197 results about "Chemical preparation" patented technology

The invention relates to composition and preparation of a thick-film copper conductor sintered at different temperatures and different atmospheres, and belongs to the field of chemical preparation. Comprising the following steps: mixing 65-85% of copper powder, 3.0%-15.0% of glass, 15.0%-35.0% of an organic adhesive and 0.1-1.5% of an additive which is one or more of titanium trioxide or stannous oxide, cuprous oxide and copper oxide, rolling into slurry, and sintering at 850-950 DEG C under the protection of nitrogen or ammonia gas to obtain a copper conductor. The medium-temperature copper paste is prepared by the following steps: mixing 60.0-85.0% of copper powder, 3.0-13.0% of glass, 8.0-25.0% of an organic adhesive and 0.2-1.6% of an additive which is one or more of titanium sesquioxide or stannous oxide, cuprous oxide and copper oxide, rolling into paste, and sintering at 450-650 DEG C under the protection of nitrogen or ammonia gas to obtain a copper conductor. The low-temperature copper paste is prepared by mixing 60.0-85.0% of copper powder, 3.0-13.0% of glass, 8.0-25.0% of an organic binder and 0.1-2.0% of an additive which can be one or more of elemental elements of magnesium, zinc, boron and phosphorus or one or more of nickel phosphide, nickel boride, copper phosphide and copper oxide, rolling the mixture into paste, and sintering the paste in air at 250-350 DEG C to obtain a copper conductor.

The invention discloses a hexamethyldisiloxane preparation method capable of purifying a raw material, and relates to the technical field of chemical preparation, the hexamethyldisiloxane preparation method capable of purifying the raw material comprises the following steps: S1, raw material preparation: cooling deionized water through a cooling system, and maintaining the temperature to be less than or equal to 10 DEG C, then injecting part of the cooled deionized water into a tubular reactor, pumping trimethylchlorosilane and methylbenzene into a premixing tank according to a proportion, and uniformly stirring and mixing; s2, catalytic promotion: injecting diluted hydrochloric acid into the tubular reactor, uniformly mixing the diluted hydrochloric acid with deionized water, and maintaining the pH value to 2-3; according to the hexamethyldisiloxane preparation method capable of purifying the raw materials, redundant steps such as catalyst recovery and repeated washing can be omitted through the hydrolysis reaction, the method is suitable for continuous production, meanwhile, the process of the hydrolysis reaction is optimized by changing the use steps and the input method of the deionized water, and the stability in the preparation process is further maintained.

The invention discloses a molten salt dielectric heat conduction chemical preparation method of a flat wood carbon electrode substrate material, a wood carbon electrode precursor is covered with molten salt, the molten salt dielectric heat conduction chemical synthesis is carried out according to the heating-heat preservation-cooling process, and the molten salt is a mixture formed by mixing inert molten salt and active molten salt; and removing condensed fused salt on the surface of the synthetic product, polishing the surface, and drying to obtain the wood carbon electrode substrate material. According to the preparation method, the problems of high cost, high energy consumption, narrow application range and the like in preparation of a high-performance plate electrode substrate carbon material aiming at integral wood with a specific size are solved, and the self-supporting electrode material substrate which is low in cost, has a hierarchical pore structure and has comprehensive performance is obtained. The obtained wood carbon electrode substrate material can be used as a plate electrode substrate carbon material; alternatively, a high surface capacitance plate electrode is directly used for capacitive deionization or supercapacitors.

The invention discloses a silicon dioxide anti-blocking agent and a preparation method thereof, and relates to the technical field of chemical preparation. Comprising the following steps: taking a water glass solution and a dilute sulphuric acid solution as raw materials, and carrying out parallel flow mixing reaction to prepare silica gel; the method comprises the following steps: crushing silica gel, transferring the crushed silica gel into a reaction kettle, adding an aprotic organic solvent, adding a pH buffer solution and organic alkali into the reaction kettle to adjust the pH value of the solution, carrying out heating reflux to carry out an aging reaction, stopping heating after the reaction is completed, opening a filter valve, and filtering the liquid into an alkaline recovery tank; continuously adding an aprotic organic solvent and an organic acid acidification system into the reaction kettle to adjust the pH value of the solution, aging, opening a filter valve to filter the liquid into an acidic recovery tank, washing gel to be neutral, and filtering washing water into a water recovery tank; and adding high-purity water into the reaction kettle, homogenizing and emulsifying to prepare slurry, drying and crushing to obtain the silicon dioxide anti-blocking agent product. The preparation cost is reasonable, the treatment method is simple, and the obtained product is fine and smooth in hand feeling, high in transparency and high in yield.

