDF solution; the method comprises the following steps: adding weak organic alkali into a PVDF solution in a protective gas atmosphere, and then carrying out dehydrofluorination modification; and after the reaction is finished, terminating the reaction by using an acidic alcohol solution, and carrying out precipitation, washing and drying to obtain the light dehydrofluorination modified PVDF resin. Compared with the prior art, the high-temperature-resistant PVDF resin with high thermal stability and good melt processability can be obtained, and the high-temperature-resistant PVDF resin can be used for 200-DEG C-grade injection molding or extrusion molding products.

The present invention relates to a method for manufacturing a positive electrode active material, a positive electrode active material manufactured by the method, a positive electrode containing the positive electrode active material, and a lithium secondary battery. The method comprises: mixing a lithium transition metal oxide and a hollow carbon material to form a mixture; and mechanically treating the mixture to form a carbon coating on the surface of the lithium transition metal oxide, wherein the hollow carbon material is in a chain shape and has a carbon content of 500 m / s. 2 / g or more, a specific surface area of ​​1.0 or more, a degree of graphitization (I D / I G ) and DBP oil absorption above 300mL / 100g.

A binder according to an embodiment of the present invention contains: a vinylidene fluoride polymer containing 50 mol% or greater of vinylidene fluoride units; and an oxime.

The present invention relates to a silk fibroin / hydroxyapatite composite material, and a preparation method therefor and an application thereof. A uniform mixture of hydroxyapatite nanoparticles, silk fibroin, and hexafluoroisopropanol is maintained at a temperature range from 50°C to 60°C for at least 1 hour to obtain a silk fibroin / hydroxyapatite solution; the silk fibroin / hydroxyapatite solution is poured into a long cylindrical mold, two ends of the long cylindrical mold being respectively an end A and an end B; at room temperature, the end A is opened and the end B is closed, and the mold is vertically immersed in methanol with the opening facing up and let stand for at least 2 days; the mold is turned upside down, the end A is closed and the end B is opened, and the mold is vertically immersed in the methanol with the opening facing up and let stand for at least 2 days; the mold is removed, and ventilation and drying are performed to obtain a silk fibroin / hydroxyapatite composite material. The silk fibroin / hydroxyapatite composite material prepared in the present invention has uniform strength, good mechanical properties, and significant osteoinductivity.

The invention discloses a preparation method of high-solid-content and high-flowability sodium ion aqueous positive electrode slurry, which comprises the following steps: S1, preparation of a glue solution: adding a binder into deionized water, and stirring to obtain the glue solution; s2, preparation of a high-fluidity glue solution: adding a first glue solution flow regulator into the glue solution, and stirring at a high speed to obtain the high-fluidity glue solution; s3, preparing a weakly alkaline glue solution, namely adding a second pH flow regulator into the high-flowability glue solution, and stirring to obtain the weakly alkaline glue solution; s4, preparation of a conductive adhesive solution: adding a first conductive agent into the alkalescent adhesive solution, and stirring to obtain the conductive adhesive solution; s5, preparation of first slurry: adding the active substance material into the conductive adhesive solution in batches, stirring and dispersing, and adjusting the viscosity to obtain the first slurry; and S6, preparation of finished slurry: adding the second conductive agent into the first slurry, and stirring and dispersing at a medium-low speed to obtain the final slurry. The invention has the characteristics of good fluidity, high solid content and green and environment-friendly process.

The invention discloses a preparation method and application of an organic silicon modified aluminum-zirconium / titanium bimetallic composite fluorine removal agent (CSAZ / CSAT), and belongs to the technical field of water treatment. Zirconium tetrachloride or diluted titanium tetrachloride is compounded with aluminum chloride to construct a bimetallic framework. Meanwhile, vinyltriethoxysilane (VTES) is introduced as an organic modifier, and heterogeneous copolymerization is carried out on an organic silicon hydrolysate and metal hydroxyl by controlling the dripping rate and the reaction temperature. According to the fluorine removal agent, by utilizing the bridging effect of organic silicon and the synergistic effect of double metals, the adsorption, complexation and net capture capacities on fluorine ions are remarkably enhanced. Experiments show that when the molar ratio of Al to Zr is 9: 1 (CSAZ) or the molar ratio of Al to Ti is 14: 1 (CSAT), the defluorination effect is optimal. When the agent is applied, the pH value does not need to be adjusted, a coagulant aid does not need to be added, efficient removal of fluorine ions can be achieved only through a single agent, the agent has the advantages of being low in dosage, neutral in effluent pH value and the like, and the industrial problems that a traditional fluorine removal process is long in process, large in acid and alkali consumption and difficult in sludge treatment are effectively solved.

The invention discloses purified graphene oxide and a method, and belongs to the technical field of industrial graphene oxide. According to the purification method disclosed by the invention, the oxalic acid solution is adopted as a solvent, the oxalic acid solution is easy to obtain in the market, low in price and beneficial to large-scale use, oxalic acid only contains carbon, hydrogen and oxygen elements which are the same as the elements of graphene oxide, new impurities are not introduced, introduction of impurity ions such as Cl <-> and Na < + > is avoided, and the method is suitable for industrial production. The contents of K < + >, Mn < 2 + > and S < 2-> in impurity ions in the purified graphene oxide are greatly reduced, and the technical problems that the cost of materials adopted by an existing purification method is high and large-scale production is difficult to realize are solved.

