26results about How to "Prevent self-aggregation" patented technology

The invention designs and synthesizes a tetraphenyl ethylene covalent molecular cage with pyridine functionalization, and an AIE supermolecule photosensitizer is obtained through coordination and the synergistic effect of a subject and an object. The TPE unit enhances the photophysical properties of the photosensitizer and endows the photosensitizer with the AIE characteristic; the molecular cage and tetraphenylporphyrin are combined through a host and a guest, so that self-aggregation of porphyrin in water is further inhibited, ROS generation is promoted, and cancer cells are effectively killed through photocatalysis NADH oxidation assistance.

The invention discloses a preparation process of berberine hydrochloride, and belongs to the technical field of berberine production. The invention relates to a berberine hydrochloride preparation process, which comprises: S1, mixing a ferric sulfate-aluminum sulfate composite salt, sodium chloride, zinc chloride and anhydrous formic acid, pre-activating, adding N-2, 3-dimethoxybenzyl homopiperony lamine hydrochloride, dropwise adding a glyoxal mixed solution, and carrying out a reflux reaction. And S2, cooling the reaction liquid until a solid is separated out, filtering, adding a filter cake and diatomite into purified water, stirring, adjusting alkali, heating, and continuously stirring for 0.5-1 hour. Cooling and filtering, and reserving filtrate; s3, adjusting the acidity of the filtrate, cooling and growing crystals; and filtering, rinsing a filter cake, and carrying out vacuum drying on the filter cake to obtain berberine hydrochloride. The berberine hydrochloride prepared by the method is high in yield and purity, and the preparation process is safe, short in flow and friendly to human bodies and environment.

The invention belongs to the technical field of chemical production equipment, and particularly discloses an ultrasonic vibration device for preventing self-aggregation of a polymeric kettle stirring shaft, which comprises a polymeric kettle stirring shaft, a shaft sleeve is sleeved on the polymeric kettle stirring shaft, a mounting plate is arranged on the shaft sleeve, and a direct-current pipeline hydroelectric generator is mounted on the mounting plate. A voltage stabilization filtering module is installed on the portion, below the direct-current pipeline hydroelectric generator, of the installation plate, an ultrasonic vibrator head is installed on the portion, below the voltage stabilization filtering module, of the installation plate, the direct-current pipeline hydroelectric generator is connected with the voltage stabilization filtering module through a wire, and the voltage stabilization filtering module is connected with the ultrasonic vibrator head through a wire. The device is safe, stable, energy-saving, environment-friendly, simple in structure and easy to maintain, does not need an external power supply, and can be widely used for preventing self-polymerization of reaction materials on the stirring shaft of the polymerization kettle.

The invention discloses a control method for a methyl acrylate storage system and the storage system.The storage system comprises a liquid storage tank used for storing methyl acrylate; the gas supply unit is used for providing polymerization inhibition gas for the liquid storage tank inner body; and the control unit is used for controlling the storage system to work, and when the methyl acrylate liquid is stored in the liquid storage tank, the control unit controls the gas supply unit to continuously provide the polymerization inhibition gas. The methyl acrylate storage system has the beneficial effects that a set of storage system with the liquid storage tank is arranged, so that a supply manufacturer can transport methyl acrylate by adopting a tank car, secondary reshipment is not needed in the production and use process, the safety coefficient of materials in the storage and transportation process is improved, and the use cost is reduced; and polymerization inhibition gas is introduced into the liquid storage tank, so that self-polymerization of the methyl acrylate can be prevented, the storage system can store the methyl acrylate for a long time, meanwhile, the polymerization inhibition gas does not reduce the purity of the material, and the subsequent polymerization reaction rate is accelerated.