The invention belongs to the technical field of chemical preparation of nano-porous materials, and relates to core-shell type porous silicon dioxide microspheres, a preparation method thereof and application of the core-shell type porous silicon dioxide microspheres in structural color. The preparation method comprises the following steps: (1) mixing absolute ethyl alcohol, ammonia water and deionized water to obtain alkaline hydrolysate; (2) mixing tetraethyl orthosilicate with organosilane to obtain a silane mixed solution; (3) simultaneously and respectively dropwise adding the alkaline hydrolysate and the silane mixed liquid into the silicon dioxide microsphere dispersion liquid under stirring, and reacting to obtain an intermediate; and (4) calcining the obtained intermediate at 550-650 DEG C to obtain the core-shell type porous silicon dioxide microspheres. The preparation method of the core-shell type porous silicon dioxide microspheres is simple, easy to operate and mild in condition. The raw materials are simple, easy to obtain, non-toxic and harmless, a surfactant and a template agent are not needed, and the cost is greatly reduced.

The invention provides a zinc negative electrode with a composite interface structure and an ultrasonic chemical preparation method and application thereof, and belongs to the technical field of zinc-based batteries. According to the sonochemical preparation method of the zinc negative electrode with the composite interface structure, the zinc substrate is placed in the oxidizing solution to be subjected to the oxidation-reduction reaction under the ultrasonic condition, the cavitation effect generated by ultrasound can greatly activate electrolyte salt, the mass transfer process is enhanced, and the electrochemical performance of the zinc negative electrode is improved. And a chemical reaction which is difficult to occur or is slowly carried out under a conventional condition is excited, and a composite interface structure consisting of two or more metal elementary substances and / or compounds is formed on the surface of the zinc matrix, so that the interface stability of the zinc negative electrode is improved, and the cycle life of the zinc-based battery is prolonged.

The invention discloses an intelligent self-adaptive chemical preparation batching method and batching system, and relates to the technical field of chemical preparation production. The method comprises the following steps: monitoring the properties of various raw materials in real time, and generating multi-source data marked with timestamps; s2, performing space-time alignment on the multi-source data generated in the step S1 by adopting Kalman filtering and wavelet transform, and fusing and outputting comprehensive property parameters of the raw materials through a BP (Back Propagation) neural network; based on a reinforcement learning DQN algorithm, taking the raw material property parameters as a state space, taking the flow adjustment amount as an action space, and dynamically generating a correction ratio; and executing the proportioning instruction to detect the product quality on line and generate a quality report. The system comprises a raw material monitoring module, a data fusion processing unit, a dynamic formula engine module, an execution control module and an online quality detection module. Raw material properties are monitored in real time through various sensors, the proportion is dynamically corrected, online quality detection is integrated, and batch consistency control is achieved.

The invention discloses a synthesis method of an organosilicon polyurethane fluoride-free waterproof agent, which belongs to the technical field of chemical preparation, and is prepared by adopting organosilicon as a main body to react with diisocyanate and acrylate monomers, carrying out chain extension by using a special double-bond chain extender and then adding various assistants. Organic silicon is a low-surface-energy substance and has a good water-repellent effect, a large number of siloxane bonds exist in the organic silicon, bond angles of the siloxane bonds are large, and methyl connected to silicon atoms can freely rotate. After use, the fabric has a good waterproof effect and a soft hand feeling; after the fluorine-free waterproof agent with the branched structure is used, a certain rough texture can be formed on the fabric, the surface roughness can influence the contact angle of liquid drops on the fabric, the nano lotus effect is realized, and the fabric has an excellent waterproof effect; the cationic waterborne polyurethane can be well combined with fabrics with negative charges, so that the waterproof agent is better in washability.