The present invention discloses a positive electrode lithium replenisher material and a preparation method and application thereof. The preparation method comprises: mixing and reacting Li2NiO2 in a specific atmosphere under a specific environment to obtain a Li2NiO2 positive electrode lithium replenisher material with a core-shell structure, wherein the core is Li2NiO2 and the shell is the reaction product Li3N. In the present invention, the positive electrode lithium replenisher can generate Li3N on the surface in a specific environment. Li3N isolates the reaction between moisture and the inner layer lithium replenisher, solves the problem that the positive electrode lithium replenisher material is sensitive to moisture, improves the environmental stability of the material, and avoids the occurrence of gelation. At the same time, lithium nitride has a high theoretical specific capacity, and a small amount of addition can achieve an improvement in the coulomb efficiency of the battery in the first week. At the same time, the safety performance and coulomb efficiency of the battery can be improved.

The invention discloses a high-viscosity nylon composition. The high-viscosity nylon composition comprises at least one polyamide; the polyamide is a polyfunctional compound comprising at least three acid or amine functional groups capable of forming an amide bond with functional groups of a dicarboxylic acid monomer and a diamine monomer by polymerizing the dicarboxylic acid monomer and the diamine monomer, and optionally polymerizing a bifunctional and / or monofunctional compound comprising an acid or amine functional group capable of forming an amide functional group with the functional groups of the dicarboxylic acid monomer and the diamine monomer. The present invention has developed polyamides modified with polyfunctional and optionally bifunctional and / or monofunctional compounds, the modified polyamides having high viscosity and excellent mechanical properties, while avoiding gelation using conventional polymerization processes.

A positive electrode slurry composition includes a positive electrode active material, a binder, a dispersant, and a solvent, wherein the positive electrode active material includes lithium iron phosphate having a carbon coating layer on the surface thereof, and the binder includes polyvinylidene fluoride satisfying the following Expression 1 0≤2A+B / C+D×100<0.2 wherein A, B, C, and D are the integrated areas of respective peaks exhibited at 11.5 ppm to 12.8 ppm, 3.9 ppm to 4.2 ppm, 2.6 ppm to 3.2 ppm, and 2.1 ppm to 2.35 ppm as measured by 1H-NMR of the polyvinylidene fluoride.

To provide a solid electrolyte, an electrolyte composition, an electrolyte sheet, and a power storage device, in which gelling is suppressed. The solid electrolyte (18) has a garnet-type structure which contains Li, La, Zr, and O, in which, with respect to particles (21) of the electrolyte having a particle size equal to or greater than the particle size at which the cumulative value of frequency in a volume-based particle size distribution reaches 10%, a number average of degrees of envelope of particles is 0.8 or greater, the degree of envelope being defined as a ratio (area within a contour (22) of a particle / area within an envelope (23) of the particle). The electrolyte composition includes a solid electrolyte, an ionic liquid containing an imidazolium cation, a lithium salt, and a polymer having -CH2CF2-. The electrolyte sheet is formed of the electrolyte composition. The power storage device has an electrolyte layer formed of the electrolyte composition.

The invention relates to an in-situ repair silicon-based composite material which is prepared by the following steps: performing in-situ modification on a pre-lithiated silicon-based material containing a carbon coating layer by using a repair agent, and carbonizing at 450-600 DEG C to form an organic silicon-carbon repair patch, the repairing agent is formed by compounding epoxy silane, bis (amino) silane, bis (silane) polyethylene glycol and 1, 3, 5-benzoyl chloride according to the mass ratio of 1: (0.5 to 0.8): (0.1 to 0.2): (0.01 to 0.03), and the repairing agent is a mixture of the epoxy silane, the bis (amino) silane, the bis (silane) polyethylene glycol and the 1, 3, 5-benzoyl chloride. The mass ratio of the pre-lithiated silicon-based material containing the carbon coating layer to the repairing agent is 100: (7-20). According to the organic silicon-carbon repair patch, dissolution of lithium silicate of a lithiated silicon-based material is inhibited, and gelation and gas production phenomena of negative electrode slurry are avoided; the size of silicon grains is not obviously increased in the in-situ repairing process; when the finally prepared silicon-based composite material is used as a negative electrode of a lithium battery, high initial coulombic efficiency and stable cycle performance are achieved.

The application belongs to the technical field of haematococcus pluvialis separation, and specifically discloses a ternary cross-linked nanofiltration membrane, a preparation method and application. The nanofiltration membrane comprises a polyethersulfone ultrafiltration membrane base film, a polydopamine intermediate layer and a ternary cross-linked functional layer sequentially loaded on the surface of the polyethersulfone ultrafiltration membrane base film. The preparation method comprises the following steps: preparing the polydopamine intermediate layer, anchoring oxidized haematococcus pluvialis polysaccharide, covalently cross-linking polyphenylated chitosan, coordination cross-linking iron ions, and post-treatment to obtain the ternary cross-linked nanofiltration membrane. The ternary cross-linked nanofiltration membrane is used for separating haematococcus pluvialis polysaccharide and astaxanthin ester. The ternary cross-linked functional layer simultaneously has three separation abilities of size screening, charge regulation and coordination selection, realizes selective separation of astaxanthin ester and neutral oil with similar molecular weights, and effectively retains macromolecular polysaccharide.