The application discloses a method for continuously preparing high-purity sulfolane, and belongs to the technical field of organic synthesis. By introducing a solvent and a stable free radical type polymerization inhibitor, the self-polymerization of butadiene is effectively inhibited. By adopting a cooling crystallization mode to remove sulfur dioxide, the thermal decomposition of sulfolene sulfone is avoided, high yield and high purity are realized, the service life of a hydrogenation catalyst is not affected, and the catalyst can be completely reused. The cooling crystallization also realizes the separation of the polymerization inhibitor and sulfolene sulfone. The polymerization inhibitor is dissolved in the solvent and recycled, and does not enter the hydrogenation system, so that the final sulfolane product has a purity of above 99.9% and has no chromaticity problem. The process saves energy consumption, the solvent has wide universality, operation is simple, the process is safe and environment-friendly, easy to scale up, and meets the green production requirements.

The invention relates to the technical field of medical instruments, in particular to a heparin coating based on material surface ammonification modification and a preparation method thereof, and the preparation method at least comprises the following steps: carrying out ultrasonic pretreatment on a base material with purified water, and drying for later use; the preparation method comprises the following steps: performing amination modification on a base material subjected to ultrasonic pretreatment by adopting an ammoniation reagent solution, and immersing the base material into a heparin solution to prepare the base material with a heparin coating on the surface. The surface of the material is subjected to amination modification by adopting a micromolecular ammoniation reagent and / or a macromolecular ammoniation reagent system, complex pretreatment such as plasma and ultraviolet rays does not need to be carried out on a base material, specific functional group activation does not need to be carried out on heparin, and the heparin is directly reacted after being subjected to ammoniation modification; the stable covalent grafted heparin anticoagulation coating can be formed, the anticoagulation time is prolonged, and the long-term implantation requirement is met.

The utility model provides a magnetic turning plate liquid level meter with an anti-self-gathering device, which comprises a liquid level meter body pipe, an upper connecting flange, a lower connecting flange, a magnetic turning plate indicator and a maglev, and the upper connecting flange and the lower connecting flange are respectively arranged on protruding connecting pipes at the bottom and the top of the side wall of the liquid level meter body pipe. A magnetic levitation element is arranged in a pipe body of the liquid level meter body pipe, a magnetic turning plate indicator is installed on the side wall of the liquid level meter body pipe, an anti-self-gathering device is arranged at the bottom of the liquid level meter body pipe, an impeller working pipe slightly smaller than the liquid level meter body pipe is additionally arranged on the lower portion of the liquid level meter body pipe, and a stirring impeller is installed in the impeller working pipe. And the lower part of the working pipe of the impeller is connected with a pipeline and a circulating pump, so that the liquid circularly enters the storage tank to be detected. A polymerization inhibitor injection point is added at the upper connecting flange, a polymerization inhibitor is mixed with liquid in the liquid level meter through stirring and then enters a storage tank through a circulating pipeline, a blind area of the liquid level meter is eliminated, and a measured medium is prevented from self-polymerization in the liquid level meter.

The invention discloses a polydopamine-modified boron nitride nanosheet / polyimide thermally conductive insulating composite film and a preparation method and application thereof. The preparation method comprises the following steps: adding a polydopamine-modified boron nitride nanosheet to a polyamic acid solution, stirring the reaction, and obtaining a polydopamine-modified boron nitride nanosheet / polyamic acid solution; using the polydopamine-modified boron nitride nanosheet / polyamic acid solution to prepare a polydopamine-modified boron nitride nanosheet / polyamic acid composite fiber felt; subjecting the polydopamine-modified boron nitride nanosheet / polyamic acid composite fiber felt to thermal imidization treatment to obtain a polydopamine-modified boron nitride nanosheet / polyimide thermally conductive composite fiber felt; and subjecting the polydopamine-modified boron nitride nanosheet / polyimide thermally conductive composite fiber felt to compression molding to obtain a polydopamine-modified boron nitride nanosheet / polyimide thermally conductive insulating composite film. The method is simple and reasonable in design, and the obtained film has good thermal conductivity.