The invention discloses a preparation method of an electronic-grade hydroxylamine aqueous solution, and relates to the field of chemical preparation. The preparation method comprises the following steps: reacting electronic-grade ammonia water or organic alkali with electronic-grade hydroxylamine salt to generate a hydroxylamine aqueous solution; and after the reaction, separating through a POSS (Polyhedral Oligomeric Silsesquioxane) nano blending modified membrane, and removing salt, impurities and unreacted raw materials to obtain a high-purity hydroxylamine aqueous solution. And concentrating the solution into a 50% hydroxylamine aqueous solution by adopting a low-temperature vacuum concentration technology. The method can effectively remove metal ions and inorganic impurities, and ensures that the final product is high in purity and meets the electronic grade requirement.

The application relates to the technical field of chemical preparation, and particularly relates to a liquid monoammonium phosphate and iron phosphate production system. The system comprises a mother liquor treatment device, a pH adjusting tank, a purified phosphoric acid storage tank, a liquid monoammonium phosphate storage tank and an iron phosphate production device; the output end of the mother liquor treatment device is connected with the first input end of the pH adjusting tank, the output end of the purified phosphoric acid storage tank is connected with the second input end of the pH adjusting tank, and the purified phosphoric acid and the mother liquor to be adjusted are injected into the pH adjusting tank; the mixed reaction area of the pH adjusting tank is configured to neutralize the mother liquor to be adjusted and the purified phosphoric acid according to a preset ratio to generate liquid monoammonium phosphate; the input end of the liquid monoammonium phosphate storage tank is connected with the output end of the pH adjusting tank, the output end of the liquid monoammonium phosphate storage tank is connected with the raw material inlet of the iron phosphate production device, and the iron phosphate production device is configured to synthesize iron phosphate by taking the liquid monoammonium phosphate as a raw material. The application has the beneficial effects of simplifying a production process and reducing energy consumption.

The utility model discloses a kind of purification equipment of self-cleaning type sedimentation treatment, belong to chemical preparation technical field, including shunting discharge shell, further including self-cleaning type washing device and multifunctional discharge device, self-cleaning type washing device and multifunctional discharge device for washing purification of sediment are installed on the shunting discharge shell, multifunctional discharge device upper end is connected with self-cleaning type washing device;The multifunctional discharge device includes rotatable discharge component for cooperating self-cleaning type washing device changes discharge path and driving component for providing drive, rotatable discharge component is connected with shunting discharge shell, driving component and self-cleaning type washing device, driving component is connected with shunting discharge shell.By the above-mentioned mode, rotatable discharge component is rotated and adjusted by driving component drive, so that filtered wastewater, sediment and self-cleaning wastewater effectively shunt, improve the purification effect, reduce the influence of sediment impurity on filtration effect.

The invention relates to the technical field of chemical preparation, and discloses a preparation method of a glucolactone crystal with controllable product granularity, which comprises the following steps: carrying out ultrasonic induced nucleation on a gluconic acid concentrated solution to generate a seed crystal, then cooling to 40-50 DEG C at a cooling rate of 0.5-1.5 DEG C / h, stirring by adopting a Taylor flow stirrer while cooling, and then cooling to 40-50 DEG C at a cooling rate of 0.5-1.5 DEG C / h to obtain the glucolactone crystal with controllable product granularity. A 45-degree four-blade axial Taylor flow stirring paddle is assembled below the Taylor flow stirrer, the rotating speed is 200-400 rpm, the ratio of the diameter of the Taylor flow stirring paddle to the inner diameter of the crystallizer is 0.4-0.8, after the cooling procedure is completed, solid-liquid separation is conducted, crystals are collected, and a glucolactone crystal product is obtained after drying treatment. The number of fine grains is controlled by changing the ratio of the diameter of the Taylor flow stirring paddle to the inner diameter of the crystallizer and the stirring speed, glucolactone crystal products with different granularities are obtained, the process is stable, the granularity of the glucolactone crystals can be effectively controlled, and the granularity of the crystal products can be finely adjusted according to actual product requirements.

The invention relates to the technical field of chemical preparation, and discloses a preparation method of a phthalimide compound, which comprises the following steps: S1, raw material mixing: sequentially adding phthalic anhydride, a primary amine compound, p-toluenesulfonic acid and phosphorus pentoxide into a reaction container with a stirring device and a temperature control module, and stirring for 1-2 hours; adding ethanol as a solvent, and carrying out a stirring reaction; s2, curing: cooling the reaction liquid to 20-25 DEG C, slowly adding deionized water into the reaction liquid while stirring, standing, and separating out a solid product; a traditional dehydrating agent is changed into a low-cost green dehydrating agent combination, so that the cost loss is reduced, the stimulation effect is reduced, the catalytic activity is equivalent to that of p-toluenesulfonic acid by adding a new sulfonic group functional polymer, but the problems of volatility of liquid acid and equipment corrosion are avoided, a low-toxicity and low-cost solvent of ethanol is added, the toxicity is reduced, and the environment-friendly dehydrating agent is prepared. The preparation is safer, the cost is lower, and the applicability is wider.

The present application belongs to the technical field of daily chemical preparation, and particularly relates to a gynecological gel for inhibiting bacteria, regulating microecological balance and tightening vagina and a preparation method thereof. The gynecological gel comprises the following raw materials in mass fractions: 0.5-1 parts of carbomer, 0.04-0.09 parts of sodium hydroxide, 1-3 parts of collagen, 0.01-0.06 parts of sodium hyaluronate, 0.5-1.5 parts of isomaltooligosaccharide, 2-5 parts of propylene glycol, 0.05-0.3 parts of hydroxybenzoic acid methyl ester, 0.02-0.15 parts of hydroxyphenyl ethyl ester, 0.1-1.5 parts of hydrogenated lecithin, 1-6 parts of 1,3-butanediol, 3-5 parts of glycerol, 0.5-1 part of xanthan gum and 70-90 parts of water. The present application uses buckwheat filtrate to prepare collagen, and the active ingredients in the buckwheat filtrate can penetrate the cell membrane of pathogenic bacteria to play an antibacterial role; the collagen can repair the vaginal mucosa barrier and reduce the adhesion and invasion of pathogenic bacteria; therefore, after being compounded with the raw materials such as carbomer, sodium hydroxide, sodium hyaluronate, isomaltooligosaccharide and propylene glycol, the multiple components can synergistically promote the synthesis and repair of collagen fibers and improve the elasticity of tissues.

This invention discloses a chemical preparation method for pharmaceutical-grade dexborneol. The method employs Noyori asymmetric hydrogenation, asymmetric reduction of camphor, and the use of ruthenium as a catalyst. Under the action of phosphine ligands, dexborneol and a small amount of its isomer, isoborneol, are prepared. Then, under the action of trimethylchlorosilane, dexborneol, due to its spatial configuration, can form a silicon-oxygen bond with TMS, while isoborneol cannot. Isoborneol is removed by recrystallization to obtain a silyl ether protected compound of dexborneol. Dexborneol is then prepared under hydrochloric acid conditions and purified by recrystallization to obtain highly purified dexborneol. This route features mild reaction conditions, does not use highly toxic materials, and has a high yield, meeting the requirements for pharmaceutical-grade dexborneol.

The invention discloses a cinnamyl aldehyde derivative-based 1-hydroxy-1-sodium sulfonate structural compound as well as a preparation method and application thereof, and belongs to the technical field of preparation of agricultural chemicals. The structural general formula of the compound is shown as a formula (I). The preparation method of the compound comprises the following steps: dropwise adding a homogeneous phase B system consisting of sodium hydrogen sulfite, a quaternary phosphonium salt phase transfer catalyst and water into a homogeneous phase A system consisting of a compound shown in a formula (II) and an organic solvent, and carrying out nucleophilic addition reaction to obtain the compound shown in the formula (I). The preparation method is simple, reaction conditions are mild, and the obtained compound is good in environmental compatibility, has high biological activity on soil pathogens (bacteria, fungi, root-knot nematode and the like), can be widely applied to prevention and treatment of soil-borne diseases, and provides material guarantee for safe production of crops.