The present application relates to a kind of methyl tetrahydrophthalic anhydride continuous production process and device, the present application adopts piperylene segmented feed, isoprene is first with a part of piperylene and maleic anhydride pre-synthesis reaction at low temperature, then continue to react with another part of piperylene at higher temperature, reduce isoprene self-polymerization, using column tube heat exchanger to improve synthesis efficiency, heater and mixer are set on external circulation pipeline to carry out temperature control to reactor, using the method that reactor synthesis product carries fresh raw material and circulates into reactor to prevent fresh carbon five and anhydride aggregation self-polymerization to reduce side reaction, no high polymer slag is generated.

The application relates to a CMP composition for obtaining a high-quality SiC single crystal substrate surface, which is prepared from the following raw materials in percentage by weight: 20-50 wt% of polishing abrasive, 3-5 wt% of oxidizing agent, 0.1-0.5 wt% of surfactant, 0.2-0.5 wt% of hydrogen bond regulator, 0.2-1 wt% of polishing accelerator, 0.01-0.05 wt% of defoaming agent, and the balance of water; the CMP composition is neutral. The CMP composition uses silicon oxide as the abrasive, introduces the hydrogen bond regulator, the polishing accelerator and the oxidizing agent, improves the polishing rate of the silicon carbide wafer CMP, realizes that the surface roughness Ra of the silicon surface after cleaning can reach below 0.07 nm, the surface after cleaning is free of large particles (>0.2 um), meanwhile, the silicon oxide raw material does not need to be treated, has excellent long-term storage stability, and the system does not have the phenomena of particle agglomeration and sedimentation with the prolongation of the storage time, and excellent polishing surface quality can be obtained in the subsequent polishing process.

The invention relates to the technical field of AP (ammonium perchlorate) modification, in particular to a preparation method of an ammonium perchlorate anti-moisture-absorption material coated with silicon dioxide based on double-silane synergistic modification through a wet method. Silicon dioxide is subjected to two-step synergistic modification through a long-chain alkylsilane modifier and a short-chain alkylsilane modifier; the preparation method comprises the following steps: modifying the surface by using long-chain silane, filling long-chain silane modified gaps by using short-chain alkyl to prepare modified nano silicon dioxide particles, and coating superfine AP particles with the modified nano silicon dioxide particles through wet modification, the modified nano silicon dioxide particles have enough steric hindrance and better hydrophobicity due to a three-dimensional structure on the surface, and the AP can be effectively prevented from being agglomerated after being coated with the modified nano silicon dioxide particles; the method is green and pollution-free, the process is simple, the comprehensive performance can be easily controlled through simple adjustment, the problem that the ultra-fine AP particles produced industrially are prone to moisture absorption and caking can be solved, and the application range of the ultra-fine AP particles in novel high-energy propellants is widened.

The invention provides a vacuum self-aggregation prevention ball valve, belongs to the technical field of valves, and solves the technical problem that a conveying medium in a valve is easy to enter an assembly gap to generate a self-aggregation phenomenon. Comprising a main valve body, an auxiliary valve body, a ball core and a valve seat, the main valve body and the auxiliary valve body are oppositely combined and connected to form a valve shell, the medium channel is provided with a spherical cavity section, annular diameter expanding sections are arranged on the two sides of the spherical cavity section respectively, and the valve seat is annular and installed on the annular diameter expanding sections. The ball core is also provided with a penetrating medium channel, a valve rod of the ball core penetrates out of the valve shell, a first sealing structure is arranged at the matching position, and the ball core is installed on the spherical cavity section and at least comprises a full-open state and a full-closed state. A second sealing structure is arranged on the mounting face of the valve seat and the annular expanding section, a third sealing structure in sliding contact with the ball core is arranged at the end, facing the ball core, of the valve seat, a containing cavity is formed between the ball core and the valve shell, and a communicating pipe is arranged outside the containing cavity and the valve shell. The valve has the technical effects of preventing a medium from entering an assembly gap to form a self-aggregation phenomenon and improving the operation stability of the valve.