This application relates to a method for preparing melitracen hydrochloride intermediates, belonging to the field of chemical preparation. The preparation method includes the following steps: dissolving 3,3-dimethyl-2-benzofuran-1(3H)-one in an organic solvent, adding a catalyst and heating the reaction, followed by purification after the reaction to obtain 10,10-dimethylanthrone. The catalyst includes at least one selected from ferric chloride, ferrous chloride, zinc chloride, and anhydrous aluminum trichloride; the organic solvent includes benzene. This preparation method has not been reported in the literature, significantly shortens the process flow for synthesizing melitracen intermediates, avoids the use of concentrated sulfuric acid, reduces waste, and saves costs.

The invention belongs to the field of preparation of water treatment chemicals, particularly relates to a method for preparing a high-performance polyaluminum chloride water purifying agent through waste acid-polymerization coupling, and aims at solving the problems that a product is unstable, the impurity content is high, and the waste residue amount is large. The method comprises the following steps: performing oxidation impurity removal pretreatment on industrial waste hydrochloric acid; synthesizing a polyaluminum chloride solution in a medium polymerization state aluminum form as a seed crystal by adopting an aluminum source raw material under the condition of controlling proper basicity; mixing the pretreated waste acid with medium-polymerization-state aluminum seed crystals, pumping the mixture into an inorganic ceramic membrane coupling reactor for polymerization reaction, and promoting the hydrolytic polymerization reaction balance of aluminum to move towards the direction of generating high-polymerization-degree aluminum seeds through the separation effect of a ceramic membrane; after the reaction is completed, the solution is purified and separated through a nanofiltration membrane system, the intercepted liquid is the high-performance polyaluminum chloride water purifying agent, and the permeated liquid is a salt solution containing sodium chloride and the like which can be recycled. The method fully utilizes industrial waste acid to prepare polyaluminum chloride, and has obvious environmental protection benefits and application values.

The invention provides damp-heat-resistant flame-retardant polyurethane and a host-guest chemical preparation method thereof, hyperbranched polyethyleneimine reacts with aldehydes to obtain a Schiff base structure, and then an organic hydrogen phosphate compound reacts with the Schiff base structure to synthesize a phosphorus-containing hydrophobic shell-hydrophilic core hyperbranched polymer. A phosphate flame retardant is embedded in the obtained amphiphilic hyperbranched flame-retardant polymer to form a flame-retardant complex by utilizing a host-guest coated hydrophilic-hydrophobic interaction principle, and the complex is blended with polyurethane to obtain a modified polyurethane material. The modified polyurethane can effectively inhibit precipitation of phosphate flame retardants, so that the material has excellent flame retardance and humidity and heat resistance, and a flame-retardant complex of the flame-retardant polyurethane has good compatibility with the polyurethane, so that the material has good transparency.

The invention belongs to the field of pharmaceutical chemistry preparation, discloses a preparation method of 6-amidino-2-naphthols and its intermediate M1, and prepares nafamostat mesylate using the method. The preparation method provided by the present invention is: using SM1 as starting material, and obtaining intermediate M1 by hydroxylamine addition, M1 is reduced to obtain 6-amidino-2-naphthols M2 by means of continuous reaction or stepwise reaction, condensed under the action of a condensing agent, and then methanesulfonic acid salifies to obtain nafamostat mesylate. The preparation method of the present invention has short reaction time, high yield, high product purity, mild reaction conditions, simple post-processing, avoids the dangerous reaction, dangerous reagent, controlled reagent involved in traditional route, therefore the safety of operation and product is higher, is conducive to industrialized large-scale production.

The invention relates to the technical field of chemical preparation, and discloses a process for preparing lithium sulfide through hydrogenation of dimethyl disulfide or di-tert-butyl polysulfide, which comprises the following steps: preparation of hydrogen sulfide: in a first reactor, carrying out hydrogenation reaction on an organic sulfur source and hydrogen in the presence of a hydrogenation catalyst to generate hydrogen sulfide mixed gas; the organic sulfur source is dimethyl disulfide or di-tert-butyl polysulfide; synthesis of lithium sulfide: introducing the hydrogen sulfide mixed gas into a second reactor filled with lithium source slurry for reaction to generate lithium sulfide; the lithium source slurry comprises a lithium source and a cosolvent; the lithium source is lithium hydroxide or lithium carbonate. A two-step process of hydrogen sulfide preparation and lithium sulfide synthesis separation is adopted, hydrogen sulfide is prepared by hydrogenation of an organic sulfur source in the first reactor and then conveyed to the second reactor to participate in synthesis, high-purity lithium sulfide is obtained through the scheme, and the content of polysulfide is extremely low.

The invention relates to the technical field of chemical preparation, in particular to a preparation method of gamma-thiocyano propyl triethoxy silane, which comprises the following steps: adding acetonitrile and tetrabutyl ammonium thiocyanate into a reaction container, dropwise adding 3-chloropropyl triethoxy silane into a four-mouth round-bottom flask while stirring, and controlling the dropwise adding time; the preparation method comprises the following steps: heating to 30-40 DEG C, reacting for 1.5-3 hours, cooling to room temperature, adding an ice-saturated sodium chloride solution into a reaction container to obtain a mixed solution, extracting the mixed solution, taking an organic layer, sequentially washing, drying and filtering, and respectively carrying out vacuum concentration and vacuum rectification on filtrate to obtain the gamma-thiocyano propyl triethoxy silane. The preparation method of the gamma-thiocyano propyl triethoxy silane provided by the invention is carried out under an anhydrous condition, so that hydrolysis and condensation side reactions of silane caused by a water-phase synthesis method are effectively avoided, meanwhile, the generation of irritant gases such as hydrogen sulfide and the like is avoided, and the preparation method is safer to operate, environment-friendly and more suitable for industrial popularization.

This invention provides a sampling and testing device for chemical preparation production, relating to the field of sampling and testing technology. The device includes a base with a top plate on top. Two symmetrically distributed support shafts are fixed to the top of the base to support the top plate. Two support disks are located on opposite sides of the two support shafts. Each support disk has multiple annularly distributed placement slots, and each slot contains a test tube. The device allows for convenient and quick dispensing of sample solutions into multiple test tubes for each test group, as well as simultaneous agitation and mixing, accelerating the mixing rate of the sample solution and the testing reagent. This eliminates the need for manual shaking by the testing personnel, reducing their workload and improving their efficiency. Furthermore, the alternating use of the two support disks allows for convenient placement of test tubes required for different test items.

The application relates to the technical field of chemical preparation, and discloses a hydrogen peroxide production system, which comprises an organic solvent tank, a solid carrier storage tank, a dosing tank, a stirring kettle and a concentration detection device; the organic solvent tank is mechanically connected with the stirring kettle through a first valve, the solid carrier storage tank is mechanically connected with the stirring kettle through a second valve, the dosing tank is mechanically connected with the stirring kettle through a third valve, the concentration detection device is arranged in the cavity of the stirring kettle, and the concentration detection device is in communication connection with the third valve. The application can accurately control the proportion of various materials, so that the hydrogen peroxide production efficiency is higher, and the concentration is more accurate.

The invention discloses a chemical preparation process for modifying waste glass to replace cement mortar fine aggregate, and solves the problems that when the existing waste glass fine aggregate is used for lining mortar, the interfacial compatibility is poor, the high salt-sewage synergistic corrosion resistance is weak, and the lining mortar is easily damaged by dry-wet alternation and sewage scouring. The method comprises the following steps: a pretreatment stage: crushing waste glass, dispersing with an EDTA-2NaCa aqueous solution, drying to obtain surface activated glass fine aggregate, and synchronously preparing premixed slurry containing a maleic anhydride cross-linked modified soybean protein-pectin compound and alkaline leaching modified lithium iron phosphate residues; in the modification preparation stage, cement hydration is started firstly, then the premixed slurry and the modified bismuth system-MnO2 composite photocatalytic waste optical fiber preform glass powder are added, and finally the surface activated glass fine aggregate is mixed to be stirred and formed. According to the process, the interface bonding strength, corrosion resistance, scouring resistance and ASR resistance can be improved, waste glass solid waste recycling is facilitated, and the prepared fine aggregate adapts to the working condition of a coastal underground blow-off pipeline and can be used for preparing high-performance lining mortar.