The invention discloses a method for synthesizing 2-methylsuccinic acid from itaconic acid, which comprises the following steps: adding a solvent and itaconic acid into a high-pressure reaction kettle, adopting a modified Pd / C catalyst, controlling the hydrogenation temperature to be 80-100 DEG C, controlling the pressure to be 2-4 MPa, controlling the temperature to be 80-100 DEG C, and controlling the temperature to be 20-30 DEG C; keeping the temperature and the pressure until no raw material is left after hydrogen absorption; after the reaction is finished, filtering, and mechanically applying the modified Pd / C catalyst; and evaporating the filtrate to dryness to obtain the 2-methylsuccinic acid. The method has the advantages that itaconic acid can be used as a raw material, 2-methylsuccinic acid can be synthesized simply and conveniently with high selectivity, purification is not needed, the product purity is larger than or equal to 99.7%, and the yield is larger than or equal to 98%.

The invention relates to the field of outdoor materials, and particularly discloses a preparation method of a hydrophilic PVDF (polyvinylidene fluoride) membrane, which comprises the following steps: S1, carrying out acidolysis chain scission on native starch to refine into a small molecular starch chain, and then carrying out grafting reaction on the small molecular starch chain and a grafting monomer to obtain a starch grafting monomer; s2, the starch grafting monomer and PVDF are subjected to melt grafting modification, and PVDF grafting modified master batches are obtained; and S3, carrying out granulation modification on PVDF, PMMA, the PVDF grafted modified master batch and a plurality of auxiliary agents, and then carrying out tape casting to obtain the PVDF hydrophilic functional film. According to the invention, the grafting monomer and the starch are firstly modified, so that not only can hydrogen bonds among the starch be broken, but also the starch can be fixed on the grafting monomer, and then the grafting monomer is grafted to the main chain of the PVDF by adopting a melt extrusion grafting method, so that the hydrophilicity and the stability of the PVDF can be greatly improved. The problem of insufficient hydrophilicity of the PVDF membrane in the prior art is solved.

This invention provides a method for modifying inorganic powder, modified inorganic powder, and a carrier insulating film. The modification method includes the following steps: (1) drying the inorganic powder; (2) mixing a silane coupling agent with an alcohol solvent, adding deionized water while stirring, and continuing to stir to obtain a silane hydrolysate; (3) spraying the silane hydrolysate obtained in step (2) onto the inorganic powder obtained in step (1) while it is being stirred, heating, and stirring to react, thereby obtaining the modified inorganic powder. The modification method provided by this invention constructs a dense organic molecular layer on the surface of the inorganic powder that is chemically compatible with the resin matrix through a stepwise and controllable process, thereby significantly improving the dispersibility of the inorganic powder in the resin, reducing the viscosity of the slurry, and enhancing the dielectric properties and reliability of the final composite material.

The invention discloses a temperature control method for a high-performance carbon fiber precursor production efficient acrylonitrile recovery demonomerization tower, and belongs to the field of chemical equipment rectifying tower low-temperature control. Starting from actual production, acrylonitrile in the solution is recycled, the recycling efficiency reaches 99.95% or above, waste of acrylonitrile is avoided, pollution of acrylonitrile to the environment is reduced, the production cost is reduced, negative pressure operation is adopted on the tower top, the operation temperature is reduced, acrylonitrile self-polymerization is prevented, and energy is saved.

This invention relates to the field of semiconductor packaging materials technology, specifically disclosing a low-dielectric filler for packaging chips and its preparation method. The invention uses fluorosilicone-modified benzoxazine, fluorosilicone-modified alicyclic epoxy resin and dicyclopentadiene cyanate prepolymer crosslinking to form a low-viscosity polymer, and then adds low-dielectric filler F-mesoporous SiO2 and functional additives. The resulting low-dielectric filler has low viscosity, can fill ultrafine gaps well, and after curing, the filler has low volume shrinkage and good high-frequency dielectric properties.

This invention relates to a method for synthesizing polyether macromonomers for polycarboxylate superplasticizers with high double bond retention. The method uses methyl allyl alcohol as an initiator, potassium hydroxide as a catalyst, and propylene oxide (PO) and ethylene oxide (EO) as comonomers, synthesizing the polyether macromonomers for polycarboxylate superplasticizers via block copolymerization. The invention employs a zero-pressure + nitrogen-protected feeding process to effectively prevent EO molecules from colliding and self-polymerizing, thus reducing the double bond retention rate. The use of trace amounts of catalyst in the synthesis process avoids the damage to unsaturated double bonds caused by alkaline catalysts. Limiting the reaction pressure range reduces the number of EO molecules in the reactor per unit time, thereby reducing the probability of EO molecules colliding. Applying this polyether to superplasticizers can significantly improve their water reduction rate, improve the fluidity of cement paste, and enhance slump retention. The polyether macromonomers synthesized using this method have a double bond retention rate as high as 99%.

The present application is a kind of catalyst and process for preparing electronic grade propionic acid ester by hydrogenation of acrylic acid ester. The process uses activated carbon supported Ni-based catalyst, and one or two of Re, B or Ag as additives. The process is to mix acrylic acid ester containing trace amount of polymerization inhibitor or mixture with corresponding propionic acid ester with hydrogen and preheat into gas phase, then enter the fixed bed reactor containing catalyst to carry out gas phase reaction under very mild conditions, which avoids problems such as raw material self-polymerization and catalyst sintering, the catalyst can be stably operated for more than 2000 hours, the conversion rate of acrylic acid ester and the selectivity of propionic acid ester still maintain nearly 100%, which shows excellent stability, the purity of propionic acid ester in the reactor outlet sample can reach more than 99.6%, therefore, electronic grade propionic acid ester product can be obtained by simple rectification and molecular sieve dehydration treatment.

The invention discloses a high-molecular functional coating material, a high-molecular functional coating as well as a preparation method and application of the high-molecular functional coating material. The high-molecular functional coating material has the following structure: # imgabs0 #, wherein R comprises any one or a combination of more than two of a group containing a thioether structure, a group containing a sulfonium ion structure, a group containing a sulfoxide structure, a group containing a sulfone structure, a group containing a zwitter-ion structure and a group containing an oligo-ethylene glycol structure; n is any integer selected from 1-200; x and y represent the molar ratio of copolymerization units, x + y = 1, 0 < = x < 1, and 0 < y < = 1.

A multi-level structure hybrid supported atomic precision gold nanocluster catalyst and preparation method thereof. It belongs to the technical field of precious metal nanocatalysts. The catalyst expression is Au n / (M 2+ )Al‑LDH / rGO‑T, in which LDH nanosheets in the carrier grow vertically and staggered on both sides of rGO, where M 2+ Mg 2+ 、Ni 2+ 、Co 2+ Any one or two of the ions; Au n The Au nanoclusters are n=25, 38, and 127, which are highly dispersed at the edge of LDH nanosheets and at the interface between LDH and rGO. T represents the calcination temperature, which is 260-300°C. The captopril-protected Au n The nanoclusters are loaded on a hybrid support, and the ligands are removed by moderate calcination to obtain a catalyst. The advantage is that the obtained catalyst has a large specific surface area and more active sites. In the absence of an external base, the catalyst exhibits high activity and high selectivity in the solvent-free aerobic oxidation of benzyl alcohol to benzaldehyde.

The invention relates to the technical field of chemical lubricating base oil, in particular to polyester poly-alpha-olefin base oil as well as a preparation method and application thereof. The preparation method of the polyester poly-alpha-olefin base oil comprises the following steps: firstly, mixing dibutyl itaconate and an initiator to obtain a mixed solution; then, dropwise adding the mixed solution into alpha-olefin, and carrying out free radical addition polymerization reaction on carbon-carbon double bonds of dibutyl itaconate and carbon-carbon double bonds of alpha-olefin under the action of an initiator, so as to obtain the polyester poly-alpha-olefin base oil. The preparation method provided by the invention not only has the characteristics of mild reaction conditions, easiness in control, easily available raw materials, environmental protection and no pollution, but also effectively solves the problem that the quality of the existing polyester poly-alpha-olefin base oil is reduced due to self-polymerization of (methyl) acrylate, and the polyester poly-alpha-olefin base oil can be applied as the lubricating oil base oil.