The application discloses a kind of nano herbicide and preparation method thereof, which belongs to the technical field of agricultural chemicals preparation.The preparation method is to process non-water-soluble herbicide technical material, quaternary ammonium salt, alkaline compound, solvent and other additives by stirring and dispersing to prepare nano water agent.The preparation process of the application is simple, green and environmentally friendly.Compared with traditional dosage forms, the obtained nano preparation improves the herbicidal effect and safety of herbicides, reduces energy consumption, material resources during production process, reduces dosage, reduces the impact on agricultural environment and non-target organisms due to large-scale use of pesticides, achieves the purpose of increasing yield and income, and provides protection for safe production of crops.

The invention provides a method for slicing anionic polymerization fiber-grade nylon 6, and belongs to the technical field of chemical preparation. The method comprises the following steps: respectively pouring materials into corresponding reactors, heating, carrying out vacuum dehydration, feeding into a mixing reactor, heating, melting, stirring and devolatilizing after the reaction is completed, and drafting the melt to prepare slices. The technological process is simple, the product quality is stable, the relative viscosity of the obtained nylon 6 slices is 2.8-3.1, the molecular weight distribution is 1.8-2.0, the conversion rate is 98%, and the nylon 6 slices can be directly used for melt spinning without aftertreatment, so that the anionic polymerization nylon 6 breaks through the traditional casting molding field and can be applied to various melt processing environments.

The invention relates to the technical field of chemical preparation, and provides a method and system for preparing a humic acid compound fertilizer based on caprolactam byproduct APU oil, and the method comprises the following steps: carrying out a catalytic oxidation reaction on the caprolactam byproduct APU oil and an immobilized FeOCl catalyst under an aerobic condition to generate an active intermediate; carrying out condensation reaction on the active intermediate under an anoxic condition to generate a humic acid-like substance; and carrying out post-treatment on the humic acid-like substance to obtain the humic acid compound fertilizer. According to the scheme, the caprolactam byproduct APU oil is converted into the humic acid compound fertilizer which is high in organic matter content and good in soil improvement effect through catalytic oxidation and condensation reaction, resource utilization of industrial byproducts is achieved, and the production cost of the fertilizer is reduced. Moreover, the immobilized FeOCl catalyst is selected as the catalyst, on one hand, secondary pollution of a liquid-phase catalyst is avoided, and on the other hand, carbon and nitrogen elements in the caprolactam byproduct APU oil can be efficiently converted into humus and nutrients, so that the environmental protection property of the whole process is ensured from the source.

The present application relates to the technical field of chemical preparations, in particular to a method for improving the bioavailability of astaxanthin in phaffia rhodozyma powder and application. The present application uses composite enzymes to pretreat phaffia rhodozyma powder, so that astaxanthin is fully released from the cells, and then specially-made eutectic solvent is used to efficiently extract the pretreated phaffia rhodozyma powder, and the extraction rate can reach more than 90%. The astaxanthin extract prepared by the present application has high antioxidant activity and high bioavailability, and the DPPH free radical scavenging rate can be up to 89.14%, the ABTS free radical scavenging rate can be up to 90.09%, and the bioavailability can be up to 81.41%. In addition, the present application is simple to operate, does not need ultrasonic, microwave and other assisted methods, has low requirements on equipment, can be suitable for industrial large-scale production, provides a feasible scheme for the green and efficient extraction of astaxanthin, and has a wide application prospect in the food, cosmetic and feed industries.

The invention belongs to the technical field of gas sensing, and discloses a preparation method of an indium oxide gas-sensitive material based on a bamboo biological template, which comprises the following steps: taking natural bamboo as a biological structure template, introducing an indium source precursor into a template pore channel by a solution impregnation method, drying, and carrying out high-temperature calcination in an air atmosphere. According to the heat treatment process, thermal degradation and removal of the biological template are achieved, decomposition and oxidation of the precursor are synchronously induced, and finally the indium oxide material with the bamboo biological form and the high specific surface area is generated. The obtained material shows high response and recovery speed to nitrogen dioxide gas, the response value exceeds three thousand, meanwhile, precious metal and a traditional chemical preparation method do not need to be used in the preparation process, and the green chemical concept of saving energy and reducing pollution is achieved.