This invention relates to the field of new chemical materials technology for hydraulic engineering, specifically to a fluorinated isocyanate, its preparation method, and its application. The method involves heating isocyanate and hexafluorobisphenol A under the action of a catalyst to carry out an addition reaction; the molar ratio of isocyanate groups in the isocyanate to the hydroxyl groups in hexafluorobisphenol A is greater than 1.7; the catalyst is an organotin catalyst, an organobismuth catalyst, or an organozinc catalyst. This method uses "hard-segment fluorination" to control the excess isocyanate and prevents explosive polymerization through staged feeding and strict temperature control, resulting in a homogeneous liquid product with low viscosity, high fluorine content, and both low surface energy and high mechanical strength. This method solves the problems of high water absorption rate in polyurea and high viscosity and embrittlement in fluorinated modified materials. The obtained product can be used to prepare fluorinated modified polyurea materials for surface water sealing, seepage prevention, and ice prevention in pumped storage power station dam panels, solving the technical problems of ice prevention, seepage prevention, and poor durability under harsh environments such as long-term water immersion in hydraulic engineering.

This invention relates to the field of solar cell technology, specifically to a hole transport layer containing betaine hydrochloride additive and its inverse wide-bandgap perovskite solar cell. The hole transport layer comprises a nickel oxide layer and a self-assembled molecular layer formed on its surface. The self-assembled molecular layer contains (4-(3,6-dimethyl-9H-carbazole-9-yl)butyl)phosphonic acid and betaine hydrochloride. The introduction of betaine hydrochloride improves the conductivity of the hole transport layer through the interaction of its carboxylic acid groups with nickel oxide, and inhibits its clustering behavior through interaction with the self-assembled molecules, thereby improving film uniformity and effectively passivating buried interface defects in the perovskite light-absorbing layer. The inverse wide-bandgap perovskite solar cell fabricated based on this hole transport layer exhibits significantly improved open-circuit voltage and fill factor, ultimately achieving a photoelectric conversion efficiency exceeding 21.7%. This invention provides an effective interface engineering strategy for fabricating efficient and stable wide-bandgap perovskite solar cells and tandem devices.

The present invention discloses a method for enhancing the separation of agricultural and forestry biomass by using a solvent co-enhancing agent and for self-assembling lignin nanospheres / bottles in situ, and belongs to the technical field of biomass refining and preparation of degradable polymer nanomaterials. The present invention provides a new CELF method for separating agricultural and forestry biomass, and uses a solvent system composed of tetrahydrofuran and an aqueous sodium carbonate solution to preferentially solvate hemicellulose and lignin, components of agricultural and forestry biomass, under mild conditions, to efficiently separate components of lignocellulosic biomass; and then self-assembles the lignin-containing solution in situ into lignin micro-nanospheres / bottles, and finally realizes separation and micro-nano integration. The lignin nanospheres / bottles prepared by the present invention make the process of preparing lignin nanospheres / bottles simple and energy-efficient, and there is no need to separate lignin solids.

The invention discloses an underwater self-repairing high-tensile elastomer and a preparation method thereof, and belongs to the field of elastomer preparation. The invention aims to solve the problems that an existing self-repairing material cannot realize efficient self-healing in a severe underwater environment, and the mechanical property of the material cannot be enhanced while the self-repairing efficiency and the tensile rate of the material cannot be maintained. The invention relates to an underwater self-repairing high-tensile elastomer, which is prepared from methyl methacrylate, ethyl acrylate and ethyl cellulose esterified by n-butyric acid. The method comprises the following steps: 1, preparing ethyl cellulose esterified by n-butyric acid; 2, mixing methyl methacrylate and ethyl acrylate; 3, adding ethyl cellulose subjected to n-butyric acid esterification and dissolving; and 4, ultraviolet curing. The invention is used for the underwater self-repairing high-tensile elastomer and the preparation thereof.